src/dex2oat.cc - platform/art - Git at Google

 // Copyright 2011 Google Inc. All Rights Reserved.

 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/file.h>

 #include <string>
 #include <vector>

 #include "class_linker.h"
 #include "class_loader.h"
 #include "compiler.h"
 #include "file.h"
 #include "image_writer.h"
 #include "oat_writer.h"
 #include "os.h"
 #include "runtime.h"
 #include "stringpiece.h"

 namespace art {

 static void usage() {
   fprintf(stderr,
           "Usage: dex2oat [options]...\n"
           "\n");
   fprintf(stderr,
           "  --dex-file=<dex-file>: specifies a .dex file to compile. At least one .dex\n"
           "      file must be specified. \n"
           "      Example: --dex-file=/system/framework/core.jar\n"
           "\n");
   fprintf(stderr,
           "  --image=<file.art>: specifies the required output image filename.\n"
           "      Example: --image=/data/art-cache/boot.art\n"
           "\n");
   // TODO: remove this by inferring from --image
   fprintf(stderr,
           "  --oat=<file.oat>: specifies the required oat filename.\n"
           "      Example: --image=/data/art-cache/boot.oat\n"
           "\n");
   fprintf(stderr,
           "  --base=<hex-address>: specifies the base address when creating a boot image.\n"
           "      Example: --base=0x50000000\n"
           "\n");
   fprintf(stderr,
           "  --boot-image=<file.art>: provide the image file for the boot class path.\n"
           "      Example: --boot-image=/data/art-cache/boot.art\n"
           "\n");
   fprintf(stderr,
           "  --method may be used to limit compilation to a subset of methods.\n"
           "      Example: --method=Ljava/lang/Object;<init>()V\n"
           "\n");
   fprintf(stderr,
           "  --host-prefix may be used to translate host paths to target paths during\n"
           "      cross compilation.\n"
           "      Example: --host-prefix=out/target/product/crespo\n"
           "\n");
   fprintf(stderr,
           "  --runtime-arg <argument>: used to specify various arguments for the runtime,\n"
           "      such as initial heap size, maximum heap size, and verbose output.\n"
           "      Use a separate --runtime-arg switch for each argument.\n"
           "      Example: --runtime-arg -Xms256m\n"
           "\n");
   exit(EXIT_FAILURE);
 }

 class FileJanitor {
 public:
   FileJanitor(const std::string& filename, int fd)
       : filename_(filename), fd_(fd), do_unlink_(true) {
   }

   void KeepFile() {
     do_unlink_ = false;
   }

   ~FileJanitor() {
     if (fd_ != -1) {
       int rc = TEMP_FAILURE_RETRY(flock(fd_, LOCK_UN));
       if (rc == -1) {
         PLOG(ERROR) << "Failed to unlock " << filename_;
       }
     }
     if (do_unlink_) {
       int rc = TEMP_FAILURE_RETRY(unlink(filename_.c_str()));
       if (rc == -1) {
         PLOG(ERROR) << "Failed to unlink " << filename_;
       }
     }
   }

 private:
   std::string filename_;
   int fd_;
   bool do_unlink_;
 };

 // Returns true if dex_files has a dex with the named location.
 bool DexFilesContains(const std::vector<const DexFile*>& dex_files, const std::string& location) {
   for (size_t i = 0; i < dex_files.size(); ++i) {
     if (dex_files[i]->GetLocation() == location) {
       return true;
     }
   }
   return false;
 }

 // Appends to dex_files any elements of class_path that it doesn't already
 // contain. This will open those dex files as necessary.
 void OpenClassPathFiles(const std::string& class_path, std::vector<const DexFile*>& dex_files) {
   std::vector<std::string> parsed;
   Split(class_path, ':', parsed);
   for (size_t i = 0; i < parsed.size(); ++i) {
     if (DexFilesContains(dex_files, parsed[i])) {
       continue;
     }
     const DexFile* dex_file = DexFile::Open(parsed[i], Runtime::Current()->GetHostPrefix());
     if (dex_file == NULL) {
       LOG(WARNING) << "Failed to open dex file " << parsed[i];
     } else {
       dex_files.push_back(dex_file);
     }
   }
 }

 int dex2oat(int argc, char** argv) {
   // Skip over argv[0].
   argv++;
   argc--;

   if (argc == 0) {
     fprintf(stderr, "no arguments specified\n");
     usage();
   }

   std::vector<const char*> dex_filenames;
   std::vector<const char*> method_names;
   std::string oat_filename;
   const char* image_filename = NULL;
   std::string boot_image_option;
   uintptr_t image_base = 0;
   std::string host_prefix;
   std::vector<const char*> runtime_args;

   for (int i = 0; i < argc; i++) {
     const StringPiece option(argv[i]);
     if (false) {
       LOG(INFO) << "dex2oat: option[" << i << "]=" << argv[i];
     }
     if (option.starts_with("--dex-file=")) {
       dex_filenames.push_back(option.substr(strlen("--dex-file=")).data());
     } else if (option.starts_with("--method=")) {
       method_names.push_back(option.substr(strlen("--method=")).data());
     } else if (option.starts_with("--oat=")) {
       oat_filename = option.substr(strlen("--oat=")).data();
     } else if (option.starts_with("--image=")) {
       image_filename = option.substr(strlen("--image=")).data();
     } else if (option.starts_with("--base=")) {
       const char* image_base_str = option.substr(strlen("--base=")).data();
       char* end;
       image_base = strtoul(image_base_str, &end, 16);
       if (end == image_base_str || *end != '\0') {
         fprintf(stderr, "Failed to parse hexadecimal value for option %s\n", option.data());
         usage();
       }
     } else if (option.starts_with("--boot-image=")) {
       const char* boot_image_filename = option.substr(strlen("--boot-image=")).data();
       boot_image_option.clear();
       boot_image_option += "-Ximage:";
       boot_image_option += boot_image_filename;
     } else if (option.starts_with("--host-prefix=")) {
       host_prefix = option.substr(strlen("--host-prefix=")).data();
     } else if (option == "--runtime-arg") {
       if (++i >= argc) {
         fprintf(stderr, "Missing required argument for --runtime-arg\n");
         usage();
       }
       runtime_args.push_back(argv[i]);
     } else {
       fprintf(stderr, "unknown argument %s\n", option.data());
       usage();
     }
   }

   if (oat_filename == NULL) {
     fprintf(stderr, "--oat file name not specified\n");
     return EXIT_FAILURE;
   }

   if (image_filename == NULL && boot_image_option.empty()) {
     fprintf(stderr, "Either --image or --boot-image must be specified\n");
     return EXIT_FAILURE;
   }

   if (dex_filenames.empty()) {
     fprintf(stderr, "no --dex-file values specified\n");
     return EXIT_FAILURE;
   }

   if (boot_image_option.empty()) {
     if (image_base == 0) {
       fprintf(stderr, "non-zero --base not specified\n");
       return EXIT_FAILURE;
     }
   }

   // Create the output file if we can, or open it read-only if we weren't first.
   bool did_create = true;
   int fd = open(oat_filename.c_str(), O_EXCL | O_CREAT | O_TRUNC | O_RDWR, 0666);
   if (fd == -1) {
     if (errno != EEXIST) {
       PLOG(ERROR) << "Unable to create oat file " << oat_filename;
       return EXIT_FAILURE;
     }
     did_create = false;
     fd = open(oat_filename.c_str(), O_RDONLY);
     if (fd == -1) {
       PLOG(ERROR) << "Unable to open oat file for reading " << oat_filename;
       return EXIT_FAILURE;
     }
   }

   // Handles removing the file on failure and unlocking on both failure and success.
   FileJanitor file_janitor(oat_filename, fd);

   // If we won the creation race, block trying to take the lock (since we're going to be doing
   // the work, we need the lock). If we lost the creation race, spin trying to take the lock
   // non-blocking until we fail -- at which point we know the other guy has the lock -- and then
   // block trying to take the now-taken lock.
   if (did_create) {
     LOG(INFO) << "This process created " << oat_filename;
     while (TEMP_FAILURE_RETRY(flock(fd, LOCK_EX)) != 0) {
       // Try again.
     }
     LOG(INFO) << "This process created and locked " << oat_filename;
   } else {
     LOG(INFO) << "Another process has already created " << oat_filename;
     while (TEMP_FAILURE_RETRY(flock(fd, LOCK_EX | LOCK_NB)) == 0) {
       // Give up the lock and hope the creator has taken the lock next time round.
       int rc = TEMP_FAILURE_RETRY(flock(fd, LOCK_UN));
       if (rc == -1) {
         PLOG(FATAL) << "Failed to unlock " << oat_filename;
       }
     }
     // Now a non-blocking attempt to take the lock has failed, we know the other guy has the
     // lock, so block waiting to take it.
     LOG(INFO) << "Another process is already working on " << oat_filename;
     if (TEMP_FAILURE_RETRY(flock(fd, LOCK_EX)) != 0) {
       PLOG(ERROR) << "Waiter unable to wait for creator to finish " << oat_filename;
       return EXIT_FAILURE;
     }
     // We have the lock and the creator has finished.
     // TODO: check the creator did a good job by checking the header.
     LOG(INFO) << "Another process finished working on " << oat_filename;
     // Job done.
     file_janitor.KeepFile();
     return EXIT_SUCCESS;
   }

   // If we get this far, we won the creation race and have locked the file.
   UniquePtr<File> oat_file(OS::FileFromFd(oat_filename.c_str(), fd));

   LOG(INFO) << "dex2oat: " << oat_file->name();

   Runtime::Options options;
   options.push_back(std::make_pair("compiler", reinterpret_cast<void*>(NULL)));
   std::string boot_class_path_string;
   if (boot_image_option.empty()) {
     boot_class_path_string += "-Xbootclasspath:";
     for (size_t i = 0; i < dex_filenames.size()-1; i++) {
       boot_class_path_string += dex_filenames[i];
       boot_class_path_string += ":";
     }
     boot_class_path_string += dex_filenames[dex_filenames.size()-1];
     options.push_back(std::make_pair(boot_class_path_string.c_str(), reinterpret_cast<void*>(NULL)));
   } else {
     options.push_back(std::make_pair(boot_image_option.c_str(), reinterpret_cast<void*>(NULL)));
   }
   if (!host_prefix.empty()) {
     options.push_back(std::make_pair("host-prefix", host_prefix.c_str()));
   }
   for (size_t i = 0; i < runtime_args.size(); i++) {
     options.push_back(std::make_pair(runtime_args[i], reinterpret_cast<void*>(NULL)));
   }
   UniquePtr<Runtime> runtime(Runtime::Create(options, false));
   if (runtime.get() == NULL) {
     LOG(ERROR) << "Could not create runtime";
     return EXIT_FAILURE;
   }
   ClassLinker* class_linker = runtime->GetClassLinker();

   // If we have an existing boot image, position new space after its oat file
   if (Heap::GetSpaces().size() > 1) {
     Space* last_image_space = Heap::GetSpaces()[Heap::GetSpaces().size()-2];
     CHECK(last_image_space != NULL);
     CHECK(last_image_space->IsImageSpace());
     CHECK(!Heap::GetSpaces()[Heap::GetSpaces().size()-1]->IsImageSpace());
     byte* oat_limit_addr = last_image_space->GetImageHeader().GetOatLimitAddr();
     image_base = RoundUp(reinterpret_cast<uintptr_t>(oat_limit_addr), kPageSize);
   }

   // ClassLoader creation needs to come after Runtime::Create
   SirtRef<ClassLoader> class_loader(NULL);
   std::vector<const DexFile*> dex_files;
   if (!boot_image_option.empty()) {
     DexFile::OpenDexFiles(dex_filenames, dex_files, host_prefix);
     std::vector<const DexFile*> class_path_files(dex_files);
     OpenClassPathFiles(runtime->GetClassPath(), class_path_files);
     for (size_t i = 0; i < class_path_files.size(); i++) {
       class_linker->RegisterDexFile(*class_path_files[i]);
     }
     class_loader.reset(PathClassLoader::AllocCompileTime(class_path_files));
   } else {
     dex_files = runtime->GetClassLinker()->GetBootClassPath();
   }

   // if we loaded an existing image, we will reuse values from the image roots.
   if (!runtime->HasJniDlsymLookupStub()) {
     runtime->SetJniDlsymLookupStub(Compiler::CreateJniDlysmLookupStub(kThumb2));
   }
   if (!runtime->HasAbstractMethodErrorStubArray()) {
     runtime->SetAbstractMethodErrorStubArray(Compiler::CreateAbstractMethodErrorStub(kThumb2));
   }
   for (int i = 0; i < Runtime::kLastTrampolineMethodType; i++) {
     Runtime::TrampolineType type = Runtime::TrampolineType(i);
     if (!runtime->HasResolutionStubArray(type)) {
       runtime->SetResolutionStubArray(Compiler::CreateResolutionStub(kThumb2, type), type);
     }
   }
   for (int i = 0; i < Runtime::kLastCalleeSaveType; i++) {
     Runtime::CalleeSaveType type = Runtime::CalleeSaveType(i);
     if (!runtime->HasCalleeSaveMethod(type)) {
       runtime->SetCalleeSaveMethod(runtime->CreateCalleeSaveMethod(kThumb2, type), type);
     }
   }
   Compiler compiler(kThumb2, image_filename != NULL);
   if (method_names.empty()) {
     compiler.CompileAll(class_loader.get(), dex_files);
   } else {
     for (size_t i = 0; i < method_names.size(); i++) {
       // names are actually class_descriptor + name + signature.
       // example: Ljava/lang/Object;<init>()V
       StringPiece method_name = method_names[i];
       size_t end_of_class_descriptor = method_name.find(';');
       if (end_of_class_descriptor == method_name.npos) {
         LOG(ERROR) << "Could not find class descriptor in method " << method_name << "'";
         return EXIT_FAILURE;
       }
       end_of_class_descriptor++;  // want to include ;
       std::string class_descriptor = method_name.substr(0, end_of_class_descriptor).ToString();
       size_t end_of_name = method_name.find('(', end_of_class_descriptor);
       if (end_of_name == method_name.npos) {
         LOG(ERROR) << "Could not find start of method signature in method '" << method_name << "'";
         return EXIT_FAILURE;
       }
       std::string name = method_name.substr(end_of_class_descriptor,
                                             end_of_name - end_of_class_descriptor).ToString();
       std::string signature = method_name.substr(end_of_name).ToString();

       Class* klass = class_linker->FindClass(class_descriptor, class_loader.get());
       if (klass == NULL) {
         LOG(ERROR) << "Could not find class for descriptor '" << class_descriptor
             << "' in method '" << method_name << "'";
         return EXIT_FAILURE;
       }
       Method* method = klass->FindDirectMethod(name, signature);
       if (method == NULL) {
           method = klass->FindVirtualMethod(name, signature);
       }
       if (method == NULL) {
         LOG(ERROR) << "Could not find method '" << method_name << "' with signature '"
             << signature << "' in class '" << class_descriptor << "' for method argument '"
             << method_name << "'";
         return EXIT_FAILURE;
       }
       compiler.CompileOne(method);
     }
   }

   if (!OatWriter::Create(oat_file.get(), class_loader.get(), compiler)) {
     LOG(ERROR) << "Failed to create oat file " << oat_file->name();
     return EXIT_FAILURE;
   }

   if (image_filename == NULL) {
     file_janitor.KeepFile();
     LOG(INFO) << "Oat file written successfully " << oat_file->name();
     return EXIT_SUCCESS;
   }
   CHECK(compiler.IsImage());

   ImageWriter image_writer;
   if (!image_writer.Write(image_filename, image_base, oat_file->name(), host_prefix)) {
     LOG(ERROR) << "Failed to create image file " << image_filename;
     return EXIT_FAILURE;
   }

   // We wrote the file successfully, and want to keep it.
   LOG(INFO) << "Image written successfully " << image_filename;
   file_janitor.KeepFile();
   return EXIT_SUCCESS;
 }

 } // namespace art

 int main(int argc, char** argv) {
   return art::dex2oat(argc, argv);
 }
	// Copyright 2011 Google Inc. All Rights Reserved.

	#include <stdio.h>
	#include <stdlib.h>
	#include <sys/file.h>

	#include <string>
	#include <vector>

	#include "class_linker.h"
	#include "class_loader.h"
	#include "compiler.h"
	#include "file.h"
	#include "image_writer.h"
	#include "oat_writer.h"
	#include "os.h"
	#include "runtime.h"
	#include "stringpiece.h"

	namespace art {

	static void usage() {
	fprintf(stderr,
	"Usage: dex2oat [options]...\n"
	"\n");
	fprintf(stderr,
	" --dex-file=<dex-file>: specifies a .dex file to compile. At least one .dex\n"
	" file must be specified. \n"
	" Example: --dex-file=/system/framework/core.jar\n"
	"\n");
	fprintf(stderr,
	" --image=<file.art>: specifies the required output image filename.\n"
	" Example: --image=/data/art-cache/boot.art\n"
	"\n");
	// TODO: remove this by inferring from --image
	fprintf(stderr,
	" --oat=<file.oat>: specifies the required oat filename.\n"
	" Example: --image=/data/art-cache/boot.oat\n"
	"\n");
	fprintf(stderr,
	" --base=<hex-address>: specifies the base address when creating a boot image.\n"
	" Example: --base=0x50000000\n"
	"\n");
	fprintf(stderr,
	" --boot-image=<file.art>: provide the image file for the boot class path.\n"
	" Example: --boot-image=/data/art-cache/boot.art\n"
	"\n");
	fprintf(stderr,
	" --method may be used to limit compilation to a subset of methods.\n"
	" Example: --method=Ljava/lang/Object;<init>()V\n"
	"\n");
	fprintf(stderr,
	" --host-prefix may be used to translate host paths to target paths during\n"
	" cross compilation.\n"
	" Example: --host-prefix=out/target/product/crespo\n"
	"\n");
	fprintf(stderr,
	" --runtime-arg <argument>: used to specify various arguments for the runtime,\n"
	" such as initial heap size, maximum heap size, and verbose output.\n"
	" Use a separate --runtime-arg switch for each argument.\n"
	" Example: --runtime-arg -Xms256m\n"
	"\n");
	exit(EXIT_FAILURE);
	}

	class FileJanitor {
	public:
	FileJanitor(const std::string& filename, int fd)
	: filename_(filename), fd_(fd), do_unlink_(true) {
	}

	void KeepFile() {
	do_unlink_ = false;
	}

	~FileJanitor() {
	if (fd_ != -1) {
	int rc = TEMP_FAILURE_RETRY(flock(fd_, LOCK_UN));
	if (rc == -1) {
	PLOG(ERROR) << "Failed to unlock " << filename_;
	}
	}
	if (do_unlink_) {
	int rc = TEMP_FAILURE_RETRY(unlink(filename_.c_str()));
	if (rc == -1) {
	PLOG(ERROR) << "Failed to unlink " << filename_;
	}
	}
	}

	private:
	std::string filename_;
	int fd_;
	bool do_unlink_;
	};

	// Returns true if dex_files has a dex with the named location.
	bool DexFilesContains(const std::vector<const DexFile*>& dex_files, const std::string& location) {
	for (size_t i = 0; i < dex_files.size(); ++i) {
	if (dex_files[i]->GetLocation() == location) {
	return true;
	}
	}
	return false;
	}

	// Appends to dex_files any elements of class_path that it doesn't already
	// contain. This will open those dex files as necessary.
	void OpenClassPathFiles(const std::string& class_path, std::vector<const DexFile*>& dex_files) {
	std::vector<std::string> parsed;
	Split(class_path, ':', parsed);
	for (size_t i = 0; i < parsed.size(); ++i) {
	if (DexFilesContains(dex_files, parsed[i])) {
	continue;
	}
	const DexFile* dex_file = DexFile::Open(parsed[i], Runtime::Current()->GetHostPrefix());
	if (dex_file == NULL) {
	LOG(WARNING) << "Failed to open dex file " << parsed[i];
	} else {
	dex_files.push_back(dex_file);
	}
	}
	}

	int dex2oat(int argc, char** argv) {
	// Skip over argv[0].
	argv++;
	argc--;

	if (argc == 0) {
	fprintf(stderr, "no arguments specified\n");
	usage();
	}

	std::vector<const char*> dex_filenames;
	std::vector<const char*> method_names;
	std::string oat_filename;
	const char* image_filename = NULL;
	std::string boot_image_option;
	uintptr_t image_base = 0;
	std::string host_prefix;
	std::vector<const char*> runtime_args;

	for (int i = 0; i < argc; i++) {
	const StringPiece option(argv[i]);
	if (false) {
	LOG(INFO) << "dex2oat: option[" << i << "]=" << argv[i];
	}
	if (option.starts_with("--dex-file=")) {
	dex_filenames.push_back(option.substr(strlen("--dex-file=")).data());
	} else if (option.starts_with("--method=")) {
	method_names.push_back(option.substr(strlen("--method=")).data());
	} else if (option.starts_with("--oat=")) {
	oat_filename = option.substr(strlen("--oat=")).data();
	} else if (option.starts_with("--image=")) {
	image_filename = option.substr(strlen("--image=")).data();
	} else if (option.starts_with("--base=")) {
	const char* image_base_str = option.substr(strlen("--base=")).data();
	char* end;
	image_base = strtoul(image_base_str, &end, 16);
	if (end == image_base_str \|\| *end != '\0') {
	fprintf(stderr, "Failed to parse hexadecimal value for option %s\n", option.data());
	usage();
	}
	} else if (option.starts_with("--boot-image=")) {
	const char* boot_image_filename = option.substr(strlen("--boot-image=")).data();
	boot_image_option.clear();
	boot_image_option += "-Ximage:";
	boot_image_option += boot_image_filename;
	} else if (option.starts_with("--host-prefix=")) {
	host_prefix = option.substr(strlen("--host-prefix=")).data();
	} else if (option == "--runtime-arg") {
	if (++i >= argc) {
	fprintf(stderr, "Missing required argument for --runtime-arg\n");
	usage();
	}
	runtime_args.push_back(argv[i]);
	} else {
	fprintf(stderr, "unknown argument %s\n", option.data());
	usage();
	}
	}

	if (oat_filename == NULL) {
	fprintf(stderr, "--oat file name not specified\n");
	return EXIT_FAILURE;
	}

	if (image_filename == NULL && boot_image_option.empty()) {
	fprintf(stderr, "Either --image or --boot-image must be specified\n");
	return EXIT_FAILURE;
	}

	if (dex_filenames.empty()) {
	fprintf(stderr, "no --dex-file values specified\n");
	return EXIT_FAILURE;
	}

	if (boot_image_option.empty()) {
	if (image_base == 0) {
	fprintf(stderr, "non-zero --base not specified\n");
	return EXIT_FAILURE;
	}
	}

	// Create the output file if we can, or open it read-only if we weren't first.
	bool did_create = true;
	int fd = open(oat_filename.c_str(), O_EXCL \| O_CREAT \| O_TRUNC \| O_RDWR, 0666);
	if (fd == -1) {
	if (errno != EEXIST) {
	PLOG(ERROR) << "Unable to create oat file " << oat_filename;
	return EXIT_FAILURE;
	}
	did_create = false;
	fd = open(oat_filename.c_str(), O_RDONLY);
	if (fd == -1) {
	PLOG(ERROR) << "Unable to open oat file for reading " << oat_filename;
	return EXIT_FAILURE;
	}
	}

	// Handles removing the file on failure and unlocking on both failure and success.
	FileJanitor file_janitor(oat_filename, fd);

	// If we won the creation race, block trying to take the lock (since we're going to be doing
	// the work, we need the lock). If we lost the creation race, spin trying to take the lock
	// non-blocking until we fail -- at which point we know the other guy has the lock -- and then
	// block trying to take the now-taken lock.
	if (did_create) {
	LOG(INFO) << "This process created " << oat_filename;
	while (TEMP_FAILURE_RETRY(flock(fd, LOCK_EX)) != 0) {
	// Try again.
	}
	LOG(INFO) << "This process created and locked " << oat_filename;
	} else {
	LOG(INFO) << "Another process has already created " << oat_filename;
	while (TEMP_FAILURE_RETRY(flock(fd, LOCK_EX \| LOCK_NB)) == 0) {
	// Give up the lock and hope the creator has taken the lock next time round.
	int rc = TEMP_FAILURE_RETRY(flock(fd, LOCK_UN));
	if (rc == -1) {
	PLOG(FATAL) << "Failed to unlock " << oat_filename;
	}
	}
	// Now a non-blocking attempt to take the lock has failed, we know the other guy has the
	// lock, so block waiting to take it.
	LOG(INFO) << "Another process is already working on " << oat_filename;
	if (TEMP_FAILURE_RETRY(flock(fd, LOCK_EX)) != 0) {
	PLOG(ERROR) << "Waiter unable to wait for creator to finish " << oat_filename;
	return EXIT_FAILURE;
	}
	// We have the lock and the creator has finished.
	// TODO: check the creator did a good job by checking the header.
	LOG(INFO) << "Another process finished working on " << oat_filename;
	// Job done.
	file_janitor.KeepFile();
	return EXIT_SUCCESS;
	}

	// If we get this far, we won the creation race and have locked the file.
	UniquePtr<File> oat_file(OS::FileFromFd(oat_filename.c_str(), fd));

	LOG(INFO) << "dex2oat: " << oat_file->name();

	Runtime::Options options;
	options.push_back(std::make_pair("compiler", reinterpret_cast<void*>(NULL)));
	std::string boot_class_path_string;
	if (boot_image_option.empty()) {
	boot_class_path_string += "-Xbootclasspath:";
	for (size_t i = 0; i < dex_filenames.size()-1; i++) {
	boot_class_path_string += dex_filenames[i];
	boot_class_path_string += ":";
	}
	boot_class_path_string += dex_filenames[dex_filenames.size()-1];
	options.push_back(std::make_pair(boot_class_path_string.c_str(), reinterpret_cast<void*>(NULL)));
	} else {
	options.push_back(std::make_pair(boot_image_option.c_str(), reinterpret_cast<void*>(NULL)));
	}
	if (!host_prefix.empty()) {
	options.push_back(std::make_pair("host-prefix", host_prefix.c_str()));
	}
	for (size_t i = 0; i < runtime_args.size(); i++) {
	options.push_back(std::make_pair(runtime_args[i], reinterpret_cast<void*>(NULL)));
	}
	UniquePtr<Runtime> runtime(Runtime::Create(options, false));
	if (runtime.get() == NULL) {
	LOG(ERROR) << "Could not create runtime";
	return EXIT_FAILURE;
	}
	ClassLinker* class_linker = runtime->GetClassLinker();

	// If we have an existing boot image, position new space after its oat file
	if (Heap::GetSpaces().size() > 1) {
	Space* last_image_space = Heap::GetSpaces()[Heap::GetSpaces().size()-2];
	CHECK(last_image_space != NULL);
	CHECK(last_image_space->IsImageSpace());
	CHECK(!Heap::GetSpaces()[Heap::GetSpaces().size()-1]->IsImageSpace());
	byte* oat_limit_addr = last_image_space->GetImageHeader().GetOatLimitAddr();
	image_base = RoundUp(reinterpret_cast<uintptr_t>(oat_limit_addr), kPageSize);
	}

	// ClassLoader creation needs to come after Runtime::Create
	SirtRef<ClassLoader> class_loader(NULL);
	std::vector<const DexFile*> dex_files;
	if (!boot_image_option.empty()) {
	DexFile::OpenDexFiles(dex_filenames, dex_files, host_prefix);
	std::vector<const DexFile*> class_path_files(dex_files);
	OpenClassPathFiles(runtime->GetClassPath(), class_path_files);
	for (size_t i = 0; i < class_path_files.size(); i++) {
	class_linker->RegisterDexFile(*class_path_files[i]);
	}
	class_loader.reset(PathClassLoader::AllocCompileTime(class_path_files));
	} else {
	dex_files = runtime->GetClassLinker()->GetBootClassPath();
	}

	// if we loaded an existing image, we will reuse values from the image roots.
	if (!runtime->HasJniDlsymLookupStub()) {
	runtime->SetJniDlsymLookupStub(Compiler::CreateJniDlysmLookupStub(kThumb2));
	}
	if (!runtime->HasAbstractMethodErrorStubArray()) {
	runtime->SetAbstractMethodErrorStubArray(Compiler::CreateAbstractMethodErrorStub(kThumb2));
	}
	for (int i = 0; i < Runtime::kLastTrampolineMethodType; i++) {
	Runtime::TrampolineType type = Runtime::TrampolineType(i);
	if (!runtime->HasResolutionStubArray(type)) {
	runtime->SetResolutionStubArray(Compiler::CreateResolutionStub(kThumb2, type), type);
	}
	}
	for (int i = 0; i < Runtime::kLastCalleeSaveType; i++) {
	Runtime::CalleeSaveType type = Runtime::CalleeSaveType(i);
	if (!runtime->HasCalleeSaveMethod(type)) {
	runtime->SetCalleeSaveMethod(runtime->CreateCalleeSaveMethod(kThumb2, type), type);
	}
	}
	Compiler compiler(kThumb2, image_filename != NULL);
	if (method_names.empty()) {
	compiler.CompileAll(class_loader.get(), dex_files);
	} else {
	for (size_t i = 0; i < method_names.size(); i++) {
	// names are actually class_descriptor + name + signature.
	// example: Ljava/lang/Object;<init>()V
	StringPiece method_name = method_names[i];
	size_t end_of_class_descriptor = method_name.find(';');
	if (end_of_class_descriptor == method_name.npos) {
	LOG(ERROR) << "Could not find class descriptor in method " << method_name << "'";
	return EXIT_FAILURE;
	}
	end_of_class_descriptor++; // want to include ;
	std::string class_descriptor = method_name.substr(0, end_of_class_descriptor).ToString();
	size_t end_of_name = method_name.find('(', end_of_class_descriptor);
	if (end_of_name == method_name.npos) {
	LOG(ERROR) << "Could not find start of method signature in method '" << method_name << "'";
	return EXIT_FAILURE;
	}
	std::string name = method_name.substr(end_of_class_descriptor,
	end_of_name - end_of_class_descriptor).ToString();
	std::string signature = method_name.substr(end_of_name).ToString();

	Class* klass = class_linker->FindClass(class_descriptor, class_loader.get());
	if (klass == NULL) {
	LOG(ERROR) << "Could not find class for descriptor '" << class_descriptor
	<< "' in method '" << method_name << "'";
	return EXIT_FAILURE;
	}
	Method* method = klass->FindDirectMethod(name, signature);
	if (method == NULL) {
	method = klass->FindVirtualMethod(name, signature);
	}
	if (method == NULL) {
	LOG(ERROR) << "Could not find method '" << method_name << "' with signature '"
	<< signature << "' in class '" << class_descriptor << "' for method argument '"
	<< method_name << "'";
	return EXIT_FAILURE;
	}
	compiler.CompileOne(method);
	}
	}

	if (!OatWriter::Create(oat_file.get(), class_loader.get(), compiler)) {
	LOG(ERROR) << "Failed to create oat file " << oat_file->name();
	return EXIT_FAILURE;
	}

	if (image_filename == NULL) {
	file_janitor.KeepFile();
	LOG(INFO) << "Oat file written successfully " << oat_file->name();
	return EXIT_SUCCESS;
	}
	CHECK(compiler.IsImage());

	ImageWriter image_writer;
	if (!image_writer.Write(image_filename, image_base, oat_file->name(), host_prefix)) {
	LOG(ERROR) << "Failed to create image file " << image_filename;
	return EXIT_FAILURE;
	}

	// We wrote the file successfully, and want to keep it.
	LOG(INFO) << "Image written successfully " << image_filename;
	file_janitor.KeepFile();
	return EXIT_SUCCESS;
	}

	} // namespace art

	int main(int argc, char** argv) {
	return art::dex2oat(argc, argv);
	}