1 /*
   2  * Copyright (c) 1999, 2012, 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 "c1/c1_CFGPrinter.hpp"
  27 #include "c1/c1_Compilation.hpp"
  28 #include "c1/c1_IR.hpp"
  29 #include "c1/c1_LIRAssembler.hpp"
  30 #include "c1/c1_LinearScan.hpp"
  31 #include "c1/c1_MacroAssembler.hpp"
  32 #include "c1/c1_ValueMap.hpp"
  33 #include "c1/c1_ValueStack.hpp"
  34 #include "code/debugInfoRec.hpp"
  35 #include "compiler/compileLog.hpp"
  36 #include "c1/c1_RangeCheckElimination.hpp"
  37 
  38 
  39 typedef enum {
  40   _t_compile,
  41   _t_setup,
  42   _t_buildIR,
  43   _t_optimize_blocks,
  44   _t_optimize_null_checks,
  45   _t_rangeCheckElimination,
  46   _t_emit_lir,
  47   _t_linearScan,
  48   _t_lirGeneration,
  49   _t_lir_schedule,
  50   _t_codeemit,
  51   _t_codeinstall,
  52   max_phase_timers
  53 } TimerName;
  54 
  55 static const char * timer_name[] = {
  56   "compile",
  57   "setup",
  58   "optimize_blocks",
  59   "optimize_null_checks",
  60   "rangeCheckElimination",
  61   "buildIR",
  62   "emit_lir",
  63   "linearScan",
  64   "lirGeneration",
  65   "lir_schedule",
  66   "codeemit",
  67   "codeinstall"
  68 };
  69 
  70 static elapsedTimer timers[max_phase_timers];
  71 static int totalInstructionNodes = 0;
  72 
  73 class PhaseTraceTime: public TraceTime {
  74  private:
  75   JavaThread* _thread;
  76   CompileLog* _log;
  77 
  78  public:
  79   PhaseTraceTime(TimerName timer)
  80   : TraceTime("", &timers[timer], CITime || CITimeEach, Verbose), _log(NULL) {
  81     if (Compilation::current() != NULL) {
  82       _log = Compilation::current()->log();
  83     }
  84 
  85     if (_log != NULL) {
  86       _log->begin_head("phase name='%s'", timer_name[timer]);
  87       _log->stamp();
  88       _log->end_head();
  89     }
  90   }
  91 
  92   ~PhaseTraceTime() {
  93     if (_log != NULL)
  94       _log->done("phase");
  95   }
  96 };
  97 
  98 // Implementation of Compilation
  99 
 100 
 101 #ifndef PRODUCT
 102 
 103 void Compilation::maybe_print_current_instruction() {
 104   if (_current_instruction != NULL && _last_instruction_printed != _current_instruction) {
 105     _last_instruction_printed = _current_instruction;
 106     _current_instruction->print_line();
 107   }
 108 }
 109 #endif // PRODUCT
 110 
 111 
 112 DebugInformationRecorder* Compilation::debug_info_recorder() const {
 113   return _env->debug_info();
 114 }
 115 
 116 
 117 Dependencies* Compilation::dependency_recorder() const {
 118   return _env->dependencies();
 119 }
 120 
 121 
 122 void Compilation::initialize() {
 123   // Use an oop recorder bound to the CI environment.
 124   // (The default oop recorder is ignorant of the CI.)
 125   OopRecorder* ooprec = new OopRecorder(_env->arena());
 126   _env->set_oop_recorder(ooprec);
 127   _env->set_debug_info(new DebugInformationRecorder(ooprec));
 128   debug_info_recorder()->set_oopmaps(new OopMapSet());
 129   _env->set_dependencies(new Dependencies(_env));
 130 }
 131 
 132 
 133 void Compilation::build_hir() {
 134   CHECK_BAILOUT();
 135 
 136   // setup ir
 137   CompileLog* log = this->log();
 138   if (log != NULL) {
 139     log->begin_head("parse method='%d' ",
 140                     log->identify(_method));
 141     log->stamp();
 142     log->end_head();
 143   }
 144   _hir = new IR(this, method(), osr_bci());
 145   if (log)  log->done("parse");
 146   if (!_hir->is_valid()) {
 147     bailout("invalid parsing");
 148     return;
 149   }
 150 
 151 #ifndef PRODUCT
 152   if (PrintCFGToFile) {
 153     CFGPrinter::print_cfg(_hir, "After Generation of HIR", true, false);
 154   }
 155 #endif
 156 
 157 #ifndef PRODUCT
 158   if (PrintCFG || PrintCFG0) { tty->print_cr("CFG after parsing"); _hir->print(true); }
 159   if (PrintIR  || PrintIR0 ) { tty->print_cr("IR after parsing"); _hir->print(false); }
 160 #endif
 161 
 162   _hir->verify();
 163 
 164   if (UseC1Optimizations) {
 165     NEEDS_CLEANUP
 166     // optimization
 167     PhaseTraceTime timeit(_t_optimize_blocks);
 168 
 169     _hir->optimize_blocks();
 170   }
 171 
 172   _hir->verify();
 173 
 174   _hir->split_critical_edges();
 175 
 176 #ifndef PRODUCT
 177   if (PrintCFG || PrintCFG1) { tty->print_cr("CFG after optimizations"); _hir->print(true); }
 178   if (PrintIR  || PrintIR1 ) { tty->print_cr("IR after optimizations"); _hir->print(false); }
 179 #endif
 180 
 181   _hir->verify();
 182 
 183   // compute block ordering for code generation
 184   // the control flow must not be changed from here on
 185   _hir->compute_code();
 186 
 187   if (UseGlobalValueNumbering) {
 188     // No resource mark here! LoopInvariantCodeMotion can allocate ValueStack objects.
 189     int instructions = Instruction::number_of_instructions();
 190     GlobalValueNumbering gvn(_hir);
 191     assert(instructions == Instruction::number_of_instructions(),
 192            "shouldn't have created an instructions");
 193   }
 194 
 195   _hir->verify();
 196 
 197 #ifndef PRODUCT
 198 
 199   if (PrintCFGToFile) {
 200     CFGPrinter::print_cfg(_hir, "Before RangeCheckElimination", true, false);
 201   }
 202 
 203 #endif
 204 
 205   if (RangeCheckElimination) {
 206     if (_hir->osr_entry() == NULL) {
 207       PhaseTraceTime timeit(_t_rangeCheckElimination);
 208       RangeCheckElimination::eliminate(_hir);
 209     }
 210   }
 211 
 212 #ifndef PRODUCT
 213   if (PrintCFGToFile) {
 214     CFGPrinter::print_cfg(_hir, "After RangeCheckElimination", true, false);
 215   }
 216 #endif
 217 
 218   if (UseC1Optimizations) {
 219     // loop invariant code motion reorders instructions and range
 220     // check elimination adds new instructions so do null check
 221     // elimination after.
 222     NEEDS_CLEANUP
 223     // optimization
 224     PhaseTraceTime timeit(_t_optimize_null_checks);
 225 
 226     _hir->eliminate_null_checks();
 227   }
 228 
 229   _hir->verify();
 230 
 231   // compute use counts after global value numbering
 232   _hir->compute_use_counts();
 233 
 234 #ifndef PRODUCT
 235   if (PrintCFG || PrintCFG2) { tty->print_cr("CFG before code generation"); _hir->code()->print(true); }
 236   if (PrintIR  || PrintIR2 ) { tty->print_cr("IR before code generation"); _hir->code()->print(false, true); }
 237 #endif
 238 
 239   _hir->verify();
 240 }
 241 
 242 
 243 void Compilation::emit_lir() {
 244   CHECK_BAILOUT();
 245 
 246   LIRGenerator gen(this, method());
 247   {
 248     PhaseTraceTime timeit(_t_lirGeneration);
 249     hir()->iterate_linear_scan_order(&gen);
 250   }
 251 
 252   CHECK_BAILOUT();
 253 
 254   {
 255     PhaseTraceTime timeit(_t_linearScan);
 256 
 257     LinearScan* allocator = new LinearScan(hir(), &gen, frame_map());
 258     set_allocator(allocator);
 259     // Assign physical registers to LIR operands using a linear scan algorithm.
 260     allocator->do_linear_scan();
 261     CHECK_BAILOUT();
 262 
 263     _max_spills = allocator->max_spills();
 264   }
 265 
 266   if (BailoutAfterLIR) {
 267     if (PrintLIR && !bailed_out()) {
 268       print_LIR(hir()->code());
 269     }
 270     bailout("Bailing out because of -XX:+BailoutAfterLIR");
 271   }
 272 }
 273 
 274 
 275 void Compilation::emit_code_epilog(LIR_Assembler* assembler) {
 276   CHECK_BAILOUT();
 277 
 278   CodeOffsets* code_offsets = assembler->offsets();
 279 
 280   // generate code or slow cases
 281   assembler->emit_slow_case_stubs();
 282   CHECK_BAILOUT();
 283 
 284   // generate exception adapters
 285   assembler->emit_exception_entries(exception_info_list());
 286   CHECK_BAILOUT();
 287 
 288   // Generate code for exception handler.
 289   code_offsets->set_value(CodeOffsets::Exceptions, assembler->emit_exception_handler());
 290   CHECK_BAILOUT();
 291 
 292   // Generate code for deopt handler.
 293   code_offsets->set_value(CodeOffsets::Deopt, assembler->emit_deopt_handler());
 294   CHECK_BAILOUT();
 295 
 296   // Emit the MethodHandle deopt handler code (if required).
 297   if (has_method_handle_invokes()) {
 298     // We can use the same code as for the normal deopt handler, we
 299     // just need a different entry point address.
 300     code_offsets->set_value(CodeOffsets::DeoptMH, assembler->emit_deopt_handler());
 301     CHECK_BAILOUT();
 302   }
 303 
 304   // Emit the handler to remove the activation from the stack and
 305   // dispatch to the caller.
 306   offsets()->set_value(CodeOffsets::UnwindHandler, assembler->emit_unwind_handler());
 307 
 308   // done
 309   masm()->flush();
 310 }
 311 
 312 
 313 bool Compilation::setup_code_buffer(CodeBuffer* code, int call_stub_estimate) {
 314   // Preinitialize the consts section to some large size:
 315   int locs_buffer_size = 20 * (relocInfo::length_limit + sizeof(relocInfo));
 316   char* locs_buffer = NEW_RESOURCE_ARRAY(char, locs_buffer_size);
 317   code->insts()->initialize_shared_locs((relocInfo*)locs_buffer,
 318                                         locs_buffer_size / sizeof(relocInfo));
 319   code->initialize_consts_size(Compilation::desired_max_constant_size());
 320   // Call stubs + two deopt handlers (regular and MH) + exception handler
 321   int stub_size = (call_stub_estimate * LIR_Assembler::call_stub_size) +
 322                    LIR_Assembler::exception_handler_size +
 323                    (2 * LIR_Assembler::deopt_handler_size);
 324   if (stub_size >= code->insts_capacity()) return false;
 325   code->initialize_stubs_size(stub_size);
 326   return true;
 327 }
 328 
 329 
 330 int Compilation::emit_code_body() {
 331   // emit code
 332   if (!setup_code_buffer(code(), allocator()->num_calls())) {
 333     BAILOUT_("size requested greater than avail code buffer size", 0);
 334   }
 335   code()->initialize_oop_recorder(env()->oop_recorder());
 336 
 337   _masm = new C1_MacroAssembler(code());
 338   _masm->set_oop_recorder(env()->oop_recorder());
 339 
 340   LIR_Assembler lir_asm(this);
 341 
 342   lir_asm.emit_code(hir()->code());
 343   CHECK_BAILOUT_(0);
 344 
 345   emit_code_epilog(&lir_asm);
 346   CHECK_BAILOUT_(0);
 347 
 348   generate_exception_handler_table();
 349 
 350 #ifndef PRODUCT
 351   if (PrintExceptionHandlers && Verbose) {
 352     exception_handler_table()->print();
 353   }
 354 #endif /* PRODUCT */
 355 
 356   return frame_map()->framesize();
 357 }
 358 
 359 
 360 int Compilation::compile_java_method() {
 361   assert(!method()->is_native(), "should not reach here");
 362 
 363   if (BailoutOnExceptionHandlers) {
 364     if (method()->has_exception_handlers()) {
 365       bailout("linear scan can't handle exception handlers");
 366     }
 367   }
 368 
 369   CHECK_BAILOUT_(no_frame_size);
 370 
 371   if (is_profiling() && !method()->ensure_method_data()) {
 372     BAILOUT_("mdo allocation failed", no_frame_size);
 373   }
 374 
 375   {
 376     PhaseTraceTime timeit(_t_buildIR);
 377     build_hir();
 378   }
 379   if (BailoutAfterHIR) {
 380     BAILOUT_("Bailing out because of -XX:+BailoutAfterHIR", no_frame_size);
 381   }
 382 
 383 
 384   {
 385     PhaseTraceTime timeit(_t_emit_lir);
 386 
 387     _frame_map = new FrameMap(method(), hir()->number_of_locks(), MAX2(4, hir()->max_stack()));
 388     emit_lir();
 389   }
 390   CHECK_BAILOUT_(no_frame_size);
 391 
 392   {
 393     PhaseTraceTime timeit(_t_codeemit);
 394     return emit_code_body();
 395   }
 396 }
 397 
 398 void Compilation::install_code(int frame_size) {
 399   // frame_size is in 32-bit words so adjust it intptr_t words
 400   assert(frame_size == frame_map()->framesize(), "must match");
 401   assert(in_bytes(frame_map()->framesize_in_bytes()) % sizeof(intptr_t) == 0, "must be at least pointer aligned");
 402   _env->register_method(
 403     method(),
 404     osr_bci(),
 405     &_offsets,
 406     in_bytes(_frame_map->sp_offset_for_orig_pc()),
 407     code(),
 408     in_bytes(frame_map()->framesize_in_bytes()) / sizeof(intptr_t),
 409     debug_info_recorder()->_oopmaps,
 410     exception_handler_table(),
 411     implicit_exception_table(),
 412     compiler(),
 413     _env->comp_level(),
 414     has_unsafe_access(),
 415     SharedRuntime::is_wide_vector(max_vector_size())
 416   );
 417 }
 418 
 419 
 420 void Compilation::compile_method() {
 421   // setup compilation
 422   initialize();
 423 
 424   if (!method()->can_be_compiled()) {
 425     // Prevent race condition 6328518.
 426     // This can happen if the method is obsolete or breakpointed.
 427     bailout("Bailing out because method is not compilable");
 428     return;
 429   }
 430 
 431   if (_env->jvmti_can_hotswap_or_post_breakpoint()) {
 432     // We can assert evol_method because method->can_be_compiled is true.
 433     dependency_recorder()->assert_evol_method(method());
 434   }
 435 
 436   if (method()->break_at_execute()) {
 437     BREAKPOINT;
 438   }
 439 
 440 #ifndef PRODUCT
 441   if (PrintCFGToFile) {
 442     CFGPrinter::print_compilation(this);
 443   }
 444 #endif
 445 
 446   // compile method
 447   int frame_size = compile_java_method();
 448 
 449   // bailout if method couldn't be compiled
 450   // Note: make sure we mark the method as not compilable!
 451   CHECK_BAILOUT();
 452 
 453   if (InstallMethods) {
 454     // install code
 455     PhaseTraceTime timeit(_t_codeinstall);
 456     install_code(frame_size);
 457   }
 458 
 459   if (log() != NULL) // Print code cache state into compiler log
 460     log()->code_cache_state();
 461 
 462   totalInstructionNodes += Instruction::number_of_instructions();
 463 }
 464 
 465 
 466 void Compilation::generate_exception_handler_table() {
 467   // Generate an ExceptionHandlerTable from the exception handler
 468   // information accumulated during the compilation.
 469   ExceptionInfoList* info_list = exception_info_list();
 470 
 471   if (info_list->length() == 0) {
 472     return;
 473   }
 474 
 475   // allocate some arrays for use by the collection code.
 476   const int num_handlers = 5;
 477   GrowableArray<intptr_t>* bcis = new GrowableArray<intptr_t>(num_handlers);
 478   GrowableArray<intptr_t>* scope_depths = new GrowableArray<intptr_t>(num_handlers);
 479   GrowableArray<intptr_t>* pcos = new GrowableArray<intptr_t>(num_handlers);
 480 
 481   for (int i = 0; i < info_list->length(); i++) {
 482     ExceptionInfo* info = info_list->at(i);
 483     XHandlers* handlers = info->exception_handlers();
 484 
 485     // empty the arrays
 486     bcis->trunc_to(0);
 487     scope_depths->trunc_to(0);
 488     pcos->trunc_to(0);
 489 
 490     for (int i = 0; i < handlers->length(); i++) {
 491       XHandler* handler = handlers->handler_at(i);
 492       assert(handler->entry_pco() != -1, "must have been generated");
 493 
 494       int e = bcis->find(handler->handler_bci());
 495       if (e >= 0 && scope_depths->at(e) == handler->scope_count()) {
 496         // two different handlers are declared to dispatch to the same
 497         // catch bci.  During parsing we created edges for each
 498         // handler but we really only need one.  The exception handler
 499         // table will also get unhappy if we try to declare both since
 500         // it's nonsensical.  Just skip this handler.
 501         continue;
 502       }
 503 
 504       bcis->append(handler->handler_bci());
 505       if (handler->handler_bci() == -1) {
 506         // insert a wildcard handler at scope depth 0 so that the
 507         // exception lookup logic with find it.
 508         scope_depths->append(0);
 509       } else {
 510         scope_depths->append(handler->scope_count());
 511     }
 512       pcos->append(handler->entry_pco());
 513 
 514       // stop processing once we hit a catch any
 515       if (handler->is_catch_all()) {
 516         assert(i == handlers->length() - 1, "catch all must be last handler");
 517   }
 518     }
 519     exception_handler_table()->add_subtable(info->pco(), bcis, scope_depths, pcos);
 520   }
 521 }
 522 
 523 
 524 Compilation::Compilation(AbstractCompiler* compiler, ciEnv* env, ciMethod* method,
 525                          int osr_bci, BufferBlob* buffer_blob)
 526 : _compiler(compiler)
 527 , _env(env)
 528 , _log(env->log())
 529 , _method(method)
 530 , _osr_bci(osr_bci)
 531 , _hir(NULL)
 532 , _max_spills(-1)
 533 , _frame_map(NULL)
 534 , _masm(NULL)
 535 , _has_exception_handlers(false)
 536 , _has_fpu_code(true)   // pessimistic assumption
 537 , _would_profile(false)
 538 , _has_unsafe_access(false)
 539 , _has_method_handle_invokes(false)
 540 , _bailout_msg(NULL)
 541 , _exception_info_list(NULL)
 542 , _allocator(NULL)
 543 , _next_id(0)
 544 , _next_block_id(0)
 545 , _code(buffer_blob)
 546 , _has_access_indexed(false)
 547 , _current_instruction(NULL)
 548 #ifndef PRODUCT
 549 , _last_instruction_printed(NULL)
 550 #endif // PRODUCT
 551 {
 552   PhaseTraceTime timeit(_t_compile);
 553   _arena = Thread::current()->resource_area();
 554   _env->set_compiler_data(this);
 555   _exception_info_list = new ExceptionInfoList();
 556   _implicit_exception_table.set_size(0);
 557   compile_method();
 558   if (bailed_out()) {
 559     _env->record_method_not_compilable(bailout_msg(), !TieredCompilation);
 560     if (is_profiling()) {
 561       // Compilation failed, create MDO, which would signal the interpreter
 562       // to start profiling on its own.
 563       _method->ensure_method_data();
 564     }
 565   } else if (is_profiling()) {
 566     ciMethodData *md = method->method_data_or_null();
 567     if (md != NULL) {
 568       md->set_would_profile(_would_profile);
 569     }
 570   }
 571 }
 572 
 573 Compilation::~Compilation() {
 574   _env->set_compiler_data(NULL);
 575 }
 576 
 577 
 578 void Compilation::add_exception_handlers_for_pco(int pco, XHandlers* exception_handlers) {
 579 #ifndef PRODUCT
 580   if (PrintExceptionHandlers && Verbose) {
 581     tty->print_cr("  added exception scope for pco %d", pco);
 582   }
 583 #endif
 584   // Note: we do not have program counters for these exception handlers yet
 585   exception_info_list()->push(new ExceptionInfo(pco, exception_handlers));
 586 }
 587 
 588 
 589 void Compilation::notice_inlined_method(ciMethod* method) {
 590   _env->notice_inlined_method(method);
 591 }
 592 
 593 
 594 void Compilation::bailout(const char* msg) {
 595   assert(msg != NULL, "bailout message must exist");
 596   if (!bailed_out()) {
 597     // keep first bailout message
 598     if (PrintCompilation || PrintBailouts) tty->print_cr("compilation bailout: %s", msg);
 599     _bailout_msg = msg;
 600   }
 601 }
 602 
 603 
 604 void Compilation::print_timers() {
 605   // tty->print_cr("    Native methods         : %6.3f s, Average : %2.3f", CompileBroker::_t_native_compilation.seconds(), CompileBroker::_t_native_compilation.seconds() / CompileBroker::_total_native_compile_count);
 606   float total = timers[_t_setup].seconds() + timers[_t_buildIR].seconds() + timers[_t_emit_lir].seconds() + timers[_t_lir_schedule].seconds() + timers[_t_codeemit].seconds() + timers[_t_codeinstall].seconds();
 607 
 608 
 609   tty->print_cr("    Detailed C1 Timings");
 610   tty->print_cr("       Setup time:        %6.3f s (%4.1f%%)",    timers[_t_setup].seconds(),           (timers[_t_setup].seconds() / total) * 100.0);
 611   tty->print_cr("       Build IR:          %6.3f s (%4.1f%%)",    timers[_t_buildIR].seconds(),         (timers[_t_buildIR].seconds() / total) * 100.0);
 612   float t_optimizeIR = timers[_t_optimize_blocks].seconds() + timers[_t_optimize_null_checks].seconds();
 613   tty->print_cr("         Optimize:           %6.3f s (%4.1f%%)", t_optimizeIR,                         (t_optimizeIR / total) * 100.0);
 614   tty->print_cr("         RCE:                %6.3f s (%4.1f%%)", timers[_t_rangeCheckElimination].seconds(),      (timers[_t_rangeCheckElimination].seconds() / total) * 100.0);
 615   tty->print_cr("       Emit LIR:          %6.3f s (%4.1f%%)",    timers[_t_emit_lir].seconds(),        (timers[_t_emit_lir].seconds() / total) * 100.0);
 616   tty->print_cr("         LIR Gen:          %6.3f s (%4.1f%%)",   timers[_t_lirGeneration].seconds(), (timers[_t_lirGeneration].seconds() / total) * 100.0);
 617   tty->print_cr("         Linear Scan:      %6.3f s (%4.1f%%)",   timers[_t_linearScan].seconds(),    (timers[_t_linearScan].seconds() / total) * 100.0);
 618   NOT_PRODUCT(LinearScan::print_timers(timers[_t_linearScan].seconds()));
 619   tty->print_cr("       LIR Schedule:      %6.3f s (%4.1f%%)",    timers[_t_lir_schedule].seconds(),  (timers[_t_lir_schedule].seconds() / total) * 100.0);
 620   tty->print_cr("       Code Emission:     %6.3f s (%4.1f%%)",    timers[_t_codeemit].seconds(),        (timers[_t_codeemit].seconds() / total) * 100.0);
 621   tty->print_cr("       Code Installation: %6.3f s (%4.1f%%)",    timers[_t_codeinstall].seconds(),     (timers[_t_codeinstall].seconds() / total) * 100.0);
 622   tty->print_cr("       Instruction Nodes: %6d nodes",    totalInstructionNodes);
 623 
 624   NOT_PRODUCT(LinearScan::print_statistics());
 625 }
 626 
 627 
 628 #ifndef PRODUCT
 629 void Compilation::compile_only_this_method() {
 630   ResourceMark rm;
 631   fileStream stream(fopen("c1_compile_only", "wt"));
 632   stream.print_cr("# c1 compile only directives");
 633   compile_only_this_scope(&stream, hir()->top_scope());
 634 }
 635 
 636 
 637 void Compilation::compile_only_this_scope(outputStream* st, IRScope* scope) {
 638   st->print("CompileOnly=");
 639   scope->method()->holder()->name()->print_symbol_on(st);
 640   st->print(".");
 641   scope->method()->name()->print_symbol_on(st);
 642   st->cr();
 643 }
 644 
 645 
 646 void Compilation::exclude_this_method() {
 647   fileStream stream(fopen(".hotspot_compiler", "at"));
 648   stream.print("exclude ");
 649   method()->holder()->name()->print_symbol_on(&stream);
 650   stream.print(" ");
 651   method()->name()->print_symbol_on(&stream);
 652   stream.cr();
 653   stream.cr();
 654 }
 655 #endif