Fix up vla, vm and [*] sematics.

	PR c/18740
	PR c/7948
	PR c/25802
	* c-tree.h (struct c_arg_info): Add had_vla_unspec.
	(c_vla_unspec_p): Add.
	(c_vla_type_p): Add.
	* c-decl.c (struct c_scope): Add had_vla_unspec.
	(build_array_declarator): Add support for [*].
	(grokdeclarator): Likewise.
	(grokparms): Likewise.
	(get_parm_info): Likewise.
	* c-objc-common.c (c_vla_unspec_p): Likewise.
	* c-objc-common.h (LANG_HOOKS_TREE_INLINING_VAR_MOD_TYPE_P): Likewise.
	* c-parser.c (c_parser_typeof_specifier): Evaluate arguments to
	typeof when argument is a variably modified type not inside sizeof or alignof.
	(c_parser_direct_declarator_inner): Propagate errors.
	(c_parser_sizeof_expression): Add support for [*].
	* c-typeck.c (c_vla_type_p): Add.
	(composite_type): Add support for vla compositing.
	(comptypes_internal): Add support for vla compatibility.
	(c_expr_sizeof_expr): Evaluate vla arguments.
	* tree.c (variably_modified_type_p): Update comment for [*].

testsuite:
	* gcc.dg/c90-arraydecl-1.c: Update for vla, vm [*] fixups.
	* gcc.dg/vla-4.c: Add.
	* gcc.dg/vla-5.c: Add.
	* gcc.dg/vla-6.c: Add.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@113888 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 48 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/vla-4.c b/gcc/testsuite/gcc.dg/vla-4.c
new file mode 100644
index 00000000000..7ffbfb31b8e
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vla-4.c
@@ -0,0 +1,48 @@
+/* { dg-do run } */
+/* { dg-options "-std=c99 -pedantic-errors" } */
+/* PR c/18740 */
+
+static int i;
+
+int foo(int n)
+{
+  int (*t)[n];
+  i = 0;
+  int j = 0;
+  char b[1][n+3];			/* Variable length array.  */
+  int d[3][n];				/* Variable length array.  */
+  sizeof (b[i++ + sizeof(j++)]);	/* Outer sizeof is evaluated for vla, but not the inner one.  */
+  if (i != 1 || j != 0)
+    return 1;
+  __typeof__(b[i++]) c1;		/* typeof is evauluated when given a vm */
+  if (i != 2)
+    return 1;
+  __typeof__(t + (i++,0)) c2;		/* typeof is evauluated when given a vm */
+  if (i != 3)
+    return 1;
+  __typeof__(i + (i++,0)) c3;		/* typeof is not evauluated when not given a vm */
+  if (i != 3)
+    return 1;
+  sizeof (d[i++]);			/* sizeof is evaluated for vla.  */
+  if (i != 4)
+    return 1;
+  __alignof__(__typeof__(t + (i++,0)));	/* typeof is not evauluated when given a vm inside alignof*/
+  if (i != 4)
+    return 1;
+  sizeof(__typeof__(t + (i++,0)));	/* typeof is not evauluated when given a vm inside sizeof*/
+  if (i != 4)
+    return 1;
+  return 0;
+}
+
+int foo6(int a, int b[a][a], int (*c)[sizeof(*b)]) {
+  return sizeof (*c);
+}
+
+int main() {
+  int b[10][10];
+  int (*c)[sizeof(int)*10];
+  if (foo6(10, b, c) != 10*sizeof(int)*sizeof(int))
+    return 1;
+  return foo(10);
+}