/**
* Connects cfgNode to the proper CATCH block if target subtree might throw an exception. If there
* are FINALLY blocks reached before a CATCH, it will make the corresponding entry in finallyMap.
*/
private void connectToPossibleExceptionHandler(Node cfgNode, Node target) {
if (mayThrowException(target) && !exceptionHandler.isEmpty()) {
Node lastJump = cfgNode;
for (Node handler : exceptionHandler) {
if (NodeUtil.isFunction(handler)) {
return;
}
Preconditions.checkState(handler.getType() == Token.TRY);
Node catchBlock = NodeUtil.getCatchBlock(handler);
if (!NodeUtil.hasCatchHandler(catchBlock)) { // No catch but a FINALLY.
if (lastJump == cfgNode) {
createEdge(cfgNode, Branch.ON_EX, handler.getLastChild());
} else {
finallyMap.put(lastJump, handler.getLastChild());
}
} else { // Has a catch.
if (lastJump == cfgNode) {
createEdge(cfgNode, Branch.ON_EX, catchBlock);
return;
} else {
finallyMap.put(lastJump, catchBlock);
}
}
lastJump = handler;
}
}
}
private void handleStmtList(Node node) {
Node parent = node.getParent();
// Special case, don't add a block of empty CATCH block to the graph.
if (node.getType() == Token.BLOCK
&& parent != null
&& parent.getType() == Token.TRY
&& NodeUtil.getCatchBlock(parent) == node
&& !NodeUtil.hasCatchHandler(node)) {
return;
}
// A block transfer control to its first child if it is not empty.
Node child = node.getFirstChild();
// Function declarations are skipped since control doesn't go into that
// function (unless it is called)
while (child != null && child.getType() == Token.FUNCTION) {
child = child.getNext();
}
if (child != null) {
createEdge(node, Branch.UNCOND, computeFallThrough(child));
} else {
createEdge(node, Branch.UNCOND, computeFollowNode(node));
}
// Synthetic blocks
if (parent != null) {
switch (parent.getType()) {
case Token.DEFAULT:
case Token.CASE:
case Token.TRY:
break;
default:
if (node.getType() == Token.BLOCK && node.isSyntheticBlock()) {
Node next = node.getLastChild();
if (next != null) {
createEdge(node, Branch.SYN_BLOCK, computeFallThrough(next));
}
}
break;
}
}
}