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/metaspaceShared.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "oops/constMethod.hpp"
42 #include "oops/methodData.hpp"
43 #include "oops/method.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "oops/symbol.hpp"
46 #include "prims/jvmtiExport.hpp"
47 #include "prims/methodHandles.hpp"
48 #include "prims/nativeLookup.hpp"
49 #include "runtime/arguments.hpp"
50 #include "runtime/compilationPolicy.hpp"
51 #include "runtime/frame.inline.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "runtime/orderAccess.inline.hpp"
54 #include "runtime/relocator.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "runtime/signature.hpp"
57 #include "utilities/quickSort.hpp"
58 #include "utilities/xmlstream.hpp"
59
60 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
61
62 // Implementation of Method
63
64 Method* Method::allocate(ClassLoaderData* loader_data,
65 int byte_code_size,
66 AccessFlags access_flags,
67 InlineTableSizes* sizes,
68 ConstMethod::MethodType method_type,
69 TRAPS) {
70 assert(!access_flags.is_native() || byte_code_size == 0,
71 "native methods should not contain byte codes");
72 ConstMethod* cm = ConstMethod::allocate(loader_data,
73 byte_code_size,
74 sizes,
75 method_type,
76 CHECK_NULL);
77
78 int size = Method::size(access_flags.is_native());
79
80 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, size);
81 }
82
83 Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) {
84 No_Safepoint_Verifier no_safepoint;
85 set_constMethod(xconst);
86 set_access_flags(access_flags);
87 set_method_size(size);
88 set_intrinsic_id(vmIntrinsics::_none);
89 set_jfr_towrite(false);
90 set_force_inline(false);
91 set_hidden(false);
92 set_dont_inline(false);
93 set_has_injected_profile(false);
94 set_method_data(NULL);
95 clear_method_counters();
96 set_vtable_index(Method::garbage_vtable_index);
97
98 // Fix and bury in Method*
99 set_interpreter_entry(NULL); // sets i2i entry and from_int
100 set_adapter_entry(NULL);
101 clear_code(); // from_c/from_i get set to c2i/i2i
102
103 if (access_flags.is_native()) {
104 clear_native_function();
105 set_signature_handler(NULL);
106 }
107
108 NOT_PRODUCT(set_compiled_invocation_count(0);)
109 }
110
111 // Release Method*. The nmethod will be gone when we get here because
112 // we've walked the code cache.
113 void Method::deallocate_contents(ClassLoaderData* 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 void Method::set_vtable_index(int index) {
310 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
311 // At runtime initialize_vtable is rerun as part of link_class_impl()
312 // for a shared class loaded by the non-boot loader to obtain the loader
313 // constraints based on the runtime classloaders' context.
314 return; // don't write into the shared class
315 } else {
316 _vtable_index = index;
317 }
318 }
319
320 void Method::set_itable_index(int index) {
321 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
322 // At runtime initialize_itable is rerun as part of link_class_impl()
323 // for a shared class loaded by the non-boot loader to obtain the loader
324 // constraints based on the runtime classloaders' context. The dumptime
325 // itable index should be the same as the runtime index.
326 assert(_vtable_index == itable_index_max - index,
327 "archived itable index is different from runtime index");
328 return; // don’t write into the shared class
329 } else {
330 _vtable_index = itable_index_max - index;
331 }
332 assert(valid_itable_index(), "");
333 }
334
335
336
337 bool Method::was_executed_more_than(int n) {
338 // Invocation counter is reset when the Method* is compiled.
339 // If the method has compiled code we therefore assume it has
340 // be excuted more than n times.
341 if (is_accessor() || is_empty_method() || (code() != NULL)) {
342 // interpreter doesn't bump invocation counter of trivial methods
343 // compiler does not bump invocation counter of compiled methods
344 return true;
345 }
346 else if ((method_counters() != NULL &&
347 method_counters()->invocation_counter()->carry()) ||
348 (method_data() != NULL &&
349 method_data()->invocation_counter()->carry())) {
350 // The carry bit is set when the counter overflows and causes
351 // a compilation to occur. We don't know how many times
352 // the counter has been reset, so we simply assume it has
353 // been executed more than n times.
354 return true;
355 } else {
356 return invocation_count() > n;
357 }
358 }
359
360 #ifndef PRODUCT
361 void Method::print_invocation_count() {
362 if (is_static()) tty->print("static ");
363 if (is_final()) tty->print("final ");
364 if (is_synchronized()) tty->print("synchronized ");
365 if (is_native()) tty->print("native ");
366 method_holder()->name()->print_symbol_on(tty);
367 tty->print(".");
368 name()->print_symbol_on(tty);
369 signature()->print_symbol_on(tty);
370
371 if (WizardMode) {
372 // dump the size of the byte codes
373 tty->print(" {%d}", code_size());
374 }
375 tty->cr();
376
377 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
378 tty->print_cr (" invocation_counter: %8d ", invocation_count());
379 tty->print_cr (" backedge_counter: %8d ", backedge_count());
380 if (CountCompiledCalls) {
381 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
382 }
383
384 }
385 #endif
386
387 // Build a MethodData* object to hold information about this method
388 // collected in the interpreter.
389 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
390 // Do not profile method if current thread holds the pending list lock,
391 // which avoids deadlock for acquiring the MethodData_lock.
392 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
393 return;
394 }
395
396 // Grab a lock here to prevent multiple
397 // MethodData*s from being created.
398 MutexLocker ml(MethodData_lock, THREAD);
399 if (method->method_data() == NULL) {
400 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
401 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);
402 method->set_method_data(method_data);
403 if (PrintMethodData && (Verbose || WizardMode)) {
404 ResourceMark rm(THREAD);
405 tty->print("build_interpreter_method_data for ");
406 method->print_name(tty);
407 tty->cr();
408 // At the end of the run, the MDO, full of data, will be dumped.
409 }
410 }
411 }
412
413 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
414 methodHandle mh(m);
415 ClassLoaderData* loader_data = mh->method_holder()->class_loader_data();
416 MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL);
417 if (!mh->init_method_counters(counters)) {
418 MetadataFactory::free_metadata(loader_data, counters);
419 }
420 return mh->method_counters();
421 }
422
423 void Method::cleanup_inline_caches() {
424 // The current system doesn't use inline caches in the interpreter
425 // => nothing to do (keep this method around for future use)
426 }
427
428
429 int Method::extra_stack_words() {
430 // not an inline function, to avoid a header dependency on Interpreter
431 return extra_stack_entries() * Interpreter::stackElementSize;
432 }
433
434
435 void Method::compute_size_of_parameters(Thread *thread) {
436 ArgumentSizeComputer asc(signature());
437 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
438 }
439
440 BasicType Method::result_type() const {
441 ResultTypeFinder rtf(signature());
442 return rtf.type();
443 }
444
445
446 bool Method::is_empty_method() const {
447 return code_size() == 1
448 && *code_base() == Bytecodes::_return;
449 }
450
451
452 bool Method::is_vanilla_constructor() const {
453 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
454 // which only calls the superclass vanilla constructor and possibly does stores of
455 // zero constants to local fields:
456 //
457 // aload_0
458 // invokespecial
459 // indexbyte1
460 // indexbyte2
461 //
462 // followed by an (optional) sequence of:
463 //
464 // aload_0
465 // aconst_null / iconst_0 / fconst_0 / dconst_0
466 // putfield
467 // indexbyte1
468 // indexbyte2
469 //
470 // followed by:
471 //
472 // return
473
474 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
475 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
476 int size = code_size();
477 // Check if size match
478 if (size == 0 || size % 5 != 0) return false;
479 address cb = code_base();
480 int last = size - 1;
481 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
482 // Does not call superclass default constructor
483 return false;
484 }
485 // Check optional sequence
486 for (int i = 4; i < last; i += 5) {
487 if (cb[i] != Bytecodes::_aload_0) return false;
488 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
489 if (cb[i+2] != Bytecodes::_putfield) return false;
490 }
491 return true;
492 }
493
494
495 bool Method::compute_has_loops_flag() {
496 BytecodeStream bcs(this);
497 Bytecodes::Code bc;
498
499 while ((bc = bcs.next()) >= 0) {
500 switch( bc ) {
501 case Bytecodes::_ifeq:
502 case Bytecodes::_ifnull:
503 case Bytecodes::_iflt:
504 case Bytecodes::_ifle:
505 case Bytecodes::_ifne:
506 case Bytecodes::_ifnonnull:
507 case Bytecodes::_ifgt:
508 case Bytecodes::_ifge:
509 case Bytecodes::_if_icmpeq:
510 case Bytecodes::_if_icmpne:
511 case Bytecodes::_if_icmplt:
512 case Bytecodes::_if_icmpgt:
513 case Bytecodes::_if_icmple:
514 case Bytecodes::_if_icmpge:
515 case Bytecodes::_if_acmpeq:
516 case Bytecodes::_if_acmpne:
517 case Bytecodes::_goto:
518 case Bytecodes::_jsr:
519 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
520 break;
521
522 case Bytecodes::_goto_w:
523 case Bytecodes::_jsr_w:
524 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
525 break;
526 }
527 }
528 _access_flags.set_loops_flag_init();
529 return _access_flags.has_loops();
530 }
531
532 bool Method::is_final_method(AccessFlags class_access_flags) const {
533 // or "does_not_require_vtable_entry"
534 // default method or overpass can occur, is not final (reuses vtable entry)
535 // private methods get vtable entries for backward class compatibility.
536 if (is_overpass() || is_default_method()) return false;
537 return is_final() || class_access_flags.is_final();
538 }
539
540 bool Method::is_final_method() const {
541 return is_final_method(method_holder()->access_flags());
542 }
543
544 bool Method::is_default_method() const {
545 if (method_holder() != NULL &&
546 method_holder()->is_interface() &&
547 !is_abstract()) {
548 return true;
549 } else {
550 return false;
551 }
552 }
553
554 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
555 if (is_final_method(class_access_flags)) return true;
556 #ifdef ASSERT
557 ResourceMark rm;
558 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
559 if (class_access_flags.is_interface()) {
560 assert(is_nonv == is_static(), err_msg("is_nonv=%s", name_and_sig_as_C_string()));
561 }
562 #endif
563 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
564 return vtable_index() == nonvirtual_vtable_index;
565 }
566
567 bool Method::can_be_statically_bound() const {
568 return can_be_statically_bound(method_holder()->access_flags());
569 }
570
571 bool Method::is_accessor() const {
572 if (code_size() != 5) return false;
573 if (size_of_parameters() != 1) return false;
574 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
575 if (java_code_at(1) != Bytecodes::_getfield) return false;
576 if (java_code_at(4) != Bytecodes::_areturn &&
577 java_code_at(4) != Bytecodes::_ireturn ) return false;
578 return true;
579 }
580
581 bool Method::is_constant_getter() const {
582 int last_index = code_size() - 1;
583 // Check if the first 1-3 bytecodes are a constant push
584 // and the last bytecode is a return.
585 return (2 <= code_size() && code_size() <= 4 &&
586 Bytecodes::is_const(java_code_at(0)) &&
587 Bytecodes::length_for(java_code_at(0)) == last_index &&
588 Bytecodes::is_return(java_code_at(last_index)));
589 }
590
591 bool Method::is_initializer() const {
592 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
593 }
594
595 bool Method::has_valid_initializer_flags() const {
596 return (is_static() ||
597 method_holder()->major_version() < 51);
598 }
599
600 bool Method::is_static_initializer() const {
601 // For classfiles version 51 or greater, ensure that the clinit method is
602 // static. Non-static methods with the name "<clinit>" are not static
603 // initializers. (older classfiles exempted for backward compatibility)
604 return name() == vmSymbols::class_initializer_name() &&
605 has_valid_initializer_flags();
606 }
607
608
609 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) {
610 int length = this_oop->checked_exceptions_length();
611 if (length == 0) { // common case
612 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
613 } else {
614 methodHandle h_this(THREAD, this_oop);
615 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
616 objArrayHandle mirrors (THREAD, m_oop);
617 for (int i = 0; i < length; i++) {
618 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
619 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
620 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
621 mirrors->obj_at_put(i, k->java_mirror());
622 }
623 return mirrors;
624 }
625 };
626
627
628 int Method::line_number_from_bci(int bci) const {
629 if (bci == SynchronizationEntryBCI) bci = 0;
630 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
631 int best_bci = 0;
632 int best_line = -1;
633
634 if (has_linenumber_table()) {
635 // The line numbers are a short array of 2-tuples [start_pc, line_number].
636 // Not necessarily sorted and not necessarily one-to-one.
637 CompressedLineNumberReadStream stream(compressed_linenumber_table());
638 while (stream.read_pair()) {
639 if (stream.bci() == bci) {
640 // perfect match
641 return stream.line();
642 } else {
643 // update best_bci/line
644 if (stream.bci() < bci && stream.bci() >= best_bci) {
645 best_bci = stream.bci();
646 best_line = stream.line();
647 }
648 }
649 }
650 }
651 return best_line;
652 }
653
654
655 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
656 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
657 Thread *thread = Thread::current();
658 Symbol* klass_name = constants()->klass_name_at(klass_index);
659 Handle loader(thread, method_holder()->class_loader());
660 Handle prot (thread, method_holder()->protection_domain());
661 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
662 } else {
663 return true;
664 }
665 }
666
667
668 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
669 int klass_index = constants()->klass_ref_index_at(refinfo_index);
670 if (must_be_resolved) {
671 // Make sure klass is resolved in constantpool.
672 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
673 }
674 return is_klass_loaded_by_klass_index(klass_index);
675 }
676
677
678 void Method::set_native_function(address function, bool post_event_flag) {
679 assert(function != NULL, "use clear_native_function to unregister natives");
680 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
681 address* native_function = native_function_addr();
682
683 // We can see racers trying to place the same native function into place. Once
684 // is plenty.
685 address current = *native_function;
686 if (current == function) return;
687 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
688 function != NULL) {
689 // native_method_throw_unsatisfied_link_error_entry() should only
690 // be passed when post_event_flag is false.
691 assert(function !=
692 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
693 "post_event_flag mis-match");
694
695 // post the bind event, and possible change the bind function
696 JvmtiExport::post_native_method_bind(this, &function);
697 }
698 *native_function = function;
699 // This function can be called more than once. We must make sure that we always
700 // use the latest registered method -> check if a stub already has been generated.
701 // If so, we have to make it not_entrant.
702 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
703 if (nm != NULL) {
704 nm->make_not_entrant();
705 }
706 }
707
708
709 bool Method::has_native_function() const {
710 if (is_method_handle_intrinsic())
711 return false; // special-cased in SharedRuntime::generate_native_wrapper
712 address func = native_function();
713 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
714 }
715
716
717 void Method::clear_native_function() {
718 // Note: is_method_handle_intrinsic() is allowed here.
719 set_native_function(
720 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
721 !native_bind_event_is_interesting);
722 clear_code();
723 }
724
725 address Method::critical_native_function() {
726 methodHandle mh(this);
727 return NativeLookup::lookup_critical_entry(mh);
728 }
729
730
731 void Method::set_signature_handler(address handler) {
732 address* signature_handler = signature_handler_addr();
733 *signature_handler = handler;
734 }
735
736
737 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
738 if (PrintCompilation && report) {
739 ttyLocker ttyl;
740 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
741 if (comp_level == CompLevel_all) {
742 tty->print("all levels ");
743 } else {
744 tty->print("levels ");
745 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
746 tty->print("%d ", i);
747 }
748 }
749 this->print_short_name(tty);
750 int size = this->code_size();
751 if (size > 0) {
752 tty->print(" (%d bytes)", size);
753 }
754 if (reason != NULL) {
755 tty->print(" %s", reason);
756 }
757 tty->cr();
758 }
759 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
760 ttyLocker ttyl;
761 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
762 os::current_thread_id(), is_osr, comp_level);
763 if (reason != NULL) {
764 xtty->print(" reason=\'%s\'", reason);
765 }
766 xtty->method(this);
767 xtty->stamp();
768 xtty->end_elem();
769 }
770 }
771
772 bool Method::is_always_compilable() const {
773 // Generated adapters must be compiled
774 if (is_method_handle_intrinsic() && is_synthetic()) {
775 assert(!is_not_c1_compilable(), "sanity check");
776 assert(!is_not_c2_compilable(), "sanity check");
777 return true;
778 }
779
780 return false;
781 }
782
783 bool Method::is_not_compilable(int comp_level) const {
784 if (number_of_breakpoints() > 0)
785 return true;
786 if (is_always_compilable())
787 return false;
788 if (comp_level == CompLevel_any)
789 return is_not_c1_compilable() || is_not_c2_compilable();
790 if (is_c1_compile(comp_level))
791 return is_not_c1_compilable();
792 if (is_c2_compile(comp_level))
793 return is_not_c2_compilable();
794 return false;
795 }
796
797 // call this when compiler finds that this method is not compilable
798 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
799 if (is_always_compilable()) {
800 // Don't mark a method which should be always compilable
801 return;
802 }
803 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
804 if (comp_level == CompLevel_all) {
805 set_not_c1_compilable();
806 set_not_c2_compilable();
807 } else {
808 if (is_c1_compile(comp_level))
809 set_not_c1_compilable();
810 if (is_c2_compile(comp_level))
811 set_not_c2_compilable();
812 }
813 CompilationPolicy::policy()->disable_compilation(this);
814 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
815 }
816
817 bool Method::is_not_osr_compilable(int comp_level) const {
818 if (is_not_compilable(comp_level))
819 return true;
820 if (comp_level == CompLevel_any)
821 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
822 if (is_c1_compile(comp_level))
823 return is_not_c1_osr_compilable();
824 if (is_c2_compile(comp_level))
825 return is_not_c2_osr_compilable();
826 return false;
827 }
828
829 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
830 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
831 if (comp_level == CompLevel_all) {
832 set_not_c1_osr_compilable();
833 set_not_c2_osr_compilable();
834 } else {
835 if (is_c1_compile(comp_level))
836 set_not_c1_osr_compilable();
837 if (is_c2_compile(comp_level))
838 set_not_c2_osr_compilable();
839 }
840 CompilationPolicy::policy()->disable_compilation(this);
841 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
842 }
843
844 // Revert to using the interpreter and clear out the nmethod
845 void Method::clear_code() {
846
847 // this may be NULL if c2i adapters have not been made yet
848 // Only should happen at allocate time.
849 if (_adapter == NULL) {
850 _from_compiled_entry = NULL;
851 } else {
852 _from_compiled_entry = _adapter->get_c2i_entry();
853 }
854 OrderAccess::storestore();
855 _from_interpreted_entry = _i2i_entry;
856 OrderAccess::storestore();
857 _code = NULL;
858 }
859
860 // Called by class data sharing to remove any entry points (which are not shared)
861 void Method::unlink_method() {
862 _code = NULL;
863 _i2i_entry = NULL;
864 _from_interpreted_entry = NULL;
865 if (is_native()) {
866 *native_function_addr() = NULL;
867 set_signature_handler(NULL);
868 }
869 NOT_PRODUCT(set_compiled_invocation_count(0);)
870 _adapter = NULL;
871 _from_compiled_entry = NULL;
872
873 // In case of DumpSharedSpaces, _method_data should always be NULL.
874 //
875 // During runtime (!DumpSharedSpaces), when we are cleaning a
876 // shared class that failed to load, this->link_method() may
877 // have already been called (before an exception happened), so
878 // this->_method_data may not be NULL.
879 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?");
880
881 set_method_data(NULL);
882 clear_method_counters();
883 }
884
885 // Called when the method_holder is getting linked. Setup entrypoints so the method
886 // is ready to be called from interpreter, compiler, and vtables.
887 void Method::link_method(methodHandle h_method, TRAPS) {
888 // If the code cache is full, we may reenter this function for the
889 // leftover methods that weren't linked.
890 if (_i2i_entry != NULL) return;
891
892 assert(_adapter == NULL, "init'd to NULL" );
893 assert( _code == NULL, "nothing compiled yet" );
894
895 // Setup interpreter entrypoint
896 assert(this == h_method(), "wrong h_method()" );
897 address entry = Interpreter::entry_for_method(h_method);
898 assert(entry != NULL, "interpreter entry must be non-null");
899 // Sets both _i2i_entry and _from_interpreted_entry
900 set_interpreter_entry(entry);
901
902 // Don't overwrite already registered native entries.
903 if (is_native() && !has_native_function()) {
904 set_native_function(
905 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
906 !native_bind_event_is_interesting);
907 }
908
909 // Setup compiler entrypoint. This is made eagerly, so we do not need
910 // special handling of vtables. An alternative is to make adapters more
911 // lazily by calling make_adapter() from from_compiled_entry() for the
912 // normal calls. For vtable calls life gets more complicated. When a
913 // call-site goes mega-morphic we need adapters in all methods which can be
914 // called from the vtable. We need adapters on such methods that get loaded
915 // later. Ditto for mega-morphic itable calls. If this proves to be a
916 // problem we'll make these lazily later.
917 (void) make_adapters(h_method, CHECK);
918
919 // ONLY USE the h_method now as make_adapter may have blocked
920
921 }
922
923 address Method::make_adapters(methodHandle mh, TRAPS) {
924 // Adapters for compiled code are made eagerly here. They are fairly
925 // small (generally < 100 bytes) and quick to make (and cached and shared)
926 // so making them eagerly shouldn't be too expensive.
927 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
928 if (adapter == NULL ) {
929 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
930 }
931
932 mh->set_adapter_entry(adapter);
933 mh->_from_compiled_entry = adapter->get_c2i_entry();
934 return adapter->get_c2i_entry();
935 }
936
937 void Method::restore_unshareable_info(TRAPS) {
938 // Since restore_unshareable_info can be called more than once for a method, don't
939 // redo any work. If this field is restored, there is nothing to do.
940 if (_from_compiled_entry == NULL) {
941 // restore method's vtable by calling a virtual function
942 restore_vtable();
943
944 methodHandle mh(THREAD, this);
945 link_method(mh, CHECK);
946 }
947 }
948
949
950 // The verified_code_entry() must be called when a invoke is resolved
951 // on this method.
952
953 // It returns the compiled code entry point, after asserting not null.
954 // This function is called after potential safepoints so that nmethod
955 // or adapter that it points to is still live and valid.
956 // This function must not hit a safepoint!
957 address Method::verified_code_entry() {
958 debug_only(No_Safepoint_Verifier nsv;)
959 assert(_from_compiled_entry != NULL, "must be set");
960 return _from_compiled_entry;
961 }
962
963 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
964 // (could be racing a deopt).
965 // Not inline to avoid circular ref.
966 bool Method::check_code() const {
967 // cached in a register or local. There's a race on the value of the field.
968 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
969 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
970 }
971
972 // Install compiled code. Instantly it can execute.
973 void Method::set_code(methodHandle mh, nmethod *code) {
974 assert( code, "use clear_code to remove code" );
975 assert( mh->check_code(), "" );
976
977 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
978
979 // These writes must happen in this order, because the interpreter will
980 // directly jump to from_interpreted_entry which jumps to an i2c adapter
981 // which jumps to _from_compiled_entry.
982 mh->_code = code; // Assign before allowing compiled code to exec
983
984 int comp_level = code->comp_level();
985 // In theory there could be a race here. In practice it is unlikely
986 // and not worth worrying about.
987 if (comp_level > mh->highest_comp_level()) {
988 mh->set_highest_comp_level(comp_level);
989 }
990
991 OrderAccess::storestore();
992 #ifdef SHARK
993 mh->_from_interpreted_entry = code->insts_begin();
994 #else //!SHARK
995 mh->_from_compiled_entry = code->verified_entry_point();
996 OrderAccess::storestore();
997 // Instantly compiled code can execute.
998 if (!mh->is_method_handle_intrinsic())
999 mh->_from_interpreted_entry = mh->get_i2c_entry();
1000 #endif //!SHARK
1001 }
1002
1003
1004 bool Method::is_overridden_in(Klass* k) const {
1005 InstanceKlass* ik = InstanceKlass::cast(k);
1006
1007 if (ik->is_interface()) return false;
1008
1009 // If method is an interface, we skip it - except if it
1010 // is a miranda method
1011 if (method_holder()->is_interface()) {
1012 // Check that method is not a miranda method
1013 if (ik->lookup_method(name(), signature()) == NULL) {
1014 // No implementation exist - so miranda method
1015 return false;
1016 }
1017 return true;
1018 }
1019
1020 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1021 assert(ik->vtable() != NULL, "vtable should exist");
1022 if (!has_vtable_index()) {
1023 return false;
1024 } else {
1025 Method* vt_m = ik->method_at_vtable(vtable_index());
1026 return vt_m != this;
1027 }
1028 }
1029
1030
1031 // give advice about whether this Method* should be cached or not
1032 bool Method::should_not_be_cached() const {
1033 if (is_old()) {
1034 // This method has been redefined. It is either EMCP or obsolete
1035 // and we don't want to cache it because that would pin the method
1036 // down and prevent it from being collectible if and when it
1037 // finishes executing.
1038 return true;
1039 }
1040
1041 // caching this method should be just fine
1042 return false;
1043 }
1044
1045
1046 /**
1047 * Returns true if this is one of the specially treated methods for
1048 * security related stack walks (like Reflection.getCallerClass).
1049 */
1050 bool Method::is_ignored_by_security_stack_walk() const {
1051 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection;
1052
1053 if (intrinsic_id() == vmIntrinsics::_invoke) {
1054 // This is Method.invoke() -- ignore it
1055 return true;
1056 }
1057 if (use_new_reflection &&
1058 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1059 // This is an auxilary frame -- ignore it
1060 return true;
1061 }
1062 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1063 // This is an internal adapter frame for method handles -- ignore it
1064 return true;
1065 }
1066 return false;
1067 }
1068
1069
1070 // Constant pool structure for invoke methods:
1071 enum {
1072 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1073 _imcp_invoke_signature, // utf8: (variable Symbol*)
1074 _imcp_limit
1075 };
1076
1077 // Test if this method is an MH adapter frame generated by Java code.
1078 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1079 bool Method::is_compiled_lambda_form() const {
1080 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1081 }
1082
1083 // Test if this method is an internal MH primitive method.
1084 bool Method::is_method_handle_intrinsic() const {
1085 vmIntrinsics::ID iid = intrinsic_id();
1086 return (MethodHandles::is_signature_polymorphic(iid) &&
1087 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1088 }
1089
1090 bool Method::has_member_arg() const {
1091 vmIntrinsics::ID iid = intrinsic_id();
1092 return (MethodHandles::is_signature_polymorphic(iid) &&
1093 MethodHandles::has_member_arg(iid));
1094 }
1095
1096 // Make an instance of a signature-polymorphic internal MH primitive.
1097 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1098 Symbol* signature,
1099 TRAPS) {
1100 ResourceMark rm;
1101 methodHandle empty;
1102
1103 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1104 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1105 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1106 if (TraceMethodHandles) {
1107 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1108 }
1109
1110 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1111 name->increment_refcount();
1112 signature->increment_refcount();
1113
1114 int cp_length = _imcp_limit;
1115 ClassLoaderData* loader_data = holder->class_loader_data();
1116 constantPoolHandle cp;
1117 {
1118 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1119 cp = constantPoolHandle(THREAD, cp_oop);
1120 }
1121 cp->set_pool_holder(InstanceKlass::cast(holder()));
1122 cp->symbol_at_put(_imcp_invoke_name, name);
1123 cp->symbol_at_put(_imcp_invoke_signature, signature);
1124 cp->set_has_preresolution();
1125
1126 // decide on access bits: public or not?
1127 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1128 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1129 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1130 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1131
1132 methodHandle m;
1133 {
1134 InlineTableSizes sizes;
1135 Method* m_oop = Method::allocate(loader_data, 0,
1136 accessFlags_from(flags_bits), &sizes,
1137 ConstMethod::NORMAL, CHECK_(empty));
1138 m = methodHandle(THREAD, m_oop);
1139 }
1140 m->set_constants(cp());
1141 m->set_name_index(_imcp_invoke_name);
1142 m->set_signature_index(_imcp_invoke_signature);
1143 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1144 assert(m->signature() == signature, "");
1145 ResultTypeFinder rtf(signature);
1146 m->constMethod()->set_result_type(rtf.type());
1147 m->compute_size_of_parameters(THREAD);
1148 m->init_intrinsic_id();
1149 assert(m->is_method_handle_intrinsic(), "");
1150 #ifdef ASSERT
1151 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1152 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1153 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1154 #endif //ASSERT
1155
1156 // Finally, set up its entry points.
1157 assert(m->can_be_statically_bound(), "");
1158 m->set_vtable_index(Method::nonvirtual_vtable_index);
1159 m->link_method(m, CHECK_(empty));
1160
1161 if (TraceMethodHandles && (Verbose || WizardMode))
1162 m->print_on(tty);
1163
1164 return m;
1165 }
1166
1167 Klass* Method::check_non_bcp_klass(Klass* klass) {
1168 if (klass != NULL && klass->class_loader() != NULL) {
1169 if (klass->oop_is_objArray())
1170 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1171 return klass;
1172 }
1173 return NULL;
1174 }
1175
1176
1177 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1178 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1179 // Code below does not work for native methods - they should never get rewritten anyway
1180 assert(!m->is_native(), "cannot rewrite native methods");
1181 // Allocate new Method*
1182 AccessFlags flags = m->access_flags();
1183
1184 ConstMethod* cm = m->constMethod();
1185 int checked_exceptions_len = cm->checked_exceptions_length();
1186 int localvariable_len = cm->localvariable_table_length();
1187 int exception_table_len = cm->exception_table_length();
1188 int method_parameters_len = cm->method_parameters_length();
1189 int method_annotations_len = cm->method_annotations_length();
1190 int parameter_annotations_len = cm->parameter_annotations_length();
1191 int type_annotations_len = cm->type_annotations_length();
1192 int default_annotations_len = cm->default_annotations_length();
1193
1194 InlineTableSizes sizes(
1195 localvariable_len,
1196 new_compressed_linenumber_size,
1197 exception_table_len,
1198 checked_exceptions_len,
1199 method_parameters_len,
1200 cm->generic_signature_index(),
1201 method_annotations_len,
1202 parameter_annotations_len,
1203 type_annotations_len,
1204 default_annotations_len,
1205 0);
1206
1207 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1208 Method* newm_oop = Method::allocate(loader_data,
1209 new_code_length,
1210 flags,
1211 &sizes,
1212 m->method_type(),
1213 CHECK_(methodHandle()));
1214 methodHandle newm (THREAD, newm_oop);
1215 int new_method_size = newm->method_size();
1216
1217 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1218 ConstMethod* newcm = newm->constMethod();
1219 int new_const_method_size = newm->constMethod()->size();
1220
1221 memcpy(newm(), m(), sizeof(Method));
1222
1223 // Create shallow copy of ConstMethod.
1224 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1225
1226 // Reset correct method/const method, method size, and parameter info
1227 newm->set_constMethod(newcm);
1228 newm->constMethod()->set_code_size(new_code_length);
1229 newm->constMethod()->set_constMethod_size(new_const_method_size);
1230 newm->set_method_size(new_method_size);
1231 assert(newm->code_size() == new_code_length, "check");
1232 assert(newm->method_parameters_length() == method_parameters_len, "check");
1233 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1234 assert(newm->exception_table_length() == exception_table_len, "check");
1235 assert(newm->localvariable_table_length() == localvariable_len, "check");
1236 // Copy new byte codes
1237 memcpy(newm->code_base(), new_code, new_code_length);
1238 // Copy line number table
1239 if (new_compressed_linenumber_size > 0) {
1240 memcpy(newm->compressed_linenumber_table(),
1241 new_compressed_linenumber_table,
1242 new_compressed_linenumber_size);
1243 }
1244 // Copy method_parameters
1245 if (method_parameters_len > 0) {
1246 memcpy(newm->method_parameters_start(),
1247 m->method_parameters_start(),
1248 method_parameters_len * sizeof(MethodParametersElement));
1249 }
1250 // Copy checked_exceptions
1251 if (checked_exceptions_len > 0) {
1252 memcpy(newm->checked_exceptions_start(),
1253 m->checked_exceptions_start(),
1254 checked_exceptions_len * sizeof(CheckedExceptionElement));
1255 }
1256 // Copy exception table
1257 if (exception_table_len > 0) {
1258 memcpy(newm->exception_table_start(),
1259 m->exception_table_start(),
1260 exception_table_len * sizeof(ExceptionTableElement));
1261 }
1262 // Copy local variable number table
1263 if (localvariable_len > 0) {
1264 memcpy(newm->localvariable_table_start(),
1265 m->localvariable_table_start(),
1266 localvariable_len * sizeof(LocalVariableTableElement));
1267 }
1268 // Copy stackmap table
1269 if (m->has_stackmap_table()) {
1270 int code_attribute_length = m->stackmap_data()->length();
1271 Array<u1>* stackmap_data =
1272 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1273 memcpy((void*)stackmap_data->adr_at(0),
1274 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1275 newm->set_stackmap_data(stackmap_data);
1276 }
1277
1278 // copy annotations over to new method
1279 newcm->copy_annotations_from(cm);
1280 return newm;
1281 }
1282
1283 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1284 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1285 // because we are not loading from core libraries
1286 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1287 // which does not use the class default class loader so we check for its loader here
1288 InstanceKlass* ik = InstanceKlass::cast(holder);
1289 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) {
1290 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1291 }
1292
1293 // see if the klass name is well-known:
1294 Symbol* klass_name = ik->name();
1295 return vmSymbols::find_sid(klass_name);
1296 }
1297
1298 void Method::init_intrinsic_id() {
1299 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1300 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1301 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1302 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1303
1304 // the klass name is well-known:
1305 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1306 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1307
1308 // ditto for method and signature:
1309 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1310 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1311 && name_id == vmSymbols::NO_SID)
1312 return;
1313 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1314 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1315 && sig_id == vmSymbols::NO_SID) return;
1316 jshort flags = access_flags().as_short();
1317
1318 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1319 if (id != vmIntrinsics::_none) {
1320 set_intrinsic_id(id);
1321 return;
1322 }
1323
1324 // A few slightly irregular cases:
1325 switch (klass_id) {
1326 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1327 // Second chance: check in regular Math.
1328 switch (name_id) {
1329 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1330 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1331 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1332 // pretend it is the corresponding method in the non-strict class:
1333 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1334 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1335 break;
1336 }
1337 break;
1338
1339 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1340 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1341 if (!is_native()) break;
1342 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1343 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1344 id = vmIntrinsics::_none;
1345 break;
1346 }
1347
1348 if (id != vmIntrinsics::_none) {
1349 // Set up its iid. It is an alias method.
1350 set_intrinsic_id(id);
1351 return;
1352 }
1353 }
1354
1355 // These two methods are static since a GC may move the Method
1356 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1357 if (THREAD->is_Compiler_thread()) {
1358 // There is nothing useful this routine can do from within the Compile thread.
1359 // Hopefully, the signature contains only well-known classes.
1360 // We could scan for this and return true/false, but the caller won't care.
1361 return false;
1362 }
1363 bool sig_is_loaded = true;
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.is_object()) {
1370 Symbol* sym = ss.as_symbol(CHECK_(false));
1371 Symbol* name = sym;
1372 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1373 protection_domain, THREAD);
1374 // We are loading classes eagerly. If a ClassNotFoundException or
1375 // a LinkageError was generated, be sure to ignore it.
1376 if (HAS_PENDING_EXCEPTION) {
1377 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1378 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1379 CLEAR_PENDING_EXCEPTION;
1380 } else {
1381 return false;
1382 }
1383 }
1384 if( klass == NULL) { sig_is_loaded = false; }
1385 }
1386 }
1387 return sig_is_loaded;
1388 }
1389
1390 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1391 Handle class_loader(THREAD, m->method_holder()->class_loader());
1392 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1393 ResourceMark rm(THREAD);
1394 Symbol* signature = m->signature();
1395 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1396 if (ss.type() == T_OBJECT) {
1397 Symbol* name = ss.as_symbol_or_null();
1398 if (name == NULL) return true;
1399 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1400 if (klass == NULL) return true;
1401 }
1402 }
1403 return false;
1404 }
1405
1406 // Exposed so field engineers can debug VM
1407 void Method::print_short_name(outputStream* st) {
1408 ResourceMark rm;
1409 #ifdef PRODUCT
1410 st->print(" %s::", method_holder()->external_name());
1411 #else
1412 st->print(" %s::", method_holder()->internal_name());
1413 #endif
1414 name()->print_symbol_on(st);
1415 if (WizardMode) signature()->print_symbol_on(st);
1416 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1417 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1418 }
1419
1420 // Comparer for sorting an object array containing
1421 // Method*s.
1422 static int method_comparator(Method* a, Method* b) {
1423 return a->name()->fast_compare(b->name());
1424 }
1425
1426 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1427 // default_methods also uses this without the ordering for fast find_method
1428 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1429 int length = methods->length();
1430 if (length > 1) {
1431 {
1432 No_Safepoint_Verifier nsv;
1433 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1434 }
1435 // Reset method ordering
1436 if (set_idnums) {
1437 for (int i = 0; i < length; i++) {
1438 Method* m = methods->at(i);
1439 m->set_method_idnum(i);
1440 m->set_orig_method_idnum(i);
1441 }
1442 }
1443 }
1444 }
1445
1446 //-----------------------------------------------------------------------------------
1447 // Non-product code unless JVM/TI needs it
1448
1449 #if !defined(PRODUCT) || INCLUDE_JVMTI
1450 class SignatureTypePrinter : public SignatureTypeNames {
1451 private:
1452 outputStream* _st;
1453 bool _use_separator;
1454
1455 void type_name(const char* name) {
1456 if (_use_separator) _st->print(", ");
1457 _st->print("%s", name);
1458 _use_separator = true;
1459 }
1460
1461 public:
1462 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1463 _st = st;
1464 _use_separator = false;
1465 }
1466
1467 void print_parameters() { _use_separator = false; iterate_parameters(); }
1468 void print_returntype() { _use_separator = false; iterate_returntype(); }
1469 };
1470
1471
1472 void Method::print_name(outputStream* st) {
1473 Thread *thread = Thread::current();
1474 ResourceMark rm(thread);
1475 SignatureTypePrinter sig(signature(), st);
1476 st->print("%s ", is_static() ? "static" : "virtual");
1477 sig.print_returntype();
1478 st->print(" %s.", method_holder()->internal_name());
1479 name()->print_symbol_on(st);
1480 st->print("(");
1481 sig.print_parameters();
1482 st->print(")");
1483 }
1484 #endif // !PRODUCT || INCLUDE_JVMTI
1485
1486
1487 //-----------------------------------------------------------------------------------
1488 // Non-product code
1489
1490 #ifndef PRODUCT
1491 void Method::print_codes_on(outputStream* st) const {
1492 print_codes_on(0, code_size(), st);
1493 }
1494
1495 void Method::print_codes_on(int from, int to, outputStream* st) const {
1496 Thread *thread = Thread::current();
1497 ResourceMark rm(thread);
1498 methodHandle mh (thread, (Method*)this);
1499 BytecodeStream s(mh);
1500 s.set_interval(from, to);
1501 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1502 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1503 }
1504 #endif // not PRODUCT
1505
1506
1507 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1508 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1509 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1510 // as end-of-stream terminator.
1511
1512 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1513 // bci and line number does not compress into single byte.
1514 // Write out escape character and use regular compression for bci and line number.
1515 write_byte((jubyte)0xFF);
1516 write_signed_int(bci_delta);
1517 write_signed_int(line_delta);
1518 }
1519
1520 // See comment in method.hpp which explains why this exists.
1521 #if defined(_M_AMD64) && _MSC_VER >= 1400
1522 #pragma optimize("", off)
1523 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1524 write_pair_inline(bci, line);
1525 }
1526 #pragma optimize("", on)
1527 #endif
1528
1529 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1530 _bci = 0;
1531 _line = 0;
1532 };
1533
1534
1535 bool CompressedLineNumberReadStream::read_pair() {
1536 jubyte next = read_byte();
1537 // Check for terminator
1538 if (next == 0) return false;
1539 if (next == 0xFF) {
1540 // Escape character, regular compression used
1541 _bci += read_signed_int();
1542 _line += read_signed_int();
1543 } else {
1544 // Single byte compression used
1545 _bci += next >> 3;
1546 _line += next & 0x7;
1547 }
1548 return true;
1549 }
1550
1551
1552 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1553 BreakpointInfo* bp = method_holder()->breakpoints();
1554 for (; bp != NULL; bp = bp->next()) {
1555 if (bp->match(this, bci)) {
1556 return bp->orig_bytecode();
1557 }
1558 }
1559 {
1560 ResourceMark rm;
1561 fatal(err_msg("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci));
1562 }
1563 return Bytecodes::_shouldnotreachhere;
1564 }
1565
1566 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1567 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1568 BreakpointInfo* bp = method_holder()->breakpoints();
1569 for (; bp != NULL; bp = bp->next()) {
1570 if (bp->match(this, bci)) {
1571 bp->set_orig_bytecode(code);
1572 // and continue, in case there is more than one
1573 }
1574 }
1575 }
1576
1577 void Method::set_breakpoint(int bci) {
1578 InstanceKlass* ik = method_holder();
1579 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1580 bp->set_next(ik->breakpoints());
1581 ik->set_breakpoints(bp);
1582 // do this last:
1583 bp->set(this);
1584 }
1585
1586 static void clear_matches(Method* m, int bci) {
1587 InstanceKlass* ik = m->method_holder();
1588 BreakpointInfo* prev_bp = NULL;
1589 BreakpointInfo* next_bp;
1590 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1591 next_bp = bp->next();
1592 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1593 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1594 // do this first:
1595 bp->clear(m);
1596 // unhook it
1597 if (prev_bp != NULL)
1598 prev_bp->set_next(next_bp);
1599 else
1600 ik->set_breakpoints(next_bp);
1601 delete bp;
1602 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1603 // at same location. So we have multiple matching (method_index and bci)
1604 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1605 // breakpoint for clear_breakpoint request and keep all other method versions
1606 // BreakpointInfo for future clear_breakpoint request.
1607 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1608 // which is being called when class is unloaded. We delete all the Breakpoint
1609 // information for all versions of method. We may not correctly restore the original
1610 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1611 // so these methods won't be used anymore.
1612 if (bci >= 0) {
1613 break;
1614 }
1615 } else {
1616 // This one is a keeper.
1617 prev_bp = bp;
1618 }
1619 }
1620 }
1621
1622 void Method::clear_breakpoint(int bci) {
1623 assert(bci >= 0, "");
1624 clear_matches(this, bci);
1625 }
1626
1627 void Method::clear_all_breakpoints() {
1628 clear_matches(this, -1);
1629 }
1630
1631
1632 int Method::invocation_count() {
1633 MethodCounters *mcs = method_counters();
1634 if (TieredCompilation) {
1635 MethodData* const mdo = method_data();
1636 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1637 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1638 return InvocationCounter::count_limit;
1639 } else {
1640 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1641 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1642 }
1643 } else {
1644 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1645 }
1646 }
1647
1648 int Method::backedge_count() {
1649 MethodCounters *mcs = method_counters();
1650 if (TieredCompilation) {
1651 MethodData* const mdo = method_data();
1652 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1653 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1654 return InvocationCounter::count_limit;
1655 } else {
1656 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1657 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1658 }
1659 } else {
1660 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1661 }
1662 }
1663
1664 int Method::highest_comp_level() const {
1665 const MethodCounters* mcs = method_counters();
1666 if (mcs != NULL) {
1667 return mcs->highest_comp_level();
1668 } else {
1669 return CompLevel_none;
1670 }
1671 }
1672
1673 int Method::highest_osr_comp_level() const {
1674 const MethodCounters* mcs = method_counters();
1675 if (mcs != NULL) {
1676 return mcs->highest_osr_comp_level();
1677 } else {
1678 return CompLevel_none;
1679 }
1680 }
1681
1682 void Method::set_highest_comp_level(int level) {
1683 MethodCounters* mcs = method_counters();
1684 if (mcs != NULL) {
1685 mcs->set_highest_comp_level(level);
1686 }
1687 }
1688
1689 void Method::set_highest_osr_comp_level(int level) {
1690 MethodCounters* mcs = method_counters();
1691 if (mcs != NULL) {
1692 mcs->set_highest_osr_comp_level(level);
1693 }
1694 }
1695
1696 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1697 _bci = bci;
1698 _name_index = m->name_index();
1699 _signature_index = m->signature_index();
1700 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1701 if (_orig_bytecode == Bytecodes::_breakpoint)
1702 _orig_bytecode = m->orig_bytecode_at(_bci);
1703 _next = NULL;
1704 }
1705
1706 void BreakpointInfo::set(Method* method) {
1707 #ifdef ASSERT
1708 {
1709 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1710 if (code == Bytecodes::_breakpoint)
1711 code = method->orig_bytecode_at(_bci);
1712 assert(orig_bytecode() == code, "original bytecode must be the same");
1713 }
1714 #endif
1715 Thread *thread = Thread::current();
1716 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1717 method->incr_number_of_breakpoints(thread);
1718 SystemDictionary::notice_modification();
1719 {
1720 // Deoptimize all dependents on this method
1721 HandleMark hm(thread);
1722 methodHandle mh(thread, method);
1723 Universe::flush_dependents_on_method(mh);
1724 }
1725 }
1726
1727 void BreakpointInfo::clear(Method* method) {
1728 *method->bcp_from(_bci) = orig_bytecode();
1729 assert(method->number_of_breakpoints() > 0, "must not go negative");
1730 method->decr_number_of_breakpoints(Thread::current());
1731 }
1732
1733 // jmethodID handling
1734
1735 // This is a block allocating object, sort of like JNIHandleBlock, only a
1736 // lot simpler. There aren't many of these, they aren't long, they are rarely
1737 // deleted and so we can do some suboptimal things.
1738 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1739 // never get rid of it.
1740 // It would be nice to be able to parameterize the number of methods for
1741 // the null_class_loader but then we'd have to turn this and ClassLoaderData
1742 // into templates.
1743
1744 // I feel like this brain dead class should exist somewhere in the STL
1745
1746 class JNIMethodBlock : public CHeapObj<mtClass> {
1747 enum { number_of_methods = 8 };
1748
1749 Method* _methods[number_of_methods];
1750 int _top;
1751 JNIMethodBlock* _next;
1752 public:
1753 static Method* const _free_method;
1754
1755 JNIMethodBlock() : _next(NULL), _top(0) {
1756 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method;
1757 }
1758
1759 Method** add_method(Method* m) {
1760 if (_top < number_of_methods) {
1761 // top points to the next free entry.
1762 int i = _top;
1763 _methods[i] = m;
1764 _top++;
1765 return &_methods[i];
1766 } else if (_top == number_of_methods) {
1767 // if the next free entry ran off the block see if there's a free entry
1768 for (int i = 0; i< number_of_methods; i++) {
1769 if (_methods[i] == _free_method) {
1770 _methods[i] = m;
1771 return &_methods[i];
1772 }
1773 }
1774 // Only check each block once for frees. They're very unlikely.
1775 // Increment top past the end of the block.
1776 _top++;
1777 }
1778 // need to allocate a next block.
1779 if (_next == NULL) {
1780 _next = new JNIMethodBlock();
1781 }
1782 return _next->add_method(m);
1783 }
1784
1785 bool contains(Method** m) {
1786 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1787 for (int i = 0; i< number_of_methods; i++) {
1788 if (&(b->_methods[i]) == m) {
1789 return true;
1790 }
1791 }
1792 }
1793 return false; // not found
1794 }
1795
1796 // Doesn't really destroy it, just marks it as free so it can be reused.
1797 void destroy_method(Method** m) {
1798 #ifdef ASSERT
1799 assert(contains(m), "should be a methodID");
1800 #endif // ASSERT
1801 *m = _free_method;
1802 }
1803
1804 // During class unloading the methods are cleared, which is different
1805 // than freed.
1806 void clear_all_methods() {
1807 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1808 for (int i = 0; i< number_of_methods; i++) {
1809 b->_methods[i] = NULL;
1810 }
1811 }
1812 }
1813 #ifndef PRODUCT
1814 int count_methods() {
1815 // count all allocated methods
1816 int count = 0;
1817 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1818 for (int i = 0; i< number_of_methods; i++) {
1819 if (b->_methods[i] != _free_method) count++;
1820 }
1821 }
1822 return count;
1823 }
1824 #endif // PRODUCT
1825 };
1826
1827 // Something that can't be mistaken for an address or a markOop
1828 Method* const JNIMethodBlock::_free_method = (Method*)55;
1829
1830 // Add a method id to the jmethod_ids
1831 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
1832 ClassLoaderData* cld = loader_data;
1833
1834 if (!SafepointSynchronize::is_at_safepoint()) {
1835 // Have to add jmethod_ids() to class loader data thread-safely.
1836 // Also have to add the method to the list safely, which the cld lock
1837 // protects as well.
1838 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1839 if (cld->jmethod_ids() == NULL) {
1840 cld->set_jmethod_ids(new JNIMethodBlock());
1841 }
1842 // jmethodID is a pointer to Method*
1843 return (jmethodID)cld->jmethod_ids()->add_method(m);
1844 } else {
1845 // At safepoint, we are single threaded and can set this.
1846 if (cld->jmethod_ids() == NULL) {
1847 cld->set_jmethod_ids(new JNIMethodBlock());
1848 }
1849 // jmethodID is a pointer to Method*
1850 return (jmethodID)cld->jmethod_ids()->add_method(m);
1851 }
1852 }
1853
1854 // Mark a jmethodID as free. This is called when there is a data race in
1855 // InstanceKlass while creating the jmethodID cache.
1856 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
1857 ClassLoaderData* cld = loader_data;
1858 Method** ptr = (Method**)m;
1859 assert(cld->jmethod_ids() != NULL, "should have method handles");
1860 cld->jmethod_ids()->destroy_method(ptr);
1861 }
1862
1863 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
1864 // Can't assert the method_holder is the same because the new method has the
1865 // scratch method holder.
1866 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
1867 == new_method->method_holder()->class_loader(),
1868 "changing to a different class loader");
1869 // Just change the method in place, jmethodID pointer doesn't change.
1870 *((Method**)jmid) = new_method;
1871 }
1872
1873 bool Method::is_method_id(jmethodID mid) {
1874 Method* m = resolve_jmethod_id(mid);
1875 assert(m != NULL, "should be called with non-null method");
1876 InstanceKlass* ik = m->method_holder();
1877 if (ik == NULL) {
1878 return false;
1879 }
1880 ClassLoaderData* cld = ik->class_loader_data();
1881 if (cld->jmethod_ids() == NULL) return false;
1882 return (cld->jmethod_ids()->contains((Method**)mid));
1883 }
1884
1885 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
1886 if (mid == NULL) return NULL;
1887 if (!Method::is_method_id(mid)) {
1888 return NULL;
1889 }
1890 Method* o = resolve_jmethod_id(mid);
1891 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
1892 return NULL;
1893 }
1894 return o;
1895 };
1896
1897 void Method::set_on_stack(const bool value) {
1898 // Set both the method itself and its constant pool. The constant pool
1899 // on stack means some method referring to it is also on the stack.
1900 constants()->set_on_stack(value);
1901
1902 bool succeeded = _access_flags.set_on_stack(value);
1903 if (value && succeeded) {
1904 MetadataOnStackMark::record(this, Thread::current());
1905 }
1906 }
1907
1908 // Called when the class loader is unloaded to make all methods weak.
1909 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1910 loader_data->jmethod_ids()->clear_all_methods();
1911 }
1912
1913 bool Method::has_method_vptr(const void* ptr) {
1914 Method m;
1915 // This assumes that the vtbl pointer is the first word of a C++ object.
1916 // This assumption is also in universe.cpp patch_klass_vtble
1917 void* vtbl2 = dereference_vptr((const void*)&m);
1918 void* this_vtbl = dereference_vptr(ptr);
1919 return vtbl2 == this_vtbl;
1920 }
1921
1922 // Check that this pointer is valid by checking that the vtbl pointer matches
1923 bool Method::is_valid_method() const {
1924 if (this == NULL) {
1925 return false;
1926 } else if (!is_metaspace_object()) {
1927 return false;
1928 } else {
1929 return has_method_vptr((const void*)this);
1930 }
1931 }
1932
1933 #ifndef PRODUCT
1934 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1935 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1936 }
1937 #endif // PRODUCT
1938
1939
1940 // Printing
1941
1942 #ifndef PRODUCT
1943
1944 void Method::print_on(outputStream* st) const {
1945 ResourceMark rm;
1946 assert(is_method(), "must be method");
1947 st->print_cr("%s", internal_name());
1948 // get the effect of PrintOopAddress, always, for methods:
1949 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this);
1950 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
1951 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants());
1952 constants()->print_value_on(st); st->cr();
1953 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
1954 st->print (" - name: "); name()->print_value_on(st); st->cr();
1955 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
1956 st->print_cr(" - max stack: %d", max_stack());
1957 st->print_cr(" - max locals: %d", max_locals());
1958 st->print_cr(" - size of params: %d", size_of_parameters());
1959 st->print_cr(" - method size: %d", method_size());
1960 if (intrinsic_id() != vmIntrinsics::_none)
1961 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
1962 if (highest_comp_level() != CompLevel_none)
1963 st->print_cr(" - highest level: %d", highest_comp_level());
1964 st->print_cr(" - vtable index: %d", _vtable_index);
1965 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
1966 st->print( " - adapters: ");
1967 AdapterHandlerEntry* a = ((Method*)this)->adapter();
1968 if (a == NULL)
1969 st->print_cr(INTPTR_FORMAT, a);
1970 else
1971 a->print_adapter_on(st);
1972 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
1973 st->print_cr(" - code size: %d", code_size());
1974 if (code_size() != 0) {
1975 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
1976 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
1977 }
1978 if (method_data() != NULL) {
1979 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
1980 }
1981 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
1982 if (checked_exceptions_length() > 0) {
1983 CheckedExceptionElement* table = checked_exceptions_start();
1984 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
1985 if (Verbose) {
1986 for (int i = 0; i < checked_exceptions_length(); i++) {
1987 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
1988 }
1989 }
1990 }
1991 if (has_linenumber_table()) {
1992 u_char* table = compressed_linenumber_table();
1993 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
1994 if (Verbose) {
1995 CompressedLineNumberReadStream stream(table);
1996 while (stream.read_pair()) {
1997 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
1998 }
1999 }
2000 }
2001 st->print_cr(" - localvar length: %d", localvariable_table_length());
2002 if (localvariable_table_length() > 0) {
2003 LocalVariableTableElement* table = localvariable_table_start();
2004 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
2005 if (Verbose) {
2006 for (int i = 0; i < localvariable_table_length(); i++) {
2007 int bci = table[i].start_bci;
2008 int len = table[i].length;
2009 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2010 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2011 int slot = table[i].slot;
2012 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2013 }
2014 }
2015 }
2016 if (code() != NULL) {
2017 st->print (" - compiled code: ");
2018 code()->print_value_on(st);
2019 }
2020 if (is_native()) {
2021 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
2022 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
2023 }
2024 }
2025
2026 #endif //PRODUCT
2027
2028 void Method::print_value_on(outputStream* st) const {
2029 assert(is_method(), "must be method");
2030 st->print("%s", internal_name());
2031 print_address_on(st);
2032 st->print(" ");
2033 name()->print_value_on(st);
2034 st->print(" ");
2035 signature()->print_value_on(st);
2036 st->print(" in ");
2037 method_holder()->print_value_on(st);
2038 if (WizardMode) st->print("#%d", _vtable_index);
2039 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2040 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2041 }
2042
2043 #if INCLUDE_SERVICES
2044 // Size Statistics
2045 void Method::collect_statistics(KlassSizeStats *sz) const {
2046 int mysize = sz->count(this);
2047 sz->_method_bytes += mysize;
2048 sz->_method_all_bytes += mysize;
2049 sz->_rw_bytes += mysize;
2050
2051 if (constMethod()) {
2052 constMethod()->collect_statistics(sz);
2053 }
2054 if (method_data()) {
2055 method_data()->collect_statistics(sz);
2056 }
2057 }
2058 #endif // INCLUDE_SERVICES
2059
2060 // Verification
2061
2062 void Method::verify_on(outputStream* st) {
2063 guarantee(is_method(), "object must be method");
2064 guarantee(constants()->is_constantPool(), "should be constant pool");
2065 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2066 MethodData* md = method_data();
2067 guarantee(md == NULL ||
2068 md->is_methodData(), "should be method data");
2069 }