/*
* 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.facebook.presto.sql.gen;
import com.facebook.presto.byteCode.ClassDefinition;
import com.facebook.presto.byteCode.ClassInfoLoader;
import com.facebook.presto.byteCode.DumpByteCodeVisitor;
import com.facebook.presto.byteCode.DynamicClassLoader;
import com.facebook.presto.byteCode.ParameterizedType;
import com.facebook.presto.byteCode.SmartClassWriter;
import com.google.common.collect.ImmutableList;
import com.google.common.io.Files;
import io.airlift.log.Logger;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.util.CheckClassAdapter;
import org.objectweb.asm.util.TraceClassVisitor;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.lang.invoke.MethodHandle;
import java.nio.charset.StandardCharsets;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
public final class CompilerUtils
{
private static final Logger log = Logger.get(CompilerUtils.class);
private static final boolean DUMP_BYTE_CODE_TREE = false;
private static final boolean DUMP_BYTE_CODE_RAW = false;
private static final boolean RUN_ASM_VERIFIER = false; // verifier doesn't work right now
private static final AtomicReference<String> DUMP_CLASS_FILES_TO = new AtomicReference<>();
private static final AtomicLong CLASS_ID = new AtomicLong();
private CompilerUtils()
{
}
public static ParameterizedType makeClassName(String baseName)
{
return ParameterizedType.typeFromJavaClassName("com.facebook.presto.$gen." + baseName + "_" + CLASS_ID.incrementAndGet());
}
public static <T> Class<? extends T> defineClass(ClassDefinition classDefinition, Class<T> superType, DynamicClassLoader classLoader)
{
Class<?> clazz = defineClasses(ImmutableList.of(classDefinition), classLoader).values().iterator().next();
return clazz.asSubclass(superType);
}
public static <T> Class<? extends T> defineClass(ClassDefinition classDefinition, Class<T> superType, Map<Long, MethodHandle> callSiteBindings, ClassLoader parentClassLoader)
{
Class<?> clazz = defineClass(classDefinition, superType, new DynamicClassLoader(parentClassLoader, callSiteBindings));
return clazz.asSubclass(superType);
}
private static Map<String, Class<?>> defineClasses(List<ClassDefinition> classDefinitions, DynamicClassLoader classLoader)
{
ClassInfoLoader classInfoLoader = ClassInfoLoader.createClassInfoLoader(classDefinitions, classLoader);
if (DUMP_BYTE_CODE_TREE) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
DumpByteCodeVisitor dumpByteCode = new DumpByteCodeVisitor(new PrintStream(out));
for (ClassDefinition classDefinition : classDefinitions) {
dumpByteCode.visitClass(classDefinition);
}
System.out.println(new String(out.toByteArray(), StandardCharsets.UTF_8));
}
Map<String, byte[]> byteCodes = new LinkedHashMap<>();
for (ClassDefinition classDefinition : classDefinitions) {
ClassWriter cw = new SmartClassWriter(classInfoLoader);
classDefinition.visit(cw);
byte[] byteCode = cw.toByteArray();
if (RUN_ASM_VERIFIER) {
ClassReader reader = new ClassReader(byteCode);
CheckClassAdapter.verify(reader, classLoader, true, new PrintWriter(System.out));
}
byteCodes.put(classDefinition.getType().getJavaClassName(), byteCode);
}
String dumpClassPath = DUMP_CLASS_FILES_TO.get();
if (dumpClassPath != null) {
for (Map.Entry<String, byte[]> entry : byteCodes.entrySet()) {
File file = new File(dumpClassPath, ParameterizedType.typeFromJavaClassName(entry.getKey()).getClassName() + ".class");
try {
log.debug("ClassFile: " + file.getAbsolutePath());
Files.createParentDirs(file);
Files.write(entry.getValue(), file);
}
catch (IOException e) {
log.error(e, "Failed to write generated class file to: %s" + file.getAbsolutePath());
}
}
}
if (DUMP_BYTE_CODE_RAW) {
for (byte[] byteCode : byteCodes.values()) {
ClassReader classReader = new ClassReader(byteCode);
classReader.accept(new TraceClassVisitor(new PrintWriter(System.err)), ClassReader.SKIP_FRAMES);
}
}
return classLoader.defineClasses(byteCodes);
}
}