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