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#include "config.h"

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

.intel_syntax

/* Work around assembler bugs. */
.macro jmp
	.att_syntax
	/* Use uppercase instruction to avoid recursion. */
	JMP	$0
	.intel_syntax noprefix
.endmacro
.macro jz
	.att_syntax
	/* Use uppercase instruction to avoid recursion. */
	JZ	$0
	.intel_syntax noprefix
.endmacro

.section __TEXT, __text, regular, pure_instructions
.macro GENERATE_LOOKUP
$0:
	testq	%rdi, %rdi
	test	rdi, rdi
	jz	returnNilMethod

	testb	$$1, %dil
	test	dil, 1
	jnz	LtaggedPointer_$0

	movq	(%rdi), %r8
	movq	64(%r8), %r8
	mov	r8, [rdi]
	mov	r8, [r8 + 64]

Lmain_$0:
	movq	(%rsi), %rax
	movzbl	%ah, %ecx
	movzbl	%al, %edx
	mov	rax, [rsi]
	movzx	ecx, ah
	movzx	edx, al
#ifdef OF_SELUID24
	shrl	$$16, %eax
	shr	eax, 16

	movq	(%r8,%rax,8), %r8
	mov	r8, [r8 + 8 * rax]
#endif
	movq	(%r8,%rcx,8), %r8
	movq	(%r8,%rdx,8), %rax
	movq	r8, [r8 + 8 * rcx]
	movq	rax, [r8 + 8 * rdx]

	testq	%rax, %rax
	test	rax, rax
	jz	$1

	ret

LtaggedPointer_$0:
	movq	_objc_taggedPointerSecret@GOTPCREL(%rip), %rax
	xorq	(%rax), %rdi
	andb	$$0xE, %dil
	movzbl	%dil, %r8d
	mov	rax, [rip + _objc_taggedPointerSecret@GOTPCREL]
	xor	rdi, [rax]
	andb	dil, 0xE
	movzx	r8d, dil

	movq	_objc_taggedPointerClasses@GOTPCREL(%rip), %rax
	movq	(%rax,%r8,4), %r8
	movq	64(%r8), %r8
	mov	rax, [rip + _objc_taggedPointerClasses@GOTPCREL]
	mov	r8, [rax + 4 * r8]
	mov	r8, [r8 + 64]

	jmp	Lmain_$0
.endmacro

.macro GENERATE_LOOKUP_SUPER
$0:
	movq	%rdi, %r8
	movq	(%rdi), %rdi
	testq	%rdi, %rdi
	mov	r8, rdi
	mov	rdi, [rdi]
	test	rdi, rdi
	jz	returnNilMethod

	movq	8(%r8), %r8
	movq	64(%r8), %r8
	movq	r8, [r8 + 8]
	movq	r8, [r8 + 64]
	jmp	Lmain_$1
.endmacro

GENERATE_LOOKUP _objc_msg_lookup, _objc_methodNotFound
GENERATE_LOOKUP _objc_msg_lookup_stret, _objc_methodNotFound_stret
GENERATE_LOOKUP_SUPER _objc_msg_lookup_super, _objc_msg_lookup
GENERATE_LOOKUP_SUPER _objc_msg_lookup_super_stret, _objc_msg_lookup_stret

returnNilMethod:
	leaq	nilMethod(%rip), %rax
	lea	rax, [rip + nilMethod]
	ret

nilMethod:
	xorq	%rax, %rax
	xor	rax, rax
	ret
Fossil 2.23 [47362306a7] 2023-11-01 18:56:47
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