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/*
* Copyright (C) 2018 The Android Open Source Project
*
* 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 "precise_hidden_api_finder.h"
#include "class_filter.h"
#include "dex/class_accessor-inl.h"
#include "dex/code_item_accessors-inl.h"
#include "dex/dex_instruction-inl.h"
#include "dex/dex_file.h"
#include "dex/method_reference.h"
#include "flow_analysis.h"
#include "hidden_api.h"
#include "resolver.h"
#include "veridex.h"
#include <iostream>
namespace art {
void PreciseHiddenApiFinder::RunInternal(
const std::vector<std::unique_ptr<VeridexResolver>>& resolvers,
const ClassFilter& class_filter,
const std::function<void(VeridexResolver*, const ClassAccessor::Method&)>& action) {
for (const std::unique_ptr<VeridexResolver>& resolver : resolvers) {
for (ClassAccessor accessor : resolver->GetDexFile().GetClasses()) {
if (class_filter.Matches(accessor.GetDescriptor())) {
for (const ClassAccessor::Method& method : accessor.GetMethods()) {
if (method.GetCodeItem() != nullptr) {
action(resolver.get(), method);
}
}
}
}
}
}
void PreciseHiddenApiFinder::AddUsesAt(const std::vector<ReflectAccessInfo>& accesses,
MethodReference ref) {
for (const ReflectAccessInfo& info : accesses) {
if (info.IsConcrete()) {
concrete_uses_[ref].push_back(info);
} else {
abstract_uses_[ref].push_back(info);
}
}
}
void PreciseHiddenApiFinder::Run(const std::vector<std::unique_ptr<VeridexResolver>>& resolvers,
const ClassFilter& class_filter) {
// Collect reflection uses.
RunInternal(resolvers,
class_filter,
[this] (VeridexResolver* resolver, const ClassAccessor::Method& method) {
FlowAnalysisCollector collector(resolver, method);
collector.Run();
AddUsesAt(collector.GetUses(), method.GetReference());
});
// For non-final reflection uses, do a limited fixed point calculation over the code to try
// substituting them with final reflection uses.
// We limit the number of times we iterate over the code as one run can be long.
static const int kMaximumIterations = 10;
uint32_t i = 0;
while (!abstract_uses_.empty() && (i++ < kMaximumIterations)) {
// Fetch and clear the worklist.
std::map<MethodReference, std::vector<ReflectAccessInfo>> current_uses
= std::move(abstract_uses_);
RunInternal(resolvers,
class_filter,
[this, current_uses] (VeridexResolver* resolver,
const ClassAccessor::Method& method) {
FlowAnalysisSubstitutor substitutor(resolver, method, current_uses);
substitutor.Run();
AddUsesAt(substitutor.GetUses(), method.GetReference());
});
}
}
void PreciseHiddenApiFinder::Dump(std::ostream& os, HiddenApiStats* stats) {
static const char* kPrefix = " ";
std::map<std::string, std::vector<MethodReference>> named_uses;
for (auto& it : concrete_uses_) {
MethodReference ref = it.first;
for (const ReflectAccessInfo& info : it.second) {
std::string cls(info.cls.ToString());
std::string name(info.name.ToString());
std::string full_name = cls + "->" + name;
named_uses[full_name].push_back(ref);
}
}
for (auto& it : named_uses) {
const std::string& full_name = it.first;
if (hidden_api_.GetSignatureSource(full_name) != SignatureSource::APP &&
hidden_api_.ShouldReport(full_name)) {
stats->reflection_count++;
hiddenapi::ApiList api_list = hidden_api_.GetApiList(full_name);
stats->api_counts[api_list.GetIntValue()]++;
os << "#" << ++stats->count << ": Reflection " << api_list << " " << full_name << " use(s):";
os << std::endl;
for (const MethodReference& ref : it.second) {
os << kPrefix << HiddenApi::GetApiMethodName(ref) << std::endl;
}
os << std::endl;
}
}
}
} // namespace art
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