// ensure that it's truly safe for p to not escape to the heap by
// maintaining runtime pointer invariants (for example, that globals
// and the heap may not generally point into a stack).
//
//go:nosplit
//go:nocheckptr
func NoEscape(p unsafe.Pointer) unsafe.Pointer {
	x := uintptr(p)
	return unsafe.Pointer(x ^ 0)
}

var alwaysFalse bool
var escapeSink any

type Counter = counter.Counter

// A StackCounter is the in-memory knowledge about a stack counter.
// StackCounters are more expensive to use than regular Counters,
// requiring, at a minimum, a call to runtime.Callers.
type StackCounter = counter.StackCounter

// NewStack returns a new stack counter with the given name and depth.
//
// See "Counter Naming" in the package doc for a description of counter naming

	EvGoBlockRecv       = 23 // goroutine blocks on chan recv [timestamp, stack]
	EvGoBlockSelect     = 24 // goroutine blocks on select [timestamp, stack]
	EvGoBlockSync       = 25 // goroutine blocks on Mutex/RWMutex [timestamp, stack]
	EvGoBlockCond       = 26 // goroutine blocks on Cond [timestamp, stack]
	EvGoBlockNet        = 27 // goroutine blocks on network [timestamp, stack]
	EvGoSysCall         = 28 // syscall enter [timestamp, stack]

	doasanwrite(addr, uintptr(len), sp, pc)
}

// Private interface for the runtime.
const asanenabled = true

// asan{read,write} are nosplit because they may be called between
// fork and exec, when the stack must not grow. See issue #50391.

//go:linkname asanread
//go:nosplit
func asanread(addr unsafe.Pointer, sz uintptr) {
	sp := getcallersp()
	pc := getcallerpc()
	doasanread(addr, sz, sp, pc)
}

type T [2]*int // contain pointer, not SSA-able (so locals are not registerized)

var p1, p2, p3 T

func F() {
	// 3735936685 is 0xdeaddead. On ARM64 R27 is REGTMP.
	// clobber x, y at entry. not clobber z (stack object).
	// amd64:`MOVL\t\$3735936685, command-line-arguments\.x`, `MOVL\t\$3735936685, command-line-arguments\.y`, -`MOVL\t\$3735936685, command-line-arguments\.z`

	"os"
	"runtime"
	"runtime/pprof"
	"strings"
)

var verbflag = flag.Int("v", 0, "Verbose trace output level")
var hflag = flag.Bool("h", false, "Panic on fatal errors (for stack trace)")
var hwflag = flag.Bool("hw", false, "Panic on warnings (for stack trace)")
var indirsflag = flag.String("i", "", "Input dirs to examine (comma separated)")
var pkgpatflag = flag.String("pkg", "", "Restrict output to package(s) matching specified package pattern.")

			pop := ev.index
			stack = append(stack, ev.node)
			if ev.typ&mask != 0 {
				if !f(ev.node, true, stack) {
					i = pop + 1
					stack = stack[:len(stack)-1]
					continue
				}
			}
			if in.events[pop].typ&mask == 0 {
				// Subtrees does not contain types: skip them.
				i = pop
				continue
			}
		} else {
			// pop
			push := ev.index
			if in.events[push].typ&mask != 0 {

// wasm is excluded because the compiler chatter about register abi pragma ends up
// on stdout, and causes the expected output to not match.

package main

import "fmt"

// This test is designed to provoke a stack growth
// in a way that very likely leaves junk in the
// parameter save area if they aren't saved or spilled
// there, as appropriate.

//go:registerparams
//go:noinline
func f(x int, xm1, xm2, p *int) {

		if err != path.ErrBadPattern {
			t.Errorf("Glob(fs, %#q) returned err=%v, want path.ErrBadPattern", pattern, err)
		}
	}
}

func TestCVE202230630(t *testing.T) {
	// Prior to CVE-2022-30630, a stack exhaustion would occur given a large
	// number of separators. There is now a limit of 10,000.
	_, err := Glob(os.DirFS("."), "/*"+strings.Repeat("/", 10001))
	if err != path.ErrBadPattern {

// both escape analysis and inlining.

func bufferNotEscape() string {
	// b itself does not escape, only its buf field will be
	// copied during String() call, but object "handle" itself
	// can be stack-allocated.
	var b bytes.Buffer
	b.WriteString("123")
	b.Write([]byte{'4'}) // ERROR "\[\]byte{...} does not escape$"