80 lines
3.3 KiB
C++
80 lines
3.3 KiB
C++
// RUN: %clang_cc1 %s -fno-rtti -cxx-abi microsoft -triple=i386-pc-win32 -emit-llvm -o - | FileCheck %s
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struct VBase {
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virtual void foo();
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virtual void bar();
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int field;
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};
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struct B : virtual VBase {
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virtual void foo();
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virtual void bar();
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};
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void B::foo() {
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// CHECK: define x86_thiscallcc void @"\01?foo@B@@UAEXXZ"(i8*
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//
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// B::foo gets 'this' cast to VBase* in ECX (i.e. this+8) so we
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// need to adjust 'this' before use.
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//
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// CHECK: %[[THIS_ADDR:.*]] = alloca %struct.B*, align 4
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// CHECK: %[[THIS_i8:.*]] = getelementptr i8* %[[ECX:.*]], i64 -8
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// CHECK: %[[THIS:.*]] = bitcast i8* %[[THIS_i8]] to %struct.B*
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// CHECK: store %struct.B* %[[THIS]], %struct.B** %[[THIS_ADDR]], align 4
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field = 42;
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// CHECK: %[[THIS:.*]] = load %struct.B** %[[THIS_ADDR]]
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// CHECK: %[[THIS8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
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// CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8* %[[THIS8]], i32 0
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// CHECK: %[[VBPTR8:.*]] = bitcast i8* %[[VBPTR]] to i8**
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// CHECK: %[[VBTABLE:.*]] = load i8** %[[VBPTR8]]
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// CHECK: %[[VBENTRY8:.*]] = getelementptr inbounds i8* %[[VBTABLE]], i32 4
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// CHECK: %[[VBENTRY:.*]] = bitcast i8* %[[VBENTRY8]] to i32*
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// CHECK: %[[VBOFFSET32:.*]] = load i32* %[[VBENTRY]]
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// CHECK: %[[VBOFFSET:.*]] = add nsw i32 0, %[[VBOFFSET32]]
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// CHECK: %[[THIS8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
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// CHECK: %[[VBASE_i8:.*]] = getelementptr inbounds i8* %[[THIS8]], i32 %[[VBOFFSET]]
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// CHECK: %[[VBASE:.*]] = bitcast i8* %[[VBASE_i8]] to %struct.VBase*
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// CHECK: %[[FIELD:.*]] = getelementptr inbounds %struct.VBase* %[[VBASE]], i32 0, i32 1
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// CHECK: store i32 42, i32* %[[FIELD]], align 4
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//
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// CHECK: ret void
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}
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void call_vbase_bar(B *obj) {
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// CHECK: define void @"\01?call_vbase_bar@@YAXPAUB@@@Z"(%struct.B* %obj)
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// CHECK: %[[OBJ:.*]] = load %struct.B
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obj->bar();
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// When calling a vbase's virtual method, one needs to adjust 'this'
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// at the caller site.
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//
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// CHECK: %[[OBJ_i8:.*]] = bitcast %struct.B* %[[OBJ]] to i8*
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// CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8* %[[OBJ_i8]], i32 0
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// CHECK: %[[VBPTR8:.*]] = bitcast i8* %[[VBPTR]] to i8**
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// CHECK: %[[VBTABLE:.*]] = load i8** %[[VBPTR8]]
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// CHECK: %[[VBENTRY8:.*]] = getelementptr inbounds i8* %[[VBTABLE]], i32 4
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// CHECK: %[[VBENTRY:.*]] = bitcast i8* %[[VBENTRY8]] to i32*
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// CHECK: %[[VBOFFSET32:.*]] = load i32* %[[VBENTRY]]
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// CHECK: %[[VBOFFSET:.*]] = add nsw i32 0, %[[VBOFFSET32]]
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// CHECK: %[[VBASE_i8:.*]] = getelementptr inbounds i8* %[[OBJ_i8]], i32 %[[VBOFFSET]]
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// CHECK: %[[VFPTR:.*]] = bitcast i8* %[[VBASE_i8]] to void (i8*)***
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// CHECK: %[[VFTABLE:.*]] = load void (i8*)*** %[[VFPTR]]
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// CHECK: %[[VFUN:.*]] = getelementptr inbounds void (i8*)** %[[VFTABLE]], i64 1
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// CHECK: %[[VFUN_VALUE:.*]] = load void (i8*)** %[[VFUN]]
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//
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// CHECK: %[[OBJ_i8:.*]] = bitcast %struct.B* %[[OBJ]] to i8*
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// CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8* %[[OBJ_i8]], i32 0
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// CHECK: %[[VBPTR8:.*]] = bitcast i8* %[[VBPTR]] to i8**
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// CHECK: %[[VBTABLE:.*]] = load i8** %[[VBPTR8]]
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// CHECK: %[[VBENTRY8:.*]] = getelementptr inbounds i8* %[[VBTABLE]], i32 4
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// CHECK: %[[VBENTRY:.*]] = bitcast i8* %[[VBENTRY8]] to i32*
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// CHECK: %[[VBOFFSET32:.*]] = load i32* %[[VBENTRY]]
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// CHECK: %[[VBOFFSET:.*]] = add nsw i32 0, %[[VBOFFSET32]]
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// CHECK: %[[VBASE:.*]] = getelementptr inbounds i8* %[[OBJ_i8]], i32 %[[VBOFFSET]]
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//
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// CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](i8* %[[VBASE]])
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//
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// CHECK: ret void
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}
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