Examples with BeginLockScopeNode org.graalvm.compiler.hotspot.nodes.BeginLockScopeNode used on opensource projects

Example 1 with BeginLockScopeNode

use of org.graalvm.compiler.hotspot.nodes.BeginLockScopeNode in project graal by oracle.

the class DefaultHotSpotLoweringProvider method lowerOSRStartNode.

private void lowerOSRStartNode(OSRStartNode osrStart) {
    StructuredGraph graph = osrStart.graph();
    if (graph.getGuardsStage() == StructuredGraph.GuardsStage.FIXED_DEOPTS) {
        StartNode newStart = graph.add(new StartNode());
        ParameterNode buffer = graph.addWithoutUnique(new ParameterNode(0, StampPair.createSingle(StampFactory.forKind(runtime.getTarget().wordJavaKind))));
        ForeignCallNode migrationEnd = graph.add(new ForeignCallNode(foreignCalls, OSR_MIGRATION_END, buffer));
        migrationEnd.setStateAfter(osrStart.stateAfter());
        newStart.setNext(migrationEnd);
        FixedNode next = osrStart.next();
        osrStart.setNext(null);
        migrationEnd.setNext(next);
        graph.setStart(newStart);
        final int wordSize = target.wordSize;
        // @formatter:off
        // taken from c2 locals_addr = osr_buf + (max_locals-1)*wordSize)
        // @formatter:on
        int localsOffset = (graph.method().getMaxLocals() - 1) * wordSize;
        for (OSRLocalNode osrLocal : graph.getNodes(OSRLocalNode.TYPE)) {
            int size = osrLocal.getStackKind().getSlotCount();
            int offset = localsOffset - (osrLocal.index() + size - 1) * wordSize;
            AddressNode address = createOffsetAddress(graph, buffer, offset);
            ReadNode load = graph.add(new ReadNode(address, any(), osrLocal.stamp(NodeView.DEFAULT), BarrierType.NONE));
            osrLocal.replaceAndDelete(load);
            graph.addBeforeFixed(migrationEnd, load);
        }
        // @formatter:off
        // taken from c2 monitors_addr = osr_buf + (max_locals+mcnt*2-1)*wordSize);
        // @formatter:on
        final int lockCount = osrStart.stateAfter().locksSize();
        final int locksOffset = (graph.method().getMaxLocals() + lockCount * 2 - 1) * wordSize;
        // buffer
        for (OSRMonitorEnterNode osrMonitorEnter : graph.getNodes(OSRMonitorEnterNode.TYPE)) {
            MonitorIdNode monitorID = osrMonitorEnter.getMonitorId();
            OSRLockNode lock = (OSRLockNode) osrMonitorEnter.object();
            final int index = lock.index();
            final int offsetDisplacedHeader = locksOffset - ((index * 2) + 1) * wordSize;
            final int offsetLockObject = locksOffset - index * 2 * wordSize;
            // load the displaced mark from the osr buffer
            AddressNode addressDisplacedHeader = createOffsetAddress(graph, buffer, offsetDisplacedHeader);
            ReadNode loadDisplacedHeader = graph.add(new ReadNode(addressDisplacedHeader, any(), lock.stamp(NodeView.DEFAULT), BarrierType.NONE));
            graph.addBeforeFixed(migrationEnd, loadDisplacedHeader);
            // we need to initialize the stack slot for the lock
            BeginLockScopeNode beginLockScope = graph.add(new BeginLockScopeNode(lock.getStackKind(), monitorID.getLockDepth()));
            graph.addBeforeFixed(migrationEnd, beginLockScope);
            // write the displaced mark to the correct stack slot
            AddressNode addressDisplacedMark = createOffsetAddress(graph, beginLockScope, runtime.getVMConfig().basicLockDisplacedHeaderOffset);
            WriteNode writeStackSlot = graph.add(new WriteNode(addressDisplacedMark, DISPLACED_MARK_WORD_LOCATION, loadDisplacedHeader, BarrierType.NONE));
            graph.addBeforeFixed(migrationEnd, writeStackSlot);
            // load the lock object from the osr buffer
            AddressNode addressLockObject = createOffsetAddress(graph, buffer, offsetLockObject);
            ReadNode loadObject = graph.add(new ReadNode(addressLockObject, any(), lock.stamp(NodeView.DEFAULT), BarrierType.NONE));
            lock.replaceAndDelete(loadObject);
            graph.addBeforeFixed(migrationEnd, loadObject);
        }
        osrStart.replaceAtUsagesAndDelete(newStart);
    }
}