didn't find a local variable: are you sure you called your f

[Captain Segfault]

The following code produces an exception:

Code: Select all

import java.util.Random;

public class wtfbot {
    public int orderType = 1; // always a move order
    public double destX, destY; // the move order will use these fields to communicate a destination
    public int[] radio = new int[4];

    public Object think(double dx, double dy, double x, double y, boolean moving, int terrain,
            int ourID, double hp, double maxHP, double range, double time,
            double[] objX, double[] objY, int[] objID, int[] objFaction, int[] objType, int[][] incomingRadio) {
        if (true) {
            int i0 = 0;
            int i1 = 0;
            double d0 = 0.0;
        }
        if (true ) {
            double d1 = 100000000;
            boolean boolwtf = false;
            double d2 = 100.0;
            if (boolwtf)
                d1 =42;

        }
        return this;
    }
    
    public int build(double dx, double dy, double x, double y, int terrain, int id, int buildItem,
            double hp, double maxHP, double time,
            double[] objX, double[] objY, int[] objID, int[] objFaction, int[] objType, int[][] incomingRadio) {
        return 1;
    }
}

The exception:

Code: Select all

didn't find a local variable: are you sure you called your function with correct args?
failure to think: ojvm.data.JavaException null
ojvm.data.JavaException
        at ojvm.operations.Exceptions.makeAndThrow(Exceptions.java:40)
        at ojvm.machine.ControlUnit.makeAndThrow(ControlUnit.java:212)
        at ojvm.operations.BytecodeInterpreter.visit_iload(BytecodeInterpreter.java:1509)
        at ojvm.loading.instructions.Ins_iload.accept(Ins_iload.java:32)
        at ojvm.machine.ControlUnit.run(ControlUnit.java:167)
        at org.hacker.engine.war.HackVMWarSpinalCord.think(HackVMWarSpinalCord.java:134)
        at org.hacker.engine.war.Faction.think(Faction.java:136)
        at org.hacker.engine.war.WarModel.step(WarModel.java:68)
        at org.hacker.engine.GameUI.stepToIt(GameUI.java:166)
        at org.hacker.engine.GameUI$5.run(GameUI.java:99)

Took a while to track this down this evening...

I suspect that the interpreter's handling of booleans is the root problem here. I had some problems with them in worm also...

[adum]

whew, this was an interesting bug to track down! turns out that under certain rare conditions, reuse of local variables for different types would cause it to invalidate some memory. i think i have fixed this -- the new SDK v 242 should work on this code.

this wasn't a problem with booleans, but i think i have seen that one before too. if you see it again, please post some sample code and i'll fix it.

thanks,
adum