gas obj-coff memory leaks

This patch addresses memory leaks in gas that show up when running the
testsuite on x86_64-w64-mingw32.  The seh_ctx_cur, and weak sym naming
leaks can occur many times during assembly.  The symbol hook and
section leaks are not so important since this memory needs to persist
until closing the output bfd.

	* config/obj-coff-seh.c (do_seh_endproc): Free seh_ctx_cur and
	its fields.
	* config/obj-coff-seh.h (struct seh_context): Remove unused
	"next" field.
	* config/obj-coff.c (coff_obj_symbol_new_hook): Use notes_alloc
	for aux entries.
	(coff_obj_symbol_clone_hook): Likewise.
	(obj_coff_def): Don't strdup name unless we need to do so
	for tc_canonicalize_symbol_name.  Free after making symbol.
	(weak_name2altname, weak_altname2name): Return a char*.
	(weak_uniquify): Use notes_concat.
	(pecoff_obj_set_weak_hook, pecoff_obj_clear_weak_hook): Free name
	returned by weak_name2altname.
	(coff_frob_symbol): Similarly for weak_altname2name.
	(obj_coff_section): Use notes_memdup0.
	* symbols.h: Add include guard.
	(notes_memdup0): New inline function.

gas/config/obj-coff-seh.c

@@ -417,6 +417,9 @@ do_seh_endproc (void)
 
   write_function_xdata (seh_ctx_cur);
   write_function_pdata (seh_ctx_cur);
+  free (seh_ctx_cur->elems);
+  free (seh_ctx_cur->func_name);
+  free (seh_ctx_cur);
   seh_ctx_cur = NULL;
 }
 

gas/config/obj-coff-seh.h

@@ -89,8 +89,6 @@ typedef struct seh_prologue_element
 
 typedef struct seh_context
 {
-  struct seh_context *next;
-
   /* Initial code-segment.  */
   segT code_seg;
   /* Function name.  */

gas/config/obj-coff.c

@@ -368,8 +368,8 @@ static symbolS *line_fsym;
 void
 coff_obj_symbol_new_hook (symbolS *symbolP)
 {
-  long   sz = (OBJ_COFF_MAX_AUXENTRIES + 1) * sizeof (combined_entry_type);
-  char * s  = XNEWVEC (char, sz);
+  size_t sz = (OBJ_COFF_MAX_AUXENTRIES + 1) * sizeof (combined_entry_type);
+  char *s  = notes_alloc (sz);
 
   memset (s, 0, sz);
   coffsymbol (symbol_get_bfdsym (symbolP))->native = (combined_entry_type *) s;
@@ -389,11 +389,10 @@ coff_obj_symbol_new_hook (symbolS *symbolP)
 void
 coff_obj_symbol_clone_hook (symbolS *newsymP, symbolS *orgsymP)
 {
-  long elts = OBJ_COFF_MAX_AUXENTRIES + 1;
-  combined_entry_type * s = XNEWVEC (combined_entry_type, elts);
+  size_t sz = (OBJ_COFF_MAX_AUXENTRIES + 1) * sizeof (combined_entry_type);
+  combined_entry_type *s = notes_alloc (sz);
 
-  memcpy (s, coffsymbol (symbol_get_bfdsym (orgsymP))->native,
-	  elts * sizeof (combined_entry_type));
+  memcpy (s, coffsymbol (symbol_get_bfdsym (orgsymP))->native, sz);
   coffsymbol (symbol_get_bfdsym (newsymP))->native = s;
 
   SF_SET (newsymP, SF_GET (orgsymP));
@@ -573,10 +572,6 @@ obj_coff_ident (int ignore ATTRIBUTE_UNUSED)
 static void
 obj_coff_def (int what ATTRIBUTE_UNUSED)
 {
-  char name_end;		/* Char after the end of name.  */
-  char *symbol_name;		/* Name of the debug symbol.  */
-  char *symbol_name_copy;	/* Temporary copy of the name.  */
-
   if (def_symbol_in_progress != NULL)
     {
       as_warn (_(".def pseudo-op used inside of .def/.endef: ignored."));
@@ -586,14 +581,18 @@ obj_coff_def (int what ATTRIBUTE_UNUSED)
 
   SKIP_WHITESPACES ();
 
-  name_end = get_symbol_name (&symbol_name);
-  symbol_name_copy = xstrdup (symbol_name);
+  char *symbol_name;
+  char name_end = get_symbol_name (&symbol_name);
+  char *symbol_name_copy = NULL;
+  char *canon_name = symbol_name;
 #ifdef tc_canonicalize_symbol_name
-  symbol_name_copy = tc_canonicalize_symbol_name (symbol_name_copy);
+  symbol_name_copy = xstrdup (symbol_name);
+  canon_name = tc_canonicalize_symbol_name (symbol_name_copy);
 #endif
 
   /* Initialize the new symbol.  */
-  def_symbol_in_progress = symbol_make (symbol_name_copy);
+  def_symbol_in_progress = symbol_make (canon_name);
+  free (symbol_name_copy);
   symbol_set_frag (def_symbol_in_progress, &zero_address_frag);
   S_SET_VALUE (def_symbol_in_progress, 0);
 
@@ -1060,7 +1059,7 @@ weak_is_altname (const char * name)
 /* Return the name of the alternate symbol
    name corresponding to a weak symbol's name.  */
 
-static const char *
+static char *
 weak_name2altname (const char * name)
 {
   return concat (weak_altprefix, name, (char *) NULL);
@@ -1069,7 +1068,7 @@ weak_name2altname (const char * name)
 /* Return the name of the weak symbol corresponding to an
    alternate symbol.  */
 
-static const char *
+static char *
 weak_altname2name (const char * name)
 {
   gas_assert (weak_is_altname (name));
@@ -1090,7 +1089,7 @@ weak_uniquify (const char * name)
 #endif
   gas_assert (weak_is_altname (name));
 
-  return concat (name, ".", unique, (char *) NULL);
+  return notes_concat (name, ".", unique, (char *) NULL);
 }
 
 void
@@ -1107,7 +1106,9 @@ pecoff_obj_set_weak_hook (symbolS *symbolP)
   S_SET_NUMBER_AUXILIARY (symbolP, 1);
   SA_SET_SYM_FSIZE (symbolP, IMAGE_WEAK_EXTERN_SEARCH_NOLIBRARY);
 
-  alternateP = symbol_find_or_make (weak_name2altname (S_GET_NAME (symbolP)));
+  char *altname = weak_name2altname (S_GET_NAME (symbolP));
+  alternateP = symbol_find_or_make (altname);
+  free (altname);
   S_SET_EXTERNAL (alternateP);
   S_SET_STORAGE_CLASS (alternateP, C_NT_WEAK);
 
@@ -1122,7 +1123,9 @@ pecoff_obj_clear_weak_hook (symbolS *symbolP)
   S_SET_STORAGE_CLASS (symbolP, 0);
   SA_SET_SYM_FSIZE (symbolP, 0);
 
-  alternateP = symbol_find (weak_name2altname (S_GET_NAME (symbolP)));
+  char *altname = weak_name2altname (S_GET_NAME (symbolP));
+  alternateP = symbol_find (altname);
+  free (altname);
   S_CLEAR_EXTERNAL (alternateP);
 }
 
@@ -1216,9 +1219,9 @@ coff_frob_symbol (symbolS *symp, int *punt)
     {
       /* This is a weak alternate symbol.  All processing of
 	 PECOFFweak symbols is done here, through the alternate.  */
-      symbolS *weakp = symbol_find_noref (weak_altname2name
-					  (S_GET_NAME (symp)), 1);
-
+      char *weakname = weak_altname2name (S_GET_NAME (symp));
+      symbolS *weakp = symbol_find_noref (weakname, 1);
+      free (weakname);
       gas_assert (weakp);
       gas_assert (S_GET_NUMBER_AUXILIARY (weakp) == 1);
 
@@ -1554,7 +1557,7 @@ obj_coff_section (int ignore ATTRIBUTE_UNUSED)
     }
 
   c = get_symbol_name (&section_name);
-  name = xmemdup0 (section_name, input_line_pointer - section_name);
+  name = notes_memdup0 (section_name, input_line_pointer - section_name);
   restore_line_pointer (c);
   SKIP_WHITESPACE ();
 

gas/symbols.h

@@ -18,6 +18,9 @@
    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
    02110-1301, USA.  */
 
+#ifndef GAS_SYMBOLS_H
+#define GAS_SYMBOLS_H
+
 extern struct obstack notes;	/* eg FixS live here.  */
 
 extern struct obstack cond_obstack;	/* this is where we track .ifdef/.endif
@@ -42,6 +45,12 @@ extern char *notes_strdup (const char *);
 extern char *notes_concat (const char *, ...);
 extern void notes_free (void *);
 
+static inline char *
+notes_memdup0 (const char *in, size_t len)
+{
+  return notes_memdup (in, len, len + 1);
+}
+
 char * symbol_relc_make_expr  (expressionS *);
 char * symbol_relc_make_sym   (symbolS *);
 char * symbol_relc_make_value (offsetT);
@@ -228,3 +237,5 @@ void symbol_set_obj (symbolS *, OBJ_SYMFIELD_TYPE *);
 TC_SYMFIELD_TYPE *symbol_get_tc (symbolS *);
 void symbol_set_tc (symbolS *, TC_SYMFIELD_TYPE *);
 #endif
+
+#endif /* GAS_SYMBOLS_H */