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debug.go
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debug.go
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// Copyright 2014 beego Author. All Rights Reserved.
//
// 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 utils
import (
"bytes"
"fmt"
"log"
"reflect"
"runtime"
)
var (
dunno = []byte("???")
centerDot = []byte("·")
dot = []byte(".")
lbr = []byte("{")
lbrn = []byte("{\n")
com = []byte(",")
comn = []byte(",\n")
rbr = []byte("}")
comnrbr = []byte(",\n}")
)
type pointerInfo struct {
prev *pointerInfo
n int
addr uintptr
pos int
used []int
}
// print the data in console
func Display(data ...interface{}) {
display(true, data...)
}
// return data print string
func GetDisplayString(data ...interface{}) string {
return display(false, data...)
}
func display(displayed bool, data ...interface{}) string {
var pc, file, line, ok = runtime.Caller(2)
if !ok {
return ""
}
var buf = new(bytes.Buffer)
fmt.Fprintf(buf, "[Debug] at %s() [%s:%d]\n", function(pc), file, line)
fmt.Fprintf(buf, "\n[Variables]\n")
for i := 0; i < len(data); i += 2 {
var output = fomateinfo(len(data[i].(string))+3, data[i+1])
fmt.Fprintf(buf, "%s = %s", data[i], output)
}
if displayed {
log.Print(buf)
}
return buf.String()
}
// return data dump and format bytes
func fomateinfo(headlen int, data ...interface{}) []byte {
var buf = new(bytes.Buffer)
if len(data) > 1 {
fmt.Fprint(buf, " ")
fmt.Fprint(buf, "[")
fmt.Fprintln(buf)
}
for k, v := range data {
var buf2 = new(bytes.Buffer)
var pointers *pointerInfo
var interfaces []reflect.Value = make([]reflect.Value, 0, 10)
printKeyValue(buf2, reflect.ValueOf(v), &pointers, &interfaces, nil, true, " ", 1)
if k < len(data)-1 {
fmt.Fprint(buf2, ", ")
}
fmt.Fprintln(buf2)
buf.Write(buf2.Bytes())
}
if len(data) > 1 {
fmt.Fprintln(buf)
fmt.Fprint(buf, " ")
fmt.Fprint(buf, "]")
}
return buf.Bytes()
}
// check data is golang basic type
func isSimpleType(val reflect.Value, kind reflect.Kind, pointers **pointerInfo, interfaces *[]reflect.Value) bool {
switch kind {
case reflect.Bool:
return true
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return true
case reflect.Uint8, reflect.Uint16, reflect.Uint, reflect.Uint32, reflect.Uint64:
return true
case reflect.Float32, reflect.Float64:
return true
case reflect.Complex64, reflect.Complex128:
return true
case reflect.String:
return true
case reflect.Chan:
return true
case reflect.Invalid:
return true
case reflect.Interface:
for _, in := range *interfaces {
if reflect.DeepEqual(in, val) {
return true
}
}
return false
case reflect.UnsafePointer:
if val.IsNil() {
return true
}
var elem = val.Elem()
if isSimpleType(elem, elem.Kind(), pointers, interfaces) {
return true
}
var addr = val.Elem().UnsafeAddr()
for p := *pointers; p != nil; p = p.prev {
if addr == p.addr {
return true
}
}
return false
}
return false
}
// dump value
func printKeyValue(buf *bytes.Buffer, val reflect.Value, pointers **pointerInfo, interfaces *[]reflect.Value, structFilter func(string, string) bool, formatOutput bool, indent string, level int) {
var t = val.Kind()
switch t {
case reflect.Bool:
fmt.Fprint(buf, val.Bool())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
fmt.Fprint(buf, val.Int())
case reflect.Uint8, reflect.Uint16, reflect.Uint, reflect.Uint32, reflect.Uint64:
fmt.Fprint(buf, val.Uint())
case reflect.Float32, reflect.Float64:
fmt.Fprint(buf, val.Float())
case reflect.Complex64, reflect.Complex128:
fmt.Fprint(buf, val.Complex())
case reflect.UnsafePointer:
fmt.Fprintf(buf, "unsafe.Pointer(0x%X)", val.Pointer())
case reflect.Ptr:
if val.IsNil() {
fmt.Fprint(buf, "nil")
return
}
var addr = val.Elem().UnsafeAddr()
for p := *pointers; p != nil; p = p.prev {
if addr == p.addr {
p.used = append(p.used, buf.Len())
fmt.Fprintf(buf, "0x%X", addr)
return
}
}
*pointers = &pointerInfo{
prev: *pointers,
addr: addr,
pos: buf.Len(),
used: make([]int, 0),
}
fmt.Fprint(buf, "&")
printKeyValue(buf, val.Elem(), pointers, interfaces, structFilter, formatOutput, indent, level)
case reflect.String:
fmt.Fprint(buf, "\"", val.String(), "\"")
case reflect.Interface:
var value = val.Elem()
if !value.IsValid() {
fmt.Fprint(buf, "nil")
} else {
for _, in := range *interfaces {
if reflect.DeepEqual(in, val) {
fmt.Fprint(buf, "repeat")
return
}
}
*interfaces = append(*interfaces, val)
printKeyValue(buf, value, pointers, interfaces, structFilter, formatOutput, indent, level+1)
}
case reflect.Struct:
var t = val.Type()
fmt.Fprint(buf, t)
fmt.Fprint(buf, "{")
for i := 0; i < val.NumField(); i++ {
if formatOutput {
fmt.Fprintln(buf)
} else {
fmt.Fprint(buf, " ")
}
var name = t.Field(i).Name
if formatOutput {
for ind := 0; ind < level; ind++ {
fmt.Fprint(buf, indent)
}
}
fmt.Fprint(buf, name)
fmt.Fprint(buf, ": ")
if structFilter != nil && structFilter(t.String(), name) {
fmt.Fprint(buf, "ignore")
} else {
printKeyValue(buf, val.Field(i), pointers, interfaces, structFilter, formatOutput, indent, level+1)
}
fmt.Fprint(buf, ",")
}
if formatOutput {
fmt.Fprintln(buf)
for ind := 0; ind < level-1; ind++ {
fmt.Fprint(buf, indent)
}
} else {
fmt.Fprint(buf, " ")
}
fmt.Fprint(buf, "}")
case reflect.Array, reflect.Slice:
fmt.Fprint(buf, val.Type())
fmt.Fprint(buf, "{")
var allSimple = true
for i := 0; i < val.Len(); i++ {
var elem = val.Index(i)
var isSimple = isSimpleType(elem, elem.Kind(), pointers, interfaces)
if !isSimple {
allSimple = false
}
if formatOutput && !isSimple {
fmt.Fprintln(buf)
} else {
fmt.Fprint(buf, " ")
}
if formatOutput && !isSimple {
for ind := 0; ind < level; ind++ {
fmt.Fprint(buf, indent)
}
}
printKeyValue(buf, elem, pointers, interfaces, structFilter, formatOutput, indent, level+1)
if i != val.Len()-1 || !allSimple {
fmt.Fprint(buf, ",")
}
}
if formatOutput && !allSimple {
fmt.Fprintln(buf)
for ind := 0; ind < level-1; ind++ {
fmt.Fprint(buf, indent)
}
} else {
fmt.Fprint(buf, " ")
}
fmt.Fprint(buf, "}")
case reflect.Map:
var t = val.Type()
var keys = val.MapKeys()
fmt.Fprint(buf, t)
fmt.Fprint(buf, "{")
var allSimple = true
for i := 0; i < len(keys); i++ {
var elem = val.MapIndex(keys[i])
var isSimple = isSimpleType(elem, elem.Kind(), pointers, interfaces)
if !isSimple {
allSimple = false
}
if formatOutput && !isSimple {
fmt.Fprintln(buf)
} else {
fmt.Fprint(buf, " ")
}
if formatOutput && !isSimple {
for ind := 0; ind <= level; ind++ {
fmt.Fprint(buf, indent)
}
}
printKeyValue(buf, keys[i], pointers, interfaces, structFilter, formatOutput, indent, level+1)
fmt.Fprint(buf, ": ")
printKeyValue(buf, elem, pointers, interfaces, structFilter, formatOutput, indent, level+1)
if i != val.Len()-1 || !allSimple {
fmt.Fprint(buf, ",")
}
}
if formatOutput && !allSimple {
fmt.Fprintln(buf)
for ind := 0; ind < level-1; ind++ {
fmt.Fprint(buf, indent)
}
} else {
fmt.Fprint(buf, " ")
}
fmt.Fprint(buf, "}")
case reflect.Chan:
fmt.Fprint(buf, val.Type())
case reflect.Invalid:
fmt.Fprint(buf, "invalid")
default:
fmt.Fprint(buf, "unknow")
}
}
// dump pointer value
func printPointerInfo(buf *bytes.Buffer, headlen int, pointers *pointerInfo) {
var anyused = false
var pointerNum = 0
for p := pointers; p != nil; p = p.prev {
if len(p.used) > 0 {
anyused = true
}
pointerNum += 1
p.n = pointerNum
}
if anyused {
var pointerBufs = make([][]rune, pointerNum+1)
for i := 0; i < len(pointerBufs); i++ {
var pointerBuf = make([]rune, buf.Len()+headlen)
for j := 0; j < len(pointerBuf); j++ {
pointerBuf[j] = ' '
}
pointerBufs[i] = pointerBuf
}
for pn := 0; pn <= pointerNum; pn++ {
for p := pointers; p != nil; p = p.prev {
if len(p.used) > 0 && p.n >= pn {
if pn == p.n {
pointerBufs[pn][p.pos+headlen] = '└'
var maxpos = 0
for i, pos := range p.used {
if i < len(p.used)-1 {
pointerBufs[pn][pos+headlen] = '┴'
} else {
pointerBufs[pn][pos+headlen] = '┘'
}
maxpos = pos
}
for i := 0; i < maxpos-p.pos-1; i++ {
if pointerBufs[pn][i+p.pos+headlen+1] == ' ' {
pointerBufs[pn][i+p.pos+headlen+1] = '─'
}
}
} else {
pointerBufs[pn][p.pos+headlen] = '│'
for _, pos := range p.used {
if pointerBufs[pn][pos+headlen] == ' ' {
pointerBufs[pn][pos+headlen] = '│'
} else {
pointerBufs[pn][pos+headlen] = '┼'
}
}
}
}
}
buf.WriteString(string(pointerBufs[pn]) + "\n")
}
}
}
// get stack bytes
func stack(skip int, indent string) []byte {
var buf = new(bytes.Buffer)
for i := skip; ; i++ {
var pc, file, line, ok = runtime.Caller(i)
if !ok {
break
}
buf.WriteString(indent)
fmt.Fprintf(buf, "at %s() [%s:%d]\n", function(pc), file, line)
}
return buf.Bytes()
}
// return the name of the function containing the PC if possible,
func function(pc uintptr) []byte {
fn := runtime.FuncForPC(pc)
if fn == nil {
return dunno
}
name := []byte(fn.Name())
// The name includes the path name to the package, which is unnecessary
// since the file name is already included. Plus, it has center dots.
// That is, we see
// runtime/debug.*T·ptrmethod
// and want
// *T.ptrmethod
if period := bytes.Index(name, dot); period >= 0 {
name = name[period+1:]
}
name = bytes.Replace(name, centerDot, dot, -1)
return name
}