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//===- DeclGroup.h - Classes for representing groups of Decls ---*- 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
//
//===----------------------------------------------------------------------===//
//
// This file defines the DeclGroup, DeclGroupRef, and OwningDeclGroup classes.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_DECLGROUP_H
#define LLVM_CLANG_AST_DECLGROUP_H
#include "llvm/Support/TrailingObjects.h"
#include <cassert>
#include <cstdint>
namespace clang {
class ASTContext;
class Decl;
class DeclGroup final : private llvm::TrailingObjects<DeclGroup, Decl *> {
// FIXME: Include a TypeSpecifier object.
unsigned NumDecls = 0;
private:
DeclGroup() = default;
DeclGroup(unsigned numdecls, Decl** decls);
public:
friend TrailingObjects;
static DeclGroup *Create(ASTContext &C, Decl **Decls, unsigned NumDecls);
unsigned size() const { return NumDecls; }
Decl*& operator[](unsigned i) {
assert (i < NumDecls && "Out-of-bounds access.");
return getTrailingObjects<Decl *>()[i];
}
Decl* const& operator[](unsigned i) const {
assert (i < NumDecls && "Out-of-bounds access.");
return getTrailingObjects<Decl *>()[i];
}
};
class DeclGroupRef {
// Note this is not a PointerIntPair because we need the address of the
// non-group case to be valid as a Decl** for iteration.
enum Kind { SingleDeclKind=0x0, DeclGroupKind=0x1, Mask=0x1 };
Decl* D = nullptr;
Kind getKind() const {
return (Kind) (reinterpret_cast<uintptr_t>(D) & Mask);
}
public:
DeclGroupRef() = default;
explicit DeclGroupRef(Decl* d) : D(d) {}
explicit DeclGroupRef(DeclGroup* dg)
: D((Decl*) (reinterpret_cast<uintptr_t>(dg) | DeclGroupKind)) {}
static DeclGroupRef Create(ASTContext &C, Decl **Decls, unsigned NumDecls) {
if (NumDecls == 0)
return DeclGroupRef();
if (NumDecls == 1)
return DeclGroupRef(Decls[0]);
return DeclGroupRef(DeclGroup::Create(C, Decls, NumDecls));
}
using iterator = Decl **;
using const_iterator = Decl * const *;
bool isNull() const { return D == nullptr; }
bool isSingleDecl() const { return getKind() == SingleDeclKind; }
bool isDeclGroup() const { return getKind() == DeclGroupKind; }
Decl *getSingleDecl() {
assert(isSingleDecl() && "Isn't a single decl");
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 : nullptr;
return &getDeclGroup()[0];
}
iterator end() {
if (isSingleDecl())
return D ? &D+1 : nullptr;
DeclGroup &G = getDeclGroup();
return &G[0] + G.size();
}
const_iterator begin() const {
if (isSingleDecl())
return D ? &D : nullptr;
return &getDeclGroup()[0];
}
const_iterator end() const {
if (isSingleDecl())
return D ? &D+1 : nullptr;
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;
}
};
} // namespace clang
namespace llvm {
// DeclGroupRef is "like a pointer", implement PointerLikeTypeTraits.
template <typename T>
struct PointerLikeTypeTraits;
template <>
struct PointerLikeTypeTraits<clang::DeclGroupRef> {
static inline void *getAsVoidPointer(clang::DeclGroupRef P) {
return P.getAsOpaquePtr();
}
static inline clang::DeclGroupRef getFromVoidPointer(void *P) {
return clang::DeclGroupRef::getFromOpaquePtr(P);
}
static constexpr int NumLowBitsAvailable = 0;
};
} // namespace llvm
#endif // LLVM_CLANG_AST_DECLGROUP_H
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