/*
 * Copyright (C) 2011 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 "parsed_options.h"

#include <sstream>

#ifdef HAVE_ANDROID_OS
#include "cutils/properties.h"
#endif

#include "base/stringpiece.h"
#include "debugger.h"
#include "gc/heap.h"
#include "monitor.h"
#include "runtime.h"
#include "trace.h"
#include "utils.h"

namespace art {

ParsedOptions::ParsedOptions()
    :
    check_jni_(kIsDebugBuild),                      // -Xcheck:jni is off by default for regular
                                                    // builds but on by default in debug builds.
    force_copy_(false),
    compiler_callbacks_(nullptr),
    is_zygote_(false),
    must_relocate_(kDefaultMustRelocate),
    dex2oat_enabled_(true),
    image_dex2oat_enabled_(true),
    interpreter_only_(kPoisonHeapReferences),       // kPoisonHeapReferences currently works with
                                                    // the interpreter only.
                                                    // TODO: make it work with the compiler.
    is_explicit_gc_disabled_(false),
    use_tlab_(false),
    verify_pre_gc_heap_(false),
    verify_pre_sweeping_heap_(kIsDebugBuild),       // Pre sweeping is the one that usually fails
                                                    // if the GC corrupted the heap.
    verify_post_gc_heap_(false),
    verify_pre_gc_rosalloc_(kIsDebugBuild),
    verify_pre_sweeping_rosalloc_(false),
    verify_post_gc_rosalloc_(false),
    long_pause_log_threshold_(gc::Heap::kDefaultLongPauseLogThreshold),
    long_gc_log_threshold_(gc::Heap::kDefaultLongGCLogThreshold),
    dump_gc_performance_on_shutdown_(false),
    ignore_max_footprint_(false),
    heap_initial_size_(gc::Heap::kDefaultInitialSize),
    heap_maximum_size_(gc::Heap::kDefaultMaximumSize),
    heap_growth_limit_(0),                          // 0 means no growth limit.
    heap_min_free_(gc::Heap::kDefaultMinFree),
    heap_max_free_(gc::Heap::kDefaultMaxFree),
    heap_non_moving_space_capacity_(gc::Heap::kDefaultNonMovingSpaceCapacity),
    large_object_space_type_(gc::Heap::kDefaultLargeObjectSpaceType),
    large_object_threshold_(gc::Heap::kDefaultLargeObjectThreshold),
    heap_target_utilization_(gc::Heap::kDefaultTargetUtilization),
    foreground_heap_growth_multiplier_(gc::Heap::kDefaultHeapGrowthMultiplier),
    parallel_gc_threads_(1),
    conc_gc_threads_(0),                            // Only the main GC thread, no workers.
    collector_type_(                                // The default GC type is set in makefiles.
#if ART_DEFAULT_GC_TYPE_IS_CMS
        gc::kCollectorTypeCMS),
#elif ART_DEFAULT_GC_TYPE_IS_SS
        gc::kCollectorTypeSS),
#elif ART_DEFAULT_GC_TYPE_IS_GSS
    gc::kCollectorTypeGSS),
#else
    gc::kCollectorTypeCMS),
#error "ART default GC type must be set"
#endif
    background_collector_type_(gc::kCollectorTypeNone),
                                                    // If background_collector_type_ is
                                                    // kCollectorTypeNone, it defaults to the
                                                    // collector_type_ after parsing options. If
                                                    // you set this to kCollectorTypeHSpaceCompact
                                                    // then we will do an hspace compaction when
                                                    // we transition to background instead of a
                                                    // normal collector transition.
    stack_size_(0),                                 // 0 means default.
    max_spins_before_thin_lock_inflation_(Monitor::kDefaultMaxSpinsBeforeThinLockInflation),
    low_memory_mode_(false),
    lock_profiling_threshold_(0),
    method_trace_(false),
    method_trace_file_("/data/method-trace-file.bin"),
    method_trace_file_size_(10 * MB),
    hook_is_sensitive_thread_(nullptr),
    hook_vfprintf_(vfprintf),
    hook_exit_(exit),
    hook_abort_(nullptr),                           // We don't call abort(3) by default; see
                                                    // Runtime::Abort.
    profile_clock_source_(kDefaultTraceClockSource),
    verify_(true),
    image_isa_(kRuntimeISA),
    use_homogeneous_space_compaction_for_oom_(true),  // Enable hspace compaction on OOM by default.
    min_interval_homogeneous_space_compaction_by_oom_(MsToNs(100 * 1000)) {  // 100s.
  if (kUseReadBarrier) {
    // If RB is enabled (currently a build-time decision), use CC as the default GC.
    collector_type_ = gc::kCollectorTypeCC;
    background_collector_type_ = gc::kCollectorTypeCC;  // Disable background compaction for CC.
    interpreter_only_ = true;  // Disable the compiler for CC (for now).
    // use_tlab_ = true;
  }
}

ParsedOptions* ParsedOptions::Create(const RuntimeOptions& options, bool ignore_unrecognized) {
  std::unique_ptr<ParsedOptions> parsed(new ParsedOptions());
  if (parsed->Parse(options, ignore_unrecognized)) {
    return parsed.release();
  }
  return nullptr;
}

// Parse a string of the form /[0-9]+[kKmMgG]?/, which is used to specify
// memory sizes.  [kK] indicates kilobytes, [mM] megabytes, and
// [gG] gigabytes.
//
// "s" should point just past the "-Xm?" part of the string.
// "div" specifies a divisor, e.g. 1024 if the value must be a multiple
// of 1024.
//
// The spec says the -Xmx and -Xms options must be multiples of 1024.  It
// doesn't say anything about -Xss.
//
// Returns 0 (a useless size) if "s" is malformed or specifies a low or
// non-evenly-divisible value.
//
size_t ParseMemoryOption(const char* s, size_t div) {
  // strtoul accepts a leading [+-], which we don't want,
  // so make sure our string starts with a decimal digit.
  if (isdigit(*s)) {
    char* s2;
    size_t val = strtoul(s, &s2, 10);
    if (s2 != s) {
      // s2 should be pointing just after the number.
      // If this is the end of the string, the user
      // has specified a number of bytes.  Otherwise,
      // there should be exactly one more character
      // that specifies a multiplier.
      if (*s2 != '\0') {
        // The remainder of the string is either a single multiplier
        // character, or nothing to indicate that the value is in
        // bytes.
        char c = *s2++;
        if (*s2 == '\0') {
          size_t mul;
          if (c == '\0') {
            mul = 1;
          } else if (c == 'k' || c == 'K') {
            mul = KB;
          } else if (c == 'm' || c == 'M') {
            mul = MB;
          } else if (c == 'g' || c == 'G') {
            mul = GB;
          } else {
            // Unknown multiplier character.
            return 0;
          }

          if (val <= std::numeric_limits<size_t>::max() / mul) {
            val *= mul;
          } else {
            // Clamp to a multiple of 1024.
            val = std::numeric_limits<size_t>::max() & ~(1024-1);
          }
        } else {
          // There's more than one character after the numeric part.
          return 0;
        }
      }
      // The man page says that a -Xm value must be a multiple of 1024.
      if (val % div == 0) {
        return val;
      }
    }
  }
  return 0;
}

static gc::CollectorType ParseCollectorType(const std::string& option) {
  if (option == "MS" || option == "nonconcurrent") {
    return gc::kCollectorTypeMS;
  } else if (option == "CMS" || option == "concurrent") {
    return gc::kCollectorTypeCMS;
  } else if (option == "SS") {
    return gc::kCollectorTypeSS;
  } else if (option == "GSS") {
    return gc::kCollectorTypeGSS;
  } else if (option == "CC") {
    return gc::kCollectorTypeCC;
  } else if (option == "MC") {
    return gc::kCollectorTypeMC;
  } else {
    return gc::kCollectorTypeNone;
  }
}

bool ParsedOptions::ParseXGcOption(const std::string& option) {
  std::vector<std::string> gc_options;
  Split(option.substr(strlen("-Xgc:")), ',', &gc_options);
  for (const std::string& gc_option : gc_options) {
    gc::CollectorType collector_type = ParseCollectorType(gc_option);
    if (collector_type != gc::kCollectorTypeNone) {
      collector_type_ = collector_type;
    } else if (gc_option == "preverify") {
      verify_pre_gc_heap_ = true;
    } else if (gc_option == "nopreverify") {
      verify_pre_gc_heap_ = false;
    }  else if (gc_option == "presweepingverify") {
      verify_pre_sweeping_heap_ = true;
    } else if (gc_option == "nopresweepingverify") {
      verify_pre_sweeping_heap_ = false;
    } else if (gc_option == "postverify") {
      verify_post_gc_heap_ = true;
    } else if (gc_option == "nopostverify") {
      verify_post_gc_heap_ = false;
    } else if (gc_option == "preverify_rosalloc") {
      verify_pre_gc_rosalloc_ = true;
    } else if (gc_option == "nopreverify_rosalloc") {
      verify_pre_gc_rosalloc_ = false;
    } else if (gc_option == "presweepingverify_rosalloc") {
      verify_pre_sweeping_rosalloc_ = true;
    } else if (gc_option == "nopresweepingverify_rosalloc") {
      verify_pre_sweeping_rosalloc_ = false;
    } else if (gc_option == "postverify_rosalloc") {
      verify_post_gc_rosalloc_ = true;
    } else if (gc_option == "nopostverify_rosalloc") {
      verify_post_gc_rosalloc_ = false;
    } else if ((gc_option == "precise") ||
               (gc_option == "noprecise") ||
               (gc_option == "verifycardtable") ||
               (gc_option == "noverifycardtable")) {
      // Ignored for backwards compatibility.
    } else {
      Usage("Unknown -Xgc option %s\n", gc_option.c_str());
      return false;
    }
  }
  return true;
}

bool ParsedOptions::Parse(const RuntimeOptions& options, bool ignore_unrecognized) {
  const char* boot_class_path_string = getenv("BOOTCLASSPATH");
  if (boot_class_path_string != NULL) {
    boot_class_path_string_ = boot_class_path_string;
  }
  const char* class_path_string = getenv("CLASSPATH");
  if (class_path_string != NULL) {
    class_path_string_ = class_path_string;
  }

  // Default to number of processors minus one since the main GC thread also does work.
  parallel_gc_threads_ = sysconf(_SC_NPROCESSORS_CONF) - 1;

//  gLogVerbosity.class_linker = true;  // TODO: don't check this in!
//  gLogVerbosity.compiler = true;  // TODO: don't check this in!
//  gLogVerbosity.gc = true;  // TODO: don't check this in!
//  gLogVerbosity.heap = true;  // TODO: don't check this in!
//  gLogVerbosity.jdwp = true;  // TODO: don't check this in!
//  gLogVerbosity.jni = true;  // TODO: don't check this in!
//  gLogVerbosity.monitor = true;  // TODO: don't check this in!
//  gLogVerbosity.profiler = true;  // TODO: don't check this in!
//  gLogVerbosity.signals = true;  // TODO: don't check this in!
//  gLogVerbosity.startup = true;  // TODO: don't check this in!
//  gLogVerbosity.third_party_jni = true;  // TODO: don't check this in!
//  gLogVerbosity.threads = true;  // TODO: don't check this in!
//  gLogVerbosity.verifier = true;  // TODO: don't check this in!

  for (size_t i = 0; i < options.size(); ++i) {
    if (true && options[0].first == "-Xzygote") {
      LOG(INFO) << "option[" << i << "]=" << options[i].first;
    }
  }
  for (size_t i = 0; i < options.size(); ++i) {
    const std::string option(options[i].first);
    if (StartsWith(option, "-help")) {
      Usage(nullptr);
      return false;
    } else if (StartsWith(option, "-showversion")) {
      UsageMessage(stdout, "ART version %s\n", Runtime::GetVersion());
      Exit(0);
    } else if (StartsWith(option, "-Xbootclasspath:")) {
      boot_class_path_string_ = option.substr(strlen("-Xbootclasspath:")).data();
      LOG(INFO) << "setting boot class path to " << boot_class_path_string_;
    } else if (StartsWith(option, "-Xbootclasspath-locations:")) {
      boot_class_path_locations_string_ = option.substr(
          strlen("-Xbootclasspath-locations:")).data();
    } else if (option == "-classpath" || option == "-cp") {
      // TODO: support -Djava.class.path
      i++;
      if (i == options.size()) {
        Usage("Missing required class path value for %s\n", option.c_str());
        return false;
      }
      const StringPiece& value = options[i].first;
      class_path_string_ = value.data();
    } else if (StartsWith(option, "-Ximage:")) {
      if (!ParseStringAfterChar(option, ':', &image_)) {
        return false;
      }
    } else if (StartsWith(option, "-Xcheck:jni")) {
      check_jni_ = true;
    } else if (StartsWith(option, "-Xjniopts:forcecopy")) {
      force_copy_ = true;
    } else if (StartsWith(option, "-Xrunjdwp:") || StartsWith(option, "-agentlib:jdwp=")) {
      std::string tail(option.substr(option[1] == 'X' ? 10 : 15));
      // TODO: move parsing logic out of Dbg
      if (tail == "help" || !Dbg::ParseJdwpOptions(tail)) {
        if (tail != "help") {
          UsageMessage(stderr, "Failed to parse JDWP option %s\n", tail.c_str());
        }
        Usage("Example: -Xrunjdwp:transport=dt_socket,address=8000,server=y\n"
              "Example: -Xrunjdwp:transport=dt_socket,address=localhost:6500,server=n\n");
        return false;
      }
    } else if (StartsWith(option, "-Xms")) {
      size_t size = ParseMemoryOption(option.substr(strlen("-Xms")).c_str(), 1024);
      if (size == 0) {
        Usage("Failed to parse memory option %s\n", option.c_str());
        return false;
      }
      heap_initial_size_ = size;
    } else if (StartsWith(option, "-Xmx")) {
      size_t size = ParseMemoryOption(option.substr(strlen("-Xmx")).c_str(), 1024);
      if (size == 0) {
        Usage("Failed to parse memory option %s\n", option.c_str());
        return false;
      }
      heap_maximum_size_ = size;
    } else if (StartsWith(option, "-XX:HeapGrowthLimit=")) {
      size_t size = ParseMemoryOption(option.substr(strlen("-XX:HeapGrowthLimit=")).c_str(), 1024);
      if (size == 0) {
        Usage("Failed to parse memory option %s\n", option.c_str());
        return false;
      }
      heap_growth_limit_ = size;
    } else if (StartsWith(option, "-XX:HeapMinFree=")) {
      size_t size = ParseMemoryOption(option.substr(strlen("-XX:HeapMinFree=")).c_str(), 1024);
      if (size == 0) {
        Usage("Failed to parse memory option %s\n", option.c_str());
        return false;
      }
      heap_min_free_ = size;
    } else if (StartsWith(option, "-XX:HeapMaxFree=")) {
      size_t size = ParseMemoryOption(option.substr(strlen("-XX:HeapMaxFree=")).c_str(), 1024);
      if (size == 0) {
        Usage("Failed to parse memory option %s\n", option.c_str());
        return false;
      }
      heap_max_free_ = size;
    } else if (StartsWith(option, "-XX:NonMovingSpaceCapacity=")) {
      size_t size = ParseMemoryOption(
          option.substr(strlen("-XX:NonMovingSpaceCapacity=")).c_str(), 1024);
      if (size == 0) {
        Usage("Failed to parse memory option %s\n", option.c_str());
        return false;
      }
      heap_non_moving_space_capacity_ = size;
    } else if (StartsWith(option, "-XX:HeapTargetUtilization=")) {
      if (!ParseDouble(option, '=', 0.1, 0.9, &heap_target_utilization_)) {
        return false;
      }
    } else if (StartsWith(option, "-XX:ForegroundHeapGrowthMultiplier=")) {
      if (!ParseDouble(option, '=', 0.1, 10.0, &foreground_heap_growth_multiplier_)) {
        return false;
      }
    } else if (StartsWith(option, "-XX:ParallelGCThreads=")) {
      if (!ParseUnsignedInteger(option, '=', &parallel_gc_threads_)) {
        return false;
      }
    } else if (StartsWith(option, "-XX:ConcGCThreads=")) {
      if (!ParseUnsignedInteger(option, '=', &conc_gc_threads_)) {
        return false;
      }
    } else if (StartsWith(option, "-Xss")) {
      size_t size = ParseMemoryOption(option.substr(strlen("-Xss")).c_str(), 1);
      if (size == 0) {
        Usage("Failed to parse memory option %s\n", option.c_str());
        return false;
      }
      stack_size_ = size;
    } else if (StartsWith(option, "-XX:MaxSpinsBeforeThinLockInflation=")) {
      if (!ParseUnsignedInteger(option, '=', &max_spins_before_thin_lock_inflation_)) {
        return false;
      }
    } else if (StartsWith(option, "-XX:LongPauseLogThreshold=")) {
      unsigned int value;
      if (!ParseUnsignedInteger(option, '=', &value)) {
        return false;
      }
      long_pause_log_threshold_ = MsToNs(value);
    } else if (StartsWith(option, "-XX:LongGCLogThreshold=")) {
      unsigned int value;
      if (!ParseUnsignedInteger(option, '=', &value)) {
        return false;
      }
      long_gc_log_threshold_ = MsToNs(value);
    } else if (option == "-XX:DumpGCPerformanceOnShutdown") {
      dump_gc_performance_on_shutdown_ = true;
    } else if (option == "-XX:IgnoreMaxFootprint") {
      ignore_max_footprint_ = true;
    } else if (option == "-XX:LowMemoryMode") {
      low_memory_mode_ = true;
      // TODO Might want to turn off must_relocate here.
    } else if (option == "-XX:UseTLAB") {
      use_tlab_ = true;
    } else if (option == "-XX:EnableHSpaceCompactForOOM") {
      use_homogeneous_space_compaction_for_oom_ = true;
    } else if (option == "-XX:DisableHSpaceCompactForOOM") {
      use_homogeneous_space_compaction_for_oom_ = false;
    } else if (StartsWith(option, "-XX:HspaceCompactForOOMMinIntervalMs=")) {
      unsigned int value;
      if (!ParseUnsignedInteger(option, '=', &value)) {
        return false;
      }
      min_interval_homogeneous_space_compaction_by_oom_ = MsToNs(value);
    } else if (StartsWith(option, "-D")) {
      properties_.push_back(option.substr(strlen("-D")));
    } else if (StartsWith(option, "-Xjnitrace:")) {
      jni_trace_ = option.substr(strlen("-Xjnitrace:"));
    } else if (option == "compilercallbacks") {
      compiler_callbacks_ =
          reinterpret_cast<CompilerCallbacks*>(const_cast<void*>(options[i].second));
    } else if (option == "imageinstructionset") {
      const char* isa_str = reinterpret_cast<const char*>(options[i].second);
      image_isa_ = GetInstructionSetFromString(isa_str);
      if (image_isa_ == kNone) {
        Usage("%s is not a valid instruction set.", isa_str);
        return false;
      }
    } else if (option == "-Xzygote") {
      is_zygote_ = true;
    } else if (StartsWith(option, "-Xpatchoat:")) {
      if (!ParseStringAfterChar(option, ':', &patchoat_executable_)) {
        return false;
      }
    } else if (option == "-Xrelocate") {
      must_relocate_ = true;
    } else if (option == "-Xnorelocate") {
      must_relocate_ = false;
    } else if (option == "-Xnodex2oat") {
      dex2oat_enabled_ = false;
    } else if (option == "-Xdex2oat") {
      dex2oat_enabled_ = true;
    } else if (option == "-Xnoimage-dex2oat") {
      image_dex2oat_enabled_ = false;
    } else if (option == "-Ximage-dex2oat") {
      image_dex2oat_enabled_ = true;
    } else if (option == "-Xint") {
      interpreter_only_ = true;
    } else if (StartsWith(option, "-Xgc:")) {
      if (!ParseXGcOption(option)) {
        return false;
      }
    } else if (StartsWith(option, "-XX:LargeObjectSpace=")) {
      std::string substring;
      if (!ParseStringAfterChar(option, '=', &substring)) {
        return false;
      }
      if (substring == "disabled") {
        large_object_space_type_ = gc::space::kLargeObjectSpaceTypeDisabled;
      } else if (substring == "freelist") {
        large_object_space_type_ = gc::space::kLargeObjectSpaceTypeFreeList;
      } else if (substring == "map") {
        large_object_space_type_ = gc::space::kLargeObjectSpaceTypeMap;
      } else {
        Usage("Unknown -XX:LargeObjectSpace= option %s\n", substring.c_str());
        return false;
      }
    } else if (StartsWith(option, "-XX:LargeObjectThreshold=")) {
      std::string substring;
      if (!ParseStringAfterChar(option, '=', &substring)) {
        return false;
      }
      size_t size = ParseMemoryOption(substring.c_str(), 1);
      if (size == 0) {
        Usage("Failed to parse memory option %s\n", option.c_str());
        return false;
      }
      large_object_threshold_ = size;
    } else if (StartsWith(option, "-XX:BackgroundGC=")) {
      std::string substring;
      if (!ParseStringAfterChar(option, '=', &substring)) {
        return false;
      }
      // Special handling for HSpaceCompact since this is only valid as a background GC type.
      if (substring == "HSpaceCompact") {
        background_collector_type_ = gc::kCollectorTypeHomogeneousSpaceCompact;
      } else {
        gc::CollectorType collector_type = ParseCollectorType(substring);
        if (collector_type != gc::kCollectorTypeNone) {
          background_collector_type_ = collector_type;
        } else {
          Usage("Unknown -XX:BackgroundGC option %s\n", substring.c_str());
          return false;
        }
      }
    } else if (option == "-XX:+DisableExplicitGC") {
      is_explicit_gc_disabled_ = true;
    } else if (StartsWith(option, "-verbose:")) {
      std::vector<std::string> verbose_options;
      Split(option.substr(strlen("-verbose:")), ',', &verbose_options);
      for (size_t j = 0; j < verbose_options.size(); ++j) {
        if (verbose_options[j] == "class") {
          gLogVerbosity.class_linker = true;
        } else if (verbose_options[j] == "compiler") {
          gLogVerbosity.compiler = true;
        } else if (verbose_options[j] == "gc") {
          gLogVerbosity.gc = true;
        } else if (verbose_options[j] == "heap") {
          gLogVerbosity.heap = true;
        } else if (verbose_options[j] == "jdwp") {
          gLogVerbosity.jdwp = true;
        } else if (verbose_options[j] == "jni") {
          gLogVerbosity.jni = true;
        } else if (verbose_options[j] == "monitor") {
          gLogVerbosity.monitor = true;
        } else if (verbose_options[j] == "profiler") {
          gLogVerbosity.profiler = true;
        } else if (verbose_options[j] == "signals") {
          gLogVerbosity.signals = true;
        } else if (verbose_options[j] == "startup") {
          gLogVerbosity.startup = true;
        } else if (verbose_options[j] == "third-party-jni") {
          gLogVerbosity.third_party_jni = true;
        } else if (verbose_options[j] == "threads") {
          gLogVerbosity.threads = true;
        } else if (verbose_options[j] == "verifier") {
          gLogVerbosity.verifier = true;
        } else {
          Usage("Unknown -verbose option %s\n", verbose_options[j].c_str());
          return false;
        }
      }
    } else if (StartsWith(option, "-Xlockprofthreshold:")) {
      if (!ParseUnsignedInteger(option, ':', &lock_profiling_threshold_)) {
        return false;
      }
    } else if (StartsWith(option, "-Xstacktracefile:")) {
      if (!ParseStringAfterChar(option, ':', &stack_trace_file_)) {
        return false;
      }
    } else if (option == "sensitiveThread") {
      const void* hook = options[i].second;
      hook_is_sensitive_thread_ = reinterpret_cast<bool (*)()>(const_cast<void*>(hook));
    } else if (option == "vfprintf") {
      const void* hook = options[i].second;
      if (hook == nullptr) {
        Usage("vfprintf argument was NULL");
        return false;
      }
      hook_vfprintf_ =
          reinterpret_cast<int (*)(FILE *, const char*, va_list)>(const_cast<void*>(hook));
    } else if (option == "exit") {
      const void* hook = options[i].second;
      if (hook == nullptr) {
        Usage("exit argument was NULL");
        return false;
      }
      hook_exit_ = reinterpret_cast<void(*)(jint)>(const_cast<void*>(hook));
    } else if (option == "abort") {
      const void* hook = options[i].second;
      if (hook == nullptr) {
        Usage("abort was NULL\n");
        return false;
      }
      hook_abort_ = reinterpret_cast<void(*)()>(const_cast<void*>(hook));
    } else if (option == "-Xmethod-trace") {
      method_trace_ = true;
    } else if (StartsWith(option, "-Xmethod-trace-file:")) {
      method_trace_file_ = option.substr(strlen("-Xmethod-trace-file:"));
    } else if (StartsWith(option, "-Xmethod-trace-file-size:")) {
      if (!ParseUnsignedInteger(option, ':', &method_trace_file_size_)) {
        return false;
      }
    } else if (option == "-Xprofile:threadcpuclock") {
      Trace::SetDefaultClockSource(kTraceClockSourceThreadCpu);
    } else if (option == "-Xprofile:wallclock") {
      Trace::SetDefaultClockSource(kTraceClockSourceWall);
    } else if (option == "-Xprofile:dualclock") {
      Trace::SetDefaultClockSource(kTraceClockSourceDual);
    } else if (option == "-Xenable-profiler") {
      profiler_options_.enabled_ = true;
    } else if (StartsWith(option, "-Xprofile-filename:")) {
      if (!ParseStringAfterChar(option, ':', &profile_output_filename_)) {
        return false;
      }
    } else if (StartsWith(option, "-Xprofile-period:")) {
      if (!ParseUnsignedInteger(option, ':', &profiler_options_.period_s_)) {
        return false;
      }
    } else if (StartsWith(option, "-Xprofile-duration:")) {
      if (!ParseUnsignedInteger(option, ':', &profiler_options_.duration_s_)) {
        return false;
      }
    } else if (StartsWith(option, "-Xprofile-interval:")) {
      if (!ParseUnsignedInteger(option, ':', &profiler_options_.interval_us_)) {
        return false;
      }
    } else if (StartsWith(option, "-Xprofile-backoff:")) {
      if (!ParseDouble(option, ':', 1.0, 10.0, &profiler_options_.backoff_coefficient_)) {
        return false;
      }
    } else if (option == "-Xprofile-start-immediately") {
      profiler_options_.start_immediately_ = true;
    } else if (StartsWith(option, "-Xprofile-top-k-threshold:")) {
      if (!ParseDouble(option, ':', 0.0, 100.0, &profiler_options_.top_k_threshold_)) {
        return false;
      }
    } else if (StartsWith(option, "-Xprofile-top-k-change-threshold:")) {
      if (!ParseDouble(option, ':', 0.0, 100.0, &profiler_options_.top_k_change_threshold_)) {
        return false;
      }
    } else if (option == "-Xprofile-type:method") {
      profiler_options_.profile_type_ = kProfilerMethod;
    } else if (option == "-Xprofile-type:stack") {
      profiler_options_.profile_type_ = kProfilerBoundedStack;
    } else if (StartsWith(option, "-Xprofile-max-stack-depth:")) {
      if (!ParseUnsignedInteger(option, ':', &profiler_options_.max_stack_depth_)) {
        return false;
      }
    } else if (StartsWith(option, "-Xcompiler:")) {
      if (!ParseStringAfterChar(option, ':', &compiler_executable_)) {
        return false;
      }
    } else if (option == "-Xcompiler-option") {
      i++;
      if (i == options.size()) {
        Usage("Missing required compiler option for %s\n", option.c_str());
        return false;
      }
      compiler_options_.push_back(options[i].first);
    } else if (option == "-Ximage-compiler-option") {
      i++;
      if (i == options.size()) {
        Usage("Missing required compiler option for %s\n", option.c_str());
        return false;
      }
      image_compiler_options_.push_back(options[i].first);
    } else if (StartsWith(option, "-Xverify:")) {
      std::string verify_mode = option.substr(strlen("-Xverify:"));
      if (verify_mode == "none") {
        verify_ = false;
      } else if (verify_mode == "remote" || verify_mode == "all") {
        verify_ = true;
      } else {
        Usage("Unknown -Xverify option %s\n", verify_mode.c_str());
        return false;
      }
    } else if (StartsWith(option, "-XX:NativeBridge=")) {
      if (!ParseStringAfterChar(option, '=', &native_bridge_library_filename_)) {
        return false;
      }
    } else if (StartsWith(option, "-ea") ||
               StartsWith(option, "-da") ||
               StartsWith(option, "-enableassertions") ||
               StartsWith(option, "-disableassertions") ||
               (option == "--runtime-arg") ||
               (option == "-esa") ||
               (option == "-dsa") ||
               (option == "-enablesystemassertions") ||
               (option == "-disablesystemassertions") ||
               (option == "-Xrs") ||
               StartsWith(option, "-Xint:") ||
               StartsWith(option, "-Xdexopt:") ||
               (option == "-Xnoquithandler") ||
               StartsWith(option, "-Xjnigreflimit:") ||
               (option == "-Xgenregmap") ||
               (option == "-Xnogenregmap") ||
               StartsWith(option, "-Xverifyopt:") ||
               (option == "-Xcheckdexsum") ||
               (option == "-Xincludeselectedop") ||
               StartsWith(option, "-Xjitop:") ||
               (option == "-Xincludeselectedmethod") ||
               StartsWith(option, "-Xjitthreshold:") ||
               StartsWith(option, "-Xjitcodecachesize:") ||
               (option == "-Xjitblocking") ||
               StartsWith(option, "-Xjitmethod:") ||
               StartsWith(option, "-Xjitclass:") ||
               StartsWith(option, "-Xjitoffset:") ||
               StartsWith(option, "-Xjitconfig:") ||
               (option == "-Xjitcheckcg") ||
               (option == "-Xjitverbose") ||
               (option == "-Xjitprofile") ||
               (option == "-Xjitdisableopt") ||
               (option == "-Xjitsuspendpoll") ||
               StartsWith(option, "-XX:mainThreadStackSize=")) {
      // Ignored for backwards compatibility.
    } else if (!ignore_unrecognized) {
      Usage("Unrecognized option %s\n", option.c_str());
      return false;
    }
  }
  // If not set, background collector type defaults to homogeneous compaction.
  // If foreground is GSS, use GSS as background collector.
  // If not low memory mode, semispace otherwise.
  if (background_collector_type_ == gc::kCollectorTypeNone) {
    if (collector_type_ != gc::kCollectorTypeGSS) {
      background_collector_type_ = low_memory_mode_ ?
          gc::kCollectorTypeSS : gc::kCollectorTypeHomogeneousSpaceCompact;
    } else {
      background_collector_type_ = collector_type_;
    }
  }

  // If a reference to the dalvik core.jar snuck in, replace it with
  // the art specific version. This can happen with on device
  // boot.art/boot.oat generation by GenerateImage which relies on the
  // value of BOOTCLASSPATH.
#if defined(ART_TARGET)
  std::string core_jar("/core.jar");
  std::string core_libart_jar("/core-libart.jar");
#else
  // The host uses hostdex files.
  std::string core_jar("/core-hostdex.jar");
  std::string core_libart_jar("/core-libart-hostdex.jar");
#endif
  size_t core_jar_pos = boot_class_path_string_.find(core_jar);
  if (core_jar_pos != std::string::npos) {
    boot_class_path_string_.replace(core_jar_pos, core_jar.size(), core_libart_jar);
  }

  if (!boot_class_path_locations_string_.empty()) {
    std::vector<std::string> files;
    Split(boot_class_path_string_, ':', &files);

    std::vector<std::string> locations;
    Split(boot_class_path_locations_string_, ':', &locations);

    if (files.size() != locations.size()) {
      Usage("The number of boot class path files does not match"
          " the number of boot class path locations given\n"
          "  boot class path files     (%zu): %s\n"
          "  boot class path locations (%zu): %s\n",
          files.size(), boot_class_path_string_.c_str(),
          locations.size(), boot_class_path_locations_string_.c_str());
      return false;
    }
  }

  if (compiler_callbacks_ == nullptr && image_.empty()) {
    image_ += GetAndroidRoot();
    image_ += "/framework/boot.art";
  }
  if (heap_growth_limit_ == 0) {
    heap_growth_limit_ = heap_maximum_size_;
  }
  return true;
}  // NOLINT(readability/fn_size)

void ParsedOptions::Exit(int status) {
  hook_exit_(status);
}

void ParsedOptions::Abort() {
  hook_abort_();
}

void ParsedOptions::UsageMessageV(FILE* stream, const char* fmt, va_list ap) {
  hook_vfprintf_(stream, fmt, ap);
}

void ParsedOptions::UsageMessage(FILE* stream, const char* fmt, ...) {
  va_list ap;
  va_start(ap, fmt);
  UsageMessageV(stream, fmt, ap);
  va_end(ap);
}

void ParsedOptions::Usage(const char* fmt, ...) {
  bool error = (fmt != nullptr);
  FILE* stream = error ? stderr : stdout;

  if (fmt != nullptr) {
    va_list ap;
    va_start(ap, fmt);
    UsageMessageV(stream, fmt, ap);
    va_end(ap);
  }

  const char* program = "dalvikvm";
  UsageMessage(stream, "%s: [options] class [argument ...]\n", program);
  UsageMessage(stream, "\n");
  UsageMessage(stream, "The following standard options are supported:\n");
  UsageMessage(stream, "  -classpath classpath (-cp classpath)\n");
  UsageMessage(stream, "  -Dproperty=value\n");
  UsageMessage(stream, "  -verbose:tag ('gc', 'jni', or 'class')\n");
  UsageMessage(stream, "  -showversion\n");
  UsageMessage(stream, "  -help\n");
  UsageMessage(stream, "  -agentlib:jdwp=options\n");
  UsageMessage(stream, "\n");

  UsageMessage(stream, "The following extended options are supported:\n");
  UsageMessage(stream, "  -Xrunjdwp:<options>\n");
  UsageMessage(stream, "  -Xbootclasspath:bootclasspath\n");
  UsageMessage(stream, "  -Xcheck:tag  (e.g. 'jni')\n");
  UsageMessage(stream, "  -XmsN (min heap, must be multiple of 1K, >= 1MB)\n");
  UsageMessage(stream, "  -XmxN (max heap, must be multiple of 1K, >= 2MB)\n");
  UsageMessage(stream, "  -XssN (stack size)\n");
  UsageMessage(stream, "  -Xint\n");
  UsageMessage(stream, "\n");

  UsageMessage(stream, "The following Dalvik options are supported:\n");
  UsageMessage(stream, "  -Xzygote\n");
  UsageMessage(stream, "  -Xjnitrace:substring (eg NativeClass or nativeMethod)\n");
  UsageMessage(stream, "  -Xstacktracefile:<filename>\n");
  UsageMessage(stream, "  -Xgc:[no]preverify\n");
  UsageMessage(stream, "  -Xgc:[no]postverify\n");
  UsageMessage(stream, "  -XX:HeapGrowthLimit=N\n");
  UsageMessage(stream, "  -XX:HeapMinFree=N\n");
  UsageMessage(stream, "  -XX:HeapMaxFree=N\n");
  UsageMessage(stream, "  -XX:NonMovingSpaceCapacity=N\n");
  UsageMessage(stream, "  -XX:HeapTargetUtilization=doublevalue\n");
  UsageMessage(stream, "  -XX:ForegroundHeapGrowthMultiplier=doublevalue\n");
  UsageMessage(stream, "  -XX:LowMemoryMode\n");
  UsageMessage(stream, "  -Xprofile:{threadcpuclock,wallclock,dualclock}\n");
  UsageMessage(stream, "\n");

  UsageMessage(stream, "The following unique to ART options are supported:\n");
  UsageMessage(stream, "  -Xgc:[no]preverify_rosalloc\n");
  UsageMessage(stream, "  -Xgc:[no]postsweepingverify_rosalloc\n");
  UsageMessage(stream, "  -Xgc:[no]postverify_rosalloc\n");
  UsageMessage(stream, "  -Xgc:[no]presweepingverify\n");
  UsageMessage(stream, "  -Ximage:filename\n");
  UsageMessage(stream, "  -Xbootclasspath-locations:bootclasspath\n"
      "     (override the dex locations of the -Xbootclasspath files)\n");
  UsageMessage(stream, "  -XX:+DisableExplicitGC\n");
  UsageMessage(stream, "  -XX:ParallelGCThreads=integervalue\n");
  UsageMessage(stream, "  -XX:ConcGCThreads=integervalue\n");
  UsageMessage(stream, "  -XX:MaxSpinsBeforeThinLockInflation=integervalue\n");
  UsageMessage(stream, "  -XX:LongPauseLogThreshold=integervalue\n");
  UsageMessage(stream, "  -XX:LongGCLogThreshold=integervalue\n");
  UsageMessage(stream, "  -XX:DumpGCPerformanceOnShutdown\n");
  UsageMessage(stream, "  -XX:IgnoreMaxFootprint\n");
  UsageMessage(stream, "  -XX:UseTLAB\n");
  UsageMessage(stream, "  -XX:BackgroundGC=none\n");
  UsageMessage(stream, "  -XX:LargeObjectSpace={disabled,map,freelist}\n");
  UsageMessage(stream, "  -XX:LargeObjectThreshold=N\n");
  UsageMessage(stream, "  -Xmethod-trace\n");
  UsageMessage(stream, "  -Xmethod-trace-file:filename");
  UsageMessage(stream, "  -Xmethod-trace-file-size:integervalue\n");
  UsageMessage(stream, "  -Xenable-profiler\n");
  UsageMessage(stream, "  -Xprofile-filename:filename\n");
  UsageMessage(stream, "  -Xprofile-period:integervalue\n");
  UsageMessage(stream, "  -Xprofile-duration:integervalue\n");
  UsageMessage(stream, "  -Xprofile-interval:integervalue\n");
  UsageMessage(stream, "  -Xprofile-backoff:doublevalue\n");
  UsageMessage(stream, "  -Xprofile-start-immediately\n");
  UsageMessage(stream, "  -Xprofile-top-k-threshold:doublevalue\n");
  UsageMessage(stream, "  -Xprofile-top-k-change-threshold:doublevalue\n");
  UsageMessage(stream, "  -Xprofile-type:{method,stack}\n");
  UsageMessage(stream, "  -Xprofile-max-stack-depth:integervalue\n");
  UsageMessage(stream, "  -Xcompiler:filename\n");
  UsageMessage(stream, "  -Xcompiler-option dex2oat-option\n");
  UsageMessage(stream, "  -Ximage-compiler-option dex2oat-option\n");
  UsageMessage(stream, "  -Xpatchoat:filename\n");
  UsageMessage(stream, "  -X[no]relocate\n");
  UsageMessage(stream, "  -X[no]dex2oat (Whether to invoke dex2oat on the application)\n");
  UsageMessage(stream, "  -X[no]image-dex2oat (Whether to create and use a boot image)\n");
  UsageMessage(stream, "\n");

  UsageMessage(stream, "The following previously supported Dalvik options are ignored:\n");
  UsageMessage(stream, "  -ea[:<package name>... |:<class name>]\n");
  UsageMessage(stream, "  -da[:<package name>... |:<class name>]\n");
  UsageMessage(stream, "   (-enableassertions, -disableassertions)\n");
  UsageMessage(stream, "  -esa\n");
  UsageMessage(stream, "  -dsa\n");
  UsageMessage(stream, "   (-enablesystemassertions, -disablesystemassertions)\n");
  UsageMessage(stream, "  -Xverify:{none,remote,all}\n");
  UsageMessage(stream, "  -Xrs\n");
  UsageMessage(stream, "  -Xint:portable, -Xint:fast, -Xint:jit\n");
  UsageMessage(stream, "  -Xdexopt:{none,verified,all,full}\n");
  UsageMessage(stream, "  -Xnoquithandler\n");
  UsageMessage(stream, "  -Xjniopts:{warnonly,forcecopy}\n");
  UsageMessage(stream, "  -Xjnigreflimit:integervalue\n");
  UsageMessage(stream, "  -Xgc:[no]precise\n");
  UsageMessage(stream, "  -Xgc:[no]verifycardtable\n");
  UsageMessage(stream, "  -X[no]genregmap\n");
  UsageMessage(stream, "  -Xverifyopt:[no]checkmon\n");
  UsageMessage(stream, "  -Xcheckdexsum\n");
  UsageMessage(stream, "  -Xincludeselectedop\n");
  UsageMessage(stream, "  -Xjitop:hexopvalue[-endvalue][,hexopvalue[-endvalue]]*\n");
  UsageMessage(stream, "  -Xincludeselectedmethod\n");
  UsageMessage(stream, "  -Xjitthreshold:integervalue\n");
  UsageMessage(stream, "  -Xjitcodecachesize:decimalvalueofkbytes\n");
  UsageMessage(stream, "  -Xjitblocking\n");
  UsageMessage(stream, "  -Xjitmethod:signature[,signature]* (eg Ljava/lang/String\\;replace)\n");
  UsageMessage(stream, "  -Xjitclass:classname[,classname]*\n");
  UsageMessage(stream, "  -Xjitoffset:offset[,offset]\n");
  UsageMessage(stream, "  -Xjitconfig:filename\n");
  UsageMessage(stream, "  -Xjitcheckcg\n");
  UsageMessage(stream, "  -Xjitverbose\n");
  UsageMessage(stream, "  -Xjitprofile\n");
  UsageMessage(stream, "  -Xjitdisableopt\n");
  UsageMessage(stream, "  -Xjitsuspendpoll\n");
  UsageMessage(stream, "  -XX:mainThreadStackSize=N\n");
  UsageMessage(stream, "\n");

  Exit((error) ? 1 : 0);
}

bool ParsedOptions::ParseStringAfterChar(const std::string& s, char c, std::string* parsed_value) {
  std::string::size_type colon = s.find(c);
  if (colon == std::string::npos) {
    Usage("Missing char %c in option %s\n", c, s.c_str());
    return false;
  }
  // Add one to remove the char we were trimming until.
  *parsed_value = s.substr(colon + 1);
  return true;
}

bool ParsedOptions::ParseInteger(const std::string& s, char after_char, int* parsed_value) {
  std::string::size_type colon = s.find(after_char);
  if (colon == std::string::npos) {
    Usage("Missing char %c in option %s\n", after_char, s.c_str());
    return false;
  }
  const char* begin = &s[colon + 1];
  char* end;
  size_t result = strtoul(begin, &end, 10);
  if (begin == end || *end != '\0') {
    Usage("Failed to parse integer from %s\n", s.c_str());
    return false;
  }
  *parsed_value = result;
  return true;
}

bool ParsedOptions::ParseUnsignedInteger(const std::string& s, char after_char,
                                         unsigned int* parsed_value) {
  int i;
  if (!ParseInteger(s, after_char, &i)) {
    return false;
  }
  if (i < 0) {
    Usage("Negative value %d passed for unsigned option %s\n", i, s.c_str());
    return false;
  }
  *parsed_value = i;
  return true;
}

bool ParsedOptions::ParseDouble(const std::string& option, char after_char,
                                double min, double max, double* parsed_value) {
  std::string substring;
  if (!ParseStringAfterChar(option, after_char, &substring)) {
    return false;
  }
  bool sane_val = true;
  double value;
  if ((false)) {
    // TODO: this doesn't seem to work on the emulator.  b/15114595
    std::stringstream iss(substring);
    iss >> value;
    // Ensure that we have a value, there was no cruft after it and it satisfies a sensible range.
    sane_val = iss.eof() && (value >= min) && (value <= max);
  } else {
    char* end = nullptr;
    value = strtod(substring.c_str(), &end);
    sane_val = *end == '\0' && value >= min && value <= max;
  }
  if (!sane_val) {
    Usage("Invalid double value %s for option %s\n", substring.c_str(), option.c_str());
    return false;
  }
  *parsed_value = value;
  return true;
}

}  // namespace art