func opset(a, b0 obj.As) {
	oprange[a&obj.AMask] = oprange[b0]
}

// Determine if the build configuration requires a TOC pointer.
// It is assumed this always called after buildop.
func NeedTOCpointer(ctxt *obj.Link) bool {
	return !pfxEnabled && ctxt.Flag_shared
}

// Build the opcode table
func buildop(ctxt *obj.Link) {
	// Limit PC-relative prefix instruction usage to supported and tested targets.

package riscv

import (
	"cmd/internal/obj"
	"cmd/internal/objabi"
	"cmd/internal/sys"
	"fmt"
	"internal/abi"
	"internal/buildcfg"
	"log"
	"math/bits"
	"strings"
)

func buildop(ctxt *obj.Link) {}

func jalToSym(ctxt *obj.Link, p *obj.Prog, lr int16) {
	switch p.As {
	case obj.ACALL, obj.AJMP, obj.ARET, obj.ADUFFZERO, obj.ADUFFCOPY:
	default:
		ctxt.Diag("unexpected Prog in jalToSym: %v", p)

	p = cursym.Func().Text
	if p == nil || p.Link == nil { // handle external functions and ELF section symbols
		return
	}

	if oprange[AAND&obj.AMask] == nil {
		ctxt.Diag("arm ops not initialized, call arm.buildop first")
	}

	c := ctxt5{ctxt: ctxt, newprog: newprog, cursym: cursym, autosize: p.To.Offset + 4}
	pc := int32(0)

	op = p
	p = p.Link
	var m int
	var o *Optab

const buildIDSeparator = "/"

// actionID returns the action ID half of a build ID.
func actionID(buildID string) string {
	i := strings.Index(buildID, buildIDSeparator)
	if i < 0 {
		return buildID
	}
	return buildID[:i]
}

// contentID returns the content ID half of a build ID.
func contentID(buildID string) string {
	return buildID[strings.LastIndex(buildID, buildIDSeparator)+1:]
}

	p := cursym.Func().Text
	if p == nil || p.Link == nil { // handle external functions and ELF section symbols
		return
	}

	if oprange[AORW&obj.AMask] == nil {
		ctxt.Diag("s390x ops not initialized, call s390x.buildop first")
	}

	c := ctxtz{ctxt: ctxt, newprog: newprog, cursym: cursym, autosize: int32(p.To.Offset)}

	buffer := make([]byte, 0)
	changed := true
	loop := 0
	nrelocs0 := len(c.cursym.R)
	for changed {

		case 2:
			if !bytes.HasPrefix(line, goobject) {
				return tryGccgo()
			}
		case 3:
			if !bytes.HasPrefix(line, buildid) {
				// Found the object header, just doesn't have a build id line.
				// Treat as successful, with empty build id.
				return "", nil
			}
			id, err := strconv.Unquote(string(line[len(buildid):]))
			if err != nil {
				return tryGccgo()
			}
			return id, nil
		}
	}
}

	if p == nil || p.Link == nil { // handle external functions and ELF section symbols
		return
	}

	if oprange[AAND&obj.AMask] == nil {
		ctxt.Diag("arm64 ops not initialized, call arm64.buildop first")
	}

	c := ctxt7{ctxt: ctxt, newprog: newprog, cursym: cursym, autosize: int32(p.To.Offset & 0xffffffff), extrasize: int32(p.To.Offset >> 32)}
	p.To.Offset &= 0xffffffff // extrasize is no longer needed

package strings

import (
	"internal/abi"
	"internal/bytealg"
	"unicode/utf8"
	"unsafe"
)

// A Builder is used to efficiently build a string using [Builder.Write] methods.
// It minimizes memory copying. The zero value is ready to use.
// Do not copy a non-zero Builder.
type Builder struct {
	addr *Builder // of receiver, to detect copies by value

	// External users should never get direct access to this buffer, since

func NewBuilder(buffer []byte) *Builder {
	return &Builder{
		result: buffer,
	}
}

// NewFixedBuilder creates a Builder that appends its output into the given
// buffer. This builder does not reallocate the output buffer. Writes that
// would exceed the buffer's capacity are treated as an error.
func NewFixedBuilder(buffer []byte) *Builder {
	return &Builder{
		result:    buffer,
		fixedSize: true,
	}
}

package headers

import (
	"net/http"
)

// Builder for HTTP headers.
type Builder struct {
	headers http.Header
}

// New Builder for HTTP headers.
func New() *Builder {
	return &Builder{
		headers: make(http.Header),
	}
}

// Get returns the current value for the key.
func (b *Builder) Get(key string) string {
	return b.headers.Get(key)
}