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39fa2f0228
Use the generic type lowering algorithm described in "docs/CallingConvention.rst#physical-lowering" to map from IRGen's explosion type to the type expected by the ABI. Change IRGen to use the swift calling convention (swiftcc) for native swift functions. Use the 'swiftself' attribute on self parameters and for closures contexts. Use the 'swifterror' parameter for swift error parameters. Change functions in the runtime that are called as native swift functions to use the swift calling convention. rdar://19978563
113 lines
3.7 KiB
C++
113 lines
3.7 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{{_destroyErrorObject}, {&VALUE_WITNESS_SYM(Bo)}},
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Metadata{MetadataKind::ErrorObject},
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};
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SWIFT_CC(swift) SWIFT_RUNTIME_EXPORT
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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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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_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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void swift::swift_willThrow(SwiftError *object) { }
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#endif
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