[llvm] r340583 - DebugInfo: Improve debug location merging
David Blaikie via llvm-commits
llvm-commits at lists.llvm.org
Mon Aug 27 18:43:04 PDT 2018
On Mon, Aug 27, 2018 at 6:38 PM Reid Kleckner <rnk at google.com> wrote:
> The root of the problem is that we emit assembly like this:
>
> calll "?b@@YAXPADH0JJ at Z"
> Ltmp10:
> .cv_loc 2 1 8 0 # t.cpp:8:0
> .cv_fpo_endproc
> Lfunc_end0:
> # -- End function
> .def "?n@@YAXXZ";
> .scl 2;
> .type 32;
> .endef
> .globl "?n@@YAXXZ" # -- Begin function ?n@@YAXXZ
> .p2align 4, 0x90
> "?n@@YAXXZ": # @"?n@@YAXXZ"
> Lfunc_begin1:
> .cv_func_id 5
> .cv_fpo_proc "?n@@YAXXZ" 0
> # %bb.0: # %entry
> .cv_loc 5 1 27 0 # t.cpp:27:0
> retl
>
> We are asserting that the label generated by .cv_loc 2 1 8 0 (t.cpp:8:0)
> comes before the Lfunc_end0 label. In the context of emitting codeview,
> that makes sense, we are emitting deltas, and they should all be positive.
>
What did the assembly look like previously? the .cv_loc 2 1 8 0 must've
been attached to some instruction, right? But an instruction that ended up
optimized away too late? (after the loc directive had been generated)
> The thing is that the .cv_loc directives bind to the *next* instruction
> emitted, and in this case, ffunction-sections is off, so we bind to the
> 'retl' instruction in the next function, and we have a negative delta, so
> we assert.
>
> DWARF locations are similarly affected, but there's no real problem there,
> since they just generate one huge line table per section IIRC.
>
> Does anyone know why we wait until we emit an instruction to insert
> labels? Why don't we do it right at the point of the directive? For
> .cv_loc, we just copied the behavior from .loc, which I can't explain.
>
Not sure, to be honest.
>
> On Mon, Aug 27, 2018 at 6:06 PM Reid Kleckner <rnk at google.com> wrote:
>
>> I got the crash files and am running a reduction.
>>
>> What's happening is that this file has a function with several CHECKs,
>> and their failure cases get commoned together. We're using this new merged
>> source location, and something goes wrong.
>>
>> On Mon, Aug 27, 2018 at 5:18 PM Vitaly Buka <vitalybuka at google.com>
>> wrote:
>>
>>> I can't reproduce on Linux.
>>> +Reid Kleckner <rnk at google.com>
>>>
>>>
>>> On Mon, Aug 27, 2018 at 5:12 PM David Blaikie <dblaikie at gmail.com>
>>> wrote:
>>>
>>>> Yeah, I'm totally open to some ideas on investigating that - can you
>>>> reproduce this? Does it reproduce not on windows? I'd love some help!
>>>>
>>>> On Mon, Aug 27, 2018 at 5:09 PM Vitaly Buka <vitalybuka at google.com>
>>>> wrote:
>>>>
>>>>> This revision breaks windows bot
>>>>>
>>>>> http://lab.llvm.org:8011/builders/sanitizer-windows/builds/33862/steps/run%20check-sanitizer/logs/stdio
>>>>>
>>>>> FAILED: projects/compiler-rt/lib/sanitizer_common/tests/SANITIZER_TEST_OBJECTS.sanitizer_stacktrace_printer_test.cc.i386.o
>>>>> cmd.exe /C "cd /D C:\b\slave\sanitizer-windows\build\projects\compiler-rt\lib\sanitizer_common\tests && C:\b\slave\sanitizer-windows\build\.\bin\clang.exe -DWIN32 -D_WINDOWS -Wno-unknown-warning-option -fms-compatibility-version=19.00.24215.1 -D_HAS_EXCEPTIONS=0 -Wno-undefined-inline -DGTEST_NO_LLVM_RAW_OSTREAM=1 -DGTEST_HAS_RTTI=0 -IC:/b/slave/sanitizer-windows/llvm/utils/unittest/googletest/include -IC:/b/slave/sanitizer-windows/llvm/utils/unittest/googletest -DGTEST_HAS_SEH=0 -Wno-deprecated-declarations -IC:/b/slave/sanitizer-windows/llvm/projects/compiler-rt/include -IC:/b/slave/sanitizer-windows/llvm/projects/compiler-rt/lib -IC:/b/slave/sanitizer-windows/llvm/projects/compiler-rt/lib/sanitizer_common -fno-rtti -O2 -Werror=sign-compare -Wno-non-virtual-dtor -Wno-gnu-zero-variadic-macro-arguments -fno-exceptions -DGTEST_HAS_SEH=0 -gline-tables-only -gcodeview -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -c -o SANITIZER_TEST_OBJECTS.sanitizer_stacktrace_printer_test.cc.i386.o C:/b/slave/sanitizer-windows/llvm/projects/compiler-rt/lib/sanitizer_common/tests/sanitizer_stacktrace_printer_test.cc"
>>>>> Assertion failed: Result >= 0 && "negative label difference requested", file C:\b\slave\sanitizer-windows\llvm\lib\MC\MCCodeView.cpp, line 449
>>>>>
>>>>> Wrote crash dump file "C:\Users\buildbot\AppData\Local\Temp\clang.exe-30d2bf.dmp"
>>>>>
>>>>> LLVMSymbolizer: error reading file: PDB Error: Unable to load PDB. Make sure the file exists and is readable. Calling loadDataForExe
>>>>>
>>>>>
>>>>>
>>>>> #0 0x021cf367 (C:\b\slave\sanitizer-windows\build\bin\clang.exe+0x119f367)
>>>>>
>>>>> #1 0x72ec91d2 (C:\windows\SYSTEM32\ucrtbase.DLL+0x891d2)
>>>>>
>>>>> #2 0x72eca7e1 (C:\windows\SYSTEM32\ucrtbase.DLL+0x8a7e1)
>>>>>
>>>>> #3 0x72ec9c1e (C:\windows\SYSTEM32\ucrtbase.DLL+0x89c1e)
>>>>>
>>>>> #4 0x72eca8e6 (C:\windows\SYSTEM32\ucrtbase.DLL+0x8a8e6)
>>>>>
>>>>> #5 0x0201cad9 (C:\b\slave\sanitizer-windows\build\bin\clang.exe+0xfecad9)
>>>>>
>>>>> #6 0x0201e219 (C:\b\slave\sanitizer-windows\build\bin\clang.exe+0xfee219)
>>>>>
>>>>> #7 0x02010b71 (C:\b\slave\sanitizer-windows\build\bin\clang.exe+0xfe0b71)
>>>>>
>>>>> #8 0x020109f6 (C:\b\slave\sanitizer-windows\build\bin\clang.exe+0xfe09f6)
>>>>>
>>>>> #9 0x0201049d (C:\b\slave\sanitizer-windows\build\bin\clang.exe+0xfe049d)
>>>>>
>>>>> #10 0x01fee676 (C:\b\slave\sanitizer-windows\build\bin\clang.exe+0xfbe676)
>>>>>
>>>>> #11 0x021aa8b3 (C:\b\slave\sanitizer-windows\build\bin\clang.exe+0x117a8b3)
>>>>>
>>>>> #12 0x0200cd47 (C:\b\slave\sanitizer-windows\build\bin\clang.exe+0xfdcd47)
>>>>>
>>>>> clang: error: clang frontend command failed due to signal (use -v to see invocation)
>>>>>
>>>>> clang version 8.0.0 (trunk 340583)
>>>>>
>>>>> Target: i686-pc-windows-msvc
>>>>>
>>>>> Thread model: posix
>>>>>
>>>>> InstalledDir: C:\b\slave\sanitizer-windows\build\.\bin
>>>>>
>>>>> clang: note: diagnostic msg: PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script.
>>>>>
>>>>> clang: note: diagnostic msg:
>>>>>
>>>>> ********************
>>>>>
>>>>>
>>>>> On Thu, Aug 23, 2018 at 3:36 PM David Blaikie via llvm-commits <
>>>>> llvm-commits at lists.llvm.org> wrote:
>>>>>
>>>>>> Author: dblaikie
>>>>>> Date: Thu Aug 23 15:35:58 2018
>>>>>> New Revision: 340583
>>>>>>
>>>>>> URL: http://llvm.org/viewvc/llvm-project?rev=340583&view=rev
>>>>>> Log:
>>>>>> DebugInfo: Improve debug location merging
>>>>>>
>>>>>> Fix a set of related bugs:
>>>>>>
>>>>>> * Considering two locations as equivalent when their lines are the
>>>>>> same
>>>>>> but their scopes are different causes erroneous debug info that
>>>>>> attributes a commoned call to be attributed to one of the two calls it
>>>>>> was commoned from.
>>>>>>
>>>>>> * The previous code to compute a new location's scope was inaccurate
>>>>>> and
>>>>>> would use the inlinedAt that was the /parent/ of the inlinedAt that is
>>>>>> the nearest common one, and also used that parent scope instead of the
>>>>>> nearest common scope.
>>>>>>
>>>>>> * Not generating new locations generally seemed like a lower quality
>>>>>> choice
>>>>>>
>>>>>> There was some risk that generating more new locations could hurt
>>>>>> object
>>>>>> size by making more fine grained line table entries, but it looks like
>>>>>> that was offset by the decrease in line table (& address & ranges)
>>>>>> size
>>>>>> caused by more accurately computing the scope - which likely lead to
>>>>>> fewer range entries (more contiguous ranges) & reduced size that way.
>>>>>>
>>>>>> All up with these changes I saw minor reductions (-1.21%, -1.77%) in
>>>>>> .rela.debug_ranges and .rela.debug_addr (in a fission, compressed
>>>>>> debug
>>>>>> info build) as well as other minor size changes (generally reductinos)
>>>>>> across the board (-1.32% debug_info.dwo, -1.28% debug_loc.dwo).
>>>>>> Measured
>>>>>> in an optimized (-O2) build of the clang binary.
>>>>>>
>>>>>> If you are investigating a size regression in an optimized debug
>>>>>> builds,
>>>>>> this is certainly a patch to look into - and I'd be happy to look into
>>>>>> any major regressions found & see what we can do to address them.
>>>>>>
>>>>>> Added:
>>>>>> llvm/trunk/test/DebugInfo/X86/merge_inlined_loc.ll
>>>>>> Modified:
>>>>>> llvm/trunk/include/llvm/IR/DebugInfoMetadata.h
>>>>>> llvm/trunk/lib/IR/DebugInfo.cpp
>>>>>> llvm/trunk/lib/IR/DebugInfoMetadata.cpp
>>>>>> llvm/trunk/test/DebugInfo/COFF/local-variables.ll
>>>>>>
>>>>>> Modified: llvm/trunk/include/llvm/IR/DebugInfoMetadata.h
>>>>>> URL:
>>>>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/IR/DebugInfoMetadata.h?rev=340583&r1=340582&r2=340583&view=diff
>>>>>>
>>>>>> ==============================================================================
>>>>>> --- llvm/trunk/include/llvm/IR/DebugInfoMetadata.h (original)
>>>>>> +++ llvm/trunk/include/llvm/IR/DebugInfoMetadata.h Thu Aug 23
>>>>>> 15:35:58 2018
>>>>>> @@ -1479,19 +1479,6 @@ public:
>>>>>> return getScope();
>>>>>> }
>>>>>>
>>>>>> - /// Check whether this can be discriminated from another location.
>>>>>> - ///
>>>>>> - /// Check \c this can be discriminated from \c RHS in a linetable
>>>>>> entry.
>>>>>> - /// Scope and inlined-at chains are not recorded in the linetable,
>>>>>> so they
>>>>>> - /// cannot be used to distinguish basic blocks.
>>>>>> - bool canDiscriminate(const DILocation &RHS) const {
>>>>>> - return getLine() != RHS.getLine() ||
>>>>>> - getColumn() != RHS.getColumn() ||
>>>>>> - getDiscriminator() != RHS.getDiscriminator() ||
>>>>>> - getFilename() != RHS.getFilename() ||
>>>>>> - getDirectory() != RHS.getDirectory();
>>>>>> - }
>>>>>> -
>>>>>> /// Get the DWARF discriminator.
>>>>>> ///
>>>>>> /// DWARF discriminators distinguish identical file locations
>>>>>> between
>>>>>> @@ -1539,8 +1526,6 @@ public:
>>>>>> /// discriminator.
>>>>>> inline const DILocation *cloneWithDuplicationFactor(unsigned DF)
>>>>>> const;
>>>>>>
>>>>>> - enum { NoGeneratedLocation = false, WithGeneratedLocation = true };
>>>>>> -
>>>>>> /// When two instructions are combined into a single instruction
>>>>>> we also
>>>>>> /// need to combine the original locations into a single location.
>>>>>> ///
>>>>>> @@ -1555,9 +1540,8 @@ public:
>>>>>> ///
>>>>>> /// \p GenerateLocation: Whether the merged location can be
>>>>>> generated when
>>>>>> /// \p LocA and \p LocB differ.
>>>>>> - static const DILocation *
>>>>>> - getMergedLocation(const DILocation *LocA, const DILocation *LocB,
>>>>>> - bool GenerateLocation = NoGeneratedLocation);
>>>>>> + static const DILocation *getMergedLocation(const DILocation *LocA,
>>>>>> + const DILocation *LocB);
>>>>>>
>>>>>> /// Returns the base discriminator for a given encoded
>>>>>> discriminator \p D.
>>>>>> static unsigned getBaseDiscriminatorFromDiscriminator(unsigned D) {
>>>>>>
>>>>>> Modified: llvm/trunk/lib/IR/DebugInfo.cpp
>>>>>> URL:
>>>>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/IR/DebugInfo.cpp?rev=340583&r1=340582&r2=340583&view=diff
>>>>>>
>>>>>> ==============================================================================
>>>>>> --- llvm/trunk/lib/IR/DebugInfo.cpp (original)
>>>>>> +++ llvm/trunk/lib/IR/DebugInfo.cpp Thu Aug 23 15:35:58 2018
>>>>>> @@ -690,8 +690,7 @@ unsigned llvm::getDebugMetadataVersionFr
>>>>>>
>>>>>> void Instruction::applyMergedLocation(const DILocation *LocA,
>>>>>> const DILocation *LocB) {
>>>>>> - setDebugLoc(DILocation::getMergedLocation(LocA, LocB,
>>>>>> -
>>>>>> DILocation::WithGeneratedLocation));
>>>>>> + setDebugLoc(DILocation::getMergedLocation(LocA, LocB));
>>>>>> }
>>>>>>
>>>>>>
>>>>>> //===----------------------------------------------------------------------===//
>>>>>>
>>>>>> Modified: llvm/trunk/lib/IR/DebugInfoMetadata.cpp
>>>>>> URL:
>>>>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/IR/DebugInfoMetadata.cpp?rev=340583&r1=340582&r2=340583&view=diff
>>>>>>
>>>>>> ==============================================================================
>>>>>> --- llvm/trunk/lib/IR/DebugInfoMetadata.cpp (original)
>>>>>> +++ llvm/trunk/lib/IR/DebugInfoMetadata.cpp Thu Aug 23 15:35:58 2018
>>>>>> @@ -14,7 +14,7 @@
>>>>>> #include "llvm/IR/DebugInfoMetadata.h"
>>>>>> #include "LLVMContextImpl.h"
>>>>>> #include "MetadataImpl.h"
>>>>>> -#include "llvm/ADT/SmallPtrSet.h"
>>>>>> +#include "llvm/ADT/SmallSet.h"
>>>>>> #include "llvm/ADT/StringSwitch.h"
>>>>>> #include "llvm/IR/DIBuilder.h"
>>>>>> #include "llvm/IR/Function.h"
>>>>>> @@ -69,28 +69,40 @@ DILocation *DILocation::getImpl(LLVMCont
>>>>>> }
>>>>>>
>>>>>> const DILocation *DILocation::getMergedLocation(const DILocation
>>>>>> *LocA,
>>>>>> - const DILocation
>>>>>> *LocB,
>>>>>> - bool
>>>>>> GenerateLocation) {
>>>>>> + const DILocation
>>>>>> *LocB) {
>>>>>> if (!LocA || !LocB)
>>>>>> return nullptr;
>>>>>>
>>>>>> - if (LocA == LocB || !LocA->canDiscriminate(*LocB))
>>>>>> + if (LocA == LocB)
>>>>>> return LocA;
>>>>>>
>>>>>> - if (!GenerateLocation)
>>>>>> - return nullptr;
>>>>>> -
>>>>>> SmallPtrSet<DILocation *, 5> InlinedLocationsA;
>>>>>> for (DILocation *L = LocA->getInlinedAt(); L; L =
>>>>>> L->getInlinedAt())
>>>>>> InlinedLocationsA.insert(L);
>>>>>> + SmallSet<std::pair<DIScope *, DILocation *>, 5> Locations;
>>>>>> + DIScope *S = LocA->getScope();
>>>>>> + DILocation *L = LocA->getInlinedAt();
>>>>>> + while (S) {
>>>>>> + Locations.insert(std::make_pair(S, L));
>>>>>> + S = S->getScope().resolve();
>>>>>> + if (!S && L) {
>>>>>> + S = L->getScope();
>>>>>> + L = L->getInlinedAt();
>>>>>> + }
>>>>>> + }
>>>>>> const DILocation *Result = LocB;
>>>>>> - for (DILocation *L = LocB->getInlinedAt(); L; L =
>>>>>> L->getInlinedAt()) {
>>>>>> - Result = L;
>>>>>> - if (InlinedLocationsA.count(L))
>>>>>> + S = LocB->getScope();
>>>>>> + L = LocB->getInlinedAt();
>>>>>> + while (S) {
>>>>>> + if (Locations.count(std::make_pair(S, L)))
>>>>>> break;
>>>>>> + S = S->getScope().resolve();
>>>>>> + if (!S && L) {
>>>>>> + S = L->getScope();
>>>>>> + L = L->getInlinedAt();
>>>>>> + }
>>>>>> }
>>>>>> - return DILocation::get(Result->getContext(), 0, 0,
>>>>>> Result->getScope(),
>>>>>> - Result->getInlinedAt());
>>>>>> + return DILocation::get(Result->getContext(), 0, 0, S, L);
>>>>>> }
>>>>>>
>>>>>> DINode::DIFlags DINode::getFlag(StringRef Flag) {
>>>>>>
>>>>>> Modified: llvm/trunk/test/DebugInfo/COFF/local-variables.ll
>>>>>> URL:
>>>>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/COFF/local-variables.ll?rev=340583&r1=340582&r2=340583&view=diff
>>>>>>
>>>>>> ==============================================================================
>>>>>> --- llvm/trunk/test/DebugInfo/COFF/local-variables.ll (original)
>>>>>> +++ llvm/trunk/test/DebugInfo/COFF/local-variables.ll Thu Aug 23
>>>>>> 15:35:58 2018
>>>>>> @@ -60,7 +60,7 @@
>>>>>> ; ASM: leaq 36(%rsp), %rcx
>>>>>> ; ASM: [[else_end:\.Ltmp.*]]:
>>>>>> ; ASM: .LBB0_3: # %if.end
>>>>>> -; ASM: .cv_loc 0 1 17 1 # t.cpp:17:1
>>>>>> +; ASM: .cv_loc 0 1 0 0 # t.cpp:0:0
>>>>>> ; ASM: callq capture
>>>>>> ; ASM: nop
>>>>>> ; ASM: addq $56, %rsp
>>>>>>
>>>>>> Added: llvm/trunk/test/DebugInfo/X86/merge_inlined_loc.ll
>>>>>> URL:
>>>>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/merge_inlined_loc.ll?rev=340583&view=auto
>>>>>>
>>>>>> ==============================================================================
>>>>>> --- llvm/trunk/test/DebugInfo/X86/merge_inlined_loc.ll (added)
>>>>>> +++ llvm/trunk/test/DebugInfo/X86/merge_inlined_loc.ll Thu Aug 23
>>>>>> 15:35:58 2018
>>>>>> @@ -0,0 +1,100 @@
>>>>>> +; RUN: llc %s -mtriple=x86_64-unknown-unknown -o - | FileCheck %s
>>>>>> +
>>>>>> +; Generated with "clang -g -c -emit-llvm -S -O3"
>>>>>> +
>>>>>> +; This will test several features of merging debug locations.
>>>>>> Importantly,
>>>>>> +; locations with the same source line but different scopes should be
>>>>>> merged to
>>>>>> +; a line zero location at the nearest common scope and inlining. The
>>>>>> location
>>>>>> +; of the single call to "common" (the two calls are collapsed
>>>>>> together by
>>>>>> +; BranchFolding) should be attributed to line zero inside the
>>>>>> wrapper2 inlined
>>>>>> +; scope within f1.
>>>>>> +
>>>>>> +; void common();
>>>>>> +; inline void wrapper() { common(); }
>>>>>> +; extern bool b;
>>>>>> +; void sink();
>>>>>> +; inline void wrapper2() {
>>>>>> +; if (b) {
>>>>>> +; sink();
>>>>>> +; wrapper();
>>>>>> +; } else
>>>>>> +; wrapper();
>>>>>> +; }
>>>>>> +; void f1() { wrapper2(); }
>>>>>> +
>>>>>> +; Ensure there is only one inlined_subroutine (for wrapper2, none
>>>>>> for wrapper)
>>>>>> +; & that its address range includes the call to 'common'.
>>>>>> +
>>>>>> +; CHECK: jmp _Z6commonv
>>>>>> +; CHECK-NEXT: [[LABEL:.*]]:
>>>>>> +
>>>>>> +; CHECK: .section .debug_info
>>>>>> +; CHECK: DW_TAG_subprogram
>>>>>> +; CHECK: DW_TAG_subprogram
>>>>>> +; CHECK-NOT: {{DW_TAG\|End Of Children}}
>>>>>> +; CHECK: DW_TAG_inlined_subroutine
>>>>>> +; CHECK-NOT: {{DW_TAG\|End Of Children}}
>>>>>> +; CHECK: [[LABEL]]-{{.*}} DW_AT_high_pc
>>>>>> +; CHECK-NOT: DW_TAG
>>>>>> +
>>>>>> +
>>>>>> +
>>>>>> + at b = external dso_local local_unnamed_addr global i8, align 1
>>>>>> +
>>>>>> +; Function Attrs: uwtable
>>>>>> +define dso_local void @_Z2f1v() local_unnamed_addr !dbg !7 {
>>>>>> +entry:
>>>>>> + %0 = load i8, i8* @b, align 1, !dbg !10, !tbaa !14, !range !18
>>>>>> + %tobool.i = icmp eq i8 %0, 0, !dbg !10
>>>>>> + br i1 %tobool.i, label %if.else.i, label %if.then.i, !dbg !19
>>>>>> +
>>>>>> +if.then.i: ; preds = %entry
>>>>>> + tail call void @_Z4sinkv(), !dbg !20
>>>>>> + tail call void @_Z6commonv(), !dbg !22
>>>>>> + br label %_Z8wrapper2v.exit, !dbg !25
>>>>>> +
>>>>>> +if.else.i: ; preds = %entry
>>>>>> + tail call void @_Z6commonv(), !dbg !26
>>>>>> + br label %_Z8wrapper2v.exit
>>>>>> +
>>>>>> +_Z8wrapper2v.exit: ; preds =
>>>>>> %if.then.i, %if.else.i
>>>>>> + ret void, !dbg !28
>>>>>> +}
>>>>>> +
>>>>>> +declare dso_local void @_Z4sinkv() local_unnamed_addr
>>>>>> +
>>>>>> +declare dso_local void @_Z6commonv() local_unnamed_addr
>>>>>> +
>>>>>> +!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 340559) (llvm/trunk 340572)",
>>>>>> isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2,
>>>>>> nameTableKind: None)
>>>>>> +!1 = !DIFile(filename: "merge_loc.cpp", directory:
>>>>>> "/usr/local/google/home/blaikie/dev/scratch")
>>>>>> +!2 = !{}
>>>>>> +!3 = !{i32 2, !"Dwarf Version", i32 4}
>>>>>> +!4 = !{i32 2, !"Debug Info Version", i32 3}
>>>>>> +!5 = !{i32 1, !"wchar_size", i32 4}
>>>>>> +!6 = !{!"clang version 8.0.0 (trunk 340559) (llvm/trunk 340572)"}
>>>>>> +!7 = distinct !DISubprogram(name: "f1", linkageName: "_Z2f1v",
>>>>>> scope: !1, file: !1, line: 12, type: !8, isLocal: false, isDefinition:
>>>>>> true, scopeLine: 12, flags: DIFlagPrototyped, isOptimized: true, unit: !0,
>>>>>> retainedNodes: !2)
>>>>>> +!8 = !DISubroutineType(types: !9)
>>>>>> +!9 = !{null}
>>>>>> +!10 = !DILocation(line: 6, column: 7, scope: !11, inlinedAt: !13)
>>>>>> +!11 = distinct !DILexicalBlock(scope: !12, file: !1, line: 6,
>>>>>> column: 7)
>>>>>> +!12 = distinct !DISubprogram(name: "wrapper2", linkageName:
>>>>>> "_Z8wrapper2v", scope: !1, file: !1, line: 5, type: !8, isLocal: false,
>>>>>> isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized:
>>>>>> true, unit: !0, retainedNodes: !2)
>>>>>> +!13 = distinct !DILocation(line: 13, column: 3, scope: !7)
>>>>>> +!14 = !{!15, !15, i64 0}
>>>>>> +!15 = !{!"bool", !16, i64 0}
>>>>>> +!16 = !{!"omnipotent char", !17, i64 0}
>>>>>> +!17 = !{!"Simple C++ TBAA"}
>>>>>> +!18 = !{i8 0, i8 2}
>>>>>> +!19 = !DILocation(line: 6, column: 7, scope: !12, inlinedAt: !13)
>>>>>> +!20 = !DILocation(line: 7, column: 5, scope: !21, inlinedAt: !13)
>>>>>> +!21 = distinct !DILexicalBlock(scope: !11, file: !1, line: 6,
>>>>>> column: 10)
>>>>>> +!22 = !DILocation(line: 2, column: 25, scope: !23, inlinedAt: !24)
>>>>>> +!23 = distinct !DISubprogram(name: "wrapper", linkageName:
>>>>>> "_Z7wrapperv", scope: !1, file: !1, line: 2, type: !8, isLocal: false,
>>>>>> isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized:
>>>>>> true, unit: !0, retainedNodes: !2)
>>>>>> +!24 = distinct !DILocation(line: 8, column: 5, scope: !21,
>>>>>> inlinedAt: !13)
>>>>>> +!25 = !DILocation(line: 9, column: 3, scope: !21, inlinedAt: !13)
>>>>>> +!26 = !DILocation(line: 2, column: 25, scope: !23, inlinedAt: !27)
>>>>>> +!27 = distinct !DILocation(line: 10, column: 5, scope: !11,
>>>>>> inlinedAt: !13)
>>>>>> +!28 = !DILocation(line: 14, column: 1, scope: !7)
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> llvm-commits mailing list
>>>>>> llvm-commits at lists.llvm.org
>>>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits
>>>>>>
>>>>>
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