1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/metadataOnStackMark.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "code/debugInfoRec.hpp"
29 #include "gc_interface/collectedHeap.inline.hpp"
30 #include "interpreter/bytecodeStream.hpp"
31 #include "interpreter/bytecodeTracer.hpp"
32 #include "interpreter/bytecodes.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "interpreter/oopMapCache.hpp"
35 #include "memory/gcLocker.hpp"
36 #include "memory/generation.hpp"
37 #include "memory/heapInspection.hpp"
38 #include "memory/metadataFactory.hpp"
39 #include "memory/oopFactory.hpp"
40 #include "oops/constMethod.hpp"
41 #include "oops/methodData.hpp"
42 #include "oops/method.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "oops/symbol.hpp"
45 #include "prims/jvmtiExport.hpp"
46 #include "prims/methodHandles.hpp"
47 #include "prims/nativeLookup.hpp"
48 #include "runtime/arguments.hpp"
49 #include "runtime/compilationPolicy.hpp"
50 #include "runtime/frame.inline.hpp"
51 #include "runtime/handles.inline.hpp"
52 #include "runtime/relocator.hpp"
53 #include "runtime/sharedRuntime.hpp"
54 #include "runtime/signature.hpp"
55 #include "utilities/quickSort.hpp"
56 #include "utilities/xmlstream.hpp"
57
58
59 // Implementation of Method
60
61 Method* Method::allocate(ClassLoaderData* loader_data,
62 int byte_code_size,
63 AccessFlags access_flags,
64 InlineTableSizes* sizes,
65 ConstMethod::MethodType method_type,
66 TRAPS) {
67 assert(!access_flags.is_native() || byte_code_size == 0,
68 "native methods should not contain byte codes");
69 ConstMethod* cm = ConstMethod::allocate(loader_data,
70 byte_code_size,
71 sizes,
72 method_type,
73 CHECK_NULL);
74
75 int size = Method::size(access_flags.is_native());
76
77 return new (loader_data, size, false, THREAD) Method(cm, access_flags, size);
78 }
79
80 Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) {
81 No_Safepoint_Verifier no_safepoint;
82 set_constMethod(xconst);
83 set_access_flags(access_flags);
84 set_method_size(size);
85 #ifdef CC_INTERP
86 set_result_index(T_VOID);
87 #endif
88 set_intrinsic_id(vmIntrinsics::_none);
89 set_jfr_towrite(false);
90 set_force_inline(false);
91 set_hidden(false);
92 set_dont_inline(false);
93 set_method_data(NULL);
94 set_interpreter_throwout_count(0);
95 set_vtable_index(Method::garbage_vtable_index);
96
97 // Fix and bury in Method*
98 set_interpreter_entry(NULL); // sets i2i entry and from_int
99 set_adapter_entry(NULL);
100 clear_code(); // from_c/from_i get set to c2i/i2i
101
102 if (access_flags.is_native()) {
103 clear_native_function();
104 set_signature_handler(NULL);
105 }
106
107 NOT_PRODUCT(set_compiled_invocation_count(0);)
108 set_interpreter_invocation_count(0);
109 invocation_counter()->init();
110 backedge_counter()->init();
111 clear_number_of_breakpoints();
112
113 #ifdef TIERED
114 set_rate(0);
115 set_prev_event_count(0);
116 set_prev_time(0);
117 #endif
118 }
119
120 // Release Method*. The nmethod will be gone when we get here because
121 // we've walked the code cache.
122 void Method::deallocate_contents(ClassLoaderData* loader_data) {
123 MetadataFactory::free_metadata(loader_data, constMethod());
124 set_constMethod(NULL);
125 MetadataFactory::free_metadata(loader_data, method_data());
126 set_method_data(NULL);
127 // The nmethod will be gone when we get here.
128 if (code() != NULL) _code = NULL;
129 }
130
131 address Method::get_i2c_entry() {
132 assert(_adapter != NULL, "must have");
133 return _adapter->get_i2c_entry();
134 }
135
136 address Method::get_c2i_entry() {
137 assert(_adapter != NULL, "must have");
138 return _adapter->get_c2i_entry();
139 }
140
141 address Method::get_c2i_unverified_entry() {
142 assert(_adapter != NULL, "must have");
143 return _adapter->get_c2i_unverified_entry();
144 }
145
146 char* Method::name_and_sig_as_C_string() const {
147 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
148 }
149
150 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
151 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
152 }
153
154 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
155 const char* klass_name = klass->external_name();
156 int klass_name_len = (int)strlen(klass_name);
157 int method_name_len = method_name->utf8_length();
158 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
159 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
160 strcpy(dest, klass_name);
161 dest[klass_name_len] = '.';
162 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
163 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
164 dest[len] = 0;
165 return dest;
166 }
167
168 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
169 Symbol* klass_name = klass->name();
170 klass_name->as_klass_external_name(buf, size);
171 int len = (int)strlen(buf);
172
173 if (len < size - 1) {
174 buf[len++] = '.';
175
176 method_name->as_C_string(&(buf[len]), size - len);
177 len = (int)strlen(buf);
178
179 signature->as_C_string(&(buf[len]), size - len);
180 }
181
182 return buf;
183 }
184
185 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) {
186 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
187 // access exception table
188 ExceptionTable table(mh());
189 int length = table.length();
190 // iterate through all entries sequentially
191 constantPoolHandle pool(THREAD, mh->constants());
192 for (int i = 0; i < length; i ++) {
193 //reacquire the table in case a GC happened
194 ExceptionTable table(mh());
195 int beg_bci = table.start_pc(i);
196 int end_bci = table.end_pc(i);
197 assert(beg_bci <= end_bci, "inconsistent exception table");
198 if (beg_bci <= throw_bci && throw_bci < end_bci) {
199 // exception handler bci range covers throw_bci => investigate further
200 int handler_bci = table.handler_pc(i);
201 int klass_index = table.catch_type_index(i);
202 if (klass_index == 0) {
203 return handler_bci;
204 } else if (ex_klass.is_null()) {
205 return handler_bci;
206 } else {
207 // we know the exception class => get the constraint class
208 // this may require loading of the constraint class; if verification
209 // fails or some other exception occurs, return handler_bci
210 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
211 KlassHandle klass = KlassHandle(THREAD, k);
212 assert(klass.not_null(), "klass not loaded");
213 if (ex_klass->is_subtype_of(klass())) {
214 return handler_bci;
215 }
216 }
217 }
218 }
219
220 return -1;
221 }
222
223 void Method::mask_for(int bci, InterpreterOopMap* mask) {
224
225 Thread* myThread = Thread::current();
226 methodHandle h_this(myThread, this);
227 #ifdef ASSERT
228 bool has_capability = myThread->is_VM_thread() ||
229 myThread->is_ConcurrentGC_thread() ||
230 myThread->is_GC_task_thread();
231
232 if (!has_capability) {
233 if (!VerifyStack && !VerifyLastFrame) {
234 // verify stack calls this outside VM thread
235 warning("oopmap should only be accessed by the "
236 "VM, GC task or CMS threads (or during debugging)");
237 InterpreterOopMap local_mask;
238 method_holder()->mask_for(h_this, bci, &local_mask);
239 local_mask.print();
240 }
241 }
242 #endif
243 method_holder()->mask_for(h_this, bci, mask);
244 return;
245 }
246
247
248 int Method::bci_from(address bcp) const {
249 #ifdef ASSERT
250 { ResourceMark rm;
251 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
252 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string()));
253 }
254 #endif
255 return bcp - code_base();
256 }
257
258
259 // Return (int)bcx if it appears to be a valid BCI.
260 // Return bci_from((address)bcx) if it appears to be a valid BCP.
261 // Return -1 otherwise.
262 // Used by profiling code, when invalid data is a possibility.
263 // The caller is responsible for validating the Method* itself.
264 int Method::validate_bci_from_bcx(intptr_t bcx) const {
265 // keep bci as -1 if not a valid bci
266 int bci = -1;
267 if (bcx == 0 || (address)bcx == code_base()) {
268 // code_size() may return 0 and we allow 0 here
269 // the method may be native
270 bci = 0;
271 } else if (frame::is_bci(bcx)) {
272 if (bcx < code_size()) {
273 bci = (int)bcx;
274 }
275 } else if (contains((address)bcx)) {
276 bci = (address)bcx - code_base();
277 }
278 // Assert that if we have dodged any asserts, bci is negative.
279 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
280 return bci;
281 }
282
283 address Method::bcp_from(int bci) const {
284 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci");
285 address bcp = code_base() + bci;
286 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
287 return bcp;
288 }
289
290
291 int Method::size(bool is_native) {
292 // If native, then include pointers for native_function and signature_handler
293 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
294 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
295 return align_object_size(header_size() + extra_words);
296 }
297
298
299 Symbol* Method::klass_name() const {
300 Klass* k = method_holder();
301 assert(k->is_klass(), "must be klass");
302 InstanceKlass* ik = (InstanceKlass*) k;
303 return ik->name();
304 }
305
306
307 // Attempt to return method oop to original state. Clear any pointers
308 // (to objects outside the shared spaces). We won't be able to predict
309 // where they should point in a new JVM. Further initialize some
310 // entries now in order allow them to be write protected later.
311
312 void Method::remove_unshareable_info() {
313 unlink_method();
314 }
315
316
317 bool Method::was_executed_more_than(int n) {
318 // Invocation counter is reset when the Method* is compiled.
319 // If the method has compiled code we therefore assume it has
320 // be excuted more than n times.
321 if (is_accessor() || is_empty_method() || (code() != NULL)) {
322 // interpreter doesn't bump invocation counter of trivial methods
323 // compiler does not bump invocation counter of compiled methods
324 return true;
325 }
326 else if (_invocation_counter.carry() || (method_data() != NULL && method_data()->invocation_counter()->carry())) {
327 // The carry bit is set when the counter overflows and causes
328 // a compilation to occur. We don't know how many times
329 // the counter has been reset, so we simply assume it has
330 // been executed more than n times.
331 return true;
332 } else {
333 return invocation_count() > n;
334 }
335 }
336
337 #ifndef PRODUCT
338 void Method::print_invocation_count() {
339 if (is_static()) tty->print("static ");
340 if (is_final()) tty->print("final ");
341 if (is_synchronized()) tty->print("synchronized ");
342 if (is_native()) tty->print("native ");
343 method_holder()->name()->print_symbol_on(tty);
344 tty->print(".");
345 name()->print_symbol_on(tty);
346 signature()->print_symbol_on(tty);
347
348 if (WizardMode) {
349 // dump the size of the byte codes
350 tty->print(" {%d}", code_size());
351 }
352 tty->cr();
353
354 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
355 tty->print_cr (" invocation_counter: %8d ", invocation_count());
356 tty->print_cr (" backedge_counter: %8d ", backedge_count());
357 if (CountCompiledCalls) {
358 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
359 }
360
361 }
362 #endif
363
364 // Build a MethodData* object to hold information about this method
365 // collected in the interpreter.
366 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
367 // Do not profile method if current thread holds the pending list lock,
368 // which avoids deadlock for acquiring the MethodData_lock.
369 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
370 return;
371 }
372
373 // Grab a lock here to prevent multiple
374 // MethodData*s from being created.
375 MutexLocker ml(MethodData_lock, THREAD);
376 if (method->method_data() == NULL) {
377 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
378 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);
379 method->set_method_data(method_data);
380 if (PrintMethodData && (Verbose || WizardMode)) {
381 ResourceMark rm(THREAD);
382 tty->print("build_interpreter_method_data for ");
383 method->print_name(tty);
384 tty->cr();
385 // At the end of the run, the MDO, full of data, will be dumped.
386 }
387 }
388 }
389
390 void Method::cleanup_inline_caches() {
391 // The current system doesn't use inline caches in the interpreter
392 // => nothing to do (keep this method around for future use)
393 }
394
395
396 int Method::extra_stack_words() {
397 // not an inline function, to avoid a header dependency on Interpreter
398 return extra_stack_entries() * Interpreter::stackElementSize;
399 }
400
401
402 void Method::compute_size_of_parameters(Thread *thread) {
403 ArgumentSizeComputer asc(signature());
404 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
405 }
406
407 #ifdef CC_INTERP
408 void Method::set_result_index(BasicType type) {
409 _result_index = Interpreter::BasicType_as_index(type);
410 }
411 #endif
412
413 BasicType Method::result_type() const {
414 ResultTypeFinder rtf(signature());
415 return rtf.type();
416 }
417
418
419 bool Method::is_empty_method() const {
420 return code_size() == 1
421 && *code_base() == Bytecodes::_return;
422 }
423
424
425 bool Method::is_vanilla_constructor() const {
426 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
427 // which only calls the superclass vanilla constructor and possibly does stores of
428 // zero constants to local fields:
429 //
430 // aload_0
431 // invokespecial
432 // indexbyte1
433 // indexbyte2
434 //
435 // followed by an (optional) sequence of:
436 //
437 // aload_0
438 // aconst_null / iconst_0 / fconst_0 / dconst_0
439 // putfield
440 // indexbyte1
441 // indexbyte2
442 //
443 // followed by:
444 //
445 // return
446
447 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
448 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
449 int size = code_size();
450 // Check if size match
451 if (size == 0 || size % 5 != 0) return false;
452 address cb = code_base();
453 int last = size - 1;
454 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
455 // Does not call superclass default constructor
456 return false;
457 }
458 // Check optional sequence
459 for (int i = 4; i < last; i += 5) {
460 if (cb[i] != Bytecodes::_aload_0) return false;
461 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
462 if (cb[i+2] != Bytecodes::_putfield) return false;
463 }
464 return true;
465 }
466
467
468 bool Method::compute_has_loops_flag() {
469 BytecodeStream bcs(this);
470 Bytecodes::Code bc;
471
472 while ((bc = bcs.next()) >= 0) {
473 switch( bc ) {
474 case Bytecodes::_ifeq:
475 case Bytecodes::_ifnull:
476 case Bytecodes::_iflt:
477 case Bytecodes::_ifle:
478 case Bytecodes::_ifne:
479 case Bytecodes::_ifnonnull:
480 case Bytecodes::_ifgt:
481 case Bytecodes::_ifge:
482 case Bytecodes::_if_icmpeq:
483 case Bytecodes::_if_icmpne:
484 case Bytecodes::_if_icmplt:
485 case Bytecodes::_if_icmpgt:
486 case Bytecodes::_if_icmple:
487 case Bytecodes::_if_icmpge:
488 case Bytecodes::_if_acmpeq:
489 case Bytecodes::_if_acmpne:
490 case Bytecodes::_goto:
491 case Bytecodes::_jsr:
492 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
493 break;
494
495 case Bytecodes::_goto_w:
496 case Bytecodes::_jsr_w:
497 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
498 break;
499 }
500 }
501 _access_flags.set_loops_flag_init();
502 return _access_flags.has_loops();
503 }
504
505
506 bool Method::is_final_method() const {
507 // %%% Should return true for private methods also,
508 // since there is no way to override them.
509 return is_final() || method_holder()->is_final();
510 }
511
512
513 bool Method::is_strict_method() const {
514 return is_strict();
515 }
516
517
518 bool Method::can_be_statically_bound() const {
519 if (is_final_method()) return true;
520 return vtable_index() == nonvirtual_vtable_index;
521 }
522
523
524 bool Method::is_accessor() const {
525 if (code_size() != 5) return false;
526 if (size_of_parameters() != 1) return false;
527 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
528 if (java_code_at(1) != Bytecodes::_getfield) return false;
529 if (java_code_at(4) != Bytecodes::_areturn &&
530 java_code_at(4) != Bytecodes::_ireturn ) return false;
531 return true;
532 }
533
534
535 bool Method::is_initializer() const {
536 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
537 }
538
539 bool Method::has_valid_initializer_flags() const {
540 return (is_static() ||
541 method_holder()->major_version() < 51);
542 }
543
544 bool Method::is_static_initializer() const {
545 // For classfiles version 51 or greater, ensure that the clinit method is
546 // static. Non-static methods with the name "<clinit>" are not static
547 // initializers. (older classfiles exempted for backward compatibility)
548 return name() == vmSymbols::class_initializer_name() &&
549 has_valid_initializer_flags();
550 }
551
552
553 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) {
554 int length = this_oop->checked_exceptions_length();
555 if (length == 0) { // common case
556 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
557 } else {
558 methodHandle h_this(THREAD, this_oop);
559 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
560 objArrayHandle mirrors (THREAD, m_oop);
561 for (int i = 0; i < length; i++) {
562 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
563 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
564 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
565 mirrors->obj_at_put(i, k->java_mirror());
566 }
567 return mirrors;
568 }
569 };
570
571
572 int Method::line_number_from_bci(int bci) const {
573 if (bci == SynchronizationEntryBCI) bci = 0;
574 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
575 int best_bci = 0;
576 int best_line = -1;
577
578 if (has_linenumber_table()) {
579 // The line numbers are a short array of 2-tuples [start_pc, line_number].
580 // Not necessarily sorted and not necessarily one-to-one.
581 CompressedLineNumberReadStream stream(compressed_linenumber_table());
582 while (stream.read_pair()) {
583 if (stream.bci() == bci) {
584 // perfect match
585 return stream.line();
586 } else {
587 // update best_bci/line
588 if (stream.bci() < bci && stream.bci() >= best_bci) {
589 best_bci = stream.bci();
590 best_line = stream.line();
591 }
592 }
593 }
594 }
595 return best_line;
596 }
597
598
599 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
600 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
601 Thread *thread = Thread::current();
602 Symbol* klass_name = constants()->klass_name_at(klass_index);
603 Handle loader(thread, method_holder()->class_loader());
604 Handle prot (thread, method_holder()->protection_domain());
605 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
606 } else {
607 return true;
608 }
609 }
610
611
612 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
613 int klass_index = constants()->klass_ref_index_at(refinfo_index);
614 if (must_be_resolved) {
615 // Make sure klass is resolved in constantpool.
616 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
617 }
618 return is_klass_loaded_by_klass_index(klass_index);
619 }
620
621
622 void Method::set_native_function(address function, bool post_event_flag) {
623 assert(function != NULL, "use clear_native_function to unregister natives");
624 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
625 address* native_function = native_function_addr();
626
627 // We can see racers trying to place the same native function into place. Once
628 // is plenty.
629 address current = *native_function;
630 if (current == function) return;
631 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
632 function != NULL) {
633 // native_method_throw_unsatisfied_link_error_entry() should only
634 // be passed when post_event_flag is false.
635 assert(function !=
636 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
637 "post_event_flag mis-match");
638
639 // post the bind event, and possible change the bind function
640 JvmtiExport::post_native_method_bind(this, &function);
641 }
642 *native_function = function;
643 // This function can be called more than once. We must make sure that we always
644 // use the latest registered method -> check if a stub already has been generated.
645 // If so, we have to make it not_entrant.
646 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
647 if (nm != NULL) {
648 nm->make_not_entrant();
649 }
650 }
651
652
653 bool Method::has_native_function() const {
654 if (is_method_handle_intrinsic())
655 return false; // special-cased in SharedRuntime::generate_native_wrapper
656 address func = native_function();
657 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
658 }
659
660
661 void Method::clear_native_function() {
662 // Note: is_method_handle_intrinsic() is allowed here.
663 set_native_function(
664 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
665 !native_bind_event_is_interesting);
666 clear_code();
667 }
668
669 address Method::critical_native_function() {
670 methodHandle mh(this);
671 return NativeLookup::lookup_critical_entry(mh);
672 }
673
674
675 void Method::set_signature_handler(address handler) {
676 address* signature_handler = signature_handler_addr();
677 *signature_handler = handler;
678 }
679
680
681 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
682 if (PrintCompilation && report) {
683 ttyLocker ttyl;
684 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
685 if (comp_level == CompLevel_all) {
686 tty->print("all levels ");
687 } else {
688 tty->print("levels ");
689 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
690 tty->print("%d ", i);
691 }
692 }
693 this->print_short_name(tty);
694 int size = this->code_size();
695 if (size > 0) {
696 tty->print(" (%d bytes)", size);
697 }
698 if (reason != NULL) {
699 tty->print(" %s", reason);
700 }
701 tty->cr();
702 }
703 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
704 ttyLocker ttyl;
705 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'",
706 is_osr ? "osr_" : "", os::current_thread_id());
707 if (reason != NULL) {
708 xtty->print(" reason=\'%s\'", reason);
709 }
710 xtty->method(this);
711 xtty->stamp();
712 xtty->end_elem();
713 }
714 }
715
716 bool Method::is_not_compilable(int comp_level) const {
717 if (number_of_breakpoints() > 0)
718 return true;
719 if (is_method_handle_intrinsic())
720 return !is_synthetic(); // the generated adapters must be compiled
721 if (comp_level == CompLevel_any)
722 return is_not_c1_compilable() || is_not_c2_compilable();
723 if (is_c1_compile(comp_level))
724 return is_not_c1_compilable();
725 if (is_c2_compile(comp_level))
726 return is_not_c2_compilable();
727 return false;
728 }
729
730 // call this when compiler finds that this method is not compilable
731 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
732 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
733 if (comp_level == CompLevel_all) {
734 set_not_c1_compilable();
735 set_not_c2_compilable();
736 } else {
737 if (is_c1_compile(comp_level))
738 set_not_c1_compilable();
739 if (is_c2_compile(comp_level))
740 set_not_c2_compilable();
741 }
742 CompilationPolicy::policy()->disable_compilation(this);
743 }
744
745 bool Method::is_not_osr_compilable(int comp_level) const {
746 if (is_not_compilable(comp_level))
747 return true;
748 if (comp_level == CompLevel_any)
749 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
750 if (is_c1_compile(comp_level))
751 return is_not_c1_osr_compilable();
752 if (is_c2_compile(comp_level))
753 return is_not_c2_osr_compilable();
754 return false;
755 }
756
757 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
758 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
759 if (comp_level == CompLevel_all) {
760 set_not_c1_osr_compilable();
761 set_not_c2_osr_compilable();
762 } else {
763 if (is_c1_compile(comp_level))
764 set_not_c1_osr_compilable();
765 if (is_c2_compile(comp_level))
766 set_not_c2_osr_compilable();
767 }
768 CompilationPolicy::policy()->disable_compilation(this);
769 }
770
771 // Revert to using the interpreter and clear out the nmethod
772 void Method::clear_code() {
773
774 // this may be NULL if c2i adapters have not been made yet
775 // Only should happen at allocate time.
776 if (_adapter == NULL) {
777 _from_compiled_entry = NULL;
778 } else {
779 _from_compiled_entry = _adapter->get_c2i_entry();
780 }
781 OrderAccess::storestore();
782 _from_interpreted_entry = _i2i_entry;
783 OrderAccess::storestore();
784 _code = NULL;
785 }
786
787 // Called by class data sharing to remove any entry points (which are not shared)
788 void Method::unlink_method() {
789 _code = NULL;
790 _i2i_entry = NULL;
791 _from_interpreted_entry = NULL;
792 if (is_native()) {
793 *native_function_addr() = NULL;
794 set_signature_handler(NULL);
795 }
796 NOT_PRODUCT(set_compiled_invocation_count(0);)
797 invocation_counter()->reset();
798 backedge_counter()->reset();
799 _adapter = NULL;
800 _from_compiled_entry = NULL;
801
802 // In case of DumpSharedSpaces, _method_data should always be NULL.
803 //
804 // During runtime (!DumpSharedSpaces), when we are cleaning a
805 // shared class that failed to load, this->link_method() may
806 // have already been called (before an exception happened), so
807 // this->_method_data may not be NULL.
808 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?");
809
810 set_method_data(NULL);
811 set_interpreter_throwout_count(0);
812 set_interpreter_invocation_count(0);
813 }
814
815 // Called when the method_holder is getting linked. Setup entrypoints so the method
816 // is ready to be called from interpreter, compiler, and vtables.
817 void Method::link_method(methodHandle h_method, TRAPS) {
818 // If the code cache is full, we may reenter this function for the
819 // leftover methods that weren't linked.
820 if (_i2i_entry != NULL) return;
821
822 assert(_adapter == NULL, "init'd to NULL" );
823 assert( _code == NULL, "nothing compiled yet" );
824
825 // Setup interpreter entrypoint
826 assert(this == h_method(), "wrong h_method()" );
827 address entry = Interpreter::entry_for_method(h_method);
828 assert(entry != NULL, "interpreter entry must be non-null");
829 // Sets both _i2i_entry and _from_interpreted_entry
830 set_interpreter_entry(entry);
831 if (is_native() && !is_method_handle_intrinsic()) {
832 set_native_function(
833 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
834 !native_bind_event_is_interesting);
835 }
836
837 // Setup compiler entrypoint. This is made eagerly, so we do not need
838 // special handling of vtables. An alternative is to make adapters more
839 // lazily by calling make_adapter() from from_compiled_entry() for the
840 // normal calls. For vtable calls life gets more complicated. When a
841 // call-site goes mega-morphic we need adapters in all methods which can be
842 // called from the vtable. We need adapters on such methods that get loaded
843 // later. Ditto for mega-morphic itable calls. If this proves to be a
844 // problem we'll make these lazily later.
845 (void) make_adapters(h_method, CHECK);
846
847 // ONLY USE the h_method now as make_adapter may have blocked
848
849 }
850
851 address Method::make_adapters(methodHandle mh, TRAPS) {
852 // Adapters for compiled code are made eagerly here. They are fairly
853 // small (generally < 100 bytes) and quick to make (and cached and shared)
854 // so making them eagerly shouldn't be too expensive.
855 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
856 if (adapter == NULL ) {
857 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
858 }
859
860 mh->set_adapter_entry(adapter);
861 mh->_from_compiled_entry = adapter->get_c2i_entry();
862 return adapter->get_c2i_entry();
863 }
864
865 // The verified_code_entry() must be called when a invoke is resolved
866 // on this method.
867
868 // It returns the compiled code entry point, after asserting not null.
869 // This function is called after potential safepoints so that nmethod
870 // or adapter that it points to is still live and valid.
871 // This function must not hit a safepoint!
872 address Method::verified_code_entry() {
873 debug_only(No_Safepoint_Verifier nsv;)
874 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
875 if (code == NULL && UseCodeCacheFlushing) {
876 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this);
877 if (saved_code != NULL) {
878 methodHandle method(this);
879 assert( ! saved_code->is_osr_method(), "should not get here for osr" );
880 set_code( method, saved_code );
881 }
882 }
883
884 assert(_from_compiled_entry != NULL, "must be set");
885 return _from_compiled_entry;
886 }
887
888 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
889 // (could be racing a deopt).
890 // Not inline to avoid circular ref.
891 bool Method::check_code() const {
892 // cached in a register or local. There's a race on the value of the field.
893 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
894 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
895 }
896
897 // Install compiled code. Instantly it can execute.
898 void Method::set_code(methodHandle mh, nmethod *code) {
899 assert( code, "use clear_code to remove code" );
900 assert( mh->check_code(), "" );
901
902 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
903
904 // These writes must happen in this order, because the interpreter will
905 // directly jump to from_interpreted_entry which jumps to an i2c adapter
906 // which jumps to _from_compiled_entry.
907 mh->_code = code; // Assign before allowing compiled code to exec
908
909 int comp_level = code->comp_level();
910 // In theory there could be a race here. In practice it is unlikely
911 // and not worth worrying about.
912 if (comp_level > mh->highest_comp_level()) {
913 mh->set_highest_comp_level(comp_level);
914 }
915
916 OrderAccess::storestore();
917 #ifdef SHARK
918 mh->_from_interpreted_entry = code->insts_begin();
919 #else //!SHARK
920 mh->_from_compiled_entry = code->verified_entry_point();
921 OrderAccess::storestore();
922 // Instantly compiled code can execute.
923 if (!mh->is_method_handle_intrinsic())
924 mh->_from_interpreted_entry = mh->get_i2c_entry();
925 #endif //!SHARK
926 }
927
928
929 bool Method::is_overridden_in(Klass* k) const {
930 InstanceKlass* ik = InstanceKlass::cast(k);
931
932 if (ik->is_interface()) return false;
933
934 // If method is an interface, we skip it - except if it
935 // is a miranda method
936 if (method_holder()->is_interface()) {
937 // Check that method is not a miranda method
938 if (ik->lookup_method(name(), signature()) == NULL) {
939 // No implementation exist - so miranda method
940 return false;
941 }
942 return true;
943 }
944
945 assert(ik->is_subclass_of(method_holder()), "should be subklass");
946 assert(ik->vtable() != NULL, "vtable should exist");
947 if (vtable_index() == nonvirtual_vtable_index) {
948 return false;
949 } else {
950 Method* vt_m = ik->method_at_vtable(vtable_index());
951 return vt_m != this;
952 }
953 }
954
955
956 // give advice about whether this Method* should be cached or not
957 bool Method::should_not_be_cached() const {
958 if (is_old()) {
959 // This method has been redefined. It is either EMCP or obsolete
960 // and we don't want to cache it because that would pin the method
961 // down and prevent it from being collectible if and when it
962 // finishes executing.
963 return true;
964 }
965
966 // caching this method should be just fine
967 return false;
968 }
969
970 // Constant pool structure for invoke methods:
971 enum {
972 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
973 _imcp_invoke_signature, // utf8: (variable Symbol*)
974 _imcp_limit
975 };
976
977 // Test if this method is an MH adapter frame generated by Java code.
978 // Cf. java/lang/invoke/InvokerBytecodeGenerator
979 bool Method::is_compiled_lambda_form() const {
980 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
981 }
982
983 // Test if this method is an internal MH primitive method.
984 bool Method::is_method_handle_intrinsic() const {
985 vmIntrinsics::ID iid = intrinsic_id();
986 return (MethodHandles::is_signature_polymorphic(iid) &&
987 MethodHandles::is_signature_polymorphic_intrinsic(iid));
988 }
989
990 bool Method::has_member_arg() const {
991 vmIntrinsics::ID iid = intrinsic_id();
992 return (MethodHandles::is_signature_polymorphic(iid) &&
993 MethodHandles::has_member_arg(iid));
994 }
995
996 // Make an instance of a signature-polymorphic internal MH primitive.
997 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
998 Symbol* signature,
999 TRAPS) {
1000 ResourceMark rm;
1001 methodHandle empty;
1002
1003 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1004 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1005 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1006 if (TraceMethodHandles) {
1007 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1008 }
1009
1010 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1011 name->increment_refcount();
1012 signature->increment_refcount();
1013
1014 int cp_length = _imcp_limit;
1015 ClassLoaderData* loader_data = holder->class_loader_data();
1016 constantPoolHandle cp;
1017 {
1018 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1019 cp = constantPoolHandle(THREAD, cp_oop);
1020 }
1021 cp->set_pool_holder(InstanceKlass::cast(holder()));
1022 cp->symbol_at_put(_imcp_invoke_name, name);
1023 cp->symbol_at_put(_imcp_invoke_signature, signature);
1024 cp->set_has_preresolution();
1025
1026 // decide on access bits: public or not?
1027 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1028 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1029 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1030 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1031
1032 methodHandle m;
1033 {
1034 InlineTableSizes sizes;
1035 Method* m_oop = Method::allocate(loader_data, 0,
1036 accessFlags_from(flags_bits), &sizes,
1037 ConstMethod::NORMAL, CHECK_(empty));
1038 m = methodHandle(THREAD, m_oop);
1039 }
1040 m->set_constants(cp());
1041 m->set_name_index(_imcp_invoke_name);
1042 m->set_signature_index(_imcp_invoke_signature);
1043 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1044 assert(m->signature() == signature, "");
1045 #ifdef CC_INTERP
1046 ResultTypeFinder rtf(signature);
1047 m->set_result_index(rtf.type());
1048 #endif
1049 m->compute_size_of_parameters(THREAD);
1050 m->init_intrinsic_id();
1051 assert(m->is_method_handle_intrinsic(), "");
1052 #ifdef ASSERT
1053 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1054 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1055 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1056 #endif //ASSERT
1057
1058 // Finally, set up its entry points.
1059 assert(m->can_be_statically_bound(), "");
1060 m->set_vtable_index(Method::nonvirtual_vtable_index);
1061 m->link_method(m, CHECK_(empty));
1062
1063 if (TraceMethodHandles && (Verbose || WizardMode))
1064 m->print_on(tty);
1065
1066 return m;
1067 }
1068
1069 Klass* Method::check_non_bcp_klass(Klass* klass) {
1070 if (klass != NULL && klass->class_loader() != NULL) {
1071 if (klass->oop_is_objArray())
1072 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1073 return klass;
1074 }
1075 return NULL;
1076 }
1077
1078
1079 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1080 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1081 // Code below does not work for native methods - they should never get rewritten anyway
1082 assert(!m->is_native(), "cannot rewrite native methods");
1083 // Allocate new Method*
1084 AccessFlags flags = m->access_flags();
1085
1086 ConstMethod* cm = m->constMethod();
1087 int checked_exceptions_len = cm->checked_exceptions_length();
1088 int localvariable_len = cm->localvariable_table_length();
1089 int exception_table_len = cm->exception_table_length();
1090 int method_parameters_len = cm->method_parameters_length();
1091 int method_annotations_len = cm->method_annotations_length();
1092 int parameter_annotations_len = cm->parameter_annotations_length();
1093 int type_annotations_len = cm->type_annotations_length();
1094 int default_annotations_len = cm->default_annotations_length();
1095
1096 InlineTableSizes sizes(
1097 localvariable_len,
1098 new_compressed_linenumber_size,
1099 exception_table_len,
1100 checked_exceptions_len,
1101 method_parameters_len,
1102 cm->generic_signature_index(),
1103 method_annotations_len,
1104 parameter_annotations_len,
1105 type_annotations_len,
1106 default_annotations_len,
1107 0);
1108
1109 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1110 Method* newm_oop = Method::allocate(loader_data,
1111 new_code_length,
1112 flags,
1113 &sizes,
1114 m->method_type(),
1115 CHECK_(methodHandle()));
1116 methodHandle newm (THREAD, newm_oop);
1117 int new_method_size = newm->method_size();
1118
1119 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1120 ConstMethod* newcm = newm->constMethod();
1121 int new_const_method_size = newm->constMethod()->size();
1122
1123 memcpy(newm(), m(), sizeof(Method));
1124
1125 // Create shallow copy of ConstMethod.
1126 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1127
1128 // Reset correct method/const method, method size, and parameter info
1129 newm->set_constMethod(newcm);
1130 newm->constMethod()->set_code_size(new_code_length);
1131 newm->constMethod()->set_constMethod_size(new_const_method_size);
1132 newm->set_method_size(new_method_size);
1133 assert(newm->code_size() == new_code_length, "check");
1134 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1135 assert(newm->exception_table_length() == exception_table_len, "check");
1136 assert(newm->localvariable_table_length() == localvariable_len, "check");
1137 // Copy new byte codes
1138 memcpy(newm->code_base(), new_code, new_code_length);
1139 // Copy line number table
1140 if (new_compressed_linenumber_size > 0) {
1141 memcpy(newm->compressed_linenumber_table(),
1142 new_compressed_linenumber_table,
1143 new_compressed_linenumber_size);
1144 }
1145 // Copy checked_exceptions
1146 if (checked_exceptions_len > 0) {
1147 memcpy(newm->checked_exceptions_start(),
1148 m->checked_exceptions_start(),
1149 checked_exceptions_len * sizeof(CheckedExceptionElement));
1150 }
1151 // Copy exception table
1152 if (exception_table_len > 0) {
1153 memcpy(newm->exception_table_start(),
1154 m->exception_table_start(),
1155 exception_table_len * sizeof(ExceptionTableElement));
1156 }
1157 // Copy local variable number table
1158 if (localvariable_len > 0) {
1159 memcpy(newm->localvariable_table_start(),
1160 m->localvariable_table_start(),
1161 localvariable_len * sizeof(LocalVariableTableElement));
1162 }
1163 // Copy stackmap table
1164 if (m->has_stackmap_table()) {
1165 int code_attribute_length = m->stackmap_data()->length();
1166 Array<u1>* stackmap_data =
1167 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1168 memcpy((void*)stackmap_data->adr_at(0),
1169 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1170 newm->set_stackmap_data(stackmap_data);
1171 }
1172
1173 return newm;
1174 }
1175
1176 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1177 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1178 // because we are not loading from core libraries
1179 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1180 // which does not use the class default class loader so we check for its loader here
1181 if ((InstanceKlass::cast(holder)->class_loader() != NULL) &&
1182 InstanceKlass::cast(holder)->class_loader()->klass()->name() != vmSymbols::sun_misc_Launcher_ExtClassLoader()) {
1183 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1184 }
1185
1186 // see if the klass name is well-known:
1187 Symbol* klass_name = InstanceKlass::cast(holder)->name();
1188 return vmSymbols::find_sid(klass_name);
1189 }
1190
1191 void Method::init_intrinsic_id() {
1192 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1193 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1194 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1195 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1196
1197 // the klass name is well-known:
1198 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1199 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1200
1201 // ditto for method and signature:
1202 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1203 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1204 && name_id == vmSymbols::NO_SID)
1205 return;
1206 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1207 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1208 && sig_id == vmSymbols::NO_SID) return;
1209 jshort flags = access_flags().as_short();
1210
1211 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1212 if (id != vmIntrinsics::_none) {
1213 set_intrinsic_id(id);
1214 return;
1215 }
1216
1217 // A few slightly irregular cases:
1218 switch (klass_id) {
1219 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1220 // Second chance: check in regular Math.
1221 switch (name_id) {
1222 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1223 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1224 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1225 // pretend it is the corresponding method in the non-strict class:
1226 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1227 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1228 break;
1229 }
1230 break;
1231
1232 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1233 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1234 if (!is_native()) break;
1235 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1236 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1237 id = vmIntrinsics::_none;
1238 break;
1239 }
1240
1241 if (id != vmIntrinsics::_none) {
1242 // Set up its iid. It is an alias method.
1243 set_intrinsic_id(id);
1244 return;
1245 }
1246 }
1247
1248 // These two methods are static since a GC may move the Method
1249 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1250 if (THREAD->is_Compiler_thread()) {
1251 // There is nothing useful this routine can do from within the Compile thread.
1252 // Hopefully, the signature contains only well-known classes.
1253 // We could scan for this and return true/false, but the caller won't care.
1254 return false;
1255 }
1256 bool sig_is_loaded = true;
1257 Handle class_loader(THREAD, m->method_holder()->class_loader());
1258 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1259 ResourceMark rm(THREAD);
1260 Symbol* signature = m->signature();
1261 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1262 if (ss.is_object()) {
1263 Symbol* sym = ss.as_symbol(CHECK_(false));
1264 Symbol* name = sym;
1265 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1266 protection_domain, THREAD);
1267 // We are loading classes eagerly. If a ClassNotFoundException or
1268 // a LinkageError was generated, be sure to ignore it.
1269 if (HAS_PENDING_EXCEPTION) {
1270 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1271 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1272 CLEAR_PENDING_EXCEPTION;
1273 } else {
1274 return false;
1275 }
1276 }
1277 if( klass == NULL) { sig_is_loaded = false; }
1278 }
1279 }
1280 return sig_is_loaded;
1281 }
1282
1283 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1284 Handle class_loader(THREAD, m->method_holder()->class_loader());
1285 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1286 ResourceMark rm(THREAD);
1287 Symbol* signature = m->signature();
1288 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1289 if (ss.type() == T_OBJECT) {
1290 Symbol* name = ss.as_symbol_or_null();
1291 if (name == NULL) return true;
1292 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1293 if (klass == NULL) return true;
1294 }
1295 }
1296 return false;
1297 }
1298
1299 // Exposed so field engineers can debug VM
1300 void Method::print_short_name(outputStream* st) {
1301 ResourceMark rm;
1302 #ifdef PRODUCT
1303 st->print(" %s::", method_holder()->external_name());
1304 #else
1305 st->print(" %s::", method_holder()->internal_name());
1306 #endif
1307 name()->print_symbol_on(st);
1308 if (WizardMode) signature()->print_symbol_on(st);
1309 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1310 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1311 }
1312
1313 // Comparer for sorting an object array containing
1314 // Method*s.
1315 static int method_comparator(Method* a, Method* b) {
1316 return a->name()->fast_compare(b->name());
1317 }
1318
1319 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1320 void Method::sort_methods(Array<Method*>* methods, bool idempotent) {
1321 int length = methods->length();
1322 if (length > 1) {
1323 {
1324 No_Safepoint_Verifier nsv;
1325 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1326 }
1327 // Reset method ordering
1328 for (int i = 0; i < length; i++) {
1329 Method* m = methods->at(i);
1330 m->set_method_idnum(i);
1331 }
1332 }
1333 }
1334
1335
1336 //-----------------------------------------------------------------------------------
1337 // Non-product code unless JVM/TI needs it
1338
1339 #if !defined(PRODUCT) || INCLUDE_JVMTI
1340 class SignatureTypePrinter : public SignatureTypeNames {
1341 private:
1342 outputStream* _st;
1343 bool _use_separator;
1344
1345 void type_name(const char* name) {
1346 if (_use_separator) _st->print(", ");
1347 _st->print(name);
1348 _use_separator = true;
1349 }
1350
1351 public:
1352 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1353 _st = st;
1354 _use_separator = false;
1355 }
1356
1357 void print_parameters() { _use_separator = false; iterate_parameters(); }
1358 void print_returntype() { _use_separator = false; iterate_returntype(); }
1359 };
1360
1361
1362 void Method::print_name(outputStream* st) {
1363 Thread *thread = Thread::current();
1364 ResourceMark rm(thread);
1365 SignatureTypePrinter sig(signature(), st);
1366 st->print("%s ", is_static() ? "static" : "virtual");
1367 sig.print_returntype();
1368 st->print(" %s.", method_holder()->internal_name());
1369 name()->print_symbol_on(st);
1370 st->print("(");
1371 sig.print_parameters();
1372 st->print(")");
1373 }
1374 #endif // !PRODUCT || INCLUDE_JVMTI
1375
1376
1377 //-----------------------------------------------------------------------------------
1378 // Non-product code
1379
1380 #ifndef PRODUCT
1381 void Method::print_codes_on(outputStream* st) const {
1382 print_codes_on(0, code_size(), st);
1383 }
1384
1385 void Method::print_codes_on(int from, int to, outputStream* st) const {
1386 Thread *thread = Thread::current();
1387 ResourceMark rm(thread);
1388 methodHandle mh (thread, (Method*)this);
1389 BytecodeStream s(mh);
1390 s.set_interval(from, to);
1391 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1392 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1393 }
1394 #endif // not PRODUCT
1395
1396
1397 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1398 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1399 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1400 // as end-of-stream terminator.
1401
1402 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1403 // bci and line number does not compress into single byte.
1404 // Write out escape character and use regular compression for bci and line number.
1405 write_byte((jubyte)0xFF);
1406 write_signed_int(bci_delta);
1407 write_signed_int(line_delta);
1408 }
1409
1410 // See comment in method.hpp which explains why this exists.
1411 #if defined(_M_AMD64) && _MSC_VER >= 1400
1412 #pragma optimize("", off)
1413 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1414 write_pair_inline(bci, line);
1415 }
1416 #pragma optimize("", on)
1417 #endif
1418
1419 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1420 _bci = 0;
1421 _line = 0;
1422 };
1423
1424
1425 bool CompressedLineNumberReadStream::read_pair() {
1426 jubyte next = read_byte();
1427 // Check for terminator
1428 if (next == 0) return false;
1429 if (next == 0xFF) {
1430 // Escape character, regular compression used
1431 _bci += read_signed_int();
1432 _line += read_signed_int();
1433 } else {
1434 // Single byte compression used
1435 _bci += next >> 3;
1436 _line += next & 0x7;
1437 }
1438 return true;
1439 }
1440
1441
1442 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1443 BreakpointInfo* bp = method_holder()->breakpoints();
1444 for (; bp != NULL; bp = bp->next()) {
1445 if (bp->match(this, bci)) {
1446 return bp->orig_bytecode();
1447 }
1448 }
1449 ShouldNotReachHere();
1450 return Bytecodes::_shouldnotreachhere;
1451 }
1452
1453 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1454 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1455 BreakpointInfo* bp = method_holder()->breakpoints();
1456 for (; bp != NULL; bp = bp->next()) {
1457 if (bp->match(this, bci)) {
1458 bp->set_orig_bytecode(code);
1459 // and continue, in case there is more than one
1460 }
1461 }
1462 }
1463
1464 void Method::set_breakpoint(int bci) {
1465 InstanceKlass* ik = method_holder();
1466 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1467 bp->set_next(ik->breakpoints());
1468 ik->set_breakpoints(bp);
1469 // do this last:
1470 bp->set(this);
1471 }
1472
1473 static void clear_matches(Method* m, int bci) {
1474 InstanceKlass* ik = m->method_holder();
1475 BreakpointInfo* prev_bp = NULL;
1476 BreakpointInfo* next_bp;
1477 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1478 next_bp = bp->next();
1479 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1480 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1481 // do this first:
1482 bp->clear(m);
1483 // unhook it
1484 if (prev_bp != NULL)
1485 prev_bp->set_next(next_bp);
1486 else
1487 ik->set_breakpoints(next_bp);
1488 delete bp;
1489 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1490 // at same location. So we have multiple matching (method_index and bci)
1491 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1492 // breakpoint for clear_breakpoint request and keep all other method versions
1493 // BreakpointInfo for future clear_breakpoint request.
1494 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1495 // which is being called when class is unloaded. We delete all the Breakpoint
1496 // information for all versions of method. We may not correctly restore the original
1497 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1498 // so these methods won't be used anymore.
1499 if (bci >= 0) {
1500 break;
1501 }
1502 } else {
1503 // This one is a keeper.
1504 prev_bp = bp;
1505 }
1506 }
1507 }
1508
1509 void Method::clear_breakpoint(int bci) {
1510 assert(bci >= 0, "");
1511 clear_matches(this, bci);
1512 }
1513
1514 void Method::clear_all_breakpoints() {
1515 clear_matches(this, -1);
1516 }
1517
1518
1519 int Method::invocation_count() {
1520 if (TieredCompilation) {
1521 MethodData* const mdo = method_data();
1522 if (invocation_counter()->carry() || ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1523 return InvocationCounter::count_limit;
1524 } else {
1525 return invocation_counter()->count() + ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1526 }
1527 } else {
1528 return invocation_counter()->count();
1529 }
1530 }
1531
1532 int Method::backedge_count() {
1533 if (TieredCompilation) {
1534 MethodData* const mdo = method_data();
1535 if (backedge_counter()->carry() || ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1536 return InvocationCounter::count_limit;
1537 } else {
1538 return backedge_counter()->count() + ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1539 }
1540 } else {
1541 return backedge_counter()->count();
1542 }
1543 }
1544
1545 int Method::highest_comp_level() const {
1546 MethodData* mdo = method_data();
1547 if (mdo != NULL) {
1548 return mdo->highest_comp_level();
1549 } else {
1550 return CompLevel_none;
1551 }
1552 }
1553
1554 int Method::highest_osr_comp_level() const {
1555 MethodData* mdo = method_data();
1556 if (mdo != NULL) {
1557 return mdo->highest_osr_comp_level();
1558 } else {
1559 return CompLevel_none;
1560 }
1561 }
1562
1563 void Method::set_highest_comp_level(int level) {
1564 MethodData* mdo = method_data();
1565 if (mdo != NULL) {
1566 mdo->set_highest_comp_level(level);
1567 }
1568 }
1569
1570 void Method::set_highest_osr_comp_level(int level) {
1571 MethodData* mdo = method_data();
1572 if (mdo != NULL) {
1573 mdo->set_highest_osr_comp_level(level);
1574 }
1575 }
1576
1577 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1578 _bci = bci;
1579 _name_index = m->name_index();
1580 _signature_index = m->signature_index();
1581 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1582 if (_orig_bytecode == Bytecodes::_breakpoint)
1583 _orig_bytecode = m->orig_bytecode_at(_bci);
1584 _next = NULL;
1585 }
1586
1587 void BreakpointInfo::set(Method* method) {
1588 #ifdef ASSERT
1589 {
1590 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1591 if (code == Bytecodes::_breakpoint)
1592 code = method->orig_bytecode_at(_bci);
1593 assert(orig_bytecode() == code, "original bytecode must be the same");
1594 }
1595 #endif
1596 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1597 method->incr_number_of_breakpoints();
1598 SystemDictionary::notice_modification();
1599 {
1600 // Deoptimize all dependents on this method
1601 Thread *thread = Thread::current();
1602 HandleMark hm(thread);
1603 methodHandle mh(thread, method);
1604 Universe::flush_dependents_on_method(mh);
1605 }
1606 }
1607
1608 void BreakpointInfo::clear(Method* method) {
1609 *method->bcp_from(_bci) = orig_bytecode();
1610 assert(method->number_of_breakpoints() > 0, "must not go negative");
1611 method->decr_number_of_breakpoints();
1612 }
1613
1614 // jmethodID handling
1615
1616 // This is a block allocating object, sort of like JNIHandleBlock, only a
1617 // lot simpler. There aren't many of these, they aren't long, they are rarely
1618 // deleted and so we can do some suboptimal things.
1619 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1620 // never get rid of it.
1621 // It would be nice to be able to parameterize the number of methods for
1622 // the null_class_loader but then we'd have to turn this and ClassLoaderData
1623 // into templates.
1624
1625 // I feel like this brain dead class should exist somewhere in the STL
1626
1627 class JNIMethodBlock : public CHeapObj<mtClass> {
1628 enum { number_of_methods = 8 };
1629
1630 Method* _methods[number_of_methods];
1631 int _top;
1632 JNIMethodBlock* _next;
1633 public:
1634 static Method* const _free_method;
1635
1636 JNIMethodBlock() : _next(NULL), _top(0) {
1637 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method;
1638 }
1639
1640 Method** add_method(Method* m) {
1641 if (_top < number_of_methods) {
1642 // top points to the next free entry.
1643 int i = _top;
1644 _methods[i] = m;
1645 _top++;
1646 return &_methods[i];
1647 } else if (_top == number_of_methods) {
1648 // if the next free entry ran off the block see if there's a free entry
1649 for (int i = 0; i< number_of_methods; i++) {
1650 if (_methods[i] == _free_method) {
1651 _methods[i] = m;
1652 return &_methods[i];
1653 }
1654 }
1655 // Only check each block once for frees. They're very unlikely.
1656 // Increment top past the end of the block.
1657 _top++;
1658 }
1659 // need to allocate a next block.
1660 if (_next == NULL) {
1661 _next = new JNIMethodBlock();
1662 }
1663 return _next->add_method(m);
1664 }
1665
1666 bool contains(Method** m) {
1667 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1668 for (int i = 0; i< number_of_methods; i++) {
1669 if (&(b->_methods[i]) == m) {
1670 return true;
1671 }
1672 }
1673 }
1674 return false; // not found
1675 }
1676
1677 // Doesn't really destroy it, just marks it as free so it can be reused.
1678 void destroy_method(Method** m) {
1679 #ifdef ASSERT
1680 assert(contains(m), "should be a methodID");
1681 #endif // ASSERT
1682 *m = _free_method;
1683 }
1684
1685 // During class unloading the methods are cleared, which is different
1686 // than freed.
1687 void clear_all_methods() {
1688 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1689 for (int i = 0; i< number_of_methods; i++) {
1690 _methods[i] = NULL;
1691 }
1692 }
1693 }
1694 #ifndef PRODUCT
1695 int count_methods() {
1696 // count all allocated methods
1697 int count = 0;
1698 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1699 for (int i = 0; i< number_of_methods; i++) {
1700 if (_methods[i] != _free_method) count++;
1701 }
1702 }
1703 return count;
1704 }
1705 #endif // PRODUCT
1706 };
1707
1708 // Something that can't be mistaken for an address or a markOop
1709 Method* const JNIMethodBlock::_free_method = (Method*)55;
1710
1711 // Add a method id to the jmethod_ids
1712 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
1713 ClassLoaderData* cld = loader_data;
1714
1715 if (!SafepointSynchronize::is_at_safepoint()) {
1716 // Have to add jmethod_ids() to class loader data thread-safely.
1717 // Also have to add the method to the list safely, which the cld lock
1718 // protects as well.
1719 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1720 if (cld->jmethod_ids() == NULL) {
1721 cld->set_jmethod_ids(new JNIMethodBlock());
1722 }
1723 // jmethodID is a pointer to Method*
1724 return (jmethodID)cld->jmethod_ids()->add_method(m);
1725 } else {
1726 // At safepoint, we are single threaded and can set this.
1727 if (cld->jmethod_ids() == NULL) {
1728 cld->set_jmethod_ids(new JNIMethodBlock());
1729 }
1730 // jmethodID is a pointer to Method*
1731 return (jmethodID)cld->jmethod_ids()->add_method(m);
1732 }
1733 }
1734
1735 // Mark a jmethodID as free. This is called when there is a data race in
1736 // InstanceKlass while creating the jmethodID cache.
1737 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
1738 ClassLoaderData* cld = loader_data;
1739 Method** ptr = (Method**)m;
1740 assert(cld->jmethod_ids() != NULL, "should have method handles");
1741 cld->jmethod_ids()->destroy_method(ptr);
1742 }
1743
1744 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
1745 // Can't assert the method_holder is the same because the new method has the
1746 // scratch method holder.
1747 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
1748 == new_method->method_holder()->class_loader(),
1749 "changing to a different class loader");
1750 // Just change the method in place, jmethodID pointer doesn't change.
1751 *((Method**)jmid) = new_method;
1752 }
1753
1754 bool Method::is_method_id(jmethodID mid) {
1755 Method* m = resolve_jmethod_id(mid);
1756 assert(m != NULL, "should be called with non-null method");
1757 InstanceKlass* ik = m->method_holder();
1758 ClassLoaderData* cld = ik->class_loader_data();
1759 if (cld->jmethod_ids() == NULL) return false;
1760 return (cld->jmethod_ids()->contains((Method**)mid));
1761 }
1762
1763 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
1764 if (mid == NULL) return NULL;
1765 Method* o = resolve_jmethod_id(mid);
1766 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
1767 return NULL;
1768 }
1769 return o;
1770 };
1771
1772 void Method::set_on_stack(const bool value) {
1773 // Set both the method itself and its constant pool. The constant pool
1774 // on stack means some method referring to it is also on the stack.
1775 _access_flags.set_on_stack(value);
1776 constants()->set_on_stack(value);
1777 if (value) MetadataOnStackMark::record(this);
1778 }
1779
1780 // Called when the class loader is unloaded to make all methods weak.
1781 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1782 loader_data->jmethod_ids()->clear_all_methods();
1783 }
1784
1785
1786 // Check that this pointer is valid by checking that the vtbl pointer matches
1787 bool Method::is_valid_method() const {
1788 if (this == NULL) {
1789 return false;
1790 } else if (!is_metaspace_object()) {
1791 return false;
1792 } else {
1793 Method m;
1794 // This assumes that the vtbl pointer is the first word of a C++ object.
1795 // This assumption is also in universe.cpp patch_klass_vtble
1796 void* vtbl2 = dereference_vptr((void*)&m);
1797 void* this_vtbl = dereference_vptr((void*)this);
1798 return vtbl2 == this_vtbl;
1799 }
1800 }
1801
1802 #ifndef PRODUCT
1803 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1804 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1805 }
1806 #endif // PRODUCT
1807
1808
1809 // Printing
1810
1811 #ifndef PRODUCT
1812
1813 void Method::print_on(outputStream* st) const {
1814 ResourceMark rm;
1815 assert(is_method(), "must be method");
1816 st->print_cr(internal_name());
1817 // get the effect of PrintOopAddress, always, for methods:
1818 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this);
1819 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
1820 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants());
1821 constants()->print_value_on(st); st->cr();
1822 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
1823 st->print (" - name: "); name()->print_value_on(st); st->cr();
1824 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
1825 st->print_cr(" - max stack: %d", max_stack());
1826 st->print_cr(" - max locals: %d", max_locals());
1827 st->print_cr(" - size of params: %d", size_of_parameters());
1828 st->print_cr(" - method size: %d", method_size());
1829 if (intrinsic_id() != vmIntrinsics::_none)
1830 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
1831 if (highest_comp_level() != CompLevel_none)
1832 st->print_cr(" - highest level: %d", highest_comp_level());
1833 st->print_cr(" - vtable index: %d", _vtable_index);
1834 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
1835 st->print( " - adapters: ");
1836 AdapterHandlerEntry* a = ((Method*)this)->adapter();
1837 if (a == NULL)
1838 st->print_cr(INTPTR_FORMAT, a);
1839 else
1840 a->print_adapter_on(st);
1841 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
1842 st->print_cr(" - code size: %d", code_size());
1843 if (code_size() != 0) {
1844 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
1845 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
1846 }
1847 if (method_data() != NULL) {
1848 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
1849 }
1850 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
1851 if (checked_exceptions_length() > 0) {
1852 CheckedExceptionElement* table = checked_exceptions_start();
1853 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
1854 if (Verbose) {
1855 for (int i = 0; i < checked_exceptions_length(); i++) {
1856 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
1857 }
1858 }
1859 }
1860 if (has_linenumber_table()) {
1861 u_char* table = compressed_linenumber_table();
1862 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
1863 if (Verbose) {
1864 CompressedLineNumberReadStream stream(table);
1865 while (stream.read_pair()) {
1866 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
1867 }
1868 }
1869 }
1870 st->print_cr(" - localvar length: %d", localvariable_table_length());
1871 if (localvariable_table_length() > 0) {
1872 LocalVariableTableElement* table = localvariable_table_start();
1873 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
1874 if (Verbose) {
1875 for (int i = 0; i < localvariable_table_length(); i++) {
1876 int bci = table[i].start_bci;
1877 int len = table[i].length;
1878 const char* name = constants()->printable_name_at(table[i].name_cp_index);
1879 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
1880 int slot = table[i].slot;
1881 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
1882 }
1883 }
1884 }
1885 if (code() != NULL) {
1886 st->print (" - compiled code: ");
1887 code()->print_value_on(st);
1888 }
1889 if (is_native()) {
1890 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
1891 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
1892 }
1893 }
1894
1895 #endif //PRODUCT
1896
1897 void Method::print_value_on(outputStream* st) const {
1898 assert(is_method(), "must be method");
1899 st->print_cr(internal_name());
1900 print_address_on(st);
1901 st->print(" ");
1902 name()->print_value_on(st);
1903 st->print(" ");
1904 signature()->print_value_on(st);
1905 st->print(" in ");
1906 method_holder()->print_value_on(st);
1907 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
1908 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
1909 }
1910
1911 #if INCLUDE_SERVICES
1912 // Size Statistics
1913 void Method::collect_statistics(KlassSizeStats *sz) const {
1914 int mysize = sz->count(this);
1915 sz->_method_bytes += mysize;
1916 sz->_method_all_bytes += mysize;
1917 sz->_rw_bytes += mysize;
1918
1919 if (constMethod()) {
1920 constMethod()->collect_statistics(sz);
1921 }
1922 if (method_data()) {
1923 method_data()->collect_statistics(sz);
1924 }
1925 }
1926 #endif // INCLUDE_SERVICES
1927
1928 // Verification
1929
1930 void Method::verify_on(outputStream* st) {
1931 guarantee(is_method(), "object must be method");
1932 guarantee(is_metadata(), "should be metadata");
1933 guarantee(constants()->is_constantPool(), "should be constant pool");
1934 guarantee(constants()->is_metadata(), "should be metadata");
1935 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
1936 guarantee(constMethod()->is_metadata(), "should be metadata");
1937 MethodData* md = method_data();
1938 guarantee(md == NULL ||
1939 md->is_metadata(), "should be metadata");
1940 guarantee(md == NULL ||
1941 md->is_methodData(), "should be method data");
1942 }