[llvm] r182791 - LTO+Debug Info: correctly emit inlined_subroutine when the inlined callee is
Eric Christopher
echristo at gmail.com
Tue May 28 13:16:43 PDT 2013
Hi Manman,
> It is a known issue that we should bump DWARF version from 2 to 3 since we are
> actually using dwarf3 ref_addr format. You tried to bump the version from 2 to 3 and reverted the patch because of bot failures.
> But if we are using ref_addr in a testing case, we need the version to be 3.
>
Yes.
> So what you are saying is that we should bump the version from 2 to 3 first, then add support such as cross-CU inlining, which uses ref_addr.
> Is my understanding correct?
We should have the ability to add 2, 3 or 4 (or 5) based on the
features we're using in the debug info. This should probably come down
via a requested level when we emit the IR for the TU. Alternately it
could be an backend feature, there are advantages/disadvantages either
way, but plumbing through support for turning on/changing features
based on overall dwarf level requested is needed.
> I am also working on supporting shared types among CUs, that uses ref_addr in a lot of places.
>
Would you explain here a bit more?
>> Also, please explain this better. If you can use a set of small
>> testcases I'd appreciate it, but large testcases will work.
> The testing case was generated from two simple cpp files. I will add comments about how I generated the testing case.
>
Thanks.
>>
>> Please also clean up the attributes on the test case.
> Will do.
>
Thanks.
-eric
> Thanks,
> Manman
>>
>> You should probably or may wish to revert this while you address or we
>> discuss these issues.
>>
>> -eric
>>
>>
>> On Tue, May 28, 2013 at 12:01 PM, Manman Ren <mren at apple.com> wrote:
>>> Author: mren
>>> Date: Tue May 28 14:01:58 2013
>>> New Revision: 182791
>>>
>>> URL: http://llvm.org/viewvc/llvm-project?rev=182791&view=rev
>>> Log:
>>> LTO+Debug Info: correctly emit inlined_subroutine when the inlined callee is
>>> from a different CU.
>>>
>>> We used to print out an error message and fail to generate inlined_subroutine.
>>>
>>> If we use ref_addr in the generated DWARF, the DWARF version should be 3 or
>>> above.
>>> rdar://13926659
>>>
>>> Added:
>>> llvm/trunk/test/DebugInfo/cross-cu-inline.ll
>>> Modified:
>>> llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
>>> llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
>>> llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h
>>>
>>> Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp?rev=182791&r1=182790&r2=182791&view=diff
>>> ==============================================================================
>>> --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp (original)
>>> +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp Tue May 28 14:01:58 2013
>>> @@ -1504,9 +1504,14 @@ DIE *CompileUnit::constructVariableDIE(D
>>> DIE *VariableDie = new DIE(Tag);
>>> DbgVariable *AbsVar = DV->getAbstractVariable();
>>> DIE *AbsDIE = AbsVar ? AbsVar->getDIE() : NULL;
>>> - if (AbsDIE)
>>> + if (AbsDIE) {
>>> + bool InSameCU = AbsDIE->getCompileUnit() == getCUDie();
>>> addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin,
>>> - dwarf::DW_FORM_ref4, AbsDIE);
>>> + InSameCU ? dwarf::DW_FORM_ref4 : dwarf::DW_FORM_ref_addr,
>>> + AbsDIE);
>>> + if (!InSameCU)
>>> + DD->setUseRefAddr(true);
>>> + }
>>> else {
>>> addString(VariableDie, dwarf::DW_AT_name, Name);
>>> addSourceLine(VariableDie, DV->getVariable());
>>>
>>> Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp?rev=182791&r1=182790&r2=182791&view=diff
>>> ==============================================================================
>>> --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp (original)
>>> +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp Tue May 28 14:01:58 2013
>>> @@ -190,6 +190,7 @@ DwarfDebug::DwarfDebug(AsmPrinter *A, Mo
>>> IsDarwinGDBCompat = false;
>>> } else
>>> IsDarwinGDBCompat = DarwinGDBCompat == Enable ? true : false;
>>> + UseRefAddr = false;
>>>
>>> if (DwarfAccelTables == Default) {
>>> if (IsDarwin)
>>> @@ -369,6 +370,8 @@ DIE *DwarfDebug::updateSubprogramScopeDI
>>> SPCU->addDIEEntry(SPDie, dwarf::DW_AT_abstract_origin,
>>> InSameCU ? dwarf::DW_FORM_ref4 : dwarf::DW_FORM_ref_addr,
>>> AbsSPDIE);
>>> + if (!InSameCU)
>>> + UseRefAddr = true;
>>> SPCU->addDie(SPDie);
>>> } else {
>>> DISubprogram SPDecl = SP.getFunctionDeclaration();
>>> @@ -469,6 +472,17 @@ DIE *DwarfDebug::constructLexicalScopeDI
>>> return ScopeDIE;
>>> }
>>>
>>> +DIE *DwarfDebug::findSPDieInAllCUs(const MDNode *N) {
>>> + for (DenseMap<const MDNode *, CompileUnit *>::iterator CUI = CUMap.begin(),
>>> + CUE = CUMap.end(); CUI != CUE; ++CUI) {
>>> + CompileUnit *TheCU = CUI->second;
>>> + DIE *SPDie = TheCU->getDIE(N);
>>> + if (SPDie)
>>> + return SPDie;
>>> + }
>>> + return 0;
>>> +}
>>> +
>>> // This scope represents inlined body of a function. Construct DIE to
>>> // represent this concrete inlined copy of the function.
>>> DIE *DwarfDebug::constructInlinedScopeDIE(CompileUnit *TheCU,
>>> @@ -481,7 +495,7 @@ DIE *DwarfDebug::constructInlinedScopeDI
>>> return NULL;
>>> DIScope DS(Scope->getScopeNode());
>>> DISubprogram InlinedSP = getDISubprogram(DS);
>>> - DIE *OriginDIE = TheCU->getDIE(InlinedSP);
>>> + DIE *OriginDIE = findSPDieInAllCUs(InlinedSP);
>>> if (!OriginDIE) {
>>> DEBUG(dbgs() << "Unable to find original DIE for an inlined subprogram.");
>>> return NULL;
>>> @@ -500,8 +514,12 @@ DIE *DwarfDebug::constructInlinedScopeDI
>>> "Invalid end label for an inlined scope!");
>>>
>>> DIE *ScopeDIE = new DIE(dwarf::DW_TAG_inlined_subroutine);
>>> + bool InSameCU = OriginDIE->getCompileUnit() == TheCU->getCUDie();
>>> TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_abstract_origin,
>>> - dwarf::DW_FORM_ref4, OriginDIE);
>>> + InSameCU ? dwarf::DW_FORM_ref4 : dwarf::DW_FORM_ref_addr,
>>> + OriginDIE);
>>> + if (!InSameCU)
>>> + UseRefAddr = true;
>>>
>>> if (Ranges.size() > 1) {
>>> // .debug_range section has not been laid out yet. Emit offset in
>>> @@ -558,9 +576,12 @@ DIE *DwarfDebug::constructScopeDIE(Compi
>>>
>>> DIScope DS(Scope->getScopeNode());
>>> // Early return to avoid creating dangling variable|scope DIEs.
>>> - if (!Scope->getInlinedAt() && DS.isSubprogram() && Scope->isAbstractScope() &&
>>> - !TheCU->getDIE(DS))
>>> - return NULL;
>>> + DIE *AbstractSPDie = 0;
>>> + if (!Scope->getInlinedAt() && DS.isSubprogram() && Scope->isAbstractScope()) {
>>> + AbstractSPDie = findSPDieInAllCUs(DS);
>>> + if (!AbstractSPDie)
>>> + return NULL;
>>> + }
>>>
>>> SmallVector<DIE *, 8> Children;
>>> DIE *ObjectPointer = NULL;
>>> @@ -593,7 +614,7 @@ DIE *DwarfDebug::constructScopeDIE(Compi
>>> else if (DS.isSubprogram()) {
>>> ProcessedSPNodes.insert(DS);
>>> if (Scope->isAbstractScope()) {
>>> - ScopeDIE = TheCU->getDIE(DS);
>>> + ScopeDIE = AbstractSPDie;
>>> // Note down abstract DIE.
>>> if (ScopeDIE)
>>> AbstractSPDies.insert(std::make_pair(DS, ScopeDIE));
>>> @@ -1683,7 +1704,9 @@ void DwarfDebug::endFunction(const Machi
>>> }
>>> }
>>> if (ProcessedSPNodes.count(AScope->getScopeNode()) == 0)
>>> - constructScopeDIE(TheCU, AScope);
>>> + // Use the compile unit for the abstract scope to create scope DIEs and
>>> + // variable DIEs.
>>> + constructScopeDIE(SPMap.lookup(AScope->getScopeNode()), AScope);
>>> }
>>>
>>> DIE *CurFnDIE = constructScopeDIE(TheCU, FnScope);
>>> @@ -1973,7 +1996,8 @@ void DwarfUnits::emitUnits(DwarfDebug *D
>>> Asm->OutStreamer.AddComment("Length of Compilation Unit Info");
>>> Asm->EmitInt32(ContentSize);
>>> Asm->OutStreamer.AddComment("DWARF version number");
>>> - Asm->EmitInt16(dwarf::DWARF_VERSION);
>>> + Asm->EmitInt16((DD->getUseRefAddr() && dwarf::DWARF_VERSION < 3) ?
>>> + 3 : dwarf::DWARF_VERSION);
>>> Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
>>> Asm->EmitSectionOffset(Asm->GetTempSymbol(ASection->getLabelBeginName()),
>>> ASectionSym);
>>> @@ -2214,7 +2238,8 @@ void DwarfDebug::emitDebugPubnames() {
>>> Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_begin", ID));
>>>
>>> Asm->OutStreamer.AddComment("DWARF Version");
>>> - Asm->EmitInt16(dwarf::DWARF_VERSION);
>>> + Asm->EmitInt16((UseRefAddr && dwarf::DWARF_VERSION < 3) ?
>>> + 3 : dwarf::DWARF_VERSION);
>>>
>>> Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
>>> Asm->EmitSectionOffset(Asm->GetTempSymbol(ISec->getLabelBeginName(), ID),
>>> @@ -2261,7 +2286,8 @@ void DwarfDebug::emitDebugPubTypes() {
>>> TheCU->getUniqueID()));
>>>
>>> if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DWARF Version");
>>> - Asm->EmitInt16(dwarf::DWARF_VERSION);
>>> + Asm->EmitInt16((UseRefAddr && dwarf::DWARF_VERSION < 3) ?
>>> + 3 : dwarf::DWARF_VERSION);
>>>
>>> Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
>>> const MCSection *ISec = Asm->getObjFileLowering().getDwarfInfoSection();
>>> @@ -2544,7 +2570,8 @@ void DwarfDebug::emitDebugInlineInfo() {
>>> Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_begin", 1));
>>>
>>> Asm->OutStreamer.AddComment("Dwarf Version");
>>> - Asm->EmitInt16(dwarf::DWARF_VERSION);
>>> + Asm->EmitInt16((UseRefAddr && dwarf::DWARF_VERSION < 3) ?
>>> + 3 : dwarf::DWARF_VERSION);
>>> Asm->OutStreamer.AddComment("Address Size (in bytes)");
>>> Asm->EmitInt8(Asm->getDataLayout().getPointerSize());
>>>
>>>
>>> Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h
>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h?rev=182791&r1=182790&r2=182791&view=diff
>>> ==============================================================================
>>> --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h (original)
>>> +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h Tue May 28 14:01:58 2013
>>> @@ -402,6 +402,9 @@ class DwarfDebug {
>>> // Whether or not we're emitting info for older versions of gdb on darwin.
>>> bool IsDarwinGDBCompat;
>>>
>>> + // Whether or not we use ref_addr in the generated DWARF.
>>> + unsigned UseRefAddr;
>>> +
>>> // DWARF5 Experimental Options
>>> bool HasDwarfAccelTables;
>>> bool HasSplitDwarf;
>>> @@ -601,6 +604,9 @@ private:
>>> /// \brief Return Label immediately following the instruction.
>>> MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
>>>
>>> + /// \brief Search all compile units to find the SP DIE for the given MDNode.
>>> + DIE *findSPDieInAllCUs(const MDNode *N);
>>> +
>>> public:
>>> //===--------------------------------------------------------------------===//
>>> // Main entry points.
>>> @@ -640,6 +646,9 @@ public:
>>> /// output to the limitations of darwin gdb.
>>> bool useDarwinGDBCompat() { return IsDarwinGDBCompat; }
>>>
>>> + bool getUseRefAddr() { return UseRefAddr; }
>>> + void setUseRefAddr(bool RefAddr) { UseRefAddr = RefAddr; }
>>> +
>>> // Experimental DWARF5 features.
>>>
>>> /// \brief Returns whether or not to emit tables that dwarf consumers can
>>>
>>> Added: llvm/trunk/test/DebugInfo/cross-cu-inline.ll
>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/cross-cu-inline.ll?rev=182791&view=auto
>>> ==============================================================================
>>> --- llvm/trunk/test/DebugInfo/cross-cu-inline.ll (added)
>>> +++ llvm/trunk/test/DebugInfo/cross-cu-inline.ll Tue May 28 14:01:58 2013
>>> @@ -0,0 +1,117 @@
>>> +; RUN: llc -O0 -filetype=obj < %s > %t
>>> +; RUN: llvm-dwarfdump %t | FileCheck %s
>>> +
>>> +; rdar://13926659
>>> +; When a callee from a different CU is inlined, we should generate
>>> +; inlined_subroutine with abstract_origin pointing to a DIE in a different
>>> +; CU.
>>> +; CHECK: debug_info contents
>>> +; CHECK: DW_TAG_inlined_subroutine
>>> +; CHECK: DW_AT_abstract_origin [DW_FORM_ref_addr] (0x{{[0]*}}[[ORIGIN:.*]])
>>> +; CHECK: DW_TAG_formal_parameter
>>> +; CHECK: DW_AT_abstract_origin [DW_FORM_ref_addr] (0x{{[0]*}}[[PARAM_ORIGIN:.*]])
>>> +; CHECK: 0x{{[0]*}}[[ORIGIN]]: DW_TAG_subprogram
>>> +; CHECK: DW_AT_name {{.*}} ( .debug_str[{{.*}}] = "bar2")
>>> +; CHECK: DW_AT_inline
>>> +; CHECK: 0x{{[0]*}}[[PARAM_ORIGIN]]: DW_TAG_formal_parameter
>>> +; CHECK: DW_TAG_subprogram
>>> +; CHECK: DW_AT_abstract_origin [DW_FORM_ref4] (cu + {{.*}} => {0x{{[0]*}}[[ORIGIN]]})
>>> +
>>> +target triple = "x86_64-apple-macosx"
>>> +%struct.Foo = type { i32, i32 }
>>> +
>>> +; Function Attrs: noinline ssp uwtable
>>> +define i32 @_Z3fooi(i32 %a) #0 {
>>> + %1 = alloca i32, align 4
>>> + %2 = alloca i32, align 4
>>> + %g = alloca %struct.Foo, align 4
>>> + store i32 %a, i32* %2, align 4
>>> + call void @llvm.dbg.declare(metadata !{i32* %2}, metadata !17), !dbg !18
>>> + call void @llvm.dbg.declare(metadata !{%struct.Foo* %g}, metadata !19), !dbg !24
>>> + %3 = getelementptr inbounds %struct.Foo* %g, i32 0, i32 0, !dbg !24
>>> + %4 = load i32* %2, align 4, !dbg !24
>>> + store i32 %4, i32* %3, align 4, !dbg !24
>>> + %5 = getelementptr inbounds %struct.Foo* %g, i32 0, i32 1, !dbg !24
>>> + %6 = load i32* %2, align 4, !dbg !24
>>> + store i32 %6, i32* %5, align 4, !dbg !24
>>> + %7 = load i32* %2, align 4, !dbg !25
>>> + %8 = load i32* %2, align 4, !dbg !25
>>> + %9 = bitcast i32* %1 to i8*
>>> + call void @llvm.lifetime.start(i64 4, i8* %9)
>>> + store i32 %8, i32* %1, align 4
>>> + call void @llvm.dbg.declare(metadata !{i32* %1}, metadata !26), !dbg !27
>>> + %10 = load i32* %1, align 4, !dbg !28
>>> + %11 = mul nsw i32 2, %10, !dbg !28
>>> + %12 = bitcast i32* %1 to i8*, !dbg !28
>>> + call void @llvm.lifetime.end(i64 4, i8* %12), !dbg !28
>>> + %13 = add nsw i32 %7, %11, !dbg !25
>>> + ret i32 %13, !dbg !25
>>> +}
>>> +
>>> +; Function Attrs: nounwind readnone
>>> +declare void @llvm.dbg.declare(metadata, metadata) #1
>>> +
>>> +; Function Attrs: alwaysinline nounwind ssp uwtable
>>> +define i32 @_Z4bar2i(i32 %ab) #2 {
>>> + %1 = alloca i32, align 4
>>> + store i32 %ab, i32* %1, align 4
>>> + call void @llvm.dbg.declare(metadata !{i32* %1}, metadata !26), !dbg !29
>>> + %2 = load i32* %1, align 4, !dbg !30
>>> + %3 = mul nsw i32 2, %2, !dbg !30
>>> + ret i32 %3, !dbg !30
>>> +}
>>> +
>>> +; Function Attrs: ssp uwtable
>>> +define i32 @main() #3 {
>>> + %1 = alloca i32, align 4
>>> + store i32 0, i32* %1
>>> + %2 = call i32 @_Z3fooi(i32 44), !dbg !31
>>> + ret i32 %2, !dbg !31
>>> +}
>>> +
>>> +; Function Attrs: nounwind
>>> +declare void @llvm.lifetime.start(i64, i8* nocapture) #4
>>> +
>>> +; Function Attrs: nounwind
>>> +declare void @llvm.lifetime.end(i64, i8* nocapture) #4
>>> +
>>> +attributes #0 = { noinline ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
>>> +attributes #1 = { nounwind readnone }
>>> +attributes #2 = { alwaysinline nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
>>> +attributes #3 = { ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
>>> +attributes #4 = { nounwind }
>>> +
>>> +!llvm.dbg.cu = !{!0, !9}
>>> +
>>> +!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.4 (trunk 182336)", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !""} ; [ DW_TAG_compile_unit ] [foo.cpp] [DW_LANG_C_plus_plus]
>>> +!1 = metadata !{metadata !"foo.cpp", metadata !"."}
>>> +!2 = metadata !{i32 0}
>>> +!3 = metadata !{metadata !4}
>>> +!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"foo", metadata !"foo", metadata !"_Z3fooi", i32 3, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 (i32)* @_Z3fooi, null, null, metadata !2, i32 3} ; [ DW_TAG_subprogram ] [line 3] [def] [foo]
>>> +!5 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ]
>>> +!6 = metadata !{i32 786453, i32 0, i32 0, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !7, i32 0, i32 0} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
>>> +!7 = metadata !{metadata !8, metadata !8}
>>> +!8 = 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]
>>> +!9 = metadata !{i32 786449, metadata !10, i32 4, metadata !"clang version 3.4 (trunk 182336)", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !11, metadata !2, metadata !2, metadata !""} ; [ DW_TAG_compile_unit ] [bar.cpp] [DW_LANG_C_plus_plus]
>>> +!10 = metadata !{metadata !"bar.cpp", metadata !"."}
>>> +!11 = metadata !{metadata !12, metadata !14}
>>> +!12 = metadata !{i32 786478, metadata !10, metadata !13, metadata !"bar2", metadata !"bar2", metadata !"_Z4bar2i", i32 2, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 (i32)* @_Z4bar2i, null, null, metadata !2, i32 2} ; [ DW_TAG_subprogram ] [line 2] [def] [bar2]
>>> +!13 = metadata !{i32 786473, metadata !10} ; [ DW_TAG_file_type ]
>>> +!14 = metadata !{i32 786478, metadata !10, metadata !13, metadata !"main", metadata !"main", metadata !"", i32 15, metadata !15, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 ()* @main, null, null, metadata !2, i32 15} ; [ DW_TAG_subprogram ] [line 15] [def] [main]
>>> +!15 = metadata !{i32 786453, i32 0, i32 0, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !16, i32 0, i32 0} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
>>> +!16 = metadata !{metadata !8}
>>> +!17 = metadata !{i32 786689, metadata !4, metadata !"a", metadata !5, i32 16777219, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [a] [line 3]
>>> +!18 = metadata !{i32 3, i32 0, metadata !4, null}
>>> +!19 = metadata !{i32 786688, metadata !4, metadata !"g", metadata !5, i32 9, metadata !20, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [g] [line 9]
>>> +!20 = metadata !{i32 786451, metadata !1, metadata !4, metadata !"Foo", i32 4, i64 64, i64 32, i32 0, i32 0, null, metadata !21, i32 0, null, null} ; [ DW_TAG_structure_type ] [Foo] [line 4, size 64, align 32, offset 0] [from ]
>>> +!21 = metadata !{metadata !22, metadata !23}
>>> +!22 = metadata !{i32 786445, metadata !1, metadata !20, metadata !"a", i32 5, i64 32, i64 32, i64 0, i32 0, metadata !8} ; [ DW_TAG_member ] [a] [line 5, size 32, align 32, offset 0] [from int]
>>> +!23 = metadata !{i32 786445, metadata !1, metadata !20, metadata !"b", i32 6, i64 32, i64 32, i64 32, i32 0, metadata !8} ; [ DW_TAG_member ] [b] [line 6, size 32, align 32, offset 32] [from int]
>>> +!24 = metadata !{i32 9, i32 0, metadata !4, null}
>>> +!25 = metadata !{i32 10, i32 0, metadata !4, null}
>>> +!26 = metadata !{i32 786689, metadata !12, metadata !"ab", metadata !13, i32 16777218, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [ab] [line 2]
>>> +!27 = metadata !{i32 2, i32 0, metadata !12, metadata !25}
>>> +!28 = metadata !{i32 11, i32 0, metadata !12, metadata !25}
>>> +!29 = metadata !{i32 2, i32 0, metadata !12, null}
>>> +!30 = metadata !{i32 11, i32 0, metadata !12, null}
>>> +!31 = metadata !{i32 16, i32 0, metadata !14, null}
>>>
>>>
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