ObjFW  Check-in [f5747ff94a]

Overview
Comment:Better way of calling the forwarding handler.
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SHA3-256: f5747ff94afb6f3d972edd77cbb162860f616178e8a3f27203c9f26dcf3ddc4f
User & Date: js on 2012-05-09 13:54:48
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Context
2012-05-09
13:55
Initialize classes on the first dispatch. check-in: dcf845546a user: js tags: runtime
13:54
Better way of calling the forwarding handler. check-in: f5747ff94a user: js tags: runtime
2012-05-08
20:30
Add support for 16 bit selector UIDs. check-in: fef47937e5 user: js tags: runtime
Changes
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Modified src/runtime/lookup-amd64-elf.S from [09c8f5af4a] to [2e8002927c].

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	testq	%rax, %rax
	jz	forward

	ret

forward:
	mov	objc_forward_handler@GOTPCREL(%rip), %rax
	mov	objc_not_found_handler@GOTPCREL(%rip), %rax
	jmp	*(%rax)

objc_msg_lookup_super:
	movq	(%rdi), %rax
	testq	%rax, %rax
	jz	ret_nil
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Modified src/runtime/lookup-x86-elf.S from [d301a0d068] to [b73cd77fba].

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	jz	forward

	ret

forward:
	call	get_eip
.L1:
	addl	$objc_forward_handler-.L1, %eax
	addl	$objc_not_found_handler-.L1, %eax
	jmp	*(%eax)

objc_msg_lookup_super:
	movl	4(%esp), %edx
	cmpl	$0, (%edx)
	je	ret_nil
︙

Modified src/runtime/lookup.m from [4a37e847d8] to [9ff82b2e4e].

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

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

static IMP not_found_handler(id, SEL);
IMP (*objc_forward_handler)(id, SEL) = not_found_handler;
IMP (*objc_forward_handler)(id, SEL) = NULL;

static IMP
not_found_handler(id obj, SEL sel)
IMP
objc_not_found_handler(id obj, SEL sel)
{
	if (objc_forward_handler != NULL)
		return objc_forward_handler(obj, sel);

	ERROR("Selector %s is not implemented for class %s!",
	    sel_getName(sel), obj->isa->name);
}

BOOL
class_respondsToSelector(Class cls, SEL sel)
{
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	if (obj == nil)
		return (IMP)nil_method;

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

	if (imp == NULL)
		return objc_forward_handler(obj, sel);
		return objc_not_found_handler(obj, sel);

	return imp;
}

IMP
objc_msg_lookup_super(struct objc_super *super, SEL sel)
{
	IMP imp;

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

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

	if (imp == NULL)
		return objc_forward_handler(super->self, sel);
		return objc_not_found_handler(super->self, sel);

	return imp;
}
#endif

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