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e9b643026b
DeclContexts as they exist today are "over aligned" when compared to their natural alignment boundary and therefore they can easily cause adjacent padding when dropped into the middle of objects via C++ inheritance, or when the clang importer prefaces Swift AST allocations with a pointer to the corresponding clang AST node. With this change, we move DeclContexts to the front of the memory layout of AST nodes. This allows us to restore natural alignment, save memory, and as a side effect: more easily avoid "over alignment" in the future because DeclContexts now only need to directly track which AST node hierarchy they're associated with, not specific AST nodes within each hierarchy. Finally, as a word of caution, after this change one can no longer assume that AST nodes safely convert back and forth with "void*". For example, WitnessTableEntry needed fixing with this change.
196 lines
6.9 KiB
C++
196 lines
6.9 KiB
C++
//===--- ExprNodes.def - Swift Expression AST Metaprogramming ---*- 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 - 2017 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 https://swift.org/LICENSE.txt for license information
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// See https://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 macros used for macro-metaprogramming with expressions.
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//
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//===----------------------------------------------------------------------===//
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/// EXPR(Id, Parent)
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/// If the expression node is not abstract, its enumerator value is
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/// ExprKind::Id. The node's class name is Id##Expr, and the name of
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/// its base class (in the Expr hierarchy) is Parent.
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#ifndef EXPR
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#define EXPR(Id, Parent)
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#endif
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/// An abstract expression node is an abstract base class in the hierarchy;
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/// it is never a most-derived type, and it does not have an enumerator in
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/// ExprKind.
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///
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/// Most metaprograms do not care about abstract expressions, so the default
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/// is to ignore them.
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#ifndef ABSTRACT_EXPR
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#define ABSTRACT_EXPR(Id, Parent)
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#endif
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/// An "unchecked" expression node is removed from valid code by the end
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/// of the type-checking phase.
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///
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/// By default, these are treated like any other expression.
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#ifndef UNCHECKED_EXPR
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#define UNCHECKED_EXPR(Id, Parent) EXPR(Id, Parent)
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#endif
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/// A literal expression node represents a literal value, such as a number,
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/// boolean, string, etc.
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///
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/// By default, these are treated like any other expression.
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#ifndef LITERAL_EXPR
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#define LITERAL_EXPR(Id, Parent) EXPR(Id, Parent)
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#endif
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/// A expression node with a DeclContext. For example: closures.
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///
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/// By default, these are treated like any other expression.
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#ifndef CONTEXT_EXPR
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#define CONTEXT_EXPR(Id, Parent) EXPR(Id, Parent)
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#endif
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/// A convenience for determining the range of expressions. These will always
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/// appear immediately after the last member.
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#ifndef EXPR_RANGE
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#define EXPR_RANGE(Id, First, Last)
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#endif
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#ifndef LAST_EXPR
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#define LAST_EXPR(Id)
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#endif
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EXPR(Error, Expr)
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ABSTRACT_EXPR(Literal, Expr)
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LITERAL_EXPR(NilLiteral, LiteralExpr)
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ABSTRACT_EXPR(NumberLiteral, LiteralExpr)
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LITERAL_EXPR(IntegerLiteral, NumberLiteralExpr)
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LITERAL_EXPR(FloatLiteral, NumberLiteralExpr)
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EXPR_RANGE(NumberLiteral, IntegerLiteral, FloatLiteral)
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LITERAL_EXPR(BooleanLiteral, LiteralExpr)
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LITERAL_EXPR(StringLiteral, LiteralExpr)
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LITERAL_EXPR(InterpolatedStringLiteral, LiteralExpr)
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LITERAL_EXPR(ObjectLiteral, LiteralExpr)
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LITERAL_EXPR(MagicIdentifierLiteral, LiteralExpr)
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EXPR_RANGE(Literal, NilLiteral, MagicIdentifierLiteral)
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EXPR(DiscardAssignment, Expr)
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EXPR(DeclRef, Expr)
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EXPR(SuperRef, Expr)
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EXPR(Type, Expr)
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EXPR(OtherConstructorDeclRef, Expr)
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EXPR(DotSyntaxBaseIgnored, Expr)
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ABSTRACT_EXPR(OverloadSetRef, Expr)
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UNCHECKED_EXPR(OverloadedDeclRef, OverloadSetRefExpr)
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EXPR_RANGE(OverloadSetRef, OverloadedDeclRef, OverloadedDeclRef)
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UNCHECKED_EXPR(UnresolvedDeclRef, Expr)
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EXPR(MemberRef, Expr)
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ABSTRACT_EXPR(DynamicLookup, Expr)
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EXPR(DynamicMemberRef, DynamicLookupExpr)
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EXPR(DynamicSubscript, DynamicLookupExpr)
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EXPR_RANGE(DynamicLookup, DynamicMemberRef, DynamicSubscript)
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UNCHECKED_EXPR(UnresolvedSpecialize, Expr)
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UNCHECKED_EXPR(UnresolvedMember, Expr)
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UNCHECKED_EXPR(UnresolvedDot, Expr)
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UNCHECKED_EXPR(Sequence, Expr)
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ABSTRACT_EXPR(Identity, Expr)
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EXPR(Paren, IdentityExpr)
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EXPR(DotSelf, IdentityExpr)
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EXPR_RANGE(Identity, Paren, DotSelf)
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ABSTRACT_EXPR(AnyTry, Expr)
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EXPR(Try, AnyTryExpr)
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EXPR(ForceTry, AnyTryExpr)
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EXPR(OptionalTry, AnyTryExpr)
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EXPR_RANGE(AnyTry, Try, OptionalTry)
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EXPR(Tuple, Expr)
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ABSTRACT_EXPR(Collection, Expr)
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EXPR(Array, CollectionExpr)
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EXPR(Dictionary, CollectionExpr)
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EXPR_RANGE(Collection, Array, Dictionary)
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EXPR(Subscript, Expr)
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EXPR(KeyPathApplication, Expr)
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EXPR(TupleElement, Expr)
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EXPR(CaptureList, Expr)
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ABSTRACT_EXPR(AbstractClosure, Expr)
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CONTEXT_EXPR(Closure, AbstractClosureExpr)
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CONTEXT_EXPR(AutoClosure, AbstractClosureExpr)
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EXPR_RANGE(AbstractClosure, Closure, AutoClosure)
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EXPR(InOut, Expr)
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EXPR(DynamicType, Expr)
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EXPR(RebindSelfInConstructor, Expr)
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EXPR(OpaqueValue, Expr)
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EXPR(BindOptional, Expr)
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EXPR(OptionalEvaluation, Expr)
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EXPR(ForceValue, Expr)
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EXPR(OpenExistential, Expr)
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EXPR(MakeTemporarilyEscapable, Expr)
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ABSTRACT_EXPR(Apply, Expr)
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EXPR(Call, ApplyExpr)
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EXPR(PrefixUnary, ApplyExpr)
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EXPR(PostfixUnary, ApplyExpr)
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EXPR(Binary, ApplyExpr)
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ABSTRACT_EXPR(SelfApply, ApplyExpr)
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EXPR(DotSyntaxCall, SelfApplyExpr)
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EXPR(ConstructorRefCall, SelfApplyExpr)
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EXPR_RANGE(SelfApply, DotSyntaxCall, ConstructorRefCall)
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EXPR_RANGE(Apply, Call, ConstructorRefCall)
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ABSTRACT_EXPR(ImplicitConversion, Expr)
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EXPR(Load, ImplicitConversionExpr)
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EXPR(TupleShuffle, ImplicitConversionExpr)
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EXPR(UnresolvedTypeConversion, ImplicitConversionExpr)
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EXPR(FunctionConversion, ImplicitConversionExpr)
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EXPR(CovariantFunctionConversion, ImplicitConversionExpr)
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EXPR(CovariantReturnConversion, ImplicitConversionExpr)
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EXPR(ImplicitlyUnwrappedFunctionConversion, ImplicitConversionExpr)
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EXPR(MetatypeConversion, ImplicitConversionExpr)
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EXPR(CollectionUpcastConversion, ImplicitConversionExpr)
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EXPR(Erasure, ImplicitConversionExpr)
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EXPR(AnyHashableErasure, ImplicitConversionExpr)
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EXPR(BridgeToObjC, ImplicitConversionExpr)
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EXPR(BridgeFromObjC, ImplicitConversionExpr)
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EXPR(ConditionalBridgeFromObjC, ImplicitConversionExpr)
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EXPR(DerivedToBase, ImplicitConversionExpr)
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EXPR(ArchetypeToSuper, ImplicitConversionExpr)
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EXPR(InjectIntoOptional, ImplicitConversionExpr)
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EXPR(ClassMetatypeToObject, ImplicitConversionExpr)
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EXPR(ExistentialMetatypeToObject, ImplicitConversionExpr)
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EXPR(ProtocolMetatypeToObject, ImplicitConversionExpr)
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EXPR(InOutToPointer, ImplicitConversionExpr)
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EXPR(ArrayToPointer, ImplicitConversionExpr)
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EXPR(StringToPointer, ImplicitConversionExpr)
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EXPR(PointerToPointer, ImplicitConversionExpr)
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EXPR(ForeignObjectConversion, ImplicitConversionExpr)
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EXPR(UnevaluatedInstance, ImplicitConversionExpr)
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EXPR_RANGE(ImplicitConversion, Load, UnevaluatedInstance)
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ABSTRACT_EXPR(ExplicitCast, Expr)
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ABSTRACT_EXPR(CheckedCast, ExplicitCastExpr)
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EXPR(ForcedCheckedCast, CheckedCastExpr)
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EXPR(ConditionalCheckedCast, CheckedCastExpr)
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EXPR(Is, CheckedCastExpr)
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EXPR_RANGE(CheckedCast, ForcedCheckedCast, Is)
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EXPR(Coerce, ExplicitCastExpr)
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EXPR_RANGE(ExplicitCast, ForcedCheckedCast, Coerce)
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UNCHECKED_EXPR(Arrow, Expr)
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EXPR(If, Expr)
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EXPR(EnumIsCase, Expr)
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EXPR(Assign, Expr)
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EXPR(CodeCompletion, Expr)
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UNCHECKED_EXPR(UnresolvedPattern, Expr)
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EXPR(EditorPlaceholder, Expr)
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EXPR(ObjCSelector, Expr)
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EXPR(KeyPath, Expr)
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UNCHECKED_EXPR(KeyPathDot, Expr)
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LAST_EXPR(KeyPathDot)
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#undef EXPR_RANGE
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#undef LITERAL_EXPR
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#undef UNCHECKED_EXPR
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#undef ABSTRACT_EXPR
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#undef CONTEXT_EXPR
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#undef EXPR
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#undef LAST_EXPR
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