ObjFW  Diff

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/*
 * Copyright (c) 2008-2021 Jonathan Schleifer <js@nil.im>
 * Copyright (c) 2008-2022 Jonathan Schleifer <js@nil.im>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
︙
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#include <string.h>

#import "ObjFWRT.h"
#import "private.h"

#ifdef OF_HAVE_THREADS
# import "OFPlainMutex.h"
# define NUM_SPINLOCKS 8	/* needs to be a power of 2 */
# define numSpinlocks 8	/* needs to be a power of 2 */
# define SPINLOCK_HASH(p) ((unsigned)((uintptr_t)p >> 4) & (NUM_SPINLOCKS - 1))
static OFSpinlock spinlocks[NUM_SPINLOCKS];
static OFSpinlock spinlocks[numSpinlocks];

static OF_INLINE size_t
spinlockSlot(const void *ptr)
{
	return ((size_t)((uintptr_t)ptr >> 4) & (numSpinlocks - 1));
}
#endif

#ifdef OF_HAVE_THREADS
OF_CONSTRUCTOR()
{
	for (size_t i = 0; i < NUM_SPINLOCKS; i++)
	for (size_t i = 0; i < numSpinlocks; i++)
		if (OFSpinlockNew(&spinlocks[i]) != 0)
			OBJC_ERROR("Failed to initialize spinlocks!");
			OBJC_ERROR("Failed to create spinlocks!");
}
#endif

id
objc_getProperty(id self, SEL _cmd, ptrdiff_t offset, bool atomic)
{
	if (atomic) {
		id *ptr = (id *)(void *)((char *)self + offset);
#ifdef OF_HAVE_THREADS
		unsigned hash = SPINLOCK_HASH(ptr);
		size_t slot = spinlockSlot(ptr);

		OFEnsure(OFSpinlockLock(&spinlocks[hash]) == 0);
		if (OFSpinlockLock(&spinlocks[slot]) != 0)
			OBJC_ERROR("Failed to lock spinlock!");
		@try {
			return [[*ptr retain] autorelease];
		} @finally {
			OFEnsure(OFSpinlockUnlock(&spinlocks[hash]) == 0);
			if (OFSpinlockUnlock(&spinlocks[slot]) != 0)
				OBJC_ERROR("Failed to unlock spinlock!");
		}
#else
		return [[*ptr retain] autorelease];
#endif
	}

	return *(id *)(void *)((char *)self + offset);
}

void
objc_setProperty(id self, SEL _cmd, ptrdiff_t offset, id value, bool atomic,
    signed char copy)
{
	if (atomic) {
		id *ptr = (id *)(void *)((char *)self + offset);
#ifdef OF_HAVE_THREADS
		unsigned hash = SPINLOCK_HASH(ptr);
		size_t slot = spinlockSlot(ptr);

		OFEnsure(OFSpinlockLock(&spinlocks[hash]) == 0);
		if (OFSpinlockLock(&spinlocks[slot]) != 0)
			OBJC_ERROR("Failed to lock spinlock!");
		@try {
#endif
			id old = *ptr;

			switch (copy) {
			case 0:
				*ptr = [value retain];
				break;
			case 2:
				*ptr = [value mutableCopy];
				break;
			default:
				*ptr = [value copy];
			}

			[old release];
#ifdef OF_HAVE_THREADS
		} @finally {
			OFEnsure(OFSpinlockUnlock(&spinlocks[hash]) == 0);
			if (OFSpinlockUnlock(&spinlocks[slot]) != 0)
				OBJC_ERROR("Failed to unlock spinlock!");
		}
#endif

		return;
	}

	id *ptr = (id *)(void *)((char *)self + offset);
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/* The following methods are only required for GCC >= 4.6 */
void
objc_getPropertyStruct(void *dest, const void *src, ptrdiff_t size, bool atomic,
    bool strong)
{
	if (atomic) {
#ifdef OF_HAVE_THREADS
		unsigned hash = SPINLOCK_HASH(src);
		size_t slot = spinlockSlot(src);

		OFEnsure(OFSpinlockLock(&spinlocks[hash]) == 0);
		if (OFSpinlockLock(&spinlocks[slot]) != 0)
			OBJC_ERROR("Failed to lock spinlock!");
#endif
		memcpy(dest, src, size);
#ifdef OF_HAVE_THREADS
		OFEnsure(OFSpinlockUnlock(&spinlocks[hash]) == 0);
		if (OFSpinlockUnlock(&spinlocks[slot]) != 0)
			OBJC_ERROR("Failed to unlock spinlock!");
#endif

		return;
	}

	memcpy(dest, src, size);
}

void
objc_setPropertyStruct(void *dest, const void *src, ptrdiff_t size, bool atomic,
    bool strong)
{
	if (atomic) {
#ifdef OF_HAVE_THREADS
		unsigned hash = SPINLOCK_HASH(src);
		size_t slot = spinlockSlot(src);

		OFEnsure(OFSpinlockLock(&spinlocks[hash]) == 0);
		if (OFSpinlockLock(&spinlocks[slot]) != 0)
			OBJC_ERROR("Failed to lock spinlock!");
#endif
		memcpy(dest, src, size);
#ifdef OF_HAVE_THREADS
		OFEnsure(OFSpinlockUnlock(&spinlocks[hash]) == 0);
		if (OFSpinlockUnlock(&spinlocks[slot]) != 0)
			OBJC_ERROR("Failed to unlock spinlock!");
#endif

		return;
	}

	memcpy(dest, src, size);
}
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	if (class == Nil) {
		if (outCount != NULL)
			*outCount = 0;

		return NULL;
	}

	objc_global_mutex_lock();
	objc_globalMutex_lock();

	count = 0;
	if (class->info & OBJC_CLASS_INFO_NEW_ABI)
		for (iter = class->propertyList; iter != NULL;
		    iter = iter->next)
			count += iter->count;

	if (count == 0) {
		if (outCount != NULL)
			*outCount = 0;

		objc_global_mutex_unlock();
		objc_globalMutex_unlock();
		return NULL;
	}

	properties = malloc((count + 1) * sizeof(objc_property_t));
	if (properties == NULL)
		OBJC_ERROR("Not enough memory to copy properties");

	i = 0;
	for (iter = class->propertyList; iter != NULL; iter = iter->next)
		for (unsigned int j = 0; j < iter->count; j++)
			properties[i++] = &iter->properties[j];

	OFEnsure(i == count);
	if (i != count)
		OBJC_ERROR("Fatal internal inconsistency!");

	properties[count] = NULL;

	if (outCount != NULL)
		*outCount = count;

	objc_global_mutex_unlock();
	objc_globalMutex_unlock();

	return properties;
}

const char *
property_getName(objc_property_t property)
{
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	BOOL_CASE('D', extendedAttributes, OBJC_PROPERTY_DYNAMIC)
	BOOL_CASE('W', extendedAttributes, OBJC_PROPERTY_WEAK)
#undef BOOL_CASE
	}

	if (nullIsError && ret == NULL)
		OBJC_ERROR("Not enough memory to copy property attribute "
		    "value");
		    "value!");

	return ret;
}
Fossil 2.23 [47362306a7] 2023-11-01 18:56:47
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