gas macro memory leaks

This tidies memory allocated for entries in macro_hash.  Freeing the
macro name requires a little restructuring of the define_macro
interface due to the name being used in the error message, and exposed
the fact that the name and other fields were not initialised by the
iq2000 backend.

There is also a fix for
 .macro .macro
 .endm
 .macro .macro
 .endm
which prior to this patch reported
mac.s:1: Warning: attempt to redefine pseudo-op `.macro' ignored
mac.s:3: Error: Macro `.macro' was already defined
rather than reporting the attempt to redefine twice.

	* macro.c (macro_del_f): New function.
	(macro_init): Use it when creating macro_hash.
	(free_macro): Free macro name too.
	(define_macro): Return the macro_entry, remove idx, file, line and
	namep params.  Call as_where.  Report errors here.  Delete macro
	from macro_hash on attempt to redefined pseudo-op.
	(delete_macro): Don't call free_macro.
	* macro.h (define_macro): Update prototype.
	* read.c (s_macro): Adjust to suit.
	* config/tc-iq2000.c (iq2000_add_macro): Init all fields of
	macro_entry.

1 files changed, 25 insertions, 21 deletions

diff --git a/gas/macro.c b/gas/macro.c
index ed1e9ef..763bafb 100644
--- a/gas/macro.c
+++ b/gas/macro.c
@@ -70,13 +70,23 @@ static size_t (*macro_expr) (const char *, size_t, sb *, offsetT *);
 
 static int macro_number;
 
+static void free_macro (macro_entry *);
+
+static void
+macro_del_f (void *ent)
+{
+  string_tuple_t *tuple = ent;
+  free_macro ((macro_entry *) tuple->value);
+}
+
 /* Initialize macro processing.  */
 
 void
 macro_init (int alternate, int mri, int strip_at,
 	    size_t (*exp) (const char *, size_t, sb *, offsetT *))
 {
-  macro_hash = str_htab_create ();
+  macro_hash = htab_create_alloc (16, hash_string_tuple, eq_string_tuple,
+				  macro_del_f, notes_calloc, NULL);
   macro_defined = 0;
   macro_alternate = alternate;
   macro_mri = mri;
@@ -664,34 +674,30 @@ free_macro (macro_entry *macro)
     }
   htab_delete (macro->formal_hash);
   sb_kill (&macro->sub);
+  free ((char *) macro->name);
   free (macro);
 }
 
-/* Define a new macro.  Returns NULL on success, otherwise returns an
-   error message.  If NAMEP is not NULL, *NAMEP is set to the name of
-   the macro which was defined.  */
+/* Define a new macro.  */
 
-const char *
-define_macro (size_t idx, sb *in, sb *label,
-	      size_t (*get_line) (sb *),
-	      const char *file, unsigned int line,
-	      const char **namep)
+macro_entry *
+define_macro (sb *in, sb *label, size_t (*get_line) (sb *))
 {
   macro_entry *macro;
   sb name;
+  size_t idx;
   const char *error = NULL;
 
   macro = XNEW (macro_entry);
   sb_new (&macro->sub);
   sb_new (&name);
-  macro->file = file;
-  macro->line = line;
+  macro->file = as_where (&macro->line);
 
   macro->formal_count = 0;
   macro->formals = 0;
   macro->formal_hash = str_htab_create ();
 
-  idx = sb_skip_white (idx, in);
+  idx = sb_skip_white (0, in);
   if (! buffer_and_nest ("MACRO", "ENDM", &macro->sub, get_line))
     error = _("unexpected end of file in macro `%s' definition");
   if (label != NULL && label->len != 0)
@@ -740,15 +746,16 @@ define_macro (size_t idx, sb *in, sb *label,
 	error = _("Macro `%s' was already defined");
     }
 
-  if (namep != NULL)
-    *namep = macro->name;
-
   if (!error)
     macro_defined = 1;
   else
-    free_macro (macro);
+    {
+      as_bad_where (macro->file, macro->line, error, macro->name);
+      free_macro (macro);
+      macro = NULL;
+    }
 
-  return error;
+  return macro;
 }
 
 /* Scan a token, and then skip KIND.  */
@@ -1318,10 +1325,7 @@ delete_macro (const char *name)
 
   macro = str_hash_find (macro_hash, copy);
   if (macro != NULL)
-    {
-      free_macro (macro);
-      str_hash_delete (macro_hash, copy);
-    }
+    str_hash_delete (macro_hash, copy);
   else
     as_warn (_("Attempt to purge non-existing macro `%s'"), copy);
   free (copy);