// is the first number not yet assigned or reserved. N should
// be larger than zero. For each entry and exit number, the
// values one larger and smaller are reserved to indicate
// "strictly above" and "strictly below". numberBlock returns
// the smallest number not yet assigned or reserved (i.e., the
// exit number of the last block visited, plus two, because
// last.exit+1 is a reserved value.)
//
// examples:
//

// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package objabi

import (
	"fmt"
	"strings"

	"internal/buildcfg"
)

const (
	ElfRelocOffset   = 256
	MachoRelocOffset = 2048    // reserve enough space for ELF relocations
	GlobalDictPrefix = ".dict" // prefix for names of global dictionaries
)

	if gotplt.Size() != 0 {
		ctxt.Errorf(gotplt.Sym(), "got.plt is not empty")
	}

	// Reserve got[0] for resolver address (populated by dynamic loader).
	gotplt.AddUint32(ctxt.Arch, 0)
	gotplt.AddUint32(ctxt.Arch, 0)
	gotLocalCount++

	// Reserve got[1] for ELF object pointer (populated by dynamic loader).
	gotplt.AddUint32(ctxt.Arch, 0)
	gotplt.AddUint32(ctxt.Arch, 0)
	gotLocalCount++

	// ourselves to circumvent the stack checks in the
	// Windows exception dispatcher.
	// Commit size must be strictly less than reserve
	// size otherwise reserve will be rounded up to a
	// larger size, as verified with VMMap.

	// On 64-bit, we always reserve 2MB stacks. "Pure" Go code is
	// okay with much smaller stacks, but the syscall package
	// makes it easy to call into arbitrary C code without cgo,

		return `""`
	}
	n := len(s)
	hasSpace := false
	for i := 0; i < len(s); i++ {
		switch s[i] {
		case '"', '\\':
			n++
		case ' ', '\t':
			hasSpace = true
		}
	}
	if hasSpace {
		n += 2 // Reserve space for quotes.
	}
	if n == len(s) {
		return s
	}

	qs := make([]byte, n)
	j := 0
	if hasSpace {
		qs[j] = '"'
		j++
	}
	slashes := 0
	for i := 0; i < len(s); i++ {
		switch s[i] {

		}
	}

	return env, nil
}

var extraEnvKeys = []string{
	"SYSTEMROOT",         // must be preserved on Windows to find DLLs; golang.org/issue/25210
	"WINDIR",             // must be preserved on Windows to be able to run PowerShell command; golang.org/issue/30711
	"LD_LIBRARY_PATH",    // must be preserved on Unix systems to find shared libraries
	"LIBRARY_PATH",       // allow override of non-standard static library paths

	// stubs and reserve a PLT slot.
	//
	// 1) The call site is a "bl x" where genpltstub rewrites it to
	//    "bl x_stub". Depending on the properties of the caller
	//    (see ELFv2 1.5 4.2.5.3), a nop may be expected immediately
	//    after the bl. This nop is rewritten to ld r2,24(r1) to
	//    restore the toc pointer saved by x_stub.
	//
	// 2) We reserve space for a pointer in the .plt section (once

	p.From.Class = 0
	p.To.Class = 0

	// Previously we rewrote $0 to ZR, but we have now removed this change.
	// In order to be compatible with some previous legal instruction formats,
	// reserve the previous conversion for some specific instructions.
	if p.From.Type == obj.TYPE_CONST && p.From.Offset == 0 && zrReplace[p.As] {
		p.From.Type = obj.TYPE_REG
		p.From.Reg = REGZERO
	}

				out.Write32(t.off)
				out.Write32(t.align)
				out.Write32(t.reloc)
				out.Write32(t.nreloc)
				out.Write32(t.flag)
				out.Write32(t.res1) /* reserved */
				out.Write32(t.res2) /* reserved */
				out.Write32(0)      /* reserved */
			} else {
				out.WriteStringN(t.name, 16)
				out.WriteStringN(t.segname, 16)
				out.Write32(uint32(t.addr))
				out.Write32(uint32(t.size))
				out.Write32(t.off)

	Osntdata    int16    // Section Number For Tdata Section
	Osntbss     int16    // Section Number For Tbss Section
	Ox64flags   uint16   // Additional Flags For 64-Bit Objects
	Oresv3a     int16    // Reserved
	Oresv3      [2]int32 // Reserved
}

// Section Header
type XcoffScnHdr64 struct {
	Sname    [8]byte // Section Name
	Spaddr   uint64  // Physical Address
	Svaddr   uint64  // Virtual Address