[llvm] r259217 - [codeview] Begin to add support for inlined call sites
Reid Kleckner via llvm-commits
llvm-commits at lists.llvm.org
Fri Jan 29 10:16:43 PST 2016
Author: rnk
Date: Fri Jan 29 12:16:43 2016
New Revision: 259217
URL: http://llvm.org/viewvc/llvm-project?rev=259217&view=rev
Log:
[codeview] Begin to add support for inlined call sites
Summary:
There are three parts to inlined call frames:
1. The inlinee line subsection
2. The inline site symbol record
3. The function ids referenced by both
This change starts by emitting function ids (3) for all subprograms and
emitting the base inline site symbol record (2). The actual line numbers
in (2) use an encoded format that will come next, along with the inlinee
line subsection.
Reviewers: majnemer
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D16333
Added:
llvm/trunk/test/DebugInfo/COFF/inlining.ll
Modified:
llvm/trunk/include/llvm/MC/MCObjectFileInfo.h
llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.h
llvm/trunk/lib/MC/MCObjectFileInfo.cpp
Modified: llvm/trunk/include/llvm/MC/MCObjectFileInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/MC/MCObjectFileInfo.h?rev=259217&r1=259216&r2=259217&view=diff
==============================================================================
--- llvm/trunk/include/llvm/MC/MCObjectFileInfo.h (original)
+++ llvm/trunk/include/llvm/MC/MCObjectFileInfo.h Fri Jan 29 12:16:43 2016
@@ -127,6 +127,7 @@ protected:
MCSection *DwarfGnuPubTypesSection;
MCSection *COFFDebugSymbolsSection;
+ MCSection *COFFDebugTypesSection;
/// Extra TLS Variable Data section.
///
@@ -274,6 +275,10 @@ public:
MCSection *getCOFFDebugSymbolsSection() const {
return COFFDebugSymbolsSection;
}
+ MCSection *getCOFFDebugTypesSection() const {
+ return COFFDebugTypesSection;
+ }
+
MCSection *getTLSExtraDataSection() const { return TLSExtraDataSection; }
const MCSection *getTLSDataSection() const { return TLSDataSection; }
Modified: llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp?rev=259217&r1=259216&r2=259217&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp (original)
+++ llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp Fri Jan 29 12:16:43 2016
@@ -15,6 +15,8 @@
#include "llvm/DebugInfo/CodeView/CodeView.h"
#include "llvm/DebugInfo/CodeView/Line.h"
#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
+#include "llvm/DebugInfo/CodeView/TypeIndex.h"
+#include "llvm/DebugInfo/CodeView/TypeRecord.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/COFF.h"
@@ -87,6 +89,17 @@ unsigned CodeViewDebug::maybeRecordFile(
return Insertion.first->second;
}
+CodeViewDebug::InlineSite &CodeViewDebug::getInlineSite(const DILocation *Loc) {
+ const DILocation *InlinedAt = Loc->getInlinedAt();
+ auto Insertion = CurFn->InlineSites.insert({InlinedAt, InlineSite()});
+ if (Insertion.second) {
+ InlineSite &Site = Insertion.first->second;
+ Site.SiteFuncId = NextFuncId++;
+ Site.Inlinee = Loc->getScope()->getSubprogram();
+ }
+ return Insertion.first->second;
+}
+
void CodeViewDebug::maybeRecordLocation(DebugLoc DL,
const MachineFunction *MF) {
// Skip this instruction if it has the same location as the previous one.
@@ -115,7 +128,28 @@ void CodeViewDebug::maybeRecordLocation(
else
FileId = CurFn->LastFileId = maybeRecordFile(DL->getFile());
CurFn->LastLoc = DL;
- Asm->OutStreamer->EmitCVLocDirective(CurFn->FuncId, FileId, DL.getLine(),
+
+ unsigned FuncId = CurFn->FuncId;
+ if (const DILocation *Loc = DL->getInlinedAt()) {
+ // If this location was actually inlined from somewhere else, give it the ID
+ // of the inline call site.
+ FuncId = getInlineSite(DL.get()).SiteFuncId;
+ // Ensure we have links in the tree of inline call sites.
+ const DILocation *ChildLoc = nullptr;
+ while (Loc->getInlinedAt()) {
+ InlineSite &Site = getInlineSite(Loc);
+ if (ChildLoc) {
+ // Record the child inline site if not already present.
+ auto B = Site.ChildSites.begin(), E = Site.ChildSites.end();
+ if (std::find(B, E, Loc) != E)
+ break;
+ Site.ChildSites.push_back(Loc);
+ }
+ ChildLoc = Loc;
+ }
+ }
+
+ Asm->OutStreamer->EmitCVLocDirective(FuncId, FileId, DL.getLine(),
DL.getCol(), /*PrologueEnd=*/false,
/*IsStmt=*/false, DL->getFilename());
}
@@ -139,6 +173,8 @@ void CodeViewDebug::endModule() {
if (FnDebugInfo.empty())
return;
+ emitTypeInformation();
+
// FIXME: For functions that are comdat, we should emit separate .debug$S
// sections that are comdat associative with the main function instead of
// having one big .debug$S section.
@@ -167,6 +203,60 @@ void CodeViewDebug::endModule() {
clear();
}
+template <typename T> static void emitRecord(MCStreamer &OS, const T &Rec) {
+ OS.EmitBytes(StringRef(reinterpret_cast<const char *>(&Rec), sizeof(Rec)));
+}
+
+void CodeViewDebug::emitTypeInformation() {
+ // Start the .debug$T section with 0x4.
+ Asm->OutStreamer->SwitchSection(
+ Asm->getObjFileLowering().getCOFFDebugTypesSection());
+ Asm->EmitInt32(COFF::DEBUG_SECTION_MAGIC);
+
+ NamedMDNode *CU_Nodes =
+ Asm->MMI->getModule()->getNamedMetadata("llvm.dbg.cu");
+ if (!CU_Nodes)
+ return;
+
+ // This type info currently only holds function ids for use with inline call
+ // frame info. All functions are assigned a simple 'void ()' type. Emit that
+ // type here.
+ TypeIndex ArgListIdx = getNextTypeIndex();
+ Asm->EmitInt16(2 + sizeof(ArgList));
+ Asm->EmitInt16(LF_ARGLIST);
+ Asm->EmitInt32(0);
+
+ TypeIndex VoidProcIdx = getNextTypeIndex();
+ Asm->EmitInt16(2 + sizeof(ProcedureType));
+ Asm->EmitInt16(LF_PROCEDURE);
+ ProcedureType Proc{}; // Zero initialize.
+ Proc.ReturnType = TypeIndex::Void();
+ Proc.CallConv = CallingConvention::NearC;
+ Proc.Options = FunctionOptions::None;
+ Proc.NumParameters = 0;
+ Proc.ArgListType = ArgListIdx;
+ emitRecord(*Asm->OutStreamer, Proc);
+
+ for (MDNode *N : CU_Nodes->operands()) {
+ auto *CUNode = cast<DICompileUnit>(N);
+ for (auto *SP : CUNode->getSubprograms()) {
+ StringRef DisplayName = SP->getDisplayName();
+ Asm->EmitInt16(2 + sizeof(FuncId) + DisplayName.size() + 1);
+ Asm->EmitInt16(LF_FUNC_ID);
+
+ FuncId Func{}; // Zero initialize.
+ Func.ParentScope = TypeIndex();
+ Func.FunctionType = VoidProcIdx;
+ emitRecord(*Asm->OutStreamer, Func);
+ Asm->OutStreamer->EmitBytes(DisplayName);
+ Asm->EmitInt8(0);
+
+ TypeIndex FuncIdIdx = getNextTypeIndex();
+ SubprogramToFuncId.insert(std::make_pair(SP, FuncIdIdx));
+ }
+ }
+}
+
static void EmitLabelDiff(MCStreamer &Streamer,
const MCSymbol *From, const MCSymbol *To,
unsigned int Size = 4) {
@@ -179,6 +269,44 @@ static void EmitLabelDiff(MCStreamer &St
Streamer.EmitValue(AddrDelta, Size);
}
+void CodeViewDebug::emitInlinedCallSite(const FunctionInfo &FI,
+ const DILocation *InlinedAt,
+ const InlineSite &Site) {
+ MCStreamer &OS = *Asm->OutStreamer;
+
+ MCSymbol *InlineBegin = Asm->MMI->getContext().createTempSymbol(),
+ *InlineEnd = Asm->MMI->getContext().createTempSymbol();
+
+ assert(SubprogramToFuncId.count(Site.Inlinee));
+ TypeIndex InlineeIdx = SubprogramToFuncId[Site.Inlinee];
+
+ // SymbolRecord
+ EmitLabelDiff(OS, InlineBegin, InlineEnd, 2); // RecordLength
+ OS.EmitLabel(InlineBegin);
+ Asm->EmitInt16(SymbolRecordKind::S_INLINESITE); // RecordKind
+
+ InlineSiteSym SiteBytes{};
+ SiteBytes.Inlinee = InlineeIdx;
+ Asm->OutStreamer->EmitBytes(
+ StringRef(reinterpret_cast<const char *>(&SiteBytes), sizeof(SiteBytes)));
+
+ // FIXME: annotations
+
+ OS.EmitLabel(InlineEnd);
+
+ // Recurse on child inlined call sites before closing the scope.
+ for (const DILocation *ChildSite : Site.ChildSites) {
+ auto I = FI.InlineSites.find(ChildSite);
+ assert(I != FI.InlineSites.end() &&
+ "child site not in function inline site map");
+ emitInlinedCallSite(FI, ChildSite, I->second);
+ }
+
+ // Close the scope.
+ Asm->EmitInt16(2); // RecordLength
+ Asm->EmitInt16(SymbolRecordKind::S_INLINESITE_END); // RecordKind
+}
+
void CodeViewDebug::emitDebugInfoForFunction(const Function *GV,
FunctionInfo &FI) {
// For each function there is a separate subsection
@@ -224,6 +352,15 @@ void CodeViewDebug::emitDebugInfoForFunc
Asm->EmitInt8(0);
Asm->OutStreamer->EmitLabel(ProcSegmentEnd);
+ // Emit inlined call site information. Only emit functions inlined directly
+ // into the parent function. We'll emit the other sites recursively as part
+ // of their parent inline site.
+ for (auto &KV : FI.InlineSites) {
+ const DILocation *InlinedAt = KV.first;
+ if (!InlinedAt->getInlinedAt())
+ emitInlinedCallSite(FI, InlinedAt, KV.second);
+ }
+
// We're done with this function.
Asm->EmitInt16(0x0002);
Asm->EmitInt16(unsigned(SymbolRecordKind::S_PROC_ID_END));
Modified: llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.h?rev=259217&r1=259216&r2=259217&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.h (original)
+++ llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.h Fri Jan 29 12:16:43 2016
@@ -22,6 +22,7 @@
#include "llvm/CodeGen/LexicalScopes.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/DebugInfo/CodeView/TypeIndex.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/MC/MCStreamer.h"
@@ -33,19 +34,31 @@ class LLVM_LIBRARY_VISIBILITY CodeViewDe
AsmPrinter *Asm;
DebugLoc PrevInstLoc;
+ struct InlineSite {
+ TinyPtrVector<const DILocation *> ChildSites;
+ const DISubprogram *Inlinee = nullptr;
+ unsigned SiteFuncId = 0;
+ };
+
// For each function, store a vector of labels to its instructions, as well as
// to the end of the function.
struct FunctionInfo {
+ /// Map from inlined call site to inlined instructions and child inlined
+ /// call sites. Listed in program order.
+ MapVector<const DILocation *, InlineSite> InlineSites;
+
DebugLoc LastLoc;
MCSymbol *End = nullptr;
unsigned FuncId = 0;
- unsigned LastFileId;
+ unsigned LastFileId = 0;
bool HaveLineInfo = false;
};
FunctionInfo *CurFn;
unsigned NextFuncId = 0;
+ InlineSite &getInlineSite(const DILocation *Loc);
+
/// Remember some debug info about each function. Keep it in a stable order to
/// emit at the end of the TU.
MapVector<const Function *, FunctionInfo> FnDebugInfo;
@@ -53,6 +66,16 @@ class LLVM_LIBRARY_VISIBILITY CodeViewDe
/// Map from DIFile to .cv_file id.
DenseMap<const DIFile *, unsigned> FileIdMap;
+ DenseMap<const DISubprogram *, codeview::TypeIndex> SubprogramToFuncId;
+
+ unsigned TypeCount = 0;
+
+ /// Gets the next type index and increments the count of types streamed so
+ /// far.
+ codeview::TypeIndex getNextTypeIndex() {
+ return codeview::TypeIndex(codeview::TypeIndex::FirstNonSimpleIndex + TypeCount++);
+ }
+
typedef std::map<const DIFile *, std::string> FileToFilepathMapTy;
FileToFilepathMapTy FileToFilepathMap;
StringRef getFullFilepath(const DIFile *S);
@@ -68,8 +91,13 @@ class LLVM_LIBRARY_VISIBILITY CodeViewDe
FileToFilepathMap.clear();
}
+ void emitTypeInformation();
+
void emitDebugInfoForFunction(const Function *GV, FunctionInfo &FI);
+ void emitInlinedCallSite(const FunctionInfo &FI, const DILocation *InlinedAt,
+ const InlineSite &Site);
+
public:
CodeViewDebug(AsmPrinter *Asm);
Modified: llvm/trunk/lib/MC/MCObjectFileInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/MCObjectFileInfo.cpp?rev=259217&r1=259216&r2=259217&view=diff
==============================================================================
--- llvm/trunk/lib/MC/MCObjectFileInfo.cpp (original)
+++ llvm/trunk/lib/MC/MCObjectFileInfo.cpp Fri Jan 29 12:16:43 2016
@@ -191,6 +191,7 @@ void MCObjectFileInfo::initMachOMCObject
SectionKind::getReadOnlyWithRel());
COFFDebugSymbolsSection = nullptr;
+ COFFDebugTypesSection = nullptr;
if (useCompactUnwind(T)) {
CompactUnwindSection =
@@ -484,6 +485,7 @@ void MCObjectFileInfo::initELFMCObjectFi
ELF::SHF_ALLOC);
COFFDebugSymbolsSection = nullptr;
+ COFFDebugTypesSection = nullptr;
// Debug Info Sections.
DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
@@ -623,9 +625,14 @@ void MCObjectFileInfo::initCOFFMCObjectF
// Debug info.
COFFDebugSymbolsSection =
- Ctx->getCOFFSection(".debug$S", COFF::IMAGE_SCN_MEM_DISCARDABLE |
- COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
- COFF::IMAGE_SCN_MEM_READ,
+ Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
+ COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
+ COFF::IMAGE_SCN_MEM_READ),
+ SectionKind::getMetadata());
+ COFFDebugTypesSection =
+ Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
+ COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
+ COFF::IMAGE_SCN_MEM_READ),
SectionKind::getMetadata());
DwarfAbbrevSection = Ctx->getCOFFSection(
Added: llvm/trunk/test/DebugInfo/COFF/inlining.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/COFF/inlining.ll?rev=259217&view=auto
==============================================================================
--- llvm/trunk/test/DebugInfo/COFF/inlining.ll (added)
+++ llvm/trunk/test/DebugInfo/COFF/inlining.ll Fri Jan 29 12:16:43 2016
@@ -0,0 +1,160 @@
+; RUN: llc -mcpu=core2 -mtriple=i686-pc-win32 < %s | FileCheck %s --check-prefix=ASM
+; RUN: llc -mcpu=core2 -mtriple=i686-pc-win32 < %s -filetype=obj | llvm-readobj -codeview | FileCheck %s --check-prefix=OBJ
+
+; This LL file was generated by running 'clang -O1 -g -gcodeview' on the
+; following code:
+; 1: extern volatile int x;
+; 2: static inline void foo() {
+; 3: int y = 1;
+; 4: x += (int)&y;
+; 5: x += 2;
+; 6: x += 3;
+; 7: }
+; 8: static inline void bar() {
+; 9: x += 4;
+; 10: foo();
+; 11: x += 5;
+; 12: }
+; 13: void baz() {
+; 14: x += 6;
+; 15: bar();
+; 16: x += 7;
+; 17: }
+
+; ASM: .cv_loc 0 1 13 0 is_stmt 0 # t.cpp:13:0
+; ASM: .cv_loc 0 1 14 5 # t.cpp:14:5
+; ASM: addl $6, "?x@@3HC"
+; ASM: .cv_loc 1 1 9 5 # t.cpp:9:5
+; ASM: addl $4, "?x@@3HC"
+; ASM: .cv_loc 2 1 3 7 # t.cpp:3:7
+; ASM: .cv_loc 2 1 4 5 # t.cpp:4:5
+; ASM: addl {{.*}}, "?x@@3HC"
+; ASM: .cv_loc 2 1 5 5 # t.cpp:5:5
+; ASM: addl $2, "?x@@3HC"
+; ASM: .cv_loc 2 1 6 5 # t.cpp:6:5
+; ASM: addl $3, "?x@@3HC"
+; ASM: .cv_loc 1 1 11 5 # t.cpp:11:5
+; ASM: addl $5, "?x@@3HC"
+; ASM: .cv_loc 0 1 16 5 # t.cpp:16:5
+; ASM: addl $7, "?x@@3HC"
+; ASM: .cv_loc 0 1 17 1 # t.cpp:17:1
+
+; OBJ: ProcStart {
+; OBJ: PtrParent: 0x0
+; OBJ: PtrEnd: 0x0
+; OBJ: PtrNext: 0x0
+; OBJ: CodeSize: 0x3D
+; OBJ: DbgStart: 0x0
+; OBJ: DbgEnd: 0x0
+; OBJ: FunctionType: 0x0
+; OBJ: CodeOffset: ?baz@@YAXXZ+0x0
+; OBJ: Segment: 0x0
+; OBJ: Flags [ (0x0)
+; OBJ: ]
+; OBJ: DisplayName: baz
+; OBJ: LinkageName: ?baz@@YAXXZ
+; OBJ: }
+; OBJ: InlineSite {
+; OBJ: PtrParent: 0x0
+; OBJ: PtrEnd: 0x0
+; OBJ: Inlinee: bar (0x1003)
+; OBJ: BinaryAnnotations [
+; OBJ: ]
+; OBJ: }
+; OBJ: InlineSite {
+; OBJ: PtrParent: 0x0
+; OBJ: PtrEnd: 0x0
+; OBJ: Inlinee: foo (0x1004)
+; OBJ: BinaryAnnotations [
+; OBJ: ]
+; OBJ: }
+; OBJ: InlineSiteEnd {
+; OBJ: }
+; OBJ: InlineSiteEnd {
+; OBJ: }
+; OBJ: ProcEnd
+
+; ModuleID = 't.cpp'
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc18.0.0"
+
+@"\01?x@@3HC" = external global i32, align 4
+
+; Function Attrs: norecurse nounwind uwtable
+define void @"\01?baz@@YAXXZ"() #0 !dbg !4 {
+entry:
+ %y.i.i = alloca i32, align 4
+ %0 = load volatile i32, i32* @"\01?x@@3HC", align 4, !dbg !12, !tbaa !13
+ %add = add nsw i32 %0, 6, !dbg !12
+ store volatile i32 %add, i32* @"\01?x@@3HC", align 4, !dbg !12, !tbaa !13
+ %1 = load volatile i32, i32* @"\01?x@@3HC", align 4, !dbg !17, !tbaa !13
+ %add.i = add nsw i32 %1, 4, !dbg !17
+ store volatile i32 %add.i, i32* @"\01?x@@3HC", align 4, !dbg !17, !tbaa !13
+ %2 = bitcast i32* %y.i.i to i8*, !dbg !19
+ call void @llvm.lifetime.start(i64 4, i8* %2) #2, !dbg !19
+ store i32 1, i32* %y.i.i, align 4, !dbg !21, !tbaa !13
+ %3 = ptrtoint i32* %y.i.i to i64, !dbg !22
+ %4 = trunc i64 %3 to i32, !dbg !22
+ %5 = load volatile i32, i32* @"\01?x@@3HC", align 4, !dbg !23, !tbaa !13
+ %add.i.i = add nsw i32 %5, %4, !dbg !23
+ store volatile i32 %add.i.i, i32* @"\01?x@@3HC", align 4, !dbg !23, !tbaa !13
+ %6 = load volatile i32, i32* @"\01?x@@3HC", align 4, !dbg !24, !tbaa !13
+ %add1.i.i = add nsw i32 %6, 2, !dbg !24
+ store volatile i32 %add1.i.i, i32* @"\01?x@@3HC", align 4, !dbg !24, !tbaa !13
+ %7 = load volatile i32, i32* @"\01?x@@3HC", align 4, !dbg !25, !tbaa !13
+ %add2.i.i = add nsw i32 %7, 3, !dbg !25
+ store volatile i32 %add2.i.i, i32* @"\01?x@@3HC", align 4, !dbg !25, !tbaa !13
+ call void @llvm.lifetime.end(i64 4, i8* %2) #2, !dbg !26
+ %8 = load volatile i32, i32* @"\01?x@@3HC", align 4, !dbg !27, !tbaa !13
+ %add1.i = add nsw i32 %8, 5, !dbg !27
+ store volatile i32 %add1.i, i32* @"\01?x@@3HC", align 4, !dbg !27, !tbaa !13
+ %9 = load volatile i32, i32* @"\01?x@@3HC", align 4, !dbg !28, !tbaa !13
+ %add1 = add nsw i32 %9, 7, !dbg !28
+ store volatile i32 %add1, i32* @"\01?x@@3HC", align 4, !dbg !28, !tbaa !13
+ ret void, !dbg !29
+}
+
+; Function Attrs: argmemonly nounwind
+declare void @llvm.lifetime.start(i64, i8* nocapture) #1
+
+; Function Attrs: argmemonly nounwind
+declare void @llvm.lifetime.end(i64, i8* nocapture) #1
+
+attributes #0 = { norecurse nounwind uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { argmemonly nounwind }
+attributes #2 = { nounwind }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!8, !9, !10}
+!llvm.ident = !{!11}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.9.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: 2, enums: !2, subprograms: !3)
+!1 = !DIFile(filename: "t.cpp", directory: "D:\5Csrc\5Cllvm\5Cbuild")
+!2 = !{}
+!3 = !{!4, !6, !7}
+!4 = distinct !DISubprogram(name: "baz", scope: !1, file: !1, line: 13, type: !5, isLocal: false, isDefinition: true, scopeLine: 13, flags: DIFlagPrototyped, isOptimized: true, variables: !2)
+!5 = !DISubroutineType(types: !2)
+!6 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 8, type: !5, isLocal: true, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, variables: !2)
+!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !5, isLocal: true, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, variables: !2)
+!8 = !{i32 2, !"CodeView", i32 1}
+!9 = !{i32 2, !"Debug Info Version", i32 3}
+!10 = !{i32 1, !"PIC Level", i32 2}
+!11 = !{!"clang version 3.9.0 "}
+!12 = !DILocation(line: 14, column: 5, scope: !4)
+!13 = !{!14, !14, i64 0}
+!14 = !{!"int", !15, i64 0}
+!15 = !{!"omnipotent char", !16, i64 0}
+!16 = !{!"Simple C/C++ TBAA"}
+!17 = !DILocation(line: 9, column: 5, scope: !6, inlinedAt: !18)
+!18 = distinct !DILocation(line: 15, column: 3, scope: !4)
+!19 = !DILocation(line: 3, column: 3, scope: !7, inlinedAt: !20)
+!20 = distinct !DILocation(line: 10, column: 3, scope: !6, inlinedAt: !18)
+!21 = !DILocation(line: 3, column: 7, scope: !7, inlinedAt: !20)
+!22 = !DILocation(line: 4, column: 8, scope: !7, inlinedAt: !20)
+!23 = !DILocation(line: 4, column: 5, scope: !7, inlinedAt: !20)
+!24 = !DILocation(line: 5, column: 5, scope: !7, inlinedAt: !20)
+!25 = !DILocation(line: 6, column: 5, scope: !7, inlinedAt: !20)
+!26 = !DILocation(line: 7, column: 1, scope: !7, inlinedAt: !20)
+!27 = !DILocation(line: 11, column: 5, scope: !6, inlinedAt: !18)
+!28 = !DILocation(line: 16, column: 5, scope: !4)
+!29 = !DILocation(line: 17, column: 1, scope: !4)
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