54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
// RUN: %clang_cc1 -fno-rtti -emit-llvm %s -o - -mconstructor-aliases -triple=i386-pc-win32 | FileCheck %s
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// RUN: %clang_cc1 -fno-rtti -emit-llvm %s -o - -mconstructor-aliases -triple=i386-pc-win32 -fno-delete-null-pointer-checks | FileCheck %s
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struct Left {
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virtual void left();
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};
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struct Right {
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virtual void right();
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};
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struct ChildNoOverride : Left, Right {
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};
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struct ChildOverride : Left, Right {
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virtual void left();
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virtual void right();
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};
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extern "C" void foo(void *);
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void call_left_no_override(ChildNoOverride *child) {
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// CHECK: %[[CHILD:.*]] = load %struct.ChildNoOverride
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child->left();
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}
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void ChildOverride::left() {}
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void call_right_no_override(ChildNoOverride *child) {
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child->right();
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// When calling a right base's virtual method, one needs to adjust `this` at the caller site.
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//
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// CHECK: %[[CHILD_i8:.*]] = bitcast %struct.ChildNoOverride* %[[CHILD]] to i8*
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// CHECK: %[[RIGHT_i8:.*]] = getelementptr inbounds i8, i8* %[[CHILD_i8]], i32 4
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// CHECK: %[[RIGHT:.*]] = bitcast i8* %[[RIGHT_i8]] to %struct.Right*
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//
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// CHECK: %[[VFPTR:.*]] = bitcast %struct.Right* %[[RIGHT]] to void (%struct.Right*)***
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// CHECK: %[[VFTABLE:.*]] = load void (%struct.Right*)**, void (%struct.Right*)*** %[[VFPTR]]
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// CHECK: %[[VFUN:.*]] = getelementptr inbounds void (%struct.Right*)*, void (%struct.Right*)** %[[VFTABLE]], i64 0
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}
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void ChildOverride::right() {
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foo(this);
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}
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void call_right_override(ChildOverride *child) {
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child->right();
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// Ensure that `nonnull` and `dereferenceable(N)` are not emitted whether or not null is valid
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//
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// CHECK: %[[RIGHT:.*]] = getelementptr inbounds i8, i8* %[[CHILD_i8]], i32 4
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// CHECK: %[[VFUN_VALUE:.*]] = load void (i8*)*, void (i8*)** %[[VFUN]]
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// CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](i8* %[[RIGHT]])
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}
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