Add loadstring and other standard library commands (untested)

src/main/java/lua/Builtin.java

@@ -7,6 +7,7 @@ import java.io.OutputStream;
 import java.io.PrintStream;
 
 import lua.value.LFunction;
+import lua.value.LNil;
 import lua.value.LTable;
 import lua.value.LValue;
 
@@ -17,13 +18,19 @@ final class Builtin extends LFunction {
 			table.put( NAMES[i], new Builtin(i) );
 	}
 
+	private static final String[] NAMES = { 
+		"print", 
+		"pairs", 
+		"getmetatable", 
+		"setmetatable", 
+		"type", 
+		"pcall" };
 	private static final int PRINT = 0;
 	private static final int PAIRS = 1;
 	private static final int GETMETATABLE = 2;
 	private static final int SETMETATABLE = 3;
 	private static final int TYPE = 4;
-	
-	private static final String[] NAMES = { "print", "pairs", "getmetatable", "setmetatable", "type" };
+	private static final int PCALL = 5;
 	
 	private static PrintStream stdout = System.out;
 	
@@ -63,6 +70,10 @@ final class Builtin extends LFunction {
 		case TYPE:
 			vm.setResult( vm.getArg(0).luaGetType() );
 			break;
+		case PCALL:
+			// TODO: implement pcall
+			vm.setResult( LNil.NIL );
+			break;
 		default:
 			luaUnsupportedOperation();
 		}

src/main/java/lua/VM.java

@@ -140,4 +140,10 @@ public interface VM {
 	 */
 	public void setResult(LValue val);
 
+	
+	/**
+	 * Generates a Lua error.   The error message(which can actually be a Lua value of any type)
+	 * must be on the top of the stack.
+	 */
+	public void lua_error();
 }