1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "interpreter/interpreter.hpp"
27 #include "interpreter/interpreterGenerator.hpp"
28 #include "interpreter/interpreterRuntime.hpp"
29 #include "interpreter/templateTable.hpp"
30
31 #ifndef CC_INTERP
32
33 # define __ _masm->
34
35 void TemplateInterpreter::initialize() {
36 if (_code != NULL) return;
37 // assertions
38 assert((int)Bytecodes::number_of_codes <= (int)DispatchTable::length,
39 "dispatch table too small");
40
41 AbstractInterpreter::initialize();
42
43 TemplateTable::initialize();
44
45 // generate interpreter
46 { ResourceMark rm;
47 TraceTime timer("Interpreter generation", TraceStartupTime);
48 int code_size = InterpreterCodeSize;
49 NOT_PRODUCT(code_size *= 4;) // debug uses extra interpreter code space
50 _code = new StubQueue(new InterpreterCodeletInterface, code_size, NULL,
51 "Interpreter");
52 InterpreterGenerator g(_code);
53 if (PrintInterpreter) print();
54 }
55
56 // initialize dispatch table
57 _active_table = _normal_table;
58 }
59
60 //------------------------------------------------------------------------------------------------------------------------
61 // Implementation of EntryPoint
62
63 EntryPoint::EntryPoint() {
64 assert(number_of_states == 9, "check the code below");
65 _entry[btos] = NULL;
66 _entry[ctos] = NULL;
67 _entry[stos] = NULL;
68 _entry[atos] = NULL;
69 _entry[itos] = NULL;
70 _entry[ltos] = NULL;
71 _entry[ftos] = NULL;
72 _entry[dtos] = NULL;
73 _entry[vtos] = NULL;
74 }
75
76
77 EntryPoint::EntryPoint(address bentry, address centry, address sentry, address aentry, address ientry, address lentry, address fentry, address dentry, address ventry) {
78 assert(number_of_states == 9, "check the code below");
79 _entry[btos] = bentry;
80 _entry[ctos] = centry;
81 _entry[stos] = sentry;
82 _entry[atos] = aentry;
83 _entry[itos] = ientry;
84 _entry[ltos] = lentry;
85 _entry[ftos] = fentry;
86 _entry[dtos] = dentry;
87 _entry[vtos] = ventry;
88 }
89
90
91 void EntryPoint::set_entry(TosState state, address entry) {
92 assert(0 <= state && state < number_of_states, "state out of bounds");
93 _entry[state] = entry;
94 }
95
96
97 address EntryPoint::entry(TosState state) const {
98 assert(0 <= state && state < number_of_states, "state out of bounds");
99 return _entry[state];
100 }
101
102
103 void EntryPoint::print() {
104 tty->print("[");
105 for (int i = 0; i < number_of_states; i++) {
106 if (i > 0) tty->print(", ");
107 tty->print(INTPTR_FORMAT, _entry[i]);
108 }
109 tty->print("]");
110 }
111
112
113 bool EntryPoint::operator == (const EntryPoint& y) {
114 int i = number_of_states;
115 while (i-- > 0) {
116 if (_entry[i] != y._entry[i]) return false;
117 }
118 return true;
119 }
120
121
122 //------------------------------------------------------------------------------------------------------------------------
123 // Implementation of DispatchTable
124
125 EntryPoint DispatchTable::entry(int i) const {
126 assert(0 <= i && i < length, "index out of bounds");
127 return
128 EntryPoint(
129 _table[btos][i],
130 _table[ctos][i],
131 _table[stos][i],
132 _table[atos][i],
133 _table[itos][i],
134 _table[ltos][i],
135 _table[ftos][i],
136 _table[dtos][i],
137 _table[vtos][i]
138 );
139 }
140
141
142 void DispatchTable::set_entry(int i, EntryPoint& entry) {
143 assert(0 <= i && i < length, "index out of bounds");
144 assert(number_of_states == 9, "check the code below");
145 _table[btos][i] = entry.entry(btos);
146 _table[ctos][i] = entry.entry(ctos);
147 _table[stos][i] = entry.entry(stos);
148 _table[atos][i] = entry.entry(atos);
149 _table[itos][i] = entry.entry(itos);
150 _table[ltos][i] = entry.entry(ltos);
151 _table[ftos][i] = entry.entry(ftos);
152 _table[dtos][i] = entry.entry(dtos);
153 _table[vtos][i] = entry.entry(vtos);
154 }
155
156
157 bool DispatchTable::operator == (DispatchTable& y) {
158 int i = length;
159 while (i-- > 0) {
160 EntryPoint t = y.entry(i); // for compiler compatibility (BugId 4150096)
161 if (!(entry(i) == t)) return false;
162 }
163 return true;
164 }
165
166 address TemplateInterpreter::_remove_activation_entry = NULL;
167 address TemplateInterpreter::_remove_activation_preserving_args_entry = NULL;
168
169
170 address TemplateInterpreter::_throw_ArrayIndexOutOfBoundsException_entry = NULL;
171 address TemplateInterpreter::_throw_ArrayStoreException_entry = NULL;
172 address TemplateInterpreter::_throw_ArithmeticException_entry = NULL;
173 address TemplateInterpreter::_throw_ClassCastException_entry = NULL;
174 address TemplateInterpreter::_throw_NullPointerException_entry = NULL;
175 address TemplateInterpreter::_throw_StackOverflowError_entry = NULL;
176 address TemplateInterpreter::_throw_exception_entry = NULL;
177
178 #ifndef PRODUCT
179 EntryPoint TemplateInterpreter::_trace_code;
180 #endif // !PRODUCT
181 EntryPoint TemplateInterpreter::_return_entry[TemplateInterpreter::number_of_return_entries];
182 EntryPoint TemplateInterpreter::_earlyret_entry;
183 EntryPoint TemplateInterpreter::_deopt_entry [TemplateInterpreter::number_of_deopt_entries ];
184 EntryPoint TemplateInterpreter::_continuation_entry;
185 EntryPoint TemplateInterpreter::_safept_entry;
186
187 address TemplateInterpreter::_invoke_return_entry[TemplateInterpreter::number_of_return_addrs];
188 address TemplateInterpreter::_invokeinterface_return_entry[TemplateInterpreter::number_of_return_addrs];
189 address TemplateInterpreter::_invokedynamic_return_entry[TemplateInterpreter::number_of_return_addrs];
190
191 DispatchTable TemplateInterpreter::_active_table;
192 DispatchTable TemplateInterpreter::_normal_table;
193 DispatchTable TemplateInterpreter::_safept_table;
194 address TemplateInterpreter::_wentry_point[DispatchTable::length];
195
196 TemplateInterpreterGenerator::TemplateInterpreterGenerator(StubQueue* _code): AbstractInterpreterGenerator(_code) {
197 _unimplemented_bytecode = NULL;
198 _illegal_bytecode_sequence = NULL;
199 }
200
201 static const BasicType types[Interpreter::number_of_result_handlers] = {
202 T_BOOLEAN,
203 T_CHAR ,
204 T_BYTE ,
205 T_SHORT ,
206 T_INT ,
207 T_LONG ,
208 T_VOID ,
209 T_FLOAT ,
210 T_DOUBLE ,
211 T_OBJECT
212 };
213
214 void TemplateInterpreterGenerator::generate_all() {
215 AbstractInterpreterGenerator::generate_all();
216
217 { CodeletMark cm(_masm, "error exits");
218 _unimplemented_bytecode = generate_error_exit("unimplemented bytecode");
219 _illegal_bytecode_sequence = generate_error_exit("illegal bytecode sequence - method not verified");
220 }
221
222 #ifndef PRODUCT
223 if (TraceBytecodes) {
224 CodeletMark cm(_masm, "bytecode tracing support");
225 Interpreter::_trace_code =
226 EntryPoint(
227 generate_trace_code(btos),
228 generate_trace_code(ctos),
229 generate_trace_code(stos),
230 generate_trace_code(atos),
231 generate_trace_code(itos),
232 generate_trace_code(ltos),
233 generate_trace_code(ftos),
234 generate_trace_code(dtos),
235 generate_trace_code(vtos)
236 );
237 }
238 #endif // !PRODUCT
239
240 { CodeletMark cm(_masm, "return entry points");
241 const int index_size = sizeof(u2);
242 for (int i = 0; i < Interpreter::number_of_return_entries; i++) {
243 Interpreter::_return_entry[i] =
244 EntryPoint(
245 generate_return_entry_for(itos, i, index_size),
246 generate_return_entry_for(itos, i, index_size),
247 generate_return_entry_for(itos, i, index_size),
248 generate_return_entry_for(atos, i, index_size),
249 generate_return_entry_for(itos, i, index_size),
250 generate_return_entry_for(ltos, i, index_size),
251 generate_return_entry_for(ftos, i, index_size),
252 generate_return_entry_for(dtos, i, index_size),
253 generate_return_entry_for(vtos, i, index_size)
254 );
255 }
256 }
257
258 { CodeletMark cm(_masm, "invoke return entry points");
259 const TosState states[] = {itos, itos, itos, itos, ltos, ftos, dtos, atos, vtos};
260 const int invoke_length = Bytecodes::length_for(Bytecodes::_invokestatic);
261 const int invokeinterface_length = Bytecodes::length_for(Bytecodes::_invokeinterface);
262 const int invokedynamic_length = Bytecodes::length_for(Bytecodes::_invokedynamic);
263
264 for (int i = 0; i < Interpreter::number_of_return_addrs; i++) {
265 TosState state = states[i];
266 Interpreter::_invoke_return_entry[i] = generate_return_entry_for(state, invoke_length, sizeof(u2));
267 Interpreter::_invokeinterface_return_entry[i] = generate_return_entry_for(state, invokeinterface_length, sizeof(u2));
268 Interpreter::_invokedynamic_return_entry[i] = generate_return_entry_for(state, invokedynamic_length, sizeof(u4));
269 }
270 }
271
272 { CodeletMark cm(_masm, "earlyret entry points");
273 Interpreter::_earlyret_entry =
274 EntryPoint(
275 generate_earlyret_entry_for(btos),
276 generate_earlyret_entry_for(ctos),
277 generate_earlyret_entry_for(stos),
278 generate_earlyret_entry_for(atos),
279 generate_earlyret_entry_for(itos),
280 generate_earlyret_entry_for(ltos),
281 generate_earlyret_entry_for(ftos),
282 generate_earlyret_entry_for(dtos),
283 generate_earlyret_entry_for(vtos)
284 );
285 }
286
287 { CodeletMark cm(_masm, "deoptimization entry points");
288 for (int i = 0; i < Interpreter::number_of_deopt_entries; i++) {
289 Interpreter::_deopt_entry[i] =
290 EntryPoint(
291 generate_deopt_entry_for(itos, i),
292 generate_deopt_entry_for(itos, i),
293 generate_deopt_entry_for(itos, i),
294 generate_deopt_entry_for(atos, i),
295 generate_deopt_entry_for(itos, i),
296 generate_deopt_entry_for(ltos, i),
297 generate_deopt_entry_for(ftos, i),
298 generate_deopt_entry_for(dtos, i),
299 generate_deopt_entry_for(vtos, i)
300 );
301 }
302 }
303
304 { CodeletMark cm(_masm, "result handlers for native calls");
305 // The various result converter stublets.
306 int is_generated[Interpreter::number_of_result_handlers];
307 memset(is_generated, 0, sizeof(is_generated));
308
309 for (int i = 0; i < Interpreter::number_of_result_handlers; i++) {
310 BasicType type = types[i];
311 if (!is_generated[Interpreter::BasicType_as_index(type)]++) {
312 Interpreter::_native_abi_to_tosca[Interpreter::BasicType_as_index(type)] = generate_result_handler_for(type);
313 }
314 }
315 }
316
317 { CodeletMark cm(_masm, "continuation entry points");
318 Interpreter::_continuation_entry =
319 EntryPoint(
320 generate_continuation_for(btos),
321 generate_continuation_for(ctos),
322 generate_continuation_for(stos),
323 generate_continuation_for(atos),
324 generate_continuation_for(itos),
325 generate_continuation_for(ltos),
326 generate_continuation_for(ftos),
327 generate_continuation_for(dtos),
328 generate_continuation_for(vtos)
329 );
330 }
331
332 { CodeletMark cm(_masm, "safepoint entry points");
333 Interpreter::_safept_entry =
334 EntryPoint(
335 generate_safept_entry_for(btos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
336 generate_safept_entry_for(ctos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
337 generate_safept_entry_for(stos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
338 generate_safept_entry_for(atos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
339 generate_safept_entry_for(itos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
340 generate_safept_entry_for(ltos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
341 generate_safept_entry_for(ftos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
342 generate_safept_entry_for(dtos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
343 generate_safept_entry_for(vtos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint))
344 );
345 }
346
347 { CodeletMark cm(_masm, "exception handling");
348 // (Note: this is not safepoint safe because thread may return to compiled code)
349 generate_throw_exception();
350 }
351
352 { CodeletMark cm(_masm, "throw exception entrypoints");
353 Interpreter::_throw_ArrayIndexOutOfBoundsException_entry = generate_ArrayIndexOutOfBounds_handler("java/lang/ArrayIndexOutOfBoundsException");
354 Interpreter::_throw_ArrayStoreException_entry = generate_klass_exception_handler("java/lang/ArrayStoreException" );
355 Interpreter::_throw_ArithmeticException_entry = generate_exception_handler("java/lang/ArithmeticException" , "/ by zero");
356 Interpreter::_throw_ClassCastException_entry = generate_ClassCastException_handler();
357 Interpreter::_throw_NullPointerException_entry = generate_exception_handler("java/lang/NullPointerException" , NULL );
358 Interpreter::_throw_StackOverflowError_entry = generate_StackOverflowError_handler();
359 }
360
361
362
363 #define method_entry(kind) \
364 { CodeletMark cm(_masm, "method entry point (kind = " #kind ")"); \
365 Interpreter::_entry_table[Interpreter::kind] = generate_method_entry(Interpreter::kind); \
366 }
367
368 // all non-native method kinds
369 method_entry(zerolocals)
370 method_entry(zerolocals_synchronized)
371 method_entry(empty)
372 method_entry(accessor)
373 method_entry(abstract)
374 method_entry(java_lang_math_sin )
375 method_entry(java_lang_math_cos )
376 method_entry(java_lang_math_tan )
377 method_entry(java_lang_math_abs )
378 method_entry(java_lang_math_sqrt )
379 method_entry(java_lang_math_log )
380 method_entry(java_lang_math_log10)
381 method_entry(java_lang_math_exp )
382 method_entry(java_lang_math_pow )
383 method_entry(java_lang_ref_reference_get)
384
385 if (UseCRC32Intrinsics) {
386 method_entry(java_util_zip_CRC32_update)
387 method_entry(java_util_zip_CRC32_updateBytes)
388 method_entry(java_util_zip_CRC32_updateByteBuffer)
389 }
390
391 initialize_method_handle_entries();
392
393 // all native method kinds (must be one contiguous block)
394 Interpreter::_native_entry_begin = Interpreter::code()->code_end();
395 method_entry(native)
396 method_entry(native_synchronized)
397 Interpreter::_native_entry_end = Interpreter::code()->code_end();
398
399 #undef method_entry
400
401 // Bytecodes
402 set_entry_points_for_all_bytes();
403 set_safepoints_for_all_bytes();
404 }
405
406 //------------------------------------------------------------------------------------------------------------------------
407
408 address TemplateInterpreterGenerator::generate_error_exit(const char* msg) {
409 address entry = __ pc();
410 __ stop(msg);
411 return entry;
412 }
413
414
415 //------------------------------------------------------------------------------------------------------------------------
416
417 void TemplateInterpreterGenerator::set_entry_points_for_all_bytes() {
418 for (int i = 0; i < DispatchTable::length; i++) {
419 Bytecodes::Code code = (Bytecodes::Code)i;
420 if (Bytecodes::is_defined(code)) {
421 set_entry_points(code);
422 } else {
423 set_unimplemented(i);
424 }
425 }
426 }
427
428
429 void TemplateInterpreterGenerator::set_safepoints_for_all_bytes() {
430 for (int i = 0; i < DispatchTable::length; i++) {
431 Bytecodes::Code code = (Bytecodes::Code)i;
432 if (Bytecodes::is_defined(code)) Interpreter::_safept_table.set_entry(code, Interpreter::_safept_entry);
433 }
434 }
435
436
437 void TemplateInterpreterGenerator::set_unimplemented(int i) {
438 address e = _unimplemented_bytecode;
439 EntryPoint entry(e, e, e, e, e, e, e, e, e);
440 Interpreter::_normal_table.set_entry(i, entry);
441 Interpreter::_wentry_point[i] = _unimplemented_bytecode;
442 }
443
444
445 void TemplateInterpreterGenerator::set_entry_points(Bytecodes::Code code) {
446 CodeletMark cm(_masm, Bytecodes::name(code), code);
447 // initialize entry points
448 assert(_unimplemented_bytecode != NULL, "should have been generated before");
449 assert(_illegal_bytecode_sequence != NULL, "should have been generated before");
450 address bep = _illegal_bytecode_sequence;
451 address cep = _illegal_bytecode_sequence;
452 address sep = _illegal_bytecode_sequence;
453 address aep = _illegal_bytecode_sequence;
454 address iep = _illegal_bytecode_sequence;
455 address lep = _illegal_bytecode_sequence;
456 address fep = _illegal_bytecode_sequence;
457 address dep = _illegal_bytecode_sequence;
458 address vep = _unimplemented_bytecode;
459 address wep = _unimplemented_bytecode;
460 // code for short & wide version of bytecode
461 if (Bytecodes::is_defined(code)) {
462 Template* t = TemplateTable::template_for(code);
463 assert(t->is_valid(), "just checking");
464 set_short_entry_points(t, bep, cep, sep, aep, iep, lep, fep, dep, vep);
465 }
466 if (Bytecodes::wide_is_defined(code)) {
467 Template* t = TemplateTable::template_for_wide(code);
468 assert(t->is_valid(), "just checking");
469 set_wide_entry_point(t, wep);
470 }
471 // set entry points
472 EntryPoint entry(bep, cep, sep, aep, iep, lep, fep, dep, vep);
473 Interpreter::_normal_table.set_entry(code, entry);
474 Interpreter::_wentry_point[code] = wep;
475 }
476
477
478 void TemplateInterpreterGenerator::set_wide_entry_point(Template* t, address& wep) {
479 assert(t->is_valid(), "template must exist");
480 assert(t->tos_in() == vtos, "only vtos tos_in supported for wide instructions");
481 wep = __ pc(); generate_and_dispatch(t);
482 }
483
484
485 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) {
486 assert(t->is_valid(), "template must exist");
487 switch (t->tos_in()) {
488 case btos:
489 case ctos:
490 case stos:
491 ShouldNotReachHere(); // btos/ctos/stos should use itos.
492 break;
493 case atos: vep = __ pc(); __ pop(atos); aep = __ pc(); generate_and_dispatch(t); break;
494 case itos: vep = __ pc(); __ pop(itos); iep = __ pc(); generate_and_dispatch(t); break;
495 case ltos: vep = __ pc(); __ pop(ltos); lep = __ pc(); generate_and_dispatch(t); break;
496 case ftos: vep = __ pc(); __ pop(ftos); fep = __ pc(); generate_and_dispatch(t); break;
497 case dtos: vep = __ pc(); __ pop(dtos); dep = __ pc(); generate_and_dispatch(t); break;
498 case vtos: set_vtos_entry_points(t, bep, cep, sep, aep, iep, lep, fep, dep, vep); break;
499 default : ShouldNotReachHere(); break;
500 }
501 }
502
503
504 //------------------------------------------------------------------------------------------------------------------------
505
506 void TemplateInterpreterGenerator::generate_and_dispatch(Template* t, TosState tos_out) {
507 if (PrintBytecodeHistogram) histogram_bytecode(t);
508 #ifndef PRODUCT
509 // debugging code
510 if (CountBytecodes || TraceBytecodes || StopInterpreterAt > 0) count_bytecode();
511 if (PrintBytecodePairHistogram) histogram_bytecode_pair(t);
512 if (TraceBytecodes) trace_bytecode(t);
513 if (StopInterpreterAt > 0) stop_interpreter_at();
514 __ verify_FPU(1, t->tos_in());
515 #endif // !PRODUCT
516 int step;
517 if (!t->does_dispatch()) {
518 step = t->is_wide() ? Bytecodes::wide_length_for(t->bytecode()) : Bytecodes::length_for(t->bytecode());
519 if (tos_out == ilgl) tos_out = t->tos_out();
520 // compute bytecode size
521 assert(step > 0, "just checkin'");
522 // setup stuff for dispatching next bytecode
523 if (ProfileInterpreter && VerifyDataPointer
524 && MethodData::bytecode_has_profile(t->bytecode())) {
525 __ verify_method_data_pointer();
526 }
527 __ dispatch_prolog(tos_out, step);
528 }
529 // generate template
530 t->generate(_masm);
531 // advance
532 if (t->does_dispatch()) {
533 #ifdef ASSERT
534 // make sure execution doesn't go beyond this point if code is broken
535 __ should_not_reach_here();
536 #endif // ASSERT
537 } else {
538 // dispatch to next bytecode
539 __ dispatch_epilog(tos_out, step);
540 }
541 }
542
543 //------------------------------------------------------------------------------------------------------------------------
544 // Entry points
545
546 /**
547 * Returns the return entry table for the given invoke bytecode.
548 */
549 address* TemplateInterpreter::invoke_return_entry_table_for(Bytecodes::Code code) {
550 switch (code) {
551 case Bytecodes::_invokestatic:
552 case Bytecodes::_invokespecial:
553 case Bytecodes::_invokevirtual:
554 case Bytecodes::_invokehandle:
555 return Interpreter::invoke_return_entry_table();
556 case Bytecodes::_invokeinterface:
557 return Interpreter::invokeinterface_return_entry_table();
558 case Bytecodes::_invokedynamic:
559 return Interpreter::invokedynamic_return_entry_table();
560 default:
561 fatal(err_msg("invalid bytecode: %s", Bytecodes::name(code)));
562 return NULL;
563 }
564 }
565
566 /**
567 * Returns the return entry address for the given top-of-stack state and bytecode.
568 */
569 address TemplateInterpreter::return_entry(TosState state, int length, Bytecodes::Code code) {
570 guarantee(0 <= length && length < Interpreter::number_of_return_entries, "illegal length");
571 const int index = TosState_as_index(state);
572 switch (code) {
573 case Bytecodes::_invokestatic:
574 case Bytecodes::_invokespecial:
575 case Bytecodes::_invokevirtual:
576 return _invoke_return_entry[index];
577 case Bytecodes::_invokeinterface:
578 return _invokeinterface_return_entry[index];
579 case Bytecodes::_invokedynamic:
580 return _invokedynamic_return_entry[index];
581 default:
582 return _return_entry[length].entry(state);
583 }
584 }
585
586
587 address TemplateInterpreter::deopt_entry(TosState state, int length) {
588 guarantee(0 <= length && length < Interpreter::number_of_deopt_entries, "illegal length");
589 return _deopt_entry[length].entry(state);
590 }
591
592 //------------------------------------------------------------------------------------------------------------------------
593 // Suport for invokes
594
595 int TemplateInterpreter::TosState_as_index(TosState state) {
596 assert( state < number_of_states , "Invalid state in TosState_as_index");
597 assert(0 <= (int)state && (int)state < TemplateInterpreter::number_of_return_addrs, "index out of bounds");
598 return (int)state;
599 }
600
601
602 //------------------------------------------------------------------------------------------------------------------------
603 // Safepoint suppport
604
605 static inline void copy_table(address* from, address* to, int size) {
606 // Copy non-overlapping tables. The copy has to occur word wise for MT safety.
607 while (size-- > 0) *to++ = *from++;
608 }
609
610 void TemplateInterpreter::notice_safepoints() {
611 if (!_notice_safepoints) {
612 // switch to safepoint dispatch table
613 _notice_safepoints = true;
614 copy_table((address*)&_safept_table, (address*)&_active_table, sizeof(_active_table) / sizeof(address));
615 }
616 }
617
618 // switch from the dispatch table which notices safepoints back to the
619 // normal dispatch table. So that we can notice single stepping points,
620 // keep the safepoint dispatch table if we are single stepping in JVMTI.
621 // Note that the should_post_single_step test is exactly as fast as the
622 // JvmtiExport::_enabled test and covers both cases.
623 void TemplateInterpreter::ignore_safepoints() {
624 if (_notice_safepoints) {
625 if (!JvmtiExport::should_post_single_step()) {
626 // switch to normal dispatch table
627 _notice_safepoints = false;
628 copy_table((address*)&_normal_table, (address*)&_active_table, sizeof(_active_table) / sizeof(address));
629 }
630 }
631 }
632
633 //------------------------------------------------------------------------------------------------------------------------
634 // Deoptimization support
635
636 // If deoptimization happens, this function returns the point of next bytecode to continue execution
637 address TemplateInterpreter::deopt_continue_after_entry(Method* method, address bcp, int callee_parameters, bool is_top_frame) {
638 return AbstractInterpreter::deopt_continue_after_entry(method, bcp, callee_parameters, is_top_frame);
639 }
640
641 // If deoptimization happens, this function returns the point where the interpreter reexecutes
642 // the bytecode.
643 // Note: Bytecodes::_athrow (C1 only) and Bytecodes::_return are the special cases
644 // that do not return "Interpreter::deopt_entry(vtos, 0)"
645 address TemplateInterpreter::deopt_reexecute_entry(Method* method, address bcp) {
646 assert(method->contains(bcp), "just checkin'");
647 Bytecodes::Code code = Bytecodes::java_code_at(method, bcp);
648 if (code == Bytecodes::_return) {
649 // This is used for deopt during registration of finalizers
650 // during Object.<init>. We simply need to resume execution at
651 // the standard return vtos bytecode to pop the frame normally.
652 // reexecuting the real bytecode would cause double registration
653 // of the finalizable object.
654 return _normal_table.entry(Bytecodes::_return).entry(vtos);
655 } else {
656 return AbstractInterpreter::deopt_reexecute_entry(method, bcp);
657 }
658 }
659
660 // If deoptimization happens, the interpreter should reexecute this bytecode.
661 // This function mainly helps the compilers to set up the reexecute bit.
662 bool TemplateInterpreter::bytecode_should_reexecute(Bytecodes::Code code) {
663 if (code == Bytecodes::_return) {
664 //Yes, we consider Bytecodes::_return as a special case of reexecution
665 return true;
666 } else {
667 return AbstractInterpreter::bytecode_should_reexecute(code);
668 }
669 }
670
671 #endif // !CC_INTERP