arguments.cpp 131.1 KB
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/*
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 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
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 *
 */

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#include "precompiled.hpp"
#include "classfile/javaAssertions.hpp"
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#include "classfile/symbolTable.hpp"
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#include "compiler/compilerOracle.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/cardTableRS.hpp"
#include "memory/referenceProcessor.hpp"
#include "memory/universe.inline.hpp"
#include "oops/oop.inline.hpp"
#include "prims/jvmtiExport.hpp"
#include "runtime/arguments.hpp"
#include "runtime/globals_extension.hpp"
#include "runtime/java.hpp"
#include "services/management.hpp"
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#include "services/memTracker.hpp"
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#include "utilities/defaultStream.hpp"
#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_bsd
# include "os_bsd.inline.hpp"
#endif
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#ifndef SERIALGC
#include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
#endif
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// Note: This is a special bug reporting site for the JVM
#define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
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#define DEFAULT_JAVA_LAUNCHER  "generic"

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;
bool   Arguments::_has_alloc_profile            = false;
uintx  Arguments::_min_heap_size                = 0;
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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#ifdef PRODUCT
  { "DesiredMethodLimit",
                           JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
#endif // PRODUCT
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  { NULL, JDK_Version(0), JDK_Version(0) }
};

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

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

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

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

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

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

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

  inline void reset_item_at(int index);

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  size_t lengths[_scp_nitems];
  size_t total_len = 0;

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

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

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

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

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

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

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

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

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

// Parses a memory size specification string.
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static bool atomull(const char *s, julong* result) {
  julong n = 0;
  int args_read = sscanf(s, os::julong_format_specifier(), &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();
  }
}

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

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

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

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

static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
  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;
}

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

bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {

  // 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;
  }

  int index = *count;

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

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

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

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

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

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

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]);
    }
    st->print_cr("");
  }
}

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bool Arguments::process_argument(const char* arg,
    jboolean ignore_unrecognized, FlagValueOrigin origin) {

  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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  const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
  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.

  Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true);
  if (locked_flag != NULL) {
    char locked_message_buf[BUFLEN];
    locked_flag->get_locked_message(locked_message_buf, BUFLEN);
    if (strlen(locked_message_buf) == 0) {
      jio_fprintf(defaultStream::error_stream(),
        "Unrecognized VM option '%s'\n", argname);
    } 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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  }

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  // 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);
        result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
        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';
    result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
    build_jvm_flags(token);
  }
  fclose(stream);
  return result;
}

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

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

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

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

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

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

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

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

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

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

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#ifndef ZERO
  // Turn these off for mixed and comp.  Leave them on for Zero.
  if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
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    UseFastAccessorMethods = (mode == _int);
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  }
  if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
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    UseFastEmptyMethods = (mode == _int);
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  }
#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;
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    // 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;
  }
}

// Conflict: required to use shared spaces (-Xshare:on), but
// incompatible command line options were chosen.

static void no_shared_spaces() {
  if (RequireSharedSpaces) {
    jio_fprintf(defaultStream::error_stream(),
      "Class data sharing is inconsistent with other specified options.\n");
    vm_exit_during_initialization("Unable to use shared archive.", NULL);
  } else {
    FLAG_SET_DEFAULT(UseSharedSpaces, false);
  }
}

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void Arguments::set_tiered_flags() {
1061
  // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
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  if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1063
    FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
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1064 1065 1066 1067 1068
  }
  if (CompilationPolicyChoice < 2) {
    vm_exit_during_initialization(
      "Incompatible compilation policy selected", NULL);
  }
1069
  // Increase the code cache size - tiered compiles a lot more.
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  if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
    FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
  }
}

1075
#if INCLUDE_ALTERNATE_GCS
1076 1077 1078 1079 1080 1081 1082 1083 1084 1085
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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// If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
// if it's not explictly set or unset. If the user has chosen
// UseParNewGC and not explicitly set ParallelGCThreads we
// set it, unless this is a single cpu machine.
void Arguments::set_parnew_gc_flags() {
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  assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1092 1093
         "control point invariant");
  assert(UseParNewGC, "Error");
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1095 1096
  // Turn off AdaptiveSizePolicy for parnew until it is complete.
  disable_adaptive_size_policy("UseParNewGC");
1097

1098
  if (ParallelGCThreads == 0) {
1099 1100
    FLAG_SET_DEFAULT(ParallelGCThreads,
                     Abstract_VM_Version::parallel_worker_threads());
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    if (ParallelGCThreads == 1) {
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      FLAG_SET_DEFAULT(UseParNewGC, false);
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      FLAG_SET_DEFAULT(ParallelGCThreads, 0);
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    }
  }
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  if (UseParNewGC) {
1107
    // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
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    // 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);
    }

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    // AlwaysTenure flag should make ParNew promote all at first collection.
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    // See CR 6362902.
    if (AlwaysTenure) {
1121
      FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
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    }
1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
    // 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");
      }
      FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
    }
    assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
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  }
}

// Adjust some sizes to suit CMS and/or ParNew needs; these work well on
// sparc/solaris for certain applications, but would gain from
// further optimization and tuning efforts, and would almost
// certainly gain from analysis of platform and environment.
void Arguments::set_cms_and_parnew_gc_flags() {
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  assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1142 1143
  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.
1146
  if (FLAG_IS_DEFAULT(UseParNewGC)) {
1147
    FLAG_SET_ERGO(bool, UseParNewGC, true);
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  }

1150
  // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1151
  disable_adaptive_size_policy("UseConcMarkSweepGC");
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  // In either case, adjust ParallelGCThreads and/or UseParNewGC
  // as needed.
1155 1156
  if (UseParNewGC) {
    set_parnew_gc_flags();
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  }

1159 1160 1161 1162
  // MaxHeapSize is aligned down in collectorPolicy
  size_t max_heap = align_size_down(MaxHeapSize,
                                    CardTableRS::ct_max_alignment_constraint());

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  // Now make adjustments for CMS
1164 1165 1166 1167 1168
  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 =
1172 1173
    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
1177
  // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1178 1179 1180 1181 1182 1183 1184 1185

  // 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
1187
      FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
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    } else {
1189
      FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
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    }
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    if (PrintGCDetails && Verbose) {
1192
      // Too early to use gclog_or_tty
1193
      tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1194 1195 1196 1197
    }

    // Code along this path potentially sets NewSize and OldSize

1198 1199
    assert(max_heap >= InitialHeapSize, "Error");
    assert(max_heap >= NewSize, "Error");
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    if (PrintGCDetails && Verbose) {
1202 1203 1204 1205
      // 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);
1207
    }
1208 1209 1210 1211 1212
    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)) {
1216 1217
        FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
        FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
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        if (PrintGCDetails && Verbose) {
1219
          // Too early to use gclog_or_tty
1220
          tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1221
        }
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1222 1223
      }
      // Unless explicitly requested otherwise, size old gen
1224
      // so it's NewRatio x of NewSize.
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      if (FLAG_IS_DEFAULT(OldSize)) {
        if (max_heap > NewSize) {
1227
          FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
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          if (PrintGCDetails && Verbose) {
1229
            // Too early to use gclog_or_tty
1230
            tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1231
          }
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        }
      }
    }
  }
  // Unless explicitly requested otherwise, definitely
  // promote all objects surviving "tenuring_default" scavenges.
  if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
      FLAG_IS_DEFAULT(SurvivorRatio)) {
1240
    FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
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  }
  // If we decided above (or user explicitly requested)
  // `promote all' (via MaxTenuringThreshold := 0),
  // prefer minuscule survivor spaces so as not to waste
  // space for (non-existent) survivors
  if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1247
    FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)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)) {
1256 1257 1258 1259 1260
      // 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);
1261
    } else {
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      // 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(),
1266 1267 1268
                  "Both OldPLABSize and CMSParPromoteBlocksToClaim"
                  " options are specified for the CMS collector."
                  " CMSParPromoteBlocksToClaim will take precedence.\n");
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    }
  }
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285
  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);
  }
1286 1287 1288 1289 1290
  if (PrintGCDetails && Verbose) {
    tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
      MarkStackSize / K, MarkStackSizeMax / K);
    tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
  }
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}
1292
#endif // INCLUDE_ALTERNATE_GCS
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1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308
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;

1309
#if INCLUDE_ALTERNATE_GCS
1310 1311
  // Set CMS global values
  CompactibleFreeListSpace::set_cms_values();
1312
#endif // INCLUDE_ALTERNATE_GCS
1313 1314 1315 1316 1317 1318
}

bool verify_object_alignment() {
  // Object alignment.
  if (!is_power_of_2(ObjectAlignmentInBytes)) {
    jio_fprintf(defaultStream::error_stream(),
1319 1320
                "error: ObjectAlignmentInBytes=%d must be power of 2\n",
                (int)ObjectAlignmentInBytes);
1321 1322 1323 1324
    return false;
  }
  if ((int)ObjectAlignmentInBytes < BytesPerLong) {
    jio_fprintf(defaultStream::error_stream(),
1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342
                "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(),
                "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
                (int)ObjectAlignmentInBytes);
    return false;
  }
  // In case page size is very small.
  if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
    jio_fprintf(defaultStream::error_stream(),
                "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
                (int)ObjectAlignmentInBytes, os::vm_page_size());
1343 1344 1345 1346 1347
    return false;
  }
  return true;
}

1348
inline uintx max_heap_for_compressed_oops() {
1349
  // Avoid sign flip.
1350
  if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1351 1352
    return 0;
  }
1353
  LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
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  NOT_LP64(ShouldNotReachHere(); return 0);
1355 1356
}

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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"
       " based on pause goal of %d (ms)", MaxGCPauseMillis);
    }
    return true;
  }
  return false;
}

void Arguments::set_ergonomics_flags() {

1373
  if (os::is_server_class_machine()) {
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    // If no other collector is requested explicitly,
    // let the VM select the collector based on
    // machine class and automatic selection policy.
    if (!UseSerialGC &&
        !UseConcMarkSweepGC &&
1379
        !UseG1GC &&
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        !UseParNewGC &&
        FLAG_IS_DEFAULT(UseParallelGC)) {
      if (should_auto_select_low_pause_collector()) {
        FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
      } else {
        FLAG_SET_ERGO(bool, UseParallelGC, true);
      }
1387 1388 1389 1390 1391 1392 1393
    }
    // Shared spaces work fine with other GCs but causes bytecode rewriting
    // to be disabled, which hurts interpreter performance and decreases
    // server performance.   On server class machines, 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) {
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      no_shared_spaces();
    }
  }
1397

1398
#ifndef ZERO
1399 1400 1401
#ifdef _LP64
  // Check that UseCompressedOops can be set with the max heap size allocated
  // by ergonomics.
1402
  if (MaxHeapSize <= max_heap_for_compressed_oops()) {
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#if !defined(COMPILER1) || defined(TIERED)
1404
    if (FLAG_IS_DEFAULT(UseCompressedOops)) {
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      FLAG_SET_ERGO(bool, UseCompressedOops, true);
1406
    }
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#endif
1408 1409 1410 1411
#ifdef _WIN64
    if (UseLargePages && UseCompressedOops) {
      // Cannot allocate guard pages for implicit checks in indexed addressing
      // mode, when large pages are specified on windows.
1412 1413 1414
      // 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);
1415 1416
    }
#endif //  _WIN64
1417 1418
  } else {
    if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
Y
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      warning("Max heap size too large for Compressed Oops");
1420
      FLAG_SET_DEFAULT(UseCompressedOops, false);
1421
      FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1422 1423
    }
  }
1424 1425 1426 1427 1428 1429 1430 1431
  // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
  if (!UseCompressedOops) {
    if (UseCompressedKlassPointers) {
      warning("UseCompressedKlassPointers requires UseCompressedOops");
    }
    FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
  } else {
    // Turn on UseCompressedKlassPointers too
1432 1433 1434
    if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
      FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
    }
1435 1436 1437 1438 1439 1440 1441 1442 1443
    // Set the ClassMetaspaceSize to something that will not need to be
    // expanded, since it cannot be expanded.
    if (UseCompressedKlassPointers && FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
      // 100,000 classes seems like a good size, so 100M assumes around 1K
      // per klass.   The vtable and oopMap is embedded so we don't have a fixed
      // size per klass.   Eventually, this will be parameterized because it
      // would also be useful to determine the optimal size of the
      // systemDictionary.
      FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1444 1445 1446 1447 1448
    }
  }
  // Also checks that certain machines are slower with compressed oops
  // in vm_version initialization code.
#endif // _LP64
1449
#endif // !ZERO
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}

void Arguments::set_parallel_gc_flags() {
1453
  assert(UseParallelGC || UseParallelOldGC, "Error");
1454 1455 1456
  // 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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1457
  }
1458
  FLAG_SET_DEFAULT(UseParallelGC, true);
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1459 1460 1461 1462

  // If no heap maximum was requested explicitly, use some reasonable fraction
  // of the physical memory, up to a maximum of 1GB.
  if (UseParallelGC) {
1463 1464
    FLAG_SET_DEFAULT(ParallelGCThreads,
                     Abstract_VM_Version::parallel_worker_threads());
1465

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

    if (UseParallelOldGC) {
      // Par compact uses lower default values since they are treated as
1481 1482
      // minimums.  These are different defaults because of the different
      // interpretation and are not ergonomically set.
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      if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1484
        FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
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1485 1486 1487 1488 1489
      }
    }
  }
}

1490 1491 1492 1493 1494 1495 1496 1497 1498
void Arguments::set_g1_gc_flags() {
  assert(UseG1GC, "Error");
#ifdef COMPILER1
  FastTLABRefill = false;
#endif
  FLAG_SET_DEFAULT(ParallelGCThreads,
                     Abstract_VM_Version::parallel_worker_threads());
  if (ParallelGCThreads == 0) {
    FLAG_SET_DEFAULT(ParallelGCThreads,
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                     Abstract_VM_Version::parallel_worker_threads());
1500
  }
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1502 1503 1504 1505 1506 1507
  // 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);
1508
  }
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1509 1510 1511 1512 1513 1514 1515 1516 1517 1518

  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);
  }
1519 1520 1521 1522 1523 1524

  if (PrintGCDetails && Verbose) {
    tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
      MarkStackSize / K, MarkStackSizeMax / K);
    tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
  }
1525 1526
}

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

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

  // If the maximum heap size has not been set with -Xmx,
  // then set it as fraction of the size of physical memory,
  // respecting the maximum and minimum sizes of the heap.
1540
  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
1557 1558 1559 1560 1561 1562 1563
      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);
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    }
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    reasonable_max = os::allocatable_physical_memory(reasonable_max);

    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
      // after call to allocatable_physical_memory because that
      // method might reduce the allocation size.
      reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
    }

1575 1576
    if (PrintGCDetails && Verbose) {
      // Cannot use gclog_or_tty yet.
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      tty->print_cr("  Maximum heap size " SIZE_FORMAT, reasonable_max);
1578
    }
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    FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
  }

  // If the initial_heap_size has not been set with InitialHeapSize
  // or -Xms, then set it as fraction of the size of physical memory,
  // respecting the maximum and minimum sizes of the heap.
  if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1586 1587 1588 1589 1590 1591
    julong reasonable_minimum = (julong)(OldSize + NewSize);

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

    reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);

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    julong reasonable_initial = phys_mem / InitialRAMFraction;

1594
    reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
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    reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);

    reasonable_initial = os::allocatable_physical_memory(reasonable_initial);

    if (PrintGCDetails && Verbose) {
      // Cannot use gclog_or_tty yet.
      tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1602
      tty->print_cr("  Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
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    }
    FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1605
    set_min_heap_size((uintx)reasonable_minimum);
1606 1607 1608
  }
}

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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() {
1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635
#ifdef COMPILER2
  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];
1636
    sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1637 1638
    add_property(buffer);
  }
1639 1640 1641
  if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
    FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
  }
1642 1643
#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);
1666 1667 1668
  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;
}

1676 1677 1678 1679
bool Arguments::created_by_gamma_launcher() {
  return _created_by_gamma_launcher;
}

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

1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696
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;
}

1697
bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1698
  // Returns true if given value is at least specified min threshold
1699 1700 1701 1702 1703
  // false, otherwise.
  if (val >= min ) {
      return true;
  }
  jio_fprintf(defaultStream::error_stream(),
1704
              "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1705 1706 1707 1708
              name, val, min);
  return false;
}

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

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static void force_serial_gc() {
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  FLAG_SET_DEFAULT(UseSerialGC, true);
  FLAG_SET_DEFAULT(UseParNewGC, false);
  FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1723
  FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
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  FLAG_SET_DEFAULT(UseParallelGC, false);
  FLAG_SET_DEFAULT(UseParallelOldGC, false);
1726
  FLAG_SET_DEFAULT(UseG1GC, false);
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}

static bool verify_serial_gc_flags() {
  return (UseSerialGC &&
1731
        !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1732
          UseParallelGC || UseParallelOldGC));
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}

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// check if do gclog rotation
// +UseGCLogFileRotation is a must,
// no gc log rotation when log file not supplied or
// NumberOfGCLogFiles is 0, or GCLogFileSize is 0
void check_gclog_consistency() {
  if (UseGCLogFileRotation) {
    if ((Arguments::gc_log_filename() == NULL) ||
        (NumberOfGCLogFiles == 0)  ||
        (GCLogFileSize == 0)) {
      jio_fprintf(defaultStream::output_stream(),
1745
                  "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758
                  "where num_of_file > 0 and num_of_size > 0\n"
                  "GC log rotation is turned off\n");
      UseGCLogFileRotation = false;
    }
  }

  if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
        FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
        jio_fprintf(defaultStream::output_stream(),
                    "GCLogFileSize changed to minimum 8K\n");
  }
}

1759 1760
// Check consistency of GC selection
bool Arguments::check_gc_consistency() {
1761
  check_gclog_consistency();
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  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++;
1774
  if (UseG1GC)                           i++;
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  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;
}

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// 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");
1792 1793
  // greater stack shadow pages can't generate instruction to bang stack
  status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
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  return status;
}

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

#if ( (defined(COMPILER2) && defined(SPARC)))
  // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
  // on sparc doesn't require generation of a stub as is the case on, e.g.,
  // x86.  Normally, VM_Version_init must be called from init_globals in
  // init.cpp, which is called by the initial java thread *after* arguments
  // have been parsed.  VM_Version_init gets called twice on sparc.
  extern void VM_Version_init();
  VM_Version_init();
  if (!VM_Version::has_v9()) {
    jio_fprintf(defaultStream::error_stream(),
                "V8 Machine detected, Server requires V9\n");
    status = false;
  }
#endif /* COMPILER2 && SPARC */

  // 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;
  }

1839
  status = status && verify_percentage(AdaptiveSizePolicyWeight,
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                              "AdaptiveSizePolicyWeight");
1841 1842 1843
  status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
  status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
  status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
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1845 1846 1847 1848 1849
  // 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.
  status = status && verify_interval(StringTableSize, defaultStringTableSize,
    (max_uintx / StringTable::bucket_size()), "StringTable size");

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  if (MinHeapFreeRatio > MaxHeapFreeRatio) {
    jio_fprintf(defaultStream::error_stream(),
                "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
                "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
                MinHeapFreeRatio, MaxHeapFreeRatio);
    status = false;
  }
  // Keeping the heap 100% free is hard ;-) so limit it to 99%.
  MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);

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

1864 1865 1866 1867 1868 1869 1870 1871 1872 1873
  if (UseParallelOldGC && ParallelOldGCSplitALot) {
    // Settings to encourage splitting.
    if (!FLAG_IS_CMDLINE(NewRatio)) {
      FLAG_SET_CMDLINE(intx, NewRatio, 2);
    }
    if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
      FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
    }
  }

1874 1875
  status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
  status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
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  if (GCTimeLimit == 100) {
    // Turn off gc-overhead-limit-exceeded checks
    FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
  }

1881
  status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
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1883
  status = status && check_gc_consistency();
1884
  status = status && check_stack_pages();
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  if (_has_alloc_profile) {
    if (UseParallelGC || UseParallelOldGC) {
      jio_fprintf(defaultStream::error_stream(),
                  "error:  invalid argument combination.\n"
                  "Allocation profiling (-Xaprof) cannot be used together with "
                  "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
      status = false;
    }
    if (UseConcMarkSweepGC) {
      jio_fprintf(defaultStream::error_stream(),
                  "error:  invalid argument combination.\n"
                  "Allocation profiling (-Xaprof) cannot be used together with "
                  "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
      status = false;
    }
  }

  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 {
1911
      status = status && verify_percentage(CMSIncrementalDutyCycle,
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                                  "CMSIncrementalDutyCycle");
1913
      status = status && verify_percentage(CMSIncrementalDutyCycleMin,
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                                  "CMSIncrementalDutyCycleMin");
1915
      status = status && verify_percentage(CMSIncrementalSafetyFactor,
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                                  "CMSIncrementalSafetyFactor");
1917
      status = status && verify_percentage(CMSIncrementalOffset,
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                                  "CMSIncrementalOffset");
1919
      status = status && verify_percentage(CMSExpAvgFactor,
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                                  "CMSExpAvgFactor");
      // If it was not set on the command line, set
      // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
      if (CMSInitiatingOccupancyFraction < 0) {
        FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
      }
    }
  }

  // CMS space iteration, which FLSVerifyAllHeapreferences entails,
  // insists that we hold the requisite locks so that the iteration is
  // MT-safe. For the verification at start-up and shut-down, we don't
  // yet have a good way of acquiring and releasing these locks,
  // which are not visible at the CollectedHeap level. We want to
  // be able to acquire these locks and then do the iteration rather
  // than just disable the lock verification. This will be fixed under
  // bug 4788986.
  if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
    if (VerifyGCStartAt == 0) {
      warning("Heap verification at start-up disabled "
              "(due to current incompatibility with FLSVerifyAllHeapReferences)");
      VerifyGCStartAt = 1;      // Disable verification at start-up
    }
    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(),
1955
                "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
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                " with -UseAsyncConcMarkSweepGC");
    status = false;
  }

1960 1961
  status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");

1962
#ifndef SERIALGC
1963 1964 1965
  if (UseG1GC) {
    status = status && verify_percentage(InitiatingHeapOccupancyPercent,
                                         "InitiatingHeapOccupancyPercent");
1966 1967 1968 1969
    status = status && verify_min_value(G1RefProcDrainInterval, 1,
                                        "G1RefProcDrainInterval");
    status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
                                        "G1ConcMarkStepDurationMillis");
1970
  }
1971
#endif
1972

1973 1974 1975 1976 1977 1978 1979 1980 1981 1982
  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");

1983 1984
  status = status && verify_object_alignment();

1985 1986 1987
  status = status && verify_min_value(ClassMetaspaceSize, 1*M,
                                      "ClassMetaspaceSize");

1988 1989 1990
  status = status && verify_interval(MarkStackSizeMax,
                                  1, (max_jint - 1), "MarkStackSizeMax");

1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
#ifdef SPARC
  if (UseConcMarkSweepGC || UseG1GC) {
    // Issue a stern warning if the user has explicitly set
    // UseMemSetInBOT (it is known to cause issues), but allow
    // use for experimentation and debugging.
    if (VM_Version::is_sun4v() && UseMemSetInBOT) {
      assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
      warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
          " on sun4v; please understand that you are using at your own risk!");
    }
  }
#endif // SPARC

2004 2005 2006 2007 2008 2009 2010 2011 2012
  if (PrintNMTStatistics) {
#if INCLUDE_NMT
    if (MemTracker::tracking_level() == MemTracker::NMT_off) {
#endif // INCLUDE_NMT
      warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
      PrintNMTStatistics = false;
#if INCLUDE_NMT
    }
#endif
2013 2014
  }

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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;
}

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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,
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                                                  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;

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  // 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
  result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
  if (result != JNI_OK) {
    return result;
  }

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  if (AggressiveOpts) {
    // Insert alt-rt.jar between user-specified bootclasspath
    // prefix and the default bootclasspath.  os::set_boot_path()
    // uses meta_index_dir as the default bootclasspath directory.
    const char* altclasses_jar = "alt-rt.jar";
    size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
                                 strlen(altclasses_jar);
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    char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
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    strcpy(altclasses_path, get_meta_index_dir());
    strcat(altclasses_path, altclasses_jar);
    scp.add_suffix_to_prefix(altclasses_path);
    scp_assembly_required = true;
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    FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
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  }

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  if (WhiteBoxAPI) {
    // Append wb.jar to bootclasspath if enabled
    const char* wb_jar = "wb.jar";
    size_t wb_path_len = strlen(get_meta_index_dir()) + 1 +
                         strlen(wb_jar);
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    char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal);
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    strcpy(wb_path, get_meta_index_dir());
    strcat(wb_path, wb_jar);
    scp.add_suffix(wb_path);
    scp_assembly_required = true;
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    FREE_C_HEAP_ARRAY(char, wb_path, mtInternal);
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  }

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  // 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;
}

jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
                                       SysClassPath* scp_p,
                                       bool* scp_assembly_required_p,
                                       FlagValueOrigin origin) {
  // 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)) {
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      if (tail != NULL) {
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        const char* pos = strchr(tail, ':');
        size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
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        char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
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        name[len] = '\0';

        char *options = NULL;
        if(pos != NULL) {
          size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
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          options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
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        }
2239
#if !INCLUDE_JVMTI
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        if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
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          warning("profiling and debugging agents are not supported in this VM");
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        } else
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#endif // !INCLUDE_JVMTI
          add_init_library(name, options);
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      }
    // -agentlib and -agentpath
    } else if (match_option(option, "-agentlib:", &tail) ||
          (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
      if(tail != NULL) {
        const char* pos = strchr(tail, '=');
        size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
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        char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
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        name[len] = '\0';

        char *options = NULL;
        if(pos != NULL) {
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          options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
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        }
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#if !INCLUDE_JVMTI
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        if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
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          warning("profiling and debugging agents are not supported in this VM");
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        } else
2263
#endif // !INCLUDE_JVMTI
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        add_init_agent(name, options, is_absolute_path);

      }
    // -javaagent
    } else if (match_option(option, "-javaagent:", &tail)) {
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#if !INCLUDE_JVMTI
      warning("Instrumentation agents are not supported in this VM");
#else
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      if(tail != NULL) {
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        char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
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        add_init_agent("instrument", options, false);
      }
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#endif // !INCLUDE_JVMTI
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    // -Xnoclassgc
    } else if (match_option(option, "-Xnoclassgc", &tail)) {
      FLAG_SET_CMDLINE(bool, ClassUnloading, false);
    // -Xincgc: i-CMS
    } else if (match_option(option, "-Xincgc", &tail)) {
      FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
      FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
    // -Xnoincgc: no i-CMS
    } else if (match_option(option, "-Xnoincgc", &tail)) {
      FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
      FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
    // -Xconcgc
    } else if (match_option(option, "-Xconcgc", &tail)) {
      FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
    // -Xnoconcgc
    } else if (match_option(option, "-Xnoconcgc", &tail)) {
      FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
    // -Xbatch
    } else if (match_option(option, "-Xbatch", &tail)) {
      FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
    // -Xmn for compatibility with other JVM vendors
    } else if (match_option(option, "-Xmn", &tail)) {
2299
      julong long_initial_eden_size = 0;
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      ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
                    "Invalid initial eden size: %s\n", option->optionString);
        describe_range_error(errcode);
        return JNI_EINVAL;
      }
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      FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
      FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
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    // -Xms
    } else if (match_option(option, "-Xms", &tail)) {
2311
      julong long_initial_heap_size = 0;
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      ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
      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;
      }
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      FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
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      // Currently the minimum size and the initial heap sizes are the same.
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      set_min_heap_size(InitialHeapSize);
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    // -Xmx
    } else if (match_option(option, "-Xmx", &tail)) {
2324
      julong long_max_heap_size = 0;
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      ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
                    "Invalid maximum heap size: %s\n", option->optionString);
        describe_range_error(errcode);
        return JNI_EINVAL;
      }
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      FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
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    // Xmaxf
    } else if (match_option(option, "-Xmaxf", &tail)) {
      int maxf = (int)(atof(tail) * 100);
      if (maxf < 0 || maxf > 100) {
        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)) {
      int minf = (int)(atof(tail) * 100);
      if (minf < 0 || minf > 100) {
        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)) {
2357
      julong long_ThreadStackSize = 0;
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      ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
                    "Invalid thread stack size: %s\n", option->optionString);
        describe_range_error(errcode);
        return JNI_EINVAL;
      }
      // Internally track ThreadStackSize in units of 1024 bytes.
      FLAG_SET_CMDLINE(intx, ThreadStackSize,
                              round_to((int)long_ThreadStackSize, K) / K);
    // -Xoss
    } else if (match_option(option, "-Xoss", &tail)) {
          // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
    // -Xmaxjitcodesize
2372 2373
    } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
               match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2374
      julong long_ReservedCodeCacheSize = 0;
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      ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2376
                                            (size_t)InitialCodeCacheSize);
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      if (errcode != arg_in_range) {
        jio_fprintf(defaultStream::error_stream(),
2379 2380
                    "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
                    option->optionString, InitialCodeCacheSize/K);
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        describe_range_error(errcode);
        return JNI_EINVAL;
      }
      FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
    // -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)) {
2408
#if INCLUDE_FPROF
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      _has_profile = true;
2410
#else // INCLUDE_FPROF
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      // do we have to exit?
2412 2413
      warning("Flat profiling is not supported in this VM.");
#endif // INCLUDE_FPROF
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    // -Xaprof
    } else if (match_option(option, "-Xaprof", &tail)) {
      _has_alloc_profile = true;
    // -Xconcurrentio
    } else if (match_option(option, "-Xconcurrentio", &tail)) {
      FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
      FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
      FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
      FLAG_SET_CMDLINE(bool, UseTLAB, false);
      FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation

      // -Xinternalversion
    } else if (match_option(option, "-Xinternalversion", &tail)) {
      jio_fprintf(defaultStream::output_stream(), "%s\n",
                  VM_Version::internal_vm_info_string());
      vm_exit(0);
#ifndef PRODUCT
    // -Xprintflags
    } else if (match_option(option, "-Xprintflags", &tail)) {
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      CommandLineFlags::printFlags(tty, false);
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      vm_exit(0);
#endif
    // -D
    } else if (match_option(option, "-D", &tail)) {
      if (!add_property(tail)) {
        return JNI_ENOMEM;
      }
      // Out of the box management support
      if (match_option(option, "-Dcom.sun.management", &tail)) {
        FLAG_SET_CMDLINE(bool, ManagementServer, true);
      }
    // -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)) {
2458
#if defined(KERNEL)
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      vm_exit_during_initialization(
          "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2461 2462 2463
#elif !INCLUDE_CDS
      vm_exit_during_initialization(
          "Dumping a shared archive is not supported in this VM.", NULL);
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#else
      FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
      set_mode_flags(_int);     // Prevent compilation, which creates objects
#endif
    // -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);
      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")) {
2516 2517 2518
#if !INCLUDE_JNI_CHECK
        warning("JNI CHECKING is not supported in this VM");
#else
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        CheckJNICalls = true;
2520
#endif // INCLUDE_JNI_CHECK
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      } else if (is_bad_option(option, args->ignoreUnrecognized,
                                     "check")) {
        return JNI_EINVAL;
      }
    } else if (match_option(option, "vfprintf", &tail)) {
      _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
    } else if (match_option(option, "exit", &tail)) {
      _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
    } else if (match_option(option, "abort", &tail)) {
      _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
    // -XX:+AggressiveHeap
    } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {

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

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

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

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

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

      // Make sure that if we have a lot of memory we cap the 32 bit
      // process space.  The 64bit VM version of this function is a nop.
      initHeapSize = os::allocatable_physical_memory(initHeapSize);

      if (FLAG_IS_DEFAULT(MaxHeapSize)) {
         FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
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         FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
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         // Currently the minimum size and the initial heap sizes are the same.
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         set_min_heap_size(initHeapSize);
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      }
      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);
      }

2578
#ifndef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
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      FLAG_SET_DEFAULT(UseLargePages, true);
2580
#endif
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      // 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);
2609 2610
      FLAG_SET_DEFAULT(ParallelGCThreads,
                       Abstract_VM_Version::parallel_worker_threads());
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      // 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)) {
2662
      julong long_tlab_size = 0;
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      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);
SOLARIS_ONLY(
    } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
      warning("-XX:+UsePermISM is obsolete.");
      FLAG_SET_CMDLINE(bool, UseISM, true);
    } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
      FLAG_SET_CMDLINE(bool, UseISM, false);
)
    } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
      FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
      FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
    } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
      FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
      FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
    } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
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#if defined(DTRACE_ENABLED)
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      FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
      FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
      FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
      FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
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#else // defined(DTRACE_ENABLED)
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      jio_fprintf(defaultStream::error_stream(),
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                  "ExtendedDTraceProbes flag is not applicable for this configuration\n");
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      return JNI_EINVAL;
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#endif // defined(DTRACE_ENABLED)
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#ifdef ASSERT
2702
    } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
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      FLAG_SET_CMDLINE(bool, FullGCALot, true);
      // disable scavenge before parallel mark-compact
      FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
#endif
2707
    } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
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      julong cms_blocks_to_claim = (julong)atol(tail);
      FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
      jio_fprintf(defaultStream::error_stream(),
2711 2712 2713 2714 2715 2716 2717
        "Please use -XX:OldPLABSize in place of "
        "-XX:CMSParPromoteBlocksToClaim in the future\n");
    } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
      julong cms_blocks_to_claim = (julong)atol(tail);
      FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
      jio_fprintf(defaultStream::error_stream(),
        "Please use -XX:OldPLABSize in place of "
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        "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2719
    } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2720
      julong old_plab_size = 0;
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      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;
      }
2728
      FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
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      jio_fprintf(defaultStream::error_stream(),
                  "Please use -XX:OldPLABSize in place of "
                  "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2732
    } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2733
      julong young_plab_size = 0;
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      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;
      }
2741
      FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
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      jio_fprintf(defaultStream::error_stream(),
                  "Please use -XX:YoungPLABSize in place of "
                  "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
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    } 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);
2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786
    } 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);
2787 2788 2789 2790 2791
    } 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);
2792
    } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
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      // 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;
    }
  }
2804

2805 2806
  // Change the default value for flags  which have different default values
  // when working with older JDKs.
2807 2808 2809 2810 2811 2812
#ifdef LINUX
 if (JDK_Version::current().compare_major(6) <= 0 &&
      FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
    FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
  }
#endif // LINUX
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  return JNI_OK;
}

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

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

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

#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);
    SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
    SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
  }
2848

2849 2850
  // Tiered compilation is undefined with C1.
  TieredCompilation = false;
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#else
  if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
    FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
  }
#endif

2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878
  // If we are running in a headless jre, force java.awt.headless property
  // to be true unless the property has already been set.
  // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
  if (os::is_headless_jre()) {
    const char* headless = Arguments::get_property("java.awt.headless");
    if (headless == NULL) {
      char envbuffer[128];
      if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
        if (!add_property("java.awt.headless=true")) {
          return JNI_ENOMEM;
        }
      } else {
        char buffer[256];
        strcpy(buffer, "java.awt.headless=");
        strcat(buffer, envbuffer);
        if (!add_property(buffer)) {
          return JNI_ENOMEM;
        }
      }
    }
  }

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  if (!check_vm_args_consistency()) {
    return JNI_ERR;
  }

  return JNI_OK;
}

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

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

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

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

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

      options[i++].optionString = wrt;        // Fill in option
      while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
        if (*rd == '\'' || *rd == '"') {      // handle a quoted string
          int quote = *rd;                    // matching quote to look for
          rd++;                               // don't copy open quote
          while (*rd != quote) {              // include everything (even spaces) up until quote
            if (*rd == 0) {                   // string termination means unmatched string
              jio_fprintf(defaultStream::error_stream(),
                          "Unmatched quote in %s\n", name);
              return JNI_ERR;
            }
            *wrt++ = *rd++;                   // copy to option string
          }
          rd++;                               // don't copy close quote
        } else {
          *wrt++ = *rd++;                     // copy to option string
        }
      }
      // Need to check if we're done before writing a NULL,
      // because the write could be to the byte that rd is pointing to.
      if (*rd++ == 0) {
        *wrt = 0;
        break;
      }
      *wrt = 0;                               // Zero terminate option
    }
    // Construct JavaVMInitArgs structure and parse as if it was part of the command line
    JavaVMInitArgs vm_args;
    vm_args.version = JNI_VERSION_1_2;
    vm_args.options = options;
    vm_args.nOptions = i;
2951
    vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
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    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);
        }
      }
    }

    return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
  }
  return JNI_OK;
}

2968
void Arguments::set_shared_spaces_flags() {
2969 2970 2971
  const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
  const bool might_share = must_share || UseSharedSpaces;

2972 2973 2974 2975 2976 2977
  // CompressedOops cannot be used with CDS.  The offsets of oopmaps and
  // static fields are incorrect in the archive.  With some more clever
  // initialization, this restriction can probably be lifted.
  // ??? UseLargePages might be okay now
  const bool cannot_share = UseCompressedOops ||
                            (UseLargePages && FLAG_IS_CMDLINE(UseLargePages));
2978 2979
  if (cannot_share) {
    if (must_share) {
2980
        warning("disabling large pages %s"
2981 2982 2983 2984
                "because of %s", "" LP64_ONLY("and compressed oops "),
                DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
        FLAG_SET_CMDLINE(bool, UseLargePages, false);
        LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2985
        LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false));
2986
    } else {
2987
      // Prefer compressed oops and large pages to class data sharing
2988
      if (UseSharedSpaces && Verbose) {
2989 2990
        warning("turning off use of shared archive because of large pages%s",
                 "" LP64_ONLY(" and/or compressed oops"));
2991 2992 2993 2994 2995 2996 2997 2998
      }
      no_shared_spaces();
    }
  } else if (UseLargePages && might_share) {
    // Disable large pages to allow shared spaces.  This is sub-optimal, since
    // there may not even be a shared archive to use.
    FLAG_SET_DEFAULT(UseLargePages, false);
  }
2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010

  // Add 2M to any size for SharedReadOnlySize to get around the JPRT setting
  if (DumpSharedSpaces && !FLAG_IS_DEFAULT(SharedReadOnlySize)) {
    SharedReadOnlySize = 14*M;
  }

  if (DumpSharedSpaces) {
    if (RequireSharedSpaces) {
      warning("cannot dump shared archive while using shared archive");
    }
    UseSharedSpaces = false;
  }
3011
}
3012

3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024
// 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)

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3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035
// Parse entry point called from JNI_CreateJavaVM

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

  // Sharing support
  // Construct the path to the archive
  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';
  char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
Z
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      strlen(os::file_separator()) + 20, mtInternal);
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3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048
  if (shared_archive_path == NULL) return JNI_ENOMEM;
  strcpy(shared_archive_path, jvm_path);
  strcat(shared_archive_path, os::file_separator());
  strcat(shared_archive_path, "classes");
  DEBUG_ONLY(strcat(shared_archive_path, "_g");)
  strcat(shared_archive_path, ".jsa");
  SharedArchivePath = shared_archive_path;

  // 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.
3049
  const char* hotspotrc = ".hotspotrc";
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3050
  bool settings_file_specified = false;
3051 3052
  bool needs_hotspotrc_warning = false;

3053
  const char* flags_file;
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3054 3055 3056 3057
  int index;
  for (index = 0; index < args->nOptions; index++) {
    const JavaVMOption *option = args->options + index;
    if (match_option(option, "-XX:Flags=", &tail)) {
3058
      flags_file = tail;
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3059 3060 3061 3062 3063
      settings_file_specified = true;
    }
    if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
      PrintVMOptions = true;
    }
3064 3065 3066
    if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
      PrintVMOptions = false;
    }
3067 3068 3069 3070 3071 3072
    if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
      IgnoreUnrecognizedVMOptions = true;
    }
    if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
      IgnoreUnrecognizedVMOptions = false;
    }
3073
    if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
F
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3074
      CommandLineFlags::printFlags(tty, false);
3075 3076
      vm_exit(0);
    }
Z
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3077
    if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3078
#if INCLUDE_NMT
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3079
      MemTracker::init_tracking_options(tail);
3080 3081 3082
#else
      warning("Native Memory Tracking is not supported in this VM");
#endif
Z
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3083 3084
    }

3085 3086 3087

#ifndef PRODUCT
    if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
F
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3088
      CommandLineFlags::printFlags(tty, true);
3089 3090 3091
      vm_exit(0);
    }
#endif
3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103
  }

  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;
    }
3104
  } else {
3105
#ifdef ASSERT
3106
    // Parse default .hotspotrc settings file
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3107 3108 3109
    if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
      return JNI_EINVAL;
    }
3110 3111 3112 3113 3114
#else
    struct stat buf;
    if (os::stat(hotspotrc, &buf) == 0) {
      needs_hotspotrc_warning = true;
    }
3115
#endif
3116
  }
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3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132

  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;
  }

3133 3134 3135 3136 3137 3138 3139 3140
  // 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);
  }

3141
#if (defined JAVASE_EMBEDDED || defined ARM)
3142 3143 3144
  UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
#endif

3145 3146 3147 3148
#ifdef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
  UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
#endif

3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163
#if !INCLUDE_ALTERNATE_GCS
  if (UseParallelGC) {
    warning("Parallel GC is not supported in this VM.  Using Serial GC.");
  }
  if (UseParallelOldGC) {
    warning("Parallel Old GC is not supported in this VM.  Using Serial GC.");
  }
  if (UseConcMarkSweepGC) {
    warning("Concurrent Mark Sweep GC is not supported in this VM.  Using Serial GC.");
  }
  if (UseParNewGC) {
    warning("Par New GC is not supported in this VM.  Using Serial GC.");
  }
#endif // INCLUDE_ALTERNATE_GCS

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3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175
#ifndef PRODUCT
  if (TraceBytecodesAt != 0) {
    TraceBytecodes = true;
  }
  if (CountCompiledCalls) {
    if (UseCounterDecay) {
      warning("UseCounterDecay disabled because CountCalls is set");
      UseCounterDecay = false;
    }
  }
#endif // PRODUCT

3176 3177 3178 3179 3180 3181 3182
  // 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;
3183 3184
    }
  }
3185 3186

  if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3187
    if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3188
      warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3189 3190 3191
    }
    ScavengeRootsInCode = 1;
  }
3192

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3193 3194 3195 3196 3197
  if (PrintGCDetails) {
    // Turn on -verbose:gc options as well
    PrintGC = true;
  }

3198 3199 3200 3201 3202 3203 3204 3205
  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);
    }
  }

3206 3207 3208
  // Set object alignment values.
  set_object_alignment();

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3209
#ifdef SERIALGC
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  force_serial_gc();
D
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3211
#endif // SERIALGC
3212
#if !INCLUDE_CDS
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3213
  no_shared_spaces();
3214
#endif // INCLUDE_CDS
D
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3215 3216 3217 3218

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

3219
  set_shared_spaces_flags();
3220

3221 3222 3223 3224 3225
  // Check the GC selections again.
  if (!check_gc_consistency()) {
    return JNI_EINVAL;
  }

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3226 3227 3228 3229 3230 3231 3232 3233 3234 3235
  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);
    }
  }

3236 3237
  // Set heap size based on available physical memory
  set_heap_size();
3238 3239

#if INCLUDE_ALTERNATE_GCS
3240 3241 3242 3243
  // Set per-collector flags
  if (UseParallelGC || UseParallelOldGC) {
    set_parallel_gc_flags();
  } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3244
    set_cms_and_parnew_gc_flags();
3245 3246 3247 3248
  } else if (UseParNewGC) {  // skipped if CMS is set above
    set_parnew_gc_flags();
  } else if (UseG1GC) {
    set_g1_gc_flags();
3249
  }
3250
#endif // INCLUDE_ALTERNATE_GCS
3251

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3252 3253 3254 3255 3256 3257 3258 3259 3260 3261
#ifdef SERIALGC
  assert(verify_serial_gc_flags(), "SerialGC unset");
#endif // SERIALGC

  // Set bytecode rewriting flags
  set_bytecode_flags();

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

3262 3263 3264
  // Turn off biased locking for locking debug mode flags,
  // which are subtlely different from each other but neither works with
  // biased locking.
3265 3266 3267 3268 3269
  if (UseHeavyMonitors
#ifdef COMPILER1
      || !UseFastLocking
#endif // COMPILER1
    ) {
3270 3271 3272 3273 3274 3275 3276 3277 3278
    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;
  }

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3279
#ifdef CC_INTERP
T
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3280 3281
  // Clear flags not supported by the C++ interpreter
  FLAG_SET_DEFAULT(ProfileInterpreter, false);
D
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3282
  FLAG_SET_DEFAULT(UseBiasedLocking, false);
T
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3283
  LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3284
  LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
T
twisti 已提交
3285 3286
#endif // CC_INTERP

3287 3288 3289 3290
#ifdef COMPILER2
  if (!UseBiasedLocking || EmitSync != 0) {
    UseOptoBiasInlining = false;
  }
K
kvn 已提交
3291 3292 3293
  if (!EliminateLocks) {
    EliminateNestedLocks = false;
  }
3294 3295
#endif

3296 3297 3298 3299 3300
  if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
    warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
    DebugNonSafepoints = true;
  }

3301 3302 3303 3304 3305 3306 3307 3308 3309
#ifndef PRODUCT
  if (CompileTheWorld) {
    // Force NmethodSweeper to sweep whole CodeCache each time.
    if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
      NmethodSweepFraction = 1;
    }
  }
#endif

D
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3310
  if (PrintCommandLineFlags) {
F
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3311
    CommandLineFlags::printSetFlags(tty);
D
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3312 3313
  }

3314 3315 3316 3317 3318 3319 3320 3321
  // Apply CPU specific policy for the BiasedLocking
  if (UseBiasedLocking) {
    if (!VM_Version::use_biased_locking() &&
        !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
      UseBiasedLocking = false;
    }
  }

3322 3323 3324 3325 3326 3327 3328 3329 3330 3331
  // set PauseAtExit if the gamma launcher was used and a debugger is attached
  // but only if not already set on the commandline
  if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
    bool set = false;
    CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
    if (!set) {
      FLAG_SET_DEFAULT(PauseAtExit, true);
    }
  }

D
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3332 3333 3334
  return JNI_OK;
}

3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350
jint Arguments::adjust_after_os() {
#if INCLUDE_ALTERNATE_GCS
  if (UseParallelGC || UseParallelOldGC) {
    if (UseNUMA) {
      if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
        FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
      }
      // For those collectors or operating systems (eg, Windows) that do
      // not support full UseNUMA, we will map to UseNUMAInterleaving for now
      UseNUMAInterleaving = true;
    }
  }
#endif
  return JNI_OK;
}

D
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3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421
int Arguments::PropertyList_count(SystemProperty* pl) {
  int count = 0;
  while(pl != NULL) {
    count++;
    pl = pl->next();
  }
  return count;
}

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

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

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

  return ret_val;
}

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

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

  return ret_val;
}

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

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

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

// This add maintains unique property key in the list.
P
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3422
void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
D
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3423 3424 3425 3426 3427 3428 3429
  if (plist == NULL)
    return;

  // If property key exist then update with new value.
  SystemProperty* prop;
  for (prop = *plist; prop != NULL; prop = prop->next()) {
    if (strcmp(k, prop->key()) == 0) {
P
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3430 3431 3432 3433 3434
      if (append) {
        prop->append_value(v);
      } else {
        prop->set_value(v);
      }
D
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3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454
      return;
    }
  }

  PropertyList_add(plist, k, v);
}

#ifdef KERNEL
char *Arguments::get_kernel_properties() {
  // Find properties starting with kernel and append them to string
  // We need to find out how long they are first because the URL's that they
  // might point to could get long.
  int length = 0;
  SystemProperty* prop;
  for (prop = _system_properties; prop != NULL; prop = prop->next()) {
    if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
      length += (strlen(prop->key()) + strlen(prop->value()) + 5);  // "-D ="
    }
  }
  // Add one for null terminator.
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3455
  char *props = AllocateHeap(length + 1, mtInternal);
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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
  if (length != 0) {
    int pos = 0;
    for (prop = _system_properties; prop != NULL; prop = prop->next()) {
      if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
        jio_snprintf(&props[pos], length-pos,
                     "-D%s=%s ", prop->key(), prop->value());
        pos = strlen(props);
      }
    }
  }
  // null terminate props in case of null
  props[length] = '\0';
  return props;
}
#endif // KERNEL

// 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
}