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Differences From Artifact [1c3a42c0f8]:

To Artifact [5baad6528e]:

  • File src/runtime/lookup.m — part of check-in [0c332aa2d2] at 2013-12-27 02:07:14 on branch trunk — Rework forwarding API and ABI.

    It matches the Apple API and ABI now and the forwarding handler itself
    determines whether it should forward or not.

    This moves handling of +[resolve{Class,Instance}Method:] to the runtime
    and allows adding new kinds of forwarding without changing the runtime.

    Also fixes a potential stack problem in the forwarding for MIPS. (user: js, size: 4453) [annotate] [blame] [check-ins using]

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#include <stdio.h>
#include <stdlib.h>

#import "runtime.h"
#import "runtime-private.h"
#import "macros.h"

IMP (*objc_forward_handler)(id, SEL) = NULL;
IMP (*objc_forward_handler_stret)(id, SEL) = NULL;
static void *forward_handler = NULL;
static void *forward_handler_stret = NULL;

static IMP
common_not_found_handler(id obj, SEL sel, IMP (*lookup)(id, SEL),
common_method_not_found(id obj, SEL sel, IMP (*lookup)(id, SEL), void *forward)
    IMP (*forward_handler)(id, SEL))
{
	bool is_class = object_getClass(obj)->info & OBJC_CLASS_INFO_METACLASS;

	if (!(object_getClass(obj)->info & OBJC_CLASS_INFO_INITIALIZED)) {
		Class cls = (is_class ? (Class)obj : object_getClass(obj));

		objc_initialize_class(cls);
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		 * The reason for this is that a call to super is not possible
		 * before a message to the class has been sent and it thus has
		 * been initialized together with its superclasses.
		 */
		return lookup(obj, sel);
	}

	/* Try resolveClassMethod:/resolveInstanceMethod: */
	if (class_isMetaClass(object_getClass(obj))) {
		Class cls = object_getClass(obj);

		if (class_respondsToSelector(cls,
		    @selector(resolveClassMethod:)) &&
		    [obj resolveClassMethod: sel]) {
			if (!class_respondsToSelector(cls, sel))
				OBJC_ERROR("[%s resolveClassMethod: %s] "
				    "returned true without adding the method!",
				    class_getName(obj), sel_getName(sel));

			return lookup(obj, sel);
		}
	} else {
		Class cls = object_getClass(obj);
		Class metacls = object_getClass(cls);

		if (class_respondsToSelector(metacls,
		    @selector(resolveInstanceMethod:)) &&
		    [cls resolveInstanceMethod: sel]) {
			if (!class_respondsToSelector(cls, sel))
				OBJC_ERROR("[%s resolveInstanceMethod: %s] "
				    "returned true without adding the method!",
				    class_getName(object_getClass(obj)),
				    sel_getName(sel));

			return lookup(obj, sel);
		}
	}

	if (forward_handler != NULL)
		return forward_handler(obj, sel);
	if (forward != NULL)
		return forward;

	OBJC_ERROR("Selector %c[%s] is not implemented for class %s!",
	    (is_class ? '+' : '-'), sel_getName(sel), object_getClassName(obj));
}

IMP
objc_not_found_handler(id obj, SEL sel)
objc_method_not_found(id obj, SEL sel)
{
	return common_not_found_handler(obj, sel, objc_msg_lookup,
	    objc_forward_handler);
	return common_method_not_found(obj, sel, objc_msg_lookup,
	    forward_handler);
}

IMP
objc_not_found_handler_stret(id obj, SEL sel)
objc_method_not_found_stret(id obj, SEL sel)
{
	return common_not_found_handler(obj, sel, objc_msg_lookup_stret,
	    objc_forward_handler_stret);
	return common_method_not_found(obj, sel, objc_msg_lookup_stret,
	    forward_handler_stret);
}

void
objc_setForwardHandler(void *forward, void *forward_stret)
{
	forward_handler = forward;
	forward_handler_stret = forward_stret;
}

bool
class_respondsToSelector(Class cls, SEL sel)
{
	if (cls == Nil)
		return false;

	return (objc_sparsearray_get(cls->dtable, (uint32_t)sel->uid) != NULL);
}

#ifndef OF_ASM_LOOKUP
static id
nil_method(id self, SEL _cmd)
{
	return nil;
}

static OF_INLINE IMP
common_lookup(id obj, SEL sel, IMP (*not_found_handler)(id, SEL))
common_lookup(id obj, SEL sel, IMP (*not_found)(id, SEL))
{
	IMP imp;

	if (obj == nil)
		return (IMP)nil_method;

	imp = objc_sparsearray_get(object_getClass(obj)->dtable,
	    (uint32_t)sel->uid);

	if (imp == NULL)
		return not_found_handler(obj, sel);
		return not_found(obj, sel);

	return imp;
}

IMP
objc_msg_lookup(id obj, SEL sel)
{
	return common_lookup(obj, sel, objc_not_found_handler);
	return common_lookup(obj, sel, objc_method_not_found);
}

IMP
objc_msg_lookup_stret(id obj, SEL sel)
{
	return common_lookup(obj, sel, objc_not_found_handler_stret);
	return common_lookup(obj, sel, objc_method_not_found_stret);
}

static OF_INLINE IMP
common_lookup_super(struct objc_super *super, SEL sel,
    IMP (*not_found_handler)(id, SEL))
    IMP (*not_found)(id, SEL))
{
	IMP imp;

	if (super->self == nil)
		return (IMP)nil_method;

	imp = objc_sparsearray_get(super->cls->dtable, (uint32_t)sel->uid);

	if (imp == NULL)
		return not_found_handler(super->self, sel);
		return not_found(super->self, sel);

	return imp;
}

IMP
objc_msg_lookup_super(struct objc_super *super, SEL sel)
{
	return common_lookup_super(super, sel, objc_not_found_handler);
	return common_lookup_super(super, sel, objc_method_not_found);
}

IMP
objc_msg_lookup_super_stret(struct objc_super *super, SEL sel)
{
	return common_lookup_super(super, sel, objc_not_found_handler_stret);
	return common_lookup_super(super, sel, objc_method_not_found_stret);
}
#endif
Fossil 2.23 [47362306a7] 2023-11-01 18:56:47
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