llvm dev - Dec 2012 - [LLVMdev] how to get and modify a global variable inside a module

hi Eduardo,
thanks for your attention, i checked the iterator, but i didn't see any
fucntion can return or modify the main memory address of a global variable
inside the module. 
can you provide some reference code or program can achieve this?
thank you very much



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Hi Dong Chen,
I realized you are actually executing the IR, right? I am not sure if
the things I mentioned apply in that case. Actually, I wrote a
optimization pass that modify the IR. It modifies global variables and
the final IR is intended to be compiled.
A snippet of what I do looks like this:

class TestClass : public llvm::ModulePass {
public:
  TestClass() : llvm::ModulePass(TestClass::ID) { }
  virtual bool runOnModule(llvm::Module &m) {
	  for (llvm::Module::global_iterator ii = m.global_begin();
			  ii != m.global_end(); ++ii) {
		  GlobalVariable* gv = ii;
// here you can modify the gv variable (actually I am creating new
globals and deleting the old ones)
	      for (llvm::Value::use_iterator jj = gv->use_begin();
	           jj != gv->use_end(); ++jj) {
// jj is a reference for the user of the global variable
	      }
	  }
  }
}

On Wed, Dec 5, 2012 at 11:37 AM, Dong Chen <jameschennerd at gmail.com>
wrote:
> hi Eduardo,
> thanks for your attention, i checked the iterator, but i didn't see any
> fucntion can return or modify the main memory address of a global variable
> inside the module.
> can you provide some reference code or program can achieve this?
> thank you very much
>
>
>
> --
> View this message in context:
http://llvm.1065342.n5.nabble.com/how-to-get-and-modify-a-global-variable-inside-a-module-tp52289p52294.html
> Sent from the LLVM - Dev mailing list archive at Nabble.com.
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

hi Eduardo,
i got what you did, but it seemed that you modified the Global Variable
list, deleted Global Variable and created new one and added it to the list.
I don't know whether i got it right and for more details, can you get the
main memory address of the Global Variable? or did the iterator provide
method to get this?

thank you very much 



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