Buddhika Chamith Kahawitage Don via llvm-dev
2018-Feb-24 00:16 UTC
[llvm-dev] Parsing a bit code file
I am trying to parse LLVM IR from a bit code file. I went through the
following steps.
hello.cpp
#include <iostream>
int main() {
std::cout << "Hello world!" << "\n";
return 0;}
dump.cpp
#include <llvm/IR/Module.h>#include
<llvm/IRReader/IRReader.h>#include
<llvm/IR/LLVMContext.h>#include <llvm/Support/SourceMgr.h>
using namespace llvm;int main(){
LLVMContext context;
SMDiagnostic error;
Module *m = parseIRFile("hello.bc", error, context).get();
if(m)
{
m->dump();
}
return 0;}
*$ 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
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20180223/de752a6b/attachment.html>
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
>
>
>
<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>
> Virus-free. www.avg.com
>
<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>
>
>
> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>