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|
/* -*- mode: objc; coding: utf-8 -*- */
/* Objective-CL, an Objective-C bridge for Common Lisp.
* Copyright (C) 2007 Matthias Andreas Benkard.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*/
#import "libobjcl.h"
#import "NSObject-ObjectiveCLWrapperLink.h"
#import "PyObjC/libffi_support.h"
#import "JIGS/ObjcRuntimeUtilities.h"
#import "Foundation/Foundation.h"
#include <stdarg.h>
#include <sys/mman.h>
#include <objc/objc-api.h>
#ifdef __NEXT_RUNTIME__
#include <objc/objc-class.h>
#endif
#if 0
#define TRACE NSLog
#else
#define TRACE objcl_null_log
#endif
static void
objcl_null_log (NSString *s, ...)
{
}
static NSAutoreleasePool *objcl_autorelease_pool = nil;
/* Preallocate an exception to throw when memory is all used up. */
NSException *objcl_oom_exception = nil;
id objcl_current_exception = nil;
NSRecursiveLock *objcl_current_exception_lock = nil;
static NSMutableDictionary *method_lists = nil;
static NSMutableDictionary *method_list_lengths = nil;
static int init_count = 0;
void
objcl_initialise_runtime (void)
{
if (init_count <= 0)
{
objcl_autorelease_pool = [[NSAutoreleasePool alloc] init];
objcl_oom_exception = [NSException exceptionWithName: @"MLKOutOfMemoryException"
reason: @"Out of memory"
userInfo: nil];
[objcl_oom_exception retain];
#ifdef __NEXT_RUNTIME__
PyObjC_SetupRuntimeCompat ();
#endif
objcl_current_exception_lock = [[NSRecursiveLock alloc] init];
method_lists = [[NSMutableDictionary alloc] init];
method_list_lengths = [[NSMutableDictionary alloc] init];
objcl_initialise_instance_wrappers ();
init_count = 1;
}
else
init_count++;
}
static void
release_unless_null (id *object)
{
if (*object)
{
[*object release];
*object = NULL;
}
}
void
objcl_shutdown_runtime (void)
{
init_count--;
if (init_count == 0)
{
release_unless_null (&objcl_autorelease_pool);
release_unless_null (&objcl_current_exception_lock);
release_unless_null (&objcl_oom_exception);
release_unless_null (&method_lists);
release_unless_null (&method_list_lengths);
objcl_shutdown_instance_wrappers ();
}
else if (init_count < 0)
init_count = 0;
}
#ifdef USE_LIBFFI
id
objcl_invoke_with_types (int argc,
Class superclass_for_send_super,
char *return_typespec,
char *arg_typespecs[],
void *return_value,
void **argv)
{
IMP method;
int i;
ffi_cif cif;
ffi_type *return_type;
ffi_type *arg_types[argc + 2];
ffi_status status;
id receiver = *((id*)argv[0]);
SEL method_selector = *((SEL*)argv[1]);
static ffi_type *id_type = NULL;
static ffi_type *sel_type = NULL;
if (!id_type)
id_type = objcl_pyobjc_arg_signature_to_ffi_type ("@");
if (!sel_type)
sel_type = objcl_pyobjc_arg_signature_to_ffi_type (":");
NS_DURING
{
TRACE (@"get-method");
/* FIXME: The NeXT runtime wants to use special functions for
structure and floating-point returns.
Note that there is no objc_msgSendSuper_fpret. The reason is
that objc_msgSendSuper will never be passed nil as the instance
to call a method on, while using objc_msgSend_fpret is
important only so that sending a message to nil may return a
sane value.
Which means that if we don't allow nil to be messaged, we
probably don't need to bother with objc_msgSend_fpret,
either. */
method = objcl_get_method_implementation (receiver, method_selector,
superclass_for_send_super);
TRACE (@"method == NULL");
if (method == NULL)
[[NSException exceptionWithName: @"MLKNoApplicableMethod"
reason: @"Tried to call a non-existent method."
userInfo: nil] raise];
TRACE (@"return type");
return_type = objcl_pyobjc_signature_to_ffi_return_type (return_typespec);
arg_types[0] = id_type;
arg_types[1] = sel_type;
TRACE (@"args");
for (i = 0; i < argc; i++)
arg_types[i + 2] = objcl_pyobjc_arg_signature_to_ffi_type (arg_typespecs[i]);
TRACE (@"prep");
status = ffi_prep_cif (&cif, FFI_DEFAULT_ABI, argc + 2, return_type, arg_types);
if (status != FFI_OK)
{
[[NSException exceptionWithName: @"MLKInvalidFFITypeException"
reason: @"FFI type is invalid (this is probably a bug)."
userInfo: nil] raise];
}
TRACE (@"call");
ffi_call (&cif, FFI_FN (method), return_value, argv);
TRACE (@"...");
}
NS_HANDLER
{
NS_VALUERETURN (localException, id);
}
NS_ENDHANDLER
return nil;
}
#endif
Class
objcl_find_class (const char *class_name)
{
TRACE (@"find-class %s", class_name);
#ifdef __NEXT_RUNTIME__
return objc_getClass (class_name);
#else
return objc_lookup_class (class_name);
#endif
}
Class
objcl_find_meta_class (const char *class_name)
{
TRACE (@"find-meta-class %s", class_name);
#ifdef __NEXT_RUNTIME__
return objc_getMetaClass (class_name);
#else
/* FIXME: Is this correct? */
Class class = objcl_find_class (class_name);
if (class == NULL || class == Nil)
return Nil;
else
return class_get_meta_class (class);
#endif
}
SEL
objcl_find_selector (const char *selector_name)
{
#ifdef __NEXT_RUNTIME__
if (!(sel_isMapped ((SEL) selector_name))) /* XXX Does this work? */
return NULL;
else
return sel_getUid (selector_name);
#else
return sel_get_any_uid (selector_name);
#endif
}
SEL
objcl_intern_selector (const char *selector_name)
{
/* sel_registerName and sel_register_name seem not to be necessary here. */
#ifdef __NEXT_RUNTIME__
return sel_getUid (selector_name);
#else
return sel_get_uid (selector_name);
#endif
}
const char *
objcl_class_name (Class class)
{
const char *ns_name;
char *name;
TRACE (@"class-name");
ns_name = [(NSStringFromClass (class)) UTF8String];
name = malloc (strlen (ns_name) + 1);
strcpy (name, ns_name);
return name;
}
Class
objcl_class_superclass (Class class)
{
TRACE (@"super-class");
/* Not strictly needed on the GNU runtime, but not going to hurt
anyone either. */
if (class == [NSObject class])
return nil;
#ifdef __NEXT_RUNTIME__
return class_getSuperclass (class);
#else
return class_get_super_class (class);
#endif
}
MetaClass
objcl_class_metaclass (Class class)
{
#ifdef __NEXT_RUNTIME__
return objc_getMetaClass (class);
#else
return class_get_meta_class (class);
#endif
}
const char *
objcl_selector_name (SEL selector)
{
const char *ns_name;
char *name;
ns_name = [(NSStringFromSelector (selector)) UTF8String];
name = malloc (strlen (ns_name) + 1);
strcpy (name, ns_name);
return name;
}
IMP
objcl_get_method_implementation (id object,
SEL selector,
Class superclass_for_send_super)
{
/* If superclass_for_send_super == nil, this is just plain old method
implementation hunting. If it isn't, though, we're trying to do a
super call, which can get a bit hairy quickly. */
TRACE (@"method-impl %p %p", object, selector);
#ifdef __NEXT_RUNTIME__
Class target_class;
if (objcl_object_is_class (object))
{
if (superclass_for_send_super == Nil)
target_class = object;
else
target_class = superclass_for_send_super;
return method_getImplementation (class_getClassMethod (target_class,
selector));
}
else
{
if (superclass_for_send_super == Nil)
target_class = [object class];
else
target_class = superclass_for_send_super;
#ifdef __OBJC2__
return class_getMethodImplementation (target_class, selector);
#else
return method_getImplementation (class_getInstanceMethod (target_class,
selector));
#endif
}
#else
if (superclass_for_send_super == Nil)
return objc_msg_lookup (object, selector);
else
{
Super super_struct;
super_struct.self = object;
super_struct.class = superclass_for_send_super;
return objc_msg_lookup_super (&super_struct, selector);
}
#endif
}
BOOL
objcl_object_is_class (id obj)
{
TRACE (@"is-class %p", obj);
#ifdef __NEXT_RUNTIME__
return [obj class] == obj;
#else
/* return CLS_ISCLASS (obj); */
return object_is_class (obj);
#endif
}
BOOL
objcl_object_is_meta_class (id obj)
{
TRACE (@"is-meta-class %p", obj);
#ifdef __NEXT_RUNTIME__
return objcl_object_is_class (obj) && class_isMetaClass (obj);
#else
/* return CLS_ISMETA (ptr); */
if (objcl_object_is_class (obj))
return class_is_meta_class (obj);
else
return object_is_meta_class (obj);
#endif
}
Class
objcl_object_get_class (id obj)
{
TRACE (@"get-class %p", obj);
#ifdef __NEXT_RUNTIME__
return object_getClass (obj);
#else
return object_get_class (obj);
#endif
}
Class
objcl_object_get_meta_class (id obj)
{
TRACE (@"get-meta-class %p", obj);
#ifdef __NEXT_RUNTIME__
/* FIXME: What to do here? */
return objc_getMetaClass ([(NSStringFromClass ([obj class])) UTF8String]);
#else
if (objcl_object_is_class (obj))
return class_get_meta_class (obj);
else
return object_get_meta_class (obj);
#endif
}
id
objcl_get_nil (void)
{
return nil;
}
long
objcl_get_yes (void)
{
if (sizeof (YES) > sizeof (long))
fprintf (stderr, "WARNING: objcl_get_yes: YES might not fit into a long.\n");
return YES;
}
long
objcl_get_no (void)
{
if (sizeof (NO) > sizeof (long))
fprintf (stderr, "WARNING: objcl_get_no: NO might not fit into a long.\n");
return NO;
}
const char *
objcl_get_runtime_type (void)
{
#ifdef __NEXT_RUNTIME__
return "NeXT";
#else
return "GNU";
#endif
}
int
objcl_objc2_p (void)
{
#ifdef __OBJC2__
return 1;
#else
return 0;
#endif
}
long
objcl_sizeof_type (const char *typespec)
{
if (sizeof (ssize_t) > sizeof (long))
fprintf (stderr, "WARNING: objcl_sizeof_typespec: Size might not fit into a long.\n");
return PyObjCRT_SizeOfType (typespec);
}
long
objcl_sizeof_return_type (const char *typespec)
{
if (sizeof (ssize_t) > sizeof (long))
fprintf (stderr, "WARNING: objcl_sizeof_return_typespec: Size might not fit into a long.\n");
return PyObjCRT_SizeOfReturnType (typespec);
}
long
objcl_alignof_type (const char *typespec)
{
if (sizeof (ssize_t) > sizeof (long))
fprintf (stderr, "WARNING: objcl_align_typespec: Alignment might not fit into a long.\n");
return PyObjCRT_AlignOfType (typespec);
}
void
objcl_set_slot_value (id obj, const char *ivar_name, void *value)
{
/* For the GNU runtime, this function is defined in objc-runtime-gnu.m. */
object_setInstanceVariable (obj, ivar_name, value);
}
void
objcl_get_slot_value (id obj, const char *ivar_name, void *value_out)
{
/* Caching Ivars may be useful here. Using those instead of strings
is claimed to be faster. */
/* For the GNU runtime, this function is defined in objc-runtime-gnu.m. */
/* NOTE: Contrary to what the official Objective-C runtime docs claim,
value_out is actually a (void *) rather than a (void **).
Likewise, the result that is copied to value_out is the slot value
itself, not a pointer to it. */
/* NOTE UPDATE: Actually, it's trickier than that. The docs for
NeXTstep 3.3 say: ``These functions cannot reliably be used to set
and get instance variables that are not pointers.'' This makes the
behaviour and documentation a bit less confusing, because it means
that value_out is, in fact, assigned a pointer to the value of the
slot under the assumption that the slot itself references its value
via a pointer. */
object_getInstanceVariable (obj, ivar_name, value_out);
}
IVAR_T *
objcl_class_direct_slots (Class class, unsigned int *count, unsigned int *element_size)
{
IVAR_T *ivars;
#ifdef __NEXT_RUNTIME__
TRACE (@"slots");
#else
int i;
#endif
*element_size = sizeof (IVAR_T);
#ifdef __NEXT_RUNTIME__
ivars = class_copyIvarList (class, count);
#else
*count = (class->ivars ? class->ivars->ivar_count : 0);
if (!*count)
ivars = NULL;
else
{
ivars = malloc ((*count) * (*element_size));
for (i = 0; i < *count; i++)
ivars[i] = &class->ivars->ivar_list[i];
}
#endif
return ivars;
}
const char *
objcl_slot_name (IVAR_T ivar)
{
TRACE (@"slot-name");
#ifdef __NEXT_RUNTIME__
return ivar_getName (ivar);
#else
return ivar->ivar_name;
#endif
}
const char *
objcl_slot_type (IVAR_T ivar)
{
#ifdef __NEXT_RUNTIME__
return ivar_getTypeEncoding (ivar);
#else
return ivar->ivar_type;
#endif
}
/* In order to be able to do exception propagation from Lisp code, we
have the Lisp layer save exceptions to objcl_current_exception. Our
wrapper function is then able to raise the exception from where it
ought to be raised from: the Objective-C layer.
Note that it is the Lisp layer's duty to wrap Objective-C exceptions
around Lisp SERIOUS-CONDITIONs in order to propagate those. */
static void
imp_closure (ffi_cif *cif, void *result, void **args, void *user_data)
{
id exception;
ffi_call (cif, user_data, result, args);
exception = objcl_current_exception;
objcl_current_exception = nil;
objcl_release_lock (objcl_current_exception_lock);
if (exception != nil)
[exception raise];
}
IMP
objcl_create_imp (IMP callback,
int argc,
const char *return_typespec,
const char *arg_typespecs[])
{
ffi_type *return_type;
ffi_type *arg_types[argc + 2];
ffi_status status;
ffi_cif cif;
ffi_closure *closure;
int i;
static ffi_type *id_type = NULL;
static ffi_type *sel_type = NULL;
if (!id_type)
id_type = objcl_pyobjc_arg_signature_to_ffi_type ("@");
if (!sel_type)
sel_type = objcl_pyobjc_arg_signature_to_ffi_type (":");
return_type = objcl_pyobjc_signature_to_ffi_return_type (return_typespec);
arg_types[0] = id_type;
arg_types[1] = sel_type;
for (i = 0; i < argc; i++)
arg_types[i + 2] = objcl_pyobjc_arg_signature_to_ffi_type (arg_typespecs[i]);
status = ffi_prep_cif (&cif, FFI_DEFAULT_ABI, argc + 2, return_type, arg_types);
if (status != FFI_OK)
{
[[NSException exceptionWithName: @"MLKInvalidFFITypeException"
reason: @"FFI type is invalid (this is probably a bug)."
userInfo: nil] raise];
}
status = ffi_prep_closure (closure, &cif, imp_closure, (void *)callback);
if (status != FFI_OK)
{
[[NSException exceptionWithName: @"MLKClosureCreationFailure"
reason: @"Creating an IMP closure failed (this is probably a bug)."
userInfo: nil] raise];
}
if (mprotect (closure, sizeof (closure), PROT_READ | PROT_EXEC) == -1)
{
[[NSException exceptionWithName: @"MLKClosureCreationFailure"
reason: @"Creating an IMP closure failed (this is probably a bug)."
userInfo: nil] raise];
}
return (IMP) closure;
}
void
objcl_acquire_lock (id lock)
{
[lock lock];
TRACE (@"Lock %@ acquired.", lock);
}
void
objcl_release_lock (id lock)
{
[lock unlock];
TRACE (@"Lock %@ released.", lock);
}
Class
objcl_create_class (const char *class_name,
Class superclass,
int protocol_number,
const char *protocol_names[],
int ivar_number,
const char *ivar_names[],
const char *ivar_typespecs[])
{
#ifdef __NEXT_RUNTIME__
int i;
Class class;
objc_allocateClassPair (superclass, class_name, 0);
class = objcl_find_class (class_name);
for (i = 0; i < ivar_number; i++)
preclass_addIvar (class,
ivar_names[i],
objcl_sizeof_type (ivar_typespecs[i]),
objcl_alignof_type (ivar_typespecs[i]),
ivar_typespecs[i]);
#ifdef __OBJC2__
/* FIXME: What to do for the NeXT Objective-C 1.0 and GNU runtimes
here? */
for (i = 0; i < protocol_number; i++)
preclass_addProtocol (class,
objc_getProtocol ((char *) protocol_names[i])
/* ??? !__OBJC2__ ???
objc_getClass (protocol_names[i]) */
);
#endif
return class;
#else
ffi_cif cif;
ffi_status status;
ffi_type *arg_types[3 + ivar_number*2];
void *argv[3 + ivar_number*2];
int i;
BOOL return_value;
const char *superclass_name;
arg_types[0] = &ffi_type_pointer;
arg_types[1] = &ffi_type_pointer;
arg_types[2] = &ffi_type_sint;
for (i = 0; i < ivar_number*2; i++)
arg_types[3 + i] = &ffi_type_pointer;
superclass_name = objcl_class_name (superclass);
argv[0] = &class_name;
argv[1] = &superclass_name;
argv[2] = &ivar_number;
for (i = 0; i < ivar_number; i++)
{
argv[3 + 2*i] = (void *) &ivar_names[2*i];
argv[3 + 2*i + 1] = (void *) &ivar_names[2*i + 1];
}
status = ffi_prep_cif (&cif, FFI_DEFAULT_ABI, ivar_number*2 + 3, &ffi_type_uchar, arg_types);
if (status != FFI_OK)
{
[[NSException exceptionWithName: @"MLKInvalidFFITypeException"
reason: @"FFI type is invalid (this is probably a bug)."
userInfo: nil] raise];
}
ffi_call (&cif, FFI_FN (ObjcUtilities_new_class), &return_value, argv);
NSString *ns_class_name = [NSString stringWithUTF8String: class_name];
[method_lists setObject:
[NSValue valueWithPointer: ObjcUtilities_alloc_method_list]
forKey: ns_class_name];
[method_list_lengths setObject: [NSNumber numberWithInt: 0]
forKey: ns_class_name];
return objcl_find_class (class_name);
#endif
}
void
objcl_add_method (Class class,
SEL method_name,
IMP callback,
int argc,
const char *return_typespec,
const char *arg_typespecs[],
const char *signature)
{
IMP imp;
imp = objcl_create_imp (callback, argc, return_typespec, arg_typespecs);
#ifdef __NEXT_RUNTIME__
preclass_addMethod (class, method_name, imp, signature);
#else
NSString *class_name = [NSString stringWithUTF8String: objcl_class_name (class)];
MethodList *method_list = [[method_lists objectForKey: class_name] pointerValue];
int index = [[method_list_lengths objectForKey: class_name] intValue];
ObjcUtilities_insert_method_in_list
(method_list,
index,
objcl_selector_name (method_name),
ObjcUtilities_build_runtime_Objc_signature (signature),
imp);
[method_list_lengths setObject: [NSNumber numberWithInt: index]
forKey: class_name];
#endif
}
void
objcl_finalise_class (Class class)
{
#ifdef __NEXT_RUNTIME__
/* FIXME: Should we do this if class is a metaclass? */
objc_registerClassPair (class);
#else
NSString *class_name = [NSString stringWithUTF8String:
objcl_class_name (class)];
ObjcUtilities_register_method_list
(class, [[method_lists objectForKey: class_name]
pointerValue]);
[method_lists removeObjectForKey: class_name];
[method_list_lengths removeObjectForKey: class_name];
#endif
}
int
objcl_class_backed_by_lisp_class_p (Class class)
{
return [class __objcl_isBackedByLispClass];
}
void
objcl_class_set_backed_by_lisp_class (Class class, int backed_p)
{
[class __objcl_setBackedByLispClass: backed_p];
}
int
objcl_object_backed_by_lisp_class_p (id object)
{
return [[object class] __objcl_isBackedByLispClass];
}
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