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();
27 private void flattenClass(ClassDescriptor cn) {
28 Iterator methodit=cn.getMethods();
29 while(methodit.hasNext()) {
30 MethodDescriptor md=(MethodDescriptor)methodit.next();
31 BlockNode bn=state.getMethodBody(md);
32 FlatNode fn=flattenBlockNode(bn).getBegin();
33 FlatMethod fm=new FlatMethod(md, fn);
35 fm.addParameterTemp(getTempforVar(md.getThis()));
36 for(int i=0;i<md.numParameters();i++) {
37 fm.addParameterTemp(getTempforVar(md.getParameter(i)));
39 System.out.println(fm.printMethod());
40 state.addFlatCode(md,fm);
44 private NodePair flattenBlockNode(BlockNode bn) {
47 for(int i=0;i<bn.size();i++) {
48 NodePair np=flattenBlockStatementNode(bn.get(i));
49 FlatNode np_begin=np.getBegin();
50 FlatNode np_end=np.getEnd();
57 end.addNext(np_begin);
62 end=begin=new FlatNop();
64 return new NodePair(begin,end);
67 private NodePair flattenBlockExpressionNode(BlockExpressionNode en) {
68 TempDescriptor tmp=TempDescriptor.tempFactory("neverused",en.getExpression().getType());
69 return flattenExpressionNode(en.getExpression(),tmp);
72 private NodePair flattenCastNode(CastNode cn,TempDescriptor out_temp) {
73 TempDescriptor tmp=TempDescriptor.tempFactory("tocast",cn.getExpression().getType());
74 NodePair np=flattenExpressionNode(cn.getExpression(), tmp);
75 FlatCastNode fcn=new FlatCastNode(cn.getType(), tmp, out_temp);
76 np.getEnd().addNext(fcn);
77 return new NodePair(np.getBegin(),fcn);
80 private NodePair flattenLiteralNode(LiteralNode ln,TempDescriptor out_temp) {
81 FlatLiteralNode fln=new FlatLiteralNode(ln.getType(), ln.getValue(), out_temp);
82 return new NodePair(fln,fln);
85 private NodePair flattenCreateObjectNode(CreateObjectNode con,TempDescriptor out_temp) {
86 TypeDescriptor td=con.getType();
87 FlatNew fn=new FlatNew(td, out_temp);
88 TempDescriptor[] temps=new TempDescriptor[con.numArgs()];
91 for(int i=0;i<con.numArgs();i++) {
92 ExpressionNode en=con.getArg(i);
93 TempDescriptor tmp=TempDescriptor.tempFactory("arg",en.getType());
95 NodePair np=flattenExpressionNode(en, tmp);
96 last.addNext(np.getBegin());
99 MethodDescriptor md=con.getConstructor();
100 //Call to constructor
101 FlatCall fc=new FlatCall(md, null, out_temp, temps);
103 return new NodePair(fn,fc);
106 private NodePair flattenMethodInvokeNode(MethodInvokeNode min,TempDescriptor out_temp) {
107 TempDescriptor[] temps=new TempDescriptor[min.numArgs()];
110 TempDescriptor thisarg=null;
112 if (min.getExpression()!=null) {
113 thisarg=TempDescriptor.tempFactory("thisarg",min.getExpression().getType());
114 NodePair np=flattenExpressionNode(min.getExpression(),thisarg);
120 for(int i=0;i<min.numArgs();i++) {
121 ExpressionNode en=min.getArg(i);
122 TempDescriptor td=TempDescriptor.tempFactory("arg",en.getType());
124 NodePair np=flattenExpressionNode(en, td);
128 last.addNext(np.getBegin());
132 MethodDescriptor md=min.getMethod();
134 //Call to constructor
137 if(md.getReturnType()==null||md.getReturnType().isVoid())
138 fc=new FlatCall(md, null, thisarg, temps);
140 fc=new FlatCall(md, out_temp, thisarg, temps);
145 return new NodePair(first,fc);
148 private NodePair flattenFieldAccessNode(FieldAccessNode fan,TempDescriptor out_temp) {
149 TempDescriptor tmp=TempDescriptor.tempFactory("temp",fan.getExpression().getType());
150 NodePair npe=flattenExpressionNode(fan.getExpression(),tmp);
151 FlatFieldNode fn=new FlatFieldNode(fan.getField(),tmp,out_temp);
152 npe.getEnd().addNext(fn);
153 return new NodePair(npe.getBegin(),fn);
156 private NodePair flattenAssignmentNode(AssignmentNode an,TempDescriptor out_temp) {
158 // left side is variable
159 // left side is field
161 Operation base=an.getOperation().getBaseOp();
162 TempDescriptor src_tmp=TempDescriptor.tempFactory("src",an.getSrc().getType());
163 NodePair np_src=flattenExpressionNode(an.getSrc(),src_tmp);
164 FlatNode last=np_src.getEnd();
166 TempDescriptor src_tmp2=TempDescriptor.tempFactory("tmp", an.getDest().getType());
167 NodePair np_dst_init=flattenExpressionNode(an.getDest(),src_tmp2);
168 last.addNext(np_dst_init.getBegin());
169 TempDescriptor dst_tmp=TempDescriptor.tempFactory("dst_tmp",an.getDest().getType());
170 FlatOpNode fon=new FlatOpNode(dst_tmp, src_tmp,src_tmp2, base);
171 np_dst_init.getEnd().addNext(fon);
176 if (an.getDest().kind()==Kind.FieldAccessNode) {
177 FieldAccessNode fan=(FieldAccessNode)an.getDest();
178 ExpressionNode en=fan.getExpression();
179 TempDescriptor dst_tmp=TempDescriptor.tempFactory("dst",en.getType());
180 NodePair np_baseexp=flattenExpressionNode(en, dst_tmp);
181 last.addNext(np_baseexp.getBegin());
182 FlatSetFieldNode fsfn=new FlatSetFieldNode(dst_tmp, fan.getField(), src_tmp);
183 np_baseexp.getEnd().addNext(fsfn);
184 return new NodePair(np_src.getBegin(), fsfn);
185 } else if (an.getDest().kind()==Kind.NameNode) {
186 NameNode nn=(NameNode)an.getDest();
187 if (nn.getExpression()!=null) {
188 FieldAccessNode fan=(FieldAccessNode)nn.getExpression();
189 ExpressionNode en=fan.getExpression();
190 TempDescriptor dst_tmp=TempDescriptor.tempFactory("dst",en.getType());
191 NodePair np_baseexp=flattenExpressionNode(en, dst_tmp);
192 last.addNext(np_baseexp.getBegin());
193 FlatSetFieldNode fsfn=new FlatSetFieldNode(dst_tmp, fan.getField(), src_tmp);
194 np_baseexp.getEnd().addNext(fsfn);
195 return new NodePair(np_src.getBegin(), fsfn);
197 if (nn.getField()!=null) {
198 FlatSetFieldNode fsfn=new FlatSetFieldNode(getTempforVar(nn.getVar()), nn.getField(), src_tmp);
200 return new NodePair(np_src.getBegin(), fsfn);
202 FlatOpNode fon=new FlatOpNode(getTempforVar(nn.getVar()), src_tmp, null, new Operation(Operation.ASSIGN));
204 return new NodePair(np_src.getBegin(),fon);
211 private NodePair flattenNameNode(NameNode nn,TempDescriptor out_temp) {
212 if (nn.getExpression()!=null) {
213 /* Hack - use subtree instead */
214 return flattenExpressionNode(nn.getExpression(),out_temp);
215 } else if (nn.getField()!=null) {
216 TempDescriptor tmp=getTempforVar(nn.getVar());
217 FlatFieldNode ffn=new FlatFieldNode(nn.getField(), tmp, out_temp);
218 return new NodePair(ffn,ffn);
220 TempDescriptor tmp=getTempforVar(nn.getVar());
221 FlatOpNode fon=new FlatOpNode(out_temp, tmp, null, new Operation(Operation.ASSIGN));
222 return new NodePair(fon,fon);
226 private NodePair flattenOpNode(OpNode on,TempDescriptor out_temp) {
227 TempDescriptor temp_left=TempDescriptor.tempFactory("leftop",on.getLeft().getType());
228 TempDescriptor temp_right=null;
230 NodePair left=flattenExpressionNode(on.getLeft(),temp_left);
232 if (on.getRight()!=null) {
233 temp_right=TempDescriptor.tempFactory("rightop",on.getRight().getType());
234 right=flattenExpressionNode(on.getRight(),temp_right);
236 FlatNop nop=new FlatNop();
237 right=new NodePair(nop,nop);
239 Operation op=on.getOp();
240 FlatOpNode fon=new FlatOpNode(out_temp,temp_left,temp_right,op);
241 left.getEnd().addNext(right.getBegin());
242 right.getEnd().addNext(fon);
243 return new NodePair(left.getBegin(),fon);
246 private NodePair flattenExpressionNode(ExpressionNode en, TempDescriptor out_temp) {
248 case Kind.AssignmentNode:
249 return flattenAssignmentNode((AssignmentNode)en,out_temp);
251 return flattenCastNode((CastNode)en,out_temp);
252 case Kind.CreateObjectNode:
253 return flattenCreateObjectNode((CreateObjectNode)en,out_temp);
254 case Kind.FieldAccessNode:
255 return flattenFieldAccessNode((FieldAccessNode)en,out_temp);
256 case Kind.LiteralNode:
257 return flattenLiteralNode((LiteralNode)en,out_temp);
258 case Kind.MethodInvokeNode:
259 return flattenMethodInvokeNode((MethodInvokeNode)en,out_temp);
261 return flattenNameNode((NameNode)en,out_temp);
263 return flattenOpNode((OpNode)en,out_temp);
268 private NodePair flattenDeclarationNode(DeclarationNode dn) {
269 VarDescriptor vd=dn.getVarDescriptor();
270 TempDescriptor td=getTempforVar(vd);
271 if (dn.getExpression()!=null)
272 return flattenExpressionNode(dn.getExpression(),td);
274 FlatNop fn=new FlatNop();
275 return new NodePair(fn,fn);
279 private TempDescriptor getTempforVar(VarDescriptor vd) {
280 if (temptovar.containsKey(vd))
281 return (TempDescriptor)temptovar.get(vd);
283 TempDescriptor td=TempDescriptor.tempFactory(vd.getName(),vd.getType());
284 temptovar.put(vd,td);
289 private NodePair flattenIfStatementNode(IfStatementNode isn) {
290 TempDescriptor cond_temp=TempDescriptor.tempFactory("condition",new TypeDescriptor(TypeDescriptor.BOOLEAN));
291 NodePair cond=flattenExpressionNode(isn.getCondition(),cond_temp);
292 FlatCondBranch fcb=new FlatCondBranch(cond_temp);
293 NodePair true_np=flattenBlockNode(isn.getTrueBlock());
295 FlatNop nopend=new FlatNop();
297 if (isn.getFalseBlock()!=null)
298 false_np=flattenBlockNode(isn.getFalseBlock());
300 FlatNop nop=new FlatNop();
301 false_np=new NodePair(nop,nop);
304 cond.getEnd().addNext(fcb);
305 fcb.addTrueNext(true_np.getBegin());
306 fcb.addFalseNext(false_np.getBegin());
307 true_np.getEnd().addNext(nopend);
308 false_np.getEnd().addNext(nopend);
309 return new NodePair(cond.getBegin(), nopend);
312 private NodePair flattenLoopNode(LoopNode ln) {
313 if (ln.getType()==LoopNode.FORLOOP) {
314 NodePair initializer=flattenBlockNode(ln.getInitializer());
315 TempDescriptor cond_temp=TempDescriptor.tempFactory("condition", new TypeDescriptor(TypeDescriptor.BOOLEAN));
316 NodePair condition=flattenExpressionNode(ln.getCondition(),cond_temp);
317 NodePair update=flattenBlockNode(ln.getUpdate());
318 NodePair body=flattenBlockNode(ln.getBody());
319 FlatNode begin=initializer.getBegin();
320 FlatCondBranch fcb=new FlatCondBranch(cond_temp);
321 FlatNop nopend=new FlatNop();
323 initializer.getEnd().addNext(condition.getBegin());
324 body.getEnd().addNext(update.getBegin());
325 update.getEnd().addNext(condition.getBegin());
326 condition.getEnd().addNext(fcb);
327 fcb.addFalseNext(nopend);
328 fcb.addTrueNext(body.getBegin());
329 return new NodePair(begin,nopend);
330 } else if (ln.getType()==LoopNode.WHILELOOP) {
331 TempDescriptor cond_temp=TempDescriptor.tempFactory("condition", new TypeDescriptor(TypeDescriptor.BOOLEAN));
332 NodePair condition=flattenExpressionNode(ln.getCondition(),cond_temp);
333 NodePair body=flattenBlockNode(ln.getBody());
334 FlatNode begin=condition.getBegin();
335 FlatCondBranch fcb=new FlatCondBranch(cond_temp);
336 FlatNop nopend=new FlatNop();
338 body.getEnd().addNext(condition.getBegin());
339 condition.getEnd().addNext(fcb);
340 fcb.addFalseNext(nopend);
341 fcb.addTrueNext(body.getBegin());
342 return new NodePair(begin,nopend);
343 } else if (ln.getType()==LoopNode.DOWHILELOOP) {
344 TempDescriptor cond_temp=TempDescriptor.tempFactory("condition", new TypeDescriptor(TypeDescriptor.BOOLEAN));
345 NodePair condition=flattenExpressionNode(ln.getCondition(),cond_temp);
346 NodePair body=flattenBlockNode(ln.getBody());
347 FlatNode begin=body.getBegin();
348 FlatCondBranch fcb=new FlatCondBranch(cond_temp);
349 FlatNop nopend=new FlatNop();
351 body.getEnd().addNext(condition.getBegin());
352 condition.getEnd().addNext(fcb);
353 fcb.addFalseNext(nopend);
354 fcb.addTrueNext(body.getBegin());
355 return new NodePair(begin,nopend);
356 } else throw new Error();
359 private NodePair flattenReturnNode(ReturnNode rntree) {
360 TempDescriptor retval=TempDescriptor.tempFactory("ret_value", rntree.getReturnExpression().getType());
361 NodePair cond=flattenExpressionNode(rntree.getReturnExpression(),retval);
362 FlatReturnNode rnflat=new FlatReturnNode(retval);
363 cond.getEnd().addNext(rnflat);
364 return new NodePair(cond.getBegin(),rnflat);
367 private NodePair flattenSubBlockNode(SubBlockNode sbn) {
368 return flattenBlockNode(sbn.getBlockNode());
371 private NodePair flattenBlockStatementNode(BlockStatementNode bsn) {
373 case Kind.BlockExpressionNode:
374 return flattenBlockExpressionNode((BlockExpressionNode)bsn);
376 case Kind.DeclarationNode:
377 return flattenDeclarationNode((DeclarationNode)bsn);
379 case Kind.IfStatementNode:
380 return flattenIfStatementNode((IfStatementNode)bsn);
383 return flattenLoopNode((LoopNode)bsn);
385 case Kind.ReturnNode:
386 return flattenReturnNode((IR.Tree.ReturnNode)bsn);
388 case Kind.SubBlockNode:
389 return flattenSubBlockNode((SubBlockNode)bsn);