[インデックス 11695] ファイルの概要
このコミットは、Go言語の標準ライブラリであるstrconvパッケージにおいて、非常に大きな数値入力（特に浮動小数点数）のパース処理を改善し、ParseFloat関数が極端に長い有効な入力に対してパニックを起こす問題を修正するものです。具体的には、数値文字列を内部的に表現するdecimal構造体にtruncフィールドを追加し、桁あふれによって情報が失われた場合にその事実を記録することで、正確な丸め処理を可能にしています。これにより、strconvパッケージがより堅牢になり、広範囲の数値入力に対応できるようになります。
コミット
commit 3ee208533e4da4e2f642c51d3aa753be49c6180b
Author: Russ Cox <rsc@golang.org>
Date: Tue Feb 7 23:37:15 2012 -0500
strconv: handle very large inputs
Fixes #2642.
R=remyoudompheng, r, r
CC=golang-dev
https://golang.org/cl/5639052
---
src/pkg/strconv/atof.go | 10 +++++++---\n src/pkg/strconv/atof_test.go | 15 +++++++++++++++\n src/pkg/strconv/decimal.go | 41 ++++++++++++++++++++++++++++-------------\n 3 files changed, 50 insertions(+), 16 deletions(-)
diff --git a/src/pkg/strconv/atof.go b/src/pkg/strconv/atof.go
index 42fc431db8..cd3031b0e6 100644
--- a/src/pkg/strconv/atof.go
+++ b/src/pkg/strconv/atof.go
@@ -52,10 +52,10 @@ func special(s string) (f float64, ok bool) {
return
}
-// TODO(rsc): Better truncation handling.
func (b *decimal) set(s string) (ok bool) {
i := 0
b.neg = false
+ b.trunc = false
// optional sign
if i >= len(s) {
@@ -88,8 +88,12 @@ func (b *decimal) set(s string) (ok bool) {
b.dp--
continue
}
-\t\tb.d[b.nd] = s[i]
-\t\tb.nd++
+\t\t\tif b.nd < len(b.d) {
+\t\t\t\tb.d[b.nd] = s[i]
+\t\t\t\tb.nd++
+\t\t\t} else if s[i] != '0' {
+\t\t\t\tb.trunc = true
+\t\t\t}\n \t\t\tcontinue
\t\t}
\t\tbreak
diff --git a/src/pkg/strconv/atof_test.go b/src/pkg/strconv/atof_test.go
index 3fa637d2bc..72cea49256 100644
--- a/src/pkg/strconv/atof_test.go
+++ b/src/pkg/strconv/atof_test.go
@@ -9,6 +9,7 @@ import (
"math/rand"
"reflect"
. "strconv"
+ "strings"
"testing"
"time"
)
@@ -117,6 +118,20 @@ var atoftests = []atofTest{
// A very large number (initially wrongly parsed by the fast algorithm).
{"4.630813248087435e+307", "4.630813248087435e+307", nil},
+\n+\t// A different kind of very large number.\n+\t{\"22.222222222222222\", \"22.22222222222222\", nil},\n+\t{\"2.\" + strings.Repeat("2", 4000) + "e+1", "22.22222222222222", nil},\n+\n+\t// Exactly halfway between 1 and math.Nextafter(1, 2).\n+\t// Round to even (down).\n+\t{\"1.00000000000000011102230246251565404236316680908203125\", "1", nil},\n+\t// Slightly lower; still round down.\n+\t{\"1.00000000000000011102230246251565404236316680908203124\", "1", nil},\n+\t// Slightly higher; round up.\n+\t{\"1.00000000000000011102230246251565404236316680908203126\", "1.0000000000000002", nil},\n+\t// Slightly higher, but you have to read all the way to the end.\n+\t{\"1.00000000000000011102230246251565404236316680908203125" + strings.Repeat("0", 10000) + "1", "1.0000000000000002", nil},\n }\n \n type atofSimpleTest struct {\ndiff --git a/src/pkg/strconv/decimal.go b/src/pkg/strconv/decimal.go
index cc5591a8d8..a75071dcc4 100644
--- a/src/pkg/strconv/decimal.go
+++ b/src/pkg/strconv/decimal.go
@@ -12,12 +12,11 @@
package strconv
type decimal struct {
-\t// TODO(rsc): Can make d[] a bit smaller and add
-\t// truncated bool;
-\td [800]byte // digits
-\tnd int // number of digits used
-\tdp int // decimal point
-\tneg bool
+\td [800]byte // digits
+\tnd int // number of digits used
+\tdp int // decimal point
+\tneg bool
+\ttrunc bool // discarded nonzero digits beyond d[:nd]
}\n \n func (a *decimal) String() string {\n@@ -145,8 +144,12 @@ func rightShift(a *decimal, k uint) {\n \tfor n > 0 {\n \t\tdig := n >> k\n \t\tn -= dig << k\n-\t\ta.d[w] = byte(dig + '0')\n-\t\tw++
+\t\tif w < len(a.d) {\n+\t\t\ta.d[w] = byte(dig + '0')\n+\t\t\tw++\n+\t\t} else if dig > 0 {\n+\t\t\ta.trunc = true\n+\t\t}\n \t\tn = n * 10\n \t}\n \n@@ -242,7 +245,11 @@ func leftShift(a *decimal, k uint) {\n \t\tquo := n / 10\n \t\trem := n - 10*quo\n \t\tw--\n-\t\ta.d[w] = byte(rem + '0')\n+\t\tif w < len(a.d) {\n+\t\t\ta.d[w] = byte(rem + '0')\n+\t\t} else if rem != 0 {\n+\t\t\ta.trunc = true\n+\t\t}\n \t\tn = quo\n \t}\n \n@@ -251,11 +258,18 @@ func leftShift(a *decimal, k uint) {\n \t\tquo := n / 10\n \t\trem := n - 10*quo\n \t\tw--\n-\t\ta.d[w] = byte(rem + '0')\n+\t\tif w < len(a.d) {\n+\t\t\ta.d[w] = byte(rem + '0')\n+\t\t} else if rem != 0 {\n+\t\t\ta.trunc = true\n+\t\t}\n \t\tn = quo\n \t}\n \n \ta.nd += delta\n+\tif a.nd >= len(a.d) {\n+\t\ta.nd = len(a.d)\n+\t}\n \ta.dp += delta\n \ttrim(a)\n }\n@@ -286,6 +300,10 @@ func shouldRoundUp(a *decimal, nd int) bool {\n \t\treturn false\n \t}\n \tif a.d[nd] == '5' && nd+1 == a.nd { // exactly halfway - round to even\n+\t\t// if we truncated, a little higher than what's recorded - always round up\n+\t\tif a.trunc {\n+\t\t\treturn true\n+\t\t}\n \t\treturn nd > 0 && (a.d[nd-1]-'0')%2 != 0\n \t}\n \t// not halfway - digit tells all\n@@ -293,7 +311,6 @@ func shouldRoundUp(a *decimal, nd int) bool {\n }\n \n // Round a to nd digits (or fewer).\n-// Returns receiver for convenience.\n // If nd is zero, it means we're rounding\n // just to the left of the digits, as in\n // 0.09 -> 0.1.\n@@ -309,7 +326,6 @@ func (a *decimal) Round(nd int) {\n }\n \n // Round a down to nd digits (or fewer).\n-// Returns receiver for convenience.\n func (a *decimal) RoundDown(nd int) {\n \tif nd < 0 || nd >= a.nd {\n \t\treturn\n@@ -319,7 +335,6 @@ func (a *decimal) RoundDown(nd int) {\n }\n \n // Round a up to nd digits (or fewer).\n-// Returns receiver for convenience.\n func (a *decimal) RoundUp(nd int) {\n \tif nd < 0 || nd >= a.nd {\n \t\treturn\n```
## GitHub上でのコミットページへのリンク
[https://github.com/golang/go/commit/3ee208533e4da4e2f642c51d3aa753be49c6180b](https://github.com/golang/go/commit/3ee208533e4da4e2f642c51d3aa753be49c6180b)
## 元コミット内容
strconv: handle very large inputs
Fixes #2642.
R=remyoudompheng, r, r CC=golang-dev https://golang.org/cl/5639052
## 変更の背景
このコミットは、Go言語の`strconv`パッケージにおける、非常に長い数値文字列のパースに関するバグを修正するために行われました。具体的には、GitHub Issue #2642「strconv: ParseFloat panics on very long, valid inputs」で報告された問題に対応しています。
従来の`strconv`パッケージの`ParseFloat`関数は、非常に長い数値文字列（例えば、数千桁に及ぶようなもの）を浮動小数点数に変換しようとすると、内部的なバッファの限界を超えてパニック（プログラムの異常終了）を引き起こす可能性がありました。これは、数値の有効桁数を超えた部分の情報を適切に処理できていなかったためです。
浮動小数点数のパースにおいては、IEEE 754標準に従って正確な丸め処理を行うことが非常に重要です。特に、表現可能な桁数を超える入力があった場合、その「切り捨てられた」部分が結果の丸めに影響を与える可能性があります。例えば、`0.500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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