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.VarDescriptor;
27 import IR.Tree.ArrayAccessNode;
28 import IR.Tree.AssignmentNode;
29 import IR.Tree.BlockExpressionNode;
30 import IR.Tree.BlockNode;
31 import IR.Tree.BlockStatementNode;
32 import IR.Tree.CastNode;
33 import IR.Tree.CreateObjectNode;
34 import IR.Tree.DeclarationNode;
35 import IR.Tree.ExpressionNode;
36 import IR.Tree.FieldAccessNode;
37 import IR.Tree.IfStatementNode;
39 import IR.Tree.LiteralNode;
40 import IR.Tree.LoopNode;
41 import IR.Tree.MethodInvokeNode;
42 import IR.Tree.NameNode;
43 import IR.Tree.OpNode;
44 import IR.Tree.ReturnNode;
45 import IR.Tree.SubBlockNode;
46 import IR.Tree.SwitchBlockNode;
47 import IR.Tree.SwitchStatementNode;
48 import IR.Tree.SynchronizedNode;
49 import IR.Tree.TertiaryNode;
50 import IR.Tree.TreeNode;
53 public class FlowDownCheck {
56 static SSJavaAnalysis ssjava;
58 Set<ClassDescriptor> toanalyze;
59 List<ClassDescriptor> toanalyzeList;
61 Set<MethodDescriptor> toanalyzeMethod;
62 List<MethodDescriptor> toanalyzeMethodList;
64 // mapping from 'descriptor' to 'composite location'
65 Hashtable<Descriptor, CompositeLocation> d2loc;
67 Hashtable<MethodDescriptor, CompositeLocation> md2ReturnLoc;
68 Hashtable<MethodDescriptor, ReturnLocGenerator> md2ReturnLocGen;
70 // mapping from 'locID' to 'class descriptor'
71 Hashtable<String, ClassDescriptor> fieldLocName2cd;
73 boolean deterministic = true;
75 public FlowDownCheck(SSJavaAnalysis ssjava, State state) {
79 this.toanalyzeList = new ArrayList<ClassDescriptor>();
81 this.toanalyze = new HashSet<ClassDescriptor>();
84 this.toanalyzeMethodList = new ArrayList<MethodDescriptor>();
86 this.toanalyzeMethod = new HashSet<MethodDescriptor>();
88 this.d2loc = new Hashtable<Descriptor, CompositeLocation>();
89 this.fieldLocName2cd = new Hashtable<String, ClassDescriptor>();
90 this.md2ReturnLoc = new Hashtable<MethodDescriptor, CompositeLocation>();
91 this.md2ReturnLocGen = new Hashtable<MethodDescriptor, ReturnLocGenerator>();
96 // construct mapping from the location name to the class descriptor
97 // assume that the location name is unique through the whole program
99 Set<ClassDescriptor> cdSet = ssjava.getCd2lattice().keySet();
100 for (Iterator iterator = cdSet.iterator(); iterator.hasNext();) {
101 ClassDescriptor cd = (ClassDescriptor) iterator.next();
102 SSJavaLattice<String> lattice = ssjava.getCd2lattice().get(cd);
103 Set<String> fieldLocNameSet = lattice.getKeySet();
105 for (Iterator iterator2 = fieldLocNameSet.iterator(); iterator2.hasNext();) {
106 String fieldLocName = (String) iterator2.next();
107 fieldLocName2cd.put(fieldLocName, cd);
114 public boolean toAnalyzeIsEmpty() {
116 return toanalyzeList.isEmpty();
118 return toanalyze.isEmpty();
122 public ClassDescriptor toAnalyzeNext() {
124 return toanalyzeList.remove(0);
126 ClassDescriptor cd = toanalyze.iterator().next();
127 toanalyze.remove(cd);
132 public void setupToAnalyze() {
133 SymbolTable classtable = state.getClassSymbolTable();
135 toanalyzeList.clear();
136 toanalyzeList.addAll(classtable.getValueSet());
137 Collections.sort(toanalyzeList, new Comparator<ClassDescriptor>() {
138 public int compare(ClassDescriptor o1, ClassDescriptor o2) {
139 return o1.getClassName().compareToIgnoreCase(o2.getClassName());
144 toanalyze.addAll(classtable.getValueSet());
148 public void setupToAnalazeMethod(ClassDescriptor cd) {
150 SymbolTable methodtable = cd.getMethodTable();
152 toanalyzeMethodList.clear();
153 toanalyzeMethodList.addAll(methodtable.getValueSet());
154 Collections.sort(toanalyzeMethodList, new Comparator<MethodDescriptor>() {
155 public int compare(MethodDescriptor o1, MethodDescriptor o2) {
156 return o1.getSymbol().compareToIgnoreCase(o2.getSymbol());
160 toanalyzeMethod.clear();
161 toanalyzeMethod.addAll(methodtable.getValueSet());
165 public boolean toAnalyzeMethodIsEmpty() {
167 return toanalyzeMethodList.isEmpty();
169 return toanalyzeMethod.isEmpty();
173 public MethodDescriptor toAnalyzeMethodNext() {
175 return toanalyzeMethodList.remove(0);
177 MethodDescriptor md = toanalyzeMethod.iterator().next();
178 toanalyzeMethod.remove(md);
183 public void flowDownCheck() {
185 // phase 1 : checking declaration node and creating mapping of 'type
186 // desciptor' & 'location'
189 while (!toAnalyzeIsEmpty()) {
190 ClassDescriptor cd = toAnalyzeNext();
192 if (ssjava.needToBeAnnoated(cd)) {
194 ClassDescriptor superDesc = cd.getSuperDesc();
196 if (superDesc != null && (!superDesc.getSymbol().equals("Object"))) {
197 checkOrderingInheritance(superDesc, cd);
200 checkDeclarationInClass(cd);
202 setupToAnalazeMethod(cd);
203 while (!toAnalyzeMethodIsEmpty()) {
204 MethodDescriptor md = toAnalyzeMethodNext();
205 if (ssjava.needTobeAnnotated(md)) {
206 checkDeclarationInMethodBody(cd, md);
214 // phase2 : checking assignments
217 while (!toAnalyzeIsEmpty()) {
218 ClassDescriptor cd = toAnalyzeNext();
220 setupToAnalazeMethod(cd);
221 while (!toAnalyzeMethodIsEmpty()) {
222 MethodDescriptor md = toAnalyzeMethodNext();
223 if (ssjava.needTobeAnnotated(md)) {
224 System.out.println("SSJAVA: Checking assignments: " + md);
225 checkMethodBody(cd, md, null);
232 private void checkOrderingInheritance(ClassDescriptor superCd, ClassDescriptor cd) {
233 // here, we're going to check that sub class keeps same relative orderings
234 // in respect to super class
236 SSJavaLattice<String> superLattice = ssjava.getClassLattice(superCd);
237 SSJavaLattice<String> subLattice = ssjava.getClassLattice(cd);
239 if (superLattice != null) {
240 // if super class doesn't define lattice, then we don't need to check its
242 if (subLattice == null) {
243 throw new Error("If a parent class '" + superCd
244 + "' has a ordering lattice, its subclass '" + cd + "' should have one.");
247 Set<Pair<String, String>> superPairSet = superLattice.getOrderingPairSet();
248 Set<Pair<String, String>> subPairSet = subLattice.getOrderingPairSet();
250 for (Iterator iterator = superPairSet.iterator(); iterator.hasNext();) {
251 Pair<String, String> pair = (Pair<String, String>) iterator.next();
253 if (!subPairSet.contains(pair)) {
254 throw new Error("Subclass '" + cd + "' does not have the relative ordering '"
255 + pair.getSecond() + " < " + pair.getFirst()
256 + "' that is defined by its superclass '" + superCd + "'.");
261 MethodLattice<String> superMethodDefaultLattice = ssjava.getMethodDefaultLattice(superCd);
262 MethodLattice<String> subMethodDefaultLattice = ssjava.getMethodDefaultLattice(cd);
264 if (superMethodDefaultLattice != null) {
265 if (subMethodDefaultLattice == null) {
266 throw new Error("When a parent class '" + superCd
267 + "' defines a default method lattice, its subclass '" + cd + "' should define one.");
270 Set<Pair<String, String>> superPairSet = superMethodDefaultLattice.getOrderingPairSet();
271 Set<Pair<String, String>> subPairSet = subMethodDefaultLattice.getOrderingPairSet();
273 for (Iterator iterator = superPairSet.iterator(); iterator.hasNext();) {
274 Pair<String, String> pair = (Pair<String, String>) iterator.next();
276 if (!subPairSet.contains(pair)) {
277 throw new Error("Subclass '" + cd + "' does not have the relative ordering '"
278 + pair.getSecond() + " < " + pair.getFirst()
279 + "' that is defined by its superclass '" + superCd
280 + "' in the method default lattice.");
288 public Hashtable getMap() {
292 private void checkDeclarationInMethodBody(ClassDescriptor cd, MethodDescriptor md) {
293 BlockNode bn = state.getMethodBody(md);
295 System.out.println("\n#checkDeclarationInMethodBody=" + md);
297 // first, check annotations on method parameters
298 List<CompositeLocation> paramList = new ArrayList<CompositeLocation>();
299 for (int i = 0; i < md.numParameters(); i++) {
300 // process annotations on method parameters
301 VarDescriptor vd = (VarDescriptor) md.getParameter(i);
302 assignLocationOfVarDescriptor(vd, md, md.getParameterTable(), null);
303 paramList.add(d2loc.get(vd));
305 Vector<AnnotationDescriptor> methodAnnotations = md.getModifiers().getAnnotations();
307 // second, check return location annotation
308 if (!md.getReturnType().isVoid()) {
309 CompositeLocation returnLocComp = null;
311 boolean hasReturnLocDeclaration = false;
312 if (methodAnnotations != null) {
313 for (int i = 0; i < methodAnnotations.size(); i++) {
314 AnnotationDescriptor an = methodAnnotations.elementAt(i);
315 if (an.getMarker().equals(ssjava.RETURNLOC)) {
316 // this case, developer explicitly defines method lattice
317 String returnLocDeclaration = an.getValue();
318 returnLocComp = parseLocationDeclaration(md, null, returnLocDeclaration);
319 hasReturnLocDeclaration = true;
324 if (!hasReturnLocDeclaration) {
325 // if developer does not define method lattice
326 // search return location in the method default lattice
327 String rtrStr = ssjava.getMethodLattice(md).getReturnLoc();
328 if (rtrStr != null) {
329 returnLocComp = new CompositeLocation(new Location(md, rtrStr));
333 if (returnLocComp == null) {
334 throw new Error("Return location is not specified for the method " + md + " at "
335 + cd.getSourceFileName());
338 md2ReturnLoc.put(md, returnLocComp);
340 // check this location
341 MethodLattice<String> methodLattice = ssjava.getMethodLattice(md);
342 String thisLocId = methodLattice.getThisLoc();
343 if (thisLocId == null) {
344 throw new Error("Method '" + md + "' does not have the definition of 'this' location at "
345 + md.getClassDesc().getSourceFileName());
347 CompositeLocation thisLoc = new CompositeLocation(new Location(md, thisLocId));
348 paramList.add(0, thisLoc);
350 System.out.println("### ReturnLocGenerator=" + md);
351 System.out.println("### md2ReturnLoc.get(md)=" + md2ReturnLoc.get(md));
353 md2ReturnLocGen.put(md, new ReturnLocGenerator(md2ReturnLoc.get(md), md, paramList, md
354 + " of " + cd.getSourceFileName()));
357 // fourth, check declarations inside of method
359 checkDeclarationInBlockNode(md, md.getParameterTable(), bn);
363 private void checkDeclarationInBlockNode(MethodDescriptor md, SymbolTable nametable, BlockNode bn) {
364 bn.getVarTable().setParent(nametable);
365 for (int i = 0; i < bn.size(); i++) {
366 BlockStatementNode bsn = bn.get(i);
367 checkDeclarationInBlockStatementNode(md, bn.getVarTable(), bsn);
371 private void checkDeclarationInBlockStatementNode(MethodDescriptor md, SymbolTable nametable,
372 BlockStatementNode bsn) {
374 switch (bsn.kind()) {
375 case Kind.SubBlockNode:
376 checkDeclarationInSubBlockNode(md, nametable, (SubBlockNode) bsn);
379 case Kind.DeclarationNode:
380 checkDeclarationNode(md, nametable, (DeclarationNode) bsn);
384 checkDeclarationInLoopNode(md, nametable, (LoopNode) bsn);
387 case Kind.IfStatementNode:
388 checkDeclarationInIfStatementNode(md, nametable, (IfStatementNode) bsn);
391 case Kind.SwitchStatementNode:
392 checkDeclarationInSwitchStatementNode(md, nametable, (SwitchStatementNode) bsn);
395 case Kind.SynchronizedNode:
396 checkDeclarationInSynchronizedNode(md, nametable, (SynchronizedNode) bsn);
402 private void checkDeclarationInSynchronizedNode(MethodDescriptor md, SymbolTable nametable,
403 SynchronizedNode sbn) {
404 checkDeclarationInBlockNode(md, nametable, sbn.getBlockNode());
407 private void checkDeclarationInSwitchStatementNode(MethodDescriptor md, SymbolTable nametable,
408 SwitchStatementNode ssn) {
409 BlockNode sbn = ssn.getSwitchBody();
410 for (int i = 0; i < sbn.size(); i++) {
411 SwitchBlockNode node = (SwitchBlockNode) sbn.get(i);
412 checkDeclarationInBlockNode(md, nametable, node.getSwitchBlockStatement());
416 private void checkDeclarationInIfStatementNode(MethodDescriptor md, SymbolTable nametable,
417 IfStatementNode isn) {
418 checkDeclarationInBlockNode(md, nametable, isn.getTrueBlock());
419 if (isn.getFalseBlock() != null)
420 checkDeclarationInBlockNode(md, nametable, isn.getFalseBlock());
423 private void checkDeclarationInLoopNode(MethodDescriptor md, SymbolTable nametable, LoopNode ln) {
425 if (ln.getType() == LoopNode.FORLOOP) {
426 // check for loop case
427 ClassDescriptor cd = md.getClassDesc();
428 BlockNode bn = ln.getInitializer();
429 for (int i = 0; i < bn.size(); i++) {
430 BlockStatementNode bsn = bn.get(i);
431 checkDeclarationInBlockStatementNode(md, nametable, bsn);
436 checkDeclarationInBlockNode(md, nametable, ln.getBody());
439 private void checkMethodBody(ClassDescriptor cd, MethodDescriptor md,
440 CompositeLocation constraints) {
441 BlockNode bn = state.getMethodBody(md);
442 checkLocationFromBlockNode(md, md.getParameterTable(), bn, constraints);
445 private String generateErrorMessage(ClassDescriptor cd, TreeNode tn) {
447 return cd.getSourceFileName() + "::" + tn.getNumLine();
449 return cd.getSourceFileName();
454 private CompositeLocation checkLocationFromBlockNode(MethodDescriptor md, SymbolTable nametable,
455 BlockNode bn, CompositeLocation constraint) {
457 bn.getVarTable().setParent(nametable);
458 for (int i = 0; i < bn.size(); i++) {
459 BlockStatementNode bsn = bn.get(i);
460 checkLocationFromBlockStatementNode(md, bn.getVarTable(), bsn, constraint);
462 return new CompositeLocation();
466 private CompositeLocation checkLocationFromBlockStatementNode(MethodDescriptor md,
467 SymbolTable nametable, BlockStatementNode bsn, CompositeLocation constraint) {
469 CompositeLocation compLoc = null;
470 switch (bsn.kind()) {
471 case Kind.BlockExpressionNode:
473 checkLocationFromBlockExpressionNode(md, nametable, (BlockExpressionNode) bsn, constraint);
476 case Kind.DeclarationNode:
477 compLoc = checkLocationFromDeclarationNode(md, nametable, (DeclarationNode) bsn, constraint);
480 case Kind.IfStatementNode:
481 compLoc = checkLocationFromIfStatementNode(md, nametable, (IfStatementNode) bsn, constraint);
485 compLoc = checkLocationFromLoopNode(md, nametable, (LoopNode) bsn, constraint);
488 case Kind.ReturnNode:
489 compLoc = checkLocationFromReturnNode(md, nametable, (ReturnNode) bsn, constraint);
492 case Kind.SubBlockNode:
493 compLoc = checkLocationFromSubBlockNode(md, nametable, (SubBlockNode) bsn, constraint);
496 case Kind.ContinueBreakNode:
497 compLoc = new CompositeLocation();
500 case Kind.SwitchStatementNode:
502 checkLocationFromSwitchStatementNode(md, nametable, (SwitchStatementNode) bsn, constraint);
508 private CompositeLocation checkLocationFromSwitchStatementNode(MethodDescriptor md,
509 SymbolTable nametable, SwitchStatementNode ssn, CompositeLocation constraint) {
511 ClassDescriptor cd = md.getClassDesc();
512 CompositeLocation condLoc =
513 checkLocationFromExpressionNode(md, nametable, ssn.getCondition(), new CompositeLocation(),
515 BlockNode sbn = ssn.getSwitchBody();
517 constraint = generateNewConstraint(constraint, condLoc);
519 for (int i = 0; i < sbn.size(); i++) {
520 checkLocationFromSwitchBlockNode(md, nametable, (SwitchBlockNode) sbn.get(i), constraint);
522 return new CompositeLocation();
525 private CompositeLocation checkLocationFromSwitchBlockNode(MethodDescriptor md,
526 SymbolTable nametable, SwitchBlockNode sbn, CompositeLocation constraint) {
528 CompositeLocation blockLoc =
529 checkLocationFromBlockNode(md, nametable, sbn.getSwitchBlockStatement(), constraint);
535 private CompositeLocation checkLocationFromReturnNode(MethodDescriptor md, SymbolTable nametable,
536 ReturnNode rn, CompositeLocation constraint) {
538 ExpressionNode returnExp = rn.getReturnExpression();
540 CompositeLocation returnValueLoc;
541 if (returnExp != null) {
543 checkLocationFromExpressionNode(md, nametable, returnExp, new CompositeLocation(),
546 // if this return statement is inside branch, return value has an implicit
547 // flow from conditional location
548 if (constraint != null) {
549 Set<CompositeLocation> inputGLB = new HashSet<CompositeLocation>();
550 inputGLB.add(returnValueLoc);
551 inputGLB.add(constraint);
553 CompositeLattice.calculateGLB(inputGLB, generateErrorMessage(md.getClassDesc(), rn));
556 // check if return value is equal or higher than RETRUNLOC of method
557 // declaration annotation
558 CompositeLocation declaredReturnLoc = md2ReturnLoc.get(md);
561 CompositeLattice.compare(returnValueLoc, declaredReturnLoc, false,
562 generateErrorMessage(md.getClassDesc(), rn));
564 if (compareResult == ComparisonResult.LESS || compareResult == ComparisonResult.INCOMPARABLE) {
566 "Return value location is not equal or higher than the declaraed return location at "
567 + md.getClassDesc().getSourceFileName() + "::" + rn.getNumLine());
571 return new CompositeLocation();
574 private boolean hasOnlyLiteralValue(ExpressionNode en) {
575 if (en.kind() == Kind.LiteralNode) {
582 private CompositeLocation checkLocationFromLoopNode(MethodDescriptor md, SymbolTable nametable,
583 LoopNode ln, CompositeLocation constraint) {
585 ClassDescriptor cd = md.getClassDesc();
586 if (ln.getType() == LoopNode.WHILELOOP || ln.getType() == LoopNode.DOWHILELOOP) {
588 CompositeLocation condLoc =
589 checkLocationFromExpressionNode(md, nametable, ln.getCondition(),
590 new CompositeLocation(), constraint, false);
591 // addLocationType(ln.getCondition().getType(), (condLoc));
593 constraint = generateNewConstraint(constraint, condLoc);
594 checkLocationFromBlockNode(md, nametable, ln.getBody(), constraint);
596 return new CompositeLocation();
599 // check 'for loop' case
600 BlockNode bn = ln.getInitializer();
601 bn.getVarTable().setParent(nametable);
603 // calculate glb location of condition and update statements
604 CompositeLocation condLoc =
605 checkLocationFromExpressionNode(md, bn.getVarTable(), ln.getCondition(),
606 new CompositeLocation(), constraint, false);
607 // addLocationType(ln.getCondition().getType(), condLoc);
609 constraint = generateNewConstraint(constraint, condLoc);
611 checkLocationFromBlockNode(md, bn.getVarTable(), ln.getUpdate(), constraint);
612 checkLocationFromBlockNode(md, bn.getVarTable(), ln.getBody(), constraint);
614 return new CompositeLocation();
620 private CompositeLocation checkLocationFromSubBlockNode(MethodDescriptor md,
621 SymbolTable nametable, SubBlockNode sbn, CompositeLocation constraint) {
622 CompositeLocation compLoc =
623 checkLocationFromBlockNode(md, nametable, sbn.getBlockNode(), constraint);
627 private CompositeLocation generateNewConstraint(CompositeLocation currentCon,
628 CompositeLocation newCon) {
630 if (currentCon == null) {
633 // compute GLB of current constraint and new constraint
634 Set<CompositeLocation> inputSet = new HashSet<CompositeLocation>();
635 inputSet.add(currentCon);
636 inputSet.add(newCon);
637 return CompositeLattice.calculateGLB(inputSet, "");
642 private CompositeLocation checkLocationFromIfStatementNode(MethodDescriptor md,
643 SymbolTable nametable, IfStatementNode isn, CompositeLocation constraint) {
645 CompositeLocation condLoc =
646 checkLocationFromExpressionNode(md, nametable, isn.getCondition(), new CompositeLocation(),
649 // addLocationType(isn.getCondition().getType(), condLoc);
651 constraint = generateNewConstraint(constraint, condLoc);
652 checkLocationFromBlockNode(md, nametable, isn.getTrueBlock(), constraint);
654 if (isn.getFalseBlock() != null) {
655 checkLocationFromBlockNode(md, nametable, isn.getFalseBlock(), constraint);
658 return new CompositeLocation();
661 private CompositeLocation checkLocationFromDeclarationNode(MethodDescriptor md,
662 SymbolTable nametable, DeclarationNode dn, CompositeLocation constraint) {
664 VarDescriptor vd = dn.getVarDescriptor();
666 CompositeLocation destLoc = d2loc.get(vd);
668 if (dn.getExpression() != null) {
669 CompositeLocation expressionLoc =
670 checkLocationFromExpressionNode(md, nametable, dn.getExpression(),
671 new CompositeLocation(), constraint, false);
672 // addTypeLocation(dn.getExpression().getType(), expressionLoc);
674 if (expressionLoc != null) {
675 // checking location order
676 if (!CompositeLattice.isGreaterThan(expressionLoc, destLoc,
677 generateErrorMessage(md.getClassDesc(), dn))) {
678 throw new Error("The value flow from " + expressionLoc + " to " + destLoc
679 + " does not respect location hierarchy on the assignment " + dn.printNode(0)
680 + " at " + md.getClassDesc().getSourceFileName() + "::" + dn.getNumLine());
683 return expressionLoc;
687 return new CompositeLocation();
693 private void checkDeclarationInSubBlockNode(MethodDescriptor md, SymbolTable nametable,
695 checkDeclarationInBlockNode(md, nametable.getParent(), sbn.getBlockNode());
698 private CompositeLocation checkLocationFromBlockExpressionNode(MethodDescriptor md,
699 SymbolTable nametable, BlockExpressionNode ben, CompositeLocation constraint) {
700 CompositeLocation compLoc =
701 checkLocationFromExpressionNode(md, nametable, ben.getExpression(), null, constraint, false);
702 // addTypeLocation(ben.getExpression().getType(), compLoc);
706 private CompositeLocation checkLocationFromExpressionNode(MethodDescriptor md,
707 SymbolTable nametable, ExpressionNode en, CompositeLocation loc,
708 CompositeLocation constraint, boolean isLHS) {
710 CompositeLocation compLoc = null;
713 case Kind.AssignmentNode:
715 checkLocationFromAssignmentNode(md, nametable, (AssignmentNode) en, loc, constraint);
718 case Kind.FieldAccessNode:
720 checkLocationFromFieldAccessNode(md, nametable, (FieldAccessNode) en, loc, constraint);
724 compLoc = checkLocationFromNameNode(md, nametable, (NameNode) en, loc, constraint);
728 compLoc = checkLocationFromOpNode(md, nametable, (OpNode) en, constraint);
731 case Kind.CreateObjectNode:
732 compLoc = checkLocationFromCreateObjectNode(md, nametable, (CreateObjectNode) en);
735 case Kind.ArrayAccessNode:
737 checkLocationFromArrayAccessNode(md, nametable, (ArrayAccessNode) en, constraint, isLHS);
740 case Kind.LiteralNode:
741 compLoc = checkLocationFromLiteralNode(md, nametable, (LiteralNode) en, loc);
744 case Kind.MethodInvokeNode:
746 checkLocationFromMethodInvokeNode(md, nametable, (MethodInvokeNode) en, loc, constraint);
749 case Kind.TertiaryNode:
750 compLoc = checkLocationFromTertiaryNode(md, nametable, (TertiaryNode) en, constraint);
754 compLoc = checkLocationFromCastNode(md, nametable, (CastNode) en, constraint);
757 // case Kind.InstanceOfNode:
758 // checkInstanceOfNode(md, nametable, (InstanceOfNode) en, td);
761 // case Kind.ArrayInitializerNode:
762 // checkArrayInitializerNode(md, nametable, (ArrayInitializerNode) en,
766 // case Kind.ClassTypeNode:
767 // checkClassTypeNode(md, nametable, (ClassTypeNode) en, td);
770 // case Kind.OffsetNode:
771 // checkOffsetNode(md, nametable, (OffsetNode)en, td);
778 // addTypeLocation(en.getType(), compLoc);
783 private CompositeLocation checkLocationFromCastNode(MethodDescriptor md, SymbolTable nametable,
784 CastNode cn, CompositeLocation constraint) {
786 ExpressionNode en = cn.getExpression();
787 return checkLocationFromExpressionNode(md, nametable, en, new CompositeLocation(), constraint,
792 private CompositeLocation checkLocationFromTertiaryNode(MethodDescriptor md,
793 SymbolTable nametable, TertiaryNode tn, CompositeLocation constraint) {
794 ClassDescriptor cd = md.getClassDesc();
796 CompositeLocation condLoc =
797 checkLocationFromExpressionNode(md, nametable, tn.getCond(), new CompositeLocation(),
799 // addLocationType(tn.getCond().getType(), condLoc);
800 CompositeLocation trueLoc =
801 checkLocationFromExpressionNode(md, nametable, tn.getTrueExpr(), new CompositeLocation(),
803 // addLocationType(tn.getTrueExpr().getType(), trueLoc);
804 CompositeLocation falseLoc =
805 checkLocationFromExpressionNode(md, nametable, tn.getFalseExpr(), new CompositeLocation(),
807 // addLocationType(tn.getFalseExpr().getType(), falseLoc);
809 // locations from true/false branches can be TOP when there are only literal
811 // in this case, we don't need to check flow down rule!
813 // check if condLoc is higher than trueLoc & falseLoc
814 if (!trueLoc.get(0).isTop()
815 && !CompositeLattice.isGreaterThan(condLoc, trueLoc, generateErrorMessage(cd, tn))) {
817 "The location of the condition expression is lower than the true expression at "
818 + cd.getSourceFileName() + ":" + tn.getCond().getNumLine());
821 if (!falseLoc.get(0).isTop()
822 && !CompositeLattice.isGreaterThan(condLoc, falseLoc,
823 generateErrorMessage(cd, tn.getCond()))) {
825 "The location of the condition expression is lower than the false expression at "
826 + cd.getSourceFileName() + ":" + tn.getCond().getNumLine());
829 // then, return glb of trueLoc & falseLoc
830 Set<CompositeLocation> glbInputSet = new HashSet<CompositeLocation>();
831 glbInputSet.add(trueLoc);
832 glbInputSet.add(falseLoc);
834 if (glbInputSet.size() == 1) {
837 return CompositeLattice.calculateGLB(glbInputSet, generateErrorMessage(cd, tn));
842 private CompositeLocation checkLocationFromMethodInvokeNode(MethodDescriptor md,
843 SymbolTable nametable, MethodInvokeNode min, CompositeLocation loc,
844 CompositeLocation constraint) {
846 ClassDescriptor cd = md.getClassDesc();
847 MethodDescriptor calleeMD = min.getMethod();
849 NameDescriptor baseName = min.getBaseName();
850 boolean isSystemout = false;
851 if (baseName != null) {
852 isSystemout = baseName.getSymbol().equals("System.out");
855 if (!ssjava.isSSJavaUtil(calleeMD.getClassDesc()) && !ssjava.isTrustMethod(calleeMD)
856 && !calleeMD.getModifiers().isNative() && !isSystemout) {
858 CompositeLocation baseLocation = null;
859 if (min.getExpression() != null) {
861 checkLocationFromExpressionNode(md, nametable, min.getExpression(),
862 new CompositeLocation(), constraint, false);
864 if (min.getMethod().isStatic()) {
865 String globalLocId = ssjava.getMethodLattice(md).getGlobalLoc();
866 if (globalLocId == null) {
867 throw new Error("Method lattice does not define global variable location at "
868 + generateErrorMessage(md.getClassDesc(), min));
870 baseLocation = new CompositeLocation(new Location(md, globalLocId));
872 String thisLocId = ssjava.getMethodLattice(md).getThisLoc();
873 baseLocation = new CompositeLocation(new Location(md, thisLocId));
878 System.out.println("\n#checkLocationFromMethodInvokeNode=" + min.printNode(0)
879 + " baseLocation=" + baseLocation + " constraint=" + constraint);
881 if (constraint != null) {
883 CompositeLattice.compare(constraint, baseLocation, true, generateErrorMessage(cd, min));
885 if (compareResult == ComparisonResult.LESS) {
886 throw new Error("Method invocation does not respect the current branch constraint at "
887 + generateErrorMessage(cd, min));
888 } else if (compareResult != ComparisonResult.GREATER) {
889 // if the current constraint is higher than method's THIS location
890 // no need to check constraints!
891 CompositeLocation calleeConstraint =
892 translateCallerLocToCalleeLoc(calleeMD, baseLocation, constraint);
893 System.out.println("check method body for constraint:" + calleeMD + " calleeConstraint="
895 checkMethodBody(calleeMD.getClassDesc(), calleeMD, calleeConstraint);
899 checkCalleeConstraints(md, nametable, min, baseLocation, constraint);
901 // checkCallerArgumentLocationConstraints(md, nametable, min,
902 // baseLocation, constraint);
904 if (!min.getMethod().getReturnType().isVoid()) {
905 // If method has a return value, compute the highest possible return
906 // location in the caller's perspective
907 CompositeLocation ceilingLoc =
908 computeCeilingLocationForCaller(md, nametable, min, baseLocation, constraint);
913 return new CompositeLocation(Location.createTopLocation(md));
917 private CompositeLocation translateCallerLocToCalleeLoc(MethodDescriptor calleeMD,
918 CompositeLocation calleeBaseLoc, CompositeLocation constraint) {
920 CompositeLocation calleeConstraint = new CompositeLocation();
922 // if (constraint.startsWith(calleeBaseLoc)) {
923 // if the first part of constraint loc is matched with callee base loc
924 Location thisLoc = new Location(calleeMD, ssjava.getMethodLattice(calleeMD).getThisLoc());
925 calleeConstraint.addLocation(thisLoc);
926 for (int i = calleeBaseLoc.getSize(); i < constraint.getSize(); i++) {
927 calleeConstraint.addLocation(constraint.get(i));
932 return calleeConstraint;
935 private void checkCallerArgumentLocationConstraints(MethodDescriptor md, SymbolTable nametable,
936 MethodInvokeNode min, CompositeLocation callerBaseLoc, CompositeLocation constraint) {
937 // if parameter location consists of THIS and FIELD location,
938 // caller should pass an argument that is comparable to the declared
939 // parameter location
940 // and is not lower than the declared parameter location in the field
943 MethodDescriptor calleemd = min.getMethod();
945 List<CompositeLocation> callerArgList = new ArrayList<CompositeLocation>();
946 List<CompositeLocation> calleeParamList = new ArrayList<CompositeLocation>();
948 MethodLattice<String> calleeLattice = ssjava.getMethodLattice(calleemd);
949 Location calleeThisLoc = new Location(calleemd, calleeLattice.getThisLoc());
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(), constraint,
956 callerArgList.add(callerArgLoc);
959 // setup callee params set
960 for (int i = 0; i < calleemd.numParameters(); i++) {
961 VarDescriptor calleevd = (VarDescriptor) calleemd.getParameter(i);
962 CompositeLocation calleeLoc = d2loc.get(calleevd);
963 calleeParamList.add(calleeLoc);
966 String errorMsg = generateErrorMessage(md.getClassDesc(), min);
968 System.out.println("checkCallerArgumentLocationConstraints=" + min.printNode(0));
969 System.out.println("base location=" + callerBaseLoc + " constraint=" + constraint);
971 for (int i = 0; i < calleeParamList.size(); i++) {
972 CompositeLocation calleeParamLoc = calleeParamList.get(i);
973 if (calleeParamLoc.get(0).equals(calleeThisLoc) && calleeParamLoc.getSize() > 1) {
975 // callee parameter location has field information
976 CompositeLocation callerArgLoc = callerArgList.get(i);
978 CompositeLocation paramLocation =
979 translateCalleeParamLocToCaller(md, calleeParamLoc, callerBaseLoc, errorMsg);
981 Set<CompositeLocation> inputGLBSet = new HashSet<CompositeLocation>();
982 if (constraint != null) {
983 inputGLBSet.add(callerArgLoc);
984 inputGLBSet.add(constraint);
986 CompositeLattice.calculateGLB(inputGLBSet,
987 generateErrorMessage(md.getClassDesc(), min));
990 if (!CompositeLattice.isGreaterThan(callerArgLoc, paramLocation, errorMsg)) {
991 throw new Error("Caller argument '" + min.getArg(i).printNode(0) + " : " + callerArgLoc
992 + "' should be higher than corresponding callee's parameter : " + paramLocation
993 + " at " + errorMsg);
1001 private CompositeLocation translateCalleeParamLocToCaller(MethodDescriptor md,
1002 CompositeLocation calleeParamLoc, CompositeLocation callerBaseLocation, String errorMsg) {
1004 CompositeLocation translate = new CompositeLocation();
1006 for (int i = 0; i < callerBaseLocation.getSize(); i++) {
1007 translate.addLocation(callerBaseLocation.get(i));
1010 for (int i = 1; i < calleeParamLoc.getSize(); i++) {
1011 translate.addLocation(calleeParamLoc.get(i));
1014 System.out.println("TRANSLATED=" + translate + " from calleeParamLoc=" + calleeParamLoc);
1019 private CompositeLocation computeCeilingLocationForCaller(MethodDescriptor md,
1020 SymbolTable nametable, MethodInvokeNode min, CompositeLocation baseLocation,
1021 CompositeLocation constraint) {
1022 List<CompositeLocation> argList = new ArrayList<CompositeLocation>();
1024 // by default, method has a THIS parameter
1025 argList.add(baseLocation);
1027 for (int i = 0; i < min.numArgs(); i++) {
1028 ExpressionNode en = min.getArg(i);
1029 CompositeLocation callerArg =
1030 checkLocationFromExpressionNode(md, nametable, en, new CompositeLocation(), constraint,
1032 argList.add(callerArg);
1035 System.out.println("\n## computeReturnLocation=" + min.getMethod() + " argList=" + argList);
1036 CompositeLocation ceilLoc = md2ReturnLocGen.get(min.getMethod()).computeReturnLocation(argList);
1037 System.out.println("## ReturnLocation=" + ceilLoc);
1043 private void checkCalleeConstraints(MethodDescriptor md, SymbolTable nametable,
1044 MethodInvokeNode min, CompositeLocation callerBaseLoc, CompositeLocation constraint) {
1046 System.out.println("checkCalleeConstraints=" + min.printNode(0));
1048 MethodDescriptor calleemd = min.getMethod();
1050 MethodLattice<String> calleeLattice = ssjava.getMethodLattice(calleemd);
1051 CompositeLocation calleeThisLoc =
1052 new CompositeLocation(new Location(calleemd, calleeLattice.getThisLoc()));
1054 List<CompositeLocation> callerArgList = new ArrayList<CompositeLocation>();
1055 List<CompositeLocation> calleeParamList = new ArrayList<CompositeLocation>();
1057 if (min.numArgs() > 0) {
1058 // caller needs to guarantee that it passes arguments in regarding to
1059 // callee's hierarchy
1061 // setup caller args set
1062 // first, add caller's base(this) location
1063 callerArgList.add(callerBaseLoc);
1064 // second, add caller's arguments
1065 for (int i = 0; i < min.numArgs(); i++) {
1066 ExpressionNode en = min.getArg(i);
1067 CompositeLocation callerArgLoc =
1068 checkLocationFromExpressionNode(md, nametable, en, new CompositeLocation(), constraint,
1070 callerArgList.add(callerArgLoc);
1073 // setup callee params set
1074 // first, add callee's this location
1075 calleeParamList.add(calleeThisLoc);
1076 // second, add callee's parameters
1077 for (int i = 0; i < calleemd.numParameters(); i++) {
1078 VarDescriptor calleevd = (VarDescriptor) calleemd.getParameter(i);
1079 CompositeLocation calleeLoc = d2loc.get(calleevd);
1080 System.out.println("calleevd=" + calleevd + " loc=" + calleeLoc);
1081 calleeParamList.add(calleeLoc);
1084 // here, check if ordering relations among caller's args respect
1085 // ordering relations in-between callee's args
1086 CHECK: for (int i = 0; i < calleeParamList.size(); i++) {
1087 CompositeLocation calleeLoc1 = calleeParamList.get(i);
1088 CompositeLocation callerLoc1 = callerArgList.get(i);
1090 for (int j = 0; j < calleeParamList.size(); j++) {
1092 CompositeLocation calleeLoc2 = calleeParamList.get(j);
1093 CompositeLocation callerLoc2 = callerArgList.get(j);
1095 if (callerLoc1.get(callerLoc1.getSize() - 1).isTop()
1096 || callerLoc2.get(callerLoc2.getSize() - 1).isTop()) {
1100 System.out.println("calleeLoc1=" + calleeLoc1);
1101 System.out.println("calleeLoc2=" + calleeLoc2 + "calleeParamList=" + calleeParamList);
1104 CompositeLattice.compare(callerLoc1, callerLoc2, true,
1105 generateErrorMessage(md.getClassDesc(), min));
1107 CompositeLattice.compare(calleeLoc1, calleeLoc2, true,
1108 generateErrorMessage(md.getClassDesc(), min));
1110 if (calleeResult == ComparisonResult.GREATER
1111 && callerResult != ComparisonResult.GREATER) {
1112 // If calleeLoc1 is higher than calleeLoc2
1113 // then, caller should have same ordering relation in-bet
1114 // callerLoc1 & callerLoc2
1116 String paramName1, paramName2;
1119 paramName1 = "'THIS'";
1121 paramName1 = "'parameter " + calleemd.getParamName(i - 1) + "'";
1125 paramName2 = "'THIS'";
1127 paramName2 = "'parameter " + calleemd.getParamName(j - 1) + "'";
1131 "Caller doesn't respect an ordering relation among method arguments: callee expects that "
1132 + paramName1 + " should be higher than " + paramName2 + " in " + calleemd
1133 + " at " + md.getClassDesc().getSourceFileName() + ":" + min.getNumLine());
1144 private CompositeLocation checkLocationFromArrayAccessNode(MethodDescriptor md,
1145 SymbolTable nametable, ArrayAccessNode aan, CompositeLocation constraint, boolean isLHS) {
1147 ClassDescriptor cd = md.getClassDesc();
1149 CompositeLocation arrayLoc =
1150 checkLocationFromExpressionNode(md, nametable, aan.getExpression(),
1151 new CompositeLocation(), constraint, isLHS);
1152 // addTypeLocation(aan.getExpression().getType(), arrayLoc);
1153 CompositeLocation indexLoc =
1154 checkLocationFromExpressionNode(md, nametable, aan.getIndex(), new CompositeLocation(),
1156 // addTypeLocation(aan.getIndex().getType(), indexLoc);
1159 if (!CompositeLattice.isGreaterThan(indexLoc, arrayLoc, generateErrorMessage(cd, aan))) {
1160 throw new Error("Array index value is not higher than array location at "
1161 + generateErrorMessage(cd, aan));
1165 Set<CompositeLocation> inputGLB = new HashSet<CompositeLocation>();
1166 inputGLB.add(arrayLoc);
1167 inputGLB.add(indexLoc);
1168 return CompositeLattice.calculateGLB(inputGLB, generateErrorMessage(cd, aan));
1173 private CompositeLocation checkLocationFromCreateObjectNode(MethodDescriptor md,
1174 SymbolTable nametable, CreateObjectNode con) {
1176 ClassDescriptor cd = md.getClassDesc();
1178 CompositeLocation compLoc = new CompositeLocation();
1179 compLoc.addLocation(Location.createTopLocation(md));
1184 private CompositeLocation checkLocationFromOpNode(MethodDescriptor md, SymbolTable nametable,
1185 OpNode on, CompositeLocation constraint) {
1187 ClassDescriptor cd = md.getClassDesc();
1188 CompositeLocation leftLoc = new CompositeLocation();
1190 checkLocationFromExpressionNode(md, nametable, on.getLeft(), leftLoc, constraint, false);
1191 // addTypeLocation(on.getLeft().getType(), leftLoc);
1193 CompositeLocation rightLoc = new CompositeLocation();
1194 if (on.getRight() != null) {
1196 checkLocationFromExpressionNode(md, nametable, on.getRight(), rightLoc, constraint, false);
1197 // addTypeLocation(on.getRight().getType(), rightLoc);
1200 System.out.println("\n# OP NODE=" + on.printNode(0));
1201 System.out.println("# left loc=" + leftLoc + " from " + on.getLeft().getClass());
1202 if (on.getRight() != null) {
1203 System.out.println("# right loc=" + rightLoc + " from " + on.getRight().getClass());
1206 Operation op = on.getOp();
1208 switch (op.getOp()) {
1210 case Operation.UNARYPLUS:
1211 case Operation.UNARYMINUS:
1212 case Operation.LOGIC_NOT:
1216 case Operation.LOGIC_OR:
1217 case Operation.LOGIC_AND:
1218 case Operation.COMP:
1219 case Operation.BIT_OR:
1220 case Operation.BIT_XOR:
1221 case Operation.BIT_AND:
1222 case Operation.ISAVAILABLE:
1223 case Operation.EQUAL:
1224 case Operation.NOTEQUAL:
1231 case Operation.MULT:
1234 case Operation.LEFTSHIFT:
1235 case Operation.RIGHTSHIFT:
1236 case Operation.URIGHTSHIFT:
1238 Set<CompositeLocation> inputSet = new HashSet<CompositeLocation>();
1239 inputSet.add(leftLoc);
1240 inputSet.add(rightLoc);
1241 CompositeLocation glbCompLoc =
1242 CompositeLattice.calculateGLB(inputSet, generateErrorMessage(cd, on));
1243 System.out.println("# glbCompLoc=" + glbCompLoc);
1247 throw new Error(op.toString());
1252 private CompositeLocation checkLocationFromLiteralNode(MethodDescriptor md,
1253 SymbolTable nametable, LiteralNode en, CompositeLocation loc) {
1255 // literal value has the top location so that value can be flowed into any
1257 Location literalLoc = Location.createTopLocation(md);
1258 loc.addLocation(literalLoc);
1263 private CompositeLocation checkLocationFromNameNode(MethodDescriptor md, SymbolTable nametable,
1264 NameNode nn, CompositeLocation loc, CompositeLocation constraint) {
1266 NameDescriptor nd = nn.getName();
1267 if (nd.getBase() != null) {
1269 checkLocationFromExpressionNode(md, nametable, nn.getExpression(), loc, constraint, false);
1271 String varname = nd.toString();
1272 if (varname.equals("this")) {
1274 MethodLattice<String> methodLattice = ssjava.getMethodLattice(md);
1275 String thisLocId = methodLattice.getThisLoc();
1276 if (thisLocId == null) {
1277 throw new Error("The location for 'this' is not defined at "
1278 + md.getClassDesc().getSourceFileName() + "::" + nn.getNumLine());
1280 Location locElement = new Location(md, thisLocId);
1281 loc.addLocation(locElement);
1286 Descriptor d = (Descriptor) nametable.get(varname);
1288 // CompositeLocation localLoc = null;
1289 if (d instanceof VarDescriptor) {
1290 VarDescriptor vd = (VarDescriptor) d;
1291 // localLoc = d2loc.get(vd);
1292 // the type of var descriptor has a composite location!
1293 loc = ((CompositeLocation) vd.getType().getExtension()).clone();
1294 } else if (d instanceof FieldDescriptor) {
1295 // the type of field descriptor has a location!
1296 FieldDescriptor fd = (FieldDescriptor) d;
1297 if (fd.isStatic()) {
1299 // if it is 'static final', the location has TOP since no one can
1301 loc.addLocation(Location.createTopLocation(md));
1304 // if 'static', the location has pre-assigned global loc
1305 MethodLattice<String> localLattice = ssjava.getMethodLattice(md);
1306 String globalLocId = localLattice.getGlobalLoc();
1307 if (globalLocId == null) {
1308 throw new Error("Global location element is not defined in the method " + md);
1310 Location globalLoc = new Location(md, globalLocId);
1312 loc.addLocation(globalLoc);
1315 // the location of field access starts from this, followed by field
1317 MethodLattice<String> localLattice = ssjava.getMethodLattice(md);
1318 Location thisLoc = new Location(md, localLattice.getThisLoc());
1319 loc.addLocation(thisLoc);
1322 Location fieldLoc = (Location) fd.getType().getExtension();
1323 loc.addLocation(fieldLoc);
1324 } else if (d == null) {
1325 // access static field
1326 ClassDescriptor cd = nn.getClassDesc();
1328 MethodLattice<String> localLattice = ssjava.getMethodLattice(md);
1329 String globalLocId = localLattice.getGlobalLoc();
1330 if (globalLocId == null) {
1331 throw new Error("Method lattice does not define global variable location at "
1332 + generateErrorMessage(md.getClassDesc(), nn));
1334 loc.addLocation(new Location(md, globalLocId));
1342 private CompositeLocation checkLocationFromFieldAccessNode(MethodDescriptor md,
1343 SymbolTable nametable, FieldAccessNode fan, CompositeLocation loc,
1344 CompositeLocation constraint) {
1346 ExpressionNode left = fan.getExpression();
1347 TypeDescriptor ltd = left.getType();
1349 FieldDescriptor fd = fan.getField();
1351 String varName = null;
1352 if (left.kind() == Kind.NameNode) {
1353 NameDescriptor nd = ((NameNode) left).getName();
1354 varName = nd.toString();
1357 if (ltd.isClassNameRef() || (varName != null && varName.equals("this"))) {
1358 // using a class name directly or access using this
1359 if (fd.isStatic() && fd.isFinal()) {
1360 loc.addLocation(Location.createTopLocation(md));
1365 if (left instanceof ArrayAccessNode) {
1366 System.out.println("HEREE!!");
1367 ArrayAccessNode aan = (ArrayAccessNode) left;
1368 left = aan.getExpression();
1371 loc = checkLocationFromExpressionNode(md, nametable, left, loc, constraint, false);
1372 System.out.println("### checkLocationFromFieldAccessNode=" + fan.printNode(0));
1373 System.out.println("### left=" + left.printNode(0));
1374 if (!left.getType().isPrimitive()) {
1375 Location fieldLoc = getFieldLocation(fd);
1376 loc.addLocation(fieldLoc);
1378 System.out.println("### field loc=" + loc);
1382 private Location getFieldLocation(FieldDescriptor fd) {
1384 System.out.println("### getFieldLocation=" + fd);
1385 System.out.println("### fd.getType().getExtension()=" + fd.getType().getExtension());
1387 Location fieldLoc = (Location) fd.getType().getExtension();
1389 // handle the case that method annotation checking skips checking field
1391 if (fieldLoc == null) {
1392 fieldLoc = checkFieldDeclaration(fd.getClassDescriptor(), fd);
1399 private CompositeLocation checkLocationFromAssignmentNode(MethodDescriptor md,
1400 SymbolTable nametable, AssignmentNode an, CompositeLocation loc, CompositeLocation constraint) {
1402 System.out.println("\n# ASSIGNMENTNODE=" + an.printNode(0));
1404 ClassDescriptor cd = md.getClassDesc();
1406 Set<CompositeLocation> inputGLBSet = new HashSet<CompositeLocation>();
1408 boolean postinc = true;
1409 if (an.getOperation().getBaseOp() == null
1410 || (an.getOperation().getBaseOp().getOp() != Operation.POSTINC && an.getOperation()
1411 .getBaseOp().getOp() != Operation.POSTDEC))
1414 // if LHS is array access node, need to check if array index is higher
1415 // than array itself
1416 CompositeLocation destLocation =
1417 checkLocationFromExpressionNode(md, nametable, an.getDest(), new CompositeLocation(),
1420 CompositeLocation rhsLocation;
1421 CompositeLocation srcLocation;
1425 checkLocationFromExpressionNode(md, nametable, an.getSrc(), new CompositeLocation(),
1428 srcLocation = rhsLocation;
1430 // if (!rhsLocation.get(rhsLocation.getSize() - 1).isTop()) {
1431 if (constraint != null) {
1432 inputGLBSet.add(rhsLocation);
1433 inputGLBSet.add(constraint);
1434 srcLocation = CompositeLattice.calculateGLB(inputGLBSet, generateErrorMessage(cd, an));
1438 System.out.println("dstLocation=" + destLocation);
1439 System.out.println("rhsLocation=" + rhsLocation);
1440 System.out.println("srcLocation=" + srcLocation);
1441 System.out.println("constraint=" + constraint);
1443 if (!CompositeLattice.isGreaterThan(srcLocation, destLocation, generateErrorMessage(cd, an))) {
1445 String context = "";
1446 if (constraint != null) {
1447 context = " and the current context constraint is " + constraint;
1450 throw new Error("The value flow from " + srcLocation + " to " + destLocation
1451 + " does not respect location hierarchy on the assignment " + an.printNode(0) + context
1452 + " at " + cd.getSourceFileName() + "::" + an.getNumLine());
1458 checkLocationFromExpressionNode(md, nametable, an.getDest(), new CompositeLocation(),
1461 if (constraint != null) {
1462 inputGLBSet.add(rhsLocation);
1463 inputGLBSet.add(constraint);
1464 srcLocation = CompositeLattice.calculateGLB(inputGLBSet, generateErrorMessage(cd, an));
1466 srcLocation = rhsLocation;
1469 System.out.println("srcLocation=" + srcLocation);
1470 System.out.println("rhsLocation=" + rhsLocation);
1471 System.out.println("constraint=" + constraint);
1473 if (!CompositeLattice.isGreaterThan(srcLocation, destLocation, generateErrorMessage(cd, an))) {
1475 if (srcLocation.equals(destLocation)) {
1476 throw new Error("Location " + srcLocation
1477 + " is not allowed to have the value flow that moves within the same location at '"
1478 + an.printNode(0) + "' of " + cd.getSourceFileName() + "::" + an.getNumLine());
1480 throw new Error("The value flow from " + srcLocation + " to " + destLocation
1481 + " does not respect location hierarchy on the assignment " + an.printNode(0)
1482 + " at " + cd.getSourceFileName() + "::" + an.getNumLine());
1489 return destLocation;
1492 private void assignLocationOfVarDescriptor(VarDescriptor vd, MethodDescriptor md,
1493 SymbolTable nametable, TreeNode n) {
1495 ClassDescriptor cd = md.getClassDesc();
1496 Vector<AnnotationDescriptor> annotationVec = vd.getType().getAnnotationMarkers();
1498 // currently enforce every variable to have corresponding location
1499 if (annotationVec.size() == 0) {
1500 throw new Error("Location is not assigned to variable '" + vd.getSymbol()
1501 + "' in the method '" + md + "' of the class " + cd.getSymbol() + " at "
1502 + generateErrorMessage(cd, n));
1505 if (annotationVec.size() > 1) { // variable can have at most one location
1506 throw new Error(vd.getSymbol() + " has more than one location.");
1509 AnnotationDescriptor ad = annotationVec.elementAt(0);
1511 if (ad.getType() == AnnotationDescriptor.SINGLE_ANNOTATION) {
1513 if (ad.getMarker().equals(SSJavaAnalysis.LOC)) {
1514 String locDec = ad.getValue(); // check if location is defined
1516 if (locDec.startsWith(SSJavaAnalysis.DELTA)) {
1517 DeltaLocation deltaLoc = parseDeltaDeclaration(md, n, locDec);
1518 d2loc.put(vd, deltaLoc);
1519 addLocationType(vd.getType(), deltaLoc);
1521 CompositeLocation compLoc = parseLocationDeclaration(md, n, locDec);
1523 Location lastElement = compLoc.get(compLoc.getSize() - 1);
1524 if (ssjava.isSharedLocation(lastElement)) {
1525 ssjava.mapSharedLocation2Descriptor(lastElement, vd);
1528 d2loc.put(vd, compLoc);
1529 addLocationType(vd.getType(), compLoc);
1537 private DeltaLocation parseDeltaDeclaration(MethodDescriptor md, TreeNode n, String locDec) {
1540 int dIdx = locDec.indexOf(SSJavaAnalysis.DELTA);
1543 int beginIdx = dIdx + 6;
1544 locDec = locDec.substring(beginIdx, locDec.length() - 1);
1545 dIdx = locDec.indexOf(SSJavaAnalysis.DELTA);
1548 CompositeLocation compLoc = parseLocationDeclaration(md, n, locDec);
1549 DeltaLocation deltaLoc = new DeltaLocation(compLoc, deltaCount);
1554 private Location parseFieldLocDeclaraton(String decl, String msg) throws Exception {
1556 int idx = decl.indexOf(".");
1558 String className = decl.substring(0, idx);
1559 String fieldName = decl.substring(idx + 1);
1561 className.replaceAll(" ", "");
1562 fieldName.replaceAll(" ", "");
1564 Descriptor d = state.getClassSymbolTable().get(className);
1567 System.out.println("state.getClassSymbolTable()=" + state.getClassSymbolTable());
1568 throw new Error("The class in the location declaration '" + decl + "' does not exist at "
1572 assert (d instanceof ClassDescriptor);
1573 SSJavaLattice<String> lattice = ssjava.getClassLattice((ClassDescriptor) d);
1574 if (!lattice.containsKey(fieldName)) {
1575 throw new Error("The location " + fieldName + " is not defined in the field lattice of '"
1576 + className + "' at " + msg);
1579 return new Location(d, fieldName);
1582 private CompositeLocation parseLocationDeclaration(MethodDescriptor md, TreeNode n, String locDec) {
1584 CompositeLocation compLoc = new CompositeLocation();
1586 StringTokenizer tokenizer = new StringTokenizer(locDec, ",");
1587 List<String> locIdList = new ArrayList<String>();
1588 while (tokenizer.hasMoreTokens()) {
1589 String locId = tokenizer.nextToken();
1590 locIdList.add(locId);
1593 // at least,one location element needs to be here!
1594 assert (locIdList.size() > 0);
1596 // assume that loc with idx 0 comes from the local lattice
1597 // loc with idx 1 comes from the field lattice
1599 String localLocId = locIdList.get(0);
1600 SSJavaLattice<String> localLattice = CompositeLattice.getLatticeByDescriptor(md);
1601 Location localLoc = new Location(md, localLocId);
1602 if (localLattice == null || (!localLattice.containsKey(localLocId))) {
1603 System.out.println("locDec=" + locDec);
1604 throw new Error("Location " + localLocId
1605 + " is not defined in the local variable lattice at "
1606 + md.getClassDesc().getSourceFileName() + "::" + (n != null ? n.getNumLine() : md) + ".");
1608 compLoc.addLocation(localLoc);
1610 for (int i = 1; i < locIdList.size(); i++) {
1611 String locName = locIdList.get(i);
1614 parseFieldLocDeclaraton(locName, generateErrorMessage(md.getClassDesc(), n));
1615 compLoc.addLocation(fieldLoc);
1616 } catch (Exception e) {
1617 throw new Error("The location declaration '" + locName + "' is wrong at "
1618 + generateErrorMessage(md.getClassDesc(), n));
1626 private void checkDeclarationNode(MethodDescriptor md, SymbolTable nametable, DeclarationNode dn) {
1627 VarDescriptor vd = dn.getVarDescriptor();
1628 assignLocationOfVarDescriptor(vd, md, nametable, dn);
1631 private void checkDeclarationInClass(ClassDescriptor cd) {
1632 // Check to see that fields are okay
1633 for (Iterator field_it = cd.getFields(); field_it.hasNext();) {
1634 FieldDescriptor fd = (FieldDescriptor) field_it.next();
1636 if (!(fd.isFinal() && fd.isStatic())) {
1637 checkFieldDeclaration(cd, fd);
1639 // for static final, assign top location by default
1640 Location loc = Location.createTopLocation(cd);
1641 addLocationType(fd.getType(), loc);
1646 private Location checkFieldDeclaration(ClassDescriptor cd, FieldDescriptor fd) {
1648 Vector<AnnotationDescriptor> annotationVec = fd.getType().getAnnotationMarkers();
1650 // currently enforce every field to have corresponding location
1651 if (annotationVec.size() == 0) {
1652 throw new Error("Location is not assigned to the field '" + fd.getSymbol()
1653 + "' of the class " + cd.getSymbol() + " at " + cd.getSourceFileName());
1656 if (annotationVec.size() > 1) {
1657 // variable can have at most one location
1658 throw new Error("Field " + fd.getSymbol() + " of class " + cd
1659 + " has more than one location.");
1662 AnnotationDescriptor ad = annotationVec.elementAt(0);
1663 Location loc = null;
1665 if (ad.getType() == AnnotationDescriptor.SINGLE_ANNOTATION) {
1666 if (ad.getMarker().equals(SSJavaAnalysis.LOC)) {
1667 String locationID = ad.getValue();
1668 // check if location is defined
1669 SSJavaLattice<String> lattice = ssjava.getClassLattice(cd);
1670 if (lattice == null || (!lattice.containsKey(locationID))) {
1671 throw new Error("Location " + locationID
1672 + " is not defined in the field lattice of class " + cd.getSymbol() + " at"
1673 + cd.getSourceFileName() + ".");
1675 loc = new Location(cd, locationID);
1677 if (ssjava.isSharedLocation(loc)) {
1678 ssjava.mapSharedLocation2Descriptor(loc, fd);
1681 addLocationType(fd.getType(), loc);
1689 private void addLocationType(TypeDescriptor type, CompositeLocation loc) {
1691 type.setExtension(loc);
1695 private void addLocationType(TypeDescriptor type, Location loc) {
1697 type.setExtension(loc);
1701 static class CompositeLattice {
1703 public static boolean isGreaterThan(CompositeLocation loc1, CompositeLocation loc2, String msg) {
1705 System.out.println("\nisGreaterThan=" + loc1 + " " + loc2 + " msg=" + msg);
1706 int baseCompareResult = compareBaseLocationSet(loc1, loc2, true, false, msg);
1707 if (baseCompareResult == ComparisonResult.EQUAL) {
1708 if (compareDelta(loc1, loc2) == ComparisonResult.GREATER) {
1713 } else if (baseCompareResult == ComparisonResult.GREATER) {
1721 public static int compare(CompositeLocation loc1, CompositeLocation loc2, boolean ignore,
1724 System.out.println("compare=" + loc1 + " " + loc2);
1725 int baseCompareResult = compareBaseLocationSet(loc1, loc2, false, ignore, msg);
1727 if (baseCompareResult == ComparisonResult.EQUAL) {
1728 return compareDelta(loc1, loc2);
1730 return baseCompareResult;
1735 private static int compareDelta(CompositeLocation dLoc1, CompositeLocation dLoc2) {
1737 int deltaCount1 = 0;
1738 int deltaCount2 = 0;
1739 if (dLoc1 instanceof DeltaLocation) {
1740 deltaCount1 = ((DeltaLocation) dLoc1).getNumDelta();
1743 if (dLoc2 instanceof DeltaLocation) {
1744 deltaCount2 = ((DeltaLocation) dLoc2).getNumDelta();
1746 if (deltaCount1 < deltaCount2) {
1747 return ComparisonResult.GREATER;
1748 } else if (deltaCount1 == deltaCount2) {
1749 return ComparisonResult.EQUAL;
1751 return ComparisonResult.LESS;
1756 private static int compareBaseLocationSet(CompositeLocation compLoc1,
1757 CompositeLocation compLoc2, boolean awareSharedLoc, boolean ignore, String msg) {
1759 // if compLoc1 is greater than compLoc2, return true
1760 // else return false;
1762 // compare one by one in according to the order of the tuple
1764 for (int i = 0; i < compLoc1.getSize(); i++) {
1765 Location loc1 = compLoc1.get(i);
1766 if (i >= compLoc2.getSize()) {
1768 return ComparisonResult.INCOMPARABLE;
1770 throw new Error("Failed to compare two locations of " + compLoc1 + " and " + compLoc2
1771 + " because they are not comparable at " + msg);
1774 Location loc2 = compLoc2.get(i);
1776 Descriptor descriptor = getCommonParentDescriptor(loc1, loc2, msg);
1777 SSJavaLattice<String> lattice = getLatticeByDescriptor(descriptor);
1779 // check if the shared location is appeared only at the end of the
1780 // composite location
1781 if (lattice.getSharedLocSet().contains(loc1.getLocIdentifier())) {
1782 if (i != (compLoc1.getSize() - 1)) {
1783 throw new Error("The shared location " + loc1.getLocIdentifier()
1784 + " cannot be appeared in the middle of composite location at" + msg);
1788 if (lattice.getSharedLocSet().contains(loc2.getLocIdentifier())) {
1789 if (i != (compLoc2.getSize() - 1)) {
1790 throw new Error("The shared location " + loc2.getLocIdentifier()
1791 + " cannot be appeared in the middle of composite location at " + msg);
1795 // if (!lattice1.equals(lattice2)) {
1796 // throw new Error("Failed to compare two locations of " + compLoc1 +
1797 // " and " + compLoc2
1798 // + " because they are not comparable at " + msg);
1801 if (loc1.getLocIdentifier().equals(loc2.getLocIdentifier())) {
1803 // check if the current location is the spinning location
1804 // note that the spinning location only can be appeared in the last
1805 // part of the composite location
1806 if (awareSharedLoc && numOfTie == compLoc1.getSize()
1807 && lattice.getSharedLocSet().contains(loc1.getLocIdentifier())) {
1808 return ComparisonResult.GREATER;
1811 } else if (lattice.isGreaterThan(loc1.getLocIdentifier(), loc2.getLocIdentifier())) {
1812 return ComparisonResult.GREATER;
1814 return ComparisonResult.LESS;
1819 if (numOfTie == compLoc1.getSize()) {
1821 if (numOfTie != compLoc2.getSize()) {
1824 return ComparisonResult.INCOMPARABLE;
1826 throw new Error("Failed to compare two locations of " + compLoc1 + " and " + compLoc2
1827 + " because they are not comparable at " + msg);
1832 return ComparisonResult.EQUAL;
1835 return ComparisonResult.LESS;
1839 public static CompositeLocation calculateGLB(Set<CompositeLocation> inputSet, String errMsg) {
1841 System.out.println("Calculating GLB=" + inputSet);
1842 CompositeLocation glbCompLoc = new CompositeLocation();
1844 // calculate GLB of the first(priority) element
1845 Set<String> priorityLocIdentifierSet = new HashSet<String>();
1846 Descriptor priorityDescriptor = null;
1848 Hashtable<String, Set<CompositeLocation>> locId2CompLocSet =
1849 new Hashtable<String, Set<CompositeLocation>>();
1850 // mapping from the priority loc ID to its full representation by the
1851 // composite location
1853 int maxTupleSize = 0;
1854 CompositeLocation maxCompLoc = null;
1856 Location prevPriorityLoc = null;
1857 for (Iterator iterator = inputSet.iterator(); iterator.hasNext();) {
1858 CompositeLocation compLoc = (CompositeLocation) iterator.next();
1859 if (compLoc.getSize() > maxTupleSize) {
1860 maxTupleSize = compLoc.getSize();
1861 maxCompLoc = compLoc;
1863 Location priorityLoc = compLoc.get(0);
1864 String priorityLocId = priorityLoc.getLocIdentifier();
1865 priorityLocIdentifierSet.add(priorityLocId);
1867 if (locId2CompLocSet.containsKey(priorityLocId)) {
1868 locId2CompLocSet.get(priorityLocId).add(compLoc);
1870 Set<CompositeLocation> newSet = new HashSet<CompositeLocation>();
1871 newSet.add(compLoc);
1872 locId2CompLocSet.put(priorityLocId, newSet);
1875 // check if priority location are coming from the same lattice
1876 if (priorityDescriptor == null) {
1877 priorityDescriptor = priorityLoc.getDescriptor();
1879 priorityDescriptor = getCommonParentDescriptor(priorityLoc, prevPriorityLoc, errMsg);
1881 prevPriorityLoc = priorityLoc;
1882 // else if (!priorityDescriptor.equals(priorityLoc.getDescriptor())) {
1883 // throw new Error("Failed to calculate GLB of " + inputSet
1884 // + " because they are from different lattices.");
1888 SSJavaLattice<String> locOrder = getLatticeByDescriptor(priorityDescriptor);
1889 String glbOfPriorityLoc = locOrder.getGLB(priorityLocIdentifierSet);
1891 glbCompLoc.addLocation(new Location(priorityDescriptor, glbOfPriorityLoc));
1892 Set<CompositeLocation> compSet = locId2CompLocSet.get(glbOfPriorityLoc);
1894 if (compSet == null) {
1895 // when GLB(x1,x2)!=x1 and !=x2 : GLB case 4
1896 // mean that the result is already lower than <x1,y1> and <x2,y2>
1897 // assign TOP to the rest of the location elements
1899 // in this case, do not take care about delta
1900 // CompositeLocation inputComp = inputSet.iterator().next();
1901 for (int i = 1; i < maxTupleSize; i++) {
1902 glbCompLoc.addLocation(Location.createTopLocation(maxCompLoc.get(i).getDescriptor()));
1906 // here find out composite location that has a maximum length tuple
1907 // if we have three input set: [A], [A,B], [A,B,C]
1908 // maximum length tuple will be [A,B,C]
1910 CompositeLocation maxFromCompSet = null;
1911 for (Iterator iterator = compSet.iterator(); iterator.hasNext();) {
1912 CompositeLocation c = (CompositeLocation) iterator.next();
1913 if (c.getSize() > max) {
1919 if (compSet.size() == 1) {
1920 // if GLB(x1,x2)==x1 or x2 : GLB case 2,3
1921 CompositeLocation comp = compSet.iterator().next();
1922 for (int i = 1; i < comp.getSize(); i++) {
1923 glbCompLoc.addLocation(comp.get(i));
1926 // if input location corresponding to glb is a delta, need to apply
1927 // delta to glb result
1928 if (comp instanceof DeltaLocation) {
1929 glbCompLoc = new DeltaLocation(glbCompLoc, 1);
1933 // when GLB(x1,x2)==x1 and x2 : GLB case 1
1934 // if more than one location shares the same priority GLB
1935 // need to calculate the rest of GLB loc
1937 // setup input set starting from the second tuple item
1938 Set<CompositeLocation> innerGLBInput = new HashSet<CompositeLocation>();
1939 for (Iterator iterator = compSet.iterator(); iterator.hasNext();) {
1940 CompositeLocation compLoc = (CompositeLocation) iterator.next();
1941 CompositeLocation innerCompLoc = new CompositeLocation();
1942 for (int idx = 1; idx < compLoc.getSize(); idx++) {
1943 innerCompLoc.addLocation(compLoc.get(idx));
1945 if (innerCompLoc.getSize() > 0) {
1946 innerGLBInput.add(innerCompLoc);
1950 if (innerGLBInput.size() > 0) {
1951 CompositeLocation innerGLB = CompositeLattice.calculateGLB(innerGLBInput, errMsg);
1952 for (int idx = 0; idx < innerGLB.getSize(); idx++) {
1953 glbCompLoc.addLocation(innerGLB.get(idx));
1957 // if input location corresponding to glb is a delta, need to apply
1958 // delta to glb result
1960 for (Iterator iterator = compSet.iterator(); iterator.hasNext();) {
1961 CompositeLocation compLoc = (CompositeLocation) iterator.next();
1962 if (compLoc instanceof DeltaLocation) {
1963 if (glbCompLoc.equals(compLoc)) {
1964 glbCompLoc = new DeltaLocation(glbCompLoc, 1);
1973 System.out.println("GLB=" + glbCompLoc);
1978 static SSJavaLattice<String> getLatticeByDescriptor(Descriptor d) {
1980 SSJavaLattice<String> lattice = null;
1982 if (d instanceof ClassDescriptor) {
1983 lattice = ssjava.getCd2lattice().get(d);
1984 } else if (d instanceof MethodDescriptor) {
1985 if (ssjava.getMd2lattice().containsKey(d)) {
1986 lattice = ssjava.getMd2lattice().get(d);
1988 // use default lattice for the method
1989 lattice = ssjava.getCd2methodDefault().get(((MethodDescriptor) d).getClassDesc());
1996 static Descriptor getCommonParentDescriptor(Location loc1, Location loc2, String msg) {
1998 Descriptor d1 = loc1.getDescriptor();
1999 Descriptor d2 = loc2.getDescriptor();
2001 Descriptor descriptor;
2003 if (d1 instanceof ClassDescriptor && d2 instanceof ClassDescriptor) {
2005 if (d1.equals(d2)) {
2008 // identifying which one is parent class
2009 Set<Descriptor> d1SubClassesSet = ssjava.tu.getSubClasses((ClassDescriptor) d1);
2010 Set<Descriptor> d2SubClassesSet = ssjava.tu.getSubClasses((ClassDescriptor) d2);
2012 if (d1 == null && d2 == null) {
2013 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2014 + " because they are not comparable at " + msg);
2015 } else if (d1SubClassesSet != null && d1SubClassesSet.contains(d2)) {
2017 } else if (d2SubClassesSet != null && d2SubClassesSet.contains(d1)) {
2020 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2021 + " because they are not comparable at " + msg);
2025 } else if (d1 instanceof MethodDescriptor && d2 instanceof MethodDescriptor) {
2027 if (d1.equals(d2)) {
2031 // identifying which one is parent class
2032 MethodDescriptor md1 = (MethodDescriptor) d1;
2033 MethodDescriptor md2 = (MethodDescriptor) d2;
2035 if (!md1.matches(md2)) {
2036 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2037 + " because they are not comparable at " + msg);
2040 Set<Descriptor> d1SubClassesSet =
2041 ssjava.tu.getSubClasses(((MethodDescriptor) d1).getClassDesc());
2042 Set<Descriptor> d2SubClassesSet =
2043 ssjava.tu.getSubClasses(((MethodDescriptor) d2).getClassDesc());
2045 if (d1 == null && d2 == null) {
2046 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2047 + " because they are not comparable at " + msg);
2048 } else if (d1 != null && d1SubClassesSet.contains(d2)) {
2050 } else if (d2 != null && d2SubClassesSet.contains(d1)) {
2053 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2054 + " because they are not comparable at " + msg);
2059 throw new Error("Failed to compare two locations of " + loc1 + " and " + loc2
2060 + " because they are not comparable at " + msg);
2069 class ComparisonResult {
2071 public static final int GREATER = 0;
2072 public static final int EQUAL = 1;
2073 public static final int LESS = 2;
2074 public static final int INCOMPARABLE = 3;
2081 class ReturnLocGenerator {
2083 public static final int PARAMISHIGHER = 0;
2084 public static final int PARAMISSAME = 1;
2085 public static final int IGNORE = 2;
2087 private Hashtable<Integer, Integer> paramIdx2paramType;
2089 private CompositeLocation declaredReturnLoc = null;
2091 public ReturnLocGenerator(CompositeLocation returnLoc, MethodDescriptor md,
2092 List<CompositeLocation> params, String msg) {
2094 CompositeLocation thisLoc = params.get(0);
2095 if (returnLoc.get(0).equals(thisLoc.get(0)) && returnLoc.getSize() > 1) {
2096 // if the declared return location consists of THIS and field location,
2097 // return location for the caller's side has to have same field element
2098 this.declaredReturnLoc = returnLoc;
2100 // creating mappings
2101 paramIdx2paramType = new Hashtable<Integer, Integer>();
2102 for (int i = 0; i < params.size(); i++) {
2103 CompositeLocation param = params.get(i);
2104 int compareResult = CompositeLattice.compare(param, returnLoc, true, msg);
2107 if (compareResult == ComparisonResult.GREATER) {
2109 } else if (compareResult == ComparisonResult.EQUAL) {
2114 paramIdx2paramType.put(new Integer(i), new Integer(type));
2120 public CompositeLocation computeReturnLocation(List<CompositeLocation> args) {
2122 if (declaredReturnLoc != null) {
2123 // when developer specify that the return value is [THIS,field]
2124 // needs to translate to the caller's location
2125 CompositeLocation callerLoc = new CompositeLocation();
2126 CompositeLocation callerBaseLocation = args.get(0);
2128 for (int i = 0; i < callerBaseLocation.getSize(); i++) {
2129 callerLoc.addLocation(callerBaseLocation.get(i));
2131 for (int i = 1; i < declaredReturnLoc.getSize(); i++) {
2132 callerLoc.addLocation(declaredReturnLoc.get(i));
2136 // compute the highest possible location in caller's side
2137 assert paramIdx2paramType.keySet().size() == args.size();
2139 Set<CompositeLocation> inputGLB = new HashSet<CompositeLocation>();
2140 for (int i = 0; i < args.size(); i++) {
2141 int type = (paramIdx2paramType.get(new Integer(i))).intValue();
2142 CompositeLocation argLoc = args.get(i);
2143 if (type == PARAMISHIGHER || type == PARAMISSAME) {
2144 // return loc is equal to or lower than param
2145 inputGLB.add(argLoc);
2149 // compute GLB of arguments subset that are same or higher than return
2151 if (inputGLB.isEmpty()) {
2152 CompositeLocation rtr =
2153 new CompositeLocation(Location.createTopLocation(args.get(0).get(0).getDescriptor()));
2156 CompositeLocation glb = CompositeLattice.calculateGLB(inputGLB, "");