[LLVMdev] How to instrument a this function using insertBefore instruction???
Joey Gouly
joel.gouly at gmail.com
Mon Apr 9 02:56:05 PDT 2012
That sounds like a good general plan, yes!
Joey
2012/4/9 15102925731 <zhenkaixd at 126.com>
> Thank you very much!
>
> To make it simpler, I may as well just implement the self-written "check
> function" in C language instead of wrapping it in LLVM module. *According
> to the hint you give me, all I need to do is as follow(?)*
>
> 1. Implement the "Check function" in the check.c file;
> 2. Add the check function into the module(the Hello1.bc file which I will
> run the functionPass on) in the functionPass file.
> 3. Determine the exact position and insert the CallInst instruction to
> call that check function. (already done as is shown in the source code).
> 4. gmake and use the opt tool to generate the instrumented
> module(Hello2.bc).
> 5. Link the check.c file and Hello2.bc file together to generate ELF file.
>
> *does that make sense?*
>
>
>
>
> --
> 祝好！
>
> 甄凯
>
> ------------------------------------------------------------------------------------------------------
> 2012-04-09
>
> ------------------------------------------------------------------------------------------------------
> Name: 甄凯(ZhenKai)
> Homepage:http://www.renren.com/262729393
> Email: zhenkaixd at 126.com or 846227103 at qq.com
> TEL: 15810729006(Beijing)
> Address: Room I-406, Central Building, Tsinghua University, Beijing,
> China. 100084.
>
> At 2012-04-09 17:16:52,"Joey Gouly" <joel.gouly at gmail.com> wrote:
>
> Hi,
>
> I don't think the code you pasted can be the correct code, where does FibF
> come from?
>
> Anyway, the problem is that you're calling the FibF from Module A, however
> you defined it for Module B.
>
> You need to insert the FibF function into the Module that you're running.
> To do this override "virtual bool doInitialization(Module &M);" and insert
> FibF into M.
>
> Joey
>
> 2012/4/9 15102925731 <zhenkaixd at 126.com>
>
>> Hi,
>> I got upset.. What does “Broken module found, compilation aborted!” mean
>> really?? what‘s “broken module“??
>>
>>
>>
>> --
>> 祝好！
>>
>> 甄凯
>>
>> ------------------------------------------------------------------------------------------------------
>> 2012-04-09
>>
>> ------------------------------------------------------------------------------------------------------
>> Name: 甄凯(ZhenKai)
>> Homepage:http://www.renren.com/262729393
>> Email: zhenkaixd at 126.com or 846227103 at qq.com
>> TEL: 15810729006(Beijing)
>> Address: Room I-406, Central Building, Tsinghua University, Beijing,
>> China. 100084.
>>
>> 在 2012-04-09 15:50:00，15102925731 <zhenkaixd at 126.com> 写道：
>>
>> Hi all，
>> Im trying to instrument this hello function right before the instruction
>> that call the "puts" function(the source code is as follow).
>>
>> Now I can compile the pass without errors, but when run the pass with opt
>> tool, it broke down. The diagnose is something like
>>
>> Referencing function in another module!
>> %CallCheck = call i32 @fib()
>> Broken module found, compilation aborted!
>>
>> Does it mean I fail to wrap the function into a module?? How to actually
>> insert the the "hello function" before the calling instruction ?? Im
>> waiting for your help.
>> Thank you!!
>>
>>
>> //******=========================================================================================================================================******//
>> //******=========================================================================================================================================******////
>> FPSFI: a Function Pass Based Idea for Software Fault Isolation
>> //
>> //
>> //This file involves the main work of SFI. It will source the certain
>> point in any programme(mainly modules in our context)and insert our manully
>> made//
>> //check function to provide API integrity. Thanks to the pass mechanism
>> that LLVM provide, we can wrap our fix and optimization idea into a
>> function pass
>> // and act it on every function the clang has analysed.
>> //
>>
>> //******=========================================================================================================================================******//
>>
>> //******=========================================================================================================================================******//
>> #include "llvm/Pass.h"
>> #include "llvm/Function.h"
>> #include "llvm/Support/raw_ostream.h"
>> #include "llvm/Instruction.h"
>> #include "llvm/Transforms/Utils/UnrollLoop.h"
>> #include "llvm/BasicBlock.h"
>> #include "llvm/ADT/Statistic.h"
>> #include "llvm/Analysis/LoopIterator.h"
>> #include "llvm/Analysis/LoopPass.h"
>> #include "llvm/Analysis/ScalarEvolution.h"
>> #include "llvm/Analysis/ScalarEvolutionExpander.h"
>> #include "llvm/Support/Debug.h"
>> #include "llvm/Transforms/Utils/BasicBlockUtils.h"
>> #include "llvm/Transforms/Utils/Cloning.h"
>> #include "llvm/Type.h"
>> #include "llvm/LLVMContext.h"
>> #include "llvm/Support/Casting.h"
>> #include "stdio.h"
>>
>> #include "llvm/Module.h"
>> using namespace llvm;
>>
>>
>> int check()
>> {
>> printf("Hello me!!\n");
>> return 0;
>> }
>>
>>
>>
>> Module * M;
>> LLVMContext Context;
>> FunctionType *STy=FunctionType::get(Type::getInt32Ty(Context), false);
>> Function *check = Function::Create(STy, Function::InternalLinkage,
>> "check" ,&M);
>>
>> CallInst *callcheck = CallInst::Create(FibF,"CallCheck");
>>
>> namespace {
>>
>> struct Hello : public FunctionPass
>> {
>>
>> static char ID;
>> Hello() : FunctionPass(ID) {}
>> virtual bool runOnFunction(Function &F)
>> {
>> errs() << "Hello: ";
>> errs().write_escaped(F.getName())
>> <<'\n';
>> // run through all the instruction and convert all the callinst to ...
>> for (Function::iterator BI = F.begin(), BE =
>> F.end(); BI != BE; ++BI)
>> {
>> for(BasicBlock::iterator II =
>> BI->begin(),IE = BI->end();II != IE; ++II)
>> {
>> // errs() <<"between instructions!
>> \n";
>> // CallInst * III =
>> CallInst::Create(&F,"InsttoCallInst",II);
>> if(CallInst * III =
>> dyn_cast<CallInst>(II))
>> {
>>
>>
>> if(III->getCalledFunction()!=NULL&&III->getCalledFunction()->getName()=="puts")
>> {
>> errs()
>> <<III->getCalledFunction()->getName()<<" function found!\n";
>>
>> callcheck->insertBefore(II);
>> errs() <<"INSERT
>> SUCCEEDED!!!!!!!!\n";
>> }
>> else
>> {
>> errs() <<"it's not main
>> function!\n"<<"it is:"<<III->getCalledFunction()->getName()<<'\n';
>> }
>> }/**/
>> }
>>
>> }
>>
>> }
>> return true;
>> }
>> };
>> }
>>
>> char Hello::ID = 0;
>> static RegisterPass<Hello> X("hello", "ZHello Korld Pass", false, false);
>>
>> --
>> 祝好！
>>
>> 甄凯
>>
>> ------------------------------------------------------------------------------------------------------
>> 2012-04-09
>>
>> ------------------------------------------------------------------------------------------------------
>> Name: 甄凯(ZhenKai)
>> Homepage:http://www.renren.com/262729393
>> Email: zhenkaixd at 126.com or 846227103 at qq.com
>> TEL: 15810729006(Beijing)
>> Address: Room I-406, Central Building, Tsinghua University, Beijing,
>> China. 100084.
>>
>>
>>
>>
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>>
>
>
>
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