Add support for __builtin_{add,sub,mul}_overflow.

Patch by David Grayson!

llvm-svn: 251651

1 files changed, 22 insertions, 0 deletions

diff --git a/clang/test/Sema/builtins-overflow.c b/clang/test/Sema/builtins-overflow.c
new file mode 100644
index 00000000000..e2c07f08ec9
--- /dev/null
+++ b/clang/test/Sema/builtins-overflow.c
@@ -0,0 +1,22 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+#if __has_feature(__builtin_add_overflow)
+#warning defined as expected
+// expected-warning@-1 {{defined as expected}}
+#endif
+
+void test(void) {
+  unsigned r;
+  const char * c;
+  float f;
+  const unsigned q;
+
+  __builtin_add_overflow();  // expected-error {{too few arguments to function call, expected 3, have 0}}
+  __builtin_add_overflow(1, 1, 1, 1);  // expected-error {{too many arguments to function call, expected 3, have 4}}
+
+  __builtin_add_overflow(c, 1, &r);  // expected-error {{operand argument to overflow builtin must be an integer ('const char *' invalid)}}
+  __builtin_add_overflow(1, c, &r);  // expected-error {{operand argument to overflow builtin must be an integer ('const char *' invalid)}}
+  __builtin_add_overflow(1, 1, 3);  // expected-error {{result argument to overflow builtin must be a pointer to a non-const integer ('int' invalid)}}
+  __builtin_add_overflow(1, 1, &f);  // expected-error {{result argument to overflow builtin must be a pointer to a non-const integer ('float *' invalid)}}
+  __builtin_add_overflow(1, 1, &q);  // expected-error {{result argument to overflow builtin must be a pointer to a non-const integer ('const unsigned int *' invalid)}}
+}