[llvm-commits] Invalid memory access due to debug info which building gcc

[Duncan Sands]

Hi Devang, if I configure llvm-gcc like this:

  CFLAGS="-O0 -g" ../gcc-4.2.llvm/configure --prefix=... --enable-languages=c,c++,fortran --enable-checking --enable-llvm=... --disable-bootstrap --disable-multilib

then build, the build fails when compiling gcc/unwind-dw2-fde-glibc.c.

Valgrind reports

==3056== Invalid read of size 8                                                                                                               
==3056==    at 0xF1C820: llvm::DwarfDebug::AddType(llvm::CompileUnit*, llvm::DIE*, llvm::DIType) (DwarfWriter.cpp:1702)                       
==3056==    by 0xF1CF5F: llvm::DwarfDebug::ConstructTypeDIE(llvm::CompileUnit*, llvm::DIE&, llvm::DIDerivedType) (DwarfWriter.cpp:1735)       
==3056==    by 0xF1C768: llvm::DwarfDebug::AddType(llvm::CompileUnit*, llvm::DIE*, llvm::DIType) (DwarfWriter.cpp:1694)                       
==3056==    by 0xF23DF7: llvm::DwarfDebug::ConstructGlobalVariableDIEs() (DwarfWriter.cpp:2823)                                               
==3056==    by 0xF24369: llvm::DwarfDebug::SetDebugInfo(llvm::MachineModuleInfo*) (DwarfWriter.cpp:2929)                                      
==3056==    by 0xF06D31: llvm::DwarfWriter::BeginModule(llvm::Module*, llvm::MachineModuleInfo*, llvm::raw_ostream&, llvm::AsmPrinter*, llvm::TargetAsmInfo const*) (DwarfWriter.cpp:4244)                                                                                                  
==3056==    by 0xBD5B45: llvm::X86ATTAsmPrinter::doInitialization(llvm::Module&) (X86ATTAsmPrinter.cpp:739)                                   
==3056==    by 0x11B70C3: llvm::FPPassManager::doInitialization(llvm::Module&) (PassManager.cpp:1356)                                         
==3056==    by 0x11B72DA: llvm::FunctionPassManagerImpl::doInitialization(llvm::Module&) (PassManager.cpp:1250)                               
==3056==    by 0x11AEA54: llvm::FunctionPassManager::doInitialization() (PassManager.cpp:1233)                                                
==3056==    by 0xA04A01: llvm_asm_file_end (llvm-backend.cpp:688)                                                                             
==3056==    by 0x971761: compile_file (toplev.c:1191)                                                                                         
==3056==  Address 0x6fe8480 is 952 bytes inside a block of size 1,024 free'd                                                                  
==3056==    at 0x4C2514D: operator delete(void*) (vg_replace_malloc.c:342)                                                                    
==3056==    by 0xF113EB: llvm::DenseMap<llvm::GlobalVariable*, llvm::DIEntry*, llvm::DenseMapInfo<llvm::GlobalVariable*>, llvm::DenseMapInfo<llvm::DIEntry*> >::grow(unsigned int) (DenseMap.h:424)                                                                                         
==3056==    by 0xF1145D: llvm::DenseMap<llvm::GlobalVariable*, llvm::DIEntry*, llvm::DenseMapInfo<llvm::GlobalVariable*>, llvm::DenseMapInfo<llvm::DIEntry*> >::InsertIntoBucket(llvm::GlobalVariable* const&, llvm::DIEntry* const&, std::pair<llvm::GlobalVariable*, llvm::DIEntry*>*) (DenseMap.h:306)                                                                                                                                 
==3056==    by 0xF11539: llvm::DenseMap<llvm::GlobalVariable*, llvm::DIEntry*, llvm::DenseMapInfo<llvm::GlobalVariable*>, llvm::DenseMapInfo<llvm::DIEntry*> >::FindAndConstruct(llvm::GlobalVariable* const&) (DenseMap.h:249)                                                             
==3056==    by 0xF11560: llvm::DenseMap<llvm::GlobalVariable*, llvm::DIEntry*, llvm::DenseMapInfo<llvm::GlobalVariable*>, llvm::DenseMapInfo<llvm::DIEntry*> >::operator[](llvm::GlobalVariable* const&) (DenseMap.h:253)                                                                   
==3056==    by 0xF11588: llvm::CompileUnit::getDIEntrySlotFor(llvm::GlobalVariable*) (DwarfWriter.cpp:839)                                    
==3056==    by 0xF1C634: llvm::DwarfDebug::AddType(llvm::CompileUnit*, llvm::DIE*, llvm::DIType) (DwarfWriter.cpp:1679)                       
==3056==    by 0xF1D653: llvm::DwarfDebug::ConstructFieldTypeDIE(llvm::CompileUnit*, llvm::DIE&, llvm::DIDerivedType) (DwarfWriter.cpp:1950)  
==3056==    by 0xF1DB29: llvm::DwarfDebug::ConstructTypeDIE(llvm::CompileUnit*, llvm::DIE&, llvm::DICompositeType) (DwarfWriter.cpp:1810)     
==3056==    by 0xF1C7D7: llvm::DwarfDebug::AddType(llvm::CompileUnit*, llvm::DIE*, llvm::DIType) (DwarfWriter.cpp:1697)                       
==3056==    by 0xF1CF5F: llvm::DwarfDebug::ConstructTypeDIE(llvm::CompileUnit*, llvm::DIE&, llvm::DIDerivedType) (DwarfWriter.cpp:1735)       
==3056==    by 0xF1C768: llvm::DwarfDebug::AddType(llvm::CompileUnit*, llvm::DIE*, llvm::DIType) (DwarfWriter.cpp:1694)                   

and so on.

Ciao,

Duncan.