package Analysis.SSJava;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Iterator;
+import java.util.List;
import java.util.Set;
import java.util.Vector;
import Analysis.Liveness;
import IR.AnnotationDescriptor;
import IR.ClassDescriptor;
-import IR.Descriptor;
+import IR.FieldDescriptor;
import IR.MethodDescriptor;
import IR.Operation;
import IR.State;
State state;
SSJavaAnalysis ssjava;
String needToNullify = null;
- AssignmentNode prevAssignNode;
+ TreeNode prevAssignNode;
Set<TreeNode> linearTypeCheckSet;
Liveness liveness;
+ boolean deterministic = true;
+
public LinearTypeCheck(SSJavaAnalysis ssjava, State state) {
this.ssjava = ssjava;
this.state = state;
}
// second, check the linear type
- it = state.getClassSymbolTable().getDescriptorsIterator();
- while (it.hasNext()) {
- ClassDescriptor cd = (ClassDescriptor) it.next();
- for (Iterator method_it = cd.getMethods(); method_it.hasNext();) {
- MethodDescriptor md = (MethodDescriptor) method_it.next();
- checkMethodBody(cd, md);
+ if (deterministic) {
+
+ SymbolTable classtable = state.getClassSymbolTable();
+
+ List<ClassDescriptor> toanalyzeList = new ArrayList<ClassDescriptor>();
+ List<MethodDescriptor> toanalyzeMethodList = new ArrayList<MethodDescriptor>();
+
+ toanalyzeList.addAll(classtable.getValueSet());
+ Collections.sort(toanalyzeList, new Comparator<ClassDescriptor>() {
+ public int compare(ClassDescriptor o1, ClassDescriptor o2) {
+ return o1.getClassName().compareTo(o2.getClassName());
+ }
+ });
+
+ for (int i = 0; i < toanalyzeList.size(); i++) {
+ ClassDescriptor cd = toanalyzeList.get(i);
+
+ SymbolTable methodtable = cd.getMethodTable();
+ toanalyzeMethodList.clear();
+ toanalyzeMethodList.addAll(methodtable.getValueSet());
+ Collections.sort(toanalyzeMethodList, new Comparator<MethodDescriptor>() {
+ public int compare(MethodDescriptor o1, MethodDescriptor o2) {
+ return o1.getSymbol().compareTo(o2.getSymbol());
+ }
+ });
+
+ for (int mdIdx = 0; mdIdx < toanalyzeMethodList.size(); mdIdx++) {
+ MethodDescriptor md = toanalyzeMethodList.get(mdIdx);
+ if (ssjava.needToCheckLinearType(md)) {
+ checkMethodBody(cd, md);
+ }
+ }
+
+ }
+
+ } else {
+ it = state.getClassSymbolTable().getDescriptorsIterator();
+ while (it.hasNext()) {
+ ClassDescriptor cd = (ClassDescriptor) it.next();
+ for (Iterator method_it = cd.getMethods(); method_it.hasNext();) {
+ MethodDescriptor md = (MethodDescriptor) method_it.next();
+ checkMethodBody(cd, md);
+ }
}
}
}
private void checkMethodBody(ClassDescriptor cd, MethodDescriptor md) {
+ if (state.SSJAVADEBUG) {
+ System.out.println("SSJAVA: Linear Type Checking: " + md);
+ }
BlockNode bn = state.getMethodBody(md);
checkBlockNode(md, md.getParameterTable(), bn);
}
}
}
- private void checkTertiaryNode(MethodDescriptor md, SymbolTable nametable, TertiaryNode en) {
- // TODO Auto-generated method stub
-
+ private void checkTertiaryNode(MethodDescriptor md, SymbolTable nametable, TertiaryNode tn) {
+ checkExpressionNode(md, nametable, tn.getCond());
+ checkExpressionNode(md, nametable, tn.getTrueExpr());
+ checkExpressionNode(md, nametable, tn.getFalseExpr());
}
private void checkOffsetNode(MethodDescriptor md, SymbolTable nametable, OffsetNode en) {
TypeDescriptor paramType = calleeMethodDesc.getParamType(i);
- if (isReference(argNode.getType())) {
+ if (isReference(argNode.getType()) && !argNode.getType().isNull()) {
boolean isParamOwnedByCallee = false;
if (paramType.getExtension() != null) {
if (isParamOwnedByCallee) {
+ // cannot pass field reference through ownership transition
+ if (isField(argNode)) {
+ throw new Error("Caller cannot transfer its ownership of the field reference at "
+ + md.getClassDesc() + "::" + min.getNumLine());
+ }
+
// method expects that argument is owned by caller
SSJavaType locationType = (SSJavaType) argType.getExtension();
throw new Error("Caller passes an argument not owned by itself at " + md.getClassDesc()
+ "::" + min.getNumLine());
}
+
+ // delegated arg is no longer to be available from here
+ linearTypeCheckSet.add(argNode);
+ mapTreeNode2FlatMethod.put(argNode, state.getMethodFlat(md));
}
}
if (en.kind() == Kind.AssignmentNode) {
AssignmentNode an = (AssignmentNode) en;
- String destName = an.getDest().printNode(0);
- if (destName.startsWith("this.")) {
- destName = destName.substring(5);
- }
+ boolean postinc = isPostIncAssignment(an);
- if (an.getSrc().getType().isNull() && destName.equals(needToNullify)) {
- needToNullify = null;
- return true;
+ if (!postinc) {
+ String destName = an.getDest().printNode(0);
+ if (destName.startsWith("this.")) {
+ destName = destName.substring(5);
+ }
+ if (an.getSrc().getType().isNull() && destName.equals(needToNullify)) {
+ needToNullify = null;
+ return true;
+ }
}
+
}
}
}
}
- private void checkAssignmentNode(MethodDescriptor md, SymbolTable nametable, AssignmentNode an) {
-
- boolean postinc = true;
+ public boolean isPostIncAssignment(AssignmentNode an) {
if (an.getOperation().getBaseOp() == null
|| (an.getOperation().getBaseOp().getOp() != Operation.POSTINC && an.getOperation()
- .getBaseOp().getOp() != Operation.POSTDEC))
- postinc = false;
+ .getBaseOp().getOp() != Operation.POSTDEC)) {
+ return false;
+ } else {
+ return true;
+ }
+ }
- if (!postinc) {
+ private void checkAssignmentNode(MethodDescriptor md, SymbolTable nametable, AssignmentNode an) {
- checkExpressionNode(md, nametable, an.getSrc());
+ boolean postinc = isPostIncAssignment(an);
+ if (!postinc) {
+ checkExpressionNode(md, nametable, an.getSrc());
if (isReference(an.getSrc().getType()) && isReference(an.getDest().getType())) {
- if (an.getSrc().kind() == Kind.NameNode) {
-
- NameNode nn = (NameNode) an.getSrc();
-
- if (nn.getField() != null) {
- needToNullify = nn.getField().getSymbol();
- prevAssignNode = an;
- } else if (nn.getExpression() != null) {
- if (nn.getExpression() instanceof FieldAccessNode) {
- FieldAccessNode fan = (FieldAccessNode) nn.getExpression();
- needToNullify = fan.printNode(0);
- prevAssignNode = an;
-
- }
-
- } else {
- // local variable case
- linearTypeCheckSet.add(an.getSrc());
- mapTreeNode2FlatMethod.put(an.getSrc(), state.getMethodFlat(md));
- }
- } else if (an.getSrc().kind() == Kind.FieldAccessNode) {
- FieldAccessNode fan = (FieldAccessNode) an.getSrc();
- needToNullify = fan.printNode(0);
- if (needToNullify.startsWith("this.")) {
- needToNullify = needToNullify.substring(5);
- }
- prevAssignNode = an;
- } else if (an.getSrc().kind() == Kind.ArrayAccessNode) {
- throw new Error(
- "Not allowed to create an alias to the middle of the multidimensional array at "
- + md.getClassDesc() + "::" + an.getNumLine());
- }
-
- if (!an.getSrc().getType().isNull()) {
-
- TypeDescriptor srcType = getTypeDescriptor(an.getSrc());
- boolean isSourceOwned = false;
+ checkAlias(md, an, an.getSrc());
+ }
- if (srcType.getExtension() != null) {
- SSJavaType srcLocationType = (SSJavaType) srcType.getExtension();
- isSourceOwned = srcLocationType.isOwned();
- }
+ }
- if (!isField(an.getDest()) && isSourceOwned) {
- // here, transfer ownership from LHS to RHS when it creates alias
- TypeDescriptor destType = getTypeDescriptor(an.getDest());
- destType.setExtension(new SSJavaType(isSourceOwned));
- } else {
- // if instance is not owned by the method, not able to store
- // instance into field
- if (!isSourceOwned) {
- throw new Error(
- "Method is not allowed to store an instance not owned by itself into a field at "
- + md.getClassDesc() + "::" + an.getNumLine());
- }
- }
+ }
- }
+ private boolean isFieldOfClass(ClassDescriptor classDesc, String varName) {
+ return classDesc.getFieldTable().contains(varName);
+ }
- }
+ private boolean isCreatingAlias(ExpressionNode en) {
+ int kind = en.kind();
+ if (kind == Kind.NameNode || kind == Kind.ArrayAccessNode || kind == Kind.FieldAccessNode) {
+ return true;
}
+ return false;
}
private TypeDescriptor getTypeDescriptor(ExpressionNode en) {
-
if (en.kind() == Kind.NameNode) {
NameNode nn = (NameNode) en;
if (nn.getField() != null) {
} else if (en.kind() == Kind.CreateObjectNode) {
CreateObjectNode con = (CreateObjectNode) en;
return con.getType();
+ } else if (en.kind() == Kind.ArrayAccessNode) {
+ ArrayAccessNode aan = (ArrayAccessNode) en;
+ return aan.getExpression().getType();
+ }
+
+ return null;
+ }
+
+ private FieldDescriptor getFieldDescriptorFromExpressionNode(ExpressionNode en) {
+
+ if (en.kind() == Kind.NameNode) {
+ NameNode nn = (NameNode) en;
+ if (nn.getField() != null) {
+ return nn.getField();
+ }
+
+ if (nn.getName() != null && nn.getName().getBase() != null) {
+ return getFieldDescriptorFromExpressionNode(nn.getExpression());
+ }
+
+ } else if (en.kind() == Kind.FieldAccessNode) {
+ FieldAccessNode fan = (FieldAccessNode) en;
+ return fan.getField();
}
return null;
return false;
}
- private void checkDeclarationNode(MethodDescriptor md, SymbolTable nametable, DeclarationNode dn) {
- if (dn.getExpression() != null) {
- checkExpressionNode(md, nametable, dn.getExpression());
- if (dn.getExpression().kind() == Kind.CreateObjectNode) {
+ private void checkAlias(MethodDescriptor md, TreeNode node, ExpressionNode src) {
+
+ if (src.kind() == Kind.NameNode) {
+
+ NameNode nn = (NameNode) src;
+
+ if (nn.getField() != null) {
+ needToNullify = nn.getField().getSymbol();
+ prevAssignNode = node;
+ } else if (nn.getExpression() != null) {
+ if (nn.getExpression() instanceof FieldAccessNode) {
+ FieldAccessNode fan = (FieldAccessNode) nn.getExpression();
+ needToNullify = fan.printNode(0);
+ prevAssignNode = node;
+ }
+ } else {
+ // local variable case
+ linearTypeCheckSet.add(src);
+ mapTreeNode2FlatMethod.put(src, state.getMethodFlat(md));
+ }
+ } else if (src.kind() == Kind.FieldAccessNode) {
+ FieldAccessNode fan = (FieldAccessNode) src;
+ needToNullify = fan.printNode(0);
+ if (needToNullify.startsWith("this.")) {
+ needToNullify = needToNullify.substring(5);
+ }
+ prevAssignNode = node;
+ } else if (src.kind() == Kind.ArrayAccessNode) {
+ ArrayAccessNode aan = (ArrayAccessNode) src;
+ TypeDescriptor srcType = src.getType();
+ if (srcType.isPtr() && srcType.getArrayCount() > 0) {
+ throw new Error(
+ "Not allowed to create an alias to the middle of the multidimensional array at "
+ + md.getClassDesc().getSourceFileName() + "::" + node.getNumLine());
+ } else {
+ needToNullify = aan.printNode(0);
+ prevAssignNode = node;
+ }
+ } else if (src.kind() == Kind.CreateObjectNode || src.kind() == Kind.MethodInvokeNode
+ || src.kind() == Kind.ArrayInitializerNode || src.kind() == Kind.LiteralNode) {
+ if (node.kind() == Kind.DeclarationNode) {
+ DeclarationNode dn = (DeclarationNode) node;
dn.getVarDescriptor().getType().setExtension(new SSJavaType(true));
}
+ } else {
+ throw new Error("Not allowed this type of assignment at "
+ + md.getClassDesc().getSourceFileName() + "::" + node.getNumLine());
+ }
+
+ if (isCreatingAlias(src)) {
+
+ TypeDescriptor srcType = getTypeDescriptor(src);
+ boolean isSourceOwned = false;
+
+ if (srcType.getExtension() != null) {
+ SSJavaType srcLocationType = (SSJavaType) srcType.getExtension();
+ isSourceOwned = srcLocationType.isOwned();
+
+ if (isSourceOwned) {
+ if (isField(src)) {
+ ssjava.setFieldOnwership(md, getFieldDescriptorFromExpressionNode(src));
+ }
+ }
+
+ } else if (md.isConstructor() && isFieldOfClass(md.getClassDesc(), src.printNode(0))) {
+ isSourceOwned = true;
+ ssjava.setFieldOnwership(md, getFieldDescriptorFromExpressionNode(src));
+ }
+
+ if (node.kind() == Kind.AssignmentNode) {
+ AssignmentNode an = (AssignmentNode) node;
+ if (isField(an.getDest())) {
+ // if instance is not owned by the method, not able to store
+ // instance into field
+ if (!isSourceOwned) {
+ throw new Error(
+ "Method is not allowed to store an instance not owned by itself into a field at "
+ + md.getClassDesc().getSourceFileName() + "::" + node.getNumLine());
+ }
+ } else {
+ if (isSourceOwned) {
+ // here, transfer ownership from LHS to RHS when it creates alias
+ TypeDescriptor destType = getTypeDescriptor(an.getDest());
+ destType.setExtension(new SSJavaType(isSourceOwned));
+ }
+ }
+ }
}
}
+ private void checkDeclarationNode(MethodDescriptor md, SymbolTable nametable, DeclarationNode dn) {
+ if (dn.getExpression() != null) {
+ ExpressionNode src = dn.getExpression();
+ if (isReference(src.getType())) {
+ checkAlias(md, dn, src);
+ }
+ }
+ }
+
private boolean isReference(TypeDescriptor td) {
- if (td.isPtr()) {
+ if (td.isPtr() && (!td.isString())) {
return true;
}
return false;
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