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Luaj 2.0 for the jse platform
/*******************************************************************************
* Copyright (c) 2010 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.luajc;
import org.luaj.vm2.Buffer;
import org.luaj.vm2.Lua;
import org.luaj.vm2.Prototype;
/**
* TODO:
* propogate constants
* loader can find inner classes
*/
public class JavaGen {
public final String classname;
public final byte[] bytecode;
public final JavaGen[] inners;
public JavaGen( Prototype p, String classname, String filename ) {
this( new ProtoInfo(p,classname), classname, filename );
}
private JavaGen( ProtoInfo pi, String classname, String filename ) {
this.classname = classname;
// build this class
JavaBuilder builder = new JavaBuilder(pi, classname, filename);
scanInstructions(pi, classname, builder);
this.bytecode = builder.completeClass();
// build sub-prototypes
if ( pi.subprotos != null ) {
int n = pi.subprotos.length;
inners = new JavaGen[n];
for ( int i=0; i b+1 ) {
builder.tobuffer();
for ( int k=c; --k>=b; )
builder.concatbuffer();
builder.tovalue();
} else {
builder.concatvalue();
}
builder.storeLocal(pc, a);
break;
case Lua.OP_LOADBOOL:/* A B C R(A):= (Bool)B: if (C) pc++ */
builder.loadBoolean( b!=0 );
builder.storeLocal( pc, a );
if ( c!=0 )
builder.addBranch(pc, JavaBuilder.BRANCH_GOTO, pc+2);
break;
case Lua.OP_JMP: /* sBx pc+=sBx */
builder.addBranch(pc, JavaBuilder.BRANCH_GOTO, pc+1+sbx);
break;
case Lua.OP_EQ: /* A B C if ((RK(B) == RK(C)) ~= A) then pc++ */
case Lua.OP_LT: /* A B C if ((RK(B) < RK(C)) ~= A) then pc++ */
case Lua.OP_LE: /* A B C if ((RK(B) <= RK(C)) ~= A) then pc++ */
loadLocalOrConstant( p, builder, pc, b );
loadLocalOrConstant( p, builder, pc, c );
builder.compareop(o);
builder.addBranch(pc, (a!=0? JavaBuilder.BRANCH_IFEQ: JavaBuilder.BRANCH_IFNE), pc+2);
break;
case Lua.OP_TEST: /* A C if not (R(A) <=> C) then pc++ */
builder.loadLocal( pc, a );
builder.toBoolean();
builder.addBranch(pc, (c!=0? JavaBuilder.BRANCH_IFEQ: JavaBuilder.BRANCH_IFNE), pc+2);
break;
case Lua.OP_TESTSET: /* A B C if (R(B) <=> C) then R(A):= R(B) else pc++ */
builder.loadLocal( pc, b );
builder.toBoolean();
builder.addBranch(pc, (c!=0? JavaBuilder.BRANCH_IFEQ: JavaBuilder.BRANCH_IFNE), pc+2);
builder.loadLocal( pc, b );
builder.storeLocal( pc, a );
break;
case Lua.OP_CALL: /* A B C R(A), ... ,R(A+C-2):= R(A)(R(A+1), ... ,R(A+B-1)) */
// load function
builder.loadLocal(pc, a);
// load args
int narg = b - 1;
switch ( narg ) {
case 0: case 1: case 2: case 3:
for ( int i=1; i 3
builder.newVarargs( pc, a+1, b-1 );
narg = -1;
break;
case -1: // prev vararg result
loadVarargResults( builder, pc, a+1, vresultbase );
narg = -1;
break;
}
// call or invoke
boolean useinvoke = narg<0 || c<1 || c>2;
if ( useinvoke )
builder.invoke(narg);
else
builder.call(narg);
// handle results
switch ( c ) {
case 1:
builder.pop();
break;
case 2:
if ( useinvoke )
builder.arg( 1 );
builder.storeLocal(pc, a);
break;
default: // fixed result count - unpack args
for ( int i=1; i 1
builder.newVarargs( pc, a+1, b-1 );
break;
case 0: // prev vararg result
loadVarargResults( builder, pc, a+1, vresultbase );
break;
}
builder.newTailcallVarargs();
builder.areturn();
break;
case Lua.OP_RETURN: /* A B return R(A), ... ,R(A+B-2) (see note) */
if ( c == 1 ) {
builder.loadNone();
} else {
switch ( b ) {
case 0: loadVarargResults( builder, pc, a, vresultbase ); break;
case 1: builder.loadNone(); break;
case 2: builder.loadLocal(pc, a); break;
default: builder.newVarargs(pc, a, b-1); break;
}
}
builder.areturn();
break;
case Lua.OP_FORPREP: /* A sBx R(A)-=R(A+2): pc+=sBx */
builder.loadLocal(pc, a);
builder.loadLocal(pc, a+2);
builder.binaryop( Lua.OP_SUB );
builder.storeLocal(pc, a);
builder.addBranch(pc, JavaBuilder.BRANCH_GOTO, pc+1+sbx);
break;
case Lua.OP_FORLOOP: /* A sBx R(A)+=R(A+2): if R(A) =2)
builder.dup();
builder.arg( 1 );
builder.dup();
builder.storeLocal(pc, a+2);
builder.storeLocal(pc, a+3);
// v[2]..v[c], use varargs from stack
for ( int j=2; j<=c; j++ ) {
if ( j 0 ) {
builder.setlistStack( pc, a+1, index0, nstack );
index0 += nstack;
}
builder.setlistVarargs( index0, vresultbase );
} else {
builder.setlistStack( pc, a+1, index0, b );
builder.pop();
}
break;
case Lua.OP_CLOSE: /* A close all variables in the stack up to (>=) R(A)*/
break;
case Lua.OP_CLOSURE: /* A Bx R(A):= closure(KPROTO[Bx], R(A), ... ,R(A+n)) */
{
Prototype newp = p.p[bx];
String protoname = closureName(classname, bx);
int nup = newp.nups;
builder.closureCreate( protoname );
if ( nup > 0 )
builder.dup();
builder.storeLocal( pc, a );
if ( nup > 0 ) {
for ( int up=0; up