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 void Method::compute_size_of_parameters(Thread *thread) {
396 ArgumentSizeComputer asc(signature());
397 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
398 }
399
400 #ifdef CC_INTERP
401 void Method::set_result_index(BasicType type) {
402 _result_index = Interpreter::BasicType_as_index(type);
403 }
404 #endif
405
406 BasicType Method::result_type() const {
407 ResultTypeFinder rtf(signature());
408 return rtf.type();
409 }
410
411
412 bool Method::is_empty_method() const {
413 return code_size() == 1
414 && *code_base() == Bytecodes::_return;
415 }
416
417
418 bool Method::is_vanilla_constructor() const {
419 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
420 // which only calls the superclass vanilla constructor and possibly does stores of
421 // zero constants to local fields:
422 //
423 // aload_0
424 // invokespecial
425 // indexbyte1
426 // indexbyte2
427 //
428 // followed by an (optional) sequence of:
429 //
430 // aload_0
431 // aconst_null / iconst_0 / fconst_0 / dconst_0
432 // putfield
433 // indexbyte1
434 // indexbyte2
435 //
436 // followed by:
437 //
438 // return
439
440 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
441 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
442 int size = code_size();
443 // Check if size match
444 if (size == 0 || size % 5 != 0) return false;
445 address cb = code_base();
446 int last = size - 1;
447 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
448 // Does not call superclass default constructor
449 return false;
450 }
451 // Check optional sequence
452 for (int i = 4; i < last; i += 5) {
453 if (cb[i] != Bytecodes::_aload_0) return false;
454 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
455 if (cb[i+2] != Bytecodes::_putfield) return false;
456 }
457 return true;
458 }
459
460
461 bool Method::compute_has_loops_flag() {
462 BytecodeStream bcs(this);
463 Bytecodes::Code bc;
464
465 while ((bc = bcs.next()) >= 0) {
466 switch( bc ) {
467 case Bytecodes::_ifeq:
468 case Bytecodes::_ifnull:
469 case Bytecodes::_iflt:
470 case Bytecodes::_ifle:
471 case Bytecodes::_ifne:
472 case Bytecodes::_ifnonnull:
473 case Bytecodes::_ifgt:
474 case Bytecodes::_ifge:
475 case Bytecodes::_if_icmpeq:
476 case Bytecodes::_if_icmpne:
477 case Bytecodes::_if_icmplt:
478 case Bytecodes::_if_icmpgt:
479 case Bytecodes::_if_icmple:
480 case Bytecodes::_if_icmpge:
481 case Bytecodes::_if_acmpeq:
482 case Bytecodes::_if_acmpne:
483 case Bytecodes::_goto:
484 case Bytecodes::_jsr:
485 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
486 break;
487
488 case Bytecodes::_goto_w:
489 case Bytecodes::_jsr_w:
490 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
491 break;
492 }
493 }
494 _access_flags.set_loops_flag_init();
495 return _access_flags.has_loops();
496 }
497
498
499 bool Method::is_final_method() const {
500 // %%% Should return true for private methods also,
501 // since there is no way to override them.
502 return is_final() || method_holder()->is_final();
503 }
504
505
506 bool Method::is_strict_method() const {
507 return is_strict();
508 }
509
510
511 bool Method::can_be_statically_bound() const {
512 if (is_final_method()) return true;
513 return vtable_index() == nonvirtual_vtable_index;
514 }
515
516
517 bool Method::is_accessor() const {
518 if (code_size() != 5) return false;
519 if (size_of_parameters() != 1) return false;
520 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
521 if (java_code_at(1) != Bytecodes::_getfield) return false;
522 if (java_code_at(4) != Bytecodes::_areturn &&
523 java_code_at(4) != Bytecodes::_ireturn ) return false;
524 return true;
525 }
526
527
528 bool Method::is_initializer() const {
529 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
530 }
531
532 bool Method::has_valid_initializer_flags() const {
533 return (is_static() ||
534 method_holder()->major_version() < 51);
535 }
536
537 bool Method::is_static_initializer() const {
538 // For classfiles version 51 or greater, ensure that the clinit method is
539 // static. Non-static methods with the name "<clinit>" are not static
540 // initializers. (older classfiles exempted for backward compatibility)
541 return name() == vmSymbols::class_initializer_name() &&
542 has_valid_initializer_flags();
543 }
544
545
546 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) {
547 int length = this_oop->checked_exceptions_length();
548 if (length == 0) { // common case
549 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
550 } else {
551 methodHandle h_this(THREAD, this_oop);
552 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
553 objArrayHandle mirrors (THREAD, m_oop);
554 for (int i = 0; i < length; i++) {
555 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
556 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
557 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
558 mirrors->obj_at_put(i, k->java_mirror());
559 }
560 return mirrors;
561 }
562 };
563
564
565 int Method::line_number_from_bci(int bci) const {
566 if (bci == SynchronizationEntryBCI) bci = 0;
567 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
568 int best_bci = 0;
569 int best_line = -1;
570
571 if (has_linenumber_table()) {
572 // The line numbers are a short array of 2-tuples [start_pc, line_number].
573 // Not necessarily sorted and not necessarily one-to-one.
574 CompressedLineNumberReadStream stream(compressed_linenumber_table());
575 while (stream.read_pair()) {
576 if (stream.bci() == bci) {
577 // perfect match
578 return stream.line();
579 } else {
580 // update best_bci/line
581 if (stream.bci() < bci && stream.bci() >= best_bci) {
582 best_bci = stream.bci();
583 best_line = stream.line();
584 }
585 }
586 }
587 }
588 return best_line;
589 }
590
591
592 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
593 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
594 Thread *thread = Thread::current();
595 Symbol* klass_name = constants()->klass_name_at(klass_index);
596 Handle loader(thread, method_holder()->class_loader());
597 Handle prot (thread, method_holder()->protection_domain());
598 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
599 } else {
600 return true;
601 }
602 }
603
604
605 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
606 int klass_index = constants()->klass_ref_index_at(refinfo_index);
607 if (must_be_resolved) {
608 // Make sure klass is resolved in constantpool.
609 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
610 }
611 return is_klass_loaded_by_klass_index(klass_index);
612 }
613
614
615 void Method::set_native_function(address function, bool post_event_flag) {
616 assert(function != NULL, "use clear_native_function to unregister natives");
617 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
618 address* native_function = native_function_addr();
619
620 // We can see racers trying to place the same native function into place. Once
621 // is plenty.
622 address current = *native_function;
623 if (current == function) return;
624 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
625 function != NULL) {
626 // native_method_throw_unsatisfied_link_error_entry() should only
627 // be passed when post_event_flag is false.
628 assert(function !=
629 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
630 "post_event_flag mis-match");
631
632 // post the bind event, and possible change the bind function
633 JvmtiExport::post_native_method_bind(this, &function);
634 }
635 *native_function = function;
636 // This function can be called more than once. We must make sure that we always
637 // use the latest registered method -> check if a stub already has been generated.
638 // If so, we have to make it not_entrant.
639 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
640 if (nm != NULL) {
641 nm->make_not_entrant();
642 }
643 }
644
645
646 bool Method::has_native_function() const {
647 if (is_method_handle_intrinsic())
648 return false; // special-cased in SharedRuntime::generate_native_wrapper
649 address func = native_function();
650 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
651 }
652
653
654 void Method::clear_native_function() {
655 // Note: is_method_handle_intrinsic() is allowed here.
656 set_native_function(
657 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
658 !native_bind_event_is_interesting);
659 clear_code();
660 }
661
662 address Method::critical_native_function() {
663 methodHandle mh(this);
664 return NativeLookup::lookup_critical_entry(mh);
665 }
666
667
668 void Method::set_signature_handler(address handler) {
669 address* signature_handler = signature_handler_addr();
670 *signature_handler = handler;
671 }
672
673
674 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
675 if (PrintCompilation && report) {
676 ttyLocker ttyl;
677 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
678 if (comp_level == CompLevel_all) {
679 tty->print("all levels ");
680 } else {
681 tty->print("levels ");
682 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
683 tty->print("%d ", i);
684 }
685 }
686 this->print_short_name(tty);
687 int size = this->code_size();
688 if (size > 0) {
689 tty->print(" (%d bytes)", size);
690 }
691 if (reason != NULL) {
692 tty->print(" %s", reason);
693 }
694 tty->cr();
695 }
696 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
697 ttyLocker ttyl;
698 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'",
699 is_osr ? "osr_" : "", os::current_thread_id());
700 if (reason != NULL) {
701 xtty->print(" reason=\'%s\'", reason);
702 }
703 xtty->method(this);
704 xtty->stamp();
705 xtty->end_elem();
706 }
707 }
708
709 bool Method::is_not_compilable(int comp_level) const {
710 if (number_of_breakpoints() > 0)
711 return true;
712 if (is_method_handle_intrinsic())
713 return !is_synthetic(); // the generated adapters must be compiled
714 if (comp_level == CompLevel_any)
715 return is_not_c1_compilable() || is_not_c2_compilable();
716 if (is_c1_compile(comp_level))
717 return is_not_c1_compilable();
718 if (is_c2_compile(comp_level))
719 return is_not_c2_compilable();
720 return false;
721 }
722
723 // call this when compiler finds that this method is not compilable
724 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
725 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
726 if (comp_level == CompLevel_all) {
727 set_not_c1_compilable();
728 set_not_c2_compilable();
729 } else {
730 if (is_c1_compile(comp_level))
731 set_not_c1_compilable();
732 if (is_c2_compile(comp_level))
733 set_not_c2_compilable();
734 }
735 CompilationPolicy::policy()->disable_compilation(this);
736 }
737
738 bool Method::is_not_osr_compilable(int comp_level) const {
739 if (is_not_compilable(comp_level))
740 return true;
741 if (comp_level == CompLevel_any)
742 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
743 if (is_c1_compile(comp_level))
744 return is_not_c1_osr_compilable();
745 if (is_c2_compile(comp_level))
746 return is_not_c2_osr_compilable();
747 return false;
748 }
749
750 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
751 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
752 if (comp_level == CompLevel_all) {
753 set_not_c1_osr_compilable();
754 set_not_c2_osr_compilable();
755 } else {
756 if (is_c1_compile(comp_level))
757 set_not_c1_osr_compilable();
758 if (is_c2_compile(comp_level))
759 set_not_c2_osr_compilable();
760 }
761 CompilationPolicy::policy()->disable_compilation(this);
762 }
763
764 // Revert to using the interpreter and clear out the nmethod
765 void Method::clear_code() {
766
767 // this may be NULL if c2i adapters have not been made yet
768 // Only should happen at allocate time.
769 if (_adapter == NULL) {
770 _from_compiled_entry = NULL;
771 } else {
772 _from_compiled_entry = _adapter->get_c2i_entry();
773 }
774 OrderAccess::storestore();
775 _from_interpreted_entry = _i2i_entry;
776 OrderAccess::storestore();
777 _code = NULL;
778 }
779
780 // Called by class data sharing to remove any entry points (which are not shared)
781 void Method::unlink_method() {
782 _code = NULL;
783 _i2i_entry = NULL;
784 _from_interpreted_entry = NULL;
785 if (is_native()) {
786 *native_function_addr() = NULL;
787 set_signature_handler(NULL);
788 }
789 NOT_PRODUCT(set_compiled_invocation_count(0);)
790 invocation_counter()->reset();
791 backedge_counter()->reset();
792 _adapter = NULL;
793 _from_compiled_entry = NULL;
794
795 // In case of DumpSharedSpaces, _method_data should always be NULL.
796 //
797 // During runtime (!DumpSharedSpaces), when we are cleaning a
798 // shared class that failed to load, this->link_method() may
799 // have already been called (before an exception happened), so
800 // this->_method_data may not be NULL.
801 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?");
802
803 set_method_data(NULL);
804 set_interpreter_throwout_count(0);
805 set_interpreter_invocation_count(0);
806 }
807
808 // Called when the method_holder is getting linked. Setup entrypoints so the method
809 // is ready to be called from interpreter, compiler, and vtables.
810 void Method::link_method(methodHandle h_method, TRAPS) {
811 // If the code cache is full, we may reenter this function for the
812 // leftover methods that weren't linked.
813 if (_i2i_entry != NULL) return;
814
815 assert(_adapter == NULL, "init'd to NULL" );
816 assert( _code == NULL, "nothing compiled yet" );
817
818 // Setup interpreter entrypoint
819 assert(this == h_method(), "wrong h_method()" );
820 address entry = Interpreter::entry_for_method(h_method);
821 assert(entry != NULL, "interpreter entry must be non-null");
822 // Sets both _i2i_entry and _from_interpreted_entry
823 set_interpreter_entry(entry);
824 if (is_native() && !is_method_handle_intrinsic()) {
825 set_native_function(
826 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
827 !native_bind_event_is_interesting);
828 }
829
830 // Setup compiler entrypoint. This is made eagerly, so we do not need
831 // special handling of vtables. An alternative is to make adapters more
832 // lazily by calling make_adapter() from from_compiled_entry() for the
833 // normal calls. For vtable calls life gets more complicated. When a
834 // call-site goes mega-morphic we need adapters in all methods which can be
835 // called from the vtable. We need adapters on such methods that get loaded
836 // later. Ditto for mega-morphic itable calls. If this proves to be a
837 // problem we'll make these lazily later.
838 (void) make_adapters(h_method, CHECK);
839
840 // ONLY USE the h_method now as make_adapter may have blocked
841
842 }
843
844 address Method::make_adapters(methodHandle mh, TRAPS) {
845 // Adapters for compiled code are made eagerly here. They are fairly
846 // small (generally < 100 bytes) and quick to make (and cached and shared)
847 // so making them eagerly shouldn't be too expensive.
848 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
849 if (adapter == NULL ) {
850 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
851 }
852
853 mh->set_adapter_entry(adapter);
854 mh->_from_compiled_entry = adapter->get_c2i_entry();
855 return adapter->get_c2i_entry();
856 }
857
858 // The verified_code_entry() must be called when a invoke is resolved
859 // on this method.
860
861 // It returns the compiled code entry point, after asserting not null.
862 // This function is called after potential safepoints so that nmethod
863 // or adapter that it points to is still live and valid.
864 // This function must not hit a safepoint!
865 address Method::verified_code_entry() {
866 debug_only(No_Safepoint_Verifier nsv;)
867 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
868 if (code == NULL && UseCodeCacheFlushing) {
869 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this);
870 if (saved_code != NULL) {
871 methodHandle method(this);
872 assert( ! saved_code->is_osr_method(), "should not get here for osr" );
873 set_code( method, saved_code );
874 }
875 }
876
877 assert(_from_compiled_entry != NULL, "must be set");
878 return _from_compiled_entry;
879 }
880
881 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
882 // (could be racing a deopt).
883 // Not inline to avoid circular ref.
884 bool Method::check_code() const {
885 // cached in a register or local. There's a race on the value of the field.
886 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
887 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
888 }
889
890 // Install compiled code. Instantly it can execute.
891 void Method::set_code(methodHandle mh, nmethod *code) {
892 assert( code, "use clear_code to remove code" );
893 assert( mh->check_code(), "" );
894
895 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
896
897 // These writes must happen in this order, because the interpreter will
898 // directly jump to from_interpreted_entry which jumps to an i2c adapter
899 // which jumps to _from_compiled_entry.
900 mh->_code = code; // Assign before allowing compiled code to exec
901
902 int comp_level = code->comp_level();
903 // In theory there could be a race here. In practice it is unlikely
904 // and not worth worrying about.
905 if (comp_level > mh->highest_comp_level()) {
906 mh->set_highest_comp_level(comp_level);
907 }
908
909 OrderAccess::storestore();
910 #ifdef SHARK
911 mh->_from_interpreted_entry = code->insts_begin();
912 #else //!SHARK
913 mh->_from_compiled_entry = code->verified_entry_point();
914 OrderAccess::storestore();
915 // Instantly compiled code can execute.
916 if (!mh->is_method_handle_intrinsic())
917 mh->_from_interpreted_entry = mh->get_i2c_entry();
918 #endif //!SHARK
919 }
920
921
922 bool Method::is_overridden_in(Klass* k) const {
923 InstanceKlass* ik = InstanceKlass::cast(k);
924
925 if (ik->is_interface()) return false;
926
927 // If method is an interface, we skip it - except if it
928 // is a miranda method
929 if (method_holder()->is_interface()) {
930 // Check that method is not a miranda method
931 if (ik->lookup_method(name(), signature()) == NULL) {
932 // No implementation exist - so miranda method
933 return false;
934 }
935 return true;
936 }
937
938 assert(ik->is_subclass_of(method_holder()), "should be subklass");
939 assert(ik->vtable() != NULL, "vtable should exist");
940 if (vtable_index() == nonvirtual_vtable_index) {
941 return false;
942 } else {
943 Method* vt_m = ik->method_at_vtable(vtable_index());
944 return vt_m != this;
945 }
946 }
947
948
949 // give advice about whether this Method* should be cached or not
950 bool Method::should_not_be_cached() const {
951 if (is_old()) {
952 // This method has been redefined. It is either EMCP or obsolete
953 // and we don't want to cache it because that would pin the method
954 // down and prevent it from being collectible if and when it
955 // finishes executing.
956 return true;
957 }
958
959 // caching this method should be just fine
960 return false;
961 }
962
963
964 /**
965 * Returns true if this is one of the specially treated methods for
966 * security related stack walks (like Reflection.getCallerClass).
967 */
968 bool Method::is_ignored_by_security_stack_walk() const {
969 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection;
970
971 assert(intrinsic_id() != vmIntrinsics::_invoke || Universe::reflect_invoke_cache()->is_same_method((Method*)this), "sanity");
972 if (intrinsic_id() == vmIntrinsics::_invoke) {
973 // This is Method.invoke() -- ignore it
974 return true;
975 }
976 if (use_new_reflection &&
977 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
978 // This is an auxilary frame -- ignore it
979 return true;
980 }
981 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
982 // This is an internal adapter frame for method handles -- ignore it
983 return true;
984 }
985 return false;
986 }
987
988
989 // Constant pool structure for invoke methods:
990 enum {
991 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
992 _imcp_invoke_signature, // utf8: (variable Symbol*)
993 _imcp_limit
994 };
995
996 // Test if this method is an MH adapter frame generated by Java code.
997 // Cf. java/lang/invoke/InvokerBytecodeGenerator
998 bool Method::is_compiled_lambda_form() const {
999 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1000 }
1001
1002 // Test if this method is an internal MH primitive method.
1003 bool Method::is_method_handle_intrinsic() const {
1004 vmIntrinsics::ID iid = intrinsic_id();
1005 return (MethodHandles::is_signature_polymorphic(iid) &&
1006 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1007 }
1008
1009 bool Method::has_member_arg() const {
1010 vmIntrinsics::ID iid = intrinsic_id();
1011 return (MethodHandles::is_signature_polymorphic(iid) &&
1012 MethodHandles::has_member_arg(iid));
1013 }
1014
1015 // Make an instance of a signature-polymorphic internal MH primitive.
1016 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1017 Symbol* signature,
1018 TRAPS) {
1019 ResourceMark rm;
1020 methodHandle empty;
1021
1022 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1023 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1024 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1025 if (TraceMethodHandles) {
1026 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1027 }
1028
1029 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1030 name->increment_refcount();
1031 signature->increment_refcount();
1032
1033 int cp_length = _imcp_limit;
1034 ClassLoaderData* loader_data = holder->class_loader_data();
1035 constantPoolHandle cp;
1036 {
1037 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1038 cp = constantPoolHandle(THREAD, cp_oop);
1039 }
1040 cp->set_pool_holder(InstanceKlass::cast(holder()));
1041 cp->symbol_at_put(_imcp_invoke_name, name);
1042 cp->symbol_at_put(_imcp_invoke_signature, signature);
1043 cp->set_has_preresolution();
1044
1045 // decide on access bits: public or not?
1046 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1047 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1048 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1049 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1050
1051 methodHandle m;
1052 {
1053 InlineTableSizes sizes;
1054 Method* m_oop = Method::allocate(loader_data, 0,
1055 accessFlags_from(flags_bits), &sizes,
1056 ConstMethod::NORMAL, CHECK_(empty));
1057 m = methodHandle(THREAD, m_oop);
1058 }
1059 m->set_constants(cp());
1060 m->set_name_index(_imcp_invoke_name);
1061 m->set_signature_index(_imcp_invoke_signature);
1062 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1063 assert(m->signature() == signature, "");
1064 #ifdef CC_INTERP
1065 ResultTypeFinder rtf(signature);
1066 m->set_result_index(rtf.type());
1067 #endif
1068 m->compute_size_of_parameters(THREAD);
1069 m->init_intrinsic_id();
1070 assert(m->is_method_handle_intrinsic(), "");
1071 #ifdef ASSERT
1072 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1073 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1074 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1075 #endif //ASSERT
1076
1077 // Finally, set up its entry points.
1078 assert(m->can_be_statically_bound(), "");
1079 m->set_vtable_index(Method::nonvirtual_vtable_index);
1080 m->link_method(m, CHECK_(empty));
1081
1082 if (TraceMethodHandles && (Verbose || WizardMode))
1083 m->print_on(tty);
1084
1085 return m;
1086 }
1087
1088 Klass* Method::check_non_bcp_klass(Klass* klass) {
1089 if (klass != NULL && klass->class_loader() != NULL) {
1090 if (klass->oop_is_objArray())
1091 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1092 return klass;
1093 }
1094 return NULL;
1095 }
1096
1097
1098 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1099 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1100 // Code below does not work for native methods - they should never get rewritten anyway
1101 assert(!m->is_native(), "cannot rewrite native methods");
1102 // Allocate new Method*
1103 AccessFlags flags = m->access_flags();
1104
1105 ConstMethod* cm = m->constMethod();
1106 int checked_exceptions_len = cm->checked_exceptions_length();
1107 int localvariable_len = cm->localvariable_table_length();
1108 int exception_table_len = cm->exception_table_length();
1109 int method_parameters_len = cm->method_parameters_length();
1110 int method_annotations_len = cm->method_annotations_length();
1111 int parameter_annotations_len = cm->parameter_annotations_length();
1112 int type_annotations_len = cm->type_annotations_length();
1113 int default_annotations_len = cm->default_annotations_length();
1114
1115 InlineTableSizes sizes(
1116 localvariable_len,
1117 new_compressed_linenumber_size,
1118 exception_table_len,
1119 checked_exceptions_len,
1120 method_parameters_len,
1121 cm->generic_signature_index(),
1122 method_annotations_len,
1123 parameter_annotations_len,
1124 type_annotations_len,
1125 default_annotations_len,
1126 0);
1127
1128 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1129 Method* newm_oop = Method::allocate(loader_data,
1130 new_code_length,
1131 flags,
1132 &sizes,
1133 m->method_type(),
1134 CHECK_(methodHandle()));
1135 methodHandle newm (THREAD, newm_oop);
1136 int new_method_size = newm->method_size();
1137
1138 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1139 ConstMethod* newcm = newm->constMethod();
1140 int new_const_method_size = newm->constMethod()->size();
1141
1142 memcpy(newm(), m(), sizeof(Method));
1143
1144 // Create shallow copy of ConstMethod.
1145 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1146
1147 // Reset correct method/const method, method size, and parameter info
1148 newm->set_constMethod(newcm);
1149 newm->constMethod()->set_code_size(new_code_length);
1150 newm->constMethod()->set_constMethod_size(new_const_method_size);
1151 newm->set_method_size(new_method_size);
1152 assert(newm->code_size() == new_code_length, "check");
1153 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1154 assert(newm->exception_table_length() == exception_table_len, "check");
1155 assert(newm->localvariable_table_length() == localvariable_len, "check");
1156 // Copy new byte codes
1157 memcpy(newm->code_base(), new_code, new_code_length);
1158 // Copy line number table
1159 if (new_compressed_linenumber_size > 0) {
1160 memcpy(newm->compressed_linenumber_table(),
1161 new_compressed_linenumber_table,
1162 new_compressed_linenumber_size);
1163 }
1164 // Copy checked_exceptions
1165 if (checked_exceptions_len > 0) {
1166 memcpy(newm->checked_exceptions_start(),
1167 m->checked_exceptions_start(),
1168 checked_exceptions_len * sizeof(CheckedExceptionElement));
1169 }
1170 // Copy exception table
1171 if (exception_table_len > 0) {
1172 memcpy(newm->exception_table_start(),
1173 m->exception_table_start(),
1174 exception_table_len * sizeof(ExceptionTableElement));
1175 }
1176 // Copy local variable number table
1177 if (localvariable_len > 0) {
1178 memcpy(newm->localvariable_table_start(),
1179 m->localvariable_table_start(),
1180 localvariable_len * sizeof(LocalVariableTableElement));
1181 }
1182 // Copy stackmap table
1183 if (m->has_stackmap_table()) {
1184 int code_attribute_length = m->stackmap_data()->length();
1185 Array<u1>* stackmap_data =
1186 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1187 memcpy((void*)stackmap_data->adr_at(0),
1188 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1189 newm->set_stackmap_data(stackmap_data);
1190 }
1191
1192 return newm;
1193 }
1194
1195 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1196 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1197 // because we are not loading from core libraries
1198 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1199 // which does not use the class default class loader so we check for its loader here
1200 InstanceKlass* ik = InstanceKlass::cast(holder);
1201 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) {
1202 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1203 }
1204
1205 // see if the klass name is well-known:
1206 Symbol* klass_name = ik->name();
1207 return vmSymbols::find_sid(klass_name);
1208 }
1209
1210 void Method::init_intrinsic_id() {
1211 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1212 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1213 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1214 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1215
1216 // the klass name is well-known:
1217 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1218 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1219
1220 // ditto for method and signature:
1221 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1222 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1223 && name_id == vmSymbols::NO_SID)
1224 return;
1225 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1226 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1227 && sig_id == vmSymbols::NO_SID) return;
1228 jshort flags = access_flags().as_short();
1229
1230 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1231 if (id != vmIntrinsics::_none) {
1232 set_intrinsic_id(id);
1233 return;
1234 }
1235
1236 // A few slightly irregular cases:
1237 switch (klass_id) {
1238 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1239 // Second chance: check in regular Math.
1240 switch (name_id) {
1241 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1242 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1243 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1244 // pretend it is the corresponding method in the non-strict class:
1245 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1246 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1247 break;
1248 }
1249 break;
1250
1251 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1252 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1253 if (!is_native()) break;
1254 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1255 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1256 id = vmIntrinsics::_none;
1257 break;
1258 }
1259
1260 if (id != vmIntrinsics::_none) {
1261 // Set up its iid. It is an alias method.
1262 set_intrinsic_id(id);
1263 return;
1264 }
1265 }
1266
1267 // These two methods are static since a GC may move the Method
1268 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1269 if (THREAD->is_Compiler_thread()) {
1270 // There is nothing useful this routine can do from within the Compile thread.
1271 // Hopefully, the signature contains only well-known classes.
1272 // We could scan for this and return true/false, but the caller won't care.
1273 return false;
1274 }
1275 bool sig_is_loaded = true;
1276 Handle class_loader(THREAD, m->method_holder()->class_loader());
1277 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1278 ResourceMark rm(THREAD);
1279 Symbol* signature = m->signature();
1280 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1281 if (ss.is_object()) {
1282 Symbol* sym = ss.as_symbol(CHECK_(false));
1283 Symbol* name = sym;
1284 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1285 protection_domain, THREAD);
1286 // We are loading classes eagerly. If a ClassNotFoundException or
1287 // a LinkageError was generated, be sure to ignore it.
1288 if (HAS_PENDING_EXCEPTION) {
1289 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1290 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1291 CLEAR_PENDING_EXCEPTION;
1292 } else {
1293 return false;
1294 }
1295 }
1296 if( klass == NULL) { sig_is_loaded = false; }
1297 }
1298 }
1299 return sig_is_loaded;
1300 }
1301
1302 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1303 Handle class_loader(THREAD, m->method_holder()->class_loader());
1304 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1305 ResourceMark rm(THREAD);
1306 Symbol* signature = m->signature();
1307 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1308 if (ss.type() == T_OBJECT) {
1309 Symbol* name = ss.as_symbol_or_null();
1310 if (name == NULL) return true;
1311 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1312 if (klass == NULL) return true;
1313 }
1314 }
1315 return false;
1316 }
1317
1318 // Exposed so field engineers can debug VM
1319 void Method::print_short_name(outputStream* st) {
1320 ResourceMark rm;
1321 #ifdef PRODUCT
1322 st->print(" %s::", method_holder()->external_name());
1323 #else
1324 st->print(" %s::", method_holder()->internal_name());
1325 #endif
1326 name()->print_symbol_on(st);
1327 if (WizardMode) signature()->print_symbol_on(st);
1328 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1329 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1330 }
1331
1332 // Comparer for sorting an object array containing
1333 // Method*s.
1334 static int method_comparator(Method* a, Method* b) {
1335 return a->name()->fast_compare(b->name());
1336 }
1337
1338 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1339 void Method::sort_methods(Array<Method*>* methods, bool idempotent) {
1340 int length = methods->length();
1341 if (length > 1) {
1342 {
1343 No_Safepoint_Verifier nsv;
1344 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1345 }
1346 // Reset method ordering
1347 for (int i = 0; i < length; i++) {
1348 Method* m = methods->at(i);
1349 m->set_method_idnum(i);
1350 }
1351 }
1352 }
1353
1354
1355 //-----------------------------------------------------------------------------------
1356 // Non-product code unless JVM/TI needs it
1357
1358 #if !defined(PRODUCT) || INCLUDE_JVMTI
1359 class SignatureTypePrinter : public SignatureTypeNames {
1360 private:
1361 outputStream* _st;
1362 bool _use_separator;
1363
1364 void type_name(const char* name) {
1365 if (_use_separator) _st->print(", ");
1366 _st->print(name);
1367 _use_separator = true;
1368 }
1369
1370 public:
1371 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1372 _st = st;
1373 _use_separator = false;
1374 }
1375
1376 void print_parameters() { _use_separator = false; iterate_parameters(); }
1377 void print_returntype() { _use_separator = false; iterate_returntype(); }
1378 };
1379
1380
1381 void Method::print_name(outputStream* st) {
1382 Thread *thread = Thread::current();
1383 ResourceMark rm(thread);
1384 SignatureTypePrinter sig(signature(), st);
1385 st->print("%s ", is_static() ? "static" : "virtual");
1386 sig.print_returntype();
1387 st->print(" %s.", method_holder()->internal_name());
1388 name()->print_symbol_on(st);
1389 st->print("(");
1390 sig.print_parameters();
1391 st->print(")");
1392 }
1393 #endif // !PRODUCT || INCLUDE_JVMTI
1394
1395
1396 //-----------------------------------------------------------------------------------
1397 // Non-product code
1398
1399 #ifndef PRODUCT
1400 void Method::print_codes_on(outputStream* st) const {
1401 print_codes_on(0, code_size(), st);
1402 }
1403
1404 void Method::print_codes_on(int from, int to, outputStream* st) const {
1405 Thread *thread = Thread::current();
1406 ResourceMark rm(thread);
1407 methodHandle mh (thread, (Method*)this);
1408 BytecodeStream s(mh);
1409 s.set_interval(from, to);
1410 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1411 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1412 }
1413 #endif // not PRODUCT
1414
1415
1416 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1417 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1418 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1419 // as end-of-stream terminator.
1420
1421 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1422 // bci and line number does not compress into single byte.
1423 // Write out escape character and use regular compression for bci and line number.
1424 write_byte((jubyte)0xFF);
1425 write_signed_int(bci_delta);
1426 write_signed_int(line_delta);
1427 }
1428
1429 // See comment in method.hpp which explains why this exists.
1430 #if defined(_M_AMD64) && _MSC_VER >= 1400
1431 #pragma optimize("", off)
1432 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1433 write_pair_inline(bci, line);
1434 }
1435 #pragma optimize("", on)
1436 #endif
1437
1438 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1439 _bci = 0;
1440 _line = 0;
1441 };
1442
1443
1444 bool CompressedLineNumberReadStream::read_pair() {
1445 jubyte next = read_byte();
1446 // Check for terminator
1447 if (next == 0) return false;
1448 if (next == 0xFF) {
1449 // Escape character, regular compression used
1450 _bci += read_signed_int();
1451 _line += read_signed_int();
1452 } else {
1453 // Single byte compression used
1454 _bci += next >> 3;
1455 _line += next & 0x7;
1456 }
1457 return true;
1458 }
1459
1460
1461 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1462 BreakpointInfo* bp = method_holder()->breakpoints();
1463 for (; bp != NULL; bp = bp->next()) {
1464 if (bp->match(this, bci)) {
1465 return bp->orig_bytecode();
1466 }
1467 }
1468 ShouldNotReachHere();
1469 return Bytecodes::_shouldnotreachhere;
1470 }
1471
1472 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1473 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1474 BreakpointInfo* bp = method_holder()->breakpoints();
1475 for (; bp != NULL; bp = bp->next()) {
1476 if (bp->match(this, bci)) {
1477 bp->set_orig_bytecode(code);
1478 // and continue, in case there is more than one
1479 }
1480 }
1481 }
1482
1483 void Method::set_breakpoint(int bci) {
1484 InstanceKlass* ik = method_holder();
1485 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1486 bp->set_next(ik->breakpoints());
1487 ik->set_breakpoints(bp);
1488 // do this last:
1489 bp->set(this);
1490 }
1491
1492 static void clear_matches(Method* m, int bci) {
1493 InstanceKlass* ik = m->method_holder();
1494 BreakpointInfo* prev_bp = NULL;
1495 BreakpointInfo* next_bp;
1496 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1497 next_bp = bp->next();
1498 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1499 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1500 // do this first:
1501 bp->clear(m);
1502 // unhook it
1503 if (prev_bp != NULL)
1504 prev_bp->set_next(next_bp);
1505 else
1506 ik->set_breakpoints(next_bp);
1507 delete bp;
1508 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1509 // at same location. So we have multiple matching (method_index and bci)
1510 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1511 // breakpoint for clear_breakpoint request and keep all other method versions
1512 // BreakpointInfo for future clear_breakpoint request.
1513 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1514 // which is being called when class is unloaded. We delete all the Breakpoint
1515 // information for all versions of method. We may not correctly restore the original
1516 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1517 // so these methods won't be used anymore.
1518 if (bci >= 0) {
1519 break;
1520 }
1521 } else {
1522 // This one is a keeper.
1523 prev_bp = bp;
1524 }
1525 }
1526 }
1527
1528 void Method::clear_breakpoint(int bci) {
1529 assert(bci >= 0, "");
1530 clear_matches(this, bci);
1531 }
1532
1533 void Method::clear_all_breakpoints() {
1534 clear_matches(this, -1);
1535 }
1536
1537
1538 int Method::invocation_count() {
1539 if (TieredCompilation) {
1540 MethodData* const mdo = method_data();
1541 if (invocation_counter()->carry() || ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1542 return InvocationCounter::count_limit;
1543 } else {
1544 return invocation_counter()->count() + ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1545 }
1546 } else {
1547 return invocation_counter()->count();
1548 }
1549 }
1550
1551 int Method::backedge_count() {
1552 if (TieredCompilation) {
1553 MethodData* const mdo = method_data();
1554 if (backedge_counter()->carry() || ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1555 return InvocationCounter::count_limit;
1556 } else {
1557 return backedge_counter()->count() + ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1558 }
1559 } else {
1560 return backedge_counter()->count();
1561 }
1562 }
1563
1564 int Method::highest_comp_level() const {
1565 MethodData* mdo = method_data();
1566 if (mdo != NULL) {
1567 return mdo->highest_comp_level();
1568 } else {
1569 return CompLevel_none;
1570 }
1571 }
1572
1573 int Method::highest_osr_comp_level() const {
1574 MethodData* mdo = method_data();
1575 if (mdo != NULL) {
1576 return mdo->highest_osr_comp_level();
1577 } else {
1578 return CompLevel_none;
1579 }
1580 }
1581
1582 void Method::set_highest_comp_level(int level) {
1583 MethodData* mdo = method_data();
1584 if (mdo != NULL) {
1585 mdo->set_highest_comp_level(level);
1586 }
1587 }
1588
1589 void Method::set_highest_osr_comp_level(int level) {
1590 MethodData* mdo = method_data();
1591 if (mdo != NULL) {
1592 mdo->set_highest_osr_comp_level(level);
1593 }
1594 }
1595
1596 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1597 _bci = bci;
1598 _name_index = m->name_index();
1599 _signature_index = m->signature_index();
1600 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1601 if (_orig_bytecode == Bytecodes::_breakpoint)
1602 _orig_bytecode = m->orig_bytecode_at(_bci);
1603 _next = NULL;
1604 }
1605
1606 void BreakpointInfo::set(Method* method) {
1607 #ifdef ASSERT
1608 {
1609 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1610 if (code == Bytecodes::_breakpoint)
1611 code = method->orig_bytecode_at(_bci);
1612 assert(orig_bytecode() == code, "original bytecode must be the same");
1613 }
1614 #endif
1615 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1616 method->incr_number_of_breakpoints();
1617 SystemDictionary::notice_modification();
1618 {
1619 // Deoptimize all dependents on this method
1620 Thread *thread = Thread::current();
1621 HandleMark hm(thread);
1622 methodHandle mh(thread, method);
1623 Universe::flush_dependents_on_method(mh);
1624 }
1625 }
1626
1627 void BreakpointInfo::clear(Method* method) {
1628 *method->bcp_from(_bci) = orig_bytecode();
1629 assert(method->number_of_breakpoints() > 0, "must not go negative");
1630 method->decr_number_of_breakpoints();
1631 }
1632
1633 // jmethodID handling
1634
1635 // This is a block allocating object, sort of like JNIHandleBlock, only a
1636 // lot simpler. There aren't many of these, they aren't long, they are rarely
1637 // deleted and so we can do some suboptimal things.
1638 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1639 // never get rid of it.
1640 // It would be nice to be able to parameterize the number of methods for
1641 // the null_class_loader but then we'd have to turn this and ClassLoaderData
1642 // into templates.
1643
1644 // I feel like this brain dead class should exist somewhere in the STL
1645
1646 class JNIMethodBlock : public CHeapObj<mtClass> {
1647 enum { number_of_methods = 8 };
1648
1649 Method* _methods[number_of_methods];
1650 int _top;
1651 JNIMethodBlock* _next;
1652 public:
1653 static Method* const _free_method;
1654
1655 JNIMethodBlock() : _next(NULL), _top(0) {
1656 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method;
1657 }
1658
1659 Method** add_method(Method* m) {
1660 if (_top < number_of_methods) {
1661 // top points to the next free entry.
1662 int i = _top;
1663 _methods[i] = m;
1664 _top++;
1665 return &_methods[i];
1666 } else if (_top == number_of_methods) {
1667 // if the next free entry ran off the block see if there's a free entry
1668 for (int i = 0; i< number_of_methods; i++) {
1669 if (_methods[i] == _free_method) {
1670 _methods[i] = m;
1671 return &_methods[i];
1672 }
1673 }
1674 // Only check each block once for frees. They're very unlikely.
1675 // Increment top past the end of the block.
1676 _top++;
1677 }
1678 // need to allocate a next block.
1679 if (_next == NULL) {
1680 _next = new JNIMethodBlock();
1681 }
1682 return _next->add_method(m);
1683 }
1684
1685 bool contains(Method** m) {
1686 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1687 for (int i = 0; i< number_of_methods; i++) {
1688 if (&(b->_methods[i]) == m) {
1689 return true;
1690 }
1691 }
1692 }
1693 return false; // not found
1694 }
1695
1696 // Doesn't really destroy it, just marks it as free so it can be reused.
1697 void destroy_method(Method** m) {
1698 #ifdef ASSERT
1699 assert(contains(m), "should be a methodID");
1700 #endif // ASSERT
1701 *m = _free_method;
1702 }
1703
1704 // During class unloading the methods are cleared, which is different
1705 // than freed.
1706 void clear_all_methods() {
1707 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1708 for (int i = 0; i< number_of_methods; i++) {
1709 _methods[i] = NULL;
1710 }
1711 }
1712 }
1713 #ifndef PRODUCT
1714 int count_methods() {
1715 // count all allocated methods
1716 int count = 0;
1717 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1718 for (int i = 0; i< number_of_methods; i++) {
1719 if (_methods[i] != _free_method) count++;
1720 }
1721 }
1722 return count;
1723 }
1724 #endif // PRODUCT
1725 };
1726
1727 // Something that can't be mistaken for an address or a markOop
1728 Method* const JNIMethodBlock::_free_method = (Method*)55;
1729
1730 // Add a method id to the jmethod_ids
1731 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
1732 ClassLoaderData* cld = loader_data;
1733
1734 if (!SafepointSynchronize::is_at_safepoint()) {
1735 // Have to add jmethod_ids() to class loader data thread-safely.
1736 // Also have to add the method to the list safely, which the cld lock
1737 // protects as well.
1738 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1739 if (cld->jmethod_ids() == NULL) {
1740 cld->set_jmethod_ids(new JNIMethodBlock());
1741 }
1742 // jmethodID is a pointer to Method*
1743 return (jmethodID)cld->jmethod_ids()->add_method(m);
1744 } else {
1745 // At safepoint, we are single threaded and can set this.
1746 if (cld->jmethod_ids() == NULL) {
1747 cld->set_jmethod_ids(new JNIMethodBlock());
1748 }
1749 // jmethodID is a pointer to Method*
1750 return (jmethodID)cld->jmethod_ids()->add_method(m);
1751 }
1752 }
1753
1754 // Mark a jmethodID as free. This is called when there is a data race in
1755 // InstanceKlass while creating the jmethodID cache.
1756 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
1757 ClassLoaderData* cld = loader_data;
1758 Method** ptr = (Method**)m;
1759 assert(cld->jmethod_ids() != NULL, "should have method handles");
1760 cld->jmethod_ids()->destroy_method(ptr);
1761 }
1762
1763 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
1764 // Can't assert the method_holder is the same because the new method has the
1765 // scratch method holder.
1766 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
1767 == new_method->method_holder()->class_loader(),
1768 "changing to a different class loader");
1769 // Just change the method in place, jmethodID pointer doesn't change.
1770 *((Method**)jmid) = new_method;
1771 }
1772
1773 bool Method::is_method_id(jmethodID mid) {
1774 Method* m = resolve_jmethod_id(mid);
1775 assert(m != NULL, "should be called with non-null method");
1776 InstanceKlass* ik = m->method_holder();
1777 ClassLoaderData* cld = ik->class_loader_data();
1778 if (cld->jmethod_ids() == NULL) return false;
1779 return (cld->jmethod_ids()->contains((Method**)mid));
1780 }
1781
1782 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
1783 if (mid == NULL) return NULL;
1784 Method* o = resolve_jmethod_id(mid);
1785 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
1786 return NULL;
1787 }
1788 return o;
1789 };
1790
1791 void Method::set_on_stack(const bool value) {
1792 // Set both the method itself and its constant pool. The constant pool
1793 // on stack means some method referring to it is also on the stack.
1794 _access_flags.set_on_stack(value);
1795 constants()->set_on_stack(value);
1796 if (value) MetadataOnStackMark::record(this);
1797 }
1798
1799 // Called when the class loader is unloaded to make all methods weak.
1800 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1801 loader_data->jmethod_ids()->clear_all_methods();
1802 }
1803
1804
1805 // Check that this pointer is valid by checking that the vtbl pointer matches
1806 bool Method::is_valid_method() const {
1807 if (this == NULL) {
1808 return false;
1809 } else if (!is_metaspace_object()) {
1810 return false;
1811 } else {
1812 Method m;
1813 // This assumes that the vtbl pointer is the first word of a C++ object.
1814 // This assumption is also in universe.cpp patch_klass_vtble
1815 void* vtbl2 = dereference_vptr((void*)&m);
1816 void* this_vtbl = dereference_vptr((void*)this);
1817 return vtbl2 == this_vtbl;
1818 }
1819 }
1820
1821 #ifndef PRODUCT
1822 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1823 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1824 }
1825 #endif // PRODUCT
1826
1827
1828 // Printing
1829
1830 #ifndef PRODUCT
1831
1832 void Method::print_on(outputStream* st) const {
1833 ResourceMark rm;
1834 assert(is_method(), "must be method");
1835 st->print_cr(internal_name());
1836 // get the effect of PrintOopAddress, always, for methods:
1837 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this);
1838 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
1839 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants());
1840 constants()->print_value_on(st); st->cr();
1841 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
1842 st->print (" - name: "); name()->print_value_on(st); st->cr();
1843 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
1844 st->print_cr(" - max stack: %d", max_stack());
1845 st->print_cr(" - max locals: %d", max_locals());
1846 st->print_cr(" - size of params: %d", size_of_parameters());
1847 st->print_cr(" - method size: %d", method_size());
1848 if (intrinsic_id() != vmIntrinsics::_none)
1849 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
1850 if (highest_comp_level() != CompLevel_none)
1851 st->print_cr(" - highest level: %d", highest_comp_level());
1852 st->print_cr(" - vtable index: %d", _vtable_index);
1853 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
1854 st->print( " - adapters: ");
1855 AdapterHandlerEntry* a = ((Method*)this)->adapter();
1856 if (a == NULL)
1857 st->print_cr(INTPTR_FORMAT, a);
1858 else
1859 a->print_adapter_on(st);
1860 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
1861 st->print_cr(" - code size: %d", code_size());
1862 if (code_size() != 0) {
1863 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
1864 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
1865 }
1866 if (method_data() != NULL) {
1867 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
1868 }
1869 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
1870 if (checked_exceptions_length() > 0) {
1871 CheckedExceptionElement* table = checked_exceptions_start();
1872 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
1873 if (Verbose) {
1874 for (int i = 0; i < checked_exceptions_length(); i++) {
1875 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
1876 }
1877 }
1878 }
1879 if (has_linenumber_table()) {
1880 u_char* table = compressed_linenumber_table();
1881 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
1882 if (Verbose) {
1883 CompressedLineNumberReadStream stream(table);
1884 while (stream.read_pair()) {
1885 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
1886 }
1887 }
1888 }
1889 st->print_cr(" - localvar length: %d", localvariable_table_length());
1890 if (localvariable_table_length() > 0) {
1891 LocalVariableTableElement* table = localvariable_table_start();
1892 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
1893 if (Verbose) {
1894 for (int i = 0; i < localvariable_table_length(); i++) {
1895 int bci = table[i].start_bci;
1896 int len = table[i].length;
1897 const char* name = constants()->printable_name_at(table[i].name_cp_index);
1898 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
1899 int slot = table[i].slot;
1900 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
1901 }
1902 }
1903 }
1904 if (code() != NULL) {
1905 st->print (" - compiled code: ");
1906 code()->print_value_on(st);
1907 }
1908 if (is_native()) {
1909 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
1910 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
1911 }
1912 }
1913
1914 #endif //PRODUCT
1915
1916 void Method::print_value_on(outputStream* st) const {
1917 assert(is_method(), "must be method");
1918 st->print_cr(internal_name());
1919 print_address_on(st);
1920 st->print(" ");
1921 name()->print_value_on(st);
1922 st->print(" ");
1923 signature()->print_value_on(st);
1924 st->print(" in ");
1925 method_holder()->print_value_on(st);
1926 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
1927 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
1928 }
1929
1930 #if INCLUDE_SERVICES
1931 // Size Statistics
1932 void Method::collect_statistics(KlassSizeStats *sz) const {
1933 int mysize = sz->count(this);
1934 sz->_method_bytes += mysize;
1935 sz->_method_all_bytes += mysize;
1936 sz->_rw_bytes += mysize;
1937
1938 if (constMethod()) {
1939 constMethod()->collect_statistics(sz);
1940 }
1941 if (method_data()) {
1942 method_data()->collect_statistics(sz);
1943 }
1944 }
1945 #endif // INCLUDE_SERVICES
1946
1947 // Verification
1948
1949 void Method::verify_on(outputStream* st) {
1950 guarantee(is_method(), "object must be method");
1951 guarantee(is_metadata(), "should be metadata");
1952 guarantee(constants()->is_constantPool(), "should be constant pool");
1953 guarantee(constants()->is_metadata(), "should be metadata");
1954 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
1955 guarantee(constMethod()->is_metadata(), "should be metadata");
1956 MethodData* md = method_data();
1957 guarantee(md == NULL ||
1958 md->is_metadata(), "should be metadata");
1959 guarantee(md == NULL ||
1960 md->is_methodData(), "should be method data");
1961 }