Merge pull request swiftlang#77197 from drexin/wip-138085348

[Runtime] Fix SwiftError handling in CVW runtime

Author: drexin

stdlib/public/runtime/BytecodeLayouts.cpp

@@ -249,8 +249,6 @@ static void handleEnd(const Metadata *metadata,
 static void errorDestroy(const Metadata *metadata, LayoutStringReader1 &reader,
                          uintptr_t &addrOffset, uint8_t *addr) {
   uintptr_t object = *(uintptr_t *)(addr + addrOffset);
-  if (object & _swift_abi_ObjCReservedBitsMask)
-    return;
   object &= ~_swift_abi_SwiftSpareBitsMask;
   addrOffset += sizeof(SwiftError*);
   swift_errorRelease((SwiftError *)object);
@@ -911,8 +909,6 @@ static void errorRetain(const Metadata *metadata, LayoutStringReader1 &reader,
                         uintptr_t &addrOffset, uint8_t *dest, uint8_t *src) {
   uintptr_t _addrOffset = addrOffset;
   uintptr_t object = *(uintptr_t *)(src + _addrOffset);
-  if (object & _swift_abi_ObjCReservedBitsMask)
-    return;
   memcpy(dest + addrOffset, &object, sizeof(SwiftError*));
   object &= ~_swift_abi_SwiftSpareBitsMask;
   addrOffset = _addrOffset + sizeof(SwiftError *);
@@ -1306,15 +1302,10 @@ static void errorAssignWithCopy(const Metadata *metadata,
   memcpy(dest + _addrOffset, &srcObject, sizeof(SwiftError *));
   addrOffset = _addrOffset + sizeof(SwiftError *);
 
-  if (!(destObject & _swift_abi_ObjCReservedBitsMask)) {
-    destObject &= ~_swift_abi_SwiftSpareBitsMask;
-    swift_errorRelease((SwiftError *)destObject);
-  }
-
-  if (!(srcObject & _swift_abi_ObjCReservedBitsMask)) {
-    srcObject &= ~_swift_abi_SwiftSpareBitsMask;
-    swift_errorRetain((SwiftError *)srcObject);
-  }
+  destObject &= ~_swift_abi_SwiftSpareBitsMask;
+  srcObject &= ~_swift_abi_SwiftSpareBitsMask;
+  swift_errorRelease((SwiftError *)destObject);
+  swift_errorRetain((SwiftError *)srcObject);
 }
 
 static void nativeStrongAssignWithCopy(const Metadata *metadata,

test/Interpreter/Inputs/layout_string_witnesses_types.swift

@@ -617,6 +617,7 @@ public enum MultiPayloadError {
     case empty
     case error1(Int, Error)
     case error2(Int, Error)
+    case error3(Int, Error)
 }
 
 public enum TwoPayloadInner {
@@ -661,6 +662,11 @@ public enum OneExtraTagValue {
     case z
 }
 
+public enum ErrorWrapper {
+    case x(Error)
+    case y(Error)
+}
+
 @inline(never)
 public func consume<T>(_ x: T.Type) {
     withExtendedLifetime(x) {}

test/Interpreter/layout_string_witnesses_static.swift

@@ -1175,6 +1175,19 @@ func testMultiPayloadError() {
     // CHECK-NEXT: SimpleClass deinitialized!
     testDestroy(ptr)
 
+    // initWithCopy
+    do {
+        let x = MultiPayloadError.error3(0, MyError(x: SimpleClass(x: 23)))
+        testInit(ptr, to: x)
+    }
+
+    // CHECK-NEXT: Before deinit
+    print("Before deinit")
+
+    // destroy
+    // CHECK-NEXT: SimpleClass deinitialized!
+    testDestroy(ptr)
+
     ptr.deallocate()
 }
 
@@ -1194,6 +1207,7 @@ func testMultiPayloadErrorKeepsTagIntact() {
     switch ptr.pointee {
         case .error1: print("Get error1!")
         case .error2: print("Got error2!")
+        case .error3: print("Got error3!")
         case .empty: print("Got empty!")
     }