// - Maps and channels contains no-in-heap types are disallowed.
//
// 4. Write barriers on pointers to not-in-heap types can be omitted.
//
// The last point is the real benefit of NotInHeap. The runtime uses
// it for low-level internal structures to avoid memory barriers in the
// scheduler and the memory allocator where they are illegal or simply

// the heap goal is defined in terms of bytes of objects, rather than pages like
// RSS. As a result, we need to take into account for fragmentation internal to
// spans. heapGoal / lastHeapGoal defines the ratio between the current heap goal
// and the last heap goal, which tells us by how much the heap is growing and
// shrinking. We estimate what the heap will grow to in terms of pages by taking

}

func (c *Expiring) gc(now time.Time) {
	for {
		// Return from gc if the heap is empty or the next element is not yet
		// expired.
		//
		// heap[0] is a peek at the next element in the heap, which is not obvious
		// from looking at the (*expiringHeap).Pop() implementation below.
		// heap.Pop() swaps the first entry with the last entry of the heap, then
		// calls (*expiringHeap).Pop() which returns the last element.

	return foo(foo(bar(a, b)))
}

func tbff1() *string {
	a := "cat"
	b := "dog" // ERROR "moved to heap: b$"
	u := bff(&a, &b)
	_ = u[0]
	return &b
}

// BAD: need fine-grained analysis to track u[0] and u[1] differently.
func tbff2() *string {
	a := "cat" // ERROR "moved to heap: a$"
	b := "dog" // ERROR "moved to heap: b$"
	u := bff(&a, &b)
	_ = u[0]
	return u[1]
}

		p = alloc(3) // ERROR "inlining call to alloc" "moved to heap: x"
	}
	f()
}

func f2() {} // ERROR "can inline f2"

// No inline for recover; panic now allowed to inline.
func f3() { panic(1) } // ERROR "can inline f3" "1 escapes to heap"
func f4() { recover() }

func f5() *byte { // ERROR "can inline f5"
	type T struct {
		x [1]byte
	}
	t := new(T) // ERROR "new.T. escapes to heap"

	if err != nil {
		return err
	}

	// copy heap to new mapping
	if uint64(oldlen+len(out.heap)) > filesize {
		panic("mmap size too small")
	}
	copy(out.buf[oldlen:], out.heap)
	out.heap = out.heap[:0]
	return nil
}

func (out *OutBuf) munmap() {
	if out.buf == nil {
		return
	}
	syscall.Munmap(out.buf)
	out.buf = nil

			}
		}
	}()

	return q
}

func (q *Queue) Len() int {
	q.mutex.Lock()
	defer q.mutex.Unlock()
	return q.heap.Len()
}

func (q *Queue) Schedule(handler func(), deadline time.Time) {
	// Add the timer to the heap.
	q.mutex.Lock()
	heap.Push(&q.heap, &entry{
		handler:  handler,
		deadline: deadline,
		index:    0,
	})
	q.mutex.Unlock()

	// Request that the timer be reset.

		// The heap variables aren't protected by a mutex. For now, just bomb if you
		// try to use OutBuf in parallel. (Note this probably could be fixed.)
		if out.isView {
			panic("cannot write to heap in parallel")
		}
		// See if our heap would grow to be too large, and if so, copy it to the end
		// of the mmapped area.
		if heapLen > maxOutBufHeapLen && out.copyHeap() {
			heapPos -= heapLen

func f1() {
	var t T
	f := t.noescape // ERROR "t.noescape does not escape"
	f()
}

func f2() {
	var t T       // ERROR "moved to heap"
	f := t.escape // ERROR "t.escape does not escape"
	f()
}

func f3() {
	var t T        // ERROR "moved to heap"
	f := t.returns // ERROR "t.returns does not escape"
	sink = f()
}

type T struct{}

package ld

// Mmap allocates an in-heap output buffer with the given size. It copies
// any old data (if any) to the new buffer.
func (out *OutBuf) Mmap(filesize uint64) error {
	// We need space to put all the symbols before we apply relocations.
	oldheap := out.heap
	if filesize < uint64(len(oldheap)) {
		panic("mmap size too small")
	}
	out.heap = make([]byte, filesize)
	copy(out.heap, oldheap)
	return nil
}