892 lines
27 KiB
C
892 lines
27 KiB
C
/* GNU Objective C Runtime initialization
|
|
Copyright (C) 1993, 1995, 1996, 1997, 2002 Free Software Foundation, Inc.
|
|
Contributed by Kresten Krab Thorup
|
|
+load support contributed by Ovidiu Predescu <ovidiu@net-community.com>
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify it under the
|
|
terms of the GNU General Public License as published by the Free Software
|
|
Foundation; either version 2, or (at your option) any later version.
|
|
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
|
|
details.
|
|
|
|
You should have received a copy of the GNU General Public License along with
|
|
GCC; see the file COPYING. If not, write to the Free Software
|
|
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
|
|
/* As a special exception, if you link this library with files compiled with
|
|
GCC to produce an executable, this does not cause the resulting executable
|
|
to be covered by the GNU General Public License. This exception does not
|
|
however invalidate any other reasons why the executable file might be
|
|
covered by the GNU General Public License. */
|
|
|
|
#include "runtime.h"
|
|
|
|
/* The version number of this runtime. This must match the number
|
|
defined in gcc (objc-act.c). */
|
|
#define OBJC_VERSION 8
|
|
#define PROTOCOL_VERSION 2
|
|
|
|
/* This list contains all modules currently loaded into the runtime. */
|
|
static struct objc_list *__objc_module_list = 0; /* !T:MUTEX */
|
|
|
|
/* This list contains all proto_list's not yet assigned class links. */
|
|
static struct objc_list *unclaimed_proto_list = 0; /* !T:MUTEX */
|
|
|
|
/* List of unresolved static instances. */
|
|
static struct objc_list *uninitialized_statics = 0; /* !T:MUTEX */
|
|
|
|
/* Global runtime "write" mutex. */
|
|
objc_mutex_t __objc_runtime_mutex = 0;
|
|
|
|
/* Number of threads that are alive. */
|
|
int __objc_runtime_threads_alive = 1; /* !T:MUTEX */
|
|
|
|
/* Check compiler vs runtime version. */
|
|
static void init_check_module_version (Module_t);
|
|
|
|
/* Assign isa links to protos. */
|
|
static void __objc_init_protocols (struct objc_protocol_list *protos);
|
|
|
|
/* Add protocol to class. */
|
|
static void __objc_class_add_protocols (Class, struct objc_protocol_list *);
|
|
|
|
/* This is a hook which is called by __objc_exec_class every time a
|
|
class or a category is loaded into the runtime. This may e.g. help
|
|
a dynamic loader determine the classes that have been loaded when
|
|
an object file is dynamically linked in. */
|
|
void (*_objc_load_callback) (Class class, Category *category); /* !T:SAFE */
|
|
|
|
/* Is all categories/classes resolved? */
|
|
BOOL __objc_dangling_categories = NO; /* !T:UNUSED */
|
|
|
|
extern SEL
|
|
__sel_register_typed_name (const char *name, const char *types,
|
|
struct objc_selector *orig, BOOL is_const);
|
|
|
|
/* Sends +load to all classes and categories in certain situations. */
|
|
static void objc_send_load (void);
|
|
|
|
/* Inserts all the classes defined in module in a tree of classes that
|
|
resembles the class hierarchy. This tree is traversed in preorder
|
|
and the classes in its nodes receive the +load message if these
|
|
methods were not executed before. The algorithm ensures that when
|
|
the +load method of a class is executed all the superclasses have
|
|
been already received the +load message. */
|
|
static void __objc_create_classes_tree (Module_t module);
|
|
|
|
static void __objc_call_callback (Module_t module);
|
|
|
|
/* A special version that works only before the classes are completely
|
|
installed in the runtime. */
|
|
static BOOL class_is_subclass_of_class (Class class, Class superclass);
|
|
|
|
typedef struct objc_class_tree {
|
|
Class class;
|
|
struct objc_list *subclasses; /* `head' is pointer to an objc_class_tree */
|
|
} objc_class_tree;
|
|
|
|
/* This is a linked list of objc_class_tree trees. The head of these
|
|
trees are root classes (their super class is Nil). These different
|
|
trees represent different class hierarchies. */
|
|
static struct objc_list *__objc_class_tree_list = NULL;
|
|
|
|
/* Keeps the +load methods who have been already executed. This hash
|
|
should not be destroyed during the execution of the program. */
|
|
static cache_ptr __objc_load_methods = NULL;
|
|
|
|
/* This function is used when building the class tree used to send
|
|
ordinately the +load message to all classes needing it. The tree
|
|
is really needed so that superclasses will get the message before
|
|
subclasses.
|
|
|
|
This tree will contain classes which are being loaded (or have just
|
|
being loaded), and whose super_class pointers have not yet been
|
|
resolved. This implies that their super_class pointers point to a
|
|
string with the name of the superclass; when the first message is
|
|
sent to the class (/an object of that class) the class links will
|
|
be resolved, which will replace the super_class pointers with
|
|
pointers to the actual superclasses.
|
|
|
|
Unfortunately, the tree might also contain classes which had been
|
|
loaded previously, and whose class links have already been
|
|
resolved.
|
|
|
|
This function returns the superclass of a class in both cases, and
|
|
can be used to build the determine the class relationships while
|
|
building the tree.
|
|
*/
|
|
static Class class_superclass_of_class (Class class)
|
|
{
|
|
char *super_class_name;
|
|
|
|
/* If the class links have been resolved, use the resolved
|
|
* links. */
|
|
if (CLS_ISRESOLV (class))
|
|
return class->super_class;
|
|
|
|
/* Else, 'class' has not yet been resolved. This means that its
|
|
* super_class pointer is really the name of the super class (rather
|
|
* than a pointer to the actual superclass). */
|
|
super_class_name = (char *)class->super_class;
|
|
|
|
/* Return Nil for a root class. */
|
|
if (super_class_name == NULL)
|
|
return Nil;
|
|
|
|
/* Lookup the superclass of non-root classes. */
|
|
return objc_lookup_class (super_class_name);
|
|
}
|
|
|
|
|
|
/* Creates a tree of classes whose topmost class is directly inherited
|
|
from `upper' and the bottom class in this tree is
|
|
`bottom_class'. The classes in this tree are super classes of
|
|
`bottom_class'. `subclasses' member of each tree node point to the
|
|
next subclass tree node. */
|
|
|
|
static objc_class_tree *
|
|
create_tree_of_subclasses_inherited_from (Class bottom_class, Class upper)
|
|
{
|
|
Class superclass = bottom_class->super_class ?
|
|
objc_lookup_class ((char *) bottom_class->super_class)
|
|
: Nil;
|
|
|
|
objc_class_tree *tree, *prev;
|
|
|
|
DEBUG_PRINTF ("create_tree_of_subclasses_inherited_from:");
|
|
DEBUG_PRINTF ("bottom_class = %s, upper = %s\n",
|
|
(bottom_class ? bottom_class->name : NULL),
|
|
(upper ? upper->name : NULL));
|
|
|
|
tree = prev = objc_calloc (1, sizeof (objc_class_tree));
|
|
prev->class = bottom_class;
|
|
|
|
while (superclass != upper)
|
|
{
|
|
tree = objc_calloc (1, sizeof (objc_class_tree));
|
|
tree->class = superclass;
|
|
tree->subclasses = list_cons (prev, tree->subclasses);
|
|
superclass = class_superclass_of_class (superclass);
|
|
prev = tree;
|
|
}
|
|
|
|
return tree;
|
|
}
|
|
|
|
/* Insert the `class' into the proper place in the `tree' class
|
|
hierarchy. This function returns a new tree if the class has been
|
|
successfully inserted into the tree or NULL if the class is not
|
|
part of the classes hierarchy described by `tree'. This function is
|
|
private to objc_tree_insert_class (), you should not call it
|
|
directly. */
|
|
|
|
static objc_class_tree *
|
|
__objc_tree_insert_class (objc_class_tree *tree, Class class)
|
|
{
|
|
DEBUG_PRINTF ("__objc_tree_insert_class: tree = %x, class = %s\n",
|
|
tree, class->name);
|
|
|
|
if (tree == NULL)
|
|
return create_tree_of_subclasses_inherited_from (class, NULL);
|
|
else if (class == tree->class)
|
|
{
|
|
/* `class' has been already inserted */
|
|
DEBUG_PRINTF ("1. class %s was previously inserted\n", class->name);
|
|
return tree;
|
|
}
|
|
else if (class_superclass_of_class (class) == tree->class)
|
|
{
|
|
/* If class is a direct subclass of tree->class then add class to the
|
|
list of subclasses. First check to see if it wasn't already
|
|
inserted. */
|
|
struct objc_list *list = tree->subclasses;
|
|
objc_class_tree *node;
|
|
|
|
while (list)
|
|
{
|
|
/* Class has been already inserted; do nothing just return
|
|
the tree. */
|
|
if (((objc_class_tree *) list->head)->class == class)
|
|
{
|
|
DEBUG_PRINTF ("2. class %s was previously inserted\n",
|
|
class->name);
|
|
return tree;
|
|
}
|
|
list = list->tail;
|
|
}
|
|
|
|
/* Create a new node class and insert it into the list of subclasses */
|
|
node = objc_calloc (1, sizeof (objc_class_tree));
|
|
node->class = class;
|
|
tree->subclasses = list_cons (node, tree->subclasses);
|
|
DEBUG_PRINTF ("3. class %s inserted\n", class->name);
|
|
return tree;
|
|
}
|
|
else
|
|
{
|
|
/* The class is not a direct subclass of tree->class. Search for
|
|
class's superclasses in the list of subclasses. */
|
|
struct objc_list *subclasses = tree->subclasses;
|
|
|
|
/* Precondition: the class must be a subclass of tree->class;
|
|
otherwise return NULL to indicate our caller that it must
|
|
take the next tree. */
|
|
if (! class_is_subclass_of_class (class, tree->class))
|
|
return NULL;
|
|
|
|
for (; subclasses != NULL; subclasses = subclasses->tail)
|
|
{
|
|
Class aClass = ((objc_class_tree *) (subclasses->head))->class;
|
|
|
|
if (class_is_subclass_of_class (class, aClass))
|
|
{
|
|
/* If we found one of class's superclasses we insert the
|
|
class into its subtree and return the original tree
|
|
since nothing has been changed. */
|
|
subclasses->head
|
|
= __objc_tree_insert_class (subclasses->head, class);
|
|
DEBUG_PRINTF ("4. class %s inserted\n", class->name);
|
|
return tree;
|
|
}
|
|
}
|
|
|
|
/* We haven't found a subclass of `class' in the `subclasses'
|
|
list. Create a new tree of classes whose topmost class is a
|
|
direct subclass of tree->class. */
|
|
{
|
|
objc_class_tree *new_tree
|
|
= create_tree_of_subclasses_inherited_from (class, tree->class);
|
|
tree->subclasses = list_cons (new_tree, tree->subclasses);
|
|
DEBUG_PRINTF ("5. class %s inserted\n", class->name);
|
|
return tree;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* This function inserts `class' in the right tree hierarchy classes. */
|
|
|
|
static void
|
|
objc_tree_insert_class (Class class)
|
|
{
|
|
struct objc_list *list_node;
|
|
objc_class_tree *tree;
|
|
|
|
list_node = __objc_class_tree_list;
|
|
while (list_node)
|
|
{
|
|
tree = __objc_tree_insert_class (list_node->head, class);
|
|
if (tree)
|
|
{
|
|
list_node->head = tree;
|
|
break;
|
|
}
|
|
else
|
|
list_node = list_node->tail;
|
|
}
|
|
|
|
/* If the list was finished but the class hasn't been inserted,
|
|
insert it here. */
|
|
if (! list_node)
|
|
{
|
|
__objc_class_tree_list = list_cons (NULL, __objc_class_tree_list);
|
|
__objc_class_tree_list->head = __objc_tree_insert_class (NULL, class);
|
|
}
|
|
}
|
|
|
|
/* Traverse tree in preorder. Used to send +load. */
|
|
|
|
static void
|
|
objc_preorder_traverse (objc_class_tree *tree,
|
|
int level,
|
|
void (*function) (objc_class_tree *, int))
|
|
{
|
|
struct objc_list *node;
|
|
|
|
(*function) (tree, level);
|
|
for (node = tree->subclasses; node; node = node->tail)
|
|
objc_preorder_traverse (node->head, level + 1, function);
|
|
}
|
|
|
|
/* Traverse tree in postorder. Used to destroy a tree. */
|
|
|
|
static void
|
|
objc_postorder_traverse (objc_class_tree *tree,
|
|
int level,
|
|
void (*function) (objc_class_tree *, int))
|
|
{
|
|
struct objc_list *node;
|
|
|
|
for (node = tree->subclasses; node; node = node->tail)
|
|
objc_postorder_traverse (node->head, level + 1, function);
|
|
(*function) (tree, level);
|
|
}
|
|
|
|
/* Used to print a tree class hierarchy. */
|
|
|
|
#ifdef DEBUG
|
|
static void
|
|
__objc_tree_print (objc_class_tree *tree, int level)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < level; i++)
|
|
printf (" ");
|
|
printf ("%s\n", tree->class->name);
|
|
}
|
|
#endif
|
|
|
|
/* Walks on a linked list of methods in the reverse order and executes
|
|
all the methods corresponding to `op' selector. Walking in the
|
|
reverse order assures the +load of class is executed first and then
|
|
+load of categories because of the way in which categories are
|
|
added to the class methods. */
|
|
|
|
static void
|
|
__objc_send_message_in_list (MethodList_t method_list, Class class, SEL op)
|
|
{
|
|
int i;
|
|
|
|
if (! method_list)
|
|
return;
|
|
|
|
/* First execute the `op' message in the following method lists */
|
|
__objc_send_message_in_list (method_list->method_next, class, op);
|
|
|
|
/* Search the method list. */
|
|
for (i = 0; i < method_list->method_count; i++)
|
|
{
|
|
Method_t mth = &method_list->method_list[i];
|
|
|
|
if (mth->method_name && sel_eq (mth->method_name, op)
|
|
&& ! hash_is_key_in_hash (__objc_load_methods, mth->method_imp))
|
|
{
|
|
/* Add this method into the +load hash table */
|
|
hash_add (&__objc_load_methods, mth->method_imp, mth->method_imp);
|
|
|
|
DEBUG_PRINTF ("sending +load in class: %s\n", class->name);
|
|
|
|
/* The method was found and wasn't previously executed. */
|
|
(*mth->method_imp) ((id)class, mth->method_name);
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
__objc_send_load (objc_class_tree *tree,
|
|
int level __attribute__ ((__unused__)))
|
|
{
|
|
static SEL load_sel = 0;
|
|
Class class = tree->class;
|
|
MethodList_t method_list = class->class_pointer->methods;
|
|
|
|
if (! load_sel)
|
|
load_sel = sel_register_name ("load");
|
|
|
|
__objc_send_message_in_list (method_list, class, load_sel);
|
|
}
|
|
|
|
static void
|
|
__objc_destroy_class_tree_node (objc_class_tree *tree,
|
|
int level __attribute__ ((__unused__)))
|
|
{
|
|
objc_free (tree);
|
|
}
|
|
|
|
/* This is used to check if the relationship between two classes
|
|
before the runtime completely installs the classes. */
|
|
|
|
static BOOL
|
|
class_is_subclass_of_class (Class class, Class superclass)
|
|
{
|
|
for (; class != Nil;)
|
|
{
|
|
if (class == superclass)
|
|
return YES;
|
|
class = class_superclass_of_class (class);
|
|
}
|
|
|
|
return NO;
|
|
}
|
|
|
|
/* This list contains all the classes in the runtime system for whom
|
|
their superclasses are not yet known to the runtime. */
|
|
static struct objc_list *unresolved_classes = 0;
|
|
|
|
/* Extern function used to reference the Object and NXConstantString
|
|
classes. */
|
|
|
|
extern void __objc_force_linking (void);
|
|
|
|
void
|
|
__objc_force_linking (void)
|
|
{
|
|
extern void __objc_linking (void);
|
|
__objc_linking ();
|
|
}
|
|
|
|
/* Run through the statics list, removing modules as soon as all its
|
|
statics have been initialized. */
|
|
|
|
static void
|
|
objc_init_statics (void)
|
|
{
|
|
struct objc_list **cell = &uninitialized_statics;
|
|
struct objc_static_instances **statics_in_module;
|
|
|
|
objc_mutex_lock (__objc_runtime_mutex);
|
|
|
|
while (*cell)
|
|
{
|
|
int module_initialized = 1;
|
|
|
|
for (statics_in_module = (*cell)->head;
|
|
*statics_in_module; statics_in_module++)
|
|
{
|
|
struct objc_static_instances *statics = *statics_in_module;
|
|
Class class = objc_lookup_class (statics->class_name);
|
|
|
|
if (! class)
|
|
module_initialized = 0;
|
|
/* Actually, the static's class_pointer will be NULL when we
|
|
haven't been here before. However, the comparison is to be
|
|
reminded of taking into account class posing and to think about
|
|
possible semantics... */
|
|
else if (class != statics->instances[0]->class_pointer)
|
|
{
|
|
id *inst;
|
|
|
|
for (inst = &statics->instances[0]; *inst; inst++)
|
|
{
|
|
(*inst)->class_pointer = class;
|
|
|
|
/* ??? Make sure the object will not be freed. With
|
|
refcounting, invoke `-retain'. Without refcounting, do
|
|
nothing and hope that `-free' will never be invoked. */
|
|
|
|
/* ??? Send the object an `-initStatic' or something to
|
|
that effect now or later on? What are the semantics of
|
|
statically allocated instances, besides the trivial
|
|
NXConstantString, anyway? */
|
|
}
|
|
}
|
|
}
|
|
if (module_initialized)
|
|
{
|
|
/* Remove this module from the uninitialized list. */
|
|
struct objc_list *this = *cell;
|
|
*cell = this->tail;
|
|
objc_free (this);
|
|
}
|
|
else
|
|
cell = &(*cell)->tail;
|
|
}
|
|
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
|
} /* objc_init_statics */
|
|
|
|
/* This function is called by constructor functions generated for each
|
|
module compiled. (_GLOBAL_$I$...) The purpose of this function is
|
|
to gather the module pointers so that they may be processed by the
|
|
initialization routines as soon as possible. */
|
|
|
|
void
|
|
__objc_exec_class (Module_t module)
|
|
{
|
|
/* Have we processed any constructors previously? This flag is used to
|
|
indicate that some global data structures need to be built. */
|
|
static BOOL previous_constructors = 0;
|
|
|
|
static struct objc_list *unclaimed_categories = 0;
|
|
|
|
/* The symbol table (defined in objc-api.h) generated by gcc */
|
|
Symtab_t symtab = module->symtab;
|
|
|
|
/* The statics in this module */
|
|
struct objc_static_instances **statics
|
|
= symtab->defs[symtab->cls_def_cnt + symtab->cat_def_cnt];
|
|
|
|
/* Entry used to traverse hash lists */
|
|
struct objc_list **cell;
|
|
|
|
/* The table of selector references for this module */
|
|
SEL selectors = symtab->refs;
|
|
|
|
/* dummy counter */
|
|
int i;
|
|
|
|
DEBUG_PRINTF ("received module: %s\n", module->name);
|
|
|
|
/* check gcc version */
|
|
init_check_module_version (module);
|
|
|
|
/* On the first call of this routine, initialize some data structures. */
|
|
if (! previous_constructors)
|
|
{
|
|
/* Initialize thread-safe system */
|
|
__objc_init_thread_system ();
|
|
__objc_runtime_threads_alive = 1;
|
|
__objc_runtime_mutex = objc_mutex_allocate ();
|
|
|
|
__objc_init_selector_tables ();
|
|
__objc_init_class_tables ();
|
|
__objc_init_dispatch_tables ();
|
|
__objc_class_tree_list = list_cons (NULL, __objc_class_tree_list);
|
|
__objc_load_methods
|
|
= hash_new (128, (hash_func_type)hash_ptr, compare_ptrs);
|
|
previous_constructors = 1;
|
|
}
|
|
|
|
/* Save the module pointer for later processing. (not currently used) */
|
|
objc_mutex_lock (__objc_runtime_mutex);
|
|
__objc_module_list = list_cons (module, __objc_module_list);
|
|
|
|
/* Replace referenced selectors from names to SEL's. */
|
|
if (selectors)
|
|
{
|
|
for (i = 0; selectors[i].sel_id; ++i)
|
|
{
|
|
const char *name, *type;
|
|
name = (char *) selectors[i].sel_id;
|
|
type = (char *) selectors[i].sel_types;
|
|
/* Constructors are constant static data so we can safely store
|
|
pointers to them in the runtime structures. is_const == YES */
|
|
__sel_register_typed_name (name, type,
|
|
(struct objc_selector *) &(selectors[i]),
|
|
YES);
|
|
}
|
|
}
|
|
|
|
/* Parse the classes in the load module and gather selector information. */
|
|
DEBUG_PRINTF ("gathering selectors from module: %s\n", module->name);
|
|
for (i = 0; i < symtab->cls_def_cnt; ++i)
|
|
{
|
|
Class class = (Class) symtab->defs[i];
|
|
const char *superclass = (char *) class->super_class;
|
|
|
|
/* Make sure we have what we think. */
|
|
assert (CLS_ISCLASS (class));
|
|
assert (CLS_ISMETA (class->class_pointer));
|
|
DEBUG_PRINTF ("phase 1, processing class: %s\n", class->name);
|
|
|
|
/* Initialize the subclass list to be NULL.
|
|
In some cases it isn't and this crashes the program. */
|
|
class->subclass_list = NULL;
|
|
|
|
/* Store the class in the class table and assign class numbers. */
|
|
__objc_add_class_to_hash (class);
|
|
|
|
/* Register all of the selectors in the class and meta class. */
|
|
__objc_register_selectors_from_class (class);
|
|
__objc_register_selectors_from_class ((Class) class->class_pointer);
|
|
|
|
/* Install the fake dispatch tables */
|
|
__objc_install_premature_dtable (class);
|
|
__objc_install_premature_dtable (class->class_pointer);
|
|
|
|
/* Register the instance methods as class methods, this is
|
|
only done for root classes. */
|
|
__objc_register_instance_methods_to_class (class);
|
|
|
|
if (class->protocols)
|
|
__objc_init_protocols (class->protocols);
|
|
|
|
/* Check to see if the superclass is known in this point. If it's not
|
|
add the class to the unresolved_classes list. */
|
|
if (superclass && ! objc_lookup_class (superclass))
|
|
unresolved_classes = list_cons (class, unresolved_classes);
|
|
}
|
|
|
|
/* Process category information from the module. */
|
|
for (i = 0; i < symtab->cat_def_cnt; ++i)
|
|
{
|
|
Category_t category = symtab->defs[i + symtab->cls_def_cnt];
|
|
Class class = objc_lookup_class (category->class_name);
|
|
|
|
/* If the class for the category exists then append its methods. */
|
|
if (class)
|
|
{
|
|
|
|
DEBUG_PRINTF ("processing categories from (module,object): %s, %s\n",
|
|
module->name,
|
|
class->name);
|
|
|
|
/* Do instance methods. */
|
|
if (category->instance_methods)
|
|
class_add_method_list (class, category->instance_methods);
|
|
|
|
/* Do class methods. */
|
|
if (category->class_methods)
|
|
class_add_method_list ((Class) class->class_pointer,
|
|
category->class_methods);
|
|
|
|
if (category->protocols)
|
|
{
|
|
__objc_init_protocols (category->protocols);
|
|
__objc_class_add_protocols (class, category->protocols);
|
|
}
|
|
|
|
/* Register the instance methods as class methods, this is
|
|
only done for root classes. */
|
|
__objc_register_instance_methods_to_class (class);
|
|
}
|
|
else
|
|
{
|
|
/* The object to which the category methods belong can't be found.
|
|
Save the information. */
|
|
unclaimed_categories = list_cons (category, unclaimed_categories);
|
|
}
|
|
}
|
|
|
|
if (statics)
|
|
uninitialized_statics = list_cons (statics, uninitialized_statics);
|
|
if (uninitialized_statics)
|
|
objc_init_statics ();
|
|
|
|
/* Scan the unclaimed category hash. Attempt to attach any unclaimed
|
|
categories to objects. */
|
|
for (cell = &unclaimed_categories; *cell; )
|
|
{
|
|
Category_t category = (*cell)->head;
|
|
Class class = objc_lookup_class (category->class_name);
|
|
|
|
if (class)
|
|
{
|
|
DEBUG_PRINTF ("attaching stored categories to object: %s\n",
|
|
class->name);
|
|
|
|
list_remove_head (cell);
|
|
|
|
if (category->instance_methods)
|
|
class_add_method_list (class, category->instance_methods);
|
|
|
|
if (category->class_methods)
|
|
class_add_method_list ((Class) class->class_pointer,
|
|
category->class_methods);
|
|
|
|
if (category->protocols)
|
|
{
|
|
__objc_init_protocols (category->protocols);
|
|
__objc_class_add_protocols (class, category->protocols);
|
|
}
|
|
|
|
/* Register the instance methods as class methods, this is
|
|
only done for root classes. */
|
|
__objc_register_instance_methods_to_class (class);
|
|
}
|
|
else
|
|
cell = &(*cell)->tail;
|
|
}
|
|
|
|
if (unclaimed_proto_list && objc_lookup_class ("Protocol"))
|
|
{
|
|
list_mapcar (unclaimed_proto_list,
|
|
(void (*) (void *))__objc_init_protocols);
|
|
list_free (unclaimed_proto_list);
|
|
unclaimed_proto_list = 0;
|
|
}
|
|
|
|
objc_send_load ();
|
|
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
|
}
|
|
|
|
static void
|
|
objc_send_load (void)
|
|
{
|
|
if (! __objc_module_list)
|
|
return;
|
|
|
|
/* Try to find out if all the classes loaded so far also have their
|
|
superclasses known to the runtime. We suppose that the objects
|
|
that are allocated in the +load method are in general of a class
|
|
declared in the same module. */
|
|
if (unresolved_classes)
|
|
{
|
|
Class class = unresolved_classes->head;
|
|
|
|
while (objc_lookup_class ((char *) class->super_class))
|
|
{
|
|
list_remove_head (&unresolved_classes);
|
|
if (unresolved_classes)
|
|
class = unresolved_classes->head;
|
|
else
|
|
break;
|
|
}
|
|
|
|
/* If we still have classes for whom we don't have yet their
|
|
super classes known to the runtime we don't send the +load
|
|
messages. */
|
|
if (unresolved_classes)
|
|
return;
|
|
}
|
|
|
|
/* Special check to allow creating and sending messages to constant
|
|
strings in +load methods. If these classes are not yet known,
|
|
even if all the other classes are known, delay sending of +load. */
|
|
if (! objc_lookup_class ("NXConstantString") ||
|
|
! objc_lookup_class ("Object"))
|
|
return;
|
|
|
|
/* Iterate over all modules in the __objc_module_list and call on
|
|
them the __objc_create_classes_tree function. This function
|
|
creates a tree of classes that resembles the class hierarchy. */
|
|
list_mapcar (__objc_module_list,
|
|
(void (*) (void *)) __objc_create_classes_tree);
|
|
|
|
while (__objc_class_tree_list)
|
|
{
|
|
#ifdef DEBUG
|
|
objc_preorder_traverse (__objc_class_tree_list->head,
|
|
0, __objc_tree_print);
|
|
#endif
|
|
objc_preorder_traverse (__objc_class_tree_list->head,
|
|
0, __objc_send_load);
|
|
objc_postorder_traverse (__objc_class_tree_list->head,
|
|
0, __objc_destroy_class_tree_node);
|
|
list_remove_head (&__objc_class_tree_list);
|
|
}
|
|
|
|
list_mapcar (__objc_module_list, (void (*) (void *)) __objc_call_callback);
|
|
list_free (__objc_module_list);
|
|
__objc_module_list = NULL;
|
|
}
|
|
|
|
static void
|
|
__objc_create_classes_tree (Module_t module)
|
|
{
|
|
/* The runtime mutex is locked in this point */
|
|
|
|
Symtab_t symtab = module->symtab;
|
|
int i;
|
|
|
|
/* Iterate thru classes defined in this module and insert them in
|
|
the classes tree hierarchy. */
|
|
for (i = 0; i < symtab->cls_def_cnt; i++)
|
|
{
|
|
Class class = (Class) symtab->defs[i];
|
|
|
|
objc_tree_insert_class (class);
|
|
}
|
|
}
|
|
|
|
static void
|
|
__objc_call_callback (Module_t module)
|
|
{
|
|
/* The runtime mutex is locked in this point. */
|
|
|
|
Symtab_t symtab = module->symtab;
|
|
int i;
|
|
|
|
/* Iterate thru classes defined in this module and call the callback
|
|
for each one. */
|
|
for (i = 0; i < symtab->cls_def_cnt; i++)
|
|
{
|
|
Class class = (Class) symtab->defs[i];
|
|
|
|
/* Call the _objc_load_callback for this class. */
|
|
if (_objc_load_callback)
|
|
_objc_load_callback (class, 0);
|
|
}
|
|
|
|
/* Call the _objc_load_callback for categories. Don't register the
|
|
instance methods as class methods for categories to root classes
|
|
since they were already added in the class. */
|
|
for (i = 0; i < symtab->cat_def_cnt; i++)
|
|
{
|
|
Category_t category = symtab->defs[i + symtab->cls_def_cnt];
|
|
Class class = objc_lookup_class (category->class_name);
|
|
|
|
if (_objc_load_callback)
|
|
_objc_load_callback (class, category);
|
|
}
|
|
}
|
|
|
|
/* Sanity check the version of gcc used to compile `module'. */
|
|
|
|
static void
|
|
init_check_module_version (Module_t module)
|
|
{
|
|
if ((module->version != OBJC_VERSION) || (module->size != sizeof (Module)))
|
|
{
|
|
int code;
|
|
|
|
if (module->version > OBJC_VERSION)
|
|
code = OBJC_ERR_OBJC_VERSION;
|
|
else if (module->version < OBJC_VERSION)
|
|
code = OBJC_ERR_GCC_VERSION;
|
|
else
|
|
code = OBJC_ERR_MODULE_SIZE;
|
|
|
|
objc_error (nil, code, "Module %s version %d doesn't match runtime %d\n",
|
|
module->name, (int)module->version, OBJC_VERSION);
|
|
}
|
|
}
|
|
|
|
static void
|
|
__objc_init_protocols (struct objc_protocol_list *protos)
|
|
{
|
|
size_t i;
|
|
static Class proto_class = 0;
|
|
|
|
if (! protos)
|
|
return;
|
|
|
|
objc_mutex_lock (__objc_runtime_mutex);
|
|
|
|
if (! proto_class)
|
|
proto_class = objc_lookup_class ("Protocol");
|
|
|
|
if (! proto_class)
|
|
{
|
|
unclaimed_proto_list = list_cons (protos, unclaimed_proto_list);
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
|
return;
|
|
}
|
|
|
|
#if 0
|
|
assert (protos->next == 0); /* only single ones allowed */
|
|
#endif
|
|
|
|
for (i = 0; i < protos->count; i++)
|
|
{
|
|
struct objc_protocol *aProto = protos->list[i];
|
|
if (((size_t)aProto->class_pointer) == PROTOCOL_VERSION)
|
|
{
|
|
/* assign class pointer */
|
|
aProto->class_pointer = proto_class;
|
|
|
|
/* init super protocols */
|
|
__objc_init_protocols (aProto->protocol_list);
|
|
}
|
|
else if (protos->list[i]->class_pointer != proto_class)
|
|
{
|
|
objc_error (nil, OBJC_ERR_PROTOCOL_VERSION,
|
|
"Version %d doesn't match runtime protocol version %d\n",
|
|
(int) ((char *) protos->list[i]->class_pointer
|
|
- (char *) 0),
|
|
PROTOCOL_VERSION);
|
|
}
|
|
}
|
|
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
|
}
|
|
|
|
static void
|
|
__objc_class_add_protocols (Class class, struct objc_protocol_list *protos)
|
|
{
|
|
/* Well... */
|
|
if (! protos)
|
|
return;
|
|
|
|
/* Add it... */
|
|
protos->next = class->protocols;
|
|
class->protocols = protos;
|
|
}
|