[LLVMdev] Variable name from metadata

[Devang Patel]

Pankaj,

You could simply do

	if (const CallInst *CI = dyn_cast<CallInst>(Insn))
		if (const DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(Insn)) {
			DIVariable DV = DDI->getVariable();
			StringRef VarName = DV.getName();
	}
	
Now, StringRef has various operators so you could most likely use it directly.
-
Devang
	

On Oct 17, 2011, at 5:47 AM, Pankaj Gode wrote:

> Closing this, found below links to get variable name.
>  
> http://groups.google.com/group/llvm-dev/browse_thread/thread/1a239f0d24db2b5c
>  
> http://markmail.org/message/fj5qg44vyjsdde7k#query:+page:1+mid:5zhmyncisenomcga+state:results
>  
>         I could do following, to get the required information.
>                 const CallInst *CI = dyn_cast<CallInst>(Insn);
>                 int numoperands = CI->getNumArgOperands();
>                 for( unsigned i = 0; i != numoperands; ++i)
>                 {
>                   Value *v = CI->getOperand(i);
>                   MDNode *temp = (MDNode *)CI->getOperand(1) ;
>                   DIVariable DV(temp);//TO CHECK. remove later
>                   StringRef varName = DV.getName();
>                   const char *tmpvarname = varName.data();
>                   if( i == 1) //points to metadata for variable name
>                   {
>  
> Sorry for posting trivial question.
>  
> Regards,
> Pankaj
>  
> 
> From: Pankaj Gode <godepankaj at yahoo.com>
> To: llvm Developers <llvmdev at cs.uiuc.edu>
> Sent: Monday, October 17, 2011 5:38 PM
> Subject: [LLVMdev] Variable name from metadata
> 
> Hi All,
>  
> Can we extract name of variable name from "MDNode" ?
>  
> 1. Neither temp_MDNode->getName() nor temp_MDNode->getValueName() give me "global_int" which is name of a variable.
>  
> 2. I tried below ways as well.
> DIVariable DV(mdnode1);
> Value *v = mdnode1->getOperand(0);//gives add 0x69
>  
> 3. I have written below code to reach till variable name.
>  
>      LLVMIname is
>  
>               const CallInst *CI = dyn_cast<CallInst>(Insn);
>               const Value* LLVMIValue  = cast<CallInst>(Insn)->getCalledValue();
>               const Function *LLVMIFunc= dyn_cast<Function>(LLVMIValue);
>              
>               if( LLVMIname.compare("llvm.dbg.declare") == 0 )
>                             {
>                                int x = 0;
>                 int numoperands = CI->getNumArgOperands();
>                 for( unsigned i = 0; i != numoperands; ++i)
>                 {
>                   Value *v = CI->getOperand(i);
>                   if( i == 1) //points to metadata for variable name
>                   {
>                     MDNode *mdnode = (MDNode *)CI->getOperand(1);
>                      int numoperds= mdnode->getNumOperands();//4 operands
>                      for( unsigned x = 0; x != numoperds; ++x)
>                      {
>                         Value *v = mdnode->getOperand(x);
>                         if( x == 2)//name of variable
>                         {
>                            MDNode *mdnode1 = (MDNode *)mdnode->getOperand(2);//mdnode1->dump() gives variable name.
>                            std::pair<unsigned, MDNode *> mynode( Insn->getDebugLoc().getLine(), mdnode1);
>                            linenum_varmdnode.push_back( mynode);
>                        
>                            //DIVariable DV(mdnode1);//not working
>                            //Value *v = mdnode1->getOperand(0);//, not working. gives add 0x69
>                                                }
>                      }//for operands mdnode
>                   }                  
>                 }//for operands mdnode
> 3. When I give "temp_MDNode->dump()" on gdb, it displays below output ==> 
> metadata !"global_int"
> If I can collect this in a string, that too is OK for me.
>  
>  
> Thanks & Regards,
> Pankaj
>  
> 
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