rddbg.c stabs FIXMEs

This should sort out some very old FIXMEs in code handling stabs
debug info.  Necessary if we are to fuss over freeing up memory before
objdump and objcopy exit.  It is of course better from a user
viewpoint to *not* free memory, which takes some time, and leave that
to process exit.  The only reason to do so is that having many memory
leaks in binutils/ code tends to hide leaks in bfd/ or opcodes/, which
we should care about.

	* budbg.h (parse_stab): Update prototype.
	* debug.h (debug_start_source): Update prototype.
	* debug.c (debug_start_source): Add name_used.  Set if stashed.
	* rddbg.c (read_symbol_stabs_debugging_info): Always malloc
	stab string passed to parse_stab.  Free stab string when
	unreferenced.
	(read_section_stabs_debugging_info): Likewise, and strings
	section contents.
	* stabs.c (parse_stab): Add string_used param.  Set if string
	stashed.  Pass to debug_start_source.  Realloc file_types
	array rather that using malloc.  Clarify comment about
	debug_make_indirect_type.

binutils/budbg.h

@@ -39,7 +39,7 @@ extern void *start_stab (void *, bfd *, bool, asymbol **, long);
 extern bool finish_stab (void *, void *);
 
 extern bool parse_stab
-  (void *, void *, int, int, bfd_vma, const char *);
+  (void *, void *, int, int, bfd_vma, const char *, bool *);
 
 extern bool write_stabs_in_sections_debugging_info
   (bfd *, void *, bfd_byte **, bfd_size_type *, bfd_byte **, bfd_size_type *);

binutils/debug.c

@@ -713,7 +713,7 @@ debug_set_filename (void *handle, const char *name)
    include files in a single compilation unit.  */
 
 bool
-debug_start_source (void *handle, const char *name)
+debug_start_source (void *handle, const char *name, bool *name_used)
 {
   struct debug_handle *info = (struct debug_handle *) handle;
   struct debug_file *f, **pf;
@@ -740,6 +740,7 @@ debug_start_source (void *handle, const char *name)
   memset (f, 0, sizeof *f);
 
   f->filename = name;
+  *name_used = true;
 
   for (pf = &info->current_file->next;
        *pf != NULL;

binutils/debug.h

@@ -435,7 +435,7 @@ extern bool debug_set_filename (void *, const char *);
 /* Change source files to the given file name.  This is used for
    include files in a single compilation unit.  */
 
-extern bool debug_start_source (void *, const char *);
+extern bool debug_start_source (void *, const char *, bool *);
 
 /* Record a function definition.  This implicitly starts a function
    block.  The debug_type argument is the type of the return value.

binutils/rddbg.c

@@ -194,6 +194,7 @@ read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
 		{
 		  size_t len;
 		  char *f, *s;
+		  bool f_used;
 
 		  if (stroff + strx >= strsize)
 		    {
@@ -238,10 +239,13 @@ read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
 		      free (f);
 		      f = s;
 		    }
+		  if (!f)
+		    f = xstrdup (s);
 
 		  save_stab (type, desc, value, s);
 
-		  if (! parse_stab (dhandle, shandle, type, desc, value, s))
+		  if (! parse_stab (dhandle, shandle, type, desc, value,
+				    f, &f_used))
 		    {
 		      stab_context ();
 		      free_saved_stabs ();
@@ -252,18 +256,14 @@ read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
 		      return false;
 		    }
 
-		  /* Don't free f, since I think the stabs code
-		     expects strings to hang around.  This should be
-		     straightened out.  FIXME.  */
+		  if (!f_used)
+		    free (f);
 		}
 	    }
 
 	  free_saved_stabs ();
 	  free (stabs);
-
-	  /* Don't free strings, since I think the stabs code expects
-	     the strings to hang around.  This should be straightened
-	     out.  FIXME.  */
+	  free (strings);
 	}
     }
 
@@ -297,6 +297,7 @@ read_symbol_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
 	{
 	  const char *s;
 	  char *f;
+	  bool f_used;
 
 	  if (shandle == NULL)
 	    {
@@ -327,20 +328,22 @@ read_symbol_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
 	      f = n;
 	      s = n;
 	    }
+	  if (!f)
+	    f = xstrdup (s);
 
 	  save_stab (i.stab_type, i.stab_desc, i.value, s);
 
 	  if (! parse_stab (dhandle, shandle, i.stab_type, i.stab_desc,
-			    i.value, s))
+			    i.value, f, &f_used))
 	    {
 	      stab_context ();
+	      free (f);
 	      free_saved_stabs ();
 	      return false;
 	    }
 
-	  /* Don't free f, since I think the stabs code expects
-	     strings to hang around.  This should be straightened out.
-	     FIXME.  */
+	  if (!f_used)
+	    free (f);
 	}
     }
 

binutils/stabs.c

@@ -422,11 +422,12 @@ finish_stab (void *dhandle, void *handle)
 
 bool
 parse_stab (void *dhandle, void *handle, int type, int desc, bfd_vma value,
-	    const char *string)
+	    const char *string, bool *string_used)
 {
   const char * string_end;
   struct stab_handle *info = (struct stab_handle *) handle;
 
+  *string_used = false;
   /* gcc will emit two N_SO strings per compilation unit, one for the
      directory name and one for the file name.  We just collect N_SO
      strings as we see them, and start the new compilation unit when
@@ -447,11 +448,11 @@ parse_stab (void *dhandle, void *handle, int type, int desc, bfd_vma value,
 	info->file_start_offset = info->so_value;
 
       /* We need to reset the mapping from type numbers to types.  We
-	 can't free the old mapping, because of the use of
-	 debug_make_indirect_type.  */
+	 can only free the file_types array, not the stab_types
+	 list entries due to the use of debug_make_indirect_type.  */
       info->files = 1;
       info->file_types = ((struct stab_types **)
-			  xmalloc (sizeof *info->file_types));
+			  xrealloc (info->file_types, sizeof *info->file_types));
       info->file_types[0] = NULL;
       info->so_string = NULL;
 
@@ -566,21 +567,29 @@ parse_stab (void *dhandle, void *handle, int type, int desc, bfd_vma value,
 
     case N_SOL:
       /* Start an include file.  */
-      if (! debug_start_source (dhandle, string))
+      if (! debug_start_source (dhandle, string, string_used))
 	return false;
       break;
 
     case N_BINCL:
       /* Start an include file which may be replaced.  */
+      *string_used = true;
       push_bincl (info, string, value);
-      if (! debug_start_source (dhandle, string))
+      if (! debug_start_source (dhandle, string, string_used))
 	return false;
       break;
 
     case N_EINCL:
       /* End an N_BINCL include.  */
-      if (! debug_start_source (dhandle, pop_bincl (info)))
-	return false;
+      string = pop_bincl (info);
+      if (! debug_start_source (dhandle, string, string_used))
+	{
+	  free ((char *) string);
+	  return false;
+	}
+      if (!*string_used)
+	free ((char *) string);
+      *string_used = false;
       break;
 
     case N_EXCL: