tools/veridex/veridex.cc - platform/art - Git at Google

 /*
  * 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 "veridex.h"

 #include <android-base/file.h>

 #include "dex/dex_file.h"
 #include "dex/dex_file_loader.h"
 #include "hidden_api.h"
 #include "hidden_api_finder.h"
 #include "precise_hidden_api_finder.h"
 #include "resolver.h"

 #include <cstdlib>
 #include <sstream>

 namespace art {

 static VeriClass z_(Primitive::Type::kPrimBoolean, 0, nullptr);
 static VeriClass b_(Primitive::Type::kPrimByte, 0, nullptr);
 static VeriClass c_(Primitive::Type::kPrimChar, 0, nullptr);
 static VeriClass s_(Primitive::Type::kPrimShort, 0, nullptr);
 static VeriClass i_(Primitive::Type::kPrimInt, 0, nullptr);
 static VeriClass f_(Primitive::Type::kPrimFloat, 0, nullptr);
 static VeriClass d_(Primitive::Type::kPrimDouble, 0, nullptr);
 static VeriClass j_(Primitive::Type::kPrimLong, 0, nullptr);
 static VeriClass v_(Primitive::Type::kPrimVoid, 0, nullptr);

 VeriClass* VeriClass::boolean_ = &z_;
 VeriClass* VeriClass::byte_ = &b_;
 VeriClass* VeriClass::char_ = &c_;
 VeriClass* VeriClass::short_ = &s_;
 VeriClass* VeriClass::integer_ = &i_;
 VeriClass* VeriClass::float_ = &f_;
 VeriClass* VeriClass::double_ = &d_;
 VeriClass* VeriClass::long_ = &j_;
 VeriClass* VeriClass::void_ = &v_;

 // Will be set after boot classpath has been resolved.
 VeriClass* VeriClass::object_ = nullptr;
 VeriClass* VeriClass::class_ = nullptr;
 VeriClass* VeriClass::class_loader_ = nullptr;
 VeriClass* VeriClass::string_ = nullptr;
 VeriClass* VeriClass::throwable_ = nullptr;
 VeriMethod VeriClass::forName_ = nullptr;
 VeriMethod VeriClass::getField_ = nullptr;
 VeriMethod VeriClass::getDeclaredField_ = nullptr;
 VeriMethod VeriClass::getMethod_ = nullptr;
 VeriMethod VeriClass::getDeclaredMethod_ = nullptr;
 VeriMethod VeriClass::getClass_ = nullptr;
 VeriMethod VeriClass::loadClass_ = nullptr;
 VeriField VeriClass::sdkInt_ = nullptr;

 static const char* kDexFileOption = "--dex-file=";
 static const char* kStubsOption = "--core-stubs=";
 static const char* kFlagsOption = "--api-flags=";
 static const char* kImprecise = "--imprecise";
 static const char* kTargetSdkVersion = "--target-sdk-version=";
 static const char* kOnlyReportSdkUses = "--only-report-sdk-uses";

 struct VeridexOptions {
   const char* dex_file = nullptr;
   const char* core_stubs = nullptr;
   const char* flags_file = nullptr;
   bool precise = true;
   int target_sdk_version = 28; /* P */
   bool only_report_sdk_uses = false;
 };

 static const char* Substr(const char* str, int index) {
   return str + index;
 }

 static bool StartsWith(const char* str, const char* val) {
   return strlen(str) >= strlen(val) && memcmp(str, val, strlen(val)) == 0;
 }

 static void ParseArgs(VeridexOptions* options, int argc, char** argv) {
   // Skip over the command name.
   argv++;
   argc--;

   for (int i = 0; i < argc; ++i) {
     if (StartsWith(argv[i], kDexFileOption)) {
       options->dex_file = Substr(argv[i], strlen(kDexFileOption));
     } else if (StartsWith(argv[i], kStubsOption)) {
       options->core_stubs = Substr(argv[i], strlen(kStubsOption));
     } else if (StartsWith(argv[i], kFlagsOption)) {
       options->flags_file = Substr(argv[i], strlen(kFlagsOption));
     } else if (strcmp(argv[i], kImprecise) == 0) {
       options->precise = false;
     } else if (StartsWith(argv[i], kTargetSdkVersion)) {
       options->target_sdk_version = atoi(Substr(argv[i], strlen(kTargetSdkVersion)));
     } else if (strcmp(argv[i], kOnlyReportSdkUses) == 0) {
       options->only_report_sdk_uses = true;
     }
   }
 }

 static std::vector<std::string> Split(const std::string& str, char sep) {
   std::vector<std::string> tokens;
   std::string tmp;
   std::istringstream iss(str);
   while (std::getline(iss, tmp, sep)) {
     tokens.push_back(tmp);
   }
   return tokens;
 }

 class Veridex {
  public:
   static int Run(int argc, char** argv) {
     VeridexOptions options;
     ParseArgs(&options, argc, argv);
     android::base::InitLogging(argv);

     if (!options.dex_file) {
       LOG(ERROR) << "Required argument '" << kDexFileOption << "' not provided.";
       return 1;
     }

     gTargetSdkVersion = options.target_sdk_version;

     std::vector<std::string> boot_content;
     std::vector<std::string> app_content;
     std::vector<std::unique_ptr<const DexFile>> boot_dex_files;
     std::vector<std::unique_ptr<const DexFile>> app_dex_files;
     std::string error_msg;

     // Read the boot classpath.
     std::vector<std::string> boot_classpath = Split(options.core_stubs, ':');
     boot_content.resize(boot_classpath.size());
     uint32_t i = 0;
     for (const std::string& str : boot_classpath) {
       if (!Load(str, boot_content[i++], &boot_dex_files, &error_msg)) {
         LOG(ERROR) << error_msg;
         return 1;
       }
     }

     // Read the apps dex files.
     std::vector<std::string> app_files = Split(options.dex_file, ':');
     app_content.resize(app_files.size());
     i = 0;
     for (const std::string& str : app_files) {
       if (!Load(str, app_content[i++], &app_dex_files, &error_msg)) {
         LOG(ERROR) << error_msg;
         return 1;
       }
     }

     // Resolve classes/methods/fields defined in each dex file.

     // Cache of types we've seen, for quick class name lookups.
     TypeMap type_map;
     // Add internally defined primitives.
     type_map["Z"] = VeriClass::boolean_;
     type_map["B"] = VeriClass::byte_;
     type_map["S"] = VeriClass::short_;
     type_map["C"] = VeriClass::char_;
     type_map["I"] = VeriClass::integer_;
     type_map["F"] = VeriClass::float_;
     type_map["D"] = VeriClass::double_;
     type_map["J"] = VeriClass::long_;
     type_map["V"] = VeriClass::void_;

     // Cache of resolvers, to easily query address in memory to VeridexResolver.
     DexResolverMap resolver_map;

     std::vector<std::unique_ptr<VeridexResolver>> boot_resolvers;
     Resolve(boot_dex_files, resolver_map, type_map, &boot_resolvers);

     // Now that boot classpath has been resolved, fill classes and reflection
     // methods.
     VeriClass::object_ = type_map["Ljava/lang/Object;"];
     VeriClass::class_ = type_map["Ljava/lang/Class;"];
     VeriClass::class_loader_ = type_map["Ljava/lang/ClassLoader;"];
     VeriClass::string_ = type_map["Ljava/lang/String;"];
     VeriClass::throwable_ = type_map["Ljava/lang/Throwable;"];
     VeriClass::forName_ = boot_resolvers[0]->LookupDeclaredMethodIn(
         *VeriClass::class_, "forName", "(Ljava/lang/String;)Ljava/lang/Class;");
     VeriClass::getField_ = boot_resolvers[0]->LookupDeclaredMethodIn(
         *VeriClass::class_, "getField", "(Ljava/lang/String;)Ljava/lang/reflect/Field;");
     VeriClass::getDeclaredField_ = boot_resolvers[0]->LookupDeclaredMethodIn(
         *VeriClass::class_, "getDeclaredField", "(Ljava/lang/String;)Ljava/lang/reflect/Field;");
     VeriClass::getMethod_ = boot_resolvers[0]->LookupDeclaredMethodIn(
         *VeriClass::class_,
         "getMethod",
         "(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;");
     VeriClass::getDeclaredMethod_ = boot_resolvers[0]->LookupDeclaredMethodIn(
         *VeriClass::class_,
         "getDeclaredMethod",
         "(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;");
     VeriClass::getClass_ = boot_resolvers[0]->LookupDeclaredMethodIn(
         *VeriClass::object_, "getClass", "()Ljava/lang/Class;");
     VeriClass::loadClass_ = boot_resolvers[0]->LookupDeclaredMethodIn(
         *VeriClass::class_loader_, "loadClass", "(Ljava/lang/String;)Ljava/lang/Class;");

     VeriClass* version = type_map["Landroid/os/Build$VERSION;"];
     if (version != nullptr) {
       VeriClass::sdkInt_ = boot_resolvers[0]->LookupFieldIn(*version, "SDK_INT", "I");
     }

     std::vector<std::unique_ptr<VeridexResolver>> app_resolvers;
     Resolve(app_dex_files, resolver_map, type_map, &app_resolvers);

     // Find and log uses of hidden APIs.
     HiddenApi hidden_api(options.flags_file, options.only_report_sdk_uses);
     HiddenApiStats stats;

     HiddenApiFinder api_finder(hidden_api);
     api_finder.Run(app_resolvers);
     api_finder.Dump(std::cout, &stats, !options.precise);

     if (options.precise) {
       PreciseHiddenApiFinder precise_api_finder(hidden_api);
       precise_api_finder.Run(app_resolvers);
       precise_api_finder.Dump(std::cout, &stats);
     }

     DumpSummaryStats(std::cout, stats, options);

     if (options.precise) {
       std::cout << "To run an analysis that can give more reflection accesses, " << std::endl
                 << "but could include false positives, pass the --imprecise flag. " << std::endl;
     }

     return 0;
   }

  private:
   static void DumpSummaryStats(std::ostream& os,
                                const HiddenApiStats& stats,
                                const VeridexOptions& options) {
     static const char* kPrefix = "       ";
     if (options.only_report_sdk_uses) {
       os << stats.api_counts[hiddenapi::ApiList::Whitelist().GetIntValue()]
          << " SDK API uses." << std::endl;
     } else {
       os << stats.count << " hidden API(s) used: "
          << stats.linking_count << " linked against, "
          << stats.reflection_count << " through reflection" << std::endl;
       for (size_t i = 0; i < hiddenapi::ApiList::kValueCount; ++i) {
         hiddenapi::ApiList api_list = hiddenapi::ApiList::FromIntValue(i);
         if (api_list != hiddenapi::ApiList::Whitelist()) {
           os << kPrefix << stats.api_counts[i] << " in " << api_list << std::endl;
         }
       }
     }
   }

   static bool Load(const std::string& filename,
                    std::string& content,
                    std::vector<std::unique_ptr<const DexFile>>* dex_files,
                    std::string* error_msg) {
     if (filename.empty()) {
       *error_msg = "Missing file name";
       return false;
     }

     // TODO: once added, use an api to android::base to read a std::vector<uint8_t>.
     if (!android::base::ReadFileToString(filename.c_str(), &content)) {
       *error_msg = "ReadFileToString failed for " + filename;
       return false;
     }

     const DexFileLoader dex_file_loader;
     DexFileLoaderErrorCode error_code;
     static constexpr bool kVerifyChecksum = true;
     static constexpr bool kRunDexFileVerifier = true;
     if (!dex_file_loader.OpenAll(reinterpret_cast<const uint8_t*>(content.data()),
                                  content.size(),
                                  filename.c_str(),
                                  kRunDexFileVerifier,
                                  kVerifyChecksum,
                                  &error_code,
                                  error_msg,
                                  dex_files)) {
       if (error_code == DexFileLoaderErrorCode::kEntryNotFound) {
         LOG(INFO) << "No .dex found, skipping analysis.";
         return true;
       }
       return false;
     }

     return true;
   }

   static void Resolve(const std::vector<std::unique_ptr<const DexFile>>& dex_files,
                       DexResolverMap& resolver_map,
                       TypeMap& type_map,
                       std::vector<std::unique_ptr<VeridexResolver>>* resolvers) {
     for (const std::unique_ptr<const DexFile>& dex_file : dex_files) {
       VeridexResolver* resolver =
           new VeridexResolver(*dex_file.get(), resolver_map, type_map);
       resolvers->emplace_back(resolver);
       resolver_map[reinterpret_cast<uintptr_t>(dex_file->Begin())] = resolver;
     }

     for (const std::unique_ptr<VeridexResolver>& resolver : *resolvers) {
       resolver->Run();
     }
   }
 };

 }  // namespace art

 int main(int argc, char** argv) {
   return art::Veridex::Run(argc, argv);
 }
	/*
	* 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 "veridex.h"

	#include <android-base/file.h>

	#include "dex/dex_file.h"
	#include "dex/dex_file_loader.h"
	#include "hidden_api.h"
	#include "hidden_api_finder.h"
	#include "precise_hidden_api_finder.h"
	#include "resolver.h"

	#include <cstdlib>
	#include <sstream>

	namespace art {

	static VeriClass z_(Primitive::Type::kPrimBoolean, 0, nullptr);
	static VeriClass b_(Primitive::Type::kPrimByte, 0, nullptr);
	static VeriClass c_(Primitive::Type::kPrimChar, 0, nullptr);
	static VeriClass s_(Primitive::Type::kPrimShort, 0, nullptr);
	static VeriClass i_(Primitive::Type::kPrimInt, 0, nullptr);
	static VeriClass f_(Primitive::Type::kPrimFloat, 0, nullptr);
	static VeriClass d_(Primitive::Type::kPrimDouble, 0, nullptr);
	static VeriClass j_(Primitive::Type::kPrimLong, 0, nullptr);
	static VeriClass v_(Primitive::Type::kPrimVoid, 0, nullptr);

	VeriClass* VeriClass::boolean_ = &z_;
	VeriClass* VeriClass::byte_ = &b_;
	VeriClass* VeriClass::char_ = &c_;
	VeriClass* VeriClass::short_ = &s_;
	VeriClass* VeriClass::integer_ = &i_;
	VeriClass* VeriClass::float_ = &f_;
	VeriClass* VeriClass::double_ = &d_;
	VeriClass* VeriClass::long_ = &j_;
	VeriClass* VeriClass::void_ = &v_;

	// Will be set after boot classpath has been resolved.
	VeriClass* VeriClass::object_ = nullptr;
	VeriClass* VeriClass::class_ = nullptr;
	VeriClass* VeriClass::class_loader_ = nullptr;
	VeriClass* VeriClass::string_ = nullptr;
	VeriClass* VeriClass::throwable_ = nullptr;
	VeriMethod VeriClass::forName_ = nullptr;
	VeriMethod VeriClass::getField_ = nullptr;
	VeriMethod VeriClass::getDeclaredField_ = nullptr;
	VeriMethod VeriClass::getMethod_ = nullptr;
	VeriMethod VeriClass::getDeclaredMethod_ = nullptr;
	VeriMethod VeriClass::getClass_ = nullptr;
	VeriMethod VeriClass::loadClass_ = nullptr;
	VeriField VeriClass::sdkInt_ = nullptr;

	static const char* kDexFileOption = "--dex-file=";
	static const char* kStubsOption = "--core-stubs=";
	static const char* kFlagsOption = "--api-flags=";
	static const char* kImprecise = "--imprecise";
	static const char* kTargetSdkVersion = "--target-sdk-version=";
	static const char* kOnlyReportSdkUses = "--only-report-sdk-uses";

	struct VeridexOptions {
	const char* dex_file = nullptr;
	const char* core_stubs = nullptr;
	const char* flags_file = nullptr;
	bool precise = true;
	int target_sdk_version = 28; /* P */
	bool only_report_sdk_uses = false;
	};

	static const char* Substr(const char* str, int index) {
	return str + index;
	}

	static bool StartsWith(const char* str, const char* val) {
	return strlen(str) >= strlen(val) && memcmp(str, val, strlen(val)) == 0;
	}

	static void ParseArgs(VeridexOptions* options, int argc, char** argv) {
	// Skip over the command name.
	argv++;
	argc--;

	for (int i = 0; i < argc; ++i) {
	if (StartsWith(argv[i], kDexFileOption)) {
	options->dex_file = Substr(argv[i], strlen(kDexFileOption));
	} else if (StartsWith(argv[i], kStubsOption)) {
	options->core_stubs = Substr(argv[i], strlen(kStubsOption));
	} else if (StartsWith(argv[i], kFlagsOption)) {
	options->flags_file = Substr(argv[i], strlen(kFlagsOption));
	} else if (strcmp(argv[i], kImprecise) == 0) {
	options->precise = false;
	} else if (StartsWith(argv[i], kTargetSdkVersion)) {
	options->target_sdk_version = atoi(Substr(argv[i], strlen(kTargetSdkVersion)));
	} else if (strcmp(argv[i], kOnlyReportSdkUses) == 0) {
	options->only_report_sdk_uses = true;
	}
	}
	}

	static std::vector<std::string> Split(const std::string& str, char sep) {
	std::vector<std::string> tokens;
	std::string tmp;
	std::istringstream iss(str);
	while (std::getline(iss, tmp, sep)) {
	tokens.push_back(tmp);
	}
	return tokens;
	}

	class Veridex {
	public:
	static int Run(int argc, char** argv) {
	VeridexOptions options;
	ParseArgs(&options, argc, argv);
	android::base::InitLogging(argv);

	if (!options.dex_file) {
	LOG(ERROR) << "Required argument '" << kDexFileOption << "' not provided.";
	return 1;
	}

	gTargetSdkVersion = options.target_sdk_version;

	std::vector<std::string> boot_content;
	std::vector<std::string> app_content;
	std::vector<std::unique_ptr<const DexFile>> boot_dex_files;
	std::vector<std::unique_ptr<const DexFile>> app_dex_files;
	std::string error_msg;

	// Read the boot classpath.
	std::vector<std::string> boot_classpath = Split(options.core_stubs, ':');
	boot_content.resize(boot_classpath.size());
	uint32_t i = 0;
	for (const std::string& str : boot_classpath) {
	if (!Load(str, boot_content[i++], &boot_dex_files, &error_msg)) {
	LOG(ERROR) << error_msg;
	return 1;
	}
	}

	// Read the apps dex files.
	std::vector<std::string> app_files = Split(options.dex_file, ':');
	app_content.resize(app_files.size());
	i = 0;
	for (const std::string& str : app_files) {
	if (!Load(str, app_content[i++], &app_dex_files, &error_msg)) {
	LOG(ERROR) << error_msg;
	return 1;
	}
	}

	// Resolve classes/methods/fields defined in each dex file.

	// Cache of types we've seen, for quick class name lookups.
	TypeMap type_map;
	// Add internally defined primitives.
	type_map["Z"] = VeriClass::boolean_;
	type_map["B"] = VeriClass::byte_;
	type_map["S"] = VeriClass::short_;
	type_map["C"] = VeriClass::char_;
	type_map["I"] = VeriClass::integer_;
	type_map["F"] = VeriClass::float_;
	type_map["D"] = VeriClass::double_;
	type_map["J"] = VeriClass::long_;
	type_map["V"] = VeriClass::void_;

	// Cache of resolvers, to easily query address in memory to VeridexResolver.
	DexResolverMap resolver_map;

	std::vector<std::unique_ptr<VeridexResolver>> boot_resolvers;
	Resolve(boot_dex_files, resolver_map, type_map, &boot_resolvers);

	// Now that boot classpath has been resolved, fill classes and reflection
	// methods.
	VeriClass::object_ = type_map["Ljava/lang/Object;"];
	VeriClass::class_ = type_map["Ljava/lang/Class;"];
	VeriClass::class_loader_ = type_map["Ljava/lang/ClassLoader;"];
	VeriClass::string_ = type_map["Ljava/lang/String;"];
	VeriClass::throwable_ = type_map["Ljava/lang/Throwable;"];
	VeriClass::forName_ = boot_resolvers[0]->LookupDeclaredMethodIn(
	*VeriClass::class_, "forName", "(Ljava/lang/String;)Ljava/lang/Class;");
	VeriClass::getField_ = boot_resolvers[0]->LookupDeclaredMethodIn(
	*VeriClass::class_, "getField", "(Ljava/lang/String;)Ljava/lang/reflect/Field;");
	VeriClass::getDeclaredField_ = boot_resolvers[0]->LookupDeclaredMethodIn(
	*VeriClass::class_, "getDeclaredField", "(Ljava/lang/String;)Ljava/lang/reflect/Field;");
	VeriClass::getMethod_ = boot_resolvers[0]->LookupDeclaredMethodIn(
	*VeriClass::class_,
	"getMethod",
	"(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;");
	VeriClass::getDeclaredMethod_ = boot_resolvers[0]->LookupDeclaredMethodIn(
	*VeriClass::class_,
	"getDeclaredMethod",
	"(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;");
	VeriClass::getClass_ = boot_resolvers[0]->LookupDeclaredMethodIn(
	*VeriClass::object_, "getClass", "()Ljava/lang/Class;");
	VeriClass::loadClass_ = boot_resolvers[0]->LookupDeclaredMethodIn(
	*VeriClass::class_loader_, "loadClass", "(Ljava/lang/String;)Ljava/lang/Class;");

	VeriClass* version = type_map["Landroid/os/Build$VERSION;"];
	if (version != nullptr) {
	VeriClass::sdkInt_ = boot_resolvers[0]->LookupFieldIn(*version, "SDK_INT", "I");
	}

	std::vector<std::unique_ptr<VeridexResolver>> app_resolvers;
	Resolve(app_dex_files, resolver_map, type_map, &app_resolvers);

	// Find and log uses of hidden APIs.
	HiddenApi hidden_api(options.flags_file, options.only_report_sdk_uses);
	HiddenApiStats stats;

	HiddenApiFinder api_finder(hidden_api);
	api_finder.Run(app_resolvers);
	api_finder.Dump(std::cout, &stats, !options.precise);

	if (options.precise) {
	PreciseHiddenApiFinder precise_api_finder(hidden_api);
	precise_api_finder.Run(app_resolvers);
	precise_api_finder.Dump(std::cout, &stats);
	}

	DumpSummaryStats(std::cout, stats, options);

	if (options.precise) {
	std::cout << "To run an analysis that can give more reflection accesses, " << std::endl
	<< "but could include false positives, pass the --imprecise flag. " << std::endl;
	}

	return 0;
	}

	private:
	static void DumpSummaryStats(std::ostream& os,
	const HiddenApiStats& stats,
	const VeridexOptions& options) {
	static const char* kPrefix = " ";
	if (options.only_report_sdk_uses) {
	os << stats.api_counts[hiddenapi::ApiList::Whitelist().GetIntValue()]
	<< " SDK API uses." << std::endl;
	} else {
	os << stats.count << " hidden API(s) used: "
	<< stats.linking_count << " linked against, "
	<< stats.reflection_count << " through reflection" << std::endl;
	for (size_t i = 0; i < hiddenapi::ApiList::kValueCount; ++i) {
	hiddenapi::ApiList api_list = hiddenapi::ApiList::FromIntValue(i);
	if (api_list != hiddenapi::ApiList::Whitelist()) {
	os << kPrefix << stats.api_counts[i] << " in " << api_list << std::endl;
	}
	}
	}
	}

	static bool Load(const std::string& filename,
	std::string& content,
	std::vector<std::unique_ptr<const DexFile>>* dex_files,
	std::string* error_msg) {
	if (filename.empty()) {
	*error_msg = "Missing file name";
	return false;
	}

	// TODO: once added, use an api to android::base to read a std::vector<uint8_t>.
	if (!android::base::ReadFileToString(filename.c_str(), &content)) {
	*error_msg = "ReadFileToString failed for " + filename;
	return false;
	}

	const DexFileLoader dex_file_loader;
	DexFileLoaderErrorCode error_code;
	static constexpr bool kVerifyChecksum = true;
	static constexpr bool kRunDexFileVerifier = true;
	if (!dex_file_loader.OpenAll(reinterpret_cast<const uint8_t*>(content.data()),
	content.size(),
	filename.c_str(),
	kRunDexFileVerifier,
	kVerifyChecksum,
	&error_code,
	error_msg,
	dex_files)) {
	if (error_code == DexFileLoaderErrorCode::kEntryNotFound) {
	LOG(INFO) << "No .dex found, skipping analysis.";
	return true;
	}
	return false;
	}

	return true;
	}

	static void Resolve(const std::vector<std::unique_ptr<const DexFile>>& dex_files,
	DexResolverMap& resolver_map,
	TypeMap& type_map,
	std::vector<std::unique_ptr<VeridexResolver>>* resolvers) {
	for (const std::unique_ptr<const DexFile>& dex_file : dex_files) {
	VeridexResolver* resolver =
	new VeridexResolver(*dex_file.get(), resolver_map, type_map);
	resolvers->emplace_back(resolver);
	resolver_map[reinterpret_cast<uintptr_t>(dex_file->Begin())] = resolver;
	}

	for (const std::unique_ptr<VeridexResolver>& resolver : *resolvers) {
	resolver->Run();
	}
	}
	};

	} // namespace art

	int main(int argc, char** argv) {
	return art::Veridex::Run(argc, argv);
	}