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[Codegen] - Implement basic .debug_loclists section emission (DWARF5). 

.debug_loclists is the DWARF 5 version of the .debug_loc.
With that patch, it will be emitted when DWARF 5 is used.

Differential revision: https://reviews.llvm.org/D53365

llvm-svn: 345377
This commit is contained in:
George Rimar 2018-10-26 11:25:12 +00:00
parent 84d0051310
commit 088d96b43d
7 changed files with 302 additions and 53 deletions
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3
llvm/include/llvm/MC/MCObjectFileInfo.h
View File

@ -117,6 +117,8 @@ protected:
MCSection *DwarfAddrSection;
/// The DWARF v5 range list section.
MCSection *DwarfRnglistsSection;
/// The DWARF v5 locations list section.
MCSection *DwarfLoclistsSection;
/// The DWARF v5 range list section for fission.
MCSection *DwarfRnglistsDWOSection;
@ -258,6 +260,7 @@ public:
MCSection *getDwarfARangesSection() const { return DwarfARangesSection; }
MCSection *getDwarfRangesSection() const { return DwarfRangesSection; }
MCSection *getDwarfRnglistsSection() const { return DwarfRnglistsSection; }
MCSection *getDwarfLoclistsSection() const { return DwarfLoclistsSection; }
MCSection *getDwarfMacinfoSection() const { return DwarfMacinfoSection; }
MCSection *getDwarfDebugNamesSection() const {

184
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -727,11 +727,16 @@ void DwarfDebug::beginModule() {
(useSplitDwarf() ? SkeletonHolder : InfoHolder)
.setStringOffsetsStartSym(Asm->createTempSymbol("str_offsets_base"));
// Create the symbol that designates the start of the DWARF v5 range list
// table. It is located past the header and before the offsets table.
// Create the symbols that designates the start of the DWARF v5 range list
// and locations list tables. They are located past the table headers.
if (getDwarfVersion() >= 5) {
(useSplitDwarf() ? SkeletonHolder : InfoHolder)
.setRnglistsTableBaseSym(Asm->createTempSymbol("rnglists_table_base"));
DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
Holder.setRnglistsTableBaseSym(
Asm->createTempSymbol("rnglists_table_base"));
Holder.setLoclistsTableBaseSym(
Asm->createTempSymbol("loclists_table_base"));
if (useSplitDwarf())
InfoHolder.setRnglistsTableBaseSym(
Asm->createTempSymbol("rnglists_dwo_table_base"));
@ -889,8 +894,13 @@ void DwarfDebug::finalizeModuleInfo() {
U.attachRangesOrLowHighPC(U.getUnitDie(), TheCU.takeRanges());
}
if (getDwarfVersion() >= 5 && U.hasRangeLists())
U.addRnglistsBase();
if (getDwarfVersion() >= 5) {
if (U.hasRangeLists())
U.addRnglistsBase();
if (!DebugLocs.getLists().empty() && !useSplitDwarf())
U.addLoclistsBase();
}
auto *CUNode = cast<DICompileUnit>(P.first);
// If compile Unit has macros, emit "DW_AT_macro_info" attribute.
@ -1925,25 +1935,119 @@ void DwarfDebug::emitDebugLocEntryLocation(const DebugLocStream::Entry &Entry) {
emitDebugLocEntry(Streamer, Entry);
}
// Emit locations into the debug loc section.
// Emit the common part of the DWARF 5 range/locations list tables header.
static void emitListsTableHeaderStart(AsmPrinter *Asm, const DwarfFile &Holder,
MCSymbol *TableStart,
MCSymbol *TableEnd) {
// Build the table header, which starts with the length field.
Asm->OutStreamer->AddComment("Length");
Asm->EmitLabelDifference(TableEnd, TableStart, 4);
Asm->OutStreamer->EmitLabel(TableStart);
// Version number (DWARF v5 and later).
Asm->OutStreamer->AddComment("Version");
Asm->emitInt16(Asm->OutStreamer->getContext().getDwarfVersion());
// Address size.
Asm->OutStreamer->AddComment("Address size");
Asm->emitInt8(Asm->MAI->getCodePointerSize());
// Segment selector size.
Asm->OutStreamer->AddComment("Segment selector size");
Asm->emitInt8(0);
}
// Emit the header of a DWARF 5 range list table list table. Returns the symbol
// that designates the end of the table for the caller to emit when the table is
// complete.
static MCSymbol *emitRnglistsTableHeader(AsmPrinter *Asm,
const DwarfFile &Holder) {
MCSymbol *TableStart = Asm->createTempSymbol("debug_rnglist_table_start");
MCSymbol *TableEnd = Asm->createTempSymbol("debug_rnglist_table_end");
emitListsTableHeaderStart(Asm, Holder, TableStart, TableEnd);
Asm->OutStreamer->AddComment("Offset entry count");
Asm->emitInt32(Holder.getRangeLists().size());
Asm->OutStreamer->EmitLabel(Holder.getRnglistsTableBaseSym());
for (const RangeSpanList &List : Holder.getRangeLists())
Asm->EmitLabelDifference(List.getSym(), Holder.getRnglistsTableBaseSym(),
4);
return TableEnd;
}
// Emit the header of a DWARF 5 locations list table. Returns the symbol that
// designates the end of the table for the caller to emit when the table is
// complete.
static MCSymbol *emitLoclistsTableHeader(AsmPrinter *Asm,
const DwarfFile &Holder) {
MCSymbol *TableStart = Asm->createTempSymbol("debug_loclist_table_start");
MCSymbol *TableEnd = Asm->createTempSymbol("debug_loclist_table_end");
emitListsTableHeaderStart(Asm, Holder, TableStart, TableEnd);
// FIXME: Generate the offsets table and use DW_FORM_loclistx with the
// DW_AT_loclists_base attribute. Until then set the number of offsets to 0.
Asm->OutStreamer->AddComment("Offset entry count");
Asm->emitInt32(0);
Asm->OutStreamer->EmitLabel(Holder.getLoclistsTableBaseSym());
return TableEnd;
}
// Emit locations into the .debug_loc/.debug_rnglists section.
void DwarfDebug::emitDebugLoc() {
if (DebugLocs.getLists().empty())
return;
// Start the dwarf loc section.
Asm->OutStreamer->SwitchSection(
Asm->getObjFileLowering().getDwarfLocSection());
bool IsLocLists = getDwarfVersion() >= 5;
MCSymbol *TableEnd = nullptr;
if (IsLocLists) {
Asm->OutStreamer->SwitchSection(
Asm->getObjFileLowering().getDwarfLoclistsSection());
TableEnd = emitLoclistsTableHeader(Asm, useSplitDwarf() ? SkeletonHolder
: InfoHolder);
} else {
Asm->OutStreamer->SwitchSection(
Asm->getObjFileLowering().getDwarfLocSection());
}
unsigned char Size = Asm->MAI->getCodePointerSize();
for (const auto &List : DebugLocs.getLists()) {
Asm->OutStreamer->EmitLabel(List.Label);
const DwarfCompileUnit *CU = List.CU;
const MCSymbol *Base = CU->getBaseAddress();
for (const auto &Entry : DebugLocs.getEntries(List)) {
// Set up the range. This range is relative to the entry point of the
// compile unit. This is a hard coded 0 for low_pc when we're emitting
// ranges, or the DW_AT_low_pc on the compile unit otherwise.
if (auto *Base = CU->getBaseAddress()) {
Asm->EmitLabelDifference(Entry.BeginSym, Base, Size);
Asm->EmitLabelDifference(Entry.EndSym, Base, Size);
if (Base) {
// Set up the range. This range is relative to the entry point of the
// compile unit. This is a hard coded 0 for low_pc when we're emitting
// ranges, or the DW_AT_low_pc on the compile unit otherwise.
if (IsLocLists) {
Asm->OutStreamer->AddComment("DW_LLE_offset_pair");
Asm->OutStreamer->EmitIntValue(dwarf::DW_LLE_offset_pair, 1);
Asm->OutStreamer->AddComment(" starting offset");
Asm->EmitLabelDifferenceAsULEB128(Entry.BeginSym, Base);
Asm->OutStreamer->AddComment(" ending offset");
Asm->EmitLabelDifferenceAsULEB128(Entry.EndSym, Base);
} else {
Asm->EmitLabelDifference(Entry.BeginSym, Base, Size);
Asm->EmitLabelDifference(Entry.EndSym, Base, Size);
}
emitDebugLocEntryLocation(Entry);
continue;
}
// We have no base address.
if (IsLocLists) {
// TODO: Use DW_LLE_base_addressx + DW_LLE_offset_pair, or
// DW_LLE_startx_length in case if there is only a single range.
// That should reduce the size of the debug data emited.
// For now just use the DW_LLE_startx_length for all cases.
Asm->OutStreamer->AddComment("DW_LLE_startx_length");
Asm->emitInt8(dwarf::DW_LLE_startx_length);
Asm->OutStreamer->AddComment(" start idx");
Asm->EmitULEB128(AddrPool.getIndex(Entry.BeginSym));
Asm->OutStreamer->AddComment(" length");
Asm->EmitLabelDifferenceAsULEB128(Entry.EndSym, Entry.BeginSym);
} else {
Asm->OutStreamer->EmitSymbolValue(Entry.BeginSym, Size);
Asm->OutStreamer->EmitSymbolValue(Entry.EndSym, Size);
@ -1951,9 +2055,20 @@ void DwarfDebug::emitDebugLoc() {
emitDebugLocEntryLocation(Entry);
}
Asm->OutStreamer->EmitIntValue(0, Size);
Asm->OutStreamer->EmitIntValue(0, Size);
if (IsLocLists) {
// .debug_loclists section ends with DW_LLE_end_of_list.
Asm->OutStreamer->AddComment("DW_LLE_end_of_list");
Asm->OutStreamer->EmitIntValue(dwarf::DW_LLE_end_of_list, 1);
} else {
// Terminate the .debug_loc list with two 0 values.
Asm->OutStreamer->EmitIntValue(0, Size);
Asm->OutStreamer->EmitIntValue(0, Size);
}
}
if (TableEnd)
Asm->OutStreamer->EmitLabel(TableEnd);
}
void DwarfDebug::emitDebugLocDWO() {
@ -2232,39 +2347,6 @@ static void emitRangeList(DwarfDebug &DD, AsmPrinter *Asm,
}
}
// Emit the header of a DWARF 5 range list table. Returns the symbol that
// designates the end of the table for the caller to emit when the table is
// complete.
static MCSymbol *emitRnglistsTableHeader(AsmPrinter *Asm,
const DwarfFile &Holder) {
// The length is described by a starting label right after the length field
// and an end label.
MCSymbol *TableStart = Asm->createTempSymbol("debug_rnglist_table_start");
MCSymbol *TableEnd = Asm->createTempSymbol("debug_rnglist_table_end");
// Build the range table header, which starts with the length field.
Asm->OutStreamer->AddComment("Length");
Asm->EmitLabelDifference(TableEnd, TableStart, 4);
Asm->OutStreamer->EmitLabel(TableStart);
// Version number (DWARF v5 and later).
Asm->OutStreamer->AddComment("Version");
Asm->emitInt16(Asm->OutStreamer->getContext().getDwarfVersion());
Asm->OutStreamer->AddComment("Address size");
Asm->emitInt8(Asm->MAI->getCodePointerSize());
Asm->OutStreamer->AddComment("Segment selector size");
Asm->emitInt8(0);
MCSymbol *RnglistsTableBaseSym = Holder.getRnglistsTableBaseSym();
// FIXME: Generate the offsets table and use DW_FORM_rnglistx with the
// DW_AT_ranges attribute. Until then set the number of offsets to 0.
Asm->OutStreamer->AddComment("Offset entry count");
Asm->emitInt32(Holder.getRangeLists().size());
Asm->OutStreamer->EmitLabel(RnglistsTableBaseSym);
for (const RangeSpanList &List : Holder.getRangeLists())
Asm->EmitLabelDifference(List.getSym(), RnglistsTableBaseSym, 4);
return TableEnd;
}
void emitDebugRangesImpl(DwarfDebug &DD, AsmPrinter *Asm,
const DwarfFile &Holder, MCSymbol *TableEnd) {
for (const RangeSpanList &List : Holder.getRangeLists())

9
llvm/lib/CodeGen/AsmPrinter/DwarfFile.h
View File

@ -89,6 +89,10 @@ class DwarfFile {
/// The table is shared by all units.
MCSymbol *RnglistsTableBaseSym = nullptr;
/// DWARF v5: The symbol that designates the base of the locations list table.
/// The table is shared by all units.
MCSymbol *LoclistsTableBaseSym = nullptr;
/// The variables of a lexical scope.
struct ScopeVars {
/// We need to sort Args by ArgNo and check for duplicates. This could also
@ -161,13 +165,14 @@ public:
DwarfStringPool &getStringPool() { return StrPool; }
MCSymbol *getStringOffsetsStartSym() const { return StringOffsetsStartSym; }
void setStringOffsetsStartSym(MCSymbol *Sym) { StringOffsetsStartSym = Sym; }
MCSymbol *getRnglistsTableBaseSym() const { return RnglistsTableBaseSym; }
void setRnglistsTableBaseSym(MCSymbol *Sym) { RnglistsTableBaseSym = Sym; }
MCSymbol *getLoclistsTableBaseSym() const { return LoclistsTableBaseSym; }
void setLoclistsTableBaseSym(MCSymbol *Sym) { LoclistsTableBaseSym = Sym; }
/// \returns false if the variable was merged with a previous one.
bool addScopeVariable(LexicalScope *LS, DbgVariable *Var);

9
llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
View File

@ -1656,6 +1656,15 @@ void DwarfUnit::addRnglistsBase() {
TLOF.getDwarfRnglistsSection()->getBeginSymbol());
}
void DwarfUnit::addLoclistsBase() {
assert(DD->getDwarfVersion() >= 5 &&
"DW_AT_loclists_base requires DWARF version 5 or later");
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
addSectionLabel(getUnitDie(), dwarf::DW_AT_loclists_base,
DU->getLoclistsTableBaseSym(),
TLOF.getDwarfLoclistsSection()->getBeginSymbol());
}
void DwarfUnit::addAddrTableBase() {
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
MCSymbol *Label = DD->getAddressPool().getLabel();

3
llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h
View File

@ -272,6 +272,9 @@ public:
/// Add the DW_AT_rnglists_base attribute to the unit DIE.
void addRnglistsBase();
/// Add the DW_AT_loclists_base attribute to the unit DIE.
void addLoclistsBase();
/// Add the DW_AT_addr_base attribute to the unit DIE.
void addAddrTableBase();

5
llvm/lib/MC/MCObjectFileInfo.cpp
View File

@ -260,6 +260,10 @@ void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) {
DwarfLocSection =
Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata(), "section_debug_loc");
DwarfLoclistsSection =
Ctx->getMachOSection("__DWARF", "__debug_loclists", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata(), "section_debug_loc");
DwarfARangesSection =
Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
@ -435,6 +439,7 @@ void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) {
Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0);
DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0);
DwarfRnglistsSection = Ctx->getELFSection(".debug_rnglists", DebugSecType, 0);
DwarfLoclistsSection = Ctx->getELFSection(".debug_loclists", DebugSecType, 0);
// Fission Sections
DwarfInfoDWOSection =

142
llvm/test/CodeGen/X86/debug-loclists.ll Normal file
View File

@ -0,0 +1,142 @@
; RUN: llc -mtriple=x86_64-pc-linux -filetype=obj -o %t < %s
; RUN: llvm-dwarfdump -v %t | FileCheck %s
; CHECK: 0x00000033: DW_TAG_formal_parameter [3]
; CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset] (0x0000000c
; CHECK-NEXT: [0x0000000000000000, 0x0000000000000004): DW_OP_breg5 RDI+0
; CHECK-NEXT: [0x0000000000000004, 0x0000000000000012): DW_OP_breg3 RBX+0)
; CHECK-NEXT: DW_AT_name [DW_FORM_strx1] ( indexed (0000000e) string = "a")
; CHECK-NEXT: DW_AT_decl_file [DW_FORM_data1] ("/home/folder{{\\|\/}}test.cc")
; CHECK-NEXT: DW_AT_decl_line [DW_FORM_data1] (6)
; CHECK-NEXT: DW_AT_type [DW_FORM_ref4] (cu + 0x0040 => {0x00000040} "A")
; CHECK: .debug_loclists contents:
; CHECK-NEXT: 0x00000000: locations list header: length = 0x00000017, version = 0x0005, addr_size = 0x08, seg_size = 0x00, offset_entry_count = 0x00000000
; CHECK-NEXT: 0x00000000:
; CHECK-NEXT: [0x0000000000000000, 0x0000000000000004): DW_OP_breg5 RDI+0
; CHECK-NEXT: [0x0000000000000004, 0x0000000000000012): DW_OP_breg3 RBX+0
; There is no way to use llvm-dwarfdump atm (2018, october) to verify the DW_LLE_* codes emited,
; because dumper is not yet implements that. Use asm code to do this check instead.
;
; RUN: llc -mtriple=x86_64-pc-linux -filetype=asm < %s -o - | FileCheck %s --check-prefix=ASM
; ASM: .section .debug_loclists,"",@progbits
; ASM-NEXT: .long .Ldebug_loclist_table_end0-.Ldebug_loclist_table_start0 # Length
; ASM-NEXT: .Ldebug_loclist_table_start0:
; ASM-NEXT: .short 5 # Version
; ASM-NEXT: .byte 8 # Address size
; ASM-NEXT: .byte 0 # Segment selector size
; ASM-NEXT: .long 0 # Offset entry count
; ASM-NEXT: .Lloclists_table_base0:
; ASM-NEXT: .Ldebug_loc0:
; ASM-NEXT: .byte 4 # DW_LLE_offset_pair
; ASM-NEXT: .uleb128 .Lfunc_begin0-.Lfunc_begin0 # starting offset
; ASM-NEXT: .uleb128 .Ltmp0-.Lfunc_begin0 # ending offset
; ASM-NEXT: .short 2 # Loc expr size
; ASM-NEXT: .byte 117 # DW_OP_breg5
; ASM-NEXT: .byte 0 # 0
; ASM-NEXT: .byte 4 # DW_LLE_offset_pair
; ASM-NEXT: .uleb128 .Ltmp0-.Lfunc_begin0 # starting offset
; ASM-NEXT: .uleb128 .Ltmp1-.Lfunc_begin0 # ending offset
; ASM-NEXT: .short 2 # Loc expr size
; ASM-NEXT: .byte 115 # DW_OP_breg3
; ASM-NEXT: .byte 0 # 0
; ASM-NEXT: .byte 0 # DW_LLE_end_of_list
; ASM-NEXT: .Ldebug_loclist_table_end0:
; ModuleID = 'test.cc'
source_filename = "test.cc"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%struct.A = type { i32 (...)** }
@_ZTV1A = dso_local unnamed_addr constant { [4 x i8*] } { [4 x i8*] [i8* null, i8* bitcast ({ i8*, i8* }* @_ZTI1A to i8*), i8* bitcast (void (%struct.A*)* @_ZN1A3fooEv to i8*), i8* bitcast (void (%struct.A*)* @_ZN1A3barEv to i8*)] }, align 8
@_ZTVN10__cxxabiv117__class_type_infoE = external dso_local global i8*
@_ZTS1A = dso_local constant [3 x i8] c"1A\00", align 1
@_ZTI1A = dso_local constant { i8*, i8* } { i8* bitcast (i8** getelementptr inbounds (i8*, i8** @_ZTVN10__cxxabiv117__class_type_infoE, i64 2) to i8*), i8* getelementptr inbounds ([3 x i8], [3 x i8]* @_ZTS1A, i32 0, i32 0) }, align 8
; Function Attrs: noinline optnone uwtable
define dso_local void @_Z3baz1A(%struct.A* %a) #0 !dbg !7 {
entry:
call void @llvm.dbg.declare(metadata %struct.A* %a, metadata !23, metadata !DIExpression()), !dbg !24
call void @_ZN1A3fooEv(%struct.A* %a), !dbg !25
call void @_ZN1A3barEv(%struct.A* %a), !dbg !26
ret void, !dbg !27
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
; Function Attrs: noinline nounwind optnone uwtable
define dso_local void @_ZN1A3fooEv(%struct.A* %this) unnamed_addr #2 align 2 !dbg !28 {
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 !29, metadata !DIExpression()), !dbg !31
%this1 = load %struct.A*, %struct.A** %this.addr, align 8
ret void, !dbg !32
}
; Function Attrs: noinline nounwind optnone uwtable
define dso_local void @_ZN1A3barEv(%struct.A* %this) unnamed_addr #2 align 2 !dbg !33 {
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 !34, metadata !DIExpression()), !dbg !35
%this1 = load %struct.A*, %struct.A** %this.addr, align 8
ret void, !dbg !36
}
; Function Attrs: noinline norecurse nounwind optnone uwtable
define dso_local i32 @main() #3 !dbg !37 {
entry:
%retval = alloca i32, align 4
store i32 0, i32* %retval, align 4
ret i32 0, !dbg !38
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 8.0.0 (trunk 344035)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
!1 = !DIFile(filename: "test.cc", directory: "/home/folder", checksumkind: CSK_MD5, checksum: "e0f357ad6dcb791a774a0dae55baf5e7")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 5}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang version 8.0.0 (trunk 344035)"}
!7 = distinct !DISubprogram(name: "baz", linkageName: "_Z3baz1A", scope: !1, file: !1, line: 6, type: !8, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{null, !10}
!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "A", file: !1, line: 1, size: 64, flags: DIFlagTypePassByReference, elements: !11, vtableHolder: !10, identifier: "_ZTS1A")
!11 = !{!12, !18, !22}
!12 = !DIDerivedType(tag: DW_TAG_member, name: "_vptr$A", scope: !1, file: !1, baseType: !13, size: 64, flags: DIFlagArtificial)
!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)
!14 = !DIDerivedType(tag: DW_TAG_pointer_type, name: "__vtbl_ptr_type", baseType: !15, size: 64)
!15 = !DISubroutineType(types: !16)
!16 = !{!17}
!17 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!18 = !DISubprogram(name: "foo", linkageName: "_ZN1A3fooEv", scope: !10, file: !1, line: 2, type: !19, isLocal: false, isDefinition: false, scopeLine: 2, containingType: !10, virtuality: DW_VIRTUALITY_virtual, virtualIndex: 0, flags: DIFlagPrototyped, isOptimized: false)
!19 = !DISubroutineType(types: !20)
!20 = !{null, !21}
!21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
!22 = !DISubprogram(name: "bar", linkageName: "_ZN1A3barEv", scope: !10, file: !1, line: 3, type: !19, isLocal: false, isDefinition: false, scopeLine: 3, containingType: !10, virtuality: DW_VIRTUALITY_virtual, virtualIndex: 1, flags: DIFlagPrototyped, isOptimized: false)
!23 = !DILocalVariable(name: "a", arg: 1, scope: !7, file: !1, line: 6, type: !10)
!24 = !DILocation(line: 6, column: 19, scope: !7)
!25 = !DILocation(line: 7, column: 6, scope: !7)
!26 = !DILocation(line: 8, column: 6, scope: !7)
!27 = !DILocation(line: 9, column: 1, scope: !7)
!28 = distinct !DISubprogram(name: "foo", linkageName: "_ZN1A3fooEv", scope: !10, file: !1, line: 12, type: !19, isLocal: false, isDefinition: true, scopeLine: 12, flags: DIFlagPrototyped, isOptimized: false, unit: !0, declaration: !18, retainedNodes: !2)
!29 = !DILocalVariable(name: "this", arg: 1, scope: !28, type: !30, flags: DIFlagArtificial | DIFlagObjectPointer)
!30 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
!31 = !DILocation(line: 0, scope: !28)
!32 = !DILocation(line: 12, column: 16, scope: !28)
!33 = distinct !DISubprogram(name: "bar", linkageName: "_ZN1A3barEv", scope: !10, file: !1, line: 13, type: !19, isLocal: false, isDefinition: true, scopeLine: 13, flags: DIFlagPrototyped, isOptimized: false, unit: !0, declaration: !22, retainedNodes: !2)
!34 = !DILocalVariable(name: "this", arg: 1, scope: !33, type: !30, flags: DIFlagArtificial | DIFlagObjectPointer)
!35 = !DILocation(line: 0, scope: !33)
!36 = !DILocation(line: 13, column: 16, scope: !33)
!37 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 15, type: !15, isLocal: false, isDefinition: true, scopeLine: 15, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
!38 = !DILocation(line: 16, column: 3, scope: !37)