If you are looking for the decompiler itself, visit https://github.com/jindrapetrik/jpexs-decompiler
+ update 2020: WARNING - support of the decompiler is now VERY LIMITED. There are no active developers. This means we will NOT develop new features and/or fix most of bugs. We left the tracker running in case somebody from community would like to work on it. Sorry for the inconvenience.
List of issues#1203 P-Code documents
Author: 
capasha
capashaDate created:
Type: question
Visibility: Everybody
Assigned to:
State: upgraded 
I wonder if there exists P-Code document what the P-Code does.
Like: pop, dup, ifne, ifle, getproperty, initproperty, findproperty, setproperty and so
on.
Check the links page: /www.free-decompiler.com/flash/links/
The official documentation is in this 2 files:
SWF File Format Specification (version 19): PDF Iconswf-file-format-spec.pdf (Adobe)
ActionScript Virtual Machine 2 (AVM2) Overview: PDF Iconavm2overview.pdf (Adobe)
First contains the AS1/2 actions, 2nd contains the AVM2 (AS3) Instructions.
+ there are other useful links which contains some not officially documented codes
Why is this questions developers only? May I change it to public? I think it would be
useful for others.
State: new→upgraded
I think some basic inline documentation for the p-code instructions would be handy.
But there is problem - we cannot copy parts of these two documents.
It will probably break their licenses to publish texts from them.
We will need to write pcode docs ourselves with minimum of looking into these documents,
and this will take some time. But it is generally good idea. I already thought about it in
the past.
You guys can make this public. I don't know why I made it private.
Would be great if there was a document on this site about P-code editing.
I will look in the documents that you posted.
Visibility: Developers only→Everybody