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5bc036661c
It lowers let property accesses of classes.
Lowering consists of two tasks:
* In class initializers, insert `end_init_let_ref` instructions at places where all let-fields are initialized.
This strictly separates the life-range of the class into a region where let fields are still written during
initialization and a region where let fields are truly immutable.
* Add the `[immutable]` flag to all `ref_element_addr` instructions (for let-fields) which are in the "immutable"
region. This includes the region after an inserted `end_init_let_ref` in an class initializer, but also all
let-field accesses in other functions than the initializer and the destructor.
This pass should run after DefiniteInitialization but before RawSILInstLowering (because it relies on `mark_uninitialized` still present in the class initializer).
Note that it's not mandatory to run this pass. If it doesn't run, SIL is still correct.
Simplified example (after lowering):
bb0(%0 : @owned C): // = self of the class initializer
%1 = mark_uninitialized %0
%2 = ref_element_addr %1, #C.l // a let-field
store %init_value to %2
%3 = end_init_let_ref %1 // inserted by lowering
%4 = ref_element_addr [immutable] %3, #C.l // set to immutable by lowering
%5 = load %4
34 lines
2.1 KiB
Swift
34 lines
2.1 KiB
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend-emit-module -emit-module-path %t/FakeDistributedActorSystems.swiftmodule -module-name FakeDistributedActorSystems -disable-availability-checking %S/../Inputs/FakeDistributedActorSystems.swift
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// RUN: %target-swift-frontend -module-name default_deinit -primary-file %s -emit-sil -verify -disable-availability-checking -I %t | %FileCheck %s --enable-var-scope --dump-input=fail
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// REQUIRES: concurrency
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// REQUIRES: distributed
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// REQUIRES: swift_in_compiler
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/// The convention in this test is that the Swift declaration comes before its FileCheck lines.
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import Distributed
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import FakeDistributedActorSystems
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typealias DefaultDistributedActorSystem = FakeRoundtripActorSystem
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// ==== ----------------------------------------------------------------------------------------------------------------
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distributed actor MyDistActor {
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// protocol witness for DistributedActorSystem.resolve<A>(id:as:) in conformance FakeRoundtripActorSystem
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// CHECK: sil hidden @$s14default_deinit11MyDistActorC7resolve2id5usingAC015FakeDistributedE7Systems0E7AddressV_AG0i9RoundtripE6SystemCtKFZ
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// CHECK: bb0([[ACTOR_ID_ARG:%[0-9]+]] : $ActorAddress, [[SYSTEM_ARG:%[0-9]+]] : $FakeRoundtripActorSystem, [[TYPE_ARG:%[0-9]+]] : $@thick MyDistActor.Type):
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// CHECK: [[SYS_RESOLVE_RESULT:%[0-9]+]] = function_ref @$s27FakeDistributedActorSystems0a9RoundtripC6SystemC7resolve2id2asxSgAA0C7AddressV_xmtK0B00bC0RzlF
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// CHECK: [[ACTOR_INSTANCE:%[0-9]+]] = builtin "initializeDistributedRemoteActor"(%7 : $@thick MyDistActor.Type) : $MyDistActor
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// CHECK: [[ID_PROPERTY:%[0-9]+]] = ref_element_addr [immutable] [[ACTOR_INSTANCE]] : $MyDistActor, #MyDistActor.id
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// CHECK: retain_value [[ACTOR_ID_ARG]] : $ActorAddress
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// CHECK: store [[ACTOR_ID_ARG]] to [[ID_PROPERTY]] : $*ActorAddress
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// CHECK: [[SYSTEM_PROPERTY:%[0-9]+]] = ref_element_addr [immutable] [[ACTOR_INSTANCE]] : $MyDistActor, #MyDistActor.actorSystem
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// CHECK: strong_retain [[SYSTEM_ARG]] : $FakeRoundtripActorSystem
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// CHECK: store [[SYSTEM_ARG]] to [[SYSTEM_PROPERTY]] : $*FakeRoundtripActorSystem
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// CHECK: br bb5([[ACTOR_INSTANCE]] : $MyDistActor)
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}
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