1 package Analysis.SSJava;
3 import java.util.ArrayList;
4 import java.util.Collections;
5 import java.util.Comparator;
6 import java.util.HashSet;
7 import java.util.Hashtable;
8 import java.util.Iterator;
11 import java.util.StringTokenizer;
12 import java.util.Vector;
14 import Analysis.SSJava.FlowDownCheck.ComparisonResult;
15 import Analysis.SSJava.FlowDownCheck.CompositeLattice;
16 import IR.AnnotationDescriptor;
17 import IR.ClassDescriptor;
19 import IR.FieldDescriptor;
20 import IR.MethodDescriptor;
21 import IR.NameDescriptor;
24 import IR.SymbolTable;
25 import IR.TypeDescriptor;
26 import IR.TypeExtension;
27 import IR.VarDescriptor;
28 import IR.Flat.FlatNode;
29 import IR.Tree.ArrayAccessNode;
30 import IR.Tree.AssignmentNode;
31 import IR.Tree.BlockExpressionNode;
32 import IR.Tree.BlockNode;
33 import IR.Tree.BlockStatementNode;
34 import IR.Tree.CastNode;
35 import IR.Tree.CreateObjectNode;
36 import IR.Tree.DeclarationNode;
37 import IR.Tree.ExpressionNode;
38 import IR.Tree.FieldAccessNode;
39 import IR.Tree.IfStatementNode;
41 import IR.Tree.LiteralNode;
42 import IR.Tree.LoopNode;
43 import IR.Tree.MethodInvokeNode;
44 import IR.Tree.NameNode;
45 import IR.Tree.OpNode;
46 import IR.Tree.ReturnNode;
47 import IR.Tree.SubBlockNode;
48 import IR.Tree.SwitchBlockNode;
49 import IR.Tree.SwitchStatementNode;
50 import IR.Tree.SynchronizedNode;
51 import IR.Tree.TertiaryNode;
52 import IR.Tree.TreeNode;
55 public class FlowDownCheck {
58 static SSJavaAnalysis ssjava;
60 Set<ClassDescriptor> toanalyze;
61 List<ClassDescriptor> toanalyzeList;
63 Set<MethodDescriptor> toanalyzeMethod;
64 List<MethodDescriptor> toanalyzeMethodList;
66 // mapping from 'descriptor' to 'composite location'
67 Hashtable<Descriptor, CompositeLocation> d2loc;
69 Hashtable<MethodDescriptor, CompositeLocation> md2ReturnLoc;
70 Hashtable<MethodDescriptor, ReturnLocGenerator> md2ReturnLocGen;
72 // mapping from 'locID' to 'class descriptor'
73 Hashtable<String, ClassDescriptor> fieldLocName2cd;
75 boolean deterministic = true;
77 public FlowDownCheck(SSJavaAnalysis ssjava, State state) {
81 this.toanalyzeList = new ArrayList<ClassDescriptor>();
83 this.toanalyze = new HashSet<ClassDescriptor>();
86 this.toanalyzeMethodList = new ArrayList<MethodDescriptor>();
88 this.toanalyzeMethod = new HashSet<MethodDescriptor>();
90 this.d2loc = new Hashtable<Descriptor, CompositeLocation>();
91 this.fieldLocName2cd = new Hashtable<String, ClassDescriptor>();
92 this.md2ReturnLoc = new Hashtable<MethodDescriptor, CompositeLocation>();
93 this.md2ReturnLocGen = new Hashtable<MethodDescriptor, ReturnLocGenerator>();
98 // construct mapping from the location name to the class descriptor
99 // assume that the location name is unique through the whole program
101 Set<ClassDescriptor> cdSet = ssjava.getCd2lattice().keySet();
102 for (Iterator iterator = cdSet.iterator(); iterator.hasNext();) {
103 ClassDescriptor cd = (ClassDescriptor) iterator.next();
104 SSJavaLattice<String> lattice = ssjava.getCd2lattice().get(cd);
105 Set<String> fieldLocNameSet = lattice.getKeySet();
107 for (Iterator iterator2 = fieldLocNameSet.iterator(); iterator2.hasNext();) {
108 String fieldLocName = (String) iterator2.next();
109 fieldLocName2cd.put(fieldLocName, cd);
116 public boolean toAnalyzeIsEmpty() {
118 return toanalyzeList.isEmpty();
120 return toanalyze.isEmpty();
124 public ClassDescriptor toAnalyzeNext() {
126 return toanalyzeList.remove(0);
128 ClassDescriptor cd = toanalyze.iterator().next();
129 toanalyze.remove(cd);
134 public void setupToAnalyze() {
135 SymbolTable classtable = state.getClassSymbolTable();
137 toanalyzeList.clear();
138 toanalyzeList.addAll(classtable.getValueSet());
139 Collections.sort(toanalyzeList, new Comparator<ClassDescriptor>() {
140 public int compare(ClassDescriptor o1, ClassDescriptor o2) {
141 return o1.getClassName().compareToIgnoreCase(o2.getClassName());
146 toanalyze.addAll(classtable.getValueSet());
150 public void setupToAnalazeMethod(ClassDescriptor cd) {
152 SymbolTable methodtable = cd.getMethodTable();
154 toanalyzeMethodList.clear();
155 toanalyzeMethodList.addAll(methodtable.getValueSet());
156 Collections.sort(toanalyzeMethodList, new Comparator<MethodDescriptor>() {
157 public int compare(MethodDescriptor o1, MethodDescriptor o2) {
158 return o1.getSymbol().compareToIgnoreCase(o2.getSymbol());
162 toanalyzeMethod.clear();
163 toanalyzeMethod.addAll(methodtable.getValueSet());
167 public boolean toAnalyzeMethodIsEmpty() {
169 return toanalyzeMethodList.isEmpty();
171 return toanalyzeMethod.isEmpty();
175 public MethodDescriptor toAnalyzeMethodNext() {
177 return toanalyzeMethodList.remove(0);
179 MethodDescriptor md = toanalyzeMethod.iterator().next();
180 toanalyzeMethod.remove(md);
185 public void flowDownCheck() {
187 // phase 1 : checking declaration node and creating mapping of 'type
188 // desciptor' & 'location'
191 while (!toAnalyzeIsEmpty()) {
192 ClassDescriptor cd = toAnalyzeNext();
194 if (ssjava.needToBeAnnoated(cd)) {
196 ClassDescriptor superDesc = cd.getSuperDesc();
198 if (superDesc != null && (!superDesc.getSymbol().equals("Object"))) {
199 checkOrderingInheritance(superDesc, cd);
202 checkDeclarationInClass(cd);
204 setupToAnalazeMethod(cd);
205 while (!toAnalyzeMethodIsEmpty()) {
206 MethodDescriptor md = toAnalyzeMethodNext();
207 if (ssjava.needTobeAnnotated(md)) {
208 checkDeclarationInMethodBody(cd, md);
216 // phase2 : checking assignments
219 while (!toAnalyzeIsEmpty()) {
220 ClassDescriptor cd = toAnalyzeNext();
222 setupToAnalazeMethod(cd);
223 while (!toAnalyzeMethodIsEmpty()) {
224 MethodDescriptor md = toAnalyzeMethodNext();
225 if (ssjava.needTobeAnnotated(md)) {
226 if (state.SSJAVADEBUG) {
227 System.out.println("SSJAVA: Checking Flow-down Rules: " + md);
229 CompositeLocation calleePCLOC = ssjava.getPCLocation(md);
230 checkMethodBody(cd, md, calleePCLOC);
237 private void checkOrderingInheritance(ClassDescriptor superCd, ClassDescriptor cd) {
238 // here, we're going to check that sub class keeps same relative orderings
239 // in respect to super class
241 SSJavaLattice<String> superLattice = ssjava.getClassLattice(superCd);
242 SSJavaLattice<String> subLattice = ssjava.getClassLattice(cd);
244 if (superLattice != null) {
245 // if super class doesn't define lattice, then we don't need to check its
247 if (subLattice == null) {
248 throw new Error("If a parent class '" + superCd
249 + "' has a ordering lattice, its subclass '" + cd + "' should have one.");
252 Set<Pair<String, String>> superPairSet = superLattice.getOrderingPairSet();
253 Set<Pair<String, String>> subPairSet = subLattice.getOrderingPairSet();
255 for (Iterator iterator = superPairSet.iterator(); iterator.hasNext();) {
256 Pair<String, String> pair = (Pair<String, String>) iterator.next();
258 if (!subPairSet.contains(pair)) {
259 throw new Error("Subclass '" + cd + "' does not have the relative ordering '"
260 + pair.getSecond() + " < " + pair.getFirst()
261 + "' that is defined by its superclass '" + superCd + "'.");
266 MethodLattice<String> superMethodDefaultLattice = ssjava.getMethodDefaultLattice(superCd);
267 MethodLattice<String> subMethodDefaultLattice = ssjava.getMethodDefaultLattice(cd);
269 if (superMethodDefaultLattice != null) {
270 if (subMethodDefaultLattice == null) {
271 throw new Error("When a parent class '" + superCd
272 + "' defines a default method lattice, its subclass '" + cd + "' should define one.");
275 Set<Pair<String, String>> superPairSet = superMethodDefaultLattice.getOrderingPairSet();
276 Set<Pair<String, String>> subPairSet = subMethodDefaultLattice.getOrderingPairSet();
278 for (Iterator iterator = superPairSet.iterator(); iterator.hasNext();) {
279 Pair<String, String> pair = (Pair<String, String>) iterator.next();
281 if (!subPairSet.contains(pair)) {
282 throw new Error("Subclass '" + cd + "' does not have the relative ordering '"
283 + pair.getSecond() + " < " + pair.getFirst()
284 + "' that is defined by its superclass '" + superCd
285 + "' in the method default lattice.");
293 public Hashtable getMap() {
297 private void checkDeclarationInMethodBody(ClassDescriptor cd, MethodDescriptor md) {
298 BlockNode bn = state.getMethodBody(md);
300 // first, check annotations on method parameters
301 List<CompositeLocation> paramList = new ArrayList<CompositeLocation>();
302 for (int i = 0; i < md.numParameters(); i++) {
303 // process annotations on method parameters
304 VarDescriptor vd = (VarDescriptor) md.getParameter(i);
305 assignLocationOfVarDescriptor(vd, md, md.getParameterTable(), null);
306 paramList.add(d2loc.get(vd));
308 Vector<AnnotationDescriptor> methodAnnotations = md.getModifiers().getAnnotations();
310 CompositeLocation returnLocComp = null;
312 boolean hasReturnLocDeclaration = false;
313 if (methodAnnotations != null) {
314 for (int i = 0; i < methodAnnotations.size(); i++) {
315 AnnotationDescriptor an = methodAnnotations.elementAt(i);
316 if (an.getMarker().equals(ssjava.RETURNLOC)) {
317 // this case, developer explicitly defines method lattice
318 String returnLocDeclaration = an.getValue();
319 returnLocComp = parseLocationDeclaration(md, null, returnLocDeclaration);
320 hasReturnLocDeclaration = true;
321 } else if (an.getMarker().equals(ssjava.THISLOC)) {
322 String thisLoc = an.getValue();
323 ssjava.getMethodLattice(md).setThisLoc(thisLoc);
324 } else if (an.getMarker().equals(ssjava.GLOBALLOC)) {
325 String globalLoc = an.getValue();
326 ssjava.getMethodLattice(md).setGlobalLoc(globalLoc);
327 } else if (an.getMarker().equals(ssjava.PCLOC)) {
328 String pcLocDeclaration = an.getValue();
329 ssjava.setPCLocation(md, parseLocationDeclaration(md, null, pcLocDeclaration));
334 // second, check return location annotation
335 if (!md.getReturnType().isVoid()) {
336 if (!hasReturnLocDeclaration) {
337 // if developer does not define method lattice
338 // search return location in the method default lattice
339 String rtrStr = ssjava.getMethodLattice(md).getReturnLoc();
340 if (rtrStr != null) {
341 returnLocComp = new CompositeLocation(new Location(md, rtrStr));
345 if (returnLocComp == null) {
346 throw new Error("Return location is not specified for the method " + md + " at "
347 + cd.getSourceFileName());
350 md2ReturnLoc.put(md, returnLocComp);
354 if (!md.getReturnType().isVoid()) {
355 MethodLattice<String> methodLattice = ssjava.getMethodLattice(md);
356 String thisLocId = methodLattice.getThisLoc();
357 if ((!md.isStatic()) && thisLocId == null) {
358 throw new Error("Method '" + md + "' does not have the definition of 'this' location at "
359 + md.getClassDesc().getSourceFileName());
361 CompositeLocation thisLoc = new CompositeLocation(new Location(md, thisLocId));
362 paramList.add(0, thisLoc);
363 md2ReturnLocGen.put(md, new ReturnLocGenerator(md2ReturnLoc.get(md), md, paramList, md
364 + " of " + cd.getSourceFileName()));
367 // fourth, check declarations inside of method
369 checkDeclarationInBlockNode(md, md.getParameterTable(), bn);
373 private void checkDeclarationInBlockNode(MethodDescriptor md, SymbolTable nametable, BlockNode bn) {
374 bn.getVarTable().setParent(nametable);
375 for (int i = 0; i < bn.size(); i++) {
376 BlockStatementNode bsn = bn.get(i);
377 checkDeclarationInBlockStatementNode(md, bn.getVarTable(), bsn);
381 private void checkDeclarationInBlockStatementNode(MethodDescriptor md, SymbolTable nametable,
382 BlockStatementNode bsn) {
384 switch (bsn.kind()) {
385 case Kind.SubBlockNode:
386 checkDeclarationInSubBlockNode(md, nametable, (SubBlockNode) bsn);
389 case Kind.DeclarationNode:
390 checkDeclarationNode(md, nametable, (DeclarationNode) bsn);
394 checkDeclarationInLoopNode(md, nametable, (LoopNode) bsn);
397 case Kind.IfStatementNode:
398 checkDeclarationInIfStatementNode(md, nametable, (IfStatementNode) bsn);
401 case Kind.SwitchStatementNode:
402 checkDeclarationInSwitchStatementNode(md, nametable, (SwitchStatementNode) bsn);
405 case Kind.SynchronizedNode:
406 checkDeclarationInSynchronizedNode(md, nametable, (SynchronizedNode) bsn);
412 private void checkDeclarationInSynchronizedNode(MethodDescriptor md, SymbolTable nametable,
413 SynchronizedNode sbn) {
414 checkDeclarationInBlockNode(md, nametable, sbn.getBlockNode());
417 private void checkDeclarationInSwitchStatementNode(MethodDescriptor md, SymbolTable nametable,
418 SwitchStatementNode ssn) {
419 BlockNode sbn = ssn.getSwitchBody();
420 for (int i = 0; i < sbn.size(); i++) {
421 SwitchBlockNode node = (SwitchBlockNode) sbn.get(i);
422 checkDeclarationInBlockNode(md, nametable, node.getSwitchBlockStatement());
426 private void checkDeclarationInIfStatementNode(MethodDescriptor md, SymbolTable nametable,
427 IfStatementNode isn) {
428 checkDeclarationInBlockNode(md, nametable, isn.getTrueBlock());
429 if (isn.getFalseBlock() != null)
430 checkDeclarationInBlockNode(md, nametable, isn.getFalseBlock());
433 private void checkDeclarationInLoopNode(MethodDescriptor md, SymbolTable nametable, LoopNode ln) {
435 if (ln.getType() == LoopNode.FORLOOP) {
436 // check for loop case
437 ClassDescriptor cd = md.getClassDesc();
438 BlockNode bn = ln.getInitializer();
439 for (int i = 0; i < bn.size(); i++) {
440 BlockStatementNode bsn = bn.get(i);
441 checkDeclarationInBlockStatementNode(md, nametable, bsn);
446 checkDeclarationInBlockNode(md, nametable, ln.getBody());
449 private void checkMethodBody(ClassDescriptor cd, MethodDescriptor md,
450 CompositeLocation constraints) {
451 BlockNode bn = state.getMethodBody(md);
452 checkLocationFromBlockNode(md, md.getParameterTable(), bn, constraints);
455 private String generateErrorMessage(ClassDescriptor cd, TreeNode tn) {
457 return cd.getSourceFileName() + "::" + tn.getNumLine();
459 return cd.getSourceFileName();
464 private CompositeLocation checkLocationFromBlockNode(MethodDescriptor md, SymbolTable nametable,
465 BlockNode bn, CompositeLocation constraint) {
467 bn.getVarTable().setParent(nametable);
468 for (int i = 0; i < bn.size(); i++) {
469 BlockStatementNode bsn = bn.get(i);
470 checkLocationFromBlockStatementNode(md, bn.getVarTable(), bsn, constraint);
472 return new CompositeLocation();
476 private CompositeLocation checkLocationFromBlockStatementNode(MethodDescriptor md,
477 SymbolTable nametable, BlockStatementNode bsn, CompositeLocation constraint) {
479 CompositeLocation compLoc = null;
480 switch (bsn.kind()) {
481 case Kind.BlockExpressionNode:
483 checkLocationFromBlockExpressionNode(md, nametable, (BlockExpressionNode) bsn, constraint);
486 case Kind.DeclarationNode:
487 compLoc = checkLocationFromDeclarationNode(md, nametable, (DeclarationNode) bsn, constraint);
490 case Kind.IfStatementNode:
491 compLoc = checkLocationFromIfStatementNode(md, nametable, (IfStatementNode) bsn, constraint);
495 compLoc = checkLocationFromLoopNode(md, nametable, (LoopNode) bsn, constraint);
498 case Kind.ReturnNode:
499 compLoc = checkLocationFromReturnNode(md, nametable, (ReturnNode) bsn, constraint);
502 case Kind.SubBlockNode:
503 compLoc = checkLocationFromSubBlockNode(md, nametable, (SubBlockNode) bsn, constraint);
506 case Kind.ContinueBreakNode:
507 compLoc = new CompositeLocation();
510 case Kind.SwitchStatementNode:
512 checkLocationFromSwitchStatementNode(md, nametable, (SwitchStatementNode) bsn, constraint);
518 private CompositeLocation checkLocationFromSwitchStatementNode(MethodDescriptor md,
519 SymbolTable nametable, SwitchStatementNode ssn, CompositeLocation constraint) {
521 ClassDescriptor cd = md.getClassDesc();
522 CompositeLocation condLoc =
523 checkLocationFromExpressionNode(md, nametable, ssn.getCondition(), new CompositeLocation(),
525 BlockNode sbn = ssn.getSwitchBody();
527 constraint = generateNewConstraint(constraint, condLoc);
529 for (int i = 0; i < sbn.size(); i++) {
530 checkLocationFromSwitchBlockNode(md, nametable, (SwitchBlockNode) sbn.get(i), constraint);
532 return new CompositeLocation();
535 private CompositeLocation checkLocationFromSwitchBlockNode(MethodDescriptor md,
536 SymbolTable nametable, SwitchBlockNode sbn, CompositeLocation constraint) {
538 CompositeLocation blockLoc =
539 checkLocationFromBlockNode(md, nametable, sbn.getSwitchBlockStatement(), constraint);
545 private CompositeLocation checkLocationFromReturnNode(MethodDescriptor md, SymbolTable nametable,
546 ReturnNode rn, CompositeLocation constraint) {
548 ExpressionNode returnExp = rn.getReturnExpression();
550 CompositeLocation returnValueLoc;
551 if (returnExp != null) {
553 checkLocationFromExpressionNode(md, nametable, returnExp, new CompositeLocation(),
556 // System.out.println("# RETURN VALUE LOC=" + returnValueLoc +
557 // " with constraint=" + constraint);
559 // TODO: do we need to check here?
560 // if this return statement is inside branch, return value has an implicit
561 // flow from conditional location
562 // if (constraint != null) {
563 // Set<CompositeLocation> inputGLB = new HashSet<CompositeLocation>();
564 // inputGLB.add(returnValueLoc);
565 // inputGLB.add(constraint);
567 // CompositeLattice.calculateGLB(inputGLB,
568 // generateErrorMessage(md.getClassDesc(), rn));
571 // check if return value is equal or higher than RETRUNLOC of method
572 // declaration annotation
573 CompositeLocation declaredReturnLoc = md2ReturnLoc.get(md);
576 CompositeLattice.compare(returnValueLoc, declaredReturnLoc, false,
577 generateErrorMessage(md.getClassDesc(), rn));
579 if (compareResult == ComparisonResult.LESS || compareResult == ComparisonResult.INCOMPARABLE) {
581 "Return value location is not equal or higher than the declaraed return location at "
582 + md.getClassDesc().getSourceFileName() + "::" + rn.getNumLine());
586 return new CompositeLocation();
589 private boolean hasOnlyLiteralValue(ExpressionNode en) {
590 if (en.kind() == Kind.LiteralNode) {
597 private CompositeLocation checkLocationFromLoopNode(MethodDescriptor md, SymbolTable nametable,
598 LoopNode ln, CompositeLocation constraint) {
600 ClassDescriptor cd = md.getClassDesc();
601 if (ln.getType() == LoopNode.WHILELOOP || ln.getType() == LoopNode.DOWHILELOOP) {
603 CompositeLocation condLoc =
604 checkLocationFromExpressionNode(md, nametable, ln.getCondition(),
605 new CompositeLocation(), constraint, false);
606 // addLocationType(ln.getCondition().getType(), (condLoc));
608 constraint = generateNewConstraint(constraint, condLoc);
609 checkLocationFromBlockNode(md, nametable, ln.getBody(), constraint);
611 return new CompositeLocation();
614 // check 'for loop' case
615 BlockNode bn = ln.getInitializer();
616 bn.getVarTable().setParent(nametable);
617 // need to check initialization node
618 // checkLocationFromBlockNode(md, bn.getVarTable(), bn, constraint);
619 for (int i = 0; i < bn.size(); i++) {
620 BlockStatementNode bsn = bn.get(i);
621 checkLocationFromBlockStatementNode(md, bn.getVarTable(), bsn, constraint);
624 // calculate glb location of condition and update statements
625 CompositeLocation condLoc =
626 checkLocationFromExpressionNode(md, bn.getVarTable(), ln.getCondition(),
627 new CompositeLocation(), constraint, false);
628 // addLocationType(ln.getCondition().getType(), condLoc);
630 constraint = generateNewConstraint(constraint, condLoc);
632 checkLocationFromBlockNode(md, bn.getVarTable(), ln.getUpdate(), constraint);
633 checkLocationFromBlockNode(md, bn.getVarTable(), ln.getBody(), constraint);
635 return new CompositeLocation();
641 private CompositeLocation checkLocationFromSubBlockNode(MethodDescriptor md,
642 SymbolTable nametable, SubBlockNode sbn, CompositeLocation constraint) {
643 CompositeLocation compLoc =
644 checkLocationFromBlockNode(md, nametable, sbn.getBlockNode(), constraint);
648 private CompositeLocation generateNewConstraint(CompositeLocation currentCon,
649 CompositeLocation newCon) {
651 if (currentCon == null) {
654 // compute GLB of current constraint and new constraint
655 Set<CompositeLocation> inputSet = new HashSet<CompositeLocation>();
656 inputSet.add(currentCon);
657 inputSet.add(newCon);
658 return CompositeLattice.calculateGLB(inputSet, "");
663 private CompositeLocation checkLocationFromIfStatementNode(MethodDescriptor md,
664 SymbolTable nametable, IfStatementNode isn, CompositeLocation constraint) {
666 CompositeLocation condLoc =
667 checkLocationFromExpressionNode(md, nametable, isn.getCondition(), new CompositeLocation(),
670 // addLocationType(isn.getCondition().getType(), condLoc);
671 constraint = generateNewConstraint(constraint, condLoc);
672 checkLocationFromBlockNode(md, nametable, isn.getTrueBlock(), constraint);
674 if (isn.getFalseBlock() != null) {
675 checkLocationFromBlockNode(md, nametable, isn.getFalseBlock(), constraint);
678 return new CompositeLocation();
681 private void checkOwnership(MethodDescriptor md, TreeNode tn, ExpressionNode srcExpNode) {
683 if (srcExpNode.kind() == Kind.NameNode || srcExpNode.kind() == Kind.FieldAccessNode) {
684 if (srcExpNode.getType().isPtr() && !srcExpNode.getType().isNull()) {
685 // first, check the linear type
686 // RHS reference should be owned by the current method
687 FieldDescriptor fd = getFieldDescriptorFromExpressionNode(srcExpNode);
691 isOwned = ((SSJavaType) srcExpNode.getType().getExtension()).isOwned();
694 isOwned = ssjava.isOwnedByMethod(md, fd);
698 "It is not allowed to create the reference alias from the reference not owned by the method at "
699 + generateErrorMessage(md.getClassDesc(), tn));
707 private CompositeLocation checkLocationFromDeclarationNode(MethodDescriptor md,
708 SymbolTable nametable, DeclarationNode dn, CompositeLocation constraint) {
710 VarDescriptor vd = dn.getVarDescriptor();
712 CompositeLocation destLoc = d2loc.get(vd);
714 if (dn.getExpression() != null) {
716 checkOwnership(md, dn, dn.getExpression());
718 CompositeLocation expressionLoc =
719 checkLocationFromExpressionNode(md, nametable, dn.getExpression(),
720 new CompositeLocation(), constraint, false);
721 // addTypeLocation(dn.getExpression().getType(), expressionLoc);
723 if (expressionLoc != null) {
725 // checking location order
726 if (!CompositeLattice.isGreaterThan(expressionLoc, destLoc,
727 generateErrorMessage(md.getClassDesc(), dn))) {
728 throw new Error("The value flow from " + expressionLoc + " to " + destLoc
729 + " does not respect location hierarchy on the assignment " + dn.printNode(0)
730 + " at " + md.getClassDesc().getSourceFileName() + "::" + dn.getNumLine());
733 return expressionLoc;
737 return new CompositeLocation();
743 private void checkDeclarationInSubBlockNode(MethodDescriptor md, SymbolTable nametable,
745 checkDeclarationInBlockNode(md, nametable, sbn.getBlockNode());
748 private CompositeLocation checkLocationFromBlockExpressionNode(MethodDescriptor md,
749 SymbolTable nametable, BlockExpressionNode ben, CompositeLocation constraint) {
751 CompositeLocation compLoc =
752 checkLocationFromExpressionNode(md, nametable, ben.getExpression(), null, constraint, false);
753 // addTypeLocation(ben.getExpression().getType(), compLoc);
757 private CompositeLocation checkLocationFromExpressionNode(MethodDescriptor md,
758 SymbolTable nametable, ExpressionNode en, CompositeLocation loc,
759 CompositeLocation constraint, boolean isLHS) {
761 CompositeLocation compLoc = null;
764 case Kind.AssignmentNode:
766 checkLocationFromAssignmentNode(md, nametable, (AssignmentNode) en, loc, constraint);
769 case Kind.FieldAccessNode:
771 checkLocationFromFieldAccessNode(md, nametable, (FieldAccessNode) en, loc, constraint);
775 compLoc = checkLocationFromNameNode(md, nametable, (NameNode) en, loc, constraint);
779 compLoc = checkLocationFromOpNode(md, nametable, (OpNode) en, constraint);
782 case Kind.CreateObjectNode:
783 compLoc = checkLocationFromCreateObjectNode(md, nametable, (CreateObjectNode) en);
786 case Kind.ArrayAccessNode:
788 checkLocationFromArrayAccessNode(md, nametable, (ArrayAccessNode) en, constraint, isLHS);
791 case Kind.LiteralNode:
792 compLoc = checkLocationFromLiteralNode(md, nametable, (LiteralNode) en, loc);
795 case Kind.MethodInvokeNode:
797 checkLocationFromMethodInvokeNode(md, nametable, (MethodInvokeNode) en, loc, constraint);
800 case Kind.TertiaryNode:
801 compLoc = checkLocationFromTertiaryNode(md, nametable, (TertiaryNode) en, constraint);
805 compLoc = checkLocationFromCastNode(md, nametable, (CastNode) en, constraint);
808 // case Kind.InstanceOfNode:
809 // checkInstanceOfNode(md, nametable, (InstanceOfNode) en, td);
812 // case Kind.ArrayInitializerNode:
813 // checkArrayInitializerNode(md, nametable, (ArrayInitializerNode) en,
817 // case Kind.ClassTypeNode:
818 // checkClassTypeNode(md, nametable, (ClassTypeNode) en, td);
821 // case Kind.OffsetNode:
822 // checkOffsetNode(md, nametable, (OffsetNode)en, td);
829 // addTypeLocation(en.getType(), compLoc);
834 private CompositeLocation checkLocationFromCastNode(MethodDescriptor md, SymbolTable nametable,
835 CastNode cn, CompositeLocation constraint) {
837 ExpressionNode en = cn.getExpression();
838 return checkLocationFromExpressionNode(md, nametable, en, new CompositeLocation(), constraint,
843 private CompositeLocation checkLocationFromTertiaryNode(MethodDescriptor md,
844 SymbolTable nametable, TertiaryNode tn, CompositeLocation constraint) {
845 ClassDescriptor cd = md.getClassDesc();
847 CompositeLocation condLoc =
848 checkLocationFromExpressionNode(md, nametable, tn.getCond(), new CompositeLocation(),
850 // addLocationType(tn.getCond().getType(), condLoc);
851 CompositeLocation trueLoc =
852 checkLocationFromExpressionNode(md, nametable, tn.getTrueExpr(), new CompositeLocation(),
854 // addLocationType(tn.getTrueExpr().getType(), trueLoc);
855 CompositeLocation falseLoc =
856 checkLocationFromExpressionNode(md, nametable, tn.getFalseExpr(), new CompositeLocation(),
858 // addLocationType(tn.getFalseExpr().getType(), falseLoc);
860 // locations from true/false branches can be TOP when there are only literal
862 // in this case, we don't need to check flow down rule!
864 // System.out.println("\n#tertiary cond=" + tn.getCond().printNode(0) +
865 // " Loc=" + condLoc);
866 // System.out.println("# true=" + tn.getTrueExpr().printNode(0) + " Loc=" +
868 // System.out.println("# false=" + tn.getFalseExpr().printNode(0) + " Loc="
871 // check if condLoc is higher than trueLoc & falseLoc
872 if (!trueLoc.get(0).isTop()
873 && !CompositeLattice.isGreaterThan(condLoc, trueLoc, generateErrorMessage(cd, tn))) {
875 "The location of the condition expression is lower than the true expression at "
876 + cd.getSourceFileName() + ":" + tn.getCond().getNumLine());
879 if (!falseLoc.get(0).isTop()
880 && !CompositeLattice.isGreaterThan(condLoc, falseLoc,
881 generateErrorMessage(cd, tn.getCond()))) {
883 "The location of the condition expression is lower than the false expression at "
884 + cd.getSourceFileName() + ":" + tn.getCond().getNumLine());
887 // then, return glb of trueLoc & falseLoc
888 Set<CompositeLocation> glbInputSet = new HashSet<CompositeLocation>();
889 glbInputSet.add(trueLoc);
890 glbInputSet.add(falseLoc);
892 if (glbInputSet.size() == 1) {
895 return CompositeLattice.calculateGLB(glbInputSet, generateErrorMessage(cd, tn));
900 private CompositeLocation checkLocationFromMethodInvokeNode(MethodDescriptor md,
901 SymbolTable nametable, MethodInvokeNode min, CompositeLocation loc,
902 CompositeLocation constraint) {
904 ClassDescriptor cd = md.getClassDesc();
905 MethodDescriptor calleeMethodDesc = min.getMethod();
907 NameDescriptor baseName = min.getBaseName();
908 boolean isSystemout = false;
909 if (baseName != null) {
910 isSystemout = baseName.getSymbol().equals("System.out");
913 if (!ssjava.isSSJavaUtil(calleeMethodDesc.getClassDesc())
914 && !ssjava.isTrustMethod(calleeMethodDesc) && !calleeMethodDesc.getModifiers().isNative()
917 CompositeLocation baseLocation = null;
918 if (min.getExpression() != null) {
920 checkLocationFromExpressionNode(md, nametable, min.getExpression(),
921 new CompositeLocation(), constraint, false);
923 if (min.getMethod().isStatic()) {
924 String globalLocId = ssjava.getMethodLattice(md).getGlobalLoc();
925 if (globalLocId == null) {
926 throw new Error("Method lattice does not define global variable location at "
927 + generateErrorMessage(md.getClassDesc(), min));
929 baseLocation = new CompositeLocation(new Location(md, globalLocId));
931 String thisLocId = ssjava.getMethodLattice(md).getThisLoc();
932 baseLocation = new CompositeLocation(new Location(md, thisLocId));
936 // System.out.println("\n#checkLocationFromMethodInvokeNode=" +
938 // + " baseLocation=" + baseLocation + " constraint=" + constraint);
940 // setup the location list of caller's arguments
941 List<CompositeLocation> callerArgList = new ArrayList<CompositeLocation>();
943 // setup the location list of callee's parameters
944 MethodLattice<String> calleeLattice = ssjava.getMethodLattice(calleeMethodDesc);
945 List<CompositeLocation> calleeParamList = new ArrayList<CompositeLocation>();
947 if (min.numArgs() > 0) {
948 if (!calleeMethodDesc.isStatic()) {
949 callerArgList.add(baseLocation);
951 for (int i = 0; i < min.numArgs(); i++) {
952 ExpressionNode en = min.getArg(i);
953 CompositeLocation callerArgLoc =
954 checkLocationFromExpressionNode(md, nametable, en, new CompositeLocation(),
956 callerArgList.add(callerArgLoc);
959 if (!calleeMethodDesc.isStatic()) {
960 CompositeLocation calleeThisLoc =
961 new CompositeLocation(new Location(calleeMethodDesc, calleeLattice.getThisLoc()));
962 calleeParamList.add(calleeThisLoc);
965 for (int i = 0; i < calleeMethodDesc.numParameters(); i++) {
966 VarDescriptor calleevd = (VarDescriptor) calleeMethodDesc.getParameter(i);
967 CompositeLocation calleeLoc = d2loc.get(calleevd);
968 calleeParamList.add(calleeLoc);
972 if (constraint != null) {
973 // check whether the PC location is lower than one of the
974 // argument locations. If it is lower, the callee has to have @PCLOC
975 // annotation that declares the program counter that is higher than
976 // corresponding parameter
978 CompositeLocation calleePCLOC = ssjava.getPCLocation(calleeMethodDesc);
980 for (int idx = 0; idx < callerArgList.size(); idx++) {
981 CompositeLocation argLocation = callerArgList.get(idx);
983 // need to check that param is higher than PCLOC
984 if (!argLocation.get(0).isTop()
985 && CompositeLattice.compare(argLocation, constraint, true,
986 generateErrorMessage(cd, min)) == ComparisonResult.GREATER) {
988 CompositeLocation paramLocation = calleeParamList.get(idx);
990 int paramCompareResult =
991 CompositeLattice.compare(calleePCLOC, paramLocation, true,
992 generateErrorMessage(cd, min));
994 if (paramCompareResult == ComparisonResult.GREATER) {
996 "The program counter location "
998 + " is lower than the argument(idx="
1002 + ". Need to specify that the initial PC location of the callee, which is currently set to "
1003 + calleePCLOC + ", is lower than " + paramLocation + " in the method "
1004 + calleeMethodDesc.getSymbol() + ":" + min.getNumLine());
1013 checkCalleeConstraints(md, nametable, min, baseLocation, constraint);
1015 // checkCallerArgumentLocationConstraints(md, nametable, min,
1016 // baseLocation, constraint);
1018 if (!min.getMethod().getReturnType().isVoid()) {
1019 // If method has a return value, compute the highest possible return
1020 // location in the caller's perspective
1021 CompositeLocation ceilingLoc =
1022 computeCeilingLocationForCaller(md, nametable, min, baseLocation, constraint);
1024 if (ceilingLoc == null) {
1025 return new CompositeLocation(Location.createTopLocation(md));
1031 return new CompositeLocation(Location.createTopLocation(md));
1035 private CompositeLocation translateCallerLocToCalleeLoc(MethodDescriptor calleeMD,
1036 CompositeLocation calleeBaseLoc, CompositeLocation constraint) {
1038 CompositeLocation calleeConstraint = new CompositeLocation();
1040 // if (constraint.startsWith(calleeBaseLoc)) {
1041 // if the first part of constraint loc is matched with callee base loc
1042 Location thisLoc = new Location(calleeMD, ssjava.getMethodLattice(calleeMD).getThisLoc());
1043 calleeConstraint.addLocation(thisLoc);
1044 for (int i = calleeBaseLoc.getSize(); i < constraint.getSize(); i++) {
1045 calleeConstraint.addLocation(constraint.get(i));
1050 return calleeConstraint;
1053 private void checkCallerArgumentLocationConstraints(MethodDescriptor md, SymbolTable nametable,
1054 MethodInvokeNode min, CompositeLocation callerBaseLoc, CompositeLocation constraint) {
1055 // if parameter location consists of THIS and FIELD location,
1056 // caller should pass an argument that is comparable to the declared
1057 // parameter location
1058 // and is not lower than the declared parameter location in the field
1061 MethodDescriptor calleemd = min.getMethod();
1063 List<CompositeLocation> callerArgList = new ArrayList<CompositeLocation>();
1064 List<CompositeLocation> calleeParamList = new ArrayList<CompositeLocation>();
1066 MethodLattice<String> calleeLattice = ssjava.getMethodLattice(calleemd);
1067 Location calleeThisLoc = new Location(calleemd, calleeLattice.getThisLoc());
1069 for (int i = 0; i < min.numArgs(); i++) {
1070 ExpressionNode en = min.getArg(i);
1071 CompositeLocation callerArgLoc =
1072 checkLocationFromExpressionNode(md, nametable, en, new CompositeLocation(), constraint,
1074 callerArgList.add(callerArgLoc);
1077 // setup callee params set
1078 for (int i = 0; i < calleemd.numParameters(); i++) {
1079 VarDescriptor calleevd = (VarDescriptor) calleemd.getParameter(i);
1080 CompositeLocation calleeLoc = d2loc.get(calleevd);
1081 calleeParamList.add(calleeLoc);
1084 String errorMsg = generateErrorMessage(md.getClassDesc(), min);
1086 // System.out.println("checkCallerArgumentLocationConstraints=" +
1087 // min.printNode(0));
1088 // System.out.println("base location=" + callerBaseLoc + " constraint=" +
1091 for (int i = 0; i < calleeParamList.size(); i++) {
1092 CompositeLocation calleeParamLoc = calleeParamList.get(i);
1093 if (calleeParamLoc.get(0).equals(calleeThisLoc) && calleeParamLoc.getSize() > 1) {
1095 // callee parameter location has field information
1096 CompositeLocation callerArgLoc = callerArgList.get(i);
1098 CompositeLocation paramLocation =
1099 translateCalleeParamLocToCaller(md, calleeParamLoc, callerBaseLoc, errorMsg);
1101 Set<CompositeLocation> inputGLBSet = new HashSet<CompositeLocation>();
1102 if (constraint != null) {
1103 inputGLBSet.add(callerArgLoc);
1104 inputGLBSet.add(constraint);
1106 CompositeLattice.calculateGLB(inputGLBSet,
1107 generateErrorMessage(md.getClassDesc(), min));
1110 if (!CompositeLattice.isGreaterThan(callerArgLoc, paramLocation, errorMsg)) {
1111 throw new Error("Caller argument '" + min.getArg(i).printNode(0) + " : " + callerArgLoc
1112 + "' should be higher than corresponding callee's parameter : " + paramLocation
1113 + " at " + errorMsg);
1121 private CompositeLocation translateCalleeParamLocToCaller(MethodDescriptor md,
1122 CompositeLocation calleeParamLoc, CompositeLocation callerBaseLocation, String errorMsg) {
1124 CompositeLocation translate = new CompositeLocation();
1126 for (int i = 0; i < callerBaseLocation.getSize(); i++) {
1127 translate.addLocation(callerBaseLocation.get(i));
1130 for (int i = 1; i < calleeParamLoc.getSize(); i++) {
1131 translate.addLocation(calleeParamLoc.get(i));
1134 // System.out.println("TRANSLATED=" + translate + " from calleeParamLoc=" +
1140 private CompositeLocation computeCeilingLocationForCaller(MethodDescriptor md,
1141 SymbolTable nametable, MethodInvokeNode min, CompositeLocation baseLocation,
1142 CompositeLocation constraint) {
1143 List<CompositeLocation> argList = new ArrayList<CompositeLocation>();
1145 // by default, method has a THIS parameter
1146 if (!md.isStatic()) {
1147 argList.add(baseLocation);
1150 for (int i = 0; i < min.numArgs(); i++) {
1151 ExpressionNode en = min.getArg(i);
1152 CompositeLocation callerArg =
1153 checkLocationFromExpressionNode(md, nametable, en, new CompositeLocation(), constraint,
1155 argList.add(callerArg);
1158 // System.out.println("\n## computeReturnLocation=" + min.getMethod() +
1159 // " argList=" + argList);
1160 CompositeLocation ceilLoc = md2ReturnLocGen.get(min.getMethod()).computeReturnLocation(argList);
1161 // System.out.println("## ReturnLocation=" + ceilLoc);
1167 private void checkCalleeConstraints(MethodDescriptor md, SymbolTable nametable,
1168 MethodInvokeNode min, CompositeLocation callerBaseLoc, CompositeLocation constraint) {
1170 MethodDescriptor calleemd = min.getMethod();
1172 MethodLattice<String> calleeLattice = ssjava.getMethodLattice(calleemd);
1174 CompositeLocation calleeThisLoc =
1175 new CompositeLocation(new Location(calleemd, calleeLattice.getThisLoc()));
1177 List<CompositeLocation> callerArgList = new ArrayList<CompositeLocation>();
1178 List<CompositeLocation> calleeParamList = new ArrayList<CompositeLocation>();
1180 if (min.numArgs() > 0) {
1181 // caller needs to guarantee that it passes arguments in regarding to
1182 // callee's hierarchy
1184 // setup caller args set
1185 // first, add caller's base(this) location
1186 if (!calleemd.isStatic())
1187 callerArgList.add(callerBaseLoc);
1188 // second, add caller's arguments
1189 for (int i = 0; i < min.numArgs(); i++) {
1190 ExpressionNode en = min.getArg(i);
1191 CompositeLocation callerArgLoc =
1192 checkLocationFromExpressionNode(md, nametable, en, new CompositeLocation(), constraint,
1194 callerArgList.add(callerArgLoc);
1197 // setup callee params set
1198 // first, add callee's this location
1199 if (!calleemd.isStatic())
1200 calleeParamList.add(calleeThisLoc);
1201 // second, add callee's parameters
1202 for (int i = 0; i < calleemd.numParameters(); i++) {
1203 VarDescriptor calleevd = (VarDescriptor) calleemd.getParameter(i);
1204 CompositeLocation calleeLoc = d2loc.get(calleevd);
1205 // System.out.println("calleevd=" + calleevd + " loc=" + calleeLoc);
1206 calleeParamList.add(calleeLoc);
1209 // here, check if ordering relations among caller's args respect
1210 // ordering relations in-between callee's args
1211 CHECK: for (int i = 0; i < calleeParamList.size(); i++) {
1212 CompositeLocation calleeLoc1 = calleeParamList.get(i);
1213 CompositeLocation callerLoc1 = callerArgList.get(i);
1215 for (int j = 0; j < calleeParamList.size(); j++) {
1217 CompositeLocation calleeLoc2 = calleeParamList.get(j);
1218 CompositeLocation callerLoc2 = callerArgList.get(j);
1220 if (callerLoc1.get(callerLoc1.getSize() - 1).isTop()
1221 || callerLoc2.get(callerLoc2.getSize() - 1).isTop()) {
1225 // System.out.println("calleeLoc1=" + calleeLoc1);
1226 // System.out.println("calleeLoc2=" + calleeLoc2 +
1227 // "calleeParamList=" + calleeParamList);
1230 CompositeLattice.compare(callerLoc1, callerLoc2, true,
1231 generateErrorMessage(md.getClassDesc(), min));
1232 // System.out.println("callerResult=" + callerResult);
1234 CompositeLattice.compare(calleeLoc1, calleeLoc2, true,
1235 generateErrorMessage(md.getClassDesc(), min));
1236 // System.out.println("calleeResult=" + calleeResult);
1238 if (callerResult == ComparisonResult.EQUAL) {
1239 if (ssjava.isSharedLocation(callerLoc1.get(callerLoc1.getSize() - 1))
1240 && ssjava.isSharedLocation(callerLoc2.get(callerLoc2.getSize() - 1))) {
1241 // if both of them are shared locations, promote them to
1242 // "GREATER relation"
1243 callerResult = ComparisonResult.GREATER;
1247 if (calleeResult == ComparisonResult.GREATER
1248 && callerResult != ComparisonResult.GREATER) {
1249 // If calleeLoc1 is higher than calleeLoc2
1250 // then, caller should have same ordering relation in-bet
1251 // callerLoc1 & callerLoc2
1253 String paramName1, paramName2;
1256 paramName1 = "'THIS'";
1258 paramName1 = "'parameter " + calleemd.getParamName(i - 1) + "'";
1262 paramName2 = "'THIS'";
1264 paramName2 = "'parameter " + calleemd.getParamName(j - 1) + "'";
1268 "Caller doesn't respect an ordering relation among method arguments: callee expects that "
1269 + paramName1 + " should be higher than " + paramName2 + " in " + calleemd
1270 + " at " + md.getClassDesc().getSourceFileName() + ":" + min.getNumLine());
1281 private CompositeLocation checkLocationFromArrayAccessNode(MethodDescriptor md,
1282 SymbolTable nametable, ArrayAccessNode aan, CompositeLocation constraint, boolean isLHS) {
1284 ClassDescriptor cd = md.getClassDesc();
1286 CompositeLocation arrayLoc =
1287 checkLocationFromExpressionNode(md, nametable, aan.getExpression(),
1288 new CompositeLocation(), constraint, isLHS);
1290 // addTypeLocation(aan.getExpression().getType(), arrayLoc);
1291 CompositeLocation indexLoc =
1292 checkLocationFromExpressionNode(md, nametable, aan.getIndex(), new CompositeLocation(),
1294 // addTypeLocation(aan.getIndex().getType(), indexLoc);
1297 if (!CompositeLattice.isGreaterThan(indexLoc, arrayLoc, generateErrorMessage(cd, aan))) {
1298 throw new Error("Array index value is not higher than array location at "
1299 + generateErrorMessage(cd, aan));
1303 Set<CompositeLocation> inputGLB = new HashSet<CompositeLocation>();
1304 inputGLB.add(arrayLoc);
1305 inputGLB.add(indexLoc);
1306 return CompositeLattice.calculateGLB(inputGLB, generateErrorMessage(cd, aan));
1311 private CompositeLocation checkLocationFromCreateObjectNode(MethodDescriptor md,
1312 SymbolTable nametable, CreateObjectNode con) {
1314 ClassDescriptor cd = md.getClassDesc();
1316 CompositeLocation compLoc = new CompositeLocation();
1317 compLoc.addLocation(Location.createTopLocation(md));
1322 private CompositeLocation checkLocationFromOpNode(MethodDescriptor md, SymbolTable nametable,
1323 OpNode on, CompositeLocation constraint) {
1325 ClassDescriptor cd = md.getClassDesc();
1326 CompositeLocation leftLoc = new CompositeLocation();
1328 checkLocationFromExpressionNode(md, nametable, on.getLeft(), leftLoc, constraint, false);
1329 // addTypeLocation(on.getLeft().getType(), leftLoc);
1331 CompositeLocation rightLoc = new CompositeLocation();
1332 if (on.getRight() != null) {
1334 checkLocationFromExpressionNode(md, nametable, on.getRight(), rightLoc, constraint, false);
1335 // addTypeLocation(on.getRight().getType(), rightLoc);
1338 // System.out.println("\n# OP NODE=" + on.printNode(0));
1339 // System.out.println("# left loc=" + leftLoc + " from " +
1340 // on.getLeft().getClass());
1341 // if (on.getRight() != null) {
1342 // System.out.println("# right loc=" + rightLoc + " from " +
1343 // on.getRight().getClass());
1346 Operation op = on.getOp();
1348 switch (op.getOp()) {
1350 case Operation.UNARYPLUS:
1351 case Operation.UNARYMINUS:
1352 case Operation.LOGIC_NOT:
1356 case Operation.LOGIC_OR:
1357 case Operation.LOGIC_AND:
1358 case Operation.COMP:
1359 case Operation.BIT_OR:
1360 case Operation.BIT_XOR:
1361 case Operation.BIT_AND:
1362 case Operation.ISAVAILABLE:
1363 case Operation.EQUAL:
1364 case Operation.NOTEQUAL:
1371 case Operation.MULT:
1374 case Operation.LEFTSHIFT:
1375 case Operation.RIGHTSHIFT:
1376 case Operation.URIGHTSHIFT:
1378 Set<CompositeLocation> inputSet = new HashSet<CompositeLocation>();
1379 inputSet.add(leftLoc);
1380 inputSet.add(rightLoc);
1381 CompositeLocation glbCompLoc =
1382 CompositeLattice.calculateGLB(inputSet, generateErrorMessage(cd, on));
1386 throw new Error(op.toString());
1391 private CompositeLocation checkLocationFromLiteralNode(MethodDescriptor md,
1392 SymbolTable nametable, LiteralNode en, CompositeLocation loc) {
1394 // literal value has the top location so that value can be flowed into any
1396 Location literalLoc = Location.createTopLocation(md);
1397 loc.addLocation(literalLoc);
1402 private CompositeLocation checkLocationFromNameNode(MethodDescriptor md, SymbolTable nametable,
1403 NameNode nn, CompositeLocation loc, CompositeLocation constraint) {
1405 NameDescriptor nd = nn.getName();
1406 if (nd.getBase() != null) {
1408 checkLocationFromExpressionNode(md, nametable, nn.getExpression(), loc, constraint, false);
1410 String varname = nd.toString();
1411 if (varname.equals("this")) {
1413 MethodLattice<String> methodLattice = ssjava.getMethodLattice(md);
1414 String thisLocId = methodLattice.getThisLoc();
1415 if (thisLocId == null) {
1416 throw new Error("The location for 'this' is not defined at "
1417 + md.getClassDesc().getSourceFileName() + "::" + nn.getNumLine());
1419 Location locElement = new Location(md, thisLocId);
1420 loc.addLocation(locElement);
1425 Descriptor d = (Descriptor) nametable.get(varname);
1427 // CompositeLocation localLoc = null;
1428 if (d instanceof VarDescriptor) {
1429 VarDescriptor vd = (VarDescriptor) d;
1430 // localLoc = d2loc.get(vd);
1431 // the type of var descriptor has a composite location!
1432 loc = ((SSJavaType) vd.getType().getExtension()).getCompLoc().clone();
1433 } else if (d instanceof FieldDescriptor) {
1434 // the type of field descriptor has a location!
1435 FieldDescriptor fd = (FieldDescriptor) d;
1436 if (fd.isStatic()) {
1438 // if it is 'static final', the location has TOP since no one can
1440 loc.addLocation(Location.createTopLocation(md));
1443 // if 'static', the location has pre-assigned global loc
1444 MethodLattice<String> localLattice = ssjava.getMethodLattice(md);
1445 String globalLocId = localLattice.getGlobalLoc();
1446 if (globalLocId == null) {
1447 throw new Error("Global location element is not defined in the method " + md);
1449 Location globalLoc = new Location(md, globalLocId);
1451 loc.addLocation(globalLoc);
1454 // the location of field access starts from this, followed by field
1456 MethodLattice<String> localLattice = ssjava.getMethodLattice(md);
1457 Location thisLoc = new Location(md, localLattice.getThisLoc());
1458 loc.addLocation(thisLoc);
1461 Location fieldLoc = (Location) fd.getType().getExtension();
1462 loc.addLocation(fieldLoc);
1463 } else if (d == null) {
1464 // access static field
1465 FieldDescriptor fd = nn.getField();
1467 MethodLattice<String> localLattice = ssjava.getMethodLattice(md);
1468 String globalLocId = localLattice.getGlobalLoc();
1469 if (globalLocId == null) {
1470 throw new Error("Method lattice does not define global variable location at "
1471 + generateErrorMessage(md.getClassDesc(), nn));
1473 loc.addLocation(new Location(md, globalLocId));
1475 Location fieldLoc = (Location) fd.getType().getExtension();
1476 loc.addLocation(fieldLoc);
1485 private CompositeLocation checkLocationFromFieldAccessNode(MethodDescriptor md,
1486 SymbolTable nametable, FieldAccessNode fan, CompositeLocation loc,
1487 CompositeLocation constraint) {
1489 ExpressionNode left = fan.getExpression();
1490 TypeDescriptor ltd = left.getType();
1492 FieldDescriptor fd = fan.getField();
1494 String varName = null;
1495 if (left.kind() == Kind.NameNode) {
1496 NameDescriptor nd = ((NameNode) left).getName();
1497 varName = nd.toString();
1500 if (ltd.isClassNameRef() || (varName != null && varName.equals("this"))) {
1501 // using a class name directly or access using this
1502 if (fd.isStatic() && fd.isFinal()) {
1503 loc.addLocation(Location.createTopLocation(md));
1508 Set<CompositeLocation> inputGLB = new HashSet<CompositeLocation>();
1509 if (left instanceof ArrayAccessNode) {
1510 ArrayAccessNode aan = (ArrayAccessNode) left;
1511 CompositeLocation indexLoc =
1512 checkLocationFromExpressionNode(md, nametable, aan.getIndex(), loc, constraint, false);
1513 inputGLB.add(indexLoc);
1516 loc = checkLocationFromExpressionNode(md, nametable, left, loc, constraint, false);
1518 if (!left.getType().isPrimitive()) {
1520 if (!fd.getSymbol().equals("length")) {
1521 // array.length access, return the location of the array
1522 Location fieldLoc = getFieldLocation(fd);
1523 loc.addLocation(fieldLoc);
1529 loc = CompositeLattice.calculateGLB(inputGLB, generateErrorMessage(md.getClassDesc(), fan));
1533 private Location getFieldLocation(FieldDescriptor fd) {
1535 // System.out.println("### getFieldLocation=" + fd);
1536 // System.out.println("### fd.getType().getExtension()=" +
1537 // fd.getType().getExtension());
1539 Location fieldLoc = (Location) fd.getType().getExtension();
1541 // handle the case that method annotation checking skips checking field
1543 if (fieldLoc == null) {
1544 fieldLoc = checkFieldDeclaration(fd.getClassDescriptor(), fd);
1551 private FieldDescriptor getFieldDescriptorFromExpressionNode(ExpressionNode en) {
1553 if (en.kind() == Kind.NameNode) {
1554 NameNode nn = (NameNode) en;
1555 if (nn.getField() != null) {
1556 return nn.getField();
1559 if (nn.getName() != null && nn.getName().getBase() != null) {
1560 return getFieldDescriptorFromExpressionNode(nn.getExpression());
1563 } else if (en.kind() == Kind.FieldAccessNode) {
1564 FieldAccessNode fan = (FieldAccessNode) en;
1565 return fan.getField();
1571 private CompositeLocation checkLocationFromAssignmentNode(MethodDescriptor md,
1572 SymbolTable nametable, AssignmentNode an, CompositeLocation loc, CompositeLocation constraint) {
1573 ClassDescriptor cd = md.getClassDesc();
1575 Set<CompositeLocation> inputGLBSet = new HashSet<CompositeLocation>();
1577 boolean postinc = true;
1578 if (an.getOperation().getBaseOp() == null
1579 || (an.getOperation().getBaseOp().getOp() != Operation.POSTINC && an.getOperation()
1580 .getBaseOp().getOp() != Operation.POSTDEC))
1583 // if LHS is array access node, need to check if array index is higher
1584 // than array itself
1585 CompositeLocation destLocation =
1586 checkLocationFromExpressionNode(md, nametable, an.getDest(), new CompositeLocation(),
1589 CompositeLocation rhsLocation;
1590 CompositeLocation srcLocation;
1594 checkOwnership(md, an, an.getSrc());
1597 checkLocationFromExpressionNode(md, nametable, an.getSrc(), new CompositeLocation(),
1600 if (an.getOperation().getOp() >= 2 && an.getOperation().getOp() <= 12) {
1601 // if assignment contains OP+EQ operator, need to merge location types
1602 // of LHS & RHS into the RHS
1603 Set<CompositeLocation> srcGLBSet = new HashSet<CompositeLocation>();
1604 srcGLBSet.add(rhsLocation);
1605 srcGLBSet.add(destLocation);
1606 srcLocation = CompositeLattice.calculateGLB(srcGLBSet, generateErrorMessage(cd, an));
1608 srcLocation = rhsLocation;
1611 if (constraint != null) {
1613 if (!CompositeLattice.isGreaterThan(constraint, destLocation, generateErrorMessage(cd, an))) {
1614 throw new Error("The value flow from " + constraint + " to " + destLocation
1615 + " does not respect location hierarchy on the assignment " + an.printNode(0)
1616 + " at " + cd.getSourceFileName() + "::" + an.getNumLine());
1618 // inputGLBSet.add(srcLocation);
1619 // inputGLBSet.add(constraint);
1620 // srcLocation = CompositeLattice.calculateGLB(inputGLBSet,
1621 // generateErrorMessage(cd, an));
1624 if (!CompositeLattice.isGreaterThan(srcLocation, destLocation, generateErrorMessage(cd, an))) {
1626 String context = "";
1627 if (constraint != null) {
1628 context = " and the current context constraint is " + constraint;
1631 throw new Error("The value flow from " + srcLocation + " to " + destLocation
1632 + " does not respect location hierarchy on the assignment " + an.printNode(0) + context
1633 + " at " + cd.getSourceFileName() + "::" + an.getNumLine());
1636 if (srcLocation.equals(destLocation)) {
1637 // keep it for definitely written analysis
1638 Set<FlatNode> flatNodeSet = ssjava.getBuildFlat().getFlatNodeSet(an);
1639 for (Iterator iterator = flatNodeSet.iterator(); iterator.hasNext();) {
1640 FlatNode fn = (FlatNode) iterator.next();
1641 ssjava.addSameHeightWriteFlatNode(fn);
1649 checkLocationFromExpressionNode(md, nametable, an.getDest(), new CompositeLocation(),
1652 if (constraint != null) {
1654 if (!CompositeLattice.isGreaterThan(constraint, destLocation, generateErrorMessage(cd, an))) {
1655 throw new Error("The value flow from " + constraint + " to " + destLocation
1656 + " does not respect location hierarchy on the assignment " + an.printNode(0)
1657 + " at " + cd.getSourceFileName() + "::" + an.getNumLine());
1659 // inputGLBSet.add(rhsLocation);
1660 // inputGLBSet.add(constraint);
1661 // srcLocation = CompositeLattice.calculateGLB(inputGLBSet,
1662 // generateErrorMessage(cd, an));
1663 srcLocation = rhsLocation;
1665 srcLocation = rhsLocation;
1668 if (!CompositeLattice.isGreaterThan(srcLocation, destLocation, generateErrorMessage(cd, an))) {
1670 if (srcLocation.equals(destLocation)) {
1671 throw new Error("Location " + srcLocation
1672 + " is not allowed to have the value flow that moves within the same location at '"
1673 + an.printNode(0) + "' of " + cd.getSourceFileName() + "::" + an.getNumLine());
1675 throw new Error("The value flow from " + srcLocation + " to " + destLocation
1676 + " does not respect location hierarchy on the assignment " + an.printNode(0)
1677 + " at " + cd.getSourceFileName() + "::" + an.getNumLine());
1682 if (srcLocation.equals(destLocation)) {
1683 // keep it for definitely written analysis
1684 Set<FlatNode> flatNodeSet = ssjava.getBuildFlat().getFlatNodeSet(an);
1685 for (Iterator iterator = flatNodeSet.iterator(); iterator.hasNext();) {
1686 FlatNode fn = (FlatNode) iterator.next();
1687 ssjava.addSameHeightWriteFlatNode(fn);
1693 return destLocation;
1696 private void assignLocationOfVarDescriptor(VarDescriptor vd, MethodDescriptor md,
1697 SymbolTable nametable, TreeNode n) {
1699 ClassDescriptor cd = md.getClassDesc();
1700 Vector<AnnotationDescriptor> annotationVec = vd.getType().getAnnotationMarkers();
1702 // currently enforce every variable to have corresponding location
1703 if (annotationVec.size() == 0) {
1704 throw new Error("Location is not assigned to variable '" + vd.getSymbol()
1705 + "' in the method '" + md + "' of the class " + cd.getSymbol() + " at "
1706 + generateErrorMessage(cd, n));
1709 int locDecCount = 0;
1710 for (int i = 0; i < annotationVec.size(); i++) {
1711 AnnotationDescriptor ad = annotationVec.elementAt(i);
1713 if (ad.getType() == AnnotationDescriptor.SINGLE_ANNOTATION) {
1715 if (ad.getMarker().equals(SSJavaAnalysis.LOC)) {
1717 if (locDecCount > 1) {// variable can have at most one location
1718 throw new Error(vd.getSymbol() + " has more than one location declaration.");
1720 String locDec = ad.getValue(); // check if location is defined
1722 if (locDec.startsWith(SSJavaAnalysis.DELTA)) {
1723 DeltaLocation deltaLoc = parseDeltaDeclaration(md, n, locDec);
1724 d2loc.put(vd, deltaLoc);
1725 addLocationType(vd.getType(), deltaLoc);
1727 CompositeLocation compLoc = parseLocationDeclaration(md, n, locDec);
1729 Location lastElement = compLoc.get(compLoc.getSize() - 1);
1730 if (ssjava.isSharedLocation(lastElement)) {
1731 ssjava.mapSharedLocation2Descriptor(lastElement, vd);
1734 d2loc.put(vd, compLoc);
1735 addLocationType(vd.getType(), compLoc);
1744 private DeltaLocation parseDeltaDeclaration(MethodDescriptor md, TreeNode n, String locDec) {
1747 int dIdx = locDec.indexOf(SSJavaAnalysis.DELTA);
1750 int beginIdx = dIdx + 6;
1751 locDec = locDec.substring(beginIdx, locDec.length() - 1);
1752 dIdx = locDec.indexOf(SSJavaAnalysis.DELTA);
1755 CompositeLocation compLoc = parseLocationDeclaration(md, n, locDec);
1756 DeltaLocation deltaLoc = new DeltaLocation(compLoc, deltaCount);
1761 private Location parseFieldLocDeclaraton(String decl, String msg) throws Exception {
1763 int idx = decl.indexOf(".");
1765 String className = decl.substring(0, idx);
1766 String fieldName = decl.substring(idx + 1);
1768 className.replaceAll(" ", "");
1769 fieldName.replaceAll(" ", "");
1771 Descriptor d = state.getClassSymbolTable().get(className);
1774 // System.out.println("state.getClassSymbolTable()=" +
1775 // state.getClassSymbolTable());
1776 throw new Error("The class in the location declaration '" + decl + "' does not exist at "
1780 assert (d instanceof ClassDescriptor);
1781 SSJavaLattice<String> lattice = ssjava.getClassLattice((ClassDescriptor) d);
1782 if (!lattice.containsKey(fieldName)) {
1783 throw new Error("The location " + fieldName + " is not defined in the field lattice of '"
1784 + className + "' at " + msg);
1787 return new Location(d, fieldName);
1790 private CompositeLocation parseLocationDeclaration(MethodDescriptor md, TreeNode n, String locDec) {
1792 CompositeLocation compLoc = new CompositeLocation();
1794 StringTokenizer tokenizer = new StringTokenizer(locDec, ",");
1795 List<String> locIdList = new ArrayList<String>();
1796 while (tokenizer.hasMoreTokens()) {
1797 String locId = tokenizer.nextToken();
1798 locIdList.add(locId);
1801 // at least,one location element needs to be here!
1802 assert (locIdList.size() > 0);
1804 // assume that loc with idx 0 comes from the local lattice
1805 // loc with idx 1 comes from the field lattice
1807 String localLocId = locIdList.get(0);
1808 SSJavaLattice<String> localLattice = CompositeLattice.getLatticeByDescriptor(md);
1809 Location localLoc = new Location(md, localLocId);
1810 if (localLattice == null || (!localLattice.containsKey(localLocId))) {
1811 throw new Error("Location " + localLocId
1812 + " is not defined in the local variable lattice at "
1813 + md.getClassDesc().getSourceFileName() + "::" + (n != null ? n.getNumLine() : md) + ".");
1815 compLoc.addLocation(localLoc);
1817 for (int i = 1; i < locIdList.size(); i++) {
1818 String locName = locIdList.get(i);
1821 parseFieldLocDeclaraton(locName, generateErrorMessage(md.getClassDesc(), n));
1822 compLoc.addLocation(fieldLoc);
1823 } catch (Exception e) {
1824 throw new Error("The location declaration '" + locName + "' is wrong at "
1825 + generateErrorMessage(md.getClassDesc(), n));
1833 private void checkDeclarationNode(MethodDescriptor md, SymbolTable nametable, DeclarationNode dn) {
1834 VarDescriptor vd = dn.getVarDescriptor();
1835 assignLocationOfVarDescriptor(vd, md, nametable, dn);
1838 private void checkDeclarationInClass(ClassDescriptor cd) {
1839 // Check to see that fields are okay
1840 for (Iterator field_it = cd.getFields(); field_it.hasNext();) {
1841 FieldDescriptor fd = (FieldDescriptor) field_it.next();
1843 if (!(fd.isFinal() && fd.isStatic())) {
1844 checkFieldDeclaration(cd, fd);
1846 // for static final, assign top location by default
1847 Location loc = Location.createTopLocation(cd);
1848 addLocationType(fd.getType(), loc);
1853 private Location checkFieldDeclaration(ClassDescriptor cd, FieldDescriptor fd) {
1855 Vector<AnnotationDescriptor> annotationVec = fd.getType().getAnnotationMarkers();
1857 // currently enforce every field to have corresponding location
1858 if (annotationVec.size() == 0) {
1859 throw new Error("Location is not assigned to the field '" + fd.getSymbol()
1860 + "' of the class " + cd.getSymbol() + " at " + cd.getSourceFileName());
1863 if (annotationVec.size() > 1) {
1864 // variable can have at most one location
1865 throw new Error("Field " + fd.getSymbol() + " of class " + cd
1866 + " has more than one location.");
1869 AnnotationDescriptor ad = annotationVec.elementAt(0);
1870 Location loc = null;
1872 if (ad.getType() == AnnotationDescriptor.SINGLE_ANNOTATION) {
1873 if (ad.getMarker().equals(SSJavaAnalysis.LOC)) {
1874 String locationID = ad.getValue();
1875 // check if location is defined
1876 SSJavaLattice<String> lattice = ssjava.getClassLattice(cd);
1877 if (lattice == null || (!lattice.containsKey(locationID))) {
1878 throw new Error("Location " + locationID
1879 + " is not defined in the field lattice of class " + cd.getSymbol() + " at"
1880 + cd.getSourceFileName() + ".");
1882 loc = new Location(cd, locationID);
1884 if (ssjava.isSharedLocation(loc)) {
1885 ssjava.mapSharedLocation2Descriptor(loc, fd);
1888 addLocationType(fd.getType(), loc);
1896 private void addLocationType(TypeDescriptor type, CompositeLocation loc) {
1898 TypeExtension te = type.getExtension();
1901 ssType = (SSJavaType) te;
1902 ssType.setCompLoc(loc);
1904 ssType = new SSJavaType(loc);
1905 type.setExtension(ssType);
1910 private void addLocationType(TypeDescriptor type, Location loc) {
1912 type.setExtension(loc);
1916 static class CompositeLattice {
1918 public static boolean isGreaterThan(CompositeLocation loc1, CompositeLocation loc2, String msg) {
1920 // System.out.println("\nisGreaterThan=" + loc1 + " " + loc2 + " msg=" +
1922 int baseCompareResult = compareBaseLocationSet(loc1, loc2, true, false, msg);
1923 if (baseCompareResult == ComparisonResult.EQUAL) {
1924 if (compareDelta(loc1, loc2) == ComparisonResult.GREATER) {
1929 } else if (baseCompareResult == ComparisonResult.GREATER) {
1937 public static int compare(CompositeLocation loc1, CompositeLocation loc2, boolean ignore,
1940 // System.out.println("compare=" + loc1 + " " + loc2);
1941 int baseCompareResult = compareBaseLocationSet(loc1, loc2, false, ignore, msg);
1943 if (baseCompareResult == ComparisonResult.EQUAL) {
1944 return compareDelta(loc1, loc2);
1946 return baseCompareResult;
1951 private static int compareDelta(CompositeLocation dLoc1, CompositeLocation dLoc2) {
1953 int deltaCount1 = 0;
1954 int deltaCount2 = 0;
1955 if (dLoc1 instanceof DeltaLocation) {
1956 deltaCount1 = ((DeltaLocation) dLoc1).getNumDelta();
1959 if (dLoc2 instanceof DeltaLocation) {
1960 deltaCount2 = ((DeltaLocation) dLoc2).getNumDelta();
1962 if (deltaCount1 < deltaCount2) {
1963 return ComparisonResult.GREATER;
1964 } else if (deltaCount1 == deltaCount2) {
1965 return ComparisonResult.EQUAL;
1967 return ComparisonResult.LESS;
1972 private static int compareBaseLocationSet(CompositeLocation compLoc1,
1973 CompositeLocation compLoc2, boolean awareSharedLoc, boolean ignore, String msg) {
1975 // if compLoc1 is greater than compLoc2, return true
1976 // else return false;
1978 // compare one by one in according to the order of the tuple
1980 for (int i = 0; i < compLoc1.getSize(); i++) {
1981 Location loc1 = compLoc1.get(i);
1982 if (i >= compLoc2.getSize()) {
1984 return ComparisonResult.INCOMPARABLE;
1986 throw new Error("Failed to compare two locations of " + compLoc1 + " and " + compLoc2
1987 + " because they are not comparable at " + msg);
1990 Location loc2 = compLoc2.get(i);
1992 Descriptor descriptor = getCommonParentDescriptor(loc1, loc2, msg);
1993 SSJavaLattice<String> lattice = getLatticeByDescriptor(descriptor);
1995 // check if the shared location is appeared only at the end of the
1996 // composite location
1997 if (lattice.getSharedLocSet().contains(loc1.getLocIdentifier())) {
1998 if (i != (compLoc1.getSize() - 1)) {
1999 throw new Error("The shared location " + loc1.getLocIdentifier()
2000 + " cannot be appeared in the middle of composite location at" + msg);
2004 if (lattice.getSharedLocSet().contains(loc2.getLocIdentifier())) {
2005 if (i != (compLoc2.getSize() - 1)) {
2006 throw new Error("The shared location " + loc2.getLocIdentifier()
2007 + " cannot be appeared in the middle of composite location at " + msg);
2011 // if (!lattice1.equals(lattice2)) {
2012 // throw new Error("Failed to compare two locations of " + compLoc1 +
2013 // " and " + compLoc2
2014 // + " because they are not comparable at " + msg);
2017 if (loc1.getLocIdentifier().equals(loc2.getLocIdentifier())) {
2019 // check if the current location is the spinning location
2020 // note that the spinning location only can be appeared in the last
2021 // part of the composite location
2022 if (awareSharedLoc && numOfTie == compLoc1.getSize()
2023 && lattice.getSharedLocSet().contains(loc1.getLocIdentifier())) {
2024 return ComparisonResult.GREATER;
2027 } else if (lattice.isGreaterThan(loc1.getLocIdentifier(), loc2.getLocIdentifier())) {
2028 return ComparisonResult.GREATER;
2030 return ComparisonResult.LESS;
2035 if (numOfTie == compLoc1.getSize()) {
2037 if (numOfTie != compLoc2.getSize()) {
2040 return ComparisonResult.INCOMPARABLE;
2042 throw new Error("Failed to compare two locations of " + compLoc1 + " and " + compLoc2
2043 + " because they are not comparable at " + msg);
2048 return ComparisonResult.EQUAL;
2051 return ComparisonResult.LESS;
2055 public static CompositeLocation calculateGLB(Set<CompositeLocation> inputSet, String errMsg) {
2057 // System.out.println("Calculating GLB=" + inputSet);
2058 CompositeLocation glbCompLoc = new CompositeLocation();
2060 // calculate GLB of the first(priority) element
2061 Set<String> priorityLocIdentifierSet = new HashSet<String>();
2062 Descriptor priorityDescriptor = null;
2064 Hashtable<String, Set<CompositeLocation>> locId2CompLocSet =
2065 new Hashtable<String, Set<CompositeLocation>>();
2066 // mapping from the priority loc ID to its full representation by the
2067 // composite location
2069 int maxTupleSize = 0;
2070 CompositeLocation maxCompLoc = null;
2072 Location prevPriorityLoc = null;
2073 for (Iterator iterator = inputSet.iterator(); iterator.hasNext();) {
2074 CompositeLocation compLoc = (CompositeLocation) iterator.next();
2075 if (compLoc.getSize() > maxTupleSize) {
2076 maxTupleSize = compLoc.getSize();
2077 maxCompLoc = compLoc;
2079 Location priorityLoc = compLoc.get(0);
2080 String priorityLocId = priorityLoc.getLocIdentifier();
2081 priorityLocIdentifierSet.add(priorityLocId);
2083 if (locId2CompLocSet.containsKey(priorityLocId)) {
2084 locId2CompLocSet.get(priorityLocId).add(compLoc);
2086 Set<CompositeLocation> newSet = new HashSet<CompositeLocation>();
2087 newSet.add(compLoc);
2088 locId2CompLocSet.put(priorityLocId, newSet);
2091 // check if priority location are coming from the same lattice
2092 if (priorityDescriptor == null) {
2093 priorityDescriptor = priorityLoc.getDescriptor();
2095 priorityDescriptor = getCommonParentDescriptor(priorityLoc, prevPriorityLoc, errMsg);
2097 prevPriorityLoc = priorityLoc;
2098 // else if (!priorityDescriptor.equals(priorityLoc.getDescriptor())) {
2099 // throw new Error("Failed to calculate GLB of " + inputSet
2100 // + " because they are from different lattices.");
2104 SSJavaLattice<String> locOrder = getLatticeByDescriptor(priorityDescriptor);
2105 String glbOfPriorityLoc = locOrder.getGLB(priorityLocIdentifierSet);
2106 glbCompLoc.addLocation(new Location(priorityDescriptor, glbOfPriorityLoc));
2107 Set<CompositeLocation> compSet = locId2CompLocSet.get(glbOfPriorityLoc);
2109 if (compSet == null) {
2110 // when GLB(x1,x2)!=x1 and !=x2 : GLB case 4
2111 // mean that the result is already lower than <x1,y1> and <x2,y2>
2112 // assign TOP to the rest of the location elements
2114 // in this case, do not take care about delta
2115 // CompositeLocation inputComp = inputSet.iterator().next();
2116 for (int i = 1; i < maxTupleSize; i++) {
2117 glbCompLoc.addLocation(Location.createTopLocation(maxCompLoc.get(i).getDescriptor()));
2121 // here find out composite location that has a maximum length tuple
2122 // if we have three input set: [A], [A,B], [A,B,C]
2123 // maximum length tuple will be [A,B,C]
2125 CompositeLocation maxFromCompSet = null;
2126 for (Iterator iterator = compSet.iterator(); iterator.hasNext();) {
2127 CompositeLocation c = (CompositeLocation) iterator.next();
2128 if (c.getSize() > max) {
2134 if (compSet.size() == 1) {
2135 // if GLB(x1,x2)==x1 or x2 : GLB case 2,3
2136 CompositeLocation comp = compSet.iterator().next();
2137 for (int i = 1; i < comp.getSize(); i++) {
2138 glbCompLoc.addLocation(comp.get(i));
2141 // if input location corresponding to glb is a delta, need to apply
2142 // delta to glb result
2143 if (comp instanceof DeltaLocation) {
2144 glbCompLoc = new DeltaLocation(glbCompLoc, 1);
2148 // when GLB(x1,x2)==x1 and x2 : GLB case 1
2149 // if more than one location shares the same priority GLB
2150 // need to calculate the rest of GLB loc
2152 // setup input set starting from the second tuple item
2153 Set<CompositeLocation> innerGLBInput = new HashSet<CompositeLocation>();
2154 for (Iterator iterator = compSet.iterator(); iterator.hasNext();) {
2155 CompositeLocation compLoc = (CompositeLocation) iterator.next();
2156 CompositeLocation innerCompLoc = new CompositeLocation();
2157 for (int idx = 1; idx < compLoc.getSize(); idx++) {
2158 innerCompLoc.addLocation(compLoc.get(idx));
2160 if (innerCompLoc.getSize() > 0) {
2161 innerGLBInput.add(innerCompLoc);
2165 if (innerGLBInput.size() > 0) {
2166 CompositeLocation innerGLB = CompositeLattice.calculateGLB(innerGLBInput, errMsg);
2167 for (int idx = 0; idx < innerGLB.getSize(); idx++) {
2168 glbCompLoc.addLocation(innerGLB.get(idx));
2172 // if input location corresponding to glb is a delta, need to apply
2173 // delta to glb result
2175 for (Iterator iterator = compSet.iterator(); iterator.hasNext();) {
2176 CompositeLocation compLoc = (CompositeLocation) iterator.next();
2177 if (compLoc instanceof DeltaLocation) {
2178 if (glbCompLoc.equals(compLoc)) {
2179 glbCompLoc = new DeltaLocation(glbCompLoc, 1);
2188 // System.out.println("GLB=" + glbCompLoc);
2193 static SSJavaLattice<String> getLatticeByDescriptor(Descriptor d) {
2195 SSJavaLattice<String> lattice = null;
2197 if (d instanceof ClassDescriptor) {
2198 lattice = ssjava.getCd2lattice().get(d);
2199 } else if (d instanceof MethodDescriptor) {
2200 if (ssjava.getMd2lattice().containsKey(d)) {
2201 lattice = ssjava.getMd2lattice().get(d);
2203 // use default lattice for the method
2204 lattice = ssjava.getCd2methodDefault().get(((MethodDescriptor) d).getClassDesc());
2211 static Descriptor getCommonParentDescriptor(Location loc1, Location loc2, String msg) {
2213 Descriptor d1 = loc1.getDescriptor();
2214 Descriptor d2 = loc2.getDescriptor();
2216 Descriptor descriptor;
2218 if (d1 instanceof ClassDescriptor && d2 instanceof ClassDescriptor) {
2220 if (d1.equals(d2)) {
2223 // identifying which one is parent class
2224 Set<Descriptor> d1SubClassesSet = ssjava.tu.getSubClasses((ClassDescriptor) d1);
2225 Set<Descriptor> d2SubClassesSet = ssjava.tu.getSubClasses((ClassDescriptor) d2);
2227 if (d1 == null && d2 == null) {
2228 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2229 + " because they are not comparable at " + msg);
2230 } else if (d1SubClassesSet != null && d1SubClassesSet.contains(d2)) {
2232 } else if (d2SubClassesSet != null && d2SubClassesSet.contains(d1)) {
2235 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2236 + " because they are not comparable at " + msg);
2240 } else if (d1 instanceof MethodDescriptor && d2 instanceof MethodDescriptor) {
2242 if (d1.equals(d2)) {
2246 // identifying which one is parent class
2247 MethodDescriptor md1 = (MethodDescriptor) d1;
2248 MethodDescriptor md2 = (MethodDescriptor) d2;
2250 if (!md1.matches(md2)) {
2251 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2252 + " because they are not comparable at " + msg);
2255 Set<Descriptor> d1SubClassesSet =
2256 ssjava.tu.getSubClasses(((MethodDescriptor) d1).getClassDesc());
2257 Set<Descriptor> d2SubClassesSet =
2258 ssjava.tu.getSubClasses(((MethodDescriptor) d2).getClassDesc());
2260 if (d1 == null && d2 == null) {
2261 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2262 + " because they are not comparable at " + msg);
2263 } else if (d1 != null && d1SubClassesSet.contains(d2)) {
2265 } else if (d2 != null && d2SubClassesSet.contains(d1)) {
2268 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2269 + " because they are not comparable at " + msg);
2274 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2275 + " because they are not comparable at " + msg);
2284 class ComparisonResult {
2286 public static final int GREATER = 0;
2287 public static final int EQUAL = 1;
2288 public static final int LESS = 2;
2289 public static final int INCOMPARABLE = 3;
2296 class ReturnLocGenerator {
2298 public static final int PARAMISHIGHER = 0;
2299 public static final int PARAMISSAME = 1;
2300 public static final int IGNORE = 2;
2302 private Hashtable<Integer, Integer> paramIdx2paramType;
2304 private CompositeLocation declaredReturnLoc = null;
2306 public ReturnLocGenerator(CompositeLocation returnLoc, MethodDescriptor md,
2307 List<CompositeLocation> params, String msg) {
2309 CompositeLocation thisLoc = params.get(0);
2310 if (returnLoc.get(0).equals(thisLoc.get(0)) && returnLoc.getSize() > 1) {
2311 // if the declared return location consists of THIS and field location,
2312 // return location for the caller's side has to have same field element
2313 this.declaredReturnLoc = returnLoc;
2315 // creating mappings
2316 paramIdx2paramType = new Hashtable<Integer, Integer>();
2317 for (int i = 0; i < params.size(); i++) {
2318 CompositeLocation param = params.get(i);
2319 int compareResult = CompositeLattice.compare(param, returnLoc, true, msg);
2322 if (compareResult == ComparisonResult.GREATER) {
2324 } else if (compareResult == ComparisonResult.EQUAL) {
2329 paramIdx2paramType.put(new Integer(i), new Integer(type));
2335 public CompositeLocation computeReturnLocation(List<CompositeLocation> args) {
2337 if (declaredReturnLoc != null) {
2338 // when developer specify that the return value is [THIS,field]
2339 // needs to translate to the caller's location
2340 CompositeLocation callerLoc = new CompositeLocation();
2341 CompositeLocation callerBaseLocation = args.get(0);
2343 for (int i = 0; i < callerBaseLocation.getSize(); i++) {
2344 callerLoc.addLocation(callerBaseLocation.get(i));
2346 for (int i = 1; i < declaredReturnLoc.getSize(); i++) {
2347 callerLoc.addLocation(declaredReturnLoc.get(i));
2351 // compute the highest possible location in caller's side
2352 assert paramIdx2paramType.keySet().size() == args.size();
2354 Set<CompositeLocation> inputGLB = new HashSet<CompositeLocation>();
2355 for (int i = 0; i < args.size(); i++) {
2356 int type = (paramIdx2paramType.get(new Integer(i))).intValue();
2357 CompositeLocation argLoc = args.get(i);
2358 if (type == PARAMISHIGHER || type == PARAMISSAME) {
2359 // return loc is equal to or lower than param
2360 inputGLB.add(argLoc);
2364 // compute GLB of arguments subset that are same or higher than return
2366 if (inputGLB.isEmpty()) {
2367 if (args.size() == 0) {
2370 CompositeLocation rtr =
2371 new CompositeLocation(Location.createTopLocation(args.get(0).get(0).getDescriptor()));
2374 CompositeLocation glb = CompositeLattice.calculateGLB(inputGLB, "");