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https://github.com/nspcc-dev/neo-go.git
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270f0d2d7a
We're popping an item (array) off the stack, OK, it triggers refs.Remove() for
it. Then we're pushing an inner item to the stack, OK, it triggers refs.Add()
for this element. Why are we removing it afterwards? Looks like something went
wrong in 324107b31e (and https://github.com/nspcc-dev/neo-go/pull/1670)
since a simple test shows zero counter after POPITEM and -1 after popping the
only item left on the stack.
Signed-off-by: Roman Khimov <roman@nspcc.ru>
82 lines
1.7 KiB
Go
82 lines
1.7 KiB
Go
package vm
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import (
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"testing"
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"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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"github.com/stretchr/testify/require"
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)
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func TestRefCounter_Add(t *testing.T) {
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r := newRefCounter()
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require.Equal(t, 0, int(*r))
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r.Add(stackitem.Null{})
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require.Equal(t, 1, int(*r))
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r.Add(stackitem.Null{})
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require.Equal(t, 2, int(*r)) // count scalar items twice
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arr := stackitem.NewArray([]stackitem.Item{stackitem.NewByteArray([]byte{1}), stackitem.NewBool(false)})
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r.Add(arr)
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require.Equal(t, 5, int(*r)) // array + 2 elements
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r.Add(arr)
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require.Equal(t, 6, int(*r)) // count only array
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r.Remove(arr)
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require.Equal(t, 5, int(*r))
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r.Remove(arr)
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require.Equal(t, 2, int(*r))
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m := stackitem.NewMap()
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m.Add(stackitem.NewByteArray([]byte("some")), stackitem.NewBool(false))
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r.Add(m)
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require.Equal(t, 5, int(*r)) // map + key + value
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r.Add(m)
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require.Equal(t, 6, int(*r)) // map only
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r.Remove(m)
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require.Equal(t, 5, int(*r))
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r.Remove(m)
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require.Equal(t, 2, int(*r))
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}
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func TestRefCounterPopItem(t *testing.T) {
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prog := makeProgram(opcode.POPITEM)
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v := load(prog)
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v.estack.PushVal(stackitem.NewArray([]stackitem.Item{stackitem.Make(42)}))
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require.Equal(t, 2, int(v.refs))
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runVM(t, v)
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require.Equal(t, 1, v.estack.Len())
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require.Equal(t, 1, int(v.refs))
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_ = v.estack.Pop()
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require.Equal(t, 0, v.estack.Len())
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require.Equal(t, 0, int(v.refs))
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}
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func BenchmarkRefCounter_Add(b *testing.B) {
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a := stackitem.NewArray(nil)
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rc := newRefCounter()
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b.ResetTimer()
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for range b.N {
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rc.Add(a)
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}
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}
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func BenchmarkRefCounter_AddRemove(b *testing.B) {
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a := stackitem.NewArray([]stackitem.Item{})
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rc := newRefCounter()
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b.ResetTimer()
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for range b.N {
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rc.Add(a)
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rc.Remove(a)
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}
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}
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