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Linker: Remove unnecessary call to copyMetadata in IRLinker::linkGlobalVariable.

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This was causing us to create duplicate metadata on global variables.
Debug info test case by Adrian Prantl, additional test cases by me.

Fixes PR31012.

Differential Revision: https://reviews.llvm.org/D26622

llvm-svn: 286905
This commit is contained in:
Peter Collingbourne 2016-11-14 23:18:38 +00:00
parent 4b2c826ea2
commit 1085bb25fe
4 changed files with 76 additions and 6 deletions
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2
lib/Linker/IRMover.cpp
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@ -950,8 +950,6 @@ Expected<Constant *> IRLinker::linkGlobalValueProto(GlobalValue *SGV,
/// Update the initializers in the Dest module now that all globals that may be
/// referenced are in Dest.
void IRLinker::linkGlobalVariable(GlobalVariable &Dst, GlobalVariable &Src) {
Dst.copyMetadata(&Src, 0);
// Figure out what the initializer looks like in the dest module.
Mapper.scheduleMapGlobalInitializer(Dst, *Src.getInitializer());
}

19
test/Linker/Inputs/metadata-attach.ll Normal file
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@ -0,0 +1,19 @@
@g1 = external global i32, !attach !0
@g2 = global i32 1, !attach !0
@g3 = global i32 2, !attach !0
declare !attach !0 void @f1()
define void @f2() !attach !0 {
call void @f1()
store i32 0, i32* @g1
ret void
}
define void @f3() !attach !0 {
ret void
}
!0 = !{i32 1}

23
test/Linker/debug-info-global-var.ll Normal file
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@ -0,0 +1,23 @@
; RUN: llvm-link -S %s %S/debug-info-version-a.ll | FileCheck %s
source_filename = "debug-info-global-var.c"
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.12.0"
; CHECK: @g = global i32 0, align 4, !dbg ![[G:[0-9]+]]{{$}}
@g = global i32 0, align 4, !dbg !0
!llvm.dbg.cu = !{!1}
!llvm.module.flags = !{!6, !7, !8}
!llvm.ident = !{!9}
; CHECK: ![[G]] = distinct !DIGlobalVariable(name: "g"
!0 = distinct !DIGlobalVariable(name: "g", scope: !1, file: !2, line: 1, type: !5, isLocal: false, isDefinition: true)
!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !3, globals: !4)
!2 = !DIFile(filename: "debug-info-global-var.c", directory: "/")
!3 = !{}
!4 = !{!0}
!5 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!6 = !{i32 2, !"Dwarf Version", i32 4}
!7 = !{i32 2, !"Debug Info Version", i32 3}
!8 = !{i32 1, !"PIC Level", i32 2}
!9 = !{!"clang version 4.0.0 (trunk 286129) (llvm/trunk 286128)"}

38
test/Linker/metadata-attach.ll
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@ -1,12 +1,25 @@
; RUN: llvm-link %s -S -o - | FileCheck %s
; RUN: llvm-link %s %S/Inputs/metadata-attach.ll -S -o - | FileCheck --check-prefix=CHECK-LINKED1 %s
; RUN: llvm-link %S/Inputs/metadata-attach.ll %s -S -o - | FileCheck --check-prefix=CHECK-LINKED2 %s
; CHECK: @g1 = global i32 0, !attach !0
; CHECK: @g1 = global i32 0, !attach !0{{$}}
; CHECK-LINKED1: @g1 = global i32 0, !attach !0{{$}}
@g1 = global i32 0, !attach !0
; CHECK: @g2 = external global i32, !attach !0
; CHECK: @g3 = weak global i32 1, !attach !0{{$}}
; CHECK: @g2 = external global i32, !attach !0{{$}}
; CHECK-LINKED1: @g2 = global i32 1, !attach !1{{$}}
@g2 = external global i32, !attach !0
; CHECK: define void @f1() !attach !0
; CHECK-LINKED1: @g3 = global i32 2, !attach !1{{$}}
@g3 = weak global i32 1, !attach !0
; CHECK-LINKED2: @g2 = global i32 1, !attach !0{{$}}
; CHECK-LINKED2: @g3 = global i32 2, !attach !0{{$}}
; CHECK-LINKED2: @g1 = global i32 0, !attach !1{{$}}
; CHECK: define void @f1() !attach !0 {
; CHECK-LINKED1: define void @f1() !attach !0 {
define void @f1() !attach !0 {
call void @f2()
store i32 0, i32* @g2
@ -14,6 +27,23 @@ define void @f1() !attach !0 {
}
; CHECK: declare !attach !0 void @f2()
; CHECK-LINKED1: define void @f2() !attach !1 {
declare !attach !0 void @f2()
!0 = !{}
; CHECK: define weak void @f3() !attach !0 {
; CHECK-LINKED1: define void @f3() !attach !1 {
define weak void @f3() !attach !0 {
ret void
}
; CHECK-LINKED2: define void @f2() !attach !0 {
; CHECK-LINKED2: define void @f3() !attach !0 {
; CHECK-LINKED2: define void @f1() !attach !1 {
; CHECK-LINKED1: !0 = !{i32 0}
; CHECK-LINKED1: !1 = !{i32 1}
; CHECK-LINKED2: !0 = !{i32 1}
; CHECK-LINKED2: !1 = !{i32 0}
!0 = !{i32 0}