1 /*
2 * Copyright (c) 1997, 2016, 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 set_intrinsic_id(vmIntrinsics::_none);
88 set_jfr_towrite(false);
89 set_force_inline(false);
90 set_hidden(false);
91 set_dont_inline(false);
92 set_has_injected_profile(false);
93 set_method_data(NULL);
94 clear_method_counters();
95 set_vtable_index(Method::garbage_vtable_index);
96
97 // Fix and bury in Method*
98 set_interpreter_entry(NULL); // sets i2i entry and from_int
99 set_adapter_entry(NULL);
100 clear_code(); // from_c/from_i get set to c2i/i2i
101
102 if (access_flags.is_native()) {
103 clear_native_function();
104 set_signature_handler(NULL);
105 }
106
107 NOT_PRODUCT(set_compiled_invocation_count(0);)
108 }
109
110 // Release Method*. The nmethod will be gone when we get here because
111 // we've walked the code cache.
112 void Method::deallocate_contents(ClassLoaderData* loader_data) {
113 clear_jmethod_id(loader_data);
114 MetadataFactory::free_metadata(loader_data, constMethod());
115 set_constMethod(NULL);
116 MetadataFactory::free_metadata(loader_data, method_data());
117 set_method_data(NULL);
118 MetadataFactory::free_metadata(loader_data, method_counters());
119 clear_method_counters();
120 // The nmethod will be gone when we get here.
121 if (code() != NULL) _code = NULL;
122 }
123
124 address Method::get_i2c_entry() {
125 assert(_adapter != NULL, "must have");
126 return _adapter->get_i2c_entry();
127 }
128
129 address Method::get_c2i_entry() {
130 assert(_adapter != NULL, "must have");
131 return _adapter->get_c2i_entry();
132 }
133
134 address Method::get_c2i_unverified_entry() {
135 assert(_adapter != NULL, "must have");
136 return _adapter->get_c2i_unverified_entry();
137 }
138
139 char* Method::name_and_sig_as_C_string() const {
140 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
141 }
142
143 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
144 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
145 }
146
147 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
148 const char* klass_name = klass->external_name();
149 int klass_name_len = (int)strlen(klass_name);
150 int method_name_len = method_name->utf8_length();
151 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
152 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
153 strcpy(dest, klass_name);
154 dest[klass_name_len] = '.';
155 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
156 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
157 dest[len] = 0;
158 return dest;
159 }
160
161 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
162 Symbol* klass_name = klass->name();
163 klass_name->as_klass_external_name(buf, size);
164 int len = (int)strlen(buf);
165
166 if (len < size - 1) {
167 buf[len++] = '.';
168
169 method_name->as_C_string(&(buf[len]), size - len);
170 len = (int)strlen(buf);
171
172 signature->as_C_string(&(buf[len]), size - len);
173 }
174
175 return buf;
176 }
177
178 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) {
179 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
180 // access exception table
181 ExceptionTable table(mh());
182 int length = table.length();
183 // iterate through all entries sequentially
184 constantPoolHandle pool(THREAD, mh->constants());
185 for (int i = 0; i < length; i ++) {
186 //reacquire the table in case a GC happened
187 ExceptionTable table(mh());
188 int beg_bci = table.start_pc(i);
189 int end_bci = table.end_pc(i);
190 assert(beg_bci <= end_bci, "inconsistent exception table");
191 if (beg_bci <= throw_bci && throw_bci < end_bci) {
192 // exception handler bci range covers throw_bci => investigate further
193 int handler_bci = table.handler_pc(i);
194 int klass_index = table.catch_type_index(i);
195 if (klass_index == 0) {
196 return handler_bci;
197 } else if (ex_klass.is_null()) {
198 return handler_bci;
199 } else {
200 // we know the exception class => get the constraint class
201 // this may require loading of the constraint class; if verification
202 // fails or some other exception occurs, return handler_bci
203 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
204 KlassHandle klass = KlassHandle(THREAD, k);
205 assert(klass.not_null(), "klass not loaded");
206 if (ex_klass->is_subtype_of(klass())) {
207 return handler_bci;
208 }
209 }
210 }
211 }
212
213 return -1;
214 }
215
216 void Method::mask_for(int bci, InterpreterOopMap* mask) {
217
218 Thread* myThread = Thread::current();
219 methodHandle h_this(myThread, this);
220 #ifdef ASSERT
221 bool has_capability = myThread->is_VM_thread() ||
222 myThread->is_ConcurrentGC_thread() ||
223 myThread->is_GC_task_thread();
224
225 if (!has_capability) {
226 if (!VerifyStack && !VerifyLastFrame) {
227 // verify stack calls this outside VM thread
228 warning("oopmap should only be accessed by the "
229 "VM, GC task or CMS threads (or during debugging)");
230 InterpreterOopMap local_mask;
231 method_holder()->mask_for(h_this, bci, &local_mask);
232 local_mask.print();
233 }
234 }
235 #endif
236 method_holder()->mask_for(h_this, bci, mask);
237 return;
238 }
239
240
241 int Method::bci_from(address bcp) const {
242 #ifdef ASSERT
243 { ResourceMark rm;
244 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
245 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string()));
246 }
247 #endif
248 return bcp - code_base();
249 }
250
251
252 // Return (int)bcx if it appears to be a valid BCI.
253 // Return bci_from((address)bcx) if it appears to be a valid BCP.
254 // Return -1 otherwise.
255 // Used by profiling code, when invalid data is a possibility.
256 // The caller is responsible for validating the Method* itself.
257 int Method::validate_bci_from_bcx(intptr_t bcx) const {
258 // keep bci as -1 if not a valid bci
259 int bci = -1;
260 if (bcx == 0 || (address)bcx == code_base()) {
261 // code_size() may return 0 and we allow 0 here
262 // the method may be native
263 bci = 0;
264 } else if (frame::is_bci(bcx)) {
265 if (bcx < code_size()) {
266 bci = (int)bcx;
267 }
268 } else if (contains((address)bcx)) {
269 bci = (address)bcx - code_base();
270 }
271 // Assert that if we have dodged any asserts, bci is negative.
272 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
273 return bci;
274 }
275
276 address Method::bcp_from(int bci) const {
277 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), err_msg("illegal bci: %d", bci));
278 address bcp = code_base() + bci;
279 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
280 return bcp;
281 }
282
283
284 int Method::size(bool is_native) {
285 // If native, then include pointers for native_function and signature_handler
286 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
287 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
288 return align_object_size(header_size() + extra_words);
289 }
290
291
292 Symbol* Method::klass_name() const {
293 Klass* k = method_holder();
294 assert(k->is_klass(), "must be klass");
295 InstanceKlass* ik = (InstanceKlass*) k;
296 return ik->name();
297 }
298
299
300 // Attempt to return method oop to original state. Clear any pointers
301 // (to objects outside the shared spaces). We won't be able to predict
302 // where they should point in a new JVM. Further initialize some
303 // entries now in order allow them to be write protected later.
304
305 void Method::remove_unshareable_info() {
306 unlink_method();
307 }
308
309
310 bool Method::was_executed_more_than(int n) {
311 // Invocation counter is reset when the Method* is compiled.
312 // If the method has compiled code we therefore assume it has
313 // be excuted more than n times.
314 if (is_accessor() || is_empty_method() || (code() != NULL)) {
315 // interpreter doesn't bump invocation counter of trivial methods
316 // compiler does not bump invocation counter of compiled methods
317 return true;
318 }
319 else if ((method_counters() != NULL &&
320 method_counters()->invocation_counter()->carry()) ||
321 (method_data() != NULL &&
322 method_data()->invocation_counter()->carry())) {
323 // The carry bit is set when the counter overflows and causes
324 // a compilation to occur. We don't know how many times
325 // the counter has been reset, so we simply assume it has
326 // been executed more than n times.
327 return true;
328 } else {
329 return invocation_count() > n;
330 }
331 }
332
333 #ifndef PRODUCT
334 void Method::print_invocation_count() {
335 if (is_static()) tty->print("static ");
336 if (is_final()) tty->print("final ");
337 if (is_synchronized()) tty->print("synchronized ");
338 if (is_native()) tty->print("native ");
339 method_holder()->name()->print_symbol_on(tty);
340 tty->print(".");
341 name()->print_symbol_on(tty);
342 signature()->print_symbol_on(tty);
343
344 if (WizardMode) {
345 // dump the size of the byte codes
346 tty->print(" {%d}", code_size());
347 }
348 tty->cr();
349
350 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
351 tty->print_cr (" invocation_counter: %8d ", invocation_count());
352 tty->print_cr (" backedge_counter: %8d ", backedge_count());
353 if (CountCompiledCalls) {
354 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
355 }
356
357 }
358 #endif
359
360 // Build a MethodData* object to hold information about this method
361 // collected in the interpreter.
362 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
363 // Do not profile method if current thread holds the pending list lock,
364 // which avoids deadlock for acquiring the MethodData_lock.
365 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
366 return;
367 }
368
369 // Grab a lock here to prevent multiple
370 // MethodData*s from being created.
371 MutexLocker ml(MethodData_lock, THREAD);
372 if (method->method_data() == NULL) {
373 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
374 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);
375 method->set_method_data(method_data);
376 if (PrintMethodData && (Verbose || WizardMode)) {
377 ResourceMark rm(THREAD);
378 tty->print("build_interpreter_method_data for ");
379 method->print_name(tty);
380 tty->cr();
381 // At the end of the run, the MDO, full of data, will be dumped.
382 }
383 }
384 }
385
386 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
387 methodHandle mh(m);
388 ClassLoaderData* loader_data = mh->method_holder()->class_loader_data();
389 MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL);
390 if (!mh->init_method_counters(counters)) {
391 MetadataFactory::free_metadata(loader_data, counters);
392 }
393 return mh->method_counters();
394 }
395
396 void Method::cleanup_inline_caches() {
397 // The current system doesn't use inline caches in the interpreter
398 // => nothing to do (keep this method around for future use)
399 }
400
401
402 int Method::extra_stack_words() {
403 // not an inline function, to avoid a header dependency on Interpreter
404 return extra_stack_entries() * Interpreter::stackElementSize;
405 }
406
407
408 void Method::compute_size_of_parameters(Thread *thread) {
409 ArgumentSizeComputer asc(signature());
410 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
411 }
412
413 BasicType Method::result_type() const {
414 ResultTypeFinder rtf(signature());
415 return rtf.type();
416 }
417
418
419 bool Method::is_empty_method() const {
420 return code_size() == 1
421 && *code_base() == Bytecodes::_return;
422 }
423
424
425 bool Method::is_vanilla_constructor() const {
426 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
427 // which only calls the superclass vanilla constructor and possibly does stores of
428 // zero constants to local fields:
429 //
430 // aload_0
431 // invokespecial
432 // indexbyte1
433 // indexbyte2
434 //
435 // followed by an (optional) sequence of:
436 //
437 // aload_0
438 // aconst_null / iconst_0 / fconst_0 / dconst_0
439 // putfield
440 // indexbyte1
441 // indexbyte2
442 //
443 // followed by:
444 //
445 // return
446
447 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
448 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
449 int size = code_size();
450 // Check if size match
451 if (size == 0 || size % 5 != 0) return false;
452 address cb = code_base();
453 int last = size - 1;
454 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
455 // Does not call superclass default constructor
456 return false;
457 }
458 // Check optional sequence
459 for (int i = 4; i < last; i += 5) {
460 if (cb[i] != Bytecodes::_aload_0) return false;
461 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
462 if (cb[i+2] != Bytecodes::_putfield) return false;
463 }
464 return true;
465 }
466
467
468 bool Method::compute_has_loops_flag() {
469 BytecodeStream bcs(this);
470 Bytecodes::Code bc;
471
472 while ((bc = bcs.next()) >= 0) {
473 switch( bc ) {
474 case Bytecodes::_ifeq:
475 case Bytecodes::_ifnull:
476 case Bytecodes::_iflt:
477 case Bytecodes::_ifle:
478 case Bytecodes::_ifne:
479 case Bytecodes::_ifnonnull:
480 case Bytecodes::_ifgt:
481 case Bytecodes::_ifge:
482 case Bytecodes::_if_icmpeq:
483 case Bytecodes::_if_icmpne:
484 case Bytecodes::_if_icmplt:
485 case Bytecodes::_if_icmpgt:
486 case Bytecodes::_if_icmple:
487 case Bytecodes::_if_icmpge:
488 case Bytecodes::_if_acmpeq:
489 case Bytecodes::_if_acmpne:
490 case Bytecodes::_goto:
491 case Bytecodes::_jsr:
492 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
493 break;
494
495 case Bytecodes::_goto_w:
496 case Bytecodes::_jsr_w:
497 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
498 break;
499 }
500 }
501 _access_flags.set_loops_flag_init();
502 return _access_flags.has_loops();
503 }
504
505 bool Method::is_final_method(AccessFlags class_access_flags) const {
506 // or "does_not_require_vtable_entry"
507 // default method or overpass can occur, is not final (reuses vtable entry)
508 // private methods get vtable entries for backward class compatibility.
509 if (is_overpass() || is_default_method()) return false;
510 return is_final() || class_access_flags.is_final();
511 }
512
513 bool Method::is_final_method() const {
514 return is_final_method(method_holder()->access_flags());
515 }
516
517 bool Method::is_default_method() const {
518 if (method_holder() != NULL &&
519 method_holder()->is_interface() &&
520 !is_abstract()) {
521 return true;
522 } else {
523 return false;
524 }
525 }
526
527 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
528 if (is_final_method(class_access_flags)) return true;
529 #ifdef ASSERT
530 ResourceMark rm;
531 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
532 if (class_access_flags.is_interface()) {
533 assert(is_nonv == is_static(), err_msg("is_nonv=%s", name_and_sig_as_C_string()));
534 }
535 #endif
536 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
537 return vtable_index() == nonvirtual_vtable_index;
538 }
539
540 bool Method::can_be_statically_bound() const {
541 return can_be_statically_bound(method_holder()->access_flags());
542 }
543
544 bool Method::is_accessor() const {
545 if (code_size() != 5) return false;
546 if (size_of_parameters() != 1) return false;
547 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
548 if (java_code_at(1) != Bytecodes::_getfield) return false;
549 if (java_code_at(4) != Bytecodes::_areturn &&
550 java_code_at(4) != Bytecodes::_ireturn ) return false;
551 return true;
552 }
553
554 bool Method::is_constant_getter() const {
555 int last_index = code_size() - 1;
556 // Check if the first 1-3 bytecodes are a constant push
557 // and the last bytecode is a return.
558 return (2 <= code_size() && code_size() <= 4 &&
559 Bytecodes::is_const(java_code_at(0)) &&
560 Bytecodes::length_for(java_code_at(0)) == last_index &&
561 Bytecodes::is_return(java_code_at(last_index)));
562 }
563
564 bool Method::is_initializer() const {
565 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
566 }
567
568 bool Method::has_valid_initializer_flags() const {
569 return (is_static() ||
570 method_holder()->major_version() < 51);
571 }
572
573 bool Method::is_static_initializer() const {
574 // For classfiles version 51 or greater, ensure that the clinit method is
575 // static. Non-static methods with the name "<clinit>" are not static
576 // initializers. (older classfiles exempted for backward compatibility)
577 return name() == vmSymbols::class_initializer_name() &&
578 has_valid_initializer_flags();
579 }
580
581
582 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) {
583 int length = this_oop->checked_exceptions_length();
584 if (length == 0) { // common case
585 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
586 } else {
587 methodHandle h_this(THREAD, this_oop);
588 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
589 objArrayHandle mirrors (THREAD, m_oop);
590 for (int i = 0; i < length; i++) {
591 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
592 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
593 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
594 mirrors->obj_at_put(i, k->java_mirror());
595 }
596 return mirrors;
597 }
598 };
599
600
601 int Method::line_number_from_bci(int bci) const {
602 if (bci == SynchronizationEntryBCI) bci = 0;
603 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
604 int best_bci = 0;
605 int best_line = -1;
606
607 if (has_linenumber_table()) {
608 // The line numbers are a short array of 2-tuples [start_pc, line_number].
609 // Not necessarily sorted and not necessarily one-to-one.
610 CompressedLineNumberReadStream stream(compressed_linenumber_table());
611 while (stream.read_pair()) {
612 if (stream.bci() == bci) {
613 // perfect match
614 return stream.line();
615 } else {
616 // update best_bci/line
617 if (stream.bci() < bci && stream.bci() >= best_bci) {
618 best_bci = stream.bci();
619 best_line = stream.line();
620 }
621 }
622 }
623 }
624 return best_line;
625 }
626
627
628 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
629 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
630 Thread *thread = Thread::current();
631 Symbol* klass_name = constants()->klass_name_at(klass_index);
632 Handle loader(thread, method_holder()->class_loader());
633 Handle prot (thread, method_holder()->protection_domain());
634 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
635 } else {
636 return true;
637 }
638 }
639
640
641 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
642 int klass_index = constants()->klass_ref_index_at(refinfo_index);
643 if (must_be_resolved) {
644 // Make sure klass is resolved in constantpool.
645 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
646 }
647 return is_klass_loaded_by_klass_index(klass_index);
648 }
649
650
651 void Method::set_native_function(address function, bool post_event_flag) {
652 assert(function != NULL, "use clear_native_function to unregister natives");
653 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
654 address* native_function = native_function_addr();
655
656 // We can see racers trying to place the same native function into place. Once
657 // is plenty.
658 address current = *native_function;
659 if (current == function) return;
660 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
661 function != NULL) {
662 // native_method_throw_unsatisfied_link_error_entry() should only
663 // be passed when post_event_flag is false.
664 assert(function !=
665 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
666 "post_event_flag mis-match");
667
668 // post the bind event, and possible change the bind function
669 JvmtiExport::post_native_method_bind(this, &function);
670 }
671 *native_function = function;
672 // This function can be called more than once. We must make sure that we always
673 // use the latest registered method -> check if a stub already has been generated.
674 // If so, we have to make it not_entrant.
675 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
676 if (nm != NULL) {
677 nm->make_not_entrant();
678 }
679 }
680
681
682 bool Method::has_native_function() const {
683 if (is_method_handle_intrinsic())
684 return false; // special-cased in SharedRuntime::generate_native_wrapper
685 address func = native_function();
686 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
687 }
688
689
690 void Method::clear_native_function() {
691 // Note: is_method_handle_intrinsic() is allowed here.
692 set_native_function(
693 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
694 !native_bind_event_is_interesting);
695 clear_code();
696 }
697
698 address Method::critical_native_function() {
699 methodHandle mh(this);
700 return NativeLookup::lookup_critical_entry(mh);
701 }
702
703
704 void Method::set_signature_handler(address handler) {
705 address* signature_handler = signature_handler_addr();
706 *signature_handler = handler;
707 }
708
709
710 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
711 if (PrintCompilation && report) {
712 ttyLocker ttyl;
713 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
714 if (comp_level == CompLevel_all) {
715 tty->print("all levels ");
716 } else {
717 tty->print("levels ");
718 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
719 tty->print("%d ", i);
720 }
721 }
722 this->print_short_name(tty);
723 int size = this->code_size();
724 if (size > 0) {
725 tty->print(" (%d bytes)", size);
726 }
727 if (reason != NULL) {
728 tty->print(" %s", reason);
729 }
730 tty->cr();
731 }
732 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
733 ttyLocker ttyl;
734 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
735 os::current_thread_id(), is_osr, comp_level);
736 if (reason != NULL) {
737 xtty->print(" reason=\'%s\'", reason);
738 }
739 xtty->method(this);
740 xtty->stamp();
741 xtty->end_elem();
742 }
743 }
744
745 bool Method::is_always_compilable() const {
746 // Generated adapters must be compiled
747 if (is_method_handle_intrinsic() && is_synthetic()) {
748 assert(!is_not_c1_compilable(), "sanity check");
749 assert(!is_not_c2_compilable(), "sanity check");
750 return true;
751 }
752
753 return false;
754 }
755
756 bool Method::is_not_compilable(int comp_level) const {
757 if (number_of_breakpoints() > 0)
758 return true;
759 if (is_always_compilable())
760 return false;
761 if (comp_level == CompLevel_any)
762 return is_not_c1_compilable() || is_not_c2_compilable();
763 if (is_c1_compile(comp_level))
764 return is_not_c1_compilable();
765 if (is_c2_compile(comp_level))
766 return is_not_c2_compilable();
767 return false;
768 }
769
770 // call this when compiler finds that this method is not compilable
771 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
772 if (is_always_compilable()) {
773 // Don't mark a method which should be always compilable
774 return;
775 }
776 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
777 if (comp_level == CompLevel_all) {
778 set_not_c1_compilable();
779 set_not_c2_compilable();
780 } else {
781 if (is_c1_compile(comp_level))
782 set_not_c1_compilable();
783 if (is_c2_compile(comp_level))
784 set_not_c2_compilable();
785 }
786 CompilationPolicy::policy()->disable_compilation(this);
787 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
788 }
789
790 bool Method::is_not_osr_compilable(int comp_level) const {
791 if (is_not_compilable(comp_level))
792 return true;
793 if (comp_level == CompLevel_any)
794 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
795 if (is_c1_compile(comp_level))
796 return is_not_c1_osr_compilable();
797 if (is_c2_compile(comp_level))
798 return is_not_c2_osr_compilable();
799 return false;
800 }
801
802 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
803 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
804 if (comp_level == CompLevel_all) {
805 set_not_c1_osr_compilable();
806 set_not_c2_osr_compilable();
807 } else {
808 if (is_c1_compile(comp_level))
809 set_not_c1_osr_compilable();
810 if (is_c2_compile(comp_level))
811 set_not_c2_osr_compilable();
812 }
813 CompilationPolicy::policy()->disable_compilation(this);
814 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
815 }
816
817 // Revert to using the interpreter and clear out the nmethod
818 void Method::clear_code() {
819
820 // this may be NULL if c2i adapters have not been made yet
821 // Only should happen at allocate time.
822 if (_adapter == NULL) {
823 _from_compiled_entry = NULL;
824 } else {
825 _from_compiled_entry = _adapter->get_c2i_entry();
826 }
827 OrderAccess::storestore();
828 _from_interpreted_entry = _i2i_entry;
829 OrderAccess::storestore();
830 _code = NULL;
831 }
832
833 // Called by class data sharing to remove any entry points (which are not shared)
834 void Method::unlink_method() {
835 _code = NULL;
836 _i2i_entry = NULL;
837 _from_interpreted_entry = NULL;
838 if (is_native()) {
839 *native_function_addr() = NULL;
840 set_signature_handler(NULL);
841 }
842 NOT_PRODUCT(set_compiled_invocation_count(0);)
843 _adapter = NULL;
844 _from_compiled_entry = NULL;
845
846 // In case of DumpSharedSpaces, _method_data should always be NULL.
847 //
848 // During runtime (!DumpSharedSpaces), when we are cleaning a
849 // shared class that failed to load, this->link_method() may
850 // have already been called (before an exception happened), so
851 // this->_method_data may not be NULL.
852 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?");
853
854 set_method_data(NULL);
855 clear_method_counters();
856 }
857
858 // Called when the method_holder is getting linked. Setup entrypoints so the method
859 // is ready to be called from interpreter, compiler, and vtables.
860 void Method::link_method(methodHandle h_method, TRAPS) {
861 // If the code cache is full, we may reenter this function for the
862 // leftover methods that weren't linked.
863 if (_i2i_entry != NULL) return;
864
865 assert(_adapter == NULL, "init'd to NULL" );
866 assert( _code == NULL, "nothing compiled yet" );
867
868 // Setup interpreter entrypoint
869 assert(this == h_method(), "wrong h_method()" );
870 address entry = Interpreter::entry_for_method(h_method);
871 assert(entry != NULL, "interpreter entry must be non-null");
872 // Sets both _i2i_entry and _from_interpreted_entry
873 set_interpreter_entry(entry);
874
875 // Don't overwrite already registered native entries.
876 if (is_native() && !has_native_function()) {
877 set_native_function(
878 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
879 !native_bind_event_is_interesting);
880 }
881
882 // Setup compiler entrypoint. This is made eagerly, so we do not need
883 // special handling of vtables. An alternative is to make adapters more
884 // lazily by calling make_adapter() from from_compiled_entry() for the
885 // normal calls. For vtable calls life gets more complicated. When a
886 // call-site goes mega-morphic we need adapters in all methods which can be
887 // called from the vtable. We need adapters on such methods that get loaded
888 // later. Ditto for mega-morphic itable calls. If this proves to be a
889 // problem we'll make these lazily later.
890 (void) make_adapters(h_method, CHECK);
891
892 // ONLY USE the h_method now as make_adapter may have blocked
893
894 }
895
896 address Method::make_adapters(methodHandle mh, TRAPS) {
897 // Adapters for compiled code are made eagerly here. They are fairly
898 // small (generally < 100 bytes) and quick to make (and cached and shared)
899 // so making them eagerly shouldn't be too expensive.
900 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
901 if (adapter == NULL ) {
902 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
903 }
904
905 mh->set_adapter_entry(adapter);
906 mh->_from_compiled_entry = adapter->get_c2i_entry();
907 return adapter->get_c2i_entry();
908 }
909
910 void Method::restore_unshareable_info(TRAPS) {
911 // Since restore_unshareable_info can be called more than once for a method, don't
912 // redo any work. If this field is restored, there is nothing to do.
913 if (_from_compiled_entry == NULL) {
914 // restore method's vtable by calling a virtual function
915 restore_vtable();
916
917 methodHandle mh(THREAD, this);
918 link_method(mh, CHECK);
919 }
920 }
921
922
923 // The verified_code_entry() must be called when a invoke is resolved
924 // on this method.
925
926 // It returns the compiled code entry point, after asserting not null.
927 // This function is called after potential safepoints so that nmethod
928 // or adapter that it points to is still live and valid.
929 // This function must not hit a safepoint!
930 address Method::verified_code_entry() {
931 debug_only(No_Safepoint_Verifier nsv;)
932 assert(_from_compiled_entry != NULL, "must be set");
933 return _from_compiled_entry;
934 }
935
936 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
937 // (could be racing a deopt).
938 // Not inline to avoid circular ref.
939 bool Method::check_code() const {
940 // cached in a register or local. There's a race on the value of the field.
941 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
942 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
943 }
944
945 // Install compiled code. Instantly it can execute.
946 void Method::set_code(methodHandle mh, nmethod *code) {
947 assert( code, "use clear_code to remove code" );
948 assert( mh->check_code(), "" );
949
950 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
951
952 // These writes must happen in this order, because the interpreter will
953 // directly jump to from_interpreted_entry which jumps to an i2c adapter
954 // which jumps to _from_compiled_entry.
955 mh->_code = code; // Assign before allowing compiled code to exec
956
957 int comp_level = code->comp_level();
958 // In theory there could be a race here. In practice it is unlikely
959 // and not worth worrying about.
960 if (comp_level > mh->highest_comp_level()) {
961 mh->set_highest_comp_level(comp_level);
962 }
963
964 OrderAccess::storestore();
965 #ifdef SHARK
966 mh->_from_interpreted_entry = code->insts_begin();
967 #else //!SHARK
968 mh->_from_compiled_entry = code->verified_entry_point();
969 OrderAccess::storestore();
970 // Instantly compiled code can execute.
971 if (!mh->is_method_handle_intrinsic())
972 mh->_from_interpreted_entry = mh->get_i2c_entry();
973 #endif //!SHARK
974 }
975
976
977 bool Method::is_overridden_in(Klass* k) const {
978 InstanceKlass* ik = InstanceKlass::cast(k);
979
980 if (ik->is_interface()) return false;
981
982 // If method is an interface, we skip it - except if it
983 // is a miranda method
984 if (method_holder()->is_interface()) {
985 // Check that method is not a miranda method
986 if (ik->lookup_method(name(), signature()) == NULL) {
987 // No implementation exist - so miranda method
988 return false;
989 }
990 return true;
991 }
992
993 assert(ik->is_subclass_of(method_holder()), "should be subklass");
994 assert(ik->vtable() != NULL, "vtable should exist");
995 if (!has_vtable_index()) {
996 return false;
997 } else {
998 Method* vt_m = ik->method_at_vtable(vtable_index());
999 return vt_m != this;
1000 }
1001 }
1002
1003
1004 // give advice about whether this Method* should be cached or not
1005 bool Method::should_not_be_cached() const {
1006 if (is_old()) {
1007 // This method has been redefined. It is either EMCP or obsolete
1008 // and we don't want to cache it because that would pin the method
1009 // down and prevent it from being collectible if and when it
1010 // finishes executing.
1011 return true;
1012 }
1013
1014 // caching this method should be just fine
1015 return false;
1016 }
1017
1018
1019 /**
1020 * Returns true if this is one of the specially treated methods for
1021 * security related stack walks (like Reflection.getCallerClass).
1022 */
1023 bool Method::is_ignored_by_security_stack_walk() const {
1024 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection;
1025
1026 if (intrinsic_id() == vmIntrinsics::_invoke) {
1027 // This is Method.invoke() -- ignore it
1028 return true;
1029 }
1030 if (use_new_reflection &&
1031 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1032 // This is an auxilary frame -- ignore it
1033 return true;
1034 }
1035 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1036 // This is an internal adapter frame for method handles -- ignore it
1037 return true;
1038 }
1039 return false;
1040 }
1041
1042
1043 // Constant pool structure for invoke methods:
1044 enum {
1045 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1046 _imcp_invoke_signature, // utf8: (variable Symbol*)
1047 _imcp_limit
1048 };
1049
1050 // Test if this method is an MH adapter frame generated by Java code.
1051 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1052 bool Method::is_compiled_lambda_form() const {
1053 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1054 }
1055
1056 // Test if this method is an internal MH primitive method.
1057 bool Method::is_method_handle_intrinsic() const {
1058 vmIntrinsics::ID iid = intrinsic_id();
1059 return (MethodHandles::is_signature_polymorphic(iid) &&
1060 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1061 }
1062
1063 bool Method::has_member_arg() const {
1064 vmIntrinsics::ID iid = intrinsic_id();
1065 return (MethodHandles::is_signature_polymorphic(iid) &&
1066 MethodHandles::has_member_arg(iid));
1067 }
1068
1069 // Make an instance of a signature-polymorphic internal MH primitive.
1070 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1071 Symbol* signature,
1072 TRAPS) {
1073 ResourceMark rm;
1074 methodHandle empty;
1075
1076 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1077 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1078 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1079 if (TraceMethodHandles) {
1080 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1081 }
1082
1083 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1084 name->increment_refcount();
1085 signature->increment_refcount();
1086
1087 int cp_length = _imcp_limit;
1088 ClassLoaderData* loader_data = holder->class_loader_data();
1089 constantPoolHandle cp;
1090 {
1091 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1092 cp = constantPoolHandle(THREAD, cp_oop);
1093 }
1094 cp->set_pool_holder(InstanceKlass::cast(holder()));
1095 cp->symbol_at_put(_imcp_invoke_name, name);
1096 cp->symbol_at_put(_imcp_invoke_signature, signature);
1097 cp->set_has_preresolution();
1098
1099 // decide on access bits: public or not?
1100 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1101 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1102 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1103 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1104
1105 methodHandle m;
1106 {
1107 InlineTableSizes sizes;
1108 Method* m_oop = Method::allocate(loader_data, 0,
1109 accessFlags_from(flags_bits), &sizes,
1110 ConstMethod::NORMAL, CHECK_(empty));
1111 m = methodHandle(THREAD, m_oop);
1112 }
1113 m->set_constants(cp());
1114 m->set_name_index(_imcp_invoke_name);
1115 m->set_signature_index(_imcp_invoke_signature);
1116 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1117 assert(m->signature() == signature, "");
1118 ResultTypeFinder rtf(signature);
1119 m->constMethod()->set_result_type(rtf.type());
1120 m->compute_size_of_parameters(THREAD);
1121 m->init_intrinsic_id();
1122 assert(m->is_method_handle_intrinsic(), "");
1123 #ifdef ASSERT
1124 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1125 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1126 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1127 #endif //ASSERT
1128
1129 // Finally, set up its entry points.
1130 assert(m->can_be_statically_bound(), "");
1131 m->set_vtable_index(Method::nonvirtual_vtable_index);
1132 m->link_method(m, CHECK_(empty));
1133
1134 if (TraceMethodHandles && (Verbose || WizardMode))
1135 m->print_on(tty);
1136
1137 return m;
1138 }
1139
1140 Klass* Method::check_non_bcp_klass(Klass* klass) {
1141 if (klass != NULL && klass->class_loader() != NULL) {
1142 if (klass->oop_is_objArray())
1143 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1144 return klass;
1145 }
1146 return NULL;
1147 }
1148
1149
1150 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1151 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1152 // Code below does not work for native methods - they should never get rewritten anyway
1153 assert(!m->is_native(), "cannot rewrite native methods");
1154 // Allocate new Method*
1155 AccessFlags flags = m->access_flags();
1156
1157 ConstMethod* cm = m->constMethod();
1158 int checked_exceptions_len = cm->checked_exceptions_length();
1159 int localvariable_len = cm->localvariable_table_length();
1160 int exception_table_len = cm->exception_table_length();
1161 int method_parameters_len = cm->method_parameters_length();
1162 int method_annotations_len = cm->method_annotations_length();
1163 int parameter_annotations_len = cm->parameter_annotations_length();
1164 int type_annotations_len = cm->type_annotations_length();
1165 int default_annotations_len = cm->default_annotations_length();
1166
1167 InlineTableSizes sizes(
1168 localvariable_len,
1169 new_compressed_linenumber_size,
1170 exception_table_len,
1171 checked_exceptions_len,
1172 method_parameters_len,
1173 cm->generic_signature_index(),
1174 method_annotations_len,
1175 parameter_annotations_len,
1176 type_annotations_len,
1177 default_annotations_len,
1178 0);
1179
1180 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1181 Method* newm_oop = Method::allocate(loader_data,
1182 new_code_length,
1183 flags,
1184 &sizes,
1185 m->method_type(),
1186 CHECK_(methodHandle()));
1187 methodHandle newm (THREAD, newm_oop);
1188 int new_method_size = newm->method_size();
1189
1190 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1191 ConstMethod* newcm = newm->constMethod();
1192 int new_const_method_size = newm->constMethod()->size();
1193
1194 memcpy(newm(), m(), sizeof(Method));
1195
1196 // Create shallow copy of ConstMethod.
1197 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1198
1199 // Reset correct method/const method, method size, and parameter info
1200 newm->set_constMethod(newcm);
1201 newm->constMethod()->set_code_size(new_code_length);
1202 newm->constMethod()->set_constMethod_size(new_const_method_size);
1203 newm->set_method_size(new_method_size);
1204 assert(newm->code_size() == new_code_length, "check");
1205 assert(newm->method_parameters_length() == method_parameters_len, "check");
1206 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1207 assert(newm->exception_table_length() == exception_table_len, "check");
1208 assert(newm->localvariable_table_length() == localvariable_len, "check");
1209 // Copy new byte codes
1210 memcpy(newm->code_base(), new_code, new_code_length);
1211 // Copy line number table
1212 if (new_compressed_linenumber_size > 0) {
1213 memcpy(newm->compressed_linenumber_table(),
1214 new_compressed_linenumber_table,
1215 new_compressed_linenumber_size);
1216 }
1217 // Copy method_parameters
1218 if (method_parameters_len > 0) {
1219 memcpy(newm->method_parameters_start(),
1220 m->method_parameters_start(),
1221 method_parameters_len * sizeof(MethodParametersElement));
1222 }
1223 // Copy checked_exceptions
1224 if (checked_exceptions_len > 0) {
1225 memcpy(newm->checked_exceptions_start(),
1226 m->checked_exceptions_start(),
1227 checked_exceptions_len * sizeof(CheckedExceptionElement));
1228 }
1229 // Copy exception table
1230 if (exception_table_len > 0) {
1231 memcpy(newm->exception_table_start(),
1232 m->exception_table_start(),
1233 exception_table_len * sizeof(ExceptionTableElement));
1234 }
1235 // Copy local variable number table
1236 if (localvariable_len > 0) {
1237 memcpy(newm->localvariable_table_start(),
1238 m->localvariable_table_start(),
1239 localvariable_len * sizeof(LocalVariableTableElement));
1240 }
1241 // Copy stackmap table
1242 if (m->has_stackmap_table()) {
1243 int code_attribute_length = m->stackmap_data()->length();
1244 Array<u1>* stackmap_data =
1245 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1246 memcpy((void*)stackmap_data->adr_at(0),
1247 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1248 newm->set_stackmap_data(stackmap_data);
1249 }
1250
1251 // copy annotations over to new method
1252 newcm->copy_annotations_from(cm);
1253 return newm;
1254 }
1255
1256 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1257 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1258 // because we are not loading from core libraries
1259 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1260 // which does not use the class default class loader so we check for its loader here
1261 InstanceKlass* ik = InstanceKlass::cast(holder);
1262 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) {
1263 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1264 }
1265
1266 // see if the klass name is well-known:
1267 Symbol* klass_name = ik->name();
1268 return vmSymbols::find_sid(klass_name);
1269 }
1270
1271 void Method::init_intrinsic_id() {
1272 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1273 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1274 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1275 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1276
1277 // the klass name is well-known:
1278 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1279 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1280
1281 // ditto for method and signature:
1282 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1283 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1284 && name_id == vmSymbols::NO_SID)
1285 return;
1286 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1287 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1288 && sig_id == vmSymbols::NO_SID) return;
1289 jshort flags = access_flags().as_short();
1290
1291 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1292 if (id != vmIntrinsics::_none) {
1293 set_intrinsic_id(id);
1294 return;
1295 }
1296
1297 // A few slightly irregular cases:
1298 switch (klass_id) {
1299 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1300 // Second chance: check in regular Math.
1301 switch (name_id) {
1302 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1303 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1304 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1305 // pretend it is the corresponding method in the non-strict class:
1306 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1307 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1308 break;
1309 }
1310 break;
1311
1312 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1313 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1314 if (!is_native()) break;
1315 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1316 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1317 id = vmIntrinsics::_none;
1318 break;
1319 }
1320
1321 if (id != vmIntrinsics::_none) {
1322 // Set up its iid. It is an alias method.
1323 set_intrinsic_id(id);
1324 return;
1325 }
1326 }
1327
1328 // These two methods are static since a GC may move the Method
1329 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1330 if (THREAD->is_Compiler_thread()) {
1331 // There is nothing useful this routine can do from within the Compile thread.
1332 // Hopefully, the signature contains only well-known classes.
1333 // We could scan for this and return true/false, but the caller won't care.
1334 return false;
1335 }
1336 bool sig_is_loaded = true;
1337 Handle class_loader(THREAD, m->method_holder()->class_loader());
1338 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1339 ResourceMark rm(THREAD);
1340 Symbol* signature = m->signature();
1341 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1342 if (ss.is_object()) {
1343 Symbol* sym = ss.as_symbol(CHECK_(false));
1344 Symbol* name = sym;
1345 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1346 protection_domain, THREAD);
1347 // We are loading classes eagerly. If a ClassNotFoundException or
1348 // a LinkageError was generated, be sure to ignore it.
1349 if (HAS_PENDING_EXCEPTION) {
1350 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1351 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1352 CLEAR_PENDING_EXCEPTION;
1353 } else {
1354 return false;
1355 }
1356 }
1357 if( klass == NULL) { sig_is_loaded = false; }
1358 }
1359 }
1360 return sig_is_loaded;
1361 }
1362
1363 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1364 Handle class_loader(THREAD, m->method_holder()->class_loader());
1365 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1366 ResourceMark rm(THREAD);
1367 Symbol* signature = m->signature();
1368 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1369 if (ss.type() == T_OBJECT) {
1370 Symbol* name = ss.as_symbol_or_null();
1371 if (name == NULL) return true;
1372 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1373 if (klass == NULL) return true;
1374 }
1375 }
1376 return false;
1377 }
1378
1379 // Exposed so field engineers can debug VM
1380 void Method::print_short_name(outputStream* st) {
1381 ResourceMark rm;
1382 #ifdef PRODUCT
1383 st->print(" %s::", method_holder()->external_name());
1384 #else
1385 st->print(" %s::", method_holder()->internal_name());
1386 #endif
1387 name()->print_symbol_on(st);
1388 if (WizardMode) signature()->print_symbol_on(st);
1389 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1390 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1391 }
1392
1393 // Comparer for sorting an object array containing
1394 // Method*s.
1395 static int method_comparator(Method* a, Method* b) {
1396 return a->name()->fast_compare(b->name());
1397 }
1398
1399 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1400 // default_methods also uses this without the ordering for fast find_method
1401 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1402 int length = methods->length();
1403 if (length > 1) {
1404 {
1405 No_Safepoint_Verifier nsv;
1406 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1407 }
1408 // Reset method ordering
1409 if (set_idnums) {
1410 for (int i = 0; i < length; i++) {
1411 Method* m = methods->at(i);
1412 m->set_method_idnum(i);
1413 m->set_orig_method_idnum(i);
1414 }
1415 }
1416 }
1417 }
1418
1419 //-----------------------------------------------------------------------------------
1420 // Non-product code unless JVM/TI needs it
1421
1422 #if !defined(PRODUCT) || INCLUDE_JVMTI
1423 class SignatureTypePrinter : public SignatureTypeNames {
1424 private:
1425 outputStream* _st;
1426 bool _use_separator;
1427
1428 void type_name(const char* name) {
1429 if (_use_separator) _st->print(", ");
1430 _st->print("%s", name);
1431 _use_separator = true;
1432 }
1433
1434 public:
1435 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1436 _st = st;
1437 _use_separator = false;
1438 }
1439
1440 void print_parameters() { _use_separator = false; iterate_parameters(); }
1441 void print_returntype() { _use_separator = false; iterate_returntype(); }
1442 };
1443
1444
1445 void Method::print_name(outputStream* st) {
1446 Thread *thread = Thread::current();
1447 ResourceMark rm(thread);
1448 SignatureTypePrinter sig(signature(), st);
1449 st->print("%s ", is_static() ? "static" : "virtual");
1450 sig.print_returntype();
1451 st->print(" %s.", method_holder()->internal_name());
1452 name()->print_symbol_on(st);
1453 st->print("(");
1454 sig.print_parameters();
1455 st->print(")");
1456 }
1457 #endif // !PRODUCT || INCLUDE_JVMTI
1458
1459
1460 //-----------------------------------------------------------------------------------
1461 // Non-product code
1462
1463 #ifndef PRODUCT
1464 void Method::print_codes_on(outputStream* st) const {
1465 print_codes_on(0, code_size(), st);
1466 }
1467
1468 void Method::print_codes_on(int from, int to, outputStream* st) const {
1469 Thread *thread = Thread::current();
1470 ResourceMark rm(thread);
1471 methodHandle mh (thread, (Method*)this);
1472 BytecodeStream s(mh);
1473 s.set_interval(from, to);
1474 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1475 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1476 }
1477 #endif // not PRODUCT
1478
1479
1480 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1481 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1482 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1483 // as end-of-stream terminator.
1484
1485 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1486 // bci and line number does not compress into single byte.
1487 // Write out escape character and use regular compression for bci and line number.
1488 write_byte((jubyte)0xFF);
1489 write_signed_int(bci_delta);
1490 write_signed_int(line_delta);
1491 }
1492
1493 // See comment in method.hpp which explains why this exists.
1494 #if defined(_M_AMD64) && _MSC_VER >= 1400
1495 #pragma optimize("", off)
1496 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1497 write_pair_inline(bci, line);
1498 }
1499 #pragma optimize("", on)
1500 #endif
1501
1502 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1503 _bci = 0;
1504 _line = 0;
1505 };
1506
1507
1508 bool CompressedLineNumberReadStream::read_pair() {
1509 jubyte next = read_byte();
1510 // Check for terminator
1511 if (next == 0) return false;
1512 if (next == 0xFF) {
1513 // Escape character, regular compression used
1514 _bci += read_signed_int();
1515 _line += read_signed_int();
1516 } else {
1517 // Single byte compression used
1518 _bci += next >> 3;
1519 _line += next & 0x7;
1520 }
1521 return true;
1522 }
1523
1524
1525 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1526 BreakpointInfo* bp = method_holder()->breakpoints();
1527 for (; bp != NULL; bp = bp->next()) {
1528 if (bp->match(this, bci)) {
1529 return bp->orig_bytecode();
1530 }
1531 }
1532 {
1533 ResourceMark rm;
1534 fatal(err_msg("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci));
1535 }
1536 return Bytecodes::_shouldnotreachhere;
1537 }
1538
1539 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1540 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1541 BreakpointInfo* bp = method_holder()->breakpoints();
1542 for (; bp != NULL; bp = bp->next()) {
1543 if (bp->match(this, bci)) {
1544 bp->set_orig_bytecode(code);
1545 // and continue, in case there is more than one
1546 }
1547 }
1548 }
1549
1550 void Method::set_breakpoint(int bci) {
1551 InstanceKlass* ik = method_holder();
1552 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1553 bp->set_next(ik->breakpoints());
1554 ik->set_breakpoints(bp);
1555 // do this last:
1556 bp->set(this);
1557 }
1558
1559 static void clear_matches(Method* m, int bci) {
1560 InstanceKlass* ik = m->method_holder();
1561 BreakpointInfo* prev_bp = NULL;
1562 BreakpointInfo* next_bp;
1563 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1564 next_bp = bp->next();
1565 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1566 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1567 // do this first:
1568 bp->clear(m);
1569 // unhook it
1570 if (prev_bp != NULL)
1571 prev_bp->set_next(next_bp);
1572 else
1573 ik->set_breakpoints(next_bp);
1574 delete bp;
1575 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1576 // at same location. So we have multiple matching (method_index and bci)
1577 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1578 // breakpoint for clear_breakpoint request and keep all other method versions
1579 // BreakpointInfo for future clear_breakpoint request.
1580 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1581 // which is being called when class is unloaded. We delete all the Breakpoint
1582 // information for all versions of method. We may not correctly restore the original
1583 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1584 // so these methods won't be used anymore.
1585 if (bci >= 0) {
1586 break;
1587 }
1588 } else {
1589 // This one is a keeper.
1590 prev_bp = bp;
1591 }
1592 }
1593 }
1594
1595 void Method::clear_breakpoint(int bci) {
1596 assert(bci >= 0, "");
1597 clear_matches(this, bci);
1598 }
1599
1600 void Method::clear_all_breakpoints() {
1601 clear_matches(this, -1);
1602 }
1603
1604
1605 int Method::invocation_count() {
1606 MethodCounters *mcs = method_counters();
1607 if (TieredCompilation) {
1608 MethodData* const mdo = method_data();
1609 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1610 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1611 return InvocationCounter::count_limit;
1612 } else {
1613 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1614 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1615 }
1616 } else {
1617 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1618 }
1619 }
1620
1621 int Method::backedge_count() {
1622 MethodCounters *mcs = method_counters();
1623 if (TieredCompilation) {
1624 MethodData* const mdo = method_data();
1625 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1626 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1627 return InvocationCounter::count_limit;
1628 } else {
1629 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1630 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1631 }
1632 } else {
1633 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1634 }
1635 }
1636
1637 int Method::highest_comp_level() const {
1638 const MethodCounters* mcs = method_counters();
1639 if (mcs != NULL) {
1640 return mcs->highest_comp_level();
1641 } else {
1642 return CompLevel_none;
1643 }
1644 }
1645
1646 int Method::highest_osr_comp_level() const {
1647 const MethodCounters* mcs = method_counters();
1648 if (mcs != NULL) {
1649 return mcs->highest_osr_comp_level();
1650 } else {
1651 return CompLevel_none;
1652 }
1653 }
1654
1655 void Method::set_highest_comp_level(int level) {
1656 MethodCounters* mcs = method_counters();
1657 if (mcs != NULL) {
1658 mcs->set_highest_comp_level(level);
1659 }
1660 }
1661
1662 void Method::set_highest_osr_comp_level(int level) {
1663 MethodCounters* mcs = method_counters();
1664 if (mcs != NULL) {
1665 mcs->set_highest_osr_comp_level(level);
1666 }
1667 }
1668
1669 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1670 _bci = bci;
1671 _name_index = m->name_index();
1672 _signature_index = m->signature_index();
1673 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1674 if (_orig_bytecode == Bytecodes::_breakpoint)
1675 _orig_bytecode = m->orig_bytecode_at(_bci);
1676 _next = NULL;
1677 }
1678
1679 void BreakpointInfo::set(Method* method) {
1680 #ifdef ASSERT
1681 {
1682 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1683 if (code == Bytecodes::_breakpoint)
1684 code = method->orig_bytecode_at(_bci);
1685 assert(orig_bytecode() == code, "original bytecode must be the same");
1686 }
1687 #endif
1688 Thread *thread = Thread::current();
1689 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1690 method->incr_number_of_breakpoints(thread);
1691 SystemDictionary::notice_modification();
1692 {
1693 // Deoptimize all dependents on this method
1694 HandleMark hm(thread);
1695 methodHandle mh(thread, method);
1696 Universe::flush_dependents_on_method(mh);
1697 }
1698 }
1699
1700 void BreakpointInfo::clear(Method* method) {
1701 *method->bcp_from(_bci) = orig_bytecode();
1702 assert(method->number_of_breakpoints() > 0, "must not go negative");
1703 method->decr_number_of_breakpoints(Thread::current());
1704 }
1705
1706 // jmethodID handling
1707
1708 // This is a block allocating object, sort of like JNIHandleBlock, only a
1709 // lot simpler. There aren't many of these, they aren't long, they are rarely
1710 // deleted and so we can do some suboptimal things.
1711 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1712 // never get rid of it.
1713 // It would be nice to be able to parameterize the number of methods for
1714 // the null_class_loader but then we'd have to turn this and ClassLoaderData
1715 // into templates.
1716
1717 // I feel like this brain dead class should exist somewhere in the STL
1718
1719 class JNIMethodBlock : public CHeapObj<mtClass> {
1720 enum { number_of_methods = 8 };
1721
1722 Method* _methods[number_of_methods];
1723 int _top;
1724 JNIMethodBlock* _next;
1725 public:
1726 static Method* const _free_method;
1727
1728 JNIMethodBlock() : _next(NULL), _top(0) {
1729 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method;
1730 }
1731
1732 Method** add_method(Method* m) {
1733 if (_top < number_of_methods) {
1734 // top points to the next free entry.
1735 int i = _top;
1736 _methods[i] = m;
1737 _top++;
1738 return &_methods[i];
1739 } else if (_top == number_of_methods) {
1740 // if the next free entry ran off the block see if there's a free entry
1741 for (int i = 0; i< number_of_methods; i++) {
1742 if (_methods[i] == _free_method) {
1743 _methods[i] = m;
1744 return &_methods[i];
1745 }
1746 }
1747 // Only check each block once for frees. They're very unlikely.
1748 // Increment top past the end of the block.
1749 _top++;
1750 }
1751 // need to allocate a next block.
1752 if (_next == NULL) {
1753 _next = new JNIMethodBlock();
1754 }
1755 return _next->add_method(m);
1756 }
1757
1758 bool contains(Method** m) {
1759 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1760 for (int i = 0; i< number_of_methods; i++) {
1761 if (&(b->_methods[i]) == m) {
1762 return true;
1763 }
1764 }
1765 }
1766 return false; // not found
1767 }
1768
1769 // Doesn't really destroy it, just marks it as free so it can be reused.
1770 void destroy_method(Method** m) {
1771 #ifdef ASSERT
1772 assert(contains(m), "should be a methodID");
1773 #endif // ASSERT
1774 *m = _free_method;
1775 }
1776 void clear_method(Method* m) {
1777 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1778 for (int i = 0; i< number_of_methods; i++) {
1779 if (b->_methods[i] == m) {
1780 b->_methods[i] = NULL;
1781 }
1782 }
1783 }
1784 // not found
1785 }
1786
1787 // During class unloading the methods are cleared, which is different
1788 // than freed.
1789 void clear_all_methods() {
1790 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1791 for (int i = 0; i< number_of_methods; i++) {
1792 b->_methods[i] = NULL;
1793 }
1794 }
1795 }
1796 #ifndef PRODUCT
1797 int count_methods() {
1798 // count all allocated methods
1799 int count = 0;
1800 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1801 for (int i = 0; i< number_of_methods; i++) {
1802 if (b->_methods[i] != _free_method) count++;
1803 }
1804 }
1805 return count;
1806 }
1807 #endif // PRODUCT
1808 };
1809
1810 // Something that can't be mistaken for an address or a markOop
1811 Method* const JNIMethodBlock::_free_method = (Method*)55;
1812
1813 // Add a method id to the jmethod_ids
1814 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
1815 ClassLoaderData* cld = loader_data;
1816
1817 if (!SafepointSynchronize::is_at_safepoint()) {
1818 // Have to add jmethod_ids() to class loader data thread-safely.
1819 // Also have to add the method to the list safely, which the cld lock
1820 // protects as well.
1821 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1822 if (cld->jmethod_ids() == NULL) {
1823 cld->set_jmethod_ids(new JNIMethodBlock());
1824 }
1825 // jmethodID is a pointer to Method*
1826 return (jmethodID)cld->jmethod_ids()->add_method(m);
1827 } else {
1828 // At safepoint, we are single threaded and can set this.
1829 if (cld->jmethod_ids() == NULL) {
1830 cld->set_jmethod_ids(new JNIMethodBlock());
1831 }
1832 // jmethodID is a pointer to Method*
1833 return (jmethodID)cld->jmethod_ids()->add_method(m);
1834 }
1835 }
1836
1837 // Mark a jmethodID as free. This is called when there is a data race in
1838 // InstanceKlass while creating the jmethodID cache.
1839 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
1840 ClassLoaderData* cld = loader_data;
1841 Method** ptr = (Method**)m;
1842 assert(cld->jmethod_ids() != NULL, "should have method handles");
1843 cld->jmethod_ids()->destroy_method(ptr);
1844 }
1845
1846 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
1847 // Can't assert the method_holder is the same because the new method has the
1848 // scratch method holder.
1849 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
1850 == new_method->method_holder()->class_loader(),
1851 "changing to a different class loader");
1852 // Just change the method in place, jmethodID pointer doesn't change.
1853 *((Method**)jmid) = new_method;
1854 }
1855
1856 bool Method::is_method_id(jmethodID mid) {
1857 Method* m = resolve_jmethod_id(mid);
1858 if (m == NULL) {
1859 return false;
1860 }
1861 InstanceKlass* ik = m->method_holder();
1862 if (ik == NULL) {
1863 return false;
1864 }
1865 ClassLoaderData* cld = ik->class_loader_data();
1866 if (cld->jmethod_ids() == NULL) return false;
1867 return (cld->jmethod_ids()->contains((Method**)mid));
1868 }
1869
1870 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
1871 if (mid == NULL) return NULL;
1872 if (!Method::is_method_id(mid)) {
1873 return NULL;
1874 }
1875 Method* o = resolve_jmethod_id(mid);
1876 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
1877 return NULL;
1878 }
1879 return o;
1880 };
1881
1882 void Method::clear_jmethod_id(ClassLoaderData* loader_data) {
1883 loader_data->jmethod_ids()->clear_method(this);
1884 }
1885
1886 void Method::set_on_stack(const bool value) {
1887 // Set both the method itself and its constant pool. The constant pool
1888 // on stack means some method referring to it is also on the stack.
1889 constants()->set_on_stack(value);
1890
1891 bool succeeded = _access_flags.set_on_stack(value);
1892 if (value && succeeded) {
1893 MetadataOnStackMark::record(this, Thread::current());
1894 }
1895 }
1896
1897 // Called when the class loader is unloaded to make all methods weak.
1898 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1899 loader_data->jmethod_ids()->clear_all_methods();
1900 }
1901
1902 bool Method::has_method_vptr(const void* ptr) {
1903 Method m;
1904 // This assumes that the vtbl pointer is the first word of a C++ object.
1905 // This assumption is also in universe.cpp patch_klass_vtble
1906 void* vtbl2 = dereference_vptr((const void*)&m);
1907 void* this_vtbl = dereference_vptr(ptr);
1908 return vtbl2 == this_vtbl;
1909 }
1910
1911 // Check that this pointer is valid by checking that the vtbl pointer matches
1912 bool Method::is_valid_method() const {
1913 if (this == NULL) {
1914 return false;
1915 } else if (!is_metaspace_object()) {
1916 return false;
1917 } else {
1918 return has_method_vptr((const void*)this);
1919 }
1920 }
1921
1922 #ifndef PRODUCT
1923 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1924 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1925 }
1926 #endif // PRODUCT
1927
1928
1929 // Printing
1930
1931 #ifndef PRODUCT
1932
1933 void Method::print_on(outputStream* st) const {
1934 ResourceMark rm;
1935 assert(is_method(), "must be method");
1936 st->print_cr("%s", internal_name());
1937 // get the effect of PrintOopAddress, always, for methods:
1938 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this);
1939 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
1940 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants());
1941 constants()->print_value_on(st); st->cr();
1942 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
1943 st->print (" - name: "); name()->print_value_on(st); st->cr();
1944 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
1945 st->print_cr(" - max stack: %d", max_stack());
1946 st->print_cr(" - max locals: %d", max_locals());
1947 st->print_cr(" - size of params: %d", size_of_parameters());
1948 st->print_cr(" - method size: %d", method_size());
1949 if (intrinsic_id() != vmIntrinsics::_none)
1950 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
1951 if (highest_comp_level() != CompLevel_none)
1952 st->print_cr(" - highest level: %d", highest_comp_level());
1953 st->print_cr(" - vtable index: %d", _vtable_index);
1954 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
1955 st->print( " - adapters: ");
1956 AdapterHandlerEntry* a = ((Method*)this)->adapter();
1957 if (a == NULL)
1958 st->print_cr(INTPTR_FORMAT, a);
1959 else
1960 a->print_adapter_on(st);
1961 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
1962 st->print_cr(" - code size: %d", code_size());
1963 if (code_size() != 0) {
1964 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
1965 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
1966 }
1967 if (method_data() != NULL) {
1968 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
1969 }
1970 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
1971 if (checked_exceptions_length() > 0) {
1972 CheckedExceptionElement* table = checked_exceptions_start();
1973 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
1974 if (Verbose) {
1975 for (int i = 0; i < checked_exceptions_length(); i++) {
1976 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
1977 }
1978 }
1979 }
1980 if (has_linenumber_table()) {
1981 u_char* table = compressed_linenumber_table();
1982 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
1983 if (Verbose) {
1984 CompressedLineNumberReadStream stream(table);
1985 while (stream.read_pair()) {
1986 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
1987 }
1988 }
1989 }
1990 st->print_cr(" - localvar length: %d", localvariable_table_length());
1991 if (localvariable_table_length() > 0) {
1992 LocalVariableTableElement* table = localvariable_table_start();
1993 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
1994 if (Verbose) {
1995 for (int i = 0; i < localvariable_table_length(); i++) {
1996 int bci = table[i].start_bci;
1997 int len = table[i].length;
1998 const char* name = constants()->printable_name_at(table[i].name_cp_index);
1999 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2000 int slot = table[i].slot;
2001 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2002 }
2003 }
2004 }
2005 if (code() != NULL) {
2006 st->print (" - compiled code: ");
2007 code()->print_value_on(st);
2008 }
2009 if (is_native()) {
2010 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
2011 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
2012 }
2013 }
2014
2015 #endif //PRODUCT
2016
2017 void Method::print_value_on(outputStream* st) const {
2018 assert(is_method(), "must be method");
2019 st->print("%s", internal_name());
2020 print_address_on(st);
2021 st->print(" ");
2022 name()->print_value_on(st);
2023 st->print(" ");
2024 signature()->print_value_on(st);
2025 st->print(" in ");
2026 method_holder()->print_value_on(st);
2027 if (WizardMode) st->print("#%d", _vtable_index);
2028 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2029 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2030 }
2031
2032 #if INCLUDE_SERVICES
2033 // Size Statistics
2034 void Method::collect_statistics(KlassSizeStats *sz) const {
2035 int mysize = sz->count(this);
2036 sz->_method_bytes += mysize;
2037 sz->_method_all_bytes += mysize;
2038 sz->_rw_bytes += mysize;
2039
2040 if (constMethod()) {
2041 constMethod()->collect_statistics(sz);
2042 }
2043 if (method_data()) {
2044 method_data()->collect_statistics(sz);
2045 }
2046 }
2047 #endif // INCLUDE_SERVICES
2048
2049 // Verification
2050
2051 void Method::verify_on(outputStream* st) {
2052 guarantee(is_method(), "object must be method");
2053 guarantee(constants()->is_constantPool(), "should be constant pool");
2054 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2055 MethodData* md = method_data();
2056 guarantee(md == NULL ||
2057 md->is_methodData(), "should be method data");
2058 }