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TypeAlignments.h predates this whole mess; it was used for types with stronger alignment in PointerLikeTypeTraits than the old default of "2 by fiat and assumption". All remaining forward-declared types are AST types, so fold them into TypeAlignments.h. (The one exception is SILTypeList.h, but that's already gone on master.) To avoid future ODR issues, explicitly include TypeAlignments.h into every header that defines a type it forward-declares. I wish we could use partial specialization to provide PointerLikeTypeTraits for all derived classes of Decl, TypeBase, etc, but that's not something you can do in C++ if you don't control the traits class.
68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
//===--- ASTNode.h - Swift Language ASTs ------------------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the ASTNode, which is a union of Stmt, Expr, and Decl.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_AST_AST_NODE_H
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#define SWIFT_AST_AST_NODE_H
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#include "llvm/ADT/PointerUnion.h"
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#include "swift/AST/TypeAlignments.h"
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namespace swift {
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class Expr;
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class Stmt;
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class Decl;
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class SourceLoc;
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class SourceRange;
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class ASTWalker;
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struct ASTNode : public llvm::PointerUnion3<Expr*, Stmt*, Decl*> {
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// Inherit the constructors from PointerUnion.
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using PointerUnion3::PointerUnion3;
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SourceRange getSourceRange() const;
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/// \brief Return the location of the start of the statement.
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SourceLoc getStartLoc() const;
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/// \brief Return the location of the end of the statement.
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SourceLoc getEndLoc() const;
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void walk(ASTWalker &Walker);
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void walk(ASTWalker &&walker) { walk(walker); }
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};
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} // namespace swift
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namespace llvm {
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using swift::ASTNode;
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template <> struct DenseMapInfo<ASTNode> {
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static inline ASTNode getEmptyKey() {
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return DenseMapInfo<swift::Expr *>::getEmptyKey();
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}
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static inline ASTNode getTombstoneKey() {
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return DenseMapInfo<swift::Expr *>::getTombstoneKey();
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}
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static unsigned getHashValue(const ASTNode Val) {
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return DenseMapInfo<void *>::getHashValue(Val.getOpaqueValue());
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}
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static bool isEqual(const ASTNode LHS, const ASTNode RHS) {
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return LHS.getOpaqueValue() == RHS.getOpaqueValue();
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}
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};
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}
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#endif // LLVM_SWIFT_AST_AST_NODE_H
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