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QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.

Stéphane DucasseStephane.Ducasse@univ-savoie.frhttp://www.listic.univ-savoie.fr/~ducasse/

The VisualWorks Environment

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License: CC-Attribution-ShareAlike 2.0http://creativecommons.org/licenses/by-sa/2.0/

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Smalltalk Run-Time Architecture• Virtual Machine + Image + Changes and Sources

• Image = bytecodes• Sources and changes = code (text)

A byte-code interpreter:the virtual machine interpretes the imageIMAGE2.IMIMAGE2.CHAStandard SOURCESShared by everybody

IMAGE1.IMIMAGE1.CHAAll the objects of the systemat a moment in time

One per user+

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Runtime Architecture• The byte-code is in fact translated into native code by

a just-in-time compiler. • The source and the changes are not necessary for

interpreting the byte-code, this is just for the development. Normally they are removed for deployment.

• An application can be delivered as some byte-code files that will be executed with a VM. The development image is stripped to remove the unnecessary development components.

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Mouse Semantics

SelectOperateWindowRed BlueYellow

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Launcher

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Browsing a class

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Browsing methods

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Inspector• To look inside objects• anObject inspect

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Debugger!!!

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ChangeList To recover from power failure!!

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SUnit: TestRunner open

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Tests...

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Workspace: to edit code snippet

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Integrated version management Check in / outBack end postgres/oracleBased on packages and bundles

no scope only deployment/source management concepts

Store

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Published Items

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Package: Versioning Code

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Change your Mind• Everything you do is recorded !!• So try and learn how to recover your code

• You are smart so – experiment, – learn for you, browse, – all the code is there