1 /*
2 * Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, 2020, 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 "asm/macroAssembler.inline.hpp"
28 #include "compiler/compiler_globals.hpp"
29 #include "gc/shared/barrierSet.hpp"
30 #include "gc/shared/barrierSetAssembler.hpp"
31 #include "interp_masm_aarch64.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "interpreter/interpreterRuntime.hpp"
34 #include "logging/log.hpp"
35 #include "oops/arrayOop.hpp"
36 #include "oops/markWord.hpp"
37 #include "oops/method.hpp"
38 #include "oops/methodData.hpp"
39 #include "oops/resolvedFieldEntry.hpp"
40 #include "oops/resolvedIndyEntry.hpp"
41 #include "oops/resolvedMethodEntry.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "prims/jvmtiThreadState.hpp"
44 #include "runtime/basicLock.hpp"
45 #include "runtime/frame.inline.hpp"
46 #include "runtime/javaThread.hpp"
47 #include "runtime/safepointMechanism.hpp"
48 #include "runtime/sharedRuntime.hpp"
49 #include "utilities/powerOfTwo.hpp"
50
51 void InterpreterMacroAssembler::narrow(Register result) {
52
53 // Get method->_constMethod->_result_type
54 ldr(rscratch1, Address(rfp, frame::interpreter_frame_method_offset * wordSize));
55 ldr(rscratch1, Address(rscratch1, Method::const_offset()));
56 ldrb(rscratch1, Address(rscratch1, ConstMethod::result_type_offset()));
57
58 Label done, notBool, notByte, notChar;
59
60 // common case first
61 cmpw(rscratch1, T_INT);
62 br(Assembler::EQ, done);
63
64 // mask integer result to narrower return type.
65 cmpw(rscratch1, T_BOOLEAN);
66 br(Assembler::NE, notBool);
67 andw(result, result, 0x1);
68 b(done);
69
70 bind(notBool);
71 cmpw(rscratch1, T_BYTE);
72 br(Assembler::NE, notByte);
73 sbfx(result, result, 0, 8);
74 b(done);
75
76 bind(notByte);
77 cmpw(rscratch1, T_CHAR);
78 br(Assembler::NE, notChar);
79 ubfx(result, result, 0, 16); // truncate upper 16 bits
80 b(done);
81
82 bind(notChar);
83 sbfx(result, result, 0, 16); // sign-extend short
84
85 // Nothing to do for T_INT
86 bind(done);
87 }
88
89 void InterpreterMacroAssembler::jump_to_entry(address entry) {
90 assert(entry, "Entry must have been generated by now");
91 b(entry);
92 }
93
94 void InterpreterMacroAssembler::check_and_handle_popframe(Register java_thread) {
95 if (JvmtiExport::can_pop_frame()) {
96 Label L;
97 // Initiate popframe handling only if it is not already being
98 // processed. If the flag has the popframe_processing bit set, it
99 // means that this code is called *during* popframe handling - we
100 // don't want to reenter.
101 // This method is only called just after the call into the vm in
102 // call_VM_base, so the arg registers are available.
103 ldrw(rscratch1, Address(rthread, JavaThread::popframe_condition_offset()));
104 tbz(rscratch1, exact_log2(JavaThread::popframe_pending_bit), L);
105 tbnz(rscratch1, exact_log2(JavaThread::popframe_processing_bit), L);
106 // Call Interpreter::remove_activation_preserving_args_entry() to get the
107 // address of the same-named entrypoint in the generated interpreter code.
108 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_preserving_args_entry));
109 br(r0);
110 bind(L);
111 }
112 }
113
114
115 void InterpreterMacroAssembler::load_earlyret_value(TosState state) {
116 ldr(r2, Address(rthread, JavaThread::jvmti_thread_state_offset()));
117 const Address tos_addr(r2, JvmtiThreadState::earlyret_tos_offset());
118 const Address oop_addr(r2, JvmtiThreadState::earlyret_oop_offset());
119 const Address val_addr(r2, JvmtiThreadState::earlyret_value_offset());
120 switch (state) {
121 case atos: ldr(r0, oop_addr);
122 str(zr, oop_addr);
123 interp_verify_oop(r0, state); break;
124 case ltos: ldr(r0, val_addr); break;
125 case btos: // fall through
126 case ztos: // fall through
127 case ctos: // fall through
128 case stos: // fall through
129 case itos: ldrw(r0, val_addr); break;
130 case ftos: ldrs(v0, val_addr); break;
131 case dtos: ldrd(v0, val_addr); break;
132 case vtos: /* nothing to do */ break;
133 default : ShouldNotReachHere();
134 }
135 // Clean up tos value in the thread object
136 movw(rscratch1, (int) ilgl);
137 strw(rscratch1, tos_addr);
138 strw(zr, val_addr);
139 }
140
141
142 void InterpreterMacroAssembler::check_and_handle_earlyret(Register java_thread) {
143 if (JvmtiExport::can_force_early_return()) {
144 Label L;
145 ldr(rscratch1, Address(rthread, JavaThread::jvmti_thread_state_offset()));
146 cbz(rscratch1, L); // if (thread->jvmti_thread_state() == nullptr) exit;
147
148 // Initiate earlyret handling only if it is not already being processed.
149 // If the flag has the earlyret_processing bit set, it means that this code
150 // is called *during* earlyret handling - we don't want to reenter.
151 ldrw(rscratch1, Address(rscratch1, JvmtiThreadState::earlyret_state_offset()));
152 cmpw(rscratch1, JvmtiThreadState::earlyret_pending);
153 br(Assembler::NE, L);
154
155 // Call Interpreter::remove_activation_early_entry() to get the address of the
156 // same-named entrypoint in the generated interpreter code.
157 ldr(rscratch1, Address(rthread, JavaThread::jvmti_thread_state_offset()));
158 ldrw(rscratch1, Address(rscratch1, JvmtiThreadState::earlyret_tos_offset()));
159 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_early_entry), rscratch1);
160 br(r0);
161 bind(L);
162 }
163 }
164
165 void InterpreterMacroAssembler::get_unsigned_2_byte_index_at_bcp(
166 Register reg,
167 int bcp_offset) {
168 assert(bcp_offset >= 0, "bcp is still pointing to start of bytecode");
169 ldrh(reg, Address(rbcp, bcp_offset));
170 rev16(reg, reg);
171 }
172
173 void InterpreterMacroAssembler::get_dispatch() {
174 uint64_t offset;
175 adrp(rdispatch, ExternalAddress((address)Interpreter::dispatch_table()), offset);
176 // Use add() here after ARDP, rather than lea().
177 // lea() does not generate anything if its offset is zero.
178 // However, relocs expect to find either an ADD or a load/store
179 // insn after an ADRP. add() always generates an ADD insn, even
180 // for add(Rn, Rn, 0).
181 add(rdispatch, rdispatch, offset);
182 }
183
184 void InterpreterMacroAssembler::get_cache_index_at_bcp(Register index,
185 int bcp_offset,
186 size_t index_size) {
187 assert(bcp_offset > 0, "bcp is still pointing to start of bytecode");
188 if (index_size == sizeof(u2)) {
189 load_unsigned_short(index, Address(rbcp, bcp_offset));
190 } else if (index_size == sizeof(u4)) {
191 // assert(EnableInvokeDynamic, "giant index used only for JSR 292");
192 ldrw(index, Address(rbcp, bcp_offset));
193 } else if (index_size == sizeof(u1)) {
194 load_unsigned_byte(index, Address(rbcp, bcp_offset));
195 } else {
196 ShouldNotReachHere();
197 }
198 }
199
200 void InterpreterMacroAssembler::get_method_counters(Register method,
201 Register mcs, Label& skip) {
202 Label has_counters;
203 ldr(mcs, Address(method, Method::method_counters_offset()));
204 cbnz(mcs, has_counters);
205 call_VM(noreg, CAST_FROM_FN_PTR(address,
206 InterpreterRuntime::build_method_counters), method);
207 ldr(mcs, Address(method, Method::method_counters_offset()));
208 cbz(mcs, skip); // No MethodCounters allocated, OutOfMemory
209 bind(has_counters);
210 }
211
212 // Load object from cpool->resolved_references(index)
213 void InterpreterMacroAssembler::load_resolved_reference_at_index(
214 Register result, Register index, Register tmp) {
215 assert_different_registers(result, index);
216
217 get_constant_pool(result);
218 // load pointer for resolved_references[] objArray
219 ldr(result, Address(result, ConstantPool::cache_offset()));
220 ldr(result, Address(result, ConstantPoolCache::resolved_references_offset()));
221 resolve_oop_handle(result, tmp, rscratch2);
222 // Add in the index
223 add(index, index, arrayOopDesc::base_offset_in_bytes(T_OBJECT) >> LogBytesPerHeapOop);
224 load_heap_oop(result, Address(result, index, Address::uxtw(LogBytesPerHeapOop)), tmp, rscratch2);
225 }
226
227 void InterpreterMacroAssembler::load_resolved_klass_at_offset(
228 Register cpool, Register index, Register klass, Register temp) {
229 add(temp, cpool, index, LSL, LogBytesPerWord);
230 ldrh(temp, Address(temp, sizeof(ConstantPool))); // temp = resolved_klass_index
231 ldr(klass, Address(cpool, ConstantPool::resolved_klasses_offset())); // klass = cpool->_resolved_klasses
232 add(klass, klass, temp, LSL, LogBytesPerWord);
233 ldr(klass, Address(klass, Array<Klass*>::base_offset_in_bytes()));
234 }
235
236 // Generate a subtype check: branch to ok_is_subtype if sub_klass is a
237 // subtype of super_klass.
238 //
239 // Args:
240 // r0: superklass
241 // Rsub_klass: subklass
242 //
243 // Kills:
244 // r2, r5
245 void InterpreterMacroAssembler::gen_subtype_check(Register Rsub_klass,
246 Label& ok_is_subtype) {
247 assert(Rsub_klass != r0, "r0 holds superklass");
248 assert(Rsub_klass != r2, "r2 holds 2ndary super array length");
249 assert(Rsub_klass != r5, "r5 holds 2ndary super array scan ptr");
250
251 // Profile the not-null value's klass.
252 profile_typecheck(r2, Rsub_klass, r5); // blows r2, reloads r5
253
254 // Do the check.
255 check_klass_subtype(Rsub_klass, r0, r2, ok_is_subtype); // blows r2
256 }
257
258 // Java Expression Stack
259
260 void InterpreterMacroAssembler::pop_ptr(Register r) {
261 ldr(r, post(esp, wordSize));
262 }
263
264 void InterpreterMacroAssembler::pop_i(Register r) {
265 ldrw(r, post(esp, wordSize));
266 }
267
268 void InterpreterMacroAssembler::pop_l(Register r) {
269 ldr(r, post(esp, 2 * Interpreter::stackElementSize));
270 }
271
272 void InterpreterMacroAssembler::push_ptr(Register r) {
273 str(r, pre(esp, -wordSize));
274 }
275
276 void InterpreterMacroAssembler::push_i(Register r) {
277 str(r, pre(esp, -wordSize));
278 }
279
280 void InterpreterMacroAssembler::push_l(Register r) {
281 str(zr, pre(esp, -wordSize));
282 str(r, pre(esp, - wordSize));
283 }
284
285 void InterpreterMacroAssembler::pop_f(FloatRegister r) {
286 ldrs(r, post(esp, wordSize));
287 }
288
289 void InterpreterMacroAssembler::pop_d(FloatRegister r) {
290 ldrd(r, post(esp, 2 * Interpreter::stackElementSize));
291 }
292
293 void InterpreterMacroAssembler::push_f(FloatRegister r) {
294 strs(r, pre(esp, -wordSize));
295 }
296
297 void InterpreterMacroAssembler::push_d(FloatRegister r) {
298 strd(r, pre(esp, 2* -wordSize));
299 }
300
301 void InterpreterMacroAssembler::pop(TosState state) {
302 switch (state) {
303 case atos: pop_ptr(); break;
304 case btos:
305 case ztos:
306 case ctos:
307 case stos:
308 case itos: pop_i(); break;
309 case ltos: pop_l(); break;
310 case ftos: pop_f(); break;
311 case dtos: pop_d(); break;
312 case vtos: /* nothing to do */ break;
313 default: ShouldNotReachHere();
314 }
315 interp_verify_oop(r0, state);
316 }
317
318 void InterpreterMacroAssembler::push(TosState state) {
319 interp_verify_oop(r0, state);
320 switch (state) {
321 case atos: push_ptr(); break;
322 case btos:
323 case ztos:
324 case ctos:
325 case stos:
326 case itos: push_i(); break;
327 case ltos: push_l(); break;
328 case ftos: push_f(); break;
329 case dtos: push_d(); break;
330 case vtos: /* nothing to do */ break;
331 default : ShouldNotReachHere();
332 }
333 }
334
335 // Helpers for swap and dup
336 void InterpreterMacroAssembler::load_ptr(int n, Register val) {
337 ldr(val, Address(esp, Interpreter::expr_offset_in_bytes(n)));
338 }
339
340 void InterpreterMacroAssembler::store_ptr(int n, Register val) {
341 str(val, Address(esp, Interpreter::expr_offset_in_bytes(n)));
342 }
343
344 void InterpreterMacroAssembler::load_float(Address src) {
345 ldrs(v0, src);
346 }
347
348 void InterpreterMacroAssembler::load_double(Address src) {
349 ldrd(v0, src);
350 }
351
352 void InterpreterMacroAssembler::prepare_to_jump_from_interpreted() {
353 // set sender sp
354 mov(r19_sender_sp, sp);
355 // record last_sp
356 sub(rscratch1, esp, rfp);
357 asr(rscratch1, rscratch1, Interpreter::logStackElementSize);
358 str(rscratch1, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
359 }
360
361 // Jump to from_interpreted entry of a call unless single stepping is possible
362 // in this thread in which case we must call the i2i entry
363 void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) {
364 prepare_to_jump_from_interpreted();
365
366 if (JvmtiExport::can_post_interpreter_events()) {
367 Label run_compiled_code;
368 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
369 // compiled code in threads for which the event is enabled. Check here for
370 // interp_only_mode if these events CAN be enabled.
371 ldrw(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset()));
372 cbzw(rscratch1, run_compiled_code);
373 ldr(rscratch1, Address(method, Method::interpreter_entry_offset()));
374 br(rscratch1);
375 bind(run_compiled_code);
376 }
377
378 ldr(rscratch1, Address(method, Method::from_interpreted_offset()));
379 br(rscratch1);
380 }
381
382 // The following two routines provide a hook so that an implementation
383 // can schedule the dispatch in two parts. amd64 does not do this.
384 void InterpreterMacroAssembler::dispatch_prolog(TosState state, int step) {
385 }
386
387 void InterpreterMacroAssembler::dispatch_epilog(TosState state, int step) {
388 dispatch_next(state, step);
389 }
390
391 void InterpreterMacroAssembler::dispatch_base(TosState state,
392 address* table,
393 bool verifyoop,
394 bool generate_poll) {
395 if (VerifyActivationFrameSize) {
396 Unimplemented();
397 }
398 if (verifyoop) {
399 interp_verify_oop(r0, state);
400 }
401
402 Label safepoint;
403 address* const safepoint_table = Interpreter::safept_table(state);
404 bool needs_thread_local_poll = generate_poll && table != safepoint_table;
405
406 if (needs_thread_local_poll) {
407 NOT_PRODUCT(block_comment("Thread-local Safepoint poll"));
408 ldr(rscratch2, Address(rthread, JavaThread::polling_word_offset()));
409 tbnz(rscratch2, exact_log2(SafepointMechanism::poll_bit()), safepoint);
410 }
411
412 if (table == Interpreter::dispatch_table(state)) {
413 addw(rscratch2, rscratch1, Interpreter::distance_from_dispatch_table(state));
414 ldr(rscratch2, Address(rdispatch, rscratch2, Address::uxtw(3)));
415 } else {
416 mov(rscratch2, (address)table);
417 ldr(rscratch2, Address(rscratch2, rscratch1, Address::uxtw(3)));
418 }
419 br(rscratch2);
420
421 if (needs_thread_local_poll) {
422 bind(safepoint);
423 lea(rscratch2, ExternalAddress((address)safepoint_table));
424 ldr(rscratch2, Address(rscratch2, rscratch1, Address::uxtw(3)));
425 br(rscratch2);
426 }
427 }
428
429 void InterpreterMacroAssembler::dispatch_only(TosState state, bool generate_poll) {
430 dispatch_base(state, Interpreter::dispatch_table(state), true, generate_poll);
431 }
432
433 void InterpreterMacroAssembler::dispatch_only_normal(TosState state) {
434 dispatch_base(state, Interpreter::normal_table(state));
435 }
436
437 void InterpreterMacroAssembler::dispatch_only_noverify(TosState state) {
438 dispatch_base(state, Interpreter::normal_table(state), false);
439 }
440
441
442 void InterpreterMacroAssembler::dispatch_next(TosState state, int step, bool generate_poll) {
443 // load next bytecode
444 ldrb(rscratch1, Address(pre(rbcp, step)));
445 dispatch_base(state, Interpreter::dispatch_table(state), /*verifyoop*/true, generate_poll);
446 }
447
448 void InterpreterMacroAssembler::dispatch_via(TosState state, address* table) {
449 // load current bytecode
450 ldrb(rscratch1, Address(rbcp, 0));
451 dispatch_base(state, table);
452 }
453
454 // remove activation
455 //
456 // Apply stack watermark barrier.
457 // Unlock the receiver if this is a synchronized method.
458 // Unlock any Java monitors from synchronized blocks.
459 // Remove the activation from the stack.
460 //
461 // If there are locked Java monitors
462 // If throw_monitor_exception
463 // throws IllegalMonitorStateException
464 // Else if install_monitor_exception
465 // installs IllegalMonitorStateException
466 // Else
467 // no error processing
468 void InterpreterMacroAssembler::remove_activation(
469 TosState state,
470 bool throw_monitor_exception,
471 bool install_monitor_exception,
472 bool notify_jvmdi) {
473 // Note: Registers r3 xmm0 may be in use for the
474 // result check if synchronized method
475 Label unlocked, unlock, no_unlock;
476
477 // The below poll is for the stack watermark barrier. It allows fixing up frames lazily,
478 // that would normally not be safe to use. Such bad returns into unsafe territory of
479 // the stack, will call InterpreterRuntime::at_unwind.
480 Label slow_path;
481 Label fast_path;
482 safepoint_poll(slow_path, true /* at_return */, false /* acquire */, false /* in_nmethod */);
483 br(Assembler::AL, fast_path);
484 bind(slow_path);
485 push(state);
486 set_last_Java_frame(esp, rfp, (address)pc(), rscratch1);
487 super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::at_unwind), rthread);
488 reset_last_Java_frame(true);
489 pop(state);
490 bind(fast_path);
491
492 // get the value of _do_not_unlock_if_synchronized into r3
493 const Address do_not_unlock_if_synchronized(rthread,
494 in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
495 ldrb(r3, do_not_unlock_if_synchronized);
496 strb(zr, do_not_unlock_if_synchronized); // reset the flag
497
498 // get method access flags
499 ldr(r1, Address(rfp, frame::interpreter_frame_method_offset * wordSize));
500 ldr(r2, Address(r1, Method::access_flags_offset()));
501 tbz(r2, exact_log2(JVM_ACC_SYNCHRONIZED), unlocked);
502
503 // Don't unlock anything if the _do_not_unlock_if_synchronized flag
504 // is set.
505 cbnz(r3, no_unlock);
506
507 // unlock monitor
508 push(state); // save result
509
510 // BasicObjectLock will be first in list, since this is a
511 // synchronized method. However, need to check that the object has
512 // not been unlocked by an explicit monitorexit bytecode.
513 const Address monitor(rfp, frame::interpreter_frame_initial_sp_offset *
514 wordSize - (int) sizeof(BasicObjectLock));
515 // We use c_rarg1 so that if we go slow path it will be the correct
516 // register for unlock_object to pass to VM directly
517 lea(c_rarg1, monitor); // address of first monitor
518
519 ldr(r0, Address(c_rarg1, BasicObjectLock::obj_offset()));
520 cbnz(r0, unlock);
521
522 pop(state);
523 if (throw_monitor_exception) {
524 // Entry already unlocked, need to throw exception
525 call_VM(noreg, CAST_FROM_FN_PTR(address,
526 InterpreterRuntime::throw_illegal_monitor_state_exception));
527 should_not_reach_here();
528 } else {
529 // Monitor already unlocked during a stack unroll. If requested,
530 // install an illegal_monitor_state_exception. Continue with
531 // stack unrolling.
532 if (install_monitor_exception) {
533 call_VM(noreg, CAST_FROM_FN_PTR(address,
534 InterpreterRuntime::new_illegal_monitor_state_exception));
535 }
536 b(unlocked);
537 }
538
539 bind(unlock);
540 unlock_object(c_rarg1);
541 pop(state);
542
543 // Check that for block-structured locking (i.e., that all locked
544 // objects has been unlocked)
545 bind(unlocked);
546
547 // r0: Might contain return value
548
549 // Check that all monitors are unlocked
550 {
551 Label loop, exception, entry, restart;
552 const int entry_size = frame::interpreter_frame_monitor_size_in_bytes();
553 const Address monitor_block_top(
554 rfp, frame::interpreter_frame_monitor_block_top_offset * wordSize);
555 const Address monitor_block_bot(
556 rfp, frame::interpreter_frame_initial_sp_offset * wordSize);
557
558 bind(restart);
559 // We use c_rarg1 so that if we go slow path it will be the correct
560 // register for unlock_object to pass to VM directly
561 ldr(c_rarg1, monitor_block_top); // derelativize pointer
562 lea(c_rarg1, Address(rfp, c_rarg1, Address::lsl(Interpreter::logStackElementSize)));
563 // c_rarg1 points to current entry, starting with top-most entry
564
565 lea(r19, monitor_block_bot); // points to word before bottom of
566 // monitor block
567 b(entry);
568
569 // Entry already locked, need to throw exception
570 bind(exception);
571
572 if (throw_monitor_exception) {
573 // Throw exception
574 MacroAssembler::call_VM(noreg,
575 CAST_FROM_FN_PTR(address, InterpreterRuntime::
576 throw_illegal_monitor_state_exception));
577 should_not_reach_here();
578 } else {
579 // Stack unrolling. Unlock object and install illegal_monitor_exception.
580 // Unlock does not block, so don't have to worry about the frame.
581 // We don't have to preserve c_rarg1 since we are going to throw an exception.
582
583 push(state);
584 unlock_object(c_rarg1);
585 pop(state);
586
587 if (install_monitor_exception) {
588 call_VM(noreg, CAST_FROM_FN_PTR(address,
589 InterpreterRuntime::
590 new_illegal_monitor_state_exception));
591 }
592
593 b(restart);
594 }
595
596 bind(loop);
597 // check if current entry is used
598 ldr(rscratch1, Address(c_rarg1, BasicObjectLock::obj_offset()));
599 cbnz(rscratch1, exception);
600
601 add(c_rarg1, c_rarg1, entry_size); // otherwise advance to next entry
602 bind(entry);
603 cmp(c_rarg1, r19); // check if bottom reached
604 br(Assembler::NE, loop); // if not at bottom then check this entry
605 }
606
607 bind(no_unlock);
608
609 // jvmti support
610 if (notify_jvmdi) {
611 notify_method_exit(state, NotifyJVMTI); // preserve TOSCA
612 } else {
613 notify_method_exit(state, SkipNotifyJVMTI); // preserve TOSCA
614 }
615
616 // remove activation
617 // get sender esp
618 ldr(rscratch2,
619 Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize));
620 if (StackReservedPages > 0) {
621 // testing if reserved zone needs to be re-enabled
622 Label no_reserved_zone_enabling;
623
624 // check if already enabled - if so no re-enabling needed
625 assert(sizeof(StackOverflow::StackGuardState) == 4, "unexpected size");
626 ldrw(rscratch1, Address(rthread, JavaThread::stack_guard_state_offset()));
627 cmpw(rscratch1, (u1)StackOverflow::stack_guard_enabled);
628 br(Assembler::EQ, no_reserved_zone_enabling);
629
630 // look for an overflow into the stack reserved zone, i.e.
631 // interpreter_frame_sender_sp <= JavaThread::reserved_stack_activation
632 ldr(rscratch1, Address(rthread, JavaThread::reserved_stack_activation_offset()));
633 cmp(rscratch2, rscratch1);
634 br(Assembler::LS, no_reserved_zone_enabling);
635
636 call_VM_leaf(
637 CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone), rthread);
638 call_VM(noreg, CAST_FROM_FN_PTR(address,
639 InterpreterRuntime::throw_delayed_StackOverflowError));
640 should_not_reach_here();
641
642 bind(no_reserved_zone_enabling);
643 }
644
645 // restore sender esp
646 mov(esp, rscratch2);
647 // remove frame anchor
648 leave();
649 // If we're returning to interpreted code we will shortly be
650 // adjusting SP to allow some space for ESP. If we're returning to
651 // compiled code the saved sender SP was saved in sender_sp, so this
652 // restores it.
653 andr(sp, esp, -16);
654 }
655
656 // Lock object
657 //
658 // Args:
659 // c_rarg1: BasicObjectLock to be used for locking
660 //
661 // Kills:
662 // r0
663 // c_rarg0, c_rarg1, c_rarg2, c_rarg3, c_rarg4, .. (param regs)
664 // rscratch1, rscratch2 (scratch regs)
665 void InterpreterMacroAssembler::lock_object(Register lock_reg)
666 {
667 assert(lock_reg == c_rarg1, "The argument is only for looks. It must be c_rarg1");
668 if (LockingMode == LM_MONITOR) {
669 call_VM(noreg,
670 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter),
671 lock_reg);
672 } else {
673 Label count, done;
674
675 const Register swap_reg = r0;
676 const Register tmp = c_rarg2;
677 const Register obj_reg = c_rarg3; // Will contain the oop
678 const Register tmp2 = c_rarg4;
679 const Register tmp3 = c_rarg5;
680
681 const int obj_offset = in_bytes(BasicObjectLock::obj_offset());
682 const int lock_offset = in_bytes(BasicObjectLock::lock_offset());
683 const int mark_offset = lock_offset +
684 BasicLock::displaced_header_offset_in_bytes();
685
686 Label slow_case;
687
688 // Load object pointer into obj_reg %c_rarg3
689 ldr(obj_reg, Address(lock_reg, obj_offset));
690
691 if (DiagnoseSyncOnValueBasedClasses != 0) {
692 load_klass(tmp, obj_reg);
693 ldrb(tmp, Address(tmp, Klass::misc_flags_offset()));
694 tst(tmp, KlassFlags::_misc_is_value_based_class);
695 br(Assembler::NE, slow_case);
696 }
697
698 if (LockingMode == LM_LIGHTWEIGHT) {
699 lightweight_lock(lock_reg, obj_reg, tmp, tmp2, tmp3, slow_case);
700 b(count);
701 } else if (LockingMode == LM_LEGACY) {
702 // Load (object->mark() | 1) into swap_reg
703 ldr(rscratch1, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
704 orr(swap_reg, rscratch1, 1);
705
706 // Save (object->mark() | 1) into BasicLock's displaced header
707 str(swap_reg, Address(lock_reg, mark_offset));
708
709 assert(lock_offset == 0,
710 "displached header must be first word in BasicObjectLock");
711
712 Label fail;
713 cmpxchg_obj_header(swap_reg, lock_reg, obj_reg, rscratch1, count, /*fallthrough*/nullptr);
714
715 // Fast check for recursive lock.
716 //
717 // Can apply the optimization only if this is a stack lock
718 // allocated in this thread. For efficiency, we can focus on
719 // recently allocated stack locks (instead of reading the stack
720 // base and checking whether 'mark' points inside the current
721 // thread stack):
722 // 1) (mark & 7) == 0, and
723 // 2) sp <= mark < mark + os::pagesize()
724 //
725 // Warning: sp + os::pagesize can overflow the stack base. We must
726 // neither apply the optimization for an inflated lock allocated
727 // just above the thread stack (this is why condition 1 matters)
728 // nor apply the optimization if the stack lock is inside the stack
729 // of another thread. The latter is avoided even in case of overflow
730 // because we have guard pages at the end of all stacks. Hence, if
731 // we go over the stack base and hit the stack of another thread,
732 // this should not be in a writeable area that could contain a
733 // stack lock allocated by that thread. As a consequence, a stack
734 // lock less than page size away from sp is guaranteed to be
735 // owned by the current thread.
736 //
737 // These 3 tests can be done by evaluating the following
738 // expression: ((mark - sp) & (7 - os::vm_page_size())),
739 // assuming both stack pointer and pagesize have their
740 // least significant 3 bits clear.
741 // NOTE: the mark is in swap_reg %r0 as the result of cmpxchg
742 // NOTE2: aarch64 does not like to subtract sp from rn so take a
743 // copy
744 mov(rscratch1, sp);
745 sub(swap_reg, swap_reg, rscratch1);
746 ands(swap_reg, swap_reg, (uint64_t)(7 - (int)os::vm_page_size()));
747
748 // Save the test result, for recursive case, the result is zero
749 str(swap_reg, Address(lock_reg, mark_offset));
750 br(Assembler::EQ, count);
751 }
752 bind(slow_case);
753
754 // Call the runtime routine for slow case
755 call_VM(noreg,
756 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter),
757 lock_reg);
758 b(done);
759
760 bind(count);
761 increment(Address(rthread, JavaThread::held_monitor_count_offset()));
762
763 bind(done);
764 }
765 }
766
767
768 // Unlocks an object. Used in monitorexit bytecode and
769 // remove_activation. Throws an IllegalMonitorException if object is
770 // not locked by current thread.
771 //
772 // Args:
773 // c_rarg1: BasicObjectLock for lock
774 //
775 // Kills:
776 // r0
777 // c_rarg0, c_rarg1, c_rarg2, c_rarg3, ... (param regs)
778 // rscratch1, rscratch2 (scratch regs)
779 void InterpreterMacroAssembler::unlock_object(Register lock_reg)
780 {
781 assert(lock_reg == c_rarg1, "The argument is only for looks. It must be rarg1");
782
783 if (LockingMode == LM_MONITOR) {
784 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), lock_reg);
785 } else {
786 Label count, done;
787
788 const Register swap_reg = r0;
789 const Register header_reg = c_rarg2; // Will contain the old oopMark
790 const Register obj_reg = c_rarg3; // Will contain the oop
791 const Register tmp_reg = c_rarg4; // Temporary used by lightweight_unlock
792
793 save_bcp(); // Save in case of exception
794
795 if (LockingMode != LM_LIGHTWEIGHT) {
796 // Convert from BasicObjectLock structure to object and BasicLock
797 // structure Store the BasicLock address into %r0
798 lea(swap_reg, Address(lock_reg, BasicObjectLock::lock_offset()));
799 }
800
801 // Load oop into obj_reg(%c_rarg3)
802 ldr(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset()));
803
804 // Free entry
805 str(zr, Address(lock_reg, BasicObjectLock::obj_offset()));
806
807 if (LockingMode == LM_LIGHTWEIGHT) {
808 Label slow_case;
809 lightweight_unlock(obj_reg, header_reg, swap_reg, tmp_reg, slow_case);
810 b(count);
811 bind(slow_case);
812 } else if (LockingMode == LM_LEGACY) {
813 // Load the old header from BasicLock structure
814 ldr(header_reg, Address(swap_reg,
815 BasicLock::displaced_header_offset_in_bytes()));
816
817 // Test for recursion
818 cbz(header_reg, count);
819
820 // Atomic swap back the old header
821 cmpxchg_obj_header(swap_reg, header_reg, obj_reg, rscratch1, count, /*fallthrough*/nullptr);
822 }
823 // Call the runtime routine for slow case.
824 str(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset())); // restore obj
825 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), lock_reg);
826 b(done);
827
828 bind(count);
829 decrement(Address(rthread, JavaThread::held_monitor_count_offset()));
830
831 bind(done);
832 restore_bcp();
833 }
834 }
835
836 void InterpreterMacroAssembler::test_method_data_pointer(Register mdp,
837 Label& zero_continue) {
838 assert(ProfileInterpreter, "must be profiling interpreter");
839 ldr(mdp, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
840 cbz(mdp, zero_continue);
841 }
842
843 // Set the method data pointer for the current bcp.
844 void InterpreterMacroAssembler::set_method_data_pointer_for_bcp() {
845 assert(ProfileInterpreter, "must be profiling interpreter");
846 Label set_mdp;
847 stp(r0, r1, Address(pre(sp, -2 * wordSize)));
848
849 // Test MDO to avoid the call if it is null.
850 ldr(r0, Address(rmethod, in_bytes(Method::method_data_offset())));
851 cbz(r0, set_mdp);
852 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), rmethod, rbcp);
853 // r0: mdi
854 // mdo is guaranteed to be non-zero here, we checked for it before the call.
855 ldr(r1, Address(rmethod, in_bytes(Method::method_data_offset())));
856 lea(r1, Address(r1, in_bytes(MethodData::data_offset())));
857 add(r0, r1, r0);
858 str(r0, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
859 bind(set_mdp);
860 ldp(r0, r1, Address(post(sp, 2 * wordSize)));
861 }
862
863 void InterpreterMacroAssembler::verify_method_data_pointer() {
864 assert(ProfileInterpreter, "must be profiling interpreter");
865 #ifdef ASSERT
866 Label verify_continue;
867 stp(r0, r1, Address(pre(sp, -2 * wordSize)));
868 stp(r2, r3, Address(pre(sp, -2 * wordSize)));
869 test_method_data_pointer(r3, verify_continue); // If mdp is zero, continue
870 get_method(r1);
871
872 // If the mdp is valid, it will point to a DataLayout header which is
873 // consistent with the bcp. The converse is highly probable also.
874 ldrsh(r2, Address(r3, in_bytes(DataLayout::bci_offset())));
875 ldr(rscratch1, Address(r1, Method::const_offset()));
876 add(r2, r2, rscratch1, Assembler::LSL);
877 lea(r2, Address(r2, ConstMethod::codes_offset()));
878 cmp(r2, rbcp);
879 br(Assembler::EQ, verify_continue);
880 // r1: method
881 // rbcp: bcp // rbcp == 22
882 // r3: mdp
883 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp),
884 r1, rbcp, r3);
885 bind(verify_continue);
886 ldp(r2, r3, Address(post(sp, 2 * wordSize)));
887 ldp(r0, r1, Address(post(sp, 2 * wordSize)));
888 #endif // ASSERT
889 }
890
891
892 void InterpreterMacroAssembler::set_mdp_data_at(Register mdp_in,
893 int constant,
894 Register value) {
895 assert(ProfileInterpreter, "must be profiling interpreter");
896 Address data(mdp_in, constant);
897 str(value, data);
898 }
899
900
901 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in,
902 int constant,
903 bool decrement) {
904 increment_mdp_data_at(mdp_in, noreg, constant, decrement);
905 }
906
907 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in,
908 Register reg,
909 int constant,
910 bool decrement) {
911 assert(ProfileInterpreter, "must be profiling interpreter");
912 // %%% this does 64bit counters at best it is wasting space
913 // at worst it is a rare bug when counters overflow
914
915 assert_different_registers(rscratch2, rscratch1, mdp_in, reg);
916
917 Address addr1(mdp_in, constant);
918 Address addr2(rscratch2, reg, Address::lsl(0));
919 Address &addr = addr1;
920 if (reg != noreg) {
921 lea(rscratch2, addr1);
922 addr = addr2;
923 }
924
925 if (decrement) {
926 // Decrement the register. Set condition codes.
927 // Intel does this
928 // addptr(data, (int32_t) -DataLayout::counter_increment);
929 // If the decrement causes the counter to overflow, stay negative
930 // Label L;
931 // jcc(Assembler::negative, L);
932 // addptr(data, (int32_t) DataLayout::counter_increment);
933 // so we do this
934 ldr(rscratch1, addr);
935 subs(rscratch1, rscratch1, (unsigned)DataLayout::counter_increment);
936 Label L;
937 br(Assembler::LO, L); // skip store if counter underflow
938 str(rscratch1, addr);
939 bind(L);
940 } else {
941 assert(DataLayout::counter_increment == 1,
942 "flow-free idiom only works with 1");
943 // Intel does this
944 // Increment the register. Set carry flag.
945 // addptr(data, DataLayout::counter_increment);
946 // If the increment causes the counter to overflow, pull back by 1.
947 // sbbptr(data, (int32_t)0);
948 // so we do this
949 ldr(rscratch1, addr);
950 adds(rscratch1, rscratch1, DataLayout::counter_increment);
951 Label L;
952 br(Assembler::CS, L); // skip store if counter overflow
953 str(rscratch1, addr);
954 bind(L);
955 }
956 }
957
958 void InterpreterMacroAssembler::set_mdp_flag_at(Register mdp_in,
959 int flag_byte_constant) {
960 assert(ProfileInterpreter, "must be profiling interpreter");
961 int flags_offset = in_bytes(DataLayout::flags_offset());
962 // Set the flag
963 ldrb(rscratch1, Address(mdp_in, flags_offset));
964 orr(rscratch1, rscratch1, flag_byte_constant);
965 strb(rscratch1, Address(mdp_in, flags_offset));
966 }
967
968
969 void InterpreterMacroAssembler::test_mdp_data_at(Register mdp_in,
970 int offset,
971 Register value,
972 Register test_value_out,
973 Label& not_equal_continue) {
974 assert(ProfileInterpreter, "must be profiling interpreter");
975 if (test_value_out == noreg) {
976 ldr(rscratch1, Address(mdp_in, offset));
977 cmp(value, rscratch1);
978 } else {
979 // Put the test value into a register, so caller can use it:
980 ldr(test_value_out, Address(mdp_in, offset));
981 cmp(value, test_value_out);
982 }
983 br(Assembler::NE, not_equal_continue);
984 }
985
986
987 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in,
988 int offset_of_disp) {
989 assert(ProfileInterpreter, "must be profiling interpreter");
990 ldr(rscratch1, Address(mdp_in, offset_of_disp));
991 add(mdp_in, mdp_in, rscratch1, LSL);
992 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
993 }
994
995
996 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in,
997 Register reg,
998 int offset_of_disp) {
999 assert(ProfileInterpreter, "must be profiling interpreter");
1000 lea(rscratch1, Address(mdp_in, offset_of_disp));
1001 ldr(rscratch1, Address(rscratch1, reg, Address::lsl(0)));
1002 add(mdp_in, mdp_in, rscratch1, LSL);
1003 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
1004 }
1005
1006
1007 void InterpreterMacroAssembler::update_mdp_by_constant(Register mdp_in,
1008 int constant) {
1009 assert(ProfileInterpreter, "must be profiling interpreter");
1010 add(mdp_in, mdp_in, (unsigned)constant);
1011 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
1012 }
1013
1014
1015 void InterpreterMacroAssembler::update_mdp_for_ret(Register return_bci) {
1016 assert(ProfileInterpreter, "must be profiling interpreter");
1017 // save/restore across call_VM
1018 stp(zr, return_bci, Address(pre(sp, -2 * wordSize)));
1019 call_VM(noreg,
1020 CAST_FROM_FN_PTR(address, InterpreterRuntime::update_mdp_for_ret),
1021 return_bci);
1022 ldp(zr, return_bci, Address(post(sp, 2 * wordSize)));
1023 }
1024
1025
1026 void InterpreterMacroAssembler::profile_taken_branch(Register mdp,
1027 Register bumped_count) {
1028 if (ProfileInterpreter) {
1029 Label profile_continue;
1030
1031 // If no method data exists, go to profile_continue.
1032 // Otherwise, assign to mdp
1033 test_method_data_pointer(mdp, profile_continue);
1034
1035 // We are taking a branch. Increment the taken count.
1036 // We inline increment_mdp_data_at to return bumped_count in a register
1037 //increment_mdp_data_at(mdp, in_bytes(JumpData::taken_offset()));
1038 Address data(mdp, in_bytes(JumpData::taken_offset()));
1039 ldr(bumped_count, data);
1040 assert(DataLayout::counter_increment == 1,
1041 "flow-free idiom only works with 1");
1042 // Intel does this to catch overflow
1043 // addptr(bumped_count, DataLayout::counter_increment);
1044 // sbbptr(bumped_count, 0);
1045 // so we do this
1046 adds(bumped_count, bumped_count, DataLayout::counter_increment);
1047 Label L;
1048 br(Assembler::CS, L); // skip store if counter overflow
1049 str(bumped_count, data);
1050 bind(L);
1051 // The method data pointer needs to be updated to reflect the new target.
1052 update_mdp_by_offset(mdp, in_bytes(JumpData::displacement_offset()));
1053 bind(profile_continue);
1054 }
1055 }
1056
1057
1058 void InterpreterMacroAssembler::profile_not_taken_branch(Register mdp) {
1059 if (ProfileInterpreter) {
1060 Label profile_continue;
1061
1062 // If no method data exists, go to profile_continue.
1063 test_method_data_pointer(mdp, profile_continue);
1064
1065 // We are taking a branch. Increment the not taken count.
1066 increment_mdp_data_at(mdp, in_bytes(BranchData::not_taken_offset()));
1067
1068 // The method data pointer needs to be updated to correspond to
1069 // the next bytecode
1070 update_mdp_by_constant(mdp, in_bytes(BranchData::branch_data_size()));
1071 bind(profile_continue);
1072 }
1073 }
1074
1075
1076 void InterpreterMacroAssembler::profile_call(Register mdp) {
1077 if (ProfileInterpreter) {
1078 Label profile_continue;
1079
1080 // If no method data exists, go to profile_continue.
1081 test_method_data_pointer(mdp, profile_continue);
1082
1083 // We are making a call. Increment the count.
1084 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1085
1086 // The method data pointer needs to be updated to reflect the new target.
1087 update_mdp_by_constant(mdp, in_bytes(CounterData::counter_data_size()));
1088 bind(profile_continue);
1089 }
1090 }
1091
1092 void InterpreterMacroAssembler::profile_final_call(Register mdp) {
1093 if (ProfileInterpreter) {
1094 Label profile_continue;
1095
1096 // If no method data exists, go to profile_continue.
1097 test_method_data_pointer(mdp, profile_continue);
1098
1099 // We are making a call. Increment the count.
1100 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1101
1102 // The method data pointer needs to be updated to reflect the new target.
1103 update_mdp_by_constant(mdp,
1104 in_bytes(VirtualCallData::
1105 virtual_call_data_size()));
1106 bind(profile_continue);
1107 }
1108 }
1109
1110
1111 void InterpreterMacroAssembler::profile_virtual_call(Register receiver,
1112 Register mdp,
1113 Register reg2,
1114 bool receiver_can_be_null) {
1115 if (ProfileInterpreter) {
1116 Label profile_continue;
1117
1118 // If no method data exists, go to profile_continue.
1119 test_method_data_pointer(mdp, profile_continue);
1120
1121 Label skip_receiver_profile;
1122 if (receiver_can_be_null) {
1123 Label not_null;
1124 // We are making a call. Increment the count for null receiver.
1125 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1126 b(skip_receiver_profile);
1127 bind(not_null);
1128 }
1129
1130 // Record the receiver type.
1131 record_klass_in_profile(receiver, mdp, reg2);
1132 bind(skip_receiver_profile);
1133
1134 // The method data pointer needs to be updated to reflect the new target.
1135 update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size()));
1136 bind(profile_continue);
1137 }
1138 }
1139
1140 // This routine creates a state machine for updating the multi-row
1141 // type profile at a virtual call site (or other type-sensitive bytecode).
1142 // The machine visits each row (of receiver/count) until the receiver type
1143 // is found, or until it runs out of rows. At the same time, it remembers
1144 // the location of the first empty row. (An empty row records null for its
1145 // receiver, and can be allocated for a newly-observed receiver type.)
1146 // Because there are two degrees of freedom in the state, a simple linear
1147 // search will not work; it must be a decision tree. Hence this helper
1148 // function is recursive, to generate the required tree structured code.
1149 // It's the interpreter, so we are trading off code space for speed.
1150 // See below for example code.
1151 void InterpreterMacroAssembler::record_klass_in_profile_helper(
1152 Register receiver, Register mdp,
1153 Register reg2, int start_row,
1154 Label& done) {
1155 if (TypeProfileWidth == 0) {
1156 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1157 } else {
1158 record_item_in_profile_helper(receiver, mdp, reg2, 0, done, TypeProfileWidth,
1159 &VirtualCallData::receiver_offset, &VirtualCallData::receiver_count_offset);
1160 }
1161 }
1162
1163 void InterpreterMacroAssembler::record_item_in_profile_helper(Register item, Register mdp,
1164 Register reg2, int start_row, Label& done, int total_rows,
1165 OffsetFunction item_offset_fn, OffsetFunction item_count_offset_fn) {
1166 int last_row = total_rows - 1;
1167 assert(start_row <= last_row, "must be work left to do");
1168 // Test this row for both the item and for null.
1169 // Take any of three different outcomes:
1170 // 1. found item => increment count and goto done
1171 // 2. found null => keep looking for case 1, maybe allocate this cell
1172 // 3. found something else => keep looking for cases 1 and 2
1173 // Case 3 is handled by a recursive call.
1174 for (int row = start_row; row <= last_row; row++) {
1175 Label next_test;
1176 bool test_for_null_also = (row == start_row);
1177
1178 // See if the item is item[n].
1179 int item_offset = in_bytes(item_offset_fn(row));
1180 test_mdp_data_at(mdp, item_offset, item,
1181 (test_for_null_also ? reg2 : noreg),
1182 next_test);
1183 // (Reg2 now contains the item from the CallData.)
1184
1185 // The item is item[n]. Increment count[n].
1186 int count_offset = in_bytes(item_count_offset_fn(row));
1187 increment_mdp_data_at(mdp, count_offset);
1188 b(done);
1189 bind(next_test);
1190
1191 if (test_for_null_also) {
1192 Label found_null;
1193 // Failed the equality check on item[n]... Test for null.
1194 if (start_row == last_row) {
1195 // The only thing left to do is handle the null case.
1196 cbz(reg2, found_null);
1197 // Item did not match any saved item and there is no empty row for it.
1198 // Increment total counter to indicate polymorphic case.
1199 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1200 b(done);
1201 bind(found_null);
1202 break;
1203 }
1204 // Since null is rare, make it be the branch-taken case.
1205 cbz(reg2, found_null);
1206
1207 // Put all the "Case 3" tests here.
1208 record_item_in_profile_helper(item, mdp, reg2, start_row + 1, done, total_rows,
1209 item_offset_fn, item_count_offset_fn);
1210
1211 // Found a null. Keep searching for a matching item,
1212 // but remember that this is an empty (unused) slot.
1213 bind(found_null);
1214 }
1215 }
1216
1217 // In the fall-through case, we found no matching item, but we
1218 // observed the item[start_row] is null.
1219
1220 // Fill in the item field and increment the count.
1221 int item_offset = in_bytes(item_offset_fn(start_row));
1222 set_mdp_data_at(mdp, item_offset, item);
1223 int count_offset = in_bytes(item_count_offset_fn(start_row));
1224 mov(reg2, DataLayout::counter_increment);
1225 set_mdp_data_at(mdp, count_offset, reg2);
1226 if (start_row > 0) {
1227 b(done);
1228 }
1229 }
1230
1231 // Example state machine code for three profile rows:
1232 // // main copy of decision tree, rooted at row[1]
1233 // if (row[0].rec == rec) { row[0].incr(); goto done; }
1234 // if (row[0].rec != nullptr) {
1235 // // inner copy of decision tree, rooted at row[1]
1236 // if (row[1].rec == rec) { row[1].incr(); goto done; }
1237 // if (row[1].rec != nullptr) {
1238 // // degenerate decision tree, rooted at row[2]
1239 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1240 // if (row[2].rec != nullptr) { count.incr(); goto done; } // overflow
1241 // row[2].init(rec); goto done;
1242 // } else {
1243 // // remember row[1] is empty
1244 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1245 // row[1].init(rec); goto done;
1246 // }
1247 // } else {
1248 // // remember row[0] is empty
1249 // if (row[1].rec == rec) { row[1].incr(); goto done; }
1250 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1251 // row[0].init(rec); goto done;
1252 // }
1253 // done:
1254
1255 void InterpreterMacroAssembler::record_klass_in_profile(Register receiver,
1256 Register mdp, Register reg2) {
1257 assert(ProfileInterpreter, "must be profiling");
1258 Label done;
1259
1260 record_klass_in_profile_helper(receiver, mdp, reg2, 0, done);
1261
1262 bind (done);
1263 }
1264
1265 void InterpreterMacroAssembler::profile_ret(Register return_bci,
1266 Register mdp) {
1267 if (ProfileInterpreter) {
1268 Label profile_continue;
1269 uint row;
1270
1271 // If no method data exists, go to profile_continue.
1272 test_method_data_pointer(mdp, profile_continue);
1273
1274 // Update the total ret count.
1275 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1276
1277 for (row = 0; row < RetData::row_limit(); row++) {
1278 Label next_test;
1279
1280 // See if return_bci is equal to bci[n]:
1281 test_mdp_data_at(mdp,
1282 in_bytes(RetData::bci_offset(row)),
1283 return_bci, noreg,
1284 next_test);
1285
1286 // return_bci is equal to bci[n]. Increment the count.
1287 increment_mdp_data_at(mdp, in_bytes(RetData::bci_count_offset(row)));
1288
1289 // The method data pointer needs to be updated to reflect the new target.
1290 update_mdp_by_offset(mdp,
1291 in_bytes(RetData::bci_displacement_offset(row)));
1292 b(profile_continue);
1293 bind(next_test);
1294 }
1295
1296 update_mdp_for_ret(return_bci);
1297
1298 bind(profile_continue);
1299 }
1300 }
1301
1302 void InterpreterMacroAssembler::profile_null_seen(Register mdp) {
1303 if (ProfileInterpreter) {
1304 Label profile_continue;
1305
1306 // If no method data exists, go to profile_continue.
1307 test_method_data_pointer(mdp, profile_continue);
1308
1309 set_mdp_flag_at(mdp, BitData::null_seen_byte_constant());
1310
1311 // The method data pointer needs to be updated.
1312 int mdp_delta = in_bytes(BitData::bit_data_size());
1313 if (TypeProfileCasts) {
1314 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());
1315 }
1316 update_mdp_by_constant(mdp, mdp_delta);
1317
1318 bind(profile_continue);
1319 }
1320 }
1321
1322 void InterpreterMacroAssembler::profile_typecheck(Register mdp, Register klass, Register reg2) {
1323 if (ProfileInterpreter) {
1324 Label profile_continue;
1325
1326 // If no method data exists, go to profile_continue.
1327 test_method_data_pointer(mdp, profile_continue);
1328
1329 // The method data pointer needs to be updated.
1330 int mdp_delta = in_bytes(BitData::bit_data_size());
1331 if (TypeProfileCasts) {
1332 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());
1333
1334 // Record the object type.
1335 record_klass_in_profile(klass, mdp, reg2);
1336 }
1337 update_mdp_by_constant(mdp, mdp_delta);
1338
1339 bind(profile_continue);
1340 }
1341 }
1342
1343 void InterpreterMacroAssembler::profile_switch_default(Register mdp) {
1344 if (ProfileInterpreter) {
1345 Label profile_continue;
1346
1347 // If no method data exists, go to profile_continue.
1348 test_method_data_pointer(mdp, profile_continue);
1349
1350 // Update the default case count
1351 increment_mdp_data_at(mdp,
1352 in_bytes(MultiBranchData::default_count_offset()));
1353
1354 // The method data pointer needs to be updated.
1355 update_mdp_by_offset(mdp,
1356 in_bytes(MultiBranchData::
1357 default_displacement_offset()));
1358
1359 bind(profile_continue);
1360 }
1361 }
1362
1363 void InterpreterMacroAssembler::profile_switch_case(Register index,
1364 Register mdp,
1365 Register reg2) {
1366 if (ProfileInterpreter) {
1367 Label profile_continue;
1368
1369 // If no method data exists, go to profile_continue.
1370 test_method_data_pointer(mdp, profile_continue);
1371
1372 // Build the base (index * per_case_size_in_bytes()) +
1373 // case_array_offset_in_bytes()
1374 movw(reg2, in_bytes(MultiBranchData::per_case_size()));
1375 movw(rscratch1, in_bytes(MultiBranchData::case_array_offset()));
1376 Assembler::maddw(index, index, reg2, rscratch1);
1377
1378 // Update the case count
1379 increment_mdp_data_at(mdp,
1380 index,
1381 in_bytes(MultiBranchData::relative_count_offset()));
1382
1383 // The method data pointer needs to be updated.
1384 update_mdp_by_offset(mdp,
1385 index,
1386 in_bytes(MultiBranchData::
1387 relative_displacement_offset()));
1388
1389 bind(profile_continue);
1390 }
1391 }
1392
1393 void InterpreterMacroAssembler::_interp_verify_oop(Register reg, TosState state, const char* file, int line) {
1394 if (state == atos) {
1395 MacroAssembler::_verify_oop_checked(reg, "broken oop", file, line);
1396 }
1397 }
1398
1399 void InterpreterMacroAssembler::verify_FPU(int stack_depth, TosState state) { ; }
1400
1401
1402 void InterpreterMacroAssembler::notify_method_entry() {
1403 // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to
1404 // track stack depth. If it is possible to enter interp_only_mode we add
1405 // the code to check if the event should be sent.
1406 if (JvmtiExport::can_post_interpreter_events()) {
1407 Label L;
1408 ldrw(r3, Address(rthread, JavaThread::interp_only_mode_offset()));
1409 cbzw(r3, L);
1410 call_VM(noreg, CAST_FROM_FN_PTR(address,
1411 InterpreterRuntime::post_method_entry));
1412 bind(L);
1413 }
1414
1415 if (DTraceMethodProbes) {
1416 get_method(c_rarg1);
1417 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry),
1418 rthread, c_rarg1);
1419 }
1420
1421 // RedefineClasses() tracing support for obsolete method entry
1422 if (log_is_enabled(Trace, redefine, class, obsolete) ||
1423 log_is_enabled(Trace, interpreter, bytecode)) {
1424 get_method(c_rarg1);
1425 call_VM_leaf(
1426 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry),
1427 rthread, c_rarg1);
1428 }
1429
1430 }
1431
1432
1433 void InterpreterMacroAssembler::notify_method_exit(
1434 TosState state, NotifyMethodExitMode mode) {
1435 // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to
1436 // track stack depth. If it is possible to enter interp_only_mode we add
1437 // the code to check if the event should be sent.
1438 if (mode == NotifyJVMTI && JvmtiExport::can_post_interpreter_events()) {
1439 Label L;
1440 // Note: frame::interpreter_frame_result has a dependency on how the
1441 // method result is saved across the call to post_method_exit. If this
1442 // is changed then the interpreter_frame_result implementation will
1443 // need to be updated too.
1444
1445 // template interpreter will leave the result on the top of the stack.
1446 push(state);
1447 ldrw(r3, Address(rthread, JavaThread::interp_only_mode_offset()));
1448 cbz(r3, L);
1449 call_VM(noreg,
1450 CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit));
1451 bind(L);
1452 pop(state);
1453 }
1454
1455 if (DTraceMethodProbes) {
1456 push(state);
1457 get_method(c_rarg1);
1458 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),
1459 rthread, c_rarg1);
1460 pop(state);
1461 }
1462 }
1463
1464
1465 // Jump if ((*counter_addr += increment) & mask) satisfies the condition.
1466 void InterpreterMacroAssembler::increment_mask_and_jump(Address counter_addr,
1467 int increment, Address mask,
1468 Register scratch, Register scratch2,
1469 bool preloaded, Condition cond,
1470 Label* where) {
1471 if (!preloaded) {
1472 ldrw(scratch, counter_addr);
1473 }
1474 add(scratch, scratch, increment);
1475 strw(scratch, counter_addr);
1476 ldrw(scratch2, mask);
1477 ands(scratch, scratch, scratch2);
1478 br(cond, *where);
1479 }
1480
1481 void InterpreterMacroAssembler::call_VM_leaf_base(address entry_point,
1482 int number_of_arguments) {
1483 // interpreter specific
1484 //
1485 // Note: No need to save/restore rbcp & rlocals pointer since these
1486 // are callee saved registers and no blocking/ GC can happen
1487 // in leaf calls.
1488 #ifdef ASSERT
1489 {
1490 Label L;
1491 ldr(rscratch1, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
1492 cbz(rscratch1, L);
1493 stop("InterpreterMacroAssembler::call_VM_leaf_base:"
1494 " last_sp != nullptr");
1495 bind(L);
1496 }
1497 #endif /* ASSERT */
1498 // super call
1499 MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments);
1500 }
1501
1502 void InterpreterMacroAssembler::call_VM_base(Register oop_result,
1503 Register java_thread,
1504 Register last_java_sp,
1505 address entry_point,
1506 int number_of_arguments,
1507 bool check_exceptions) {
1508 // interpreter specific
1509 //
1510 // Note: Could avoid restoring locals ptr (callee saved) - however doesn't
1511 // really make a difference for these runtime calls, since they are
1512 // slow anyway. Btw., bcp must be saved/restored since it may change
1513 // due to GC.
1514 // assert(java_thread == noreg , "not expecting a precomputed java thread");
1515 save_bcp();
1516 #ifdef ASSERT
1517 {
1518 Label L;
1519 ldr(rscratch1, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
1520 cbz(rscratch1, L);
1521 stop("InterpreterMacroAssembler::call_VM_base:"
1522 " last_sp != nullptr");
1523 bind(L);
1524 }
1525 #endif /* ASSERT */
1526 // super call
1527 MacroAssembler::call_VM_base(oop_result, noreg, last_java_sp,
1528 entry_point, number_of_arguments,
1529 check_exceptions);
1530 // interpreter specific
1531 restore_bcp();
1532 restore_locals();
1533 }
1534
1535 void InterpreterMacroAssembler::profile_obj_type(Register obj, const Address& mdo_addr) {
1536 assert_different_registers(obj, rscratch1, mdo_addr.base(), mdo_addr.index());
1537 Label update, next, none;
1538
1539 verify_oop(obj);
1540
1541 cbnz(obj, update);
1542 orptr(mdo_addr, TypeEntries::null_seen);
1543 b(next);
1544
1545 bind(update);
1546 load_klass(obj, obj);
1547
1548 ldr(rscratch1, mdo_addr);
1549 eor(obj, obj, rscratch1);
1550 tst(obj, TypeEntries::type_klass_mask);
1551 br(Assembler::EQ, next); // klass seen before, nothing to
1552 // do. The unknown bit may have been
1553 // set already but no need to check.
1554
1555 tbnz(obj, exact_log2(TypeEntries::type_unknown), next);
1556 // already unknown. Nothing to do anymore.
1557
1558 cbz(rscratch1, none);
1559 cmp(rscratch1, (u1)TypeEntries::null_seen);
1560 br(Assembler::EQ, none);
1561 // There is a chance that the checks above
1562 // fail if another thread has just set the
1563 // profiling to this obj's klass
1564 eor(obj, obj, rscratch1); // get back original value before XOR
1565 ldr(rscratch1, mdo_addr);
1566 eor(obj, obj, rscratch1);
1567 tst(obj, TypeEntries::type_klass_mask);
1568 br(Assembler::EQ, next);
1569
1570 // different than before. Cannot keep accurate profile.
1571 orptr(mdo_addr, TypeEntries::type_unknown);
1572 b(next);
1573
1574 bind(none);
1575 // first time here. Set profile type.
1576 str(obj, mdo_addr);
1577 #ifdef ASSERT
1578 andr(obj, obj, TypeEntries::type_mask);
1579 verify_klass_ptr(obj);
1580 #endif
1581
1582 bind(next);
1583 }
1584
1585 void InterpreterMacroAssembler::profile_arguments_type(Register mdp, Register callee, Register tmp, bool is_virtual) {
1586 if (!ProfileInterpreter) {
1587 return;
1588 }
1589
1590 if (MethodData::profile_arguments() || MethodData::profile_return()) {
1591 Label profile_continue;
1592
1593 test_method_data_pointer(mdp, profile_continue);
1594
1595 int off_to_start = is_virtual ? in_bytes(VirtualCallData::virtual_call_data_size()) : in_bytes(CounterData::counter_data_size());
1596
1597 ldrb(rscratch1, Address(mdp, in_bytes(DataLayout::tag_offset()) - off_to_start));
1598 cmp(rscratch1, u1(is_virtual ? DataLayout::virtual_call_type_data_tag : DataLayout::call_type_data_tag));
1599 br(Assembler::NE, profile_continue);
1600
1601 if (MethodData::profile_arguments()) {
1602 Label done;
1603 int off_to_args = in_bytes(TypeEntriesAtCall::args_data_offset());
1604
1605 for (int i = 0; i < TypeProfileArgsLimit; i++) {
1606 if (i > 0 || MethodData::profile_return()) {
1607 // If return value type is profiled we may have no argument to profile
1608 ldr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset())));
1609 sub(tmp, tmp, i*TypeStackSlotEntries::per_arg_count());
1610 cmp(tmp, (u1)TypeStackSlotEntries::per_arg_count());
1611 add(rscratch1, mdp, off_to_args);
1612 br(Assembler::LT, done);
1613 }
1614 ldr(tmp, Address(callee, Method::const_offset()));
1615 load_unsigned_short(tmp, Address(tmp, ConstMethod::size_of_parameters_offset()));
1616 // stack offset o (zero based) from the start of the argument
1617 // list, for n arguments translates into offset n - o - 1 from
1618 // the end of the argument list
1619 ldr(rscratch1, Address(mdp, in_bytes(TypeEntriesAtCall::stack_slot_offset(i))));
1620 sub(tmp, tmp, rscratch1);
1621 sub(tmp, tmp, 1);
1622 Address arg_addr = argument_address(tmp);
1623 ldr(tmp, arg_addr);
1624
1625 Address mdo_arg_addr(mdp, in_bytes(TypeEntriesAtCall::argument_type_offset(i)));
1626 profile_obj_type(tmp, mdo_arg_addr);
1627
1628 int to_add = in_bytes(TypeStackSlotEntries::per_arg_size());
1629 off_to_args += to_add;
1630 }
1631
1632 if (MethodData::profile_return()) {
1633 ldr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset())));
1634 sub(tmp, tmp, TypeProfileArgsLimit*TypeStackSlotEntries::per_arg_count());
1635 }
1636
1637 add(rscratch1, mdp, off_to_args);
1638 bind(done);
1639 mov(mdp, rscratch1);
1640
1641 if (MethodData::profile_return()) {
1642 // We're right after the type profile for the last
1643 // argument. tmp is the number of cells left in the
1644 // CallTypeData/VirtualCallTypeData to reach its end. Non null
1645 // if there's a return to profile.
1646 assert(ReturnTypeEntry::static_cell_count() < TypeStackSlotEntries::per_arg_count(), "can't move past ret type");
1647 add(mdp, mdp, tmp, LSL, exact_log2(DataLayout::cell_size));
1648 }
1649 str(mdp, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
1650 } else {
1651 assert(MethodData::profile_return(), "either profile call args or call ret");
1652 update_mdp_by_constant(mdp, in_bytes(TypeEntriesAtCall::return_only_size()));
1653 }
1654
1655 // mdp points right after the end of the
1656 // CallTypeData/VirtualCallTypeData, right after the cells for the
1657 // return value type if there's one
1658
1659 bind(profile_continue);
1660 }
1661 }
1662
1663 void InterpreterMacroAssembler::profile_return_type(Register mdp, Register ret, Register tmp) {
1664 assert_different_registers(mdp, ret, tmp, rbcp);
1665 if (ProfileInterpreter && MethodData::profile_return()) {
1666 Label profile_continue, done;
1667
1668 test_method_data_pointer(mdp, profile_continue);
1669
1670 if (MethodData::profile_return_jsr292_only()) {
1671 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
1672
1673 // If we don't profile all invoke bytecodes we must make sure
1674 // it's a bytecode we indeed profile. We can't go back to the
1675 // beginning of the ProfileData we intend to update to check its
1676 // type because we're right after it and we don't known its
1677 // length
1678 Label do_profile;
1679 ldrb(rscratch1, Address(rbcp, 0));
1680 cmp(rscratch1, (u1)Bytecodes::_invokedynamic);
1681 br(Assembler::EQ, do_profile);
1682 cmp(rscratch1, (u1)Bytecodes::_invokehandle);
1683 br(Assembler::EQ, do_profile);
1684 get_method(tmp);
1685 ldrh(rscratch1, Address(tmp, Method::intrinsic_id_offset()));
1686 subs(zr, rscratch1, static_cast<int>(vmIntrinsics::_compiledLambdaForm));
1687 br(Assembler::NE, profile_continue);
1688
1689 bind(do_profile);
1690 }
1691
1692 Address mdo_ret_addr(mdp, -in_bytes(ReturnTypeEntry::size()));
1693 mov(tmp, ret);
1694 profile_obj_type(tmp, mdo_ret_addr);
1695
1696 bind(profile_continue);
1697 }
1698 }
1699
1700 void InterpreterMacroAssembler::profile_parameters_type(Register mdp, Register tmp1, Register tmp2) {
1701 assert_different_registers(rscratch1, rscratch2, mdp, tmp1, tmp2);
1702 if (ProfileInterpreter && MethodData::profile_parameters()) {
1703 Label profile_continue, done;
1704
1705 test_method_data_pointer(mdp, profile_continue);
1706
1707 // Load the offset of the area within the MDO used for
1708 // parameters. If it's negative we're not profiling any parameters
1709 ldrw(tmp1, Address(mdp, in_bytes(MethodData::parameters_type_data_di_offset()) - in_bytes(MethodData::data_offset())));
1710 tbnz(tmp1, 31, profile_continue); // i.e. sign bit set
1711
1712 // Compute a pointer to the area for parameters from the offset
1713 // and move the pointer to the slot for the last
1714 // parameters. Collect profiling from last parameter down.
1715 // mdo start + parameters offset + array length - 1
1716 add(mdp, mdp, tmp1);
1717 ldr(tmp1, Address(mdp, ArrayData::array_len_offset()));
1718 sub(tmp1, tmp1, TypeStackSlotEntries::per_arg_count());
1719
1720 Label loop;
1721 bind(loop);
1722
1723 int off_base = in_bytes(ParametersTypeData::stack_slot_offset(0));
1724 int type_base = in_bytes(ParametersTypeData::type_offset(0));
1725 int per_arg_scale = exact_log2(DataLayout::cell_size);
1726 add(rscratch1, mdp, off_base);
1727 add(rscratch2, mdp, type_base);
1728
1729 Address arg_off(rscratch1, tmp1, Address::lsl(per_arg_scale));
1730 Address arg_type(rscratch2, tmp1, Address::lsl(per_arg_scale));
1731
1732 // load offset on the stack from the slot for this parameter
1733 ldr(tmp2, arg_off);
1734 neg(tmp2, tmp2);
1735 // read the parameter from the local area
1736 ldr(tmp2, Address(rlocals, tmp2, Address::lsl(Interpreter::logStackElementSize)));
1737
1738 // profile the parameter
1739 profile_obj_type(tmp2, arg_type);
1740
1741 // go to next parameter
1742 subs(tmp1, tmp1, TypeStackSlotEntries::per_arg_count());
1743 br(Assembler::GE, loop);
1744
1745 bind(profile_continue);
1746 }
1747 }
1748
1749 void InterpreterMacroAssembler::load_resolved_indy_entry(Register cache, Register index) {
1750 // Get index out of bytecode pointer, get_cache_entry_pointer_at_bcp
1751 get_cache_index_at_bcp(index, 1, sizeof(u4));
1752 // Get address of invokedynamic array
1753 ldr(cache, Address(rcpool, in_bytes(ConstantPoolCache::invokedynamic_entries_offset())));
1754 // Scale the index to be the entry index * sizeof(ResolvedIndyEntry)
1755 lsl(index, index, log2i_exact(sizeof(ResolvedIndyEntry)));
1756 add(cache, cache, Array<ResolvedIndyEntry>::base_offset_in_bytes());
1757 lea(cache, Address(cache, index));
1758 }
1759
1760 void InterpreterMacroAssembler::load_field_entry(Register cache, Register index, int bcp_offset) {
1761 // Get index out of bytecode pointer
1762 get_cache_index_at_bcp(index, bcp_offset, sizeof(u2));
1763 // Take shortcut if the size is a power of 2
1764 if (is_power_of_2(sizeof(ResolvedFieldEntry))) {
1765 lsl(index, index, log2i_exact(sizeof(ResolvedFieldEntry))); // Scale index by power of 2
1766 } else {
1767 mov(cache, sizeof(ResolvedFieldEntry));
1768 mul(index, index, cache); // Scale the index to be the entry index * sizeof(ResolvedFieldEntry)
1769 }
1770 // Get address of field entries array
1771 ldr(cache, Address(rcpool, ConstantPoolCache::field_entries_offset()));
1772 add(cache, cache, Array<ResolvedFieldEntry>::base_offset_in_bytes());
1773 lea(cache, Address(cache, index));
1774 // Prevents stale data from being read after the bytecode is patched to the fast bytecode
1775 membar(MacroAssembler::LoadLoad);
1776 }
1777
1778 void InterpreterMacroAssembler::load_method_entry(Register cache, Register index, int bcp_offset) {
1779 // Get index out of bytecode pointer
1780 get_cache_index_at_bcp(index, bcp_offset, sizeof(u2));
1781 mov(cache, sizeof(ResolvedMethodEntry));
1782 mul(index, index, cache); // Scale the index to be the entry index * sizeof(ResolvedMethodEntry)
1783
1784 // Get address of field entries array
1785 ldr(cache, Address(rcpool, ConstantPoolCache::method_entries_offset()));
1786 add(cache, cache, Array<ResolvedMethodEntry>::base_offset_in_bytes());
1787 lea(cache, Address(cache, index));
1788 }