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