bumps uptrace/bun dependencies to v1.2.6 (#3569)

vendor/github.com/buger/jsonparser/bytes_unsafe.go

@@ -0,0 +1,44 @@
+// +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
+}