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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 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
//
//===----------------------------------------------------------------------===//
/// Enum capturing all of the functions that can be used in an `#if` condition.
enum IfConfigFunctions: String {
/// A check for a specific attribute via `hasAttribute(<name>)`.
case hasAttribute
/// A check for a specific named feature via `hasFeature(<name>)`.
case hasFeature
/// A check for the Swift language version via `swift(>=version).`
case swift
/// A check for the Swift compiler version via `compiler(>=version)`.
case compiler
/// A check to determine whether a given module can be imported via `canImport(<import path>)`.
case canImport
/// A check for the target Operating System kind (e.g., Linux, iOS) via `os(<name>)`
case os
/// A check for the target architecture (e.g., arm64, x86_64) via `arch(<name>)`.
case arch
/// A check for the target environment (e.g., simulator) via `targetEnvironment(<environment>)`.
case targetEnvironment
/// A check to determine whether the platform supports atomic operations
/// with the given bitwidth, e.g., `_hasAtomicBitWidth(_64)`.
case _hasAtomicBitWidth
/// A historical check against a specific compiler build version via `_compiler_version("<version>")`.
case _compiler_version
/// A check for the target endianness (e.g., big or little) via `_endian(big|little)`.
case _endian
/// A check for the target bit width of a pointer (e.g., _64)
case _pointerBitWidth
/// A check for the target runtime paired with the Swift runtime (e.g., _ObjC)
/// via `_runtime(<name>)`.
case _runtime
/// A check for the target's pointer authentication scheme (e.g., _arm64e)
/// via `_ptrauth(<name>)`.
case _ptrauth
/// An unsupported function used by C preprocessor macros (e.g. `#if defined(FOO)`)
case defined
/// Whether uses of this function consitutes a check that guards new syntax.
/// When such a check fails, the compiler should not diagnose syntax errors
/// within the covered block.
var syntaxErrorsAllowed: Bool {
switch self {
case .swift, .compiler, ._compiler_version:
return true
case .hasAttribute, .hasFeature, .canImport, .os, .arch, .targetEnvironment,
._hasAtomicBitWidth, ._endian, ._pointerBitWidth, ._runtime, ._ptrauth, .defined:
return false
}
}
}
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