[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
diff --git a/clang/test/CodeGen/ms_this.cpp b/clang/test/CodeGen/ms_this.cpp
new file mode 100644
index 0000000..10cd52f
--- /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;
+}