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// Copyright 2022 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 (
"bytes"
"fmt"
"math"
"runtime/debug"
"sort"
"strings"
"sync"
"sync/atomic"
"github.com/dustin/go-humanize"
)
type PerfCounter struct {
a []int32
labels []string
enabled bool
}
func NewPerfCounter(labels []string) *PerfCounter {
return &PerfCounter{
a: make([]int32, len(labels)),
labels: labels,
enabled: true,
}
}
func (c *PerfCounter) Disable() { c.enabled = false }
func (c *PerfCounter) Enable() { c.enabled = true }
func (c *PerfCounter) Clear() {
for i := range c.a {
c.a[i] = 0
}
}
func (c *PerfCounter) Inc(n int) {
if c.enabled {
atomic.AddInt32(&c.a[n], 1)
}
}
func (c *PerfCounter) IncN(n, m int) {
if c.enabled {
atomic.AddInt32(&c.a[n], int32(m))
}
}
func (c *PerfCounter) String() string {
sv := c.enabled
defer func() { c.enabled = sv }()
c.enabled = false
var a []string
for i, v := range c.a {
if v != 0 {
a = append(a, fmt.Sprintf("%q: %s", c.labels[i], h(v)))
}
}
return fmt.Sprint(a)
}
func h(v interface{}) string {
switch x := v.(type) {
case int:
return humanize.Comma(int64(x))
case int32:
return humanize.Comma(int64(x))
case int64:
return humanize.Comma(x)
case uint32:
return humanize.Comma(int64(x))
case uint64:
if x <= math.MaxInt64 {
return humanize.Comma(int64(x))
}
return "-" + humanize.Comma(-int64(x))
}
return fmt.Sprint(v)
}
type StackCapture struct {
sync.Mutex
m map[string]int
depth int
enabled bool
}
func NewStackCapture(depth int) *StackCapture {
return &StackCapture{
m: map[string]int{},
depth: depth,
enabled: true,
}
}
func (c *StackCapture) Disable() { c.enabled = false }
func (c *StackCapture) Enable() { c.enabled = true }
func (c *StackCapture) Clear() {
c.Lock()
defer c.Unlock()
c.m = map[string]int{}
}
var (
stackCapturePrefix = []byte("\n\t")
)
func (c *StackCapture) Record() {
if !c.enabled {
return
}
b := debug.Stack()
var s strings.Builder
out:
for i := 0; len(b) > 0 && i < c.depth+2; i++ {
l := bytes.Index(b, stackCapturePrefix)
if l < 0 {
break out
}
b = b[l+len(stackCapturePrefix):]
h := bytes.IndexByte(b, '\n')
if h < 0 {
h = len(b)
}
if i > 1 {
fmt.Fprintf(&s, "\n\t%s", b[:h])
}
b = b[h:]
}
c.Lock()
defer c.Unlock()
c.m[s.String()]++
}
func (c *StackCapture) String() string {
c.Lock()
defer c.Unlock()
var b strings.Builder
var a []string
for k := range c.m {
a = append(a, k)
}
sort.Slice(a, func(i, j int) bool { return c.m[a[i]] < c.m[a[j]] })
for _, k := range a {
fmt.Fprintf(&b, "%d%s\n", c.m[k], k)
}
return b.String()
}
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