libartbase/base/common_art_test.cc - LeafOS-Project/android_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 <cstdio>
 #include "nativehelper/scoped_local_ref.h"

 #include "android-base/stringprintf.h"
 #include "android-base/unique_fd.h"
 #include <unicode/uvernum.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, 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) {
   *this = std::move(other);
 }

 ScratchFile& ScratchFile::operator=(ScratchFile&& other) {
   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::SetUpAndroidRoot() {
   if (IsHost()) {
     // $ANDROID_ROOT is set on the device, but not necessarily on the host.
     // But it needs to be set so that icu4c can find its locale data.
     const char* android_root_from_env = getenv("ANDROID_ROOT");
     if (android_root_from_env == nullptr) {
       // Use ANDROID_HOST_OUT for ANDROID_ROOT if it is set.
       const char* android_host_out = getenv("ANDROID_HOST_OUT");
       if (android_host_out != nullptr) {
         setenv("ANDROID_ROOT", android_host_out, 1);
       } else {
         // Build it from ANDROID_BUILD_TOP or cwd
         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);
         }
 #if defined(__linux__)
         root += "/out/host/linux-x86";
 #elif defined(__APPLE__)
         root += "/out/host/darwin-x86";
 #else
 #error unsupported OS
 #endif
         setenv("ANDROID_ROOT", root.c_str(), 1);
       }
     }
     setenv("LD_LIBRARY_PATH", ":", 0);  // Required by java.lang.System.<clinit>.

     // Not set by build server, so default
     if (getenv("ANDROID_HOST_OUT") == nullptr) {
       setenv("ANDROID_HOST_OUT", getenv("ANDROID_ROOT"), 1);
     }
   }
 }

 void CommonArtTestImpl::SetUpAndroidData(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() {
   SetUpAndroidRoot();
   SetUpAndroidData(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);
 }

 void CommonArtTestImpl::TearDownAndroidData(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-glibc2.15",
                             "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);
   TearDownAndroidData(android_data_, true);
   dalvik_cache_.clear();
 }

 static std::string GetDexFileName(const std::string& jar_prefix, bool host) {
   std::string path;
   if (host) {
     const char* host_dir = getenv("ANDROID_HOST_OUT");
     CHECK(host_dir != nullptr);
     path = host_dir;
   } else {
     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::GetLibCoreDexFileNames() {
   return std::vector<std::string>({GetDexFileName("core-oj", IsHost()),
                                    GetDexFileName("core-libart", IsHost()),
                                    GetDexFileName("core-simple", IsHost())});
 }

 std::string CommonArtTestImpl::GetTestAndroidRoot() {
   if (IsHost()) {
     const char* host_dir = getenv("ANDROID_HOST_OUT");
     CHECK(host_dir != nullptr);
     return host_dir;
   }
   return GetAndroidRoot();
 }

 // 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 += getenv("ANDROID_HOST_OUT");
     filename += "/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::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) {
   std::vector<std::unique_ptr<const DexFile>> vector = OpenTestDexFiles(name);
   EXPECT_EQ(1U, vector.size());
   return std::move(vector[0]);
 }

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

   std::string location;
   if (IsHost()) {
     const char* host_dir = getenv("ANDROID_HOST_OUT");
     CHECK(host_dir != nullptr);
     location = StringPrintf("%s/framework/core.%s", host_dir, 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 <cstdio>
	#include "nativehelper/scoped_local_ref.h"

	#include "android-base/stringprintf.h"
	#include "android-base/unique_fd.h"
	#include <unicode/uvernum.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, 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) {
	*this = std::move(other);
	}

	ScratchFile& ScratchFile::operator=(ScratchFile&& other) {
	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::SetUpAndroidRoot() {
	if (IsHost()) {
	// $ANDROID_ROOT is set on the device, but not necessarily on the host.
	// But it needs to be set so that icu4c can find its locale data.
	const char* android_root_from_env = getenv("ANDROID_ROOT");
	if (android_root_from_env == nullptr) {
	// Use ANDROID_HOST_OUT for ANDROID_ROOT if it is set.
	const char* android_host_out = getenv("ANDROID_HOST_OUT");
	if (android_host_out != nullptr) {
	setenv("ANDROID_ROOT", android_host_out, 1);
	} else {
	// Build it from ANDROID_BUILD_TOP or cwd
	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);
	}
	#if defined(__linux__)
	root += "/out/host/linux-x86";
	#elif defined(__APPLE__)
	root += "/out/host/darwin-x86";
	#else
	#error unsupported OS
	#endif
	setenv("ANDROID_ROOT", root.c_str(), 1);
	}
	}
	setenv("LD_LIBRARY_PATH", ":", 0); // Required by java.lang.System.<clinit>.

	// Not set by build server, so default
	if (getenv("ANDROID_HOST_OUT") == nullptr) {
	setenv("ANDROID_HOST_OUT", getenv("ANDROID_ROOT"), 1);
	}
	}
	}

	void CommonArtTestImpl::SetUpAndroidData(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() {
	SetUpAndroidRoot();
	SetUpAndroidData(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);
	}

	void CommonArtTestImpl::TearDownAndroidData(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-glibc2.15",
	"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);
	TearDownAndroidData(android_data_, true);
	dalvik_cache_.clear();
	}

	static std::string GetDexFileName(const std::string& jar_prefix, bool host) {
	std::string path;
	if (host) {
	const char* host_dir = getenv("ANDROID_HOST_OUT");
	CHECK(host_dir != nullptr);
	path = host_dir;
	} else {
	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::GetLibCoreDexFileNames() {
	return std::vector<std::string>({GetDexFileName("core-oj", IsHost()),
	GetDexFileName("core-libart", IsHost()),
	GetDexFileName("core-simple", IsHost())});
	}

	std::string CommonArtTestImpl::GetTestAndroidRoot() {
	if (IsHost()) {
	const char* host_dir = getenv("ANDROID_HOST_OUT");
	CHECK(host_dir != nullptr);
	return host_dir;
	}
	return GetAndroidRoot();
	}

	// 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 += getenv("ANDROID_HOST_OUT");
	filename += "/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::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) {
	std::vector<std::unique_ptr<const DexFile>> vector = OpenTestDexFiles(name);
	EXPECT_EQ(1U, vector.size());
	return std::move(vector[0]);
	}

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

	std::string location;
	if (IsHost()) {
	const char* host_dir = getenv("ANDROID_HOST_OUT");
	CHECK(host_dir != nullptr);
	location = StringPrintf("%s/framework/core.%s", host_dir, 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