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SubstrateVM image builder components
/*
* Copyright (c) 2014, 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.c;
import static com.oracle.svm.core.util.VMError.shouldNotReachHere;
import static java.nio.file.FileVisitResult.CONTINUE;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.List;
import org.graalvm.compiler.options.Option;
import com.oracle.svm.core.option.HostedOptionKey;
import com.oracle.svm.core.option.SubstrateOptionsParser;
import com.oracle.svm.core.util.UserError;
import com.oracle.svm.hosted.c.info.NativeCodeInfo;
import com.oracle.svm.hosted.c.query.QueryResultParser;
/**
* Cache of pre-computed information for the {@link CAnnotationProcessor}. The cache is helpful to
* cut substantially the time to build of an svm image, when many CAnnotation are being used. This
* is the case, namely for Walnut, when the compilation time to generate the information for the C
* processor is by far the dominant cost.
*
* For simplicity, the cache cannot be updated: it can be re-created from scratch, or used. The two
* options are mutually exclusive, and the re-creation of the cache erase all previously cached
* information. responsibility for the accuracy of the cached content is up to the end user.
*
* A CAP cache is just a directory with a file for each {@link NativeCodeInfo}, where the file is
* pretty much the output of the "query" program generated by the CAnnotationProcessor.
*
*/
public final class CAnnotationProcessorCache {
private static final String FILE_EXTENSION = ".cap";
public static class Options {
@Option(help = "Indicate the C Annotation Processor to use previously cached native information when generating C Type information.")//
public static final HostedOptionKey UseCAPCache = new HostedOptionKey<>(false);
@Option(help = "Create a C Annotation Processor Cache. Will erase any previous cache at that same location.")//
public static final HostedOptionKey NewCAPCache = new HostedOptionKey<>(false);
@Option(help = "Directory where information generated by the CAnnotation Processor are cached.")//
public static final HostedOptionKey CAPCacheDir = new HostedOptionKey<>("");
@Option(help = "Exit image generation after C Annotation Processor Cache creation.")//
public static final HostedOptionKey ExitAfterCAPCache = new HostedOptionKey<>(false);
}
private File cache;
public CAnnotationProcessorCache() {
if ((Options.UseCAPCache.getValue() || Options.NewCAPCache.getValue())) {
if (Options.CAPCacheDir.getValue() == null || Options.CAPCacheDir.getValue().isEmpty()) {
throw UserError.abort("Path to C Annotation Processor Cache must be specified using " +
SubstrateOptionsParser.commandArgument(Options.CAPCacheDir, "") + " when the option " +
SubstrateOptionsParser.commandArgument(Options.UseCAPCache, "+") + " or " +
SubstrateOptionsParser.commandArgument(Options.NewCAPCache, "+") + " is used.");
}
Path cachePath = FileSystems.getDefault().getPath(Options.CAPCacheDir.getValue()).toAbsolutePath();
cache = cachePath.toFile();
if (!cache.exists()) {
try {
cache = Files.createDirectories(cachePath).toFile();
} catch (IOException e) {
throw UserError.abort("Could not create C Annotation Processor Cache directory: " + e.getMessage());
}
} else if (!cache.isDirectory()) {
throw UserError.abort("Path to C Annotation Processor Cache is not a directory");
} else if (Options.NewCAPCache.getValue()) {
clearCache();
}
}
}
private static String toPath(NativeCodeInfo nativeCodeInfo) {
return nativeCodeInfo.getName().replaceAll("\\W", "_").concat(FILE_EXTENSION);
}
public void get(NativeLibraries nativeLibs, NativeCodeInfo nativeCodeInfo) {
File file = new File(cache, toPath(nativeCodeInfo));
try (FileInputStream fis = new FileInputStream(file)) {
QueryResultParser.parse(nativeLibs, nativeCodeInfo, fis);
} catch (IOException e) {
throw UserError.abort("Could not load CAPCache file. " +
"Ensure that options " + Options.UseCAPCache.getName() + " and " + Options.NewCAPCache + " are used on the same version of your application. " +
"Raw error: " + e.getMessage());
}
}
public void put(NativeCodeInfo nativeCodeInfo, List lines) {
if (!Options.NewCAPCache.getValue()) {
return;
}
File cachedItem = new File(cache, toPath(nativeCodeInfo));
try (FileWriter writer = new FileWriter(cachedItem, true)) {
for (String line : lines) {
writer.write(line);
writer.write(Character.LINE_SEPARATOR);
}
return;
} catch (IOException e) {
throw shouldNotReachHere("Invalid CAnnotation Processor Cache item:" + cachedItem.toString());
}
}
private void clearCache() {
try {
final Path cachePath = cache.toPath();
Files.walkFileTree(cachePath, new SimpleFileVisitor() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
assert file.toString().endsWith(FILE_EXTENSION);
Files.delete(file);
return CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
if (!dir.equals(cachePath)) {
Files.delete(dir);
}
return CONTINUE;
}
});
} catch (IOException eio) {
throw shouldNotReachHere(eio);
}
}
}