From 515f2f96114b8279651c711079d16d6530110de1 Mon Sep 17 00:00:00 2001 From: Adrian Prantl Date: Sat, 12 Apr 2014 01:44:42 +0000 Subject: [PATCH] Debug info: (bugfix) C++ C/Dtors can be compiled to multiple functions, therefore, their declaration cannot have one DW_AT_linkage_name. The specific instances however can and should have that attribute. This patch reorders the code in DwarfUnit::getOrCreateSubprogramDIE() to emit linkage names for C/Dtors. rdar://problem/16362674. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206096 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/AsmPrinter/DwarfUnit.cpp | 23 +++-- test/DebugInfo/X86/DW_AT_linkage_name.ll | 103 +++++++++++++++++++++ test/DebugInfo/X86/concrete_out_of_line.ll | 1 + 3 files changed, 118 insertions(+), 9 deletions(-) create mode 100644 test/DebugInfo/X86/DW_AT_linkage_name.ll diff --git a/lib/CodeGen/AsmPrinter/DwarfUnit.cpp b/lib/CodeGen/AsmPrinter/DwarfUnit.cpp index 82e9bb008a0..2302abef31d 100644 --- a/lib/CodeGen/AsmPrinter/DwarfUnit.cpp +++ b/lib/CodeGen/AsmPrinter/DwarfUnit.cpp @@ -1467,20 +1467,25 @@ DIE *DwarfUnit::getOrCreateSubprogramDIE(DISubprogram SP) { // Add function template parameters. addTemplateParams(*SPDie, SP.getTemplateParams()); - // If this DIE is going to refer declaration info using AT_specification - // then there is no need to add other attributes. - if (DeclDie) { + if (DeclDie) // Refer function declaration directly. addDIEEntry(SPDie, dwarf::DW_AT_specification, DeclDie); - return SPDie; + // Add the linkage name if we have one and it isn't in the Decl. + StringRef LinkageName = SP.getLinkageName(); + if (!LinkageName.empty()) { + if (SPDecl.isSubprogram() && !SPDecl.getLinkageName().empty()) + assert(SPDecl.getLinkageName() == SP.getLinkageName() && + "decl has a linkage name and it is different"); + else + addString(SPDie, dwarf::DW_AT_MIPS_linkage_name, + GlobalValue::getRealLinkageName(LinkageName)); } - // Add the linkage name if we have one. - StringRef LinkageName = SP.getLinkageName(); - if (!LinkageName.empty()) - addString(SPDie, dwarf::DW_AT_MIPS_linkage_name, - GlobalValue::getRealLinkageName(LinkageName)); + // If this DIE is going to refer declaration info using AT_specification + // then there is no need to add other attributes. + if (DeclDie) + return SPDie; // Constructors and operators for anonymous aggregates do not have names. if (!SP.getName().empty()) diff --git a/test/DebugInfo/X86/DW_AT_linkage_name.ll b/test/DebugInfo/X86/DW_AT_linkage_name.ll new file mode 100644 index 00000000000..4bcd050be60 --- /dev/null +++ b/test/DebugInfo/X86/DW_AT_linkage_name.ll @@ -0,0 +1,103 @@ +; RUN: llc -mtriple=x86_64-apple-macosx %s -o %t -filetype=obj +; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s + +; rdar://problem/16362674 + +; Test that we do not emit a linkage name for the declaration of a destructor. +; Test that we do emit a linkage name for a specific instance of it. + +; CHECK: DW_TAG_subprogram +; CHECK: [[A:.*]]: DW_TAG_subprogram +; CHECK: DW_AT_name {{.*}} "~A" +; CHECK-NOT: DW_AT_MIPS_linkage_name +; CHECK: DW_TAG_subprogram +; CHECK-NEXT: DW_AT_specification {{.*}}[[A]] +; CHECK-NEXT: DW_AT_MIPS_linkage_name {{.*}} "_ZN1AD2Ev" + + +target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-apple-macosx10.9.0" + +%struct.A = type { i8 } + +; Function Attrs: nounwind ssp uwtable +define void @_ZN1AD2Ev(%struct.A* %this) unnamed_addr #0 align 2 { +entry: + %this.addr = alloca %struct.A*, align 8 + store %struct.A* %this, %struct.A** %this.addr, align 8 + call void @llvm.dbg.declare(metadata !{%struct.A** %this.addr}, metadata !26), !dbg !28 + %this1 = load %struct.A** %this.addr + ret void, !dbg !29 +} + +; Function Attrs: nounwind readnone +declare void @llvm.dbg.declare(metadata, metadata) #1 + +; Function Attrs: nounwind ssp uwtable +define void @_ZN1AD1Ev(%struct.A* %this) unnamed_addr #0 align 2 { +entry: + %this.addr = alloca %struct.A*, align 8 + store %struct.A* %this, %struct.A** %this.addr, align 8 + call void @llvm.dbg.declare(metadata !{%struct.A** %this.addr}, metadata !30), !dbg !31 + %this1 = load %struct.A** %this.addr + call void @_ZN1AD2Ev(%struct.A* %this1), !dbg !32 + ret void, !dbg !33 +} + +; Function Attrs: ssp uwtable +define void @_Z3foov() #2 { +entry: + %a = alloca %struct.A, align 1 + call void @llvm.dbg.declare(metadata !{%struct.A* %a}, metadata !34), !dbg !35 + call void @_ZN1AC1Ei(%struct.A* %a, i32 1), !dbg !35 + call void @_ZN1AD1Ev(%struct.A* %a), !dbg !36 + ret void, !dbg !36 +} + +declare void @_ZN1AC1Ei(%struct.A*, i32) + +attributes #0 = { nounwind ssp uwtable } +attributes #1 = { nounwind readnone } +attributes #2 = { ssp uwtable } + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!23, !24} +!llvm.ident = !{!25} + +!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5.0 ", i1 false, metadata !"", i32 0, metadata !2, metadata !3, metadata !16, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [linkage-name.cpp] [DW_LANG_C_plus_plus] +!1 = metadata !{metadata !"linkage-name.cpp", metadata !""} +!2 = metadata !{} +!3 = metadata !{metadata !4} +!4 = metadata !{i32 786451, metadata !1, null, metadata !"A", i32 1, i64 8, i64 8, i32 0, i32 0, null, metadata !5, i32 0, null, null, metadata !"_ZTS1A"} ; [ DW_TAG_structure_type ] [A] [line 1, size 8, align 8, offset 0] [def] [from ] +!5 = metadata !{metadata !6, metadata !12} +!6 = metadata !{i32 786478, metadata !1, metadata !"_ZTS1A", metadata !"A", metadata !"A", metadata !"", i32 2, metadata !7, i1 false, i1 false, i32 0, i32 0, null, i32 256, i1 false, null, null, i32 0, metadata !11, i32 2} ; [ DW_TAG_subprogram ] [line 2] [A] +!7 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !8, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ] +!8 = metadata !{null, metadata !9, metadata !10} +!9 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 1088, metadata !"_ZTS1A"} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [artificial] [from _ZTS1A] +!10 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed] +!11 = metadata !{i32 786468} +!12 = metadata !{i32 786478, metadata !1, metadata !"_ZTS1A", metadata !"~A", metadata !"~A", metadata !"", i32 3, metadata !13, i1 false, i1 false, i32 0, i32 0, null, i32 256, i1 false, null, null, i32 0, metadata !15, i32 3} ; [ DW_TAG_subprogram ] [line 3] [~A] +!13 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !14, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ] +!14 = metadata !{null, metadata !9} +!15 = metadata !{i32 786468} +!16 = metadata !{metadata !17, metadata !18, metadata !19} +!17 = metadata !{i32 786478, metadata !1, metadata !"_ZTS1A", metadata !"~A", metadata !"~A", metadata !"_ZN1AD2Ev", i32 6, metadata !13, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (%struct.A*)* @_ZN1AD2Ev, null, metadata !12, metadata !2, i32 6} ; [ DW_TAG_subprogram ] [line 6] [def] [~A] +!18 = metadata !{i32 786478, metadata !1, metadata !"_ZTS1A", metadata !"~A", metadata !"~A", metadata !"_ZN1AD1Ev", i32 6, metadata !13, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (%struct.A*)* @_ZN1AD1Ev, null, metadata !12, metadata !2, i32 6} ; [ DW_TAG_subprogram ] [line 6] [def] [~A] +!19 = metadata !{i32 786478, metadata !1, metadata !20, metadata !"foo", metadata !"foo", metadata !"_Z3foov", i32 10, metadata !21, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void ()* @_Z3foov, null, null, metadata !2, i32 10} ; [ DW_TAG_subprogram ] [line 10] [def] [foo] +!20 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [linkage-name.cpp] +!21 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !22, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ] +!22 = metadata !{null} +!23 = metadata !{i32 2, metadata !"Dwarf Version", i32 2} +!24 = metadata !{i32 1, metadata !"Debug Info Version", i32 1} +!25 = metadata !{metadata !"clang version 3.5.0 "} +!26 = metadata !{i32 786689, metadata !17, metadata !"this", null, i32 16777216, metadata !27, i32 1088, i32 0} ; [ DW_TAG_arg_variable ] [this] [line 0] +!27 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !"_ZTS1A"} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from _ZTS1A] +!28 = metadata !{i32 0, i32 0, metadata !17, null} +!29 = metadata !{i32 8, i32 0, metadata !17, null} ; [ DW_TAG_imported_declaration ] +!30 = metadata !{i32 786689, metadata !18, metadata !"this", null, i32 16777216, metadata !27, i32 1088, i32 0} ; [ DW_TAG_arg_variable ] [this] [line 0] +!31 = metadata !{i32 0, i32 0, metadata !18, null} +!32 = metadata !{i32 6, i32 0, metadata !18, null} +!33 = metadata !{i32 8, i32 0, metadata !18, null} ; [ DW_TAG_imported_declaration ] +!34 = metadata !{i32 786688, metadata !19, metadata !"a", metadata !20, i32 11, metadata !"_ZTS1A", i32 0, i32 0} ; [ DW_TAG_auto_variable ] [a] [line 11] +!35 = metadata !{i32 11, i32 0, metadata !19, null} +!36 = metadata !{i32 12, i32 0, metadata !19, null} diff --git a/test/DebugInfo/X86/concrete_out_of_line.ll b/test/DebugInfo/X86/concrete_out_of_line.ll index 2f5a7d11eb3..7672ce6771b 100644 --- a/test/DebugInfo/X86/concrete_out_of_line.ll +++ b/test/DebugInfo/X86/concrete_out_of_line.ll @@ -14,6 +14,7 @@ ; CHECK: [[DTOR_OOL:0x........]]: DW_TAG_subprogram ; CHECK-NEXT: DW_AT_specification {{.*}} {[[DTOR_DECL]]}) +; CHECK-NEXT: DW_AT_{{.*}}linkage_name ; CHECK-NEXT: DW_AT_inline -- 2.34.1