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 "logging/log.hpp" 31 #include "oops/arrayOop.hpp" 32 #include "oops/markOop.hpp" 33 #include "oops/methodData.hpp" 34 #include "oops/method.hpp" 35 #include "prims/jvmtiExport.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 void InterpreterMacroAssembler::narrow(Register result) { 44 45 // Get method->_constMethod->_result_type 46 ldr(rscratch1, Address(rfp, frame::interpreter_frame_method_offset * wordSize)); 47 ldr(rscratch1, Address(rscratch1, Method::const_offset())); 48 ldrb(rscratch1, Address(rscratch1, ConstMethod::result_type_offset())); 49 50 Label done, notBool, notByte, notChar; 51 52 // common case first 53 cmpw(rscratch1, T_INT); 54 br(Assembler::EQ, done); 55 56 // mask integer result to narrower return type. 57 cmpw(rscratch1, T_BOOLEAN); 58 br(Assembler::NE, notBool); 59 andw(result, result, 0x1); 60 b(done); 61 62 bind(notBool); 63 cmpw(rscratch1, T_BYTE); 64 br(Assembler::NE, notByte); 65 sbfx(result, result, 0, 8); 66 b(done); 67 68 bind(notByte); 69 cmpw(rscratch1, T_CHAR); 70 br(Assembler::NE, notChar); 71 ubfx(result, result, 0, 16); // truncate upper 16 bits 72 b(done); 73 74 bind(notChar); 75 sbfx(result, result, 0, 16); // sign-extend short 76 77 // Nothing to do for T_INT 78 bind(done); 79 } 80 81 void InterpreterMacroAssembler::jump_to_entry(address entry) { 82 assert(entry, "Entry must have been generated by now"); 83 b(entry); 84 } 85 86 void InterpreterMacroAssembler::check_and_handle_popframe(Register java_thread) { 87 if (JvmtiExport::can_pop_frame()) { 88 Label L; 89 // Initiate popframe handling only if it is not already being 90 // processed. If the flag has the popframe_processing bit set, it 91 // means that this code is called *during* popframe handling - we 92 // don't want to reenter. 93 // This method is only called just after the call into the vm in 94 // call_VM_base, so the arg registers are available. 95 ldrw(rscratch1, Address(rthread, JavaThread::popframe_condition_offset())); 96 tbz(rscratch1, exact_log2(JavaThread::popframe_pending_bit), L); 97 tbnz(rscratch1, exact_log2(JavaThread::popframe_processing_bit), L); 98 // Call Interpreter::remove_activation_preserving_args_entry() to get the 99 // address of the same-named entrypoint in the generated interpreter code. 100 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_preserving_args_entry)); 101 br(r0); 102 bind(L); 103 } 104 } 105 106 107 void InterpreterMacroAssembler::load_earlyret_value(TosState state) { 108 ldr(r2, Address(rthread, JavaThread::jvmti_thread_state_offset())); 109 const Address tos_addr(r2, JvmtiThreadState::earlyret_tos_offset()); 110 const Address oop_addr(r2, JvmtiThreadState::earlyret_oop_offset()); 111 const Address val_addr(r2, JvmtiThreadState::earlyret_value_offset()); 112 switch (state) { 113 case atos: ldr(r0, oop_addr); 114 str(zr, oop_addr); 115 verify_oop(r0, state); break; 116 case ltos: ldr(r0, val_addr); break; 117 case btos: // fall through 118 case ztos: // fall through 119 case ctos: // fall through 120 case stos: // fall through 121 case itos: ldrw(r0, val_addr); break; 122 case ftos: ldrs(v0, val_addr); break; 123 case dtos: ldrd(v0, val_addr); break; 124 case vtos: /* nothing to do */ break; 125 default : ShouldNotReachHere(); 126 } 127 // Clean up tos value in the thread object 128 movw(rscratch1, (int) ilgl); 129 strw(rscratch1, tos_addr); 130 strw(zr, val_addr); 131 } 132 133 134 void InterpreterMacroAssembler::check_and_handle_earlyret(Register java_thread) { 135 if (JvmtiExport::can_force_early_return()) { 136 Label L; 137 ldr(rscratch1, Address(rthread, JavaThread::jvmti_thread_state_offset())); 138 cbz(rscratch1, L); // if (thread->jvmti_thread_state() == NULL) exit; 139 140 // Initiate earlyret handling only if it is not already being processed. 141 // If the flag has the earlyret_processing bit set, it means that this code 142 // is called *during* earlyret handling - we don't want to reenter. 143 ldrw(rscratch1, Address(rscratch1, JvmtiThreadState::earlyret_state_offset())); 144 cmpw(rscratch1, JvmtiThreadState::earlyret_pending); 145 br(Assembler::NE, L); 146 147 // Call Interpreter::remove_activation_early_entry() to get the address of the 148 // same-named entrypoint in the generated interpreter code. 149 ldr(rscratch1, Address(rthread, JavaThread::jvmti_thread_state_offset())); 150 ldrw(rscratch1, Address(rscratch1, JvmtiThreadState::earlyret_tos_offset())); 151 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_early_entry), rscratch1); 152 br(r0); 153 bind(L); 154 } 155 } 156 157 void InterpreterMacroAssembler::get_unsigned_2_byte_index_at_bcp( 158 Register reg, 159 int bcp_offset) { 160 assert(bcp_offset >= 0, "bcp is still pointing to start of bytecode"); 161 ldrh(reg, Address(rbcp, bcp_offset)); 162 rev16(reg, reg); 163 } 164 165 void InterpreterMacroAssembler::get_dispatch() { 166 unsigned long offset; 167 adrp(rdispatch, ExternalAddress((address)Interpreter::dispatch_table()), offset); 168 lea(rdispatch, Address(rdispatch, offset)); 169 } 170 171 void InterpreterMacroAssembler::get_cache_index_at_bcp(Register index, 172 int bcp_offset, 173 size_t index_size) { 174 assert(bcp_offset > 0, "bcp is still pointing to start of bytecode"); 175 if (index_size == sizeof(u2)) { 176 load_unsigned_short(index, Address(rbcp, bcp_offset)); 177 } else if (index_size == sizeof(u4)) { 178 // assert(EnableInvokeDynamic, "giant index used only for JSR 292"); 179 ldrw(index, Address(rbcp, bcp_offset)); 180 // Check if the secondary index definition is still ~x, otherwise 181 // we have to change the following assembler code to calculate the 182 // plain index. 183 assert(ConstantPool::decode_invokedynamic_index(~123) == 123, "else change next line"); 184 eonw(index, index, zr); // convert to plain index 185 } else if (index_size == sizeof(u1)) { 186 load_unsigned_byte(index, Address(rbcp, bcp_offset)); 187 } else { 188 ShouldNotReachHere(); 189 } 190 } 191 192 // Return 193 // Rindex: index into constant pool 194 // Rcache: address of cache entry - ConstantPoolCache::base_offset() 195 // 196 // A caller must add ConstantPoolCache::base_offset() to Rcache to get 197 // the true address of the cache entry. 198 // 199 void InterpreterMacroAssembler::get_cache_and_index_at_bcp(Register cache, 200 Register index, 201 int bcp_offset, 202 size_t index_size) { 203 assert_different_registers(cache, index); 204 assert_different_registers(cache, rcpool); 205 get_cache_index_at_bcp(index, bcp_offset, index_size); 206 assert(sizeof(ConstantPoolCacheEntry) == 4 * wordSize, "adjust code below"); 207 // convert from field index to ConstantPoolCacheEntry 208 // aarch64 already has the cache in rcpool so there is no need to 209 // install it in cache. instead we pre-add the indexed offset to 210 // rcpool and return it in cache. All clients of this method need to 211 // be modified accordingly. 212 add(cache, rcpool, index, Assembler::LSL, 5); 213 } 214 215 216 void InterpreterMacroAssembler::get_cache_and_index_and_bytecode_at_bcp(Register cache, 217 Register index, 218 Register bytecode, 219 int byte_no, 220 int bcp_offset, 221 size_t index_size) { 222 get_cache_and_index_at_bcp(cache, index, bcp_offset, index_size); 223 // We use a 32-bit load here since the layout of 64-bit words on 224 // little-endian machines allow us that. 225 // n.b. unlike x86 cache already includes the index offset 226 lea(bytecode, Address(cache, 227 ConstantPoolCache::base_offset() 228 + ConstantPoolCacheEntry::indices_offset())); 229 ldarw(bytecode, bytecode); 230 const int shift_count = (1 + byte_no) * BitsPerByte; 231 ubfx(bytecode, bytecode, shift_count, BitsPerByte); 232 } 233 234 void InterpreterMacroAssembler::get_cache_entry_pointer_at_bcp(Register cache, 235 Register tmp, 236 int bcp_offset, 237 size_t index_size) { 238 assert(cache != tmp, "must use different register"); 239 get_cache_index_at_bcp(tmp, bcp_offset, index_size); 240 assert(sizeof(ConstantPoolCacheEntry) == 4 * wordSize, "adjust code below"); 241 // convert from field index to ConstantPoolCacheEntry index 242 // and from word offset to byte offset 243 assert(exact_log2(in_bytes(ConstantPoolCacheEntry::size_in_bytes())) == 2 + LogBytesPerWord, "else change next line"); 244 ldr(cache, Address(rfp, frame::interpreter_frame_cache_offset * wordSize)); 245 // skip past the header 246 add(cache, cache, in_bytes(ConstantPoolCache::base_offset())); 247 add(cache, cache, tmp, Assembler::LSL, 2 + LogBytesPerWord); // construct pointer to cache entry 248 } 249 250 void InterpreterMacroAssembler::get_method_counters(Register method, 251 Register mcs, Label& skip) { 252 Label has_counters; 253 ldr(mcs, Address(method, Method::method_counters_offset())); 254 cbnz(mcs, has_counters); 255 call_VM(noreg, CAST_FROM_FN_PTR(address, 256 InterpreterRuntime::build_method_counters), method); 257 ldr(mcs, Address(method, Method::method_counters_offset())); 258 cbz(mcs, skip); // No MethodCounters allocated, OutOfMemory 259 bind(has_counters); 260 } 261 262 // Load object from cpool->resolved_references(index) 263 void InterpreterMacroAssembler::load_resolved_reference_at_index( 264 Register result, Register index) { 265 assert_different_registers(result, index); 266 // convert from field index to resolved_references() index and from 267 // word index to byte offset. Since this is a java object, it can be compressed 268 Register tmp = index; // reuse 269 lslw(tmp, tmp, LogBytesPerHeapOop); 270 271 get_constant_pool(result); 272 // load pointer for resolved_references[] objArray 273 ldr(result, Address(result, ConstantPool::resolved_references_offset_in_bytes())); 274 // JNIHandles::resolve(obj); 275 ldr(result, Address(result, 0)); 276 // Add in the index 277 add(result, result, tmp); 278 load_heap_oop(result, Address(result, arrayOopDesc::base_offset_in_bytes(T_OBJECT))); 279 } 280 281 // Generate a subtype check: branch to ok_is_subtype if sub_klass is a 282 // subtype of super_klass. 283 // 284 // Args: 285 // r0: superklass 286 // Rsub_klass: subklass 287 // 288 // Kills: 289 // r2, r5 290 void InterpreterMacroAssembler::gen_subtype_check(Register Rsub_klass, 291 Label& ok_is_subtype) { 292 assert(Rsub_klass != r0, "r0 holds superklass"); 293 assert(Rsub_klass != r2, "r2 holds 2ndary super array length"); 294 assert(Rsub_klass != r5, "r5 holds 2ndary super array scan ptr"); 295 296 // Profile the not-null value's klass. 297 profile_typecheck(r2, Rsub_klass, r5); // blows r2, reloads r5 298 299 // Do the check. 300 check_klass_subtype(Rsub_klass, r0, r2, ok_is_subtype); // blows r2 301 302 // Profile the failure of the check. 303 profile_typecheck_failed(r2); // blows r2 304 } 305 306 // Java Expression Stack 307 308 void InterpreterMacroAssembler::pop_ptr(Register r) { 309 ldr(r, post(esp, wordSize)); 310 } 311 312 void InterpreterMacroAssembler::pop_i(Register r) { 313 ldrw(r, post(esp, wordSize)); 314 } 315 316 void InterpreterMacroAssembler::pop_l(Register r) { 317 ldr(r, post(esp, 2 * Interpreter::stackElementSize)); 318 } 319 320 void InterpreterMacroAssembler::push_ptr(Register r) { 321 str(r, pre(esp, -wordSize)); 322 } 323 324 void InterpreterMacroAssembler::push_i(Register r) { 325 str(r, pre(esp, -wordSize)); 326 } 327 328 void InterpreterMacroAssembler::push_l(Register r) { 329 str(zr, pre(esp, -wordSize)); 330 str(r, pre(esp, -wordsize)); 331 } 332 333 void InterpreterMacroAssembler::pop_f(FloatRegister r) { 334 ldrs(r, post(esp, wordSize)); 335 } 336 337 void InterpreterMacroAssembler::pop_d(FloatRegister r) { 338 ldrd(r, post(esp, 2 * Interpreter::stackElementSize)); 339 } 340 341 void InterpreterMacroAssembler::push_f(FloatRegister r) { 342 strs(r, pre(esp, -wordSize)); 343 } 344 345 void InterpreterMacroAssembler::push_d(FloatRegister r) { 346 strd(r, pre(esp, 2* -wordSize)); 347 } 348 349 void InterpreterMacroAssembler::pop(TosState state) { 350 switch (state) { 351 case atos: pop_ptr(); break; 352 case btos: 353 case ztos: 354 case ctos: 355 case stos: 356 case itos: pop_i(); break; 357 case ltos: pop_l(); break; 358 case ftos: pop_f(); break; 359 case dtos: pop_d(); break; 360 case vtos: /* nothing to do */ break; 361 default: ShouldNotReachHere(); 362 } 363 verify_oop(r0, state); 364 } 365 366 void InterpreterMacroAssembler::push(TosState state) { 367 verify_oop(r0, state); 368 switch (state) { 369 case atos: push_ptr(); break; 370 case btos: 371 case ztos: 372 case ctos: 373 case stos: 374 case itos: push_i(); break; 375 case ltos: push_l(); break; 376 case ftos: push_f(); break; 377 case dtos: push_d(); break; 378 case vtos: /* nothing to do */ break; 379 default : ShouldNotReachHere(); 380 } 381 } 382 383 // Helpers for swap and dup 384 void InterpreterMacroAssembler::load_ptr(int n, Register val) { 385 ldr(val, Address(esp, Interpreter::expr_offset_in_bytes(n))); 386 } 387 388 void InterpreterMacroAssembler::store_ptr(int n, Register val) { 389 str(val, Address(esp, Interpreter::expr_offset_in_bytes(n))); 390 } 391 392 393 void InterpreterMacroAssembler::prepare_to_jump_from_interpreted() { 394 // set sender sp 395 mov(r13, sp); 396 // record last_sp 397 str(esp, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); 398 } 399 400 // Jump to from_interpreted entry of a call unless single stepping is possible 401 // in this thread in which case we must call the i2i entry 402 void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) { 403 prepare_to_jump_from_interpreted(); 404 405 if (JvmtiExport::can_post_interpreter_events()) { 406 Label run_compiled_code; 407 // JVMTI events, such as single-stepping, are implemented partly by avoiding running 408 // compiled code in threads for which the event is enabled. Check here for 409 // interp_only_mode if these events CAN be enabled. 410 // interp_only is an int, on little endian it is sufficient to test the byte only 411 // Is a cmpl faster? 412 ldr(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset())); 413 cbz(rscratch1, run_compiled_code); 414 ldr(rscratch1, Address(method, Method::interpreter_entry_offset())); 415 br(rscratch1); 416 bind(run_compiled_code); 417 } 418 419 ldr(rscratch1, Address(method, Method::from_interpreted_offset())); 420 br(rscratch1); 421 } 422 423 // The following two routines provide a hook so that an implementation 424 // can schedule the dispatch in two parts. amd64 does not do this. 425 void InterpreterMacroAssembler::dispatch_prolog(TosState state, int step) { 426 } 427 428 void InterpreterMacroAssembler::dispatch_epilog(TosState state, int step) { 429 dispatch_next(state, step); 430 } 431 432 void InterpreterMacroAssembler::dispatch_base(TosState state, 433 address* table, 434 bool verifyoop) { 435 if (VerifyActivationFrameSize) { 436 Unimplemented(); 437 } 438 if (verifyoop) { 439 verify_oop(r0, state); 440 } 441 if (table == Interpreter::dispatch_table(state)) { 442 addw(rscratch2, rscratch1, Interpreter::distance_from_dispatch_table(state)); 443 ldr(rscratch2, Address(rdispatch, rscratch2, Address::uxtw(3))); 444 } else { 445 mov(rscratch2, (address)table); 446 ldr(rscratch2, Address(rscratch2, rscratch1, Address::uxtw(3))); 447 } 448 br(rscratch2); 449 } 450 451 void InterpreterMacroAssembler::dispatch_only(TosState state) { 452 dispatch_base(state, Interpreter::dispatch_table(state)); 453 } 454 455 void InterpreterMacroAssembler::dispatch_only_normal(TosState state) { 456 dispatch_base(state, Interpreter::normal_table(state)); 457 } 458 459 void InterpreterMacroAssembler::dispatch_only_noverify(TosState state) { 460 dispatch_base(state, Interpreter::normal_table(state), false); 461 } 462 463 464 void InterpreterMacroAssembler::dispatch_next(TosState state, int step) { 465 // load next bytecode 466 ldrb(rscratch1, Address(pre(rbcp, step))); 467 dispatch_base(state, Interpreter::dispatch_table(state)); 468 } 469 470 void InterpreterMacroAssembler::dispatch_via(TosState state, address* table) { 471 // load current bytecode 472 ldrb(rscratch1, Address(rbcp, 0)); 473 dispatch_base(state, table); 474 } 475 476 // remove activation 477 // 478 // Unlock the receiver if this is a synchronized method. 479 // Unlock any Java monitors from syncronized blocks. 480 // Remove the activation from the stack. 481 // 482 // If there are locked Java monitors 483 // If throw_monitor_exception 484 // throws IllegalMonitorStateException 485 // Else if install_monitor_exception 486 // installs IllegalMonitorStateException 487 // Else 488 // no error processing 489 void InterpreterMacroAssembler::remove_activation( 490 TosState state, 491 bool throw_monitor_exception, 492 bool install_monitor_exception, 493 bool notify_jvmdi) { 494 // Note: Registers r3 xmm0 may be in use for the 495 // result check if synchronized method 496 Label unlocked, unlock, no_unlock; 497 498 // get the value of _do_not_unlock_if_synchronized into r3 499 const Address do_not_unlock_if_synchronized(rthread, 500 in_bytes(JavaThread::do_not_unlock_if_synchronized_offset())); 501 ldrb(r3, do_not_unlock_if_synchronized); 502 strb(zr, do_not_unlock_if_synchronized); // reset the flag 503 504 // get method access flags 505 ldr(r1, Address(rfp, frame::interpreter_frame_method_offset * wordSize)); 506 ldr(r2, Address(r1, Method::access_flags_offset())); 507 tbz(r2, exact_log2(JVM_ACC_SYNCHRONIZED), unlocked); 508 509 // Don't unlock anything if the _do_not_unlock_if_synchronized flag 510 // is set. 511 cbnz(r3, no_unlock); 512 513 // unlock monitor 514 push(state); // save result 515 516 // BasicObjectLock will be first in list, since this is a 517 // synchronized method. However, need to check that the object has 518 // not been unlocked by an explicit monitorexit bytecode. 519 const Address monitor(rfp, frame::interpreter_frame_initial_sp_offset * 520 wordSize - (int) sizeof(BasicObjectLock)); 521 // We use c_rarg1 so that if we go slow path it will be the correct 522 // register for unlock_object to pass to VM directly 523 lea(c_rarg1, monitor); // address of first monitor 524 525 ldr(r0, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes())); 526 cbnz(r0, unlock); 527 528 pop(state); 529 if (throw_monitor_exception) { 530 // Entry already unlocked, need to throw exception 531 call_VM(noreg, CAST_FROM_FN_PTR(address, 532 InterpreterRuntime::throw_illegal_monitor_state_exception)); 533 should_not_reach_here(); 534 } else { 535 // Monitor already unlocked during a stack unroll. If requested, 536 // install an illegal_monitor_state_exception. Continue with 537 // stack unrolling. 538 if (install_monitor_exception) { 539 call_VM(noreg, CAST_FROM_FN_PTR(address, 540 InterpreterRuntime::new_illegal_monitor_state_exception)); 541 } 542 b(unlocked); 543 } 544 545 bind(unlock); 546 unlock_object(c_rarg1); 547 pop(state); 548 549 // Check that for block-structured locking (i.e., that all locked 550 // objects has been unlocked) 551 bind(unlocked); 552 553 // r0: Might contain return value 554 555 // Check that all monitors are unlocked 556 { 557 Label loop, exception, entry, restart; 558 const int entry_size = frame::interpreter_frame_monitor_size() * wordSize; 559 const Address monitor_block_top( 560 rfp, frame::interpreter_frame_monitor_block_top_offset * wordSize); 561 const Address monitor_block_bot( 562 rfp, frame::interpreter_frame_initial_sp_offset * wordSize); 563 564 bind(restart); 565 // We use c_rarg1 so that if we go slow path it will be the correct 566 // register for unlock_object to pass to VM directly 567 ldr(c_rarg1, monitor_block_top); // points to current entry, starting 568 // with top-most entry 569 lea(r19, monitor_block_bot); // points to word before bottom of 570 // monitor block 571 b(entry); 572 573 // Entry already locked, need to throw exception 574 bind(exception); 575 576 if (throw_monitor_exception) { 577 // Throw exception 578 MacroAssembler::call_VM(noreg, 579 CAST_FROM_FN_PTR(address, InterpreterRuntime:: 580 throw_illegal_monitor_state_exception)); 581 should_not_reach_here(); 582 } else { 583 // Stack unrolling. Unlock object and install illegal_monitor_exception. 584 // Unlock does not block, so don't have to worry about the frame. 585 // We don't have to preserve c_rarg1 since we are going to throw an exception. 586 587 push(state); 588 unlock_object(c_rarg1); 589 pop(state); 590 591 if (install_monitor_exception) { 592 call_VM(noreg, CAST_FROM_FN_PTR(address, 593 InterpreterRuntime:: 594 new_illegal_monitor_state_exception)); 595 } 596 597 b(restart); 598 } 599 600 bind(loop); 601 // check if current entry is used 602 ldr(rscratch1, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes())); 603 cbnz(rscratch1, exception); 604 605 add(c_rarg1, c_rarg1, entry_size); // otherwise advance to next entry 606 bind(entry); 607 cmp(c_rarg1, r19); // check if bottom reached 608 br(Assembler::NE, loop); // if not at bottom then check this entry 609 } 610 611 bind(no_unlock); 612 613 // jvmti support 614 if (notify_jvmdi) { 615 notify_method_exit(state, NotifyJVMTI); // preserve TOSCA 616 } else { 617 notify_method_exit(state, SkipNotifyJVMTI); // preserve TOSCA 618 } 619 620 // remove activation 621 // get sender esp 622 ldr(esp, 623 Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); 624 // remove frame anchor 625 leave(); 626 // If we're returning to interpreted code we will shortly be 627 // adjusting SP to allow some space for ESP. If we're returning to 628 // compiled code the saved sender SP was saved in sender_sp, so this 629 // restores it. 630 andr(sp, esp, -16); 631 } 632 633 // Lock object 634 // 635 // Args: 636 // c_rarg1: BasicObjectLock to be used for locking 637 // 638 // Kills: 639 // r0 640 // c_rarg0, c_rarg1, c_rarg2, c_rarg3, .. (param regs) 641 // rscratch1, rscratch2 (scratch regs) 642 void InterpreterMacroAssembler::lock_object(Register lock_reg) 643 { 644 assert(lock_reg == c_rarg1, "The argument is only for looks. It must be c_rarg1"); 645 if (UseHeavyMonitors) { 646 call_VM(noreg, 647 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), 648 lock_reg); 649 } else { 650 Label done; 651 652 const Register swap_reg = r0; 653 const Register tmp = c_rarg2; 654 const Register obj_reg = c_rarg3; // Will contain the oop 655 656 const int obj_offset = BasicObjectLock::obj_offset_in_bytes(); 657 const int lock_offset = BasicObjectLock::lock_offset_in_bytes (); 658 const int mark_offset = lock_offset + 659 BasicLock::displaced_header_offset_in_bytes(); 660 661 Label slow_case; 662 663 // Load object pointer into obj_reg %c_rarg3 664 ldr(obj_reg, Address(lock_reg, obj_offset)); 665 666 if (UseBiasedLocking) { 667 biased_locking_enter(lock_reg, obj_reg, swap_reg, tmp, false, done, &slow_case); 668 } 669 670 // Load (object->mark() | 1) into swap_reg 671 ldr(rscratch1, Address(obj_reg, 0)); 672 orr(swap_reg, rscratch1, 1); 673 674 // Save (object->mark() | 1) into BasicLock's displaced header 675 str(swap_reg, Address(lock_reg, mark_offset)); 676 677 assert(lock_offset == 0, 678 "displached header must be first word in BasicObjectLock"); 679 680 Label fail; 681 if (PrintBiasedLockingStatistics) { 682 Label fast; 683 cmpxchgptr(swap_reg, lock_reg, obj_reg, rscratch1, fast, &fail); 684 bind(fast); 685 atomic_incw(Address((address)BiasedLocking::fast_path_entry_count_addr()), 686 rscratch2, rscratch1, tmp); 687 b(done); 688 bind(fail); 689 } else { 690 cmpxchgptr(swap_reg, lock_reg, obj_reg, rscratch1, done, /*fallthrough*/NULL); 691 } 692 693 // Test if the oopMark is an obvious stack pointer, i.e., 694 // 1) (mark & 7) == 0, and 695 // 2) rsp <= mark < mark + os::pagesize() 696 // 697 // These 3 tests can be done by evaluating the following 698 // expression: ((mark - rsp) & (7 - os::vm_page_size())), 699 // assuming both stack pointer and pagesize have their 700 // least significant 3 bits clear. 701 // NOTE: the oopMark is in swap_reg %r0 as the result of cmpxchg 702 // NOTE2: aarch64 does not like to subtract sp from rn so take a 703 // copy 704 mov(rscratch1, sp); 705 sub(swap_reg, swap_reg, rscratch1); 706 ands(swap_reg, swap_reg, (unsigned long)(7 - os::vm_page_size())); 707 708 // Save the test result, for recursive case, the result is zero 709 str(swap_reg, Address(lock_reg, mark_offset)); 710 711 if (PrintBiasedLockingStatistics) { 712 br(Assembler::NE, slow_case); 713 atomic_incw(Address((address)BiasedLocking::fast_path_entry_count_addr()), 714 rscratch2, rscratch1, tmp); 715 } 716 br(Assembler::EQ, done); 717 718 bind(slow_case); 719 720 // Call the runtime routine for slow case 721 call_VM(noreg, 722 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), 723 lock_reg); 724 725 bind(done); 726 } 727 } 728 729 730 // Unlocks an object. Used in monitorexit bytecode and 731 // remove_activation. Throws an IllegalMonitorException if object is 732 // not locked by current thread. 733 // 734 // Args: 735 // c_rarg1: BasicObjectLock for lock 736 // 737 // Kills: 738 // r0 739 // c_rarg0, c_rarg1, c_rarg2, c_rarg3, ... (param regs) 740 // rscratch1, rscratch2 (scratch regs) 741 void InterpreterMacroAssembler::unlock_object(Register lock_reg) 742 { 743 assert(lock_reg == c_rarg1, "The argument is only for looks. It must be rarg1"); 744 745 if (UseHeavyMonitors) { 746 call_VM(noreg, 747 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), 748 lock_reg); 749 } else { 750 Label done; 751 752 const Register swap_reg = r0; 753 const Register header_reg = c_rarg2; // Will contain the old oopMark 754 const Register obj_reg = c_rarg3; // Will contain the oop 755 756 save_bcp(); // Save in case of exception 757 758 // Convert from BasicObjectLock structure to object and BasicLock 759 // structure Store the BasicLock address into %r0 760 lea(swap_reg, Address(lock_reg, BasicObjectLock::lock_offset_in_bytes())); 761 762 // Load oop into obj_reg(%c_rarg3) 763 ldr(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes())); 764 765 // Free entry 766 str(zr, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes())); 767 768 if (UseBiasedLocking) { 769 biased_locking_exit(obj_reg, header_reg, done); 770 } 771 772 // Load the old header from BasicLock structure 773 ldr(header_reg, Address(swap_reg, 774 BasicLock::displaced_header_offset_in_bytes())); 775 776 // Test for recursion 777 cbz(header_reg, done); 778 779 // Atomic swap back the old header 780 cmpxchgptr(swap_reg, header_reg, obj_reg, rscratch1, done, /*fallthrough*/NULL); 781 782 // Call the runtime routine for slow case. 783 str(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes())); // restore obj 784 call_VM(noreg, 785 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), 786 lock_reg); 787 788 bind(done); 789 790 restore_bcp(); 791 } 792 } 793 794 void InterpreterMacroAssembler::test_method_data_pointer(Register mdp, 795 Label& zero_continue) { 796 assert(ProfileInterpreter, "must be profiling interpreter"); 797 ldr(mdp, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); 798 cbz(mdp, zero_continue); 799 } 800 801 // Set the method data pointer for the current bcp. 802 void InterpreterMacroAssembler::set_method_data_pointer_for_bcp() { 803 assert(ProfileInterpreter, "must be profiling interpreter"); 804 Label set_mdp; 805 stp(r0, r1, Address(pre(sp, -2 * wordSize))); 806 807 // Test MDO to avoid the call if it is NULL. 808 ldr(r0, Address(rmethod, in_bytes(Method::method_data_offset()))); 809 cbz(r0, set_mdp); 810 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), rmethod, rbcp); 811 // r0: mdi 812 // mdo is guaranteed to be non-zero here, we checked for it before the call. 813 ldr(r1, Address(rmethod, in_bytes(Method::method_data_offset()))); 814 lea(r1, Address(r1, in_bytes(MethodData::data_offset()))); 815 add(r0, r1, r0); 816 str(r0, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); 817 bind(set_mdp); 818 ldp(r0, r1, Address(post(sp, 2 * wordSize))); 819 } 820 821 void InterpreterMacroAssembler::verify_method_data_pointer() { 822 assert(ProfileInterpreter, "must be profiling interpreter"); 823 #ifdef ASSERT 824 Label verify_continue; 825 stp(r0, r1, Address(pre(sp, -2 * wordSize))); 826 stp(r2, r3, Address(pre(sp, -2 * wordSize))); 827 test_method_data_pointer(r3, verify_continue); // If mdp is zero, continue 828 get_method(r1); 829 830 // If the mdp is valid, it will point to a DataLayout header which is 831 // consistent with the bcp. The converse is highly probable also. 832 ldrsh(r2, Address(r3, in_bytes(DataLayout::bci_offset()))); 833 ldr(rscratch1, Address(r1, Method::const_offset())); 834 add(r2, r2, rscratch1, Assembler::LSL); 835 lea(r2, Address(r2, ConstMethod::codes_offset())); 836 cmp(r2, rbcp); 837 br(Assembler::EQ, verify_continue); 838 // r1: method 839 // rbcp: bcp // rbcp == 22 840 // r3: mdp 841 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp), 842 r1, rbcp, r3); 843 bind(verify_continue); 844 ldp(r2, r3, Address(post(sp, 2 * wordSize))); 845 ldp(r0, r1, Address(post(sp, 2 * wordSize))); 846 #endif // ASSERT 847 } 848 849 850 void InterpreterMacroAssembler::set_mdp_data_at(Register mdp_in, 851 int constant, 852 Register value) { 853 assert(ProfileInterpreter, "must be profiling interpreter"); 854 Address data(mdp_in, constant); 855 str(value, data); 856 } 857 858 859 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in, 860 int constant, 861 bool decrement) { 862 increment_mdp_data_at(mdp_in, noreg, constant, decrement); 863 } 864 865 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in, 866 Register reg, 867 int constant, 868 bool decrement) { 869 assert(ProfileInterpreter, "must be profiling interpreter"); 870 // %%% this does 64bit counters at best it is wasting space 871 // at worst it is a rare bug when counters overflow 872 873 assert_different_registers(rscratch2, rscratch1, mdp_in, reg); 874 875 Address addr1(mdp_in, constant); 876 Address addr2(rscratch2, reg, Address::lsl(0)); 877 Address &addr = addr1; 878 if (reg != noreg) { 879 lea(rscratch2, addr1); 880 addr = addr2; 881 } 882 883 if (decrement) { 884 // Decrement the register. Set condition codes. 885 // Intel does this 886 // addptr(data, (int32_t) -DataLayout::counter_increment); 887 // If the decrement causes the counter to overflow, stay negative 888 // Label L; 889 // jcc(Assembler::negative, L); 890 // addptr(data, (int32_t) DataLayout::counter_increment); 891 // so we do this 892 ldr(rscratch1, addr); 893 subs(rscratch1, rscratch1, (unsigned)DataLayout::counter_increment); 894 Label L; 895 br(Assembler::LO, L); // skip store if counter underflow 896 str(rscratch1, addr); 897 bind(L); 898 } else { 899 assert(DataLayout::counter_increment == 1, 900 "flow-free idiom only works with 1"); 901 // Intel does this 902 // Increment the register. Set carry flag. 903 // addptr(data, DataLayout::counter_increment); 904 // If the increment causes the counter to overflow, pull back by 1. 905 // sbbptr(data, (int32_t)0); 906 // so we do this 907 ldr(rscratch1, addr); 908 adds(rscratch1, rscratch1, DataLayout::counter_increment); 909 Label L; 910 br(Assembler::CS, L); // skip store if counter overflow 911 str(rscratch1, addr); 912 bind(L); 913 } 914 } 915 916 void InterpreterMacroAssembler::set_mdp_flag_at(Register mdp_in, 917 int flag_byte_constant) { 918 assert(ProfileInterpreter, "must be profiling interpreter"); 919 int header_offset = in_bytes(DataLayout::header_offset()); 920 int header_bits = DataLayout::flag_mask_to_header_mask(flag_byte_constant); 921 // Set the flag 922 ldr(rscratch1, Address(mdp_in, header_offset)); 923 orr(rscratch1, rscratch1, header_bits); 924 str(rscratch1, Address(mdp_in, header_offset)); 925 } 926 927 928 void InterpreterMacroAssembler::test_mdp_data_at(Register mdp_in, 929 int offset, 930 Register value, 931 Register test_value_out, 932 Label& not_equal_continue) { 933 assert(ProfileInterpreter, "must be profiling interpreter"); 934 if (test_value_out == noreg) { 935 ldr(rscratch1, Address(mdp_in, offset)); 936 cmp(value, rscratch1); 937 } else { 938 // Put the test value into a register, so caller can use it: 939 ldr(test_value_out, Address(mdp_in, offset)); 940 cmp(value, test_value_out); 941 } 942 br(Assembler::NE, not_equal_continue); 943 } 944 945 946 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in, 947 int offset_of_disp) { 948 assert(ProfileInterpreter, "must be profiling interpreter"); 949 ldr(rscratch1, Address(mdp_in, offset_of_disp)); 950 add(mdp_in, mdp_in, rscratch1, LSL); 951 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); 952 } 953 954 955 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in, 956 Register reg, 957 int offset_of_disp) { 958 assert(ProfileInterpreter, "must be profiling interpreter"); 959 lea(rscratch1, Address(mdp_in, offset_of_disp)); 960 ldr(rscratch1, Address(rscratch1, reg, Address::lsl(0))); 961 add(mdp_in, mdp_in, rscratch1, LSL); 962 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); 963 } 964 965 966 void InterpreterMacroAssembler::update_mdp_by_constant(Register mdp_in, 967 int constant) { 968 assert(ProfileInterpreter, "must be profiling interpreter"); 969 add(mdp_in, mdp_in, (unsigned)constant); 970 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); 971 } 972 973 974 void InterpreterMacroAssembler::update_mdp_for_ret(Register return_bci) { 975 assert(ProfileInterpreter, "must be profiling interpreter"); 976 // save/restore across call_VM 977 stp(zr, return_bci, Address(pre(sp, -2 * wordSize))); 978 call_VM(noreg, 979 CAST_FROM_FN_PTR(address, InterpreterRuntime::update_mdp_for_ret), 980 return_bci); 981 ldp(zr, return_bci, Address(post(sp, 2 * wordSize))); 982 } 983 984 985 void InterpreterMacroAssembler::profile_taken_branch(Register mdp, 986 Register bumped_count) { 987 if (ProfileInterpreter) { 988 Label profile_continue; 989 990 // If no method data exists, go to profile_continue. 991 // Otherwise, assign to mdp 992 test_method_data_pointer(mdp, profile_continue); 993 994 // We are taking a branch. Increment the taken count. 995 // We inline increment_mdp_data_at to return bumped_count in a register 996 //increment_mdp_data_at(mdp, in_bytes(JumpData::taken_offset())); 997 Address data(mdp, in_bytes(JumpData::taken_offset())); 998 ldr(bumped_count, data); 999 assert(DataLayout::counter_increment == 1, 1000 "flow-free idiom only works with 1"); 1001 // Intel does this to catch overflow 1002 // addptr(bumped_count, DataLayout::counter_increment); 1003 // sbbptr(bumped_count, 0); 1004 // so we do this 1005 adds(bumped_count, bumped_count, DataLayout::counter_increment); 1006 Label L; 1007 br(Assembler::CS, L); // skip store if counter overflow 1008 str(bumped_count, data); 1009 bind(L); 1010 // The method data pointer needs to be updated to reflect the new target. 1011 update_mdp_by_offset(mdp, in_bytes(JumpData::displacement_offset())); 1012 bind(profile_continue); 1013 } 1014 } 1015 1016 1017 void InterpreterMacroAssembler::profile_not_taken_branch(Register mdp) { 1018 if (ProfileInterpreter) { 1019 Label profile_continue; 1020 1021 // If no method data exists, go to profile_continue. 1022 test_method_data_pointer(mdp, profile_continue); 1023 1024 // We are taking a branch. Increment the not taken count. 1025 increment_mdp_data_at(mdp, in_bytes(BranchData::not_taken_offset())); 1026 1027 // The method data pointer needs to be updated to correspond to 1028 // the next bytecode 1029 update_mdp_by_constant(mdp, in_bytes(BranchData::branch_data_size())); 1030 bind(profile_continue); 1031 } 1032 } 1033 1034 1035 void InterpreterMacroAssembler::profile_call(Register mdp) { 1036 if (ProfileInterpreter) { 1037 Label profile_continue; 1038 1039 // If no method data exists, go to profile_continue. 1040 test_method_data_pointer(mdp, profile_continue); 1041 1042 // We are making a call. Increment the count. 1043 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1044 1045 // The method data pointer needs to be updated to reflect the new target. 1046 update_mdp_by_constant(mdp, in_bytes(CounterData::counter_data_size())); 1047 bind(profile_continue); 1048 } 1049 } 1050 1051 void InterpreterMacroAssembler::profile_final_call(Register mdp) { 1052 if (ProfileInterpreter) { 1053 Label profile_continue; 1054 1055 // If no method data exists, go to profile_continue. 1056 test_method_data_pointer(mdp, profile_continue); 1057 1058 // We are making a call. Increment the count. 1059 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1060 1061 // The method data pointer needs to be updated to reflect the new target. 1062 update_mdp_by_constant(mdp, 1063 in_bytes(VirtualCallData:: 1064 virtual_call_data_size())); 1065 bind(profile_continue); 1066 } 1067 } 1068 1069 1070 void InterpreterMacroAssembler::profile_virtual_call(Register receiver, 1071 Register mdp, 1072 Register reg2, 1073 bool receiver_can_be_null) { 1074 if (ProfileInterpreter) { 1075 Label profile_continue; 1076 1077 // If no method data exists, go to profile_continue. 1078 test_method_data_pointer(mdp, profile_continue); 1079 1080 Label skip_receiver_profile; 1081 if (receiver_can_be_null) { 1082 Label not_null; 1083 // We are making a call. Increment the count for null receiver. 1084 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1085 b(skip_receiver_profile); 1086 bind(not_null); 1087 } 1088 1089 // Record the receiver type. 1090 record_klass_in_profile(receiver, mdp, reg2, true); 1091 bind(skip_receiver_profile); 1092 1093 // The method data pointer needs to be updated to reflect the new target. 1094 #if INCLUDE_JVMCI 1095 if (MethodProfileWidth == 0) { 1096 update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size())); 1097 } 1098 #else // INCLUDE_JVMCI 1099 update_mdp_by_constant(mdp, 1100 in_bytes(VirtualCallData:: 1101 virtual_call_data_size())); 1102 #endif // INCLUDE_JVMCI 1103 bind(profile_continue); 1104 } 1105 } 1106 1107 #if INCLUDE_JVMCI 1108 void InterpreterMacroAssembler::profile_called_method(Register method, Register mdp, Register reg2) { 1109 assert_different_registers(method, mdp, reg2); 1110 if (ProfileInterpreter && MethodProfileWidth > 0) { 1111 Label profile_continue; 1112 1113 // If no method data exists, go to profile_continue. 1114 test_method_data_pointer(mdp, profile_continue); 1115 1116 Label done; 1117 record_item_in_profile_helper(method, mdp, reg2, 0, done, MethodProfileWidth, 1118 &VirtualCallData::method_offset, &VirtualCallData::method_count_offset, in_bytes(VirtualCallData::nonprofiled_receiver_count_offset())); 1119 bind(done); 1120 1121 update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size())); 1122 bind(profile_continue); 1123 } 1124 } 1125 #endif // INCLUDE_JVMCI 1126 1127 // This routine creates a state machine for updating the multi-row 1128 // type profile at a virtual call site (or other type-sensitive bytecode). 1129 // The machine visits each row (of receiver/count) until the receiver type 1130 // is found, or until it runs out of rows. At the same time, it remembers 1131 // the location of the first empty row. (An empty row records null for its 1132 // receiver, and can be allocated for a newly-observed receiver type.) 1133 // Because there are two degrees of freedom in the state, a simple linear 1134 // search will not work; it must be a decision tree. Hence this helper 1135 // function is recursive, to generate the required tree structured code. 1136 // It's the interpreter, so we are trading off code space for speed. 1137 // See below for example code. 1138 void InterpreterMacroAssembler::record_klass_in_profile_helper( 1139 Register receiver, Register mdp, 1140 Register reg2, int start_row, 1141 Label& done, bool is_virtual_call) { 1142 if (TypeProfileWidth == 0) { 1143 if (is_virtual_call) { 1144 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1145 } 1146 #if INCLUDE_JVMCI 1147 else if (EnableJVMCI) { 1148 increment_mdp_data_at(mdp, in_bytes(ReceiverTypeData::nonprofiled_receiver_count_offset())); 1149 } 1150 #endif // INCLUDE_JVMCI 1151 } else { 1152 int non_profiled_offset = -1; 1153 if (is_virtual_call) { 1154 non_profiled_offset = in_bytes(CounterData::count_offset()); 1155 } 1156 #if INCLUDE_JVMCI 1157 else if (EnableJVMCI) { 1158 non_profiled_offset = in_bytes(ReceiverTypeData::nonprofiled_receiver_count_offset()); 1159 } 1160 #endif // INCLUDE_JVMCI 1161 1162 record_item_in_profile_helper(receiver, mdp, reg2, 0, done, TypeProfileWidth, 1163 &VirtualCallData::receiver_offset, &VirtualCallData::receiver_count_offset, non_profiled_offset); 1164 } 1165 } 1166 1167 void InterpreterMacroAssembler::record_item_in_profile_helper(Register item, Register mdp, 1168 Register reg2, int start_row, Label& done, int total_rows, 1169 OffsetFunction item_offset_fn, OffsetFunction item_count_offset_fn, 1170 int non_profiled_offset) { 1171 int last_row = total_rows - 1; 1172 assert(start_row <= last_row, "must be work left to do"); 1173 // Test this row for both the item and for null. 1174 // Take any of three different outcomes: 1175 // 1. found item => increment count and goto done 1176 // 2. found null => keep looking for case 1, maybe allocate this cell 1177 // 3. found something else => keep looking for cases 1 and 2 1178 // Case 3 is handled by a recursive call. 1179 for (int row = start_row; row <= last_row; row++) { 1180 Label next_test; 1181 bool test_for_null_also = (row == start_row); 1182 1183 // See if the item is item[n]. 1184 int item_offset = in_bytes(item_offset_fn(row)); 1185 test_mdp_data_at(mdp, item_offset, item, 1186 (test_for_null_also ? reg2 : noreg), 1187 next_test); 1188 // (Reg2 now contains the item from the CallData.) 1189 1190 // The item is item[n]. Increment count[n]. 1191 int count_offset = in_bytes(item_count_offset_fn(row)); 1192 increment_mdp_data_at(mdp, count_offset); 1193 b(done); 1194 bind(next_test); 1195 1196 if (test_for_null_also) { 1197 Label found_null; 1198 // Failed the equality check on item[n]... Test for null. 1199 if (start_row == last_row) { 1200 // The only thing left to do is handle the null case. 1201 if (non_profiled_offset >= 0) { 1202 cbz(reg2, found_null); 1203 // Item did not match any saved item and there is no empty row for it. 1204 // Increment total counter to indicate polymorphic case. 1205 increment_mdp_data_at(mdp, non_profiled_offset); 1206 b(done); 1207 bind(found_null); 1208 } else { 1209 cbnz(reg2, done); 1210 } 1211 break; 1212 } 1213 // Since null is rare, make it be the branch-taken case. 1214 cbz(reg2, found_null); 1215 1216 // Put all the "Case 3" tests here. 1217 record_item_in_profile_helper(item, mdp, reg2, start_row + 1, done, total_rows, 1218 item_offset_fn, item_count_offset_fn, non_profiled_offset); 1219 1220 // Found a null. Keep searching for a matching item, 1221 // but remember that this is an empty (unused) slot. 1222 bind(found_null); 1223 } 1224 } 1225 1226 // In the fall-through case, we found no matching item, but we 1227 // observed the item[start_row] is NULL. 1228 1229 // Fill in the item field and increment the count. 1230 int item_offset = in_bytes(item_offset_fn(start_row)); 1231 set_mdp_data_at(mdp, item_offset, item); 1232 int count_offset = in_bytes(item_count_offset_fn(start_row)); 1233 mov(reg2, DataLayout::counter_increment); 1234 set_mdp_data_at(mdp, count_offset, reg2); 1235 if (start_row > 0) { 1236 b(done); 1237 } 1238 } 1239 1240 // Example state machine code for three profile rows: 1241 // // main copy of decision tree, rooted at row[1] 1242 // if (row[0].rec == rec) { row[0].incr(); goto done; } 1243 // if (row[0].rec != NULL) { 1244 // // inner copy of decision tree, rooted at row[1] 1245 // if (row[1].rec == rec) { row[1].incr(); goto done; } 1246 // if (row[1].rec != NULL) { 1247 // // degenerate decision tree, rooted at row[2] 1248 // if (row[2].rec == rec) { row[2].incr(); goto done; } 1249 // if (row[2].rec != NULL) { count.incr(); goto done; } // overflow 1250 // row[2].init(rec); goto done; 1251 // } else { 1252 // // remember row[1] is empty 1253 // if (row[2].rec == rec) { row[2].incr(); goto done; } 1254 // row[1].init(rec); goto done; 1255 // } 1256 // } else { 1257 // // remember row[0] is empty 1258 // if (row[1].rec == rec) { row[1].incr(); goto done; } 1259 // if (row[2].rec == rec) { row[2].incr(); goto done; } 1260 // row[0].init(rec); goto done; 1261 // } 1262 // done: 1263 1264 void InterpreterMacroAssembler::record_klass_in_profile(Register receiver, 1265 Register mdp, Register reg2, 1266 bool is_virtual_call) { 1267 assert(ProfileInterpreter, "must be profiling"); 1268 Label done; 1269 1270 record_klass_in_profile_helper(receiver, mdp, reg2, 0, done, is_virtual_call); 1271 1272 bind (done); 1273 } 1274 1275 void InterpreterMacroAssembler::profile_ret(Register return_bci, 1276 Register mdp) { 1277 if (ProfileInterpreter) { 1278 Label profile_continue; 1279 uint row; 1280 1281 // If no method data exists, go to profile_continue. 1282 test_method_data_pointer(mdp, profile_continue); 1283 1284 // Update the total ret count. 1285 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); 1286 1287 for (row = 0; row < RetData::row_limit(); row++) { 1288 Label next_test; 1289 1290 // See if return_bci is equal to bci[n]: 1291 test_mdp_data_at(mdp, 1292 in_bytes(RetData::bci_offset(row)), 1293 return_bci, noreg, 1294 next_test); 1295 1296 // return_bci is equal to bci[n]. Increment the count. 1297 increment_mdp_data_at(mdp, in_bytes(RetData::bci_count_offset(row))); 1298 1299 // The method data pointer needs to be updated to reflect the new target. 1300 update_mdp_by_offset(mdp, 1301 in_bytes(RetData::bci_displacement_offset(row))); 1302 b(profile_continue); 1303 bind(next_test); 1304 } 1305 1306 update_mdp_for_ret(return_bci); 1307 1308 bind(profile_continue); 1309 } 1310 } 1311 1312 void InterpreterMacroAssembler::profile_null_seen(Register mdp) { 1313 if (ProfileInterpreter) { 1314 Label profile_continue; 1315 1316 // If no method data exists, go to profile_continue. 1317 test_method_data_pointer(mdp, profile_continue); 1318 1319 set_mdp_flag_at(mdp, BitData::null_seen_byte_constant()); 1320 1321 // The method data pointer needs to be updated. 1322 int mdp_delta = in_bytes(BitData::bit_data_size()); 1323 if (TypeProfileCasts) { 1324 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size()); 1325 } 1326 update_mdp_by_constant(mdp, mdp_delta); 1327 1328 bind(profile_continue); 1329 } 1330 } 1331 1332 void InterpreterMacroAssembler::profile_typecheck_failed(Register mdp) { 1333 if (ProfileInterpreter && TypeProfileCasts) { 1334 Label profile_continue; 1335 1336 // If no method data exists, go to profile_continue. 1337 test_method_data_pointer(mdp, profile_continue); 1338 1339 int count_offset = in_bytes(CounterData::count_offset()); 1340 // Back up the address, since we have already bumped the mdp. 1341 count_offset -= in_bytes(VirtualCallData::virtual_call_data_size()); 1342 1343 // *Decrement* the counter. We expect to see zero or small negatives. 1344 increment_mdp_data_at(mdp, count_offset, true); 1345 1346 bind (profile_continue); 1347 } 1348 } 1349 1350 void InterpreterMacroAssembler::profile_typecheck(Register mdp, Register klass, Register reg2) { 1351 if (ProfileInterpreter) { 1352 Label profile_continue; 1353 1354 // If no method data exists, go to profile_continue. 1355 test_method_data_pointer(mdp, profile_continue); 1356 1357 // The method data pointer needs to be updated. 1358 int mdp_delta = in_bytes(BitData::bit_data_size()); 1359 if (TypeProfileCasts) { 1360 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size()); 1361 1362 // Record the object type. 1363 record_klass_in_profile(klass, mdp, reg2, false); 1364 } 1365 update_mdp_by_constant(mdp, mdp_delta); 1366 1367 bind(profile_continue); 1368 } 1369 } 1370 1371 void InterpreterMacroAssembler::profile_switch_default(Register mdp) { 1372 if (ProfileInterpreter) { 1373 Label profile_continue; 1374 1375 // If no method data exists, go to profile_continue. 1376 test_method_data_pointer(mdp, profile_continue); 1377 1378 // Update the default case count 1379 increment_mdp_data_at(mdp, 1380 in_bytes(MultiBranchData::default_count_offset())); 1381 1382 // The method data pointer needs to be updated. 1383 update_mdp_by_offset(mdp, 1384 in_bytes(MultiBranchData:: 1385 default_displacement_offset())); 1386 1387 bind(profile_continue); 1388 } 1389 } 1390 1391 void InterpreterMacroAssembler::profile_switch_case(Register index, 1392 Register mdp, 1393 Register reg2) { 1394 if (ProfileInterpreter) { 1395 Label profile_continue; 1396 1397 // If no method data exists, go to profile_continue. 1398 test_method_data_pointer(mdp, profile_continue); 1399 1400 // Build the base (index * per_case_size_in_bytes()) + 1401 // case_array_offset_in_bytes() 1402 movw(reg2, in_bytes(MultiBranchData::per_case_size())); 1403 movw(rscratch1, in_bytes(MultiBranchData::case_array_offset())); 1404 Assembler::maddw(index, index, reg2, rscratch1); 1405 1406 // Update the case count 1407 increment_mdp_data_at(mdp, 1408 index, 1409 in_bytes(MultiBranchData::relative_count_offset())); 1410 1411 // The method data pointer needs to be updated. 1412 update_mdp_by_offset(mdp, 1413 index, 1414 in_bytes(MultiBranchData:: 1415 relative_displacement_offset())); 1416 1417 bind(profile_continue); 1418 } 1419 } 1420 1421 void InterpreterMacroAssembler::verify_oop(Register reg, TosState state) { 1422 if (state == atos) { 1423 MacroAssembler::verify_oop(reg); 1424 } 1425 } 1426 1427 void InterpreterMacroAssembler::verify_FPU(int stack_depth, TosState state) { ; } 1428 1429 1430 void InterpreterMacroAssembler::notify_method_entry() { 1431 // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to 1432 // track stack depth. If it is possible to enter interp_only_mode we add 1433 // the code to check if the event should be sent. 1434 if (JvmtiExport::can_post_interpreter_events()) { 1435 Label L; 1436 ldrw(r3, Address(rthread, JavaThread::interp_only_mode_offset())); 1437 cbzw(r3, L); 1438 call_VM(noreg, CAST_FROM_FN_PTR(address, 1439 InterpreterRuntime::post_method_entry)); 1440 bind(L); 1441 } 1442 1443 { 1444 SkipIfEqual skip(this, &DTraceMethodProbes, false); 1445 get_method(c_rarg1); 1446 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), 1447 rthread, c_rarg1); 1448 } 1449 1450 // RedefineClasses() tracing support for obsolete method entry 1451 if (log_is_enabled(Trace, redefine, class, obsolete)) { 1452 get_method(c_rarg1); 1453 call_VM_leaf( 1454 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry), 1455 rthread, c_rarg1); 1456 } 1457 1458 } 1459 1460 1461 void InterpreterMacroAssembler::notify_method_exit( 1462 TosState state, NotifyMethodExitMode mode) { 1463 // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to 1464 // track stack depth. If it is possible to enter interp_only_mode we add 1465 // the code to check if the event should be sent. 1466 if (mode == NotifyJVMTI && JvmtiExport::can_post_interpreter_events()) { 1467 Label L; 1468 // Note: frame::interpreter_frame_result has a dependency on how the 1469 // method result is saved across the call to post_method_exit. If this 1470 // is changed then the interpreter_frame_result implementation will 1471 // need to be updated too. 1472 1473 // template interpreter will leave the result on the top of the stack. 1474 push(state); 1475 ldrw(r3, Address(rthread, JavaThread::interp_only_mode_offset())); 1476 cbz(r3, L); 1477 call_VM(noreg, 1478 CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit)); 1479 bind(L); 1480 pop(state); 1481 } 1482 1483 { 1484 SkipIfEqual skip(this, &DTraceMethodProbes, false); 1485 push(state); 1486 get_method(c_rarg1); 1487 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), 1488 rthread, c_rarg1); 1489 pop(state); 1490 } 1491 } 1492 1493 1494 // Jump if ((*counter_addr += increment) & mask) satisfies the condition. 1495 void InterpreterMacroAssembler::increment_mask_and_jump(Address counter_addr, 1496 int increment, Address mask, 1497 Register scratch, Register scratch2, 1498 bool preloaded, Condition cond, 1499 Label* where) { 1500 if (!preloaded) { 1501 ldrw(scratch, counter_addr); 1502 } 1503 add(scratch, scratch, increment); 1504 strw(scratch, counter_addr); 1505 ldrw(scratch2, mask); 1506 ands(scratch, scratch, scratch2); 1507 br(cond, *where); 1508 } 1509 1510 void InterpreterMacroAssembler::call_VM_leaf_base(address entry_point, 1511 int number_of_arguments) { 1512 // interpreter specific 1513 // 1514 // Note: No need to save/restore rbcp & rlocals pointer since these 1515 // are callee saved registers and no blocking/ GC can happen 1516 // in leaf calls. 1517 #ifdef ASSERT 1518 { 1519 Label L; 1520 ldr(rscratch1, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); 1521 cbz(rscratch1, L); 1522 stop("InterpreterMacroAssembler::call_VM_leaf_base:" 1523 " last_sp != NULL"); 1524 bind(L); 1525 } 1526 #endif /* ASSERT */ 1527 // super call 1528 MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments); 1529 } 1530 1531 void InterpreterMacroAssembler::call_VM_base(Register oop_result, 1532 Register java_thread, 1533 Register last_java_sp, 1534 address entry_point, 1535 int number_of_arguments, 1536 bool check_exceptions) { 1537 // interpreter specific 1538 // 1539 // Note: Could avoid restoring locals ptr (callee saved) - however doesn't 1540 // really make a difference for these runtime calls, since they are 1541 // slow anyway. Btw., bcp must be saved/restored since it may change 1542 // due to GC. 1543 // assert(java_thread == noreg , "not expecting a precomputed java thread"); 1544 save_bcp(); 1545 #ifdef ASSERT 1546 { 1547 Label L; 1548 ldr(rscratch1, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); 1549 cbz(rscratch1, L); 1550 stop("InterpreterMacroAssembler::call_VM_leaf_base:" 1551 " last_sp != NULL"); 1552 bind(L); 1553 } 1554 #endif /* ASSERT */ 1555 // super call 1556 MacroAssembler::call_VM_base(oop_result, noreg, last_java_sp, 1557 entry_point, number_of_arguments, 1558 check_exceptions); 1559 // interpreter specific 1560 restore_bcp(); 1561 restore_locals(); 1562 } 1563 1564 void InterpreterMacroAssembler::profile_obj_type(Register obj, const Address& mdo_addr) { 1565 Label update, next, none; 1566 1567 verify_oop(obj); 1568 1569 cbnz(obj, update); 1570 orptr(mdo_addr, TypeEntries::null_seen); 1571 b(next); 1572 1573 bind(update); 1574 load_klass(obj, obj); 1575 1576 ldr(rscratch1, mdo_addr); 1577 eor(obj, obj, rscratch1); 1578 tst(obj, TypeEntries::type_klass_mask); 1579 br(Assembler::EQ, next); // klass seen before, nothing to 1580 // do. The unknown bit may have been 1581 // set already but no need to check. 1582 1583 tbnz(obj, exact_log2(TypeEntries::type_unknown), next); 1584 // already unknown. Nothing to do anymore. 1585 1586 ldr(rscratch1, mdo_addr); 1587 cbz(rscratch1, none); 1588 cmp(rscratch1, TypeEntries::null_seen); 1589 br(Assembler::EQ, none); 1590 // There is a chance that the checks above (re-reading profiling 1591 // data from memory) fail if another thread has just set the 1592 // profiling to this obj's klass 1593 ldr(rscratch1, mdo_addr); 1594 eor(obj, obj, rscratch1); 1595 tst(obj, TypeEntries::type_klass_mask); 1596 br(Assembler::EQ, next); 1597 1598 // different than before. Cannot keep accurate profile. 1599 orptr(mdo_addr, TypeEntries::type_unknown); 1600 b(next); 1601 1602 bind(none); 1603 // first time here. Set profile type. 1604 str(obj, mdo_addr); 1605 1606 bind(next); 1607 } 1608 1609 void InterpreterMacroAssembler::profile_arguments_type(Register mdp, Register callee, Register tmp, bool is_virtual) { 1610 if (!ProfileInterpreter) { 1611 return; 1612 } 1613 1614 if (MethodData::profile_arguments() || MethodData::profile_return()) { 1615 Label profile_continue; 1616 1617 test_method_data_pointer(mdp, profile_continue); 1618 1619 int off_to_start = is_virtual ? in_bytes(VirtualCallData::virtual_call_data_size()) : in_bytes(CounterData::counter_data_size()); 1620 1621 ldrb(rscratch1, Address(mdp, in_bytes(DataLayout::tag_offset()) - off_to_start)); 1622 cmp(rscratch1, is_virtual ? DataLayout::virtual_call_type_data_tag : DataLayout::call_type_data_tag); 1623 br(Assembler::NE, profile_continue); 1624 1625 if (MethodData::profile_arguments()) { 1626 Label done; 1627 int off_to_args = in_bytes(TypeEntriesAtCall::args_data_offset()); 1628 1629 for (int i = 0; i < TypeProfileArgsLimit; i++) { 1630 if (i > 0 || MethodData::profile_return()) { 1631 // If return value type is profiled we may have no argument to profile 1632 ldr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset()))); 1633 sub(tmp, tmp, i*TypeStackSlotEntries::per_arg_count()); 1634 cmp(tmp, TypeStackSlotEntries::per_arg_count()); 1635 add(rscratch1, mdp, off_to_args); 1636 br(Assembler::LT, done); 1637 } 1638 ldr(tmp, Address(callee, Method::const_offset())); 1639 load_unsigned_short(tmp, Address(tmp, ConstMethod::size_of_parameters_offset())); 1640 // stack offset o (zero based) from the start of the argument 1641 // list, for n arguments translates into offset n - o - 1 from 1642 // the end of the argument list 1643 ldr(rscratch1, Address(mdp, in_bytes(TypeEntriesAtCall::stack_slot_offset(i)))); 1644 sub(tmp, tmp, rscratch1); 1645 sub(tmp, tmp, 1); 1646 Address arg_addr = argument_address(tmp); 1647 ldr(tmp, arg_addr); 1648 1649 Address mdo_arg_addr(mdp, in_bytes(TypeEntriesAtCall::argument_type_offset(i))); 1650 profile_obj_type(tmp, mdo_arg_addr); 1651 1652 int to_add = in_bytes(TypeStackSlotEntries::per_arg_size()); 1653 off_to_args += to_add; 1654 } 1655 1656 if (MethodData::profile_return()) { 1657 ldr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset()))); 1658 sub(tmp, tmp, TypeProfileArgsLimit*TypeStackSlotEntries::per_arg_count()); 1659 } 1660 1661 add(rscratch1, mdp, off_to_args); 1662 bind(done); 1663 mov(mdp, rscratch1); 1664 1665 if (MethodData::profile_return()) { 1666 // We're right after the type profile for the last 1667 // argument. tmp is the number of cells left in the 1668 // CallTypeData/VirtualCallTypeData to reach its end. Non null 1669 // if there's a return to profile. 1670 assert(ReturnTypeEntry::static_cell_count() < TypeStackSlotEntries::per_arg_count(), "can't move past ret type"); 1671 add(mdp, mdp, tmp, LSL, exact_log2(DataLayout::cell_size)); 1672 } 1673 str(mdp, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); 1674 } else { 1675 assert(MethodData::profile_return(), "either profile call args or call ret"); 1676 update_mdp_by_constant(mdp, in_bytes(TypeEntriesAtCall::return_only_size())); 1677 } 1678 1679 // mdp points right after the end of the 1680 // CallTypeData/VirtualCallTypeData, right after the cells for the 1681 // return value type if there's one 1682 1683 bind(profile_continue); 1684 } 1685 } 1686 1687 void InterpreterMacroAssembler::profile_return_type(Register mdp, Register ret, Register tmp) { 1688 assert_different_registers(mdp, ret, tmp, rbcp); 1689 if (ProfileInterpreter && MethodData::profile_return()) { 1690 Label profile_continue, done; 1691 1692 test_method_data_pointer(mdp, profile_continue); 1693 1694 if (MethodData::profile_return_jsr292_only()) { 1695 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2"); 1696 1697 // If we don't profile all invoke bytecodes we must make sure 1698 // it's a bytecode we indeed profile. We can't go back to the 1699 // begining of the ProfileData we intend to update to check its 1700 // type because we're right after it and we don't known its 1701 // length 1702 Label do_profile; 1703 ldrb(rscratch1, Address(rbcp, 0)); 1704 cmp(rscratch1, Bytecodes::_invokedynamic); 1705 br(Assembler::EQ, do_profile); 1706 cmp(rscratch1, Bytecodes::_invokehandle); 1707 br(Assembler::EQ, do_profile); 1708 get_method(tmp); 1709 ldrh(rscratch1, Address(tmp, Method::intrinsic_id_offset_in_bytes())); 1710 cmp(rscratch1, vmIntrinsics::_compiledLambdaForm); 1711 br(Assembler::NE, profile_continue); 1712 1713 bind(do_profile); 1714 } 1715 1716 Address mdo_ret_addr(mdp, -in_bytes(ReturnTypeEntry::size())); 1717 mov(tmp, ret); 1718 profile_obj_type(tmp, mdo_ret_addr); 1719 1720 bind(profile_continue); 1721 } 1722 } 1723 1724 void InterpreterMacroAssembler::profile_parameters_type(Register mdp, Register tmp1, Register tmp2) { 1725 if (ProfileInterpreter && MethodData::profile_parameters()) { 1726 Label profile_continue, done; 1727 1728 test_method_data_pointer(mdp, profile_continue); 1729 1730 // Load the offset of the area within the MDO used for 1731 // parameters. If it's negative we're not profiling any parameters 1732 ldr(tmp1, Address(mdp, in_bytes(MethodData::parameters_type_data_di_offset()) - in_bytes(MethodData::data_offset()))); 1733 cmp(tmp1, 0u); 1734 br(Assembler::LT, profile_continue); 1735 1736 // Compute a pointer to the area for parameters from the offset 1737 // and move the pointer to the slot for the last 1738 // parameters. Collect profiling from last parameter down. 1739 // mdo start + parameters offset + array length - 1 1740 add(mdp, mdp, tmp1); 1741 ldr(tmp1, Address(mdp, ArrayData::array_len_offset())); 1742 sub(tmp1, tmp1, TypeStackSlotEntries::per_arg_count()); 1743 1744 Label loop; 1745 bind(loop); 1746 1747 int off_base = in_bytes(ParametersTypeData::stack_slot_offset(0)); 1748 int type_base = in_bytes(ParametersTypeData::type_offset(0)); 1749 int per_arg_scale = exact_log2(DataLayout::cell_size); 1750 add(rscratch1, mdp, off_base); 1751 add(rscratch2, mdp, type_base); 1752 1753 Address arg_off(rscratch1, tmp1, Address::lsl(per_arg_scale)); 1754 Address arg_type(rscratch2, tmp1, Address::lsl(per_arg_scale)); 1755 1756 // load offset on the stack from the slot for this parameter 1757 ldr(tmp2, arg_off); 1758 neg(tmp2, tmp2); 1759 // read the parameter from the local area 1760 ldr(tmp2, Address(rlocals, tmp2, Address::lsl(Interpreter::logStackElementSize))); 1761 1762 // profile the parameter 1763 profile_obj_type(tmp2, arg_type); 1764 1765 // go to next parameter 1766 subs(tmp1, tmp1, TypeStackSlotEntries::per_arg_count()); 1767 br(Assembler::GE, loop); 1768 1769 bind(profile_continue); 1770 } 1771 }