1 /*
2 * Copyright (c) 1997, 2014, 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/orderAccess.inline.hpp"
53 #include "runtime/relocator.hpp"
54 #include "runtime/sharedRuntime.hpp"
55 #include "runtime/signature.hpp"
56 #include "utilities/quickSort.hpp"
57 #include "utilities/xmlstream.hpp"
58
59 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
60
61 // Implementation of Method
62
63 Method* Method::allocate(ClassLoaderData* loader_data,
64 int byte_code_size,
65 AccessFlags access_flags,
66 InlineTableSizes* sizes,
67 ConstMethod::MethodType method_type,
68 TRAPS) {
69 assert(!access_flags.is_native() || byte_code_size == 0,
70 "native methods should not contain byte codes");
71 ConstMethod* cm = ConstMethod::allocate(loader_data,
72 byte_code_size,
73 sizes,
74 method_type,
75 CHECK_NULL);
76
77 int size = Method::size(access_flags.is_native());
78
79 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, size);
80 }
81
82 Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) {
83 No_Safepoint_Verifier no_safepoint;
84 set_constMethod(xconst);
85 set_access_flags(access_flags);
86 set_method_size(size);
87 #ifdef CC_INTERP
88 set_result_index(T_VOID);
89 #endif
90 set_intrinsic_id(vmIntrinsics::_none);
91 set_jfr_towrite(false);
92 set_force_inline(false);
93 set_hidden(false);
94 set_dont_inline(false);
95 set_method_data(NULL);
96 clear_method_counters();
97 set_vtable_index(Method::garbage_vtable_index);
98
99 // Fix and bury in Method*
100 set_interpreter_entry(NULL); // sets i2i entry and from_int
101 set_adapter_entry(NULL);
102 clear_code(); // from_c/from_i get set to c2i/i2i
103
104 if (access_flags.is_native()) {
105 clear_native_function();
106 set_signature_handler(NULL);
107 }
108
109 NOT_PRODUCT(set_compiled_invocation_count(0);)
110 }
111
112 // Release Method*. The nmethod will be gone when we get here because
113 // we've walked the code cache.
114 void Method::deallocate_contents(ClassLoaderData* loader_data) {
115 MetadataFactory::free_metadata(loader_data, constMethod());
116 set_constMethod(NULL);
117 MetadataFactory::free_metadata(loader_data, method_data());
118 set_method_data(NULL);
119 MetadataFactory::free_metadata(loader_data, method_counters());
120 clear_method_counters();
121 // The nmethod will be gone when we get here.
122 if (code() != NULL) _code = NULL;
123 }
124
125 address Method::get_i2c_entry() {
126 assert(_adapter != NULL, "must have");
127 return _adapter->get_i2c_entry();
128 }
129
130 address Method::get_c2i_entry() {
131 assert(_adapter != NULL, "must have");
132 return _adapter->get_c2i_entry();
133 }
134
135 address Method::get_c2i_unverified_entry() {
136 assert(_adapter != NULL, "must have");
137 return _adapter->get_c2i_unverified_entry();
138 }
139
140 char* Method::name_and_sig_as_C_string() const {
141 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
142 }
143
144 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
145 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
146 }
147
148 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
149 const char* klass_name = klass->external_name();
150 int klass_name_len = (int)strlen(klass_name);
151 int method_name_len = method_name->utf8_length();
152 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
153 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
154 strcpy(dest, klass_name);
155 dest[klass_name_len] = '.';
156 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
157 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
158 dest[len] = 0;
159 return dest;
160 }
161
162 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
163 Symbol* klass_name = klass->name();
164 klass_name->as_klass_external_name(buf, size);
165 int len = (int)strlen(buf);
166
167 if (len < size - 1) {
168 buf[len++] = '.';
169
170 method_name->as_C_string(&(buf[len]), size - len);
171 len = (int)strlen(buf);
172
173 signature->as_C_string(&(buf[len]), size - len);
174 }
175
176 return buf;
177 }
178
179 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) {
180 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
181 // access exception table
182 ExceptionTable table(mh());
183 int length = table.length();
184 // iterate through all entries sequentially
185 constantPoolHandle pool(THREAD, mh->constants());
186 for (int i = 0; i < length; i ++) {
187 //reacquire the table in case a GC happened
188 ExceptionTable table(mh());
189 int beg_bci = table.start_pc(i);
190 int end_bci = table.end_pc(i);
191 assert(beg_bci <= end_bci, "inconsistent exception table");
192 if (beg_bci <= throw_bci && throw_bci < end_bci) {
193 // exception handler bci range covers throw_bci => investigate further
194 int handler_bci = table.handler_pc(i);
195 int klass_index = table.catch_type_index(i);
196 if (klass_index == 0) {
197 return handler_bci;
198 } else if (ex_klass.is_null()) {
199 return handler_bci;
200 } else {
201 // we know the exception class => get the constraint class
202 // this may require loading of the constraint class; if verification
203 // fails or some other exception occurs, return handler_bci
204 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
205 KlassHandle klass = KlassHandle(THREAD, k);
206 assert(klass.not_null(), "klass not loaded");
207 if (ex_klass->is_subtype_of(klass())) {
208 return handler_bci;
209 }
210 }
211 }
212 }
213
214 return -1;
215 }
216
217 void Method::mask_for(int bci, InterpreterOopMap* mask) {
218
219 Thread* myThread = Thread::current();
220 methodHandle h_this(myThread, this);
221 #ifdef ASSERT
222 bool has_capability = myThread->is_VM_thread() ||
223 myThread->is_ConcurrentGC_thread() ||
224 myThread->is_GC_task_thread();
225
226 if (!has_capability) {
227 if (!VerifyStack && !VerifyLastFrame) {
228 // verify stack calls this outside VM thread
229 warning("oopmap should only be accessed by the "
230 "VM, GC task or CMS threads (or during debugging)");
231 InterpreterOopMap local_mask;
232 method_holder()->mask_for(h_this, bci, &local_mask);
233 local_mask.print();
234 }
235 }
236 #endif
237 method_holder()->mask_for(h_this, bci, mask);
238 return;
239 }
240
241
242 int Method::bci_from(address bcp) const {
243 if (is_native() && bcp == 0) {
244 return 0;
245 }
246 #ifdef ASSERT
247 { ResourceMark rm;
248 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
249 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string()));
250 }
251 #endif
252 return bcp - code_base();
253 }
254
255
256 int Method::validate_bci(int bci) const {
257 return (bci == 0 || bci < code_size()) ? bci : -1;
258 }
259
260 // Return bci 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_bcp(address bcp) const {
265 // keep bci as -1 if not a valid bci
266 int bci = -1;
267 if (bcp == 0 || bcp == 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 (contains(bcp)) {
272 bci = bcp - code_base();
273 }
274 // Assert that if we have dodged any asserts, bci is negative.
275 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
276 return bci;
277 }
278
279 address Method::bcp_from(int bci) const {
280 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), err_msg("illegal bci: %d", bci));
281 address bcp = code_base() + bci;
282 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
283 return bcp;
284 }
285
286 address Method::bcp_from(address bcp) const {
287 if (is_native() && bcp == NULL) {
288 return code_base();
289 } else {
290 return bcp;
291 }
292 }
293
294 int Method::size(bool is_native) {
295 // If native, then include pointers for native_function and signature_handler
296 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
297 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
298 return align_object_size(header_size() + extra_words);
299 }
300
301
302 Symbol* Method::klass_name() const {
303 Klass* k = method_holder();
304 assert(k->is_klass(), "must be klass");
305 InstanceKlass* ik = (InstanceKlass*) k;
306 return ik->name();
307 }
308
309
310 // Attempt to return method oop to original state. Clear any pointers
311 // (to objects outside the shared spaces). We won't be able to predict
312 // where they should point in a new JVM. Further initialize some
313 // entries now in order allow them to be write protected later.
314
315 void Method::remove_unshareable_info() {
316 unlink_method();
317 }
318
319
320 bool Method::was_executed_more_than(int n) {
321 // Invocation counter is reset when the Method* is compiled.
322 // If the method has compiled code we therefore assume it has
323 // be excuted more than n times.
324 if (is_accessor() || is_empty_method() || (code() != NULL)) {
325 // interpreter doesn't bump invocation counter of trivial methods
326 // compiler does not bump invocation counter of compiled methods
327 return true;
328 }
329 else if ((method_counters() != NULL &&
330 method_counters()->invocation_counter()->carry()) ||
331 (method_data() != NULL &&
332 method_data()->invocation_counter()->carry())) {
333 // The carry bit is set when the counter overflows and causes
334 // a compilation to occur. We don't know how many times
335 // the counter has been reset, so we simply assume it has
336 // been executed more than n times.
337 return true;
338 } else {
339 return invocation_count() > n;
340 }
341 }
342
343 void Method::print_invocation_count() {
344 if (is_static()) tty->print("static ");
345 if (is_final()) tty->print("final ");
346 if (is_synchronized()) tty->print("synchronized ");
347 if (is_native()) tty->print("native ");
348 tty->print("%s::", method_holder()->external_name());
349 name()->print_symbol_on(tty);
350 signature()->print_symbol_on(tty);
351
352 if (WizardMode) {
353 // dump the size of the byte codes
354 tty->print(" {%d}", code_size());
355 }
356 tty->cr();
357
358 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
359 tty->print_cr (" invocation_counter: %8d ", invocation_count());
360 tty->print_cr (" backedge_counter: %8d ", backedge_count());
361 #ifndef PRODUCT
362 if (CountCompiledCalls) {
363 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
364 }
365 #endif
366 }
367
368 // Build a MethodData* object to hold information about this method
369 // collected in the interpreter.
370 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
371 // Do not profile method if current thread holds the pending list lock,
372 // which avoids deadlock for acquiring the MethodData_lock.
373 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
374 return;
375 }
376
377 // Grab a lock here to prevent multiple
378 // MethodData*s from being created.
379 MutexLocker ml(MethodData_lock, THREAD);
380 if (method->method_data() == NULL) {
381 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
382 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);
383 method->set_method_data(method_data);
384 if (PrintMethodData && (Verbose || WizardMode)) {
385 ResourceMark rm(THREAD);
386 tty->print("build_interpreter_method_data for ");
387 method->print_name(tty);
388 tty->cr();
389 // At the end of the run, the MDO, full of data, will be dumped.
390 }
391 }
392 }
393
394 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
395 methodHandle mh(m);
396 ClassLoaderData* loader_data = mh->method_holder()->class_loader_data();
397 MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL);
398 if (!mh->init_method_counters(counters)) {
399 MetadataFactory::free_metadata(loader_data, counters);
400 }
401 return mh->method_counters();
402 }
403
404 void Method::cleanup_inline_caches() {
405 // The current system doesn't use inline caches in the interpreter
406 // => nothing to do (keep this method around for future use)
407 }
408
409
410 int Method::extra_stack_words() {
411 // not an inline function, to avoid a header dependency on Interpreter
412 return extra_stack_entries() * Interpreter::stackElementSize;
413 }
414
415
416 void Method::compute_size_of_parameters(Thread *thread) {
417 ArgumentSizeComputer asc(signature());
418 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
419 }
420
421 #ifdef CC_INTERP
422 void Method::set_result_index(BasicType type) {
423 _result_index = Interpreter::BasicType_as_index(type);
424 }
425 #endif
426
427 BasicType Method::result_type() const {
428 ResultTypeFinder rtf(signature());
429 return rtf.type();
430 }
431
432
433 bool Method::is_empty_method() const {
434 return code_size() == 1
435 && *code_base() == Bytecodes::_return;
436 }
437
438
439 bool Method::is_vanilla_constructor() const {
440 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
441 // which only calls the superclass vanilla constructor and possibly does stores of
442 // zero constants to local fields:
443 //
444 // aload_0
445 // invokespecial
446 // indexbyte1
447 // indexbyte2
448 //
449 // followed by an (optional) sequence of:
450 //
451 // aload_0
452 // aconst_null / iconst_0 / fconst_0 / dconst_0
453 // putfield
454 // indexbyte1
455 // indexbyte2
456 //
457 // followed by:
458 //
459 // return
460
461 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
462 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
463 int size = code_size();
464 // Check if size match
465 if (size == 0 || size % 5 != 0) return false;
466 address cb = code_base();
467 int last = size - 1;
468 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
469 // Does not call superclass default constructor
470 return false;
471 }
472 // Check optional sequence
473 for (int i = 4; i < last; i += 5) {
474 if (cb[i] != Bytecodes::_aload_0) return false;
475 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
476 if (cb[i+2] != Bytecodes::_putfield) return false;
477 }
478 return true;
479 }
480
481
482 bool Method::compute_has_loops_flag() {
483 BytecodeStream bcs(this);
484 Bytecodes::Code bc;
485
486 while ((bc = bcs.next()) >= 0) {
487 switch( bc ) {
488 case Bytecodes::_ifeq:
489 case Bytecodes::_ifnull:
490 case Bytecodes::_iflt:
491 case Bytecodes::_ifle:
492 case Bytecodes::_ifne:
493 case Bytecodes::_ifnonnull:
494 case Bytecodes::_ifgt:
495 case Bytecodes::_ifge:
496 case Bytecodes::_if_icmpeq:
497 case Bytecodes::_if_icmpne:
498 case Bytecodes::_if_icmplt:
499 case Bytecodes::_if_icmpgt:
500 case Bytecodes::_if_icmple:
501 case Bytecodes::_if_icmpge:
502 case Bytecodes::_if_acmpeq:
503 case Bytecodes::_if_acmpne:
504 case Bytecodes::_goto:
505 case Bytecodes::_jsr:
506 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
507 break;
508
509 case Bytecodes::_goto_w:
510 case Bytecodes::_jsr_w:
511 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
512 break;
513 }
514 }
515 _access_flags.set_loops_flag_init();
516 return _access_flags.has_loops();
517 }
518
519 bool Method::is_final_method(AccessFlags class_access_flags) const {
520 // or "does_not_require_vtable_entry"
521 // default method or overpass can occur, is not final (reuses vtable entry)
522 // private methods get vtable entries for backward class compatibility.
523 if (is_overpass() || is_default_method()) return false;
524 return is_final() || class_access_flags.is_final();
525 }
526
527 bool Method::is_final_method() const {
528 return is_final_method(method_holder()->access_flags());
529 }
530
531 bool Method::is_default_method() const {
532 if (method_holder() != NULL &&
533 method_holder()->is_interface() &&
534 !is_abstract()) {
535 return true;
536 } else {
537 return false;
538 }
539 }
540
541 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
542 if (is_final_method(class_access_flags)) return true;
543 #ifdef ASSERT
544 ResourceMark rm;
545 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
546 if (class_access_flags.is_interface()) {
547 assert(is_nonv == is_static(), err_msg("is_nonv=%s", name_and_sig_as_C_string()));
548 }
549 #endif
550 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
551 return vtable_index() == nonvirtual_vtable_index;
552 }
553
554 bool Method::can_be_statically_bound() const {
555 return can_be_statically_bound(method_holder()->access_flags());
556 }
557
558 bool Method::is_accessor() const {
559 if (code_size() != 5) return false;
560 if (size_of_parameters() != 1) return false;
561 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
562 if (java_code_at(1) != Bytecodes::_getfield) return false;
563 if (java_code_at(4) != Bytecodes::_areturn &&
564 java_code_at(4) != Bytecodes::_ireturn ) return false;
565 return true;
566 }
567
568 bool Method::is_constant_getter() const {
569 int last_index = code_size() - 1;
570 // Check if the first 1-3 bytecodes are a constant push
571 // and the last bytecode is a return.
572 return (2 <= code_size() && code_size() <= 4 &&
573 Bytecodes::is_const(java_code_at(0)) &&
574 Bytecodes::length_for(java_code_at(0)) == last_index &&
575 Bytecodes::is_return(java_code_at(last_index)));
576 }
577
578 bool Method::is_initializer() const {
579 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
580 }
581
582 bool Method::has_valid_initializer_flags() const {
583 return (is_static() ||
584 method_holder()->major_version() < 51);
585 }
586
587 bool Method::is_static_initializer() const {
588 // For classfiles version 51 or greater, ensure that the clinit method is
589 // static. Non-static methods with the name "<clinit>" are not static
590 // initializers. (older classfiles exempted for backward compatibility)
591 return name() == vmSymbols::class_initializer_name() &&
592 has_valid_initializer_flags();
593 }
594
595
596 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
597 int length = method->checked_exceptions_length();
598 if (length == 0) { // common case
599 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
600 } else {
601 methodHandle h_this(THREAD, method);
602 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
603 objArrayHandle mirrors (THREAD, m_oop);
604 for (int i = 0; i < length; i++) {
605 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
606 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
607 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
608 mirrors->obj_at_put(i, k->java_mirror());
609 }
610 return mirrors;
611 }
612 };
613
614
615 int Method::line_number_from_bci(int bci) const {
616 if (bci == SynchronizationEntryBCI) bci = 0;
617 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
618 int best_bci = 0;
619 int best_line = -1;
620
621 if (has_linenumber_table()) {
622 // The line numbers are a short array of 2-tuples [start_pc, line_number].
623 // Not necessarily sorted and not necessarily one-to-one.
624 CompressedLineNumberReadStream stream(compressed_linenumber_table());
625 while (stream.read_pair()) {
626 if (stream.bci() == bci) {
627 // perfect match
628 return stream.line();
629 } else {
630 // update best_bci/line
631 if (stream.bci() < bci && stream.bci() >= best_bci) {
632 best_bci = stream.bci();
633 best_line = stream.line();
634 }
635 }
636 }
637 }
638 return best_line;
639 }
640
641
642 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
643 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
644 Thread *thread = Thread::current();
645 Symbol* klass_name = constants()->klass_name_at(klass_index);
646 Handle loader(thread, method_holder()->class_loader());
647 Handle prot (thread, method_holder()->protection_domain());
648 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
649 } else {
650 return true;
651 }
652 }
653
654
655 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
656 int klass_index = constants()->klass_ref_index_at(refinfo_index);
657 if (must_be_resolved) {
658 // Make sure klass is resolved in constantpool.
659 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
660 }
661 return is_klass_loaded_by_klass_index(klass_index);
662 }
663
664
665 void Method::set_native_function(address function, bool post_event_flag) {
666 assert(function != NULL, "use clear_native_function to unregister natives");
667 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
668 address* native_function = native_function_addr();
669
670 // We can see racers trying to place the same native function into place. Once
671 // is plenty.
672 address current = *native_function;
673 if (current == function) return;
674 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
675 function != NULL) {
676 // native_method_throw_unsatisfied_link_error_entry() should only
677 // be passed when post_event_flag is false.
678 assert(function !=
679 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
680 "post_event_flag mis-match");
681
682 // post the bind event, and possible change the bind function
683 JvmtiExport::post_native_method_bind(this, &function);
684 }
685 *native_function = function;
686 // This function can be called more than once. We must make sure that we always
687 // use the latest registered method -> check if a stub already has been generated.
688 // If so, we have to make it not_entrant.
689 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
690 if (nm != NULL) {
691 nm->make_not_entrant();
692 }
693 }
694
695
696 bool Method::has_native_function() const {
697 if (is_method_handle_intrinsic())
698 return false; // special-cased in SharedRuntime::generate_native_wrapper
699 address func = native_function();
700 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
701 }
702
703
704 void Method::clear_native_function() {
705 // Note: is_method_handle_intrinsic() is allowed here.
706 set_native_function(
707 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
708 !native_bind_event_is_interesting);
709 clear_code();
710 }
711
712 address Method::critical_native_function() {
713 methodHandle mh(this);
714 return NativeLookup::lookup_critical_entry(mh);
715 }
716
717
718 void Method::set_signature_handler(address handler) {
719 address* signature_handler = signature_handler_addr();
720 *signature_handler = handler;
721 }
722
723
724 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
725 if (PrintCompilation && report) {
726 ttyLocker ttyl;
727 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
728 if (comp_level == CompLevel_all) {
729 tty->print("all levels ");
730 } else {
731 tty->print("levels ");
732 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
733 tty->print("%d ", i);
734 }
735 }
736 this->print_short_name(tty);
737 int size = this->code_size();
738 if (size > 0) {
739 tty->print(" (%d bytes)", size);
740 }
741 if (reason != NULL) {
742 tty->print(" %s", reason);
743 }
744 tty->cr();
745 }
746 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
747 ttyLocker ttyl;
748 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
749 os::current_thread_id(), is_osr, comp_level);
750 if (reason != NULL) {
751 xtty->print(" reason=\'%s\'", reason);
752 }
753 xtty->method(this);
754 xtty->stamp();
755 xtty->end_elem();
756 }
757 }
758
759 bool Method::is_always_compilable() const {
760 // Generated adapters must be compiled
761 if (is_method_handle_intrinsic() && is_synthetic()) {
762 assert(!is_not_c1_compilable(), "sanity check");
763 assert(!is_not_c2_compilable(), "sanity check");
764 return true;
765 }
766
767 return false;
768 }
769
770 bool Method::is_not_compilable(int comp_level) const {
771 if (number_of_breakpoints() > 0)
772 return true;
773 if (is_always_compilable())
774 return false;
775 if (comp_level == CompLevel_any)
776 return is_not_c1_compilable() || is_not_c2_compilable();
777 if (is_c1_compile(comp_level))
778 return is_not_c1_compilable();
779 if (is_c2_compile(comp_level))
780 return is_not_c2_compilable();
781 return false;
782 }
783
784 // call this when compiler finds that this method is not compilable
785 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
786 if (is_always_compilable()) {
787 // Don't mark a method which should be always compilable
788 return;
789 }
790 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
791 if (comp_level == CompLevel_all) {
792 set_not_c1_compilable();
793 set_not_c2_compilable();
794 } else {
795 if (is_c1_compile(comp_level))
796 set_not_c1_compilable();
797 if (is_c2_compile(comp_level))
798 set_not_c2_compilable();
799 }
800 CompilationPolicy::policy()->disable_compilation(this);
801 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
802 }
803
804 bool Method::is_not_osr_compilable(int comp_level) const {
805 if (is_not_compilable(comp_level))
806 return true;
807 if (comp_level == CompLevel_any)
808 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
809 if (is_c1_compile(comp_level))
810 return is_not_c1_osr_compilable();
811 if (is_c2_compile(comp_level))
812 return is_not_c2_osr_compilable();
813 return false;
814 }
815
816 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
817 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
818 if (comp_level == CompLevel_all) {
819 set_not_c1_osr_compilable();
820 set_not_c2_osr_compilable();
821 } else {
822 if (is_c1_compile(comp_level))
823 set_not_c1_osr_compilable();
824 if (is_c2_compile(comp_level))
825 set_not_c2_osr_compilable();
826 }
827 CompilationPolicy::policy()->disable_compilation(this);
828 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
829 }
830
831 // Revert to using the interpreter and clear out the nmethod
832 void Method::clear_code() {
833
834 // this may be NULL if c2i adapters have not been made yet
835 // Only should happen at allocate time.
836 if (_adapter == NULL) {
837 _from_compiled_entry = NULL;
838 } else {
839 _from_compiled_entry = _adapter->get_c2i_entry();
840 }
841 OrderAccess::storestore();
842 _from_interpreted_entry = _i2i_entry;
843 OrderAccess::storestore();
844 _code = NULL;
845 }
846
847 // Called by class data sharing to remove any entry points (which are not shared)
848 void Method::unlink_method() {
849 _code = NULL;
850 _i2i_entry = NULL;
851 _from_interpreted_entry = NULL;
852 if (is_native()) {
853 *native_function_addr() = NULL;
854 set_signature_handler(NULL);
855 }
856 NOT_PRODUCT(set_compiled_invocation_count(0);)
857 _adapter = NULL;
858 _from_compiled_entry = NULL;
859
860 // In case of DumpSharedSpaces, _method_data should always be NULL.
861 //
862 // During runtime (!DumpSharedSpaces), when we are cleaning a
863 // shared class that failed to load, this->link_method() may
864 // have already been called (before an exception happened), so
865 // this->_method_data may not be NULL.
866 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?");
867
868 set_method_data(NULL);
869 clear_method_counters();
870 }
871
872 // Called when the method_holder is getting linked. Setup entrypoints so the method
873 // is ready to be called from interpreter, compiler, and vtables.
874 void Method::link_method(methodHandle h_method, TRAPS) {
875 // If the code cache is full, we may reenter this function for the
876 // leftover methods that weren't linked.
877 if (_i2i_entry != NULL) return;
878
879 assert(_adapter == NULL, "init'd to NULL" );
880 assert( _code == NULL, "nothing compiled yet" );
881
882 // Setup interpreter entrypoint
883 assert(this == h_method(), "wrong h_method()" );
884 address entry = Interpreter::entry_for_method(h_method);
885 assert(entry != NULL, "interpreter entry must be non-null");
886 // Sets both _i2i_entry and _from_interpreted_entry
887 set_interpreter_entry(entry);
888
889 // Don't overwrite already registered native entries.
890 if (is_native() && !has_native_function()) {
891 set_native_function(
892 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
893 !native_bind_event_is_interesting);
894 }
895
896 // Setup compiler entrypoint. This is made eagerly, so we do not need
897 // special handling of vtables. An alternative is to make adapters more
898 // lazily by calling make_adapter() from from_compiled_entry() for the
899 // normal calls. For vtable calls life gets more complicated. When a
900 // call-site goes mega-morphic we need adapters in all methods which can be
901 // called from the vtable. We need adapters on such methods that get loaded
902 // later. Ditto for mega-morphic itable calls. If this proves to be a
903 // problem we'll make these lazily later.
904 (void) make_adapters(h_method, CHECK);
905
906 // ONLY USE the h_method now as make_adapter may have blocked
907
908 }
909
910 address Method::make_adapters(methodHandle mh, TRAPS) {
911 // Adapters for compiled code are made eagerly here. They are fairly
912 // small (generally < 100 bytes) and quick to make (and cached and shared)
913 // so making them eagerly shouldn't be too expensive.
914 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
915 if (adapter == NULL ) {
916 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
917 }
918
919 mh->set_adapter_entry(adapter);
920 mh->_from_compiled_entry = adapter->get_c2i_entry();
921 return adapter->get_c2i_entry();
922 }
923
924 void Method::restore_unshareable_info(TRAPS) {
925 // Since restore_unshareable_info can be called more than once for a method, don't
926 // redo any work. If this field is restored, there is nothing to do.
927 if (_from_compiled_entry == NULL) {
928 // restore method's vtable by calling a virtual function
929 restore_vtable();
930
931 methodHandle mh(THREAD, this);
932 link_method(mh, CHECK);
933 }
934 }
935
936
937 // The verified_code_entry() must be called when a invoke is resolved
938 // on this method.
939
940 // It returns the compiled code entry point, after asserting not null.
941 // This function is called after potential safepoints so that nmethod
942 // or adapter that it points to is still live and valid.
943 // This function must not hit a safepoint!
944 address Method::verified_code_entry() {
945 debug_only(No_Safepoint_Verifier nsv;)
946 assert(_from_compiled_entry != NULL, "must be set");
947 return _from_compiled_entry;
948 }
949
950 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
951 // (could be racing a deopt).
952 // Not inline to avoid circular ref.
953 bool Method::check_code() const {
954 // cached in a register or local. There's a race on the value of the field.
955 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
956 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
957 }
958
959 // Install compiled code. Instantly it can execute.
960 void Method::set_code(methodHandle mh, nmethod *code) {
961 assert( code, "use clear_code to remove code" );
962 assert( mh->check_code(), "" );
963
964 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
965
966 // These writes must happen in this order, because the interpreter will
967 // directly jump to from_interpreted_entry which jumps to an i2c adapter
968 // which jumps to _from_compiled_entry.
969 mh->_code = code; // Assign before allowing compiled code to exec
970
971 int comp_level = code->comp_level();
972 // In theory there could be a race here. In practice it is unlikely
973 // and not worth worrying about.
974 if (comp_level > mh->highest_comp_level()) {
975 mh->set_highest_comp_level(comp_level);
976 }
977
978 OrderAccess::storestore();
979 #ifdef SHARK
980 mh->_from_interpreted_entry = code->insts_begin();
981 #else //!SHARK
982 mh->_from_compiled_entry = code->verified_entry_point();
983 OrderAccess::storestore();
984 // Instantly compiled code can execute.
985 if (!mh->is_method_handle_intrinsic())
986 mh->_from_interpreted_entry = mh->get_i2c_entry();
987 #endif //!SHARK
988 }
989
990
991 bool Method::is_overridden_in(Klass* k) const {
992 InstanceKlass* ik = InstanceKlass::cast(k);
993
994 if (ik->is_interface()) return false;
995
996 // If method is an interface, we skip it - except if it
997 // is a miranda method
998 if (method_holder()->is_interface()) {
999 // Check that method is not a miranda method
1000 if (ik->lookup_method(name(), signature()) == NULL) {
1001 // No implementation exist - so miranda method
1002 return false;
1003 }
1004 return true;
1005 }
1006
1007 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1008 assert(ik->vtable() != NULL, "vtable should exist");
1009 if (!has_vtable_index()) {
1010 return false;
1011 } else {
1012 Method* vt_m = ik->method_at_vtable(vtable_index());
1013 return vt_m != this;
1014 }
1015 }
1016
1017
1018 // give advice about whether this Method* should be cached or not
1019 bool Method::should_not_be_cached() const {
1020 if (is_old()) {
1021 // This method has been redefined. It is either EMCP or obsolete
1022 // and we don't want to cache it because that would pin the method
1023 // down and prevent it from being collectible if and when it
1024 // finishes executing.
1025 return true;
1026 }
1027
1028 // caching this method should be just fine
1029 return false;
1030 }
1031
1032
1033 /**
1034 * Returns true if this is one of the specially treated methods for
1035 * security related stack walks (like Reflection.getCallerClass).
1036 */
1037 bool Method::is_ignored_by_security_stack_walk() const {
1038 if (intrinsic_id() == vmIntrinsics::_invoke) {
1039 // This is Method.invoke() -- ignore it
1040 return true;
1041 }
1042 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1043 // This is an auxilary frame -- ignore it
1044 return true;
1045 }
1046 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1047 // This is an internal adapter frame for method handles -- ignore it
1048 return true;
1049 }
1050 return false;
1051 }
1052
1053
1054 // Constant pool structure for invoke methods:
1055 enum {
1056 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1057 _imcp_invoke_signature, // utf8: (variable Symbol*)
1058 _imcp_limit
1059 };
1060
1061 // Test if this method is an MH adapter frame generated by Java code.
1062 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1063 bool Method::is_compiled_lambda_form() const {
1064 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1065 }
1066
1067 // Test if this method is an internal MH primitive method.
1068 bool Method::is_method_handle_intrinsic() const {
1069 vmIntrinsics::ID iid = intrinsic_id();
1070 return (MethodHandles::is_signature_polymorphic(iid) &&
1071 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1072 }
1073
1074 bool Method::has_member_arg() const {
1075 vmIntrinsics::ID iid = intrinsic_id();
1076 return (MethodHandles::is_signature_polymorphic(iid) &&
1077 MethodHandles::has_member_arg(iid));
1078 }
1079
1080 // Make an instance of a signature-polymorphic internal MH primitive.
1081 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1082 Symbol* signature,
1083 TRAPS) {
1084 ResourceMark rm;
1085 methodHandle empty;
1086
1087 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1088 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1089 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1090 if (TraceMethodHandles) {
1091 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1092 }
1093
1094 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1095 name->increment_refcount();
1096 signature->increment_refcount();
1097
1098 int cp_length = _imcp_limit;
1099 ClassLoaderData* loader_data = holder->class_loader_data();
1100 constantPoolHandle cp;
1101 {
1102 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1103 cp = constantPoolHandle(THREAD, cp_oop);
1104 }
1105 cp->set_pool_holder(InstanceKlass::cast(holder()));
1106 cp->symbol_at_put(_imcp_invoke_name, name);
1107 cp->symbol_at_put(_imcp_invoke_signature, signature);
1108 cp->set_has_preresolution();
1109
1110 // decide on access bits: public or not?
1111 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1112 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1113 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1114 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1115
1116 methodHandle m;
1117 {
1118 InlineTableSizes sizes;
1119 Method* m_oop = Method::allocate(loader_data, 0,
1120 accessFlags_from(flags_bits), &sizes,
1121 ConstMethod::NORMAL, CHECK_(empty));
1122 m = methodHandle(THREAD, m_oop);
1123 }
1124 m->set_constants(cp());
1125 m->set_name_index(_imcp_invoke_name);
1126 m->set_signature_index(_imcp_invoke_signature);
1127 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1128 assert(m->signature() == signature, "");
1129 #ifdef CC_INTERP
1130 ResultTypeFinder rtf(signature);
1131 m->set_result_index(rtf.type());
1132 #endif
1133 m->compute_size_of_parameters(THREAD);
1134 m->init_intrinsic_id();
1135 assert(m->is_method_handle_intrinsic(), "");
1136 #ifdef ASSERT
1137 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1138 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1139 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1140 #endif //ASSERT
1141
1142 // Finally, set up its entry points.
1143 assert(m->can_be_statically_bound(), "");
1144 m->set_vtable_index(Method::nonvirtual_vtable_index);
1145 m->link_method(m, CHECK_(empty));
1146
1147 if (TraceMethodHandles && (Verbose || WizardMode))
1148 m->print_on(tty);
1149
1150 return m;
1151 }
1152
1153 Klass* Method::check_non_bcp_klass(Klass* klass) {
1154 if (klass != NULL && klass->class_loader() != NULL) {
1155 if (klass->oop_is_objArray())
1156 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1157 return klass;
1158 }
1159 return NULL;
1160 }
1161
1162
1163 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1164 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1165 // Code below does not work for native methods - they should never get rewritten anyway
1166 assert(!m->is_native(), "cannot rewrite native methods");
1167 // Allocate new Method*
1168 AccessFlags flags = m->access_flags();
1169
1170 ConstMethod* cm = m->constMethod();
1171 int checked_exceptions_len = cm->checked_exceptions_length();
1172 int localvariable_len = cm->localvariable_table_length();
1173 int exception_table_len = cm->exception_table_length();
1174 int method_parameters_len = cm->method_parameters_length();
1175 int method_annotations_len = cm->method_annotations_length();
1176 int parameter_annotations_len = cm->parameter_annotations_length();
1177 int type_annotations_len = cm->type_annotations_length();
1178 int default_annotations_len = cm->default_annotations_length();
1179
1180 InlineTableSizes sizes(
1181 localvariable_len,
1182 new_compressed_linenumber_size,
1183 exception_table_len,
1184 checked_exceptions_len,
1185 method_parameters_len,
1186 cm->generic_signature_index(),
1187 method_annotations_len,
1188 parameter_annotations_len,
1189 type_annotations_len,
1190 default_annotations_len,
1191 0);
1192
1193 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1194 Method* newm_oop = Method::allocate(loader_data,
1195 new_code_length,
1196 flags,
1197 &sizes,
1198 m->method_type(),
1199 CHECK_(methodHandle()));
1200 methodHandle newm (THREAD, newm_oop);
1201 int new_method_size = newm->method_size();
1202
1203 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1204 ConstMethod* newcm = newm->constMethod();
1205 int new_const_method_size = newm->constMethod()->size();
1206
1207 memcpy(newm(), m(), sizeof(Method));
1208
1209 // Create shallow copy of ConstMethod.
1210 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1211
1212 // Reset correct method/const method, method size, and parameter info
1213 newm->set_constMethod(newcm);
1214 newm->constMethod()->set_code_size(new_code_length);
1215 newm->constMethod()->set_constMethod_size(new_const_method_size);
1216 newm->set_method_size(new_method_size);
1217 assert(newm->code_size() == new_code_length, "check");
1218 assert(newm->method_parameters_length() == method_parameters_len, "check");
1219 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1220 assert(newm->exception_table_length() == exception_table_len, "check");
1221 assert(newm->localvariable_table_length() == localvariable_len, "check");
1222 // Copy new byte codes
1223 memcpy(newm->code_base(), new_code, new_code_length);
1224 // Copy line number table
1225 if (new_compressed_linenumber_size > 0) {
1226 memcpy(newm->compressed_linenumber_table(),
1227 new_compressed_linenumber_table,
1228 new_compressed_linenumber_size);
1229 }
1230 // Copy method_parameters
1231 if (method_parameters_len > 0) {
1232 memcpy(newm->method_parameters_start(),
1233 m->method_parameters_start(),
1234 method_parameters_len * sizeof(MethodParametersElement));
1235 }
1236 // Copy checked_exceptions
1237 if (checked_exceptions_len > 0) {
1238 memcpy(newm->checked_exceptions_start(),
1239 m->checked_exceptions_start(),
1240 checked_exceptions_len * sizeof(CheckedExceptionElement));
1241 }
1242 // Copy exception table
1243 if (exception_table_len > 0) {
1244 memcpy(newm->exception_table_start(),
1245 m->exception_table_start(),
1246 exception_table_len * sizeof(ExceptionTableElement));
1247 }
1248 // Copy local variable number table
1249 if (localvariable_len > 0) {
1250 memcpy(newm->localvariable_table_start(),
1251 m->localvariable_table_start(),
1252 localvariable_len * sizeof(LocalVariableTableElement));
1253 }
1254 // Copy stackmap table
1255 if (m->has_stackmap_table()) {
1256 int code_attribute_length = m->stackmap_data()->length();
1257 Array<u1>* stackmap_data =
1258 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1259 memcpy((void*)stackmap_data->adr_at(0),
1260 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1261 newm->set_stackmap_data(stackmap_data);
1262 }
1263
1264 // copy annotations over to new method
1265 newcm->copy_annotations_from(cm);
1266 return newm;
1267 }
1268
1269 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1270 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1271 // because we are not loading from core libraries
1272 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1273 // which does not use the class default class loader so we check for its loader here
1274 InstanceKlass* ik = InstanceKlass::cast(holder);
1275 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) {
1276 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1277 }
1278
1279 // see if the klass name is well-known:
1280 Symbol* klass_name = ik->name();
1281 return vmSymbols::find_sid(klass_name);
1282 }
1283
1284 void Method::init_intrinsic_id() {
1285 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1286 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1287 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1288 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1289
1290 // the klass name is well-known:
1291 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1292 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1293
1294 // ditto for method and signature:
1295 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1296 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1297 && name_id == vmSymbols::NO_SID)
1298 return;
1299 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1300 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1301 && sig_id == vmSymbols::NO_SID) return;
1302 jshort flags = access_flags().as_short();
1303
1304 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1305 if (id != vmIntrinsics::_none) {
1306 set_intrinsic_id(id);
1307 if (id == vmIntrinsics::_Class_cast) {
1308 // Even if the intrinsic is rejected, we want to inline this simple method.
1309 set_force_inline(true);
1310 }
1311 return;
1312 }
1313
1314 // A few slightly irregular cases:
1315 switch (klass_id) {
1316 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1317 // Second chance: check in regular Math.
1318 switch (name_id) {
1319 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1320 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1321 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1322 // pretend it is the corresponding method in the non-strict class:
1323 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1324 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1325 break;
1326 }
1327 break;
1328
1329 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1330 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1331 if (!is_native()) break;
1332 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1333 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1334 id = vmIntrinsics::_none;
1335 break;
1336 }
1337
1338 if (id != vmIntrinsics::_none) {
1339 // Set up its iid. It is an alias method.
1340 set_intrinsic_id(id);
1341 return;
1342 }
1343 }
1344
1345 // These two methods are static since a GC may move the Method
1346 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1347 if (THREAD->is_Compiler_thread()) {
1348 // There is nothing useful this routine can do from within the Compile thread.
1349 // Hopefully, the signature contains only well-known classes.
1350 // We could scan for this and return true/false, but the caller won't care.
1351 return false;
1352 }
1353 bool sig_is_loaded = true;
1354 Handle class_loader(THREAD, m->method_holder()->class_loader());
1355 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1356 ResourceMark rm(THREAD);
1357 Symbol* signature = m->signature();
1358 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1359 if (ss.is_object()) {
1360 Symbol* sym = ss.as_symbol(CHECK_(false));
1361 Symbol* name = sym;
1362 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1363 protection_domain, THREAD);
1364 // We are loading classes eagerly. If a ClassNotFoundException or
1365 // a LinkageError was generated, be sure to ignore it.
1366 if (HAS_PENDING_EXCEPTION) {
1367 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1368 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1369 CLEAR_PENDING_EXCEPTION;
1370 } else {
1371 return false;
1372 }
1373 }
1374 if( klass == NULL) { sig_is_loaded = false; }
1375 }
1376 }
1377 return sig_is_loaded;
1378 }
1379
1380 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1381 Handle class_loader(THREAD, m->method_holder()->class_loader());
1382 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1383 ResourceMark rm(THREAD);
1384 Symbol* signature = m->signature();
1385 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1386 if (ss.type() == T_OBJECT) {
1387 Symbol* name = ss.as_symbol_or_null();
1388 if (name == NULL) return true;
1389 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1390 if (klass == NULL) return true;
1391 }
1392 }
1393 return false;
1394 }
1395
1396 // Exposed so field engineers can debug VM
1397 void Method::print_short_name(outputStream* st) {
1398 ResourceMark rm;
1399 #ifdef PRODUCT
1400 st->print(" %s::", method_holder()->external_name());
1401 #else
1402 st->print(" %s::", method_holder()->internal_name());
1403 #endif
1404 name()->print_symbol_on(st);
1405 if (WizardMode) signature()->print_symbol_on(st);
1406 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1407 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1408 }
1409
1410 // Comparer for sorting an object array containing
1411 // Method*s.
1412 static int method_comparator(Method* a, Method* b) {
1413 return a->name()->fast_compare(b->name());
1414 }
1415
1416 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1417 // default_methods also uses this without the ordering for fast find_method
1418 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1419 int length = methods->length();
1420 if (length > 1) {
1421 {
1422 No_Safepoint_Verifier nsv;
1423 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1424 }
1425 // Reset method ordering
1426 if (set_idnums) {
1427 for (int i = 0; i < length; i++) {
1428 Method* m = methods->at(i);
1429 m->set_method_idnum(i);
1430 }
1431 }
1432 }
1433 }
1434
1435 //-----------------------------------------------------------------------------------
1436 // Non-product code unless JVM/TI needs it
1437
1438 #if !defined(PRODUCT) || INCLUDE_JVMTI
1439 class SignatureTypePrinter : public SignatureTypeNames {
1440 private:
1441 outputStream* _st;
1442 bool _use_separator;
1443
1444 void type_name(const char* name) {
1445 if (_use_separator) _st->print(", ");
1446 _st->print("%s", name);
1447 _use_separator = true;
1448 }
1449
1450 public:
1451 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1452 _st = st;
1453 _use_separator = false;
1454 }
1455
1456 void print_parameters() { _use_separator = false; iterate_parameters(); }
1457 void print_returntype() { _use_separator = false; iterate_returntype(); }
1458 };
1459
1460
1461 void Method::print_name(outputStream* st) {
1462 Thread *thread = Thread::current();
1463 ResourceMark rm(thread);
1464 SignatureTypePrinter sig(signature(), st);
1465 st->print("%s ", is_static() ? "static" : "virtual");
1466 sig.print_returntype();
1467 st->print(" %s.", method_holder()->internal_name());
1468 name()->print_symbol_on(st);
1469 st->print("(");
1470 sig.print_parameters();
1471 st->print(")");
1472 }
1473 #endif // !PRODUCT || INCLUDE_JVMTI
1474
1475
1476 void Method::print_codes_on(outputStream* st) const {
1477 print_codes_on(0, code_size(), st);
1478 }
1479
1480 void Method::print_codes_on(int from, int to, outputStream* st) const {
1481 Thread *thread = Thread::current();
1482 ResourceMark rm(thread);
1483 methodHandle mh (thread, (Method*)this);
1484 BytecodeStream s(mh);
1485 s.set_interval(from, to);
1486 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1487 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1488 }
1489
1490
1491 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1492 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1493 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1494 // as end-of-stream terminator.
1495
1496 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1497 // bci and line number does not compress into single byte.
1498 // Write out escape character and use regular compression for bci and line number.
1499 write_byte((jubyte)0xFF);
1500 write_signed_int(bci_delta);
1501 write_signed_int(line_delta);
1502 }
1503
1504 // See comment in method.hpp which explains why this exists.
1505 #if defined(_M_AMD64) && _MSC_VER >= 1400
1506 #pragma optimize("", off)
1507 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1508 write_pair_inline(bci, line);
1509 }
1510 #pragma optimize("", on)
1511 #endif
1512
1513 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1514 _bci = 0;
1515 _line = 0;
1516 };
1517
1518
1519 bool CompressedLineNumberReadStream::read_pair() {
1520 jubyte next = read_byte();
1521 // Check for terminator
1522 if (next == 0) return false;
1523 if (next == 0xFF) {
1524 // Escape character, regular compression used
1525 _bci += read_signed_int();
1526 _line += read_signed_int();
1527 } else {
1528 // Single byte compression used
1529 _bci += next >> 3;
1530 _line += next & 0x7;
1531 }
1532 return true;
1533 }
1534
1535
1536 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1537 BreakpointInfo* bp = method_holder()->breakpoints();
1538 for (; bp != NULL; bp = bp->next()) {
1539 if (bp->match(this, bci)) {
1540 return bp->orig_bytecode();
1541 }
1542 }
1543 {
1544 ResourceMark rm;
1545 fatal(err_msg("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci));
1546 }
1547 return Bytecodes::_shouldnotreachhere;
1548 }
1549
1550 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1551 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1552 BreakpointInfo* bp = method_holder()->breakpoints();
1553 for (; bp != NULL; bp = bp->next()) {
1554 if (bp->match(this, bci)) {
1555 bp->set_orig_bytecode(code);
1556 // and continue, in case there is more than one
1557 }
1558 }
1559 }
1560
1561 void Method::set_breakpoint(int bci) {
1562 InstanceKlass* ik = method_holder();
1563 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1564 bp->set_next(ik->breakpoints());
1565 ik->set_breakpoints(bp);
1566 // do this last:
1567 bp->set(this);
1568 }
1569
1570 static void clear_matches(Method* m, int bci) {
1571 InstanceKlass* ik = m->method_holder();
1572 BreakpointInfo* prev_bp = NULL;
1573 BreakpointInfo* next_bp;
1574 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1575 next_bp = bp->next();
1576 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1577 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1578 // do this first:
1579 bp->clear(m);
1580 // unhook it
1581 if (prev_bp != NULL)
1582 prev_bp->set_next(next_bp);
1583 else
1584 ik->set_breakpoints(next_bp);
1585 delete bp;
1586 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1587 // at same location. So we have multiple matching (method_index and bci)
1588 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1589 // breakpoint for clear_breakpoint request and keep all other method versions
1590 // BreakpointInfo for future clear_breakpoint request.
1591 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1592 // which is being called when class is unloaded. We delete all the Breakpoint
1593 // information for all versions of method. We may not correctly restore the original
1594 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1595 // so these methods won't be used anymore.
1596 if (bci >= 0) {
1597 break;
1598 }
1599 } else {
1600 // This one is a keeper.
1601 prev_bp = bp;
1602 }
1603 }
1604 }
1605
1606 void Method::clear_breakpoint(int bci) {
1607 assert(bci >= 0, "");
1608 clear_matches(this, bci);
1609 }
1610
1611 void Method::clear_all_breakpoints() {
1612 clear_matches(this, -1);
1613 }
1614
1615
1616 int Method::invocation_count() {
1617 MethodCounters *mcs = method_counters();
1618 if (TieredCompilation) {
1619 MethodData* const mdo = method_data();
1620 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1621 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1622 return InvocationCounter::count_limit;
1623 } else {
1624 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1625 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1626 }
1627 } else {
1628 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1629 }
1630 }
1631
1632 int Method::backedge_count() {
1633 MethodCounters *mcs = method_counters();
1634 if (TieredCompilation) {
1635 MethodData* const mdo = method_data();
1636 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1637 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1638 return InvocationCounter::count_limit;
1639 } else {
1640 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1641 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1642 }
1643 } else {
1644 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1645 }
1646 }
1647
1648 int Method::highest_comp_level() const {
1649 const MethodCounters* mcs = method_counters();
1650 if (mcs != NULL) {
1651 return mcs->highest_comp_level();
1652 } else {
1653 return CompLevel_none;
1654 }
1655 }
1656
1657 int Method::highest_osr_comp_level() const {
1658 const MethodCounters* mcs = method_counters();
1659 if (mcs != NULL) {
1660 return mcs->highest_osr_comp_level();
1661 } else {
1662 return CompLevel_none;
1663 }
1664 }
1665
1666 void Method::set_highest_comp_level(int level) {
1667 MethodCounters* mcs = method_counters();
1668 if (mcs != NULL) {
1669 mcs->set_highest_comp_level(level);
1670 }
1671 }
1672
1673 void Method::set_highest_osr_comp_level(int level) {
1674 MethodCounters* mcs = method_counters();
1675 if (mcs != NULL) {
1676 mcs->set_highest_osr_comp_level(level);
1677 }
1678 }
1679
1680 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1681 _bci = bci;
1682 _name_index = m->name_index();
1683 _signature_index = m->signature_index();
1684 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1685 if (_orig_bytecode == Bytecodes::_breakpoint)
1686 _orig_bytecode = m->orig_bytecode_at(_bci);
1687 _next = NULL;
1688 }
1689
1690 void BreakpointInfo::set(Method* method) {
1691 #ifdef ASSERT
1692 {
1693 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1694 if (code == Bytecodes::_breakpoint)
1695 code = method->orig_bytecode_at(_bci);
1696 assert(orig_bytecode() == code, "original bytecode must be the same");
1697 }
1698 #endif
1699 Thread *thread = Thread::current();
1700 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1701 method->incr_number_of_breakpoints(thread);
1702 SystemDictionary::notice_modification();
1703 {
1704 // Deoptimize all dependents on this method
1705 HandleMark hm(thread);
1706 methodHandle mh(thread, method);
1707 Universe::flush_dependents_on_method(mh);
1708 }
1709 }
1710
1711 void BreakpointInfo::clear(Method* method) {
1712 *method->bcp_from(_bci) = orig_bytecode();
1713 assert(method->number_of_breakpoints() > 0, "must not go negative");
1714 method->decr_number_of_breakpoints(Thread::current());
1715 }
1716
1717 // jmethodID handling
1718
1719 // This is a block allocating object, sort of like JNIHandleBlock, only a
1720 // lot simpler. There aren't many of these, they aren't long, they are rarely
1721 // deleted and so we can do some suboptimal things.
1722 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1723 // never get rid of it.
1724 // It would be nice to be able to parameterize the number of methods for
1725 // the null_class_loader but then we'd have to turn this and ClassLoaderData
1726 // into templates.
1727
1728 // I feel like this brain dead class should exist somewhere in the STL
1729
1730 class JNIMethodBlock : public CHeapObj<mtClass> {
1731 enum { number_of_methods = 8 };
1732
1733 Method* _methods[number_of_methods];
1734 int _top;
1735 JNIMethodBlock* _next;
1736 public:
1737 static Method* const _free_method;
1738
1739 JNIMethodBlock() : _next(NULL), _top(0) {
1740 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method;
1741 }
1742
1743 Method** add_method(Method* m) {
1744 if (_top < number_of_methods) {
1745 // top points to the next free entry.
1746 int i = _top;
1747 _methods[i] = m;
1748 _top++;
1749 return &_methods[i];
1750 } else if (_top == number_of_methods) {
1751 // if the next free entry ran off the block see if there's a free entry
1752 for (int i = 0; i< number_of_methods; i++) {
1753 if (_methods[i] == _free_method) {
1754 _methods[i] = m;
1755 return &_methods[i];
1756 }
1757 }
1758 // Only check each block once for frees. They're very unlikely.
1759 // Increment top past the end of the block.
1760 _top++;
1761 }
1762 // need to allocate a next block.
1763 if (_next == NULL) {
1764 _next = new JNIMethodBlock();
1765 }
1766 return _next->add_method(m);
1767 }
1768
1769 bool contains(Method** m) {
1770 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1771 for (int i = 0; i< number_of_methods; i++) {
1772 if (&(b->_methods[i]) == m) {
1773 return true;
1774 }
1775 }
1776 }
1777 return false; // not found
1778 }
1779
1780 // Doesn't really destroy it, just marks it as free so it can be reused.
1781 void destroy_method(Method** m) {
1782 #ifdef ASSERT
1783 assert(contains(m), "should be a methodID");
1784 #endif // ASSERT
1785 *m = _free_method;
1786 }
1787
1788 // During class unloading the methods are cleared, which is different
1789 // than freed.
1790 void clear_all_methods() {
1791 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1792 for (int i = 0; i< number_of_methods; i++) {
1793 _methods[i] = NULL;
1794 }
1795 }
1796 }
1797 #ifndef PRODUCT
1798 int count_methods() {
1799 // count all allocated methods
1800 int count = 0;
1801 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1802 for (int i = 0; i< number_of_methods; i++) {
1803 if (_methods[i] != _free_method) count++;
1804 }
1805 }
1806 return count;
1807 }
1808 #endif // PRODUCT
1809 };
1810
1811 // Something that can't be mistaken for an address or a markOop
1812 Method* const JNIMethodBlock::_free_method = (Method*)55;
1813
1814 // Add a method id to the jmethod_ids
1815 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
1816 ClassLoaderData* cld = loader_data;
1817
1818 if (!SafepointSynchronize::is_at_safepoint()) {
1819 // Have to add jmethod_ids() to class loader data thread-safely.
1820 // Also have to add the method to the list safely, which the cld lock
1821 // protects as well.
1822 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1823 if (cld->jmethod_ids() == NULL) {
1824 cld->set_jmethod_ids(new JNIMethodBlock());
1825 }
1826 // jmethodID is a pointer to Method*
1827 return (jmethodID)cld->jmethod_ids()->add_method(m);
1828 } else {
1829 // At safepoint, we are single threaded and can set this.
1830 if (cld->jmethod_ids() == NULL) {
1831 cld->set_jmethod_ids(new JNIMethodBlock());
1832 }
1833 // jmethodID is a pointer to Method*
1834 return (jmethodID)cld->jmethod_ids()->add_method(m);
1835 }
1836 }
1837
1838 // Mark a jmethodID as free. This is called when there is a data race in
1839 // InstanceKlass while creating the jmethodID cache.
1840 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
1841 ClassLoaderData* cld = loader_data;
1842 Method** ptr = (Method**)m;
1843 assert(cld->jmethod_ids() != NULL, "should have method handles");
1844 cld->jmethod_ids()->destroy_method(ptr);
1845 }
1846
1847 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
1848 // Can't assert the method_holder is the same because the new method has the
1849 // scratch method holder.
1850 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
1851 == new_method->method_holder()->class_loader(),
1852 "changing to a different class loader");
1853 // Just change the method in place, jmethodID pointer doesn't change.
1854 *((Method**)jmid) = new_method;
1855 }
1856
1857 bool Method::is_method_id(jmethodID mid) {
1858 Method* m = resolve_jmethod_id(mid);
1859 assert(m != NULL, "should be called with non-null method");
1860 InstanceKlass* ik = m->method_holder();
1861 ClassLoaderData* cld = ik->class_loader_data();
1862 if (cld->jmethod_ids() == NULL) return false;
1863 return (cld->jmethod_ids()->contains((Method**)mid));
1864 }
1865
1866 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
1867 if (mid == NULL) return NULL;
1868 Method* o = resolve_jmethod_id(mid);
1869 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
1870 return NULL;
1871 }
1872 return o;
1873 };
1874
1875 void Method::set_on_stack(const bool value) {
1876 // Set both the method itself and its constant pool. The constant pool
1877 // on stack means some method referring to it is also on the stack.
1878 constants()->set_on_stack(value);
1879
1880 bool succeeded = _access_flags.set_on_stack(value);
1881 if (value && succeeded) {
1882 MetadataOnStackMark::record(this, Thread::current());
1883 }
1884 }
1885
1886 // Called when the class loader is unloaded to make all methods weak.
1887 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1888 loader_data->jmethod_ids()->clear_all_methods();
1889 }
1890
1891 bool Method::has_method_vptr(const void* ptr) {
1892 Method m;
1893 // This assumes that the vtbl pointer is the first word of a C++ object.
1894 // This assumption is also in universe.cpp patch_klass_vtble
1895 void* vtbl2 = dereference_vptr((const void*)&m);
1896 void* this_vtbl = dereference_vptr(ptr);
1897 return vtbl2 == this_vtbl;
1898 }
1899
1900 // Check that this pointer is valid by checking that the vtbl pointer matches
1901 bool Method::is_valid_method() const {
1902 if (this == NULL) {
1903 return false;
1904 } else if (!is_metaspace_object()) {
1905 return false;
1906 } else {
1907 return has_method_vptr((const void*)this);
1908 }
1909 }
1910
1911 #ifndef PRODUCT
1912 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1913 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1914 }
1915 #endif // PRODUCT
1916
1917
1918 // Printing
1919
1920 #ifndef PRODUCT
1921
1922 void Method::print_on(outputStream* st) const {
1923 ResourceMark rm;
1924 assert(is_method(), "must be method");
1925 st->print_cr("%s", internal_name());
1926 // get the effect of PrintOopAddress, always, for methods:
1927 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this);
1928 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
1929 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants());
1930 constants()->print_value_on(st); st->cr();
1931 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
1932 st->print (" - name: "); name()->print_value_on(st); st->cr();
1933 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
1934 st->print_cr(" - max stack: %d", max_stack());
1935 st->print_cr(" - max locals: %d", max_locals());
1936 st->print_cr(" - size of params: %d", size_of_parameters());
1937 st->print_cr(" - method size: %d", method_size());
1938 if (intrinsic_id() != vmIntrinsics::_none)
1939 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
1940 if (highest_comp_level() != CompLevel_none)
1941 st->print_cr(" - highest level: %d", highest_comp_level());
1942 st->print_cr(" - vtable index: %d", _vtable_index);
1943 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
1944 st->print( " - adapters: ");
1945 AdapterHandlerEntry* a = ((Method*)this)->adapter();
1946 if (a == NULL)
1947 st->print_cr(INTPTR_FORMAT, a);
1948 else
1949 a->print_adapter_on(st);
1950 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
1951 st->print_cr(" - code size: %d", code_size());
1952 if (code_size() != 0) {
1953 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
1954 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
1955 }
1956 if (method_data() != NULL) {
1957 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
1958 }
1959 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
1960 if (checked_exceptions_length() > 0) {
1961 CheckedExceptionElement* table = checked_exceptions_start();
1962 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
1963 if (Verbose) {
1964 for (int i = 0; i < checked_exceptions_length(); i++) {
1965 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
1966 }
1967 }
1968 }
1969 if (has_linenumber_table()) {
1970 u_char* table = compressed_linenumber_table();
1971 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
1972 if (Verbose) {
1973 CompressedLineNumberReadStream stream(table);
1974 while (stream.read_pair()) {
1975 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
1976 }
1977 }
1978 }
1979 st->print_cr(" - localvar length: %d", localvariable_table_length());
1980 if (localvariable_table_length() > 0) {
1981 LocalVariableTableElement* table = localvariable_table_start();
1982 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
1983 if (Verbose) {
1984 for (int i = 0; i < localvariable_table_length(); i++) {
1985 int bci = table[i].start_bci;
1986 int len = table[i].length;
1987 const char* name = constants()->printable_name_at(table[i].name_cp_index);
1988 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
1989 int slot = table[i].slot;
1990 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
1991 }
1992 }
1993 }
1994 if (code() != NULL) {
1995 st->print (" - compiled code: ");
1996 code()->print_value_on(st);
1997 }
1998 if (is_native()) {
1999 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
2000 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
2001 }
2002 }
2003
2004 #endif //PRODUCT
2005
2006 void Method::print_value_on(outputStream* st) const {
2007 assert(is_method(), "must be method");
2008 st->print("%s", internal_name());
2009 print_address_on(st);
2010 st->print(" ");
2011 name()->print_value_on(st);
2012 st->print(" ");
2013 signature()->print_value_on(st);
2014 st->print(" in ");
2015 method_holder()->print_value_on(st);
2016 if (WizardMode) st->print("#%d", _vtable_index);
2017 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2018 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2019 }
2020
2021 #if INCLUDE_SERVICES
2022 // Size Statistics
2023 void Method::collect_statistics(KlassSizeStats *sz) const {
2024 int mysize = sz->count(this);
2025 sz->_method_bytes += mysize;
2026 sz->_method_all_bytes += mysize;
2027 sz->_rw_bytes += mysize;
2028
2029 if (constMethod()) {
2030 constMethod()->collect_statistics(sz);
2031 }
2032 if (method_data()) {
2033 method_data()->collect_statistics(sz);
2034 }
2035 }
2036 #endif // INCLUDE_SERVICES
2037
2038 // Verification
2039
2040 void Method::verify_on(outputStream* st) {
2041 guarantee(is_method(), "object must be method");
2042 guarantee(constants()->is_constantPool(), "should be constant pool");
2043 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2044 MethodData* md = method_data();
2045 guarantee(md == NULL ||
2046 md->is_methodData(), "should be method data");
2047 }