--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements/src/org/graalvm/compiler/replacements/CachingPEGraphDecoder.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.graalvm.compiler.replacements;
+
+import static org.graalvm.compiler.nodes.graphbuilderconf.IntrinsicContext.CompilationContext.INLINE_AFTER_PARSING;
+
+import org.graalvm.compiler.bytecode.BytecodeProvider;
+import org.graalvm.compiler.debug.DebugContext;
+import org.graalvm.compiler.java.GraphBuilderPhase;
+import org.graalvm.compiler.nodes.EncodedGraph;
+import org.graalvm.compiler.nodes.GraphEncoder;
+import org.graalvm.compiler.nodes.StructuredGraph;
+import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
+import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderConfiguration;
+import org.graalvm.compiler.nodes.graphbuilderconf.InlineInvokePlugin;
+import org.graalvm.compiler.nodes.graphbuilderconf.IntrinsicContext;
+import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugins;
+import org.graalvm.compiler.nodes.graphbuilderconf.LoopExplosionPlugin;
+import org.graalvm.compiler.nodes.graphbuilderconf.NodePlugin;
+import org.graalvm.compiler.nodes.graphbuilderconf.ParameterPlugin;
+import org.graalvm.compiler.phases.OptimisticOptimizations;
+import org.graalvm.compiler.phases.common.CanonicalizerPhase;
+import org.graalvm.compiler.phases.common.ConvertDeoptimizeToGuardPhase;
+import org.graalvm.compiler.phases.tiers.PhaseContext;
+import org.graalvm.compiler.phases.util.Providers;
+import org.graalvm.util.EconomicMap;
+
+import jdk.vm.ci.code.Architecture;
+import jdk.vm.ci.meta.ResolvedJavaMethod;
+
+/**
+ * A graph decoder that provides all necessary encoded graphs on-the-fly (by parsing the methods and
+ * encoding the graphs).
+ */
+public class CachingPEGraphDecoder extends PEGraphDecoder {
+
+    protected final Providers providers;
+    protected final GraphBuilderConfiguration graphBuilderConfig;
+    protected final OptimisticOptimizations optimisticOpts;
+    private final AllowAssumptions allowAssumptions;
+    private final EconomicMap<ResolvedJavaMethod, EncodedGraph> graphCache;
+
+    public CachingPEGraphDecoder(Architecture architecture, StructuredGraph graph, Providers providers, GraphBuilderConfiguration graphBuilderConfig, OptimisticOptimizations optimisticOpts,
+                    AllowAssumptions allowAssumptions, LoopExplosionPlugin loopExplosionPlugin, InvocationPlugins invocationPlugins, InlineInvokePlugin[] inlineInvokePlugins,
+                    ParameterPlugin parameterPlugin,
+                    NodePlugin[] nodePlugins) {
+        super(architecture, graph, providers.getMetaAccess(), providers.getConstantReflection(), providers.getConstantFieldProvider(), providers.getStampProvider(), loopExplosionPlugin,
+                        invocationPlugins, inlineInvokePlugins, parameterPlugin, nodePlugins);
+
+        this.providers = providers;
+        this.graphBuilderConfig = graphBuilderConfig;
+        this.optimisticOpts = optimisticOpts;
+        this.allowAssumptions = allowAssumptions;
+        this.graphCache = EconomicMap.create();
+    }
+
+    protected GraphBuilderPhase.Instance createGraphBuilderPhaseInstance(IntrinsicContext initialIntrinsicContext) {
+        return new GraphBuilderPhase.Instance(providers.getMetaAccess(), providers.getStampProvider(), providers.getConstantReflection(), providers.getConstantFieldProvider(), graphBuilderConfig,
+                        optimisticOpts, initialIntrinsicContext);
+    }
+
+    @SuppressWarnings("try")
+    private EncodedGraph createGraph(ResolvedJavaMethod method, BytecodeProvider intrinsicBytecodeProvider) {
+        StructuredGraph graphToEncode = new StructuredGraph.Builder(options, debug, allowAssumptions).useProfilingInfo(false).method(method).build();
+        try (DebugContext.Scope scope = debug.scope("createGraph", graphToEncode)) {
+            IntrinsicContext initialIntrinsicContext = intrinsicBytecodeProvider != null ? new IntrinsicContext(method, method, intrinsicBytecodeProvider, INLINE_AFTER_PARSING) : null;
+            GraphBuilderPhase.Instance graphBuilderPhaseInstance = createGraphBuilderPhaseInstance(initialIntrinsicContext);
+            graphBuilderPhaseInstance.apply(graphToEncode);
+
+            PhaseContext context = new PhaseContext(providers);
+            new CanonicalizerPhase().apply(graphToEncode, context);
+            /*
+             * ConvertDeoptimizeToGuardPhase reduces the number of merges in the graph, so that
+             * fewer frame states will be created. This significantly reduces the number of nodes in
+             * the initial graph.
+             */
+            new ConvertDeoptimizeToGuardPhase().apply(graphToEncode, context);
+
+            EncodedGraph encodedGraph = GraphEncoder.encodeSingleGraph(graphToEncode, architecture);
+            graphCache.put(method, encodedGraph);
+            return encodedGraph;
+
+        } catch (Throwable ex) {
+            throw debug.handle(ex);
+        }
+    }
+
+    @Override
+    protected EncodedGraph lookupEncodedGraph(ResolvedJavaMethod method, BytecodeProvider intrinsicBytecodeProvider) {
+        EncodedGraph result = graphCache.get(method);
+        if (result == null && method.hasBytecodes()) {
+            result = createGraph(method, intrinsicBytecodeProvider);
+        }
+        return result;
+    }
+}