[committed]: [PATCH] Don't check PST is NULL in read_symtab

[Yao Qi <yao@codesourcery.com>]

On 01/11/2013 11:06 PM, Tom Tromey wrote:
> Sure.  Though I am ok with just a comment as well.

Below is what I committed, with the comments added.

-- 
Yao (齐尧)

gdb:
    
2013-01-14  Yao Qi  <yao@codesourcery.com>
    
	* dbxread.c (dbx_psymtab_to_symtab_1): Don't check PST is NULL.
	(dbx_psymtab_to_symtab): Likewise.
	* dwarf2read.c (dwarf2_psymtab_to_symtab): Likewise.
	* mdebugread.c (mdebug_psymtab_to_symtab): Likewise.
	* xcoffread.c (xcoff_psymtab_to_symtab_1): Likewise.

diff --git a/gdb/dbxread.c b/gdb/dbxread.c
index ebe4237..16496d1 100644
--- a/gdb/dbxread.c
+++ b/gdb/dbxread.c
@@ -2406,9 +2406,6 @@ dbx_psymtab_to_symtab_1 (struct objfile *objfile, struct partial_symtab *pst)
   struct cleanup *old_chain;
   int i;
 
-  if (!pst)
-    return;
-
   if (pst->readin)
     {
       fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in.  "
@@ -2455,7 +2452,7 @@ dbx_psymtab_to_symtab_1 (struct objfile *objfile, struct partial_symtab *pst)
 }
 
 /* Read in all of the symbols for a given psymtab for real.
-   Be verbose about it if the user wants that.  */
+   Be verbose about it if the user wants that.  PST is not NULL.  */
 
 static void
 dbx_psymtab_to_symtab (struct objfile *objfile, struct partial_symtab *pst)
@@ -2463,9 +2460,6 @@ dbx_psymtab_to_symtab (struct objfile *objfile, struct partial_symtab *pst)
   bfd *sym_bfd;
   struct cleanup *back_to = NULL;
 
-  if (!pst)
-    return;
-
   if (pst->readin)
     {
       fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in.  "
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index e2088f1..7af89c6 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -6405,52 +6405,50 @@ locate_pdi_sibling (const struct die_reader_specs *reader,
   return skip_children (reader, info_ptr);
 }
 
-/* Expand this partial symbol table into a full symbol table.  */
+/* Expand this partial symbol table into a full symbol table.  PST is
+   not NULL.  */
 
 static void
 dwarf2_psymtab_to_symtab (struct objfile *objfile, struct partial_symtab *pst)
 {
-  if (pst != NULL)
+  if (pst->readin)
     {
-      if (pst->readin)
+      warning (_("bug: psymtab for %s is already read in."),
+	       pst->filename);
+    }
+  else
+    {
+      if (info_verbose)
 	{
-	  warning (_("bug: psymtab for %s is already read in."),
-		   pst->filename);
+	  printf_filtered (_("Reading in symbols for %s..."),
+			   pst->filename);
+	  gdb_flush (gdb_stdout);
 	}
-      else
-	{
-	  if (info_verbose)
-	    {
-	      printf_filtered (_("Reading in symbols for %s..."),
-			       pst->filename);
-	      gdb_flush (gdb_stdout);
-	    }
 
-	  /* Restore our global data.  */
-	  dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
+      /* Restore our global data.  */
+      dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
 
-	  /* If this psymtab is constructed from a debug-only objfile, the
-	     has_section_at_zero flag will not necessarily be correct.  We
-	     can get the correct value for this flag by looking at the data
-	     associated with the (presumably stripped) associated objfile.  */
-	  if (objfile->separate_debug_objfile_backlink)
-	    {
-	      struct dwarf2_per_objfile *dpo_backlink
-	        = objfile_data (objfile->separate_debug_objfile_backlink,
-		                dwarf2_objfile_data_key);
+      /* If this psymtab is constructed from a debug-only objfile, the
+	 has_section_at_zero flag will not necessarily be correct.  We
+	 can get the correct value for this flag by looking at the data
+	 associated with the (presumably stripped) associated objfile.  */
+      if (objfile->separate_debug_objfile_backlink)
+	{
+	  struct dwarf2_per_objfile *dpo_backlink
+	    = objfile_data (objfile->separate_debug_objfile_backlink,
+			    dwarf2_objfile_data_key);
 
-	      dwarf2_per_objfile->has_section_at_zero
-		= dpo_backlink->has_section_at_zero;
-	    }
+	  dwarf2_per_objfile->has_section_at_zero
+	    = dpo_backlink->has_section_at_zero;
+	}
 
-	  dwarf2_per_objfile->reading_partial_symbols = 0;
+      dwarf2_per_objfile->reading_partial_symbols = 0;
 
-	  psymtab_to_symtab_1 (pst);
+      psymtab_to_symtab_1 (pst);
 
-	  /* Finish up the debug error message.  */
-	  if (info_verbose)
-	    printf_filtered (_("done.\n"));
-	}
+      /* Finish up the debug error message.  */
+      if (info_verbose)
+	printf_filtered (_("done.\n"));
     }
 
   process_cu_includes ();
diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index 856ca9d..2eb0536 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -273,14 +273,11 @@ static char *mdebug_next_symbol_text (struct objfile *);
 /* Exported procedure: Builds a symtab from the PST partial one.
    Restores the environment in effect when PST was created, delegates
    most of the work to an ancillary procedure, and sorts
-   and reorders the symtab list at the end.  */
+   and reorders the symtab list at the end.  PST is not NULL.  */
 
 static void
 mdebug_psymtab_to_symtab (struct objfile *objfile, struct partial_symtab *pst)
 {
-  if (!pst)
-    return;
-
   if (info_verbose)
     {
       printf_filtered (_("Reading in symbols for %s..."), pst->filename);
diff --git a/gdb/xcoffread.c b/gdb/xcoffread.c
index 9fe8621..41aaf02 100644
--- a/gdb/xcoffread.c
+++ b/gdb/xcoffread.c
@@ -1855,14 +1855,11 @@ xcoff_psymtab_to_symtab_1 (struct objfile *objfile, struct partial_symtab *pst)
 }
 
 /* Read in all of the symbols for a given psymtab for real.
-   Be verbose about it if the user wants that.  */
+   Be verbose about it if the user wants that.  PST is not NULL.  */
 
 static void
 xcoff_psymtab_to_symtab (struct objfile *objfile, struct partial_symtab *pst)
 {
-  if (!pst)
-    return;
-
   if (pst->readin)
     {
       fprintf_unfiltered