llvm/clang/lib/StaticAnalyzer/Checkers/BuiltinFunctionChecker.cpp

//=== BuiltinFunctionChecker.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
//
//===----------------------------------------------------------------------===//
//
// This checker evaluates "standalone" clang builtin functions that are not
// just special-cased variants of well-known non-builtin functions.
// Builtin functions like __builtin_memcpy and __builtin_alloca should be
// evaluated by the same checker that handles their non-builtin variant to
// ensure that the two variants are handled consistently.
//
//===----------------------------------------------------------------------===//

#include "clang/Basic/Builtins.h"
#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
#include "clang/StaticAnalyzer/Checkers/Taint.h"
#include "clang/StaticAnalyzer/Core/Checker.h"
#include "clang/StaticAnalyzer/Core/CheckerManager.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CallDescription.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerHelpers.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/DynamicExtent.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/SVals.h"

usingnamespaceclang;
usingnamespaceento;
usingnamespacetaint;

namespace {

QualType getSufficientTypeForOverflowOp(CheckerContext &C, const QualType &T) { … }

QualType getOverflowBuiltinResultType(const CallEvent &Call) { … }

QualType getOverflowBuiltinResultType(const CallEvent &Call, CheckerContext &C,
                                      unsigned BI) { … }

class BuiltinFunctionChecker : public Checker<eval::Call> { … };

} // namespace

const NoteTag *BuiltinFunctionChecker::createBuiltinNoOverflowNoteTag(
    CheckerContext &C, bool BothFeasible, SVal Arg1, SVal Arg2,
    SVal Result) const { … }

const NoteTag *
BuiltinFunctionChecker::createBuiltinOverflowNoteTag(CheckerContext &C) const { … }

std::pair<bool, bool>
BuiltinFunctionChecker::checkOverflow(CheckerContext &C, SVal RetVal,
                                      QualType Res) const { … }

void BuiltinFunctionChecker::handleOverflowBuiltin(const CallEvent &Call,
                                                   CheckerContext &C,
                                                   BinaryOperator::Opcode Op,
                                                   QualType ResultType) const { … }

bool BuiltinFunctionChecker::isBuiltinLikeFunction(
    const CallEvent &Call) const { … }

bool BuiltinFunctionChecker::evalCall(const CallEvent &Call,
                                      CheckerContext &C) const { … }

void ento::registerBuiltinFunctionChecker(CheckerManager &mgr) { … }

bool ento::shouldRegisterBuiltinFunctionChecker(const CheckerManager &mgr) { … }