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// Copyright 2017 The Bazel Authors. 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.
#ifndef SRC_TOOLS_SINGLEJAR_DESUGAR_CHECKING_H_
#define SRC_TOOLS_SINGLEJAR_DESUGAR_CHECKING_H_ 1
#include <functional>
#include <map>
#include <string>
#include <unordered_map>
#include <vector>
#include "src/tools/singlejar/combiners.h"
#include "src/tools/singlejar/transient_bytes.h"
#include "src/tools/singlejar/zip_headers.h"
// Combiner that checks META-INF/desugar_deps files (b/65645388) to ensure
// correct bytecode desugaring, specifically of default and static interface
// methods, across an entire binary. Two checks are performed:
// 1. Make sure that any dependency assumed by the desugaring process is in
// fact part of the binary. This protects against ill-advised uses of
// neverlink, where a library is only on the compile-time classpath but not
// the runtime classpath.
// 2. To paper over incomplete classpaths during desugaring (b/65211436), check
// that interfaces that couldn't be found don't declare or inherit default
// methods. Desugar emits extra metadata to avoid us having to open up and
// parse .class files for this purpose.
class Java8DesugarDepsChecker : public Combiner {
public:
Java8DesugarDepsChecker(std::function<bool (const std::string&)> known_member,
bool verbose)
: Java8DesugarDepsChecker(std::move(known_member), verbose, true) {}
~Java8DesugarDepsChecker() override {}
bool Merge(const CDH *cdh, const LH *lh) override;
void *OutputEntry(bool compress) override;
private:
Java8DesugarDepsChecker(std::function<bool (const std::string&)> known_member,
bool verbose, bool fail_on_error)
: known_member_(std::move(known_member)),
verbose_(verbose),
fail_on_error_(fail_on_error),
error_(false) {}
/// Computes and caches whether the given interface has default methods.
/// \param interface_name interface name as it would appear in bytecode, e.g.,
/// "java/lang/Runnable"
bool HasDefaultMethods(const std::string &interface_name);
const std::function<bool (const std::string&)> known_member_;
const bool verbose_;
const bool fail_on_error_; // For testing
std::unique_ptr<TransientBytes> buffer_;
std::unique_ptr<Inflater> inflater_;
/// Reverse mapping from needed dependencies to one of the users.
std::map<std::string, std::string> needed_deps_;
/// Reverse mapping from missing interfaces to one of the classes that missed
/// them.
std::map<std::string, std::string> missing_interfaces_;
std::unordered_map<std::string, std::vector<std::string> >
extended_interfaces_;
/// Cache of interfaces known to definitely define or inherit default methods
/// or definitely not define and not inherit default methods. Merge()
/// populates initial entries and HasDefaultMethods() adds to the cache as
/// needed.
std::unordered_map<std::string, bool> has_default_methods_;
bool error_;
friend class Java8DesugarDepsCheckerTest;
};
#endif // SRC_TOOLS_SINGLEJAR_DESUGAR_CHECKING_H_
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