package runtime

import (
	"internal/abi"
	"unsafe"
)

func lwp_mcontext_init(mc *mcontextt, stk unsafe.Pointer, mp *m, gp *g, fn uintptr) {
	// Machine dependent mcontext initialisation for LWP.
	mc.__gregs[_REG_ELR] = uint64(abi.FuncPCABI0(lwp_tramp))
	mc.__gregs[_REG_X31] = uint64(uintptr(stk))
	mc.__gregs[_REG_X0] = uint64(uintptr(unsafe.Pointer(mp)))
	mc.__gregs[_REG_X1] = uint64(uintptr(unsafe.Pointer(mp.g0)))

		// TODO: Is it safe to osyield here? https://go.dev/issue/52672
		osyield()
	}

	if cpuprof.numExtra+1+len(stk) < len(cpuprof.extra) {
		i := cpuprof.numExtra
		cpuprof.extra[i] = uintptr(1 + len(stk))
		copy(cpuprof.extra[i+1:], stk)
		cpuprof.numExtra += 1 + len(stk)
	} else {
		cpuprof.lostExtra++
	}

	prof.signalLock.Store(0)
}

// addExtra adds the "extra" profiling events,

		for _, test := range tests {
			if !containsStack(stks, test.stk) {
				t.Errorf("No matching stack entry for %v, want %+v", test.name, test.stk)
			}
		}
	})

}

func stacks(p *profile.Profile) (res [][]string) {
	for _, s := range p.Sample {
		var stk []string
		for _, l := range s.Location {
			for _, line := range l.Line {
				stk = append(stk, line.Function.Name)
			}
		}
		res = append(res, stk)

	}
}

// augmentName attempts to use stk to augment the name of the goroutine
// with stack information. This stack must be related to the goroutine
// in some way, but it doesn't really matter which stack.
func (gs *gState[R]) augmentName(stk trace.Stack) {
	if gs.named {
		return
	}
	if stk == trace.NoStack {
		return
	}
	name := lastFunc(stk)
	gs.baseName += fmt.Sprintf(" %s", name)
	gs.named = true

func (m *Matcher) stack(w Writer) bool {
	const maxStack = 16
	var stk [maxStack]uintptr
	n := runtime.Callers(2, stk[:])
	// caller #2 is not for printing; need it to normalize PCs if ASLR.
	if n <= 1 {
		return false
	}

	base := stk[0]
	// normalize PCs
	for i := range stk[:n] {
		stk[i] -= base
	}

	h := Hash(stk[:n])
	if m.ShouldPrint(h) {
		var d *dedup
		for {

	}
	if p.write != nil {
		panic("pprof: Add called on built-in Profile " + p.name)
	}

	stk := make([]uintptr, 32)
	n := runtime.Callers(skip+1, stk[:])
	stk = stk[:n]
	if len(stk) == 0 {
		// The value for skip is too large, and there's no stack trace to record.
		stk = []uintptr{abi.FuncPCABIInternal(lostProfileEvent)}
	}

	p.mu.Lock()
	defer p.mu.Unlock()
	if p.m[value] != nil {

	// The size field ends at the first space.
	nStr, rest, ok := strings.Cut(s, " ")
	if !ok {
		return "", "", s, ErrHeader
	}

	// Parse the first token as a decimal integer.
	n, perr := strconv.ParseInt(nStr, 10, 0) // Intentionally parse as native int
	if perr != nil || n < 5 || n > int64(len(s)) {
		return "", "", s, ErrHeader
	}
	n -= int64(len(nStr) + 1) // convert from index in s to index in rest
	if n <= 0 {

)

//go:noescape
func clone(flags int32, stk, mp, gp, fn unsafe.Pointer) int32

// May run with m.p==nil, so write barriers are not allowed.
//
//go:nowritebarrier
func newosproc(mp *m) {
	stk := unsafe.Pointer(mp.g0.stack.hi)
	/*
	 * note: strace gets confused if we use CLONE_PTRACE here.
	 */
	if false {

	if !isMatchErr && (nogoErr != nil || isScanErr) {
		stk.Push(path)
		defer stk.Pop()
	}

	p.Error = &PackageError{
		ImportStack: stk.Copy(),
		Pos:         pos,
		Err:         err,
	}
	p.Incomplete = true

	if path != stk.Top() {
		p.Error.setPos(importPos)
	}
}

// Resolve returns the resolved version of imports,

func runtime_expandFinalInlineFrame(stk []uintptr) []uintptr {
	// TODO: It would be more efficient to report only physical PCs to pprof and
	// just expand the whole stack.
	if len(stk) == 0 {
		return stk
	}
	pc := stk[len(stk)-1]
	tracepc := pc - 1

	f := findfunc(tracepc)
	if !f.valid() {
		// Not a Go function.
		return stk
	}

	u, uf := newInlineUnwinder(f, tracepc)