help:how to get the Nth argument stmt from CALL_EXPR stmt tree

[Daniel Berlin]

On Wed, 2005-07-06 at 23:30 +0800, alert7 wrote:
> Daniel Berlin,您好！
> 
>     I'am gcc beginner,thank your answer .
> 
> 	Is it the return Value of GetCallArgOperand function that u given stmt tree?

No.

>    
>     I pass return value--ops to   function FOR_EACH_SSA_TREE_OPERAND
> 	FOR_EACH_SSA_TREE_OPERAND (use, ops, iter, SSA_OP_ALL_USES)        {
> 
> 	}
> 	

That won't work, because ops is not a statement tree.

>     but ,at runtime ,FOR_EACH_SSA_TREE_OPERAND report internal compiler error: in stmt_ann, at tree-flow-inline.h:55  .
> 	
> 	what happen? Maybe there is another problem.how to fix it?
> 
> 	
> 	Maybe My really problem is How to get stmt tree from a common tree value.

i'm not sure i understand.

do you want to get, given

a_5 = 69
foo(a_5)

the a_5 = 69 part?
Or a pointer a_5 inside the call to foo(..)




> 
> ======= 2005-07-05 18:40:00 您在来信中写道：=======
> 
> >On Tue, 2005-07-05 at 23:18 +0800, alert7 wrote:
> >> hi,all
> >> 	  
> >> 	  
> >>       I don't know how to get the Nth argument stmt  from CALL_EXPR stmt tree?
> >
> >
> >assuming TREE_CODE (call) == CALL_EXPR:
> >
> >GetCallArgOperand(tree call, int i)
> >{
> >  int j = 0;
> >  tree arg;	
> >  for (arg = TREE_OPERAND (call, 1); arg; arg = TREE_CHAIN (arg), j++)
> >  {
> >     if (i == j)
> >       return TREE_VALUE (arg);
> >
> >  }
> >}
> >
> >> 
> >> 	  the GetCallArgOperands implement this function that i code ,but it isn't working :(
> >
> >You are looking at the arguments the declaration takes, instead of the
> >arguments passed to the function.
> >Arguments passed to the function are stored in TREE_OPERAND (call, 1),
> >as tree.def says.
> >
> >> 
> >> 	  thanks any advice or piece of example code .
> >> 
> >> //////////////////////////////////////////////////////
> >> 
> >>  tree GetCallArgOperands(tree stmt ,int i){
> >>  tree func, param, args;
> >>  int j = 1;
> >> 
> >>  
> >>   func = get_callee_fndecl (stmt);
> >>   
> >>   for (param = DECL_ARGUMENTS (func), args = TREE_OPERAND (stmt, 1);
> >> 	   param && args;
> >> 	   param = TREE_CHAIN (param), args = TREE_CHAIN (args))
> >>  {
> >> 	  tree arg = TREE_VALUE (args);
> >> 	  if (param != arg)
> >> 	    {
> >> 		// FIXME:
> >> 	    }
> >> 	  if (j==i) 
> >> 	  {
> >> 		  fprintf(stderr,"args ----------\n");
> >> 		  debug_tree(arg);
> >> 	  
> >> 		  return default_def (arg); //FIXME: to stmt tree ?
> >> 	  }
> >> 	  
> >> 	  j++;
> >>  }
> >> 	  return NULL_TREE;
> >> }
> >> /////////////////////////////////////////////////
> >> 
> >>   
> >> 
> >>  				
> >> 
> >> 　　　　　　　　bugs
> >> 　　　　　　　　bugs@whitecell.org
> >> 　　　　　　　　　　2005-07-05
> >> 
> >> 
> 
> = = = = = = = = = = = = = = = = = = = =
> 			
> 
> 　　　　　　　　致
> 礼！
>  
> 				 
> 　　　　　　　　alert7
> 　　　　　　　　bugs@whitecell.org
> 　　　　　　　　　　2005-07-06
> 
> 
>