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
44 lines
2.1 KiB
C++
44 lines
2.1 KiB
C++
// Check the layout of the vtable for a normal class.
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// RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -O1 -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables | FileCheck %s
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// We should be emitting comdats for each of the virtual function stubs and RTTI proxies
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// CHECK: $_ZN1A3fooEv.stub = comdat any
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// CHECK: $_ZTI1A.rtti_proxy = comdat any
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// VTable contains offsets and references to the hidden symbols
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// The vtable definition itself is private so we can take relative references to
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// it. The vtable symbol will be exposed through a public alias.
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// CHECK: @_ZTV1A.local = private unnamed_addr constant { [3 x i32] } { [3 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8* }** @_ZTI1A.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [3 x i32] }, { [3 x i32] }* @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.A*)* @_ZN1A3fooEv.stub to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [3 x i32] }, { [3 x i32] }* @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32)] }, align 4
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// CHECK: @_ZTVN10__cxxabiv117__class_type_infoE = external global i8*
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// CHECK: @_ZTS1A = constant [3 x i8] c"1A\00", align 1
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// CHECK: @_ZTI1A = constant { i8*, i8* } { i8* getelementptr inbounds (i8, i8* bitcast (i8** @_ZTVN10__cxxabiv117__class_type_infoE to i8*), i32 8), i8* getelementptr inbounds ([3 x i8], [3 x i8]* @_ZTS1A, i32 0, i32 0) }, align 8
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// The stub should be in a comdat
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// CHECK: @_ZTI1A.rtti_proxy = hidden unnamed_addr constant { i8*, i8* }* @_ZTI1A, comdat
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// The vtable symbol is exposed through an alias.
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// @_ZTV1A = dso_local unnamed_addr alias { [3 x i32] }, { [3 x i32] }* @_ZTV1A.local
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// CHECK: define void @_ZN1A3fooEv(%class.A* nocapture %this) unnamed_addr
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// CHECK-NEXT: entry:
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// CHECK-NEXT: ret void
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// CHECK-NEXT: }
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// This function should be in a comdat
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// CHECK: define hidden void @_ZN1A3fooEv.stub(%class.A* nocapture %0) unnamed_addr #{{[0-9]+}} comdat
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// CHECK-NEXT: entry:
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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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void A::foo() {}
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void A_foo(A *a) {
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a->foo();
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}
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