arguments.cpp 152.4 KB
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/*
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 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
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 *
 */

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#include "precompiled.hpp"
#include "classfile/javaAssertions.hpp"
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#include "classfile/symbolTable.hpp"
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#include "compiler/compilerOracle.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/cardTableRS.hpp"
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#include "memory/genCollectedHeap.hpp"
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#include "memory/referenceProcessor.hpp"
#include "memory/universe.inline.hpp"
#include "oops/oop.inline.hpp"
#include "prims/jvmtiExport.hpp"
#include "runtime/arguments.hpp"
#include "runtime/globals_extension.hpp"
#include "runtime/java.hpp"
#include "services/management.hpp"
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#include "services/memTracker.hpp"
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#include "utilities/defaultStream.hpp"
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#include "utilities/macros.hpp"
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#include "utilities/taskqueue.hpp"
#ifdef TARGET_OS_FAMILY_linux
# include "os_linux.inline.hpp"
#endif
#ifdef TARGET_OS_FAMILY_solaris
# include "os_solaris.inline.hpp"
#endif
#ifdef TARGET_OS_FAMILY_windows
# include "os_windows.inline.hpp"
#endif
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#ifdef TARGET_OS_FAMILY_aix
# include "os_aix.inline.hpp"
#endif
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#ifdef TARGET_OS_FAMILY_bsd
# include "os_bsd.inline.hpp"
#endif
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#if INCLUDE_ALL_GCS
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#include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
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#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
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#endif // INCLUDE_ALL_GCS
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// Note: This is a special bug reporting site for the JVM
#define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
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#define DEFAULT_JAVA_LAUNCHER  "generic"

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// Disable options not supported in this release, with a warning if they
// were explicitly requested on the command-line
#define UNSUPPORTED_OPTION(opt, description)                    \
do {                                                            \
  if (opt) {                                                    \
    if (FLAG_IS_CMDLINE(opt)) {                                 \
      warning(description " is disabled in this release.");     \
    }                                                           \
    FLAG_SET_DEFAULT(opt, false);                               \
  }                                                             \
} while(0)

#define UNSUPPORTED_GC_OPTION(gc)                                     \
do {                                                                  \
  if (gc) {                                                           \
    if (FLAG_IS_CMDLINE(gc)) {                                        \
      warning(#gc " is not supported in this VM.  Using Serial GC."); \
    }                                                                 \
    FLAG_SET_DEFAULT(gc, false);                                      \
  }                                                                   \
} while(0)

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char**  Arguments::_jvm_flags_array             = NULL;
int     Arguments::_num_jvm_flags               = 0;
char**  Arguments::_jvm_args_array              = NULL;
int     Arguments::_num_jvm_args                = 0;
char*  Arguments::_java_command                 = NULL;
SystemProperty* Arguments::_system_properties   = NULL;
const char*  Arguments::_gc_log_filename        = NULL;
bool   Arguments::_has_profile                  = false;
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size_t Arguments::_conservative_max_heap_alignment = 0;
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uintx  Arguments::_min_heap_size                = 0;
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uintx  Arguments::_min_heap_free_ratio          = 0;
uintx  Arguments::_max_heap_free_ratio          = 0;
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Arguments::Mode Arguments::_mode                = _mixed;
bool   Arguments::_java_compiler                = false;
bool   Arguments::_xdebug_mode                  = false;
const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
int    Arguments::_sun_java_launcher_pid        = -1;
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bool   Arguments::_created_by_gamma_launcher    = false;
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// These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
bool   Arguments::_ClipInlining                 = ClipInlining;

char*  Arguments::SharedArchivePath             = NULL;

AgentLibraryList Arguments::_libraryList;
AgentLibraryList Arguments::_agentList;

abort_hook_t     Arguments::_abort_hook         = NULL;
exit_hook_t      Arguments::_exit_hook          = NULL;
vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;


SystemProperty *Arguments::_java_ext_dirs = NULL;
SystemProperty *Arguments::_java_endorsed_dirs = NULL;
SystemProperty *Arguments::_sun_boot_library_path = NULL;
SystemProperty *Arguments::_java_library_path = NULL;
SystemProperty *Arguments::_java_home = NULL;
SystemProperty *Arguments::_java_class_path = NULL;
SystemProperty *Arguments::_sun_boot_class_path = NULL;

char* Arguments::_meta_index_path = NULL;
char* Arguments::_meta_index_dir = NULL;

// Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string

static bool match_option(const JavaVMOption *option, const char* name,
                         const char** tail) {
  int len = (int)strlen(name);
  if (strncmp(option->optionString, name, len) == 0) {
    *tail = option->optionString + len;
    return true;
  } else {
    return false;
  }
}

static void logOption(const char* opt) {
  if (PrintVMOptions) {
    jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
  }
}

// Process java launcher properties.
void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
  // See if sun.java.launcher or sun.java.launcher.pid is defined.
  // Must do this before setting up other system properties,
  // as some of them may depend on launcher type.
  for (int index = 0; index < args->nOptions; index++) {
    const JavaVMOption* option = args->options + index;
    const char* tail;

    if (match_option(option, "-Dsun.java.launcher=", &tail)) {
      process_java_launcher_argument(tail, option->extraInfo);
      continue;
    }
    if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
      _sun_java_launcher_pid = atoi(tail);
      continue;
    }
  }
}

// Initialize system properties key and value.
void Arguments::init_system_properties() {

  PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
                                                                 "Java Virtual Machine Specification",  false));
  PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
  PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
  PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));

  // following are JVMTI agent writeable properties.
  // Properties values are set to NULL and they are
  // os specific they are initialized in os::init_system_properties_values().
  _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL,  true);
  _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL,  true);
  _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
  _java_library_path = new SystemProperty("java.library.path", NULL,  true);
  _java_home =  new SystemProperty("java.home", NULL,  true);
  _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);

  _java_class_path = new SystemProperty("java.class.path", "",  true);

  // Add to System Property list.
  PropertyList_add(&_system_properties, _java_ext_dirs);
  PropertyList_add(&_system_properties, _java_endorsed_dirs);
  PropertyList_add(&_system_properties, _sun_boot_library_path);
  PropertyList_add(&_system_properties, _java_library_path);
  PropertyList_add(&_system_properties, _java_home);
  PropertyList_add(&_system_properties, _java_class_path);
  PropertyList_add(&_system_properties, _sun_boot_class_path);

  // Set OS specific system properties values
  os::init_system_properties_values();
}

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  // Update/Initialize System properties after JDK version number is known
void Arguments::init_version_specific_system_properties() {
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  enum { bufsz = 16 };
  char buffer[bufsz];
  const char* spec_vendor = "Sun Microsystems Inc.";
  uint32_t spec_version = 0;

  if (JDK_Version::is_gte_jdk17x_version()) {
    spec_vendor = "Oracle Corporation";
    spec_version = JDK_Version::current().major_version();
  }
  jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);

  PropertyList_add(&_system_properties,
      new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
  PropertyList_add(&_system_properties,
      new SystemProperty("java.vm.specification.version", buffer, false));
  PropertyList_add(&_system_properties,
      new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
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}

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/**
 * Provide a slightly more user-friendly way of eliminating -XX flags.
 * When a flag is eliminated, it can be added to this list in order to
 * continue accepting this flag on the command-line, while issuing a warning
 * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 * limit, we flatly refuse to admit the existence of the flag.  This allows
 * a flag to die correctly over JDK releases using HSX.
 */
typedef struct {
  const char* name;
  JDK_Version obsoleted_in; // when the flag went away
  JDK_Version accept_until; // which version to start denying the existence
} ObsoleteFlag;

static ObsoleteFlag obsolete_jvm_flags[] = {
  { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
  { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
  { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
  { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
  { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
  { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
  { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
  { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
  { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
  { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
  { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
  { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
  { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
  { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
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  { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
  { "DefaultInitialRAMFraction",
                           JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
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  { "UseDepthFirstScavengeOrder",
                           JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
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  { "HandlePromotionFailure",
                           JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
  { "MaxLiveObjectEvacuationRatio",
                           JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
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  { "ForceSharedSpaces",   JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
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  { "UseParallelOldGCCompacting",
                           JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
  { "UseParallelDensePrefixUpdate",
                           JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
  { "UseParallelOldGCDensePrefix",
                           JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
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  { "AllowTransitionalJSR292",       JDK_Version::jdk(7), JDK_Version::jdk(8) },
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  { "UseCompressedStrings",          JDK_Version::jdk(7), JDK_Version::jdk(8) },
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  { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
  { "CMSTriggerPermRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
  { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
  { "AdaptivePermSizeWeight", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
  { "PermGenPadding", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
  { "PermMarkSweepDeadRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
  { "PermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
  { "MaxPermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
  { "MinPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
  { "MaxPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
  { "CMSRevisitStackSize",           JDK_Version::jdk(8), JDK_Version::jdk(9) },
  { "PrintRevisitStats",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
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  { "UseVectoredExceptions",         JDK_Version::jdk(8), JDK_Version::jdk(9) },
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  { "UseSplitVerifier",              JDK_Version::jdk(8), JDK_Version::jdk(9) },
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  { "UseISM",                        JDK_Version::jdk(8), JDK_Version::jdk(9) },
  { "UsePermISM",                    JDK_Version::jdk(8), JDK_Version::jdk(9) },
  { "UseMPSS",                       JDK_Version::jdk(8), JDK_Version::jdk(9) },
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  { "UseStringCache",                JDK_Version::jdk(8), JDK_Version::jdk(9) },
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  { "UseOldInlining",                JDK_Version::jdk(9), JDK_Version::jdk(10) },
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  { "AutoShutdownNMT",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
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#ifdef PRODUCT
  { "DesiredMethodLimit",
                           JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
#endif // PRODUCT
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  { NULL, JDK_Version(0), JDK_Version(0) }
};

// Returns true if the flag is obsolete and fits into the range specified
// for being ignored.  In the case that the flag is ignored, the 'version'
// value is filled in with the version number when the flag became
// obsolete so that that value can be displayed to the user.
bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
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  int i = 0;
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  assert(version != NULL, "Must provide a version buffer");
  while (obsolete_jvm_flags[i].name != NULL) {
    const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
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    // <flag>=xxx form
    // [-|+]<flag> form
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    if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
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        ((s[0] == '+' || s[0] == '-') &&
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        (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
      if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
          *version = flag_status.obsoleted_in;
          return true;
      }
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    }
    i++;
  }
  return false;
}

// Constructs the system class path (aka boot class path) from the following
// components, in order:
//
//     prefix           // from -Xbootclasspath/p:...
//     endorsed         // the expansion of -Djava.endorsed.dirs=...
//     base             // from os::get_system_properties() or -Xbootclasspath=
//     suffix           // from -Xbootclasspath/a:...
//
// java.endorsed.dirs is a list of directories; any jar or zip files in the
// directories are added to the sysclasspath just before the base.
//
// This could be AllStatic, but it isn't needed after argument processing is
// complete.
class SysClassPath: public StackObj {
public:
  SysClassPath(const char* base);
  ~SysClassPath();

  inline void set_base(const char* base);
  inline void add_prefix(const char* prefix);
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  inline void add_suffix_to_prefix(const char* suffix);
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  inline void add_suffix(const char* suffix);
  inline void reset_path(const char* base);

  // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
  // property.  Must be called after all command-line arguments have been
  // processed (in particular, -Djava.endorsed.dirs=...) and before calling
  // combined_path().
  void expand_endorsed();

  inline const char* get_base()     const { return _items[_scp_base]; }
  inline const char* get_prefix()   const { return _items[_scp_prefix]; }
  inline const char* get_suffix()   const { return _items[_scp_suffix]; }
  inline const char* get_endorsed() const { return _items[_scp_endorsed]; }

  // Combine all the components into a single c-heap-allocated string; caller
  // must free the string if/when no longer needed.
  char* combined_path();

private:
  // Utility routines.
  static char* add_to_path(const char* path, const char* str, bool prepend);
  static char* add_jars_to_path(char* path, const char* directory);

  inline void reset_item_at(int index);

  // Array indices for the items that make up the sysclasspath.  All except the
  // base are allocated in the C heap and freed by this class.
  enum {
    _scp_prefix,        // from -Xbootclasspath/p:...
    _scp_endorsed,      // the expansion of -Djava.endorsed.dirs=...
    _scp_base,          // the default sysclasspath
    _scp_suffix,        // from -Xbootclasspath/a:...
    _scp_nitems         // the number of items, must be last.
  };

  const char* _items[_scp_nitems];
  DEBUG_ONLY(bool _expansion_done;)
};

SysClassPath::SysClassPath(const char* base) {
  memset(_items, 0, sizeof(_items));
  _items[_scp_base] = base;
  DEBUG_ONLY(_expansion_done = false;)
}

SysClassPath::~SysClassPath() {
  // Free everything except the base.
  for (int i = 0; i < _scp_nitems; ++i) {
    if (i != _scp_base) reset_item_at(i);
  }
  DEBUG_ONLY(_expansion_done = false;)
}

inline void SysClassPath::set_base(const char* base) {
  _items[_scp_base] = base;
}

inline void SysClassPath::add_prefix(const char* prefix) {
  _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
}

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inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
  _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
}

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inline void SysClassPath::add_suffix(const char* suffix) {
  _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
}

inline void SysClassPath::reset_item_at(int index) {
  assert(index < _scp_nitems && index != _scp_base, "just checking");
  if (_items[index] != NULL) {
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    FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
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    _items[index] = NULL;
  }
}

inline void SysClassPath::reset_path(const char* base) {
  // Clear the prefix and suffix.
  reset_item_at(_scp_prefix);
  reset_item_at(_scp_suffix);
  set_base(base);
}

//------------------------------------------------------------------------------

void SysClassPath::expand_endorsed() {
  assert(_items[_scp_endorsed] == NULL, "can only be called once.");

  const char* path = Arguments::get_property("java.endorsed.dirs");
  if (path == NULL) {
    path = Arguments::get_endorsed_dir();
    assert(path != NULL, "no default for java.endorsed.dirs");
  }

  char* expanded_path = NULL;
  const char separator = *os::path_separator();
  const char* const end = path + strlen(path);
  while (path < end) {
    const char* tmp_end = strchr(path, separator);
    if (tmp_end == NULL) {
      expanded_path = add_jars_to_path(expanded_path, path);
      path = end;
    } else {
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      char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
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      memcpy(dirpath, path, tmp_end - path);
      dirpath[tmp_end - path] = '\0';
      expanded_path = add_jars_to_path(expanded_path, dirpath);
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      FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
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      path = tmp_end + 1;
    }
  }
  _items[_scp_endorsed] = expanded_path;
  DEBUG_ONLY(_expansion_done = true;)
}

// Combine the bootclasspath elements, some of which may be null, into a single
// c-heap-allocated string.
char* SysClassPath::combined_path() {
  assert(_items[_scp_base] != NULL, "empty default sysclasspath");
  assert(_expansion_done, "must call expand_endorsed() first.");

  size_t lengths[_scp_nitems];
  size_t total_len = 0;

  const char separator = *os::path_separator();

  // Get the lengths.
  int i;
  for (i = 0; i < _scp_nitems; ++i) {
    if (_items[i] != NULL) {
      lengths[i] = strlen(_items[i]);
      // Include space for the separator char (or a NULL for the last item).
      total_len += lengths[i] + 1;
    }
  }
  assert(total_len > 0, "empty sysclasspath not allowed");

  // Copy the _items to a single string.
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  char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
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  char* cp_tmp = cp;
  for (i = 0; i < _scp_nitems; ++i) {
    if (_items[i] != NULL) {
      memcpy(cp_tmp, _items[i], lengths[i]);
      cp_tmp += lengths[i];
      *cp_tmp++ = separator;
    }
  }
  *--cp_tmp = '\0';     // Replace the extra separator.
  return cp;
}

// Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
char*
SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
  char *cp;

  assert(str != NULL, "just checking");
  if (path == NULL) {
    size_t len = strlen(str) + 1;
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    cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
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    memcpy(cp, str, len);                       // copy the trailing null
  } else {
    const char separator = *os::path_separator();
    size_t old_len = strlen(path);
    size_t str_len = strlen(str);
    size_t len = old_len + str_len + 2;

    if (prepend) {
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      cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
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      char* cp_tmp = cp;
      memcpy(cp_tmp, str, str_len);
      cp_tmp += str_len;
      *cp_tmp = separator;
      memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
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      FREE_C_HEAP_ARRAY(char, path, mtInternal);
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    } else {
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      cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
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      char* cp_tmp = cp + old_len;
      *cp_tmp = separator;
      memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
    }
  }
  return cp;
}

// Scan the directory and append any jar or zip files found to path.
// Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
  DIR* dir = os::opendir(directory);
  if (dir == NULL) return path;

  char dir_sep[2] = { '\0', '\0' };
  size_t directory_len = strlen(directory);
  const char fileSep = *os::file_separator();
  if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;

  /* Scan the directory for jars/zips, appending them to path. */
  struct dirent *entry;
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  char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
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  while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
    const char* name = entry->d_name;
    const char* ext = name + strlen(name) - 4;
    bool isJarOrZip = ext > name &&
      (os::file_name_strcmp(ext, ".jar") == 0 ||
       os::file_name_strcmp(ext, ".zip") == 0);
    if (isJarOrZip) {
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      char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
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      sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
      path = add_to_path(path, jarpath, false);
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      FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
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    }
  }
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  FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
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  os::closedir(dir);
  return path;
}

// Parses a memory size specification string.
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static bool atomull(const char *s, julong* result) {
  julong n = 0;
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  int args_read = sscanf(s, JULONG_FORMAT, &n);
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  if (args_read != 1) {
    return false;
  }
  while (*s != '\0' && isdigit(*s)) {
    s++;
  }
  // 4705540: illegal if more characters are found after the first non-digit
  if (strlen(s) > 1) {
    return false;
  }
  switch (*s) {
    case 'T': case 't':
      *result = n * G * K;
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      // Check for overflow.
      if (*result/((julong)G * K) != n) return false;
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      return true;
    case 'G': case 'g':
      *result = n * G;
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      if (*result/G != n) return false;
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      return true;
    case 'M': case 'm':
      *result = n * M;
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      if (*result/M != n) return false;
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      return true;
    case 'K': case 'k':
      *result = n * K;
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      if (*result/K != n) return false;
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      return true;
    case '\0':
      *result = n;
      return true;
    default:
      return false;
  }
}

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Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
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  if (size < min_size) return arg_too_small;
  // Check that size will fit in a size_t (only relevant on 32-bit)
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  if (size > max_uintx) return arg_too_big;
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  return arg_in_range;
}

// Describe an argument out of range error
void Arguments::describe_range_error(ArgsRange errcode) {
  switch(errcode) {
  case arg_too_big:
    jio_fprintf(defaultStream::error_stream(),
                "The specified size exceeds the maximum "
                "representable size.\n");
    break;
  case arg_too_small:
  case arg_unreadable:
  case arg_in_range:
    // do nothing for now
    break;
  default:
    ShouldNotReachHere();
  }
}

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static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
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  return CommandLineFlags::boolAtPut(name, &value, origin);
}

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static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
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  double v;
  if (sscanf(value, "%lf", &v) != 1) {
    return false;
  }

  if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
    return true;
  }
  return false;
}

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static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
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  julong v;
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  intx intx_v;
  bool is_neg = false;
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  // Check the sign first since atomull() parses only unsigned values.
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  if (*value == '-') {
    if (!CommandLineFlags::intxAt(name, &intx_v)) {
      return false;
    }
    value++;
    is_neg = true;
  }
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  if (!atomull(value, &v)) {
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    return false;
  }
  intx_v = (intx) v;
  if (is_neg) {
    intx_v = -intx_v;
  }
  if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
    return true;
  }
  uintx uintx_v = (uintx) v;
  if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
    return true;
  }
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  uint64_t uint64_t_v = (uint64_t) v;
  if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
    return true;
  }
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  return false;
}

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static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
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  if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
  // Contract:  CommandLineFlags always returns a pointer that needs freeing.
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  FREE_C_HEAP_ARRAY(char, value, mtInternal);
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  return true;
}

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static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
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  const char* old_value = "";
  if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
  size_t old_len = old_value != NULL ? strlen(old_value) : 0;
  size_t new_len = strlen(new_value);
  const char* value;
  char* free_this_too = NULL;
  if (old_len == 0) {
    value = new_value;
  } else if (new_len == 0) {
    value = old_value;
  } else {
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    char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
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    // each new setting adds another LINE to the switch:
    sprintf(buf, "%s\n%s", old_value, new_value);
    value = buf;
    free_this_too = buf;
  }
  (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
  // CommandLineFlags always returns a pointer that needs freeing.
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  FREE_C_HEAP_ARRAY(char, value, mtInternal);
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  if (free_this_too != NULL) {
    // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
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    FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
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  }
  return true;
}

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bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
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  // range of acceptable characters spelled out for portability reasons
#define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
#define BUFLEN 255
  char name[BUFLEN+1];
  char dummy;

  if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
    return set_bool_flag(name, false, origin);
  }
  if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
    return set_bool_flag(name, true, origin);
  }

  char punct;
  if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
    const char* value = strchr(arg, '=') + 1;
    Flag* flag = Flag::find_flag(name, strlen(name));
    if (flag != NULL && flag->is_ccstr()) {
      if (flag->ccstr_accumulates()) {
        return append_to_string_flag(name, value, origin);
      } else {
        if (value[0] == '\0') {
          value = NULL;
        }
        return set_string_flag(name, value, origin);
      }
    }
  }

  if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
    const char* value = strchr(arg, '=') + 1;
    // -XX:Foo:=xxx will reset the string flag to the given value.
    if (value[0] == '\0') {
      value = NULL;
    }
    return set_string_flag(name, value, origin);
  }

#define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
#define SIGNED_NUMBER_RANGE    "[-0123456789]"
#define        NUMBER_RANGE    "[0123456789]"
  char value[BUFLEN + 1];
  char value2[BUFLEN + 1];
  if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
    // Looks like a floating-point number -- try again with more lenient format string
    if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
      return set_fp_numeric_flag(name, value, origin);
    }
  }

#define VALUE_RANGE "[-kmgtKMGT0123456789]"
  if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
    return set_numeric_flag(name, value, origin);
  }

  return false;
}

void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
  assert(bldarray != NULL, "illegal argument");

  if (arg == NULL) {
    return;
  }

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  int new_count = *count + 1;
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  // expand the array and add arg to the last element
  if (*bldarray == NULL) {
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    *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
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  } else {
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    *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
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  }
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  (*bldarray)[*count] = strdup(arg);
  *count = new_count;
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}

void Arguments::build_jvm_args(const char* arg) {
  add_string(&_jvm_args_array, &_num_jvm_args, arg);
}

void Arguments::build_jvm_flags(const char* arg) {
  add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
}

// utility function to return a string that concatenates all
// strings in a given char** array
const char* Arguments::build_resource_string(char** args, int count) {
  if (args == NULL || count == 0) {
    return NULL;
  }
  size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
  for (int i = 1; i < count; i++) {
    length += strlen(args[i]) + 1; // add 1 for a space
  }
  char* s = NEW_RESOURCE_ARRAY(char, length);
  strcpy(s, args[0]);
  for (int j = 1; j < count; j++) {
    strcat(s, " ");
    strcat(s, args[j]);
  }
  return (const char*) s;
}

void Arguments::print_on(outputStream* st) {
  st->print_cr("VM Arguments:");
  if (num_jvm_flags() > 0) {
    st->print("jvm_flags: "); print_jvm_flags_on(st);
  }
  if (num_jvm_args() > 0) {
    st->print("jvm_args: "); print_jvm_args_on(st);
  }
  st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
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  if (_java_class_path != NULL) {
    char* path = _java_class_path->value();
    st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
  }
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  st->print_cr("Launcher Type: %s", _sun_java_launcher);
}

void Arguments::print_jvm_flags_on(outputStream* st) {
  if (_num_jvm_flags > 0) {
    for (int i=0; i < _num_jvm_flags; i++) {
      st->print("%s ", _jvm_flags_array[i]);
    }
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    st->cr();
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  }
}

void Arguments::print_jvm_args_on(outputStream* st) {
  if (_num_jvm_args > 0) {
    for (int i=0; i < _num_jvm_args; i++) {
      st->print("%s ", _jvm_args_array[i]);
    }
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    st->cr();
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  }
}

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bool Arguments::process_argument(const char* arg,
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    jboolean ignore_unrecognized, Flag::Flags origin) {
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  JDK_Version since = JDK_Version();
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  if (parse_argument(arg, origin) || ignore_unrecognized) {
    return true;
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  }
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  bool has_plus_minus = (*arg == '+' || *arg == '-');
  const char* const argname = has_plus_minus ? arg + 1 : arg;
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  if (is_newly_obsolete(arg, &since)) {
    char version[256];
    since.to_string(version, sizeof(version));
    warning("ignoring option %s; support was removed in %s", argname, version);
    return true;
  }

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  // For locked flags, report a custom error message if available.
  // Otherwise, report the standard unrecognized VM option.

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  size_t arg_len;
  const char* equal_sign = strchr(argname, '=');
  if (equal_sign == NULL) {
    arg_len = strlen(argname);
  } else {
    arg_len = equal_sign - argname;
  }

888
  Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
889
  if (found_flag != NULL) {
890
    char locked_message_buf[BUFLEN];
891
    found_flag->get_locked_message(locked_message_buf, BUFLEN);
892
    if (strlen(locked_message_buf) == 0) {
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      if (found_flag->is_bool() && !has_plus_minus) {
        jio_fprintf(defaultStream::error_stream(),
          "Missing +/- setting for VM option '%s'\n", argname);
      } else if (!found_flag->is_bool() && has_plus_minus) {
        jio_fprintf(defaultStream::error_stream(),
          "Unexpected +/- setting in VM option '%s'\n", argname);
      } else {
        jio_fprintf(defaultStream::error_stream(),
          "Improperly specified VM option '%s'\n", argname);
      }
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    } else {
      jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
    }
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  } else {
    jio_fprintf(defaultStream::error_stream(),
                "Unrecognized VM option '%s'\n", argname);
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    Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
    if (fuzzy_matched != NULL) {
      jio_fprintf(defaultStream::error_stream(),
                  "Did you mean '%s%s%s'?\n",
                  (fuzzy_matched->is_bool()) ? "(+/-)" : "",
914
                  fuzzy_matched->_name,
915 916
                  (fuzzy_matched->is_bool()) ? "" : "=<value>");
    }
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  }

919 920
  // allow for commandline "commenting out" options like -XX:#+Verbose
  return arg[0] == '#';
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}

bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
  FILE* stream = fopen(file_name, "rb");
  if (stream == NULL) {
    if (should_exist) {
      jio_fprintf(defaultStream::error_stream(),
                  "Could not open settings file %s\n", file_name);
      return false;
    } else {
      return true;
    }
  }

  char token[1024];
  int  pos = 0;

  bool in_white_space = true;
  bool in_comment     = false;
  bool in_quote       = false;
  char quote_c        = 0;
  bool result         = true;

  int c = getc(stream);
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  while(c != EOF && pos < (int)(sizeof(token)-1)) {
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    if (in_white_space) {
      if (in_comment) {
        if (c == '\n') in_comment = false;
      } else {
        if (c == '#') in_comment = true;
        else if (!isspace(c)) {
          in_white_space = false;
          token[pos++] = c;
        }
      }
    } else {
      if (c == '\n' || (!in_quote && isspace(c))) {
        // token ends at newline, or at unquoted whitespace
        // this allows a way to include spaces in string-valued options
        token[pos] = '\0';
        logOption(token);
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        result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
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        build_jvm_flags(token);
        pos = 0;
        in_white_space = true;
        in_quote = false;
      } else if (!in_quote && (c == '\'' || c == '"')) {
        in_quote = true;
        quote_c = c;
      } else if (in_quote && (c == quote_c)) {
        in_quote = false;
      } else {
        token[pos++] = c;
      }
    }
    c = getc(stream);
  }
  if (pos > 0) {
    token[pos] = '\0';
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    result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
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    build_jvm_flags(token);
  }
  fclose(stream);
  return result;
}

//=============================================================================================================
// Parsing of properties (-D)

const char* Arguments::get_property(const char* key) {
  return PropertyList_get_value(system_properties(), key);
}

bool Arguments::add_property(const char* prop) {
  const char* eq = strchr(prop, '=');
  char* key;
  // ns must be static--its address may be stored in a SystemProperty object.
  const static char ns[1] = {0};
  char* value = (char *)ns;

  size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
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  key = AllocateHeap(key_len + 1, mtInternal);
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  strncpy(key, prop, key_len);
  key[key_len] = '\0';

  if (eq != NULL) {
    size_t value_len = strlen(prop) - key_len - 1;
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    value = AllocateHeap(value_len + 1, mtInternal);
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    strncpy(value, &prop[key_len + 1], value_len + 1);
  }

  if (strcmp(key, "java.compiler") == 0) {
    process_java_compiler_argument(value);
    FreeHeap(key);
    if (eq != NULL) {
      FreeHeap(value);
    }
    return true;
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  } else if (strcmp(key, "sun.java.command") == 0) {
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    _java_command = value;

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    // Record value in Arguments, but let it get passed to Java.
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  } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
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    // launcher.pid property is private and is processed
    // in process_sun_java_launcher_properties();
    // the sun.java.launcher property is passed on to the java application
    FreeHeap(key);
    if (eq != NULL) {
      FreeHeap(value);
    }
    return true;
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  } else if (strcmp(key, "java.vendor.url.bug") == 0) {
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    // save it in _java_vendor_url_bug, so JVM fatal error handler can access
    // its value without going through the property list or making a Java call.
    _java_vendor_url_bug = value;
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  } else if (strcmp(key, "sun.boot.library.path") == 0) {
    PropertyList_unique_add(&_system_properties, key, value, true);
    return true;
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  }
  // Create new property and add at the end of the list
  PropertyList_unique_add(&_system_properties, key, value);
  return true;
}

//===========================================================================================================
// Setting int/mixed/comp mode flags

void Arguments::set_mode_flags(Mode mode) {
  // Set up default values for all flags.
  // If you add a flag to any of the branches below,
  // add a default value for it here.
  set_java_compiler(false);
  _mode                      = mode;

  // Ensure Agent_OnLoad has the correct initial values.
  // This may not be the final mode; mode may change later in onload phase.
  PropertyList_unique_add(&_system_properties, "java.vm.info",
1058
                          (char*)VM_Version::vm_info_string(), false);
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  UseInterpreter             = true;
  UseCompiler                = true;
  UseLoopCounter             = true;

1064 1065 1066
#ifndef ZERO
  // Turn these off for mixed and comp.  Leave them on for Zero.
  if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1067
    UseFastAccessorMethods = (mode == _int);
1068 1069
  }
  if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1070
    UseFastEmptyMethods = (mode == _int);
1071 1072 1073
  }
#endif

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  // Default values may be platform/compiler dependent -
  // use the saved values
  ClipInlining               = Arguments::_ClipInlining;
  AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
  UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
  BackgroundCompilation      = Arguments::_BackgroundCompilation;

  // Change from defaults based on mode
  switch (mode) {
  default:
    ShouldNotReachHere();
    break;
  case _int:
    UseCompiler              = false;
    UseLoopCounter           = false;
    AlwaysCompileLoopMethods = false;
    UseOnStackReplacement    = false;
    break;
  case _mixed:
    // same as default
    break;
  case _comp:
    UseInterpreter           = false;
    BackgroundCompilation    = false;
    ClipInlining             = false;
1099 1100 1101 1102 1103 1104 1105
    // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
    // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
    // compile a level 4 (C2) and then continue executing it.
    if (TieredCompilation) {
      Tier3InvokeNotifyFreqLog = 0;
      Tier4InvocationThreshold = 0;
    }
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    break;
  }
}

1110
#if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
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// Conflict: required to use shared spaces (-Xshare:on), but
// incompatible command line options were chosen.

static void no_shared_spaces() {
  if (RequireSharedSpaces) {
    jio_fprintf(defaultStream::error_stream(),
      "Class data sharing is inconsistent with other specified options.\n");
    vm_exit_during_initialization("Unable to use shared archive.", NULL);
  } else {
    FLAG_SET_DEFAULT(UseSharedSpaces, false);
  }
}
1123
#endif
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void Arguments::set_tiered_flags() {
1126
  // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
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  if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1128
    FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
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1129 1130 1131 1132 1133
  }
  if (CompilationPolicyChoice < 2) {
    vm_exit_during_initialization(
      "Incompatible compilation policy selected", NULL);
  }
1134
  // Increase the code cache size - tiered compiles a lot more.
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  if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1136
    FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
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1137
  }
1138 1139 1140 1141
  if (!UseInterpreter) { // -Xcomp
    Tier3InvokeNotifyFreqLog = 0;
    Tier4InvocationThreshold = 0;
  }
I
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1142 1143
}

1144
#if INCLUDE_ALL_GCS
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
static void disable_adaptive_size_policy(const char* collector_name) {
  if (UseAdaptiveSizePolicy) {
    if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
      warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
              collector_name);
    }
    FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
  }
}

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void Arguments::set_parnew_gc_flags() {
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  assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1157 1158
         "control point invariant");
  assert(UseParNewGC, "Error");
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1160 1161
  // Turn off AdaptiveSizePolicy for parnew until it is complete.
  disable_adaptive_size_policy("UseParNewGC");
1162

1163 1164 1165 1166 1167 1168 1169
  if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
    FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
    assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
  } else if (ParallelGCThreads == 0) {
    jio_fprintf(defaultStream::error_stream(),
        "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
    vm_exit(1);
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  }

1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
  // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
  // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
  // we set them to 1024 and 1024.
  // See CR 6362902.
  if (FLAG_IS_DEFAULT(YoungPLABSize)) {
    FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
  }
  if (FLAG_IS_DEFAULT(OldPLABSize)) {
    FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
  }

  // AlwaysTenure flag should make ParNew promote all at first collection.
  // See CR 6362902.
  if (AlwaysTenure) {
    FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
  }
  // When using compressed oops, we use local overflow stacks,
  // rather than using a global overflow list chained through
  // the klass word of the object's pre-image.
  if (UseCompressedOops && !ParGCUseLocalOverflow) {
    if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
      warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1194
    }
1195
    FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
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  }
1197
  assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
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}

// Adjust some sizes to suit CMS and/or ParNew needs; these work well on
// sparc/solaris for certain applications, but would gain from
// further optimization and tuning efforts, and would almost
// certainly gain from analysis of platform and environment.
void Arguments::set_cms_and_parnew_gc_flags() {
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  assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1206 1207
  assert(UseConcMarkSweepGC, "CMS is expected to be on here");

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  // If we are using CMS, we prefer to UseParNewGC,
  // unless explicitly forbidden.
1210
  if (FLAG_IS_DEFAULT(UseParNewGC)) {
1211
    FLAG_SET_ERGO(bool, UseParNewGC, true);
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1212 1213
  }

1214
  // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1215
  disable_adaptive_size_policy("UseConcMarkSweepGC");
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1216 1217 1218

  // In either case, adjust ParallelGCThreads and/or UseParNewGC
  // as needed.
1219 1220
  if (UseParNewGC) {
    set_parnew_gc_flags();
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  }

1223 1224 1225
  size_t max_heap = align_size_down(MaxHeapSize,
                                    CardTableRS::ct_max_alignment_constraint());

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1226
  // Now make adjustments for CMS
1227 1228 1229 1230 1231
  intx   tenuring_default = (intx)6;
  size_t young_gen_per_worker = CMSYoungGenPerWorker;

  // Preferred young gen size for "short" pauses:
  // upper bound depends on # of threads and NewRatio.
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  const uintx parallel_gc_threads =
    (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
  const size_t preferred_max_new_size_unaligned =
1235 1236
    MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
  size_t preferred_max_new_size =
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1237 1238 1239
    align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());

  // Unless explicitly requested otherwise, size young gen
1240
  // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1241 1242 1243 1244 1245 1246 1247 1248

  // If either MaxNewSize or NewRatio is set on the command line,
  // assume the user is trying to set the size of the young gen.
  if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {

    // Set MaxNewSize to our calculated preferred_max_new_size unless
    // NewSize was set on the command line and it is larger than
    // preferred_max_new_size.
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    if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1250
      FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
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    } else {
1252
      FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
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1253
    }
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    if (PrintGCDetails && Verbose) {
1255
      // Too early to use gclog_or_tty
1256
      tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1257 1258 1259
    }

    // Code along this path potentially sets NewSize and OldSize
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    if (PrintGCDetails && Verbose) {
1261 1262 1263 1264
      // Too early to use gclog_or_tty
      tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
           " initial_heap_size:  " SIZE_FORMAT
           " max_heap: " SIZE_FORMAT,
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           min_heap_size(), InitialHeapSize, max_heap);
1266
    }
1267 1268 1269 1270 1271
    size_t min_new = preferred_max_new_size;
    if (FLAG_IS_CMDLINE(NewSize)) {
      min_new = NewSize;
    }
    if (max_heap > min_new && min_heap_size() > min_new) {
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      // Unless explicitly requested otherwise, make young gen
      // at least min_new, and at most preferred_max_new_size.
      if (FLAG_IS_DEFAULT(NewSize)) {
1275 1276
        FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
        FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
P
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        if (PrintGCDetails && Verbose) {
1278
          // Too early to use gclog_or_tty
1279
          tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1280
        }
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1281 1282
      }
      // Unless explicitly requested otherwise, size old gen
1283
      // so it's NewRatio x of NewSize.
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1284 1285
      if (FLAG_IS_DEFAULT(OldSize)) {
        if (max_heap > NewSize) {
1286
          FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
P
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1287
          if (PrintGCDetails && Verbose) {
1288
            // Too early to use gclog_or_tty
1289
            tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1290
          }
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1291 1292 1293 1294 1295 1296 1297 1298
        }
      }
    }
  }
  // Unless explicitly requested otherwise, definitely
  // promote all objects surviving "tenuring_default" scavenges.
  if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
      FLAG_IS_DEFAULT(SurvivorRatio)) {
1299
    FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
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  }
  // If we decided above (or user explicitly requested)
  // `promote all' (via MaxTenuringThreshold := 0),
  // prefer minuscule survivor spaces so as not to waste
  // space for (non-existent) survivors
  if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1306
    FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
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  }
  // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
  // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
  // This is done in order to make ParNew+CMS configuration to work
  // with YoungPLABSize and OldPLABSize options.
  // See CR 6362902.
  if (!FLAG_IS_DEFAULT(OldPLABSize)) {
    if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1315 1316 1317 1318 1319
      // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
      // is.  In this situtation let CMSParPromoteBlocksToClaim follow
      // the value (either from the command line or ergonomics) of
      // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
      FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1320
    } else {
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1321 1322 1323 1324
      // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
      // CMSParPromoteBlocksToClaim is a collector-specific flag, so
      // we'll let it to take precedence.
      jio_fprintf(defaultStream::error_stream(),
1325 1326 1327
                  "Both OldPLABSize and CMSParPromoteBlocksToClaim"
                  " options are specified for the CMS collector."
                  " CMSParPromoteBlocksToClaim will take precedence.\n");
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1328 1329
    }
  }
1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344
  if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
    // OldPLAB sizing manually turned off: Use a larger default setting,
    // unless it was manually specified. This is because a too-low value
    // will slow down scavenges.
    if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
      FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
    }
  }
  // Overwrite OldPLABSize which is the variable we will internally use everywhere.
  FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
  // If either of the static initialization defaults have changed, note this
  // modification.
  if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
    CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
  }
1345 1346
  if (PrintGCDetails && Verbose) {
    tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1347 1348
      (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
    tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1349
  }
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1350
}
1351
#endif // INCLUDE_ALL_GCS
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1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367
void set_object_alignment() {
  // Object alignment.
  assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
  MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
  assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
  MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
  assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
  MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;

  LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
  LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;

  // Oop encoding heap max
  OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;

1368
#if INCLUDE_ALL_GCS
1369 1370
  // Set CMS global values
  CompactibleFreeListSpace::set_cms_values();
1371
#endif // INCLUDE_ALL_GCS
1372 1373 1374 1375 1376 1377
}

bool verify_object_alignment() {
  // Object alignment.
  if (!is_power_of_2(ObjectAlignmentInBytes)) {
    jio_fprintf(defaultStream::error_stream(),
1378 1379
                "error: ObjectAlignmentInBytes=%d must be power of 2\n",
                (int)ObjectAlignmentInBytes);
1380 1381 1382 1383
    return false;
  }
  if ((int)ObjectAlignmentInBytes < BytesPerLong) {
    jio_fprintf(defaultStream::error_stream(),
1384 1385 1386 1387 1388 1389 1390 1391 1392
                "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
                (int)ObjectAlignmentInBytes, BytesPerLong);
    return false;
  }
  // It does not make sense to have big object alignment
  // since a space lost due to alignment will be greater
  // then a saved space from compressed oops.
  if ((int)ObjectAlignmentInBytes > 256) {
    jio_fprintf(defaultStream::error_stream(),
1393
                "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1394 1395 1396 1397 1398 1399
                (int)ObjectAlignmentInBytes);
    return false;
  }
  // In case page size is very small.
  if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
    jio_fprintf(defaultStream::error_stream(),
1400
                "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1401
                (int)ObjectAlignmentInBytes, os::vm_page_size());
1402 1403
    return false;
  }
1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419
  if(SurvivorAlignmentInBytes == 0) {
    SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
  } else {
    if (!is_power_of_2(SurvivorAlignmentInBytes)) {
      jio_fprintf(defaultStream::error_stream(),
            "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
            (int)SurvivorAlignmentInBytes);
      return false;
    }
    if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
      jio_fprintf(defaultStream::error_stream(),
          "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
          (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
      return false;
    }
  }
1420 1421 1422
  return true;
}

1423
size_t Arguments::max_heap_for_compressed_oops() {
1424
  // Avoid sign flip.
1425
  assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1426 1427 1428 1429 1430
  // We need to fit both the NULL page and the heap into the memory budget, while
  // keeping alignment constraints of the heap. To guarantee the latter, as the
  // NULL page is located before the heap, we pad the NULL page to the conservative
  // maximum alignment that the GC may ever impose upon the heap.
  size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1431
                                                        _conservative_max_heap_alignment);
1432 1433

  LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
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  NOT_LP64(ShouldNotReachHere(); return 0);
1435 1436
}

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1437 1438 1439 1440 1441 1442 1443
bool Arguments::should_auto_select_low_pause_collector() {
  if (UseAutoGCSelectPolicy &&
      !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
      (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
    if (PrintGCDetails) {
      // Cannot use gclog_or_tty yet.
      tty->print_cr("Automatic selection of the low pause collector"
1444
       " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
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1445 1446 1447 1448 1449 1450
    }
    return true;
  }
  return false;
}

1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477
void Arguments::set_use_compressed_oops() {
#ifndef ZERO
#ifdef _LP64
  // MaxHeapSize is not set up properly at this point, but
  // the only value that can override MaxHeapSize if we are
  // to use UseCompressedOops is InitialHeapSize.
  size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);

  if (max_heap_size <= max_heap_for_compressed_oops()) {
#if !defined(COMPILER1) || defined(TIERED)
    if (FLAG_IS_DEFAULT(UseCompressedOops)) {
      FLAG_SET_ERGO(bool, UseCompressedOops, true);
    }
#endif
#ifdef _WIN64
    if (UseLargePages && UseCompressedOops) {
      // Cannot allocate guard pages for implicit checks in indexed addressing
      // mode, when large pages are specified on windows.
      // This flag could be switched ON if narrow oop base address is set to 0,
      // see code in Universe::initialize_heap().
      Universe::set_narrow_oop_use_implicit_null_checks(false);
    }
#endif //  _WIN64
  } else {
    if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
      warning("Max heap size too large for Compressed Oops");
      FLAG_SET_DEFAULT(UseCompressedOops, false);
1478
      FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1479 1480 1481 1482 1483 1484
    }
  }
#endif // _LP64
#endif // ZERO
}

1485 1486 1487 1488 1489 1490

// NOTE: set_use_compressed_klass_ptrs() must be called after calling
// set_use_compressed_oops().
void Arguments::set_use_compressed_klass_ptrs() {
#ifndef ZERO
#ifdef _LP64
1491
  // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1492
  if (!UseCompressedOops) {
1493 1494
    if (UseCompressedClassPointers) {
      warning("UseCompressedClassPointers requires UseCompressedOops");
1495
    }
1496
    FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1497
  } else {
1498 1499 1500 1501 1502 1503 1504 1505 1506
    // Turn on UseCompressedClassPointers too
    if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
      FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
    }
    // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
    if (UseCompressedClassPointers) {
      if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
        warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
        FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1507 1508 1509 1510 1511 1512 1513
      }
    }
  }
#endif // _LP64
#endif // !ZERO
}

1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526
void Arguments::set_conservative_max_heap_alignment() {
  // The conservative maximum required alignment for the heap is the maximum of
  // the alignments imposed by several sources: any requirements from the heap
  // itself, the collector policy and the maximum page size we may run the VM
  // with.
  size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
#if INCLUDE_ALL_GCS
  if (UseParallelGC) {
    heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
  } else if (UseG1GC) {
    heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
  }
#endif // INCLUDE_ALL_GCS
1527 1528 1529 1530
  _conservative_max_heap_alignment = MAX4(heap_alignment,
                                          (size_t)os::vm_allocation_granularity(),
                                          os::max_page_size(),
                                          CollectorPolicy::compute_heap_alignment());
1531 1532
}

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void Arguments::set_ergonomics_flags() {

1535
  if (os::is_server_class_machine()) {
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    // If no other collector is requested explicitly,
    // let the VM select the collector based on
    // machine class and automatic selection policy.
    if (!UseSerialGC &&
        !UseConcMarkSweepGC &&
1541
        !UseG1GC &&
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        !UseParNewGC &&
        FLAG_IS_DEFAULT(UseParallelGC)) {
      if (should_auto_select_low_pause_collector()) {
        FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
      } else {
        FLAG_SET_ERGO(bool, UseParallelGC, true);
      }
1549
    }
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  }
1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561
#ifdef COMPILER2
  // Shared spaces work fine with other GCs but causes bytecode rewriting
  // to be disabled, which hurts interpreter performance and decreases
  // server performance.  When -server is specified, keep the default off
  // unless it is asked for.  Future work: either add bytecode rewriting
  // at link time, or rewrite bytecodes in non-shared methods.
  if (!DumpSharedSpaces && !RequireSharedSpaces &&
      (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
    no_shared_spaces();
  }
#endif
1562

1563
  set_conservative_max_heap_alignment();
1564

1565
#ifndef ZERO
1566
#ifdef _LP64
1567
  set_use_compressed_oops();
1568 1569 1570 1571 1572

  // set_use_compressed_klass_ptrs() must be called after calling
  // set_use_compressed_oops().
  set_use_compressed_klass_ptrs();

1573 1574 1575
  // Also checks that certain machines are slower with compressed oops
  // in vm_version initialization code.
#endif // _LP64
1576
#endif // !ZERO
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}

void Arguments::set_parallel_gc_flags() {
1580
  assert(UseParallelGC || UseParallelOldGC, "Error");
1581 1582 1583
  // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
  if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
    FLAG_SET_DEFAULT(UseParallelOldGC, true);
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  }
1585
  FLAG_SET_DEFAULT(UseParallelGC, true);
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  // If no heap maximum was requested explicitly, use some reasonable fraction
  // of the physical memory, up to a maximum of 1GB.
1589 1590 1591 1592 1593 1594 1595
  FLAG_SET_DEFAULT(ParallelGCThreads,
                   Abstract_VM_Version::parallel_worker_threads());
  if (ParallelGCThreads == 0) {
    jio_fprintf(defaultStream::error_stream(),
        "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
    vm_exit(1);
  }
1596

1597 1598 1599 1600 1601
  if (UseAdaptiveSizePolicy) {
    // We don't want to limit adaptive heap sizing's freedom to adjust the heap
    // unless the user actually sets these flags.
    if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
      FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1602
      _min_heap_free_ratio = MinHeapFreeRatio;
1603 1604 1605
    }
    if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
      FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1606
      _max_heap_free_ratio = MaxHeapFreeRatio;
1607 1608
    }
  }
1609 1610 1611 1612 1613 1614 1615 1616

  // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
  // SurvivorRatio has been set, reset their default values to SurvivorRatio +
  // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
  // See CR 6362902 for details.
  if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
    if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
       FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
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    }
1618 1619 1620 1621
    if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
      FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
    }
  }
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1623 1624 1625 1626 1627 1628
  if (UseParallelOldGC) {
    // Par compact uses lower default values since they are treated as
    // minimums.  These are different defaults because of the different
    // interpretation and are not ergonomically set.
    if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
      FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
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    }
  }
}

1633 1634 1635 1636 1637 1638 1639 1640 1641
void Arguments::set_g1_gc_flags() {
  assert(UseG1GC, "Error");
#ifdef COMPILER1
  FastTLABRefill = false;
#endif
  FLAG_SET_DEFAULT(ParallelGCThreads,
                     Abstract_VM_Version::parallel_worker_threads());
  if (ParallelGCThreads == 0) {
    FLAG_SET_DEFAULT(ParallelGCThreads,
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                     Abstract_VM_Version::parallel_worker_threads());
1643
  }
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1645 1646 1647 1648 1649 1650
  // MarkStackSize will be set (if it hasn't been set by the user)
  // when concurrent marking is initialized.
  // Its value will be based upon the number of parallel marking threads.
  // But we do set the maximum mark stack size here.
  if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
    FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1651
  }
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  if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
    // In G1, we want the default GC overhead goal to be higher than
    // say in PS. So we set it here to 10%. Otherwise the heap might
    // be expanded more aggressively than we would like it to. In
    // fact, even 10% seems to not be high enough in some cases
    // (especially small GC stress tests that the main thing they do
    // is allocation). We might consider increase it further.
    FLAG_SET_DEFAULT(GCTimeRatio, 9);
  }
1662 1663 1664

  if (PrintGCDetails && Verbose) {
    tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1665 1666
      (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
    tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1667
  }
1668 1669
}

1670 1671 1672 1673 1674 1675 1676 1677 1678
julong Arguments::limit_by_allocatable_memory(julong limit) {
  julong max_allocatable;
  julong result = limit;
  if (os::has_allocatable_memory_limit(&max_allocatable)) {
    result = MIN2(result, max_allocatable / MaxVirtMemFraction);
  }
  return result;
}

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void Arguments::set_heap_size() {
  if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
    // Deprecated flag
    FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
  }

  const julong phys_mem =
    FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
                            : (julong)MaxRAM;

  // If the maximum heap size has not been set with -Xmx,
  // then set it as fraction of the size of physical memory,
  // respecting the maximum and minimum sizes of the heap.
1692
  if (FLAG_IS_DEFAULT(MaxHeapSize)) {
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    julong reasonable_max = phys_mem / MaxRAMFraction;

    if (phys_mem <= MaxHeapSize * MinRAMFraction) {
      // Small physical memory, so use a minimum fraction of it for the heap
      reasonable_max = phys_mem / MinRAMFraction;
    } else {
      // Not-small physical memory, so require a heap at least
      // as large as MaxHeapSize
      reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
    }
    if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
      // Limit the heap size to ErgoHeapSizeLimit
      reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
    }
    if (UseCompressedOops) {
      // Limit the heap size to the maximum possible when using compressed oops
1709 1710 1711 1712 1713 1714 1715
      julong max_coop_heap = (julong)max_heap_for_compressed_oops();
      if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
        // Heap should be above HeapBaseMinAddress to get zero based compressed oops
        // but it should be not less than default MaxHeapSize.
        max_coop_heap -= HeapBaseMinAddress;
      }
      reasonable_max = MIN2(reasonable_max, max_coop_heap);
1716
    }
1717
    reasonable_max = limit_by_allocatable_memory(reasonable_max);
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    if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
      // An initial heap size was specified on the command line,
      // so be sure that the maximum size is consistent.  Done
1722
      // after call to limit_by_allocatable_memory because that
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      // method might reduce the allocation size.
      reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
    }

1727 1728
    if (PrintGCDetails && Verbose) {
      // Cannot use gclog_or_tty yet.
1729
      tty->print_cr("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1730
    }
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    FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
  }

1734 1735 1736
  // If the minimum or initial heap_size have not been set or requested to be set
  // ergonomically, set them accordingly.
  if (InitialHeapSize == 0 || min_heap_size() == 0) {
1737 1738 1739 1740
    julong reasonable_minimum = (julong)(OldSize + NewSize);

    reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);

1741
    reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1742

1743 1744
    if (InitialHeapSize == 0) {
      julong reasonable_initial = phys_mem / InitialRAMFraction;
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1746 1747
      reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
      reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
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1749
      reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
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1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764
      if (PrintGCDetails && Verbose) {
        // Cannot use gclog_or_tty yet.
        tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
      }
      FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
    }
    // If the minimum heap size has not been set (via -Xms),
    // synchronize with InitialHeapSize to avoid errors with the default value.
    if (min_heap_size() == 0) {
      set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
      if (PrintGCDetails && Verbose) {
        // Cannot use gclog_or_tty yet.
        tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
      }
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    }
1766 1767 1768
  }
}

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// This must be called after ergonomics because we want bytecode rewriting
// if the server compiler is used, or if UseSharedSpaces is disabled.
void Arguments::set_bytecode_flags() {
  // Better not attempt to store into a read-only space.
  if (UseSharedSpaces) {
    FLAG_SET_DEFAULT(RewriteBytecodes, false);
    FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
  }

  if (!RewriteBytecodes) {
    FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
  }
}

// Aggressive optimization flags  -XX:+AggressiveOpts
void Arguments::set_aggressive_opts_flags() {
1785
#ifdef COMPILER2
1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799
  if (AggressiveUnboxing) {
    if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
      FLAG_SET_DEFAULT(EliminateAutoBox, true);
    } else if (!EliminateAutoBox) {
      // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
      AggressiveUnboxing = false;
    }
    if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
      FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
    } else if (!DoEscapeAnalysis) {
      // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
      AggressiveUnboxing = false;
    }
  }
1800 1801 1802 1803 1804 1805 1806 1807 1808 1809
  if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
    if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
      FLAG_SET_DEFAULT(EliminateAutoBox, true);
    }
    if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
      FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
    }

    // Feed the cache size setting into the JDK
    char buffer[1024];
1810
    sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1811 1812
    add_property(buffer);
  }
1813 1814 1815
  if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
    FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
  }
1816 1817
#endif

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  if (AggressiveOpts) {
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// Sample flag setting code
//    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
//      FLAG_SET_DEFAULT(EliminateZeroing, true);
//    }
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1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839
  }
}

//===========================================================================================================
// Parsing of java.compiler property

void Arguments::process_java_compiler_argument(char* arg) {
  // For backwards compatibility, Djava.compiler=NONE or ""
  // causes us to switch to -Xint mode UNLESS -Xdebug
  // is also specified.
  if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
    set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
  }
}

void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
  _sun_java_launcher = strdup(launcher);
1840 1841 1842
  if (strcmp("gamma", _sun_java_launcher) == 0) {
    _created_by_gamma_launcher = true;
  }
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}

bool Arguments::created_by_java_launcher() {
  assert(_sun_java_launcher != NULL, "property must have value");
  return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
}

1850 1851 1852 1853
bool Arguments::created_by_gamma_launcher() {
  return _created_by_gamma_launcher;
}

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//===========================================================================================================
// Parsing of main arguments

1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870
bool Arguments::verify_interval(uintx val, uintx min,
                                uintx max, const char* name) {
  // Returns true iff value is in the inclusive interval [min..max]
  // false, otherwise.
  if (val >= min && val <= max) {
    return true;
  }
  jio_fprintf(defaultStream::error_stream(),
              "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
              " and " UINTX_FORMAT "\n",
              name, val, min, max);
  return false;
}

1871
bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1872
  // Returns true if given value is at least specified min threshold
1873 1874 1875 1876 1877
  // false, otherwise.
  if (val >= min ) {
      return true;
  }
  jio_fprintf(defaultStream::error_stream(),
1878
              "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1879 1880 1881 1882
              name, val, min);
  return false;
}

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bool Arguments::verify_percentage(uintx value, const char* name) {
1884
  if (is_percentage(value)) {
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    return true;
  }
  jio_fprintf(defaultStream::error_stream(),
              "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
              name, value);
  return false;
}

1893 1894
#if !INCLUDE_ALL_GCS
#ifdef ASSERT
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static bool verify_serial_gc_flags() {
  return (UseSerialGC &&
1897
        !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1898
          UseParallelGC || UseParallelOldGC));
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}
1900 1901
#endif // ASSERT
#endif // INCLUDE_ALL_GCS
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1903 1904 1905
// check if do gclog rotation
// +UseGCLogFileRotation is a must,
// no gc log rotation when log file not supplied or
1906
// NumberOfGCLogFiles is 0
1907 1908
void check_gclog_consistency() {
  if (UseGCLogFileRotation) {
1909
    if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1910
      jio_fprintf(defaultStream::output_stream(),
1911 1912
                  "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
                  "where num_of_file > 0\n"
1913 1914 1915 1916 1917
                  "GC log rotation is turned off\n");
      UseGCLogFileRotation = false;
    }
  }

1918 1919 1920 1921
  if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
    FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
    jio_fprintf(defaultStream::output_stream(),
                "GCLogFileSize changed to minimum 8K\n");
1922 1923 1924
  }
}

1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969
// This function is called for -Xloggc:<filename>, it can be used
// to check if a given file name(or string) conforms to the following
// specification:
// A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
// %p and %t only allowed once. We only limit usage of filename not path
bool is_filename_valid(const char *file_name) {
  const char* p = file_name;
  char file_sep = os::file_separator()[0];
  const char* cp;
  // skip prefix path
  for (cp = file_name; *cp != '\0'; cp++) {
    if (*cp == '/' || *cp == file_sep) {
      p = cp + 1;
    }
  }

  int count_p = 0;
  int count_t = 0;
  while (*p != '\0') {
    if ((*p >= '0' && *p <= '9') ||
        (*p >= 'A' && *p <= 'Z') ||
        (*p >= 'a' && *p <= 'z') ||
         *p == '-'               ||
         *p == '_'               ||
         *p == '.') {
       p++;
       continue;
    }
    if (*p == '%') {
      if(*(p + 1) == 'p') {
        p += 2;
        count_p ++;
        continue;
      }
      if (*(p + 1) == 't') {
        p += 2;
        count_t ++;
        continue;
      }
    }
    return false;
  }
  return count_p < 2 && count_t < 2;
}

1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980
bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
  if (!is_percentage(min_heap_free_ratio)) {
    err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
    return false;
  }
  if (min_heap_free_ratio > MaxHeapFreeRatio) {
    err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
                  "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
                  MaxHeapFreeRatio);
    return false;
  }
1981 1982
  // This does not set the flag itself, but stores the value in a safe place for later usage.
  _min_heap_free_ratio = min_heap_free_ratio;
1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996
  return true;
}

bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
  if (!is_percentage(max_heap_free_ratio)) {
    err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
    return false;
  }
  if (max_heap_free_ratio < MinHeapFreeRatio) {
    err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
                  "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
                  MinHeapFreeRatio);
    return false;
  }
1997 1998
  // This does not set the flag itself, but stores the value in a safe place for later usage.
  _max_heap_free_ratio = max_heap_free_ratio;
1999 2000 2001
  return true;
}

2002 2003
// Check consistency of GC selection
bool Arguments::check_gc_consistency() {
2004
  check_gclog_consistency();
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
  bool status = true;
  // Ensure that the user has not selected conflicting sets
  // of collectors. [Note: this check is merely a user convenience;
  // collectors over-ride each other so that only a non-conflicting
  // set is selected; however what the user gets is not what they
  // may have expected from the combination they asked for. It's
  // better to reduce user confusion by not allowing them to
  // select conflicting combinations.
  uint i = 0;
  if (UseSerialGC)                       i++;
  if (UseConcMarkSweepGC || UseParNewGC) i++;
  if (UseParallelGC || UseParallelOldGC) i++;
2017
  if (UseG1GC)                           i++;
2018 2019 2020 2021 2022 2023 2024 2025 2026 2027
  if (i > 1) {
    jio_fprintf(defaultStream::error_stream(),
                "Conflicting collector combinations in option list; "
                "please refer to the release notes for the combinations "
                "allowed\n");
    status = false;
  }
  return status;
}

2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039
void Arguments::check_deprecated_gcs() {
  if (UseConcMarkSweepGC && !UseParNewGC) {
    warning("Using the DefNew young collector with the CMS collector is deprecated "
        "and will likely be removed in a future release");
  }

  if (UseParNewGC && !UseConcMarkSweepGC) {
    // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
    // set up UseSerialGC properly, so that can't be used in the check here.
    warning("Using the ParNew young collector with the Serial old collector is deprecated "
        "and will likely be removed in a future release");
  }
2040 2041 2042 2043

  if (CMSIncrementalMode) {
    warning("Using incremental CMS is deprecated and will likely be removed in a future release");
  }
2044 2045
}

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void Arguments::check_deprecated_gc_flags() {
  if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
    warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
            "and will likely be removed in future release");
  }
2051 2052 2053 2054
  if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
    warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
        "Use MaxRAMFraction instead.");
  }
2055 2056 2057 2058 2059 2060 2061 2062 2063
  if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
    warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
  }
  if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
    warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
  }
  if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
    warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
  }
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}

2066 2067 2068 2069 2070 2071
// Check stack pages settings
bool Arguments::check_stack_pages()
{
  bool status = true;
  status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
  status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2072 2073
  // greater stack shadow pages can't generate instruction to bang stack
  status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2074 2075 2076
  return status;
}

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// Check the consistency of vm_init_args
bool Arguments::check_vm_args_consistency() {
  // Method for adding checks for flag consistency.
  // The intent is to warn the user of all possible conflicts,
  // before returning an error.
  // Note: Needs platform-dependent factoring.
  bool status = true;

  // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
  // builds so the cost of stack banging can be measured.
#if (defined(PRODUCT) && defined(SOLARIS))
  if (!UseBoundThreads && !UseStackBanging) {
    jio_fprintf(defaultStream::error_stream(),
                "-UseStackBanging conflicts with -UseBoundThreads\n");

     status = false;
  }
#endif

  if (TLABRefillWasteFraction == 0) {
    jio_fprintf(defaultStream::error_stream(),
                "TLABRefillWasteFraction should be a denominator, "
                "not " SIZE_FORMAT "\n",
                TLABRefillWasteFraction);
    status = false;
  }

2104
  status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
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                              "AdaptiveSizePolicyWeight");
2106
  status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
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2108 2109
  // Divide by bucket size to prevent a large size from causing rollover when
  // calculating amount of memory needed to be allocated for the String table.
2110
  status = status && verify_interval(StringTableSize, minimumStringTableSize,
2111 2112
    (max_uintx / StringTable::bucket_size()), "StringTable size");

2113 2114 2115
  status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
    (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");

2116 2117 2118 2119
  {
    // Using "else if" below to avoid printing two error messages if min > max.
    // This will also prevent us from reporting both min>100 and max>100 at the
    // same time, but that is less annoying than printing two identical errors IMHO.
2120
    FormatBuffer<80> err_msg("%s","");
2121 2122 2123 2124 2125 2126 2127
    if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
      jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
      status = false;
    } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
      jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
      status = false;
    }
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  }

2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147
  // Min/MaxMetaspaceFreeRatio
  status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
  status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");

  if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
    jio_fprintf(defaultStream::error_stream(),
                "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
                "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
                FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
                MinMetaspaceFreeRatio,
                FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
                MaxMetaspaceFreeRatio);
    status = false;
  }

  // Trying to keep 100% free is not practical
  MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);

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  if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
    MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
  }

2152 2153 2154
  if (UseParallelOldGC && ParallelOldGCSplitALot) {
    // Settings to encourage splitting.
    if (!FLAG_IS_CMDLINE(NewRatio)) {
2155
      FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2156 2157 2158 2159 2160 2161
    }
    if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
      FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
    }
  }

2162 2163
  status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
  status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
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  if (GCTimeLimit == 100) {
    // Turn off gc-overhead-limit-exceeded checks
    FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
  }

2169
  status = status && check_gc_consistency();
2170
  status = status && check_stack_pages();
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  if (CMSIncrementalMode) {
    if (!UseConcMarkSweepGC) {
      jio_fprintf(defaultStream::error_stream(),
                  "error:  invalid argument combination.\n"
                  "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
                  "selected in order\nto use CMSIncrementalMode.\n");
      status = false;
    } else {
2180
      status = status && verify_percentage(CMSIncrementalDutyCycle,
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                                  "CMSIncrementalDutyCycle");
2182
      status = status && verify_percentage(CMSIncrementalDutyCycleMin,
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                                  "CMSIncrementalDutyCycleMin");
2184
      status = status && verify_percentage(CMSIncrementalSafetyFactor,
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                                  "CMSIncrementalSafetyFactor");
2186
      status = status && verify_percentage(CMSIncrementalOffset,
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                                  "CMSIncrementalOffset");
2188
      status = status && verify_percentage(CMSExpAvgFactor,
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                                  "CMSExpAvgFactor");
      // If it was not set on the command line, set
      // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
      if (CMSInitiatingOccupancyFraction < 0) {
        FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
      }
    }
  }

  // CMS space iteration, which FLSVerifyAllHeapreferences entails,
  // insists that we hold the requisite locks so that the iteration is
  // MT-safe. For the verification at start-up and shut-down, we don't
  // yet have a good way of acquiring and releasing these locks,
  // which are not visible at the CollectedHeap level. We want to
  // be able to acquire these locks and then do the iteration rather
  // than just disable the lock verification. This will be fixed under
  // bug 4788986.
  if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2207
    if (VerifyDuringStartup) {
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      warning("Heap verification at start-up disabled "
              "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2210
      VerifyDuringStartup = false; // Disable verification at start-up
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    }
2212

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    if (VerifyBeforeExit) {
      warning("Heap verification at shutdown disabled "
              "(due to current incompatibility with FLSVerifyAllHeapReferences)");
      VerifyBeforeExit = false; // Disable verification at shutdown
    }
  }

  // Note: only executed in non-PRODUCT mode
  if (!UseAsyncConcMarkSweepGC &&
      (ExplicitGCInvokesConcurrent ||
       ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
    jio_fprintf(defaultStream::error_stream(),
2225
                "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
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                " with -UseAsyncConcMarkSweepGC");
    status = false;
  }

2230 2231
  status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");

2232
#if INCLUDE_ALL_GCS
2233
  if (UseG1GC) {
2234 2235 2236 2237
    status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
    status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
    status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");

2238 2239
    status = status && verify_percentage(InitiatingHeapOccupancyPercent,
                                         "InitiatingHeapOccupancyPercent");
2240 2241 2242 2243
    status = status && verify_min_value(G1RefProcDrainInterval, 1,
                                        "G1RefProcDrainInterval");
    status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
                                        "G1ConcMarkStepDurationMillis");
2244 2245 2246 2247
    status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
                                       "G1ConcRSHotCardLimit");
    status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
                                       "G1ConcRSLogCacheSize");
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    status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
                                       "StringDeduplicationAgeThreshold");
2250
  }
2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296
  if (UseConcMarkSweepGC) {
    status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
    status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
    status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
    status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");

    status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");

    status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
    status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
    status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");

    status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");

    status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
    status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");

    status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
    status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
    status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");

    status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");

    status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");

    status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
    status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
    status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
    status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
    status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
  }

  if (UseParallelGC || UseParallelOldGC) {
    status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
    status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");

    status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
    status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");

    status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
    status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");

    status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");

    status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
  }
2297
#endif // INCLUDE_ALL_GCS
2298

2299 2300 2301 2302 2303 2304 2305 2306 2307 2308
  status = status && verify_interval(RefDiscoveryPolicy,
                                     ReferenceProcessor::DiscoveryPolicyMin,
                                     ReferenceProcessor::DiscoveryPolicyMax,
                                     "RefDiscoveryPolicy");

  // Limit the lower bound of this flag to 1 as it is used in a division
  // expression.
  status = status && verify_interval(TLABWasteTargetPercent,
                                     1, 100, "TLABWasteTargetPercent");

2309 2310
  status = status && verify_object_alignment();

2311 2312
  status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
                                      "CompressedClassSpaceSize");
2313

2314 2315
  status = status && verify_interval(MarkStackSizeMax,
                                  1, (max_jint - 1), "MarkStackSizeMax");
2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327
  status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");

  status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");

  status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");

  status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");

  status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
  status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");

  status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2328

2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349
  status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
  status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
  status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
  status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");

  status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
  status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");

  status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
  status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
  status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");

  status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
  status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");

  // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
  // just for that, so hardcode here.
  status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
  status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
  status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
  status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2350

2351
  status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2352

2353 2354
  if (PrintNMTStatistics) {
#if INCLUDE_NMT
2355
    if (MemTracker::tracking_level() == NMT_off) {
2356 2357 2358 2359 2360 2361
#endif // INCLUDE_NMT
      warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
      PrintNMTStatistics = false;
#if INCLUDE_NMT
    }
#endif
2362 2363
  }

2364 2365 2366 2367 2368 2369
  // Need to limit the extent of the padding to reasonable size.
  // 8K is well beyond the reasonable HW cache line size, even with the
  // aggressive prefetching, while still leaving the room for segregating
  // among the distinct pages.
  if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
    jio_fprintf(defaultStream::error_stream(),
2370
                "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2371 2372 2373 2374 2375 2376 2377 2378
                ContendedPaddingWidth, 0, 8192);
    status = false;
  }

  // Need to enforce the padding not to break the existing field alignments.
  // It is sufficient to check against the largest type size.
  if ((ContendedPaddingWidth % BytesPerLong) != 0) {
    jio_fprintf(defaultStream::error_stream(),
2379
                "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2380 2381 2382 2383
                ContendedPaddingWidth, BytesPerLong);
    status = false;
  }

2384 2385 2386 2387
  // Check lower bounds of the code cache
  // Template Interpreter code is approximately 3X larger in debug builds.
  uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
  if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2388
    jio_fprintf(defaultStream::error_stream(),
2389 2390 2391 2392
                "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
                os::vm_page_size()/K);
    status = false;
  } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2393
    jio_fprintf(defaultStream::error_stream(),
2394
                "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2395 2396
                ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
    status = false;
2397 2398 2399 2400 2401
  } else if (ReservedCodeCacheSize < min_code_cache_size) {
    jio_fprintf(defaultStream::error_stream(),
                "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
                min_code_cache_size/K);
    status = false;
2402 2403 2404 2405 2406 2407
  } else if (ReservedCodeCacheSize > 2*G) {
    // Code cache size larger than MAXINT is not supported.
    jio_fprintf(defaultStream::error_stream(),
                "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
                (2*G)/M);
    status = false;
2408
  }
2409 2410 2411 2412

  status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
  status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");

2413 2414 2415 2416
  if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
    warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
  }

2417 2418
  status &= check_vm_args_consistency_ext();

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  return status;
}

bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
  const char* option_type) {
  if (ignore) return false;

  const char* spacer = " ";
  if (option_type == NULL) {
    option_type = ++spacer; // Set both to the empty string.
  }

  if (os::obsolete_option(option)) {
    jio_fprintf(defaultStream::error_stream(),
                "Obsolete %s%soption: %s\n", option_type, spacer,
      option->optionString);
    return false;
  } else {
    jio_fprintf(defaultStream::error_stream(),
                "Unrecognized %s%soption: %s\n", option_type, spacer,
      option->optionString);
    return true;
  }
}

static const char* user_assertion_options[] = {
  "-da", "-ea", "-disableassertions", "-enableassertions", 0
};

static const char* system_assertion_options[] = {
  "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
};

// Return true if any of the strings in null-terminated array 'names' matches.
// If tail_allowed is true, then the tail must begin with a colon; otherwise,
// the option must match exactly.
static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
  bool tail_allowed) {
  for (/* empty */; *names != NULL; ++names) {
    if (match_option(option, *names, tail)) {
      if (**tail == '\0' || tail_allowed && **tail == ':') {
        return true;
      }
    }
  }
  return false;
}

2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489
bool Arguments::parse_uintx(const char* value,
                            uintx* uintx_arg,
                            uintx min_size) {

  // Check the sign first since atomull() parses only unsigned values.
  bool value_is_positive = !(*value == '-');

  if (value_is_positive) {
    julong n;
    bool good_return = atomull(value, &n);
    if (good_return) {
      bool above_minimum = n >= min_size;
      bool value_is_too_large = n > max_uintx;

      if (above_minimum && !value_is_too_large) {
        *uintx_arg = n;
        return true;
      }
    }
  }
  return false;
}

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Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2491 2492 2493
                                                  julong* long_arg,
                                                  julong min_size) {
  if (!atomull(s, long_arg)) return arg_unreadable;
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  return check_memory_size(*long_arg, min_size);
}

// Parse JavaVMInitArgs structure

jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
  // For components of the system classpath.
  SysClassPath scp(Arguments::get_sysclasspath());
  bool scp_assembly_required = false;

  // Save default settings for some mode flags
  Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
  Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
  Arguments::_ClipInlining             = ClipInlining;
  Arguments::_BackgroundCompilation    = BackgroundCompilation;

2510 2511 2512
  // Setup flags for mixed which is the default
  set_mode_flags(_mixed);

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  // Parse JAVA_TOOL_OPTIONS environment variable (if present)
  jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
  if (result != JNI_OK) {
    return result;
  }

  // Parse JavaVMInitArgs structure passed in
2520
  result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
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  if (result != JNI_OK) {
    return result;
  }

  // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
  result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
  if (result != JNI_OK) {
    return result;
  }

  // Do final processing now that all arguments have been parsed
  result = finalize_vm_init_args(&scp, scp_assembly_required);
  if (result != JNI_OK) {
    return result;
  }

  return JNI_OK;
}

2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588
// Checks if name in command-line argument -agent{lib,path}:name[=options]
// represents a valid HPROF of JDWP agent.  is_path==true denotes that we
// are dealing with -agentpath (case where name is a path), otherwise with
// -agentlib
bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
  char *_name;
  const char *_hprof = "hprof", *_jdwp = "jdwp";
  size_t _len_hprof, _len_jdwp, _len_prefix;

  if (is_path) {
    if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
      return false;
    }

    _name++;  // skip past last path separator
    _len_prefix = strlen(JNI_LIB_PREFIX);

    if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
      return false;
    }

    _name += _len_prefix;
    _len_hprof = strlen(_hprof);
    _len_jdwp = strlen(_jdwp);

    if (strncmp(_name, _hprof, _len_hprof) == 0) {
      _name += _len_hprof;
    }
    else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
      _name += _len_jdwp;
    }
    else {
      return false;
    }

    if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
      return false;
    }

    return true;
  }

  if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
    return true;
  }

  return false;
}

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jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
                                       SysClassPath* scp_p,
                                       bool* scp_assembly_required_p,
2592
                                       Flag::Flags origin) {
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  // Remaining part of option string
  const char* tail;

  // iterate over arguments
  for (int index = 0; index < args->nOptions; index++) {
    bool is_absolute_path = false;  // for -agentpath vs -agentlib

    const JavaVMOption* option = args->options + index;

    if (!match_option(option, "-Djava.class.path", &tail) &&
        !match_option(option, "-Dsun.java.command", &tail) &&
        !match_option(option, "-Dsun.java.launcher", &tail)) {

        // add all jvm options to the jvm_args string. This string
        // is used later to set the java.vm.args PerfData string constant.
        // the -Djava.class.path and the -Dsun.java.command options are
        // omitted from jvm_args string as each have their own PerfData
        // string constant object.
        build_jvm_args(option->optionString);
    }

    // -verbose:[class/gc/jni]
    if (match_option(option, "-verbose", &tail)) {
      if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
        FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
        FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
      } else if (!strcmp(tail, ":gc")) {
        FLAG_SET_CMDLINE(bool, PrintGC, true);
      } else if (!strcmp(tail, ":jni")) {
        FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
      }
    // -da / -ea / -disableassertions / -enableassertions
    // These accept an optional class/package name separated by a colon, e.g.,
    // -da:java.lang.Thread.
    } else if (match_option(option, user_assertion_options, &tail, true)) {
      bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
      if (*tail == '\0') {
        JavaAssertions::setUserClassDefault(enable);
      } else {
        assert(*tail == ':', "bogus match by match_option()");
        JavaAssertions::addOption(tail + 1, enable);
      }
    // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
    } else if (match_option(option, system_assertion_options, &tail, false)) {
      bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
      JavaAssertions::setSystemClassDefault(enable);
    // -bootclasspath:
    } else if (match_option(option, "-Xbootclasspath:", &tail)) {
      scp_p->reset_path(tail);
      *scp_assembly_required_p = true;
    // -bootclasspath/a:
    } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
      scp_p->add_suffix(tail);
      *scp_assembly_required_p = true;
    // -bootclasspath/p:
    } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
      scp_p->add_prefix(tail);
      *scp_assembly_required_p = true;
    // -Xrun
    } else if (match_option(option, "-Xrun", &tail)) {
2653
      if (tail != NULL) {
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        const char* pos = strchr(tail, ':');
        size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
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        char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
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        name[len] = '\0';

        char *options = NULL;
        if(pos != NULL) {
          size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
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          options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
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        }
2664
#if !INCLUDE_JVMTI
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        if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2666 2667 2668 2669
          jio_fprintf(defaultStream::error_stream(),
            "Profiling and debugging agents are not supported in this VM\n");
          return JNI_ERR;
        }
2670
#endif // !INCLUDE_JVMTI
2671
        add_init_library(name, options);
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      }
    // -agentlib and -agentpath
    } else if (match_option(option, "-agentlib:", &tail) ||
          (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
      if(tail != NULL) {
        const char* pos = strchr(tail, '=');
        size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
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        char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
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        name[len] = '\0';

        char *options = NULL;
        if(pos != NULL) {
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          options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
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        }
2686
#if !INCLUDE_JVMTI
2687
        if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2688 2689 2690 2691
          jio_fprintf(defaultStream::error_stream(),
            "Profiling and debugging agents are not supported in this VM\n");
          return JNI_ERR;
        }
2692
#endif // !INCLUDE_JVMTI
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        add_init_agent(name, options, is_absolute_path);
      }
    // -javaagent
    } else if (match_option(option, "-javaagent:", &tail)) {
2697
#if !INCLUDE_JVMTI
2698 2699 2700
      jio_fprintf(defaultStream::error_stream(),
        "Instrumentation agents are not supported in this VM\n");
      return JNI_ERR;
2701
#else
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      if(tail != NULL) {
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        char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
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        add_init_agent("instrument", options, false);
      }
2706
#endif // !INCLUDE_JVMTI
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    // -Xnoclassgc
    } else if (match_option(option, "-Xnoclassgc", &tail)) {
      FLAG_SET_CMDLINE(bool, ClassUnloading, false);
    // -Xincgc: i-CMS
    } else if (match_option(option, "-Xincgc", &tail)) {
      FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
      FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
    // -Xnoincgc: no i-CMS
    } else if (match_option(option, "-Xnoincgc", &tail)) {
      FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
      FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
    // -Xconcgc
    } else if (match_option(option, "-Xconcgc", &tail)) {
      FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
    // -Xnoconcgc
    } else if (match_option(option, "-Xnoconcgc", &tail)) {
      FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
    // -Xbatch
    } else if (match_option(option, "-Xbatch", &tail)) {
      FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
    // -Xmn for compatibility with other JVM vendors
    } else if (match_option(option, "-Xmn", &tail)) {
2729 2730
      julong long_initial_young_size = 0;
      ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
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      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
2733
                    "Invalid initial young generation size: %s\n", option->optionString);
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        describe_range_error(errcode);
        return JNI_EINVAL;
      }
2737 2738
      FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
      FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
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    // -Xms
    } else if (match_option(option, "-Xms", &tail)) {
2741
      julong long_initial_heap_size = 0;
2742 2743
      // an initial heap size of 0 means automatically determine
      ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
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      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
                    "Invalid initial heap size: %s\n", option->optionString);
        describe_range_error(errcode);
        return JNI_EINVAL;
      }
2750
      set_min_heap_size((uintx)long_initial_heap_size);
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      // Currently the minimum size and the initial heap sizes are the same.
2752 2753
      // Can be overridden with -XX:InitialHeapSize.
      FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
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    // -Xmx
2755
    } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2756
      julong long_max_heap_size = 0;
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      ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
                    "Invalid maximum heap size: %s\n", option->optionString);
        describe_range_error(errcode);
        return JNI_EINVAL;
      }
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      FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
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    // Xmaxf
    } else if (match_option(option, "-Xmaxf", &tail)) {
2767 2768
      char* err;
      int maxf = (int)(strtod(tail, &err) * 100);
2769
      if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
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        jio_fprintf(defaultStream::error_stream(),
                    "Bad max heap free percentage size: %s\n",
                    option->optionString);
        return JNI_EINVAL;
      } else {
        FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
      }
    // Xminf
    } else if (match_option(option, "-Xminf", &tail)) {
2779 2780
      char* err;
      int minf = (int)(strtod(tail, &err) * 100);
2781
      if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
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        jio_fprintf(defaultStream::error_stream(),
                    "Bad min heap free percentage size: %s\n",
                    option->optionString);
        return JNI_EINVAL;
      } else {
        FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
      }
    // -Xss
    } else if (match_option(option, "-Xss", &tail)) {
2791
      julong long_ThreadStackSize = 0;
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      ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
                    "Invalid thread stack size: %s\n", option->optionString);
        describe_range_error(errcode);
        return JNI_EINVAL;
      }
      // Internally track ThreadStackSize in units of 1024 bytes.
      FLAG_SET_CMDLINE(intx, ThreadStackSize,
                              round_to((int)long_ThreadStackSize, K) / K);
    // -Xoss
    } else if (match_option(option, "-Xoss", &tail)) {
          // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2805 2806 2807 2808 2809 2810 2811 2812 2813 2814
    } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
      julong long_CodeCacheExpansionSize = 0;
      ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
                   "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
                   os::vm_page_size()/K);
        return JNI_EINVAL;
      }
      FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2815 2816
    } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
               match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2817
      julong long_ReservedCodeCacheSize = 0;
2818

2819
      ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
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      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
2822
                    "Invalid maximum code cache size: %s.\n", option->optionString);
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        return JNI_EINVAL;
      }
      FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2826 2827 2828 2829 2830 2831 2832 2833 2834 2835
      //-XX:IncreaseFirstTierCompileThresholdAt=
      } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
        uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
        if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
          jio_fprintf(defaultStream::error_stream(),
                      "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
                      option->optionString);
          return JNI_EINVAL;
        }
        FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
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    // -green
    } else if (match_option(option, "-green", &tail)) {
      jio_fprintf(defaultStream::error_stream(),
                  "Green threads support not available\n");
          return JNI_EINVAL;
    // -native
    } else if (match_option(option, "-native", &tail)) {
          // HotSpot always uses native threads, ignore silently for compatibility
    // -Xsqnopause
    } else if (match_option(option, "-Xsqnopause", &tail)) {
          // EVM option, ignore silently for compatibility
    // -Xrs
    } else if (match_option(option, "-Xrs", &tail)) {
          // Classic/EVM option, new functionality
      FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
    } else if (match_option(option, "-Xusealtsigs", &tail)) {
          // change default internal VM signals used - lower case for back compat
      FLAG_SET_CMDLINE(bool, UseAltSigs, true);
    // -Xoptimize
    } else if (match_option(option, "-Xoptimize", &tail)) {
          // EVM option, ignore silently for compatibility
    // -Xprof
    } else if (match_option(option, "-Xprof", &tail)) {
2859
#if INCLUDE_FPROF
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      _has_profile = true;
2861
#else // INCLUDE_FPROF
2862 2863 2864
      jio_fprintf(defaultStream::error_stream(),
        "Flat profiling is not supported in this VM.\n");
      return JNI_ERR;
2865
#endif // INCLUDE_FPROF
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    // -Xconcurrentio
    } else if (match_option(option, "-Xconcurrentio", &tail)) {
      FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
      FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
      FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
      FLAG_SET_CMDLINE(bool, UseTLAB, false);
      FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation

      // -Xinternalversion
    } else if (match_option(option, "-Xinternalversion", &tail)) {
      jio_fprintf(defaultStream::output_stream(), "%s\n",
                  VM_Version::internal_vm_info_string());
      vm_exit(0);
#ifndef PRODUCT
    // -Xprintflags
    } else if (match_option(option, "-Xprintflags", &tail)) {
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      CommandLineFlags::printFlags(tty, false);
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      vm_exit(0);
#endif
    // -D
    } else if (match_option(option, "-D", &tail)) {
      if (!add_property(tail)) {
        return JNI_ENOMEM;
      }
      // Out of the box management support
      if (match_option(option, "-Dcom.sun.management", &tail)) {
2892
#if INCLUDE_MANAGEMENT
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        FLAG_SET_CMDLINE(bool, ManagementServer, true);
2894
#else
2895 2896 2897
        jio_fprintf(defaultStream::output_stream(),
          "-Dcom.sun.management is not supported in this VM.\n");
        return JNI_ERR;
2898
#endif
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      }
    // -Xint
    } else if (match_option(option, "-Xint", &tail)) {
          set_mode_flags(_int);
    // -Xmixed
    } else if (match_option(option, "-Xmixed", &tail)) {
          set_mode_flags(_mixed);
    // -Xcomp
    } else if (match_option(option, "-Xcomp", &tail)) {
      // for testing the compiler; turn off all flags that inhibit compilation
          set_mode_flags(_comp);
    // -Xshare:dump
    } else if (match_option(option, "-Xshare:dump", &tail)) {
      FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
      set_mode_flags(_int);     // Prevent compilation, which creates objects
    // -Xshare:on
    } else if (match_option(option, "-Xshare:on", &tail)) {
      FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
      FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
    // -Xshare:auto
    } else if (match_option(option, "-Xshare:auto", &tail)) {
      FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
      FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
    // -Xshare:off
    } else if (match_option(option, "-Xshare:off", &tail)) {
      FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
      FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
    // -Xverify
    } else if (match_option(option, "-Xverify", &tail)) {
      if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
        FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
        FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
      } else if (strcmp(tail, ":remote") == 0) {
        FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
        FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
      } else if (strcmp(tail, ":none") == 0) {
        FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
        FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
      } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
        return JNI_EINVAL;
      }
    // -Xdebug
    } else if (match_option(option, "-Xdebug", &tail)) {
      // note this flag has been used, then ignore
      set_xdebug_mode(true);
    // -Xnoagent
    } else if (match_option(option, "-Xnoagent", &tail)) {
      // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
    } else if (match_option(option, "-Xboundthreads", &tail)) {
      // Bind user level threads to kernel threads (Solaris only)
      FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
    } else if (match_option(option, "-Xloggc:", &tail)) {
      // Redirect GC output to the file. -Xloggc:<filename>
      // ostream_init_log(), when called will use this filename
      // to initialize a fileStream.
      _gc_log_filename = strdup(tail);
2955 2956 2957 2958 2959 2960 2961
     if (!is_filename_valid(_gc_log_filename)) {
       jio_fprintf(defaultStream::output_stream(),
                  "Invalid file name for use with -Xloggc: Filename can only contain the "
                  "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
                  "Note %%p or %%t can only be used once\n", _gc_log_filename);
        return JNI_EINVAL;
      }
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      FLAG_SET_CMDLINE(bool, PrintGC, true);
      FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);

    // JNI hooks
    } else if (match_option(option, "-Xcheck", &tail)) {
      if (!strcmp(tail, ":jni")) {
2968 2969 2970
#if !INCLUDE_JNI_CHECK
        warning("JNI CHECKING is not supported in this VM");
#else
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        CheckJNICalls = true;
2972
#endif // INCLUDE_JNI_CHECK
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      } else if (is_bad_option(option, args->ignoreUnrecognized,
                                     "check")) {
        return JNI_EINVAL;
      }
    } else if (match_option(option, "vfprintf", &tail)) {
      _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
    } else if (match_option(option, "exit", &tail)) {
      _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
    } else if (match_option(option, "abort", &tail)) {
      _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
    // -XX:+AggressiveHeap
    } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {

      // This option inspects the machine and attempts to set various
      // parameters to be optimal for long-running, memory allocation
      // intensive jobs.  It is intended for machines with large
      // amounts of cpu and memory.

      // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
      // VM, but we may not be able to represent the total physical memory
      // available (like having 8gb of memory on a box but using a 32bit VM).
      // Thus, we need to make sure we're using a julong for intermediate
      // calculations.
      julong initHeapSize;
      julong total_memory = os::physical_memory();

      if (total_memory < (julong)256*M) {
        jio_fprintf(defaultStream::error_stream(),
                    "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
        vm_exit(1);
      }

      // The heap size is half of available memory, or (at most)
      // all of possible memory less 160mb (leaving room for the OS
      // when using ISM).  This is the maximum; because adaptive sizing
      // is turned on below, the actual space used may be smaller.

      initHeapSize = MIN2(total_memory / (julong)2,
                          total_memory - (julong)160*M);

3013
      initHeapSize = limit_by_allocatable_memory(initHeapSize);
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3014 3015 3016

      if (FLAG_IS_DEFAULT(MaxHeapSize)) {
         FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
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3017
         FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
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         // Currently the minimum size and the initial heap sizes are the same.
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3019
         set_min_heap_size(initHeapSize);
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3020 3021 3022 3023 3024 3025 3026 3027
      }
      if (FLAG_IS_DEFAULT(NewSize)) {
         // Make the young generation 3/8ths of the total heap.
         FLAG_SET_CMDLINE(uintx, NewSize,
                                ((julong)MaxHeapSize / (julong)8) * (julong)3);
         FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
      }

3028
#ifndef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
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3029
      FLAG_SET_DEFAULT(UseLargePages, true);
3030
#endif
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3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058

      // Increase some data structure sizes for efficiency
      FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
      FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
      FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);

      // See the OldPLABSize comment below, but replace 'after promotion'
      // with 'after copying'.  YoungPLABSize is the size of the survivor
      // space per-gc-thread buffers.  The default is 4kw.
      FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words

      // OldPLABSize is the size of the buffers in the old gen that
      // UseParallelGC uses to promote live data that doesn't fit in the
      // survivor spaces.  At any given time, there's one for each gc thread.
      // The default size is 1kw. These buffers are rarely used, since the
      // survivor spaces are usually big enough.  For specjbb, however, there
      // are occasions when there's lots of live data in the young gen
      // and we end up promoting some of it.  We don't have a definite
      // explanation for why bumping OldPLABSize helps, but the theory
      // is that a bigger PLAB results in retaining something like the
      // original allocation order after promotion, which improves mutator
      // locality.  A minor effect may be that larger PLABs reduce the
      // number of PLAB allocation events during gc.  The value of 8kw
      // was arrived at by experimenting with specjbb.
      FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words

      // Enable parallel GC and adaptive generation sizing
      FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3059 3060
      FLAG_SET_DEFAULT(ParallelGCThreads,
                       Abstract_VM_Version::parallel_worker_threads());
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3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111

      // Encourage steady state memory management
      FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);

      // This appears to improve mutator locality
      FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);

      // Get around early Solaris scheduling bug
      // (affinity vs other jobs on system)
      // but disallow DR and offlining (5008695).
      FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);

    } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
      // The last option must always win.
      FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
      FLAG_SET_CMDLINE(bool, NeverTenure, true);
    } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
      // The last option must always win.
      FLAG_SET_CMDLINE(bool, NeverTenure, false);
      FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
    } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
               match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
      jio_fprintf(defaultStream::error_stream(),
        "Please use CMSClassUnloadingEnabled in place of "
        "CMSPermGenSweepingEnabled in the future\n");
    } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
      FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
      jio_fprintf(defaultStream::error_stream(),
        "Please use -XX:+UseGCOverheadLimit in place of "
        "-XX:+UseGCTimeLimit in the future\n");
    } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
      FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
      jio_fprintf(defaultStream::error_stream(),
        "Please use -XX:-UseGCOverheadLimit in place of "
        "-XX:-UseGCTimeLimit in the future\n");
    // The TLE options are for compatibility with 1.3 and will be
    // removed without notice in a future release.  These options
    // are not to be documented.
    } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
      // No longer used.
    } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
      FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
    } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
      FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
    } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
      FLAG_SET_CMDLINE(bool, PrintTLAB, true);
    } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
      FLAG_SET_CMDLINE(bool, PrintTLAB, false);
    } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
      // No longer used.
    } else if (match_option(option, "-XX:TLESize=", &tail)) {
3112
      julong long_tlab_size = 0;
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3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133
      ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
                    "Invalid TLAB size: %s\n", option->optionString);
        describe_range_error(errcode);
        return JNI_EINVAL;
      }
      FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
    } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
      // No longer used.
    } else if (match_option(option, "-XX:+UseTLE", &tail)) {
      FLAG_SET_CMDLINE(bool, UseTLAB, true);
    } else if (match_option(option, "-XX:-UseTLE", &tail)) {
      FLAG_SET_CMDLINE(bool, UseTLAB, false);
    } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
      FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
      FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
    } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
      FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
      FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
    } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
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#if defined(DTRACE_ENABLED)
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3135 3136 3137 3138
      FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
      FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
      FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
      FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
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3139
#else // defined(DTRACE_ENABLED)
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3140
      jio_fprintf(defaultStream::error_stream(),
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                  "ExtendedDTraceProbes flag is not applicable for this configuration\n");
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3142
      return JNI_EINVAL;
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3143
#endif // defined(DTRACE_ENABLED)
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3144
#ifdef ASSERT
3145
    } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
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3146 3147 3148 3149
      FLAG_SET_CMDLINE(bool, FullGCALot, true);
      // disable scavenge before parallel mark-compact
      FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
#endif
3150
    } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
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      julong cms_blocks_to_claim = (julong)atol(tail);
      FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
      jio_fprintf(defaultStream::error_stream(),
3154 3155 3156 3157 3158 3159 3160
        "Please use -XX:OldPLABSize in place of "
        "-XX:CMSParPromoteBlocksToClaim in the future\n");
    } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
      julong cms_blocks_to_claim = (julong)atol(tail);
      FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
      jio_fprintf(defaultStream::error_stream(),
        "Please use -XX:OldPLABSize in place of "
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3161
        "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3162
    } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3163
      julong old_plab_size = 0;
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3164 3165 3166 3167 3168 3169 3170
      ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
                    "Invalid old PLAB size: %s\n", option->optionString);
        describe_range_error(errcode);
        return JNI_EINVAL;
      }
3171
      FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
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3172 3173 3174
      jio_fprintf(defaultStream::error_stream(),
                  "Please use -XX:OldPLABSize in place of "
                  "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3175
    } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3176
      julong young_plab_size = 0;
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3177 3178 3179 3180 3181 3182 3183
      ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
                    "Invalid young PLAB size: %s\n", option->optionString);
        describe_range_error(errcode);
        return JNI_EINVAL;
      }
3184
      FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
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3185 3186 3187
      jio_fprintf(defaultStream::error_stream(),
                  "Please use -XX:YoungPLABSize in place of "
                  "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218
    } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
               match_option(option, "-XX:G1MarkStackSize=", &tail)) {
      julong stack_size = 0;
      ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
                    "Invalid mark stack size: %s\n", option->optionString);
        describe_range_error(errcode);
        return JNI_EINVAL;
      }
      FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
    } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
      julong max_stack_size = 0;
      ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
                    "Invalid maximum mark stack size: %s\n",
                    option->optionString);
        describe_range_error(errcode);
        return JNI_EINVAL;
      }
      FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
    } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
               match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
      uintx conc_threads = 0;
      if (!parse_uintx(tail, &conc_threads, 1)) {
        jio_fprintf(defaultStream::error_stream(),
                    "Invalid concurrent threads: %s\n", option->optionString);
        return JNI_EINVAL;
      }
      FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229
    } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
      julong max_direct_memory_size = 0;
      ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
                    "Invalid maximum direct memory size: %s\n",
                    option->optionString);
        describe_range_error(errcode);
        return JNI_EINVAL;
      }
      FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3230 3231 3232 3233 3234
    } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
      // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
      //       away and will cause VM initialization failures!
      warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
      FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3235 3236
#if !INCLUDE_MANAGEMENT
    } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3237 3238 3239
        jio_fprintf(defaultStream::error_stream(),
          "ManagementServer is not supported in this VM.\n");
        return JNI_ERR;
3240
#endif // INCLUDE_MANAGEMENT
3241
    } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
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3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252
      // Skip -XX:Flags= since that case has already been handled
      if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
        if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
          return JNI_EINVAL;
        }
      }
    // Unknown option
    } else if (is_bad_option(option, args->ignoreUnrecognized)) {
      return JNI_ERR;
    }
  }
3253

3254 3255
  // Change the default value for flags  which have different default values
  // when working with older JDKs.
3256 3257 3258 3259 3260 3261
#ifdef LINUX
 if (JDK_Version::current().compare_major(6) <= 0 &&
      FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
    FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
  }
#endif // LINUX
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  return JNI_OK;
}

jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
  // This must be done after all -D arguments have been processed.
  scp_p->expand_endorsed();

  if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
    // Assemble the bootclasspath elements into the final path.
    Arguments::set_sysclasspath(scp_p->combined_path());
  }

  // This must be done after all arguments have been processed.
  // java_compiler() true means set to "NONE" or empty.
  if (java_compiler() && !xdebug_mode()) {
    // For backwards compatibility, we switch to interpreted mode if
    // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
    // not specified.
    set_mode_flags(_int);
  }
  if (CompileThreshold == 0) {
    set_mode_flags(_int);
  }

3286 3287 3288 3289 3290
  // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
  if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
    FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
  }

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3291 3292 3293 3294 3295 3296 3297 3298 3299
#ifndef COMPILER2
  // Don't degrade server performance for footprint
  if (FLAG_IS_DEFAULT(UseLargePages) &&
      MaxHeapSize < LargePageHeapSizeThreshold) {
    // No need for large granularity pages w/small heaps.
    // Note that large pages are enabled/disabled for both the
    // Java heap and the code cache.
    FLAG_SET_DEFAULT(UseLargePages, false);
  }
3300

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3301 3302 3303 3304 3305 3306
#else
  if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
    FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
  }
#endif

3307 3308 3309 3310 3311
#ifndef TIERED
  // Tiered compilation is undefined.
  UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
#endif

3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333
  // If we are running in a headless jre, force java.awt.headless property
  // to be true unless the property has already been set.
  // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
  if (os::is_headless_jre()) {
    const char* headless = Arguments::get_property("java.awt.headless");
    if (headless == NULL) {
      char envbuffer[128];
      if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
        if (!add_property("java.awt.headless=true")) {
          return JNI_ENOMEM;
        }
      } else {
        char buffer[256];
        strcpy(buffer, "java.awt.headless=");
        strcat(buffer, envbuffer);
        if (!add_property(buffer)) {
          return JNI_ENOMEM;
        }
      }
    }
  }

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3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405
  if (!check_vm_args_consistency()) {
    return JNI_ERR;
  }

  return JNI_OK;
}

jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
  return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
                                            scp_assembly_required_p);
}

jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
  return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
                                            scp_assembly_required_p);
}

jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
  const int N_MAX_OPTIONS = 64;
  const int OPTION_BUFFER_SIZE = 1024;
  char buffer[OPTION_BUFFER_SIZE];

  // The variable will be ignored if it exceeds the length of the buffer.
  // Don't check this variable if user has special privileges
  // (e.g. unix su command).
  if (os::getenv(name, buffer, sizeof(buffer)) &&
      !os::have_special_privileges()) {
    JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
    jio_fprintf(defaultStream::error_stream(),
                "Picked up %s: %s\n", name, buffer);
    char* rd = buffer;                        // pointer to the input string (rd)
    int i;
    for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
      while (isspace(*rd)) rd++;              // skip whitespace
      if (*rd == 0) break;                    // we re done when the input string is read completely

      // The output, option string, overwrites the input string.
      // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
      // input string (rd).
      char* wrt = rd;

      options[i++].optionString = wrt;        // Fill in option
      while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
        if (*rd == '\'' || *rd == '"') {      // handle a quoted string
          int quote = *rd;                    // matching quote to look for
          rd++;                               // don't copy open quote
          while (*rd != quote) {              // include everything (even spaces) up until quote
            if (*rd == 0) {                   // string termination means unmatched string
              jio_fprintf(defaultStream::error_stream(),
                          "Unmatched quote in %s\n", name);
              return JNI_ERR;
            }
            *wrt++ = *rd++;                   // copy to option string
          }
          rd++;                               // don't copy close quote
        } else {
          *wrt++ = *rd++;                     // copy to option string
        }
      }
      // Need to check if we're done before writing a NULL,
      // because the write could be to the byte that rd is pointing to.
      if (*rd++ == 0) {
        *wrt = 0;
        break;
      }
      *wrt = 0;                               // Zero terminate option
    }
    // Construct JavaVMInitArgs structure and parse as if it was part of the command line
    JavaVMInitArgs vm_args;
    vm_args.version = JNI_VERSION_1_2;
    vm_args.options = options;
    vm_args.nOptions = i;
3406
    vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
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3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417

    if (PrintVMOptions) {
      const char* tail;
      for (int i = 0; i < vm_args.nOptions; i++) {
        const JavaVMOption *option = vm_args.options + i;
        if (match_option(option, "-XX:", &tail)) {
          logOption(tail);
        }
      }
    }

3418
    return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
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3419 3420 3421 3422
  }
  return JNI_OK;
}

3423
void Arguments::set_shared_spaces_flags() {
3424 3425 3426 3427 3428
  if (DumpSharedSpaces) {
    if (RequireSharedSpaces) {
      warning("cannot dump shared archive while using shared archive");
    }
    UseSharedSpaces = false;
3429
#ifdef _LP64
3430
    if (!UseCompressedOops || !UseCompressedClassPointers) {
3431
      vm_exit_during_initialization(
3432
        "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3433 3434
    }
  } else {
3435 3436
    // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
    if (!UseCompressedOops || !UseCompressedClassPointers) {
3437 3438 3439
      no_shared_spaces();
    }
#endif
3440
  }
3441
}
3442

3443
#if !INCLUDE_ALL_GCS
3444 3445 3446 3447 3448 3449 3450 3451 3452
static void force_serial_gc() {
  FLAG_SET_DEFAULT(UseSerialGC, true);
  FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
  UNSUPPORTED_GC_OPTION(UseG1GC);
  UNSUPPORTED_GC_OPTION(UseParallelGC);
  UNSUPPORTED_GC_OPTION(UseParallelOldGC);
  UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
  UNSUPPORTED_GC_OPTION(UseParNewGC);
}
3453
#endif // INCLUDE_ALL_GCS
3454

3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481
// Sharing support
// Construct the path to the archive
static char* get_shared_archive_path() {
  char *shared_archive_path;
  if (SharedArchiveFile == NULL) {
    char jvm_path[JVM_MAXPATHLEN];
    os::jvm_path(jvm_path, sizeof(jvm_path));
    char *end = strrchr(jvm_path, *os::file_separator());
    if (end != NULL) *end = '\0';
    size_t jvm_path_len = strlen(jvm_path);
    size_t file_sep_len = strlen(os::file_separator());
    shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
        file_sep_len + 20, mtInternal);
    if (shared_archive_path != NULL) {
      strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
      strncat(shared_archive_path, os::file_separator(), file_sep_len);
      strncat(shared_archive_path, "classes.jsa", 11);
    }
  } else {
    shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
    if (shared_archive_path != NULL) {
      strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
    }
  }
  return shared_archive_path;
}

3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508
#ifndef PRODUCT
// Determine whether LogVMOutput should be implicitly turned on.
static bool use_vm_log() {
  if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
      PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
      PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
      PrintAssembly || TraceDeoptimization || TraceDependencies ||
      (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
    return true;
  }

#ifdef COMPILER1
  if (PrintC1Statistics) {
    return true;
  }
#endif // COMPILER1

#ifdef COMPILER2
  if (PrintOptoAssembly || PrintOptoStatistics) {
    return true;
  }
#endif // COMPILER2

  return false;
}
#endif // PRODUCT

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3509 3510 3511 3512 3513 3514 3515 3516
// Parse entry point called from JNI_CreateJavaVM

jint Arguments::parse(const JavaVMInitArgs* args) {

  // Remaining part of option string
  const char* tail;

  // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3517
  const char* hotspotrc = ".hotspotrc";
D
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3518
  bool settings_file_specified = false;
3519 3520
  bool needs_hotspotrc_warning = false;

3521
  const char* flags_file;
D
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3522 3523 3524 3525
  int index;
  for (index = 0; index < args->nOptions; index++) {
    const JavaVMOption *option = args->options + index;
    if (match_option(option, "-XX:Flags=", &tail)) {
3526
      flags_file = tail;
D
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3527 3528 3529 3530 3531
      settings_file_specified = true;
    }
    if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
      PrintVMOptions = true;
    }
3532 3533 3534
    if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
      PrintVMOptions = false;
    }
3535 3536 3537 3538 3539 3540
    if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
      IgnoreUnrecognizedVMOptions = true;
    }
    if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
      IgnoreUnrecognizedVMOptions = false;
    }
3541
    if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
F
fparain 已提交
3542
      CommandLineFlags::printFlags(tty, false);
3543 3544
      vm_exit(0);
    }
3545
#if INCLUDE_NMT
3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560
    if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
      // The launcher did not setup nmt environment variable properly.
//      if (!MemTracker::check_launcher_nmt_support(tail)) {
//        warning("Native Memory Tracking did not setup properly, using wrong launcher?");
//      }

      // Verify if nmt option is valid.
      if (MemTracker::verify_nmt_option()) {
        // Late initialization, still in single-threaded mode.
        if (MemTracker::tracking_level() >= NMT_summary) {
          MemTracker::init();
        }
      } else {
        vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
      }
Z
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3561
    }
3562
#endif
Z
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3563

3564 3565 3566

#ifndef PRODUCT
    if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
F
fparain 已提交
3567
      CommandLineFlags::printFlags(tty, true);
3568 3569 3570
      vm_exit(0);
    }
#endif
3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582
  }

  if (IgnoreUnrecognizedVMOptions) {
    // uncast const to modify the flag args->ignoreUnrecognized
    *(jboolean*)(&args->ignoreUnrecognized) = true;
  }

  // Parse specified settings file
  if (settings_file_specified) {
    if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
      return JNI_EINVAL;
    }
3583
  } else {
3584
#ifdef ASSERT
3585
    // Parse default .hotspotrc settings file
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3586 3587 3588
    if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
      return JNI_EINVAL;
    }
3589 3590 3591 3592 3593
#else
    struct stat buf;
    if (os::stat(hotspotrc, &buf) == 0) {
      needs_hotspotrc_warning = true;
    }
3594
#endif
3595
  }
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3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611

  if (PrintVMOptions) {
    for (index = 0; index < args->nOptions; index++) {
      const JavaVMOption *option = args->options + index;
      if (match_option(option, "-XX:", &tail)) {
        logOption(tail);
      }
    }
  }

  // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
  jint result = parse_vm_init_args(args);
  if (result != JNI_OK) {
    return result;
  }

3612 3613 3614 3615 3616 3617
  // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
  SharedArchivePath = get_shared_archive_path();
  if (SharedArchivePath == NULL) {
    return JNI_ENOMEM;
  }

3618 3619 3620 3621 3622 3623 3624 3625
  // Delay warning until here so that we've had a chance to process
  // the -XX:-PrintWarnings flag
  if (needs_hotspotrc_warning) {
    warning("%s file is present but has been ignored.  "
            "Run with -XX:Flags=%s to load the file.",
            hotspotrc, hotspotrc);
  }

3626 3627 3628 3629
#ifdef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
  UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
#endif

3630 3631 3632 3633 3634
#if INCLUDE_ALL_GCS
  #if (defined JAVASE_EMBEDDED || defined ARM)
    UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
  #endif
#endif
3635

D
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3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647
#ifndef PRODUCT
  if (TraceBytecodesAt != 0) {
    TraceBytecodes = true;
  }
  if (CountCompiledCalls) {
    if (UseCounterDecay) {
      warning("UseCounterDecay disabled because CountCalls is set");
      UseCounterDecay = false;
    }
  }
#endif // PRODUCT

3648 3649 3650 3651 3652 3653 3654
  // JSR 292 is not supported before 1.7
  if (!JDK_Version::is_gte_jdk17x_version()) {
    if (EnableInvokeDynamic) {
      if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
        warning("JSR 292 is not supported before 1.7.  Disabling support.");
      }
      EnableInvokeDynamic = false;
3655 3656
    }
  }
3657 3658

  if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3659
    if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3660
      warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3661 3662 3663
    }
    ScavengeRootsInCode = 1;
  }
3664

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3665 3666 3667 3668 3669
  if (PrintGCDetails) {
    // Turn on -verbose:gc options as well
    PrintGC = true;
  }

3670 3671 3672 3673 3674 3675 3676 3677
  if (!JDK_Version::is_gte_jdk18x_version()) {
    // To avoid changing the log format for 7 updates this flag is only
    // true by default in JDK8 and above.
    if (FLAG_IS_DEFAULT(PrintGCCause)) {
      FLAG_SET_DEFAULT(PrintGCCause, false);
    }
  }

3678 3679 3680
  // Set object alignment values.
  set_object_alignment();

3681
#if !INCLUDE_ALL_GCS
P
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3682
  force_serial_gc();
3683
#endif // INCLUDE_ALL_GCS
3684
#if !INCLUDE_CDS
3685 3686 3687 3688 3689
  if (DumpSharedSpaces || RequireSharedSpaces) {
    jio_fprintf(defaultStream::error_stream(),
      "Shared spaces are not supported in this VM\n");
    return JNI_ERR;
  }
3690
  if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3691 3692 3693 3694
    warning("Shared spaces are not supported in this VM");
    FLAG_SET_DEFAULT(UseSharedSpaces, false);
    FLAG_SET_DEFAULT(PrintSharedSpaces, false);
  }
D
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3695
  no_shared_spaces();
3696
#endif // INCLUDE_CDS
D
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3697

3698 3699 3700 3701 3702
  return JNI_OK;
}

jint Arguments::apply_ergo() {

D
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3703 3704 3705
  // Set flags based on ergonomics.
  set_ergonomics_flags();

3706
  set_shared_spaces_flags();
3707

3708 3709 3710 3711 3712
  // Check the GC selections again.
  if (!check_gc_consistency()) {
    return JNI_EINVAL;
  }

I
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3713 3714 3715 3716 3717 3718 3719 3720 3721
  if (TieredCompilation) {
    set_tiered_flags();
  } else {
    // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
    if (CompilationPolicyChoice >= 2) {
      vm_exit_during_initialization(
        "Incompatible compilation policy selected", NULL);
    }
  }
3722 3723 3724 3725 3726
  // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
  if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
    FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
  }

I
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3727

3728 3729
  // Set heap size based on available physical memory
  set_heap_size();
3730

3731
#if INCLUDE_ALL_GCS
3732 3733 3734
  // Set per-collector flags
  if (UseParallelGC || UseParallelOldGC) {
    set_parallel_gc_flags();
3735
  } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3736
    set_cms_and_parnew_gc_flags();
3737
  } else if (UseParNewGC) {  // Skipped if CMS is set above
3738 3739 3740
    set_parnew_gc_flags();
  } else if (UseG1GC) {
    set_g1_gc_flags();
3741
  }
3742
  check_deprecated_gcs();
T
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3743
  check_deprecated_gc_flags();
3744 3745 3746 3747 3748 3749 3750
  if (AssumeMP && !UseSerialGC) {
    if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
      warning("If the number of processors is expected to increase from one, then"
              " you should configure the number of parallel GC threads appropriately"
              " using -XX:ParallelGCThreads=N");
    }
  }
3751 3752 3753 3754
  if (MinHeapFreeRatio == 100) {
    // Keeping the heap 100% free is hard ;-) so limit it to 99%.
    FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
  }
3755
#else // INCLUDE_ALL_GCS
D
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3756
  assert(verify_serial_gc_flags(), "SerialGC unset");
3757
#endif // INCLUDE_ALL_GCS
D
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3758

3759 3760 3761
  // Initialize Metaspace flags and alignments.
  Metaspace::ergo_initialize();

D
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3762 3763 3764 3765 3766 3767
  // Set bytecode rewriting flags
  set_bytecode_flags();

  // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
  set_aggressive_opts_flags();

3768 3769 3770
  // Turn off biased locking for locking debug mode flags,
  // which are subtlely different from each other but neither works with
  // biased locking.
3771 3772 3773 3774 3775
  if (UseHeavyMonitors
#ifdef COMPILER1
      || !UseFastLocking
#endif // COMPILER1
    ) {
3776 3777 3778 3779 3780 3781 3782 3783 3784
    if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
      // flag set to true on command line; warn the user that they
      // can't enable biased locking here
      warning("Biased Locking is not supported with locking debug flags"
              "; ignoring UseBiasedLocking flag." );
    }
    UseBiasedLocking = false;
  }

3785 3786
#ifdef ZERO
  // Clear flags not supported on zero.
T
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3787
  FLAG_SET_DEFAULT(ProfileInterpreter, false);
D
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3788
  FLAG_SET_DEFAULT(UseBiasedLocking, false);
T
twisti 已提交
3789
  LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3790
  LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
T
twisti 已提交
3791 3792
#endif // CC_INTERP

3793
#ifdef COMPILER2
K
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3794 3795 3796
  if (!EliminateLocks) {
    EliminateNestedLocks = false;
  }
R
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3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808
  if (!Inline) {
    IncrementalInline = false;
  }
#ifndef PRODUCT
  if (!IncrementalInline) {
    AlwaysIncrementalInline = false;
  }
#endif
  if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
    // incremental inlining: bump MaxNodeLimit
    FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
  }
3809 3810 3811 3812
  if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
    // nothing to use the profiling, turn if off
    FLAG_SET_DEFAULT(TypeProfileLevel, 0);
  }
3813 3814
#endif

3815 3816 3817 3818 3819
  if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
    warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
    DebugNonSafepoints = true;
  }

3820 3821 3822 3823
  if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
    warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
  }

3824 3825 3826 3827 3828 3829 3830
#ifndef PRODUCT
  if (CompileTheWorld) {
    // Force NmethodSweeper to sweep whole CodeCache each time.
    if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
      NmethodSweepFraction = 1;
    }
  }
3831 3832 3833 3834 3835 3836 3837

  if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
    if (use_vm_log()) {
      LogVMOutput = true;
    }
  }
#endif // PRODUCT
3838

D
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3839
  if (PrintCommandLineFlags) {
F
fparain 已提交
3840
    CommandLineFlags::printSetFlags(tty);
D
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3841 3842
  }

3843 3844 3845 3846 3847 3848 3849
  // Apply CPU specific policy for the BiasedLocking
  if (UseBiasedLocking) {
    if (!VM_Version::use_biased_locking() &&
        !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
      UseBiasedLocking = false;
    }
  }
3850 3851 3852 3853 3854
#ifdef COMPILER2
  if (!UseBiasedLocking || EmitSync != 0) {
    UseOptoBiasInlining = false;
  }
#endif
3855

3856 3857 3858 3859 3860 3861 3862 3863 3864 3865
  // set PauseAtExit if the gamma launcher was used and a debugger is attached
  // but only if not already set on the commandline
  if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
    bool set = false;
    CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
    if (!set) {
      FLAG_SET_DEFAULT(PauseAtExit, true);
    }
  }

D
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3866 3867 3868
  return JNI_OK;
}

3869
jint Arguments::adjust_after_os() {
3870 3871
  if (UseNUMA) {
    if (UseParallelGC || UseParallelOldGC) {
3872
      if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3873
         FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3874
      }
3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885
    }
    // UseNUMAInterleaving is set to ON for all collectors and
    // platforms when UseNUMA is set to ON. NUMA-aware collectors
    // such as the parallel collector for Linux and Solaris will
    // interleave old gen and survivor spaces on top of NUMA
    // allocation policy for the eden space.
    // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
    // all platforms and ParallelGC on Windows will interleave all
    // of the heap spaces across NUMA nodes.
    if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
      FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3886 3887 3888 3889 3890
    }
  }
  return JNI_OK;
}

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3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961
int Arguments::PropertyList_count(SystemProperty* pl) {
  int count = 0;
  while(pl != NULL) {
    count++;
    pl = pl->next();
  }
  return count;
}

const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
  assert(key != NULL, "just checking");
  SystemProperty* prop;
  for (prop = pl; prop != NULL; prop = prop->next()) {
    if (strcmp(key, prop->key()) == 0) return prop->value();
  }
  return NULL;
}

const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
  int count = 0;
  const char* ret_val = NULL;

  while(pl != NULL) {
    if(count >= index) {
      ret_val = pl->key();
      break;
    }
    count++;
    pl = pl->next();
  }

  return ret_val;
}

char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
  int count = 0;
  char* ret_val = NULL;

  while(pl != NULL) {
    if(count >= index) {
      ret_val = pl->value();
      break;
    }
    count++;
    pl = pl->next();
  }

  return ret_val;
}

void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
  SystemProperty* p = *plist;
  if (p == NULL) {
    *plist = new_p;
  } else {
    while (p->next() != NULL) {
      p = p->next();
    }
    p->set_next(new_p);
  }
}

void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
  if (plist == NULL)
    return;

  SystemProperty* new_p = new SystemProperty(k, v, true);
  PropertyList_add(plist, new_p);
}

// This add maintains unique property key in the list.
P
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3962
void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
D
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3963 3964 3965 3966 3967 3968 3969
  if (plist == NULL)
    return;

  // If property key exist then update with new value.
  SystemProperty* prop;
  for (prop = *plist; prop != NULL; prop = prop->next()) {
    if (strcmp(k, prop->key()) == 0) {
P
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3970 3971 3972 3973 3974
      if (append) {
        prop->append_value(v);
      } else {
        prop->set_value(v);
      }
D
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3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034
      return;
    }
  }

  PropertyList_add(plist, k, v);
}

// Copies src into buf, replacing "%%" with "%" and "%p" with pid
// Returns true if all of the source pointed by src has been copied over to
// the destination buffer pointed by buf. Otherwise, returns false.
// Notes:
// 1. If the length (buflen) of the destination buffer excluding the
// NULL terminator character is not long enough for holding the expanded
// pid characters, it also returns false instead of returning the partially
// expanded one.
// 2. The passed in "buflen" should be large enough to hold the null terminator.
bool Arguments::copy_expand_pid(const char* src, size_t srclen,
                                char* buf, size_t buflen) {
  const char* p = src;
  char* b = buf;
  const char* src_end = &src[srclen];
  char* buf_end = &buf[buflen - 1];

  while (p < src_end && b < buf_end) {
    if (*p == '%') {
      switch (*(++p)) {
      case '%':         // "%%" ==> "%"
        *b++ = *p++;
        break;
      case 'p':  {       //  "%p" ==> current process id
        // buf_end points to the character before the last character so
        // that we could write '\0' to the end of the buffer.
        size_t buf_sz = buf_end - b + 1;
        int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());

        // if jio_snprintf fails or the buffer is not long enough to hold
        // the expanded pid, returns false.
        if (ret < 0 || ret >= (int)buf_sz) {
          return false;
        } else {
          b += ret;
          assert(*b == '\0', "fail in copy_expand_pid");
          if (p == src_end && b == buf_end + 1) {
            // reach the end of the buffer.
            return true;
          }
        }
        p++;
        break;
      }
      default :
        *b++ = '%';
      }
    } else {
      *b++ = *p++;
    }
  }
  *b = '\0';
  return (p == src_end); // return false if not all of the source was copied
}