/* GNU Objective C Runtime message lookup
Copyright (C) 1993, 1995, 1996, 1997, 1998,
- 2001 Free Software Foundation, Inc.
+ 2001, 2002, 2004, 2009, 2010 Free Software Foundation, Inc.
Contributed by Kresten Krab Thorup
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC is free software; you can redistribute it and/or modify it under the
+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.
+Foundation; either version 3, or (at your option) any later version.
-GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
+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
-GNU CC; see the file COPYING. If not, write to the Free Software
-Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
-/* 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. */
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
+/* Uncommented the following line to enable debug logging. Use this
+ only while debugging the runtime. */
+/* #define DEBUG 1 */
+
+/* FIXME: This file has no business including tm.h. */
+/* FIXME: This should be using libffi instead of __builtin_apply
+ and friends. */
+
+#include "objc-private/common.h"
+#include "objc-private/error.h"
#include "tconfig.h"
-#include "runtime.h"
-#include "sarray.h"
-#include "encoding.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "objc/runtime.h"
+#include "objc/message.h" /* For objc_msg_lookup(), objc_msg_lookup_super(). */
+#include "objc/thr.h"
+#include "objc-private/module-abi-8.h"
+#include "objc-private/runtime.h"
+#include "objc-private/sarray.h"
+#include "objc-private/selector.h" /* For sel_is_mapped() */
#include "runtime-info.h"
+#include <assert.h> /* For assert */
+#include <string.h> /* For strlen */
-/* this is how we hack STRUCT_VALUE to be 1 or 0 */
+/* This is how we hack STRUCT_VALUE to be 1 or 0. */
#define gen_rtx(args...) 1
#define gen_rtx_MEM(args...) 1
#define gen_rtx_REG(args...) 1
+/* Already defined in gcc/coretypes.h. So prevent double definition warning. */
+#undef rtx
#define rtx int
-#if !defined(STRUCT_VALUE) || STRUCT_VALUE == 0
+#if ! defined (STRUCT_VALUE) || STRUCT_VALUE == 0
#define INVISIBLE_STRUCT_RETURN 1
#else
#define INVISIBLE_STRUCT_RETURN 0
#endif
-/* The uninstalled dispatch table */
-struct sarray* __objc_uninstalled_dtable = 0; /* !T:MUTEX */
+/* The uninstalled dispatch table. */
+struct sarray *__objc_uninstalled_dtable = 0; /* !T:MUTEX */
-/* Hook for method forwarding. If it is set, is invoked to return a
- function that performs the real forwarding. Otherwise the libgcc
- based functions (__builtin_apply and friends) are used. */
-IMP (*__objc_msg_forward)(SEL) = NULL;
+/* Two hooks for method forwarding. If either is set, it is invoked to
+ * return a function that performs the real forwarding. If both are
+ * set, the result of __objc_msg_forward2 will be preferred over that
+ * of __objc_msg_forward. If both return NULL or are unset, the
+ * libgcc based functions (__builtin_apply and friends) are used. */
+IMP (*__objc_msg_forward) (SEL) = NULL;
+IMP (*__objc_msg_forward2) (id, SEL) = NULL;
-/* Send +initialize to class */
-static void __objc_send_initialize(Class);
+/* Send +initialize to class. */
+static void __objc_send_initialize (Class);
static void __objc_install_dispatch_table_for_class (Class);
-/* Forward declare some functions */
-static void __objc_init_install_dtable(id, SEL);
+/* Forward declare some functions. */
+static void __objc_init_install_dtable (id, SEL);
/* Various forwarding functions that are used based upon the
return type for the selector.
__objc_block_forward for structures.
__objc_double_forward for floats/doubles.
- __objc_word_forward for pointers or types that fit in registers.
- */
-static double __objc_double_forward(id, SEL, ...);
-static id __objc_word_forward(id, SEL, ...);
+ __objc_word_forward for pointers or types that fit in registers. */
+static double __objc_double_forward (id, SEL, ...);
+static id __objc_word_forward (id, SEL, ...);
typedef struct { id many[8]; } __big;
#if INVISIBLE_STRUCT_RETURN
static __big
#else
static id
#endif
-__objc_block_forward(id, SEL, ...);
-static Method_t search_for_method_in_hierarchy (Class class, SEL sel);
-Method_t search_for_method_in_list(MethodList_t list, SEL op);
-id nil_method(id, SEL, ...);
+__objc_block_forward (id, SEL, ...);
+static struct objc_method * search_for_method_in_hierarchy (Class class, SEL sel);
+struct objc_method * search_for_method_in_list (struct objc_method_list * list, SEL op);
+id nil_method (id, SEL);
/* Given a selector, return the proper forwarding implementation. */
-__inline__
-IMP
-__objc_get_forward_imp (SEL sel)
-{
- /* If a custom forwarding hook was registered, try getting a forwarding
- * function from it. */
- if (__objc_msg_forward)
- {
- IMP result;
+inline
+IMP
+__objc_get_forward_imp (id rcv, SEL sel)
+{
+ /* If a custom forwarding hook was registered, try getting a
+ forwarding function from it. There are two forward routine hooks,
+ one that takes the receiver as an argument and one that does
+ not. */
+ if (__objc_msg_forward2)
+ {
+ IMP result;
+ if ((result = __objc_msg_forward2 (rcv, sel)) != NULL)
+ return result;
+ }
+ if (__objc_msg_forward)
+ {
+ IMP result;
if ((result = __objc_msg_forward (sel)) != NULL)
- return result;
- }
-
- /* In all other cases, use the default forwarding functions built using
- * __builtin_apply and friends. */
- {
- const char *t = sel->sel_types;
-
- if (t && (*t == '[' || *t == '(' || *t == '{')
-#ifdef OBJC_MAX_STRUCT_BY_VALUE
- && objc_sizeof_type(t) > OBJC_MAX_STRUCT_BY_VALUE
-#endif
- )
- return (IMP)__objc_block_forward;
- else if (t && (*t == 'f' || *t == 'd'))
- return (IMP)__objc_double_forward;
- else
- return (IMP)__objc_word_forward;
- }
-}
-
-/* Given a class and selector, return the selector's implementation. */
-__inline__
+ return result;
+ }
+
+ /* In all other cases, use the default forwarding functions built
+ using __builtin_apply and friends. */
+ {
+ const char *t = sel->sel_types;
+
+ if (t && (*t == '[' || *t == '(' || *t == '{')
+#ifdef OBJC_MAX_STRUCT_BY_VALUE
+ && objc_sizeof_type (t) > OBJC_MAX_STRUCT_BY_VALUE
+#endif
+ )
+ return (IMP)__objc_block_forward;
+ else if (t && (*t == 'f' || *t == 'd'))
+ return (IMP)__objc_double_forward;
+ else
+ return (IMP)__objc_word_forward;
+ }
+}
+
+/* Selectors for +resolveClassMethod: and +resolveInstanceMethod:.
+ These are set up at startup. */
+static SEL selector_resolveClassMethod = NULL;
+static SEL selector_resolveInstanceMethod = NULL;
+
+/* Internal routines use to resolve a class method using
+ +resolveClassMethod:. 'class' is always a non-Nil class (*not* a
+ meta-class), and 'sel' is the selector that we are trying to
+ resolve. This must be called when class is not Nil, and the
+ dispatch table for class methods has already been installed.
+
+ This routine tries to call +resolveClassMethod: to give an
+ opportunity to resolve the method. If +resolveClassMethod: returns
+ YES, it tries looking up the method again, and if found, it returns
+ it. Else, it returns NULL. */
+static inline
+IMP
+__objc_resolve_class_method (Class class, SEL sel)
+{
+ /* We need to lookup +resolveClassMethod:. */
+ BOOL (*resolveMethodIMP) (id, SEL, SEL);
+
+ /* The dispatch table for class methods is already installed and we
+ don't want any forwarding to happen when looking up this method,
+ so we just look it up directly. Note that if 'sel' is precisely
+ +resolveClassMethod:, this would look it up yet again and find
+ nothing. That's no problem and there's no recursion. */
+ resolveMethodIMP = (BOOL (*) (id, SEL, SEL))sarray_get_safe
+ (class->class_pointer->dtable, (size_t) selector_resolveClassMethod->sel_id);
+
+ if (resolveMethodIMP && resolveMethodIMP ((id)class, selector_resolveClassMethod, sel))
+ {
+ /* +resolveClassMethod: returned YES. Look the method up again.
+ We already know the dtable is installed. */
+
+ /* TODO: There is the case where +resolveClassMethod: is buggy
+ and returned YES without actually adding the method. We
+ could maybe print an error message. */
+ return sarray_get_safe (class->class_pointer->dtable, (size_t) sel->sel_id);
+ }
+
+ return NULL;
+}
+
+/* Internal routines use to resolve a instance method using
+ +resolveInstanceMethod:. 'class' is always a non-Nil class, and
+ 'sel' is the selector that we are trying to resolve. This must be
+ called when class is not Nil, and the dispatch table for instance
+ methods has already been installed.
+
+ This routine tries to call +resolveInstanceMethod: to give an
+ opportunity to resolve the method. If +resolveInstanceMethod:
+ returns YES, it tries looking up the method again, and if found, it
+ returns it. Else, it returns NULL. */
+static inline
+IMP
+__objc_resolve_instance_method (Class class, SEL sel)
+{
+ /* We need to lookup +resolveInstanceMethod:. */
+ BOOL (*resolveMethodIMP) (id, SEL, SEL);
+
+ /* The dispatch table for class methods may not be already installed
+ so we have to install it if needed. */
+ resolveMethodIMP = sarray_get_safe (class->class_pointer->dtable,
+ (size_t) selector_resolveInstanceMethod->sel_id);
+ if (resolveMethodIMP == 0)
+ {
+ /* Try again after installing the dtable. */
+ if (class->class_pointer->dtable == __objc_uninstalled_dtable)
+ {
+ objc_mutex_lock (__objc_runtime_mutex);
+ if (class->class_pointer->dtable == __objc_uninstalled_dtable)
+ __objc_install_dispatch_table_for_class (class->class_pointer);
+ objc_mutex_unlock (__objc_runtime_mutex);
+ }
+ resolveMethodIMP = sarray_get_safe (class->class_pointer->dtable,
+ (size_t) selector_resolveInstanceMethod->sel_id);
+ }
+
+ if (resolveMethodIMP && resolveMethodIMP ((id)class, selector_resolveInstanceMethod, sel))
+ {
+ /* +resolveInstanceMethod: returned YES. Look the method up
+ again. We already know the dtable is installed. */
+
+ /* TODO: There is the case where +resolveInstanceMethod: is
+ buggy and returned YES without actually adding the method.
+ We could maybe print an error message. */
+ return sarray_get_safe (class->dtable, (size_t) sel->sel_id);
+ }
+
+ return NULL;
+}
+
+/* Given a class and selector, return the selector's
+ implementation. */
+inline
IMP
get_imp (Class class, SEL sel)
{
- void* res = sarray_get_safe (class->dtable, (size_t) sel->sel_id);
+ /* In a vanilla implementation we would first check if the dispatch
+ table is installed. Here instead, to get more speed in the
+ standard case (that the dispatch table is installed) we first try
+ to get the imp using brute force. Only if that fails, we do what
+ we should have been doing from the very beginning, that is, check
+ if the dispatch table needs to be installed, install it if it's
+ not installed, and retrieve the imp from the table if it's
+ installed. */
+ void *res = sarray_get_safe (class->dtable, (size_t) sel->sel_id);
if (res == 0)
{
- /* Not a valid method */
- if(class->dtable == __objc_uninstalled_dtable)
+ /* Not a valid method. */
+ if (class->dtable == __objc_uninstalled_dtable)
{
- /* The dispatch table needs to be installed. */
- objc_mutex_lock(__objc_runtime_mutex);
- __objc_install_dispatch_table_for_class (class);
- objc_mutex_unlock(__objc_runtime_mutex);
- /* Call ourselves with the installed dispatch table
- and get the real method */
- res = get_imp(class, sel);
+ /* The dispatch table needs to be installed. */
+ objc_mutex_lock (__objc_runtime_mutex);
+
+ /* Double-checked locking pattern: Check
+ __objc_uninstalled_dtable again in case another thread
+ installed the dtable while we were waiting for the lock
+ to be released. */
+ if (class->dtable == __objc_uninstalled_dtable)
+ {
+ __objc_install_dispatch_table_for_class (class);
+ }
+
+ objc_mutex_unlock (__objc_runtime_mutex);
+ /* Call ourselves with the installed dispatch table and get
+ the real method. */
+ res = get_imp (class, sel);
}
else
{
- /* The dispatch table has been installed so the
- method just doesn't exist for the class.
- Return the forwarding implementation. */
- res = __objc_get_forward_imp(sel);
+ /* The dispatch table has been installed. */
+
+ /* Get the method from the dispatch table (we try to get it
+ again in case another thread has installed the dtable just
+ after we invoked sarray_get_safe, but before we checked
+ class->dtable == __objc_uninstalled_dtable). */
+ res = sarray_get_safe (class->dtable, (size_t) sel->sel_id);
+ if (res == 0)
+ {
+ /* The dispatch table has been installed, and the method
+ is not in the dispatch table. So the method just
+ doesn't exist for the class. */
+
+ /* Try going through the +resolveClassMethod: or
+ +resolveInstanceMethod: process. */
+ if (CLS_ISMETA (class))
+ {
+ /* We have the meta class, but we need to invoke the
+ +resolveClassMethod: method on the class. So, we
+ need to obtain the class from the meta class,
+ which we do using the fact that both the class
+ and the meta-class have the same name. */
+ Class realClass = objc_lookUpClass (class->name);
+ if (realClass)
+ res = __objc_resolve_class_method (realClass, sel);
+ }
+ else
+ res = __objc_resolve_instance_method (class, sel);
+
+ if (res == 0)
+ {
+ /* If that fails, then return the forwarding
+ implementation. We don't know the receiver (only
+ its class), so we have to pass 'nil' as the first
+ argument. Passing the class as first argument is
+ wrong because the class is not the receiver; it
+ can result in us calling a class method when we
+ want an instance method of the same name. */
+ res = __objc_get_forward_imp (nil, sel);
+ }
+ }
}
}
return res;
}
+/* The new name of get_imp(). */
+IMP
+class_getMethodImplementation (Class class_, SEL selector)
+{
+ if (class_ == Nil || selector == NULL)
+ return NULL;
+
+ /* get_imp is inlined, so we're good. */
+ return get_imp (class_, selector);
+}
+
+/* Given a method, return its implementation. This has been replaced
+ by method_getImplementation() in the modern API. */
+IMP
+method_get_imp (struct objc_method * method)
+{
+ return (method != (struct objc_method *)0) ? method->method_imp : (IMP)0;
+}
+
/* Query if an object can respond to a selector, returns YES if the
-object implements the selector otherwise NO. Does not check if the
-method can be forwarded. */
-__inline__
+ object implements the selector otherwise NO. Does not check if the
+ method can be forwarded. */
+inline
BOOL
__objc_responds_to (id object, SEL sel)
{
- void* res;
+ void *res;
- /* Install dispatch table if need be */
+ /* Install dispatch table if need be. */
if (object->class_pointer->dtable == __objc_uninstalled_dtable)
{
- objc_mutex_lock(__objc_runtime_mutex);
- __objc_install_dispatch_table_for_class (object->class_pointer);
- objc_mutex_unlock(__objc_runtime_mutex);
+ objc_mutex_lock (__objc_runtime_mutex);
+ if (object->class_pointer->dtable == __objc_uninstalled_dtable)
+ {
+ __objc_install_dispatch_table_for_class (object->class_pointer);
+ }
+ objc_mutex_unlock (__objc_runtime_mutex);
}
- /* Get the method from the dispatch table */
+ /* Get the method from the dispatch table. */
res = sarray_get_safe (object->class_pointer->dtable, (size_t) sel->sel_id);
return (res != 0);
}
-/* This is the lookup function. All entries in the table are either a
+BOOL
+class_respondsToSelector (Class class_, SEL selector)
+{
+ void *res;
+
+ if (class_ == Nil || selector == NULL)
+ return NO;
+
+ /* Install dispatch table if need be. */
+ if (class_->dtable == __objc_uninstalled_dtable)
+ {
+ objc_mutex_lock (__objc_runtime_mutex);
+ if (class_->dtable == __objc_uninstalled_dtable)
+ {
+ __objc_install_dispatch_table_for_class (class_);
+ }
+ objc_mutex_unlock (__objc_runtime_mutex);
+ }
+
+ /* Get the method from the dispatch table. */
+ res = sarray_get_safe (class_->dtable, (size_t) selector->sel_id);
+ return (res != 0);
+}
+
+/* This is the lookup function. All entries in the table are either a
valid method *or* zero. If zero then either the dispatch table
- needs to be installed or it doesn't exist and forwarding is attempted. */
-__inline__
+ needs to be installed or it doesn't exist and forwarding is
+ attempted. */
IMP
-objc_msg_lookup(id receiver, SEL op)
+objc_msg_lookup (id receiver, SEL op)
{
IMP result;
- if(receiver)
+ if (receiver)
{
result = sarray_get_safe (receiver->class_pointer->dtable,
(sidx)op->sel_id);
if (result == 0)
{
- /* Not a valid method */
- if(receiver->class_pointer->dtable == __objc_uninstalled_dtable)
+ /* Not a valid method. */
+ if (receiver->class_pointer->dtable == __objc_uninstalled_dtable)
{
- /* The dispatch table needs to be installed.
- This happens on the very first method call to the class. */
- __objc_init_install_dtable(receiver, op);
-
- /* Get real method for this in newly installed dtable */
- result = get_imp(receiver->class_pointer, op);
+ /* The dispatch table needs to be installed. This
+ happens on the very first method call to the
+ class. */
+ __objc_init_install_dtable (receiver, op);
+
+ /* Get real method for this in newly installed
+ dtable. */
+ result = get_imp (receiver->class_pointer, op);
}
else
{
- /* The dispatch table has been installed so the
- method just doesn't exist for the class.
- Attempt to forward the method. */
- result = __objc_get_forward_imp(op);
+ /* The dispatch table has been installed. Check again
+ if the method exists (just in case the dispatch table
+ has been installed by another thread after we did the
+ previous check that the method exists). */
+ result = sarray_get_safe (receiver->class_pointer->dtable,
+ (sidx)op->sel_id);
+ if (result == 0)
+ {
+ /* Try going through the +resolveClassMethod: or
+ +resolveInstanceMethod: process. */
+ if (CLS_ISMETA (receiver->class_pointer))
+ result = __objc_resolve_class_method ((Class)receiver, op);
+ else
+ result = __objc_resolve_instance_method (receiver->class_pointer,
+ op);
+
+ if (result == 0)
+ {
+ /* If the method still just doesn't exist for
+ the class, attempt to forward the method. */
+ result = __objc_get_forward_imp (receiver, op);
+ }
+ }
}
}
return result;
}
else
- return nil_method;
+ return (IMP)nil_method;
}
IMP
-objc_msg_lookup_super (Super_t super, SEL sel)
+objc_msg_lookup_super (struct objc_super *super, SEL sel)
{
if (super->self)
- return get_imp (super->class, sel);
+ return get_imp (super->super_class, sel);
else
- return nil_method;
+ return (IMP)nil_method;
}
-int method_get_sizeof_arguments (Method*);
+/* Temporarily defined here until objc_msg_sendv() goes away. */
+char *method_get_first_argument (struct objc_method *,
+ arglist_t argframe,
+ const char **type);
+char *method_get_next_argument (arglist_t argframe,
+ const char **type);
+int method_get_sizeof_arguments (struct objc_method *);
+
+struct objc_method *
+class_get_instance_method (Class class, SEL op);
retval_t
-objc_msg_sendv(id object, SEL op, arglist_t arg_frame)
+objc_msg_sendv (id object, SEL op, arglist_t arg_frame)
{
- Method* m = class_get_instance_method(object->class_pointer, op);
+ struct objc_method *m = class_get_instance_method (object->class_pointer, op);
const char *type;
- *((id*)method_get_first_argument (m, arg_frame, &type)) = object;
- *((SEL*)method_get_next_argument (arg_frame, &type)) = op;
- return __builtin_apply((apply_t)m->method_imp,
- arg_frame,
- method_get_sizeof_arguments (m));
+ *((id *) method_get_first_argument (m, arg_frame, &type)) = object;
+ *((SEL *) method_get_next_argument (arg_frame, &type)) = op;
+ return __builtin_apply ((apply_t) m->method_imp,
+ arg_frame,
+ method_get_sizeof_arguments (m));
}
void
-__objc_init_dispatch_tables()
+__objc_init_dispatch_tables ()
{
- __objc_uninstalled_dtable
- = sarray_new(200, 0);
+ __objc_uninstalled_dtable = sarray_new (200, 0);
+
+ /* TODO: It would be cool to register typed selectors here. */
+ selector_resolveClassMethod = sel_registerName ("resolveClassMethod:");
+ selector_resolveInstanceMethod =sel_registerName ("resolveInstanceMethod:");
}
-/* This function is called by objc_msg_lookup when the
- dispatch table needs to be installed; thus it is called once
- for each class, namely when the very first message is sent to it. */
+/* This function is called by objc_msg_lookup when the dispatch table
+ needs to be installed; thus it is called once for each class,
+ namely when the very first message is sent to it. */
static void
-__objc_init_install_dtable(id receiver, SEL op __attribute__ ((__unused__)))
+__objc_init_install_dtable (id receiver, SEL op __attribute__ ((__unused__)))
{
- /* This may happen, if the programmer has taken the address of a
- method before the dtable was initialized... too bad for him! */
- if(receiver->class_pointer->dtable != __objc_uninstalled_dtable)
- return;
-
- objc_mutex_lock(__objc_runtime_mutex);
-
- if(CLS_ISCLASS(receiver->class_pointer))
+ objc_mutex_lock (__objc_runtime_mutex);
+
+ /* This may happen, if the programmer has taken the address of a
+ method before the dtable was initialized... too bad for him! */
+ if (receiver->class_pointer->dtable != __objc_uninstalled_dtable)
{
- /* receiver is an ordinary object */
- assert(CLS_ISCLASS(receiver->class_pointer));
+ objc_mutex_unlock (__objc_runtime_mutex);
+ return;
+ }
+
+ if (CLS_ISCLASS (receiver->class_pointer))
+ {
+ /* receiver is an ordinary object. */
+ assert (CLS_ISCLASS (receiver->class_pointer));
- /* install instance methods table */
+ /* Install instance methods table. */
__objc_install_dispatch_table_for_class (receiver->class_pointer);
- /* call +initialize -- this will in turn install the factory
- dispatch table if not already done :-) */
- __objc_send_initialize(receiver->class_pointer);
+ /* Call +initialize -- this will in turn install the factory
+ dispatch table if not already done. :-) */
+ __objc_send_initialize (receiver->class_pointer);
}
else
{
- /* receiver is a class object */
- assert(CLS_ISCLASS((Class)receiver));
- assert(CLS_ISMETA(receiver->class_pointer));
+ /* receiver is a class object. */
+ assert (CLS_ISCLASS ((Class)receiver));
+ assert (CLS_ISMETA (receiver->class_pointer));
- /* Install real dtable for factory methods */
+ /* Install real dtable for factory methods. */
__objc_install_dispatch_table_for_class (receiver->class_pointer);
- __objc_send_initialize((Class)receiver);
+ __objc_send_initialize ((Class)receiver);
}
- objc_mutex_unlock(__objc_runtime_mutex);
+ objc_mutex_unlock (__objc_runtime_mutex);
}
/* Install dummy table for class which causes the first message to
- that class (or instances hereof) to be initialized properly */
+ that class (or instances hereof) to be initialized properly. */
void
-__objc_install_premature_dtable(Class class)
+__objc_install_premature_dtable (Class class)
{
- assert(__objc_uninstalled_dtable);
+ assert (__objc_uninstalled_dtable);
class->dtable = __objc_uninstalled_dtable;
}
-/* Send +initialize to class if not already done */
+/* Send +initialize to class if not already done. */
static void
-__objc_send_initialize(Class class)
+__objc_send_initialize (Class class)
{
- /* This *must* be a class object */
- assert(CLS_ISCLASS(class));
- assert(!CLS_ISMETA(class));
+ /* This *must* be a class object. */
+ assert (CLS_ISCLASS (class));
+ assert (! CLS_ISMETA (class));
- if (!CLS_ISINITIALIZED(class))
+ if (! CLS_ISINITIALIZED (class))
{
- CLS_SETINITIALIZED(class);
- CLS_SETINITIALIZED(class->class_pointer);
+ DEBUG_PRINTF ("+initialize: need to initialize class '%s'\n", class->name);
+ CLS_SETINITIALIZED (class);
+ CLS_SETINITIALIZED (class->class_pointer);
- /* Create the garbage collector type memory description */
+ /* Create the garbage collector type memory description. */
__objc_generate_gc_type_description (class);
- if(class->super_class)
- __objc_send_initialize(class->super_class);
+ if (class->super_class)
+ __objc_send_initialize (class->super_class);
{
- SEL op = sel_register_name ("initialize");
- IMP imp = 0;
- MethodList_t method_list = class->class_pointer->methods;
-
- while (method_list) {
- int i;
- Method_t method;
-
- for (i = 0; i< method_list->method_count; i++) {
- method = &(method_list->method_list[i]);
- if (method->method_name
- && method->method_name->sel_id == op->sel_id) {
- imp = method->method_imp;
- break;
- }
- }
-
- if (imp)
- break;
-
- method_list = method_list->method_next;
-
- }
+ SEL op = sel_registerName ("initialize");
+ IMP imp = 0;
+ struct objc_method_list * method_list = class->class_pointer->methods;
+
+ while (method_list)
+ {
+ int i;
+ struct objc_method * method;
+
+ for (i = 0; i < method_list->method_count; i++)
+ {
+ method = &(method_list->method_list[i]);
+ if (method->method_name
+ && method->method_name->sel_id == op->sel_id)
+ {
+ imp = method->method_imp;
+ break;
+ }
+ }
+
+ if (imp)
+ break;
+
+ method_list = method_list->method_next;
+ }
if (imp)
- (*imp)((id)class, op);
-
+ {
+ DEBUG_PRINTF (" begin of [%s +initialize]\n", class->name);
+ (*imp) ((id) class, op);
+ DEBUG_PRINTF (" end of [%s +initialize]\n", class->name);
+ }
+#ifdef DEBUG
+ else
+ {
+ DEBUG_PRINTF (" class '%s' has no +initialize method\n", class->name);
+ }
+#endif
}
}
}
-/* Walk on the methods list of class and install the methods in the reverse
- order of the lists. Since methods added by categories are before the methods
- of class in the methods list, this allows categories to substitute methods
- declared in class. However if more than one category replaces the same
- method nothing is guaranteed about what method will be used.
- Assumes that __objc_runtime_mutex is locked down. */
+/* Walk on the methods list of class and install the methods in the
+ reverse order of the lists. Since methods added by categories are
+ before the methods of class in the methods list, this allows
+ categories to substitute methods declared in class. However if
+ more than one category replaces the same method nothing is
+ guaranteed about what method will be used. Assumes that
+ __objc_runtime_mutex is locked down. */
static void
-__objc_install_methods_in_dtable (Class class, MethodList_t method_list)
+__objc_install_methods_in_dtable (Class class, struct objc_method_list * method_list)
{
int i;
-
- if (!method_list)
+
+ if (! method_list)
return;
-
+
if (method_list->method_next)
__objc_install_methods_in_dtable (class, method_list->method_next);
-
+
for (i = 0; i < method_list->method_count; i++)
{
- Method_t method = &(method_list->method_list[i]);
+ struct objc_method * method = &(method_list->method_list[i]);
sarray_at_put_safe (class->dtable,
(sidx) method->method_name->sel_id,
method->method_imp);
}
}
-/* Assumes that __objc_runtime_mutex is locked down. */
+/* Assumes that __objc_runtime_mutex is locked down. */
static void
__objc_install_dispatch_table_for_class (Class class)
{
Class super;
- /* If the class has not yet had its class links resolved, we must
- re-compute all class links */
- if(!CLS_ISRESOLV(class))
- __objc_resolve_class_links();
+ /* If the class has not yet had its class links resolved, we must
+ re-compute all class links. */
+ if (! CLS_ISRESOLV (class))
+ __objc_resolve_class_links ();
+ DEBUG_PRINTF ("__objc_install_dispatch_table_for_class (%s)\n", class->name);
+
super = class->super_class;
if (super != 0 && (super->dtable == __objc_uninstalled_dtable))
__objc_install_dispatch_table_for_class (super);
- /* Allocate dtable if necessary */
+ /* Allocate dtable if necessary. */
if (super == 0)
{
- objc_mutex_lock(__objc_runtime_mutex);
+ objc_mutex_lock (__objc_runtime_mutex);
class->dtable = sarray_new (__objc_selector_max_index, 0);
- objc_mutex_unlock(__objc_runtime_mutex);
+ objc_mutex_unlock (__objc_runtime_mutex);
}
else
class->dtable = sarray_lazy_copy (super->dtable);
Class next;
struct sarray *arr;
- /* not yet installed -- skip it */
+ /* Not yet installed -- skip it. */
if (class->dtable == __objc_uninstalled_dtable)
return;
- objc_mutex_lock(__objc_runtime_mutex);
+ DEBUG_PRINTF (" _objc_update_dispatch_table_for_class (%s)\n", class->name);
+
+ objc_mutex_lock (__objc_runtime_mutex);
arr = class->dtable;
__objc_install_premature_dtable (class); /* someone might require it... */
sarray_free (arr); /* release memory */
-
- /* could have been lazy... */
+
+ /* Could have been lazy... */
__objc_install_dispatch_table_for_class (class);
- if (class->subclass_list) /* Traverse subclasses */
+ if (class->subclass_list) /* Traverse subclasses. */
for (next = class->subclass_list; next; next = next->sibling_class)
__objc_update_dispatch_table_for_class (next);
- objc_mutex_unlock(__objc_runtime_mutex);
+ objc_mutex_unlock (__objc_runtime_mutex);
}
-
/* This function adds a method list to a class. This function is
typically called by another function specific to the run-time. As
such this function does not worry about thread safe issues.
This one is only called for categories. Class objects have their
methods installed right away, and their selectors are made into
- SEL's by the function __objc_register_selectors_from_class. */
+ SEL's by the function __objc_register_selectors_from_class. */
void
-class_add_method_list (Class class, MethodList_t list)
+class_add_method_list (Class class, struct objc_method_list * list)
{
- int i;
-
/* Passing of a linked list is not allowed. Do multiple calls. */
- assert (!list->method_next);
+ assert (! list->method_next);
- /* Check for duplicates. */
- for (i = 0; i < list->method_count; ++i)
- {
- Method_t method = &list->method_list[i];
-
- if (method->method_name) /* Sometimes these are NULL */
- {
- /* This is where selector names are transmogrified to SEL's */
- method->method_name =
- sel_register_typed_name ((const char*)method->method_name,
- method->method_types);
- }
- }
+ __objc_register_selectors_from_list(list);
/* Add the methods to the class's method list. */
list->method_next = class->methods;
class->methods = list;
- /* Update the dispatch table of class */
+ /* Update the dispatch table of class. */
__objc_update_dispatch_table_for_class (class);
}
-Method_t
-class_get_instance_method(Class class, SEL op)
+struct objc_method *
+class_get_instance_method (Class class, SEL op)
{
- return search_for_method_in_hierarchy(class, op);
+ return search_for_method_in_hierarchy (class, op);
}
-Method_t
-class_get_class_method(MetaClass class, SEL op)
+struct objc_method *
+class_get_class_method (MetaClass class, SEL op)
{
- return search_for_method_in_hierarchy(class, op);
+ return search_for_method_in_hierarchy (class, op);
}
+struct objc_method *
+class_getInstanceMethod (Class class_, SEL selector)
+{
+ struct objc_method *m;
+
+ if (class_ == Nil || selector == NULL)
+ return NULL;
+
+ m = search_for_method_in_hierarchy (class_, selector);
+ if (m)
+ return m;
-/* Search for a method starting from the current class up its hierarchy.
- Return a pointer to the method's method structure if found. NULL
- otherwise. */
+ /* Try going through +resolveInstanceMethod:, and do the search
+ again if successful. */
+ if (__objc_resolve_instance_method (class_, selector))
+ return search_for_method_in_hierarchy (class_, selector);
+
+ return NULL;
+}
+
+struct objc_method *
+class_getClassMethod (Class class_, SEL selector)
+{
+ struct objc_method *m;
-static Method_t
+ if (class_ == Nil || selector == NULL)
+ return NULL;
+
+ m = search_for_method_in_hierarchy (class_->class_pointer,
+ selector);
+ if (m)
+ return m;
+
+ /* Try going through +resolveClassMethod:, and do the search again
+ if successful. */
+ if (__objc_resolve_class_method (class_, selector))
+ return search_for_method_in_hierarchy (class_->class_pointer,
+ selector);
+
+ return NULL;
+}
+
+BOOL
+class_addMethod (Class class_, SEL selector, IMP implementation,
+ const char *method_types)
+{
+ struct objc_method_list *method_list;
+ struct objc_method *method;
+ const char *method_name;
+
+ if (class_ == Nil || selector == NULL || implementation == NULL
+ || method_types == NULL || (strcmp (method_types, "") == 0))
+ return NO;
+
+ method_name = sel_getName (selector);
+ if (method_name == NULL)
+ return NO;
+
+ /* If the method already exists in the class, return NO. It is fine
+ if the method already exists in the superclass; in that case, we
+ are overriding it. */
+ if (CLS_IS_IN_CONSTRUCTION (class_))
+ {
+ /* The class only contains a list of methods; they have not been
+ registered yet, ie, the method_name of each of them is still
+ a string, not a selector. Iterate manually over them to
+ check if we have already added the method. */
+ struct objc_method_list * method_list = class_->methods;
+ while (method_list)
+ {
+ int i;
+
+ /* Search the method list. */
+ for (i = 0; i < method_list->method_count; ++i)
+ {
+ struct objc_method * method = &method_list->method_list[i];
+
+ if (method->method_name
+ && strcmp ((char *)method->method_name, method_name) == 0)
+ return NO;
+ }
+
+ /* The method wasn't found. Follow the link to the next list of
+ methods. */
+ method_list = method_list->method_next;
+ }
+ /* The method wasn't found. It's a new one. Go ahead and add
+ it. */
+ }
+ else
+ {
+ /* Do the standard lookup. This assumes the selectors are
+ mapped. */
+ if (search_for_method_in_list (class_->methods, selector))
+ return NO;
+ }
+
+ method_list = (struct objc_method_list *)objc_calloc (1, sizeof (struct objc_method_list));
+ method_list->method_count = 1;
+
+ method = &(method_list->method_list[0]);
+ method->method_name = objc_malloc (strlen (method_name) + 1);
+ strcpy ((char *)method->method_name, method_name);
+
+ method->method_types = objc_malloc (strlen (method_types) + 1);
+ strcpy ((char *)method->method_types, method_types);
+
+ method->method_imp = implementation;
+
+ if (CLS_IS_IN_CONSTRUCTION (class_))
+ {
+ /* We only need to add the method to the list. It will be
+ registered with the runtime when the class pair is registered
+ (if ever). */
+ method_list->method_next = class_->methods;
+ class_->methods = method_list;
+ }
+ else
+ {
+ /* Add the method to a live class. */
+ objc_mutex_lock (__objc_runtime_mutex);
+ class_add_method_list (class_, method_list);
+ objc_mutex_unlock (__objc_runtime_mutex);
+ }
+
+ return YES;
+}
+
+IMP
+class_replaceMethod (Class class_, SEL selector, IMP implementation,
+ const char *method_types)
+{
+ struct objc_method * method;
+
+ if (class_ == Nil || selector == NULL || implementation == NULL
+ || method_types == NULL)
+ return NULL;
+
+ method = search_for_method_in_hierarchy (class_, selector);
+
+ if (method)
+ {
+ return method_setImplementation (method, implementation);
+ }
+ else
+ {
+ class_addMethod (class_, selector, implementation, method_types);
+ return NULL;
+ }
+}
+
+/* Search for a method starting from the current class up its
+ hierarchy. Return a pointer to the method's method structure if
+ found. NULL otherwise. */
+static struct objc_method *
search_for_method_in_hierarchy (Class cls, SEL sel)
{
- Method_t method = NULL;
+ struct objc_method * method = NULL;
Class class;
if (! sel_is_mapped (sel))
return NULL;
- /* Scan the method list of the class. If the method isn't found in the
- list then step to its super class. */
+ /* Scan the method list of the class. If the method isn't found in
+ the list then step to its super class. */
for (class = cls; ((! method) && class); class = class->super_class)
method = search_for_method_in_list (class->methods, sel);
-/* Given a linked list of method and a method's name. Search for the named
- method's method structure. Return a pointer to the method's method
- structure if found. NULL otherwise. */
-Method_t
-search_for_method_in_list (MethodList_t list, SEL op)
+/* Given a linked list of method and a method's name. Search for the
+ named method's method structure. Return a pointer to the method's
+ method structure if found. NULL otherwise. */
+struct objc_method *
+search_for_method_in_list (struct objc_method_list * list, SEL op)
{
- MethodList_t method_list = list;
+ struct objc_method_list * method_list = list;
if (! sel_is_mapped (op))
return NULL;
/* Search the method list. */
for (i = 0; i < method_list->method_count; ++i)
{
- Method_t method = &method_list->method_list[i];
+ struct objc_method * method = &method_list->method_list[i];
if (method->method_name)
if (method->method_name->sel_id == op->sel_id)
static retval_t __objc_forward (id object, SEL sel, arglist_t args);
-/* Forwarding pointers/integers through the normal registers */
+/* Forwarding pointers/integers through the normal registers. */
static id
__objc_word_forward (id rcv, SEL op, ...)
{
}
/* Specific routine for forwarding floats/double because of
- architectural differences on some processors. i386s for
- example which uses a floating point stack versus general
- registers for floating point numbers. This forward routine
- makes sure that GCC restores the proper return values */
+ architectural differences on some processors. i386s for example
+ which uses a floating point stack versus general registers for
+ floating point numbers. This forward routine makes sure that GCC
+ restores the proper return values. */
static double
__objc_double_forward (id rcv, SEL op, ...)
{
}
-/* This function is installed in the dispatch table for all methods which are
- not implemented. Thus, it is called when a selector is not recognized. */
+/* This function is installed in the dispatch table for all methods
+ which are not implemented. Thus, it is called when a selector is
+ not recognized. */
static retval_t
__objc_forward (id object, SEL sel, arglist_t args)
{
static SEL frwd_sel = 0; /* !T:SAFE2 */
SEL err_sel;
- /* first try if the object understands forward:: */
- if (!frwd_sel)
- frwd_sel = sel_get_any_uid("forward::");
+ /* First try if the object understands forward::. */
+ if (! frwd_sel)
+ frwd_sel = sel_get_any_uid ("forward::");
if (__objc_responds_to (object, frwd_sel))
{
- imp = get_imp(object->class_pointer, frwd_sel);
- return (*imp)(object, frwd_sel, sel, args);
+ imp = get_imp (object->class_pointer, frwd_sel);
+ return (*imp) (object, frwd_sel, sel, args);
}
- /* If the object recognizes the doesNotRecognize: method then we're going
- to send it. */
+ /* If the object recognizes the doesNotRecognize: method then we're
+ going to send it. */
err_sel = sel_get_any_uid ("doesNotRecognize:");
if (__objc_responds_to (object, err_sel))
{
}
/* The object doesn't recognize the method. Check for responding to
- error:. If it does then sent it. */
+ error:. If it does then sent it. */
{
- char msg[256 + strlen ((const char*)sel_get_name (sel))
- + strlen ((const char*)object->class_pointer->name)];
+ char msg[256 + strlen ((const char *) sel_getName (sel))
+ + strlen ((const char *) object->class_pointer->name)];
sprintf (msg, "(%s) %s does not recognize %s",
- (CLS_ISMETA(object->class_pointer)
+ (CLS_ISMETA (object->class_pointer)
? "class"
: "instance" ),
- object->class_pointer->name, sel_get_name (sel));
+ object->class_pointer->name, sel_getName (sel));
+ /* TODO: support for error: is surely deprecated ? */
err_sel = sel_get_any_uid ("error:");
if (__objc_responds_to (object, err_sel))
{
return (*imp) (object, sel_get_any_uid ("error:"), msg);
}
- /* The object doesn't respond to doesNotRecognize: or error:; Therefore,
- a default action is taken. */
- objc_error (object, OBJC_ERR_UNIMPLEMENTED, "%s\n", msg);
+ /* The object doesn't respond to doesNotRecognize: or error:;
+ Therefore, a default action is taken. */
+ _objc_abort ("%s\n", msg);
return 0;
}
}
void
-__objc_print_dtable_stats()
+__objc_print_dtable_stats (void)
{
int total = 0;
- objc_mutex_lock(__objc_runtime_mutex);
+ objc_mutex_lock (__objc_runtime_mutex);
#ifdef OBJC_SPARSE2
- printf("memory usage: (%s)\n", "2-level sparse arrays");
+ printf ("memory usage: (%s)\n", "2-level sparse arrays");
#else
- printf("memory usage: (%s)\n", "3-level sparse arrays");
+ printf ("memory usage: (%s)\n", "3-level sparse arrays");
#endif
- printf("arrays: %d = %ld bytes\n", narrays,
- (long)narrays*sizeof(struct sarray));
- total += narrays*sizeof(struct sarray);
- printf("buckets: %d = %ld bytes\n", nbuckets,
- (long)nbuckets*sizeof(struct sbucket));
- total += nbuckets*sizeof(struct sbucket);
-
- printf("idxtables: %d = %ld bytes\n", idxsize, (long)idxsize*sizeof(void*));
- total += idxsize*sizeof(void*);
- printf("-----------------------------------\n");
- printf("total: %d bytes\n", total);
- printf("===================================\n");
-
- objc_mutex_unlock(__objc_runtime_mutex);
+ printf ("arrays: %d = %ld bytes\n", narrays,
+ (long) ((size_t) narrays * sizeof (struct sarray)));
+ total += narrays * sizeof (struct sarray);
+ printf ("buckets: %d = %ld bytes\n", nbuckets,
+ (long) ((size_t) nbuckets * sizeof (struct sbucket)));
+ total += nbuckets * sizeof (struct sbucket);
+
+ printf ("idxtables: %d = %ld bytes\n",
+ idxsize, (long) ((size_t) idxsize * sizeof (void *)));
+ total += idxsize * sizeof (void *);
+ printf ("-----------------------------------\n");
+ printf ("total: %d bytes\n", total);
+ printf ("===================================\n");
+
+ objc_mutex_unlock (__objc_runtime_mutex);
}
-/* Returns the uninstalled dispatch table indicator.
- If a class' dispatch table points to __objc_uninstalled_dtable
- then that means it needs its dispatch table to be installed. */
-__inline__
-struct sarray*
-objc_get_uninstalled_dtable()
+/* Returns the uninstalled dispatch table indicator. If a class'
+ dispatch table points to __objc_uninstalled_dtable then that means
+ it needs its dispatch table to be installed. */
+struct sarray *
+objc_get_uninstalled_dtable (void)
{
return __objc_uninstalled_dtable;
}
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