6 public class BuildFlat {
10 public BuildFlat(State st) {
12 temptovar=new Hashtable();
15 public Hashtable getMap() {
19 public void buildFlat() {
20 Iterator it=state.getClassSymbolTable().getDescriptorsIterator();
22 ClassDescriptor cn=(ClassDescriptor)it.next();
26 Iterator task_it=state.getTaskSymbolTable().getDescriptorsIterator();
27 while(task_it.hasNext()) {
28 TaskDescriptor td=(TaskDescriptor)task_it.next();
33 private void flattenTask(TaskDescriptor td) {
34 BlockNode bn=state.getMethodBody(td);
35 FlatNode fn=flattenBlockNode(bn).getBegin();
36 FlatFlagActionNode ffan=new FlatFlagActionNode(false);
38 FlatMethod fm=new FlatMethod(td, ffan);
40 for(int i=0;i<td.numParameters();i++) {
41 fm.addParameterTemp(getTempforVar(td.getParameter(i)));
44 /* Flatten Vector of Flag Effects */
45 Vector flags=td.getFlagEffects();
46 updateFlagActionNode(ffan,flags);
48 state.addFlatCode(td,fm);
52 /* This method transforms a vector of FlagEffects into the FlatFlagActionNode */
53 private void updateFlagActionNode(FlatFlagActionNode ffan, Vector flags) {
54 for(int i=0;i<flags.size();i++) {
55 FlagEffects fes=(FlagEffects)flags.get(i);
56 TempDescriptor flagtemp=getTempforVar(fes.getVar());
57 for(int j=0;j<fes.numEffects();j++) {
58 FlagEffect fe=fes.getEffect(j);
59 ffan.addFlagAction(flagtemp, fe.getFlag(), fe.getStatus());
64 private void flattenClass(ClassDescriptor cn) {
65 Iterator methodit=cn.getMethods();
66 while(methodit.hasNext()) {
67 MethodDescriptor md=(MethodDescriptor)methodit.next();
68 BlockNode bn=state.getMethodBody(md);
69 FlatNode fn=flattenBlockNode(bn).getBegin();
70 FlatMethod fm=new FlatMethod(md, fn);
72 fm.addParameterTemp(getTempforVar(md.getThis()));
73 for(int i=0;i<md.numParameters();i++) {
74 fm.addParameterTemp(getTempforVar(md.getParameter(i)));
76 System.out.println(fm.printMethod());
77 state.addFlatCode(md,fm);
81 private NodePair flattenBlockNode(BlockNode bn) {
84 for(int i=0;i<bn.size();i++) {
85 NodePair np=flattenBlockStatementNode(bn.get(i));
86 FlatNode np_begin=np.getBegin();
87 FlatNode np_end=np.getEnd();
94 end.addNext(np_begin);
99 end=begin=new FlatNop();
101 return new NodePair(begin,end);
104 private NodePair flattenBlockExpressionNode(BlockExpressionNode en) {
105 TempDescriptor tmp=TempDescriptor.tempFactory("neverused",en.getExpression().getType());
106 return flattenExpressionNode(en.getExpression(),tmp);
109 private NodePair flattenCastNode(CastNode cn,TempDescriptor out_temp) {
110 TempDescriptor tmp=TempDescriptor.tempFactory("tocast",cn.getExpression().getType());
111 NodePair np=flattenExpressionNode(cn.getExpression(), tmp);
112 FlatCastNode fcn=new FlatCastNode(cn.getType(), tmp, out_temp);
113 np.getEnd().addNext(fcn);
114 return new NodePair(np.getBegin(),fcn);
117 private NodePair flattenLiteralNode(LiteralNode ln,TempDescriptor out_temp) {
118 FlatLiteralNode fln=new FlatLiteralNode(ln.getType(), ln.getValue(), out_temp);
119 return new NodePair(fln,fln);
122 private NodePair flattenCreateObjectNode(CreateObjectNode con,TempDescriptor out_temp) {
123 TypeDescriptor td=con.getType();
125 FlatNew fn=new FlatNew(td, out_temp);
126 TempDescriptor[] temps=new TempDescriptor[con.numArgs()];
129 for(int i=0;i<con.numArgs();i++) {
130 ExpressionNode en=con.getArg(i);
131 TempDescriptor tmp=TempDescriptor.tempFactory("arg",en.getType());
133 NodePair np=flattenExpressionNode(en, tmp);
134 last.addNext(np.getBegin());
137 MethodDescriptor md=con.getConstructor();
138 //Call to constructor
139 FlatCall fc=new FlatCall(md, null, out_temp, temps);
142 if (con.getFlagEffects()!=null) {
143 FlatFlagActionNode ffan=new FlatFlagActionNode(false);
144 FlagEffects fes=con.getFlagEffects();
145 TempDescriptor flagtemp=outtemp;
146 for(int j=0;j<fes.numEffects();j++) {
147 FlagEffect fe=fes.getEffect(j);
148 ffan.addFlagAction(flagtemp, fe.getFlag(), fe.getStatus());
153 return new NodePair(fn,last);
157 TempDescriptor[] temps=new TempDescriptor[con.numArgs()];
158 for (int i=0;i<con.numArgs();i++) {
159 ExpressionNode en=con.getArg(i);
160 TempDescriptor tmp=TempDescriptor.tempFactory("arg",en.getType());
162 NodePair np=flattenExpressionNode(en, tmp);
166 last.addNext(np.getBegin());
169 TempDescriptor tmp2=(i==0)?
171 TempDescriptor.tempFactory("arg",en.getType());
173 FlatNew fn=new FlatNew(td, out_temp, temps[0]);
175 if (temps.length>1) {
176 NodePair np=generateNewArrayLoop(temps, td.dereference(), out_temp, 0);
177 fn.addNext(np.getBegin());
178 return new NodePair(first,np.getEnd());
180 return new NodePair(first, fn);
184 private NodePair generateNewArrayLoop(TempDescriptor[] temparray, TypeDescriptor td, TempDescriptor tmp, int i) {
185 TempDescriptor index=TempDescriptor.tempFactory("index",new TypeDescriptor(TypeDescriptor.INT));
186 TempDescriptor tmpone=TempDescriptor.tempFactory("index",new TypeDescriptor(TypeDescriptor.INT));
187 FlatNop fnop=new FlatNop();//last node
190 FlatLiteralNode fln=new FlatLiteralNode(index.getType(),new Integer(0),index);
192 FlatLiteralNode fln2=new FlatLiteralNode(tmpone.getType(),new Integer(1),tmpone);
194 TempDescriptor tmpbool=TempDescriptor.tempFactory("comp",new TypeDescriptor(TypeDescriptor.BOOLEAN));
196 FlatOpNode fcomp=new FlatOpNode(tmpbool,index,temparray[i],new Operation(Operation.LT));
197 FlatCondBranch fcb=new FlatCondBranch(tmpbool);
199 TempDescriptor new_tmp=TempDescriptor.tempFactory("tmp",td);
200 FlatNew fn=new FlatNew(td, new_tmp, temparray[i+1]);
201 FlatSetElementNode fsen=new FlatSetElementNode(tmp,index,new_tmp);
203 FlatOpNode fon=new FlatOpNode(index,index,tmpone,new Operation(Operation.ADD));
209 fcb.addFalseNext(fnop);
211 //Recursive call here
212 if ((i+2)<temparray.length) {
213 NodePair np2=generateNewArrayLoop(temparray, td.dereference(), new_tmp, i+1);
214 fsen.addNext(np2.getBegin());
215 np2.getEnd().addNext(fon);
220 return new NodePair(fln, fnop);
223 private NodePair flattenMethodInvokeNode(MethodInvokeNode min,TempDescriptor out_temp) {
224 TempDescriptor[] temps=new TempDescriptor[min.numArgs()];
227 TempDescriptor thisarg=null;
229 if (min.getExpression()!=null) {
230 thisarg=TempDescriptor.tempFactory("thisarg",min.getExpression().getType());
231 NodePair np=flattenExpressionNode(min.getExpression(),thisarg);
237 for(int i=0;i<min.numArgs();i++) {
238 ExpressionNode en=min.getArg(i);
239 TempDescriptor td=TempDescriptor.tempFactory("arg",en.getType());
241 NodePair np=flattenExpressionNode(en, td);
245 last.addNext(np.getBegin());
249 MethodDescriptor md=min.getMethod();
251 //Call to constructor
254 if(md.getReturnType()==null||md.getReturnType().isVoid())
255 fc=new FlatCall(md, null, thisarg, temps);
257 fc=new FlatCall(md, out_temp, thisarg, temps);
262 return new NodePair(first,fc);
265 private NodePair flattenFieldAccessNode(FieldAccessNode fan,TempDescriptor out_temp) {
266 TempDescriptor tmp=TempDescriptor.tempFactory("temp",fan.getExpression().getType());
267 NodePair npe=flattenExpressionNode(fan.getExpression(),tmp);
268 FlatFieldNode fn=new FlatFieldNode(fan.getField(),tmp,out_temp);
269 npe.getEnd().addNext(fn);
270 return new NodePair(npe.getBegin(),fn);
273 private NodePair flattenArrayAccessNode(ArrayAccessNode aan,TempDescriptor out_temp) {
274 TempDescriptor tmp=TempDescriptor.tempFactory("temp",aan.getExpression().getType());
275 TempDescriptor tmpindex=TempDescriptor.tempFactory("temp",aan.getIndex().getType());
276 NodePair npe=flattenExpressionNode(aan.getExpression(),tmp);
277 NodePair npi=flattenExpressionNode(aan.getIndex(),tmpindex);
278 FlatElementNode fn=new FlatElementNode(tmp,tmpindex,out_temp);
279 npe.getEnd().addNext(npi.getBegin());
280 npi.getEnd().addNext(fn);
281 return new NodePair(npe.getBegin(),fn);
284 private NodePair flattenAssignmentNode(AssignmentNode an,TempDescriptor out_temp) {
286 // left side is variable
287 // left side is field
289 Operation base=an.getOperation().getBaseOp();
290 TempDescriptor src_tmp=TempDescriptor.tempFactory("src",an.getSrc().getType());
291 NodePair np_src=flattenExpressionNode(an.getSrc(),src_tmp);
292 FlatNode last=np_src.getEnd();
294 TempDescriptor src_tmp2=TempDescriptor.tempFactory("tmp", an.getDest().getType());
295 NodePair np_dst_init=flattenExpressionNode(an.getDest(),src_tmp2);
296 last.addNext(np_dst_init.getBegin());
297 TempDescriptor dst_tmp=TempDescriptor.tempFactory("dst_tmp",an.getDest().getType());
298 FlatOpNode fon=new FlatOpNode(dst_tmp, src_tmp,src_tmp2, base);
299 np_dst_init.getEnd().addNext(fon);
304 if (an.getDest().kind()==Kind.FieldAccessNode) {
305 FieldAccessNode fan=(FieldAccessNode)an.getDest();
306 ExpressionNode en=fan.getExpression();
307 TempDescriptor dst_tmp=TempDescriptor.tempFactory("dst",en.getType());
308 NodePair np_baseexp=flattenExpressionNode(en, dst_tmp);
309 last.addNext(np_baseexp.getBegin());
310 FlatSetFieldNode fsfn=new FlatSetFieldNode(dst_tmp, fan.getField(), src_tmp);
311 np_baseexp.getEnd().addNext(fsfn);
312 return new NodePair(np_src.getBegin(), fsfn);
313 } else if (an.getDest().kind()==Kind.ArrayAccessNode) {
314 ArrayAccessNode aan=(ArrayAccessNode)an.getDest();
315 ExpressionNode en=aan.getExpression();
316 ExpressionNode enindex=aan.getIndex();
317 TempDescriptor dst_tmp=TempDescriptor.tempFactory("dst",en.getType());
318 TempDescriptor index_tmp=TempDescriptor.tempFactory("index",enindex.getType());
319 NodePair np_baseexp=flattenExpressionNode(en, dst_tmp);
320 NodePair np_indexexp=flattenExpressionNode(enindex, index_tmp);
321 last.addNext(np_baseexp.getBegin());
322 np_baseexp.getEnd().addNext(np_indexexp.getBegin());
323 FlatSetElementNode fsen=new FlatSetElementNode(dst_tmp, index_tmp, src_tmp);
324 np_indexexp.getEnd().addNext(fsen);
325 return new NodePair(np_src.getBegin(), fsen);
326 } else if (an.getDest().kind()==Kind.NameNode) {
327 NameNode nn=(NameNode)an.getDest();
328 if (nn.getExpression()!=null) {
329 FieldAccessNode fan=(FieldAccessNode)nn.getExpression();
330 ExpressionNode en=fan.getExpression();
331 TempDescriptor dst_tmp=TempDescriptor.tempFactory("dst",en.getType());
332 NodePair np_baseexp=flattenExpressionNode(en, dst_tmp);
333 last.addNext(np_baseexp.getBegin());
334 FlatSetFieldNode fsfn=new FlatSetFieldNode(dst_tmp, fan.getField(), src_tmp);
335 np_baseexp.getEnd().addNext(fsfn);
336 return new NodePair(np_src.getBegin(), fsfn);
338 if (nn.getField()!=null) {
339 FlatSetFieldNode fsfn=new FlatSetFieldNode(getTempforVar(nn.getVar()), nn.getField(), src_tmp);
341 return new NodePair(np_src.getBegin(), fsfn);
343 FlatOpNode fon=new FlatOpNode(getTempforVar(nn.getVar()), src_tmp, null, new Operation(Operation.ASSIGN));
345 return new NodePair(np_src.getBegin(),fon);
352 private NodePair flattenNameNode(NameNode nn,TempDescriptor out_temp) {
353 if (nn.getExpression()!=null) {
354 /* Hack - use subtree instead */
355 return flattenExpressionNode(nn.getExpression(),out_temp);
356 } else if (nn.getField()!=null) {
357 TempDescriptor tmp=getTempforVar(nn.getVar());
358 FlatFieldNode ffn=new FlatFieldNode(nn.getField(), tmp, out_temp);
359 return new NodePair(ffn,ffn);
361 TempDescriptor tmp=getTempforVar(nn.getVar());
362 FlatOpNode fon=new FlatOpNode(out_temp, tmp, null, new Operation(Operation.ASSIGN));
363 return new NodePair(fon,fon);
367 private NodePair flattenOpNode(OpNode on,TempDescriptor out_temp) {
368 TempDescriptor temp_left=TempDescriptor.tempFactory("leftop",on.getLeft().getType());
369 TempDescriptor temp_right=null;
371 Operation op=on.getOp();
372 if (op.getOp()==Operation.POSTINC||
373 op.getOp()==Operation.POSTDEC||
374 op.getOp()==Operation.PREINC||
375 op.getOp()==Operation.PREDEC) {
376 LiteralNode ln=new LiteralNode("int",new Integer(1));
377 ln.setType(new TypeDescriptor(TypeDescriptor.INT));
378 AssignmentNode an=new AssignmentNode(on.getLeft(),ln,
379 new AssignOperation((op.getOp()==Operation.POSTINC||op.getOp()==Operation.PREINC)?AssignOperation.PLUSEQ:AssignOperation.MINUSEQ));
380 if (op.getOp()==Operation.POSTINC||
381 op.getOp()==Operation.POSTDEC) {
382 NodePair left=flattenExpressionNode(on.getLeft(),out_temp);
383 NodePair assign=flattenAssignmentNode(an,temp_left);
384 left.getEnd().addNext(assign.getBegin());
385 return new NodePair(left.getBegin(),assign.getEnd());
387 NodePair assign=flattenAssignmentNode(an,out_temp);
392 NodePair left=flattenExpressionNode(on.getLeft(),temp_left);
394 if (on.getRight()!=null) {
395 temp_right=TempDescriptor.tempFactory("rightop",on.getRight().getType());
396 right=flattenExpressionNode(on.getRight(),temp_right);
398 FlatNop nop=new FlatNop();
399 right=new NodePair(nop,nop);
402 if (op.getOp()==Operation.LOGIC_OR) {
403 /* Need to do shortcircuiting */
404 FlatCondBranch fcb=new FlatCondBranch(temp_left);
405 FlatOpNode fon1=new FlatOpNode(out_temp,temp_left,null,new Operation(Operation.ASSIGN));
406 FlatOpNode fon2=new FlatOpNode(out_temp,temp_right,null,new Operation(Operation.ASSIGN));
407 FlatNop fnop=new FlatNop();
408 left.getEnd().addNext(fcb);
409 fcb.addFalseNext(right.getBegin());
410 right.getEnd().addNext(fon2);
412 fcb.addTrueNext(fon1);
414 return new NodePair(left.getBegin(), fnop);
415 } else if (op.getOp()==Operation.LOGIC_AND) {
416 /* Need to do shortcircuiting */
417 FlatCondBranch fcb=new FlatCondBranch(temp_left);
418 FlatOpNode fon1=new FlatOpNode(out_temp,temp_left,null,new Operation(Operation.ASSIGN));
419 FlatOpNode fon2=new FlatOpNode(out_temp,temp_right,null,new Operation(Operation.ASSIGN));
420 FlatNop fnop=new FlatNop();
421 left.getEnd().addNext(fcb);
422 fcb.addTrueNext(right.getBegin());
423 right.getEnd().addNext(fon2);
425 fcb.addFalseNext(fon1);
427 return new NodePair(left.getBegin(), fnop);
430 FlatOpNode fon=new FlatOpNode(out_temp,temp_left,temp_right,op);
431 left.getEnd().addNext(right.getBegin());
432 right.getEnd().addNext(fon);
433 return new NodePair(left.getBegin(),fon);
436 private NodePair flattenExpressionNode(ExpressionNode en, TempDescriptor out_temp) {
438 case Kind.AssignmentNode:
439 return flattenAssignmentNode((AssignmentNode)en,out_temp);
441 return flattenCastNode((CastNode)en,out_temp);
442 case Kind.CreateObjectNode:
443 return flattenCreateObjectNode((CreateObjectNode)en,out_temp);
444 case Kind.FieldAccessNode:
445 return flattenFieldAccessNode((FieldAccessNode)en,out_temp);
446 case Kind.ArrayAccessNode:
447 return flattenArrayAccessNode((ArrayAccessNode)en,out_temp);
448 case Kind.LiteralNode:
449 return flattenLiteralNode((LiteralNode)en,out_temp);
450 case Kind.MethodInvokeNode:
451 return flattenMethodInvokeNode((MethodInvokeNode)en,out_temp);
453 return flattenNameNode((NameNode)en,out_temp);
455 return flattenOpNode((OpNode)en,out_temp);
460 private NodePair flattenDeclarationNode(DeclarationNode dn) {
461 VarDescriptor vd=dn.getVarDescriptor();
462 TempDescriptor td=getTempforVar(vd);
463 if (dn.getExpression()!=null)
464 return flattenExpressionNode(dn.getExpression(),td);
466 FlatNop fn=new FlatNop();
467 return new NodePair(fn,fn);
471 private TempDescriptor getTempforVar(VarDescriptor vd) {
472 if (temptovar.containsKey(vd))
473 return (TempDescriptor)temptovar.get(vd);
475 TempDescriptor td=TempDescriptor.tempFactory(vd.getName(),vd.getType());
476 temptovar.put(vd,td);
481 private NodePair flattenIfStatementNode(IfStatementNode isn) {
482 TempDescriptor cond_temp=TempDescriptor.tempFactory("condition",new TypeDescriptor(TypeDescriptor.BOOLEAN));
483 NodePair cond=flattenExpressionNode(isn.getCondition(),cond_temp);
484 FlatCondBranch fcb=new FlatCondBranch(cond_temp);
485 NodePair true_np=flattenBlockNode(isn.getTrueBlock());
487 FlatNop nopend=new FlatNop();
489 if (isn.getFalseBlock()!=null)
490 false_np=flattenBlockNode(isn.getFalseBlock());
492 FlatNop nop=new FlatNop();
493 false_np=new NodePair(nop,nop);
496 cond.getEnd().addNext(fcb);
497 fcb.addTrueNext(true_np.getBegin());
498 fcb.addFalseNext(false_np.getBegin());
499 true_np.getEnd().addNext(nopend);
500 false_np.getEnd().addNext(nopend);
501 return new NodePair(cond.getBegin(), nopend);
504 private NodePair flattenLoopNode(LoopNode ln) {
505 if (ln.getType()==LoopNode.FORLOOP) {
506 NodePair initializer=flattenBlockNode(ln.getInitializer());
507 TempDescriptor cond_temp=TempDescriptor.tempFactory("condition", new TypeDescriptor(TypeDescriptor.BOOLEAN));
508 NodePair condition=flattenExpressionNode(ln.getCondition(),cond_temp);
509 NodePair update=flattenBlockNode(ln.getUpdate());
510 NodePair body=flattenBlockNode(ln.getBody());
511 FlatNode begin=initializer.getBegin();
512 FlatCondBranch fcb=new FlatCondBranch(cond_temp);
513 FlatNop nopend=new FlatNop();
515 initializer.getEnd().addNext(condition.getBegin());
516 body.getEnd().addNext(update.getBegin());
517 update.getEnd().addNext(condition.getBegin());
518 condition.getEnd().addNext(fcb);
519 fcb.addFalseNext(nopend);
520 fcb.addTrueNext(body.getBegin());
521 return new NodePair(begin,nopend);
522 } else if (ln.getType()==LoopNode.WHILELOOP) {
523 TempDescriptor cond_temp=TempDescriptor.tempFactory("condition", new TypeDescriptor(TypeDescriptor.BOOLEAN));
524 NodePair condition=flattenExpressionNode(ln.getCondition(),cond_temp);
525 NodePair body=flattenBlockNode(ln.getBody());
526 FlatNode begin=condition.getBegin();
527 FlatCondBranch fcb=new FlatCondBranch(cond_temp);
528 FlatNop nopend=new FlatNop();
530 body.getEnd().addNext(condition.getBegin());
531 condition.getEnd().addNext(fcb);
532 fcb.addFalseNext(nopend);
533 fcb.addTrueNext(body.getBegin());
534 return new NodePair(begin,nopend);
535 } else if (ln.getType()==LoopNode.DOWHILELOOP) {
536 TempDescriptor cond_temp=TempDescriptor.tempFactory("condition", new TypeDescriptor(TypeDescriptor.BOOLEAN));
537 NodePair condition=flattenExpressionNode(ln.getCondition(),cond_temp);
538 NodePair body=flattenBlockNode(ln.getBody());
539 FlatNode begin=body.getBegin();
540 FlatCondBranch fcb=new FlatCondBranch(cond_temp);
541 FlatNop nopend=new FlatNop();
543 body.getEnd().addNext(condition.getBegin());
544 condition.getEnd().addNext(fcb);
545 fcb.addFalseNext(nopend);
546 fcb.addTrueNext(body.getBegin());
547 return new NodePair(begin,nopend);
548 } else throw new Error();
551 private NodePair flattenReturnNode(ReturnNode rntree) {
552 TempDescriptor retval=null;
554 if (rntree.getReturnExpression()!=null) {
555 retval=TempDescriptor.tempFactory("ret_value", rntree.getReturnExpression().getType());
556 cond=flattenExpressionNode(rntree.getReturnExpression(),retval);
559 FlatReturnNode rnflat=new FlatReturnNode(retval);
562 cond.getEnd().addNext(rnflat);
563 return new NodePair(cond.getBegin(),rnflat);
565 return new NodePair(rnflat,rnflat);
568 private NodePair flattenTaskExitNode(TaskExitNode ten) {
569 FlatFlagActionNode ffan=new FlatFlagActionNode(true);
570 updateFlagActionNode(ffan, ten.getFlagEffects());
571 return new NodePair(ffan, ffan);
574 private NodePair flattenSubBlockNode(SubBlockNode sbn) {
575 return flattenBlockNode(sbn.getBlockNode());
578 private NodePair flattenBlockStatementNode(BlockStatementNode bsn) {
580 case Kind.BlockExpressionNode:
581 return flattenBlockExpressionNode((BlockExpressionNode)bsn);
583 case Kind.DeclarationNode:
584 return flattenDeclarationNode((DeclarationNode)bsn);
586 case Kind.IfStatementNode:
587 return flattenIfStatementNode((IfStatementNode)bsn);
590 return flattenLoopNode((LoopNode)bsn);
592 case Kind.ReturnNode:
593 return flattenReturnNode((IR.Tree.ReturnNode)bsn);
595 case Kind.TaskExitNode:
596 return flattenTaskExitNode((IR.Tree.TaskExitNode)bsn);
598 case Kind.SubBlockNode:
599 return flattenSubBlockNode((SubBlockNode)bsn);