1 /*
   2  * Copyright (c) 1998, 2007, 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 "incls/_precompiled.incl"
  26 #include "incls/_compilerOracle.cpp.incl"
  27 
  28 class MethodMatcher : public CHeapObj {
  29  public:
  30   enum Mode {
  31     Exact,
  32     Prefix = 1,
  33     Suffix = 2,
  34     Substring = Prefix | Suffix,
  35     Any,
  36     Unknown = -1
  37   };
  38 
  39  protected:
  40   jobject        _class_name;
  41   Mode           _class_mode;
  42   jobject        _method_name;
  43   Mode           _method_mode;
  44   jobject        _signature;
  45   MethodMatcher* _next;
  46 
  47   static bool match(symbolHandle candidate, symbolHandle match, Mode match_mode);
  48 
  49   symbolHandle class_name() const { return (symbolOop)JNIHandles::resolve_non_null(_class_name); }
  50   symbolHandle method_name() const { return (symbolOop)JNIHandles::resolve_non_null(_method_name); }
  51   symbolHandle signature() const { return (symbolOop)JNIHandles::resolve(_signature); }
  52 
  53  public:
  54   MethodMatcher(symbolHandle class_name, Mode class_mode,
  55                 symbolHandle method_name, Mode method_mode,
  56                 symbolHandle signature, MethodMatcher* next);
  57   MethodMatcher(symbolHandle class_name, symbolHandle method_name, MethodMatcher* next);
  58 
  59   // utility method
  60   MethodMatcher* find(methodHandle method) {
  61     symbolHandle class_name  = Klass::cast(method->method_holder())->name();
  62     symbolHandle method_name = method->name();
  63     for (MethodMatcher* current = this; current != NULL; current = current->_next) {
  64       if (match(class_name, current->class_name(), current->_class_mode) &&
  65           match(method_name, current->method_name(), current->_method_mode) &&
  66           (current->signature().is_null() || current->signature()() == method->signature())) {
  67         return current;
  68       }
  69     }
  70     return NULL;
  71   }
  72 
  73   bool match(methodHandle method) {
  74     return find(method) != NULL;
  75   }
  76 
  77   MethodMatcher* next() const { return _next; }
  78 
  79   static void print_symbol(symbolHandle h, Mode mode) {
  80     ResourceMark rm;
  81 
  82     if (mode == Suffix || mode == Substring || mode == Any) {
  83       tty->print("*");
  84     }
  85     if (mode != Any) {
  86       h()->print_symbol_on(tty);
  87     }
  88     if (mode == Prefix || mode == Substring) {
  89       tty->print("*");
  90     }
  91   }
  92 
  93   void print_base() {
  94     print_symbol(class_name(), _class_mode);
  95     tty->print(".");
  96     print_symbol(method_name(), _method_mode);
  97     if (!signature().is_null()) {
  98       tty->print(" ");
  99       signature()->print_symbol_on(tty);
 100     }
 101   }
 102 
 103   virtual void print() {
 104     print_base();
 105     tty->cr();
 106   }
 107 };
 108 
 109 MethodMatcher::MethodMatcher(symbolHandle class_name, symbolHandle method_name, MethodMatcher* next) {
 110   _class_name  = JNIHandles::make_global(class_name);
 111   _method_name = JNIHandles::make_global(method_name);
 112   _next        = next;
 113   _class_mode  = MethodMatcher::Exact;
 114   _method_mode = MethodMatcher::Exact;
 115   _signature   = NULL;
 116 }
 117 
 118 
 119 MethodMatcher::MethodMatcher(symbolHandle class_name, Mode class_mode,
 120                              symbolHandle method_name, Mode method_mode,
 121                              symbolHandle signature, MethodMatcher* next):
 122     _class_mode(class_mode)
 123   , _method_mode(method_mode)
 124   , _next(next)
 125   , _class_name(JNIHandles::make_global(class_name()))
 126   , _method_name(JNIHandles::make_global(method_name()))
 127   , _signature(JNIHandles::make_global(signature())) {
 128 }
 129 
 130 bool MethodMatcher::match(symbolHandle candidate, symbolHandle match, Mode match_mode) {
 131   if (match_mode == Any) {
 132     return true;
 133   }
 134 
 135   if (match_mode == Exact) {
 136     return candidate() == match();
 137   }
 138 
 139   ResourceMark rm;
 140   const char * candidate_string = candidate->as_C_string();
 141   const char * match_string = match->as_C_string();
 142 
 143   switch (match_mode) {
 144   case Prefix:
 145     return strstr(candidate_string, match_string) == candidate_string;
 146 
 147   case Suffix: {
 148     size_t clen = strlen(candidate_string);
 149     size_t mlen = strlen(match_string);
 150     return clen >= mlen && strcmp(candidate_string + clen - mlen, match_string) == 0;
 151   }
 152 
 153   case Substring:
 154     return strstr(candidate_string, match_string) != NULL;
 155 
 156   default:
 157     return false;
 158   }
 159 }
 160 
 161 
 162 class MethodOptionMatcher: public MethodMatcher {
 163   const char * option;
 164  public:
 165   MethodOptionMatcher(symbolHandle class_name, Mode class_mode,
 166                              symbolHandle method_name, Mode method_mode,
 167                              symbolHandle signature, const char * opt, MethodMatcher* next):
 168     MethodMatcher(class_name, class_mode, method_name, method_mode, signature, next) {
 169     option = opt;
 170   }
 171 
 172   bool match(methodHandle method, const char* opt) {
 173     MethodOptionMatcher* current = this;
 174     while (current != NULL) {
 175       current = (MethodOptionMatcher*)current->find(method);
 176       if (current == NULL) {
 177         return false;
 178       }
 179       if (strcmp(current->option, opt) == 0) {
 180         return true;
 181       }
 182       current = current->next();
 183     }
 184     return false;
 185   }
 186 
 187   MethodOptionMatcher* next() {
 188     return (MethodOptionMatcher*)_next;
 189   }
 190 
 191   virtual void print() {
 192     print_base();
 193     tty->print(" %s", option);
 194     tty->cr();
 195   }
 196 };
 197 
 198 
 199 
 200 // this must parallel the command_names below
 201 enum OracleCommand {
 202   UnknownCommand = -1,
 203   OracleFirstCommand = 0,
 204   BreakCommand = OracleFirstCommand,
 205   PrintCommand,
 206   ExcludeCommand,
 207   InlineCommand,
 208   DontInlineCommand,
 209   CompileOnlyCommand,
 210   LogCommand,
 211   OptionCommand,
 212   QuietCommand,
 213   HelpCommand,
 214   OracleCommandCount
 215 };
 216 
 217 // this must parallel the enum OracleCommand
 218 static const char * command_names[] = {
 219   "break",
 220   "print",
 221   "exclude",
 222   "inline",
 223   "dontinline",
 224   "compileonly",
 225   "log",
 226   "option",
 227   "quiet",
 228   "help"
 229 };
 230 
 231 static const char * command_name(OracleCommand command) {
 232   if (command < OracleFirstCommand || command >= OracleCommandCount) {
 233     return "unknown command";
 234   }
 235   return command_names[command];
 236 }
 237 
 238 class MethodMatcher;
 239 static MethodMatcher* lists[OracleCommandCount] = { 0, };
 240 
 241 
 242 static bool check_predicate(OracleCommand command, methodHandle method) {
 243   return ((lists[command] != NULL) &&
 244           !method.is_null() &&
 245           lists[command]->match(method));
 246 }
 247 
 248 
 249 static MethodMatcher* add_predicate(OracleCommand command,
 250                                     symbolHandle class_name, MethodMatcher::Mode c_mode,
 251                                     symbolHandle method_name, MethodMatcher::Mode m_mode,
 252                                     symbolHandle signature) {
 253   assert(command != OptionCommand, "must use add_option_string");
 254   if (command == LogCommand && !LogCompilation && lists[LogCommand] == NULL)
 255     tty->print_cr("Warning:  +LogCompilation must be enabled in order for individual methods to be logged.");
 256   lists[command] = new MethodMatcher(class_name, c_mode, method_name, m_mode, signature, lists[command]);
 257   return lists[command];
 258 }
 259 
 260 
 261 
 262 static MethodMatcher* add_option_string(symbolHandle class_name, MethodMatcher::Mode c_mode,
 263                                         symbolHandle method_name, MethodMatcher::Mode m_mode,
 264                                         symbolHandle signature,
 265                                         const char* option) {
 266   lists[OptionCommand] = new MethodOptionMatcher(class_name, c_mode, method_name, m_mode,
 267                                                  signature, option, lists[OptionCommand]);
 268   return lists[OptionCommand];
 269 }
 270 
 271 
 272 bool CompilerOracle::has_option_string(methodHandle method, const char* option) {
 273   return lists[OptionCommand] != NULL &&
 274     ((MethodOptionMatcher*)lists[OptionCommand])->match(method, option);
 275 }
 276 
 277 
 278 bool CompilerOracle::should_exclude(methodHandle method, bool& quietly) {
 279   quietly = true;
 280   if (lists[ExcludeCommand] != NULL) {
 281     if (lists[ExcludeCommand]->match(method)) {
 282       quietly = _quiet;
 283       return true;
 284     }
 285   }
 286 
 287   if (lists[CompileOnlyCommand] != NULL) {
 288     return !lists[CompileOnlyCommand]->match(method);
 289   }
 290   return false;
 291 }
 292 
 293 
 294 bool CompilerOracle::should_inline(methodHandle method) {
 295   return (check_predicate(InlineCommand, method));
 296 }
 297 
 298 
 299 bool CompilerOracle::should_not_inline(methodHandle method) {
 300   return (check_predicate(DontInlineCommand, method));
 301 }
 302 
 303 
 304 bool CompilerOracle::should_print(methodHandle method) {
 305   return (check_predicate(PrintCommand, method));
 306 }
 307 
 308 
 309 bool CompilerOracle::should_log(methodHandle method) {
 310   if (!LogCompilation)            return false;
 311   if (lists[LogCommand] == NULL)  return true;  // by default, log all
 312   return (check_predicate(LogCommand, method));
 313 }
 314 
 315 
 316 bool CompilerOracle::should_break_at(methodHandle method) {
 317   return check_predicate(BreakCommand, method);
 318 }
 319 
 320 
 321 static OracleCommand parse_command_name(const char * line, int* bytes_read) {
 322   assert(ARRAY_SIZE(command_names) == OracleCommandCount,
 323          "command_names size mismatch");
 324 
 325   *bytes_read = 0;
 326   char command[32];
 327   int result = sscanf(line, "%32[a-z]%n", command, bytes_read);
 328   for (uint i = 0; i < ARRAY_SIZE(command_names); i++) {
 329     if (strcmp(command, command_names[i]) == 0) {
 330       return (OracleCommand)i;
 331     }
 332   }
 333   return UnknownCommand;
 334 }
 335 
 336 
 337 static void usage() {
 338   tty->print_cr("  CompileCommand and the CompilerOracle allows simple control over");
 339   tty->print_cr("  what's allowed to be compiled.  The standard supported directives");
 340   tty->print_cr("  are exclude and compileonly.  The exclude directive stops a method");
 341   tty->print_cr("  from being compiled and compileonly excludes all methods except for");
 342   tty->print_cr("  the ones mentioned by compileonly directives.  The basic form of");
 343   tty->print_cr("  all commands is a command name followed by the name of the method");
 344   tty->print_cr("  in one of two forms: the standard class file format as in");
 345   tty->print_cr("  class/name.methodName or the PrintCompilation format");
 346   tty->print_cr("  class.name::methodName.  The method name can optionally be followed");
 347   tty->print_cr("  by a space then the signature of the method in the class file");
 348   tty->print_cr("  format.  Otherwise the directive applies to all methods with the");
 349   tty->print_cr("  same name and class regardless of signature.  Leading and trailing");
 350   tty->print_cr("  *'s in the class and/or method name allows a small amount of");
 351   tty->print_cr("  wildcarding.  ");
 352   tty->cr();
 353   tty->print_cr("  Examples:");
 354   tty->cr();
 355   tty->print_cr("  exclude java/lang/StringBuffer.append");
 356   tty->print_cr("  compileonly java/lang/StringBuffer.toString ()Ljava/lang/String;");
 357   tty->print_cr("  exclude java/lang/String*.*");
 358   tty->print_cr("  exclude *.toString");
 359 }
 360 
 361 
 362 // The characters allowed in a class or method name.  All characters > 0x7f
 363 // are allowed in order to handle obfuscated class files (e.g. Volano)
 364 #define RANGEBASE "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789$_<>" \
 365         "\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f" \
 366         "\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f" \
 367         "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf" \
 368         "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf" \
 369         "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf" \
 370         "\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf" \
 371         "\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef" \
 372         "\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff"
 373 
 374 #define RANGE0 "[*" RANGEBASE "]"
 375 #define RANGEDOT "[*" RANGEBASE ".]"
 376 #define RANGESLASH "[*" RANGEBASE "/]"
 377 
 378 
 379 // Accept several syntaxes for these patterns
 380 //  original syntax
 381 //   cmd  java.lang.String foo
 382 //  PrintCompilation syntax
 383 //   cmd  java.lang.String::foo
 384 //  VM syntax
 385 //   cmd  java/lang/String[. ]foo
 386 //
 387 
 388 static const char* patterns[] = {
 389   "%*[ \t]%255" RANGEDOT    " "     "%255"  RANGE0 "%n",
 390   "%*[ \t]%255" RANGEDOT   "::"     "%255"  RANGE0 "%n",
 391   "%*[ \t]%255" RANGESLASH "%*[ .]" "%255"  RANGE0 "%n",
 392 };
 393 
 394 static MethodMatcher::Mode check_mode(char name[], const char*& error_msg) {
 395   int match = MethodMatcher::Exact;
 396   while (name[0] == '*') {
 397     match |= MethodMatcher::Suffix;
 398     strcpy(name, name + 1);
 399   }
 400 
 401   if (strcmp(name, "*") == 0) return MethodMatcher::Any;
 402 
 403   size_t len = strlen(name);
 404   while (len > 0 && name[len - 1] == '*') {
 405     match |= MethodMatcher::Prefix;
 406     name[--len] = '\0';
 407   }
 408 
 409   if (strstr(name, "*") != NULL) {
 410     error_msg = "  Embedded * not allowed";
 411     return MethodMatcher::Unknown;
 412   }
 413   return (MethodMatcher::Mode)match;
 414 }
 415 
 416 static bool scan_line(const char * line,
 417                       char class_name[],  MethodMatcher::Mode* c_mode,
 418                       char method_name[], MethodMatcher::Mode* m_mode,
 419                       int* bytes_read, const char*& error_msg) {
 420   *bytes_read = 0;
 421   error_msg = NULL;
 422   for (uint i = 0; i < ARRAY_SIZE(patterns); i++) {
 423     if (2 == sscanf(line, patterns[i], class_name, method_name, bytes_read)) {
 424       *c_mode = check_mode(class_name, error_msg);
 425       *m_mode = check_mode(method_name, error_msg);
 426       return *c_mode != MethodMatcher::Unknown && *m_mode != MethodMatcher::Unknown;
 427     }
 428   }
 429   return false;
 430 }
 431 
 432 
 433 
 434 void CompilerOracle::parse_from_line(char* line) {
 435   if (line[0] == '\0') return;
 436   if (line[0] == '#')  return;
 437 
 438   bool have_colon = (strstr(line, "::") != NULL);
 439   for (char* lp = line; *lp != '\0'; lp++) {
 440     // Allow '.' to separate the class name from the method name.
 441     // This is the preferred spelling of methods:
 442     //      exclude java/lang/String.indexOf(I)I
 443     // Allow ',' for spaces (eases command line quoting).
 444     //      exclude,java/lang/String.indexOf
 445     // For backward compatibility, allow space as separator also.
 446     //      exclude java/lang/String indexOf
 447     //      exclude,java/lang/String,indexOf
 448     // For easy cut-and-paste of method names, allow VM output format
 449     // as produced by methodOopDesc::print_short_name:
 450     //      exclude java.lang.String::indexOf
 451     // For simple implementation convenience here, convert them all to space.
 452     if (have_colon) {
 453       if (*lp == '.')  *lp = '/';   // dots build the package prefix
 454       if (*lp == ':')  *lp = ' ';
 455     }
 456     if (*lp == ',' || *lp == '.')  *lp = ' ';
 457   }
 458 
 459   char* original_line = line;
 460   int bytes_read;
 461   OracleCommand command = parse_command_name(line, &bytes_read);
 462   line += bytes_read;
 463 
 464   if (command == QuietCommand) {
 465     _quiet = true;
 466     return;
 467   }
 468 
 469   if (command == HelpCommand) {
 470     usage();
 471     return;
 472   }
 473 
 474   MethodMatcher::Mode c_match = MethodMatcher::Exact;
 475   MethodMatcher::Mode m_match = MethodMatcher::Exact;
 476   char class_name[256];
 477   char method_name[256];
 478   char sig[1024];
 479   char errorbuf[1024];
 480   const char* error_msg = NULL;
 481   MethodMatcher* match = NULL;
 482 
 483   if (scan_line(line, class_name, &c_match, method_name, &m_match, &bytes_read, error_msg)) {
 484     EXCEPTION_MARK;
 485     symbolHandle c_name = oopFactory::new_symbol_handle(class_name, CHECK);
 486     symbolHandle m_name = oopFactory::new_symbol_handle(method_name, CHECK);
 487     symbolHandle signature;
 488 
 489     line += bytes_read;
 490     // there might be a signature following the method.
 491     // signatures always begin with ( so match that by hand
 492     if (1 == sscanf(line, "%*[ \t](%254[);/" RANGEBASE "]%n", sig + 1, &bytes_read)) {
 493       sig[0] = '(';
 494       line += bytes_read;
 495       signature = oopFactory::new_symbol_handle(sig, CHECK);
 496     }
 497 
 498     if (command == OptionCommand) {
 499       // Look for trailing options to support
 500       // ciMethod::has_option("string") to control features in the
 501       // compiler.  Multiple options may follow the method name.
 502       char option[256];
 503       while (sscanf(line, "%*[ \t]%255[a-zA-Z0-9]%n", option, &bytes_read) == 1) {
 504         if (match != NULL && !_quiet) {
 505           // Print out the last match added
 506           tty->print("CompilerOracle: %s ", command_names[command]);
 507           match->print();
 508         }
 509         match = add_option_string(c_name, c_match, m_name, m_match, signature, strdup(option));
 510         line += bytes_read;
 511       }
 512     } else {
 513       bytes_read = 0;
 514       sscanf(line, "%*[ \t]%n", &bytes_read);
 515       if (line[bytes_read] != '\0') {
 516         jio_snprintf(errorbuf, sizeof(errorbuf), "  Unrecognized text after command: %s", line);
 517         error_msg = errorbuf;
 518       } else {
 519         match = add_predicate(command, c_name, c_match, m_name, m_match, signature);
 520       }
 521     }
 522   }
 523 
 524   if (match != NULL) {
 525     if (!_quiet) {
 526       tty->print("CompilerOracle: %s ", command_names[command]);
 527       match->print();
 528     }
 529   } else {
 530     tty->print_cr("CompilerOracle: unrecognized line");
 531     tty->print_cr("  \"%s\"", original_line);
 532     if (error_msg != NULL) {
 533       tty->print_cr(error_msg);
 534     }
 535   }
 536 }
 537 
 538 static const char* cc_file() {
 539   if (CompileCommandFile == NULL)
 540     return ".hotspot_compiler";
 541   return CompileCommandFile;
 542 }
 543 bool CompilerOracle::_quiet = false;
 544 
 545 void CompilerOracle::parse_from_file() {
 546   FILE* stream = fopen(cc_file(), "rt");
 547   if (stream == NULL) return;
 548 
 549   char token[1024];
 550   int  pos = 0;
 551   int  c = getc(stream);
 552   while(c != EOF) {
 553     if (c == '\n') {
 554       token[pos++] = '\0';
 555       parse_from_line(token);
 556       pos = 0;
 557     } else {
 558       token[pos++] = c;
 559     }
 560     c = getc(stream);
 561   }
 562   token[pos++] = '\0';
 563   parse_from_line(token);
 564 
 565   fclose(stream);
 566 }
 567 
 568 void CompilerOracle::parse_from_string(const char* str, void (*parse_line)(char*)) {
 569   char token[1024];
 570   int  pos = 0;
 571   const char* sp = str;
 572   int  c = *sp++;
 573   while (c != '\0') {
 574     if (c == '\n') {
 575       token[pos++] = '\0';
 576       parse_line(token);
 577       pos = 0;
 578     } else {
 579       token[pos++] = c;
 580     }
 581     c = *sp++;
 582   }
 583   token[pos++] = '\0';
 584   parse_line(token);
 585 }
 586 
 587 void CompilerOracle::append_comment_to_file(const char* message) {
 588   fileStream stream(fopen(cc_file(), "at"));
 589   stream.print("# ");
 590   for (int index = 0; message[index] != '\0'; index++) {
 591     stream.put(message[index]);
 592     if (message[index] == '\n') stream.print("# ");
 593   }
 594   stream.cr();
 595 }
 596 
 597 void CompilerOracle::append_exclude_to_file(methodHandle method) {
 598   fileStream stream(fopen(cc_file(), "at"));
 599   stream.print("exclude ");
 600   Klass::cast(method->method_holder())->name()->print_symbol_on(&stream);
 601   stream.print(".");
 602   method->name()->print_symbol_on(&stream);
 603   method->signature()->print_symbol_on(&stream);
 604   stream.cr();
 605   stream.cr();
 606 }
 607 
 608 
 609 void compilerOracle_init() {
 610   CompilerOracle::parse_from_string(CompileCommand, CompilerOracle::parse_from_line);
 611   CompilerOracle::parse_from_string(CompileOnly, CompilerOracle::parse_compile_only);
 612   CompilerOracle::parse_from_file();
 613   if (lists[PrintCommand] != NULL) {
 614     if (PrintAssembly) {
 615       warning("CompileCommand and/or .hotspot_compiler file contains 'print' commands, but PrintAssembly is also enabled");
 616     } else if (FLAG_IS_DEFAULT(DebugNonSafepoints)) {
 617       warning("printing of assembly code is enabled; turning on DebugNonSafepoints to gain additional output");
 618       DebugNonSafepoints = true;
 619     }
 620   }
 621 }
 622 
 623 
 624 void CompilerOracle::parse_compile_only(char * line) {
 625   int i;
 626   char name[1024];
 627   const char* className = NULL;
 628   const char* methodName = NULL;
 629 
 630   bool have_colon = (strstr(line, "::") != NULL);
 631   char method_sep = have_colon ? ':' : '.';
 632 
 633   if (Verbose) {
 634     tty->print_cr(line);
 635   }
 636 
 637   ResourceMark rm;
 638   while (*line != '\0') {
 639     MethodMatcher::Mode c_match = MethodMatcher::Exact;
 640     MethodMatcher::Mode m_match = MethodMatcher::Exact;
 641 
 642     for (i = 0;
 643          i < 1024 && *line != '\0' && *line != method_sep && *line != ',' && !isspace(*line);
 644          line++, i++) {
 645       name[i] = *line;
 646       if (name[i] == '.')  name[i] = '/';  // package prefix uses '/'
 647     }
 648 
 649     if (i > 0) {
 650       char* newName = NEW_RESOURCE_ARRAY( char, i + 1);
 651       if (newName == NULL)
 652         return;
 653       strncpy(newName, name, i);
 654       newName[i] = '\0';
 655 
 656       if (className == NULL) {
 657         className = newName;
 658         c_match = MethodMatcher::Prefix;
 659       } else {
 660         methodName = newName;
 661       }
 662     }
 663 
 664     if (*line == method_sep) {
 665       if (className == NULL) {
 666         className = "";
 667         c_match = MethodMatcher::Any;
 668       } else {
 669         // foo/bar.blah is an exact match on foo/bar, bar.blah is a suffix match on bar
 670         if (strchr(className, '/') != NULL) {
 671           c_match = MethodMatcher::Exact;
 672         } else {
 673           c_match = MethodMatcher::Suffix;
 674         }
 675       }
 676     } else {
 677       // got foo or foo/bar
 678       if (className == NULL) {
 679         ShouldNotReachHere();
 680       } else {
 681         // got foo or foo/bar
 682         if (strchr(className, '/') != NULL) {
 683           c_match = MethodMatcher::Prefix;
 684         } else if (className[0] == '\0') {
 685           c_match = MethodMatcher::Any;
 686         } else {
 687           c_match = MethodMatcher::Substring;
 688         }
 689       }
 690     }
 691 
 692     // each directive is terminated by , or NUL or . followed by NUL
 693     if (*line == ',' || *line == '\0' || (line[0] == '.' && line[1] == '\0')) {
 694       if (methodName == NULL) {
 695         methodName = "";
 696         if (*line != method_sep) {
 697           m_match = MethodMatcher::Any;
 698         }
 699       }
 700 
 701       EXCEPTION_MARK;
 702       symbolHandle c_name = oopFactory::new_symbol_handle(className, CHECK);
 703       symbolHandle m_name = oopFactory::new_symbol_handle(methodName, CHECK);
 704       symbolHandle signature;
 705 
 706       add_predicate(CompileOnlyCommand, c_name, c_match, m_name, m_match, signature);
 707       if (PrintVMOptions) {
 708         tty->print("CompileOnly: compileonly ");
 709         lists[CompileOnlyCommand]->print();
 710       }
 711 
 712       className = NULL;
 713       methodName = NULL;
 714     }
 715 
 716     line = *line == '\0' ? line : line + 1;
 717   }
 718 }