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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
29 lines
2.0 KiB
Swift
29 lines
2.0 KiB
Swift
// RUN: %target-swift-emit-silgen %s | %FileCheck %s
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// https://github.com/apple/swift/issues/63682
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// Test that we adjust to abstraction differences when assigning in generated
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// key path accessors.
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struct Foo<A> {
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var closure: () -> A?
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}
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// CHECK-LABEL: sil hidden [ossa] @{{.+}}physicalFunctionValue
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func physicalFunctionValue() {
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// CHECK: keypath $WritableKeyPath<Foo<Bool>, () -> Optional<Bool>>, (root $Foo<Bool>; settable_property $() -> Optional<Bool>, id ##Foo.closure, getter @$[[GETTER:[_a-zA-Z0-9]+]] {{.+}}, setter @$[[SETTER:[_a-zA-Z0-9]+]]
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let _ = \Foo<Bool>.closure
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} // CHECK: // end sil function '{{.+}}physicalFunctionValue
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// CHECK: sil shared [thunk] [ossa] @$[[GETTER]] : $@convention(keypath_accessor_getter) (@in_guaranteed Foo<Bool>) -> @out @callee_guaranteed @substituted <τ_0_0> () -> @out τ_0_0 for <Optional<Bool>> {
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// CHECK: bb0([[OUT_FN:%[0-9]+]] {{.+}}):
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// CHECK: [[SRC_REABSTR:%[0-9]+]] = convert_function %{{[0-9]+}} : $@callee_guaranteed () -> @out Optional<Bool> to $@callee_guaranteed @substituted <τ_0_0> () -> @out τ_0_0 for <Optional<Bool>>
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// CHECK-NEXT: store [[SRC_REABSTR]] to [init] [[OUT_FN]] : $*@callee_guaranteed @substituted <τ_0_0> () -> @out τ_0_0 for <Optional<Bool>>
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// CHECK: } // end sil function '$[[GETTER]]'
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// CHECK: sil shared [thunk] [ossa] @$[[SETTER]] : $@convention(keypath_accessor_setter) (@in_guaranteed @callee_guaranteed @substituted <τ_0_0> () -> @out τ_0_0 for <Optional<Bool>>, @inout Foo<Bool>) -> () {
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// CHECK: bb0({{.+}}, [[FOO:%[0-9]+]] : $*Foo<Bool>):
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// CHECK: [[SRC_REABSTR:%[0-9]+]] = convert_function %{{[0-9]+}} : $@callee_guaranteed () -> @out Optional<Bool> to $@callee_guaranteed @substituted <τ_0_0> () -> @out Optional<τ_0_0> for <Bool>
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// CHECK-NEXT: [[DEST:%[0-9]+]] = struct_element_addr [[FOO]] : $*Foo<Bool>, #Foo.closure
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// CHECK-NEXT: assign [[SRC_REABSTR]] to [[DEST]] : $*@callee_guaranteed @substituted <τ_0_0> () -> @out Optional<τ_0_0> for <Bool>
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// CHECK: } // end sil function '$[[SETTER]]'
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