[PATCH] Change some arguments to gdb::string_view instead of name+len

[PATCH] Change some arguments to gdb::string_view instead of name+len

[Christian Biesinger via gdb-patches]

Just some code cleanup. This change has a few benefits:
- Shorter argument list in the functions
- If the caller needs to calculate the string, they no longer
  need to explicitly call strlen
- It is easy to pass std::string to this (done in one place
  currently)

This also updates a couple of places that were passing 0/1 to
a bool parameter.

gdb/ChangeLog:

2019-09-29  Christian Biesinger  <cbiesinger@google.com>

	* coffread.c (record_minimal_symbol): Update.
	(process_coff_symbol): Update.
	* dbxread.c (read_dbx_symtab): Update.
	* dwarf2read.c (add_partial_symbol): Update.
	(fixup_go_packaging): Update.
	(load_partial_dies): Update.
	(new_symbol): Update.
	* elfread.c (record_minimal_symbol): Update.
	* mdebugread.c (parse_partial_symbols): Update.
	(handle_psymbol_enumerators): Update.
	(new_symbol): Update.
	* minsyms.c (minimal_symbol_reader::record_full): Change signature
	to use gdb::string_view instead of name+len.
	* minsyms.h (class minimal_symbol_reader) <record_full>: Likewise.
	* psympriv.h (add_psymbol_to_list): Likewise.
	* psymtab.c (add_psymbol_to_bcache): Likewise.
	(add_psymbol_to_list): Likewise.
	* stabsread.c (define_symbol): Update.
	* symtab.c (symbol_set_names): Change signature to use gdb::string_view.
	* symtab.h (SYMBOL_SET_NAMES): Likewise.
	(symbol_set_names): Likewise.
	* xcoffread.c (scan_xcoff_symtab): Update.
---
 gdb/coffread.c   |  5 ++-
 gdb/dbxread.c    | 24 +++++++--------
 gdb/dwarf2read.c | 29 +++++++++---------
 gdb/elfread.c    |  4 +--
 gdb/mdebugread.c | 80 ++++++++++++++++++++++++++----------------------
 gdb/minsyms.c    | 16 +++++-----
 gdb/minsyms.h    | 10 +++---
 gdb/psympriv.h   |  3 +-
 gdb/psymtab.c    |  8 ++---
 gdb/stabsread.c  |  5 +--
 gdb/symtab.c     | 26 ++++++++--------
 gdb/symtab.h     |  7 +++--
 gdb/xcoffread.c  | 42 +++++++++++++++----------
 13 files changed, 136 insertions(+), 123 deletions(-)

diff --git a/gdb/coffread.c b/gdb/coffread.c
index c44b69069e4..52b9c57b9cc 100644
--- a/gdb/coffread.c
+++ b/gdb/coffread.c
@@ -462,8 +462,7 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       return NULL;
     }
 
-  return reader.record_full (cs->c_name, strlen (cs->c_name), true, address,
-			     type, section);
+  return reader.record_full (cs->c_name, true, address, type, section);
 }
 \f
 /* coff_symfile_init ()
@@ -1569,7 +1568,7 @@ process_coff_symbol (struct coff_symbol *cs,
   name = EXTERNAL_NAME (name, objfile->obfd);
   SYMBOL_SET_LANGUAGE (sym, get_current_subfile ()->language,
 		       &objfile->objfile_obstack);
-  SYMBOL_SET_NAMES (sym, name, strlen (name), 1, objfile);
+  SYMBOL_SET_NAMES (sym, name, true, objfile);
 
   /* default assumptions */
   SYMBOL_VALUE (sym) = cs->c_value;
diff --git a/gdb/dbxread.c b/gdb/dbxread.c
index 564c5d3a414..16727ef1083 100644
--- a/gdb/dbxread.c
+++ b/gdb/dbxread.c
@@ -1464,7 +1464,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	      if (gdbarch_static_transform_name_p (gdbarch))
 		gdbarch_static_transform_name (gdbarch, namestring);
 
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_STATIC,
 				   data_sect_index,
 				   psymbol_placement::STATIC,
@@ -1474,7 +1474,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	    case 'G':
 	      /* The addresses in these entries are reported to be
 		 wrong.  See the code that reads 'G's for symtabs.  */
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_STATIC,
 				   data_sect_index,
 				   psymbol_placement::GLOBAL,
@@ -1492,15 +1492,15 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  || (p == namestring + 1
 		      && namestring[0] != ' '))
 		{
-		  add_psymbol_to_list (sym_name, sym_len, true,
-				       STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+		  add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+				       true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 				       psymbol_placement::STATIC,
 				       0, psymtab_language, objfile);
 		  if (p[2] == 't')
 		    {
 		      /* Also a typedef with the same name.  */
-		      add_psymbol_to_list (sym_name, sym_len, true,
-					   VAR_DOMAIN, LOC_TYPEDEF, -1,
+		      add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+					   true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					   psymbol_placement::STATIC,
 					   0, psymtab_language, objfile);
 		      p += 1;
@@ -1511,8 +1511,8 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	    case 't':
 	      if (p != namestring)	/* a name is there, not just :T...  */
 		{
-		  add_psymbol_to_list (sym_name, sym_len, true,
-				       VAR_DOMAIN, LOC_TYPEDEF, -1,
+		  add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+				       true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 				       psymbol_placement::STATIC,
 				       0, psymtab_language, objfile);
 		}
@@ -1572,7 +1572,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 			;
 		      /* Note that the value doesn't matter for
 			 enum constants in psymtabs, just in symtabs.  */
-		      add_psymbol_to_list (p, q - p, true,
+		      add_psymbol_to_list (gdb::string_view (p, q - p), true,
 					   VAR_DOMAIN, LOC_CONST, -1,
 					   psymbol_placement::STATIC, 0,
 					   psymtab_language, objfile);
@@ -1590,7 +1590,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 
 	    case 'c':
 	      /* Constant, e.g. from "const" in Pascal.  */
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_CONST, -1,
 				   psymbol_placement::STATIC, 0,
 				   psymtab_language, objfile);
@@ -1645,7 +1645,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  pst->set_text_low (nlist.n_value);
 		  textlow_not_set = 0;
 		}
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_BLOCK,
 				   SECT_OFF_TEXT (objfile),
 				   psymbol_placement::STATIC,
@@ -1704,7 +1704,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  pst->set_text_low (nlist.n_value);
 		  textlow_not_set = 0;
 		}
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_BLOCK,
 				   SECT_OFF_TEXT (objfile),
 				   psymbol_placement::GLOBAL,
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 1052501c351..ff0fc7a06a0 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -8922,7 +8922,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
              of the global scope.  But in Ada, we want to be able to access
              nested procedures globally.  So all Ada subprograms are stored
              in the global scope.  */
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_BLOCK,
 			       SECT_OFF_TEXT (objfile),
@@ -8932,7 +8932,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	}
       else
 	{
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_BLOCK,
 			       SECT_OFF_TEXT (objfile),
@@ -8944,7 +8944,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	set_objfile_main_name (objfile, actual_name, cu->language);
       break;
     case DW_TAG_constant:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
 			   -1, (pdi->is_external
 				? psymbol_placement::GLOBAL
@@ -8980,7 +8980,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	     table building.  */
 
 	  if (pdi->d.locdesc || pdi->has_type)
-	    add_psymbol_to_list (actual_name, strlen (actual_name),
+	    add_psymbol_to_list (actual_name,
 				 built_actual_name != NULL,
 				 VAR_DOMAIN, LOC_STATIC,
 				 SECT_OFF_TEXT (objfile),
@@ -8999,7 +8999,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	      return;
 	    }
 
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_STATIC,
 			       SECT_OFF_TEXT (objfile),
@@ -9011,7 +9011,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
     case DW_TAG_typedef:
     case DW_TAG_base_type:
     case DW_TAG_subrange_type:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_TYPEDEF, -1,
 			   psymbol_placement::STATIC,
@@ -9019,7 +9019,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
       break;
     case DW_TAG_imported_declaration:
     case DW_TAG_namespace:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_TYPEDEF, -1,
 			   psymbol_placement::GLOBAL,
@@ -9030,7 +9030,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
          available without any name.  If so, we skip the module as it
          doesn't bring any value.  */
       if (actual_name != nullptr)
-	add_psymbol_to_list (actual_name, strlen (actual_name),
+	add_psymbol_to_list (actual_name,
 			     built_actual_name != NULL,
 			     MODULE_DOMAIN, LOC_TYPEDEF, -1,
 			     psymbol_placement::GLOBAL,
@@ -9054,7 +9054,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 
       /* NOTE: carlton/2003-10-07: See comment in new_symbol about
 	 static vs. global.  */
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 			   cu->language == language_cplus
@@ -9064,7 +9064,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 
       break;
     case DW_TAG_enumerator:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_CONST, -1,
 			   cu->language == language_cplus
@@ -9888,8 +9888,7 @@ fixup_go_packaging (struct dwarf2_cu *cu)
 
       sym = allocate_symbol (objfile);
       SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
-      SYMBOL_SET_NAMES (sym, saved_package_name,
-			strlen (saved_package_name), 0, objfile);
+      SYMBOL_SET_NAMES (sym, saved_package_name, false, objfile);
       /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
 	 e.g., "main" finds the "main" module and not C's main().  */
       SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
@@ -18533,7 +18532,7 @@ load_partial_dies (const struct die_reader_specs *reader,
 	      || pdi.tag == DW_TAG_subrange_type))
 	{
 	  if (building_psymtab && pdi.name != NULL)
-	    add_psymbol_to_list (pdi.name, strlen (pdi.name), false,
+	    add_psymbol_to_list (pdi.name, false,
 				 VAR_DOMAIN, LOC_TYPEDEF, -1,
 				 psymbol_placement::STATIC,
 				 0, cu->language, objfile);
@@ -18567,7 +18566,7 @@ load_partial_dies (const struct die_reader_specs *reader,
 	  if (pdi.name == NULL)
 	    complaint (_("malformed enumerator DIE ignored"));
 	  else if (building_psymtab)
-	    add_psymbol_to_list (pdi.name, strlen (pdi.name), false,
+	    add_psymbol_to_list (pdi.name, false,
 				 VAR_DOMAIN, LOC_CONST, -1,
 				 cu->language == language_cplus
 				 ? psymbol_placement::GLOBAL
@@ -21551,7 +21550,7 @@ new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
       /* Cache this symbol's name and the name's demangled form (if any).  */
       SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
       linkagename = dwarf2_physname (name, die, cu);
-      SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
+      SYMBOL_SET_NAMES (sym, linkagename, false, objfile);
 
       /* Fortran does not have mangling standard and the mangling does differ
 	 between gfortran, iFort etc.  */
diff --git a/gdb/elfread.c b/gdb/elfread.c
index a3d17e54a2f..04b36d3dbad 100644
--- a/gdb/elfread.c
+++ b/gdb/elfread.c
@@ -203,8 +203,8 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       || ms_type == mst_text_gnu_ifunc)
     address = gdbarch_addr_bits_remove (gdbarch, address);
 
-  return reader.record_full (name, name_len, copy_name, address,
-			     ms_type,
+  return reader.record_full (gdb::string_view (name, name_len), copy_name,
+			     address, ms_type,
 			     gdb_bfd_section_index (objfile->obfd,
 						    bfd_section));
 }
diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index 0956fbdb675..5921251f65f 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -3048,8 +3048,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			  namestring = gdbarch_static_transform_name
 					 (gdbarch, namestring);
 
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_STATIC,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_STATIC,
 					     SECT_OFF_DATA (objfile),
 					     psymbol_placement::STATIC,
 					     sh.value,
@@ -3059,8 +3060,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			/* The addresses in these entries are reported
 			   to be wrong.  See the code that reads 'G's
 			   for symtabs.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_STATIC,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_STATIC,
 					     SECT_OFF_DATA (objfile),
 					     psymbol_placement::GLOBAL,
 					     sh.value,
@@ -3078,21 +3080,20 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    || (p == namestring + 1
 				&& namestring[0] != ' '))
 			  {
-			    add_psymbol_to_list (namestring, p - namestring, true,
-						 STRUCT_DOMAIN, LOC_TYPEDEF,
-						 -1,
-						 psymbol_placement::STATIC,
-						 0, psymtab_language, objfile);
+			    add_psymbol_to_list
+			      (gdb::string_view (namestring, p - namestring),
+			       true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+			       psymbol_placement::STATIC, 0, psymtab_language,
+			       objfile);
 			    if (p[2] == 't')
 			      {
 				/* Also a typedef with the same name.  */
-				add_psymbol_to_list (namestring,
-						     p - namestring, true,
-						     VAR_DOMAIN, LOC_TYPEDEF,
-						     -1,
-						     psymbol_placement::STATIC,
-						     0, psymtab_language,
-						     objfile);
+				add_psymbol_to_list
+				  (gdb::string_view (namestring,
+						     p - namestring),
+				   true, VAR_DOMAIN, LOC_TYPEDEF, -1,
+				   psymbol_placement::STATIC, 0,
+				   psymtab_language, objfile);
 				p += 1;
 			      }
 			  }
@@ -3101,11 +3102,12 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			if (p != namestring)	/* a name is there, not
 						   just :T...  */
 			  {
-			    add_psymbol_to_list (namestring, p - namestring,
-						 true, VAR_DOMAIN, LOC_TYPEDEF,
-						 -1,
-						 psymbol_placement::STATIC,
-						 0, psymtab_language, objfile);
+			    add_psymbol_to_list
+			      (gdb::string_view (namestring,
+						 p - namestring),
+			       true, VAR_DOMAIN, LOC_TYPEDEF, -1,
+			       psymbol_placement::STATIC, 0, psymtab_language,
+			       objfile);
 			  }
 		      check_enum:
 			/* If this is an enumerated type, we need to add
@@ -3166,9 +3168,10 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 				/* Note that the value doesn't matter for
 				   enum constants in psymtabs, just in
 				   symtabs.  */
-				add_psymbol_to_list (p, q - p, true,
-						     VAR_DOMAIN, LOC_CONST,
-						     -1,
+				add_psymbol_to_list (gdb::string_view (p,
+								       q - p),
+						     true, VAR_DOMAIN,
+						     LOC_CONST, -1,
 						     psymbol_placement::STATIC,
 						     0, psymtab_language,
 						     objfile);
@@ -3185,8 +3188,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			continue;
 		      case 'c':
 			/* Constant, e.g. from "const" in Pascal.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_CONST, -1,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_CONST, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
 			continue;
@@ -3198,8 +3202,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    function_outside_compilation_unit_complaint
 			      (copy.c_str ());
 			  }
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_BLOCK,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_BLOCK,
 					     SECT_OFF_TEXT (objfile),
 					     psymbol_placement::STATIC,
 					     sh.value,
@@ -3217,8 +3222,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    function_outside_compilation_unit_complaint
 			      (copy.c_str ());
 			  }
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_BLOCK,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_BLOCK,
 					     SECT_OFF_TEXT (objfile),
 					     psymbol_placement::GLOBAL,
 					     sh.value,
@@ -3452,13 +3458,13 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		     symbol table, and the MAIN__ symbol via the minimal
 		     symbol table.  */
 		  if (sh.st == stProc)
-		    add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		    add_psymbol_to_list (sym_name, true,
 					 VAR_DOMAIN, LOC_BLOCK,
 					 section,
 					 psymbol_placement::GLOBAL,
 					 sh.value, psymtab_language, objfile);
 		  else
-		    add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		    add_psymbol_to_list (sym_name, true,
 					 VAR_DOMAIN, LOC_BLOCK,
 					 section,
 					 psymbol_placement::STATIC,
@@ -3525,7 +3531,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		      && sh.iss != 0
 		      && sh.index != cur_sdx + 2)
 		    {
-		      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		      add_psymbol_to_list (sym_name, true,
 					   STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 					   psymbol_placement::STATIC,
 					   0, psymtab_language, objfile);
@@ -3565,7 +3571,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		  continue;
 		}
 	      /* Use this gdb symbol.  */
-	      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+	      add_psymbol_to_list (sym_name, true,
 				   VAR_DOMAIN, theclass, section,
 				   psymbol_placement::STATIC,
 				   sh.value, psymtab_language, objfile);
@@ -3644,7 +3650,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		  break;
 		}
 	      char *sym_name = debug_info->ssext + psh->iss;
-	      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+	      add_psymbol_to_list (sym_name, true,
 				   VAR_DOMAIN, theclass,
 				   section,
 				   psymbol_placement::GLOBAL,
@@ -3807,7 +3813,7 @@ handle_psymbol_enumerators (struct objfile *objfile, FDR *fh, int stype,
 
       /* Note that the value doesn't matter for enum constants
          in psymtabs, just in symtabs.  */
-      add_psymbol_to_list (name, strlen (name), true,
+      add_psymbol_to_list (name, true,
 			   VAR_DOMAIN, LOC_CONST, -1,
 			   psymbol_placement::STATIC, 0,
 			   psymtab_language, objfile);
@@ -4758,7 +4764,7 @@ new_symbol (const char *name)
 
   SYMBOL_SET_LANGUAGE (s, psymtab_language,
 		       &mdebugread_objfile->objfile_obstack);
-  SYMBOL_SET_NAMES (s, name, strlen (name), 1, mdebugread_objfile);
+  SYMBOL_SET_NAMES (s, name, true, mdebugread_objfile);
   return s;
 }
 
diff --git a/gdb/minsyms.c b/gdb/minsyms.c
index f06de4d88eb..0e5abfb2bde 100644
--- a/gdb/minsyms.c
+++ b/gdb/minsyms.c
@@ -1063,7 +1063,7 @@ mst_str (minimal_symbol_type t)
 /* See minsyms.h.  */
 
 struct minimal_symbol *
-minimal_symbol_reader::record_full (const char *name, int name_len,
+minimal_symbol_reader::record_full (gdb::string_view name,
 				    bool copy_name, CORE_ADDR address,
 				    enum minimal_symbol_type ms_type,
 				    int section)
@@ -1077,24 +1077,24 @@ minimal_symbol_reader::record_full (const char *name, int name_len,
      lookup_minimal_symbol_by_pc would have no way of getting the
      right one.  */
   if (ms_type == mst_file_text && name[0] == 'g'
-      && (strcmp (name, GCC_COMPILED_FLAG_SYMBOL) == 0
-	  || strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0))
+      && (strcmp (name.data (), GCC_COMPILED_FLAG_SYMBOL) == 0
+	  || strcmp (name.data (), GCC2_COMPILED_FLAG_SYMBOL) == 0))
     return (NULL);
 
   /* It's safe to strip the leading char here once, since the name
      is also stored stripped in the minimal symbol table.  */
   if (name[0] == get_symbol_leading_char (m_objfile->obfd))
     {
-      ++name;
-      --name_len;
+      name = gdb::string_view (name.data() + 1, name.length () - 1);
     }
 
-  if (ms_type == mst_file_text && startswith (name, "__gnu_compiled"))
+  if (ms_type == mst_file_text && startswith (name.data (), "__gnu_compiled"))
     return (NULL);
 
   if (symtab_create_debug >= 2)
     printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %s\n",
-               mst_str (ms_type), hex_string (address), section, name);
+               mst_str (ms_type), hex_string (address), section,
+	       name.data ());
 
   if (m_msym_bunch_index == BUNCH_SIZE)
     {
@@ -1106,7 +1106,7 @@ minimal_symbol_reader::record_full (const char *name, int name_len,
   msymbol = &m_msym_bunch->contents[m_msym_bunch_index];
   symbol_set_language (msymbol, language_auto,
 		       &m_objfile->per_bfd->storage_obstack);
-  symbol_set_names (msymbol, name, name_len, copy_name, m_objfile->per_bfd);
+  symbol_set_names (msymbol, name, copy_name, m_objfile->per_bfd);
 
   SET_MSYMBOL_VALUE_ADDRESS (msymbol, address);
   MSYMBOL_SECTION (msymbol) = section;
diff --git a/gdb/minsyms.h b/gdb/minsyms.h
index bb43165620d..3c21f67a573 100644
--- a/gdb/minsyms.h
+++ b/gdb/minsyms.h
@@ -88,7 +88,6 @@ class minimal_symbol_reader
      Arguments are:
 
      NAME - the symbol's name
-     NAME_LEN - the length of the name
      COPY_NAME - if true, the minsym code must make a copy of NAME.  If
      false, then NAME must be NUL-terminated, and must have a lifetime
      that is at least as long as OBJFILE's lifetime.
@@ -97,15 +96,14 @@ class minimal_symbol_reader
      SECTION - the symbol's section
   */
 
-  struct minimal_symbol *record_full (const char *name,
-				      int name_len,
+  struct minimal_symbol *record_full (gdb::string_view name,
 				      bool copy_name,
 				      CORE_ADDR address,
 				      enum minimal_symbol_type ms_type,
 				      int section);
 
   /* Like record_full, but:
-     - uses strlen to compute NAME_LEN,
+     - computes the length of NAME
      - passes COPY_NAME = true,
      - and passes a default SECTION, depending on the type
 
@@ -115,7 +113,7 @@ class minimal_symbol_reader
 	       enum minimal_symbol_type ms_type);
 
   /* Like record_full, but:
-     - uses strlen to compute NAME_LEN,
+     - computes the length of NAME
      - passes COPY_NAME = true.
 
      This variant does not return the new symbol.  */
@@ -124,7 +122,7 @@ class minimal_symbol_reader
 			 enum minimal_symbol_type ms_type,
 			 int section)
   {
-    record_full (name, strlen (name), true, address, ms_type, section);
+    record_full (name, true, address, ms_type, section);
   }
 
  private:
diff --git a/gdb/psympriv.h b/gdb/psympriv.h
index 9d22f5c9acf..52834a39c32 100644
--- a/gdb/psympriv.h
+++ b/gdb/psympriv.h
@@ -22,6 +22,7 @@
 
 #include "psymtab.h"
 #include "objfiles.h"
+#include "gdbsupport/gdb_string_view.h"
 
 /* A partial_symbol records the name, domain, and address class of
    symbols whose types we have not parsed yet.  For functions, it also
@@ -288,7 +289,7 @@ enum class psymbol_placement
 
 /* Add any kind of symbol to a partial_symbol vector.  */
 
-extern void add_psymbol_to_list (const char *, int,
+extern void add_psymbol_to_list (gdb::string_view,
 				 bool, domain_enum,
 				 enum address_class,
 				 short /* section */,
diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index 031dbd9c1ef..8ed2a783687 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -1568,7 +1568,7 @@ psymbol_compare (const void *addr1, const void *addr2, int length)
    different domain (or address) is possible and correct.  */
 
 static struct partial_symbol *
-add_psymbol_to_bcache (const char *name, int namelength, bool copy_name,
+add_psymbol_to_bcache (gdb::string_view name, bool copy_name,
 		       domain_enum domain,
 		       enum address_class theclass,
 		       short section,
@@ -1585,7 +1585,7 @@ add_psymbol_to_bcache (const char *name, int namelength, bool copy_name,
   psymbol.aclass = theclass;
   symbol_set_language (&psymbol.ginfo, language,
 		       objfile->partial_symtabs->obstack ());
-  symbol_set_names (&psymbol.ginfo, name, namelength, copy_name,
+  symbol_set_names (&psymbol.ginfo, name, copy_name,
 		    objfile->per_bfd);
 
   /* Stash the partial symbol away in the cache.  */
@@ -1612,7 +1612,7 @@ append_psymbol_to_list (std::vector<partial_symbol *> *list,
    Return the partial symbol that has been added.  */
 
 void
-add_psymbol_to_list (const char *name, int namelength, bool copy_name,
+add_psymbol_to_list (gdb::string_view name, bool copy_name,
 		     domain_enum domain,
 		     enum address_class theclass,
 		     short section,
@@ -1625,7 +1625,7 @@ add_psymbol_to_list (const char *name, int namelength, bool copy_name,
   int added;
 
   /* Stash the partial symbol away in the cache.  */
-  psym = add_psymbol_to_bcache (name, namelength, copy_name, domain, theclass,
+  psym = add_psymbol_to_bcache (name, copy_name, domain, theclass,
 				section, coreaddr, language, objfile, &added);
 
   /* Do not duplicate global partial symbols.  */
diff --git a/gdb/stabsread.c b/gdb/stabsread.c
index 48c88ded553..d8cb4a5264e 100644
--- a/gdb/stabsread.c
+++ b/gdb/stabsread.c
@@ -751,11 +751,12 @@ define_symbol (CORE_ADDR valu, const char *string, int desc, int type,
       if (!new_name.empty ())
 	{
 	  SYMBOL_SET_NAMES (sym,
-			    new_name.c_str (), new_name.length (),
+			    new_name,
 			    1, objfile);
 	}
       else
-	SYMBOL_SET_NAMES (sym, string, p - string, 1, objfile);
+	SYMBOL_SET_NAMES (sym, gdb::string_view (string, p - string), true,
+			  objfile);
 
       if (SYMBOL_LANGUAGE (sym) == language_cplus)
 	cp_scan_for_anonymous_namespaces (get_buildsym_compunit (), sym,
diff --git a/gdb/symtab.c b/gdb/symtab.c
index 6ea9fc6971e..16cb5b7c941 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -811,7 +811,7 @@ symbol_find_demangled_name (struct general_symbol_info *gsymbol,
 
 void
 symbol_set_names (struct general_symbol_info *gsymbol,
-		  const char *linkage_name, int len, bool copy_name,
+		  gdb::string_view linkage_name, bool copy_name,
 		  struct objfile_per_bfd_storage *per_bfd)
 {
   struct demangled_name_entry **slot;
@@ -824,14 +824,14 @@ symbol_set_names (struct general_symbol_info *gsymbol,
       /* In Ada, we do the symbol lookups using the mangled name, so
          we can save some space by not storing the demangled name.  */
       if (!copy_name)
-	gsymbol->name = linkage_name;
+	gsymbol->name = linkage_name.data ();
       else
 	{
 	  char *name = (char *) obstack_alloc (&per_bfd->storage_obstack,
-					       len + 1);
+					       linkage_name.length () + 1);
 
-	  memcpy (name, linkage_name, len);
-	  name[len] = '\0';
+	  memcpy (name, linkage_name.data (), linkage_name.length ());
+	  name[linkage_name.length ()] = '\0';
 	  gsymbol->name = name;
 	}
       symbol_set_demangled_name (gsymbol, NULL, &per_bfd->storage_obstack);
@@ -842,18 +842,18 @@ symbol_set_names (struct general_symbol_info *gsymbol,
   if (per_bfd->demangled_names_hash == NULL)
     create_demangled_names_hash (per_bfd);
 
-  if (linkage_name[len] != '\0')
+  if (linkage_name[linkage_name.length ()] != '\0')
     {
       char *alloc_name;
 
-      alloc_name = (char *) alloca (len + 1);
-      memcpy (alloc_name, linkage_name, len);
-      alloc_name[len] = '\0';
+      alloc_name = (char *) alloca (linkage_name.length () + 1);
+      memcpy (alloc_name, linkage_name.data (), linkage_name.length ());
+      alloc_name[linkage_name.length ()] = '\0';
 
       linkage_name_copy = alloc_name;
     }
   else
-    linkage_name_copy = linkage_name;
+    linkage_name_copy = linkage_name.data ();
 
   entry.mangled = linkage_name_copy;
   slot = ((struct demangled_name_entry **)
@@ -881,14 +881,14 @@ symbol_set_names (struct general_symbol_info *gsymbol,
 	 It turns out that it is actually important to still save such
 	 an entry in the hash table, because storing this name gives
 	 us better bcache hit rates for partial symbols.  */
-      if (!copy_name && linkage_name_copy == linkage_name)
+      if (!copy_name && linkage_name_copy == linkage_name.data ())
 	{
 	  *slot
 	    = ((struct demangled_name_entry *)
 	       obstack_alloc (&per_bfd->storage_obstack,
 			      offsetof (struct demangled_name_entry, demangled)
 			      + demangled_len + 1));
-	  (*slot)->mangled = linkage_name;
+	  (*slot)->mangled = linkage_name.data ();
 	}
       else
 	{
@@ -901,7 +901,7 @@ symbol_set_names (struct general_symbol_info *gsymbol,
 	    = ((struct demangled_name_entry *)
 	       obstack_alloc (&per_bfd->storage_obstack,
 			      offsetof (struct demangled_name_entry, demangled)
-			      + len + demangled_len + 2));
+			      + linkage_name.length () + demangled_len + 2));
 	  mangled_ptr = &((*slot)->demangled[demangled_len + 1]);
 	  strcpy (mangled_ptr, linkage_name_copy);
 	  (*slot)->mangled = mangled_ptr;
diff --git a/gdb/symtab.h b/gdb/symtab.h
index 1f0fc62a657..1546d830293 100644
--- a/gdb/symtab.h
+++ b/gdb/symtab.h
@@ -29,6 +29,7 @@
 #include "gdbsupport/enum-flags.h"
 #include "gdbsupport/function-view.h"
 #include "gdbsupport/gdb_optional.h"
+#include "gdbsupport/gdb_string_view.h"
 #include "gdbsupport/next-iterator.h"
 #include "completer.h"
 
@@ -493,11 +494,11 @@ extern void symbol_set_language (struct general_symbol_info *symbol,
 
 /* Set the linkage and natural names of a symbol, by demangling
    the linkage name.  */
-#define SYMBOL_SET_NAMES(symbol,linkage_name,len,copy_name,objfile)	\
-  symbol_set_names (&(symbol)->ginfo, linkage_name, len, copy_name, \
+#define SYMBOL_SET_NAMES(symbol,linkage_name,copy_name,objfile)	\
+  symbol_set_names (&(symbol)->ginfo, linkage_name, copy_name, \
 		    (objfile)->per_bfd)
 extern void symbol_set_names (struct general_symbol_info *symbol,
-			      const char *linkage_name, int len, bool copy_name,
+			      gdb::string_view linkage_name, bool copy_name,
 			      struct objfile_per_bfd_storage *per_bfd);
 
 /* Now come lots of name accessor macros.  Short version as to when to
diff --git a/gdb/xcoffread.c b/gdb/xcoffread.c
index 2fa27066539..52a700215dc 100644
--- a/gdb/xcoffread.c
+++ b/gdb/xcoffread.c
@@ -2644,8 +2644,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		  namestring = gdbarch_static_transform_name
 				 (gdbarch, namestring);
 
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_STATIC,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_STATIC,
 				     SECT_OFF_DATA (objfile),
 				     psymbol_placement::STATIC,
 				     symbol.n_value,
@@ -2655,8 +2656,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 	      case 'G':
 		/* The addresses in these entries are reported to be
 		   wrong.  See the code that reads 'G's for symtabs.  */
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_STATIC,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_STATIC,
 				     SECT_OFF_DATA (objfile),
 				     psymbol_placement::GLOBAL,
 				     symbol.n_value,
@@ -2674,15 +2676,17 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		    || (p == namestring + 1
 			&& namestring[0] != ' '))
 		  {
-		    add_psymbol_to_list (namestring, p - namestring, true,
-					 STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+		    add_psymbol_to_list (gdb::string_view (namestring,
+							   p - namestring),
+					 true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 					 psymbol_placement::STATIC,
 					 0, psymtab_language, objfile);
 		    if (p[2] == 't')
 		      {
 			/* Also a typedef with the same name.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_TYPEDEF, -1,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
 			p += 1;
@@ -2693,8 +2697,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 	      case 't':
 		if (p != namestring)	/* a name is there, not just :T...  */
 		  {
-		    add_psymbol_to_list (namestring, p - namestring, true,
-					 VAR_DOMAIN, LOC_TYPEDEF, -1,
+		    add_psymbol_to_list (gdb::string_view (namestring,
+							   p - namestring),
+					 true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					 psymbol_placement::STATIC,
 					 0, psymtab_language, objfile);
 		  }
@@ -2755,7 +2760,7 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 			  ;
 			/* Note that the value doesn't matter for
 			   enum constants in psymtabs, just in symtabs.  */
-			add_psymbol_to_list (p, q - p, true,
+			add_psymbol_to_list (gdb::string_view (p, q - p), true,
 					     VAR_DOMAIN, LOC_CONST, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
@@ -2773,8 +2778,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 
 	      case 'c':
 		/* Constant, e.g. from "const" in Pascal.  */
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_CONST, -1,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_CONST, -1,
 				     psymbol_placement::STATIC,
 				     0, psymtab_language, objfile);
 		continue;
@@ -2790,8 +2796,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		    function_outside_compilation_unit_complaint (name);
 		    xfree (name);
 		  }
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_BLOCK,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_BLOCK,
 				     SECT_OFF_TEXT (objfile),
 				     psymbol_placement::STATIC,
 				     symbol.n_value,
@@ -2820,8 +2827,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		if (startswith (namestring, "@FIX"))
 		  continue;
 
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_BLOCK,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_BLOCK,
 				     SECT_OFF_TEXT (objfile),
 				     psymbol_placement::GLOBAL,
 				     symbol.n_value,
-- 
2.23.0.444.g18eeb5a265-goog

Re: [PATCH] Change some arguments to gdb::string_view instead of name+len

[Tom Tromey]

>>>>> "Christian" == Christian Biesinger via gdb-patches <gdb-patches@sourceware.org> writes:

Christian> Just some code cleanup. This change has a few benefits:
Christian> - Shorter argument list in the functions
Christian> - If the caller needs to calculate the string, they no longer
Christian>   need to explicitly call strlen
Christian> - It is easy to pass std::string to this (done in one place
Christian>   currently)

Christian> This also updates a couple of places that were passing 0/1 to
Christian> a bool parameter.

Thanks for doing this.  I think it is a nice cleanup.

Christian> -minimal_symbol_reader::record_full (const char *name, int name_len,
[...]

Christian>    if (name[0] == get_symbol_leading_char (m_objfile->obfd))
Christian>      {
Christian> -      ++name;
Christian> -      --name_len;
Christian> +      name = gdb::string_view (name.data() + 1, name.length () - 1);

This could probably use the substr method.

Christian>    if (symtab_create_debug >= 2)
Christian>      printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %s\n",
Christian> -               mst_str (ms_type), hex_string (address), section, name);
Christian> +               mst_str (ms_type), hex_string (address), section,
Christian> +	       name.data ());

This part made me hesitate a bit, because it seems to be at odds with
the idea that an arbitrary string view can be passed in -- for all we
know the string isn't \0-terminated, and this will cause bad behavior.

On the other hand, this error already existed, and is only used for
logging.

Maybe safest is just to transform it to a std::string here?

Tom

Re: [PATCH] Change some arguments to gdb::string_view instead of name+len

[Pedro Alves]

On 9/30/19 3:28 PM, Tom Tromey wrote:
>>>>>> "Christian" == Christian Biesinger via gdb-patches <gdb-patches@sourceware.org> writes:

> Christian>    if (symtab_create_debug >= 2)
> Christian>      printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %s\n",
> Christian> -               mst_str (ms_type), hex_string (address), section, name);
> Christian> +               mst_str (ms_type), hex_string (address), section,
> Christian> +	       name.data ());
> 
> This part made me hesitate a bit, because it seems to be at odds with
> the idea that an arbitrary string view can be passed in -- for all we
> know the string isn't \0-terminated, and this will cause bad behavior.
> 
> On the other hand, this error already existed, and is only used for
> logging.
> 
> Maybe safest is just to transform it to a std::string here?

Or 

  "%.*s", name.size (), name.data ()

Thanks,
Pedro Alves

Re: [PATCH] Change some arguments to gdb::string_view instead of name+len

[Tom Tromey]

>>>>> "Pedro" == Pedro Alves <palves@redhat.com> writes:

>> Maybe safest is just to transform it to a std::string here?

Pedro> Or 

Pedro>   "%.*s", name.size (), name.data ()

Yeah, even better; not sure why I didn't remember this.

Also I think it has to cast to int there.

Tom

Re: [PATCH] Change some arguments to gdb::string_view instead of name+len

[Christian Biesinger via gdb-patches]

On Mon, Sep 30, 2019 at 11:24 AM Tom Tromey <tom@tromey.com> wrote:
>
> >>>>> "Pedro" == Pedro Alves <palves@redhat.com> writes:
>
> >> Maybe safest is just to transform it to a std::string here?
>
> Pedro> Or
>
> Pedro>   "%.*s", name.size (), name.data ()
>
> Yeah, even better; not sure why I didn't remember this.
>
> Also I think it has to cast to int there.

OK, fixed. Sending a new version of the patch now.

Christian

[PATCH v2] Change some arguments to gdb::string_view instead of name+len

[Christian Biesinger via gdb-patches]

Just some code cleanup. This change has a few benefits:
- Shorter argument list in the functions
- If the caller needs to calculate the string, they no longer
  need to explicitly call strlen
- It is easy to pass std::string to this (done in one place
  currently)

This also updates a couple of places that were passing 0/1 to
a bool parameter.

gdb/ChangeLog:

2019-09-29  Christian Biesinger  <cbiesinger@google.com>

	* coffread.c (record_minimal_symbol): Update.
	(process_coff_symbol): Update.
	* dbxread.c (read_dbx_symtab): Update.
	* dwarf2read.c (add_partial_symbol): Update.
	(fixup_go_packaging): Update.
	(load_partial_dies): Update.
	(new_symbol): Update.
	* elfread.c (record_minimal_symbol): Update.
	* mdebugread.c (parse_partial_symbols): Update.
	(handle_psymbol_enumerators): Update.
	(new_symbol): Update.
	* minsyms.c (minimal_symbol_reader::record_full): Change signature
	to use gdb::string_view instead of name+len.
	* minsyms.h (class minimal_symbol_reader) <record_full>: Likewise.
	* psympriv.h (add_psymbol_to_list): Likewise.
	* psymtab.c (add_psymbol_to_bcache): Likewise.
	(add_psymbol_to_list): Likewise.
	* stabsread.c (define_symbol): Update.
	* symtab.c (symbol_set_names): Change signature to use gdb::string_view.
	* symtab.h (SYMBOL_SET_NAMES): Likewise.
	(symbol_set_names): Likewise.
	* xcoffread.c (scan_xcoff_symtab): Update.
---
 gdb/coffread.c   |  5 ++-
 gdb/dbxread.c    | 24 +++++++--------
 gdb/dwarf2read.c | 29 +++++++++---------
 gdb/elfread.c    |  4 +--
 gdb/mdebugread.c | 80 ++++++++++++++++++++++++++----------------------
 gdb/minsyms.c    | 18 +++++------
 gdb/minsyms.h    | 10 +++---
 gdb/psympriv.h   | 16 +++++-----
 gdb/psymtab.c    |  8 ++---
 gdb/stabsread.c  |  5 +--
 gdb/symtab.c     | 26 ++++++++--------
 gdb/symtab.h     |  7 +++--
 gdb/xcoffread.c  | 42 +++++++++++++++----------
 13 files changed, 143 insertions(+), 131 deletions(-)

diff --git a/gdb/coffread.c b/gdb/coffread.c
index c44b69069e..52b9c57b9c 100644
--- a/gdb/coffread.c
+++ b/gdb/coffread.c
@@ -462,8 +462,7 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       return NULL;
     }
 
-  return reader.record_full (cs->c_name, strlen (cs->c_name), true, address,
-			     type, section);
+  return reader.record_full (cs->c_name, true, address, type, section);
 }
 \f
 /* coff_symfile_init ()
@@ -1569,7 +1568,7 @@ process_coff_symbol (struct coff_symbol *cs,
   name = EXTERNAL_NAME (name, objfile->obfd);
   SYMBOL_SET_LANGUAGE (sym, get_current_subfile ()->language,
 		       &objfile->objfile_obstack);
-  SYMBOL_SET_NAMES (sym, name, strlen (name), 1, objfile);
+  SYMBOL_SET_NAMES (sym, name, true, objfile);
 
   /* default assumptions */
   SYMBOL_VALUE (sym) = cs->c_value;
diff --git a/gdb/dbxread.c b/gdb/dbxread.c
index 564c5d3a41..16727ef108 100644
--- a/gdb/dbxread.c
+++ b/gdb/dbxread.c
@@ -1464,7 +1464,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	      if (gdbarch_static_transform_name_p (gdbarch))
 		gdbarch_static_transform_name (gdbarch, namestring);
 
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_STATIC,
 				   data_sect_index,
 				   psymbol_placement::STATIC,
@@ -1474,7 +1474,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	    case 'G':
 	      /* The addresses in these entries are reported to be
 		 wrong.  See the code that reads 'G's for symtabs.  */
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_STATIC,
 				   data_sect_index,
 				   psymbol_placement::GLOBAL,
@@ -1492,15 +1492,15 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  || (p == namestring + 1
 		      && namestring[0] != ' '))
 		{
-		  add_psymbol_to_list (sym_name, sym_len, true,
-				       STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+		  add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+				       true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 				       psymbol_placement::STATIC,
 				       0, psymtab_language, objfile);
 		  if (p[2] == 't')
 		    {
 		      /* Also a typedef with the same name.  */
-		      add_psymbol_to_list (sym_name, sym_len, true,
-					   VAR_DOMAIN, LOC_TYPEDEF, -1,
+		      add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+					   true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					   psymbol_placement::STATIC,
 					   0, psymtab_language, objfile);
 		      p += 1;
@@ -1511,8 +1511,8 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	    case 't':
 	      if (p != namestring)	/* a name is there, not just :T...  */
 		{
-		  add_psymbol_to_list (sym_name, sym_len, true,
-				       VAR_DOMAIN, LOC_TYPEDEF, -1,
+		  add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+				       true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 				       psymbol_placement::STATIC,
 				       0, psymtab_language, objfile);
 		}
@@ -1572,7 +1572,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 			;
 		      /* Note that the value doesn't matter for
 			 enum constants in psymtabs, just in symtabs.  */
-		      add_psymbol_to_list (p, q - p, true,
+		      add_psymbol_to_list (gdb::string_view (p, q - p), true,
 					   VAR_DOMAIN, LOC_CONST, -1,
 					   psymbol_placement::STATIC, 0,
 					   psymtab_language, objfile);
@@ -1590,7 +1590,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 
 	    case 'c':
 	      /* Constant, e.g. from "const" in Pascal.  */
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_CONST, -1,
 				   psymbol_placement::STATIC, 0,
 				   psymtab_language, objfile);
@@ -1645,7 +1645,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  pst->set_text_low (nlist.n_value);
 		  textlow_not_set = 0;
 		}
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_BLOCK,
 				   SECT_OFF_TEXT (objfile),
 				   psymbol_placement::STATIC,
@@ -1704,7 +1704,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  pst->set_text_low (nlist.n_value);
 		  textlow_not_set = 0;
 		}
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_BLOCK,
 				   SECT_OFF_TEXT (objfile),
 				   psymbol_placement::GLOBAL,
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 1052501c35..ff0fc7a06a 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -8922,7 +8922,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
              of the global scope.  But in Ada, we want to be able to access
              nested procedures globally.  So all Ada subprograms are stored
              in the global scope.  */
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_BLOCK,
 			       SECT_OFF_TEXT (objfile),
@@ -8932,7 +8932,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	}
       else
 	{
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_BLOCK,
 			       SECT_OFF_TEXT (objfile),
@@ -8944,7 +8944,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	set_objfile_main_name (objfile, actual_name, cu->language);
       break;
     case DW_TAG_constant:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
 			   -1, (pdi->is_external
 				? psymbol_placement::GLOBAL
@@ -8980,7 +8980,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	     table building.  */
 
 	  if (pdi->d.locdesc || pdi->has_type)
-	    add_psymbol_to_list (actual_name, strlen (actual_name),
+	    add_psymbol_to_list (actual_name,
 				 built_actual_name != NULL,
 				 VAR_DOMAIN, LOC_STATIC,
 				 SECT_OFF_TEXT (objfile),
@@ -8999,7 +8999,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	      return;
 	    }
 
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_STATIC,
 			       SECT_OFF_TEXT (objfile),
@@ -9011,7 +9011,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
     case DW_TAG_typedef:
     case DW_TAG_base_type:
     case DW_TAG_subrange_type:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_TYPEDEF, -1,
 			   psymbol_placement::STATIC,
@@ -9019,7 +9019,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
       break;
     case DW_TAG_imported_declaration:
     case DW_TAG_namespace:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_TYPEDEF, -1,
 			   psymbol_placement::GLOBAL,
@@ -9030,7 +9030,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
          available without any name.  If so, we skip the module as it
          doesn't bring any value.  */
       if (actual_name != nullptr)
-	add_psymbol_to_list (actual_name, strlen (actual_name),
+	add_psymbol_to_list (actual_name,
 			     built_actual_name != NULL,
 			     MODULE_DOMAIN, LOC_TYPEDEF, -1,
 			     psymbol_placement::GLOBAL,
@@ -9054,7 +9054,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 
       /* NOTE: carlton/2003-10-07: See comment in new_symbol about
 	 static vs. global.  */
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 			   cu->language == language_cplus
@@ -9064,7 +9064,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 
       break;
     case DW_TAG_enumerator:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_CONST, -1,
 			   cu->language == language_cplus
@@ -9888,8 +9888,7 @@ fixup_go_packaging (struct dwarf2_cu *cu)
 
       sym = allocate_symbol (objfile);
       SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
-      SYMBOL_SET_NAMES (sym, saved_package_name,
-			strlen (saved_package_name), 0, objfile);
+      SYMBOL_SET_NAMES (sym, saved_package_name, false, objfile);
       /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
 	 e.g., "main" finds the "main" module and not C's main().  */
       SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
@@ -18533,7 +18532,7 @@ load_partial_dies (const struct die_reader_specs *reader,
 	      || pdi.tag == DW_TAG_subrange_type))
 	{
 	  if (building_psymtab && pdi.name != NULL)
-	    add_psymbol_to_list (pdi.name, strlen (pdi.name), false,
+	    add_psymbol_to_list (pdi.name, false,
 				 VAR_DOMAIN, LOC_TYPEDEF, -1,
 				 psymbol_placement::STATIC,
 				 0, cu->language, objfile);
@@ -18567,7 +18566,7 @@ load_partial_dies (const struct die_reader_specs *reader,
 	  if (pdi.name == NULL)
 	    complaint (_("malformed enumerator DIE ignored"));
 	  else if (building_psymtab)
-	    add_psymbol_to_list (pdi.name, strlen (pdi.name), false,
+	    add_psymbol_to_list (pdi.name, false,
 				 VAR_DOMAIN, LOC_CONST, -1,
 				 cu->language == language_cplus
 				 ? psymbol_placement::GLOBAL
@@ -21551,7 +21550,7 @@ new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
       /* Cache this symbol's name and the name's demangled form (if any).  */
       SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
       linkagename = dwarf2_physname (name, die, cu);
-      SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
+      SYMBOL_SET_NAMES (sym, linkagename, false, objfile);
 
       /* Fortran does not have mangling standard and the mangling does differ
 	 between gfortran, iFort etc.  */
diff --git a/gdb/elfread.c b/gdb/elfread.c
index a3d17e54a2..04b36d3dba 100644
--- a/gdb/elfread.c
+++ b/gdb/elfread.c
@@ -203,8 +203,8 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       || ms_type == mst_text_gnu_ifunc)
     address = gdbarch_addr_bits_remove (gdbarch, address);
 
-  return reader.record_full (name, name_len, copy_name, address,
-			     ms_type,
+  return reader.record_full (gdb::string_view (name, name_len), copy_name,
+			     address, ms_type,
 			     gdb_bfd_section_index (objfile->obfd,
 						    bfd_section));
 }
diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index 0956fbdb67..5921251f65 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -3048,8 +3048,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			  namestring = gdbarch_static_transform_name
 					 (gdbarch, namestring);
 
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_STATIC,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_STATIC,
 					     SECT_OFF_DATA (objfile),
 					     psymbol_placement::STATIC,
 					     sh.value,
@@ -3059,8 +3060,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			/* The addresses in these entries are reported
 			   to be wrong.  See the code that reads 'G's
 			   for symtabs.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_STATIC,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_STATIC,
 					     SECT_OFF_DATA (objfile),
 					     psymbol_placement::GLOBAL,
 					     sh.value,
@@ -3078,21 +3080,20 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    || (p == namestring + 1
 				&& namestring[0] != ' '))
 			  {
-			    add_psymbol_to_list (namestring, p - namestring, true,
-						 STRUCT_DOMAIN, LOC_TYPEDEF,
-						 -1,
-						 psymbol_placement::STATIC,
-						 0, psymtab_language, objfile);
+			    add_psymbol_to_list
+			      (gdb::string_view (namestring, p - namestring),
+			       true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+			       psymbol_placement::STATIC, 0, psymtab_language,
+			       objfile);
 			    if (p[2] == 't')
 			      {
 				/* Also a typedef with the same name.  */
-				add_psymbol_to_list (namestring,
-						     p - namestring, true,
-						     VAR_DOMAIN, LOC_TYPEDEF,
-						     -1,
-						     psymbol_placement::STATIC,
-						     0, psymtab_language,
-						     objfile);
+				add_psymbol_to_list
+				  (gdb::string_view (namestring,
+						     p - namestring),
+				   true, VAR_DOMAIN, LOC_TYPEDEF, -1,
+				   psymbol_placement::STATIC, 0,
+				   psymtab_language, objfile);
 				p += 1;
 			      }
 			  }
@@ -3101,11 +3102,12 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			if (p != namestring)	/* a name is there, not
 						   just :T...  */
 			  {
-			    add_psymbol_to_list (namestring, p - namestring,
-						 true, VAR_DOMAIN, LOC_TYPEDEF,
-						 -1,
-						 psymbol_placement::STATIC,
-						 0, psymtab_language, objfile);
+			    add_psymbol_to_list
+			      (gdb::string_view (namestring,
+						 p - namestring),
+			       true, VAR_DOMAIN, LOC_TYPEDEF, -1,
+			       psymbol_placement::STATIC, 0, psymtab_language,
+			       objfile);
 			  }
 		      check_enum:
 			/* If this is an enumerated type, we need to add
@@ -3166,9 +3168,10 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 				/* Note that the value doesn't matter for
 				   enum constants in psymtabs, just in
 				   symtabs.  */
-				add_psymbol_to_list (p, q - p, true,
-						     VAR_DOMAIN, LOC_CONST,
-						     -1,
+				add_psymbol_to_list (gdb::string_view (p,
+								       q - p),
+						     true, VAR_DOMAIN,
+						     LOC_CONST, -1,
 						     psymbol_placement::STATIC,
 						     0, psymtab_language,
 						     objfile);
@@ -3185,8 +3188,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			continue;
 		      case 'c':
 			/* Constant, e.g. from "const" in Pascal.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_CONST, -1,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_CONST, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
 			continue;
@@ -3198,8 +3202,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    function_outside_compilation_unit_complaint
 			      (copy.c_str ());
 			  }
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_BLOCK,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_BLOCK,
 					     SECT_OFF_TEXT (objfile),
 					     psymbol_placement::STATIC,
 					     sh.value,
@@ -3217,8 +3222,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    function_outside_compilation_unit_complaint
 			      (copy.c_str ());
 			  }
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_BLOCK,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_BLOCK,
 					     SECT_OFF_TEXT (objfile),
 					     psymbol_placement::GLOBAL,
 					     sh.value,
@@ -3452,13 +3458,13 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		     symbol table, and the MAIN__ symbol via the minimal
 		     symbol table.  */
 		  if (sh.st == stProc)
-		    add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		    add_psymbol_to_list (sym_name, true,
 					 VAR_DOMAIN, LOC_BLOCK,
 					 section,
 					 psymbol_placement::GLOBAL,
 					 sh.value, psymtab_language, objfile);
 		  else
-		    add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		    add_psymbol_to_list (sym_name, true,
 					 VAR_DOMAIN, LOC_BLOCK,
 					 section,
 					 psymbol_placement::STATIC,
@@ -3525,7 +3531,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		      && sh.iss != 0
 		      && sh.index != cur_sdx + 2)
 		    {
-		      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		      add_psymbol_to_list (sym_name, true,
 					   STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 					   psymbol_placement::STATIC,
 					   0, psymtab_language, objfile);
@@ -3565,7 +3571,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		  continue;
 		}
 	      /* Use this gdb symbol.  */
-	      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+	      add_psymbol_to_list (sym_name, true,
 				   VAR_DOMAIN, theclass, section,
 				   psymbol_placement::STATIC,
 				   sh.value, psymtab_language, objfile);
@@ -3644,7 +3650,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		  break;
 		}
 	      char *sym_name = debug_info->ssext + psh->iss;
-	      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+	      add_psymbol_to_list (sym_name, true,
 				   VAR_DOMAIN, theclass,
 				   section,
 				   psymbol_placement::GLOBAL,
@@ -3807,7 +3813,7 @@ handle_psymbol_enumerators (struct objfile *objfile, FDR *fh, int stype,
 
       /* Note that the value doesn't matter for enum constants
          in psymtabs, just in symtabs.  */
-      add_psymbol_to_list (name, strlen (name), true,
+      add_psymbol_to_list (name, true,
 			   VAR_DOMAIN, LOC_CONST, -1,
 			   psymbol_placement::STATIC, 0,
 			   psymtab_language, objfile);
@@ -4758,7 +4764,7 @@ new_symbol (const char *name)
 
   SYMBOL_SET_LANGUAGE (s, psymtab_language,
 		       &mdebugread_objfile->objfile_obstack);
-  SYMBOL_SET_NAMES (s, name, strlen (name), 1, mdebugread_objfile);
+  SYMBOL_SET_NAMES (s, name, true, mdebugread_objfile);
   return s;
 }
 
diff --git a/gdb/minsyms.c b/gdb/minsyms.c
index 83f5d89577..15651656f3 100644
--- a/gdb/minsyms.c
+++ b/gdb/minsyms.c
@@ -1063,7 +1063,7 @@ mst_str (minimal_symbol_type t)
 /* See minsyms.h.  */
 
 struct minimal_symbol *
-minimal_symbol_reader::record_full (const char *name, int name_len,
+minimal_symbol_reader::record_full (gdb::string_view name,
 				    bool copy_name, CORE_ADDR address,
 				    enum minimal_symbol_type ms_type,
 				    int section)
@@ -1077,24 +1077,24 @@ minimal_symbol_reader::record_full (const char *name, int name_len,
      lookup_minimal_symbol_by_pc would have no way of getting the
      right one.  */
   if (ms_type == mst_file_text && name[0] == 'g'
-      && (strcmp (name, GCC_COMPILED_FLAG_SYMBOL) == 0
-	  || strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0))
+      && (strcmp (name.data (), GCC_COMPILED_FLAG_SYMBOL) == 0
+	  || strcmp (name.data (), GCC2_COMPILED_FLAG_SYMBOL) == 0))
     return (NULL);
 
   /* It's safe to strip the leading char here once, since the name
      is also stored stripped in the minimal symbol table.  */
   if (name[0] == get_symbol_leading_char (m_objfile->obfd))
     {
-      ++name;
-      --name_len;
+      name = gdb::string_view (name.data () + 1, name.length () - 1);
     }
 
-  if (ms_type == mst_file_text && startswith (name, "__gnu_compiled"))
+  if (ms_type == mst_file_text && startswith (name.data (), "__gnu_compiled"))
     return (NULL);
 
   if (symtab_create_debug >= 2)
-    printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %s\n",
-               mst_str (ms_type), hex_string (address), section, name);
+    printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %.*s\n",
+               mst_str (ms_type), hex_string (address), section,
+	       (int) name.size (), name.data ());
 
   if (m_msym_bunch_index == BUNCH_SIZE)
     {
@@ -1106,7 +1106,7 @@ minimal_symbol_reader::record_full (const char *name, int name_len,
   msymbol = &m_msym_bunch->contents[m_msym_bunch_index];
   symbol_set_language (msymbol, language_auto,
 		       &m_objfile->per_bfd->storage_obstack);
-  symbol_set_names (msymbol, name, name_len, copy_name, m_objfile->per_bfd);
+  symbol_set_names (msymbol, name, copy_name, m_objfile->per_bfd);
 
   SET_MSYMBOL_VALUE_ADDRESS (msymbol, address);
   MSYMBOL_SECTION (msymbol) = section;
diff --git a/gdb/minsyms.h b/gdb/minsyms.h
index ce4b83d544..f62a2b9914 100644
--- a/gdb/minsyms.h
+++ b/gdb/minsyms.h
@@ -88,7 +88,6 @@ class minimal_symbol_reader
      Arguments are:
 
      NAME - the symbol's name
-     NAME_LEN - the length of the name
      COPY_NAME - if true, the minsym code must make a copy of NAME.  If
      false, then NAME must be NUL-terminated, and must have a lifetime
      that is at least as long as OBJFILE's lifetime.
@@ -97,15 +96,14 @@ class minimal_symbol_reader
      SECTION - the symbol's section
   */
 
-  struct minimal_symbol *record_full (const char *name,
-				      int name_len,
+  struct minimal_symbol *record_full (gdb::string_view name,
 				      bool copy_name,
 				      CORE_ADDR address,
 				      enum minimal_symbol_type ms_type,
 				      int section);
 
   /* Like record_full, but:
-     - uses strlen to compute NAME_LEN,
+     - computes the length of NAME
      - passes COPY_NAME = true,
      - and passes a default SECTION, depending on the type
 
@@ -115,7 +113,7 @@ class minimal_symbol_reader
 	       enum minimal_symbol_type ms_type);
 
   /* Like record_full, but:
-     - uses strlen to compute NAME_LEN,
+     - computes the length of NAME
      - passes COPY_NAME = true.
 
      This variant does not return the new symbol.  */
@@ -124,7 +122,7 @@ class minimal_symbol_reader
 			 enum minimal_symbol_type ms_type,
 			 int section)
   {
-    record_full (name, strlen (name), true, address, ms_type, section);
+    record_full (name, true, address, ms_type, section);
   }
 
  private:
diff --git a/gdb/psympriv.h b/gdb/psympriv.h
index 3e89742d8d..9404c46837 100644
--- a/gdb/psympriv.h
+++ b/gdb/psympriv.h
@@ -22,6 +22,7 @@
 
 #include "psymtab.h"
 #include "objfiles.h"
+#include "gdbsupport/gdb_string_view.h"
 
 /* A partial_symbol records the name, domain, and address class of
    symbols whose types we have not parsed yet.  For functions, it also
@@ -304,14 +305,13 @@ enum class psymbol_placement
    LANGUAGE is the language from which the symbol originates.  This will
    influence, amongst other things, how the symbol name is demangled. */
 
-extern void add_psymbol_to_list (const char *name, int namelength,
-				 bool copy_name, domain_enum domain,
-				 enum address_class theclass,
-				 short section,
-				 psymbol_placement where,
-				 CORE_ADDR coreaddr,
-				 enum language language,
-				 struct objfile *objfile);
+extern void add_psymbol_to_list (gdb::string_view,
+				 bool, domain_enum,
+				 enum address_class,
+				 short /* section */,
+				 enum psymbol_placement,
+				 CORE_ADDR,
+				 enum language, struct objfile *);
 
 /* Initialize storage for partial symbols.  If partial symbol storage
    has already been initialized, this does nothing.  TOTAL_SYMBOLS is
diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index 31b6d59777..b30d29e6ef 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -1568,7 +1568,7 @@ psymbol_compare (const void *addr1, const void *addr2, int length)
    different domain (or address) is possible and correct.  */
 
 static struct partial_symbol *
-add_psymbol_to_bcache (const char *name, int namelength, bool copy_name,
+add_psymbol_to_bcache (gdb::string_view name, bool copy_name,
 		       domain_enum domain,
 		       enum address_class theclass,
 		       short section,
@@ -1585,7 +1585,7 @@ add_psymbol_to_bcache (const char *name, int namelength, bool copy_name,
   psymbol.aclass = theclass;
   symbol_set_language (&psymbol.ginfo, language,
 		       objfile->partial_symtabs->obstack ());
-  symbol_set_names (&psymbol.ginfo, name, namelength, copy_name,
+  symbol_set_names (&psymbol.ginfo, name, copy_name,
 		    objfile->per_bfd);
 
   /* Stash the partial symbol away in the cache.  */
@@ -1608,7 +1608,7 @@ append_psymbol_to_list (std::vector<partial_symbol *> *list,
 /* See psympriv.h.  */
 
 void
-add_psymbol_to_list (const char *name, int namelength, bool copy_name,
+add_psymbol_to_list (gdb::string_view name, bool copy_name,
 		     domain_enum domain,
 		     enum address_class theclass,
 		     short section,
@@ -1621,7 +1621,7 @@ add_psymbol_to_list (const char *name, int namelength, bool copy_name,
   int added;
 
   /* Stash the partial symbol away in the cache.  */
-  psym = add_psymbol_to_bcache (name, namelength, copy_name, domain, theclass,
+  psym = add_psymbol_to_bcache (name, copy_name, domain, theclass,
 				section, coreaddr, language, objfile, &added);
 
   /* Do not duplicate global partial symbols.  */
diff --git a/gdb/stabsread.c b/gdb/stabsread.c
index 48c88ded55..d8cb4a5264 100644
--- a/gdb/stabsread.c
+++ b/gdb/stabsread.c
@@ -751,11 +751,12 @@ define_symbol (CORE_ADDR valu, const char *string, int desc, int type,
       if (!new_name.empty ())
 	{
 	  SYMBOL_SET_NAMES (sym,
-			    new_name.c_str (), new_name.length (),
+			    new_name,
 			    1, objfile);
 	}
       else
-	SYMBOL_SET_NAMES (sym, string, p - string, 1, objfile);
+	SYMBOL_SET_NAMES (sym, gdb::string_view (string, p - string), true,
+			  objfile);
 
       if (SYMBOL_LANGUAGE (sym) == language_cplus)
 	cp_scan_for_anonymous_namespaces (get_buildsym_compunit (), sym,
diff --git a/gdb/symtab.c b/gdb/symtab.c
index 6ea9fc6971..16cb5b7c94 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -811,7 +811,7 @@ symbol_find_demangled_name (struct general_symbol_info *gsymbol,
 
 void
 symbol_set_names (struct general_symbol_info *gsymbol,
-		  const char *linkage_name, int len, bool copy_name,
+		  gdb::string_view linkage_name, bool copy_name,
 		  struct objfile_per_bfd_storage *per_bfd)
 {
   struct demangled_name_entry **slot;
@@ -824,14 +824,14 @@ symbol_set_names (struct general_symbol_info *gsymbol,
       /* In Ada, we do the symbol lookups using the mangled name, so
          we can save some space by not storing the demangled name.  */
       if (!copy_name)
-	gsymbol->name = linkage_name;
+	gsymbol->name = linkage_name.data ();
       else
 	{
 	  char *name = (char *) obstack_alloc (&per_bfd->storage_obstack,
-					       len + 1);
+					       linkage_name.length () + 1);
 
-	  memcpy (name, linkage_name, len);
-	  name[len] = '\0';
+	  memcpy (name, linkage_name.data (), linkage_name.length ());
+	  name[linkage_name.length ()] = '\0';
 	  gsymbol->name = name;
 	}
       symbol_set_demangled_name (gsymbol, NULL, &per_bfd->storage_obstack);
@@ -842,18 +842,18 @@ symbol_set_names (struct general_symbol_info *gsymbol,
   if (per_bfd->demangled_names_hash == NULL)
     create_demangled_names_hash (per_bfd);
 
-  if (linkage_name[len] != '\0')
+  if (linkage_name[linkage_name.length ()] != '\0')
     {
       char *alloc_name;
 
-      alloc_name = (char *) alloca (len + 1);
-      memcpy (alloc_name, linkage_name, len);
-      alloc_name[len] = '\0';
+      alloc_name = (char *) alloca (linkage_name.length () + 1);
+      memcpy (alloc_name, linkage_name.data (), linkage_name.length ());
+      alloc_name[linkage_name.length ()] = '\0';
 
       linkage_name_copy = alloc_name;
     }
   else
-    linkage_name_copy = linkage_name;
+    linkage_name_copy = linkage_name.data ();
 
   entry.mangled = linkage_name_copy;
   slot = ((struct demangled_name_entry **)
@@ -881,14 +881,14 @@ symbol_set_names (struct general_symbol_info *gsymbol,
 	 It turns out that it is actually important to still save such
 	 an entry in the hash table, because storing this name gives
 	 us better bcache hit rates for partial symbols.  */
-      if (!copy_name && linkage_name_copy == linkage_name)
+      if (!copy_name && linkage_name_copy == linkage_name.data ())
 	{
 	  *slot
 	    = ((struct demangled_name_entry *)
 	       obstack_alloc (&per_bfd->storage_obstack,
 			      offsetof (struct demangled_name_entry, demangled)
 			      + demangled_len + 1));
-	  (*slot)->mangled = linkage_name;
+	  (*slot)->mangled = linkage_name.data ();
 	}
       else
 	{
@@ -901,7 +901,7 @@ symbol_set_names (struct general_symbol_info *gsymbol,
 	    = ((struct demangled_name_entry *)
 	       obstack_alloc (&per_bfd->storage_obstack,
 			      offsetof (struct demangled_name_entry, demangled)
-			      + len + demangled_len + 2));
+			      + linkage_name.length () + demangled_len + 2));
 	  mangled_ptr = &((*slot)->demangled[demangled_len + 1]);
 	  strcpy (mangled_ptr, linkage_name_copy);
 	  (*slot)->mangled = mangled_ptr;
diff --git a/gdb/symtab.h b/gdb/symtab.h
index 1f0fc62a65..1546d83029 100644
--- a/gdb/symtab.h
+++ b/gdb/symtab.h
@@ -29,6 +29,7 @@
 #include "gdbsupport/enum-flags.h"
 #include "gdbsupport/function-view.h"
 #include "gdbsupport/gdb_optional.h"
+#include "gdbsupport/gdb_string_view.h"
 #include "gdbsupport/next-iterator.h"
 #include "completer.h"
 
@@ -493,11 +494,11 @@ extern void symbol_set_language (struct general_symbol_info *symbol,
 
 /* Set the linkage and natural names of a symbol, by demangling
    the linkage name.  */
-#define SYMBOL_SET_NAMES(symbol,linkage_name,len,copy_name,objfile)	\
-  symbol_set_names (&(symbol)->ginfo, linkage_name, len, copy_name, \
+#define SYMBOL_SET_NAMES(symbol,linkage_name,copy_name,objfile)	\
+  symbol_set_names (&(symbol)->ginfo, linkage_name, copy_name, \
 		    (objfile)->per_bfd)
 extern void symbol_set_names (struct general_symbol_info *symbol,
-			      const char *linkage_name, int len, bool copy_name,
+			      gdb::string_view linkage_name, bool copy_name,
 			      struct objfile_per_bfd_storage *per_bfd);
 
 /* Now come lots of name accessor macros.  Short version as to when to
diff --git a/gdb/xcoffread.c b/gdb/xcoffread.c
index 2fa2706653..52a700215d 100644
--- a/gdb/xcoffread.c
+++ b/gdb/xcoffread.c
@@ -2644,8 +2644,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		  namestring = gdbarch_static_transform_name
 				 (gdbarch, namestring);
 
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_STATIC,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_STATIC,
 				     SECT_OFF_DATA (objfile),
 				     psymbol_placement::STATIC,
 				     symbol.n_value,
@@ -2655,8 +2656,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 	      case 'G':
 		/* The addresses in these entries are reported to be
 		   wrong.  See the code that reads 'G's for symtabs.  */
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_STATIC,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_STATIC,
 				     SECT_OFF_DATA (objfile),
 				     psymbol_placement::GLOBAL,
 				     symbol.n_value,
@@ -2674,15 +2676,17 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		    || (p == namestring + 1
 			&& namestring[0] != ' '))
 		  {
-		    add_psymbol_to_list (namestring, p - namestring, true,
-					 STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+		    add_psymbol_to_list (gdb::string_view (namestring,
+							   p - namestring),
+					 true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 					 psymbol_placement::STATIC,
 					 0, psymtab_language, objfile);
 		    if (p[2] == 't')
 		      {
 			/* Also a typedef with the same name.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_TYPEDEF, -1,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
 			p += 1;
@@ -2693,8 +2697,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 	      case 't':
 		if (p != namestring)	/* a name is there, not just :T...  */
 		  {
-		    add_psymbol_to_list (namestring, p - namestring, true,
-					 VAR_DOMAIN, LOC_TYPEDEF, -1,
+		    add_psymbol_to_list (gdb::string_view (namestring,
+							   p - namestring),
+					 true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					 psymbol_placement::STATIC,
 					 0, psymtab_language, objfile);
 		  }
@@ -2755,7 +2760,7 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 			  ;
 			/* Note that the value doesn't matter for
 			   enum constants in psymtabs, just in symtabs.  */
-			add_psymbol_to_list (p, q - p, true,
+			add_psymbol_to_list (gdb::string_view (p, q - p), true,
 					     VAR_DOMAIN, LOC_CONST, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
@@ -2773,8 +2778,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 
 	      case 'c':
 		/* Constant, e.g. from "const" in Pascal.  */
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_CONST, -1,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_CONST, -1,
 				     psymbol_placement::STATIC,
 				     0, psymtab_language, objfile);
 		continue;
@@ -2790,8 +2796,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		    function_outside_compilation_unit_complaint (name);
 		    xfree (name);
 		  }
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_BLOCK,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_BLOCK,
 				     SECT_OFF_TEXT (objfile),
 				     psymbol_placement::STATIC,
 				     symbol.n_value,
@@ -2820,8 +2827,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		if (startswith (namestring, "@FIX"))
 		  continue;
 
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_BLOCK,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_BLOCK,
 				     SECT_OFF_TEXT (objfile),
 				     psymbol_placement::GLOBAL,
 				     symbol.n_value,
-- 
2.23.0.444.g18eeb5a265-goog

[PATCH v3] Change some arguments to gdb::string_view instead of name+len

[Christian Biesinger via gdb-patches]

[Oops, this version also does the substr (1) change]

Just some code cleanup. This change has a few benefits:
- Shorter argument list in the functions
- If the caller needs to calculate the string, they no longer
  need to explicitly call strlen
- It is easy to pass std::string to this (done in one place
  currently)

This also updates a couple of places that were passing 0/1 to
a bool parameter.

gdb/ChangeLog:

2019-09-29  Christian Biesinger  <cbiesinger@google.com>

	* coffread.c (record_minimal_symbol): Update.
	(process_coff_symbol): Update.
	* dbxread.c (read_dbx_symtab): Update.
	* dwarf2read.c (add_partial_symbol): Update.
	(fixup_go_packaging): Update.
	(load_partial_dies): Update.
	(new_symbol): Update.
	* elfread.c (record_minimal_symbol): Update.
	* mdebugread.c (parse_partial_symbols): Update.
	(handle_psymbol_enumerators): Update.
	(new_symbol): Update.
	* minsyms.c (minimal_symbol_reader::record_full): Change signature
	to use gdb::string_view instead of name+len.
	* minsyms.h (class minimal_symbol_reader) <record_full>: Likewise.
	* psympriv.h (add_psymbol_to_list): Likewise.
	* psymtab.c (add_psymbol_to_bcache): Likewise.
	(add_psymbol_to_list): Likewise.
	* stabsread.c (define_symbol): Update.
	* symtab.c (symbol_set_names): Change signature to use gdb::string_view.
	* symtab.h (SYMBOL_SET_NAMES): Likewise.
	(symbol_set_names): Likewise.
	* xcoffread.c (scan_xcoff_symtab): Update.
---
 gdb/coffread.c   |  5 ++-
 gdb/dbxread.c    | 24 +++++++--------
 gdb/dwarf2read.c | 29 +++++++++---------
 gdb/elfread.c    |  4 +--
 gdb/mdebugread.c | 80 ++++++++++++++++++++++++++----------------------
 gdb/minsyms.c    | 18 +++++------
 gdb/minsyms.h    | 10 +++---
 gdb/psympriv.h   | 16 +++++-----
 gdb/psymtab.c    |  8 ++---
 gdb/stabsread.c  |  5 +--
 gdb/symtab.c     | 26 ++++++++--------
 gdb/symtab.h     |  7 +++--
 gdb/xcoffread.c  | 42 +++++++++++++++----------
 13 files changed, 143 insertions(+), 131 deletions(-)

diff --git a/gdb/coffread.c b/gdb/coffread.c
index c44b69069e..52b9c57b9c 100644
--- a/gdb/coffread.c
+++ b/gdb/coffread.c
@@ -462,8 +462,7 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       return NULL;
     }
 
-  return reader.record_full (cs->c_name, strlen (cs->c_name), true, address,
-			     type, section);
+  return reader.record_full (cs->c_name, true, address, type, section);
 }
 \f
 /* coff_symfile_init ()
@@ -1569,7 +1568,7 @@ process_coff_symbol (struct coff_symbol *cs,
   name = EXTERNAL_NAME (name, objfile->obfd);
   SYMBOL_SET_LANGUAGE (sym, get_current_subfile ()->language,
 		       &objfile->objfile_obstack);
-  SYMBOL_SET_NAMES (sym, name, strlen (name), 1, objfile);
+  SYMBOL_SET_NAMES (sym, name, true, objfile);
 
   /* default assumptions */
   SYMBOL_VALUE (sym) = cs->c_value;
diff --git a/gdb/dbxread.c b/gdb/dbxread.c
index 564c5d3a41..16727ef108 100644
--- a/gdb/dbxread.c
+++ b/gdb/dbxread.c
@@ -1464,7 +1464,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	      if (gdbarch_static_transform_name_p (gdbarch))
 		gdbarch_static_transform_name (gdbarch, namestring);
 
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_STATIC,
 				   data_sect_index,
 				   psymbol_placement::STATIC,
@@ -1474,7 +1474,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	    case 'G':
 	      /* The addresses in these entries are reported to be
 		 wrong.  See the code that reads 'G's for symtabs.  */
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_STATIC,
 				   data_sect_index,
 				   psymbol_placement::GLOBAL,
@@ -1492,15 +1492,15 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  || (p == namestring + 1
 		      && namestring[0] != ' '))
 		{
-		  add_psymbol_to_list (sym_name, sym_len, true,
-				       STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+		  add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+				       true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 				       psymbol_placement::STATIC,
 				       0, psymtab_language, objfile);
 		  if (p[2] == 't')
 		    {
 		      /* Also a typedef with the same name.  */
-		      add_psymbol_to_list (sym_name, sym_len, true,
-					   VAR_DOMAIN, LOC_TYPEDEF, -1,
+		      add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+					   true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					   psymbol_placement::STATIC,
 					   0, psymtab_language, objfile);
 		      p += 1;
@@ -1511,8 +1511,8 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	    case 't':
 	      if (p != namestring)	/* a name is there, not just :T...  */
 		{
-		  add_psymbol_to_list (sym_name, sym_len, true,
-				       VAR_DOMAIN, LOC_TYPEDEF, -1,
+		  add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+				       true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 				       psymbol_placement::STATIC,
 				       0, psymtab_language, objfile);
 		}
@@ -1572,7 +1572,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 			;
 		      /* Note that the value doesn't matter for
 			 enum constants in psymtabs, just in symtabs.  */
-		      add_psymbol_to_list (p, q - p, true,
+		      add_psymbol_to_list (gdb::string_view (p, q - p), true,
 					   VAR_DOMAIN, LOC_CONST, -1,
 					   psymbol_placement::STATIC, 0,
 					   psymtab_language, objfile);
@@ -1590,7 +1590,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 
 	    case 'c':
 	      /* Constant, e.g. from "const" in Pascal.  */
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_CONST, -1,
 				   psymbol_placement::STATIC, 0,
 				   psymtab_language, objfile);
@@ -1645,7 +1645,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  pst->set_text_low (nlist.n_value);
 		  textlow_not_set = 0;
 		}
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_BLOCK,
 				   SECT_OFF_TEXT (objfile),
 				   psymbol_placement::STATIC,
@@ -1704,7 +1704,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  pst->set_text_low (nlist.n_value);
 		  textlow_not_set = 0;
 		}
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_BLOCK,
 				   SECT_OFF_TEXT (objfile),
 				   psymbol_placement::GLOBAL,
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 1052501c35..ff0fc7a06a 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -8922,7 +8922,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
              of the global scope.  But in Ada, we want to be able to access
              nested procedures globally.  So all Ada subprograms are stored
              in the global scope.  */
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_BLOCK,
 			       SECT_OFF_TEXT (objfile),
@@ -8932,7 +8932,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	}
       else
 	{
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_BLOCK,
 			       SECT_OFF_TEXT (objfile),
@@ -8944,7 +8944,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	set_objfile_main_name (objfile, actual_name, cu->language);
       break;
     case DW_TAG_constant:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
 			   -1, (pdi->is_external
 				? psymbol_placement::GLOBAL
@@ -8980,7 +8980,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	     table building.  */
 
 	  if (pdi->d.locdesc || pdi->has_type)
-	    add_psymbol_to_list (actual_name, strlen (actual_name),
+	    add_psymbol_to_list (actual_name,
 				 built_actual_name != NULL,
 				 VAR_DOMAIN, LOC_STATIC,
 				 SECT_OFF_TEXT (objfile),
@@ -8999,7 +8999,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	      return;
 	    }
 
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_STATIC,
 			       SECT_OFF_TEXT (objfile),
@@ -9011,7 +9011,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
     case DW_TAG_typedef:
     case DW_TAG_base_type:
     case DW_TAG_subrange_type:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_TYPEDEF, -1,
 			   psymbol_placement::STATIC,
@@ -9019,7 +9019,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
       break;
     case DW_TAG_imported_declaration:
     case DW_TAG_namespace:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_TYPEDEF, -1,
 			   psymbol_placement::GLOBAL,
@@ -9030,7 +9030,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
          available without any name.  If so, we skip the module as it
          doesn't bring any value.  */
       if (actual_name != nullptr)
-	add_psymbol_to_list (actual_name, strlen (actual_name),
+	add_psymbol_to_list (actual_name,
 			     built_actual_name != NULL,
 			     MODULE_DOMAIN, LOC_TYPEDEF, -1,
 			     psymbol_placement::GLOBAL,
@@ -9054,7 +9054,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 
       /* NOTE: carlton/2003-10-07: See comment in new_symbol about
 	 static vs. global.  */
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 			   cu->language == language_cplus
@@ -9064,7 +9064,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 
       break;
     case DW_TAG_enumerator:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_CONST, -1,
 			   cu->language == language_cplus
@@ -9888,8 +9888,7 @@ fixup_go_packaging (struct dwarf2_cu *cu)
 
       sym = allocate_symbol (objfile);
       SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
-      SYMBOL_SET_NAMES (sym, saved_package_name,
-			strlen (saved_package_name), 0, objfile);
+      SYMBOL_SET_NAMES (sym, saved_package_name, false, objfile);
       /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
 	 e.g., "main" finds the "main" module and not C's main().  */
       SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
@@ -18533,7 +18532,7 @@ load_partial_dies (const struct die_reader_specs *reader,
 	      || pdi.tag == DW_TAG_subrange_type))
 	{
 	  if (building_psymtab && pdi.name != NULL)
-	    add_psymbol_to_list (pdi.name, strlen (pdi.name), false,
+	    add_psymbol_to_list (pdi.name, false,
 				 VAR_DOMAIN, LOC_TYPEDEF, -1,
 				 psymbol_placement::STATIC,
 				 0, cu->language, objfile);
@@ -18567,7 +18566,7 @@ load_partial_dies (const struct die_reader_specs *reader,
 	  if (pdi.name == NULL)
 	    complaint (_("malformed enumerator DIE ignored"));
 	  else if (building_psymtab)
-	    add_psymbol_to_list (pdi.name, strlen (pdi.name), false,
+	    add_psymbol_to_list (pdi.name, false,
 				 VAR_DOMAIN, LOC_CONST, -1,
 				 cu->language == language_cplus
 				 ? psymbol_placement::GLOBAL
@@ -21551,7 +21550,7 @@ new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
       /* Cache this symbol's name and the name's demangled form (if any).  */
       SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
       linkagename = dwarf2_physname (name, die, cu);
-      SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
+      SYMBOL_SET_NAMES (sym, linkagename, false, objfile);
 
       /* Fortran does not have mangling standard and the mangling does differ
 	 between gfortran, iFort etc.  */
diff --git a/gdb/elfread.c b/gdb/elfread.c
index a3d17e54a2..04b36d3dba 100644
--- a/gdb/elfread.c
+++ b/gdb/elfread.c
@@ -203,8 +203,8 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       || ms_type == mst_text_gnu_ifunc)
     address = gdbarch_addr_bits_remove (gdbarch, address);
 
-  return reader.record_full (name, name_len, copy_name, address,
-			     ms_type,
+  return reader.record_full (gdb::string_view (name, name_len), copy_name,
+			     address, ms_type,
 			     gdb_bfd_section_index (objfile->obfd,
 						    bfd_section));
 }
diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index 0956fbdb67..5921251f65 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -3048,8 +3048,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			  namestring = gdbarch_static_transform_name
 					 (gdbarch, namestring);
 
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_STATIC,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_STATIC,
 					     SECT_OFF_DATA (objfile),
 					     psymbol_placement::STATIC,
 					     sh.value,
@@ -3059,8 +3060,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			/* The addresses in these entries are reported
 			   to be wrong.  See the code that reads 'G's
 			   for symtabs.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_STATIC,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_STATIC,
 					     SECT_OFF_DATA (objfile),
 					     psymbol_placement::GLOBAL,
 					     sh.value,
@@ -3078,21 +3080,20 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    || (p == namestring + 1
 				&& namestring[0] != ' '))
 			  {
-			    add_psymbol_to_list (namestring, p - namestring, true,
-						 STRUCT_DOMAIN, LOC_TYPEDEF,
-						 -1,
-						 psymbol_placement::STATIC,
-						 0, psymtab_language, objfile);
+			    add_psymbol_to_list
+			      (gdb::string_view (namestring, p - namestring),
+			       true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+			       psymbol_placement::STATIC, 0, psymtab_language,
+			       objfile);
 			    if (p[2] == 't')
 			      {
 				/* Also a typedef with the same name.  */
-				add_psymbol_to_list (namestring,
-						     p - namestring, true,
-						     VAR_DOMAIN, LOC_TYPEDEF,
-						     -1,
-						     psymbol_placement::STATIC,
-						     0, psymtab_language,
-						     objfile);
+				add_psymbol_to_list
+				  (gdb::string_view (namestring,
+						     p - namestring),
+				   true, VAR_DOMAIN, LOC_TYPEDEF, -1,
+				   psymbol_placement::STATIC, 0,
+				   psymtab_language, objfile);
 				p += 1;
 			      }
 			  }
@@ -3101,11 +3102,12 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			if (p != namestring)	/* a name is there, not
 						   just :T...  */
 			  {
-			    add_psymbol_to_list (namestring, p - namestring,
-						 true, VAR_DOMAIN, LOC_TYPEDEF,
-						 -1,
-						 psymbol_placement::STATIC,
-						 0, psymtab_language, objfile);
+			    add_psymbol_to_list
+			      (gdb::string_view (namestring,
+						 p - namestring),
+			       true, VAR_DOMAIN, LOC_TYPEDEF, -1,
+			       psymbol_placement::STATIC, 0, psymtab_language,
+			       objfile);
 			  }
 		      check_enum:
 			/* If this is an enumerated type, we need to add
@@ -3166,9 +3168,10 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 				/* Note that the value doesn't matter for
 				   enum constants in psymtabs, just in
 				   symtabs.  */
-				add_psymbol_to_list (p, q - p, true,
-						     VAR_DOMAIN, LOC_CONST,
-						     -1,
+				add_psymbol_to_list (gdb::string_view (p,
+								       q - p),
+						     true, VAR_DOMAIN,
+						     LOC_CONST, -1,
 						     psymbol_placement::STATIC,
 						     0, psymtab_language,
 						     objfile);
@@ -3185,8 +3188,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			continue;
 		      case 'c':
 			/* Constant, e.g. from "const" in Pascal.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_CONST, -1,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_CONST, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
 			continue;
@@ -3198,8 +3202,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    function_outside_compilation_unit_complaint
 			      (copy.c_str ());
 			  }
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_BLOCK,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_BLOCK,
 					     SECT_OFF_TEXT (objfile),
 					     psymbol_placement::STATIC,
 					     sh.value,
@@ -3217,8 +3222,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    function_outside_compilation_unit_complaint
 			      (copy.c_str ());
 			  }
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_BLOCK,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_BLOCK,
 					     SECT_OFF_TEXT (objfile),
 					     psymbol_placement::GLOBAL,
 					     sh.value,
@@ -3452,13 +3458,13 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		     symbol table, and the MAIN__ symbol via the minimal
 		     symbol table.  */
 		  if (sh.st == stProc)
-		    add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		    add_psymbol_to_list (sym_name, true,
 					 VAR_DOMAIN, LOC_BLOCK,
 					 section,
 					 psymbol_placement::GLOBAL,
 					 sh.value, psymtab_language, objfile);
 		  else
-		    add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		    add_psymbol_to_list (sym_name, true,
 					 VAR_DOMAIN, LOC_BLOCK,
 					 section,
 					 psymbol_placement::STATIC,
@@ -3525,7 +3531,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		      && sh.iss != 0
 		      && sh.index != cur_sdx + 2)
 		    {
-		      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		      add_psymbol_to_list (sym_name, true,
 					   STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 					   psymbol_placement::STATIC,
 					   0, psymtab_language, objfile);
@@ -3565,7 +3571,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		  continue;
 		}
 	      /* Use this gdb symbol.  */
-	      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+	      add_psymbol_to_list (sym_name, true,
 				   VAR_DOMAIN, theclass, section,
 				   psymbol_placement::STATIC,
 				   sh.value, psymtab_language, objfile);
@@ -3644,7 +3650,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		  break;
 		}
 	      char *sym_name = debug_info->ssext + psh->iss;
-	      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+	      add_psymbol_to_list (sym_name, true,
 				   VAR_DOMAIN, theclass,
 				   section,
 				   psymbol_placement::GLOBAL,
@@ -3807,7 +3813,7 @@ handle_psymbol_enumerators (struct objfile *objfile, FDR *fh, int stype,
 
       /* Note that the value doesn't matter for enum constants
          in psymtabs, just in symtabs.  */
-      add_psymbol_to_list (name, strlen (name), true,
+      add_psymbol_to_list (name, true,
 			   VAR_DOMAIN, LOC_CONST, -1,
 			   psymbol_placement::STATIC, 0,
 			   psymtab_language, objfile);
@@ -4758,7 +4764,7 @@ new_symbol (const char *name)
 
   SYMBOL_SET_LANGUAGE (s, psymtab_language,
 		       &mdebugread_objfile->objfile_obstack);
-  SYMBOL_SET_NAMES (s, name, strlen (name), 1, mdebugread_objfile);
+  SYMBOL_SET_NAMES (s, name, true, mdebugread_objfile);
   return s;
 }
 
diff --git a/gdb/minsyms.c b/gdb/minsyms.c
index 83f5d89577..06825d4dc7 100644
--- a/gdb/minsyms.c
+++ b/gdb/minsyms.c
@@ -1063,7 +1063,7 @@ mst_str (minimal_symbol_type t)
 /* See minsyms.h.  */
 
 struct minimal_symbol *
-minimal_symbol_reader::record_full (const char *name, int name_len,
+minimal_symbol_reader::record_full (gdb::string_view name,
 				    bool copy_name, CORE_ADDR address,
 				    enum minimal_symbol_type ms_type,
 				    int section)
@@ -1077,24 +1077,24 @@ minimal_symbol_reader::record_full (const char *name, int name_len,
      lookup_minimal_symbol_by_pc would have no way of getting the
      right one.  */
   if (ms_type == mst_file_text && name[0] == 'g'
-      && (strcmp (name, GCC_COMPILED_FLAG_SYMBOL) == 0
-	  || strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0))
+      && (strcmp (name.data (), GCC_COMPILED_FLAG_SYMBOL) == 0
+	  || strcmp (name.data (), GCC2_COMPILED_FLAG_SYMBOL) == 0))
     return (NULL);
 
   /* It's safe to strip the leading char here once, since the name
      is also stored stripped in the minimal symbol table.  */
   if (name[0] == get_symbol_leading_char (m_objfile->obfd))
     {
-      ++name;
-      --name_len;
+      name = name.substr (1);
     }
 
-  if (ms_type == mst_file_text && startswith (name, "__gnu_compiled"))
+  if (ms_type == mst_file_text && startswith (name.data (), "__gnu_compiled"))
     return (NULL);
 
   if (symtab_create_debug >= 2)
-    printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %s\n",
-               mst_str (ms_type), hex_string (address), section, name);
+    printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %.*s\n",
+               mst_str (ms_type), hex_string (address), section,
+	       (int) name.size (), name.data ());
 
   if (m_msym_bunch_index == BUNCH_SIZE)
     {
@@ -1106,7 +1106,7 @@ minimal_symbol_reader::record_full (const char *name, int name_len,
   msymbol = &m_msym_bunch->contents[m_msym_bunch_index];
   symbol_set_language (msymbol, language_auto,
 		       &m_objfile->per_bfd->storage_obstack);
-  symbol_set_names (msymbol, name, name_len, copy_name, m_objfile->per_bfd);
+  symbol_set_names (msymbol, name, copy_name, m_objfile->per_bfd);
 
   SET_MSYMBOL_VALUE_ADDRESS (msymbol, address);
   MSYMBOL_SECTION (msymbol) = section;
diff --git a/gdb/minsyms.h b/gdb/minsyms.h
index ce4b83d544..f62a2b9914 100644
--- a/gdb/minsyms.h
+++ b/gdb/minsyms.h
@@ -88,7 +88,6 @@ class minimal_symbol_reader
      Arguments are:
 
      NAME - the symbol's name
-     NAME_LEN - the length of the name
      COPY_NAME - if true, the minsym code must make a copy of NAME.  If
      false, then NAME must be NUL-terminated, and must have a lifetime
      that is at least as long as OBJFILE's lifetime.
@@ -97,15 +96,14 @@ class minimal_symbol_reader
      SECTION - the symbol's section
   */
 
-  struct minimal_symbol *record_full (const char *name,
-				      int name_len,
+  struct minimal_symbol *record_full (gdb::string_view name,
 				      bool copy_name,
 				      CORE_ADDR address,
 				      enum minimal_symbol_type ms_type,
 				      int section);
 
   /* Like record_full, but:
-     - uses strlen to compute NAME_LEN,
+     - computes the length of NAME
      - passes COPY_NAME = true,
      - and passes a default SECTION, depending on the type
 
@@ -115,7 +113,7 @@ class minimal_symbol_reader
 	       enum minimal_symbol_type ms_type);
 
   /* Like record_full, but:
-     - uses strlen to compute NAME_LEN,
+     - computes the length of NAME
      - passes COPY_NAME = true.
 
      This variant does not return the new symbol.  */
@@ -124,7 +122,7 @@ class minimal_symbol_reader
 			 enum minimal_symbol_type ms_type,
 			 int section)
   {
-    record_full (name, strlen (name), true, address, ms_type, section);
+    record_full (name, true, address, ms_type, section);
   }
 
  private:
diff --git a/gdb/psympriv.h b/gdb/psympriv.h
index 3e89742d8d..9404c46837 100644
--- a/gdb/psympriv.h
+++ b/gdb/psympriv.h
@@ -22,6 +22,7 @@
 
 #include "psymtab.h"
 #include "objfiles.h"
+#include "gdbsupport/gdb_string_view.h"
 
 /* A partial_symbol records the name, domain, and address class of
    symbols whose types we have not parsed yet.  For functions, it also
@@ -304,14 +305,13 @@ enum class psymbol_placement
    LANGUAGE is the language from which the symbol originates.  This will
    influence, amongst other things, how the symbol name is demangled. */
 
-extern void add_psymbol_to_list (const char *name, int namelength,
-				 bool copy_name, domain_enum domain,
-				 enum address_class theclass,
-				 short section,
-				 psymbol_placement where,
-				 CORE_ADDR coreaddr,
-				 enum language language,
-				 struct objfile *objfile);
+extern void add_psymbol_to_list (gdb::string_view,
+				 bool, domain_enum,
+				 enum address_class,
+				 short /* section */,
+				 enum psymbol_placement,
+				 CORE_ADDR,
+				 enum language, struct objfile *);
 
 /* Initialize storage for partial symbols.  If partial symbol storage
    has already been initialized, this does nothing.  TOTAL_SYMBOLS is
diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index 31b6d59777..b30d29e6ef 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -1568,7 +1568,7 @@ psymbol_compare (const void *addr1, const void *addr2, int length)
    different domain (or address) is possible and correct.  */
 
 static struct partial_symbol *
-add_psymbol_to_bcache (const char *name, int namelength, bool copy_name,
+add_psymbol_to_bcache (gdb::string_view name, bool copy_name,
 		       domain_enum domain,
 		       enum address_class theclass,
 		       short section,
@@ -1585,7 +1585,7 @@ add_psymbol_to_bcache (const char *name, int namelength, bool copy_name,
   psymbol.aclass = theclass;
   symbol_set_language (&psymbol.ginfo, language,
 		       objfile->partial_symtabs->obstack ());
-  symbol_set_names (&psymbol.ginfo, name, namelength, copy_name,
+  symbol_set_names (&psymbol.ginfo, name, copy_name,
 		    objfile->per_bfd);
 
   /* Stash the partial symbol away in the cache.  */
@@ -1608,7 +1608,7 @@ append_psymbol_to_list (std::vector<partial_symbol *> *list,
 /* See psympriv.h.  */
 
 void
-add_psymbol_to_list (const char *name, int namelength, bool copy_name,
+add_psymbol_to_list (gdb::string_view name, bool copy_name,
 		     domain_enum domain,
 		     enum address_class theclass,
 		     short section,
@@ -1621,7 +1621,7 @@ add_psymbol_to_list (const char *name, int namelength, bool copy_name,
   int added;
 
   /* Stash the partial symbol away in the cache.  */
-  psym = add_psymbol_to_bcache (name, namelength, copy_name, domain, theclass,
+  psym = add_psymbol_to_bcache (name, copy_name, domain, theclass,
 				section, coreaddr, language, objfile, &added);
 
   /* Do not duplicate global partial symbols.  */
diff --git a/gdb/stabsread.c b/gdb/stabsread.c
index 48c88ded55..d8cb4a5264 100644
--- a/gdb/stabsread.c
+++ b/gdb/stabsread.c
@@ -751,11 +751,12 @@ define_symbol (CORE_ADDR valu, const char *string, int desc, int type,
       if (!new_name.empty ())
 	{
 	  SYMBOL_SET_NAMES (sym,
-			    new_name.c_str (), new_name.length (),
+			    new_name,
 			    1, objfile);
 	}
       else
-	SYMBOL_SET_NAMES (sym, string, p - string, 1, objfile);
+	SYMBOL_SET_NAMES (sym, gdb::string_view (string, p - string), true,
+			  objfile);
 
       if (SYMBOL_LANGUAGE (sym) == language_cplus)
 	cp_scan_for_anonymous_namespaces (get_buildsym_compunit (), sym,
diff --git a/gdb/symtab.c b/gdb/symtab.c
index 6ea9fc6971..16cb5b7c94 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -811,7 +811,7 @@ symbol_find_demangled_name (struct general_symbol_info *gsymbol,
 
 void
 symbol_set_names (struct general_symbol_info *gsymbol,
-		  const char *linkage_name, int len, bool copy_name,
+		  gdb::string_view linkage_name, bool copy_name,
 		  struct objfile_per_bfd_storage *per_bfd)
 {
   struct demangled_name_entry **slot;
@@ -824,14 +824,14 @@ symbol_set_names (struct general_symbol_info *gsymbol,
       /* In Ada, we do the symbol lookups using the mangled name, so
          we can save some space by not storing the demangled name.  */
       if (!copy_name)
-	gsymbol->name = linkage_name;
+	gsymbol->name = linkage_name.data ();
       else
 	{
 	  char *name = (char *) obstack_alloc (&per_bfd->storage_obstack,
-					       len + 1);
+					       linkage_name.length () + 1);
 
-	  memcpy (name, linkage_name, len);
-	  name[len] = '\0';
+	  memcpy (name, linkage_name.data (), linkage_name.length ());
+	  name[linkage_name.length ()] = '\0';
 	  gsymbol->name = name;
 	}
       symbol_set_demangled_name (gsymbol, NULL, &per_bfd->storage_obstack);
@@ -842,18 +842,18 @@ symbol_set_names (struct general_symbol_info *gsymbol,
   if (per_bfd->demangled_names_hash == NULL)
     create_demangled_names_hash (per_bfd);
 
-  if (linkage_name[len] != '\0')
+  if (linkage_name[linkage_name.length ()] != '\0')
     {
       char *alloc_name;
 
-      alloc_name = (char *) alloca (len + 1);
-      memcpy (alloc_name, linkage_name, len);
-      alloc_name[len] = '\0';
+      alloc_name = (char *) alloca (linkage_name.length () + 1);
+      memcpy (alloc_name, linkage_name.data (), linkage_name.length ());
+      alloc_name[linkage_name.length ()] = '\0';
 
       linkage_name_copy = alloc_name;
     }
   else
-    linkage_name_copy = linkage_name;
+    linkage_name_copy = linkage_name.data ();
 
   entry.mangled = linkage_name_copy;
   slot = ((struct demangled_name_entry **)
@@ -881,14 +881,14 @@ symbol_set_names (struct general_symbol_info *gsymbol,
 	 It turns out that it is actually important to still save such
 	 an entry in the hash table, because storing this name gives
 	 us better bcache hit rates for partial symbols.  */
-      if (!copy_name && linkage_name_copy == linkage_name)
+      if (!copy_name && linkage_name_copy == linkage_name.data ())
 	{
 	  *slot
 	    = ((struct demangled_name_entry *)
 	       obstack_alloc (&per_bfd->storage_obstack,
 			      offsetof (struct demangled_name_entry, demangled)
 			      + demangled_len + 1));
-	  (*slot)->mangled = linkage_name;
+	  (*slot)->mangled = linkage_name.data ();
 	}
       else
 	{
@@ -901,7 +901,7 @@ symbol_set_names (struct general_symbol_info *gsymbol,
 	    = ((struct demangled_name_entry *)
 	       obstack_alloc (&per_bfd->storage_obstack,
 			      offsetof (struct demangled_name_entry, demangled)
-			      + len + demangled_len + 2));
+			      + linkage_name.length () + demangled_len + 2));
 	  mangled_ptr = &((*slot)->demangled[demangled_len + 1]);
 	  strcpy (mangled_ptr, linkage_name_copy);
 	  (*slot)->mangled = mangled_ptr;
diff --git a/gdb/symtab.h b/gdb/symtab.h
index 1f0fc62a65..1546d83029 100644
--- a/gdb/symtab.h
+++ b/gdb/symtab.h
@@ -29,6 +29,7 @@
 #include "gdbsupport/enum-flags.h"
 #include "gdbsupport/function-view.h"
 #include "gdbsupport/gdb_optional.h"
+#include "gdbsupport/gdb_string_view.h"
 #include "gdbsupport/next-iterator.h"
 #include "completer.h"
 
@@ -493,11 +494,11 @@ extern void symbol_set_language (struct general_symbol_info *symbol,
 
 /* Set the linkage and natural names of a symbol, by demangling
    the linkage name.  */
-#define SYMBOL_SET_NAMES(symbol,linkage_name,len,copy_name,objfile)	\
-  symbol_set_names (&(symbol)->ginfo, linkage_name, len, copy_name, \
+#define SYMBOL_SET_NAMES(symbol,linkage_name,copy_name,objfile)	\
+  symbol_set_names (&(symbol)->ginfo, linkage_name, copy_name, \
 		    (objfile)->per_bfd)
 extern void symbol_set_names (struct general_symbol_info *symbol,
-			      const char *linkage_name, int len, bool copy_name,
+			      gdb::string_view linkage_name, bool copy_name,
 			      struct objfile_per_bfd_storage *per_bfd);
 
 /* Now come lots of name accessor macros.  Short version as to when to
diff --git a/gdb/xcoffread.c b/gdb/xcoffread.c
index 2fa2706653..52a700215d 100644
--- a/gdb/xcoffread.c
+++ b/gdb/xcoffread.c
@@ -2644,8 +2644,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		  namestring = gdbarch_static_transform_name
 				 (gdbarch, namestring);
 
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_STATIC,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_STATIC,
 				     SECT_OFF_DATA (objfile),
 				     psymbol_placement::STATIC,
 				     symbol.n_value,
@@ -2655,8 +2656,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 	      case 'G':
 		/* The addresses in these entries are reported to be
 		   wrong.  See the code that reads 'G's for symtabs.  */
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_STATIC,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_STATIC,
 				     SECT_OFF_DATA (objfile),
 				     psymbol_placement::GLOBAL,
 				     symbol.n_value,
@@ -2674,15 +2676,17 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		    || (p == namestring + 1
 			&& namestring[0] != ' '))
 		  {
-		    add_psymbol_to_list (namestring, p - namestring, true,
-					 STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+		    add_psymbol_to_list (gdb::string_view (namestring,
+							   p - namestring),
+					 true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 					 psymbol_placement::STATIC,
 					 0, psymtab_language, objfile);
 		    if (p[2] == 't')
 		      {
 			/* Also a typedef with the same name.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_TYPEDEF, -1,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
 			p += 1;
@@ -2693,8 +2697,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 	      case 't':
 		if (p != namestring)	/* a name is there, not just :T...  */
 		  {
-		    add_psymbol_to_list (namestring, p - namestring, true,
-					 VAR_DOMAIN, LOC_TYPEDEF, -1,
+		    add_psymbol_to_list (gdb::string_view (namestring,
+							   p - namestring),
+					 true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					 psymbol_placement::STATIC,
 					 0, psymtab_language, objfile);
 		  }
@@ -2755,7 +2760,7 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 			  ;
 			/* Note that the value doesn't matter for
 			   enum constants in psymtabs, just in symtabs.  */
-			add_psymbol_to_list (p, q - p, true,
+			add_psymbol_to_list (gdb::string_view (p, q - p), true,
 					     VAR_DOMAIN, LOC_CONST, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
@@ -2773,8 +2778,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 
 	      case 'c':
 		/* Constant, e.g. from "const" in Pascal.  */
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_CONST, -1,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_CONST, -1,
 				     psymbol_placement::STATIC,
 				     0, psymtab_language, objfile);
 		continue;
@@ -2790,8 +2796,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		    function_outside_compilation_unit_complaint (name);
 		    xfree (name);
 		  }
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_BLOCK,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_BLOCK,
 				     SECT_OFF_TEXT (objfile),
 				     psymbol_placement::STATIC,
 				     symbol.n_value,
@@ -2820,8 +2827,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		if (startswith (namestring, "@FIX"))
 		  continue;
 
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_BLOCK,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_BLOCK,
 				     SECT_OFF_TEXT (objfile),
 				     psymbol_placement::GLOBAL,
 				     symbol.n_value,
-- 
2.23.0.444.g18eeb5a265-goog

[PATCH v4] Change some arguments to gdb::string_view instead of name+len

[Christian Biesinger via gdb-patches]

[This version also replaces an instance of strcmp with string_view's
operator==, so that the length is correctly respected]

Just some code cleanup. This change has a few benefits:
- Shorter argument list in the functions
- If the caller needs to calculate the string, they no longer
  need to explicitly call strlen
- It is easy to pass std::string to this (done in one place
  currently)

This also updates a couple of places that were passing 0/1 to
a bool parameter.

gdb/ChangeLog:

2019-09-29  Christian Biesinger  <cbiesinger@google.com>

	* coffread.c (record_minimal_symbol): Update.
	(process_coff_symbol): Update.
	* dbxread.c (read_dbx_symtab): Update.
	* dwarf2read.c (add_partial_symbol): Update.
	(fixup_go_packaging): Update.
	(load_partial_dies): Update.
	(new_symbol): Update.
	* elfread.c (record_minimal_symbol): Update.
	* mdebugread.c (parse_partial_symbols): Update.
	(handle_psymbol_enumerators): Update.
	(new_symbol): Update.
	* minsyms.c (minimal_symbol_reader::record_full): Change signature
	to use gdb::string_view instead of name+len.
	* minsyms.h (class minimal_symbol_reader) <record_full>: Likewise.
	* psympriv.h (add_psymbol_to_list): Likewise.
	* psymtab.c (add_psymbol_to_bcache): Likewise.
	(add_psymbol_to_list): Likewise.
	* stabsread.c (define_symbol): Update.
	* symtab.c (symbol_set_names): Change signature to use gdb::string_view.
	* symtab.h (SYMBOL_SET_NAMES): Likewise.
	(symbol_set_names): Likewise.
	* xcoffread.c (scan_xcoff_symtab): Update.
---
 gdb/coffread.c   |  5 ++-
 gdb/dbxread.c    | 24 +++++++--------
 gdb/dwarf2read.c | 29 +++++++++---------
 gdb/elfread.c    |  4 +--
 gdb/mdebugread.c | 80 ++++++++++++++++++++++++++----------------------
 gdb/minsyms.c    | 20 ++++++------
 gdb/minsyms.h    | 10 +++---
 gdb/psympriv.h   | 16 +++++-----
 gdb/psymtab.c    |  8 ++---
 gdb/stabsread.c  |  5 +--
 gdb/symtab.c     | 26 ++++++++--------
 gdb/symtab.h     |  7 +++--
 gdb/xcoffread.c  | 42 +++++++++++++++----------
 13 files changed, 143 insertions(+), 133 deletions(-)

diff --git a/gdb/coffread.c b/gdb/coffread.c
index c44b69069e..52b9c57b9c 100644
--- a/gdb/coffread.c
+++ b/gdb/coffread.c
@@ -462,8 +462,7 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       return NULL;
     }
 
-  return reader.record_full (cs->c_name, strlen (cs->c_name), true, address,
-			     type, section);
+  return reader.record_full (cs->c_name, true, address, type, section);
 }
 \f
 /* coff_symfile_init ()
@@ -1569,7 +1568,7 @@ process_coff_symbol (struct coff_symbol *cs,
   name = EXTERNAL_NAME (name, objfile->obfd);
   SYMBOL_SET_LANGUAGE (sym, get_current_subfile ()->language,
 		       &objfile->objfile_obstack);
-  SYMBOL_SET_NAMES (sym, name, strlen (name), 1, objfile);
+  SYMBOL_SET_NAMES (sym, name, true, objfile);
 
   /* default assumptions */
   SYMBOL_VALUE (sym) = cs->c_value;
diff --git a/gdb/dbxread.c b/gdb/dbxread.c
index 564c5d3a41..16727ef108 100644
--- a/gdb/dbxread.c
+++ b/gdb/dbxread.c
@@ -1464,7 +1464,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	      if (gdbarch_static_transform_name_p (gdbarch))
 		gdbarch_static_transform_name (gdbarch, namestring);
 
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_STATIC,
 				   data_sect_index,
 				   psymbol_placement::STATIC,
@@ -1474,7 +1474,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	    case 'G':
 	      /* The addresses in these entries are reported to be
 		 wrong.  See the code that reads 'G's for symtabs.  */
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_STATIC,
 				   data_sect_index,
 				   psymbol_placement::GLOBAL,
@@ -1492,15 +1492,15 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  || (p == namestring + 1
 		      && namestring[0] != ' '))
 		{
-		  add_psymbol_to_list (sym_name, sym_len, true,
-				       STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+		  add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+				       true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 				       psymbol_placement::STATIC,
 				       0, psymtab_language, objfile);
 		  if (p[2] == 't')
 		    {
 		      /* Also a typedef with the same name.  */
-		      add_psymbol_to_list (sym_name, sym_len, true,
-					   VAR_DOMAIN, LOC_TYPEDEF, -1,
+		      add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+					   true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					   psymbol_placement::STATIC,
 					   0, psymtab_language, objfile);
 		      p += 1;
@@ -1511,8 +1511,8 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	    case 't':
 	      if (p != namestring)	/* a name is there, not just :T...  */
 		{
-		  add_psymbol_to_list (sym_name, sym_len, true,
-				       VAR_DOMAIN, LOC_TYPEDEF, -1,
+		  add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+				       true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 				       psymbol_placement::STATIC,
 				       0, psymtab_language, objfile);
 		}
@@ -1572,7 +1572,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 			;
 		      /* Note that the value doesn't matter for
 			 enum constants in psymtabs, just in symtabs.  */
-		      add_psymbol_to_list (p, q - p, true,
+		      add_psymbol_to_list (gdb::string_view (p, q - p), true,
 					   VAR_DOMAIN, LOC_CONST, -1,
 					   psymbol_placement::STATIC, 0,
 					   psymtab_language, objfile);
@@ -1590,7 +1590,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 
 	    case 'c':
 	      /* Constant, e.g. from "const" in Pascal.  */
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_CONST, -1,
 				   psymbol_placement::STATIC, 0,
 				   psymtab_language, objfile);
@@ -1645,7 +1645,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  pst->set_text_low (nlist.n_value);
 		  textlow_not_set = 0;
 		}
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_BLOCK,
 				   SECT_OFF_TEXT (objfile),
 				   psymbol_placement::STATIC,
@@ -1704,7 +1704,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  pst->set_text_low (nlist.n_value);
 		  textlow_not_set = 0;
 		}
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_BLOCK,
 				   SECT_OFF_TEXT (objfile),
 				   psymbol_placement::GLOBAL,
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 1052501c35..ff0fc7a06a 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -8922,7 +8922,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
              of the global scope.  But in Ada, we want to be able to access
              nested procedures globally.  So all Ada subprograms are stored
              in the global scope.  */
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_BLOCK,
 			       SECT_OFF_TEXT (objfile),
@@ -8932,7 +8932,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	}
       else
 	{
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_BLOCK,
 			       SECT_OFF_TEXT (objfile),
@@ -8944,7 +8944,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	set_objfile_main_name (objfile, actual_name, cu->language);
       break;
     case DW_TAG_constant:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
 			   -1, (pdi->is_external
 				? psymbol_placement::GLOBAL
@@ -8980,7 +8980,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	     table building.  */
 
 	  if (pdi->d.locdesc || pdi->has_type)
-	    add_psymbol_to_list (actual_name, strlen (actual_name),
+	    add_psymbol_to_list (actual_name,
 				 built_actual_name != NULL,
 				 VAR_DOMAIN, LOC_STATIC,
 				 SECT_OFF_TEXT (objfile),
@@ -8999,7 +8999,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	      return;
 	    }
 
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_STATIC,
 			       SECT_OFF_TEXT (objfile),
@@ -9011,7 +9011,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
     case DW_TAG_typedef:
     case DW_TAG_base_type:
     case DW_TAG_subrange_type:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_TYPEDEF, -1,
 			   psymbol_placement::STATIC,
@@ -9019,7 +9019,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
       break;
     case DW_TAG_imported_declaration:
     case DW_TAG_namespace:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_TYPEDEF, -1,
 			   psymbol_placement::GLOBAL,
@@ -9030,7 +9030,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
          available without any name.  If so, we skip the module as it
          doesn't bring any value.  */
       if (actual_name != nullptr)
-	add_psymbol_to_list (actual_name, strlen (actual_name),
+	add_psymbol_to_list (actual_name,
 			     built_actual_name != NULL,
 			     MODULE_DOMAIN, LOC_TYPEDEF, -1,
 			     psymbol_placement::GLOBAL,
@@ -9054,7 +9054,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 
       /* NOTE: carlton/2003-10-07: See comment in new_symbol about
 	 static vs. global.  */
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 			   cu->language == language_cplus
@@ -9064,7 +9064,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 
       break;
     case DW_TAG_enumerator:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_CONST, -1,
 			   cu->language == language_cplus
@@ -9888,8 +9888,7 @@ fixup_go_packaging (struct dwarf2_cu *cu)
 
       sym = allocate_symbol (objfile);
       SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
-      SYMBOL_SET_NAMES (sym, saved_package_name,
-			strlen (saved_package_name), 0, objfile);
+      SYMBOL_SET_NAMES (sym, saved_package_name, false, objfile);
       /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
 	 e.g., "main" finds the "main" module and not C's main().  */
       SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
@@ -18533,7 +18532,7 @@ load_partial_dies (const struct die_reader_specs *reader,
 	      || pdi.tag == DW_TAG_subrange_type))
 	{
 	  if (building_psymtab && pdi.name != NULL)
-	    add_psymbol_to_list (pdi.name, strlen (pdi.name), false,
+	    add_psymbol_to_list (pdi.name, false,
 				 VAR_DOMAIN, LOC_TYPEDEF, -1,
 				 psymbol_placement::STATIC,
 				 0, cu->language, objfile);
@@ -18567,7 +18566,7 @@ load_partial_dies (const struct die_reader_specs *reader,
 	  if (pdi.name == NULL)
 	    complaint (_("malformed enumerator DIE ignored"));
 	  else if (building_psymtab)
-	    add_psymbol_to_list (pdi.name, strlen (pdi.name), false,
+	    add_psymbol_to_list (pdi.name, false,
 				 VAR_DOMAIN, LOC_CONST, -1,
 				 cu->language == language_cplus
 				 ? psymbol_placement::GLOBAL
@@ -21551,7 +21550,7 @@ new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
       /* Cache this symbol's name and the name's demangled form (if any).  */
       SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
       linkagename = dwarf2_physname (name, die, cu);
-      SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
+      SYMBOL_SET_NAMES (sym, linkagename, false, objfile);
 
       /* Fortran does not have mangling standard and the mangling does differ
 	 between gfortran, iFort etc.  */
diff --git a/gdb/elfread.c b/gdb/elfread.c
index a3d17e54a2..04b36d3dba 100644
--- a/gdb/elfread.c
+++ b/gdb/elfread.c
@@ -203,8 +203,8 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       || ms_type == mst_text_gnu_ifunc)
     address = gdbarch_addr_bits_remove (gdbarch, address);
 
-  return reader.record_full (name, name_len, copy_name, address,
-			     ms_type,
+  return reader.record_full (gdb::string_view (name, name_len), copy_name,
+			     address, ms_type,
 			     gdb_bfd_section_index (objfile->obfd,
 						    bfd_section));
 }
diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index 0956fbdb67..5921251f65 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -3048,8 +3048,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			  namestring = gdbarch_static_transform_name
 					 (gdbarch, namestring);
 
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_STATIC,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_STATIC,
 					     SECT_OFF_DATA (objfile),
 					     psymbol_placement::STATIC,
 					     sh.value,
@@ -3059,8 +3060,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			/* The addresses in these entries are reported
 			   to be wrong.  See the code that reads 'G's
 			   for symtabs.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_STATIC,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_STATIC,
 					     SECT_OFF_DATA (objfile),
 					     psymbol_placement::GLOBAL,
 					     sh.value,
@@ -3078,21 +3080,20 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    || (p == namestring + 1
 				&& namestring[0] != ' '))
 			  {
-			    add_psymbol_to_list (namestring, p - namestring, true,
-						 STRUCT_DOMAIN, LOC_TYPEDEF,
-						 -1,
-						 psymbol_placement::STATIC,
-						 0, psymtab_language, objfile);
+			    add_psymbol_to_list
+			      (gdb::string_view (namestring, p - namestring),
+			       true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+			       psymbol_placement::STATIC, 0, psymtab_language,
+			       objfile);
 			    if (p[2] == 't')
 			      {
 				/* Also a typedef with the same name.  */
-				add_psymbol_to_list (namestring,
-						     p - namestring, true,
-						     VAR_DOMAIN, LOC_TYPEDEF,
-						     -1,
-						     psymbol_placement::STATIC,
-						     0, psymtab_language,
-						     objfile);
+				add_psymbol_to_list
+				  (gdb::string_view (namestring,
+						     p - namestring),
+				   true, VAR_DOMAIN, LOC_TYPEDEF, -1,
+				   psymbol_placement::STATIC, 0,
+				   psymtab_language, objfile);
 				p += 1;
 			      }
 			  }
@@ -3101,11 +3102,12 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			if (p != namestring)	/* a name is there, not
 						   just :T...  */
 			  {
-			    add_psymbol_to_list (namestring, p - namestring,
-						 true, VAR_DOMAIN, LOC_TYPEDEF,
-						 -1,
-						 psymbol_placement::STATIC,
-						 0, psymtab_language, objfile);
+			    add_psymbol_to_list
+			      (gdb::string_view (namestring,
+						 p - namestring),
+			       true, VAR_DOMAIN, LOC_TYPEDEF, -1,
+			       psymbol_placement::STATIC, 0, psymtab_language,
+			       objfile);
 			  }
 		      check_enum:
 			/* If this is an enumerated type, we need to add
@@ -3166,9 +3168,10 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 				/* Note that the value doesn't matter for
 				   enum constants in psymtabs, just in
 				   symtabs.  */
-				add_psymbol_to_list (p, q - p, true,
-						     VAR_DOMAIN, LOC_CONST,
-						     -1,
+				add_psymbol_to_list (gdb::string_view (p,
+								       q - p),
+						     true, VAR_DOMAIN,
+						     LOC_CONST, -1,
 						     psymbol_placement::STATIC,
 						     0, psymtab_language,
 						     objfile);
@@ -3185,8 +3188,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			continue;
 		      case 'c':
 			/* Constant, e.g. from "const" in Pascal.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_CONST, -1,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_CONST, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
 			continue;
@@ -3198,8 +3202,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    function_outside_compilation_unit_complaint
 			      (copy.c_str ());
 			  }
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_BLOCK,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_BLOCK,
 					     SECT_OFF_TEXT (objfile),
 					     psymbol_placement::STATIC,
 					     sh.value,
@@ -3217,8 +3222,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    function_outside_compilation_unit_complaint
 			      (copy.c_str ());
 			  }
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_BLOCK,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_BLOCK,
 					     SECT_OFF_TEXT (objfile),
 					     psymbol_placement::GLOBAL,
 					     sh.value,
@@ -3452,13 +3458,13 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		     symbol table, and the MAIN__ symbol via the minimal
 		     symbol table.  */
 		  if (sh.st == stProc)
-		    add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		    add_psymbol_to_list (sym_name, true,
 					 VAR_DOMAIN, LOC_BLOCK,
 					 section,
 					 psymbol_placement::GLOBAL,
 					 sh.value, psymtab_language, objfile);
 		  else
-		    add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		    add_psymbol_to_list (sym_name, true,
 					 VAR_DOMAIN, LOC_BLOCK,
 					 section,
 					 psymbol_placement::STATIC,
@@ -3525,7 +3531,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		      && sh.iss != 0
 		      && sh.index != cur_sdx + 2)
 		    {
-		      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		      add_psymbol_to_list (sym_name, true,
 					   STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 					   psymbol_placement::STATIC,
 					   0, psymtab_language, objfile);
@@ -3565,7 +3571,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		  continue;
 		}
 	      /* Use this gdb symbol.  */
-	      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+	      add_psymbol_to_list (sym_name, true,
 				   VAR_DOMAIN, theclass, section,
 				   psymbol_placement::STATIC,
 				   sh.value, psymtab_language, objfile);
@@ -3644,7 +3650,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		  break;
 		}
 	      char *sym_name = debug_info->ssext + psh->iss;
-	      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+	      add_psymbol_to_list (sym_name, true,
 				   VAR_DOMAIN, theclass,
 				   section,
 				   psymbol_placement::GLOBAL,
@@ -3807,7 +3813,7 @@ handle_psymbol_enumerators (struct objfile *objfile, FDR *fh, int stype,
 
       /* Note that the value doesn't matter for enum constants
          in psymtabs, just in symtabs.  */
-      add_psymbol_to_list (name, strlen (name), true,
+      add_psymbol_to_list (name, true,
 			   VAR_DOMAIN, LOC_CONST, -1,
 			   psymbol_placement::STATIC, 0,
 			   psymtab_language, objfile);
@@ -4758,7 +4764,7 @@ new_symbol (const char *name)
 
   SYMBOL_SET_LANGUAGE (s, psymtab_language,
 		       &mdebugread_objfile->objfile_obstack);
-  SYMBOL_SET_NAMES (s, name, strlen (name), 1, mdebugread_objfile);
+  SYMBOL_SET_NAMES (s, name, true, mdebugread_objfile);
   return s;
 }
 
diff --git a/gdb/minsyms.c b/gdb/minsyms.c
index 83f5d89577..379877dc26 100644
--- a/gdb/minsyms.c
+++ b/gdb/minsyms.c
@@ -1063,7 +1063,7 @@ mst_str (minimal_symbol_type t)
 /* See minsyms.h.  */
 
 struct minimal_symbol *
-minimal_symbol_reader::record_full (const char *name, int name_len,
+minimal_symbol_reader::record_full (gdb::string_view name,
 				    bool copy_name, CORE_ADDR address,
 				    enum minimal_symbol_type ms_type,
 				    int section)
@@ -1077,24 +1077,22 @@ minimal_symbol_reader::record_full (const char *name, int name_len,
      lookup_minimal_symbol_by_pc would have no way of getting the
      right one.  */
   if (ms_type == mst_file_text && name[0] == 'g'
-      && (strcmp (name, GCC_COMPILED_FLAG_SYMBOL) == 0
-	  || strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0))
+      && (name == GCC_COMPILED_FLAG_SYMBOL
+	  || name == GCC2_COMPILED_FLAG_SYMBOL))
     return (NULL);
 
   /* It's safe to strip the leading char here once, since the name
      is also stored stripped in the minimal symbol table.  */
   if (name[0] == get_symbol_leading_char (m_objfile->obfd))
-    {
-      ++name;
-      --name_len;
-    }
+    name = name.substr (1);
 
-  if (ms_type == mst_file_text && startswith (name, "__gnu_compiled"))
+  if (ms_type == mst_file_text && startswith (name.data (), "__gnu_compiled"))
     return (NULL);
 
   if (symtab_create_debug >= 2)
-    printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %s\n",
-               mst_str (ms_type), hex_string (address), section, name);
+    printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %.*s\n",
+               mst_str (ms_type), hex_string (address), section,
+	       (int) name.size (), name.data ());
 
   if (m_msym_bunch_index == BUNCH_SIZE)
     {
@@ -1106,7 +1104,7 @@ minimal_symbol_reader::record_full (const char *name, int name_len,
   msymbol = &m_msym_bunch->contents[m_msym_bunch_index];
   symbol_set_language (msymbol, language_auto,
 		       &m_objfile->per_bfd->storage_obstack);
-  symbol_set_names (msymbol, name, name_len, copy_name, m_objfile->per_bfd);
+  symbol_set_names (msymbol, name, copy_name, m_objfile->per_bfd);
 
   SET_MSYMBOL_VALUE_ADDRESS (msymbol, address);
   MSYMBOL_SECTION (msymbol) = section;
diff --git a/gdb/minsyms.h b/gdb/minsyms.h
index ce4b83d544..f62a2b9914 100644
--- a/gdb/minsyms.h
+++ b/gdb/minsyms.h
@@ -88,7 +88,6 @@ class minimal_symbol_reader
      Arguments are:
 
      NAME - the symbol's name
-     NAME_LEN - the length of the name
      COPY_NAME - if true, the minsym code must make a copy of NAME.  If
      false, then NAME must be NUL-terminated, and must have a lifetime
      that is at least as long as OBJFILE's lifetime.
@@ -97,15 +96,14 @@ class minimal_symbol_reader
      SECTION - the symbol's section
   */
 
-  struct minimal_symbol *record_full (const char *name,
-				      int name_len,
+  struct minimal_symbol *record_full (gdb::string_view name,
 				      bool copy_name,
 				      CORE_ADDR address,
 				      enum minimal_symbol_type ms_type,
 				      int section);
 
   /* Like record_full, but:
-     - uses strlen to compute NAME_LEN,
+     - computes the length of NAME
      - passes COPY_NAME = true,
      - and passes a default SECTION, depending on the type
 
@@ -115,7 +113,7 @@ class minimal_symbol_reader
 	       enum minimal_symbol_type ms_type);
 
   /* Like record_full, but:
-     - uses strlen to compute NAME_LEN,
+     - computes the length of NAME
      - passes COPY_NAME = true.
 
      This variant does not return the new symbol.  */
@@ -124,7 +122,7 @@ class minimal_symbol_reader
 			 enum minimal_symbol_type ms_type,
 			 int section)
   {
-    record_full (name, strlen (name), true, address, ms_type, section);
+    record_full (name, true, address, ms_type, section);
   }
 
  private:
diff --git a/gdb/psympriv.h b/gdb/psympriv.h
index 3e89742d8d..9404c46837 100644
--- a/gdb/psympriv.h
+++ b/gdb/psympriv.h
@@ -22,6 +22,7 @@
 
 #include "psymtab.h"
 #include "objfiles.h"
+#include "gdbsupport/gdb_string_view.h"
 
 /* A partial_symbol records the name, domain, and address class of
    symbols whose types we have not parsed yet.  For functions, it also
@@ -304,14 +305,13 @@ enum class psymbol_placement
    LANGUAGE is the language from which the symbol originates.  This will
    influence, amongst other things, how the symbol name is demangled. */
 
-extern void add_psymbol_to_list (const char *name, int namelength,
-				 bool copy_name, domain_enum domain,
-				 enum address_class theclass,
-				 short section,
-				 psymbol_placement where,
-				 CORE_ADDR coreaddr,
-				 enum language language,
-				 struct objfile *objfile);
+extern void add_psymbol_to_list (gdb::string_view,
+				 bool, domain_enum,
+				 enum address_class,
+				 short /* section */,
+				 enum psymbol_placement,
+				 CORE_ADDR,
+				 enum language, struct objfile *);
 
 /* Initialize storage for partial symbols.  If partial symbol storage
    has already been initialized, this does nothing.  TOTAL_SYMBOLS is
diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index 31b6d59777..b30d29e6ef 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -1568,7 +1568,7 @@ psymbol_compare (const void *addr1, const void *addr2, int length)
    different domain (or address) is possible and correct.  */
 
 static struct partial_symbol *
-add_psymbol_to_bcache (const char *name, int namelength, bool copy_name,
+add_psymbol_to_bcache (gdb::string_view name, bool copy_name,
 		       domain_enum domain,
 		       enum address_class theclass,
 		       short section,
@@ -1585,7 +1585,7 @@ add_psymbol_to_bcache (const char *name, int namelength, bool copy_name,
   psymbol.aclass = theclass;
   symbol_set_language (&psymbol.ginfo, language,
 		       objfile->partial_symtabs->obstack ());
-  symbol_set_names (&psymbol.ginfo, name, namelength, copy_name,
+  symbol_set_names (&psymbol.ginfo, name, copy_name,
 		    objfile->per_bfd);
 
   /* Stash the partial symbol away in the cache.  */
@@ -1608,7 +1608,7 @@ append_psymbol_to_list (std::vector<partial_symbol *> *list,
 /* See psympriv.h.  */
 
 void
-add_psymbol_to_list (const char *name, int namelength, bool copy_name,
+add_psymbol_to_list (gdb::string_view name, bool copy_name,
 		     domain_enum domain,
 		     enum address_class theclass,
 		     short section,
@@ -1621,7 +1621,7 @@ add_psymbol_to_list (const char *name, int namelength, bool copy_name,
   int added;
 
   /* Stash the partial symbol away in the cache.  */
-  psym = add_psymbol_to_bcache (name, namelength, copy_name, domain, theclass,
+  psym = add_psymbol_to_bcache (name, copy_name, domain, theclass,
 				section, coreaddr, language, objfile, &added);
 
   /* Do not duplicate global partial symbols.  */
diff --git a/gdb/stabsread.c b/gdb/stabsread.c
index 48c88ded55..d8cb4a5264 100644
--- a/gdb/stabsread.c
+++ b/gdb/stabsread.c
@@ -751,11 +751,12 @@ define_symbol (CORE_ADDR valu, const char *string, int desc, int type,
       if (!new_name.empty ())
 	{
 	  SYMBOL_SET_NAMES (sym,
-			    new_name.c_str (), new_name.length (),
+			    new_name,
 			    1, objfile);
 	}
       else
-	SYMBOL_SET_NAMES (sym, string, p - string, 1, objfile);
+	SYMBOL_SET_NAMES (sym, gdb::string_view (string, p - string), true,
+			  objfile);
 
       if (SYMBOL_LANGUAGE (sym) == language_cplus)
 	cp_scan_for_anonymous_namespaces (get_buildsym_compunit (), sym,
diff --git a/gdb/symtab.c b/gdb/symtab.c
index 6ea9fc6971..16cb5b7c94 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -811,7 +811,7 @@ symbol_find_demangled_name (struct general_symbol_info *gsymbol,
 
 void
 symbol_set_names (struct general_symbol_info *gsymbol,
-		  const char *linkage_name, int len, bool copy_name,
+		  gdb::string_view linkage_name, bool copy_name,
 		  struct objfile_per_bfd_storage *per_bfd)
 {
   struct demangled_name_entry **slot;
@@ -824,14 +824,14 @@ symbol_set_names (struct general_symbol_info *gsymbol,
       /* In Ada, we do the symbol lookups using the mangled name, so
          we can save some space by not storing the demangled name.  */
       if (!copy_name)
-	gsymbol->name = linkage_name;
+	gsymbol->name = linkage_name.data ();
       else
 	{
 	  char *name = (char *) obstack_alloc (&per_bfd->storage_obstack,
-					       len + 1);
+					       linkage_name.length () + 1);
 
-	  memcpy (name, linkage_name, len);
-	  name[len] = '\0';
+	  memcpy (name, linkage_name.data (), linkage_name.length ());
+	  name[linkage_name.length ()] = '\0';
 	  gsymbol->name = name;
 	}
       symbol_set_demangled_name (gsymbol, NULL, &per_bfd->storage_obstack);
@@ -842,18 +842,18 @@ symbol_set_names (struct general_symbol_info *gsymbol,
   if (per_bfd->demangled_names_hash == NULL)
     create_demangled_names_hash (per_bfd);
 
-  if (linkage_name[len] != '\0')
+  if (linkage_name[linkage_name.length ()] != '\0')
     {
       char *alloc_name;
 
-      alloc_name = (char *) alloca (len + 1);
-      memcpy (alloc_name, linkage_name, len);
-      alloc_name[len] = '\0';
+      alloc_name = (char *) alloca (linkage_name.length () + 1);
+      memcpy (alloc_name, linkage_name.data (), linkage_name.length ());
+      alloc_name[linkage_name.length ()] = '\0';
 
       linkage_name_copy = alloc_name;
     }
   else
-    linkage_name_copy = linkage_name;
+    linkage_name_copy = linkage_name.data ();
 
   entry.mangled = linkage_name_copy;
   slot = ((struct demangled_name_entry **)
@@ -881,14 +881,14 @@ symbol_set_names (struct general_symbol_info *gsymbol,
 	 It turns out that it is actually important to still save such
 	 an entry in the hash table, because storing this name gives
 	 us better bcache hit rates for partial symbols.  */
-      if (!copy_name && linkage_name_copy == linkage_name)
+      if (!copy_name && linkage_name_copy == linkage_name.data ())
 	{
 	  *slot
 	    = ((struct demangled_name_entry *)
 	       obstack_alloc (&per_bfd->storage_obstack,
 			      offsetof (struct demangled_name_entry, demangled)
 			      + demangled_len + 1));
-	  (*slot)->mangled = linkage_name;
+	  (*slot)->mangled = linkage_name.data ();
 	}
       else
 	{
@@ -901,7 +901,7 @@ symbol_set_names (struct general_symbol_info *gsymbol,
 	    = ((struct demangled_name_entry *)
 	       obstack_alloc (&per_bfd->storage_obstack,
 			      offsetof (struct demangled_name_entry, demangled)
-			      + len + demangled_len + 2));
+			      + linkage_name.length () + demangled_len + 2));
 	  mangled_ptr = &((*slot)->demangled[demangled_len + 1]);
 	  strcpy (mangled_ptr, linkage_name_copy);
 	  (*slot)->mangled = mangled_ptr;
diff --git a/gdb/symtab.h b/gdb/symtab.h
index 1f0fc62a65..1546d83029 100644
--- a/gdb/symtab.h
+++ b/gdb/symtab.h
@@ -29,6 +29,7 @@
 #include "gdbsupport/enum-flags.h"
 #include "gdbsupport/function-view.h"
 #include "gdbsupport/gdb_optional.h"
+#include "gdbsupport/gdb_string_view.h"
 #include "gdbsupport/next-iterator.h"
 #include "completer.h"
 
@@ -493,11 +494,11 @@ extern void symbol_set_language (struct general_symbol_info *symbol,
 
 /* Set the linkage and natural names of a symbol, by demangling
    the linkage name.  */
-#define SYMBOL_SET_NAMES(symbol,linkage_name,len,copy_name,objfile)	\
-  symbol_set_names (&(symbol)->ginfo, linkage_name, len, copy_name, \
+#define SYMBOL_SET_NAMES(symbol,linkage_name,copy_name,objfile)	\
+  symbol_set_names (&(symbol)->ginfo, linkage_name, copy_name, \
 		    (objfile)->per_bfd)
 extern void symbol_set_names (struct general_symbol_info *symbol,
-			      const char *linkage_name, int len, bool copy_name,
+			      gdb::string_view linkage_name, bool copy_name,
 			      struct objfile_per_bfd_storage *per_bfd);
 
 /* Now come lots of name accessor macros.  Short version as to when to
diff --git a/gdb/xcoffread.c b/gdb/xcoffread.c
index 2fa2706653..52a700215d 100644
--- a/gdb/xcoffread.c
+++ b/gdb/xcoffread.c
@@ -2644,8 +2644,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		  namestring = gdbarch_static_transform_name
 				 (gdbarch, namestring);
 
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_STATIC,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_STATIC,
 				     SECT_OFF_DATA (objfile),
 				     psymbol_placement::STATIC,
 				     symbol.n_value,
@@ -2655,8 +2656,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 	      case 'G':
 		/* The addresses in these entries are reported to be
 		   wrong.  See the code that reads 'G's for symtabs.  */
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_STATIC,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_STATIC,
 				     SECT_OFF_DATA (objfile),
 				     psymbol_placement::GLOBAL,
 				     symbol.n_value,
@@ -2674,15 +2676,17 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		    || (p == namestring + 1
 			&& namestring[0] != ' '))
 		  {
-		    add_psymbol_to_list (namestring, p - namestring, true,
-					 STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+		    add_psymbol_to_list (gdb::string_view (namestring,
+							   p - namestring),
+					 true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 					 psymbol_placement::STATIC,
 					 0, psymtab_language, objfile);
 		    if (p[2] == 't')
 		      {
 			/* Also a typedef with the same name.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_TYPEDEF, -1,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
 			p += 1;
@@ -2693,8 +2697,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 	      case 't':
 		if (p != namestring)	/* a name is there, not just :T...  */
 		  {
-		    add_psymbol_to_list (namestring, p - namestring, true,
-					 VAR_DOMAIN, LOC_TYPEDEF, -1,
+		    add_psymbol_to_list (gdb::string_view (namestring,
+							   p - namestring),
+					 true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					 psymbol_placement::STATIC,
 					 0, psymtab_language, objfile);
 		  }
@@ -2755,7 +2760,7 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 			  ;
 			/* Note that the value doesn't matter for
 			   enum constants in psymtabs, just in symtabs.  */
-			add_psymbol_to_list (p, q - p, true,
+			add_psymbol_to_list (gdb::string_view (p, q - p), true,
 					     VAR_DOMAIN, LOC_CONST, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
@@ -2773,8 +2778,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 
 	      case 'c':
 		/* Constant, e.g. from "const" in Pascal.  */
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_CONST, -1,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_CONST, -1,
 				     psymbol_placement::STATIC,
 				     0, psymtab_language, objfile);
 		continue;
@@ -2790,8 +2796,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		    function_outside_compilation_unit_complaint (name);
 		    xfree (name);
 		  }
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_BLOCK,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_BLOCK,
 				     SECT_OFF_TEXT (objfile),
 				     psymbol_placement::STATIC,
 				     symbol.n_value,
@@ -2820,8 +2827,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		if (startswith (namestring, "@FIX"))
 		  continue;
 
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_BLOCK,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_BLOCK,
 				     SECT_OFF_TEXT (objfile),
 				     psymbol_placement::GLOBAL,
 				     symbol.n_value,
-- 
2.23.0.444.g18eeb5a265-goog

Re: [PATCH v4] Change some arguments to gdb::string_view instead of name+len

[Tom Tromey]

>>>>> "Christian" == Christian Biesinger via gdb-patches <gdb-patches@sourceware.org> writes:

Christian> [This version also replaces an instance of strcmp with string_view's
Christian> operator==, so that the length is correctly respected]

Thanks.

Unfortunately I found / remembered another weirdness.

Christian> -  if (linkage_name[len] != '\0')
Christian> +  if (linkage_name[linkage_name.length ()] != '\0')

This code let the caller pass in a possibly-unterminated string, and
then made a local copy with the terminating \0 in that case.

However, this was always a bad idea, and now is probably a libstdc++
debug-mode assertion failure (<- just guessing but if it isn't, it
should be!).

Tom

Re: [PATCH v4] Change some arguments to gdb::string_view instead of name+len

[Christian Biesinger via gdb-patches]

On Tue, Oct 1, 2019 at 12:18 PM Tom Tromey <tom@tromey.com> wrote:
>
> >>>>> "Christian" == Christian Biesinger via gdb-patches <gdb-patches@sourceware.org> writes:
>
> Christian> [This version also replaces an instance of strcmp with string_view's
> Christian> operator==, so that the length is correctly respected]
>
> Thanks.
>
> Unfortunately I found / remembered another weirdness.
>
> Christian> -  if (linkage_name[len] != '\0')
> Christian> +  if (linkage_name[linkage_name.length ()] != '\0')
>
> This code let the caller pass in a possibly-unterminated string, and
> then made a local copy with the terminating \0 in that case.
>
> However, this was always a bad idea, and now is probably a libstdc++
> debug-mode assertion failure (<- just guessing but if it isn't, it
> should be!).

Well, gdb::string_view (and libstdc++ in g++ 8 and 10) does have this:
      constexpr const _CharT&
      operator[](size_type __pos) const
      {
// TODO: Assert to restore in a way compatible with the constexpr.
// __glibcxx_assert(__pos < this->_M_len);

So I'm going to change it to .data()[]. Sending a new patch in a second.

Christian

[PATCH] Change some arguments to gdb::string_view instead of name+len

[Christian Biesinger via gdb-patches]

Just some code cleanup. This change has a few benefits:
- Shorter argument list in the functions
- If the caller needs to calculate the string, they no longer
  need to explicitly call strlen
- It is easy to pass std::string to this (done in one place
  currently)

This also updates a couple of places that were passing 0/1 to
a bool parameter.

gdb/ChangeLog:

2019-09-29  Christian Biesinger  <cbiesinger@google.com>

	* coffread.c (record_minimal_symbol): Update.
	(process_coff_symbol): Update.
	* dbxread.c (read_dbx_symtab): Update.
	* dwarf2read.c (add_partial_symbol): Update.
	(fixup_go_packaging): Update.
	(load_partial_dies): Update.
	(new_symbol): Update.
	* elfread.c (record_minimal_symbol): Update.
	* mdebugread.c (parse_partial_symbols): Update.
	(handle_psymbol_enumerators): Update.
	(new_symbol): Update.
	* minsyms.c (minimal_symbol_reader::record_full): Change signature
	to use gdb::string_view instead of name+len.
	* minsyms.h (class minimal_symbol_reader) <record_full>: Likewise.
	* psympriv.h (add_psymbol_to_list): Likewise.
	* psymtab.c (add_psymbol_to_bcache): Likewise.
	(add_psymbol_to_list): Likewise.
	* stabsread.c (define_symbol): Update.
	* symtab.c (symbol_set_names): Change signature to use gdb::string_view.
	* symtab.h (SYMBOL_SET_NAMES): Likewise.
	(symbol_set_names): Likewise.
	* xcoffread.c (scan_xcoff_symtab): Update.
---
 gdb/coffread.c   |  5 ++-
 gdb/dbxread.c    | 24 +++++++--------
 gdb/dwarf2read.c | 29 +++++++++---------
 gdb/elfread.c    |  4 +--
 gdb/mdebugread.c | 80 ++++++++++++++++++++++++++----------------------
 gdb/minsyms.c    | 20 ++++++------
 gdb/minsyms.h    | 10 +++---
 gdb/psympriv.h   | 16 +++++-----
 gdb/psymtab.c    |  8 ++---
 gdb/stabsread.c  |  5 +--
 gdb/symtab.c     | 26 ++++++++--------
 gdb/symtab.h     |  7 +++--
 gdb/xcoffread.c  | 42 +++++++++++++++----------
 13 files changed, 143 insertions(+), 133 deletions(-)

diff --git a/gdb/coffread.c b/gdb/coffread.c
index c44b69069e..52b9c57b9c 100644
--- a/gdb/coffread.c
+++ b/gdb/coffread.c
@@ -462,8 +462,7 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       return NULL;
     }
 
-  return reader.record_full (cs->c_name, strlen (cs->c_name), true, address,
-			     type, section);
+  return reader.record_full (cs->c_name, true, address, type, section);
 }
 \f
 /* coff_symfile_init ()
@@ -1569,7 +1568,7 @@ process_coff_symbol (struct coff_symbol *cs,
   name = EXTERNAL_NAME (name, objfile->obfd);
   SYMBOL_SET_LANGUAGE (sym, get_current_subfile ()->language,
 		       &objfile->objfile_obstack);
-  SYMBOL_SET_NAMES (sym, name, strlen (name), 1, objfile);
+  SYMBOL_SET_NAMES (sym, name, true, objfile);
 
   /* default assumptions */
   SYMBOL_VALUE (sym) = cs->c_value;
diff --git a/gdb/dbxread.c b/gdb/dbxread.c
index 564c5d3a41..16727ef108 100644
--- a/gdb/dbxread.c
+++ b/gdb/dbxread.c
@@ -1464,7 +1464,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	      if (gdbarch_static_transform_name_p (gdbarch))
 		gdbarch_static_transform_name (gdbarch, namestring);
 
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_STATIC,
 				   data_sect_index,
 				   psymbol_placement::STATIC,
@@ -1474,7 +1474,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	    case 'G':
 	      /* The addresses in these entries are reported to be
 		 wrong.  See the code that reads 'G's for symtabs.  */
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_STATIC,
 				   data_sect_index,
 				   psymbol_placement::GLOBAL,
@@ -1492,15 +1492,15 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  || (p == namestring + 1
 		      && namestring[0] != ' '))
 		{
-		  add_psymbol_to_list (sym_name, sym_len, true,
-				       STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+		  add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+				       true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 				       psymbol_placement::STATIC,
 				       0, psymtab_language, objfile);
 		  if (p[2] == 't')
 		    {
 		      /* Also a typedef with the same name.  */
-		      add_psymbol_to_list (sym_name, sym_len, true,
-					   VAR_DOMAIN, LOC_TYPEDEF, -1,
+		      add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+					   true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					   psymbol_placement::STATIC,
 					   0, psymtab_language, objfile);
 		      p += 1;
@@ -1511,8 +1511,8 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	    case 't':
 	      if (p != namestring)	/* a name is there, not just :T...  */
 		{
-		  add_psymbol_to_list (sym_name, sym_len, true,
-				       VAR_DOMAIN, LOC_TYPEDEF, -1,
+		  add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+				       true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 				       psymbol_placement::STATIC,
 				       0, psymtab_language, objfile);
 		}
@@ -1572,7 +1572,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 			;
 		      /* Note that the value doesn't matter for
 			 enum constants in psymtabs, just in symtabs.  */
-		      add_psymbol_to_list (p, q - p, true,
+		      add_psymbol_to_list (gdb::string_view (p, q - p), true,
 					   VAR_DOMAIN, LOC_CONST, -1,
 					   psymbol_placement::STATIC, 0,
 					   psymtab_language, objfile);
@@ -1590,7 +1590,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 
 	    case 'c':
 	      /* Constant, e.g. from "const" in Pascal.  */
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_CONST, -1,
 				   psymbol_placement::STATIC, 0,
 				   psymtab_language, objfile);
@@ -1645,7 +1645,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  pst->set_text_low (nlist.n_value);
 		  textlow_not_set = 0;
 		}
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_BLOCK,
 				   SECT_OFF_TEXT (objfile),
 				   psymbol_placement::STATIC,
@@ -1704,7 +1704,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  pst->set_text_low (nlist.n_value);
 		  textlow_not_set = 0;
 		}
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_BLOCK,
 				   SECT_OFF_TEXT (objfile),
 				   psymbol_placement::GLOBAL,
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 1052501c35..ff0fc7a06a 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -8922,7 +8922,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
              of the global scope.  But in Ada, we want to be able to access
              nested procedures globally.  So all Ada subprograms are stored
              in the global scope.  */
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_BLOCK,
 			       SECT_OFF_TEXT (objfile),
@@ -8932,7 +8932,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	}
       else
 	{
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_BLOCK,
 			       SECT_OFF_TEXT (objfile),
@@ -8944,7 +8944,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	set_objfile_main_name (objfile, actual_name, cu->language);
       break;
     case DW_TAG_constant:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
 			   -1, (pdi->is_external
 				? psymbol_placement::GLOBAL
@@ -8980,7 +8980,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	     table building.  */
 
 	  if (pdi->d.locdesc || pdi->has_type)
-	    add_psymbol_to_list (actual_name, strlen (actual_name),
+	    add_psymbol_to_list (actual_name,
 				 built_actual_name != NULL,
 				 VAR_DOMAIN, LOC_STATIC,
 				 SECT_OFF_TEXT (objfile),
@@ -8999,7 +8999,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	      return;
 	    }
 
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_STATIC,
 			       SECT_OFF_TEXT (objfile),
@@ -9011,7 +9011,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
     case DW_TAG_typedef:
     case DW_TAG_base_type:
     case DW_TAG_subrange_type:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_TYPEDEF, -1,
 			   psymbol_placement::STATIC,
@@ -9019,7 +9019,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
       break;
     case DW_TAG_imported_declaration:
     case DW_TAG_namespace:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_TYPEDEF, -1,
 			   psymbol_placement::GLOBAL,
@@ -9030,7 +9030,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
          available without any name.  If so, we skip the module as it
          doesn't bring any value.  */
       if (actual_name != nullptr)
-	add_psymbol_to_list (actual_name, strlen (actual_name),
+	add_psymbol_to_list (actual_name,
 			     built_actual_name != NULL,
 			     MODULE_DOMAIN, LOC_TYPEDEF, -1,
 			     psymbol_placement::GLOBAL,
@@ -9054,7 +9054,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 
       /* NOTE: carlton/2003-10-07: See comment in new_symbol about
 	 static vs. global.  */
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 			   cu->language == language_cplus
@@ -9064,7 +9064,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 
       break;
     case DW_TAG_enumerator:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_CONST, -1,
 			   cu->language == language_cplus
@@ -9888,8 +9888,7 @@ fixup_go_packaging (struct dwarf2_cu *cu)
 
       sym = allocate_symbol (objfile);
       SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
-      SYMBOL_SET_NAMES (sym, saved_package_name,
-			strlen (saved_package_name), 0, objfile);
+      SYMBOL_SET_NAMES (sym, saved_package_name, false, objfile);
       /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
 	 e.g., "main" finds the "main" module and not C's main().  */
       SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
@@ -18533,7 +18532,7 @@ load_partial_dies (const struct die_reader_specs *reader,
 	      || pdi.tag == DW_TAG_subrange_type))
 	{
 	  if (building_psymtab && pdi.name != NULL)
-	    add_psymbol_to_list (pdi.name, strlen (pdi.name), false,
+	    add_psymbol_to_list (pdi.name, false,
 				 VAR_DOMAIN, LOC_TYPEDEF, -1,
 				 psymbol_placement::STATIC,
 				 0, cu->language, objfile);
@@ -18567,7 +18566,7 @@ load_partial_dies (const struct die_reader_specs *reader,
 	  if (pdi.name == NULL)
 	    complaint (_("malformed enumerator DIE ignored"));
 	  else if (building_psymtab)
-	    add_psymbol_to_list (pdi.name, strlen (pdi.name), false,
+	    add_psymbol_to_list (pdi.name, false,
 				 VAR_DOMAIN, LOC_CONST, -1,
 				 cu->language == language_cplus
 				 ? psymbol_placement::GLOBAL
@@ -21551,7 +21550,7 @@ new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
       /* Cache this symbol's name and the name's demangled form (if any).  */
       SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
       linkagename = dwarf2_physname (name, die, cu);
-      SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
+      SYMBOL_SET_NAMES (sym, linkagename, false, objfile);
 
       /* Fortran does not have mangling standard and the mangling does differ
 	 between gfortran, iFort etc.  */
diff --git a/gdb/elfread.c b/gdb/elfread.c
index a3d17e54a2..04b36d3dba 100644
--- a/gdb/elfread.c
+++ b/gdb/elfread.c
@@ -203,8 +203,8 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       || ms_type == mst_text_gnu_ifunc)
     address = gdbarch_addr_bits_remove (gdbarch, address);
 
-  return reader.record_full (name, name_len, copy_name, address,
-			     ms_type,
+  return reader.record_full (gdb::string_view (name, name_len), copy_name,
+			     address, ms_type,
 			     gdb_bfd_section_index (objfile->obfd,
 						    bfd_section));
 }
diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index 0956fbdb67..5921251f65 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -3048,8 +3048,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			  namestring = gdbarch_static_transform_name
 					 (gdbarch, namestring);
 
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_STATIC,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_STATIC,
 					     SECT_OFF_DATA (objfile),
 					     psymbol_placement::STATIC,
 					     sh.value,
@@ -3059,8 +3060,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			/* The addresses in these entries are reported
 			   to be wrong.  See the code that reads 'G's
 			   for symtabs.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_STATIC,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_STATIC,
 					     SECT_OFF_DATA (objfile),
 					     psymbol_placement::GLOBAL,
 					     sh.value,
@@ -3078,21 +3080,20 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    || (p == namestring + 1
 				&& namestring[0] != ' '))
 			  {
-			    add_psymbol_to_list (namestring, p - namestring, true,
-						 STRUCT_DOMAIN, LOC_TYPEDEF,
-						 -1,
-						 psymbol_placement::STATIC,
-						 0, psymtab_language, objfile);
+			    add_psymbol_to_list
+			      (gdb::string_view (namestring, p - namestring),
+			       true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+			       psymbol_placement::STATIC, 0, psymtab_language,
+			       objfile);
 			    if (p[2] == 't')
 			      {
 				/* Also a typedef with the same name.  */
-				add_psymbol_to_list (namestring,
-						     p - namestring, true,
-						     VAR_DOMAIN, LOC_TYPEDEF,
-						     -1,
-						     psymbol_placement::STATIC,
-						     0, psymtab_language,
-						     objfile);
+				add_psymbol_to_list
+				  (gdb::string_view (namestring,
+						     p - namestring),
+				   true, VAR_DOMAIN, LOC_TYPEDEF, -1,
+				   psymbol_placement::STATIC, 0,
+				   psymtab_language, objfile);
 				p += 1;
 			      }
 			  }
@@ -3101,11 +3102,12 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			if (p != namestring)	/* a name is there, not
 						   just :T...  */
 			  {
-			    add_psymbol_to_list (namestring, p - namestring,
-						 true, VAR_DOMAIN, LOC_TYPEDEF,
-						 -1,
-						 psymbol_placement::STATIC,
-						 0, psymtab_language, objfile);
+			    add_psymbol_to_list
+			      (gdb::string_view (namestring,
+						 p - namestring),
+			       true, VAR_DOMAIN, LOC_TYPEDEF, -1,
+			       psymbol_placement::STATIC, 0, psymtab_language,
+			       objfile);
 			  }
 		      check_enum:
 			/* If this is an enumerated type, we need to add
@@ -3166,9 +3168,10 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 				/* Note that the value doesn't matter for
 				   enum constants in psymtabs, just in
 				   symtabs.  */
-				add_psymbol_to_list (p, q - p, true,
-						     VAR_DOMAIN, LOC_CONST,
-						     -1,
+				add_psymbol_to_list (gdb::string_view (p,
+								       q - p),
+						     true, VAR_DOMAIN,
+						     LOC_CONST, -1,
 						     psymbol_placement::STATIC,
 						     0, psymtab_language,
 						     objfile);
@@ -3185,8 +3188,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			continue;
 		      case 'c':
 			/* Constant, e.g. from "const" in Pascal.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_CONST, -1,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_CONST, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
 			continue;
@@ -3198,8 +3202,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    function_outside_compilation_unit_complaint
 			      (copy.c_str ());
 			  }
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_BLOCK,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_BLOCK,
 					     SECT_OFF_TEXT (objfile),
 					     psymbol_placement::STATIC,
 					     sh.value,
@@ -3217,8 +3222,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    function_outside_compilation_unit_complaint
 			      (copy.c_str ());
 			  }
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_BLOCK,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_BLOCK,
 					     SECT_OFF_TEXT (objfile),
 					     psymbol_placement::GLOBAL,
 					     sh.value,
@@ -3452,13 +3458,13 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		     symbol table, and the MAIN__ symbol via the minimal
 		     symbol table.  */
 		  if (sh.st == stProc)
-		    add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		    add_psymbol_to_list (sym_name, true,
 					 VAR_DOMAIN, LOC_BLOCK,
 					 section,
 					 psymbol_placement::GLOBAL,
 					 sh.value, psymtab_language, objfile);
 		  else
-		    add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		    add_psymbol_to_list (sym_name, true,
 					 VAR_DOMAIN, LOC_BLOCK,
 					 section,
 					 psymbol_placement::STATIC,
@@ -3525,7 +3531,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		      && sh.iss != 0
 		      && sh.index != cur_sdx + 2)
 		    {
-		      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		      add_psymbol_to_list (sym_name, true,
 					   STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 					   psymbol_placement::STATIC,
 					   0, psymtab_language, objfile);
@@ -3565,7 +3571,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		  continue;
 		}
 	      /* Use this gdb symbol.  */
-	      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+	      add_psymbol_to_list (sym_name, true,
 				   VAR_DOMAIN, theclass, section,
 				   psymbol_placement::STATIC,
 				   sh.value, psymtab_language, objfile);
@@ -3644,7 +3650,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		  break;
 		}
 	      char *sym_name = debug_info->ssext + psh->iss;
-	      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+	      add_psymbol_to_list (sym_name, true,
 				   VAR_DOMAIN, theclass,
 				   section,
 				   psymbol_placement::GLOBAL,
@@ -3807,7 +3813,7 @@ handle_psymbol_enumerators (struct objfile *objfile, FDR *fh, int stype,
 
       /* Note that the value doesn't matter for enum constants
          in psymtabs, just in symtabs.  */
-      add_psymbol_to_list (name, strlen (name), true,
+      add_psymbol_to_list (name, true,
 			   VAR_DOMAIN, LOC_CONST, -1,
 			   psymbol_placement::STATIC, 0,
 			   psymtab_language, objfile);
@@ -4758,7 +4764,7 @@ new_symbol (const char *name)
 
   SYMBOL_SET_LANGUAGE (s, psymtab_language,
 		       &mdebugread_objfile->objfile_obstack);
-  SYMBOL_SET_NAMES (s, name, strlen (name), 1, mdebugread_objfile);
+  SYMBOL_SET_NAMES (s, name, true, mdebugread_objfile);
   return s;
 }
 
diff --git a/gdb/minsyms.c b/gdb/minsyms.c
index 83f5d89577..379877dc26 100644
--- a/gdb/minsyms.c
+++ b/gdb/minsyms.c
@@ -1063,7 +1063,7 @@ mst_str (minimal_symbol_type t)
 /* See minsyms.h.  */
 
 struct minimal_symbol *
-minimal_symbol_reader::record_full (const char *name, int name_len,
+minimal_symbol_reader::record_full (gdb::string_view name,
 				    bool copy_name, CORE_ADDR address,
 				    enum minimal_symbol_type ms_type,
 				    int section)
@@ -1077,24 +1077,22 @@ minimal_symbol_reader::record_full (const char *name, int name_len,
      lookup_minimal_symbol_by_pc would have no way of getting the
      right one.  */
   if (ms_type == mst_file_text && name[0] == 'g'
-      && (strcmp (name, GCC_COMPILED_FLAG_SYMBOL) == 0
-	  || strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0))
+      && (name == GCC_COMPILED_FLAG_SYMBOL
+	  || name == GCC2_COMPILED_FLAG_SYMBOL))
     return (NULL);
 
   /* It's safe to strip the leading char here once, since the name
      is also stored stripped in the minimal symbol table.  */
   if (name[0] == get_symbol_leading_char (m_objfile->obfd))
-    {
-      ++name;
-      --name_len;
-    }
+    name = name.substr (1);
 
-  if (ms_type == mst_file_text && startswith (name, "__gnu_compiled"))
+  if (ms_type == mst_file_text && startswith (name.data (), "__gnu_compiled"))
     return (NULL);
 
   if (symtab_create_debug >= 2)
-    printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %s\n",
-               mst_str (ms_type), hex_string (address), section, name);
+    printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %.*s\n",
+               mst_str (ms_type), hex_string (address), section,
+	       (int) name.size (), name.data ());
 
   if (m_msym_bunch_index == BUNCH_SIZE)
     {
@@ -1106,7 +1104,7 @@ minimal_symbol_reader::record_full (const char *name, int name_len,
   msymbol = &m_msym_bunch->contents[m_msym_bunch_index];
   symbol_set_language (msymbol, language_auto,
 		       &m_objfile->per_bfd->storage_obstack);
-  symbol_set_names (msymbol, name, name_len, copy_name, m_objfile->per_bfd);
+  symbol_set_names (msymbol, name, copy_name, m_objfile->per_bfd);
 
   SET_MSYMBOL_VALUE_ADDRESS (msymbol, address);
   MSYMBOL_SECTION (msymbol) = section;
diff --git a/gdb/minsyms.h b/gdb/minsyms.h
index ce4b83d544..f62a2b9914 100644
--- a/gdb/minsyms.h
+++ b/gdb/minsyms.h
@@ -88,7 +88,6 @@ class minimal_symbol_reader
      Arguments are:
 
      NAME - the symbol's name
-     NAME_LEN - the length of the name
      COPY_NAME - if true, the minsym code must make a copy of NAME.  If
      false, then NAME must be NUL-terminated, and must have a lifetime
      that is at least as long as OBJFILE's lifetime.
@@ -97,15 +96,14 @@ class minimal_symbol_reader
      SECTION - the symbol's section
   */
 
-  struct minimal_symbol *record_full (const char *name,
-				      int name_len,
+  struct minimal_symbol *record_full (gdb::string_view name,
 				      bool copy_name,
 				      CORE_ADDR address,
 				      enum minimal_symbol_type ms_type,
 				      int section);
 
   /* Like record_full, but:
-     - uses strlen to compute NAME_LEN,
+     - computes the length of NAME
      - passes COPY_NAME = true,
      - and passes a default SECTION, depending on the type
 
@@ -115,7 +113,7 @@ class minimal_symbol_reader
 	       enum minimal_symbol_type ms_type);
 
   /* Like record_full, but:
-     - uses strlen to compute NAME_LEN,
+     - computes the length of NAME
      - passes COPY_NAME = true.
 
      This variant does not return the new symbol.  */
@@ -124,7 +122,7 @@ class minimal_symbol_reader
 			 enum minimal_symbol_type ms_type,
 			 int section)
   {
-    record_full (name, strlen (name), true, address, ms_type, section);
+    record_full (name, true, address, ms_type, section);
   }
 
  private:
diff --git a/gdb/psympriv.h b/gdb/psympriv.h
index 3e89742d8d..9404c46837 100644
--- a/gdb/psympriv.h
+++ b/gdb/psympriv.h
@@ -22,6 +22,7 @@
 
 #include "psymtab.h"
 #include "objfiles.h"
+#include "gdbsupport/gdb_string_view.h"
 
 /* A partial_symbol records the name, domain, and address class of
    symbols whose types we have not parsed yet.  For functions, it also
@@ -304,14 +305,13 @@ enum class psymbol_placement
    LANGUAGE is the language from which the symbol originates.  This will
    influence, amongst other things, how the symbol name is demangled. */
 
-extern void add_psymbol_to_list (const char *name, int namelength,
-				 bool copy_name, domain_enum domain,
-				 enum address_class theclass,
-				 short section,
-				 psymbol_placement where,
-				 CORE_ADDR coreaddr,
-				 enum language language,
-				 struct objfile *objfile);
+extern void add_psymbol_to_list (gdb::string_view,
+				 bool, domain_enum,
+				 enum address_class,
+				 short /* section */,
+				 enum psymbol_placement,
+				 CORE_ADDR,
+				 enum language, struct objfile *);
 
 /* Initialize storage for partial symbols.  If partial symbol storage
    has already been initialized, this does nothing.  TOTAL_SYMBOLS is
diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index 31b6d59777..b30d29e6ef 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -1568,7 +1568,7 @@ psymbol_compare (const void *addr1, const void *addr2, int length)
    different domain (or address) is possible and correct.  */
 
 static struct partial_symbol *
-add_psymbol_to_bcache (const char *name, int namelength, bool copy_name,
+add_psymbol_to_bcache (gdb::string_view name, bool copy_name,
 		       domain_enum domain,
 		       enum address_class theclass,
 		       short section,
@@ -1585,7 +1585,7 @@ add_psymbol_to_bcache (const char *name, int namelength, bool copy_name,
   psymbol.aclass = theclass;
   symbol_set_language (&psymbol.ginfo, language,
 		       objfile->partial_symtabs->obstack ());
-  symbol_set_names (&psymbol.ginfo, name, namelength, copy_name,
+  symbol_set_names (&psymbol.ginfo, name, copy_name,
 		    objfile->per_bfd);
 
   /* Stash the partial symbol away in the cache.  */
@@ -1608,7 +1608,7 @@ append_psymbol_to_list (std::vector<partial_symbol *> *list,
 /* See psympriv.h.  */
 
 void
-add_psymbol_to_list (const char *name, int namelength, bool copy_name,
+add_psymbol_to_list (gdb::string_view name, bool copy_name,
 		     domain_enum domain,
 		     enum address_class theclass,
 		     short section,
@@ -1621,7 +1621,7 @@ add_psymbol_to_list (const char *name, int namelength, bool copy_name,
   int added;
 
   /* Stash the partial symbol away in the cache.  */
-  psym = add_psymbol_to_bcache (name, namelength, copy_name, domain, theclass,
+  psym = add_psymbol_to_bcache (name, copy_name, domain, theclass,
 				section, coreaddr, language, objfile, &added);
 
   /* Do not duplicate global partial symbols.  */
diff --git a/gdb/stabsread.c b/gdb/stabsread.c
index 48c88ded55..d8cb4a5264 100644
--- a/gdb/stabsread.c
+++ b/gdb/stabsread.c
@@ -751,11 +751,12 @@ define_symbol (CORE_ADDR valu, const char *string, int desc, int type,
       if (!new_name.empty ())
 	{
 	  SYMBOL_SET_NAMES (sym,
-			    new_name.c_str (), new_name.length (),
+			    new_name,
 			    1, objfile);
 	}
       else
-	SYMBOL_SET_NAMES (sym, string, p - string, 1, objfile);
+	SYMBOL_SET_NAMES (sym, gdb::string_view (string, p - string), true,
+			  objfile);
 
       if (SYMBOL_LANGUAGE (sym) == language_cplus)
 	cp_scan_for_anonymous_namespaces (get_buildsym_compunit (), sym,
diff --git a/gdb/symtab.c b/gdb/symtab.c
index 6ea9fc6971..16cb5b7c94 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -811,7 +811,7 @@ symbol_find_demangled_name (struct general_symbol_info *gsymbol,
 
 void
 symbol_set_names (struct general_symbol_info *gsymbol,
-		  const char *linkage_name, int len, bool copy_name,
+		  gdb::string_view linkage_name, bool copy_name,
 		  struct objfile_per_bfd_storage *per_bfd)
 {
   struct demangled_name_entry **slot;
@@ -824,14 +824,14 @@ symbol_set_names (struct general_symbol_info *gsymbol,
       /* In Ada, we do the symbol lookups using the mangled name, so
          we can save some space by not storing the demangled name.  */
       if (!copy_name)
-	gsymbol->name = linkage_name;
+	gsymbol->name = linkage_name.data ();
       else
 	{
 	  char *name = (char *) obstack_alloc (&per_bfd->storage_obstack,
-					       len + 1);
+					       linkage_name.length () + 1);
 
-	  memcpy (name, linkage_name, len);
-	  name[len] = '\0';
+	  memcpy (name, linkage_name.data (), linkage_name.length ());
+	  name[linkage_name.length ()] = '\0';
 	  gsymbol->name = name;
 	}
       symbol_set_demangled_name (gsymbol, NULL, &per_bfd->storage_obstack);
@@ -842,18 +842,18 @@ symbol_set_names (struct general_symbol_info *gsymbol,
   if (per_bfd->demangled_names_hash == NULL)
     create_demangled_names_hash (per_bfd);
 
-  if (linkage_name[len] != '\0')
+  if (linkage_name[linkage_name.length ()] != '\0')
     {
       char *alloc_name;
 
-      alloc_name = (char *) alloca (len + 1);
-      memcpy (alloc_name, linkage_name, len);
-      alloc_name[len] = '\0';
+      alloc_name = (char *) alloca (linkage_name.length () + 1);
+      memcpy (alloc_name, linkage_name.data (), linkage_name.length ());
+      alloc_name[linkage_name.length ()] = '\0';
 
       linkage_name_copy = alloc_name;
     }
   else
-    linkage_name_copy = linkage_name;
+    linkage_name_copy = linkage_name.data ();
 
   entry.mangled = linkage_name_copy;
   slot = ((struct demangled_name_entry **)
@@ -881,14 +881,14 @@ symbol_set_names (struct general_symbol_info *gsymbol,
 	 It turns out that it is actually important to still save such
 	 an entry in the hash table, because storing this name gives
 	 us better bcache hit rates for partial symbols.  */
-      if (!copy_name && linkage_name_copy == linkage_name)
+      if (!copy_name && linkage_name_copy == linkage_name.data ())
 	{
 	  *slot
 	    = ((struct demangled_name_entry *)
 	       obstack_alloc (&per_bfd->storage_obstack,
 			      offsetof (struct demangled_name_entry, demangled)
 			      + demangled_len + 1));
-	  (*slot)->mangled = linkage_name;
+	  (*slot)->mangled = linkage_name.data ();
 	}
       else
 	{
@@ -901,7 +901,7 @@ symbol_set_names (struct general_symbol_info *gsymbol,
 	    = ((struct demangled_name_entry *)
 	       obstack_alloc (&per_bfd->storage_obstack,
 			      offsetof (struct demangled_name_entry, demangled)
-			      + len + demangled_len + 2));
+			      + linkage_name.length () + demangled_len + 2));
 	  mangled_ptr = &((*slot)->demangled[demangled_len + 1]);
 	  strcpy (mangled_ptr, linkage_name_copy);
 	  (*slot)->mangled = mangled_ptr;
diff --git a/gdb/symtab.h b/gdb/symtab.h
index 1f0fc62a65..1546d83029 100644
--- a/gdb/symtab.h
+++ b/gdb/symtab.h
@@ -29,6 +29,7 @@
 #include "gdbsupport/enum-flags.h"
 #include "gdbsupport/function-view.h"
 #include "gdbsupport/gdb_optional.h"
+#include "gdbsupport/gdb_string_view.h"
 #include "gdbsupport/next-iterator.h"
 #include "completer.h"
 
@@ -493,11 +494,11 @@ extern void symbol_set_language (struct general_symbol_info *symbol,
 
 /* Set the linkage and natural names of a symbol, by demangling
    the linkage name.  */
-#define SYMBOL_SET_NAMES(symbol,linkage_name,len,copy_name,objfile)	\
-  symbol_set_names (&(symbol)->ginfo, linkage_name, len, copy_name, \
+#define SYMBOL_SET_NAMES(symbol,linkage_name,copy_name,objfile)	\
+  symbol_set_names (&(symbol)->ginfo, linkage_name, copy_name, \
 		    (objfile)->per_bfd)
 extern void symbol_set_names (struct general_symbol_info *symbol,
-			      const char *linkage_name, int len, bool copy_name,
+			      gdb::string_view linkage_name, bool copy_name,
 			      struct objfile_per_bfd_storage *per_bfd);
 
 /* Now come lots of name accessor macros.  Short version as to when to
diff --git a/gdb/xcoffread.c b/gdb/xcoffread.c
index 2fa2706653..52a700215d 100644
--- a/gdb/xcoffread.c
+++ b/gdb/xcoffread.c
@@ -2644,8 +2644,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		  namestring = gdbarch_static_transform_name
 				 (gdbarch, namestring);
 
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_STATIC,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_STATIC,
 				     SECT_OFF_DATA (objfile),
 				     psymbol_placement::STATIC,
 				     symbol.n_value,
@@ -2655,8 +2656,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 	      case 'G':
 		/* The addresses in these entries are reported to be
 		   wrong.  See the code that reads 'G's for symtabs.  */
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_STATIC,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_STATIC,
 				     SECT_OFF_DATA (objfile),
 				     psymbol_placement::GLOBAL,
 				     symbol.n_value,
@@ -2674,15 +2676,17 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		    || (p == namestring + 1
 			&& namestring[0] != ' '))
 		  {
-		    add_psymbol_to_list (namestring, p - namestring, true,
-					 STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+		    add_psymbol_to_list (gdb::string_view (namestring,
+							   p - namestring),
+					 true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 					 psymbol_placement::STATIC,
 					 0, psymtab_language, objfile);
 		    if (p[2] == 't')
 		      {
 			/* Also a typedef with the same name.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_TYPEDEF, -1,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
 			p += 1;
@@ -2693,8 +2697,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 	      case 't':
 		if (p != namestring)	/* a name is there, not just :T...  */
 		  {
-		    add_psymbol_to_list (namestring, p - namestring, true,
-					 VAR_DOMAIN, LOC_TYPEDEF, -1,
+		    add_psymbol_to_list (gdb::string_view (namestring,
+							   p - namestring),
+					 true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					 psymbol_placement::STATIC,
 					 0, psymtab_language, objfile);
 		  }
@@ -2755,7 +2760,7 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 			  ;
 			/* Note that the value doesn't matter for
 			   enum constants in psymtabs, just in symtabs.  */
-			add_psymbol_to_list (p, q - p, true,
+			add_psymbol_to_list (gdb::string_view (p, q - p), true,
 					     VAR_DOMAIN, LOC_CONST, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
@@ -2773,8 +2778,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 
 	      case 'c':
 		/* Constant, e.g. from "const" in Pascal.  */
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_CONST, -1,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_CONST, -1,
 				     psymbol_placement::STATIC,
 				     0, psymtab_language, objfile);
 		continue;
@@ -2790,8 +2796,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		    function_outside_compilation_unit_complaint (name);
 		    xfree (name);
 		  }
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_BLOCK,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_BLOCK,
 				     SECT_OFF_TEXT (objfile),
 				     psymbol_placement::STATIC,
 				     symbol.n_value,
@@ -2820,8 +2827,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		if (startswith (namestring, "@FIX"))
 		  continue;
 
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_BLOCK,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_BLOCK,
 				     SECT_OFF_TEXT (objfile),
 				     psymbol_placement::GLOBAL,
 				     symbol.n_value,
-- 
2.23.0.444.g18eeb5a265-goog

[PATCH] Change some arguments to gdb::string_view instead of name+len

[Christian Biesinger via gdb-patches]

[Let me try this again, this time after I commit the changes. Fixes tromey's
comment about accessing [length] on a string view]

Just some code cleanup. This change has a few benefits:
- Shorter argument list in the functions
- If the caller needs to calculate the string, they no longer
  need to explicitly call strlen
- It is easy to pass std::string to this (done in one place
  currently)

This also updates a couple of places that were passing 0/1 to
a bool parameter.

gdb/ChangeLog:

2019-09-29  Christian Biesinger  <cbiesinger@google.com>

	* coffread.c (record_minimal_symbol): Update.
	(process_coff_symbol): Update.
	* dbxread.c (read_dbx_symtab): Update.
	* dwarf2read.c (add_partial_symbol): Update.
	(fixup_go_packaging): Update.
	(load_partial_dies): Update.
	(new_symbol): Update.
	* elfread.c (record_minimal_symbol): Update.
	* mdebugread.c (parse_partial_symbols): Update.
	(handle_psymbol_enumerators): Update.
	(new_symbol): Update.
	* minsyms.c (minimal_symbol_reader::record_full): Change signature
	to use gdb::string_view instead of name+len.
	* minsyms.h (class minimal_symbol_reader) <record_full>: Likewise.
	* psympriv.h (add_psymbol_to_list): Likewise.
	* psymtab.c (add_psymbol_to_bcache): Likewise.
	(add_psymbol_to_list): Likewise.
	* stabsread.c (define_symbol): Update.
	* symtab.c (symbol_set_names): Change signature to use gdb::string_view.
	* symtab.h (SYMBOL_SET_NAMES): Likewise.
	(symbol_set_names): Likewise.
	* xcoffread.c (scan_xcoff_symtab): Update.
---
 gdb/coffread.c   |  5 ++-
 gdb/dbxread.c    | 24 +++++++--------
 gdb/dwarf2read.c | 29 +++++++++---------
 gdb/elfread.c    |  4 +--
 gdb/mdebugread.c | 80 ++++++++++++++++++++++++++----------------------
 gdb/minsyms.c    | 20 ++++++------
 gdb/minsyms.h    | 10 +++---
 gdb/psympriv.h   | 16 +++++-----
 gdb/psymtab.c    |  8 ++---
 gdb/stabsread.c  |  5 +--
 gdb/symtab.c     | 28 +++++++++--------
 gdb/symtab.h     |  7 +++--
 gdb/xcoffread.c  | 42 +++++++++++++++----------
 13 files changed, 145 insertions(+), 133 deletions(-)

diff --git a/gdb/coffread.c b/gdb/coffread.c
index c44b69069e..52b9c57b9c 100644
--- a/gdb/coffread.c
+++ b/gdb/coffread.c
@@ -462,8 +462,7 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       return NULL;
     }
 
-  return reader.record_full (cs->c_name, strlen (cs->c_name), true, address,
-			     type, section);
+  return reader.record_full (cs->c_name, true, address, type, section);
 }
 \f
 /* coff_symfile_init ()
@@ -1569,7 +1568,7 @@ process_coff_symbol (struct coff_symbol *cs,
   name = EXTERNAL_NAME (name, objfile->obfd);
   SYMBOL_SET_LANGUAGE (sym, get_current_subfile ()->language,
 		       &objfile->objfile_obstack);
-  SYMBOL_SET_NAMES (sym, name, strlen (name), 1, objfile);
+  SYMBOL_SET_NAMES (sym, name, true, objfile);
 
   /* default assumptions */
   SYMBOL_VALUE (sym) = cs->c_value;
diff --git a/gdb/dbxread.c b/gdb/dbxread.c
index 564c5d3a41..16727ef108 100644
--- a/gdb/dbxread.c
+++ b/gdb/dbxread.c
@@ -1464,7 +1464,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	      if (gdbarch_static_transform_name_p (gdbarch))
 		gdbarch_static_transform_name (gdbarch, namestring);
 
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_STATIC,
 				   data_sect_index,
 				   psymbol_placement::STATIC,
@@ -1474,7 +1474,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	    case 'G':
 	      /* The addresses in these entries are reported to be
 		 wrong.  See the code that reads 'G's for symtabs.  */
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_STATIC,
 				   data_sect_index,
 				   psymbol_placement::GLOBAL,
@@ -1492,15 +1492,15 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  || (p == namestring + 1
 		      && namestring[0] != ' '))
 		{
-		  add_psymbol_to_list (sym_name, sym_len, true,
-				       STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+		  add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+				       true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 				       psymbol_placement::STATIC,
 				       0, psymtab_language, objfile);
 		  if (p[2] == 't')
 		    {
 		      /* Also a typedef with the same name.  */
-		      add_psymbol_to_list (sym_name, sym_len, true,
-					   VAR_DOMAIN, LOC_TYPEDEF, -1,
+		      add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+					   true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					   psymbol_placement::STATIC,
 					   0, psymtab_language, objfile);
 		      p += 1;
@@ -1511,8 +1511,8 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	    case 't':
 	      if (p != namestring)	/* a name is there, not just :T...  */
 		{
-		  add_psymbol_to_list (sym_name, sym_len, true,
-				       VAR_DOMAIN, LOC_TYPEDEF, -1,
+		  add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+				       true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 				       psymbol_placement::STATIC,
 				       0, psymtab_language, objfile);
 		}
@@ -1572,7 +1572,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 			;
 		      /* Note that the value doesn't matter for
 			 enum constants in psymtabs, just in symtabs.  */
-		      add_psymbol_to_list (p, q - p, true,
+		      add_psymbol_to_list (gdb::string_view (p, q - p), true,
 					   VAR_DOMAIN, LOC_CONST, -1,
 					   psymbol_placement::STATIC, 0,
 					   psymtab_language, objfile);
@@ -1590,7 +1590,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 
 	    case 'c':
 	      /* Constant, e.g. from "const" in Pascal.  */
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_CONST, -1,
 				   psymbol_placement::STATIC, 0,
 				   psymtab_language, objfile);
@@ -1645,7 +1645,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  pst->set_text_low (nlist.n_value);
 		  textlow_not_set = 0;
 		}
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_BLOCK,
 				   SECT_OFF_TEXT (objfile),
 				   psymbol_placement::STATIC,
@@ -1704,7 +1704,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  pst->set_text_low (nlist.n_value);
 		  textlow_not_set = 0;
 		}
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_BLOCK,
 				   SECT_OFF_TEXT (objfile),
 				   psymbol_placement::GLOBAL,
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 1052501c35..ff0fc7a06a 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -8922,7 +8922,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
              of the global scope.  But in Ada, we want to be able to access
              nested procedures globally.  So all Ada subprograms are stored
              in the global scope.  */
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_BLOCK,
 			       SECT_OFF_TEXT (objfile),
@@ -8932,7 +8932,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	}
       else
 	{
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_BLOCK,
 			       SECT_OFF_TEXT (objfile),
@@ -8944,7 +8944,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	set_objfile_main_name (objfile, actual_name, cu->language);
       break;
     case DW_TAG_constant:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
 			   -1, (pdi->is_external
 				? psymbol_placement::GLOBAL
@@ -8980,7 +8980,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	     table building.  */
 
 	  if (pdi->d.locdesc || pdi->has_type)
-	    add_psymbol_to_list (actual_name, strlen (actual_name),
+	    add_psymbol_to_list (actual_name,
 				 built_actual_name != NULL,
 				 VAR_DOMAIN, LOC_STATIC,
 				 SECT_OFF_TEXT (objfile),
@@ -8999,7 +8999,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	      return;
 	    }
 
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_STATIC,
 			       SECT_OFF_TEXT (objfile),
@@ -9011,7 +9011,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
     case DW_TAG_typedef:
     case DW_TAG_base_type:
     case DW_TAG_subrange_type:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_TYPEDEF, -1,
 			   psymbol_placement::STATIC,
@@ -9019,7 +9019,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
       break;
     case DW_TAG_imported_declaration:
     case DW_TAG_namespace:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_TYPEDEF, -1,
 			   psymbol_placement::GLOBAL,
@@ -9030,7 +9030,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
          available without any name.  If so, we skip the module as it
          doesn't bring any value.  */
       if (actual_name != nullptr)
-	add_psymbol_to_list (actual_name, strlen (actual_name),
+	add_psymbol_to_list (actual_name,
 			     built_actual_name != NULL,
 			     MODULE_DOMAIN, LOC_TYPEDEF, -1,
 			     psymbol_placement::GLOBAL,
@@ -9054,7 +9054,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 
       /* NOTE: carlton/2003-10-07: See comment in new_symbol about
 	 static vs. global.  */
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 			   cu->language == language_cplus
@@ -9064,7 +9064,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 
       break;
     case DW_TAG_enumerator:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_CONST, -1,
 			   cu->language == language_cplus
@@ -9888,8 +9888,7 @@ fixup_go_packaging (struct dwarf2_cu *cu)
 
       sym = allocate_symbol (objfile);
       SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
-      SYMBOL_SET_NAMES (sym, saved_package_name,
-			strlen (saved_package_name), 0, objfile);
+      SYMBOL_SET_NAMES (sym, saved_package_name, false, objfile);
       /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
 	 e.g., "main" finds the "main" module and not C's main().  */
       SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
@@ -18533,7 +18532,7 @@ load_partial_dies (const struct die_reader_specs *reader,
 	      || pdi.tag == DW_TAG_subrange_type))
 	{
 	  if (building_psymtab && pdi.name != NULL)
-	    add_psymbol_to_list (pdi.name, strlen (pdi.name), false,
+	    add_psymbol_to_list (pdi.name, false,
 				 VAR_DOMAIN, LOC_TYPEDEF, -1,
 				 psymbol_placement::STATIC,
 				 0, cu->language, objfile);
@@ -18567,7 +18566,7 @@ load_partial_dies (const struct die_reader_specs *reader,
 	  if (pdi.name == NULL)
 	    complaint (_("malformed enumerator DIE ignored"));
 	  else if (building_psymtab)
-	    add_psymbol_to_list (pdi.name, strlen (pdi.name), false,
+	    add_psymbol_to_list (pdi.name, false,
 				 VAR_DOMAIN, LOC_CONST, -1,
 				 cu->language == language_cplus
 				 ? psymbol_placement::GLOBAL
@@ -21551,7 +21550,7 @@ new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
       /* Cache this symbol's name and the name's demangled form (if any).  */
       SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
       linkagename = dwarf2_physname (name, die, cu);
-      SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
+      SYMBOL_SET_NAMES (sym, linkagename, false, objfile);
 
       /* Fortran does not have mangling standard and the mangling does differ
 	 between gfortran, iFort etc.  */
diff --git a/gdb/elfread.c b/gdb/elfread.c
index a3d17e54a2..04b36d3dba 100644
--- a/gdb/elfread.c
+++ b/gdb/elfread.c
@@ -203,8 +203,8 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       || ms_type == mst_text_gnu_ifunc)
     address = gdbarch_addr_bits_remove (gdbarch, address);
 
-  return reader.record_full (name, name_len, copy_name, address,
-			     ms_type,
+  return reader.record_full (gdb::string_view (name, name_len), copy_name,
+			     address, ms_type,
 			     gdb_bfd_section_index (objfile->obfd,
 						    bfd_section));
 }
diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index 0956fbdb67..5921251f65 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -3048,8 +3048,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			  namestring = gdbarch_static_transform_name
 					 (gdbarch, namestring);
 
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_STATIC,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_STATIC,
 					     SECT_OFF_DATA (objfile),
 					     psymbol_placement::STATIC,
 					     sh.value,
@@ -3059,8 +3060,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			/* The addresses in these entries are reported
 			   to be wrong.  See the code that reads 'G's
 			   for symtabs.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_STATIC,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_STATIC,
 					     SECT_OFF_DATA (objfile),
 					     psymbol_placement::GLOBAL,
 					     sh.value,
@@ -3078,21 +3080,20 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    || (p == namestring + 1
 				&& namestring[0] != ' '))
 			  {
-			    add_psymbol_to_list (namestring, p - namestring, true,
-						 STRUCT_DOMAIN, LOC_TYPEDEF,
-						 -1,
-						 psymbol_placement::STATIC,
-						 0, psymtab_language, objfile);
+			    add_psymbol_to_list
+			      (gdb::string_view (namestring, p - namestring),
+			       true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+			       psymbol_placement::STATIC, 0, psymtab_language,
+			       objfile);
 			    if (p[2] == 't')
 			      {
 				/* Also a typedef with the same name.  */
-				add_psymbol_to_list (namestring,
-						     p - namestring, true,
-						     VAR_DOMAIN, LOC_TYPEDEF,
-						     -1,
-						     psymbol_placement::STATIC,
-						     0, psymtab_language,
-						     objfile);
+				add_psymbol_to_list
+				  (gdb::string_view (namestring,
+						     p - namestring),
+				   true, VAR_DOMAIN, LOC_TYPEDEF, -1,
+				   psymbol_placement::STATIC, 0,
+				   psymtab_language, objfile);
 				p += 1;
 			      }
 			  }
@@ -3101,11 +3102,12 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			if (p != namestring)	/* a name is there, not
 						   just :T...  */
 			  {
-			    add_psymbol_to_list (namestring, p - namestring,
-						 true, VAR_DOMAIN, LOC_TYPEDEF,
-						 -1,
-						 psymbol_placement::STATIC,
-						 0, psymtab_language, objfile);
+			    add_psymbol_to_list
+			      (gdb::string_view (namestring,
+						 p - namestring),
+			       true, VAR_DOMAIN, LOC_TYPEDEF, -1,
+			       psymbol_placement::STATIC, 0, psymtab_language,
+			       objfile);
 			  }
 		      check_enum:
 			/* If this is an enumerated type, we need to add
@@ -3166,9 +3168,10 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 				/* Note that the value doesn't matter for
 				   enum constants in psymtabs, just in
 				   symtabs.  */
-				add_psymbol_to_list (p, q - p, true,
-						     VAR_DOMAIN, LOC_CONST,
-						     -1,
+				add_psymbol_to_list (gdb::string_view (p,
+								       q - p),
+						     true, VAR_DOMAIN,
+						     LOC_CONST, -1,
 						     psymbol_placement::STATIC,
 						     0, psymtab_language,
 						     objfile);
@@ -3185,8 +3188,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			continue;
 		      case 'c':
 			/* Constant, e.g. from "const" in Pascal.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_CONST, -1,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_CONST, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
 			continue;
@@ -3198,8 +3202,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    function_outside_compilation_unit_complaint
 			      (copy.c_str ());
 			  }
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_BLOCK,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_BLOCK,
 					     SECT_OFF_TEXT (objfile),
 					     psymbol_placement::STATIC,
 					     sh.value,
@@ -3217,8 +3222,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    function_outside_compilation_unit_complaint
 			      (copy.c_str ());
 			  }
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_BLOCK,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_BLOCK,
 					     SECT_OFF_TEXT (objfile),
 					     psymbol_placement::GLOBAL,
 					     sh.value,
@@ -3452,13 +3458,13 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		     symbol table, and the MAIN__ symbol via the minimal
 		     symbol table.  */
 		  if (sh.st == stProc)
-		    add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		    add_psymbol_to_list (sym_name, true,
 					 VAR_DOMAIN, LOC_BLOCK,
 					 section,
 					 psymbol_placement::GLOBAL,
 					 sh.value, psymtab_language, objfile);
 		  else
-		    add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		    add_psymbol_to_list (sym_name, true,
 					 VAR_DOMAIN, LOC_BLOCK,
 					 section,
 					 psymbol_placement::STATIC,
@@ -3525,7 +3531,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		      && sh.iss != 0
 		      && sh.index != cur_sdx + 2)
 		    {
-		      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		      add_psymbol_to_list (sym_name, true,
 					   STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 					   psymbol_placement::STATIC,
 					   0, psymtab_language, objfile);
@@ -3565,7 +3571,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		  continue;
 		}
 	      /* Use this gdb symbol.  */
-	      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+	      add_psymbol_to_list (sym_name, true,
 				   VAR_DOMAIN, theclass, section,
 				   psymbol_placement::STATIC,
 				   sh.value, psymtab_language, objfile);
@@ -3644,7 +3650,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		  break;
 		}
 	      char *sym_name = debug_info->ssext + psh->iss;
-	      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+	      add_psymbol_to_list (sym_name, true,
 				   VAR_DOMAIN, theclass,
 				   section,
 				   psymbol_placement::GLOBAL,
@@ -3807,7 +3813,7 @@ handle_psymbol_enumerators (struct objfile *objfile, FDR *fh, int stype,
 
       /* Note that the value doesn't matter for enum constants
          in psymtabs, just in symtabs.  */
-      add_psymbol_to_list (name, strlen (name), true,
+      add_psymbol_to_list (name, true,
 			   VAR_DOMAIN, LOC_CONST, -1,
 			   psymbol_placement::STATIC, 0,
 			   psymtab_language, objfile);
@@ -4758,7 +4764,7 @@ new_symbol (const char *name)
 
   SYMBOL_SET_LANGUAGE (s, psymtab_language,
 		       &mdebugread_objfile->objfile_obstack);
-  SYMBOL_SET_NAMES (s, name, strlen (name), 1, mdebugread_objfile);
+  SYMBOL_SET_NAMES (s, name, true, mdebugread_objfile);
   return s;
 }
 
diff --git a/gdb/minsyms.c b/gdb/minsyms.c
index 83f5d89577..379877dc26 100644
--- a/gdb/minsyms.c
+++ b/gdb/minsyms.c
@@ -1063,7 +1063,7 @@ mst_str (minimal_symbol_type t)
 /* See minsyms.h.  */
 
 struct minimal_symbol *
-minimal_symbol_reader::record_full (const char *name, int name_len,
+minimal_symbol_reader::record_full (gdb::string_view name,
 				    bool copy_name, CORE_ADDR address,
 				    enum minimal_symbol_type ms_type,
 				    int section)
@@ -1077,24 +1077,22 @@ minimal_symbol_reader::record_full (const char *name, int name_len,
      lookup_minimal_symbol_by_pc would have no way of getting the
      right one.  */
   if (ms_type == mst_file_text && name[0] == 'g'
-      && (strcmp (name, GCC_COMPILED_FLAG_SYMBOL) == 0
-	  || strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0))
+      && (name == GCC_COMPILED_FLAG_SYMBOL
+	  || name == GCC2_COMPILED_FLAG_SYMBOL))
     return (NULL);
 
   /* It's safe to strip the leading char here once, since the name
      is also stored stripped in the minimal symbol table.  */
   if (name[0] == get_symbol_leading_char (m_objfile->obfd))
-    {
-      ++name;
-      --name_len;
-    }
+    name = name.substr (1);
 
-  if (ms_type == mst_file_text && startswith (name, "__gnu_compiled"))
+  if (ms_type == mst_file_text && startswith (name.data (), "__gnu_compiled"))
     return (NULL);
 
   if (symtab_create_debug >= 2)
-    printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %s\n",
-               mst_str (ms_type), hex_string (address), section, name);
+    printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %.*s\n",
+               mst_str (ms_type), hex_string (address), section,
+	       (int) name.size (), name.data ());
 
   if (m_msym_bunch_index == BUNCH_SIZE)
     {
@@ -1106,7 +1104,7 @@ minimal_symbol_reader::record_full (const char *name, int name_len,
   msymbol = &m_msym_bunch->contents[m_msym_bunch_index];
   symbol_set_language (msymbol, language_auto,
 		       &m_objfile->per_bfd->storage_obstack);
-  symbol_set_names (msymbol, name, name_len, copy_name, m_objfile->per_bfd);
+  symbol_set_names (msymbol, name, copy_name, m_objfile->per_bfd);
 
   SET_MSYMBOL_VALUE_ADDRESS (msymbol, address);
   MSYMBOL_SECTION (msymbol) = section;
diff --git a/gdb/minsyms.h b/gdb/minsyms.h
index ce4b83d544..f62a2b9914 100644
--- a/gdb/minsyms.h
+++ b/gdb/minsyms.h
@@ -88,7 +88,6 @@ class minimal_symbol_reader
      Arguments are:
 
      NAME - the symbol's name
-     NAME_LEN - the length of the name
      COPY_NAME - if true, the minsym code must make a copy of NAME.  If
      false, then NAME must be NUL-terminated, and must have a lifetime
      that is at least as long as OBJFILE's lifetime.
@@ -97,15 +96,14 @@ class minimal_symbol_reader
      SECTION - the symbol's section
   */
 
-  struct minimal_symbol *record_full (const char *name,
-				      int name_len,
+  struct minimal_symbol *record_full (gdb::string_view name,
 				      bool copy_name,
 				      CORE_ADDR address,
 				      enum minimal_symbol_type ms_type,
 				      int section);
 
   /* Like record_full, but:
-     - uses strlen to compute NAME_LEN,
+     - computes the length of NAME
      - passes COPY_NAME = true,
      - and passes a default SECTION, depending on the type
 
@@ -115,7 +113,7 @@ class minimal_symbol_reader
 	       enum minimal_symbol_type ms_type);
 
   /* Like record_full, but:
-     - uses strlen to compute NAME_LEN,
+     - computes the length of NAME
      - passes COPY_NAME = true.
 
      This variant does not return the new symbol.  */
@@ -124,7 +122,7 @@ class minimal_symbol_reader
 			 enum minimal_symbol_type ms_type,
 			 int section)
   {
-    record_full (name, strlen (name), true, address, ms_type, section);
+    record_full (name, true, address, ms_type, section);
   }
 
  private:
diff --git a/gdb/psympriv.h b/gdb/psympriv.h
index 3e89742d8d..9404c46837 100644
--- a/gdb/psympriv.h
+++ b/gdb/psympriv.h
@@ -22,6 +22,7 @@
 
 #include "psymtab.h"
 #include "objfiles.h"
+#include "gdbsupport/gdb_string_view.h"
 
 /* A partial_symbol records the name, domain, and address class of
    symbols whose types we have not parsed yet.  For functions, it also
@@ -304,14 +305,13 @@ enum class psymbol_placement
    LANGUAGE is the language from which the symbol originates.  This will
    influence, amongst other things, how the symbol name is demangled. */
 
-extern void add_psymbol_to_list (const char *name, int namelength,
-				 bool copy_name, domain_enum domain,
-				 enum address_class theclass,
-				 short section,
-				 psymbol_placement where,
-				 CORE_ADDR coreaddr,
-				 enum language language,
-				 struct objfile *objfile);
+extern void add_psymbol_to_list (gdb::string_view,
+				 bool, domain_enum,
+				 enum address_class,
+				 short /* section */,
+				 enum psymbol_placement,
+				 CORE_ADDR,
+				 enum language, struct objfile *);
 
 /* Initialize storage for partial symbols.  If partial symbol storage
    has already been initialized, this does nothing.  TOTAL_SYMBOLS is
diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index 31b6d59777..b30d29e6ef 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -1568,7 +1568,7 @@ psymbol_compare (const void *addr1, const void *addr2, int length)
    different domain (or address) is possible and correct.  */
 
 static struct partial_symbol *
-add_psymbol_to_bcache (const char *name, int namelength, bool copy_name,
+add_psymbol_to_bcache (gdb::string_view name, bool copy_name,
 		       domain_enum domain,
 		       enum address_class theclass,
 		       short section,
@@ -1585,7 +1585,7 @@ add_psymbol_to_bcache (const char *name, int namelength, bool copy_name,
   psymbol.aclass = theclass;
   symbol_set_language (&psymbol.ginfo, language,
 		       objfile->partial_symtabs->obstack ());
-  symbol_set_names (&psymbol.ginfo, name, namelength, copy_name,
+  symbol_set_names (&psymbol.ginfo, name, copy_name,
 		    objfile->per_bfd);
 
   /* Stash the partial symbol away in the cache.  */
@@ -1608,7 +1608,7 @@ append_psymbol_to_list (std::vector<partial_symbol *> *list,
 /* See psympriv.h.  */
 
 void
-add_psymbol_to_list (const char *name, int namelength, bool copy_name,
+add_psymbol_to_list (gdb::string_view name, bool copy_name,
 		     domain_enum domain,
 		     enum address_class theclass,
 		     short section,
@@ -1621,7 +1621,7 @@ add_psymbol_to_list (const char *name, int namelength, bool copy_name,
   int added;
 
   /* Stash the partial symbol away in the cache.  */
-  psym = add_psymbol_to_bcache (name, namelength, copy_name, domain, theclass,
+  psym = add_psymbol_to_bcache (name, copy_name, domain, theclass,
 				section, coreaddr, language, objfile, &added);
 
   /* Do not duplicate global partial symbols.  */
diff --git a/gdb/stabsread.c b/gdb/stabsread.c
index 48c88ded55..d8cb4a5264 100644
--- a/gdb/stabsread.c
+++ b/gdb/stabsread.c
@@ -751,11 +751,12 @@ define_symbol (CORE_ADDR valu, const char *string, int desc, int type,
       if (!new_name.empty ())
 	{
 	  SYMBOL_SET_NAMES (sym,
-			    new_name.c_str (), new_name.length (),
+			    new_name,
 			    1, objfile);
 	}
       else
-	SYMBOL_SET_NAMES (sym, string, p - string, 1, objfile);
+	SYMBOL_SET_NAMES (sym, gdb::string_view (string, p - string), true,
+			  objfile);
 
       if (SYMBOL_LANGUAGE (sym) == language_cplus)
 	cp_scan_for_anonymous_namespaces (get_buildsym_compunit (), sym,
diff --git a/gdb/symtab.c b/gdb/symtab.c
index 6ea9fc6971..25f714a0f4 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -811,7 +811,7 @@ symbol_find_demangled_name (struct general_symbol_info *gsymbol,
 
 void
 symbol_set_names (struct general_symbol_info *gsymbol,
-		  const char *linkage_name, int len, bool copy_name,
+		  gdb::string_view linkage_name, bool copy_name,
 		  struct objfile_per_bfd_storage *per_bfd)
 {
   struct demangled_name_entry **slot;
@@ -824,14 +824,14 @@ symbol_set_names (struct general_symbol_info *gsymbol,
       /* In Ada, we do the symbol lookups using the mangled name, so
          we can save some space by not storing the demangled name.  */
       if (!copy_name)
-	gsymbol->name = linkage_name;
+	gsymbol->name = linkage_name.data ();
       else
 	{
 	  char *name = (char *) obstack_alloc (&per_bfd->storage_obstack,
-					       len + 1);
+					       linkage_name.length () + 1);
 
-	  memcpy (name, linkage_name, len);
-	  name[len] = '\0';
+	  memcpy (name, linkage_name.data (), linkage_name.length ());
+	  name[linkage_name.length ()] = '\0';
 	  gsymbol->name = name;
 	}
       symbol_set_demangled_name (gsymbol, NULL, &per_bfd->storage_obstack);
@@ -842,18 +842,20 @@ symbol_set_names (struct general_symbol_info *gsymbol,
   if (per_bfd->demangled_names_hash == NULL)
     create_demangled_names_hash (per_bfd);
 
-  if (linkage_name[len] != '\0')
+  /* Don't use string_view::operator[] because we are accessing beyond
+     the size of the string_view, which is technically unsupported.  */
+  if (linkage_name.data ()[linkage_name.length ()] != '\0')
     {
       char *alloc_name;
 
-      alloc_name = (char *) alloca (len + 1);
-      memcpy (alloc_name, linkage_name, len);
-      alloc_name[len] = '\0';
+      alloc_name = (char *) alloca (linkage_name.length () + 1);
+      memcpy (alloc_name, linkage_name.data (), linkage_name.length ());
+      alloc_name[linkage_name.length ()] = '\0';
 
       linkage_name_copy = alloc_name;
     }
   else
-    linkage_name_copy = linkage_name;
+    linkage_name_copy = linkage_name.data ();
 
   entry.mangled = linkage_name_copy;
   slot = ((struct demangled_name_entry **)
@@ -881,14 +883,14 @@ symbol_set_names (struct general_symbol_info *gsymbol,
 	 It turns out that it is actually important to still save such
 	 an entry in the hash table, because storing this name gives
 	 us better bcache hit rates for partial symbols.  */
-      if (!copy_name && linkage_name_copy == linkage_name)
+      if (!copy_name && linkage_name_copy == linkage_name.data ())
 	{
 	  *slot
 	    = ((struct demangled_name_entry *)
 	       obstack_alloc (&per_bfd->storage_obstack,
 			      offsetof (struct demangled_name_entry, demangled)
 			      + demangled_len + 1));
-	  (*slot)->mangled = linkage_name;
+	  (*slot)->mangled = linkage_name.data ();
 	}
       else
 	{
@@ -901,7 +903,7 @@ symbol_set_names (struct general_symbol_info *gsymbol,
 	    = ((struct demangled_name_entry *)
 	       obstack_alloc (&per_bfd->storage_obstack,
 			      offsetof (struct demangled_name_entry, demangled)
-			      + len + demangled_len + 2));
+			      + linkage_name.length () + demangled_len + 2));
 	  mangled_ptr = &((*slot)->demangled[demangled_len + 1]);
 	  strcpy (mangled_ptr, linkage_name_copy);
 	  (*slot)->mangled = mangled_ptr;
diff --git a/gdb/symtab.h b/gdb/symtab.h
index 1f0fc62a65..1546d83029 100644
--- a/gdb/symtab.h
+++ b/gdb/symtab.h
@@ -29,6 +29,7 @@
 #include "gdbsupport/enum-flags.h"
 #include "gdbsupport/function-view.h"
 #include "gdbsupport/gdb_optional.h"
+#include "gdbsupport/gdb_string_view.h"
 #include "gdbsupport/next-iterator.h"
 #include "completer.h"
 
@@ -493,11 +494,11 @@ extern void symbol_set_language (struct general_symbol_info *symbol,
 
 /* Set the linkage and natural names of a symbol, by demangling
    the linkage name.  */
-#define SYMBOL_SET_NAMES(symbol,linkage_name,len,copy_name,objfile)	\
-  symbol_set_names (&(symbol)->ginfo, linkage_name, len, copy_name, \
+#define SYMBOL_SET_NAMES(symbol,linkage_name,copy_name,objfile)	\
+  symbol_set_names (&(symbol)->ginfo, linkage_name, copy_name, \
 		    (objfile)->per_bfd)
 extern void symbol_set_names (struct general_symbol_info *symbol,
-			      const char *linkage_name, int len, bool copy_name,
+			      gdb::string_view linkage_name, bool copy_name,
 			      struct objfile_per_bfd_storage *per_bfd);
 
 /* Now come lots of name accessor macros.  Short version as to when to
diff --git a/gdb/xcoffread.c b/gdb/xcoffread.c
index 2fa2706653..52a700215d 100644
--- a/gdb/xcoffread.c
+++ b/gdb/xcoffread.c
@@ -2644,8 +2644,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		  namestring = gdbarch_static_transform_name
 				 (gdbarch, namestring);
 
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_STATIC,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_STATIC,
 				     SECT_OFF_DATA (objfile),
 				     psymbol_placement::STATIC,
 				     symbol.n_value,
@@ -2655,8 +2656,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 	      case 'G':
 		/* The addresses in these entries are reported to be
 		   wrong.  See the code that reads 'G's for symtabs.  */
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_STATIC,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_STATIC,
 				     SECT_OFF_DATA (objfile),
 				     psymbol_placement::GLOBAL,
 				     symbol.n_value,
@@ -2674,15 +2676,17 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		    || (p == namestring + 1
 			&& namestring[0] != ' '))
 		  {
-		    add_psymbol_to_list (namestring, p - namestring, true,
-					 STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+		    add_psymbol_to_list (gdb::string_view (namestring,
+							   p - namestring),
+					 true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 					 psymbol_placement::STATIC,
 					 0, psymtab_language, objfile);
 		    if (p[2] == 't')
 		      {
 			/* Also a typedef with the same name.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_TYPEDEF, -1,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
 			p += 1;
@@ -2693,8 +2697,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 	      case 't':
 		if (p != namestring)	/* a name is there, not just :T...  */
 		  {
-		    add_psymbol_to_list (namestring, p - namestring, true,
-					 VAR_DOMAIN, LOC_TYPEDEF, -1,
+		    add_psymbol_to_list (gdb::string_view (namestring,
+							   p - namestring),
+					 true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					 psymbol_placement::STATIC,
 					 0, psymtab_language, objfile);
 		  }
@@ -2755,7 +2760,7 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 			  ;
 			/* Note that the value doesn't matter for
 			   enum constants in psymtabs, just in symtabs.  */
-			add_psymbol_to_list (p, q - p, true,
+			add_psymbol_to_list (gdb::string_view (p, q - p), true,
 					     VAR_DOMAIN, LOC_CONST, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
@@ -2773,8 +2778,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 
 	      case 'c':
 		/* Constant, e.g. from "const" in Pascal.  */
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_CONST, -1,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_CONST, -1,
 				     psymbol_placement::STATIC,
 				     0, psymtab_language, objfile);
 		continue;
@@ -2790,8 +2796,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		    function_outside_compilation_unit_complaint (name);
 		    xfree (name);
 		  }
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_BLOCK,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_BLOCK,
 				     SECT_OFF_TEXT (objfile),
 				     psymbol_placement::STATIC,
 				     symbol.n_value,
@@ -2820,8 +2827,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		if (startswith (namestring, "@FIX"))
 		  continue;
 
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_BLOCK,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_BLOCK,
 				     SECT_OFF_TEXT (objfile),
 				     psymbol_placement::GLOBAL,
 				     symbol.n_value,
-- 
2.23.0.444.g18eeb5a265-goog

Re: [PATCH] Change some arguments to gdb::string_view instead of name+len

[Pedro Alves]

On 10/1/19 6:33 PM, Christian Biesinger via gdb-patches wrote:
> -  if (linkage_name[len] != '\0')
> +  /* Don't use string_view::operator[] because we are accessing beyond
> +     the size of the string_view, which is technically unsupported.  */
> +  if (linkage_name.data ()[linkage_name.length ()] != '\0')
>      {
>        char *alloc_name;

It's more than just unsupported, it's undefined behavior.  If we're promising
the string_view interface, then it's supposedly valid to pass in a string_view
that happens to point just at the end of a page, with the one-past-the-end
byte living in an unmapped page.  Dereferencing the one-past-end byte in
that case SIGSEGVs.

> -  if (ms_type == mst_file_text && startswith (name, "__gnu_compiled"))
> +  if (ms_type == mst_file_text && startswith (name.data (), "__gnu_compiled"))
>      return (NULL);
>  

This, via startswith also assumes that name.data() is a null-terminated
string.

I wonder whether we should have a zstring_view type.  like string_view, but
assumes/requires null-terminated.

Thanks,
Pedro Alves

Re: [PATCH] Change some arguments to gdb::string_view instead of name+len

[Christian Biesinger via gdb-patches]

On Tue, Oct 1, 2019 at 1:23 PM Pedro Alves <palves@redhat.com> wrote:
>
> On 10/1/19 6:33 PM, Christian Biesinger via gdb-patches wrote:
> > -  if (linkage_name[len] != '\0')
> > +  /* Don't use string_view::operator[] because we are accessing beyond
> > +     the size of the string_view, which is technically unsupported.  */
> > +  if (linkage_name.data ()[linkage_name.length ()] != '\0')
> >      {
> >        char *alloc_name;
>
> It's more than just unsupported, it's undefined behavior.  If we're promising
> the string_view interface, then it's supposedly valid to pass in a string_view
> that happens to point just at the end of a page, with the one-past-the-end
> byte living in an unmapped page.  Dereferencing the one-past-end byte in
> that case SIGSEGVs.

That's true (though also a pre-existing issue).

> > -  if (ms_type == mst_file_text && startswith (name, "__gnu_compiled"))
> > +  if (ms_type == mst_file_text && startswith (name.data (), "__gnu_compiled"))
> >      return (NULL);
> >
>
> This, via startswith also assumes that name.data() is a null-terminated
> string.

Ah yes. I'll add a startswith version that takes string_views.

> I wonder whether we should have a zstring_view type.  like string_view, but
> assumes/requires null-terminated.

How does that solve anything? This function can (apparently) take
non-null terminated strings, so zstring_view wouldn't work?

Christian

[PATCH] Change some arguments to gdb::string_view instead of name+len

[Christian Biesinger via gdb-patches]

Just some code cleanup. This change has a few benefits:
- Shorter argument list in the functions
- If the caller needs to calculate the string, they no longer
  need to explicitly call strlen
- It is easy to pass std::string to this (done in one place
  currently)

This also updates a couple of places that were passing 0/1 to
a bool parameter.

gdb/ChangeLog:

2019-09-29  Christian Biesinger  <cbiesinger@google.com>

	* coffread.c (record_minimal_symbol): Update.
	(process_coff_symbol): Update.
	* dbxread.c (read_dbx_symtab): Update.
	* dwarf2read.c (add_partial_symbol): Update.
	(fixup_go_packaging): Update.
	(load_partial_dies): Update.
	(new_symbol): Update.
	* elfread.c (record_minimal_symbol): Update.
	* mdebugread.c (parse_partial_symbols): Update.
	(handle_psymbol_enumerators): Update.
	(new_symbol): Update.
	* minsyms.c (minimal_symbol_reader::record_full): Change signature
	to use gdb::string_view instead of name+len.
	* minsyms.h (class minimal_symbol_reader) <record_full>: Likewise.
	* psympriv.h (add_psymbol_to_list): Likewise.
	* psymtab.c (add_psymbol_to_bcache): Likewise.
	(add_psymbol_to_list): Likewise.
	* stabsread.c (define_symbol): Update.
	* symtab.c (symbol_set_names): Change signature to use gdb::string_view.
	* symtab.h (SYMBOL_SET_NAMES): Likewise.
	(symbol_set_names): Likewise.
	* xcoffread.c (scan_xcoff_symtab): Update.
---
 gdb/coffread.c                |  5 +--
 gdb/dbxread.c                 | 24 +++++------
 gdb/dwarf2read.c              | 29 ++++++-------
 gdb/elfread.c                 |  4 +-
 gdb/gdbsupport/common-utils.h | 12 +++++-
 gdb/mdebugread.c              | 80 +++++++++++++++++++----------------
 gdb/minsyms.c                 | 18 ++++----
 gdb/minsyms.h                 | 10 ++---
 gdb/psympriv.h                | 16 +++----
 gdb/psymtab.c                 |  8 ++--
 gdb/stabsread.c               |  5 ++-
 gdb/symtab.c                  | 28 ++++++------
 gdb/symtab.h                  |  7 +--
 gdb/xcoffread.c               | 42 ++++++++++--------
 14 files changed, 155 insertions(+), 133 deletions(-)

diff --git a/gdb/coffread.c b/gdb/coffread.c
index c44b69069e..52b9c57b9c 100644
--- a/gdb/coffread.c
+++ b/gdb/coffread.c
@@ -462,8 +462,7 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       return NULL;
     }
 
-  return reader.record_full (cs->c_name, strlen (cs->c_name), true, address,
-			     type, section);
+  return reader.record_full (cs->c_name, true, address, type, section);
 }
 \f
 /* coff_symfile_init ()
@@ -1569,7 +1568,7 @@ process_coff_symbol (struct coff_symbol *cs,
   name = EXTERNAL_NAME (name, objfile->obfd);
   SYMBOL_SET_LANGUAGE (sym, get_current_subfile ()->language,
 		       &objfile->objfile_obstack);
-  SYMBOL_SET_NAMES (sym, name, strlen (name), 1, objfile);
+  SYMBOL_SET_NAMES (sym, name, true, objfile);
 
   /* default assumptions */
   SYMBOL_VALUE (sym) = cs->c_value;
diff --git a/gdb/dbxread.c b/gdb/dbxread.c
index 564c5d3a41..16727ef108 100644
--- a/gdb/dbxread.c
+++ b/gdb/dbxread.c
@@ -1464,7 +1464,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	      if (gdbarch_static_transform_name_p (gdbarch))
 		gdbarch_static_transform_name (gdbarch, namestring);
 
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_STATIC,
 				   data_sect_index,
 				   psymbol_placement::STATIC,
@@ -1474,7 +1474,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	    case 'G':
 	      /* The addresses in these entries are reported to be
 		 wrong.  See the code that reads 'G's for symtabs.  */
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_STATIC,
 				   data_sect_index,
 				   psymbol_placement::GLOBAL,
@@ -1492,15 +1492,15 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  || (p == namestring + 1
 		      && namestring[0] != ' '))
 		{
-		  add_psymbol_to_list (sym_name, sym_len, true,
-				       STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+		  add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+				       true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 				       psymbol_placement::STATIC,
 				       0, psymtab_language, objfile);
 		  if (p[2] == 't')
 		    {
 		      /* Also a typedef with the same name.  */
-		      add_psymbol_to_list (sym_name, sym_len, true,
-					   VAR_DOMAIN, LOC_TYPEDEF, -1,
+		      add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+					   true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					   psymbol_placement::STATIC,
 					   0, psymtab_language, objfile);
 		      p += 1;
@@ -1511,8 +1511,8 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 	    case 't':
 	      if (p != namestring)	/* a name is there, not just :T...  */
 		{
-		  add_psymbol_to_list (sym_name, sym_len, true,
-				       VAR_DOMAIN, LOC_TYPEDEF, -1,
+		  add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
+				       true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 				       psymbol_placement::STATIC,
 				       0, psymtab_language, objfile);
 		}
@@ -1572,7 +1572,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 			;
 		      /* Note that the value doesn't matter for
 			 enum constants in psymtabs, just in symtabs.  */
-		      add_psymbol_to_list (p, q - p, true,
+		      add_psymbol_to_list (gdb::string_view (p, q - p), true,
 					   VAR_DOMAIN, LOC_CONST, -1,
 					   psymbol_placement::STATIC, 0,
 					   psymtab_language, objfile);
@@ -1590,7 +1590,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 
 	    case 'c':
 	      /* Constant, e.g. from "const" in Pascal.  */
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_CONST, -1,
 				   psymbol_placement::STATIC, 0,
 				   psymtab_language, objfile);
@@ -1645,7 +1645,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  pst->set_text_low (nlist.n_value);
 		  textlow_not_set = 0;
 		}
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_BLOCK,
 				   SECT_OFF_TEXT (objfile),
 				   psymbol_placement::STATIC,
@@ -1704,7 +1704,7 @@ read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
 		  pst->set_text_low (nlist.n_value);
 		  textlow_not_set = 0;
 		}
-	      add_psymbol_to_list (sym_name, sym_len, true,
+	      add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
 				   VAR_DOMAIN, LOC_BLOCK,
 				   SECT_OFF_TEXT (objfile),
 				   psymbol_placement::GLOBAL,
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 1052501c35..ff0fc7a06a 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -8922,7 +8922,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
              of the global scope.  But in Ada, we want to be able to access
              nested procedures globally.  So all Ada subprograms are stored
              in the global scope.  */
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_BLOCK,
 			       SECT_OFF_TEXT (objfile),
@@ -8932,7 +8932,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	}
       else
 	{
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_BLOCK,
 			       SECT_OFF_TEXT (objfile),
@@ -8944,7 +8944,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	set_objfile_main_name (objfile, actual_name, cu->language);
       break;
     case DW_TAG_constant:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
 			   -1, (pdi->is_external
 				? psymbol_placement::GLOBAL
@@ -8980,7 +8980,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	     table building.  */
 
 	  if (pdi->d.locdesc || pdi->has_type)
-	    add_psymbol_to_list (actual_name, strlen (actual_name),
+	    add_psymbol_to_list (actual_name,
 				 built_actual_name != NULL,
 				 VAR_DOMAIN, LOC_STATIC,
 				 SECT_OFF_TEXT (objfile),
@@ -8999,7 +8999,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 	      return;
 	    }
 
-	  add_psymbol_to_list (actual_name, strlen (actual_name),
+	  add_psymbol_to_list (actual_name,
 			       built_actual_name != NULL,
 			       VAR_DOMAIN, LOC_STATIC,
 			       SECT_OFF_TEXT (objfile),
@@ -9011,7 +9011,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
     case DW_TAG_typedef:
     case DW_TAG_base_type:
     case DW_TAG_subrange_type:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_TYPEDEF, -1,
 			   psymbol_placement::STATIC,
@@ -9019,7 +9019,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
       break;
     case DW_TAG_imported_declaration:
     case DW_TAG_namespace:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_TYPEDEF, -1,
 			   psymbol_placement::GLOBAL,
@@ -9030,7 +9030,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
          available without any name.  If so, we skip the module as it
          doesn't bring any value.  */
       if (actual_name != nullptr)
-	add_psymbol_to_list (actual_name, strlen (actual_name),
+	add_psymbol_to_list (actual_name,
 			     built_actual_name != NULL,
 			     MODULE_DOMAIN, LOC_TYPEDEF, -1,
 			     psymbol_placement::GLOBAL,
@@ -9054,7 +9054,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 
       /* NOTE: carlton/2003-10-07: See comment in new_symbol about
 	 static vs. global.  */
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 			   cu->language == language_cplus
@@ -9064,7 +9064,7 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 
       break;
     case DW_TAG_enumerator:
-      add_psymbol_to_list (actual_name, strlen (actual_name),
+      add_psymbol_to_list (actual_name,
 			   built_actual_name != NULL,
 			   VAR_DOMAIN, LOC_CONST, -1,
 			   cu->language == language_cplus
@@ -9888,8 +9888,7 @@ fixup_go_packaging (struct dwarf2_cu *cu)
 
       sym = allocate_symbol (objfile);
       SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
-      SYMBOL_SET_NAMES (sym, saved_package_name,
-			strlen (saved_package_name), 0, objfile);
+      SYMBOL_SET_NAMES (sym, saved_package_name, false, objfile);
       /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
 	 e.g., "main" finds the "main" module and not C's main().  */
       SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
@@ -18533,7 +18532,7 @@ load_partial_dies (const struct die_reader_specs *reader,
 	      || pdi.tag == DW_TAG_subrange_type))
 	{
 	  if (building_psymtab && pdi.name != NULL)
-	    add_psymbol_to_list (pdi.name, strlen (pdi.name), false,
+	    add_psymbol_to_list (pdi.name, false,
 				 VAR_DOMAIN, LOC_TYPEDEF, -1,
 				 psymbol_placement::STATIC,
 				 0, cu->language, objfile);
@@ -18567,7 +18566,7 @@ load_partial_dies (const struct die_reader_specs *reader,
 	  if (pdi.name == NULL)
 	    complaint (_("malformed enumerator DIE ignored"));
 	  else if (building_psymtab)
-	    add_psymbol_to_list (pdi.name, strlen (pdi.name), false,
+	    add_psymbol_to_list (pdi.name, false,
 				 VAR_DOMAIN, LOC_CONST, -1,
 				 cu->language == language_cplus
 				 ? psymbol_placement::GLOBAL
@@ -21551,7 +21550,7 @@ new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
       /* Cache this symbol's name and the name's demangled form (if any).  */
       SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
       linkagename = dwarf2_physname (name, die, cu);
-      SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
+      SYMBOL_SET_NAMES (sym, linkagename, false, objfile);
 
       /* Fortran does not have mangling standard and the mangling does differ
 	 between gfortran, iFort etc.  */
diff --git a/gdb/elfread.c b/gdb/elfread.c
index a3d17e54a2..04b36d3dba 100644
--- a/gdb/elfread.c
+++ b/gdb/elfread.c
@@ -203,8 +203,8 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       || ms_type == mst_text_gnu_ifunc)
     address = gdbarch_addr_bits_remove (gdbarch, address);
 
-  return reader.record_full (name, name_len, copy_name, address,
-			     ms_type,
+  return reader.record_full (gdb::string_view (name, name_len), copy_name,
+			     address, ms_type,
 			     gdb_bfd_section_index (objfile->obfd,
 						    bfd_section));
 }
diff --git a/gdb/gdbsupport/common-utils.h b/gdb/gdbsupport/common-utils.h
index a5312cb0c4..dae9150ed4 100644
--- a/gdb/gdbsupport/common-utils.h
+++ b/gdb/gdbsupport/common-utils.h
@@ -113,12 +113,22 @@ extern char *safe_strerror (int);
 /* Return non-zero if the start of STRING matches PATTERN, zero
    otherwise.  */
 
-static inline int
+static inline bool
 startswith (const char *string, const char *pattern)
 {
   return strncmp (string, pattern, strlen (pattern)) == 0;
 }
 
+/* Version of startswith that takes string_view arguments.  See comment
+   above.  */
+
+static inline bool
+startswith (gdb::string_view string, gdb::string_view pattern)
+{
+  return string.length() >= pattern.length () &&
+    strncmp (string, pattern, pattern.length ()) == 0;
+}
+
 ULONGEST strtoulst (const char *num, const char **trailer, int base);
 
 /* Skip leading whitespace characters in INP, returning an updated
diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index 0956fbdb67..5921251f65 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -3048,8 +3048,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			  namestring = gdbarch_static_transform_name
 					 (gdbarch, namestring);
 
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_STATIC,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_STATIC,
 					     SECT_OFF_DATA (objfile),
 					     psymbol_placement::STATIC,
 					     sh.value,
@@ -3059,8 +3060,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			/* The addresses in these entries are reported
 			   to be wrong.  See the code that reads 'G's
 			   for symtabs.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_STATIC,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_STATIC,
 					     SECT_OFF_DATA (objfile),
 					     psymbol_placement::GLOBAL,
 					     sh.value,
@@ -3078,21 +3080,20 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    || (p == namestring + 1
 				&& namestring[0] != ' '))
 			  {
-			    add_psymbol_to_list (namestring, p - namestring, true,
-						 STRUCT_DOMAIN, LOC_TYPEDEF,
-						 -1,
-						 psymbol_placement::STATIC,
-						 0, psymtab_language, objfile);
+			    add_psymbol_to_list
+			      (gdb::string_view (namestring, p - namestring),
+			       true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+			       psymbol_placement::STATIC, 0, psymtab_language,
+			       objfile);
 			    if (p[2] == 't')
 			      {
 				/* Also a typedef with the same name.  */
-				add_psymbol_to_list (namestring,
-						     p - namestring, true,
-						     VAR_DOMAIN, LOC_TYPEDEF,
-						     -1,
-						     psymbol_placement::STATIC,
-						     0, psymtab_language,
-						     objfile);
+				add_psymbol_to_list
+				  (gdb::string_view (namestring,
+						     p - namestring),
+				   true, VAR_DOMAIN, LOC_TYPEDEF, -1,
+				   psymbol_placement::STATIC, 0,
+				   psymtab_language, objfile);
 				p += 1;
 			      }
 			  }
@@ -3101,11 +3102,12 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			if (p != namestring)	/* a name is there, not
 						   just :T...  */
 			  {
-			    add_psymbol_to_list (namestring, p - namestring,
-						 true, VAR_DOMAIN, LOC_TYPEDEF,
-						 -1,
-						 psymbol_placement::STATIC,
-						 0, psymtab_language, objfile);
+			    add_psymbol_to_list
+			      (gdb::string_view (namestring,
+						 p - namestring),
+			       true, VAR_DOMAIN, LOC_TYPEDEF, -1,
+			       psymbol_placement::STATIC, 0, psymtab_language,
+			       objfile);
 			  }
 		      check_enum:
 			/* If this is an enumerated type, we need to add
@@ -3166,9 +3168,10 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 				/* Note that the value doesn't matter for
 				   enum constants in psymtabs, just in
 				   symtabs.  */
-				add_psymbol_to_list (p, q - p, true,
-						     VAR_DOMAIN, LOC_CONST,
-						     -1,
+				add_psymbol_to_list (gdb::string_view (p,
+								       q - p),
+						     true, VAR_DOMAIN,
+						     LOC_CONST, -1,
 						     psymbol_placement::STATIC,
 						     0, psymtab_language,
 						     objfile);
@@ -3185,8 +3188,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			continue;
 		      case 'c':
 			/* Constant, e.g. from "const" in Pascal.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_CONST, -1,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_CONST, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
 			continue;
@@ -3198,8 +3202,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    function_outside_compilation_unit_complaint
 			      (copy.c_str ());
 			  }
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_BLOCK,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_BLOCK,
 					     SECT_OFF_TEXT (objfile),
 					     psymbol_placement::STATIC,
 					     sh.value,
@@ -3217,8 +3222,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 			    function_outside_compilation_unit_complaint
 			      (copy.c_str ());
 			  }
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_BLOCK,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_BLOCK,
 					     SECT_OFF_TEXT (objfile),
 					     psymbol_placement::GLOBAL,
 					     sh.value,
@@ -3452,13 +3458,13 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		     symbol table, and the MAIN__ symbol via the minimal
 		     symbol table.  */
 		  if (sh.st == stProc)
-		    add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		    add_psymbol_to_list (sym_name, true,
 					 VAR_DOMAIN, LOC_BLOCK,
 					 section,
 					 psymbol_placement::GLOBAL,
 					 sh.value, psymtab_language, objfile);
 		  else
-		    add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		    add_psymbol_to_list (sym_name, true,
 					 VAR_DOMAIN, LOC_BLOCK,
 					 section,
 					 psymbol_placement::STATIC,
@@ -3525,7 +3531,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		      && sh.iss != 0
 		      && sh.index != cur_sdx + 2)
 		    {
-		      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+		      add_psymbol_to_list (sym_name, true,
 					   STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 					   psymbol_placement::STATIC,
 					   0, psymtab_language, objfile);
@@ -3565,7 +3571,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		  continue;
 		}
 	      /* Use this gdb symbol.  */
-	      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+	      add_psymbol_to_list (sym_name, true,
 				   VAR_DOMAIN, theclass, section,
 				   psymbol_placement::STATIC,
 				   sh.value, psymtab_language, objfile);
@@ -3644,7 +3650,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 		  break;
 		}
 	      char *sym_name = debug_info->ssext + psh->iss;
-	      add_psymbol_to_list (sym_name, strlen (sym_name), true,
+	      add_psymbol_to_list (sym_name, true,
 				   VAR_DOMAIN, theclass,
 				   section,
 				   psymbol_placement::GLOBAL,
@@ -3807,7 +3813,7 @@ handle_psymbol_enumerators (struct objfile *objfile, FDR *fh, int stype,
 
       /* Note that the value doesn't matter for enum constants
          in psymtabs, just in symtabs.  */
-      add_psymbol_to_list (name, strlen (name), true,
+      add_psymbol_to_list (name, true,
 			   VAR_DOMAIN, LOC_CONST, -1,
 			   psymbol_placement::STATIC, 0,
 			   psymtab_language, objfile);
@@ -4758,7 +4764,7 @@ new_symbol (const char *name)
 
   SYMBOL_SET_LANGUAGE (s, psymtab_language,
 		       &mdebugread_objfile->objfile_obstack);
-  SYMBOL_SET_NAMES (s, name, strlen (name), 1, mdebugread_objfile);
+  SYMBOL_SET_NAMES (s, name, true, mdebugread_objfile);
   return s;
 }
 
diff --git a/gdb/minsyms.c b/gdb/minsyms.c
index 83f5d89577..3855f74b3a 100644
--- a/gdb/minsyms.c
+++ b/gdb/minsyms.c
@@ -1063,7 +1063,7 @@ mst_str (minimal_symbol_type t)
 /* See minsyms.h.  */
 
 struct minimal_symbol *
-minimal_symbol_reader::record_full (const char *name, int name_len,
+minimal_symbol_reader::record_full (gdb::string_view name,
 				    bool copy_name, CORE_ADDR address,
 				    enum minimal_symbol_type ms_type,
 				    int section)
@@ -1077,24 +1077,22 @@ minimal_symbol_reader::record_full (const char *name, int name_len,
      lookup_minimal_symbol_by_pc would have no way of getting the
      right one.  */
   if (ms_type == mst_file_text && name[0] == 'g'
-      && (strcmp (name, GCC_COMPILED_FLAG_SYMBOL) == 0
-	  || strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0))
+      && (name == GCC_COMPILED_FLAG_SYMBOL
+	  || name == GCC2_COMPILED_FLAG_SYMBOL))
     return (NULL);
 
   /* It's safe to strip the leading char here once, since the name
      is also stored stripped in the minimal symbol table.  */
   if (name[0] == get_symbol_leading_char (m_objfile->obfd))
-    {
-      ++name;
-      --name_len;
-    }
+    name = name.substr (1);
 
   if (ms_type == mst_file_text && startswith (name, "__gnu_compiled"))
     return (NULL);
 
   if (symtab_create_debug >= 2)
-    printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %s\n",
-               mst_str (ms_type), hex_string (address), section, name);
+    printf_unfiltered ("Recording minsym:  %-21s  %18s  %4d  %.*s\n",
+               mst_str (ms_type), hex_string (address), section,
+	       (int) name.size (), name.data ());
 
   if (m_msym_bunch_index == BUNCH_SIZE)
     {
@@ -1106,7 +1104,7 @@ minimal_symbol_reader::record_full (const char *name, int name_len,
   msymbol = &m_msym_bunch->contents[m_msym_bunch_index];
   symbol_set_language (msymbol, language_auto,
 		       &m_objfile->per_bfd->storage_obstack);
-  symbol_set_names (msymbol, name, name_len, copy_name, m_objfile->per_bfd);
+  symbol_set_names (msymbol, name, copy_name, m_objfile->per_bfd);
 
   SET_MSYMBOL_VALUE_ADDRESS (msymbol, address);
   MSYMBOL_SECTION (msymbol) = section;
diff --git a/gdb/minsyms.h b/gdb/minsyms.h
index ce4b83d544..f62a2b9914 100644
--- a/gdb/minsyms.h
+++ b/gdb/minsyms.h
@@ -88,7 +88,6 @@ class minimal_symbol_reader
      Arguments are:
 
      NAME - the symbol's name
-     NAME_LEN - the length of the name
      COPY_NAME - if true, the minsym code must make a copy of NAME.  If
      false, then NAME must be NUL-terminated, and must have a lifetime
      that is at least as long as OBJFILE's lifetime.
@@ -97,15 +96,14 @@ class minimal_symbol_reader
      SECTION - the symbol's section
   */
 
-  struct minimal_symbol *record_full (const char *name,
-				      int name_len,
+  struct minimal_symbol *record_full (gdb::string_view name,
 				      bool copy_name,
 				      CORE_ADDR address,
 				      enum minimal_symbol_type ms_type,
 				      int section);
 
   /* Like record_full, but:
-     - uses strlen to compute NAME_LEN,
+     - computes the length of NAME
      - passes COPY_NAME = true,
      - and passes a default SECTION, depending on the type
 
@@ -115,7 +113,7 @@ class minimal_symbol_reader
 	       enum minimal_symbol_type ms_type);
 
   /* Like record_full, but:
-     - uses strlen to compute NAME_LEN,
+     - computes the length of NAME
      - passes COPY_NAME = true.
 
      This variant does not return the new symbol.  */
@@ -124,7 +122,7 @@ class minimal_symbol_reader
 			 enum minimal_symbol_type ms_type,
 			 int section)
   {
-    record_full (name, strlen (name), true, address, ms_type, section);
+    record_full (name, true, address, ms_type, section);
   }
 
  private:
diff --git a/gdb/psympriv.h b/gdb/psympriv.h
index 3e89742d8d..9404c46837 100644
--- a/gdb/psympriv.h
+++ b/gdb/psympriv.h
@@ -22,6 +22,7 @@
 
 #include "psymtab.h"
 #include "objfiles.h"
+#include "gdbsupport/gdb_string_view.h"
 
 /* A partial_symbol records the name, domain, and address class of
    symbols whose types we have not parsed yet.  For functions, it also
@@ -304,14 +305,13 @@ enum class psymbol_placement
    LANGUAGE is the language from which the symbol originates.  This will
    influence, amongst other things, how the symbol name is demangled. */
 
-extern void add_psymbol_to_list (const char *name, int namelength,
-				 bool copy_name, domain_enum domain,
-				 enum address_class theclass,
-				 short section,
-				 psymbol_placement where,
-				 CORE_ADDR coreaddr,
-				 enum language language,
-				 struct objfile *objfile);
+extern void add_psymbol_to_list (gdb::string_view,
+				 bool, domain_enum,
+				 enum address_class,
+				 short /* section */,
+				 enum psymbol_placement,
+				 CORE_ADDR,
+				 enum language, struct objfile *);
 
 /* Initialize storage for partial symbols.  If partial symbol storage
    has already been initialized, this does nothing.  TOTAL_SYMBOLS is
diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index 31b6d59777..b30d29e6ef 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -1568,7 +1568,7 @@ psymbol_compare (const void *addr1, const void *addr2, int length)
    different domain (or address) is possible and correct.  */
 
 static struct partial_symbol *
-add_psymbol_to_bcache (const char *name, int namelength, bool copy_name,
+add_psymbol_to_bcache (gdb::string_view name, bool copy_name,
 		       domain_enum domain,
 		       enum address_class theclass,
 		       short section,
@@ -1585,7 +1585,7 @@ add_psymbol_to_bcache (const char *name, int namelength, bool copy_name,
   psymbol.aclass = theclass;
   symbol_set_language (&psymbol.ginfo, language,
 		       objfile->partial_symtabs->obstack ());
-  symbol_set_names (&psymbol.ginfo, name, namelength, copy_name,
+  symbol_set_names (&psymbol.ginfo, name, copy_name,
 		    objfile->per_bfd);
 
   /* Stash the partial symbol away in the cache.  */
@@ -1608,7 +1608,7 @@ append_psymbol_to_list (std::vector<partial_symbol *> *list,
 /* See psympriv.h.  */
 
 void
-add_psymbol_to_list (const char *name, int namelength, bool copy_name,
+add_psymbol_to_list (gdb::string_view name, bool copy_name,
 		     domain_enum domain,
 		     enum address_class theclass,
 		     short section,
@@ -1621,7 +1621,7 @@ add_psymbol_to_list (const char *name, int namelength, bool copy_name,
   int added;
 
   /* Stash the partial symbol away in the cache.  */
-  psym = add_psymbol_to_bcache (name, namelength, copy_name, domain, theclass,
+  psym = add_psymbol_to_bcache (name, copy_name, domain, theclass,
 				section, coreaddr, language, objfile, &added);
 
   /* Do not duplicate global partial symbols.  */
diff --git a/gdb/stabsread.c b/gdb/stabsread.c
index 48c88ded55..d8cb4a5264 100644
--- a/gdb/stabsread.c
+++ b/gdb/stabsread.c
@@ -751,11 +751,12 @@ define_symbol (CORE_ADDR valu, const char *string, int desc, int type,
       if (!new_name.empty ())
 	{
 	  SYMBOL_SET_NAMES (sym,
-			    new_name.c_str (), new_name.length (),
+			    new_name,
 			    1, objfile);
 	}
       else
-	SYMBOL_SET_NAMES (sym, string, p - string, 1, objfile);
+	SYMBOL_SET_NAMES (sym, gdb::string_view (string, p - string), true,
+			  objfile);
 
       if (SYMBOL_LANGUAGE (sym) == language_cplus)
 	cp_scan_for_anonymous_namespaces (get_buildsym_compunit (), sym,
diff --git a/gdb/symtab.c b/gdb/symtab.c
index 6ea9fc6971..25f714a0f4 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -811,7 +811,7 @@ symbol_find_demangled_name (struct general_symbol_info *gsymbol,
 
 void
 symbol_set_names (struct general_symbol_info *gsymbol,
-		  const char *linkage_name, int len, bool copy_name,
+		  gdb::string_view linkage_name, bool copy_name,
 		  struct objfile_per_bfd_storage *per_bfd)
 {
   struct demangled_name_entry **slot;
@@ -824,14 +824,14 @@ symbol_set_names (struct general_symbol_info *gsymbol,
       /* In Ada, we do the symbol lookups using the mangled name, so
          we can save some space by not storing the demangled name.  */
       if (!copy_name)
-	gsymbol->name = linkage_name;
+	gsymbol->name = linkage_name.data ();
       else
 	{
 	  char *name = (char *) obstack_alloc (&per_bfd->storage_obstack,
-					       len + 1);
+					       linkage_name.length () + 1);
 
-	  memcpy (name, linkage_name, len);
-	  name[len] = '\0';
+	  memcpy (name, linkage_name.data (), linkage_name.length ());
+	  name[linkage_name.length ()] = '\0';
 	  gsymbol->name = name;
 	}
       symbol_set_demangled_name (gsymbol, NULL, &per_bfd->storage_obstack);
@@ -842,18 +842,20 @@ symbol_set_names (struct general_symbol_info *gsymbol,
   if (per_bfd->demangled_names_hash == NULL)
     create_demangled_names_hash (per_bfd);
 
-  if (linkage_name[len] != '\0')
+  /* Don't use string_view::operator[] because we are accessing beyond
+     the size of the string_view, which is technically unsupported.  */
+  if (linkage_name.data ()[linkage_name.length ()] != '\0')
     {
       char *alloc_name;
 
-      alloc_name = (char *) alloca (len + 1);
-      memcpy (alloc_name, linkage_name, len);
-      alloc_name[len] = '\0';
+      alloc_name = (char *) alloca (linkage_name.length () + 1);
+      memcpy (alloc_name, linkage_name.data (), linkage_name.length ());
+      alloc_name[linkage_name.length ()] = '\0';
 
       linkage_name_copy = alloc_name;
     }
   else
-    linkage_name_copy = linkage_name;
+    linkage_name_copy = linkage_name.data ();
 
   entry.mangled = linkage_name_copy;
   slot = ((struct demangled_name_entry **)
@@ -881,14 +883,14 @@ symbol_set_names (struct general_symbol_info *gsymbol,
 	 It turns out that it is actually important to still save such
 	 an entry in the hash table, because storing this name gives
 	 us better bcache hit rates for partial symbols.  */
-      if (!copy_name && linkage_name_copy == linkage_name)
+      if (!copy_name && linkage_name_copy == linkage_name.data ())
 	{
 	  *slot
 	    = ((struct demangled_name_entry *)
 	       obstack_alloc (&per_bfd->storage_obstack,
 			      offsetof (struct demangled_name_entry, demangled)
 			      + demangled_len + 1));
-	  (*slot)->mangled = linkage_name;
+	  (*slot)->mangled = linkage_name.data ();
 	}
       else
 	{
@@ -901,7 +903,7 @@ symbol_set_names (struct general_symbol_info *gsymbol,
 	    = ((struct demangled_name_entry *)
 	       obstack_alloc (&per_bfd->storage_obstack,
 			      offsetof (struct demangled_name_entry, demangled)
-			      + len + demangled_len + 2));
+			      + linkage_name.length () + demangled_len + 2));
 	  mangled_ptr = &((*slot)->demangled[demangled_len + 1]);
 	  strcpy (mangled_ptr, linkage_name_copy);
 	  (*slot)->mangled = mangled_ptr;
diff --git a/gdb/symtab.h b/gdb/symtab.h
index 1f0fc62a65..1546d83029 100644
--- a/gdb/symtab.h
+++ b/gdb/symtab.h
@@ -29,6 +29,7 @@
 #include "gdbsupport/enum-flags.h"
 #include "gdbsupport/function-view.h"
 #include "gdbsupport/gdb_optional.h"
+#include "gdbsupport/gdb_string_view.h"
 #include "gdbsupport/next-iterator.h"
 #include "completer.h"
 
@@ -493,11 +494,11 @@ extern void symbol_set_language (struct general_symbol_info *symbol,
 
 /* Set the linkage and natural names of a symbol, by demangling
    the linkage name.  */
-#define SYMBOL_SET_NAMES(symbol,linkage_name,len,copy_name,objfile)	\
-  symbol_set_names (&(symbol)->ginfo, linkage_name, len, copy_name, \
+#define SYMBOL_SET_NAMES(symbol,linkage_name,copy_name,objfile)	\
+  symbol_set_names (&(symbol)->ginfo, linkage_name, copy_name, \
 		    (objfile)->per_bfd)
 extern void symbol_set_names (struct general_symbol_info *symbol,
-			      const char *linkage_name, int len, bool copy_name,
+			      gdb::string_view linkage_name, bool copy_name,
 			      struct objfile_per_bfd_storage *per_bfd);
 
 /* Now come lots of name accessor macros.  Short version as to when to
diff --git a/gdb/xcoffread.c b/gdb/xcoffread.c
index 2fa2706653..52a700215d 100644
--- a/gdb/xcoffread.c
+++ b/gdb/xcoffread.c
@@ -2644,8 +2644,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		  namestring = gdbarch_static_transform_name
 				 (gdbarch, namestring);
 
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_STATIC,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_STATIC,
 				     SECT_OFF_DATA (objfile),
 				     psymbol_placement::STATIC,
 				     symbol.n_value,
@@ -2655,8 +2656,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 	      case 'G':
 		/* The addresses in these entries are reported to be
 		   wrong.  See the code that reads 'G's for symtabs.  */
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_STATIC,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_STATIC,
 				     SECT_OFF_DATA (objfile),
 				     psymbol_placement::GLOBAL,
 				     symbol.n_value,
@@ -2674,15 +2676,17 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		    || (p == namestring + 1
 			&& namestring[0] != ' '))
 		  {
-		    add_psymbol_to_list (namestring, p - namestring, true,
-					 STRUCT_DOMAIN, LOC_TYPEDEF, -1,
+		    add_psymbol_to_list (gdb::string_view (namestring,
+							   p - namestring),
+					 true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
 					 psymbol_placement::STATIC,
 					 0, psymtab_language, objfile);
 		    if (p[2] == 't')
 		      {
 			/* Also a typedef with the same name.  */
-			add_psymbol_to_list (namestring, p - namestring, true,
-					     VAR_DOMAIN, LOC_TYPEDEF, -1,
+			add_psymbol_to_list (gdb::string_view (namestring,
+							       p - namestring),
+					     true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
 			p += 1;
@@ -2693,8 +2697,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 	      case 't':
 		if (p != namestring)	/* a name is there, not just :T...  */
 		  {
-		    add_psymbol_to_list (namestring, p - namestring, true,
-					 VAR_DOMAIN, LOC_TYPEDEF, -1,
+		    add_psymbol_to_list (gdb::string_view (namestring,
+							   p - namestring),
+					 true, VAR_DOMAIN, LOC_TYPEDEF, -1,
 					 psymbol_placement::STATIC,
 					 0, psymtab_language, objfile);
 		  }
@@ -2755,7 +2760,7 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 			  ;
 			/* Note that the value doesn't matter for
 			   enum constants in psymtabs, just in symtabs.  */
-			add_psymbol_to_list (p, q - p, true,
+			add_psymbol_to_list (gdb::string_view (p, q - p), true,
 					     VAR_DOMAIN, LOC_CONST, -1,
 					     psymbol_placement::STATIC,
 					     0, psymtab_language, objfile);
@@ -2773,8 +2778,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 
 	      case 'c':
 		/* Constant, e.g. from "const" in Pascal.  */
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_CONST, -1,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_CONST, -1,
 				     psymbol_placement::STATIC,
 				     0, psymtab_language, objfile);
 		continue;
@@ -2790,8 +2796,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		    function_outside_compilation_unit_complaint (name);
 		    xfree (name);
 		  }
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_BLOCK,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_BLOCK,
 				     SECT_OFF_TEXT (objfile),
 				     psymbol_placement::STATIC,
 				     symbol.n_value,
@@ -2820,8 +2827,9 @@ scan_xcoff_symtab (minimal_symbol_reader &reader,
 		if (startswith (namestring, "@FIX"))
 		  continue;
 
-		add_psymbol_to_list (namestring, p - namestring, true,
-				     VAR_DOMAIN, LOC_BLOCK,
+		add_psymbol_to_list (gdb::string_view (namestring,
+						       p - namestring),
+				     true, VAR_DOMAIN, LOC_BLOCK,
 				     SECT_OFF_TEXT (objfile),
 				     psymbol_placement::GLOBAL,
 				     symbol.n_value,
-- 
2.23.0.444.g18eeb5a265-goog

Re: [PATCH] Change some arguments to gdb::string_view instead of name+len

[Pedro Alves]

On 10/1/19 7:27 PM, Christian Biesinger via gdb-patches wrote:
> On Tue, Oct 1, 2019 at 1:23 PM Pedro Alves <palves@redhat.com> wrote:
>>
>> On 10/1/19 6:33 PM, Christian Biesinger via gdb-patches wrote:
>>> -  if (linkage_name[len] != '\0')
>>> +  /* Don't use string_view::operator[] because we are accessing beyond
>>> +     the size of the string_view, which is technically unsupported.  */
>>> +  if (linkage_name.data ()[linkage_name.length ()] != '\0')
>>>      {
>>>        char *alloc_name;
>>
>> It's more than just unsupported, it's undefined behavior.  If we're promising
>> the string_view interface, then it's supposedly valid to pass in a string_view
>> that happens to point just at the end of a page, with the one-past-the-end
>> byte living in an unmapped page.  Dereferencing the one-past-end byte in
>> that case SIGSEGVs.
> 
> That's true (though also a pre-existing issue).
> 
>>> -  if (ms_type == mst_file_text && startswith (name, "__gnu_compiled"))
>>> +  if (ms_type == mst_file_text && startswith (name.data (), "__gnu_compiled"))
>>>      return (NULL);
>>>
>>
>> This, via startswith also assumes that name.data() is a null-terminated
>> string.
> 
> Ah yes. I'll add a startswith version that takes string_views.
> 
>> I wonder whether we should have a zstring_view type.  like string_view, but
>> assumes/requires null-terminated.
> 
> How does that solve anything? This function can (apparently) take
> non-null terminated strings, so zstring_view wouldn't work?

Ah, right.  

Hmm.

I wonder then, I assume that the caller up the stack should know whether
the string was originally null terminated?  I wonder about tweaking the
interface to pass that info down somehow.

Are those cases the ones where you call strlen at the caller?

Like, the interface could be:

 /* ... If LEN is -1, then LINKAGE_NAME is a null-terminated string.
 Otherwise, LINKAGE_NAME is a pointer to a string of LEN length,
 and not null-terminated.  ... */

 void
 symbol_set_names (struct general_symbol_info *gsymbol,
 		  const char *linkage_name, int len, int copy_name,
 		  struct objfile_per_bfd_storage *per_bfd)
 {

So effectively, you'd be pushing the strlen call down to
symbol_set_names.

This goes against the idea of using string_view here, though...

Thanks,
Pedro Alves

Re: [PATCH] Change some arguments to gdb::string_view instead of name+len

[Christian Biesinger via gdb-patches]

On Tue, Oct 1, 2019 at 2:10 PM Pedro Alves <palves@redhat.com> wrote:
>
> On 10/1/19 7:27 PM, Christian Biesinger via gdb-patches wrote:
> > On Tue, Oct 1, 2019 at 1:23 PM Pedro Alves <palves@redhat.com> wrote:
> >>
> >> On 10/1/19 6:33 PM, Christian Biesinger via gdb-patches wrote:
> >>> -  if (linkage_name[len] != '\0')
> >>> +  /* Don't use string_view::operator[] because we are accessing beyond
> >>> +     the size of the string_view, which is technically unsupported.  */
> >>> +  if (linkage_name.data ()[linkage_name.length ()] != '\0')
> >>>      {
> >>>        char *alloc_name;
> >>
> >> It's more than just unsupported, it's undefined behavior.  If we're promising
> >> the string_view interface, then it's supposedly valid to pass in a string_view
> >> that happens to point just at the end of a page, with the one-past-the-end
> >> byte living in an unmapped page.  Dereferencing the one-past-end byte in
> >> that case SIGSEGVs.
> >
> > That's true (though also a pre-existing issue).
> >
> >>> -  if (ms_type == mst_file_text && startswith (name, "__gnu_compiled"))
> >>> +  if (ms_type == mst_file_text && startswith (name.data (), "__gnu_compiled"))
> >>>      return (NULL);
> >>>
> >>
> >> This, via startswith also assumes that name.data() is a null-terminated
> >> string.
> >
> > Ah yes. I'll add a startswith version that takes string_views.
> >
> >> I wonder whether we should have a zstring_view type.  like string_view, but
> >> assumes/requires null-terminated.
> >
> > How does that solve anything? This function can (apparently) take
> > non-null terminated strings, so zstring_view wouldn't work?
>
> Ah, right.
>
> Hmm.
>
> I wonder then, I assume that the caller up the stack should know whether
> the string was originally null terminated?  I wonder about tweaking the
> interface to pass that info down somehow.

Actually, let me come at this from a different direction...

I looked at all the callers. In every case, they either passed a
nullterminated string or a substring of an existing string. In other
words, accessing name[length] was always valid, even if the
string_view wasn't nullterminated.

In light of that, how do you feel about just documenting that callers
have to pass a string view where accessing [length] is guaranteed not
to be an invalid memory access?

Thanks,
Christian

Re: [PATCH] Change some arguments to gdb::string_view instead of name+len

[Pedro Alves]

On 10/1/19 8:29 PM, Christian Biesinger wrote:
> On Tue, Oct 1, 2019 at 2:10 PM Pedro Alves <palves@redhat.com> wrote:

>> I wonder then, I assume that the caller up the stack should know whether
>> the string was originally null terminated?  I wonder about tweaking the
>> interface to pass that info down somehow.
> 
> Actually, let me come at this from a different direction...
> 
> I looked at all the callers. In every case, they either passed a
> nullterminated string or a substring of an existing string. In other
> words, accessing name[length] was always valid, even if the
> string_view wasn't nullterminated.
> 
> In light of that, how do you feel about just documenting that callers
> have to pass a string view where accessing [length] is guaranteed not
> to be an invalid memory access?

My feeling is that one of the points of vocabulary types like string_view is
that you replace documentation with rules or contracts enforced by, or
encoded in the types.  To me, it feels like a bit of a hack or design issue that
we switch to string_view while at the same time, find that we need to step
outside its contract.  A char * pointer is low level and as such forces
you into a "what exactly am I allowed to pass here?" mind state, while
a string_view has a contract that people should just be able to
assume.

OTOH, I don't feel that strongly about this case, there are
certainly bigger fish to fry!

So I guess I'll be happy with just documenting.  But
please don't take that as approval.  I'd rather defer to Tromey,
since he had started the review, and I haven't even looked at the
whole patch in detail.

Thanks,
Pedro Alves

Re: [PATCH] Change some arguments to gdb::string_view instead of name+len

[Christian Biesinger via gdb-patches]

On Wed, Oct 2, 2019 at 9:45 AM Pedro Alves <palves@redhat.com> wrote:
>
> On 10/1/19 8:29 PM, Christian Biesinger wrote:
> > On Tue, Oct 1, 2019 at 2:10 PM Pedro Alves <palves@redhat.com> wrote:
>
> >> I wonder then, I assume that the caller up the stack should know whether
> >> the string was originally null terminated?  I wonder about tweaking the
> >> interface to pass that info down somehow.
> >
> > Actually, let me come at this from a different direction...
> >
> > I looked at all the callers. In every case, they either passed a
> > nullterminated string or a substring of an existing string. In other
> > words, accessing name[length] was always valid, even if the
> > string_view wasn't nullterminated.
> >
> > In light of that, how do you feel about just documenting that callers
> > have to pass a string view where accessing [length] is guaranteed not
> > to be an invalid memory access?
>
> My feeling is that one of the points of vocabulary types like string_view is
> that you replace documentation with rules or contracts enforced by, or
> encoded in the types.  To me, it feels like a bit of a hack or design issue that
> we switch to string_view while at the same time, find that we need to step
> outside its contract.  A char * pointer is low level and as such forces
> you into a "what exactly am I allowed to pass here?" mind state, while
> a string_view has a contract that people should just be able to
> assume.
>
> OTOH, I don't feel that strongly about this case, there are
> certainly bigger fish to fry!
>
> So I guess I'll be happy with just documenting.  But
> please don't take that as approval.  I'd rather defer to Tromey,
> since he had started the review, and I haven't even looked at the
> whole patch in detail.

tromey -- any thoughts on this? As I see it, the two options are:
- Always alloca+strcpy (ought to be fairly cheap)
- Document that accessing .data()[length] must be valid

(or make bfd_demangle take a length, but that doesn't seem realistic)


Christian