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fa2d467fc0
This ensures that a `borrow` accessor doesn't introduce temporary bitwise copies of the representation that could foreshorten the lifetime of memory-dependent references.
71 lines
2.4 KiB
Swift
71 lines
2.4 KiB
Swift
// RUN: %target-swift-emit-silgen -enable-experimental-feature BorrowAndMutateAccessors -enable-experimental-feature AddressableTypes %s
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// REQUIRES: swift_feature_BorrowAndMutateAccessors
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// REQUIRES: swift_feature_AddressableTypes
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// When the `self` and/or result type of a borrow accessor is addressable-for-
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// dependencies, the corresponding parameter and/or result is indirect.
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@_addressableForDependencies
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struct AFD { var x: Int }
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struct DirectContainer {
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let _value: AFD
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let _nonAFDValue: AnyObject
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// `self` and `result` are both AFD
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// CHECK-LABEL: sil{{.*}} @$s{{.*}}15DirectContainerV5value{{.*}}vb :
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// CHECK: bb0([[SELF:%.*]] : $*DirectContainer):
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// CHECK: [[FIELD_ADDR:%.*]] = struct_element_addr [[SELF]]
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// CHECK: return [[FIELD_ADDR]]
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var value: AFD {
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borrow { return _value }
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}
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// `self` is AFD, but `result` is not
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// CHECK-LABEL: sil{{.*}} @$s{{.*}}15DirectContainerV11nonAFDValue{{.*}}vb :
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// CHECK: bb0([[SELF:%.*]] : $*DirectContainer):
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// CHECK: [[FIELD_ADDR:%.*]] = struct_element_addr [[SELF]]
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// CHECK: [[FIELD:%.*]] = load_borrow [[FIELD_ADDR]]
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// CHECK: [[FIELD_UNCHECKED:%.*]] = unchecked_ownership [[FIELD]]
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// CHECK: return [[FIELD_UNCHECKED]]
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var nonAFDValue: AnyObject {
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borrow { return _nonAFDValue }
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}
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}
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class Box {
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let _value: AFD
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let _nonAFDValue: AnyObject
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init() {}
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}
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struct IndirectContainer {
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let box: Box
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// `self` is non-AFD, but `result` is
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// CHECK-LABEL: sil{{.*}} @$s{{.*}}17IndirectContainerV5value{{.*}}vb :
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// CHECK: bb0([[SELF:%.*]] : @guaranteed $IndirectContainer):
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// CHECK: [[BOX:%.*]] = struct_extract [[SELF]]
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// CHECK: [[FIELD_ADDR:%.*]] = ref_element_addr [[BOX]]
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// CHECK: return [[FIELD_ADDR]]
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var value: AFD {
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borrow { return box._value }
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}
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// neither `self` nor `result` is AFD
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// CHECK-LABEL: sil{{.*}} @$s{{.*}}17IndirectContainerV11nonAFDValue{{.*}}vb :
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// CHECK: bb0([[SELF:%.*]] : @guaranteed $IndirectContainer):
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// CHECK: [[BOX:%.*]] = struct_extract [[SELF]]
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// CHECK: [[FIELD_ADDR:%.*]] = ref_element_addr [[BOX]]
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// CHECK: [[FIELD:%.*]] = load_borrow [[FIELD_ADDR]]
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// CHECK: [[FIELD_UNCHECKED:%.*]] = unchecked_ownership [[FIELD]]
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// CHECK: return [[FIELD_UNCHECKED]]
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var nonAFDValue: AnyObject {
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borrow { return box._nonAFDValue }
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}
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}
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