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5cdc9f3fd1
Implement these backstops in the stdlib instead of the runtime, where we can at least interpolate the error value and give a slightly more informative error. Could still be improved by handing the source location down from the point of the crash instead of using the location from the stdlib source. Somewhat addresses rdar://problem/20807523. Swift SVN r29401
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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