| //===--- ErrorDefaultImpls.cpp - Error default implementations ------------===// |
| // |
| // This source file is part of the Swift.org open source project |
| // |
| // Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors |
| // Licensed under Apache License v2.0 with Runtime Library Exception |
| // |
| // See https://swift.org/LICENSE.txt for license information |
| // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This implements helpers for the default implementations of Error protocol |
| // members. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "swift/Runtime/Config.h" |
| #include "swift/Runtime/Metadata.h" |
| using namespace swift; |
| |
| // @_silgen_name("swift_getDefaultErrorCode") |
| // func _swift_getDefaultErrorCode<T : Error>(_ x: T) -> Int |
| SWIFT_CC(swift) SWIFT_RT_ENTRY_VISIBILITY |
| intptr_t swift_getDefaultErrorCode(OpaqueValue *error, |
| const Metadata *T, |
| const WitnessTable *Error) { |
| intptr_t result; |
| |
| switch (T->getKind()) { |
| case MetadataKind::Enum: |
| // Enum tags use negative values for payload cases, so adjust code to be |
| // in the range [0, num-cases). |
| result = T->vw_getEnumTag(error) + |
| T->getNominalTypeDescriptor()->Enum.getNumPayloadCases(); |
| break; |
| |
| case MetadataKind::Class: |
| case MetadataKind::ObjCClassWrapper: |
| case MetadataKind::ForeignClass: |
| case MetadataKind::Function: |
| case MetadataKind::Struct: |
| case MetadataKind::Optional: |
| case MetadataKind::Opaque: |
| case MetadataKind::Tuple: |
| case MetadataKind::Existential: |
| case MetadataKind::Metatype: |
| case MetadataKind::ExistentialMetatype: |
| case MetadataKind::HeapLocalVariable: |
| case MetadataKind::HeapGenericLocalVariable: |
| case MetadataKind::ErrorObject: |
| result = 1; |
| break; |
| } |
| |
| // Destroy the value. |
| T->vw_destroy(error); |
| return result; |
| } |