简单谈谈Golang中的字符串与字节数组

1、 ） C $ cat main.gopackage mainfunc main() str := helloprintln(byte(str)$ GOOS=linux GOARCH=amd64 go tool compile -S main.go.go.string.hello SRODATA dupok size=50 x0000 68 65 6c 6c 6f hello. 8个bit 类type StringHeader struct Data uintptrLen inttype SliceHeader struct Data uintptrLen intCap int :str1 :=

2、 this is a stringstr2 := this is anotherstring串的开始和结束，我们可以在字符串内部直接使扫描器，它的主要作就是将输的字符流转换成 func (s *scanner) stdString() s.startLit()for r := s.getr()if r = breakif r = s.escape()continueif r = n s.ungetr()s.error(newline in string)breakif r 0 s.errh(s.line, s.col, string not terminated)breaks.nlsemi =

3、 trues.lit = string(s.stopLit()s.kind = StringLits.tok = _Literal来 ；func (s *scanner) rawString() s.startLit()for r := s.getr()if r = breakif r 0 & s0 = s = strings.Replace(s, r, , -1)u, _ := strconv.Unquote(s)return ValU: u 拼接和类型转换，字符串相关功能的主要是通过+ func walkexpr(n *Node, init *Nodes) *Node switch n.O

4、p / .case OADDSTR:n = addstr(n, init)5concatstring2,3,4,55func addstr(n *Node, init *Nodes) *Node c := n.List.Len()buf := nodnil()args := *Nodebuffor _, n2 := range n.List.Slice() args = append(args, conv(n2, types.TypesTSTRING)var fn stringif c = 5 fn = fmt.Sprintf(concatstring%d, c) else fn = conc

5、atstringst := types.NewSlice(types.TypesTSTRING)slice := nod(OCOMPLIT, nil, typenod(t)slice.List.Set(args1:)args = *Nodebuf, slicecat := syslook(fn)r := nod(OCALL, cat, nil)r.List.Set(args)/ .return rconcatstring2,3,4,5func concatstrings(buf *tmpBuf, a string) string idx := 0l := 0count := 0for i, x

6、 := range a n := len(x)if n = 0 continueif l+n l throw(string concatenation too long)l += ncount+idx = iif count = 0 return if count = 1 & (buf != nil | !stringDataOnStack(aidx) return aidxs, b := rawstringtmp(buf, l)for _, x := range a copy(b, x)b = blen(x):return s1但是在正常情况下，原始的多个字符串都会被调组转换成字符串所使的函

7、数，也就是个类似0 1func slicebytetostring(buf *tmpBuf, b byte) (str string) l := len(b)if l = 0 return if l = 1 stringStructOf(&str).str = unsafe.Pointer(&staticbytesb0)stringStructOf(&str).len = 1returnvar p unsafe.Pointerif buf != nil & len(b) = len(buf) p = unsafe.Pointer(buf) else p = mallocgc(uintptr(len(b), nil, false)stringStructOf(&str).str = pstringStructOf(&str).len = len(b)memmove(p,(*(*slice)(unsafe.Pointer(&b).array, uintptr(len(b)returnstringStructOf成 func stringtoslicebyte(buf *tmpBuf, s string) byte var b byteif bu