mirror of
https://github.com/golang/go
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d4451362c0
Change-Id: I666d2c6ea8d0b54a71260809d1a2573b122865b2 Reviewed-on: https://go-review.googlesource.com/37790 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
391 lines
8.2 KiB
Go
391 lines
8.2 KiB
Go
// Copyright 2012 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 runtime_test
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import (
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"runtime"
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"strconv"
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"strings"
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"testing"
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)
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// Strings and slices that don't escape and fit into tmpBuf are stack allocated,
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// which defeats using AllocsPerRun to test other optimizations.
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const sizeNoStack = 100
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func BenchmarkCompareStringEqual(b *testing.B) {
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bytes := []byte("Hello Gophers!")
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s1, s2 := string(bytes), string(bytes)
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for i := 0; i < b.N; i++ {
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if s1 != s2 {
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b.Fatal("s1 != s2")
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}
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}
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}
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func BenchmarkCompareStringIdentical(b *testing.B) {
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s1 := "Hello Gophers!"
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s2 := s1
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for i := 0; i < b.N; i++ {
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if s1 != s2 {
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b.Fatal("s1 != s2")
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}
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}
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}
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func BenchmarkCompareStringSameLength(b *testing.B) {
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s1 := "Hello Gophers!"
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s2 := "Hello, Gophers"
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for i := 0; i < b.N; i++ {
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if s1 == s2 {
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b.Fatal("s1 == s2")
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}
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}
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}
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func BenchmarkCompareStringDifferentLength(b *testing.B) {
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s1 := "Hello Gophers!"
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s2 := "Hello, Gophers!"
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for i := 0; i < b.N; i++ {
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if s1 == s2 {
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b.Fatal("s1 == s2")
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}
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}
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}
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func BenchmarkCompareStringBigUnaligned(b *testing.B) {
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bytes := make([]byte, 0, 1<<20)
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for len(bytes) < 1<<20 {
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bytes = append(bytes, "Hello Gophers!"...)
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}
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s1, s2 := string(bytes), "hello"+string(bytes)
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for i := 0; i < b.N; i++ {
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if s1 != s2[len("hello"):] {
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b.Fatal("s1 != s2")
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}
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}
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b.SetBytes(int64(len(s1)))
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}
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func BenchmarkCompareStringBig(b *testing.B) {
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bytes := make([]byte, 0, 1<<20)
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for len(bytes) < 1<<20 {
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bytes = append(bytes, "Hello Gophers!"...)
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}
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s1, s2 := string(bytes), string(bytes)
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for i := 0; i < b.N; i++ {
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if s1 != s2 {
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b.Fatal("s1 != s2")
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}
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}
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b.SetBytes(int64(len(s1)))
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}
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func BenchmarkConcatStringAndBytes(b *testing.B) {
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s1 := []byte("Gophers!")
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for i := 0; i < b.N; i++ {
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_ = "Hello " + string(s1)
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}
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}
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var escapeString string
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func BenchmarkSliceByteToString(b *testing.B) {
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buf := []byte{'!'}
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for n := 0; n < 8; n++ {
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b.Run(strconv.Itoa(len(buf)), func(b *testing.B) {
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for i := 0; i < b.N; i++ {
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escapeString = string(buf)
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}
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})
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buf = append(buf, buf...)
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}
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}
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var stringdata = []struct{ name, data string }{
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{"ASCII", "01234567890"},
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{"Japanese", "日本語日本語日本語"},
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{"MixedLength", "$Ѐࠀက퀀𐀀\U00040000\U0010FFFF"},
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}
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func BenchmarkRuneIterate(b *testing.B) {
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b.Run("range", func(b *testing.B) {
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for _, sd := range stringdata {
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b.Run(sd.name, func(b *testing.B) {
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for i := 0; i < b.N; i++ {
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for range sd.data {
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}
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}
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})
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}
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})
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b.Run("range1", func(b *testing.B) {
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for _, sd := range stringdata {
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b.Run(sd.name, func(b *testing.B) {
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for i := 0; i < b.N; i++ {
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for _ = range sd.data {
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}
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}
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})
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}
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})
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b.Run("range2", func(b *testing.B) {
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for _, sd := range stringdata {
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b.Run(sd.name, func(b *testing.B) {
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for i := 0; i < b.N; i++ {
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for _, _ = range sd.data {
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}
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}
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})
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}
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})
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}
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func BenchmarkArrayEqual(b *testing.B) {
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a1 := [16]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
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a2 := [16]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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if a1 != a2 {
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b.Fatal("not equal")
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}
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}
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}
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func TestStringW(t *testing.T) {
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strings := []string{
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"hello",
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"a\u5566\u7788b",
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}
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for _, s := range strings {
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var b []uint16
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for _, c := range s {
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b = append(b, uint16(c))
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if c != rune(uint16(c)) {
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t.Errorf("bad test: stringW can't handle >16 bit runes")
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}
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}
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b = append(b, 0)
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r := runtime.GostringW(b)
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if r != s {
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t.Errorf("gostringW(%v) = %s, want %s", b, r, s)
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}
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}
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}
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func TestLargeStringConcat(t *testing.T) {
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output := runTestProg(t, "testprog", "stringconcat")
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want := "panic: " + strings.Repeat("0", 1<<10) + strings.Repeat("1", 1<<10) +
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strings.Repeat("2", 1<<10) + strings.Repeat("3", 1<<10)
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if !strings.HasPrefix(output, want) {
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t.Fatalf("output does not start with %q:\n%s", want, output)
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}
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}
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func TestCompareTempString(t *testing.T) {
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s := strings.Repeat("x", sizeNoStack)
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b := []byte(s)
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n := testing.AllocsPerRun(1000, func() {
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if string(b) != s {
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t.Fatalf("strings are not equal: '%v' and '%v'", string(b), s)
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}
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if string(b) == s {
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} else {
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t.Fatalf("strings are not equal: '%v' and '%v'", string(b), s)
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}
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})
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if n != 0 {
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t.Fatalf("want 0 allocs, got %v", n)
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}
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}
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func TestStringOnStack(t *testing.T) {
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s := ""
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for i := 0; i < 3; i++ {
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s = "a" + s + "b" + s + "c"
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}
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if want := "aaabcbabccbaabcbabccc"; s != want {
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t.Fatalf("want: '%v', got '%v'", want, s)
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}
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}
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func TestIntString(t *testing.T) {
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// Non-escaping result of intstring.
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s := ""
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for i := 0; i < 4; i++ {
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s += string(i+'0') + string(i+'0'+1)
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}
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if want := "01122334"; s != want {
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t.Fatalf("want '%v', got '%v'", want, s)
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}
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// Escaping result of intstring.
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var a [4]string
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for i := 0; i < 4; i++ {
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a[i] = string(i + '0')
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}
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s = a[0] + a[1] + a[2] + a[3]
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if want := "0123"; s != want {
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t.Fatalf("want '%v', got '%v'", want, s)
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}
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}
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func TestIntStringAllocs(t *testing.T) {
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unknown := '0'
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n := testing.AllocsPerRun(1000, func() {
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s1 := string(unknown)
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s2 := string(unknown + 1)
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if s1 == s2 {
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t.Fatalf("bad")
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}
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})
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if n != 0 {
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t.Fatalf("want 0 allocs, got %v", n)
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}
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}
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func TestRangeStringCast(t *testing.T) {
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s := strings.Repeat("x", sizeNoStack)
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n := testing.AllocsPerRun(1000, func() {
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for i, c := range []byte(s) {
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if c != s[i] {
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t.Fatalf("want '%c' at pos %v, got '%c'", s[i], i, c)
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}
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}
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})
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if n != 0 {
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t.Fatalf("want 0 allocs, got %v", n)
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}
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}
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func isZeroed(b []byte) bool {
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for _, x := range b {
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if x != 0 {
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return false
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}
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}
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return true
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}
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func isZeroedR(r []rune) bool {
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for _, x := range r {
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if x != 0 {
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return false
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}
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}
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return true
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}
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func TestString2Slice(t *testing.T) {
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// Make sure we don't return slices that expose
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// an unzeroed section of stack-allocated temp buf
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// between len and cap. See issue 14232.
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s := "foož"
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b := ([]byte)(s)
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if !isZeroed(b[len(b):cap(b)]) {
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t.Errorf("extra bytes not zeroed")
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}
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r := ([]rune)(s)
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if !isZeroedR(r[len(r):cap(r)]) {
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t.Errorf("extra runes not zeroed")
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}
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}
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const intSize = 32 << (^uint(0) >> 63)
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type atoi64Test struct {
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in string
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out int64
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ok bool
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}
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var atoi64tests = []atoi64Test{
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{"", 0, false},
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{"0", 0, true},
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{"-0", 0, true},
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{"1", 1, true},
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{"-1", -1, true},
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{"12345", 12345, true},
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{"-12345", -12345, true},
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{"012345", 12345, true},
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{"-012345", -12345, true},
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{"12345x", 0, false},
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{"-12345x", 0, false},
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{"98765432100", 98765432100, true},
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{"-98765432100", -98765432100, true},
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{"20496382327982653440", 0, false},
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{"-20496382327982653440", 0, false},
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{"9223372036854775807", 1<<63 - 1, true},
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{"-9223372036854775807", -(1<<63 - 1), true},
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{"9223372036854775808", 0, false},
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{"-9223372036854775808", -1 << 63, true},
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{"9223372036854775809", 0, false},
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{"-9223372036854775809", 0, false},
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}
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func TestAtoi(t *testing.T) {
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switch intSize {
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case 32:
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for i := range atoi32tests {
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test := &atoi32tests[i]
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out, ok := runtime.Atoi(test.in)
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if test.out != int32(out) || test.ok != ok {
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t.Errorf("atoi(%q) = (%v, %v) want (%v, %v)",
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test.in, out, ok, test.out, test.ok)
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}
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}
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case 64:
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for i := range atoi64tests {
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test := &atoi64tests[i]
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out, ok := runtime.Atoi(test.in)
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if test.out != int64(out) || test.ok != ok {
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t.Errorf("atoi(%q) = (%v, %v) want (%v, %v)",
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test.in, out, ok, test.out, test.ok)
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}
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}
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}
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}
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type atoi32Test struct {
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in string
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out int32
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ok bool
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}
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var atoi32tests = []atoi32Test{
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{"", 0, false},
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{"0", 0, true},
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{"-0", 0, true},
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{"1", 1, true},
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{"-1", -1, true},
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{"12345", 12345, true},
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{"-12345", -12345, true},
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{"012345", 12345, true},
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{"-012345", -12345, true},
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{"12345x", 0, false},
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{"-12345x", 0, false},
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{"987654321", 987654321, true},
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{"-987654321", -987654321, true},
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{"2147483647", 1<<31 - 1, true},
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{"-2147483647", -(1<<31 - 1), true},
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{"2147483648", 0, false},
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{"-2147483648", -1 << 31, true},
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{"2147483649", 0, false},
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{"-2147483649", 0, false},
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}
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func TestAtoi32(t *testing.T) {
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for i := range atoi32tests {
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test := &atoi32tests[i]
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out, ok := runtime.Atoi32(test.in)
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if test.out != out || test.ok != ok {
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t.Errorf("atoi32(%q) = (%v, %v) want (%v, %v)",
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test.in, out, ok, test.out, test.ok)
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}
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}
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}
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