}

	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 {
		panic("pprof: Profile.Add of duplicate value")
	}
	p.m[value] = stk
}

		name := n.Fun.(*ir.Name).Sym().Name
		arg := n.Args[0]
		var wantABI obj.ABI
		switch name {
		case "FuncPCABI0":
			wantABI = obj.ABI0
		case "FuncPCABIInternal":
			wantABI = obj.ABIInternal
		}
		if n.Type() != types.Types[types.TUINTPTR] {
			base.FatalfAt(n.Pos(), "FuncPC intrinsic should return uintptr, got %v", n.Type()) // as expected by typecheck.FuncPC.
		}

func gostartcallfn(gobuf *gobuf, fv *funcval) {
	var fn unsafe.Pointer
	if fv != nil {
		fn = unsafe.Pointer(fv.fn)
	} else {
		fn = unsafe.Pointer(abi.FuncPCABIInternal(nilfunc))
	}
	gostartcall(gobuf, fn, unsafe.Pointer(fv))
}

// isShrinkStackSafe returns whether it's safe to attempt to shrink
// gp's stack. Shrinking the stack is only safe when we have precise

		// so there is no chance of getg().m being reassigned
		// out from under us while this function executes.
		tsLocal := &getg().m.p.ptr().timers
		if tsLocal.raceCtx == 0 {
			tsLocal.raceCtx = racegostart(abi.FuncPCABIInternal((*timers).run) + sys.PCQuantum)
		}
		raceacquirectx(tsLocal.raceCtx, unsafe.Pointer(t))
	}

	if t.state&(timerModified|timerZombie) != 0 {
		badTimer()
	}

	f := t.f
	arg := t.arg