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/*
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* Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.phases.common.inlining.info.elem;
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import static org.graalvm.compiler.phases.common.DeadCodeEliminationPhase.Optionality.Optional;
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import java.util.ArrayList;
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import java.util.List;
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import org.graalvm.compiler.core.common.type.Stamp;
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import org.graalvm.compiler.debug.DebugContext;
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import org.graalvm.compiler.graph.Node;
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import org.graalvm.compiler.graph.NodeInputList;
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import org.graalvm.compiler.nodes.ConstantNode;
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import org.graalvm.compiler.nodes.Invoke;
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import org.graalvm.compiler.nodes.ParameterNode;
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import org.graalvm.compiler.nodes.StructuredGraph;
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import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
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import org.graalvm.compiler.nodes.ValueNode;
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import org.graalvm.compiler.phases.common.CanonicalizerPhase;
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import org.graalvm.compiler.phases.common.DeadCodeEliminationPhase;
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import org.graalvm.compiler.phases.common.inlining.InliningUtil;
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import org.graalvm.compiler.phases.graph.FixedNodeProbabilityCache;
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import org.graalvm.compiler.phases.tiers.HighTierContext;
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import jdk.vm.ci.meta.ResolvedJavaMethod;
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/**
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* <p>
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* Represents a feasible concrete target for inlining, whose graph has been copied already and thus
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* can be modified without affecting the original (usually cached) version.
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* </p>
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*
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* <p>
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* Instances of this class don't make sense in isolation but as part of an
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* {@link org.graalvm.compiler.phases.common.inlining.info.InlineInfo InlineInfo}.
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* </p>
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*
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* @see org.graalvm.compiler.phases.common.inlining.walker.InliningData#moveForward()
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* @see org.graalvm.compiler.phases.common.inlining.walker.CallsiteHolderExplorable
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*/
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public class InlineableGraph implements Inlineable {
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private final StructuredGraph graph;
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private FixedNodeProbabilityCache probabilites = new FixedNodeProbabilityCache();
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public InlineableGraph(final ResolvedJavaMethod method, final Invoke invoke, final HighTierContext context, CanonicalizerPhase canonicalizer) {
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StructuredGraph original = getOriginalGraph(method, context, canonicalizer, invoke.asNode().graph(), invoke.bci());
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// TODO copying the graph is only necessary if it is modified or if it contains any invokes
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this.graph = (StructuredGraph) original.copy(invoke.asNode().getDebug());
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specializeGraphToArguments(invoke, context, canonicalizer);
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}
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/**
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* This method looks up in a cache the graph for the argument, if not found bytecode is parsed.
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* The graph thus obtained is returned, ie the caller is responsible for cloning before
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* modification.
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*/
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private static StructuredGraph getOriginalGraph(final ResolvedJavaMethod method, final HighTierContext context, CanonicalizerPhase canonicalizer, StructuredGraph caller, int callerBci) {
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StructuredGraph result = InliningUtil.getIntrinsicGraph(context.getReplacements(), method, callerBci);
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if (result != null) {
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return result;
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}
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return parseBytecodes(method, context, canonicalizer, caller);
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}
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/**
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* @return true iff one or more parameters <code>newGraph</code> were specialized to account for
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* a constant argument, or an argument with a more specific stamp.
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*/
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@SuppressWarnings("try")
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private boolean specializeGraphToArguments(final Invoke invoke, final HighTierContext context, CanonicalizerPhase canonicalizer) {
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DebugContext debug = graph.getDebug();
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try (DebugContext.Scope s = debug.scope("InlineGraph", graph)) {
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ArrayList<Node> parameterUsages = replaceParamsWithMoreInformativeArguments(invoke, context);
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if (parameterUsages != null) {
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assert !parameterUsages.isEmpty() : "The caller didn't have more information about arguments after all";
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canonicalizer.applyIncremental(graph, context, parameterUsages);
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return true;
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} else {
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// TODO (chaeubl): if args are not more concrete, inlining should be avoided
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// in most cases or we could at least use the previous graph size + invoke
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// probability to check the inlining
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return false;
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}
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} catch (Throwable e) {
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throw debug.handle(e);
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}
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}
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private static boolean isArgMoreInformativeThanParam(ValueNode arg, ParameterNode param) {
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return arg.isConstant() || canStampBeImproved(arg, param);
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}
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private static boolean canStampBeImproved(ValueNode arg, ParameterNode param) {
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return improvedStamp(arg, param) != null;
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}
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private static Stamp improvedStamp(ValueNode arg, ParameterNode param) {
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Stamp joinedStamp = param.stamp().join(arg.stamp());
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if (joinedStamp == null || joinedStamp.equals(param.stamp())) {
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return null;
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}
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return joinedStamp;
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}
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/**
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* This method detects:
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* <ul>
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* <li>constants among the arguments to the <code>invoke</code></li>
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* <li>arguments with more precise type than that declared by the corresponding parameter</li>
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* </ul>
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*
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* <p>
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* The corresponding parameters are updated to reflect the above information. Before doing so,
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* their usages are added to <code>parameterUsages</code> for later incremental
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* canonicalization.
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* </p>
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*
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* @return null if no incremental canonicalization is need, a list of nodes for such
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* canonicalization otherwise.
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*/
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private ArrayList<Node> replaceParamsWithMoreInformativeArguments(final Invoke invoke, final HighTierContext context) {
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NodeInputList<ValueNode> args = invoke.callTarget().arguments();
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ArrayList<Node> parameterUsages = null;
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List<ParameterNode> params = graph.getNodes(ParameterNode.TYPE).snapshot();
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assert params.size() <= args.size();
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/*
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* param-nodes that aren't used (eg, as a result of canonicalization) don't occur in
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* `params`. Thus, in general, the sizes of `params` and `args` don't always match. Still,
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* it's always possible to pair a param-node with its corresponding arg-node using
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* param.index() as index into `args`.
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*/
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for (ParameterNode param : params) {
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if (param.usages().isNotEmpty()) {
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ValueNode arg = args.get(param.index());
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if (arg.isConstant()) {
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ConstantNode constant = (ConstantNode) arg;
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parameterUsages = trackParameterUsages(param, parameterUsages);
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// collect param usages before replacing the param
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param.replaceAtUsagesAndDelete(graph.unique(
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ConstantNode.forConstant(arg.stamp(), constant.getValue(), constant.getStableDimension(), constant.isDefaultStable(), context.getMetaAccess())));
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// param-node gone, leaving a gap in the sequence given by param.index()
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} else {
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Stamp impro = improvedStamp(arg, param);
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if (impro != null) {
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param.setStamp(impro);
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parameterUsages = trackParameterUsages(param, parameterUsages);
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} else {
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assert !isArgMoreInformativeThanParam(arg, param);
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}
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}
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}
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}
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assert (parameterUsages == null) || (!parameterUsages.isEmpty());
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return parameterUsages;
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}
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private static ArrayList<Node> trackParameterUsages(ParameterNode param, ArrayList<Node> parameterUsages) {
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ArrayList<Node> result = (parameterUsages == null) ? new ArrayList<>() : parameterUsages;
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param.usages().snapshotTo(result);
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return result;
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}
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/**
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* This method builds the IR nodes for the given <code>method</code> and canonicalizes them.
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* Provided profiling info is mature, the resulting graph is cached. The caller is responsible
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* for cloning before modification.
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* </p>
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*/
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@SuppressWarnings("try")
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private static StructuredGraph parseBytecodes(ResolvedJavaMethod method, HighTierContext context, CanonicalizerPhase canonicalizer, StructuredGraph caller) {
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DebugContext debug = caller.getDebug();
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StructuredGraph newGraph = new StructuredGraph.Builder(caller.getOptions(), debug, AllowAssumptions.ifNonNull(caller.getAssumptions())).method(method).build();
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try (DebugContext.Scope s = debug.scope("InlineGraph", newGraph)) {
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if (!caller.isUnsafeAccessTrackingEnabled()) {
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newGraph.disableUnsafeAccessTracking();
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}
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if (context.getGraphBuilderSuite() != null) {
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context.getGraphBuilderSuite().apply(newGraph, context);
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}
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assert newGraph.start().next() != null : "graph needs to be populated by the GraphBuilderSuite " + method + ", " + method.canBeInlined();
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new DeadCodeEliminationPhase(Optional).apply(newGraph);
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canonicalizer.apply(newGraph, context);
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return newGraph;
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} catch (Throwable e) {
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throw debug.handle(e);
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}
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}
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@Override
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public int getNodeCount() {
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return InliningUtil.getNodeCount(graph);
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}
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@Override
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public Iterable<Invoke> getInvokes() {
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return graph.getInvokes();
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}
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@Override
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public double getProbability(Invoke invoke) {
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return probabilites.applyAsDouble(invoke.asNode());
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}
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public StructuredGraph getGraph() {
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return graph;
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}
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}
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