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
49 lines
2.3 KiB
C++
49 lines
2.3 KiB
C++
// Cross comdat example
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// Parent VTable is in a comdat section.
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// RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables | FileCheck %s
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// A::foo() has a comdat since it is an inline function
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// CHECK: $_ZN1A3fooEv = comdat any
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// CHECK: $_ZN1A3fooEv.stub = comdat any
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// CHECK: $_ZTV1A = comdat any
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// CHECK: $_ZTS1A = comdat any
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// The VTable for A has its own comdat section bc it has no key function
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// CHECK: $_ZTI1A = comdat any
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// CHECK: $_ZTI1A.rtti_proxy = comdat any
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// The VTable for A is emitted here and in a comdat section since it has no key function, and is used in this module when creating an instance of A.
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// CHECK: @_ZTV1A.local = linkonce_odr hidden unnamed_addr constant { [3 x i32] } { [3 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8* }** @_ZTI1A.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [3 x i32] }, { [3 x i32] }* @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.A*)* @_ZN1A3fooEv.stub to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [3 x i32] }, { [3 x i32] }* @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32)] }, comdat($_ZTV1A), align 4
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// CHECK: @_ZTVN10__cxxabiv117__class_type_infoE = external global i8*
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// CHECK: @_ZTS1A = linkonce_odr constant [3 x i8] c"1A\00", comdat, align 1
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// CHECK: @_ZTI1A = linkonce_odr 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) }, comdat, align 8
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// CHECK: @_ZTI1A.rtti_proxy = hidden unnamed_addr constant { i8*, i8* }* @_ZTI1A, comdat
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// CHECK: @_ZTV1A = linkonce_odr unnamed_addr alias { [3 x i32] }, { [3 x i32] }* @_ZTV1A.local
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// CHECK: define linkonce_odr void @_ZN1A3fooEv(%class.A* %this) unnamed_addr #{{[0-9]+}} comdat
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// CHECK: define hidden void @_ZN1A3fooEv.stub(%class.A* %0) unnamed_addr #{{[0-9]+}} comdat {
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// CHECK-NEXT: entry:
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// CHECK-NEXT: tail call void @_ZN1A3fooEv(%class.A* %0)
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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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inline 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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void A_foo(A *a);
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void A_foo(A *a) { a->foo(); }
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// func() is only used to emit a vtable.
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void func() {
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A a;
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A_foo(&a);
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}
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