/* GNU Objective C Runtime message lookup
Copyright (C) 1993, 1995, 1996, 1997, 1998,
- 2001 Free Software Foundation, Inc.
+ 2001, 2002, 2004 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.
-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. */
+GCC; see the file COPYING. If not, write to the Free Software
+Foundation, 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, 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
however invalidate any other reasons why the executable file might be
covered by the GNU General Public License. */
+/* FIXME: This file has no business including tm.h. */
+/* FIXME: This should be using libffi instead of __builtin_apply
+ and friends. */
+
#include "tconfig.h"
-#include "runtime.h"
-#include "sarray.h"
-#include "encoding.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "objc/runtime.h"
+#include "objc/sarray.h"
+#include "objc/encoding.h"
#include "runtime-info.h"
-/* 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
+/* Alread 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 */
-
-/* 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;
+struct sarray *__objc_uninstalled_dtable = 0; /* !T:MUTEX */
+
+/* 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);
+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);
+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, ...);
+__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, ...);
+Method_t search_for_method_in_list (MethodList_t list, SEL op);
+id nil_method (id, SEL);
/* Given a selector, return the proper forwarding implementation. */
-__inline__
+inline
IMP
-__objc_get_forward_imp (SEL sel)
+__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)))
+ if ((result = __objc_msg_forward (sel)) != NULL)
return result;
}
- else
+
+ /* 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
+ && objc_sizeof_type (t) > OBJC_MAX_STRUCT_BY_VALUE
#endif
)
return (IMP)__objc_block_forward;
}
/* Given a class and selector, return the selector's implementation. */
-__inline__
+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)
+ 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);
+ 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);
+ 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. Return the forwarding
+ implementation. */
+ res = __objc_get_forward_imp ((id)class, sel);
+ }
}
}
return res;
/* 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__
+inline
BOOL
__objc_responds_to (id object, SEL sel)
{
- void* res;
+ void *res;
/* 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 */
/* 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__
+inline
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)
+ 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);
+ __objc_init_install_dtable (receiver, op);
/* Get real method for this in newly installed dtable */
- result = get_imp(receiver->class_pointer, op);
+ 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)
+ {
+ /* 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
if (super->self)
return get_imp (super->class, sel);
else
- return nil_method;
+ return (IMP)nil_method;
}
-int method_get_sizeof_arguments (Method*);
+int method_get_sizeof_arguments (Method *);
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);
+ 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);
}
/* 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)
+__objc_init_install_dtable (id receiver, SEL op __attribute__ ((__unused__)))
{
+ 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)
- return;
-
- objc_mutex_lock(__objc_runtime_mutex);
-
- if(CLS_ISCLASS(receiver->class_pointer))
+ if (receiver->class_pointer->dtable != __objc_uninstalled_dtable)
+ {
+ objc_mutex_unlock (__objc_runtime_mutex);
+ return;
+ }
+
+ if (CLS_ISCLASS (receiver->class_pointer))
{
/* receiver is an ordinary object */
- assert(CLS_ISCLASS(receiver->class_pointer));
+ assert (CLS_ISCLASS (receiver->class_pointer));
/* 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);
+ __objc_send_initialize (receiver->class_pointer);
}
else
{
/* receiver is a class object */
- assert(CLS_ISCLASS((Class)receiver));
- assert(CLS_ISMETA(receiver->class_pointer));
+ assert (CLS_ISCLASS ((Class)receiver));
+ assert (CLS_ISMETA (receiver->class_pointer));
/* 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 */
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 */
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));
+ assert (CLS_ISCLASS (class));
+ assert (! CLS_ISMETA (class));
- if (!CLS_ISINITIALIZED(class))
+ if (! CLS_ISINITIALIZED (class))
{
- CLS_SETINITIALIZED(class);
- CLS_SETINITIALIZED(class->class_pointer);
+ CLS_SETINITIALIZED (class);
+ CLS_SETINITIALIZED (class->class_pointer);
/* 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");
int i;
Method_t method;
- for (i = 0; i< method_list->method_count; i++) {
+ 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) {
}
if (imp)
- (*imp)((id)class, op);
+ (*imp) ((id) class, op);
}
}
{
int i;
- if (!method_list)
+ if (! method_list)
return;
if (method_list->method_next)
/* 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 (! CLS_ISRESOLV (class))
+ __objc_resolve_class_links ();
super = class->super_class;
/* 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);
if (class->dtable == __objc_uninstalled_dtable)
return;
- objc_mutex_lock(__objc_runtime_mutex);
+ objc_mutex_lock (__objc_runtime_mutex);
arr = class->dtable;
__objc_install_premature_dtable (class); /* someone might require it... */
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 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)
{
- 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;
}
Method_t
-class_get_instance_method(Class class, SEL op)
+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)
+class_get_class_method (MetaClass class, SEL op)
{
- return search_for_method_in_hierarchy(class, op);
+ return search_for_method_in_hierarchy (class, op);
}
SEL err_sel;
/* first try if the object understands forward:: */
- if (!frwd_sel)
- frwd_sel = sel_get_any_uid("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
/* The object doesn't recognize the method. Check for responding to
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_get_name (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));
}
void
-__objc_print_dtable_stats()
+__objc_print_dtable_stats ()
{
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) (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);
}
/* 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()
+inline
+struct sarray *
+objc_get_uninstalled_dtable ()
{
return __objc_uninstalled_dtable;
}
OSDN Git Service
