c: Split -Wcalloc-transposed-args warning from -Walloc-size, -Walloc-size fixes

The following patch changes -Walloc-size warning to no longer warn
about int *p = calloc (1, sizeof (int));, because as discussed earlier,
the size is IMNSHO sufficient in that case, for alloc_size with 2
arguments warns if the product of the 2 arguments is insufficiently small.

Also, it warns also for explicit casts of malloc/calloc etc. calls
rather than just implicit, so not just
  int *p = malloc (1);
but also
  int *p = (int *) malloc (1);

It also fixes some ICEs where the code didn't verify the alloc_size
arguments properly (Walloc-size-5.c testcase ICEs with vanilla trunk).

And lastly, it introduces a coding style warning, -Wcalloc-transposed-args
to warn for calloc (sizeof (struct S), 1) and similar calls (regardless
of what they are cast to, warning whenever first argument is sizeof and
the second is not).

2023-12-20  Jakub Jelinek  <jakub@redhat.com>

gcc/
	* doc/invoke.texi (-Walloc-size): Add to the list of
	warning options, remove unnecessary line-break.
	(-Wcalloc-transposed-args): Document new warning.
gcc/c-family/
	* c.opt (Wcalloc-transposed-args): New warning.
	* c-common.h (warn_for_calloc, warn_for_alloc_size): Declare.
	* c-warn.cc (warn_for_calloc, warn_for_alloc_size): New functions.
gcc/c/
	* c-parser.cc (c_parser_postfix_expression_after_primary): Grow
	sizeof_arg and sizeof_arg_loc arrays to 6 elements.  Call
	warn_for_calloc if warn_calloc_transposed_args for functions with
	alloc_size type attribute with 2 arguments.
	(c_parser_expr_list): Use 6 instead of 3.
	* c-typeck.cc (build_c_cast): Call warn_for_alloc_size for casts
	of calls to functions with alloc_size type attribute.
	(convert_for_assignment): Likewise.
gcc/testsuite/
	* gcc.dg/Walloc-size-4.c: New test.
	* gcc.dg/Walloc-size-5.c: New test.
	* gcc.dg/Wcalloc-transposed-args-1.c: New test.

1 files changed, 11 insertions, 4 deletions

diff --git a/gcc/c/c-parser.cc b/gcc/c/c-parser.cc
index 4f1e066..c372430 100644
--- a/gcc/c/c-parser.cc
+++ b/gcc/c/c-parser.cc
@@ -12478,8 +12478,8 @@ c_parser_postfix_expression_after_primary (c_parser *parser,
 {
   struct c_expr orig_expr;
   tree ident, idx;
-  location_t sizeof_arg_loc[3], comp_loc;
-  tree sizeof_arg[3];
+  location_t sizeof_arg_loc[6], comp_loc;
+  tree sizeof_arg[6];
   unsigned int literal_zero_mask;
   unsigned int i;
   vec<tree, va_gc> *exprlist;
@@ -12512,7 +12512,7 @@ c_parser_postfix_expression_after_primary (c_parser *parser,
 	  {
 	    matching_parens parens;
 	    parens.consume_open (parser);
-	    for (i = 0; i < 3; i++)
+	    for (i = 0; i < 6; i++)
 	      {
 		sizeof_arg[i] = NULL_TREE;
 		sizeof_arg_loc[i] = UNKNOWN_LOCATION;
@@ -12577,6 +12577,13 @@ c_parser_postfix_expression_after_primary (c_parser *parser,
 				      "not permitted in intervening code");
 		  parser->omp_for_parse_state->fail = true;
 		}
+	      if (warn_calloc_transposed_args)
+		if (tree attr = lookup_attribute ("alloc_size",
+						  TYPE_ATTRIBUTES
+						    (TREE_TYPE (expr.value))))
+		  if (TREE_VALUE (attr) && TREE_CHAIN (TREE_VALUE (attr)))
+		    warn_for_calloc (sizeof_arg_loc, expr.value, exprlist,
+				     sizeof_arg, attr);
 	    }
 
 	  start = expr.get_start ();
@@ -12861,7 +12868,7 @@ c_parser_expr_list (c_parser *parser, bool convert_p, bool fold_p,
 	vec_safe_push (orig_types, expr.original_type);
       if (locations)
 	locations->safe_push (expr.get_location ());
-      if (++idx < 3
+      if (++idx < 6
 	  && sizeof_arg != NULL
 	  && (expr.original_code == SIZEOF_EXPR
 	      || expr.original_code == PAREN_SIZEOF_EXPR))