blob: 84642def26ab9a1d9ff7edb5df3073f1e1c7b81b (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
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
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
# Some unsafe methods not intended to be used directly in SubX, only through
# Mu after proper type-checking.
== code
stream-empty?: # s: (addr stream _) -> result/eax: boolean
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
51/push-ecx
56/push-esi
# result = false
b8/copy-to-eax 0/imm32/false
# esi = s
8b/-> *(ebp+8) 6/r32/esi
# return s->read >= s->write
8b/-> *esi 1/r32/ecx
39/compare-with *(esi+4) 1/r32/ecx
0f 9d/set-if->= %al
$stream-empty?:end:
# . restore registers
5e/pop-to-esi
59/pop-to-ecx
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
stream-full?: # s: (addr stream _) -> result/eax: boolean
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
51/push-ecx
56/push-esi
# result = false
b8/copy-to-eax 0/imm32/false
# esi = s
8b/-> *(ebp+8) 6/r32/esi
# return s->write >= s->size
8b/-> *(esi+8) 1/r32/ecx
39/compare-with *esi 1/r32/ecx
0f 9d/set-if->= %al
$stream-full?:end:
# . restore registers
5e/pop-to-esi
59/pop-to-ecx
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
write-to-stream: # s: (addr stream _), in: (addr byte), n: int
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
50/push-eax
51/push-ecx
52/push-edx
53/push-ebx
57/push-edi
# edi = s
8b/-> *(ebp+8) 7/r32/edi
# var swrite/edx: int = s->write
8b/-> *edi 2/r32/edx
# if (swrite + n > s->size) abort
8b/-> *(ebp+0x10) 1/r32/ecx
01/add-to %ecx 2/r32/edx
3b/compare 1/r32/ecx *(edi+8)
0f 8f/jump-if-> $write-to-stream:abort/disp32
# var out/edx: (addr byte) = s->data + s->write
8d/copy-address *(edi+edx+0xc) 2/r32/edx
# var outend/ebx: (addr byte) = out + n
8b/-> *(ebp+0x10) 3/r32/ebx
8d/copy-address *(edx+ebx) 3/r32/ebx
# eax = in
8b/-> *(ebp+0xc) 0/r32/eax
# var inend/ecx: (addr byte) = in + n
8b/-> *(ebp+0x10) 1/r32/ecx
8d/copy-address *(eax+ecx) 1/r32/ecx
#
(_append-4 %edx %ebx %eax %ecx) # => eax
# s->write += n
8b/-> *(ebp+0x10) 1/r32/ecx
01/add-to *edi 1/r32/ecx
$write-to-stream:end:
# . restore registers
5f/pop-to-edi
5b/pop-to-ebx
5a/pop-to-edx
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
$write-to-stream:abort:
(write-buffered Stderr "write-to-stream: stream full\n")
(flush Stderr)
bb/copy-to-ebx 1/imm32
(syscall_exit)
# never gets here
read-from-stream: # s: (addr stream _), out: (addr byte), n: int
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
50/push-eax
51/push-ecx
52/push-edx
53/push-ebx
56/push-esi
# esi = s
8b/-> *(ebp+8) 6/r32/esi
# var sread/edx: int = s->read
8b/-> *(esi+4) 2/r32/edx
# if (sread + n > s->write) abort
8b/-> *(ebp+0x10) 1/r32/ecx
01/add-to %ecx 2/r32/edx
3b/compare 1/r32/ecx *esi
0f 8f/jump-if-> $read-from-stream:abort/disp32
# var in/edx: (addr byte) = s->data + s->read
8d/copy-address *(esi+edx+0xc) 2/r32/edx
# var inend/ebx: (addr byte) = in + n
8b/-> *(ebp+0x10) 3/r32/ebx
8d/copy-address *(edx+ebx) 3/r32/ebx
# eax = out
8b/-> *(ebp+0xc) 0/r32/eax
# var outend/ecx: (addr byte) = out + n
8b/-> *(ebp+0x10) 1/r32/ecx
8d/copy-address *(eax+ecx) 1/r32/ecx
#
(_append-4 %eax %ecx %edx %ebx) # => eax
# s->read += n
8b/-> *(ebp+0x10) 1/r32/ecx
01/add-to *(esi+4) 1/r32/ecx
$read-from-stream:end:
# . restore registers
5e/pop-to-esi
5b/pop-to-ebx
5a/pop-to-edx
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
$read-from-stream:abort:
(write-buffered Stderr "read-from-stream: stream empty\n")
(flush Stderr)
bb/copy-to-ebx 1/imm32
(syscall_exit)
# never gets here
|