forked from p85947160/gitea
86 lines
2.7 KiB
Go
86 lines
2.7 KiB
Go
// Copyright (c) 2016 Uber Technologies, Inc.
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
// THE SOFTWARE.
|
|
|
|
package zap
|
|
|
|
import (
|
|
"runtime"
|
|
"sync"
|
|
|
|
"go.uber.org/zap/internal/bufferpool"
|
|
)
|
|
|
|
var (
|
|
_stacktracePool = sync.Pool{
|
|
New: func() interface{} {
|
|
return newProgramCounters(64)
|
|
},
|
|
}
|
|
)
|
|
|
|
func takeStacktrace(skip int) string {
|
|
buffer := bufferpool.Get()
|
|
defer buffer.Free()
|
|
programCounters := _stacktracePool.Get().(*programCounters)
|
|
defer _stacktracePool.Put(programCounters)
|
|
|
|
var numFrames int
|
|
for {
|
|
// Skip the call to runtime.Callers and takeStacktrace so that the
|
|
// program counters start at the caller of takeStacktrace.
|
|
numFrames = runtime.Callers(skip+2, programCounters.pcs)
|
|
if numFrames < len(programCounters.pcs) {
|
|
break
|
|
}
|
|
// Don't put the too-short counter slice back into the pool; this lets
|
|
// the pool adjust if we consistently take deep stacktraces.
|
|
programCounters = newProgramCounters(len(programCounters.pcs) * 2)
|
|
}
|
|
|
|
i := 0
|
|
frames := runtime.CallersFrames(programCounters.pcs[:numFrames])
|
|
|
|
// Note: On the last iteration, frames.Next() returns false, with a valid
|
|
// frame, but we ignore this frame. The last frame is a a runtime frame which
|
|
// adds noise, since it's only either runtime.main or runtime.goexit.
|
|
for frame, more := frames.Next(); more; frame, more = frames.Next() {
|
|
if i != 0 {
|
|
buffer.AppendByte('\n')
|
|
}
|
|
i++
|
|
buffer.AppendString(frame.Function)
|
|
buffer.AppendByte('\n')
|
|
buffer.AppendByte('\t')
|
|
buffer.AppendString(frame.File)
|
|
buffer.AppendByte(':')
|
|
buffer.AppendInt(int64(frame.Line))
|
|
}
|
|
|
|
return buffer.String()
|
|
}
|
|
|
|
type programCounters struct {
|
|
pcs []uintptr
|
|
}
|
|
|
|
func newProgramCounters(size int) *programCounters {
|
|
return &programCounters{make([]uintptr, size)}
|
|
}
|