对于 Eclipse 来说，有什么比 jad 更准确的反编译器来消除 <-MISALIGNED -> 呢？

发布于 2024-09-18 05:17:24 字数 1472 浏览 6 评论 0 原文

我使用 jad 已经很多年了，其中大部分都与 eclipse 的 Jadclipse 插件一起使用，这使得它非常有用。特别是使用“对齐代码进行调试”，它允许您查看堆栈跟踪中任何行的反编译代码。很不错。

不幸的是，我已经看到越来越多的 <- MISALIGNED -> 。注释潜入其中，这很可能是因为 jad 期望类文件按顺序排列，而 Java 6 运行时库的情况显然并非如此。因此，当写入文件时，一条指令说“这是第 100 行”，那么会写入 99 个空行，如果下一条指令说“这是第 10 行”，那么 jad 无法倒回以将该输出放在那里，而只是打印发表评论说这是在错误的地方。

以下是 HttpURLConnection 的示例：

          protected HttpURLConnection(URL url, Proxy proxy, Handler handler1)
            {
/* <-MISALIGNED-> */ /* 603*/        super(url);
/* <-MISALIGNED-> */ /* 192*/        ps = null;
/* <-MISALIGNED-> */ /* 196*/        errorStream = null;
/* <-MISALIGNED-> */ /* 199*/        setUserCookies = true;
/* <-MISALIGNED-> */ /* 200*/        userCookies = null;
/* <-MISALIGNED-> */ /* 220*/        currentProxyCredentials = null;
/* <-MISALIGNED-> */ /* 221*/        currentServerCredentials = null;
/* <-MISALIGNED-> */ /* 222*/        needToCheck = true;
/* <-MISALIGNED-> */ /* 223*/        doingNTLM2ndStage = false;
/* <-MISALIGNED-> */ /* 224*/        doingNTLMp2ndStage = false;
/* <-MISALIGNED-> */ /* 226*/        tryTransparentNTLMServer = NTLMAuthentication.supportsTransparentAuth();
/* <-MISALIGNED-> */ /* 227*/        tryTransparentNTLMProxy = NTLMAuthentication.supportsTransparentAuth();
/

现在的问题是是否有另一个反编译器可以按行生成更准确的输出。实际的反编译不需要非常出色或任何东西，但我真的很喜欢它出现在 Java Stack Trace 视图所期望的位置。如果它与 Jadclipse 配合得很好，那就更好了。

原文

I have used jad for many years, most of these with the Jadclipse plugin to eclipse which makes it quite usable. Especially with the "Align code for debugging" which allows you to see the decompiled code for any line in a stack trace. Very nice.

Unfortunately I've seen more and more that the <- MISALIGNED -> comment sneaks in, which is most likely because jad expects the classfile to be in order which clearly is not the case for the Java 6 runtime library. Hence when writing the file, and an instruction says "this is line 100" then 99 empty lines are written, and if then the next instruction says "this is for line 10" then jad cannot rewind to put that output there, but just prints out a comment that this is in the wrong place.

Here is an example for HttpURLConnection:

          protected HttpURLConnection(URL url, Proxy proxy, Handler handler1)
            {
/* <-MISALIGNED-> */ /* 603*/        super(url);
/* <-MISALIGNED-> */ /* 192*/        ps = null;
/* <-MISALIGNED-> */ /* 196*/        errorStream = null;
/* <-MISALIGNED-> */ /* 199*/        setUserCookies = true;
/* <-MISALIGNED-> */ /* 200*/        userCookies = null;
/* <-MISALIGNED-> */ /* 220*/        currentProxyCredentials = null;
/* <-MISALIGNED-> */ /* 221*/        currentServerCredentials = null;
/* <-MISALIGNED-> */ /* 222*/        needToCheck = true;
/* <-MISALIGNED-> */ /* 223*/        doingNTLM2ndStage = false;
/* <-MISALIGNED-> */ /* 224*/        doingNTLMp2ndStage = false;
/* <-MISALIGNED-> */ /* 226*/        tryTransparentNTLMServer = NTLMAuthentication.supportsTransparentAuth();
/* <-MISALIGNED-> */ /* 227*/        tryTransparentNTLMProxy = NTLMAuthentication.supportsTransparentAuth();
/

The question is now if there is another decompiler which generates more accurate output linewise. The actual decompilation does not need to be extremely great or anything, but I really like it to be where the Java Stack Trace view expects it to be. If it works well with Jadclipse, thats even better.

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盛夏尉蓝 2024-09-25 05:17:24

调试格式的问题来自 jadclipse 而不是 jad。 jad 不具备该功能。

jadclipse 插件在类名 DebugAlignWriter 中有一个小代码部分，它执行以下操作：

if((align = getAlignTarget(aLine)) != -1)
{
   if(align < curLine)
   {
      if(curLine != 0)
      {
          out.write(10);
      }
      out.write("/* <-MISALIGNED-> */ ");
      out.write(aLine);
      curLine++;
   }
   else if(align == curLine)
   {
      out.write(aLine);
   }
   else
   {
      for(; align > curLine; curLine++)
      {
          out.write(10);
      }
      out.write(aLine);
   }

}

基本上它会尝试对齐 jad 的输出。

所以根本原因是 jad 产生的输出不一定按照读取顺序。不幸的是，我无法解释为什么 jad 会这样做。根据 jad 帮助，无法控制顺序。

我在 jadclipse 中注意到，如果您设置 JadClipse->Formatting->Don't insert a newline before opening brax - 它会减少 /* <-MISALIGNED-> 的数量*/ 由于其工作方式的性质而分段。

此外，如果您选中了方法之前的输出字段选项，它可能会增加 /* <-MISALIGNED-> 的数量。 */ 段，所以避免它。

The problem with formatting for debug comes from jadclipse and not from jad. jad does not have that capability.

The jadclipse plug-in has a little code section in a class names DebugAlignWriter which does this:

if((align = getAlignTarget(aLine)) != -1)
{
   if(align < curLine)
   {
      if(curLine != 0)
      {
          out.write(10);
      }
      out.write("/* <-MISALIGNED-> */ ");
      out.write(aLine);
      curLine++;
   }
   else if(align == curLine)
   {
      out.write(aLine);
   }
   else
   {
      for(; align > curLine; curLine++)
      {
          out.write(10);
      }
      out.write(aLine);
   }

}

Basically it tries to align the output from jad.

So the root cause is that jad produces an output that is not necessarily in reading order. Unfortunately I cannot shed light on why jad acts that way. According to jad help there is no way of controlling the order.

I noticed in jadclipse that if you set JadClipse->Formatting->Don't insert a newline before opening brace - it will reduce the number of /* <-MISALIGNED-> */ segments due to the nature of how it works.

Also, if you checked the Output fields before methods option it can increase the number of /* <-MISALIGNED-> */ segments, so avoid it.