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
52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
// If the linkage of the class is internal, then the stubs and proxies should
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// also be internally linked.
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// RUN: %clang_cc1 %s -triple=x86_64-unknown-fuchsia -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables | FileCheck %s
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// External linkage.
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// CHECK: @_ZTI8External.rtti_proxy = hidden unnamed_addr constant { i8*, i8* }* @_ZTI8External, comdat
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class External {
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public:
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virtual void func();
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};
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void External::func() {}
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// Internal linkage.
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// CHECK: @_ZTIN12_GLOBAL__N_18InternalE.rtti_proxy = internal unnamed_addr constant { i8*, i8* }* @_ZTIN12_GLOBAL__N_18InternalE
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namespace {
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class Internal {
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public:
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virtual void func();
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};
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void Internal::func() {}
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} // namespace
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// This gets the same treatment as an externally available vtable.
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// CHECK: @_ZTI11LinkOnceODR.rtti_proxy = hidden unnamed_addr constant { i8*, i8* }* @_ZTI11LinkOnceODR, comdat
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class LinkOnceODR {
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public:
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virtual void func() {} // A method defined in the class definition results in this linkage for the vtable.
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};
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// Force an emission of a vtable for Internal by using it here.
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void manifest_internal() {
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Internal internal;
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(void)internal;
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LinkOnceODR linkonceodr;
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(void)linkonceodr;
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}
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// Aliases are typically emitted after the vtable definitions but before the
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// function definitions.
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// CHECK: @_ZTV8External = unnamed_addr alias { [3 x i32] }, { [3 x i32] }* @_ZTV8External.local
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// CHECK: @_ZTV11LinkOnceODR = linkonce_odr unnamed_addr alias { [3 x i32] }, { [3 x i32] }* @_ZTV11LinkOnceODR.local
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// CHECK: define void @_ZN8External4funcEv
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// CHECK: define internal void @_ZN12_GLOBAL__N_18Internal4funcEv.stub
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// CHECK: define hidden void @_ZN11LinkOnceODR4funcEv.stub
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