mirror of
https://github.com/darlinghq/darling-libobjc2.git
synced 2024-12-19 10:06:55 +00:00
106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
#include <stdlib.h>
|
|
#include <assert.h>
|
|
#include "objc/runtime.h"
|
|
#include "lock.h"
|
|
#include "loader.h"
|
|
#include "magic_objects.h"
|
|
|
|
/**
|
|
* Runtime lock. This is exposed in
|
|
*/
|
|
static mutex_t objc_runtime_mutex;
|
|
void *__objc_runtime_mutex = &objc_runtime_mutex;
|
|
|
|
void __objc_sync_init(void);
|
|
void __objc_init_selector_tables(void);
|
|
void __objc_init_protocol_table(void);
|
|
void __objc_init_class_tables(void);
|
|
void __objc_init_dispatch_tables(void);
|
|
void objc_send_load_message(Class class);
|
|
|
|
/* Number of threads that are alive. */
|
|
int __objc_runtime_threads_alive = 1; /* !T:MUTEX */
|
|
|
|
void __objc_exec_class(struct objc_module_abi_8 *module)
|
|
{
|
|
static BOOL first_run = YES;
|
|
|
|
// Check that this module uses an ABI version that we recognise.
|
|
// In future, we should pass the ABI version to the class / category load
|
|
// functions so that we can change various structures more easily.
|
|
assert(objc_check_abi_version(module->version, module->size));
|
|
|
|
if (first_run)
|
|
{
|
|
// Create the main runtime lock. This is not safe in theory, but in
|
|
// practice the first time that this function is called will be in the
|
|
// loader, from the main thread. Future loaders may run concurrently,
|
|
// but that is likely to break the semantics of a lot of languages, so
|
|
// we don't have to worry about it for a long time.
|
|
//
|
|
// The only case when this can potentially go badly wrong is when a
|
|
// pure-C main() function spawns two threads which then, concurrently,
|
|
// call dlopen() or equivalent, and the platform's implementation of
|
|
// this does not perform any synchronization.
|
|
INIT_LOCK(objc_runtime_mutex);
|
|
// Create the lock used to protect the creation of hidden classes by
|
|
// @synchronize()
|
|
__objc_sync_init();
|
|
|
|
// Create the various tables that the runtime needs.
|
|
__objc_init_selector_tables();
|
|
__objc_init_protocol_table();
|
|
__objc_init_class_tables();
|
|
__objc_init_dispatch_tables();
|
|
first_run = NO;
|
|
}
|
|
|
|
// The runtime mutex is held for the entire duration of a load. It does
|
|
// not need to be acquired or released in any of the called load functions.
|
|
LOCK_UNTIL_RETURN(__objc_runtime_mutex);
|
|
|
|
struct objc_symbol_table_abi_8 *symbols = module->symbol_table;
|
|
// Register all of the selectors used in this module.
|
|
if (symbols->selectors)
|
|
{
|
|
objc_register_selector_array(symbols->selectors,
|
|
symbols->selector_count);
|
|
}
|
|
|
|
unsigned short defs = 0;
|
|
// Load the classes from this module
|
|
for (unsigned short i=0 ; i<symbols->class_count ; i++)
|
|
{
|
|
objc_load_class(symbols->definitions[defs++]);
|
|
}
|
|
unsigned int category_start = defs;
|
|
// Load the categories from this module
|
|
for (unsigned short i=0 ; i<symbols->category_count; i++)
|
|
{
|
|
objc_try_load_category(symbols->definitions[defs++]);
|
|
}
|
|
// Load the static instances
|
|
struct objc_static_instance_list **statics = (void*)symbols->definitions[defs];
|
|
while (NULL != statics && NULL != *statics)
|
|
{
|
|
objc_init_statics(*(statics++));
|
|
}
|
|
|
|
// Load categories and statics that were deferred.
|
|
objc_load_buffered_categories();
|
|
objc_init_buffered_statics();
|
|
// Fix up the class links for loaded classes.
|
|
objc_resolve_class_links();
|
|
for (unsigned short i=0 ; i<symbols->category_count; i++)
|
|
{
|
|
struct objc_category *cat = (struct objc_category*)
|
|
symbols->definitions[category_start++];
|
|
Class class = (Class)objc_getClass(cat->class_name);
|
|
if ((Nil != class) &&
|
|
objc_test_class_flag(class, objc_class_flag_resolved))
|
|
{
|
|
objc_send_load_message(class);
|
|
}
|
|
}
|
|
}
|