/**
* Gets the must reaching definition of a given node. The node must be one of the control flow
* graph nodes.
*
* @param name name of the variable. It can only be names of local variable that are not function
* parameters, escaped variables or variables declared in catch.
* @param useNode the location of the use where the definition reaches.
*/
Node getDef(String name, Node useNode) {
Preconditions.checkArgument(getCfg().hasNode(useNode));
GraphNode<Node, Branch> n = getCfg().getNode(useNode);
FlowState<MustDef> state = n.getAnnotation();
Definition def = state.getIn().reachingDef.get(jsScope.getVar(name));
if (def == null) {
return null;
} else {
return def.node;
}
}
@Override
public void initialInboundWindowSize(int newWindowSize) throws Http2Exception {
int deltaWindowSize = newWindowSize - initialWindowSize;
initialWindowSize = newWindowSize;
// Apply the delta to all of the windows.
connectionState.addAndGet(deltaWindowSize);
for (FlowState window : streamStates.values()) {
window.updatedInitialWindowSize(deltaWindowSize);
}
}
boolean dependsOnOuterScopeVars(String name, Node useNode) {
Preconditions.checkArgument(getCfg().hasNode(useNode));
GraphNode<Node, Branch> n = getCfg().getNode(useNode);
FlowState<MustDef> state = n.getAnnotation();
Definition def = state.getIn().reachingDef.get(jsScope.getVar(name));
for (Var s : def.depends) {
if (s.scope != jsScope) {
return true;
}
}
return false;
}
/** Apply connection-wide flow control to the incoming data frame. */
private void applyConnectionFlowControl(int dataLength, FrameWriter frameWriter)
throws Http2Exception {
// Remove the data length from the available window size. Throw if the lower bound
// was exceeded.
connectionState.addAndGet(-dataLength);
// If less than the window update threshold remains, restore the window size
// to the initial value and send a window update to the remote endpoint indicating
// the new window size.
if (connectionState.windowSize() <= getWindowUpdateThreshold()) {
connectionState.updateWindow(frameWriter);
}
}
/** Apply stream-based flow control to the incoming data frame. */
private void applyStreamFlowControl(
int streamId, int dataLength, boolean endOfStream, FrameWriter frameWriter)
throws Http2Exception {
// Remove the data length from the available window size. Throw if the lower bound
// was exceeded.
FlowState state = getStateOrFail(streamId);
state.addAndGet(-dataLength);
// If less than the window update threshold remains, restore the window size
// to the initial value and send a window update to the remote endpoint indicating
// the new window size.
if (state.windowSize() <= getWindowUpdateThreshold() && !endOfStream) {
state.updateWindow(frameWriter);
}
}
