[LLVMdev] One question about two passes interaction

[Robert Sandra]

Actually I tried ModulePass. It works exactly as what I expect.But I
found another problem. In ModulePass, it not only collects the
functions I create, it also treat some system function such as
'printf' as a function. I do not if I does something wrong. The codes
I use is as follows:

 virtual bool runOnModule(Module &M) {

    	for (Module::iterator b = M.begin(), be = M.end(); b != be; ++b) {

    		Function *ff = dyn_cast<Function>(b);

    		errs() <<"testff0: "<<funcname_index<<'\n';

    		funcname[funcname_index++] = ff->getName();

    	}

    	return false;

  }


My test source file:


void A(){}

void B(){printf("dada");}

void main(){A(); B();}


The ModulePass output is:

A

B

printf

main



Thanks.

Robert




---------------------------------------------------------------------------

Hi Robert,

Function passes are expected to have local behavior that can be scheduled
on a per-function basis in no particular order. To get the behavior you
want, you probably want to make "FunctionPass1" a Module pass and have it
iterate through all of the functions in the module.

You can find more information about passes and how to choose a type of pass
in the llvm documentation at http://llvm.org/docs/WritingAnLLVMPass.html.

Cheers,
Scott


On Sat, Feb 23, 2013 at 1:37 AM, Robert Sandra
<robert.sandra0712 at gmail.com
<http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev>>wrote:

>* Hi all,*>**>* I am trying to run a case as follows:*>**>* FunctionPass1:  try to get all function's names and store them to a global*>* array*>* FunctionPass2:  get information from the global array*>* In FunctionPass2, I use getAnalysisUsage() to set that to run*>* FunctionPass2, FunctionPass1 should be executed first.*>**>* But according to the running result, I found that these two passes are*>* executing at the same time,*>* which means After FunctionPass1 iterate one function, then FunctionPass2*>* will be executed to iterate one function; then FunctionPass1 continues to*>* run, and then FunctionPass2....*>**>* While, what I expected is that the FunctionPass1 will complete first, then*>* FunctionPass2 will be executed. Am I understanding wrong?*>**>* Thanks.*>* Robert*>**>* _______________________________________________*>* LLVM Developers mailing list*>* LLVMdev at cs.uiuc.edu <http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev>         http://llvm.cs.uiuc.edu*>* http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev*>**>
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