[Microsoft][C++] Clang doesn't support a use of "this" pointer inside inline asm

Clang doesn’t support a use of “this” pointer inside inline asm.
When I tried to compile a class or a struct (see example) with an inline asm that contains "this" pointer.
Clang returns with an error.
This patch fixes that.

error: expected unqualified-id
For example:
'''
struct A {
    void f() {
          __asm mov eax, this
              // error: expected unqualified-id
                  }
};
'''
Differential Revision: http://reviews.llvm.org/D15115

llvm-svn: 255645

1 files changed, 49 insertions, 0 deletions

diff --git a/clang/test/CodeGen/ms_this.cpp b/clang/test/CodeGen/ms_this.cpp
new file mode 100644
index 00000000000..10cd52ffc64
--- /dev/null
+++ b/clang/test/CodeGen/ms_this.cpp
@@ -0,0 +1,49 @@
+// RUN: %clang_cc1 -fasm-blocks -emit-llvm %s -o - | FileCheck %s
+class t1 {
+public:
+  double a;
+  void runc();
+};
+
+class t2 {
+public:
+  double a;
+  void runc();
+};
+
+void t2::runc() {
+  double num = 0;
+  __asm {
+      mov rax,[this]
+      //CHECK: %this.addr = alloca %class.t2*
+      //CHECK: call void asm sideeffect inteldialect "mov rax,qword ptr $1{{.*}}%class.t2* %this1
+      mov rbx,[rax]
+      mov num, rbx
+	   };
+}
+
+void t1::runc() {
+  double num = 0;
+  __asm {
+       mov rax,[this]
+      //CHECK: %this.addr = alloca %class.t1*
+      //CHECK: call void asm sideeffect inteldialect "mov rax,qword ptr $1{{.*}}%class.t1* %this1
+        mov rbx,[rax]
+        mov num, rbx
+	   };
+}
+
+struct s {
+  int a;
+  void func() {
+    __asm mov rax, [this]
+    //CHECK: %this.addr = alloca %struct.s*
+    //CHECK: call void asm sideeffect inteldialect "mov rax, qword ptr $0{{.*}}%struct.s* %this1
+  }
+} f3;
+
+int main() {
+  f3.func();
+  f3.a=1;
+  return 0;
+}