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//=-- AggExprVisitor.cpp - evaluating expressions of C++ class type -*- 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 AggExprVisitor class, which contains lots of boiler
// plate code for evaluating expressions of C++ class type.
//
//===----------------------------------------------------------------------===//
#include "clang/Checker/PathSensitive/GRExprEngine.h"
#include "clang/AST/StmtVisitor.h"
using namespace clang;
namespace {
/// AggExprVisitor is designed after AggExprEmitter of the CodeGen module. It
/// is used for evaluating exprs of C++ object type. Evaluating such exprs
/// requires a destination pointer pointing to the object being evaluated
/// into. Passing such a pointer around would pollute the Visit* interface of
/// GRExprEngine. AggExprVisitor encapsulates code that goes through various
/// cast and construct exprs (and others), and at the final point, dispatches
/// back to the GRExprEngine to let the real evaluation logic happen.
class AggExprVisitor : public StmtVisitor<AggExprVisitor> {
SVal DestPtr;
ExplodedNode *Pred;
ExplodedNodeSet &DstSet;
GRExprEngine &Eng;
public:
AggExprVisitor(SVal dest, ExplodedNode *N, ExplodedNodeSet &dst,
GRExprEngine &eng)
: DestPtr(dest), Pred(N), DstSet(dst), Eng(eng) {}
void VisitCastExpr(CastExpr *E);
void VisitCXXConstructExpr(CXXConstructExpr *E);
};
}
void AggExprVisitor::VisitCastExpr(CastExpr *E) {
switch (E->getCastKind()) {
default:
assert(0 && "Unhandled cast kind");
case CK_NoOp:
case CK_ConstructorConversion:
Visit(E->getSubExpr());
break;
}
}
void AggExprVisitor::VisitCXXConstructExpr(CXXConstructExpr *E) {
Eng.VisitCXXConstructExpr(E, DestPtr, Pred, DstSet);
}
void GRExprEngine::VisitAggExpr(const Expr *E, SVal Dest, ExplodedNode *Pred,
ExplodedNodeSet &Dst) {
AggExprVisitor(Dest, Pred, Dst, *this).Visit(const_cast<Expr *>(E));
}
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