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/metadataFactory.hpp"
37 #include "memory/oopFactory.hpp"
38 #include "oops/constMethod.hpp"
39 #include "oops/methodData.hpp"
40 #include "oops/method.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "oops/symbol.hpp"
43 #include "prims/jvmtiExport.hpp"
44 #include "prims/jvmtiRedefineClasses.hpp"
45 #include "prims/methodHandles.hpp"
46 #include "prims/nativeLookup.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/compilationPolicy.hpp"
49 #include "runtime/frame.inline.hpp"
50 #include "runtime/handles.inline.hpp"
51 #include "runtime/relocator.hpp"
52 #include "runtime/sharedRuntime.hpp"
53 #include "runtime/signature.hpp"
54 #include "utilities/quickSort.hpp"
55 #include "utilities/xmlstream.hpp"
56
57
58 // Implementation of Method
59
60 Method* Method::allocate(ClassLoaderData* loader_data,
61 int byte_code_size,
62 AccessFlags access_flags,
63 int compressed_line_number_size,
64 int localvariable_table_length,
65 int exception_table_length,
66 int checked_exceptions_length,
67 int method_parameters_length,
68 u2 generic_signature_index,
69 ConstMethod::MethodType method_type,
70 TRAPS) {
71 assert(!access_flags.is_native() || byte_code_size == 0,
72 "native methods should not contain byte codes");
73 ConstMethod* cm = ConstMethod::allocate(loader_data,
74 byte_code_size,
75 compressed_line_number_size,
76 localvariable_table_length,
77 exception_table_length,
78 checked_exceptions_length,
79 method_parameters_length,
80 generic_signature_index,
81 method_type,
82 CHECK_NULL);
83
84 int size = Method::size(access_flags.is_native());
85
86 return new (loader_data, size, false, THREAD) Method(cm, access_flags, size);
87 }
88
89 Method::Method(ConstMethod* xconst,
90 AccessFlags access_flags, int size) {
91 No_Safepoint_Verifier no_safepoint;
92 set_constMethod(xconst);
93 set_access_flags(access_flags);
94 set_method_size(size);
95 set_name_index(0);
96 set_signature_index(0);
97 #ifdef CC_INTERP
98 set_result_index(T_VOID);
99 #endif
100 set_constants(NULL);
101 set_max_stack(0);
102 set_max_locals(0);
103 set_intrinsic_id(vmIntrinsics::_none);
104 set_jfr_towrite(false);
105 set_method_data(NULL);
106 set_interpreter_throwout_count(0);
107 set_vtable_index(Method::garbage_vtable_index);
108
109 // Fix and bury in Method*
110 set_interpreter_entry(NULL); // sets i2i entry and from_int
111 set_adapter_entry(NULL);
112 clear_code(); // from_c/from_i get set to c2i/i2i
113
114 if (access_flags.is_native()) {
115 clear_native_function();
116 set_signature_handler(NULL);
117 }
118
119 NOT_PRODUCT(set_compiled_invocation_count(0);)
120 set_interpreter_invocation_count(0);
121 invocation_counter()->init();
122 backedge_counter()->init();
123 clear_number_of_breakpoints();
124
125 #ifdef TIERED
126 set_rate(0);
127 set_prev_event_count(0);
128 set_prev_time(0);
129 #endif
130 }
131
132 // Release Method*. The nmethod will be gone when we get here because
133 // we've walked the code cache.
134 void Method::deallocate_contents(ClassLoaderData* loader_data) {
135 MetadataFactory::free_metadata(loader_data, constMethod());
136 set_constMethod(NULL);
137 MetadataFactory::free_metadata(loader_data, method_data());
138 set_method_data(NULL);
139 // The nmethod will be gone when we get here.
140 if (code() != NULL) _code = NULL;
141 }
142
143 address Method::get_i2c_entry() {
144 assert(_adapter != NULL, "must have");
145 return _adapter->get_i2c_entry();
146 }
147
148 address Method::get_c2i_entry() {
149 assert(_adapter != NULL, "must have");
150 return _adapter->get_c2i_entry();
151 }
152
153 address Method::get_c2i_unverified_entry() {
154 assert(_adapter != NULL, "must have");
155 return _adapter->get_c2i_unverified_entry();
156 }
157
158 char* Method::name_and_sig_as_C_string() const {
159 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
160 }
161
162 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
163 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
164 }
165
166 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
167 const char* klass_name = klass->external_name();
168 int klass_name_len = (int)strlen(klass_name);
169 int method_name_len = method_name->utf8_length();
170 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
171 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
172 strcpy(dest, klass_name);
173 dest[klass_name_len] = '.';
174 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
175 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
176 dest[len] = 0;
177 return dest;
178 }
179
180 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
181 Symbol* klass_name = klass->name();
182 klass_name->as_klass_external_name(buf, size);
183 int len = (int)strlen(buf);
184
185 if (len < size - 1) {
186 buf[len++] = '.';
187
188 method_name->as_C_string(&(buf[len]), size - len);
189 len = (int)strlen(buf);
190
191 signature->as_C_string(&(buf[len]), size - len);
192 }
193
194 return buf;
195 }
196
197 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) {
198 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
199 // access exception table
200 ExceptionTable table(mh());
201 int length = table.length();
202 // iterate through all entries sequentially
203 constantPoolHandle pool(THREAD, mh->constants());
204 for (int i = 0; i < length; i ++) {
205 //reacquire the table in case a GC happened
206 ExceptionTable table(mh());
207 int beg_bci = table.start_pc(i);
208 int end_bci = table.end_pc(i);
209 assert(beg_bci <= end_bci, "inconsistent exception table");
210 if (beg_bci <= throw_bci && throw_bci < end_bci) {
211 // exception handler bci range covers throw_bci => investigate further
212 int handler_bci = table.handler_pc(i);
213 int klass_index = table.catch_type_index(i);
214 if (klass_index == 0) {
215 return handler_bci;
216 } else if (ex_klass.is_null()) {
217 return handler_bci;
218 } else {
219 // we know the exception class => get the constraint class
220 // this may require loading of the constraint class; if verification
221 // fails or some other exception occurs, return handler_bci
222 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
223 KlassHandle klass = KlassHandle(THREAD, k);
224 assert(klass.not_null(), "klass not loaded");
225 if (ex_klass->is_subtype_of(klass())) {
226 return handler_bci;
227 }
228 }
229 }
230 }
231
232 return -1;
233 }
234
235 void Method::mask_for(int bci, InterpreterOopMap* mask) {
236
237 Thread* myThread = Thread::current();
238 methodHandle h_this(myThread, this);
239 #ifdef ASSERT
240 bool has_capability = myThread->is_VM_thread() ||
241 myThread->is_ConcurrentGC_thread() ||
242 myThread->is_GC_task_thread();
243
244 if (!has_capability) {
245 if (!VerifyStack && !VerifyLastFrame) {
246 // verify stack calls this outside VM thread
247 warning("oopmap should only be accessed by the "
248 "VM, GC task or CMS threads (or during debugging)");
249 InterpreterOopMap local_mask;
250 method_holder()->mask_for(h_this, bci, &local_mask);
251 local_mask.print();
252 }
253 }
254 #endif
255 method_holder()->mask_for(h_this, bci, mask);
256 return;
257 }
258
259
260 int Method::bci_from(address bcp) const {
261 #ifdef ASSERT
262 { ResourceMark rm;
263 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
264 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string()));
265 }
266 #endif
267 return bcp - code_base();
268 }
269
270
271 // Return (int)bcx if it appears to be a valid BCI.
272 // Return bci_from((address)bcx) if it appears to be a valid BCP.
273 // Return -1 otherwise.
274 // Used by profiling code, when invalid data is a possibility.
275 // The caller is responsible for validating the Method* itself.
276 int Method::validate_bci_from_bcx(intptr_t bcx) const {
277 // keep bci as -1 if not a valid bci
278 int bci = -1;
279 if (bcx == 0 || (address)bcx == code_base()) {
280 // code_size() may return 0 and we allow 0 here
281 // the method may be native
282 bci = 0;
283 } else if (frame::is_bci(bcx)) {
284 if (bcx < code_size()) {
285 bci = (int)bcx;
286 }
287 } else if (contains((address)bcx)) {
288 bci = (address)bcx - code_base();
289 }
290 // Assert that if we have dodged any asserts, bci is negative.
291 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
292 return bci;
293 }
294
295 address Method::bcp_from(int bci) const {
296 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci");
297 address bcp = code_base() + bci;
298 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
299 return bcp;
300 }
301
302
303 int Method::size(bool is_native) {
304 // If native, then include pointers for native_function and signature_handler
305 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
306 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
307 return align_object_size(header_size() + extra_words);
308 }
309
310
311 Symbol* Method::klass_name() const {
312 Klass* k = method_holder();
313 assert(k->is_klass(), "must be klass");
314 InstanceKlass* ik = (InstanceKlass*) k;
315 return ik->name();
316 }
317
318
319 void Method::set_interpreter_kind() {
320 int kind = Interpreter::method_kind(this);
321 assert(kind != Interpreter::invalid,
322 "interpreter entry must be valid");
323 set_interpreter_kind(kind);
324 }
325
326
327 // Attempt to return method oop to original state. Clear any pointers
328 // (to objects outside the shared spaces). We won't be able to predict
329 // where they should point in a new JVM. Further initialize some
330 // entries now in order allow them to be write protected later.
331
332 void Method::remove_unshareable_info() {
333 unlink_method();
334 set_interpreter_kind();
335 }
336
337
338 bool Method::was_executed_more_than(int n) {
339 // Invocation counter is reset when the Method* is compiled.
340 // If the method has compiled code we therefore assume it has
341 // be excuted more than n times.
342 if (is_accessor() || is_empty_method() || (code() != NULL)) {
343 // interpreter doesn't bump invocation counter of trivial methods
344 // compiler does not bump invocation counter of compiled methods
345 return true;
346 }
347 else if (_invocation_counter.carry() || (method_data() != NULL && method_data()->invocation_counter()->carry())) {
348 // The carry bit is set when the counter overflows and causes
349 // a compilation to occur. We don't know how many times
350 // the counter has been reset, so we simply assume it has
351 // been executed more than n times.
352 return true;
353 } else {
354 return invocation_count() > n;
355 }
356 }
357
358 #ifndef PRODUCT
359 void Method::print_invocation_count() {
360 if (is_static()) tty->print("static ");
361 if (is_final()) tty->print("final ");
362 if (is_synchronized()) tty->print("synchronized ");
363 if (is_native()) tty->print("native ");
364 method_holder()->name()->print_symbol_on(tty);
365 tty->print(".");
366 name()->print_symbol_on(tty);
367 signature()->print_symbol_on(tty);
368
369 if (WizardMode) {
370 // dump the size of the byte codes
371 tty->print(" {%d}", code_size());
372 }
373 tty->cr();
374
375 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
376 tty->print_cr (" invocation_counter: %8d ", invocation_count());
377 tty->print_cr (" backedge_counter: %8d ", backedge_count());
378 if (CountCompiledCalls) {
379 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
380 }
381
382 }
383 #endif
384
385 // Build a MethodData* object to hold information about this method
386 // collected in the interpreter.
387 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
388 // Do not profile method if current thread holds the pending list lock,
389 // which avoids deadlock for acquiring the MethodData_lock.
390 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
391 return;
392 }
393
394 // Grab a lock here to prevent multiple
395 // MethodData*s from being created.
396 MutexLocker ml(MethodData_lock, THREAD);
397 if (method->method_data() == NULL) {
398 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
399 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);
400 method->set_method_data(method_data);
401 if (PrintMethodData && (Verbose || WizardMode)) {
402 ResourceMark rm(THREAD);
403 tty->print("build_interpreter_method_data for ");
404 method->print_name(tty);
405 tty->cr();
406 // At the end of the run, the MDO, full of data, will be dumped.
407 }
408 }
409 }
410
411 void Method::cleanup_inline_caches() {
412 // The current system doesn't use inline caches in the interpreter
413 // => nothing to do (keep this method around for future use)
414 }
415
416
417 int Method::extra_stack_words() {
418 // not an inline function, to avoid a header dependency on Interpreter
419 return extra_stack_entries() * Interpreter::stackElementSize;
420 }
421
422
423 void Method::compute_size_of_parameters(Thread *thread) {
424 ArgumentSizeComputer asc(signature());
425 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
426 }
427
428 #ifdef CC_INTERP
429 void Method::set_result_index(BasicType type) {
430 _result_index = Interpreter::BasicType_as_index(type);
431 }
432 #endif
433
434 BasicType Method::result_type() const {
435 ResultTypeFinder rtf(signature());
436 return rtf.type();
437 }
438
439
440 bool Method::is_empty_method() const {
441 return code_size() == 1
442 && *code_base() == Bytecodes::_return;
443 }
444
445
446 bool Method::is_vanilla_constructor() const {
447 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
448 // which only calls the superclass vanilla constructor and possibly does stores of
449 // zero constants to local fields:
450 //
451 // aload_0
452 // invokespecial
453 // indexbyte1
454 // indexbyte2
455 //
456 // followed by an (optional) sequence of:
457 //
458 // aload_0
459 // aconst_null / iconst_0 / fconst_0 / dconst_0
460 // putfield
461 // indexbyte1
462 // indexbyte2
463 //
464 // followed by:
465 //
466 // return
467
468 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
469 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
470 int size = code_size();
471 // Check if size match
472 if (size == 0 || size % 5 != 0) return false;
473 address cb = code_base();
474 int last = size - 1;
475 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
476 // Does not call superclass default constructor
477 return false;
478 }
479 // Check optional sequence
480 for (int i = 4; i < last; i += 5) {
481 if (cb[i] != Bytecodes::_aload_0) return false;
482 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
483 if (cb[i+2] != Bytecodes::_putfield) return false;
484 }
485 return true;
486 }
487
488
489 bool Method::compute_has_loops_flag() {
490 BytecodeStream bcs(this);
491 Bytecodes::Code bc;
492
493 while ((bc = bcs.next()) >= 0) {
494 switch( bc ) {
495 case Bytecodes::_ifeq:
496 case Bytecodes::_ifnull:
497 case Bytecodes::_iflt:
498 case Bytecodes::_ifle:
499 case Bytecodes::_ifne:
500 case Bytecodes::_ifnonnull:
501 case Bytecodes::_ifgt:
502 case Bytecodes::_ifge:
503 case Bytecodes::_if_icmpeq:
504 case Bytecodes::_if_icmpne:
505 case Bytecodes::_if_icmplt:
506 case Bytecodes::_if_icmpgt:
507 case Bytecodes::_if_icmple:
508 case Bytecodes::_if_icmpge:
509 case Bytecodes::_if_acmpeq:
510 case Bytecodes::_if_acmpne:
511 case Bytecodes::_goto:
512 case Bytecodes::_jsr:
513 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
514 break;
515
516 case Bytecodes::_goto_w:
517 case Bytecodes::_jsr_w:
518 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
519 break;
520 }
521 }
522 _access_flags.set_loops_flag_init();
523 return _access_flags.has_loops();
524 }
525
526
527 bool Method::is_final_method() const {
528 // %%% Should return true for private methods also,
529 // since there is no way to override them.
530 return is_final() || method_holder()->is_final();
531 }
532
533
534 bool Method::is_strict_method() const {
535 return is_strict();
536 }
537
538
539 bool Method::can_be_statically_bound() const {
540 if (is_final_method()) return true;
541 return vtable_index() == nonvirtual_vtable_index;
542 }
543
544
545 bool Method::is_accessor() const {
546 if (code_size() != 5) return false;
547 if (size_of_parameters() != 1) return false;
548 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
549 if (java_code_at(1) != Bytecodes::_getfield) return false;
550 if (java_code_at(4) != Bytecodes::_areturn &&
551 java_code_at(4) != Bytecodes::_ireturn ) return false;
552 return true;
553 }
554
555
556 bool Method::is_initializer() const {
557 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
558 }
559
560 bool Method::has_valid_initializer_flags() const {
561 return (is_static() ||
562 method_holder()->major_version() < 51);
563 }
564
565 bool Method::is_static_initializer() const {
566 // For classfiles version 51 or greater, ensure that the clinit method is
567 // static. Non-static methods with the name "<clinit>" are not static
568 // initializers. (older classfiles exempted for backward compatibility)
569 return name() == vmSymbols::class_initializer_name() &&
570 has_valid_initializer_flags();
571 }
572
573
574 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) {
575 int length = this_oop->checked_exceptions_length();
576 if (length == 0) { // common case
577 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
578 } else {
579 methodHandle h_this(THREAD, this_oop);
580 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
581 objArrayHandle mirrors (THREAD, m_oop);
582 for (int i = 0; i < length; i++) {
583 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
584 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
585 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
586 mirrors->obj_at_put(i, k->java_mirror());
587 }
588 return mirrors;
589 }
590 };
591
592
593 int Method::line_number_from_bci(int bci) const {
594 if (bci == SynchronizationEntryBCI) bci = 0;
595 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
596 int best_bci = 0;
597 int best_line = -1;
598
599 if (has_linenumber_table()) {
600 // The line numbers are a short array of 2-tuples [start_pc, line_number].
601 // Not necessarily sorted and not necessarily one-to-one.
602 CompressedLineNumberReadStream stream(compressed_linenumber_table());
603 while (stream.read_pair()) {
604 if (stream.bci() == bci) {
605 // perfect match
606 return stream.line();
607 } else {
608 // update best_bci/line
609 if (stream.bci() < bci && stream.bci() >= best_bci) {
610 best_bci = stream.bci();
611 best_line = stream.line();
612 }
613 }
614 }
615 }
616 return best_line;
617 }
618
619
620 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
621 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
622 Thread *thread = Thread::current();
623 Symbol* klass_name = constants()->klass_name_at(klass_index);
624 Handle loader(thread, method_holder()->class_loader());
625 Handle prot (thread, method_holder()->protection_domain());
626 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
627 } else {
628 return true;
629 }
630 }
631
632
633 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
634 int klass_index = constants()->klass_ref_index_at(refinfo_index);
635 if (must_be_resolved) {
636 // Make sure klass is resolved in constantpool.
637 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
638 }
639 return is_klass_loaded_by_klass_index(klass_index);
640 }
641
642
643 void Method::set_native_function(address function, bool post_event_flag) {
644 assert(function != NULL, "use clear_native_function to unregister natives");
645 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
646 address* native_function = native_function_addr();
647
648 // We can see racers trying to place the same native function into place. Once
649 // is plenty.
650 address current = *native_function;
651 if (current == function) return;
652 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
653 function != NULL) {
654 // native_method_throw_unsatisfied_link_error_entry() should only
655 // be passed when post_event_flag is false.
656 assert(function !=
657 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
658 "post_event_flag mis-match");
659
660 // post the bind event, and possible change the bind function
661 JvmtiExport::post_native_method_bind(this, &function);
662 }
663 *native_function = function;
664 // This function can be called more than once. We must make sure that we always
665 // use the latest registered method -> check if a stub already has been generated.
666 // If so, we have to make it not_entrant.
667 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
668 if (nm != NULL) {
669 nm->make_not_entrant();
670 }
671 }
672
673
674 bool Method::has_native_function() const {
675 if (is_method_handle_intrinsic())
676 return false; // special-cased in SharedRuntime::generate_native_wrapper
677 address func = native_function();
678 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
679 }
680
681
682 void Method::clear_native_function() {
683 // Note: is_method_handle_intrinsic() is allowed here.
684 set_native_function(
685 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
686 !native_bind_event_is_interesting);
687 clear_code();
688 }
689
690 address Method::critical_native_function() {
691 methodHandle mh(this);
692 return NativeLookup::lookup_critical_entry(mh);
693 }
694
695
696 void Method::set_signature_handler(address handler) {
697 address* signature_handler = signature_handler_addr();
698 *signature_handler = handler;
699 }
700
701
702 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report) {
703 if (PrintCompilation && report) {
704 ttyLocker ttyl;
705 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
706 if (comp_level == CompLevel_all) {
707 tty->print("all levels ");
708 } else {
709 tty->print("levels ");
710 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
711 tty->print("%d ", i);
712 }
713 }
714 this->print_short_name(tty);
715 int size = this->code_size();
716 if (size > 0)
717 tty->print(" (%d bytes)", size);
718 tty->cr();
719 }
720 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
721 ttyLocker ttyl;
722 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'",
723 is_osr ? "osr_" : "", os::current_thread_id());
724 xtty->method(this);
725 xtty->stamp();
726 xtty->end_elem();
727 }
728 }
729
730 bool Method::is_not_compilable(int comp_level) const {
731 if (number_of_breakpoints() > 0)
732 return true;
733 if (is_method_handle_intrinsic())
734 return !is_synthetic(); // the generated adapters must be compiled
735 if (comp_level == CompLevel_any)
736 return is_not_c1_compilable() || is_not_c2_compilable();
737 if (is_c1_compile(comp_level))
738 return is_not_c1_compilable();
739 if (is_c2_compile(comp_level))
740 return is_not_c2_compilable();
741 return false;
742 }
743
744 // call this when compiler finds that this method is not compilable
745 void Method::set_not_compilable(int comp_level, bool report) {
746 print_made_not_compilable(comp_level, /*is_osr*/ false, report);
747 if (comp_level == CompLevel_all) {
748 set_not_c1_compilable();
749 set_not_c2_compilable();
750 } else {
751 if (is_c1_compile(comp_level))
752 set_not_c1_compilable();
753 if (is_c2_compile(comp_level))
754 set_not_c2_compilable();
755 }
756 CompilationPolicy::policy()->disable_compilation(this);
757 }
758
759 bool Method::is_not_osr_compilable(int comp_level) const {
760 if (is_not_compilable(comp_level))
761 return true;
762 if (comp_level == CompLevel_any)
763 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
764 if (is_c1_compile(comp_level))
765 return is_not_c1_osr_compilable();
766 if (is_c2_compile(comp_level))
767 return is_not_c2_osr_compilable();
768 return false;
769 }
770
771 void Method::set_not_osr_compilable(int comp_level, bool report) {
772 print_made_not_compilable(comp_level, /*is_osr*/ true, report);
773 if (comp_level == CompLevel_all) {
774 set_not_c1_osr_compilable();
775 set_not_c2_osr_compilable();
776 } else {
777 if (is_c1_compile(comp_level))
778 set_not_c1_osr_compilable();
779 if (is_c2_compile(comp_level))
780 set_not_c2_osr_compilable();
781 }
782 CompilationPolicy::policy()->disable_compilation(this);
783 }
784
785 // Revert to using the interpreter and clear out the nmethod
786 void Method::clear_code() {
787
788 // this may be NULL if c2i adapters have not been made yet
789 // Only should happen at allocate time.
790 if (_adapter == NULL) {
791 _from_compiled_entry = NULL;
792 } else {
793 _from_compiled_entry = _adapter->get_c2i_entry();
794 }
795 OrderAccess::storestore();
796 _from_interpreted_entry = _i2i_entry;
797 OrderAccess::storestore();
798 _code = NULL;
799 }
800
801 // Called by class data sharing to remove any entry points (which are not shared)
802 void Method::unlink_method() {
803 _code = NULL;
804 _i2i_entry = NULL;
805 _from_interpreted_entry = NULL;
806 if (is_native()) {
807 *native_function_addr() = NULL;
808 set_signature_handler(NULL);
809 }
810 NOT_PRODUCT(set_compiled_invocation_count(0);)
811 invocation_counter()->reset();
812 backedge_counter()->reset();
813 _adapter = NULL;
814 _from_compiled_entry = NULL;
815 assert(_method_data == NULL, "unexpected method data?");
816 set_method_data(NULL);
817 set_interpreter_throwout_count(0);
818 set_interpreter_invocation_count(0);
819 }
820
821 // Called when the method_holder is getting linked. Setup entrypoints so the method
822 // is ready to be called from interpreter, compiler, and vtables.
823 void Method::link_method(methodHandle h_method, TRAPS) {
824 // If the code cache is full, we may reenter this function for the
825 // leftover methods that weren't linked.
826 if (_i2i_entry != NULL) return;
827
828 assert(_adapter == NULL, "init'd to NULL" );
829 assert( _code == NULL, "nothing compiled yet" );
830
831 // Setup interpreter entrypoint
832 assert(this == h_method(), "wrong h_method()" );
833 address entry = Interpreter::entry_for_method(h_method);
834 assert(entry != NULL, "interpreter entry must be non-null");
835 // Sets both _i2i_entry and _from_interpreted_entry
836 set_interpreter_entry(entry);
837 if (is_native() && !is_method_handle_intrinsic()) {
838 set_native_function(
839 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
840 !native_bind_event_is_interesting);
841 }
842
843 // Setup compiler entrypoint. This is made eagerly, so we do not need
844 // special handling of vtables. An alternative is to make adapters more
845 // lazily by calling make_adapter() from from_compiled_entry() for the
846 // normal calls. For vtable calls life gets more complicated. When a
847 // call-site goes mega-morphic we need adapters in all methods which can be
848 // called from the vtable. We need adapters on such methods that get loaded
849 // later. Ditto for mega-morphic itable calls. If this proves to be a
850 // problem we'll make these lazily later.
851 (void) make_adapters(h_method, CHECK);
852
853 // ONLY USE the h_method now as make_adapter may have blocked
854
855 }
856
857 address Method::make_adapters(methodHandle mh, TRAPS) {
858 // Adapters for compiled code are made eagerly here. They are fairly
859 // small (generally < 100 bytes) and quick to make (and cached and shared)
860 // so making them eagerly shouldn't be too expensive.
861 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
862 if (adapter == NULL ) {
863 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
864 }
865
866 mh->set_adapter_entry(adapter);
867 mh->_from_compiled_entry = adapter->get_c2i_entry();
868 return adapter->get_c2i_entry();
869 }
870
871 // The verified_code_entry() must be called when a invoke is resolved
872 // on this method.
873
874 // It returns the compiled code entry point, after asserting not null.
875 // This function is called after potential safepoints so that nmethod
876 // or adapter that it points to is still live and valid.
877 // This function must not hit a safepoint!
878 address Method::verified_code_entry() {
879 debug_only(No_Safepoint_Verifier nsv;)
880 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
881 if (code == NULL && UseCodeCacheFlushing) {
882 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this);
883 if (saved_code != NULL) {
884 methodHandle method(this);
885 assert( ! saved_code->is_osr_method(), "should not get here for osr" );
886 set_code( method, saved_code );
887 }
888 }
889
890 assert(_from_compiled_entry != NULL, "must be set");
891 return _from_compiled_entry;
892 }
893
894 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
895 // (could be racing a deopt).
896 // Not inline to avoid circular ref.
897 bool Method::check_code() const {
898 // cached in a register or local. There's a race on the value of the field.
899 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
900 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
901 }
902
903 // Install compiled code. Instantly it can execute.
904 void Method::set_code(methodHandle mh, nmethod *code) {
905 assert( code, "use clear_code to remove code" );
906 assert( mh->check_code(), "" );
907
908 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
909
910 // These writes must happen in this order, because the interpreter will
911 // directly jump to from_interpreted_entry which jumps to an i2c adapter
912 // which jumps to _from_compiled_entry.
913 mh->_code = code; // Assign before allowing compiled code to exec
914
915 int comp_level = code->comp_level();
916 // In theory there could be a race here. In practice it is unlikely
917 // and not worth worrying about.
918 if (comp_level > mh->highest_comp_level()) {
919 mh->set_highest_comp_level(comp_level);
920 }
921
922 OrderAccess::storestore();
923 #ifdef SHARK
924 mh->_from_interpreted_entry = code->insts_begin();
925 #else //!SHARK
926 mh->_from_compiled_entry = code->verified_entry_point();
927 OrderAccess::storestore();
928 // Instantly compiled code can execute.
929 if (!mh->is_method_handle_intrinsic())
930 mh->_from_interpreted_entry = mh->get_i2c_entry();
931 #endif //!SHARK
932 }
933
934
935 bool Method::is_overridden_in(Klass* k) const {
936 InstanceKlass* ik = InstanceKlass::cast(k);
937
938 if (ik->is_interface()) return false;
939
940 // If method is an interface, we skip it - except if it
941 // is a miranda method
942 if (method_holder()->is_interface()) {
943 // Check that method is not a miranda method
944 if (ik->lookup_method(name(), signature()) == NULL) {
945 // No implementation exist - so miranda method
946 return false;
947 }
948 return true;
949 }
950
951 assert(ik->is_subclass_of(method_holder()), "should be subklass");
952 assert(ik->vtable() != NULL, "vtable should exist");
953 if (vtable_index() == nonvirtual_vtable_index) {
954 return false;
955 } else {
956 Method* vt_m = ik->method_at_vtable(vtable_index());
957 return vt_m != this;
958 }
959 }
960
961
962 // give advice about whether this Method* should be cached or not
963 bool Method::should_not_be_cached() const {
964 if (is_old()) {
965 // This method has been redefined. It is either EMCP or obsolete
966 // and we don't want to cache it because that would pin the method
967 // down and prevent it from being collectible if and when it
968 // finishes executing.
969 return true;
970 }
971
972 // caching this method should be just fine
973 return false;
974 }
975
976 // Constant pool structure for invoke methods:
977 enum {
978 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
979 _imcp_invoke_signature, // utf8: (variable Symbol*)
980 _imcp_limit
981 };
982
983 // Test if this method is an MH adapter frame generated by Java code.
984 // Cf. java/lang/invoke/InvokerBytecodeGenerator
985 bool Method::is_compiled_lambda_form() const {
986 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
987 }
988
989 // Test if this method is an internal MH primitive method.
990 bool Method::is_method_handle_intrinsic() const {
991 vmIntrinsics::ID iid = intrinsic_id();
992 return (MethodHandles::is_signature_polymorphic(iid) &&
993 MethodHandles::is_signature_polymorphic_intrinsic(iid));
994 }
995
996 bool Method::has_member_arg() const {
997 vmIntrinsics::ID iid = intrinsic_id();
998 return (MethodHandles::is_signature_polymorphic(iid) &&
999 MethodHandles::has_member_arg(iid));
1000 }
1001
1002 // Make an instance of a signature-polymorphic internal MH primitive.
1003 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1004 Symbol* signature,
1005 TRAPS) {
1006 ResourceMark rm;
1007 methodHandle empty;
1008
1009 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1010 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1011 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1012 if (TraceMethodHandles) {
1013 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1014 }
1015
1016 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1017 name->increment_refcount();
1018 signature->increment_refcount();
1019
1020 int cp_length = _imcp_limit;
1021 ClassLoaderData* loader_data = holder->class_loader_data();
1022 constantPoolHandle cp;
1023 {
1024 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1025 cp = constantPoolHandle(THREAD, cp_oop);
1026 }
1027 cp->set_pool_holder(InstanceKlass::cast(holder()));
1028 cp->symbol_at_put(_imcp_invoke_name, name);
1029 cp->symbol_at_put(_imcp_invoke_signature, signature);
1030 cp->set_preresolution();
1031
1032 // decide on access bits: public or not?
1033 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1034 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1035 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1036 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1037
1038 methodHandle m;
1039 {
1040 Method* m_oop = Method::allocate(loader_data, 0,
1041 accessFlags_from(flags_bits),
1042 0, 0, 0, 0, 0, 0,
1043 ConstMethod::NORMAL, CHECK_(empty));
1044 m = methodHandle(THREAD, m_oop);
1045 }
1046 m->set_constants(cp());
1047 m->set_name_index(_imcp_invoke_name);
1048 m->set_signature_index(_imcp_invoke_signature);
1049 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1050 assert(m->signature() == signature, "");
1051 #ifdef CC_INTERP
1052 ResultTypeFinder rtf(signature);
1053 m->set_result_index(rtf.type());
1054 #endif
1055 m->compute_size_of_parameters(THREAD);
1056 m->init_intrinsic_id();
1057 assert(m->is_method_handle_intrinsic(), "");
1058 #ifdef ASSERT
1059 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1060 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1061 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1062 #endif //ASSERT
1063
1064 // Finally, set up its entry points.
1065 assert(m->can_be_statically_bound(), "");
1066 m->set_vtable_index(Method::nonvirtual_vtable_index);
1067 m->link_method(m, CHECK_(empty));
1068
1069 if (TraceMethodHandles && (Verbose || WizardMode))
1070 m->print_on(tty);
1071
1072 return m;
1073 }
1074
1075 Klass* Method::check_non_bcp_klass(Klass* klass) {
1076 if (klass != NULL && klass->class_loader() != NULL) {
1077 if (klass->oop_is_objArray())
1078 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1079 return klass;
1080 }
1081 return NULL;
1082 }
1083
1084
1085 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1086 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1087 // Code below does not work for native methods - they should never get rewritten anyway
1088 assert(!m->is_native(), "cannot rewrite native methods");
1089 // Allocate new Method*
1090 AccessFlags flags = m->access_flags();
1091 u2 generic_signature_index = m->generic_signature_index();
1092 int checked_exceptions_len = m->checked_exceptions_length();
1093 int localvariable_len = m->localvariable_table_length();
1094 int exception_table_len = m->exception_table_length();
1095 int method_parameters_len = m->method_parameters_length();
1096
1097 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1098 Method* newm_oop = Method::allocate(loader_data,
1099 new_code_length,
1100 flags,
1101 new_compressed_linenumber_size,
1102 localvariable_len,
1103 exception_table_len,
1104 checked_exceptions_len,
1105 method_parameters_len,
1106 generic_signature_index,
1107 m->method_type(),
1108 CHECK_(methodHandle()));
1109 methodHandle newm (THREAD, newm_oop);
1110 int new_method_size = newm->method_size();
1111
1112 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1113 ConstMethod* newcm = newm->constMethod();
1114 int new_const_method_size = newm->constMethod()->size();
1115
1116 memcpy(newm(), m(), sizeof(Method));
1117
1118 // Create shallow copy of ConstMethod.
1119 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1120
1121 // Reset correct method/const method, method size, and parameter info
1122 newm->set_constMethod(newcm);
1123 newm->constMethod()->set_code_size(new_code_length);
1124 newm->constMethod()->set_constMethod_size(new_const_method_size);
1125 newm->set_method_size(new_method_size);
1126 assert(newm->code_size() == new_code_length, "check");
1127 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1128 assert(newm->exception_table_length() == exception_table_len, "check");
1129 assert(newm->localvariable_table_length() == localvariable_len, "check");
1130 // Copy new byte codes
1131 memcpy(newm->code_base(), new_code, new_code_length);
1132 // Copy line number table
1133 if (new_compressed_linenumber_size > 0) {
1134 memcpy(newm->compressed_linenumber_table(),
1135 new_compressed_linenumber_table,
1136 new_compressed_linenumber_size);
1137 }
1138 // Copy checked_exceptions
1139 if (checked_exceptions_len > 0) {
1140 memcpy(newm->checked_exceptions_start(),
1141 m->checked_exceptions_start(),
1142 checked_exceptions_len * sizeof(CheckedExceptionElement));
1143 }
1144 // Copy exception table
1145 if (exception_table_len > 0) {
1146 memcpy(newm->exception_table_start(),
1147 m->exception_table_start(),
1148 exception_table_len * sizeof(ExceptionTableElement));
1149 }
1150 // Copy local variable number table
1151 if (localvariable_len > 0) {
1152 memcpy(newm->localvariable_table_start(),
1153 m->localvariable_table_start(),
1154 localvariable_len * sizeof(LocalVariableTableElement));
1155 }
1156 // Copy stackmap table
1157 if (m->has_stackmap_table()) {
1158 int code_attribute_length = m->stackmap_data()->length();
1159 Array<u1>* stackmap_data =
1160 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1161 memcpy((void*)stackmap_data->adr_at(0),
1162 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1163 newm->set_stackmap_data(stackmap_data);
1164 }
1165
1166 return newm;
1167 }
1168
1169 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1170 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1171 // because we are not loading from core libraries
1172 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1173 // which does not use the class default class loader so we check for its loader here
1174 if ((InstanceKlass::cast(holder)->class_loader() != NULL) &&
1175 InstanceKlass::cast(holder)->class_loader()->klass()->name() != vmSymbols::sun_misc_Launcher_ExtClassLoader()) {
1176 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1177 }
1178
1179 // see if the klass name is well-known:
1180 Symbol* klass_name = InstanceKlass::cast(holder)->name();
1181 return vmSymbols::find_sid(klass_name);
1182 }
1183
1184 void Method::init_intrinsic_id() {
1185 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1186 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1187 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1188 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1189
1190 // the klass name is well-known:
1191 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1192 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1193
1194 // ditto for method and signature:
1195 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1196 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1197 && name_id == vmSymbols::NO_SID)
1198 return;
1199 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1200 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1201 && sig_id == vmSymbols::NO_SID) return;
1202 jshort flags = access_flags().as_short();
1203
1204 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1205 if (id != vmIntrinsics::_none) {
1206 set_intrinsic_id(id);
1207 return;
1208 }
1209
1210 // A few slightly irregular cases:
1211 switch (klass_id) {
1212 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1213 // Second chance: check in regular Math.
1214 switch (name_id) {
1215 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1216 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1217 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1218 // pretend it is the corresponding method in the non-strict class:
1219 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1220 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1221 break;
1222 }
1223 break;
1224
1225 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1226 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1227 if (!is_native()) break;
1228 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1229 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1230 id = vmIntrinsics::_none;
1231 break;
1232 }
1233
1234 if (id != vmIntrinsics::_none) {
1235 // Set up its iid. It is an alias method.
1236 set_intrinsic_id(id);
1237 return;
1238 }
1239 }
1240
1241 // These two methods are static since a GC may move the Method
1242 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1243 if (THREAD->is_Compiler_thread()) {
1244 // There is nothing useful this routine can do from within the Compile thread.
1245 // Hopefully, the signature contains only well-known classes.
1246 // We could scan for this and return true/false, but the caller won't care.
1247 return false;
1248 }
1249 bool sig_is_loaded = true;
1250 Handle class_loader(THREAD, m->method_holder()->class_loader());
1251 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1252 ResourceMark rm(THREAD);
1253 Symbol* signature = m->signature();
1254 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1255 if (ss.is_object()) {
1256 Symbol* sym = ss.as_symbol(CHECK_(false));
1257 Symbol* name = sym;
1258 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1259 protection_domain, THREAD);
1260 // We are loading classes eagerly. If a ClassNotFoundException or
1261 // a LinkageError was generated, be sure to ignore it.
1262 if (HAS_PENDING_EXCEPTION) {
1263 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1264 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1265 CLEAR_PENDING_EXCEPTION;
1266 } else {
1267 return false;
1268 }
1269 }
1270 if( klass == NULL) { sig_is_loaded = false; }
1271 }
1272 }
1273 return sig_is_loaded;
1274 }
1275
1276 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1277 Handle class_loader(THREAD, m->method_holder()->class_loader());
1278 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1279 ResourceMark rm(THREAD);
1280 Symbol* signature = m->signature();
1281 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1282 if (ss.type() == T_OBJECT) {
1283 Symbol* name = ss.as_symbol_or_null();
1284 if (name == NULL) return true;
1285 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1286 if (klass == NULL) return true;
1287 }
1288 }
1289 return false;
1290 }
1291
1292 // Exposed so field engineers can debug VM
1293 void Method::print_short_name(outputStream* st) {
1294 ResourceMark rm;
1295 #ifdef PRODUCT
1296 st->print(" %s::", method_holder()->external_name());
1297 #else
1298 st->print(" %s::", method_holder()->internal_name());
1299 #endif
1300 name()->print_symbol_on(st);
1301 if (WizardMode) signature()->print_symbol_on(st);
1302 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1303 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1304 }
1305
1306 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1307 static void reorder_based_on_method_index(Array<Method*>* methods,
1308 Array<AnnotationArray*>* annotations,
1309 GrowableArray<AnnotationArray*>* temp_array) {
1310 if (annotations == NULL) {
1311 return;
1312 }
1313
1314 int length = methods->length();
1315 int i;
1316 // Copy to temp array
1317 temp_array->clear();
1318 for (i = 0; i < length; i++) {
1319 temp_array->append(annotations->at(i));
1320 }
1321
1322 // Copy back using old method indices
1323 for (i = 0; i < length; i++) {
1324 Method* m = methods->at(i);
1325 annotations->at_put(i, temp_array->at(m->method_idnum()));
1326 }
1327 }
1328
1329 // Comparer for sorting an object array containing
1330 // Method*s.
1331 static int method_comparator(Method* a, Method* b) {
1332 return a->name()->fast_compare(b->name());
1333 }
1334
1335 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1336 void Method::sort_methods(Array<Method*>* methods,
1337 Array<AnnotationArray*>* methods_annotations,
1338 Array<AnnotationArray*>* methods_parameter_annotations,
1339 Array<AnnotationArray*>* methods_default_annotations,
1340 Array<AnnotationArray*>* methods_type_annotations,
1341 bool idempotent) {
1342 int length = methods->length();
1343 if (length > 1) {
1344 bool do_annotations = false;
1345 if (methods_annotations != NULL ||
1346 methods_parameter_annotations != NULL ||
1347 methods_default_annotations != NULL ||
1348 methods_type_annotations != NULL) {
1349 do_annotations = true;
1350 }
1351 if (do_annotations) {
1352 // Remember current method ordering so we can reorder annotations
1353 for (int i = 0; i < length; i++) {
1354 Method* m = methods->at(i);
1355 m->set_method_idnum(i);
1356 }
1357 }
1358 {
1359 No_Safepoint_Verifier nsv;
1360 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1361 }
1362
1363 // Sort annotations if necessary
1364 assert(methods_annotations == NULL || methods_annotations->length() == methods->length(), "");
1365 assert(methods_parameter_annotations == NULL || methods_parameter_annotations->length() == methods->length(), "");
1366 assert(methods_default_annotations == NULL || methods_default_annotations->length() == methods->length(), "");
1367 assert(methods_type_annotations == NULL || methods_type_annotations->length() == methods->length(), "");
1368 if (do_annotations) {
1369 ResourceMark rm;
1370 // Allocate temporary storage
1371 GrowableArray<AnnotationArray*>* temp_array = new GrowableArray<AnnotationArray*>(length);
1372 reorder_based_on_method_index(methods, methods_annotations, temp_array);
1373 reorder_based_on_method_index(methods, methods_parameter_annotations, temp_array);
1374 reorder_based_on_method_index(methods, methods_default_annotations, temp_array);
1375 reorder_based_on_method_index(methods, methods_type_annotations, temp_array);
1376 }
1377
1378 // Reset method ordering
1379 for (int i = 0; i < length; i++) {
1380 Method* m = methods->at(i);
1381 m->set_method_idnum(i);
1382 }
1383 }
1384 }
1385
1386
1387 //-----------------------------------------------------------------------------------
1388 // Non-product code
1389
1390 #ifndef PRODUCT
1391 class SignatureTypePrinter : public SignatureTypeNames {
1392 private:
1393 outputStream* _st;
1394 bool _use_separator;
1395
1396 void type_name(const char* name) {
1397 if (_use_separator) _st->print(", ");
1398 _st->print(name);
1399 _use_separator = true;
1400 }
1401
1402 public:
1403 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1404 _st = st;
1405 _use_separator = false;
1406 }
1407
1408 void print_parameters() { _use_separator = false; iterate_parameters(); }
1409 void print_returntype() { _use_separator = false; iterate_returntype(); }
1410 };
1411
1412
1413 void Method::print_name(outputStream* st) {
1414 Thread *thread = Thread::current();
1415 ResourceMark rm(thread);
1416 SignatureTypePrinter sig(signature(), st);
1417 st->print("%s ", is_static() ? "static" : "virtual");
1418 sig.print_returntype();
1419 st->print(" %s.", method_holder()->internal_name());
1420 name()->print_symbol_on(st);
1421 st->print("(");
1422 sig.print_parameters();
1423 st->print(")");
1424 }
1425
1426
1427 void Method::print_codes_on(outputStream* st) const {
1428 print_codes_on(0, code_size(), st);
1429 }
1430
1431 void Method::print_codes_on(int from, int to, outputStream* st) const {
1432 Thread *thread = Thread::current();
1433 ResourceMark rm(thread);
1434 methodHandle mh (thread, (Method*)this);
1435 BytecodeStream s(mh);
1436 s.set_interval(from, to);
1437 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1438 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1439 }
1440 #endif // not PRODUCT
1441
1442
1443 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1444 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1445 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1446 // as end-of-stream terminator.
1447
1448 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1449 // bci and line number does not compress into single byte.
1450 // Write out escape character and use regular compression for bci and line number.
1451 write_byte((jubyte)0xFF);
1452 write_signed_int(bci_delta);
1453 write_signed_int(line_delta);
1454 }
1455
1456 // See comment in method.hpp which explains why this exists.
1457 #if defined(_M_AMD64) && _MSC_VER >= 1400
1458 #pragma optimize("", off)
1459 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1460 write_pair_inline(bci, line);
1461 }
1462 #pragma optimize("", on)
1463 #endif
1464
1465 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1466 _bci = 0;
1467 _line = 0;
1468 };
1469
1470
1471 bool CompressedLineNumberReadStream::read_pair() {
1472 jubyte next = read_byte();
1473 // Check for terminator
1474 if (next == 0) return false;
1475 if (next == 0xFF) {
1476 // Escape character, regular compression used
1477 _bci += read_signed_int();
1478 _line += read_signed_int();
1479 } else {
1480 // Single byte compression used
1481 _bci += next >> 3;
1482 _line += next & 0x7;
1483 }
1484 return true;
1485 }
1486
1487
1488 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1489 BreakpointInfo* bp = method_holder()->breakpoints();
1490 for (; bp != NULL; bp = bp->next()) {
1491 if (bp->match(this, bci)) {
1492 return bp->orig_bytecode();
1493 }
1494 }
1495 ShouldNotReachHere();
1496 return Bytecodes::_shouldnotreachhere;
1497 }
1498
1499 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1500 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1501 BreakpointInfo* bp = method_holder()->breakpoints();
1502 for (; bp != NULL; bp = bp->next()) {
1503 if (bp->match(this, bci)) {
1504 bp->set_orig_bytecode(code);
1505 // and continue, in case there is more than one
1506 }
1507 }
1508 }
1509
1510 void Method::set_breakpoint(int bci) {
1511 InstanceKlass* ik = method_holder();
1512 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1513 bp->set_next(ik->breakpoints());
1514 ik->set_breakpoints(bp);
1515 // do this last:
1516 bp->set(this);
1517 }
1518
1519 static void clear_matches(Method* m, int bci) {
1520 InstanceKlass* ik = m->method_holder();
1521 BreakpointInfo* prev_bp = NULL;
1522 BreakpointInfo* next_bp;
1523 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1524 next_bp = bp->next();
1525 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1526 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1527 // do this first:
1528 bp->clear(m);
1529 // unhook it
1530 if (prev_bp != NULL)
1531 prev_bp->set_next(next_bp);
1532 else
1533 ik->set_breakpoints(next_bp);
1534 delete bp;
1535 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1536 // at same location. So we have multiple matching (method_index and bci)
1537 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1538 // breakpoint for clear_breakpoint request and keep all other method versions
1539 // BreakpointInfo for future clear_breakpoint request.
1540 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1541 // which is being called when class is unloaded. We delete all the Breakpoint
1542 // information for all versions of method. We may not correctly restore the original
1543 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1544 // so these methods won't be used anymore.
1545 if (bci >= 0) {
1546 break;
1547 }
1548 } else {
1549 // This one is a keeper.
1550 prev_bp = bp;
1551 }
1552 }
1553 }
1554
1555 void Method::clear_breakpoint(int bci) {
1556 assert(bci >= 0, "");
1557 clear_matches(this, bci);
1558 }
1559
1560 void Method::clear_all_breakpoints() {
1561 clear_matches(this, -1);
1562 }
1563
1564
1565 int Method::invocation_count() {
1566 if (TieredCompilation) {
1567 MethodData* const mdo = method_data();
1568 if (invocation_counter()->carry() || ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1569 return InvocationCounter::count_limit;
1570 } else {
1571 return invocation_counter()->count() + ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1572 }
1573 } else {
1574 return invocation_counter()->count();
1575 }
1576 }
1577
1578 int Method::backedge_count() {
1579 if (TieredCompilation) {
1580 MethodData* const mdo = method_data();
1581 if (backedge_counter()->carry() || ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1582 return InvocationCounter::count_limit;
1583 } else {
1584 return backedge_counter()->count() + ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1585 }
1586 } else {
1587 return backedge_counter()->count();
1588 }
1589 }
1590
1591 int Method::highest_comp_level() const {
1592 MethodData* mdo = method_data();
1593 if (mdo != NULL) {
1594 return mdo->highest_comp_level();
1595 } else {
1596 return CompLevel_none;
1597 }
1598 }
1599
1600 int Method::highest_osr_comp_level() const {
1601 MethodData* mdo = method_data();
1602 if (mdo != NULL) {
1603 return mdo->highest_osr_comp_level();
1604 } else {
1605 return CompLevel_none;
1606 }
1607 }
1608
1609 void Method::set_highest_comp_level(int level) {
1610 MethodData* mdo = method_data();
1611 if (mdo != NULL) {
1612 mdo->set_highest_comp_level(level);
1613 }
1614 }
1615
1616 void Method::set_highest_osr_comp_level(int level) {
1617 MethodData* mdo = method_data();
1618 if (mdo != NULL) {
1619 mdo->set_highest_osr_comp_level(level);
1620 }
1621 }
1622
1623 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1624 _bci = bci;
1625 _name_index = m->name_index();
1626 _signature_index = m->signature_index();
1627 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1628 if (_orig_bytecode == Bytecodes::_breakpoint)
1629 _orig_bytecode = m->orig_bytecode_at(_bci);
1630 _next = NULL;
1631 }
1632
1633 void BreakpointInfo::set(Method* method) {
1634 #ifdef ASSERT
1635 {
1636 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1637 if (code == Bytecodes::_breakpoint)
1638 code = method->orig_bytecode_at(_bci);
1639 assert(orig_bytecode() == code, "original bytecode must be the same");
1640 }
1641 #endif
1642 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1643 method->incr_number_of_breakpoints();
1644 SystemDictionary::notice_modification();
1645 {
1646 // Deoptimize all dependents on this method
1647 Thread *thread = Thread::current();
1648 HandleMark hm(thread);
1649 methodHandle mh(thread, method);
1650 Universe::flush_dependents_on_method(mh);
1651 }
1652 }
1653
1654 void BreakpointInfo::clear(Method* method) {
1655 *method->bcp_from(_bci) = orig_bytecode();
1656 assert(method->number_of_breakpoints() > 0, "must not go negative");
1657 method->decr_number_of_breakpoints();
1658 }
1659
1660 // jmethodID handling
1661
1662 // This is a block allocating object, sort of like JNIHandleBlock, only a
1663 // lot simpler. There aren't many of these, they aren't long, they are rarely
1664 // deleted and so we can do some suboptimal things.
1665 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1666 // never get rid of it.
1667 // It would be nice to be able to parameterize the number of methods for
1668 // the null_class_loader but then we'd have to turn this and ClassLoaderData
1669 // into templates.
1670
1671 // I feel like this brain dead class should exist somewhere in the STL
1672
1673 class JNIMethodBlock : public CHeapObj<mtClass> {
1674 enum { number_of_methods = 8 };
1675
1676 Method* _methods[number_of_methods];
1677 int _top;
1678 JNIMethodBlock* _next;
1679 public:
1680 static Method* const _free_method;
1681
1682 JNIMethodBlock() : _next(NULL), _top(0) {
1683 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method;
1684 }
1685
1686 Method** add_method(Method* m) {
1687 if (_top < number_of_methods) {
1688 // top points to the next free entry.
1689 int i = _top;
1690 _methods[i] = m;
1691 _top++;
1692 return &_methods[i];
1693 } else if (_top == number_of_methods) {
1694 // if the next free entry ran off the block see if there's a free entry
1695 for (int i = 0; i< number_of_methods; i++) {
1696 if (_methods[i] == _free_method) {
1697 _methods[i] = m;
1698 return &_methods[i];
1699 }
1700 }
1701 // Only check each block once for frees. They're very unlikely.
1702 // Increment top past the end of the block.
1703 _top++;
1704 }
1705 // need to allocate a next block.
1706 if (_next == NULL) {
1707 _next = new JNIMethodBlock();
1708 }
1709 return _next->add_method(m);
1710 }
1711
1712 bool contains(Method** m) {
1713 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1714 for (int i = 0; i< number_of_methods; i++) {
1715 if (&(b->_methods[i]) == m) {
1716 return true;
1717 }
1718 }
1719 }
1720 return false; // not found
1721 }
1722
1723 // Doesn't really destroy it, just marks it as free so it can be reused.
1724 void destroy_method(Method** m) {
1725 #ifdef ASSERT
1726 assert(contains(m), "should be a methodID");
1727 #endif // ASSERT
1728 *m = _free_method;
1729 }
1730
1731 // During class unloading the methods are cleared, which is different
1732 // than freed.
1733 void clear_all_methods() {
1734 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1735 for (int i = 0; i< number_of_methods; i++) {
1736 _methods[i] = NULL;
1737 }
1738 }
1739 }
1740 #ifndef PRODUCT
1741 int count_methods() {
1742 // count all allocated methods
1743 int count = 0;
1744 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1745 for (int i = 0; i< number_of_methods; i++) {
1746 if (_methods[i] != _free_method) count++;
1747 }
1748 }
1749 return count;
1750 }
1751 #endif // PRODUCT
1752 };
1753
1754 // Something that can't be mistaken for an address or a markOop
1755 Method* const JNIMethodBlock::_free_method = (Method*)55;
1756
1757 // Add a method id to the jmethod_ids
1758 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
1759 ClassLoaderData* cld = loader_data;
1760
1761 if (!SafepointSynchronize::is_at_safepoint()) {
1762 // Have to add jmethod_ids() to class loader data thread-safely.
1763 // Also have to add the method to the list safely, which the cld lock
1764 // protects as well.
1765 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1766 if (cld->jmethod_ids() == NULL) {
1767 cld->set_jmethod_ids(new JNIMethodBlock());
1768 }
1769 // jmethodID is a pointer to Method*
1770 return (jmethodID)cld->jmethod_ids()->add_method(m);
1771 } else {
1772 // At safepoint, we are single threaded and can set this.
1773 if (cld->jmethod_ids() == NULL) {
1774 cld->set_jmethod_ids(new JNIMethodBlock());
1775 }
1776 // jmethodID is a pointer to Method*
1777 return (jmethodID)cld->jmethod_ids()->add_method(m);
1778 }
1779 }
1780
1781 // Mark a jmethodID as free. This is called when there is a data race in
1782 // InstanceKlass while creating the jmethodID cache.
1783 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
1784 ClassLoaderData* cld = loader_data;
1785 Method** ptr = (Method**)m;
1786 assert(cld->jmethod_ids() != NULL, "should have method handles");
1787 cld->jmethod_ids()->destroy_method(ptr);
1788 }
1789
1790 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
1791 // Can't assert the method_holder is the same because the new method has the
1792 // scratch method holder.
1793 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
1794 == new_method->method_holder()->class_loader(),
1795 "changing to a different class loader");
1796 // Just change the method in place, jmethodID pointer doesn't change.
1797 *((Method**)jmid) = new_method;
1798 }
1799
1800 bool Method::is_method_id(jmethodID mid) {
1801 Method* m = resolve_jmethod_id(mid);
1802 assert(m != NULL, "should be called with non-null method");
1803 InstanceKlass* ik = m->method_holder();
1804 ClassLoaderData* cld = ik->class_loader_data();
1805 if (cld->jmethod_ids() == NULL) return false;
1806 return (cld->jmethod_ids()->contains((Method**)mid));
1807 }
1808
1809 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
1810 if (mid == NULL) return NULL;
1811 Method* o = resolve_jmethod_id(mid);
1812 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
1813 return NULL;
1814 }
1815 return o;
1816 };
1817
1818 void Method::set_on_stack(const bool value) {
1819 // Set both the method itself and its constant pool. The constant pool
1820 // on stack means some method referring to it is also on the stack.
1821 _access_flags.set_on_stack(value);
1822 constants()->set_on_stack(value);
1823 if (value) MetadataOnStackMark::record(this);
1824 }
1825
1826 // Called when the class loader is unloaded to make all methods weak.
1827 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1828 loader_data->jmethod_ids()->clear_all_methods();
1829 }
1830
1831
1832 // Check that this pointer is valid by checking that the vtbl pointer matches
1833 bool Method::is_valid_method() const {
1834 if (this == NULL) {
1835 return false;
1836 } else if (!is_metaspace_object()) {
1837 return false;
1838 } else {
1839 Method m;
1840 // This assumes that the vtbl pointer is the first word of a C++ object.
1841 // This assumption is also in universe.cpp patch_klass_vtble
1842 void* vtbl2 = dereference_vptr((void*)&m);
1843 void* this_vtbl = dereference_vptr((void*)this);
1844 return vtbl2 == this_vtbl;
1845 }
1846 }
1847
1848 #ifndef PRODUCT
1849 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1850 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1851 }
1852 #endif // PRODUCT
1853
1854
1855 // Printing
1856
1857 #ifndef PRODUCT
1858
1859 void Method::print_on(outputStream* st) const {
1860 ResourceMark rm;
1861 assert(is_method(), "must be method");
1862 st->print_cr(internal_name());
1863 // get the effect of PrintOopAddress, always, for methods:
1864 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this);
1865 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
1866 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants());
1867 constants()->print_value_on(st); st->cr();
1868 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
1869 st->print (" - name: "); name()->print_value_on(st); st->cr();
1870 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
1871 st->print_cr(" - max stack: %d", max_stack());
1872 st->print_cr(" - max locals: %d", max_locals());
1873 st->print_cr(" - size of params: %d", size_of_parameters());
1874 st->print_cr(" - method size: %d", method_size());
1875 if (intrinsic_id() != vmIntrinsics::_none)
1876 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
1877 if (highest_comp_level() != CompLevel_none)
1878 st->print_cr(" - highest level: %d", highest_comp_level());
1879 st->print_cr(" - vtable index: %d", _vtable_index);
1880 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
1881 st->print( " - adapters: ");
1882 AdapterHandlerEntry* a = ((Method*)this)->adapter();
1883 if (a == NULL)
1884 st->print_cr(INTPTR_FORMAT, a);
1885 else
1886 a->print_adapter_on(st);
1887 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
1888 st->print_cr(" - code size: %d", code_size());
1889 if (code_size() != 0) {
1890 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
1891 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
1892 }
1893 if (method_data() != NULL) {
1894 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
1895 }
1896 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
1897 if (checked_exceptions_length() > 0) {
1898 CheckedExceptionElement* table = checked_exceptions_start();
1899 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
1900 if (Verbose) {
1901 for (int i = 0; i < checked_exceptions_length(); i++) {
1902 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
1903 }
1904 }
1905 }
1906 if (has_linenumber_table()) {
1907 u_char* table = compressed_linenumber_table();
1908 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
1909 if (Verbose) {
1910 CompressedLineNumberReadStream stream(table);
1911 while (stream.read_pair()) {
1912 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
1913 }
1914 }
1915 }
1916 st->print_cr(" - localvar length: %d", localvariable_table_length());
1917 if (localvariable_table_length() > 0) {
1918 LocalVariableTableElement* table = localvariable_table_start();
1919 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
1920 if (Verbose) {
1921 for (int i = 0; i < localvariable_table_length(); i++) {
1922 int bci = table[i].start_bci;
1923 int len = table[i].length;
1924 const char* name = constants()->printable_name_at(table[i].name_cp_index);
1925 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
1926 int slot = table[i].slot;
1927 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
1928 }
1929 }
1930 }
1931 if (code() != NULL) {
1932 st->print (" - compiled code: ");
1933 code()->print_value_on(st);
1934 }
1935 if (is_native()) {
1936 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
1937 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
1938 }
1939 }
1940
1941 #endif //PRODUCT
1942
1943 void Method::print_value_on(outputStream* st) const {
1944 assert(is_method(), "must be method");
1945 st->print_cr(internal_name());
1946 print_address_on(st);
1947 st->print(" ");
1948 name()->print_value_on(st);
1949 st->print(" ");
1950 signature()->print_value_on(st);
1951 st->print(" in ");
1952 method_holder()->print_value_on(st);
1953 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
1954 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
1955 }
1956
1957
1958 // Verification
1959
1960 void Method::verify_on(outputStream* st) {
1961 guarantee(is_method(), "object must be method");
1962 guarantee(is_metadata(), "should be metadata");
1963 guarantee(constants()->is_constantPool(), "should be constant pool");
1964 guarantee(constants()->is_metadata(), "should be metadata");
1965 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
1966 guarantee(constMethod()->is_metadata(), "should be metadata");
1967 MethodData* md = method_data();
1968 guarantee(md == NULL ||
1969 md->is_metadata(), "should be metadata");
1970 guarantee(md == NULL ||
1971 md->is_methodData(), "should be method data");
1972 }