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List of issues#105 Infinite loops
Author: 
pepka
pepkaDate created:
Type: bug
Visibility: Everybody
Assigned to:
Labels: AS3Decompilation
State: closed 
> What steps will reproduce the problem?
If statment with an empty body inside of the loop leads to strange decompilation in the
attached sample.
> What is the expected output? What do you see instead?
do
{
if (!(var1.x + var1.y <= param1))
{
}
var2--;
}
while (var2 >= 0);
is decompiled as
do
{
if(var1.x+var1.y>param1)
{
}
var2--;
if(var2<0)
{
}
else
{
continue;
}
}
while(true);
Actually I saw such a pattern before and it still persists -
if(var2<0)
{
}
else
{
continue;
}
is wrapped into infinite loop instead of
if(var2<0)
{
break;
}
which would be still not exact decompilation but could at least save the program's
behaviour. See also another example in attachment - double_break.swf.
> What version of the product are you using? On what operating system?
1.6.0u1
empty_if.swf
State: new→opened
version 1.6.1 was released. This should be fixed.
State: opened→upgraded
Hi,
now for empty_if.swf it become more wierd:
if(!isNaN(param1))
{
while(if(var1.x+var1.y>param1)
{
}, var2--, var2>=0)
{
}
}
And for double_break.swf just persists.
State: upgraded→opened
Version 1.6.2 was released.
Loop detection algorithm is completely new, so the loop problems should be history, try
it.
State: opened→upgraded
Hi,
these two have gone! Thanks!
State: upgraded→closed