if (createScopeObjects &&
(type == Token.BLOCK || type == Token.LOOP ||
type == Token.ARRAYCOMP) &&
(node instanceof Scope))
{
Scope newScope = (Scope) node;
if (newScope.getSymbolTable() != null) {
// transform to let statement so we get a with statement
// created to contain scoped let variables
Node let = new Node(type == Token.ARRAYCOMP ? Token.LETEXPR
: Token.LET);
Node innerLet = new Node(Token.LET);
let.addChildToBack(innerLet);
for (String name: newScope.getSymbolTable().keySet()) {
innerLet.addChildToBack(Node.newString(Token.NAME, name));
}
newScope.setSymbolTable(null); // so we don't transform again
Node oldNode = node;
node = replaceCurrent(parent, previous, node, let);
type = node.getType();
let.addChildToBack(oldNode);
}
}
switch (type) {
case Token.LABEL:
case Token.SWITCH:
case Token.LOOP:
loops.push(node);
loopEnds.push(((Jump)node).target);
break;
case Token.WITH:
{
loops.push(node);
Node leave = node.getNext();
if (leave.getType() != Token.LEAVEWITH) {
Kit.codeBug();
}
loopEnds.push(leave);
break;
}
case Token.TRY:
{
Jump jump = (Jump)node;
Node finallytarget = jump.getFinally();
if (finallytarget != null) {
hasFinally = true;
loops.push(node);
loopEnds.push(finallytarget);
}
break;
}
case Token.TARGET:
case Token.LEAVEWITH:
if (!loopEnds.isEmpty() && loopEnds.peek() == node) {
loopEnds.pop();
loops.pop();
}
break;
case Token.YIELD:
((FunctionNode)tree).addResumptionPoint(node);
break;
case Token.RETURN:
{
boolean isGenerator = tree.getType() == Token.FUNCTION
&& ((FunctionNode)tree).isGenerator();
if (isGenerator) {
node.putIntProp(Node.GENERATOR_END_PROP, 1);
}
/* If we didn't support try/finally, it wouldn't be
* necessary to put LEAVEWITH nodes here... but as
* we do need a series of JSR FINALLY nodes before
* each RETURN, we need to ensure that each finally
* block gets the correct scope... which could mean
* that some LEAVEWITH nodes are necessary.
*/
if (!hasFinally)
break; // skip the whole mess.
Node unwindBlock = null;
for (int i=loops.size()-1; i >= 0; i--) {
Node n = (Node) loops.get(i);
int elemtype = n.getType();
if (elemtype == Token.TRY || elemtype == Token.WITH) {
Node unwind;
if (elemtype == Token.TRY) {
Jump jsrnode = new Jump(Token.JSR);
Node jsrtarget = ((Jump)n).getFinally();
jsrnode.target = jsrtarget;
unwind = jsrnode;
} else {
unwind = new Node(Token.LEAVEWITH);
}
if (unwindBlock == null) {
unwindBlock = new Node(Token.BLOCK,
node.getLineno());
}
unwindBlock.addChildToBack(unwind);
}
}
if (unwindBlock != null) {
Node returnNode = node;
Node returnExpr = returnNode.getFirstChild();
node = replaceCurrent(parent, previous, node, unwindBlock);
if (returnExpr == null || isGenerator) {
unwindBlock.addChildToBack(returnNode);
} else {
Node store = new Node(Token.EXPR_RESULT, returnExpr);
unwindBlock.addChildToFront(store);
returnNode = new Node(Token.RETURN_RESULT);
unwindBlock.addChildToBack(returnNode);
// transform return expression
transformCompilationUnit_r(tree, store, scope,
createScopeObjects,
inStrictMode);
}
// skip transformCompilationUnit_r to avoid infinite loop
continue siblingLoop;
}
break;
}
case Token.BREAK:
case Token.CONTINUE:
{
Jump jump = (Jump)node;
Jump jumpStatement = jump.getJumpStatement();
if (jumpStatement == null) Kit.codeBug();
for (int i = loops.size(); ;) {
if (i == 0) {
// Parser/IRFactory ensure that break/continue
// always has a jump statement associated with it
// which should be found
throw Kit.codeBug();
}
--i;
Node n = (Node) loops.get(i);
if (n == jumpStatement) {
break;
}
int elemtype = n.getType();
if (elemtype == Token.WITH) {
Node leave = new Node(Token.LEAVEWITH);
previous = addBeforeCurrent(parent, previous, node,
leave);
} else if (elemtype == Token.TRY) {
Jump tryNode = (Jump)n;
Jump jsrFinally = new Jump(Token.JSR);
jsrFinally.target = tryNode.getFinally();
previous = addBeforeCurrent(parent, previous, node,
jsrFinally);
}
}
if (type == Token.BREAK) {
jump.target = jumpStatement.target;
} else {
jump.target = jumpStatement.getContinue();
}
jump.setType(Token.GOTO);
break;
}
case Token.CALL:
visitCall(node, tree);
break;
case Token.NEW:
visitNew(node, tree);
break;
case Token.LETEXPR:
case Token.LET: {
Node child = node.getFirstChild();
if (child.getType() == Token.LET) {
// We have a let statement or expression rather than a
// let declaration
boolean createWith = tree.getType() != Token.FUNCTION
|| ((FunctionNode)tree).requiresActivation();
node = visitLet(createWith, parent, previous, node);
break;
} else {
// fall through to process let declaration...
}
}
/* fall through */
case Token.CONST:
case Token.VAR:
{
Node result = new Node(Token.BLOCK);
for (Node cursor = node.getFirstChild(); cursor != null;) {
// Move cursor to next before createAssignment gets chance
// to change n.next
Node n = cursor;
cursor = cursor.getNext();
if (n.getType() == Token.NAME) {
if (!n.hasChildren())
continue;
Node init = n.getFirstChild();
n.removeChild(init);
n.setType(Token.BINDNAME);
n = new Node(type == Token.CONST ?
Token.SETCONST :
Token.SETNAME,
n, init);
} else {
// May be a destructuring assignment already transformed
// to a LETEXPR
if (n.getType() != Token.LETEXPR)
throw Kit.codeBug();
}
Node pop = new Node(Token.EXPR_VOID, n, node.getLineno());
result.addChildToBack(pop);
}
node = replaceCurrent(parent, previous, node, result);
break;
}
case Token.TYPEOFNAME: {
Scope defining = scope.getDefiningScope(node.getString());
if (defining != null) {
node.setScope(defining);
}
}
break;
case Token.TYPEOF:
case Token.IFNE: {
/* We want to suppress warnings for undefined property o.p
* for the following constructs: typeof o.p, if (o.p),
* if (!o.p), if (o.p == undefined), if (undefined == o.p)
*/
Node child = node.getFirstChild();
if (type == Token.IFNE) {
while (child.getType() == Token.NOT) {
child = child.getFirstChild();
}
if (child.getType() == Token.EQ ||
child.getType() == Token.NE)
{
Node first = child.getFirstChild();
Node last = child.getLastChild();
if (first.getType() == Token.NAME &&
first.getString().equals("undefined"))
child = last;
else if (last.getType() == Token.NAME &&
last.getString().equals("undefined"))
child = first;
}
}
if (child.getType() == Token.GETPROP)
child.setType(Token.GETPROPNOWARN);
break;
}
case Token.SETNAME:
if (inStrictMode) {
node.setType(Token.STRICT_SETNAME);
}
/* fall through */
case Token.NAME:
case Token.SETCONST:
case Token.DELPROP:
{
// Turn name to var for faster access if possible
if (createScopeObjects) {
break;
}
Node nameSource;
if (type == Token.NAME) {
nameSource = node;
} else {
nameSource = node.getFirstChild();
if (nameSource.getType() != Token.BINDNAME) {
if (type == Token.DELPROP) {
break;
}
throw Kit.codeBug();
}
}
if (nameSource.getScope() != null) {
break; // already have a scope set
}
String name = nameSource.getString();
Scope defining = scope.getDefiningScope(name);
if (defining != null) {
nameSource.setScope(defining);
if (type == Token.NAME) {
node.setType(Token.GETVAR);
} else if (type == Token.SETNAME ||