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//== SymbolManager.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 SymbolManager, a class that manages symbolic values
// created for use by GRExprEngine and related classes.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_ANALYSIS_SYMMGR_H
#define LLVM_CLANG_ANALYSIS_SYMMGR_H
#include "clang/AST/Decl.h"
#include "clang/AST/Expr.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/Allocator.h"
namespace clang {
class SymbolManager;
class SymbolID {
unsigned Data;
public:
SymbolID() : Data(~0U - 2) {}
SymbolID(unsigned x) : Data(x) {}
bool isInitialized() const { return Data != (unsigned) (~0U - 2); }
operator unsigned() const { return getNumber(); }
unsigned getNumber() const { assert (isInitialized()); return Data; }
void Profile(llvm::FoldingSetNodeID& ID) const {
assert (isInitialized());
ID.AddInteger(Data);
}
};
} // end clang namespace
namespace llvm {
template <> struct DenseMapInfo<clang::SymbolID> {
static inline clang::SymbolID getEmptyKey() {
return clang::SymbolID(~0U);
}
static inline clang::SymbolID getTombstoneKey() {
return clang::SymbolID(~0U - 1);
}
static unsigned getHashValue(clang::SymbolID X) {
return X.getNumber();
}
static bool isEqual(clang::SymbolID X, clang::SymbolID Y) {
return X.getNumber() == Y.getNumber();
}
static bool isPod() { return true; }
};
}
// SymbolData: Used to record meta data about symbols.
namespace clang {
class SymbolData : public llvm::FoldingSetNode {
public:
enum Kind { UndefKind, ParmKind, GlobalKind, ContentsOfKind, ConjuredKind };
private:
Kind K;
SymbolID Sym;
protected:
SymbolData(Kind k, SymbolID sym) : K(k), Sym(sym) {}
public:
virtual ~SymbolData() {}
Kind getKind() const { return K; }
SymbolID getSymbol() const { return Sym; }
QualType getType(const SymbolManager& SymMgr) const;
virtual void Profile(llvm::FoldingSetNodeID& profile) = 0;
// Implement isa<T> support.
static inline bool classof(const SymbolData*) { return true; }
};
class SymbolDataParmVar : public SymbolData {
ParmVarDecl *VD;
public:
SymbolDataParmVar(SymbolID MySym, ParmVarDecl* vd)
: SymbolData(ParmKind, MySym), VD(vd) {}
ParmVarDecl* getDecl() const { return VD; }
static void Profile(llvm::FoldingSetNodeID& profile, ParmVarDecl* VD) {
profile.AddInteger((unsigned) ParmKind);
profile.AddPointer(VD);
}
virtual void Profile(llvm::FoldingSetNodeID& profile) {
Profile(profile, VD);
}
// Implement isa<T> support.
static inline bool classof(const SymbolData* D) {
return D->getKind() == ParmKind;
}
};
class SymbolDataGlobalVar : public SymbolData {
VarDecl *VD;
public:
SymbolDataGlobalVar(SymbolID MySym, VarDecl* vd) :
SymbolData(GlobalKind, MySym), VD(vd) {}
VarDecl* getDecl() const { return VD; }
static void Profile(llvm::FoldingSetNodeID& profile, VarDecl* VD) {
profile.AddInteger((unsigned) GlobalKind);
profile.AddPointer(VD);
}
virtual void Profile(llvm::FoldingSetNodeID& profile) {
Profile(profile, VD);
}
// Implement isa<T> support.
static inline bool classof(const SymbolData* D) {
return D->getKind() == GlobalKind;
}
};
class SymbolDataContentsOf : public SymbolData {
SymbolID Sym;
public:
SymbolDataContentsOf(SymbolID MySym, SymbolID sym) :
SymbolData(ContentsOfKind, MySym), Sym(sym) {}
SymbolID getContainerSymbol() const { return Sym; }
static void Profile(llvm::FoldingSetNodeID& profile, SymbolID Sym) {
profile.AddInteger((unsigned) ContentsOfKind);
profile.AddInteger(Sym);
}
virtual void Profile(llvm::FoldingSetNodeID& profile) {
Profile(profile, Sym);
}
// Implement isa<T> support.
static inline bool classof(const SymbolData* D) {
return D->getKind() == ContentsOfKind;
}
};
class SymbolConjured : public SymbolData {
Expr* E;
unsigned Count;
public:
SymbolConjured(SymbolID Sym, Expr* exp, unsigned count)
: SymbolData(ConjuredKind, Sym), E(exp), Count(count) {}
Expr* getExpr() const { return E; }
unsigned getCount() const { return Count; }
static void Profile(llvm::FoldingSetNodeID& profile,
Expr* E, unsigned Count) {
profile.AddInteger((unsigned) ConjuredKind);
profile.AddPointer(E);
profile.AddInteger(Count);
}
virtual void Profile(llvm::FoldingSetNodeID& profile) {
Profile(profile, E, Count);
}
// Implement isa<T> support.
static inline bool classof(const SymbolData* D) {
return D->getKind() == ConjuredKind;
}
};
// Constraints on symbols. Usually wrapped by RValues.
class SymIntConstraint : public llvm::FoldingSetNode {
SymbolID Symbol;
BinaryOperator::Opcode Op;
const llvm::APSInt& Val;
public:
SymIntConstraint(SymbolID sym, BinaryOperator::Opcode op,
const llvm::APSInt& V)
: Symbol(sym),
Op(op), Val(V) {}
BinaryOperator::Opcode getOpcode() const { return Op; }
const SymbolID& getSymbol() const { return Symbol; }
const llvm::APSInt& getInt() const { return Val; }
static inline void Profile(llvm::FoldingSetNodeID& ID,
SymbolID Symbol,
BinaryOperator::Opcode Op,
const llvm::APSInt& Val) {
Symbol.Profile(ID);
ID.AddInteger(Op);
ID.AddPointer(&Val);
}
void Profile(llvm::FoldingSetNodeID& ID) {
Profile(ID, Symbol, Op, Val);
}
};
class SymbolManager {
typedef llvm::FoldingSet<SymbolData> DataSetTy;
typedef llvm::DenseMap<SymbolID, SymbolData*> DataMapTy;
DataSetTy DataSet;
DataMapTy DataMap;
unsigned SymbolCounter;
llvm::BumpPtrAllocator& BPAlloc;
public:
SymbolManager(llvm::BumpPtrAllocator& bpalloc)
: SymbolCounter(0), BPAlloc(bpalloc) {}
~SymbolManager();
SymbolID getSymbol(VarDecl* D);
SymbolID getContentsOfSymbol(SymbolID sym);
SymbolID getConjuredSymbol(Expr* E, unsigned VisitCount);
const SymbolData& getSymbolData(SymbolID ID) const;
QualType getType(SymbolID ID) const {
return getSymbolData(ID).getType(*this);
}
};
} // end clang namespace
#endif
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