parentTID  uint64 // Where to store child TID, in parent's memory (pid_t *)
	exitSignal uint64 // Signal to deliver to parent on child termination
	stack      uint64 // Pointer to lowest byte of stack
	stackSize  uint64 // Size of stack
	tls        uint64 // Location of new TLS
	setTID     uint64 // Pointer to a pid_t array (since Linux 5.5)
	setTIDSize uint64 // Number of elements in set_tid (since Linux 5.5)

	for _, l := range locs {
		stack, err := obj.SourceLine(l.Address)
		if err != nil || len(stack) == 0 {
			// No answers from addr2line.
			continue
		}

		l.Line = make([]profile.Line, len(stack))
		l.IsFolded = false
		for i, frame := range stack {
			if frame.Func != "" {
				m.HasFunctions = true
			}
			if frame.File != "" {

	-mutexprofile mutex.out
	    Write a mutex contention profile to the specified file
	    when all tests are complete.
	    Writes test binary as -c would.

	-mutexprofilefraction n
	    Sample 1 in n stack traces of goroutines holding a
	    contended mutex.

	-outputdir directory
	    Place output files from profiling in the specified directory,
	    by default the directory in which "go test" is running.

// as a span.
//
// Must be in a non-preemptible state to ensure the consistency of statistics
// exported to MemStats.
//
// Acquires the heap lock. Must run on the system stack for that reason.
//
//go:systemstack
func (h *mheap) allocUserArenaChunk() *mspan {
	var s *mspan
	var base uintptr

	// First check the free list.
	lock(&h.lock)

		p := s.Prog(storeOp)
		p.From.Type = obj.TYPE_REG
		p.From.Reg = v.Args[0].Reg()
		ssagen.AddrAuto(&p.To, v)

	case ssa.OpArgIntReg, ssa.OpArgFloatReg:
		// The assembler needs to wrap the entry safepoint/stack growth code with spill/unspill
		// The loop only runs once.
		for _, a := range v.Block.Func.RegArgs {
			// Pass the spill/unspill information along to the assembler, offset by size of
			// the saved LR slot.

// 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

	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]

	// (They may be actively dialing, but this conn is ready first.
	// Chrome calls this socket late binding.
	// See https://www.chromium.org/developers/design-documents/network-stack#TOC-Connection-Management.)
	key := pconn.cacheKey
	if q, ok := t.idleConnWait[key]; ok {
		done := false
		if pconn.alt == nil {
			// HTTP/1.

			ctx.Slice(traceviewer.SliceEvent{
				Name:     r.Name,
				Ts:       ctx.elapsed(ar.time),
				Dur:      ev.Time().Sub(ar.time),
				Resource: trace.GCP,
				Stack:    ctx.Stack(viewerFrames(ar.stack)),
				EndStack: ctx.Stack(viewerFrames(ev.Stack())),
			})
		}
		delete(g.ranges, r.Name)
	}
}

// Finish flushes any outstanding ranges at the end of the trace.

			// anyone allocate one on the Go side. As a side effect of this annotation,
			// pointers to this type will not be considered pointers in Go. They won't
			// get writebarrier-ed or adjusted during a stack copy. This should handle
			// all the cases badPointerTypedef used to handle, but hopefully will
			// continue to work going forward without any more need for cgo changes.
			tt.Go = c.Ident(incomplete)