Let indirect enum cases export spare bits

stdlib/public/RemoteInspection/TypeLowering.cpp

@@ -1984,12 +1984,21 @@ class EnumTypeInfoBuilder {
           // We don't have typeinfo; something is very broken.
           Invalid = true;
           return nullptr;
+	} else if (Case.Indirect) {
+	  // An indirect case is non-empty (it stores a pointer)
+	  // and acts like a non-generic (because the pointer has spare bits)
+	  ++NonGenericNonEmptyPayloadCases;
+          LastPayloadCaseTR = CaseTR;
         } else if (Case.Generic) {
+	  // Otherwise, we never consider spare bits from generic cases
           ++GenericPayloadCases;
           LastPayloadCaseTR = CaseTR;
         } else if (CaseTI->getSize() == 0) {
+	  // Needed to distinguish a "single-payload enum"
+	  // whose only case is empty.
           ++NonGenericEmptyPayloadCases;
         } else {
+	  // Finally, we consider spare bits from regular payloads
           ++NonGenericNonEmptyPayloadCases;
           LastPayloadCaseTR = CaseTR;
         }

validation-test/Reflection/reflect_Enum_values12.swift

@@ -0,0 +1,95 @@
+// RUN: %empty-directory(%t)
+// RUN: %target-build-swift -lswiftSwiftReflectionTest %s -o %t/reflect_Enum_values12
+// RUN: %target-codesign %t/reflect_Enum_values12
+
+// RUN: %target-run %target-swift-reflection-test %t/reflect_Enum_values12 | tee /dev/stderr | %FileCheck %s --check-prefix=CHECK%target-ptrsize --check-prefix=CHECKALL --dump-input=fail %add_num_extra_inhabitants
+
+// REQUIRES: objc_interop
+// REQUIRES: executable_test
+// REQUIRES: reflection_test_support
+// UNSUPPORTED: use_os_stdlib
+// UNSUPPORTED: asan
+
+import SwiftReflectionTest
+
+indirect enum Outer<T> {
+case a(T)
+case b(T)
+}
+
+class C {
+  var outer: Outer<Int>
+  init() { outer = .a(99) }
+}
+
+reflect(enumValue: Outer<Int>.a(12))
+
+// CHECKALL: Reflecting an enum value.
+// CHECKALL-NEXT: Type reference:
+// CHECKALL-NEXT: (bound_generic_enum reflect_Enum_values12.Outer
+// CHECKALL-NEXT:   (struct Swift.Int))
+// CHECKALL-NEXT: Value: .a(_)
+
+reflect(enumValue: Outer<Int>.b(7))
+
+// CHECKALL: Reflecting an enum value.
+// CHECKALL-NEXT: Type reference:
+// CHECKALL-NEXT: (bound_generic_enum reflect_Enum_values12.Outer
+// CHECKALL-NEXT:   (struct Swift.Int))
+// CHECKALL-NEXT: Value: .b(_)
+
+reflect(enumValue: Optional<Outer<Int>>.some(.a(12)))
+
+// CHECKALL: Reflecting an enum value.
+// CHECKALL-NEXT: Type reference:
+// CHECKALL-NEXT: (bound_generic_enum Swift.Optional
+// CHECKALL-NEXT:   (bound_generic_enum reflect_Enum_values12.Outer
+// CHECKALL-NEXT:     (struct Swift.Int)))
+// CHECKALL-NEXT: Value: .some(.a(_))
+
+reflect(enumValue: Optional<Outer<Int>>.some(.b(7)))
+
+// CHECKALL: Reflecting an enum value.
+// CHECKALL-NEXT: Type reference:
+// CHECKALL-NEXT: (bound_generic_enum Swift.Optional
+// CHECKALL-NEXT:   (bound_generic_enum reflect_Enum_values12.Outer
+// CHECKALL-NEXT:     (struct Swift.Int)))
+// CHECKALL-NEXT: Value: .some(.b(_))
+
+reflect(enumValue: Optional<Outer<Int>>.none)
+
+// CHECKALL: Reflecting an enum value.
+// CHECKALL-NEXT: Type reference:
+// CHECKALL-NEXT: (bound_generic_enum Swift.Optional
+// CHECKALL-NEXT:   (bound_generic_enum reflect_Enum_values12.Outer
+// CHECKALL-NEXT:     (struct Swift.Int)))
+// CHECKALL-NEXT: Value: .none
+
+reflect(object: C())
+
+// CHECKALL: Reflecting an object.
+// CHECKALL-NEXT: Instance pointer in child address space: 0x{{[0-9a-fA-F]+}}
+// CHECKALL-NEXT: Type reference:
+// CHECKALL-NEXT: (class reflect_Enum_values12.C)
+
+// CHECKALL: Type info:
+
+// CHECK64-NEXT: (class_instance size=24 alignment=8 stride=24 num_extra_inhabitants=0 bitwise_takable=1
+// CHECK64-NEXT:   (field name=outer offset=16
+// x86_64 and arm64 have different spare bit pointer masks, hence different numbers of extra inhabitants here
+// CHECK64-NEXT:     (multi_payload_enum size=8 alignment=8 stride=8 num_extra_inhabitants={{[0-9]+}} bitwise_takable=1
+
+// CHECK32-NEXT: (class_instance size=12 alignment=4 stride=12 num_extra_inhabitants=0 bitwise_takable=1
+// CHECK32-NEXT:   (field name=outer offset=8
+// CHECK32-NEXT:     (multi_payload_enum size=4 alignment=4 stride=4 num_extra_inhabitants=2 bitwise_takable=1
+
+// CHECKALL-NEXT:       (case name=a index=0 offset=0
+// CHECKALL-NEXT:         (reference kind=strong refcounting=native))
+// CHECKALL-NEXT:       (case name=b index=1 offset=0
+// CHECKALL-NEXT:         (reference kind=strong refcounting=native)))))
+
+
+doneReflecting()
+
+// CHECKALL: Done.
+