artd/libdexopt.cc - LeafOS-Project/android_art - Gitiles

 /*
  * Copyright (C) 2021 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 "libdexopt.h"
 #define LOG_TAG "libdexopt"

 #include <map>
 #include <string>
 #include <vector>

 #include "android-base/stringprintf.h"
 #include "android-base/strings.h"
 #include "android-base/result.h"
 #include "base/file_utils.h"
 #include "log/log.h"

 #include "aidl/com/android/art/CompilerFilter.h"
 #include "aidl/com/android/art/DexoptBcpExtArgs.h"
 #include "aidl/com/android/art/DexoptSystemServerArgs.h"
 #include "aidl/com/android/art/Isa.h"

 namespace art {

 namespace {

 using aidl::com::android::art::CompilerFilter;
 using aidl::com::android::art::DexoptBcpExtArgs;
 using aidl::com::android::art::DexoptSystemServerArgs;
 using aidl::com::android::art::Isa;
 using android::base::Error;
 using android::base::Result;

 std::string GetEnvironmentVariableOrDie(const char* name) {
   const char* value = getenv(name);
   LOG_ALWAYS_FATAL_IF(value == nullptr, "%s is not defined.", name);
   return value;
 }

 std::string GetDex2oatBootClasspath() {
   return GetEnvironmentVariableOrDie("DEX2OATBOOTCLASSPATH");
 }

 std::string GetBootClasspath() {
   return GetEnvironmentVariableOrDie("BOOTCLASSPATH");
 }

 std::string ToInstructionSetString(Isa isa) {
   switch (isa) {
     case Isa::ARM:
     case Isa::THUMB2:
       return "arm";
     case Isa::ARM64:
       return "arm64";
     case Isa::X86:
       return "x86";
     case Isa::X86_64:
       return "x86_64";
     default:
       UNREACHABLE();
   }
 }

 const char* CompilerFilterAidlToString(CompilerFilter compiler_filter) {
   switch (compiler_filter) {
     case CompilerFilter::SPEED_PROFILE:
       return "speed-profile";
     case CompilerFilter::SPEED:
       return"speed";
     case CompilerFilter::VERIFY:
       return "verify";
     default:
       UNREACHABLE();
   }
 }

 Result<void> AddBootClasspath(/*inout*/ std::vector<std::string>& cmdline,
                               const std::string& bootclasspath_env,
                               const std::vector<std::string>& boot_classpaths,
                               const std::vector<int>& boot_classpath_fds) {
   if (boot_classpaths.empty()) {
     return Errorf("Missing BCP files");
   }

   if (boot_classpaths.size() != boot_classpath_fds.size()) {
     return Errorf("Number of BCP paths (%d) != number of FDs (%d)", boot_classpaths.size(),
                   boot_classpath_fds.size());
   }

   cmdline.emplace_back("--runtime-arg");
   cmdline.emplace_back("-Xbootclasspath:" + bootclasspath_env);

   // Construct a path->fd map from both arrays. If the client provides duplicated paths, only one
   // will be used. This is fine since the client may not be trusted any way.
   std::map<std::string, int> bcp_map;
   auto zip = [](const std::string &path, int fd) { return std::make_pair(path, fd); };
   std::transform(boot_classpaths.begin(), boot_classpaths.end(), boot_classpath_fds.begin(),
                  std::inserter(bcp_map, bcp_map.end()), zip);

   std::vector<std::string> jar_paths = android::base::Split(bootclasspath_env, ":");
   std::stringstream ss;
   ss << "-Xbootclasspathfds";
   for (auto& jar_path : jar_paths) {
     auto iter = bcp_map.find(jar_path);
     if (iter == bcp_map.end()) {
       ss << ":-1";
     } else {
       ss << ":" << std::to_string(iter->second);
       bcp_map.erase(iter);
     }
   }
   cmdline.emplace_back("--runtime-arg");
   cmdline.emplace_back(ss.str());

   if (!bcp_map.empty()) {
     std::stringstream error_ss;
     for (const auto &[key, _] : bcp_map) {
       error_ss << key << ":";
     }
     return Error() << "Residual BCP paths: " << error_ss.str();
   }
   return {};
 }

 Result<void> AddCompiledBootClasspathFdsIfAny(/*inout*/ std::vector<std::string>& cmdline,
                                               const DexoptSystemServerArgs& args) {
   // Result
   if ((args.bootClasspathImageFds.size() != args.bootClasspathOatFds.size()) ||
       (args.bootClasspathImageFds.size() != args.bootClasspathVdexFds.size()) ||
       (args.bootClasspathImageFds.size() != args.bootClasspaths.size())) {
     return Errorf("Inconsistent FD numbers of BCP artifacts: jar/image/vdex/oat: %d/%d/%d/%d",
                   args.bootClasspaths.size(), args.bootClasspathImageFds.size(),
                   args.bootClasspathVdexFds.size(), args.bootClasspathOatFds.size());
   }

   if (!args.bootClasspathImageFds.empty()) {
     cmdline.emplace_back("--runtime-arg");
     cmdline.emplace_back(
         "-Xbootclasspathimagefds:" + android::base::Join(args.bootClasspathImageFds, ':'));
     cmdline.emplace_back("--runtime-arg");
     cmdline.emplace_back(
         "-Xbootclasspathoatfds:" + android::base::Join(args.bootClasspathOatFds, ':'));
     cmdline.emplace_back("--runtime-arg");
     cmdline.emplace_back(
         "-Xbootclasspathvdexfds:" + android::base::Join(args.bootClasspathVdexFds, ':'));
   }
   return {};
 }

 void AddDex2OatConcurrencyArguments(/*inout*/ std::vector<std::string>& cmdline,
                                     int threads,
                                     const std::vector<int>& cpu_set) {
   if (threads > 0) {
       cmdline.emplace_back(android::base::StringPrintf("-j%d", threads));
   }
   if (!cpu_set.empty()) {
       cmdline.emplace_back("--cpu-set=" + android::base::Join(cpu_set, ','));
   }
 }

 void AddDex2OatCommonOptions(/*inout*/ std::vector<std::string>& cmdline) {
   cmdline.emplace_back("--android-root=out/empty");
   cmdline.emplace_back("--abort-on-hard-verifier-error");
   cmdline.emplace_back("--no-abort-on-soft-verifier-error");
   cmdline.emplace_back("--compilation-reason=boot");
   cmdline.emplace_back("--image-format=lz4");
   cmdline.emplace_back("--force-determinism");
   cmdline.emplace_back("--resolve-startup-const-strings=true");

   // Avoid storing dex2oat cmdline in oat header. We want to be sure that the compiled artifacts
   // are identical regardless of where the compilation happened. But some of the cmdline flags tends
   // to be unstable, e.g. those contains FD numbers. To avoid the problem, the whole cmdline is not
   // added to the oat header.
   cmdline.emplace_back("--avoid-storing-invocation");
 }

 void AddDex2OatDebugInfo(/*inout*/ std::vector<std::string>& cmdline) {
   cmdline.emplace_back("--generate-mini-debug-info");
   cmdline.emplace_back("--strip");
 }

 }  // namespace

 Result<void> AddDex2oatArgsFromBcpExtensionArgs(const DexoptBcpExtArgs& args,
                                                 /*out*/ std::vector<std::string>& cmdline) {
   // Common dex2oat flags
   AddDex2OatCommonOptions(cmdline);
   AddDex2OatDebugInfo(cmdline);

   cmdline.emplace_back("--instruction-set=" + ToInstructionSetString(args.isa));

   if (!args.profileFds.empty()) {
     for (int fd : args.profileFds) {
       cmdline.emplace_back(android::base::StringPrintf("--profile-file-fd=%d", fd));
     }
     cmdline.emplace_back("--compiler-filter=speed-profile");
   } else {
     cmdline.emplace_back("--compiler-filter=speed");
   }

   // Compile as a single image for fewer files and slightly less memory overhead.
   cmdline.emplace_back("--single-image");

   cmdline.emplace_back(android::base::StringPrintf("--base=0x%08x", ART_BASE_ADDRESS));

   if (args.dirtyImageObjectsFd >= 0) {
     cmdline.emplace_back(android::base::StringPrintf("--dirty-image-objects-fd=%d",
                                                      args.dirtyImageObjectsFd));
   }

   if (args.dexPaths.size() != args.dexFds.size()) {
     return Errorf("Mismatched number of dexPaths (%d) and dexFds (%d)",
                   args.dexPaths.size(),
                   args.dexFds.size());
   }
   for (unsigned int i = 0; i < args.dexPaths.size(); ++i) {
     cmdline.emplace_back("--dex-file=" + args.dexPaths[i]);
     cmdline.emplace_back(android::base::StringPrintf("--dex-fd=%d", args.dexFds[i]));
   }

   std::string bcp_env = GetDex2oatBootClasspath();
   auto result = AddBootClasspath(cmdline, bcp_env, args.bootClasspaths, args.bootClasspathFds);
   if (!result.ok()) {
     return result.error();
   }

   cmdline.emplace_back("--oat-location=" + args.oatLocation);

   // Output files
   if (args.imageFd < 0) {
     return Error() << "imageFd is missing";
   }
   cmdline.emplace_back(android::base::StringPrintf("--image-fd=%d", args.imageFd));
   if (args.vdexFd < 0) {
     return Error() << "vdexFd is missing";
   }
   cmdline.emplace_back(android::base::StringPrintf("--output-vdex-fd=%d", args.vdexFd));
   if (args.oatFd < 0) {
     return Error() << "oatFd is missing";
   }
   cmdline.emplace_back(android::base::StringPrintf("--oat-fd=%d", args.oatFd));

   AddDex2OatConcurrencyArguments(cmdline, args.threads, args.cpuSet);

   return {};
 }

 Result<void> AddDex2oatArgsFromSystemServerArgs(const DexoptSystemServerArgs& args,
                                                 /*out*/ std::vector<std::string>& cmdline) {
   cmdline.emplace_back("--dex-file=" + args.dexPath);
   cmdline.emplace_back(android::base::StringPrintf("--dex-fd=%d", args.dexFd));

   // Common dex2oat flags
   AddDex2OatCommonOptions(cmdline);
   AddDex2OatDebugInfo(cmdline);

   cmdline.emplace_back("--instruction-set=" + ToInstructionSetString(args.isa));

   if (args.compilerFilter == CompilerFilter::SPEED_PROFILE) {
     if (args.profileFd < 0) {
       return Error() << "profileFd is missing";
     }
     cmdline.emplace_back(android::base::StringPrintf("--profile-file-fd=%d", args.profileFd));
     cmdline.emplace_back("--compiler-filter=speed-profile");
   } else {
     cmdline.emplace_back("--compiler-filter=" +
                          std::string(CompilerFilterAidlToString(args.compilerFilter)));
   }

   // Output files
   if (args.imageFd < 0) {
     return Error() << "imageFd is missing";
   }
   cmdline.emplace_back(android::base::StringPrintf("--app-image-fd=%d", args.imageFd));
   if (args.vdexFd < 0) {
     return Error() << "vdexFd is missing";
   }
   cmdline.emplace_back(android::base::StringPrintf("--output-vdex-fd=%d", args.vdexFd));
   if (args.oatFd < 0) {
     return Error() << "oatFd is missing";
   }
   cmdline.emplace_back(android::base::StringPrintf("--oat-fd=%d", args.oatFd));
   cmdline.emplace_back("--oat-location=" + args.oatLocation);

   std::string bcp_env = GetBootClasspath();
   auto result = AddBootClasspath(cmdline, bcp_env, args.bootClasspaths, args.bootClasspathFds);
   if (!result.ok()) {
     return result.error();
   }
   result = AddCompiledBootClasspathFdsIfAny(cmdline, args);
   if (!result.ok()) {
     return result.error();
   }

   if (args.classloaderFds.empty()) {
     cmdline.emplace_back("--class-loader-context=PCL[]");
   } else {
     const std::string context_path = android::base::Join(args.classloaderContext, ':');
     if (args.classloaderContextAsParent) {
       cmdline.emplace_back("--class-loader-context=PCL[];PCL[" + context_path + "]");
     } else {
       cmdline.emplace_back("--class-loader-context=PCL[" + context_path + "]");
     }
     cmdline.emplace_back("--class-loader-context-fds=" +
                          android::base::Join(args.classloaderFds, ':'));
   }

   cmdline.emplace_back("--boot-image=" + args.bootImage);

   AddDex2OatConcurrencyArguments(cmdline, args.threads, args.cpuSet);

   return {};
 }

 }  // namespace art
	/*
	* Copyright (C) 2021 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 "libdexopt.h"
	#define LOG_TAG "libdexopt"

	#include <map>
	#include <string>
	#include <vector>

	#include "android-base/stringprintf.h"
	#include "android-base/strings.h"
	#include "android-base/result.h"
	#include "base/file_utils.h"
	#include "log/log.h"

	#include "aidl/com/android/art/CompilerFilter.h"
	#include "aidl/com/android/art/DexoptBcpExtArgs.h"
	#include "aidl/com/android/art/DexoptSystemServerArgs.h"
	#include "aidl/com/android/art/Isa.h"

	namespace art {

	namespace {

	using aidl::com::android::art::CompilerFilter;
	using aidl::com::android::art::DexoptBcpExtArgs;
	using aidl::com::android::art::DexoptSystemServerArgs;
	using aidl::com::android::art::Isa;
	using android::base::Error;
	using android::base::Result;

	std::string GetEnvironmentVariableOrDie(const char* name) {
	const char* value = getenv(name);
	LOG_ALWAYS_FATAL_IF(value == nullptr, "%s is not defined.", name);
	return value;
	}

	std::string GetDex2oatBootClasspath() {
	return GetEnvironmentVariableOrDie("DEX2OATBOOTCLASSPATH");
	}

	std::string GetBootClasspath() {
	return GetEnvironmentVariableOrDie("BOOTCLASSPATH");
	}

	std::string ToInstructionSetString(Isa isa) {
	switch (isa) {
	case Isa::ARM:
	case Isa::THUMB2:
	return "arm";
	case Isa::ARM64:
	return "arm64";
	case Isa::X86:
	return "x86";
	case Isa::X86_64:
	return "x86_64";
	default:
	UNREACHABLE();
	}
	}

	const char* CompilerFilterAidlToString(CompilerFilter compiler_filter) {
	switch (compiler_filter) {
	case CompilerFilter::SPEED_PROFILE:
	return "speed-profile";
	case CompilerFilter::SPEED:
	return"speed";
	case CompilerFilter::VERIFY:
	return "verify";
	default:
	UNREACHABLE();
	}
	}

	Result<void> AddBootClasspath(/inout/ std::vector<std::string>& cmdline,
	const std::string& bootclasspath_env,
	const std::vector<std::string>& boot_classpaths,
	const std::vector<int>& boot_classpath_fds) {
	if (boot_classpaths.empty()) {
	return Errorf("Missing BCP files");
	}

	if (boot_classpaths.size() != boot_classpath_fds.size()) {
	return Errorf("Number of BCP paths (%d) != number of FDs (%d)", boot_classpaths.size(),
	boot_classpath_fds.size());
	}

	cmdline.emplace_back("--runtime-arg");
	cmdline.emplace_back("-Xbootclasspath:" + bootclasspath_env);

	// Construct a path->fd map from both arrays. If the client provides duplicated paths, only one
	// will be used. This is fine since the client may not be trusted any way.
	std::map<std::string, int> bcp_map;
	auto zip = [](const std::string &path, int fd) { return std::make_pair(path, fd); };
	std::transform(boot_classpaths.begin(), boot_classpaths.end(), boot_classpath_fds.begin(),
	std::inserter(bcp_map, bcp_map.end()), zip);

	std::vector<std::string> jar_paths = android::base::Split(bootclasspath_env, ":");
	std::stringstream ss;
	ss << "-Xbootclasspathfds";
	for (auto& jar_path : jar_paths) {
	auto iter = bcp_map.find(jar_path);
	if (iter == bcp_map.end()) {
	ss << ":-1";
	} else {
	ss << ":" << std::to_string(iter->second);
	bcp_map.erase(iter);
	}
	}
	cmdline.emplace_back("--runtime-arg");
	cmdline.emplace_back(ss.str());

	if (!bcp_map.empty()) {
	std::stringstream error_ss;
	for (const auto &[key, _] : bcp_map) {
	error_ss << key << ":";
	}
	return Error() << "Residual BCP paths: " << error_ss.str();
	}
	return {};
	}

	Result<void> AddCompiledBootClasspathFdsIfAny(/inout/ std::vector<std::string>& cmdline,
	const DexoptSystemServerArgs& args) {
	// Result
	if ((args.bootClasspathImageFds.size() != args.bootClasspathOatFds.size()) \|\|
	(args.bootClasspathImageFds.size() != args.bootClasspathVdexFds.size()) \|\|
	(args.bootClasspathImageFds.size() != args.bootClasspaths.size())) {
	return Errorf("Inconsistent FD numbers of BCP artifacts: jar/image/vdex/oat: %d/%d/%d/%d",
	args.bootClasspaths.size(), args.bootClasspathImageFds.size(),
	args.bootClasspathVdexFds.size(), args.bootClasspathOatFds.size());
	}

	if (!args.bootClasspathImageFds.empty()) {
	cmdline.emplace_back("--runtime-arg");
	cmdline.emplace_back(
	"-Xbootclasspathimagefds:" + android::base::Join(args.bootClasspathImageFds, ':'));
	cmdline.emplace_back("--runtime-arg");
	cmdline.emplace_back(
	"-Xbootclasspathoatfds:" + android::base::Join(args.bootClasspathOatFds, ':'));
	cmdline.emplace_back("--runtime-arg");
	cmdline.emplace_back(
	"-Xbootclasspathvdexfds:" + android::base::Join(args.bootClasspathVdexFds, ':'));
	}
	return {};
	}

	void AddDex2OatConcurrencyArguments(/inout/ std::vector<std::string>& cmdline,
	int threads,
	const std::vector<int>& cpu_set) {
	if (threads > 0) {
	cmdline.emplace_back(android::base::StringPrintf("-j%d", threads));
	}
	if (!cpu_set.empty()) {
	cmdline.emplace_back("--cpu-set=" + android::base::Join(cpu_set, ','));
	}
	}

	void AddDex2OatCommonOptions(/inout/ std::vector<std::string>& cmdline) {
	cmdline.emplace_back("--android-root=out/empty");
	cmdline.emplace_back("--abort-on-hard-verifier-error");
	cmdline.emplace_back("--no-abort-on-soft-verifier-error");
	cmdline.emplace_back("--compilation-reason=boot");
	cmdline.emplace_back("--image-format=lz4");
	cmdline.emplace_back("--force-determinism");
	cmdline.emplace_back("--resolve-startup-const-strings=true");

	// Avoid storing dex2oat cmdline in oat header. We want to be sure that the compiled artifacts
	// are identical regardless of where the compilation happened. But some of the cmdline flags tends
	// to be unstable, e.g. those contains FD numbers. To avoid the problem, the whole cmdline is not
	// added to the oat header.
	cmdline.emplace_back("--avoid-storing-invocation");
	}

	void AddDex2OatDebugInfo(/inout/ std::vector<std::string>& cmdline) {
	cmdline.emplace_back("--generate-mini-debug-info");
	cmdline.emplace_back("--strip");
	}

	} // namespace

	Result<void> AddDex2oatArgsFromBcpExtensionArgs(const DexoptBcpExtArgs& args,
	/out/ std::vector<std::string>& cmdline) {
	// Common dex2oat flags
	AddDex2OatCommonOptions(cmdline);
	AddDex2OatDebugInfo(cmdline);

	cmdline.emplace_back("--instruction-set=" + ToInstructionSetString(args.isa));

	if (!args.profileFds.empty()) {
	for (int fd : args.profileFds) {
	cmdline.emplace_back(android::base::StringPrintf("--profile-file-fd=%d", fd));
	}
	cmdline.emplace_back("--compiler-filter=speed-profile");
	} else {
	cmdline.emplace_back("--compiler-filter=speed");
	}

	// Compile as a single image for fewer files and slightly less memory overhead.
	cmdline.emplace_back("--single-image");

	cmdline.emplace_back(android::base::StringPrintf("--base=0x%08x", ART_BASE_ADDRESS));

	if (args.dirtyImageObjectsFd >= 0) {
	cmdline.emplace_back(android::base::StringPrintf("--dirty-image-objects-fd=%d",
	args.dirtyImageObjectsFd));
	}

	if (args.dexPaths.size() != args.dexFds.size()) {
	return Errorf("Mismatched number of dexPaths (%d) and dexFds (%d)",
	args.dexPaths.size(),
	args.dexFds.size());
	}
	for (unsigned int i = 0; i < args.dexPaths.size(); ++i) {
	cmdline.emplace_back("--dex-file=" + args.dexPaths[i]);
	cmdline.emplace_back(android::base::StringPrintf("--dex-fd=%d", args.dexFds[i]));
	}

	std::string bcp_env = GetDex2oatBootClasspath();
	auto result = AddBootClasspath(cmdline, bcp_env, args.bootClasspaths, args.bootClasspathFds);
	if (!result.ok()) {
	return result.error();
	}

	cmdline.emplace_back("--oat-location=" + args.oatLocation);

	// Output files
	if (args.imageFd < 0) {
	return Error() << "imageFd is missing";
	}
	cmdline.emplace_back(android::base::StringPrintf("--image-fd=%d", args.imageFd));
	if (args.vdexFd < 0) {
	return Error() << "vdexFd is missing";
	}
	cmdline.emplace_back(android::base::StringPrintf("--output-vdex-fd=%d", args.vdexFd));
	if (args.oatFd < 0) {
	return Error() << "oatFd is missing";
	}
	cmdline.emplace_back(android::base::StringPrintf("--oat-fd=%d", args.oatFd));

	AddDex2OatConcurrencyArguments(cmdline, args.threads, args.cpuSet);

	return {};
	}

	Result<void> AddDex2oatArgsFromSystemServerArgs(const DexoptSystemServerArgs& args,
	/out/ std::vector<std::string>& cmdline) {
	cmdline.emplace_back("--dex-file=" + args.dexPath);
	cmdline.emplace_back(android::base::StringPrintf("--dex-fd=%d", args.dexFd));

	// Common dex2oat flags
	AddDex2OatCommonOptions(cmdline);
	AddDex2OatDebugInfo(cmdline);

	cmdline.emplace_back("--instruction-set=" + ToInstructionSetString(args.isa));

	if (args.compilerFilter == CompilerFilter::SPEED_PROFILE) {
	if (args.profileFd < 0) {
	return Error() << "profileFd is missing";
	}
	cmdline.emplace_back(android::base::StringPrintf("--profile-file-fd=%d", args.profileFd));
	cmdline.emplace_back("--compiler-filter=speed-profile");
	} else {
	cmdline.emplace_back("--compiler-filter=" +
	std::string(CompilerFilterAidlToString(args.compilerFilter)));
	}

	// Output files
	if (args.imageFd < 0) {
	return Error() << "imageFd is missing";
	}
	cmdline.emplace_back(android::base::StringPrintf("--app-image-fd=%d", args.imageFd));
	if (args.vdexFd < 0) {
	return Error() << "vdexFd is missing";
	}
	cmdline.emplace_back(android::base::StringPrintf("--output-vdex-fd=%d", args.vdexFd));
	if (args.oatFd < 0) {
	return Error() << "oatFd is missing";
	}
	cmdline.emplace_back(android::base::StringPrintf("--oat-fd=%d", args.oatFd));
	cmdline.emplace_back("--oat-location=" + args.oatLocation);

	std::string bcp_env = GetBootClasspath();
	auto result = AddBootClasspath(cmdline, bcp_env, args.bootClasspaths, args.bootClasspathFds);
	if (!result.ok()) {
	return result.error();
	}
	result = AddCompiledBootClasspathFdsIfAny(cmdline, args);
	if (!result.ok()) {
	return result.error();
	}

	if (args.classloaderFds.empty()) {
	cmdline.emplace_back("--class-loader-context=PCL[]");
	} else {
	const std::string context_path = android::base::Join(args.classloaderContext, ':');
	if (args.classloaderContextAsParent) {
	cmdline.emplace_back("--class-loader-context=PCL[];PCL[" + context_path + "]");
	} else {
	cmdline.emplace_back("--class-loader-context=PCL[" + context_path + "]");
	}
	cmdline.emplace_back("--class-loader-context-fds=" +
	android::base::Join(args.classloaderFds, ':'));
	}

	cmdline.emplace_back("--boot-image=" + args.bootImage);

	AddDex2OatConcurrencyArguments(cmdline, args.threads, args.cpuSet);

	return {};
	}

	} // namespace art