ceremonyclient/pebble/internal/arenaskl/arena_test.go

54 lines
1.8 KiB
Go
Raw Normal View History

2024-01-03 07:31:42 +00:00
/*
* Copyright 2017 Dgraph Labs, Inc. and Contributors
* Modifications copyright (C) 2017 Andy Kimball and Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package arenaskl
import (
"math"
"testing"
"github.com/cockroachdb/pebble/internal/constants"
"github.com/stretchr/testify/require"
)
func newArena(n uint32) *Arena {
return NewArena(make([]byte, n))
}
// TestArenaSizeOverflow tests that large allocations do not cause Arena's
// internal size accounting to overflow and produce incorrect results.
func TestArenaSizeOverflow(t *testing.T) {
a := newArena(constants.MaxUint32OrInt)
// Allocating under the limit throws no error.
offset, _, err := a.alloc(math.MaxUint16, 1, 0)
require.Nil(t, err)
require.Equal(t, uint32(1), offset)
require.Equal(t, uint32(math.MaxUint16)+1, a.Size())
// Allocating over the limit could cause an accounting
// overflow if 32-bit arithmetic was used. It shouldn't.
_, _, err = a.alloc(math.MaxUint32, 1, 0)
require.Equal(t, ErrArenaFull, err)
require.Equal(t, uint32(constants.MaxUint32OrInt), a.Size())
// Continuing to allocate continues to throw an error.
_, _, err = a.alloc(math.MaxUint16, 1, 0)
require.Equal(t, ErrArenaFull, err)
require.Equal(t, uint32(constants.MaxUint32OrInt), a.Size())
}