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https://github.com/apple/swift.git
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112 lines
2.6 KiB
Swift
112 lines
2.6 KiB
Swift
//===----------------------------------------------------------------------===//
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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) 2021 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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public func emitCollection<C: Collection>(
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_ collection: C,
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name: String,
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type: String,
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into result: inout String,
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formatter: (C.Element) -> String
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) {
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result += """
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static const \(type) \(name)[\(collection.count)] = {
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"""
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formatCollection(collection, into: &result, using: formatter)
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result += "\n};\n\n"
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}
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public func emitCollection<C: Collection>(
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_ collection: C,
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name: String,
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into result: inout String
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) where C.Element: FixedWidthInteger {
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emitCollection(
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collection,
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name: name,
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type: "__swift_\(C.Element.isSigned ? "" : "u")int\(C.Element.bitWidth)_t",
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into: &result
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) {
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"0x\(String($0, radix: 16, uppercase: true))"
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}
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}
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// Emits an abstract minimal perfect hash function into C arrays.
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public func emitMph(
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_ mph: Mph,
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name: String,
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defineLabel: String,
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into result: inout String
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) {
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result += """
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#define \(defineLabel)_LEVEL_COUNT \(mph.bitArrays.count)
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"""
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emitMphSizes(mph, name, into: &result)
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emitMphBitarrays(mph, name, into: &result)
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emitMphRanks(mph, name, into: &result)
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}
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// BitArray sizes
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func emitMphSizes(_ mph: Mph, _ name: String, into result: inout String) {
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emitCollection(
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mph.bitArrays,
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name: "\(name)_sizes",
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type: "__swift_uint16_t",
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into: &result
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) {
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"0x\(String($0.size, radix: 16, uppercase: true))"
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}
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}
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func emitMphBitarrays(_ mph: Mph, _ name: String, into result: inout String) {
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// Individual bitarrays
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for (i, ba) in mph.bitArrays.enumerated() {
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emitCollection(ba.words, name: "\(name)_keys\(i)", into: &result)
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}
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// Overall bitarrays
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emitCollection(
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mph.bitArrays.indices,
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name: "\(name)_keys",
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type: "__swift_uint64_t * const",
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into: &result
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) {
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"\(name)_keys\($0)"
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}
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}
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func emitMphRanks(_ mph: Mph, _ name: String, into result: inout String) {
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// Individual ranks
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for (i, rank) in mph.ranks.enumerated() {
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emitCollection(rank, name: "\(name)_ranks\(i)", into: &result)
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}
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// Overall ranks
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emitCollection(
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mph.ranks.indices,
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name: "\(name)_ranks",
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type: "__swift_uint16_t * const",
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into: &result
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) {
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"\(name)_ranks\($0)"
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}
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}
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