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/*
* Copyright (c) 2013, 2017, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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 com.oracle.svm.hosted.code;
import org.graalvm.compiler.api.replacements.SnippetReflectionProvider;
import org.graalvm.compiler.bytecode.BytecodeProvider;
import org.graalvm.compiler.core.common.type.AbstractObjectStamp;
import org.graalvm.compiler.core.common.type.ObjectStamp;
import org.graalvm.compiler.java.BytecodeParser;
import org.graalvm.compiler.nodes.PiNode.PlaceholderStamp;
import org.graalvm.compiler.options.OptionValues;
import org.graalvm.compiler.phases.util.Providers;
import com.oracle.graal.pointsto.meta.AnalysisUniverse;
import com.oracle.graal.pointsto.meta.HostedProviders;
import com.oracle.svm.core.graal.meta.SubstrateReplacements;
import com.oracle.svm.core.util.VMError;
import com.oracle.svm.hosted.meta.HostedMethod;
import com.oracle.svm.hosted.meta.HostedUniverse;
import jdk.vm.ci.code.TargetDescription;
import jdk.vm.ci.meta.JavaField;
import jdk.vm.ci.meta.JavaMethod;
import jdk.vm.ci.meta.JavaType;
import jdk.vm.ci.meta.ResolvedJavaMethod;
import jdk.vm.ci.meta.ResolvedJavaType;
/**
* Snippets are parsed before the static analysis using {@link SubstrateReplacements}. This ensures
* that snippets do not use analysis-specific nodes - they are parsed using the same
* {@link BytecodeParser} subclass also used for parsing the snippets we use for runtime
* compilation. The parsing uses the {@link AnalysisUniverse}.
*
* We cannot parse snippets again before compilation with the {@link HostedUniverse}: the static
* analysis does not see the individual methods that are inlined into snippets, only the final graph
* for snippets after aggressive inlining and constant folding. Therefore, many methods used inside
* snippets are not marked as invoked.
*
* Therefore, we re-use the snippets parsed before static analysis also for compilation. We need to
* transplant these snippets from the {@link AnalysisUniverse} to the {@link HostedUniverse}, i.e.,
* we need to change out all metadata objects (types, methods, fields, ...). This is easy because
* the snippets are encoded anyway, so we have a single Object[] array with all objects referenced
* from the snippet graphs. The object replacement is done in {@link #replaceAnalysisObjects}.
*/
public class HostedReplacements extends SubstrateReplacements {
private final HostedUniverse hUniverse;
private final SubstrateReplacements aReplacements;
public HostedReplacements(HostedUniverse hUniverse, Providers providers, SnippetReflectionProvider snippetReflection, TargetDescription target, HostedProviders anaylysisProviders,
BytecodeProvider bytecodeProvider, OptionValues options) {
super(options, providers, snippetReflection, bytecodeProvider, target, null);
this.hUniverse = hUniverse;
this.aReplacements = (SubstrateReplacements) anaylysisProviders.getReplacements();
}
@Override
public void registerSnippet(ResolvedJavaMethod method, ResolvedJavaMethod original, Object receiver, boolean trackNodeSourcePosition) {
/* We must have the snippet already available in the analysis replacements. */
assert aReplacements.getSnippet(((HostedMethod) method).wrapped, null, null, trackNodeSourcePosition, null) != null;
}
@Override
public void encodeSnippets() {
/* Copy over all snippets from the analysis replacements, changing out metadata objects. */
super.copyFrom(aReplacements, this::replaceAnalysisObjects);
}
private Object replaceAnalysisObjects(Object obj) {
if (obj == null) {
return obj;
}
/* First check for the obvious metadata objects: types, methods, fields. */
if (obj instanceof JavaType) {
return hUniverse.lookup((JavaType) obj);
} else if (obj instanceof JavaMethod) {
return hUniverse.lookup((JavaMethod) obj);
} else if (obj instanceof JavaField) {
return hUniverse.lookup((JavaField) obj);
} else if (obj.getClass() == ObjectStamp.class) {
if (((ObjectStamp) obj).type() == null) {
/* No actual type referenced, so we can keep the original object. */
return obj;
} else {
/*
* ObjectStamp references a type indirectly, so we need to provide a new stamp with
* a modified type.
*/
ObjectStamp stamp = (ObjectStamp) obj;
return new ObjectStamp((ResolvedJavaType) replaceAnalysisObjects(stamp.type()), stamp.isExactType(), stamp.nonNull(), stamp.alwaysNull());
}
} else if (obj.getClass() == PlaceholderStamp.class) {
assert ((PlaceholderStamp) obj).type() == null : "PlaceholderStamp never references a type";
return obj;
} else if (obj instanceof AbstractObjectStamp) {
throw VMError.shouldNotReachHere("missing replacement of a subclass of AbstractObjectStamp: " + obj.getClass().getTypeName());
} else {
/* Check that we do not have a class or package name that relates to the analysis. */
assert !obj.getClass().getName().toLowerCase().contains("analysis");
assert !obj.getClass().getName().toLowerCase().contains("pointsto");
return obj;
}
}
}