[cfe-dev] llvm::FoldingSetNodeID to compare Stmt

Pedro Delgado Perez pedro.delgadoperez at mail.uca.es
Sat Jan 18 04:20:30 PST 2014


Up to now, to determine if two objects "Stmt" were the same, I have been using the function "areSameExpr", which appers at the end of this link:

http://clang.llvm.org/docs/LibASTMatchersTutorial.html [ http://clang.llvm.org/docs/LibASTMatchersTutorial.html ]
static bool areSameExpr(ASTContext *Context, const Expr *First,                        const Expr *Second) {  if (!First || !Second)    return false;  llvm::FoldingSetNodeID FirstID, SecondID;  First->Profile(FirstID, *Context, true);  Second->Profile(SecondID, *Context, true);  return FirstID == SecondID;}
However, I have a problem with that function. To illustrate the issue, I retrieve a concrete Stmt (in bold in the example below) in a CompoundStmt through a matcher:

int l = 1; 

Then, when handling that Stmt, I search for the position of that stmt within the compoundStmt with a simple loop and using the function "areSameExpr" aforementioned.

for(CompoundStmt::body_iterator st = CompStmt->body_begin(); st != CompStmt->body_end(); st++){ 
               if(areSameStmt(Context, *st, StmtBound)){

However, this function considers that the first stmt in the compoundStmt is the same as the third one, and that is a problem in my case because I need to determine every stmt as unique to know the position. 
I have been studying the class llvm::FoldingSetNodeID
http://llvm.org/docs/doxygen/html/classllvm_1_1FoldingSetNodeID.html#a66f5b8a0b6a74b310d856ca736c1eb8c [ http://llvm.org/docs/doxygen/html/classllvm_1_1FoldingSetNodeID.html#a66f5b8a0b6a74b310d856ca736c1eb8c ]

I tried to use the method "ComputeHash" to compare both stmt, but it didn't suppose any change.

Please, does anyone know how I could fix this?


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