772 lines
32 KiB
C++
772 lines
32 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "class_loader_context.h"
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#include <stdlib.h>
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#include "android-base/file.h"
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#include "art_field-inl.h"
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#include "base/dchecked_vector.h"
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#include "base/stl_util.h"
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#include "class_linker.h"
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#include "class_loader_utils.h"
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#include "dex_file.h"
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#include "handle_scope-inl.h"
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#include "jni_internal.h"
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#include "oat_file_assistant.h"
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#include "obj_ptr-inl.h"
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#include "runtime.h"
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#include "scoped_thread_state_change-inl.h"
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#include "thread.h"
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#include "well_known_classes.h"
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namespace art {
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static constexpr char kPathClassLoaderString[] = "PCL";
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static constexpr char kDelegateLastClassLoaderString[] = "DLC";
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static constexpr char kClassLoaderOpeningMark = '[';
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static constexpr char kClassLoaderClosingMark = ']';
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static constexpr char kClassLoaderSeparator = ';';
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static constexpr char kClasspathSeparator = ':';
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static constexpr char kDexFileChecksumSeparator = '*';
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ClassLoaderContext::ClassLoaderContext()
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: special_shared_library_(false),
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dex_files_open_attempted_(false),
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dex_files_open_result_(false),
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owns_the_dex_files_(true) {}
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ClassLoaderContext::ClassLoaderContext(bool owns_the_dex_files)
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: special_shared_library_(false),
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dex_files_open_attempted_(true),
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dex_files_open_result_(true),
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owns_the_dex_files_(owns_the_dex_files) {}
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ClassLoaderContext::~ClassLoaderContext() {
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if (!owns_the_dex_files_) {
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// If the context does not own the dex/oat files release the unique pointers to
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// make sure we do not de-allocate them.
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for (ClassLoaderInfo& info : class_loader_chain_) {
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for (std::unique_ptr<OatFile>& oat_file : info.opened_oat_files) {
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oat_file.release();
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}
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for (std::unique_ptr<const DexFile>& dex_file : info.opened_dex_files) {
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dex_file.release();
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}
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}
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}
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}
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std::unique_ptr<ClassLoaderContext> ClassLoaderContext::Default() {
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return Create("");
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}
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std::unique_ptr<ClassLoaderContext> ClassLoaderContext::Create(const std::string& spec) {
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std::unique_ptr<ClassLoaderContext> result(new ClassLoaderContext());
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if (result->Parse(spec)) {
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return result;
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} else {
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return nullptr;
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}
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}
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// The expected format is: "ClassLoaderType1[ClasspathElem1*Checksum1:ClasspathElem2*Checksum2...]".
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// The checksum part of the format is expected only if parse_cheksums is true.
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bool ClassLoaderContext::ParseClassLoaderSpec(const std::string& class_loader_spec,
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ClassLoaderType class_loader_type,
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bool parse_checksums) {
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const char* class_loader_type_str = GetClassLoaderTypeName(class_loader_type);
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size_t type_str_size = strlen(class_loader_type_str);
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CHECK_EQ(0, class_loader_spec.compare(0, type_str_size, class_loader_type_str));
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// Check the opening and closing markers.
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if (class_loader_spec[type_str_size] != kClassLoaderOpeningMark) {
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return false;
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}
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if (class_loader_spec[class_loader_spec.length() - 1] != kClassLoaderClosingMark) {
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return false;
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}
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// At this point we know the format is ok; continue and extract the classpath.
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// Note that class loaders with an empty class path are allowed.
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std::string classpath = class_loader_spec.substr(type_str_size + 1,
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class_loader_spec.length() - type_str_size - 2);
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class_loader_chain_.push_back(ClassLoaderInfo(class_loader_type));
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if (!parse_checksums) {
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Split(classpath, kClasspathSeparator, &class_loader_chain_.back().classpath);
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} else {
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std::vector<std::string> classpath_elements;
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Split(classpath, kClasspathSeparator, &classpath_elements);
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for (const std::string& element : classpath_elements) {
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std::vector<std::string> dex_file_with_checksum;
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Split(element, kDexFileChecksumSeparator, &dex_file_with_checksum);
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if (dex_file_with_checksum.size() != 2) {
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return false;
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}
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uint32_t checksum = 0;
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if (!ParseInt(dex_file_with_checksum[1].c_str(), &checksum)) {
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return false;
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}
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class_loader_chain_.back().classpath.push_back(dex_file_with_checksum[0]);
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class_loader_chain_.back().checksums.push_back(checksum);
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}
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}
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return true;
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}
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// Extracts the class loader type from the given spec.
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// Return ClassLoaderContext::kInvalidClassLoader if the class loader type is not
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// recognized.
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ClassLoaderContext::ClassLoaderType
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ClassLoaderContext::ExtractClassLoaderType(const std::string& class_loader_spec) {
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const ClassLoaderType kValidTypes[] = {kPathClassLoader, kDelegateLastClassLoader};
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for (const ClassLoaderType& type : kValidTypes) {
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const char* type_str = GetClassLoaderTypeName(type);
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if (class_loader_spec.compare(0, strlen(type_str), type_str) == 0) {
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return type;
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}
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}
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return kInvalidClassLoader;
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}
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// The format: ClassLoaderType1[ClasspathElem1:ClasspathElem2...];ClassLoaderType2[...]...
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// ClassLoaderType is either "PCL" (PathClassLoader) or "DLC" (DelegateLastClassLoader).
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// ClasspathElem is the path of dex/jar/apk file.
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bool ClassLoaderContext::Parse(const std::string& spec, bool parse_checksums) {
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if (spec.empty()) {
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// By default we load the dex files in a PathClassLoader.
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// So an empty spec is equivalent to an empty PathClassLoader (this happens when running
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// tests)
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class_loader_chain_.push_back(ClassLoaderInfo(kPathClassLoader));
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return true;
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}
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// Stop early if we detect the special shared library, which may be passed as the classpath
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// for dex2oat when we want to skip the shared libraries check.
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if (spec == OatFile::kSpecialSharedLibrary) {
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LOG(INFO) << "The ClassLoaderContext is a special shared library.";
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special_shared_library_ = true;
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return true;
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}
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std::vector<std::string> class_loaders;
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Split(spec, kClassLoaderSeparator, &class_loaders);
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for (const std::string& class_loader : class_loaders) {
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ClassLoaderType type = ExtractClassLoaderType(class_loader);
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if (type == kInvalidClassLoader) {
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LOG(ERROR) << "Invalid class loader type: " << class_loader;
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return false;
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}
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if (!ParseClassLoaderSpec(class_loader, type, parse_checksums)) {
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LOG(ERROR) << "Invalid class loader spec: " << class_loader;
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return false;
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}
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}
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return true;
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}
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// Opens requested class path files and appends them to opened_dex_files. If the dex files have
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// been stripped, this opens them from their oat files (which get added to opened_oat_files).
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bool ClassLoaderContext::OpenDexFiles(InstructionSet isa, const std::string& classpath_dir) {
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if (dex_files_open_attempted_) {
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// Do not attempt to re-open the files if we already tried.
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return dex_files_open_result_;
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}
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dex_files_open_attempted_ = true;
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// Assume we can open all dex files. If not, we will set this to false as we go.
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dex_files_open_result_ = true;
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if (special_shared_library_) {
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// Nothing to open if the context is a special shared library.
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return true;
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}
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// Note that we try to open all dex files even if some fail.
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// We may get resource-only apks which we cannot load.
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// TODO(calin): Refine the dex opening interface to be able to tell if an archive contains
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// no dex files. So that we can distinguish the real failures...
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for (ClassLoaderInfo& info : class_loader_chain_) {
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size_t opened_dex_files_index = info.opened_dex_files.size();
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for (const std::string& cp_elem : info.classpath) {
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// If path is relative, append it to the provided base directory.
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std::string raw_location = cp_elem;
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if (raw_location[0] != '/') {
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raw_location = classpath_dir + '/' + raw_location;
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}
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std::string location; // the real location of the class path element.
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if (!android::base::Realpath(raw_location, &location)) {
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// If we can't get the realpath of the location there might be something wrong with the
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// classpath (maybe the file was deleted).
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// Do not continue in this case and return false.
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PLOG(ERROR) << "Could not get the realpath of dex location " << raw_location;
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return false;
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}
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std::string error_msg;
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// When opening the dex files from the context we expect their checksum to match their
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// contents. So pass true to verify_checksum.
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if (!DexFile::Open(location.c_str(),
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location.c_str(),
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/*verify_checksum*/ true,
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&error_msg,
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&info.opened_dex_files)) {
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// If we fail to open the dex file because it's been stripped, try to open the dex file
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// from its corresponding oat file.
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// This could happen when we need to recompile a pre-build whose dex code has been stripped.
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// (for example, if the pre-build is only quicken and we want to re-compile it
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// speed-profile).
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// TODO(calin): Use the vdex directly instead of going through the oat file.
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OatFileAssistant oat_file_assistant(location.c_str(), isa, false);
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std::unique_ptr<OatFile> oat_file(oat_file_assistant.GetBestOatFile());
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std::vector<std::unique_ptr<const DexFile>> oat_dex_files;
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if (oat_file != nullptr &&
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OatFileAssistant::LoadDexFiles(*oat_file, location, &oat_dex_files)) {
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info.opened_oat_files.push_back(std::move(oat_file));
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info.opened_dex_files.insert(info.opened_dex_files.end(),
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std::make_move_iterator(oat_dex_files.begin()),
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std::make_move_iterator(oat_dex_files.end()));
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} else {
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LOG(WARNING) << "Could not open dex files from location: " << location;
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dex_files_open_result_ = false;
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}
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}
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}
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// We finished opening the dex files from the classpath.
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// Now update the classpath and the checksum with the locations of the dex files.
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//
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// We do this because initially the classpath contains the paths of the dex files; and
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// some of them might be multi-dexes. So in order to have a consistent view we replace all the
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// file paths with the actual dex locations being loaded.
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// This will allow the context to VerifyClassLoaderContextMatch which expects or multidex
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// location in the class paths.
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// Note that this will also remove the paths that could not be opened.
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info.classpath.clear();
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info.checksums.clear();
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for (size_t k = opened_dex_files_index; k < info.opened_dex_files.size(); k++) {
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std::unique_ptr<const DexFile>& dex = info.opened_dex_files[k];
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info.classpath.push_back(dex->GetLocation());
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info.checksums.push_back(dex->GetLocationChecksum());
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}
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}
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return dex_files_open_result_;
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}
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bool ClassLoaderContext::RemoveLocationsFromClassPaths(
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const dchecked_vector<std::string>& locations) {
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CHECK(!dex_files_open_attempted_)
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<< "RemoveLocationsFromClasspaths cannot be call after OpenDexFiles";
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std::set<std::string> canonical_locations;
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for (const std::string& location : locations) {
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canonical_locations.insert(DexFile::GetDexCanonicalLocation(location.c_str()));
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}
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bool removed_locations = false;
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for (ClassLoaderInfo& info : class_loader_chain_) {
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size_t initial_size = info.classpath.size();
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auto kept_it = std::remove_if(
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info.classpath.begin(),
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info.classpath.end(),
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[canonical_locations](const std::string& location) {
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return ContainsElement(canonical_locations,
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DexFile::GetDexCanonicalLocation(location.c_str()));
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});
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info.classpath.erase(kept_it, info.classpath.end());
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if (initial_size != info.classpath.size()) {
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removed_locations = true;
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}
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}
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return removed_locations;
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}
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std::string ClassLoaderContext::EncodeContextForDex2oat(const std::string& base_dir) const {
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return EncodeContext(base_dir, /*for_dex2oat*/ true);
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}
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std::string ClassLoaderContext::EncodeContextForOatFile(const std::string& base_dir) const {
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return EncodeContext(base_dir, /*for_dex2oat*/ false);
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}
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std::string ClassLoaderContext::EncodeContext(const std::string& base_dir,
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bool for_dex2oat) const {
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CheckDexFilesOpened("EncodeContextForOatFile");
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if (special_shared_library_) {
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return OatFile::kSpecialSharedLibrary;
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}
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std::ostringstream out;
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if (class_loader_chain_.empty()) {
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// We can get in this situation if the context was created with a class path containing the
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// source dex files which were later removed (happens during run-tests).
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out << GetClassLoaderTypeName(kPathClassLoader)
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<< kClassLoaderOpeningMark
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<< kClassLoaderClosingMark;
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return out.str();
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}
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for (size_t i = 0; i < class_loader_chain_.size(); i++) {
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const ClassLoaderInfo& info = class_loader_chain_[i];
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if (i > 0) {
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out << kClassLoaderSeparator;
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}
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out << GetClassLoaderTypeName(info.type);
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out << kClassLoaderOpeningMark;
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std::set<std::string> seen_locations;
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for (size_t k = 0; k < info.opened_dex_files.size(); k++) {
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const std::unique_ptr<const DexFile>& dex_file = info.opened_dex_files[k];
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if (for_dex2oat) {
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// dex2oat only needs the base location. It cannot accept multidex locations.
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// So ensure we only add each file once.
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bool new_insert = seen_locations.insert(dex_file->GetBaseLocation()).second;
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if (!new_insert) {
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continue;
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}
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}
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const std::string& location = dex_file->GetLocation();
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if (k > 0) {
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out << kClasspathSeparator;
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}
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// Find paths that were relative and convert them back from absolute.
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if (!base_dir.empty() && location.substr(0, base_dir.length()) == base_dir) {
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out << location.substr(base_dir.length() + 1).c_str();
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} else {
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out << dex_file->GetLocation().c_str();
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}
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// dex2oat does not need the checksums.
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if (!for_dex2oat) {
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out << kDexFileChecksumSeparator;
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out << dex_file->GetLocationChecksum();
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}
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}
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out << kClassLoaderClosingMark;
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}
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return out.str();
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}
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jobject ClassLoaderContext::CreateClassLoader(
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const std::vector<const DexFile*>& compilation_sources) const {
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CheckDexFilesOpened("CreateClassLoader");
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Thread* self = Thread::Current();
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ScopedObjectAccess soa(self);
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ClassLinker* const class_linker = Runtime::Current()->GetClassLinker();
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if (class_loader_chain_.empty()) {
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return class_linker->CreatePathClassLoader(self, compilation_sources);
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}
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// Create the class loaders starting from the top most parent (the one on the last position
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// in the chain) but omit the first class loader which will contain the compilation_sources and
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// needs special handling.
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jobject current_parent = nullptr; // the starting parent is the BootClassLoader.
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for (size_t i = class_loader_chain_.size() - 1; i > 0; i--) {
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std::vector<const DexFile*> class_path_files = MakeNonOwningPointerVector(
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class_loader_chain_[i].opened_dex_files);
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current_parent = class_linker->CreateWellKnownClassLoader(
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self,
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class_path_files,
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GetClassLoaderClass(class_loader_chain_[i].type),
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current_parent);
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}
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// We set up all the parents. Move on to create the first class loader.
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// Its classpath comes first, followed by compilation sources. This ensures that whenever
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// we need to resolve classes from it the classpath elements come first.
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std::vector<const DexFile*> first_class_loader_classpath = MakeNonOwningPointerVector(
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class_loader_chain_[0].opened_dex_files);
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first_class_loader_classpath.insert(first_class_loader_classpath.end(),
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compilation_sources.begin(),
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compilation_sources.end());
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return class_linker->CreateWellKnownClassLoader(
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self,
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first_class_loader_classpath,
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GetClassLoaderClass(class_loader_chain_[0].type),
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current_parent);
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}
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std::vector<const DexFile*> ClassLoaderContext::FlattenOpenedDexFiles() const {
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CheckDexFilesOpened("FlattenOpenedDexFiles");
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std::vector<const DexFile*> result;
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for (const ClassLoaderInfo& info : class_loader_chain_) {
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for (const std::unique_ptr<const DexFile>& dex_file : info.opened_dex_files) {
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result.push_back(dex_file.get());
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}
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}
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return result;
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}
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const char* ClassLoaderContext::GetClassLoaderTypeName(ClassLoaderType type) {
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switch (type) {
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case kPathClassLoader: return kPathClassLoaderString;
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case kDelegateLastClassLoader: return kDelegateLastClassLoaderString;
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default:
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LOG(FATAL) << "Invalid class loader type " << type;
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UNREACHABLE();
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}
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}
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void ClassLoaderContext::CheckDexFilesOpened(const std::string& calling_method) const {
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CHECK(dex_files_open_attempted_)
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<< "Dex files were not successfully opened before the call to " << calling_method
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<< "attempt=" << dex_files_open_attempted_ << ", result=" << dex_files_open_result_;
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}
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// Collects the dex files from the give Java dex_file object. Only the dex files with
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// at least 1 class are collected. If a null java_dex_file is passed this method does nothing.
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static bool CollectDexFilesFromJavaDexFile(ObjPtr<mirror::Object> java_dex_file,
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ArtField* const cookie_field,
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std::vector<const DexFile*>* out_dex_files)
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REQUIRES_SHARED(Locks::mutator_lock_) {
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if (java_dex_file == nullptr) {
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return true;
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}
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// On the Java side, the dex files are stored in the cookie field.
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mirror::LongArray* long_array = cookie_field->GetObject(java_dex_file)->AsLongArray();
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if (long_array == nullptr) {
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// This should never happen so log a warning.
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LOG(ERROR) << "Unexpected null cookie";
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return false;
|
|
}
|
|
int32_t long_array_size = long_array->GetLength();
|
|
// Index 0 from the long array stores the oat file. The dex files start at index 1.
|
|
for (int32_t j = 1; j < long_array_size; ++j) {
|
|
const DexFile* cp_dex_file = reinterpret_cast<const DexFile*>(static_cast<uintptr_t>(
|
|
long_array->GetWithoutChecks(j)));
|
|
if (cp_dex_file != nullptr && cp_dex_file->NumClassDefs() > 0) {
|
|
// TODO(calin): It's unclear why the dex files with no classes are skipped here and when
|
|
// cp_dex_file can be null.
|
|
out_dex_files->push_back(cp_dex_file);
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Collects all the dex files loaded by the given class loader.
|
|
// Returns true for success or false if an unexpected state is discovered (e.g. a null dex cookie,
|
|
// a null list of dex elements or a null dex element).
|
|
static bool CollectDexFilesFromSupportedClassLoader(ScopedObjectAccessAlreadyRunnable& soa,
|
|
Handle<mirror::ClassLoader> class_loader,
|
|
std::vector<const DexFile*>* out_dex_files)
|
|
REQUIRES_SHARED(Locks::mutator_lock_) {
|
|
CHECK(IsPathOrDexClassLoader(soa, class_loader) || IsDelegateLastClassLoader(soa, class_loader));
|
|
|
|
// All supported class loaders inherit from BaseDexClassLoader.
|
|
// We need to get the DexPathList and loop through it.
|
|
ArtField* const cookie_field =
|
|
jni::DecodeArtField(WellKnownClasses::dalvik_system_DexFile_cookie);
|
|
ArtField* const dex_file_field =
|
|
jni::DecodeArtField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile);
|
|
ObjPtr<mirror::Object> dex_path_list =
|
|
jni::DecodeArtField(WellKnownClasses::dalvik_system_BaseDexClassLoader_pathList)->
|
|
GetObject(class_loader.Get());
|
|
CHECK(cookie_field != nullptr);
|
|
CHECK(dex_file_field != nullptr);
|
|
if (dex_path_list == nullptr) {
|
|
// This may be null if the current class loader is under construction and it does not
|
|
// have its fields setup yet.
|
|
return true;
|
|
}
|
|
// DexPathList has an array dexElements of Elements[] which each contain a dex file.
|
|
ObjPtr<mirror::Object> dex_elements_obj =
|
|
jni::DecodeArtField(WellKnownClasses::dalvik_system_DexPathList_dexElements)->
|
|
GetObject(dex_path_list);
|
|
// Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look
|
|
// at the mCookie which is a DexFile vector.
|
|
if (dex_elements_obj == nullptr) {
|
|
// TODO(calin): It's unclear if we should just assert here. For now be prepared for the worse
|
|
// and assume we have no elements.
|
|
return true;
|
|
} else {
|
|
StackHandleScope<1> hs(soa.Self());
|
|
Handle<mirror::ObjectArray<mirror::Object>> dex_elements(
|
|
hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()));
|
|
for (int32_t i = 0; i < dex_elements->GetLength(); ++i) {
|
|
mirror::Object* element = dex_elements->GetWithoutChecks(i);
|
|
if (element == nullptr) {
|
|
// Should never happen, log an error and break.
|
|
// TODO(calin): It's unclear if we should just assert here.
|
|
// This code was propagated to oat_file_manager from the class linker where it would
|
|
// throw a NPE. For now, return false which will mark this class loader as unsupported.
|
|
LOG(ERROR) << "Unexpected null in the dex element list";
|
|
return false;
|
|
}
|
|
ObjPtr<mirror::Object> dex_file = dex_file_field->GetObject(element);
|
|
if (!CollectDexFilesFromJavaDexFile(dex_file, cookie_field, out_dex_files)) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool GetDexFilesFromDexElementsArray(
|
|
ScopedObjectAccessAlreadyRunnable& soa,
|
|
Handle<mirror::ObjectArray<mirror::Object>> dex_elements,
|
|
std::vector<const DexFile*>* out_dex_files) REQUIRES_SHARED(Locks::mutator_lock_) {
|
|
DCHECK(dex_elements != nullptr);
|
|
|
|
ArtField* const cookie_field =
|
|
jni::DecodeArtField(WellKnownClasses::dalvik_system_DexFile_cookie);
|
|
ArtField* const dex_file_field =
|
|
jni::DecodeArtField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile);
|
|
ObjPtr<mirror::Class> const element_class = soa.Decode<mirror::Class>(
|
|
WellKnownClasses::dalvik_system_DexPathList__Element);
|
|
ObjPtr<mirror::Class> const dexfile_class = soa.Decode<mirror::Class>(
|
|
WellKnownClasses::dalvik_system_DexFile);
|
|
|
|
for (int32_t i = 0; i < dex_elements->GetLength(); ++i) {
|
|
mirror::Object* element = dex_elements->GetWithoutChecks(i);
|
|
// We can hit a null element here because this is invoked with a partially filled dex_elements
|
|
// array from DexPathList. DexPathList will open each dex sequentially, each time passing the
|
|
// list of dex files which were opened before.
|
|
if (element == nullptr) {
|
|
continue;
|
|
}
|
|
|
|
// We support this being dalvik.system.DexPathList$Element and dalvik.system.DexFile.
|
|
// TODO(calin): Code caried over oat_file_manager: supporting both classes seem to be
|
|
// a historical glitch. All the java code opens dex files using an array of Elements.
|
|
ObjPtr<mirror::Object> dex_file;
|
|
if (element_class == element->GetClass()) {
|
|
dex_file = dex_file_field->GetObject(element);
|
|
} else if (dexfile_class == element->GetClass()) {
|
|
dex_file = element;
|
|
} else {
|
|
LOG(ERROR) << "Unsupported element in dex_elements: "
|
|
<< mirror::Class::PrettyClass(element->GetClass());
|
|
return false;
|
|
}
|
|
|
|
if (!CollectDexFilesFromJavaDexFile(dex_file, cookie_field, out_dex_files)) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Adds the `class_loader` info to the `context`.
|
|
// The dex file present in `dex_elements` array (if not null) will be added at the end of
|
|
// the classpath.
|
|
// This method is recursive (w.r.t. the class loader parent) and will stop once it reaches the
|
|
// BootClassLoader. Note that the class loader chain is expected to be short.
|
|
bool ClassLoaderContext::AddInfoToContextFromClassLoader(
|
|
ScopedObjectAccessAlreadyRunnable& soa,
|
|
Handle<mirror::ClassLoader> class_loader,
|
|
Handle<mirror::ObjectArray<mirror::Object>> dex_elements)
|
|
REQUIRES_SHARED(Locks::mutator_lock_) {
|
|
if (ClassLinker::IsBootClassLoader(soa, class_loader.Get())) {
|
|
// Nothing to do for the boot class loader as we don't add its dex files to the context.
|
|
return true;
|
|
}
|
|
|
|
ClassLoaderContext::ClassLoaderType type;
|
|
if (IsPathOrDexClassLoader(soa, class_loader)) {
|
|
type = kPathClassLoader;
|
|
} else if (IsDelegateLastClassLoader(soa, class_loader)) {
|
|
type = kDelegateLastClassLoader;
|
|
} else {
|
|
LOG(WARNING) << "Unsupported class loader";
|
|
return false;
|
|
}
|
|
|
|
// Inspect the class loader for its dex files.
|
|
std::vector<const DexFile*> dex_files_loaded;
|
|
CollectDexFilesFromSupportedClassLoader(soa, class_loader, &dex_files_loaded);
|
|
|
|
// If we have a dex_elements array extract its dex elements now.
|
|
// This is used in two situations:
|
|
// 1) when a new ClassLoader is created DexPathList will open each dex file sequentially
|
|
// passing the list of already open dex files each time. This ensures that we see the
|
|
// correct context even if the ClassLoader under construction is not fully build.
|
|
// 2) when apk splits are loaded on the fly, the framework will load their dex files by
|
|
// appending them to the current class loader. When the new code paths are loaded in
|
|
// BaseDexClassLoader, the paths already present in the class loader will be passed
|
|
// in the dex_elements array.
|
|
if (dex_elements != nullptr) {
|
|
GetDexFilesFromDexElementsArray(soa, dex_elements, &dex_files_loaded);
|
|
}
|
|
|
|
class_loader_chain_.push_back(ClassLoaderContext::ClassLoaderInfo(type));
|
|
ClassLoaderInfo& info = class_loader_chain_.back();
|
|
for (const DexFile* dex_file : dex_files_loaded) {
|
|
info.classpath.push_back(dex_file->GetLocation());
|
|
info.checksums.push_back(dex_file->GetLocationChecksum());
|
|
info.opened_dex_files.emplace_back(dex_file);
|
|
}
|
|
|
|
// We created the ClassLoaderInfo for the current loader. Move on to its parent.
|
|
|
|
StackHandleScope<1> hs(Thread::Current());
|
|
Handle<mirror::ClassLoader> parent = hs.NewHandle(class_loader->GetParent());
|
|
|
|
// Note that dex_elements array is null here. The elements are considered to be part of the
|
|
// current class loader and are not passed to the parents.
|
|
ScopedNullHandle<mirror::ObjectArray<mirror::Object>> null_dex_elements;
|
|
return AddInfoToContextFromClassLoader(soa, parent, null_dex_elements);
|
|
}
|
|
|
|
std::unique_ptr<ClassLoaderContext> ClassLoaderContext::CreateContextForClassLoader(
|
|
jobject class_loader,
|
|
jobjectArray dex_elements) {
|
|
CHECK(class_loader != nullptr);
|
|
|
|
ScopedObjectAccess soa(Thread::Current());
|
|
StackHandleScope<2> hs(soa.Self());
|
|
Handle<mirror::ClassLoader> h_class_loader =
|
|
hs.NewHandle(soa.Decode<mirror::ClassLoader>(class_loader));
|
|
Handle<mirror::ObjectArray<mirror::Object>> h_dex_elements =
|
|
hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Object>>(dex_elements));
|
|
|
|
std::unique_ptr<ClassLoaderContext> result(new ClassLoaderContext(/*owns_the_dex_files*/ false));
|
|
if (result->AddInfoToContextFromClassLoader(soa, h_class_loader, h_dex_elements)) {
|
|
return result;
|
|
} else {
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
static bool IsAbsoluteLocation(const std::string& location) {
|
|
return !location.empty() && location[0] == '/';
|
|
}
|
|
|
|
bool ClassLoaderContext::VerifyClassLoaderContextMatch(const std::string& context_spec) const {
|
|
DCHECK(dex_files_open_attempted_);
|
|
DCHECK(dex_files_open_result_);
|
|
|
|
ClassLoaderContext expected_context;
|
|
if (!expected_context.Parse(context_spec, /*parse_checksums*/ true)) {
|
|
LOG(WARNING) << "Invalid class loader context: " << context_spec;
|
|
return false;
|
|
}
|
|
|
|
// Special shared library contexts always match. They essentially instruct the runtime
|
|
// to ignore the class path check because the oat file is known to be loaded in different
|
|
// contexts. OatFileManager will further verify if the oat file can be loaded based on the
|
|
// collision check.
|
|
if (special_shared_library_ || expected_context.special_shared_library_) {
|
|
return true;
|
|
}
|
|
|
|
if (expected_context.class_loader_chain_.size() != class_loader_chain_.size()) {
|
|
LOG(WARNING) << "ClassLoaderContext size mismatch. expected="
|
|
<< expected_context.class_loader_chain_.size()
|
|
<< ", actual=" << class_loader_chain_.size()
|
|
<< " (" << context_spec << " | " << EncodeContextForOatFile("") << ")";
|
|
return false;
|
|
}
|
|
|
|
for (size_t i = 0; i < class_loader_chain_.size(); i++) {
|
|
const ClassLoaderInfo& info = class_loader_chain_[i];
|
|
const ClassLoaderInfo& expected_info = expected_context.class_loader_chain_[i];
|
|
if (info.type != expected_info.type) {
|
|
LOG(WARNING) << "ClassLoaderContext type mismatch for position " << i
|
|
<< ". expected=" << GetClassLoaderTypeName(expected_info.type)
|
|
<< ", found=" << GetClassLoaderTypeName(info.type)
|
|
<< " (" << context_spec << " | " << EncodeContextForOatFile("") << ")";
|
|
return false;
|
|
}
|
|
if (info.classpath.size() != expected_info.classpath.size()) {
|
|
LOG(WARNING) << "ClassLoaderContext classpath size mismatch for position " << i
|
|
<< ". expected=" << expected_info.classpath.size()
|
|
<< ", found=" << info.classpath.size()
|
|
<< " (" << context_spec << " | " << EncodeContextForOatFile("") << ")";
|
|
return false;
|
|
}
|
|
|
|
DCHECK_EQ(info.classpath.size(), info.checksums.size());
|
|
DCHECK_EQ(expected_info.classpath.size(), expected_info.checksums.size());
|
|
|
|
for (size_t k = 0; k < info.classpath.size(); k++) {
|
|
// Compute the dex location that must be compared.
|
|
// We shouldn't do a naive comparison `info.classpath[k] == expected_info.classpath[k]`
|
|
// because even if they refer to the same file, one could be encoded as a relative location
|
|
// and the other as an absolute one.
|
|
bool is_dex_name_absolute = IsAbsoluteLocation(info.classpath[k]);
|
|
bool is_expected_dex_name_absolute = IsAbsoluteLocation(expected_info.classpath[k]);
|
|
std::string dex_name;
|
|
std::string expected_dex_name;
|
|
|
|
if (is_dex_name_absolute == is_expected_dex_name_absolute) {
|
|
// If both locations are absolute or relative then compare them as they are.
|
|
// This is usually the case for: shared libraries and secondary dex files.
|
|
dex_name = info.classpath[k];
|
|
expected_dex_name = expected_info.classpath[k];
|
|
} else if (is_dex_name_absolute) {
|
|
// The runtime name is absolute but the compiled name (the expected one) is relative.
|
|
// This is the case for split apks which depend on base or on other splits.
|
|
dex_name = info.classpath[k];
|
|
expected_dex_name = OatFile::ResolveRelativeEncodedDexLocation(
|
|
info.classpath[k].c_str(), expected_info.classpath[k]);
|
|
} else {
|
|
// The runtime name is relative but the compiled name is absolute.
|
|
// There is no expected use case that would end up here as dex files are always loaded
|
|
// with their absolute location. However, be tolerant and do the best effort (in case
|
|
// there are unexpected new use case...).
|
|
DCHECK(is_expected_dex_name_absolute);
|
|
dex_name = OatFile::ResolveRelativeEncodedDexLocation(
|
|
expected_info.classpath[k].c_str(), info.classpath[k]);
|
|
expected_dex_name = expected_info.classpath[k];
|
|
}
|
|
|
|
// Compare the locations.
|
|
if (dex_name != expected_dex_name) {
|
|
LOG(WARNING) << "ClassLoaderContext classpath element mismatch for position " << i
|
|
<< ". expected=" << expected_info.classpath[k]
|
|
<< ", found=" << info.classpath[k]
|
|
<< " (" << context_spec << " | " << EncodeContextForOatFile("") << ")";
|
|
return false;
|
|
}
|
|
|
|
// Compare the checksums.
|
|
if (info.checksums[k] != expected_info.checksums[k]) {
|
|
LOG(WARNING) << "ClassLoaderContext classpath element checksum mismatch for position " << i
|
|
<< ". expected=" << expected_info.checksums[k]
|
|
<< ", found=" << info.checksums[k]
|
|
<< " (" << context_spec << " | " << EncodeContextForOatFile("") << ")";
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
jclass ClassLoaderContext::GetClassLoaderClass(ClassLoaderType type) {
|
|
switch (type) {
|
|
case kPathClassLoader: return WellKnownClasses::dalvik_system_PathClassLoader;
|
|
case kDelegateLastClassLoader: return WellKnownClasses::dalvik_system_DelegateLastClassLoader;
|
|
case kInvalidClassLoader: break; // will fail after the switch.
|
|
}
|
|
LOG(FATAL) << "Invalid class loader type " << type;
|
|
UNREACHABLE();
|
|
}
|
|
|
|
} // namespace art
|
|
|