fix bug: invoke overload method disorder

fix invoke java overload method disorder problem

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2007 LuaJ. All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -12,16 +12,13 @@ on.<br>
 -- Benjamin P. Jung, Jan. 26th 2018
 </div>
 
-<h1>Getting Started with LuaJ</h1>
-
-
 <h1>Getting Started with LuaJ</h1>
 James Roseborough, Ian Farmer, Version 3.0.2
 <p>
 <small>
 Copyright &copy; 2009-2014 Luaj.org.
 Freely available under the terms of the
-<a href="http://sourceforge.net/dbimage.php?id=196142">Luaj license</a>.
+<a href="LICENSE">Luaj license</a>.
 </small>
 <hr>
 <p>
@@ -186,7 +183,7 @@ It is also faster than Java-lua implementations Jill, Kahlua, and Mochalua for a
 From the main distribution directory line type:
 
 <pre>
-	java -cp lib/luaj-jse-3.0.2.jar lua examples/lua/hello.lua
+	java -cp luaj-jse-3.0.2.jar lua examples/lua/hello.lua
 </pre>
 
 <p>
@@ -198,7 +195,7 @@ You should see the following output:
 To see how luaj can be used to acccess most Java API's including swing, try:
 
 <pre>
-	java -cp lib/luaj-jse-3.0.2.jar lua examples/lua/swingapp.lua
+	java -cp luaj-jse-3.0.2.jar lua examples/lua/swingapp.lua
 </pre>
 
 <p>
@@ -213,8 +210,8 @@ Links to sources:<pre>
 From the main distribution directory line type:
 
 <pre>
-	java -cp lib/luaj-jse-3.0.2.jar luac examples/lua/hello.lua
+	java -cp luaj-jse-3.0.2.jar luac examples/lua/hello.lua
-	java -cp lib/luaj-jse-3.0.2.jar lua luac.out
+	java -cp luaj-jse-3.0.2.jar lua luac.out
 </pre>
 
 <p>
@@ -228,8 +225,8 @@ Luaj can compile lua sources or binaries directly to java bytecode if the bcel l
 
 <pre>
 	ant bcel-lib
-	java -cp &quot;lib/luaj-jse-3.0.2.jar;lib/bcel-5.2.jar&quot; luajc -s examples/lua -d . hello.lua
+	java -cp &quot;luaj-jse-3.0.2.jar;lib/bcel-5.2.jar&quot; luajc -s examples/lua -d . hello.lua
-	java -cp &quot;lib/luaj-jse-3.0.2.jar;.&quot; lua -l hello
+	java -cp &quot;luaj-jse-3.0.2.jar;.&quot; lua -l hello
 </pre>
 
 <p>
@@ -240,7 +237,7 @@ but the compiled classes must be in the class path at runtime, unless runtime ji
 <p>
 Lua scripts can also be run directly in this mode without precompiling using the <em>lua</em> command with the <b><em>-b</em></b> option and providing the <em>bcel</em> library in the class path:
 <pre>
-	java -cp &quot;lib/luaj-jse-3.0.2.jar;lib/bcel-5.2.jar&quot; lua -b examples/lua/hello.lua
+	java -cp &quot;luaj-jse-3.0.2.jar;lib/bcel-5.2.jar&quot; lua -b examples/lua/hello.lua
 </pre>
 
 
@@ -284,7 +281,7 @@ A simple example may be found in
 </pre>
 
 <p>
-You must include the library <b>lib/luaj-jse-3.0.2.jar</b> in your class path.
+You must include the library <b>luaj-jse-3.0.2.jar</b> in your class path.
 
 <h2>Run a script in a MIDlet</h2>
 
@@ -311,7 +308,7 @@ A simple example may be found in
 </pre>
 
 <p>
-You must include the library <b>lib/luaj-jme-3.0.2.jar</b> in your midlet jar.
+You must include the library <b>luaj-jme-3.0.2.jar</b> in your midlet jar.
 
 <p>
 An ant script to build and run the midlet is in
@@ -341,7 +338,7 @@ You can also look up the engine by language "lua" or mimetypes "text/lua" or "ap
 All standard aspects of script engines including compiled statements are supported.
 
 <p>
-You must include the library <b>lib/luaj-jse-3.0.2.jar</b> in your class path.
+You must include the library <b>luaj-jse-3.0.2.jar</b> in your class path.
 
 <p>
 A working example may be found in
@@ -352,8 +349,8 @@ A working example may be found in
 To compile and run it using Java 1.6 or higher:
 
 <pre>
-	javac -cp lib/luaj-jse-3.0.2.jar examples/jse/ScriptEngineSample.java
+	javac -cp luaj-jse-3.0.2.jar examples/jse/ScriptEngineSample.java
-	java -cp &quot;lib/luaj-jse-3.0.2.jar;examples/jse&quot; ScriptEngineSample
+	java -cp &quot;luaj-jse-3.0.2.jar;examples/jse&quot; ScriptEngineSample
 </pre>
 
 <h2>Excluding the lua bytecode compiler</h2>
@@ -415,7 +412,7 @@ and the math operations include all those supported by Java SE.
 Android applications should use the JsePlatform, and can include the <a href="#luajava">Luajava</a> library 
 to simplify access to underlying Android APIs.  
 A specialized Globals.finder should be provided to find scripts and data for loading.
-See <a href="examples/android/src/android/LuajView">examples/android/src/android/LuajView</a>
+See <a href="examples/android/src/android/LuajView.java">examples/android/src/android/LuajView.java</a>
 for an example that loads from the "res" Android project directory.
 The ant build script is <a href="examples/android/build.xml">examples/android/build.xml</a>.  
 
@@ -593,7 +590,7 @@ The following lua script will open a swing frame on Java SE:
 See a longer sample in <em>examples/lua/swingapp.lua</em> for details, including a simple animation loop, rendering graphics, mouse and key handling, and image loading. 
 Or try running it using: 
 <pre>
-	java -cp lib/luaj-jse-3.0.2.jar lua examples/lua/swingapp.lua
+	java -cp luaj-jse-3.0.2.jar lua examples/lua/swingapp.lua
 </pre>
 
 <p>
@@ -930,7 +927,7 @@ Files are no longer hosted at LuaForge.
 <li>Enhance javadoc, put it <a href="docs/api/index.html">in distribution</a> 
 and at <a href="http://luaj.sourceforge.net/api/2.0/index.html">http://luaj.sourceforge.net/api/2.0/</a></li>
 <li>Major refactor of luajava type coercion logic, improve method selection.</li> 
-<li>Add lib/luaj-sources-2.0.2.jar for easier integration into an IDE such as Netbeans </li>
+<li>Add luaj-sources-2.0.2.jar for easier integration into an IDE such as Netbeans </li>
 
 <tr valign="top"><td>&nbsp;&nbsp;<b>2.0.3</b></td><td><ul>
 <li>Improve coroutine state logic including let unreferenced coroutines be garbage collected </li>

build.xml

@@ -82,17 +82,21 @@
 			<pathelement path="lib/mmapi.jar"/>
 		</path>
 		<javac destdir="build/jme/classes" encoding="utf-8" source="1.3" target="1.2" bootclasspathref="wtk-libs"
+		    debug="on"
 			srcdir="build/jme/src"/>
 		<javac destdir="build/jse/classes" encoding="utf-8" source="1.3" target="1.3"
 			classpath="lib/bcel-5.2.jar"
+			debug="on"
 			srcdir="build/jse/src"
 			excludes="**/script/*,**/Lua2Java*,**/server/*,lua*"/>
 		<javac destdir="build/jse/classes" encoding="utf-8" source="1.5" target="1.5"
 			classpath="build/jse/classes"
+			debug="on"
 			srcdir="build/jse/src"
 			includes="**/script/*,**/Lua2Java*,**/server/*"/>
 		<javac destdir="build/jse/classes" encoding="utf-8" source="1.3" target="1.3"
 			classpath="build/jse/classes"
+			debug="on"
 			srcdir="build/jse/src"
 			includes="lua*"/>
 	</target>

src/core/org/luaj/vm2/LoadState.java

@@ -155,7 +155,6 @@ public class LoadState {
 	private static final LuaValue[]     NOVALUES    = {};
 	private static final Prototype[] NOPROTOS    = {};
 	private static final LocVars[]   NOLOCVARS   = {};
-	private static final LuaString[]  NOSTRVALUES = {};
 	private static final Upvaldesc[]  NOUPVALDESCS = {};
 	private static final int[]       NOINTS      = {};
 	

src/core/org/luaj/vm2/Lua.java

@@ -80,7 +80,6 @@ public class Lua {
 	public static final int POS_Bx		= POS_C;
 	public static final int POS_Ax		= POS_A;
 
-
 	public static final int MAX_OP          = ((1<<SIZE_OP)-1);
 	public static final int MAXARG_A        = ((1<<SIZE_A)-1);
 	public static final int MAXARG_B        = ((1<<SIZE_B)-1);
@@ -94,6 +93,7 @@ public class Lua {
 	public static final int MASK_B  = ((1<<SIZE_B)-1)<<POS_B;
 	public static final int MASK_C  = ((1<<SIZE_C)-1)<<POS_C;
 	public static final int MASK_Bx = ((1<<SIZE_Bx)-1)<<POS_Bx;
+	public static final int MASK_Ax = ((1<<SIZE_Ax)-1)<<POS_Ax;
 
 	public static final int MASK_NOT_OP = ~MASK_OP;
 	public static final int MASK_NOT_A  = ~MASK_A;
@@ -208,7 +208,7 @@ public class Lua {
 
 	public static final int OP_CONCAT = 22; /*	A B C	R(A) := R(B).. ... ..R(C)			*/
 
-	public static final int OP_JMP = 23; /*	sBx	pc+=sBx					*/
+	public static final int OP_JMP = 23; /*	A sBx	pc+=sBx; if (A) close all upvalues >= R(A - 1)	*/
 	public static final int OP_EQ = 24; /*	A B C	if ((RK(B) == RK(C)) ~= A) then pc++		*/
 	public static final int OP_LT = 25; /*	A B C	if ((RK(B) <  RK(C)) ~= A) then pc++  		*/
 	public static final int OP_LE = 26; /*	A B C	if ((RK(B) <= RK(C)) ~= A) then pc++  		*/

src/core/org/luaj/vm2/LuaClosure.java

@@ -21,6 +21,8 @@
 ******************************************************************************/
 package org.luaj.vm2;
 
+import org.luaj.vm2.lib.DebugLib.CallFrame;
+
 /**
  * Extension of {@link LuaFunction} which executes lua bytecode.
  * <p>
@@ -214,6 +216,17 @@ public class LuaClosure extends LuaFunction {
 					stack[a] = k[i>>>14];
 					continue;
 					
+				case Lua.OP_LOADKX:/*	A 	R(A) := Kst(extra arg)					*/
+					++pc;
+					i = code[pc];
+					if ((i & 0x3f) != Lua.OP_EXTRAARG) {
+						int op = i & 0x3f;
+						throw new LuaError("OP_EXTRAARG expected after OP_LOADKX, got " +
+							(op < Print.OPNAMES.length - 1 ? Print.OPNAMES[op] : "UNKNOWN_OP_" + op));
+					}
+					stack[a] = k[i>>>6];
+					continue;
+					
 				case Lua.OP_LOADBOOL:/*	A B C	R(A):= (Bool)B: if (C) pc++			*/
 	                stack[a] = (i>>>23!=0)? LuaValue.TRUE: LuaValue.FALSE;
 	                if ((i&(0x1ff<<14)) != 0)
@@ -309,7 +322,7 @@ public class LuaClosure extends LuaFunction {
 					}
 					continue;
 					
-				case Lua.OP_JMP: /*	sBx	pc+=sBx					*/
+				case Lua.OP_JMP: /*	A sBx	pc+=sBx; if (A) close all upvalues >= R(A - 1)	*/
 					pc  += (i>>>14)-0x1ffff;
 					if (a > 0) {
 						for (--a, b = openups.length; --b>=0; )
@@ -404,7 +417,7 @@ public class LuaClosure extends LuaFunction {
 					{
 			            LuaValue limit = stack[a + 1];
 						LuaValue step  = stack[a + 2];
-						LuaValue idx   = step.add(stack[a]);
+						LuaValue idx   = stack[a].add(step);
 			            if (step.gt_b(0)? idx.lteq_b(limit): idx.gteq_b(limit)) {
 		                    stack[a] = idx;
 		                    stack[a + 3] = idx;
@@ -536,8 +549,24 @@ public class LuaClosure extends LuaFunction {
 	}
 
 	private void processErrorHooks(LuaError le, Prototype p, int pc) {
-		le.fileline = (p.source != null? p.source.tojstring(): "?") + ":" 
+		String file = "?";
-			+ (p.lineinfo != null && pc >= 0 && pc < p.lineinfo.length? String.valueOf(p.lineinfo[pc]): "?");
+		int line = -1;
+		{
+			CallFrame frame = null;
+			if (globals != null && globals.debuglib != null) {
+				frame = globals.debuglib.getCallFrame(le.level);
+				if (frame != null) {
+					String src = frame.shortsource();
+					file = src != null ? src : "?";
+					line = frame.currentline();
+				}
+			}
+			if (frame == null) {
+				file = p.source != null? p.source.tojstring(): "?";
+				line = p.lineinfo != null && pc >= 0 && pc < p.lineinfo.length ? p.lineinfo[pc] : -1;
+			}
+		}
+		le.fileline = file + ":" + line;
 		le.traceback = errorHook(le.getMessage(), le.level);
 	}
 	

src/core/org/luaj/vm2/LuaDouble.java

@@ -206,28 +206,28 @@ public class LuaDouble extends LuaNumber {
 	}
 
 	// relational operators
-	public LuaValue   lt( LuaValue rhs )         { return rhs.gt_b(v)? LuaValue.TRUE: FALSE; }
+	public LuaValue   lt( LuaValue rhs )         { return rhs instanceof LuaNumber ? (rhs.gt_b(v)? TRUE: FALSE) : super.lt(rhs); }
 	public LuaValue   lt( double rhs )      { return v < rhs? TRUE: FALSE; }
 	public LuaValue   lt( int rhs )         { return v < rhs? TRUE: FALSE; }
-	public boolean lt_b( LuaValue rhs )       { return rhs.gt_b(v); }
+	public boolean lt_b( LuaValue rhs )       { return rhs instanceof LuaNumber ? rhs.gt_b(v) : super.lt_b(rhs); }
 	public boolean lt_b( int rhs )         { return v < rhs; }
 	public boolean lt_b( double rhs )      { return v < rhs; }
-	public LuaValue   lteq( LuaValue rhs )       { return rhs.gteq_b(v)? LuaValue.TRUE: FALSE; }
+	public LuaValue   lteq( LuaValue rhs )       { return rhs instanceof LuaNumber ? (rhs.gteq_b(v)? TRUE: FALSE) : super.lteq(rhs); }
 	public LuaValue   lteq( double rhs )    { return v <= rhs? TRUE: FALSE; }
 	public LuaValue   lteq( int rhs )       { return v <= rhs? TRUE: FALSE; }
-	public boolean lteq_b( LuaValue rhs )     { return rhs.gteq_b(v); }
+	public boolean lteq_b( LuaValue rhs )     { return rhs instanceof LuaNumber ? rhs.gteq_b(v) : super.lteq_b(rhs); }
 	public boolean lteq_b( int rhs )       { return v <= rhs; }
 	public boolean lteq_b( double rhs )    { return v <= rhs; }
-	public LuaValue   gt( LuaValue rhs )         { return rhs.lt_b(v)? LuaValue.TRUE: FALSE; }
+	public LuaValue   gt( LuaValue rhs )         { return rhs instanceof LuaNumber ? (rhs.lt_b(v)? TRUE: FALSE) : super.gt(rhs); }
 	public LuaValue   gt( double rhs )      { return v > rhs? TRUE: FALSE; }
 	public LuaValue   gt( int rhs )         { return v > rhs? TRUE: FALSE; }
-	public boolean gt_b( LuaValue rhs )       { return rhs.lt_b(v); }
+	public boolean gt_b( LuaValue rhs )       { return rhs instanceof LuaNumber ? rhs.lt_b(v) : super.gt_b(rhs); }
 	public boolean gt_b( int rhs )         { return v > rhs; }
 	public boolean gt_b( double rhs )      { return v > rhs; }
-	public LuaValue   gteq( LuaValue rhs )       { return rhs.lteq_b(v)? LuaValue.TRUE: FALSE; }
+	public LuaValue   gteq( LuaValue rhs )       { return rhs instanceof LuaNumber ? (rhs.lteq_b(v)? TRUE: FALSE) : super.gteq(rhs); }
 	public LuaValue   gteq( double rhs )    { return v >= rhs? TRUE: FALSE; }
 	public LuaValue   gteq( int rhs )       { return v >= rhs? TRUE: FALSE; }
-	public boolean gteq_b( LuaValue rhs )     { return rhs.lteq_b(v); }
+	public boolean gteq_b( LuaValue rhs )     { return rhs instanceof LuaNumber ? rhs.lteq_b(v) : super.gteq_b(rhs); }
 	public boolean gteq_b( int rhs )       { return v >= rhs; }
 	public boolean gteq_b( double rhs )    { return v >= rhs; }
 	

src/core/org/luaj/vm2/LuaFunction.java

@@ -74,10 +74,13 @@ public class LuaFunction extends LuaValue {
 
 	/** Return the last part of the class name, to be used as a function name in tojstring and elsewhere.
 	 * @return String naming the last part of the class name after the last dot (.) or dollar sign ($).
+	 * If the first character is '_', it is skipped.
 	 */
 	public String classnamestub() {
 		String s = getClass().getName();
-		return s.substring(Math.max(s.lastIndexOf('.'),s.lastIndexOf('$'))+1);
+		int offset = Math.max(s.lastIndexOf('.'), s.lastIndexOf('$')) + 1;
+		if (s.charAt(offset) == '_') offset++;
+		return s.substring(offset);
 	}
 	
 	/** Return a human-readable name for this function.  Returns the last part of the class name by default.

src/core/org/luaj/vm2/LuaInteger.java

@@ -172,28 +172,28 @@ public class LuaInteger extends LuaNumber {
 	public LuaValue   modFrom( double lhs )   { return LuaDouble.dmod(lhs,v); }
 	
 	// relational operators
-	public LuaValue   lt( LuaValue rhs )         { return rhs.gt_b(v)? TRUE: FALSE; }	
+	public LuaValue   lt( LuaValue rhs )         { return rhs instanceof LuaNumber ? (rhs.gt_b(v)? TRUE: FALSE) : super.lt(rhs); }
 	public LuaValue   lt( double rhs )      { return v < rhs? TRUE: FALSE; }
 	public LuaValue   lt( int rhs )         { return v < rhs? TRUE: FALSE; }
-	public boolean lt_b( LuaValue rhs )       { return rhs.gt_b(v); }
+	public boolean lt_b( LuaValue rhs )       { return rhs instanceof LuaNumber ? rhs.gt_b(v) : super.lt_b(rhs); }
 	public boolean lt_b( int rhs )         { return v < rhs; }
 	public boolean lt_b( double rhs )      { return v < rhs; }
-	public LuaValue   lteq( LuaValue rhs )       { return rhs.gteq_b(v)? TRUE: FALSE; }
+	public LuaValue   lteq( LuaValue rhs )       { return rhs instanceof LuaNumber ? (rhs.gteq_b(v)? TRUE: FALSE) : super.lteq(rhs); }
 	public LuaValue   lteq( double rhs )    { return v <= rhs? TRUE: FALSE; }
 	public LuaValue   lteq( int rhs )       { return v <= rhs? TRUE: FALSE; }
-	public boolean lteq_b( LuaValue rhs )     { return rhs.gteq_b(v); }
+	public boolean lteq_b( LuaValue rhs )     { return rhs instanceof LuaNumber ? rhs.gteq_b(v) : super.lteq_b(rhs); }
 	public boolean lteq_b( int rhs )       { return v <= rhs; }
 	public boolean lteq_b( double rhs )    { return v <= rhs; }
-	public LuaValue   gt( LuaValue rhs )         { return rhs.lt_b(v)? TRUE: FALSE; }
+	public LuaValue   gt( LuaValue rhs )         { return rhs instanceof LuaNumber ? (rhs.lt_b(v)? TRUE: FALSE) : super.gt(rhs); }
 	public LuaValue   gt( double rhs )      { return v > rhs? TRUE: FALSE; }
 	public LuaValue   gt( int rhs )         { return v > rhs? TRUE: FALSE; }
-	public boolean gt_b( LuaValue rhs )       { return rhs.lt_b(v); }
+	public boolean gt_b( LuaValue rhs )       { return rhs instanceof LuaNumber ? rhs.lt_b(v) : super.gt_b(rhs); }
 	public boolean gt_b( int rhs )         { return v > rhs; }
 	public boolean gt_b( double rhs )      { return v > rhs; }
-	public LuaValue   gteq( LuaValue rhs )       { return rhs.lteq_b(v)? TRUE: FALSE; }
+	public LuaValue   gteq( LuaValue rhs )       { return rhs instanceof LuaNumber ? (rhs.lteq_b(v)? TRUE: FALSE) : super.gteq(rhs); }
 	public LuaValue   gteq( double rhs )    { return v >= rhs? TRUE: FALSE; }
 	public LuaValue   gteq( int rhs )       { return v >= rhs? TRUE: FALSE; }
-	public boolean gteq_b( LuaValue rhs )     { return rhs.lteq_b(v); }
+	public boolean gteq_b( LuaValue rhs )     { return rhs instanceof LuaNumber ? rhs.lteq_b(v) : super.gteq_b(rhs); }
 	public boolean gteq_b( int rhs )       { return v >= rhs; }
 	public boolean gteq_b( double rhs )    { return v >= rhs; }
 	

src/core/org/luaj/vm2/LuaString.java

@@ -289,20 +289,20 @@ public class LuaString extends LuaValue {
 	public LuaValue   modFrom( double lhs )    { return LuaDouble.dmod(lhs, checkarith()); }
 	
 	// relational operators, these only work with other strings
-	public LuaValue   lt( LuaValue rhs )         { return rhs.strcmp(this)>0? LuaValue.TRUE: FALSE; }
+	public LuaValue   lt( LuaValue rhs )         { return rhs.isstring() ? (rhs.strcmp(this)>0? LuaValue.TRUE: FALSE) : super.lt(rhs); }
-	public boolean lt_b( LuaValue rhs )       { return rhs.strcmp(this)>0; }
+	public boolean lt_b( LuaValue rhs )       { return rhs.isstring() ? rhs.strcmp(this)>0 : super.lt_b(rhs); }
 	public boolean lt_b( int rhs )         { typerror("attempt to compare string with number"); return false; }
 	public boolean lt_b( double rhs )      { typerror("attempt to compare string with number"); return false; }
-	public LuaValue   lteq( LuaValue rhs )       { return rhs.strcmp(this)>=0? LuaValue.TRUE: FALSE; }
+	public LuaValue   lteq( LuaValue rhs )       { return rhs.isstring() ? (rhs.strcmp(this)>=0? LuaValue.TRUE: FALSE) : super.lteq(rhs); }
-	public boolean lteq_b( LuaValue rhs )     { return rhs.strcmp(this)>=0; }
+	public boolean lteq_b( LuaValue rhs )     { return rhs.isstring() ? rhs.strcmp(this)>=0 : super.lteq_b(rhs); }
 	public boolean lteq_b( int rhs )       { typerror("attempt to compare string with number"); return false; }
 	public boolean lteq_b( double rhs )    { typerror("attempt to compare string with number"); return false; }
-	public LuaValue   gt( LuaValue rhs )         { return rhs.strcmp(this)<0? LuaValue.TRUE: FALSE; }
+	public LuaValue   gt( LuaValue rhs )         { return rhs.isstring() ? (rhs.strcmp(this)<0? LuaValue.TRUE: FALSE) : super.gt(rhs); }
-	public boolean gt_b( LuaValue rhs )       { return rhs.strcmp(this)<0; }
+	public boolean gt_b( LuaValue rhs )       { return rhs.isstring() ? rhs.strcmp(this)<0 : super.gt_b(rhs); }
 	public boolean gt_b( int rhs )         { typerror("attempt to compare string with number"); return false; }
 	public boolean gt_b( double rhs )      { typerror("attempt to compare string with number"); return false; }
-	public LuaValue   gteq( LuaValue rhs )       { return rhs.strcmp(this)<=0? LuaValue.TRUE: FALSE; }
+	public LuaValue   gteq( LuaValue rhs )       { return rhs.isstring() ? (rhs.strcmp(this)<=0? LuaValue.TRUE: FALSE) : super.gteq(rhs); }
-	public boolean gteq_b( LuaValue rhs )     { return rhs.strcmp(this)<=0; }
+	public boolean gteq_b( LuaValue rhs )     { return rhs.isstring() ? rhs.strcmp(this)<=0 : super.gteq_b(rhs); }
 	public boolean gteq_b( int rhs )       { typerror("attempt to compare string with number"); return false; }
 	public boolean gteq_b( double rhs )    { typerror("attempt to compare string with number"); return false; }
 

src/core/org/luaj/vm2/LuaTable.java

@@ -299,15 +299,15 @@ public class LuaTable extends LuaValue implements Metatable {
 	 * @return The removed item, or {@link #NONE} if not removed
 	 */
 	public LuaValue remove(int pos) {
-		int n = rawlen();
+		int n = length();
 		if ( pos == 0 )
 			pos = n;
 		else if (pos > n)
 			return NONE;
-		LuaValue v = rawget(pos);
+		LuaValue v = get(pos);
 		for ( LuaValue r=v; !r.isnil(); ) {
-			r = rawget(pos+1);
+			r = get(pos+1);
-			rawset(pos++, r);
+			set(pos++, r);
 		}
 		return v.isnil()? NONE: v;
 	}
@@ -319,10 +319,10 @@ public class LuaTable extends LuaValue implements Metatable {
 	 */
 	public void insert(int pos, LuaValue value) {
 		if ( pos == 0 )
-			pos = rawlen()+1;
+			pos = length()+1;
 		while ( ! value.isnil() ) {
-			LuaValue v = rawget( pos );
+			LuaValue v = get( pos );
-			rawset(pos++, value);
+			set(pos++, value);
 			value = v;
 		}
 	}
@@ -472,7 +472,8 @@ public class LuaTable extends LuaValue implements Metatable {
 				}
 			}
 			if ( checkLoadFactor() ) {
-				if ( key.isinttype() && key.toint() > 0 ) {
+				if ( (m_metatable == null || !m_metatable.useWeakValues())
+					&& key.isinttype() && key.toint() > 0 ) {
 					// a rehash might make room in the array portion for this key.
 					rehash( key.toint() );
 					if ( arrayset(key.toint(), value) )
@@ -719,7 +720,7 @@ public class LuaTable extends LuaValue implements Metatable {
 					StrongSlot entry = slot.first();
 					if (entry != null)
 						newArray[ k - 1 ] = entry.value();
-				} else {
+				} else if ( !(slot instanceof DeadSlot) ) {
 					int j = slot.keyindex( newHashMask );
 					newHash[j] = slot.relink( newHash[j] );
 				}
@@ -789,33 +790,35 @@ public class LuaTable extends LuaValue implements Metatable {
 		if (m_metatable != null && m_metatable.useWeakValues()) {
 			dropWeakArrayValues();
 		}
-		int n = array.length;
+		int n = length();
-		while ( n > 0 && array[n-1] == null )
-			--n;
 		if ( n > 1 )
-			heapSort(n, comparator);
+			heapSort(n, comparator.isnil() ? null : comparator);
 	}
 
 	private void heapSort(int count, LuaValue cmpfunc) {
 		heapify(count, cmpfunc);
-		for ( int end=count-1; end>0; ) {
+		for ( int end=count; end>1; ) {
-			swap(end, 0);
+			LuaValue a = get(end); // swap(end, 1)
-			siftDown(0, --end, cmpfunc);
+			set(end, get(1));
+			set(1, a);
+			siftDown(1, --end, cmpfunc);
 		}
 	}
 
 	private void heapify(int count, LuaValue cmpfunc) {
-		for ( int start=count/2-1; start>=0; --start )
+		for ( int start=count/2; start>0; --start )
-			siftDown(start, count - 1, cmpfunc);
+			siftDown(start, count, cmpfunc);
 	}
 
 	private void siftDown(int start, int end, LuaValue cmpfunc) {
-		for ( int root=start; root*2+1 <= end; ) { 
+		for ( int root=start; root*2 <= end; ) {
-			int child = root*2+1; 
+			int child = root*2;
 			if (child < end && compare(child, child + 1, cmpfunc))
 				++child;
 			if (compare(root, child, cmpfunc)) {
-				swap(root, child);
+				LuaValue a = get(root); // swap(root, child)
+				set(root, get(child));
+				set(child, a);
 				root = child;
 			} else
 				return;
@@ -823,29 +826,16 @@ public class LuaTable extends LuaValue implements Metatable {
 	}
 
 	private boolean compare(int i, int j, LuaValue cmpfunc) {
-		LuaValue a, b;
+		LuaValue a = get(i), b = get(j);
-		if (m_metatable == null) {
-			a = array[i];
-			b = array[j];
-		} else {
-			a = m_metatable.arrayget(array, i);
-			b = m_metatable.arrayget(array, j);
-		}
 		if ( a == null || b == null )
 			return false;
-		if ( ! cmpfunc.isnil() ) {
+		if ( cmpfunc != null ) {
 			return cmpfunc.call(a,b).toboolean();
 		} else {
 			return a.lt_b(b);
 		}
 	}
 	
-	private void swap(int i, int j) {
-		LuaValue a = array[i];
-		array[i] = array[j];
-		array[j] = a;
-	}
-	
 	/** This may be deprecated in a future release.
 	 * It is recommended to count via iteration over next() instead
 	 * @return count of keys in the table

src/core/org/luaj/vm2/LuaValue.java

@@ -21,8 +21,6 @@
 ******************************************************************************/
 package org.luaj.vm2;
 
-import org.luaj.vm2.Varargs;
-
 /**
  * Base class for all concrete lua type values.
  * <p>
@@ -3362,7 +3360,7 @@ public class LuaValue extends Varargs {
 	protected LuaValue checkmetatag(LuaValue tag, String reason) {
 		LuaValue h = this.metatag(tag);
 		if ( h.isnil() )
-			throw new LuaError(reason+typename());
+			throw new LuaError(reason + "a " + typename() + " value");
 		return h;
 	}
 

src/core/org/luaj/vm2/Varargs.java

@@ -291,7 +291,7 @@ public abstract class Varargs {
 	 * @return java double value if argument i is a number or string that converts to a number
 	 * @exception LuaError if the argument is not a number
 	 * */
-	public double       checkdouble(int i)           { return arg(i).checknumber().todouble(); }
+	public double       checkdouble(int i)           { return arg(i).checkdouble(); }
 
 	/** Return argument i as a function, or throw an error if an incompatible type.
 	 * @param i the index of the argument to test, 1 is the first argument
@@ -300,12 +300,12 @@ public abstract class Varargs {
 	 * */
 	public LuaFunction    checkfunction(int i)         { return arg(i).checkfunction(); }
 
-	/** Return argument i as a java int value, discarding any fractional part, or throw an error if not a number.
+	/** Return argument i as a java int value, or throw an error if it cannot be converted to one.
 	 * @param i the index of the argument to test, 1 is the first argument
-	 * @return int value with fraction discarded and truncated if necessary if argument i is number
+	 * @return int value if argument i is a number or string that converts to a number
-	 * @exception LuaError if the argument is not a number
+	 * @exception LuaError if the argument cannot be represented by a java int value
 	 * */
-	public int          checkint(int i)              { return arg(i).checknumber().toint(); }
+	public int          checkint(int i)              { return arg(i).checkint(); }
 
 	/** Return argument i as a java int value, or throw an error if not a number or is not representable by a java int.
 	 * @param i the index of the argument to test, 1 is the first argument
@@ -314,12 +314,12 @@ public abstract class Varargs {
 	 * */
 	public LuaInteger   checkinteger(int i)          { return arg(i).checkinteger(); }
 
-	/** Return argument i as a java long value, discarding any fractional part, or throw an error if not a number.
+	/** Return argument i as a java long value, or throw an error if it cannot be converted to one.
 	 * @param i the index of the argument to test, 1 is the first argument
-	 * @return long value with fraction discarded and truncated if necessary if argument i is number
+	 * @return long value if argument i is a number or string that converts to a number
-	 * @exception LuaError if the argument is not a number
+	 * @exception LuaError if the argument cannot be represented by a java long value
 	 * */
-	public long         checklong(int i)             { return arg(i).checknumber().tolong(); }
+	public long         checklong(int i)             { return arg(i).checklong(); }
 
 	/** Return argument i as a LuaNumber, or throw an error if not a number or string that can be converted to a number.
 	 * @param i the index of the argument to test, 1 is the first argument
@@ -707,8 +707,10 @@ public abstract class Varargs {
 	/** Return Varargs that cannot be using a shared array for the storage, and is flattened.
 	 * Internal utility method not intended to be called directly from user code.
 	 * @return Varargs containing same values, but flattened and with a new array if needed.
+	 * @exclude
+	 * @hide
 	 */
-	Varargs dealias() {
+	public Varargs dealias() {
 		int n = narg();
 		switch (n) {
 		case 0: return LuaValue.NONE;

src/core/org/luaj/vm2/compiler/Constants.java

@@ -105,6 +105,11 @@ public class Constants extends Lua {
 				((bc << POS_Bx) & MASK_Bx) ;
  	}
 	
+	static int CREATE_Ax(int o, int a) {
+		return ((o << POS_OP) & MASK_OP) |
+				((a << POS_Ax) & MASK_Ax) ;
+ 	}
+
 	// vector reallocation
 	
 	static LuaValue[] realloc(LuaValue[] v, int n) {

src/core/org/luaj/vm2/compiler/DumpState.java

@@ -28,9 +28,9 @@ import java.io.OutputStream;
 import org.luaj.vm2.Globals;
 import org.luaj.vm2.LoadState;
 import org.luaj.vm2.LocVars;
-import org.luaj.vm2.Prototype;
 import org.luaj.vm2.LuaString;
 import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.Prototype;
 
 
 /** Class to dump a {@link Prototype} into an output stream, as part of compiling.
@@ -85,7 +85,7 @@ public class DumpState {
 	public static final int NUMBER_FORMAT_DEFAULT = NUMBER_FORMAT_FLOATS_OR_DOUBLES;
 
 	// header fields
-	private boolean IS_LITTLE_ENDIAN = false;
+	private boolean IS_LITTLE_ENDIAN = true;
 	private int NUMBER_FORMAT = NUMBER_FORMAT_DEFAULT;
 	private int SIZEOF_LUA_NUMBER = 8;
 	private static final int SIZEOF_INT = 4;

src/core/org/luaj/vm2/compiler/FuncState.java

@@ -50,7 +50,6 @@ public class FuncState extends Constants {
 	Hashtable h;  /* table to find (and reuse) elements in `k' */
 	FuncState prev;  /* enclosing function */
 	LexState ls;  /* lexical state */
-	LuaC.CompileState L;  /* compiler being invoked */
 	BlockCnt bl;  /* chain of current blocks */
 	int pc;  /* next position to code (equivalent to `ncode') */
 	int lasttarget;   /* `pc' of last `jump target' */
@@ -113,8 +112,8 @@ public class FuncState extends Constants {
 	void errorlimit (int limit, String what) {
 		// TODO: report message logic.
 	  	String msg = (f.linedefined == 0) ?
-	  	    L.pushfstring("main function has more than "+limit+" "+what) :
+	  	    ls.L.pushfstring("main function has more than "+limit+" "+what) :
-	  	    L.pushfstring("function at line "+f.linedefined+" has more than "+limit+" "+what);
+	  	    ls.L.pushfstring("function at line "+f.linedefined+" has more than "+limit+" "+what);
 	  	  ls.lexerror(msg, 0);
 	}
 
@@ -581,11 +580,11 @@ public class FuncState extends Constants {
 			break;
 		}
 		case LexState.VK: {
-			this.codeABx(OP_LOADK, reg, e.u.info);
+			this.codeK(reg, e.u.info);
 			break;
 		}
 		case LexState.VKNUM: {
-			this.codeABx(OP_LOADK, reg, this.numberK(e.u.nval()));
+			this.codeK(reg, this.numberK(e.u.nval()));
 			break;
 		}
 		case LexState.VRELOCABLE: {
@@ -1117,6 +1116,20 @@ public class FuncState extends Constants {
 		return this.code(CREATE_ABx(o, a, bc), this.ls.lastline);
 	}
 
+	int codeextraarg(int a) {
+		_assert(a <= MAXARG_Ax);
+		return this.code(CREATE_Ax(OP_EXTRAARG, a), this.ls.lastline);
+	}
+
+	int codeK(int reg, int k) {
+		if (k <= MAXARG_Bx)
+			return codeABx(OP_LOADK, reg, k);
+		else {
+			int p = codeABx(OP_LOADKX, reg, 0);
+			codeextraarg(k);
+			return p;
+		}
+	}
 
 	void setlist(int base, int nelems, int tostore) {
 		int c = (nelems - 1) / LFIELDS_PER_FLUSH + 1;

src/core/org/luaj/vm2/compiler/LexState.java

@@ -198,7 +198,7 @@ public class LexState extends Constants {
 	}
 	
 	private boolean isspace(int c) {
-		return (c <= ' ');
+		return (c >= 0 && c <= ' ');
 	}
 	
 	
@@ -388,8 +388,13 @@ public class LexState extends Constants {
 			seminfo.r = LuaValue.ZERO;
 		else if (str.indexOf('x')>=0 || str.indexOf('X')>=0)
 			seminfo.r = strx2number(str, seminfo);
-		else
+		else {
+			try {
 				seminfo.r = LuaValue.valueOf(Double.parseDouble(str.trim()));
+			} catch (NumberFormatException e) {
+				lexerror("malformed number (" + e.getMessage() + ")", TK_NUMBER);
+			}
+		}
 		return true;
 	}
 
@@ -408,7 +413,6 @@ public class LexState extends Constants {
 			else
 				break;
 		}
-		save('\0');
 		String str = new String(buff, 0, nbuff);
 		str2d(str, seminfo);
 	}
@@ -585,6 +589,13 @@ public class LexState extends Constants {
 				inclinenumber();
 				continue;
 			}
+			case ' ':
+			case '\f':
+			case '\t':
+			case 0x0B: /* \v */ {
+				nextChar();
+				continue;
+			}
 			case '-': {
 				nextChar();
 				if (current != '-')
@@ -688,19 +699,12 @@ public class LexState extends Constants {
 				return TK_EOS;
 			}
 			default: {
-				if (isspace(current)) {
+				if (isalpha(current) || current == '_') {
-					_assert (!currIsNewline());
-					nextChar();
-					continue;
-				} else if (isdigit(current)) {
-					read_numeral(seminfo);
-					return TK_NUMBER;
-				} else if (isalpha(current) || current == '_') {
 					/* identifier or reserved word */
 					LuaString ts;
 					do {
 						save_and_next();
-					} while (isalnum(current) || current == '_');
+					} while (isalnum(current));
 					ts = newstring(buff, 0, nbuff);
 					if ( RESERVED.containsKey(ts) )
 						return ((Integer)RESERVED.get(ts)).intValue();
@@ -1744,7 +1748,7 @@ public class LexState extends Constants {
 		fs.checkrepeated(dyd.label, dyd.n_label, label);  /* check for repeated labels */
 		checknext(TK_DBCOLON);  /* skip double colon */
 		/* create new entry for this label */
-		l = newlabelentry(dyd.label=grow(dyd.label, dyd.n_label+1), dyd.n_label++, label, line, fs.pc);
+		l = newlabelentry(dyd.label=grow(dyd.label, dyd.n_label+1), dyd.n_label++, label, line, fs.getlabel());
 		skipnoopstat();  /* skip other no-op statements */
 		if (block_follow(false)) {  /* label is last no-op statement in the block? */
 			/* assume that locals are already out of scope */
@@ -1845,7 +1849,7 @@ public class LexState extends Constants {
 		if (this.testnext(','))
 			this.exp1(); /* optional step */
 		else { /* default step = 1 */
-			fs.codeABx(Lua.OP_LOADK, fs.freereg, fs.numberK(LuaInteger.valueOf(1)));
+			fs.codeK(fs.freereg, fs.numberK(LuaInteger.valueOf(1)));
 			fs.reserveregs(1);
 		}
 		this.forbody(base, line, 1, true);

src/core/org/luaj/vm2/lib/BaseLib.java

@@ -152,7 +152,7 @@ public class BaseLib extends TwoArgFunction implements ResourceFinder {
 				System.gc();
 				return LuaValue.TRUE;
 			} else {
-				this.argerror("gc op");
+				argerror(1, "invalid option '" + s + "'");
 			}
 			return NIL;
 		}
@@ -173,16 +173,16 @@ public class BaseLib extends TwoArgFunction implements ResourceFinder {
 	// "error", // ( message [,level] ) -> ERR
 	static final class error extends TwoArgFunction {
 		public LuaValue call(LuaValue arg1, LuaValue arg2) {
-			throw arg1.isnil()? new LuaError(null, arg2.optint(1)): 
+			if (arg1.isnil()) throw new LuaError(NIL);
-				arg1.isstring()? new LuaError(arg1.tojstring(), arg2.optint(1)): 
+			if (!arg1.isstring() || arg2.optint(1) == 0) throw new LuaError(arg1);
-					new LuaError(arg1);
+			throw new LuaError(arg1.tojstring(), arg2.optint(1));
 		}
 	}
 
 	// "getmetatable", // ( object ) -> table
 	static final class getmetatable extends LibFunction {
 		public LuaValue call() {
-			return argerror(1, "value");
+			return argerror(1, "value expected");
 		}
 		public LuaValue call(LuaValue arg) {
 			LuaValue mt = arg.getmetatable();
@@ -193,7 +193,9 @@ public class BaseLib extends TwoArgFunction implements ResourceFinder {
 	final class load extends VarArgFunction {
 		public Varargs invoke(Varargs args) {
 			LuaValue ld = args.arg1();
-			args.argcheck(ld.isstring() || ld.isfunction(), 1, "ld must be string or function");
+			if (!ld.isstring() && !ld.isfunction()) {
+				throw new LuaError("bad argument #1 to 'load' (string or function expected, got " + ld.typename() + ")");
+			}
 			String source = args.optjstring(2, ld.isstring()? ld.tojstring(): "=(load)");
 			String mode = args.optjstring(3, "bt");
 			LuaValue env = args.optvalue(4, globals);
@@ -245,11 +247,11 @@ public class BaseLib extends TwoArgFunction implements ResourceFinder {
 		public Varargs invoke(Varargs args) {
 			LuaValue tostring = globals.get("tostring");
 			for ( int i=1, n=args.narg(); i<=n; i++ ) {
-				if ( i>1 ) globals.STDOUT.print( " \t" );
+				if ( i>1 ) globals.STDOUT.print( '\t' );
 				LuaString s = tostring.call( args.arg(i) ).strvalue();
 				globals.STDOUT.print(s.tojstring());
 			}
-			globals.STDOUT.println();
+			globals.STDOUT.print('\n');
 			return NONE;
 		}
 	}
@@ -258,10 +260,10 @@ public class BaseLib extends TwoArgFunction implements ResourceFinder {
 	// "rawequal", // (v1, v2) -> boolean
 	static final class rawequal extends LibFunction {
 		public LuaValue call() {
-			return argerror(1, "value");
+			return argerror(1, "value expected");
 		}
 		public LuaValue call(LuaValue arg) {
-			return argerror(2, "value");
+			return argerror(2, "value expected");
 		}
 		public LuaValue call(LuaValue arg1, LuaValue arg2) {
 			return valueOf(arg1.raweq(arg2));
@@ -269,12 +271,9 @@ public class BaseLib extends TwoArgFunction implements ResourceFinder {
 	}
 
 	// "rawget", // (table, index) -> value
-	static final class rawget extends LibFunction {
+	static final class rawget extends TableLibFunction {
-		public LuaValue call() {
-			return argerror(1, "value");
-		}
 		public LuaValue call(LuaValue arg) {
-			return argerror(2, "value");
+			return argerror(2, "value expected");
 		}
 		public LuaValue call(LuaValue arg1, LuaValue arg2) {
 			return arg1.checktable().rawget(arg2);
@@ -290,16 +289,16 @@ public class BaseLib extends TwoArgFunction implements ResourceFinder {
 	}
 
 	// "rawset", // (table, index, value) -> table
-	static final class rawset extends LibFunction {
+	static final class rawset extends TableLibFunction {
 		public LuaValue call(LuaValue table) {
-			return argerror(2,"value");
+			return argerror(2,"value expected");
 		}
 		public LuaValue call(LuaValue table, LuaValue index) {
-			return argerror(3,"value");
+			return argerror(3,"value expected");
 		}
 		public LuaValue call(LuaValue table, LuaValue index, LuaValue value) {
 			LuaTable t = table.checktable();
-			if (!index.isvalidkey()) argerror(2, "value");
+			if (!index.isvalidkey()) argerror(2, "table index is nil");
 			t.rawset(index, value);
 			return t;
 		}
@@ -319,9 +318,9 @@ public class BaseLib extends TwoArgFunction implements ResourceFinder {
 	}
 	
 	// "setmetatable", // (table, metatable) -> table
-	static final class setmetatable extends LibFunction {
+	static final class setmetatable extends TableLibFunction {
 		public LuaValue call(LuaValue table) {
-			return argerror(2,"value");
+			return argerror(2,"nil or table expected");
 		}
 		public LuaValue call(LuaValue table, LuaValue metatable) {
 			final LuaValue mt0 = table.checktable().getmetatable();
@@ -466,10 +465,12 @@ public class BaseLib extends TwoArgFunction implements ResourceFinder {
 			this.func = func;
 		}
 		public int read() throws IOException {
-			if ( remaining <= 0 ) {
+			if ( remaining < 0 )
+				return -1;
+			if ( remaining == 0 ) {
 				LuaValue s = func.call();
 				if ( s.isnil() )
-					return -1;
+					return remaining = -1;
 				LuaString ls = s.strvalue();
 				bytes = ls.m_bytes;
 				offset = ls.m_offset;
@@ -478,7 +479,7 @@ public class BaseLib extends TwoArgFunction implements ResourceFinder {
 					return -1;
 			}
 			--remaining;
-			return bytes[offset++];
+			return 0xFF&bytes[offset++];
 		}
 	}
 }

src/core/org/luaj/vm2/lib/DebugLib.java

@@ -442,6 +442,10 @@ public class DebugLib extends TwoArgFunction {
 		return callstack().traceback(level);
 	}
 	
+	public CallFrame getCallFrame(int level) {
+		return callstack().getCallFrame(level);
+	}
+	
 	void callHook(LuaThread.State s, LuaValue type, LuaValue arg) {
 		if (s.inhook || s.hookfunc == null) return;
 		s.inhook = true;
@@ -645,7 +649,7 @@ public class DebugLib extends TwoArgFunction {
 
 	}
 
-	static class CallFrame {
+	public static class CallFrame {
 		LuaFunction f;
 		int pc;
 		int top;
@@ -691,7 +695,7 @@ public class DebugLib extends TwoArgFunction {
 				return NIL;
 			}
 		}
-		int currentline() {
+		public int currentline() {
 			if ( !f.isclosure() ) return -1;
 			int[] li = f.checkclosure().p.lineinfo;
 			return li==null || pc<0 || pc>=li.length? -1: li[pc];
@@ -796,13 +800,13 @@ public class DebugLib extends TwoArgFunction {
 		        LuaString vn = (Lua.GET_OPCODE(i) == Lua.OP_GETTABLE)  /* name of indexed variable */
 	                    ? p.getlocalname(t + 1, pc)
 	                    : (t < p.upvalues.length ? p.upvalues[t].name : QMARK);
-				name = kname(p, k);
+				String jname = kname(p, pc, k);
-				return new NameWhat( name.tojstring(), vn != null && vn.eq_b(ENV)? "global": "field" );
+				return new NameWhat( jname, vn != null && vn.eq_b(ENV)? "global": "field" );
 			}
 			case Lua.OP_GETUPVAL: {
 				int u = Lua.GETARG_B(i); /* upvalue index */
 				name = u < p.upvalues.length ? p.upvalues[u].name : QMARK;
-				return new NameWhat( name.tojstring(), "upvalue" );
+				return name == null ? null : new NameWhat( name.tojstring(), "upvalue" );
 			}
 		    case Lua.OP_LOADK:
 		    case Lua.OP_LOADKX: {
@@ -816,8 +820,8 @@ public class DebugLib extends TwoArgFunction {
 		    }
 			case Lua.OP_SELF: {
 				int k = Lua.GETARG_C(i); /* key index */
-				name = kname(p, k);
+				String jname = kname(p, pc, k);
-				return new NameWhat( name.tojstring(), "method" );
+				return new NameWhat( jname, "method" );
 			}
 			default:
 				break;
@@ -826,11 +830,20 @@ public class DebugLib extends TwoArgFunction {
 		return null; /* no useful name found */
 	}
 
-	static LuaString kname(Prototype p, int c) {
+	static String kname(Prototype p, int pc, int c) {
-		if (Lua.ISK(c) && p.k[Lua.INDEXK(c)].isstring())
+		if (Lua.ISK(c)) {  /* is 'c' a constant? */
-			return p.k[Lua.INDEXK(c)].strvalue();
+			LuaValue k = p.k[Lua.INDEXK(c)];
-		else
+			if (k.isstring()) {  /* literal constant? */
-			return QMARK;
+				return k.tojstring();  /* it is its own name */
+			} /* else no reasonable name found */
+		} else {  /* 'c' is a register */
+			NameWhat what = getobjname(p, pc, c); /* search for 'c' */
+		    if (what != null && "constant".equals(what.namewhat)) {  /* found a constant name? */
+		      return what.name;  /* 'name' already filled */
+		    }
+		    /* else no reasonable name found */
+		}
+		return "?";  /* no reasonable name found */
 	}
 
 	/*

src/core/org/luaj/vm2/lib/IoLib.java

@@ -95,6 +95,12 @@ public class IoLib extends TwoArgFunction {
 		// return number of bytes read if positive, false if eof, throw IOException on other exception
 		abstract public int read(byte[] bytes, int offset, int length) throws IOException;
 		
+		public boolean eof() throws IOException {
+			try {
+				return peek() < 0;
+			} catch (EOFException e) { return true; }
+		}
+		
 		// delegate method access to file methods table
 		public LuaValue get( LuaValue key ) {
 			return filemethods.get(key);
@@ -112,6 +118,14 @@ public class IoLib extends TwoArgFunction {
 		public String tojstring() {
 			return "file: " + Integer.toHexString(hashCode());
 		}
+		
+		public void finalize() {
+			if (!isclosed()) {
+				try {
+					close();
+				} catch (IOException ignore) {}
+			}
+		}
 	}
 
 	/** Enumerated value representing stdin */
@@ -269,8 +283,15 @@ public class IoLib extends TwoArgFunction {
 	static final class IoLibV extends VarArgFunction {
 		private File f;
 		public IoLib iolib;
+		private boolean toclose;
+		private Varargs args;
 		public IoLibV() {
 		}
+		public IoLibV(File f, String name, int opcode, IoLib iolib, boolean toclose, Varargs args) {
+			this(f, name, opcode, iolib);
+			this.toclose = toclose;
+			this.args = args.dealias();
+		}
 		public IoLibV(File f, String name, int opcode, IoLib iolib) {
 			super();
 			this.f = f;
@@ -290,22 +311,26 @@ public class IoLib extends TwoArgFunction {
 				case IO_TYPE:		return iolib._io_type(args.arg1());
 				case IO_POPEN:		return iolib._io_popen(args.checkjstring(1),args.optjstring(2,"r"));
 				case IO_OPEN:		return iolib._io_open(args.checkjstring(1), args.optjstring(2,"r"));
-				case IO_LINES:		return iolib._io_lines(args.isvalue(1)? args.checkjstring(1): null);
+				case IO_LINES:		return iolib._io_lines(args);
 				case IO_READ:		return iolib._io_read(args);
 				case IO_WRITE:		return iolib._io_write(args);
 					
 				case FILE_CLOSE:	return iolib._file_close(args.arg1());
 				case FILE_FLUSH:	return iolib._file_flush(args.arg1());
-				case FILE_SETVBUF:	return iolib._file_setvbuf(args.arg1(),args.checkjstring(2),args.optint(3,1024));
+				case FILE_SETVBUF:	return iolib._file_setvbuf(args.arg1(),args.checkjstring(2),args.optint(3,8192));
-				case FILE_LINES:	return iolib._file_lines(args.arg1());
+				case FILE_LINES:	return iolib._file_lines(args);
 				case FILE_READ:		return iolib._file_read(args.arg1(),args.subargs(2));
 				case FILE_SEEK:		return iolib._file_seek(args.arg1(),args.optjstring(2,"cur"),args.optint(3,0));
 				case FILE_WRITE:	return iolib._file_write(args.arg1(),args.subargs(2));
 
 				case IO_INDEX:		return iolib._io_index(args.arg(2));
-				case LINES_ITER:	return iolib._lines_iter(f);
+				case LINES_ITER:	return iolib._lines_iter(f, toclose, this.args);
 				}
 			} catch ( IOException ioe ) {
+				if (opcode == LINES_ITER) {
+					String s = ioe.getMessage();
+					error(s != null ? s : ioe.toString());
+				}
 				return errorresult(ioe);
 			}
 			return NONE;
@@ -361,6 +386,7 @@ public class IoLib extends TwoArgFunction {
 
 	// io.popen(prog, [mode]) -> file
 	public Varargs _io_popen(String prog, String mode) throws IOException {
+		if (!"r".equals(mode) && !"w".equals(mode)) argerror(2, "invalid value: '" + mode + "'; must be one of 'r' or 'w'");
 		return openProgram(prog, mode);
 	}
 
@@ -369,11 +395,12 @@ public class IoLib extends TwoArgFunction {
 		return rawopenfile(FTYPE_NAMED, filename, mode);
 	}
 
-	//	io.lines(filename) -> iterator
+	//	io.lines(filename, ...) -> iterator
-	public Varargs _io_lines(String filename) {
+	public Varargs _io_lines(Varargs args) {
-		infile = filename==null? input(): ioopenfile(FTYPE_NAMED, filename,"r");
+		String filename = args.optjstring(1, null);
+		File infile = filename==null? input(): ioopenfile(FTYPE_NAMED, filename,"r");
 		checkopen(infile);
-		return lines(infile);
+		return lines(infile, filename != null, args.subargs(2));
 	}
 
 	//	io.read(...) -> (...)
@@ -401,13 +428,19 @@ public class IoLib extends TwoArgFunction {
 
 	// file:setvbuf(mode,[size]) -> void
 	public Varargs _file_setvbuf(LuaValue file, String mode, int size) {
+		if ("no".equals(mode)) {
+		} else if ("full".equals(mode)) {
+		} else if ("line".equals(mode)) {
+		} else {
+			argerror(1, "invalid value: '" + mode + "'; must be one of 'no', 'full' or 'line'");
+		}
 		checkfile(file).setvbuf(mode,size);
 		return LuaValue.TRUE;
 	}
 
-	// file:lines() -> iterator
+	// file:lines(...) -> iterator
-	public Varargs _file_lines(LuaValue file) {
+	public Varargs _file_lines(Varargs args) {
-		return lines(checkfile(file));
+		return lines(checkfile(args.arg1()), false, args.subargs(2));
 	}
 
 	//	file:read(...) -> (...)
@@ -417,6 +450,12 @@ public class IoLib extends TwoArgFunction {
 
 	//  file:seek([whence][,offset]) -> pos | nil,error
 	public Varargs _file_seek(LuaValue file, String whence, int offset) throws IOException {
+		if ("set".equals(whence)) {
+		} else if ("end".equals(whence)) {
+		} else if ("cur".equals(whence)) {
+		} else {
+			argerror(1, "invalid value: '" + whence + "'; must be one of 'set', 'cur' or 'end'");
+		}
 		return valueOf( checkfile(file).seek(whence,offset) );
 	}
 
@@ -433,8 +472,13 @@ public class IoLib extends TwoArgFunction {
 	}
 
 	//	lines iterator(s,var) -> var'
-	public Varargs _lines_iter(LuaValue file) throws IOException {
+	public Varargs _lines_iter(LuaValue file, boolean toclose, Varargs args) throws IOException {
-		return freadline(checkfile(file));
+		File f = optfile(file);
+		if ( f == null ) argerror(1, "not a file: " + file);
+		if ( f.isclosed() )	error("file is already closed");
+		Varargs ret = ioread(f, args);
+		if (toclose && ret.isnil(1) && f.eof()) f.close();
+		return ret;
 	}
 
 	private File output() {
@@ -476,9 +520,9 @@ public class IoLib extends TwoArgFunction {
 		return varargsOf(NIL, valueOf(errortext));
 	}
 
-	private Varargs lines(final File f) {
+	private Varargs lines(final File f, boolean toclose, Varargs args) {
 		try {
-			return new IoLibV(f,"lnext",LINES_ITER,this);
+			return new IoLibV(f,"lnext",LINES_ITER,this,toclose,args);
 		} catch ( Exception e ) {
 			return error("lines: "+e);
 		}
@@ -492,6 +536,7 @@ public class IoLib extends TwoArgFunction {
 
 	private Varargs ioread(File f, Varargs args) throws IOException {
 		int i,n=args.narg();
+		if (n == 0) return freadline(f,false);
 		LuaValue[] v = new LuaValue[n];
 		LuaValue ai,vi;
 		LuaString fmt;
@@ -502,10 +547,11 @@ public class IoLib extends TwoArgFunction {
 					break item;
 				case LuaValue.TSTRING:
 					fmt = ai.checkstring();
-					if ( fmt.m_length == 2 && fmt.m_bytes[fmt.m_offset] == '*' ) {
+					if ( fmt.m_length >= 2 && fmt.m_bytes[fmt.m_offset] == '*' ) {
 						switch ( fmt.m_bytes[fmt.m_offset+1] ) {
 						case 'n': vi = freadnumber(f); break item;
-						case 'l': vi = freadline(f); break item;
+						case 'l': vi = freadline(f,false); break item;
+						case 'L': vi = freadline(f,true); break item;
 						case 'a': vi = freadall(f); break item;
 						}
 					}
@@ -537,6 +583,17 @@ public class IoLib extends TwoArgFunction {
 	}
 
 	private File rawopenfile(int filetype, String filename, String mode) throws IOException {
+		int len = mode.length();
+		for (int i = 0; i < len; i++) { // [rwa][+]?b*
+			char ch = mode.charAt(i);
+			if (i == 0 && "rwa".indexOf(ch) >= 0) continue;
+			if (i == 1 && ch == '+') continue;
+			if (i >= 1 && ch == 'b') continue;
+			len = -1;
+			break;
+		}
+		if (len <= 0) argerror(2, "invalid mode: '" + mode + "'");
+		
 		switch (filetype) {
 		case FTYPE_STDIN: return wrapStdin();
 		case FTYPE_STDOUT: return wrapStdout();
@@ -553,26 +610,27 @@ public class IoLib extends TwoArgFunction {
 	// ------------- file reading utilitied ------------------
 	
 	public static LuaValue freadbytes(File f, int count) throws IOException {
+		if (count == 0) return f.eof() ? NIL : EMPTYSTRING;
 		byte[] b = new byte[count];
 		int r;
 		if ( ( r = f.read(b,0,b.length) ) < 0 )
 			return NIL;
 		return LuaString.valueUsing(b, 0, r);
 	}
-	public static LuaValue freaduntil(File f,boolean lineonly) throws IOException {
+	public static LuaValue freaduntil(File f,boolean lineonly,boolean withend) throws IOException {
 		ByteArrayOutputStream baos = new ByteArrayOutputStream();
 		int c;
 		try {
 			if ( lineonly ) {
-				loop: while ( (c = f.read()) > 0 ) {
+				loop: while ( (c = f.read()) >= 0 ) {
 					switch ( c ) {
-					case '\r': break;
+					case '\r': if (withend) baos.write(c); break;
-					case '\n': break loop;
+					case '\n': if (withend) baos.write(c); break loop;
 					default: baos.write(c); break;
 					}
 				}
 			} else {
-				while ( (c = f.read()) > 0 )
+				while ( (c = f.read()) >= 0 )
 					baos.write(c);
 			}
 		} catch ( EOFException e ) {
@@ -582,15 +640,15 @@ public class IoLib extends TwoArgFunction {
 			(LuaValue) NIL:
 			(LuaValue) LuaString.valueUsing(baos.toByteArray());
 	}
-	public static LuaValue freadline(File f) throws IOException {
+	public static LuaValue freadline(File f,boolean withend) throws IOException {
-		return freaduntil(f,true);
+		return freaduntil(f,true,withend);
 	}
 	public static LuaValue freadall(File f) throws IOException {
 		int n = f.remaining();
 		if ( n >= 0 ) {
-			return freadbytes(f, n);
+			return n == 0 ? EMPTYSTRING : freadbytes(f, n);
 		} else {
-			return freaduntil(f,false);
+			return freaduntil(f,false,false);
 		}
 	}
 	public static LuaValue freadnumber(File f) throws IOException {

src/core/org/luaj/vm2/lib/LibFunction.java

@@ -196,7 +196,7 @@ abstract public class LibFunction extends LuaFunction {
 	}
 
 	public LuaValue call() {
-		return argerror(1,"value");
+		return argerror(1,"value expected");
 	}
 	public LuaValue call(LuaValue a) {
 		return call();

src/core/org/luaj/vm2/lib/PackageLib.java

@@ -144,6 +144,7 @@ public class PackageLib extends TwoArgFunction {
 		searchers.set(2, lua_searcher     = new lua_searcher());
 		searchers.set(3, java_searcher    = new java_searcher());
 		package_.set(_SEARCHERS, searchers);
+		package_.set("config", FILE_SEP + "\n;\n?\n!\n-\n");
 		package_.get(_LOADED).set("package", package_);
 		env.set("package", package_);
 		globals.package_ = this;
@@ -236,7 +237,7 @@ public class PackageLib extends TwoArgFunction {
 	}
 
 	public static class loadlib extends VarArgFunction {
-		public Varargs loadlib( Varargs args ) {
+		public Varargs invoke( Varargs args ) {
 			args.checkstring(1);
 			return varargsOf(NIL, valueOf("dynamic libraries not enabled"), valueOf("absent"));
 		}

src/core/org/luaj/vm2/lib/StringLib.java

@@ -83,8 +83,8 @@ public class StringLib extends TwoArgFunction {
 	 */
 	public LuaValue call(LuaValue modname, LuaValue env) {
 		LuaTable string = new LuaTable();
-		string.set("byte", new byte_());
+		string.set("byte", new _byte());
-		string.set("char", new char_());
+		string.set("char", new _char());
 		string.set("dump", new dump());
 		string.set("find", new find());
 		string.set("format", new format());
@@ -117,7 +117,7 @@ public class StringLib extends TwoArgFunction {
 	 * 
 	 * @param args the calling args
 	 */
-	static final class byte_ extends VarArgFunction {
+	static final class _byte extends VarArgFunction {
 		public Varargs invoke(Varargs args) {
 			LuaString s = args.checkstring(1);
 			int l = s.m_length;
@@ -148,7 +148,7 @@ public class StringLib extends TwoArgFunction {
 	 * 
 	 * @param args the calling VM
 	 */
-	static final class char_ extends VarArgFunction {
+	static final class _char extends VarArgFunction {
 		public Varargs invoke(Varargs args) {
 			int n = args.narg();
 			byte[] bytes = new byte[n];
@@ -527,19 +527,20 @@ public class StringLib extends TwoArgFunction {
 		private final int srclen;
 		private final MatchState ms;
 		private int soffset;
+		private int lastmatch;
 		public GMatchAux(Varargs args, LuaString src, LuaString pat) {
 			this.srclen = src.length();
 			this.ms = new MatchState(args, src, pat);
 			this.soffset = 0;
+			this.lastmatch = -1;
 		}
 		public Varargs invoke(Varargs args) {
 			for ( ; soffset<=srclen; soffset++ ) {
 				ms.reset();
 				int res = ms.match(soffset, 0);
-				if ( res >=0 ) {
+				if ( res >=0 && res != lastmatch ) {
 					int soff = soffset;
-					soffset = res;
+					lastmatch = soffset = res;
-					if (soff == res) soffset++; /* empty match? go at least one position */
 					return ms.push_captures( true, soff, res );
 				}
 			}
@@ -598,6 +599,7 @@ public class StringLib extends TwoArgFunction {
 			LuaString src = args.checkstring( 1 );
 			final int srclen = src.length();
 			LuaString p = args.checkstring( 2 );
+			int lastmatch = -1; /* end of last match */
 			LuaValue repl = args.arg( 3 );
 			int max_s = args.optint( 4, srclen + 1 );
 			final boolean anchor = p.length() > 0 && p.charAt( 0 ) == '^';
@@ -610,18 +612,15 @@ public class StringLib extends TwoArgFunction {
 			while ( n < max_s ) {
 				ms.reset();
 				int res = ms.match( soffset, anchor ? 1 : 0 );
-				if ( res != -1 ) {
+				if ( res != -1 && res != lastmatch ) {  /* match? */
 					n++;
-					ms.add_value( lbuf, soffset, res, repl );
+					ms.add_value( lbuf, soffset, res, repl );  /* add replacement to buffer */
+					soffset = lastmatch = res;
 				}
-				if ( res != -1 && res > soffset )
+				else if ( soffset < srclen ) /* otherwise, skip one character */
-					soffset = res;
-				else if ( soffset < srclen )
 					lbuf.append( (byte) src.luaByte( soffset++ ) );
-				else
+				else break;   /* end of subject */
-					break;
+				if ( anchor ) break;
-				if ( anchor )
-					break;
 			}
 			lbuf.append( src.substring( soffset, srclen ) );
 			return varargsOf(lbuf.tostring(), valueOf(n));
@@ -804,6 +803,8 @@ public class StringLib extends TwoArgFunction {
 	private static final LuaString SPECIALS = valueOf("^$*+?.([%-");
 	private static final int MAX_CAPTURES = 32;
 	
+	private static final int MAXCCALLS = 200;
+	
 	private static final int CAP_UNFINISHED = -1;
 	private static final int CAP_POSITION = -2;
 	
@@ -821,7 +822,7 @@ public class StringLib extends TwoArgFunction {
 	static {
 		CHAR_TABLE = new byte[256];
 		
-		for ( int i = 0; i < 256; ++i ) {
+		for ( int i = 0; i < 128; ++i ) {
 			final char c = (char) i;
 			CHAR_TABLE[i] = (byte)( ( Character.isDigit( c ) ? MASK_DIGIT : 0 ) |
 							( Character.isLowerCase( c ) ? MASK_LOWERCASE : 0 ) |
@@ -830,7 +831,7 @@ public class StringLib extends TwoArgFunction {
 			if ( ( c >= 'a' && c <= 'f' ) || ( c >= 'A' && c <= 'F' ) || ( c >= '0' && c <= '9' ) ) {
 				CHAR_TABLE[i] |= MASK_HEXDIGIT;
 			}
-			if ( ( c >= '!' && c <= '/' ) || ( c >= ':' && c <= '@' ) ) {
+			if ( ( c >= '!' && c <= '/' ) || ( c >= ':' && c <= '@' ) || ( c >= '[' && c <= '`' ) || ( c >= '{' && c <= '~' ) ) {
 				CHAR_TABLE[i] |= MASK_PUNCT;
 			}
 			if ( ( CHAR_TABLE[i] & ( MASK_LOWERCASE | MASK_UPPERCASE ) ) != 0 ) {
@@ -842,11 +843,12 @@ public class StringLib extends TwoArgFunction {
 		CHAR_TABLE['\r'] |= MASK_SPACE;
 		CHAR_TABLE['\n'] |= MASK_SPACE;
 		CHAR_TABLE['\t'] |= MASK_SPACE;
-		CHAR_TABLE[0x0C /* '\v' */ ] |= MASK_SPACE;
+		CHAR_TABLE[0x0B /* '\v' */ ] |= MASK_SPACE;
 		CHAR_TABLE['\f'] |= MASK_SPACE;
 	};
 	
 	static class MatchState {
+		int matchdepth;  /* control for recursive depth (to avoid C stack overflow) */
 		final LuaString s;
 		final LuaString p;
 		final Varargs args;
@@ -861,10 +863,12 @@ public class StringLib extends TwoArgFunction {
 			this.level = 0;
 			this.cinit = new int[ MAX_CAPTURES ];
 			this.clen = new int[ MAX_CAPTURES ];
+			this.matchdepth = MAXCCALLS;
 		}
 		
 		void reset() {
 			level = 0;
+			this.matchdepth = MAXCCALLS;
 		}
 		
 		private void add_s( Buffer lbuf, LuaString news, int soff, int e ) {
@@ -939,7 +943,7 @@ public class StringLib extends TwoArgFunction {
 				if ( i == 0 ) {
 					return s.substring( soff, end );
 				} else {
-					return error( "invalid capture index" );
+					return error( "invalid capture index %" + (i + 1) );
 				}
 			} else {
 				int l = clen[i];
@@ -958,7 +962,7 @@ public class StringLib extends TwoArgFunction {
 		private int check_capture( int l ) {
 			l -= '1';
 			if ( l < 0 || l >= level || this.clen[l] == CAP_UNFINISHED ) {
-				error("invalid capture index");
+				error("invalid capture index %" + (l + 1));
 			}
 			return l;
 		}
@@ -1008,9 +1012,10 @@ public class StringLib extends TwoArgFunction {
 			case 'c': res = ( cdata & MASK_CONTROL ) != 0; break;
 			case 'p': res = ( cdata & MASK_PUNCT ) != 0; break;
 			case 's': res = ( cdata & MASK_SPACE ) != 0; break;
+			case 'g': res = ( cdata & ( MASK_ALPHA | MASK_DIGIT | MASK_PUNCT ) ) != 0; break;
 			case 'w': res = ( cdata & ( MASK_ALPHA | MASK_DIGIT ) ) != 0; break;
 			case 'x': res = ( cdata & MASK_HEXDIGIT ) != 0; break;
-			case 'z': res = ( c == 0 ); break;
+			case 'z': res = ( c == 0 ); break;  /* deprecated option */
 			default: return cl == c;
 			}
 			return ( lcl == cl ) ? res : !res;
@@ -1052,6 +1057,8 @@ public class StringLib extends TwoArgFunction {
 		 * where match ends, otherwise returns -1.
 		 */
 		int match( int soffset, int poffset ) {
+			if (matchdepth-- == 0) error("pattern too complex");
+			try {
 				while ( true ) {
 					// Check if we are at the end of the pattern -
 					// equivalent to the '\0' case in the C version, but our pattern
@@ -1078,7 +1085,7 @@ public class StringLib extends TwoArgFunction {
 						case 'f': {
 							poffset += 2;
 							if ( poffset == p.length() || p.luaByte( poffset ) != '[' ) {
-							error("Missing '[' after '%f' in pattern");
+								error("missing '[' after '%f' in pattern");
 							}
 							int ep = classend( poffset );
 							int previous = ( soffset == 0 ) ? '\0' : s.luaByte( soffset - 1 );
@@ -1128,6 +1135,9 @@ public class StringLib extends TwoArgFunction {
 						continue;
 					}
 				}
+			} finally {
+				matchdepth++;
+			}
 		}
 		
 		int max_expand( int soff, int poff, int ep ) {
@@ -1191,7 +1201,7 @@ public class StringLib extends TwoArgFunction {
 		int matchbalance( int soff, int poff ) {
 			final int plen = p.length();
 			if ( poff == plen || poff + 1 == plen ) {
-				error( "unbalanced pattern" );
+				error( "malformed pattern (missing arguments to '%b')" );
 			}
 			final int slen = s.length();
 			if ( soff >= slen )

src/core/org/luaj/vm2/lib/TableLib.java

@@ -74,12 +74,6 @@ public class TableLib extends TwoArgFunction {
 		return NIL;
 	}
 	
-	static class TableLibFunction extends LibFunction {
-		public LuaValue call() {
-			return argerror(1, "table expected, got no value");
-		}
-	}
-	
 	// "concat" (table [, sep [, i [, j]]]) -> string
 	static class concat extends TableLibFunction {
 		public LuaValue call(LuaValue list) {
@@ -100,18 +94,22 @@ public class TableLib extends TwoArgFunction {
 	static class insert extends VarArgFunction {
 		public Varargs invoke(Varargs args) {
 			switch (args.narg()) {
-			case 0: case 1: {
-				return argerror(2, "value expected");
-			}
 			case 2: {
-				LuaTable table = args.arg1().checktable();
+				LuaTable table = args.checktable(1);
 				table.insert(table.length()+1,args.arg(2));
 				return NONE;
 			}
-			default: {
+			case 3: {
-				args.arg1().checktable().insert(args.checkint(2),args.arg(3));
+				LuaTable table = args.checktable(1);
+				int pos = args.checkint(2);
+				int max = table.length() + 1;
+				if (pos < 1 || pos > max) argerror(2, "position out of bounds: " + pos + " not between 1 and " + max);
+				table.insert(pos, args.arg(3));
 				return NONE;
 			}
+			default: {
+				return error("wrong number of arguments to 'table.insert': " + args.narg() + " (must be 2 or 3)");
+			}
 			}
 		}
 	}
@@ -128,15 +126,21 @@ public class TableLib extends TwoArgFunction {
 	// "remove" (table [, pos]) -> removed-ele
 	static class remove extends VarArgFunction {
 		public Varargs invoke(Varargs args) {
-			return args.arg1().checktable().remove(args.optint(2, 0));
+			LuaTable table = args.checktable(1);
+			int size = table.length();
+			int pos = args.optint(2, size);
+			if (pos != size && (pos < 1 || pos > size + 1)) {
+				argerror(2, "position out of bounds: " + pos + " not between 1 and " + (size + 1));
+			}
+			return table.remove(pos);
 		}
 	}
 
 	// "sort" (table [, comp])
 	static class sort extends VarArgFunction {
 		public Varargs invoke(Varargs args) {
-			args.arg1().checktable().sort(
+			args.checktable(1).sort(
-					args.arg(2).isnil()? NIL: args.arg(2).checkfunction());
+					args.isnil(2)? NIL: args.checkfunction(2));
 			return NONE;
 		}
 	}
@@ -146,11 +150,9 @@ public class TableLib extends TwoArgFunction {
 	static class unpack extends VarArgFunction {
 		public Varargs invoke(Varargs args) {
 			LuaTable t = args.checktable(1);
-			switch (args.narg()) {
+			// do not waste resource for calc rawlen if arg3 is not nil
-			case 1: return t.unpack();
+			int len = args.arg(3).isnil() ? t.length() : 0;
-			case 2: return t.unpack(args.checkint(2));
+			return t.unpack(args.optint(2, 1), args.optint(3, len));
-			default: return t.unpack(args.checkint(2), args.checkint(3));
-			}
 		}
 	}
 }

src/core/org/luaj/vm2/lib/TableLibFunction.java

@@ -0,0 +1,9 @@
+package org.luaj.vm2.lib;
+
+import org.luaj.vm2.LuaValue;
+
+class TableLibFunction extends LibFunction {
+	public LuaValue call() {
+		return argerror(1, "table expected, got no value");
+	}
+}

src/jse/org/luaj/vm2/lib/jse/JavaMethod.java

@@ -114,8 +114,19 @@ class JavaMethod extends JavaMember {
 
 		final JavaMethod[] methods;
 
+		// no parammeter method index in overload method
+		int noArgMethodIndex = -1;
+		
 		Overload(JavaMethod[] methods) {
 			this.methods = methods;
+			JavaMethod m;
+			for (int i=0; i<methods.length; i++) {
+				m = methods[i];
+				if (m.fixedargs.length == 0 && m.varargs == null) {
+					noArgMethodIndex = i;
+					break;
+				}
+			}
 		}
 
 		public LuaValue call() {
@@ -140,6 +151,10 @@ class JavaMethod extends JavaMember {
 
 		private LuaValue invokeBestMethod(Object instance, Varargs args) {
 			JavaMethod best = null;
+			int n = args.narg();
+			if (n == 0 && noArgMethodIndex != -1) {
+				best = methods[noArgMethodIndex];
+			} else {
 				int score = CoerceLuaToJava.SCORE_UNCOERCIBLE;
 				for ( int i=0; i<methods.length; i++ ) {
 					int s = methods[i].score(args);
@@ -150,6 +165,7 @@ class JavaMethod extends JavaMember {
 							break;
 					}
 				}
+			}
 			
 			// any match? 
 			if ( best == null )

src/jse/org/luaj/vm2/lib/jse/JseIoLib.java

@@ -133,7 +133,7 @@ public class JseIoLib extends IoLib {
 			this( null, null, o );
 		}
 		public String tojstring() {
-			return "file ("+this.hashCode()+")";
+			return "file (" + (this.closed ? "closed" : String.valueOf(this.hashCode())) + ")";
 		}
 		public boolean isstdfile() {
 			return file == null;
@@ -321,7 +321,7 @@ public class JseIoLib extends IoLib {
 		}
 
 		public int remaining() throws IOException {
-			return 0;
+			return -1;
 		}
 
 		public int peek() throws IOException, EOFException {

src/jse/org/luaj/vm2/lib/jse/JseOsLib.java

@@ -126,7 +126,7 @@ public class JseOsLib extends org.luaj.vm2.lib.OsLib {
 	protected String tmpname() {
 		try {
 			java.io.File f = java.io.File.createTempFile(TMP_PREFIX ,TMP_SUFFIX);
-			return f.getName();
+			return f.getAbsolutePath();
 		} catch ( IOException ioe ) {
 			return super.tmpname();
 		}

src/jse/org/luaj/vm2/lib/jse/JseStringLib.java

@@ -0,0 +1,39 @@
+/*******************************************************************************
+* Copyright (c) 2009 Luaj.org. All rights reserved.
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy
+* of this software and associated documentation files (the "Software"), to deal
+* in the Software without restriction, including without limitation the rights
+* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+* copies of the Software, and to permit persons to whom the Software is
+* furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in
+* all copies or substantial portions of the Software.
+* 
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+* THE SOFTWARE.
+******************************************************************************/
+package org.luaj.vm2.lib.jse;
+
+public class JseStringLib extends org.luaj.vm2.lib.StringLib {
+	
+	/** public constructor */
+	public JseStringLib() {
+	}
+
+	protected String format(String src, double x) {
+		String out;
+		try {
+			out = String.format(src, new Object[] {Double.valueOf(x)});
+		} catch (Throwable e) {
+			out = super.format(src, x);
+		}
+		return out;
+	}
+}