[llvm-dev] Parsing a bit code file

[Krzysztof Parzyszek via llvm-dev]

Change
   Module *m = parseIRFile("hello.bc", error, context).get();
to
   std::unique_ptr<Module> m = parseIRFile("hello.bc", error, context);

Otherwise the unique_ptr can be deleted before the call to "dump" (which 
would delete the module as well).

-Krzysztof


On 2/23/2018 6:16 PM, Buddhika Chamith Kahawitage Don via llvm-dev wrote:
> I am trying to parse LLVM IR from a bit code file. I went through the 
> following steps.
> 
> hello.cpp
> 
> |#include<iostream>intmain(){std::cout <<"Hello world!"<<"\n";return0;}|
> 
> dump.cpp
> 
> |#include<llvm/IR/Module.h>#include<llvm/IRReader/IRReader.h>#include<llvm/IR/LLVMContext.h>#include<llvm/Support/SourceMgr.h>usingnamespacellvm;intmain(){LLVMContextcontext;SMDiagnosticerror;Module*m 
> =parseIRFile("hello.bc",error,context).get();if(m){m->dump();}return0;}|
> 
> *$ clang++ -S -O3 -emit-llvm hello.cpp -c -o hello.bc*
> 
> *$ clang++ -g -O3 dump.cpp `|llvm-config --cxxflags --ldflags 
> --system-libs --libs all`|-o dump*
> 
> *$ ./dump*
> 
> But I am getting a segmentation fault as given below. What may be 
> causing this? I am on llvm-6.0 rc2.
> 
>     * thread #1, queue = 'com.apple.main-thread', stop reason = signal
>     SIGABRT
>        * frame #0: 0x00007fff71902e3e
>     libsystem_kernel.dylib`__pthread_kill + 10
>          frame #1: 0x00007fff71a41150
>     libsystem_pthread.dylib`pthread_kill + 333
>          frame #2: 0x00007fff7185f312 libsystem_c.dylib`abort + 127
>          frame #3: 0x00007fff71827368 libsystem_c.dylib`__assert_rtn + 320
>          frame #4: 0x0000000100477eb9
>     dump`llvm::isa_impl_cl<llvm::PointerType, llvm::Type
>     const*>::doit(Val=0x0000000000000000) at Casting.h:106
>          frame #5: 0x0000000100477e28
>     dump`llvm::isa_impl_wrap<llvm::PointerType, llvm::Type const*,
>     llvm::Type const*>::doit(Val=0x00007ffeefbfee20) at Casting.h:133
>          frame #6: 0x0000000100477e02
>     dump`llvm::isa_impl_wrap<llvm::PointerType, llvm::Type* const,
>     llvm::Type const*>::doit(Val=0x00007ffeefbfee68) at Casting.h:123
>          frame #7: 0x0000000100477db5 dump`bool
>     llvm::isa<llvm::PointerType, llvm::Type*>(Val=0x00007ffeefbfee68) at
>     Casting.h:143
>          frame #8: 0x0000000100477d18
>     dump`llvm::cast_retty<llvm::PointerType, llvm::Type*>::ret_type
>     llvm::cast<llvm::PointerType, llvm::Type>(Val=0x0000000000000000) at
>     Casting.h:255
>          frame #9: 0x000000010047227d
>     dump`llvm::GlobalValue::getType(this=0x00000001013ffff6) const at
>     GlobalValue.h:265
>          frame #10: 0x00000001004bad34
>     dump`llvm::TypeFinder::run(this=0x00007ffeefbff530,
>     M=0x0000000101401e80, onlyNamed=false) at TypeFinder.cpp:38
>          frame #11: 0x00000001001a97c9 dump`(anonymous
>     namespace)::TypePrinting::incorporateTypes(this=0x00007ffeefbff530,
>     M=0x0000000101401e80) at AsmWriter.cpp:491
>          frame #12: 0x00000001001a964f dump`(anonymous
>     namespace)::AssemblyWriter::AssemblyWriter(this=0x00007ffeefbff510,
>     o=0x00007ffeefbff3f8, Mac=0x00007ffeefbff438, M=0x0000000101401e80,
>     AAW=0x0000000000000000, IsForDebug=true,
>     ShouldPreserveUseListOrder=false) at AsmWriter.cpp:2210
>          frame #13: 0x000000010019ce22 dump`(anonymous
>     namespace)::AssemblyWriter::AssemblyWriter(this=0x00007ffeefbff510,
>     o=0x00007ffeefbff3f8, Mac=0x00007ffeefbff438, M=0x0000000101401e80,
>     AAW=0x0000000000000000, IsForDebug=true,
>     ShouldPreserveUseListOrder=false) at AsmWriter.cpp:2207
>          frame #14: 0x000000010019e3e3
>     dump`llvm::Module::print(this=0x0000000101401e80,
>     ROS=0x00000001007d1a70, AAW=0x0000000000000000,
>     ShouldPreserveUseListOrder=false, IsForDebug=true) const at
>     AsmWriter.cpp:3415
>          frame #15: 0x00000001001a77e1
>     dump`llvm::Module::dump(this=0x0000000101401e80) const at
>     AsmWriter.cpp:3650
>          frame #16: 0x000000010000250e dump`main at dump.cpp:17 [opt]
>          frame #17: 0x00007fff717b3115 libdyld.dylib`start + 1
> 
> 
> Thanks
> 
> Buddhika
> 
> 
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