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debug.go
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debug.go
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// Copyright 2020 Douyu
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package xdebug
import (
"bytes"
"os"
"runtime"
)
// PanicTrace trace panic stack info.
func PanicTrace(kb int) []byte {
s := []byte("/src/runtime/panic.go")
e := []byte("\ngoroutine ")
line := []byte("\n")
stack := make([]byte, kb<<10) // 4KB
length := runtime.Stack(stack, true)
start := bytes.Index(stack, s)
stack = stack[start:length]
start = bytes.Index(stack, line) + 1
stack = stack[start:]
end := bytes.LastIndex(stack, line)
if end != -1 {
stack = stack[:end]
}
end = bytes.Index(stack, e)
if end != -1 {
stack = stack[:end]
}
stack = bytes.TrimRight(stack, "\n")
return stack
}
// DumpPanicTrace trace panic stack info.
func DumpPanicTrace(kb int) {
s := []byte("/src/runtime/panic.go")
e := []byte("\ngoroutine ")
line := []byte("\n")
stack := make([]byte, kb<<10) // 4KB
length := runtime.Stack(stack, true)
start := bytes.Index(stack, s)
stack = stack[start:length]
start = bytes.Index(stack, line) + 1
stack = stack[start:]
end := bytes.LastIndex(stack, line)
if end != -1 {
stack = stack[:end]
}
end = bytes.Index(stack, e)
if end != -1 {
stack = stack[:end]
}
_, _ = os.Stdout.Write(bytes.TrimRight(stack, "\n"))
}