[llvm] r340583 - DebugInfo: Improve debug location merging
Reid Kleckner via llvm-commits
llvm-commits at lists.llvm.org
Tue Aug 28 10:37:15 PDT 2018
CReduce produced:
typedef long a;
void __declspec(noreturn) b(char *, int, char *, a, a);
class c {
public:
char &operator[](long d) {
long e = 0, f(g);
if (f)
b("", 0, "", e, f);
return h[d];
}
char *h;
long g;
};
class i : public c {
public:
i(long);
};
class j : i {
public:
j(long d) : i(d) { (*this)[0] = '\0'; }
void k() { (*this)[0]; }
};
void l() {
j m(8);
m.k();
}
void n() {}
Compile with:
clang --target=i686-windows-msvc t.cpp -g -gcodeview -O2 -c
We could revert, but ultimately this is a pre-existing issue in the .cv_loc
implementation in MC. I'll try to fix that today.
On Tue, Aug 28, 2018 at 10:27 AM David Blaikie <dblaikie at gmail.com> wrote:
> Yeah, if anyone's seeing failures - I'm all ears for repro steps.
>
> On Mon, Aug 27, 2018 at 10:59 PM <douglas.yung at sony.com> wrote:
>
>> Is a repro still needed for this issue? Several of our internal tests
>> have also hit an assertion failure that started with this commit.
>>
>>
>>
>> Douglas Yung
>>
>>
>>
>> *From:* llvm-commits [mailto:llvm-commits-bounces at lists.llvm.org] *On
>> Behalf Of *David Blaikie via llvm-commits
>> *Sent:* Monday, August 27, 2018 18:43
>> *To:* Reid Kleckner
>> *Cc:* llvm-commits
>> *Subject:* Re: [llvm] r340583 - DebugInfo: Improve debug location merging
>>
>>
>>
>>
>>
>> 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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