blob: 589fea87eb33f3c4540a2f1d9ce2db3b4c6c4fd4 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
// +build !appengine,!appenginevm
package jsonparser
import (
"reflect"
"strconv"
"unsafe"
"runtime"
)
//
// The reason for using *[]byte rather than []byte in parameters is an optimization. As of Go 1.6,
// the compiler cannot perfectly inline the function when using a non-pointer slice. That is,
// the non-pointer []byte parameter version is slower than if its function body is manually
// inlined, whereas the pointer []byte version is equally fast to the manually inlined
// version. Instruction count in assembly taken from "go tool compile" confirms this difference.
//
// TODO: Remove hack after Go 1.7 release
//
func equalStr(b *[]byte, s string) bool {
return *(*string)(unsafe.Pointer(b)) == s
}
func parseFloat(b *[]byte) (float64, error) {
return strconv.ParseFloat(*(*string)(unsafe.Pointer(b)), 64)
}
// A hack until issue golang/go#2632 is fixed.
// See: https://github.com/golang/go/issues/2632
func bytesToString(b *[]byte) string {
return *(*string)(unsafe.Pointer(b))
}
func StringToBytes(s string) []byte {
b := make([]byte, 0, 0)
bh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
sh := (*reflect.StringHeader)(unsafe.Pointer(&s))
bh.Data = sh.Data
bh.Cap = sh.Len
bh.Len = sh.Len
runtime.KeepAlive(s)
return b
}
|
