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/*
* Copyright 2011 the original author or authors.
*
* 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 org.gradle.groovy.scripts.internal;
import groovy.lang.Script;
import org.codehaus.groovy.ast.ClassNode;
import org.gradle.api.Action;
import org.gradle.api.file.RelativePath;
import org.gradle.api.internal.initialization.ClassLoaderScope;
import org.gradle.cache.CacheRepository;
import org.gradle.cache.PersistentCache;
import org.gradle.groovy.scripts.ScriptSource;
import org.gradle.internal.Pair;
import org.gradle.internal.classanalysis.AsmConstants;
import org.gradle.internal.classpath.CachedClasspathTransformer;
import org.gradle.internal.classpath.ClassPath;
import org.gradle.internal.classpath.ClasspathEntryVisitor;
import org.gradle.internal.classpath.DefaultClassPath;
import org.gradle.internal.hash.ClassLoaderHierarchyHasher;
import org.gradle.internal.hash.HashCode;
import org.gradle.internal.hash.HashUtil;
import org.gradle.internal.hash.Hasher;
import org.gradle.internal.hash.Hashing;
import org.gradle.internal.hash.PrimitiveHasher;
import org.gradle.internal.logging.progress.ProgressLogger;
import org.gradle.internal.logging.progress.ProgressLoggerFactory;
import org.gradle.model.dsl.internal.transform.RuleVisitor;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import static org.gradle.internal.classpath.CachedClasspathTransformer.StandardTransform.BuildLogic;
/**
* A {@link ScriptClassCompiler} which compiles scripts to a cache directory, and loads them from there.
*/
public class FileCacheBackedScriptClassCompiler implements ScriptClassCompiler, Closeable {
private static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
private final ScriptCompilationHandler scriptCompilationHandler;
private final ProgressLoggerFactory progressLoggerFactory;
private final CacheRepository cacheRepository;
private final ClassLoaderHierarchyHasher classLoaderHierarchyHasher;
private final CachedClasspathTransformer classpathTransformer;
public FileCacheBackedScriptClassCompiler(CacheRepository cacheRepository, ScriptCompilationHandler scriptCompilationHandler,
ProgressLoggerFactory progressLoggerFactory, ClassLoaderHierarchyHasher classLoaderHierarchyHasher,
CachedClasspathTransformer classpathTransformer) {
this.cacheRepository = cacheRepository;
this.scriptCompilationHandler = scriptCompilationHandler;
this.progressLoggerFactory = progressLoggerFactory;
this.classLoaderHierarchyHasher = classLoaderHierarchyHasher;
this.classpathTransformer = classpathTransformer;
}
@Override
public CompiledScript compile(final ScriptSource source,
final ClassLoaderScope targetScope,
final CompileOperation operation,
final Class scriptBaseClass,
final Action verifier) {
assert source.getResource().isContentCached();
if (source.getResource().getHasEmptyContent()) {
return emptyCompiledScript(operation);
}
ClassLoader classLoader = targetScope.getExportClassLoader();
HashCode sourceHashCode = source.getResource().getContentHash();
final String dslId = operation.getId();
HashCode classLoaderHash = classLoaderHierarchyHasher.getClassLoaderHash(classLoader);
if (classLoaderHash == null) {
throw new IllegalArgumentException("Unknown classloader: " + classLoader);
}
final RemappingScriptSource remapped = new RemappingScriptSource(source);
PrimitiveHasher hasher = Hashing.newPrimitiveHasher();
hasher.putString(dslId);
hasher.putHash(sourceHashCode);
hasher.putHash(classLoaderHash);
String key = HashUtil.compactStringFor(hasher.hash().toByteArray());
// Caching involves 2 distinct caches, so that 2 scripts with the same (hash, classpath) do not get compiled twice
// 1. First, we look for a cache script which (path, hash) matches. This cache is invalidated when the compile classpath of the script changes
// 2. Then we look into the 2d cache for a "generic script" with the same hash, that will be remapped to the script class name
// Both caches can be closed directly after use because:
// For 1, if the script changes or its compile classpath changes, a different directory will be used
// For 2, if the script changes, a different cache is used. If the classpath changes, the cache is invalidated, but classes are remapped to 1. anyway so never directly used
final PersistentCache cache = cacheRepository.cache("scripts/" + key)
.withDisplayName(dslId + " generic class cache for " + source.getDisplayName())
.withInitializer(new ProgressReportingInitializer(
progressLoggerFactory,
new CompileToCrossBuildCacheAction(remapped, classLoader, operation, verifier, scriptBaseClass),
"Compiling " + source.getShortDisplayName()))
.open();
try {
File genericClassesDir = classesDir(cache, operation);
File metadataDir = metadataDir(cache);
ClassPath remappedClasses = remapClasses(genericClassesDir, remapped);
return scriptCompilationHandler.loadFromDir(source, sourceHashCode, targetScope, remappedClasses, metadataDir, operation, scriptBaseClass);
} finally {
cache.close();
}
}
private CompiledScript emptyCompiledScript(CompileOperation operation) {
return new EmptyCompiledScript<>(operation);
}
private ClassPath remapClasses(File genericClassesDir, RemappingScriptSource source) {
ScriptSource origin = source.getSource();
String className = origin.getClassName();
return classpathTransformer.transform(DefaultClassPath.of(genericClassesDir), BuildLogic, new CachedClasspathTransformer.Transform() {
@Override
public void applyConfigurationTo(Hasher hasher) {
hasher.putString(FileCacheBackedScriptClassCompiler.class.getSimpleName());
hasher.putInt(1); // transformation version
hasher.putString(className);
}
@Override
public Pair apply(ClasspathEntryVisitor.Entry entry, ClassVisitor visitor) throws IOException {
String renamed = entry.getPath().getLastName();
if (renamed.startsWith(RemappingScriptSource.MAPPED_SCRIPT)) {
renamed = className + renamed.substring(RemappingScriptSource.MAPPED_SCRIPT.length());
}
byte[] content = entry.getContent();
ClassReader cr = new ClassReader(content);
String originalClassName = cr.getClassName();
String contentHash = Hashing.hashBytes(content).toString();
BuildScriptRemapper remapper = new BuildScriptRemapper(visitor, origin, originalClassName, contentHash);
return Pair.of(entry.getPath().getParent().append(true, renamed), remapper);
}
});
}
@Override
public void close() {
}
private File classesDir(PersistentCache cache, CompileOperation operation) {
return new File(cache.getBaseDir(), operation.getId());
}
private File metadataDir(PersistentCache cache) {
return new File(cache.getBaseDir(), "metadata");
}
private class CompileToCrossBuildCacheAction implements Action {
private final Action verifier;
private final Class scriptBaseClass;
private final ClassLoader classLoader;
private final CompileOperation operation;
private final ScriptSource source;
public CompileToCrossBuildCacheAction(ScriptSource source, ClassLoader classLoader, CompileOperation operation,
Action verifier, Class scriptBaseClass) {
this.source = source;
this.classLoader = classLoader;
this.operation = operation;
this.verifier = verifier;
this.scriptBaseClass = scriptBaseClass;
}
@Override
public void execute(PersistentCache cache) {
File classesDir = classesDir(cache, operation);
File metadataDir = metadataDir(cache);
scriptCompilationHandler.compileToDir(source, classLoader, classesDir, metadataDir, operation, scriptBaseClass, verifier);
}
}
static class ProgressReportingInitializer implements Action {
private final ProgressLoggerFactory progressLoggerFactory;
private final Action delegate;
private final String shortDescription;
public ProgressReportingInitializer(ProgressLoggerFactory progressLoggerFactory,
Action delegate,
String shortDescription) {
this.progressLoggerFactory = progressLoggerFactory;
this.delegate = delegate;
this.shortDescription = shortDescription;
}
@Override
public void execute(PersistentCache cache) {
ProgressLogger op = progressLoggerFactory.newOperation(FileCacheBackedScriptClassCompiler.class).start(shortDescription, shortDescription);
try {
delegate.execute(cache);
} finally {
op.completed();
}
}
}
private static class EmptyCompiledScript implements CompiledScript {
private final M data;
public EmptyCompiledScript(CompileOperation operation) {
this.data = operation.getExtractedData();
}
@Override
public boolean getRunDoesSomething() {
return false;
}
@Override
public boolean getHasMethods() {
return false;
}
@Override
public void onReuse() {
// Ignore
}
@Override
public Class loadClass() {
throw new UnsupportedOperationException("Cannot load a script that does nothing.");
}
@Override
public M getData() {
return data;
}
}
private static class BuildScriptRemapper extends ClassVisitor implements Opcodes {
private static final String SCRIPT_ORIGIN = "org/gradle/internal/scripts/ScriptOrigin";
private final ScriptSource scriptSource;
private final String originalClassName;
private final String contentHash;
public BuildScriptRemapper(ClassVisitor cv, ScriptSource source, String originalClassName, String contentHash) {
super(AsmConstants.ASM_LEVEL, cv);
this.scriptSource = source;
this.originalClassName = originalClassName;
this.contentHash = contentHash;
}
@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
String owner = remap(name);
boolean shouldAddScriptOrigin = shouldAddScriptOrigin(access);
cv.visit(version, access, owner, remap(signature), remap(superName), remapAndAddInterfaces(interfaces, shouldAddScriptOrigin));
if (shouldAddScriptOrigin) {
addOriginalClassName(cv, owner, originalClassName);
addContentHash(cv, owner, contentHash);
}
}
private static boolean shouldAddScriptOrigin(int access) {
return ((access & ACC_INTERFACE) == 0) && ((access & ACC_ANNOTATION) == 0);
}
private static void addOriginalClassName(ClassVisitor cv, String owner, String originalClassName) {
cv.visitField(ACC_PRIVATE | ACC_STATIC | ACC_SYNTHETIC | ACC_FINAL, "__originalClassName", Type.getDescriptor(String.class), "", originalClassName);
MethodVisitor mv = cv.visitMethod(ACC_PUBLIC, "getOriginalClassName", Type.getMethodDescriptor(Type.getType(String.class)), null, null);
mv.visitCode();
mv.visitFieldInsn(GETSTATIC, owner, "__originalClassName", Type.getDescriptor(String.class));
mv.visitInsn(ARETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
private static void addContentHash(ClassVisitor cv, String owner, String contentHash) {
cv.visitField(ACC_PRIVATE | ACC_STATIC | ACC_SYNTHETIC | ACC_FINAL, "__signature", Type.getDescriptor(String.class), "", contentHash);
MethodVisitor mv = cv.visitMethod(ACC_PUBLIC, "getContentHash", Type.getMethodDescriptor(Type.getType(String.class)), null, null);
mv.visitCode();
mv.visitFieldInsn(GETSTATIC, owner, "__signature", Type.getDescriptor(String.class));
mv.visitInsn(ARETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
@Override
public void visitSource(String source, String debug) {
cv.visitSource(scriptSource.getFileName(), debug);
}
private String[] remapAndAddInterfaces(String[] interfaces, boolean shouldAddScriptOrigin) {
if (!shouldAddScriptOrigin) {
return remap(interfaces);
}
if (interfaces == null) {
return new String[]{SCRIPT_ORIGIN};
}
String[] remapped = new String[interfaces.length + 1];
for (int i = 0; i < interfaces.length; i++) {
remapped[i] = remap(interfaces[i]);
}
remapped[remapped.length - 1] = SCRIPT_ORIGIN;
return remapped;
}
private String[] remap(String[] names) {
if (names == null) {
return null;
}
String[] remapped = new String[names.length];
for (int i = 0; i < names.length; i++) {
remapped[i] = remap(names[i]);
}
return remapped;
}
private String remap(String name) {
if (name == null) {
return null;
}
if (RuleVisitor.SOURCE_URI_TOKEN.equals(name)) {
URI uri = scriptSource.getResource().getLocation().getURI();
return uri == null ? null : uri.toString();
}
if (RuleVisitor.SOURCE_DESC_TOKEN.equals(name)) {
return scriptSource.getDisplayName();
}
return name.replaceAll(RemappingScriptSource.MAPPED_SCRIPT, scriptSource.getClassName());
}
private Object remap(Object o) {
if (o instanceof Type) {
return Type.getType(remap(((Type) o).getDescriptor()));
}
if (o instanceof String) {
return remap((String) o);
}
return o;
}
private Object[] remap(int count, Object[] original) {
if (count == 0) {
return EMPTY_OBJECT_ARRAY;
}
Object[] remapped = new Object[count];
for (int idx = 0; idx < count; idx++) {
remapped[idx] = remap(original[idx]);
}
return remapped;
}
@Override
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
MethodVisitor mv = cv.visitMethod(access, name, remap(desc), remap(signature), remap(exceptions));
if (mv != null && (access & ACC_ABSTRACT) == 0) {
mv = new MethodRenamer(mv);
}
return mv;
}
@Override
public FieldVisitor visitField(int access, String name, String desc, String signature, Object value) {
return super.visitField(access, name, remap(desc), remap(signature), remap(value));
}
@Override
public void visitInnerClass(String name, String outerName, String innerName, int access) {
super.visitInnerClass(remap(name), remap(outerName), remap(innerName), access);
}
@Override
public void visitOuterClass(String owner, String name, String desc) {
super.visitOuterClass(remap(owner), remap(name), remap(desc));
}
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
return super.visitAnnotation(remap(desc), visible);
}
class MethodRenamer extends MethodVisitor {
public MethodRenamer(final MethodVisitor mv) {
super(AsmConstants.ASM_LEVEL, mv);
}
@Override
public void visitTypeInsn(int i, String name) {
mv.visitTypeInsn(i, remap(name));
}
@Override
public void visitFieldInsn(int opcode, String owner, String name, String desc) {
mv.visitFieldInsn(opcode, remap(owner), name, remap(desc));
}
@Override
public void visitMethodInsn(int opcode, String owner, String name, String desc, boolean intf) {
mv.visitMethodInsn(opcode, remap(owner), name, remap(desc), intf);
}
@Override
public void visitLdcInsn(Object cst) {
super.visitLdcInsn(remap(cst));
}
@Override
public void visitLocalVariable(String name, String desc, String signature, Label start, Label end, int index) {
super.visitLocalVariable(name, remap(desc), remap(signature), start, end, index);
}
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
return super.visitAnnotation(remap(desc), visible);
}
@Override
public void visitFrame(int type, int nLocal, Object[] local, int nStack, Object[] stack) {
super.visitFrame(type, nLocal, remap(nLocal, local), nStack, remap(nStack, stack));
}
}
}
}
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