44 lines
1.6 KiB
C++
44 lines
1.6 KiB
C++
// Member pointer to virtual function.
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// RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -O3 -S -o - -emit-llvm | FileCheck %s
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// CHECK: define{{.*}} void @_Z4funcP1AMS_FvvE(ptr noundef %a, [2 x i64] %fn.coerce) local_unnamed_addr
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[fn_ptr:%.+]] = extractvalue [2 x i64] %fn.coerce, 0
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// CHECK-NEXT: [[adjust:%.+]] = extractvalue [2 x i64] %fn.coerce, 1
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// CHECK-NEXT: [[this_adj:%.+]] = getelementptr inbounds i8, ptr %a, i64 [[adjust]]
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// CHECK-NEXT: [[virtbit:%.+]] = and i64 [[fn_ptr]], 1
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// CHECK-NEXT: [[isvirt:%.+]] = icmp eq i64 [[virtbit]], 0
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// CHECK-NEXT: br i1 [[isvirt]], label %[[nonvirt:.+]], label %[[virt:.+]]
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// CHECK: [[virt]]:
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// The loading of the virtual function here should be replaced with a llvm.load.relative() call.
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// CHECK-NEXT: [[vtable:%.+]] = load ptr, ptr [[this_adj]], align 8
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// CHECK-NEXT: [[offset:%.+]] = add i64 [[fn_ptr]], -1
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// CHECK-NEXT: [[ptr:%.+]] = tail call ptr @llvm.load.relative.i64(ptr [[vtable]], i64 [[offset]])
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// CHECK-NEXT: br label %[[memptr_end:.+]]
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// CHECK: [[nonvirt]]:
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// CHECK-NEXT: [[method2:%.+]] = inttoptr i64 [[fn_ptr]] to ptr
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// CHECK-NEXT: br label %[[memptr_end]]
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// CHECK: [[memptr_end]]:
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// CHECK-NEXT: [[method3:%.+]] = phi ptr [ [[ptr]], %[[virt]] ], [ [[method2]], %[[nonvirt]] ]
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// CHECK-NEXT: tail call void [[method3]](ptr {{[^,]*}} [[this_adj]])
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// CHECK-NEXT: ret void
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// CHECK-NEXT: }
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class A {
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public:
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virtual void foo();
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};
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class B : public A {
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public:
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void foo() override;
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};
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typedef void (A::*A_foo)();
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void func(A *a, A_foo fn) {
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(a->*fn)();
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}
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