internal ContinuationJump(NativeContinuation c, Interpreter.CallFrame current)
{
this.capturedFrame = (Interpreter.CallFrame)c.GetImplementation();
if (this.capturedFrame == null || current == null)
{
// Continuation and current execution does not share
// any frames if there is nothing to capture or
// if there is no currently executed frames
this.branchFrame = null;
}
else
{
// Search for branch frame where parent frame chains starting
// from captured and current meet.
Interpreter.CallFrame chain1 = this.capturedFrame;
Interpreter.CallFrame chain2 = current;
// First work parents of chain1 or chain2 until the same
// frame depth.
int diff = chain1.frameIndex - chain2.frameIndex;
if (diff != 0)
{
if (diff < 0)
{
// swap to make sure that
// chain1.frameIndex > chain2.frameIndex and diff > 0
chain1 = current;
chain2 = this.capturedFrame;
diff = -diff;
}
do
{
chain1 = chain1.parentFrame;
}
while (--diff != 0);
if (chain1.frameIndex != chain2.frameIndex)
{
Kit.CodeBug();
}
}
// Now walk parents in parallel until a shared frame is found
// or until the root is reached.
while (chain1 != chain2 && chain1 != null)
{
chain1 = chain1.parentFrame;
chain2 = chain2.parentFrame;
}
this.branchFrame = chain1;
if (this.branchFrame != null && !this.branchFrame.frozen)
{
Kit.CodeBug();
}
}
}
public static object RestartContinuation(NativeContinuation c, Context cx, Scriptable scope, object[] args)
{
if (!ScriptRuntime.HasTopCall(cx))
{
return ScriptRuntime.DoTopCall(c, cx, scope, null, args);
}
object arg;
if (args.Length == 0)
{
arg = Undefined.instance;
}
else
{
arg = args[0];
}
Interpreter.CallFrame capturedFrame = (Interpreter.CallFrame)c.GetImplementation();
if (capturedFrame == null)
{
// No frames to restart
return arg;
}
Interpreter.ContinuationJump cjump = new Interpreter.ContinuationJump(c, null);
cjump.result = arg;
return InterpretLoop(cx, null, cjump);
}
