/*******************************************************************************
* Copyright (c) 2009-2011 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.compiler;
import java.io.IOException;
import java.io.InputStream;
import java.util.Hashtable;
import org.luaj.vm2.LoadState;
import org.luaj.vm2.LocVars;
import org.luaj.vm2.Lua;
import org.luaj.vm2.LuaClosure;
import org.luaj.vm2.LuaError;
import org.luaj.vm2.LuaFunction;
import org.luaj.vm2.LuaString;
import org.luaj.vm2.LuaValue;
import org.luaj.vm2.Prototype;
import org.luaj.vm2.LoadState.LuaCompiler;
/**
* Compiler for Lua.
* <p>
* Compiles lua source files into lua bytecode within a {@link Prototype},
* loads lua binary files directly into a{@link Prototype},
* and optionaly instantiates a {@link LuaClosure} around the result
* using a user-supplied environment.
* <p>
* Implements the {@link LuaCompiler} interface for loading
* initialized chunks, which is an interface common to
* lua bytecode compiling and java bytecode compiling.
* <p>
* Teh {@link LuaC} compiler is installed by default by both the
* {@link JsePlatform} and {@link JmePlatform} classes,
* so in the following example, the default {@link LuaC} compiler
* will be used:
* <pre> {@code
* LuaValue _G = JsePlatform.standardGlobals();
* LoadState.load( new ByteArrayInputStream("print 'hello'".getBytes()), "main.lua", _G ).call();
* } </pre>
* @see LuaCompiler
* @see LuaJC
* @see JsePlatform
* @see JmePlatform
* @see BaseLib
* @see LuaValue
* @see LuaCompiler
* @see Prototype
*/
public class LuaC extends Lua implements LuaCompiler {
public static final LuaC instance = new LuaC();
/** Install the compiler so that LoadState will first
* try to use it when handed bytes that are
* not already a compiled lua chunk.
*/
public static void install() {
org.luaj.vm2.LoadState.compiler = instance;
}
protected static void _assert(boolean b) {
if (!b)
throw new LuaError("compiler assert failed");
}
public static final int MAXSTACK = 250;
static final int LUAI_MAXUPVALUES = 60;
static final int LUAI_MAXVARS = 200;
static final int NO_REG = MAXARG_A;
/* OpMode - basic instruction format */
static final int
iABC = 0,
iABx = 1,
iAsBx = 2;
/* OpArgMask */
static final int
OpArgN = 0, /* argument is not used */
OpArgU = 1, /* argument is used */
OpArgR = 2, /* argument is a register or a jump offset */
OpArgK = 3; /* argument is a constant or register/constant */
static void SET_OPCODE(InstructionPtr i,int o) {
i.set( ( i.get() & (MASK_NOT_OP)) | ((o << POS_OP) & MASK_OP) );
}
static void SETARG_A(InstructionPtr i,int u) {
i.set( ( i.get() & (MASK_NOT_A)) | ((u << POS_A) & MASK_A) );
}
static void SETARG_B(InstructionPtr i,int u) {
i.set( ( i.get() & (MASK_NOT_B)) | ((u << POS_B) & MASK_B) );
}
static void SETARG_C(InstructionPtr i,int u) {
i.set( ( i.get() & (MASK_NOT_C)) | ((u << POS_C) & MASK_C) );
}
static void SETARG_Bx(InstructionPtr i,int u) {
i.set( ( i.get() & (MASK_NOT_Bx)) | ((u << POS_Bx) & MASK_Bx) );
}
static void SETARG_sBx(InstructionPtr i,int u) {
SETARG_Bx( i, u + MAXARG_sBx );
}
static int CREATE_ABC(int o, int a, int b, int c) {
return ((o << POS_OP) & MASK_OP) |
((a << POS_A) & MASK_A) |
((b << POS_B) & MASK_B) |
((c << POS_C) & MASK_C) ;
}
static int CREATE_ABx(int o, int a, int bc) {
return ((o << POS_OP) & MASK_OP) |
((a << POS_A) & MASK_A) |
((bc << POS_Bx) & MASK_Bx) ;
}
// vector reallocation
static LuaValue[] realloc(LuaValue[] v, int n) {
LuaValue[] a = new LuaValue[n];
if ( v != null )
System.arraycopy(v, 0, a, 0, Math.min(v.length,n));
return a;
}
static Prototype[] realloc(Prototype[] v, int n) {
Prototype[] a = new Prototype[n];
if ( v != null )
System.arraycopy(v, 0, a, 0, Math.min(v.length,n));
return a;
}
static LuaString[] realloc(LuaString[] v, int n) {
LuaString[] a = new LuaString[n];
if ( v != null )
System.arraycopy(v, 0, a, 0, Math.min(v.length,n));
return a;
}
static LocVars[] realloc(LocVars[] v, int n) {
LocVars[] a = new LocVars[n];
if ( v != null )
System.arraycopy(v, 0, a, 0, Math.min(v.length,n));
return a;
}
static int[] realloc(int[] v, int n) {
int[] a = new int[n];
if ( v != null )
System.arraycopy(v, 0, a, 0, Math.min(v.length,n));
return a;
}
static byte[] realloc(byte[] v, int n) {
byte[] a = new byte[n];
if ( v != null )
System.arraycopy(v, 0, a, 0, Math.min(v.length,n));
return a;
}
public int nCcalls;
Hashtable strings;
protected LuaC() {}
private LuaC(Hashtable strings) {
this.strings = strings;
}
/** Load into a Closure or LuaFunction, with the supplied initial environment */
public LuaFunction load(InputStream stream, String name, LuaValue env) throws IOException {
Prototype p = compile( stream, name );
return new LuaClosure( p, env );
}
/** Compile a prototype or load as a binary chunk */
public static Prototype compile(InputStream stream, String name) throws IOException {
int firstByte = stream.read();
return ( firstByte == '\033' )?
LoadState.loadBinaryChunk(firstByte, stream, name):
(new LuaC(new Hashtable())).luaY_parser(firstByte, stream, name);
}
/** Parse the input */
private Prototype luaY_parser(int firstByte, InputStream z, String name) {
LexState lexstate = new LexState(this, z);
FuncState funcstate = new FuncState();
// lexstate.buff = buff;
lexstate.setinput( this, firstByte, z, (LuaString) LuaValue.valueOf(name) );
lexstate.open_func(funcstate);
/* main func. is always vararg */
funcstate.f.is_vararg = LuaC.VARARG_ISVARARG;
funcstate.f.source = (LuaString) LuaValue.valueOf(name);
lexstate.next(); /* read first token */
lexstate.chunk();
lexstate.check(LexState.TK_EOS);
lexstate.close_func();
LuaC._assert (funcstate.prev == null);
LuaC._assert (funcstate.f.nups == 0);
LuaC._assert (lexstate.fs == null);
return funcstate.f;
}
// look up and keep at most one copy of each string
public LuaString newTString(byte[] bytes, int offset, int len) {
LuaString tmp = LuaString.valueOf(bytes, offset, len);
LuaString v = (LuaString) strings.get(tmp);
if ( v == null ) {
// must copy bytes, since bytes could be from reusable buffer
byte[] copy = new byte[len];
System.arraycopy(bytes, offset, copy, 0, len);
v = LuaString.valueOf(copy);
strings.put(v, v);
}
return v;
}
public String pushfstring(String string) {
return string;
}
public LuaFunction load(Prototype p, String filename, LuaValue env) {
return new LuaClosure( p, env );
}
}