mirror of
https://github.com/tinygo-org/tinygo.git
synced 2026-08-04 02:57:46 +00:00
Ayke van Laethem
405c0263b0
This function adjusts the time returned by time.Now() and similar functions. This is necessary on bare metal systems, where there would not be a way to adjust the time otherwise.
117 lines
2.8 KiB
Go
117 lines
2.8 KiB
Go
package runtime
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import (
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"unsafe"
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)
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const Compiler = "tinygo"
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// The compiler will fill this with calls to the initialization function of each
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// package.
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func initAll()
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// A function call to this function is replaced with one of the following,
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// depending on whether the scheduler is necessary:
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//
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// Without scheduler:
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//
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// main.main()
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//
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// With scheduler:
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//
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// main.main()
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// scheduler()
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func callMain()
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func GOMAXPROCS(n int) int {
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// Note: setting GOMAXPROCS is ignored.
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return 1
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}
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func GOROOT() string {
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// TODO: don't hardcode but take the one at compile time.
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return "/usr/local/go"
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}
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//go:linkname os_runtime_args os.runtime_args
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func os_runtime_args() []string {
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return nil
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}
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// Copy size bytes from src to dst. The memory areas must not overlap.
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func memcpy(dst, src unsafe.Pointer, size uintptr) {
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for i := uintptr(0); i < size; i++ {
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*(*uint8)(unsafe.Pointer(uintptr(dst) + i)) = *(*uint8)(unsafe.Pointer(uintptr(src) + i))
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}
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}
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// Copy size bytes from src to dst. The memory areas may overlap and will do the
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// correct thing.
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func memmove(dst, src unsafe.Pointer, size uintptr) {
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if uintptr(dst) < uintptr(src) {
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// Copy forwards.
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memcpy(dst, src, size)
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return
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}
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// Copy backwards.
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for i := size; i != 0; {
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i--
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*(*uint8)(unsafe.Pointer(uintptr(dst) + i)) = *(*uint8)(unsafe.Pointer(uintptr(src) + i))
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}
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}
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// Set the given number of bytes to zero.
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func memzero(ptr unsafe.Pointer, size uintptr) {
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for i := uintptr(0); i < size; i++ {
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*(*byte)(unsafe.Pointer(uintptr(ptr) + i)) = 0
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}
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}
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// Compare two same-size buffers for equality.
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func memequal(x, y unsafe.Pointer, n uintptr) bool {
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for i := uintptr(0); i < n; i++ {
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cx := *(*uint8)(unsafe.Pointer(uintptr(x) + i))
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cy := *(*uint8)(unsafe.Pointer(uintptr(y) + i))
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if cx != cy {
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return false
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}
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}
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return true
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}
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func nanotime() int64 {
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return int64(ticks()) * tickMicros
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}
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// timeOffset is how long the monotonic clock started after the Unix epoch. It
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// should be a positive integer under normal operation or zero when it has not
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// been set.
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var timeOffset int64
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//go:linkname now time.now
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func now() (sec int64, nsec int32, mono int64) {
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mono = nanotime()
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sec = (mono + timeOffset) / (1000 * 1000 * 1000)
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nsec = int32((mono + timeOffset) - sec*(1000*1000*1000))
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return
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}
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// AdjustTimeOffset adds the given offset to the built-in time offset. A
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// positive value adds to the time (skipping some time), a negative value moves
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// the clock into the past.
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func AdjustTimeOffset(offset int64) {
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// TODO: do this atomically?
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timeOffset += offset
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}
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// Copied from the Go runtime source code.
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//go:linkname os_sigpipe os.sigpipe
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func os_sigpipe() {
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runtimePanic("too many writes on closed pipe")
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}
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//go:linkname syscall_runtime_envs syscall.runtime_envs
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func syscall_runtime_envs() []string {
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return nil
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}
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