[MS-ABI] Implement typeid

This patch enables clang to generate calls to __RTtypeid when lowering 
typeid on win32 targets.  Test cases are included.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211223 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 58 insertions, 0 deletions

diff --git a/test/CodeGenCXX/microsoft-abi-typeid.cpp b/test/CodeGenCXX/microsoft-abi-typeid.cpp
new file mode 100644
index 0000000000..ffbebec1fa
--- /dev/null
+++ b/test/CodeGenCXX/microsoft-abi-typeid.cpp
@@ -0,0 +1,58 @@
+// RUN: %clang_cc1 -emit-llvm -O2 -optzns -o - -triple=i386-pc-win32 2>/dev/null %s | FileCheck %s
+// REQUIRES: asserts
+
+struct type_info { const char* raw_name() const; };
+namespace std { using ::type_info; }
+
+struct V { virtual void f() {}; };
+struct A : virtual V {};
+
+A a;
+int b;
+A* fn();
+
+const std::type_info* test0_typeid() { return &typeid(int); }
+// CHECK: define %struct.type_info* @"\01?test0_typeid@@YAPBUtype_info@@XZ"() #0 {
+// CHECK-NEXT: entry:
+// CHECK-NEXT:   ret %struct.type_info* bitcast (%"MSRTTITypeDescriptor\02"* @"\01??_R0H@8" to %struct.type_info*)
+// CHECK-NEXT: }
+
+const std::type_info* test1_typeid() { return &typeid(A); }
+// CHECK: define %struct.type_info* @"\01?test1_typeid@@YAPBUtype_info@@XZ"() #0 {
+// CHECK-NEXT: entry:
+// CHECK-NEXT:   ret %struct.type_info* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUA@@@8" to %struct.type_info*)
+// CHECK-NEXT: }
+
+const std::type_info* test2_typeid() { return &typeid(&a); }
+// CHECK: define %struct.type_info* @"\01?test2_typeid@@YAPBUtype_info@@XZ"() #0 {
+// CHECK-NEXT: entry:
+// CHECK-NEXT:   ret %struct.type_info* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0PAUA@@@8" to %struct.type_info*)
+// CHECK-NEXT: }
+
+const std::type_info* test3_typeid() { return &typeid(*fn()); }
+// CHECK: define %struct.type_info* @"\01?test3_typeid@@YAPBUtype_info@@XZ"() #1 {
+// CHECK-NEXT: entry:
+// CHECK-NEXT:   %call = tail call %struct.A* @"\01?fn@@YAPAUA@@XZ"() #3
+// CHECK-NEXT:   %0 = icmp eq %struct.A* %call, null
+// CHECK-NEXT:   br i1 %0, label %type_id.call, label %type_id.valid
+// CHECK: type_id.valid:                                    ; preds = %entry
+// CHECK-NEXT:   %1 = bitcast %struct.A* %call to i8*
+// CHECK-NEXT:   %2 = bitcast %struct.A* %call to i8**
+// CHECK-NEXT:   %vbtable = load i8** %2, align 4
+// CHECK-NEXT:   %3 = getelementptr inbounds i8* %vbtable, i32 4
+// CHECK-NEXT:   %4 = bitcast i8* %3 to i32*
+// CHECK-NEXT:   %vbase_offs = load i32* %4, align 4
+// CHECK-NEXT:   %5 = getelementptr inbounds i8* %1, i32 %vbase_offs
+// CHECK-NEXT:   br label %type_id.call
+// CHECK: type_id.call:                                     ; preds = %type_id.valid, %entry
+// CHECK-NEXT:   %6 = phi i8* [ %5, %type_id.valid ], [ null, %entry ]
+// CHECK-NEXT:   %7 = tail call i8* @__RTtypeid(i8* %6) #3
+// CHECK-NEXT:   %8 = bitcast i8* %7 to %struct.type_info*
+// CHECK-NEXT:   ret %struct.type_info* %8
+// CHECK-NEXT: }
+
+const std::type_info* test4_typeid() { return &typeid(b); }
+// CHECK: define %struct.type_info* @"\01?test4_typeid@@YAPBUtype_info@@XZ"() #0 {
+// CHECK-NEXT: entry:
+// CHECK-NEXT:   ret %struct.type_info* bitcast (%"MSRTTITypeDescriptor\02"* @"\01??_R0H@8" to %struct.type_info*)
+// CHECK-NEXT: }