/** Perform the appropriate flow operations for declaration of a local variable */
protected Map flowLocalDecl(
DataFlowItem inItem, FlowGraph graph, LocalDecl ld, Set succEdgeKeys) {
Map m = new HashMap(inItem.initStatus);
MinMaxInitCount initCount = (MinMaxInitCount) m.get(ld.localInstance());
// if (initCount == null) {
if (ld.init() != null) {
// declaration of local var with initialization.
initCount = new MinMaxInitCount(InitCount.ONE, InitCount.ONE);
} else {
// declaration of local var with no initialization.
initCount = new MinMaxInitCount(InitCount.ZERO, InitCount.ZERO);
}
m.put(ld.localInstance(), initCount);
// }
// else {
// the initCount is not null. We now have a problem. Why is the
// initCount not null? Has this variable been assigned in its own
// initialization, or is this a declaration inside a loop body?
// XXX@@@ THIS IS A BUG THAT NEEDS TO BE FIXED.
// Currently, the declaration "final int i = (i=5);" will
// not be rejected, as we cannot distinguish between that and
// "while (true) {final int i = 4;}"
// }
// record the fact that we have seen a local declaration
currCBI.localDeclarations.add(ld.localInstance());
return itemToMap(new DataFlowItem(m), succEdgeKeys);
}
private Node buildLocalDecl(LocalDecl ld) throws SemanticException {
Type t = ld.declType();
SJLocalInstance li = (SJLocalInstance) ld.localInstance();
// SJNamedInstance ni = null;
if (t.isSubtype(SJ_PROTOCOL_TYPE)) // Mostly the same as for LocalDecl.
{
if (!(ld instanceof SJLocalProtocolDecl)) {
throw new SemanticException(
"[SJProtocolDeclTypeBuilder] Protocols may only be declared using the protocol keyword: "
+ ld);
}
SJTypeNode tn = disambiguateSJTypeNode(this, ((SJProtocolDecl) ld).sessionType());
SJSessionType st = tn.type();
String sjname = ld.name(); // Should match that given by SJVariable.sjname.
ld = ld.localInstance(sjts.SJLocalProtocolInstance(li, st, sjname));
ld = (LocalDecl) setSJProtocolDeclExt((SJProtocolDecl) ld, tn, sjname);
}
return ld;
}
/** Flatten complex expressions within the AST */
public Node leave(Node old, Node n, NodeVisitor v) {
if (n == noFlatten) {
noFlatten = null;
return n;
}
if (n instanceof Block) {
List l = (List) stack.removeFirst();
return ((Block) n).statements(l);
} else if (n instanceof Stmt && !(n instanceof LocalDecl)) {
List l = (List) stack.getFirst();
l.add(n);
return n;
} else if (n instanceof Expr
&& !(n instanceof Lit)
&& !(n instanceof Special)
&& !(n instanceof Local)) {
Expr e = (Expr) n;
if (e instanceof Assign) {
return n;
}
// create a local temp, initialized to the value of the complex
// expression
String name = newID();
LocalDecl def =
nf.LocalDecl(
e.position(), Flags.FINAL, nf.CanonicalTypeNode(e.position(), e.type()), name, e);
def = def.localInstance(ts.localInstance(e.position(), Flags.FINAL, e.type(), name));
List l = (List) stack.getFirst();
l.add(def);
// return the local temp instead of the complex expression
Local use = nf.Local(e.position(), name);
use = (Local) use.type(e.type());
use = use.localInstance(ts.localInstance(e.position(), Flags.FINAL, e.type(), name));
return use;
}
return n;
}
private Node translateExtendedFor(ExtendedFor n, List<String> labels) throws SemanticException {
if (n.expr().type().isArray()) {
return translateExtForArray(n, labels);
}
Position pos = Position.compilerGenerated();
Type iterType = ts.typeForName("java.util.Iterator");
Type iteratedType = n.decl().type().type();
// translate "L1,...,Ln: for (C x: e) b" to
// "{ Iterator iter = e.iterator(); L1,...,Ln: while (iter.hasNext();) { C x = (C)iter.next();
// b }"
// Create the iter declaration "Iterator iter = e.iterator()"
Id iterName = freshName("iter");
LocalDecl iterDecl;
LocalInstance iterLI = ts.localInstance(pos, Flags.NONE, iterType, iterName.id());
{
Id id = nodeFactory().Id(pos, "iterator");
Call iterator = nodeFactory().Call(pos, n.expr(), id);
iterator = (Call) iterator.type(iterType);
iterator =
iterator.methodInstance(
ts.findMethod(
n.expr().type().toClass(),
"iterator",
Collections.<Type>emptyList(),
this.context().currentClass()));
iterDecl =
nodeFactory()
.LocalDecl(
pos,
Flags.NONE,
nodeFactory().CanonicalTypeNode(pos, iterType),
iterName,
iterator);
iterDecl = iterDecl.localInstance(iterLI);
}
// create the loop body
List<Stmt> loopBody = new ArrayList<Stmt>();
{
Id id = nodeFactory().Id(pos, "next");
Call call =
nodeFactory()
.Call(
pos,
((Local) nodeFactory().Local(pos, iterName).type(iterType))
.localInstance(iterDecl.localInstance()),
id);
call = (Call) call.type(ts.Object());
call =
call.methodInstance(
ts.findMethod(
iterType.toClass(),
"next",
Collections.<Type>emptyList(),
this.context().currentClass()));
Cast cast = nodeFactory().Cast(pos, nodeFactory().CanonicalTypeNode(pos, iteratedType), call);
cast = (Cast) cast.type(iteratedType);
loopBody.add(n.decl().init(cast));
loopBody.add(n.body());
}
// create the while loop
While loop;
{
Id id = nodeFactory().Id(pos, "hasNext");
Call cond =
nodeFactory()
.Call(
pos,
((Local) nodeFactory().Local(pos, iterName).type(iterType))
.localInstance(iterDecl.localInstance()),
id);
cond = (Call) cond.type(ts.Boolean());
cond =
cond.methodInstance(
ts.findMethod(
iterType.toClass(),
"hasNext",
Collections.<Type>emptyList(),
this.context().currentClass()));
loop = nodeFactory().While(pos, cond, nodeFactory().Block(pos, loopBody));
}
return nodeFactory().Block(pos, iterDecl, labelStmt(loop, labels));
}
private Node translateExtForArray(ExtendedFor n, List<String> labels) throws SemanticException {
Position pos = Position.compilerGenerated();
Type iteratedType = n.decl().type().type();
// translate "L1,...,Ln: for (C x: e) b" to
// "{ C[] arr = e; int iter = 0; L1,...,Ln: while (iter < arr.length) { C x = arr[iter]; b ;
// iter = iter + 1; }"
List<Stmt> stmts = new ArrayList<Stmt>();
// add the declaration of arr: "C[] arr = e"
Id arrID = freshName("arr");
LocalInstance arrLI = ts.localInstance(pos, Flags.NONE, n.expr().type(), arrID.id());
{
LocalDecl ld =
nodeFactory()
.LocalDecl(
pos, Flags.NONE, nodeFactory().CanonicalTypeNode(pos, arrLI.type()), arrID);
ld = ld.localInstance(arrLI);
ld = ld.init(n.expr());
stmts.add(ld);
}
// add the declaration of iterator: "int iter = 0"
Id iterID = freshName("iter");
LocalInstance iterLI = ts.localInstance(pos, Flags.NONE, ts.Int(), iterID.id());
{
LocalDecl ld =
nodeFactory()
.LocalDecl(
pos, Flags.NONE, nodeFactory().CanonicalTypeNode(pos, iterLI.type()), iterID);
ld = ld.localInstance(iterLI);
ld = ld.init(nodeFactory().IntLit(pos, IntLit.INT, 0).type(ts.Int()));
stmts.add(ld);
}
// build the conditional "iter < arr.length"
Expr cond;
{
Local iterLocal =
(Local) nodeFactory().Local(pos, iterID).localInstance(iterLI).type(ts.Int());
Local arrLocal =
(Local) nodeFactory().Local(pos, arrID).localInstance(arrLI).type(arrLI.type());
Id id = nodeFactory().Id(pos, "length");
Field field = (Field) nodeFactory().Field(pos, arrLocal, id).type(ts.Int());
field = field.fieldInstance(ts.findField(arrLI.type().toReference(), "length"));
cond = nodeFactory().Binary(pos, iterLocal, Binary.LT, field).type(ts.Boolean());
}
// build the initlizer for the local decl: arr[iter]
Expr init;
{
Local iterLocal =
(Local) nodeFactory().Local(pos, iterID).localInstance(iterLI).type(ts.Int());
Local arrLocal =
(Local) nodeFactory().Local(pos, arrID).localInstance(arrLI).type(arrLI.type());
init = nodeFactory().ArrayAccess(pos, arrLocal, iterLocal);
init = init.type(iteratedType);
}
// build the increment for iter (iter = iter + 1;)
Stmt inc;
{
Local iterLocal =
(Local) nodeFactory().Local(pos, iterID).localInstance(iterLI).type(ts.Int());
Expr incExpr =
nodeFactory()
.Binary(
pos,
iterLocal.type(ts.Int()),
Binary.ADD,
nodeFactory().IntLit(pos, IntLit.INT, 1).type(ts.Int()))
.type(ts.Int());
Assign incStore =
(Assign) nodeFactory().Assign(pos, iterLocal, Assign.ASSIGN, incExpr).type(ts.Int());
inc = nodeFactory().Eval(pos, incStore);
}
// build the while loop
{
// Create a new loop body from the old body followed by the increment
Block loopBody = nodeFactory().Block(pos, n.decl().init(init), n.body(), inc);
While loop = nodeFactory().While(pos, cond, loopBody);
stmts.add(labelStmt(loop, labels));
}
return nodeFactory().Block(pos, stmts);
}