grep 方法出现在类文件中，但不在其人工转储中

问题描述

我正在寻找某个类文件 getNumBytes 中的方法 A.class：

$ grep -rn "getNumBytes"
Binary file A.class matches

当我用 javap 转储它的内容时，我看不到我的方法：

$ javap -c -p A.class > A.human
$ grep "getNumBytes" A.human # <--- nothing ... where did it go?!

这是一个完整的最小示例：

$ wget https://repo1.maven.org/maven2/com/squareup/okio/okio/2.9.0/okio-2.9.0.jar
$ mkdir FRESH_DIR
$ cd FRESH_DIR
$ unzip ../okio-2.9.0.jar
$ grep -rn "buildTrieRecursive"
Binary file okio/Options$Companion.class matches
$ javap -c -p -v -constants -l -s okio/Options$Companion.class | grep "buildTrieRecursive"

解决方法

更新我使用的是 Windows，它运行良好。我相信 Thomas Kläger 是正确的，这是一个 shell 问题：

可能是因为类名中有 $Companion。 linux shell 将其替换为 Companion 环境变量的内容 - 该变量很可能不存在并且不会被任何内容替换。尝试执行 javap -c -p -v -constants -l -s 'okio/Options$Companion.class' | grep "buildTrieRecursive"

无法重现。

javap -c -p -l -s -constants -v Options$Companion.class | grep buildTrieRecursive

输出

  #138 = Utf8               buildTrieRecursive$default
  #140 = NameAndType        #138:#139     // buildTrieRecursive$default:(Lokio/Options$Companion;JLokio/Buffer;ILjava/util/List;IILjava/util/List;ILjava/lang/Object;)V
  #141 = Methodref          #2.#140       // okio/Options$Companion.buildTrieRecursive$default:(Lokio/Options$Companion;JLokio/Buffer;ILjava/util/List;IILjava/util/List;ILjava/lang/Object;)V
  #201 = Utf8               buildTrieRecursive
  #214 = NameAndType        #201:#202     // buildTrieRecursive:(JLokio/Buffer;ILjava/util/List;IILjava/util/List;)V
  #215 = Methodref          #2.#214       // okio/Options$Companion.buildTrieRecursive:(JLokio/Buffer;ILjava/util/List;IILjava/util/List;)V
       574: invokestatic  #141                // Method buildTrieRecursive$default:(Lokio/Options$Companion;JLokio/Buffer;ILjava/util/List;IILjava/util/List;ILjava/lang/Object;)V
  private final void buildTrieRecursive(long,okio.Buffer,int,java.util.List<? extends okio.ByteString>,java.util.List<java.lang.Integer>);
       625: invokespecial #215                // Method buildTrieRecursive:(JLokio/Buffer;ILjava/util/List;IILjava/util/List;)V
       959: invokespecial #215                // Method buildTrieRecursive:(JLokio/Buffer;ILjava/util/List;IILjava/util/List;)V
  static void buildTrieRecursive$default(okio.Options$Companion,long,java.util.List,java.lang.Object);
        60: invokespecial #215                // Method buildTrieRecursive:(JLokio/Buffer;ILjava/util/List;IILjava/util/List;)V
      d2=["Lokio/Options$Companion;","","()V","intCount","Lokio/Buffer;","getIntCount","(Lokio/Buffer;)J","buildTrieRecursive","nodeOffset","node","byteStringOffset","byteStrings","Lokio/ByteString;","fromIndex","toIndex","indexes","of","Lokio/Options;","([Lokio/ByteString;)Lokio/Options;","okio"]

grep java java javap