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 #ifdef ASSERT
244 { ResourceMark rm;
245 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
246 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string()));
247 }
248 #endif
249 return bcp - code_base();
250 }
251
252
253 // Return (int)bcx if it appears to be a valid BCI.
254 // Return bci_from((address)bcx) if it appears to be a valid BCP.
255 // Return -1 otherwise.
256 // Used by profiling code, when invalid data is a possibility.
257 // The caller is responsible for validating the Method* itself.
258 int Method::validate_bci_from_bcx(intptr_t bcx) const {
259 // keep bci as -1 if not a valid bci
260 int bci = -1;
261 if (bcx == 0 || (address)bcx == code_base()) {
262 // code_size() may return 0 and we allow 0 here
263 // the method may be native
264 bci = 0;
265 } else if (frame::is_bci(bcx)) {
266 if (bcx < code_size()) {
267 bci = (int)bcx;
268 }
269 } else if (contains((address)bcx)) {
270 bci = (address)bcx - code_base();
271 }
272 // Assert that if we have dodged any asserts, bci is negative.
273 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
274 return bci;
275 }
276
277 address Method::bcp_from(int bci) const {
278 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), err_msg("illegal bci: %d", bci));
279 address bcp = code_base() + bci;
280 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
281 return bcp;
282 }
283
284
285 int Method::size(bool is_native) {
286 // If native, then include pointers for native_function and signature_handler
287 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
288 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
289 return align_object_size(header_size() + extra_words);
290 }
291
292
293 Symbol* Method::klass_name() const {
294 Klass* k = method_holder();
295 assert(k->is_klass(), "must be klass");
296 InstanceKlass* ik = (InstanceKlass*) k;
297 return ik->name();
298 }
299
300
301 // Attempt to return method oop to original state. Clear any pointers
302 // (to objects outside the shared spaces). We won't be able to predict
303 // where they should point in a new JVM. Further initialize some
304 // entries now in order allow them to be write protected later.
305
306 void Method::remove_unshareable_info() {
307 unlink_method();
308 }
309
310
311 bool Method::was_executed_more_than(int n) {
312 // Invocation counter is reset when the Method* is compiled.
313 // If the method has compiled code we therefore assume it has
314 // be excuted more than n times.
315 if (is_accessor() || is_empty_method() || (code() != NULL)) {
316 // interpreter doesn't bump invocation counter of trivial methods
317 // compiler does not bump invocation counter of compiled methods
318 return true;
319 }
320 else if ((method_counters() != NULL &&
321 method_counters()->invocation_counter()->carry()) ||
322 (method_data() != NULL &&
323 method_data()->invocation_counter()->carry())) {
324 // The carry bit is set when the counter overflows and causes
325 // a compilation to occur. We don't know how many times
326 // the counter has been reset, so we simply assume it has
327 // been executed more than n times.
328 return true;
329 } else {
330 return invocation_count() > n;
331 }
332 }
333
334 #ifndef PRODUCT
335 void Method::print_invocation_count() {
336 if (is_static()) tty->print("static ");
337 if (is_final()) tty->print("final ");
338 if (is_synchronized()) tty->print("synchronized ");
339 if (is_native()) tty->print("native ");
340 method_holder()->name()->print_symbol_on(tty);
341 tty->print(".");
342 name()->print_symbol_on(tty);
343 signature()->print_symbol_on(tty);
344
345 if (WizardMode) {
346 // dump the size of the byte codes
347 tty->print(" {%d}", code_size());
348 }
349 tty->cr();
350
351 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
352 tty->print_cr (" invocation_counter: %8d ", invocation_count());
353 tty->print_cr (" backedge_counter: %8d ", backedge_count());
354 if (CountCompiledCalls) {
355 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
356 }
357
358 }
359 #endif
360
361 // Build a MethodData* object to hold information about this method
362 // collected in the interpreter.
363 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
364 // Do not profile method if current thread holds the pending list lock,
365 // which avoids deadlock for acquiring the MethodData_lock.
366 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
367 return;
368 }
369
370 // Grab a lock here to prevent multiple
371 // MethodData*s from being created.
372 MutexLocker ml(MethodData_lock, THREAD);
373 if (method->method_data() == NULL) {
374 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
375 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);
376 method->set_method_data(method_data);
377 if (PrintMethodData && (Verbose || WizardMode)) {
378 ResourceMark rm(THREAD);
379 tty->print("build_interpreter_method_data for ");
380 method->print_name(tty);
381 tty->cr();
382 // At the end of the run, the MDO, full of data, will be dumped.
383 }
384 }
385 }
386
387 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
388 methodHandle mh(m);
389 ClassLoaderData* loader_data = mh->method_holder()->class_loader_data();
390 MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL);
391 if (!mh->init_method_counters(counters)) {
392 MetadataFactory::free_metadata(loader_data, counters);
393 }
394 return mh->method_counters();
395 }
396
397 void Method::cleanup_inline_caches() {
398 // The current system doesn't use inline caches in the interpreter
399 // => nothing to do (keep this method around for future use)
400 }
401
402
403 int Method::extra_stack_words() {
404 // not an inline function, to avoid a header dependency on Interpreter
405 return extra_stack_entries() * Interpreter::stackElementSize;
406 }
407
408
409 void Method::compute_size_of_parameters(Thread *thread) {
410 ArgumentSizeComputer asc(signature());
411 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
412 }
413
414 #ifdef CC_INTERP
415 void Method::set_result_index(BasicType type) {
416 _result_index = Interpreter::BasicType_as_index(type);
417 }
418 #endif
419
420 BasicType Method::result_type() const {
421 ResultTypeFinder rtf(signature());
422 return rtf.type();
423 }
424
425
426 bool Method::is_empty_method() const {
427 return code_size() == 1
428 && *code_base() == Bytecodes::_return;
429 }
430
431
432 bool Method::is_vanilla_constructor() const {
433 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
434 // which only calls the superclass vanilla constructor and possibly does stores of
435 // zero constants to local fields:
436 //
437 // aload_0
438 // invokespecial
439 // indexbyte1
440 // indexbyte2
441 //
442 // followed by an (optional) sequence of:
443 //
444 // aload_0
445 // aconst_null / iconst_0 / fconst_0 / dconst_0
446 // putfield
447 // indexbyte1
448 // indexbyte2
449 //
450 // followed by:
451 //
452 // return
453
454 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
455 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
456 int size = code_size();
457 // Check if size match
458 if (size == 0 || size % 5 != 0) return false;
459 address cb = code_base();
460 int last = size - 1;
461 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
462 // Does not call superclass default constructor
463 return false;
464 }
465 // Check optional sequence
466 for (int i = 4; i < last; i += 5) {
467 if (cb[i] != Bytecodes::_aload_0) return false;
468 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
469 if (cb[i+2] != Bytecodes::_putfield) return false;
470 }
471 return true;
472 }
473
474
475 bool Method::compute_has_loops_flag() {
476 BytecodeStream bcs(this);
477 Bytecodes::Code bc;
478
479 while ((bc = bcs.next()) >= 0) {
480 switch( bc ) {
481 case Bytecodes::_ifeq:
482 case Bytecodes::_ifnull:
483 case Bytecodes::_iflt:
484 case Bytecodes::_ifle:
485 case Bytecodes::_ifne:
486 case Bytecodes::_ifnonnull:
487 case Bytecodes::_ifgt:
488 case Bytecodes::_ifge:
489 case Bytecodes::_if_icmpeq:
490 case Bytecodes::_if_icmpne:
491 case Bytecodes::_if_icmplt:
492 case Bytecodes::_if_icmpgt:
493 case Bytecodes::_if_icmple:
494 case Bytecodes::_if_icmpge:
495 case Bytecodes::_if_acmpeq:
496 case Bytecodes::_if_acmpne:
497 case Bytecodes::_goto:
498 case Bytecodes::_jsr:
499 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
500 break;
501
502 case Bytecodes::_goto_w:
503 case Bytecodes::_jsr_w:
504 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
505 break;
506 }
507 }
508 _access_flags.set_loops_flag_init();
509 return _access_flags.has_loops();
510 }
511
512 bool Method::is_final_method(AccessFlags class_access_flags) const {
513 // or "does_not_require_vtable_entry"
514 // default method or overpass can occur, is not final (reuses vtable entry)
515 // private methods get vtable entries for backward class compatibility.
516 if (is_overpass() || is_default_method()) return false;
517 return is_final() || class_access_flags.is_final();
518 }
519
520 bool Method::is_final_method() const {
521 return is_final_method(method_holder()->access_flags());
522 }
523
524 bool Method::is_default_method() const {
525 if (method_holder() != NULL &&
526 method_holder()->is_interface() &&
527 !is_abstract()) {
528 return true;
529 } else {
530 return false;
531 }
532 }
533
534 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
535 if (is_final_method(class_access_flags)) return true;
536 #ifdef ASSERT
537 ResourceMark rm;
538 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
539 if (class_access_flags.is_interface()) {
540 assert(is_nonv == is_static(), err_msg("is_nonv=%s", name_and_sig_as_C_string()));
541 }
542 #endif
543 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
544 return vtable_index() == nonvirtual_vtable_index;
545 }
546
547 bool Method::can_be_statically_bound() const {
548 return can_be_statically_bound(method_holder()->access_flags());
549 }
550
551 bool Method::is_accessor() const {
552 if (code_size() != 5) return false;
553 if (size_of_parameters() != 1) return false;
554 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
555 if (java_code_at(1) != Bytecodes::_getfield) return false;
556 if (java_code_at(4) != Bytecodes::_areturn &&
557 java_code_at(4) != Bytecodes::_ireturn ) return false;
558 return true;
559 }
560
561 bool Method::is_constant_getter() const {
562 int last_index = code_size() - 1;
563 // Check if the first 1-3 bytecodes are a constant push
564 // and the last bytecode is a return.
565 return (2 <= code_size() && code_size() <= 4 &&
566 Bytecodes::is_const(java_code_at(0)) &&
567 Bytecodes::length_for(java_code_at(0)) == last_index &&
568 Bytecodes::is_return(java_code_at(last_index)));
569 }
570
571 bool Method::is_initializer() const {
572 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
573 }
574
575 bool Method::has_valid_initializer_flags() const {
576 return (is_static() ||
577 method_holder()->major_version() < 51);
578 }
579
580 bool Method::is_static_initializer() const {
581 // For classfiles version 51 or greater, ensure that the clinit method is
582 // static. Non-static methods with the name "<clinit>" are not static
583 // initializers. (older classfiles exempted for backward compatibility)
584 return name() == vmSymbols::class_initializer_name() &&
585 has_valid_initializer_flags();
586 }
587
588
589 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) {
590 int length = this_oop->checked_exceptions_length();
591 if (length == 0) { // common case
592 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
593 } else {
594 methodHandle h_this(THREAD, this_oop);
595 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
596 objArrayHandle mirrors (THREAD, m_oop);
597 for (int i = 0; i < length; i++) {
598 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
599 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
600 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
601 mirrors->obj_at_put(i, k->java_mirror());
602 }
603 return mirrors;
604 }
605 };
606
607
608 int Method::line_number_from_bci(int bci) const {
609 if (bci == SynchronizationEntryBCI) bci = 0;
610 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
611 int best_bci = 0;
612 int best_line = -1;
613
614 if (has_linenumber_table()) {
615 // The line numbers are a short array of 2-tuples [start_pc, line_number].
616 // Not necessarily sorted and not necessarily one-to-one.
617 CompressedLineNumberReadStream stream(compressed_linenumber_table());
618 while (stream.read_pair()) {
619 if (stream.bci() == bci) {
620 // perfect match
621 return stream.line();
622 } else {
623 // update best_bci/line
624 if (stream.bci() < bci && stream.bci() >= best_bci) {
625 best_bci = stream.bci();
626 best_line = stream.line();
627 }
628 }
629 }
630 }
631 return best_line;
632 }
633
634
635 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
636 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
637 Thread *thread = Thread::current();
638 Symbol* klass_name = constants()->klass_name_at(klass_index);
639 Handle loader(thread, method_holder()->class_loader());
640 Handle prot (thread, method_holder()->protection_domain());
641 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
642 } else {
643 return true;
644 }
645 }
646
647
648 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
649 int klass_index = constants()->klass_ref_index_at(refinfo_index);
650 if (must_be_resolved) {
651 // Make sure klass is resolved in constantpool.
652 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
653 }
654 return is_klass_loaded_by_klass_index(klass_index);
655 }
656
657
658 void Method::set_native_function(address function, bool post_event_flag) {
659 assert(function != NULL, "use clear_native_function to unregister natives");
660 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
661 address* native_function = native_function_addr();
662
663 // We can see racers trying to place the same native function into place. Once
664 // is plenty.
665 address current = *native_function;
666 if (current == function) return;
667 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
668 function != NULL) {
669 // native_method_throw_unsatisfied_link_error_entry() should only
670 // be passed when post_event_flag is false.
671 assert(function !=
672 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
673 "post_event_flag mis-match");
674
675 // post the bind event, and possible change the bind function
676 JvmtiExport::post_native_method_bind(this, &function);
677 }
678 *native_function = function;
679 // This function can be called more than once. We must make sure that we always
680 // use the latest registered method -> check if a stub already has been generated.
681 // If so, we have to make it not_entrant.
682 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
683 if (nm != NULL) {
684 nm->make_not_entrant();
685 }
686 }
687
688
689 bool Method::has_native_function() const {
690 if (is_method_handle_intrinsic())
691 return false; // special-cased in SharedRuntime::generate_native_wrapper
692 address func = native_function();
693 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
694 }
695
696
697 void Method::clear_native_function() {
698 // Note: is_method_handle_intrinsic() is allowed here.
699 set_native_function(
700 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
701 !native_bind_event_is_interesting);
702 clear_code();
703 }
704
705 address Method::critical_native_function() {
706 methodHandle mh(this);
707 return NativeLookup::lookup_critical_entry(mh);
708 }
709
710
711 void Method::set_signature_handler(address handler) {
712 address* signature_handler = signature_handler_addr();
713 *signature_handler = handler;
714 }
715
716
717 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
718 if (PrintCompilation && report) {
719 ttyLocker ttyl;
720 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
721 if (comp_level == CompLevel_all) {
722 tty->print("all levels ");
723 } else {
724 tty->print("levels ");
725 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
726 tty->print("%d ", i);
727 }
728 }
729 this->print_short_name(tty);
730 int size = this->code_size();
731 if (size > 0) {
732 tty->print(" (%d bytes)", size);
733 }
734 if (reason != NULL) {
735 tty->print(" %s", reason);
736 }
737 tty->cr();
738 }
739 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
740 ttyLocker ttyl;
741 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
742 os::current_thread_id(), is_osr, comp_level);
743 if (reason != NULL) {
744 xtty->print(" reason=\'%s\'", reason);
745 }
746 xtty->method(this);
747 xtty->stamp();
748 xtty->end_elem();
749 }
750 }
751
752 bool Method::is_always_compilable() const {
753 // Generated adapters must be compiled
754 if (is_method_handle_intrinsic() && is_synthetic()) {
755 assert(!is_not_c1_compilable(), "sanity check");
756 assert(!is_not_c2_compilable(), "sanity check");
757 return true;
758 }
759
760 return false;
761 }
762
763 bool Method::is_not_compilable(int comp_level) const {
764 if (number_of_breakpoints() > 0)
765 return true;
766 if (is_always_compilable())
767 return false;
768 if (comp_level == CompLevel_any)
769 return is_not_c1_compilable() || is_not_c2_compilable();
770 if (is_c1_compile(comp_level))
771 return is_not_c1_compilable();
772 if (is_c2_compile(comp_level))
773 return is_not_c2_compilable();
774 return false;
775 }
776
777 // call this when compiler finds that this method is not compilable
778 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
779 if (is_always_compilable()) {
780 // Don't mark a method which should be always compilable
781 return;
782 }
783 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
784 if (comp_level == CompLevel_all) {
785 set_not_c1_compilable();
786 set_not_c2_compilable();
787 } else {
788 if (is_c1_compile(comp_level))
789 set_not_c1_compilable();
790 if (is_c2_compile(comp_level))
791 set_not_c2_compilable();
792 }
793 CompilationPolicy::policy()->disable_compilation(this);
794 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
795 }
796
797 bool Method::is_not_osr_compilable(int comp_level) const {
798 if (is_not_compilable(comp_level))
799 return true;
800 if (comp_level == CompLevel_any)
801 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
802 if (is_c1_compile(comp_level))
803 return is_not_c1_osr_compilable();
804 if (is_c2_compile(comp_level))
805 return is_not_c2_osr_compilable();
806 return false;
807 }
808
809 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
810 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
811 if (comp_level == CompLevel_all) {
812 set_not_c1_osr_compilable();
813 set_not_c2_osr_compilable();
814 } else {
815 if (is_c1_compile(comp_level))
816 set_not_c1_osr_compilable();
817 if (is_c2_compile(comp_level))
818 set_not_c2_osr_compilable();
819 }
820 CompilationPolicy::policy()->disable_compilation(this);
821 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
822 }
823
824 // Revert to using the interpreter and clear out the nmethod
825 void Method::clear_code() {
826
827 // this may be NULL if c2i adapters have not been made yet
828 // Only should happen at allocate time.
829 if (_adapter == NULL) {
830 _from_compiled_entry = NULL;
831 } else {
832 _from_compiled_entry = _adapter->get_c2i_entry();
833 }
834 OrderAccess::storestore();
835 _from_interpreted_entry = _i2i_entry;
836 OrderAccess::storestore();
837 _code = NULL;
838 }
839
840 // Called by class data sharing to remove any entry points (which are not shared)
841 void Method::unlink_method() {
842 _code = NULL;
843 _i2i_entry = NULL;
844 _from_interpreted_entry = NULL;
845 if (is_native()) {
846 *native_function_addr() = NULL;
847 set_signature_handler(NULL);
848 }
849 NOT_PRODUCT(set_compiled_invocation_count(0);)
850 _adapter = NULL;
851 _from_compiled_entry = NULL;
852
853 // In case of DumpSharedSpaces, _method_data should always be NULL.
854 //
855 // During runtime (!DumpSharedSpaces), when we are cleaning a
856 // shared class that failed to load, this->link_method() may
857 // have already been called (before an exception happened), so
858 // this->_method_data may not be NULL.
859 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?");
860
861 set_method_data(NULL);
862 clear_method_counters();
863 }
864
865 // Called when the method_holder is getting linked. Setup entrypoints so the method
866 // is ready to be called from interpreter, compiler, and vtables.
867 void Method::link_method(methodHandle h_method, TRAPS) {
868 // If the code cache is full, we may reenter this function for the
869 // leftover methods that weren't linked.
870 if (_i2i_entry != NULL) return;
871
872 assert(_adapter == NULL, "init'd to NULL" );
873 assert( _code == NULL, "nothing compiled yet" );
874
875 // Setup interpreter entrypoint
876 assert(this == h_method(), "wrong h_method()" );
877 address entry = Interpreter::entry_for_method(h_method);
878 assert(entry != NULL, "interpreter entry must be non-null");
879 // Sets both _i2i_entry and _from_interpreted_entry
880 set_interpreter_entry(entry);
881
882 // Don't overwrite already registered native entries.
883 if (is_native() && !has_native_function()) {
884 set_native_function(
885 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
886 !native_bind_event_is_interesting);
887 }
888
889 // Setup compiler entrypoint. This is made eagerly, so we do not need
890 // special handling of vtables. An alternative is to make adapters more
891 // lazily by calling make_adapter() from from_compiled_entry() for the
892 // normal calls. For vtable calls life gets more complicated. When a
893 // call-site goes mega-morphic we need adapters in all methods which can be
894 // called from the vtable. We need adapters on such methods that get loaded
895 // later. Ditto for mega-morphic itable calls. If this proves to be a
896 // problem we'll make these lazily later.
897 (void) make_adapters(h_method, CHECK);
898
899 // ONLY USE the h_method now as make_adapter may have blocked
900
901 }
902
903 address Method::make_adapters(methodHandle mh, TRAPS) {
904 // Adapters for compiled code are made eagerly here. They are fairly
905 // small (generally < 100 bytes) and quick to make (and cached and shared)
906 // so making them eagerly shouldn't be too expensive.
907 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
908 if (adapter == NULL ) {
909 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
910 }
911
912 mh->set_adapter_entry(adapter);
913 mh->_from_compiled_entry = adapter->get_c2i_entry();
914 return adapter->get_c2i_entry();
915 }
916
917 void Method::restore_unshareable_info(TRAPS) {
918 // Since restore_unshareable_info can be called more than once for a method, don't
919 // redo any work. If this field is restored, there is nothing to do.
920 if (_from_compiled_entry == NULL) {
921 // restore method's vtable by calling a virtual function
922 restore_vtable();
923
924 methodHandle mh(THREAD, this);
925 link_method(mh, CHECK);
926 }
927 }
928
929
930 // The verified_code_entry() must be called when a invoke is resolved
931 // on this method.
932
933 // It returns the compiled code entry point, after asserting not null.
934 // This function is called after potential safepoints so that nmethod
935 // or adapter that it points to is still live and valid.
936 // This function must not hit a safepoint!
937 address Method::verified_code_entry() {
938 debug_only(No_Safepoint_Verifier nsv;)
939 assert(_from_compiled_entry != NULL, "must be set");
940 return _from_compiled_entry;
941 }
942
943 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
944 // (could be racing a deopt).
945 // Not inline to avoid circular ref.
946 bool Method::check_code() const {
947 // cached in a register or local. There's a race on the value of the field.
948 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
949 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
950 }
951
952 // Install compiled code. Instantly it can execute.
953 void Method::set_code(methodHandle mh, nmethod *code) {
954 assert( code, "use clear_code to remove code" );
955 assert( mh->check_code(), "" );
956
957 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
958
959 // These writes must happen in this order, because the interpreter will
960 // directly jump to from_interpreted_entry which jumps to an i2c adapter
961 // which jumps to _from_compiled_entry.
962 mh->_code = code; // Assign before allowing compiled code to exec
963
964 int comp_level = code->comp_level();
965 // In theory there could be a race here. In practice it is unlikely
966 // and not worth worrying about.
967 if (comp_level > mh->highest_comp_level()) {
968 mh->set_highest_comp_level(comp_level);
969 }
970
971 OrderAccess::storestore();
972 #ifdef SHARK
973 mh->_from_interpreted_entry = code->insts_begin();
974 #else //!SHARK
975 mh->_from_compiled_entry = code->verified_entry_point();
976 OrderAccess::storestore();
977 // Instantly compiled code can execute.
978 if (!mh->is_method_handle_intrinsic())
979 mh->_from_interpreted_entry = mh->get_i2c_entry();
980 #endif //!SHARK
981 }
982
983
984 bool Method::is_overridden_in(Klass* k) const {
985 InstanceKlass* ik = InstanceKlass::cast(k);
986
987 if (ik->is_interface()) return false;
988
989 // If method is an interface, we skip it - except if it
990 // is a miranda method
991 if (method_holder()->is_interface()) {
992 // Check that method is not a miranda method
993 if (ik->lookup_method(name(), signature()) == NULL) {
994 // No implementation exist - so miranda method
995 return false;
996 }
997 return true;
998 }
999
1000 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1001 assert(ik->vtable() != NULL, "vtable should exist");
1002 if (!has_vtable_index()) {
1003 return false;
1004 } else {
1005 Method* vt_m = ik->method_at_vtable(vtable_index());
1006 return vt_m != this;
1007 }
1008 }
1009
1010
1011 // give advice about whether this Method* should be cached or not
1012 bool Method::should_not_be_cached() const {
1013 if (is_old()) {
1014 // This method has been redefined. It is either EMCP or obsolete
1015 // and we don't want to cache it because that would pin the method
1016 // down and prevent it from being collectible if and when it
1017 // finishes executing.
1018 return true;
1019 }
1020
1021 // caching this method should be just fine
1022 return false;
1023 }
1024
1025
1026 /**
1027 * Returns true if this is one of the specially treated methods for
1028 * security related stack walks (like Reflection.getCallerClass).
1029 */
1030 bool Method::is_ignored_by_security_stack_walk() const {
1031 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection;
1032
1033 if (intrinsic_id() == vmIntrinsics::_invoke) {
1034 // This is Method.invoke() -- ignore it
1035 return true;
1036 }
1037 if (use_new_reflection &&
1038 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1039 // This is an auxilary frame -- ignore it
1040 return true;
1041 }
1042 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1043 // This is an internal adapter frame for method handles -- ignore it
1044 return true;
1045 }
1046 return false;
1047 }
1048
1049
1050 // Constant pool structure for invoke methods:
1051 enum {
1052 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1053 _imcp_invoke_signature, // utf8: (variable Symbol*)
1054 _imcp_limit
1055 };
1056
1057 // Test if this method is an MH adapter frame generated by Java code.
1058 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1059 bool Method::is_compiled_lambda_form() const {
1060 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1061 }
1062
1063 // Test if this method is an internal MH primitive method.
1064 bool Method::is_method_handle_intrinsic() const {
1065 vmIntrinsics::ID iid = intrinsic_id();
1066 return (MethodHandles::is_signature_polymorphic(iid) &&
1067 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1068 }
1069
1070 bool Method::has_member_arg() const {
1071 vmIntrinsics::ID iid = intrinsic_id();
1072 return (MethodHandles::is_signature_polymorphic(iid) &&
1073 MethodHandles::has_member_arg(iid));
1074 }
1075
1076 // Make an instance of a signature-polymorphic internal MH primitive.
1077 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1078 Symbol* signature,
1079 TRAPS) {
1080 ResourceMark rm;
1081 methodHandle empty;
1082
1083 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1084 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1085 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1086 if (TraceMethodHandles) {
1087 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1088 }
1089
1090 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1091 name->increment_refcount();
1092 signature->increment_refcount();
1093
1094 int cp_length = _imcp_limit;
1095 ClassLoaderData* loader_data = holder->class_loader_data();
1096 constantPoolHandle cp;
1097 {
1098 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1099 cp = constantPoolHandle(THREAD, cp_oop);
1100 }
1101 cp->set_pool_holder(InstanceKlass::cast(holder()));
1102 cp->symbol_at_put(_imcp_invoke_name, name);
1103 cp->symbol_at_put(_imcp_invoke_signature, signature);
1104 cp->set_has_preresolution();
1105
1106 // decide on access bits: public or not?
1107 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1108 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1109 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1110 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1111
1112 methodHandle m;
1113 {
1114 InlineTableSizes sizes;
1115 Method* m_oop = Method::allocate(loader_data, 0,
1116 accessFlags_from(flags_bits), &sizes,
1117 ConstMethod::NORMAL, CHECK_(empty));
1118 m = methodHandle(THREAD, m_oop);
1119 }
1120 m->set_constants(cp());
1121 m->set_name_index(_imcp_invoke_name);
1122 m->set_signature_index(_imcp_invoke_signature);
1123 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1124 assert(m->signature() == signature, "");
1125 #ifdef CC_INTERP
1126 ResultTypeFinder rtf(signature);
1127 m->set_result_index(rtf.type());
1128 #endif
1129 m->compute_size_of_parameters(THREAD);
1130 m->init_intrinsic_id();
1131 assert(m->is_method_handle_intrinsic(), "");
1132 #ifdef ASSERT
1133 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1134 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1135 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1136 #endif //ASSERT
1137
1138 // Finally, set up its entry points.
1139 assert(m->can_be_statically_bound(), "");
1140 m->set_vtable_index(Method::nonvirtual_vtable_index);
1141 m->link_method(m, CHECK_(empty));
1142
1143 if (TraceMethodHandles && (Verbose || WizardMode))
1144 m->print_on(tty);
1145
1146 return m;
1147 }
1148
1149 Klass* Method::check_non_bcp_klass(Klass* klass) {
1150 if (klass != NULL && klass->class_loader() != NULL) {
1151 if (klass->oop_is_objArray())
1152 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1153 return klass;
1154 }
1155 return NULL;
1156 }
1157
1158
1159 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1160 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1161 // Code below does not work for native methods - they should never get rewritten anyway
1162 assert(!m->is_native(), "cannot rewrite native methods");
1163 // Allocate new Method*
1164 AccessFlags flags = m->access_flags();
1165
1166 ConstMethod* cm = m->constMethod();
1167 int checked_exceptions_len = cm->checked_exceptions_length();
1168 int localvariable_len = cm->localvariable_table_length();
1169 int exception_table_len = cm->exception_table_length();
1170 int method_parameters_len = cm->method_parameters_length();
1171 int method_annotations_len = cm->method_annotations_length();
1172 int parameter_annotations_len = cm->parameter_annotations_length();
1173 int type_annotations_len = cm->type_annotations_length();
1174 int default_annotations_len = cm->default_annotations_length();
1175
1176 InlineTableSizes sizes(
1177 localvariable_len,
1178 new_compressed_linenumber_size,
1179 exception_table_len,
1180 checked_exceptions_len,
1181 method_parameters_len,
1182 cm->generic_signature_index(),
1183 method_annotations_len,
1184 parameter_annotations_len,
1185 type_annotations_len,
1186 default_annotations_len,
1187 0);
1188
1189 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1190 Method* newm_oop = Method::allocate(loader_data,
1191 new_code_length,
1192 flags,
1193 &sizes,
1194 m->method_type(),
1195 CHECK_(methodHandle()));
1196 methodHandle newm (THREAD, newm_oop);
1197 int new_method_size = newm->method_size();
1198
1199 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1200 ConstMethod* newcm = newm->constMethod();
1201 int new_const_method_size = newm->constMethod()->size();
1202
1203 memcpy(newm(), m(), sizeof(Method));
1204
1205 // Create shallow copy of ConstMethod.
1206 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1207
1208 // Reset correct method/const method, method size, and parameter info
1209 newm->set_constMethod(newcm);
1210 newm->constMethod()->set_code_size(new_code_length);
1211 newm->constMethod()->set_constMethod_size(new_const_method_size);
1212 newm->set_method_size(new_method_size);
1213 assert(newm->code_size() == new_code_length, "check");
1214 assert(newm->method_parameters_length() == method_parameters_len, "check");
1215 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1216 assert(newm->exception_table_length() == exception_table_len, "check");
1217 assert(newm->localvariable_table_length() == localvariable_len, "check");
1218 // Copy new byte codes
1219 memcpy(newm->code_base(), new_code, new_code_length);
1220 // Copy line number table
1221 if (new_compressed_linenumber_size > 0) {
1222 memcpy(newm->compressed_linenumber_table(),
1223 new_compressed_linenumber_table,
1224 new_compressed_linenumber_size);
1225 }
1226 // Copy method_parameters
1227 if (method_parameters_len > 0) {
1228 memcpy(newm->method_parameters_start(),
1229 m->method_parameters_start(),
1230 method_parameters_len * sizeof(MethodParametersElement));
1231 }
1232 // Copy checked_exceptions
1233 if (checked_exceptions_len > 0) {
1234 memcpy(newm->checked_exceptions_start(),
1235 m->checked_exceptions_start(),
1236 checked_exceptions_len * sizeof(CheckedExceptionElement));
1237 }
1238 // Copy exception table
1239 if (exception_table_len > 0) {
1240 memcpy(newm->exception_table_start(),
1241 m->exception_table_start(),
1242 exception_table_len * sizeof(ExceptionTableElement));
1243 }
1244 // Copy local variable number table
1245 if (localvariable_len > 0) {
1246 memcpy(newm->localvariable_table_start(),
1247 m->localvariable_table_start(),
1248 localvariable_len * sizeof(LocalVariableTableElement));
1249 }
1250 // Copy stackmap table
1251 if (m->has_stackmap_table()) {
1252 int code_attribute_length = m->stackmap_data()->length();
1253 Array<u1>* stackmap_data =
1254 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1255 memcpy((void*)stackmap_data->adr_at(0),
1256 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1257 newm->set_stackmap_data(stackmap_data);
1258 }
1259
1260 // copy annotations over to new method
1261 newcm->copy_annotations_from(cm);
1262 return newm;
1263 }
1264
1265 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1266 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1267 // because we are not loading from core libraries
1268 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1269 // which does not use the class default class loader so we check for its loader here
1270 InstanceKlass* ik = InstanceKlass::cast(holder);
1271 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) {
1272 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1273 }
1274
1275 // see if the klass name is well-known:
1276 Symbol* klass_name = ik->name();
1277 return vmSymbols::find_sid(klass_name);
1278 }
1279
1280 void Method::init_intrinsic_id() {
1281 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1282 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1283 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1284 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1285
1286 // the klass name is well-known:
1287 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1288 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1289
1290 // ditto for method and signature:
1291 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1292 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1293 && name_id == vmSymbols::NO_SID)
1294 return;
1295 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1296 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1297 && sig_id == vmSymbols::NO_SID) return;
1298 jshort flags = access_flags().as_short();
1299
1300 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1301 if (id != vmIntrinsics::_none) {
1302 set_intrinsic_id(id);
1303 return;
1304 }
1305
1306 // A few slightly irregular cases:
1307 switch (klass_id) {
1308 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1309 // Second chance: check in regular Math.
1310 switch (name_id) {
1311 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1312 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1313 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1314 // pretend it is the corresponding method in the non-strict class:
1315 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1316 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1317 break;
1318 }
1319 break;
1320
1321 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1322 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1323 if (!is_native()) break;
1324 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1325 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1326 id = vmIntrinsics::_none;
1327 break;
1328 }
1329
1330 if (id != vmIntrinsics::_none) {
1331 // Set up its iid. It is an alias method.
1332 set_intrinsic_id(id);
1333 return;
1334 }
1335 }
1336
1337 // These two methods are static since a GC may move the Method
1338 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1339 if (THREAD->is_Compiler_thread()) {
1340 // There is nothing useful this routine can do from within the Compile thread.
1341 // Hopefully, the signature contains only well-known classes.
1342 // We could scan for this and return true/false, but the caller won't care.
1343 return false;
1344 }
1345 bool sig_is_loaded = true;
1346 Handle class_loader(THREAD, m->method_holder()->class_loader());
1347 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1348 ResourceMark rm(THREAD);
1349 Symbol* signature = m->signature();
1350 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1351 if (ss.is_object()) {
1352 Symbol* sym = ss.as_symbol(CHECK_(false));
1353 Symbol* name = sym;
1354 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1355 protection_domain, THREAD);
1356 // We are loading classes eagerly. If a ClassNotFoundException or
1357 // a LinkageError was generated, be sure to ignore it.
1358 if (HAS_PENDING_EXCEPTION) {
1359 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1360 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1361 CLEAR_PENDING_EXCEPTION;
1362 } else {
1363 return false;
1364 }
1365 }
1366 if( klass == NULL) { sig_is_loaded = false; }
1367 }
1368 }
1369 return sig_is_loaded;
1370 }
1371
1372 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1373 Handle class_loader(THREAD, m->method_holder()->class_loader());
1374 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1375 ResourceMark rm(THREAD);
1376 Symbol* signature = m->signature();
1377 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1378 if (ss.type() == T_OBJECT) {
1379 Symbol* name = ss.as_symbol_or_null();
1380 if (name == NULL) return true;
1381 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1382 if (klass == NULL) return true;
1383 }
1384 }
1385 return false;
1386 }
1387
1388 // Exposed so field engineers can debug VM
1389 void Method::print_short_name(outputStream* st) {
1390 ResourceMark rm;
1391 #ifdef PRODUCT
1392 st->print(" %s::", method_holder()->external_name());
1393 #else
1394 st->print(" %s::", method_holder()->internal_name());
1395 #endif
1396 name()->print_symbol_on(st);
1397 if (WizardMode) signature()->print_symbol_on(st);
1398 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1399 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1400 }
1401
1402 // Comparer for sorting an object array containing
1403 // Method*s.
1404 static int method_comparator(Method* a, Method* b) {
1405 return a->name()->fast_compare(b->name());
1406 }
1407
1408 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1409 // default_methods also uses this without the ordering for fast find_method
1410 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1411 int length = methods->length();
1412 if (length > 1) {
1413 {
1414 No_Safepoint_Verifier nsv;
1415 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1416 }
1417 // Reset method ordering
1418 if (set_idnums) {
1419 for (int i = 0; i < length; i++) {
1420 Method* m = methods->at(i);
1421 m->set_method_idnum(i);
1422 }
1423 }
1424 }
1425 }
1426
1427 //-----------------------------------------------------------------------------------
1428 // Non-product code unless JVM/TI needs it
1429
1430 #if !defined(PRODUCT) || INCLUDE_JVMTI
1431 class SignatureTypePrinter : public SignatureTypeNames {
1432 private:
1433 outputStream* _st;
1434 bool _use_separator;
1435
1436 void type_name(const char* name) {
1437 if (_use_separator) _st->print(", ");
1438 _st->print("%s", name);
1439 _use_separator = true;
1440 }
1441
1442 public:
1443 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1444 _st = st;
1445 _use_separator = false;
1446 }
1447
1448 void print_parameters() { _use_separator = false; iterate_parameters(); }
1449 void print_returntype() { _use_separator = false; iterate_returntype(); }
1450 };
1451
1452
1453 void Method::print_name(outputStream* st) {
1454 Thread *thread = Thread::current();
1455 ResourceMark rm(thread);
1456 SignatureTypePrinter sig(signature(), st);
1457 st->print("%s ", is_static() ? "static" : "virtual");
1458 sig.print_returntype();
1459 st->print(" %s.", method_holder()->internal_name());
1460 name()->print_symbol_on(st);
1461 st->print("(");
1462 sig.print_parameters();
1463 st->print(")");
1464 }
1465 #endif // !PRODUCT || INCLUDE_JVMTI
1466
1467
1468 //-----------------------------------------------------------------------------------
1469 // Non-product code
1470
1471 #ifndef PRODUCT
1472 void Method::print_codes_on(outputStream* st) const {
1473 print_codes_on(0, code_size(), st);
1474 }
1475
1476 void Method::print_codes_on(int from, int to, outputStream* st) const {
1477 Thread *thread = Thread::current();
1478 ResourceMark rm(thread);
1479 methodHandle mh (thread, (Method*)this);
1480 BytecodeStream s(mh);
1481 s.set_interval(from, to);
1482 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1483 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1484 }
1485 #endif // not PRODUCT
1486
1487
1488 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1489 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1490 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1491 // as end-of-stream terminator.
1492
1493 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1494 // bci and line number does not compress into single byte.
1495 // Write out escape character and use regular compression for bci and line number.
1496 write_byte((jubyte)0xFF);
1497 write_signed_int(bci_delta);
1498 write_signed_int(line_delta);
1499 }
1500
1501 // See comment in method.hpp which explains why this exists.
1502 #if defined(_M_AMD64) && _MSC_VER >= 1400
1503 #pragma optimize("", off)
1504 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1505 write_pair_inline(bci, line);
1506 }
1507 #pragma optimize("", on)
1508 #endif
1509
1510 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1511 _bci = 0;
1512 _line = 0;
1513 };
1514
1515
1516 bool CompressedLineNumberReadStream::read_pair() {
1517 jubyte next = read_byte();
1518 // Check for terminator
1519 if (next == 0) return false;
1520 if (next == 0xFF) {
1521 // Escape character, regular compression used
1522 _bci += read_signed_int();
1523 _line += read_signed_int();
1524 } else {
1525 // Single byte compression used
1526 _bci += next >> 3;
1527 _line += next & 0x7;
1528 }
1529 return true;
1530 }
1531
1532
1533 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1534 BreakpointInfo* bp = method_holder()->breakpoints();
1535 for (; bp != NULL; bp = bp->next()) {
1536 if (bp->match(this, bci)) {
1537 return bp->orig_bytecode();
1538 }
1539 }
1540 {
1541 ResourceMark rm;
1542 fatal(err_msg("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci));
1543 }
1544 return Bytecodes::_shouldnotreachhere;
1545 }
1546
1547 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1548 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1549 BreakpointInfo* bp = method_holder()->breakpoints();
1550 for (; bp != NULL; bp = bp->next()) {
1551 if (bp->match(this, bci)) {
1552 bp->set_orig_bytecode(code);
1553 // and continue, in case there is more than one
1554 }
1555 }
1556 }
1557
1558 void Method::set_breakpoint(int bci) {
1559 InstanceKlass* ik = method_holder();
1560 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1561 bp->set_next(ik->breakpoints());
1562 ik->set_breakpoints(bp);
1563 // do this last:
1564 bp->set(this);
1565 }
1566
1567 static void clear_matches(Method* m, int bci) {
1568 InstanceKlass* ik = m->method_holder();
1569 BreakpointInfo* prev_bp = NULL;
1570 BreakpointInfo* next_bp;
1571 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1572 next_bp = bp->next();
1573 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1574 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1575 // do this first:
1576 bp->clear(m);
1577 // unhook it
1578 if (prev_bp != NULL)
1579 prev_bp->set_next(next_bp);
1580 else
1581 ik->set_breakpoints(next_bp);
1582 delete bp;
1583 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1584 // at same location. So we have multiple matching (method_index and bci)
1585 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1586 // breakpoint for clear_breakpoint request and keep all other method versions
1587 // BreakpointInfo for future clear_breakpoint request.
1588 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1589 // which is being called when class is unloaded. We delete all the Breakpoint
1590 // information for all versions of method. We may not correctly restore the original
1591 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1592 // so these methods won't be used anymore.
1593 if (bci >= 0) {
1594 break;
1595 }
1596 } else {
1597 // This one is a keeper.
1598 prev_bp = bp;
1599 }
1600 }
1601 }
1602
1603 void Method::clear_breakpoint(int bci) {
1604 assert(bci >= 0, "");
1605 clear_matches(this, bci);
1606 }
1607
1608 void Method::clear_all_breakpoints() {
1609 clear_matches(this, -1);
1610 }
1611
1612
1613 int Method::invocation_count() {
1614 MethodCounters *mcs = method_counters();
1615 if (TieredCompilation) {
1616 MethodData* const mdo = method_data();
1617 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1618 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1619 return InvocationCounter::count_limit;
1620 } else {
1621 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1622 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1623 }
1624 } else {
1625 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1626 }
1627 }
1628
1629 int Method::backedge_count() {
1630 MethodCounters *mcs = method_counters();
1631 if (TieredCompilation) {
1632 MethodData* const mdo = method_data();
1633 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1634 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1635 return InvocationCounter::count_limit;
1636 } else {
1637 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1638 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1639 }
1640 } else {
1641 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1642 }
1643 }
1644
1645 int Method::highest_comp_level() const {
1646 const MethodCounters* mcs = method_counters();
1647 if (mcs != NULL) {
1648 return mcs->highest_comp_level();
1649 } else {
1650 return CompLevel_none;
1651 }
1652 }
1653
1654 int Method::highest_osr_comp_level() const {
1655 const MethodCounters* mcs = method_counters();
1656 if (mcs != NULL) {
1657 return mcs->highest_osr_comp_level();
1658 } else {
1659 return CompLevel_none;
1660 }
1661 }
1662
1663 void Method::set_highest_comp_level(int level) {
1664 MethodCounters* mcs = method_counters();
1665 if (mcs != NULL) {
1666 mcs->set_highest_comp_level(level);
1667 }
1668 }
1669
1670 void Method::set_highest_osr_comp_level(int level) {
1671 MethodCounters* mcs = method_counters();
1672 if (mcs != NULL) {
1673 mcs->set_highest_osr_comp_level(level);
1674 }
1675 }
1676
1677 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1678 _bci = bci;
1679 _name_index = m->name_index();
1680 _signature_index = m->signature_index();
1681 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1682 if (_orig_bytecode == Bytecodes::_breakpoint)
1683 _orig_bytecode = m->orig_bytecode_at(_bci);
1684 _next = NULL;
1685 }
1686
1687 void BreakpointInfo::set(Method* method) {
1688 #ifdef ASSERT
1689 {
1690 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1691 if (code == Bytecodes::_breakpoint)
1692 code = method->orig_bytecode_at(_bci);
1693 assert(orig_bytecode() == code, "original bytecode must be the same");
1694 }
1695 #endif
1696 Thread *thread = Thread::current();
1697 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1698 method->incr_number_of_breakpoints(thread);
1699 SystemDictionary::notice_modification();
1700 {
1701 // Deoptimize all dependents on this method
1702 HandleMark hm(thread);
1703 methodHandle mh(thread, method);
1704 Universe::flush_dependents_on_method(mh);
1705 }
1706 }
1707
1708 void BreakpointInfo::clear(Method* method) {
1709 *method->bcp_from(_bci) = orig_bytecode();
1710 assert(method->number_of_breakpoints() > 0, "must not go negative");
1711 method->decr_number_of_breakpoints(Thread::current());
1712 }
1713
1714 // jmethodID handling
1715
1716 // This is a block allocating object, sort of like JNIHandleBlock, only a
1717 // lot simpler. There aren't many of these, they aren't long, they are rarely
1718 // deleted and so we can do some suboptimal things.
1719 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1720 // never get rid of it.
1721 // It would be nice to be able to parameterize the number of methods for
1722 // the null_class_loader but then we'd have to turn this and ClassLoaderData
1723 // into templates.
1724
1725 // I feel like this brain dead class should exist somewhere in the STL
1726
1727 class JNIMethodBlock : public CHeapObj<mtClass> {
1728 enum { number_of_methods = 8 };
1729
1730 Method* _methods[number_of_methods];
1731 int _top;
1732 JNIMethodBlock* _next;
1733 public:
1734 static Method* const _free_method;
1735
1736 JNIMethodBlock() : _next(NULL), _top(0) {
1737 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method;
1738 }
1739
1740 Method** add_method(Method* m) {
1741 if (_top < number_of_methods) {
1742 // top points to the next free entry.
1743 int i = _top;
1744 _methods[i] = m;
1745 _top++;
1746 return &_methods[i];
1747 } else if (_top == number_of_methods) {
1748 // if the next free entry ran off the block see if there's a free entry
1749 for (int i = 0; i< number_of_methods; i++) {
1750 if (_methods[i] == _free_method) {
1751 _methods[i] = m;
1752 return &_methods[i];
1753 }
1754 }
1755 // Only check each block once for frees. They're very unlikely.
1756 // Increment top past the end of the block.
1757 _top++;
1758 }
1759 // need to allocate a next block.
1760 if (_next == NULL) {
1761 _next = new JNIMethodBlock();
1762 }
1763 return _next->add_method(m);
1764 }
1765
1766 bool contains(Method** m) {
1767 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1768 for (int i = 0; i< number_of_methods; i++) {
1769 if (&(b->_methods[i]) == m) {
1770 return true;
1771 }
1772 }
1773 }
1774 return false; // not found
1775 }
1776
1777 // Doesn't really destroy it, just marks it as free so it can be reused.
1778 void destroy_method(Method** m) {
1779 #ifdef ASSERT
1780 assert(contains(m), "should be a methodID");
1781 #endif // ASSERT
1782 *m = _free_method;
1783 }
1784
1785 // During class unloading the methods are cleared, which is different
1786 // than freed.
1787 void clear_all_methods() {
1788 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1789 for (int i = 0; i< number_of_methods; i++) {
1790 _methods[i] = NULL;
1791 }
1792 }
1793 }
1794 #ifndef PRODUCT
1795 int count_methods() {
1796 // count all allocated methods
1797 int count = 0;
1798 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1799 for (int i = 0; i< number_of_methods; i++) {
1800 if (_methods[i] != _free_method) count++;
1801 }
1802 }
1803 return count;
1804 }
1805 #endif // PRODUCT
1806 };
1807
1808 // Something that can't be mistaken for an address or a markOop
1809 Method* const JNIMethodBlock::_free_method = (Method*)55;
1810
1811 // Add a method id to the jmethod_ids
1812 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
1813 ClassLoaderData* cld = loader_data;
1814
1815 if (!SafepointSynchronize::is_at_safepoint()) {
1816 // Have to add jmethod_ids() to class loader data thread-safely.
1817 // Also have to add the method to the list safely, which the cld lock
1818 // protects as well.
1819 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1820 if (cld->jmethod_ids() == NULL) {
1821 cld->set_jmethod_ids(new JNIMethodBlock());
1822 }
1823 // jmethodID is a pointer to Method*
1824 return (jmethodID)cld->jmethod_ids()->add_method(m);
1825 } else {
1826 // At safepoint, we are single threaded and can set this.
1827 if (cld->jmethod_ids() == NULL) {
1828 cld->set_jmethod_ids(new JNIMethodBlock());
1829 }
1830 // jmethodID is a pointer to Method*
1831 return (jmethodID)cld->jmethod_ids()->add_method(m);
1832 }
1833 }
1834
1835 // Mark a jmethodID as free. This is called when there is a data race in
1836 // InstanceKlass while creating the jmethodID cache.
1837 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
1838 ClassLoaderData* cld = loader_data;
1839 Method** ptr = (Method**)m;
1840 assert(cld->jmethod_ids() != NULL, "should have method handles");
1841 cld->jmethod_ids()->destroy_method(ptr);
1842 }
1843
1844 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
1845 // Can't assert the method_holder is the same because the new method has the
1846 // scratch method holder.
1847 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
1848 == new_method->method_holder()->class_loader(),
1849 "changing to a different class loader");
1850 // Just change the method in place, jmethodID pointer doesn't change.
1851 *((Method**)jmid) = new_method;
1852 }
1853
1854 bool Method::is_method_id(jmethodID mid) {
1855 Method* m = resolve_jmethod_id(mid);
1856 assert(m != NULL, "should be called with non-null method");
1857 InstanceKlass* ik = m->method_holder();
1858 ClassLoaderData* cld = ik->class_loader_data();
1859 if (cld->jmethod_ids() == NULL) return false;
1860 return (cld->jmethod_ids()->contains((Method**)mid));
1861 }
1862
1863 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
1864 if (mid == NULL) return NULL;
1865 Method* o = resolve_jmethod_id(mid);
1866 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
1867 return NULL;
1868 }
1869 return o;
1870 };
1871
1872 void Method::set_on_stack(const bool value) {
1873 // Set both the method itself and its constant pool. The constant pool
1874 // on stack means some method referring to it is also on the stack.
1875 constants()->set_on_stack(value);
1876
1877 bool succeeded = _access_flags.set_on_stack(value);
1878 if (value && succeeded) {
1879 MetadataOnStackMark::record(this, Thread::current());
1880 }
1881 }
1882
1883 // Called when the class loader is unloaded to make all methods weak.
1884 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1885 loader_data->jmethod_ids()->clear_all_methods();
1886 }
1887
1888 bool Method::has_method_vptr(const void* ptr) {
1889 Method m;
1890 // This assumes that the vtbl pointer is the first word of a C++ object.
1891 // This assumption is also in universe.cpp patch_klass_vtble
1892 void* vtbl2 = dereference_vptr((const void*)&m);
1893 void* this_vtbl = dereference_vptr(ptr);
1894 return vtbl2 == this_vtbl;
1895 }
1896
1897 // Check that this pointer is valid by checking that the vtbl pointer matches
1898 bool Method::is_valid_method() const {
1899 if (this == NULL) {
1900 return false;
1901 } else if (!is_metaspace_object()) {
1902 return false;
1903 } else {
1904 return has_method_vptr((const void*)this);
1905 }
1906 }
1907
1908 #ifndef PRODUCT
1909 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1910 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1911 }
1912 #endif // PRODUCT
1913
1914
1915 // Printing
1916
1917 #ifndef PRODUCT
1918
1919 void Method::print_on(outputStream* st) const {
1920 ResourceMark rm;
1921 assert(is_method(), "must be method");
1922 st->print_cr("%s", internal_name());
1923 // get the effect of PrintOopAddress, always, for methods:
1924 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this);
1925 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
1926 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants());
1927 constants()->print_value_on(st); st->cr();
1928 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
1929 st->print (" - name: "); name()->print_value_on(st); st->cr();
1930 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
1931 st->print_cr(" - max stack: %d", max_stack());
1932 st->print_cr(" - max locals: %d", max_locals());
1933 st->print_cr(" - size of params: %d", size_of_parameters());
1934 st->print_cr(" - method size: %d", method_size());
1935 if (intrinsic_id() != vmIntrinsics::_none)
1936 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
1937 if (highest_comp_level() != CompLevel_none)
1938 st->print_cr(" - highest level: %d", highest_comp_level());
1939 st->print_cr(" - vtable index: %d", _vtable_index);
1940 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
1941 st->print( " - adapters: ");
1942 AdapterHandlerEntry* a = ((Method*)this)->adapter();
1943 if (a == NULL)
1944 st->print_cr(INTPTR_FORMAT, a);
1945 else
1946 a->print_adapter_on(st);
1947 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
1948 st->print_cr(" - code size: %d", code_size());
1949 if (code_size() != 0) {
1950 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
1951 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
1952 }
1953 if (method_data() != NULL) {
1954 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
1955 }
1956 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
1957 if (checked_exceptions_length() > 0) {
1958 CheckedExceptionElement* table = checked_exceptions_start();
1959 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
1960 if (Verbose) {
1961 for (int i = 0; i < checked_exceptions_length(); i++) {
1962 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
1963 }
1964 }
1965 }
1966 if (has_linenumber_table()) {
1967 u_char* table = compressed_linenumber_table();
1968 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
1969 if (Verbose) {
1970 CompressedLineNumberReadStream stream(table);
1971 while (stream.read_pair()) {
1972 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
1973 }
1974 }
1975 }
1976 st->print_cr(" - localvar length: %d", localvariable_table_length());
1977 if (localvariable_table_length() > 0) {
1978 LocalVariableTableElement* table = localvariable_table_start();
1979 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
1980 if (Verbose) {
1981 for (int i = 0; i < localvariable_table_length(); i++) {
1982 int bci = table[i].start_bci;
1983 int len = table[i].length;
1984 const char* name = constants()->printable_name_at(table[i].name_cp_index);
1985 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
1986 int slot = table[i].slot;
1987 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
1988 }
1989 }
1990 }
1991 if (code() != NULL) {
1992 st->print (" - compiled code: ");
1993 code()->print_value_on(st);
1994 }
1995 if (is_native()) {
1996 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
1997 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
1998 }
1999 }
2000
2001 #endif //PRODUCT
2002
2003 void Method::print_value_on(outputStream* st) const {
2004 assert(is_method(), "must be method");
2005 st->print("%s", internal_name());
2006 print_address_on(st);
2007 st->print(" ");
2008 name()->print_value_on(st);
2009 st->print(" ");
2010 signature()->print_value_on(st);
2011 st->print(" in ");
2012 method_holder()->print_value_on(st);
2013 if (WizardMode) st->print("#%d", _vtable_index);
2014 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2015 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2016 }
2017
2018 #if INCLUDE_SERVICES
2019 // Size Statistics
2020 void Method::collect_statistics(KlassSizeStats *sz) const {
2021 int mysize = sz->count(this);
2022 sz->_method_bytes += mysize;
2023 sz->_method_all_bytes += mysize;
2024 sz->_rw_bytes += mysize;
2025
2026 if (constMethod()) {
2027 constMethod()->collect_statistics(sz);
2028 }
2029 if (method_data()) {
2030 method_data()->collect_statistics(sz);
2031 }
2032 }
2033 #endif // INCLUDE_SERVICES
2034
2035 // Verification
2036
2037 void Method::verify_on(outputStream* st) {
2038 guarantee(is_method(), "object must be method");
2039 guarantee(constants()->is_constantPool(), "should be constant pool");
2040 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2041 MethodData* md = method_data();
2042 guarantee(md == NULL ||
2043 md->is_methodData(), "should be method data");
2044 }