确定 .class 文件是否使用调试信息编译? [英] Determine whether .class file was compiled with debug info?

问题描述

如何确定任何 Java .class 文件是否使用调试信息编译?

How can I determine for any Java .class file if that was compiled with debug info or not?

我怎样才能确切地知道使用了哪个 -g{source|lines|vars} 选项?

How can I tell exactly what -g{source|lines|vars} option was used?

推荐答案

如果您在命令行上，则 javap -l 将显示 LineNumberTable 和 LocalVariableTable(如果存在):

If you're on the command line, then javap -l will display LineNumberTable and LocalVariableTable if present:

peregrino:$ javac -d bin -g:none src/Relation.java 
peregrino:$ javap -classpath bin -l Relation 
public class Relation extends java.lang.Object{
public Relation();

peregrino:$ javac -d bin -g:lines src/Relation.java 
peregrino:$ javap -classpath bin -l Relation 
public class Relation extends java.lang.Object{
public Relation();
  LineNumberTable: 
   line 1: 0
   line 33: 4

peregrino:$ javac -d bin -g:vars src/Relation.java 
peregrino:$ javap -classpath bin -l Relation 
public class Relation extends java.lang.Object{
public Relation();

  LocalVariableTable: 
   Start  Length  Slot  Name   Signature
   0      5      0    this       LRelation;

javap -c 将显示反编译开始时的源文件:

javap -c will display the source file if present at the start of the decompilation:

peregrino:$ javac -d bin -g:none src/Relation.java 
peregrino:$ javap -classpath bin -l -c Relation | head
public class Relation extends java.lang.Object{
  ...

peregrino:$ javac -d bin -g:source src/Relation.java 
peregrino:$ javap -classpath bin -l -c Relation | head
Compiled from "Relation.java"
public class Relation extends java.lang.Object{
  ...

以编程方式，我会查看 ASM 而不是编写另一个字节码阅读器.

Programmatically, I'd look at ASM rather than writing yet another bytecode reader.

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