1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_templateInterpreter.cpp.incl"
27
28 #ifndef CC_INTERP
29
30 # define __ _masm->
31
32 void TemplateInterpreter::initialize() {
33 if (_code != NULL) return;
34 // assertions
35 assert((int)Bytecodes::number_of_codes <= (int)DispatchTable::length,
36 "dispatch table too small");
37
38 AbstractInterpreter::initialize();
39
40 TemplateTable::initialize();
41
42 // generate interpreter
43 { ResourceMark rm;
44 TraceTime timer("Interpreter generation", TraceStartupTime);
45 int code_size = InterpreterCodeSize;
46 NOT_PRODUCT(code_size *= 4;) // debug uses extra interpreter code space
47 _code = new StubQueue(new InterpreterCodeletInterface, code_size, NULL,
48 "Interpreter");
49 InterpreterGenerator g(_code);
50 if (PrintInterpreter) print();
51 }
52
53 // initialize dispatch table
54 _active_table = _normal_table;
55 }
56
57 //------------------------------------------------------------------------------------------------------------------------
58 // Implementation of EntryPoint
59
60 EntryPoint::EntryPoint() {
61 assert(number_of_states == 9, "check the code below");
62 _entry[btos] = NULL;
63 _entry[ctos] = NULL;
64 _entry[stos] = NULL;
65 _entry[atos] = NULL;
66 _entry[itos] = NULL;
67 _entry[ltos] = NULL;
68 _entry[ftos] = NULL;
69 _entry[dtos] = NULL;
70 _entry[vtos] = NULL;
71 }
72
73
74 EntryPoint::EntryPoint(address bentry, address centry, address sentry, address aentry, address ientry, address lentry, address fentry, address dentry, address ventry) {
75 assert(number_of_states == 9, "check the code below");
76 _entry[btos] = bentry;
77 _entry[ctos] = centry;
78 _entry[stos] = sentry;
79 _entry[atos] = aentry;
80 _entry[itos] = ientry;
81 _entry[ltos] = lentry;
82 _entry[ftos] = fentry;
83 _entry[dtos] = dentry;
84 _entry[vtos] = ventry;
85 }
86
87
88 void EntryPoint::set_entry(TosState state, address entry) {
89 assert(0 <= state && state < number_of_states, "state out of bounds");
90 _entry[state] = entry;
91 }
92
93
94 address EntryPoint::entry(TosState state) const {
95 assert(0 <= state && state < number_of_states, "state out of bounds");
96 return _entry[state];
97 }
98
99
100 void EntryPoint::print() {
101 tty->print("[");
102 for (int i = 0; i < number_of_states; i++) {
103 if (i > 0) tty->print(", ");
104 tty->print(INTPTR_FORMAT, _entry[i]);
105 }
106 tty->print("]");
107 }
108
109
110 bool EntryPoint::operator == (const EntryPoint& y) {
111 int i = number_of_states;
112 while (i-- > 0) {
113 if (_entry[i] != y._entry[i]) return false;
114 }
115 return true;
116 }
117
118
119 //------------------------------------------------------------------------------------------------------------------------
120 // Implementation of DispatchTable
121
122 EntryPoint DispatchTable::entry(int i) const {
123 assert(0 <= i && i < length, "index out of bounds");
124 return
125 EntryPoint(
126 _table[btos][i],
127 _table[ctos][i],
128 _table[stos][i],
129 _table[atos][i],
130 _table[itos][i],
131 _table[ltos][i],
132 _table[ftos][i],
133 _table[dtos][i],
134 _table[vtos][i]
135 );
136 }
137
138
139 void DispatchTable::set_entry(int i, EntryPoint& entry) {
140 assert(0 <= i && i < length, "index out of bounds");
141 assert(number_of_states == 9, "check the code below");
142 _table[btos][i] = entry.entry(btos);
143 _table[ctos][i] = entry.entry(ctos);
144 _table[stos][i] = entry.entry(stos);
145 _table[atos][i] = entry.entry(atos);
146 _table[itos][i] = entry.entry(itos);
147 _table[ltos][i] = entry.entry(ltos);
148 _table[ftos][i] = entry.entry(ftos);
149 _table[dtos][i] = entry.entry(dtos);
150 _table[vtos][i] = entry.entry(vtos);
151 }
152
153
154 bool DispatchTable::operator == (DispatchTable& y) {
155 int i = length;
156 while (i-- > 0) {
157 EntryPoint t = y.entry(i); // for compiler compatibility (BugId 4150096)
158 if (!(entry(i) == t)) return false;
159 }
160 return true;
161 }
162
163 address TemplateInterpreter::_remove_activation_entry = NULL;
164 address TemplateInterpreter::_remove_activation_preserving_args_entry = NULL;
165
166
167 address TemplateInterpreter::_throw_ArrayIndexOutOfBoundsException_entry = NULL;
168 address TemplateInterpreter::_throw_ArrayStoreException_entry = NULL;
169 address TemplateInterpreter::_throw_ArithmeticException_entry = NULL;
170 address TemplateInterpreter::_throw_ClassCastException_entry = NULL;
171 address TemplateInterpreter::_throw_WrongMethodType_entry = NULL;
172 address TemplateInterpreter::_throw_NullPointerException_entry = NULL;
173 address TemplateInterpreter::_throw_StackOverflowError_entry = NULL;
174 address TemplateInterpreter::_throw_exception_entry = NULL;
175
176 #ifndef PRODUCT
177 EntryPoint TemplateInterpreter::_trace_code;
178 #endif // !PRODUCT
179 EntryPoint TemplateInterpreter::_return_entry[TemplateInterpreter::number_of_return_entries];
180 EntryPoint TemplateInterpreter::_earlyret_entry;
181 EntryPoint TemplateInterpreter::_deopt_entry [TemplateInterpreter::number_of_deopt_entries ];
182 EntryPoint TemplateInterpreter::_continuation_entry;
183 EntryPoint TemplateInterpreter::_safept_entry;
184
185 address TemplateInterpreter::_return_3_addrs_by_index[TemplateInterpreter::number_of_return_addrs];
186 address TemplateInterpreter::_return_5_addrs_by_index[TemplateInterpreter::number_of_return_addrs];
187
188 DispatchTable TemplateInterpreter::_active_table;
189 DispatchTable TemplateInterpreter::_normal_table;
190 DispatchTable TemplateInterpreter::_safept_table;
191 address TemplateInterpreter::_wentry_point[DispatchTable::length];
192
193 TemplateInterpreterGenerator::TemplateInterpreterGenerator(StubQueue* _code): AbstractInterpreterGenerator(_code) {
194 _unimplemented_bytecode = NULL;
195 _illegal_bytecode_sequence = NULL;
196 }
197
198 static const BasicType types[Interpreter::number_of_result_handlers] = {
199 T_BOOLEAN,
200 T_CHAR ,
201 T_BYTE ,
202 T_SHORT ,
203 T_INT ,
204 T_LONG ,
205 T_VOID ,
206 T_FLOAT ,
207 T_DOUBLE ,
208 T_OBJECT
209 };
210
211 void TemplateInterpreterGenerator::generate_all() {
212 AbstractInterpreterGenerator::generate_all();
213
214 { CodeletMark cm(_masm, "error exits");
215 _unimplemented_bytecode = generate_error_exit("unimplemented bytecode");
216 _illegal_bytecode_sequence = generate_error_exit("illegal bytecode sequence - method not verified");
217 }
218
219 #ifndef PRODUCT
220 if (TraceBytecodes) {
221 CodeletMark cm(_masm, "bytecode tracing support");
222 Interpreter::_trace_code =
223 EntryPoint(
224 generate_trace_code(btos),
225 generate_trace_code(ctos),
226 generate_trace_code(stos),
227 generate_trace_code(atos),
228 generate_trace_code(itos),
229 generate_trace_code(ltos),
230 generate_trace_code(ftos),
231 generate_trace_code(dtos),
232 generate_trace_code(vtos)
233 );
234 }
235 #endif // !PRODUCT
236
237 { CodeletMark cm(_masm, "return entry points");
238 for (int i = 0; i < Interpreter::number_of_return_entries; i++) {
239 Interpreter::_return_entry[i] =
240 EntryPoint(
241 generate_return_entry_for(itos, i),
242 generate_return_entry_for(itos, i),
243 generate_return_entry_for(itos, i),
244 generate_return_entry_for(atos, i),
245 generate_return_entry_for(itos, i),
246 generate_return_entry_for(ltos, i),
247 generate_return_entry_for(ftos, i),
248 generate_return_entry_for(dtos, i),
249 generate_return_entry_for(vtos, i)
250 );
251 }
252 }
253
254 { CodeletMark cm(_masm, "earlyret entry points");
255 Interpreter::_earlyret_entry =
256 EntryPoint(
257 generate_earlyret_entry_for(btos),
258 generate_earlyret_entry_for(ctos),
259 generate_earlyret_entry_for(stos),
260 generate_earlyret_entry_for(atos),
261 generate_earlyret_entry_for(itos),
262 generate_earlyret_entry_for(ltos),
263 generate_earlyret_entry_for(ftos),
264 generate_earlyret_entry_for(dtos),
265 generate_earlyret_entry_for(vtos)
266 );
267 }
268
269 { CodeletMark cm(_masm, "deoptimization entry points");
270 for (int i = 0; i < Interpreter::number_of_deopt_entries; i++) {
271 Interpreter::_deopt_entry[i] =
272 EntryPoint(
273 generate_deopt_entry_for(itos, i),
274 generate_deopt_entry_for(itos, i),
275 generate_deopt_entry_for(itos, i),
276 generate_deopt_entry_for(atos, i),
277 generate_deopt_entry_for(itos, i),
278 generate_deopt_entry_for(ltos, i),
279 generate_deopt_entry_for(ftos, i),
280 generate_deopt_entry_for(dtos, i),
281 generate_deopt_entry_for(vtos, i)
282 );
283 }
284 }
285
286 { CodeletMark cm(_masm, "result handlers for native calls");
287 // The various result converter stublets.
288 int is_generated[Interpreter::number_of_result_handlers];
289 memset(is_generated, 0, sizeof(is_generated));
290
291 for (int i = 0; i < Interpreter::number_of_result_handlers; i++) {
292 BasicType type = types[i];
293 if (!is_generated[Interpreter::BasicType_as_index(type)]++) {
294 Interpreter::_native_abi_to_tosca[Interpreter::BasicType_as_index(type)] = generate_result_handler_for(type);
295 }
296 }
297 }
298
299 for (int j = 0; j < number_of_states; j++) {
300 const TosState states[] = {btos, ctos, stos, itos, ltos, ftos, dtos, atos, vtos};
301 int index = Interpreter::TosState_as_index(states[j]);
302 Interpreter::_return_3_addrs_by_index[index] = Interpreter::return_entry(states[j], 3);
303 Interpreter::_return_5_addrs_by_index[index] = Interpreter::return_entry(states[j], 5);
304 }
305
306 { CodeletMark cm(_masm, "continuation entry points");
307 Interpreter::_continuation_entry =
308 EntryPoint(
309 generate_continuation_for(btos),
310 generate_continuation_for(ctos),
311 generate_continuation_for(stos),
312 generate_continuation_for(atos),
313 generate_continuation_for(itos),
314 generate_continuation_for(ltos),
315 generate_continuation_for(ftos),
316 generate_continuation_for(dtos),
317 generate_continuation_for(vtos)
318 );
319 }
320
321 { CodeletMark cm(_masm, "safepoint entry points");
322 Interpreter::_safept_entry =
323 EntryPoint(
324 generate_safept_entry_for(btos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
325 generate_safept_entry_for(ctos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
326 generate_safept_entry_for(stos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
327 generate_safept_entry_for(atos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
328 generate_safept_entry_for(itos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
329 generate_safept_entry_for(ltos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
330 generate_safept_entry_for(ftos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
331 generate_safept_entry_for(dtos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
332 generate_safept_entry_for(vtos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint))
333 );
334 }
335
336 { CodeletMark cm(_masm, "exception handling");
337 // (Note: this is not safepoint safe because thread may return to compiled code)
338 generate_throw_exception();
339 }
340
341 { CodeletMark cm(_masm, "throw exception entrypoints");
342 Interpreter::_throw_ArrayIndexOutOfBoundsException_entry = generate_ArrayIndexOutOfBounds_handler("java/lang/ArrayIndexOutOfBoundsException");
343 Interpreter::_throw_ArrayStoreException_entry = generate_klass_exception_handler("java/lang/ArrayStoreException" );
344 Interpreter::_throw_ArithmeticException_entry = generate_exception_handler("java/lang/ArithmeticException" , "/ by zero");
345 Interpreter::_throw_ClassCastException_entry = generate_ClassCastException_handler();
346 Interpreter::_throw_WrongMethodType_entry = generate_WrongMethodType_handler();
347 Interpreter::_throw_NullPointerException_entry = generate_exception_handler("java/lang/NullPointerException" , NULL );
348 Interpreter::_throw_StackOverflowError_entry = generate_StackOverflowError_handler();
349 }
350
351
352
353 #define method_entry(kind) \
354 { CodeletMark cm(_masm, "method entry point (kind = " #kind ")"); \
355 Interpreter::_entry_table[Interpreter::kind] = generate_method_entry(Interpreter::kind); \
356 }
357
358 // all non-native method kinds
359 method_entry(zerolocals)
360 method_entry(zerolocals_synchronized)
361 method_entry(empty)
362 method_entry(accessor)
363 method_entry(abstract)
364 method_entry(method_handle)
365 method_entry(java_lang_math_sin )
366 method_entry(java_lang_math_cos )
367 method_entry(java_lang_math_tan )
368 method_entry(java_lang_math_abs )
369 method_entry(java_lang_math_sqrt )
370 method_entry(java_lang_math_log )
371 method_entry(java_lang_math_log10)
372
373 // all native method kinds (must be one contiguous block)
374 Interpreter::_native_entry_begin = Interpreter::code()->code_end();
375 method_entry(native)
376 method_entry(native_synchronized)
377 Interpreter::_native_entry_end = Interpreter::code()->code_end();
378
379 #undef method_entry
380
381 // Bytecodes
382 set_entry_points_for_all_bytes();
383 set_safepoints_for_all_bytes();
384 }
385
386 //------------------------------------------------------------------------------------------------------------------------
387
388 address TemplateInterpreterGenerator::generate_error_exit(const char* msg) {
389 address entry = __ pc();
390 __ stop(msg);
391 return entry;
392 }
393
394
395 //------------------------------------------------------------------------------------------------------------------------
396
397 void TemplateInterpreterGenerator::set_entry_points_for_all_bytes() {
398 for (int i = 0; i < DispatchTable::length; i++) {
399 Bytecodes::Code code = (Bytecodes::Code)i;
400 if (Bytecodes::is_defined(code)) {
401 set_entry_points(code);
402 } else {
403 set_unimplemented(i);
404 }
405 }
406 }
407
408
409 void TemplateInterpreterGenerator::set_safepoints_for_all_bytes() {
410 for (int i = 0; i < DispatchTable::length; i++) {
411 Bytecodes::Code code = (Bytecodes::Code)i;
412 if (Bytecodes::is_defined(code)) Interpreter::_safept_table.set_entry(code, Interpreter::_safept_entry);
413 }
414 }
415
416
417 void TemplateInterpreterGenerator::set_unimplemented(int i) {
418 address e = _unimplemented_bytecode;
419 EntryPoint entry(e, e, e, e, e, e, e, e, e);
420 Interpreter::_normal_table.set_entry(i, entry);
421 Interpreter::_wentry_point[i] = _unimplemented_bytecode;
422 }
423
424
425 void TemplateInterpreterGenerator::set_entry_points(Bytecodes::Code code) {
426 CodeletMark cm(_masm, Bytecodes::name(code), code);
427 // initialize entry points
428 assert(_unimplemented_bytecode != NULL, "should have been generated before");
429 assert(_illegal_bytecode_sequence != NULL, "should have been generated before");
430 address bep = _illegal_bytecode_sequence;
431 address cep = _illegal_bytecode_sequence;
432 address sep = _illegal_bytecode_sequence;
433 address aep = _illegal_bytecode_sequence;
434 address iep = _illegal_bytecode_sequence;
435 address lep = _illegal_bytecode_sequence;
436 address fep = _illegal_bytecode_sequence;
437 address dep = _illegal_bytecode_sequence;
438 address vep = _unimplemented_bytecode;
439 address wep = _unimplemented_bytecode;
440 // code for short & wide version of bytecode
441 if (Bytecodes::is_defined(code)) {
442 Template* t = TemplateTable::template_for(code);
443 assert(t->is_valid(), "just checking");
444 set_short_entry_points(t, bep, cep, sep, aep, iep, lep, fep, dep, vep);
445 }
446 if (Bytecodes::wide_is_defined(code)) {
447 Template* t = TemplateTable::template_for_wide(code);
448 assert(t->is_valid(), "just checking");
449 set_wide_entry_point(t, wep);
450 }
451 // set entry points
452 EntryPoint entry(bep, cep, sep, aep, iep, lep, fep, dep, vep);
453 Interpreter::_normal_table.set_entry(code, entry);
454 Interpreter::_wentry_point[code] = wep;
455 }
456
457
458 void TemplateInterpreterGenerator::set_wide_entry_point(Template* t, address& wep) {
459 assert(t->is_valid(), "template must exist");
460 assert(t->tos_in() == vtos, "only vtos tos_in supported for wide instructions")
461 wep = __ pc(); generate_and_dispatch(t);
462 }
463
464
465 void TemplateInterpreterGenerator::set_short_entry_points(Template* t, address& bep, address& cep, address& sep, address& aep, address& iep, address& lep, address& fep, address& dep, address& vep) {
466 assert(t->is_valid(), "template must exist");
467 switch (t->tos_in()) {
468 case btos:
469 case ctos:
470 case stos:
471 ShouldNotReachHere(); // btos/ctos/stos should use itos.
472 break;
473 case atos: vep = __ pc(); __ pop(atos); aep = __ pc(); generate_and_dispatch(t); break;
474 case itos: vep = __ pc(); __ pop(itos); iep = __ pc(); generate_and_dispatch(t); break;
475 case ltos: vep = __ pc(); __ pop(ltos); lep = __ pc(); generate_and_dispatch(t); break;
476 case ftos: vep = __ pc(); __ pop(ftos); fep = __ pc(); generate_and_dispatch(t); break;
477 case dtos: vep = __ pc(); __ pop(dtos); dep = __ pc(); generate_and_dispatch(t); break;
478 case vtos: set_vtos_entry_points(t, bep, cep, sep, aep, iep, lep, fep, dep, vep); break;
479 default : ShouldNotReachHere(); break;
480 }
481 }
482
483
484 //------------------------------------------------------------------------------------------------------------------------
485
486 void TemplateInterpreterGenerator::generate_and_dispatch(Template* t, TosState tos_out) {
487 if (PrintBytecodeHistogram) histogram_bytecode(t);
488 #ifndef PRODUCT
489 // debugging code
490 if (CountBytecodes || TraceBytecodes || StopInterpreterAt > 0) count_bytecode();
491 if (PrintBytecodePairHistogram) histogram_bytecode_pair(t);
492 if (TraceBytecodes) trace_bytecode(t);
493 if (StopInterpreterAt > 0) stop_interpreter_at();
494 __ verify_FPU(1, t->tos_in());
495 #endif // !PRODUCT
496 int step;
497 if (!t->does_dispatch()) {
498 step = t->is_wide() ? Bytecodes::wide_length_for(t->bytecode()) : Bytecodes::length_for(t->bytecode());
499 if (tos_out == ilgl) tos_out = t->tos_out();
500 // compute bytecode size
501 assert(step > 0, "just checkin'");
502 // setup stuff for dispatching next bytecode
503 if (ProfileInterpreter && VerifyDataPointer
504 && methodDataOopDesc::bytecode_has_profile(t->bytecode())) {
505 __ verify_method_data_pointer();
506 }
507 __ dispatch_prolog(tos_out, step);
508 }
509 // generate template
510 t->generate(_masm);
511 // advance
512 if (t->does_dispatch()) {
513 #ifdef ASSERT
514 // make sure execution doesn't go beyond this point if code is broken
515 __ should_not_reach_here();
516 #endif // ASSERT
517 } else {
518 // dispatch to next bytecode
519 __ dispatch_epilog(tos_out, step);
520 }
521 }
522
523 //------------------------------------------------------------------------------------------------------------------------
524 // Entry points
525
526 address TemplateInterpreter::return_entry(TosState state, int length) {
527 guarantee(0 <= length && length < Interpreter::number_of_return_entries, "illegal length");
528 return _return_entry[length].entry(state);
529 }
530
531
532 address TemplateInterpreter::deopt_entry(TosState state, int length) {
533 guarantee(0 <= length && length < Interpreter::number_of_deopt_entries, "illegal length");
534 return _deopt_entry[length].entry(state);
535 }
536
537 //------------------------------------------------------------------------------------------------------------------------
538 // Suport for invokes
539
540 int TemplateInterpreter::TosState_as_index(TosState state) {
541 assert( state < number_of_states , "Invalid state in TosState_as_index");
542 assert(0 <= (int)state && (int)state < TemplateInterpreter::number_of_return_addrs, "index out of bounds");
543 return (int)state;
544 }
545
546
547 //------------------------------------------------------------------------------------------------------------------------
548 // Safepoint suppport
549
550 static inline void copy_table(address* from, address* to, int size) {
551 // Copy non-overlapping tables. The copy has to occur word wise for MT safety.
552 while (size-- > 0) *to++ = *from++;
553 }
554
555 void TemplateInterpreter::notice_safepoints() {
556 if (!_notice_safepoints) {
557 // switch to safepoint dispatch table
558 _notice_safepoints = true;
559 copy_table((address*)&_safept_table, (address*)&_active_table, sizeof(_active_table) / sizeof(address));
560 }
561 }
562
563 // switch from the dispatch table which notices safepoints back to the
564 // normal dispatch table. So that we can notice single stepping points,
565 // keep the safepoint dispatch table if we are single stepping in JVMTI.
566 // Note that the should_post_single_step test is exactly as fast as the
567 // JvmtiExport::_enabled test and covers both cases.
568 void TemplateInterpreter::ignore_safepoints() {
569 if (_notice_safepoints) {
570 if (!JvmtiExport::should_post_single_step()) {
571 // switch to normal dispatch table
572 _notice_safepoints = false;
573 copy_table((address*)&_normal_table, (address*)&_active_table, sizeof(_active_table) / sizeof(address));
574 }
575 }
576 }
577
578 //------------------------------------------------------------------------------------------------------------------------
579 // Deoptimization support
580
581 // If deoptimization happens, this function returns the point of next bytecode to continue execution
582 address TemplateInterpreter::deopt_continue_after_entry(methodOop method, address bcp, int callee_parameters, bool is_top_frame) {
583 return AbstractInterpreter::deopt_continue_after_entry(method, bcp, callee_parameters, is_top_frame);
584 }
585
586 // If deoptimization happens, this function returns the point where the interpreter reexecutes
587 // the bytecode.
588 // Note: Bytecodes::_athrow (C1 only) and Bytecodes::_return are the special cases
589 // that do not return "Interpreter::deopt_entry(vtos, 0)"
590 address TemplateInterpreter::deopt_reexecute_entry(methodOop method, address bcp) {
591 assert(method->contains(bcp), "just checkin'");
592 Bytecodes::Code code = Bytecodes::java_code_at(bcp);
593 if (code == Bytecodes::_return) {
594 // This is used for deopt during registration of finalizers
595 // during Object.<init>. We simply need to resume execution at
596 // the standard return vtos bytecode to pop the frame normally.
597 // reexecuting the real bytecode would cause double registration
598 // of the finalizable object.
599 return _normal_table.entry(Bytecodes::_return).entry(vtos);
600 } else {
601 return AbstractInterpreter::deopt_reexecute_entry(method, bcp);
602 }
603 }
604
605 // If deoptimization happens, the interpreter should reexecute this bytecode.
606 // This function mainly helps the compilers to set up the reexecute bit.
607 bool TemplateInterpreter::bytecode_should_reexecute(Bytecodes::Code code) {
608 if (code == Bytecodes::_return) {
609 //Yes, we consider Bytecodes::_return as a special case of reexecution
610 return true;
611 } else {
612 return AbstractInterpreter::bytecode_should_reexecute(code);
613 }
614 }
615
616 #endif // !CC_INTERP