arguments.cpp 164.6 KB
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/*
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 * Copyright (c) 1997, 2017, 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"
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#include "classfile/classLoader.hpp"
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#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"
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#include "runtime/arguments_ext.hpp"
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#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/stringUtils.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
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#define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.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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  { "CompilationRepeat",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
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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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      size_t length = directory_len + 2 + strlen(name);
      char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal);
      jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name);
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      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);
}

644
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) {
657
  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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    size_t length = old_len + 1 + new_len + 1;
    char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal);
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    // each new setting adds another LINE to the switch:
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    jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
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    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;
  }
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  size_t length = 0;
  for (int i = 0; i < count; i++) {
    length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
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  }
  char* s = NEW_RESOURCE_ARRAY(char, length);
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  char* dst = s;
  for (int j = 0; j < count; j++) {
    size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
    jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
    dst += offset;
    length -= offset;
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  }
  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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876 877
  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.

888 889 890 891 892 893 894 895
  size_t arg_len;
  const char* equal_sign = strchr(argname, '=');
  if (equal_sign == NULL) {
    arg_len = strlen(argname);
  } else {
    arg_len = equal_sign - argname;
  }

896
  Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
897
  if (found_flag != NULL) {
898
    char locked_message_buf[BUFLEN];
899
    found_flag->get_locked_message(locked_message_buf, BUFLEN);
900
    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()) ? "(+/-)" : "",
922
                  fuzzy_matched->_name,
923 924
                  (fuzzy_matched->is_bool()) ? "" : "=<value>");
    }
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  }

927 928
  // 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;

1030
    // 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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1032 1033 1034 1035 1036 1037 1038 1039
    // 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",
1066
                          (char*)VM_Version::vm_info_string(), false);
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  UseInterpreter             = true;
  UseCompiler                = true;
  UseLoopCounter             = true;

1072 1073 1074
#ifndef ZERO
  // Turn these off for mixed and comp.  Leave them on for Zero.
  if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1075
    UseFastAccessorMethods = (mode == _int);
1076 1077
  }
  if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1078
    UseFastEmptyMethods = (mode == _int);
1079 1080 1081
  }
#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;
1107 1108 1109 1110 1111 1112 1113
    // 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;
  }
}

1118
#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.

1122
static void no_shared_spaces(const char* message) {
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  if (RequireSharedSpaces) {
    jio_fprintf(defaultStream::error_stream(),
      "Class data sharing is inconsistent with other specified options.\n");
1126
    vm_exit_during_initialization("Unable to use shared archive.", message);
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  } else {
    FLAG_SET_DEFAULT(UseSharedSpaces, false);
  }
}
1131
#endif
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void Arguments::set_tiered_flags() {
1134
  // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
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  if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1136
    FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
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1137 1138 1139 1140 1141
  }
  if (CompilationPolicyChoice < 2) {
    vm_exit_during_initialization(
      "Incompatible compilation policy selected", NULL);
  }
1142
  // Increase the code cache size - tiered compiles a lot more.
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  if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1144
    FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
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1145
  }
1146 1147 1148 1149
  if (!UseInterpreter) { // -Xcomp
    Tier3InvokeNotifyFreqLog = 0;
    Tier4InvocationThreshold = 0;
  }
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}

1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177
/**
 * Returns the minimum number of compiler threads needed to run the JVM. The following
 * configurations are possible.
 *
 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
 *    compiler threads is 0.
 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
 *    a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
 *    the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
 *    C1 can be used, so the minimum number of compiler threads is 1.
 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
 *    'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
 *    the minimum number of compiler threads is 2.
 */
int Arguments::get_min_number_of_compiler_threads() {
#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
  return 0;   // case 1
#else
  if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
    return 1; // case 2 or case 3
  }
  return 2;   // case 4 (tiered)
#endif
}

1178
#if INCLUDE_ALL_GCS
1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
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,
1191 1192
         "control point invariant");
  assert(UseParNewGC, "Error");
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1194 1195
  // Turn off AdaptiveSizePolicy for parnew until it is complete.
  disable_adaptive_size_policy("UseParNewGC");
1196

1197 1198 1199 1200 1201 1202 1203
  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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1204 1205
  }

1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227
  // 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");
1228
    }
1229
    FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
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1230
  }
1231
  assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
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1232 1233 1234 1235 1236 1237 1238
}

// 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");
1240 1241
  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.
1244
  if (FLAG_IS_DEFAULT(UseParNewGC)) {
1245
    FLAG_SET_ERGO(bool, UseParNewGC, true);
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  }

1248
  // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1249
  disable_adaptive_size_policy("UseConcMarkSweepGC");
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1250 1251 1252

  // In either case, adjust ParallelGCThreads and/or UseParNewGC
  // as needed.
1253 1254
  if (UseParNewGC) {
    set_parnew_gc_flags();
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  }

1257 1258 1259
  size_t max_heap = align_size_down(MaxHeapSize,
                                    CardTableRS::ct_max_alignment_constraint());

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  // Now make adjustments for CMS
1261 1262 1263 1264 1265
  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 =
1269 1270
    MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
  size_t preferred_max_new_size =
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    align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());

  // Unless explicitly requested otherwise, size young gen
1274
  // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1275 1276 1277 1278 1279 1280 1281 1282

  // 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
1284
      FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
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    } else {
1286
      FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
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1287
    }
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    if (PrintGCDetails && Verbose) {
1289
      // Too early to use gclog_or_tty
1290
      tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1291 1292 1293
    }

    // Code along this path potentially sets NewSize and OldSize
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    if (PrintGCDetails && Verbose) {
1295 1296 1297 1298
      // 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);
1300
    }
1301 1302 1303 1304 1305
    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)) {
1309 1310
        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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1311
        if (PrintGCDetails && Verbose) {
1312
          // Too early to use gclog_or_tty
1313
          tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1314
        }
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1315 1316
      }
      // Unless explicitly requested otherwise, size old gen
1317
      // so it's NewRatio x of NewSize.
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1318 1319
      if (FLAG_IS_DEFAULT(OldSize)) {
        if (max_heap > NewSize) {
1320
          FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
P
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1321
          if (PrintGCDetails && Verbose) {
1322
            // Too early to use gclog_or_tty
1323
            tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1324
          }
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1325 1326 1327 1328 1329 1330 1331 1332
        }
      }
    }
  }
  // Unless explicitly requested otherwise, definitely
  // promote all objects surviving "tenuring_default" scavenges.
  if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
      FLAG_IS_DEFAULT(SurvivorRatio)) {
1333
    FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
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1334 1335 1336 1337 1338 1339
  }
  // 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) {
1340
    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)) {
1349 1350 1351 1352 1353
      // 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);
1354
    } else {
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1355 1356 1357 1358
      // 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(),
1359 1360 1361
                  "Both OldPLABSize and CMSParPromoteBlocksToClaim"
                  " options are specified for the CMS collector."
                  " CMSParPromoteBlocksToClaim will take precedence.\n");
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1362 1363
    }
  }
1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
  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);
  }
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  if (!ClassUnloading) {
    FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
    FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
  }

1385 1386
  if (PrintGCDetails && Verbose) {
    tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1387 1388
      (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
    tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1389
  }
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1390
}
1391
#endif // INCLUDE_ALL_GCS
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1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
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;

1408
#if INCLUDE_ALL_GCS
1409 1410
  // Set CMS global values
  CompactibleFreeListSpace::set_cms_values();
1411
#endif // INCLUDE_ALL_GCS
1412 1413 1414 1415 1416 1417
}

bool verify_object_alignment() {
  // Object alignment.
  if (!is_power_of_2(ObjectAlignmentInBytes)) {
    jio_fprintf(defaultStream::error_stream(),
1418 1419
                "error: ObjectAlignmentInBytes=%d must be power of 2\n",
                (int)ObjectAlignmentInBytes);
1420 1421 1422 1423
    return false;
  }
  if ((int)ObjectAlignmentInBytes < BytesPerLong) {
    jio_fprintf(defaultStream::error_stream(),
1424 1425 1426 1427 1428 1429 1430 1431 1432
                "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(),
1433
                "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1434 1435 1436 1437 1438 1439
                (int)ObjectAlignmentInBytes);
    return false;
  }
  // In case page size is very small.
  if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
    jio_fprintf(defaultStream::error_stream(),
1440
                "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1441
                (int)ObjectAlignmentInBytes, os::vm_page_size());
1442 1443
    return false;
  }
1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459
  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;
    }
  }
1460 1461 1462
  return true;
}

1463
size_t Arguments::max_heap_for_compressed_oops() {
1464
  // Avoid sign flip.
1465
  assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1466 1467 1468 1469 1470
  // 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(),
1471
                                                        _conservative_max_heap_alignment);
1472 1473

  LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
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  NOT_LP64(ShouldNotReachHere(); return 0);
1475 1476
}

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1477 1478 1479 1480 1481 1482 1483
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"
1484
       " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
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1485 1486 1487 1488 1489 1490
    }
    return true;
  }
  return false;
}

1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517
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);
1518
      FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1519 1520 1521 1522 1523 1524
    }
  }
#endif // _LP64
#endif // ZERO
}

1525 1526 1527 1528 1529 1530

// 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
1531
  // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1532
  if (!UseCompressedOops) {
1533 1534
    if (UseCompressedClassPointers) {
      warning("UseCompressedClassPointers requires UseCompressedOops");
1535
    }
1536
    FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1537
  } else {
1538 1539 1540 1541 1542 1543 1544 1545 1546
    // 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);
1547 1548 1549 1550 1551 1552 1553
      }
    }
  }
#endif // _LP64
#endif // !ZERO
}

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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
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  _conservative_max_heap_alignment = MAX4(heap_alignment,
                                          (size_t)os::vm_allocation_granularity(),
                                          os::max_page_size(),
                                          CollectorPolicy::compute_heap_alignment());
1571 1572
}

1573
void Arguments::select_gc_ergonomically() {
1574
  if (os::is_server_class_machine()) {
1575 1576 1577 1578
    if (should_auto_select_low_pause_collector()) {
      FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
    } else {
      FLAG_SET_ERGO(bool, UseParallelGC, true);
1579
    }
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  }
1581 1582 1583 1584
}

void Arguments::select_gc() {
  if (!gc_selected()) {
1585
    select_gc_ergonomically();
1586 1587 1588 1589 1590 1591
  }
}

void Arguments::set_ergonomics_flags() {
  select_gc();

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#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)) {
1600
    no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1601 1602
  }
#endif
1603

1604 1605
  set_conservative_max_heap_alignment();

1606
#ifndef ZERO
1607
#ifdef _LP64
1608
  set_use_compressed_oops();
1609 1610 1611 1612 1613

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

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  // Also checks that certain machines are slower with compressed oops
  // in vm_version initialization code.
#endif // _LP64
1617
#endif // !ZERO
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}

void Arguments::set_parallel_gc_flags() {
1621
  assert(UseParallelGC || UseParallelOldGC, "Error");
1622 1623 1624
  // 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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  }
1626
  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.
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  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);
  }
1637

1638 1639 1640 1641 1642
  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);
1643
      _min_heap_free_ratio = MinHeapFreeRatio;
1644 1645 1646
    }
    if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
      FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1647
      _max_heap_free_ratio = MaxHeapFreeRatio;
1648 1649
    }
  }
1650 1651 1652 1653 1654 1655 1656 1657

  // 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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    }
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    if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
      FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
    }
  }
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  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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    }
  }
}

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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) {
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    vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
    }
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#if INCLUDE_ALL_GCS
  if (G1ConcRefinementThreads == 0) {
    FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
  }
#endif

1691 1692 1693 1694 1695 1696
  // 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);
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  }
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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);
  }
1708 1709 1710

  if (PrintGCDetails && Verbose) {
    tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1711 1712
      (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
    tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1713
  }
1714 1715
}

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#if !INCLUDE_ALL_GCS
#ifdef ASSERT
static bool verify_serial_gc_flags() {
  return (UseSerialGC &&
        !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
          UseParallelGC || UseParallelOldGC));
}
#endif // ASSERT
#endif // INCLUDE_ALL_GCS

void Arguments::set_gc_specific_flags() {
#if INCLUDE_ALL_GCS
  // Set per-collector flags
  if (UseParallelGC || UseParallelOldGC) {
    set_parallel_gc_flags();
  } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
    set_cms_and_parnew_gc_flags();
  } else if (UseParNewGC) {  // Skipped if CMS is set above
    set_parnew_gc_flags();
  } else if (UseG1GC) {
    set_g1_gc_flags();
  }
  check_deprecated_gcs();
  check_deprecated_gc_flags();
  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");
    }
  }
  if (MinHeapFreeRatio == 100) {
    // Keeping the heap 100% free is hard ;-) so limit it to 99%.
    FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
  }
#else // INCLUDE_ALL_GCS
  assert(verify_serial_gc_flags(), "SerialGC unset");
#endif // INCLUDE_ALL_GCS
}

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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);
  }

1771
  julong phys_mem =
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    FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
                            : (julong)MaxRAM;

1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803
  // Experimental support for CGroup memory limits
  if (UseCGroupMemoryLimitForHeap) {
    // This is a rough indicator that a CGroup limit may be in force
    // for this process
    const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
    FILE *fp = fopen(lim_file, "r");
    if (fp != NULL) {
      julong cgroup_max = 0;
      int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
      if (ret == 1 && cgroup_max > 0) {
        // If unlimited, cgroup_max will be a very large, but unspecified
        // value, so use initial phys_mem as a limit
        if (PrintGCDetails && Verbose) {
          // Cannot use gclog_or_tty yet.
          tty->print_cr("Setting phys_mem to the min of cgroup limit ("
                        JULONG_FORMAT "MB) and initial phys_mem ("
                        JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
        }
        phys_mem = MIN2(cgroup_max, phys_mem);
      } else {
        warning("Unable to read/parse cgroup memory limit from %s: %s",
                lim_file, errno != 0 ? strerror(errno) : "unknown error");
      }
      fclose(fp);
    } else {
      warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
    }
  }

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  // 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.
1807
  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
1824 1825 1826 1827 1828 1829 1830
      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);
1831
    }
1832
    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
1837
      // 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);
    }

1842 1843
    if (PrintGCDetails && Verbose) {
      // Cannot use gclog_or_tty yet.
1844
      tty->print_cr("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1845
    }
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    FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
  }

1849 1850 1851
  // 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) {
1852 1853 1854 1855
    julong reasonable_minimum = (julong)(OldSize + NewSize);

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

1856
    reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1857

1858 1859
    if (InitialHeapSize == 0) {
      julong reasonable_initial = phys_mem / InitialRAMFraction;
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1861 1862
      reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
      reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
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1864
      reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
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1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879
      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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    }
1881 1882 1883
  }
}

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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() {
1900
#ifdef COMPILER2
1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914
  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;
    }
  }
1915 1916 1917 1918 1919 1920 1921 1922 1923 1924
  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];
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    jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1926 1927
    add_property(buffer);
  }
1928 1929 1930
  if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
    FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
  }
1931 1932
#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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  }
}

//===========================================================================================================
// 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);
1955 1956 1957
  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;
}

1965 1966 1967 1968
bool Arguments::created_by_gamma_launcher() {
  return _created_by_gamma_launcher;
}

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

1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985
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;
}

1986
bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1987
  // Returns true if given value is at least specified min threshold
1988 1989 1990 1991 1992
  // false, otherwise.
  if (val >= min ) {
      return true;
  }
  jio_fprintf(defaultStream::error_stream(),
1993
              "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1994 1995 1996 1997
              name, val, min);
  return false;
}

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bool Arguments::verify_percentage(uintx value, const char* name) {
1999
  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;
}

2008 2009 2010
// check if do gclog rotation
// +UseGCLogFileRotation is a must,
// no gc log rotation when log file not supplied or
2011
// NumberOfGCLogFiles is 0
2012 2013
void check_gclog_consistency() {
  if (UseGCLogFileRotation) {
2014
    if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2015
      jio_fprintf(defaultStream::output_stream(),
2016 2017
                  "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
                  "where num_of_file > 0\n"
2018 2019 2020 2021 2022
                  "GC log rotation is turned off\n");
      UseGCLogFileRotation = false;
    }
  }

2023 2024 2025 2026
  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");
2027 2028 2029
  }
}

2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074
// 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;
}

2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085
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;
  }
2086 2087
  // 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;
2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101
  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;
  }
2102 2103
  // 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;
2104 2105 2106
  return true;
}

2107
// Check consistency of GC selection
2108
bool Arguments::check_gc_consistency() {
2109
  check_gclog_consistency();
2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121
  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++;
2122
  if (UseG1GC)                           i++;
2123 2124 2125 2126 2127 2128 2129 2130 2131 2132
  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;
}

2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144
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");
  }
2145 2146 2147 2148

  if (CMSIncrementalMode) {
    warning("Using incremental CMS is deprecated and will likely be removed in a future release");
  }
2149 2150
}

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2151 2152 2153 2154 2155
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");
  }
2156 2157 2158 2159
  if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
    warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
        "Use MaxRAMFraction instead.");
  }
2160 2161 2162 2163 2164 2165 2166 2167 2168
  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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2169 2170
}

2171 2172 2173 2174 2175 2176
// 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");
2177 2178
  // greater stack shadow pages can't generate instruction to bang stack
  status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2179 2180 2181
  return status;
}

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2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208
// 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;
  }

2209
  status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
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2210
                              "AdaptiveSizePolicyWeight");
2211
  status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
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2212

2213 2214
  // 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.
2215
  status = status && verify_interval(StringTableSize, minimumStringTableSize,
2216 2217
    (max_uintx / StringTable::bucket_size()), "StringTable size");

2218 2219 2220
  status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
    (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");

2221 2222 2223 2224
  {
    // 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.
2225
    FormatBuffer<80> err_msg("%s","");
2226 2227 2228 2229 2230 2231 2232
    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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2233 2234
  }

2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252
  // 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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2253 2254 2255 2256
  if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
    MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
  }

2257 2258 2259
  if (UseParallelOldGC && ParallelOldGCSplitALot) {
    // Settings to encourage splitting.
    if (!FLAG_IS_CMDLINE(NewRatio)) {
2260
      FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2261 2262 2263 2264 2265 2266
    }
    if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
      FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
    }
  }

2267 2268
  status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
  status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
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2269 2270 2271 2272 2273
  if (GCTimeLimit == 100) {
    // Turn off gc-overhead-limit-exceeded checks
    FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
  }

2274
  status = status && check_gc_consistency();
2275
  status = status && check_stack_pages();
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2276 2277 2278 2279 2280 2281 2282 2283 2284

  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 {
2285
      status = status && verify_percentage(CMSIncrementalDutyCycle,
D
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2286
                                  "CMSIncrementalDutyCycle");
2287
      status = status && verify_percentage(CMSIncrementalDutyCycleMin,
D
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2288
                                  "CMSIncrementalDutyCycleMin");
2289
      status = status && verify_percentage(CMSIncrementalSafetyFactor,
D
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2290
                                  "CMSIncrementalSafetyFactor");
2291
      status = status && verify_percentage(CMSIncrementalOffset,
D
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2292
                                  "CMSIncrementalOffset");
2293
      status = status && verify_percentage(CMSExpAvgFactor,
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2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311
                                  "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) {
2312
    if (VerifyDuringStartup) {
D
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2313 2314
      warning("Heap verification at start-up disabled "
              "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2315
      VerifyDuringStartup = false; // Disable verification at start-up
D
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2316
    }
2317

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2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329
    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(),
2330
                "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
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2331 2332 2333 2334
                " with -UseAsyncConcMarkSweepGC");
    status = false;
  }

2335 2336
  status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");

2337
#if INCLUDE_ALL_GCS
2338
  if (UseG1GC) {
2339 2340 2341 2342
    status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
    status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
    status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");

2343 2344
    status = status && verify_percentage(InitiatingHeapOccupancyPercent,
                                         "InitiatingHeapOccupancyPercent");
2345 2346 2347 2348
    status = status && verify_min_value(G1RefProcDrainInterval, 1,
                                        "G1RefProcDrainInterval");
    status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
                                        "G1ConcMarkStepDurationMillis");
2349 2350
    status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
                                       "G1ConcRSHotCardLimit");
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2351
    status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2352
                                       "G1ConcRSLogCacheSize");
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2353 2354
    status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
                                       "StringDeduplicationAgeThreshold");
2355
  }
2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401
  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");
  }
2402
#endif // INCLUDE_ALL_GCS
2403

2404 2405 2406 2407 2408 2409 2410 2411 2412 2413
  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");

2414 2415
  status = status && verify_object_alignment();

2416 2417
  status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
                                      "CompressedClassSpaceSize");
2418

2419 2420
  status = status && verify_interval(MarkStackSizeMax,
                                  1, (max_jint - 1), "MarkStackSizeMax");
2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432
  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");
2433

2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454
  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");
2455

2456
  status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2457 2458 2459
#ifdef COMPILER1
  status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
#endif
2460

2461 2462
  if (PrintNMTStatistics) {
#if INCLUDE_NMT
2463
    if (MemTracker::tracking_level() == NMT_off) {
2464 2465 2466 2467 2468 2469
#endif // INCLUDE_NMT
      warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
      PrintNMTStatistics = false;
#if INCLUDE_NMT
    }
#endif
2470 2471
  }

2472 2473 2474 2475 2476 2477
  // 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(),
2478
                "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2479 2480 2481 2482 2483 2484 2485 2486
                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(),
2487
                "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2488 2489 2490 2491
                ContendedPaddingWidth, BytesPerLong);
    status = false;
  }

2492 2493 2494 2495
  // 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()) {
2496
    jio_fprintf(defaultStream::error_stream(),
2497 2498 2499 2500
                "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
                os::vm_page_size()/K);
    status = false;
  } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2501
    jio_fprintf(defaultStream::error_stream(),
2502
                "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2503 2504
                ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
    status = false;
2505 2506 2507 2508 2509
  } 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;
2510 2511 2512 2513 2514 2515
  } 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;
2516
  }
2517 2518 2519 2520

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

2521 2522 2523 2524
  if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
    warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
  }

2525
#ifdef COMPILER1
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  status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2527
#endif
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2529 2530 2531 2532 2533
  int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
  // The default CICompilerCount's value is CI_COMPILER_COUNT.
  assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
  // Check the minimum number of compiler threads
  status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2534

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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;
}

2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605
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,
2607 2608 2609
                                                  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;

2626 2627 2628
  // 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
2636
  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;
}

2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704
// 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,
2708
                                       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)) {
2769
      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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2772
        char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
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2773 2774 2775 2776 2777
        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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2778
          options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
D
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2779
        }
2780
#if !INCLUDE_JVMTI
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2781
        if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2782 2783 2784 2785
          jio_fprintf(defaultStream::error_stream(),
            "Profiling and debugging agents are not supported in this VM\n");
          return JNI_ERR;
        }
2786
#endif // !INCLUDE_JVMTI
2787
        add_init_library(name, options);
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2788 2789 2790 2791 2792 2793 2794
      }
    // -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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2795
        char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
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2796 2797 2798 2799
        name[len] = '\0';

        char *options = NULL;
        if(pos != NULL) {
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2800 2801 2802
          size_t length = strlen(pos + 1) + 1;
          options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
          jio_snprintf(options, length, "%s", pos + 1);
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2803
        }
2804
#if !INCLUDE_JVMTI
2805
        if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2806 2807 2808 2809
          jio_fprintf(defaultStream::error_stream(),
            "Profiling and debugging agents are not supported in this VM\n");
          return JNI_ERR;
        }
2810
#endif // !INCLUDE_JVMTI
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2811 2812 2813 2814
        add_init_agent(name, options, is_absolute_path);
      }
    // -javaagent
    } else if (match_option(option, "-javaagent:", &tail)) {
2815
#if !INCLUDE_JVMTI
2816 2817 2818
      jio_fprintf(defaultStream::error_stream(),
        "Instrumentation agents are not supported in this VM\n");
      return JNI_ERR;
2819
#else
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2820
      if(tail != NULL) {
S
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2821 2822 2823
        size_t length = strlen(tail) + 1;
        char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
        jio_snprintf(options, length, "%s", tail);
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2824 2825
        add_init_agent("instrument", options, false);
      }
2826
#endif // !INCLUDE_JVMTI
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2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848
    // -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)) {
2849 2850
      julong long_initial_young_size = 0;
      ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
D
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2851 2852
      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
2853
                    "Invalid initial young generation size: %s\n", option->optionString);
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2854 2855 2856
        describe_range_error(errcode);
        return JNI_EINVAL;
      }
2857 2858
      FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
      FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
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2859 2860
    // -Xms
    } else if (match_option(option, "-Xms", &tail)) {
2861
      julong long_initial_heap_size = 0;
2862 2863
      // an initial heap size of 0 means automatically determine
      ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
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2864 2865 2866 2867 2868 2869
      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;
      }
2870
      set_min_heap_size((uintx)long_initial_heap_size);
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2871
      // Currently the minimum size and the initial heap sizes are the same.
2872 2873
      // Can be overridden with -XX:InitialHeapSize.
      FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
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2874
    // -Xmx
2875
    } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2876
      julong long_max_heap_size = 0;
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2877 2878 2879 2880 2881 2882 2883
      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;
      }
P
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2884
      FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
D
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2885 2886
    // Xmaxf
    } else if (match_option(option, "-Xmaxf", &tail)) {
2887 2888
      char* err;
      int maxf = (int)(strtod(tail, &err) * 100);
2889
      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)) {
2899 2900
      char* err;
      int minf = (int)(strtod(tail, &err) * 100);
2901
      if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
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2902 2903 2904 2905 2906 2907 2908 2909 2910
        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)) {
2911
      julong long_ThreadStackSize = 0;
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2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924
      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
2925 2926 2927 2928 2929 2930 2931 2932 2933 2934
    } 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);
2935 2936
    } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
               match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2937
      julong long_ReservedCodeCacheSize = 0;
2938

2939
      ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
D
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2940 2941
      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
2942
                    "Invalid maximum code cache size: %s.\n", option->optionString);
D
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2943 2944 2945
        return JNI_EINVAL;
      }
      FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2946 2947 2948 2949 2950 2951 2952 2953 2954 2955
      //-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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2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978
    // -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)) {
2979
#if INCLUDE_FPROF
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2980
      _has_profile = true;
2981
#else // INCLUDE_FPROF
2982 2983 2984
      jio_fprintf(defaultStream::error_stream(),
        "Flat profiling is not supported in this VM.\n");
      return JNI_ERR;
2985
#endif // INCLUDE_FPROF
D
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2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001
    // -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)) {
F
fparain 已提交
3002
      CommandLineFlags::printFlags(tty, false);
D
duke 已提交
3003 3004 3005 3006
      vm_exit(0);
#endif
    // -D
    } else if (match_option(option, "-D", &tail)) {
3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023
      if (CheckEndorsedAndExtDirs) {
        if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
          // abort if -Djava.endorsed.dirs is set
          jio_fprintf(defaultStream::output_stream(),
            "-Djava.endorsed.dirs will not be supported in a future release.\n"
            "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
          return JNI_EINVAL;
        }
        if (match_option(option, "-Djava.ext.dirs=", &tail)) {
          // abort if -Djava.ext.dirs is set
          jio_fprintf(defaultStream::output_stream(),
            "-Djava.ext.dirs will not be supported in a future release.\n"
            "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
          return JNI_EINVAL;
        }
      }

D
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3024 3025 3026 3027 3028
      if (!add_property(tail)) {
        return JNI_ENOMEM;
      }
      // Out of the box management support
      if (match_option(option, "-Dcom.sun.management", &tail)) {
3029
#if INCLUDE_MANAGEMENT
D
duke 已提交
3030
        FLAG_SET_CMDLINE(bool, ManagementServer, true);
3031
#else
3032 3033 3034
        jio_fprintf(defaultStream::output_stream(),
          "-Dcom.sun.management is not supported in this VM.\n");
        return JNI_ERR;
3035
#endif
D
duke 已提交
3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 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
      }
    // -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);
3092 3093 3094 3095 3096 3097 3098
     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;
      }
D
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3099 3100 3101 3102 3103 3104
      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")) {
3105 3106 3107
#if !INCLUDE_JNI_CHECK
        warning("JNI CHECKING is not supported in this VM");
#else
D
duke 已提交
3108
        CheckJNICalls = true;
3109
#endif // INCLUDE_JNI_CHECK
D
duke 已提交
3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149
      } 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);

3150
      initHeapSize = limit_by_allocatable_memory(initHeapSize);
D
duke 已提交
3151 3152 3153

      if (FLAG_IS_DEFAULT(MaxHeapSize)) {
         FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
P
phh 已提交
3154
         FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
D
duke 已提交
3155
         // Currently the minimum size and the initial heap sizes are the same.
P
phh 已提交
3156
         set_min_heap_size(initHeapSize);
D
duke 已提交
3157 3158 3159 3160 3161 3162 3163 3164
      }
      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);
      }

3165
#ifndef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
D
duke 已提交
3166
      FLAG_SET_DEFAULT(UseLargePages, true);
3167
#endif
D
duke 已提交
3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195

      // 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);
3196 3197
      FLAG_SET_DEFAULT(ParallelGCThreads,
                       Abstract_VM_Version::parallel_worker_threads());
D
duke 已提交
3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248

      // 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)) {
3249
      julong long_tlab_size = 0;
D
duke 已提交
3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270
      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)) {
D
dcubed 已提交
3271
#if defined(DTRACE_ENABLED)
D
duke 已提交
3272 3273 3274 3275
      FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
      FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
      FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
      FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
D
dcubed 已提交
3276
#else // defined(DTRACE_ENABLED)
D
duke 已提交
3277
      jio_fprintf(defaultStream::error_stream(),
D
dcubed 已提交
3278
                  "ExtendedDTraceProbes flag is not applicable for this configuration\n");
D
duke 已提交
3279
      return JNI_EINVAL;
D
dcubed 已提交
3280
#endif // defined(DTRACE_ENABLED)
D
duke 已提交
3281
#ifdef ASSERT
3282
    } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
D
duke 已提交
3283 3284 3285 3286
      FLAG_SET_CMDLINE(bool, FullGCALot, true);
      // disable scavenge before parallel mark-compact
      FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
#endif
3287
    } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
D
duke 已提交
3288 3289 3290
      julong cms_blocks_to_claim = (julong)atol(tail);
      FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
      jio_fprintf(defaultStream::error_stream(),
3291 3292 3293 3294 3295 3296 3297
        "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 "
D
duke 已提交
3298
        "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3299
    } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3300
      julong old_plab_size = 0;
D
duke 已提交
3301 3302 3303 3304 3305 3306 3307
      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;
      }
3308
      FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
D
duke 已提交
3309 3310 3311
      jio_fprintf(defaultStream::error_stream(),
                  "Please use -XX:OldPLABSize in place of "
                  "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3312
    } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3313
      julong young_plab_size = 0;
D
duke 已提交
3314 3315 3316 3317 3318 3319 3320
      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;
      }
3321
      FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
D
duke 已提交
3322 3323 3324
      jio_fprintf(defaultStream::error_stream(),
                  "Please use -XX:YoungPLABSize in place of "
                  "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355
    } 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);
3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366
    } 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);
3367 3368 3369 3370 3371
    } 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);
3372 3373
#if !INCLUDE_MANAGEMENT
    } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3374 3375 3376
        jio_fprintf(defaultStream::error_stream(),
          "ManagementServer is not supported in this VM.\n");
        return JNI_ERR;
3377
#endif // INCLUDE_MANAGEMENT
3378
    } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
D
duke 已提交
3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389
      // 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;
    }
  }
3390

3391 3392 3393 3394 3395 3396 3397 3398 3399
  // PrintSharedArchiveAndExit will turn on
  //   -Xshare:on
  //   -XX:+TraceClassPaths
  if (PrintSharedArchiveAndExit) {
    FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
    FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
    FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
  }

3400 3401
  // Change the default value for flags  which have different default values
  // when working with older JDKs.
3402 3403 3404 3405 3406 3407
#ifdef LINUX
 if (JDK_Version::current().compare_major(6) <= 0 &&
      FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
    FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
  }
#endif // LINUX
3408
  fix_appclasspath();
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  return JNI_OK;
}

3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452
// Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
//
// This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
// in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
// Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
// path is treated as the current directory.
//
// This causes problems with CDS, which requires that all directories specified in the classpath
// must be empty. In most cases, applications do NOT want to load classes from the current
// directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
// scripts compatible with CDS.
void Arguments::fix_appclasspath() {
  if (IgnoreEmptyClassPaths) {
    const char separator = *os::path_separator();
    const char* src = _java_class_path->value();

    // skip over all the leading empty paths
    while (*src == separator) {
      src ++;
    }

    char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
    strncpy(copy, src, strlen(src) + 1);

    // trim all trailing empty paths
    for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
      *tail = '\0';
    }

    char from[3] = {separator, separator, '\0'};
    char to  [2] = {separator, '\0'};
    while (StringUtils::replace_no_expand(copy, from, to) > 0) {
      // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
      // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
    }

    _java_class_path->set_value(copy);
    FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
  }

  if (!PrintSharedArchiveAndExit) {
3453
    ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
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 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 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587
static bool has_jar_files(const char* directory) {
  DIR* dir = os::opendir(directory);
  if (dir == NULL) return false;

  struct dirent *entry;
  char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
  bool hasJarFile = false;
  while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
    const char* name = entry->d_name;
    const char* ext = name + strlen(name) - 4;
    hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
  }
  FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
  os::closedir(dir);
  return hasJarFile ;
}

// returns the number of directories in the given path containing JAR files
// If the skip argument is not NULL, it will skip that directory
static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
  const char separator = *os::path_separator();
  const char* const end = path + strlen(path);
  int nonEmptyDirs = 0;
  while (path < end) {
    const char* tmp_end = strchr(path, separator);
    if (tmp_end == NULL) {
      if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
        nonEmptyDirs++;
        jio_fprintf(defaultStream::output_stream(),
          "Non-empty %s directory: %s\n", type, path);
      }
      path = end;
    } else {
      char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
      memcpy(dirpath, path, tmp_end - path);
      dirpath[tmp_end - path] = '\0';
      if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
        nonEmptyDirs++;
        jio_fprintf(defaultStream::output_stream(),
          "Non-empty %s directory: %s\n", type, dirpath);
      }
      FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
      path = tmp_end + 1;
    }
  }
  return nonEmptyDirs;
}

// Returns true if endorsed standards override mechanism and extension mechanism
// are not used.
static bool check_endorsed_and_ext_dirs() {
  if (!CheckEndorsedAndExtDirs)
    return true;

  char endorsedDir[JVM_MAXPATHLEN];
  char extDir[JVM_MAXPATHLEN];
  const char* fileSep = os::file_separator();
  jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
               Arguments::get_java_home(), fileSep, fileSep);
  jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
               Arguments::get_java_home(), fileSep, fileSep);

  // check endorsed directory
  int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);

  // check the extension directories but skip the default lib/ext directory
  nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);

  // List of JAR files installed in the default lib/ext directory.
  // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
  static const char* jdk_ext_jars[] = {
      "access-bridge-32.jar",
      "access-bridge-64.jar",
      "access-bridge.jar",
      "cldrdata.jar",
      "dnsns.jar",
      "jaccess.jar",
      "jfxrt.jar",
      "localedata.jar",
      "nashorn.jar",
      "sunec.jar",
      "sunjce_provider.jar",
      "sunmscapi.jar",
      "sunpkcs11.jar",
      "ucrypto.jar",
      "zipfs.jar",
      NULL
  };

  // check if the default lib/ext directory has any non-JDK jar files; if so, error
  DIR* dir = os::opendir(extDir);
  if (dir != NULL) {
    int num_ext_jars = 0;
    struct dirent *entry;
    char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(extDir), mtInternal);
    while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
      const char* name = entry->d_name;
      const char* ext = name + strlen(name) - 4;
      if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
        bool is_jdk_jar = false;
        const char* jarfile = NULL;
        for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
          if (os::file_name_strcmp(name, jarfile) == 0) {
            is_jdk_jar = true;
            break;
          }
        }
        if (!is_jdk_jar) {
          jio_fprintf(defaultStream::output_stream(),
            "%s installed in <JAVA_HOME>/lib/ext\n", name);
          num_ext_jars++;
        }
      }
    }
    FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
    os::closedir(dir);
    if (num_ext_jars > 0) {
      nonEmptyDirs += 1;
    }
  }

  // check if the default lib/endorsed directory exists; if so, error
  dir = os::opendir(endorsedDir);
  if (dir != NULL) {
    jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
    os::closedir(dir);
    nonEmptyDirs += 1;
  }

  if (nonEmptyDirs > 0) {
    jio_fprintf(defaultStream::output_stream(),
3588
      "Endorsed standards override mechanism and extension mechanism "
3589 3590 3591 3592 3593 3594 3595 3596
      "will not be supported in a future release.\n"
      "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
    return false;
  }

  return true;
}

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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());
  }

3606 3607 3608 3609
  if (!check_endorsed_and_ext_dirs()) {
    return JNI_ERR;
  }

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3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621
  // 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);
  }

3622 3623 3624 3625 3626
  // 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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3627 3628 3629 3630 3631 3632 3633 3634 3635
#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);
  }
3636

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3637 3638 3639 3640 3641 3642
#else
  if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
    FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
  }
#endif

3643 3644 3645 3646 3647
#ifndef TIERED
  // Tiered compilation is undefined.
  UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
#endif

3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660
  // 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];
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3661
        jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer);
3662 3663 3664 3665 3666 3667 3668
        if (!add_property(buffer)) {
          return JNI_ENOMEM;
        }
      }
    }
  }

3669
  if (!check_vm_args_consistency()) {
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3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740
    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;
3741
    vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
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3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752

    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);
        }
      }
    }

3753
    return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
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3754 3755 3756 3757
  }
  return JNI_OK;
}

3758
void Arguments::set_shared_spaces_flags() {
3759
  if (DumpSharedSpaces) {
J
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3760 3761 3762 3763 3764 3765 3766 3767
    if (FailOverToOldVerifier) {
      // Don't fall back to the old verifier on verification failure. If a
      // class fails verification with the split verifier, it might fail the
      // CDS runtime verifier constraint check. In that case, we don't want
      // to share the class. We only archive classes that pass the split verifier.
      FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
    }

3768 3769 3770 3771
    if (RequireSharedSpaces) {
      warning("cannot dump shared archive while using shared archive");
    }
    UseSharedSpaces = false;
3772
#ifdef _LP64
3773
    if (!UseCompressedOops || !UseCompressedClassPointers) {
3774
      vm_exit_during_initialization(
3775
        "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3776 3777
    }
  } else {
3778
    if (!UseCompressedOops || !UseCompressedClassPointers) {
3779
      no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3780 3781
    }
#endif
3782
  }
3783
}
3784

3785
#if !INCLUDE_ALL_GCS
3786 3787 3788 3789 3790 3791 3792 3793 3794
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);
}
3795
#endif // INCLUDE_ALL_GCS
3796

3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823
// 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;
}

3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850
#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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// 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.
3859
  const char* hotspotrc = ".hotspotrc";
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3860
  bool settings_file_specified = false;
3861 3862
  bool needs_hotspotrc_warning = false;

3863 3864
  ArgumentsExt::process_options(args);

3865
  const char* flags_file;
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  int index;
  for (index = 0; index < args->nOptions; index++) {
    const JavaVMOption *option = args->options + index;
    if (match_option(option, "-XX:Flags=", &tail)) {
3870
      flags_file = tail;
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      settings_file_specified = true;
    }
    if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
      PrintVMOptions = true;
    }
3876 3877 3878
    if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
      PrintVMOptions = false;
    }
3879 3880 3881 3882 3883 3884
    if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
      IgnoreUnrecognizedVMOptions = true;
    }
    if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
      IgnoreUnrecognizedVMOptions = false;
    }
3885
    if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
F
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3886
      CommandLineFlags::printFlags(tty, false);
3887 3888
      vm_exit(0);
    }
3889
    if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3890
#if INCLUDE_NMT
3891
      // The launcher did not setup nmt environment variable properly.
3892 3893 3894
      if (!MemTracker::check_launcher_nmt_support(tail)) {
        warning("Native Memory Tracking did not setup properly, using wrong launcher?");
      }
3895 3896 3897 3898 3899 3900 3901 3902 3903 3904

      // 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);
      }
3905 3906 3907 3908
#else
      jio_fprintf(defaultStream::error_stream(),
        "Native Memory Tracking is not supported in this VM\n");
      return JNI_ERR;
3909
#endif
3910
    }
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3912 3913 3914

#ifndef PRODUCT
    if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
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3915
      CommandLineFlags::printFlags(tty, true);
3916 3917 3918
      vm_exit(0);
    }
#endif
3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930
  }

  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;
    }
3931
  } else {
3932
#ifdef ASSERT
3933
    // Parse default .hotspotrc settings file
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    if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
      return JNI_EINVAL;
    }
3937 3938 3939 3940 3941
#else
    struct stat buf;
    if (os::stat(hotspotrc, &buf) == 0) {
      needs_hotspotrc_warning = true;
    }
3942
#endif
3943
  }
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  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;
  }

3960 3961 3962 3963 3964 3965
  // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
  SharedArchivePath = get_shared_archive_path();
  if (SharedArchivePath == NULL) {
    return JNI_ENOMEM;
  }

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  // Set up VerifySharedSpaces
  if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
    VerifySharedSpaces = true;
  }

3971 3972 3973 3974 3975 3976 3977 3978
  // 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);
  }

3979 3980 3981 3982
#ifdef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
  UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
#endif

3983 3984 3985 3986 3987
#if INCLUDE_ALL_GCS
  #if (defined JAVASE_EMBEDDED || defined ARM)
    UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
  #endif
#endif
3988

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#ifndef PRODUCT
  if (TraceBytecodesAt != 0) {
    TraceBytecodes = true;
  }
  if (CountCompiledCalls) {
    if (UseCounterDecay) {
      warning("UseCounterDecay disabled because CountCalls is set");
      UseCounterDecay = false;
    }
  }
#endif // PRODUCT

4001 4002 4003 4004 4005 4006 4007
  // 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;
4008 4009
    }
  }
4010 4011

  if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
4012
    if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4013
      warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
4014 4015 4016
    }
    ScavengeRootsInCode = 1;
  }
4017

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

4023 4024 4025 4026 4027 4028 4029 4030
  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);
    }
  }

4031 4032 4033
  // Set object alignment values.
  set_object_alignment();

4034
#if !INCLUDE_ALL_GCS
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  force_serial_gc();
4036
#endif // INCLUDE_ALL_GCS
4037
#if !INCLUDE_CDS
4038 4039 4040 4041 4042
  if (DumpSharedSpaces || RequireSharedSpaces) {
    jio_fprintf(defaultStream::error_stream(),
      "Shared spaces are not supported in this VM\n");
    return JNI_ERR;
  }
4043
  if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4044 4045 4046 4047
    warning("Shared spaces are not supported in this VM");
    FLAG_SET_DEFAULT(UseSharedSpaces, false);
    FLAG_SET_DEFAULT(PrintSharedSpaces, false);
  }
4048
  no_shared_spaces("CDS Disabled");
4049
#endif // INCLUDE_CDS
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4051 4052 4053 4054 4055
  return JNI_OK;
}

jint Arguments::apply_ergo() {

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  // Set flags based on ergonomics.
  set_ergonomics_flags();

4059
  set_shared_spaces_flags();
4060

4061
  // Check the GC selections again.
4062
  if (!check_gc_consistency()) {
4063 4064 4065
    return JNI_EINVAL;
  }

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  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);
    }
  }
4075 4076 4077 4078 4079
  // 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));
  }

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4081 4082
  // Set heap size based on available physical memory
  set_heap_size();
4083

4084
  ArgumentsExt::set_gc_specific_flags();
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4086 4087 4088
  // Initialize Metaspace flags and alignments.
  Metaspace::ergo_initialize();

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  // Set bytecode rewriting flags
  set_bytecode_flags();

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

4095 4096 4097
  // Turn off biased locking for locking debug mode flags,
  // which are subtlely different from each other but neither works with
  // biased locking.
4098 4099 4100 4101 4102
  if (UseHeavyMonitors
#ifdef COMPILER1
      || !UseFastLocking
#endif // COMPILER1
    ) {
4103 4104 4105 4106 4107 4108 4109 4110 4111
    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;
  }

4112 4113
#ifdef ZERO
  // Clear flags not supported on zero.
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  FLAG_SET_DEFAULT(ProfileInterpreter, false);
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  FLAG_SET_DEFAULT(UseBiasedLocking, false);
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  LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4117
  LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
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#endif // CC_INTERP

4120
#ifdef COMPILER2
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  if (!EliminateLocks) {
    EliminateNestedLocks = false;
  }
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  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);
  }
4136 4137 4138 4139
  if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
    // nothing to use the profiling, turn if off
    FLAG_SET_DEFAULT(TypeProfileLevel, 0);
  }
4140 4141
#endif

4142 4143 4144 4145 4146
  if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
    warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
    DebugNonSafepoints = true;
  }

4147 4148 4149 4150
  if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
    warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
  }

4151 4152 4153 4154 4155 4156 4157
#ifndef PRODUCT
  if (CompileTheWorld) {
    // Force NmethodSweeper to sweep whole CodeCache each time.
    if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
      NmethodSweepFraction = 1;
    }
  }
4158 4159 4160 4161 4162 4163 4164

  if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
    if (use_vm_log()) {
      LogVMOutput = true;
    }
  }
#endif // PRODUCT
4165

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  if (PrintCommandLineFlags) {
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    CommandLineFlags::printSetFlags(tty);
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  }

4170 4171 4172 4173 4174 4175 4176
  // Apply CPU specific policy for the BiasedLocking
  if (UseBiasedLocking) {
    if (!VM_Version::use_biased_locking() &&
        !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
      UseBiasedLocking = false;
    }
  }
4177 4178 4179 4180 4181
#ifdef COMPILER2
  if (!UseBiasedLocking || EmitSync != 0) {
    UseOptoBiasInlining = false;
  }
#endif
4182

4183 4184 4185 4186 4187 4188 4189 4190 4191 4192
  // 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);
    }
  }

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  return JNI_OK;
}

4196
jint Arguments::adjust_after_os() {
4197 4198
  if (UseNUMA) {
    if (UseParallelGC || UseParallelOldGC) {
4199
      if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4200
         FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4201
      }
4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212
    }
    // 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);
4213 4214 4215 4216 4217
    }
  }
  return JNI_OK;
}

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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.
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void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
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  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) {
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      if (append) {
        prop->append_value(v);
      } else {
        prop->set_value(v);
      }
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      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
}