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//== Checker.h - Abstract interface for checkers -----------------*- 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 Checker and CheckerVisitor, classes used for creating
// domain-specific checks.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_ANALYSIS_CHECKER
#define LLVM_CLANG_ANALYSIS_CHECKER
#include "clang/Analysis/Support/SaveAndRestore.h"
#include "clang/Analysis/PathSensitive/GRCoreEngine.h"
#include "clang/Analysis/PathSensitive/GRState.h"
#include "clang/Analysis/PathSensitive/GRExprEngine.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/ExprObjC.h"
#include "clang/AST/StmtCXX.h"
#include "clang/AST/StmtObjC.h"
//===----------------------------------------------------------------------===//
// Checker interface.
//===----------------------------------------------------------------------===//
namespace clang {
class GRExprEngine;
class CheckerContext {
ExplodedNodeSet &Dst;
GRStmtNodeBuilder &B;
GRExprEngine &Eng;
ExplodedNode *Pred;
SaveAndRestore<bool> OldSink;
SaveAndRestore<const void*> OldTag;
SaveAndRestore<ProgramPoint::Kind> OldPointKind;
SaveOr OldHasGen;
public:
CheckerContext(ExplodedNodeSet &dst,
GRStmtNodeBuilder &builder,
GRExprEngine &eng,
ExplodedNode *pred,
const void *tag, bool preVisit)
: Dst(dst), B(builder), Eng(eng), Pred(pred),
OldSink(B.BuildSinks), OldTag(B.Tag),
OldPointKind(B.PointKind), OldHasGen(B.HasGeneratedNode) {
//assert(Dst.empty()); // This is a fake assertion.
// See GRExprEngine::CheckerVisit(), CurrSet is repeatedly used.
B.Tag = tag;
if (preVisit)
B.PointKind = ProgramPoint::PreStmtKind;
}
~CheckerContext() {
if (!B.BuildSinks && !B.HasGeneratedNode)
Dst.Add(Pred);
}
ConstraintManager &getConstraintManager() {
return Eng.getConstraintManager();
}
ExplodedNodeSet &getNodeSet() { return Dst; }
GRStmtNodeBuilder &getNodeBuilder() { return B; }
ExplodedNode *&getPredecessor() { return Pred; }
const GRState *getState() { return B.GetState(Pred); }
ASTContext &getASTContext() {
return Eng.getContext();
}
ExplodedNode *GenerateNode(const Stmt *S, bool markAsSink = false) {
return GenerateNode(S, getState(), markAsSink);
}
ExplodedNode *GenerateNode(const Stmt* S, const GRState *state,
bool markAsSink = false) {
ExplodedNode *node = B.generateNode(S, state, Pred);
if (markAsSink && node)
node->markAsSink();
return node;
}
void addTransition(ExplodedNode *node) {
Dst.Add(node);
}
void EmitReport(BugReport *R) {
Eng.getBugReporter().EmitReport(R);
}
};
class Checker {
private:
friend class GRExprEngine;
void GR_Visit(ExplodedNodeSet &Dst,
GRStmtNodeBuilder &Builder,
GRExprEngine &Eng,
const Stmt *stmt,
ExplodedNode *Pred, bool isPrevisit) {
CheckerContext C(Dst, Builder, Eng, Pred, getTag(), isPrevisit);
assert(isPrevisit && "Only previsit supported for now.");
_PreVisit(C, stmt);
}
public:
virtual ~Checker() {}
virtual void _PreVisit(CheckerContext &C, const Stmt *stmt) = 0;
virtual const void *getTag() = 0;
};
} // end clang namespace
#endif
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