1 /* 2 * Copyright (c) 2003, 2013, 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 "interp_masm_x86_64.hpp" 27 #include "interpreter/interpreter.hpp" 28 #include "interpreter/interpreterRuntime.hpp" 29 #include "oops/arrayOop.hpp" 30 #include "oops/markOop.hpp" 31 #include "oops/methodData.hpp" 32 #include "oops/method.hpp" 33 #include "prims/jvmtiExport.hpp" 34 #include "prims/jvmtiRedefineClassesTrace.hpp" 35 #include "prims/jvmtiThreadState.hpp" 36 #include "runtime/basicLock.hpp" 37 #include "runtime/biasedLocking.hpp" 38 #include "runtime/sharedRuntime.hpp" 39 #include "runtime/thread.inline.hpp" 40 41 42 // Implementation of InterpreterMacroAssembler 43 44 #ifdef CC_INTERP 45 void InterpreterMacroAssembler::get_method(Register reg) { 46 movptr(reg, Address(rbp, -((int)sizeof(BytecodeInterpreter) + 2 * wordSize))); 47 movptr(reg, Address(reg, byte_offset_of(BytecodeInterpreter, _method))); 48 } 49 #endif // CC_INTERP 50 51 #ifndef CC_INTERP 52 53 void InterpreterMacroAssembler::call_VM_leaf_base(address entry_point, 54 int number_of_arguments) { 55 // interpreter specific 56 // 57 // Note: No need to save/restore bcp & locals (r13 & r14) pointer 58 // since these are callee saved registers and no blocking/ 59 // GC can happen in leaf calls. 60 // Further Note: DO NOT save/restore bcp/locals. If a caller has 61 // already saved them so that it can use esi/edi as temporaries 62 // then a save/restore here will DESTROY the copy the caller 63 // saved! There used to be a save_bcp() that only happened in 64 // the ASSERT path (no restore_bcp). Which caused bizarre failures 65 // when jvm built with ASSERTs. 66 #ifdef ASSERT 67 { 68 Label L; 69 cmpptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD); 70 jcc(Assembler::equal, L); 71 stop("InterpreterMacroAssembler::call_VM_leaf_base:" 72 " last_sp != NULL"); 73 bind(L); 74 } 75 #endif 76 // super call 77 MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments); 78 // interpreter specific 79 // Used to ASSERT that r13/r14 were equal to frame's bcp/locals 80 // but since they may not have been saved (and we don't want to 81 // save thme here (see note above) the assert is invalid. 82 } 83 84 void InterpreterMacroAssembler::call_VM_base(Register oop_result, 85 Register java_thread, 86 Register last_java_sp, 87 address entry_point, 88 int number_of_arguments, 89 bool check_exceptions) { 90 // interpreter specific 91 // 92 // Note: Could avoid restoring locals ptr (callee saved) - however doesn't 93 // really make a difference for these runtime calls, since they are 94 // slow anyway. Btw., bcp must be saved/restored since it may change 95 // due to GC. 96 // assert(java_thread == noreg , "not expecting a precomputed java thread"); 97 save_bcp(); 98 #ifdef ASSERT 99 { 100 Label L; 101 cmpptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD); 102 jcc(Assembler::equal, L); 103 stop("InterpreterMacroAssembler::call_VM_leaf_base:" 104 " last_sp != NULL"); 105 bind(L); 106 } 107 #endif /* ASSERT */ 108 // super call 109 MacroAssembler::call_VM_base(oop_result, noreg, last_java_sp, 110 entry_point, number_of_arguments, 111 check_exceptions); 112 // interpreter specific 113 restore_bcp(); 114 restore_locals(); 115 } 116 117 118 void InterpreterMacroAssembler::check_and_handle_popframe(Register java_thread) { 119 if (JvmtiExport::can_pop_frame()) { 120 Label L; 121 // Initiate popframe handling only if it is not already being 122 // processed. If the flag has the popframe_processing bit set, it 123 // means that this code is called *during* popframe handling - we 124 // don't want to reenter. 125 // This method is only called just after the call into the vm in 126 // call_VM_base, so the arg registers are available. 127 movl(c_rarg0, Address(r15_thread, JavaThread::popframe_condition_offset())); 128 testl(c_rarg0, JavaThread::popframe_pending_bit); 129 jcc(Assembler::zero, L); 130 testl(c_rarg0, JavaThread::popframe_processing_bit); 131 jcc(Assembler::notZero, L); 132 // Call Interpreter::remove_activation_preserving_args_entry() to get the 133 // address of the same-named entrypoint in the generated interpreter code. 134 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_preserving_args_entry)); 135 jmp(rax); 136 bind(L); 137 } 138 } 139 140 141 void InterpreterMacroAssembler::load_earlyret_value(TosState state) { 142 movptr(rcx, Address(r15_thread, JavaThread::jvmti_thread_state_offset())); 143 const Address tos_addr(rcx, JvmtiThreadState::earlyret_tos_offset()); 144 const Address oop_addr(rcx, JvmtiThreadState::earlyret_oop_offset()); 145 const Address val_addr(rcx, JvmtiThreadState::earlyret_value_offset()); 146 switch (state) { 147 case atos: movptr(rax, oop_addr); 148 movptr(oop_addr, (int32_t)NULL_WORD); 149 verify_oop(rax, state); break; 150 case ltos: movptr(rax, val_addr); break; 151 case btos: // fall through 152 case ctos: // fall through 153 case stos: // fall through 154 case itos: movl(rax, val_addr); break; 155 case ftos: movflt(xmm0, val_addr); break; 156 case dtos: movdbl(xmm0, val_addr); break; 157 case vtos: /* nothing to do */ break; 158 default : ShouldNotReachHere(); 159 } 160 // Clean up tos value in the thread object 161 movl(tos_addr, (int) ilgl); 162 movl(val_addr, (int32_t) NULL_WORD); 163 } 164 165 166 void InterpreterMacroAssembler::check_and_handle_earlyret(Register java_thread) { 167 if (JvmtiExport::can_force_early_return()) { 168 Label L; 169 movptr(c_rarg0, Address(r15_thread, JavaThread::jvmti_thread_state_offset())); 170 testptr(c_rarg0, c_rarg0); 171 jcc(Assembler::zero, L); // if (thread->jvmti_thread_state() == NULL) exit; 172 173 // Initiate earlyret handling only if it is not already being processed. 174 // If the flag has the earlyret_processing bit set, it means that this code 175 // is called *during* earlyret handling - we don't want to reenter. 176 movl(c_rarg0, Address(c_rarg0, JvmtiThreadState::earlyret_state_offset())); 177 cmpl(c_rarg0, JvmtiThreadState::earlyret_pending); 178 jcc(Assembler::notEqual, L); 179 180 // Call Interpreter::remove_activation_early_entry() to get the address of the 181 // same-named entrypoint in the generated interpreter code. 182 movptr(c_rarg0, Address(r15_thread, JavaThread::jvmti_thread_state_offset())); 183 movl(c_rarg0, Address(c_rarg0, JvmtiThreadState::earlyret_tos_offset())); 184 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_early_entry), c_rarg0); 185 jmp(rax); 186 bind(L); 187 } 188 } 189 190 191 void InterpreterMacroAssembler::get_unsigned_2_byte_index_at_bcp( 192 Register reg, 193 int bcp_offset) { 194 assert(bcp_offset >= 0, "bcp is still pointing to start of bytecode"); 195 movl(reg, Address(r13, bcp_offset)); 196 bswapl(reg); 197 shrl(reg, 16); 198 } 199 200 201 void InterpreterMacroAssembler::get_cache_index_at_bcp(Register index, 202 int bcp_offset, 203 size_t index_size) { 204 assert(bcp_offset > 0, "bcp is still pointing to start of bytecode"); 205 if (index_size == sizeof(u2)) { 206 load_unsigned_short(index, Address(r13, bcp_offset)); 207 } else if (index_size == sizeof(u4)) { 208 assert(EnableInvokeDynamic, "giant index used only for JSR 292"); 209 movl(index, Address(r13, bcp_offset)); 210 // Check if the secondary index definition is still ~x, otherwise 211 // we have to change the following assembler code to calculate the 212 // plain index. 213 assert(ConstantPool::decode_invokedynamic_index(~123) == 123, "else change next line"); 214 notl(index); // convert to plain index 215 } else if (index_size == sizeof(u1)) { 216 load_unsigned_byte(index, Address(r13, bcp_offset)); 217 } else { 218 ShouldNotReachHere(); 219 } 220 } 221 222 223 void InterpreterMacroAssembler::get_cache_and_index_at_bcp(Register cache, 224 Register index, 225 int bcp_offset, 226 size_t index_size) { 227 assert_different_registers(cache, index); 228 get_cache_index_at_bcp(index, bcp_offset, index_size); 229 movptr(cache, Address(rbp, frame::interpreter_frame_cache_offset * wordSize)); 230 assert(sizeof(ConstantPoolCacheEntry) == 4 * wordSize, "adjust code below"); 231 // convert from field index to ConstantPoolCacheEntry index 232 assert(exact_log2(in_words(ConstantPoolCacheEntry::size())) == 2, "else change next line"); 233 shll(index, 2); 234 } 235 236 237 void InterpreterMacroAssembler::get_cache_and_index_and_bytecode_at_bcp(Register cache, 238 Register index, 239 Register bytecode, 240 int byte_no, 241 int bcp_offset, 242 size_t index_size) { 243 get_cache_and_index_at_bcp(cache, index, bcp_offset, index_size); 244 // We use a 32-bit load here since the layout of 64-bit words on 245 // little-endian machines allow us that. 246 movl(bytecode, Address(cache, index, Address::times_ptr, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::indices_offset())); 247 const int shift_count = (1 + byte_no) * BitsPerByte; 248 assert((byte_no == TemplateTable::f1_byte && shift_count == ConstantPoolCacheEntry::bytecode_1_shift) || 249 (byte_no == TemplateTable::f2_byte && shift_count == ConstantPoolCacheEntry::bytecode_2_shift), 250 "correct shift count"); 251 shrl(bytecode, shift_count); 252 assert(ConstantPoolCacheEntry::bytecode_1_mask == ConstantPoolCacheEntry::bytecode_2_mask, "common mask"); 253 andl(bytecode, ConstantPoolCacheEntry::bytecode_1_mask); 254 } 255 256 257 void InterpreterMacroAssembler::get_cache_entry_pointer_at_bcp(Register cache, 258 Register tmp, 259 int bcp_offset, 260 size_t index_size) { 261 assert(cache != tmp, "must use different register"); 262 get_cache_index_at_bcp(tmp, bcp_offset, index_size); 263 assert(sizeof(ConstantPoolCacheEntry) == 4 * wordSize, "adjust code below"); 264 // convert from field index to ConstantPoolCacheEntry index 265 // and from word offset to byte offset 266 assert(exact_log2(in_bytes(ConstantPoolCacheEntry::size_in_bytes())) == 2 + LogBytesPerWord, "else change next line"); 267 shll(tmp, 2 + LogBytesPerWord); 268 movptr(cache, Address(rbp, frame::interpreter_frame_cache_offset * wordSize)); 269 // skip past the header 270 addptr(cache, in_bytes(ConstantPoolCache::base_offset())); 271 addptr(cache, tmp); // construct pointer to cache entry 272 } 273 274 void InterpreterMacroAssembler::get_method_counters(Register method, 275 Register mcs, Label& skip) { 276 Label has_counters; 277 movptr(mcs, Address(method, Method::method_counters_offset())); 278 testptr(mcs, mcs); 279 jcc(Assembler::notZero, has_counters); 280 call_VM(noreg, CAST_FROM_FN_PTR(address, 281 InterpreterRuntime::build_method_counters), method); 282 movptr(mcs, Address(method,Method::method_counters_offset())); 283 testptr(mcs, mcs); 284 jcc(Assembler::zero, skip); // No MethodCounters allocated, OutOfMemory 285 bind(has_counters); 286 } 287 288 // Load object from cpool->resolved_references(index) 289 void InterpreterMacroAssembler::load_resolved_reference_at_index( 290 Register result, Register index) { 291 assert_different_registers(result, index); 292 // convert from field index to resolved_references() index and from 293 // word index to byte offset. Since this is a java object, it can be compressed 294 Register tmp = index; // reuse 295 shll(tmp, LogBytesPerHeapOop); 296 297 get_constant_pool(result); 298 // load pointer for resolved_references[] objArray 299 movptr(result, Address(result, ConstantPool::resolved_references_offset_in_bytes())); 300 // JNIHandles::resolve(obj); 301 movptr(result, Address(result, 0)); 302 // Add in the index 303 addptr(result, tmp); 304 load_heap_oop(result, Address(result, arrayOopDesc::base_offset_in_bytes(T_OBJECT))); 305 } 306 307 // Generate a subtype check: branch to ok_is_subtype if sub_klass is a 308 // subtype of super_klass. 309 // 310 // Args: 311 // rax: superklass 312 // Rsub_klass: subklass 313 // 314 // Kills: 315 // rcx, rdi 316 void InterpreterMacroAssembler::gen_subtype_check(Register Rsub_klass, 317 Label& ok_is_subtype) { 318 assert(Rsub_klass != rax, "rax holds superklass"); 319 assert(Rsub_klass != r14, "r14 holds locals"); 320 assert(Rsub_klass != r13, "r13 holds bcp"); 321 assert(Rsub_klass != rcx, "rcx holds 2ndary super array length"); 322 assert(Rsub_klass != rdi, "rdi holds 2ndary super array scan ptr"); 323 324 // Profile the not-null value's klass. 325 profile_typecheck(rcx, Rsub_klass, rdi); // blows rcx, reloads rdi 326 327 // Do the check. 328 check_klass_subtype(Rsub_klass, rax, rcx, ok_is_subtype); // blows rcx 329 330 // Profile the failure of the check. 331 profile_typecheck_failed(rcx); // blows rcx 332 } 333 334 335 336 // Java Expression Stack 337 338 void InterpreterMacroAssembler::pop_ptr(Register r) { 339 pop(r); 340 } 341 342 void InterpreterMacroAssembler::pop_i(Register r) { 343 // XXX can't use pop currently, upper half non clean 344 movl(r, Address(rsp, 0)); 345 addptr(rsp, wordSize); 346 } 347 348 void InterpreterMacroAssembler::pop_l(Register r) { 349 movq(r, Address(rsp, 0)); 350 addptr(rsp, 2 * Interpreter::stackElementSize); 351 } 352 353 void InterpreterMacroAssembler::pop_f(XMMRegister r) { 354 movflt(r, Address(rsp, 0)); 355 addptr(rsp, wordSize); 356 } 357 358 void InterpreterMacroAssembler::pop_d(XMMRegister r) { 359 movdbl(r, Address(rsp, 0)); 360 addptr(rsp, 2 * Interpreter::stackElementSize); 361 } 362 363 void InterpreterMacroAssembler::push_ptr(Register r) { 364 push(r); 365 } 366 367 void InterpreterMacroAssembler::push_i(Register r) { 368 push(r); 369 } 370 371 void InterpreterMacroAssembler::push_l(Register r) { 372 subptr(rsp, 2 * wordSize); 373 movq(Address(rsp, 0), r); 374 } 375 376 void InterpreterMacroAssembler::push_f(XMMRegister r) { 377 subptr(rsp, wordSize); 378 movflt(Address(rsp, 0), r); 379 } 380 381 void InterpreterMacroAssembler::push_d(XMMRegister r) { 382 subptr(rsp, 2 * wordSize); 383 movdbl(Address(rsp, 0), r); 384 } 385 386 void InterpreterMacroAssembler::pop(TosState state) { 387 switch (state) { 388 case atos: pop_ptr(); break; 389 case btos: 390 case ctos: 391 case stos: 392 case itos: pop_i(); break; 393 case ltos: pop_l(); break; 394 case ftos: pop_f(); break; 395 case dtos: pop_d(); break; 396 case vtos: /* nothing to do */ break; 397 default: ShouldNotReachHere(); 398 } 399 verify_oop(rax, state); 400 } 401 402 void InterpreterMacroAssembler::push(TosState state) { 403 verify_oop(rax, state); 404 switch (state) { 405 case atos: push_ptr(); break; 406 case btos: 407 case ctos: 408 case stos: 409 case itos: push_i(); break; 410 case ltos: push_l(); break; 411 case ftos: push_f(); break; 412 case dtos: push_d(); break; 413 case vtos: /* nothing to do */ break; 414 default : ShouldNotReachHere(); 415 } 416 } 417 418 419 // Helpers for swap and dup 420 void InterpreterMacroAssembler::load_ptr(int n, Register val) { 421 movptr(val, Address(rsp, Interpreter::expr_offset_in_bytes(n))); 422 } 423 424 void InterpreterMacroAssembler::store_ptr(int n, Register val) { 425 movptr(Address(rsp, Interpreter::expr_offset_in_bytes(n)), val); 426 } 427 428 429 void InterpreterMacroAssembler::prepare_to_jump_from_interpreted() { 430 // set sender sp 431 lea(r13, Address(rsp, wordSize)); 432 // record last_sp 433 movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), r13); 434 } 435 436 437 // Jump to from_interpreted entry of a call unless single stepping is possible 438 // in this thread in which case we must call the i2i entry 439 void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) { 440 prepare_to_jump_from_interpreted(); 441 442 if (JvmtiExport::can_post_interpreter_events()) { 443 Label run_compiled_code; 444 // JVMTI events, such as single-stepping, are implemented partly by avoiding running 445 // compiled code in threads for which the event is enabled. Check here for 446 // interp_only_mode if these events CAN be enabled. 447 // interp_only is an int, on little endian it is sufficient to test the byte only 448 // Is a cmpl faster? 449 cmpb(Address(r15_thread, JavaThread::interp_only_mode_offset()), 0); 450 jccb(Assembler::zero, run_compiled_code); 451 jmp(Address(method, Method::interpreter_entry_offset())); 452 bind(run_compiled_code); 453 } 454 455 jmp(Address(method, Method::from_interpreted_offset())); 456 457 } 458 459 460 // The following two routines provide a hook so that an implementation 461 // can schedule the dispatch in two parts. amd64 does not do this. 462 void InterpreterMacroAssembler::dispatch_prolog(TosState state, int step) { 463 // Nothing amd64 specific to be done here 464 } 465 466 void InterpreterMacroAssembler::dispatch_epilog(TosState state, int step) { 467 dispatch_next(state, step); 468 } 469 470 void InterpreterMacroAssembler::dispatch_base(TosState state, 471 address* table, 472 bool verifyoop) { 473 verify_FPU(1, state); 474 if (VerifyActivationFrameSize) { 475 Label L; 476 mov(rcx, rbp); 477 subptr(rcx, rsp); 478 int32_t min_frame_size = 479 (frame::link_offset - frame::interpreter_frame_initial_sp_offset) * 480 wordSize; 481 cmpptr(rcx, (int32_t)min_frame_size); 482 jcc(Assembler::greaterEqual, L); 483 stop("broken stack frame"); 484 bind(L); 485 } 486 if (verifyoop) { 487 verify_oop(rax, state); 488 } 489 lea(rscratch1, ExternalAddress((address)table)); 490 jmp(Address(rscratch1, rbx, Address::times_8)); 491 } 492 493 void InterpreterMacroAssembler::dispatch_only(TosState state) { 494 dispatch_base(state, Interpreter::dispatch_table(state)); 495 } 496 497 void InterpreterMacroAssembler::dispatch_only_normal(TosState state) { 498 dispatch_base(state, Interpreter::normal_table(state)); 499 } 500 501 void InterpreterMacroAssembler::dispatch_only_noverify(TosState state) { 502 dispatch_base(state, Interpreter::normal_table(state), false); 503 } 504 505 506 void InterpreterMacroAssembler::dispatch_next(TosState state, int step) { 507 // load next bytecode (load before advancing r13 to prevent AGI) 508 load_unsigned_byte(rbx, Address(r13, step)); 509 // advance r13 510 increment(r13, step); 511 dispatch_base(state, Interpreter::dispatch_table(state)); 512 } 513 514 void InterpreterMacroAssembler::dispatch_via(TosState state, address* table) { 515 // load current bytecode 516 load_unsigned_byte(rbx, Address(r13, 0)); 517 dispatch_base(state, table); 518 } 519 520 // remove activation 521 // 522 // Unlock the receiver if this is a synchronized method. 523 // Unlock any Java monitors from syncronized blocks. 524 // Remove the activation from the stack. 525 // 526 // If there are locked Java monitors 527 // If throw_monitor_exception 528 // throws IllegalMonitorStateException 529 // Else if install_monitor_exception 530 // installs IllegalMonitorStateException 531 // Else 532 // no error processing 533 void InterpreterMacroAssembler::remove_activation( 534 TosState state, 535 Register ret_addr, 536 bool throw_monitor_exception, 537 bool install_monitor_exception, 538 bool notify_jvmdi) { 539 // Note: Registers rdx xmm0 may be in use for the 540 // result check if synchronized method 541 Label unlocked, unlock, no_unlock; 542 543 // get the value of _do_not_unlock_if_synchronized into rdx 544 const Address do_not_unlock_if_synchronized(r15_thread, 545 in_bytes(JavaThread::do_not_unlock_if_synchronized_offset())); 546 movbool(rdx, do_not_unlock_if_synchronized); 547 movbool(do_not_unlock_if_synchronized, false); // reset the flag 548 549 // get method access flags 550 movptr(rbx, Address(rbp, frame::interpreter_frame_method_offset * wordSize)); 551 movl(rcx, Address(rbx, Method::access_flags_offset())); 552 testl(rcx, JVM_ACC_SYNCHRONIZED); 553 jcc(Assembler::zero, unlocked); 554 555 // Don't unlock anything if the _do_not_unlock_if_synchronized flag 556 // is set. 557 testbool(rdx); 558 jcc(Assembler::notZero, no_unlock); 559 560 // unlock monitor 561 push(state); // save result 562 563 // BasicObjectLock will be first in list, since this is a 564 // synchronized method. However, need to check that the object has 565 // not been unlocked by an explicit monitorexit bytecode. 566 const Address monitor(rbp, frame::interpreter_frame_initial_sp_offset * 567 wordSize - (int) sizeof(BasicObjectLock)); 568 // We use c_rarg1 so that if we go slow path it will be the correct 569 // register for unlock_object to pass to VM directly 570 lea(c_rarg1, monitor); // address of first monitor 571 572 movptr(rax, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes())); 573 testptr(rax, rax); 574 jcc(Assembler::notZero, unlock); 575 576 pop(state); 577 if (throw_monitor_exception) { 578 // Entry already unlocked, need to throw exception 579 call_VM(noreg, CAST_FROM_FN_PTR(address, 580 InterpreterRuntime::throw_illegal_monitor_state_exception)); 581 should_not_reach_here(); 582 } else { 583 // Monitor already unlocked during a stack unroll. If requested, 584 // install an illegal_monitor_state_exception. Continue with 585 // stack unrolling. 586 if (install_monitor_exception) { 587 call_VM(noreg, CAST_FROM_FN_PTR(address, 588 InterpreterRuntime::new_illegal_monitor_state_exception)); 589 } 590 jmp(unlocked); 591 } 592 593 bind(unlock); 594 unlock_object(c_rarg1); 595 pop(state); 596 597 // Check that for block-structured locking (i.e., that all locked 598 // objects has been unlocked) 599 bind(unlocked); 600 601 // rax: Might contain return value 602 603 // Check that all monitors are unlocked 604 { 605 Label loop, exception, entry, restart; 606 const int entry_size = frame::interpreter_frame_monitor_size() * wordSize; 607 const Address monitor_block_top( 608 rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize); 609 const Address monitor_block_bot( 610 rbp, frame::interpreter_frame_initial_sp_offset * wordSize); 611 612 bind(restart); 613 // We use c_rarg1 so that if we go slow path it will be the correct 614 // register for unlock_object to pass to VM directly 615 movptr(c_rarg1, monitor_block_top); // points to current entry, starting 616 // with top-most entry 617 lea(rbx, monitor_block_bot); // points to word before bottom of 618 // monitor block 619 jmp(entry); 620 621 // Entry already locked, need to throw exception 622 bind(exception); 623 624 if (throw_monitor_exception) { 625 // Throw exception 626 MacroAssembler::call_VM(noreg, 627 CAST_FROM_FN_PTR(address, InterpreterRuntime:: 628 throw_illegal_monitor_state_exception)); 629 should_not_reach_here(); 630 } else { 631 // Stack unrolling. Unlock object and install illegal_monitor_exception. 632 // Unlock does not block, so don't have to worry about the frame. 633 // We don't have to preserve c_rarg1 since we are going to throw an exception. 634 635 push(state); 636 unlock_object(c_rarg1); 637 pop(state); 638 639 if (install_monitor_exception) { 640 call_VM(noreg, CAST_FROM_FN_PTR(address, 641 InterpreterRuntime:: 642 new_illegal_monitor_state_exception)); 643 } 644 645 jmp(restart); 646 } 647 648 bind(loop); 649 // check if current entry is used 650 cmpptr(Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes()), (int32_t) NULL); 651 jcc(Assembler::notEqual, exception); 652 653 addptr(c_rarg1, entry_size); // otherwise advance to next entry 654 bind(entry); 655 cmpptr(c_rarg1, rbx); // check if bottom reached 656 jcc(Assembler::notEqual, loop); // if not at bottom then check this entry 657 } 658 659 bind(no_unlock); 660 661 // jvmti support 662 if (notify_jvmdi) { 663 notify_method_exit(state, NotifyJVMTI); // preserve TOSCA 664 } else { 665 notify_method_exit(state, SkipNotifyJVMTI); // preserve TOSCA 666 } 667 668 // remove activation 669 // get sender sp 670 movptr(rbx, 671 Address(rbp, frame::interpreter_frame_sender_sp_offset * wordSize)); 672 leave(); // remove frame anchor 673 pop(ret_addr); // get return address 674 mov(rsp, rbx); // set sp to sender sp 675 } 676 677 #endif // C_INTERP 678 679 // Lock object 680 // 681 // Args: 682 // c_rarg1: BasicObjectLock to be used for locking 683 // 684 // Kills: 685 // rax 686 // c_rarg0, c_rarg1, c_rarg2, c_rarg3, .. (param regs) 687 // rscratch1, rscratch2 (scratch regs) 688 void InterpreterMacroAssembler::lock_object(Register lock_reg) { 689 assert(lock_reg == c_rarg1, "The argument is only for looks. It must be c_rarg1"); 690 691 if (UseHeavyMonitors) { 692 call_VM(noreg, 693 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), 694 lock_reg); 695 } else { 696 Label done; 697 698 const Register swap_reg = rax; // Must use rax for cmpxchg instruction 699 const Register obj_reg = c_rarg3; // Will contain the oop 700 701 const int obj_offset = BasicObjectLock::obj_offset_in_bytes(); 702 const int lock_offset = BasicObjectLock::lock_offset_in_bytes (); 703 const int mark_offset = lock_offset + 704 BasicLock::displaced_header_offset_in_bytes(); 705 706 Label slow_case; 707 708 // Load object pointer into obj_reg %c_rarg3 709 movptr(obj_reg, Address(lock_reg, obj_offset)); 710 711 if (UseBiasedLocking) { 712 biased_locking_enter(lock_reg, obj_reg, swap_reg, rscratch1, false, done, &slow_case); 713 } 714 715 // Load immediate 1 into swap_reg %rax 716 movl(swap_reg, 1); 717 718 // Load (object->mark() | 1) into swap_reg %rax 719 orptr(swap_reg, Address(obj_reg, 0)); 720 721 // Save (object->mark() | 1) into BasicLock's displaced header 722 movptr(Address(lock_reg, mark_offset), swap_reg); 723 724 assert(lock_offset == 0, 725 "displached header must be first word in BasicObjectLock"); 726 727 if (os::is_MP()) lock(); 728 cmpxchgptr(lock_reg, Address(obj_reg, 0)); 729 if (PrintBiasedLockingStatistics) { 730 cond_inc32(Assembler::zero, 731 ExternalAddress((address) BiasedLocking::fast_path_entry_count_addr())); 732 } 733 jcc(Assembler::zero, done); 734 735 // Test if the oopMark is an obvious stack pointer, i.e., 736 // 1) (mark & 7) == 0, and 737 // 2) rsp <= mark < mark + os::pagesize() 738 // 739 // These 3 tests can be done by evaluating the following 740 // expression: ((mark - rsp) & (7 - os::vm_page_size())), 741 // assuming both stack pointer and pagesize have their 742 // least significant 3 bits clear. 743 // NOTE: the oopMark is in swap_reg %rax as the result of cmpxchg 744 subptr(swap_reg, rsp); 745 andptr(swap_reg, 7 - os::vm_page_size()); 746 747 // Save the test result, for recursive case, the result is zero 748 movptr(Address(lock_reg, mark_offset), swap_reg); 749 750 if (PrintBiasedLockingStatistics) { 751 cond_inc32(Assembler::zero, 752 ExternalAddress((address) BiasedLocking::fast_path_entry_count_addr())); 753 } 754 jcc(Assembler::zero, done); 755 756 bind(slow_case); 757 758 // Call the runtime routine for slow case 759 call_VM(noreg, 760 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), 761 lock_reg); 762 763 bind(done); 764 } 765 } 766 767 768 // Unlocks an object. Used in monitorexit bytecode and 769 // remove_activation. Throws an IllegalMonitorException if object is 770 // not locked by current thread. 771 // 772 // Args: 773 // c_rarg1: BasicObjectLock for lock 774 // 775 // Kills: 776 // rax 777 // c_rarg0, c_rarg1, c_rarg2, c_rarg3, ... (param regs) 778 // rscratch1, rscratch2 (scratch regs) 779 void InterpreterMacroAssembler::unlock_object(Register lock_reg) { 780 assert(lock_reg == c_rarg1, "The argument is only for looks. It must be rarg1"); 781 782 if (UseHeavyMonitors) { 783 call_VM(noreg, 784 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), 785 lock_reg); 786 } else { 787 Label done; 788 789 const Register swap_reg = rax; // Must use rax for cmpxchg instruction 790 const Register header_reg = c_rarg2; // Will contain the old oopMark 791 const Register obj_reg = c_rarg3; // Will contain the oop 792 793 save_bcp(); // Save in case of exception 794 795 // Convert from BasicObjectLock structure to object and BasicLock 796 // structure Store the BasicLock address into %rax 797 lea(swap_reg, Address(lock_reg, BasicObjectLock::lock_offset_in_bytes())); 798 799 // Load oop into obj_reg(%c_rarg3) 800 movptr(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes())); 801 802 // Free entry 803 movptr(Address(lock_reg, BasicObjectLock::obj_offset_in_bytes()), (int32_t)NULL_WORD); 804 805 if (UseBiasedLocking) { 806 biased_locking_exit(obj_reg, header_reg, done); 807 } 808 809 // Load the old header from BasicLock structure 810 movptr(header_reg, Address(swap_reg, 811 BasicLock::displaced_header_offset_in_bytes())); 812 813 // Test for recursion 814 testptr(header_reg, header_reg); 815 816 // zero for recursive case 817 jcc(Assembler::zero, done); 818 819 // Atomic swap back the old header 820 if (os::is_MP()) lock(); 821 cmpxchgptr(header_reg, Address(obj_reg, 0)); 822 823 // zero for recursive case 824 jcc(Assembler::zero, done); 825 826 // Call the runtime routine for slow case. 827 movptr(Address(lock_reg, BasicObjectLock::obj_offset_in_bytes()), 828 obj_reg); // restore obj 829 call_VM(noreg, 830 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), 831 lock_reg); 832 833 bind(done); 834 835 restore_bcp(); 836 } 837 } 838 839 #ifndef CC_INTERP 840 841 void InterpreterMacroAssembler::test_method_data_pointer(Register mdp, 842 Label& zero_continue) { 843 assert(ProfileInterpreter, "must be profiling interpreter"); 844 movptr(mdp, Address(rbp, frame::interpreter_frame_mdx_offset * wordSize)); 845 testptr(mdp, mdp); 846 jcc(Assembler::zero, zero_continue); 847 } 848 849 850 // Set the method data pointer for the current bcp. 851 void InterpreterMacroAssembler::set_method_data_pointer_for_bcp() { 852 assert(ProfileInterpreter, "must be profiling interpreter"); 853 Label set_mdp; 854 push(rax); 855 push(rbx); 856 857 get_method(rbx); 858 // Test MDO to avoid the call if it is NULL. 859 movptr(rax, Address(rbx, in_bytes(Method::method_data_offset()))); 860 testptr(rax, rax); 861 jcc(Assembler::zero, set_mdp); 862 // rbx: method 863 // r13: bcp 864 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), rbx, r13); 865 // rax: mdi 866 // mdo is guaranteed to be non-zero here, we checked for it before the call. 867 movptr(rbx, Address(rbx, in_bytes(Method::method_data_offset()))); 868 addptr(rbx, in_bytes(MethodData::data_offset())); 869 addptr(rax, rbx); 870 bind(set_mdp); 871 movptr(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), rax); 872 pop(rbx); 873 pop(rax); 874 } 875 876 void InterpreterMacroAssembler::verify_method_data_pointer() { 877 assert(ProfileInterpreter, "must be profiling interpreter"); 878 #ifdef ASSERT 879 Label verify_continue; 880 push(rax); 881 push(rbx); 882 push(c_rarg3); 883 push(c_rarg2); 884 test_method_data_pointer(c_rarg3, verify_continue); // If mdp is zero, continue 885 get_method(rbx); 886 887 // If the mdp is valid, it will point to a DataLayout header which is 888 // consistent with the bcp. The converse is highly probable also. 889 load_unsigned_short(c_rarg2, 890 Address(c_rarg3, in_bytes(DataLayout::bci_offset()))); 891 addptr(c_rarg2, Address(rbx, Method::const_offset())); 892 lea(c_rarg2, Address(c_rarg2, ConstMethod::codes_offset())); 893 cmpptr(c_rarg2, r13); 894 jcc(Assembler::equal, verify_continue); 895 // rbx: method 896 // r13: bcp 897 // c_rarg3: mdp 898 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp), 899 rbx, r13, c_rarg3); 900 bind(verify_continue); 901 pop(c_rarg2); 902 pop(c_rarg3); 903 pop(rbx); 904 pop(rax); 905 #endif // ASSERT 906 } 907 908 909 void InterpreterMacroAssembler::set_mdp_data_at(Register mdp_in, 910 int constant, 911 Register value) { 912 assert(ProfileInterpreter, "must be profiling interpreter"); 913 Address data(mdp_in, constant); 914 movptr(data, value); 915 } 916 917 918 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in, 919 int constant, 920 bool decrement) { 921 // Counter address 922 Address data(mdp_in, constant); 923 924 increment_mdp_data_at(data, decrement); 925 } 926 927 void InterpreterMacroAssembler::increment_mdp_data_at(Address data, 928 bool decrement) { 929 assert(ProfileInterpreter, "must be profiling interpreter"); 930 // %%% this does 64bit counters at best it is wasting space 931 // at worst it is a rare bug when counters overflow 932 933 if (decrement) { 934 // Decrement the register. Set condition codes. 935 addptr(data, (int32_t) -DataLayout::counter_increment); 936 // If the decrement causes the counter to overflow, stay negative 937 Label L; 938 jcc(Assembler::negative, L); 939 addptr(data, (int32_t) DataLayout::counter_increment); 940 bind(L); 941 } else { 942 assert(DataLayout::counter_increment == 1, 943 "flow-free idiom only works with 1"); 944 // Increment the register. Set carry flag. 945 addptr(data, DataLayout::counter_increment); 946 // If the increment causes the counter to overflow, pull back by 1. 947 sbbptr(data, (int32_t)0); 948 } 949 } 950 951 952 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in, 953 Register reg, 954 int constant, 955 bool decrement) { 956 Address data(mdp_in, reg, Address::times_1, constant); 957 958 increment_mdp_data_at(data, decrement); 959 } 960 961 void InterpreterMacroAssembler::set_mdp_flag_at(Register mdp_in, 962 int flag_byte_constant) { 963 assert(ProfileInterpreter, "must be profiling interpreter"); 964 int header_offset = in_bytes(DataLayout::header_offset()); 965 int header_bits = DataLayout::flag_mask_to_header_mask(flag_byte_constant); 966 // Set the flag 967 orl(Address(mdp_in, header_offset), header_bits); 968 } 969 970 971 972 void InterpreterMacroAssembler::test_mdp_data_at(Register mdp_in, 973 int offset, 974 Register value, 975 Register test_value_out, 976 Label& not_equal_continue) { 977 assert(ProfileInterpreter, "must be profiling interpreter"); 978 if (test_value_out == noreg) { 979 cmpptr(value, Address(mdp_in, offset)); 980 } else { 981 // Put the test value into a register, so caller can use it: 982 movptr(test_value_out, Address(mdp_in, offset)); 983 cmpptr(test_value_out, value); 984 } 985 jcc(Assembler::notEqual, not_equal_continue); 986 } 987 988 989 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in, 990 int offset_of_disp) { 991 assert(ProfileInterpreter, "must be profiling interpreter"); 992 Address disp_address(mdp_in, offset_of_disp); 993 addptr(mdp_in, disp_address); 994 movptr(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), mdp_in); 995 } 996 997 998 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in, 999 Register reg, 1000 int offset_of_disp) { 1001 assert(ProfileInterpreter, "must be profiling interpreter"); 1002 Address disp_address(mdp_in, reg, Address::times_1, offset_of_disp); 1003 addptr(mdp_in, disp_address); 1004 movptr(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), mdp_in); 1005 } 1006 1007 1008 void InterpreterMacroAssembler::update_mdp_by_constant(Register mdp_in, 1009 int constant) { 1010 assert(ProfileInterpreter, "must be profiling interpreter"); 1011 addptr(mdp_in, constant); 1012 movptr(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), mdp_in); 1013 } 1014 1015 1016 void InterpreterMacroAssembler::update_mdp_for_ret(Register return_bci) { 1017 assert(ProfileInterpreter, "must be profiling interpreter"); 1018 push(return_bci); // save/restore across call_VM 1019 call_VM(noreg, 1020 CAST_FROM_FN_PTR(address, InterpreterRuntime::update_mdp_for_ret), 1021 return_bci); 1022 pop(return_bci); 1023 } 1024 1025 1026 void InterpreterMacroAssembler::profile_taken_branch(Register mdp, 1027 Register bumped_count) { 1028 if (ProfileInterpreter) { 1029 Label profile_continue; 1030 1031 // If no method data exists, go to profile_continue. 1032 // Otherwise, assign to mdp 1033 test_method_data_pointer(mdp, profile_continue); 1034 1035 // We are taking a branch. Increment the taken count. 1036 // We inline increment_mdp_data_at to return bumped_count in a register 1037 //increment_mdp_data_at(mdp, in_bytes(JumpData::taken_offset())); 1038 Address data(mdp, in_bytes(JumpData::taken_offset())); 1039 movptr(bumped_count, data); 1040 assert(DataLayout::counter_increment == 1, 1041 "flow-free idiom only works with 1"); 1042 addptr(bumped_count, DataLayout::counter_increment); 1043 sbbptr(bumped_count, 0); 1044 movptr(data, bumped_count); // Store back out 1045 1046 // The method data pointer needs to be updated to reflect the new target. 1047 update_mdp_by_offset(mdp, in_bytes(JumpData::displacement_offset())); 1048 bind(profile_continue); 1049 } 1050 } 1051 1052 1053 void InterpreterMacroAssembler::profile_not_taken_branch(Register mdp) { 1054 if (ProfileInterpreter) { 1055 Label profile_continue; 1056 1057 // If no method data exists, go to profile_continue. 1058 test_method_data_pointer(mdp, profile_continue); 1059 1060 // We are taking a branch. Increment the not taken count. 1061 increment_mdp_data_at(mdp, in_bytes(BranchData::not_taken_offset())); 1062 1063 // The method data pointer needs to be updated to correspond to 1064 // the next bytecode 1065 update_mdp_by_constant(mdp, in_bytes(BranchData::branch_data_size())); 1066 bind(profile_continue); 1067 } 1068 } 1069 1070 void InterpreterMacroAssembler::profile_obj_type(Register obj, const Address& mdo_addr) { 1071 Label update, next, none; 1072 1073 verify_oop(obj); 1074 1075 testptr(obj, obj); 1076 jccb(Assembler::notZero, update); 1077 orptr(mdo_addr, TypeEntries::null_seen); 1078 jmpb(next); 1079 1080 bind(update); 1081 load_klass(obj, obj); 1082 1083 xorptr(obj, mdo_addr); 1084 testptr(obj, TypeEntries::type_klass_mask); 1085 jccb(Assembler::zero, next); // klass seen before, nothing to 1086 // do. The unknown bit may have been 1087 // set already but no need to check. 1088 1089 testptr(obj, TypeEntries::type_unknown); 1090 jccb(Assembler::notZero, next); // already unknown. Nothing to do anymore. 1091 1092 // There is a chance that by the time we do these checks (re-reading 1093 // profiling data from memory) another thread has set the profling 1094 // to this obj's klass and we set the profiling as unknow 1095 // erroneously 1096 cmpptr(mdo_addr, 0); 1097 jccb(Assembler::equal, none); 1098 cmpptr(mdo_addr, TypeEntries::null_seen); 1099 jccb(Assembler::equal, none); 1100 // There is a chance that the checks above (re-reading profiling 1101 // data from memory) fail if another thread has just set the 1102 // profiling to this obj's klass 1103 xorptr(obj, mdo_addr); 1104 testptr(obj, TypeEntries::type_klass_mask); 1105 jccb(Assembler::zero, next); 1106 1107 // different than before. Cannot keep accurate profile. 1108 orptr(mdo_addr, TypeEntries::type_unknown); 1109 jmpb(next); 1110 1111 bind(none); 1112 // first time here. Set profile type. 1113 movptr(mdo_addr, obj); 1114 1115 bind(next); 1116 } 1117 1118 void InterpreterMacroAssembler::profile_arguments_type(Register mdp, Register callee, Register tmp, bool is_virtual) { 1119 if (!ProfileInterpreter) { 1120 return; 1121 } 1122 1123 if (MethodData::profile_arguments() || MethodData::profile_return()) { 1124 Label profile_continue; 1125 1126 test_method_data_pointer(mdp, profile_continue); 1127 1128 int off_to_start = is_virtual ? in_bytes(VirtualCallData::virtual_call_data_size()) : in_bytes(CounterData::counter_data_size()); 1129 1130 cmpb(Address(mdp, in_bytes(DataLayout::tag_offset()) - off_to_start), is_virtual ? DataLayout::virtual_call_type_data_tag : DataLayout::call_type_data_tag); 1131 jcc(Assembler::notEqual, profile_continue); 1132 1133 if (MethodData::profile_arguments()) { 1134 Label done; 1135 int off_to_args = in_bytes(TypeEntriesAtCall::args_data_offset()); 1136 addptr(mdp, off_to_args); 1137 1138 for (int i = 0; i < TypeProfileArgsLimit; i++) { 1139 if (i > 0 || MethodData::profile_return()) { 1140 // If return value type is profiled we may have no argument to profile 1141 movq(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset())-off_to_args)); 1142 subl(tmp, i*TypeStackSlotEntries::per_arg_count()); 1143 cmpl(tmp, TypeStackSlotEntries::per_arg_count()); 1144 jcc(Assembler::less, done); 1145 } 1146 movptr(tmp, Address(callee, Method::const_offset())); 1147 load_unsigned_short(tmp, Address(tmp, ConstMethod::size_of_parameters_offset())); 1148 subq(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::stack_slot_offset(i))-off_to_args)); 1149 subl(tmp, 1); 1150 Address arg_addr = argument_address(tmp); 1151 movptr(tmp, arg_addr); 1152 1153 Address mdo_arg_addr(mdp, in_bytes(TypeEntriesAtCall::argument_type_offset(i))-off_to_args); 1154 profile_obj_type(tmp, mdo_arg_addr); 1155 1156 int to_add = in_bytes(TypeStackSlotEntries::per_arg_size()); 1157 addptr(mdp, to_add); 1158 off_to_args += to_add; 1159 } 1160 1161 if (MethodData::profile_return()) { 1162 movq(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset())-off_to_args)); 1163 subl(tmp, TypeProfileArgsLimit*TypeStackSlotEntries::per_arg_count()); 1164 } 1165 1166 bind(done); 1167 1168 if (MethodData::profile_return()) { 1169 // We're right after the type profile for the last 1170 // argument. tmp is the number of cell left in the 1171 // CallTypeData/VirtualCallTypeData to reach its end. Non null 1172 // if there's a return to profile. 1173 assert(ReturnTypeEntry::static_cell_count() < TypeStackSlotEntries::per_arg_count(), "can't move past ret type"); 1174 shll(tmp, exact_log2(DataLayout::cell_size)); 1175 addptr(mdp, tmp); 1176 } 1177 movptr(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), mdp); 1178 } else { 1179 assert(MethodData::profile_return(), "either profile call args or call ret"); 1180 update_mdp_by_constant(mdp, in_bytes(ReturnTypeEntry::size())); 1181 } 1182 1183 // mdp points right after the end of the 1184 // CallTypeData/VirtualCallTypeData, right after the cells for the 1185 // return value type if there's one 1186 1187 bind(profile_continue); 1188 } 1189 } 1190 1191 void InterpreterMacroAssembler::profile_return_type(Register mdp, Register ret, Register tmp) { 1192 if (ProfileInterpreter && MethodData::profile_return()) { 1193 Label profile_continue, done; 1194 1195 test_method_data_pointer(mdp, profile_continue); 1196 1197 Address mdo_ret_addr(mdp, -in_bytes(ReturnTypeEntry::size())); 1198 mov(tmp, ret); 1199 profile_obj_type(tmp, mdo_ret_addr); 1200 1201 bind(profile_continue); 1202 } 1203 } 1204 1205 void InterpreterMacroAssembler::profile_call(Register mdp) { 1206 if (ProfileInterpreter) { 1207 Label profile_continue; 1208 1209 // If no method data exists, go to profile_continue. 1210 test_method_data_pointer(mdp, profile_continue); 1211 1212 // We are making a call. Increment the count. 1213 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1214 1215 // The method data pointer needs to be updated to reflect the new target. 1216 update_mdp_by_constant(mdp, in_bytes(CounterData::counter_data_size())); 1217 bind(profile_continue); 1218 } 1219 } 1220 1221 1222 void InterpreterMacroAssembler::profile_final_call(Register mdp) { 1223 if (ProfileInterpreter) { 1224 Label profile_continue; 1225 1226 // If no method data exists, go to profile_continue. 1227 test_method_data_pointer(mdp, profile_continue); 1228 1229 // We are making a call. Increment the count. 1230 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1231 1232 // The method data pointer needs to be updated to reflect the new target. 1233 update_mdp_by_constant(mdp, 1234 in_bytes(VirtualCallData:: 1235 virtual_call_data_size())); 1236 bind(profile_continue); 1237 } 1238 } 1239 1240 1241 void InterpreterMacroAssembler::profile_virtual_call(Register receiver, 1242 Register mdp, 1243 Register reg2, 1244 bool receiver_can_be_null) { 1245 if (ProfileInterpreter) { 1246 Label profile_continue; 1247 1248 // If no method data exists, go to profile_continue. 1249 test_method_data_pointer(mdp, profile_continue); 1250 1251 Label skip_receiver_profile; 1252 if (receiver_can_be_null) { 1253 Label not_null; 1254 testptr(receiver, receiver); 1255 jccb(Assembler::notZero, not_null); 1256 // We are making a call. Increment the count for null receiver. 1257 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1258 jmp(skip_receiver_profile); 1259 bind(not_null); 1260 } 1261 1262 // Record the receiver type. 1263 record_klass_in_profile(receiver, mdp, reg2, true); 1264 bind(skip_receiver_profile); 1265 1266 // The method data pointer needs to be updated to reflect the new target. 1267 update_mdp_by_constant(mdp, 1268 in_bytes(VirtualCallData:: 1269 virtual_call_data_size())); 1270 bind(profile_continue); 1271 } 1272 } 1273 1274 // This routine creates a state machine for updating the multi-row 1275 // type profile at a virtual call site (or other type-sensitive bytecode). 1276 // The machine visits each row (of receiver/count) until the receiver type 1277 // is found, or until it runs out of rows. At the same time, it remembers 1278 // the location of the first empty row. (An empty row records null for its 1279 // receiver, and can be allocated for a newly-observed receiver type.) 1280 // Because there are two degrees of freedom in the state, a simple linear 1281 // search will not work; it must be a decision tree. Hence this helper 1282 // function is recursive, to generate the required tree structured code. 1283 // It's the interpreter, so we are trading off code space for speed. 1284 // See below for example code. 1285 void InterpreterMacroAssembler::record_klass_in_profile_helper( 1286 Register receiver, Register mdp, 1287 Register reg2, int start_row, 1288 Label& done, bool is_virtual_call) { 1289 if (TypeProfileWidth == 0) { 1290 if (is_virtual_call) { 1291 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1292 } 1293 return; 1294 } 1295 1296 int last_row = VirtualCallData::row_limit() - 1; 1297 assert(start_row <= last_row, "must be work left to do"); 1298 // Test this row for both the receiver and for null. 1299 // Take any of three different outcomes: 1300 // 1. found receiver => increment count and goto done 1301 // 2. found null => keep looking for case 1, maybe allocate this cell 1302 // 3. found something else => keep looking for cases 1 and 2 1303 // Case 3 is handled by a recursive call. 1304 for (int row = start_row; row <= last_row; row++) { 1305 Label next_test; 1306 bool test_for_null_also = (row == start_row); 1307 1308 // See if the receiver is receiver[n]. 1309 int recvr_offset = in_bytes(VirtualCallData::receiver_offset(row)); 1310 test_mdp_data_at(mdp, recvr_offset, receiver, 1311 (test_for_null_also ? reg2 : noreg), 1312 next_test); 1313 // (Reg2 now contains the receiver from the CallData.) 1314 1315 // The receiver is receiver[n]. Increment count[n]. 1316 int count_offset = in_bytes(VirtualCallData::receiver_count_offset(row)); 1317 increment_mdp_data_at(mdp, count_offset); 1318 jmp(done); 1319 bind(next_test); 1320 1321 if (test_for_null_also) { 1322 Label found_null; 1323 // Failed the equality check on receiver[n]... Test for null. 1324 testptr(reg2, reg2); 1325 if (start_row == last_row) { 1326 // The only thing left to do is handle the null case. 1327 if (is_virtual_call) { 1328 jccb(Assembler::zero, found_null); 1329 // Receiver did not match any saved receiver and there is no empty row for it. 1330 // Increment total counter to indicate polymorphic case. 1331 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1332 jmp(done); 1333 bind(found_null); 1334 } else { 1335 jcc(Assembler::notZero, done); 1336 } 1337 break; 1338 } 1339 // Since null is rare, make it be the branch-taken case. 1340 jcc(Assembler::zero, found_null); 1341 1342 // Put all the "Case 3" tests here. 1343 record_klass_in_profile_helper(receiver, mdp, reg2, start_row + 1, done, is_virtual_call); 1344 1345 // Found a null. Keep searching for a matching receiver, 1346 // but remember that this is an empty (unused) slot. 1347 bind(found_null); 1348 } 1349 } 1350 1351 // In the fall-through case, we found no matching receiver, but we 1352 // observed the receiver[start_row] is NULL. 1353 1354 // Fill in the receiver field and increment the count. 1355 int recvr_offset = in_bytes(VirtualCallData::receiver_offset(start_row)); 1356 set_mdp_data_at(mdp, recvr_offset, receiver); 1357 int count_offset = in_bytes(VirtualCallData::receiver_count_offset(start_row)); 1358 movl(reg2, DataLayout::counter_increment); 1359 set_mdp_data_at(mdp, count_offset, reg2); 1360 if (start_row > 0) { 1361 jmp(done); 1362 } 1363 } 1364 1365 // Example state machine code for three profile rows: 1366 // // main copy of decision tree, rooted at row[1] 1367 // if (row[0].rec == rec) { row[0].incr(); goto done; } 1368 // if (row[0].rec != NULL) { 1369 // // inner copy of decision tree, rooted at row[1] 1370 // if (row[1].rec == rec) { row[1].incr(); goto done; } 1371 // if (row[1].rec != NULL) { 1372 // // degenerate decision tree, rooted at row[2] 1373 // if (row[2].rec == rec) { row[2].incr(); goto done; } 1374 // if (row[2].rec != NULL) { count.incr(); goto done; } // overflow 1375 // row[2].init(rec); goto done; 1376 // } else { 1377 // // remember row[1] is empty 1378 // if (row[2].rec == rec) { row[2].incr(); goto done; } 1379 // row[1].init(rec); goto done; 1380 // } 1381 // } else { 1382 // // remember row[0] is empty 1383 // if (row[1].rec == rec) { row[1].incr(); goto done; } 1384 // if (row[2].rec == rec) { row[2].incr(); goto done; } 1385 // row[0].init(rec); goto done; 1386 // } 1387 // done: 1388 1389 void InterpreterMacroAssembler::record_klass_in_profile(Register receiver, 1390 Register mdp, Register reg2, 1391 bool is_virtual_call) { 1392 assert(ProfileInterpreter, "must be profiling"); 1393 Label done; 1394 1395 record_klass_in_profile_helper(receiver, mdp, reg2, 0, done, is_virtual_call); 1396 1397 bind (done); 1398 } 1399 1400 void InterpreterMacroAssembler::profile_ret(Register return_bci, 1401 Register mdp) { 1402 if (ProfileInterpreter) { 1403 Label profile_continue; 1404 uint row; 1405 1406 // If no method data exists, go to profile_continue. 1407 test_method_data_pointer(mdp, profile_continue); 1408 1409 // Update the total ret count. 1410 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1411 1412 for (row = 0; row < RetData::row_limit(); row++) { 1413 Label next_test; 1414 1415 // See if return_bci is equal to bci[n]: 1416 test_mdp_data_at(mdp, 1417 in_bytes(RetData::bci_offset(row)), 1418 return_bci, noreg, 1419 next_test); 1420 1421 // return_bci is equal to bci[n]. Increment the count. 1422 increment_mdp_data_at(mdp, in_bytes(RetData::bci_count_offset(row))); 1423 1424 // The method data pointer needs to be updated to reflect the new target. 1425 update_mdp_by_offset(mdp, 1426 in_bytes(RetData::bci_displacement_offset(row))); 1427 jmp(profile_continue); 1428 bind(next_test); 1429 } 1430 1431 update_mdp_for_ret(return_bci); 1432 1433 bind(profile_continue); 1434 } 1435 } 1436 1437 1438 void InterpreterMacroAssembler::profile_null_seen(Register mdp) { 1439 if (ProfileInterpreter) { 1440 Label profile_continue; 1441 1442 // If no method data exists, go to profile_continue. 1443 test_method_data_pointer(mdp, profile_continue); 1444 1445 set_mdp_flag_at(mdp, BitData::null_seen_byte_constant()); 1446 1447 // The method data pointer needs to be updated. 1448 int mdp_delta = in_bytes(BitData::bit_data_size()); 1449 if (TypeProfileCasts) { 1450 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size()); 1451 } 1452 update_mdp_by_constant(mdp, mdp_delta); 1453 1454 bind(profile_continue); 1455 } 1456 } 1457 1458 1459 void InterpreterMacroAssembler::profile_typecheck_failed(Register mdp) { 1460 if (ProfileInterpreter && TypeProfileCasts) { 1461 Label profile_continue; 1462 1463 // If no method data exists, go to profile_continue. 1464 test_method_data_pointer(mdp, profile_continue); 1465 1466 int count_offset = in_bytes(CounterData::count_offset()); 1467 // Back up the address, since we have already bumped the mdp. 1468 count_offset -= in_bytes(VirtualCallData::virtual_call_data_size()); 1469 1470 // *Decrement* the counter. We expect to see zero or small negatives. 1471 increment_mdp_data_at(mdp, count_offset, true); 1472 1473 bind (profile_continue); 1474 } 1475 } 1476 1477 1478 void InterpreterMacroAssembler::profile_typecheck(Register mdp, Register klass, Register reg2) { 1479 if (ProfileInterpreter) { 1480 Label profile_continue; 1481 1482 // If no method data exists, go to profile_continue. 1483 test_method_data_pointer(mdp, profile_continue); 1484 1485 // The method data pointer needs to be updated. 1486 int mdp_delta = in_bytes(BitData::bit_data_size()); 1487 if (TypeProfileCasts) { 1488 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size()); 1489 1490 // Record the object type. 1491 record_klass_in_profile(klass, mdp, reg2, false); 1492 } 1493 update_mdp_by_constant(mdp, mdp_delta); 1494 1495 bind(profile_continue); 1496 } 1497 } 1498 1499 1500 void InterpreterMacroAssembler::profile_switch_default(Register mdp) { 1501 if (ProfileInterpreter) { 1502 Label profile_continue; 1503 1504 // If no method data exists, go to profile_continue. 1505 test_method_data_pointer(mdp, profile_continue); 1506 1507 // Update the default case count 1508 increment_mdp_data_at(mdp, 1509 in_bytes(MultiBranchData::default_count_offset())); 1510 1511 // The method data pointer needs to be updated. 1512 update_mdp_by_offset(mdp, 1513 in_bytes(MultiBranchData:: 1514 default_displacement_offset())); 1515 1516 bind(profile_continue); 1517 } 1518 } 1519 1520 1521 void InterpreterMacroAssembler::profile_switch_case(Register index, 1522 Register mdp, 1523 Register reg2) { 1524 if (ProfileInterpreter) { 1525 Label profile_continue; 1526 1527 // If no method data exists, go to profile_continue. 1528 test_method_data_pointer(mdp, profile_continue); 1529 1530 // Build the base (index * per_case_size_in_bytes()) + 1531 // case_array_offset_in_bytes() 1532 movl(reg2, in_bytes(MultiBranchData::per_case_size())); 1533 imulptr(index, reg2); // XXX l ? 1534 addptr(index, in_bytes(MultiBranchData::case_array_offset())); // XXX l ? 1535 1536 // Update the case count 1537 increment_mdp_data_at(mdp, 1538 index, 1539 in_bytes(MultiBranchData::relative_count_offset())); 1540 1541 // The method data pointer needs to be updated. 1542 update_mdp_by_offset(mdp, 1543 index, 1544 in_bytes(MultiBranchData:: 1545 relative_displacement_offset())); 1546 1547 bind(profile_continue); 1548 } 1549 } 1550 1551 1552 1553 void InterpreterMacroAssembler::verify_oop(Register reg, TosState state) { 1554 if (state == atos) { 1555 MacroAssembler::verify_oop(reg); 1556 } 1557 } 1558 1559 void InterpreterMacroAssembler::verify_FPU(int stack_depth, TosState state) { 1560 } 1561 #endif // !CC_INTERP 1562 1563 1564 void InterpreterMacroAssembler::notify_method_entry() { 1565 // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to 1566 // track stack depth. If it is possible to enter interp_only_mode we add 1567 // the code to check if the event should be sent. 1568 if (JvmtiExport::can_post_interpreter_events()) { 1569 Label L; 1570 movl(rdx, Address(r15_thread, JavaThread::interp_only_mode_offset())); 1571 testl(rdx, rdx); 1572 jcc(Assembler::zero, L); 1573 call_VM(noreg, CAST_FROM_FN_PTR(address, 1574 InterpreterRuntime::post_method_entry)); 1575 bind(L); 1576 } 1577 1578 { 1579 SkipIfEqual skip(this, &DTraceMethodProbes, false); 1580 get_method(c_rarg1); 1581 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), 1582 r15_thread, c_rarg1); 1583 } 1584 1585 // RedefineClasses() tracing support for obsolete method entry 1586 if (RC_TRACE_IN_RANGE(0x00001000, 0x00002000)) { 1587 get_method(c_rarg1); 1588 call_VM_leaf( 1589 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry), 1590 r15_thread, c_rarg1); 1591 } 1592 } 1593 1594 1595 void InterpreterMacroAssembler::notify_method_exit( 1596 TosState state, NotifyMethodExitMode mode) { 1597 // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to 1598 // track stack depth. If it is possible to enter interp_only_mode we add 1599 // the code to check if the event should be sent. 1600 if (mode == NotifyJVMTI && JvmtiExport::can_post_interpreter_events()) { 1601 Label L; 1602 // Note: frame::interpreter_frame_result has a dependency on how the 1603 // method result is saved across the call to post_method_exit. If this 1604 // is changed then the interpreter_frame_result implementation will 1605 // need to be updated too. 1606 1607 // For c++ interpreter the result is always stored at a known location in the frame 1608 // template interpreter will leave it on the top of the stack. 1609 NOT_CC_INTERP(push(state);) 1610 movl(rdx, Address(r15_thread, JavaThread::interp_only_mode_offset())); 1611 testl(rdx, rdx); 1612 jcc(Assembler::zero, L); 1613 call_VM(noreg, 1614 CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit)); 1615 bind(L); 1616 NOT_CC_INTERP(pop(state)); 1617 } 1618 1619 { 1620 SkipIfEqual skip(this, &DTraceMethodProbes, false); 1621 NOT_CC_INTERP(push(state)); 1622 get_method(c_rarg1); 1623 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), 1624 r15_thread, c_rarg1); 1625 NOT_CC_INTERP(pop(state)); 1626 } 1627 } 1628 1629 // Jump if ((*counter_addr += increment) & mask) satisfies the condition. 1630 void InterpreterMacroAssembler::increment_mask_and_jump(Address counter_addr, 1631 int increment, int mask, 1632 Register scratch, bool preloaded, 1633 Condition cond, Label* where) { 1634 if (!preloaded) { 1635 movl(scratch, counter_addr); 1636 } 1637 incrementl(scratch, increment); 1638 movl(counter_addr, scratch); 1639 andl(scratch, mask); 1640 jcc(cond, *where); 1641 }