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