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
|
//go:build tinygo.wasm && !wasm_unknown && !wasip2
package runtime
import (
"unsafe"
)
// Implements __wasi_iovec_t.
type __wasi_iovec_t struct {
buf unsafe.Pointer
bufLen uint
}
//go:wasmimport wasi_snapshot_preview1 fd_write
func fd_write(id uint32, iovs *__wasi_iovec_t, iovs_len uint, nwritten *uint) (errno uint)
// See:
// https://github.com/WebAssembly/WASI/blob/main/phases/snapshot/docs.md#-proc_exitrval-exitcode
//
//go:wasmimport wasi_snapshot_preview1 proc_exit
func proc_exit(exitcode uint32)
const (
putcharBufferSize = 120
stdout = 1
)
// Using global variables to avoid heap allocation.
var (
putcharBuffer = [putcharBufferSize]byte{}
putcharPosition uint = 0
putcharIOVec = __wasi_iovec_t{
buf: unsafe.Pointer(&putcharBuffer[0]),
}
putcharNWritten uint
)
func putchar(c byte) {
putcharBuffer[putcharPosition] = c
putcharPosition++
if c == '\n' || putcharPosition >= putcharBufferSize {
putcharIOVec.bufLen = putcharPosition
fd_write(stdout, &putcharIOVec, 1, &putcharNWritten)
putcharPosition = 0
}
}
func getchar() byte {
// dummy, TODO
return 0
}
func buffered() int {
// dummy, TODO
return 0
}
//go:linkname now time.now
func now() (sec int64, nsec int32, mono int64) {
mono = nanotime()
sec = mono / (1000 * 1000 * 1000)
nsec = int32(mono - sec*(1000*1000*1000))
return
}
// Abort executes the wasm 'unreachable' instruction.
func abort() {
trap()
}
//go:linkname syscall_Exit syscall.Exit
func syscall_Exit(code int) {
proc_exit(uint32(code))
}
// TinyGo does not yet support any form of parallelism on WebAssembly, so these
// can be left empty.
//go:linkname procPin sync/atomic.runtime_procPin
func procPin() {
}
//go:linkname procUnpin sync/atomic.runtime_procUnpin
func procUnpin() {
}
func hardwareRand() (n uint64, ok bool) {
n |= uint64(libc_arc4random())
n |= uint64(libc_arc4random()) << 32
return n, true
}
// uint32_t arc4random(void);
//
//export arc4random
func libc_arc4random() uint32
|
