re PR middle-end/38454 (memcpy folding breaks -D_FORTIFY_SOURCE=2 protection)

	PR middle-end/38454
	* function.h (struct function): Add always_inline_functions_inlined.
	* ipa-inline.c (cgraph_early_inlining): Set it to true.
	* tree-optimize.c (execute_fixup_cfg): Likewise.
	* builtins.c (avoid_folding_inline_builtin): New function.
	(fold_call_expr): Don't optimize always_inline builtins before
	inlining.
	(fold_call_stmt): Likewise.
	(fold_builtin_call_array): Likewise.  Don't call
	fold_builtin_varargs for BUILT_IN_MD builtins.

	* gcc.dg/memset-1.c: New test.
	* gcc.dg/memcpy-2.c: New test.

From-SVN: r142617

1 files changed, 25 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/memcpy-2.c b/gcc/testsuite/gcc.dg/memcpy-2.c
new file mode 100644
index 0000000..24464abd
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/memcpy-2.c
@@ -0,0 +1,25 @@
+/* PR middle-end/38454 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+extern inline __attribute__((gnu_inline, always_inline, artificial)) void *
+memcpy (void *__restrict dest, const void *__restrict src, size_t len)
+{
+  return __builtin___memcpy_chk (dest, /* { dg-warning "will always overflow destination buffer" } */
+				 src, len, __builtin_object_size (dest, 0));
+}
+
+struct S { char buf[10]; } s;
+
+void
+foo (void)
+{
+  char buf[12];
+  char *p = buf + 4;
+  struct S *q = (struct S *) p;
+  memcpy (q, &s, sizeof (s));
+}
+
+/* { dg-final { scan-assembler "__memcpy_chk" } } */