1 /* 2 * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, Red Hat Inc. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "interp_masm_aarch64.hpp" 28 #include "interpreter/interpreter.hpp" 29 #include "interpreter/interpreterRuntime.hpp" 30 #include "oops/arrayOop.hpp" 31 #include "oops/markOop.hpp" 32 #include "oops/methodData.hpp" 33 #include "oops/method.hpp" 34 #include "prims/jvmtiExport.hpp" 35 #include "prims/jvmtiRedefineClassesTrace.hpp" 36 #include "prims/jvmtiThreadState.hpp" 37 #include "runtime/basicLock.hpp" 38 #include "runtime/biasedLocking.hpp" 39 #include "runtime/sharedRuntime.hpp" 40 #include "runtime/thread.inline.hpp" 41 42 43 // Implementation of InterpreterMacroAssembler 44 45 void InterpreterMacroAssembler::jump_to_entry(address entry) { 46 assert(entry, "Entry must have been generated by now"); 47 b(entry); 48 } 49 50 void InterpreterMacroAssembler::check_and_handle_popframe(Register java_thread) { 51 if (JvmtiExport::can_pop_frame()) { 52 Label L; 53 // Initiate popframe handling only if it is not already being 54 // processed. If the flag has the popframe_processing bit set, it 55 // means that this code is called *during* popframe handling - we 56 // don't want to reenter. 57 // This method is only called just after the call into the vm in 58 // call_VM_base, so the arg registers are available. 59 ldrw(rscratch1, Address(rthread, JavaThread::popframe_condition_offset())); 60 tstw(rscratch1, JavaThread::popframe_pending_bit); 61 br(Assembler::EQ, L); 62 tstw(rscratch1, JavaThread::popframe_processing_bit); 63 br(Assembler::NE, L); 64 // Call Interpreter::remove_activation_preserving_args_entry() to get the 65 // address of the same-named entrypoint in the generated interpreter code. 66 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_preserving_args_entry)); 67 br(r0); 68 bind(L); 69 } 70 } 71 72 73 void InterpreterMacroAssembler::load_earlyret_value(TosState state) { 74 ldr(r2, Address(rthread, JavaThread::jvmti_thread_state_offset())); 75 const Address tos_addr(r2, JvmtiThreadState::earlyret_tos_offset()); 76 const Address oop_addr(r2, JvmtiThreadState::earlyret_oop_offset()); 77 const Address val_addr(r2, JvmtiThreadState::earlyret_value_offset()); 78 switch (state) { 79 case atos: ldr(r0, oop_addr); 80 str(zr, oop_addr); 81 verify_oop(r0, state); break; 82 case ltos: ldr(r0, val_addr); break; 83 case btos: // fall through 84 case ctos: // fall through 85 case stos: // fall through 86 case itos: ldrw(r0, val_addr); break; 87 case ftos: ldrs(v0, val_addr); break; 88 case dtos: ldrd(v0, val_addr); break; 89 case vtos: /* nothing to do */ break; 90 default : ShouldNotReachHere(); 91 } 92 // Clean up tos value in the thread object 93 movw(rscratch1, (int) ilgl); 94 strw(rscratch1, tos_addr); 95 strw(zr, val_addr); 96 } 97 98 99 void InterpreterMacroAssembler::check_and_handle_earlyret(Register java_thread) { 100 if (JvmtiExport::can_force_early_return()) { 101 Label L; 102 ldr(rscratch1, Address(rthread, JavaThread::jvmti_thread_state_offset())); 103 cbz(rscratch1, L); // if (thread->jvmti_thread_state() == NULL) exit; 104 105 // Initiate earlyret handling only if it is not already being processed. 106 // If the flag has the earlyret_processing bit set, it means that this code 107 // is called *during* earlyret handling - we don't want to reenter. 108 ldrw(rscratch1, Address(rscratch1, JvmtiThreadState::earlyret_state_offset())); 109 cmpw(rscratch1, JvmtiThreadState::earlyret_pending); 110 br(Assembler::NE, L); 111 112 // Call Interpreter::remove_activation_early_entry() to get the address of the 113 // same-named entrypoint in the generated interpreter code. 114 ldr(rscratch1, Address(rthread, JavaThread::jvmti_thread_state_offset())); 115 ldrw(rscratch1, Address(rscratch1, JvmtiThreadState::earlyret_tos_offset())); 116 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_early_entry), rscratch1); 117 br(r0); 118 bind(L); 119 } 120 } 121 122 void InterpreterMacroAssembler::get_unsigned_2_byte_index_at_bcp( 123 Register reg, 124 int bcp_offset) { 125 assert(bcp_offset >= 0, "bcp is still pointing to start of bytecode"); 126 ldrh(reg, Address(rbcp, bcp_offset)); 127 rev16(reg, reg); 128 } 129 130 void InterpreterMacroAssembler::get_dispatch() { 131 unsigned long offset; 132 adrp(rdispatch, ExternalAddress((address)Interpreter::dispatch_table()), offset); 133 lea(rdispatch, Address(rdispatch, offset)); 134 } 135 136 void InterpreterMacroAssembler::get_cache_index_at_bcp(Register index, 137 int bcp_offset, 138 size_t index_size) { 139 assert(bcp_offset > 0, "bcp is still pointing to start of bytecode"); 140 if (index_size == sizeof(u2)) { 141 load_unsigned_short(index, Address(rbcp, bcp_offset)); 142 } else if (index_size == sizeof(u4)) { 143 // assert(EnableInvokeDynamic, "giant index used only for JSR 292"); 144 ldrw(index, Address(rbcp, bcp_offset)); 145 // Check if the secondary index definition is still ~x, otherwise 146 // we have to change the following assembler code to calculate the 147 // plain index. 148 assert(ConstantPool::decode_invokedynamic_index(~123) == 123, "else change next line"); 149 eonw(index, index, zr); // convert to plain index 150 } else if (index_size == sizeof(u1)) { 151 load_unsigned_byte(index, Address(rbcp, bcp_offset)); 152 } else { 153 ShouldNotReachHere(); 154 } 155 } 156 157 // Return 158 // Rindex: index into constant pool 159 // Rcache: address of cache entry - ConstantPoolCache::base_offset() 160 // 161 // A caller must add ConstantPoolCache::base_offset() to Rcache to get 162 // the true address of the cache entry. 163 // 164 void InterpreterMacroAssembler::get_cache_and_index_at_bcp(Register cache, 165 Register index, 166 int bcp_offset, 167 size_t index_size) { 168 assert_different_registers(cache, index); 169 assert_different_registers(cache, rcpool); 170 get_cache_index_at_bcp(index, bcp_offset, index_size); 171 assert(sizeof(ConstantPoolCacheEntry) == 4 * wordSize, "adjust code below"); 172 // convert from field index to ConstantPoolCacheEntry 173 // aarch64 already has the cache in rcpool so there is no need to 174 // install it in cache. instead we pre-add the indexed offset to 175 // rcpool and return it in cache. All clients of this method need to 176 // be modified accordingly. 177 add(cache, rcpool, index, Assembler::LSL, 5); 178 } 179 180 181 void InterpreterMacroAssembler::get_cache_and_index_and_bytecode_at_bcp(Register cache, 182 Register index, 183 Register bytecode, 184 int byte_no, 185 int bcp_offset, 186 size_t index_size) { 187 get_cache_and_index_at_bcp(cache, index, bcp_offset, index_size); 188 // We use a 32-bit load here since the layout of 64-bit words on 189 // little-endian machines allow us that. 190 // n.b. unlike x86 cache already includes the index offset 191 lea(bytecode, Address(cache, 192 ConstantPoolCache::base_offset() 193 + ConstantPoolCacheEntry::indices_offset())); 194 ldarw(bytecode, bytecode); 195 const int shift_count = (1 + byte_no) * BitsPerByte; 196 ubfx(bytecode, bytecode, shift_count, BitsPerByte); 197 } 198 199 void InterpreterMacroAssembler::get_cache_entry_pointer_at_bcp(Register cache, 200 Register tmp, 201 int bcp_offset, 202 size_t index_size) { 203 assert(cache != tmp, "must use different register"); 204 get_cache_index_at_bcp(tmp, bcp_offset, index_size); 205 assert(sizeof(ConstantPoolCacheEntry) == 4 * wordSize, "adjust code below"); 206 // convert from field index to ConstantPoolCacheEntry index 207 // and from word offset to byte offset 208 assert(exact_log2(in_bytes(ConstantPoolCacheEntry::size_in_bytes())) == 2 + LogBytesPerWord, "else change next line"); 209 ldr(cache, Address(rfp, frame::interpreter_frame_cache_offset * wordSize)); 210 // skip past the header 211 add(cache, cache, in_bytes(ConstantPoolCache::base_offset())); 212 add(cache, cache, tmp, Assembler::LSL, 2 + LogBytesPerWord); // construct pointer to cache entry 213 } 214 215 void InterpreterMacroAssembler::get_method_counters(Register method, 216 Register mcs, Label& skip) { 217 Label has_counters; 218 ldr(mcs, Address(method, Method::method_counters_offset())); 219 cbnz(mcs, has_counters); 220 call_VM(noreg, CAST_FROM_FN_PTR(address, 221 InterpreterRuntime::build_method_counters), method); 222 ldr(mcs, Address(method, Method::method_counters_offset())); 223 cbz(mcs, skip); // No MethodCounters allocated, OutOfMemory 224 bind(has_counters); 225 } 226 227 // Load object from cpool->resolved_references(index) 228 void InterpreterMacroAssembler::load_resolved_reference_at_index( 229 Register result, Register index) { 230 assert_different_registers(result, index); 231 // convert from field index to resolved_references() index and from 232 // word index to byte offset. Since this is a java object, it can be compressed 233 Register tmp = index; // reuse 234 lslw(tmp, tmp, LogBytesPerHeapOop); 235 236 get_constant_pool(result); 237 // load pointer for resolved_references[] objArray 238 ldr(result, Address(result, ConstantPool::resolved_references_offset_in_bytes())); 239 // JNIHandles::resolve(obj); 240 ldr(result, Address(result, 0)); 241 // Add in the index 242 add(result, result, tmp); 243 load_heap_oop(result, Address(result, arrayOopDesc::base_offset_in_bytes(T_OBJECT))); 244 } 245 246 // Generate a subtype check: branch to ok_is_subtype if sub_klass is a 247 // subtype of super_klass. 248 // 249 // Args: 250 // r0: superklass 251 // Rsub_klass: subklass 252 // 253 // Kills: 254 // r2, r5 255 void InterpreterMacroAssembler::gen_subtype_check(Register Rsub_klass, 256 Label& ok_is_subtype) { 257 assert(Rsub_klass != r0, "r0 holds superklass"); 258 assert(Rsub_klass != r2, "r2 holds 2ndary super array length"); 259 assert(Rsub_klass != r5, "r5 holds 2ndary super array scan ptr"); 260 261 // Profile the not-null value's klass. 262 profile_typecheck(r2, Rsub_klass, r5); // blows r2, reloads r5 263 264 // Do the check. 265 check_klass_subtype(Rsub_klass, r0, r2, ok_is_subtype); // blows r2 266 267 // Profile the failure of the check. 268 profile_typecheck_failed(r2); // blows r2 269 } 270 271 // Java Expression Stack 272 273 void InterpreterMacroAssembler::pop_ptr(Register r) { 274 ldr(r, post(esp, wordSize)); 275 } 276 277 void InterpreterMacroAssembler::pop_i(Register r) { 278 ldrw(r, post(esp, wordSize)); 279 } 280 281 void InterpreterMacroAssembler::pop_l(Register r) { 282 ldr(r, post(esp, 2 * Interpreter::stackElementSize)); 283 } 284 285 void InterpreterMacroAssembler::push_ptr(Register r) { 286 str(r, pre(esp, -wordSize)); 287 } 288 289 void InterpreterMacroAssembler::push_i(Register r) { 290 str(r, pre(esp, -wordSize)); 291 } 292 293 void InterpreterMacroAssembler::push_l(Register r) { 294 str(r, pre(esp, 2 * -wordSize)); 295 } 296 297 void InterpreterMacroAssembler::pop_f(FloatRegister r) { 298 ldrs(r, post(esp, wordSize)); 299 } 300 301 void InterpreterMacroAssembler::pop_d(FloatRegister r) { 302 ldrd(r, post(esp, 2 * Interpreter::stackElementSize)); 303 } 304 305 void InterpreterMacroAssembler::push_f(FloatRegister r) { 306 strs(r, pre(esp, -wordSize)); 307 } 308 309 void InterpreterMacroAssembler::push_d(FloatRegister r) { 310 strd(r, pre(esp, 2* -wordSize)); 311 } 312 313 void InterpreterMacroAssembler::pop(TosState state) { 314 switch (state) { 315 case atos: pop_ptr(); break; 316 case btos: 317 case ctos: 318 case stos: 319 case itos: pop_i(); break; 320 case ltos: pop_l(); break; 321 case ftos: pop_f(); break; 322 case dtos: pop_d(); break; 323 case vtos: /* nothing to do */ break; 324 default: ShouldNotReachHere(); 325 } 326 verify_oop(r0, state); 327 } 328 329 void InterpreterMacroAssembler::push(TosState state) { 330 verify_oop(r0, state); 331 switch (state) { 332 case atos: push_ptr(); break; 333 case btos: 334 case ctos: 335 case stos: 336 case itos: push_i(); break; 337 case ltos: push_l(); break; 338 case ftos: push_f(); break; 339 case dtos: push_d(); break; 340 case vtos: /* nothing to do */ break; 341 default : ShouldNotReachHere(); 342 } 343 } 344 345 // Helpers for swap and dup 346 void InterpreterMacroAssembler::load_ptr(int n, Register val) { 347 ldr(val, Address(esp, Interpreter::expr_offset_in_bytes(n))); 348 } 349 350 void InterpreterMacroAssembler::store_ptr(int n, Register val) { 351 str(val, Address(esp, Interpreter::expr_offset_in_bytes(n))); 352 } 353 354 355 void InterpreterMacroAssembler::prepare_to_jump_from_interpreted() { 356 // set sender sp 357 mov(r13, sp); 358 // record last_sp 359 str(esp, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); 360 } 361 362 // Jump to from_interpreted entry of a call unless single stepping is possible 363 // in this thread in which case we must call the i2i entry 364 void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) { 365 prepare_to_jump_from_interpreted(); 366 367 if (JvmtiExport::can_post_interpreter_events()) { 368 Label run_compiled_code; 369 // JVMTI events, such as single-stepping, are implemented partly by avoiding running 370 // compiled code in threads for which the event is enabled. Check here for 371 // interp_only_mode if these events CAN be enabled. 372 // interp_only is an int, on little endian it is sufficient to test the byte only 373 // Is a cmpl faster? 374 ldr(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset())); 375 cbz(rscratch1, run_compiled_code); 376 ldr(rscratch1, Address(method, Method::interpreter_entry_offset())); 377 br(rscratch1); 378 bind(run_compiled_code); 379 } 380 381 ldr(rscratch1, Address(method, Method::from_interpreted_offset())); 382 br(rscratch1); 383 } 384 385 // The following two routines provide a hook so that an implementation 386 // can schedule the dispatch in two parts. amd64 does not do this. 387 void InterpreterMacroAssembler::dispatch_prolog(TosState state, int step) { 388 } 389 390 void InterpreterMacroAssembler::dispatch_epilog(TosState state, int step) { 391 dispatch_next(state, step); 392 } 393 394 void InterpreterMacroAssembler::dispatch_base(TosState state, 395 address* table, 396 bool verifyoop) { 397 if (VerifyActivationFrameSize) { 398 Unimplemented(); 399 } 400 if (verifyoop) { 401 verify_oop(r0, state); 402 } 403 if (table == Interpreter::dispatch_table(state)) { 404 addw(rscratch2, rscratch1, Interpreter::distance_from_dispatch_table(state)); 405 ldr(rscratch2, Address(rdispatch, rscratch2, Address::uxtw(3))); 406 } else { 407 mov(rscratch2, (address)table); 408 ldr(rscratch2, Address(rscratch2, rscratch1, Address::uxtw(3))); 409 } 410 br(rscratch2); 411 } 412 413 void InterpreterMacroAssembler::dispatch_only(TosState state) { 414 dispatch_base(state, Interpreter::dispatch_table(state)); 415 } 416 417 void InterpreterMacroAssembler::dispatch_only_normal(TosState state) { 418 dispatch_base(state, Interpreter::normal_table(state)); 419 } 420 421 void InterpreterMacroAssembler::dispatch_only_noverify(TosState state) { 422 dispatch_base(state, Interpreter::normal_table(state), false); 423 } 424 425 426 void InterpreterMacroAssembler::dispatch_next(TosState state, int step) { 427 // load next bytecode 428 ldrb(rscratch1, Address(pre(rbcp, step))); 429 dispatch_base(state, Interpreter::dispatch_table(state)); 430 } 431 432 void InterpreterMacroAssembler::dispatch_via(TosState state, address* table) { 433 // load current bytecode 434 ldrb(rscratch1, Address(rbcp, 0)); 435 dispatch_base(state, table); 436 } 437 438 // remove activation 439 // 440 // Unlock the receiver if this is a synchronized method. 441 // Unlock any Java monitors from syncronized blocks. 442 // Remove the activation from the stack. 443 // 444 // If there are locked Java monitors 445 // If throw_monitor_exception 446 // throws IllegalMonitorStateException 447 // Else if install_monitor_exception 448 // installs IllegalMonitorStateException 449 // Else 450 // no error processing 451 void InterpreterMacroAssembler::remove_activation( 452 TosState state, 453 bool throw_monitor_exception, 454 bool install_monitor_exception, 455 bool notify_jvmdi) { 456 // Note: Registers r3 xmm0 may be in use for the 457 // result check if synchronized method 458 Label unlocked, unlock, no_unlock; 459 460 // get the value of _do_not_unlock_if_synchronized into r3 461 const Address do_not_unlock_if_synchronized(rthread, 462 in_bytes(JavaThread::do_not_unlock_if_synchronized_offset())); 463 ldrb(r3, do_not_unlock_if_synchronized); 464 strb(zr, do_not_unlock_if_synchronized); // reset the flag 465 466 // get method access flags 467 ldr(r1, Address(rfp, frame::interpreter_frame_method_offset * wordSize)); 468 ldr(r2, Address(r1, Method::access_flags_offset())); 469 tst(r2, JVM_ACC_SYNCHRONIZED); 470 br(Assembler::EQ, unlocked); 471 472 // Don't unlock anything if the _do_not_unlock_if_synchronized flag 473 // is set. 474 cbnz(r3, no_unlock); 475 476 // unlock monitor 477 push(state); // save result 478 479 // BasicObjectLock will be first in list, since this is a 480 // synchronized method. However, need to check that the object has 481 // not been unlocked by an explicit monitorexit bytecode. 482 const Address monitor(rfp, frame::interpreter_frame_initial_sp_offset * 483 wordSize - (int) sizeof(BasicObjectLock)); 484 // We use c_rarg1 so that if we go slow path it will be the correct 485 // register for unlock_object to pass to VM directly 486 lea(c_rarg1, monitor); // address of first monitor 487 488 ldr(r0, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes())); 489 cbnz(r0, unlock); 490 491 pop(state); 492 if (throw_monitor_exception) { 493 // Entry already unlocked, need to throw exception 494 call_VM(noreg, CAST_FROM_FN_PTR(address, 495 InterpreterRuntime::throw_illegal_monitor_state_exception)); 496 should_not_reach_here(); 497 } else { 498 // Monitor already unlocked during a stack unroll. If requested, 499 // install an illegal_monitor_state_exception. Continue with 500 // stack unrolling. 501 if (install_monitor_exception) { 502 call_VM(noreg, CAST_FROM_FN_PTR(address, 503 InterpreterRuntime::new_illegal_monitor_state_exception)); 504 } 505 b(unlocked); 506 } 507 508 bind(unlock); 509 unlock_object(c_rarg1); 510 pop(state); 511 512 // Check that for block-structured locking (i.e., that all locked 513 // objects has been unlocked) 514 bind(unlocked); 515 516 // r0: Might contain return value 517 518 // Check that all monitors are unlocked 519 { 520 Label loop, exception, entry, restart; 521 const int entry_size = frame::interpreter_frame_monitor_size() * wordSize; 522 const Address monitor_block_top( 523 rfp, frame::interpreter_frame_monitor_block_top_offset * wordSize); 524 const Address monitor_block_bot( 525 rfp, frame::interpreter_frame_initial_sp_offset * wordSize); 526 527 bind(restart); 528 // We use c_rarg1 so that if we go slow path it will be the correct 529 // register for unlock_object to pass to VM directly 530 ldr(c_rarg1, monitor_block_top); // points to current entry, starting 531 // with top-most entry 532 lea(r19, monitor_block_bot); // points to word before bottom of 533 // monitor block 534 b(entry); 535 536 // Entry already locked, need to throw exception 537 bind(exception); 538 539 if (throw_monitor_exception) { 540 // Throw exception 541 MacroAssembler::call_VM(noreg, 542 CAST_FROM_FN_PTR(address, InterpreterRuntime:: 543 throw_illegal_monitor_state_exception)); 544 should_not_reach_here(); 545 } else { 546 // Stack unrolling. Unlock object and install illegal_monitor_exception. 547 // Unlock does not block, so don't have to worry about the frame. 548 // We don't have to preserve c_rarg1 since we are going to throw an exception. 549 550 push(state); 551 unlock_object(c_rarg1); 552 pop(state); 553 554 if (install_monitor_exception) { 555 call_VM(noreg, CAST_FROM_FN_PTR(address, 556 InterpreterRuntime:: 557 new_illegal_monitor_state_exception)); 558 } 559 560 b(restart); 561 } 562 563 bind(loop); 564 // check if current entry is used 565 ldr(rscratch1, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes())); 566 cbnz(rscratch1, exception); 567 568 add(c_rarg1, c_rarg1, entry_size); // otherwise advance to next entry 569 bind(entry); 570 cmp(c_rarg1, r19); // check if bottom reached 571 br(Assembler::NE, loop); // if not at bottom then check this entry 572 } 573 574 bind(no_unlock); 575 576 // jvmti support 577 if (notify_jvmdi) { 578 notify_method_exit(state, NotifyJVMTI); // preserve TOSCA 579 } else { 580 notify_method_exit(state, SkipNotifyJVMTI); // preserve TOSCA 581 } 582 583 // remove activation 584 // get sender esp 585 ldr(esp, 586 Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); 587 // remove frame anchor 588 leave(); 589 // If we're returning to interpreted code we will shortly be 590 // adjusting SP to allow some space for ESP. If we're returning to 591 // compiled code the saved sender SP was saved in sender_sp, so this 592 // restores it. 593 andr(sp, esp, -16); 594 } 595 596 // Lock object 597 // 598 // Args: 599 // c_rarg1: BasicObjectLock to be used for locking 600 // 601 // Kills: 602 // r0 603 // c_rarg0, c_rarg1, c_rarg2, c_rarg3, .. (param regs) 604 // rscratch1, rscratch2 (scratch regs) 605 void InterpreterMacroAssembler::lock_object(Register lock_reg) 606 { 607 assert(lock_reg == c_rarg1, "The argument is only for looks. It must be c_rarg1"); 608 if (UseHeavyMonitors) { 609 call_VM(noreg, 610 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), 611 lock_reg); 612 } else { 613 Label done; 614 615 const Register swap_reg = r0; 616 const Register tmp = c_rarg2; 617 const Register obj_reg = c_rarg3; // Will contain the oop 618 619 const int obj_offset = BasicObjectLock::obj_offset_in_bytes(); 620 const int lock_offset = BasicObjectLock::lock_offset_in_bytes (); 621 const int mark_offset = lock_offset + 622 BasicLock::displaced_header_offset_in_bytes(); 623 624 Label slow_case; 625 626 // Load object pointer into obj_reg %c_rarg3 627 ldr(obj_reg, Address(lock_reg, obj_offset)); 628 629 if (UseBiasedLocking) { 630 biased_locking_enter(lock_reg, obj_reg, swap_reg, tmp, false, done, &slow_case); 631 } 632 633 // Load (object->mark() | 1) into swap_reg 634 ldr(rscratch1, Address(obj_reg, 0)); 635 orr(swap_reg, rscratch1, 1); 636 637 // Save (object->mark() | 1) into BasicLock's displaced header 638 str(swap_reg, Address(lock_reg, mark_offset)); 639 640 assert(lock_offset == 0, 641 "displached header must be first word in BasicObjectLock"); 642 643 Label fail; 644 if (PrintBiasedLockingStatistics) { 645 Label fast; 646 cmpxchgptr(swap_reg, lock_reg, obj_reg, rscratch1, fast, &fail); 647 bind(fast); 648 atomic_incw(Address((address)BiasedLocking::fast_path_entry_count_addr()), 649 rscratch2, rscratch1, tmp); 650 b(done); 651 bind(fail); 652 } else { 653 cmpxchgptr(swap_reg, lock_reg, obj_reg, rscratch1, done, /*fallthrough*/NULL); 654 } 655 656 // Test if the oopMark is an obvious stack pointer, i.e., 657 // 1) (mark & 7) == 0, and 658 // 2) rsp <= mark < mark + os::pagesize() 659 // 660 // These 3 tests can be done by evaluating the following 661 // expression: ((mark - rsp) & (7 - os::vm_page_size())), 662 // assuming both stack pointer and pagesize have their 663 // least significant 3 bits clear. 664 // NOTE: the oopMark is in swap_reg %r0 as the result of cmpxchg 665 // NOTE2: aarch64 does not like to subtract sp from rn so take a 666 // copy 667 mov(rscratch1, sp); 668 sub(swap_reg, swap_reg, rscratch1); 669 ands(swap_reg, swap_reg, (unsigned long)(7 - os::vm_page_size())); 670 671 // Save the test result, for recursive case, the result is zero 672 str(swap_reg, Address(lock_reg, mark_offset)); 673 674 if (PrintBiasedLockingStatistics) { 675 br(Assembler::NE, slow_case); 676 atomic_incw(Address((address)BiasedLocking::fast_path_entry_count_addr()), 677 rscratch2, rscratch1, tmp); 678 } 679 br(Assembler::EQ, done); 680 681 bind(slow_case); 682 683 // Call the runtime routine for slow case 684 call_VM(noreg, 685 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), 686 lock_reg); 687 688 bind(done); 689 } 690 } 691 692 693 // Unlocks an object. Used in monitorexit bytecode and 694 // remove_activation. Throws an IllegalMonitorException if object is 695 // not locked by current thread. 696 // 697 // Args: 698 // c_rarg1: BasicObjectLock for lock 699 // 700 // Kills: 701 // r0 702 // c_rarg0, c_rarg1, c_rarg2, c_rarg3, ... (param regs) 703 // rscratch1, rscratch2 (scratch regs) 704 void InterpreterMacroAssembler::unlock_object(Register lock_reg) 705 { 706 assert(lock_reg == c_rarg1, "The argument is only for looks. It must be rarg1"); 707 708 if (UseHeavyMonitors) { 709 call_VM(noreg, 710 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), 711 lock_reg); 712 } else { 713 Label done; 714 715 const Register swap_reg = r0; 716 const Register header_reg = c_rarg2; // Will contain the old oopMark 717 const Register obj_reg = c_rarg3; // Will contain the oop 718 719 save_bcp(); // Save in case of exception 720 721 // Convert from BasicObjectLock structure to object and BasicLock 722 // structure Store the BasicLock address into %r0 723 lea(swap_reg, Address(lock_reg, BasicObjectLock::lock_offset_in_bytes())); 724 725 // Load oop into obj_reg(%c_rarg3) 726 ldr(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes())); 727 728 // Free entry 729 str(zr, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes())); 730 731 if (UseBiasedLocking) { 732 biased_locking_exit(obj_reg, header_reg, done); 733 } 734 735 // Load the old header from BasicLock structure 736 ldr(header_reg, Address(swap_reg, 737 BasicLock::displaced_header_offset_in_bytes())); 738 739 // Test for recursion 740 cbz(header_reg, done); 741 742 // Atomic swap back the old header 743 cmpxchgptr(swap_reg, header_reg, obj_reg, rscratch1, done, /*fallthrough*/NULL); 744 745 // Call the runtime routine for slow case. 746 str(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes())); // restore obj 747 call_VM(noreg, 748 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), 749 lock_reg); 750 751 bind(done); 752 753 restore_bcp(); 754 } 755 } 756 757 void InterpreterMacroAssembler::test_method_data_pointer(Register mdp, 758 Label& zero_continue) { 759 assert(ProfileInterpreter, "must be profiling interpreter"); 760 ldr(mdp, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); 761 cbz(mdp, zero_continue); 762 } 763 764 // Set the method data pointer for the current bcp. 765 void InterpreterMacroAssembler::set_method_data_pointer_for_bcp() { 766 assert(ProfileInterpreter, "must be profiling interpreter"); 767 Label set_mdp; 768 stp(r0, r1, Address(pre(sp, -2 * wordSize))); 769 770 // Test MDO to avoid the call if it is NULL. 771 ldr(r0, Address(rmethod, in_bytes(Method::method_data_offset()))); 772 cbz(r0, set_mdp); 773 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), rmethod, rbcp); 774 // r0: mdi 775 // mdo is guaranteed to be non-zero here, we checked for it before the call. 776 ldr(r1, Address(rmethod, in_bytes(Method::method_data_offset()))); 777 lea(r1, Address(r1, in_bytes(MethodData::data_offset()))); 778 add(r0, r1, r0); 779 str(r0, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); 780 bind(set_mdp); 781 ldp(r0, r1, Address(post(sp, 2 * wordSize))); 782 } 783 784 void InterpreterMacroAssembler::verify_method_data_pointer() { 785 assert(ProfileInterpreter, "must be profiling interpreter"); 786 #ifdef ASSERT 787 Label verify_continue; 788 stp(r0, r1, Address(pre(sp, -2 * wordSize))); 789 stp(r2, r3, Address(pre(sp, -2 * wordSize))); 790 test_method_data_pointer(r3, verify_continue); // If mdp is zero, continue 791 get_method(r1); 792 793 // If the mdp is valid, it will point to a DataLayout header which is 794 // consistent with the bcp. The converse is highly probable also. 795 ldrsh(r2, Address(r3, in_bytes(DataLayout::bci_offset()))); 796 ldr(rscratch1, Address(r1, Method::const_offset())); 797 add(r2, r2, rscratch1, Assembler::LSL); 798 lea(r2, Address(r2, ConstMethod::codes_offset())); 799 cmp(r2, rbcp); 800 br(Assembler::EQ, verify_continue); 801 // r1: method 802 // rbcp: bcp // rbcp == 22 803 // r3: mdp 804 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp), 805 r1, rbcp, r3); 806 bind(verify_continue); 807 ldp(r2, r3, Address(post(sp, 2 * wordSize))); 808 ldp(r0, r1, Address(post(sp, 2 * wordSize))); 809 #endif // ASSERT 810 } 811 812 813 void InterpreterMacroAssembler::set_mdp_data_at(Register mdp_in, 814 int constant, 815 Register value) { 816 assert(ProfileInterpreter, "must be profiling interpreter"); 817 Address data(mdp_in, constant); 818 str(value, data); 819 } 820 821 822 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in, 823 int constant, 824 bool decrement) { 825 increment_mdp_data_at(mdp_in, noreg, constant, decrement); 826 } 827 828 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in, 829 Register reg, 830 int constant, 831 bool decrement) { 832 assert(ProfileInterpreter, "must be profiling interpreter"); 833 // %%% this does 64bit counters at best it is wasting space 834 // at worst it is a rare bug when counters overflow 835 836 assert_different_registers(rscratch2, rscratch1, mdp_in, reg); 837 838 Address addr1(mdp_in, constant); 839 Address addr2(rscratch2, reg, Address::lsl(0)); 840 Address &addr = addr1; 841 if (reg != noreg) { 842 lea(rscratch2, addr1); 843 addr = addr2; 844 } 845 846 if (decrement) { 847 // Decrement the register. Set condition codes. 848 // Intel does this 849 // addptr(data, (int32_t) -DataLayout::counter_increment); 850 // If the decrement causes the counter to overflow, stay negative 851 // Label L; 852 // jcc(Assembler::negative, L); 853 // addptr(data, (int32_t) DataLayout::counter_increment); 854 // so we do this 855 ldr(rscratch1, addr); 856 subs(rscratch1, rscratch1, (unsigned)DataLayout::counter_increment); 857 Label L; 858 br(Assembler::LO, L); // skip store if counter underflow 859 str(rscratch1, addr); 860 bind(L); 861 } else { 862 assert(DataLayout::counter_increment == 1, 863 "flow-free idiom only works with 1"); 864 // Intel does this 865 // Increment the register. Set carry flag. 866 // addptr(data, DataLayout::counter_increment); 867 // If the increment causes the counter to overflow, pull back by 1. 868 // sbbptr(data, (int32_t)0); 869 // so we do this 870 ldr(rscratch1, addr); 871 adds(rscratch1, rscratch1, DataLayout::counter_increment); 872 Label L; 873 br(Assembler::CS, L); // skip store if counter overflow 874 str(rscratch1, addr); 875 bind(L); 876 } 877 } 878 879 void InterpreterMacroAssembler::set_mdp_flag_at(Register mdp_in, 880 int flag_byte_constant) { 881 assert(ProfileInterpreter, "must be profiling interpreter"); 882 int header_offset = in_bytes(DataLayout::header_offset()); 883 int header_bits = DataLayout::flag_mask_to_header_mask(flag_byte_constant); 884 // Set the flag 885 ldr(rscratch1, Address(mdp_in, header_offset)); 886 orr(rscratch1, rscratch1, header_bits); 887 str(rscratch1, Address(mdp_in, header_offset)); 888 } 889 890 891 void InterpreterMacroAssembler::test_mdp_data_at(Register mdp_in, 892 int offset, 893 Register value, 894 Register test_value_out, 895 Label& not_equal_continue) { 896 assert(ProfileInterpreter, "must be profiling interpreter"); 897 if (test_value_out == noreg) { 898 ldr(rscratch1, Address(mdp_in, offset)); 899 cmp(value, rscratch1); 900 } else { 901 // Put the test value into a register, so caller can use it: 902 ldr(test_value_out, Address(mdp_in, offset)); 903 cmp(value, test_value_out); 904 } 905 br(Assembler::NE, not_equal_continue); 906 } 907 908 909 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in, 910 int offset_of_disp) { 911 assert(ProfileInterpreter, "must be profiling interpreter"); 912 ldr(rscratch1, Address(mdp_in, offset_of_disp)); 913 add(mdp_in, mdp_in, rscratch1, LSL); 914 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); 915 } 916 917 918 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in, 919 Register reg, 920 int offset_of_disp) { 921 assert(ProfileInterpreter, "must be profiling interpreter"); 922 lea(rscratch1, Address(mdp_in, offset_of_disp)); 923 ldr(rscratch1, Address(rscratch1, reg, Address::lsl(0))); 924 add(mdp_in, mdp_in, rscratch1, LSL); 925 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); 926 } 927 928 929 void InterpreterMacroAssembler::update_mdp_by_constant(Register mdp_in, 930 int constant) { 931 assert(ProfileInterpreter, "must be profiling interpreter"); 932 add(mdp_in, mdp_in, (unsigned)constant); 933 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); 934 } 935 936 937 void InterpreterMacroAssembler::update_mdp_for_ret(Register return_bci) { 938 assert(ProfileInterpreter, "must be profiling interpreter"); 939 // save/restore across call_VM 940 stp(zr, return_bci, Address(pre(sp, -2 * wordSize))); 941 call_VM(noreg, 942 CAST_FROM_FN_PTR(address, InterpreterRuntime::update_mdp_for_ret), 943 return_bci); 944 ldp(zr, return_bci, Address(post(sp, 2 * wordSize))); 945 } 946 947 948 void InterpreterMacroAssembler::profile_taken_branch(Register mdp, 949 Register bumped_count) { 950 if (ProfileInterpreter) { 951 Label profile_continue; 952 953 // If no method data exists, go to profile_continue. 954 // Otherwise, assign to mdp 955 test_method_data_pointer(mdp, profile_continue); 956 957 // We are taking a branch. Increment the taken count. 958 // We inline increment_mdp_data_at to return bumped_count in a register 959 //increment_mdp_data_at(mdp, in_bytes(JumpData::taken_offset())); 960 Address data(mdp, in_bytes(JumpData::taken_offset())); 961 ldr(bumped_count, data); 962 assert(DataLayout::counter_increment == 1, 963 "flow-free idiom only works with 1"); 964 // Intel does this to catch overflow 965 // addptr(bumped_count, DataLayout::counter_increment); 966 // sbbptr(bumped_count, 0); 967 // so we do this 968 adds(bumped_count, bumped_count, DataLayout::counter_increment); 969 Label L; 970 br(Assembler::CS, L); // skip store if counter overflow 971 str(bumped_count, data); 972 bind(L); 973 // The method data pointer needs to be updated to reflect the new target. 974 update_mdp_by_offset(mdp, in_bytes(JumpData::displacement_offset())); 975 bind(profile_continue); 976 } 977 } 978 979 980 void InterpreterMacroAssembler::profile_not_taken_branch(Register mdp) { 981 if (ProfileInterpreter) { 982 Label profile_continue; 983 984 // If no method data exists, go to profile_continue. 985 test_method_data_pointer(mdp, profile_continue); 986 987 // We are taking a branch. Increment the not taken count. 988 increment_mdp_data_at(mdp, in_bytes(BranchData::not_taken_offset())); 989 990 // The method data pointer needs to be updated to correspond to 991 // the next bytecode 992 update_mdp_by_constant(mdp, in_bytes(BranchData::branch_data_size())); 993 bind(profile_continue); 994 } 995 } 996 997 998 void InterpreterMacroAssembler::profile_call(Register mdp) { 999 if (ProfileInterpreter) { 1000 Label profile_continue; 1001 1002 // If no method data exists, go to profile_continue. 1003 test_method_data_pointer(mdp, profile_continue); 1004 1005 // We are making a call. Increment the count. 1006 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1007 1008 // The method data pointer needs to be updated to reflect the new target. 1009 update_mdp_by_constant(mdp, in_bytes(CounterData::counter_data_size())); 1010 bind(profile_continue); 1011 } 1012 } 1013 1014 void InterpreterMacroAssembler::profile_final_call(Register mdp) { 1015 if (ProfileInterpreter) { 1016 Label profile_continue; 1017 1018 // If no method data exists, go to profile_continue. 1019 test_method_data_pointer(mdp, profile_continue); 1020 1021 // We are making a call. Increment the count. 1022 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1023 1024 // The method data pointer needs to be updated to reflect the new target. 1025 update_mdp_by_constant(mdp, 1026 in_bytes(VirtualCallData:: 1027 virtual_call_data_size())); 1028 bind(profile_continue); 1029 } 1030 } 1031 1032 1033 void InterpreterMacroAssembler::profile_virtual_call(Register receiver, 1034 Register mdp, 1035 Register reg2, 1036 bool receiver_can_be_null) { 1037 if (ProfileInterpreter) { 1038 Label profile_continue; 1039 1040 // If no method data exists, go to profile_continue. 1041 test_method_data_pointer(mdp, profile_continue); 1042 1043 Label skip_receiver_profile; 1044 if (receiver_can_be_null) { 1045 Label not_null; 1046 // We are making a call. Increment the count for null receiver. 1047 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1048 b(skip_receiver_profile); 1049 bind(not_null); 1050 } 1051 1052 // Record the receiver type. 1053 record_klass_in_profile(receiver, mdp, reg2, true); 1054 bind(skip_receiver_profile); 1055 1056 // The method data pointer needs to be updated to reflect the new target. 1057 #if INCLUDE_JVMCI 1058 if (MethodProfileWidth == 0) { 1059 update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size())); 1060 } 1061 #else // INCLUDE_JVMCI 1062 update_mdp_by_constant(mdp, 1063 in_bytes(VirtualCallData:: 1064 virtual_call_data_size())); 1065 #endif // INCLUDE_JVMCI 1066 bind(profile_continue); 1067 } 1068 } 1069 1070 #if INCLUDE_JVMCI 1071 void InterpreterMacroAssembler::profile_called_method(Register method, Register mdp, Register reg2) { 1072 assert_different_registers(method, mdp, reg2); 1073 if (ProfileInterpreter && MethodProfileWidth > 0) { 1074 Label profile_continue; 1075 1076 // If no method data exists, go to profile_continue. 1077 test_method_data_pointer(mdp, profile_continue); 1078 1079 Label done; 1080 record_item_in_profile_helper(method, mdp, reg2, 0, done, MethodProfileWidth, 1081 &VirtualCallData::method_offset, &VirtualCallData::method_count_offset, in_bytes(VirtualCallData::nonprofiled_receiver_count_offset())); 1082 bind(done); 1083 1084 update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size())); 1085 bind(profile_continue); 1086 } 1087 } 1088 #endif // INCLUDE_JVMCI 1089 1090 // This routine creates a state machine for updating the multi-row 1091 // type profile at a virtual call site (or other type-sensitive bytecode). 1092 // The machine visits each row (of receiver/count) until the receiver type 1093 // is found, or until it runs out of rows. At the same time, it remembers 1094 // the location of the first empty row. (An empty row records null for its 1095 // receiver, and can be allocated for a newly-observed receiver type.) 1096 // Because there are two degrees of freedom in the state, a simple linear 1097 // search will not work; it must be a decision tree. Hence this helper 1098 // function is recursive, to generate the required tree structured code. 1099 // It's the interpreter, so we are trading off code space for speed. 1100 // See below for example code. 1101 void InterpreterMacroAssembler::record_klass_in_profile_helper( 1102 Register receiver, Register mdp, 1103 Register reg2, int start_row, 1104 Label& done, bool is_virtual_call) { 1105 if (TypeProfileWidth == 0) { 1106 if (is_virtual_call) { 1107 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1108 } 1109 #if INCLUDE_JVMCI 1110 else if (EnableJVMCI) { 1111 increment_mdp_data_at(mdp, in_bytes(ReceiverTypeData::nonprofiled_receiver_count_offset())); 1112 } 1113 #endif // INCLUDE_JVMCI 1114 } else { 1115 int non_profiled_offset = -1; 1116 if (is_virtual_call) { 1117 non_profiled_offset = in_bytes(CounterData::count_offset()); 1118 } 1119 #if INCLUDE_JVMCI 1120 else if (EnableJVMCI) { 1121 non_profiled_offset = in_bytes(ReceiverTypeData::nonprofiled_receiver_count_offset()); 1122 } 1123 #endif // INCLUDE_JVMCI 1124 1125 record_item_in_profile_helper(receiver, mdp, reg2, 0, done, TypeProfileWidth, 1126 &VirtualCallData::receiver_offset, &VirtualCallData::receiver_count_offset, non_profiled_offset); 1127 } 1128 } 1129 1130 void InterpreterMacroAssembler::record_item_in_profile_helper(Register item, Register mdp, 1131 Register reg2, int start_row, Label& done, int total_rows, 1132 OffsetFunction item_offset_fn, OffsetFunction item_count_offset_fn, 1133 int non_profiled_offset) { 1134 int last_row = total_rows - 1; 1135 assert(start_row <= last_row, "must be work left to do"); 1136 // Test this row for both the item and for null. 1137 // Take any of three different outcomes: 1138 // 1. found item => increment count and goto done 1139 // 2. found null => keep looking for case 1, maybe allocate this cell 1140 // 3. found something else => keep looking for cases 1 and 2 1141 // Case 3 is handled by a recursive call. 1142 for (int row = start_row; row <= last_row; row++) { 1143 Label next_test; 1144 bool test_for_null_also = (row == start_row); 1145 1146 // See if the item is item[n]. 1147 int item_offset = in_bytes(item_offset_fn(row)); 1148 test_mdp_data_at(mdp, item_offset, item, 1149 (test_for_null_also ? reg2 : noreg), 1150 next_test); 1151 // (Reg2 now contains the item from the CallData.) 1152 1153 // The item is item[n]. Increment count[n]. 1154 int count_offset = in_bytes(item_count_offset_fn(row)); 1155 increment_mdp_data_at(mdp, count_offset); 1156 b(done); 1157 bind(next_test); 1158 1159 if (test_for_null_also) { 1160 Label found_null; 1161 // Failed the equality check on item[n]... Test for null. 1162 if (start_row == last_row) { 1163 // The only thing left to do is handle the null case. 1164 if (non_profiled_offset >= 0) { 1165 cbz(reg2, found_null); 1166 // Item did not match any saved item and there is no empty row for it. 1167 // Increment total counter to indicate polymorphic case. 1168 increment_mdp_data_at(mdp, non_profiled_offset); 1169 b(done); 1170 bind(found_null); 1171 } else { 1172 cbnz(reg2, done); 1173 } 1174 break; 1175 } 1176 // Since null is rare, make it be the branch-taken case. 1177 cbz(reg2, found_null); 1178 1179 // Put all the "Case 3" tests here. 1180 record_item_in_profile_helper(item, mdp, reg2, start_row + 1, done, total_rows, 1181 item_offset_fn, item_count_offset_fn, non_profiled_offset); 1182 1183 // Found a null. Keep searching for a matching item, 1184 // but remember that this is an empty (unused) slot. 1185 bind(found_null); 1186 } 1187 } 1188 1189 // In the fall-through case, we found no matching item, but we 1190 // observed the item[start_row] is NULL. 1191 1192 // Fill in the item field and increment the count. 1193 int item_offset = in_bytes(item_offset_fn(start_row)); 1194 set_mdp_data_at(mdp, item_offset, item); 1195 int count_offset = in_bytes(item_count_offset_fn(start_row)); 1196 mov(reg2, DataLayout::counter_increment); 1197 set_mdp_data_at(mdp, count_offset, reg2); 1198 if (start_row > 0) { 1199 b(done); 1200 } 1201 } 1202 1203 // Example state machine code for three profile rows: 1204 // // main copy of decision tree, rooted at row[1] 1205 // if (row[0].rec == rec) { row[0].incr(); goto done; } 1206 // if (row[0].rec != NULL) { 1207 // // inner copy of decision tree, rooted at row[1] 1208 // if (row[1].rec == rec) { row[1].incr(); goto done; } 1209 // if (row[1].rec != NULL) { 1210 // // degenerate decision tree, rooted at row[2] 1211 // if (row[2].rec == rec) { row[2].incr(); goto done; } 1212 // if (row[2].rec != NULL) { count.incr(); goto done; } // overflow 1213 // row[2].init(rec); goto done; 1214 // } else { 1215 // // remember row[1] is empty 1216 // if (row[2].rec == rec) { row[2].incr(); goto done; } 1217 // row[1].init(rec); goto done; 1218 // } 1219 // } else { 1220 // // remember row[0] is empty 1221 // if (row[1].rec == rec) { row[1].incr(); goto done; } 1222 // if (row[2].rec == rec) { row[2].incr(); goto done; } 1223 // row[0].init(rec); goto done; 1224 // } 1225 // done: 1226 1227 void InterpreterMacroAssembler::record_klass_in_profile(Register receiver, 1228 Register mdp, Register reg2, 1229 bool is_virtual_call) { 1230 assert(ProfileInterpreter, "must be profiling"); 1231 Label done; 1232 1233 record_klass_in_profile_helper(receiver, mdp, reg2, 0, done, is_virtual_call); 1234 1235 bind (done); 1236 } 1237 1238 void InterpreterMacroAssembler::profile_ret(Register return_bci, 1239 Register mdp) { 1240 if (ProfileInterpreter) { 1241 Label profile_continue; 1242 uint row; 1243 1244 // If no method data exists, go to profile_continue. 1245 test_method_data_pointer(mdp, profile_continue); 1246 1247 // Update the total ret count. 1248 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1249 1250 for (row = 0; row < RetData::row_limit(); row++) { 1251 Label next_test; 1252 1253 // See if return_bci is equal to bci[n]: 1254 test_mdp_data_at(mdp, 1255 in_bytes(RetData::bci_offset(row)), 1256 return_bci, noreg, 1257 next_test); 1258 1259 // return_bci is equal to bci[n]. Increment the count. 1260 increment_mdp_data_at(mdp, in_bytes(RetData::bci_count_offset(row))); 1261 1262 // The method data pointer needs to be updated to reflect the new target. 1263 update_mdp_by_offset(mdp, 1264 in_bytes(RetData::bci_displacement_offset(row))); 1265 b(profile_continue); 1266 bind(next_test); 1267 } 1268 1269 update_mdp_for_ret(return_bci); 1270 1271 bind(profile_continue); 1272 } 1273 } 1274 1275 void InterpreterMacroAssembler::profile_null_seen(Register mdp) { 1276 if (ProfileInterpreter) { 1277 Label profile_continue; 1278 1279 // If no method data exists, go to profile_continue. 1280 test_method_data_pointer(mdp, profile_continue); 1281 1282 set_mdp_flag_at(mdp, BitData::null_seen_byte_constant()); 1283 1284 // The method data pointer needs to be updated. 1285 int mdp_delta = in_bytes(BitData::bit_data_size()); 1286 if (TypeProfileCasts) { 1287 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size()); 1288 } 1289 update_mdp_by_constant(mdp, mdp_delta); 1290 1291 bind(profile_continue); 1292 } 1293 } 1294 1295 void InterpreterMacroAssembler::profile_typecheck_failed(Register mdp) { 1296 if (ProfileInterpreter && TypeProfileCasts) { 1297 Label profile_continue; 1298 1299 // If no method data exists, go to profile_continue. 1300 test_method_data_pointer(mdp, profile_continue); 1301 1302 int count_offset = in_bytes(CounterData::count_offset()); 1303 // Back up the address, since we have already bumped the mdp. 1304 count_offset -= in_bytes(VirtualCallData::virtual_call_data_size()); 1305 1306 // *Decrement* the counter. We expect to see zero or small negatives. 1307 increment_mdp_data_at(mdp, count_offset, true); 1308 1309 bind (profile_continue); 1310 } 1311 } 1312 1313 void InterpreterMacroAssembler::profile_typecheck(Register mdp, Register klass, Register reg2) { 1314 if (ProfileInterpreter) { 1315 Label profile_continue; 1316 1317 // If no method data exists, go to profile_continue. 1318 test_method_data_pointer(mdp, profile_continue); 1319 1320 // The method data pointer needs to be updated. 1321 int mdp_delta = in_bytes(BitData::bit_data_size()); 1322 if (TypeProfileCasts) { 1323 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size()); 1324 1325 // Record the object type. 1326 record_klass_in_profile(klass, mdp, reg2, false); 1327 } 1328 update_mdp_by_constant(mdp, mdp_delta); 1329 1330 bind(profile_continue); 1331 } 1332 } 1333 1334 void InterpreterMacroAssembler::profile_switch_default(Register mdp) { 1335 if (ProfileInterpreter) { 1336 Label profile_continue; 1337 1338 // If no method data exists, go to profile_continue. 1339 test_method_data_pointer(mdp, profile_continue); 1340 1341 // Update the default case count 1342 increment_mdp_data_at(mdp, 1343 in_bytes(MultiBranchData::default_count_offset())); 1344 1345 // The method data pointer needs to be updated. 1346 update_mdp_by_offset(mdp, 1347 in_bytes(MultiBranchData:: 1348 default_displacement_offset())); 1349 1350 bind(profile_continue); 1351 } 1352 } 1353 1354 void InterpreterMacroAssembler::profile_switch_case(Register index, 1355 Register mdp, 1356 Register reg2) { 1357 if (ProfileInterpreter) { 1358 Label profile_continue; 1359 1360 // If no method data exists, go to profile_continue. 1361 test_method_data_pointer(mdp, profile_continue); 1362 1363 // Build the base (index * per_case_size_in_bytes()) + 1364 // case_array_offset_in_bytes() 1365 movw(reg2, in_bytes(MultiBranchData::per_case_size())); 1366 movw(rscratch1, in_bytes(MultiBranchData::case_array_offset())); 1367 Assembler::maddw(index, index, reg2, rscratch1); 1368 1369 // Update the case count 1370 increment_mdp_data_at(mdp, 1371 index, 1372 in_bytes(MultiBranchData::relative_count_offset())); 1373 1374 // The method data pointer needs to be updated. 1375 update_mdp_by_offset(mdp, 1376 index, 1377 in_bytes(MultiBranchData:: 1378 relative_displacement_offset())); 1379 1380 bind(profile_continue); 1381 } 1382 } 1383 1384 void InterpreterMacroAssembler::verify_oop(Register reg, TosState state) { 1385 if (state == atos) { 1386 MacroAssembler::verify_oop(reg); 1387 } 1388 } 1389 1390 void InterpreterMacroAssembler::verify_FPU(int stack_depth, TosState state) { ; } 1391 1392 1393 void InterpreterMacroAssembler::notify_method_entry() { 1394 // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to 1395 // track stack depth. If it is possible to enter interp_only_mode we add 1396 // the code to check if the event should be sent. 1397 if (JvmtiExport::can_post_interpreter_events()) { 1398 Label L; 1399 ldrw(r3, Address(rthread, JavaThread::interp_only_mode_offset())); 1400 cbzw(r3, L); 1401 call_VM(noreg, CAST_FROM_FN_PTR(address, 1402 InterpreterRuntime::post_method_entry)); 1403 bind(L); 1404 } 1405 1406 { 1407 SkipIfEqual skip(this, &DTraceMethodProbes, false); 1408 get_method(c_rarg1); 1409 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), 1410 rthread, c_rarg1); 1411 } 1412 1413 // RedefineClasses() tracing support for obsolete method entry 1414 if (RC_TRACE_IN_RANGE(0x00001000, 0x00002000)) { 1415 get_method(c_rarg1); 1416 call_VM_leaf( 1417 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry), 1418 rthread, c_rarg1); 1419 } 1420 1421 } 1422 1423 1424 void InterpreterMacroAssembler::notify_method_exit( 1425 TosState state, NotifyMethodExitMode mode) { 1426 // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to 1427 // track stack depth. If it is possible to enter interp_only_mode we add 1428 // the code to check if the event should be sent. 1429 if (mode == NotifyJVMTI && JvmtiExport::can_post_interpreter_events()) { 1430 Label L; 1431 // Note: frame::interpreter_frame_result has a dependency on how the 1432 // method result is saved across the call to post_method_exit. If this 1433 // is changed then the interpreter_frame_result implementation will 1434 // need to be updated too. 1435 1436 // template interpreter will leave the result on the top of the stack. 1437 push(state); 1438 ldrw(r3, Address(rthread, JavaThread::interp_only_mode_offset())); 1439 cbz(r3, L); 1440 call_VM(noreg, 1441 CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit)); 1442 bind(L); 1443 pop(state); 1444 } 1445 1446 { 1447 SkipIfEqual skip(this, &DTraceMethodProbes, false); 1448 push(state); 1449 get_method(c_rarg1); 1450 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), 1451 rthread, c_rarg1); 1452 pop(state); 1453 } 1454 } 1455 1456 1457 // Jump if ((*counter_addr += increment) & mask) satisfies the condition. 1458 void InterpreterMacroAssembler::increment_mask_and_jump(Address counter_addr, 1459 int increment, Address mask, 1460 Register scratch, Register scratch2, 1461 bool preloaded, Condition cond, 1462 Label* where) { 1463 if (!preloaded) { 1464 ldrw(scratch, counter_addr); 1465 } 1466 add(scratch, scratch, increment); 1467 strw(scratch, counter_addr); 1468 ldrw(scratch2, mask); 1469 ands(scratch, scratch, scratch2); 1470 br(cond, *where); 1471 } 1472 1473 void InterpreterMacroAssembler::call_VM_leaf_base(address entry_point, 1474 int number_of_arguments) { 1475 // interpreter specific 1476 // 1477 // Note: No need to save/restore rbcp & rlocals pointer since these 1478 // are callee saved registers and no blocking/ GC can happen 1479 // in leaf calls. 1480 #ifdef ASSERT 1481 { 1482 Label L; 1483 ldr(rscratch1, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); 1484 cbz(rscratch1, L); 1485 stop("InterpreterMacroAssembler::call_VM_leaf_base:" 1486 " last_sp != NULL"); 1487 bind(L); 1488 } 1489 #endif /* ASSERT */ 1490 // super call 1491 MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments); 1492 } 1493 1494 void InterpreterMacroAssembler::call_VM_base(Register oop_result, 1495 Register java_thread, 1496 Register last_java_sp, 1497 address entry_point, 1498 int number_of_arguments, 1499 bool check_exceptions) { 1500 // interpreter specific 1501 // 1502 // Note: Could avoid restoring locals ptr (callee saved) - however doesn't 1503 // really make a difference for these runtime calls, since they are 1504 // slow anyway. Btw., bcp must be saved/restored since it may change 1505 // due to GC. 1506 // assert(java_thread == noreg , "not expecting a precomputed java thread"); 1507 save_bcp(); 1508 #ifdef ASSERT 1509 { 1510 Label L; 1511 ldr(rscratch1, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); 1512 cbz(rscratch1, L); 1513 stop("InterpreterMacroAssembler::call_VM_leaf_base:" 1514 " last_sp != NULL"); 1515 bind(L); 1516 } 1517 #endif /* ASSERT */ 1518 // super call 1519 MacroAssembler::call_VM_base(oop_result, noreg, last_java_sp, 1520 entry_point, number_of_arguments, 1521 check_exceptions); 1522 // interpreter specific 1523 restore_bcp(); 1524 restore_locals(); 1525 } 1526 1527 void InterpreterMacroAssembler::profile_obj_type(Register obj, const Address& mdo_addr) { 1528 Label update, next, none; 1529 1530 verify_oop(obj); 1531 1532 cbnz(obj, update); 1533 orptr(mdo_addr, TypeEntries::null_seen); 1534 b(next); 1535 1536 bind(update); 1537 load_klass(obj, obj); 1538 1539 ldr(rscratch1, mdo_addr); 1540 eor(obj, obj, rscratch1); 1541 tst(obj, TypeEntries::type_klass_mask); 1542 br(Assembler::EQ, next); // klass seen before, nothing to 1543 // do. The unknown bit may have been 1544 // set already but no need to check. 1545 1546 tst(obj, TypeEntries::type_unknown); 1547 br(Assembler::NE, next); // already unknown. Nothing to do anymore. 1548 1549 ldr(rscratch1, mdo_addr); 1550 cbz(rscratch1, none); 1551 cmp(rscratch1, TypeEntries::null_seen); 1552 br(Assembler::EQ, none); 1553 // There is a chance that the checks above (re-reading profiling 1554 // data from memory) fail if another thread has just set the 1555 // profiling to this obj's klass 1556 ldr(rscratch1, mdo_addr); 1557 eor(obj, obj, rscratch1); 1558 tst(obj, TypeEntries::type_klass_mask); 1559 br(Assembler::EQ, next); 1560 1561 // different than before. Cannot keep accurate profile. 1562 orptr(mdo_addr, TypeEntries::type_unknown); 1563 b(next); 1564 1565 bind(none); 1566 // first time here. Set profile type. 1567 str(obj, mdo_addr); 1568 1569 bind(next); 1570 } 1571 1572 void InterpreterMacroAssembler::profile_arguments_type(Register mdp, Register callee, Register tmp, bool is_virtual) { 1573 if (!ProfileInterpreter) { 1574 return; 1575 } 1576 1577 if (MethodData::profile_arguments() || MethodData::profile_return()) { 1578 Label profile_continue; 1579 1580 test_method_data_pointer(mdp, profile_continue); 1581 1582 int off_to_start = is_virtual ? in_bytes(VirtualCallData::virtual_call_data_size()) : in_bytes(CounterData::counter_data_size()); 1583 1584 ldrb(rscratch1, Address(mdp, in_bytes(DataLayout::tag_offset()) - off_to_start)); 1585 cmp(rscratch1, is_virtual ? DataLayout::virtual_call_type_data_tag : DataLayout::call_type_data_tag); 1586 br(Assembler::NE, profile_continue); 1587 1588 if (MethodData::profile_arguments()) { 1589 Label done; 1590 int off_to_args = in_bytes(TypeEntriesAtCall::args_data_offset()); 1591 1592 for (int i = 0; i < TypeProfileArgsLimit; i++) { 1593 if (i > 0 || MethodData::profile_return()) { 1594 // If return value type is profiled we may have no argument to profile 1595 ldr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset()))); 1596 sub(tmp, tmp, i*TypeStackSlotEntries::per_arg_count()); 1597 cmp(tmp, TypeStackSlotEntries::per_arg_count()); 1598 add(rscratch1, mdp, off_to_args); 1599 br(Assembler::LT, done); 1600 } 1601 ldr(tmp, Address(callee, Method::const_offset())); 1602 load_unsigned_short(tmp, Address(tmp, ConstMethod::size_of_parameters_offset())); 1603 // stack offset o (zero based) from the start of the argument 1604 // list, for n arguments translates into offset n - o - 1 from 1605 // the end of the argument list 1606 ldr(rscratch1, Address(mdp, in_bytes(TypeEntriesAtCall::stack_slot_offset(i)))); 1607 sub(tmp, tmp, rscratch1); 1608 sub(tmp, tmp, 1); 1609 Address arg_addr = argument_address(tmp); 1610 ldr(tmp, arg_addr); 1611 1612 Address mdo_arg_addr(mdp, in_bytes(TypeEntriesAtCall::argument_type_offset(i))); 1613 profile_obj_type(tmp, mdo_arg_addr); 1614 1615 int to_add = in_bytes(TypeStackSlotEntries::per_arg_size()); 1616 off_to_args += to_add; 1617 } 1618 1619 if (MethodData::profile_return()) { 1620 ldr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset()))); 1621 sub(tmp, tmp, TypeProfileArgsLimit*TypeStackSlotEntries::per_arg_count()); 1622 } 1623 1624 add(rscratch1, mdp, off_to_args); 1625 bind(done); 1626 mov(mdp, rscratch1); 1627 1628 if (MethodData::profile_return()) { 1629 // We're right after the type profile for the last 1630 // argument. tmp is the number of cells left in the 1631 // CallTypeData/VirtualCallTypeData to reach its end. Non null 1632 // if there's a return to profile. 1633 assert(ReturnTypeEntry::static_cell_count() < TypeStackSlotEntries::per_arg_count(), "can't move past ret type"); 1634 add(mdp, mdp, tmp, LSL, exact_log2(DataLayout::cell_size)); 1635 } 1636 str(mdp, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); 1637 } else { 1638 assert(MethodData::profile_return(), "either profile call args or call ret"); 1639 update_mdp_by_constant(mdp, in_bytes(TypeEntriesAtCall::return_only_size())); 1640 } 1641 1642 // mdp points right after the end of the 1643 // CallTypeData/VirtualCallTypeData, right after the cells for the 1644 // return value type if there's one 1645 1646 bind(profile_continue); 1647 } 1648 } 1649 1650 void InterpreterMacroAssembler::profile_return_type(Register mdp, Register ret, Register tmp) { 1651 assert_different_registers(mdp, ret, tmp, rbcp); 1652 if (ProfileInterpreter && MethodData::profile_return()) { 1653 Label profile_continue, done; 1654 1655 test_method_data_pointer(mdp, profile_continue); 1656 1657 if (MethodData::profile_return_jsr292_only()) { 1658 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2"); 1659 1660 // If we don't profile all invoke bytecodes we must make sure 1661 // it's a bytecode we indeed profile. We can't go back to the 1662 // begining of the ProfileData we intend to update to check its 1663 // type because we're right after it and we don't known its 1664 // length 1665 Label do_profile; 1666 ldrb(rscratch1, Address(rbcp, 0)); 1667 cmp(rscratch1, Bytecodes::_invokedynamic); 1668 br(Assembler::EQ, do_profile); 1669 cmp(rscratch1, Bytecodes::_invokehandle); 1670 br(Assembler::EQ, do_profile); 1671 get_method(tmp); 1672 ldrh(rscratch1, Address(tmp, Method::intrinsic_id_offset_in_bytes())); 1673 cmp(rscratch1, vmIntrinsics::_compiledLambdaForm); 1674 br(Assembler::NE, profile_continue); 1675 1676 bind(do_profile); 1677 } 1678 1679 Address mdo_ret_addr(mdp, -in_bytes(ReturnTypeEntry::size())); 1680 mov(tmp, ret); 1681 profile_obj_type(tmp, mdo_ret_addr); 1682 1683 bind(profile_continue); 1684 } 1685 } 1686 1687 void InterpreterMacroAssembler::profile_parameters_type(Register mdp, Register tmp1, Register tmp2) { 1688 if (ProfileInterpreter && MethodData::profile_parameters()) { 1689 Label profile_continue, done; 1690 1691 test_method_data_pointer(mdp, profile_continue); 1692 1693 // Load the offset of the area within the MDO used for 1694 // parameters. If it's negative we're not profiling any parameters 1695 ldr(tmp1, Address(mdp, in_bytes(MethodData::parameters_type_data_di_offset()) - in_bytes(MethodData::data_offset()))); 1696 cmp(tmp1, 0u); 1697 br(Assembler::LT, profile_continue); 1698 1699 // Compute a pointer to the area for parameters from the offset 1700 // and move the pointer to the slot for the last 1701 // parameters. Collect profiling from last parameter down. 1702 // mdo start + parameters offset + array length - 1 1703 add(mdp, mdp, tmp1); 1704 ldr(tmp1, Address(mdp, ArrayData::array_len_offset())); 1705 sub(tmp1, tmp1, TypeStackSlotEntries::per_arg_count()); 1706 1707 Label loop; 1708 bind(loop); 1709 1710 int off_base = in_bytes(ParametersTypeData::stack_slot_offset(0)); 1711 int type_base = in_bytes(ParametersTypeData::type_offset(0)); 1712 int per_arg_scale = exact_log2(DataLayout::cell_size); 1713 add(rscratch1, mdp, off_base); 1714 add(rscratch2, mdp, type_base); 1715 1716 Address arg_off(rscratch1, tmp1, Address::lsl(per_arg_scale)); 1717 Address arg_type(rscratch2, tmp1, Address::lsl(per_arg_scale)); 1718 1719 // load offset on the stack from the slot for this parameter 1720 ldr(tmp2, arg_off); 1721 neg(tmp2, tmp2); 1722 // read the parameter from the local area 1723 ldr(tmp2, Address(rlocals, tmp2, Address::lsl(Interpreter::logStackElementSize))); 1724 1725 // profile the parameter 1726 profile_obj_type(tmp2, arg_type); 1727 1728 // go to next parameter 1729 subs(tmp1, tmp1, TypeStackSlotEntries::per_arg_count()); 1730 br(Assembler::GE, loop); 1731 1732 bind(profile_continue); 1733 } 1734 }