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//===--- DeclGroup.h - Classes for representing groups of Decls -*- 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 the DeclGroup, DeclGroupRef, and OwningDeclGroup classes.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_DECLGROUP_H
#define LLVM_CLANG_AST_DECLGROUP_H
#include "llvm/Support/DataTypes.h"
#include "llvm/Bitcode/SerializationFwd.h"
#include <cassert>
namespace clang {
class ASTContext;
class Decl;
class DeclGroup;
class DeclGroupIterator;
class DeclGroup {
// FIXME: Include a TypeSpecifier object.
unsigned NumDecls;
private:
DeclGroup() : NumDecls(0) {}
DeclGroup(unsigned numdecls, Decl** decls);
public:
static DeclGroup* Create(ASTContext& C, unsigned numdecls, Decl** decls);
void Destroy(ASTContext& C);
unsigned size() const { return NumDecls; }
Decl*& operator[](unsigned i) {
assert (i < NumDecls && "Out-of-bounds access.");
return *((Decl**) (this+1));
}
Decl* const& operator[](unsigned i) const {
assert (i < NumDecls && "Out-of-bounds access.");
return *((Decl* const*) (this+1));
}
/// Emit - Serialize a DeclGroup to Bitcode.
void Emit(llvm::Serializer& S) const;
/// Read - Deserialize a DeclGroup from Bitcode.
static DeclGroup* Read(llvm::Deserializer& D, ASTContext& C);
};
class DeclGroupRef {
enum Kind { SingleDeclKind=0x0, DeclGroupKind=0x1, Mask=0x1 };
Decl* D;
Kind getKind() const {
return (Kind) (reinterpret_cast<uintptr_t>(D) & Mask);
}
public:
DeclGroupRef() : D(0) {}
explicit DeclGroupRef(Decl* d) : D(d) {}
explicit DeclGroupRef(DeclGroup* dg)
: D((Decl*) (reinterpret_cast<uintptr_t>(dg) | DeclGroupKind)) {}
typedef Decl** iterator;
typedef Decl* const * const_iterator;
bool isSingleDecl() const { return getKind() == SingleDeclKind; }
bool isDeclGroup() const { return getKind() == DeclGroupKind; }
Decl *getSingleDecl() {
assert(isSingleDecl() && "Isn't a declgroup");
return D;
}
const Decl *getSingleDecl() const {
return const_cast<DeclGroupRef*>(this)->getSingleDecl();
}
DeclGroup &getDeclGroup() {
assert(isDeclGroup() && "Isn't a declgroup");
return *((DeclGroup*)(reinterpret_cast<uintptr_t>(D) & ~Mask));
}
const DeclGroup &getDeclGroup() const {
return const_cast<DeclGroupRef*>(this)->getDeclGroup();
}
iterator begin() {
if (isSingleDecl())
return D ? &D : 0;
return &getDeclGroup()[0];
}
iterator end() {
if (isSingleDecl())
return D ? &D+1 : 0;
DeclGroup &G = getDeclGroup();
return &G[0] + G.size();
}
const_iterator begin() const {
if (isSingleDecl())
return D ? &D : 0;
return &getDeclGroup()[0];
}
const_iterator end() const {
if (isSingleDecl())
return D ? &D+1 : 0;
const DeclGroup &G = getDeclGroup();
return &G[0] + G.size();
}
void *getAsOpaquePtr() const { return D; }
static DeclGroupRef getFromOpaquePtr(void *Ptr) {
DeclGroupRef X;
X.D = static_cast<Decl*>(Ptr);
return X;
}
/// Emit - Serialize a DeclGroupRef to Bitcode.
void Emit(llvm::Serializer& S) const;
/// Read - Deserialize a DeclGroupRef from Bitcode.
static DeclGroupRef ReadVal(llvm::Deserializer& D);
};
} // end clang namespace
namespace llvm {
// DeclGroupRef is "like a pointer", implement PointerLikeTypeTraits.
template <typename T>
class PointerLikeTypeTraits;
template <>
class PointerLikeTypeTraits<clang::DeclGroupRef> {
public:
static inline void *getAsVoidPointer(clang::DeclGroupRef P) {
return P.getAsOpaquePtr();
}
static inline clang::DeclGroupRef getFromVoidPointer(void *P) {
return clang::DeclGroupRef::getFromOpaquePtr(P);
}
enum { NumLowBitsAvailable = 0 };
};
}
#endif
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