1 /*
   2  * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "memory/allocation.inline.hpp"
  27 #include "oops/oop.inline.hpp"
  28 #include "runtime/arguments.hpp"
  29 #include "runtime/globals.hpp"
  30 #include "runtime/globals_extension.hpp"
  31 #include "runtime/commandLineFlagConstraintList.hpp"
  32 #include "runtime/commandLineFlagWriteableList.hpp"
  33 #include "runtime/commandLineFlagRangeList.hpp"
  34 #include "runtime/os.hpp"
  35 #include "runtime/sharedRuntime.hpp"
  36 #include "trace/tracing.hpp"
  37 #include "utilities/defaultStream.hpp"
  38 #include "utilities/macros.hpp"
  39 #include "utilities/ostream.hpp"
  40 #if INCLUDE_ALL_GCS
  41 #include "gc/g1/g1_globals.hpp"
  42 #endif // INCLUDE_ALL_GCS
  43 #ifdef COMPILER1
  44 #include "c1/c1_globals.hpp"
  45 #endif
  46 #if INCLUDE_JVMCI
  47 #include "jvmci/jvmci_globals.hpp"
  48 #endif
  49 #ifdef COMPILER2
  50 #include "opto/c2_globals.hpp"
  51 #endif
  52 #ifdef SHARK
  53 #include "shark/shark_globals.hpp"
  54 #endif
  55 
  56 RUNTIME_FLAGS(MATERIALIZE_DEVELOPER_FLAG, \
  57               MATERIALIZE_PD_DEVELOPER_FLAG, \
  58               MATERIALIZE_PRODUCT_FLAG, \
  59               MATERIALIZE_PD_PRODUCT_FLAG, \
  60               MATERIALIZE_DIAGNOSTIC_FLAG, \
  61               MATERIALIZE_PD_DIAGNOSTIC_FLAG, \
  62               MATERIALIZE_EXPERIMENTAL_FLAG, \
  63               MATERIALIZE_NOTPRODUCT_FLAG, \
  64               MATERIALIZE_MANAGEABLE_FLAG, \
  65               MATERIALIZE_PRODUCT_RW_FLAG, \
  66               MATERIALIZE_LP64_PRODUCT_FLAG, \
  67               IGNORE_RANGE, \
  68               IGNORE_CONSTRAINT, \
  69               IGNORE_WRITEABLE)
  70 
  71 RUNTIME_OS_FLAGS(MATERIALIZE_DEVELOPER_FLAG, \
  72                  MATERIALIZE_PD_DEVELOPER_FLAG, \
  73                  MATERIALIZE_PRODUCT_FLAG, \
  74                  MATERIALIZE_PD_PRODUCT_FLAG, \
  75                  MATERIALIZE_DIAGNOSTIC_FLAG, \
  76                  MATERIALIZE_PD_DIAGNOSTIC_FLAG, \
  77                  MATERIALIZE_NOTPRODUCT_FLAG, \
  78                  IGNORE_RANGE, \
  79                  IGNORE_CONSTRAINT, \
  80                  IGNORE_WRITEABLE)
  81 
  82 ARCH_FLAGS(MATERIALIZE_DEVELOPER_FLAG, \
  83            MATERIALIZE_PRODUCT_FLAG, \
  84            MATERIALIZE_DIAGNOSTIC_FLAG, \
  85            MATERIALIZE_EXPERIMENTAL_FLAG, \
  86            MATERIALIZE_NOTPRODUCT_FLAG, \
  87            IGNORE_RANGE, \
  88            IGNORE_CONSTRAINT, \
  89            IGNORE_WRITEABLE)
  90 
  91 MATERIALIZE_FLAGS_EXT
  92 
  93 #define DEFAULT_RANGE_STR_CHUNK_SIZE 64
  94 static char* create_range_str(const char *fmt, ...) {
  95   static size_t string_length = DEFAULT_RANGE_STR_CHUNK_SIZE;
  96   static char* range_string = NEW_C_HEAP_ARRAY(char, string_length, mtLogging);
  97 
  98   int size_needed = 0;
  99   do {
 100     va_list args;
 101     va_start(args, fmt);
 102     size_needed = jio_vsnprintf(range_string, string_length, fmt, args);
 103     va_end(args);
 104 
 105     if (size_needed < 0) {
 106       string_length += DEFAULT_RANGE_STR_CHUNK_SIZE;
 107       range_string = REALLOC_C_HEAP_ARRAY(char, range_string, string_length, mtLogging);
 108       guarantee(range_string != NULL, "create_range_str string should not be NULL");
 109     }
 110   } while (size_needed < 0);
 111 
 112   return range_string;
 113 }
 114 
 115 const char* Flag::get_int_default_range_str() {
 116   return create_range_str("[ " INT32_FORMAT_W(-25) " ... " INT32_FORMAT_W(25) " ]", INT_MIN, INT_MAX);
 117 }
 118 
 119 const char* Flag::get_uint_default_range_str() {
 120   return create_range_str("[ " UINT32_FORMAT_W(-25) " ... " UINT32_FORMAT_W(25) " ]", 0, UINT_MAX);
 121 }
 122 
 123 const char* Flag::get_intx_default_range_str() {
 124   return create_range_str("[ " INTX_FORMAT_W(-25) " ... " INTX_FORMAT_W(25) " ]", min_intx, max_intx);
 125 }
 126 
 127 const char* Flag::get_uintx_default_range_str() {
 128   return create_range_str("[ " UINTX_FORMAT_W(-25) " ... " UINTX_FORMAT_W(25) " ]", 0, max_uintx);
 129 }
 130 
 131 const char* Flag::get_uint64_t_default_range_str() {
 132   return create_range_str("[ " UINT64_FORMAT_W(-25) " ... " UINT64_FORMAT_W(25) " ]", 0, uint64_t(max_juint));
 133 }
 134 
 135 const char* Flag::get_size_t_default_range_str() {
 136   return create_range_str("[ " SIZE_FORMAT_W(-25) " ... " SIZE_FORMAT_W(25) " ]", 0, SIZE_MAX);
 137 }
 138 
 139 const char* Flag::get_double_default_range_str() {
 140   return create_range_str("[ %-25.3f ... %25.3f ]", DBL_MIN, DBL_MAX);
 141 }
 142 
 143 static bool is_product_build() {
 144 #ifdef PRODUCT
 145   return true;
 146 #else
 147   return false;
 148 #endif
 149 }
 150 
 151 Flag::Error Flag::check_writable(bool changed) {
 152   if (is_constant_in_binary()) {
 153     fatal("flag is constant: %s", _name);
 154   }
 155 
 156   Flag::Error error = Flag::SUCCESS;
 157   if (changed) {
 158     CommandLineFlagWriteable* writeable = CommandLineFlagWriteableList::find(_name);
 159     if (writeable) {
 160       if (writeable->is_writeable() == false) {
 161         switch (writeable->type())
 162         {
 163           case CommandLineFlagWriteable::Once:
 164             error = Flag::SET_ONLY_ONCE;
 165             jio_fprintf(defaultStream::error_stream(), "Error: %s may not be set more than once\n", _name);
 166             break;
 167           case CommandLineFlagWriteable::CommandLineOnly:
 168             error = Flag::COMMAND_LINE_ONLY;
 169             jio_fprintf(defaultStream::error_stream(), "Error: %s may be modified only from commad line\n", _name);
 170             break;
 171           default:
 172             ShouldNotReachHere();
 173             break;
 174         }
 175       }
 176       writeable->mark_once();
 177     }
 178   }
 179   return error;
 180 }
 181 
 182 bool Flag::is_bool() const {
 183   return strcmp(_type, "bool") == 0;
 184 }
 185 
 186 bool Flag::get_bool() const {
 187   return *((bool*) _addr);
 188 }
 189 
 190 Flag::Error Flag::set_bool(bool value) {
 191   Flag::Error error = check_writable(value!=get_bool());
 192   if (error == Flag::SUCCESS) {
 193     *((bool*) _addr) = value;
 194   }
 195   return error;
 196 }
 197 
 198 bool Flag::is_int() const {
 199   return strcmp(_type, "int")  == 0;
 200 }
 201 
 202 int Flag::get_int() const {
 203   return *((int*) _addr);
 204 }
 205 
 206 Flag::Error Flag::set_int(int value) {
 207   Flag::Error error = check_writable(value!=get_int());
 208   if (error == Flag::SUCCESS) {
 209     *((int*) _addr) = value;
 210   }
 211   return error;
 212 }
 213 
 214 bool Flag::is_uint() const {
 215   return strcmp(_type, "uint")  == 0;
 216 }
 217 
 218 uint Flag::get_uint() const {
 219   return *((uint*) _addr);
 220 }
 221 
 222 Flag::Error Flag::set_uint(uint value) {
 223   Flag::Error error = check_writable(value!=get_uint());
 224   if (error == Flag::SUCCESS) {
 225     *((uint*) _addr) = value;
 226   }
 227   return error;
 228 }
 229 
 230 bool Flag::is_intx() const {
 231   return strcmp(_type, "intx")  == 0;
 232 }
 233 
 234 intx Flag::get_intx() const {
 235   return *((intx*) _addr);
 236 }
 237 
 238 Flag::Error Flag::set_intx(intx value) {
 239   Flag::Error error = check_writable(value!=get_intx());
 240   if (error == Flag::SUCCESS) {
 241     *((intx*) _addr) = value;
 242   }
 243   return error;
 244 }
 245 
 246 bool Flag::is_uintx() const {
 247   return strcmp(_type, "uintx") == 0;
 248 }
 249 
 250 uintx Flag::get_uintx() const {
 251   return *((uintx*) _addr);
 252 }
 253 
 254 Flag::Error Flag::set_uintx(uintx value) {
 255   Flag::Error error = check_writable(value!=get_uintx());
 256   if (error == Flag::SUCCESS) {
 257     *((uintx*) _addr) = value;
 258   }
 259   return error;
 260 }
 261 
 262 bool Flag::is_uint64_t() const {
 263   return strcmp(_type, "uint64_t") == 0;
 264 }
 265 
 266 uint64_t Flag::get_uint64_t() const {
 267   return *((uint64_t*) _addr);
 268 }
 269 
 270 Flag::Error Flag::set_uint64_t(uint64_t value) {
 271   Flag::Error error = check_writable(value!=get_uint64_t());
 272   if (error == Flag::SUCCESS) {
 273     *((uint64_t*) _addr) = value;
 274   }
 275   return error;
 276 }
 277 
 278 bool Flag::is_size_t() const {
 279   return strcmp(_type, "size_t") == 0;
 280 }
 281 
 282 size_t Flag::get_size_t() const {
 283   return *((size_t*) _addr);
 284 }
 285 
 286 Flag::Error Flag::set_size_t(size_t value) {
 287   Flag::Error error = check_writable(value!=get_size_t());
 288   if (error == Flag::SUCCESS) {
 289     *((size_t*) _addr) = value;
 290   }
 291   return error;
 292 }
 293 
 294 bool Flag::is_double() const {
 295   return strcmp(_type, "double") == 0;
 296 }
 297 
 298 double Flag::get_double() const {
 299   return *((double*) _addr);
 300 }
 301 
 302 Flag::Error Flag::set_double(double value) {
 303   Flag::Error error = check_writable(value!=get_double());
 304   if (error == Flag::SUCCESS) {
 305     *((double*) _addr) = value;
 306   }
 307   return error;
 308 }
 309 
 310 bool Flag::is_ccstr() const {
 311   return strcmp(_type, "ccstr") == 0 || strcmp(_type, "ccstrlist") == 0;
 312 }
 313 
 314 bool Flag::ccstr_accumulates() const {
 315   return strcmp(_type, "ccstrlist") == 0;
 316 }
 317 
 318 ccstr Flag::get_ccstr() const {
 319   return *((ccstr*) _addr);
 320 }
 321 
 322 Flag::Error Flag::set_ccstr(ccstr value) {
 323   Flag::Error error = check_writable(value!=get_ccstr());
 324   if (error == Flag::SUCCESS) {
 325     *((ccstr*) _addr) = value;
 326   }
 327   return error;
 328 }
 329 
 330 
 331 Flag::Flags Flag::get_origin() {
 332   return Flags(_flags & VALUE_ORIGIN_MASK);
 333 }
 334 
 335 void Flag::set_origin(Flags origin) {
 336   assert((origin & VALUE_ORIGIN_MASK) == origin, "sanity");
 337   Flags new_origin = Flags((origin == COMMAND_LINE) ? Flags(origin | ORIG_COMMAND_LINE) : origin);
 338   _flags = Flags((_flags & ~VALUE_ORIGIN_MASK) | new_origin);
 339 }
 340 
 341 bool Flag::is_default() {
 342   return (get_origin() == DEFAULT);
 343 }
 344 
 345 bool Flag::is_ergonomic() {
 346   return (get_origin() == ERGONOMIC);
 347 }
 348 
 349 bool Flag::is_command_line() {
 350   return (_flags & ORIG_COMMAND_LINE) != 0;
 351 }
 352 
 353 void Flag::set_command_line() {
 354   _flags = Flags(_flags | ORIG_COMMAND_LINE);
 355 }
 356 
 357 bool Flag::is_product() const {
 358   return (_flags & KIND_PRODUCT) != 0;
 359 }
 360 
 361 bool Flag::is_manageable() const {
 362   return (_flags & KIND_MANAGEABLE) != 0;
 363 }
 364 
 365 bool Flag::is_diagnostic() const {
 366   return (_flags & KIND_DIAGNOSTIC) != 0;
 367 }
 368 
 369 bool Flag::is_experimental() const {
 370   return (_flags & KIND_EXPERIMENTAL) != 0;
 371 }
 372 
 373 bool Flag::is_notproduct() const {
 374   return (_flags & KIND_NOT_PRODUCT) != 0;
 375 }
 376 
 377 bool Flag::is_develop() const {
 378   return (_flags & KIND_DEVELOP) != 0;
 379 }
 380 
 381 bool Flag::is_read_write() const {
 382   return (_flags & KIND_READ_WRITE) != 0;
 383 }
 384 
 385 bool Flag::is_commercial() const {
 386   return (_flags & KIND_COMMERCIAL) != 0;
 387 }
 388 
 389 /**
 390  * Returns if this flag is a constant in the binary.  Right now this is
 391  * true for notproduct and develop flags in product builds.
 392  */
 393 bool Flag::is_constant_in_binary() const {
 394 #ifdef PRODUCT
 395     return is_notproduct() || is_develop();
 396 #else
 397     return false;
 398 #endif
 399 }
 400 
 401 bool Flag::is_unlocker() const {
 402   return strcmp(_name, "UnlockDiagnosticVMOptions") == 0     ||
 403          strcmp(_name, "UnlockExperimentalVMOptions") == 0   ||
 404          is_unlocker_ext();
 405 }
 406 
 407 bool Flag::is_unlocked() const {
 408   if (is_diagnostic()) {
 409     return UnlockDiagnosticVMOptions;
 410   }
 411   if (is_experimental()) {
 412     return UnlockExperimentalVMOptions;
 413   }
 414   return is_unlocked_ext();
 415 }
 416 
 417 void Flag::unlock_diagnostic() {
 418   assert(is_diagnostic(), "sanity");
 419   _flags = Flags(_flags & ~KIND_DIAGNOSTIC);
 420 }
 421 
 422 // Get custom message for this locked flag, or NULL if
 423 // none is available. Returns message type produced.
 424 Flag::MsgType Flag::get_locked_message(char* buf, int buflen) const {
 425   buf[0] = '\0';
 426   if (is_diagnostic() && !is_unlocked()) {
 427     jio_snprintf(buf, buflen,
 428                  "Error: VM option '%s' is diagnostic and must be enabled via -XX:+UnlockDiagnosticVMOptions.\n"
 429                  "Error: The unlock option must precede '%s'.\n",
 430                  _name, _name);
 431     return Flag::DIAGNOSTIC_FLAG_BUT_LOCKED;
 432   }
 433   if (is_experimental() && !is_unlocked()) {
 434     jio_snprintf(buf, buflen,
 435                  "Error: VM option '%s' is experimental and must be enabled via -XX:+UnlockExperimentalVMOptions.\n"
 436                  "Error: The unlock option must precede '%s'.\n",
 437                  _name, _name);
 438     return Flag::EXPERIMENTAL_FLAG_BUT_LOCKED;
 439   }
 440   if (is_develop() && is_product_build()) {
 441     jio_snprintf(buf, buflen, "Error: VM option '%s' is develop and is available only in debug version of VM.\n",
 442                  _name);
 443     return Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
 444   }
 445   if (is_notproduct() && is_product_build()) {
 446     jio_snprintf(buf, buflen, "Error: VM option '%s' is notproduct and is available only in debug version of VM.\n",
 447                  _name);
 448     return Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD;
 449   }
 450   get_locked_message_ext(buf, buflen);
 451   return Flag::NONE;
 452 }
 453 
 454 bool Flag::is_writeable() const {
 455   return is_manageable() || (is_product() && is_read_write()) || is_writeable_ext();
 456 }
 457 
 458 // All flags except "manageable" are assumed to be internal flags.
 459 // Long term, we need to define a mechanism to specify which flags
 460 // are external/stable and change this function accordingly.
 461 bool Flag::is_external() const {
 462   return is_manageable() || is_external_ext();
 463 }
 464 
 465 void Flag::print_on(outputStream* st, bool withComments, bool printRanges) {
 466   // Don't print notproduct and develop flags in a product build.
 467   if (is_constant_in_binary()) {
 468     return;
 469   }
 470 
 471   if (!printRanges) {
 472     // The print below assumes that the flag name is 40 characters or less.
 473     // This works for most flags, but there are exceptions. Our longest flag
 474     // name right now is UseAdaptiveGenerationSizePolicyAtMajorCollection and
 475     // its minor collection buddy. These are 48 characters. We use a buffer of
 476     // 10 spaces below to adjust the space between the flag value and the
 477     // column of flag type and origin that is printed in the end of the line.
 478 
 479     // Use some named constants to make code more readable.
 480     char spaces[] = "          ";  // 10 spaces plus NUL
 481     const unsigned int maxFlagLen = 50;
 482     const unsigned int nSpaces = strlen(spaces);
 483 
 484     st->print("%9s %-*s = ", _type, maxFlagLen-nSpaces, _name);
 485 
 486     if (is_bool()) {
 487       st->print("%-20s", get_bool() ? "true" : "false");
 488     } else if (is_int()) {
 489       st->print("%-20d", get_int());
 490     } else if (is_uint()) {
 491       st->print("%-20u", get_uint());
 492     } else if (is_intx()) {
 493       st->print(INTX_FORMAT_W(-20), get_intx());
 494     } else if (is_uintx()) {
 495       st->print(UINTX_FORMAT_W(-20), get_uintx());
 496     } else if (is_uint64_t()) {
 497       st->print(UINT64_FORMAT_W(-20), get_uint64_t());
 498     } else if (is_size_t()) {
 499       st->print(SIZE_FORMAT_W(-20), get_size_t());
 500     } else if (is_double()) {
 501       st->print("%-20f", get_double());
 502     } else if (is_ccstr()) {
 503       const char* cp = get_ccstr();
 504       if (cp != NULL) {
 505         const char* eol;
 506         while ((eol = strchr(cp, '\n')) != NULL) {
 507           size_t llen = pointer_delta(eol, cp, sizeof(char));
 508           st->print("%.*s", (int)llen, cp);
 509           st->cr();
 510           cp = eol+1;
 511           st->print("%5s %-35s += ", "", _name);
 512         }
 513         st->print("%-20s", cp);
 514       }
 515       else st->print("%-20s", "");
 516     }
 517     // Make sure we do not punch a '\0' at a negative char array index.
 518     unsigned int nameLen = strlen(_name);
 519     if (nameLen <= maxFlagLen) {
 520       spaces[maxFlagLen - MAX2(maxFlagLen-nSpaces, nameLen)] = '\0';
 521       st->print("%s", spaces);
 522     }
 523     print_kind_and_origin(st);
 524 
 525 #ifndef PRODUCT
 526     if (withComments) {
 527       st->print("%s", _doc);
 528     }
 529 #endif
 530 
 531     st->cr();
 532 
 533   } else if (!is_bool() && !is_ccstr()) {
 534     st->print("%9s %-50s ", _type, _name);
 535 
 536     RangeStrFunc func = NULL;
 537     if (is_int()) {
 538       func = Flag::get_int_default_range_str;
 539     } else if (is_uint()) {
 540       func = Flag::get_uint_default_range_str;
 541     } else if (is_intx()) {
 542       func = Flag::get_intx_default_range_str;
 543     } else if (is_uintx()) {
 544       func = Flag::get_uintx_default_range_str;
 545     } else if (is_uint64_t()) {
 546       func = Flag::get_uint64_t_default_range_str;
 547     } else if (is_size_t()) {
 548       func = Flag::get_size_t_default_range_str;
 549     } else if (is_double()) {
 550       func = Flag::get_double_default_range_str;
 551     } else {
 552       ShouldNotReachHere();
 553     }
 554     CommandLineFlagRangeList::print(st, _name, func);
 555 
 556     st->print(" %-16s", " ");
 557     print_kind_and_origin(st);
 558 
 559 #ifndef PRODUCT
 560     if (withComments) {
 561       st->print("%s", _doc);
 562     }
 563 #endif
 564 
 565     st->cr();
 566   }
 567 }
 568 
 569 void Flag::print_kind_and_origin(outputStream* st) {
 570   struct Data {
 571     int flag;
 572     const char* name;
 573   };
 574 
 575   Data data[] = {
 576       { KIND_JVMCI, "JVMCI" },
 577       { KIND_C1, "C1" },
 578       { KIND_C2, "C2" },
 579       { KIND_ARCH, "ARCH" },
 580       { KIND_SHARK, "SHARK" },
 581       { KIND_PLATFORM_DEPENDENT, "pd" },
 582       { KIND_PRODUCT, "product" },
 583       { KIND_MANAGEABLE, "manageable" },
 584       { KIND_DIAGNOSTIC, "diagnostic" },
 585       { KIND_EXPERIMENTAL, "experimental" },
 586       { KIND_COMMERCIAL, "commercial" },
 587       { KIND_NOT_PRODUCT, "notproduct" },
 588       { KIND_DEVELOP, "develop" },
 589       { KIND_LP64_PRODUCT, "lp64_product" },
 590       { KIND_READ_WRITE, "rw" },
 591       { -1, "" }
 592   };
 593 
 594   if ((_flags & KIND_MASK) != 0) {
 595     bool is_first = true;
 596     const size_t buffer_size = 64;
 597     size_t buffer_used = 0;
 598     char kind[buffer_size];
 599 
 600     jio_snprintf(kind, buffer_size, "{");
 601     buffer_used++;
 602     for (int i = 0; data[i].flag != -1; i++) {
 603       Data d = data[i];
 604       if ((_flags & d.flag) != 0) {
 605         if (is_first) {
 606           is_first = false;
 607         } else {
 608           assert(buffer_used + 1 < buffer_size, "Too small buffer");
 609           jio_snprintf(kind + buffer_used, buffer_size - buffer_used, " ");
 610           buffer_used++;
 611         }
 612         size_t length = strlen(d.name);
 613         assert(buffer_used + length < buffer_size, "Too small buffer");
 614         jio_snprintf(kind + buffer_used, buffer_size - buffer_used, "%s", d.name);
 615         buffer_used += length;
 616       }
 617     }
 618     assert(buffer_used + 2 <= buffer_size, "Too small buffer");
 619     jio_snprintf(kind + buffer_used, buffer_size - buffer_used, "}");
 620     st->print("%20s", kind);
 621   }
 622 
 623   int origin = _flags & VALUE_ORIGIN_MASK;
 624   st->print(" {");
 625   switch(origin) {
 626     case DEFAULT:
 627       st->print("default"); break;
 628     case COMMAND_LINE:
 629       st->print("command line"); break;
 630     case ENVIRON_VAR:
 631       st->print("environment"); break;
 632     case CONFIG_FILE:
 633       st->print("config file"); break;
 634     case MANAGEMENT:
 635       st->print("management"); break;
 636     case ERGONOMIC:
 637       if (_flags & ORIG_COMMAND_LINE) {
 638         st->print("command line, ");
 639       }
 640       st->print("ergonomic"); break;
 641     case ATTACH_ON_DEMAND:
 642       st->print("attach"); break;
 643     case INTERNAL:
 644       st->print("internal"); break;
 645   }
 646   st->print("}");
 647 }
 648 
 649 void Flag::print_as_flag(outputStream* st) {
 650   if (is_bool()) {
 651     st->print("-XX:%s%s", get_bool() ? "+" : "-", _name);
 652   } else if (is_int()) {
 653     st->print("-XX:%s=%d", _name, get_int());
 654   } else if (is_uint()) {
 655     st->print("-XX:%s=%u", _name, get_uint());
 656   } else if (is_intx()) {
 657     st->print("-XX:%s=" INTX_FORMAT, _name, get_intx());
 658   } else if (is_uintx()) {
 659     st->print("-XX:%s=" UINTX_FORMAT, _name, get_uintx());
 660   } else if (is_uint64_t()) {
 661     st->print("-XX:%s=" UINT64_FORMAT, _name, get_uint64_t());
 662   } else if (is_size_t()) {
 663     st->print("-XX:%s=" SIZE_FORMAT, _name, get_size_t());
 664   } else if (is_double()) {
 665     st->print("-XX:%s=%f", _name, get_double());
 666   } else if (is_ccstr()) {
 667     st->print("-XX:%s=", _name);
 668     const char* cp = get_ccstr();
 669     if (cp != NULL) {
 670       // Need to turn embedded '\n's back into separate arguments
 671       // Not so efficient to print one character at a time,
 672       // but the choice is to do the transformation to a buffer
 673       // and print that.  And this need not be efficient.
 674       for (; *cp != '\0'; cp += 1) {
 675         switch (*cp) {
 676           default:
 677             st->print("%c", *cp);
 678             break;
 679           case '\n':
 680             st->print(" -XX:%s=", _name);
 681             break;
 682         }
 683       }
 684     }
 685   } else {
 686     ShouldNotReachHere();
 687   }
 688 }
 689 
 690 const char* Flag::flag_error_str(Flag::Error error) {
 691   switch (error) {
 692     case Flag::MISSING_NAME: return "MISSING_NAME";
 693     case Flag::MISSING_VALUE: return "MISSING_VALUE";
 694     case Flag::NON_WRITABLE: return "NON_WRITABLE";
 695     case Flag::OUT_OF_BOUNDS: return "OUT_OF_BOUNDS";
 696     case Flag::VIOLATES_CONSTRAINT: return "VIOLATES_CONSTRAINT";
 697     case Flag::INVALID_FLAG: return "INVALID_FLAG";
 698     case Flag::ERR_OTHER: return "ERR_OTHER";
 699     case Flag::SUCCESS: return "SUCCESS";
 700     default: ShouldNotReachHere(); return "NULL";
 701   }
 702 }
 703 
 704 // 4991491 do not "optimize out" the was_set false values: omitting them
 705 // tickles a Microsoft compiler bug causing flagTable to be malformed
 706 
 707 #define RUNTIME_PRODUCT_FLAG_STRUCT(     type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_PRODUCT) },
 708 #define RUNTIME_PD_PRODUCT_FLAG_STRUCT(  type, name,        doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_PRODUCT | Flag::KIND_PLATFORM_DEPENDENT) },
 709 #define RUNTIME_DIAGNOSTIC_FLAG_STRUCT(  type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_DIAGNOSTIC) },
 710 #define RUNTIME_PD_DIAGNOSTIC_FLAG_STRUCT(type, name,       doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_DIAGNOSTIC | Flag::KIND_PLATFORM_DEPENDENT) },
 711 #define RUNTIME_EXPERIMENTAL_FLAG_STRUCT(type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_EXPERIMENTAL) },
 712 #define RUNTIME_MANAGEABLE_FLAG_STRUCT(  type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_MANAGEABLE) },
 713 #define RUNTIME_PRODUCT_RW_FLAG_STRUCT(  type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_PRODUCT | Flag::KIND_READ_WRITE) },
 714 #define RUNTIME_DEVELOP_FLAG_STRUCT(     type, name, value, doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_DEVELOP) },
 715 #define RUNTIME_PD_DEVELOP_FLAG_STRUCT(  type, name,        doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_DEVELOP | Flag::KIND_PLATFORM_DEPENDENT) },
 716 #define RUNTIME_NOTPRODUCT_FLAG_STRUCT(  type, name, value, doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_NOT_PRODUCT) },
 717 
 718 #define JVMCI_PRODUCT_FLAG_STRUCT(       type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_JVMCI | Flag::KIND_PRODUCT) },
 719 #define JVMCI_PD_PRODUCT_FLAG_STRUCT(    type, name,        doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_JVMCI | Flag::KIND_PRODUCT | Flag::KIND_PLATFORM_DEPENDENT) },
 720 #define JVMCI_DIAGNOSTIC_FLAG_STRUCT(    type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_JVMCI | Flag::KIND_DIAGNOSTIC) },
 721 #define JVMCI_PD_DIAGNOSTIC_FLAG_STRUCT( type, name,        doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_JVMCI | Flag::KIND_DIAGNOSTIC | Flag::KIND_PLATFORM_DEPENDENT) },
 722 #define JVMCI_EXPERIMENTAL_FLAG_STRUCT(  type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_JVMCI | Flag::KIND_EXPERIMENTAL) },
 723 #define JVMCI_DEVELOP_FLAG_STRUCT(       type, name, value, doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_JVMCI | Flag::KIND_DEVELOP) },
 724 #define JVMCI_PD_DEVELOP_FLAG_STRUCT(    type, name,        doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_JVMCI | Flag::KIND_DEVELOP | Flag::KIND_PLATFORM_DEPENDENT) },
 725 #define JVMCI_NOTPRODUCT_FLAG_STRUCT(    type, name, value, doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_JVMCI | Flag::KIND_NOT_PRODUCT) },
 726 
 727 #ifdef _LP64
 728 #define RUNTIME_LP64_PRODUCT_FLAG_STRUCT(type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_LP64_PRODUCT) },
 729 #else
 730 #define RUNTIME_LP64_PRODUCT_FLAG_STRUCT(type, name, value, doc) /* flag is constant */
 731 #endif // _LP64
 732 
 733 #define C1_PRODUCT_FLAG_STRUCT(          type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C1 | Flag::KIND_PRODUCT) },
 734 #define C1_PD_PRODUCT_FLAG_STRUCT(       type, name,        doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C1 | Flag::KIND_PRODUCT | Flag::KIND_PLATFORM_DEPENDENT) },
 735 #define C1_DIAGNOSTIC_FLAG_STRUCT(       type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C1 | Flag::KIND_DIAGNOSTIC) },
 736 #define C1_PD_DIAGNOSTIC_FLAG_STRUCT(    type, name,        doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C1 | Flag::KIND_DIAGNOSTIC | Flag::KIND_PLATFORM_DEPENDENT) },
 737 #define C1_DEVELOP_FLAG_STRUCT(          type, name, value, doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C1 | Flag::KIND_DEVELOP) },
 738 #define C1_PD_DEVELOP_FLAG_STRUCT(       type, name,        doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C1 | Flag::KIND_DEVELOP | Flag::KIND_PLATFORM_DEPENDENT) },
 739 #define C1_NOTPRODUCT_FLAG_STRUCT(       type, name, value, doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C1 | Flag::KIND_NOT_PRODUCT) },
 740 
 741 #define C2_PRODUCT_FLAG_STRUCT(          type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C2 | Flag::KIND_PRODUCT) },
 742 #define C2_PD_PRODUCT_FLAG_STRUCT(       type, name,        doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C2 | Flag::KIND_PRODUCT | Flag::KIND_PLATFORM_DEPENDENT) },
 743 #define C2_DIAGNOSTIC_FLAG_STRUCT(       type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C2 | Flag::KIND_DIAGNOSTIC) },
 744 #define C2_PD_DIAGNOSTIC_FLAG_STRUCT(    type, name,        doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C2 | Flag::KIND_DIAGNOSTIC | Flag::KIND_PLATFORM_DEPENDENT) },
 745 #define C2_EXPERIMENTAL_FLAG_STRUCT(     type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C2 | Flag::KIND_EXPERIMENTAL) },
 746 #define C2_DEVELOP_FLAG_STRUCT(          type, name, value, doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C2 | Flag::KIND_DEVELOP) },
 747 #define C2_PD_DEVELOP_FLAG_STRUCT(       type, name,        doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C2 | Flag::KIND_DEVELOP | Flag::KIND_PLATFORM_DEPENDENT) },
 748 #define C2_NOTPRODUCT_FLAG_STRUCT(       type, name, value, doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_C2 | Flag::KIND_NOT_PRODUCT) },
 749 
 750 #define ARCH_PRODUCT_FLAG_STRUCT(        type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_ARCH | Flag::KIND_PRODUCT) },
 751 #define ARCH_DIAGNOSTIC_FLAG_STRUCT(     type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_ARCH | Flag::KIND_DIAGNOSTIC) },
 752 #define ARCH_EXPERIMENTAL_FLAG_STRUCT(   type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_ARCH | Flag::KIND_EXPERIMENTAL) },
 753 #define ARCH_DEVELOP_FLAG_STRUCT(        type, name, value, doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_ARCH | Flag::KIND_DEVELOP) },
 754 #define ARCH_NOTPRODUCT_FLAG_STRUCT(     type, name, value, doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_ARCH | Flag::KIND_NOT_PRODUCT) },
 755 
 756 #define SHARK_PRODUCT_FLAG_STRUCT(       type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_SHARK | Flag::KIND_PRODUCT) },
 757 #define SHARK_PD_PRODUCT_FLAG_STRUCT(    type, name,        doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_SHARK | Flag::KIND_PRODUCT | Flag::KIND_PLATFORM_DEPENDENT) },
 758 #define SHARK_DIAGNOSTIC_FLAG_STRUCT(    type, name, value, doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_SHARK | Flag::KIND_DIAGNOSTIC) },
 759 #define SHARK_PD_DIAGNOSTIC_FLAG_STRUCT( type, name,        doc) { #type, XSTR(name), &name,         NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_SHARK | Flag::KIND_DIAGNOSTIC | Flag::KIND_PLATFORM_DEPENDENT) },
 760 #define SHARK_DEVELOP_FLAG_STRUCT(       type, name, value, doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_SHARK | Flag::KIND_DEVELOP) },
 761 #define SHARK_PD_DEVELOP_FLAG_STRUCT(    type, name,        doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_SHARK | Flag::KIND_DEVELOP | Flag::KIND_PLATFORM_DEPENDENT) },
 762 #define SHARK_NOTPRODUCT_FLAG_STRUCT(    type, name, value, doc) { #type, XSTR(name), (void*) &name, NOT_PRODUCT_ARG(doc) Flag::Flags(Flag::DEFAULT | Flag::KIND_SHARK | Flag::KIND_NOT_PRODUCT) },
 763 
 764 static Flag flagTable[] = {
 765  RUNTIME_FLAGS(RUNTIME_DEVELOP_FLAG_STRUCT, \
 766                RUNTIME_PD_DEVELOP_FLAG_STRUCT, \
 767                RUNTIME_PRODUCT_FLAG_STRUCT, \
 768                RUNTIME_PD_PRODUCT_FLAG_STRUCT, \
 769                RUNTIME_DIAGNOSTIC_FLAG_STRUCT, \
 770                RUNTIME_PD_DIAGNOSTIC_FLAG_STRUCT, \
 771                RUNTIME_EXPERIMENTAL_FLAG_STRUCT, \
 772                RUNTIME_NOTPRODUCT_FLAG_STRUCT, \
 773                RUNTIME_MANAGEABLE_FLAG_STRUCT, \
 774                RUNTIME_PRODUCT_RW_FLAG_STRUCT, \
 775                RUNTIME_LP64_PRODUCT_FLAG_STRUCT, \
 776                IGNORE_RANGE, \
 777                IGNORE_CONSTRAINT, \
 778                IGNORE_WRITEABLE)
 779  RUNTIME_OS_FLAGS(RUNTIME_DEVELOP_FLAG_STRUCT, \
 780                   RUNTIME_PD_DEVELOP_FLAG_STRUCT, \
 781                   RUNTIME_PRODUCT_FLAG_STRUCT, \
 782                   RUNTIME_PD_PRODUCT_FLAG_STRUCT, \
 783                   RUNTIME_DIAGNOSTIC_FLAG_STRUCT, \
 784                   RUNTIME_PD_DIAGNOSTIC_FLAG_STRUCT, \
 785                   RUNTIME_NOTPRODUCT_FLAG_STRUCT, \
 786                   IGNORE_RANGE, \
 787                   IGNORE_CONSTRAINT, \
 788                   IGNORE_WRITEABLE)
 789 #if INCLUDE_ALL_GCS
 790  G1_FLAGS(RUNTIME_DEVELOP_FLAG_STRUCT, \
 791           RUNTIME_PD_DEVELOP_FLAG_STRUCT, \
 792           RUNTIME_PRODUCT_FLAG_STRUCT, \
 793           RUNTIME_PD_PRODUCT_FLAG_STRUCT, \
 794           RUNTIME_DIAGNOSTIC_FLAG_STRUCT, \
 795           RUNTIME_PD_DIAGNOSTIC_FLAG_STRUCT, \
 796           RUNTIME_EXPERIMENTAL_FLAG_STRUCT, \
 797           RUNTIME_NOTPRODUCT_FLAG_STRUCT, \
 798           RUNTIME_MANAGEABLE_FLAG_STRUCT, \
 799           RUNTIME_PRODUCT_RW_FLAG_STRUCT, \
 800           IGNORE_RANGE, \
 801           IGNORE_CONSTRAINT, \
 802           IGNORE_WRITEABLE)
 803 #endif // INCLUDE_ALL_GCS
 804 #if INCLUDE_JVMCI
 805  JVMCI_FLAGS(JVMCI_DEVELOP_FLAG_STRUCT, \
 806              JVMCI_PD_DEVELOP_FLAG_STRUCT, \
 807              JVMCI_PRODUCT_FLAG_STRUCT, \
 808              JVMCI_PD_PRODUCT_FLAG_STRUCT, \
 809              JVMCI_DIAGNOSTIC_FLAG_STRUCT, \
 810              JVMCI_PD_DIAGNOSTIC_FLAG_STRUCT, \
 811              JVMCI_EXPERIMENTAL_FLAG_STRUCT, \
 812              JVMCI_NOTPRODUCT_FLAG_STRUCT, \
 813              IGNORE_RANGE, \
 814              IGNORE_CONSTRAINT, \
 815              IGNORE_WRITEABLE)
 816 #endif // INCLUDE_JVMCI
 817 #ifdef COMPILER1
 818  C1_FLAGS(C1_DEVELOP_FLAG_STRUCT, \
 819           C1_PD_DEVELOP_FLAG_STRUCT, \
 820           C1_PRODUCT_FLAG_STRUCT, \
 821           C1_PD_PRODUCT_FLAG_STRUCT, \
 822           C1_DIAGNOSTIC_FLAG_STRUCT, \
 823           C1_PD_DIAGNOSTIC_FLAG_STRUCT, \
 824           C1_NOTPRODUCT_FLAG_STRUCT, \
 825           IGNORE_RANGE, \
 826           IGNORE_CONSTRAINT, \
 827           IGNORE_WRITEABLE)
 828 #endif // COMPILER1
 829 #ifdef COMPILER2
 830  C2_FLAGS(C2_DEVELOP_FLAG_STRUCT, \
 831           C2_PD_DEVELOP_FLAG_STRUCT, \
 832           C2_PRODUCT_FLAG_STRUCT, \
 833           C2_PD_PRODUCT_FLAG_STRUCT, \
 834           C2_DIAGNOSTIC_FLAG_STRUCT, \
 835           C2_PD_DIAGNOSTIC_FLAG_STRUCT, \
 836           C2_EXPERIMENTAL_FLAG_STRUCT, \
 837           C2_NOTPRODUCT_FLAG_STRUCT, \
 838           IGNORE_RANGE, \
 839           IGNORE_CONSTRAINT, \
 840           IGNORE_WRITEABLE)
 841 #endif // COMPILER2
 842 #ifdef SHARK
 843  SHARK_FLAGS(SHARK_DEVELOP_FLAG_STRUCT, \
 844              SHARK_PD_DEVELOP_FLAG_STRUCT, \
 845              SHARK_PRODUCT_FLAG_STRUCT, \
 846              SHARK_PD_PRODUCT_FLAG_STRUCT, \
 847              SHARK_DIAGNOSTIC_FLAG_STRUCT, \
 848              SHARK_PD_DIAGNOSTIC_FLAG_STRUCT, \
 849              SHARK_NOTPRODUCT_FLAG_STRUCT, \
 850              IGNORE_RANGE, \
 851              IGNORE_CONSTRAINT, \
 852              IGNORE_WRITEABLE)
 853 #endif // SHARK
 854  ARCH_FLAGS(ARCH_DEVELOP_FLAG_STRUCT, \
 855             ARCH_PRODUCT_FLAG_STRUCT, \
 856             ARCH_DIAGNOSTIC_FLAG_STRUCT, \
 857             ARCH_EXPERIMENTAL_FLAG_STRUCT, \
 858             ARCH_NOTPRODUCT_FLAG_STRUCT, \
 859             IGNORE_RANGE, \
 860             IGNORE_CONSTRAINT, \
 861             IGNORE_WRITEABLE)
 862  FLAGTABLE_EXT
 863  {0, NULL, NULL}
 864 };
 865 
 866 Flag* Flag::flags = flagTable;
 867 size_t Flag::numFlags = (sizeof(flagTable) / sizeof(Flag));
 868 
 869 inline bool str_equal(const char* s, const char* q, size_t len) {
 870   // s is null terminated, q is not!
 871   if (strlen(s) != (unsigned int) len) return false;
 872   return strncmp(s, q, len) == 0;
 873 }
 874 
 875 // Search the flag table for a named flag
 876 Flag* Flag::find_flag(const char* name, size_t length, bool allow_locked, bool return_flag) {
 877   for (Flag* current = &flagTable[0]; current->_name != NULL; current++) {
 878     if (str_equal(current->_name, name, length)) {
 879       // Found a matching entry.
 880       // Don't report notproduct and develop flags in product builds.
 881       if (current->is_constant_in_binary()) {
 882         return (return_flag ? current : NULL);
 883       }
 884       // Report locked flags only if allowed.
 885       if (!(current->is_unlocked() || current->is_unlocker())) {
 886         if (!allow_locked) {
 887           // disable use of locked flags, e.g. diagnostic, experimental,
 888           // commercial... until they are explicitly unlocked
 889           return NULL;
 890         }
 891       }
 892       return current;
 893     }
 894   }
 895   // Flag name is not in the flag table
 896   return NULL;
 897 }
 898 
 899 // Compute string similarity based on Dice's coefficient
 900 static float str_similar(const char* str1, const char* str2, size_t len2) {
 901   int len1 = (int) strlen(str1);
 902   int total = len1 + (int) len2;
 903 
 904   int hit = 0;
 905 
 906   for (int i = 0; i < len1 -1; ++i) {
 907     for (int j = 0; j < (int) len2 -1; ++j) {
 908       if ((str1[i] == str2[j]) && (str1[i+1] == str2[j+1])) {
 909         ++hit;
 910         break;
 911       }
 912     }
 913   }
 914 
 915   return 2.0f * (float) hit / (float) total;
 916 }
 917 
 918 Flag* Flag::fuzzy_match(const char* name, size_t length, bool allow_locked) {
 919   float VMOptionsFuzzyMatchSimilarity = 0.7f;
 920   Flag* match = NULL;
 921   float score;
 922   float max_score = -1;
 923 
 924   for (Flag* current = &flagTable[0]; current->_name != NULL; current++) {
 925     score = str_similar(current->_name, name, length);
 926     if (score > max_score) {
 927       max_score = score;
 928       match = current;
 929     }
 930   }
 931 
 932   if (!(match->is_unlocked() || match->is_unlocker())) {
 933     if (!allow_locked) {
 934       return NULL;
 935     }
 936   }
 937 
 938   if (max_score < VMOptionsFuzzyMatchSimilarity) {
 939     return NULL;
 940   }
 941 
 942   return match;
 943 }
 944 
 945 // Returns the address of the index'th element
 946 static Flag* address_of_flag(CommandLineFlagWithType flag) {
 947   assert((size_t)flag < Flag::numFlags, "bad command line flag index");
 948   return &Flag::flags[flag];
 949 }
 950 
 951 bool CommandLineFlagsEx::is_default(CommandLineFlag flag) {
 952   assert((size_t)flag < Flag::numFlags, "bad command line flag index");
 953   Flag* f = &Flag::flags[flag];
 954   return f->is_default();
 955 }
 956 
 957 bool CommandLineFlagsEx::is_ergo(CommandLineFlag flag) {
 958   assert((size_t)flag < Flag::numFlags, "bad command line flag index");
 959   Flag* f = &Flag::flags[flag];
 960   return f->is_ergonomic();
 961 }
 962 
 963 bool CommandLineFlagsEx::is_cmdline(CommandLineFlag flag) {
 964   assert((size_t)flag < Flag::numFlags, "bad command line flag index");
 965   Flag* f = &Flag::flags[flag];
 966   return f->is_command_line();
 967 }
 968 
 969 bool CommandLineFlags::wasSetOnCmdline(const char* name, bool* value) {
 970   Flag* result = Flag::find_flag((char*)name, strlen(name));
 971   if (result == NULL) return false;
 972   *value = result->is_command_line();
 973   return true;
 974 }
 975 
 976 void CommandLineFlagsEx::setOnCmdLine(CommandLineFlagWithType flag) {
 977   Flag* faddr = address_of_flag(flag);
 978   assert(faddr != NULL, "Unknown flag");
 979   faddr->set_command_line();
 980 }
 981 
 982 template<class E, class T>
 983 static void trace_flag_changed(const char* name, const T old_value, const T new_value, const Flag::Flags origin) {
 984   E e;
 985   e.set_name(name);
 986   e.set_oldValue(old_value);
 987   e.set_newValue(new_value);
 988   e.set_origin(origin);
 989   e.commit();
 990 }
 991 
 992 static Flag::Error apply_constraint_and_check_range_bool(const char* name, bool new_value, bool verbose) {
 993   Flag::Error status = Flag::SUCCESS;
 994   CommandLineFlagConstraint* constraint = CommandLineFlagConstraintList::find_if_needs_check(name);
 995   if (constraint != NULL) {
 996     status = constraint->apply_bool(new_value, verbose);
 997   }
 998   return status;
 999 }
1000 
1001 Flag::Error CommandLineFlags::boolAt(const char* name, size_t len, bool* value, bool allow_locked, bool return_flag) {
1002   Flag* result = Flag::find_flag(name, len, allow_locked, return_flag);
1003   if (result == NULL) return Flag::INVALID_FLAG;
1004   if (!result->is_bool()) return Flag::WRONG_FORMAT;
1005   *value = result->get_bool();
1006   return Flag::SUCCESS;
1007 }
1008 
1009 Flag::Error CommandLineFlags::boolAtPut(Flag* flag, bool* value, Flag::Flags origin) {
1010   const char* name;
1011   if (flag == NULL) return Flag::INVALID_FLAG;
1012   if (!flag->is_bool()) return Flag::WRONG_FORMAT;
1013   name = flag->_name;
1014   Flag::Error check = apply_constraint_and_check_range_bool(name, *value, !CommandLineFlagConstraintList::validated_after_ergo());
1015   if (check != Flag::SUCCESS) return check;
1016   bool old_value = flag->get_bool();
1017   trace_flag_changed<EventBooleanFlagChanged, bool>(name, old_value, *value, origin);
1018   check = flag->set_bool(*value);
1019   *value = old_value;
1020   flag->set_origin(origin);
1021   return check;
1022 }
1023 
1024 Flag::Error CommandLineFlags::boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin) {
1025   Flag* result = Flag::find_flag(name, len);
1026   return boolAtPut(result, value, origin);
1027 }
1028 
1029 Flag::Error CommandLineFlagsEx::boolAtPut(CommandLineFlagWithType flag, bool value, Flag::Flags origin) {
1030   Flag* faddr = address_of_flag(flag);
1031   guarantee(faddr != NULL && faddr->is_bool(), "wrong flag type");
1032   return CommandLineFlags::boolAtPut(faddr, &value, origin);
1033 }
1034 
1035 static Flag::Error apply_constraint_and_check_range_int(const char* name, int new_value, bool verbose) {
1036   Flag::Error status = Flag::SUCCESS;
1037   CommandLineFlagRange* range = CommandLineFlagRangeList::find(name);
1038   if (range != NULL) {
1039     status = range->check_int(new_value, verbose);
1040   }
1041   if (status == Flag::SUCCESS) {
1042     CommandLineFlagConstraint* constraint = CommandLineFlagConstraintList::find_if_needs_check(name);
1043     if (constraint != NULL) {
1044       status = constraint->apply_int(new_value, verbose);
1045     }
1046   }
1047   return status;
1048 }
1049 
1050 Flag::Error CommandLineFlags::intAt(const char* name, size_t len, int* value, bool allow_locked, bool return_flag) {
1051   Flag* result = Flag::find_flag(name, len, allow_locked, return_flag);
1052   if (result == NULL) return Flag::INVALID_FLAG;
1053   if (!result->is_int()) return Flag::WRONG_FORMAT;
1054   *value = result->get_int();
1055   return Flag::SUCCESS;
1056 }
1057 
1058 Flag::Error CommandLineFlags::intAtPut(Flag* flag, int* value, Flag::Flags origin) {
1059   const char* name;
1060   if (flag == NULL) return Flag::INVALID_FLAG;
1061   if (!flag->is_int()) return Flag::WRONG_FORMAT;
1062   name = flag->_name;
1063   Flag::Error check = apply_constraint_and_check_range_int(name, *value, !CommandLineFlagConstraintList::validated_after_ergo());
1064   if (check != Flag::SUCCESS) return check;
1065   int old_value = flag->get_int();
1066   trace_flag_changed<EventIntFlagChanged, s4>(name, old_value, *value, origin);
1067   check = flag->set_int(*value);
1068   *value = old_value;
1069   flag->set_origin(origin);
1070   return check;
1071 }
1072 
1073 Flag::Error CommandLineFlags::intAtPut(const char* name, size_t len, int* value, Flag::Flags origin) {
1074   Flag* result = Flag::find_flag(name, len);
1075   return intAtPut(result, value, origin);
1076 }
1077 
1078 Flag::Error CommandLineFlagsEx::intAtPut(CommandLineFlagWithType flag, int value, Flag::Flags origin) {
1079   Flag* faddr = address_of_flag(flag);
1080   guarantee(faddr != NULL && faddr->is_int(), "wrong flag type");
1081   return CommandLineFlags::intAtPut(faddr, &value, origin);
1082 }
1083 
1084 static Flag::Error apply_constraint_and_check_range_uint(const char* name, uint new_value, bool verbose) {
1085   Flag::Error status = Flag::SUCCESS;
1086   CommandLineFlagRange* range = CommandLineFlagRangeList::find(name);
1087   if (range != NULL) {
1088     status = range->check_uint(new_value, verbose);
1089   }
1090   if (status == Flag::SUCCESS) {
1091     CommandLineFlagConstraint* constraint = CommandLineFlagConstraintList::find_if_needs_check(name);
1092     if (constraint != NULL) {
1093       status = constraint->apply_uint(new_value, verbose);
1094     }
1095   }
1096   return status;
1097 }
1098 
1099 Flag::Error CommandLineFlags::uintAt(const char* name, size_t len, uint* value, bool allow_locked, bool return_flag) {
1100   Flag* result = Flag::find_flag(name, len, allow_locked, return_flag);
1101   if (result == NULL) return Flag::INVALID_FLAG;
1102   if (!result->is_uint()) return Flag::WRONG_FORMAT;
1103   *value = result->get_uint();
1104   return Flag::SUCCESS;
1105 }
1106 
1107 Flag::Error CommandLineFlags::uintAtPut(Flag* flag, uint* value, Flag::Flags origin) {
1108   const char* name;
1109   if (flag == NULL) return Flag::INVALID_FLAG;
1110   if (!flag->is_uint()) return Flag::WRONG_FORMAT;
1111   name = flag->_name;
1112   Flag::Error check = apply_constraint_and_check_range_uint(name, *value, !CommandLineFlagConstraintList::validated_after_ergo());
1113   if (check != Flag::SUCCESS) return check;
1114   uint old_value = flag->get_uint();
1115   trace_flag_changed<EventUnsignedIntFlagChanged, u4>(name, old_value, *value, origin);
1116   check = flag->set_uint(*value);
1117   *value = old_value;
1118   flag->set_origin(origin);
1119   return check;
1120 }
1121 
1122 Flag::Error CommandLineFlags::uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin) {
1123   Flag* result = Flag::find_flag(name, len);
1124   return uintAtPut(result, value, origin);
1125 }
1126 
1127 Flag::Error CommandLineFlagsEx::uintAtPut(CommandLineFlagWithType flag, uint value, Flag::Flags origin) {
1128   Flag* faddr = address_of_flag(flag);
1129   guarantee(faddr != NULL && faddr->is_uint(), "wrong flag type");
1130   return CommandLineFlags::uintAtPut(faddr, &value, origin);
1131 }
1132 
1133 Flag::Error CommandLineFlags::intxAt(const char* name, size_t len, intx* value, bool allow_locked, bool return_flag) {
1134   Flag* result = Flag::find_flag(name, len, allow_locked, return_flag);
1135   if (result == NULL) return Flag::INVALID_FLAG;
1136   if (!result->is_intx()) return Flag::WRONG_FORMAT;
1137   *value = result->get_intx();
1138   return Flag::SUCCESS;
1139 }
1140 
1141 static Flag::Error apply_constraint_and_check_range_intx(const char* name, intx new_value, bool verbose) {
1142   Flag::Error status = Flag::SUCCESS;
1143   CommandLineFlagRange* range = CommandLineFlagRangeList::find(name);
1144   if (range != NULL) {
1145     status = range->check_intx(new_value, verbose);
1146   }
1147   if (status == Flag::SUCCESS) {
1148     CommandLineFlagConstraint* constraint = CommandLineFlagConstraintList::find_if_needs_check(name);
1149     if (constraint != NULL) {
1150       status = constraint->apply_intx(new_value, verbose);
1151     }
1152   }
1153   return status;
1154 }
1155 
1156 Flag::Error CommandLineFlags::intxAtPut(Flag* flag, intx* value, Flag::Flags origin) {
1157   const char* name;
1158   if (flag == NULL) return Flag::INVALID_FLAG;
1159   if (!flag->is_intx()) return Flag::WRONG_FORMAT;
1160   name = flag->_name;
1161   Flag::Error check = apply_constraint_and_check_range_intx(name, *value, !CommandLineFlagConstraintList::validated_after_ergo());
1162   if (check != Flag::SUCCESS) return check;
1163   intx old_value = flag->get_intx();
1164   trace_flag_changed<EventLongFlagChanged, intx>(name, old_value, *value, origin);
1165   check = flag->set_intx(*value);
1166   *value = old_value;
1167   flag->set_origin(origin);
1168   return check;
1169 }
1170 
1171 Flag::Error CommandLineFlags::intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin) {
1172   Flag* result = Flag::find_flag(name, len);
1173   return intxAtPut(result, value, origin);
1174 }
1175 
1176 Flag::Error CommandLineFlagsEx::intxAtPut(CommandLineFlagWithType flag, intx value, Flag::Flags origin) {
1177   Flag* faddr = address_of_flag(flag);
1178   guarantee(faddr != NULL && faddr->is_intx(), "wrong flag type");
1179   return CommandLineFlags::intxAtPut(faddr, &value, origin);
1180 }
1181 
1182 Flag::Error CommandLineFlags::uintxAt(const char* name, size_t len, uintx* value, bool allow_locked, bool return_flag) {
1183   Flag* result = Flag::find_flag(name, len, allow_locked, return_flag);
1184   if (result == NULL) return Flag::INVALID_FLAG;
1185   if (!result->is_uintx()) return Flag::WRONG_FORMAT;
1186   *value = result->get_uintx();
1187   return Flag::SUCCESS;
1188 }
1189 
1190 static Flag::Error apply_constraint_and_check_range_uintx(const char* name, uintx new_value, bool verbose) {
1191   Flag::Error status = Flag::SUCCESS;
1192   CommandLineFlagRange* range = CommandLineFlagRangeList::find(name);
1193   if (range != NULL) {
1194     status = range->check_uintx(new_value, verbose);
1195   }
1196   if (status == Flag::SUCCESS) {
1197     CommandLineFlagConstraint* constraint = CommandLineFlagConstraintList::find_if_needs_check(name);
1198     if (constraint != NULL) {
1199       status = constraint->apply_uintx(new_value, verbose);
1200     }
1201   }
1202   return status;
1203 }
1204 
1205 Flag::Error CommandLineFlags::uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin) {
1206   const char* name;
1207   if (flag == NULL) return Flag::INVALID_FLAG;
1208   if (!flag->is_uintx()) return Flag::WRONG_FORMAT;
1209   name = flag->_name;
1210   Flag::Error check = apply_constraint_and_check_range_uintx(name, *value, !CommandLineFlagConstraintList::validated_after_ergo());
1211   if (check != Flag::SUCCESS) return check;
1212   uintx old_value = flag->get_uintx();
1213   trace_flag_changed<EventUnsignedLongFlagChanged, u8>(name, old_value, *value, origin);
1214   check = flag->set_uintx(*value);
1215   *value = old_value;
1216   flag->set_origin(origin);
1217   return check;
1218 }
1219 
1220 Flag::Error CommandLineFlags::uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin) {
1221   Flag* result = Flag::find_flag(name, len);
1222   return uintxAtPut(result, value, origin);
1223 }
1224 
1225 Flag::Error CommandLineFlagsEx::uintxAtPut(CommandLineFlagWithType flag, uintx value, Flag::Flags origin) {
1226   Flag* faddr = address_of_flag(flag);
1227   guarantee(faddr != NULL && faddr->is_uintx(), "wrong flag type");
1228   return CommandLineFlags::uintxAtPut(faddr, &value, origin);
1229 }
1230 
1231 Flag::Error CommandLineFlags::uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked, bool return_flag) {
1232   Flag* result = Flag::find_flag(name, len, allow_locked, return_flag);
1233   if (result == NULL) return Flag::INVALID_FLAG;
1234   if (!result->is_uint64_t()) return Flag::WRONG_FORMAT;
1235   *value = result->get_uint64_t();
1236   return Flag::SUCCESS;
1237 }
1238 
1239 static Flag::Error apply_constraint_and_check_range_uint64_t(const char* name, uint64_t new_value, bool verbose) {
1240   Flag::Error status = Flag::SUCCESS;
1241   CommandLineFlagRange* range = CommandLineFlagRangeList::find(name);
1242   if (range != NULL) {
1243     status = range->check_uint64_t(new_value, verbose);
1244   }
1245   if (status == Flag::SUCCESS) {
1246     CommandLineFlagConstraint* constraint = CommandLineFlagConstraintList::find_if_needs_check(name);
1247     if (constraint != NULL) {
1248       status = constraint->apply_uint64_t(new_value, verbose);
1249     }
1250   }
1251   return status;
1252 }
1253 
1254 Flag::Error CommandLineFlags::uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin) {
1255   const char* name;
1256   if (flag == NULL) return Flag::INVALID_FLAG;
1257   if (!flag->is_uint64_t()) return Flag::WRONG_FORMAT;
1258   name = flag->_name;
1259   Flag::Error check = apply_constraint_and_check_range_uint64_t(name, *value, !CommandLineFlagConstraintList::validated_after_ergo());
1260   if (check != Flag::SUCCESS) return check;
1261   uint64_t old_value = flag->get_uint64_t();
1262   trace_flag_changed<EventUnsignedLongFlagChanged, u8>(name, old_value, *value, origin);
1263   check = flag->set_uint64_t(*value);
1264   *value = old_value;
1265   flag->set_origin(origin);
1266   return check;
1267 }
1268 
1269 Flag::Error CommandLineFlags::uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin) {
1270   Flag* result = Flag::find_flag(name, len);
1271   return uint64_tAtPut(result, value, origin);
1272 }
1273 
1274 Flag::Error CommandLineFlagsEx::uint64_tAtPut(CommandLineFlagWithType flag, uint64_t value, Flag::Flags origin) {
1275   Flag* faddr = address_of_flag(flag);
1276   guarantee(faddr != NULL && faddr->is_uint64_t(), "wrong flag type");
1277   return CommandLineFlags::uint64_tAtPut(faddr, &value, origin);
1278 }
1279 
1280 Flag::Error CommandLineFlags::size_tAt(const char* name, size_t len, size_t* value, bool allow_locked, bool return_flag) {
1281   Flag* result = Flag::find_flag(name, len, allow_locked, return_flag);
1282   if (result == NULL) return Flag::INVALID_FLAG;
1283   if (!result->is_size_t()) return Flag::WRONG_FORMAT;
1284   *value = result->get_size_t();
1285   return Flag::SUCCESS;
1286 }
1287 
1288 static Flag::Error apply_constraint_and_check_range_size_t(const char* name, size_t new_value, bool verbose) {
1289   Flag::Error status = Flag::SUCCESS;
1290   CommandLineFlagRange* range = CommandLineFlagRangeList::find(name);
1291   if (range != NULL) {
1292     status = range->check_size_t(new_value, verbose);
1293   }
1294   if (status == Flag::SUCCESS) {
1295     CommandLineFlagConstraint* constraint = CommandLineFlagConstraintList::find_if_needs_check(name);
1296     if (constraint != NULL) {
1297       status = constraint->apply_size_t(new_value, verbose);
1298     }
1299   }
1300   return status;
1301 }
1302 
1303 
1304 Flag::Error CommandLineFlags::size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin) {
1305   const char* name;
1306   if (flag == NULL) return Flag::INVALID_FLAG;
1307   if (!flag->is_size_t()) return Flag::WRONG_FORMAT;
1308   name = flag->_name;
1309   Flag::Error check = apply_constraint_and_check_range_size_t(name, *value, !CommandLineFlagConstraintList::validated_after_ergo());
1310   if (check != Flag::SUCCESS) return check;
1311   size_t old_value = flag->get_size_t();
1312   trace_flag_changed<EventUnsignedLongFlagChanged, u8>(name, old_value, *value, origin);
1313   check = flag->set_size_t(*value);
1314   *value = old_value;
1315   flag->set_origin(origin);
1316   return check;
1317 }
1318 
1319 Flag::Error CommandLineFlags::size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin) {
1320   Flag* result = Flag::find_flag(name, len);
1321   return size_tAtPut(result, value, origin);
1322 }
1323 
1324 Flag::Error CommandLineFlagsEx::size_tAtPut(CommandLineFlagWithType flag, size_t value, Flag::Flags origin) {
1325   Flag* faddr = address_of_flag(flag);
1326   guarantee(faddr != NULL && faddr->is_size_t(), "wrong flag type");
1327   return CommandLineFlags::size_tAtPut(faddr, &value, origin);
1328 }
1329 
1330 Flag::Error CommandLineFlags::doubleAt(const char* name, size_t len, double* value, bool allow_locked, bool return_flag) {
1331   Flag* result = Flag::find_flag(name, len, allow_locked, return_flag);
1332   if (result == NULL) return Flag::INVALID_FLAG;
1333   if (!result->is_double()) return Flag::WRONG_FORMAT;
1334   *value = result->get_double();
1335   return Flag::SUCCESS;
1336 }
1337 
1338 static Flag::Error apply_constraint_and_check_range_double(const char* name, double new_value, bool verbose) {
1339   Flag::Error status = Flag::SUCCESS;
1340   CommandLineFlagRange* range = CommandLineFlagRangeList::find(name);
1341   if (range != NULL) {
1342     status = range->check_double(new_value, verbose);
1343   }
1344   if (status == Flag::SUCCESS) {
1345     CommandLineFlagConstraint* constraint = CommandLineFlagConstraintList::find_if_needs_check(name);
1346     if (constraint != NULL) {
1347       status = constraint->apply_double(new_value, verbose);
1348     }
1349   }
1350   return status;
1351 }
1352 
1353 Flag::Error CommandLineFlags::doubleAtPut(Flag* flag, double* value, Flag::Flags origin) {
1354   const char* name;
1355   if (flag == NULL) return Flag::INVALID_FLAG;
1356   if (!flag->is_double()) return Flag::WRONG_FORMAT;
1357   name = flag->_name;
1358   Flag::Error check = apply_constraint_and_check_range_double(name, *value, !CommandLineFlagConstraintList::validated_after_ergo());
1359   if (check != Flag::SUCCESS) return check;
1360   double old_value = flag->get_double();
1361   trace_flag_changed<EventDoubleFlagChanged, double>(name, old_value, *value, origin);
1362   check = flag->set_double(*value);
1363   *value = old_value;
1364   flag->set_origin(origin);
1365   return check;
1366 }
1367 
1368 Flag::Error CommandLineFlags::doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin) {
1369   Flag* result = Flag::find_flag(name, len);
1370   return doubleAtPut(result, value, origin);
1371 }
1372 
1373 Flag::Error CommandLineFlagsEx::doubleAtPut(CommandLineFlagWithType flag, double value, Flag::Flags origin) {
1374   Flag* faddr = address_of_flag(flag);
1375   guarantee(faddr != NULL && faddr->is_double(), "wrong flag type");
1376   return CommandLineFlags::doubleAtPut(faddr, &value, origin);
1377 }
1378 
1379 Flag::Error CommandLineFlags::ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked, bool return_flag) {
1380   Flag* result = Flag::find_flag(name, len, allow_locked, return_flag);
1381   if (result == NULL) return Flag::INVALID_FLAG;
1382   if (!result->is_ccstr()) return Flag::WRONG_FORMAT;
1383   *value = result->get_ccstr();
1384   return Flag::SUCCESS;
1385 }
1386 
1387 Flag::Error CommandLineFlags::ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin) {
1388   Flag* result = Flag::find_flag(name, len);
1389   if (result == NULL) return Flag::INVALID_FLAG;
1390   if (!result->is_ccstr()) return Flag::WRONG_FORMAT;
1391   ccstr old_value = result->get_ccstr();
1392   trace_flag_changed<EventStringFlagChanged, const char*>(name, old_value, *value, origin);
1393   char* new_value = NULL;
1394   if (*value != NULL) {
1395     new_value = os::strdup_check_oom(*value);
1396   }
1397   Flag::Error check = result->set_ccstr(new_value);
1398   if (result->is_default() && old_value != NULL) {
1399     // Prior value is NOT heap allocated, but was a literal constant.
1400     old_value = os::strdup_check_oom(old_value);
1401   }
1402   *value = old_value;
1403   result->set_origin(origin);
1404   return check;
1405 }
1406 
1407 Flag::Error CommandLineFlagsEx::ccstrAtPut(CommandLineFlagWithType flag, ccstr value, Flag::Flags origin) {
1408   Flag* faddr = address_of_flag(flag);
1409   guarantee(faddr != NULL && faddr->is_ccstr(), "wrong flag type");
1410   ccstr old_value = faddr->get_ccstr();
1411   trace_flag_changed<EventStringFlagChanged, const char*>(faddr->_name, old_value, value, origin);
1412   char* new_value = os::strdup_check_oom(value);
1413   Flag::Error check = faddr->set_ccstr(new_value);
1414   if (!faddr->is_default() && old_value != NULL) {
1415     // Prior value is heap allocated so free it.
1416     FREE_C_HEAP_ARRAY(char, old_value);
1417   }
1418   faddr->set_origin(origin);
1419   return check;
1420 }
1421 
1422 extern "C" {
1423   static int compare_flags(const void* void_a, const void* void_b) {
1424     return strcmp((*((Flag**) void_a))->_name, (*((Flag**) void_b))->_name);
1425   }
1426 }
1427 
1428 void CommandLineFlags::printSetFlags(outputStream* out) {
1429   // Print which flags were set on the command line
1430   // note: this method is called before the thread structure is in place
1431   //       which means resource allocation cannot be used.
1432 
1433   // The last entry is the null entry.
1434   const size_t length = Flag::numFlags - 1;
1435 
1436   // Sort
1437   Flag** array = NEW_C_HEAP_ARRAY(Flag*, length, mtArguments);
1438   for (size_t i = 0; i < length; i++) {
1439     array[i] = &flagTable[i];
1440   }
1441   qsort(array, length, sizeof(Flag*), compare_flags);
1442 
1443   // Print
1444   for (size_t i = 0; i < length; i++) {
1445     if (array[i]->get_origin() /* naked field! */) {
1446       array[i]->print_as_flag(out);
1447       out->print(" ");
1448     }
1449   }
1450   out->cr();
1451   FREE_C_HEAP_ARRAY(Flag*, array);
1452 }
1453 
1454 #ifndef PRODUCT
1455 
1456 void CommandLineFlags::verify() {
1457   assert(Arguments::check_vm_args_consistency(), "Some flag settings conflict");
1458 }
1459 
1460 #endif // PRODUCT
1461 
1462 void CommandLineFlags::printFlags(outputStream* out, bool withComments, bool printRanges) {
1463   // Print the flags sorted by name
1464   // note: this method is called before the thread structure is in place
1465   //       which means resource allocation cannot be used.
1466 
1467   // The last entry is the null entry.
1468   const size_t length = Flag::numFlags - 1;
1469 
1470   // Sort
1471   Flag** array = NEW_C_HEAP_ARRAY(Flag*, length, mtArguments);
1472   for (size_t i = 0; i < length; i++) {
1473     array[i] = &flagTable[i];
1474   }
1475   qsort(array, length, sizeof(Flag*), compare_flags);
1476 
1477   // Print
1478   if (!printRanges) {
1479     out->print_cr("[Global flags]");
1480   } else {
1481     out->print_cr("[Global flags ranges]");
1482   }
1483 
1484   for (size_t i = 0; i < length; i++) {
1485     if (array[i]->is_unlocked()) {
1486       array[i]->print_on(out, withComments, printRanges);
1487     }
1488   }
1489   FREE_C_HEAP_ARRAY(Flag*, array);
1490 }