[cfe-dev] How to get the Location of SystemFunction，I used the SourceLocation and miss some trouble

[flappybird]

hello,I try to Insert some code before a function when it was called.for
example:
char *p,*q;
  strcpy(p,q);
^                  ^
I want to insert some code at this two place,but I failed to handle it.
I used just like this:
 VisitCallExpr(CallExpr *CE){
if(FunctionDecl *FD=CE->getDirectCallee()) 
{
...
SourceRange sr = FD->getSourceRange();
SourceLocation ST1 = sr.getBegin();
...
}
}

but I found it make no difference when I used  Rewrite.InsertText(ST1,
tempfc, true, true);
trying to insert some code into it.
would you please tell me what's wrong with it and show me how to some this
problem
thank you



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