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//===--- CFGStmtVisitor.h - Visitor for Stmts in a CFG ----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the CFGStmtVisitor interface, which extends
// StmtVisitor. This interface is useful for visiting statements in a CFG
// where some statements have implicit control-flow and thus should
// be treated specially.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_ANALYSIS_CFGSTMTVISITOR_H
#define LLVM_CLANG_ANALYSIS_CFGSTMTVISITOR_H
#include "clang/AST/StmtVisitor.h"
#include "clang/AST/CFG.h"
namespace clang {
#define DISPATCH_CASE(CLASS) \
case Stmt::CLASS ## Class: return \
static_cast<ImplClass*>(this)->BlockStmt_Visit ## CLASS(static_cast<CLASS*>(S));
#define DEFAULT_BLOCKSTMT_VISIT(CLASS) RetTy BlockStmt_Visit ## CLASS(CLASS *S)\
{ return\
static_cast<ImplClass*>(this)->BlockStmt_VisitImplicitControlFlowExpr(\
cast<Expr>(S)); }
template <typename ImplClass, typename RetTy=void>
class CFGStmtVisitor : public StmtVisitor<ImplClass,RetTy> {
Stmt* CurrentBlkStmt;
struct NullifyStmt {
Stmt*& S;
NullifyStmt(Stmt*& s) : S(s) {}
~NullifyStmt() { S = NULL; }
};
public:
CFGStmtVisitor() : CurrentBlkStmt(NULL) {}
Stmt* getCurrentBlkStmt() const { return CurrentBlkStmt; }
RetTy Visit(Stmt* S) {
if (S == CurrentBlkStmt ||
!static_cast<ImplClass*>(this)->getCFG().isBlkExpr(S))
return StmtVisitor<ImplClass,RetTy>::Visit(S);
else
return RetTy();
}
/// BlockVisit_XXX - Visitor methods for visiting the "root" statements in
/// CFGBlocks. Root statements are the statements that appear explicitly in
/// the list of statements in a CFGBlock. For substatements, or when there
/// is no implementation provided for a BlockStmt_XXX method, we default
/// to using StmtVisitor's Visit method.
RetTy BlockStmt_Visit(Stmt* S) {
CurrentBlkStmt = S;
NullifyStmt cleanup(CurrentBlkStmt);
switch (S->getStmtClass()) {
DISPATCH_CASE(StmtExpr)
DISPATCH_CASE(ConditionalOperator)
DISPATCH_CASE(ObjCForCollectionStmt)
case Stmt::BinaryOperatorClass: {
BinaryOperator* B = cast<BinaryOperator>(S);
if (B->isLogicalOp())
return static_cast<ImplClass*>(this)->BlockStmt_VisitLogicalOp(B);
else if (B->getOpcode() == BinaryOperator::Comma)
return static_cast<ImplClass*>(this)->BlockStmt_VisitComma(B);
// Fall through.
}
default:
if (isa<Expr>(S))
return
static_cast<ImplClass*>(this)->BlockStmt_VisitExpr(cast<Expr>(S));
else
return static_cast<ImplClass*>(this)->BlockStmt_VisitStmt(S);
}
}
DEFAULT_BLOCKSTMT_VISIT(StmtExpr)
DEFAULT_BLOCKSTMT_VISIT(ConditionalOperator)
RetTy BlockStmt_VisitObjCForCollectionStmt(ObjCForCollectionStmt* S) {
return static_cast<ImplClass*>(this)->BlockStmt_VisitStmt(S);
}
RetTy BlockStmt_VisitImplicitControlFlowExpr(Expr* E) {
return static_cast<ImplClass*>(this)->BlockStmt_VisitExpr(E);
}
RetTy BlockStmt_VisitExpr(Expr* E) {
return static_cast<ImplClass*>(this)->BlockStmt_VisitStmt(E);
}
RetTy BlockStmt_VisitStmt(Stmt* S) {
return static_cast<ImplClass*>(this)->Visit(S);
}
RetTy BlockStmt_VisitLogicalOp(BinaryOperator* B) {
return
static_cast<ImplClass*>(this)->BlockStmt_VisitImplicitControlFlowExpr(B);
}
RetTy BlockStmt_VisitComma(BinaryOperator* B) {
return
static_cast<ImplClass*>(this)->BlockStmt_VisitImplicitControlFlowExpr(B);
}
//===--------------------------------------------------------------------===//
// Utility methods. Not called by default (but subclasses may use them).
//===--------------------------------------------------------------------===//
/// VisitChildren: Call "Visit" on each child of S.
void VisitChildren(Stmt* S) {
switch (S->getStmtClass()) {
default:
break;
case Stmt::StmtExprClass: {
CompoundStmt* CS = cast<StmtExpr>(S)->getSubStmt();
if (CS->body_empty()) return;
static_cast<ImplClass*>(this)->Visit(CS->body_back());
return;
}
case Stmt::BinaryOperatorClass: {
BinaryOperator* B = cast<BinaryOperator>(S);
if (B->getOpcode() != BinaryOperator::Comma) break;
static_cast<ImplClass*>(this)->Visit(B->getRHS());
return;
}
}
for (Stmt::child_iterator I=S->child_begin(), E=S->child_end(); I != E;++I)
if (*I) static_cast<ImplClass*>(this)->Visit(*I);
}
};
#undef DEFAULT_BLOCKSTMT_VISIT
#undef DISPATCH_CASE
} // end namespace clang
#endif
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