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fix swift_getFieldAt symbol missing in Swift 5
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chantu
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Feb 2, 2019
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| // | ||
| // FieldDescriptor.swift | ||
| // HandyJSON | ||
| // | ||
| // Created by chantu on 2019/1/31. | ||
| // Copyright © 2019 aliyun. All rights reserved. | ||
| // | ||
|
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||
| import Foundation | ||
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| enum FieldDescriptorKind : UInt16 { | ||
| // Swift nominal types. | ||
| case Struct = 0 | ||
| case Class | ||
| case Enum | ||
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| // Fixed-size multi-payload enums have a special descriptor format that | ||
| // encodes spare bits. | ||
| // | ||
| // FIXME: Actually implement this. For now, a descriptor with this kind | ||
| // just means we also have a builtin descriptor from which we get the | ||
| // size and alignment. | ||
| case MultiPayloadEnum | ||
|
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| // A Swift opaque protocol. There are no fields, just a record for the | ||
| // type itself. | ||
| case `Protocol` | ||
|
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| // A Swift class-bound protocol. | ||
| case ClassProtocol | ||
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| // An Objective-C protocol, which may be imported or defined in Swift. | ||
| case ObjCProtocol | ||
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| // An Objective-C class, which may be imported or defined in Swift. | ||
| // In the former case, field type metadata is not emitted, and | ||
| // must be obtained from the Objective-C runtime. | ||
| case ObjCClass | ||
| } | ||
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| struct FieldDescriptor: PointerType { | ||
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| var pointer: UnsafePointer<_FieldDescriptor> | ||
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| var fieldRecordSize: Int { | ||
| return Int(pointer.pointee.fieldRecordSize) | ||
| } | ||
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| var numFields: Int { | ||
| return Int(pointer.pointee.numFields) | ||
| } | ||
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| var fieldRecords: [FieldRecord] { | ||
| return (0..<numFields).map({ (i) -> FieldRecord in | ||
| return FieldRecord(pointer: UnsafePointer<_FieldRecord>(pointer + 1) + i) | ||
| }) | ||
| } | ||
| } | ||
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| struct _FieldDescriptor { | ||
| var mangledTypeNameOffset: Int32 | ||
| var superClassOffset: Int32 | ||
| var fieldDescriptorKind: FieldDescriptorKind | ||
| var fieldRecordSize: Int16 | ||
| var numFields: Int32 | ||
| } | ||
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| struct FieldRecord: PointerType { | ||
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| var pointer: UnsafePointer<_FieldRecord> | ||
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| var fieldRecordFlags: Int { | ||
| return Int(pointer.pointee.fieldRecordFlags) | ||
| } | ||
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| var mangledTypeName: UnsafePointer<UInt8>? { | ||
| let address = Int(bitPattern: pointer) + 1 * 4 | ||
| let offset = Int(pointer.pointee.mangledTypeNameOffset) | ||
| let cString = UnsafePointer<UInt8>(bitPattern: address + offset) | ||
| return cString | ||
| } | ||
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| var fieldName: String { | ||
| let address = Int(bitPattern: pointer) + 2 * 4 | ||
| let offset = Int(pointer.pointee.fieldNameOffset) | ||
| if let cString = UnsafePointer<UInt8>(bitPattern: address + offset) { | ||
| return String(cString: cString) | ||
| } | ||
| return "" | ||
| } | ||
| } | ||
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| struct _FieldRecord { | ||
| var fieldRecordFlags: Int32 | ||
| var mangledTypeNameOffset: Int32 | ||
| var fieldNameOffset: Int32 | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| // | ||
| // MangledName.swift | ||
| // HandyJSON | ||
| // | ||
| // Created by chantu on 2019/2/2. | ||
| // Copyright © 2019 aliyun. All rights reserved. | ||
| // | ||
|
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| import Foundation | ||
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| // mangled name might contain 0 but it is not the end, do not just use strlen | ||
| func getMangledTypeNameSize(_ mangledName: UnsafePointer<UInt8>) -> Int { | ||
| // TODO: should find the actually size | ||
| return 256 | ||
| } |
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swift5.0 报错
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Xcode 10.2 Undefined symbol: _swift_getFieldAt