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//== RangedConstraintManager.h ----------------------------------*- 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
//
//===----------------------------------------------------------------------===//
//
// Ranged constraint manager, built on SimpleConstraintManager.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LIB_STATICANALYZER_CORE_RANGEDCONSTRAINTMANAGER_H
#define LLVM_CLANG_LIB_STATICANALYZER_CORE_RANGEDCONSTRAINTMANAGER_H
#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramStateTrait.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/SimpleConstraintManager.h"
namespace clang {
namespace ento {
/// A Range represents the closed range [from, to]. The caller must
/// guarantee that from <= to. Note that Range is immutable, so as not
/// to subvert RangeSet's immutability.
class Range : public std::pair<const llvm::APSInt *, const llvm::APSInt *> {
public:
Range(const llvm::APSInt &from, const llvm::APSInt &to)
: std::pair<const llvm::APSInt *, const llvm::APSInt *>(&from, &to) {
assert(from <= to);
}
bool Includes(const llvm::APSInt &v) const {
return *first <= v && v <= *second;
}
const llvm::APSInt &From() const { return *first; }
const llvm::APSInt &To() const { return *second; }
const llvm::APSInt *getConcreteValue() const {
return &From() == &To() ? &From() : nullptr;
}
void Profile(llvm::FoldingSetNodeID &ID) const {
ID.AddPointer(&From());
ID.AddPointer(&To());
}
};
class RangeTrait : public llvm::ImutContainerInfo<Range> {
public:
// When comparing if one Range is less than another, we should compare
// the actual APSInt values instead of their pointers. This keeps the order
// consistent (instead of comparing by pointer values) and can potentially
// be used to speed up some of the operations in RangeSet.
static inline bool isLess(key_type_ref lhs, key_type_ref rhs) {
return *lhs.first < *rhs.first ||
(!(*rhs.first < *lhs.first) && *lhs.second < *rhs.second);
}
};
/// RangeSet contains a set of ranges. If the set is empty, then
/// there the value of a symbol is overly constrained and there are no
/// possible values for that symbol.
class RangeSet {
typedef llvm::ImmutableSet<Range, RangeTrait> PrimRangeSet;
PrimRangeSet ranges; // no need to make const, since it is an
// ImmutableSet - this allows default operator=
// to work.
public:
typedef PrimRangeSet::Factory Factory;
typedef PrimRangeSet::iterator iterator;
RangeSet(PrimRangeSet RS) : ranges(RS) {}
/// Create a new set with all ranges of this set and RS.
/// Possible intersections are not checked here.
RangeSet addRange(Factory &F, const RangeSet &RS) {
PrimRangeSet Ranges(RS.ranges);
for (const auto &range : ranges)
Ranges = F.add(Ranges, range);
return RangeSet(Ranges);
}
iterator begin() const { return ranges.begin(); }
iterator end() const { return ranges.end(); }
bool isEmpty() const { return ranges.isEmpty(); }
/// Construct a new RangeSet representing '{ [from, to] }'.
RangeSet(Factory &F, const llvm::APSInt &from, const llvm::APSInt &to)
: ranges(F.add(F.getEmptySet(), Range(from, to))) {}
/// Profile - Generates a hash profile of this RangeSet for use
/// by FoldingSet.
void Profile(llvm::FoldingSetNodeID &ID) const { ranges.Profile(ID); }
/// getConcreteValue - If a symbol is contrained to equal a specific integer
/// constant then this method returns that value. Otherwise, it returns
/// NULL.
const llvm::APSInt *getConcreteValue() const {
return ranges.isSingleton() ? ranges.begin()->getConcreteValue() : nullptr;
}
private:
void IntersectInRange(BasicValueFactory &BV, Factory &F,
const llvm::APSInt &Lower, const llvm::APSInt &Upper,
PrimRangeSet &newRanges, PrimRangeSet::iterator &i,
PrimRangeSet::iterator &e) const;
const llvm::APSInt &getMinValue() const;
bool pin(llvm::APSInt &Lower, llvm::APSInt &Upper) const;
public:
RangeSet Intersect(BasicValueFactory &BV, Factory &F, llvm::APSInt Lower,
llvm::APSInt Upper) const;
RangeSet Intersect(BasicValueFactory &BV, Factory &F,
const RangeSet &Other) const;
RangeSet Negate(BasicValueFactory &BV, Factory &F) const;
void print(raw_ostream &os) const;
bool operator==(const RangeSet &other) const {
return ranges == other.ranges;
}
};
class ConstraintRange {};
using ConstraintRangeTy = llvm::ImmutableMap<SymbolRef, RangeSet>;
template <>
struct ProgramStateTrait<ConstraintRange>
: public ProgramStatePartialTrait<ConstraintRangeTy> {
static void *GDMIndex();
};
class RangedConstraintManager : public SimpleConstraintManager {
public:
RangedConstraintManager(SubEngine *SE, SValBuilder &SB)
: SimpleConstraintManager(SE, SB) {}
~RangedConstraintManager() override;
//===------------------------------------------------------------------===//
// Implementation for interface from SimpleConstraintManager.
//===------------------------------------------------------------------===//
ProgramStateRef assumeSym(ProgramStateRef State, SymbolRef Sym,
bool Assumption) override;
ProgramStateRef assumeSymInclusiveRange(ProgramStateRef State, SymbolRef Sym,
const llvm::APSInt &From,
const llvm::APSInt &To,
bool InRange) override;
ProgramStateRef assumeSymUnsupported(ProgramStateRef State, SymbolRef Sym,
bool Assumption) override;
protected:
/// Assume a constraint between a symbolic expression and a concrete integer.
virtual ProgramStateRef assumeSymRel(ProgramStateRef State, SymbolRef Sym,
BinaryOperator::Opcode op,
const llvm::APSInt &Int);
//===------------------------------------------------------------------===//
// Interface that subclasses must implement.
//===------------------------------------------------------------------===//
// Each of these is of the form "$Sym+Adj <> V", where "<>" is the comparison
// operation for the method being invoked.
virtual ProgramStateRef assumeSymNE(ProgramStateRef State, SymbolRef Sym,
const llvm::APSInt &V,
const llvm::APSInt &Adjustment) = 0;
virtual ProgramStateRef assumeSymEQ(ProgramStateRef State, SymbolRef Sym,
const llvm::APSInt &V,
const llvm::APSInt &Adjustment) = 0;
virtual ProgramStateRef assumeSymLT(ProgramStateRef State, SymbolRef Sym,
const llvm::APSInt &V,
const llvm::APSInt &Adjustment) = 0;
virtual ProgramStateRef assumeSymGT(ProgramStateRef State, SymbolRef Sym,
const llvm::APSInt &V,
const llvm::APSInt &Adjustment) = 0;
virtual ProgramStateRef assumeSymLE(ProgramStateRef State, SymbolRef Sym,
const llvm::APSInt &V,
const llvm::APSInt &Adjustment) = 0;
virtual ProgramStateRef assumeSymGE(ProgramStateRef State, SymbolRef Sym,
const llvm::APSInt &V,
const llvm::APSInt &Adjustment) = 0;
virtual ProgramStateRef assumeSymWithinInclusiveRange(
ProgramStateRef State, SymbolRef Sym, const llvm::APSInt &From,
const llvm::APSInt &To, const llvm::APSInt &Adjustment) = 0;
virtual ProgramStateRef assumeSymOutsideInclusiveRange(
ProgramStateRef State, SymbolRef Sym, const llvm::APSInt &From,
const llvm::APSInt &To, const llvm::APSInt &Adjustment) = 0;
//===------------------------------------------------------------------===//
// Internal implementation.
//===------------------------------------------------------------------===//
private:
static void computeAdjustment(SymbolRef &Sym, llvm::APSInt &Adjustment);
};
} // end GR namespace
} // end clang namespace
#endif
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