/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
* 2018, 2019, 2020
* 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"
.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:
test rcx, rcx
jz short ret_nil
bt ecx, 0
jc short .Ltagged_pointer_\name
mov r8, [rcx]
mov r8, [r8+56]
.Lmain_\name:
mov r10, rcx
mov r11, rdx
mov rax, [rdx]
movzx ecx, ah
movzx edx, al
#ifdef OF_SELUID24
shr eax, 16
mov r8, [r8+rax*8]
#endif
mov r8, [r8+rcx*8]
mov rax, [r8+rdx*8]
test rax, rax
jz short 0f
ret
0:
mov rcx, r10
mov rdx, r11
jmp \not_found
.Ltagged_pointer_\name:
xor rcx, objc_tagged_pointer_secret
and cl, 0xE
movzx r8, cl
mov r8, [objc_tagged_pointer_classes+r8*4]
mov r8, [r8+56]
jmp short .Lmain_\name
.endm
.macro generate_lookup_super name lookup
\name:
mov r8, rcx
mov rcx, [rcx]
test rcx, rcx
jz short ret_nil
mov r8, [r8+8]
mov r8, [r8+56]
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:
mov rax, offset nil_method
ret
nil_method:
xor rax, rax
ret