17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
-
+
-
+
-
+
|
.globl _objc_msg_lookup
.globl _objc_msg_lookup_stret
.globl _objc_msg_lookup_super
.globl _objc_msg_lookup_super_stret
.section __TEXT, __text, regular, pure_instructions
.macro generate_lookup
.macro GENERATE_LOOKUP
$0:
testq %rdi, %rdi
jz ret_nil
jz returnNilMethod
testb $$1, %dil
jnz Ltagged_pointer_$0
jnz LtaggedPointer_$0
movq (%rdi), %r8
movq 64(%r8), %r8
Lmain_$0:
movq (%rsi), %rax
movzbl %ah, %ecx
|
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
-
-
+
+
-
+
-
+
-
+
-
-
-
-
+
+
+
+
-
-
+
+
-
+
|
movq (%r8,%rdx,8), %rax
testq %rax, %rax
jz $1
ret
Ltagged_pointer_$0:
movq _objc_tagged_pointer_secret@GOTPCREL(%rip), %rax
LtaggedPointer_$0:
movq _objc_taggedPointerSecret@GOTPCREL(%rip), %rax
xorq (%rax), %rdi
andb $$0xE, %dil
movzbl %dil, %r8d
movq _objc_tagged_pointer_classes@GOTPCREL(%rip), %rax
movq _objc_taggedPointerClasses@GOTPCREL(%rip), %rax
movq (%rax,%r8,4), %r8
movq 64(%r8), %r8
jmp Lmain_$0
.endmacro
.macro generate_lookup_super
.macro GENERATE_LOOKUP_SUPER
$0:
movq %rdi, %r8
movq (%rdi), %rdi
testq %rdi, %rdi
jz ret_nil
jz returnNilMethod
movq 8(%r8), %r8
movq 64(%r8), %r8
jmp Lmain_$1
.endmacro
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:
leaq nil_method(%rip), %rax
returnNilMethod:
leaq nilMethod(%rip), %rax
ret
nil_method:
nilMethod:
xorq %rax, %rax
ret
|