/*
* Copyright (c) 2010-2012 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#include "objc-private.h"
#include "NSObject.h"
#include "objc-weak.h"
#include "llvm-DenseMap.h"
#include "NSObject.h"
#include <malloc/malloc.h>
#include <stdint.h>
#include <stdbool.h>
#include <mach/mach.h>
#include <mach-o/dyld.h>
#include <mach-o/nlist.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <libkern/OSAtomic.h>
#include <Block.h>
#include <map>
#include <execinfo.h>
@interface NSInvocation
- (SEL)selector;
@end
#if TARGET_OS_MAC
// NSObject used to be in Foundation/CoreFoundation.
#define SYMBOL_ELSEWHERE_IN_3(sym, vers, n) \
OBJC_EXPORT const char elsewhere_ ##n __asm__("$ld$hide$os" #vers "$" #sym); const char elsewhere_ ##n = 0
#define SYMBOL_ELSEWHERE_IN_2(sym, vers, n) \
SYMBOL_ELSEWHERE_IN_3(sym, vers, n)
#define SYMBOL_ELSEWHERE_IN(sym, vers) \
SYMBOL_ELSEWHERE_IN_2(sym, vers, __COUNTER__)
#if __OBJC2__
# define NSOBJECT_ELSEWHERE_IN(vers) \
SYMBOL_ELSEWHERE_IN(_OBJC_CLASS_$_NSObject, vers); \
SYMBOL_ELSEWHERE_IN(_OBJC_METACLASS_$_NSObject, vers); \
SYMBOL_ELSEWHERE_IN(_OBJC_IVAR_$_NSObject.isa, vers)
#else
# define NSOBJECT_ELSEWHERE_IN(vers) \
SYMBOL_ELSEWHERE_IN(.objc_class_name_NSObject, vers)
#endif
#if TARGET_OS_IPHONE
NSOBJECT_ELSEWHERE_IN(5.1);
NSOBJECT_ELSEWHERE_IN(5.0);
NSOBJECT_ELSEWHERE_IN(4.3);
NSOBJECT_ELSEWHERE_IN(4.2);
NSOBJECT_ELSEWHERE_IN(4.1);
NSOBJECT_ELSEWHERE_IN(4.0);
NSOBJECT_ELSEWHERE_IN(3.2);
NSOBJECT_ELSEWHERE_IN(3.1);
NSOBJECT_ELSEWHERE_IN(3.0);
NSOBJECT_ELSEWHERE_IN(2.2);
NSOBJECT_ELSEWHERE_IN(2.1);
NSOBJECT_ELSEWHERE_IN(2.0);
#else
NSOBJECT_ELSEWHERE_IN(10.7);
NSOBJECT_ELSEWHERE_IN(10.6);
NSOBJECT_ELSEWHERE_IN(10.5);
NSOBJECT_ELSEWHERE_IN(10.4);
NSOBJECT_ELSEWHERE_IN(10.3);
NSOBJECT_ELSEWHERE_IN(10.2);
NSOBJECT_ELSEWHERE_IN(10.1);
NSOBJECT_ELSEWHERE_IN(10.0);
#endif
// TARGET_OS_MAC
#endif
/***********************************************************************
* Weak ivar support
**********************************************************************/
static id defaultBadAllocHandler(Class cls)
{
_objc_fatal("attempt to allocate object of class '%s' failed",
cls->nameForLogging());
}
static id(*badAllocHandler)(Class) = &defaultBadAllocHandler;
static id callBadAllocHandler(Class cls)
{
// fixme add re-entrancy protection in case allocation fails inside handler
return (*badAllocHandler)(cls);
}
void _objc_setBadAllocHandler(id(*newHandler)(Class))
{
badAllocHandler = newHandler;
}
namespace {
#if TARGET_OS_EMBEDDED
# define SIDE_TABLE_STRIPE 8
#else
# define SIDE_TABLE_STRIPE 64
#endif
// should be a multiple of cache line size (64)
#define SIDE_TABLE_SIZE 128
// The order of these bits is important.
#define SIDE_TABLE_WEAKLY_REFERENCED (1UL<<0)
#define SIDE_TABLE_DEALLOCATING (1UL<<1) // MSB-ward of weak bit
#define SIDE_TABLE_RC_ONE (1UL<<2) // MSB-ward of deallocating bit
#define SIDE_TABLE_RC_PINNED (1UL<<(WORD_BITS-1))
#define SIDE_TABLE_RC_SHIFT 2
#define SIDE_TABLE_FLAG_MASK (SIDE_TABLE_RC_ONE-1)
// RefcountMap disguises its pointers because we
// don't want the table to act as a root for `leaks`.
typedef objc::DenseMap<DisguisedPtr<objc_object>,size_t,true> RefcountMap;
class SideTable {
private:
static uint8_t table_buf[SIDE_TABLE_STRIPE * SIDE_TABLE_SIZE];
public:
spinlock_t slock;
RefcountMap refcnts;
weak_table_t weak_table;
SideTable() : slock(SPINLOCK_INITIALIZER)
{
memset(&weak_table, 0, sizeof(weak_table));
}
~SideTable()
{
// never delete side_table in case other threads retain during exit
assert(0);
}
static SideTable *tableForPointer(const void *p)
{
# if SIDE_TABLE_STRIPE == 1
return (SideTable *)table_buf;
# else
uintptr_t a = (uintptr_t)p;
int index = ((a >> 4) ^ (a >> 9)) & (SIDE_TABLE_STRIPE - 1);
return (SideTable *)&table_buf[index * SIDE_TABLE_SIZE];
# endif
}
static void init() {
// use placement new instead of static ctor to avoid dtor at exit
for (int i = 0; i < SIDE_TABLE_STRIPE; i++) {
new (&table_buf[i * SIDE_TABLE_SIZE]) SideTable;
}
}
};
STATIC_ASSERT(sizeof(SideTable) <= SIDE_TABLE_SIZE);
__attribute__((aligned(SIDE_TABLE_SIZE))) uint8_t
SideTable::table_buf[SIDE_TABLE_STRIPE * SIDE_TABLE_SIZE];
// anonymous namespace
};
//
// The -fobjc-arc flag causes the compiler to issue calls to objc_{retain/release/autorelease/retain_block}
//
id objc_retainBlock(id x) {
return (id)_Block_copy(x);
}
//
// The following SHOULD be called by the compiler directly, but the request hasn't been made yet :-)
//
BOOL objc_should_deallocate(id object) {
return YES;
}
id
objc_retain_autorelease(id obj)
{
return objc_autorelease(objc_retain(obj));
}
void
objc_storeStrong(id *location, id obj)
{
id prev = *location;
if (obj == prev) {
return;
}
objc_retain(obj);
*location = obj;
objc_release(prev);
}
/**
* This function stores a new value into a __weak variable. It would
* be used anywhere a __weak variable is the target of an assignment.
*
* @param location The address of the weak pointer itself
* @param newObj The new object this weak ptr should now point to
*
* @return \e newObj
*/
id
objc_storeWeak(id *location, id newObj)
{
id oldObj;
SideTable *oldTable;
SideTable *newTable;
spinlock_t *lock1;
#if SIDE_TABLE_STRIPE > 1
spinlock_t *lock2;
#endif
// Acquire locks for old and new values.
// Order by lock address to prevent lock ordering problems.
// Retry if the old value changes underneath us.
retry:
oldObj = *location;
oldTable = SideTable::tableForPointer(oldObj);
newTable = SideTable::tableForPointer(newObj);
lock1 = &newTable->slock;
#if SIDE_TABLE_STRIPE > 1
lock2 = &oldTable->slock;
if (lock1 > lock2) {
spinlock_t *temp = lock1;
lock1 = lock2;
lock2 = temp;
}
if (lock1 != lock2) spinlock_lock(lock2);
#endif
spinlock_lock(lock1);
if (*location != oldObj) {
spinlock_unlock(lock1);
#if SIDE_TABLE_STRIPE > 1
if (lock1 != lock2) spinlock_unlock(lock2);
#endif
goto retry;
}
weak_unregister_no_lock(&oldTable->weak_table, oldObj, location);
newObj = weak_register_no_lock(&newTable->weak_table, newObj, location);
// weak_register_no_lock returns nil if weak store should be rejected
// Set is-weakly-referenced bit in refcount table.
if (newObj && !newObj->isTaggedPointer()) {
newObj->setWeaklyReferenced_nolock();
}
// Do not set *location anywhere else. That would introduce a race.
*location = newObj;
spinlock_unlock(lock1);
#if SIDE_TABLE_STRIPE > 1
if (lock1 != lock2) spinlock_unlock(lock2);
#endif
return newObj;
}
id
objc_loadWeakRetained(id *location)
{
id result;
SideTable *table;
spinlock_t *lock;
retry:
result = *location;
if (!result) return nil;
table = SideTable::tableForPointer(result);
lock = &table->slock;
spinlock_lock(lock);
if (*location != result) {
spinlock_unlock(lock);
goto retry;
}
result = weak_read_no_lock(&table->weak_table, location);
spinlock_unlock(lock);
return result;
}
/**
* This loads the object referenced by a weak pointer and returns it, after
* retaining and autoreleasing the object to ensure that it stays alive
* long enough for the caller to use it. This function would be used
* anywhere a __weak variable is used in an expression.
*
* @param location The weak pointer address
*
* @return The object pointed to by \e location, or \c nil if \e location is \c nil.
*/
id
objc_loadWeak(id *location)
{
if (!*location) return nil;
return objc_autorelease(objc_loadWeakRetained(location));
}
/**
* Initialize a fresh weak pointer to some object location.
* It would be used for code like:
*
* (The nil case)
* __weak id weakPtr;
* (The non-nil case)
* NSObject *o = ...;
* __weak id weakPtr = o;
*
* @param addr Address of __weak ptr.
* @param val Object ptr.
*/
id
objc_initWeak(id *addr, id val)
{
*addr = 0;
if (!val) return nil;
return objc_storeWeak(addr, val);
}
__attribute__((noinline, used)) void
objc_destroyWeak_slow(id *addr)
{
SideTable *oldTable;
spinlock_t *lock;
id oldObj;
// No need to see weak refs, we are destroying
// Acquire lock for old value only
// retry if the old value changes underneath us
retry:
oldObj = *addr;
oldTable = SideTable::tableForPointer(oldObj);
lock = &oldTable->slock;
spinlock_lock(lock);
if (*addr != oldObj) {
spinlock_unlock(lock);
goto retry;
}
weak_unregister_no_lock(&oldTable->weak_table, oldObj, addr);
spinlock_unlock(lock);
}
/**
* Destroys the relationship between a weak pointer
* and the object it is referencing in the internal weak
* table. If the weak pointer is not referencing anything,
* there is no need to edit the weak table.
*
* @param addr The weak pointer address.
*/
void
objc_destroyWeak(id *addr)
{
if (!*addr) return;
return objc_destroyWeak_slow(addr);
}
/**
* This function copies a weak pointer from one location to another,
* when the destination doesn't already contain a weak pointer. It
* would be used for code like:
*
* __weak id weakPtr1 = ...;
* __weak id weakPtr2 = weakPtr1;
*
* @param to weakPtr2 in this ex
* @param from weakPtr1
*/
void
objc_copyWeak(id *to, id *from)
{
id val = objc_loadWeakRetained(from);
objc_initWeak(to, val);
objc_release(val);
}
/**
* Move a weak pointer from one location to another.
* Before the move, the destination must be uninitialized.
* After the move, the source is nil.
*/
void
objc_moveWeak(id *to, id *from)
{
objc_copyWeak(to, from);
objc_storeWeak(from, 0);
}
/***********************************************************************
Autorelease pool implementation
A thread's autorelease pool is a stack of pointers.
Each pointer is either an object to release, or POOL_SENTINEL which is
an autorelease pool boundary.
A pool token is a pointer to the POOL_SENTINEL for that pool. When
the pool is popped, every object hotter than the sentinel is released.
The stack is divided into a doubly-linked list of pages. Pages are added
and deleted as necessary.
Thread-local storage points to the hot page, where newly autoreleased
objects are stored.
**********************************************************************/
BREAKPOINT_FUNCTION(void objc_autoreleaseNoPool(id obj));
namespace {
struct magic_t {
static const uint32_t M0 = 0xA1A1A1A1;
# define M1 "AUTORELEASE!"
static const size_t M1_len = 12;
uint32_t m[4];
magic_t() {
assert(M1_len == strlen(M1));
assert(M1_len == 3 * sizeof(m[1]));
m[0] = M0;
strncpy((char *)&m[1], M1, M1_len);
}
~magic_t() {
m[0] = m[1] = m[2] = m[3] = 0;
}
bool check() const {
return (m[0] == M0 && 0 == strncmp((char *)&m[1], M1, M1_len));
}
bool fastcheck() const {
#ifdef NDEBUG
return (m[0] == M0);
#else
return check();
#endif
}
# undef M1
};
// Set this to 1 to mprotect() autorelease pool contents
#define PROTECT_AUTORELEASEPOOL 0
class AutoreleasePoolPage
{
#define POOL_SENTINEL nil
static pthread_key_t const key = AUTORELEASE_POOL_KEY;
static uint8_t const SCRIBBLE = 0xA3; // 0xA3A3A3A3 after releasing
static size_t const SIZE =
#if PROTECT_AUTORELEASEPOOL
PAGE_MAX_SIZE; // must be multiple of vm page size
#else
PAGE_MAX_SIZE; // size and alignment, power of 2
#endif
static size_t const COUNT = SIZE / sizeof(id);
magic_t const magic;
id *next;
pthread_t const thread;
AutoreleasePoolPage * const parent;
AutoreleasePoolPage *child;
uint32_t const depth;
uint32_t hiwat;
// SIZE-sizeof(*this) bytes of contents follow
static void * operator new(size_t size) {
return malloc_zone_memalign(malloc_default_zone(), SIZE, SIZE);
}
static void operator delete(void * p) {
return free(p);
}
inline void protect() {
#if PROTECT_AUTORELEASEPOOL
mprotect(this, SIZE, PROT_READ);
check();
#endif
}
inline void unprotect() {
#if PROTECT_AUTORELEASEPOOL
check();
mprotect(this, SIZE, PROT_READ | PROT_WRITE);
#endif
}
AutoreleasePoolPage(AutoreleasePoolPage *newParent)
: magic(), next(begin()), thread(pthread_self()),
parent(newParent), child(nil),
depth(parent ? 1+parent->depth : 0),
hiwat(parent ? parent->hiwat : 0)
{
if (parent) {
parent->check();
assert(!parent->child);
parent->unprotect();
parent->child = this;
parent->protect();
}
protect();
}
~AutoreleasePoolPage()
{
check();
unprotect();
assert(empty());
// Not recursive: we don't want to blow out the stack
// if a thread accumulates a stupendous amount of garbage
assert(!child);
}
void busted(bool die = true)
{
magic_t right;
(die ? _objc_fatal : _objc_inform)
("autorelease pool page %p corrupted\n"
" magic 0x%08x 0x%08x 0x%08x 0x%08x\n"
" should be 0x%08x 0x%08x 0x%08x 0x%08x\n"
" pthread %p\n"
" should be %p\n",
this,
magic.m[0], magic.m[1], magic.m[2], magic.m[3],
right.m[0], right.m[1], right.m[2], right.m[3],
this->thread, pthread_self());
}
void check(bool die = true)
{
if (!magic.check() || !pthread_equal(thread, pthread_self())) {
busted(die);
}
}
void fastcheck(bool die = true)
{
if (! magic.fastcheck()) {
busted(die);
}
}
id * begin() {
return (id *) ((uint8_t *)this+sizeof(*this));
}
id * end() {
return (id *) ((uint8_t *)this+SIZE);
}
bool empty() {
return next == begin();
}
bool full() {
return next == end();
}
bool lessThanHalfFull() {
return (next - begin() < (end() - begin()) / 2);
}
id *add(id obj)
{
assert(!full());
unprotect();
id *ret = next; // faster than `return next-1` because of aliasing
*next++ = obj;
protect();
return ret;
}
void releaseAll()
{
releaseUntil(begin());
}
void releaseUntil(id *stop)
{
// Not recursive: we don't want to blow out the stack
// if a thread accumulates a stupendous amount of garbage
while (this->next != stop) {
// Restart from hotPage() every time, in case -release
// autoreleased more objects
AutoreleasePoolPage *page = hotPage();
// fixme I think this `while` can be `if`, but I can't prove it
while (page->empty()) {
page = page->parent;
setHotPage(page);
}
page->unprotect();
id obj = *--page->next;
memset((void*)page->next, SCRIBBLE, sizeof(*page->next));
page->protect();
if (obj != POOL_SENTINEL) {
objc_release(obj);
}
}
setHotPage(this);
#ifndef NDEBUG
// we expect any children to be completely empty
for (AutoreleasePoolPage *page = child; page; page = page->child) {
assert(page->empty());
}
#endif
}
void kill()
{
// Not recursive: we don't want to blow out the stack
// if a thread accumulates a stupendous amount of garbage
AutoreleasePoolPage *page = this;
while (page->child) page = page->child;
AutoreleasePoolPage *deathptr;
do {
deathptr = page;
page = page->parent;
if (page) {
page->unprotect();
page->child = nil;
page->protect();
}
delete deathptr;
} while (deathptr != this);
}
static void tls_dealloc(void *p)
{
// reinstate TLS value while we work
setHotPage((AutoreleasePoolPage *)p);
pop(0);
setHotPage(nil);
}
static AutoreleasePoolPage *pageForPointer(const void *p)
{
return pageForPointer((uintptr_t)p);
}
static AutoreleasePoolPage *pageForPointer(uintptr_t p)
{
AutoreleasePoolPage *result;
uintptr_t offset = p % SIZE;
assert(offset >= sizeof(AutoreleasePoolPage));
result = (AutoreleasePoolPage *)(p - offset);
result->fastcheck();
return result;
}
static inline AutoreleasePoolPage *hotPage()
{
AutoreleasePoolPage *result = (AutoreleasePoolPage *)
tls_get_direct(key);
if (result) result->fastcheck();
return result;
}
static inline void setHotPage(AutoreleasePoolPage *page)
{
if (page) page->fastcheck();
tls_set_direct(key, (void *)page);
}
static inline AutoreleasePoolPage *coldPage()
{
AutoreleasePoolPage *result = hotPage();
if (result) {
while (result->parent) {
result = result->parent;
result->fastcheck();
}
}
return result;
}
static inline id *autoreleaseFast(id obj)
{
AutoreleasePoolPage *page = hotPage();
if (page && !page->full()) {
return page->add(obj);
} else if (page) {
return autoreleaseFullPage(obj, page);
} else {
return autoreleaseNoPage(obj);
}
}
static __attribute__((noinline))
id *autoreleaseFullPage(id obj, AutoreleasePoolPage *page)
{
// The hot page is full.
// Step to the next non-full page, adding a new page if necessary.
// Then add the object to that page.
assert(page == hotPage() && page->full());
do {
if (page->child) page = page->child;
else page = new AutoreleasePoolPage(page);
} while (page->full());
setHotPage(page);
return page->add(obj);
}
static __attribute__((noinline))
id *autoreleaseNoPage(id obj)
{
// No pool in place.
assert(!hotPage());
if (obj != POOL_SENTINEL && DebugMissingPools) {
// We are pushing an object with no pool in place,
// and no-pool debugging was requested by environment.
_objc_inform("MISSING POOLS: Object %p of class %s "
"autoreleased with no pool in place - "
"just leaking - break on "
"objc_autoreleaseNoPool() to debug",
(void*)obj, object_getClassName(obj));
objc_autoreleaseNoPool(obj);
return nil;
}
// Install the first page.
AutoreleasePoolPage *page = new AutoreleasePoolPage(nil);
setHotPage(page);
// Push an autorelease pool boundary if it wasn't already requested.
if (obj != POOL_SENTINEL) {
page->add(POOL_SENTINEL);
}
// Push the requested object.
return page->add(obj);
}
public:
static inline id autorelease(id obj)
{
assert(obj);
assert(!obj->isTaggedPointer());
id *dest __unused = autoreleaseFast(obj);
assert(!dest || *dest == obj);
return obj;
}
static inline void *push()
{
id *dest = autoreleaseFast(POOL_SENTINEL);
assert(*dest == POOL_SENTINEL);
return dest;
}
static inline void pop(void *token)
{
AutoreleasePoolPage *page;
id *stop;
if (token) {
page = pageForPointer(token);
stop = (id *)token;
assert(*stop == POOL_SENTINEL);
} else {
// Token 0 is top-level pool
page = coldPage();
assert(page);
stop = page->begin();
}
if (PrintPoolHiwat) printHiwat();
page->releaseUntil(stop);
// memory: delete empty children
// hysteresis: keep one empty child if this page is more than half full
// special case: delete everything for pop(0)
// special case: delete everything for pop(top) with DebugMissingPools
if (!token ||
(DebugMissingPools && page->empty() && !page->parent))
{
page->kill();
setHotPage(nil);
} else if (page->child) {
if (page->lessThanHalfFull()) {
page->child->kill();
}
else if (page->child->child) {
page->child->child->kill();
}
}
}
static void init()
{
int r __unused = pthread_key_init_np(AutoreleasePoolPage::key,
AutoreleasePoolPage::tls_dealloc);
assert(r == 0);
}
void print()
{
_objc_inform("[%p] ................ PAGE %s %s %s", this,
full() ? "(full)" : "",
this == hotPage() ? "(hot)" : "",
this == coldPage() ? "(cold)" : "");
check(false);
for (id *p = begin(); p < next; p++) {
if (*p == POOL_SENTINEL) {
_objc_inform("[%p] ################ POOL %p", p, p);
} else {
_objc_inform("[%p] %#16lx %s",
p, (unsigned long)*p, object_getClassName(*p));
}
}
}
static void printAll()
{
_objc_inform("##############");
_objc_inform("AUTORELEASE POOLS for thread %p", pthread_self());
AutoreleasePoolPage *page;
ptrdiff_t objects = 0;
for (page = coldPage(); page; page = page->child) {
objects += page->next - page->begin();
}
_objc_inform("%llu releases pending.", (unsigned long long)objects);
for (page = coldPage(); page; page = page->child) {
page->print();
}
_objc_inform("##############");
}
static void printHiwat()
{
// Check and propagate high water mark
// Ignore high water marks under 256 to suppress noise.
AutoreleasePoolPage *p = hotPage();
uint32_t mark = p->depth*COUNT + (uint32_t)(p->next - p->begin());
if (mark > p->hiwat && mark > 256) {
for( ; p; p = p->parent) {
p->unprotect();
p->hiwat = mark;
p->protect();
}
_objc_inform("POOL HIGHWATER: new high water mark of %u "
"pending autoreleases for thread %p:",
mark, pthread_self());
void *stack[128];
int count = backtrace(stack, sizeof(stack)/sizeof(stack[0]));
char **sym = backtrace_symbols(stack, count);
for (int i = 0; i < count; i++) {
_objc_inform("POOL HIGHWATER: %s", sym[i]);
}
free(sym);
}
}
#undef POOL_SENTINEL
};
// anonymous namespace
};
/***********************************************************************
* Slow paths for inline control
**********************************************************************/
#if SUPPORT_NONPOINTER_ISA
NEVER_INLINE id
objc_object::rootRetain_overflow(bool tryRetain)
{
return rootRetain(tryRetain, true);
}
NEVER_INLINE bool
objc_object::rootRelease_underflow(bool performDealloc)
{
return rootRelease(performDealloc, true);
}
// Slow path of clearDeallocating()
// for weakly-referenced objects with indexed isa
NEVER_INLINE void
objc_object::clearDeallocating_weak()
{
assert(isa.indexed && isa.weakly_referenced);
SideTable *table = SideTable::tableForPointer(this);
spinlock_lock(&table->slock);
weak_clear_no_lock(&table->weak_table, (id)this);
spinlock_unlock(&table->slock);
}
#endif
__attribute__((noinline,used))
id
objc_object::rootAutorelease2()
{
assert(!isTaggedPointer());
return AutoreleasePoolPage::autorelease((id)this);
}
BREAKPOINT_FUNCTION(
void objc_overrelease_during_dealloc_error(void)
);
NEVER_INLINE
bool
objc_object::overrelease_error()
{
_objc_inform_now_and_on_crash("%s object %p overreleased while already deallocating; break on objc_overrelease_during_dealloc_error to debug", object_getClassName((id)this), this);
objc_overrelease_during_dealloc_error();
return false; // allow rootRelease() to tail-call this
}
/***********************************************************************
* Retain count operations for side table.
**********************************************************************/
#if !NDEBUG
// Used to assert that an object is not present in the side table.
bool
objc_object::sidetable_present()
{
bool result = false;
SideTable *table = SideTable::tableForPointer(this);
spinlock_lock(&table->slock);
RefcountMap::iterator it = table->refcnts.find(this);
if (it != table->refcnts.end()) result = true;
if (weak_is_registered_no_lock(&table->weak_table, (id)this)) result = true;
spinlock_unlock(&table->slock);
return result;
}
#endif
#if SUPPORT_NONPOINTER_ISA
void
objc_object::sidetable_lock()
{
SideTable *table = SideTable::tableForPointer(this);
spinlock_lock(&table->slock);
}
void
objc_object::sidetable_unlock()
{
SideTable *table = SideTable::tableForPointer(this);
spinlock_unlock(&table->slock);
}
// Move the entire retain count to the side table,
// as well as isDeallocating and weaklyReferenced.
void
objc_object::sidetable_moveExtraRC_nolock(size_t extra_rc,
bool isDeallocating,
bool weaklyReferenced)
{
assert(!isa.indexed); // should already be changed to not-indexed
SideTable *table = SideTable::tableForPointer(this);
size_t& refcntStorage = table->refcnts[this];
size_t oldRefcnt = refcntStorage;
// not deallocating - that was in the isa
assert((oldRefcnt & SIDE_TABLE_DEALLOCATING) == 0);
assert((oldRefcnt & SIDE_TABLE_WEAKLY_REFERENCED) == 0);
uintptr_t carry;
size_t refcnt = addc(oldRefcnt, extra_rc<<SIDE_TABLE_RC_SHIFT, 0, &carry);
if (carry) refcnt = SIDE_TABLE_RC_PINNED;
if (isDeallocating) refcnt |= SIDE_TABLE_DEALLOCATING;
if (weaklyReferenced) refcnt |= SIDE_TABLE_WEAKLY_REFERENCED;
refcntStorage = refcnt;
}
// Move some retain counts to the side table from the isa field.
// Returns true if the object is now pinned.
bool
objc_object::sidetable_addExtraRC_nolock(size_t delta_rc)
{
assert(isa.indexed);
SideTable *table = SideTable::tableForPointer(this);
size_t& refcntStorage = table->refcnts[this];
size_t oldRefcnt = refcntStorage;
// not deallocating - that is in the isa
assert((oldRefcnt & SIDE_TABLE_DEALLOCATING) == 0);
assert((oldRefcnt & SIDE_TABLE_WEAKLY_REFERENCED) == 0);
if (oldRefcnt & SIDE_TABLE_RC_PINNED) return true;
uintptr_t carry;
size_t newRefcnt =
addc(oldRefcnt, delta_rc << SIDE_TABLE_RC_SHIFT, 0, &carry);
if (carry) {
refcntStorage =
SIDE_TABLE_RC_PINNED | (oldRefcnt & SIDE_TABLE_FLAG_MASK);
return true;
}
else {
refcntStorage = newRefcnt;
return false;
}
}
// Move some retain counts from the side table to the isa field.
// Returns true if the sidetable retain count is now 0.
bool
objc_object::sidetable_subExtraRC_nolock(size_t delta_rc)
{
assert(isa.indexed);
SideTable *table = SideTable::tableForPointer(this);
size_t& refcntStorage = table->refcnts[this];
size_t oldRefcnt = refcntStorage;
// not deallocating - that is in the isa
assert((oldRefcnt & SIDE_TABLE_DEALLOCATING) == 0);
assert((oldRefcnt & SIDE_TABLE_WEAKLY_REFERENCED) == 0);
if (oldRefcnt < delta_rc) {
_objc_inform_now_and_on_crash("refcount underflow error for object %p",
this);
_objc_fatal("refcount underflow error for %s %p",
object_getClassName((id)this), this);
}
size_t newRefcnt = oldRefcnt - (delta_rc << SIDE_TABLE_RC_SHIFT);
if (newRefcnt == 0) {
table->refcnts.erase(this);
return true;
}
else {
refcntStorage = newRefcnt;
return false;
}
}
size_t
objc_object::sidetable_getExtraRC_nolock()
{
assert(isa.indexed);
SideTable *table = SideTable::tableForPointer(this);
RefcountMap::iterator it = table->refcnts.find(this);
assert(it != table->refcnts.end());
return it->second >> SIDE_TABLE_RC_SHIFT;
}
// SUPPORT_NONPOINTER_ISA
#endif
__attribute__((used,noinline,nothrow))
id
objc_object::sidetable_retain_slow(SideTable *table)
{
#if SUPPORT_NONPOINTER_ISA
assert(!isa.indexed);
#endif
spinlock_lock(&table->slock);
size_t& refcntStorage = table->refcnts[this];
if (! (refcntStorage & SIDE_TABLE_RC_PINNED)) {
refcntStorage += SIDE_TABLE_RC_ONE;
}
spinlock_unlock(&table->slock);
return (id)this;
}
id
objc_object::sidetable_retain()
{
#if SUPPORT_NONPOINTER_ISA
assert(!isa.indexed);
#endif
SideTable *table = SideTable::tableForPointer(this);
if (spinlock_trylock(&table->slock)) {
size_t& refcntStorage = table->refcnts[this];
if (! (refcntStorage & SIDE_TABLE_RC_PINNED)) {
refcntStorage += SIDE_TABLE_RC_ONE;
}
spinlock_unlock(&table->slock);
return (id)this;
}
return sidetable_retain_slow(table);
}
bool
objc_object::sidetable_tryRetain()
{
#if SUPPORT_NONPOINTER_ISA
assert(!isa.indexed);
#endif
SideTable *table = SideTable::tableForPointer(this);
// NO SPINLOCK HERE
// _objc_rootTryRetain() is called exclusively by _objc_loadWeak(),
// which already acquired the lock on our behalf.
// fixme can't do this efficiently with os_lock_handoff_s
// if (table->slock == 0) {
// _objc_fatal("Do not call -_tryRetain.");
// }
bool result = true;
RefcountMap::iterator it = table->refcnts.find(this);
if (it == table->refcnts.end()) {
table->refcnts[this] = SIDE_TABLE_RC_ONE;
} else if (it->second & SIDE_TABLE_DEALLOCATING) {
result = false;
} else if (! (it->second & SIDE_TABLE_RC_PINNED)) {
it->second += SIDE_TABLE_RC_ONE;
}
return result;
}
uintptr_t
objc_object::sidetable_retainCount()
{
SideTable *table = SideTable::tableForPointer(this);
size_t refcnt_result = 1;
spinlock_lock(&table->slock);
RefcountMap::iterator it = table->refcnts.find(this);
if (it != table->refcnts.end()) {
// this is valid for SIDE_TABLE_RC_PINNED too
refcnt_result += it->second >> SIDE_TABLE_RC_SHIFT;
}
spinlock_unlock(&table->slock);
return refcnt_result;
}
bool
objc_object::sidetable_isDeallocating()
{
SideTable *table = SideTable::tableForPointer(this);
// NO SPINLOCK HERE
// _objc_rootIsDeallocating() is called exclusively by _objc_storeWeak(),
// which already acquired the lock on our behalf.
// fixme can't do this efficiently with os_lock_handoff_s
// if (table->slock == 0) {
// _objc_fatal("Do not call -_isDeallocating.");
// }
RefcountMap::iterator it = table->refcnts.find(this);
return (it != table->refcnts.end()) && (it->second & SIDE_TABLE_DEALLOCATING);
}
bool
objc_object::sidetable_isWeaklyReferenced()
{
bool result = false;
SideTable *table = SideTable::tableForPointer(this);
spinlock_lock(&table->slock);
RefcountMap::iterator it = table->refcnts.find(this);
if (it != table->refcnts.end()) {
result = it->second & SIDE_TABLE_WEAKLY_REFERENCED;
}
spinlock_unlock(&table->slock);
return result;
}
void
objc_object::sidetable_setWeaklyReferenced_nolock()
{
#if SUPPORT_NONPOINTER_ISA
assert(!isa.indexed);
#endif
SideTable *table = SideTable::tableForPointer(this);
table->refcnts[this] |= SIDE_TABLE_WEAKLY_REFERENCED;
}
__attribute__((used,noinline,nothrow))
bool
objc_object::sidetable_release_slow(SideTable *table, bool performDealloc)
{
#if SUPPORT_NONPOINTER_ISA
assert(!isa.indexed);
#endif
bool do_dealloc = false;
spinlock_lock(&table->slock);
RefcountMap::iterator it = table->refcnts.find(this);
if (it == table->refcnts.end()) {
do_dealloc = true;
table->refcnts[this] = SIDE_TABLE_DEALLOCATING;
} else if (it->second < SIDE_TABLE_DEALLOCATING) {
// SIDE_TABLE_WEAKLY_REFERENCED may be set. Don't change it.
do_dealloc = true;
it->second |= SIDE_TABLE_DEALLOCATING;
} else if (! (it->second & SIDE_TABLE_RC_PINNED)) {
it->second -= SIDE_TABLE_RC_ONE;
}
spinlock_unlock(&table->slock);
if (do_dealloc && performDealloc) {
((void(*)(objc_object *, SEL))objc_msgSend)(this, SEL_dealloc);
}
return do_dealloc;
}
bool
objc_object::sidetable_release(bool performDealloc)
{
#if SUPPORT_NONPOINTER_ISA
assert(!isa.indexed);
#endif
SideTable *table = SideTable::tableForPointer(this);
bool do_dealloc = false;
if (spinlock_trylock(&table->slock)) {
RefcountMap::iterator it = table->refcnts.find(this);
if (it == table->refcnts.end()) {
do_dealloc = true;
table->refcnts[this] = SIDE_TABLE_DEALLOCATING;
} else if (it->second < SIDE_TABLE_DEALLOCATING) {
// SIDE_TABLE_WEAKLY_REFERENCED may be set. Don't change it.
do_dealloc = true;
it->second |= SIDE_TABLE_DEALLOCATING;
} else if (! (it->second & SIDE_TABLE_RC_PINNED)) {
it->second -= SIDE_TABLE_RC_ONE;
}
spinlock_unlock(&table->slock);
if (do_dealloc && performDealloc) {
((void(*)(objc_object *, SEL))objc_msgSend)(this, SEL_dealloc);
}
return do_dealloc;
}
return sidetable_release_slow(table, performDealloc);
}
void
objc_object::sidetable_clearDeallocating()
{
SideTable *table = SideTable::tableForPointer(this);
// clear any weak table items
// clear extra retain count and deallocating bit
// (fixme warn or abort if extra retain count == 0 ?)
spinlock_lock(&table->slock);
RefcountMap::iterator it = table->refcnts.find(this);
if (it != table->refcnts.end()) {
if (it->second & SIDE_TABLE_WEAKLY_REFERENCED) {
weak_clear_no_lock(&table->weak_table, (id)this);
}
table->refcnts.erase(it);
}
spinlock_unlock(&table->slock);
}
/***********************************************************************
* Optimized retain/release/autorelease entrypoints
**********************************************************************/
#if __OBJC2__
__attribute__((aligned(16)))
id
objc_retain(id obj)
{
if (!obj) return obj;
if (obj->isTaggedPointer()) return obj;
return obj->retain();
}
__attribute__((aligned(16)))
void
objc_release(id obj)
{
if (!obj) return;
if (obj->isTaggedPointer()) return;
return obj->release();
}
__attribute__((aligned(16)))
id
objc_autorelease(id obj)
{
if (!obj) return obj;
if (obj->isTaggedPointer()) return obj;
return obj->autorelease();
}
// OBJC2
#else
// not OBJC2
id objc_retain(id obj) { return [obj retain]; }
void objc_release(id obj) { [obj release]; }
id objc_autorelease(id obj) { return [obj autorelease]; }
#endif
/***********************************************************************
* Basic operations for root class implementations a.k.a. _objc_root*()
**********************************************************************/
bool
_objc_rootTryRetain(id obj)
{
assert(obj);
return obj->rootTryRetain();
}
bool
_objc_rootIsDeallocating(id obj)
{
assert(obj);
return obj->rootIsDeallocating();
}
void
objc_clear_deallocating(id obj)
{
assert(obj);
assert(!UseGC);
if (obj->isTaggedPointer()) return;
obj->clearDeallocating();
}
bool
_objc_rootReleaseWasZero(id obj)
{
assert(obj);
return obj->rootReleaseShouldDealloc();
}
id
_objc_rootAutorelease(id obj)
{
assert(obj);
// assert(!UseGC);
if (UseGC) return obj; // fixme CF calls this when GC is on
return obj->rootAutorelease();
}
uintptr_t
_objc_rootRetainCount(id obj)
{
assert(obj);
return obj->rootRetainCount();
}
id
_objc_rootRetain(id obj)
{
assert(obj);
return obj->rootRetain();
}
void
_objc_rootRelease(id obj)
{
assert(obj);
obj->rootRelease();
}
id
_objc_rootAllocWithZone(Class cls, malloc_zone_t *zone)
{
id obj;
#if __OBJC2__
// allocWithZone under __OBJC2__ ignores the zone parameter
(void)zone;
obj = class_createInstance(cls, 0);
#else
if (!zone || UseGC) {
obj = class_createInstance(cls, 0);
}
else {
obj = class_createInstanceFromZone(cls, 0, zone);
}
#endif
if (!obj) obj = callBadAllocHandler(cls);
return obj;
}
// Call [cls alloc] or [cls allocWithZone:nil], with appropriate
// shortcutting optimizations.
static ALWAYS_INLINE id
callAlloc(Class cls, bool checkNil, bool allocWithZone=false)
{
if (checkNil && !cls) return nil;
#if __OBJC2__
if (! cls->ISA()->hasCustomAWZ()) {
// No alloc/allocWithZone implementation. Go straight to the allocator.
// fixme store hasCustomAWZ in the non-meta class and
// add it to canAllocFast's summary
if (cls->canAllocFast()) {
// No ctors, raw isa, etc. Go straight to the metal.
bool dtor = cls->hasCxxDtor();
id obj = (id)calloc(1, cls->bits.fastInstanceSize());
if (!obj) return callBadAllocHandler(cls);
obj->initInstanceIsa(cls, dtor);
return obj;
}
else {
// Has ctor or raw isa or something. Use the slower path.
id obj = class_createInstance(cls, 0);
if (!obj) return callBadAllocHandler(cls);
return obj;
}
}
#endif
// No shortcuts available.
if (allocWithZone) return [cls allocWithZone:nil];
return [cls alloc];
}
// Base class implementation of +alloc. cls is not nil.
// Calls [cls allocWithZone:nil].
id
_objc_rootAlloc(Class cls)
{
return callAlloc(cls, false/*checkNil*/, true/*allocWithZone*/);
}
// Calls [cls alloc].
id
objc_alloc(Class cls)
{
return callAlloc(cls, true/*checkNil*/, false/*allocWithZone*/);
}
// Calls [cls allocWithZone:nil].
id
objc_allocWithZone(Class cls)
{
return callAlloc(cls, true/*checkNil*/, true/*allocWithZone*/);
}
void
_objc_rootDealloc(id obj)
{
assert(obj);
obj->rootDealloc();
}
void
_objc_rootFinalize(id obj __unused)
{
assert(obj);
assert(UseGC);
if (UseGC) {
return;
}
_objc_fatal("_objc_rootFinalize called with garbage collection off");
}
id
_objc_rootInit(id obj)
{
// In practice, it will be hard to rely on this function.
// Many classes do not properly chain -init calls.
return obj;
}
malloc_zone_t *
_objc_rootZone(id obj)
{
(void)obj;
if (gc_zone) {
return gc_zone;
}
#if __OBJC2__
// allocWithZone under __OBJC2__ ignores the zone parameter
return malloc_default_zone();
#else
malloc_zone_t *rval = malloc_zone_from_ptr(obj);
return rval ? rval : malloc_default_zone();
#endif
}
uintptr_t
_objc_rootHash(id obj)
{
if (UseGC) {
return _object_getExternalHash(obj);
}
return (uintptr_t)obj;
}
void *
objc_autoreleasePoolPush(void)
{
if (UseGC) return nil;
return AutoreleasePoolPage::push();
}
void
objc_autoreleasePoolPop(void *ctxt)
{
if (UseGC) return;
// fixme rdar://9167170
if (!ctxt) return;
AutoreleasePoolPage::pop(ctxt);
}
void *
_objc_autoreleasePoolPush(void)
{
return objc_autoreleasePoolPush();
}
void
_objc_autoreleasePoolPop(void *ctxt)
{
objc_autoreleasePoolPop(ctxt);
}
void
_objc_autoreleasePoolPrint(void)
{
if (UseGC) return;
AutoreleasePoolPage::printAll();
}
id
objc_autoreleaseReturnValue(id obj)
{
if (fastAutoreleaseForReturn(obj)) return obj;
return objc_autorelease(obj);
}
id
objc_retainAutoreleaseReturnValue(id obj)
{
return objc_autoreleaseReturnValue(objc_retain(obj));
}
id
objc_retainAutoreleasedReturnValue(id obj)
{
if (fastRetainFromReturn(obj)) return obj;
return objc_retain(obj);
}
id
objc_retainAutorelease(id obj)
{
return objc_autorelease(objc_retain(obj));
}
void
_objc_deallocOnMainThreadHelper(void *context)
{
id obj = (id)context;
[obj dealloc];
}
#undef objc_retainedObject
#undef objc_unretainedObject
#undef objc_unretainedPointer
// convert objc_objectptr_t to id, callee must take ownership.
id objc_retainedObject(objc_objectptr_t pointer) { return (id)pointer; }
// convert objc_objectptr_t to id, without ownership transfer.
id objc_unretainedObject(objc_objectptr_t pointer) { return (id)pointer; }
// convert id to objc_objectptr_t, no ownership transfer.
objc_objectptr_t objc_unretainedPointer(id object) { return object; }
void arr_init(void)
{
AutoreleasePoolPage::init();
SideTable::init();
}
@implementation NSObject
+ (void)load {
if (UseGC) gc_init2();
}
+ (void)initialize {
}
+ (id)self {
return (id)self;
}
- (id)self {
return self;
}
+ (Class)class {
return self;
}
- (Class)class {
return object_getClass(self);
}
+ (Class)superclass {
return self->superclass;
}
- (Class)superclass {
return [self class]->superclass;
}
+ (BOOL)isMemberOfClass:(Class)cls {
return object_getClass((id)self) == cls;
}
- (BOOL)isMemberOfClass:(Class)cls {
return [self class] == cls;
}
+ (BOOL)isKindOfClass:(Class)cls {
for (Class tcls = object_getClass((id)self); tcls; tcls = tcls->superclass) {
if (tcls == cls) return YES;
}
return NO;
}
- (BOOL)isKindOfClass:(Class)cls {
for (Class tcls = [self class]; tcls; tcls = tcls->superclass) {
if (tcls == cls) return YES;
}
return NO;
}
+ (BOOL)isSubclassOfClass:(Class)cls {
for (Class tcls = self; tcls; tcls = tcls->superclass) {
if (tcls == cls) return YES;
}
return NO;
}
+ (BOOL)isAncestorOfObject:(NSObject *)obj {
for (Class tcls = [obj class]; tcls; tcls = tcls->superclass) {
if (tcls == self) return YES;
}
return NO;
}
+ (BOOL)instancesRespondToSelector:(SEL)sel {
if (!sel) return NO;
return class_respondsToSelector(self, sel);
}
+ (BOOL)respondsToSelector:(SEL)sel {
if (!sel) return NO;
return class_respondsToSelector_inst(object_getClass(self), sel, self);
}
- (BOOL)respondsToSelector:(SEL)sel {
if (!sel) return NO;
return class_respondsToSelector_inst([self class], sel, self);
}
+ (BOOL)conformsToProtocol:(Protocol *)protocol {
if (!protocol) return NO;
for (Class tcls = self; tcls; tcls = tcls->superclass) {
if (class_conformsToProtocol(tcls, protocol)) return YES;
}
return NO;
}
- (BOOL)conformsToProtocol:(Protocol *)protocol {
if (!protocol) return NO;
for (Class tcls = [self class]; tcls; tcls = tcls->superclass) {
if (class_conformsToProtocol(tcls, protocol)) return YES;
}
return NO;
}
+ (NSUInteger)hash {
return _objc_rootHash(self);
}
- (NSUInteger)hash {
return _objc_rootHash(self);
}
+ (BOOL)isEqual:(id)obj {
return obj == (id)self;
}
- (BOOL)isEqual:(id)obj {
return obj == self;
}
+ (BOOL)isFault {
return NO;
}
- (BOOL)isFault {
return NO;
}
+ (BOOL)isProxy {
return NO;
}
- (BOOL)isProxy {
return NO;
}
+ (IMP)instanceMethodForSelector:(SEL)sel {
if (!sel) [self doesNotRecognizeSelector:sel];
return class_getMethodImplementation(self, sel);
}
+ (IMP)methodForSelector:(SEL)sel {
if (!sel) [self doesNotRecognizeSelector:sel];
return object_getMethodImplementation((id)self, sel);
}
- (IMP)methodForSelector:(SEL)sel {
if (!sel) [self doesNotRecognizeSelector:sel];
return object_getMethodImplementation(self, sel);
}
+ (BOOL)resolveClassMethod:(SEL)sel {
return NO;
}
+ (BOOL)resolveInstanceMethod:(SEL)sel {
return NO;
}
// Replaced by CF (throws an NSException)
+ (void)doesNotRecognizeSelector:(SEL)sel {
_objc_fatal("+[%s %s]: unrecognized selector sent to instance %p",
class_getName(self), sel_getName(sel), self);
}
// Replaced by CF (throws an NSException)
- (void)doesNotRecognizeSelector:(SEL)sel {
_objc_fatal("-[%s %s]: unrecognized selector sent to instance %p",
object_getClassName(self), sel_getName(sel), self);
}
+ (id)performSelector:(SEL)sel {
if (!sel) [self doesNotRecognizeSelector:sel];
return ((id(*)(id, SEL))objc_msgSend)((id)self, sel);
}
+ (id)performSelector:(SEL)sel withObject:(id)obj {
if (!sel) [self doesNotRecognizeSelector:sel];
return ((id(*)(id, SEL, id))objc_msgSend)((id)self, sel, obj);
}
+ (id)performSelector:(SEL)sel withObject:(id)obj1 withObject:(id)obj2 {
if (!sel) [self doesNotRecognizeSelector:sel];
return ((id(*)(id, SEL, id, id))objc_msgSend)((id)self, sel, obj1, obj2);
}
- (id)performSelector:(SEL)sel {
if (!sel) [self doesNotRecognizeSelector:sel];
return ((id(*)(id, SEL))objc_msgSend)(self, sel);
}
- (id)performSelector:(SEL)sel withObject:(id)obj {
if (!sel) [self doesNotRecognizeSelector:sel];
return ((id(*)(id, SEL, id))objc_msgSend)(self, sel, obj);
}
- (id)performSelector:(SEL)sel withObject:(id)obj1 withObject:(id)obj2 {
if (!sel) [self doesNotRecognizeSelector:sel];
return ((id(*)(id, SEL, id, id))objc_msgSend)(self, sel, obj1, obj2);
}
// Replaced by CF (returns an NSMethodSignature)
+ (NSMethodSignature *)instanceMethodSignatureForSelector:(SEL)sel {
_objc_fatal("+[NSObject instanceMethodSignatureForSelector:] "
"not available without CoreFoundation");
}
// Replaced by CF (returns an NSMethodSignature)
+ (NSMethodSignature *)methodSignatureForSelector:(SEL)sel {
_objc_fatal("+[NSObject methodSignatureForSelector:] "
"not available without CoreFoundation");
}
// Replaced by CF (returns an NSMethodSignature)
- (NSMethodSignature *)methodSignatureForSelector:(SEL)sel {
_objc_fatal("-[NSObject methodSignatureForSelector:] "
"not available without CoreFoundation");
}
+ (void)forwardInvocation:(NSInvocation *)invocation {
[self doesNotRecognizeSelector:(invocation ? [invocation selector] : 0)];
}
- (void)forwardInvocation:(NSInvocation *)invocation {
[self doesNotRecognizeSelector:(invocation ? [invocation selector] : 0)];
}
+ (id)forwardingTargetForSelector:(SEL)sel {
return nil;
}
- (id)forwardingTargetForSelector:(SEL)sel {
return nil;
}
// Replaced by CF (returns an NSString)
+ (NSString *)description {
return nil;
}
// Replaced by CF (returns an NSString)
- (NSString *)description {
return nil;
}
+ (NSString *)debugDescription {
return [self description];
}
- (NSString *)debugDescription {
return [self description];
}
+ (id)new {
return [callAlloc(self, false/*checkNil*/) init];
}
+ (id)retain {
return (id)self;
}
// Replaced by ObjectAlloc
- (id)retain {
return ((id)self)->rootRetain();
}
+ (BOOL)_tryRetain {
return YES;
}
// Replaced by ObjectAlloc
- (BOOL)_tryRetain {
return ((id)self)->rootTryRetain();
}
+ (BOOL)_isDeallocating {
return NO;
}
- (BOOL)_isDeallocating {
return ((id)self)->rootIsDeallocating();
}
+ (BOOL)allowsWeakReference {
return YES;
}
+ (BOOL)retainWeakReference {
return YES;
}
- (BOOL)allowsWeakReference {
return ! [self _isDeallocating];
}
- (BOOL)retainWeakReference {
return [self _tryRetain];
}
+ (oneway void)release {
}
// Replaced by ObjectAlloc
- (oneway void)release {
((id)self)->rootRelease();
}
+ (id)autorelease {
return (id)self;
}
// Replaced by ObjectAlloc
- (id)autorelease {
return ((id)self)->rootAutorelease();
}
+ (NSUInteger)retainCount {
return ULONG_MAX;
}
- (NSUInteger)retainCount {
return ((id)self)->rootRetainCount();
}
+ (id)alloc {
return _objc_rootAlloc(self);
}
// Replaced by ObjectAlloc
+ (id)allocWithZone:(struct _NSZone *)zone {
return _objc_rootAllocWithZone(self, (malloc_zone_t *)zone);
}
// Replaced by CF (throws an NSException)
+ (id)init {
return (id)self;
}
- (id)init {
return _objc_rootInit(self);
}
// Replaced by CF (throws an NSException)
+ (void)dealloc {
}
// Replaced by NSZombies
- (void)dealloc {
_objc_rootDealloc(self);
}
// Replaced by CF (throws an NSException)
+ (void)finalize {
}
- (void)finalize {
_objc_rootFinalize(self);
}
+ (struct _NSZone *)zone {
return (struct _NSZone *)_objc_rootZone(self);
}
- (struct _NSZone *)zone {
return (struct _NSZone *)_objc_rootZone(self);
}
+ (id)copy {
return (id)self;
}
+ (id)copyWithZone:(struct _NSZone *)zone {
return (id)self;
}
- (id)copy {
return [(id)self copyWithZone:nil];
}
+ (id)mutableCopy {
return (id)self;
}
+ (id)mutableCopyWithZone:(struct _NSZone *)zone {
return (id)self;
}
- (id)mutableCopy {
return [(id)self mutableCopyWithZone:nil];
}
@end