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 "classfile/systemDictionary.hpp"
27 #include "code/debugInfoRec.hpp"
28 #include "gc_interface/collectedHeap.inline.hpp"
29 #include "interpreter/bytecodeStream.hpp"
30 #include "interpreter/bytecodeTracer.hpp"
31 #include "interpreter/bytecodes.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "interpreter/oopMapCache.hpp"
34 #include "memory/gcLocker.hpp"
35 #include "memory/generation.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "oops/klassOop.hpp"
38 #include "oops/methodDataOop.hpp"
39 #include "oops/methodOop.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "oops/symbol.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "prims/methodHandles.hpp"
44 #include "prims/nativeLookup.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/compilationPolicy.hpp"
47 #include "runtime/frame.inline.hpp"
48 #include "runtime/handles.inline.hpp"
49 #include "runtime/relocator.hpp"
50 #include "runtime/sharedRuntime.hpp"
51 #include "runtime/signature.hpp"
52 #include "utilities/quickSort.hpp"
53 #include "utilities/xmlstream.hpp"
54
55
56 // Implementation of methodOopDesc
57
58 address methodOopDesc::get_i2c_entry() {
59 assert(_adapter != NULL, "must have");
60 return _adapter->get_i2c_entry();
61 }
62
63 address methodOopDesc::get_c2i_entry() {
64 assert(_adapter != NULL, "must have");
65 return _adapter->get_c2i_entry();
66 }
67
68 address methodOopDesc::get_c2i_unverified_entry() {
69 assert(_adapter != NULL, "must have");
70 return _adapter->get_c2i_unverified_entry();
71 }
72
73 char* methodOopDesc::name_and_sig_as_C_string() const {
74 return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature());
75 }
76
77 char* methodOopDesc::name_and_sig_as_C_string(char* buf, int size) const {
78 return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature(), buf, size);
79 }
80
81 char* methodOopDesc::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
82 const char* klass_name = klass->external_name();
83 int klass_name_len = (int)strlen(klass_name);
84 int method_name_len = method_name->utf8_length();
85 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
86 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
87 strcpy(dest, klass_name);
88 dest[klass_name_len] = '.';
89 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
90 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
91 dest[len] = 0;
92 return dest;
93 }
94
95 char* methodOopDesc::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
96 Symbol* klass_name = klass->name();
97 klass_name->as_klass_external_name(buf, size);
98 int len = (int)strlen(buf);
99
100 if (len < size - 1) {
101 buf[len++] = '.';
102
103 method_name->as_C_string(&(buf[len]), size - len);
104 len = (int)strlen(buf);
105
106 signature->as_C_string(&(buf[len]), size - len);
107 }
108
109 return buf;
110 }
111
112 int methodOopDesc::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) {
113 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
114 // access exception table
115 ExceptionTable table(mh());
116 int length = table.length();
117 // iterate through all entries sequentially
118 constantPoolHandle pool(THREAD, mh->constants());
119 for (int i = 0; i < length; i ++) {
120 //reacquire the table in case a GC happened
121 ExceptionTable table(mh());
122 int beg_bci = table.start_pc(i);
123 int end_bci = table.end_pc(i);
124 assert(beg_bci <= end_bci, "inconsistent exception table");
125 if (beg_bci <= throw_bci && throw_bci < end_bci) {
126 // exception handler bci range covers throw_bci => investigate further
127 int handler_bci = table.handler_pc(i);
128 int klass_index = table.catch_type_index(i);
129 if (klass_index == 0) {
130 return handler_bci;
131 } else if (ex_klass.is_null()) {
132 return handler_bci;
133 } else {
134 // we know the exception class => get the constraint class
135 // this may require loading of the constraint class; if verification
136 // fails or some other exception occurs, return handler_bci
137 klassOop k = pool->klass_at(klass_index, CHECK_(handler_bci));
138 KlassHandle klass = KlassHandle(THREAD, k);
139 assert(klass.not_null(), "klass not loaded");
140 if (ex_klass->is_subtype_of(klass())) {
141 return handler_bci;
142 }
143 }
144 }
145 }
146
147 return -1;
148 }
149
150 void methodOopDesc::mask_for(int bci, InterpreterOopMap* mask) {
151
152 Thread* myThread = Thread::current();
153 methodHandle h_this(myThread, this);
154 #ifdef ASSERT
155 bool has_capability = myThread->is_VM_thread() ||
156 myThread->is_ConcurrentGC_thread() ||
157 myThread->is_GC_task_thread();
158
159 if (!has_capability) {
160 if (!VerifyStack && !VerifyLastFrame) {
161 // verify stack calls this outside VM thread
162 warning("oopmap should only be accessed by the "
163 "VM, GC task or CMS threads (or during debugging)");
164 InterpreterOopMap local_mask;
165 instanceKlass::cast(method_holder())->mask_for(h_this, bci, &local_mask);
166 local_mask.print();
167 }
168 }
169 #endif
170 instanceKlass::cast(method_holder())->mask_for(h_this, bci, mask);
171 return;
172 }
173
174
175 int methodOopDesc::bci_from(address bcp) const {
176 #ifdef ASSERT
177 { ResourceMark rm;
178 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
179 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string()));
180 }
181 #endif
182 return bcp - code_base();
183 }
184
185
186 // Return (int)bcx if it appears to be a valid BCI.
187 // Return bci_from((address)bcx) if it appears to be a valid BCP.
188 // Return -1 otherwise.
189 // Used by profiling code, when invalid data is a possibility.
190 // The caller is responsible for validating the methodOop itself.
191 int methodOopDesc::validate_bci_from_bcx(intptr_t bcx) const {
192 // keep bci as -1 if not a valid bci
193 int bci = -1;
194 if (bcx == 0 || (address)bcx == code_base()) {
195 // code_size() may return 0 and we allow 0 here
196 // the method may be native
197 bci = 0;
198 } else if (frame::is_bci(bcx)) {
199 if (bcx < code_size()) {
200 bci = (int)bcx;
201 }
202 } else if (contains((address)bcx)) {
203 bci = (address)bcx - code_base();
204 }
205 // Assert that if we have dodged any asserts, bci is negative.
206 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
207 return bci;
208 }
209
210 address methodOopDesc::bcp_from(int bci) const {
211 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci");
212 address bcp = code_base() + bci;
213 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
214 return bcp;
215 }
216
217
218 int methodOopDesc::object_size(bool is_native) {
219 // If native, then include pointers for native_function and signature_handler
220 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
221 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
222 return align_object_size(header_size() + extra_words);
223 }
224
225
226 Symbol* methodOopDesc::klass_name() const {
227 klassOop k = method_holder();
228 assert(k->is_klass(), "must be klass");
229 instanceKlass* ik = (instanceKlass*) k->klass_part();
230 return ik->name();
231 }
232
233
234 void methodOopDesc::set_interpreter_kind() {
235 int kind = Interpreter::method_kind(methodOop(this));
236 assert(kind != Interpreter::invalid,
237 "interpreter entry must be valid");
238 set_interpreter_kind(kind);
239 }
240
241
242 // Attempt to return method oop to original state. Clear any pointers
243 // (to objects outside the shared spaces). We won't be able to predict
244 // where they should point in a new JVM. Further initialize some
245 // entries now in order allow them to be write protected later.
246
247 void methodOopDesc::remove_unshareable_info() {
248 unlink_method();
249 set_interpreter_kind();
250 }
251
252
253 bool methodOopDesc::was_executed_more_than(int n) {
254 // Invocation counter is reset when the methodOop is compiled.
255 // If the method has compiled code we therefore assume it has
256 // be excuted more than n times.
257 if (is_accessor() || is_empty_method() || (code() != NULL)) {
258 // interpreter doesn't bump invocation counter of trivial methods
259 // compiler does not bump invocation counter of compiled methods
260 return true;
261 }
262 else if (_invocation_counter.carry() || (method_data() != NULL && method_data()->invocation_counter()->carry())) {
263 // The carry bit is set when the counter overflows and causes
264 // a compilation to occur. We don't know how many times
265 // the counter has been reset, so we simply assume it has
266 // been executed more than n times.
267 return true;
268 } else {
269 return invocation_count() > n;
270 }
271 }
272
273 #ifndef PRODUCT
274 void methodOopDesc::print_invocation_count() {
275 if (is_static()) tty->print("static ");
276 if (is_final()) tty->print("final ");
277 if (is_synchronized()) tty->print("synchronized ");
278 if (is_native()) tty->print("native ");
279 method_holder()->klass_part()->name()->print_symbol_on(tty);
280 tty->print(".");
281 name()->print_symbol_on(tty);
282 signature()->print_symbol_on(tty);
283
284 if (WizardMode) {
285 // dump the size of the byte codes
286 tty->print(" {%d}", code_size());
287 }
288 tty->cr();
289
290 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
291 tty->print_cr (" invocation_counter: %8d ", invocation_count());
292 tty->print_cr (" backedge_counter: %8d ", backedge_count());
293 if (CountCompiledCalls) {
294 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
295 }
296
297 }
298 #endif
299
300 // Build a methodDataOop object to hold information about this method
301 // collected in the interpreter.
302 void methodOopDesc::build_interpreter_method_data(methodHandle method, TRAPS) {
303 // Do not profile method if current thread holds the pending list lock,
304 // which avoids deadlock for acquiring the MethodData_lock.
305 if (instanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
306 return;
307 }
308
309 // Grab a lock here to prevent multiple
310 // methodDataOops from being created.
311 MutexLocker ml(MethodData_lock, THREAD);
312 if (method->method_data() == NULL) {
313 methodDataOop method_data = oopFactory::new_methodData(method, CHECK);
314 method->set_method_data(method_data);
315 if (PrintMethodData && (Verbose || WizardMode)) {
316 ResourceMark rm(THREAD);
317 tty->print("build_interpreter_method_data for ");
318 method->print_name(tty);
319 tty->cr();
320 // At the end of the run, the MDO, full of data, will be dumped.
321 }
322 }
323 }
324
325 void methodOopDesc::cleanup_inline_caches() {
326 // The current system doesn't use inline caches in the interpreter
327 // => nothing to do (keep this method around for future use)
328 }
329
330
331 int methodOopDesc::extra_stack_words() {
332 // not an inline function, to avoid a header dependency on Interpreter
333 return extra_stack_entries() * Interpreter::stackElementSize;
334 }
335
336
337 void methodOopDesc::compute_size_of_parameters(Thread *thread) {
338 ArgumentSizeComputer asc(signature());
339 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
340 }
341
342 #ifdef CC_INTERP
343 void methodOopDesc::set_result_index(BasicType type) {
344 _result_index = Interpreter::BasicType_as_index(type);
345 }
346 #endif
347
348 BasicType methodOopDesc::result_type() const {
349 ResultTypeFinder rtf(signature());
350 return rtf.type();
351 }
352
353
354 bool methodOopDesc::is_empty_method() const {
355 return code_size() == 1
356 && *code_base() == Bytecodes::_return;
357 }
358
359
360 bool methodOopDesc::is_vanilla_constructor() const {
361 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
362 // which only calls the superclass vanilla constructor and possibly does stores of
363 // zero constants to local fields:
364 //
365 // aload_0
366 // invokespecial
367 // indexbyte1
368 // indexbyte2
369 //
370 // followed by an (optional) sequence of:
371 //
372 // aload_0
373 // aconst_null / iconst_0 / fconst_0 / dconst_0
374 // putfield
375 // indexbyte1
376 // indexbyte2
377 //
378 // followed by:
379 //
380 // return
381
382 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
383 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
384 int size = code_size();
385 // Check if size match
386 if (size == 0 || size % 5 != 0) return false;
387 address cb = code_base();
388 int last = size - 1;
389 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
390 // Does not call superclass default constructor
391 return false;
392 }
393 // Check optional sequence
394 for (int i = 4; i < last; i += 5) {
395 if (cb[i] != Bytecodes::_aload_0) return false;
396 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
397 if (cb[i+2] != Bytecodes::_putfield) return false;
398 }
399 return true;
400 }
401
402
403 bool methodOopDesc::compute_has_loops_flag() {
404 BytecodeStream bcs(methodOop(this));
405 Bytecodes::Code bc;
406
407 while ((bc = bcs.next()) >= 0) {
408 switch( bc ) {
409 case Bytecodes::_ifeq:
410 case Bytecodes::_ifnull:
411 case Bytecodes::_iflt:
412 case Bytecodes::_ifle:
413 case Bytecodes::_ifne:
414 case Bytecodes::_ifnonnull:
415 case Bytecodes::_ifgt:
416 case Bytecodes::_ifge:
417 case Bytecodes::_if_icmpeq:
418 case Bytecodes::_if_icmpne:
419 case Bytecodes::_if_icmplt:
420 case Bytecodes::_if_icmpgt:
421 case Bytecodes::_if_icmple:
422 case Bytecodes::_if_icmpge:
423 case Bytecodes::_if_acmpeq:
424 case Bytecodes::_if_acmpne:
425 case Bytecodes::_goto:
426 case Bytecodes::_jsr:
427 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
428 break;
429
430 case Bytecodes::_goto_w:
431 case Bytecodes::_jsr_w:
432 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
433 break;
434 }
435 }
436 _access_flags.set_loops_flag_init();
437 return _access_flags.has_loops();
438 }
439
440
441 bool methodOopDesc::is_final_method() const {
442 // %%% Should return true for private methods also,
443 // since there is no way to override them.
444 return is_final() || Klass::cast(method_holder())->is_final();
445 }
446
447
448 bool methodOopDesc::is_strict_method() const {
449 return is_strict();
450 }
451
452
453 bool methodOopDesc::can_be_statically_bound() const {
454 if (is_final_method()) return true;
455 return vtable_index() == nonvirtual_vtable_index;
456 }
457
458
459 bool methodOopDesc::is_accessor() const {
460 if (code_size() != 5) return false;
461 if (size_of_parameters() != 1) return false;
462 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
463 if (java_code_at(1) != Bytecodes::_getfield) return false;
464 if (java_code_at(4) != Bytecodes::_areturn &&
465 java_code_at(4) != Bytecodes::_ireturn ) return false;
466 return true;
467 }
468
469
470 bool methodOopDesc::is_initializer() const {
471 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
472 }
473
474 bool methodOopDesc::has_valid_initializer_flags() const {
475 return (is_static() ||
476 instanceKlass::cast(method_holder())->major_version() < 51);
477 }
478
479 bool methodOopDesc::is_static_initializer() const {
480 // For classfiles version 51 or greater, ensure that the clinit method is
481 // static. Non-static methods with the name "<clinit>" are not static
482 // initializers. (older classfiles exempted for backward compatibility)
483 return name() == vmSymbols::class_initializer_name() &&
484 has_valid_initializer_flags();
485 }
486
487
488 objArrayHandle methodOopDesc::resolved_checked_exceptions_impl(methodOop this_oop, TRAPS) {
489 int length = this_oop->checked_exceptions_length();
490 if (length == 0) { // common case
491 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
492 } else {
493 methodHandle h_this(THREAD, this_oop);
494 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
495 objArrayHandle mirrors (THREAD, m_oop);
496 for (int i = 0; i < length; i++) {
497 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
498 klassOop k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
499 assert(Klass::cast(k)->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
500 mirrors->obj_at_put(i, Klass::cast(k)->java_mirror());
501 }
502 return mirrors;
503 }
504 };
505
506
507 int methodOopDesc::line_number_from_bci(int bci) const {
508 if (bci == SynchronizationEntryBCI) bci = 0;
509 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
510 int best_bci = 0;
511 int best_line = -1;
512
513 if (has_linenumber_table()) {
514 // The line numbers are a short array of 2-tuples [start_pc, line_number].
515 // Not necessarily sorted and not necessarily one-to-one.
516 CompressedLineNumberReadStream stream(compressed_linenumber_table());
517 while (stream.read_pair()) {
518 if (stream.bci() == bci) {
519 // perfect match
520 return stream.line();
521 } else {
522 // update best_bci/line
523 if (stream.bci() < bci && stream.bci() >= best_bci) {
524 best_bci = stream.bci();
525 best_line = stream.line();
526 }
527 }
528 }
529 }
530 return best_line;
531 }
532
533
534 bool methodOopDesc::is_klass_loaded_by_klass_index(int klass_index) const {
535 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
536 Thread *thread = Thread::current();
537 Symbol* klass_name = constants()->klass_name_at(klass_index);
538 Handle loader(thread, instanceKlass::cast(method_holder())->class_loader());
539 Handle prot (thread, Klass::cast(method_holder())->protection_domain());
540 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
541 } else {
542 return true;
543 }
544 }
545
546
547 bool methodOopDesc::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
548 int klass_index = constants()->klass_ref_index_at(refinfo_index);
549 if (must_be_resolved) {
550 // Make sure klass is resolved in constantpool.
551 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
552 }
553 return is_klass_loaded_by_klass_index(klass_index);
554 }
555
556
557 void methodOopDesc::set_native_function(address function, bool post_event_flag) {
558 assert(function != NULL, "use clear_native_function to unregister natives");
559 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
560 address* native_function = native_function_addr();
561
562 // We can see racers trying to place the same native function into place. Once
563 // is plenty.
564 address current = *native_function;
565 if (current == function) return;
566 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
567 function != NULL) {
568 // native_method_throw_unsatisfied_link_error_entry() should only
569 // be passed when post_event_flag is false.
570 assert(function !=
571 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
572 "post_event_flag mis-match");
573
574 // post the bind event, and possible change the bind function
575 JvmtiExport::post_native_method_bind(this, &function);
576 }
577 *native_function = function;
578 // This function can be called more than once. We must make sure that we always
579 // use the latest registered method -> check if a stub already has been generated.
580 // If so, we have to make it not_entrant.
581 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
582 if (nm != NULL) {
583 nm->make_not_entrant();
584 }
585 }
586
587
588 bool methodOopDesc::has_native_function() const {
589 if (is_method_handle_intrinsic())
590 return false; // special-cased in SharedRuntime::generate_native_wrapper
591 address func = native_function();
592 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
593 }
594
595
596 void methodOopDesc::clear_native_function() {
597 // Note: is_method_handle_intrinsic() is allowed here.
598 set_native_function(
599 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
600 !native_bind_event_is_interesting);
601 clear_code();
602 }
603
604 address methodOopDesc::critical_native_function() {
605 methodHandle mh(this);
606 return NativeLookup::lookup_critical_entry(mh);
607 }
608
609
610 void methodOopDesc::set_signature_handler(address handler) {
611 address* signature_handler = signature_handler_addr();
612 *signature_handler = handler;
613 }
614
615
616 void methodOopDesc::print_made_not_compilable(int comp_level, bool is_osr, bool report) {
617 if (PrintCompilation && report) {
618 ttyLocker ttyl;
619 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
620 if (comp_level == CompLevel_all) {
621 tty->print("all levels ");
622 } else {
623 tty->print("levels ");
624 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
625 tty->print("%d ", i);
626 }
627 }
628 this->print_short_name(tty);
629 int size = this->code_size();
630 if (size > 0)
631 tty->print(" (%d bytes)", size);
632 tty->cr();
633 }
634 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
635 ttyLocker ttyl;
636 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'",
637 is_osr ? "osr_" : "", os::current_thread_id());
638 xtty->method(methodOop(this));
639 xtty->stamp();
640 xtty->end_elem();
641 }
642 }
643
644 bool methodOopDesc::is_not_compilable(int comp_level) const {
645 if (number_of_breakpoints() > 0)
646 return true;
647 if (is_method_handle_intrinsic())
648 return !is_synthetic(); // the generated adapters must be compiled
649 if (comp_level == CompLevel_any)
650 return is_not_c1_compilable() || is_not_c2_compilable();
651 if (is_c1_compile(comp_level))
652 return is_not_c1_compilable();
653 if (is_c2_compile(comp_level))
654 return is_not_c2_compilable();
655 return false;
656 }
657
658 // call this when compiler finds that this method is not compilable
659 void methodOopDesc::set_not_compilable(int comp_level, bool report) {
660 print_made_not_compilable(comp_level, /*is_osr*/ false, report);
661 if (comp_level == CompLevel_all) {
662 set_not_c1_compilable();
663 set_not_c2_compilable();
664 } else {
665 if (is_c1_compile(comp_level))
666 set_not_c1_compilable();
667 if (is_c2_compile(comp_level))
668 set_not_c2_compilable();
669 }
670 CompilationPolicy::policy()->disable_compilation(this);
671 }
672
673 bool methodOopDesc::is_not_osr_compilable(int comp_level) const {
674 if (is_not_compilable(comp_level))
675 return true;
676 if (comp_level == CompLevel_any)
677 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
678 if (is_c1_compile(comp_level))
679 return is_not_c1_osr_compilable();
680 if (is_c2_compile(comp_level))
681 return is_not_c2_osr_compilable();
682 return false;
683 }
684
685 void methodOopDesc::set_not_osr_compilable(int comp_level, bool report) {
686 print_made_not_compilable(comp_level, /*is_osr*/ true, report);
687 if (comp_level == CompLevel_all) {
688 set_not_c1_osr_compilable();
689 set_not_c2_osr_compilable();
690 } else {
691 if (is_c1_compile(comp_level))
692 set_not_c1_osr_compilable();
693 if (is_c2_compile(comp_level))
694 set_not_c2_osr_compilable();
695 }
696 CompilationPolicy::policy()->disable_compilation(this);
697 }
698
699 // Revert to using the interpreter and clear out the nmethod
700 void methodOopDesc::clear_code() {
701
702 // this may be NULL if c2i adapters have not been made yet
703 // Only should happen at allocate time.
704 if (_adapter == NULL) {
705 _from_compiled_entry = NULL;
706 } else {
707 _from_compiled_entry = _adapter->get_c2i_entry();
708 }
709 OrderAccess::storestore();
710 _from_interpreted_entry = _i2i_entry;
711 OrderAccess::storestore();
712 _code = NULL;
713 }
714
715 // Called by class data sharing to remove any entry points (which are not shared)
716 void methodOopDesc::unlink_method() {
717 _code = NULL;
718 _i2i_entry = NULL;
719 _from_interpreted_entry = NULL;
720 if (is_native()) {
721 *native_function_addr() = NULL;
722 set_signature_handler(NULL);
723 }
724 NOT_PRODUCT(set_compiled_invocation_count(0);)
725 invocation_counter()->reset();
726 backedge_counter()->reset();
727 _adapter = NULL;
728 _from_compiled_entry = NULL;
729 assert(_method_data == NULL, "unexpected method data?");
730 set_method_data(NULL);
731 set_interpreter_throwout_count(0);
732 set_interpreter_invocation_count(0);
733 }
734
735 // Called when the method_holder is getting linked. Setup entrypoints so the method
736 // is ready to be called from interpreter, compiler, and vtables.
737 void methodOopDesc::link_method(methodHandle h_method, TRAPS) {
738 // If the code cache is full, we may reenter this function for the
739 // leftover methods that weren't linked.
740 if (_i2i_entry != NULL) return;
741
742 assert(_adapter == NULL, "init'd to NULL" );
743 assert( _code == NULL, "nothing compiled yet" );
744
745 // Setup interpreter entrypoint
746 assert(this == h_method(), "wrong h_method()" );
747 address entry = Interpreter::entry_for_method(h_method);
748 assert(entry != NULL, "interpreter entry must be non-null");
749 // Sets both _i2i_entry and _from_interpreted_entry
750 set_interpreter_entry(entry);
751 if (is_native() && !is_method_handle_intrinsic()) {
752 set_native_function(
753 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
754 !native_bind_event_is_interesting);
755 }
756
757 // Setup compiler entrypoint. This is made eagerly, so we do not need
758 // special handling of vtables. An alternative is to make adapters more
759 // lazily by calling make_adapter() from from_compiled_entry() for the
760 // normal calls. For vtable calls life gets more complicated. When a
761 // call-site goes mega-morphic we need adapters in all methods which can be
762 // called from the vtable. We need adapters on such methods that get loaded
763 // later. Ditto for mega-morphic itable calls. If this proves to be a
764 // problem we'll make these lazily later.
765 (void) make_adapters(h_method, CHECK);
766
767 // ONLY USE the h_method now as make_adapter may have blocked
768
769 }
770
771 address methodOopDesc::make_adapters(methodHandle mh, TRAPS) {
772 // Adapters for compiled code are made eagerly here. They are fairly
773 // small (generally < 100 bytes) and quick to make (and cached and shared)
774 // so making them eagerly shouldn't be too expensive.
775 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
776 if (adapter == NULL ) {
777 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
778 }
779
780 mh->set_adapter_entry(adapter);
781 mh->_from_compiled_entry = adapter->get_c2i_entry();
782 return adapter->get_c2i_entry();
783 }
784
785 // The verified_code_entry() must be called when a invoke is resolved
786 // on this method.
787
788 // It returns the compiled code entry point, after asserting not null.
789 // This function is called after potential safepoints so that nmethod
790 // or adapter that it points to is still live and valid.
791 // This function must not hit a safepoint!
792 address methodOopDesc::verified_code_entry() {
793 debug_only(No_Safepoint_Verifier nsv;)
794 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
795 if (code == NULL && UseCodeCacheFlushing) {
796 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this);
797 if (saved_code != NULL) {
798 methodHandle method(this);
799 assert( ! saved_code->is_osr_method(), "should not get here for osr" );
800 set_code( method, saved_code );
801 }
802 }
803
804 assert(_from_compiled_entry != NULL, "must be set");
805 return _from_compiled_entry;
806 }
807
808 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
809 // (could be racing a deopt).
810 // Not inline to avoid circular ref.
811 bool methodOopDesc::check_code() const {
812 // cached in a register or local. There's a race on the value of the field.
813 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
814 return code == NULL || (code->method() == NULL) || (code->method() == (methodOop)this && !code->is_osr_method());
815 }
816
817 // Install compiled code. Instantly it can execute.
818 void methodOopDesc::set_code(methodHandle mh, nmethod *code) {
819 assert( code, "use clear_code to remove code" );
820 assert( mh->check_code(), "" );
821
822 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
823
824 // These writes must happen in this order, because the interpreter will
825 // directly jump to from_interpreted_entry which jumps to an i2c adapter
826 // which jumps to _from_compiled_entry.
827 mh->_code = code; // Assign before allowing compiled code to exec
828
829 int comp_level = code->comp_level();
830 // In theory there could be a race here. In practice it is unlikely
831 // and not worth worrying about.
832 if (comp_level > mh->highest_comp_level()) {
833 mh->set_highest_comp_level(comp_level);
834 }
835
836 OrderAccess::storestore();
837 #ifdef SHARK
838 mh->_from_interpreted_entry = code->insts_begin();
839 #else //!SHARK
840 mh->_from_compiled_entry = code->verified_entry_point();
841 OrderAccess::storestore();
842 // Instantly compiled code can execute.
843 if (!mh->is_method_handle_intrinsic())
844 mh->_from_interpreted_entry = mh->get_i2c_entry();
845 #endif //!SHARK
846 }
847
848
849 bool methodOopDesc::is_overridden_in(klassOop k) const {
850 instanceKlass* ik = instanceKlass::cast(k);
851
852 if (ik->is_interface()) return false;
853
854 // If method is an interface, we skip it - except if it
855 // is a miranda method
856 if (instanceKlass::cast(method_holder())->is_interface()) {
857 // Check that method is not a miranda method
858 if (ik->lookup_method(name(), signature()) == NULL) {
859 // No implementation exist - so miranda method
860 return false;
861 }
862 return true;
863 }
864
865 assert(ik->is_subclass_of(method_holder()), "should be subklass");
866 assert(ik->vtable() != NULL, "vtable should exist");
867 if (vtable_index() == nonvirtual_vtable_index) {
868 return false;
869 } else {
870 methodOop vt_m = ik->method_at_vtable(vtable_index());
871 return vt_m != methodOop(this);
872 }
873 }
874
875
876 // give advice about whether this methodOop should be cached or not
877 bool methodOopDesc::should_not_be_cached() const {
878 if (is_old()) {
879 // This method has been redefined. It is either EMCP or obsolete
880 // and we don't want to cache it because that would pin the method
881 // down and prevent it from being collectible if and when it
882 // finishes executing.
883 return true;
884 }
885
886 if (mark()->should_not_be_cached()) {
887 // It is either not safe or not a good idea to cache this
888 // method at this time because of the state of the embedded
889 // markOop. See markOop.cpp for the gory details.
890 return true;
891 }
892
893 // caching this method should be just fine
894 return false;
895 }
896
897 // Constant pool structure for invoke methods:
898 enum {
899 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
900 _imcp_invoke_signature, // utf8: (variable Symbol*)
901 _imcp_limit
902 };
903
904 // Test if this method is an MH adapter frame generated by Java code.
905 // Cf. java/lang/invoke/InvokerBytecodeGenerator
906 bool methodOopDesc::is_compiled_lambda_form() const {
907 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
908 }
909
910 // Test if this method is an internal MH primitive method.
911 bool methodOopDesc::is_method_handle_intrinsic() const {
912 vmIntrinsics::ID iid = intrinsic_id();
913 return (MethodHandles::is_signature_polymorphic(iid) &&
914 MethodHandles::is_signature_polymorphic_intrinsic(iid));
915 }
916
917 bool methodOopDesc::has_member_arg() const {
918 vmIntrinsics::ID iid = intrinsic_id();
919 return (MethodHandles::is_signature_polymorphic(iid) &&
920 MethodHandles::has_member_arg(iid));
921 }
922
923 // Make an instance of a signature-polymorphic internal MH primitive.
924 methodHandle methodOopDesc::make_method_handle_intrinsic(vmIntrinsics::ID iid,
925 Symbol* signature,
926 TRAPS) {
927 ResourceMark rm;
928 methodHandle empty;
929
930 KlassHandle holder = SystemDictionary::MethodHandle_klass();
931 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
932 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
933 if (TraceMethodHandles) {
934 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
935 }
936
937 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
938 name->increment_refcount();
939 signature->increment_refcount();
940
941 int cp_length = _imcp_limit;
942 constantPoolHandle cp;
943 {
944 constantPoolOop cp_oop = oopFactory::new_constantPool(cp_length, IsSafeConc, CHECK_(empty));
945 cp = constantPoolHandle(THREAD, cp_oop);
946 }
947 cp->symbol_at_put(_imcp_invoke_name, name);
948 cp->symbol_at_put(_imcp_invoke_signature, signature);
949 cp->set_preresolution();
950 cp->set_pool_holder(holder());
951
952 // decide on access bits: public or not?
953 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
954 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
955 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
956 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
957
958 methodHandle m;
959 {
960 methodOop m_oop = oopFactory::new_method(0, accessFlags_from(flags_bits),
961 0, 0, 0, 0, IsSafeConc, CHECK_(empty));
962 m = methodHandle(THREAD, m_oop);
963 }
964 m->set_constants(cp());
965 m->set_name_index(_imcp_invoke_name);
966 m->set_signature_index(_imcp_invoke_signature);
967 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
968 assert(m->signature() == signature, "");
969 #ifdef CC_INTERP
970 ResultTypeFinder rtf(signature);
971 m->set_result_index(rtf.type());
972 #endif
973 m->compute_size_of_parameters(THREAD);
974 m->init_intrinsic_id();
975 assert(m->is_method_handle_intrinsic(), "");
976 #ifdef ASSERT
977 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
978 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
979 assert(m->intrinsic_id() == iid, "correctly predicted iid");
980 #endif //ASSERT
981
982 // Finally, set up its entry points.
983 assert(m->can_be_statically_bound(), "");
984 m->set_vtable_index(methodOopDesc::nonvirtual_vtable_index);
985 m->link_method(m, CHECK_(empty));
986
987 if (TraceMethodHandles && (Verbose || WizardMode))
988 m->print_on(tty);
989
990 return m;
991 }
992
993 klassOop methodOopDesc::check_non_bcp_klass(klassOop klass) {
994 if (klass != NULL && Klass::cast(klass)->class_loader() != NULL) {
995 if (Klass::cast(klass)->oop_is_objArray())
996 klass = objArrayKlass::cast(klass)->bottom_klass();
997 return klass;
998 }
999 return NULL;
1000 }
1001
1002
1003 methodHandle methodOopDesc::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1004 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1005 // Code below does not work for native methods - they should never get rewritten anyway
1006 assert(!m->is_native(), "cannot rewrite native methods");
1007 // Allocate new methodOop
1008 AccessFlags flags = m->access_flags();
1009 int checked_exceptions_len = m->checked_exceptions_length();
1010 int localvariable_len = m->localvariable_table_length();
1011 int exception_table_len = m->exception_table_length();
1012 // Allocate newm_oop with the is_conc_safe parameter set
1013 // to IsUnsafeConc to indicate that newm_oop is not yet
1014 // safe for concurrent processing by a GC.
1015 methodOop newm_oop = oopFactory::new_method(new_code_length,
1016 flags,
1017 new_compressed_linenumber_size,
1018 localvariable_len,
1019 exception_table_len,
1020 checked_exceptions_len,
1021 IsUnsafeConc,
1022 CHECK_(methodHandle()));
1023 methodHandle newm (THREAD, newm_oop);
1024 NOT_PRODUCT(int nmsz = newm->is_parsable() ? newm->size() : -1;)
1025 int new_method_size = newm->method_size();
1026 // Create a shallow copy of methodOopDesc part, but be careful to preserve the new constMethodOop
1027 constMethodOop newcm = newm->constMethod();
1028 NOT_PRODUCT(int ncmsz = newcm->is_parsable() ? newcm->size() : -1;)
1029 int new_const_method_size = newm->constMethod()->object_size();
1030
1031 memcpy(newm(), m(), sizeof(methodOopDesc));
1032 // Create shallow copy of constMethodOopDesc, but be careful to preserve the methodOop
1033 // is_conc_safe is set to false because that is the value of
1034 // is_conc_safe initialzied into newcm and the copy should
1035 // not overwrite that value. During the window during which it is
1036 // tagged as unsafe, some extra work could be needed during precleaning
1037 // or concurrent marking but those phases will be correct. Setting and
1038 // resetting is done in preference to a careful copying into newcm to
1039 // avoid having to know the precise layout of a constMethodOop.
1040 m->constMethod()->set_is_conc_safe(oopDesc::IsUnsafeConc);
1041 assert(m->constMethod()->is_parsable(), "Should remain parsable");
1042
1043 // NOTE: this is a reachable object that transiently signals "conc_unsafe"
1044 // However, no allocations are done during this window
1045 // during which it is tagged conc_unsafe, so we are assured that any concurrent
1046 // thread will not wait forever for the object to revert to "conc_safe".
1047 // Further, any such conc_unsafe object will indicate a stable size
1048 // through the transition.
1049 memcpy(newcm, m->constMethod(), sizeof(constMethodOopDesc));
1050 m->constMethod()->set_is_conc_safe(oopDesc::IsSafeConc);
1051 assert(m->constMethod()->is_parsable(), "Should remain parsable");
1052
1053 // Reset correct method/const method, method size, and parameter info
1054 newm->set_constMethod(newcm);
1055 newm->constMethod()->set_code_size(new_code_length);
1056 newm->constMethod()->set_constMethod_size(new_const_method_size);
1057 newm->set_method_size(new_method_size);
1058 assert(newm->code_size() == new_code_length, "check");
1059 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1060 assert(newm->exception_table_length() == exception_table_len, "check");
1061 assert(newm->localvariable_table_length() == localvariable_len, "check");
1062 // Copy new byte codes
1063 memcpy(newm->code_base(), new_code, new_code_length);
1064 // Copy line number table
1065 if (new_compressed_linenumber_size > 0) {
1066 memcpy(newm->compressed_linenumber_table(),
1067 new_compressed_linenumber_table,
1068 new_compressed_linenumber_size);
1069 }
1070 // Copy checked_exceptions
1071 if (checked_exceptions_len > 0) {
1072 memcpy(newm->checked_exceptions_start(),
1073 m->checked_exceptions_start(),
1074 checked_exceptions_len * sizeof(CheckedExceptionElement));
1075 }
1076 // Copy exception table
1077 if (exception_table_len > 0) {
1078 memcpy(newm->exception_table_start(),
1079 m->exception_table_start(),
1080 exception_table_len * sizeof(ExceptionTableElement));
1081 }
1082 // Copy local variable number table
1083 if (localvariable_len > 0) {
1084 memcpy(newm->localvariable_table_start(),
1085 m->localvariable_table_start(),
1086 localvariable_len * sizeof(LocalVariableTableElement));
1087 }
1088
1089 // Only set is_conc_safe to true when changes to newcm are
1090 // complete.
1091 assert(!newm->is_parsable() || nmsz < 0 || newm->size() == nmsz, "newm->size() inconsistency");
1092 assert(!newcm->is_parsable() || ncmsz < 0 || newcm->size() == ncmsz, "newcm->size() inconsistency");
1093 newcm->set_is_conc_safe(true);
1094 return newm;
1095 }
1096
1097 vmSymbols::SID methodOopDesc::klass_id_for_intrinsics(klassOop holder) {
1098 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1099 // because we are not loading from core libraries
1100 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1101 // which does not use the class default class loader so we check for its loader here
1102 if ((instanceKlass::cast(holder)->class_loader() != NULL) &&
1103 instanceKlass::cast(holder)->class_loader()->klass()->klass_part()->name() != vmSymbols::sun_misc_Launcher_ExtClassLoader()) {
1104 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1105 }
1106
1107 // see if the klass name is well-known:
1108 Symbol* klass_name = instanceKlass::cast(holder)->name();
1109 return vmSymbols::find_sid(klass_name);
1110 }
1111
1112 void methodOopDesc::init_intrinsic_id() {
1113 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1114 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1115 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1116 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1117
1118 // the klass name is well-known:
1119 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1120 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1121
1122 // ditto for method and signature:
1123 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1124 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1125 && name_id == vmSymbols::NO_SID)
1126 return;
1127 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1128 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1129 && sig_id == vmSymbols::NO_SID) return;
1130 jshort flags = access_flags().as_short();
1131
1132 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1133 if (id != vmIntrinsics::_none) {
1134 set_intrinsic_id(id);
1135 return;
1136 }
1137
1138 // A few slightly irregular cases:
1139 switch (klass_id) {
1140 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1141 // Second chance: check in regular Math.
1142 switch (name_id) {
1143 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1144 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1145 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1146 // pretend it is the corresponding method in the non-strict class:
1147 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1148 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1149 break;
1150 }
1151 break;
1152
1153 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1154 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1155 if (!is_native()) break;
1156 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1157 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1158 id = vmIntrinsics::_none;
1159 break;
1160 }
1161
1162 if (id != vmIntrinsics::_none) {
1163 // Set up its iid. It is an alias method.
1164 set_intrinsic_id(id);
1165 return;
1166 }
1167 }
1168
1169 // These two methods are static since a GC may move the methodOopDesc
1170 bool methodOopDesc::load_signature_classes(methodHandle m, TRAPS) {
1171 if (THREAD->is_Compiler_thread()) {
1172 // There is nothing useful this routine can do from within the Compile thread.
1173 // Hopefully, the signature contains only well-known classes.
1174 // We could scan for this and return true/false, but the caller won't care.
1175 return false;
1176 }
1177 bool sig_is_loaded = true;
1178 Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader());
1179 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain());
1180 ResourceMark rm(THREAD);
1181 Symbol* signature = m->signature();
1182 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1183 if (ss.is_object()) {
1184 Symbol* sym = ss.as_symbol(CHECK_(false));
1185 Symbol* name = sym;
1186 klassOop klass = SystemDictionary::resolve_or_null(name, class_loader,
1187 protection_domain, THREAD);
1188 // We are loading classes eagerly. If a ClassNotFoundException or
1189 // a LinkageError was generated, be sure to ignore it.
1190 if (HAS_PENDING_EXCEPTION) {
1191 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1192 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1193 CLEAR_PENDING_EXCEPTION;
1194 } else {
1195 return false;
1196 }
1197 }
1198 if( klass == NULL) { sig_is_loaded = false; }
1199 }
1200 }
1201 return sig_is_loaded;
1202 }
1203
1204 bool methodOopDesc::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1205 Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader());
1206 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain());
1207 ResourceMark rm(THREAD);
1208 Symbol* signature = m->signature();
1209 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1210 if (ss.type() == T_OBJECT) {
1211 Symbol* name = ss.as_symbol_or_null();
1212 if (name == NULL) return true;
1213 klassOop klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1214 if (klass == NULL) return true;
1215 }
1216 }
1217 return false;
1218 }
1219
1220 // Exposed so field engineers can debug VM
1221 void methodOopDesc::print_short_name(outputStream* st) {
1222 ResourceMark rm;
1223 #ifdef PRODUCT
1224 st->print(" %s::", method_holder()->klass_part()->external_name());
1225 #else
1226 st->print(" %s::", method_holder()->klass_part()->internal_name());
1227 #endif
1228 name()->print_symbol_on(st);
1229 if (WizardMode) signature()->print_symbol_on(st);
1230 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1231 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1232 }
1233
1234 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1235 static void reorder_based_on_method_index(objArrayOop methods,
1236 objArrayOop annotations,
1237 GrowableArray<oop>* temp_array) {
1238 if (annotations == NULL) {
1239 return;
1240 }
1241
1242 int length = methods->length();
1243 int i;
1244 // Copy to temp array
1245 temp_array->clear();
1246 for (i = 0; i < length; i++) {
1247 temp_array->append(annotations->obj_at(i));
1248 }
1249
1250 // Copy back using old method indices
1251 for (i = 0; i < length; i++) {
1252 methodOop m = (methodOop) methods->obj_at(i);
1253 annotations->obj_at_put(i, temp_array->at(m->method_idnum()));
1254 }
1255 }
1256
1257 // Comparer for sorting an object array containing
1258 // methodOops.
1259 // Used non-template method_comparator methods since
1260 // Visual Studio 2003 compiler generates incorrect
1261 // optimized code for it.
1262 static int method_comparator_narrowOop(narrowOop a, narrowOop b) {
1263 methodOop m = (methodOop)oopDesc::decode_heap_oop_not_null(a);
1264 methodOop n = (methodOop)oopDesc::decode_heap_oop_not_null(b);
1265 return m->name()->fast_compare(n->name());
1266 }
1267 static int method_comparator_oop(oop a, oop b) {
1268 methodOop m = (methodOop)a;
1269 methodOop n = (methodOop)b;
1270 return m->name()->fast_compare(n->name());
1271 }
1272
1273 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1274 void methodOopDesc::sort_methods(objArrayOop methods,
1275 objArrayOop methods_annotations,
1276 objArrayOop methods_parameter_annotations,
1277 objArrayOop methods_default_annotations,
1278 bool idempotent) {
1279 int length = methods->length();
1280 if (length > 1) {
1281 bool do_annotations = false;
1282 if (methods_annotations != NULL ||
1283 methods_parameter_annotations != NULL ||
1284 methods_default_annotations != NULL) {
1285 do_annotations = true;
1286 }
1287 if (do_annotations) {
1288 // Remember current method ordering so we can reorder annotations
1289 for (int i = 0; i < length; i++) {
1290 methodOop m = (methodOop) methods->obj_at(i);
1291 m->set_method_idnum(i);
1292 }
1293 }
1294 {
1295 No_Safepoint_Verifier nsv;
1296 if (UseCompressedOops) {
1297 QuickSort::sort<narrowOop>((narrowOop*)(methods->base()), length, method_comparator_narrowOop, idempotent);
1298 } else {
1299 QuickSort::sort<oop>((oop*)(methods->base()), length, method_comparator_oop, idempotent);
1300 }
1301 if (UseConcMarkSweepGC) {
1302 // For CMS we need to dirty the cards for the array
1303 BarrierSet* bs = Universe::heap()->barrier_set();
1304 assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt");
1305 bs->write_ref_array(methods->base(), length);
1306 }
1307 }
1308
1309 // Sort annotations if necessary
1310 assert(methods_annotations == NULL || methods_annotations->length() == methods->length(), "");
1311 assert(methods_parameter_annotations == NULL || methods_parameter_annotations->length() == methods->length(), "");
1312 assert(methods_default_annotations == NULL || methods_default_annotations->length() == methods->length(), "");
1313 if (do_annotations) {
1314 ResourceMark rm;
1315 // Allocate temporary storage
1316 GrowableArray<oop>* temp_array = new GrowableArray<oop>(length);
1317 reorder_based_on_method_index(methods, methods_annotations, temp_array);
1318 reorder_based_on_method_index(methods, methods_parameter_annotations, temp_array);
1319 reorder_based_on_method_index(methods, methods_default_annotations, temp_array);
1320 }
1321
1322 // Reset method ordering
1323 for (int i = 0; i < length; i++) {
1324 methodOop m = (methodOop) methods->obj_at(i);
1325 m->set_method_idnum(i);
1326 }
1327 }
1328 }
1329
1330
1331 class SignatureTypePrinter : public SignatureTypeNames {
1332 private:
1333 outputStream* _st;
1334 bool _use_separator;
1335
1336 void type_name(const char* name) {
1337 if (_use_separator) _st->print(", ");
1338 _st->print(name);
1339 _use_separator = true;
1340 }
1341
1342 public:
1343 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1344 _st = st;
1345 _use_separator = false;
1346 }
1347
1348 void print_parameters() { _use_separator = false; iterate_parameters(); }
1349 void print_returntype() { _use_separator = false; iterate_returntype(); }
1350 };
1351
1352
1353 void methodOopDesc::print_name(outputStream* st) {
1354 Thread *thread = Thread::current();
1355 ResourceMark rm(thread);
1356 SignatureTypePrinter sig(signature(), st);
1357 st->print("%s ", is_static() ? "static" : "virtual");
1358 sig.print_returntype();
1359 st->print(" %s.", method_holder()->klass_part()->internal_name());
1360 name()->print_symbol_on(st);
1361 st->print("(");
1362 sig.print_parameters();
1363 st->print(")");
1364 }
1365
1366
1367 //-----------------------------------------------------------------------------------
1368 // Non-product code
1369
1370 #ifndef PRODUCT
1371 void methodOopDesc::print_codes_on(outputStream* st) const {
1372 print_codes_on(0, code_size(), st);
1373 }
1374
1375 void methodOopDesc::print_codes_on(int from, int to, outputStream* st) const {
1376 Thread *thread = Thread::current();
1377 ResourceMark rm(thread);
1378 methodHandle mh (thread, (methodOop)this);
1379 BytecodeStream s(mh);
1380 s.set_interval(from, to);
1381 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1382 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1383 }
1384 #endif // not PRODUCT
1385
1386
1387 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1388 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1389 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1390 // as end-of-stream terminator.
1391
1392 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1393 // bci and line number does not compress into single byte.
1394 // Write out escape character and use regular compression for bci and line number.
1395 write_byte((jubyte)0xFF);
1396 write_signed_int(bci_delta);
1397 write_signed_int(line_delta);
1398 }
1399
1400 // See comment in methodOop.hpp which explains why this exists.
1401 #if defined(_M_AMD64) && _MSC_VER >= 1400
1402 #pragma optimize("", off)
1403 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1404 write_pair_inline(bci, line);
1405 }
1406 #pragma optimize("", on)
1407 #endif
1408
1409 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1410 _bci = 0;
1411 _line = 0;
1412 };
1413
1414
1415 bool CompressedLineNumberReadStream::read_pair() {
1416 jubyte next = read_byte();
1417 // Check for terminator
1418 if (next == 0) return false;
1419 if (next == 0xFF) {
1420 // Escape character, regular compression used
1421 _bci += read_signed_int();
1422 _line += read_signed_int();
1423 } else {
1424 // Single byte compression used
1425 _bci += next >> 3;
1426 _line += next & 0x7;
1427 }
1428 return true;
1429 }
1430
1431
1432 Bytecodes::Code methodOopDesc::orig_bytecode_at(int bci) const {
1433 BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints();
1434 for (; bp != NULL; bp = bp->next()) {
1435 if (bp->match(this, bci)) {
1436 return bp->orig_bytecode();
1437 }
1438 }
1439 ShouldNotReachHere();
1440 return Bytecodes::_shouldnotreachhere;
1441 }
1442
1443 void methodOopDesc::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1444 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1445 BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints();
1446 for (; bp != NULL; bp = bp->next()) {
1447 if (bp->match(this, bci)) {
1448 bp->set_orig_bytecode(code);
1449 // and continue, in case there is more than one
1450 }
1451 }
1452 }
1453
1454 void methodOopDesc::set_breakpoint(int bci) {
1455 instanceKlass* ik = instanceKlass::cast(method_holder());
1456 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1457 bp->set_next(ik->breakpoints());
1458 ik->set_breakpoints(bp);
1459 // do this last:
1460 bp->set(this);
1461 }
1462
1463 static void clear_matches(methodOop m, int bci) {
1464 instanceKlass* ik = instanceKlass::cast(m->method_holder());
1465 BreakpointInfo* prev_bp = NULL;
1466 BreakpointInfo* next_bp;
1467 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1468 next_bp = bp->next();
1469 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1470 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1471 // do this first:
1472 bp->clear(m);
1473 // unhook it
1474 if (prev_bp != NULL)
1475 prev_bp->set_next(next_bp);
1476 else
1477 ik->set_breakpoints(next_bp);
1478 delete bp;
1479 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1480 // at same location. So we have multiple matching (method_index and bci)
1481 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1482 // breakpoint for clear_breakpoint request and keep all other method versions
1483 // BreakpointInfo for future clear_breakpoint request.
1484 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1485 // which is being called when class is unloaded. We delete all the Breakpoint
1486 // information for all versions of method. We may not correctly restore the original
1487 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1488 // so these methods won't be used anymore.
1489 if (bci >= 0) {
1490 break;
1491 }
1492 } else {
1493 // This one is a keeper.
1494 prev_bp = bp;
1495 }
1496 }
1497 }
1498
1499 void methodOopDesc::clear_breakpoint(int bci) {
1500 assert(bci >= 0, "");
1501 clear_matches(this, bci);
1502 }
1503
1504 void methodOopDesc::clear_all_breakpoints() {
1505 clear_matches(this, -1);
1506 }
1507
1508
1509 int methodOopDesc::invocation_count() {
1510 if (TieredCompilation) {
1511 const methodDataOop mdo = method_data();
1512 if (invocation_counter()->carry() || ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1513 return InvocationCounter::count_limit;
1514 } else {
1515 return invocation_counter()->count() + ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1516 }
1517 } else {
1518 return invocation_counter()->count();
1519 }
1520 }
1521
1522 int methodOopDesc::backedge_count() {
1523 if (TieredCompilation) {
1524 const methodDataOop mdo = method_data();
1525 if (backedge_counter()->carry() || ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1526 return InvocationCounter::count_limit;
1527 } else {
1528 return backedge_counter()->count() + ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1529 }
1530 } else {
1531 return backedge_counter()->count();
1532 }
1533 }
1534
1535 int methodOopDesc::highest_comp_level() const {
1536 methodDataOop mdo = method_data();
1537 if (mdo != NULL) {
1538 return mdo->highest_comp_level();
1539 } else {
1540 return CompLevel_none;
1541 }
1542 }
1543
1544 int methodOopDesc::highest_osr_comp_level() const {
1545 methodDataOop mdo = method_data();
1546 if (mdo != NULL) {
1547 return mdo->highest_osr_comp_level();
1548 } else {
1549 return CompLevel_none;
1550 }
1551 }
1552
1553 void methodOopDesc::set_highest_comp_level(int level) {
1554 methodDataOop mdo = method_data();
1555 if (mdo != NULL) {
1556 mdo->set_highest_comp_level(level);
1557 }
1558 }
1559
1560 void methodOopDesc::set_highest_osr_comp_level(int level) {
1561 methodDataOop mdo = method_data();
1562 if (mdo != NULL) {
1563 mdo->set_highest_osr_comp_level(level);
1564 }
1565 }
1566
1567 BreakpointInfo::BreakpointInfo(methodOop m, int bci) {
1568 _bci = bci;
1569 _name_index = m->name_index();
1570 _signature_index = m->signature_index();
1571 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1572 if (_orig_bytecode == Bytecodes::_breakpoint)
1573 _orig_bytecode = m->orig_bytecode_at(_bci);
1574 _next = NULL;
1575 }
1576
1577 void BreakpointInfo::set(methodOop method) {
1578 #ifdef ASSERT
1579 {
1580 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1581 if (code == Bytecodes::_breakpoint)
1582 code = method->orig_bytecode_at(_bci);
1583 assert(orig_bytecode() == code, "original bytecode must be the same");
1584 }
1585 #endif
1586 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1587 method->incr_number_of_breakpoints();
1588 SystemDictionary::notice_modification();
1589 {
1590 // Deoptimize all dependents on this method
1591 Thread *thread = Thread::current();
1592 HandleMark hm(thread);
1593 methodHandle mh(thread, method);
1594 Universe::flush_dependents_on_method(mh);
1595 }
1596 }
1597
1598 void BreakpointInfo::clear(methodOop method) {
1599 *method->bcp_from(_bci) = orig_bytecode();
1600 assert(method->number_of_breakpoints() > 0, "must not go negative");
1601 method->decr_number_of_breakpoints();
1602 }