# Visual / VM Debugger

*Visual / VM Debugger* (*VDB* for short) is a simple standalone graphical 

front-end for [GDB][2] aimed to debug, not only, virtual machines. It provides

easy-to-use, easy-to-extend user interface while keeping full power of GDB 

command line and scripting facilities. 

## Features

  * integrated support for reverse-debugging

  * source-and-assembly view with detailed instruction analysis (basic blocks, 

    jump targets and so on)

  * data structure inspector

  * configurable memory view

  * integrated *GDB* command line

## Prerequisites

It is recommended to use the latest GDB built from GDB [git master][4] as it

contains changes required by *VDB*.

## Building from Source

*Visual / VM Debugger* is a part of [Smalltalk/X jv-branch][3] since 

version 8.0.0. To build VDB, just follow instructions how to [build 

Smalltalk/X jv-branch][6] and then run either:

```

./build/stx/projects/smalltalk/smalltalk --load jv:vdb --run VDBStartup

```

Or evaluate following in a workspace: 

```

Smalltalk loadPackage: 'jv:vdb'.

VDBStartup main.

"or"

VDBStartup main: #('--help')

```

## Pre-built binaries

Download and unpack latest [Smalltalk/X jv-branch toy archive][5]

and run run:

```

stx --load jv:vdb --run VDBStartup

```

Or evaluate following in a workspace: 

```

Smalltalk loadPackage: 'jv:vdb'.

VDBStartup main.

"or"

VDBStartup main: #('--help')

```

## Reporting issues

Use [Smalltalk/X jv-branch issue tracker][6] to [report issues][7] (you may need

to login using your Google account in order to submit an issue). Alternatively,

send a message to [Smalltalk/X mailing list][8]. 

## Author

Jan Vrany `<jan.vrany [at] fit.cvut.cz>`

## License

![CC-BY-NC](https://i.creativecommons.org/l/by-nc/4.0/88x31.png)

This software is licensed under [Creative Commons Attribution-NonCommercial 4.0 International License][1]. You may find a full license text in `LICENSE.txt`.

In short, you are free to:

* **Share** — copy and redistribute the material in any medium or format,

* **Adapt** — remix, transform, and build upon the material,

under the following terms: 

* **Attribution** — You must give appropriate credit, provide a link to the license, and indicate if changes were made, 

* **NonCommercial** — You may not use the software for commercial purposes.

For permissions beyond the scope of this license please contact author at 

`<jan.vrany [at] fit.cvut.cz>`

[1]: http://creativecommons.org/licenses/by-nc/4.0/

[2]: https://www.gnu.org/software/gdb/

[3]: https://swing.fit.cvut.cz/projects/stx-jv

[4]: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git

[5]: https://swing.fit.cvut.cz/jenkins/job/stx_jv/lastSuccessfulBuild/

[6]: https://swing.fit.cvut.cz/projects/stx-jv/wiki/Documentation/BuildingStXWithRakefiles

[7]: https://swing.fit.cvut.cz/projects/stx-jv/newticket

[8]: https://groups.google.com/forum/#!forum/stx-jv