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// 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 TestConcatTempString(t *testing.T) { s := "bytes" b := []byte(s) n := testing.AllocsPerRun(1000, func() { if "prefix "+string(b)+" suffix" != "prefix bytes suffix" { t.Fatalf("strings are not equal: '%v' and '%v'", "prefix "+string(b)+" suffix", "prefix bytes suffix") } }) if n != 0 { t.Fatalf("want 0 allocs, got %v", n) } } 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 { t.Fatalf("strings are not equal: '%v' and '%v'", string(b), s) } 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) } if string(b) <= s { } else { 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) } }) if n != 0 { 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") } }) if n != 0 { 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") } }) if n != 0 { 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") } }) if n != 0 { 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) } } }) if n != 0 { 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) } } } func TestParseByteCount(t *testing.T) { for _, test := range []struct { in string out int64 ok bool }{ // Good numeric inputs. {"1", 1, true}, {"12345", 12345, true}, {"012345", 12345, true}, {"98765432100", 98765432100, true}, {"9223372036854775807", 1<<63 - 1, true}, // Good trivial suffix inputs. {"1B", 1, true}, {"12345B", 12345, true}, {"012345B", 12345, true}, {"98765432100B", 98765432100, true}, {"9223372036854775807B", 1<<63 - 1, true}, // Good binary suffix inputs. {"1KiB", 1 << 10, true}, {"05KiB", 5 << 10, true}, {"1MiB", 1 << 20, true}, {"10MiB", 10 << 20, true}, {"1GiB", 1 << 30, true}, {"100GiB", 100 << 30, true}, {"1TiB", 1 << 40, true}, {"99TiB", 99 << 40, true}, // Good zero inputs. // // -0 is an edge case, but no harm in supporting it. {"-0", 0, true}, {"0", 0, true}, {"0B", 0, true}, {"0KiB", 0, true}, {"0MiB", 0, true}, {"0GiB", 0, true}, {"0TiB", 0, true}, // Bad inputs. {"", 0, false}, {"-1", 0, false}, {"a12345", 0, false}, {"a12345B", 0, false}, {"12345x", 0, false}, {"0x12345", 0, false}, // Bad numeric inputs. {"9223372036854775808", 0, false}, {"9223372036854775809", 0, false}, {"18446744073709551615", 0, false}, {"20496382327982653440", 0, false}, {"18446744073709551616", 0, false}, {"18446744073709551617", 0, false}, {"9999999999999999999999", 0, false}, // Bad trivial suffix inputs. {"9223372036854775808B", 0, false}, {"9223372036854775809B", 0, false}, {"18446744073709551615B", 0, false}, {"20496382327982653440B", 0, false}, {"18446744073709551616B", 0, false}, {"18446744073709551617B", 0, false}, {"9999999999999999999999B", 0, false}, // Bad binary suffix inputs. {"1Ki", 0, false}, {"05Ki", 0, false}, {"10Mi", 0, false}, {"100Gi", 0, false}, {"99Ti", 0, false}, {"22iB", 0, false}, {"B", 0, false}, {"iB", 0, false}, {"KiB", 0, false}, {"MiB", 0, false}, {"GiB", 0, false}, {"TiB", 0, false}, {"-120KiB", 0, false}, {"-891MiB", 0, false}, {"-704GiB", 0, false}, {"-42TiB", 0, false}, {"99999999999999999999KiB", 0, false}, {"99999999999999999MiB", 0, false}, {"99999999999999GiB", 0, false}, {"99999999999TiB", 0, false}, {"555EiB", 0, false}, // Mistaken SI suffix inputs. {"0KB", 0, false}, {"0MB", 0, false}, {"0GB", 0, false}, {"0TB", 0, false}, {"1KB", 0, false}, {"05KB", 0, false}, {"1MB", 0, false}, {"10MB", 0, false}, {"1GB", 0, false}, {"100GB", 0, false}, {"1TB", 0, false}, {"99TB", 0, false}, {"1K", 0, false}, {"05K", 0, false}, {"10M", 0, false}, {"100G", 0, false}, {"99T", 0, false}, {"99999999999999999999KB", 0, false}, {"99999999999999999MB", 0, false}, {"99999999999999GB", 0, false}, {"99999999999TB", 0, false}, {"99999999999TiB", 0, false}, {"555EB", 0, false}, } { out, ok := runtime.ParseByteCount(test.in) if test.out != out || test.ok != ok { t.Errorf("parseByteCount(%q) = (%v, %v) want (%v, %v)", test.in, out, ok, test.out, test.ok) } } }