cmdline/cmdline.h - LeafOS-Project/android_art - Gitiles

 /*
  * Copyright (C) 2014 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.
  */

 #ifndef ART_CMDLINE_CMDLINE_H_
 #define ART_CMDLINE_CMDLINE_H_

 #include <stdio.h>
 #include <stdlib.h>

 #include <fstream>
 #include <iostream>
 #include <string>
 #include <string_view>

 #include "android-base/stringprintf.h"

 #include "base/file_utils.h"
 #include "base/logging.h"
 #include "base/mutex.h"
 #include "base/string_view_cpp20.h"
 #include "noop_compiler_callbacks.h"
 #include "runtime.h"

 #if !defined(NDEBUG)
 #define DBG_LOG LOG(INFO)
 #else
 #define DBG_LOG LOG(DEBUG)
 #endif

 namespace art {

 // TODO: Move to <runtime/utils.h> and remove all copies of this function.
 static bool LocationToFilename(const std::string& location, InstructionSet isa,
                                std::string* filename) {
   bool has_system = false;
   bool has_cache = false;
   // image_location = /system/framework/boot.art
   // system_image_filename = /system/framework/<image_isa>/boot.art
   std::string system_filename(GetSystemImageFilename(location.c_str(), isa));
   if (OS::FileExists(system_filename.c_str())) {
     has_system = true;
   }

   bool have_android_data = false;
   bool dalvik_cache_exists = false;
   bool is_global_cache = false;
   std::string dalvik_cache;
   GetDalvikCache(GetInstructionSetString(isa), false, &dalvik_cache,
                  &have_android_data, &dalvik_cache_exists, &is_global_cache);

   std::string cache_filename;
   if (have_android_data && dalvik_cache_exists) {
     // Always set output location even if it does not exist,
     // so that the caller knows where to create the image.
     //
     // image_location = /system/framework/boot.art
     // *image_filename = /data/dalvik-cache/<image_isa>/boot.art
     std::string error_msg;
     if (GetDalvikCacheFilename(location.c_str(), dalvik_cache.c_str(),
                                &cache_filename, &error_msg)) {
       has_cache = true;
     }
   }
   if (has_system) {
     *filename = system_filename;
     return true;
   } else if (has_cache) {
     *filename = cache_filename;
     return true;
   } else {
     *filename = system_filename;
     return false;
   }
 }

 static Runtime* StartRuntime(const char* boot_image_location,
                              InstructionSet instruction_set,
                              const std::vector<const char*>& runtime_args) {
   CHECK(boot_image_location != nullptr);

   RuntimeOptions options;

   // We are more like a compiler than a run-time. We don't want to execute code.
   {
     static NoopCompilerCallbacks callbacks;
     options.push_back(std::make_pair("compilercallbacks", &callbacks));
   }

   // Boot image location.
   {
     std::string boot_image_option;
     boot_image_option += "-Ximage:";
     boot_image_option += boot_image_location;
     options.push_back(std::make_pair(boot_image_option, nullptr));
   }

   // Instruction set.
   options.push_back(
       std::make_pair("imageinstructionset",
                      reinterpret_cast<const void*>(GetInstructionSetString(instruction_set))));

   // Explicit runtime args.
   for (const char* runtime_arg : runtime_args) {
     options.push_back(std::make_pair(runtime_arg, nullptr));
   }

   // None of the command line tools need sig chain. If this changes we'll need
   // to upgrade this option to a proper parameter.
   options.push_back(std::make_pair("-Xno-sig-chain", nullptr));
   if (!Runtime::Create(options, false)) {
     fprintf(stderr, "Failed to create runtime\n");
     return nullptr;
   }

   // Runtime::Create acquired the mutator_lock_ that is normally given away when we Runtime::Start,
   // give it away now and then switch to a more manageable ScopedObjectAccess.
   Thread::Current()->TransitionFromRunnableToSuspended(kNative);

   return Runtime::Current();
 }

 struct CmdlineArgs {
   enum ParseStatus {
     kParseOk,               // Parse successful. Do not set the error message.
     kParseUnknownArgument,  // Unknown argument. Do not set the error message.
     kParseError,            // Parse ok, but failed elsewhere. Print the set error message.
   };

   bool Parse(int argc, char** argv) {
     // Skip over argv[0].
     argv++;
     argc--;

     if (argc == 0) {
       fprintf(stderr, "No arguments specified\n");
       PrintUsage();
       return false;
     }

     std::string error_msg;
     for (int i = 0; i < argc; i++) {
       const char* const raw_option = argv[i];
       const std::string_view option(raw_option);
       if (StartsWith(option, "--boot-image=")) {
         boot_image_location_ = raw_option + strlen("--boot-image=");
       } else if (StartsWith(option, "--instruction-set=")) {
         const char* const instruction_set_str = raw_option + strlen("--instruction-set=");
         instruction_set_ = GetInstructionSetFromString(instruction_set_str);
         if (instruction_set_ == InstructionSet::kNone) {
           fprintf(stderr, "Unsupported instruction set %s\n", instruction_set_str);
           PrintUsage();
           return false;
         }
       } else if (option == "--runtime-arg") {
         if (i + 1 == argc) {
           fprintf(stderr, "Missing argument for --runtime-arg\n");
           PrintUsage();
           return false;
         }
         ++i;
         runtime_args_.push_back(argv[i]);
       } else if (StartsWith(option, "--output=")) {
         output_name_ = std::string(option.substr(strlen("--output=")));
         const char* filename = output_name_.c_str();
         out_.reset(new std::ofstream(filename));
         if (!out_->good()) {
           fprintf(stderr, "Failed to open output filename %s\n", filename);
           PrintUsage();
           return false;
         }
         os_ = out_.get();
       } else {
         ParseStatus parse_status = ParseCustom(raw_option, option.length(), &error_msg);

         if (parse_status == kParseUnknownArgument) {
           fprintf(stderr, "Unknown argument %s\n", option.data());
         }

         if (parse_status != kParseOk) {
           fprintf(stderr, "%s\n", error_msg.c_str());
           PrintUsage();
           return false;
         }
       }
     }

     DBG_LOG << "will call parse checks";

     {
       ParseStatus checks_status = ParseChecks(&error_msg);
       if (checks_status != kParseOk) {
           fprintf(stderr, "%s\n", error_msg.c_str());
           PrintUsage();
           return false;
       }
     }

     return true;
   }

   virtual std::string GetUsage() const {
     std::string usage;

     usage +=  // Required.
         "  --boot-image=<file.art>: provide the image location for the boot class path.\n"
         "      Do not include the arch as part of the name, it is added automatically.\n"
         "      Example: --boot-image=/system/framework/boot.art\n"
         "               (specifies /system/framework/<arch>/boot.art as the image file)\n"
         "\n";
     usage += android::base::StringPrintf(  // Optional.
         "  --instruction-set=(arm|arm64|x86|x86_64): for locating the image\n"
         "      file based on the image location set.\n"
         "      Example: --instruction-set=x86\n"
         "      Default: %s\n"
         "\n",
         GetInstructionSetString(kRuntimeISA));
     usage +=
         "  --runtime-arg <argument> used to specify various arguments for the runtime\n"
         "      such as initial heap size, maximum heap size, and verbose output.\n"
         "      Use a separate --runtime-arg switch for each argument.\n"
         "      Example: --runtime-arg -Xms256m\n"
         "\n";
     usage +=  // Optional.
         "  --output=<file> may be used to send the output to a file.\n"
         "      Example: --output=/tmp/oatdump.txt\n"
         "\n";

     return usage;
   }

   // Specified by --boot-image.
   const char* boot_image_location_ = nullptr;
   // Specified by --instruction-set.
   InstructionSet instruction_set_ = InstructionSet::kNone;
   // Runtime arguments specified by --runtime-arg.
   std::vector<const char*> runtime_args_;
   // Specified by --output.
   std::ostream* os_ = &std::cout;
   std::unique_ptr<std::ofstream> out_;  // If something besides cout is used
   std::string output_name_;

   virtual ~CmdlineArgs() {}

   bool ParseCheckBootImage(std::string* error_msg) {
     if (boot_image_location_ == nullptr) {
       *error_msg = "--boot-image must be specified";
       return false;
     }
     if (instruction_set_ == InstructionSet::kNone) {
       LOG(WARNING) << "No instruction set given, assuming " << GetInstructionSetString(kRuntimeISA);
       instruction_set_ = kRuntimeISA;
     }

     DBG_LOG << "boot image location: " << boot_image_location_;

     // Checks for --boot-image location.
     {
       std::string boot_image_location = boot_image_location_;
       size_t separator_pos = boot_image_location.find(':');
       if (separator_pos != std::string::npos) {
         boot_image_location = boot_image_location.substr(/*pos*/ 0u, /*size*/ separator_pos);
       }
       size_t file_name_idx = boot_image_location.rfind('/');
       if (file_name_idx == std::string::npos) {  // Prevent a InsertIsaDirectory check failure.
         *error_msg = "Boot image location must have a / in it";
         return false;
       }

       // Don't let image locations with the 'arch' in it through, since it's not a location.
       // This prevents a common error "Could not create an image space..." when initing the Runtime.
       if (file_name_idx != std::string::npos) {
         std::string no_file_name = boot_image_location.substr(0, file_name_idx);
         size_t ancestor_dirs_idx = no_file_name.rfind('/');

         std::string parent_dir_name;
         if (ancestor_dirs_idx != std::string::npos) {
           parent_dir_name = no_file_name.substr(ancestor_dirs_idx + 1);
         } else {
           parent_dir_name = no_file_name;
         }

         DBG_LOG << "boot_image_location parent_dir_name was " << parent_dir_name;

         if (GetInstructionSetFromString(parent_dir_name.c_str()) != InstructionSet::kNone) {
           *error_msg = "Do not specify the architecture as part of the boot image location";
           return false;
         }
       }

       // Check that the boot image location points to a valid file name.
       std::string file_name;
       if (!LocationToFilename(boot_image_location, instruction_set_, &file_name)) {
         *error_msg = android::base::StringPrintf(
             "No corresponding file for location '%s' (filename '%s') exists",
             boot_image_location.c_str(),
             file_name.c_str());
         return false;
       }

       DBG_LOG << "boot_image_filename does exist: " << file_name;
     }

     return true;
   }

   void PrintUsage() {
     fprintf(stderr, "%s", GetUsage().c_str());
   }

  protected:
   virtual ParseStatus ParseCustom(const char* raw_option ATTRIBUTE_UNUSED,
                                   size_t raw_option_length ATTRIBUTE_UNUSED,
                                   std::string* error_msg ATTRIBUTE_UNUSED) {
     return kParseUnknownArgument;
   }

   virtual ParseStatus ParseChecks(std::string* error_msg ATTRIBUTE_UNUSED) {
     return kParseOk;
   }
 };

 template <typename Args = CmdlineArgs>
 struct CmdlineMain {
   int Main(int argc, char** argv) {
     Locks::Init();
     InitLogging(argv, Runtime::Abort);
     std::unique_ptr<Args> args = std::unique_ptr<Args>(CreateArguments());
     args_ = args.get();

     DBG_LOG << "Try to parse";

     if (args_ == nullptr || !args_->Parse(argc, argv)) {
       return EXIT_FAILURE;
     }

     bool needs_runtime = NeedsRuntime();
     std::unique_ptr<Runtime> runtime;


     if (needs_runtime) {
       std::string error_msg;
       if (!args_->ParseCheckBootImage(&error_msg)) {
         fprintf(stderr, "%s\n", error_msg.c_str());
         args_->PrintUsage();
         return EXIT_FAILURE;
       }
       runtime.reset(CreateRuntime(args.get()));
       if (runtime == nullptr) {
         return EXIT_FAILURE;
       }
       if (!ExecuteWithRuntime(runtime.get())) {
         return EXIT_FAILURE;
       }
     } else {
       if (!ExecuteWithoutRuntime()) {
         return EXIT_FAILURE;
       }
     }

     if (!ExecuteCommon()) {
       return EXIT_FAILURE;
     }

     return EXIT_SUCCESS;
   }

   // Override this function to create your own arguments.
   // Usually will want to return a subtype of CmdlineArgs.
   virtual Args* CreateArguments() {
     return new Args();
   }

   // Override this function to do something else with the runtime.
   virtual bool ExecuteWithRuntime(Runtime* runtime) {
     CHECK(runtime != nullptr);
     // Do nothing
     return true;
   }

   // Does the code execution need a runtime? Sometimes it doesn't.
   virtual bool NeedsRuntime() {
     return true;
   }

   // Do execution without having created a runtime.
   virtual bool ExecuteWithoutRuntime() {
     return true;
   }

   // Continue execution after ExecuteWith[out]Runtime
   virtual bool ExecuteCommon() {
     return true;
   }

   virtual ~CmdlineMain() {}

  protected:
   Args* args_ = nullptr;

  private:
   Runtime* CreateRuntime(CmdlineArgs* args) {
     CHECK(args != nullptr);

     return StartRuntime(args->boot_image_location_, args->instruction_set_, args_->runtime_args_);
   }
 };
 }  // namespace art

 #endif  // ART_CMDLINE_CMDLINE_H_
	/*
	* Copyright (C) 2014 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.
	*/

	#ifndef ART_CMDLINE_CMDLINE_H_
	#define ART_CMDLINE_CMDLINE_H_

	#include <stdio.h>
	#include <stdlib.h>

	#include <fstream>
	#include <iostream>
	#include <string>
	#include <string_view>

	#include "android-base/stringprintf.h"

	#include "base/file_utils.h"
	#include "base/logging.h"
	#include "base/mutex.h"
	#include "base/string_view_cpp20.h"
	#include "noop_compiler_callbacks.h"
	#include "runtime.h"

	#if !defined(NDEBUG)
	#define DBG_LOG LOG(INFO)
	#else
	#define DBG_LOG LOG(DEBUG)
	#endif

	namespace art {

	// TODO: Move to <runtime/utils.h> and remove all copies of this function.
	static bool LocationToFilename(const std::string& location, InstructionSet isa,
	std::string* filename) {
	bool has_system = false;
	bool has_cache = false;
	// image_location = /system/framework/boot.art
	// system_image_filename = /system/framework/<image_isa>/boot.art
	std::string system_filename(GetSystemImageFilename(location.c_str(), isa));
	if (OS::FileExists(system_filename.c_str())) {
	has_system = true;
	}

	bool have_android_data = false;
	bool dalvik_cache_exists = false;
	bool is_global_cache = false;
	std::string dalvik_cache;
	GetDalvikCache(GetInstructionSetString(isa), false, &dalvik_cache,
	&have_android_data, &dalvik_cache_exists, &is_global_cache);

	std::string cache_filename;
	if (have_android_data && dalvik_cache_exists) {
	// Always set output location even if it does not exist,
	// so that the caller knows where to create the image.
	//
	// image_location = /system/framework/boot.art
	// *image_filename = /data/dalvik-cache/<image_isa>/boot.art
	std::string error_msg;
	if (GetDalvikCacheFilename(location.c_str(), dalvik_cache.c_str(),
	&cache_filename, &error_msg)) {
	has_cache = true;
	}
	}
	if (has_system) {
	*filename = system_filename;
	return true;
	} else if (has_cache) {
	*filename = cache_filename;
	return true;
	} else {
	*filename = system_filename;
	return false;
	}
	}

	static Runtime* StartRuntime(const char* boot_image_location,
	InstructionSet instruction_set,
	const std::vector<const char*>& runtime_args) {
	CHECK(boot_image_location != nullptr);

	RuntimeOptions options;

	// We are more like a compiler than a run-time. We don't want to execute code.
	{
	static NoopCompilerCallbacks callbacks;
	options.push_back(std::make_pair("compilercallbacks", &callbacks));
	}

	// Boot image location.
	{
	std::string boot_image_option;
	boot_image_option += "-Ximage:";
	boot_image_option += boot_image_location;
	options.push_back(std::make_pair(boot_image_option, nullptr));
	}

	// Instruction set.
	options.push_back(
	std::make_pair("imageinstructionset",
	reinterpret_cast<const void*>(GetInstructionSetString(instruction_set))));

	// Explicit runtime args.
	for (const char* runtime_arg : runtime_args) {
	options.push_back(std::make_pair(runtime_arg, nullptr));
	}

	// None of the command line tools need sig chain. If this changes we'll need
	// to upgrade this option to a proper parameter.
	options.push_back(std::make_pair("-Xno-sig-chain", nullptr));
	if (!Runtime::Create(options, false)) {
	fprintf(stderr, "Failed to create runtime\n");
	return nullptr;
	}

	// Runtime::Create acquired the mutator_lock_ that is normally given away when we Runtime::Start,
	// give it away now and then switch to a more manageable ScopedObjectAccess.
	Thread::Current()->TransitionFromRunnableToSuspended(kNative);

	return Runtime::Current();
	}

	struct CmdlineArgs {
	enum ParseStatus {
	kParseOk, // Parse successful. Do not set the error message.
	kParseUnknownArgument, // Unknown argument. Do not set the error message.
	kParseError, // Parse ok, but failed elsewhere. Print the set error message.
	};

	bool Parse(int argc, char** argv) {
	// Skip over argv[0].
	argv++;
	argc--;

	if (argc == 0) {
	fprintf(stderr, "No arguments specified\n");
	PrintUsage();
	return false;
	}

	std::string error_msg;
	for (int i = 0; i < argc; i++) {
	const char* const raw_option = argv[i];
	const std::string_view option(raw_option);
	if (StartsWith(option, "--boot-image=")) {
	boot_image_location_ = raw_option + strlen("--boot-image=");
	} else if (StartsWith(option, "--instruction-set=")) {
	const char* const instruction_set_str = raw_option + strlen("--instruction-set=");
	instruction_set_ = GetInstructionSetFromString(instruction_set_str);
	if (instruction_set_ == InstructionSet::kNone) {
	fprintf(stderr, "Unsupported instruction set %s\n", instruction_set_str);
	PrintUsage();
	return false;
	}
	} else if (option == "--runtime-arg") {
	if (i + 1 == argc) {
	fprintf(stderr, "Missing argument for --runtime-arg\n");
	PrintUsage();
	return false;
	}
	++i;
	runtime_args_.push_back(argv[i]);
	} else if (StartsWith(option, "--output=")) {
	output_name_ = std::string(option.substr(strlen("--output=")));
	const char* filename = output_name_.c_str();
	out_.reset(new std::ofstream(filename));
	if (!out_->good()) {
	fprintf(stderr, "Failed to open output filename %s\n", filename);
	PrintUsage();
	return false;
	}
	os_ = out_.get();
	} else {
	ParseStatus parse_status = ParseCustom(raw_option, option.length(), &error_msg);

	if (parse_status == kParseUnknownArgument) {
	fprintf(stderr, "Unknown argument %s\n", option.data());
	}

	if (parse_status != kParseOk) {
	fprintf(stderr, "%s\n", error_msg.c_str());
	PrintUsage();
	return false;
	}
	}
	}

	DBG_LOG << "will call parse checks";

	{
	ParseStatus checks_status = ParseChecks(&error_msg);
	if (checks_status != kParseOk) {
	fprintf(stderr, "%s\n", error_msg.c_str());
	PrintUsage();
	return false;
	}
	}

	return true;
	}

	virtual std::string GetUsage() const {
	std::string usage;

	usage += // Required.
	" --boot-image=<file.art>: provide the image location for the boot class path.\n"
	" Do not include the arch as part of the name, it is added automatically.\n"
	" Example: --boot-image=/system/framework/boot.art\n"
	" (specifies /system/framework/<arch>/boot.art as the image file)\n"
	"\n";
	usage += android::base::StringPrintf( // Optional.
	" --instruction-set=(arm\|arm64\|x86\|x86_64): for locating the image\n"
	" file based on the image location set.\n"
	" Example: --instruction-set=x86\n"
	" Default: %s\n"
	"\n",
	GetInstructionSetString(kRuntimeISA));
	usage +=
	" --runtime-arg <argument> used to specify various arguments for the runtime\n"
	" such as initial heap size, maximum heap size, and verbose output.\n"
	" Use a separate --runtime-arg switch for each argument.\n"
	" Example: --runtime-arg -Xms256m\n"
	"\n";
	usage += // Optional.
	" --output=<file> may be used to send the output to a file.\n"
	" Example: --output=/tmp/oatdump.txt\n"
	"\n";

	return usage;
	}

	// Specified by --boot-image.
	const char* boot_image_location_ = nullptr;
	// Specified by --instruction-set.
	InstructionSet instruction_set_ = InstructionSet::kNone;
	// Runtime arguments specified by --runtime-arg.
	std::vector<const char*> runtime_args_;
	// Specified by --output.
	std::ostream* os_ = &std::cout;
	std::unique_ptr<std::ofstream> out_; // If something besides cout is used
	std::string output_name_;

	virtual ~CmdlineArgs() {}

	bool ParseCheckBootImage(std::string* error_msg) {
	if (boot_image_location_ == nullptr) {
	*error_msg = "--boot-image must be specified";
	return false;
	}
	if (instruction_set_ == InstructionSet::kNone) {
	LOG(WARNING) << "No instruction set given, assuming " << GetInstructionSetString(kRuntimeISA);
	instruction_set_ = kRuntimeISA;
	}

	DBG_LOG << "boot image location: " << boot_image_location_;

	// Checks for --boot-image location.
	{
	std::string boot_image_location = boot_image_location_;
	size_t separator_pos = boot_image_location.find(':');
	if (separator_pos != std::string::npos) {
	boot_image_location = boot_image_location.substr(/pos/ 0u, /size/ separator_pos);
	}
	size_t file_name_idx = boot_image_location.rfind('/');
	if (file_name_idx == std::string::npos) { // Prevent a InsertIsaDirectory check failure.
	*error_msg = "Boot image location must have a / in it";
	return false;
	}

	// Don't let image locations with the 'arch' in it through, since it's not a location.
	// This prevents a common error "Could not create an image space..." when initing the Runtime.
	if (file_name_idx != std::string::npos) {
	std::string no_file_name = boot_image_location.substr(0, file_name_idx);
	size_t ancestor_dirs_idx = no_file_name.rfind('/');

	std::string parent_dir_name;
	if (ancestor_dirs_idx != std::string::npos) {
	parent_dir_name = no_file_name.substr(ancestor_dirs_idx + 1);
	} else {
	parent_dir_name = no_file_name;
	}

	DBG_LOG << "boot_image_location parent_dir_name was " << parent_dir_name;

	if (GetInstructionSetFromString(parent_dir_name.c_str()) != InstructionSet::kNone) {
	*error_msg = "Do not specify the architecture as part of the boot image location";
	return false;
	}
	}

	// Check that the boot image location points to a valid file name.
	std::string file_name;
	if (!LocationToFilename(boot_image_location, instruction_set_, &file_name)) {
	*error_msg = android::base::StringPrintf(
	"No corresponding file for location '%s' (filename '%s') exists",
	boot_image_location.c_str(),
	file_name.c_str());
	return false;
	}

	DBG_LOG << "boot_image_filename does exist: " << file_name;
	}

	return true;
	}

	void PrintUsage() {
	fprintf(stderr, "%s", GetUsage().c_str());
	}

	protected:
	virtual ParseStatus ParseCustom(const char* raw_option ATTRIBUTE_UNUSED,
	size_t raw_option_length ATTRIBUTE_UNUSED,
	std::string* error_msg ATTRIBUTE_UNUSED) {
	return kParseUnknownArgument;
	}

	virtual ParseStatus ParseChecks(std::string* error_msg ATTRIBUTE_UNUSED) {
	return kParseOk;
	}
	};

	template <typename Args = CmdlineArgs>
	struct CmdlineMain {
	int Main(int argc, char** argv) {
	Locks::Init();
	InitLogging(argv, Runtime::Abort);
	std::unique_ptr<Args> args = std::unique_ptr<Args>(CreateArguments());
	args_ = args.get();

	DBG_LOG << "Try to parse";

	if (args_ == nullptr \|\| !args_->Parse(argc, argv)) {
	return EXIT_FAILURE;
	}

	bool needs_runtime = NeedsRuntime();
	std::unique_ptr<Runtime> runtime;


	if (needs_runtime) {
	std::string error_msg;
	if (!args_->ParseCheckBootImage(&error_msg)) {
	fprintf(stderr, "%s\n", error_msg.c_str());
	args_->PrintUsage();
	return EXIT_FAILURE;
	}
	runtime.reset(CreateRuntime(args.get()));
	if (runtime == nullptr) {
	return EXIT_FAILURE;
	}
	if (!ExecuteWithRuntime(runtime.get())) {
	return EXIT_FAILURE;
	}
	} else {
	if (!ExecuteWithoutRuntime()) {
	return EXIT_FAILURE;
	}
	}

	if (!ExecuteCommon()) {
	return EXIT_FAILURE;
	}

	return EXIT_SUCCESS;
	}

	// Override this function to create your own arguments.
	// Usually will want to return a subtype of CmdlineArgs.
	virtual Args* CreateArguments() {
	return new Args();
	}

	// Override this function to do something else with the runtime.
	virtual bool ExecuteWithRuntime(Runtime* runtime) {
	CHECK(runtime != nullptr);
	// Do nothing
	return true;
	}

	// Does the code execution need a runtime? Sometimes it doesn't.
	virtual bool NeedsRuntime() {
	return true;
	}

	// Do execution without having created a runtime.
	virtual bool ExecuteWithoutRuntime() {
	return true;
	}

	// Continue execution after ExecuteWith[out]Runtime
	virtual bool ExecuteCommon() {
	return true;
	}

	virtual ~CmdlineMain() {}

	protected:
	Args* args_ = nullptr;

	private:
	Runtime* CreateRuntime(CmdlineArgs* args) {
	CHECK(args != nullptr);

	return StartRuntime(args->boot_image_location_, args->instruction_set_, args_->runtime_args_);
	}
	};
	} // namespace art

	#endif // ART_CMDLINE_CMDLINE_H_