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List of issues#1334 For loops converts automatic to while loops
Author: 
capasha
capashaDate created:
Type: bug
Visibility: Everybody
Assigned to:
State: closed 
> What steps will reproduce the problem?
I'm trying to make for loops in pcode. But the problem is, it automatic changes to while
loops.
Here as an example:
as3 code:
var w:int = 25;
var h:int = 25;
var x:int = 0;
var y:int = 0;
for(x = 0; x < w; x++)
{
for(y = 0; y < h; y++)
{
trace(x + " " + y);
}
}
pcode for loop:
pushbyte 25
convert_i
setlocal_1
pushbyte 25
convert_i
setlocal_2
pushbyte 0
convert_i
setlocal_3
pushbyte 0
convert_i
setlocal 4
pushbyte 0
convert_i
setlocal_3
jump ofs0073
ofs0042:label
pushbyte 0
convert_i
setlocal 4
jump ofs0066
ofs004e:label
findpropstrict Qname(PackageNamespace(""),"trace")
getlocal_3
pushstring " "
add
getlocal 4
add
callproperty Qname(PackageNamespace(""),"trace") 1
pop
getlocal 4
increment_i
convert_i
setlocal 4
ofs0066:getlocal 4
getlocal_2
iflt ofs004e
getlocal_3
increment_i
convert_i
setlocal_3
ofs0073:getlocal_3
getlocal_1
iflt ofs0042
Ends in the other swf as while loops (Doesn't work)
y = 0;
x = 0;
w = 25;
h = 25;
while(x < w)
{
y = 0;
§§pop();
while(y < h)
{
continue;
§§push(y + 1);
}
continue;
§§push(x + 1);
}
> What is the expected output? What do you see instead?
I want for loops. Because while loops doesn't work for me, it always send out 0.
> What version of the product are you using? Is it "nightly build"? Which operating system
do you have?
FFDEC 10.0.0 Nightly Build 1627
> Please provide any additional information below. If the problem is related to a SWF
file, attach it here, otherwise we can't help you.
"I want for loops. Because while loops doesn't work for me, it always send out 0."
Then the problem is with your pcode.
The for/while loop is only a decompilation of the pcode. Maybe the decompiling is buggy,
you are right, but it won't solve your problem if we fix this issue.
for(var i:int=0; i<n; i++) {
test();
}
if fully compatible with:
var i:int = 0;
while (i<n) {
test();
i++;
}
(and copmatible with:
for(var i:int=0; i<n; ) {
test();
i++;
}
etc..)
So if you compile both source code I'm sure that the result is the same pcode (at least in
release mode).
So it is not possible decopile exactly the same AS script which was before the compile in
Adobe Flash. Ok, we can assume sometimes that it was a for loop, and we do that (which is
maybe buggy as you wrote), but in this case it can happen that a while loop is decompiled
as a for loop. It is normal.
If your pcode returns 0, it will be the same when we fix the for loop
decetion/decompilation.
So try to fix your pcode.
I have tried everything. Still returns 0 every time. It's something wrong with the
increasing variable.
I am closing this one since we can't probably help you with this and it is a long time -
you are not probably even interested.
State: new→closed