71568a9e28
This patch contains all of the clang changes from D72959. - Generalize the relative vtables ABI such that it can be used by other targets. - Add an enum VTableComponentLayout which controls whether components in the vtable should be pointers to other structs or relative offsets to those structs. Other ABIs can change this enum to restructure how components in the vtable are laid out/accessed. - Add methods to ConstantInitBuilder for inserting relative offsets to a specified position in the aggregate being constructed. - Fix failing tests under new PM and ASan and MSan issues. See D72959 for background info. Differential Revision: https://reviews.llvm.org/D77592
48 lines
1.9 KiB
C++
48 lines
1.9 KiB
C++
// 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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