[LLVMdev] Debug Info Slowing Things Down?!

Bill Wendling isanbard at gmail.com
Sun Nov 17 18:04:53 PST 2013 

I think it might be. I’m attaching a preprocessed file that can show the problem. Compile it with ToT.

$ clang++ -g -fvisibility-inlines-hidden -fno-exceptions -fno-rtti -fno-common -Woverloaded-virtual -Wcast-qual -fno-strict-aliasing -m64 -pedantic -Wno-long-long -Wall -W -Wno-unused-parameter -Wwrite-strings  -Wcovered-switch-default -Wno-uninitialized  -Wno-missing-field-initializers -c LLVMTidyModule.ii

-bw

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On Nov 17, 2013, at 6:01 PM, Manman Ren <mren at apple.com> wrote:

> Hi Bill
> 
> Is this a recent regression? I recently changed the debug info verifier to fix a bug.
> 
> Thanks,
> Manman
> 
>> On Nov 17, 2013, at 5:52 PM, Bill Wendling <isanbard at gmail.com> wrote:
>> 
>> I think that debug info is slowing a self-hosting build down. This build has been going for ages now and shows no sign of quitting. To reproduce, build a Release+Asserts build of clang. Then use that to build a Debug+Asserts version. Include all of the bells and whistles, like the clang-extras and compiler-rt libraries.
>> 
>> The reason I suspect debug info is because of this stack trace:
>> 
>> [morbo:llvm] lldb -p 92084
>> Attaching to process with:
>>   process attach -p 92084
>> Process 92084 stopped
>> Executable module set to "/Users/morbo/llvm/llvm-clean.obj/Release+Asserts/bin/clang".
>> Architecture set to: x86_64-apple-macosx.
>> (lldb) bt
>> * thread #1: tid = 0xbebaf, 0x000000010c5f6dc1 clang`llvm::SmallPtrSetImpl::insert_imp(void const*) + 161, queue = 'com.apple.main-thread, stop reason = signal SIGSTOP
>>   frame #0: 0x000000010c5f6dc1 clang`llvm::SmallPtrSetImpl::insert_imp(void const*) + 161
>>   frame #1: 0x000000010c5147df clang`llvm::DebugInfoFinder::processSubprogram(llvm::DISubprogram) + 47
>>   frame #2: 0x000000010c514701 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 817
>>   frame #3: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #4: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #5: 0x000000010c5148c4 clang`llvm::DebugInfoFinder::processSubprogram(llvm::DISubprogram) + 276
>>   frame #6: 0x000000010c514701 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 817
>>   frame #7: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #8: 0x000000010c5148c4 clang`llvm::DebugInfoFinder::processSubprogram(llvm::DISubprogram) + 276
>>   frame #9: 0x000000010c514701 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 817
>>   frame #10: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #11: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #12: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #13: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #14: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #15: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #16: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #17: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #18: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #19: 0x000000010c5148c4 clang`llvm::DebugInfoFinder::processSubprogram(llvm::DISubprogram) + 276
>>   frame #20: 0x000000010c514701 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 817
>>   frame #21: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #22: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #23: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #24: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #25: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #26: 0x000000010c5148c4 clang`llvm::DebugInfoFinder::processSubprogram(llvm::DISubprogram) + 276
>>   frame #27: 0x000000010c514701 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 817
>>   frame #28: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #29: 0x000000010c5148c4 clang`llvm::DebugInfoFinder::processSubprogram(llvm::DISubprogram) + 276
>>   frame #30: 0x000000010c514701 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 817
>>   frame #31: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #32: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #33: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #34: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #35: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #36: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #37: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #38: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #39: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #40: 0x000000010c5148c4 clang`llvm::DebugInfoFinder::processSubprogram(llvm::DISubprogram) + 276
>>   frame #41: 0x000000010c514701 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 817
>>   frame #42: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #43: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #44: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #45: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #46: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #47: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #48: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #49: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #50: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #51: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #52: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #53: 0x000000010c5148c4 clang`llvm::DebugInfoFinder::processSubprogram(llvm::DISubprogram) + 276
>>   frame #54: 0x000000010c514701 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 817
>>   frame #55: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #56: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #57: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #58: 0x000000010c5145f3 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 547
>>   frame #59: 0x000000010c514695 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 709
>>   frame #60: 0x000000010c5148c4 clang`llvm::DebugInfoFinder::processSubprogram(llvm::DISubprogram) + 276
>>   frame #61: 0x000000010c514701 clang`llvm::DebugInfoFinder::processType(llvm::DIType) + 817
>>   frame #62: 0x000000010c5140e2 clang`llvm::DebugInfoFinder::processScope(llvm::DIScope) + 50
>>   frame #63: 0x000000010c514895 clang`llvm::DebugInfoFinder::processSubprogram(llvm::DISubprogram) + 229
>>   frame #64: 0x000000010c5141e2 clang`llvm::DebugInfoFinder::processScope(llvm::DIScope) + 306
>>   frame #65: 0x000000010c514cdb clang`llvm::DebugInfoFinder::processLocation(llvm::Module const&, llvm::DILocation) + 91
>>   frame #66: 0x000000010c5af3d6 clang`(anonymous namespace)::Verifier::visitInstruction(llvm::Instruction&) + 2278
>>   frame #67: 0x000000010c5b0bc1 clang`(anonymous namespace)::Verifier::VerifyCallSite(llvm::CallSite) + 1489
>>   frame #68: 0x000000010c5af949 clang`(anonymous namespace)::Verifier::visitCallInst(llvm::CallInst&) + 73
>>   frame #69: 0x000000010c5adbea clang`llvm::InstVisitor<(anonymous namespace)::Verifier, void>::visit(llvm::Instruction&) + 10058
>>   frame #70: 0x000000010c5aa56b clang`(anonymous namespace)::Verifier::runOnFunction(llvm::Function&) + 1611
>>   frame #71: 0x000000010c58963b clang`llvm::FPPassManager::runOnFunction(llvm::Function&) + 347
>>   frame #72: 0x000000010c588e4b clang`llvm::legacy::FunctionPassManagerImpl::run(llvm::Function&) + 235
>>   frame #73: 0x000000010c588d26 clang`llvm::legacy::FunctionPassManager::run(llvm::Function&) + 86
>>   frame #74: 0x000000010ad490f4 clang`clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) + 5492
>>   frame #75: 0x000000010ae47b45 clang`clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) + 453
>>   frame #76: 0x000000010ae99764 clang`clang::ParseAST(clang::Sema&, bool, bool) + 516
>>   frame #77: 0x000000010ae469da clang`clang::CodeGenAction::ExecuteAction() + 122
>>   frame #78: 0x000000010abf3e66 clang`clang::FrontendAction::Execute() + 134
>>   frame #79: 0x000000010abcf70d clang`clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 973
>>   frame #80: 0x000000010ab97a44 clang`clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 4276
>>   frame #81: 0x000000010ab8f843 clang`cc1_main(char const**, char const**, char const*, void*) + 835
>>   frame #82: 0x000000010ab93d52 clang`main + 1138
>>   frame #83: 0x00007fff910165fd libdyld.dylib`start + 1
>>   frame #84: 0x00007fff910165fd libdyld.dylib`start + 1
>> (lldb) 
>> 
>> This is the command:
>> 
>> morbo           92084 100.0  2.3  2888888 380520 s002  R+    5:47PM   1:10.64 /Users/morbo/llvm/llvm-clean.obj/Release+Asserts/bin/clang -cc1 -triple x86_64-apple-macosx10.9.0 -emit-obj -mrelax-all -disable-free -main-file-name LLVMTidyModule.cpp -mrelocation-model pic -pic-level 2 -mdisable-fp-elim -relaxed-aliasing -masm-verbose -munwind-tables -target-cpu core2 -target-linker-version 136 -gdwarf-2 -coverage-file /Users/morbo/llvm/llvm.obj/tools/clang/tools/extra/clang-tidy/llvm/Debug+Asserts/LLVMTidyModule.o -resource-dir /Users/morbo/llvm/llvm-clean.obj/Release+Asserts/bin/../lib/clang/3.4 -dependency-file /Users/morbo/llvm/llvm.obj/tools/clang/tools/extra/clang-tidy/llvm/Debug+Asserts/LLVMTidyModule.d.tmp -MP -MT /Users/morbo/llvm/llvm.obj/tools/clang/tools/extra/clang-tidy/llvm/Debug+Asserts/LLVMTidyModule.o -MT /Users/morbo/llvm/llvm.obj/tools/clang/tools/extra/clang-tidy/llvm/Debug+Asserts/LLVMTidyModule.d -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_!
>> FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /Users/morbo/llvm/llvm.obj/include -I /Users/morbo/llvm/llvm.obj/tools/clang/tools/extra/clang-tidy/llvm -I /Users/morbo/llvm/llvm.src/include -I /Users/morbo/llvm/llvm.src/tools/clang/tools/extra/clang-tidy/llvm -I /Users/morbo/llvm/llvm.src/tools/clang/tools/extra/clang-tidy/llvm/../../../../include -I /Users/morbo/llvm/llvm.obj/tools/clang/tools/extra/clang-tidy/llvm/../../../../include -I /Users/morbo/llvm/llvm-clean.install/lib/c++/v1 -stdlib=libc++ -Woverloaded-virtual -Wcast-qual -Wno-long-long -Wall -W -Wno-unused-parameter -Wwrite-strings -Wcovered-switch-default -Wno-uninitialized -Wno-missing-field-initializers -pedantic -fdeprecated-macro -fdebug-compilation-dir /Users/morbo/llvm/llvm.obj/tools/clang/tools/extra/clang-tidy/llvm -ferror-limit 19 -fmessage-length 191 -fvisibility-inlines-hidden -stack-protector 1 -mstackrealign -fblocks -fno-rtti -fobjc-runtime=macosx-10.9.0 -fencode-extended-block-signature -fno-common -fdi!
>> agnostics-show-option -fcolor-diagnostics -vectorize-slp -o /Users/morbo/llvm/llvm.obj/tools/clang/tools/extra/clang-tidy/llvm/Debug+Asserts/LLVMTidyModule.o -x c++ /Users/morbo/llvm/llvm.src/tools/clang/tools/extra/clang-tidy/llvm/LLVMTidyModule.cpp
>> 
>> 
>> -bw
>> 
>> 
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