and the matching call to <code>l.RUnlock</code> is synchronized before the return from call <i>n</i>+1 to <code>l.Lock</code>.
</p>

<p class="rule">
A successful call to <code>l.TryLock</code> (or <code>l.TryRLock</code>)
is equivalent to a call to <code>l.Lock</code> (or <code>l.RLock</code>).
An unsuccessful call has no synchronizing effect at all.
As far as the memory model is concerned,

	JMP	label0+0	// JMP 66
	BEQ	R1, 2(PC)
	JAL	1(PC)	// CALL 1(PC)
	BEQ	R1, 2(PC)
	JAL	label0+0	// CALL 66

	//	LBRA addr
	//	{
	//		outcode(int($1), &nullgen, 0, &$2);
	//	}
	BEQ	R1, 2(PC)
	JMP	0(R1)	// JMP (R1)
	BEQ	R1, 2(PC)
	JMP	foo+0(SB)	// JMP foo(SB)
	BEQ	R1, 2(PC)
	JAL	0(R1)	// CALL (R1)
	BEQ	R1, 2(PC)
	JAL	foo+0(SB)	// CALL foo(SB)

//
// BEQ/BNE
//
//	LBRA rreg ',' rel

pkg debug/elf, const R_AARCH64_P32_TLSDESC_ADR_PREL21 = 123
pkg debug/elf, const R_AARCH64_P32_TLSDESC_ADR_PREL21 R_AARCH64
pkg debug/elf, const R_AARCH64_P32_TLSDESC_CALL = 127
pkg debug/elf, const R_AARCH64_P32_TLSDESC_CALL R_AARCH64
pkg debug/elf, const R_AARCH64_P32_TLSDESC_LD32_LO12_NC = 125
pkg debug/elf, const R_AARCH64_P32_TLSDESC_LD32_LO12_NC R_AARCH64
pkg debug/elf, const R_AARCH64_P32_TLSDESC_LD_PREL19 = 122

// Peek returns the next n bytes without advancing the reader. The bytes stop
// being valid at the next read call. If Peek returns fewer than n bytes, it
// also returns an error explaining why the read is short. The error is
// [ErrBufferFull] if n is larger than b's buffer size.
//
// Calling Peek prevents a [Reader.UnreadByte] or [Reader.UnreadRune] call from succeeding
// until the next read operation.
func (b *Reader) Peek(n int) ([]byte, error) {

pkg debug/elf, const R_ARM_THM_TLS_CALL = 93
pkg debug/elf, const R_ARM_THM_TLS_CALL R_ARM
pkg debug/elf, const R_ARM_THM_TLS_DESCSEQ16 = 129
pkg debug/elf, const R_ARM_THM_TLS_DESCSEQ16 R_ARM
pkg debug/elf, const R_ARM_THM_TLS_DESCSEQ32 = 130
pkg debug/elf, const R_ARM_THM_TLS_DESCSEQ32 R_ARM
pkg debug/elf, const R_ARM_TLS_CALL = 91
pkg debug/elf, const R_ARM_TLS_CALL R_ARM
pkg debug/elf, const R_ARM_TLS_DESCSEQ = 92

import (
	"cmd/internal/obj"
	"cmd/internal/obj/mips"
)

func jumpMIPS(word string) bool {
	switch word {
	case "BEQ", "BFPF", "BFPT", "BGEZ", "BGEZAL", "BGTZ", "BLEZ", "BLTZ", "BLTZAL", "BNE", "JMP", "JAL", "CALL":
		return true
	}
	return false
}

// IsMIPSCMP reports whether the op (as defined by an mips.A* constant) is
// one of the CMP instructions that require special handling.
func IsMIPSCMP(op obj.As) bool {

// allowed. To create a directory instead of a file, add a trailing
// slash to the name.
// The file's contents must be written to the [io.Writer] before the next
// call to [Writer.Create], [Writer.CreateHeader], or [Writer.Close].
func (w *Writer) Create(name string) (io.Writer, error) {
	header := &FileHeader{
		Name:   name,
		Method: Deflate,
	}
	return w.CreateHeader(header)

	"BCC":   true,
	"BLO":   true,
	"BMI":   true,
	"BPL":   true,
	"BVS":   true,
	"BVC":   true,
	"BHI":   true,
	"BLS":   true,
	"BGE":   true,
	"BLT":   true,
	"BGT":   true,
	"BLE":   true,
	"CALL":  true,
	"CBZ":   true,
	"CBZW":  true,
	"CBNZ":  true,
	"CBNZW": true,
	"JMP":   true,
	"TBNZ":  true,
	"TBZ":   true,

	// ADR isn't really a jump, but it takes a PC or label reference,

		}
	}
	if s.Err() != nil {
		t.Fatal("after scan:", s.Err())
	}
}

// negativeEOFReader returns an invalid -1 at the end, as though it
// were wrapping the read system call.
type negativeEOFReader int

func (r *negativeEOFReader) Read(p []byte) (int, error) {
	if *r > 0 {
		c := int(*r)
		if c > len(p) {
			c = len(p)
		}
		for i := 0; i < c; i++ {
			p[i] = 'a'

// license that can be found in the LICENSE file.

// This wrapper uses syscall.Flock to prevent concurrent adb commands,
// so for now it only builds on platforms that support that system call.
// TODO(#33974): use a more portable library for file locking.

//go:build darwin || dragonfly || freebsd || illumos || linux || netbsd || openbsd

// This program can be used as go_android_GOARCH_exec by the Go tool.