Share Lineage 2 GF AI Decompiler

verbrannt · July 16, 2018

Just now, eressea said:

I'm asking because of commit https://github.com/madyanov/nasc-decompiler/commit/87c177446322d3c2688ec3e53c75b216f50d2501

It's already reverted.

eressea · July 16, 2018

1 minute ago, verbrannt said:

It's already reverted.

Ah, ok :) How about boss_id - that shouldn't be global map ID or should it be?

Edited July 16, 2018 by eressea

verbrannt · July 16, 2018

11 minutes ago, eressea said:

Ah, ok :) How about boss_id - that shouldn't be global map ID or should it be?

Idk. I have only one occurrence of this variable in my ai.obj files, so can't tell.

Also I think boss_pch.txt should be renamed to gm_pch.txt. "Boss" prefix is misleading here.

Edited July 16, 2018 by verbrannt

eressea · July 16, 2018

5 hours ago, verbrannt said:

Idk. I have only one occurrence of this variable in my ai.obj files, so can't tell.

Something tells me it should be int - objectID/index of NPC who is boss for the group, but I'm really not sure about that

5 hours ago, verbrannt said:

Also I think boss_pch.txt should be renamed to gm_pch.txt. "Boss" prefix is misleading here.

+1 maybe globalmap_pch.txt... OR maybe parse all of them from manual_pch.txt - that would be the best way

pada · July 17, 2018

Comments inside ai.obj like
// -- test comment --

ect, causes the decompiler to throw errors like "Decompile default_npcPHP Fatal error: Uncaught TypeError: Argument 1 passed to Parser::fixTypeCase() must be of the type string, null given, "

but if the comments are removed, it decompiles fine. If at all possible can support for these types of comments be added?, l2npc handles them fine

verbrannt · July 17, 2018

Comment from the start of the string? Can you post a part/class of your ai.obj where it fails. I'll fix it.

MasterToma · July 17, 2018

After adding C1 support, I've compared all ai.obj from original one, and after decompilation/compilation. There is bunch of classes (about 15 of them of 2200) with 2 significant differences.

Here is one example of 1 style of difference. Could you check, what's the problem here?

https://drive.google.com/open?id=1WZx4FGF_FrkAOkem3bC8Stdd3Y--ixUj

Most probably the same thing is in other chronicles, since looks like it's related with some nested if() conditions

verbrannt · July 17, 2018

7 minutes ago, MasterToma said:

After adding C1 support, I've compared all ai.obj from original one, and after decompilation/compilation. There is bunch of classes (about 15 of them of 2200) with 2 significant differences.

Here is one example of 1 style of difference. Could you check, what's the problem here?

https://drive.google.com/open?id=1WZx4FGF_FrkAOkem3bC8Stdd3Y--ixUj

Most probably the same thing is in other chronicles, since looks like it's related with some nested if() conditions

Looks like nothing serious, only one missing shift stack pointer command :D
I think is always at the end of the handlers?
Can you post second type of difference?

MasterToma · July 17, 2018

	push_reg_sp
	fetch_i

is missed in files from the link, which I posted. Also two jumps at the end

    jump L23975
    jump L23982
L23977
L23982
L23975
    shift_sp -1

I think, there is no "no op" operands, and those lines are simply missed from the decompiled/compiled code. Doesn't look good for me. Also, shift_sp -1 is called before exit_handler(). So, caller will receive not-shifted stack

I will post second difference, when find some smaller handler for it, right now there are about 30kb obj files

Edited July 17, 2018 by MasterToma

jornik · July 17, 2018

@MasterToma can you please post whole hander code for the original and compiled ai.obj? Can you also share decompiled code?

verbrannt · July 17, 2018

2 hours ago, MasterToma said:
	push_reg_sp
	fetch_i
is missed in files from the link, which I posted. Also two jumps at the end
    jump L23975
    jump L23982
L23977
L23982
L23975
    shift_sp -1
I think, there is no "no op" operands, and those lines are simply missed from the decompiled/compiled code. Doesn't look good for me. Also, shift_sp -1 is called before exit_handler(). So, caller will receive not-shifted stack

I will post second difference, when find some smaller handler for it, right now there are about 30kb obj files

I think last “if” in this class should be “select” with one case inside. Jumps looks like “break” inside that case.

I can’t test it today tho.

MasterToma · July 17, 2018

1 hour ago, jornik said:

@MasterToma can you please post whole hander code for the original and compiled ai.obj? Can you also share decompiled code?

Everything is inside archive under the link, which I posted. Here it is again:

https://drive.google.com/file/d/1WZx4FGF_FrkAOkem3bC8Stdd3Y--ixUj/view

Decompiled code looks is

class guard_babenco : guard_fixed {
handler:
	EventHandler TALK_SELECTED(talker) {
		if (_from_choice == 0) {
			if (HaveMemo(talker, @path_to_elven_scout) == 1 && GetMemoState(talker, @path_to_elven_scout) == 1) {
				_choiceN = _choiceN + 1;
				_code = 0;
				AddChoice(0, "询问有关废墟的事");
			}

			if (_choiceN > 1) {
				ShowChoicePage(talker, 1);
				return;
			}
		}

		if (_from_choice || _choiceN == 1) {
			if (_code == 0) {
				if (_from_choice == 0 || HaveMemo(talker, @path_to_elven_scout) == 1 && GetMemoState(talker, @path_to_elven_scout) == 1) {
					ShowPage(talker, "guard_babenco_q0407_01.htm");
				}
			}

			return;
		}

		super;
	}
}

There is some mess with _from_choice. Tonight I will try to decompile it manually.

verbrannt · July 17, 2018

1 hour ago, MasterToma said:

There is some mess with _from_choice. Tonight I will try to decompile it manually.

Replace

if (_code == 0) {
    if (_from_choice == 0 || HaveMemo(talker, @path_to_elven_scout) == 1 && GetMemoState(talker, @path_to_elven_scout) == 1) {
        ShowPage(talker, "guard_babenco_q0407_01.htm");
    }
}

with

select (_code) {
    case 0:
        if (_from_choice == 0 || HaveMemo(talker, @path_to_elven_scout) == 1 && GetMemoState(talker, @path_to_elven_scout) == 1) {
            ShowPage(talker, "guard_babenco_q0407_01.htm");
        }
        
        break;
}

& check compiled code

MasterToma · July 17, 2018

Ok, now it works. Another bug with operator precedence. For instance, look at blacksmith_duning (code is too large).

Here is how it should look like:

	fetch_i
	push_const 10
	mod
	mul
	greater_equal

			else if(reply == 6)
				{
					if (OwnItemCount(talker, @q_gold_wyvern) >= (4*(talker.param2 % 10)))
					{
						DeleteItem1(talker, @q_gold_wyvern, 4*(talker.param2 % 10));
						talker.param1 = talker.param1+((Rand(3)+1)*16);
					}
					else
						ShowPage(talker, "blacksmith_duning_q0336_10.htm");	
				}

Note about two points

1. (4*(talker.param2 % 10))

2. ((Rand(3)+1)*4)

Decompiler generates

} else if (reply == 6) {
				if (OwnItemCount(talker, @q_gold_wyvern) >= 4 * talker.param2 % 10) {
					if (GetCurrentTick() - talker.quest_last_reward_time > 1) {
						DeleteItem1(talker, @q_gold_wyvern, 4 * talker.param2 % 10);
						talker.param1 = talker.param1 + (Rand(3) + 1) * 4;
						talker.param1 = talker.param1 + (Rand(3) + 1) * 16;
					}
				} else {
					ShowPage(talker, "blacksmith_duning_q0336_10.htm");
				}

1. 4 * talker.param2 % 10

2. (Rand(3) + 1) * 4

While point #2 in THIS case is not crucial (but in other cases it might be crucial), point #1 is for sure wrongly decompiled - extra () are missed and cause wrong calculation, which will be

	fetch_i
	mul
	push_const 10
	mod
	greater_equal

MasterToma · July 17, 2018

I've noticed the same with nested &&. Original pseudo-code

if (a && (c && d))

after decompilation will be

if (a && c && d)

Which is OK. But some times not:

if (a && (c || d))

goes into

if (a && c || d)

Trying to find some nice example...

Share Lineage 2 GF AI Decompiler

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