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/codeCache.hpp"
29 #include "code/debugInfoRec.hpp"
30 #include "gc/shared/collectedHeap.inline.hpp"
31 #include "gc/shared/gcLocker.hpp"
32 #include "gc/shared/generation.hpp"
33 #include "interpreter/bytecodeStream.hpp"
34 #include "interpreter/bytecodeTracer.hpp"
35 #include "interpreter/bytecodes.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "interpreter/oopMapCache.hpp"
38 #include "memory/heapInspection.hpp"
39 #include "memory/metadataFactory.hpp"
40 #include "memory/metaspaceShared.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "oops/constMethod.hpp"
44 #include "oops/method.hpp"
45 #include "oops/methodData.hpp"
46 #include "oops/objArrayOop.inline.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "oops/symbol.hpp"
49 #include "prims/jvmtiExport.hpp"
50 #include "prims/methodHandles.hpp"
51 #include "prims/nativeLookup.hpp"
52 #include "runtime/arguments.hpp"
53 #include "runtime/compilationPolicy.hpp"
54 #include "runtime/frame.inline.hpp"
55 #include "runtime/handles.inline.hpp"
56 #include "runtime/init.hpp"
57 #include "runtime/orderAccess.inline.hpp"
58 #include "runtime/relocator.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/signature.hpp"
61 #include "utilities/quickSort.hpp"
62 #include "utilities/xmlstream.hpp"
63
64 // Implementation of Method
65
66 Method* Method::allocate(ClassLoaderData* loader_data,
67 int byte_code_size,
68 AccessFlags access_flags,
69 InlineTableSizes* sizes,
70 ConstMethod::MethodType method_type,
71 TRAPS) {
72 assert(!access_flags.is_native() || byte_code_size == 0,
73 "native methods should not contain byte codes");
74 ConstMethod* cm = ConstMethod::allocate(loader_data,
75 byte_code_size,
76 sizes,
77 method_type,
78 CHECK_NULL);
79 int size = Method::size(access_flags.is_native());
80 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags);
81 }
82
83 Method::Method(ConstMethod* xconst, AccessFlags access_flags) {
84 NoSafepointVerifier no_safepoint;
85 set_constMethod(xconst);
86 set_access_flags(access_flags);
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 MetadataFactory::free_metadata(loader_data, constMethod());
114 set_constMethod(NULL);
115 MetadataFactory::free_metadata(loader_data, method_data());
116 set_method_data(NULL);
117 MetadataFactory::free_metadata(loader_data, method_counters());
118 clear_method_counters();
119 // The nmethod will be gone when we get here.
120 if (code() != NULL) _code = NULL;
121 }
122
123 address Method::get_i2c_entry() {
124 assert(adapter() != NULL, "must have");
125 return adapter()->get_i2c_entry();
126 }
127
128 address Method::get_c2i_entry() {
129 assert(adapter() != NULL, "must have");
130 return adapter()->get_c2i_entry();
131 }
132
133 address Method::get_c2i_unverified_entry() {
134 assert(adapter() != NULL, "must have");
135 return adapter()->get_c2i_unverified_entry();
136 }
137
138 char* Method::name_and_sig_as_C_string() const {
139 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
140 }
141
142 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
143 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
144 }
145
146 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
147 const char* klass_name = klass->external_name();
148 int klass_name_len = (int)strlen(klass_name);
149 int method_name_len = method_name->utf8_length();
150 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
151 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
152 strcpy(dest, klass_name);
153 dest[klass_name_len] = '.';
154 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
155 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
156 dest[len] = 0;
157 return dest;
158 }
159
160 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
161 Symbol* klass_name = klass->name();
162 klass_name->as_klass_external_name(buf, size);
163 int len = (int)strlen(buf);
164
165 if (len < size - 1) {
166 buf[len++] = '.';
167
168 method_name->as_C_string(&(buf[len]), size - len);
169 len = (int)strlen(buf);
170
171 signature->as_C_string(&(buf[len]), size - len);
172 }
173
174 return buf;
175 }
176
177 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) {
178 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
179 // access exception table
180 ExceptionTable table(mh());
181 int length = table.length();
182 // iterate through all entries sequentially
183 constantPoolHandle pool(THREAD, mh->constants());
184 for (int i = 0; i < length; i ++) {
185 //reacquire the table in case a GC happened
186 ExceptionTable table(mh());
187 int beg_bci = table.start_pc(i);
188 int end_bci = table.end_pc(i);
189 assert(beg_bci <= end_bci, "inconsistent exception table");
190 if (beg_bci <= throw_bci && throw_bci < end_bci) {
191 // exception handler bci range covers throw_bci => investigate further
192 int handler_bci = table.handler_pc(i);
193 int klass_index = table.catch_type_index(i);
194 if (klass_index == 0) {
195 return handler_bci;
196 } else if (ex_klass.is_null()) {
197 return handler_bci;
198 } else {
199 // we know the exception class => get the constraint class
200 // this may require loading of the constraint class; if verification
201 // fails or some other exception occurs, return handler_bci
202 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
203 KlassHandle klass = KlassHandle(THREAD, k);
204 assert(klass.not_null(), "klass not loaded");
205 if (ex_klass->is_subtype_of(klass())) {
206 return handler_bci;
207 }
208 }
209 }
210 }
211
212 return -1;
213 }
214
215 void Method::mask_for(int bci, InterpreterOopMap* mask) {
216
217 Thread* myThread = Thread::current();
218 methodHandle h_this(myThread, this);
219 #if defined(ASSERT) && !INCLUDE_JVMCI
220 bool has_capability = myThread->is_VM_thread() ||
221 myThread->is_ConcurrentGC_thread() ||
222 myThread->is_GC_task_thread();
223
224 if (!has_capability) {
225 if (!VerifyStack && !VerifyLastFrame) {
226 // verify stack calls this outside VM thread
227 warning("oopmap should only be accessed by the "
228 "VM, GC task or CMS threads (or during debugging)");
229 InterpreterOopMap local_mask;
230 method_holder()->mask_for(h_this, bci, &local_mask);
231 local_mask.print();
232 }
233 }
234 #endif
235 method_holder()->mask_for(h_this, bci, mask);
236 return;
237 }
238
239
240 int Method::bci_from(address bcp) const {
241 if (is_native() && bcp == 0) {
242 return 0;
243 }
244 #ifdef ASSERT
245 {
246 ResourceMark rm;
247 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
248 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s",
249 p2i(bcp), name_and_sig_as_C_string());
250 }
251 #endif
252 return bcp - code_base();
253 }
254
255
256 int Method::validate_bci(int bci) const {
257 return (bci == 0 || bci < code_size()) ? bci : -1;
258 }
259
260 // Return bci if it appears to be a valid bcp
261 // Return -1 otherwise.
262 // Used by profiling code, when invalid data is a possibility.
263 // The caller is responsible for validating the Method* itself.
264 int Method::validate_bci_from_bcp(address bcp) const {
265 // keep bci as -1 if not a valid bci
266 int bci = -1;
267 if (bcp == 0 || bcp == code_base()) {
268 // code_size() may return 0 and we allow 0 here
269 // the method may be native
270 bci = 0;
271 } else if (contains(bcp)) {
272 bci = bcp - code_base();
273 }
274 // Assert that if we have dodged any asserts, bci is negative.
275 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
276 return bci;
277 }
278
279 address Method::bcp_from(int bci) const {
280 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci: %d", bci);
281 address bcp = code_base() + bci;
282 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
283 return bcp;
284 }
285
286 address Method::bcp_from(address bcp) const {
287 if (is_native() && bcp == NULL) {
288 return code_base();
289 } else {
290 return bcp;
291 }
292 }
293
294 int Method::size(bool is_native) {
295 // If native, then include pointers for native_function and signature_handler
296 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
297 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
298 return align_metadata_size(header_size() + extra_words);
299 }
300
301
302 Symbol* Method::klass_name() const {
303 return method_holder()->name();
304 }
305
306
307 // Attempt to return method oop to original state. Clear any pointers
308 // (to objects outside the shared spaces). We won't be able to predict
309 // where they should point in a new JVM. Further initialize some
310 // entries now in order allow them to be write protected later.
311
312 void Method::remove_unshareable_info() {
313 unlink_method();
314 }
315
316 void Method::set_vtable_index(int index) {
317 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
318 // At runtime initialize_vtable is rerun as part of link_class_impl()
319 // for a shared class loaded by the non-boot loader to obtain the loader
320 // constraints based on the runtime classloaders' context.
321 return; // don't write into the shared class
322 } else {
323 _vtable_index = index;
324 }
325 }
326
327 void Method::set_itable_index(int index) {
328 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
329 // At runtime initialize_itable is rerun as part of link_class_impl()
330 // for a shared class loaded by the non-boot loader to obtain the loader
331 // constraints based on the runtime classloaders' context. The dumptime
332 // itable index should be the same as the runtime index.
333 assert(_vtable_index == itable_index_max - index,
334 "archived itable index is different from runtime index");
335 return; // don’t write into the shared class
336 } else {
337 _vtable_index = itable_index_max - index;
338 }
339 assert(valid_itable_index(), "");
340 }
341
342
343
344 bool Method::was_executed_more_than(int n) {
345 // Invocation counter is reset when the Method* is compiled.
346 // If the method has compiled code we therefore assume it has
347 // be excuted more than n times.
348 if (is_accessor() || is_empty_method() || (code() != NULL)) {
349 // interpreter doesn't bump invocation counter of trivial methods
350 // compiler does not bump invocation counter of compiled methods
351 return true;
352 }
353 else if ((method_counters() != NULL &&
354 method_counters()->invocation_counter()->carry()) ||
355 (method_data() != NULL &&
356 method_data()->invocation_counter()->carry())) {
357 // The carry bit is set when the counter overflows and causes
358 // a compilation to occur. We don't know how many times
359 // the counter has been reset, so we simply assume it has
360 // been executed more than n times.
361 return true;
362 } else {
363 return invocation_count() > n;
364 }
365 }
366
367 void Method::print_invocation_count() {
368 if (is_static()) tty->print("static ");
369 if (is_final()) tty->print("final ");
370 if (is_synchronized()) tty->print("synchronized ");
371 if (is_native()) tty->print("native ");
372 tty->print("%s::", method_holder()->external_name());
373 name()->print_symbol_on(tty);
374 signature()->print_symbol_on(tty);
375
376 if (WizardMode) {
377 // dump the size of the byte codes
378 tty->print(" {%d}", code_size());
379 }
380 tty->cr();
381
382 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
383 tty->print_cr (" invocation_counter: %8d ", invocation_count());
384 tty->print_cr (" backedge_counter: %8d ", backedge_count());
385 #ifndef PRODUCT
386 if (CountCompiledCalls) {
387 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
388 }
389 #endif
390 }
391
392 // Build a MethodData* object to hold information about this method
393 // collected in the interpreter.
394 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) {
395 // Do not profile the method if metaspace has hit an OOM previously
396 // allocating profiling data. Callers clear pending exception so don't
397 // add one here.
398 if (ClassLoaderDataGraph::has_metaspace_oom()) {
399 return;
400 }
401
402 // Grab a lock here to prevent multiple
403 // MethodData*s from being created.
404 MutexLocker ml(MethodData_lock, THREAD);
405 if (method->method_data() == NULL) {
406 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
407 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
408 if (HAS_PENDING_EXCEPTION) {
409 CompileBroker::log_metaspace_failure();
410 ClassLoaderDataGraph::set_metaspace_oom(true);
411 return; // return the exception (which is cleared)
412 }
413
414 method->set_method_data(method_data);
415 if (PrintMethodData && (Verbose || WizardMode)) {
416 ResourceMark rm(THREAD);
417 tty->print("build_interpreter_method_data for ");
418 method->print_name(tty);
419 tty->cr();
420 // At the end of the run, the MDO, full of data, will be dumped.
421 }
422 }
423 }
424
425 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
426 // Do not profile the method if metaspace has hit an OOM previously
427 if (ClassLoaderDataGraph::has_metaspace_oom()) {
428 return NULL;
429 }
430
431 methodHandle mh(m);
432 MethodCounters* counters = MethodCounters::allocate(mh, THREAD);
433 if (HAS_PENDING_EXCEPTION) {
434 CompileBroker::log_metaspace_failure();
435 ClassLoaderDataGraph::set_metaspace_oom(true);
436 return NULL; // return the exception (which is cleared)
437 }
438 if (!mh->init_method_counters(counters)) {
439 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
440 }
441
442 if (LogTouchedMethods) {
443 mh->log_touched(CHECK_NULL);
444 }
445
446 return mh->method_counters();
447 }
448
449 void Method::cleanup_inline_caches() {
450 // The current system doesn't use inline caches in the interpreter
451 // => nothing to do (keep this method around for future use)
452 }
453
454
455 int Method::extra_stack_words() {
456 // not an inline function, to avoid a header dependency on Interpreter
457 return extra_stack_entries() * Interpreter::stackElementSize;
458 }
459
460
461 void Method::compute_size_of_parameters(Thread *thread) {
462 ArgumentSizeComputer asc(signature());
463 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
464 }
465
466 BasicType Method::result_type() const {
467 ResultTypeFinder rtf(signature());
468 return rtf.type();
469 }
470
471
472 bool Method::is_empty_method() const {
473 return code_size() == 1
474 && *code_base() == Bytecodes::_return;
475 }
476
477
478 bool Method::is_vanilla_constructor() const {
479 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
480 // which only calls the superclass vanilla constructor and possibly does stores of
481 // zero constants to local fields:
482 //
483 // aload_0
484 // invokespecial
485 // indexbyte1
486 // indexbyte2
487 //
488 // followed by an (optional) sequence of:
489 //
490 // aload_0
491 // aconst_null / iconst_0 / fconst_0 / dconst_0
492 // putfield
493 // indexbyte1
494 // indexbyte2
495 //
496 // followed by:
497 //
498 // return
499
500 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
501 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
502 int size = code_size();
503 // Check if size match
504 if (size == 0 || size % 5 != 0) return false;
505 address cb = code_base();
506 int last = size - 1;
507 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
508 // Does not call superclass default constructor
509 return false;
510 }
511 // Check optional sequence
512 for (int i = 4; i < last; i += 5) {
513 if (cb[i] != Bytecodes::_aload_0) return false;
514 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
515 if (cb[i+2] != Bytecodes::_putfield) return false;
516 }
517 return true;
518 }
519
520
521 bool Method::compute_has_loops_flag() {
522 BytecodeStream bcs(this);
523 Bytecodes::Code bc;
524
525 while ((bc = bcs.next()) >= 0) {
526 switch( bc ) {
527 case Bytecodes::_ifeq:
528 case Bytecodes::_ifnull:
529 case Bytecodes::_iflt:
530 case Bytecodes::_ifle:
531 case Bytecodes::_ifne:
532 case Bytecodes::_ifnonnull:
533 case Bytecodes::_ifgt:
534 case Bytecodes::_ifge:
535 case Bytecodes::_if_icmpeq:
536 case Bytecodes::_if_icmpne:
537 case Bytecodes::_if_icmplt:
538 case Bytecodes::_if_icmpgt:
539 case Bytecodes::_if_icmple:
540 case Bytecodes::_if_icmpge:
541 case Bytecodes::_if_acmpeq:
542 case Bytecodes::_if_acmpne:
543 case Bytecodes::_goto:
544 case Bytecodes::_jsr:
545 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
546 break;
547
548 case Bytecodes::_goto_w:
549 case Bytecodes::_jsr_w:
550 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
551 break;
552 }
553 }
554 _access_flags.set_loops_flag_init();
555 return _access_flags.has_loops();
556 }
557
558 bool Method::is_final_method(AccessFlags class_access_flags) const {
559 // or "does_not_require_vtable_entry"
560 // default method or overpass can occur, is not final (reuses vtable entry)
561 // private methods get vtable entries for backward class compatibility.
562 if (is_overpass() || is_default_method()) return false;
563 return is_final() || class_access_flags.is_final();
564 }
565
566 bool Method::is_final_method() const {
567 return is_final_method(method_holder()->access_flags());
568 }
569
570 bool Method::is_default_method() const {
571 if (method_holder() != NULL &&
572 method_holder()->is_interface() &&
573 !is_abstract()) {
574 return true;
575 } else {
576 return false;
577 }
578 }
579
580 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
581 if (is_final_method(class_access_flags)) return true;
582 #ifdef ASSERT
583 ResourceMark rm;
584 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
585 if (class_access_flags.is_interface()) {
586 assert(is_nonv == is_static(), "is_nonv=%s", name_and_sig_as_C_string());
587 }
588 #endif
589 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
590 return vtable_index() == nonvirtual_vtable_index;
591 }
592
593 bool Method::can_be_statically_bound() const {
594 return can_be_statically_bound(method_holder()->access_flags());
595 }
596
597 bool Method::is_accessor() const {
598 return is_getter() || is_setter();
599 }
600
601 bool Method::is_getter() const {
602 if (code_size() != 5) return false;
603 if (size_of_parameters() != 1) return false;
604 if (java_code_at(0) != Bytecodes::_aload_0) return false;
605 if (java_code_at(1) != Bytecodes::_getfield) return false;
606 switch (java_code_at(4)) {
607 case Bytecodes::_ireturn:
608 case Bytecodes::_lreturn:
609 case Bytecodes::_freturn:
610 case Bytecodes::_dreturn:
611 case Bytecodes::_areturn:
612 break;
613 default:
614 return false;
615 }
616 return true;
617 }
618
619 bool Method::is_setter() const {
620 if (code_size() != 6) return false;
621 if (java_code_at(0) != Bytecodes::_aload_0) return false;
622 switch (java_code_at(1)) {
623 case Bytecodes::_iload_1:
624 case Bytecodes::_aload_1:
625 case Bytecodes::_fload_1:
626 if (size_of_parameters() != 2) return false;
627 break;
628 case Bytecodes::_dload_1:
629 case Bytecodes::_lload_1:
630 if (size_of_parameters() != 3) return false;
631 break;
632 default:
633 return false;
634 }
635 if (java_code_at(2) != Bytecodes::_putfield) return false;
636 if (java_code_at(5) != Bytecodes::_return) return false;
637 return true;
638 }
639
640 bool Method::is_constant_getter() const {
641 int last_index = code_size() - 1;
642 // Check if the first 1-3 bytecodes are a constant push
643 // and the last bytecode is a return.
644 return (2 <= code_size() && code_size() <= 4 &&
645 Bytecodes::is_const(java_code_at(0)) &&
646 Bytecodes::length_for(java_code_at(0)) == last_index &&
647 Bytecodes::is_return(java_code_at(last_index)));
648 }
649
650 bool Method::is_initializer() const {
651 return is_object_initializer() || is_static_initializer();
652 }
653
654 bool Method::has_valid_initializer_flags() const {
655 return (is_static() ||
656 method_holder()->major_version() < 51);
657 }
658
659 bool Method::is_static_initializer() const {
660 // For classfiles version 51 or greater, ensure that the clinit method is
661 // static. Non-static methods with the name "<clinit>" are not static
662 // initializers. (older classfiles exempted for backward compatibility)
663 return name() == vmSymbols::class_initializer_name() &&
664 has_valid_initializer_flags();
665 }
666
667 bool Method::is_object_initializer() const {
668 return name() == vmSymbols::object_initializer_name();
669 }
670
671 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
672 int length = method->checked_exceptions_length();
673 if (length == 0) { // common case
674 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
675 } else {
676 methodHandle h_this(THREAD, method);
677 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
678 objArrayHandle mirrors (THREAD, m_oop);
679 for (int i = 0; i < length; i++) {
680 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
681 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
682 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
683 mirrors->obj_at_put(i, k->java_mirror());
684 }
685 return mirrors;
686 }
687 };
688
689
690 int Method::line_number_from_bci(int bci) const {
691 if (bci == SynchronizationEntryBCI) bci = 0;
692 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
693 int best_bci = 0;
694 int best_line = -1;
695
696 if (has_linenumber_table()) {
697 // The line numbers are a short array of 2-tuples [start_pc, line_number].
698 // Not necessarily sorted and not necessarily one-to-one.
699 CompressedLineNumberReadStream stream(compressed_linenumber_table());
700 while (stream.read_pair()) {
701 if (stream.bci() == bci) {
702 // perfect match
703 return stream.line();
704 } else {
705 // update best_bci/line
706 if (stream.bci() < bci && stream.bci() >= best_bci) {
707 best_bci = stream.bci();
708 best_line = stream.line();
709 }
710 }
711 }
712 }
713 return best_line;
714 }
715
716
717 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
718 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
719 Thread *thread = Thread::current();
720 Symbol* klass_name = constants()->klass_name_at(klass_index);
721 Handle loader(thread, method_holder()->class_loader());
722 Handle prot (thread, method_holder()->protection_domain());
723 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
724 } else {
725 return true;
726 }
727 }
728
729
730 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
731 int klass_index = constants()->klass_ref_index_at(refinfo_index);
732 if (must_be_resolved) {
733 // Make sure klass is resolved in constantpool.
734 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
735 }
736 return is_klass_loaded_by_klass_index(klass_index);
737 }
738
739
740 void Method::set_native_function(address function, bool post_event_flag) {
741 assert(function != NULL, "use clear_native_function to unregister natives");
742 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
743 address* native_function = native_function_addr();
744
745 // We can see racers trying to place the same native function into place. Once
746 // is plenty.
747 address current = *native_function;
748 if (current == function) return;
749 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
750 function != NULL) {
751 // native_method_throw_unsatisfied_link_error_entry() should only
752 // be passed when post_event_flag is false.
753 assert(function !=
754 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
755 "post_event_flag mis-match");
756
757 // post the bind event, and possible change the bind function
758 JvmtiExport::post_native_method_bind(this, &function);
759 }
760 *native_function = function;
761 // This function can be called more than once. We must make sure that we always
762 // use the latest registered method -> check if a stub already has been generated.
763 // If so, we have to make it not_entrant.
764 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
765 if (nm != NULL) {
766 nm->make_not_entrant();
767 }
768 }
769
770
771 bool Method::has_native_function() const {
772 if (is_method_handle_intrinsic())
773 return false; // special-cased in SharedRuntime::generate_native_wrapper
774 address func = native_function();
775 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
776 }
777
778
779 void Method::clear_native_function() {
780 // Note: is_method_handle_intrinsic() is allowed here.
781 set_native_function(
782 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
783 !native_bind_event_is_interesting);
784 clear_code();
785 }
786
787 address Method::critical_native_function() {
788 methodHandle mh(this);
789 return NativeLookup::lookup_critical_entry(mh);
790 }
791
792
793 void Method::set_signature_handler(address handler) {
794 address* signature_handler = signature_handler_addr();
795 *signature_handler = handler;
796 }
797
798
799 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
800 if (PrintCompilation && report) {
801 ttyLocker ttyl;
802 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
803 if (comp_level == CompLevel_all) {
804 tty->print("all levels ");
805 } else {
806 tty->print("levels ");
807 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
808 tty->print("%d ", i);
809 }
810 }
811 this->print_short_name(tty);
812 int size = this->code_size();
813 if (size > 0) {
814 tty->print(" (%d bytes)", size);
815 }
816 if (reason != NULL) {
817 tty->print(" %s", reason);
818 }
819 tty->cr();
820 }
821 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
822 ttyLocker ttyl;
823 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
824 os::current_thread_id(), is_osr, comp_level);
825 if (reason != NULL) {
826 xtty->print(" reason=\'%s\'", reason);
827 }
828 xtty->method(this);
829 xtty->stamp();
830 xtty->end_elem();
831 }
832 }
833
834 bool Method::is_always_compilable() const {
835 // Generated adapters must be compiled
836 if (is_method_handle_intrinsic() && is_synthetic()) {
837 assert(!is_not_c1_compilable(), "sanity check");
838 assert(!is_not_c2_compilable(), "sanity check");
839 return true;
840 }
841
842 return false;
843 }
844
845 bool Method::is_not_compilable(int comp_level) const {
846 if (number_of_breakpoints() > 0)
847 return true;
848 if (is_always_compilable())
849 return false;
850 if (comp_level == CompLevel_any)
851 return is_not_c1_compilable() || is_not_c2_compilable();
852 if (is_c1_compile(comp_level))
853 return is_not_c1_compilable();
854 if (is_c2_compile(comp_level))
855 return is_not_c2_compilable();
856 return false;
857 }
858
859 // call this when compiler finds that this method is not compilable
860 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
861 if (is_always_compilable()) {
862 // Don't mark a method which should be always compilable
863 return;
864 }
865 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
866 if (comp_level == CompLevel_all) {
867 set_not_c1_compilable();
868 set_not_c2_compilable();
869 } else {
870 if (is_c1_compile(comp_level))
871 set_not_c1_compilable();
872 if (is_c2_compile(comp_level))
873 set_not_c2_compilable();
874 }
875 CompilationPolicy::policy()->disable_compilation(this);
876 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
877 }
878
879 bool Method::is_not_osr_compilable(int comp_level) const {
880 if (is_not_compilable(comp_level))
881 return true;
882 if (comp_level == CompLevel_any)
883 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
884 if (is_c1_compile(comp_level))
885 return is_not_c1_osr_compilable();
886 if (is_c2_compile(comp_level))
887 return is_not_c2_osr_compilable();
888 return false;
889 }
890
891 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
892 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
893 if (comp_level == CompLevel_all) {
894 set_not_c1_osr_compilable();
895 set_not_c2_osr_compilable();
896 } else {
897 if (is_c1_compile(comp_level))
898 set_not_c1_osr_compilable();
899 if (is_c2_compile(comp_level))
900 set_not_c2_osr_compilable();
901 }
902 CompilationPolicy::policy()->disable_compilation(this);
903 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
904 }
905
906 // Revert to using the interpreter and clear out the nmethod
907 void Method::clear_code() {
908
909 // this may be NULL if c2i adapters have not been made yet
910 // Only should happen at allocate time.
911 if (adapter() == NULL) {
912 _from_compiled_entry = NULL;
913 } else {
914 _from_compiled_entry = adapter()->get_c2i_entry();
915 }
916 OrderAccess::storestore();
917 _from_interpreted_entry = _i2i_entry;
918 OrderAccess::storestore();
919 _code = NULL;
920 }
921
922 #if INCLUDE_CDS
923 // Called by class data sharing to remove any entry points (which are not shared)
924 void Method::unlink_method() {
925 _code = NULL;
926
927 assert(DumpSharedSpaces, "dump time only");
928 // Set the values to what they should be at run time. Note that
929 // this Method can no longer be executed during dump time.
930 _i2i_entry = Interpreter::entry_for_cds_method(this);
931 _from_interpreted_entry = _i2i_entry;
932
933 if (is_native()) {
934 *native_function_addr() = NULL;
935 set_signature_handler(NULL);
936 }
937 NOT_PRODUCT(set_compiled_invocation_count(0);)
938
939 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter();
940 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline());
941 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline();
942 assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time");
943
944
945 // In case of DumpSharedSpaces, _method_data should always be NULL.
946 assert(_method_data == NULL, "unexpected method data?");
947
948 set_method_data(NULL);
949 clear_method_counters();
950 }
951 #endif
952
953 // Called when the method_holder is getting linked. Setup entrypoints so the method
954 // is ready to be called from interpreter, compiler, and vtables.
955 void Method::link_method(const methodHandle& h_method, TRAPS) {
956 // If the code cache is full, we may reenter this function for the
957 // leftover methods that weren't linked.
958 if (is_shared()) {
959 if (adapter() != NULL) return;
960 } else {
961 if (_i2i_entry != NULL) return;
962
963 assert(adapter() == NULL, "init'd to NULL" );
964 }
965 assert( _code == NULL, "nothing compiled yet" );
966
967 // Setup interpreter entrypoint
968 assert(this == h_method(), "wrong h_method()" );
969 address entry;
970
971 if (this->is_shared()) {
972 entry = Interpreter::entry_for_cds_method(h_method);
973 } else {
974 entry = Interpreter::entry_for_method(h_method);
975 }
976 assert(entry != NULL, "interpreter entry must be non-null");
977 if (is_shared()) {
978 assert(entry == _i2i_entry && entry == _from_interpreted_entry,
979 "should be correctly set during dump time");
980 } else {
981 // Sets both _i2i_entry and _from_interpreted_entry
982 set_interpreter_entry(entry);
983 }
984
985 // Don't overwrite already registered native entries.
986 if (is_native() && !has_native_function()) {
987 set_native_function(
988 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
989 !native_bind_event_is_interesting);
990 }
991
992 // Setup compiler entrypoint. This is made eagerly, so we do not need
993 // special handling of vtables. An alternative is to make adapters more
994 // lazily by calling make_adapter() from from_compiled_entry() for the
995 // normal calls. For vtable calls life gets more complicated. When a
996 // call-site goes mega-morphic we need adapters in all methods which can be
997 // called from the vtable. We need adapters on such methods that get loaded
998 // later. Ditto for mega-morphic itable calls. If this proves to be a
999 // problem we'll make these lazily later.
1000 (void) make_adapters(h_method, CHECK);
1001
1002 // ONLY USE the h_method now as make_adapter may have blocked
1003
1004 }
1005
1006 address Method::make_adapters(methodHandle mh, TRAPS) {
1007 // Adapters for compiled code are made eagerly here. They are fairly
1008 // small (generally < 100 bytes) and quick to make (and cached and shared)
1009 // so making them eagerly shouldn't be too expensive.
1010 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1011 if (adapter == NULL ) {
1012 if (!is_init_completed()) {
1013 // Don't throw exceptions during VM initialization because java.lang.* classes
1014 // might not have been initialized, causing problems when constructing the
1015 // Java exception object.
1016 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1017 } else {
1018 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1019 }
1020 }
1021
1022 if (mh->is_shared()) {
1023 assert(mh->adapter() == adapter, "must be");
1024 assert(mh->_from_compiled_entry != NULL, "must be"); // FIXME, the instructions also not NULL
1025 } else {
1026 mh->set_adapter_entry(adapter);
1027 mh->_from_compiled_entry = adapter->get_c2i_entry();
1028 }
1029 return adapter->get_c2i_entry();
1030 }
1031
1032 void Method::restore_unshareable_info(TRAPS) {
1033 // Since restore_unshareable_info can be called more than once for a method, don't
1034 // redo any work. If this field is restored, there is nothing to do.
1035 if (_from_compiled_entry == NULL) {
1036 // restore method's vtable by calling a virtual function
1037 restore_vtable();
1038
1039 methodHandle mh(THREAD, this);
1040 link_method(mh, CHECK);
1041 }
1042 }
1043
1044 volatile address Method::from_compiled_entry_no_trampoline() const {
1045 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
1046 if (code) {
1047 return code->verified_entry_point();
1048 } else {
1049 return adapter()->get_c2i_entry();
1050 }
1051 }
1052
1053 // The verified_code_entry() must be called when a invoke is resolved
1054 // on this method.
1055
1056 // It returns the compiled code entry point, after asserting not null.
1057 // This function is called after potential safepoints so that nmethod
1058 // or adapter that it points to is still live and valid.
1059 // This function must not hit a safepoint!
1060 address Method::verified_code_entry() {
1061 debug_only(NoSafepointVerifier nsv;)
1062 assert(_from_compiled_entry != NULL, "must be set");
1063 return _from_compiled_entry;
1064 }
1065
1066 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1067 // (could be racing a deopt).
1068 // Not inline to avoid circular ref.
1069 bool Method::check_code() const {
1070 // cached in a register or local. There's a race on the value of the field.
1071 CompiledMethod *code = (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code);
1072 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1073 }
1074
1075 // Install compiled code. Instantly it can execute.
1076 void Method::set_code(methodHandle mh, CompiledMethod *code) {
1077 assert( code, "use clear_code to remove code" );
1078 assert( mh->check_code(), "" );
1079
1080 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1081
1082 // These writes must happen in this order, because the interpreter will
1083 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1084 // which jumps to _from_compiled_entry.
1085 mh->_code = code; // Assign before allowing compiled code to exec
1086
1087 int comp_level = code->comp_level();
1088 // In theory there could be a race here. In practice it is unlikely
1089 // and not worth worrying about.
1090 if (comp_level > mh->highest_comp_level()) {
1091 mh->set_highest_comp_level(comp_level);
1092 }
1093
1094 OrderAccess::storestore();
1095 #ifdef SHARK
1096 mh->_from_interpreted_entry = code->insts_begin();
1097 #else //!SHARK
1098 mh->_from_compiled_entry = code->verified_entry_point();
1099 OrderAccess::storestore();
1100 // Instantly compiled code can execute.
1101 if (!mh->is_method_handle_intrinsic())
1102 mh->_from_interpreted_entry = mh->get_i2c_entry();
1103 #endif //!SHARK
1104 }
1105
1106
1107 bool Method::is_overridden_in(Klass* k) const {
1108 InstanceKlass* ik = InstanceKlass::cast(k);
1109
1110 if (ik->is_interface()) return false;
1111
1112 // If method is an interface, we skip it - except if it
1113 // is a miranda method
1114 if (method_holder()->is_interface()) {
1115 // Check that method is not a miranda method
1116 if (ik->lookup_method(name(), signature()) == NULL) {
1117 // No implementation exist - so miranda method
1118 return false;
1119 }
1120 return true;
1121 }
1122
1123 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1124 assert(ik->vtable() != NULL, "vtable should exist");
1125 if (!has_vtable_index()) {
1126 return false;
1127 } else {
1128 Method* vt_m = ik->method_at_vtable(vtable_index());
1129 return vt_m != this;
1130 }
1131 }
1132
1133
1134 // give advice about whether this Method* should be cached or not
1135 bool Method::should_not_be_cached() const {
1136 if (is_old()) {
1137 // This method has been redefined. It is either EMCP or obsolete
1138 // and we don't want to cache it because that would pin the method
1139 // down and prevent it from being collectible if and when it
1140 // finishes executing.
1141 return true;
1142 }
1143
1144 // caching this method should be just fine
1145 return false;
1146 }
1147
1148
1149 /**
1150 * Returns true if this is one of the specially treated methods for
1151 * security related stack walks (like Reflection.getCallerClass).
1152 */
1153 bool Method::is_ignored_by_security_stack_walk() const {
1154 if (intrinsic_id() == vmIntrinsics::_invoke) {
1155 // This is Method.invoke() -- ignore it
1156 return true;
1157 }
1158 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1159 // This is an auxilary frame -- ignore it
1160 return true;
1161 }
1162 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1163 // This is an internal adapter frame for method handles -- ignore it
1164 return true;
1165 }
1166 return false;
1167 }
1168
1169
1170 // Constant pool structure for invoke methods:
1171 enum {
1172 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1173 _imcp_invoke_signature, // utf8: (variable Symbol*)
1174 _imcp_limit
1175 };
1176
1177 // Test if this method is an MH adapter frame generated by Java code.
1178 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1179 bool Method::is_compiled_lambda_form() const {
1180 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1181 }
1182
1183 // Test if this method is an internal MH primitive method.
1184 bool Method::is_method_handle_intrinsic() const {
1185 vmIntrinsics::ID iid = intrinsic_id();
1186 return (MethodHandles::is_signature_polymorphic(iid) &&
1187 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1188 }
1189
1190 bool Method::has_member_arg() const {
1191 vmIntrinsics::ID iid = intrinsic_id();
1192 return (MethodHandles::is_signature_polymorphic(iid) &&
1193 MethodHandles::has_member_arg(iid));
1194 }
1195
1196 // Make an instance of a signature-polymorphic internal MH primitive.
1197 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1198 Symbol* signature,
1199 TRAPS) {
1200 ResourceMark rm;
1201 methodHandle empty;
1202
1203 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1204 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1205 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1206 if (TraceMethodHandles) {
1207 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1208 }
1209
1210 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1211 name->increment_refcount();
1212 signature->increment_refcount();
1213
1214 int cp_length = _imcp_limit;
1215 ClassLoaderData* loader_data = holder->class_loader_data();
1216 constantPoolHandle cp;
1217 {
1218 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1219 cp = constantPoolHandle(THREAD, cp_oop);
1220 }
1221 cp->set_pool_holder(InstanceKlass::cast(holder()));
1222 cp->symbol_at_put(_imcp_invoke_name, name);
1223 cp->symbol_at_put(_imcp_invoke_signature, signature);
1224 cp->set_has_preresolution();
1225
1226 // decide on access bits: public or not?
1227 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1228 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1229 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1230 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1231
1232 methodHandle m;
1233 {
1234 InlineTableSizes sizes;
1235 Method* m_oop = Method::allocate(loader_data, 0,
1236 accessFlags_from(flags_bits), &sizes,
1237 ConstMethod::NORMAL, CHECK_(empty));
1238 m = methodHandle(THREAD, m_oop);
1239 }
1240 m->set_constants(cp());
1241 m->set_name_index(_imcp_invoke_name);
1242 m->set_signature_index(_imcp_invoke_signature);
1243 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1244 assert(m->signature() == signature, "");
1245 ResultTypeFinder rtf(signature);
1246 m->constMethod()->set_result_type(rtf.type());
1247 m->compute_size_of_parameters(THREAD);
1248 m->init_intrinsic_id();
1249 assert(m->is_method_handle_intrinsic(), "");
1250 #ifdef ASSERT
1251 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1252 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1253 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1254 #endif //ASSERT
1255
1256 // Finally, set up its entry points.
1257 assert(m->can_be_statically_bound(), "");
1258 m->set_vtable_index(Method::nonvirtual_vtable_index);
1259 m->link_method(m, CHECK_(empty));
1260
1261 if (TraceMethodHandles && (Verbose || WizardMode)) {
1262 ttyLocker ttyl;
1263 m->print_on(tty);
1264 }
1265
1266 return m;
1267 }
1268
1269 Klass* Method::check_non_bcp_klass(Klass* klass) {
1270 if (klass != NULL && klass->class_loader() != NULL) {
1271 if (klass->is_objArray_klass())
1272 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1273 return klass;
1274 }
1275 return NULL;
1276 }
1277
1278
1279 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1280 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1281 // Code below does not work for native methods - they should never get rewritten anyway
1282 assert(!m->is_native(), "cannot rewrite native methods");
1283 // Allocate new Method*
1284 AccessFlags flags = m->access_flags();
1285
1286 ConstMethod* cm = m->constMethod();
1287 int checked_exceptions_len = cm->checked_exceptions_length();
1288 int localvariable_len = cm->localvariable_table_length();
1289 int exception_table_len = cm->exception_table_length();
1290 int method_parameters_len = cm->method_parameters_length();
1291 int method_annotations_len = cm->method_annotations_length();
1292 int parameter_annotations_len = cm->parameter_annotations_length();
1293 int type_annotations_len = cm->type_annotations_length();
1294 int default_annotations_len = cm->default_annotations_length();
1295
1296 InlineTableSizes sizes(
1297 localvariable_len,
1298 new_compressed_linenumber_size,
1299 exception_table_len,
1300 checked_exceptions_len,
1301 method_parameters_len,
1302 cm->generic_signature_index(),
1303 method_annotations_len,
1304 parameter_annotations_len,
1305 type_annotations_len,
1306 default_annotations_len,
1307 0);
1308
1309 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1310 Method* newm_oop = Method::allocate(loader_data,
1311 new_code_length,
1312 flags,
1313 &sizes,
1314 m->method_type(),
1315 CHECK_(methodHandle()));
1316 methodHandle newm (THREAD, newm_oop);
1317
1318 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1319 ConstMethod* newcm = newm->constMethod();
1320 int new_const_method_size = newm->constMethod()->size();
1321
1322 memcpy(newm(), m(), sizeof(Method));
1323
1324 // Create shallow copy of ConstMethod.
1325 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1326
1327 // Reset correct method/const method, method size, and parameter info
1328 newm->set_constMethod(newcm);
1329 newm->constMethod()->set_code_size(new_code_length);
1330 newm->constMethod()->set_constMethod_size(new_const_method_size);
1331 assert(newm->code_size() == new_code_length, "check");
1332 assert(newm->method_parameters_length() == method_parameters_len, "check");
1333 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1334 assert(newm->exception_table_length() == exception_table_len, "check");
1335 assert(newm->localvariable_table_length() == localvariable_len, "check");
1336 // Copy new byte codes
1337 memcpy(newm->code_base(), new_code, new_code_length);
1338 // Copy line number table
1339 if (new_compressed_linenumber_size > 0) {
1340 memcpy(newm->compressed_linenumber_table(),
1341 new_compressed_linenumber_table,
1342 new_compressed_linenumber_size);
1343 }
1344 // Copy method_parameters
1345 if (method_parameters_len > 0) {
1346 memcpy(newm->method_parameters_start(),
1347 m->method_parameters_start(),
1348 method_parameters_len * sizeof(MethodParametersElement));
1349 }
1350 // Copy checked_exceptions
1351 if (checked_exceptions_len > 0) {
1352 memcpy(newm->checked_exceptions_start(),
1353 m->checked_exceptions_start(),
1354 checked_exceptions_len * sizeof(CheckedExceptionElement));
1355 }
1356 // Copy exception table
1357 if (exception_table_len > 0) {
1358 memcpy(newm->exception_table_start(),
1359 m->exception_table_start(),
1360 exception_table_len * sizeof(ExceptionTableElement));
1361 }
1362 // Copy local variable number table
1363 if (localvariable_len > 0) {
1364 memcpy(newm->localvariable_table_start(),
1365 m->localvariable_table_start(),
1366 localvariable_len * sizeof(LocalVariableTableElement));
1367 }
1368 // Copy stackmap table
1369 if (m->has_stackmap_table()) {
1370 int code_attribute_length = m->stackmap_data()->length();
1371 Array<u1>* stackmap_data =
1372 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1373 memcpy((void*)stackmap_data->adr_at(0),
1374 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1375 newm->set_stackmap_data(stackmap_data);
1376 }
1377
1378 // copy annotations over to new method
1379 newcm->copy_annotations_from(cm);
1380 return newm;
1381 }
1382
1383 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) {
1384 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1385 // because we are not loading from core libraries
1386 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1387 // which does not use the class default class loader so we check for its loader here
1388 const InstanceKlass* ik = InstanceKlass::cast(holder);
1389 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1390 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1391 }
1392
1393 // see if the klass name is well-known:
1394 Symbol* klass_name = ik->name();
1395 return vmSymbols::find_sid(klass_name);
1396 }
1397
1398 void Method::init_intrinsic_id() {
1399 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1400 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1401 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1402 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1403
1404 // the klass name is well-known:
1405 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1406 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1407
1408 // ditto for method and signature:
1409 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1410 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1411 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1412 && name_id == vmSymbols::NO_SID) {
1413 return;
1414 }
1415 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1416 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1417 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1418 && sig_id == vmSymbols::NO_SID) {
1419 return;
1420 }
1421 jshort flags = access_flags().as_short();
1422
1423 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1424 if (id != vmIntrinsics::_none) {
1425 set_intrinsic_id(id);
1426 if (id == vmIntrinsics::_Class_cast) {
1427 // Even if the intrinsic is rejected, we want to inline this simple method.
1428 set_force_inline(true);
1429 }
1430 return;
1431 }
1432
1433 // A few slightly irregular cases:
1434 switch (klass_id) {
1435 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1436 // Second chance: check in regular Math.
1437 switch (name_id) {
1438 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1439 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1440 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1441 // pretend it is the corresponding method in the non-strict class:
1442 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1443 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1444 break;
1445 }
1446 break;
1447
1448 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1449 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1450 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1451 if (!is_native()) break;
1452 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1453 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1454 id = vmIntrinsics::_none;
1455 break;
1456 }
1457
1458 if (id != vmIntrinsics::_none) {
1459 // Set up its iid. It is an alias method.
1460 set_intrinsic_id(id);
1461 return;
1462 }
1463 }
1464
1465 // These two methods are static since a GC may move the Method
1466 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1467 if (!THREAD->can_call_java()) {
1468 // There is nothing useful this routine can do from within the Compile thread.
1469 // Hopefully, the signature contains only well-known classes.
1470 // We could scan for this and return true/false, but the caller won't care.
1471 return false;
1472 }
1473 bool sig_is_loaded = true;
1474 Handle class_loader(THREAD, m->method_holder()->class_loader());
1475 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1476 ResourceMark rm(THREAD);
1477 Symbol* signature = m->signature();
1478 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1479 if (ss.is_object()) {
1480 Symbol* sym = ss.as_symbol(CHECK_(false));
1481 Symbol* name = sym;
1482 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1483 protection_domain, THREAD);
1484 // We are loading classes eagerly. If a ClassNotFoundException or
1485 // a LinkageError was generated, be sure to ignore it.
1486 if (HAS_PENDING_EXCEPTION) {
1487 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1488 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1489 CLEAR_PENDING_EXCEPTION;
1490 } else {
1491 return false;
1492 }
1493 }
1494 if( klass == NULL) { sig_is_loaded = false; }
1495 }
1496 }
1497 return sig_is_loaded;
1498 }
1499
1500 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1501 Handle class_loader(THREAD, m->method_holder()->class_loader());
1502 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1503 ResourceMark rm(THREAD);
1504 Symbol* signature = m->signature();
1505 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1506 if (ss.type() == T_OBJECT) {
1507 Symbol* name = ss.as_symbol_or_null();
1508 if (name == NULL) return true;
1509 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1510 if (klass == NULL) return true;
1511 }
1512 }
1513 return false;
1514 }
1515
1516 // Exposed so field engineers can debug VM
1517 void Method::print_short_name(outputStream* st) {
1518 ResourceMark rm;
1519 #ifdef PRODUCT
1520 st->print(" %s::", method_holder()->external_name());
1521 #else
1522 st->print(" %s::", method_holder()->internal_name());
1523 #endif
1524 name()->print_symbol_on(st);
1525 if (WizardMode) signature()->print_symbol_on(st);
1526 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1527 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1528 }
1529
1530 // Comparer for sorting an object array containing
1531 // Method*s.
1532 static int method_comparator(Method* a, Method* b) {
1533 return a->name()->fast_compare(b->name());
1534 }
1535
1536 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1537 // default_methods also uses this without the ordering for fast find_method
1538 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1539 int length = methods->length();
1540 if (length > 1) {
1541 {
1542 NoSafepointVerifier nsv;
1543 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1544 }
1545 // Reset method ordering
1546 if (set_idnums) {
1547 for (int i = 0; i < length; i++) {
1548 Method* m = methods->at(i);
1549 m->set_method_idnum(i);
1550 m->set_orig_method_idnum(i);
1551 }
1552 }
1553 }
1554 }
1555
1556 //-----------------------------------------------------------------------------------
1557 // Non-product code unless JVM/TI needs it
1558
1559 #if !defined(PRODUCT) || INCLUDE_JVMTI
1560 class SignatureTypePrinter : public SignatureTypeNames {
1561 private:
1562 outputStream* _st;
1563 bool _use_separator;
1564
1565 void type_name(const char* name) {
1566 if (_use_separator) _st->print(", ");
1567 _st->print("%s", name);
1568 _use_separator = true;
1569 }
1570
1571 public:
1572 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1573 _st = st;
1574 _use_separator = false;
1575 }
1576
1577 void print_parameters() { _use_separator = false; iterate_parameters(); }
1578 void print_returntype() { _use_separator = false; iterate_returntype(); }
1579 };
1580
1581
1582 void Method::print_name(outputStream* st) {
1583 Thread *thread = Thread::current();
1584 ResourceMark rm(thread);
1585 st->print("%s ", is_static() ? "static" : "virtual");
1586 if (WizardMode) {
1587 st->print("%s.", method_holder()->internal_name());
1588 name()->print_symbol_on(st);
1589 signature()->print_symbol_on(st);
1590 } else {
1591 SignatureTypePrinter sig(signature(), st);
1592 sig.print_returntype();
1593 st->print(" %s.", method_holder()->internal_name());
1594 name()->print_symbol_on(st);
1595 st->print("(");
1596 sig.print_parameters();
1597 st->print(")");
1598 }
1599 }
1600 #endif // !PRODUCT || INCLUDE_JVMTI
1601
1602
1603 void Method::print_codes_on(outputStream* st) const {
1604 print_codes_on(0, code_size(), st);
1605 }
1606
1607 void Method::print_codes_on(int from, int to, outputStream* st) const {
1608 Thread *thread = Thread::current();
1609 ResourceMark rm(thread);
1610 methodHandle mh (thread, (Method*)this);
1611 BytecodeStream s(mh);
1612 s.set_interval(from, to);
1613 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1614 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1615 }
1616
1617
1618 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1619 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1620 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1621 // as end-of-stream terminator.
1622
1623 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1624 // bci and line number does not compress into single byte.
1625 // Write out escape character and use regular compression for bci and line number.
1626 write_byte((jubyte)0xFF);
1627 write_signed_int(bci_delta);
1628 write_signed_int(line_delta);
1629 }
1630
1631 // See comment in method.hpp which explains why this exists.
1632 #if defined(_M_AMD64) && _MSC_VER >= 1400
1633 #pragma optimize("", off)
1634 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1635 write_pair_inline(bci, line);
1636 }
1637 #pragma optimize("", on)
1638 #endif
1639
1640 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1641 _bci = 0;
1642 _line = 0;
1643 };
1644
1645
1646 bool CompressedLineNumberReadStream::read_pair() {
1647 jubyte next = read_byte();
1648 // Check for terminator
1649 if (next == 0) return false;
1650 if (next == 0xFF) {
1651 // Escape character, regular compression used
1652 _bci += read_signed_int();
1653 _line += read_signed_int();
1654 } else {
1655 // Single byte compression used
1656 _bci += next >> 3;
1657 _line += next & 0x7;
1658 }
1659 return true;
1660 }
1661
1662 #if INCLUDE_JVMTI
1663
1664 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1665 BreakpointInfo* bp = method_holder()->breakpoints();
1666 for (; bp != NULL; bp = bp->next()) {
1667 if (bp->match(this, bci)) {
1668 return bp->orig_bytecode();
1669 }
1670 }
1671 {
1672 ResourceMark rm;
1673 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1674 }
1675 return Bytecodes::_shouldnotreachhere;
1676 }
1677
1678 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1679 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1680 BreakpointInfo* bp = method_holder()->breakpoints();
1681 for (; bp != NULL; bp = bp->next()) {
1682 if (bp->match(this, bci)) {
1683 bp->set_orig_bytecode(code);
1684 // and continue, in case there is more than one
1685 }
1686 }
1687 }
1688
1689 void Method::set_breakpoint(int bci) {
1690 InstanceKlass* ik = method_holder();
1691 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1692 bp->set_next(ik->breakpoints());
1693 ik->set_breakpoints(bp);
1694 // do this last:
1695 bp->set(this);
1696 }
1697
1698 static void clear_matches(Method* m, int bci) {
1699 InstanceKlass* ik = m->method_holder();
1700 BreakpointInfo* prev_bp = NULL;
1701 BreakpointInfo* next_bp;
1702 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1703 next_bp = bp->next();
1704 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1705 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1706 // do this first:
1707 bp->clear(m);
1708 // unhook it
1709 if (prev_bp != NULL)
1710 prev_bp->set_next(next_bp);
1711 else
1712 ik->set_breakpoints(next_bp);
1713 delete bp;
1714 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1715 // at same location. So we have multiple matching (method_index and bci)
1716 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1717 // breakpoint for clear_breakpoint request and keep all other method versions
1718 // BreakpointInfo for future clear_breakpoint request.
1719 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1720 // which is being called when class is unloaded. We delete all the Breakpoint
1721 // information for all versions of method. We may not correctly restore the original
1722 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1723 // so these methods won't be used anymore.
1724 if (bci >= 0) {
1725 break;
1726 }
1727 } else {
1728 // This one is a keeper.
1729 prev_bp = bp;
1730 }
1731 }
1732 }
1733
1734 void Method::clear_breakpoint(int bci) {
1735 assert(bci >= 0, "");
1736 clear_matches(this, bci);
1737 }
1738
1739 void Method::clear_all_breakpoints() {
1740 clear_matches(this, -1);
1741 }
1742
1743 #endif // INCLUDE_JVMTI
1744
1745 int Method::invocation_count() {
1746 MethodCounters *mcs = method_counters();
1747 if (TieredCompilation) {
1748 MethodData* const mdo = method_data();
1749 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1750 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1751 return InvocationCounter::count_limit;
1752 } else {
1753 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1754 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1755 }
1756 } else {
1757 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1758 }
1759 }
1760
1761 int Method::backedge_count() {
1762 MethodCounters *mcs = method_counters();
1763 if (TieredCompilation) {
1764 MethodData* const mdo = method_data();
1765 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1766 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1767 return InvocationCounter::count_limit;
1768 } else {
1769 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1770 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1771 }
1772 } else {
1773 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1774 }
1775 }
1776
1777 int Method::highest_comp_level() const {
1778 const MethodCounters* mcs = method_counters();
1779 if (mcs != NULL) {
1780 return mcs->highest_comp_level();
1781 } else {
1782 return CompLevel_none;
1783 }
1784 }
1785
1786 int Method::highest_osr_comp_level() const {
1787 const MethodCounters* mcs = method_counters();
1788 if (mcs != NULL) {
1789 return mcs->highest_osr_comp_level();
1790 } else {
1791 return CompLevel_none;
1792 }
1793 }
1794
1795 void Method::set_highest_comp_level(int level) {
1796 MethodCounters* mcs = method_counters();
1797 if (mcs != NULL) {
1798 mcs->set_highest_comp_level(level);
1799 }
1800 }
1801
1802 void Method::set_highest_osr_comp_level(int level) {
1803 MethodCounters* mcs = method_counters();
1804 if (mcs != NULL) {
1805 mcs->set_highest_osr_comp_level(level);
1806 }
1807 }
1808
1809 #if INCLUDE_JVMTI
1810
1811 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1812 _bci = bci;
1813 _name_index = m->name_index();
1814 _signature_index = m->signature_index();
1815 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1816 if (_orig_bytecode == Bytecodes::_breakpoint)
1817 _orig_bytecode = m->orig_bytecode_at(_bci);
1818 _next = NULL;
1819 }
1820
1821 void BreakpointInfo::set(Method* method) {
1822 #ifdef ASSERT
1823 {
1824 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1825 if (code == Bytecodes::_breakpoint)
1826 code = method->orig_bytecode_at(_bci);
1827 assert(orig_bytecode() == code, "original bytecode must be the same");
1828 }
1829 #endif
1830 Thread *thread = Thread::current();
1831 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1832 method->incr_number_of_breakpoints(thread);
1833 SystemDictionary::notice_modification();
1834 {
1835 // Deoptimize all dependents on this method
1836 HandleMark hm(thread);
1837 methodHandle mh(thread, method);
1838 CodeCache::flush_dependents_on_method(mh);
1839 }
1840 }
1841
1842 void BreakpointInfo::clear(Method* method) {
1843 *method->bcp_from(_bci) = orig_bytecode();
1844 assert(method->number_of_breakpoints() > 0, "must not go negative");
1845 method->decr_number_of_breakpoints(Thread::current());
1846 }
1847
1848 #endif // INCLUDE_JVMTI
1849
1850 // jmethodID handling
1851
1852 // This is a block allocating object, sort of like JNIHandleBlock, only a
1853 // lot simpler.
1854 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1855 // never get rid of it.
1856
1857 static const int min_block_size = 8;
1858
1859 class JNIMethodBlockNode : public CHeapObj<mtClass> {
1860 friend class JNIMethodBlock;
1861 Method** _methods;
1862 int _number_of_methods;
1863 int _top;
1864 JNIMethodBlockNode* _next;
1865
1866 public:
1867
1868 JNIMethodBlockNode(int num_methods = min_block_size);
1869
1870 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
1871
1872 void ensure_methods(int num_addl_methods) {
1873 if (_top < _number_of_methods) {
1874 num_addl_methods -= _number_of_methods - _top;
1875 if (num_addl_methods <= 0) {
1876 return;
1877 }
1878 }
1879 if (_next == NULL) {
1880 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
1881 } else {
1882 _next->ensure_methods(num_addl_methods);
1883 }
1884 }
1885 };
1886
1887 class JNIMethodBlock : public CHeapObj<mtClass> {
1888 JNIMethodBlockNode _head;
1889 JNIMethodBlockNode *_last_free;
1890 public:
1891 static Method* const _free_method;
1892
1893 JNIMethodBlock(int initial_capacity = min_block_size)
1894 : _head(initial_capacity), _last_free(&_head) {}
1895
1896 void ensure_methods(int num_addl_methods) {
1897 _last_free->ensure_methods(num_addl_methods);
1898 }
1899
1900 Method** add_method(Method* m) {
1901 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) {
1902 if (b->_top < b->_number_of_methods) {
1903 // top points to the next free entry.
1904 int i = b->_top;
1905 b->_methods[i] = m;
1906 b->_top++;
1907 _last_free = b;
1908 return &(b->_methods[i]);
1909 } else if (b->_top == b->_number_of_methods) {
1910 // if the next free entry ran off the block see if there's a free entry
1911 for (int i = 0; i < b->_number_of_methods; i++) {
1912 if (b->_methods[i] == _free_method) {
1913 b->_methods[i] = m;
1914 _last_free = b;
1915 return &(b->_methods[i]);
1916 }
1917 }
1918 // Only check each block once for frees. They're very unlikely.
1919 // Increment top past the end of the block.
1920 b->_top++;
1921 }
1922 // need to allocate a next block.
1923 if (b->_next == NULL) {
1924 b->_next = _last_free = new JNIMethodBlockNode();
1925 }
1926 }
1927 guarantee(false, "Should always allocate a free block");
1928 return NULL;
1929 }
1930
1931 bool contains(Method** m) {
1932 if (m == NULL) return false;
1933 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
1934 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
1935 // This is a bit of extra checking, for two reasons. One is
1936 // that contains() deals with pointers that are passed in by
1937 // JNI code, so making sure that the pointer is aligned
1938 // correctly is valuable. The other is that <= and > are
1939 // technically not defined on pointers, so the if guard can
1940 // pass spuriously; no modern compiler is likely to make that
1941 // a problem, though (and if one did, the guard could also
1942 // fail spuriously, which would be bad).
1943 ptrdiff_t idx = m - b->_methods;
1944 if (b->_methods + idx == m) {
1945 return true;
1946 }
1947 }
1948 }
1949 return false; // not found
1950 }
1951
1952 // Doesn't really destroy it, just marks it as free so it can be reused.
1953 void destroy_method(Method** m) {
1954 #ifdef ASSERT
1955 assert(contains(m), "should be a methodID");
1956 #endif // ASSERT
1957 *m = _free_method;
1958 }
1959
1960 // During class unloading the methods are cleared, which is different
1961 // than freed.
1962 void clear_all_methods() {
1963 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
1964 for (int i = 0; i< b->_number_of_methods; i++) {
1965 b->_methods[i] = NULL;
1966 }
1967 }
1968 }
1969 #ifndef PRODUCT
1970 int count_methods() {
1971 // count all allocated methods
1972 int count = 0;
1973 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
1974 for (int i = 0; i< b->_number_of_methods; i++) {
1975 if (b->_methods[i] != _free_method) count++;
1976 }
1977 }
1978 return count;
1979 }
1980 #endif // PRODUCT
1981 };
1982
1983 // Something that can't be mistaken for an address or a markOop
1984 Method* const JNIMethodBlock::_free_method = (Method*)55;
1985
1986 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) {
1987 _number_of_methods = MAX2(num_methods, min_block_size);
1988 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
1989 for (int i = 0; i < _number_of_methods; i++) {
1990 _methods[i] = JNIMethodBlock::_free_method;
1991 }
1992 }
1993
1994 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
1995 ClassLoaderData* cld = loader_data;
1996 if (!SafepointSynchronize::is_at_safepoint()) {
1997 // Have to add jmethod_ids() to class loader data thread-safely.
1998 // Also have to add the method to the list safely, which the cld lock
1999 // protects as well.
2000 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2001 if (cld->jmethod_ids() == NULL) {
2002 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2003 } else {
2004 cld->jmethod_ids()->ensure_methods(capacity);
2005 }
2006 } else {
2007 // At safepoint, we are single threaded and can set this.
2008 if (cld->jmethod_ids() == NULL) {
2009 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2010 } else {
2011 cld->jmethod_ids()->ensure_methods(capacity);
2012 }
2013 }
2014 }
2015
2016 // Add a method id to the jmethod_ids
2017 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
2018 ClassLoaderData* cld = loader_data;
2019
2020 if (!SafepointSynchronize::is_at_safepoint()) {
2021 // Have to add jmethod_ids() to class loader data thread-safely.
2022 // Also have to add the method to the list safely, which the cld lock
2023 // protects as well.
2024 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2025 if (cld->jmethod_ids() == NULL) {
2026 cld->set_jmethod_ids(new JNIMethodBlock());
2027 }
2028 // jmethodID is a pointer to Method*
2029 return (jmethodID)cld->jmethod_ids()->add_method(m);
2030 } else {
2031 // At safepoint, we are single threaded and can set this.
2032 if (cld->jmethod_ids() == NULL) {
2033 cld->set_jmethod_ids(new JNIMethodBlock());
2034 }
2035 // jmethodID is a pointer to Method*
2036 return (jmethodID)cld->jmethod_ids()->add_method(m);
2037 }
2038 }
2039
2040 // Mark a jmethodID as free. This is called when there is a data race in
2041 // InstanceKlass while creating the jmethodID cache.
2042 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
2043 ClassLoaderData* cld = loader_data;
2044 Method** ptr = (Method**)m;
2045 assert(cld->jmethod_ids() != NULL, "should have method handles");
2046 cld->jmethod_ids()->destroy_method(ptr);
2047 }
2048
2049 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2050 // Can't assert the method_holder is the same because the new method has the
2051 // scratch method holder.
2052 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2053 == new_method->method_holder()->class_loader(),
2054 "changing to a different class loader");
2055 // Just change the method in place, jmethodID pointer doesn't change.
2056 *((Method**)jmid) = new_method;
2057 }
2058
2059 bool Method::is_method_id(jmethodID mid) {
2060 Method* m = resolve_jmethod_id(mid);
2061 assert(m != NULL, "should be called with non-null method");
2062 InstanceKlass* ik = m->method_holder();
2063 ClassLoaderData* cld = ik->class_loader_data();
2064 if (cld->jmethod_ids() == NULL) return false;
2065 return (cld->jmethod_ids()->contains((Method**)mid));
2066 }
2067
2068 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2069 if (mid == NULL) return NULL;
2070 Method* o = resolve_jmethod_id(mid);
2071 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
2072 return NULL;
2073 }
2074 return o;
2075 };
2076
2077 void Method::set_on_stack(const bool value) {
2078 // Set both the method itself and its constant pool. The constant pool
2079 // on stack means some method referring to it is also on the stack.
2080 constants()->set_on_stack(value);
2081
2082 bool already_set = on_stack();
2083 _access_flags.set_on_stack(value);
2084 if (value && !already_set) {
2085 MetadataOnStackMark::record(this);
2086 }
2087 }
2088
2089 // Called when the class loader is unloaded to make all methods weak.
2090 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2091 loader_data->jmethod_ids()->clear_all_methods();
2092 }
2093
2094 bool Method::has_method_vptr(const void* ptr) {
2095 Method m;
2096 // This assumes that the vtbl pointer is the first word of a C++ object.
2097 // This assumption is also in universe.cpp patch_klass_vtble
2098 return dereference_vptr(&m) == dereference_vptr(ptr);
2099 }
2100
2101 // Check that this pointer is valid by checking that the vtbl pointer matches
2102 bool Method::is_valid_method() const {
2103 if (this == NULL) {
2104 return false;
2105 } else if ((intptr_t(this) & (wordSize-1)) != 0) {
2106 // Quick sanity check on pointer.
2107 return false;
2108 } else if (!is_metaspace_object()) {
2109 return false;
2110 } else {
2111 return has_method_vptr((const void*)this);
2112 }
2113 }
2114
2115 #ifndef PRODUCT
2116 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
2117 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
2118 }
2119 #endif // PRODUCT
2120
2121
2122 // Printing
2123
2124 #ifndef PRODUCT
2125
2126 void Method::print_on(outputStream* st) const {
2127 ResourceMark rm;
2128 assert(is_method(), "must be method");
2129 st->print_cr("%s", internal_name());
2130 // get the effect of PrintOopAddress, always, for methods:
2131 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this));
2132 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2133 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants()));
2134 constants()->print_value_on(st); st->cr();
2135 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2136 st->print (" - name: "); name()->print_value_on(st); st->cr();
2137 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2138 st->print_cr(" - max stack: %d", max_stack());
2139 st->print_cr(" - max locals: %d", max_locals());
2140 st->print_cr(" - size of params: %d", size_of_parameters());
2141 st->print_cr(" - method size: %d", method_size());
2142 if (intrinsic_id() != vmIntrinsics::_none)
2143 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
2144 if (highest_comp_level() != CompLevel_none)
2145 st->print_cr(" - highest level: %d", highest_comp_level());
2146 st->print_cr(" - vtable index: %d", _vtable_index);
2147 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry()));
2148 st->print( " - adapters: ");
2149 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2150 if (a == NULL)
2151 st->print_cr(INTPTR_FORMAT, p2i(a));
2152 else
2153 a->print_adapter_on(st);
2154 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry()));
2155 st->print_cr(" - code size: %d", code_size());
2156 if (code_size() != 0) {
2157 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base()));
2158 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size()));
2159 }
2160 if (method_data() != NULL) {
2161 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data()));
2162 }
2163 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2164 if (checked_exceptions_length() > 0) {
2165 CheckedExceptionElement* table = checked_exceptions_start();
2166 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table));
2167 if (Verbose) {
2168 for (int i = 0; i < checked_exceptions_length(); i++) {
2169 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2170 }
2171 }
2172 }
2173 if (has_linenumber_table()) {
2174 u_char* table = compressed_linenumber_table();
2175 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table));
2176 if (Verbose) {
2177 CompressedLineNumberReadStream stream(table);
2178 while (stream.read_pair()) {
2179 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2180 }
2181 }
2182 }
2183 st->print_cr(" - localvar length: %d", localvariable_table_length());
2184 if (localvariable_table_length() > 0) {
2185 LocalVariableTableElement* table = localvariable_table_start();
2186 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table));
2187 if (Verbose) {
2188 for (int i = 0; i < localvariable_table_length(); i++) {
2189 int bci = table[i].start_bci;
2190 int len = table[i].length;
2191 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2192 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2193 int slot = table[i].slot;
2194 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2195 }
2196 }
2197 }
2198 if (code() != NULL) {
2199 st->print (" - compiled code: ");
2200 code()->print_value_on(st);
2201 }
2202 if (is_native()) {
2203 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function()));
2204 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler()));
2205 }
2206 }
2207
2208 void Method::print_linkage_flags(outputStream* st) {
2209 access_flags().print_on(st);
2210 if (is_default_method()) {
2211 st->print("default ");
2212 }
2213 if (is_overpass()) {
2214 st->print("overpass ");
2215 }
2216 }
2217 #endif //PRODUCT
2218
2219 void Method::print_value_on(outputStream* st) const {
2220 assert(is_method(), "must be method");
2221 st->print("%s", internal_name());
2222 print_address_on(st);
2223 st->print(" ");
2224 name()->print_value_on(st);
2225 st->print(" ");
2226 signature()->print_value_on(st);
2227 st->print(" in ");
2228 method_holder()->print_value_on(st);
2229 if (WizardMode) st->print("#%d", _vtable_index);
2230 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2231 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2232 }
2233
2234 #if INCLUDE_SERVICES
2235 // Size Statistics
2236 void Method::collect_statistics(KlassSizeStats *sz) const {
2237 int mysize = sz->count(this);
2238 sz->_method_bytes += mysize;
2239 sz->_method_all_bytes += mysize;
2240 sz->_rw_bytes += mysize;
2241
2242 if (constMethod()) {
2243 constMethod()->collect_statistics(sz);
2244 }
2245 if (method_data()) {
2246 method_data()->collect_statistics(sz);
2247 }
2248 }
2249 #endif // INCLUDE_SERVICES
2250
2251 // LogTouchedMethods and PrintTouchedMethods
2252
2253 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because
2254 // the Method may be garbage collected. Let's roll our own hash table.
2255 class TouchedMethodRecord : CHeapObj<mtTracing> {
2256 public:
2257 // It's OK to store Symbols here because they will NOT be GC'ed if
2258 // LogTouchedMethods is enabled.
2259 TouchedMethodRecord* _next;
2260 Symbol* _class_name;
2261 Symbol* _method_name;
2262 Symbol* _method_signature;
2263 };
2264
2265 static const int TOUCHED_METHOD_TABLE_SIZE = 20011;
2266 static TouchedMethodRecord** _touched_method_table = NULL;
2267
2268 void Method::log_touched(TRAPS) {
2269
2270 const int table_size = TOUCHED_METHOD_TABLE_SIZE;
2271 Symbol* my_class = klass_name();
2272 Symbol* my_name = name();
2273 Symbol* my_sig = signature();
2274
2275 unsigned int hash = my_class->identity_hash() +
2276 my_name->identity_hash() +
2277 my_sig->identity_hash();
2278 juint index = juint(hash) % table_size;
2279
2280 MutexLocker ml(TouchedMethodLog_lock, THREAD);
2281 if (_touched_method_table == NULL) {
2282 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size,
2283 mtTracing, CURRENT_PC);
2284 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size);
2285 }
2286
2287 TouchedMethodRecord* ptr = _touched_method_table[index];
2288 while (ptr) {
2289 if (ptr->_class_name == my_class &&
2290 ptr->_method_name == my_name &&
2291 ptr->_method_signature == my_sig) {
2292 return;
2293 }
2294 if (ptr->_next == NULL) break;
2295 ptr = ptr->_next;
2296 }
2297 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing);
2298 my_class->set_permanent(); // prevent reclaimed by GC
2299 my_name->set_permanent();
2300 my_sig->set_permanent();
2301 nptr->_class_name = my_class;
2302 nptr->_method_name = my_name;
2303 nptr->_method_signature = my_sig;
2304 nptr->_next = NULL;
2305
2306 if (ptr == NULL) {
2307 // first
2308 _touched_method_table[index] = nptr;
2309 } else {
2310 ptr->_next = nptr;
2311 }
2312 }
2313
2314 void Method::print_touched_methods(outputStream* out) {
2315 MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock);
2316 out->print_cr("# Method::print_touched_methods version 1");
2317 if (_touched_method_table) {
2318 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) {
2319 TouchedMethodRecord* ptr = _touched_method_table[i];
2320 while(ptr) {
2321 ptr->_class_name->print_symbol_on(out); out->print(".");
2322 ptr->_method_name->print_symbol_on(out); out->print(":");
2323 ptr->_method_signature->print_symbol_on(out); out->cr();
2324 ptr = ptr->_next;
2325 }
2326 }
2327 }
2328 }
2329
2330 // Verification
2331
2332 void Method::verify_on(outputStream* st) {
2333 guarantee(is_method(), "object must be method");
2334 guarantee(constants()->is_constantPool(), "should be constant pool");
2335 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2336 MethodData* md = method_data();
2337 guarantee(md == NULL ||
2338 md->is_methodData(), "should be method data");
2339 }