re PR tree-optimization/49243 (attribute((returns_twice)) doesn't work)

2011-06-06  Mikael Pettersson  <mikpe@it.uu.se>

	PR tree-optimization/49243
	* calls.c (setjmp_call_p): Also check if fndecl has the
	returns_twice attribute.

	* gcc.dg/pr49243.c: New.

From-SVN: r174695

gcc/ChangeLog

+2011-06-06  Mikael Pettersson  <mikpe@it.uu.se>
+
+	PR tree-optimization/49243
+	* calls.c (setjmp_call_p): Also check if fndecl has the
+	returns_twice attribute.
+
 2011-06-06  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* config/mips/iris6.h (ENDFILE_SPEC): Use crtfastmath.o if

gcc/calls.c

@@ -567,6 +567,8 @@ special_function_p (const_tree fndecl, int flags)
 int
 setjmp_call_p (const_tree fndecl)
 {
+  if (DECL_IS_RETURNS_TWICE (fndecl))
+    return ECF_RETURNS_TWICE;
   return special_function_p (fndecl, 0) & ECF_RETURNS_TWICE;
 }
 

gcc/testsuite/ChangeLog

+2011-06-06  Mikael Pettersson  <mikpe@it.uu.se>
+
+	PR tree-optimization/49243
+	* gcc.dg/pr49243.c: New.
+
 2011-06-06  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gnat.dg/specs/cond_expr1.ads: New test.

gcc/testsuite/gcc.dg/pr49243.c

+/* PR tree-optimization/49243 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -Winline" } */
+
+extern unsigned long jb[];
+extern int my_setjmp(unsigned long jb[]) __attribute__((returns_twice));
+extern int decode(const char*);
+
+static inline int wrapper(const char **s_ptr) /* { dg-warning "(inlining failed|function 'wrapper' can never be inlined because it uses setjmp)" } */
+{
+    if (my_setjmp(jb) == 0) {
+	const char *s = *s_ptr;
+	while (decode(s) != 0)
+	    *s_ptr = ++s;
+	return 0;
+    } else
+	return -1;
+}
+
+void parse(const char *data)
+{
+    const char *s = data;
+    if (!(wrapper(&s) == -1 && (s - data) == 1)) /* { dg-warning "called from here" } */
+	__builtin_abort();
+}