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/*
* Copyright 2018 Google Inc. All Rights Reserved.
*
* 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.turbine.binder;
import static com.google.common.base.Ascii.toUpperCase;
import static com.google.common.base.StandardSystemProperty.JAVA_HOME;
import static java.util.Objects.requireNonNull;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.collect.ImmutableMap;
import com.google.common.primitives.Ints;
import com.google.turbine.binder.bound.ModuleInfo;
import com.google.turbine.binder.bytecode.BytecodeBinder;
import com.google.turbine.binder.bytecode.BytecodeBoundClass;
import com.google.turbine.binder.env.Env;
import com.google.turbine.binder.env.SimpleEnv;
import com.google.turbine.binder.lookup.SimpleTopLevelIndex;
import com.google.turbine.binder.lookup.TopLevelIndex;
import com.google.turbine.binder.sym.ClassSymbol;
import com.google.turbine.binder.sym.ModuleSymbol;
import com.google.turbine.zip.Zip;
import java.io.IOException;
import java.lang.reflect.Method;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;
import org.checkerframework.checker.nullness.qual.Nullable;
/** Constructs a platform {@link ClassPath} from the current JDK's ct.sym file. */
public final class CtSymClassBinder {
@Nullable
public static ClassPath bind(String version) throws IOException {
String javaHome = JAVA_HOME.value();
requireNonNull(javaHome, "attempted to use --release, but JAVA_HOME is not set");
Path ctSym = Paths.get(javaHome).resolve("lib/ct.sym");
if (!Files.exists(ctSym)) {
throw new IllegalStateException("lib/ct.sym does not exist in " + javaHome);
}
Map<ClassSymbol, BytecodeBoundClass> map = new HashMap<>();
Map<ModuleSymbol, ModuleInfo> modules = new HashMap<>();
Env<ClassSymbol, BytecodeBoundClass> benv =
new Env<ClassSymbol, BytecodeBoundClass>() {
@Override
public BytecodeBoundClass get(ClassSymbol sym) {
return map.get(sym);
}
};
// ct.sym contains directories whose names are the concatentation of a list of target versions
// formatted as a single character 0-9 or A-Z (e.g. 789A) and which contain interface class
// files with a .sig extension.
String releaseString = formatReleaseVersion(version);
for (Zip.Entry ze : new Zip.ZipIterable(ctSym)) {
String name = ze.name();
if (!name.endsWith(".sig")) {
continue;
}
int idx = name.indexOf('/');
if (idx == -1) {
continue;
}
// check if the directory matches the desired release
if (!ze.name().substring(0, idx).contains(releaseString)) {
continue;
}
if (isAtLeastJDK12()) {
// JDK >= 12 includes the module name as a prefix
idx = name.indexOf('/', idx + 1);
}
if (name.substring(name.lastIndexOf('/') + 1).equals("module-info.sig")) {
ModuleInfo moduleInfo = BytecodeBinder.bindModuleInfo(name, toByteArrayOrDie(ze));
modules.put(new ModuleSymbol(moduleInfo.name()), moduleInfo);
continue;
}
ClassSymbol sym = new ClassSymbol(name.substring(idx + 1, name.length() - ".sig".length()));
map.putIfAbsent(
sym, new BytecodeBoundClass(sym, toByteArrayOrDie(ze), benv, ctSym + "!" + ze.name()));
}
if (map.isEmpty()) {
// we didn't find any classes for the desired release
return null;
}
SimpleEnv<ClassSymbol, BytecodeBoundClass> env = new SimpleEnv<>(ImmutableMap.copyOf(map));
Env<ModuleSymbol, ModuleInfo> moduleEnv = new SimpleEnv<>(ImmutableMap.copyOf(modules));
TopLevelIndex index = SimpleTopLevelIndex.of(env.asMap().keySet());
return new ClassPath() {
@Override
public Env<ClassSymbol, BytecodeBoundClass> env() {
return env;
}
@Override
public Env<ModuleSymbol, ModuleInfo> moduleEnv() {
return moduleEnv;
}
@Override
public TopLevelIndex index() {
return index;
}
@Override
public Supplier<byte[]> resource(String input) {
return null;
}
};
}
private static Supplier<byte[]> toByteArrayOrDie(Zip.Entry ze) {
return Suppliers.memoize(
new Supplier<byte[]>() {
@Override
public byte[] get() {
return ze.data();
}
});
}
@VisibleForTesting
static String formatReleaseVersion(String version) {
Integer n = Ints.tryParse(version);
if (n == null || n <= 4 || n >= 36) {
throw new IllegalArgumentException("invalid release version: " + version);
}
return toUpperCase(Integer.toString(n, 36));
}
private static boolean isAtLeastJDK12() {
int major;
try {
Method versionMethod = Runtime.class.getMethod("version");
Object version = versionMethod.invoke(null);
major = (int) version.getClass().getMethod("major").invoke(version);
} catch (ReflectiveOperationException e) {
// `Runtime.version()` was added in JDK 9
return false;
}
return major >= 12;
}
private CtSymClassBinder() {}
}
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