llvm dev - Apr 2012 - [LLVMdev] How to get the module handle of a .bc file??

Hi all,
I want to run a function pass on a certain .bc file. In the process, the pass
will insert a check function into the .bc file.

I know the .bc file is regarded as a module in LLVM. So, there are two basic
steps needed to be done,
1, Use the "getOrInsertFunction"API to add a declaration of the extern
"check function".
2, Use the "insertBefore"API to insert the CallInst into the right
position.

My problem is about the step 1. How can I get the handle of the .bc file
(Probably is a Module*)? so I can
declare the extern function like
// insert the " i32 @fib(i32 )" to the module M
Function *FibF    
cast<Function>(M->getOrInsertFunction("fib",
Type::getInt32Ty(Context),
                                          Type::getInt32Ty(Context),
                                          (Type *)0));
How can I get the "M" of the .bc file??????

Any help~
 

--

            祝好！
 
  甄凯
------------------------------------------------------------------------------------------------------
2012-04-10
------------------------------------------------------------------------------------------------------
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.
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Objects that form the IR (functions, basic blocks, instructions) have
the getParent() method that returns their paren (module for a
function, basic block for a single instruction etc.)
BTW, LLVM Doxygen is really helpful. It's usually the first result
when you search for "LLVM <classname> class reference"

On Tue, Apr 10, 2012 at 11:17 AM, 15102925731 <zhenkaixd at 126.com>
wrote:
>
> Hi all,
> I want to run a function pass on a certain .bc file. In the process, the
> pass will insert a check function into the .bc file.
>
> I know the .bc file is regarded as a module in LLVM. So, there are two
basic
> steps needed to be done,
> 1, Use the "getOrInsertFunction"API to add a declaration of the
extern
> "check function".
> 2, Use the "insertBefore"API to insert the CallInst into the
right position.
>
> My problem is about the step 1. How can I get the handle of the .bc file
> (Probably is a Module*)? so I can
> declare the extern function like
> // insert the " i32 @fib(i32 )" to the module M
> Function *FibF >    
cast<Function>(M->getOrInsertFunction("fib",
Type::getInt32Ty(Context),
>                                           Type::getInt32Ty(Context),
>                                           (Type *)0));
> How can I get the "M" of the .bc file??????
>
> Any help~
>
> --
>             祝好！
>
>   甄凯
>
------------------------------------------------------------------------------------------------------
> 2012-04-10
>
------------------------------------------------------------------------------------------------------
> 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
>


-- 
Alexander Potapenko
Software Engineer
Google Moscow

Oh, I see.
Also, I also tried a module pass(the short source code is as follow). I intended
to run the module pass on the .bc file declaring the check function to the
module's symbol table. Then I go for the function pass to insert the
CallInst instruction. Does that make sense?
Thank you!! 
#include "llvm/Pass.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Module.h"
#include "llvm/Function.h"
#include "llvm/LLVMContext.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Constants.h"
#include "llvm/Instructions.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/ExecutionEngine/JIT.h"
#include "llvm/ExecutionEngine/Interpreter.h"
#include "llvm/ExecutionEngine/GenericValue.h"
#include "llvm/Support/TargetSelect.h"
using namespace llvm;
 
namespace {
  struct Hello2 : public ModulePass {
   
    static char ID;
    Hello2() : ModulePass(ID) {}

    virtual bool runOnModule(Module &M) {
      errs() << "Hello: " << '\n' <<
'\n';
      //errs().write_escaped(F.getName()) << '\n';
Function *check    
cast<Function>(M.getOrInsertFunction("check",
                                          Type::getInt32Ty(M.getContext()),
                                          (Type *)0));
     if(NULL!=M.getFunction("check"))
      errs()<<"declare succeeded!"<<'\n';
      return true;
    }

  };
}


--

            祝好！
 
  甄凯
------------------------------------------------------------------------------------------------------
2012-04-10
------------------------------------------------------------------------------------------------------
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 2012-04-10 15:29:15,"Alexander Potapenko" <glider at
google.com> wrote:
>Objects that form the IR (functions, basic blocks, instructions) have
>the getParent() method that returns their paren (module for a
>function, basic block for a single instruction etc.)
>BTW, LLVM Doxygen is really helpful. It's usually the first result
>when you search for "LLVM <classname> class reference"
>
>On Tue, Apr 10, 2012 at 11:17 AM, 15102925731 <zhenkaixd at 126.com>
wrote:
>>
>> Hi all,
>> I want to run a function pass on a certain .bc file. In the process,
the
>> pass will insert a check function into the .bc file.
>>
>> I know the .bc file is regarded as a module in LLVM. So, there are two
basic
>> steps needed to be done,
>> 1, Use the "getOrInsertFunction"API to add a declaration of
the extern
>> "check function".
>> 2, Use the "insertBefore"API to insert the CallInst into the
right position.
>>
>> My problem is about the step 1. How can I get the handle of the .bc
file
>> (Probably is a Module*)? so I can
>> declare the extern function like
>> // insert the " i32 @fib(i32 )" to the module M
>> Function *FibF >>    
cast<Function>(M->getOrInsertFunction("fib",
Type::getInt32Ty(Context),
>>                                           Type::getInt32Ty(Context),
>>                                           (Type *)0));
>> How can I get the "M" of the .bc file??????
>>
>> Any help~
>>
>> --
>>             祝好！
>>
>>   甄凯
>>
------------------------------------------------------------------------------------------------------
>> 2012-04-10
>>
------------------------------------------------------------------------------------------------------
>> 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
>>
>
>
>
>-- 
>Alexander Potapenko
>Software Engineer
>Google Moscow
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