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eff9c61a14
compiler bug -- all I changed is inlined the _withUninitializedString function into the caller Swift SVN r20942
112 lines
3.9 KiB
Swift
112 lines
3.9 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) 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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// Extern C functions
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//===----------------------------------------------------------------------===//
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// FIXME: Once we have an FFI interface, make these have proper function bodies
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@asmname("putchar")
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func _putchar(value: Int32) -> Int32
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@transparent public func _countLeadingZeros(value: Int64) -> Int64 {
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return Int64(Builtin.int_ctlz_Int64(value.value, false.value))
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}
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@transparent public func _autorelease(x: AnyObject) {
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Builtin.retain(x)
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Builtin.autorelease(x)
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}
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/// Invoke `body` with an allocated, but uninitialized memory suitable for a
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/// `String` value.
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///
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/// This function is primarily useful to call various runtime functions
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/// written in C++.
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func _withUninitializedString<R>(
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body: (UnsafeMutablePointer<String>) -> R
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) -> (R, String) {
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var stringPtr = UnsafeMutablePointer<String>.alloc(1)
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let bodyResult = body(stringPtr)
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let stringResult = stringPtr.move()
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stringPtr.dealloc(1)
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return (bodyResult, stringResult)
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}
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/// Check if a given object (of value or reference type) conforms to the given
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/// protocol.
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///
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/// Limitation: `DestType` should be a protocol defined in the `Swift` module.
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@asmname("swift_stdlib_conformsToProtocol")
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public func _stdlib_conformsToProtocol<SourceType, DestType>(
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value: SourceType, _: DestType.Type
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) -> Bool
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/// Cast the given object (of value or reference type) to the given protocol
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/// type. Traps if the object does not conform to the protocol.
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///
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/// Limitation: `DestType` should be a protocol defined in the `Swift` module.
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@asmname("swift_stdlib_dynamicCastToExistential1Unconditional")
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public func _stdlib_dynamicCastToExistential1Unconditional<
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SourceType, DestType
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>(
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value: SourceType, _: DestType.Type
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) -> DestType
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/// Cast the given object (of value or reference type) to the given protocol
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/// type. Returns `.None` if the object does not conform to the protocol.
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///
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/// Limitation: `DestType` should be a protocol defined in the `Swift` module.
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@asmname("swift_stdlib_dynamicCastToExistential1")
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public func _stdlib_dynamicCastToExistential1<SourceType, DestType>(
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value: SourceType, _: DestType.Type
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) -> DestType?
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@asmname("swift_stdlib_getTypeName")
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func _stdlib_getTypeNameImpl<T>(value: T, result: UnsafeMutablePointer<String>)
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/// Returns the mangled type name for the given value.
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public func _stdlib_getTypeName<T>(value: T) -> String {
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// FIXME: this code should be using _withUninitializedString, but it leaks
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// when called from here.
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// <rdar://problem/17892969> Closures in generic context leak their captures?
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var stringPtr = UnsafeMutablePointer<String>.alloc(1)
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_stdlib_getTypeNameImpl(value, stringPtr)
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let stringResult = stringPtr.move()
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stringPtr.dealloc(1)
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return stringResult
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}
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/// Returns the human-readable type name for the given value.
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public func _stdlib_getDemangledTypeName<T>(value: T) -> String {
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return _stdlib_demangleName(_stdlib_getTypeName(value))
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}
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@asmname("swift_stdlib_demangleName")
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func _stdlib_demangleNameImpl(
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mangledName: UnsafePointer<UInt8>,
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mangledNameLength: UWord,
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demangledName: UnsafeMutablePointer<String>)
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public func _stdlib_demangleName(mangledName: String) -> String {
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var mangledNameUTF8 = Array(mangledName.utf8)
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return mangledNameUTF8.withUnsafeBufferPointer {
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(mangledNameUTF8) in
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let (_, demangledName) = _withUninitializedString {
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_stdlib_demangleNameImpl(
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mangledNameUTF8.baseAddress, UWord(mangledNameUTF8.endIndex),
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$0)
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}
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return demangledName
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}
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}
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