imported>JJMC89 bot III: Moving :Category:Software using the GPL license to :Category:Software using the GNU General Public License per Wikipedia:Categories for discussion/Speedy

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Moving Category:Software using the GPL license to Category:Software using the GNU General Public License per Wikipedia:Categories for discussion/Speedy

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{{one source |date=March 2024}}
{{Infobox software
| name = Squawk
| logo = Duke-squeak-transparent-anti-aliased.png
| caption = The pink area is written in C/C++ while the blue area is written in java
| author =
| developer = [[Sun Microsystems]]
| released = {{Start date and age|2002|04}}
| discontinued = yes
| latest release version =
| latest release date =
| latest preview version =
| latest preview date =
| repo = {{URL|https://github.com/tomatsu/squawk}}
| operating system = [[Cross-platform]]
| programming language = [[C (programming language)|C]] and [[Java (programming language)|Java]]
| genre = [[Java virtual machine]]
| license = [[GNU General Public License]]
}}
[[File:Standard Java VM vs Squawk Java VM.svg|thumb|Visual comparison with [[HotSpot (virtual machine)|HotSpot]] ]]
'''Squawk''' is a [[Java (software platform)|Java]] [[Java ME|micro edition]] [[Java virtual machine|virtual machine]] for embedded system and small devices. Most virtual machines for the Java platform are written in low level native languages such as [[C (programming language)|C]]/[[C++]] and [[Assembly language|assembler]]; what makes Squawk different is that Squawk's core is mostly written in [[Java (programming language)|Java]] (this is called a [[Meta-circular evaluator|meta-circular interpreter]]). A Java implementation provides ease of portability, and integration of virtual machine and application resources such as objects, threads, and operating-system interfaces.

The Squawk Virtual Machine figure can be simplified as:
* Write as much of the VM in Java as possible
* Targeting small, resource constrained devices
* Enable Java for micro-embedded development
The research project was inspired by [[Squeak]]. Squawk has a [[Java Platform, Micro Edition|Java ME]] heritage and features a small [[memory footprint]].<ref>[http://research.sun.com/projects/squawk/docs/lctes03.pdf A Java Virtual Machine Architecture for Very Small Devices] {{webarchive |url=https://web.archive.org/web/20080216085123/http://research.sun.com/projects/squawk/docs/lctes03.pdf |date=February 16, 2008 }}</ref> It was developed to be simple with minimal external dependencies. Its simplicity made it portable and easy to debug and maintain. Squawk also provides an isolated mechanism by which an application is represented as an object. In Squawk, one or more applications can run in the single JVM. Conceptually, each application is completely isolated from all other applications.

==See also==
{{Portal|Free and open-source software|Computer programming}}
* [[Sun SPOT]]
* [[Jikes RVM]], another JVM written mostly in Java
* [[Rubinius]], a VM for Ruby written in Ruby
* [[MicroEJ]] VEE, another JVM written mostly in (an extended version of) Java
* [[List of Java virtual machines]]

==References==
{{Reflist}}

==External links==
*[https://web.archive.org/web/20070903053400/http://today.java.net/pub/a/today/2007/08/31/j1-2k7-mtH11.html SunSPOTs and Squawk technology Podcast]
*[https://web.archive.org/web/20080216085123/http://research.sun.com/projects/squawk/docs/lctes03.pdf A Java Virtual Machine Architecture for Very Small Devices]
*[https://web.archive.org/web/20080216085121/http://research.sun.com/projects/squawk/docs/oopsla05-squawk.pdf The Squawk Virtual Machine: Java(TM) on the Bare Metal]
*[http://developers.sun.com/learning/javaoneonline/2006/coolstuff/TS-1598.html Javaone 2006 Squawk for Wireless Sensor Networks]
*[http://hal.inria.fr/docs/00/11/36/91/PDF/courbot-uisw-05.pdf Application-Driven Customization of an Embedded Java Virtual Machine]
*[http://hal.inria.fr/docs/00/11/36/93/PDF/marquet-icess-05.pdf Ahead of time deployment in ROM of a Java-OS]
*[https://web.archive.org/web/20061022070257/http://www.sunspotworld.com/ Project Sun Spot]
*[https://web.archive.org/web/20080216085117/http://research.sun.com/projects/squawk/docs/oopsla05-squawk-poster.pdf Squawk Poster]

{{Java Virtual Machine}}
{{Java (software platform)}}

{{DEFAULTSORT:Squawk Virtual Machine}}
[[Category:Discontinued Java virtual machines]]
[[Category:Sun Microsystems software]]
[[Category:Free software programmed in C]]
[[Category:Free software programmed in Java (programming language)]]
[[Category:Software using the GNU General Public License]]

{{software-stub}}

Squawk virtual machine - Revision history

imported>JJMC89 bot III: Moving :Category:Software using the GPL license to :Category:Software using the GNU General Public License per Wikipedia:Categories for discussion/Speedy