ObjFW  Diff

 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#include "config.h"

.intel_syntax noprefix

.globl _objc_msg_lookup
.globl _objc_msg_lookup_stret
.globl _objc_msg_lookup_super
.globl _objc_msg_lookup_super_stret

.section .text
.macro generate_lookup name not_found
\name:
	movl	4(%esp), %edx
	testl	%edx, %edx
	jz	ret_nil
	mov	edx, [esp+4]
	test	edx, edx
	jz	short ret_nil

	movl	(%edx), %edx
	movl	32(%edx), %edx
	mov	edx, [edx]
	mov	edx, [edx+32]

.Lmain_\name:
	movl	8(%esp), %eax
	mov	eax, [esp+8]

#ifdef OF_SELUID24
	movzbl	2(%eax), %ecx
	movl	(%edx,%ecx,4), %edx
	movzx	ecx, byte ptr [eax+2]
	mov	edx, [edx+ecx*4]
#endif
	movzbl	1(%eax), %ecx
	movl	(%edx,%ecx,4), %edx
	movzbl	(%eax), %ecx
	movl	(%edx,%ecx,4), %eax
	movzx	ecx, byte ptr [eax+1]
	mov	edx, [edx+ecx*4]
	movzx	ecx, byte ptr [eax]
	mov	eax, [edx+ecx*4]

	testl	%eax, %eax
	jz	0f
	test	eax, eax
	jz	short 0f

	ret

0:
	call	get_eip
1:
	addl	$\not_found-1b, %eax
	jmp	\not_found
	jmp	*%eax
.endm

.macro generate_lookup_super name lookup
\name:
	movl	4(%esp), %edx
	movl	(%edx), %eax
	cmpl	$0, %eax
	je	ret_nil
	mov	edx, [esp+4]
	mov	eax, [edx]
	test	eax, eax
	jz	short ret_nil

	movl	%eax, 4(%esp)
	movl	4(%edx), %edx
	movl	32(%edx), %edx
	jmp	.Lmain_\lookup
	mov	[esp+4], eax
	mov	edx, [edx+4]
	mov	edx, [edx+32]
	jmp	short .Lmain_\lookup
.endm

generate_lookup _objc_msg_lookup _objc_method_not_found
generate_lookup _objc_msg_lookup_stret _objc_method_not_found_stret
generate_lookup_super _objc_msg_lookup_super _objc_msg_lookup
generate_lookup_super _objc_msg_lookup_super_stret _objc_msg_lookup_stret

ret_nil:
	call	get_eip
0:
	addl	$nil_method-0b, %eax
	mov	eax, offset nil_method
	ret

nil_method:
	xorl	%eax, %eax
	xor	eax, eax
	ret

get_eip:
	movl	(%esp), %eax
	ret