Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//==- BasicValueFactory.h - Basic values for Path Sens analysis --*- 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 file defines BasicValueFactory, a class that manages the lifetime

//  of APSInt objects and symbolic constraints used by ExprEngine

//  and related classes.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_STATICANALYZER_CORE_PATHSENSITIVE_BASICVALUEFACTORY_H

#define LLVM_CLANG_STATICANALYZER_CORE_PATHSENSITIVE_BASICVALUEFACTORY_H

#include "clang/AST/ASTContext.h"

#include "clang/AST/Expr.h"

#include "clang/AST/Type.h"

#include "clang/StaticAnalyzer/Core/PathSensitive/APSIntType.h"

#include "clang/StaticAnalyzer/Core/PathSensitive/SVals.h"

#include "clang/StaticAnalyzer/Core/PathSensitive/StoreRef.h"

#include "clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h"

#include "llvm/ADT/APSInt.h"

#include "llvm/ADT/FoldingSet.h"

#include "llvm/ADT/ImmutableList.h"

#include "llvm/ADT/iterator_range.h"

#include "llvm/Support/Allocator.h"

#include <cassert>

#include <cstdint>

#include <utility>

namespace clang {

class CXXBaseSpecifier;

namespace ento {

class CompoundValData : public llvm::FoldingSetNode {

  QualType T;

  llvm::ImmutableList<SVal> L;

public:

  CompoundValData(QualType t, llvm::ImmutableList<SVal> l) : T(t), L(l) {

    assert(NonLoc::isCompoundType(t));

  }

  using iterator = llvm::ImmutableList<SVal>::iterator;

  iterator begin() const { return L.begin(); }

  iterator end() const { return L.end(); }

  QualType getType() const { return T; }

  static void Profile(llvm::FoldingSetNodeID& ID, QualType T,

                      llvm::ImmutableList<SVal> L);

  void Profile(llvm::FoldingSetNodeID& ID) { Profile(ID, T, L); }

};

class LazyCompoundValData : public llvm::FoldingSetNode {

  StoreRef store;

  const TypedValueRegion *region;

public:

  LazyCompoundValData(const StoreRef &st, const TypedValueRegion *r)

      : store(st), region(r) {

    assert(r);

    assert(NonLoc::isCompoundType(r->getValueType()));

  }

  /// It might return null.

  const void *getStore() const { return store.getStore(); }

  LLVM_ATTRIBUTE_RETURNS_NONNULL

  const TypedValueRegion *getRegion() const { return region; }

  static void Profile(llvm::FoldingSetNodeID& ID,

                      const StoreRef &store,

                      const TypedValueRegion *region);

  void Profile(llvm::FoldingSetNodeID& ID) { Profile(ID, store, region); }

};

class PointerToMemberData : public llvm::FoldingSetNode {

  const NamedDecl *D;

  llvm::ImmutableList<const CXXBaseSpecifier *> L;

public:

  PointerToMemberData(const NamedDecl *D,

                      llvm::ImmutableList<const CXXBaseSpecifier *> L)

      : D(D), L(L) {}

  using iterator = llvm::ImmutableList<const CXXBaseSpecifier *>::iterator;

  iterator begin() const { return L.begin(); }

  iterator end() const { return L.end(); }

  static void Profile(llvm::FoldingSetNodeID &ID, const NamedDecl *D,

                      llvm::ImmutableList<const CXXBaseSpecifier *> L);

  void Profile(llvm::FoldingSetNodeID &ID) { Profile(ID, D, L); }

  /// It might return null.

  const NamedDecl *getDeclaratorDecl() const { return D; }

  llvm::ImmutableList<const CXXBaseSpecifier *> getCXXBaseList() const {

    return L;

  }

};

class BasicValueFactory {

  using APSIntSetTy =

      llvm::FoldingSet<llvm::FoldingSetNodeWrapper<llvm::APSInt>>;

  ASTContext &Ctx;

  llvm::BumpPtrAllocator& BPAlloc;

  APSIntSetTy APSIntSet;

  void *PersistentSVals = nullptr;

  void *PersistentSValPairs = nullptr;

  llvm::ImmutableList<SVal>::Factory SValListFactory;

  llvm::ImmutableList<const CXXBaseSpecifier *>::Factory CXXBaseListFactory;

  llvm::FoldingSet<CompoundValData>  CompoundValDataSet;

  llvm::FoldingSet<LazyCompoundValData> LazyCompoundValDataSet;

  llvm::FoldingSet<PointerToMemberData> PointerToMemberDataSet;

  // This is private because external clients should use the factory

  // method that takes a QualType.

  const llvm::APSInt& getValue(uint64_t X, unsigned BitWidth, bool isUnsigned);

public:

  BasicValueFactory(ASTContext &ctx, llvm::BumpPtrAllocator &Alloc)

      : Ctx(ctx), BPAlloc(Alloc), SValListFactory(Alloc),

        CXXBaseListFactory(Alloc) {}

  ~BasicValueFactory();

  ASTContext &getContext() const { return Ctx; }

  const llvm::APSInt& getValue(const llvm::APSInt& X);

  const llvm::APSInt& getValue(const llvm::APInt& X, bool isUnsigned);

  const llvm::APSInt& getValue(uint64_t X, QualType T);

  /// Returns the type of the APSInt used to store values of the given QualType.

  APSIntType getAPSIntType(QualType T) const {

    // For the purposes of the analysis and constraints, we treat atomics

    // as their underlying types.

    if (const AtomicType *AT = T->getAs<AtomicType>()) {

      T = AT->getValueType();

    }

    if (T->isIntegralOrEnumerationType() || Loc::isLocType(T)) {

      return APSIntType(Ctx.getIntWidth(T),

                        !T->isSignedIntegerOrEnumerationType());

    } else {

      // implicitly handle case of T->isFixedPointType()

      return APSIntType(Ctx.getIntWidth(T), T->isUnsignedFixedPointType());

    }

    llvm_unreachable("Unsupported type in getAPSIntType!");

  }

  /// Convert - Create a new persistent APSInt with the same value as 'From'

  ///  but with the bitwidth and signedness of 'To'.

  const llvm::APSInt &Convert(const llvm::APSInt& To,

                              const llvm::APSInt& From) {

    APSIntType TargetType(To);

    if (TargetType == APSIntType(From))

      return From;

    return getValue(TargetType.convert(From));

  }

  const llvm::APSInt &Convert(QualType T, const llvm::APSInt &From) {

    APSIntType TargetType = getAPSIntType(T);

    return Convert(TargetType, From);

  }

  const llvm::APSInt &Convert(APSIntType TargetType, const llvm::APSInt &From) {

    if (TargetType == APSIntType(From))

      return From;

    return getValue(TargetType.convert(From));

  }

  const llvm::APSInt &getIntValue(uint64_t X, bool isUnsigned) {

    QualType T = isUnsigned ? Ctx.UnsignedIntTy : Ctx.IntTy;

    return getValue(X, T);

  }

  const llvm::APSInt &getMaxValue(const llvm::APSInt &v) {

    return getValue(APSIntType(v).getMaxValue());

  }

  const llvm::APSInt &getMinValue(const llvm::APSInt &v) {

    return getValue(APSIntType(v).getMinValue());

  }

  const llvm::APSInt &getMaxValue(QualType T) {

    return getMaxValue(getAPSIntType(T));

  }

  const llvm::APSInt &getMinValue(QualType T) {

    return getMinValue(getAPSIntType(T));

  }

  const llvm::APSInt &getMaxValue(APSIntType T) {

    return getValue(T.getMaxValue());

  }

  const llvm::APSInt &getMinValue(APSIntType T) {

    return getValue(T.getMinValue());

  }

  const llvm::APSInt &Add1(const llvm::APSInt &V) {

    llvm::APSInt X = V;

    ++X;

    return getValue(X);

  }

  const llvm::APSInt &Sub1(const llvm::APSInt &V) {

    llvm::APSInt X = V;

    --X;

    return getValue(X);

  }

  const llvm::APSInt &getZeroWithTypeSize(QualType T) {

    assert(T->isScalarType());

    return getValue(0, Ctx.getTypeSize(T), true);

  }

  const llvm::APSInt &getTruthValue(bool b, QualType T) {

    return getValue(b ? 1 : 0, Ctx.getIntWidth(T),

                    T->isUnsignedIntegerOrEnumerationType());

  }

  const llvm::APSInt &getTruthValue(bool b) {

    return getTruthValue(b, Ctx.getLogicalOperationType());

  }

  const CompoundValData *getCompoundValData(QualType T,

                                            llvm::ImmutableList<SVal> Vals);

  const LazyCompoundValData *getLazyCompoundValData(const StoreRef &store,

                                            const TypedValueRegion *region);

  const PointerToMemberData *

  getPointerToMemberData(const NamedDecl *ND,

                         llvm::ImmutableList<const CXXBaseSpecifier *> L);

  llvm::ImmutableList<SVal> getEmptySValList() {

    return SValListFactory.getEmptyList();

  }

  llvm::ImmutableList<SVal> prependSVal(SVal X, llvm::ImmutableList<SVal> L) {

    return SValListFactory.add(X, L);

  }

  llvm::ImmutableList<const CXXBaseSpecifier *> getEmptyCXXBaseList() {

    return CXXBaseListFactory.getEmptyList();

  }

  llvm::ImmutableList<const CXXBaseSpecifier *> prependCXXBase(

      const CXXBaseSpecifier *CBS,

      llvm::ImmutableList<const CXXBaseSpecifier *> L) {

    return CXXBaseListFactory.add(CBS, L);

  }

  const PointerToMemberData *

  accumCXXBase(llvm::iterator_range<CastExpr::path_const_iterator> PathRange,

               const nonloc::PointerToMember &PTM, const clang::CastKind &kind);

  const llvm::APSInt* evalAPSInt(BinaryOperator::Opcode Op,

                                     const llvm::APSInt& V1,

                                     const llvm::APSInt& V2);

  const std::pair<SVal, uintptr_t>&

  getPersistentSValWithData(const SVal& V, uintptr_t Data);

  const std::pair<SVal, SVal>&

  getPersistentSValPair(const SVal& V1, const SVal& V2);

  const SVal* getPersistentSVal(SVal X);

};

} // namespace ento

} // namespace clang

#endif // LLVM_CLANG_STATICANALYZER_CORE_PATHSENSITIVE_BASICVALUEFACTORY_H