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//==-- DebugContainerModeling.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/CallDescription.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 DebugContainerModeling
: public Checker<eval::Call> {
std::unique_ptr<BugType> DebugMsgBugType;
template <typename Getter>
void analyzerContainerDataField(const CallExpr *CE, CheckerContext &C,
Getter get) const;
void analyzerContainerBegin(const CallExpr *CE, CheckerContext &C) const;
void analyzerContainerEnd(const CallExpr *CE, CheckerContext &C) const;
ExplodedNode *reportDebugMsg(llvm::StringRef Msg, CheckerContext &C) const;
typedef void (DebugContainerModeling::*FnCheck)(const CallExpr *,
CheckerContext &) const;
CallDescriptionMap<FnCheck> Callbacks = {
{{"clang_analyzer_container_begin", 1},
&DebugContainerModeling::analyzerContainerBegin},
{{"clang_analyzer_container_end", 1},
&DebugContainerModeling::analyzerContainerEnd},
};
public:
DebugContainerModeling();
bool evalCall(const CallEvent &Call, CheckerContext &C) const;
};
} //namespace
DebugContainerModeling::DebugContainerModeling() {
DebugMsgBugType.reset(
new BugType(this, "Checking analyzer assumptions", "debug",
/*SuppressOnSink=*/true));
}
bool DebugContainerModeling::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 DebugContainerModeling::analyzerContainerDataField(const CallExpr *CE,
CheckerContext &C,
Getter get) const {
if (CE->getNumArgs() == 0) {
reportDebugMsg("Missing container argument", C);
return;
}
auto State = C.getState();
const MemRegion *Cont = C.getSVal(CE->getArg(0)).getAsRegion();
if (Cont) {
const auto *Data = getContainerData(State, Cont);
if (Data) {
SymbolRef Field = get(Data);
if (Field) {
State = State->BindExpr(CE, C.getLocationContext(),
nonloc::SymbolVal(Field));
// Progpagate interestingness from the container's data (marked
// interesting by an `ExprInspection` debug call to the container
// itself.
const NoteTag *InterestingTag =
C.getNoteTag(
[Cont, Field](PathSensitiveBugReport &BR) -> std::string {
if (BR.isInteresting(Field)) {
BR.markInteresting(Cont);
}
return "";
});
C.addTransition(State, InterestingTag);
return;
}
}
}
auto &BVF = C.getSValBuilder().getBasicValueFactory();
State = State->BindExpr(CE, C.getLocationContext(),
nonloc::ConcreteInt(BVF.getValue(llvm::APSInt::get(0))));
}
void DebugContainerModeling::analyzerContainerBegin(const CallExpr *CE,
CheckerContext &C) const {
analyzerContainerDataField(CE, C, [](const ContainerData *D) {
return D->getBegin();
});
}
void DebugContainerModeling::analyzerContainerEnd(const CallExpr *CE,
CheckerContext &C) const {
analyzerContainerDataField(CE, C, [](const ContainerData *D) {
return D->getEnd();
});
}
ExplodedNode *DebugContainerModeling::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::registerDebugContainerModeling(CheckerManager &mgr) {
mgr.registerChecker<DebugContainerModeling>();
}
bool ento::shouldRegisterDebugContainerModeling(const CheckerManager &mgr) {
return true;
}
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