| // Copyright 2012 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package runtime_test |
| |
| import ( |
| "runtime" |
| "strconv" |
| "strings" |
| "testing" |
| "unicode/utf8" |
| ) |
| |
| // Strings and slices that don't escape and fit into tmpBuf are stack allocated, |
| // which defeats using AllocsPerRun to test other optimizations. |
| const sizeNoStack = 100 |
| |
| func BenchmarkCompareStringEqual(b *testing.B) { |
| bytes := []byte("Hello Gophers!") |
| s1, s2 := string(bytes), string(bytes) |
| for i := 0; i < b.N; i++ { |
| if s1 != s2 { |
| b.Fatal("s1 != s2") |
| } |
| } |
| } |
| |
| func BenchmarkCompareStringIdentical(b *testing.B) { |
| s1 := "Hello Gophers!" |
| s2 := s1 |
| for i := 0; i < b.N; i++ { |
| if s1 != s2 { |
| b.Fatal("s1 != s2") |
| } |
| } |
| } |
| |
| func BenchmarkCompareStringSameLength(b *testing.B) { |
| s1 := "Hello Gophers!" |
| s2 := "Hello, Gophers" |
| for i := 0; i < b.N; i++ { |
| if s1 == s2 { |
| b.Fatal("s1 == s2") |
| } |
| } |
| } |
| |
| func BenchmarkCompareStringDifferentLength(b *testing.B) { |
| s1 := "Hello Gophers!" |
| s2 := "Hello, Gophers!" |
| for i := 0; i < b.N; i++ { |
| if s1 == s2 { |
| b.Fatal("s1 == s2") |
| } |
| } |
| } |
| |
| func BenchmarkCompareStringBigUnaligned(b *testing.B) { |
| bytes := make([]byte, 0, 1<<20) |
| for len(bytes) < 1<<20 { |
| bytes = append(bytes, "Hello Gophers!"...) |
| } |
| s1, s2 := string(bytes), "hello"+string(bytes) |
| for i := 0; i < b.N; i++ { |
| if s1 != s2[len("hello"):] { |
| b.Fatal("s1 != s2") |
| } |
| } |
| b.SetBytes(int64(len(s1))) |
| } |
| |
| func BenchmarkCompareStringBig(b *testing.B) { |
| bytes := make([]byte, 0, 1<<20) |
| for len(bytes) < 1<<20 { |
| bytes = append(bytes, "Hello Gophers!"...) |
| } |
| s1, s2 := string(bytes), string(bytes) |
| for i := 0; i < b.N; i++ { |
| if s1 != s2 { |
| b.Fatal("s1 != s2") |
| } |
| } |
| b.SetBytes(int64(len(s1))) |
| } |
| |
| func BenchmarkConcatStringAndBytes(b *testing.B) { |
| s1 := []byte("Gophers!") |
| for i := 0; i < b.N; i++ { |
| _ = "Hello " + string(s1) |
| } |
| } |
| |
| var escapeString string |
| |
| func BenchmarkSliceByteToString(b *testing.B) { |
| buf := []byte{'!'} |
| for n := 0; n < 8; n++ { |
| b.Run(strconv.Itoa(len(buf)), func(b *testing.B) { |
| for i := 0; i < b.N; i++ { |
| escapeString = string(buf) |
| } |
| }) |
| buf = append(buf, buf...) |
| } |
| } |
| |
| var stringdata = []struct{ name, data string }{ |
| {"ASCII", "01234567890"}, |
| {"Japanese", "日本語日本語日本語"}, |
| {"MixedLength", "$Ѐࠀက퀀𐀀\U00040000\U0010FFFF"}, |
| } |
| |
| var sinkInt int |
| |
| func BenchmarkRuneCount(b *testing.B) { |
| // Each sub-benchmark counts the runes in a string in a different way. |
| b.Run("lenruneslice", func(b *testing.B) { |
| for _, sd := range stringdata { |
| b.Run(sd.name, func(b *testing.B) { |
| for i := 0; i < b.N; i++ { |
| sinkInt += len([]rune(sd.data)) |
| } |
| }) |
| } |
| }) |
| b.Run("rangeloop", func(b *testing.B) { |
| for _, sd := range stringdata { |
| b.Run(sd.name, func(b *testing.B) { |
| for i := 0; i < b.N; i++ { |
| n := 0 |
| for range sd.data { |
| n++ |
| } |
| sinkInt += n |
| } |
| }) |
| } |
| }) |
| b.Run("utf8.RuneCountInString", func(b *testing.B) { |
| for _, sd := range stringdata { |
| b.Run(sd.name, func(b *testing.B) { |
| for i := 0; i < b.N; i++ { |
| sinkInt += utf8.RuneCountInString(sd.data) |
| } |
| }) |
| } |
| }) |
| } |
| |
| func BenchmarkRuneIterate(b *testing.B) { |
| b.Run("range", func(b *testing.B) { |
| for _, sd := range stringdata { |
| b.Run(sd.name, func(b *testing.B) { |
| for i := 0; i < b.N; i++ { |
| for range sd.data { |
| } |
| } |
| }) |
| } |
| }) |
| b.Run("range1", func(b *testing.B) { |
| for _, sd := range stringdata { |
| b.Run(sd.name, func(b *testing.B) { |
| for i := 0; i < b.N; i++ { |
| for range sd.data { |
| } |
| } |
| }) |
| } |
| }) |
| b.Run("range2", func(b *testing.B) { |
| for _, sd := range stringdata { |
| b.Run(sd.name, func(b *testing.B) { |
| for i := 0; i < b.N; i++ { |
| for range sd.data { |
| } |
| } |
| }) |
| } |
| }) |
| } |
| |
| func BenchmarkArrayEqual(b *testing.B) { |
| a1 := [16]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16} |
| a2 := [16]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16} |
| b.ResetTimer() |
| for i := 0; i < b.N; i++ { |
| if a1 != a2 { |
| b.Fatal("not equal") |
| } |
| } |
| } |
| |
| /* |
| func TestStringW(t *testing.T) { |
| strings := []string{ |
| "hello", |
| "a\u5566\u7788b", |
| } |
| |
| for _, s := range strings { |
| var b []uint16 |
| for _, c := range s { |
| b = append(b, uint16(c)) |
| if c != rune(uint16(c)) { |
| t.Errorf("bad test: stringW can't handle >16 bit runes") |
| } |
| } |
| b = append(b, 0) |
| r := runtime.GostringW(b) |
| if r != s { |
| t.Errorf("gostringW(%v) = %s, want %s", b, r, s) |
| } |
| } |
| } |
| */ |
| |
| func TestLargeStringConcat(t *testing.T) { |
| output := runTestProg(t, "testprog", "stringconcat") |
| want := "panic: " + strings.Repeat("0", 1<<10) + strings.Repeat("1", 1<<10) + |
| strings.Repeat("2", 1<<10) + strings.Repeat("3", 1<<10) |
| if !strings.HasPrefix(output, want) { |
| t.Fatalf("output does not start with %q:\n%s", want, output) |
| } |
| } |
| |
| func TestCompareTempString(t *testing.T) { |
| s := strings.Repeat("x", sizeNoStack) |
| b := []byte(s) |
| n := testing.AllocsPerRun(1000, func() { |
| if string(b) != s { |
| t.Fatalf("strings are not equal: '%v' and '%v'", string(b), s) |
| } |
| if string(b) == s { |
| } else { |
| t.Fatalf("strings are not equal: '%v' and '%v'", string(b), s) |
| } |
| }) |
| // was n != 0, changed for gccgo. |
| if n > 2 { |
| t.Fatalf("want 0 allocs, got %v", n) |
| } |
| } |
| |
| func TestStringIndexHaystack(t *testing.T) { |
| // See issue 25864. |
| haystack := []byte("hello") |
| needle := "ll" |
| n := testing.AllocsPerRun(1000, func() { |
| if strings.Index(string(haystack), needle) != 2 { |
| t.Fatalf("needle not found") |
| } |
| }) |
| // was n != 0, changed for gccgo. |
| if n > 1 { |
| t.Fatalf("want 0 allocs, got %v", n) |
| } |
| } |
| |
| func TestStringIndexNeedle(t *testing.T) { |
| // See issue 25864. |
| haystack := "hello" |
| needle := []byte("ll") |
| n := testing.AllocsPerRun(1000, func() { |
| if strings.Index(haystack, string(needle)) != 2 { |
| t.Fatalf("needle not found") |
| } |
| }) |
| // was n != 0, changed for gccgo |
| if n > 1 { |
| t.Fatalf("want 0 allocs, got %v", n) |
| } |
| } |
| |
| func TestStringOnStack(t *testing.T) { |
| s := "" |
| for i := 0; i < 3; i++ { |
| s = "a" + s + "b" + s + "c" |
| } |
| |
| if want := "aaabcbabccbaabcbabccc"; s != want { |
| t.Fatalf("want: '%v', got '%v'", want, s) |
| } |
| } |
| |
| func TestIntString(t *testing.T) { |
| // Non-escaping result of intstring. |
| s := "" |
| for i := rune(0); i < 4; i++ { |
| s += string(i+'0') + string(i+'0'+1) |
| } |
| if want := "01122334"; s != want { |
| t.Fatalf("want '%v', got '%v'", want, s) |
| } |
| |
| // Escaping result of intstring. |
| var a [4]string |
| for i := rune(0); i < 4; i++ { |
| a[i] = string(i + '0') |
| } |
| s = a[0] + a[1] + a[2] + a[3] |
| if want := "0123"; s != want { |
| t.Fatalf("want '%v', got '%v'", want, s) |
| } |
| } |
| |
| func TestIntStringAllocs(t *testing.T) { |
| unknown := '0' |
| n := testing.AllocsPerRun(1000, func() { |
| s1 := string(unknown) |
| s2 := string(unknown + 1) |
| if s1 == s2 { |
| t.Fatalf("bad") |
| } |
| }) |
| // was n != 0, changed for gccgo, which currently does one |
| // allocation for each call to string(unknown). |
| if n > 2 { |
| t.Fatalf("want 0 allocs, got %v", n) |
| } |
| } |
| |
| func TestRangeStringCast(t *testing.T) { |
| s := strings.Repeat("x", sizeNoStack) |
| n := testing.AllocsPerRun(1000, func() { |
| for i, c := range []byte(s) { |
| if c != s[i] { |
| t.Fatalf("want '%c' at pos %v, got '%c'", s[i], i, c) |
| } |
| } |
| }) |
| // was n != 0, changed for gccgo. |
| if n > 1 { |
| t.Fatalf("want 0 allocs, got %v", n) |
| } |
| } |
| |
| func isZeroed(b []byte) bool { |
| for _, x := range b { |
| if x != 0 { |
| return false |
| } |
| } |
| return true |
| } |
| |
| func isZeroedR(r []rune) bool { |
| for _, x := range r { |
| if x != 0 { |
| return false |
| } |
| } |
| return true |
| } |
| |
| func TestString2Slice(t *testing.T) { |
| // Make sure we don't return slices that expose |
| // an unzeroed section of stack-allocated temp buf |
| // between len and cap. See issue 14232. |
| s := "foož" |
| b := ([]byte)(s) |
| if !isZeroed(b[len(b):cap(b)]) { |
| t.Errorf("extra bytes not zeroed") |
| } |
| r := ([]rune)(s) |
| if !isZeroedR(r[len(r):cap(r)]) { |
| t.Errorf("extra runes not zeroed") |
| } |
| } |
| |
| const intSize = 32 << (^uint(0) >> 63) |
| |
| type atoi64Test struct { |
| in string |
| out int64 |
| ok bool |
| } |
| |
| var atoi64tests = []atoi64Test{ |
| {"", 0, false}, |
| {"0", 0, true}, |
| {"-0", 0, true}, |
| {"1", 1, true}, |
| {"-1", -1, true}, |
| {"12345", 12345, true}, |
| {"-12345", -12345, true}, |
| {"012345", 12345, true}, |
| {"-012345", -12345, true}, |
| {"12345x", 0, false}, |
| {"-12345x", 0, false}, |
| {"98765432100", 98765432100, true}, |
| {"-98765432100", -98765432100, true}, |
| {"20496382327982653440", 0, false}, |
| {"-20496382327982653440", 0, false}, |
| {"9223372036854775807", 1<<63 - 1, true}, |
| {"-9223372036854775807", -(1<<63 - 1), true}, |
| {"9223372036854775808", 0, false}, |
| {"-9223372036854775808", -1 << 63, true}, |
| {"9223372036854775809", 0, false}, |
| {"-9223372036854775809", 0, false}, |
| } |
| |
| func TestAtoi(t *testing.T) { |
| switch intSize { |
| case 32: |
| for i := range atoi32tests { |
| test := &atoi32tests[i] |
| out, ok := runtime.Atoi(test.in) |
| if test.out != int32(out) || test.ok != ok { |
| t.Errorf("atoi(%q) = (%v, %v) want (%v, %v)", |
| test.in, out, ok, test.out, test.ok) |
| } |
| } |
| case 64: |
| for i := range atoi64tests { |
| test := &atoi64tests[i] |
| out, ok := runtime.Atoi(test.in) |
| if test.out != int64(out) || test.ok != ok { |
| t.Errorf("atoi(%q) = (%v, %v) want (%v, %v)", |
| test.in, out, ok, test.out, test.ok) |
| } |
| } |
| } |
| } |
| |
| type atoi32Test struct { |
| in string |
| out int32 |
| ok bool |
| } |
| |
| var atoi32tests = []atoi32Test{ |
| {"", 0, false}, |
| {"0", 0, true}, |
| {"-0", 0, true}, |
| {"1", 1, true}, |
| {"-1", -1, true}, |
| {"12345", 12345, true}, |
| {"-12345", -12345, true}, |
| {"012345", 12345, true}, |
| {"-012345", -12345, true}, |
| {"12345x", 0, false}, |
| {"-12345x", 0, false}, |
| {"987654321", 987654321, true}, |
| {"-987654321", -987654321, true}, |
| {"2147483647", 1<<31 - 1, true}, |
| {"-2147483647", -(1<<31 - 1), true}, |
| {"2147483648", 0, false}, |
| {"-2147483648", -1 << 31, true}, |
| {"2147483649", 0, false}, |
| {"-2147483649", 0, false}, |
| } |
| |
| func TestAtoi32(t *testing.T) { |
| for i := range atoi32tests { |
| test := &atoi32tests[i] |
| out, ok := runtime.Atoi32(test.in) |
| if test.out != out || test.ok != ok { |
| t.Errorf("atoi32(%q) = (%v, %v) want (%v, %v)", |
| test.in, out, ok, test.out, test.ok) |
| } |
| } |
| } |
