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If a var has optional type, e.g. ``` var x: Int? ``` It will be implicitly initialized to `nil`. However, there's a second, undocumented behavior: tuples of optional type, potentially nested infinitely, will also be initialized, to tuples of nil. So this var ``` var w: ((Int?, (), Int?), (Int?, Int?)) ``` Will be default-initialized to ``` ((nil, (), nil), (nil, nil)) ``` We need to handle this inside getDefaultValueStringRepresentation, otherwise we will crash while emitting partial modules. Fixes one instance of rdar://51560190
83 lines
4.7 KiB
Swift
83 lines
4.7 KiB
Swift
// RUN: %target-swift-emit-silgen -module-name implicit_property_initializers -Xllvm -sil-full-demangle -enable-testing %s | %FileCheck %s
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// CHECK: struct HasDefaultTupleOfNils {
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// CHECK: @_hasStorage @_hasInitialValue var x: (Int?, Int?)
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// CHECK: @_hasStorage @_hasInitialValue var y: Int?
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// CHECK: @_hasStorage var z: Int
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// CHECK: @_hasStorage @_hasInitialValue var w: ((Int?, (), Int?), (Int?, Int?))
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// CHECK: init(x: (Int?, Int?) = (nil, nil),
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// CHECK-SAME: y: Int? = nil,
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// CHECK-SAME: z: Int,
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// CHECK-SAME: w: ((Int?, (), Int?), (Int?, Int?)) = ((nil, (), nil), (nil, nil)))
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// CHECK: }
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struct HasDefaultTupleOfNils {
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var x: (Int?, Int?)
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var y: Int?
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var z: Int
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var w: ((Int?, (), Int?), (Int?, Int?))
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}
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// The default value initializer for 'x' should have type (Optional<Int>, Optional<Int>)
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// CHECK: sil [transparent] [ossa] @$[[X_VALUE_INIT:s30implicit_property_initializers21HasDefaultTupleOfNilsV1xSiSg_AEtvpfi]] : $@convention(thin) () -> (Optional<Int>, Optional<Int>) {
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// CHECK: bb0:
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// CHECK: %0 = enum $Optional<Int>, #Optional.none!enumelt
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// CHECK: %1 = enum $Optional<Int>, #Optional.none!enumelt
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// CHECK: %2 = tuple (%0 : $Optional<Int>, %1 : $Optional<Int>)
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// CHECK: return %2 : $(Optional<Int>, Optional<Int>)
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// CHECK: }
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// The default value initializer for 'y' should have type Optional<Int>
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//CHECK: sil [transparent] [ossa] @$s30implicit_property_initializers21HasDefaultTupleOfNilsV1ySiSgvpfi : $@convention(thin) () -> Optional<Int> {
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//CHECK: bb0:
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//CHECK: %0 = enum $Optional<Int>, #Optional.none!enumelt // user: %1
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//CHECK: return %0 : $Optional<Int> // id: %1
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//CHECK: }
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// There should not be a default value initializer for 'z'.
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// CHECK-NOT: @$s30implicit_property_initializers21HasDefaultTupleOfNilsV1zSivpfi
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// The default value initializer for 'w' should flatten to type (Optional<Int>, Optional<Int>, Optional<Int>, Optional<Int>)
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//CHECK: sil [transparent] [ossa] @$[[W_VALUE_INIT:s30implicit_property_initializers21HasDefaultTupleOfNilsV1wSiSg_ytAEt_AE_AEttvpfi]] : $@convention(thin) () -> (Optional<Int>, Optional<Int>, Optional<Int>, Optional<Int>) {
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//CHECK: bb0:
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//CHECK: %0 = enum $Optional<Int>, #Optional.none!enumelt // user: %4
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//CHECK: %1 = enum $Optional<Int>, #Optional.none!enumelt // user: %4
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//CHECK: %2 = enum $Optional<Int>, #Optional.none!enumelt // user: %4
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//CHECK: %3 = enum $Optional<Int>, #Optional.none!enumelt // user: %4
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//CHECK: %4 = tuple (%0 : $Optional<Int>, %1 : $Optional<Int>, %2 : $Optional<Int>, %3 : $Optional<Int>) // user: %5
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//CHECK: return %4 : $(Optional<Int>, Optional<Int>, Optional<Int>, Optional<Int>) // id: %5
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//CHECK: }
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// The default arg generator for 'x' inside the memberwise init should have type (Optional<Int>, Optional<Int>)
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// CHECK: sil [ossa] @$s30implicit_property_initializers21HasDefaultTupleOfNilsV1x1y1z1wACSiSg_AHt_AHSiAH_ytAHt_AH_AHtttcfcfA_ : $@convention(thin) () -> (Optional<Int>, Optional<Int>) {
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// CHECK: bb0:
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// CHECK: %0 = function_ref @$[[X_VALUE_INIT]] : $@convention(thin) () -> (Optional<Int>, Optional<Int>) // user: %1
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// CHECK: %1 = apply %0() : $@convention(thin) () -> (Optional<Int>, Optional<Int>)
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// CHECK: (%2, %3) = destructure_tuple %1 : $(Optional<Int>, Optional<Int>)
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// CHECK: %4 = tuple (%2 : $Optional<Int>, %3 : $Optional<Int>)
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// CHECK: return %4 : $(Optional<Int>, Optional<Int>)
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// CHECK: }
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// There should not be a default arg generator for 'y' because it's just a nil literal and clients construct it directly.
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// CHECK-NOT: @$s30implicit_property_initializers21HasDefaultTupleOfNilsV1x1y1z1wACSiSg_AHt_AHSiAH_ytAHt_AH_AHtttcfcfA0_
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// There should not be a default arg generator for 'z'
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// CHECK-NOT: @$s30implicit_property_initializers21HasDefaultTupleOfNilsV1x1y1z1wACSiSg_AHt_AHSiAH_ytAHt_AH_AHtttcfcfA1_
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// The default arg generator for 'w' should flatten to type (Optional<Int>, Optional<Int>, Optional<Int>, Optional<Int>)
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// CHECK: sil [ossa] @$s30implicit_property_initializers21HasDefaultTupleOfNilsV1x1y1z1wACSiSg_AHt_AHSiAH_ytAHt_AH_AHtttcfcfA2_ : $@convention(thin) () -> (Optional<Int>, Optional<Int>, Optional<Int>, Optional<Int>) {
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// CHECK: bb0:
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// CHECK: %0 = function_ref @$[[W_VALUE_INIT]] : $@convention(thin) () -> (Optional<Int>, Optional<Int>, Optional<Int>, Optional<Int>)
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// CHECK: %1 = apply %0() : $@convention(thin) () -> (Optional<Int>, Optional<Int>, Optional<Int>, Optional<Int>)
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// CHECK: (%2, %3, %4, %5) = destructure_tuple %1 : $(Optional<Int>, Optional<Int>, Optional<Int>, Optional<Int>)
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// CHECK: %6 = tuple (%2 : $Optional<Int>, %3 : $Optional<Int>, %4 : $Optional<Int>, %5 : $Optional<Int>)
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// CHECK: return %6 : $(Optional<Int>, Optional<Int>, Optional<Int>, Optional<Int>)
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// CHECK: }
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