1 /*
2 * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, Red Hat Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "interp_masm_aarch64.hpp"
28 #include "interpreter/interpreter.hpp"
29 #include "interpreter/interpreterRuntime.hpp"
30 #include "logging/log.hpp"
31 #include "oops/arrayOop.hpp"
32 #include "oops/markOop.hpp"
33 #include "oops/methodData.hpp"
34 #include "oops/method.hpp"
35 #include "prims/jvmtiExport.hpp"
36 #include "prims/jvmtiThreadState.hpp"
37 #include "runtime/basicLock.hpp"
38 #include "runtime/biasedLocking.hpp"
39 #include "runtime/sharedRuntime.hpp"
40 #include "runtime/thread.inline.hpp"
41
42
43 void InterpreterMacroAssembler::narrow(Register result) {
44
45 // Get method->_constMethod->_result_type
46 ldr(rscratch1, Address(rfp, frame::interpreter_frame_method_offset * wordSize));
47 ldr(rscratch1, Address(rscratch1, Method::const_offset()));
48 ldrb(rscratch1, Address(rscratch1, ConstMethod::result_type_offset()));
49
50 Label done, notBool, notByte, notChar;
51
52 // common case first
53 cmpw(rscratch1, T_INT);
54 br(Assembler::EQ, done);
55
56 // mask integer result to narrower return type.
57 cmpw(rscratch1, T_BOOLEAN);
58 br(Assembler::NE, notBool);
59 andw(result, result, 0x1);
60 b(done);
61
62 bind(notBool);
63 cmpw(rscratch1, T_BYTE);
64 br(Assembler::NE, notByte);
65 sbfx(result, result, 0, 8);
66 b(done);
67
68 bind(notByte);
69 cmpw(rscratch1, T_CHAR);
70 br(Assembler::NE, notChar);
71 ubfx(result, result, 0, 16); // truncate upper 16 bits
72 b(done);
73
74 bind(notChar);
75 sbfx(result, result, 0, 16); // sign-extend short
76
77 // Nothing to do for T_INT
78 bind(done);
79 }
80
81 void InterpreterMacroAssembler::jump_to_entry(address entry) {
82 assert(entry, "Entry must have been generated by now");
83 b(entry);
84 }
85
86 void InterpreterMacroAssembler::check_and_handle_popframe(Register java_thread) {
87 if (JvmtiExport::can_pop_frame()) {
88 Label L;
89 // Initiate popframe handling only if it is not already being
90 // processed. If the flag has the popframe_processing bit set, it
91 // means that this code is called *during* popframe handling - we
92 // don't want to reenter.
93 // This method is only called just after the call into the vm in
94 // call_VM_base, so the arg registers are available.
95 ldrw(rscratch1, Address(rthread, JavaThread::popframe_condition_offset()));
96 tbz(rscratch1, exact_log2(JavaThread::popframe_pending_bit), L);
97 tbnz(rscratch1, exact_log2(JavaThread::popframe_processing_bit), L);
98 // Call Interpreter::remove_activation_preserving_args_entry() to get the
99 // address of the same-named entrypoint in the generated interpreter code.
100 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_preserving_args_entry));
101 br(r0);
102 bind(L);
103 }
104 }
105
106
107 void InterpreterMacroAssembler::load_earlyret_value(TosState state) {
108 ldr(r2, Address(rthread, JavaThread::jvmti_thread_state_offset()));
109 const Address tos_addr(r2, JvmtiThreadState::earlyret_tos_offset());
110 const Address oop_addr(r2, JvmtiThreadState::earlyret_oop_offset());
111 const Address val_addr(r2, JvmtiThreadState::earlyret_value_offset());
112 switch (state) {
113 case atos: ldr(r0, oop_addr);
114 str(zr, oop_addr);
115 verify_oop(r0, state); break;
116 case ltos: ldr(r0, val_addr); break;
117 case btos: // fall through
118 case ztos: // fall through
119 case ctos: // fall through
120 case stos: // fall through
121 case itos: ldrw(r0, val_addr); break;
122 case ftos: ldrs(v0, val_addr); break;
123 case dtos: ldrd(v0, val_addr); break;
124 case vtos: /* nothing to do */ break;
125 default : ShouldNotReachHere();
126 }
127 // Clean up tos value in the thread object
128 movw(rscratch1, (int) ilgl);
129 strw(rscratch1, tos_addr);
130 strw(zr, val_addr);
131 }
132
133
134 void InterpreterMacroAssembler::check_and_handle_earlyret(Register java_thread) {
135 if (JvmtiExport::can_force_early_return()) {
136 Label L;
137 ldr(rscratch1, Address(rthread, JavaThread::jvmti_thread_state_offset()));
138 cbz(rscratch1, L); // if (thread->jvmti_thread_state() == NULL) exit;
139
140 // Initiate earlyret handling only if it is not already being processed.
141 // If the flag has the earlyret_processing bit set, it means that this code
142 // is called *during* earlyret handling - we don't want to reenter.
143 ldrw(rscratch1, Address(rscratch1, JvmtiThreadState::earlyret_state_offset()));
144 cmpw(rscratch1, JvmtiThreadState::earlyret_pending);
145 br(Assembler::NE, L);
146
147 // Call Interpreter::remove_activation_early_entry() to get the address of the
148 // same-named entrypoint in the generated interpreter code.
149 ldr(rscratch1, Address(rthread, JavaThread::jvmti_thread_state_offset()));
150 ldrw(rscratch1, Address(rscratch1, JvmtiThreadState::earlyret_tos_offset()));
151 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_early_entry), rscratch1);
152 br(r0);
153 bind(L);
154 }
155 }
156
157 void InterpreterMacroAssembler::get_unsigned_2_byte_index_at_bcp(
158 Register reg,
159 int bcp_offset) {
160 assert(bcp_offset >= 0, "bcp is still pointing to start of bytecode");
161 ldrh(reg, Address(rbcp, bcp_offset));
162 rev16(reg, reg);
163 }
164
165 void InterpreterMacroAssembler::get_dispatch() {
166 unsigned long offset;
167 adrp(rdispatch, ExternalAddress((address)Interpreter::dispatch_table()), offset);
168 lea(rdispatch, Address(rdispatch, offset));
169 }
170
171 void InterpreterMacroAssembler::get_cache_index_at_bcp(Register index,
172 int bcp_offset,
173 size_t index_size) {
174 assert(bcp_offset > 0, "bcp is still pointing to start of bytecode");
175 if (index_size == sizeof(u2)) {
176 load_unsigned_short(index, Address(rbcp, bcp_offset));
177 } else if (index_size == sizeof(u4)) {
178 // assert(EnableInvokeDynamic, "giant index used only for JSR 292");
179 ldrw(index, Address(rbcp, bcp_offset));
180 // Check if the secondary index definition is still ~x, otherwise
181 // we have to change the following assembler code to calculate the
182 // plain index.
183 assert(ConstantPool::decode_invokedynamic_index(~123) == 123, "else change next line");
184 eonw(index, index, zr); // convert to plain index
185 } else if (index_size == sizeof(u1)) {
186 load_unsigned_byte(index, Address(rbcp, bcp_offset));
187 } else {
188 ShouldNotReachHere();
189 }
190 }
191
192 // Return
193 // Rindex: index into constant pool
194 // Rcache: address of cache entry - ConstantPoolCache::base_offset()
195 //
196 // A caller must add ConstantPoolCache::base_offset() to Rcache to get
197 // the true address of the cache entry.
198 //
199 void InterpreterMacroAssembler::get_cache_and_index_at_bcp(Register cache,
200 Register index,
201 int bcp_offset,
202 size_t index_size) {
203 assert_different_registers(cache, index);
204 assert_different_registers(cache, rcpool);
205 get_cache_index_at_bcp(index, bcp_offset, index_size);
206 assert(sizeof(ConstantPoolCacheEntry) == 4 * wordSize, "adjust code below");
207 // convert from field index to ConstantPoolCacheEntry
208 // aarch64 already has the cache in rcpool so there is no need to
209 // install it in cache. instead we pre-add the indexed offset to
210 // rcpool and return it in cache. All clients of this method need to
211 // be modified accordingly.
212 add(cache, rcpool, index, Assembler::LSL, 5);
213 }
214
215
216 void InterpreterMacroAssembler::get_cache_and_index_and_bytecode_at_bcp(Register cache,
217 Register index,
218 Register bytecode,
219 int byte_no,
220 int bcp_offset,
221 size_t index_size) {
222 get_cache_and_index_at_bcp(cache, index, bcp_offset, index_size);
223 // We use a 32-bit load here since the layout of 64-bit words on
224 // little-endian machines allow us that.
225 // n.b. unlike x86 cache already includes the index offset
226 lea(bytecode, Address(cache,
227 ConstantPoolCache::base_offset()
228 + ConstantPoolCacheEntry::indices_offset()));
229 ldarw(bytecode, bytecode);
230 const int shift_count = (1 + byte_no) * BitsPerByte;
231 ubfx(bytecode, bytecode, shift_count, BitsPerByte);
232 }
233
234 void InterpreterMacroAssembler::get_cache_entry_pointer_at_bcp(Register cache,
235 Register tmp,
236 int bcp_offset,
237 size_t index_size) {
238 assert(cache != tmp, "must use different register");
239 get_cache_index_at_bcp(tmp, bcp_offset, index_size);
240 assert(sizeof(ConstantPoolCacheEntry) == 4 * wordSize, "adjust code below");
241 // convert from field index to ConstantPoolCacheEntry index
242 // and from word offset to byte offset
243 assert(exact_log2(in_bytes(ConstantPoolCacheEntry::size_in_bytes())) == 2 + LogBytesPerWord, "else change next line");
244 ldr(cache, Address(rfp, frame::interpreter_frame_cache_offset * wordSize));
245 // skip past the header
246 add(cache, cache, in_bytes(ConstantPoolCache::base_offset()));
247 add(cache, cache, tmp, Assembler::LSL, 2 + LogBytesPerWord); // construct pointer to cache entry
248 }
249
250 void InterpreterMacroAssembler::get_method_counters(Register method,
251 Register mcs, Label& skip) {
252 Label has_counters;
253 ldr(mcs, Address(method, Method::method_counters_offset()));
254 cbnz(mcs, has_counters);
255 call_VM(noreg, CAST_FROM_FN_PTR(address,
256 InterpreterRuntime::build_method_counters), method);
257 ldr(mcs, Address(method, Method::method_counters_offset()));
258 cbz(mcs, skip); // No MethodCounters allocated, OutOfMemory
259 bind(has_counters);
260 }
261
262 // Load object from cpool->resolved_references(index)
263 void InterpreterMacroAssembler::load_resolved_reference_at_index(
264 Register result, Register index) {
265 assert_different_registers(result, index);
266 // convert from field index to resolved_references() index and from
267 // word index to byte offset. Since this is a java object, it can be compressed
268 Register tmp = index; // reuse
269 lslw(tmp, tmp, LogBytesPerHeapOop);
270
271 get_constant_pool(result);
272 // load pointer for resolved_references[] objArray
273 ldr(result, Address(result, ConstantPool::resolved_references_offset_in_bytes()));
274 // JNIHandles::resolve(obj);
275 ldr(result, Address(result, 0));
276 // Add in the index
277 add(result, result, tmp);
278 load_heap_oop(result, Address(result, arrayOopDesc::base_offset_in_bytes(T_OBJECT)));
279 }
280
281 // Generate a subtype check: branch to ok_is_subtype if sub_klass is a
282 // subtype of super_klass.
283 //
284 // Args:
285 // r0: superklass
286 // Rsub_klass: subklass
287 //
288 // Kills:
289 // r2, r5
290 void InterpreterMacroAssembler::gen_subtype_check(Register Rsub_klass,
291 Label& ok_is_subtype) {
292 assert(Rsub_klass != r0, "r0 holds superklass");
293 assert(Rsub_klass != r2, "r2 holds 2ndary super array length");
294 assert(Rsub_klass != r5, "r5 holds 2ndary super array scan ptr");
295
296 // Profile the not-null value's klass.
297 profile_typecheck(r2, Rsub_klass, r5); // blows r2, reloads r5
298
299 // Do the check.
300 check_klass_subtype(Rsub_klass, r0, r2, ok_is_subtype); // blows r2
301
302 // Profile the failure of the check.
303 profile_typecheck_failed(r2); // blows r2
304 }
305
306 // Java Expression Stack
307
308 void InterpreterMacroAssembler::pop_ptr(Register r) {
309 ldr(r, post(esp, wordSize));
310 }
311
312 void InterpreterMacroAssembler::pop_i(Register r) {
313 ldrw(r, post(esp, wordSize));
314 }
315
316 void InterpreterMacroAssembler::pop_l(Register r) {
317 ldr(r, post(esp, 2 * Interpreter::stackElementSize));
318 }
319
320 void InterpreterMacroAssembler::push_ptr(Register r) {
321 str(r, pre(esp, -wordSize));
322 }
323
324 void InterpreterMacroAssembler::push_i(Register r) {
325 str(r, pre(esp, -wordSize));
326 }
327
328 void InterpreterMacroAssembler::push_l(Register r) {
329 str(zr, pre(esp, -wordSize));
330 str(r, pre(esp, - wordSize));
331 }
332
333 void InterpreterMacroAssembler::pop_f(FloatRegister r) {
334 ldrs(r, post(esp, wordSize));
335 }
336
337 void InterpreterMacroAssembler::pop_d(FloatRegister r) {
338 ldrd(r, post(esp, 2 * Interpreter::stackElementSize));
339 }
340
341 void InterpreterMacroAssembler::push_f(FloatRegister r) {
342 strs(r, pre(esp, -wordSize));
343 }
344
345 void InterpreterMacroAssembler::push_d(FloatRegister r) {
346 strd(r, pre(esp, 2* -wordSize));
347 }
348
349 void InterpreterMacroAssembler::pop(TosState state) {
350 switch (state) {
351 case atos: pop_ptr(); break;
352 case btos:
353 case ztos:
354 case ctos:
355 case stos:
356 case itos: pop_i(); break;
357 case ltos: pop_l(); break;
358 case ftos: pop_f(); break;
359 case dtos: pop_d(); break;
360 case vtos: /* nothing to do */ break;
361 default: ShouldNotReachHere();
362 }
363 verify_oop(r0, state);
364 }
365
366 void InterpreterMacroAssembler::push(TosState state) {
367 verify_oop(r0, state);
368 switch (state) {
369 case atos: push_ptr(); break;
370 case btos:
371 case ztos:
372 case ctos:
373 case stos:
374 case itos: push_i(); break;
375 case ltos: push_l(); break;
376 case ftos: push_f(); break;
377 case dtos: push_d(); break;
378 case vtos: /* nothing to do */ break;
379 default : ShouldNotReachHere();
380 }
381 }
382
383 // Helpers for swap and dup
384 void InterpreterMacroAssembler::load_ptr(int n, Register val) {
385 ldr(val, Address(esp, Interpreter::expr_offset_in_bytes(n)));
386 }
387
388 void InterpreterMacroAssembler::store_ptr(int n, Register val) {
389 str(val, Address(esp, Interpreter::expr_offset_in_bytes(n)));
390 }
391
392
393 void InterpreterMacroAssembler::prepare_to_jump_from_interpreted() {
394 // set sender sp
395 mov(r13, sp);
396 // record last_sp
397 str(esp, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
398 }
399
400 // Jump to from_interpreted entry of a call unless single stepping is possible
401 // in this thread in which case we must call the i2i entry
402 void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) {
403 prepare_to_jump_from_interpreted();
404
405 if (JvmtiExport::can_post_interpreter_events()) {
406 Label run_compiled_code;
407 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
408 // compiled code in threads for which the event is enabled. Check here for
409 // interp_only_mode if these events CAN be enabled.
410 ldrw(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset()));
411 cbzw(rscratch1, run_compiled_code);
412 ldr(rscratch1, Address(method, Method::interpreter_entry_offset()));
413 br(rscratch1);
414 bind(run_compiled_code);
415 }
416
417 ldr(rscratch1, Address(method, Method::from_interpreted_offset()));
418 br(rscratch1);
419 }
420
421 // The following two routines provide a hook so that an implementation
422 // can schedule the dispatch in two parts. amd64 does not do this.
423 void InterpreterMacroAssembler::dispatch_prolog(TosState state, int step) {
424 }
425
426 void InterpreterMacroAssembler::dispatch_epilog(TosState state, int step) {
427 dispatch_next(state, step);
428 }
429
430 void InterpreterMacroAssembler::dispatch_base(TosState state,
431 address* table,
432 bool verifyoop) {
433 if (VerifyActivationFrameSize) {
434 Unimplemented();
435 }
436 if (verifyoop) {
437 verify_oop(r0, state);
438 }
439 if (table == Interpreter::dispatch_table(state)) {
440 addw(rscratch2, rscratch1, Interpreter::distance_from_dispatch_table(state));
441 ldr(rscratch2, Address(rdispatch, rscratch2, Address::uxtw(3)));
442 } else {
443 mov(rscratch2, (address)table);
444 ldr(rscratch2, Address(rscratch2, rscratch1, Address::uxtw(3)));
445 }
446 br(rscratch2);
447 }
448
449 void InterpreterMacroAssembler::dispatch_only(TosState state) {
450 dispatch_base(state, Interpreter::dispatch_table(state));
451 }
452
453 void InterpreterMacroAssembler::dispatch_only_normal(TosState state) {
454 dispatch_base(state, Interpreter::normal_table(state));
455 }
456
457 void InterpreterMacroAssembler::dispatch_only_noverify(TosState state) {
458 dispatch_base(state, Interpreter::normal_table(state), false);
459 }
460
461
462 void InterpreterMacroAssembler::dispatch_next(TosState state, int step) {
463 // load next bytecode
464 ldrb(rscratch1, Address(pre(rbcp, step)));
465 dispatch_base(state, Interpreter::dispatch_table(state));
466 }
467
468 void InterpreterMacroAssembler::dispatch_via(TosState state, address* table) {
469 // load current bytecode
470 ldrb(rscratch1, Address(rbcp, 0));
471 dispatch_base(state, table);
472 }
473
474 // remove activation
475 //
476 // Unlock the receiver if this is a synchronized method.
477 // Unlock any Java monitors from syncronized blocks.
478 // Remove the activation from the stack.
479 //
480 // If there are locked Java monitors
481 // If throw_monitor_exception
482 // throws IllegalMonitorStateException
483 // Else if install_monitor_exception
484 // installs IllegalMonitorStateException
485 // Else
486 // no error processing
487 void InterpreterMacroAssembler::remove_activation(
488 TosState state,
489 bool throw_monitor_exception,
490 bool install_monitor_exception,
491 bool notify_jvmdi) {
492 // Note: Registers r3 xmm0 may be in use for the
493 // result check if synchronized method
494 Label unlocked, unlock, no_unlock;
495
496 // get the value of _do_not_unlock_if_synchronized into r3
497 const Address do_not_unlock_if_synchronized(rthread,
498 in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
499 ldrb(r3, do_not_unlock_if_synchronized);
500 strb(zr, do_not_unlock_if_synchronized); // reset the flag
501
502 // get method access flags
503 ldr(r1, Address(rfp, frame::interpreter_frame_method_offset * wordSize));
504 ldr(r2, Address(r1, Method::access_flags_offset()));
505 tbz(r2, exact_log2(JVM_ACC_SYNCHRONIZED), unlocked);
506
507 // Don't unlock anything if the _do_not_unlock_if_synchronized flag
508 // is set.
509 cbnz(r3, no_unlock);
510
511 // unlock monitor
512 push(state); // save result
513
514 // BasicObjectLock will be first in list, since this is a
515 // synchronized method. However, need to check that the object has
516 // not been unlocked by an explicit monitorexit bytecode.
517 const Address monitor(rfp, frame::interpreter_frame_initial_sp_offset *
518 wordSize - (int) sizeof(BasicObjectLock));
519 // We use c_rarg1 so that if we go slow path it will be the correct
520 // register for unlock_object to pass to VM directly
521 lea(c_rarg1, monitor); // address of first monitor
522
523 ldr(r0, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes()));
524 cbnz(r0, unlock);
525
526 pop(state);
527 if (throw_monitor_exception) {
528 // Entry already unlocked, need to throw exception
529 call_VM(noreg, CAST_FROM_FN_PTR(address,
530 InterpreterRuntime::throw_illegal_monitor_state_exception));
531 should_not_reach_here();
532 } else {
533 // Monitor already unlocked during a stack unroll. If requested,
534 // install an illegal_monitor_state_exception. Continue with
535 // stack unrolling.
536 if (install_monitor_exception) {
537 call_VM(noreg, CAST_FROM_FN_PTR(address,
538 InterpreterRuntime::new_illegal_monitor_state_exception));
539 }
540 b(unlocked);
541 }
542
543 bind(unlock);
544 unlock_object(c_rarg1);
545 pop(state);
546
547 // Check that for block-structured locking (i.e., that all locked
548 // objects has been unlocked)
549 bind(unlocked);
550
551 // r0: Might contain return value
552
553 // Check that all monitors are unlocked
554 {
555 Label loop, exception, entry, restart;
556 const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;
557 const Address monitor_block_top(
558 rfp, frame::interpreter_frame_monitor_block_top_offset * wordSize);
559 const Address monitor_block_bot(
560 rfp, frame::interpreter_frame_initial_sp_offset * wordSize);
561
562 bind(restart);
563 // We use c_rarg1 so that if we go slow path it will be the correct
564 // register for unlock_object to pass to VM directly
565 ldr(c_rarg1, monitor_block_top); // points to current entry, starting
566 // with top-most entry
567 lea(r19, monitor_block_bot); // points to word before bottom of
568 // monitor block
569 b(entry);
570
571 // Entry already locked, need to throw exception
572 bind(exception);
573
574 if (throw_monitor_exception) {
575 // Throw exception
576 MacroAssembler::call_VM(noreg,
577 CAST_FROM_FN_PTR(address, InterpreterRuntime::
578 throw_illegal_monitor_state_exception));
579 should_not_reach_here();
580 } else {
581 // Stack unrolling. Unlock object and install illegal_monitor_exception.
582 // Unlock does not block, so don't have to worry about the frame.
583 // We don't have to preserve c_rarg1 since we are going to throw an exception.
584
585 push(state);
586 unlock_object(c_rarg1);
587 pop(state);
588
589 if (install_monitor_exception) {
590 call_VM(noreg, CAST_FROM_FN_PTR(address,
591 InterpreterRuntime::
592 new_illegal_monitor_state_exception));
593 }
594
595 b(restart);
596 }
597
598 bind(loop);
599 // check if current entry is used
600 ldr(rscratch1, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes()));
601 cbnz(rscratch1, exception);
602
603 add(c_rarg1, c_rarg1, entry_size); // otherwise advance to next entry
604 bind(entry);
605 cmp(c_rarg1, r19); // check if bottom reached
606 br(Assembler::NE, loop); // if not at bottom then check this entry
607 }
608
609 bind(no_unlock);
610
611 // jvmti support
612 if (notify_jvmdi) {
613 notify_method_exit(state, NotifyJVMTI); // preserve TOSCA
614 } else {
615 notify_method_exit(state, SkipNotifyJVMTI); // preserve TOSCA
616 }
617
618 // remove activation
619 // get sender esp
620 ldr(esp,
621 Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize));
622 if (StackReservedPages > 0) {
623 // testing if reserved zone needs to be re-enabled
624 Label no_reserved_zone_enabling;
625
626 ldr(rscratch1, Address(rthread, JavaThread::reserved_stack_activation_offset()));
627 cmp(esp, rscratch1);
628 br(Assembler::LS, no_reserved_zone_enabling);
629
630 call_VM_leaf(
631 CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone), rthread);
632 call_VM(noreg, CAST_FROM_FN_PTR(address,
633 InterpreterRuntime::throw_delayed_StackOverflowError));
634 should_not_reach_here();
635
636 bind(no_reserved_zone_enabling);
637 }
638 // remove frame anchor
639 leave();
640 // If we're returning to interpreted code we will shortly be
641 // adjusting SP to allow some space for ESP. If we're returning to
642 // compiled code the saved sender SP was saved in sender_sp, so this
643 // restores it.
644 andr(sp, esp, -16);
645 }
646
647 // Lock object
648 //
649 // Args:
650 // c_rarg1: BasicObjectLock to be used for locking
651 //
652 // Kills:
653 // r0
654 // c_rarg0, c_rarg1, c_rarg2, c_rarg3, .. (param regs)
655 // rscratch1, rscratch2 (scratch regs)
656 void InterpreterMacroAssembler::lock_object(Register lock_reg)
657 {
658 assert(lock_reg == c_rarg1, "The argument is only for looks. It must be c_rarg1");
659 if (UseHeavyMonitors) {
660 call_VM(noreg,
661 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter),
662 lock_reg);
663 } else {
664 Label done;
665
666 const Register swap_reg = r0;
667 const Register tmp = c_rarg2;
668 const Register obj_reg = c_rarg3; // Will contain the oop
669
670 const int obj_offset = BasicObjectLock::obj_offset_in_bytes();
671 const int lock_offset = BasicObjectLock::lock_offset_in_bytes ();
672 const int mark_offset = lock_offset +
673 BasicLock::displaced_header_offset_in_bytes();
674
675 Label slow_case;
676
677 // Load object pointer into obj_reg %c_rarg3
678 ldr(obj_reg, Address(lock_reg, obj_offset));
679
680 if (UseBiasedLocking) {
681 biased_locking_enter(lock_reg, obj_reg, swap_reg, tmp, false, done, &slow_case);
682 }
683
684 // Load (object->mark() | 1) into swap_reg
685 ldr(rscratch1, Address(obj_reg, 0));
686 orr(swap_reg, rscratch1, 1);
687
688 // Save (object->mark() | 1) into BasicLock's displaced header
689 str(swap_reg, Address(lock_reg, mark_offset));
690
691 assert(lock_offset == 0,
692 "displached header must be first word in BasicObjectLock");
693
694 Label fail;
695 if (PrintBiasedLockingStatistics) {
696 Label fast;
697 cmpxchgptr(swap_reg, lock_reg, obj_reg, rscratch1, fast, &fail);
698 bind(fast);
699 atomic_incw(Address((address)BiasedLocking::fast_path_entry_count_addr()),
700 rscratch2, rscratch1, tmp);
701 b(done);
702 bind(fail);
703 } else {
704 cmpxchgptr(swap_reg, lock_reg, obj_reg, rscratch1, done, /*fallthrough*/NULL);
705 }
706
707 // Test if the oopMark is an obvious stack pointer, i.e.,
708 // 1) (mark & 7) == 0, and
709 // 2) rsp <= mark < mark + os::pagesize()
710 //
711 // These 3 tests can be done by evaluating the following
712 // expression: ((mark - rsp) & (7 - os::vm_page_size())),
713 // assuming both stack pointer and pagesize have their
714 // least significant 3 bits clear.
715 // NOTE: the oopMark is in swap_reg %r0 as the result of cmpxchg
716 // NOTE2: aarch64 does not like to subtract sp from rn so take a
717 // copy
718 mov(rscratch1, sp);
719 sub(swap_reg, swap_reg, rscratch1);
720 ands(swap_reg, swap_reg, (unsigned long)(7 - os::vm_page_size()));
721
722 // Save the test result, for recursive case, the result is zero
723 str(swap_reg, Address(lock_reg, mark_offset));
724
725 if (PrintBiasedLockingStatistics) {
726 br(Assembler::NE, slow_case);
727 atomic_incw(Address((address)BiasedLocking::fast_path_entry_count_addr()),
728 rscratch2, rscratch1, tmp);
729 }
730 br(Assembler::EQ, done);
731
732 bind(slow_case);
733
734 // Call the runtime routine for slow case
735 call_VM(noreg,
736 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter),
737 lock_reg);
738
739 bind(done);
740 }
741 }
742
743
744 // Unlocks an object. Used in monitorexit bytecode and
745 // remove_activation. Throws an IllegalMonitorException if object is
746 // not locked by current thread.
747 //
748 // Args:
749 // c_rarg1: BasicObjectLock for lock
750 //
751 // Kills:
752 // r0
753 // c_rarg0, c_rarg1, c_rarg2, c_rarg3, ... (param regs)
754 // rscratch1, rscratch2 (scratch regs)
755 void InterpreterMacroAssembler::unlock_object(Register lock_reg)
756 {
757 assert(lock_reg == c_rarg1, "The argument is only for looks. It must be rarg1");
758
759 if (UseHeavyMonitors) {
760 call_VM(noreg,
761 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit),
762 lock_reg);
763 } else {
764 Label done;
765
766 const Register swap_reg = r0;
767 const Register header_reg = c_rarg2; // Will contain the old oopMark
768 const Register obj_reg = c_rarg3; // Will contain the oop
769
770 save_bcp(); // Save in case of exception
771
772 // Convert from BasicObjectLock structure to object and BasicLock
773 // structure Store the BasicLock address into %r0
774 lea(swap_reg, Address(lock_reg, BasicObjectLock::lock_offset_in_bytes()));
775
776 // Load oop into obj_reg(%c_rarg3)
777 ldr(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes()));
778
779 // Free entry
780 str(zr, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes()));
781
782 if (UseBiasedLocking) {
783 biased_locking_exit(obj_reg, header_reg, done);
784 }
785
786 // Load the old header from BasicLock structure
787 ldr(header_reg, Address(swap_reg,
788 BasicLock::displaced_header_offset_in_bytes()));
789
790 // Test for recursion
791 cbz(header_reg, done);
792
793 // Atomic swap back the old header
794 cmpxchgptr(swap_reg, header_reg, obj_reg, rscratch1, done, /*fallthrough*/NULL);
795
796 // Call the runtime routine for slow case.
797 str(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes())); // restore obj
798 call_VM(noreg,
799 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit),
800 lock_reg);
801
802 bind(done);
803
804 restore_bcp();
805 }
806 }
807
808 void InterpreterMacroAssembler::test_method_data_pointer(Register mdp,
809 Label& zero_continue) {
810 assert(ProfileInterpreter, "must be profiling interpreter");
811 ldr(mdp, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
812 cbz(mdp, zero_continue);
813 }
814
815 // Set the method data pointer for the current bcp.
816 void InterpreterMacroAssembler::set_method_data_pointer_for_bcp() {
817 assert(ProfileInterpreter, "must be profiling interpreter");
818 Label set_mdp;
819 stp(r0, r1, Address(pre(sp, -2 * wordSize)));
820
821 // Test MDO to avoid the call if it is NULL.
822 ldr(r0, Address(rmethod, in_bytes(Method::method_data_offset())));
823 cbz(r0, set_mdp);
824 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), rmethod, rbcp);
825 // r0: mdi
826 // mdo is guaranteed to be non-zero here, we checked for it before the call.
827 ldr(r1, Address(rmethod, in_bytes(Method::method_data_offset())));
828 lea(r1, Address(r1, in_bytes(MethodData::data_offset())));
829 add(r0, r1, r0);
830 str(r0, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
831 bind(set_mdp);
832 ldp(r0, r1, Address(post(sp, 2 * wordSize)));
833 }
834
835 void InterpreterMacroAssembler::verify_method_data_pointer() {
836 assert(ProfileInterpreter, "must be profiling interpreter");
837 #ifdef ASSERT
838 Label verify_continue;
839 stp(r0, r1, Address(pre(sp, -2 * wordSize)));
840 stp(r2, r3, Address(pre(sp, -2 * wordSize)));
841 test_method_data_pointer(r3, verify_continue); // If mdp is zero, continue
842 get_method(r1);
843
844 // If the mdp is valid, it will point to a DataLayout header which is
845 // consistent with the bcp. The converse is highly probable also.
846 ldrsh(r2, Address(r3, in_bytes(DataLayout::bci_offset())));
847 ldr(rscratch1, Address(r1, Method::const_offset()));
848 add(r2, r2, rscratch1, Assembler::LSL);
849 lea(r2, Address(r2, ConstMethod::codes_offset()));
850 cmp(r2, rbcp);
851 br(Assembler::EQ, verify_continue);
852 // r1: method
853 // rbcp: bcp // rbcp == 22
854 // r3: mdp
855 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp),
856 r1, rbcp, r3);
857 bind(verify_continue);
858 ldp(r2, r3, Address(post(sp, 2 * wordSize)));
859 ldp(r0, r1, Address(post(sp, 2 * wordSize)));
860 #endif // ASSERT
861 }
862
863
864 void InterpreterMacroAssembler::set_mdp_data_at(Register mdp_in,
865 int constant,
866 Register value) {
867 assert(ProfileInterpreter, "must be profiling interpreter");
868 Address data(mdp_in, constant);
869 str(value, data);
870 }
871
872
873 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in,
874 int constant,
875 bool decrement) {
876 increment_mdp_data_at(mdp_in, noreg, constant, decrement);
877 }
878
879 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in,
880 Register reg,
881 int constant,
882 bool decrement) {
883 assert(ProfileInterpreter, "must be profiling interpreter");
884 // %%% this does 64bit counters at best it is wasting space
885 // at worst it is a rare bug when counters overflow
886
887 assert_different_registers(rscratch2, rscratch1, mdp_in, reg);
888
889 Address addr1(mdp_in, constant);
890 Address addr2(rscratch2, reg, Address::lsl(0));
891 Address &addr = addr1;
892 if (reg != noreg) {
893 lea(rscratch2, addr1);
894 addr = addr2;
895 }
896
897 if (decrement) {
898 // Decrement the register. Set condition codes.
899 // Intel does this
900 // addptr(data, (int32_t) -DataLayout::counter_increment);
901 // If the decrement causes the counter to overflow, stay negative
902 // Label L;
903 // jcc(Assembler::negative, L);
904 // addptr(data, (int32_t) DataLayout::counter_increment);
905 // so we do this
906 ldr(rscratch1, addr);
907 subs(rscratch1, rscratch1, (unsigned)DataLayout::counter_increment);
908 Label L;
909 br(Assembler::LO, L); // skip store if counter underflow
910 str(rscratch1, addr);
911 bind(L);
912 } else {
913 assert(DataLayout::counter_increment == 1,
914 "flow-free idiom only works with 1");
915 // Intel does this
916 // Increment the register. Set carry flag.
917 // addptr(data, DataLayout::counter_increment);
918 // If the increment causes the counter to overflow, pull back by 1.
919 // sbbptr(data, (int32_t)0);
920 // so we do this
921 ldr(rscratch1, addr);
922 adds(rscratch1, rscratch1, DataLayout::counter_increment);
923 Label L;
924 br(Assembler::CS, L); // skip store if counter overflow
925 str(rscratch1, addr);
926 bind(L);
927 }
928 }
929
930 void InterpreterMacroAssembler::set_mdp_flag_at(Register mdp_in,
931 int flag_byte_constant) {
932 assert(ProfileInterpreter, "must be profiling interpreter");
933 int header_offset = in_bytes(DataLayout::header_offset());
934 int header_bits = DataLayout::flag_mask_to_header_mask(flag_byte_constant);
935 // Set the flag
936 ldr(rscratch1, Address(mdp_in, header_offset));
937 orr(rscratch1, rscratch1, header_bits);
938 str(rscratch1, Address(mdp_in, header_offset));
939 }
940
941
942 void InterpreterMacroAssembler::test_mdp_data_at(Register mdp_in,
943 int offset,
944 Register value,
945 Register test_value_out,
946 Label& not_equal_continue) {
947 assert(ProfileInterpreter, "must be profiling interpreter");
948 if (test_value_out == noreg) {
949 ldr(rscratch1, Address(mdp_in, offset));
950 cmp(value, rscratch1);
951 } else {
952 // Put the test value into a register, so caller can use it:
953 ldr(test_value_out, Address(mdp_in, offset));
954 cmp(value, test_value_out);
955 }
956 br(Assembler::NE, not_equal_continue);
957 }
958
959
960 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in,
961 int offset_of_disp) {
962 assert(ProfileInterpreter, "must be profiling interpreter");
963 ldr(rscratch1, Address(mdp_in, offset_of_disp));
964 add(mdp_in, mdp_in, rscratch1, LSL);
965 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
966 }
967
968
969 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in,
970 Register reg,
971 int offset_of_disp) {
972 assert(ProfileInterpreter, "must be profiling interpreter");
973 lea(rscratch1, Address(mdp_in, offset_of_disp));
974 ldr(rscratch1, Address(rscratch1, reg, Address::lsl(0)));
975 add(mdp_in, mdp_in, rscratch1, LSL);
976 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
977 }
978
979
980 void InterpreterMacroAssembler::update_mdp_by_constant(Register mdp_in,
981 int constant) {
982 assert(ProfileInterpreter, "must be profiling interpreter");
983 add(mdp_in, mdp_in, (unsigned)constant);
984 str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
985 }
986
987
988 void InterpreterMacroAssembler::update_mdp_for_ret(Register return_bci) {
989 assert(ProfileInterpreter, "must be profiling interpreter");
990 // save/restore across call_VM
991 stp(zr, return_bci, Address(pre(sp, -2 * wordSize)));
992 call_VM(noreg,
993 CAST_FROM_FN_PTR(address, InterpreterRuntime::update_mdp_for_ret),
994 return_bci);
995 ldp(zr, return_bci, Address(post(sp, 2 * wordSize)));
996 }
997
998
999 void InterpreterMacroAssembler::profile_taken_branch(Register mdp,
1000 Register bumped_count) {
1001 if (ProfileInterpreter) {
1002 Label profile_continue;
1003
1004 // If no method data exists, go to profile_continue.
1005 // Otherwise, assign to mdp
1006 test_method_data_pointer(mdp, profile_continue);
1007
1008 // We are taking a branch. Increment the taken count.
1009 // We inline increment_mdp_data_at to return bumped_count in a register
1010 //increment_mdp_data_at(mdp, in_bytes(JumpData::taken_offset()));
1011 Address data(mdp, in_bytes(JumpData::taken_offset()));
1012 ldr(bumped_count, data);
1013 assert(DataLayout::counter_increment == 1,
1014 "flow-free idiom only works with 1");
1015 // Intel does this to catch overflow
1016 // addptr(bumped_count, DataLayout::counter_increment);
1017 // sbbptr(bumped_count, 0);
1018 // so we do this
1019 adds(bumped_count, bumped_count, DataLayout::counter_increment);
1020 Label L;
1021 br(Assembler::CS, L); // skip store if counter overflow
1022 str(bumped_count, data);
1023 bind(L);
1024 // The method data pointer needs to be updated to reflect the new target.
1025 update_mdp_by_offset(mdp, in_bytes(JumpData::displacement_offset()));
1026 bind(profile_continue);
1027 }
1028 }
1029
1030
1031 void InterpreterMacroAssembler::profile_not_taken_branch(Register mdp) {
1032 if (ProfileInterpreter) {
1033 Label profile_continue;
1034
1035 // If no method data exists, go to profile_continue.
1036 test_method_data_pointer(mdp, profile_continue);
1037
1038 // We are taking a branch. Increment the not taken count.
1039 increment_mdp_data_at(mdp, in_bytes(BranchData::not_taken_offset()));
1040
1041 // The method data pointer needs to be updated to correspond to
1042 // the next bytecode
1043 update_mdp_by_constant(mdp, in_bytes(BranchData::branch_data_size()));
1044 bind(profile_continue);
1045 }
1046 }
1047
1048
1049 void InterpreterMacroAssembler::profile_call(Register mdp) {
1050 if (ProfileInterpreter) {
1051 Label profile_continue;
1052
1053 // If no method data exists, go to profile_continue.
1054 test_method_data_pointer(mdp, profile_continue);
1055
1056 // We are making a call. Increment the count.
1057 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1058
1059 // The method data pointer needs to be updated to reflect the new target.
1060 update_mdp_by_constant(mdp, in_bytes(CounterData::counter_data_size()));
1061 bind(profile_continue);
1062 }
1063 }
1064
1065 void InterpreterMacroAssembler::profile_final_call(Register mdp) {
1066 if (ProfileInterpreter) {
1067 Label profile_continue;
1068
1069 // If no method data exists, go to profile_continue.
1070 test_method_data_pointer(mdp, profile_continue);
1071
1072 // We are making a call. Increment the count.
1073 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1074
1075 // The method data pointer needs to be updated to reflect the new target.
1076 update_mdp_by_constant(mdp,
1077 in_bytes(VirtualCallData::
1078 virtual_call_data_size()));
1079 bind(profile_continue);
1080 }
1081 }
1082
1083
1084 void InterpreterMacroAssembler::profile_virtual_call(Register receiver,
1085 Register mdp,
1086 Register reg2,
1087 bool receiver_can_be_null) {
1088 if (ProfileInterpreter) {
1089 Label profile_continue;
1090
1091 // If no method data exists, go to profile_continue.
1092 test_method_data_pointer(mdp, profile_continue);
1093
1094 Label skip_receiver_profile;
1095 if (receiver_can_be_null) {
1096 Label not_null;
1097 // We are making a call. Increment the count for null receiver.
1098 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1099 b(skip_receiver_profile);
1100 bind(not_null);
1101 }
1102
1103 // Record the receiver type.
1104 record_klass_in_profile(receiver, mdp, reg2, true);
1105 bind(skip_receiver_profile);
1106
1107 // The method data pointer needs to be updated to reflect the new target.
1108 #if INCLUDE_JVMCI
1109 if (MethodProfileWidth == 0) {
1110 update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size()));
1111 }
1112 #else // INCLUDE_JVMCI
1113 update_mdp_by_constant(mdp,
1114 in_bytes(VirtualCallData::
1115 virtual_call_data_size()));
1116 #endif // INCLUDE_JVMCI
1117 bind(profile_continue);
1118 }
1119 }
1120
1121 #if INCLUDE_JVMCI
1122 void InterpreterMacroAssembler::profile_called_method(Register method, Register mdp, Register reg2) {
1123 assert_different_registers(method, mdp, reg2);
1124 if (ProfileInterpreter && MethodProfileWidth > 0) {
1125 Label profile_continue;
1126
1127 // If no method data exists, go to profile_continue.
1128 test_method_data_pointer(mdp, profile_continue);
1129
1130 Label done;
1131 record_item_in_profile_helper(method, mdp, reg2, 0, done, MethodProfileWidth,
1132 &VirtualCallData::method_offset, &VirtualCallData::method_count_offset, in_bytes(VirtualCallData::nonprofiled_receiver_count_offset()));
1133 bind(done);
1134
1135 update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size()));
1136 bind(profile_continue);
1137 }
1138 }
1139 #endif // INCLUDE_JVMCI
1140
1141 // This routine creates a state machine for updating the multi-row
1142 // type profile at a virtual call site (or other type-sensitive bytecode).
1143 // The machine visits each row (of receiver/count) until the receiver type
1144 // is found, or until it runs out of rows. At the same time, it remembers
1145 // the location of the first empty row. (An empty row records null for its
1146 // receiver, and can be allocated for a newly-observed receiver type.)
1147 // Because there are two degrees of freedom in the state, a simple linear
1148 // search will not work; it must be a decision tree. Hence this helper
1149 // function is recursive, to generate the required tree structured code.
1150 // It's the interpreter, so we are trading off code space for speed.
1151 // See below for example code.
1152 void InterpreterMacroAssembler::record_klass_in_profile_helper(
1153 Register receiver, Register mdp,
1154 Register reg2, int start_row,
1155 Label& done, bool is_virtual_call) {
1156 if (TypeProfileWidth == 0) {
1157 if (is_virtual_call) {
1158 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1159 }
1160 #if INCLUDE_JVMCI
1161 else if (EnableJVMCI) {
1162 increment_mdp_data_at(mdp, in_bytes(ReceiverTypeData::nonprofiled_receiver_count_offset()));
1163 }
1164 #endif // INCLUDE_JVMCI
1165 } else {
1166 int non_profiled_offset = -1;
1167 if (is_virtual_call) {
1168 non_profiled_offset = in_bytes(CounterData::count_offset());
1169 }
1170 #if INCLUDE_JVMCI
1171 else if (EnableJVMCI) {
1172 non_profiled_offset = in_bytes(ReceiverTypeData::nonprofiled_receiver_count_offset());
1173 }
1174 #endif // INCLUDE_JVMCI
1175
1176 record_item_in_profile_helper(receiver, mdp, reg2, 0, done, TypeProfileWidth,
1177 &VirtualCallData::receiver_offset, &VirtualCallData::receiver_count_offset, non_profiled_offset);
1178 }
1179 }
1180
1181 void InterpreterMacroAssembler::record_item_in_profile_helper(Register item, Register mdp,
1182 Register reg2, int start_row, Label& done, int total_rows,
1183 OffsetFunction item_offset_fn, OffsetFunction item_count_offset_fn,
1184 int non_profiled_offset) {
1185 int last_row = total_rows - 1;
1186 assert(start_row <= last_row, "must be work left to do");
1187 // Test this row for both the item and for null.
1188 // Take any of three different outcomes:
1189 // 1. found item => increment count and goto done
1190 // 2. found null => keep looking for case 1, maybe allocate this cell
1191 // 3. found something else => keep looking for cases 1 and 2
1192 // Case 3 is handled by a recursive call.
1193 for (int row = start_row; row <= last_row; row++) {
1194 Label next_test;
1195 bool test_for_null_also = (row == start_row);
1196
1197 // See if the item is item[n].
1198 int item_offset = in_bytes(item_offset_fn(row));
1199 test_mdp_data_at(mdp, item_offset, item,
1200 (test_for_null_also ? reg2 : noreg),
1201 next_test);
1202 // (Reg2 now contains the item from the CallData.)
1203
1204 // The item is item[n]. Increment count[n].
1205 int count_offset = in_bytes(item_count_offset_fn(row));
1206 increment_mdp_data_at(mdp, count_offset);
1207 b(done);
1208 bind(next_test);
1209
1210 if (test_for_null_also) {
1211 Label found_null;
1212 // Failed the equality check on item[n]... Test for null.
1213 if (start_row == last_row) {
1214 // The only thing left to do is handle the null case.
1215 if (non_profiled_offset >= 0) {
1216 cbz(reg2, found_null);
1217 // Item did not match any saved item and there is no empty row for it.
1218 // Increment total counter to indicate polymorphic case.
1219 increment_mdp_data_at(mdp, non_profiled_offset);
1220 b(done);
1221 bind(found_null);
1222 } else {
1223 cbnz(reg2, done);
1224 }
1225 break;
1226 }
1227 // Since null is rare, make it be the branch-taken case.
1228 cbz(reg2, found_null);
1229
1230 // Put all the "Case 3" tests here.
1231 record_item_in_profile_helper(item, mdp, reg2, start_row + 1, done, total_rows,
1232 item_offset_fn, item_count_offset_fn, non_profiled_offset);
1233
1234 // Found a null. Keep searching for a matching item,
1235 // but remember that this is an empty (unused) slot.
1236 bind(found_null);
1237 }
1238 }
1239
1240 // In the fall-through case, we found no matching item, but we
1241 // observed the item[start_row] is NULL.
1242
1243 // Fill in the item field and increment the count.
1244 int item_offset = in_bytes(item_offset_fn(start_row));
1245 set_mdp_data_at(mdp, item_offset, item);
1246 int count_offset = in_bytes(item_count_offset_fn(start_row));
1247 mov(reg2, DataLayout::counter_increment);
1248 set_mdp_data_at(mdp, count_offset, reg2);
1249 if (start_row > 0) {
1250 b(done);
1251 }
1252 }
1253
1254 // Example state machine code for three profile rows:
1255 // // main copy of decision tree, rooted at row[1]
1256 // if (row[0].rec == rec) { row[0].incr(); goto done; }
1257 // if (row[0].rec != NULL) {
1258 // // inner copy of decision tree, rooted at row[1]
1259 // if (row[1].rec == rec) { row[1].incr(); goto done; }
1260 // if (row[1].rec != NULL) {
1261 // // degenerate decision tree, rooted at row[2]
1262 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1263 // if (row[2].rec != NULL) { count.incr(); goto done; } // overflow
1264 // row[2].init(rec); goto done;
1265 // } else {
1266 // // remember row[1] is empty
1267 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1268 // row[1].init(rec); goto done;
1269 // }
1270 // } else {
1271 // // remember row[0] is empty
1272 // if (row[1].rec == rec) { row[1].incr(); goto done; }
1273 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1274 // row[0].init(rec); goto done;
1275 // }
1276 // done:
1277
1278 void InterpreterMacroAssembler::record_klass_in_profile(Register receiver,
1279 Register mdp, Register reg2,
1280 bool is_virtual_call) {
1281 assert(ProfileInterpreter, "must be profiling");
1282 Label done;
1283
1284 record_klass_in_profile_helper(receiver, mdp, reg2, 0, done, is_virtual_call);
1285
1286 bind (done);
1287 }
1288
1289 void InterpreterMacroAssembler::profile_ret(Register return_bci,
1290 Register mdp) {
1291 if (ProfileInterpreter) {
1292 Label profile_continue;
1293 uint row;
1294
1295 // If no method data exists, go to profile_continue.
1296 test_method_data_pointer(mdp, profile_continue);
1297
1298 // Update the total ret count.
1299 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1300
1301 for (row = 0; row < RetData::row_limit(); row++) {
1302 Label next_test;
1303
1304 // See if return_bci is equal to bci[n]:
1305 test_mdp_data_at(mdp,
1306 in_bytes(RetData::bci_offset(row)),
1307 return_bci, noreg,
1308 next_test);
1309
1310 // return_bci is equal to bci[n]. Increment the count.
1311 increment_mdp_data_at(mdp, in_bytes(RetData::bci_count_offset(row)));
1312
1313 // The method data pointer needs to be updated to reflect the new target.
1314 update_mdp_by_offset(mdp,
1315 in_bytes(RetData::bci_displacement_offset(row)));
1316 b(profile_continue);
1317 bind(next_test);
1318 }
1319
1320 update_mdp_for_ret(return_bci);
1321
1322 bind(profile_continue);
1323 }
1324 }
1325
1326 void InterpreterMacroAssembler::profile_null_seen(Register mdp) {
1327 if (ProfileInterpreter) {
1328 Label profile_continue;
1329
1330 // If no method data exists, go to profile_continue.
1331 test_method_data_pointer(mdp, profile_continue);
1332
1333 set_mdp_flag_at(mdp, BitData::null_seen_byte_constant());
1334
1335 // The method data pointer needs to be updated.
1336 int mdp_delta = in_bytes(BitData::bit_data_size());
1337 if (TypeProfileCasts) {
1338 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());
1339 }
1340 update_mdp_by_constant(mdp, mdp_delta);
1341
1342 bind(profile_continue);
1343 }
1344 }
1345
1346 void InterpreterMacroAssembler::profile_typecheck_failed(Register mdp) {
1347 if (ProfileInterpreter && TypeProfileCasts) {
1348 Label profile_continue;
1349
1350 // If no method data exists, go to profile_continue.
1351 test_method_data_pointer(mdp, profile_continue);
1352
1353 int count_offset = in_bytes(CounterData::count_offset());
1354 // Back up the address, since we have already bumped the mdp.
1355 count_offset -= in_bytes(VirtualCallData::virtual_call_data_size());
1356
1357 // *Decrement* the counter. We expect to see zero or small negatives.
1358 increment_mdp_data_at(mdp, count_offset, true);
1359
1360 bind (profile_continue);
1361 }
1362 }
1363
1364 void InterpreterMacroAssembler::profile_typecheck(Register mdp, Register klass, Register reg2) {
1365 if (ProfileInterpreter) {
1366 Label profile_continue;
1367
1368 // If no method data exists, go to profile_continue.
1369 test_method_data_pointer(mdp, profile_continue);
1370
1371 // The method data pointer needs to be updated.
1372 int mdp_delta = in_bytes(BitData::bit_data_size());
1373 if (TypeProfileCasts) {
1374 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());
1375
1376 // Record the object type.
1377 record_klass_in_profile(klass, mdp, reg2, false);
1378 }
1379 update_mdp_by_constant(mdp, mdp_delta);
1380
1381 bind(profile_continue);
1382 }
1383 }
1384
1385 void InterpreterMacroAssembler::profile_switch_default(Register mdp) {
1386 if (ProfileInterpreter) {
1387 Label profile_continue;
1388
1389 // If no method data exists, go to profile_continue.
1390 test_method_data_pointer(mdp, profile_continue);
1391
1392 // Update the default case count
1393 increment_mdp_data_at(mdp,
1394 in_bytes(MultiBranchData::default_count_offset()));
1395
1396 // The method data pointer needs to be updated.
1397 update_mdp_by_offset(mdp,
1398 in_bytes(MultiBranchData::
1399 default_displacement_offset()));
1400
1401 bind(profile_continue);
1402 }
1403 }
1404
1405 void InterpreterMacroAssembler::profile_switch_case(Register index,
1406 Register mdp,
1407 Register reg2) {
1408 if (ProfileInterpreter) {
1409 Label profile_continue;
1410
1411 // If no method data exists, go to profile_continue.
1412 test_method_data_pointer(mdp, profile_continue);
1413
1414 // Build the base (index * per_case_size_in_bytes()) +
1415 // case_array_offset_in_bytes()
1416 movw(reg2, in_bytes(MultiBranchData::per_case_size()));
1417 movw(rscratch1, in_bytes(MultiBranchData::case_array_offset()));
1418 Assembler::maddw(index, index, reg2, rscratch1);
1419
1420 // Update the case count
1421 increment_mdp_data_at(mdp,
1422 index,
1423 in_bytes(MultiBranchData::relative_count_offset()));
1424
1425 // The method data pointer needs to be updated.
1426 update_mdp_by_offset(mdp,
1427 index,
1428 in_bytes(MultiBranchData::
1429 relative_displacement_offset()));
1430
1431 bind(profile_continue);
1432 }
1433 }
1434
1435 void InterpreterMacroAssembler::verify_oop(Register reg, TosState state) {
1436 if (state == atos) {
1437 MacroAssembler::verify_oop(reg);
1438 }
1439 }
1440
1441 void InterpreterMacroAssembler::verify_FPU(int stack_depth, TosState state) { ; }
1442
1443
1444 void InterpreterMacroAssembler::notify_method_entry() {
1445 // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to
1446 // track stack depth. If it is possible to enter interp_only_mode we add
1447 // the code to check if the event should be sent.
1448 if (JvmtiExport::can_post_interpreter_events()) {
1449 Label L;
1450 ldrw(r3, Address(rthread, JavaThread::interp_only_mode_offset()));
1451 cbzw(r3, L);
1452 call_VM(noreg, CAST_FROM_FN_PTR(address,
1453 InterpreterRuntime::post_method_entry));
1454 bind(L);
1455 }
1456
1457 {
1458 SkipIfEqual skip(this, &DTraceMethodProbes, false);
1459 get_method(c_rarg1);
1460 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry),
1461 rthread, c_rarg1);
1462 }
1463
1464 // RedefineClasses() tracing support for obsolete method entry
1465 if (log_is_enabled(Trace, redefine, class, obsolete)) {
1466 get_method(c_rarg1);
1467 call_VM_leaf(
1468 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry),
1469 rthread, c_rarg1);
1470 }
1471
1472 }
1473
1474
1475 void InterpreterMacroAssembler::notify_method_exit(
1476 TosState state, NotifyMethodExitMode mode) {
1477 // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to
1478 // track stack depth. If it is possible to enter interp_only_mode we add
1479 // the code to check if the event should be sent.
1480 if (mode == NotifyJVMTI && JvmtiExport::can_post_interpreter_events()) {
1481 Label L;
1482 // Note: frame::interpreter_frame_result has a dependency on how the
1483 // method result is saved across the call to post_method_exit. If this
1484 // is changed then the interpreter_frame_result implementation will
1485 // need to be updated too.
1486
1487 // template interpreter will leave the result on the top of the stack.
1488 push(state);
1489 ldrw(r3, Address(rthread, JavaThread::interp_only_mode_offset()));
1490 cbz(r3, L);
1491 call_VM(noreg,
1492 CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit));
1493 bind(L);
1494 pop(state);
1495 }
1496
1497 {
1498 SkipIfEqual skip(this, &DTraceMethodProbes, false);
1499 push(state);
1500 get_method(c_rarg1);
1501 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),
1502 rthread, c_rarg1);
1503 pop(state);
1504 }
1505 }
1506
1507
1508 // Jump if ((*counter_addr += increment) & mask) satisfies the condition.
1509 void InterpreterMacroAssembler::increment_mask_and_jump(Address counter_addr,
1510 int increment, Address mask,
1511 Register scratch, Register scratch2,
1512 bool preloaded, Condition cond,
1513 Label* where) {
1514 if (!preloaded) {
1515 ldrw(scratch, counter_addr);
1516 }
1517 add(scratch, scratch, increment);
1518 strw(scratch, counter_addr);
1519 ldrw(scratch2, mask);
1520 ands(scratch, scratch, scratch2);
1521 br(cond, *where);
1522 }
1523
1524 void InterpreterMacroAssembler::call_VM_leaf_base(address entry_point,
1525 int number_of_arguments) {
1526 // interpreter specific
1527 //
1528 // Note: No need to save/restore rbcp & rlocals pointer since these
1529 // are callee saved registers and no blocking/ GC can happen
1530 // in leaf calls.
1531 #ifdef ASSERT
1532 {
1533 Label L;
1534 ldr(rscratch1, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
1535 cbz(rscratch1, L);
1536 stop("InterpreterMacroAssembler::call_VM_leaf_base:"
1537 " last_sp != NULL");
1538 bind(L);
1539 }
1540 #endif /* ASSERT */
1541 // super call
1542 MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments);
1543 }
1544
1545 void InterpreterMacroAssembler::call_VM_base(Register oop_result,
1546 Register java_thread,
1547 Register last_java_sp,
1548 address entry_point,
1549 int number_of_arguments,
1550 bool check_exceptions) {
1551 // interpreter specific
1552 //
1553 // Note: Could avoid restoring locals ptr (callee saved) - however doesn't
1554 // really make a difference for these runtime calls, since they are
1555 // slow anyway. Btw., bcp must be saved/restored since it may change
1556 // due to GC.
1557 // assert(java_thread == noreg , "not expecting a precomputed java thread");
1558 save_bcp();
1559 #ifdef ASSERT
1560 {
1561 Label L;
1562 ldr(rscratch1, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
1563 cbz(rscratch1, L);
1564 stop("InterpreterMacroAssembler::call_VM_leaf_base:"
1565 " last_sp != NULL");
1566 bind(L);
1567 }
1568 #endif /* ASSERT */
1569 // super call
1570 MacroAssembler::call_VM_base(oop_result, noreg, last_java_sp,
1571 entry_point, number_of_arguments,
1572 check_exceptions);
1573 // interpreter specific
1574 restore_bcp();
1575 restore_locals();
1576 }
1577
1578 void InterpreterMacroAssembler::profile_obj_type(Register obj, const Address& mdo_addr) {
1579 Label update, next, none;
1580
1581 verify_oop(obj);
1582
1583 cbnz(obj, update);
1584 orptr(mdo_addr, TypeEntries::null_seen);
1585 b(next);
1586
1587 bind(update);
1588 load_klass(obj, obj);
1589
1590 ldr(rscratch1, mdo_addr);
1591 eor(obj, obj, rscratch1);
1592 tst(obj, TypeEntries::type_klass_mask);
1593 br(Assembler::EQ, next); // klass seen before, nothing to
1594 // do. The unknown bit may have been
1595 // set already but no need to check.
1596
1597 tbnz(obj, exact_log2(TypeEntries::type_unknown), next);
1598 // already unknown. Nothing to do anymore.
1599
1600 ldr(rscratch1, mdo_addr);
1601 cbz(rscratch1, none);
1602 cmp(rscratch1, TypeEntries::null_seen);
1603 br(Assembler::EQ, none);
1604 // There is a chance that the checks above (re-reading profiling
1605 // data from memory) fail if another thread has just set the
1606 // profiling to this obj's klass
1607 ldr(rscratch1, mdo_addr);
1608 eor(obj, obj, rscratch1);
1609 tst(obj, TypeEntries::type_klass_mask);
1610 br(Assembler::EQ, next);
1611
1612 // different than before. Cannot keep accurate profile.
1613 orptr(mdo_addr, TypeEntries::type_unknown);
1614 b(next);
1615
1616 bind(none);
1617 // first time here. Set profile type.
1618 str(obj, mdo_addr);
1619
1620 bind(next);
1621 }
1622
1623 void InterpreterMacroAssembler::profile_arguments_type(Register mdp, Register callee, Register tmp, bool is_virtual) {
1624 if (!ProfileInterpreter) {
1625 return;
1626 }
1627
1628 if (MethodData::profile_arguments() || MethodData::profile_return()) {
1629 Label profile_continue;
1630
1631 test_method_data_pointer(mdp, profile_continue);
1632
1633 int off_to_start = is_virtual ? in_bytes(VirtualCallData::virtual_call_data_size()) : in_bytes(CounterData::counter_data_size());
1634
1635 ldrb(rscratch1, Address(mdp, in_bytes(DataLayout::tag_offset()) - off_to_start));
1636 cmp(rscratch1, is_virtual ? DataLayout::virtual_call_type_data_tag : DataLayout::call_type_data_tag);
1637 br(Assembler::NE, profile_continue);
1638
1639 if (MethodData::profile_arguments()) {
1640 Label done;
1641 int off_to_args = in_bytes(TypeEntriesAtCall::args_data_offset());
1642
1643 for (int i = 0; i < TypeProfileArgsLimit; i++) {
1644 if (i > 0 || MethodData::profile_return()) {
1645 // If return value type is profiled we may have no argument to profile
1646 ldr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset())));
1647 sub(tmp, tmp, i*TypeStackSlotEntries::per_arg_count());
1648 cmp(tmp, TypeStackSlotEntries::per_arg_count());
1649 add(rscratch1, mdp, off_to_args);
1650 br(Assembler::LT, done);
1651 }
1652 ldr(tmp, Address(callee, Method::const_offset()));
1653 load_unsigned_short(tmp, Address(tmp, ConstMethod::size_of_parameters_offset()));
1654 // stack offset o (zero based) from the start of the argument
1655 // list, for n arguments translates into offset n - o - 1 from
1656 // the end of the argument list
1657 ldr(rscratch1, Address(mdp, in_bytes(TypeEntriesAtCall::stack_slot_offset(i))));
1658 sub(tmp, tmp, rscratch1);
1659 sub(tmp, tmp, 1);
1660 Address arg_addr = argument_address(tmp);
1661 ldr(tmp, arg_addr);
1662
1663 Address mdo_arg_addr(mdp, in_bytes(TypeEntriesAtCall::argument_type_offset(i)));
1664 profile_obj_type(tmp, mdo_arg_addr);
1665
1666 int to_add = in_bytes(TypeStackSlotEntries::per_arg_size());
1667 off_to_args += to_add;
1668 }
1669
1670 if (MethodData::profile_return()) {
1671 ldr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset())));
1672 sub(tmp, tmp, TypeProfileArgsLimit*TypeStackSlotEntries::per_arg_count());
1673 }
1674
1675 add(rscratch1, mdp, off_to_args);
1676 bind(done);
1677 mov(mdp, rscratch1);
1678
1679 if (MethodData::profile_return()) {
1680 // We're right after the type profile for the last
1681 // argument. tmp is the number of cells left in the
1682 // CallTypeData/VirtualCallTypeData to reach its end. Non null
1683 // if there's a return to profile.
1684 assert(ReturnTypeEntry::static_cell_count() < TypeStackSlotEntries::per_arg_count(), "can't move past ret type");
1685 add(mdp, mdp, tmp, LSL, exact_log2(DataLayout::cell_size));
1686 }
1687 str(mdp, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize));
1688 } else {
1689 assert(MethodData::profile_return(), "either profile call args or call ret");
1690 update_mdp_by_constant(mdp, in_bytes(TypeEntriesAtCall::return_only_size()));
1691 }
1692
1693 // mdp points right after the end of the
1694 // CallTypeData/VirtualCallTypeData, right after the cells for the
1695 // return value type if there's one
1696
1697 bind(profile_continue);
1698 }
1699 }
1700
1701 void InterpreterMacroAssembler::profile_return_type(Register mdp, Register ret, Register tmp) {
1702 assert_different_registers(mdp, ret, tmp, rbcp);
1703 if (ProfileInterpreter && MethodData::profile_return()) {
1704 Label profile_continue, done;
1705
1706 test_method_data_pointer(mdp, profile_continue);
1707
1708 if (MethodData::profile_return_jsr292_only()) {
1709 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
1710
1711 // If we don't profile all invoke bytecodes we must make sure
1712 // it's a bytecode we indeed profile. We can't go back to the
1713 // begining of the ProfileData we intend to update to check its
1714 // type because we're right after it and we don't known its
1715 // length
1716 Label do_profile;
1717 ldrb(rscratch1, Address(rbcp, 0));
1718 cmp(rscratch1, Bytecodes::_invokedynamic);
1719 br(Assembler::EQ, do_profile);
1720 cmp(rscratch1, Bytecodes::_invokehandle);
1721 br(Assembler::EQ, do_profile);
1722 get_method(tmp);
1723 ldrh(rscratch1, Address(tmp, Method::intrinsic_id_offset_in_bytes()));
1724 cmp(rscratch1, vmIntrinsics::_compiledLambdaForm);
1725 br(Assembler::NE, profile_continue);
1726
1727 bind(do_profile);
1728 }
1729
1730 Address mdo_ret_addr(mdp, -in_bytes(ReturnTypeEntry::size()));
1731 mov(tmp, ret);
1732 profile_obj_type(tmp, mdo_ret_addr);
1733
1734 bind(profile_continue);
1735 }
1736 }
1737
1738 void InterpreterMacroAssembler::profile_parameters_type(Register mdp, Register tmp1, Register tmp2) {
1739 if (ProfileInterpreter && MethodData::profile_parameters()) {
1740 Label profile_continue, done;
1741
1742 test_method_data_pointer(mdp, profile_continue);
1743
1744 // Load the offset of the area within the MDO used for
1745 // parameters. If it's negative we're not profiling any parameters
1746 ldr(tmp1, Address(mdp, in_bytes(MethodData::parameters_type_data_di_offset()) - in_bytes(MethodData::data_offset())));
1747 cmp(tmp1, 0u);
1748 br(Assembler::LT, profile_continue);
1749
1750 // Compute a pointer to the area for parameters from the offset
1751 // and move the pointer to the slot for the last
1752 // parameters. Collect profiling from last parameter down.
1753 // mdo start + parameters offset + array length - 1
1754 add(mdp, mdp, tmp1);
1755 ldr(tmp1, Address(mdp, ArrayData::array_len_offset()));
1756 sub(tmp1, tmp1, TypeStackSlotEntries::per_arg_count());
1757
1758 Label loop;
1759 bind(loop);
1760
1761 int off_base = in_bytes(ParametersTypeData::stack_slot_offset(0));
1762 int type_base = in_bytes(ParametersTypeData::type_offset(0));
1763 int per_arg_scale = exact_log2(DataLayout::cell_size);
1764 add(rscratch1, mdp, off_base);
1765 add(rscratch2, mdp, type_base);
1766
1767 Address arg_off(rscratch1, tmp1, Address::lsl(per_arg_scale));
1768 Address arg_type(rscratch2, tmp1, Address::lsl(per_arg_scale));
1769
1770 // load offset on the stack from the slot for this parameter
1771 ldr(tmp2, arg_off);
1772 neg(tmp2, tmp2);
1773 // read the parameter from the local area
1774 ldr(tmp2, Address(rlocals, tmp2, Address::lsl(Interpreter::logStackElementSize)));
1775
1776 // profile the parameter
1777 profile_obj_type(tmp2, arg_type);
1778
1779 // go to next parameter
1780 subs(tmp1, tmp1, TypeStackSlotEntries::per_arg_count());
1781 br(Assembler::GE, loop);
1782
1783 bind(profile_continue);
1784 }
1785 }