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List of issues#2687 AS2 decompilation: significant slowdown on nightly
Author: 
Randomno
RandomnoDate created:
Type: bug
Visibility: Everybody
Assigned to:
State: new 
> What steps will reproduce the problem?
Open attached file and view any class script, with "Skip detection of uninitialized class
fields" disabled.
> What is the expected output? What do you see instead?
In 25.1.3 it decompiles in around half the time of nightly 3476. For me around 5 seconds
on 25.1.3, 10 seconds on nightly.
> What version of the product are you using? Is it "nightly build"? Which operating system
do you have?
25.1.3 nightly 3476
> Please provide any additional information below. If the problem is related to a SWF
file, attach it here, otherwise we can't help you.
ui_hud.gfx (1,702 KiB)
The current nightly decompiles ActionScripts in two passes.
It needs it to properly detect switch statements and loops.
25.1.3 decompiles usually in single pass,
but it does not properly handle some switches and loops,
also loop detection algorithm is different in 25.1.3 and very slow in some corner cases.
So... yes, the nightly might appear slower, but for sake of decompilation precision.
I may introduce some optimizations in the future, but currently I do not have any.
The detection of uninitialized class fields effectively requires decompiling all scripts
in the file so that's why it takes some time.