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51 lines
1.4 KiB
C++
51 lines
1.4 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 ptr
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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: %[[RIGHT_i8:.*]] = getelementptr inbounds i8, ptr %[[CHILD]], i32 4
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//
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// CHECK: %[[VFTABLE:.*]] = load ptr, ptr %[[RIGHT_i8]]
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// CHECK: %[[VFUN:.*]] = getelementptr inbounds ptr, ptr %[[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, ptr %[[CHILD]], i32 4
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// CHECK: %[[VFUN_VALUE:.*]] = load ptr, ptr %[[VFUN]]
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// CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](ptr noundef %[[RIGHT]])
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}
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