Re: [rfc] Be in language c more c++ compatible

[Jan Kratochvil <jan.kratochvil@redhat.com>]

On Sat, 23 Jul 2011 23:17:43 +0200, Matt Rice wrote:
> was curious what it did with the attached objc++ version.
> 
> which isn't really a supported language by any means.
> gdb considers it to be 'minimal'/doesn't recognize the CU language in
> the debuginfo.

dwarf2read.c:set_cu_language does not recognize DW_LANG_ObjC_plus_plus.


> gcc -g -o objcxx objc++.mm -lobjc
[...]
> (gdb) set language c++
> (gdb) whatis C::t
> A syntax error in expression, near `'.

the problem is the CU (Compilation Unit) is neither Java nor C++ and it even
has no DW_AT_MIPS_linkage_name, therefore `C::C' constructor gets symbol name
`C' which just cannot work.

There probably needs to be created new language_objcplus and adjust the code
accordingly.

I think this is outside of the scope of this thread.


Thanks,
Jan


--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -5019,7 +5019,7 @@ dwarf2_compute_name (char *name, struct die_info *die, struct dwarf2_cu *cu,
   /* These are the only languages we know how to qualify names in.  */
   if (name != NULL
       && (cu->language == language_cplus || cu->language == language_java
-	  || cu->language == language_fortran))
+	  || cu->language == language_fortran || cu->language == language_objc))
     {
       if (die_needs_namespace (die, cu))
 	{
@@ -5061,7 +5061,8 @@ dwarf2_compute_name (char *name, struct die_info *die, struct dwarf2_cu *cu,
 	     templates; two instantiated function templates are allowed to
 	     differ only by their return types, which we do not add here.  */
 
-	  if (cu->language == language_cplus && strchr (name, '<') == NULL)
+	  if ((cu->language == language_cplus || cu->language == language_objc)
+	      && strchr (name, '<') == NULL)
 	    {
 	      struct attribute *attr;
 	      struct die_info *child;
@@ -5171,7 +5172,8 @@ dwarf2_compute_name (char *name, struct die_info *die, struct dwarf2_cu *cu,
 
 	  if (physname && die->tag == DW_TAG_subprogram
 	      && (cu->language == language_cplus
-		  || cu->language == language_java))
+		  || cu->language == language_java
+		  || cu->language == language_objc))
 	    {
 	      struct type *type = read_type_die (die, cu);
 
@@ -5205,7 +5207,7 @@ dwarf2_compute_name (char *name, struct die_info *die, struct dwarf2_cu *cu,
 				       &length);
 	  ui_file_delete (buf);
 
-	  if (cu->language == language_cplus)
+	  if (cu->language == language_cplus || cu->language == language_objc)
 	    {
 	      char *cname
 		= dwarf2_canonicalize_name (name, cu,
@@ -10399,6 +10401,7 @@ set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
       cu->language = language_pascal;
       break;
     case DW_LANG_ObjC:
+    case DW_LANG_ObjC_plus_plus:
       cu->language = language_objc;
       break;
     case DW_LANG_Cobol74: