From 83916498b80c4349b21f612b3c6dabc739517ed5 Mon Sep 17 00:00:00 2001
From: Chad Rosier <mcrosier@apple.com>
Date: Wed, 8 Aug 2012 20:37:31 +0000
Subject: [PATCH] [ms-inline asm] Add a very simple test case.  Basically,
 we're only testing for crashers at the moment (and coincidentally this case
 was causing a crash).

llvm-svn: 161520
---
 clang/lib/Sema/SemaStmt.cpp        | 6 ++++++
 clang/test/CodeGen/ms-inline-asm.c | 7 +++++++
 2 files changed, 13 insertions(+)
 create mode 100644 clang/test/CodeGen/ms-inline-asm.c

diff --git a/clang/lib/Sema/SemaStmt.cpp b/clang/lib/Sema/SemaStmt.cpp
index a8a06a9..be90578 100644
--- a/clang/lib/Sema/SemaStmt.cpp
+++ b/clang/lib/Sema/SemaStmt.cpp
@@ -2786,6 +2786,9 @@ static std::string PatchMSAsmString(Sema &SemaRef, bool &IsSimple,
                                     SourceLocation AsmLoc,
                                     ArrayRef<Token> AsmToks,
                                     const TargetInfo &TI) {
+  if (!AsmToks.size())
+    return "";
+
   std::string Res;
   IdentifierInfo *II = AsmToks[0].getIdentifierInfo();
   Res = II->getName().str();
@@ -2841,6 +2844,9 @@ static std::string PatchMSAsmString(Sema &SemaRef, bool &IsSimple,
 static std::string buildMSAsmString(Sema &SemaRef,
                                     ArrayRef<Token> AsmToks,
                                     ArrayRef<unsigned> LineEnds) {
+  if (!AsmToks.size())
+    return "";
+
   // Collect the tokens into a string
   SmallString<512> Asm;
   SmallString<512> TokenBuf;
diff --git a/clang/test/CodeGen/ms-inline-asm.c b/clang/test/CodeGen/ms-inline-asm.c
new file mode 100644
index 0000000..2d36bbc
--- /dev/null
+++ b/clang/test/CodeGen/ms-inline-asm.c
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 %s -triple x86_64-apple-darwin10 -O0 -fms-extensions -w -emit-llvm -o - | FileCheck %s
+
+void t1() {
+// CHECK: @t1
+// CHECK: ret void
+  __asm {}
+}
-- 
2.7.4