JVM Bytecode Viewer

An extension that shows the JVM Bytecode for a given .class file.

This extension uses the javap program that comes with the Java JDK; make sure it is accessible from the PATH environmental variable.

The bytecode output windows are automatically updated when the .class file is changed on disk.

Usage

First open a compiled .class file, then do one of the following:

Click the Show JVM Bytecode in the title bar.
Hold alt and click the Show JVM Bytecode (Verbose) button in the title bar.
Right-click the file in the title bar and click Show JVM Bytecode or Show JVM Bytecode (Verbose).
Right-click the file in the explorer and click Show JVM Bytecode or Show JVM Bytecode (Verbose).

To show the bytecode of a .class file that is inside a jar, you must first open the jar file. To open the Jar file:

The contents of the Jar file will be shown in a tree view titled Jar Explorer in the side panel.

The Jar file can be closed by right-clicking the Jar file in the Jar Explorer and clicking Close Jar File

Option	Description	Default
`jvm-bytecode-viewer.defaultToVerboseOutput`	Whether the title bar button opens the verbose output by default	`false`
`jvm-bytecode-viewer.editorTitleBar`	Whether to show commands in the editor title bar menu	`true`
`jvm-bytecode-viewer.editorTitleBarContextMenu`	Whether to show commands in the editor title bar context menu	`true`
`jvm-bytecode-viewer.explorerContextMenu`	Whether to show commands in the explorer context menu	`true`

Example

Verbose Example

(VSCode Color Theme Used: Golden Dracula)

This extension was tested with the JDK 14 version of javap.
The verbose output of javap is significantly more complicated than the normal output so there may be some inconsistencies with its highlighting.
If you see highlighting that you think is incorrect, please submit an issue with a screenshot.
The Jar exploration code was adapted from https://github.com/stef-levesque/vscode-zipexplorer