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121ef3ef9f
I asked that the patches were split up so I could do post commit review. This reverts commit r32059. This reverts commit r32058. This reverts commit r32056. This reverts commit r32055. Swift SVN r32060
108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
//===--- ErrorObject.cpp - Recoverable error object -----------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This implements the object representation of the standard ErrorType protocol
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// type, which represents recoverable errors in the language. This
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// implementation is used when ObjC interop is disabled; the ObjC-interoperable
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// version is implemented in ErrorObject.mm.
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//
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//===----------------------------------------------------------------------===//
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#include <stdio.h>
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#include "Debug.h"
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#include "ErrorObject.h"
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#include "Private.h"
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#if !SWIFT_OBJC_INTEROP
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using namespace swift;
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/// Determine the size and alignment of an ErrorType box containing the given
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/// type.
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static std::pair<size_t, size_t>
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_getErrorAllocatedSizeAndAlignmentMask(const Metadata *type) {
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// The value is tail-allocated after the SwiftError record with the
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// appropriate alignment.
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auto vw = type->getValueWitnesses();
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size_t size = sizeof(SwiftError);
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unsigned valueAlignMask = vw->getAlignmentMask();
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size = (size + valueAlignMask) & ~(size_t)valueAlignMask;
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size += vw->getSize();
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size_t alignMask = (alignof(SwiftError) - 1) | valueAlignMask;
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return {size, alignMask};
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}
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/// Destructor for an ErrorType box.
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static void _destroyErrorObject(HeapObject *obj) {
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auto error = static_cast<SwiftError *>(obj);
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// Destroy the value inside.
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auto type = error->type;
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type->vw_destroy(error->getValue());
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// Deallocate the buffer.
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auto sizeAndAlign = _getErrorAllocatedSizeAndAlignmentMask(type);
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swift_deallocObject(obj, sizeAndAlign.first, sizeAndAlign.second);
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}
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/// Heap metadata for ErrorType boxes.
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static const FullMetadata<HeapMetadata> ErrorTypeMetadata{
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HeapMetadataHeader{{_destroyErrorObject}, {&_TWVBo}},
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Metadata{MetadataKind::ErrorObject},
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};
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BoxPair::Return
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swift::swift_allocError(const swift::Metadata *type,
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const swift::WitnessTable *errorConformance) {
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auto sizeAndAlign = _getErrorAllocatedSizeAndAlignmentMask(type);
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auto allocated = swift_allocObject(&ErrorTypeMetadata,
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sizeAndAlign.first, sizeAndAlign.second);
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auto error = reinterpret_cast<SwiftError*>(allocated);
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error->type = type;
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error->errorConformance = errorConformance;
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return BoxPair{allocated, error->getValue()};
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}
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void
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swift::swift_deallocError(SwiftError *error, const Metadata *type) {
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auto sizeAndAlign = _getErrorAllocatedSizeAndAlignmentMask(type);
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swift_deallocObject(error, sizeAndAlign.first, sizeAndAlign.second);
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}
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void
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swift::swift_getErrorValue(const SwiftError *errorObject,
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void **scratch,
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ErrorValueResult *out) {
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out->value = errorObject->getValue();
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out->type = errorObject->type;
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out->errorConformance = errorObject->errorConformance;
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}
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SwiftError *
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swift::swift_errorRetain(SwiftError *object) {
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return static_cast<SwiftError*>(swift_retain(object));
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}
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void swift::swift_errorRelease(SwiftError *object) {
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swift_release(object);
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}
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void swift::swift_willThrow(SwiftError *object) { }
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#endif
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