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SubstrateVM image builder components
/*
* Copyright (c) 2018, 2018, 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.c;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.BiFunction;
import java.util.stream.IntStream;
import org.graalvm.compiler.api.replacements.SnippetReflectionProvider;
import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderContext;
import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugin;
import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugin.Receiver;
import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugins;
import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugins.Registration;
import org.graalvm.compiler.phases.util.Providers;
import org.graalvm.nativeimage.ImageSingletons;
import com.oracle.svm.core.annotate.AutomaticFeature;
import com.oracle.svm.core.c.CGlobalData;
import com.oracle.svm.core.c.CGlobalDataImpl;
import com.oracle.svm.core.config.ConfigurationValues;
import com.oracle.svm.core.graal.GraalFeature;
import com.oracle.svm.core.graal.code.CGlobalDataInfo;
import com.oracle.svm.core.graal.nodes.CGlobalDataLoadAddressNode;
import com.oracle.svm.core.meta.SubstrateObjectConstant;
import com.oracle.svm.core.util.VMError;
import com.oracle.svm.hosted.image.RelocatableBuffer;
import jdk.vm.ci.meta.ResolvedJavaMethod;
@AutomaticFeature
public class CGlobalDataFeature implements GraalFeature {
public static CGlobalDataFeature singleton() {
return ImageSingletons.lookup(CGlobalDataFeature.class);
}
private Map, CGlobalDataInfo> map = new ConcurrentHashMap<>();
private int totalSize = -1;
private boolean isLayouted() {
return totalSize != -1;
}
@Override
public void duringSetup(DuringSetupAccess access) {
access.registerObjectReplacer(this::replaceObject);
}
@Override
public void afterHeapLayout(AfterHeapLayoutAccess access) {
layout();
}
@Override
public void registerInvocationPlugins(Providers providers, SnippetReflectionProvider snippetReflection, InvocationPlugins invocationPlugins, boolean analysis, boolean hosted) {
Registration r = new Registration(invocationPlugins, CGlobalData.class);
r.register1("get", Receiver.class, new InvocationPlugin() {
@Override
public boolean apply(GraphBuilderContext b, ResolvedJavaMethod targetMethod, Receiver receiver) {
VMError.guarantee(receiver.get().isConstant(), "Accessed CGlobalData is not a compile-time constant: " + b.getMethod().asStackTraceElement(b.bci()));
CGlobalDataImpl data = (CGlobalDataImpl) SubstrateObjectConstant.asObject(receiver.get().asConstant());
CGlobalDataInfo info = CGlobalDataFeature.this.map.get(data);
b.addPush(targetMethod.getSignature().getReturnKind(), new CGlobalDataLoadAddressNode(info));
return true;
}
});
}
public CGlobalDataInfo getCGlobalDataInfo(CGlobalDataImpl data) {
return map.get(data);
}
public CGlobalDataInfo registerAsAccessed(CGlobalData obj) {
CGlobalDataImpl data = (CGlobalDataImpl) obj;
assert !isLayouted() || map.containsKey(data) : "CGlobalData instance must have been discovered/registered before or during analysis";
return map.computeIfAbsent((CGlobalDataImpl) obj, o -> new CGlobalDataInfo(data));
}
private Object replaceObject(Object obj) {
if (obj instanceof CGlobalDataImpl) {
registerAsAccessed((CGlobalData) obj);
}
return obj;
}
private void layout() {
assert !isLayouted() : "Already layouted";
final int wordSize = ConfigurationValues.getTarget().wordSize;
int offset = 0;
for (Entry, CGlobalDataInfo> entry : map.entrySet()) {
CGlobalDataImpl data = entry.getKey();
CGlobalDataInfo info = entry.getValue();
int size;
byte[] bytes = null;
if (data.bytesSupplier != null) {
bytes = data.bytesSupplier.get();
size = bytes.length;
} else {
if (data.sizeSupplier != null) {
size = data.sizeSupplier.getAsInt();
} else {
assert data.symbolName != null : "CGlobalData without bytes, size, or referenced symbol";
/*
* A symbol reference: we support only instruction-pointer-relative addressing
* with 32-bit immediates, which might not be sufficient for the target symbol's
* address. Therefore, reserve space for a word with the symbol's true address.
*/
size = wordSize;
}
}
info.assign(offset, bytes);
offset += size;
offset = (offset + (wordSize - 1)) & ~(wordSize - 1); // align
}
totalSize = offset;
assert isLayouted();
}
public int getSize() {
assert isLayouted() : "Not layouted yet";
return totalSize;
}
public void writeData(RelocatableBuffer buffer, BiFunction createSymbol) {
assert isLayouted() : "Not layouted yet";
int start = buffer.getPosition();
assert IntStream.range(0, totalSize).allMatch(i -> buffer.getByte(i) == 0) : "Buffer must be zero-initialized";
for (CGlobalDataInfo info : map.values()) {
byte[] bytes = info.getBytes();
if (bytes != null) {
buffer.setPosition(start + info.getOffset());
buffer.putBytes(bytes, 0, bytes.length);
}
CGlobalDataImpl data = info.getData();
if (data.symbolName != null && !info.isSymbolReference()) {
createSymbol.apply(info.getOffset(), data.symbolName);
}
}
}
}