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//===- SymExpr.h - Management of Symbolic Values ----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines SymExpr and SymbolData.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_STATICANALYZER_CORE_PATHSENSITIVE_SYMEXPR_H
#define LLVM_CLANG_STATICANALYZER_CORE_PATHSENSITIVE_SYMEXPR_H
#include "clang/AST/Type.h"
#include "clang/Basic/LLVM.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/SmallVector.h"
#include <cassert>
namespace clang {
namespace ento {
class MemRegion;
/// Symbolic value. These values used to capture symbolic execution of
/// the program.
class SymExpr : public llvm::FoldingSetNode {
virtual void anchor();
public:
enum Kind {
#define SYMBOL(Id, Parent) Id##Kind,
#define SYMBOL_RANGE(Id, First, Last) BEGIN_##Id = First, END_##Id = Last,
#include "clang/StaticAnalyzer/Core/PathSensitive/Symbols.def"
};
private:
Kind K;
protected:
SymExpr(Kind k) : K(k) {}
static bool isValidTypeForSymbol(QualType T) {
// FIXME: Depending on whether we choose to deprecate structural symbols,
// this may become much stricter.
return !T.isNull() && !T->isVoidType();
}
mutable unsigned Complexity = 0;
public:
virtual ~SymExpr() = default;
Kind getKind() const { return K; }
virtual void dump() const;
virtual void dumpToStream(raw_ostream &os) const {}
virtual QualType getType() const = 0;
virtual void Profile(llvm::FoldingSetNodeID &profile) = 0;
/// Iterator over symbols that the current symbol depends on.
///
/// For SymbolData, it's the symbol itself; for expressions, it's the
/// expression symbol and all the operands in it. Note, SymbolDerived is
/// treated as SymbolData - the iterator will NOT visit the parent region.
class symbol_iterator {
SmallVector<const SymExpr *, 5> itr;
void expand();
public:
symbol_iterator() = default;
symbol_iterator(const SymExpr *SE);
symbol_iterator &operator++();
const SymExpr *operator*();
bool operator==(const symbol_iterator &X) const;
bool operator!=(const symbol_iterator &X) const;
};
symbol_iterator symbol_begin() const { return symbol_iterator(this); }
static symbol_iterator symbol_end() { return symbol_iterator(); }
virtual unsigned computeComplexity() const = 0;
/// Find the region from which this symbol originates.
///
/// Whenever the symbol was constructed to denote an unknown value of
/// a certain memory region, return this region. This method
/// allows checkers to make decisions depending on the origin of the symbol.
/// Symbol classes for which the origin region is known include
/// SymbolRegionValue which denotes the value of the region before
/// the beginning of the analysis, and SymbolDerived which denotes the value
/// of a certain memory region after its super region (a memory space or
/// a larger record region) is default-bound with a certain symbol.
virtual const MemRegion *getOriginRegion() const { return nullptr; }
};
inline raw_ostream &operator<<(raw_ostream &os,
const clang::ento::SymExpr *SE) {
SE->dumpToStream(os);
return os;
}
using SymbolRef = const SymExpr *;
using SymbolRefSmallVectorTy = SmallVector<SymbolRef, 2>;
using SymbolID = unsigned;
/// A symbol representing data which can be stored in a memory location
/// (region).
class SymbolData : public SymExpr {
const SymbolID Sym;
void anchor() override;
protected:
SymbolData(Kind k, SymbolID sym) : SymExpr(k), Sym(sym) {
assert(classof(this));
}
public:
~SymbolData() override = default;
SymbolID getSymbolID() const { return Sym; }
unsigned computeComplexity() const override {
return 1;
};
// Implement isa<T> support.
static inline bool classof(const SymExpr *SE) {
Kind k = SE->getKind();
return k >= BEGIN_SYMBOLS && k <= END_SYMBOLS;
}
};
} // namespace ento
} // namespace clang
#endif // LLVM_CLANG_STATICANALYZER_CORE_PATHSENSITIVE_SYMEXPR_H
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