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20a8f450dd
While I was using the new AccessUtils for a new optimization pass I discovered some areas for improvements. Also I found some bugs. Changes: * AccessBase: remove the unhealthy redundancy between `kind` and `baseAddress` types. Now AccessBase is single enum with the relevant base objects/addresses as payloads. * AccessBase: for `global`, store the `GlobalValue` and not a `global_address` instruction, which is more accurate (because there can be multiple `global_addr`s for a single global variable) * AccessBase: drop the support for function argument "pointers". The `pointer` is now always a `pointer_to_address` instruction. This also simplifies `PointerIdentification`: either it finds a matching `address_to_pointer` or it bails. * AccessBase: improve `func isDistinct(from:)`. There are more possibilities to prove that two access bases do not alias. * AccessBase: replace `var isUniquelyIdentified` with `var hasKnownStorageKind` which is more useful for aliasing checking. * AccessPath: fix `func isDistinct(from:)`. `SmallProjectionPath.matches` is the wrong way to check if two expression paths may overlap. Instead use the new `SmallProjectionPath.mayOverlap`. * AccessStoragePathWalker: rename `getAccessStorage` -> `visitAccessStorageRoots` and let it return false if it's not a class/reference AccessBase. * add tests for `AccessPath.isDistinct(from:)`
48 lines
1.4 KiB
Swift
48 lines
1.4 KiB
Swift
//===--- GlobalVariable.swift - Defines the GlobalVariable class ----------===//
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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 - 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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import Basic
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import SILBridging
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final public class GlobalVariable : CustomStringConvertible, HasShortDescription, Hashable {
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public var name: StringRef {
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return StringRef(bridged: SILGlobalVariable_getName(bridged))
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}
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public var description: String {
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let stdString = SILGlobalVariable_debugDescription(bridged)
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return String(_cxxString: stdString)
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}
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public var shortDescription: String { name.string }
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public var isLet: Bool { SILGlobalVariable_isLet(bridged) != 0 }
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// TODO: initializer instructions
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public static func ==(lhs: GlobalVariable, rhs: GlobalVariable) -> Bool {
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lhs === rhs
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}
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public func hash(into hasher: inout Hasher) {
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hasher.combine(ObjectIdentifier(self))
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}
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var bridged: BridgedGlobalVar { BridgedGlobalVar(obj: SwiftObject(self)) }
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}
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// Bridging utilities
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extension BridgedGlobalVar {
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var globalVar: GlobalVariable { obj.getAs(GlobalVariable.self) }
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}
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