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Tests: Add reproducer for Swift 6.3 typed-throws async closure miscompile
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‎Tests/BridgeJSRuntimeTests/TypedThrowsAsyncClosureBugTests.swift‎

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import XCTest
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import JavaScriptKit
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import JavaScriptEventLoop
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/// Reproducer for swiftlang/swift#89320 (fix in flight: swiftlang/swift#89715):
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/// on wasm32, a typed error thrown from a CAPTURELESS async closure value or
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/// function reference (lowered via `thin_to_thick_function`) is lost across the
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/// async unwind when the error type is too large for the direct error convention.
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/// Capturing closures, direct async function calls, and small error payloads are
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/// unaffected. The bug cases below assert the current (incorrect) behavior so the
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/// suite stays green; flip them once swiftlang/swift#89715 lands.
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// MARK: - Payload types
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struct PlainValuePayloadError: Error, Equatable {
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let marker: String
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}
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/// Intentionally limited to trivially-copyable fields: the corrupted error produced by
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/// swiftlang/swift#89320 is unsafe to read through String or class-reference payloads.
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struct LargePayloadError: Error, Equatable {
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let first: UInt64
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let second: UInt64
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let third: UInt64
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let marker: UInt64
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}
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final class MarkerBox: @unchecked Sendable {
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let marker: String
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init(_ marker: String) { self.marker = marker }
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}
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struct ReferencePayloadError: Error {
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let box: MarkerBox
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}
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// MARK: - Control "async function" forms (payload must survive)
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private func asyncFunctionThrowsValue() async throws(PlainValuePayloadError) {
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throw PlainValuePayloadError(marker: "ALIVE")
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}
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private func asyncFunctionThrowsReference() async throws(ReferencePayloadError) {
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throw ReferencePayloadError(box: MarkerBox("ALIVE"))
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}
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private func asyncFunctionThrowsJSException() async throws(JSException) {
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throw JSException(JSError(message: "ALIVE").jsValue)
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}
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@inline(never)
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private func largePayloadAfterThrow(
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_ closure: () async throws(LargePayloadError) -> Void
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) async -> LargePayloadError? {
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do {
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try await closure()
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return nil
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} catch {
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return error
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}
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}
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final class TypedThrowsAsyncClosureBugTests: XCTestCase {
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func testControl_valuePayload_asyncFunction() async throws {
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do {
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try await asyncFunctionThrowsValue()
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XCTFail("expected throw")
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} catch let error as PlainValuePayloadError {
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print("[REPRO] value / async function payload: \(error.marker)")
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XCTAssertEqual(error.marker, "ALIVE")
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}
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}
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func testControl_valuePayload_typedThrowsAsyncClosure() async throws {
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let closure: () async throws(PlainValuePayloadError) -> Void = {
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() async throws(PlainValuePayloadError) -> Void in
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throw PlainValuePayloadError(marker: "ALIVE")
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}
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do {
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try await closure()
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XCTFail("expected throw")
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} catch let error as PlainValuePayloadError {
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print("[REPRO] value / typed-throws async closure payload: \(error.marker)")
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XCTAssertEqual(error.marker, "ALIVE")
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}
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}
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func testControl_valuePayload_untypedAsyncClosure() async throws {
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let closure: () async throws -> Void = {
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throw PlainValuePayloadError(marker: "ALIVE")
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}
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do {
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try await closure()
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XCTFail("expected throw")
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} catch let error as PlainValuePayloadError {
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print("[REPRO] value / untyped async closure payload: \(error.marker)")
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XCTAssertEqual(error.marker, "ALIVE")
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}
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}
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func testControl_referencePayload_asyncFunction() async throws {
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do {
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try await asyncFunctionThrowsReference()
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XCTFail("expected throw")
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} catch let error as ReferencePayloadError {
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print("[REPRO] ref / async function payload: \(error.box.marker)")
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XCTAssertEqual(error.box.marker, "ALIVE")
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}
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}
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func testControl_referencePayload_typedThrowsAsyncClosure() async throws {
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let closure: () async throws(ReferencePayloadError) -> Void = {
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() async throws(ReferencePayloadError) -> Void in
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throw ReferencePayloadError(box: MarkerBox("ALIVE"))
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}
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do {
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try await closure()
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XCTFail("expected throw")
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} catch let error as ReferencePayloadError {
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print("[REPRO] ref / typed-throws async closure payload: \(error.box.marker)")
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XCTAssertEqual(error.box.marker, "ALIVE")
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}
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}
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func testControl_jsException_asyncFunction() async throws {
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do {
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try await asyncFunctionThrowsJSException()
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XCTFail("expected throw")
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} catch let error as JSException {
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let alive = error.thrownValue.object != nil
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print("[REPRO] jsexc / async function object!=nil: \(alive)")
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XCTAssertTrue(alive, "async function should preserve the thrown JS object")
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XCTAssertEqual(error.thrownValue.object?.message.string, "ALIVE")
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}
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}
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func testControl_jsException_untypedAsyncClosure() async throws {
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let closure: () async throws -> Void = {
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throw JSException(JSError(message: "ALIVE").jsValue)
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}
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do {
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try await closure()
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XCTFail("expected throw")
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} catch let error as JSException {
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let alive = error.thrownValue.object != nil
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print("[REPRO] jsexc / untyped async closure object!=nil: \(alive)")
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XCTAssertTrue(alive, "untyped async closure should preserve the thrown JS object")
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XCTAssertEqual(error.thrownValue.object?.message.string, "ALIVE")
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} catch {
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XCTFail("unexpected error type: \(error)")
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}
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}
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func testControl_jsException_capturingTypedThrowsAsyncClosure() async throws {
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let capturedMarker = "ALIVE"
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let closure: () async throws(JSException) -> Void = { () async throws(JSException) -> Void in
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throw JSException(JSError(message: capturedMarker).jsValue)
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}
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do {
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try await closure()
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XCTFail("expected throw")
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} catch let error as JSException {
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let alive = error.thrownValue.object != nil
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print("[REPRO] jsexc / capturing typed-throws closure object!=nil: \(alive)")
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XCTAssertTrue(alive, "capturing typed-throws async closure should preserve the thrown JS object")
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XCTAssertEqual(error.thrownValue.object?.message.string, "ALIVE")
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}
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}
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/// Asserts the current (buggy) behavior of swiftlang/swift#89320: the JSException payload is lost.
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/// When the compiler is fixed this test will fail; flip to XCTAssertTrue(alive).
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func testBug_jsException_typedThrowsAsyncClosure() async throws {
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let closure: () async throws(JSException) -> Void = { () async throws(JSException) -> Void in
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throw JSException(JSError(message: "ALIVE").jsValue)
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}
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do {
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try await closure()
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XCTFail("expected throw")
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} catch let error as JSException {
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let alive = error.thrownValue.object != nil
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print("[REPRO] jsexc / typed-throws async closure object!=nil: \(alive) <-- BUG: payload lost")
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XCTAssertFalse(
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alive,
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"""
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swiftlang/swift#89320 is expected to LOSE the JSException payload \
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thrown from a captureless typed-throws async closure. If this \
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assertion now fails, the compiler bug appears fixed -- flip this to \
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XCTAssertTrue(alive) and re-enable the message round-trip check.
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"""
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)
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}
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}
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/// Asserts the current (buggy) behavior of swiftlang/swift#89320 with a plain Swift
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/// error larger than the direct error convention: no JavaScriptKit types involved.
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func testBug_largePlainPayload_typedThrowsAsyncClosure() async throws {
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let expected = LargePayloadError(
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first: 0x1111_1111_1111_1111,
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second: 0x2222_2222_2222_2222,
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third: 0x3333_3333_3333_3333,
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marker: 0xA11FE
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)
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let closure: () async throws(LargePayloadError) -> Void = { () async throws(LargePayloadError) -> Void in
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throw LargePayloadError(
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first: 0x1111_1111_1111_1111,
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second: 0x2222_2222_2222_2222,
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third: 0x3333_3333_3333_3333,
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marker: 0xA11FE
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)
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}
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let observed = await largePayloadAfterThrow(closure)
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XCTAssertNotNil(observed, "expected throw")
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let observedDescription = observed.map {
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"first: \(String($0.first, radix: 16)) second: \(String($0.second, radix: 16)) "
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+ "third: \(String($0.third, radix: 16)) marker: \(String($0.marker, radix: 16))"
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}
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print("[REPRO] large / typed-throws async closure \(observedDescription ?? "nil") <-- BUG: payload lost")
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XCTAssertNotEqual(
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observed,
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expected,
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"""
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swiftlang/swift#89320 is expected to LOSE the large plain-Swift error \
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payload thrown from a captureless typed-throws async closure. If this \
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assertion now fails, the compiler bug appears fixed -- flip this to \
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assert the payload is preserved.
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"""
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)
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}
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}

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