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com.google.gwt.dev.Link Maven / Gradle / Ivy
/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.dev;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.linker.Artifact;
import com.google.gwt.core.ext.linker.ArtifactSet;
import com.google.gwt.core.ext.linker.EmittedArtifact;
import com.google.gwt.core.ext.linker.EmittedArtifact.Visibility;
import com.google.gwt.core.ext.linker.SelectionProperty;
import com.google.gwt.core.ext.linker.impl.BinaryOnlyArtifactWrapper;
import com.google.gwt.core.ext.linker.impl.JarEntryEmittedArtifact;
import com.google.gwt.core.ext.linker.impl.StandardCompilationResult;
import com.google.gwt.core.ext.linker.impl.StandardLinkerContext;
import com.google.gwt.dev.CompileTaskRunner.CompileTask;
import com.google.gwt.dev.cfg.BindingProperties;
import com.google.gwt.dev.cfg.BindingProperty;
import com.google.gwt.dev.cfg.ModuleDef;
import com.google.gwt.dev.cfg.ModuleDefLoader;
import com.google.gwt.dev.cfg.PropertyCombinations;
import com.google.gwt.dev.cfg.ResourceLoader;
import com.google.gwt.dev.cfg.ResourceLoaders;
import com.google.gwt.dev.jjs.PermutationResult;
import com.google.gwt.dev.jjs.impl.codesplitter.CodeSplitter;
import com.google.gwt.dev.resource.ResourceOracle;
import com.google.gwt.dev.util.NullOutputFileSet;
import com.google.gwt.dev.util.OutputFileSet;
import com.google.gwt.dev.util.OutputFileSetOnDirectory;
import com.google.gwt.dev.util.OutputFileSetOnJar;
import com.google.gwt.dev.util.PersistenceBackedObject;
import com.google.gwt.dev.util.Util;
import com.google.gwt.dev.util.arg.ArgHandlerDeployDir;
import com.google.gwt.dev.util.arg.ArgHandlerExtraDir;
import com.google.gwt.dev.util.arg.ArgHandlerSaveSourceOutput;
import com.google.gwt.dev.util.arg.ArgHandlerWarDir;
import com.google.gwt.dev.util.arg.OptionDeployDir;
import com.google.gwt.dev.util.arg.OptionExtraDir;
import com.google.gwt.dev.util.arg.OptionSaveSourceOutput;
import com.google.gwt.dev.util.arg.OptionWarDir;
import com.google.gwt.dev.util.log.speedtracer.CompilerEventType;
import com.google.gwt.dev.util.log.speedtracer.SpeedTracerLogger;
import com.google.gwt.dev.util.log.speedtracer.SpeedTracerLogger.Event;
import com.google.gwt.thirdparty.guava.common.collect.Sets;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
/**
* Performs the last phase of compilation, merging the compilation outputs.
*/
public class Link {
/**
* Options for Link.
*/
public interface LinkOptions extends OptionExtraDir,
OptionWarDir, OptionDeployDir, OptionSaveSourceOutput, CompileTaskOptions {
}
static class ArgProcessor extends CompileArgProcessor {
public ArgProcessor(LinkOptions options) {
super(options);
registerHandler(new ArgHandlerExtraDir(options));
registerHandler(new ArgHandlerWarDir(options));
registerHandler(new ArgHandlerDeployDir(options));
registerHandler(new ArgHandlerSaveSourceOutput(options));
}
@Override
protected String getName() {
return Link.class.getName();
}
}
/**
* Concrete class to implement link options.
*/
static class LinkOptionsImpl extends CompileTaskOptionsImpl implements
LinkOptions {
private File deployDir;
private File extraDir;
private File warDir;
private File debugSourceDir;
public LinkOptionsImpl() {
}
public LinkOptionsImpl(LinkOptions other) {
copyFrom(other);
}
public void copyFrom(LinkOptions other) {
super.copyFrom(other);
setDeployDir(other.getDeployDir());
setExtraDir(other.getExtraDir());
setSaveSourceOutput(other.getSaveSourceOutput());
setWarDir(other.getWarDir());
}
@Override
public File getSaveSourceOutput() {
return debugSourceDir;
}
@Override
public File getDeployDir() {
return (deployDir == null) ? new File(warDir, "WEB-INF/deploy")
: deployDir;
}
@Override
public File getExtraDir() {
return extraDir;
}
@Override
public File getWarDir() {
return warDir;
}
@Override
public void setSaveSourceOutput(File dest) {
this.debugSourceDir = dest;
}
@Override
public void setDeployDir(File dir) {
deployDir = dir;
}
@Override
public void setExtraDir(File extraDir) {
this.extraDir = extraDir;
}
@Override
public void setWarDir(File warDir) {
this.warDir = warDir;
}
}
public static void link(TreeLogger logger, ModuleDef module, ResourceOracle publicResourceOracle,
ArtifactSet generatedArtifacts, Permutation[] permutations,
List> resultFiles,
Set libraries, PrecompileTaskOptions precompileOptions,
LinkOptions linkOptions)
throws UnableToCompleteException, IOException {
StandardLinkerContext linkerContext =
new StandardLinkerContext(logger, module, publicResourceOracle,
precompileOptions.getOutput());
ArtifactSet artifacts = doSimulatedShardingLink(
logger, module, linkerContext, generatedArtifacts, permutations, resultFiles);
doProduceOutput(logger, artifacts, linkerContext, module, precompileOptions.shouldSaveSource(),
linkOptions);
}
/**
* This link operation is performed on a CompilePerms shard for one
* permutation. It sees the generated artifacts for one permutation compile,
* and it runs the per-permutation part of each shardable linker.
*/
public static void linkOnePermutationToJar(TreeLogger logger,
ModuleDef module, ResourceOracle publicResourceOracle, ArtifactSet generatedArtifacts,
PermutationResult permResult, File jarFile,
PrecompileTaskOptions precompileOptions) throws UnableToCompleteException {
try {
if (jarFile.exists()) {
boolean success = jarFile.delete();
if (!success) {
logger.log(TreeLogger.ERROR, "Linker output file " + jarFile.getName()
+ " already exists and can't be deleted.");
}
}
JarOutputStream jar = new JarOutputStream(new FileOutputStream(jarFile));
StandardLinkerContext linkerContext = new StandardLinkerContext(logger,
module, publicResourceOracle, precompileOptions.getOutput());
StandardCompilationResult compilation = new StandardCompilationResult(
permResult);
addSelectionPermutations(compilation, permResult.getPermutation(),
linkerContext);
ArtifactSet permArtifacts = new ArtifactSet(generatedArtifacts);
permArtifacts.addAll(permResult.getArtifacts());
permArtifacts.add(compilation);
ArtifactSet linkedArtifacts = linkerContext.invokeLinkForOnePermutation(
logger, compilation, permArtifacts);
// Write the data of emitted artifacts
for (EmittedArtifact art : linkedArtifacts.find(EmittedArtifact.class)) {
Visibility visibility = art.getVisibility();
String jarEntryPath = visibility.name() + "/";
if (visibility == Visibility.Public) {
jarEntryPath += art.getPartialPath();
} else {
jarEntryPath += prefixArtifactPath(art, linkerContext);
}
ZipEntry ze = new ZipEntry(jarEntryPath);
ze.setTime(OutputFileSetOnJar.normalizeTimestamps ? 0 : art.getLastModified());
jar.putNextEntry(ze);
art.writeTo(logger, jar);
jar.closeEntry();
}
// Serialize artifacts marked as Transferable
int numSerializedArtifacts = 0;
// The raw type Artifact is to work around a Java compiler bug:
// http://bugs.sun.com/view_bug.do?bug_id=6548436
for (Artifact art : linkedArtifacts) {
if (art.isTransferableFromShards() && !(art instanceof EmittedArtifact)) {
String jarEntryPath = "arts/" + numSerializedArtifacts++;
ZipEntry ze = new ZipEntry(jarEntryPath);
if (OutputFileSetOnJar.normalizeTimestamps) {
ze.setTime(0);
}
jar.putNextEntry(ze);
Util.writeObjectToStream(jar, art);
jar.closeEntry();
}
}
jar.close();
} catch (IOException e) {
logger.log(TreeLogger.ERROR, "Error linking", e);
throw new UnableToCompleteException();
}
}
public static void main(String[] args) {
boolean success = false;
Event linkEvent = SpeedTracerLogger.start(CompilerEventType.LINK);
/*
* NOTE: main always exits with a call to System.exit to terminate any
* non-daemon threads that were started in Generators. Typically, this is to
* shutdown AWT related threads, since the contract for their termination is
* still implementation-dependent.
*/
final LinkOptions options = new LinkOptionsImpl();
if (new ArgProcessor(options).processArgs(args)) {
CompileTask task = new CompileTask() {
@Override
public boolean run(TreeLogger logger) throws UnableToCompleteException {
return new Link(options).run(logger);
}
};
if (CompileTaskRunner.runWithAppropriateLogger(options, task)) {
success = true;
}
}
linkEvent.end();
System.exit(success ? 0 : 1);
}
/**
* In a parallel build, artifact sets are thinned down in transit between
* compilation and linking. All emitted artifacts are changed to binary
* emitted artifacts, and all other artifacts are dropped except @Transferable
* ones. This method simulates the thinning that happens in a parallel build.
*/
@SuppressWarnings("rawtypes")
public static ArtifactSet simulateTransferThinning(ArtifactSet artifacts,
StandardLinkerContext context) {
ArtifactSet thinnedArtifacts = new ArtifactSet();
// The raw type Artifact is to work around a compiler bug:
// http://bugs.sun.com/view_bug.do?bug_id=6548436
for (Artifact artifact : artifacts) {
if (artifact instanceof EmittedArtifact) {
EmittedArtifact emittedArtifact = (EmittedArtifact) artifact;
String path = getFullArtifactPath(emittedArtifact, context);
thinnedArtifacts.add(new BinaryOnlyArtifactWrapper(path,
emittedArtifact));
} else if (artifact.isTransferableFromShards()) {
thinnedArtifacts.add(artifact);
}
}
return thinnedArtifacts;
}
/**
* Add to a compilation result all of the selection permutations from its
* associated permutation.
*/
private static void addSelectionPermutations(
StandardCompilationResult compilation, Permutation permutation,
StandardLinkerContext linkerContext) {
for (BindingProperties properties : permutation.getProperties().getSoftProperties()) {
compilation.addSelectionPermutation(computeSelectionPermutation(linkerContext, properties));
compilation.addSoftPermutation(computeSoftPermutation(linkerContext, properties));
}
}
/**
* Choose an output file set for the given dirOrJar based on its
* name, whether it's null, and whether it already exists as a directory.
*/
static OutputFileSet chooseOutputFileSet(File dirOrJar,
String pathPrefix) throws IOException {
if (dirOrJar == null) {
return new NullOutputFileSet();
}
String name = dirOrJar.getName();
if (!dirOrJar.isDirectory() && (name.endsWith(".war")
|| name.endsWith(".jar") || name.endsWith(".zip"))) {
return new OutputFileSetOnJar(dirOrJar, pathPrefix);
} else {
Util.recursiveDelete(new File(dirOrJar, pathPrefix), true);
return new OutputFileSetOnDirectory(dirOrJar, pathPrefix);
}
}
/**
* Return a map giving the value of each non-trivial selection property.
*/
private static Map computeSelectionPermutation(
StandardLinkerContext linkerContext, BindingProperties properties) {
BindingProperty[] orderedProps = properties.getOrderedProps();
String[] orderedPropValues = properties.getOrderedPropValues();
Map unboundProperties = new HashMap();
for (int i = 0; i < orderedProps.length; i++) {
SelectionProperty key = linkerContext.getProperty(orderedProps[i].getName());
if (key.tryGetValue() != null) {
/*
* The view of the Permutation doesn't include properties with defined
* values.
*/
continue;
} else if (key.isDerived()) {
/*
* The property provider does not need to be invoked, because the value
* is determined entirely by other properties.
*/
continue;
}
unboundProperties.put(key, orderedPropValues[i]);
}
return unboundProperties;
}
private static Map computeSoftPermutation(
StandardLinkerContext linkerContext, BindingProperties properties) {
BindingProperty[] orderedProps = properties.getOrderedProps();
String[] orderedPropValues = properties.getOrderedPropValues();
Map softProperties = new HashMap();
for (int i = 0; i < orderedProps.length; i++) {
if (orderedProps[i].getCollapsedValuesSets().isEmpty()) {
continue;
}
SelectionProperty key = linkerContext.getProperty(orderedProps[i].getName());
softProperties.put(key, orderedPropValues[i]);
}
return softProperties;
}
/**
* Emit final output.
*/
private static void doProduceOutput(TreeLogger logger, ArtifactSet artifacts,
StandardLinkerContext linkerContext, ModuleDef module, boolean saveSources,
LinkOptions options) throws IOException, UnableToCompleteException {
// == create output filesets ==
String destPrefix = module.getName() + "/";
OutputFileSet outFileSet = chooseOutputFileSet(options.getWarDir(), destPrefix);
OutputFileSet extraFileSet = chooseOutputFileSet(options.getExtraDir(), destPrefix);
// allow -deploy and -extra to point to the same directory/jar
OutputFileSet deployFileSet;
if (options.getDeployDir().equals(options.getExtraDir())) {
deployFileSet = extraFileSet;
} else {
deployFileSet = chooseOutputFileSet(options.getDeployDir(), destPrefix);
}
// == write the output ==
linkerContext.produceOutput(logger, artifacts, Visibility.Public,
outFileSet);
linkerContext.produceOutput(logger, artifacts, Visibility.Deploy,
deployFileSet);
linkerContext.produceOutput(logger, artifacts, Visibility.Private,
extraFileSet);
if (saveSources) {
// Assume that all source code is available in the compiler's classpath.
// (This will have to be adjusted to work with Super Dev Mode.)
ResourceLoader loader = ResourceLoaders.forClassLoader(Thread.currentThread());
SourceSaver.save(logger, artifacts, loader, options, destPrefix, extraFileSet);
}
outFileSet.close();
extraFileSet.close();
if (deployFileSet != extraFileSet) {
deployFileSet.close();
}
logger.log(TreeLogger.INFO, "Link succeeded");
}
/**
* This link operation simulates sharded linking even though all generating
* and linking is happening on the same computer. It can tolerate
* non-shardable linkers.
*/
private static ArtifactSet doSimulatedShardingLink(TreeLogger logger, ModuleDef module,
StandardLinkerContext linkerContext, ArtifactSet generatedArtifacts, Permutation[] perms,
List> resultFiles)
throws UnableToCompleteException {
ArtifactSet combinedArtifacts = new ArtifactSet();
for (int i = 0; i < perms.length; ++i) {
ArtifactSet newArtifacts = finishPermutation(
logger, perms[i], resultFiles.get(i), linkerContext, generatedArtifacts);
combinedArtifacts.addAll(newArtifacts);
}
combinedArtifacts.addAll(linkerContext.getArtifactsForPublicResources(
logger, module));
ArtifactSet legacyLinkedArtifacts = linkerContext.invokeLegacyLinkers(
logger, combinedArtifacts);
ArtifactSet thinnedArtifacts = simulateTransferThinning(
legacyLinkedArtifacts, linkerContext);
return linkerContext.invokeFinalLink(logger, thinnedArtifacts);
}
/**
* Add a compilation to a linker context. Also runs the shardable part of all
* linkers that support sharding.
*
* @return the new artifacts generated by the shardable part of this link
* operation
*/
private static ArtifactSet finishPermutation(TreeLogger logger, Permutation perm,
PersistenceBackedObject resultFile, StandardLinkerContext linkerContext,
ArtifactSet generatedArtifacts)
throws UnableToCompleteException {
PermutationResult permResult = resultFile.newInstance(logger);
StandardCompilationResult compilation =
new StandardCompilationResult(permResult);
addSelectionPermutations(compilation, perm, linkerContext);
logScriptSize(logger, perm.getId(), compilation);
ArtifactSet permArtifacts = new ArtifactSet(generatedArtifacts);
permArtifacts.addAll(permResult.getArtifacts());
permArtifacts.add(compilation);
permArtifacts.freeze();
return linkerContext.invokeLinkForOnePermutation(logger, compilation,
permArtifacts);
}
private static String getFullArtifactPath(EmittedArtifact emittedArtifact,
StandardLinkerContext context) {
String path = emittedArtifact.getPartialPath();
if (emittedArtifact.getVisibility() != Visibility.Public) {
path = prefixArtifactPath(emittedArtifact, context);
}
return path;
}
/**
* Logs the total script size for this permutation, as calculated by
* CodeSplitter2#totalScriptSize(int[]).
*/
private static void logScriptSize(TreeLogger logger, int permId,
StandardCompilationResult compilation) {
if (!logger.isLoggable(TreeLogger.TRACE)) {
return;
}
String[] javaScript = compilation.getJavaScript();
int[] jsLengths = new int[javaScript.length];
for (int i = 0; i < javaScript.length; i++) {
jsLengths[i] = javaScript[i].length();
}
// TODO(acleung): This is broken for CodeSplitter2.
int totalSize = CodeSplitter.computeTotalSize(jsLengths);
if (logger.isLoggable(TreeLogger.TRACE)) {
logger.log(TreeLogger.TRACE, "Permutation " + permId + " (strong name "
+ compilation.getStrongName() + ") has an initial download size of "
+ javaScript[0].length() + " and total script size of " + totalSize);
}
}
/**
* Prefix an artifact's partial path with the linker name and make sure it is
* a relative pathname.
*
* @param art
* @param linkerContext
* @return prefixed path
*/
private static String prefixArtifactPath(EmittedArtifact art,
StandardLinkerContext linkerContext) {
String pathWithLinkerName = linkerContext.getExtraPathForLinker(
art.getLinker(), art.getPartialPath());
if (pathWithLinkerName.startsWith("/")) {
// This happens if the linker has no extra path
pathWithLinkerName = pathWithLinkerName.substring(1);
}
return pathWithLinkerName;
}
private static ArtifactSet scanCompilePermResults(TreeLogger logger,
List resultFiles) throws IOException, UnableToCompleteException {
final ArtifactSet artifacts = new ArtifactSet();
for (File resultFile : resultFiles) {
JarFile jarFile = null;
try {
jarFile = new JarFile(resultFile);
} catch (ZipException ze) {
logger.log(TreeLogger.ERROR, "Error opening " + resultFile
+ " as jar file.", ze);
throw new UnableToCompleteException();
}
Enumeration entries = jarFile.entries();
while (entries.hasMoreElements()) {
JarEntry entry = entries.nextElement();
if (entry.isDirectory()) {
continue;
}
String path;
Artifact artForEntry = null;
String entryName = entry.getName();
if (entryName.startsWith("arts/")) {
try {
artForEntry = Util.readStreamAsObject(new BufferedInputStream(
jarFile.getInputStream(entry)), Artifact.class);
assert artForEntry.isTransferableFromShards();
} catch (ClassNotFoundException e) {
logger.log(TreeLogger.ERROR,
"Failed trying to deserialize an artifact", e);
throw new UnableToCompleteException();
}
} else {
int slash = entryName.indexOf('/');
if (slash >= 0) {
try {
Visibility visibility = Visibility.valueOf(entryName.substring(0,
slash));
path = entryName.substring(slash + 1);
JarEntryEmittedArtifact jarArtifact = new JarEntryEmittedArtifact(
path, resultFile, entry);
jarArtifact.setVisibility(visibility);
artForEntry = jarArtifact;
} catch (IllegalArgumentException e) {
// silently ignore paths with invalid visibilities
continue;
}
}
}
artifacts.add(artForEntry);
}
jarFile.close();
}
return artifacts;
}
private final LinkOptionsImpl options;
private final CompilerContext.Builder compilerContextBuilder = new CompilerContext.Builder();
private CompilerContext compilerContext;
public Link(LinkOptions options) {
this.options = new LinkOptionsImpl(options);
compilerContext =
compilerContextBuilder.options(new PrecompileTaskOptionsImpl(options)).build();
}
public boolean run(TreeLogger logger) throws UnableToCompleteException {
loop_modules : for (String moduleName : options.getModuleNames()) {
ModuleDef module = ModuleDefLoader.loadFromClassPath(logger, moduleName);
compilerContext = compilerContextBuilder.module(module).build();
ResourceOracle publicResourceOracle = compilerContext.getPublicResourceOracle();
File compilerWorkDir = options.getCompilerWorkDir(moduleName);
// Look for the compilerOptions file output from running AnalyzeModule
PrecompileTaskOptions precompileOptions = AnalyzeModule.readAnalyzeModuleOptionsFile(
logger, compilerWorkDir);
PrecompilationResult precompileResults = null;
if (precompileOptions == null) {
// Check for the output from Precompile where precompiling has
// been delegated to shards.
File precompilationFile = new File(compilerWorkDir,
Precompile.PRECOMPILE_FILENAME);
precompileResults = CompilePerms.readPrecompilationFile(logger,
precompilationFile);
if (precompileResults == null) {
return false;
}
if (precompileResults instanceof PrecompileTaskOptions) {
precompileOptions = (PrecompileTaskOptions) precompileResults;
}
}
if (precompileOptions != null) {
/**
* Precompiling happened on the shards.
*/
if (!doLinkFinal(
logger, compilerWorkDir, module, publicResourceOracle, precompileOptions)) {
return false;
}
continue loop_modules;
} else {
/**
* Precompiling happened on the start node.
*/
Precompilation precomp = (Precompilation) precompileResults;
Permutation[] perms = precomp.getPermutations();
List> resultFiles =
CompilePerms.makeResultFiles(compilerWorkDir, perms, compilerContext.getOptions());
// Check that all files are present
for (PersistenceBackedObject file : resultFiles) {
if (!file.exists()) {
logger.log(TreeLogger.ERROR,
"File not found '" + file.getPath() + "'; please compile all permutations");
return false;
}
}
TreeLogger branch = logger.branch(TreeLogger.INFO, "Linking module "
+ module.getName());
try {
link(branch, module, publicResourceOracle, precomp.getGeneratedArtifacts(), perms,
resultFiles, Sets. newHashSet(),
precomp.getUnifiedAst().getOptions(), options);
} catch (IOException e) {
logger.log(TreeLogger.ERROR,
"Unexpected exception while producing output", e);
throw new UnableToCompleteException();
}
}
}
return true;
}
/**
* Do a final link, assuming the precompiles were done on the CompilePerms
* shards. Returns true if successful.
*/
private boolean doLinkFinal(TreeLogger logger, File compilerWorkDir, ModuleDef module,
ResourceOracle publicResourceOracle, PrecompileTaskOptions precompileOptions)
throws UnableToCompleteException {
int numPermutations = new PropertyCombinations(module.getProperties(),
module.getActiveLinkerNames()).collapseProperties().size();
List resultFiles = new ArrayList(numPermutations);
for (int i = 0; i < numPermutations; ++i) {
File f = CompilePerms.makePermFilename(compilerWorkDir, i);
if (!f.exists()) {
logger.log(TreeLogger.ERROR, "File not found '" + f.getAbsolutePath()
+ "'; please compile all permutations");
return false;
}
resultFiles.add(f);
}
TreeLogger branch = logger.branch(TreeLogger.INFO, "Linking module "
+ module.getName());
StandardLinkerContext linkerContext = new StandardLinkerContext(branch,
module, publicResourceOracle, precompileOptions.getOutput());
try {
ArtifactSet artifacts = scanCompilePermResults(logger, resultFiles);
artifacts.addAll(linkerContext.getArtifactsForPublicResources(logger,
module));
artifacts = linkerContext.invokeFinalLink(logger, artifacts);
doProduceOutput(logger, artifacts, linkerContext, module,
precompileOptions.shouldSaveSource(), options);
} catch (IOException e) {
logger.log(TreeLogger.ERROR, "Exception during final linking", e);
throw new UnableToCompleteException();
}
return true;
}
}
