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a8d4d57f11
rdar://105837040 * WIP: Store layout string in type metadata * WIP: More cases working * WIP: Layout strings almost working * Add layout string pointer to struct metadata * Fetch bytecode layout strings from metadata in runtime * More efficient bytecode layout * Add support for interpreted generics in layout strings * Layout string instantiation, take and more * Remove duplicate information from layout strings * Include size of previous object in next objects offset to reduce number of increments at runtime * Add support for existentials * Build type layout strings with StructBuilder to support target sizes and metadata pointers * Add support for resilient types * Properly cache layout strings in compiler * Generic resilient types working * Non-generic resilient types working * Instantiate resilient type in layout when possible * Fix a few issues around alignment and signing * Disable generics, fix static alignment * Fix MultiPayloadEnum size when no extra tag is necessary * Fixes after rebase * Cleanup * Fix most tests * Fix objcImplementattion and non-Darwin builds * Fix BytecodeLayouts on non-Darwin * Fix Linux build * Fix sizes in linux tests * Sign layout string pointers * Use nullptr instead of debug value
118 lines
3.8 KiB
C++
118 lines
3.8 KiB
C++
//===--- ErrorObjectNative.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 - 2017 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 https://swift.org/LICENSE.txt for license information
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// See https://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 Error
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// protocol 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 "swift/Runtime/Config.h"
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#if !SWIFT_OBJC_INTEROP
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#include <stdio.h>
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#include "swift/Runtime/Debug.h"
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#include "ErrorObject.h"
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#include "Private.h"
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using namespace swift;
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/// Determine the size and alignment of an Error 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 Error box.
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static SWIFT_CC(swift) void _destroyErrorObject(SWIFT_CONTEXT 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 Error boxes.
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static const FullMetadata<HeapMetadata> ErrorMetadata{
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HeapMetadataHeader{{nullptr}, {_destroyErrorObject}, {&VALUE_WITNESS_SYM(Bo)}},
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HeapMetadata(MetadataKind::ErrorObject),
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};
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BoxPair
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swift::swift_allocError(const swift::Metadata *type,
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const swift::WitnessTable *errorConformance,
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OpaqueValue *initialValue,
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bool isTake) {
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auto sizeAndAlign = _getErrorAllocatedSizeAndAlignmentMask(type);
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auto allocated = swift_allocObject(&ErrorMetadata,
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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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// If an initial value was given, copy or take it in.
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auto valuePtr = error->getValue();
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if (initialValue) {
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if (isTake)
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type->vw_initializeWithTake(valuePtr, initialValue);
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else
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type->vw_initializeWithCopy(valuePtr, initialValue);
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}
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return BoxPair{allocated, valuePtr};
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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_deallocUninitializedObject(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 *swift::swift_errorRetain(SwiftError *error) {
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return static_cast<SwiftError*>(swift_retain(error));
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}
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void swift::swift_errorRelease(SwiftError *error) {
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swift_release(error);
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}
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#endif
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