libartbase/base/common_art_test.cc - platform/art - Gitiles

 /*
  * Copyright (C) 2012 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 "common_art_test.h"

 #include <dirent.h>
 #include <dlfcn.h>
 #include <fcntl.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <cstdio>
 #include <filesystem>
 #include "android-base/file.h"
 #include "android-base/logging.h"
 #include "nativehelper/scoped_local_ref.h"

 #include "android-base/stringprintf.h"
 #include "android-base/strings.h"
 #include "android-base/unique_fd.h"

 #include "art_field-inl.h"
 #include "base/file_utils.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/mem_map.h"
 #include "base/mutex.h"
 #include "base/os.h"
 #include "base/runtime_debug.h"
 #include "base/stl_util.h"
 #include "base/unix_file/fd_file.h"
 #include "dex/art_dex_file_loader.h"
 #include "dex/dex_file-inl.h"
 #include "dex/dex_file_loader.h"
 #include "dex/primitive.h"
 #include "gtest/gtest.h"

 namespace art {

 using android::base::StringPrintf;

 ScratchFile::ScratchFile() {
   // ANDROID_DATA needs to be set
   CHECK_NE(static_cast<char*>(nullptr), getenv("ANDROID_DATA")) <<
       "Are you subclassing RuntimeTest?";
   filename_ = getenv("ANDROID_DATA");
   filename_ += "/TmpFile-XXXXXX";
   int fd = mkstemp(&filename_[0]);
   CHECK_NE(-1, fd) << strerror(errno) << " for " << filename_;
   file_.reset(new File(fd, GetFilename(), true));
 }

 ScratchFile::ScratchFile(const ScratchFile& other, const char* suffix)
     : ScratchFile(other.GetFilename() + suffix) {}

 ScratchFile::ScratchFile(const std::string& filename) : filename_(filename) {
   int fd = open(filename_.c_str(), O_RDWR | O_CREAT | O_CLOEXEC, 0666);
   CHECK_NE(-1, fd);
   file_.reset(new File(fd, GetFilename(), true));
 }

 ScratchFile::ScratchFile(File* file) {
   CHECK(file != nullptr);
   filename_ = file->GetPath();
   file_.reset(file);
 }

 ScratchFile::ScratchFile(ScratchFile&& other) noexcept {
   *this = std::move(other);
 }

 ScratchFile& ScratchFile::operator=(ScratchFile&& other) noexcept {
   if (GetFile() != other.GetFile()) {
     std::swap(filename_, other.filename_);
     std::swap(file_, other.file_);
   }
   return *this;
 }

 ScratchFile::~ScratchFile() {
   Unlink();
 }

 int ScratchFile::GetFd() const {
   return file_->Fd();
 }

 void ScratchFile::Close() {
   if (file_.get() != nullptr) {
     if (file_->FlushCloseOrErase() != 0) {
       PLOG(WARNING) << "Error closing scratch file.";
     }
   }
 }

 void ScratchFile::Unlink() {
   if (!OS::FileExists(filename_.c_str())) {
     return;
   }
   Close();
   int unlink_result = unlink(filename_.c_str());
   CHECK_EQ(0, unlink_result);
 }

 void CommonArtTestImpl::SetUpAndroidRootEnvVars() {
   if (IsHost()) {
     // Make sure that ANDROID_BUILD_TOP is set. If not, set it from CWD.
     const char* android_build_top_from_env = getenv("ANDROID_BUILD_TOP");
     if (android_build_top_from_env == nullptr) {
       // Not set by build server, so default to current directory.
       char* cwd = getcwd(nullptr, 0);
       setenv("ANDROID_BUILD_TOP", cwd, 1);
       free(cwd);
       android_build_top_from_env = getenv("ANDROID_BUILD_TOP");
     }

     const char* android_host_out_from_env = getenv("ANDROID_HOST_OUT");
     if (android_host_out_from_env == nullptr) {
       // Not set by build server, so default to the usual value of
       // ANDROID_HOST_OUT.
       std::string android_host_out;
 #if defined(__linux__)
       // Fallback
       android_host_out = std::string(android_build_top_from_env) + "/out/host/linux-x86";
       // Look at how we were invoked
       std::string argv;
       if (android::base::ReadFileToString("/proc/self/cmdline", &argv)) {
         // /proc/self/cmdline is the programs 'argv' with elements delimited by '\0'.
         std::string cmdpath(argv.substr(0, argv.find('\0')));
         std::filesystem::path path(cmdpath);
         // If the path is relative then prepend the android_build_top_from_env to it
         if (path.is_relative()) {
           path = std::filesystem::path(android_build_top_from_env).append(cmdpath);
           DCHECK(path.is_absolute()) << path;
         }
         // Walk up until we find the linux-x86 directory or we hit the root directory.
         while (path.has_parent_path() && path.parent_path() != path &&
                path.filename() != std::filesystem::path("linux-x86")) {
           path = path.parent_path();
         }
         // If we found a linux-x86 directory path is now android_host_out
         if (path.filename() == std::filesystem::path("linux-x86")) {
           android_host_out = path.string();
         }
       }
 #elif defined(__APPLE__)
       android_host_out = std::string(android_build_top_from_env) + "/out/host/darwin-x86";
 #else
 #error unsupported OS
 #endif
       setenv("ANDROID_HOST_OUT", android_host_out.c_str(), 1);
       android_host_out_from_env = getenv("ANDROID_HOST_OUT");
     }

     // Environment variable ANDROID_ROOT is set on the device, but not
     // necessarily on the host.
     const char* android_root_from_env = getenv("ANDROID_ROOT");
     if (android_root_from_env == nullptr) {
       // Use ANDROID_HOST_OUT for ANDROID_ROOT.
       setenv("ANDROID_ROOT", android_host_out_from_env, 1);
       android_root_from_env = getenv("ANDROID_ROOT");
     }

     // Environment variable ANDROID_I18N_ROOT is set on the device, but not
     // necessarily on the host. It needs to be set so that various libraries
     // like libcore / icu4j / icu4c can find their data files.
     const char* android_i18n_root_from_env = getenv("ANDROID_I18N_ROOT");
     if (android_i18n_root_from_env == nullptr) {
       // Use ${ANDROID_I18N_OUT}/com.android.i18n for ANDROID_I18N_ROOT.
       std::string android_i18n_root = android_host_out_from_env;
       android_i18n_root += "/com.android.i18n";
       setenv("ANDROID_I18N_ROOT", android_i18n_root.c_str(), 1);
     }

     // Environment variable ANDROID_RUNTIME_ROOT is set on the device, but not
     // necessarily on the host. It needs to be set so that various libraries
     // like libcore / icu4j / icu4c can find their data files.
     const char* android_runtime_root_from_env = getenv("ANDROID_RUNTIME_ROOT");
     if (android_runtime_root_from_env == nullptr) {
       // Use ${ANDROID_HOST_OUT}/com.android.art for ANDROID_RUNTIME_ROOT.
       std::string android_runtime_root = android_host_out_from_env;
       android_runtime_root += "/com.android.art";
       setenv("ANDROID_RUNTIME_ROOT", android_runtime_root.c_str(), 1);
     }

     // Environment variable ANDROID_TZDATA_ROOT is set on the device, but not
     // necessarily on the host. It needs to be set so that various libraries
     // like libcore / icu4j / icu4c can find their data files.
     const char* android_tzdata_root_from_env = getenv("ANDROID_TZDATA_ROOT");
     if (android_tzdata_root_from_env == nullptr) {
       // Use ${ANDROID_HOST_OUT}/com.android.tzdata for ANDROID_TZDATA_ROOT.
       std::string android_tzdata_root = android_host_out_from_env;
       android_tzdata_root += "/com.android.tzdata";
       setenv("ANDROID_TZDATA_ROOT", android_tzdata_root.c_str(), 1);
     }

     setenv("LD_LIBRARY_PATH", ":", 0);  // Required by java.lang.System.<clinit>.
   }
 }

 void CommonArtTestImpl::SetUpAndroidDataDir(std::string& android_data) {
   // On target, Cannot use /mnt/sdcard because it is mounted noexec, so use subdir of dalvik-cache
   if (IsHost()) {
     const char* tmpdir = getenv("TMPDIR");
     if (tmpdir != nullptr && tmpdir[0] != 0) {
       android_data = tmpdir;
     } else {
       android_data = "/tmp";
     }
   } else {
     android_data = "/data/dalvik-cache";
   }
   android_data += "/art-data-XXXXXX";
   if (mkdtemp(&android_data[0]) == nullptr) {
     PLOG(FATAL) << "mkdtemp(\"" << &android_data[0] << "\") failed";
   }
   setenv("ANDROID_DATA", android_data.c_str(), 1);
 }

 void CommonArtTestImpl::SetUp() {
   SetUpAndroidRootEnvVars();
   SetUpAndroidDataDir(android_data_);
   dalvik_cache_.append(android_data_.c_str());
   dalvik_cache_.append("/dalvik-cache");
   int mkdir_result = mkdir(dalvik_cache_.c_str(), 0700);
   ASSERT_EQ(mkdir_result, 0);

   static bool gSlowDebugTestFlag = false;
   RegisterRuntimeDebugFlag(&gSlowDebugTestFlag);
   SetRuntimeDebugFlagsEnabled(true);
   CHECK(gSlowDebugTestFlag);
 }

 void CommonArtTestImpl::TearDownAndroidDataDir(const std::string& android_data,
                                                bool fail_on_error) {
   if (fail_on_error) {
     ASSERT_EQ(rmdir(android_data.c_str()), 0);
   } else {
     rmdir(android_data.c_str());
   }
 }

 // Helper - find directory with the following format:
 // ${ANDROID_BUILD_TOP}/${subdir1}/${subdir2}-${version}/${subdir3}/bin/
 std::string CommonArtTestImpl::GetAndroidToolsDir(const std::string& subdir1,
                                                   const std::string& subdir2,
                                                   const std::string& subdir3) {
   std::string root;
   const char* android_build_top = getenv("ANDROID_BUILD_TOP");
   if (android_build_top != nullptr) {
     root = android_build_top;
   } else {
     // Not set by build server, so default to current directory
     char* cwd = getcwd(nullptr, 0);
     setenv("ANDROID_BUILD_TOP", cwd, 1);
     root = cwd;
     free(cwd);
   }

   std::string toolsdir = root + "/" + subdir1;
   std::string founddir;
   DIR* dir;
   if ((dir = opendir(toolsdir.c_str())) != nullptr) {
     float maxversion = 0;
     struct dirent* entry;
     while ((entry = readdir(dir)) != nullptr) {
       std::string format = subdir2 + "-%f";
       float version;
       if (std::sscanf(entry->d_name, format.c_str(), &version) == 1) {
         if (version > maxversion) {
           maxversion = version;
           founddir = toolsdir + "/" + entry->d_name + "/" + subdir3 + "/bin/";
         }
       }
     }
     closedir(dir);
   }

   if (founddir.empty()) {
     ADD_FAILURE() << "Cannot find Android tools directory.";
   }
   return founddir;
 }

 std::string CommonArtTestImpl::GetAndroidHostToolsDir() {
   return GetAndroidToolsDir("prebuilts/gcc/linux-x86/host",
                             "x86_64-linux-glibc2.17",
                             "x86_64-linux");
 }

 std::string CommonArtTestImpl::GetCoreArtLocation() {
   return GetCoreFileLocation("art");
 }

 std::string CommonArtTestImpl::GetCoreOatLocation() {
   return GetCoreFileLocation("oat");
 }

 std::unique_ptr<const DexFile> CommonArtTestImpl::LoadExpectSingleDexFile(const char* location) {
   std::vector<std::unique_ptr<const DexFile>> dex_files;
   std::string error_msg;
   MemMap::Init();
   static constexpr bool kVerifyChecksum = true;
   const ArtDexFileLoader dex_file_loader;
   if (!dex_file_loader.Open(
         location, location, /* verify= */ true, kVerifyChecksum, &error_msg, &dex_files)) {
     LOG(FATAL) << "Could not open .dex file '" << location << "': " << error_msg << "\n";
     UNREACHABLE();
   } else {
     CHECK_EQ(1U, dex_files.size()) << "Expected only one dex file in " << location;
     return std::move(dex_files[0]);
   }
 }

 void CommonArtTestImpl::ClearDirectory(const char* dirpath, bool recursive) {
   ASSERT_TRUE(dirpath != nullptr);
   DIR* dir = opendir(dirpath);
   ASSERT_TRUE(dir != nullptr);
   dirent* e;
   struct stat s;
   while ((e = readdir(dir)) != nullptr) {
     if ((strcmp(e->d_name, ".") == 0) || (strcmp(e->d_name, "..") == 0)) {
       continue;
     }
     std::string filename(dirpath);
     filename.push_back('/');
     filename.append(e->d_name);
     int stat_result = lstat(filename.c_str(), &s);
     ASSERT_EQ(0, stat_result) << "unable to stat " << filename;
     if (S_ISDIR(s.st_mode)) {
       if (recursive) {
         ClearDirectory(filename.c_str());
         int rmdir_result = rmdir(filename.c_str());
         ASSERT_EQ(0, rmdir_result) << filename;
       }
     } else {
       int unlink_result = unlink(filename.c_str());
       ASSERT_EQ(0, unlink_result) << filename;
     }
   }
   closedir(dir);
 }

 void CommonArtTestImpl::TearDown() {
   const char* android_data = getenv("ANDROID_DATA");
   ASSERT_TRUE(android_data != nullptr);
   ClearDirectory(dalvik_cache_.c_str());
   int rmdir_cache_result = rmdir(dalvik_cache_.c_str());
   ASSERT_EQ(0, rmdir_cache_result);
   TearDownAndroidDataDir(android_data_, true);
   dalvik_cache_.clear();
 }

 static std::string GetDexFileName(const std::string& jar_prefix, bool host) {
   std::string path = GetAndroidRoot();

   std::string suffix = host
       ? "-hostdex"                 // The host version.
       : "-testdex";                // The unstripped target version.

   return StringPrintf("%s/framework/%s%s.jar", path.c_str(), jar_prefix.c_str(), suffix.c_str());
 }

 std::vector<std::string> CommonArtTestImpl::GetLibCoreModuleNames() const {
   // Note: This must start with the CORE_IMG_JARS in Android.common_path.mk
   // because that's what we use for compiling the core.art image.
   // It may contain additional modules from TEST_CORE_JARS.
   return {
       // CORE_IMG_JARS modules.
       "core-oj",
       "core-libart",
       "core-icu4j",
       "okhttp",
       "bouncycastle",
       "apache-xml",
       // Additional modules.
       "conscrypt",
   };
 }

 std::vector<std::string> CommonArtTestImpl::GetLibCoreDexFileNames(
     const std::vector<std::string>& modules) const {
   std::vector<std::string> result;
   result.reserve(modules.size());
   for (const std::string& module : modules) {
     result.push_back(GetDexFileName(module, IsHost()));
   }
   return result;
 }

 std::vector<std::string> CommonArtTestImpl::GetLibCoreDexFileNames() const {
   std::vector<std::string> modules = GetLibCoreModuleNames();
   return GetLibCoreDexFileNames(modules);
 }

 std::vector<std::string> CommonArtTestImpl::GetLibCoreDexLocations(
     const std::vector<std::string>& modules) const {
   std::vector<std::string> result = GetLibCoreDexFileNames(modules);
   if (IsHost()) {
     // Strip the ANDROID_BUILD_TOP directory including the directory separator '/'.
     const char* host_dir = getenv("ANDROID_BUILD_TOP");
     CHECK(host_dir != nullptr);
     std::string prefix = host_dir;
     CHECK(!prefix.empty());
     if (prefix.back() != '/') {
       prefix += '/';
     }
     for (std::string& location : result) {
       CHECK_GT(location.size(), prefix.size());
       CHECK_EQ(location.compare(0u, prefix.size(), prefix), 0);
       location.erase(0u, prefix.size());
     }
   }
   return result;
 }

 std::vector<std::string> CommonArtTestImpl::GetLibCoreDexLocations() const {
   std::vector<std::string> modules = GetLibCoreModuleNames();
   return GetLibCoreDexLocations(modules);
 }

 std::string CommonArtTestImpl::GetClassPathOption(const char* option,
                                                   const std::vector<std::string>& class_path) {
   return option + android::base::Join(class_path, ':');
 }

 // Check that for target builds we have ART_TARGET_NATIVETEST_DIR set.
 #ifdef ART_TARGET
 #ifndef ART_TARGET_NATIVETEST_DIR
 #error "ART_TARGET_NATIVETEST_DIR not set."
 #endif
 // Wrap it as a string literal.
 #define ART_TARGET_NATIVETEST_DIR_STRING STRINGIFY(ART_TARGET_NATIVETEST_DIR) "/"
 #else
 #define ART_TARGET_NATIVETEST_DIR_STRING ""
 #endif

 std::string CommonArtTestImpl::GetTestDexFileName(const char* name) const {
   CHECK(name != nullptr);
   std::string filename;
   if (IsHost()) {
     filename += GetAndroidRoot() + "/framework/";
   } else {
     filename += ART_TARGET_NATIVETEST_DIR_STRING;
   }
   filename += "art-gtest-";
   filename += name;
   filename += ".jar";
   return filename;
 }

 std::vector<std::unique_ptr<const DexFile>> CommonArtTestImpl::OpenDexFiles(const char* filename) {
   static constexpr bool kVerify = true;
   static constexpr bool kVerifyChecksum = true;
   std::string error_msg;
   const ArtDexFileLoader dex_file_loader;
   std::vector<std::unique_ptr<const DexFile>> dex_files;
   bool success = dex_file_loader.Open(filename,
                                       filename,
                                       kVerify,
                                       kVerifyChecksum,
                                       &error_msg,
                                       &dex_files);
   CHECK(success) << "Failed to open '" << filename << "': " << error_msg;
   for (auto& dex_file : dex_files) {
     CHECK_EQ(PROT_READ, dex_file->GetPermissions());
     CHECK(dex_file->IsReadOnly());
   }
   return dex_files;
 }

 std::unique_ptr<const DexFile> CommonArtTestImpl::OpenDexFile(const char* filename) {
   std::vector<std::unique_ptr<const DexFile>> dex_files(OpenDexFiles(filename));
   CHECK_EQ(dex_files.size(), 1u) << "Expected only one dex file";
   return std::move(dex_files[0]);
 }

 std::vector<std::unique_ptr<const DexFile>> CommonArtTestImpl::OpenTestDexFiles(
     const char* name) {
   return OpenDexFiles(GetTestDexFileName(name).c_str());
 }

 std::unique_ptr<const DexFile> CommonArtTestImpl::OpenTestDexFile(const char* name) {
   return OpenDexFile(GetTestDexFileName(name).c_str());
 }

 std::string CommonArtTestImpl::GetCoreFileLocation(const char* suffix) {
   CHECK(suffix != nullptr);

   std::string location;
   if (IsHost()) {
     std::string host_dir = GetAndroidRoot();
     location = StringPrintf("%s/framework/core.%s", host_dir.c_str(), suffix);
   } else {
     location = StringPrintf("/data/art-test/core.%s", suffix);
   }

   return location;
 }

 std::string CommonArtTestImpl::CreateClassPath(
     const std::vector<std::unique_ptr<const DexFile>>& dex_files) {
   CHECK(!dex_files.empty());
   std::string classpath = dex_files[0]->GetLocation();
   for (size_t i = 1; i < dex_files.size(); i++) {
     classpath += ":" + dex_files[i]->GetLocation();
   }
   return classpath;
 }

 std::string CommonArtTestImpl::CreateClassPathWithChecksums(
     const std::vector<std::unique_ptr<const DexFile>>& dex_files) {
   CHECK(!dex_files.empty());
   std::string classpath = dex_files[0]->GetLocation() + "*" +
       std::to_string(dex_files[0]->GetLocationChecksum());
   for (size_t i = 1; i < dex_files.size(); i++) {
     classpath += ":" + dex_files[i]->GetLocation() + "*" +
         std::to_string(dex_files[i]->GetLocationChecksum());
   }
   return classpath;
 }

 CommonArtTestImpl::ForkAndExecResult CommonArtTestImpl::ForkAndExec(
     const std::vector<std::string>& argv,
     const PostForkFn& post_fork,
     const OutputHandlerFn& handler) {
   ForkAndExecResult result;
   result.status_code = 0;
   result.stage = ForkAndExecResult::kLink;

   std::vector<const char*> c_args;
   for (const std::string& str : argv) {
     c_args.push_back(str.c_str());
   }
   c_args.push_back(nullptr);

   android::base::unique_fd link[2];
   {
     int link_fd[2];

     if (pipe(link_fd) == -1) {
       return result;
     }
     link[0].reset(link_fd[0]);
     link[1].reset(link_fd[1]);
   }

   result.stage = ForkAndExecResult::kFork;

   pid_t pid = fork();
   if (pid == -1) {
     return result;
   }

   if (pid == 0) {
     if (!post_fork()) {
       LOG(ERROR) << "Failed post-fork function";
       exit(1);
       UNREACHABLE();
     }

     // Redirect stdout and stderr.
     dup2(link[1].get(), STDOUT_FILENO);
     dup2(link[1].get(), STDERR_FILENO);

     link[0].reset();
     link[1].reset();

     execv(c_args[0], const_cast<char* const*>(c_args.data()));
     exit(1);
     UNREACHABLE();
   }

   result.stage = ForkAndExecResult::kWaitpid;
   link[1].reset();

   char buffer[128] = { 0 };
   ssize_t bytes_read = 0;
   while (TEMP_FAILURE_RETRY(bytes_read = read(link[0].get(), buffer, 128)) > 0) {
     handler(buffer, bytes_read);
   }
   handler(buffer, 0u);  // End with a virtual write of zero length to simplify clients.

   link[0].reset();

   if (waitpid(pid, &result.status_code, 0) == -1) {
     return result;
   }

   result.stage = ForkAndExecResult::kFinished;
   return result;
 }

 CommonArtTestImpl::ForkAndExecResult CommonArtTestImpl::ForkAndExec(
     const std::vector<std::string>& argv, const PostForkFn& post_fork, std::string* output) {
   auto string_collect_fn = [output](char* buf, size_t len) {
     *output += std::string(buf, len);
   };
   return ForkAndExec(argv, post_fork, string_collect_fn);
 }

 }  // namespace art
	/*
	* Copyright (C) 2012 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 "common_art_test.h"

	#include <dirent.h>
	#include <dlfcn.h>
	#include <fcntl.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <cstdio>
	#include <filesystem>
	#include "android-base/file.h"
	#include "android-base/logging.h"
	#include "nativehelper/scoped_local_ref.h"

	#include "android-base/stringprintf.h"
	#include "android-base/strings.h"
	#include "android-base/unique_fd.h"

	#include "art_field-inl.h"
	#include "base/file_utils.h"
	#include "base/logging.h"
	#include "base/macros.h"
	#include "base/mem_map.h"
	#include "base/mutex.h"
	#include "base/os.h"
	#include "base/runtime_debug.h"
	#include "base/stl_util.h"
	#include "base/unix_file/fd_file.h"
	#include "dex/art_dex_file_loader.h"
	#include "dex/dex_file-inl.h"
	#include "dex/dex_file_loader.h"
	#include "dex/primitive.h"
	#include "gtest/gtest.h"

	namespace art {

	using android::base::StringPrintf;

	ScratchFile::ScratchFile() {
	// ANDROID_DATA needs to be set
	CHECK_NE(static_cast<char*>(nullptr), getenv("ANDROID_DATA")) <<
	"Are you subclassing RuntimeTest?";
	filename_ = getenv("ANDROID_DATA");
	filename_ += "/TmpFile-XXXXXX";
	int fd = mkstemp(&filename_[0]);
	CHECK_NE(-1, fd) << strerror(errno) << " for " << filename_;
	file_.reset(new File(fd, GetFilename(), true));
	}

	ScratchFile::ScratchFile(const ScratchFile& other, const char* suffix)
	: ScratchFile(other.GetFilename() + suffix) {}

	ScratchFile::ScratchFile(const std::string& filename) : filename_(filename) {
	int fd = open(filename_.c_str(), O_RDWR \| O_CREAT \| O_CLOEXEC, 0666);
	CHECK_NE(-1, fd);
	file_.reset(new File(fd, GetFilename(), true));
	}

	ScratchFile::ScratchFile(File* file) {
	CHECK(file != nullptr);
	filename_ = file->GetPath();
	file_.reset(file);
	}

	ScratchFile::ScratchFile(ScratchFile&& other) noexcept {
	*this = std::move(other);
	}

	ScratchFile& ScratchFile::operator=(ScratchFile&& other) noexcept {
	if (GetFile() != other.GetFile()) {
	std::swap(filename_, other.filename_);
	std::swap(file_, other.file_);
	}
	return *this;
	}

	ScratchFile::~ScratchFile() {
	Unlink();
	}

	int ScratchFile::GetFd() const {
	return file_->Fd();
	}

	void ScratchFile::Close() {
	if (file_.get() != nullptr) {
	if (file_->FlushCloseOrErase() != 0) {
	PLOG(WARNING) << "Error closing scratch file.";
	}
	}
	}

	void ScratchFile::Unlink() {
	if (!OS::FileExists(filename_.c_str())) {
	return;
	}
	Close();
	int unlink_result = unlink(filename_.c_str());
	CHECK_EQ(0, unlink_result);
	}

	void CommonArtTestImpl::SetUpAndroidRootEnvVars() {
	if (IsHost()) {
	// Make sure that ANDROID_BUILD_TOP is set. If not, set it from CWD.
	const char* android_build_top_from_env = getenv("ANDROID_BUILD_TOP");
	if (android_build_top_from_env == nullptr) {
	// Not set by build server, so default to current directory.
	char* cwd = getcwd(nullptr, 0);
	setenv("ANDROID_BUILD_TOP", cwd, 1);
	free(cwd);
	android_build_top_from_env = getenv("ANDROID_BUILD_TOP");
	}

	const char* android_host_out_from_env = getenv("ANDROID_HOST_OUT");
	if (android_host_out_from_env == nullptr) {
	// Not set by build server, so default to the usual value of
	// ANDROID_HOST_OUT.
	std::string android_host_out;
	#if defined(__linux__)
	// Fallback
	android_host_out = std::string(android_build_top_from_env) + "/out/host/linux-x86";
	// Look at how we were invoked
	std::string argv;
	if (android::base::ReadFileToString("/proc/self/cmdline", &argv)) {
	// /proc/self/cmdline is the programs 'argv' with elements delimited by '\0'.
	std::string cmdpath(argv.substr(0, argv.find('\0')));
	std::filesystem::path path(cmdpath);
	// If the path is relative then prepend the android_build_top_from_env to it
	if (path.is_relative()) {
	path = std::filesystem::path(android_build_top_from_env).append(cmdpath);
	DCHECK(path.is_absolute()) << path;
	}
	// Walk up until we find the linux-x86 directory or we hit the root directory.
	while (path.has_parent_path() && path.parent_path() != path &&
	path.filename() != std::filesystem::path("linux-x86")) {
	path = path.parent_path();
	}
	// If we found a linux-x86 directory path is now android_host_out
	if (path.filename() == std::filesystem::path("linux-x86")) {
	android_host_out = path.string();
	}
	}
	#elif defined(__APPLE__)
	android_host_out = std::string(android_build_top_from_env) + "/out/host/darwin-x86";
	#else
	#error unsupported OS
	#endif
	setenv("ANDROID_HOST_OUT", android_host_out.c_str(), 1);
	android_host_out_from_env = getenv("ANDROID_HOST_OUT");
	}

	// Environment variable ANDROID_ROOT is set on the device, but not
	// necessarily on the host.
	const char* android_root_from_env = getenv("ANDROID_ROOT");
	if (android_root_from_env == nullptr) {
	// Use ANDROID_HOST_OUT for ANDROID_ROOT.
	setenv("ANDROID_ROOT", android_host_out_from_env, 1);
	android_root_from_env = getenv("ANDROID_ROOT");
	}

	// Environment variable ANDROID_I18N_ROOT is set on the device, but not
	// necessarily on the host. It needs to be set so that various libraries
	// like libcore / icu4j / icu4c can find their data files.
	const char* android_i18n_root_from_env = getenv("ANDROID_I18N_ROOT");
	if (android_i18n_root_from_env == nullptr) {
	// Use ${ANDROID_I18N_OUT}/com.android.i18n for ANDROID_I18N_ROOT.
	std::string android_i18n_root = android_host_out_from_env;
	android_i18n_root += "/com.android.i18n";
	setenv("ANDROID_I18N_ROOT", android_i18n_root.c_str(), 1);
	}

	// Environment variable ANDROID_RUNTIME_ROOT is set on the device, but not
	// necessarily on the host. It needs to be set so that various libraries
	// like libcore / icu4j / icu4c can find their data files.
	const char* android_runtime_root_from_env = getenv("ANDROID_RUNTIME_ROOT");
	if (android_runtime_root_from_env == nullptr) {
	// Use ${ANDROID_HOST_OUT}/com.android.art for ANDROID_RUNTIME_ROOT.
	std::string android_runtime_root = android_host_out_from_env;
	android_runtime_root += "/com.android.art";
	setenv("ANDROID_RUNTIME_ROOT", android_runtime_root.c_str(), 1);
	}

	// Environment variable ANDROID_TZDATA_ROOT is set on the device, but not
	// necessarily on the host. It needs to be set so that various libraries
	// like libcore / icu4j / icu4c can find their data files.
	const char* android_tzdata_root_from_env = getenv("ANDROID_TZDATA_ROOT");
	if (android_tzdata_root_from_env == nullptr) {
	// Use ${ANDROID_HOST_OUT}/com.android.tzdata for ANDROID_TZDATA_ROOT.
	std::string android_tzdata_root = android_host_out_from_env;
	android_tzdata_root += "/com.android.tzdata";
	setenv("ANDROID_TZDATA_ROOT", android_tzdata_root.c_str(), 1);
	}

	setenv("LD_LIBRARY_PATH", ":", 0); // Required by java.lang.System.<clinit>.
	}
	}

	void CommonArtTestImpl::SetUpAndroidDataDir(std::string& android_data) {
	// On target, Cannot use /mnt/sdcard because it is mounted noexec, so use subdir of dalvik-cache
	if (IsHost()) {
	const char* tmpdir = getenv("TMPDIR");
	if (tmpdir != nullptr && tmpdir[0] != 0) {
	android_data = tmpdir;
	} else {
	android_data = "/tmp";
	}
	} else {
	android_data = "/data/dalvik-cache";
	}
	android_data += "/art-data-XXXXXX";
	if (mkdtemp(&android_data[0]) == nullptr) {
	PLOG(FATAL) << "mkdtemp(\"" << &android_data[0] << "\") failed";
	}
	setenv("ANDROID_DATA", android_data.c_str(), 1);
	}

	void CommonArtTestImpl::SetUp() {
	SetUpAndroidRootEnvVars();
	SetUpAndroidDataDir(android_data_);
	dalvik_cache_.append(android_data_.c_str());
	dalvik_cache_.append("/dalvik-cache");
	int mkdir_result = mkdir(dalvik_cache_.c_str(), 0700);
	ASSERT_EQ(mkdir_result, 0);

	static bool gSlowDebugTestFlag = false;
	RegisterRuntimeDebugFlag(&gSlowDebugTestFlag);
	SetRuntimeDebugFlagsEnabled(true);
	CHECK(gSlowDebugTestFlag);
	}

	void CommonArtTestImpl::TearDownAndroidDataDir(const std::string& android_data,
	bool fail_on_error) {
	if (fail_on_error) {
	ASSERT_EQ(rmdir(android_data.c_str()), 0);
	} else {
	rmdir(android_data.c_str());
	}
	}

	// Helper - find directory with the following format:
	// ${ANDROID_BUILD_TOP}/${subdir1}/${subdir2}-${version}/${subdir3}/bin/
	std::string CommonArtTestImpl::GetAndroidToolsDir(const std::string& subdir1,
	const std::string& subdir2,
	const std::string& subdir3) {
	std::string root;
	const char* android_build_top = getenv("ANDROID_BUILD_TOP");
	if (android_build_top != nullptr) {
	root = android_build_top;
	} else {
	// Not set by build server, so default to current directory
	char* cwd = getcwd(nullptr, 0);
	setenv("ANDROID_BUILD_TOP", cwd, 1);
	root = cwd;
	free(cwd);
	}

	std::string toolsdir = root + "/" + subdir1;
	std::string founddir;
	DIR* dir;
	if ((dir = opendir(toolsdir.c_str())) != nullptr) {
	float maxversion = 0;
	struct dirent* entry;
	while ((entry = readdir(dir)) != nullptr) {
	std::string format = subdir2 + "-%f";
	float version;
	if (std::sscanf(entry->d_name, format.c_str(), &version) == 1) {
	if (version > maxversion) {
	maxversion = version;
	founddir = toolsdir + "/" + entry->d_name + "/" + subdir3 + "/bin/";
	}
	}
	}
	closedir(dir);
	}

	if (founddir.empty()) {
	ADD_FAILURE() << "Cannot find Android tools directory.";
	}
	return founddir;
	}

	std::string CommonArtTestImpl::GetAndroidHostToolsDir() {
	return GetAndroidToolsDir("prebuilts/gcc/linux-x86/host",
	"x86_64-linux-glibc2.17",
	"x86_64-linux");
	}

	std::string CommonArtTestImpl::GetCoreArtLocation() {
	return GetCoreFileLocation("art");
	}

	std::string CommonArtTestImpl::GetCoreOatLocation() {
	return GetCoreFileLocation("oat");
	}

	std::unique_ptr<const DexFile> CommonArtTestImpl::LoadExpectSingleDexFile(const char* location) {
	std::vector<std::unique_ptr<const DexFile>> dex_files;
	std::string error_msg;
	MemMap::Init();
	static constexpr bool kVerifyChecksum = true;
	const ArtDexFileLoader dex_file_loader;
	if (!dex_file_loader.Open(
	location, location, /* verify= */ true, kVerifyChecksum, &error_msg, &dex_files)) {
	LOG(FATAL) << "Could not open .dex file '" << location << "': " << error_msg << "\n";
	UNREACHABLE();
	} else {
	CHECK_EQ(1U, dex_files.size()) << "Expected only one dex file in " << location;
	return std::move(dex_files[0]);
	}
	}

	void CommonArtTestImpl::ClearDirectory(const char* dirpath, bool recursive) {
	ASSERT_TRUE(dirpath != nullptr);
	DIR* dir = opendir(dirpath);
	ASSERT_TRUE(dir != nullptr);
	dirent* e;
	struct stat s;
	while ((e = readdir(dir)) != nullptr) {
	if ((strcmp(e->d_name, ".") == 0) \|\| (strcmp(e->d_name, "..") == 0)) {
	continue;
	}
	std::string filename(dirpath);
	filename.push_back('/');
	filename.append(e->d_name);
	int stat_result = lstat(filename.c_str(), &s);
	ASSERT_EQ(0, stat_result) << "unable to stat " << filename;
	if (S_ISDIR(s.st_mode)) {
	if (recursive) {
	ClearDirectory(filename.c_str());
	int rmdir_result = rmdir(filename.c_str());
	ASSERT_EQ(0, rmdir_result) << filename;
	}
	} else {
	int unlink_result = unlink(filename.c_str());
	ASSERT_EQ(0, unlink_result) << filename;
	}
	}
	closedir(dir);
	}

	void CommonArtTestImpl::TearDown() {
	const char* android_data = getenv("ANDROID_DATA");
	ASSERT_TRUE(android_data != nullptr);
	ClearDirectory(dalvik_cache_.c_str());
	int rmdir_cache_result = rmdir(dalvik_cache_.c_str());
	ASSERT_EQ(0, rmdir_cache_result);
	TearDownAndroidDataDir(android_data_, true);
	dalvik_cache_.clear();
	}

	static std::string GetDexFileName(const std::string& jar_prefix, bool host) {
	std::string path = GetAndroidRoot();

	std::string suffix = host
	? "-hostdex" // The host version.
	: "-testdex"; // The unstripped target version.

	return StringPrintf("%s/framework/%s%s.jar", path.c_str(), jar_prefix.c_str(), suffix.c_str());
	}

	std::vector<std::string> CommonArtTestImpl::GetLibCoreModuleNames() const {
	// Note: This must start with the CORE_IMG_JARS in Android.common_path.mk
	// because that's what we use for compiling the core.art image.
	// It may contain additional modules from TEST_CORE_JARS.
	return {
	// CORE_IMG_JARS modules.
	"core-oj",
	"core-libart",
	"core-icu4j",
	"okhttp",
	"bouncycastle",
	"apache-xml",
	// Additional modules.
	"conscrypt",
	};
	}

	std::vector<std::string> CommonArtTestImpl::GetLibCoreDexFileNames(
	const std::vector<std::string>& modules) const {
	std::vector<std::string> result;
	result.reserve(modules.size());
	for (const std::string& module : modules) {
	result.push_back(GetDexFileName(module, IsHost()));
	}
	return result;
	}

	std::vector<std::string> CommonArtTestImpl::GetLibCoreDexFileNames() const {
	std::vector<std::string> modules = GetLibCoreModuleNames();
	return GetLibCoreDexFileNames(modules);
	}

	std::vector<std::string> CommonArtTestImpl::GetLibCoreDexLocations(
	const std::vector<std::string>& modules) const {
	std::vector<std::string> result = GetLibCoreDexFileNames(modules);
	if (IsHost()) {
	// Strip the ANDROID_BUILD_TOP directory including the directory separator '/'.
	const char* host_dir = getenv("ANDROID_BUILD_TOP");
	CHECK(host_dir != nullptr);
	std::string prefix = host_dir;
	CHECK(!prefix.empty());
	if (prefix.back() != '/') {
	prefix += '/';
	}
	for (std::string& location : result) {
	CHECK_GT(location.size(), prefix.size());
	CHECK_EQ(location.compare(0u, prefix.size(), prefix), 0);
	location.erase(0u, prefix.size());
	}
	}
	return result;
	}

	std::vector<std::string> CommonArtTestImpl::GetLibCoreDexLocations() const {
	std::vector<std::string> modules = GetLibCoreModuleNames();
	return GetLibCoreDexLocations(modules);
	}

	std::string CommonArtTestImpl::GetClassPathOption(const char* option,
	const std::vector<std::string>& class_path) {
	return option + android::base::Join(class_path, ':');
	}

	// Check that for target builds we have ART_TARGET_NATIVETEST_DIR set.
	#ifdef ART_TARGET
	#ifndef ART_TARGET_NATIVETEST_DIR
	#error "ART_TARGET_NATIVETEST_DIR not set."
	#endif
	// Wrap it as a string literal.
	#define ART_TARGET_NATIVETEST_DIR_STRING STRINGIFY(ART_TARGET_NATIVETEST_DIR) "/"
	#else
	#define ART_TARGET_NATIVETEST_DIR_STRING ""
	#endif

	std::string CommonArtTestImpl::GetTestDexFileName(const char* name) const {
	CHECK(name != nullptr);
	std::string filename;
	if (IsHost()) {
	filename += GetAndroidRoot() + "/framework/";
	} else {
	filename += ART_TARGET_NATIVETEST_DIR_STRING;
	}
	filename += "art-gtest-";
	filename += name;
	filename += ".jar";
	return filename;
	}

	std::vector<std::unique_ptr<const DexFile>> CommonArtTestImpl::OpenDexFiles(const char* filename) {
	static constexpr bool kVerify = true;
	static constexpr bool kVerifyChecksum = true;
	std::string error_msg;
	const ArtDexFileLoader dex_file_loader;
	std::vector<std::unique_ptr<const DexFile>> dex_files;
	bool success = dex_file_loader.Open(filename,
	filename,
	kVerify,
	kVerifyChecksum,
	&error_msg,
	&dex_files);
	CHECK(success) << "Failed to open '" << filename << "': " << error_msg;
	for (auto& dex_file : dex_files) {
	CHECK_EQ(PROT_READ, dex_file->GetPermissions());
	CHECK(dex_file->IsReadOnly());
	}
	return dex_files;
	}

	std::unique_ptr<const DexFile> CommonArtTestImpl::OpenDexFile(const char* filename) {
	std::vector<std::unique_ptr<const DexFile>> dex_files(OpenDexFiles(filename));
	CHECK_EQ(dex_files.size(), 1u) << "Expected only one dex file";
	return std::move(dex_files[0]);
	}

	std::vector<std::unique_ptr<const DexFile>> CommonArtTestImpl::OpenTestDexFiles(
	const char* name) {
	return OpenDexFiles(GetTestDexFileName(name).c_str());
	}

	std::unique_ptr<const DexFile> CommonArtTestImpl::OpenTestDexFile(const char* name) {
	return OpenDexFile(GetTestDexFileName(name).c_str());
	}

	std::string CommonArtTestImpl::GetCoreFileLocation(const char* suffix) {
	CHECK(suffix != nullptr);

	std::string location;
	if (IsHost()) {
	std::string host_dir = GetAndroidRoot();
	location = StringPrintf("%s/framework/core.%s", host_dir.c_str(), suffix);
	} else {
	location = StringPrintf("/data/art-test/core.%s", suffix);
	}

	return location;
	}

	std::string CommonArtTestImpl::CreateClassPath(
	const std::vector<std::unique_ptr<const DexFile>>& dex_files) {
	CHECK(!dex_files.empty());
	std::string classpath = dex_files[0]->GetLocation();
	for (size_t i = 1; i < dex_files.size(); i++) {
	classpath += ":" + dex_files[i]->GetLocation();
	}
	return classpath;
	}

	std::string CommonArtTestImpl::CreateClassPathWithChecksums(
	const std::vector<std::unique_ptr<const DexFile>>& dex_files) {
	CHECK(!dex_files.empty());
	std::string classpath = dex_files[0]->GetLocation() + "*" +
	std::to_string(dex_files[0]->GetLocationChecksum());
	for (size_t i = 1; i < dex_files.size(); i++) {
	classpath += ":" + dex_files[i]->GetLocation() + "*" +
	std::to_string(dex_files[i]->GetLocationChecksum());
	}
	return classpath;
	}

	CommonArtTestImpl::ForkAndExecResult CommonArtTestImpl::ForkAndExec(
	const std::vector<std::string>& argv,
	const PostForkFn& post_fork,
	const OutputHandlerFn& handler) {
	ForkAndExecResult result;
	result.status_code = 0;
	result.stage = ForkAndExecResult::kLink;

	std::vector<const char*> c_args;
	for (const std::string& str : argv) {
	c_args.push_back(str.c_str());
	}
	c_args.push_back(nullptr);

	android::base::unique_fd link[2];
	{
	int link_fd[2];

	if (pipe(link_fd) == -1) {
	return result;
	}
	link[0].reset(link_fd[0]);
	link[1].reset(link_fd[1]);
	}

	result.stage = ForkAndExecResult::kFork;

	pid_t pid = fork();
	if (pid == -1) {
	return result;
	}

	if (pid == 0) {
	if (!post_fork()) {
	LOG(ERROR) << "Failed post-fork function";
	exit(1);
	UNREACHABLE();
	}

	// Redirect stdout and stderr.
	dup2(link[1].get(), STDOUT_FILENO);
	dup2(link[1].get(), STDERR_FILENO);

	link[0].reset();
	link[1].reset();

	execv(c_args[0], const_cast<char* const*>(c_args.data()));
	exit(1);
	UNREACHABLE();
	}

	result.stage = ForkAndExecResult::kWaitpid;
	link[1].reset();

	char buffer[128] = { 0 };
	ssize_t bytes_read = 0;
	while (TEMP_FAILURE_RETRY(bytes_read = read(link[0].get(), buffer, 128)) > 0) {
	handler(buffer, bytes_read);
	}
	handler(buffer, 0u); // End with a virtual write of zero length to simplify clients.

	link[0].reset();

	if (waitpid(pid, &result.status_code, 0) == -1) {
	return result;
	}

	result.stage = ForkAndExecResult::kFinished;
	return result;
	}

	CommonArtTestImpl::ForkAndExecResult CommonArtTestImpl::ForkAndExec(
	const std::vector<std::string>& argv, const PostForkFn& post_fork, std::string* output) {
	auto string_collect_fn = [output](char* buf, size_t len) {
	*output += std::string(buf, len);
	};
	return ForkAndExec(argv, post_fork, string_collect_fn);
	}

	} // namespace art