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
159
160
161
162
|
module builtin
[unsafe]
pub fn memcpy(dest &C.void, src &C.void, n size_t) &C.void {
dest_ := unsafe { &byte(dest) }
src_ := unsafe { &byte(src) }
unsafe {
for i in 0 .. int(n) {
dest_[i] = src_[i]
}
}
return unsafe { dest }
}
[export: 'malloc']
[unsafe]
fn __malloc(n size_t) &C.void {
return unsafe { malloc(int(n)) }
}
[unsafe]
fn strlen(_s &C.void) size_t {
s := unsafe { &byte(_s) }
mut i := 0
for ; unsafe { s[i] } != 0; i++ {}
return size_t(i)
}
[unsafe]
fn realloc(old_area &C.void, new_size size_t) &C.void {
if old_area == 0 {
return unsafe { malloc(int(new_size)) }
}
if new_size == size_t(0) {
unsafe { free(old_area) }
return 0
}
old_size := unsafe { *(&u64(old_area - sizeof(u64))) }
if u64(new_size) <= old_size {
return unsafe { old_area }
} else {
new_area := unsafe { malloc(int(new_size)) }
unsafe { memmove(new_area, old_area, size_t(old_size)) }
unsafe { free(old_area) }
return new_area
}
}
[unsafe]
fn memset(s &C.void, c int, n size_t) &C.void {
mut s_ := unsafe { &char(s) }
for i in 0 .. int(n) {
unsafe {
s_[i] = char(c)
}
}
return unsafe { s }
}
[unsafe]
fn memmove(dest &C.void, src &C.void, n size_t) &C.void {
dest_ := unsafe { &byte(dest) }
src_ := unsafe { &byte(src) }
mut temp_buf := unsafe { malloc(int(n)) }
for i in 0 .. int(n) {
unsafe {
temp_buf[i] = src_[i]
}
}
for i in 0 .. int(n) {
unsafe {
dest_[i] = temp_buf[i]
}
}
unsafe { free(temp_buf) }
return unsafe { dest }
}
[export: 'calloc']
[unsafe]
fn __calloc(nmemb size_t, size size_t) &C.void {
new_area := unsafe { malloc(int(nmemb) * int(size)) }
unsafe { memset(new_area, 0, nmemb * size) }
return new_area
}
fn getchar() int {
x := byte(0)
sys_read(0, &x, 1)
return int(x)
}
fn memcmp(a &C.void, b &C.void, n size_t) int {
a_ := unsafe { &byte(a) }
b_ := unsafe { &byte(b) }
for i in 0 .. int(n) {
if unsafe { a_[i] != b_[i] } {
unsafe {
return a_[i] - b_[i]
}
}
}
return 0
}
[export: 'free']
[unsafe]
fn __free(ptr &C.void) {
err := mm_free(ptr)
if err != .enoerror {
eprintln('free error:')
panic(err)
}
}
fn vsprintf(str &char, format &char, ap &byte) int {
panic('vsprintf(): string interpolation is not supported in `-freestanding`')
}
fn vsnprintf(str &char, size size_t, format &char, ap &byte) int {
panic('vsnprintf(): string interpolation is not supported in `-freestanding`')
}
// not really needed
fn bare_read(buf &byte, count u64) (i64, Errno) {
return sys_read(0, buf, count)
}
fn bare_print(buf &byte, len u64) {
sys_write(1, buf, len)
}
fn bare_eprint(buf &byte, len u64) {
sys_write(2, buf, len)
}
pub fn write(fd i64, buf &byte, count u64) i64 {
x, _ := sys_write(fd, buf, count)
return x
}
[noreturn]
fn bare_panic(msg string) {
println('V panic' + msg)
exit(1)
}
fn bare_backtrace() string {
return 'backtraces are not available with `-freestanding`'
}
[export: 'exit']
[noreturn]
fn __exit(code int) {
sys_exit(code)
}
[export: 'qsort']
fn __qsort(base voidptr, nmemb size_t, size size_t, sort_cb FnSortCB) {
panic('qsort() is not yet implemented in `-freestanding`')
}
|
