96 lines
3.8 KiB
LLVM
96 lines
3.8 KiB
LLVM
; REQUIRES: x86
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; RUN: rm -rf %t; split-file %s %t
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;; Split-LTO bitcode files can have the same symbol (typeinfo) twice in the
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;; symbol table: First undefined in the main file, then defined in the index
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;; file.
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;; When used in --start-lib / --end-lib, ld64.lld creates lazy symbols
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;; for all non-undefined symbols in the bitcode file.
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;; In vtable.o below, the typeinfo __ZTI1S is present once as undefined and
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;; once as defined. The defined version is added as a added as a LazyObject
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;; symbol.
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;; When vtable.o gets loaded due to the __ZN1SC1Ev ref from vtable_use.o,
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;; the first __ZTI1S (undefined) used to cause vtable.o to be extracted
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;; a second time, which used to cause an assert.
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;; See PR59162 for details.
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; RUN: opt --thinlto-bc --thinlto-split-lto-unit -o %t/vtable.o %t/vtable.ll
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; RUN: opt --thinlto-bc --thinlto-split-lto-unit -o %t/vtable_use.o %t/vtable_use.ll
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; RUN: %lld -lc++ --start-lib %t/vtable.o --end-lib %t/vtable_use.o -o /dev/null
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;; Bitcode files created by:
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; % cat vtable.cc
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; struct S {
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; S();
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; virtual void f();
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; };
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; S::S() {}
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; void S::f() {}
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; % cat vtable_use.cc
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; struct S {
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; S();
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; virtual void f();
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; };
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; int main() { S s; }
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; % clang -c vtable_use.cc vtable.cc -emit-llvm -S -fno-exceptions -arch x86_64 -mmacos-version-min=11 -O1
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; ...and then manually adding `, !type !8, type !9` based on `clang -S -emit-llvm -flto=thin` output,
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; because splitAndWriteThinLTOBitcode() in ThinLTOBitcodeWriter.cpp only splits bitcode
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; if type annotations are present. While at it, also removed unnecessary metadata.
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; (NB: The first comment creates vtable.ll while the latter generates vtable.s! vtable.s
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; contains a few things opt complains about, so we can't use the output of that directly.)
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;--- vtable.ll
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; ModuleID = 'vtable.cc'
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source_filename = "vtable.cc"
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target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx11.0.0"
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@_ZTV1S = unnamed_addr constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr @_ZTI1S, ptr @_ZN1S1fEv] }, align 8
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@_ZTVN10__cxxabiv117__class_type_infoE = external global ptr
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@_ZTS1S = constant [3 x i8] c"1S\00", align 1
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@_ZTI1S = constant { ptr, ptr } { ptr getelementptr inbounds (ptr, ptr @_ZTVN10__cxxabiv117__class_type_infoE, i64 2), ptr @_ZTS1S }, align 8, !type !0, !type !1
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; Function Attrs: mustprogress nofree norecurse nosync nounwind ssp willreturn memory(argmem: write) uwtable
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define void @_ZN1SC2Ev(ptr nocapture noundef nonnull writeonly align 8 dereferenceable(8) %this) unnamed_addr align 2 {
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entry:
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store ptr getelementptr inbounds ({ [3 x ptr] }, ptr @_ZTV1S, i64 0, inrange i32 0, i64 2), ptr %this, align 8
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ret void
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}
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; Function Attrs: mustprogress nofree norecurse nosync nounwind ssp willreturn memory(argmem: write) uwtable
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define void @_ZN1SC1Ev(ptr nocapture noundef nonnull writeonly align 8 dereferenceable(8) %this) unnamed_addr align 2 {
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entry:
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store ptr getelementptr inbounds ({ [3 x ptr] }, ptr @_ZTV1S, i64 0, inrange i32 0, i64 2), ptr %this, align 8
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ret void
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}
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; Function Attrs: mustprogress nofree norecurse nosync nounwind ssp willreturn memory(none) uwtable
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define void @_ZN1S1fEv(ptr nocapture nonnull align 8 %this) unnamed_addr align 2 {
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entry:
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ret void
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}
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!0 = !{i64 16, !"_ZTS1S"}
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!1 = !{i64 16, !"_ZTSM1SFvvE.virtual"}
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;--- vtable_use.ll
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; ModuleID = 'vtable_use.cc'
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source_filename = "vtable_use.cc"
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target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx11.0.0"
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%struct.S = type { ptr }
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; Function Attrs: mustprogress noinline norecurse nounwind optnone ssp uwtable
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define noundef i32 @main() {
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entry:
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%s = alloca %struct.S, align 8
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call void @_ZN1SC1Ev(ptr noundef nonnull align 8 dereferenceable(8) %s)
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ret i32 0
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}
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declare void @_ZN1SC1Ev(ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr
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