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 declaredReturnLoc = md2ReturnLoc.get(md);
553 CompositeLocation returnValueLoc;
554 if (returnExp != null) {
556 checkLocationFromExpressionNode(md, nametable, returnExp, new CompositeLocation(),
559 // System.out.println("# RETURN VALUE LOC=" + returnValueLoc +
560 // " with constraint=" + constraint);
562 // TODO: do we need to check here?
563 // if this return statement is inside branch, return value has an implicit
564 // flow from conditional location
565 // if (constraint != null) {
566 // Set<CompositeLocation> inputGLB = new HashSet<CompositeLocation>();
567 // inputGLB.add(returnValueLoc);
568 // inputGLB.add(constraint);
570 // CompositeLattice.calculateGLB(inputGLB,
571 // generateErrorMessage(md.getClassDesc(), rn));
574 if (constraint != null) {
576 // Set<CompositeLocation> inputGLB = new HashSet<CompositeLocation>();
577 // inputGLB.add(returnValueLoc);
578 // inputGLB.add(constraint);
580 // CompositeLattice.calculateGLB(inputGLB,
581 // generateErrorMessage(md.getClassDesc(), rn));
583 // if (!returnValueLoc.get(returnValueLoc.getSize() - 1).isTop()) {
584 // if (!CompositeLattice.isGreaterThan(constraint, returnValueLoc,
585 // generateErrorMessage(md.getClassDesc(), rn))) {
586 // System.out.println("returnValueLoc.get(returnValueLoc.getSize() - 1).isTop()="
587 // + returnValueLoc.get(returnValueLoc.getSize() - 1).isTop());
588 // throw new Error("The value flow from " + constraint + " to " +
590 // + " does not respect location hierarchy on the assignment " +
592 // + " at " + md.getClassDesc().getSourceFileName() + "::" +
597 if (!CompositeLattice.isGreaterThan(constraint, declaredReturnLoc,
598 generateErrorMessage(md.getClassDesc(), rn))) {
599 throw new Error("The value flow from " + constraint + " to " + declaredReturnLoc
600 + " does not respect location hierarchy on the assignment " + rn.printNode(0)
601 + " at " + md.getClassDesc().getSourceFileName() + "::" + rn.getNumLine());
606 // check if return value is equal or higher than RETRUNLOC of method
607 // declaration annotation
610 CompositeLattice.compare(returnValueLoc, declaredReturnLoc, false,
611 generateErrorMessage(md.getClassDesc(), rn));
613 if (compareResult == ComparisonResult.LESS || compareResult == ComparisonResult.INCOMPARABLE) {
615 "Return value location is not equal or higher than the declaraed return location at "
616 + md.getClassDesc().getSourceFileName() + "::" + rn.getNumLine());
620 return new CompositeLocation();
623 private boolean hasOnlyLiteralValue(ExpressionNode en) {
624 if (en.kind() == Kind.LiteralNode) {
631 private CompositeLocation checkLocationFromLoopNode(MethodDescriptor md, SymbolTable nametable,
632 LoopNode ln, CompositeLocation constraint) {
634 ClassDescriptor cd = md.getClassDesc();
635 if (ln.getType() == LoopNode.WHILELOOP || ln.getType() == LoopNode.DOWHILELOOP) {
637 CompositeLocation condLoc =
638 checkLocationFromExpressionNode(md, nametable, ln.getCondition(),
639 new CompositeLocation(), constraint, false);
640 // addLocationType(ln.getCondition().getType(), (condLoc));
642 constraint = generateNewConstraint(constraint, condLoc);
643 checkLocationFromBlockNode(md, nametable, ln.getBody(), constraint);
645 return new CompositeLocation();
648 // check 'for loop' case
649 BlockNode bn = ln.getInitializer();
650 bn.getVarTable().setParent(nametable);
651 // need to check initialization node
652 // checkLocationFromBlockNode(md, bn.getVarTable(), bn, constraint);
653 for (int i = 0; i < bn.size(); i++) {
654 BlockStatementNode bsn = bn.get(i);
655 checkLocationFromBlockStatementNode(md, bn.getVarTable(), bsn, constraint);
658 // calculate glb location of condition and update statements
659 CompositeLocation condLoc =
660 checkLocationFromExpressionNode(md, bn.getVarTable(), ln.getCondition(),
661 new CompositeLocation(), constraint, false);
662 // addLocationType(ln.getCondition().getType(), condLoc);
664 constraint = generateNewConstraint(constraint, condLoc);
666 checkLocationFromBlockNode(md, bn.getVarTable(), ln.getUpdate(), constraint);
667 checkLocationFromBlockNode(md, bn.getVarTable(), ln.getBody(), constraint);
669 return new CompositeLocation();
675 private CompositeLocation checkLocationFromSubBlockNode(MethodDescriptor md,
676 SymbolTable nametable, SubBlockNode sbn, CompositeLocation constraint) {
677 CompositeLocation compLoc =
678 checkLocationFromBlockNode(md, nametable, sbn.getBlockNode(), constraint);
682 private CompositeLocation generateNewConstraint(CompositeLocation currentCon,
683 CompositeLocation newCon) {
685 if (currentCon == null) {
688 // compute GLB of current constraint and new constraint
689 Set<CompositeLocation> inputSet = new HashSet<CompositeLocation>();
690 inputSet.add(currentCon);
691 inputSet.add(newCon);
692 return CompositeLattice.calculateGLB(inputSet, "");
697 private CompositeLocation checkLocationFromIfStatementNode(MethodDescriptor md,
698 SymbolTable nametable, IfStatementNode isn, CompositeLocation constraint) {
700 CompositeLocation condLoc =
701 checkLocationFromExpressionNode(md, nametable, isn.getCondition(), new CompositeLocation(),
704 // addLocationType(isn.getCondition().getType(), condLoc);
705 constraint = generateNewConstraint(constraint, condLoc);
706 checkLocationFromBlockNode(md, nametable, isn.getTrueBlock(), constraint);
708 if (isn.getFalseBlock() != null) {
709 checkLocationFromBlockNode(md, nametable, isn.getFalseBlock(), constraint);
712 return new CompositeLocation();
715 private void checkOwnership(MethodDescriptor md, TreeNode tn, ExpressionNode srcExpNode) {
717 if (srcExpNode.kind() == Kind.NameNode || srcExpNode.kind() == Kind.FieldAccessNode) {
718 if (srcExpNode.getType().isPtr() && !srcExpNode.getType().isNull()) {
719 // first, check the linear type
720 // RHS reference should be owned by the current method
721 FieldDescriptor fd = getFieldDescriptorFromExpressionNode(srcExpNode);
725 isOwned = ((SSJavaType) srcExpNode.getType().getExtension()).isOwned();
728 isOwned = ssjava.isOwnedByMethod(md, fd);
732 "It is not allowed to create the reference alias from the reference not owned by the method at "
733 + generateErrorMessage(md.getClassDesc(), tn));
741 private CompositeLocation checkLocationFromDeclarationNode(MethodDescriptor md,
742 SymbolTable nametable, DeclarationNode dn, CompositeLocation constraint) {
744 VarDescriptor vd = dn.getVarDescriptor();
746 CompositeLocation destLoc = d2loc.get(vd);
748 if (dn.getExpression() != null) {
750 checkOwnership(md, dn, dn.getExpression());
752 CompositeLocation expressionLoc =
753 checkLocationFromExpressionNode(md, nametable, dn.getExpression(),
754 new CompositeLocation(), constraint, false);
755 // addTypeLocation(dn.getExpression().getType(), expressionLoc);
757 if (expressionLoc != null) {
759 // checking location order
760 if (!CompositeLattice.isGreaterThan(expressionLoc, destLoc,
761 generateErrorMessage(md.getClassDesc(), dn))) {
762 throw new Error("The value flow from " + expressionLoc + " to " + destLoc
763 + " does not respect location hierarchy on the assignment " + dn.printNode(0)
764 + " at " + md.getClassDesc().getSourceFileName() + "::" + dn.getNumLine());
767 return expressionLoc;
771 return new CompositeLocation();
777 private void checkDeclarationInSubBlockNode(MethodDescriptor md, SymbolTable nametable,
779 checkDeclarationInBlockNode(md, nametable, sbn.getBlockNode());
782 private CompositeLocation checkLocationFromBlockExpressionNode(MethodDescriptor md,
783 SymbolTable nametable, BlockExpressionNode ben, CompositeLocation constraint) {
785 CompositeLocation compLoc =
786 checkLocationFromExpressionNode(md, nametable, ben.getExpression(), null, constraint, false);
787 // addTypeLocation(ben.getExpression().getType(), compLoc);
791 private CompositeLocation checkLocationFromExpressionNode(MethodDescriptor md,
792 SymbolTable nametable, ExpressionNode en, CompositeLocation loc,
793 CompositeLocation constraint, boolean isLHS) {
795 CompositeLocation compLoc = null;
798 case Kind.AssignmentNode:
800 checkLocationFromAssignmentNode(md, nametable, (AssignmentNode) en, loc, constraint);
803 case Kind.FieldAccessNode:
805 checkLocationFromFieldAccessNode(md, nametable, (FieldAccessNode) en, loc, constraint);
809 compLoc = checkLocationFromNameNode(md, nametable, (NameNode) en, loc, constraint);
813 compLoc = checkLocationFromOpNode(md, nametable, (OpNode) en, constraint);
816 case Kind.CreateObjectNode:
817 compLoc = checkLocationFromCreateObjectNode(md, nametable, (CreateObjectNode) en);
820 case Kind.ArrayAccessNode:
822 checkLocationFromArrayAccessNode(md, nametable, (ArrayAccessNode) en, constraint, isLHS);
825 case Kind.LiteralNode:
826 compLoc = checkLocationFromLiteralNode(md, nametable, (LiteralNode) en, loc);
829 case Kind.MethodInvokeNode:
831 checkLocationFromMethodInvokeNode(md, nametable, (MethodInvokeNode) en, loc, constraint);
834 case Kind.TertiaryNode:
835 compLoc = checkLocationFromTertiaryNode(md, nametable, (TertiaryNode) en, constraint);
839 compLoc = checkLocationFromCastNode(md, nametable, (CastNode) en, constraint);
842 // case Kind.InstanceOfNode:
843 // checkInstanceOfNode(md, nametable, (InstanceOfNode) en, td);
846 // case Kind.ArrayInitializerNode:
847 // checkArrayInitializerNode(md, nametable, (ArrayInitializerNode) en,
851 // case Kind.ClassTypeNode:
852 // checkClassTypeNode(md, nametable, (ClassTypeNode) en, td);
855 // case Kind.OffsetNode:
856 // checkOffsetNode(md, nametable, (OffsetNode)en, td);
863 // addTypeLocation(en.getType(), compLoc);
868 private CompositeLocation checkLocationFromCastNode(MethodDescriptor md, SymbolTable nametable,
869 CastNode cn, CompositeLocation constraint) {
871 ExpressionNode en = cn.getExpression();
872 return checkLocationFromExpressionNode(md, nametable, en, new CompositeLocation(), constraint,
877 private CompositeLocation checkLocationFromTertiaryNode(MethodDescriptor md,
878 SymbolTable nametable, TertiaryNode tn, CompositeLocation constraint) {
879 ClassDescriptor cd = md.getClassDesc();
881 CompositeLocation condLoc =
882 checkLocationFromExpressionNode(md, nametable, tn.getCond(), new CompositeLocation(),
884 // addLocationType(tn.getCond().getType(), condLoc);
885 CompositeLocation trueLoc =
886 checkLocationFromExpressionNode(md, nametable, tn.getTrueExpr(), new CompositeLocation(),
888 // addLocationType(tn.getTrueExpr().getType(), trueLoc);
889 CompositeLocation falseLoc =
890 checkLocationFromExpressionNode(md, nametable, tn.getFalseExpr(), new CompositeLocation(),
892 // addLocationType(tn.getFalseExpr().getType(), falseLoc);
894 // locations from true/false branches can be TOP when there are only literal
896 // in this case, we don't need to check flow down rule!
898 // System.out.println("\n#tertiary cond=" + tn.getCond().printNode(0) +
899 // " Loc=" + condLoc);
900 // System.out.println("# true=" + tn.getTrueExpr().printNode(0) + " Loc=" +
902 // System.out.println("# false=" + tn.getFalseExpr().printNode(0) + " Loc="
905 // check if condLoc is higher than trueLoc & falseLoc
906 if (!trueLoc.get(0).isTop()
907 && !CompositeLattice.isGreaterThan(condLoc, trueLoc, generateErrorMessage(cd, tn))) {
909 "The location of the condition expression is lower than the true expression at "
910 + cd.getSourceFileName() + ":" + tn.getCond().getNumLine());
913 if (!falseLoc.get(0).isTop()
914 && !CompositeLattice.isGreaterThan(condLoc, falseLoc,
915 generateErrorMessage(cd, tn.getCond()))) {
917 "The location of the condition expression is lower than the false expression at "
918 + cd.getSourceFileName() + ":" + tn.getCond().getNumLine());
921 // then, return glb of trueLoc & falseLoc
922 Set<CompositeLocation> glbInputSet = new HashSet<CompositeLocation>();
923 glbInputSet.add(trueLoc);
924 glbInputSet.add(falseLoc);
926 if (glbInputSet.size() == 1) {
929 return CompositeLattice.calculateGLB(glbInputSet, generateErrorMessage(cd, tn));
934 private CompositeLocation checkLocationFromMethodInvokeNode(MethodDescriptor md,
935 SymbolTable nametable, MethodInvokeNode min, CompositeLocation loc,
936 CompositeLocation constraint) {
938 ClassDescriptor cd = md.getClassDesc();
939 MethodDescriptor calleeMethodDesc = min.getMethod();
941 NameDescriptor baseName = min.getBaseName();
942 boolean isSystemout = false;
943 if (baseName != null) {
944 isSystemout = baseName.getSymbol().equals("System.out");
947 if (!ssjava.isSSJavaUtil(calleeMethodDesc.getClassDesc())
948 && !ssjava.isTrustMethod(calleeMethodDesc) && !calleeMethodDesc.getModifiers().isNative()
951 CompositeLocation baseLocation = null;
952 if (min.getExpression() != null) {
954 checkLocationFromExpressionNode(md, nametable, min.getExpression(),
955 new CompositeLocation(), constraint, false);
957 if (min.getMethod().isStatic()) {
958 String globalLocId = ssjava.getMethodLattice(md).getGlobalLoc();
959 if (globalLocId == null) {
960 throw new Error("Method lattice does not define global variable location at "
961 + generateErrorMessage(md.getClassDesc(), min));
963 baseLocation = new CompositeLocation(new Location(md, globalLocId));
965 String thisLocId = ssjava.getMethodLattice(md).getThisLoc();
966 baseLocation = new CompositeLocation(new Location(md, thisLocId));
970 // System.out.println("\n#checkLocationFromMethodInvokeNode=" +
972 // + " baseLocation=" + baseLocation + " constraint=" + constraint);
974 // setup the location list of caller's arguments
975 List<CompositeLocation> callerArgList = new ArrayList<CompositeLocation>();
977 // setup the location list of callee's parameters
978 MethodLattice<String> calleeLattice = ssjava.getMethodLattice(calleeMethodDesc);
979 List<CompositeLocation> calleeParamList = new ArrayList<CompositeLocation>();
981 if (min.numArgs() > 0) {
982 if (!calleeMethodDesc.isStatic()) {
983 callerArgList.add(baseLocation);
985 for (int i = 0; i < min.numArgs(); i++) {
986 ExpressionNode en = min.getArg(i);
987 CompositeLocation callerArgLoc =
988 checkLocationFromExpressionNode(md, nametable, en, new CompositeLocation(),
990 callerArgList.add(callerArgLoc);
993 if (!calleeMethodDesc.isStatic()) {
994 CompositeLocation calleeThisLoc =
995 new CompositeLocation(new Location(calleeMethodDesc, calleeLattice.getThisLoc()));
996 calleeParamList.add(calleeThisLoc);
999 for (int i = 0; i < calleeMethodDesc.numParameters(); i++) {
1000 VarDescriptor calleevd = (VarDescriptor) calleeMethodDesc.getParameter(i);
1001 CompositeLocation calleeLoc = d2loc.get(calleevd);
1002 calleeParamList.add(calleeLoc);
1006 if (constraint != null) {
1007 // check whether the PC location is lower than one of the
1008 // argument locations. If it is lower, the callee has to have @PCLOC
1009 // annotation that declares the program counter that is higher than
1010 // corresponding parameter
1012 CompositeLocation calleePCLOC = ssjava.getPCLocation(calleeMethodDesc);
1014 for (int idx = 0; idx < callerArgList.size(); idx++) {
1015 CompositeLocation argLocation = callerArgList.get(idx);
1017 // need to check that param is higher than PCLOC
1018 if (!argLocation.get(0).isTop()
1019 && CompositeLattice.compare(argLocation, constraint, true,
1020 generateErrorMessage(cd, min)) == ComparisonResult.GREATER) {
1022 CompositeLocation paramLocation = calleeParamList.get(idx);
1024 int paramCompareResult =
1025 CompositeLattice.compare(calleePCLOC, paramLocation, true,
1026 generateErrorMessage(cd, min));
1028 if (paramCompareResult == ComparisonResult.GREATER) {
1030 "The program counter location "
1032 + " is lower than the argument(idx="
1036 + ". Need to specify that the initial PC location of the callee, which is currently set to "
1037 + calleePCLOC + ", is lower than " + paramLocation + " in the method "
1038 + calleeMethodDesc.getSymbol() + ":" + min.getNumLine());
1047 checkCalleeConstraints(md, nametable, min, baseLocation, constraint);
1049 // checkCallerArgumentLocationConstraints(md, nametable, min,
1050 // baseLocation, constraint);
1052 if (!min.getMethod().getReturnType().isVoid()) {
1053 // If method has a return value, compute the highest possible return
1054 // location in the caller's perspective
1055 CompositeLocation ceilingLoc =
1056 computeCeilingLocationForCaller(md, nametable, min, baseLocation, constraint);
1058 if (ceilingLoc == null) {
1059 return new CompositeLocation(Location.createTopLocation(md));
1065 return new CompositeLocation(Location.createTopLocation(md));
1069 private CompositeLocation translateCallerLocToCalleeLoc(MethodDescriptor calleeMD,
1070 CompositeLocation calleeBaseLoc, CompositeLocation constraint) {
1072 CompositeLocation calleeConstraint = new CompositeLocation();
1074 // if (constraint.startsWith(calleeBaseLoc)) {
1075 // if the first part of constraint loc is matched with callee base loc
1076 Location thisLoc = new Location(calleeMD, ssjava.getMethodLattice(calleeMD).getThisLoc());
1077 calleeConstraint.addLocation(thisLoc);
1078 for (int i = calleeBaseLoc.getSize(); i < constraint.getSize(); i++) {
1079 calleeConstraint.addLocation(constraint.get(i));
1084 return calleeConstraint;
1087 private void checkCallerArgumentLocationConstraints(MethodDescriptor md, SymbolTable nametable,
1088 MethodInvokeNode min, CompositeLocation callerBaseLoc, CompositeLocation constraint) {
1089 // if parameter location consists of THIS and FIELD location,
1090 // caller should pass an argument that is comparable to the declared
1091 // parameter location
1092 // and is not lower than the declared parameter location in the field
1095 MethodDescriptor calleemd = min.getMethod();
1097 List<CompositeLocation> callerArgList = new ArrayList<CompositeLocation>();
1098 List<CompositeLocation> calleeParamList = new ArrayList<CompositeLocation>();
1100 MethodLattice<String> calleeLattice = ssjava.getMethodLattice(calleemd);
1101 Location calleeThisLoc = new Location(calleemd, calleeLattice.getThisLoc());
1103 for (int i = 0; i < min.numArgs(); i++) {
1104 ExpressionNode en = min.getArg(i);
1105 CompositeLocation callerArgLoc =
1106 checkLocationFromExpressionNode(md, nametable, en, new CompositeLocation(), constraint,
1108 callerArgList.add(callerArgLoc);
1111 // setup callee params set
1112 for (int i = 0; i < calleemd.numParameters(); i++) {
1113 VarDescriptor calleevd = (VarDescriptor) calleemd.getParameter(i);
1114 CompositeLocation calleeLoc = d2loc.get(calleevd);
1115 calleeParamList.add(calleeLoc);
1118 String errorMsg = generateErrorMessage(md.getClassDesc(), min);
1120 // System.out.println("checkCallerArgumentLocationConstraints=" +
1121 // min.printNode(0));
1122 // System.out.println("base location=" + callerBaseLoc + " constraint=" +
1125 for (int i = 0; i < calleeParamList.size(); i++) {
1126 CompositeLocation calleeParamLoc = calleeParamList.get(i);
1127 if (calleeParamLoc.get(0).equals(calleeThisLoc) && calleeParamLoc.getSize() > 1) {
1129 // callee parameter location has field information
1130 CompositeLocation callerArgLoc = callerArgList.get(i);
1132 CompositeLocation paramLocation =
1133 translateCalleeParamLocToCaller(md, calleeParamLoc, callerBaseLoc, errorMsg);
1135 Set<CompositeLocation> inputGLBSet = new HashSet<CompositeLocation>();
1136 if (constraint != null) {
1137 inputGLBSet.add(callerArgLoc);
1138 inputGLBSet.add(constraint);
1140 CompositeLattice.calculateGLB(inputGLBSet,
1141 generateErrorMessage(md.getClassDesc(), min));
1144 if (!CompositeLattice.isGreaterThan(callerArgLoc, paramLocation, errorMsg)) {
1145 throw new Error("Caller argument '" + min.getArg(i).printNode(0) + " : " + callerArgLoc
1146 + "' should be higher than corresponding callee's parameter : " + paramLocation
1147 + " at " + errorMsg);
1155 private CompositeLocation translateCalleeParamLocToCaller(MethodDescriptor md,
1156 CompositeLocation calleeParamLoc, CompositeLocation callerBaseLocation, String errorMsg) {
1158 CompositeLocation translate = new CompositeLocation();
1160 for (int i = 0; i < callerBaseLocation.getSize(); i++) {
1161 translate.addLocation(callerBaseLocation.get(i));
1164 for (int i = 1; i < calleeParamLoc.getSize(); i++) {
1165 translate.addLocation(calleeParamLoc.get(i));
1168 // System.out.println("TRANSLATED=" + translate + " from calleeParamLoc=" +
1174 private CompositeLocation computeCeilingLocationForCaller(MethodDescriptor md,
1175 SymbolTable nametable, MethodInvokeNode min, CompositeLocation baseLocation,
1176 CompositeLocation constraint) {
1177 List<CompositeLocation> argList = new ArrayList<CompositeLocation>();
1179 // by default, method has a THIS parameter
1180 if (!min.getMethod().isStatic()) {
1181 argList.add(baseLocation);
1184 for (int i = 0; i < min.numArgs(); i++) {
1185 ExpressionNode en = min.getArg(i);
1186 CompositeLocation callerArg =
1187 checkLocationFromExpressionNode(md, nametable, en, new CompositeLocation(), constraint,
1189 argList.add(callerArg);
1192 System.out.println("\n## computeReturnLocation=" + min.getMethod() + " argList=" + argList);
1193 CompositeLocation ceilLoc = md2ReturnLocGen.get(min.getMethod()).computeReturnLocation(argList);
1194 System.out.println("## ReturnLocation=" + ceilLoc);
1200 private void checkCalleeConstraints(MethodDescriptor md, SymbolTable nametable,
1201 MethodInvokeNode min, CompositeLocation callerBaseLoc, CompositeLocation constraint) {
1203 MethodDescriptor calleemd = min.getMethod();
1205 MethodLattice<String> calleeLattice = ssjava.getMethodLattice(calleemd);
1207 System.out.println("checkCalleeConstraints=" + calleemd + " calleeLattice.getThisLoc()="
1208 + calleeLattice.getThisLoc());
1210 CompositeLocation calleeThisLoc =
1211 new CompositeLocation(new Location(calleemd, calleeLattice.getThisLoc()));
1213 List<CompositeLocation> callerArgList = new ArrayList<CompositeLocation>();
1214 List<CompositeLocation> calleeParamList = new ArrayList<CompositeLocation>();
1216 if (min.numArgs() > 0) {
1217 // caller needs to guarantee that it passes arguments in regarding to
1218 // callee's hierarchy
1220 // setup caller args set
1221 // first, add caller's base(this) location
1222 if (!calleemd.isStatic())
1223 callerArgList.add(callerBaseLoc);
1224 // second, add caller's arguments
1225 for (int i = 0; i < min.numArgs(); i++) {
1226 ExpressionNode en = min.getArg(i);
1227 CompositeLocation callerArgLoc =
1228 checkLocationFromExpressionNode(md, nametable, en, new CompositeLocation(), constraint,
1230 callerArgList.add(callerArgLoc);
1233 // setup callee params set
1234 // first, add callee's this location
1235 if (!calleemd.isStatic())
1236 calleeParamList.add(calleeThisLoc);
1237 // second, add callee's parameters
1238 for (int i = 0; i < calleemd.numParameters(); i++) {
1239 VarDescriptor calleevd = (VarDescriptor) calleemd.getParameter(i);
1240 CompositeLocation calleeLoc = d2loc.get(calleevd);
1241 // System.out.println("calleevd=" + calleevd + " loc=" + calleeLoc);
1242 calleeParamList.add(calleeLoc);
1245 // here, check if ordering relations among caller's args respect
1246 // ordering relations in-between callee's args
1247 CHECK: for (int i = 0; i < calleeParamList.size(); i++) {
1248 CompositeLocation calleeLoc1 = calleeParamList.get(i);
1249 CompositeLocation callerLoc1 = callerArgList.get(i);
1251 for (int j = 0; j < calleeParamList.size(); j++) {
1253 CompositeLocation calleeLoc2 = calleeParamList.get(j);
1254 CompositeLocation callerLoc2 = callerArgList.get(j);
1256 if (callerLoc1.get(callerLoc1.getSize() - 1).isTop()
1257 || callerLoc2.get(callerLoc2.getSize() - 1).isTop()) {
1261 // System.out.println("calleeLoc1=" + calleeLoc1);
1262 // System.out.println("calleeLoc2=" + calleeLoc2 +
1263 // "calleeParamList=" + calleeParamList);
1266 CompositeLattice.compare(callerLoc1, callerLoc2, true,
1267 generateErrorMessage(md.getClassDesc(), min));
1268 // System.out.println("callerResult=" + callerResult);
1270 CompositeLattice.compare(calleeLoc1, calleeLoc2, true,
1271 generateErrorMessage(md.getClassDesc(), min));
1272 // System.out.println("calleeResult=" + calleeResult);
1274 if (callerResult == ComparisonResult.EQUAL) {
1275 if (ssjava.isSharedLocation(callerLoc1.get(callerLoc1.getSize() - 1))
1276 && ssjava.isSharedLocation(callerLoc2.get(callerLoc2.getSize() - 1))) {
1277 // if both of them are shared locations, promote them to
1278 // "GREATER relation"
1279 callerResult = ComparisonResult.GREATER;
1283 if (calleeResult == ComparisonResult.GREATER
1284 && callerResult != ComparisonResult.GREATER) {
1285 // If calleeLoc1 is higher than calleeLoc2
1286 // then, caller should have same ordering relation in-bet
1287 // callerLoc1 & callerLoc2
1289 String paramName1, paramName2;
1292 paramName1 = "'THIS'";
1294 paramName1 = "'parameter " + calleemd.getParamName(i - 1) + "'";
1298 paramName2 = "'THIS'";
1300 paramName2 = "'parameter " + calleemd.getParamName(j - 1) + "'";
1304 "Caller doesn't respect an ordering relation among method arguments: callee expects that "
1305 + paramName1 + " should be higher than " + paramName2 + " in " + calleemd
1306 + " at " + md.getClassDesc().getSourceFileName() + ":" + min.getNumLine());
1317 private CompositeLocation checkLocationFromArrayAccessNode(MethodDescriptor md,
1318 SymbolTable nametable, ArrayAccessNode aan, CompositeLocation constraint, boolean isLHS) {
1319 System.out.println("aan=" + aan.printNode(0) + " line#=" + aan.getNumLine());
1320 ClassDescriptor cd = md.getClassDesc();
1322 CompositeLocation arrayLoc =
1323 checkLocationFromExpressionNode(md, nametable, aan.getExpression(),
1324 new CompositeLocation(), constraint, isLHS);
1326 // addTypeLocation(aan.getExpression().getType(), arrayLoc);
1327 CompositeLocation indexLoc =
1328 checkLocationFromExpressionNode(md, nametable, aan.getIndex(), new CompositeLocation(),
1330 // addTypeLocation(aan.getIndex().getType(), indexLoc);
1333 if (!CompositeLattice.isGreaterThan(indexLoc, arrayLoc, generateErrorMessage(cd, aan))) {
1334 throw new Error("Array index value is not higher than array location at "
1335 + generateErrorMessage(cd, aan));
1339 Set<CompositeLocation> inputGLB = new HashSet<CompositeLocation>();
1340 inputGLB.add(arrayLoc);
1341 inputGLB.add(indexLoc);
1342 return CompositeLattice.calculateGLB(inputGLB, generateErrorMessage(cd, aan));
1347 private CompositeLocation checkLocationFromCreateObjectNode(MethodDescriptor md,
1348 SymbolTable nametable, CreateObjectNode con) {
1350 ClassDescriptor cd = md.getClassDesc();
1352 CompositeLocation compLoc = new CompositeLocation();
1353 compLoc.addLocation(Location.createTopLocation(md));
1358 private CompositeLocation checkLocationFromOpNode(MethodDescriptor md, SymbolTable nametable,
1359 OpNode on, CompositeLocation constraint) {
1361 ClassDescriptor cd = md.getClassDesc();
1362 CompositeLocation leftLoc = new CompositeLocation();
1364 checkLocationFromExpressionNode(md, nametable, on.getLeft(), leftLoc, constraint, false);
1365 // addTypeLocation(on.getLeft().getType(), leftLoc);
1367 CompositeLocation rightLoc = new CompositeLocation();
1368 if (on.getRight() != null) {
1370 checkLocationFromExpressionNode(md, nametable, on.getRight(), rightLoc, constraint, false);
1371 // addTypeLocation(on.getRight().getType(), rightLoc);
1374 // System.out.println("\n# OP NODE=" + on.printNode(0));
1375 // System.out.println("# left loc=" + leftLoc + " from " +
1376 // on.getLeft().getClass());
1377 // if (on.getRight() != null) {
1378 // System.out.println("# right loc=" + rightLoc + " from " +
1379 // on.getRight().getClass());
1382 Operation op = on.getOp();
1384 switch (op.getOp()) {
1386 case Operation.UNARYPLUS:
1387 case Operation.UNARYMINUS:
1388 case Operation.LOGIC_NOT:
1392 case Operation.LOGIC_OR:
1393 case Operation.LOGIC_AND:
1394 case Operation.COMP:
1395 case Operation.BIT_OR:
1396 case Operation.BIT_XOR:
1397 case Operation.BIT_AND:
1398 case Operation.ISAVAILABLE:
1399 case Operation.EQUAL:
1400 case Operation.NOTEQUAL:
1407 case Operation.MULT:
1410 case Operation.LEFTSHIFT:
1411 case Operation.RIGHTSHIFT:
1412 case Operation.URIGHTSHIFT:
1414 Set<CompositeLocation> inputSet = new HashSet<CompositeLocation>();
1415 inputSet.add(leftLoc);
1416 inputSet.add(rightLoc);
1417 CompositeLocation glbCompLoc =
1418 CompositeLattice.calculateGLB(inputSet, generateErrorMessage(cd, on));
1422 throw new Error(op.toString());
1427 private CompositeLocation checkLocationFromLiteralNode(MethodDescriptor md,
1428 SymbolTable nametable, LiteralNode en, CompositeLocation loc) {
1430 // literal value has the top location so that value can be flowed into any
1432 Location literalLoc = Location.createTopLocation(md);
1433 loc.addLocation(literalLoc);
1438 private CompositeLocation checkLocationFromNameNode(MethodDescriptor md, SymbolTable nametable,
1439 NameNode nn, CompositeLocation loc, CompositeLocation constraint) {
1441 NameDescriptor nd = nn.getName();
1442 if (nd.getBase() != null) {
1444 checkLocationFromExpressionNode(md, nametable, nn.getExpression(), loc, constraint, false);
1446 String varname = nd.toString();
1447 if (varname.equals("this")) {
1449 MethodLattice<String> methodLattice = ssjava.getMethodLattice(md);
1450 String thisLocId = methodLattice.getThisLoc();
1451 if (thisLocId == null) {
1452 throw new Error("The location for 'this' is not defined at "
1453 + md.getClassDesc().getSourceFileName() + "::" + nn.getNumLine());
1455 Location locElement = new Location(md, thisLocId);
1456 loc.addLocation(locElement);
1461 Descriptor d = (Descriptor) nametable.get(varname);
1463 // CompositeLocation localLoc = null;
1464 if (d instanceof VarDescriptor) {
1465 VarDescriptor vd = (VarDescriptor) d;
1466 // localLoc = d2loc.get(vd);
1467 // the type of var descriptor has a composite location!
1468 loc = ((SSJavaType) vd.getType().getExtension()).getCompLoc().clone();
1469 } else if (d instanceof FieldDescriptor) {
1470 // the type of field descriptor has a location!
1471 FieldDescriptor fd = (FieldDescriptor) d;
1472 if (fd.isStatic()) {
1474 // if it is 'static final', the location has TOP since no one can
1476 loc.addLocation(Location.createTopLocation(md));
1479 // if 'static', the location has pre-assigned global loc
1480 MethodLattice<String> localLattice = ssjava.getMethodLattice(md);
1481 String globalLocId = localLattice.getGlobalLoc();
1482 if (globalLocId == null) {
1483 throw new Error("Global location element is not defined in the method " + md);
1485 Location globalLoc = new Location(md, globalLocId);
1487 loc.addLocation(globalLoc);
1490 // the location of field access starts from this, followed by field
1492 MethodLattice<String> localLattice = ssjava.getMethodLattice(md);
1493 Location thisLoc = new Location(md, localLattice.getThisLoc());
1494 loc.addLocation(thisLoc);
1497 Location fieldLoc = (Location) fd.getType().getExtension();
1498 loc.addLocation(fieldLoc);
1499 } else if (d == null) {
1500 // access static field
1501 FieldDescriptor fd = nn.getField();
1503 MethodLattice<String> localLattice = ssjava.getMethodLattice(md);
1504 String globalLocId = localLattice.getGlobalLoc();
1505 if (globalLocId == null) {
1506 throw new Error("Method lattice does not define global variable location at "
1507 + generateErrorMessage(md.getClassDesc(), nn));
1509 loc.addLocation(new Location(md, globalLocId));
1511 Location fieldLoc = (Location) fd.getType().getExtension();
1512 loc.addLocation(fieldLoc);
1521 private CompositeLocation checkLocationFromFieldAccessNode(MethodDescriptor md,
1522 SymbolTable nametable, FieldAccessNode fan, CompositeLocation loc,
1523 CompositeLocation constraint) {
1525 ExpressionNode left = fan.getExpression();
1526 TypeDescriptor ltd = left.getType();
1528 FieldDescriptor fd = fan.getField();
1530 String varName = null;
1531 if (left.kind() == Kind.NameNode) {
1532 NameDescriptor nd = ((NameNode) left).getName();
1533 varName = nd.toString();
1536 if (ltd.isClassNameRef() || (varName != null && varName.equals("this"))) {
1537 // using a class name directly or access using this
1538 if (fd.isStatic() && fd.isFinal()) {
1539 loc.addLocation(Location.createTopLocation(md));
1544 Set<CompositeLocation> inputGLB = new HashSet<CompositeLocation>();
1545 if (left instanceof ArrayAccessNode) {
1546 ArrayAccessNode aan = (ArrayAccessNode) left;
1547 CompositeLocation indexLoc =
1548 checkLocationFromExpressionNode(md, nametable, aan.getIndex(), loc, constraint, false);
1549 inputGLB.add(indexLoc);
1552 loc = checkLocationFromExpressionNode(md, nametable, left, loc, constraint, false);
1554 if (!left.getType().isPrimitive()) {
1556 if (!fd.getSymbol().equals("length")) {
1557 // array.length access, return the location of the array
1558 Location fieldLoc = getFieldLocation(fd);
1559 loc.addLocation(fieldLoc);
1565 loc = CompositeLattice.calculateGLB(inputGLB, generateErrorMessage(md.getClassDesc(), fan));
1569 private Location getFieldLocation(FieldDescriptor fd) {
1571 // System.out.println("### getFieldLocation=" + fd);
1572 // System.out.println("### fd.getType().getExtension()=" +
1573 // fd.getType().getExtension());
1575 Location fieldLoc = (Location) fd.getType().getExtension();
1577 // handle the case that method annotation checking skips checking field
1579 if (fieldLoc == null) {
1580 fieldLoc = checkFieldDeclaration(fd.getClassDescriptor(), fd);
1587 private FieldDescriptor getFieldDescriptorFromExpressionNode(ExpressionNode en) {
1589 if (en.kind() == Kind.NameNode) {
1590 NameNode nn = (NameNode) en;
1591 if (nn.getField() != null) {
1592 return nn.getField();
1595 if (nn.getName() != null && nn.getName().getBase() != null) {
1596 return getFieldDescriptorFromExpressionNode(nn.getExpression());
1599 } else if (en.kind() == Kind.FieldAccessNode) {
1600 FieldAccessNode fan = (FieldAccessNode) en;
1601 return fan.getField();
1607 private CompositeLocation checkLocationFromAssignmentNode(MethodDescriptor md,
1608 SymbolTable nametable, AssignmentNode an, CompositeLocation loc, CompositeLocation constraint) {
1609 ClassDescriptor cd = md.getClassDesc();
1611 Set<CompositeLocation> inputGLBSet = new HashSet<CompositeLocation>();
1613 boolean postinc = true;
1614 if (an.getOperation().getBaseOp() == null
1615 || (an.getOperation().getBaseOp().getOp() != Operation.POSTINC && an.getOperation()
1616 .getBaseOp().getOp() != Operation.POSTDEC))
1619 // if LHS is array access node, need to check if array index is higher
1620 // than array itself
1621 CompositeLocation destLocation =
1622 checkLocationFromExpressionNode(md, nametable, an.getDest(), new CompositeLocation(),
1625 CompositeLocation rhsLocation;
1626 CompositeLocation srcLocation;
1630 checkOwnership(md, an, an.getSrc());
1633 checkLocationFromExpressionNode(md, nametable, an.getSrc(), new CompositeLocation(),
1636 if (an.getOperation().getOp() >= 2 && an.getOperation().getOp() <= 12) {
1637 // if assignment contains OP+EQ operator, need to merge location types
1638 // of LHS & RHS into the RHS
1639 Set<CompositeLocation> srcGLBSet = new HashSet<CompositeLocation>();
1640 srcGLBSet.add(rhsLocation);
1641 srcGLBSet.add(destLocation);
1642 srcLocation = CompositeLattice.calculateGLB(srcGLBSet, generateErrorMessage(cd, an));
1644 srcLocation = rhsLocation;
1647 if (constraint != null) {
1649 if (!CompositeLattice.isGreaterThan(constraint, destLocation, generateErrorMessage(cd, an))) {
1650 throw new Error("The value flow from " + constraint + " to " + destLocation
1651 + " does not respect location hierarchy on the assignment " + an.printNode(0)
1652 + " at " + cd.getSourceFileName() + "::" + an.getNumLine());
1654 // inputGLBSet.add(srcLocation);
1655 // inputGLBSet.add(constraint);
1656 // srcLocation = CompositeLattice.calculateGLB(inputGLBSet,
1657 // generateErrorMessage(cd, an));
1660 System.out.println("src=" + srcLocation + " dest=" + destLocation + " const=" + constraint);
1662 if (!CompositeLattice.isGreaterThan(srcLocation, destLocation, generateErrorMessage(cd, an))) {
1664 String context = "";
1665 if (constraint != null) {
1666 context = " and the current context constraint is " + constraint;
1669 throw new Error("The value flow from " + srcLocation + " to " + destLocation
1670 + " does not respect location hierarchy on the assignment " + an.printNode(0) + context
1671 + " at " + cd.getSourceFileName() + "::" + an.getNumLine());
1674 if (srcLocation.equals(destLocation)) {
1675 // keep it for definitely written analysis
1676 Set<FlatNode> flatNodeSet = ssjava.getBuildFlat().getFlatNodeSet(an);
1677 for (Iterator iterator = flatNodeSet.iterator(); iterator.hasNext();) {
1678 FlatNode fn = (FlatNode) iterator.next();
1679 ssjava.addSameHeightWriteFlatNode(fn);
1687 checkLocationFromExpressionNode(md, nametable, an.getDest(), new CompositeLocation(),
1690 if (constraint != null) {
1692 if (!CompositeLattice.isGreaterThan(constraint, destLocation, generateErrorMessage(cd, an))) {
1693 throw new Error("The value flow from " + constraint + " to " + destLocation
1694 + " does not respect location hierarchy on the assignment " + an.printNode(0)
1695 + " at " + cd.getSourceFileName() + "::" + an.getNumLine());
1697 // inputGLBSet.add(rhsLocation);
1698 // inputGLBSet.add(constraint);
1699 // srcLocation = CompositeLattice.calculateGLB(inputGLBSet,
1700 // generateErrorMessage(cd, an));
1701 srcLocation = rhsLocation;
1703 srcLocation = rhsLocation;
1706 if (!CompositeLattice.isGreaterThan(srcLocation, destLocation, generateErrorMessage(cd, an))) {
1708 if (srcLocation.equals(destLocation)) {
1709 throw new Error("Location " + srcLocation
1710 + " is not allowed to have the value flow that moves within the same location at '"
1711 + an.printNode(0) + "' of " + cd.getSourceFileName() + "::" + an.getNumLine());
1713 throw new Error("The value flow from " + srcLocation + " to " + destLocation
1714 + " does not respect location hierarchy on the assignment " + an.printNode(0)
1715 + " at " + cd.getSourceFileName() + "::" + an.getNumLine());
1720 if (srcLocation.equals(destLocation)) {
1721 // keep it for definitely written analysis
1722 Set<FlatNode> flatNodeSet = ssjava.getBuildFlat().getFlatNodeSet(an);
1723 for (Iterator iterator = flatNodeSet.iterator(); iterator.hasNext();) {
1724 FlatNode fn = (FlatNode) iterator.next();
1725 ssjava.addSameHeightWriteFlatNode(fn);
1731 return destLocation;
1734 private void assignLocationOfVarDescriptor(VarDescriptor vd, MethodDescriptor md,
1735 SymbolTable nametable, TreeNode n) {
1737 ClassDescriptor cd = md.getClassDesc();
1738 Vector<AnnotationDescriptor> annotationVec = vd.getType().getAnnotationMarkers();
1740 // currently enforce every variable to have corresponding location
1741 if (annotationVec.size() == 0) {
1742 throw new Error("Location is not assigned to variable '" + vd.getSymbol()
1743 + "' in the method '" + md + "' of the class " + cd.getSymbol() + " at "
1744 + generateErrorMessage(cd, n));
1747 int locDecCount = 0;
1748 for (int i = 0; i < annotationVec.size(); i++) {
1749 AnnotationDescriptor ad = annotationVec.elementAt(i);
1751 if (ad.getType() == AnnotationDescriptor.SINGLE_ANNOTATION) {
1753 if (ad.getMarker().equals(SSJavaAnalysis.LOC)) {
1755 if (locDecCount > 1) {// variable can have at most one location
1756 throw new Error(vd.getSymbol() + " has more than one location declaration.");
1758 String locDec = ad.getValue(); // check if location is defined
1760 if (locDec.startsWith(SSJavaAnalysis.DELTA)) {
1761 DeltaLocation deltaLoc = parseDeltaDeclaration(md, n, locDec);
1762 d2loc.put(vd, deltaLoc);
1763 addLocationType(vd.getType(), deltaLoc);
1765 CompositeLocation compLoc = parseLocationDeclaration(md, n, locDec);
1767 Location lastElement = compLoc.get(compLoc.getSize() - 1);
1768 if (ssjava.isSharedLocation(lastElement)) {
1769 ssjava.mapSharedLocation2Descriptor(lastElement, vd);
1772 d2loc.put(vd, compLoc);
1773 addLocationType(vd.getType(), compLoc);
1782 private DeltaLocation parseDeltaDeclaration(MethodDescriptor md, TreeNode n, String locDec) {
1785 int dIdx = locDec.indexOf(SSJavaAnalysis.DELTA);
1788 int beginIdx = dIdx + 6;
1789 locDec = locDec.substring(beginIdx, locDec.length() - 1);
1790 dIdx = locDec.indexOf(SSJavaAnalysis.DELTA);
1793 CompositeLocation compLoc = parseLocationDeclaration(md, n, locDec);
1794 DeltaLocation deltaLoc = new DeltaLocation(compLoc, deltaCount);
1799 private Location parseFieldLocDeclaraton(String decl, String msg) throws Exception {
1801 int idx = decl.indexOf(".");
1803 String className = decl.substring(0, idx);
1804 String fieldName = decl.substring(idx + 1);
1806 className.replaceAll(" ", "");
1807 fieldName.replaceAll(" ", "");
1809 Descriptor d = state.getClassSymbolTable().get(className);
1812 // System.out.println("state.getClassSymbolTable()=" +
1813 // state.getClassSymbolTable());
1814 throw new Error("The class in the location declaration '" + decl + "' does not exist at "
1818 assert (d instanceof ClassDescriptor);
1819 SSJavaLattice<String> lattice = ssjava.getClassLattice((ClassDescriptor) d);
1820 if (!lattice.containsKey(fieldName)) {
1821 throw new Error("The location " + fieldName + " is not defined in the field lattice of '"
1822 + className + "' at " + msg);
1825 return new Location(d, fieldName);
1828 private CompositeLocation parseLocationDeclaration(MethodDescriptor md, TreeNode n, String locDec) {
1830 CompositeLocation compLoc = new CompositeLocation();
1832 StringTokenizer tokenizer = new StringTokenizer(locDec, ",");
1833 List<String> locIdList = new ArrayList<String>();
1834 while (tokenizer.hasMoreTokens()) {
1835 String locId = tokenizer.nextToken();
1836 locIdList.add(locId);
1839 // at least,one location element needs to be here!
1840 assert (locIdList.size() > 0);
1842 // assume that loc with idx 0 comes from the local lattice
1843 // loc with idx 1 comes from the field lattice
1845 String localLocId = locIdList.get(0);
1846 SSJavaLattice<String> localLattice = CompositeLattice.getLatticeByDescriptor(md);
1847 Location localLoc = new Location(md, localLocId);
1848 if (localLattice == null || (!localLattice.containsKey(localLocId))) {
1849 throw new Error("Location " + localLocId
1850 + " is not defined in the local variable lattice at "
1851 + md.getClassDesc().getSourceFileName() + "::" + (n != null ? n.getNumLine() : md) + ".");
1853 compLoc.addLocation(localLoc);
1855 for (int i = 1; i < locIdList.size(); i++) {
1856 String locName = locIdList.get(i);
1859 parseFieldLocDeclaraton(locName, generateErrorMessage(md.getClassDesc(), n));
1860 compLoc.addLocation(fieldLoc);
1861 } catch (Exception e) {
1862 throw new Error("The location declaration '" + locName + "' is wrong at "
1863 + generateErrorMessage(md.getClassDesc(), n));
1871 private void checkDeclarationNode(MethodDescriptor md, SymbolTable nametable, DeclarationNode dn) {
1872 VarDescriptor vd = dn.getVarDescriptor();
1873 assignLocationOfVarDescriptor(vd, md, nametable, dn);
1876 private void checkDeclarationInClass(ClassDescriptor cd) {
1877 // Check to see that fields are okay
1878 for (Iterator field_it = cd.getFields(); field_it.hasNext();) {
1879 FieldDescriptor fd = (FieldDescriptor) field_it.next();
1881 if (!(fd.isFinal() && fd.isStatic())) {
1882 checkFieldDeclaration(cd, fd);
1884 // for static final, assign top location by default
1885 Location loc = Location.createTopLocation(cd);
1886 addLocationType(fd.getType(), loc);
1891 private Location checkFieldDeclaration(ClassDescriptor cd, FieldDescriptor fd) {
1893 Vector<AnnotationDescriptor> annotationVec = fd.getType().getAnnotationMarkers();
1895 // currently enforce every field to have corresponding location
1896 if (annotationVec.size() == 0) {
1897 throw new Error("Location is not assigned to the field '" + fd.getSymbol()
1898 + "' of the class " + cd.getSymbol() + " at " + cd.getSourceFileName());
1901 if (annotationVec.size() > 1) {
1902 // variable can have at most one location
1903 throw new Error("Field " + fd.getSymbol() + " of class " + cd
1904 + " has more than one location.");
1907 AnnotationDescriptor ad = annotationVec.elementAt(0);
1908 Location loc = null;
1910 if (ad.getType() == AnnotationDescriptor.SINGLE_ANNOTATION) {
1911 if (ad.getMarker().equals(SSJavaAnalysis.LOC)) {
1912 String locationID = ad.getValue();
1913 // check if location is defined
1914 SSJavaLattice<String> lattice = ssjava.getClassLattice(cd);
1915 if (lattice == null || (!lattice.containsKey(locationID))) {
1916 throw new Error("Location " + locationID
1917 + " is not defined in the field lattice of class " + cd.getSymbol() + " at"
1918 + cd.getSourceFileName() + ".");
1920 loc = new Location(cd, locationID);
1922 if (ssjava.isSharedLocation(loc)) {
1923 ssjava.mapSharedLocation2Descriptor(loc, fd);
1926 addLocationType(fd.getType(), loc);
1934 private void addLocationType(TypeDescriptor type, CompositeLocation loc) {
1936 TypeExtension te = type.getExtension();
1939 ssType = (SSJavaType) te;
1940 ssType.setCompLoc(loc);
1942 ssType = new SSJavaType(loc);
1943 type.setExtension(ssType);
1948 private void addLocationType(TypeDescriptor type, Location loc) {
1950 type.setExtension(loc);
1954 static class CompositeLattice {
1956 public static boolean isGreaterThan(CompositeLocation loc1, CompositeLocation loc2, String msg) {
1958 // System.out.println("\nisGreaterThan=" + loc1 + " " + loc2 + " msg=" +
1960 int baseCompareResult = compareBaseLocationSet(loc1, loc2, true, false, msg);
1961 if (baseCompareResult == ComparisonResult.EQUAL) {
1962 if (compareDelta(loc1, loc2) == ComparisonResult.GREATER) {
1967 } else if (baseCompareResult == ComparisonResult.GREATER) {
1975 public static int compare(CompositeLocation loc1, CompositeLocation loc2, boolean ignore,
1978 // System.out.println("compare=" + loc1 + " " + loc2);
1979 int baseCompareResult = compareBaseLocationSet(loc1, loc2, false, ignore, msg);
1981 if (baseCompareResult == ComparisonResult.EQUAL) {
1982 return compareDelta(loc1, loc2);
1984 return baseCompareResult;
1989 private static int compareDelta(CompositeLocation dLoc1, CompositeLocation dLoc2) {
1991 int deltaCount1 = 0;
1992 int deltaCount2 = 0;
1993 if (dLoc1 instanceof DeltaLocation) {
1994 deltaCount1 = ((DeltaLocation) dLoc1).getNumDelta();
1997 if (dLoc2 instanceof DeltaLocation) {
1998 deltaCount2 = ((DeltaLocation) dLoc2).getNumDelta();
2000 if (deltaCount1 < deltaCount2) {
2001 return ComparisonResult.GREATER;
2002 } else if (deltaCount1 == deltaCount2) {
2003 return ComparisonResult.EQUAL;
2005 return ComparisonResult.LESS;
2010 private static int compareBaseLocationSet(CompositeLocation compLoc1,
2011 CompositeLocation compLoc2, boolean awareSharedLoc, boolean ignore, String msg) {
2013 // if compLoc1 is greater than compLoc2, return true
2014 // else return false;
2016 // compare one by one in according to the order of the tuple
2018 for (int i = 0; i < compLoc1.getSize(); i++) {
2019 Location loc1 = compLoc1.get(i);
2020 if (i >= compLoc2.getSize()) {
2022 return ComparisonResult.INCOMPARABLE;
2024 throw new Error("Failed to compare two locations of " + compLoc1 + " and " + compLoc2
2025 + " because they are not comparable at " + msg);
2028 Location loc2 = compLoc2.get(i);
2030 Descriptor descriptor = getCommonParentDescriptor(loc1, loc2, msg);
2031 SSJavaLattice<String> lattice = getLatticeByDescriptor(descriptor);
2033 // check if the shared location is appeared only at the end of the
2034 // composite location
2035 if (lattice.getSharedLocSet().contains(loc1.getLocIdentifier())) {
2036 if (i != (compLoc1.getSize() - 1)) {
2037 throw new Error("The shared location " + loc1.getLocIdentifier()
2038 + " cannot be appeared in the middle of composite location at" + msg);
2042 if (lattice.getSharedLocSet().contains(loc2.getLocIdentifier())) {
2043 if (i != (compLoc2.getSize() - 1)) {
2044 throw new Error("The shared location " + loc2.getLocIdentifier()
2045 + " cannot be appeared in the middle of composite location at " + msg);
2049 // if (!lattice1.equals(lattice2)) {
2050 // throw new Error("Failed to compare two locations of " + compLoc1 +
2051 // " and " + compLoc2
2052 // + " because they are not comparable at " + msg);
2055 if (loc1.getLocIdentifier().equals(loc2.getLocIdentifier())) {
2057 // check if the current location is the spinning location
2058 // note that the spinning location only can be appeared in the last
2059 // part of the composite location
2060 if (awareSharedLoc && numOfTie == compLoc1.getSize()
2061 && lattice.getSharedLocSet().contains(loc1.getLocIdentifier())) {
2062 return ComparisonResult.GREATER;
2065 } else if (lattice.isGreaterThan(loc1.getLocIdentifier(), loc2.getLocIdentifier())) {
2066 return ComparisonResult.GREATER;
2068 return ComparisonResult.LESS;
2073 if (numOfTie == compLoc1.getSize()) {
2075 if (numOfTie != compLoc2.getSize()) {
2078 return ComparisonResult.INCOMPARABLE;
2080 throw new Error("Failed to compare two locations of " + compLoc1 + " and " + compLoc2
2081 + " because they are not comparable at " + msg);
2086 return ComparisonResult.EQUAL;
2089 return ComparisonResult.LESS;
2093 public static CompositeLocation calculateGLB(Set<CompositeLocation> inputSet, String errMsg) {
2095 System.out.println("Calculating GLB=" + inputSet);
2096 CompositeLocation glbCompLoc = new CompositeLocation();
2098 // calculate GLB of the first(priority) element
2099 Set<String> priorityLocIdentifierSet = new HashSet<String>();
2100 Descriptor priorityDescriptor = null;
2102 Hashtable<String, Set<CompositeLocation>> locId2CompLocSet =
2103 new Hashtable<String, Set<CompositeLocation>>();
2104 // mapping from the priority loc ID to its full representation by the
2105 // composite location
2107 int maxTupleSize = 0;
2108 CompositeLocation maxCompLoc = null;
2110 Location prevPriorityLoc = null;
2111 for (Iterator iterator = inputSet.iterator(); iterator.hasNext();) {
2112 CompositeLocation compLoc = (CompositeLocation) iterator.next();
2113 if (compLoc.getSize() > maxTupleSize) {
2114 maxTupleSize = compLoc.getSize();
2115 maxCompLoc = compLoc;
2117 Location priorityLoc = compLoc.get(0);
2118 String priorityLocId = priorityLoc.getLocIdentifier();
2119 priorityLocIdentifierSet.add(priorityLocId);
2121 if (locId2CompLocSet.containsKey(priorityLocId)) {
2122 locId2CompLocSet.get(priorityLocId).add(compLoc);
2124 Set<CompositeLocation> newSet = new HashSet<CompositeLocation>();
2125 newSet.add(compLoc);
2126 locId2CompLocSet.put(priorityLocId, newSet);
2129 // check if priority location are coming from the same lattice
2130 if (priorityDescriptor == null) {
2131 priorityDescriptor = priorityLoc.getDescriptor();
2133 priorityDescriptor = getCommonParentDescriptor(priorityLoc, prevPriorityLoc, errMsg);
2135 prevPriorityLoc = priorityLoc;
2136 // else if (!priorityDescriptor.equals(priorityLoc.getDescriptor())) {
2137 // throw new Error("Failed to calculate GLB of " + inputSet
2138 // + " because they are from different lattices.");
2142 SSJavaLattice<String> locOrder = getLatticeByDescriptor(priorityDescriptor);
2143 String glbOfPriorityLoc = locOrder.getGLB(priorityLocIdentifierSet);
2144 glbCompLoc.addLocation(new Location(priorityDescriptor, glbOfPriorityLoc));
2145 Set<CompositeLocation> compSet = locId2CompLocSet.get(glbOfPriorityLoc);
2147 if (compSet == null) {
2148 // when GLB(x1,x2)!=x1 and !=x2 : GLB case 4
2149 // mean that the result is already lower than <x1,y1> and <x2,y2>
2150 // assign TOP to the rest of the location elements
2152 // in this case, do not take care about delta
2153 // CompositeLocation inputComp = inputSet.iterator().next();
2154 for (int i = 1; i < maxTupleSize; i++) {
2155 glbCompLoc.addLocation(Location.createTopLocation(maxCompLoc.get(i).getDescriptor()));
2159 // here find out composite location that has a maximum length tuple
2160 // if we have three input set: [A], [A,B], [A,B,C]
2161 // maximum length tuple will be [A,B,C]
2163 CompositeLocation maxFromCompSet = null;
2164 for (Iterator iterator = compSet.iterator(); iterator.hasNext();) {
2165 CompositeLocation c = (CompositeLocation) iterator.next();
2166 if (c.getSize() > max) {
2172 if (compSet.size() == 1) {
2173 // if GLB(x1,x2)==x1 or x2 : GLB case 2,3
2174 CompositeLocation comp = compSet.iterator().next();
2175 for (int i = 1; i < comp.getSize(); i++) {
2176 glbCompLoc.addLocation(comp.get(i));
2179 // if input location corresponding to glb is a delta, need to apply
2180 // delta to glb result
2181 if (comp instanceof DeltaLocation) {
2182 glbCompLoc = new DeltaLocation(glbCompLoc, 1);
2186 // when GLB(x1,x2)==x1 and x2 : GLB case 1
2187 // if more than one location shares the same priority GLB
2188 // need to calculate the rest of GLB loc
2190 // setup input set starting from the second tuple item
2191 Set<CompositeLocation> innerGLBInput = new HashSet<CompositeLocation>();
2192 for (Iterator iterator = compSet.iterator(); iterator.hasNext();) {
2193 CompositeLocation compLoc = (CompositeLocation) iterator.next();
2194 CompositeLocation innerCompLoc = new CompositeLocation();
2195 for (int idx = 1; idx < compLoc.getSize(); idx++) {
2196 innerCompLoc.addLocation(compLoc.get(idx));
2198 if (innerCompLoc.getSize() > 0) {
2199 innerGLBInput.add(innerCompLoc);
2203 if (innerGLBInput.size() > 0) {
2204 CompositeLocation innerGLB = CompositeLattice.calculateGLB(innerGLBInput, errMsg);
2205 for (int idx = 0; idx < innerGLB.getSize(); idx++) {
2206 glbCompLoc.addLocation(innerGLB.get(idx));
2210 // if input location corresponding to glb is a delta, need to apply
2211 // delta to glb result
2213 for (Iterator iterator = compSet.iterator(); iterator.hasNext();) {
2214 CompositeLocation compLoc = (CompositeLocation) iterator.next();
2215 if (compLoc instanceof DeltaLocation) {
2216 if (glbCompLoc.equals(compLoc)) {
2217 glbCompLoc = new DeltaLocation(glbCompLoc, 1);
2226 // System.out.println("GLB=" + glbCompLoc);
2231 static SSJavaLattice<String> getLatticeByDescriptor(Descriptor d) {
2233 SSJavaLattice<String> lattice = null;
2235 if (d instanceof ClassDescriptor) {
2236 lattice = ssjava.getCd2lattice().get(d);
2237 } else if (d instanceof MethodDescriptor) {
2238 if (ssjava.getMd2lattice().containsKey(d)) {
2239 lattice = ssjava.getMd2lattice().get(d);
2241 // use default lattice for the method
2242 lattice = ssjava.getCd2methodDefault().get(((MethodDescriptor) d).getClassDesc());
2249 static Descriptor getCommonParentDescriptor(Location loc1, Location loc2, String msg) {
2251 Descriptor d1 = loc1.getDescriptor();
2252 Descriptor d2 = loc2.getDescriptor();
2254 Descriptor descriptor;
2256 if (d1 instanceof ClassDescriptor && d2 instanceof ClassDescriptor) {
2258 if (d1.equals(d2)) {
2261 // identifying which one is parent class
2262 Set<Descriptor> d1SubClassesSet = ssjava.tu.getSubClasses((ClassDescriptor) d1);
2263 Set<Descriptor> d2SubClassesSet = ssjava.tu.getSubClasses((ClassDescriptor) d2);
2265 if (d1 == null && d2 == null) {
2266 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2267 + " because they are not comparable at " + msg);
2268 } else if (d1SubClassesSet != null && d1SubClassesSet.contains(d2)) {
2270 } else if (d2SubClassesSet != null && d2SubClassesSet.contains(d1)) {
2273 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2274 + " because they are not comparable at " + msg);
2278 } else if (d1 instanceof MethodDescriptor && d2 instanceof MethodDescriptor) {
2280 if (d1.equals(d2)) {
2284 // identifying which one is parent class
2285 MethodDescriptor md1 = (MethodDescriptor) d1;
2286 MethodDescriptor md2 = (MethodDescriptor) d2;
2288 if (!md1.matches(md2)) {
2289 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2290 + " because they are not comparable at " + msg);
2293 Set<Descriptor> d1SubClassesSet =
2294 ssjava.tu.getSubClasses(((MethodDescriptor) d1).getClassDesc());
2295 Set<Descriptor> d2SubClassesSet =
2296 ssjava.tu.getSubClasses(((MethodDescriptor) d2).getClassDesc());
2298 if (d1 == null && d2 == null) {
2299 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2300 + " because they are not comparable at " + msg);
2301 } else if (d1 != null && d1SubClassesSet.contains(d2)) {
2303 } else if (d2 != null && d2SubClassesSet.contains(d1)) {
2306 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2307 + " because they are not comparable at " + msg);
2312 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2313 + " because they are not comparable at " + msg);
2322 class ComparisonResult {
2324 public static final int GREATER = 0;
2325 public static final int EQUAL = 1;
2326 public static final int LESS = 2;
2327 public static final int INCOMPARABLE = 3;
2334 class ReturnLocGenerator {
2336 public static final int PARAMISHIGHER = 0;
2337 public static final int PARAMISSAME = 1;
2338 public static final int IGNORE = 2;
2340 private Hashtable<Integer, Integer> paramIdx2paramType;
2342 private CompositeLocation declaredReturnLoc = null;
2344 public ReturnLocGenerator(CompositeLocation returnLoc, MethodDescriptor md,
2345 List<CompositeLocation> params, String msg) {
2347 CompositeLocation thisLoc = params.get(0);
2348 if (returnLoc.get(0).equals(thisLoc.get(0)) && returnLoc.getSize() > 1) {
2349 // if the declared return location consists of THIS and field location,
2350 // return location for the caller's side has to have same field element
2351 this.declaredReturnLoc = returnLoc;
2353 // creating mappings
2354 paramIdx2paramType = new Hashtable<Integer, Integer>();
2355 for (int i = 0; i < params.size(); i++) {
2356 CompositeLocation param = params.get(i);
2357 int compareResult = CompositeLattice.compare(param, returnLoc, true, msg);
2360 if (compareResult == ComparisonResult.GREATER) {
2362 } else if (compareResult == ComparisonResult.EQUAL) {
2367 paramIdx2paramType.put(new Integer(i), new Integer(type));
2373 public CompositeLocation computeReturnLocation(List<CompositeLocation> args) {
2375 if (declaredReturnLoc != null) {
2376 // when developer specify that the return value is [THIS,field]
2377 // needs to translate to the caller's location
2378 CompositeLocation callerLoc = new CompositeLocation();
2379 CompositeLocation callerBaseLocation = args.get(0);
2381 for (int i = 0; i < callerBaseLocation.getSize(); i++) {
2382 callerLoc.addLocation(callerBaseLocation.get(i));
2384 for (int i = 1; i < declaredReturnLoc.getSize(); i++) {
2385 callerLoc.addLocation(declaredReturnLoc.get(i));
2389 // compute the highest possible location in caller's side
2390 assert paramIdx2paramType.keySet().size() == args.size();
2392 Set<CompositeLocation> inputGLB = new HashSet<CompositeLocation>();
2393 for (int i = 0; i < args.size(); i++) {
2394 int type = (paramIdx2paramType.get(new Integer(i))).intValue();
2395 CompositeLocation argLoc = args.get(i);
2396 if (type == PARAMISHIGHER || type == PARAMISSAME) {
2397 // return loc is equal to or lower than param
2398 inputGLB.add(argLoc);
2402 // compute GLB of arguments subset that are same or higher than return
2404 if (inputGLB.isEmpty()) {
2405 if (args.size() == 0) {
2408 CompositeLocation rtr =
2409 new CompositeLocation(Location.createTopLocation(args.get(0).get(0).getDescriptor()));
2412 CompositeLocation glb = CompositeLattice.calculateGLB(inputGLB, "");