jdk8-mips64-public/hotspot: src/share/vm/runtime/arguments.cpp@69333a2fbae2 (annotated)

src/share/vm/runtime/arguments.cpp@69333a2fbae2 (annotated)

src/share/vm/runtime/arguments.cpp

Wed, 15 Feb 2012 16:29:40 -0800

author: iveresov
date: Wed, 15 Feb 2012 16:29:40 -0800
changeset 3573: 69333a2fbae2
parent 3506: 24cae3e4cbaa
child 3579: 15085a6eb50c
permissions: -rw-r--r--

7142680: default GC affected by jvm path
Summary: Removed old tiered code
Reviewed-by: never, kvn

 /*
  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
  * 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.
  *
  * 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.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/javaAssertions.hpp"
 #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"
 #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
 #ifdef TARGET_OS_FAMILY_bsd
 # include "os_bsd.inline.hpp"
 #endif
 #ifndef SERIALGC
 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
 #endif
 // Note: This is a special bug reporting site for the JVM
 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
 #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;
 bool   Arguments::_created_by_gamma_launcher    = false;
 // 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();
 }
   // Update/Initialize System properties after JDK version number is known
 void Arguments::init_version_specific_system_properties() {
   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));
 }
 /**
  * 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) },
   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
   { "DefaultInitialRAMFraction",
                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
   { "UseDepthFirstScavengeOrder",
                            JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
   { "HandlePromotionFailure",
                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
   { "MaxLiveObjectEvacuationRatio",
                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
   { "ForceSharedSpaces",   JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
   { "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) },
   { "AllowTransitionalJSR292",       JDK_Version::jdk(7), JDK_Version::jdk(8) },
   { "UseCompressedStrings",          JDK_Version::jdk(7), JDK_Version::jdk(8) },
 #ifdef PRODUCT
   { "DesiredMethodLimit",
                            JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
 #endif // PRODUCT
   { 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) {
   int i = 0;
   assert(version != NULL, "Must provide a version buffer");
   while (obsolete_jvm_flags[i].name != NULL) {
     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
     // <flag>=xxx form
     // [-|+]<flag> form
     if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
         ((s[0] == '+' || s[0] == '-') &&
         (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;
       }
     }
     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);
   inline void add_suffix_to_prefix(const char* suffix);
   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);
 }
 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 }
 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) {
     FREE_C_HEAP_ARRAY(char, _items[index]);
     _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 {
       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
       memcpy(dirpath, path, tmp_end - path);
       dirpath[tmp_end - path] = '\0';
       expanded_path = add_jars_to_path(expanded_path, dirpath);
       FREE_C_HEAP_ARRAY(char, dirpath);
       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.
   char* cp = NEW_C_HEAP_ARRAY(char, total_len);
   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;
     cp = NEW_C_HEAP_ARRAY(char, len);
     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) {
       cp = NEW_C_HEAP_ARRAY(char, len);
       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
       FREE_C_HEAP_ARRAY(char, path);
     } else {
       cp = REALLOC_C_HEAP_ARRAY(char, path, len);
       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;
   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
   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) {
       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
       path = add_to_path(path, jarpath, false);
       FREE_C_HEAP_ARRAY(char, jarpath);
     }
   }
   FREE_C_HEAP_ARRAY(char, dbuf);
   os::closedir(dir);
   return path;
 }
 // Parses a memory size specification string.
 static bool atomull(const char *s, julong* result) {
   julong n = 0;
   int args_read = sscanf(s, os::julong_format_specifier(), &n);
   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;
       // Check for overflow.
       if (*result/((julong)G * K) != n) return false;
       return true;
     case 'G': case 'g':
       *result = n * G;
       if (*result/G != n) return false;
       return true;
     case 'M': case 'm':
       *result = n * M;
       if (*result/M != n) return false;
       return true;
     case 'K': case 'k':
       *result = n * K;
       if (*result/K != n) return false;
       return true;
     case '\0':
       *result = n;
       return true;
     default:
       return false;
   }
 }
 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
   if (size < min_size) return arg_too_small;
   // Check that size will fit in a size_t (only relevant on 32-bit)
   if (size > max_uintx) return arg_too_big;
   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) {
   julong v;
   intx intx_v;
   bool is_neg = false;
   // Check the sign first since atomull() parses only unsigned values.
   if (*value == '-') {
     if (!CommandLineFlags::intxAt(name, &intx_v)) {
       return false;
     }
     value++;
     is_neg = true;
   }
   if (!atomull(value, &v)) {
     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;
   }
   uint64_t uint64_t_v = (uint64_t) v;
   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
     return true;
   }
   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.
   FREE_C_HEAP_ARRAY(char, value);
   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 {
     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
     // 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.
   FREE_C_HEAP_ARRAY(char, value);
   if (free_this_too != NULL) {
     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
     FREE_C_HEAP_ARRAY(char, free_this_too);
   }
   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) {
     *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
   } else {
     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
   }
   (*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>");
   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("");
   }
 }
 bool Arguments::process_argument(const char* arg,
     jboolean ignore_unrecognized, FlagValueOrigin origin) {
   JDK_Version since = JDK_Version();
   if (parse_argument(arg, origin) || ignore_unrecognized) {
     return true;
   }
   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;
   }
   jio_fprintf(defaultStream::error_stream(),
               "Unrecognized VM option '%s'\n", argname);
   // allow for commandline "commenting out" options like -XX:#+Verbose
   return arg[0] == '#';
 }
 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);
   while(c != EOF) {
     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);
   key = AllocateHeap(key_len + 1, "add_property");
   strncpy(key, prop, key_len);
   key[key_len] = '\0';
   if (eq != NULL) {
     size_t value_len = strlen(prop) - key_len - 1;
     value = AllocateHeap(value_len + 1, "add_property");
     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;
   } else if (strcmp(key, "sun.java.command") == 0) {
     _java_command = value;
     // Record value in Arguments, but let it get passed to Java.
   } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
     // 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;
   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
     // 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;
   } else if (strcmp(key, "sun.boot.library.path") == 0) {
     PropertyList_unique_add(&_system_properties, key, value, true);
     return true;
   }
   // 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",
                           (char*)VM_Version::vm_info_string(), false);
   UseInterpreter             = true;
   UseCompiler                = true;
   UseLoopCounter             = true;
 #ifndef ZERO
   // Turn these off for mixed and comp.  Leave them on for Zero.
   if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
     UseFastAccessorMethods = (mode == _int);
   }
   if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
     UseFastEmptyMethods = (mode == _int);
   }
 #endif
   // 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;
     // 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;
     }
     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);
   }
 }
 void Arguments::set_tiered_flags() {
   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
   }
   if (CompilationPolicyChoice < 2) {
     vm_exit_during_initialization(
       "Incompatible compilation policy selected", NULL);
   }
   // Increase the code cache size - tiered compiles a lot more.
   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
     FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
   }
 }
 #ifndef KERNEL
 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);
   }
 }
 // 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() {
   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
          "control point invariant");
   assert(UseParNewGC, "Error");
   // Turn off AdaptiveSizePolicy for parnew until it is complete.
   disable_adaptive_size_policy("UseParNewGC");
   if (ParallelGCThreads == 0) {
     FLAG_SET_DEFAULT(ParallelGCThreads,
                      Abstract_VM_Version::parallel_worker_threads());
     if (ParallelGCThreads == 1) {
       FLAG_SET_DEFAULT(UseParNewGC, false);
       FLAG_SET_DEFAULT(ParallelGCThreads, 0);
     }
   }
   if (UseParNewGC) {
     // CDS doesn't work with ParNew yet
     no_shared_spaces();
     // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
     // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
     // we set them to 1024 and 1024.
     // See CR 6362902.
     if (FLAG_IS_DEFAULT(YoungPLABSize)) {
       FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
     }
     if (FLAG_IS_DEFAULT(OldPLABSize)) {
       FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
     }
     // AlwaysTenure flag should make ParNew promote all at first collection.
     // See CR 6362902.
     if (AlwaysTenure) {
       FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
     }
     // When using compressed oops, we use local overflow stacks,
     // rather than using a global overflow list chained through
     // the klass word of the object's pre-image.
     if (UseCompressedOops && !ParGCUseLocalOverflow) {
       if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
         warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
       }
       FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
     }
     assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
   }
 }
 // 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() {
   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
   // If we are using CMS, we prefer to UseParNewGC,
   // unless explicitly forbidden.
   if (FLAG_IS_DEFAULT(UseParNewGC)) {
     FLAG_SET_ERGO(bool, UseParNewGC, true);
   }
   // Turn off AdaptiveSizePolicy for CMS until it is complete.
   disable_adaptive_size_policy("UseConcMarkSweepGC");
   // In either case, adjust ParallelGCThreads and/or UseParNewGC
   // as needed.
   if (UseParNewGC) {
     set_parnew_gc_flags();
   }
   // MaxHeapSize is aligned down in collectorPolicy
   size_t max_heap = align_size_down(MaxHeapSize,
                                     CardTableRS::ct_max_alignment_constraint());
   // Now make adjustments for CMS
   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.
   const uintx parallel_gc_threads =
     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
   const size_t preferred_max_new_size_unaligned =
     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
   size_t preferred_max_new_size =
     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
   // Unless explicitly requested otherwise, size young gen
   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
   // 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.
     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
     } else {
       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
     }
     if (PrintGCDetails && Verbose) {
       // Too early to use gclog_or_tty
       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
     }
     // Code along this path potentially sets NewSize and OldSize
     assert(max_heap >= InitialHeapSize, "Error");
     assert(max_heap >= NewSize, "Error");
     if (PrintGCDetails && Verbose) {
       // 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,
            min_heap_size(), InitialHeapSize, max_heap);
     }
     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) {
       // Unless explicitly requested otherwise, make young gen
       // at least min_new, and at most preferred_max_new_size.
       if (FLAG_IS_DEFAULT(NewSize)) {
         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
         if (PrintGCDetails && Verbose) {
           // Too early to use gclog_or_tty
           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
         }
       }
       // Unless explicitly requested otherwise, size old gen
       // so it's NewRatio x of NewSize.
       if (FLAG_IS_DEFAULT(OldSize)) {
         if (max_heap > NewSize) {
           FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
           if (PrintGCDetails && Verbose) {
             // Too early to use gclog_or_tty
             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
           }
         }
       }
     }
   }
   // Unless explicitly requested otherwise, definitely
   // promote all objects surviving "tenuring_default" scavenges.
   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
       FLAG_IS_DEFAULT(SurvivorRatio)) {
     FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
   }
   // 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) {
     FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
   }
   // 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)) {
       // 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);
     } else {
       // 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(),
                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"
                   " options are specified for the CMS collector."
                   " CMSParPromoteBlocksToClaim will take precedence.\n");
     }
   }
   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);
   }
   if (PrintGCDetails && Verbose) {
     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
       MarkStackSize / K, MarkStackSizeMax / K);
     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
   }
 }
 #endif // KERNEL
 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;
 #ifndef KERNEL
   // Set CMS global values
   CompactibleFreeListSpace::set_cms_values();
 #endif // KERNEL
 }
 bool verify_object_alignment() {
   // Object alignment.
   if (!is_power_of_2(ObjectAlignmentInBytes)) {
     jio_fprintf(defaultStream::error_stream(),
                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
                 (int)ObjectAlignmentInBytes);
     return false;
   }
   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
     jio_fprintf(defaultStream::error_stream(),
                 "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());
     return false;
   }
   return true;
 }
 inline uintx max_heap_for_compressed_oops() {
   // Avoid sign flip.
   if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
     return 0;
   }
   LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
   NOT_LP64(ShouldNotReachHere(); return 0);
 }
 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() {
   // Parallel GC is not compatible with sharing. If one specifies
   // that they want sharing explicitly, do not set ergonomics flags.
   if (DumpSharedSpaces || RequireSharedSpaces) {
     return;
   }
   if (os::is_server_class_machine()) {
     // If no other collector is requested explicitly,
     // let the VM select the collector based on
     // machine class and automatic selection policy.
     if (!UseSerialGC &&
         !UseConcMarkSweepGC &&
         !UseG1GC &&
         !UseParNewGC &&
         !DumpSharedSpaces &&
         FLAG_IS_DEFAULT(UseParallelGC)) {
       if (should_auto_select_low_pause_collector()) {
         FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
       } else {
         FLAG_SET_ERGO(bool, UseParallelGC, true);
       }
       no_shared_spaces();
     }
   }
 #ifndef ZERO
 #ifdef _LP64
   // Check that UseCompressedOops can be set with the max heap size allocated
   // by ergonomics.
   if (MaxHeapSize <= max_heap_for_compressed_oops()) {
 #if !defined(COMPILER1) || defined(TIERED)
 // disable UseCompressedOops by default on MacOS X until 7118647 is fixed
 #ifndef __APPLE__
     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
       FLAG_SET_ERGO(bool, UseCompressedOops, true);
     }
 #endif // !__APPLE__
 #endif
 #ifdef _WIN64
     if (UseLargePages && UseCompressedOops) {
       // Cannot allocate guard pages for implicit checks in indexed addressing
       // mode, when large pages are specified on windows.
       // This flag could be switched ON if narrow oop base address is set to 0,
       // see code in Universe::initialize_heap().
       Universe::set_narrow_oop_use_implicit_null_checks(false);
     }
 #endif //  _WIN64
   } else {
     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
       warning("Max heap size too large for Compressed Oops");
       FLAG_SET_DEFAULT(UseCompressedOops, false);
     }
   }
   // Also checks that certain machines are slower with compressed oops
   // in vm_version initialization code.
 #endif // _LP64
 #endif // !ZERO
 }
 void Arguments::set_parallel_gc_flags() {
   assert(UseParallelGC || UseParallelOldGC, "Error");
   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
     FLAG_SET_DEFAULT(UseParallelOldGC, true);
   }
   FLAG_SET_DEFAULT(UseParallelGC, true);
   // If no heap maximum was requested explicitly, use some reasonable fraction
   // of the physical memory, up to a maximum of 1GB.
   if (UseParallelGC) {
     FLAG_SET_DEFAULT(ParallelGCThreads,
                      Abstract_VM_Version::parallel_worker_threads());
     // 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
       // minimums.  These are different defaults because of the different
       // interpretation and are not ergonomically set.
       if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
         FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
       }
       if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
         FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
       }
     }
   }
   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;
   }
 }
 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,
                      Abstract_VM_Version::parallel_worker_threads());
   }
   no_shared_spaces();
   if (FLAG_IS_DEFAULT(MarkStackSize)) {
     FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
   }
   if (PrintGCDetails && Verbose) {
     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
       MarkStackSize / K, MarkStackSizeMax / K);
     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
   }
   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);
   }
 }
 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.
   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
     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
       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);
     }
     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);
     }
     if (PrintGCDetails && Verbose) {
       // Cannot use gclog_or_tty yet.
       tty->print_cr("  Maximum heap size " SIZE_FORMAT, reasonable_max);
     }
     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)) {
     julong reasonable_minimum = (julong)(OldSize + NewSize);
     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
     reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
     julong reasonable_initial = phys_mem / InitialRAMFraction;
     reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
     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);
       tty->print_cr("  Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
     }
     FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
     set_min_heap_size((uintx)reasonable_minimum);
   }
 }
 // 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() {
 #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];
     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
     add_property(buffer);
   }
   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
   }
 #endif
   if (AggressiveOpts) {
 // Sample flag setting code
 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
 //    }
   }
 }
 //===========================================================================================================
 // 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);
   if (strcmp("gamma", _sun_java_launcher) == 0) {
     _created_by_gamma_launcher = true;
   }
 }
 bool Arguments::created_by_java_launcher() {
   assert(_sun_java_launcher != NULL, "property must have value");
   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
 }
 bool Arguments::created_by_gamma_launcher() {
   return _created_by_gamma_launcher;
 }
 //===========================================================================================================
 // Parsing of main arguments
 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;
 }
 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
   // Returns true if given value is at least specified min threshold
   // false, otherwise.
   if (val >= min ) {
       return true;
   }
   jio_fprintf(defaultStream::error_stream(),
               "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
               name, val, min);
   return false;
 }
 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;
 }
 static void force_serial_gc() {
   FLAG_SET_DEFAULT(UseSerialGC, true);
   FLAG_SET_DEFAULT(UseParNewGC, false);
   FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
   FLAG_SET_DEFAULT(UseParallelGC, false);
   FLAG_SET_DEFAULT(UseParallelOldGC, false);
   FLAG_SET_DEFAULT(UseG1GC, false);
 }
 static bool verify_serial_gc_flags() {
   return (UseSerialGC &&
         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
           UseParallelGC || UseParallelOldGC));
 }
 // 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(),
                   "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
                   "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");
   }
 }
 // Check consistency of GC selection
 bool Arguments::check_gc_consistency() {
   check_gclog_consistency();
   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++;
   if (UseG1GC)                           i++;
   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;
 }
 // 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");
   // greater stack shadow pages can't generate instruction to bang stack
   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
   return status;
 }
 // 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;
   }
   status = status && verify_percentage(AdaptiveSizePolicyWeight,
                               "AdaptiveSizePolicyWeight");
   status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
   status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
   status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
   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.
   }
   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);
     }
   }
   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
   if (GCTimeLimit == 100) {
     // Turn off gc-overhead-limit-exceeded checks
     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
   }
   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
   status = status && check_gc_consistency();
   status = status && check_stack_pages();
   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 {
       status = status && verify_percentage(CMSIncrementalDutyCycle,
                                   "CMSIncrementalDutyCycle");
       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
                                   "CMSIncrementalDutyCycleMin");
       status = status && verify_percentage(CMSIncrementalSafetyFactor,
                                   "CMSIncrementalSafetyFactor");
       status = status && verify_percentage(CMSIncrementalOffset,
                                   "CMSIncrementalOffset");
       status = status && verify_percentage(CMSExpAvgFactor,
                                   "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(),
                 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
                 " with -UseAsyncConcMarkSweepGC");
     status = false;
   }
   status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
 #ifndef SERIALGC
   if (UseG1GC) {
     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
                                          "InitiatingHeapOccupancyPercent");
     status = status && verify_min_value(G1RefProcDrainInterval, 1,
                                         "G1RefProcDrainInterval");
     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
                                         "G1ConcMarkStepDurationMillis");
   }
 #endif
   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,
 , 100, "TLABWasteTargetPercent");
   status = status && verify_object_alignment();
   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;
 }
 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;
 }
 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
                                                   julong* long_arg,
                                                   julong min_size) {
   if (!atomull(s, long_arg)) return arg_unreadable;
   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;
   // Setup flags for mixed which is the default
   set_mode_flags(_mixed);
   // 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;
   }
   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);
     char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
     strcpy(altclasses_path, get_meta_index_dir());
     strcat(altclasses_path, altclasses_jar);
     scp.add_suffix_to_prefix(altclasses_path);
     scp_assembly_required = true;
     FREE_C_HEAP_ARRAY(char, altclasses_path);
   }
   // 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)) {
       if (tail != NULL) {
         const char* pos = strchr(tail, ':');
         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
         name[len] = '\0';
         char *options = NULL;
         if(pos != NULL) {
           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
         }
 #ifdef JVMTI_KERNEL
         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
           warning("profiling and debugging agents are not supported with Kernel VM");
         } else
 #endif // JVMTI_KERNEL
         add_init_library(name, options);
       }
     // -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;
         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
         name[len] = '\0';
         char *options = NULL;
         if(pos != NULL) {
           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
         }
 #ifdef JVMTI_KERNEL
         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
           warning("profiling and debugging agents are not supported with Kernel VM");
         } else
 #endif // JVMTI_KERNEL
         add_init_agent(name, options, is_absolute_path);
       }
     // -javaagent
     } else if (match_option(option, "-javaagent:", &tail)) {
       if(tail != NULL) {
         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
         add_init_agent("instrument", options, false);
       }
     // -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)) {
       julong long_initial_eden_size = 0;
       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;
       }
       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
     // -Xms
     } else if (match_option(option, "-Xms", &tail)) {
       julong long_initial_heap_size = 0;
       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;
       }
       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
       // Currently the minimum size and the initial heap sizes are the same.
       set_min_heap_size(InitialHeapSize);
     // -Xmx
     } else if (match_option(option, "-Xmx", &tail)) {
       julong long_max_heap_size = 0;
       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;
       }
       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
     // 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)) {
       julong long_ThreadStackSize = 0;
       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
     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
       julong long_ReservedCodeCacheSize = 0;
       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
                                             (size_t)InitialCodeCacheSize);
       if (errcode != arg_in_range) {
         jio_fprintf(defaultStream::error_stream(),
                     "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
                     option->optionString, InitialCodeCacheSize/K);
         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)) {
 #ifndef FPROF_KERNEL
       _has_profile = true;
 #else // FPROF_KERNEL
       // do we have to exit?
       warning("Kernel VM does not support flat profiling.");
 #endif // FPROF_KERNEL
     // -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)) {
       CommandLineFlags::printFlags(tty, false);
       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)) {
 #ifdef TIERED
       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
       set_mode_flags(_int);     // Prevent compilation, which creates objects
 #elif defined(COMPILER2)
       vm_exit_during_initialization(
           "Dumping a shared archive is not supported on the Server JVM.", NULL);
 #elif defined(KERNEL)
       vm_exit_during_initialization(
           "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
 #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")) {
         CheckJNICalls = true;
       } 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);
       // The perm gen is separate but contiguous with the
       // object heap (and is reserved with it) so subtract it
       // from the heap size.
       if (initHeapSize > MaxPermSize) {
         initHeapSize = initHeapSize - MaxPermSize;
       } else {
         warning("AggressiveHeap and MaxPermSize values may conflict");
       }
       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
          // Currently the minimum size and the initial heap sizes are the same.
          set_min_heap_size(initHeapSize);
       }
       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);
       }
       FLAG_SET_DEFAULT(UseLargePages, true);
       // 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
       // CompilationPolicyChoice=0 causes the server compiler to adopt
       // a more conservative which-method-do-I-compile policy when one
       // of the counters maintained by the interpreter trips.  The
       // result is reduced startup time and improved specjbb and
       // alacrity performance.  Zero is the default, but we set it
       // explicitly here in case the default changes.
       // See runtime/compilationPolicy.*.
       FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
       // Enable parallel GC and adaptive generation sizing
       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
       FLAG_SET_DEFAULT(ParallelGCThreads,
                        Abstract_VM_Version::parallel_worker_threads());
       // 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)) {
       julong long_tlab_size = 0;
       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)) {
 #if defined(DTRACE_ENABLED)
       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
 #else // defined(DTRACE_ENABLED)
       jio_fprintf(defaultStream::error_stream(),
                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
       return JNI_EINVAL;
 #endif // defined(DTRACE_ENABLED)
 #ifdef ASSERT
     } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
       FLAG_SET_CMDLINE(bool, FullGCALot, true);
       // disable scavenge before parallel mark-compact
       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
 #endif
     } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &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 "
         "-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 "
         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
     } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
       julong old_plab_size = 0;
       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;
       }
       FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
       jio_fprintf(defaultStream::error_stream(),
                   "Please use -XX:OldPLABSize in place of "
                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
     } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
       julong young_plab_size = 0;
       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;
       }
       FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
       jio_fprintf(defaultStream::error_stream(),
                   "Please use -XX:YoungPLABSize in place of "
                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
     } 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);
     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
       // 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;
     }
   }
   // Change the default value for flags  which have different default values
   // when working with older JDKs.
   if (JDK_Version::current().compare_major(6) <= 0 &&
       FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
     FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
   }
 #ifdef LINUX
  if (JDK_Version::current().compare_major(6) <= 0 &&
       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
   }
 #endif // LINUX
   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));
   }
   // Tiered compilation is undefined with C1.
   TieredCompilation = false;
 #else
   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
   }
 #endif
   // 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;
         }
       }
     }
   }
   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;
     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
     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;
 }
 void Arguments::set_shared_spaces_flags() {
   const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
   const bool might_share = must_share || UseSharedSpaces;
   // The string table is part of the shared archive so the size must match.
   if (!FLAG_IS_DEFAULT(StringTableSize)) {
     // Disable sharing.
     if (must_share) {
       warning("disabling shared archive %s because of non-default "
               "StringTableSize", DumpSharedSpaces ? "creation" : "use");
     }
     if (might_share) {
       FLAG_SET_DEFAULT(DumpSharedSpaces, false);
       FLAG_SET_DEFAULT(RequireSharedSpaces, false);
       FLAG_SET_DEFAULT(UseSharedSpaces, false);
     }
     return;
   }
   // Check whether class data sharing settings conflict with GC, compressed oops
   // or page size, and fix them up.  Explicit sharing options override other
   // settings.
   const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
     UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
     UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
   if (cannot_share) {
     if (must_share) {
         warning("selecting serial gc and disabling large pages %s"
                 "because of %s", "" LP64_ONLY("and compressed oops "),
                 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
         force_serial_gc();
         FLAG_SET_CMDLINE(bool, UseLargePages, false);
         LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
     } else {
       if (UseSharedSpaces && Verbose) {
         warning("turning off use of shared archive because of "
                 "choice of garbage collector or large pages");
       }
       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);
   }
 }
 // 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)
 // 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) +
                                         strlen(os::file_separator()) + 20);
   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.
   bool settings_file_specified = false;
   const char* flags_file;
   int index;
   for (index = 0; index < args->nOptions; index++) {
     const JavaVMOption *option = args->options + index;
     if (match_option(option, "-XX:Flags=", &tail)) {
       flags_file = tail;
       settings_file_specified = true;
     }
     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
       PrintVMOptions = true;
     }
     if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
       PrintVMOptions = false;
     }
     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
       IgnoreUnrecognizedVMOptions = true;
     }
     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
       IgnoreUnrecognizedVMOptions = false;
     }
     if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
       CommandLineFlags::printFlags(tty, false);
       vm_exit(0);
     }
 #ifndef PRODUCT
     if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
       CommandLineFlags::printFlags(tty, true);
       vm_exit(0);
     }
 #endif
   }
   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;
     }
   }
   // Parse default .hotspotrc settings file
   if (!settings_file_specified) {
     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
       return JNI_EINVAL;
     }
   }
   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;
   }
 #ifdef JAVASE_EMBEDDED
   UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
 #endif
 #ifndef PRODUCT
   if (TraceBytecodesAt != 0) {
     TraceBytecodes = true;
   }
   if (CountCompiledCalls) {
     if (UseCounterDecay) {
       warning("UseCounterDecay disabled because CountCalls is set");
       UseCounterDecay = false;
     }
   }
 #endif // PRODUCT
   // Transitional
   if (EnableMethodHandles || AnonymousClasses) {
     if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
       warning("EnableMethodHandles and AnonymousClasses are obsolete.  Keeping EnableInvokeDynamic disabled.");
     } else {
       EnableInvokeDynamic = true;
     }
   }
   // 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;
     }
   }
   if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
       warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
     }
     ScavengeRootsInCode = 1;
   }
   if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
       warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
     }
     ScavengeRootsInCode = 1;
   }
   if (PrintGCDetails) {
     // Turn on -verbose:gc options as well
     PrintGC = true;
   }
   // Set object alignment values.
   set_object_alignment();
 #ifdef SERIALGC
   force_serial_gc();
 #endif // SERIALGC
 #ifdef KERNEL
   no_shared_spaces();
 #endif // KERNEL
   // Set flags based on ergonomics.
   set_ergonomics_flags();
   set_shared_spaces_flags();
   // Check the GC selections again.
   if (!check_gc_consistency()) {
     return JNI_EINVAL;
   }
   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);
     }
   }
 #ifndef KERNEL
   // Set heap size based on available physical memory
   set_heap_size();
   // Set per-collector flags
   if (UseParallelGC || UseParallelOldGC) {
     set_parallel_gc_flags();
   } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
     set_cms_and_parnew_gc_flags();
   } else if (UseParNewGC) {  // skipped if CMS is set above
     set_parnew_gc_flags();
   } else if (UseG1GC) {
     set_g1_gc_flags();
   }
 #endif // KERNEL
 #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();
   // Turn off biased locking for locking debug mode flags,
   // which are subtlely different from each other but neither works with
   // biased locking.
   if (UseHeavyMonitors
 #ifdef COMPILER1
       || !UseFastLocking
 #endif // COMPILER1
     ) {
     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;
   }
 #ifdef CC_INTERP
   // Clear flags not supported by the C++ interpreter
   FLAG_SET_DEFAULT(ProfileInterpreter, false);
   FLAG_SET_DEFAULT(UseBiasedLocking, false);
   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
 #endif // CC_INTERP
 #ifdef COMPILER2
   if (!UseBiasedLocking || EmitSync != 0) {
     UseOptoBiasInlining = false;
   }
   if (!EliminateLocks) {
     EliminateNestedLocks = false;
   }
 #endif
   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
     DebugNonSafepoints = true;
   }
 #ifndef PRODUCT
   if (CompileTheWorld) {
     // Force NmethodSweeper to sweep whole CodeCache each time.
     if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
       NmethodSweepFraction = 1;
     }
   }
 #endif
   if (PrintCommandLineFlags) {
     CommandLineFlags::printSetFlags(tty);
   }
   // Apply CPU specific policy for the BiasedLocking
   if (UseBiasedLocking) {
     if (!VM_Version::use_biased_locking() &&
         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
       UseBiasedLocking = false;
     }
   }
   // 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);
     }
   }
   return JNI_OK;
 }
 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.
 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
   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) {
       if (append) {
         prop->append_value(v);
       } else {
         prop->set_value(v);
       }
       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.
   char *props = AllocateHeap(length + 1, "get_kernel_properties");
   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
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/arguments.cpp@69333a2fbae2 (annotated)

src/share/vm/runtime/arguments.cpp