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/*
* Copyright 2017 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.deps;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableList.Builder;
import com.google.common.collect.ImmutableMap;
import com.google.turbine.binder.Binder.BindingResult;
import com.google.turbine.binder.ClassPath;
import com.google.turbine.binder.bound.TypeBoundClass;
import com.google.turbine.binder.bytecode.BytecodeBoundClass;
import com.google.turbine.binder.env.CompoundEnv;
import com.google.turbine.binder.env.Env;
import com.google.turbine.binder.env.SimpleEnv;
import com.google.turbine.binder.sym.ClassSymbol;
import com.google.turbine.bytecode.ClassFile;
import com.google.turbine.bytecode.ClassFile.FieldInfo;
import com.google.turbine.bytecode.ClassFile.InnerClass;
import com.google.turbine.bytecode.ClassWriter;
import com.google.turbine.model.TurbineFlag;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* Collects the minimal compile-time API for symbols in the supertype closure of compiled classes.
* This allows header compilations to be performed against a classpath containing only direct
* dependencies and no transitive dependencies.
*/
public class Transitive {
public static ImmutableMap<String, byte[]> collectDeps(
ClassPath bootClassPath, BindingResult bound) {
ImmutableMap.Builder<String, byte[]> transitive = ImmutableMap.builder();
for (ClassSymbol sym : superClosure(bound)) {
BytecodeBoundClass info = bound.classPathEnv().get(sym);
if (info == null) {
// the symbol wasn't loaded from the classpath
continue;
}
if (bootClassPath.env().get(sym) != null) {
// don't export symbols loaded from the bootclasspath
continue;
}
transitive.put(sym.binaryName(), ClassWriter.writeClass(trimClass(info.classFile())));
}
return transitive.build();
}
/**
* Removes information from repackaged classes that will not be needed by upstream compilations.
*/
public static ClassFile trimClass(ClassFile cf) {
// drop non-constant fields
Builder<FieldInfo> fields = ImmutableList.builder();
for (FieldInfo f : cf.fields()) {
if (f.value() != null) {
fields.add(f);
}
}
// Remove InnerClass attributes that are unnecessary after pruning the types they refer to.
// To do this for javac, we would have to scan all remaining signatures and preserve attributes
// for reachable inner classes, but turbine only needs the attributes for the immediate
// children or parent of the current class.
Builder<InnerClass> innerClasses = ImmutableList.builder();
for (InnerClass i : cf.innerClasses()) {
if (i.innerClass().equals(cf.name()) || i.outerClass().equals(cf.name())) {
innerClasses.add(i);
}
}
return new ClassFile(
cf.access(),
cf.name(),
cf.signature(),
cf.superName(),
cf.interfaces(),
// drop methods, except for annotations where we need to resolve key/value information
(cf.access() & TurbineFlag.ACC_ANNOTATION) == TurbineFlag.ACC_ANNOTATION
? cf.methods()
: ImmutableList.of(),
fields.build(),
// unnecessary annotations are dropped during class reading, the only remaining ones are
// well-known @interface meta-annotations (e.g. @Retention, etc.)
cf.annotations(),
innerClasses.build(),
cf.typeAnnotations(),
/* module= */ null);
}
private static Set<ClassSymbol> superClosure(BindingResult bound) {
Env<ClassSymbol, TypeBoundClass> env =
CompoundEnv.<ClassSymbol, TypeBoundClass>of(new SimpleEnv<>(bound.units()))
.append(bound.classPathEnv());
Set<ClassSymbol> closure = new LinkedHashSet<>();
for (ClassSymbol sym : bound.units().keySet()) {
addSuperTypes(closure, env, sym);
}
Set<ClassSymbol> directChildren = new LinkedHashSet<>();
for (ClassSymbol sym : closure) {
TypeBoundClass info = env.get(sym);
if (info != null) {
directChildren.addAll(info.children().values());
}
}
closure.addAll(directChildren);
return closure;
}
private static void addSuperTypes(
Set<ClassSymbol> closure, Env<ClassSymbol, TypeBoundClass> env, ClassSymbol sym) {
if (!closure.add(sym)) {
return;
}
TypeBoundClass info = env.get(sym);
if (info == null) {
return;
}
if (info.superclass() != null) {
addSuperTypes(closure, env, info.superclass());
}
for (ClassSymbol i : info.interfaces()) {
addSuperTypes(closure, env, i);
}
}
}
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