Emit an error message instead of crashing when dereferencing an incomplete pointer type.

If the ASM statement is dereferencing an incomplete pointer type, issue an error
instead of crashing.
<rdar://problem/12700799>

llvm-svn: 177915

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/test/Sema/asm.c b/clang/test/Sema/asm.c
index 155d736b995..b901e378cf3 100644
--- a/clang/test/Sema/asm.c
+++ b/clang/test/Sema/asm.c
@@ -123,3 +123,10 @@ void test13(void) {
   void *esp;
   __asm__ volatile ("mov %%esp, %o" : "=r"(esp) : : ); // expected-error {{invalid % escape in inline assembly string}}
 }
+
+// <rdar://problem/12700799>
+struct S;
+void test14(struct S *s) {
+  __asm("": : "a"(*s)); // expected-error {{dereference of pointer to incomplete type 'struct S'}}
+  __asm("": "=a" (*s) :); // expected-error {{dereference of pointer to incomplete type 'struct S'}}
+}