[Test] Add a SILGen test to make sure the observers are correctly called

Author: theblixguy

test/SILGen/property_wrapper_observers.swift

@@ -0,0 +1,71 @@
+// RUN: %target-swift-emit-silgen %s | %FileCheck %s
+
+// 1. Make sure the wrapped property setter calls the observers
+// 2. Make sure the synthesized _modify coroutine calls the wrapped property setter
+
+@propertyWrapper 
+struct Foo {
+  private var _storage: [Int] = []
+
+  init(wrappedValue value: [Int]) {
+    self._storage = value
+  }
+
+  var wrappedValue: [Int] {
+    get { _storage }
+    set { _storage = newValue }
+  }
+}
+
+class Bar {
+  @Foo var someArray = [1, 2, 3] {
+    willSet {}
+    didSet {}
+  }
+}
+
+// Bar.someArray.setter
+
+// CHECK-LABEL: sil hidden [ossa] @$s26property_wrapper_observers3BarC9someArraySaySiGvs : $@convention(method) (@owned Array<Int>, @guaranteed Bar) -> () {
+// CHECK: bb0([[VALUE:%.*]] : @owned $Array<Int>, [[BAR:%.*]] : @guaranteed $Bar):
+
+// CHECK: [[WILLSET:%.*]] = function_ref @$s26property_wrapper_observers3BarC9someArraySaySiGvw : $@convention(method) (@guaranteed Array<Int>, @guaranteed Bar) -> ()
+// CHECK-NEXT: [[RESULT_WS:%.*]] = apply [[WILLSET]](%{{[0-9]+}}, [[BAR]]) : $@convention(method) (@guaranteed Array<Int>, @guaranteed Bar) -> ()
+
+// CHECK: [[WRAPPED_VALUE_SETTER:%.*]] = function_ref @$s26property_wrapper_observers3FooV12wrappedValueSaySiGvs : $@convention(method) (@owned Array<Int>, @inout Foo) -> ()
+// CHECK-NEXT: [[RESULT_WVS:%.*]] = apply [[WRAPPED_VALUE_SETTER]](%{{[0-9]+}}, %{{[0-9]+}}) : $@convention(method) (@owned Array<Int>, @inout Foo) -> ()
+
+// CHECK: [[DIDSET:%.*]] = function_ref @$s26property_wrapper_observers3BarC9someArraySaySiGvW : $@convention(method) (@guaranteed Bar) -> ()
+// CHECK-NEXT: [[RESULT_DS:%.*]] = apply [[DIDSET]]([[BAR]]) : $@convention(method) (@guaranteed Bar) -> ()
+// CHECK: }
+
+// Bar.someArray.modify
+
+// CHECK-LABEL: sil hidden [ossa] @$s26property_wrapper_observers3BarC9someArraySaySiGvM : $@yield_once @convention(method) (@guaranteed Bar) -> @yields @inout Array<Int> {
+// CHECK: bb0([[BAR:%.*]] : @guaranteed $Bar):
+// CHECK-NEXT: debug_value [[BAR]] : $Bar, let, name "self", argno 1
+// CHECK-NEXT: [[ALLOC_STACK:%.*]] = alloc_stack $Array<Int>
+// CHECK-NEXT:  // function_ref Bar.someArray.getter
+// CHECK-NEXT: [[GETTER:%.*]] = function_ref @$s26property_wrapper_observers3BarC9someArraySaySiGvg : $@convention(method) (@guaranteed Bar) -> @owned Array<Int>
+// CHECK-NEXT:  [[RESULT:%.*]] = apply [[GETTER]]([[BAR]]) : $@convention(method) (@guaranteed Bar) -> @owned Array<Int>
+// CHECK-NEXT:  store [[RESULT]] to [init] [[ALLOC_STACK]] : $*Array<Int>
+// CHECK-NEXT:  yield [[ALLOC_STACK]] : $*Array<Int>, resume bb1, unwind bb2
+
+// CHECK: bb1:
+// CHECK-NEXT:  [[VALUE:%.*]] = load [take] [[ALLOC_STACK]] : $*Array<Int>
+// CHECK-NEXT:  // function_ref Bar.someArray.setter
+// CHECK-NEXT:  [[SETTER:%.*]] = function_ref @$s26property_wrapper_observers3BarC9someArraySaySiGvs : $@convention(method) (@owned Array<Int>, @guaranteed Bar) -> ()
+// CHECK-NEXT:  [[RESULT:%.*]] = apply [[SETTER]]([[VALUE]], [[BAR]]) : $@convention(method) (@owned Array<Int>, @guaranteed Bar) -> ()
+// CHECK-NEXT:  dealloc_stack [[ALLOC_STACK]] : $*Array<Int>
+// CHECK-NEXT:  [[TUPLE:%.*]] = tuple ()
+// CHECK-NEXT:  return [[TUPLE]] : $()
+
+// CHECK: bb2:
+// CHECK-NEXT:  [[NEWVALUE:%.*]] = load [copy] [[ALLOC_STACK]] : $*Array<Int>
+// CHECK-NEXT:  // function_ref Bar.someArray.setter
+// CHECK-NEXT:  [[SETTER:%.*]] = function_ref @$s26property_wrapper_observers3BarC9someArraySaySiGvs : $@convention(method) (@owned Array<Int>, @guaranteed Bar) -> ()
+// CHECK-NEXT:  [[RESULT:%.*]] = apply [[SETTER]]([[NEWVALUE]], [[BAR]]) : $@convention(method) (@owned Array<Int>, @guaranteed Bar) -> ()
+// CHECK-NEXT:  destroy_addr [[ALLOC_STACK]] : $*Array<Int>
+// CHECK-NEXT:  dealloc_stack [[ALLOC_STACK]] : $*Array<Int>
+// CHECK-NEXT:  unwind
+// CHECK-END: }