问题描述

我将是第一个承认我对低级编程的整体知识有点稀疏的人.我了解许多核心概念，但我不经常使用它们.话虽如此，我对 dtoa.c 需要多少代码感到非常震惊.

I'll be the first to admit that my overall knowledge of low level programming is a bit sparse. I understand many of the core concepts but I do not use them on a regular basis. That being said I was absolutely astounded at how much code was needed for dtoa.c.

在过去的几个月里，我一直致力于 C# 中的 ECMAScript 实现，我一直在减慢填补引擎中的漏洞.昨晚我开始研究 15.7.4.2 部分中描述的 Number.prototype.toString#x15.7.4.2" rel="noreferrer">ECMAScript 规范 (pdf).在 9.8.1 部分，NOTE 3 提供了一个到 dtoa.c 的链接，但我正在寻找一个挑战，所以我等待查看它.以下是我想出的.

For the past couple months I have been working on an ECMAScript implementation in C# and I've been slowing filling in the holes in my engine. Last night I started working on Number.prototype.toString which is described in section 15.7.4.2 of the ECMAScript specification (pdf). In section 9.8.1, NOTE 3 offers a link to dtoa.c but I was looking for a challenge so I waited to view it. The following is what I came up with.

private IDynamic ToString(Engine engine, Args args)
{
    var thisBinding = engine.Context.ThisBinding;
    if (!(thisBinding is NumberObject) && !(thisBinding is NumberPrimitive))
    {
        throw RuntimeError.TypeError("The current 'this' must be a number or a number object.");
    }

    var num = thisBinding.ToNumberPrimitive();

    if (double.IsNaN(num))
    {
        return new StringPrimitive("NaN");
    }
    else if (double.IsPositiveInfinity(num))
    {
        return new StringPrimitive("Infinity");
    }
    else if (double.IsNegativeInfinity(num))
    {
        return new StringPrimitive("-Infinity");
    }

    var radix = !args[0].IsUndefined ? args[0].ToNumberPrimitive().Value : 10D;

    if (radix < 2D || radix > 36D)
    {
        throw RuntimeError.RangeError("The parameter [radix] must be between 2 and 36.");
    }
    else if (radix == 10D)
    {
        return num.ToStringPrimitive();
    }

    var sb = new StringBuilder();
    var isNegative = false;

    if (num < 0D)
    {
        isNegative = true;
        num = -num;
    }

    var integralPart = Math.Truncate(num);
    var decimalPart = (double)((decimal)num.Value - (decimal)integralPart);
    var radixChars = RadixMap.GetArray((int)radix);

    if (integralPart == 0D)
    {
        sb.Append('0');
    }
    else
    {
        var integralTemp = integralPart;
        while (integralTemp > 0)
        {
            sb.Append(radixChars[(int)(integralTemp % radix)]);
            integralTemp = Math.Truncate(integralTemp / radix);
        }
    }

    var count = sb.Length - 1;
    for (int i = 0; i < count; i++)
    {
        var k = count - i;
        var swap = sb[i];
        sb[i] = sb[k];
        sb[k] = swap;
    }

    if (isNegative)
    {
        sb.Insert(0, '-');
    }

    if (decimalPart == 0D)
    {
        return new StringPrimitive(sb.ToString());
    }

    var runningValue = 0D;
    var decimalIndex = 1D;
    var decimalTemp = decimalPart;

    sb.Append('.');
    while (decimalIndex < 100 && decimalPart - runningValue > 1.0e-50)
    {
        var result = decimalTemp * radix;
        var integralResult = Math.Truncate(result);
        runningValue += integralResult / Math.Pow(radix, decimalIndex++);
        decimalTemp = result - integralResult;
        sb.Append(radixChars[(int)integralResult]);
    }

    return new StringPrimitive(sb.ToString());
}

谁能解释一下为什么 dtoa.c 有大约 40 倍的代码?我简直无法想象 C# 会变得如此高效.

Can anyone with more experience in low level programming explain why dtoa.c has roughly 40 times as much code? I just cannot imagine C# being that much more productive.

推荐答案

dtoa.c 包含两个主要函数:dtoa() 将双精度数转换为字符串，strtod() 将字符串转换为双精度数.它还包含很多支持函数，其中大部分是针对它自己的任意精度算术实现的.dtoa.c 声名鹊起的是正确地进行这些转换，而这通常只能通过任意精度的算术来完成.它还具有在四种不同舍入模式下正确舍入转换的代码.

dtoa.c contains two main functions: dtoa(), which converts a double to string, and strtod(), which converts a string to a double. It also contains a lot of support functions, most of which are for its own implementation of arbitrary-precision arithmetic. dtoa.c's claim to fame is getting these conversions right, and that can only be done, in general, with arbitrary-precision arithmetic. It also has code to round conversions correctly in four different rounding modes.

您的代码仅尝试实现 dtoa() 的等价物，并且由于它使用浮点进行转换，因此并不总是正确的.(更新:见我的文章 http://www.explorebinary.com/quick-and-dirty-floating-point-to-decimal-conversion/ 了解详情.)

Your code only tries to implement the equivalent of dtoa(), and since it uses floating-point to do its conversions, will not always get them right. (Update: see my article http://www.exploringbinary.com/quick-and-dirty-floating-point-to-decimal-conversion/ for details.)

(我在我的博客上写了很多关于此的内容，http://www.exploringbinary.com/.我过去的七篇文章中有六篇都是关于 strtod() 转换的.通读它们以了解正确舍入转换是多么复杂.)

(I've written a lot about this on my blog, http://www.exploringbinary.com/ . Six of my last seven articles have been about strtod() conversions alone. Read through them to see how complicated it is to do correctly rounded conversions.)

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