cmds/installd/run_dex2oat.cpp - third_party/android/platform/frameworks/native - Git at Google

 /*
  * Copyright (C) 2020 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.
  */
 #define LOG_TAG "installd"

 #include "run_dex2oat.h"

 #include <memory>
 #include <string>
 #include <vector>

 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/properties.h>
 #include <android-base/scopeguard.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <log/log.h>
 #include <server_configurable_flags/get_flags.h>

 #include "unique_file.h"

 using android::base::Basename;
 using android::base::StringPrintf;

 namespace android {
 namespace installd {

 namespace {

 // Should minidebug info be included in compiled artifacts? Even if this value is
 // "true," usage might still be conditional to other constraints, e.g., system
 // property overrides.
 static constexpr bool kEnableMinidebugInfo = true;

 static constexpr const char* kMinidebugInfoSystemProperty = "dalvik.vm.dex2oat-minidebuginfo";
 static constexpr bool kMinidebugInfoSystemPropertyDefault = false;
 static constexpr const char* kMinidebugDex2oatFlag = "--generate-mini-debug-info";
 static constexpr const char* kDisableCompactDexFlag = "--compact-dex-level=none";

 // Location of the JIT Zygote image.
 static const char* kJitZygoteImage =
     "boot.art:/nonx/boot-framework.art!/system/etc/boot-image.prof";

 std::vector<std::string> SplitBySpaces(const std::string& str) {
     if (str.empty()) {
         return {};
     }
     return android::base::Split(str, " ");
 }

 }  // namespace

 RunDex2Oat::RunDex2Oat(const char* dex2oat_bin, ExecVHelper* execv_helper)
   : dex2oat_bin_(dex2oat_bin), execv_helper_(execv_helper) {}

 void RunDex2Oat::Initialize(const UniqueFile& output_oat,
                             const UniqueFile& output_vdex,
                             const UniqueFile& output_image,
                             const UniqueFile& input_dex,
                             const UniqueFile& input_vdex,
                             const UniqueFile& dex_metadata,
                             const UniqueFile& profile,
                             const char* class_loader_context,
                             const std::string& class_loader_context_fds,
                             int swap_fd,
                             const char* instruction_set,
                             const char* compiler_filter,
                             bool debuggable,
                             bool post_bootcomplete,
                             bool for_restore,
                             int target_sdk_version,
                             bool enable_hidden_api_checks,
                             bool generate_compact_dex,
                             bool use_jitzygote_image,
                             const char* compilation_reason) {
     PrepareBootImageFlags(use_jitzygote_image);

     PrepareInputFileFlags(output_oat, output_vdex, output_image, input_dex, input_vdex,
                           dex_metadata, profile, swap_fd, class_loader_context,
                           class_loader_context_fds);

     PrepareCompilerConfigFlags(input_vdex, output_vdex, instruction_set, compiler_filter,
                                debuggable, target_sdk_version, enable_hidden_api_checks,
                                generate_compact_dex, compilation_reason);

     PrepareCompilerRuntimeAndPerfConfigFlags(post_bootcomplete, for_restore);

     const std::string dex2oat_flags = GetProperty("dalvik.vm.dex2oat-flags", "");
     std::vector<std::string> dex2oat_flags_args = SplitBySpaces(dex2oat_flags);
     ALOGV("dalvik.vm.dex2oat-flags=%s\n", dex2oat_flags.c_str());

     // Do not add args after dex2oat_flags, they should override others for debugging.
     for (auto it = dex2oat_flags_args.begin(); it != dex2oat_flags_args.end(); ++it) {
         AddArg(*it);
     }

     execv_helper_->PrepareArgs(dex2oat_bin_);
 }

 RunDex2Oat::~RunDex2Oat() {}

 void RunDex2Oat::PrepareBootImageFlags(bool use_jitzygote_image) {
     std::string boot_image;
     if (use_jitzygote_image) {
         boot_image = StringPrintf("--boot-image=%s", kJitZygoteImage);
     } else {
         boot_image = MapPropertyToArg("dalvik.vm.boot-image", "--boot-image=%s");
     }
     AddArg(boot_image);
 }

 void RunDex2Oat::PrepareInputFileFlags(const UniqueFile& output_oat,
                                        const UniqueFile& output_vdex,
                                        const UniqueFile& output_image,
                                        const UniqueFile& input_dex,
                                        const UniqueFile& input_vdex,
                                        const UniqueFile& dex_metadata,
                                        const UniqueFile& profile,
                                        int swap_fd,
                                        const char* class_loader_context,
                                        const std::string& class_loader_context_fds) {
     std::string input_basename = Basename(input_dex.path());
     LOG(VERBOSE) << "Running " << dex2oat_bin_ << " in=" << input_basename << " out="
                  << output_oat.path();

     AddArg(StringPrintf("--zip-fd=%d", input_dex.fd()));
     AddArg(StringPrintf("--zip-location=%s", input_basename.c_str()));
     AddArg(StringPrintf("--oat-fd=%d", output_oat.fd()));
     AddArg(StringPrintf("--oat-location=%s", output_oat.path().c_str()));
     AddArg(StringPrintf("--input-vdex-fd=%d", input_vdex.fd()));
     AddArg(StringPrintf("--output-vdex-fd=%d", output_vdex.fd()));

     if (output_image.fd() >= 0) {
         AddArg(StringPrintf("--app-image-fd=%d", output_image.fd()));
         AddArg(MapPropertyToArg("dalvik.vm.appimageformat", "--image-format=%s"));
     }
     if (dex_metadata.fd() > -1) {
         AddArg("--dm-fd=" + std::to_string(dex_metadata.fd()));
     }
     if (profile.fd() != -1) {
         AddArg(StringPrintf("--profile-file-fd=%d", profile.fd()));
     }
     if (swap_fd >= 0) {
         AddArg(StringPrintf("--swap-fd=%d", swap_fd));
     }

     // Get the directory of the apk to pass as a base classpath directory.
     {
         std::string apk_dir(input_dex.path());
         size_t dir_index = apk_dir.rfind('/');
         if (dir_index != std::string::npos) {
             apk_dir = apk_dir.substr(0, dir_index);
             AddArg(StringPrintf("--classpath-dir=%s", apk_dir.c_str()));
         }
     }

     if (class_loader_context != nullptr) {
         AddArg(StringPrintf("--class-loader-context=%s", class_loader_context));
         if (!class_loader_context_fds.empty()) {
             AddArg(StringPrintf("--class-loader-context-fds=%s",
                                 class_loader_context_fds.c_str()));
         }
     }
 }

 void RunDex2Oat::PrepareCompilerConfigFlags(const UniqueFile& input_vdex,
                                             const UniqueFile& output_vdex,
                                             const char* instruction_set,
                                             const char* compiler_filter,
                                             bool debuggable,
                                             int target_sdk_version,
                                             bool enable_hidden_api_checks,
                                             bool generate_compact_dex,
                                             const char* compilation_reason) {
     // Disable cdex if update input vdex is true since this combination of options is not
     // supported.
     const bool disable_cdex = !generate_compact_dex || (input_vdex.fd() == output_vdex.fd());
     if (disable_cdex) {
         AddArg(kDisableCompactDexFlag);
     }

     // ISA related
     {
         AddArg(StringPrintf("--instruction-set=%s", instruction_set));

         const std::string dex2oat_isa_features_key =
                 StringPrintf("dalvik.vm.isa.%s.features", instruction_set);
         std::string instruction_set_features_arg =
                 MapPropertyToArg(dex2oat_isa_features_key, "--instruction-set-features=%s");
         AddArg(instruction_set_features_arg);

         const std::string dex2oat_isa_variant_key =
                 StringPrintf("dalvik.vm.isa.%s.variant", instruction_set);
         std::string instruction_set_variant_arg =
                 MapPropertyToArg(dex2oat_isa_variant_key, "--instruction-set-variant=%s");
         AddArg(instruction_set_variant_arg);
     }

     // Compute compiler filter.
     {
         std::string dex2oat_compiler_filter_arg;
         {
             // If we are booting without the real /data, don't spend time compiling.
             std::string vold_decrypt = GetProperty("vold.decrypt", "");
             bool skip_compilation = vold_decrypt == "trigger_restart_min_framework" ||
                     vold_decrypt == "1";

             bool have_dex2oat_relocation_skip_flag = false;
             if (skip_compilation) {
                 dex2oat_compiler_filter_arg = "--compiler-filter=extract";
                 have_dex2oat_relocation_skip_flag = true;
             } else if (compiler_filter != nullptr) {
                 dex2oat_compiler_filter_arg = StringPrintf("--compiler-filter=%s",
                                                            compiler_filter);
             }
             if (have_dex2oat_relocation_skip_flag) {
                 AddRuntimeArg("-Xnorelocate");
             }
         }

         if (dex2oat_compiler_filter_arg.empty()) {
             dex2oat_compiler_filter_arg = MapPropertyToArg("dalvik.vm.dex2oat-filter",
                                                            "--compiler-filter=%s");
         }
         AddArg(dex2oat_compiler_filter_arg);

         if (compilation_reason != nullptr) {
             AddArg(std::string("--compilation-reason=") + compilation_reason);
         }
     }

     AddArg(MapPropertyToArg("dalvik.vm.dex2oat-max-image-block-size",
                             "--max-image-block-size=%s"));

     AddArg(MapPropertyToArg("dalvik.vm.dex2oat-very-large",
                             "--very-large-app-threshold=%s"));

     std::string resolve_startup_string_arg = MapPropertyToArg(
         "persist.device_config.runtime.dex2oat_resolve_startup_strings",
         "--resolve-startup-const-strings=%s");
     if (resolve_startup_string_arg.empty()) {
         // If empty, fall back to system property.
         resolve_startup_string_arg =
                 MapPropertyToArg("dalvik.vm.dex2oat-resolve-startup-strings",
                                  "--resolve-startup-const-strings=%s");
     }
     AddArg(resolve_startup_string_arg);

     // Debug related
     {
         // Check whether all apps should be compiled debuggable.
         if (!debuggable) {
             debuggable = GetProperty("dalvik.vm.always_debuggable", "") == "1";
         }
         if (debuggable) {
             AddArg("--debuggable");
         }

         const bool generate_debug_info = GetBoolProperty("debug.generate-debug-info", false);
         if (generate_debug_info) {
             AddArg("--generate-debug-info");
         }
         {
             bool generate_minidebug_info = kEnableMinidebugInfo &&
                     GetBoolProperty(kMinidebugInfoSystemProperty,
                                     kMinidebugInfoSystemPropertyDefault);
             if (generate_minidebug_info) {
                 AddArg(kMinidebugDex2oatFlag);
             }
         }
     }

     // On-device signing related. odsign sets the system property odsign.verification.success if
     // AOT artifacts have the expected signatures.
     const bool trust_art_apex_data_files = GetBoolProperty("odsign.verification.success", false);
     if (!trust_art_apex_data_files) {
         AddRuntimeArg("-Xdeny-art-apex-data-files");
     }

     if (target_sdk_version != 0) {
         AddRuntimeArg(StringPrintf("-Xtarget-sdk-version:%d", target_sdk_version));
     }

     if (enable_hidden_api_checks) {
         AddRuntimeArg("-Xhidden-api-policy:enabled");
     }
 }

 void RunDex2Oat::PrepareCompilerRuntimeAndPerfConfigFlags(bool post_bootcomplete,
                                                           bool for_restore) {
     // CPU set
     {
         std::string cpu_set_format = "--cpu-set=%s";
         std::string dex2oat_cpu_set_arg = post_bootcomplete
                 ? (for_restore
                    ? MapPropertyToArgWithBackup(
                            "dalvik.vm.restore-dex2oat-cpu-set",
                            "dalvik.vm.dex2oat-cpu-set",
                            cpu_set_format)
                    : MapPropertyToArg("dalvik.vm.dex2oat-cpu-set", cpu_set_format))
                 : MapPropertyToArg("dalvik.vm.boot-dex2oat-cpu-set", cpu_set_format);
         AddArg(dex2oat_cpu_set_arg);
     }

     // Number of threads
     {
         std::string threads_format = "-j%s";
         std::string dex2oat_threads_arg = post_bootcomplete
                 ? (for_restore
                    ? MapPropertyToArgWithBackup(
                            "dalvik.vm.restore-dex2oat-threads",
                            "dalvik.vm.dex2oat-threads",
                            threads_format)
                    : MapPropertyToArg("dalvik.vm.dex2oat-threads", threads_format))
                 : MapPropertyToArg("dalvik.vm.boot-dex2oat-threads", threads_format);
         AddArg(dex2oat_threads_arg);
     }

     AddRuntimeArg(MapPropertyToArg("dalvik.vm.dex2oat-Xms", "-Xms%s"));
     AddRuntimeArg(MapPropertyToArg("dalvik.vm.dex2oat-Xmx", "-Xmx%s"));

     // Enable compiling dex files in isolation on low ram devices.
     // It takes longer but reduces the memory footprint.
     if (GetBoolProperty("ro.config.low_ram", false)) {
       AddArg("--compile-individually");
     }
 }

 void RunDex2Oat::Exec(int exit_code) {
     execv_helper_->Exec(exit_code);
 }

 void RunDex2Oat::AddArg(const std::string& arg) {
     execv_helper_->AddArg(arg);
 }

 void RunDex2Oat::AddRuntimeArg(const std::string& arg) {
     execv_helper_->AddRuntimeArg(arg);
 }

 std::string RunDex2Oat::GetProperty(const std::string& key,
                                     const std::string& default_value) {
     return android::base::GetProperty(key, default_value);
 }

 bool RunDex2Oat::GetBoolProperty(const std::string& key, bool default_value) {
     return android::base::GetBoolProperty(key, default_value);
 }

 std::string RunDex2Oat::MapPropertyToArg(const std::string& property,
                                          const std::string& format,
                                          const std::string& default_value) {
     std::string prop = GetProperty(property, default_value);
     if (!prop.empty()) {
         return StringPrintf(format.c_str(), prop.c_str());
     }
     return "";
 }

 std::string RunDex2Oat::MapPropertyToArgWithBackup(
         const std::string& property,
         const std::string& backupProperty,
         const std::string& format,
         const std::string& default_value) {
     std::string value = GetProperty(property, default_value);
     if (!value.empty()) {
         return StringPrintf(format.c_str(), value.c_str());
     }
     return MapPropertyToArg(backupProperty, format, default_value);
 }

 }  // namespace installd
 }  // namespace android
	/*
	* Copyright (C) 2020 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.
	*/
	#define LOG_TAG "installd"

	#include "run_dex2oat.h"

	#include <memory>
	#include <string>
	#include <vector>

	#include <android-base/file.h>
	#include <android-base/logging.h>
	#include <android-base/properties.h>
	#include <android-base/scopeguard.h>
	#include <android-base/stringprintf.h>
	#include <android-base/strings.h>
	#include <log/log.h>
	#include <server_configurable_flags/get_flags.h>

	#include "unique_file.h"

	using android::base::Basename;
	using android::base::StringPrintf;

	namespace android {
	namespace installd {

	namespace {

	// Should minidebug info be included in compiled artifacts? Even if this value is
	// "true," usage might still be conditional to other constraints, e.g., system
	// property overrides.
	static constexpr bool kEnableMinidebugInfo = true;

	static constexpr const char* kMinidebugInfoSystemProperty = "dalvik.vm.dex2oat-minidebuginfo";
	static constexpr bool kMinidebugInfoSystemPropertyDefault = false;
	static constexpr const char* kMinidebugDex2oatFlag = "--generate-mini-debug-info";
	static constexpr const char* kDisableCompactDexFlag = "--compact-dex-level=none";

	// Location of the JIT Zygote image.
	static const char* kJitZygoteImage =
	"boot.art:/nonx/boot-framework.art!/system/etc/boot-image.prof";

	std::vector<std::string> SplitBySpaces(const std::string& str) {
	if (str.empty()) {
	return {};
	}
	return android::base::Split(str, " ");
	}

	} // namespace

	RunDex2Oat::RunDex2Oat(const char* dex2oat_bin, ExecVHelper* execv_helper)
	: dex2oat_bin_(dex2oat_bin), execv_helper_(execv_helper) {}

	void RunDex2Oat::Initialize(const UniqueFile& output_oat,
	const UniqueFile& output_vdex,
	const UniqueFile& output_image,
	const UniqueFile& input_dex,
	const UniqueFile& input_vdex,
	const UniqueFile& dex_metadata,
	const UniqueFile& profile,
	const char* class_loader_context,
	const std::string& class_loader_context_fds,
	int swap_fd,
	const char* instruction_set,
	const char* compiler_filter,
	bool debuggable,
	bool post_bootcomplete,
	bool for_restore,
	int target_sdk_version,
	bool enable_hidden_api_checks,
	bool generate_compact_dex,
	bool use_jitzygote_image,
	const char* compilation_reason) {
	PrepareBootImageFlags(use_jitzygote_image);

	PrepareInputFileFlags(output_oat, output_vdex, output_image, input_dex, input_vdex,
	dex_metadata, profile, swap_fd, class_loader_context,
	class_loader_context_fds);

	PrepareCompilerConfigFlags(input_vdex, output_vdex, instruction_set, compiler_filter,
	debuggable, target_sdk_version, enable_hidden_api_checks,
	generate_compact_dex, compilation_reason);

	PrepareCompilerRuntimeAndPerfConfigFlags(post_bootcomplete, for_restore);

	const std::string dex2oat_flags = GetProperty("dalvik.vm.dex2oat-flags", "");
	std::vector<std::string> dex2oat_flags_args = SplitBySpaces(dex2oat_flags);
	ALOGV("dalvik.vm.dex2oat-flags=%s\n", dex2oat_flags.c_str());

	// Do not add args after dex2oat_flags, they should override others for debugging.
	for (auto it = dex2oat_flags_args.begin(); it != dex2oat_flags_args.end(); ++it) {
	AddArg(*it);
	}

	execv_helper_->PrepareArgs(dex2oat_bin_);
	}

	RunDex2Oat::~RunDex2Oat() {}

	void RunDex2Oat::PrepareBootImageFlags(bool use_jitzygote_image) {
	std::string boot_image;
	if (use_jitzygote_image) {
	boot_image = StringPrintf("--boot-image=%s", kJitZygoteImage);
	} else {
	boot_image = MapPropertyToArg("dalvik.vm.boot-image", "--boot-image=%s");
	}
	AddArg(boot_image);
	}

	void RunDex2Oat::PrepareInputFileFlags(const UniqueFile& output_oat,
	const UniqueFile& output_vdex,
	const UniqueFile& output_image,
	const UniqueFile& input_dex,
	const UniqueFile& input_vdex,
	const UniqueFile& dex_metadata,
	const UniqueFile& profile,
	int swap_fd,
	const char* class_loader_context,
	const std::string& class_loader_context_fds) {
	std::string input_basename = Basename(input_dex.path());
	LOG(VERBOSE) << "Running " << dex2oat_bin_ << " in=" << input_basename << " out="
	<< output_oat.path();

	AddArg(StringPrintf("--zip-fd=%d", input_dex.fd()));
	AddArg(StringPrintf("--zip-location=%s", input_basename.c_str()));
	AddArg(StringPrintf("--oat-fd=%d", output_oat.fd()));
	AddArg(StringPrintf("--oat-location=%s", output_oat.path().c_str()));
	AddArg(StringPrintf("--input-vdex-fd=%d", input_vdex.fd()));
	AddArg(StringPrintf("--output-vdex-fd=%d", output_vdex.fd()));

	if (output_image.fd() >= 0) {
	AddArg(StringPrintf("--app-image-fd=%d", output_image.fd()));
	AddArg(MapPropertyToArg("dalvik.vm.appimageformat", "--image-format=%s"));
	}
	if (dex_metadata.fd() > -1) {
	AddArg("--dm-fd=" + std::to_string(dex_metadata.fd()));
	}
	if (profile.fd() != -1) {
	AddArg(StringPrintf("--profile-file-fd=%d", profile.fd()));
	}
	if (swap_fd >= 0) {
	AddArg(StringPrintf("--swap-fd=%d", swap_fd));
	}

	// Get the directory of the apk to pass as a base classpath directory.
	{
	std::string apk_dir(input_dex.path());
	size_t dir_index = apk_dir.rfind('/');
	if (dir_index != std::string::npos) {
	apk_dir = apk_dir.substr(0, dir_index);
	AddArg(StringPrintf("--classpath-dir=%s", apk_dir.c_str()));
	}
	}

	if (class_loader_context != nullptr) {
	AddArg(StringPrintf("--class-loader-context=%s", class_loader_context));
	if (!class_loader_context_fds.empty()) {
	AddArg(StringPrintf("--class-loader-context-fds=%s",
	class_loader_context_fds.c_str()));
	}
	}
	}

	void RunDex2Oat::PrepareCompilerConfigFlags(const UniqueFile& input_vdex,
	const UniqueFile& output_vdex,
	const char* instruction_set,
	const char* compiler_filter,
	bool debuggable,
	int target_sdk_version,
	bool enable_hidden_api_checks,
	bool generate_compact_dex,
	const char* compilation_reason) {
	// Disable cdex if update input vdex is true since this combination of options is not
	// supported.
	const bool disable_cdex = !generate_compact_dex \|\| (input_vdex.fd() == output_vdex.fd());
	if (disable_cdex) {
	AddArg(kDisableCompactDexFlag);
	}

	// ISA related
	{
	AddArg(StringPrintf("--instruction-set=%s", instruction_set));

	const std::string dex2oat_isa_features_key =
	StringPrintf("dalvik.vm.isa.%s.features", instruction_set);
	std::string instruction_set_features_arg =
	MapPropertyToArg(dex2oat_isa_features_key, "--instruction-set-features=%s");
	AddArg(instruction_set_features_arg);

	const std::string dex2oat_isa_variant_key =
	StringPrintf("dalvik.vm.isa.%s.variant", instruction_set);
	std::string instruction_set_variant_arg =
	MapPropertyToArg(dex2oat_isa_variant_key, "--instruction-set-variant=%s");
	AddArg(instruction_set_variant_arg);
	}

	// Compute compiler filter.
	{
	std::string dex2oat_compiler_filter_arg;
	{
	// If we are booting without the real /data, don't spend time compiling.
	std::string vold_decrypt = GetProperty("vold.decrypt", "");
	bool skip_compilation = vold_decrypt == "trigger_restart_min_framework" \|\|
	vold_decrypt == "1";

	bool have_dex2oat_relocation_skip_flag = false;
	if (skip_compilation) {
	dex2oat_compiler_filter_arg = "--compiler-filter=extract";
	have_dex2oat_relocation_skip_flag = true;
	} else if (compiler_filter != nullptr) {
	dex2oat_compiler_filter_arg = StringPrintf("--compiler-filter=%s",
	compiler_filter);
	}
	if (have_dex2oat_relocation_skip_flag) {
	AddRuntimeArg("-Xnorelocate");
	}
	}

	if (dex2oat_compiler_filter_arg.empty()) {
	dex2oat_compiler_filter_arg = MapPropertyToArg("dalvik.vm.dex2oat-filter",
	"--compiler-filter=%s");
	}
	AddArg(dex2oat_compiler_filter_arg);

	if (compilation_reason != nullptr) {
	AddArg(std::string("--compilation-reason=") + compilation_reason);
	}
	}

	AddArg(MapPropertyToArg("dalvik.vm.dex2oat-max-image-block-size",
	"--max-image-block-size=%s"));

	AddArg(MapPropertyToArg("dalvik.vm.dex2oat-very-large",
	"--very-large-app-threshold=%s"));

	std::string resolve_startup_string_arg = MapPropertyToArg(
	"persist.device_config.runtime.dex2oat_resolve_startup_strings",
	"--resolve-startup-const-strings=%s");
	if (resolve_startup_string_arg.empty()) {
	// If empty, fall back to system property.
	resolve_startup_string_arg =
	MapPropertyToArg("dalvik.vm.dex2oat-resolve-startup-strings",
	"--resolve-startup-const-strings=%s");
	}
	AddArg(resolve_startup_string_arg);

	// Debug related
	{
	// Check whether all apps should be compiled debuggable.
	if (!debuggable) {
	debuggable = GetProperty("dalvik.vm.always_debuggable", "") == "1";
	}
	if (debuggable) {
	AddArg("--debuggable");
	}

	const bool generate_debug_info = GetBoolProperty("debug.generate-debug-info", false);
	if (generate_debug_info) {
	AddArg("--generate-debug-info");
	}
	{
	bool generate_minidebug_info = kEnableMinidebugInfo &&
	GetBoolProperty(kMinidebugInfoSystemProperty,
	kMinidebugInfoSystemPropertyDefault);
	if (generate_minidebug_info) {
	AddArg(kMinidebugDex2oatFlag);
	}
	}
	}

	// On-device signing related. odsign sets the system property odsign.verification.success if
	// AOT artifacts have the expected signatures.
	const bool trust_art_apex_data_files = GetBoolProperty("odsign.verification.success", false);
	if (!trust_art_apex_data_files) {
	AddRuntimeArg("-Xdeny-art-apex-data-files");
	}

	if (target_sdk_version != 0) {
	AddRuntimeArg(StringPrintf("-Xtarget-sdk-version:%d", target_sdk_version));
	}

	if (enable_hidden_api_checks) {
	AddRuntimeArg("-Xhidden-api-policy:enabled");
	}
	}

	void RunDex2Oat::PrepareCompilerRuntimeAndPerfConfigFlags(bool post_bootcomplete,
	bool for_restore) {
	// CPU set
	{
	std::string cpu_set_format = "--cpu-set=%s";
	std::string dex2oat_cpu_set_arg = post_bootcomplete
	? (for_restore
	? MapPropertyToArgWithBackup(
	"dalvik.vm.restore-dex2oat-cpu-set",
	"dalvik.vm.dex2oat-cpu-set",
	cpu_set_format)
	: MapPropertyToArg("dalvik.vm.dex2oat-cpu-set", cpu_set_format))
	: MapPropertyToArg("dalvik.vm.boot-dex2oat-cpu-set", cpu_set_format);
	AddArg(dex2oat_cpu_set_arg);
	}

	// Number of threads
	{
	std::string threads_format = "-j%s";
	std::string dex2oat_threads_arg = post_bootcomplete
	? (for_restore
	? MapPropertyToArgWithBackup(
	"dalvik.vm.restore-dex2oat-threads",
	"dalvik.vm.dex2oat-threads",
	threads_format)
	: MapPropertyToArg("dalvik.vm.dex2oat-threads", threads_format))
	: MapPropertyToArg("dalvik.vm.boot-dex2oat-threads", threads_format);
	AddArg(dex2oat_threads_arg);
	}

	AddRuntimeArg(MapPropertyToArg("dalvik.vm.dex2oat-Xms", "-Xms%s"));
	AddRuntimeArg(MapPropertyToArg("dalvik.vm.dex2oat-Xmx", "-Xmx%s"));

	// Enable compiling dex files in isolation on low ram devices.
	// It takes longer but reduces the memory footprint.
	if (GetBoolProperty("ro.config.low_ram", false)) {
	AddArg("--compile-individually");
	}
	}

	void RunDex2Oat::Exec(int exit_code) {
	execv_helper_->Exec(exit_code);
	}

	void RunDex2Oat::AddArg(const std::string& arg) {
	execv_helper_->AddArg(arg);
	}

	void RunDex2Oat::AddRuntimeArg(const std::string& arg) {
	execv_helper_->AddRuntimeArg(arg);
	}

	std::string RunDex2Oat::GetProperty(const std::string& key,
	const std::string& default_value) {
	return android::base::GetProperty(key, default_value);
	}

	bool RunDex2Oat::GetBoolProperty(const std::string& key, bool default_value) {
	return android::base::GetBoolProperty(key, default_value);
	}

	std::string RunDex2Oat::MapPropertyToArg(const std::string& property,
	const std::string& format,
	const std::string& default_value) {
	std::string prop = GetProperty(property, default_value);
	if (!prop.empty()) {
	return StringPrintf(format.c_str(), prop.c_str());
	}
	return "";
	}

	std::string RunDex2Oat::MapPropertyToArgWithBackup(
	const std::string& property,
	const std::string& backupProperty,
	const std::string& format,
	const std::string& default_value) {
	std::string value = GetProperty(property, default_value);
	if (!value.empty()) {
	return StringPrintf(format.c_str(), value.c_str());
	}
	return MapPropertyToArg(backupProperty, format, default_value);
	}

	} // namespace installd
	} // namespace android