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c7a5569c4f
This makes ManagedBuffer available and usable in Embedded Swift, by: - Removing an internal consistency check from ManagedBuffer that relies on metatypes. - Making the .create() API transparent (to hoist the metatype to the callee). - Adding a AllocRefDynamicInst simplification to convert `alloc_ref_dynamic` to `alloc_ref`, which removes a metatype use. - Adding tests for the above.
46 lines
1.9 KiB
Swift
46 lines
1.9 KiB
Swift
//===--- SimplifyAllocRefDynamic.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 - 2023 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 SIL
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extension AllocRefDynamicInst : OnoneSimplifyable {
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func simplify(_ context: SimplifyContext) {
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/// Optimize alloc_ref_dynamic of a known type to alloc_ref:
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///
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/// %3 = metatype SubClass.Type
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/// %4 = upcast %3 : SubClass.Type to BaseClass.Type
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/// %6 = alloc_ref_dynamic [...] %4 : BaseClass.Type, $BaseClass
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/// %8 = (... some use of ...) %6 : $BaseClass
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/// ->
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/// %6 = alloc_ref [...] $SubClass
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/// %7 = upcast %6 : $SubClass to $BaseClass
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/// %8 = (... some use of ...) %7 : $BaseClass
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let type: Type
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if let metatypeInst = operands[1].value as? MetatypeInst {
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type = metatypeInst.type.loweredInstanceTypeOfMetatype(in: parentFunction)
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} else if let upcastInst = operands[1].value as? UpcastInst,
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let metatypeInst = upcastInst.operands[0].value as? MetatypeInst {
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type = metatypeInst.type.loweredInstanceTypeOfMetatype(in: parentFunction)
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} else {
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return
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}
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let builder = Builder(before: self, context)
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let newAlloc = builder.createAllocRef(type, isObjC: self.isObjC, canAllocOnStack: self.canAllocOnStack, isBare: false,
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tailAllocatedTypes: self.tailAllocatedTypes, tailAllocatedCounts: Array(self.tailAllocatedCounts.values))
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let newCast = builder.createUpcast(from: newAlloc, to: self.type)
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uses.replaceAll(with: newCast, context)
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context.erase(instruction: self)
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}
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}
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