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/*
 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
 *               2018, 2019, 2020
 *   Jonathan Schleifer <js@nil.im>
 * Copyright (c) 2008-2021 Jonathan Schleifer <js@nil.im>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
 * 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"

#include "platform.h"

.intel_syntax noprefix

.globl of_forward
.globl of_forward_stret

.section .text
of_forward:
	push	ebp
	mov	ebp, esp
	pushl	%ebp
	movl	%esp, %ebp

	push	ebx
	sub	esp, 20
	pushl	%ebx
	subl	$20, %esp

	call	get_eip
	add	ebx, offset _GLOBAL_OFFSET_TABLE_
	addl	$_GLOBAL_OFFSET_TABLE_, %ebx

	mov	eax, [ebp+8]
	mov	[esp], eax
	movl	8(%ebp), %eax
	movl	%eax, (%esp)
	call	object_getClass@PLT

	mov	[esp], eax
	lea	eax, [ebx+sel_forwardingTargetForSelector_@GOTOFF]
	mov	[esp+4], eax
	movl	%eax, (%esp)
	leal	sel_forwardingTargetForSelector_@GOTOFF(%ebx), %eax
	movl	%eax, 4(%esp)
	call	class_respondsToSelector@PLT

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

	mov	eax, [ebp+8]
	mov	[esp], eax
	lea	eax, [ebx+sel_forwardingTargetForSelector_@GOTOFF]
	mov	[esp+4], eax
	movl	8(%ebp), %eax
	movl	%eax, (%esp)
	leal	sel_forwardingTargetForSelector_@GOTOFF(%ebx), %eax
	movl	%eax, 4(%esp)
	call	objc_msg_lookup@PLT

	mov	edx, [ebp+8]
	mov	[esp], edx
	lea	edx, [ebx+sel_forwardingTargetForSelector_@GOTOFF]
	mov	[esp+4], edx
	mov	edx, [ebp+12]
	mov	[esp+8], edx
	call	eax
	movl	8(%ebp), %edx
	movl	%edx, (%esp)
	leal	sel_forwardingTargetForSelector_@GOTOFF(%ebx), %edx
	movl	%edx, 4(%esp)
	movl	12(%ebp), %edx
	movl	%edx, 8(%esp)
	call	*%eax

	test	eax, eax
	jz	short 0f
	cmp	eax, [ebp+8]
	je	short 0f
	testl	%eax, %eax
	jz	0f
	cmpl	8(%ebp), %eax
	je	0f

	mov	[ebp+8], eax
	mov	[esp], eax
	mov	eax, [ebp+12]
	mov	[esp+4], eax
	movl	%eax, 8(%ebp)
	movl	%eax, (%esp)
	movl	12(%ebp), %eax
	movl	%eax, 4(%esp)
	call	objc_msg_lookup@PLT

	add	esp, 20
	pop	ebx
	pop	ebp
	addl	$20, %esp
	popl	%ebx
	popl	%ebp

	jmp	eax
	jmp	*%eax

0:
	lea	eax, [ebx+of_method_not_found@GOTOFF]
	leal	of_method_not_found@GOTOFF(%ebx), %eax

	add	esp, 20
	pop	ebx
	pop	ebp
	addl	$20, %esp
	popl	%ebx
	popl	%ebp

	jmp	eax
	jmp	*%eax
.type of_forward, %function
.size of_forward, .-of_forward

of_forward_stret:
	push	ebp
	mov	ebp, esp
	pushl	%ebp
	movl	%esp, %ebp

	push	ebx
	sub	esp, 20
	pushl	%ebx
	subl	$20, %esp

	call	get_eip
	add	ebx, offset _GLOBAL_OFFSET_TABLE_
	addl	$_GLOBAL_OFFSET_TABLE_, %ebx

	mov	eax, [ebp+12]
	mov	[esp], eax
	movl	12(%ebp), %eax
	movl	%eax, (%esp)
	call	object_getClass@PLT

	mov	[esp], eax
	lea	eax, [ebx+sel_forwardingTargetForSelector_@GOTOFF]
	mov	[esp+4], eax
	movl	%eax, (%esp)
	leal	sel_forwardingTargetForSelector_@GOTOFF(%ebx), %eax
	movl	%eax, 4(%esp)
	call	class_respondsToSelector@PLT

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

	mov	eax, [ebp+12]
	mov	[esp], eax
	lea	eax, [ebx+sel_forwardingTargetForSelector_@GOTOFF]
	mov	[esp+4], eax
	movl	12(%ebp), %eax
	movl	%eax, (%esp)
	leal	sel_forwardingTargetForSelector_@GOTOFF(%ebx), %eax
	movl	%eax, 4(%esp)
	call	objc_msg_lookup@PLT

	mov	edx, [ebp+12]
	mov	[esp], edx
	lea	edx, [ebx+sel_forwardingTargetForSelector_@GOTOFF]
	mov	[esp+4], edx
	mov	edx, [ebp+16]
	mov	[esp+8], edx
	call	eax
	movl	12(%ebp), %edx
	movl	%edx, (%esp)
	leal	sel_forwardingTargetForSelector_@GOTOFF(%ebx), %edx
	movl	%edx, 4(%esp)
	movl	16(%ebp), %edx
	movl	%edx, 8(%esp)
	call	*%eax

	test	eax, eax
	jz	short 0f
	cmp	eax, [ebp+12]
	je	short 0f
	testl	%eax, %eax
	jz	0f
	cmpl	12(%ebp), %eax
	je	0f

	mov	[ebp+12], eax
	mov	[esp], eax
	mov	eax, [ebp+16]
	mov	[esp+4], eax
	movl	%eax, 12(%ebp)
	movl	%eax, (%esp)
	movl	16(%ebp), %eax
	movl	%eax, 4(%esp)
	call	objc_msg_lookup_stret@PLT

	add	esp, 20
	pop	ebx
	pop	ebp
	addl	$20, %esp
	popl	%ebx
	popl	%ebp

	jmp	eax
	jmp	*%eax

0:
	lea	eax, [ebx+of_method_not_found_stret@GOTOFF]
	leal	of_method_not_found_stret@GOTOFF(%ebx), %eax

	add	esp, 20
	pop	ebx
	pop	ebp
	addl	$20, %esp
	popl	%ebx
	popl	%ebp

	jmp	eax
	jmp	*%eax
.type of_forward_stret, %function
.size of_forward_stret, .-of_forward_stret

init:
	push	ebp
	mov	ebp, esp
	pushl	%ebp
	movl	%esp, %ebp

	push	ebx
	sub	esp, 4
	pushl	%ebx
	subl	$4, %esp

	call	get_eip
	add	ebx, offset _GLOBAL_OFFSET_TABLE_
	addl	$_GLOBAL_OFFSET_TABLE_, %ebx

	lea	eax, [ebx+module@GOTOFF]
	mov	[esp], eax
	leal	module@GOTOFF(%ebx), %eax
	movl	%eax, (%esp)
	call	__objc_exec_class@PLT

	add	esp, 4
	pop	ebx
	pop	ebp
	addl	$4, %esp
	popl	%ebx
	popl	%ebp
	ret

get_eip:
	mov	ebx, [esp]
	movl	(%esp), %ebx
	ret

#ifdef OF_SOLARIS
.section .init_array, "aw"
#else
.section .ctors, "aw", %progbits
#endif
︙
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