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// Copyright 2015 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
"math"
"time"
. "github.com/pingcap/check"
"github.com/pingcap/tidb/util/testleak"
)
var _ = Suite(&testOverflowSuite{})
type testOverflowSuite struct {
}
func (s *testOverflowSuite) TestAdd(c *C) {
defer testleak.AfterTest(c)()
tblUint64 := []struct {
lsh uint64
rsh uint64
ret uint64
overflow bool
}{
{math.MaxUint64, 1, 0, true},
{math.MaxUint64, 0, math.MaxUint64, false},
{1, 1, 2, false},
}
for _, t := range tblUint64 {
ret, err := AddUint64(t.lsh, t.rsh)
if t.overflow {
c.Assert(err, NotNil)
} else {
c.Assert(ret, Equals, t.ret)
}
}
tblInt64 := []struct {
lsh int64
rsh int64
ret int64
overflow bool
}{
{math.MaxInt64, 1, 0, true},
{math.MaxInt64, 0, math.MaxInt64, false},
{0, math.MinInt64, math.MinInt64, false},
{-1, math.MinInt64, 0, true},
{math.MaxInt64, math.MinInt64, -1, false},
{1, 1, 2, false},
{1, -1, 0, false},
}
for _, t := range tblInt64 {
ret, err := AddInt64(t.lsh, t.rsh)
if t.overflow {
c.Assert(err, NotNil)
} else {
c.Assert(ret, Equals, t.ret)
}
ret2, err := AddDuration(time.Duration(t.lsh), time.Duration(t.rsh))
if t.overflow {
c.Assert(err, NotNil)
} else {
c.Assert(ret2, Equals, time.Duration(t.ret))
}
}
tblInt := []struct {
lsh uint64
rsh int64
ret uint64
overflow bool
}{
{math.MaxUint64, math.MinInt64, math.MaxUint64 + math.MinInt64, false},
{math.MaxInt64, math.MinInt64, 0, true},
{0, -1, 0, true},
{1, -1, 0, false},
{0, 1, 1, false},
{1, 1, 2, false},
}
for _, t := range tblInt {
ret, err := AddInteger(t.lsh, t.rsh)
if t.overflow {
c.Assert(err, NotNil)
} else {
c.Assert(ret, Equals, t.ret)
}
}
}
func (s *testOverflowSuite) TestSub(c *C) {
defer testleak.AfterTest(c)()
tblUint64 := []struct {
lsh uint64
rsh uint64
ret uint64
overflow bool
}{
{math.MaxUint64, 1, math.MaxUint64 - 1, false},
{math.MaxUint64, 0, math.MaxUint64, false},
{0, math.MaxUint64, 0, true},
{0, 1, 0, true},
{1, math.MaxUint64, 0, true},
{1, 1, 0, false},
}
for _, t := range tblUint64 {
ret, err := SubUint64(t.lsh, t.rsh)
if t.overflow {
c.Assert(err, NotNil)
} else {
c.Assert(ret, Equals, t.ret)
}
}
tblInt64 := []struct {
lsh int64
rsh int64
ret int64
overflow bool
}{
{math.MinInt64, 0, math.MinInt64, false},
{math.MinInt64, 1, 0, true},
{math.MaxInt64, -1, 0, true},
{0, math.MinInt64, 0, true},
{-1, math.MinInt64, math.MaxInt64, false},
{math.MinInt64, math.MaxInt64, 0, true},
{math.MinInt64, math.MinInt64, 0, false},
{math.MinInt64, -math.MaxInt64, -1, false},
{1, 1, 0, false},
}
for _, t := range tblInt64 {
ret, err := SubInt64(t.lsh, t.rsh)
if t.overflow {
c.Assert(err, NotNil)
} else {
c.Assert(ret, Equals, t.ret)
}
}
tblInt := []struct {
lsh uint64
rsh int64
ret uint64
overflow bool
}{
{0, math.MinInt64, -math.MinInt64, false},
{0, 1, 0, true},
{math.MaxUint64, math.MinInt64, 0, true},
{math.MaxInt64, math.MinInt64, 2*math.MaxInt64 + 1, false},
{math.MaxUint64, -1, 0, true},
{0, -1, 1, false},
{1, 1, 0, false},
}
for _, t := range tblInt {
ret, err := SubUintWithInt(t.lsh, t.rsh)
if t.overflow {
c.Assert(err, NotNil)
} else {
c.Assert(ret, Equals, t.ret)
}
}
tblInt2 := []struct {
lsh int64
rsh uint64
ret uint64
overflow bool
}{
{math.MinInt64, 0, 0, true},
{math.MaxInt64, 0, math.MaxInt64, false},
{math.MaxInt64, math.MaxUint64, 0, true},
{math.MaxInt64, -math.MinInt64, 0, true},
{-1, 0, 0, true},
{1, 1, 0, false},
}
for _, t := range tblInt2 {
ret, err := SubIntWithUint(t.lsh, t.rsh)
if t.overflow {
c.Assert(err, NotNil)
} else {
c.Assert(ret, Equals, t.ret)
}
}
}
func (s *testOverflowSuite) TestMul(c *C) {
defer testleak.AfterTest(c)()
tblUint64 := []struct {
lsh uint64
rsh uint64
ret uint64
overflow bool
}{
{math.MaxUint64, 1, math.MaxUint64, false},
{math.MaxUint64, 0, 0, false},
{math.MaxUint64, 2, 0, true},
{1, 1, 1, false},
}
for _, t := range tblUint64 {
ret, err := MulUint64(t.lsh, t.rsh)
if t.overflow {
c.Assert(err, NotNil)
} else {
c.Assert(ret, Equals, t.ret)
}
}
tblInt64 := []struct {
lsh int64
rsh int64
ret int64
overflow bool
}{
{math.MaxInt64, 1, math.MaxInt64, false},
{math.MinInt64, 1, math.MinInt64, false},
{math.MaxInt64, -1, -math.MaxInt64, false},
{math.MinInt64, -1, 0, true},
{math.MinInt64, 0, 0, false},
{math.MaxInt64, 0, 0, false},
{math.MaxInt64, math.MaxInt64, 0, true},
{math.MaxInt64, math.MinInt64, 0, true},
{math.MinInt64 / 10, 11, 0, true},
{1, 1, 1, false},
}
for _, t := range tblInt64 {
ret, err := MulInt64(t.lsh, t.rsh)
if t.overflow {
c.Assert(err, NotNil)
} else {
c.Assert(ret, Equals, t.ret)
}
}
tblInt := []struct {
lsh uint64
rsh int64
ret uint64
overflow bool
}{
{math.MaxUint64, 0, 0, false},
{0, -1, 0, false},
{1, -1, 0, true},
{math.MaxUint64, -1, 0, true},
{math.MaxUint64, 10, 0, true},
{1, 1, 1, false},
}
for _, t := range tblInt {
ret, err := MulInteger(t.lsh, t.rsh)
if t.overflow {
c.Assert(err, NotNil)
} else {
c.Assert(ret, Equals, t.ret)
}
}
}
func (s *testOverflowSuite) TestDiv(c *C) {
defer testleak.AfterTest(c)()
tblInt64 := []struct {
lsh int64
rsh int64
ret int64
overflow bool
}{
{math.MaxInt64, 1, math.MaxInt64, false},
{math.MinInt64, 1, math.MinInt64, false},
{math.MinInt64, -1, 0, true},
{math.MaxInt64, -1, -math.MaxInt64, false},
{1, -1, -1, false},
{-1, 1, -1, false},
{-1, 2, 0, false},
{math.MinInt64, 2, math.MinInt64 / 2, false},
}
for _, t := range tblInt64 {
ret, err := DivInt64(t.lsh, t.rsh)
if t.overflow {
c.Assert(err, NotNil)
} else {
c.Assert(ret, Equals, t.ret)
}
}
tblInt := []struct {
lsh uint64
rsh int64
ret uint64
overflow bool
}{
{0, -1, 0, false},
{1, -1, 0, true},
{math.MaxInt64, math.MinInt64, 0, false},
{math.MaxInt64, -1, 0, true},
{100, 20, 5, false},
}
for _, t := range tblInt {
ret, err := DivUintWithInt(t.lsh, t.rsh)
if t.overflow {
c.Assert(err, NotNil)
} else {
c.Assert(ret, Equals, t.ret)
}
}
tblInt2 := []struct {
lsh int64
rsh uint64
ret uint64
overflow bool
}{
{math.MinInt64, math.MaxInt64, 0, true},
{0, 1, 0, false},
{-1, math.MaxInt64, 0, false},
}
for _, t := range tblInt2 {
ret, err := DivIntWithUint(t.lsh, t.rsh)
if t.overflow {
c.Assert(err, NotNil)
} else {
c.Assert(ret, Equals, t.ret)
}
}
}