MethodStatus compileForParallelExecution() {
// The kernel should be a self-hosted function.
if (!fun_->isFunction())
return Method_Skipped;
RootedFunction callee(cx_, fun_->toFunction());
if (!callee->isInterpreted() || !callee->isSelfHostedBuiltin())
return Method_Skipped;
if (callee->isInterpretedLazy() && !callee->initializeLazyScript(cx_))
return Method_Error;
// If this function has not been run enough to enable parallel
// execution, perform a warmup.
RootedScript script(cx_, callee->nonLazyScript());
if (script->getUseCount() < js_IonOptions.usesBeforeCompileParallel) {
if (!warmupForParallelExecution())
return Method_Error;
}
if (script->hasParallelIonScript() &&
!script->parallelIonScript()->hasInvalidatedCallTarget())
{
Spew(SpewOps, "Already compiled");
return Method_Compiled;
}
Spew(SpewOps, "Compiling all reachable functions");
ParallelCompileContext compileContext(cx_);
if (!compileContext.appendToWorklist(script))
return Method_Error;
MethodStatus status = compileContext.compileTransitively();
if (status != Method_Compiled)
return status;
// it can happen that during transitive compilation, our
// callee's parallel ion script is invalidated or GC'd. So
// before we declare success, double check that it's still
// compiled!
if (!callee->nonLazyScript()->hasParallelIonScript())
return Method_Skipped;
return Method_Compiled;
}
virtual bool parallel(ForkJoinSlice &slice) {
#ifndef JS_ION
JS_NOT_REACHED("Parallel execution without ion");
return false;
#else
Spew(SpewOps, "Up");
// Make a new IonContext for the slice, which is needed if we need to
// re-enter the VM.
IonContext icx(cx_, NULL);
JS_ASSERT(pendingInvalidations[slice.sliceId] == NULL);
JS_ASSERT(fun_->isFunction());
RootedFunction callee(cx_, fun_->toFunction());
if (!callee->nonLazyScript()->hasParallelIonScript()) {
// Sometimes, particularly with GCZeal, the parallel ion
// script can be collected between starting the parallel
// op and reaching this point. In that case, we just fail
// and fallback.
Spew(SpewOps, "Down (Script no longer present)");
return false;
}
ParallelIonInvoke<3> fii(cx_, callee, 3);
fii.args[0] = Int32Value(slice.sliceId);
fii.args[1] = Int32Value(slice.numSlices);
fii.args[2] = BooleanValue(false);
bool ok = fii.invoke(cx_);
JS_ASSERT(ok == !slice.abortedScript);
if (!ok) {
JSScript *script = slice.abortedScript;
Spew(SpewBailouts, "Aborted script: %p (hasParallelIonScript? %d)",
script, script->hasParallelIonScript());
JS_ASSERT(script->hasParallelIonScript());
pendingInvalidations[slice.sliceId] = script;
}
Spew(SpewOps, "Down");
return ok;
#endif // JS_ION
}