#50 LuaTable rehash: java.lang.ArrayIndexOutOfBoundsException

[Leijing Yang]

Issue: When using set table value multitimes with some specified order, ArrayIndexOutOfBoundsException will be thrown from LuaTable rehash method. Occurs every time by using the test case.

Luaj Version: luaj jse 3.0.1

JRE Version: Java SE 7 (1.7.0_51)

Test Case:

Globals globals = JsePlatform.standardGlobals();
LuaValue chunk = globals.load(""
+ " t = {[4] = true, [5] = true, [6] = true, [3] = true}\n"
+ " t[3] = nil\n"
+ " t[2] = true\n"
+ " t[1] = true\n");
chunk.call();

Exception Stacktrace:
Exception in thread "main" org.luaj.vm2.LuaError: t = {[4] = true, [5] = true, [6] = true, [3] = true}
t[3] = nil
t[2] = true
t[1] = true
:4 vm error: java.lang.ArrayIndexOutOfBoundsException: 0
at org.luaj.vm2.LuaClosure.execute(LuaClosure.java:504)
at org.luaj.vm2.LuaClosure.call(LuaClosure.java:133)
at LuaJTest.main(LuaJTest.java:41)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
at org.luaj.vm2.LuaTable.rehash(LuaTable.java:719)
at org.luaj.vm2.LuaTable.hashset(LuaTable.java:472)
at org.luaj.vm2.LuaTable.rawset(LuaTable.java:283)
at org.luaj.vm2.LuaTable.set(LuaTable.java:272)
at org.luaj.vm2.LuaClosure.execute(LuaClosure.java:250)
... 2 more

[Leijing Yang]

patch: ignore DeadSlot copy

luaj-3.0.1/src/core/org/luaj/vm2/LuaTable.java  2015-12-17 15:14:15.000000000 +0800
+++ trunk/client/RobotJavaLuaLibs/luaj-jse-3.0.1/org/luaj/vm2/LuaTable.java 2015-12-17 15:12:37.000000000 +0800
@@ -714,7 +714,7 @@
                    StrongSlot entry = slot.first();
                    if (entry != null)
                        newArray[ k - 1 ] = entry.value();
-               } else {
+               } else if (k == 0) {
                    int j = slot.keyindex( newHashMask );
                    newHash[j] = slot.relink( newHash[j] );
                }