12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
-
-
+
-
-
+
+
-
-
-
-
+
+
+
+
-
-
-
+
+
+
-
+
-
-
+
+
-
-
+
+
-
-
-
+
+
+
-
+
-
+
|
* 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.
*/
#if defined(__x86_64__) && defined(__ELF__)
.intel_syntax noprefix
test rdi, rdi
testq %rdi, %rdi
jz ret_nil
mov r8, [rdi]
mov r8, [r8+64]
movq (%rdi), %r8
movq 64(%r8), %r8
lookup:
mov rax, [rsi]
movzx ecx, ah
movzx edx, al
shr eax, 16
movq (%rsi), %rax
movzbl %ah, %ecx
movzbl %al, %edx
shrl $16, %eax
mov r8, [r8+rax*8]
mov r8, [r8+rcx*8]
mov rax, [r8+rdx*8]
movq (%r8,%rax,8), %r8
movq (%r8,%rcx,8), %r8
movq (%r8,%rdx,8), %rax
test rax, rax
testq %rax, %rax
jz forward
ret
forward:
mov rax, qword ptr objc_forward_handler@GOTPCREL[rip]
jmp [rax]
mov objc_forward_handler@GOTPCREL(%rip), %rax
jmp *%rax
objc_msg_lookup_super:
mov rax, [rdi]
test rax, rax
movq (%rdi), %rax
testq %rax, %rax
jz ret_nil
mov r8, [rdi+8]
mov r8, [r8+64]
mov rdi, rax
movq 8(%rdi), %r8
movq 64(%r8), %r8
movq %rdi, %rax
jmp lookup
ret_nil:
lea rax, nil_method[rip]
leaq nil_method(%rip), %rax
ret
nil_method:
mov rax, rdi
movq %rdi, %rax
ret
.type objc_msg_lookup, @function
.type objc_msg_lookup_super, @function
.size objc_msg_lookup, forward-objc_msg_lookup
.size objc_msg_lookup_super, ret_nil-objc_msg_lookup_super
|