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//=== Iterator.h - Common functions for iterator checkers. ---------*- 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 common functions to be used by the itertor checkers .
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LIB_STATICANALYZER_CHECKERS_ITERATOR_H
#define LLVM_CLANG_LIB_STATICANALYZER_CHECKERS_ITERATOR_H
#include "clang/StaticAnalyzer/Core/PathSensitive/DynamicType.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/SymExpr.h"
namespace clang {
namespace ento {
namespace iterator {
// Abstract position of an iterator. This helps to handle all three kinds
// of operators in a common way by using a symbolic position.
struct IteratorPosition {
private:
// Container the iterator belongs to
const MemRegion *Cont;
// Whether iterator is valid
const bool Valid;
// Abstract offset
const SymbolRef Offset;
IteratorPosition(const MemRegion *C, bool V, SymbolRef Of)
: Cont(C), Valid(V), Offset(Of) {}
public:
const MemRegion *getContainer() const { return Cont; }
bool isValid() const { return Valid; }
SymbolRef getOffset() const { return Offset; }
IteratorPosition invalidate() const {
return IteratorPosition(Cont, false, Offset);
}
static IteratorPosition getPosition(const MemRegion *C, SymbolRef Of) {
return IteratorPosition(C, true, Of);
}
IteratorPosition setTo(SymbolRef NewOf) const {
return IteratorPosition(Cont, Valid, NewOf);
}
IteratorPosition reAssign(const MemRegion *NewCont) const {
return IteratorPosition(NewCont, Valid, Offset);
}
bool operator==(const IteratorPosition &X) const {
return Cont == X.Cont && Valid == X.Valid && Offset == X.Offset;
}
bool operator!=(const IteratorPosition &X) const {
return Cont != X.Cont || Valid != X.Valid || Offset != X.Offset;
}
void Profile(llvm::FoldingSetNodeID &ID) const {
ID.AddPointer(Cont);
ID.AddInteger(Valid);
ID.Add(Offset);
}
};
// Structure to record the symbolic begin and end position of a container
struct ContainerData {
private:
const SymbolRef Begin, End;
ContainerData(SymbolRef B, SymbolRef E) : Begin(B), End(E) {}
public:
static ContainerData fromBegin(SymbolRef B) {
return ContainerData(B, nullptr);
}
static ContainerData fromEnd(SymbolRef E) {
return ContainerData(nullptr, E);
}
SymbolRef getBegin() const { return Begin; }
SymbolRef getEnd() const { return End; }
ContainerData newBegin(SymbolRef B) const { return ContainerData(B, End); }
ContainerData newEnd(SymbolRef E) const { return ContainerData(Begin, E); }
bool operator==(const ContainerData &X) const {
return Begin == X.Begin && End == X.End;
}
bool operator!=(const ContainerData &X) const {
return Begin != X.Begin || End != X.End;
}
void Profile(llvm::FoldingSetNodeID &ID) const {
ID.Add(Begin);
ID.Add(End);
}
};
class IteratorSymbolMap {};
class IteratorRegionMap {};
class ContainerMap {};
using IteratorSymbolMapTy =
CLANG_ENTO_PROGRAMSTATE_MAP(SymbolRef, IteratorPosition);
using IteratorRegionMapTy =
CLANG_ENTO_PROGRAMSTATE_MAP(const MemRegion *, IteratorPosition);
using ContainerMapTy =
CLANG_ENTO_PROGRAMSTATE_MAP(const MemRegion *, ContainerData);
} // namespace iterator
template<>
struct ProgramStateTrait<iterator::IteratorSymbolMap>
: public ProgramStatePartialTrait<iterator::IteratorSymbolMapTy> {
static void *GDMIndex() { static int Index; return &Index; }
};
template<>
struct ProgramStateTrait<iterator::IteratorRegionMap>
: public ProgramStatePartialTrait<iterator::IteratorRegionMapTy> {
static void *GDMIndex() { static int Index; return &Index; }
};
template<>
struct ProgramStateTrait<iterator::ContainerMap>
: public ProgramStatePartialTrait<iterator::ContainerMapTy> {
static void *GDMIndex() { static int Index; return &Index; }
};
namespace iterator {
bool isIteratorType(const QualType &Type);
bool isIterator(const CXXRecordDecl *CRD);
bool isComparisonOperator(OverloadedOperatorKind OK);
bool isInsertCall(const FunctionDecl *Func);
bool isEraseCall(const FunctionDecl *Func);
bool isEraseAfterCall(const FunctionDecl *Func);
bool isEmplaceCall(const FunctionDecl *Func);
bool isAccessOperator(OverloadedOperatorKind OK);
bool isAccessOperator(UnaryOperatorKind OK);
bool isAccessOperator(BinaryOperatorKind OK);
bool isDereferenceOperator(OverloadedOperatorKind OK);
bool isDereferenceOperator(UnaryOperatorKind OK);
bool isDereferenceOperator(BinaryOperatorKind OK);
bool isIncrementOperator(OverloadedOperatorKind OK);
bool isIncrementOperator(UnaryOperatorKind OK);
bool isDecrementOperator(OverloadedOperatorKind OK);
bool isDecrementOperator(UnaryOperatorKind OK);
bool isRandomIncrOrDecrOperator(OverloadedOperatorKind OK);
bool isRandomIncrOrDecrOperator(BinaryOperatorKind OK);
const ContainerData *getContainerData(ProgramStateRef State,
const MemRegion *Cont);
const IteratorPosition *getIteratorPosition(ProgramStateRef State,
const SVal &Val);
ProgramStateRef setIteratorPosition(ProgramStateRef State, const SVal &Val,
const IteratorPosition &Pos);
ProgramStateRef createIteratorPosition(ProgramStateRef State, const SVal &Val,
const MemRegion *Cont, const Stmt* S,
const LocationContext *LCtx,
unsigned blockCount);
ProgramStateRef advancePosition(ProgramStateRef State,
const SVal &Iter,
OverloadedOperatorKind Op,
const SVal &Distance);
ProgramStateRef assumeNoOverflow(ProgramStateRef State, SymbolRef Sym,
long Scale);
bool compare(ProgramStateRef State, SymbolRef Sym1, SymbolRef Sym2,
BinaryOperator::Opcode Opc);
bool compare(ProgramStateRef State, NonLoc NL1, NonLoc NL2,
BinaryOperator::Opcode Opc);
} // namespace iterator
} // namespace ento
} // namespace clang
#endif
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