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//== TraversalChecker.cpp -------------------------------------- -*- C++ -*--=//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// These checkers print various aspects of the ExprEngine's traversal of the CFG
// as it builds the ExplodedGraph.
//
//===----------------------------------------------------------------------===//
#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
#include "clang/AST/ParentMap.h"
#include "clang/AST/StmtObjC.h"
#include "clang/StaticAnalyzer/Core/Checker.h"
#include "clang/StaticAnalyzer/Core/CheckerManager.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang;
using namespace ento;
namespace {
class TraversalDumper : public Checker< check::BranchCondition,
check::BeginFunction,
check::EndFunction > {
public:
void checkBranchCondition(const Stmt *Condition, CheckerContext &C) const;
void checkBeginFunction(CheckerContext &C) const;
void checkEndFunction(const ReturnStmt *RS, CheckerContext &C) const;
};
}
void TraversalDumper::checkBranchCondition(const Stmt *Condition,
CheckerContext &C) const {
// Special-case Objective-C's for-in loop, which uses the entire loop as its
// condition. We just print the collection expression.
const Stmt *Parent = dyn_cast<ObjCForCollectionStmt>(Condition);
if (!Parent) {
const ParentMap &Parents = C.getLocationContext()->getParentMap();
Parent = Parents.getParent(Condition);
}
// It is mildly evil to print directly to llvm::outs() rather than emitting
// warnings, but this ensures things do not get filtered out by the rest of
// the static analyzer machinery.
SourceLocation Loc = Parent->getBeginLoc();
llvm::outs() << C.getSourceManager().getSpellingLineNumber(Loc) << " "
<< Parent->getStmtClassName() << "\n";
}
void TraversalDumper::checkBeginFunction(CheckerContext &C) const {
llvm::outs() << "--BEGIN FUNCTION--\n";
}
void TraversalDumper::checkEndFunction(const ReturnStmt *RS,
CheckerContext &C) const {
llvm::outs() << "--END FUNCTION--\n";
}
void ento::registerTraversalDumper(CheckerManager &mgr) {
mgr.registerChecker<TraversalDumper>();
}
bool ento::shouldRegisterTraversalDumper(const CheckerManager &mgr) {
return true;
}
//------------------------------------------------------------------------------
namespace {
class CallDumper : public Checker< check::PreCall,
check::PostCall > {
public:
void checkPreCall(const CallEvent &Call, CheckerContext &C) const;
void checkPostCall(const CallEvent &Call, CheckerContext &C) const;
};
}
void CallDumper::checkPreCall(const CallEvent &Call, CheckerContext &C) const {
unsigned Indentation = 0;
for (const LocationContext *LC = C.getLocationContext()->getParent();
LC != nullptr; LC = LC->getParent())
++Indentation;
// It is mildly evil to print directly to llvm::outs() rather than emitting
// warnings, but this ensures things do not get filtered out by the rest of
// the static analyzer machinery.
llvm::outs().indent(Indentation);
Call.dump(llvm::outs());
}
void CallDumper::checkPostCall(const CallEvent &Call, CheckerContext &C) const {
const Expr *CallE = Call.getOriginExpr();
if (!CallE)
return;
unsigned Indentation = 0;
for (const LocationContext *LC = C.getLocationContext()->getParent();
LC != nullptr; LC = LC->getParent())
++Indentation;
// It is mildly evil to print directly to llvm::outs() rather than emitting
// warnings, but this ensures things do not get filtered out by the rest of
// the static analyzer machinery.
llvm::outs().indent(Indentation);
if (Call.getResultType()->isVoidType())
llvm::outs() << "Returning void\n";
else
llvm::outs() << "Returning " << C.getSVal(CallE) << "\n";
}
void ento::registerCallDumper(CheckerManager &mgr) {
mgr.registerChecker<CallDumper>();
}
bool ento::shouldRegisterCallDumper(const CheckerManager &mgr) {
return true;
}
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