ObjFW  Diff

 * 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 notFound
\name:
	testq	%rcx, %rcx
	jz	returnNilMethod
	test	rcx, rcx
	jz	short returnNilMethod

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

	movq	(%rcx), %r8
	movq	56(%r8), %r8
	mov	r8, [rcx]
	mov	r8, [r8 + 56]

.Lmain_\name:
	movq	%rcx, %r10
	movq	%rdx, %r11
	mov	r10, rcx
	mov	r11, rdx

	movq	(%rdx), %rax
	movzbl	%ah, %ecx
	movzbl	%al, %edx
	mov	rax, [rdx]
	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	0f
	test	rax, rax
	jz	short 0f

	ret

0:
	movq	%r10, %rcx
	movq	%r11, %rdx
	jmp	\notFound
	mov	rcx, r10
	mov	rdx, r11
	jmp	short \notFound

.LtaggedPointer_\name:
	xorq	objc_taggedPointerSecret(%rip), %rcx
	andb	$0xE, %cl
	movzbl	%cl, %r8d
	xor	rcx, [rip + objc_taggedPointerSecret]
	and	cl, 0xE
	movzx	r8d, cl

	leaq	objc_taggedPointerClasses(%rip), %rax
	movq	(%rax,%r8,4), %r8
	movq	56(%r8), %r8
	lea	rax, [rip + objc_taggedPointerClasses]
	mov	r8, [rax + 4 * r8]
	mov	r8, [r8 + 56]

	jmp	.Lmain_\name
	jmp	short .Lmain_\name
.def \name
.scl 2
.type 32
.endef
.endm

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

	movq	8(%r8), %r8
	movq	56(%r8), %r8
	jmp	.Lmain_\lookup
	mov	r8, [r8 + 8]
	mov	r8, [r8 + 56]
	jmp	short .Lmain_\lookup
.def \name
.scl 2
.type 32
.endef
.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