DebugIteratorModeling.cpp
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//===-- DebugIteratorModeling.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
//
//===----------------------------------------------------------------------===//
//
// Defines a checker for debugging iterator modeling.
//
//===----------------------------------------------------------------------===//
#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
#include "clang/StaticAnalyzer/Core/Checker.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
#include "Iterator.h"
using namespace clang;
using namespace ento;
using namespace iterator;
namespace {
class DebugIteratorModeling
: public Checker<eval::Call> {
std::unique_ptr<BugType> DebugMsgBugType;
template <typename Getter>
void analyzerIteratorDataField(const CallExpr *CE, CheckerContext &C,
Getter get, SVal Default) const;
void analyzerIteratorPosition(const CallExpr *CE, CheckerContext &C) const;
void analyzerIteratorContainer(const CallExpr *CE, CheckerContext &C) const;
void analyzerIteratorValidity(const CallExpr *CE, CheckerContext &C) const;
ExplodedNode *reportDebugMsg(llvm::StringRef Msg, CheckerContext &C) const;
typedef void (DebugIteratorModeling::*FnCheck)(const CallExpr *,
CheckerContext &) const;
CallDescriptionMap<FnCheck> Callbacks = {
{{0, "clang_analyzer_iterator_position", 1},
&DebugIteratorModeling::analyzerIteratorPosition},
{{0, "clang_analyzer_iterator_container", 1},
&DebugIteratorModeling::analyzerIteratorContainer},
{{0, "clang_analyzer_iterator_validity", 1},
&DebugIteratorModeling::analyzerIteratorValidity},
};
public:
DebugIteratorModeling();
bool evalCall(const CallEvent &Call, CheckerContext &C) const;
};
} //namespace
DebugIteratorModeling::DebugIteratorModeling() {
DebugMsgBugType.reset(
new BugType(this, "Checking analyzer assumptions", "debug",
/*SuppressOnSink=*/true));
}
bool DebugIteratorModeling::evalCall(const CallEvent &Call,
CheckerContext &C) const {
const auto *CE = dyn_cast_or_null<CallExpr>(Call.getOriginExpr());
if (!CE)
return false;
const FnCheck *Handler = Callbacks.lookup(Call);
if (!Handler)
return false;
(this->**Handler)(CE, C);
return true;
}
template <typename Getter>
void DebugIteratorModeling::analyzerIteratorDataField(const CallExpr *CE,
CheckerContext &C,
Getter get,
SVal Default) const {
if (CE->getNumArgs() == 0) {
reportDebugMsg("Missing iterator argument", C);
return;
}
auto State = C.getState();
SVal V = C.getSVal(CE->getArg(0));
const auto *Pos = getIteratorPosition(State, V);
if (Pos) {
State = State->BindExpr(CE, C.getLocationContext(), get(Pos));
} else {
State = State->BindExpr(CE, C.getLocationContext(), Default);
}
C.addTransition(State);
}
void DebugIteratorModeling::analyzerIteratorPosition(const CallExpr *CE,
CheckerContext &C) const {
auto &BVF = C.getSValBuilder().getBasicValueFactory();
analyzerIteratorDataField(CE, C, [](const IteratorPosition *P) {
return nonloc::SymbolVal(P->getOffset());
}, nonloc::ConcreteInt(BVF.getValue(llvm::APSInt::get(0))));
}
void DebugIteratorModeling::analyzerIteratorContainer(const CallExpr *CE,
CheckerContext &C) const {
auto &BVF = C.getSValBuilder().getBasicValueFactory();
analyzerIteratorDataField(CE, C, [](const IteratorPosition *P) {
return loc::MemRegionVal(P->getContainer());
}, loc::ConcreteInt(BVF.getValue(llvm::APSInt::get(0))));
}
void DebugIteratorModeling::analyzerIteratorValidity(const CallExpr *CE,
CheckerContext &C) const {
auto &BVF = C.getSValBuilder().getBasicValueFactory();
analyzerIteratorDataField(CE, C, [&BVF](const IteratorPosition *P) {
return
nonloc::ConcreteInt(BVF.getValue(llvm::APSInt::get((P->isValid()))));
}, nonloc::ConcreteInt(BVF.getValue(llvm::APSInt::get(0))));
}
ExplodedNode *DebugIteratorModeling::reportDebugMsg(llvm::StringRef Msg,
CheckerContext &C) const {
ExplodedNode *N = C.generateNonFatalErrorNode();
if (!N)
return nullptr;
auto &BR = C.getBugReporter();
BR.emitReport(std::make_unique<PathSensitiveBugReport>(*DebugMsgBugType,
Msg, N));
return N;
}
void ento::registerDebugIteratorModeling(CheckerManager &mgr) {
mgr.registerChecker<DebugIteratorModeling>();
}
bool ento::shouldRegisterDebugIteratorModeling(const CheckerManager &mgr) {
return true;
}