1 /*
2 * Copyright (c) 2003, 2017, 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/method.hpp"
34 #include "oops/methodData.hpp"
35 #include "prims/jvmtiExport.hpp"
36 #include "prims/jvmtiThreadState.hpp"
37 #include "runtime/basicLock.hpp"
38 #include "runtime/biasedLocking.hpp"
39 #include "runtime/safepointMechanism.hpp"
40 #include "runtime/sharedRuntime.hpp"
41 #include "runtime/thread.inline.hpp"
42
43
44 void InterpreterMacroAssembler::narrow(Register result) {
45
46 // Get method->_constMethod->_result_type
47 ldr(rscratch1, Address(rfp, frame::interpreter_frame_method_offset * wordSize));
48 ldr(rscratch1, Address(rscratch1, Method::const_offset()));
49 ldrb(rscratch1, Address(rscratch1, ConstMethod::result_type_offset()));
50
51 Label done, notBool, notByte, notChar;
52
53 // common case first
54 cmpw(rscratch1, T_INT);
55 br(Assembler::EQ, done);
56
57 // mask integer result to narrower return type.
58 cmpw(rscratch1, T_BOOLEAN);
59 br(Assembler::NE, notBool);
60 andw(result, result, 0x1);
61 b(done);
62
63 bind(notBool);
64 cmpw(rscratch1, T_BYTE);
65 br(Assembler::NE, notByte);
66 sbfx(result, result, 0, 8);
67 b(done);
68
69 bind(notByte);
70 cmpw(rscratch1, T_CHAR);
71 br(Assembler::NE, notChar);
72 ubfx(result, result, 0, 16); // truncate upper 16 bits
73 b(done);
74
75 bind(notChar);
76 sbfx(result, result, 0, 16); // sign-extend short
77
78 // Nothing to do for T_INT
79 bind(done);
80 }
81
82 void InterpreterMacroAssembler::jump_to_entry(address entry) {
83 assert(entry, "Entry must have been generated by now");
84 b(entry);
85 }
86
87 void InterpreterMacroAssembler::check_and_handle_popframe(Register java_thread) {
88 if (JvmtiExport::can_pop_frame()) {
89 Label L;
90 // Initiate popframe handling only if it is not already being
91 // processed. If the flag has the popframe_processing bit set, it
92 // means that this code is called *during* popframe handling - we
93 // don't want to reenter.
94 // This method is only called just after the call into the vm in
95 // call_VM_base, so the arg registers are available.
96 ldrw(rscratch1, Address(rthread, JavaThread::popframe_condition_offset()));
97 tbz(rscratch1, exact_log2(JavaThread::popframe_pending_bit), L);
98 tbnz(rscratch1, exact_log2(JavaThread::popframe_processing_bit), L);
99 // Call Interpreter::remove_activation_preserving_args_entry() to get the
100 // address of the same-named entrypoint in the generated interpreter code.
101 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_preserving_args_entry));
102 br(r0);
103 bind(L);
104 }
105 }
106
107
108 void InterpreterMacroAssembler::load_earlyret_value(TosState state) {
109 ldr(r2, Address(rthread, JavaThread::jvmti_thread_state_offset()));
110 const Address tos_addr(r2, JvmtiThreadState::earlyret_tos_offset());
111 const Address oop_addr(r2, JvmtiThreadState::earlyret_oop_offset());
112 const Address val_addr(r2, JvmtiThreadState::earlyret_value_offset());
113 switch (state) {
114 case atos: ldr(r0, oop_addr);
115 str(zr, oop_addr);
116 verify_oop(r0, state); break;
117 case ltos: ldr(r0, val_addr); break;
118 case btos: // fall through
119 case ztos: // fall through
120 case ctos: // fall through
121 case stos: // fall through
122 case itos: ldrw(r0, val_addr); break;
123 case ftos: ldrs(v0, val_addr); break;
124 case dtos: ldrd(v0, val_addr); break;
125 case vtos: /* nothing to do */ break;
126 default : ShouldNotReachHere();
127 }
128 // Clean up tos value in the thread object
129 movw(rscratch1, (int) ilgl);
130 strw(rscratch1, tos_addr);
131 strw(zr, val_addr);
132 }
133
134
135 void InterpreterMacroAssembler::check_and_handle_earlyret(Register java_thread) {
136 if (JvmtiExport::can_force_early_return()) {
137 Label L;
138 ldr(rscratch1, Address(rthread, JavaThread::jvmti_thread_state_offset()));
139 cbz(rscratch1, L); // if (thread->jvmti_thread_state() == NULL) exit;
140
141 // Initiate earlyret handling only if it is not already being processed.
142 // If the flag has the earlyret_processing bit set, it means that this code
143 // is called *during* earlyret handling - we don't want to reenter.
144 ldrw(rscratch1, Address(rscratch1, JvmtiThreadState::earlyret_state_offset()));
145 cmpw(rscratch1, JvmtiThreadState::earlyret_pending);
146 br(Assembler::NE, L);
147
148 // Call Interpreter::remove_activation_early_entry() to get the address of the
149 // same-named entrypoint in the generated interpreter code.
150 ldr(rscratch1, Address(rthread, JavaThread::jvmti_thread_state_offset()));
151 ldrw(rscratch1, Address(rscratch1, JvmtiThreadState::earlyret_tos_offset()));
152 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_early_entry), rscratch1);
153 br(r0);
154 bind(L);
155 }
156 }
157
158 void InterpreterMacroAssembler::get_unsigned_2_byte_index_at_bcp(
159 Register reg,
160 int bcp_offset) {
161 assert(bcp_offset >= 0, "bcp is still pointing to start of bytecode");
162 ldrh(reg, Address(rbcp, bcp_offset));
163 rev16(reg, reg);
164 }
165
166 void InterpreterMacroAssembler::get_dispatch() {
167 unsigned long offset;
168 adrp(rdispatch, ExternalAddress((address)Interpreter::dispatch_table()), offset);
169 lea(rdispatch, Address(rdispatch, offset));
170 }
171
172 void InterpreterMacroAssembler::get_cache_index_at_bcp(Register index,
173 int bcp_offset,
174 size_t index_size) {
175 assert(bcp_offset > 0, "bcp is still pointing to start of bytecode");
176 if (index_size == sizeof(u2)) {
177 load_unsigned_short(index, Address(rbcp, bcp_offset));
178 } else if (index_size == sizeof(u4)) {
179 // assert(EnableInvokeDynamic, "giant index used only for JSR 292");
180 ldrw(index, Address(rbcp, bcp_offset));
181 // Check if the secondary index definition is still ~x, otherwise
182 // we have to change the following assembler code to calculate the
183 // plain index.
184 assert(ConstantPool::decode_invokedynamic_index(~123) == 123, "else change next line");
185 eonw(index, index, zr); // convert to plain index
186 } else if (index_size == sizeof(u1)) {
187 load_unsigned_byte(index, Address(rbcp, bcp_offset));
188 } else {
189 ShouldNotReachHere();
190 }
191 }
192
193 // Return
194 // Rindex: index into constant pool
195 // Rcache: address of cache entry - ConstantPoolCache::base_offset()
196 //
197 // A caller must add ConstantPoolCache::base_offset() to Rcache to get
198 // the true address of the cache entry.
199 //
200 void InterpreterMacroAssembler::get_cache_and_index_at_bcp(Register cache,
201 Register index,
202 int bcp_offset,
203 size_t index_size) {
204 assert_different_registers(cache, index);
205 assert_different_registers(cache, rcpool);
206 get_cache_index_at_bcp(index, bcp_offset, index_size);
207 assert(sizeof(ConstantPoolCacheEntry) == 4 * wordSize, "adjust code below");
208 // convert from field index to ConstantPoolCacheEntry
209 // aarch64 already has the cache in rcpool so there is no need to
210 // install it in cache. instead we pre-add the indexed offset to
211 // rcpool and return it in cache. All clients of this method need to
212 // be modified accordingly.
213 add(cache, rcpool, index, Assembler::LSL, 5);
214 }
215
216
217 void InterpreterMacroAssembler::get_cache_and_index_and_bytecode_at_bcp(Register cache,
218 Register index,
219 Register bytecode,
220 int byte_no,
221 int bcp_offset,
222 size_t index_size) {
223 get_cache_and_index_at_bcp(cache, index, bcp_offset, index_size);
224 // We use a 32-bit load here since the layout of 64-bit words on
225 // little-endian machines allow us that.
226 // n.b. unlike x86 cache already includes the index offset
227 lea(bytecode, Address(cache,
228 ConstantPoolCache::base_offset()
229 + ConstantPoolCacheEntry::indices_offset()));
230 ldarw(bytecode, bytecode);
231 const int shift_count = (1 + byte_no) * BitsPerByte;
232 ubfx(bytecode, bytecode, shift_count, BitsPerByte);
233 }
234
235 void InterpreterMacroAssembler::get_cache_entry_pointer_at_bcp(Register cache,
236 Register tmp,
237 int bcp_offset,
238 size_t index_size) {
239 assert(cache != tmp, "must use different register");
240 get_cache_index_at_bcp(tmp, bcp_offset, index_size);
241 assert(sizeof(ConstantPoolCacheEntry) == 4 * wordSize, "adjust code below");
242 // convert from field index to ConstantPoolCacheEntry index
243 // and from word offset to byte offset
244 assert(exact_log2(in_bytes(ConstantPoolCacheEntry::size_in_bytes())) == 2 + LogBytesPerWord, "else change next line");
245 ldr(cache, Address(rfp, frame::interpreter_frame_cache_offset * wordSize));
246 // skip past the header
247 add(cache, cache, in_bytes(ConstantPoolCache::base_offset()));
248 add(cache, cache, tmp, Assembler::LSL, 2 + LogBytesPerWord); // construct pointer to cache entry
249 }
250
251 void InterpreterMacroAssembler::get_method_counters(Register method,
252 Register mcs, Label& skip) {
253 Label has_counters;
254 ldr(mcs, Address(method, Method::method_counters_offset()));
255 cbnz(mcs, has_counters);
256 call_VM(noreg, CAST_FROM_FN_PTR(address,
257 InterpreterRuntime::build_method_counters), method);
258 ldr(mcs, Address(method, Method::method_counters_offset()));
259 cbz(mcs, skip); // No MethodCounters allocated, OutOfMemory
260 bind(has_counters);
261 }
262
263 // Load object from cpool->resolved_references(index)
264 void InterpreterMacroAssembler::load_resolved_reference_at_index(
265 Register result, Register index) {
266 assert_different_registers(result, index);
267 // convert from field index to resolved_references() index and from
268 // word index to byte offset. Since this is a java object, it can be compressed
269 Register tmp = index; // reuse
270 lslw(tmp, tmp, LogBytesPerHeapOop);
271
272 get_constant_pool(result);
273 // load pointer for resolved_references[] objArray
274 ldr(result, Address(result, ConstantPool::cache_offset_in_bytes()));
275 ldr(result, Address(result, ConstantPoolCache::resolved_references_offset_in_bytes()));
276 resolve_oop_handle(result);
277 // Add in the index
278 add(result, result, tmp);
279 load_heap_oop(result, Address(result, arrayOopDesc::base_offset_in_bytes(T_OBJECT)));
280 }
281
282 void InterpreterMacroAssembler::load_resolved_klass_at_offset(
283 Register cpool, Register index, Register klass, Register temp) {
284 add(temp, cpool, index, LSL, LogBytesPerWord);
285 ldrh(temp, Address(temp, sizeof(ConstantPool))); // temp = resolved_klass_index
286 ldr(klass, Address(cpool, ConstantPool::resolved_klasses_offset_in_bytes())); // klass = cpool->_resolved_klasses
287 add(klass, klass, temp, LSL, LogBytesPerWord);
288 ldr(klass, Address(klass, Array<Klass*>::base_offset_in_bytes()));
289 }
290
291 // Generate a subtype check: branch to ok_is_subtype if sub_klass is a
292 // subtype of super_klass.
293 //
294 // Args:
295 // r0: superklass
296 // Rsub_klass: subklass
297 //
298 // Kills:
299 // r2, r5
300 void InterpreterMacroAssembler::gen_subtype_check(Register Rsub_klass,
301 Label& ok_is_subtype) {
302 assert(Rsub_klass != r0, "r0 holds superklass");
303 assert(Rsub_klass != r2, "r2 holds 2ndary super array length");
304 assert(Rsub_klass != r5, "r5 holds 2ndary super array scan ptr");
305
306 // Profile the not-null value's klass.
307 profile_typecheck(r2, Rsub_klass, r5); // blows r2, reloads r5
308
309 // Do the check.
310 check_klass_subtype(Rsub_klass, r0, r2, ok_is_subtype); // blows r2
311
312 // Profile the failure of the check.
313 profile_typecheck_failed(r2); // blows r2
314 }
315
316 // Java Expression Stack
317
318 void InterpreterMacroAssembler::pop_ptr(Register r) {
319 ldr(r, post(esp, wordSize));
320 }
321
322 void InterpreterMacroAssembler::pop_i(Register r) {
323 ldrw(r, post(esp, wordSize));
324 }
325
326 void InterpreterMacroAssembler::pop_l(Register r) {
327 ldr(r, post(esp, 2 * Interpreter::stackElementSize));
328 }
329
330 void InterpreterMacroAssembler::push_ptr(Register r) {
331 str(r, pre(esp, -wordSize));
332 }
333
334 void InterpreterMacroAssembler::push_i(Register r) {
335 str(r, pre(esp, -wordSize));
336 }
337
338 void InterpreterMacroAssembler::push_l(Register r) {
339 str(zr, pre(esp, -wordSize));
340 str(r, pre(esp, - wordSize));
341 }
342
343 void InterpreterMacroAssembler::pop_f(FloatRegister r) {
344 ldrs(r, post(esp, wordSize));
345 }
346
347 void InterpreterMacroAssembler::pop_d(FloatRegister r) {
348 ldrd(r, post(esp, 2 * Interpreter::stackElementSize));
349 }
350
351 void InterpreterMacroAssembler::push_f(FloatRegister r) {
352 strs(r, pre(esp, -wordSize));
353 }
354
355 void InterpreterMacroAssembler::push_d(FloatRegister r) {
356 strd(r, pre(esp, 2* -wordSize));
357 }
358
359 void InterpreterMacroAssembler::pop(TosState state) {
360 switch (state) {
361 case atos: pop_ptr(); break;
362 case btos:
363 case ztos:
364 case ctos:
365 case stos:
366 case itos: pop_i(); break;
367 case ltos: pop_l(); break;
368 case ftos: pop_f(); break;
369 case dtos: pop_d(); break;
370 case vtos: /* nothing to do */ break;
371 default: ShouldNotReachHere();
372 }
373 verify_oop(r0, state);
374 }
375
376 void InterpreterMacroAssembler::push(TosState state) {
377 verify_oop(r0, state);
378 switch (state) {
379 case atos: push_ptr(); break;
380 case btos:
381 case ztos:
382 case ctos:
383 case stos:
384 case itos: push_i(); break;
385 case ltos: push_l(); break;
386 case ftos: push_f(); break;
387 case dtos: push_d(); break;
388 case vtos: /* nothing to do */ break;
389 default : ShouldNotReachHere();
390 }
391 }
392
393 // Helpers for swap and dup
394 void InterpreterMacroAssembler::load_ptr(int n, Register val) {
395 ldr(val, Address(esp, Interpreter::expr_offset_in_bytes(n)));
396 }
397
398 void InterpreterMacroAssembler::store_ptr(int n, Register val) {
399 str(val, Address(esp, Interpreter::expr_offset_in_bytes(n)));
400 }
401
402
403 void InterpreterMacroAssembler::prepare_to_jump_from_interpreted() {
404 // set sender sp
405 mov(r13, sp);
406 // record last_sp
407 str(esp, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
408 }
409
410 // Jump to from_interpreted entry of a call unless single stepping is possible
411 // in this thread in which case we must call the i2i entry
412 void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) {
413 prepare_to_jump_from_interpreted();
414
415 if (JvmtiExport::can_post_interpreter_events()) {
416 Label run_compiled_code;
417 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
418 // compiled code in threads for which the event is enabled. Check here for
419 // interp_only_mode if these events CAN be enabled.
420 ldrw(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset()));
421 cbzw(rscratch1, run_compiled_code);
422 ldr(rscratch1, Address(method, Method::interpreter_entry_offset()));
423 br(rscratch1);
424 bind(run_compiled_code);
425 }
426
427 ldr(rscratch1, Address(method, Method::from_interpreted_offset()));
428 br(rscratch1);
429 }
430
431 // The following two routines provide a hook so that an implementation
432 // can schedule the dispatch in two parts. amd64 does not do this.
433 void InterpreterMacroAssembler::dispatch_prolog(TosState state, int step) {
434 }
435
436 void InterpreterMacroAssembler::dispatch_epilog(TosState state, int step) {
437 dispatch_next(state, step);
438 }
439
440 void InterpreterMacroAssembler::dispatch_base(TosState state,
441 address* table,
442 bool verifyoop,
443 bool generate_poll) {
444 if (VerifyActivationFrameSize) {
445 Unimplemented();
446 }
447 if (verifyoop) {
448 verify_oop(r0, state);
449 }
450
451 Label safepoint;
452 address* const safepoint_table = Interpreter::safept_table(state);
453 bool needs_thread_local_poll = generate_poll &&
454 SafepointMechanism::uses_thread_local_poll() && table != safepoint_table;
455
456 if (needs_thread_local_poll) {
457 NOT_PRODUCT(block_comment("Thread-local Safepoint poll"));
458 ldr(rscratch2, Address(rthread, Thread::polling_page_offset()));
459 tbnz(rscratch2, exact_log2(SafepointMechanism::poll_bit()), safepoint);
460 }
461
462 if (table == Interpreter::dispatch_table(state)) {
463 addw(rscratch2, rscratch1, Interpreter::distance_from_dispatch_table(state));
464 ldr(rscratch2, Address(rdispatch, rscratch2, Address::uxtw(3)));
465 } else {
466 mov(rscratch2, (address)table);
467 ldr(rscratch2, Address(rscratch2, rscratch1, Address::uxtw(3)));
468 }
469 br(rscratch2);
470
471 if (needs_thread_local_poll) {
472 bind(safepoint);
473 lea(rscratch2, ExternalAddress((address)safepoint_table));
474 ldr(rscratch2, Address(rscratch2, rscratch1, Address::uxtw(3)));
475 br(rscratch2);
476 }
477 }
478
479 void InterpreterMacroAssembler::dispatch_only(TosState state, bool generate_poll) {
480 dispatch_base(state, Interpreter::dispatch_table(state), true, generate_poll);
481 }
482
483 void InterpreterMacroAssembler::dispatch_only_normal(TosState state) {
484 dispatch_base(state, Interpreter::normal_table(state));
485 }
486
487 void InterpreterMacroAssembler::dispatch_only_noverify(TosState state) {
488 dispatch_base(state, Interpreter::normal_table(state), false);
489 }
490
491
492 void InterpreterMacroAssembler::dispatch_next(TosState state, int step, bool generate_poll) {
493 // load next bytecode
494 ldrb(rscratch1, Address(pre(rbcp, step)));
495 dispatch_base(state, Interpreter::dispatch_table(state), generate_poll);
496 }
497
498 void InterpreterMacroAssembler::dispatch_via(TosState state, address* table) {
499 // load current bytecode
500 ldrb(rscratch1, Address(rbcp, 0));
501 dispatch_base(state, table);
502 }
503
504 // remove activation
505 //
506 // Unlock the receiver if this is a synchronized method.
507 // Unlock any Java monitors from syncronized blocks.
508 // Remove the activation from the stack.
509 //
510 // If there are locked Java monitors
511 // If throw_monitor_exception
512 // throws IllegalMonitorStateException
513 // Else if install_monitor_exception
514 // installs IllegalMonitorStateException
515 // Else
516 // no error processing
517 void InterpreterMacroAssembler::remove_activation(
518 TosState state,
519 bool throw_monitor_exception,
520 bool install_monitor_exception,
521 bool notify_jvmdi) {
522 // Note: Registers r3 xmm0 may be in use for the
523 // result check if synchronized method
524 Label unlocked, unlock, no_unlock;
525
526 // get the value of _do_not_unlock_if_synchronized into r3
527 const Address do_not_unlock_if_synchronized(rthread,
528 in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
529 ldrb(r3, do_not_unlock_if_synchronized);
530 strb(zr, do_not_unlock_if_synchronized); // reset the flag
531
532 // get method access flags
533 ldr(r1, Address(rfp, frame::interpreter_frame_method_offset * wordSize));
534 ldr(r2, Address(r1, Method::access_flags_offset()));
535 tbz(r2, exact_log2(JVM_ACC_SYNCHRONIZED), unlocked);
536
537 // Don't unlock anything if the _do_not_unlock_if_synchronized flag
538 // is set.
539 cbnz(r3, no_unlock);
540
541 // unlock monitor
542 push(state); // save result
543
544 // BasicObjectLock will be first in list, since this is a
545 // synchronized method. However, need to check that the object has
546 // not been unlocked by an explicit monitorexit bytecode.
547 const Address monitor(rfp, frame::interpreter_frame_initial_sp_offset *
548 wordSize - (int) sizeof(BasicObjectLock));
549 // We use c_rarg1 so that if we go slow path it will be the correct
550 // register for unlock_object to pass to VM directly
551 lea(c_rarg1, monitor); // address of first monitor
552
553 ldr(r0, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes()));
554 cbnz(r0, unlock);
555
556 pop(state);
557 if (throw_monitor_exception) {
558 // Entry already unlocked, need to throw exception
559 call_VM(noreg, CAST_FROM_FN_PTR(address,
560 InterpreterRuntime::throw_illegal_monitor_state_exception));
561 should_not_reach_here();
562 } else {
563 // Monitor already unlocked during a stack unroll. If requested,
564 // install an illegal_monitor_state_exception. Continue with
565 // stack unrolling.
566 if (install_monitor_exception) {
567 call_VM(noreg, CAST_FROM_FN_PTR(address,
568 InterpreterRuntime::new_illegal_monitor_state_exception));
569 }
570 b(unlocked);
571 }
572
573 bind(unlock);
574 unlock_object(c_rarg1);
575 pop(state);
576
577 // Check that for block-structured locking (i.e., that all locked
578 // objects has been unlocked)
579 bind(unlocked);
580
581 // r0: Might contain return value
582
583 // Check that all monitors are unlocked
584 {
585 Label loop, exception, entry, restart;
586 const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;
587 const Address monitor_block_top(
588 rfp, frame::interpreter_frame_monitor_block_top_offset * wordSize);
589 const Address monitor_block_bot(
590 rfp, frame::interpreter_frame_initial_sp_offset * wordSize);
591
592 bind(restart);
593 // We use c_rarg1 so that if we go slow path it will be the correct
594 // register for unlock_object to pass to VM directly
595 ldr(c_rarg1, monitor_block_top); // points to current entry, starting
596 // with top-most entry
597 lea(r19, monitor_block_bot); // points to word before bottom of
598 // monitor block
599 b(entry);
600
601 // Entry already locked, need to throw exception
602 bind(exception);
603
604 if (throw_monitor_exception) {
605 // Throw exception
606 MacroAssembler::call_VM(noreg,
607 CAST_FROM_FN_PTR(address, InterpreterRuntime::
608 throw_illegal_monitor_state_exception));
609 should_not_reach_here();
610 } else {
611 // Stack unrolling. Unlock object and install illegal_monitor_exception.
612 // Unlock does not block, so don't have to worry about the frame.
613 // We don't have to preserve c_rarg1 since we are going to throw an exception.
614
615 push(state);
616 unlock_object(c_rarg1);
617 pop(state);
618
619 if (install_monitor_exception) {
620 call_VM(noreg, CAST_FROM_FN_PTR(address,
621 InterpreterRuntime::
622 new_illegal_monitor_state_exception));
623 }
624
625 b(restart);
626 }
627
628 bind(loop);
629 // check if current entry is used
630 ldr(rscratch1, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes()));
631 cbnz(rscratch1, exception);
632
633 add(c_rarg1, c_rarg1, entry_size); // otherwise advance to next entry
634 bind(entry);
635 cmp(c_rarg1, r19); // check if bottom reached
636 br(Assembler::NE, loop); // if not at bottom then check this entry
637 }
638
639 bind(no_unlock);
640
641 // jvmti support
642 if (notify_jvmdi) {
643 notify_method_exit(state, NotifyJVMTI); // preserve TOSCA
644 } else {
645 notify_method_exit(state, SkipNotifyJVMTI); // preserve TOSCA
646 }
647
648 // remove activation
649 // get sender esp
650 ldr(esp,
651 Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize));
652 if (StackReservedPages > 0) {
653 // testing if reserved zone needs to be re-enabled
654 Label no_reserved_zone_enabling;
655
656 ldr(rscratch1, Address(rthread, JavaThread::reserved_stack_activation_offset()));
657 cmp(esp, rscratch1);
658 br(Assembler::LS, no_reserved_zone_enabling);
659
660 call_VM_leaf(
661 CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone), rthread);
662 call_VM(noreg, CAST_FROM_FN_PTR(address,
663 InterpreterRuntime::throw_delayed_StackOverflowError));
664 should_not_reach_here();
665
666 bind(no_reserved_zone_enabling);
667 }
668 // remove frame anchor
669 leave();
670 // If we're returning to interpreted code we will shortly be
671 // adjusting SP to allow some space for ESP. If we're returning to
672 // compiled code the saved sender SP was saved in sender_sp, so this
673 // restores it.
674 andr(sp, esp, -16);
675 }
676
677 // Lock object
678 //
679 // Args:
680 // c_rarg1: BasicObjectLock to be used for locking
681 //
682 // Kills:
683 // r0
684 // c_rarg0, c_rarg1, c_rarg2, c_rarg3, .. (param regs)
685 // rscratch1, rscratch2 (scratch regs)
686 void InterpreterMacroAssembler::lock_object(Register lock_reg)
687 {
688 assert(lock_reg == c_rarg1, "The argument is only for looks. It must be c_rarg1");
689 if (UseHeavyMonitors) {
690 call_VM(noreg,
691 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter),
692 lock_reg);
693 } else {
694 Label done;
695
696 const Register swap_reg = r0;
697 const Register tmp = c_rarg2;
698 const Register obj_reg = c_rarg3; // Will contain the oop
699
700 const int obj_offset = BasicObjectLock::obj_offset_in_bytes();
701 const int lock_offset = BasicObjectLock::lock_offset_in_bytes ();
702 const int mark_offset = lock_offset +
703 BasicLock::displaced_header_offset_in_bytes();
704
705 Label slow_case;
706
707 // Load object pointer into obj_reg %c_rarg3
708 ldr(obj_reg, Address(lock_reg, obj_offset));
709
710 if (UseBiasedLocking) {
711 biased_locking_enter(lock_reg, obj_reg, swap_reg, tmp, false, done, &slow_case);
712 }
713
714 // Load (object->mark() | 1) into swap_reg
715 ldr(rscratch1, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
716 orr(swap_reg, rscratch1, 1);
717
718 // Save (object->mark() | 1) into BasicLock's displaced header
719 str(swap_reg, Address(lock_reg, mark_offset));
720
721 assert(lock_offset == 0,
722 "displached header must be first word in BasicObjectLock");
723
724 Label fail;
725 if (PrintBiasedLockingStatistics) {
726 Label fast;
727 cmpxchg_obj_header(swap_reg, lock_reg, obj_reg, rscratch1, fast, &fail);
728 bind(fast);
729 atomic_incw(Address((address)BiasedLocking::fast_path_entry_count_addr()),
730 rscratch2, rscratch1, tmp);
731 b(done);
732 bind(fail);
733 } else {
734 cmpxchg_obj_header(swap_reg, lock_reg, obj_reg, rscratch1, done, /*fallthrough*/NULL);
735 }
736
737 // Test if the oopMark is an obvious stack pointer, i.e.,
738 // 1) (mark & 7) == 0, and
739 // 2) rsp <= mark < mark + os::pagesize()
740 //
741 // These 3 tests can be done by evaluating the following
742 // expression: ((mark - rsp) & (7 - os::vm_page_size())),
743 // assuming both stack pointer and pagesize have their
744 // least significant 3 bits clear.
745 // NOTE: the oopMark is in swap_reg %r0 as the result of cmpxchg
746 // NOTE2: aarch64 does not like to subtract sp from rn so take a
747 // copy
748 mov(rscratch1, sp);
749 sub(swap_reg, swap_reg, rscratch1);
750 ands(swap_reg, swap_reg, (unsigned long)(7 - os::vm_page_size()));
751
752 // Save the test result, for recursive case, the result is zero
753 str(swap_reg, Address(lock_reg, mark_offset));
754
755 if (PrintBiasedLockingStatistics) {
756 br(Assembler::NE, slow_case);
757 atomic_incw(Address((address)BiasedLocking::fast_path_entry_count_addr()),
758 rscratch2, rscratch1, tmp);
759 }
760 br(Assembler::EQ, done);
761
762 bind(slow_case);
763
764 // Call the runtime routine for slow case
765 call_VM(noreg,
766 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter),
767 lock_reg);
768
769 bind(done);
770 }
771 }
772
773
774 // Unlocks an object. Used in monitorexit bytecode and
775 // remove_activation. Throws an IllegalMonitorException if object is
776 // not locked by current thread.
777 //
778 // Args:
779 // c_rarg1: BasicObjectLock for lock
780 //
781 // Kills:
782 // r0
783 // c_rarg0, c_rarg1, c_rarg2, c_rarg3, ... (param regs)
784 // rscratch1, rscratch2 (scratch regs)
785 void InterpreterMacroAssembler::unlock_object(Register lock_reg)
786 {
787 assert(lock_reg == c_rarg1, "The argument is only for looks. It must be rarg1");
788
789 if (UseHeavyMonitors) {
790 call_VM(noreg,
791 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit),
792 lock_reg);
793 } else {
794 Label done;
795
796 const Register swap_reg = r0;
797 const Register header_reg = c_rarg2; // Will contain the old oopMark
798 const Register obj_reg = c_rarg3; // Will contain the oop
799
800 save_bcp(); // Save in case of exception
801
802 // Convert from BasicObjectLock structure to object and BasicLock
803 // structure Store the BasicLock address into %r0
804 lea(swap_reg, Address(lock_reg, BasicObjectLock::lock_offset_in_bytes()));
805
806 // Load oop into obj_reg(%c_rarg3)
807 ldr(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes()));
808
809 // Free entry
810 str(zr, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes()));
811
812 if (UseBiasedLocking) {
813 biased_locking_exit(obj_reg, header_reg, done);
814 }
815
816 // Load the old header from BasicLock structure
817 ldr(header_reg, Address(swap_reg,
818 BasicLock::displaced_header_offset_in_bytes()));
819
820 // Test for recursion
821 cbz(header_reg, done);
822
823 // Atomic swap back the old header
824 cmpxchg_obj_header(swap_reg, header_reg, obj_reg, rscratch1, done, /*fallthrough*/NULL);
825
826 // Call the runtime routine for slow case.
827 str(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes())); // restore obj
828 call_VM(noreg,
829 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit),
830 lock_reg);
831
832 bind(done);
833
834 restore_bcp();
835 }
836 }
837
838 void InterpreterMacroAssembler::test_method_data_pointer(Register mdp,
839 Label& zero_continue) {
840 assert(ProfileInterpreter, "must be profiling interpreter");
841 ldr(mdp, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
842 cbz(mdp, zero_continue);
843 }
844
845 // Set the method data pointer for the current bcp.
846 void InterpreterMacroAssembler::set_method_data_pointer_for_bcp() {
847 assert(ProfileInterpreter, "must be profiling interpreter");
848 Label set_mdp;
849 stp(r0, r1, Address(pre(sp, -2 * wordSize)));
850
851 // Test MDO to avoid the call if it is NULL.
852 ldr(r0, Address(rmethod, in_bytes(Method::method_data_offset())));
853 cbz(r0, set_mdp);
854 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), rmethod, rbcp);
855 // r0: mdi
856 // mdo is guaranteed to be non-zero here, we checked for it before the call.
857 ldr(r1, Address(rmethod, in_bytes(Method::method_data_offset())));
858 lea(r1, Address(r1, in_bytes(MethodData::data_offset())));
859 add(r0, r1, r0);
860 str(r0, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
861 bind(set_mdp);
862 ldp(r0, r1, Address(post(sp, 2 * wordSize)));
863 }
864
865 void InterpreterMacroAssembler::verify_method_data_pointer() {
866 assert(ProfileInterpreter, "must be profiling interpreter");
867 #ifdef ASSERT
868 Label verify_continue;
869 stp(r0, r1, Address(pre(sp, -2 * wordSize)));
870 stp(r2, r3, Address(pre(sp, -2 * wordSize)));
871 test_method_data_pointer(r3, verify_continue); // If mdp is zero, continue
872 get_method(r1);
873
874 // If the mdp is valid, it will point to a DataLayout header which is
875 // consistent with the bcp. The converse is highly probable also.
876 ldrsh(r2, Address(r3, in_bytes(DataLayout::bci_offset())));
877 ldr(rscratch1, Address(r1, Method::const_offset()));
878 add(r2, r2, rscratch1, Assembler::LSL);
879 lea(r2, Address(r2, ConstMethod::codes_offset()));
880 cmp(r2, rbcp);
881 br(Assembler::EQ, verify_continue);
882 // r1: method
883 // rbcp: bcp // rbcp == 22
884 // r3: mdp
885 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp),
886 r1, rbcp, r3);
887 bind(verify_continue);
888 ldp(r2, r3, Address(post(sp, 2 * wordSize)));
889 ldp(r0, r1, Address(post(sp, 2 * wordSize)));
890 #endif // ASSERT
891 }
892
893
894 void InterpreterMacroAssembler::set_mdp_data_at(Register mdp_in,
895 int constant,
896 Register value) {
897 assert(ProfileInterpreter, "must be profiling interpreter");
898 Address data(mdp_in, constant);
899 str(value, data);
900 }
901
902
903 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in,
904 int constant,
905 bool decrement) {
906 increment_mdp_data_at(mdp_in, noreg, constant, decrement);
907 }
908
909 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in,
910 Register reg,
911 int constant,
912 bool decrement) {
913 assert(ProfileInterpreter, "must be profiling interpreter");
914 // %%% this does 64bit counters at best it is wasting space
915 // at worst it is a rare bug when counters overflow
916
917 assert_different_registers(rscratch2, rscratch1, mdp_in, reg);
918
919 Address addr1(mdp_in, constant);
920 Address addr2(rscratch2, reg, Address::lsl(0));
921 Address &addr = addr1;
922 if (reg != noreg) {
923 lea(rscratch2, addr1);
924 addr = addr2;
925 }
926
927 if (decrement) {
928 // Decrement the register. Set condition codes.
929 // Intel does this
930 // addptr(data, (int32_t) -DataLayout::counter_increment);
931 // If the decrement causes the counter to overflow, stay negative
932 // Label L;
933 // jcc(Assembler::negative, L);
934 // addptr(data, (int32_t) DataLayout::counter_increment);
935 // so we do this
936 ldr(rscratch1, addr);
937 subs(rscratch1, rscratch1, (unsigned)DataLayout::counter_increment);
938 Label L;
939 br(Assembler::LO, L); // skip store if counter underflow
940 str(rscratch1, addr);
941 bind(L);
942 } else {
943 assert(DataLayout::counter_increment == 1,
944 "flow-free idiom only works with 1");
945 // Intel does this
946 // Increment the register. Set carry flag.
947 // addptr(data, DataLayout::counter_increment);
948 // If the increment causes the counter to overflow, pull back by 1.
949 // sbbptr(data, (int32_t)0);
950 // so we do this
951 ldr(rscratch1, addr);
952 adds(rscratch1, rscratch1, DataLayout::counter_increment);
953 Label L;
954 br(Assembler::CS, L); // skip store if counter overflow
955 str(rscratch1, addr);
956 bind(L);
957 }
958 }
959
960 void InterpreterMacroAssembler::set_mdp_flag_at(Register mdp_in,
961 int flag_byte_constant) {
962 assert(ProfileInterpreter, "must be profiling interpreter");
963 int header_offset = in_bytes(DataLayout::header_offset());
964 int header_bits = DataLayout::flag_mask_to_header_mask(flag_byte_constant);
965 // Set the flag
966 ldr(rscratch1, Address(mdp_in, header_offset));
967 orr(rscratch1, rscratch1, header_bits);
968 str(rscratch1, Address(mdp_in, header_offset));
969 }
970
971
972 void InterpreterMacroAssembler::test_mdp_data_at(Register mdp_in,
973 int offset,
974 Register value,
975 Register test_value_out,
976 Label& not_equal_continue) {
977 assert(ProfileInterpreter, "must be profiling interpreter");
978 if (test_value_out == noreg) {
979 ldr(rscratch1, Address(mdp_in, offset));
980 cmp(value, rscratch1);
981 } else {
982 // Put the test value into a register, so caller can use it:
983 ldr(test_value_out, Address(mdp_in, offset));
984 cmp(value, test_value_out);
985 }
986 br(Assembler::NE, not_equal_continue);
987 }
988
989
990 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in,
991 int offset_of_disp) {
992 assert(ProfileInterpreter, "must be profiling interpreter");
993 ldr(rscratch1, Address(mdp_in, offset_of_disp));
994 add(mdp_in, mdp_in, rscratch1, LSL);
995 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
996 }
997
998
999 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in,
1000 Register reg,
1001 int offset_of_disp) {
1002 assert(ProfileInterpreter, "must be profiling interpreter");
1003 lea(rscratch1, Address(mdp_in, offset_of_disp));
1004 ldr(rscratch1, Address(rscratch1, reg, Address::lsl(0)));
1005 add(mdp_in, mdp_in, rscratch1, LSL);
1006 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
1007 }
1008
1009
1010 void InterpreterMacroAssembler::update_mdp_by_constant(Register mdp_in,
1011 int constant) {
1012 assert(ProfileInterpreter, "must be profiling interpreter");
1013 add(mdp_in, mdp_in, (unsigned)constant);
1014 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
1015 }
1016
1017
1018 void InterpreterMacroAssembler::update_mdp_for_ret(Register return_bci) {
1019 assert(ProfileInterpreter, "must be profiling interpreter");
1020 // save/restore across call_VM
1021 stp(zr, return_bci, Address(pre(sp, -2 * wordSize)));
1022 call_VM(noreg,
1023 CAST_FROM_FN_PTR(address, InterpreterRuntime::update_mdp_for_ret),
1024 return_bci);
1025 ldp(zr, return_bci, Address(post(sp, 2 * wordSize)));
1026 }
1027
1028
1029 void InterpreterMacroAssembler::profile_taken_branch(Register mdp,
1030 Register bumped_count) {
1031 if (ProfileInterpreter) {
1032 Label profile_continue;
1033
1034 // If no method data exists, go to profile_continue.
1035 // Otherwise, assign to mdp
1036 test_method_data_pointer(mdp, profile_continue);
1037
1038 // We are taking a branch. Increment the taken count.
1039 // We inline increment_mdp_data_at to return bumped_count in a register
1040 //increment_mdp_data_at(mdp, in_bytes(JumpData::taken_offset()));
1041 Address data(mdp, in_bytes(JumpData::taken_offset()));
1042 ldr(bumped_count, data);
1043 assert(DataLayout::counter_increment == 1,
1044 "flow-free idiom only works with 1");
1045 // Intel does this to catch overflow
1046 // addptr(bumped_count, DataLayout::counter_increment);
1047 // sbbptr(bumped_count, 0);
1048 // so we do this
1049 adds(bumped_count, bumped_count, DataLayout::counter_increment);
1050 Label L;
1051 br(Assembler::CS, L); // skip store if counter overflow
1052 str(bumped_count, data);
1053 bind(L);
1054 // The method data pointer needs to be updated to reflect the new target.
1055 update_mdp_by_offset(mdp, in_bytes(JumpData::displacement_offset()));
1056 bind(profile_continue);
1057 }
1058 }
1059
1060
1061 void InterpreterMacroAssembler::profile_not_taken_branch(Register mdp) {
1062 if (ProfileInterpreter) {
1063 Label profile_continue;
1064
1065 // If no method data exists, go to profile_continue.
1066 test_method_data_pointer(mdp, profile_continue);
1067
1068 // We are taking a branch. Increment the not taken count.
1069 increment_mdp_data_at(mdp, in_bytes(BranchData::not_taken_offset()));
1070
1071 // The method data pointer needs to be updated to correspond to
1072 // the next bytecode
1073 update_mdp_by_constant(mdp, in_bytes(BranchData::branch_data_size()));
1074 bind(profile_continue);
1075 }
1076 }
1077
1078
1079 void InterpreterMacroAssembler::profile_call(Register mdp) {
1080 if (ProfileInterpreter) {
1081 Label profile_continue;
1082
1083 // If no method data exists, go to profile_continue.
1084 test_method_data_pointer(mdp, profile_continue);
1085
1086 // We are making a call. Increment the count.
1087 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1088
1089 // The method data pointer needs to be updated to reflect the new target.
1090 update_mdp_by_constant(mdp, in_bytes(CounterData::counter_data_size()));
1091 bind(profile_continue);
1092 }
1093 }
1094
1095 void InterpreterMacroAssembler::profile_final_call(Register mdp) {
1096 if (ProfileInterpreter) {
1097 Label profile_continue;
1098
1099 // If no method data exists, go to profile_continue.
1100 test_method_data_pointer(mdp, profile_continue);
1101
1102 // We are making a call. Increment the count.
1103 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1104
1105 // The method data pointer needs to be updated to reflect the new target.
1106 update_mdp_by_constant(mdp,
1107 in_bytes(VirtualCallData::
1108 virtual_call_data_size()));
1109 bind(profile_continue);
1110 }
1111 }
1112
1113
1114 void InterpreterMacroAssembler::profile_virtual_call(Register receiver,
1115 Register mdp,
1116 Register reg2,
1117 bool receiver_can_be_null) {
1118 if (ProfileInterpreter) {
1119 Label profile_continue;
1120
1121 // If no method data exists, go to profile_continue.
1122 test_method_data_pointer(mdp, profile_continue);
1123
1124 Label skip_receiver_profile;
1125 if (receiver_can_be_null) {
1126 Label not_null;
1127 // We are making a call. Increment the count for null receiver.
1128 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1129 b(skip_receiver_profile);
1130 bind(not_null);
1131 }
1132
1133 // Record the receiver type.
1134 record_klass_in_profile(receiver, mdp, reg2, true);
1135 bind(skip_receiver_profile);
1136
1137 // The method data pointer needs to be updated to reflect the new target.
1138 #if INCLUDE_JVMCI
1139 if (MethodProfileWidth == 0) {
1140 update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size()));
1141 }
1142 #else // INCLUDE_JVMCI
1143 update_mdp_by_constant(mdp,
1144 in_bytes(VirtualCallData::
1145 virtual_call_data_size()));
1146 #endif // INCLUDE_JVMCI
1147 bind(profile_continue);
1148 }
1149 }
1150
1151 #if INCLUDE_JVMCI
1152 void InterpreterMacroAssembler::profile_called_method(Register method, Register mdp, Register reg2) {
1153 assert_different_registers(method, mdp, reg2);
1154 if (ProfileInterpreter && MethodProfileWidth > 0) {
1155 Label profile_continue;
1156
1157 // If no method data exists, go to profile_continue.
1158 test_method_data_pointer(mdp, profile_continue);
1159
1160 Label done;
1161 record_item_in_profile_helper(method, mdp, reg2, 0, done, MethodProfileWidth,
1162 &VirtualCallData::method_offset, &VirtualCallData::method_count_offset, in_bytes(VirtualCallData::nonprofiled_receiver_count_offset()));
1163 bind(done);
1164
1165 update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size()));
1166 bind(profile_continue);
1167 }
1168 }
1169 #endif // INCLUDE_JVMCI
1170
1171 // This routine creates a state machine for updating the multi-row
1172 // type profile at a virtual call site (or other type-sensitive bytecode).
1173 // The machine visits each row (of receiver/count) until the receiver type
1174 // is found, or until it runs out of rows. At the same time, it remembers
1175 // the location of the first empty row. (An empty row records null for its
1176 // receiver, and can be allocated for a newly-observed receiver type.)
1177 // Because there are two degrees of freedom in the state, a simple linear
1178 // search will not work; it must be a decision tree. Hence this helper
1179 // function is recursive, to generate the required tree structured code.
1180 // It's the interpreter, so we are trading off code space for speed.
1181 // See below for example code.
1182 void InterpreterMacroAssembler::record_klass_in_profile_helper(
1183 Register receiver, Register mdp,
1184 Register reg2, int start_row,
1185 Label& done, bool is_virtual_call) {
1186 if (TypeProfileWidth == 0) {
1187 if (is_virtual_call) {
1188 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1189 }
1190 #if INCLUDE_JVMCI
1191 else if (EnableJVMCI) {
1192 increment_mdp_data_at(mdp, in_bytes(ReceiverTypeData::nonprofiled_receiver_count_offset()));
1193 }
1194 #endif // INCLUDE_JVMCI
1195 } else {
1196 int non_profiled_offset = -1;
1197 if (is_virtual_call) {
1198 non_profiled_offset = in_bytes(CounterData::count_offset());
1199 }
1200 #if INCLUDE_JVMCI
1201 else if (EnableJVMCI) {
1202 non_profiled_offset = in_bytes(ReceiverTypeData::nonprofiled_receiver_count_offset());
1203 }
1204 #endif // INCLUDE_JVMCI
1205
1206 record_item_in_profile_helper(receiver, mdp, reg2, 0, done, TypeProfileWidth,
1207 &VirtualCallData::receiver_offset, &VirtualCallData::receiver_count_offset, non_profiled_offset);
1208 }
1209 }
1210
1211 void InterpreterMacroAssembler::record_item_in_profile_helper(Register item, Register mdp,
1212 Register reg2, int start_row, Label& done, int total_rows,
1213 OffsetFunction item_offset_fn, OffsetFunction item_count_offset_fn,
1214 int non_profiled_offset) {
1215 int last_row = total_rows - 1;
1216 assert(start_row <= last_row, "must be work left to do");
1217 // Test this row for both the item and for null.
1218 // Take any of three different outcomes:
1219 // 1. found item => increment count and goto done
1220 // 2. found null => keep looking for case 1, maybe allocate this cell
1221 // 3. found something else => keep looking for cases 1 and 2
1222 // Case 3 is handled by a recursive call.
1223 for (int row = start_row; row <= last_row; row++) {
1224 Label next_test;
1225 bool test_for_null_also = (row == start_row);
1226
1227 // See if the item is item[n].
1228 int item_offset = in_bytes(item_offset_fn(row));
1229 test_mdp_data_at(mdp, item_offset, item,
1230 (test_for_null_also ? reg2 : noreg),
1231 next_test);
1232 // (Reg2 now contains the item from the CallData.)
1233
1234 // The item is item[n]. Increment count[n].
1235 int count_offset = in_bytes(item_count_offset_fn(row));
1236 increment_mdp_data_at(mdp, count_offset);
1237 b(done);
1238 bind(next_test);
1239
1240 if (test_for_null_also) {
1241 Label found_null;
1242 // Failed the equality check on item[n]... Test for null.
1243 if (start_row == last_row) {
1244 // The only thing left to do is handle the null case.
1245 if (non_profiled_offset >= 0) {
1246 cbz(reg2, found_null);
1247 // Item did not match any saved item and there is no empty row for it.
1248 // Increment total counter to indicate polymorphic case.
1249 increment_mdp_data_at(mdp, non_profiled_offset);
1250 b(done);
1251 bind(found_null);
1252 } else {
1253 cbnz(reg2, done);
1254 }
1255 break;
1256 }
1257 // Since null is rare, make it be the branch-taken case.
1258 cbz(reg2, found_null);
1259
1260 // Put all the "Case 3" tests here.
1261 record_item_in_profile_helper(item, mdp, reg2, start_row + 1, done, total_rows,
1262 item_offset_fn, item_count_offset_fn, non_profiled_offset);
1263
1264 // Found a null. Keep searching for a matching item,
1265 // but remember that this is an empty (unused) slot.
1266 bind(found_null);
1267 }
1268 }
1269
1270 // In the fall-through case, we found no matching item, but we
1271 // observed the item[start_row] is NULL.
1272
1273 // Fill in the item field and increment the count.
1274 int item_offset = in_bytes(item_offset_fn(start_row));
1275 set_mdp_data_at(mdp, item_offset, item);
1276 int count_offset = in_bytes(item_count_offset_fn(start_row));
1277 mov(reg2, DataLayout::counter_increment);
1278 set_mdp_data_at(mdp, count_offset, reg2);
1279 if (start_row > 0) {
1280 b(done);
1281 }
1282 }
1283
1284 // Example state machine code for three profile rows:
1285 // // main copy of decision tree, rooted at row[1]
1286 // if (row[0].rec == rec) { row[0].incr(); goto done; }
1287 // if (row[0].rec != NULL) {
1288 // // inner copy of decision tree, rooted at row[1]
1289 // if (row[1].rec == rec) { row[1].incr(); goto done; }
1290 // if (row[1].rec != NULL) {
1291 // // degenerate decision tree, rooted at row[2]
1292 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1293 // if (row[2].rec != NULL) { count.incr(); goto done; } // overflow
1294 // row[2].init(rec); goto done;
1295 // } else {
1296 // // remember row[1] is empty
1297 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1298 // row[1].init(rec); goto done;
1299 // }
1300 // } else {
1301 // // remember row[0] is empty
1302 // if (row[1].rec == rec) { row[1].incr(); goto done; }
1303 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1304 // row[0].init(rec); goto done;
1305 // }
1306 // done:
1307
1308 void InterpreterMacroAssembler::record_klass_in_profile(Register receiver,
1309 Register mdp, Register reg2,
1310 bool is_virtual_call) {
1311 assert(ProfileInterpreter, "must be profiling");
1312 Label done;
1313
1314 record_klass_in_profile_helper(receiver, mdp, reg2, 0, done, is_virtual_call);
1315
1316 bind (done);
1317 }
1318
1319 void InterpreterMacroAssembler::profile_ret(Register return_bci,
1320 Register mdp) {
1321 if (ProfileInterpreter) {
1322 Label profile_continue;
1323 uint row;
1324
1325 // If no method data exists, go to profile_continue.
1326 test_method_data_pointer(mdp, profile_continue);
1327
1328 // Update the total ret count.
1329 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1330
1331 for (row = 0; row < RetData::row_limit(); row++) {
1332 Label next_test;
1333
1334 // See if return_bci is equal to bci[n]:
1335 test_mdp_data_at(mdp,
1336 in_bytes(RetData::bci_offset(row)),
1337 return_bci, noreg,
1338 next_test);
1339
1340 // return_bci is equal to bci[n]. Increment the count.
1341 increment_mdp_data_at(mdp, in_bytes(RetData::bci_count_offset(row)));
1342
1343 // The method data pointer needs to be updated to reflect the new target.
1344 update_mdp_by_offset(mdp,
1345 in_bytes(RetData::bci_displacement_offset(row)));
1346 b(profile_continue);
1347 bind(next_test);
1348 }
1349
1350 update_mdp_for_ret(return_bci);
1351
1352 bind(profile_continue);
1353 }
1354 }
1355
1356 void InterpreterMacroAssembler::profile_null_seen(Register mdp) {
1357 if (ProfileInterpreter) {
1358 Label profile_continue;
1359
1360 // If no method data exists, go to profile_continue.
1361 test_method_data_pointer(mdp, profile_continue);
1362
1363 set_mdp_flag_at(mdp, BitData::null_seen_byte_constant());
1364
1365 // The method data pointer needs to be updated.
1366 int mdp_delta = in_bytes(BitData::bit_data_size());
1367 if (TypeProfileCasts) {
1368 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());
1369 }
1370 update_mdp_by_constant(mdp, mdp_delta);
1371
1372 bind(profile_continue);
1373 }
1374 }
1375
1376 void InterpreterMacroAssembler::profile_typecheck_failed(Register mdp) {
1377 if (ProfileInterpreter && TypeProfileCasts) {
1378 Label profile_continue;
1379
1380 // If no method data exists, go to profile_continue.
1381 test_method_data_pointer(mdp, profile_continue);
1382
1383 int count_offset = in_bytes(CounterData::count_offset());
1384 // Back up the address, since we have already bumped the mdp.
1385 count_offset -= in_bytes(VirtualCallData::virtual_call_data_size());
1386
1387 // *Decrement* the counter. We expect to see zero or small negatives.
1388 increment_mdp_data_at(mdp, count_offset, true);
1389
1390 bind (profile_continue);
1391 }
1392 }
1393
1394 void InterpreterMacroAssembler::profile_typecheck(Register mdp, Register klass, Register reg2) {
1395 if (ProfileInterpreter) {
1396 Label profile_continue;
1397
1398 // If no method data exists, go to profile_continue.
1399 test_method_data_pointer(mdp, profile_continue);
1400
1401 // The method data pointer needs to be updated.
1402 int mdp_delta = in_bytes(BitData::bit_data_size());
1403 if (TypeProfileCasts) {
1404 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());
1405
1406 // Record the object type.
1407 record_klass_in_profile(klass, mdp, reg2, false);
1408 }
1409 update_mdp_by_constant(mdp, mdp_delta);
1410
1411 bind(profile_continue);
1412 }
1413 }
1414
1415 void InterpreterMacroAssembler::profile_switch_default(Register mdp) {
1416 if (ProfileInterpreter) {
1417 Label profile_continue;
1418
1419 // If no method data exists, go to profile_continue.
1420 test_method_data_pointer(mdp, profile_continue);
1421
1422 // Update the default case count
1423 increment_mdp_data_at(mdp,
1424 in_bytes(MultiBranchData::default_count_offset()));
1425
1426 // The method data pointer needs to be updated.
1427 update_mdp_by_offset(mdp,
1428 in_bytes(MultiBranchData::
1429 default_displacement_offset()));
1430
1431 bind(profile_continue);
1432 }
1433 }
1434
1435 void InterpreterMacroAssembler::profile_switch_case(Register index,
1436 Register mdp,
1437 Register reg2) {
1438 if (ProfileInterpreter) {
1439 Label profile_continue;
1440
1441 // If no method data exists, go to profile_continue.
1442 test_method_data_pointer(mdp, profile_continue);
1443
1444 // Build the base (index * per_case_size_in_bytes()) +
1445 // case_array_offset_in_bytes()
1446 movw(reg2, in_bytes(MultiBranchData::per_case_size()));
1447 movw(rscratch1, in_bytes(MultiBranchData::case_array_offset()));
1448 Assembler::maddw(index, index, reg2, rscratch1);
1449
1450 // Update the case count
1451 increment_mdp_data_at(mdp,
1452 index,
1453 in_bytes(MultiBranchData::relative_count_offset()));
1454
1455 // The method data pointer needs to be updated.
1456 update_mdp_by_offset(mdp,
1457 index,
1458 in_bytes(MultiBranchData::
1459 relative_displacement_offset()));
1460
1461 bind(profile_continue);
1462 }
1463 }
1464
1465 void InterpreterMacroAssembler::verify_oop(Register reg, TosState state) {
1466 if (state == atos) {
1467 MacroAssembler::verify_oop(reg);
1468 }
1469 }
1470
1471 void InterpreterMacroAssembler::verify_FPU(int stack_depth, TosState state) { ; }
1472
1473
1474 void InterpreterMacroAssembler::notify_method_entry() {
1475 // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to
1476 // track stack depth. If it is possible to enter interp_only_mode we add
1477 // the code to check if the event should be sent.
1478 if (JvmtiExport::can_post_interpreter_events()) {
1479 Label L;
1480 ldrw(r3, Address(rthread, JavaThread::interp_only_mode_offset()));
1481 cbzw(r3, L);
1482 call_VM(noreg, CAST_FROM_FN_PTR(address,
1483 InterpreterRuntime::post_method_entry));
1484 bind(L);
1485 }
1486
1487 {
1488 SkipIfEqual skip(this, &DTraceMethodProbes, false);
1489 get_method(c_rarg1);
1490 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry),
1491 rthread, c_rarg1);
1492 }
1493
1494 // RedefineClasses() tracing support for obsolete method entry
1495 if (log_is_enabled(Trace, redefine, class, obsolete)) {
1496 get_method(c_rarg1);
1497 call_VM_leaf(
1498 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry),
1499 rthread, c_rarg1);
1500 }
1501
1502 }
1503
1504
1505 void InterpreterMacroAssembler::notify_method_exit(
1506 TosState state, NotifyMethodExitMode mode) {
1507 // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to
1508 // track stack depth. If it is possible to enter interp_only_mode we add
1509 // the code to check if the event should be sent.
1510 if (mode == NotifyJVMTI && JvmtiExport::can_post_interpreter_events()) {
1511 Label L;
1512 // Note: frame::interpreter_frame_result has a dependency on how the
1513 // method result is saved across the call to post_method_exit. If this
1514 // is changed then the interpreter_frame_result implementation will
1515 // need to be updated too.
1516
1517 // template interpreter will leave the result on the top of the stack.
1518 push(state);
1519 ldrw(r3, Address(rthread, JavaThread::interp_only_mode_offset()));
1520 cbz(r3, L);
1521 call_VM(noreg,
1522 CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit));
1523 bind(L);
1524 pop(state);
1525 }
1526
1527 {
1528 SkipIfEqual skip(this, &DTraceMethodProbes, false);
1529 push(state);
1530 get_method(c_rarg1);
1531 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),
1532 rthread, c_rarg1);
1533 pop(state);
1534 }
1535 }
1536
1537
1538 // Jump if ((*counter_addr += increment) & mask) satisfies the condition.
1539 void InterpreterMacroAssembler::increment_mask_and_jump(Address counter_addr,
1540 int increment, Address mask,
1541 Register scratch, Register scratch2,
1542 bool preloaded, Condition cond,
1543 Label* where) {
1544 if (!preloaded) {
1545 ldrw(scratch, counter_addr);
1546 }
1547 add(scratch, scratch, increment);
1548 strw(scratch, counter_addr);
1549 ldrw(scratch2, mask);
1550 ands(scratch, scratch, scratch2);
1551 br(cond, *where);
1552 }
1553
1554 void InterpreterMacroAssembler::call_VM_leaf_base(address entry_point,
1555 int number_of_arguments) {
1556 // interpreter specific
1557 //
1558 // Note: No need to save/restore rbcp & rlocals pointer since these
1559 // are callee saved registers and no blocking/ GC can happen
1560 // in leaf calls.
1561 #ifdef ASSERT
1562 {
1563 Label L;
1564 ldr(rscratch1, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
1565 cbz(rscratch1, L);
1566 stop("InterpreterMacroAssembler::call_VM_leaf_base:"
1567 " last_sp != NULL");
1568 bind(L);
1569 }
1570 #endif /* ASSERT */
1571 // super call
1572 MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments);
1573 }
1574
1575 void InterpreterMacroAssembler::call_VM_base(Register oop_result,
1576 Register java_thread,
1577 Register last_java_sp,
1578 address entry_point,
1579 int number_of_arguments,
1580 bool check_exceptions) {
1581 // interpreter specific
1582 //
1583 // Note: Could avoid restoring locals ptr (callee saved) - however doesn't
1584 // really make a difference for these runtime calls, since they are
1585 // slow anyway. Btw., bcp must be saved/restored since it may change
1586 // due to GC.
1587 // assert(java_thread == noreg , "not expecting a precomputed java thread");
1588 save_bcp();
1589 #ifdef ASSERT
1590 {
1591 Label L;
1592 ldr(rscratch1, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
1593 cbz(rscratch1, L);
1594 stop("InterpreterMacroAssembler::call_VM_leaf_base:"
1595 " last_sp != NULL");
1596 bind(L);
1597 }
1598 #endif /* ASSERT */
1599 // super call
1600 MacroAssembler::call_VM_base(oop_result, noreg, last_java_sp,
1601 entry_point, number_of_arguments,
1602 check_exceptions);
1603 // interpreter specific
1604 restore_bcp();
1605 restore_locals();
1606 }
1607
1608 void InterpreterMacroAssembler::profile_obj_type(Register obj, const Address& mdo_addr) {
1609 Label update, next, none;
1610
1611 verify_oop(obj);
1612
1613 cbnz(obj, update);
1614 orptr(mdo_addr, TypeEntries::null_seen);
1615 b(next);
1616
1617 bind(update);
1618 load_klass(obj, obj);
1619
1620 ldr(rscratch1, mdo_addr);
1621 eor(obj, obj, rscratch1);
1622 tst(obj, TypeEntries::type_klass_mask);
1623 br(Assembler::EQ, next); // klass seen before, nothing to
1624 // do. The unknown bit may have been
1625 // set already but no need to check.
1626
1627 tbnz(obj, exact_log2(TypeEntries::type_unknown), next);
1628 // already unknown. Nothing to do anymore.
1629
1630 ldr(rscratch1, mdo_addr);
1631 cbz(rscratch1, none);
1632 cmp(rscratch1, TypeEntries::null_seen);
1633 br(Assembler::EQ, none);
1634 // There is a chance that the checks above (re-reading profiling
1635 // data from memory) fail if another thread has just set the
1636 // profiling to this obj's klass
1637 ldr(rscratch1, mdo_addr);
1638 eor(obj, obj, rscratch1);
1639 tst(obj, TypeEntries::type_klass_mask);
1640 br(Assembler::EQ, next);
1641
1642 // different than before. Cannot keep accurate profile.
1643 orptr(mdo_addr, TypeEntries::type_unknown);
1644 b(next);
1645
1646 bind(none);
1647 // first time here. Set profile type.
1648 str(obj, mdo_addr);
1649
1650 bind(next);
1651 }
1652
1653 void InterpreterMacroAssembler::profile_arguments_type(Register mdp, Register callee, Register tmp, bool is_virtual) {
1654 if (!ProfileInterpreter) {
1655 return;
1656 }
1657
1658 if (MethodData::profile_arguments() || MethodData::profile_return()) {
1659 Label profile_continue;
1660
1661 test_method_data_pointer(mdp, profile_continue);
1662
1663 int off_to_start = is_virtual ? in_bytes(VirtualCallData::virtual_call_data_size()) : in_bytes(CounterData::counter_data_size());
1664
1665 ldrb(rscratch1, Address(mdp, in_bytes(DataLayout::tag_offset()) - off_to_start));
1666 cmp(rscratch1, is_virtual ? DataLayout::virtual_call_type_data_tag : DataLayout::call_type_data_tag);
1667 br(Assembler::NE, profile_continue);
1668
1669 if (MethodData::profile_arguments()) {
1670 Label done;
1671 int off_to_args = in_bytes(TypeEntriesAtCall::args_data_offset());
1672
1673 for (int i = 0; i < TypeProfileArgsLimit; i++) {
1674 if (i > 0 || MethodData::profile_return()) {
1675 // If return value type is profiled we may have no argument to profile
1676 ldr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset())));
1677 sub(tmp, tmp, i*TypeStackSlotEntries::per_arg_count());
1678 cmp(tmp, TypeStackSlotEntries::per_arg_count());
1679 add(rscratch1, mdp, off_to_args);
1680 br(Assembler::LT, done);
1681 }
1682 ldr(tmp, Address(callee, Method::const_offset()));
1683 load_unsigned_short(tmp, Address(tmp, ConstMethod::size_of_parameters_offset()));
1684 // stack offset o (zero based) from the start of the argument
1685 // list, for n arguments translates into offset n - o - 1 from
1686 // the end of the argument list
1687 ldr(rscratch1, Address(mdp, in_bytes(TypeEntriesAtCall::stack_slot_offset(i))));
1688 sub(tmp, tmp, rscratch1);
1689 sub(tmp, tmp, 1);
1690 Address arg_addr = argument_address(tmp);
1691 ldr(tmp, arg_addr);
1692
1693 Address mdo_arg_addr(mdp, in_bytes(TypeEntriesAtCall::argument_type_offset(i)));
1694 profile_obj_type(tmp, mdo_arg_addr);
1695
1696 int to_add = in_bytes(TypeStackSlotEntries::per_arg_size());
1697 off_to_args += to_add;
1698 }
1699
1700 if (MethodData::profile_return()) {
1701 ldr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset())));
1702 sub(tmp, tmp, TypeProfileArgsLimit*TypeStackSlotEntries::per_arg_count());
1703 }
1704
1705 add(rscratch1, mdp, off_to_args);
1706 bind(done);
1707 mov(mdp, rscratch1);
1708
1709 if (MethodData::profile_return()) {
1710 // We're right after the type profile for the last
1711 // argument. tmp is the number of cells left in the
1712 // CallTypeData/VirtualCallTypeData to reach its end. Non null
1713 // if there's a return to profile.
1714 assert(ReturnTypeEntry::static_cell_count() < TypeStackSlotEntries::per_arg_count(), "can't move past ret type");
1715 add(mdp, mdp, tmp, LSL, exact_log2(DataLayout::cell_size));
1716 }
1717 str(mdp, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
1718 } else {
1719 assert(MethodData::profile_return(), "either profile call args or call ret");
1720 update_mdp_by_constant(mdp, in_bytes(TypeEntriesAtCall::return_only_size()));
1721 }
1722
1723 // mdp points right after the end of the
1724 // CallTypeData/VirtualCallTypeData, right after the cells for the
1725 // return value type if there's one
1726
1727 bind(profile_continue);
1728 }
1729 }
1730
1731 void InterpreterMacroAssembler::profile_return_type(Register mdp, Register ret, Register tmp) {
1732 assert_different_registers(mdp, ret, tmp, rbcp);
1733 if (ProfileInterpreter && MethodData::profile_return()) {
1734 Label profile_continue, done;
1735
1736 test_method_data_pointer(mdp, profile_continue);
1737
1738 if (MethodData::profile_return_jsr292_only()) {
1739 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
1740
1741 // If we don't profile all invoke bytecodes we must make sure
1742 // it's a bytecode we indeed profile. We can't go back to the
1743 // begining of the ProfileData we intend to update to check its
1744 // type because we're right after it and we don't known its
1745 // length
1746 Label do_profile;
1747 ldrb(rscratch1, Address(rbcp, 0));
1748 cmp(rscratch1, Bytecodes::_invokedynamic);
1749 br(Assembler::EQ, do_profile);
1750 cmp(rscratch1, Bytecodes::_invokehandle);
1751 br(Assembler::EQ, do_profile);
1752 get_method(tmp);
1753 ldrh(rscratch1, Address(tmp, Method::intrinsic_id_offset_in_bytes()));
1754 cmp(rscratch1, vmIntrinsics::_compiledLambdaForm);
1755 br(Assembler::NE, profile_continue);
1756
1757 bind(do_profile);
1758 }
1759
1760 Address mdo_ret_addr(mdp, -in_bytes(ReturnTypeEntry::size()));
1761 mov(tmp, ret);
1762 profile_obj_type(tmp, mdo_ret_addr);
1763
1764 bind(profile_continue);
1765 }
1766 }
1767
1768 void InterpreterMacroAssembler::profile_parameters_type(Register mdp, Register tmp1, Register tmp2) {
1769 if (ProfileInterpreter && MethodData::profile_parameters()) {
1770 Label profile_continue, done;
1771
1772 test_method_data_pointer(mdp, profile_continue);
1773
1774 // Load the offset of the area within the MDO used for
1775 // parameters. If it's negative we're not profiling any parameters
1776 ldr(tmp1, Address(mdp, in_bytes(MethodData::parameters_type_data_di_offset()) - in_bytes(MethodData::data_offset())));
1777 tbnz(tmp1, 63, profile_continue); // i.e. sign bit set
1778
1779 // Compute a pointer to the area for parameters from the offset
1780 // and move the pointer to the slot for the last
1781 // parameters. Collect profiling from last parameter down.
1782 // mdo start + parameters offset + array length - 1
1783 add(mdp, mdp, tmp1);
1784 ldr(tmp1, Address(mdp, ArrayData::array_len_offset()));
1785 sub(tmp1, tmp1, TypeStackSlotEntries::per_arg_count());
1786
1787 Label loop;
1788 bind(loop);
1789
1790 int off_base = in_bytes(ParametersTypeData::stack_slot_offset(0));
1791 int type_base = in_bytes(ParametersTypeData::type_offset(0));
1792 int per_arg_scale = exact_log2(DataLayout::cell_size);
1793 add(rscratch1, mdp, off_base);
1794 add(rscratch2, mdp, type_base);
1795
1796 Address arg_off(rscratch1, tmp1, Address::lsl(per_arg_scale));
1797 Address arg_type(rscratch2, tmp1, Address::lsl(per_arg_scale));
1798
1799 // load offset on the stack from the slot for this parameter
1800 ldr(tmp2, arg_off);
1801 neg(tmp2, tmp2);
1802 // read the parameter from the local area
1803 ldr(tmp2, Address(rlocals, tmp2, Address::lsl(Interpreter::logStackElementSize)));
1804
1805 // profile the parameter
1806 profile_obj_type(tmp2, arg_type);
1807
1808 // go to next parameter
1809 subs(tmp1, tmp1, TypeStackSlotEntries::per_arg_count());
1810 br(Assembler::GE, loop);
1811
1812 bind(profile_continue);
1813 }
1814 }