1 /*
2 * Copyright (c) 1997, 2012, 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/methodHandleWalk.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() {
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) {
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(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 const int beg_bci_offset = 0;
115 const int end_bci_offset = 1;
116 const int handler_bci_offset = 2;
117 const int klass_index_offset = 3;
118 const int entry_size = 4;
119 // access exception table
120 typeArrayHandle table (THREAD, constMethod()->exception_table());
121 int length = table->length();
122 assert(length % entry_size == 0, "exception table format has changed");
123 // iterate through all entries sequentially
124 constantPoolHandle pool(THREAD, constants());
125 for (int i = 0; i < length; i += entry_size) {
126 int beg_bci = table->int_at(i + beg_bci_offset);
127 int end_bci = table->int_at(i + end_bci_offset);
128 assert(beg_bci <= end_bci, "inconsistent exception table");
129 if (beg_bci <= throw_bci && throw_bci < end_bci) {
130 // exception handler bci range covers throw_bci => investigate further
131 int handler_bci = table->int_at(i + handler_bci_offset);
132 int klass_index = table->int_at(i + klass_index_offset);
133 if (klass_index == 0) {
134 return handler_bci;
135 } else if (ex_klass.is_null()) {
136 return handler_bci;
137 } else {
138 // we know the exception class => get the constraint class
139 // this may require loading of the constraint class; if verification
140 // fails or some other exception occurs, return handler_bci
141 klassOop k = pool->klass_at(klass_index, CHECK_(handler_bci));
142 KlassHandle klass = KlassHandle(THREAD, k);
143 assert(klass.not_null(), "klass not loaded");
144 if (ex_klass->is_subtype_of(klass())) {
145 return handler_bci;
146 }
147 }
148 }
149 }
150
151 return -1;
152 }
153
154 void methodOopDesc::mask_for(int bci, InterpreterOopMap* mask) {
155
156 Thread* myThread = Thread::current();
157 methodHandle h_this(myThread, this);
158 #ifdef ASSERT
159 bool has_capability = myThread->is_VM_thread() ||
160 myThread->is_ConcurrentGC_thread() ||
161 myThread->is_GC_task_thread();
162
163 if (!has_capability) {
164 if (!VerifyStack && !VerifyLastFrame) {
165 // verify stack calls this outside VM thread
166 warning("oopmap should only be accessed by the "
167 "VM, GC task or CMS threads (or during debugging)");
168 InterpreterOopMap local_mask;
169 instanceKlass::cast(method_holder())->mask_for(h_this, bci, &local_mask);
170 local_mask.print();
171 }
172 }
173 #endif
174 instanceKlass::cast(method_holder())->mask_for(h_this, bci, mask);
175 return;
176 }
177
178
179 int methodOopDesc::bci_from(address bcp) const {
180 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), "bcp doesn't belong to this method");
181 return bcp - code_base();
182 }
183
184
185 // Return (int)bcx if it appears to be a valid BCI.
186 // Return bci_from((address)bcx) if it appears to be a valid BCP.
187 // Return -1 otherwise.
188 // Used by profiling code, when invalid data is a possibility.
189 // The caller is responsible for validating the methodOop itself.
190 int methodOopDesc::validate_bci_from_bcx(intptr_t bcx) const {
191 // keep bci as -1 if not a valid bci
192 int bci = -1;
193 if (bcx == 0 || (address)bcx == code_base()) {
194 // code_size() may return 0 and we allow 0 here
195 // the method may be native
196 bci = 0;
197 } else if (frame::is_bci(bcx)) {
198 if (bcx < code_size()) {
199 bci = (int)bcx;
200 }
201 } else if (contains((address)bcx)) {
202 bci = (address)bcx - code_base();
203 }
204 // Assert that if we have dodged any asserts, bci is negative.
205 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
206 return bci;
207 }
208
209 address methodOopDesc::bcp_from(int bci) const {
210 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci");
211 address bcp = code_base() + bci;
212 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
213 return bcp;
214 }
215
216
217 int methodOopDesc::object_size(bool is_native) {
218 // If native, then include pointers for native_function and signature_handler
219 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
220 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
221 return align_object_size(header_size() + extra_words);
222 }
223
224
225 Symbol* methodOopDesc::klass_name() const {
226 klassOop k = method_holder();
227 assert(k->is_klass(), "must be klass");
228 instanceKlass* ik = (instanceKlass*) k->klass_part();
229 return ik->name();
230 }
231
232
233 void methodOopDesc::set_interpreter_kind() {
234 int kind = Interpreter::method_kind(methodOop(this));
235 assert(kind != Interpreter::invalid,
236 "interpreter entry must be valid");
237 set_interpreter_kind(kind);
238 }
239
240
241 // Attempt to return method oop to original state. Clear any pointers
242 // (to objects outside the shared spaces). We won't be able to predict
243 // where they should point in a new JVM. Further initialize some
244 // entries now in order allow them to be write protected later.
245
246 void methodOopDesc::remove_unshareable_info() {
247 unlink_method();
248 set_interpreter_kind();
249 }
250
251
252 bool methodOopDesc::was_executed_more_than(int n) {
253 // Invocation counter is reset when the methodOop is compiled.
254 // If the method has compiled code we therefore assume it has
255 // be excuted more than n times.
256 if (is_accessor() || is_empty_method() || (code() != NULL)) {
257 // interpreter doesn't bump invocation counter of trivial methods
258 // compiler does not bump invocation counter of compiled methods
259 return true;
260 }
261 else if (_invocation_counter.carry() || (method_data() != NULL && method_data()->invocation_counter()->carry())) {
262 // The carry bit is set when the counter overflows and causes
263 // a compilation to occur. We don't know how many times
264 // the counter has been reset, so we simply assume it has
265 // been executed more than n times.
266 return true;
267 } else {
268 return invocation_count() > n;
269 }
270 }
271
272 #ifndef PRODUCT
273 void methodOopDesc::print_invocation_count() {
274 if (is_static()) tty->print("static ");
275 if (is_final()) tty->print("final ");
276 if (is_synchronized()) tty->print("synchronized ");
277 if (is_native()) tty->print("native ");
278 method_holder()->klass_part()->name()->print_symbol_on(tty);
279 tty->print(".");
280 name()->print_symbol_on(tty);
281 signature()->print_symbol_on(tty);
282
283 if (WizardMode) {
284 // dump the size of the byte codes
285 tty->print(" {%d}", code_size());
286 }
287 tty->cr();
288
289 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
290 tty->print_cr (" invocation_counter: %8d ", invocation_count());
291 tty->print_cr (" backedge_counter: %8d ", backedge_count());
292 if (CountCompiledCalls) {
293 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
294 }
295
296 }
297 #endif
298
299 // Build a methodDataOop object to hold information about this method
300 // collected in the interpreter.
301 void methodOopDesc::build_interpreter_method_data(methodHandle method, TRAPS) {
302 // Do not profile method if current thread holds the pending list lock,
303 // which avoids deadlock for acquiring the MethodData_lock.
304 if (instanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
305 return;
306 }
307
308 // Grab a lock here to prevent multiple
309 // methodDataOops from being created.
310 MutexLocker ml(MethodData_lock, THREAD);
311 if (method->method_data() == NULL) {
312 methodDataOop method_data = oopFactory::new_methodData(method, CHECK);
313 method->set_method_data(method_data);
314 if (PrintMethodData && (Verbose || WizardMode)) {
315 ResourceMark rm(THREAD);
316 tty->print("build_interpreter_method_data for ");
317 method->print_name(tty);
318 tty->cr();
319 // At the end of the run, the MDO, full of data, will be dumped.
320 }
321 }
322 }
323
324 void methodOopDesc::cleanup_inline_caches() {
325 // The current system doesn't use inline caches in the interpreter
326 // => nothing to do (keep this method around for future use)
327 }
328
329
330 int methodOopDesc::extra_stack_words() {
331 // not an inline function, to avoid a header dependency on Interpreter
332 return extra_stack_entries() * Interpreter::stackElementSize;
333 }
334
335
336 void methodOopDesc::compute_size_of_parameters(Thread *thread) {
337 ArgumentSizeComputer asc(signature());
338 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
339 }
340
341 #ifdef CC_INTERP
342 void methodOopDesc::set_result_index(BasicType type) {
343 _result_index = Interpreter::BasicType_as_index(type);
344 }
345 #endif
346
347 BasicType methodOopDesc::result_type() const {
348 ResultTypeFinder rtf(signature());
349 return rtf.type();
350 }
351
352
353 bool methodOopDesc::is_empty_method() const {
354 return code_size() == 1
355 && *code_base() == Bytecodes::_return;
356 }
357
358
359 bool methodOopDesc::is_vanilla_constructor() const {
360 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
361 // which only calls the superclass vanilla constructor and possibly does stores of
362 // zero constants to local fields:
363 //
364 // aload_0
365 // invokespecial
366 // indexbyte1
367 // indexbyte2
368 //
369 // followed by an (optional) sequence of:
370 //
371 // aload_0
372 // aconst_null / iconst_0 / fconst_0 / dconst_0
373 // putfield
374 // indexbyte1
375 // indexbyte2
376 //
377 // followed by:
378 //
379 // return
380
381 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
382 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
383 int size = code_size();
384 // Check if size match
385 if (size == 0 || size % 5 != 0) return false;
386 address cb = code_base();
387 int last = size - 1;
388 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
389 // Does not call superclass default constructor
390 return false;
391 }
392 // Check optional sequence
393 for (int i = 4; i < last; i += 5) {
394 if (cb[i] != Bytecodes::_aload_0) return false;
395 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
396 if (cb[i+2] != Bytecodes::_putfield) return false;
397 }
398 return true;
399 }
400
401
402 bool methodOopDesc::compute_has_loops_flag() {
403 BytecodeStream bcs(methodOop(this));
404 Bytecodes::Code bc;
405
406 while ((bc = bcs.next()) >= 0) {
407 switch( bc ) {
408 case Bytecodes::_ifeq:
409 case Bytecodes::_ifnull:
410 case Bytecodes::_iflt:
411 case Bytecodes::_ifle:
412 case Bytecodes::_ifne:
413 case Bytecodes::_ifnonnull:
414 case Bytecodes::_ifgt:
415 case Bytecodes::_ifge:
416 case Bytecodes::_if_icmpeq:
417 case Bytecodes::_if_icmpne:
418 case Bytecodes::_if_icmplt:
419 case Bytecodes::_if_icmpgt:
420 case Bytecodes::_if_icmple:
421 case Bytecodes::_if_icmpge:
422 case Bytecodes::_if_acmpeq:
423 case Bytecodes::_if_acmpne:
424 case Bytecodes::_goto:
425 case Bytecodes::_jsr:
426 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
427 break;
428
429 case Bytecodes::_goto_w:
430 case Bytecodes::_jsr_w:
431 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
432 break;
433 }
434 }
435 _access_flags.set_loops_flag_init();
436 return _access_flags.has_loops();
437 }
438
439
440 bool methodOopDesc::is_final_method() const {
441 // %%% Should return true for private methods also,
442 // since there is no way to override them.
443 return is_final() || Klass::cast(method_holder())->is_final();
444 }
445
446
447 bool methodOopDesc::is_strict_method() const {
448 return is_strict();
449 }
450
451
452 bool methodOopDesc::can_be_statically_bound() const {
453 if (is_final_method()) return true;
454 return vtable_index() == nonvirtual_vtable_index;
455 }
456
457
458 bool methodOopDesc::is_accessor() const {
459 if (code_size() != 5) return false;
460 if (size_of_parameters() != 1) return false;
461 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
462 if (java_code_at(1) != Bytecodes::_getfield) return false;
463 if (java_code_at(4) != Bytecodes::_areturn &&
464 java_code_at(4) != Bytecodes::_ireturn ) return false;
465 return true;
466 }
467
468
469 bool methodOopDesc::is_initializer() const {
470 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
471 }
472
473 bool methodOopDesc::has_valid_initializer_flags() const {
474 return (is_static() ||
475 instanceKlass::cast(method_holder())->major_version() < 51);
476 }
477
478 bool methodOopDesc::is_static_initializer() const {
479 // For classfiles version 51 or greater, ensure that the clinit method is
480 // static. Non-static methods with the name "<clinit>" are not static
481 // initializers. (older classfiles exempted for backward compatibility)
482 return name() == vmSymbols::class_initializer_name() &&
483 has_valid_initializer_flags();
484 }
485
486
487 objArrayHandle methodOopDesc::resolved_checked_exceptions_impl(methodOop this_oop, TRAPS) {
488 int length = this_oop->checked_exceptions_length();
489 if (length == 0) { // common case
490 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
491 } else {
492 methodHandle h_this(THREAD, this_oop);
493 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
494 objArrayHandle mirrors (THREAD, m_oop);
495 for (int i = 0; i < length; i++) {
496 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
497 klassOop k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
498 assert(Klass::cast(k)->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
499 mirrors->obj_at_put(i, Klass::cast(k)->java_mirror());
500 }
501 return mirrors;
502 }
503 };
504
505
506 int methodOopDesc::line_number_from_bci(int bci) const {
507 if (bci == SynchronizationEntryBCI) bci = 0;
508 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
509 int best_bci = 0;
510 int best_line = -1;
511
512 if (has_linenumber_table()) {
513 // The line numbers are a short array of 2-tuples [start_pc, line_number].
514 // Not necessarily sorted and not necessarily one-to-one.
515 CompressedLineNumberReadStream stream(compressed_linenumber_table());
516 while (stream.read_pair()) {
517 if (stream.bci() == bci) {
518 // perfect match
519 return stream.line();
520 } else {
521 // update best_bci/line
522 if (stream.bci() < bci && stream.bci() >= best_bci) {
523 best_bci = stream.bci();
524 best_line = stream.line();
525 }
526 }
527 }
528 }
529 return best_line;
530 }
531
532
533 bool methodOopDesc::is_klass_loaded_by_klass_index(int klass_index) const {
534 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
535 Thread *thread = Thread::current();
536 Symbol* klass_name = constants()->klass_name_at(klass_index);
537 Handle loader(thread, instanceKlass::cast(method_holder())->class_loader());
538 Handle prot (thread, Klass::cast(method_holder())->protection_domain());
539 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
540 } else {
541 return true;
542 }
543 }
544
545
546 bool methodOopDesc::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
547 int klass_index = constants()->klass_ref_index_at(refinfo_index);
548 if (must_be_resolved) {
549 // Make sure klass is resolved in constantpool.
550 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
551 }
552 return is_klass_loaded_by_klass_index(klass_index);
553 }
554
555
556 void methodOopDesc::set_native_function(address function, bool post_event_flag) {
557 assert(function != NULL, "use clear_native_function to unregister natives");
558 address* native_function = native_function_addr();
559
560 // We can see racers trying to place the same native function into place. Once
561 // is plenty.
562 address current = *native_function;
563 if (current == function) return;
564 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
565 function != NULL) {
566 // native_method_throw_unsatisfied_link_error_entry() should only
567 // be passed when post_event_flag is false.
568 assert(function !=
569 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
570 "post_event_flag mis-match");
571
572 // post the bind event, and possible change the bind function
573 JvmtiExport::post_native_method_bind(this, &function);
574 }
575 *native_function = function;
576 // This function can be called more than once. We must make sure that we always
577 // use the latest registered method -> check if a stub already has been generated.
578 // If so, we have to make it not_entrant.
579 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
580 if (nm != NULL) {
581 nm->make_not_entrant();
582 }
583 }
584
585
586 bool methodOopDesc::has_native_function() const {
587 address func = native_function();
588 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
589 }
590
591
592 void methodOopDesc::clear_native_function() {
593 set_native_function(
594 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
595 !native_bind_event_is_interesting);
596 clear_code();
597 }
598
599 address methodOopDesc::critical_native_function() {
600 methodHandle mh(this);
601 return NativeLookup::lookup_critical_entry(mh);
602 }
603
604
605 void methodOopDesc::set_signature_handler(address handler) {
606 address* signature_handler = signature_handler_addr();
607 *signature_handler = handler;
608 }
609
610
611 bool methodOopDesc::is_not_compilable(int comp_level) const {
612 if (is_method_handle_invoke()) {
613 // compilers must recognize this method specially, or not at all
614 return true;
615 }
616 if (number_of_breakpoints() > 0) {
617 return true;
618 }
619 if (comp_level == CompLevel_any) {
620 return is_not_c1_compilable() || is_not_c2_compilable();
621 }
622 if (is_c1_compile(comp_level)) {
623 return is_not_c1_compilable();
624 }
625 if (is_c2_compile(comp_level)) {
626 return is_not_c2_compilable();
627 }
628 return false;
629 }
630
631 // call this when compiler finds that this method is not compilable
632 void methodOopDesc::set_not_compilable(int comp_level, bool report) {
633 if (PrintCompilation && report) {
634 ttyLocker ttyl;
635 tty->print("made not compilable ");
636 this->print_short_name(tty);
637 int size = this->code_size();
638 if (size > 0)
639 tty->print(" (%d bytes)", size);
640 tty->cr();
641 }
642 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
643 ttyLocker ttyl;
644 xtty->begin_elem("make_not_compilable thread='%d'", (int) os::current_thread_id());
645 xtty->method(methodOop(this));
646 xtty->stamp();
647 xtty->end_elem();
648 }
649 if (comp_level == CompLevel_all) {
650 set_not_c1_compilable();
651 set_not_c2_compilable();
652 } else {
653 if (is_c1_compile(comp_level)) {
654 set_not_c1_compilable();
655 } else
656 if (is_c2_compile(comp_level)) {
657 set_not_c2_compilable();
658 }
659 }
660 CompilationPolicy::policy()->disable_compilation(this);
661 }
662
663 // Revert to using the interpreter and clear out the nmethod
664 void methodOopDesc::clear_code() {
665
666 // this may be NULL if c2i adapters have not been made yet
667 // Only should happen at allocate time.
668 if (_adapter == NULL) {
669 _from_compiled_entry = NULL;
670 } else {
671 _from_compiled_entry = _adapter->get_c2i_entry();
672 }
673 OrderAccess::storestore();
674 _from_interpreted_entry = _i2i_entry;
675 OrderAccess::storestore();
676 _code = NULL;
677 }
678
679 // Called by class data sharing to remove any entry points (which are not shared)
680 void methodOopDesc::unlink_method() {
681 _code = NULL;
682 _i2i_entry = NULL;
683 _from_interpreted_entry = NULL;
684 if (is_native()) {
685 *native_function_addr() = NULL;
686 set_signature_handler(NULL);
687 }
688 NOT_PRODUCT(set_compiled_invocation_count(0);)
689 invocation_counter()->reset();
690 backedge_counter()->reset();
691 _adapter = NULL;
692 _from_compiled_entry = NULL;
693 assert(_method_data == NULL, "unexpected method data?");
694 set_method_data(NULL);
695 set_interpreter_throwout_count(0);
696 set_interpreter_invocation_count(0);
697 }
698
699 // Called when the method_holder is getting linked. Setup entrypoints so the method
700 // is ready to be called from interpreter, compiler, and vtables.
701 void methodOopDesc::link_method(methodHandle h_method, TRAPS) {
702 // If the code cache is full, we may reenter this function for the
703 // leftover methods that weren't linked.
704 if (_i2i_entry != NULL) return;
705
706 assert(_adapter == NULL, "init'd to NULL" );
707 assert( _code == NULL, "nothing compiled yet" );
708
709 // Setup interpreter entrypoint
710 assert(this == h_method(), "wrong h_method()" );
711 address entry = Interpreter::entry_for_method(h_method);
712 assert(entry != NULL, "interpreter entry must be non-null");
713 // Sets both _i2i_entry and _from_interpreted_entry
714 set_interpreter_entry(entry);
715 if (is_native() && !is_method_handle_invoke()) {
716 set_native_function(
717 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
718 !native_bind_event_is_interesting);
719 }
720
721 // Setup compiler entrypoint. This is made eagerly, so we do not need
722 // special handling of vtables. An alternative is to make adapters more
723 // lazily by calling make_adapter() from from_compiled_entry() for the
724 // normal calls. For vtable calls life gets more complicated. When a
725 // call-site goes mega-morphic we need adapters in all methods which can be
726 // called from the vtable. We need adapters on such methods that get loaded
727 // later. Ditto for mega-morphic itable calls. If this proves to be a
728 // problem we'll make these lazily later.
729 (void) make_adapters(h_method, CHECK);
730
731 // ONLY USE the h_method now as make_adapter may have blocked
732
733 }
734
735 address methodOopDesc::make_adapters(methodHandle mh, TRAPS) {
736 // Adapters for compiled code are made eagerly here. They are fairly
737 // small (generally < 100 bytes) and quick to make (and cached and shared)
738 // so making them eagerly shouldn't be too expensive.
739 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
740 if (adapter == NULL ) {
741 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
742 }
743
744 mh->set_adapter_entry(adapter);
745 mh->_from_compiled_entry = adapter->get_c2i_entry();
746 return adapter->get_c2i_entry();
747 }
748
749 // The verified_code_entry() must be called when a invoke is resolved
750 // on this method.
751
752 // It returns the compiled code entry point, after asserting not null.
753 // This function is called after potential safepoints so that nmethod
754 // or adapter that it points to is still live and valid.
755 // This function must not hit a safepoint!
756 address methodOopDesc::verified_code_entry() {
757 debug_only(No_Safepoint_Verifier nsv;)
758 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
759 if (code == NULL && UseCodeCacheFlushing) {
760 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this);
761 if (saved_code != NULL) {
762 methodHandle method(this);
763 assert( ! saved_code->is_osr_method(), "should not get here for osr" );
764 set_code( method, saved_code );
765 }
766 }
767
768 assert(_from_compiled_entry != NULL, "must be set");
769 return _from_compiled_entry;
770 }
771
772 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
773 // (could be racing a deopt).
774 // Not inline to avoid circular ref.
775 bool methodOopDesc::check_code() const {
776 // cached in a register or local. There's a race on the value of the field.
777 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
778 return code == NULL || (code->method() == NULL) || (code->method() == (methodOop)this && !code->is_osr_method());
779 }
780
781 // Install compiled code. Instantly it can execute.
782 void methodOopDesc::set_code(methodHandle mh, nmethod *code) {
783 assert( code, "use clear_code to remove code" );
784 assert( mh->check_code(), "" );
785
786 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
787
788 // These writes must happen in this order, because the interpreter will
789 // directly jump to from_interpreted_entry which jumps to an i2c adapter
790 // which jumps to _from_compiled_entry.
791 mh->_code = code; // Assign before allowing compiled code to exec
792
793 int comp_level = code->comp_level();
794 // In theory there could be a race here. In practice it is unlikely
795 // and not worth worrying about.
796 if (comp_level > mh->highest_comp_level()) {
797 mh->set_highest_comp_level(comp_level);
798 }
799
800 OrderAccess::storestore();
801 #ifdef SHARK
802 mh->_from_interpreted_entry = code->insts_begin();
803 #else
804 mh->_from_compiled_entry = code->verified_entry_point();
805 OrderAccess::storestore();
806 // Instantly compiled code can execute.
807 mh->_from_interpreted_entry = mh->get_i2c_entry();
808 #endif // SHARK
809
810 }
811
812
813 bool methodOopDesc::is_overridden_in(klassOop k) const {
814 instanceKlass* ik = instanceKlass::cast(k);
815
816 if (ik->is_interface()) return false;
817
818 // If method is an interface, we skip it - except if it
819 // is a miranda method
820 if (instanceKlass::cast(method_holder())->is_interface()) {
821 // Check that method is not a miranda method
822 if (ik->lookup_method(name(), signature()) == NULL) {
823 // No implementation exist - so miranda method
824 return false;
825 }
826 return true;
827 }
828
829 assert(ik->is_subclass_of(method_holder()), "should be subklass");
830 assert(ik->vtable() != NULL, "vtable should exist");
831 if (vtable_index() == nonvirtual_vtable_index) {
832 return false;
833 } else {
834 methodOop vt_m = ik->method_at_vtable(vtable_index());
835 return vt_m != methodOop(this);
836 }
837 }
838
839
840 // give advice about whether this methodOop should be cached or not
841 bool methodOopDesc::should_not_be_cached() const {
842 if (is_old()) {
843 // This method has been redefined. It is either EMCP or obsolete
844 // and we don't want to cache it because that would pin the method
845 // down and prevent it from being collectible if and when it
846 // finishes executing.
847 return true;
848 }
849
850 if (mark()->should_not_be_cached()) {
851 // It is either not safe or not a good idea to cache this
852 // method at this time because of the state of the embedded
853 // markOop. See markOop.cpp for the gory details.
854 return true;
855 }
856
857 // caching this method should be just fine
858 return false;
859 }
860
861 bool methodOopDesc::is_method_handle_invoke_name(vmSymbols::SID name_sid) {
862 switch (name_sid) {
863 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeExact_name):
864 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name):
865 return true;
866 }
867 if (AllowInvokeGeneric
868 && name_sid == vmSymbols::VM_SYMBOL_ENUM_NAME(invokeGeneric_name))
869 return true;
870 return false;
871 }
872
873 // Constant pool structure for invoke methods:
874 enum {
875 _imcp_invoke_name = 1, // utf8: 'invokeExact' or 'invokeGeneric'
876 _imcp_invoke_signature, // utf8: (variable Symbol*)
877 _imcp_method_type_value, // string: (variable java/lang/invoke/MethodType, sic)
878 _imcp_limit
879 };
880
881 oop methodOopDesc::method_handle_type() const {
882 if (!is_method_handle_invoke()) { assert(false, "caller resp."); return NULL; }
883 oop mt = constants()->resolved_string_at(_imcp_method_type_value);
884 assert(mt->klass() == SystemDictionary::MethodType_klass(), "");
885 return mt;
886 }
887
888 jint* methodOopDesc::method_type_offsets_chain() {
889 static jint pchase[] = { -1, -1, -1, -1 };
890 if (pchase[0] == -1) {
891 jint step0 = in_bytes(const_offset());
892 jint step1 = in_bytes(constMethodOopDesc::constants_offset());
893 jint step2 = (constantPoolOopDesc::header_size() + _imcp_method_type_value) * HeapWordSize;
894 // do this in reverse to avoid races:
895 OrderAccess::release_store(&pchase[2], step2);
896 OrderAccess::release_store(&pchase[1], step1);
897 OrderAccess::release_store(&pchase[0], step0);
898 }
899 return pchase;
900 }
901
902 //------------------------------------------------------------------------------
903 // methodOopDesc::is_method_handle_adapter
904 //
905 // Tests if this method is an internal adapter frame from the
906 // MethodHandleCompiler.
907 // Must be consistent with MethodHandleCompiler::get_method_oop().
908 bool methodOopDesc::is_method_handle_adapter() const {
909 if (is_synthetic() &&
910 !is_native() && // has code from MethodHandleCompiler
911 is_method_handle_invoke_name(name()) &&
912 MethodHandleCompiler::klass_is_method_handle_adapter_holder(method_holder())) {
913 assert(!is_method_handle_invoke(), "disjoint");
914 return true;
915 } else {
916 return false;
917 }
918 }
919
920 methodHandle methodOopDesc::make_invoke_method(KlassHandle holder,
921 Symbol* name,
922 Symbol* signature,
923 Handle method_type, TRAPS) {
924 ResourceMark rm;
925 methodHandle empty;
926
927 assert(holder() == SystemDictionary::MethodHandle_klass(),
928 "must be a JSR 292 magic type");
929
930 if (TraceMethodHandles) {
931 tty->print("Creating invoke method for ");
932 signature->print_value();
933 tty->cr();
934 }
935
936 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
937 name->increment_refcount();
938 signature->increment_refcount();
939
940 // record non-BCP method types in the constant pool
941 GrowableArray<KlassHandle>* extra_klasses = NULL;
942 for (int i = -1, len = java_lang_invoke_MethodType::ptype_count(method_type()); i < len; i++) {
943 oop ptype = (i == -1
944 ? java_lang_invoke_MethodType::rtype(method_type())
945 : java_lang_invoke_MethodType::ptype(method_type(), i));
946 klassOop klass = check_non_bcp_klass(java_lang_Class::as_klassOop(ptype));
947 if (klass != NULL) {
948 if (extra_klasses == NULL)
949 extra_klasses = new GrowableArray<KlassHandle>(len+1);
950 bool dup = false;
951 for (int j = 0; j < extra_klasses->length(); j++) {
952 if (extra_klasses->at(j) == klass) { dup = true; break; }
953 }
954 if (!dup)
955 extra_klasses->append(KlassHandle(THREAD, klass));
956 }
957 }
958
959 int extra_klass_count = (extra_klasses == NULL ? 0 : extra_klasses->length());
960 int cp_length = _imcp_limit + extra_klass_count;
961 constantPoolHandle cp;
962 {
963 constantPoolOop cp_oop = oopFactory::new_constantPool(cp_length, IsSafeConc, CHECK_(empty));
964 cp = constantPoolHandle(THREAD, cp_oop);
965 }
966 cp->symbol_at_put(_imcp_invoke_name, name);
967 cp->symbol_at_put(_imcp_invoke_signature, signature);
968 cp->string_at_put(_imcp_method_type_value, Universe::the_null_string());
969 for (int j = 0; j < extra_klass_count; j++) {
970 KlassHandle klass = extra_klasses->at(j);
971 cp->klass_at_put(_imcp_limit + j, klass());
972 }
973 cp->set_preresolution();
974 cp->set_pool_holder(holder());
975
976 // set up the fancy stuff:
977 cp->pseudo_string_at_put(_imcp_method_type_value, method_type());
978 methodHandle m;
979 {
980 int flags_bits = (JVM_MH_INVOKE_BITS | JVM_ACC_PUBLIC | JVM_ACC_FINAL);
981 methodOop m_oop = oopFactory::new_method(0, accessFlags_from(flags_bits),
982 0, 0, 0, IsSafeConc, CHECK_(empty));
983 m = methodHandle(THREAD, m_oop);
984 }
985 m->set_constants(cp());
986 m->set_name_index(_imcp_invoke_name);
987 m->set_signature_index(_imcp_invoke_signature);
988 assert(is_method_handle_invoke_name(m->name()), "");
989 assert(m->signature() == signature, "");
990 assert(m->is_method_handle_invoke(), "");
991 #ifdef CC_INTERP
992 ResultTypeFinder rtf(signature);
993 m->set_result_index(rtf.type());
994 #endif
995 m->compute_size_of_parameters(THREAD);
996 m->set_exception_table(Universe::the_empty_int_array());
997 m->init_intrinsic_id();
998 assert(m->intrinsic_id() == vmIntrinsics::_invokeExact ||
999 m->intrinsic_id() == vmIntrinsics::_invokeGeneric, "must be an invoker");
1000
1001 // Finally, set up its entry points.
1002 assert(m->method_handle_type() == method_type(), "");
1003 assert(m->can_be_statically_bound(), "");
1004 m->set_vtable_index(methodOopDesc::nonvirtual_vtable_index);
1005 m->link_method(m, CHECK_(empty));
1006
1007 #ifdef ASSERT
1008 // Make sure the pointer chase works.
1009 address p = (address) m();
1010 for (jint* pchase = method_type_offsets_chain(); (*pchase) != -1; pchase++) {
1011 p = *(address*)(p + (*pchase));
1012 }
1013 assert((oop)p == method_type(), "pointer chase is correct");
1014 #endif
1015
1016 if (TraceMethodHandles && (Verbose || WizardMode))
1017 m->print_on(tty);
1018
1019 return m;
1020 }
1021
1022 klassOop methodOopDesc::check_non_bcp_klass(klassOop klass) {
1023 if (klass != NULL && Klass::cast(klass)->class_loader() != NULL) {
1024 if (Klass::cast(klass)->oop_is_objArray())
1025 klass = objArrayKlass::cast(klass)->bottom_klass();
1026 return klass;
1027 }
1028 return NULL;
1029 }
1030
1031
1032 methodHandle methodOopDesc:: clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1033 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1034 // Code below does not work for native methods - they should never get rewritten anyway
1035 assert(!m->is_native(), "cannot rewrite native methods");
1036 // Allocate new methodOop
1037 AccessFlags flags = m->access_flags();
1038 int checked_exceptions_len = m->checked_exceptions_length();
1039 int localvariable_len = m->localvariable_table_length();
1040 // Allocate newm_oop with the is_conc_safe parameter set
1041 // to IsUnsafeConc to indicate that newm_oop is not yet
1042 // safe for concurrent processing by a GC.
1043 methodOop newm_oop = oopFactory::new_method(new_code_length,
1044 flags,
1045 new_compressed_linenumber_size,
1046 localvariable_len,
1047 checked_exceptions_len,
1048 IsUnsafeConc,
1049 CHECK_(methodHandle()));
1050 methodHandle newm (THREAD, newm_oop);
1051 NOT_PRODUCT(int nmsz = newm->is_parsable() ? newm->size() : -1;)
1052 int new_method_size = newm->method_size();
1053 // Create a shallow copy of methodOopDesc part, but be careful to preserve the new constMethodOop
1054 constMethodOop newcm = newm->constMethod();
1055 NOT_PRODUCT(int ncmsz = newcm->is_parsable() ? newcm->size() : -1;)
1056 int new_const_method_size = newm->constMethod()->object_size();
1057
1058 memcpy(newm(), m(), sizeof(methodOopDesc));
1059 // Create shallow copy of constMethodOopDesc, but be careful to preserve the methodOop
1060 // is_conc_safe is set to false because that is the value of
1061 // is_conc_safe initialzied into newcm and the copy should
1062 // not overwrite that value. During the window during which it is
1063 // tagged as unsafe, some extra work could be needed during precleaning
1064 // or concurrent marking but those phases will be correct. Setting and
1065 // resetting is done in preference to a careful copying into newcm to
1066 // avoid having to know the precise layout of a constMethodOop.
1067 m->constMethod()->set_is_conc_safe(oopDesc::IsUnsafeConc);
1068 assert(m->constMethod()->is_parsable(), "Should remain parsable");
1069
1070 // NOTE: this is a reachable object that transiently signals "conc_unsafe"
1071 // However, no allocations are done during this window
1072 // during which it is tagged conc_unsafe, so we are assured that any concurrent
1073 // thread will not wait forever for the object to revert to "conc_safe".
1074 // Further, any such conc_unsafe object will indicate a stable size
1075 // through the transition.
1076 memcpy(newcm, m->constMethod(), sizeof(constMethodOopDesc));
1077 m->constMethod()->set_is_conc_safe(oopDesc::IsSafeConc);
1078 assert(m->constMethod()->is_parsable(), "Should remain parsable");
1079
1080 // Reset correct method/const method, method size, and parameter info
1081 newm->set_constMethod(newcm);
1082 newm->constMethod()->set_code_size(new_code_length);
1083 newm->constMethod()->set_constMethod_size(new_const_method_size);
1084 newm->set_method_size(new_method_size);
1085 assert(newm->code_size() == new_code_length, "check");
1086 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1087 assert(newm->localvariable_table_length() == localvariable_len, "check");
1088 // Copy new byte codes
1089 memcpy(newm->code_base(), new_code, new_code_length);
1090 // Copy line number table
1091 if (new_compressed_linenumber_size > 0) {
1092 memcpy(newm->compressed_linenumber_table(),
1093 new_compressed_linenumber_table,
1094 new_compressed_linenumber_size);
1095 }
1096 // Copy checked_exceptions
1097 if (checked_exceptions_len > 0) {
1098 memcpy(newm->checked_exceptions_start(),
1099 m->checked_exceptions_start(),
1100 checked_exceptions_len * sizeof(CheckedExceptionElement));
1101 }
1102 // Copy local variable number table
1103 if (localvariable_len > 0) {
1104 memcpy(newm->localvariable_table_start(),
1105 m->localvariable_table_start(),
1106 localvariable_len * sizeof(LocalVariableTableElement));
1107 }
1108
1109 // Only set is_conc_safe to true when changes to newcm are
1110 // complete.
1111 assert(!newm->is_parsable() || nmsz < 0 || newm->size() == nmsz, "newm->size() inconsistency");
1112 assert(!newcm->is_parsable() || ncmsz < 0 || newcm->size() == ncmsz, "newcm->size() inconsistency");
1113 newcm->set_is_conc_safe(true);
1114 return newm;
1115 }
1116
1117 vmSymbols::SID methodOopDesc::klass_id_for_intrinsics(klassOop holder) {
1118 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1119 // because we are not loading from core libraries
1120 if (instanceKlass::cast(holder)->class_loader() != NULL)
1121 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1122
1123 // see if the klass name is well-known:
1124 Symbol* klass_name = instanceKlass::cast(holder)->name();
1125 return vmSymbols::find_sid(klass_name);
1126 }
1127
1128 void methodOopDesc::init_intrinsic_id() {
1129 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1130 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1131 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1132 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1133
1134 // the klass name is well-known:
1135 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1136 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1137
1138 // ditto for method and signature:
1139 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1140 if (name_id == vmSymbols::NO_SID) return;
1141 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1142 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1143 && sig_id == vmSymbols::NO_SID) return;
1144 jshort flags = access_flags().as_short();
1145
1146 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1147 if (id != vmIntrinsics::_none) {
1148 set_intrinsic_id(id);
1149 return;
1150 }
1151
1152 // A few slightly irregular cases:
1153 switch (klass_id) {
1154 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1155 // Second chance: check in regular Math.
1156 switch (name_id) {
1157 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1158 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1159 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1160 // pretend it is the corresponding method in the non-strict class:
1161 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1162 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1163 break;
1164 }
1165 break;
1166
1167 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1168 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1169 if (is_static() || !is_native()) break;
1170 switch (name_id) {
1171 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeGeneric_name):
1172 if (!AllowInvokeGeneric) break;
1173 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name):
1174 id = vmIntrinsics::_invokeGeneric;
1175 break;
1176 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeExact_name):
1177 id = vmIntrinsics::_invokeExact;
1178 break;
1179 }
1180 break;
1181 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InvokeDynamic):
1182 if (!is_static() || !is_native()) break;
1183 id = vmIntrinsics::_invokeDynamic;
1184 break;
1185 }
1186
1187 if (id != vmIntrinsics::_none) {
1188 // Set up its iid. It is an alias method.
1189 set_intrinsic_id(id);
1190 return;
1191 }
1192 }
1193
1194 // These two methods are static since a GC may move the methodOopDesc
1195 bool methodOopDesc::load_signature_classes(methodHandle m, TRAPS) {
1196 bool sig_is_loaded = true;
1197 Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader());
1198 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain());
1199 ResourceMark rm(THREAD);
1200 Symbol* signature = m->signature();
1201 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1202 if (ss.is_object()) {
1203 Symbol* sym = ss.as_symbol(CHECK_(false));
1204 Symbol* name = sym;
1205 klassOop klass = SystemDictionary::resolve_or_null(name, class_loader,
1206 protection_domain, THREAD);
1207 // We are loading classes eagerly. If a ClassNotFoundException or
1208 // a LinkageError was generated, be sure to ignore it.
1209 if (HAS_PENDING_EXCEPTION) {
1210 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1211 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1212 CLEAR_PENDING_EXCEPTION;
1213 } else {
1214 return false;
1215 }
1216 }
1217 if( klass == NULL) { sig_is_loaded = false; }
1218 }
1219 }
1220 return sig_is_loaded;
1221 }
1222
1223 bool methodOopDesc::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1224 Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader());
1225 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain());
1226 ResourceMark rm(THREAD);
1227 Symbol* signature = m->signature();
1228 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1229 if (ss.type() == T_OBJECT) {
1230 Symbol* name = ss.as_symbol_or_null();
1231 if (name == NULL) return true;
1232 klassOop klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1233 if (klass == NULL) return true;
1234 }
1235 }
1236 return false;
1237 }
1238
1239 // Exposed so field engineers can debug VM
1240 void methodOopDesc::print_short_name(outputStream* st) {
1241 ResourceMark rm;
1242 #ifdef PRODUCT
1243 st->print(" %s::", method_holder()->klass_part()->external_name());
1244 #else
1245 st->print(" %s::", method_holder()->klass_part()->internal_name());
1246 #endif
1247 name()->print_symbol_on(st);
1248 if (WizardMode) signature()->print_symbol_on(st);
1249 }
1250
1251 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1252 static void reorder_based_on_method_index(objArrayOop methods,
1253 objArrayOop annotations,
1254 GrowableArray<oop>* temp_array) {
1255 if (annotations == NULL) {
1256 return;
1257 }
1258
1259 int length = methods->length();
1260 int i;
1261 // Copy to temp array
1262 temp_array->clear();
1263 for (i = 0; i < length; i++) {
1264 temp_array->append(annotations->obj_at(i));
1265 }
1266
1267 // Copy back using old method indices
1268 for (i = 0; i < length; i++) {
1269 methodOop m = (methodOop) methods->obj_at(i);
1270 annotations->obj_at_put(i, temp_array->at(m->method_idnum()));
1271 }
1272 }
1273
1274 // Comparer for sorting an object array containing
1275 // methodOops.
1276 // Used non-template method_comparator methods since
1277 // Visual Studio 2003 compiler generates incorrect
1278 // optimized code for it.
1279 static int method_comparator_narrowOop(narrowOop a, narrowOop b) {
1280 methodOop m = (methodOop)oopDesc::decode_heap_oop_not_null(a);
1281 methodOop n = (methodOop)oopDesc::decode_heap_oop_not_null(b);
1282 return m->name()->fast_compare(n->name());
1283 }
1284 static int method_comparator_oop(oop a, oop b) {
1285 methodOop m = (methodOop)a;
1286 methodOop n = (methodOop)b;
1287 return m->name()->fast_compare(n->name());
1288 }
1289
1290 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1291 void methodOopDesc::sort_methods(objArrayOop methods,
1292 objArrayOop methods_annotations,
1293 objArrayOop methods_parameter_annotations,
1294 objArrayOop methods_default_annotations,
1295 bool idempotent) {
1296 int length = methods->length();
1297 if (length > 1) {
1298 bool do_annotations = false;
1299 if (methods_annotations != NULL ||
1300 methods_parameter_annotations != NULL ||
1301 methods_default_annotations != NULL) {
1302 do_annotations = true;
1303 }
1304 if (do_annotations) {
1305 // Remember current method ordering so we can reorder annotations
1306 for (int i = 0; i < length; i++) {
1307 methodOop m = (methodOop) methods->obj_at(i);
1308 m->set_method_idnum(i);
1309 }
1310 }
1311 {
1312 No_Safepoint_Verifier nsv;
1313 if (UseCompressedOops) {
1314 QuickSort::sort<narrowOop>((narrowOop*)(methods->base()), length, method_comparator_narrowOop, idempotent);
1315 } else {
1316 QuickSort::sort<oop>((oop*)(methods->base()), length, method_comparator_oop, idempotent);
1317 }
1318 if (UseConcMarkSweepGC) {
1319 // For CMS we need to dirty the cards for the array
1320 BarrierSet* bs = Universe::heap()->barrier_set();
1321 assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt");
1322 bs->write_ref_array(methods->base(), length);
1323 }
1324 }
1325
1326 // Sort annotations if necessary
1327 assert(methods_annotations == NULL || methods_annotations->length() == methods->length(), "");
1328 assert(methods_parameter_annotations == NULL || methods_parameter_annotations->length() == methods->length(), "");
1329 assert(methods_default_annotations == NULL || methods_default_annotations->length() == methods->length(), "");
1330 if (do_annotations) {
1331 ResourceMark rm;
1332 // Allocate temporary storage
1333 GrowableArray<oop>* temp_array = new GrowableArray<oop>(length);
1334 reorder_based_on_method_index(methods, methods_annotations, temp_array);
1335 reorder_based_on_method_index(methods, methods_parameter_annotations, temp_array);
1336 reorder_based_on_method_index(methods, methods_default_annotations, temp_array);
1337 }
1338
1339 // Reset method ordering
1340 for (int i = 0; i < length; i++) {
1341 methodOop m = (methodOop) methods->obj_at(i);
1342 m->set_method_idnum(i);
1343 }
1344 }
1345 }
1346
1347
1348 //-----------------------------------------------------------------------------------
1349 // Non-product code
1350
1351 #ifndef PRODUCT
1352 class SignatureTypePrinter : public SignatureTypeNames {
1353 private:
1354 outputStream* _st;
1355 bool _use_separator;
1356
1357 void type_name(const char* name) {
1358 if (_use_separator) _st->print(", ");
1359 _st->print(name);
1360 _use_separator = true;
1361 }
1362
1363 public:
1364 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1365 _st = st;
1366 _use_separator = false;
1367 }
1368
1369 void print_parameters() { _use_separator = false; iterate_parameters(); }
1370 void print_returntype() { _use_separator = false; iterate_returntype(); }
1371 };
1372
1373
1374 void methodOopDesc::print_name(outputStream* st) {
1375 Thread *thread = Thread::current();
1376 ResourceMark rm(thread);
1377 SignatureTypePrinter sig(signature(), st);
1378 st->print("%s ", is_static() ? "static" : "virtual");
1379 sig.print_returntype();
1380 st->print(" %s.", method_holder()->klass_part()->internal_name());
1381 name()->print_symbol_on(st);
1382 st->print("(");
1383 sig.print_parameters();
1384 st->print(")");
1385 }
1386
1387
1388 void methodOopDesc::print_codes_on(outputStream* st) const {
1389 print_codes_on(0, code_size(), st);
1390 }
1391
1392 void methodOopDesc::print_codes_on(int from, int to, outputStream* st) const {
1393 Thread *thread = Thread::current();
1394 ResourceMark rm(thread);
1395 methodHandle mh (thread, (methodOop)this);
1396 BytecodeStream s(mh);
1397 s.set_interval(from, to);
1398 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1399 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1400 }
1401 #endif // not PRODUCT
1402
1403
1404 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1405 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1406 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1407 // as end-of-stream terminator.
1408
1409 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1410 // bci and line number does not compress into single byte.
1411 // Write out escape character and use regular compression for bci and line number.
1412 write_byte((jubyte)0xFF);
1413 write_signed_int(bci_delta);
1414 write_signed_int(line_delta);
1415 }
1416
1417 // See comment in methodOop.hpp which explains why this exists.
1418 #if defined(_M_AMD64) && _MSC_VER >= 1400
1419 #pragma optimize("", off)
1420 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1421 write_pair_inline(bci, line);
1422 }
1423 #pragma optimize("", on)
1424 #endif
1425
1426 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1427 _bci = 0;
1428 _line = 0;
1429 };
1430
1431
1432 bool CompressedLineNumberReadStream::read_pair() {
1433 jubyte next = read_byte();
1434 // Check for terminator
1435 if (next == 0) return false;
1436 if (next == 0xFF) {
1437 // Escape character, regular compression used
1438 _bci += read_signed_int();
1439 _line += read_signed_int();
1440 } else {
1441 // Single byte compression used
1442 _bci += next >> 3;
1443 _line += next & 0x7;
1444 }
1445 return true;
1446 }
1447
1448
1449 Bytecodes::Code methodOopDesc::orig_bytecode_at(int bci) const {
1450 BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints();
1451 for (; bp != NULL; bp = bp->next()) {
1452 if (bp->match(this, bci)) {
1453 return bp->orig_bytecode();
1454 }
1455 }
1456 ShouldNotReachHere();
1457 return Bytecodes::_shouldnotreachhere;
1458 }
1459
1460 void methodOopDesc::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1461 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1462 BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints();
1463 for (; bp != NULL; bp = bp->next()) {
1464 if (bp->match(this, bci)) {
1465 bp->set_orig_bytecode(code);
1466 // and continue, in case there is more than one
1467 }
1468 }
1469 }
1470
1471 void methodOopDesc::set_breakpoint(int bci) {
1472 instanceKlass* ik = instanceKlass::cast(method_holder());
1473 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1474 bp->set_next(ik->breakpoints());
1475 ik->set_breakpoints(bp);
1476 // do this last:
1477 bp->set(this);
1478 }
1479
1480 static void clear_matches(methodOop m, int bci) {
1481 instanceKlass* ik = instanceKlass::cast(m->method_holder());
1482 BreakpointInfo* prev_bp = NULL;
1483 BreakpointInfo* next_bp;
1484 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1485 next_bp = bp->next();
1486 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1487 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1488 // do this first:
1489 bp->clear(m);
1490 // unhook it
1491 if (prev_bp != NULL)
1492 prev_bp->set_next(next_bp);
1493 else
1494 ik->set_breakpoints(next_bp);
1495 delete bp;
1496 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1497 // at same location. So we have multiple matching (method_index and bci)
1498 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1499 // breakpoint for clear_breakpoint request and keep all other method versions
1500 // BreakpointInfo for future clear_breakpoint request.
1501 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1502 // which is being called when class is unloaded. We delete all the Breakpoint
1503 // information for all versions of method. We may not correctly restore the original
1504 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1505 // so these methods won't be used anymore.
1506 if (bci >= 0) {
1507 break;
1508 }
1509 } else {
1510 // This one is a keeper.
1511 prev_bp = bp;
1512 }
1513 }
1514 }
1515
1516 void methodOopDesc::clear_breakpoint(int bci) {
1517 assert(bci >= 0, "");
1518 clear_matches(this, bci);
1519 }
1520
1521 void methodOopDesc::clear_all_breakpoints() {
1522 clear_matches(this, -1);
1523 }
1524
1525
1526 int methodOopDesc::invocation_count() {
1527 if (TieredCompilation) {
1528 const methodDataOop mdo = method_data();
1529 if (invocation_counter()->carry() || ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1530 return InvocationCounter::count_limit;
1531 } else {
1532 return invocation_counter()->count() + ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1533 }
1534 } else {
1535 return invocation_counter()->count();
1536 }
1537 }
1538
1539 int methodOopDesc::backedge_count() {
1540 if (TieredCompilation) {
1541 const methodDataOop mdo = method_data();
1542 if (backedge_counter()->carry() || ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1543 return InvocationCounter::count_limit;
1544 } else {
1545 return backedge_counter()->count() + ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1546 }
1547 } else {
1548 return backedge_counter()->count();
1549 }
1550 }
1551
1552 int methodOopDesc::highest_comp_level() const {
1553 methodDataOop mdo = method_data();
1554 if (mdo != NULL) {
1555 return mdo->highest_comp_level();
1556 } else {
1557 return CompLevel_none;
1558 }
1559 }
1560
1561 int methodOopDesc::highest_osr_comp_level() const {
1562 methodDataOop mdo = method_data();
1563 if (mdo != NULL) {
1564 return mdo->highest_osr_comp_level();
1565 } else {
1566 return CompLevel_none;
1567 }
1568 }
1569
1570 void methodOopDesc::set_highest_comp_level(int level) {
1571 methodDataOop mdo = method_data();
1572 if (mdo != NULL) {
1573 mdo->set_highest_comp_level(level);
1574 }
1575 }
1576
1577 void methodOopDesc::set_highest_osr_comp_level(int level) {
1578 methodDataOop mdo = method_data();
1579 if (mdo != NULL) {
1580 mdo->set_highest_osr_comp_level(level);
1581 }
1582 }
1583
1584 BreakpointInfo::BreakpointInfo(methodOop m, int bci) {
1585 _bci = bci;
1586 _name_index = m->name_index();
1587 _signature_index = m->signature_index();
1588 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1589 if (_orig_bytecode == Bytecodes::_breakpoint)
1590 _orig_bytecode = m->orig_bytecode_at(_bci);
1591 _next = NULL;
1592 }
1593
1594 void BreakpointInfo::set(methodOop method) {
1595 #ifdef ASSERT
1596 {
1597 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1598 if (code == Bytecodes::_breakpoint)
1599 code = method->orig_bytecode_at(_bci);
1600 assert(orig_bytecode() == code, "original bytecode must be the same");
1601 }
1602 #endif
1603 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1604 method->incr_number_of_breakpoints();
1605 SystemDictionary::notice_modification();
1606 {
1607 // Deoptimize all dependents on this method
1608 Thread *thread = Thread::current();
1609 HandleMark hm(thread);
1610 methodHandle mh(thread, method);
1611 Universe::flush_dependents_on_method(mh);
1612 }
1613 }
1614
1615 void BreakpointInfo::clear(methodOop method) {
1616 *method->bcp_from(_bci) = orig_bytecode();
1617 assert(method->number_of_breakpoints() > 0, "must not go negative");
1618 method->decr_number_of_breakpoints();
1619 }