d1fd72343c
The idea is that the CC1 default for ELF should set dso_local on default visibility external linkage definitions in the default -mrelocation-model pic mode (-fpic/-fPIC) to match COFF/Mach-O and make output IR similar. The refactoring is made available by 2820a2ca3a0e69c3f301845420e0067ffff2251b. Currently only x86 supports local aliases. We move the decision to the driver. There are three CC1 states: * -fsemantic-interposition: make some linkages interposable and make default visibility external linkage definitions dso_preemptable. * (default): selected if the target supports .Lfoo$local: make default visibility external linkage definitions dso_local * -fhalf-no-semantic-interposition: if neither option is set or the target does not support .Lfoo$local: like -fno-semantic-interposition but local aliases are not used. So references can be interposed if not optimized out. Add -fhalf-no-semantic-interposition to a few tests using the half-based semantic interposition behavior.
26 lines
1.6 KiB
C++
26 lines
1.6 KiB
C++
// Check the vtable layout for classes with key functions defined in different
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// translation units. This TU manifests the vtable for B.
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// RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -O1 -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables -fhalf-no-semantic-interposition | FileCheck %s
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#include "cross-tu-header.h"
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// CHECK: $_ZTI1B.rtti_proxy = comdat any
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// CHECK: @_ZTV1B.local = private unnamed_addr constant { [4 x i32] } { [4 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8*, i8* }** @_ZTI1B.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32] }, { [4 x i32] }* @_ZTV1B.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.B*)* dso_local_equivalent @_ZN1B3fooEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32] }, { [4 x i32] }* @_ZTV1B.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.A*)* dso_local_equivalent @_ZN1A3barEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32] }, { [4 x i32] }* @_ZTV1B.local, i32 0, i32 0, i32 2) to i64)) to i32)] }, align 4
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// CHECK: @_ZTV1B ={{.*}} unnamed_addr alias { [4 x i32] }, { [4 x i32] }* @_ZTV1B.local
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// A::bar() is defined outside of the module that defines the vtable for A
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// CHECK: define{{.*}} void @_ZN1A3barEv(%class.A* {{.*}}%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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// CHECK: define{{.*}} void @_ZN1B3fooEv(%class.B* {{.*}}%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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void A::bar() {}
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void B::foo() {}
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