ObjFW  Diff

 * file.
 */

#include "config.h"

#include "platform.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 notFound
\name:
	testq	%rdi, %rdi
	jz	returnNilMethod
	test	rdi, rdi
	jz	short returnNilMethod

	testb	$1, %dil
	jnz	.LtaggedPointer_\name
	test	dil, 1
	jnz	short .LtaggedPointer_\name

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

.Lmain_\name:
	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
	mov	r8, [r8 + 8 * rcx]
	mov	rax, [r8 + 8 * rdx]

	testq	%rax, %rax
	jz	\notFound@PLT
	test	rax, rax
	jz	short \notFound@PLT

	ret

.LtaggedPointer_\name:
	movq	objc_taggedPointerSecret@GOTPCREL(%rip), %rax
	xorq	(%rax), %rdi
	andb	$0xE, %dil
	movzbl	%dil, %r8d
	mov	rax, [rip + objc_taggedPointerSecret@GOTPCREL]
	xor	rdi, [rax]
	and	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_\name
	jmp	short .Lmain_\name
.type \name, %function
.size \name, .-\name
.endm

.macro GENERATE_LOOKUP_SUPER name lookup
\name:
	movq	%rdi, %r8
	movq	(%rdi), %rdi
	testq	%rdi, %rdi
	jz	returnNilMethod
	mov	r8, rdi
	mov	rdi, [rdi]
	test	rdi, rdi
	jz	short returnNilMethod

	movq	8(%r8), %r8
	movq	64(%r8), %r8
	jmp	.Lmain_\lookup
	mov	r8, [r8 + 8]
	mov	r8, [r8 + 64]
	jmp	short .Lmain_\lookup
.type \name, %function
.size \name, .-\name
.endm

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

#if defined(OF_LINUX) || defined(OF_HAIKU) || defined(OF_HURD)
.section .note.GNU-stack, "", %progbits
#endif