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48 lines
1.9 KiB
48 lines
1.9 KiB
4 months ago
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// Member pointer to virtual function.
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// RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -O3 -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables | FileCheck %s
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// CHECK: define void @_Z4funcP1AMS_FvvE(%class.A* %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:%.+]] = bitcast %class.A* %a to i8*
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// CHECK-NEXT: [[this_adj:%.+]] = getelementptr inbounds i8, i8* [[this]], 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: [[this:%.+]] = bitcast i8* [[this_adj]] to i8**
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// CHECK-NEXT: [[vtable:%.+]] = load i8*, i8** [[this]], align 8
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// CHECK-NEXT: [[offset:%.+]] = add i64 [[fn_ptr]], -1
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// CHECK-NEXT: [[ptr:%.+]] = tail call i8* @llvm.load.relative.i64(i8* [[vtable]], i64 [[offset]])
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// CHECK-NEXT: [[method:%.+]] = bitcast i8* [[ptr]] to void (%class.A*)*
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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 void (%class.A*)*
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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 void (%class.A*)* [ [[method]], %[[virt]] ], [ [[method2]], %[[nonvirt]] ]
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// CHECK-NEXT: [[a:%.+]] = bitcast i8* [[this_adj]] to %class.A*
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// CHECK-NEXT: tail call void [[method3]](%class.A* {{[^,]*}} [[a]])
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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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