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