Lua 5.2 compatibility fixes.

test/java/org/luaj/luajc/SampleMainChunk.java

@@ -0,0 +1,61 @@
+package org.luaj.luajc;
+
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.Varargs;
+import org.luaj.vm2.lib.TwoArgFunction;
+import org.luaj.vm2.lib.VarArgFunction;
+
+public class SampleMainChunk extends VarArgFunction {
+
+	static final LuaValue $print = valueOf("print");
+	static final LuaValue $foo = valueOf("foo");
+	
+	LuaValue[] rw_ENV;  // The environment when it is read-write
+//	LuaValue ro_ENV;  // The environment when it is read-only in all sub-functions
+	
+	LuaValue[] rw_openup1;  // upvalue that we create and modify in "slot" 1, passed to sub-function in initer.
+	LuaValue[] rw_openup2;  // array is instantiated on first set or before supply to closure, after that value is get, set.
+	LuaValue[] rw_openup3;  // closing these nulls them out, sub-functions still retain references to array & can use
+	LuaValue ro_openup4;  // open upvalue that is read-only once it is supplied to an inner function.
+	LuaValue ro_openup5;  // closing this also nulls it out.
+	
+	// Must have this in the main chunk so it can be loaded and instantiated on all platforms.
+	public SampleMainChunk() {
+	}
+	
+	public void initupvalue1(LuaValue[] v) {
+		this.rw_ENV = v;
+	}
+
+	public Varargs invoke(Varargs args) {
+		rw_ENV[0].get($print).call($foo);
+		
+		rw_ENV[0].set($print, new InnerFunction(rw_openup3, rw_openup1, ro_openup5));
+		
+		return null;
+	}
+	
+	static class InnerFunction extends TwoArgFunction {
+		static final LuaValue $print = valueOf("print"); // A constant, named for what it is.
+		static final LuaValue $foo = valueOf("foo");
+		
+		final LuaValue[] rw_upvalue1;  // from enclosing function, corresponds to upvaldesc not instack.
+		final LuaValue[] rw_upvalue2;  // from enclosing function, corresponds to upvaldesc not instack.
+		final LuaValue ro_upvalue3;  // from enclosing function, but read-only everywhere.
+
+		LuaValue[] rw_openup1;  // closing these nulls them out, sub-functions still retain references to array & can use
+		LuaValue ro_openup2;  // open upvalue that is read-only once it is supplied to an inner function.
+
+		InnerFunction(LuaValue[] rw_upvalue1, LuaValue[] rw_upvalue2, LuaValue ro_upvalue3) {
+			this.rw_upvalue1 = rw_upvalue1;
+			this.rw_upvalue2 = rw_upvalue2;
+			this.ro_upvalue3 = ro_upvalue3;
+		}
+
+		public LuaValue call(LuaValue arg1, LuaValue arg2) {
+			return NIL;
+		}
+		
+	}
+
+}