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b727b6d932
This patch adds the ability (-enable-experimental-unavailable-as-optional) to treat potentially unavailable declarations as if they had optional types. For the moment, this is only implemented for global variables. The high-level approach is to (1) record the potential unavailability of a declaration reference in the overload choice during constraint generation; (2) treat the declaration as if it had an optional type during overload resolution (this is similar to how optional protocol members are treated); and (3) add an implicit conversion (UnavailableToOptionalExpr) during constraint application to represent the run-time availability check and optional injection. This patch does not implement SILGen for UnavailableToOptionalExpr. Swift SVN r22245
162 lines
5.9 KiB
C++
162 lines
5.9 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 - 2015 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 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 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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EXPR(Error, Expr)
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ABSTRACT_EXPR(Literal, Expr)
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EXPR(NilLiteral, LiteralExpr)
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EXPR(IntegerLiteral, LiteralExpr)
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EXPR(FloatLiteral, LiteralExpr)
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EXPR(BooleanLiteral, LiteralExpr)
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EXPR(CharacterLiteral, LiteralExpr)
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EXPR(StringLiteral, LiteralExpr)
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EXPR(InterpolatedStringLiteral, LiteralExpr)
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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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UNCHECKED_EXPR(UnresolvedConstructor, 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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UNCHECKED_EXPR(OverloadedMemberRef, OverloadSetRefExpr)
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EXPR_RANGE(OverloadSetRef, OverloadedDeclRef, OverloadedMemberRef)
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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(UnresolvedSelector, 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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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(TupleElement, Expr)
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ABSTRACT_EXPR(AbstractClosure, Expr)
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EXPR(Closure, AbstractClosureExpr)
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EXPR(AutoClosure, AbstractClosureExpr)
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EXPR_RANGE(AbstractClosure, Closure, AutoClosure)
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EXPR(Module, Expr)
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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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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(FunctionConversion, ImplicitConversionExpr)
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EXPR(CovariantFunctionConversion, ImplicitConversionExpr)
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EXPR(CovariantReturnConversion, ImplicitConversionExpr)
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EXPR(MetatypeConversion, ImplicitConversionExpr)
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EXPR(CollectionUpcastConversion, ImplicitConversionExpr)
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ABSTRACT_EXPR(AnyErasure, ImplicitConversionExpr)
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EXPR(Erasure, AnyErasureExpr)
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EXPR(MetatypeErasure, AnyErasureExpr)
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EXPR_RANGE(AnyErasure, Erasure, MetatypeErasure)
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EXPR(DerivedToBase, ImplicitConversionExpr)
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EXPR(ArchetypeToSuper, ImplicitConversionExpr)
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EXPR(ScalarToTuple, ImplicitConversionExpr)
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EXPR(InjectIntoOptional, ImplicitConversionExpr)
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EXPR(UnavailableToOptional, 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(LValueToPointer, ImplicitConversionExpr)
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EXPR(ForeignObjectConversion, ImplicitConversionExpr)
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EXPR_RANGE(ImplicitConversion, Load, ForeignObjectConversion)
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ABSTRACT_EXPR(ExplicitCast, Expr)
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ABSTRACT_EXPR(CheckedCast, ExplicitCastExpr)
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UNCHECKED_EXPR(UnresolvedCheckedCast, CheckedCastExpr)
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EXPR(ForcedCheckedCast, CheckedCastExpr)
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EXPR(ConditionalCheckedCast, CheckedCastExpr)
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EXPR(Isa, CheckedCastExpr)
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EXPR_RANGE(CheckedCast, UnresolvedCheckedCast, Isa)
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EXPR(Coerce, ExplicitCastExpr)
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EXPR_RANGE(ExplicitCast, UnresolvedCheckedCast, Coerce)
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EXPR(If, Expr)
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EXPR(Assign, Expr)
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EXPR(DefaultValue, Expr)
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UNCHECKED_EXPR(UnresolvedPattern, Expr)
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EXPR(AvailabilityQuery, Expr)
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#undef EXPR_RANGE
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#undef UNCHECKED_EXPR
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#undef ABSTRACT_EXPR
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#undef EXPR
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