import Analysis.Liveness;
import IR.AnnotationDescriptor;
import IR.ClassDescriptor;
+import IR.FieldDescriptor;
import IR.MethodDescriptor;
import IR.Operation;
import IR.State;
State state;
SSJavaAnalysis ssjava;
String needToNullify = null;
- ExpressionNode prevAssignNode;
+ TreeNode prevAssignNode;
Set<TreeNode> linearTypeCheckSet;
}
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);
}
+ "::" + min.getNumLine());
}
+ // delegated arg is no longer to be available from here
+ linearTypeCheckSet.add(argNode);
+ mapTreeNode2FlatMethod.put(argNode, state.getMethodFlat(md));
}
}
postinc = false;
if (!postinc) {
-
checkExpressionNode(md, nametable, an.getSrc());
-
if (isReference(an.getSrc().getType()) && isReference(an.getDest().getType())) {
+ checkAlias(md, an, an.getSrc());
+ }
- 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;
+ }
- }
+ private boolean isFieldOfClass(ClassDescriptor classDesc, String varName) {
+ return classDesc.getFieldTable().contains(varName);
+ }
- } 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) {
- TypeDescriptor srcType = an.getSrc().getType();
- if (srcType.isPtr() && !srcType.isString()) {
- throw new Error(
- "Not allowed to create an alias to the middle of the multidimensional array at "
- + md.getClassDesc().getSourceFileName() + "::" + an.getNumLine());
- }
- } else if (an.getSrc().kind() == Kind.CreateObjectNode
- || an.getSrc().kind() == Kind.MethodInvokeNode
- || an.getSrc().kind() == Kind.ArrayInitializerNode
- || an.getSrc().kind() == Kind.LiteralNode) {
+ private boolean isCreatingAlias(ExpressionNode en) {
- } else {
- throw new Error("Not allowed this type of assignment at "
- + md.getClassDesc().getSourceFileName() + "::" + an.getNumLine());
- }
+ int kind = en.kind();
+ if (kind == Kind.NameNode || kind == Kind.ArrayAccessNode || kind == Kind.FieldAccessNode) {
+ return true;
+ }
+ return false;
- if (isCreatingAlias(an.getSrc())) {
+ }
- TypeDescriptor srcType = getTypeDescriptor(an.getSrc());
- boolean isSourceOwned = false;
+ private TypeDescriptor getTypeDescriptor(ExpressionNode en) {
+ if (en.kind() == Kind.NameNode) {
+ NameNode nn = (NameNode) en;
+ if (nn.getField() != null) {
+ return nn.getVar().getType();
+ } else if (nn.getVar() != null) {
+ return nn.getVar().getType();
+ } else {
+ return getTypeDescriptor(nn.getExpression());
+ }
+ } else if (en.kind() == Kind.FieldAccessNode) {
+ FieldAccessNode fan = (FieldAccessNode) en;
+ return getTypeDescriptor(fan.getExpression());
+ } 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();
+ }
- if (srcType.getExtension() != null) {
- SSJavaType srcLocationType = (SSJavaType) srcType.getExtension();
- isSourceOwned = srcLocationType.isOwned();
- } else if (md.isConstructor()
- && isFieldOfClass(md.getClassDesc(), an.getSrc().printNode(0))) {
- isSourceOwned = true;
- }
+ return null;
+ }
- if (!isField(an.getDest())) {
- if (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().getSourceFileName() + "::" + an.getNumLine());
- }
- }
+ 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;
+ }
+
+ private boolean isField(ExpressionNode en) {
+
+ if (en.kind() == Kind.NameNode) {
+ NameNode nn = (NameNode) en;
+ if (nn.getField() != null) {
+ return true;
+ }
+
+ if (nn.getName() != null && nn.getName().getBase() != null) {
+ return true;
+ }
+
+ } else if (en.kind() == Kind.FieldAccessNode) {
+ return true;
+ }
+ return false;
}
- private void checkSource(MethodDescriptor md, ExpressionNode src, ExpressionNode dst) {
+ private void checkAlias(MethodDescriptor md, TreeNode node, ExpressionNode src) {
if (src.kind() == Kind.NameNode) {
if (nn.getField() != null) {
needToNullify = nn.getField().getSymbol();
- prevAssignNode = src;
+ prevAssignNode = node;
} else if (nn.getExpression() != null) {
if (nn.getExpression() instanceof FieldAccessNode) {
FieldAccessNode fan = (FieldAccessNode) nn.getExpression();
needToNullify = fan.printNode(0);
- prevAssignNode = src;
-
+ prevAssignNode = node;
}
-
} else {
// local variable case
linearTypeCheckSet.add(src);
if (needToNullify.startsWith("this.")) {
needToNullify = needToNullify.substring(5);
}
- prevAssignNode = src;
+ prevAssignNode = node;
} else if (src.kind() == Kind.ArrayAccessNode) {
TypeDescriptor srcType = src.getType();
if (srcType.isPtr() && !srcType.isString()) {
throw new Error(
"Not allowed to create an alias to the middle of the multidimensional array at "
- + md.getClassDesc().getSourceFileName() + "::" + src.getNumLine());
+ + md.getClassDesc().getSourceFileName() + "::" + node.getNumLine());
}
} 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() + "::" + src.getNumLine());
+ + md.getClassDesc().getSourceFileName() + "::" + node.getNumLine());
}
if (isCreatingAlias(src)) {
if (srcType.getExtension() != null) {
SSJavaType srcLocationType = (SSJavaType) srcType.getExtension();
isSourceOwned = srcLocationType.isOwned();
- } else if (md.isConstructor() && isFieldOfClass(md.getClassDesc(), src.printNode(0))) {
- isSourceOwned = true;
- }
- if (!isField(dst)) {
if (isSourceOwned) {
- // here, transfer ownership from LHS to RHS when it creates alias
- TypeDescriptor destType = getTypeDescriptor(dst);
- 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().getSourceFileName() + "::" + src.getNumLine());
+ if (isField(src)) {
+ ssjava.setFieldOnwership(md, getFieldDescriptorFromExpressionNode(src));
+ }
}
- }
-
- }
-
- }
-
- 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) {
- return nn.getVar().getType();
- } else if (nn.getVar() != null) {
- return nn.getVar().getType();
- } else {
- return getTypeDescriptor(nn.getExpression());
- }
- } else if (en.kind() == Kind.FieldAccessNode) {
- FieldAccessNode fan = (FieldAccessNode) en;
- return getTypeDescriptor(fan.getExpression());
- } 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 boolean isField(ExpressionNode en) {
-
- if (en.kind() == Kind.NameNode) {
- NameNode nn = (NameNode) en;
- if (nn.getField() != null) {
- return true;
+ } else if (md.isConstructor() && isFieldOfClass(md.getClassDesc(), src.printNode(0))) {
+ isSourceOwned = true;
+ ssjava.setFieldOnwership(md, getFieldDescriptorFromExpressionNode(src));
}
- if (nn.getName() != null && nn.getName().getBase() != null) {
- return true;
+ 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));
+ }
+ }
}
- } else if (en.kind() == Kind.FieldAccessNode) {
- return true;
}
- 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) {
- dn.getVarDescriptor().getType().setExtension(new SSJavaType(true));
- } else if (dn.getExpression().kind() == Kind.ArrayAccessNode
- && dn.getExpression().getType().isPtr()) {
- throw new Error(
- "Not allowed to create an alias to the middle of the multidimensional array at "
- + md.getClassDesc().getSourceFileName() + "::" + dn.getNumLine());
+ ExpressionNode src = dn.getExpression();
+ if (isReference(src.getType())) {
+ checkAlias(md, dn, src);
}
}
-
}
private boolean isReference(TypeDescriptor td) {
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