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#if defined(__clang__) && !defined(__OBJC_RUNTIME_INTERNAL__)
#pragma clang system_header
#endif
/**
* objc-auto.h - This file provides the interface for Objective-C garbage
* collection
*/
/**
* Flags passed to objc_collect. The low 2 bits specify the type of collection
* to perform, the remainder provide additional options.
*/
enum
{
/**
* Perform an incremental collection if the collection ratio has not been
* exceeded, or a full collection if it has.
*/
OBJC_RATIO_COLLECTION = 0,
/**
* Performs an incremental collection.
*/
OBJC_GENERATIONAL_COLLECTION = 1,
/**
* Performs a full collection.
*/
OBJC_FULL_COLLECTION = 2,
/**
* Repeatedly performs a full collection until collection does not find any
* new free memory.
*/
OBJC_EXHAUSTIVE_COLLECTION = 3,
/**
* Only runs the collector (in any mode) if the number of bytes allocated
* since the last collection is greater than the threshold.
*/
OBJC_COLLECT_IF_NEEDED = (1 << 3),
/**
* Does not return until the collector has finished running.
*/
OBJC_WAIT_UNTIL_DONE = (1 << 4),
};
/**
* Options for objc_clear_stack().
*/
enum
{
/** Ignored - provided for OS X compatibility. */
OBJC_CLEAR_RESIDENT_STACK = 1
};
/**
* Instructs the garbage collector to run.
*/
void objc_collect(unsigned long options);
/**
* Returns yes if the connector is currently running, i.e. if every call to
* objc_gc_disable() has been balanced with a corresponding call to
* objc_gc_enable().
*/
BOOL objc_collectingEnabled(void);
/**
* Returns YES if running in GC mode, NO otherwise.
*/
BOOL objc_collecting_enabled(void);
/**
* Starts concurrent collection. If this has been called, then finalizers will
* run in a separate thread.
*/
void objc_startCollectorThread(void);
/**
* Causes all finalizers for instances of the specified class to be run on the
* main thread. This is currently unimplemented.
*/
void objc_finalizeOnMainThread(Class cls);
/**
* Attempts to delete pointers currently stored on unused bits of the stack.
*/
void objc_clear_stack(unsigned long options);
/**
* Returns YES if an object has been finalized.
*/
BOOL objc_is_finalized(void *ptr);
/**
* Performs an atomic compare and exchange on a pointer value. Sets the value
* at objectLocation to replacement, if the current value is predicate.
*/
BOOL objc_atomicCompareAndSwapPtr(id predicate,
id replacement,
volatile id *objectLocation);
/**
* Performs an atomic compare and exchange on a pointer value. Sets the value
* at objectLocation to replacement, if the current value is predicate.
*/
BOOL objc_atomicCompareAndSwapPtrBarrier(id predicate,
id replacement,
volatile id *objectLocation);
/**
* Performs an atomic compare and exchange on a pointer value. Sets the value
* at objectLocation to replacement, if the current value is predicate.
*/
BOOL objc_atomicCompareAndSwapGlobal(id predicate,
id replacement,
volatile id *objectLocation);
/**
* Performs an atomic compare and exchange on a pointer value. Sets the value
* at objectLocation to replacement, if the current value is predicate.
*/
BOOL objc_atomicCompareAndSwapGlobalBarrier(id predicate,
id replacement,
volatile id *objectLocation);
/**
* Performs an atomic compare and exchange on a pointer value. Sets the value
* at objectLocation to replacement, if the current value is predicate.
*/
BOOL objc_atomicCompareAndSwapInstanceVariable(id predicate,
id replacement,
volatile id *objectLocation);
/**
* Performs an atomic compare and exchange on a pointer value. Sets the value
* at objectLocation to replacement, if the current value is predicate.
*/
BOOL objc_atomicCompareAndSwapInstanceVariableBarrier(id predicate,
id replacement,
volatile id *objectLocation);
////////////////////////////////////////////////////////////////////////////////
// The next group of functions are intended to be called automatically by the
// compiler. Normal user code will not call them.
////////////////////////////////////////////////////////////////////////////////
/**
* Performs a strong assignment. Stores val in *ptr, ensuring that the
* assignment is visible to the collector.
*/
id objc_assign_strongCast(id val, id *ptr);
/**
* Assigns val to the global pointed to by ptr, ensuring that the assignment is
* visible to the collector.
*/
id objc_assign_global(id val, id *ptr);
/**
* Assigns val to the instance variable offset bytes from dest.
*/
id objc_assign_ivar(id val, id dest, ptrdiff_t offset);
/**
* Performs a memmove() operation, ensuring that the copied bytes are always
* visible to the collector.
*/
void *objc_memmove_collectable(void *dst, const void *src, size_t size);
/**
* Reads a weak pointer value. All reads of pointers declared __weak MUST be
* via this call.
*/
id objc_read_weak(id *location);
/**
* Assigns a value to location, which MUST have been declared __weak. All
* assignments to weak pointers must go via this function.
*/
id objc_assign_weak(id value, id *location);
/**
* Registers the current thread with the garbage collector. Should be done as
* soon as a thread is created. Until this is called, the thread's stack will
* be invisible to the collector.
*/
void objc_registerThreadWithCollector(void);
/**
* Unregisters the current thread. The thread's stack becomes invisible to the
* collector. This should be called just before the thread exits.
*/
void objc_unregisterThreadWithCollector(void);
/**
* Registers the current thread with the garbage collector and aborts if the
* registration failed. The thread is expected to have already been
* registered. This will print a warning message if it has not been.
*/
void objc_assertRegisteredThreadWithCollector();
////////////////////////////////////////////////////////////////////////////////
// Functions below this line are extensions to the OS X GC API, intended to
// allow implementation of the higher-level public APIs
////////////////////////////////////////////////////////////////////////////////
/**
* Disables the garbage collector until it is reenabled with objc_gc_enable.
*/
void objc_gc_disable(void);
/**
* Enables the garbage collector, if it has been previously disabled with a
* call to objc_gc_disable(). These calls store an internal count. If
* objc_gc_disable() is called twice, then collection will not resume until
* objc_gc_enable() has also been called twice.
*/
void objc_gc_enable(void);
/**
* Increments the reference count of objects. This is intended to be used to
* implement CFRetain(). Reference counts should only be used when storing
* pointers to objects in untracked allocations (e.g. malloc() memory).
*
* This function is intended to be used to implement CFRetain().
*/
id objc_gc_retain(id object);
/**
* Decrements the reference count on an object. An object becomes eligible for
* automatic collection when its reference count reaches zero. New objects
* have a reference count of zero, so they are eligible for collection as soon
* as the last pointer to them vanishes.
*
* This function is intended to be used to implement CFRelease().
*/
void objc_gc_release(id object);
/**
* Returns the retain count of an object. This is 0 for objects that have not
* had objc_gc_retain() called on them, which should be most objects in a
* garbage-collected program.
*/
int objc_gc_retain_count(id object);
/**
* Allocates a buffer of memory, which will be automatically deallocated by the
* collector. If isScanned is true, then this memory may contain pointers. If
* not, then pointers stored in the returned region will be ignored.
*
* This function is intended to be used to implement NSAllocateCollectable().
*/
void* objc_gc_allocate_collectable(size_t size, BOOL isScanned);
/**
* Reallocates a block of collectable memory.
*/
void* objc_gc_reallocate_collectable(void *ptr, size_t size, BOOL isScanned);
/**
* If the pointer lies in a collectible memory region, returns the address at
* the start of this region. Otherwise, returns NULL.
*/
void* objc_gc_collectable_address(void* ptr);
/**
* Registers a class that should be copied on assignment to heap locations.
* For performance reasons, the runtime only permits a small number of classes
* to be registered. These will always be copied when they are assigned, using
* the function specified in the second argument.
*/
BOOL objc_register_stack_class(Class cls, IMP copyFunction);
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