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

//go:build arm || wasm

// Export some functions via linkname to assembly in sync/atomic.
//
//go:linkname And32
//go:linkname Or32
//go:linkname And64
//go:linkname Or64
//go:linkname Anduintptr
//go:linkname Oruintptr

package atomic

import _ "unsafe" // For linkname

//go:nosplit
func And32(ptr *uint32, val uint32) uint32 {
	for {
		old := *ptr

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

package runtime

import "unsafe"

var labelSync uintptr

// runtime_setProfLabel should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
//   - github.com/cloudwego/localsession
//   - github.com/DataDog/datadog-agent
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//

//
//go:nosplit
func rand32() uint32 {
	return uint32(rand())
}

// rand returns a random uint64 from the per-m chacha8 state.
// Do not change signature: used via linkname from other packages.
//
//go:nosplit
//go:linkname rand
func rand() uint64 {
	// Note: We avoid acquirem here so that in the fast path
	// there is just a getg, an inlined c.Next, and a return.

	_cgo_getstackbound            unsafe.Pointer
)

// iscgo is set to true by the runtime/cgo package
//
// iscgo should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
//   - github.com/ebitengine/purego
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname iscgo
var iscgo bool

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

package x509

import (
	"internal/godebug"
	"sync"
	_ "unsafe" // for linkname
)

// systemRoots should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
//   - github.com/breml/rootcerts
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.

// Copyright 2024 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.

// Linkname "var" to reference newcoro is not allowed.

package main

import "unsafe"

func main() {
	call(&newcoro)
}

//go:linkname newcoro runtime.newcoro
var newcoro unsafe.Pointer

//go:noinline
func call(*unsafe.Pointer) {
	// not implemented

// Copyright 2024 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.

// Test that a linkname applied on an assembly declaration
// does not affect stack map generation.

package main

import (
	"runtime"
	_ "unsafe"
)

//go:linkname asm
func asm(*int)

func main() {
	x := new(int)
	asm(x)
}

// called from asm

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

//go:build arm64 && linux

package cpu

import _ "unsafe" // for linkname

// HWCap may be initialized by archauxv and
// should not be changed after it was initialized.
//
// Other widely used packages
// access HWCap using linkname as well, most notably:
//   - github.com/klauspost/cpuid/v2
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.

}

func lowerASCII(c byte) byte {
	if 'A' <= c && c <= 'Z' {
		return c + ('a' - 'A')
	}
	return c
}

// _cgo_setenv should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
//   - github.com/ebitengine/purego
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname _cgo_setenv

// Copyright 2024 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.

// Linkname coroswitch is not allowed, even if iter.Pull
// is instantiated in the same package.

package main

import (
	"iter"
	"unsafe"
)

func seq(yield func(int) bool) {
	yield(123)
}

func main() {
	next, stop := iter.Pull(seq)
	next()
	stop()