mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
f2bb319bdb
Minimize the generic class metadata template by removing the class header and base-class members. Add back the set of information that's really required for instantiation. Teach swift_allocateGenericClass how to allocate classes without superclass metadata. Reorder generic initialization to establish a stronger phase-ordering between allocation (the part that doesn't really care about the generic arguments) and initialization (the part that really does care about the generic arguments and therefore might need to be delayed to handle metadata cycles). A similar thing needs to happen for resilient class relocation.
112 lines
3.6 KiB
C++
112 lines
3.6 KiB
C++
//===--- ErrorObjectNative.cpp - Recoverable error object -----------------===//
|
|
//
|
|
// 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 the object representation of the standard Error
|
|
// protocol type, which represents recoverable errors in the language. This
|
|
// implementation is used when ObjC interop is disabled; the ObjC-interoperable
|
|
// version is implemented in ErrorObject.mm.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "swift/Runtime/Config.h"
|
|
|
|
#if !SWIFT_OBJC_INTEROP
|
|
|
|
#include <stdio.h>
|
|
#include "swift/Runtime/Debug.h"
|
|
#include "ErrorObject.h"
|
|
#include "Private.h"
|
|
|
|
using namespace swift;
|
|
|
|
/// Determine the size and alignment of an Error box containing the given
|
|
/// type.
|
|
static std::pair<size_t, size_t>
|
|
_getErrorAllocatedSizeAndAlignmentMask(const Metadata *type) {
|
|
// The value is tail-allocated after the SwiftError record with the
|
|
// appropriate alignment.
|
|
auto vw = type->getValueWitnesses();
|
|
size_t size = sizeof(SwiftError);
|
|
unsigned valueAlignMask = vw->getAlignmentMask();
|
|
size = (size + valueAlignMask) & ~(size_t)valueAlignMask;
|
|
size += vw->getSize();
|
|
|
|
size_t alignMask = (alignof(SwiftError) - 1) | valueAlignMask;
|
|
|
|
return {size, alignMask};
|
|
}
|
|
|
|
/// Destructor for an Error box.
|
|
static SWIFT_CC(swift) void _destroyErrorObject(SWIFT_CONTEXT HeapObject *obj) {
|
|
auto error = static_cast<SwiftError *>(obj);
|
|
|
|
// Destroy the value inside.
|
|
auto type = error->type;
|
|
type->vw_destroy(error->getValue());
|
|
|
|
// Deallocate the buffer.
|
|
auto sizeAndAlign = _getErrorAllocatedSizeAndAlignmentMask(type);
|
|
swift_deallocObject(obj, sizeAndAlign.first, sizeAndAlign.second);
|
|
}
|
|
|
|
/// Heap metadata for Error boxes.
|
|
static const FullMetadata<HeapMetadata> ErrorMetadata{
|
|
HeapMetadataHeader{{_destroyErrorObject}, {&VALUE_WITNESS_SYM(Bo)}},
|
|
HeapMetadata(MetadataKind::ErrorObject),
|
|
};
|
|
|
|
BoxPair
|
|
swift::swift_allocError(const swift::Metadata *type,
|
|
const swift::WitnessTable *errorConformance,
|
|
OpaqueValue *initialValue,
|
|
bool isTake) {
|
|
auto sizeAndAlign = _getErrorAllocatedSizeAndAlignmentMask(type);
|
|
|
|
auto allocated = swift_allocObject(&ErrorMetadata,
|
|
sizeAndAlign.first, sizeAndAlign.second);
|
|
|
|
auto error = reinterpret_cast<SwiftError*>(allocated);
|
|
|
|
error->type = type;
|
|
error->errorConformance = errorConformance;
|
|
|
|
// If an initial value was given, copy or take it in.
|
|
auto valuePtr = error->getValue();
|
|
if (initialValue) {
|
|
if (isTake)
|
|
type->vw_initializeWithTake(valuePtr, initialValue);
|
|
else
|
|
type->vw_initializeWithCopy(valuePtr, initialValue);
|
|
}
|
|
|
|
return BoxPair{allocated, valuePtr};
|
|
}
|
|
|
|
void
|
|
swift::swift_deallocError(SwiftError *error, const Metadata *type) {
|
|
auto sizeAndAlign = _getErrorAllocatedSizeAndAlignmentMask(type);
|
|
swift_deallocObject(error, sizeAndAlign.first, sizeAndAlign.second);
|
|
}
|
|
|
|
void
|
|
swift::swift_getErrorValue(const SwiftError *errorObject,
|
|
void **scratch,
|
|
ErrorValueResult *out) {
|
|
out->value = errorObject->getValue();
|
|
out->type = errorObject->type;
|
|
out->errorConformance = errorObject->errorConformance;
|
|
}
|
|
|
|
void swift::swift_willThrow(SwiftError *object) { }
|
|
|
|
#endif
|