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jeremybenn |
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package strconv_test
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import (
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"runtime"
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. "strconv"
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"testing"
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)
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type itob64Test struct {
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in int64
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base int
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out string
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}
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var itob64tests = []itob64Test{
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{0, 10, "0"},
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{1, 10, "1"},
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{-1, 10, "-1"},
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{12345678, 10, "12345678"},
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{-987654321, 10, "-987654321"},
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{1<<31 - 1, 10, "2147483647"},
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{-1<<31 + 1, 10, "-2147483647"},
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{1 << 31, 10, "2147483648"},
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{-1 << 31, 10, "-2147483648"},
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{1<<31 + 1, 10, "2147483649"},
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{-1<<31 - 1, 10, "-2147483649"},
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{1<<32 - 1, 10, "4294967295"},
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{-1<<32 + 1, 10, "-4294967295"},
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{1 << 32, 10, "4294967296"},
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{-1 << 32, 10, "-4294967296"},
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{1<<32 + 1, 10, "4294967297"},
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{-1<<32 - 1, 10, "-4294967297"},
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{1 << 50, 10, "1125899906842624"},
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{1<<63 - 1, 10, "9223372036854775807"},
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{-1<<63 + 1, 10, "-9223372036854775807"},
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{-1 << 63, 10, "-9223372036854775808"},
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{0, 2, "0"},
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{10, 2, "1010"},
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{-1, 2, "-1"},
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{1 << 15, 2, "1000000000000000"},
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{-8, 8, "-10"},
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{057635436545, 8, "57635436545"},
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{1 << 24, 8, "100000000"},
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{16, 16, "10"},
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{-0x123456789abcdef, 16, "-123456789abcdef"},
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{1<<63 - 1, 16, "7fffffffffffffff"},
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{1<<63 - 1, 2, "111111111111111111111111111111111111111111111111111111111111111"},
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{16, 17, "g"},
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{25, 25, "10"},
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{(((((17*35+24)*35+21)*35+34)*35+12)*35+24)*35 + 32, 35, "holycow"},
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{(((((17*36+24)*36+21)*36+34)*36+12)*36+24)*36 + 32, 36, "holycow"},
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}
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func TestItoa(t *testing.T) {
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for _, test := range itob64tests {
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s := FormatInt(test.in, test.base)
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if s != test.out {
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t.Errorf("FormatInt(%v, %v) = %v want %v",
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test.in, test.base, s, test.out)
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}
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x := AppendInt([]byte("abc"), test.in, test.base)
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if string(x) != "abc"+test.out {
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t.Errorf("AppendInt(%q, %v, %v) = %q want %v",
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"abc", test.in, test.base, x, test.out)
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}
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if test.in >= 0 {
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s := FormatUint(uint64(test.in), test.base)
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if s != test.out {
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t.Errorf("FormatUint(%v, %v) = %v want %v",
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test.in, test.base, s, test.out)
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}
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x := AppendUint(nil, uint64(test.in), test.base)
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if string(x) != test.out {
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t.Errorf("AppendUint(%q, %v, %v) = %q want %v",
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"abc", uint64(test.in), test.base, x, test.out)
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}
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}
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if test.base == 10 && int64(int(test.in)) == test.in {
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s := Itoa(int(test.in))
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if s != test.out {
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t.Errorf("Itoa(%v) = %v want %v",
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test.in, s, test.out)
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}
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}
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}
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}
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type uitob64Test struct {
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in uint64
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base int
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out string
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}
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var uitob64tests = []uitob64Test{
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{1<<63 - 1, 10, "9223372036854775807"},
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{1 << 63, 10, "9223372036854775808"},
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{1<<63 + 1, 10, "9223372036854775809"},
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{1<<64 - 2, 10, "18446744073709551614"},
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{1<<64 - 1, 10, "18446744073709551615"},
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{1<<64 - 1, 2, "1111111111111111111111111111111111111111111111111111111111111111"},
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}
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func TestUitoa(t *testing.T) {
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for _, test := range uitob64tests {
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s := FormatUint(test.in, test.base)
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if s != test.out {
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t.Errorf("FormatUint(%v, %v) = %v want %v",
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test.in, test.base, s, test.out)
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}
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x := AppendUint([]byte("abc"), test.in, test.base)
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if string(x) != "abc"+test.out {
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t.Errorf("AppendUint(%q, %v, %v) = %q want %v",
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"abc", test.in, test.base, x, test.out)
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}
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}
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}
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func numAllocations(f func()) int {
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memstats := new(runtime.MemStats)
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runtime.ReadMemStats(memstats)
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n0 := memstats.Mallocs
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f()
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runtime.ReadMemStats(memstats)
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return int(memstats.Mallocs - n0)
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}
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/* This test relies on escape analysis which gccgo does not yet do.
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var globalBuf [64]byte
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func TestAppendUintDoesntAllocate(t *testing.T) {
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n := numAllocations(func() {
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var buf [64]byte
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AppendInt(buf[:0], 123, 10)
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})
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want := 1 // TODO(bradfitz): this might be 0, once escape analysis is better
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if n != want {
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t.Errorf("with local buffer, did %d allocations, want %d", n, want)
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}
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n = numAllocations(func() {
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AppendInt(globalBuf[:0], 123, 10)
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})
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if n != 0 {
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t.Errorf("with reused buffer, did %d allocations, want 0", n)
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}
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}
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*/
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func BenchmarkFormatInt(b *testing.B) {
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for i := 0; i < b.N; i++ {
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for _, test := range itob64tests {
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FormatInt(test.in, test.base)
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}
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}
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}
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func BenchmarkAppendInt(b *testing.B) {
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dst := make([]byte, 0, 30)
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for i := 0; i < b.N; i++ {
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for _, test := range itob64tests {
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AppendInt(dst, test.in, test.base)
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}
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}
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}
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func BenchmarkFormatUint(b *testing.B) {
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for i := 0; i < b.N; i++ {
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for _, test := range uitob64tests {
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FormatUint(test.in, test.base)
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}
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}
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}
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func BenchmarkAppendUint(b *testing.B) {
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dst := make([]byte, 0, 30)
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for i := 0; i < b.N; i++ {
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for _, test := range uitob64tests {
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AppendUint(dst, test.in, test.base)
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}
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}
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}
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