Examples with EntryMarkerNode org.graalvm.compiler.nodes.EntryMarkerNode used on opensource projects

Example 1 with EntryMarkerNode

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

the class OnStackReplacementPhase method run.

@Override
@SuppressWarnings("try")
protected void run(StructuredGraph graph) {
    DebugContext debug = graph.getDebug();
    if (graph.getEntryBCI() == JVMCICompiler.INVOCATION_ENTRY_BCI) {
        // used.
        assert graph.getNodes(EntryMarkerNode.TYPE).isEmpty();
        return;
    }
    debug.dump(DebugContext.DETAILED_LEVEL, graph, "OnStackReplacement initial at bci %d", graph.getEntryBCI());
    EntryMarkerNode osr;
    int maxIterations = -1;
    int iterations = 0;
    final EntryMarkerNode originalOSRNode = getEntryMarker(graph);
    final LoopBeginNode originalOSRLoop = osrLoop(originalOSRNode);
    final boolean currentOSRWithLocks = osrWithLocks(originalOSRNode);
    if (originalOSRLoop == null) {
        /*
             * OSR with Locks: We do not have an OSR loop for the original OSR bci. Therefore we
             * cannot decide where to deopt and which framestate will be used. In the worst case the
             * framestate of the OSR entry would be used.
             */
        throw new PermanentBailoutException("OSR compilation without OSR entry loop.");
    }
    if (!supportOSRWithLocks(graph.getOptions()) && currentOSRWithLocks) {
        throw new PermanentBailoutException("OSR with locks disabled.");
    }
    do {
        osr = getEntryMarker(graph);
        LoopsData loops = new LoopsData(graph);
        // Find the loop that contains the EntryMarker
        Loop<Block> l = loops.getCFG().getNodeToBlock().get(osr).getLoop();
        if (l == null) {
            break;
        }
        iterations++;
        if (maxIterations == -1) {
            maxIterations = l.getDepth();
        } else if (iterations > maxIterations) {
            throw GraalError.shouldNotReachHere();
        }
        // Peel the outermost loop first
        while (l.getParent() != null) {
            l = l.getParent();
        }
        LoopTransformations.peel(loops.loop(l));
        osr.replaceAtUsages(InputType.Guard, AbstractBeginNode.prevBegin((FixedNode) osr.predecessor()));
        for (Node usage : osr.usages().snapshot()) {
            EntryProxyNode proxy = (EntryProxyNode) usage;
            proxy.replaceAndDelete(proxy.value());
        }
        GraphUtil.removeFixedWithUnusedInputs(osr);
        debug.dump(DebugContext.DETAILED_LEVEL, graph, "OnStackReplacement loop peeling result");
    } while (true);
    StartNode start = graph.start();
    FrameState osrState = osr.stateAfter();
    OSRStartNode osrStart;
    try (DebugCloseable context = osr.withNodeSourcePosition()) {
        osr.setStateAfter(null);
        osrStart = graph.add(new OSRStartNode());
        FixedNode next = osr.next();
        osr.setNext(null);
        osrStart.setNext(next);
        graph.setStart(osrStart);
        osrStart.setStateAfter(osrState);
        debug.dump(DebugContext.DETAILED_LEVEL, graph, "OnStackReplacement after setting OSR start");
        final int localsSize = osrState.localsSize();
        final int locksSize = osrState.locksSize();
        for (int i = 0; i < localsSize + locksSize; i++) {
            ValueNode value = null;
            if (i >= localsSize) {
                value = osrState.lockAt(i - localsSize);
            } else {
                value = osrState.localAt(i);
            }
            if (value instanceof EntryProxyNode) {
                EntryProxyNode proxy = (EntryProxyNode) value;
                /*
                     * We need to drop the stamp since the types we see during OSR may be too
                     * precise (if a branch was not parsed for example). In cases when this is
                     * possible, we insert a guard and narrow the OSRLocal stamp at its usages.
                     */
                Stamp narrowedStamp = proxy.value().stamp(NodeView.DEFAULT);
                Stamp unrestrictedStamp = proxy.stamp(NodeView.DEFAULT).unrestricted();
                ValueNode osrLocal;
                if (i >= localsSize) {
                    osrLocal = graph.addOrUnique(new OSRLockNode(i - localsSize, unrestrictedStamp));
                } else {
                    osrLocal = graph.addOrUnique(new OSRLocalNode(i, unrestrictedStamp));
                }
                // Speculate on the OSRLocal stamps that could be more precise.
                OSRLocalSpeculationReason reason = new OSRLocalSpeculationReason(osrState.bci, narrowedStamp, i);
                if (graph.getSpeculationLog().maySpeculate(reason) && osrLocal instanceof OSRLocalNode && value.getStackKind().equals(JavaKind.Object) && !narrowedStamp.isUnrestricted()) {
                    // Add guard.
                    LogicNode check = graph.addOrUniqueWithInputs(InstanceOfNode.createHelper((ObjectStamp) narrowedStamp, osrLocal, null, null));
                    JavaConstant constant = graph.getSpeculationLog().speculate(reason);
                    FixedGuardNode guard = graph.add(new FixedGuardNode(check, DeoptimizationReason.OptimizedTypeCheckViolated, DeoptimizationAction.InvalidateRecompile, constant, false));
                    graph.addAfterFixed(osrStart, guard);
                    // Replace with a more specific type at usages.
                    // We know that we are at the root,
                    // so we need to replace the proxy in the state.
                    proxy.replaceAtMatchingUsages(osrLocal, n -> n == osrState);
                    osrLocal = graph.addOrUnique(new PiNode(osrLocal, narrowedStamp, guard));
                }
                proxy.replaceAndDelete(osrLocal);
            } else {
                assert value == null || value instanceof OSRLocalNode;
            }
        }
        osr.replaceAtUsages(InputType.Guard, osrStart);
    }
    debug.dump(DebugContext.DETAILED_LEVEL, graph, "OnStackReplacement after replacing entry proxies");
    GraphUtil.killCFG(start);
    debug.dump(DebugContext.DETAILED_LEVEL, graph, "OnStackReplacement result");
    new DeadCodeEliminationPhase(Required).apply(graph);
    if (currentOSRWithLocks) {
        OsrWithLocksCount.increment(debug);
        try (DebugCloseable context = osrStart.withNodeSourcePosition()) {
            for (int i = osrState.monitorIdCount() - 1; i >= 0; --i) {
                MonitorIdNode id = osrState.monitorIdAt(i);
                ValueNode lockedObject = osrState.lockAt(i);
                OSRMonitorEnterNode osrMonitorEnter = graph.add(new OSRMonitorEnterNode(lockedObject, id));
                for (Node usage : id.usages()) {
                    if (usage instanceof AccessMonitorNode) {
                        AccessMonitorNode access = (AccessMonitorNode) usage;
                        access.setObject(lockedObject);
                    }
                }
                FixedNode oldNext = osrStart.next();
                oldNext.replaceAtPredecessor(null);
                osrMonitorEnter.setNext(oldNext);
                osrStart.setNext(osrMonitorEnter);
            }
        }
        debug.dump(DebugContext.DETAILED_LEVEL, graph, "After inserting OSR monitor enters");
        /*
             * Ensure balanced monitorenter - monitorexit
             *
             * Ensure that there is no monitor exit without a monitor enter in the graph. If there
             * is one this can only be done by bytecode as we have the monitor enter before the OSR
             * loop but the exit in a path of the loop that must be under a condition, else it will
             * throw an IllegalStateException anyway in the 2.iteration
             */
        for (MonitorExitNode exit : graph.getNodes(MonitorExitNode.TYPE)) {
            MonitorIdNode id = exit.getMonitorId();
            if (id.usages().filter(MonitorEnterNode.class).count() != 1) {
                throw new PermanentBailoutException("Unbalanced monitor enter-exit in OSR compilation with locks. Object is locked before the loop but released inside the loop.");
            }
        }
    }
    debug.dump(DebugContext.DETAILED_LEVEL, graph, "OnStackReplacement result");
    new DeadCodeEliminationPhase(Required).apply(graph);
    /*
         * There must not be any parameter nodes left after OSR compilation.
         */
    assert graph.getNodes(ParameterNode.TYPE).count() == 0 : "OSR Compilation contains references to parameters.";
}

Example 2 with EntryMarkerNode

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

the class BytecodeParser method iterateBytecodesForBlock.

@SuppressWarnings("try")
protected void iterateBytecodesForBlock(BciBlock block) {
    if (block.isLoopHeader) {
        // Create the loop header block, which later will merge the backward branches of
        // the loop.
        controlFlowSplit = true;
        LoopBeginNode loopBegin = appendLoopBegin(this.lastInstr, block.startBci);
        lastInstr = loopBegin;
        // Create phi functions for all local variables and operand stack slots.
        frameState.insertLoopPhis(liveness, block.loopId, loopBegin, forceLoopPhis(), stampFromValueForForcedPhis());
        loopBegin.setStateAfter(createFrameState(block.startBci, loopBegin));
        /*
             * We have seen all forward branches. All subsequent backward branches will merge to the
             * loop header. This ensures that the loop header has exactly one non-loop predecessor.
             */
        setFirstInstruction(block, loopBegin);
        /*
             * We need to preserve the frame state builder of the loop header so that we can merge
             * values for phi functions, so make a copy of it.
             */
        setEntryState(block, frameState.copy());
        debug.log("  created loop header %s", loopBegin);
    } else if (lastInstr instanceof MergeNode) {
        /*
             * All inputs of non-loop phi nodes are known by now. We can infer the stamp for the
             * phi, so that parsing continues with more precise type information.
             */
        frameState.inferPhiStamps((AbstractMergeNode) lastInstr);
    }
    assert lastInstr.next() == null : "instructions already appended at block " + block;
    debug.log("  frameState: %s", frameState);
    lastInstr = finishInstruction(lastInstr, frameState);
    int endBCI = stream.endBCI();
    stream.setBCI(block.startBci);
    int bci = block.startBci;
    BytecodesParsed.add(debug, block.endBci - bci);
    /* Reset line number for new block */
    if (graphBuilderConfig.insertFullInfopoints()) {
        previousLineNumber = -1;
    }
    while (bci < endBCI) {
        try (DebugCloseable context = openNodeContext()) {
            if (graphBuilderConfig.insertFullInfopoints() && !parsingIntrinsic()) {
                currentLineNumber = lnt != null ? lnt.getLineNumber(bci) : -1;
                if (currentLineNumber != previousLineNumber) {
                    genInfoPointNode(InfopointReason.BYTECODE_POSITION, null);
                    previousLineNumber = currentLineNumber;
                }
            }
            // read the opcode
            int opcode = stream.currentBC();
            assert traceState();
            assert traceInstruction(bci, opcode, bci == block.startBci);
            if (parent == null && bci == entryBCI) {
                if (block.getJsrScope() != JsrScope.EMPTY_SCOPE) {
                    throw new JsrNotSupportedBailout("OSR into a JSR scope is not supported");
                }
                EntryMarkerNode x = append(new EntryMarkerNode());
                frameState.insertProxies(value -> graph.unique(new EntryProxyNode(value, x)));
                x.setStateAfter(createFrameState(bci, x));
            }
            processBytecode(bci, opcode);
        } catch (BailoutException e) {
            // Don't wrap bailouts as parser errors
            throw e;
        } catch (Throwable e) {
            throw throwParserError(e);
        }
        if (lastInstr == null || lastInstr.next() != null) {
            break;
        }
        stream.next();
        bci = stream.currentBCI();
        assert block == currentBlock;
        assert checkLastInstruction();
        lastInstr = finishInstruction(lastInstr, frameState);
        if (bci < endBCI) {
            if (bci > block.endBci) {
                assert !block.getSuccessor(0).isExceptionEntry;
                assert block.numNormalSuccessors() == 1;
                // we fell through to the next block, add a goto and break
                appendGoto(block.getSuccessor(0));
                break;
            }
        }
    }
}

Example 3 with EntryMarkerNode

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

the class OnStackReplacementPhase method getEntryMarker.

private static EntryMarkerNode getEntryMarker(StructuredGraph graph) {
    NodeIterable<EntryMarkerNode> osrNodes = graph.getNodes(EntryMarkerNode.TYPE);
    EntryMarkerNode osr = osrNodes.first();
    if (osr == null) {
        throw new PermanentBailoutException("No OnStackReplacementNode generated");
    }
    if (osrNodes.count() > 1) {
        throw new GraalError("Multiple OnStackReplacementNodes generated");
    }
    if (osr.stateAfter().stackSize() != 0) {
        throw new PermanentBailoutException("OSR with stack entries not supported: %s", osr.stateAfter().toString(Verbosity.Debugger));
    }
    return osr;
}