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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.
#include "src/tools/singlejar/desugar_checking.h"
#include "src/tools/singlejar/diag.h"
#include "src/main/protobuf/desugar_deps.pb.h"
bool Java8DesugarDepsChecker::Merge(const CDH *cdh, const LH *lh) {
// Throw away anything previously read, no need to concatenate
buffer_.reset(new TransientBytes());
if (Z_NO_COMPRESSION == lh->compression_method()) {
buffer_->ReadEntryContents(lh);
} else if (Z_DEFLATED == lh->compression_method()) {
if (!inflater_.get()) {
inflater_.reset(new Inflater());
}
buffer_->DecompressEntryContents(cdh, lh, inflater_.get());
} else {
errx(2, "META-INF/desugar_deps is neither stored nor deflated");
}
// TODO(kmb): Wrap buffer_ as ZeroCopyInputStream to avoid copying out.
// Note we only copy one file at a time, so overhead should be modest.
uint32_t checksum;
const size_t data_size = buffer_->data_size();
uint8_t *buf = reinterpret_cast<uint8_t *>(malloc(data_size));
buffer_->CopyOut(reinterpret_cast<uint8_t *>(buf), &checksum);
buffer_.reset(); // release buffer eagerly
bazel::tools::desugar::DesugarDepsInfo deps_info;
google::protobuf::io::CodedInputStream content(buf, data_size);
if (!deps_info.ParseFromCodedStream(&content)) {
errx(2, "META-INF/desugar_deps: unable to parse");
}
if (!content.ConsumedEntireMessage()) {
errx(2, "META-INF/desugar_deps: unexpected trailing content");
}
free(buf);
for (const auto &assume_present : deps_info.assume_present()) {
// This means we need file named <target>.class in the output. Remember
// the first origin of this requirement for error messages, drop others.
needed_deps_.emplace(assume_present.target().binary_name() + ".class",
assume_present.origin().binary_name());
}
for (const auto &missing : deps_info.missing_interface()) {
// Remember the first origin of this requirement for error messages, drop
// subsequent ones.
missing_interfaces_.emplace(missing.target().binary_name(),
missing.origin().binary_name());
}
for (const auto &extends : deps_info.interface_with_supertypes()) {
// Remember interface hierarchy the first time we see this interface, drop
// subsequent ones for consistency with how singlejar will keep the first
// occurrence of the file defining the interface. We'll lazily derive
// whether missing_interfaces_ inherit default methods with this data later.
if (extends.extended_interface_size() > 0) {
std::vector<std::string> extended;
extended.reserve(extends.extended_interface_size());
for (const auto &itf : extends.extended_interface()) {
extended.push_back(itf.binary_name());
}
extended_interfaces_.emplace(extends.origin().binary_name(),
std::move(extended));
}
}
for (const auto &companion : deps_info.interface_with_companion()) {
// Only remember interfaces that definitely have default methods for now.
// For all other interfaces we'll transitively check extended interfaces
// in HasDefaultMethods.
if (companion.num_default_methods() > 0) {
has_default_methods_[companion.origin().binary_name()] = true;
}
}
return true;
}
void *Java8DesugarDepsChecker::OutputEntry(bool compress) {
if (verbose_) {
fprintf(stderr, "Needed deps: %lu\n", needed_deps_.size());
fprintf(stderr, "Interfaces to check: %lu\n", missing_interfaces_.size());
fprintf(stderr, "Sub-interfaces: %lu\n", extended_interfaces_.size());
fprintf(stderr, "Interfaces w/ default methods: %lu\n",
has_default_methods_.size());
}
for (auto needed : needed_deps_) {
if (verbose_) {
fprintf(stderr, "Looking for %s\n", needed.first.c_str());
}
if (!known_member_(needed.first)) {
if (fail_on_error_) {
errx(2, "%s referenced by %s but not found. Is the former defined in "
"a neverlink library?",
needed.first.c_str(), needed.second.c_str());
} else {
error_ = true;
}
}
}
for (auto missing : missing_interfaces_) {
if (verbose_) {
fprintf(stderr, "Checking %s\n", missing.first.c_str());
}
if (HasDefaultMethods(missing.first)) {
if (fail_on_error_) {
errx(2, "%s needed on the classpath for desugaring %s. Please add the "
"missing dependency to the target containing the latter.",
missing.first.c_str(), missing.second.c_str());
} else {
error_ = true;
}
}
}
// We don't want these files in the output, just check them for consistency
return nullptr;
}
bool Java8DesugarDepsChecker::HasDefaultMethods(
const std::string &interface_name) {
auto cached = has_default_methods_.find(interface_name);
if (cached != has_default_methods_.end()) {
return cached->second;
}
// Prime with false in case there's a cycle. We'll update with the true value
// (ignoring the cycle) below.
has_default_methods_.emplace(interface_name, false);
for (const std::string &extended : extended_interfaces_[interface_name]) {
if (HasDefaultMethods(extended)) {
has_default_methods_[interface_name] = true;
return true;
}
}
has_default_methods_[interface_name] = false;
return false;
}
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