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GH-37938: [Swift] initial impl of C Data interface
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF licenses this file | ||
| // to you under the Apache License, Version 2.0 (the | ||
| // "License"); you may not use this file except in compliance | ||
| // with the License. You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
|
|
||
| import Foundation | ||
| import ArrowC | ||
| import Atomics | ||
|
|
||
| // The memory used by UnsafeAtomic is not automatically | ||
| // reclaimed. Since this value is initialized once | ||
| // and used until the program/app is closed it's | ||
| // memory will be released on program/app exit | ||
| let exportDataCounter: UnsafeAtomic<Int> = .create(0) | ||
|
|
||
| public class ArrowCExporter { | ||
| private class ExportData { | ||
| let id: Int | ||
| init() { | ||
| id = exportDataCounter.loadThenWrappingIncrement(ordering: .relaxed) | ||
| ArrowCExporter.exportedData[id] = self | ||
| } | ||
| } | ||
|
|
||
| private class ExportSchema: ExportData { | ||
| public let arrowTypeName: UnsafePointer<CChar> | ||
| public let nameCstr: UnsafePointer<CChar> | ||
| private let arrowType: ArrowType | ||
| private let name: String | ||
| init(_ arrowType: ArrowType, name: String = "") throws { | ||
| self.arrowType = arrowType | ||
| // keeping the name str to ensure the cstring buffer remains valid | ||
| self.name = name | ||
| self.arrowTypeName = (try arrowType.cDataFormatId as NSString).utf8String! | ||
| self.nameCstr = (name as NSString).utf8String! | ||
| super.init() | ||
| } | ||
| } | ||
|
|
||
| private class ExportArray: ExportData { | ||
| private let arrowData: ArrowData | ||
| private(set) var data = [UnsafeRawPointer?]() | ||
| private(set) var buffers: UnsafeMutablePointer<UnsafeRawPointer?> | ||
| init(_ arrowData: ArrowData) { | ||
| // keep a reference to the ArrowData | ||
| // obj so the memory doesn't get | ||
| // deallocated | ||
| self.arrowData = arrowData | ||
| for arrowBuffer in arrowData.buffers { | ||
| data.append(arrowBuffer.rawPointer) | ||
| } | ||
|
|
||
| self.buffers = UnsafeMutablePointer(mutating: data) | ||
| super.init() | ||
| } | ||
| } | ||
|
|
||
| private static var exportedData = [Int: ExportData]() | ||
| public init() {} | ||
|
|
||
| public func exportType(_ cSchema: inout ArrowC.ArrowSchema, arrowType: ArrowType, name: String = "") -> | ||
| Result<Bool, ArrowError> { | ||
| do { | ||
| let exportSchema = try ExportSchema(arrowType, name: name) | ||
| cSchema.format = exportSchema.arrowTypeName | ||
| cSchema.name = exportSchema.nameCstr | ||
| cSchema.private_data = | ||
| UnsafeMutableRawPointer(mutating: UnsafeRawPointer(bitPattern: exportSchema.id)) | ||
| cSchema.release = {(data: UnsafeMutablePointer<ArrowC.ArrowSchema>?) in | ||
| let arraySchema = data!.pointee | ||
| let exportId = Int(bitPattern: arraySchema.private_data) | ||
| guard ArrowCExporter.exportedData[exportId] != nil else { | ||
| fatalError("Export schema not found with id \(exportId)") | ||
| } | ||
|
|
||
| // the data associated with this exportSchema object | ||
| // which includes the C strings for the format and name | ||
| // be deallocated upon removal | ||
| ArrowCExporter.exportedData.removeValue(forKey: exportId) | ||
| ArrowC.ArrowSwiftClearReleaseSchema(data) | ||
| } | ||
| } catch { | ||
| return .failure(.unknownError("\(error)")) | ||
| } | ||
| return .success(true) | ||
| } | ||
|
|
||
| public func exportField(_ schema: inout ArrowC.ArrowSchema, field: ArrowField) -> | ||
| Result<Bool, ArrowError> { | ||
| return exportType(&schema, arrowType: field.type, name: field.name) | ||
| } | ||
|
|
||
| public func exportArray(_ cArray: inout ArrowC.ArrowArray, arrowData: ArrowData) { | ||
| let exportArray = ExportArray(arrowData) | ||
| cArray.buffers = exportArray.buffers | ||
| cArray.length = Int64(arrowData.length) | ||
| cArray.null_count = Int64(arrowData.nullCount) | ||
| cArray.n_buffers = Int64(arrowData.buffers.count) | ||
| // Swift Arrow does not currently support children or dictionaries | ||
| // This will need to be updated once support has been added | ||
| cArray.n_children = 0 | ||
| cArray.children = nil | ||
| cArray.dictionary = nil | ||
| cArray.private_data = | ||
| UnsafeMutableRawPointer(mutating: UnsafeRawPointer(bitPattern: exportArray.id)) | ||
| cArray.release = {(data: UnsafeMutablePointer<ArrowC.ArrowArray>?) in | ||
| let arrayData = data!.pointee | ||
| let exportId = Int(bitPattern: arrayData.private_data) | ||
| guard ArrowCExporter.exportedData[exportId] != nil else { | ||
| fatalError("Export data not found with id \(exportId)") | ||
| } | ||
|
|
||
| // the data associated with this exportArray object | ||
| // which includes the entire arrowData object | ||
| // and the buffers UnsafeMutablePointer[] will | ||
| // be deallocated upon removal | ||
| ArrowCExporter.exportedData.removeValue(forKey: exportId) | ||
| ArrowC.ArrowSwiftClearReleaseArray(data) | ||
| } | ||
| } | ||
| } |
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