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//===--- WitnessTable.swift -----------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2022 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import AST
import SILBridging
public struct WitnessTable : CustomStringConvertible, NoReflectionChildren {
public let bridged: BridgedWitnessTable
public init(bridged: BridgedWitnessTable) { self.bridged = bridged }
public enum Entry : CustomStringConvertible, NoReflectionChildren {
case invalid
/// A witness table entry describing the witness for a method.
/// The witness can be nil in case dead function elimination has removed the method
/// or if the method was not serialized (for de-serialized witness tables).
case method(requirement: DeclRef, witness: Function?)
/// A witness table entry describing the witness for an associated type.
case associatedType(requirement: AssociatedTypeDecl, witness: CanonicalType)
/// A witness table entry describing the witness for an associated type's protocol requirement.
case associatedConformance(requirement: CanonicalType, protocol: ProtocolDecl, witness: Conformance)
/// A witness table entry referencing the protocol conformance for a refined base protocol.
case baseProtocol(requirement: ProtocolDecl, witness: Conformance)
fileprivate init(bridged: BridgedWitnessTableEntry) {
switch bridged.getKind() {
case .invalid:
self = .invalid
case .method:
self = .method(requirement: DeclRef(bridged: bridged.getMethodRequirement()),
witness: bridged.getMethodWitness().function)
case .associatedType:
self = .associatedType(requirement: bridged.getAssociatedTypeRequirement().getAs(AssociatedTypeDecl.self),
witness: CanonicalType(bridged: bridged.getAssociatedTypeWitness()))
case .associatedConformance:
self = .associatedConformance(requirement: CanonicalType(bridged: bridged.getAssociatedConformanceRequirement()),
protocol: bridged.getAssociatedConformanceDecl().getAs(ProtocolDecl.self),
witness: Conformance(bridged: bridged.getAssociatedConformanceWitness()))
case .baseProtocol:
self = .baseProtocol(requirement: bridged.getBaseProtocolRequirement().getAs(ProtocolDecl.self),
witness: Conformance(bridged: bridged.getBaseProtocolWitness()))
default:
fatalError("invalid witness table entry")
}
}
public var description: String {
return String(taking: bridged.getDebugDescription())
}
public var bridged: BridgedWitnessTableEntry {
switch self {
case .invalid:
return BridgedWitnessTableEntry.createInvalid()
case .method(let requirement, let witness):
return BridgedWitnessTableEntry.createMethod(requirement.bridged,
OptionalBridgedFunction(obj: witness?.bridged.obj))
case .associatedType(let requirement, let witness):
return BridgedWitnessTableEntry.createAssociatedType(requirement.bridged, witness.bridged)
case .associatedConformance(let requirement, let protocolDecl, let witness):
return BridgedWitnessTableEntry.createAssociatedConformance(requirement.bridged,
protocolDecl.bridged,
witness.bridged)
case .baseProtocol(let requirement, let witness):
return BridgedWitnessTableEntry.createBaseProtocol(requirement.bridged, witness.bridged)
}
}
}
public struct EntryArray : BridgedRandomAccessCollection {
fileprivate let bridgedTable: BridgedWitnessTable
public let count: Int
init(witnessTable: WitnessTable) {
self.bridgedTable = witnessTable.bridged
self.count = witnessTable.bridged.getNumEntries()
}
public var startIndex: Int { 0 }
public var endIndex: Int { count }
public subscript(_ index: Int) -> Entry {
precondition(index >= startIndex && index < endIndex)
return Entry(bridged: bridgedTable.getEntry(index))
}
}
public var entries: EntryArray { EntryArray(witnessTable: self) }
public var isDefinition: Bool { !bridged.isDeclaration() }
public var description: String {
return String(taking: bridged.getDebugDescription())
}
}
public struct DefaultWitnessTable : CustomStringConvertible, NoReflectionChildren {
public let bridged: BridgedDefaultWitnessTable
public init(bridged: BridgedDefaultWitnessTable) { self.bridged = bridged }
public typealias Entry = WitnessTable.Entry
public struct EntryArray : BridgedRandomAccessCollection {
fileprivate let bridgedTable: BridgedDefaultWitnessTable
public let count: Int
init(witnessTable: DefaultWitnessTable) {
self.bridgedTable = witnessTable.bridged
self.count = witnessTable.bridged.getNumEntries()
}
public var startIndex: Int { 0 }
public var endIndex: Int { count }
public subscript(_ index: Int) -> Entry {
precondition(index >= startIndex && index < endIndex)
return Entry(bridged: bridgedTable.getEntry(index))
}
}
public var entries: EntryArray { EntryArray(witnessTable: self) }
public var description: String {
return String(taking: bridged.getDebugDescription())
}
}
extension OptionalBridgedWitnessTable {
public var witnessTable: WitnessTable? {
if let table = table {
return WitnessTable(bridged: BridgedWitnessTable(table: table))
}
return nil
}
}
extension OptionalBridgedDefaultWitnessTable {
public var defaultWitnessTable: DefaultWitnessTable? {
if let table = table {
return DefaultWitnessTable(bridged: BridgedDefaultWitnessTable(table: table))
}
return nil
}
}
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