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KeyPath's getter/setter/hash/equals functions have their own calling convention, which receives generic arguments and embedded indices from a given KeyPath argument buffer. The convention was previously implemented by: 1. Accepting an argument buffer as an UnsafeRawPointer and casting it to indices tuple pointer in SIL. 2. Bind generic arguments info from the given argument buffer while emitting prologue in IRGen by creating a new forwarding thunk. This 2-phase lowering approach was not ideal, as it blocked KeyPath projection optimization [^1], and also required having a target arch specific signature lowering logic in SIL-level [^2]. This patch centralizes the KeyPath accessor calling convention logic to IRGen, by introducing `@convention(keypath_accessor_XXX)` convention in SIL and lowering it in IRGen. This change unblocks the KeyPath projection optimization while capturing subscript indices, and also makes it easier to support WebAssembly target. [^1]: https://github.com/apple/swift/pull/28799 [^2]: https://forums.swift.org/t/wasm-support/16087/21
40 lines
1.3 KiB
C++
40 lines
1.3 KiB
C++
//===--- GenKeyPath.h - IR generation for KeyPath ---------------*- C++ -*-===//
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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 - 2017 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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//
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// This file provides the private interface to the emission of KeyPath
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_IRGEN_GENKEYPATH_H
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#define SWIFT_IRGEN_GENKEYPATH_H
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#include "GenericRequirement.h"
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#include "swift/AST/SubstitutionMap.h"
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#include "swift/Basic/LLVM.h"
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#include "swift/SIL/SILValue.h"
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#include "llvm/IR/Value.h"
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namespace swift {
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namespace irgen {
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class Explosion;
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class IRGenFunction;
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class StackAddress;
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std::pair<llvm::Value *, llvm::Value *> emitKeyPathArgument(
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IRGenFunction &IGF, SubstitutionMap subs, const CanGenericSignature &sig,
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ArrayRef<SILType> indiceTypes, Explosion &indiceValues,
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llvm::Optional<StackAddress> &dynamicArgsBuf);
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} // end namespace irgen
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} // end namespace swift
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#endif
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