gotosocial/vendor/modernc.org/libc/watch.go

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// Copyright 2021 The Libc Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package libc // import "modernc.org/libc"
import (
"fmt"
"math"
"os"
"sync"
"unsafe"
)
var (
watches = map[uintptr]watch{}
watchesMu sync.Mutex
)
type watch interface {
msg() string
}
type watcher string
func (w watcher) msg() string {
if w == "" {
return ""
}
return fmt.Sprintf(": %s", w)
}
type watchInt8 struct {
val int8
watcher
}
func WatchInt8(p uintptr, msg string) {
watchesMu.Lock()
watches[p] = &watchInt8{*(*int8)(unsafe.Pointer(p)), watcher(msg)}
watchesMu.Unlock()
}
type watchUint8 struct {
val uint8
watcher
}
func WatchUint8(p uintptr, msg string) {
watchesMu.Lock()
watches[p] = &watchUint8{*(*uint8)(unsafe.Pointer(p)), watcher(msg)}
watchesMu.Unlock()
}
type watchInt16 struct {
val int16
watcher
}
func WatchInt16(p uintptr, msg string) {
watchesMu.Lock()
watches[p] = &watchInt16{*(*int16)(unsafe.Pointer(p)), watcher(msg)}
watchesMu.Unlock()
}
type watchUint16 struct {
val uint16
watcher
}
func WatchUint16(p uintptr, msg string) {
watchesMu.Lock()
watches[p] = &watchUint16{*(*uint16)(unsafe.Pointer(p)), watcher(msg)}
watchesMu.Unlock()
}
type watchInt32 struct {
val int32
watcher
}
func WatchInt32(p uintptr, msg string) {
watchesMu.Lock()
watches[p] = &watchInt32{*(*int32)(unsafe.Pointer(p)), watcher(msg)}
watchesMu.Unlock()
}
type watchUint32 struct {
val uint32
watcher
}
func WatchUint32(p uintptr, msg string) {
watchesMu.Lock()
watches[p] = &watchUint32{*(*uint32)(unsafe.Pointer(p)), watcher(msg)}
watchesMu.Unlock()
}
type watchInt64 struct {
val int64
watcher
}
func WatchInt64(p uintptr, msg string) {
watchesMu.Lock()
watches[p] = &watchInt64{*(*int64)(unsafe.Pointer(p)), watcher(msg)}
watchesMu.Unlock()
}
type watchUint64 struct {
val uint64
watcher
}
func WatchUint64(p uintptr, msg string) {
watchesMu.Lock()
watches[p] = &watchUint64{*(*uint64)(unsafe.Pointer(p)), watcher(msg)}
watchesMu.Unlock()
}
type watchFloat32 struct {
val float32
watcher
}
func WatchFloat32(p uintptr, msg string) {
watchesMu.Lock()
watches[p] = &watchFloat32{*(*float32)(unsafe.Pointer(p)), watcher(msg)}
watchesMu.Unlock()
}
type watchFloat64 struct {
val float64
watcher
}
func WatchFloat64(p uintptr, msg string) {
watchesMu.Lock()
watches[p] = &watchFloat64{*(*float64)(unsafe.Pointer(p)), watcher(msg)}
watchesMu.Unlock()
}
type watchPtr struct {
val uintptr
watcher
}
func WatchPtr(p uintptr, msg string) {
watchesMu.Lock()
watches[p] = &watchPtr{*(*uintptr)(unsafe.Pointer(p)), watcher(msg)}
watchesMu.Unlock()
}
func Watch() {
watchesMu.Lock()
flush := false
for p, v := range watches {
switch x := v.(type) {
case *watchInt8:
if val := *(*int8)(unsafe.Pointer(p)); val != x.val {
flush = true
fmt.Fprintf(os.Stderr, "%v: int8@%#x was %d, new %d%s\n", origin(2), p, x.val, val, x.msg())
x.val = val
}
case *watchUint8:
if val := *(*uint8)(unsafe.Pointer(p)); val != x.val {
flush = true
fmt.Fprintf(os.Stderr, "%v: uint8@%#x was %d, new %d%s\n", origin(2), p, x.val, val, x.msg())
x.val = val
}
case *watchInt16:
if val := *(*int16)(unsafe.Pointer(p)); val != x.val {
flush = true
fmt.Fprintf(os.Stderr, "%v: int16@%#x was %d, new %d%s\n", origin(2), p, x.val, val, x.msg())
x.val = val
}
case *watchUint16:
if val := *(*uint16)(unsafe.Pointer(p)); val != x.val {
flush = true
fmt.Fprintf(os.Stderr, "%v: uint16@%#x was %d, new %d%s\n", origin(2), p, x.val, val, x.msg())
x.val = val
}
case *watchInt32:
if val := *(*int32)(unsafe.Pointer(p)); val != x.val {
flush = true
fmt.Fprintf(os.Stderr, "%v: int32@%#x was %d, new %d%s\n", origin(2), p, x.val, val, x.msg())
x.val = val
}
case *watchUint32:
if val := *(*uint32)(unsafe.Pointer(p)); val != x.val {
flush = true
fmt.Fprintf(os.Stderr, "%v: uint32@%#x was %d, new %d%s\n", origin(2), p, x.val, val, x.msg())
x.val = val
}
case *watchInt64:
if val := *(*int64)(unsafe.Pointer(p)); val != x.val {
flush = true
fmt.Fprintf(os.Stderr, "%v: int64@%#x was %d, new %d%s\n", origin(2), p, x.val, val, x.msg())
x.val = val
}
case *watchUint64:
if val := *(*uint64)(unsafe.Pointer(p)); val != x.val {
flush = true
fmt.Fprintf(os.Stderr, "%v: uint64@%#x was %d, new %d%s\n", origin(2), p, x.val, val, x.msg())
x.val = val
}
case *watchFloat32:
if val := *(*float32)(unsafe.Pointer(p)); math.Float32bits(val) != math.Float32bits(x.val) {
flush = true
fmt.Fprintf(os.Stderr, "%v: float32@%#x was %v(%#x), new %v(%#x)%s\n", origin(2), p, x.val, math.Float32bits(x.val), val, math.Float32bits(val), x.msg())
x.val = val
}
case *watchFloat64:
if val := *(*float64)(unsafe.Pointer(p)); math.Float64bits(val) != math.Float64bits(x.val) {
flush = true
fmt.Fprintf(os.Stderr, "%v: float64@%#x was %v(%#x), new %v(%#x)%s\n", origin(2), p, x.val, math.Float64bits(x.val), val, math.Float64bits(val), x.msg())
x.val = val
}
case *watchPtr:
if val := *(*uintptr)(unsafe.Pointer(p)); val != x.val {
flush = true
fmt.Fprintf(os.Stderr, "%v: ptr@%#x was %#x, new %#x%s\n", origin(2), p, x.val, val, x.msg())
x.val = val
}
default:
panic(todo("%T", x))
}
}
if flush {
os.Stderr.Sync()
}
watchesMu.Unlock()
}
func WatchDelete(p uintptr) {
watchesMu.Lock()
delete(watches, p)
watchesMu.Unlock()
}