/**
* Run all jobs in the work list (and any children they have) to completion. This method returns
* <code>true</code> if all jobs were successfully completed. If all jobs were successfully
* completed, then the worklist will be empty.
*
* <p>The scheduling of <code>Job</code>s uses two methods to maintain scheduling invariants:
* <code>selectJobFromWorklist</code> selects a <code>SourceJob</code> from <code>worklist</code>
* (a list of jobs that still need to be processed); <code>enforceInvariants</code> is called
* before a pass is performed on a <code>SourceJob</code> and is responsible for ensuring all
* dependencies are satisfied before the pass proceeds, i.e. enforcing any scheduling invariants.
*/
public boolean runToCompletion() {
boolean okay = true;
while (okay && !worklist.isEmpty()) {
SourceJob job = selectJobFromWorklist();
if (Report.should_report(Report.frontend, 1)) {
Report.report(1, "Running job " + job);
}
okay &= runAllPasses(job);
if (job.completed()) {
// the job has finished. Let's remove it from the map so it
// can be garbage collected, and free up the AST.
jobs.put(job.source(), COMPLETED_JOB);
if (Report.should_report(Report.frontend, 1)) {
Report.report(1, "Completed job " + job);
}
} else {
// the job is not yet completed (although, it really
// should be...)
if (Report.should_report(Report.frontend, 1)) {
Report.report(1, "Failed to complete job " + job);
}
worklist.add(job);
}
}
if (Report.should_report(Report.frontend, 1))
Report.report(1, "Finished all passes -- " + (okay ? "okay" : "failed"));
return okay;
}
/**
* Add a new <code>SourceJob</code> for the <code>Source source</code>, with AST <code>ast</code>.
* A new job will be created if needed. If the <code>Source source</code> has already been
* processed, and its job discarded to release resources, then <code>null</code> will be returned.
*/
public SourceJob addJob(Source source, Node ast) {
Object o = jobs.get(source);
SourceJob job = null;
if (o == COMPLETED_JOB) {
// the job has already been completed.
// We don't need to add a job
return null;
} else if (o == null) {
// No appropriate job yet exists, we will create one.
job = this.createSourceJob(source, ast);
// record the job in the map and the worklist.
jobs.put(source, job);
worklist.addLast(job);
if (Report.should_report(Report.frontend, 3)) {
Report.report(3, "Adding job for " + source + " at the " + "request of job " + currentJob);
}
} else {
job = (SourceJob) o;
}
// if the current source job caused this job to load, record the
// dependency.
if (currentJob instanceof SourceJob) {
((SourceJob) currentJob).addDependency(source);
}
return job;
}
