1 /*
2 * Copyright (c) 1997, 2017, 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/metaspaceClosure.hpp"
41 #include "memory/metaspaceShared.hpp"
42 #include "memory/oopFactory.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "oops/constMethod.hpp"
45 #include "oops/method.hpp"
46 #include "oops/methodData.hpp"
47 #include "oops/objArrayOop.inline.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "oops/symbol.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "prims/methodHandles.hpp"
52 #include "prims/nativeLookup.hpp"
53 #include "runtime/arguments.hpp"
54 #include "runtime/compilationPolicy.hpp"
55 #include "runtime/frame.inline.hpp"
56 #include "runtime/handles.inline.hpp"
57 #include "runtime/init.hpp"
58 #include "runtime/orderAccess.inline.hpp"
59 #include "runtime/relocator.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/signature.hpp"
62 #include "utilities/align.hpp"
63 #include "utilities/quickSort.hpp"
64 #include "utilities/vmError.hpp"
65 #include "utilities/xmlstream.hpp"
66
67 // Implementation of Method
68
69 Method* Method::allocate(ClassLoaderData* loader_data,
70 int byte_code_size,
71 AccessFlags access_flags,
72 InlineTableSizes* sizes,
73 ConstMethod::MethodType method_type,
74 TRAPS) {
75 assert(!access_flags.is_native() || byte_code_size == 0,
76 "native methods should not contain byte codes");
77 ConstMethod* cm = ConstMethod::allocate(loader_data,
78 byte_code_size,
79 sizes,
80 method_type,
81 CHECK_NULL);
82 int size = Method::size(access_flags.is_native());
83 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags);
84 }
85
86 Method::Method(ConstMethod* xconst, AccessFlags access_flags) {
87 NoSafepointVerifier no_safepoint;
88 set_constMethod(xconst);
89 set_access_flags(access_flags);
90 set_intrinsic_id(vmIntrinsics::_none);
91 set_force_inline(false);
92 set_hidden(false);
93 set_dont_inline(false);
94 set_has_injected_profile(false);
95 set_method_data(NULL);
96 clear_method_counters();
97 set_vtable_index(Method::garbage_vtable_index);
98
99 // Fix and bury in Method*
100 set_interpreter_entry(NULL); // sets i2i entry and from_int
101 set_adapter_entry(NULL);
102 clear_code(false /* don't need a lock */); // from_c/from_i get set to c2i/i2i
103
104 if (access_flags.is_native()) {
105 clear_native_function();
106 set_signature_handler(NULL);
107 }
108
109 NOT_PRODUCT(set_compiled_invocation_count(0);)
110 }
111
112 // Release Method*. The nmethod will be gone when we get here because
113 // we've walked the code cache.
114 void Method::deallocate_contents(ClassLoaderData* loader_data) {
115 MetadataFactory::free_metadata(loader_data, constMethod());
116 set_constMethod(NULL);
117 MetadataFactory::free_metadata(loader_data, method_data());
118 set_method_data(NULL);
119 MetadataFactory::free_metadata(loader_data, method_counters());
120 clear_method_counters();
121 // The nmethod will be gone when we get here.
122 if (code() != NULL) _code = NULL;
123 }
124
125 address Method::get_i2c_entry() {
126 assert(adapter() != NULL, "must have");
127 return adapter()->get_i2c_entry();
128 }
129
130 address Method::get_c2i_entry() {
131 assert(adapter() != NULL, "must have");
132 return adapter()->get_c2i_entry();
133 }
134
135 address Method::get_c2i_unverified_entry() {
136 assert(adapter() != NULL, "must have");
137 return adapter()->get_c2i_unverified_entry();
138 }
139
140 char* Method::name_and_sig_as_C_string() const {
141 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
142 }
143
144 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
145 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
146 }
147
148 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
149 const char* klass_name = klass->external_name();
150 int klass_name_len = (int)strlen(klass_name);
151 int method_name_len = method_name->utf8_length();
152 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
153 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
154 strcpy(dest, klass_name);
155 dest[klass_name_len] = '.';
156 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
157 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
158 dest[len] = 0;
159 return dest;
160 }
161
162 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
163 Symbol* klass_name = klass->name();
164 klass_name->as_klass_external_name(buf, size);
165 int len = (int)strlen(buf);
166
167 if (len < size - 1) {
168 buf[len++] = '.';
169
170 method_name->as_C_string(&(buf[len]), size - len);
171 len = (int)strlen(buf);
172
173 signature->as_C_string(&(buf[len]), size - len);
174 }
175
176 return buf;
177 }
178
179 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
180 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
181 // access exception table
182 ExceptionTable table(mh());
183 int length = table.length();
184 // iterate through all entries sequentially
185 constantPoolHandle pool(THREAD, mh->constants());
186 for (int i = 0; i < length; i ++) {
187 //reacquire the table in case a GC happened
188 ExceptionTable table(mh());
189 int beg_bci = table.start_pc(i);
190 int end_bci = table.end_pc(i);
191 assert(beg_bci <= end_bci, "inconsistent exception table");
192 if (beg_bci <= throw_bci && throw_bci < end_bci) {
193 // exception handler bci range covers throw_bci => investigate further
194 int handler_bci = table.handler_pc(i);
195 int klass_index = table.catch_type_index(i);
196 if (klass_index == 0) {
197 return handler_bci;
198 } else if (ex_klass == NULL) {
199 return handler_bci;
200 } else {
201 // we know the exception class => get the constraint class
202 // this may require loading of the constraint class; if verification
203 // fails or some other exception occurs, return handler_bci
204 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
205 assert(k != NULL, "klass not loaded");
206 if (ex_klass->is_subtype_of(k)) {
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 #if defined(ASSERT) && !INCLUDE_JVMCI
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 if (is_native() && bcp == 0) {
243 return 0;
244 }
245 #ifdef ASSERT
246 {
247 ResourceMark rm;
248 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(),
249 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s",
250 p2i(bcp), name_and_sig_as_C_string());
251 }
252 #endif
253 return bcp - code_base();
254 }
255
256
257 int Method::validate_bci(int bci) const {
258 return (bci == 0 || bci < code_size()) ? bci : -1;
259 }
260
261 // Return bci if it appears to be a valid bcp
262 // Return -1 otherwise.
263 // Used by profiling code, when invalid data is a possibility.
264 // The caller is responsible for validating the Method* itself.
265 int Method::validate_bci_from_bcp(address bcp) const {
266 // keep bci as -1 if not a valid bci
267 int bci = -1;
268 if (bcp == 0 || bcp == code_base()) {
269 // code_size() may return 0 and we allow 0 here
270 // the method may be native
271 bci = 0;
272 } else if (contains(bcp)) {
273 bci = bcp - code_base();
274 }
275 // Assert that if we have dodged any asserts, bci is negative.
276 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
277 return bci;
278 }
279
280 address Method::bcp_from(int bci) const {
281 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
282 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
283 address bcp = code_base() + bci;
284 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
285 return bcp;
286 }
287
288 address Method::bcp_from(address bcp) const {
289 if (is_native() && bcp == NULL) {
290 return code_base();
291 } else {
292 return bcp;
293 }
294 }
295
296 int Method::size(bool is_native) {
297 // If native, then include pointers for native_function and signature_handler
298 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
299 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
300 return align_metadata_size(header_size() + extra_words);
301 }
302
303
304 Symbol* Method::klass_name() const {
305 return method_holder()->name();
306 }
307
308
309 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
310 log_trace(cds)("Iter(Method): %p", this);
311
312 it->push(&_constMethod);
313 it->push(&_method_data);
314 it->push(&_method_counters);
315 }
316
317 // Attempt to return method oop to original state. Clear any pointers
318 // (to objects outside the shared spaces). We won't be able to predict
319 // where they should point in a new JVM. Further initialize some
320 // entries now in order allow them to be write protected later.
321
322 void Method::remove_unshareable_info() {
323 unlink_method();
324 }
325
326 void Method::set_vtable_index(int index) {
327 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
328 // At runtime initialize_vtable is rerun as part of link_class_impl()
329 // for a shared class loaded by the non-boot loader to obtain the loader
330 // constraints based on the runtime classloaders' context.
331 return; // don't write into the shared class
332 } else {
333 _vtable_index = index;
334 }
335 }
336
337 void Method::set_itable_index(int index) {
338 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
339 // At runtime initialize_itable is rerun as part of link_class_impl()
340 // for a shared class loaded by the non-boot loader to obtain the loader
341 // constraints based on the runtime classloaders' context. The dumptime
342 // itable index should be the same as the runtime index.
343 assert(_vtable_index == itable_index_max - index,
344 "archived itable index is different from runtime index");
345 return; // don’t write into the shared class
346 } else {
347 _vtable_index = itable_index_max - index;
348 }
349 assert(valid_itable_index(), "");
350 }
351
352
353
354 bool Method::was_executed_more_than(int n) {
355 // Invocation counter is reset when the Method* is compiled.
356 // If the method has compiled code we therefore assume it has
357 // be excuted more than n times.
358 if (is_accessor() || is_empty_method() || (code() != NULL)) {
359 // interpreter doesn't bump invocation counter of trivial methods
360 // compiler does not bump invocation counter of compiled methods
361 return true;
362 }
363 else if ((method_counters() != NULL &&
364 method_counters()->invocation_counter()->carry()) ||
365 (method_data() != NULL &&
366 method_data()->invocation_counter()->carry())) {
367 // The carry bit is set when the counter overflows and causes
368 // a compilation to occur. We don't know how many times
369 // the counter has been reset, so we simply assume it has
370 // been executed more than n times.
371 return true;
372 } else {
373 return invocation_count() > n;
374 }
375 }
376
377 void Method::print_invocation_count() {
378 if (is_static()) tty->print("static ");
379 if (is_final()) tty->print("final ");
380 if (is_synchronized()) tty->print("synchronized ");
381 if (is_native()) tty->print("native ");
382 tty->print("%s::", method_holder()->external_name());
383 name()->print_symbol_on(tty);
384 signature()->print_symbol_on(tty);
385
386 if (WizardMode) {
387 // dump the size of the byte codes
388 tty->print(" {%d}", code_size());
389 }
390 tty->cr();
391
392 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
393 tty->print_cr (" invocation_counter: %8d ", invocation_count());
394 tty->print_cr (" backedge_counter: %8d ", backedge_count());
395 #ifndef PRODUCT
396 if (CountCompiledCalls) {
397 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
398 }
399 #endif
400 }
401
402 // Build a MethodData* object to hold information about this method
403 // collected in the interpreter.
404 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) {
405 // Do not profile the method if metaspace has hit an OOM previously
406 // allocating profiling data. Callers clear pending exception so don't
407 // add one here.
408 if (ClassLoaderDataGraph::has_metaspace_oom()) {
409 return;
410 }
411
412 // Grab a lock here to prevent multiple
413 // MethodData*s from being created.
414 MutexLocker ml(MethodData_lock, THREAD);
415 if (method->method_data() == NULL) {
416 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
417 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
418 if (HAS_PENDING_EXCEPTION) {
419 CompileBroker::log_metaspace_failure();
420 ClassLoaderDataGraph::set_metaspace_oom(true);
421 return; // return the exception (which is cleared)
422 }
423
424 method->set_method_data(method_data);
425 if (PrintMethodData && (Verbose || WizardMode)) {
426 ResourceMark rm(THREAD);
427 tty->print("build_interpreter_method_data for ");
428 method->print_name(tty);
429 tty->cr();
430 // At the end of the run, the MDO, full of data, will be dumped.
431 }
432 }
433 }
434
435 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
436 // Do not profile the method if metaspace has hit an OOM previously
437 if (ClassLoaderDataGraph::has_metaspace_oom()) {
438 return NULL;
439 }
440
441 methodHandle mh(m);
442 MethodCounters* counters = MethodCounters::allocate(mh, THREAD);
443 if (HAS_PENDING_EXCEPTION) {
444 CompileBroker::log_metaspace_failure();
445 ClassLoaderDataGraph::set_metaspace_oom(true);
446 return NULL; // return the exception (which is cleared)
447 }
448 if (!mh->init_method_counters(counters)) {
449 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
450 }
451
452 if (LogTouchedMethods) {
453 mh->log_touched(CHECK_NULL);
454 }
455
456 return mh->method_counters();
457 }
458
459 void Method::cleanup_inline_caches() {
460 // The current system doesn't use inline caches in the interpreter
461 // => nothing to do (keep this method around for future use)
462 }
463
464
465 int Method::extra_stack_words() {
466 // not an inline function, to avoid a header dependency on Interpreter
467 return extra_stack_entries() * Interpreter::stackElementSize;
468 }
469
470
471 void Method::compute_size_of_parameters(Thread *thread) {
472 ArgumentSizeComputer asc(signature());
473 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
474 }
475
476 BasicType Method::result_type() const {
477 ResultTypeFinder rtf(signature());
478 return rtf.type();
479 }
480
481
482 bool Method::is_empty_method() const {
483 return code_size() == 1
484 && *code_base() == Bytecodes::_return;
485 }
486
487
488 bool Method::is_vanilla_constructor() const {
489 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
490 // which only calls the superclass vanilla constructor and possibly does stores of
491 // zero constants to local fields:
492 //
493 // aload_0
494 // invokespecial
495 // indexbyte1
496 // indexbyte2
497 //
498 // followed by an (optional) sequence of:
499 //
500 // aload_0
501 // aconst_null / iconst_0 / fconst_0 / dconst_0
502 // putfield
503 // indexbyte1
504 // indexbyte2
505 //
506 // followed by:
507 //
508 // return
509
510 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
511 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
512 int size = code_size();
513 // Check if size match
514 if (size == 0 || size % 5 != 0) return false;
515 address cb = code_base();
516 int last = size - 1;
517 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
518 // Does not call superclass default constructor
519 return false;
520 }
521 // Check optional sequence
522 for (int i = 4; i < last; i += 5) {
523 if (cb[i] != Bytecodes::_aload_0) return false;
524 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
525 if (cb[i+2] != Bytecodes::_putfield) return false;
526 }
527 return true;
528 }
529
530
531 bool Method::compute_has_loops_flag() {
532 BytecodeStream bcs(this);
533 Bytecodes::Code bc;
534
535 while ((bc = bcs.next()) >= 0) {
536 switch( bc ) {
537 case Bytecodes::_ifeq:
538 case Bytecodes::_ifnull:
539 case Bytecodes::_iflt:
540 case Bytecodes::_ifle:
541 case Bytecodes::_ifne:
542 case Bytecodes::_ifnonnull:
543 case Bytecodes::_ifgt:
544 case Bytecodes::_ifge:
545 case Bytecodes::_if_icmpeq:
546 case Bytecodes::_if_icmpne:
547 case Bytecodes::_if_icmplt:
548 case Bytecodes::_if_icmpgt:
549 case Bytecodes::_if_icmple:
550 case Bytecodes::_if_icmpge:
551 case Bytecodes::_if_acmpeq:
552 case Bytecodes::_if_acmpne:
553 case Bytecodes::_goto:
554 case Bytecodes::_jsr:
555 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
556 break;
557
558 case Bytecodes::_goto_w:
559 case Bytecodes::_jsr_w:
560 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
561 break;
562
563 default:
564 break;
565 }
566 }
567 _access_flags.set_loops_flag_init();
568 return _access_flags.has_loops();
569 }
570
571 bool Method::is_final_method(AccessFlags class_access_flags) const {
572 // or "does_not_require_vtable_entry"
573 // default method or overpass can occur, is not final (reuses vtable entry)
574 // private methods in classes get vtable entries for backward class compatibility.
575 if (is_overpass() || is_default_method()) return false;
576 return is_final() || class_access_flags.is_final();
577 }
578
579 bool Method::is_final_method() const {
580 return is_final_method(method_holder()->access_flags());
581 }
582
583 bool Method::is_default_method() const {
584 if (method_holder() != NULL &&
585 method_holder()->is_interface() &&
586 !is_abstract() && !is_private()) {
587 return true;
588 } else {
589 return false;
590 }
591 }
592
593 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
594 if (is_final_method(class_access_flags)) return true;
595 #ifdef ASSERT
596 ResourceMark rm;
597 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
598 if (class_access_flags.is_interface()) {
599 assert(is_nonv == is_static() || is_nonv == is_private(),
600 "nonvirtual unexpected for non-static, non-private: %s",
601 name_and_sig_as_C_string());
602 }
603 #endif
604 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
605 return vtable_index() == nonvirtual_vtable_index;
606 }
607
608 bool Method::can_be_statically_bound() const {
609 return can_be_statically_bound(method_holder()->access_flags());
610 }
611
612 bool Method::is_accessor() const {
613 return is_getter() || is_setter();
614 }
615
616 bool Method::is_getter() const {
617 if (code_size() != 5) return false;
618 if (size_of_parameters() != 1) return false;
619 if (java_code_at(0) != Bytecodes::_aload_0) return false;
620 if (java_code_at(1) != Bytecodes::_getfield) return false;
621 switch (java_code_at(4)) {
622 case Bytecodes::_ireturn:
623 case Bytecodes::_lreturn:
624 case Bytecodes::_freturn:
625 case Bytecodes::_dreturn:
626 case Bytecodes::_areturn:
627 break;
628 default:
629 return false;
630 }
631 return true;
632 }
633
634 bool Method::is_setter() const {
635 if (code_size() != 6) return false;
636 if (java_code_at(0) != Bytecodes::_aload_0) return false;
637 switch (java_code_at(1)) {
638 case Bytecodes::_iload_1:
639 case Bytecodes::_aload_1:
640 case Bytecodes::_fload_1:
641 if (size_of_parameters() != 2) return false;
642 break;
643 case Bytecodes::_dload_1:
644 case Bytecodes::_lload_1:
645 if (size_of_parameters() != 3) return false;
646 break;
647 default:
648 return false;
649 }
650 if (java_code_at(2) != Bytecodes::_putfield) return false;
651 if (java_code_at(5) != Bytecodes::_return) return false;
652 return true;
653 }
654
655 bool Method::is_constant_getter() const {
656 int last_index = code_size() - 1;
657 // Check if the first 1-3 bytecodes are a constant push
658 // and the last bytecode is a return.
659 return (2 <= code_size() && code_size() <= 4 &&
660 Bytecodes::is_const(java_code_at(0)) &&
661 Bytecodes::length_for(java_code_at(0)) == last_index &&
662 Bytecodes::is_return(java_code_at(last_index)));
663 }
664
665 bool Method::is_initializer() const {
666 return is_object_initializer() || is_static_initializer();
667 }
668
669 bool Method::has_valid_initializer_flags() const {
670 return (is_static() ||
671 method_holder()->major_version() < 51);
672 }
673
674 bool Method::is_static_initializer() const {
675 // For classfiles version 51 or greater, ensure that the clinit method is
676 // static. Non-static methods with the name "<clinit>" are not static
677 // initializers. (older classfiles exempted for backward compatibility)
678 return name() == vmSymbols::class_initializer_name() &&
679 has_valid_initializer_flags();
680 }
681
682 bool Method::is_object_initializer() const {
683 return name() == vmSymbols::object_initializer_name();
684 }
685
686 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
687 int length = method->checked_exceptions_length();
688 if (length == 0) { // common case
689 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
690 } else {
691 methodHandle h_this(THREAD, method);
692 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
693 objArrayHandle mirrors (THREAD, m_oop);
694 for (int i = 0; i < length; i++) {
695 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
696 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
697 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
698 mirrors->obj_at_put(i, k->java_mirror());
699 }
700 return mirrors;
701 }
702 };
703
704
705 int Method::line_number_from_bci(int bci) const {
706 if (bci == SynchronizationEntryBCI) bci = 0;
707 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
708 int best_bci = 0;
709 int best_line = -1;
710
711 if (has_linenumber_table()) {
712 // The line numbers are a short array of 2-tuples [start_pc, line_number].
713 // Not necessarily sorted and not necessarily one-to-one.
714 CompressedLineNumberReadStream stream(compressed_linenumber_table());
715 while (stream.read_pair()) {
716 if (stream.bci() == bci) {
717 // perfect match
718 return stream.line();
719 } else {
720 // update best_bci/line
721 if (stream.bci() < bci && stream.bci() >= best_bci) {
722 best_bci = stream.bci();
723 best_line = stream.line();
724 }
725 }
726 }
727 }
728 return best_line;
729 }
730
731
732 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
733 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
734 Thread *thread = Thread::current();
735 Symbol* klass_name = constants()->klass_name_at(klass_index);
736 Handle loader(thread, method_holder()->class_loader());
737 Handle prot (thread, method_holder()->protection_domain());
738 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
739 } else {
740 return true;
741 }
742 }
743
744
745 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
746 int klass_index = constants()->klass_ref_index_at(refinfo_index);
747 if (must_be_resolved) {
748 // Make sure klass is resolved in constantpool.
749 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
750 }
751 return is_klass_loaded_by_klass_index(klass_index);
752 }
753
754
755 void Method::set_native_function(address function, bool post_event_flag) {
756 assert(function != NULL, "use clear_native_function to unregister natives");
757 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
758 address* native_function = native_function_addr();
759
760 // We can see racers trying to place the same native function into place. Once
761 // is plenty.
762 address current = *native_function;
763 if (current == function) return;
764 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
765 function != NULL) {
766 // native_method_throw_unsatisfied_link_error_entry() should only
767 // be passed when post_event_flag is false.
768 assert(function !=
769 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
770 "post_event_flag mis-match");
771
772 // post the bind event, and possible change the bind function
773 JvmtiExport::post_native_method_bind(this, &function);
774 }
775 *native_function = function;
776 // This function can be called more than once. We must make sure that we always
777 // use the latest registered method -> check if a stub already has been generated.
778 // If so, we have to make it not_entrant.
779 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
780 if (nm != NULL) {
781 nm->make_not_entrant();
782 }
783 }
784
785
786 bool Method::has_native_function() const {
787 if (is_method_handle_intrinsic())
788 return false; // special-cased in SharedRuntime::generate_native_wrapper
789 address func = native_function();
790 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
791 }
792
793
794 void Method::clear_native_function() {
795 // Note: is_method_handle_intrinsic() is allowed here.
796 set_native_function(
797 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
798 !native_bind_event_is_interesting);
799 clear_code();
800 }
801
802 address Method::critical_native_function() {
803 methodHandle mh(this);
804 return NativeLookup::lookup_critical_entry(mh);
805 }
806
807
808 void Method::set_signature_handler(address handler) {
809 address* signature_handler = signature_handler_addr();
810 *signature_handler = handler;
811 }
812
813
814 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
815 if (PrintCompilation && report) {
816 ttyLocker ttyl;
817 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
818 if (comp_level == CompLevel_all) {
819 tty->print("all levels ");
820 } else {
821 tty->print("levels ");
822 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
823 tty->print("%d ", i);
824 }
825 }
826 this->print_short_name(tty);
827 int size = this->code_size();
828 if (size > 0) {
829 tty->print(" (%d bytes)", size);
830 }
831 if (reason != NULL) {
832 tty->print(" %s", reason);
833 }
834 tty->cr();
835 }
836 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
837 ttyLocker ttyl;
838 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
839 os::current_thread_id(), is_osr, comp_level);
840 if (reason != NULL) {
841 xtty->print(" reason=\'%s\'", reason);
842 }
843 xtty->method(this);
844 xtty->stamp();
845 xtty->end_elem();
846 }
847 }
848
849 bool Method::is_always_compilable() const {
850 // Generated adapters must be compiled
851 if (is_method_handle_intrinsic() && is_synthetic()) {
852 assert(!is_not_c1_compilable(), "sanity check");
853 assert(!is_not_c2_compilable(), "sanity check");
854 return true;
855 }
856
857 return false;
858 }
859
860 bool Method::is_not_compilable(int comp_level) const {
861 if (number_of_breakpoints() > 0)
862 return true;
863 if (is_always_compilable())
864 return false;
865 if (comp_level == CompLevel_any)
866 return is_not_c1_compilable() || is_not_c2_compilable();
867 if (is_c1_compile(comp_level))
868 return is_not_c1_compilable();
869 if (is_c2_compile(comp_level))
870 return is_not_c2_compilable();
871 return false;
872 }
873
874 // call this when compiler finds that this method is not compilable
875 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
876 if (is_always_compilable()) {
877 // Don't mark a method which should be always compilable
878 return;
879 }
880 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
881 if (comp_level == CompLevel_all) {
882 set_not_c1_compilable();
883 set_not_c2_compilable();
884 } else {
885 if (is_c1_compile(comp_level))
886 set_not_c1_compilable();
887 if (is_c2_compile(comp_level))
888 set_not_c2_compilable();
889 }
890 CompilationPolicy::policy()->disable_compilation(this);
891 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
892 }
893
894 bool Method::is_not_osr_compilable(int comp_level) const {
895 if (is_not_compilable(comp_level))
896 return true;
897 if (comp_level == CompLevel_any)
898 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
899 if (is_c1_compile(comp_level))
900 return is_not_c1_osr_compilable();
901 if (is_c2_compile(comp_level))
902 return is_not_c2_osr_compilable();
903 return false;
904 }
905
906 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
907 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
908 if (comp_level == CompLevel_all) {
909 set_not_c1_osr_compilable();
910 set_not_c2_osr_compilable();
911 } else {
912 if (is_c1_compile(comp_level))
913 set_not_c1_osr_compilable();
914 if (is_c2_compile(comp_level))
915 set_not_c2_osr_compilable();
916 }
917 CompilationPolicy::policy()->disable_compilation(this);
918 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
919 }
920
921 // Revert to using the interpreter and clear out the nmethod
922 void Method::clear_code(bool acquire_lock /* = true */) {
923 MutexLockerEx pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag);
924 // this may be NULL if c2i adapters have not been made yet
925 // Only should happen at allocate time.
926 if (adapter() == NULL) {
927 _from_compiled_entry = NULL;
928 } else {
929 _from_compiled_entry = adapter()->get_c2i_entry();
930 }
931 OrderAccess::storestore();
932 _from_interpreted_entry = _i2i_entry;
933 OrderAccess::storestore();
934 _code = NULL;
935 }
936
937 #if INCLUDE_CDS
938 // Called by class data sharing to remove any entry points (which are not shared)
939 void Method::unlink_method() {
940 _code = NULL;
941
942 assert(DumpSharedSpaces, "dump time only");
943 // Set the values to what they should be at run time. Note that
944 // this Method can no longer be executed during dump time.
945 _i2i_entry = Interpreter::entry_for_cds_method(this);
946 _from_interpreted_entry = _i2i_entry;
947
948 if (is_native()) {
949 *native_function_addr() = NULL;
950 set_signature_handler(NULL);
951 }
952 NOT_PRODUCT(set_compiled_invocation_count(0);)
953
954 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter();
955 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline());
956 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline();
957 assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time");
958
959
960 // In case of DumpSharedSpaces, _method_data should always be NULL.
961 assert(_method_data == NULL, "unexpected method data?");
962
963 set_method_data(NULL);
964 clear_method_counters();
965 }
966 #endif
967
968 /****************************************************************************
969 // The following illustrates how the entries work for CDS shared Methods:
970 //
971 // Our goal is to delay writing into a shared Method until it's compiled.
972 // Hence, we want to determine the initial values for _i2i_entry,
973 // _from_interpreted_entry and _from_compiled_entry during CDS dump time.
974 //
975 // In this example, both Methods A and B have the _i2i_entry of "zero_locals".
976 // They also have similar signatures so that they will share the same
977 // AdapterHandlerEntry.
978 //
979 // _adapter_trampoline points to a fixed location in the RW section of
980 // the CDS archive. This location initially contains a NULL pointer. When the
981 // first of method A or B is linked, an AdapterHandlerEntry is allocated
982 // dynamically, and its c2i/i2c entries are generated.
983 //
984 // _i2i_entry and _from_interpreted_entry initially points to the same
985 // (fixed) location in the CODE section of the CDS archive. This contains
986 // an unconditional branch to the actual entry for "zero_locals", which is
987 // generated at run time and may be on an arbitrary address. Thus, the
988 // unconditional branch is also generated at run time to jump to the correct
989 // address.
990 //
991 // Similarly, _from_compiled_entry points to a fixed address in the CODE
992 // section. This address has enough space for an unconditional branch
993 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is
994 // initialized, and the address for the actual c2i_entry is known, we emit a
995 // branch instruction here to branch to the actual c2i_entry.
996 //
997 // The effect of the extra branch on the i2i and c2i entries is negligible.
998 //
999 // The reason for putting _adapter_trampoline in RO is many shared Methods
1000 // share the same AdapterHandlerEntry, so we can save space in the RW section
1001 // by having the extra indirection.
1002
1003
1004 [Method A: RW]
1005 _constMethod ----> [ConstMethod: RO]
1006 _adapter_trampoline -----------+
1007 |
1008 _i2i_entry (same value as method B) |
1009 _from_interpreted_entry (same value as method B) |
1010 _from_compiled_entry (same value as method B) |
1011 |
1012 |
1013 [Method B: RW] +--------+
1014 _constMethod ----> [ConstMethod: RO] |
1015 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+
1016 |
1017 +-------------------------------+
1018 |
1019 +----> [AdapterHandlerEntry] (allocated at run time)
1020 _fingerprint
1021 _c2i_entry ---------------------------------+->[c2i entry..]
1022 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] |
1023 _from_interpreted_entry | _c2i_unverified_entry | |
1024 | | | |
1025 | | (_cds_entry_table: CODE) | |
1026 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | |
1027 | | (allocated at run time) | |
1028 | | ... [asm code ...] | |
1029 +-[not compiled]-+ [n]: jmp _entry_table[n] | |
1030 | | |
1031 | | |
1032 +-[compiled]-------------------------------------------------------------------+ |
1033 |
1034 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) |
1035 [jmp c2i_entry] ------------------------------------------------------+
1036
1037 ***/
1038
1039 // Called when the method_holder is getting linked. Setup entrypoints so the method
1040 // is ready to be called from interpreter, compiler, and vtables.
1041 void Method::link_method(const methodHandle& h_method, TRAPS) {
1042 // If the code cache is full, we may reenter this function for the
1043 // leftover methods that weren't linked.
1044 if (is_shared()) {
1045 address entry = Interpreter::entry_for_cds_method(h_method);
1046 assert(entry != NULL && entry == _i2i_entry,
1047 "should be correctly set during dump time");
1048 if (adapter() != NULL) {
1049 return;
1050 }
1051 assert(entry == _from_interpreted_entry,
1052 "should be correctly set during dump time");
1053 } else if (_i2i_entry != NULL) {
1054 return;
1055 }
1056 assert( _code == NULL, "nothing compiled yet" );
1057
1058 // Setup interpreter entrypoint
1059 assert(this == h_method(), "wrong h_method()" );
1060
1061 if (!is_shared()) {
1062 assert(adapter() == NULL, "init'd to NULL");
1063 address entry = Interpreter::entry_for_method(h_method);
1064 assert(entry != NULL, "interpreter entry must be non-null");
1065 // Sets both _i2i_entry and _from_interpreted_entry
1066 set_interpreter_entry(entry);
1067 }
1068
1069 // Don't overwrite already registered native entries.
1070 if (is_native() && !has_native_function()) {
1071 set_native_function(
1072 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1073 !native_bind_event_is_interesting);
1074 }
1075
1076 // Setup compiler entrypoint. This is made eagerly, so we do not need
1077 // special handling of vtables. An alternative is to make adapters more
1078 // lazily by calling make_adapter() from from_compiled_entry() for the
1079 // normal calls. For vtable calls life gets more complicated. When a
1080 // call-site goes mega-morphic we need adapters in all methods which can be
1081 // called from the vtable. We need adapters on such methods that get loaded
1082 // later. Ditto for mega-morphic itable calls. If this proves to be a
1083 // problem we'll make these lazily later.
1084 (void) make_adapters(h_method, CHECK);
1085
1086 // ONLY USE the h_method now as make_adapter may have blocked
1087
1088 }
1089
1090 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1091 // Adapters for compiled code are made eagerly here. They are fairly
1092 // small (generally < 100 bytes) and quick to make (and cached and shared)
1093 // so making them eagerly shouldn't be too expensive.
1094 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1095 if (adapter == NULL ) {
1096 if (!is_init_completed()) {
1097 // Don't throw exceptions during VM initialization because java.lang.* classes
1098 // might not have been initialized, causing problems when constructing the
1099 // Java exception object.
1100 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1101 } else {
1102 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1103 }
1104 }
1105
1106 if (mh->is_shared()) {
1107 assert(mh->adapter() == adapter, "must be");
1108 assert(mh->_from_compiled_entry != NULL, "must be");
1109 } else {
1110 mh->set_adapter_entry(adapter);
1111 mh->_from_compiled_entry = adapter->get_c2i_entry();
1112 }
1113 return adapter->get_c2i_entry();
1114 }
1115
1116 void Method::restore_unshareable_info(TRAPS) {
1117 assert(is_method() && is_valid_method(), "ensure C++ vtable is restored");
1118
1119 // Since restore_unshareable_info can be called more than once for a method, don't
1120 // redo any work.
1121 if (adapter() == NULL) {
1122 methodHandle mh(THREAD, this);
1123 link_method(mh, CHECK);
1124 }
1125 }
1126
1127 volatile address Method::from_compiled_entry_no_trampoline() const {
1128 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
1129 if (code) {
1130 return code->verified_entry_point();
1131 } else {
1132 return adapter()->get_c2i_entry();
1133 }
1134 }
1135
1136 // The verified_code_entry() must be called when a invoke is resolved
1137 // on this method.
1138
1139 // It returns the compiled code entry point, after asserting not null.
1140 // This function is called after potential safepoints so that nmethod
1141 // or adapter that it points to is still live and valid.
1142 // This function must not hit a safepoint!
1143 address Method::verified_code_entry() {
1144 debug_only(NoSafepointVerifier nsv;)
1145 assert(_from_compiled_entry != NULL, "must be set");
1146 return _from_compiled_entry;
1147 }
1148
1149 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1150 // (could be racing a deopt).
1151 // Not inline to avoid circular ref.
1152 bool Method::check_code() const {
1153 // cached in a register or local. There's a race on the value of the field.
1154 CompiledMethod *code = (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code);
1155 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1156 }
1157
1158 // Install compiled code. Instantly it can execute.
1159 void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
1160 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1161 assert( code, "use clear_code to remove code" );
1162 assert( mh->check_code(), "" );
1163
1164 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1165
1166 // These writes must happen in this order, because the interpreter will
1167 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1168 // which jumps to _from_compiled_entry.
1169 mh->_code = code; // Assign before allowing compiled code to exec
1170
1171 int comp_level = code->comp_level();
1172 // In theory there could be a race here. In practice it is unlikely
1173 // and not worth worrying about.
1174 if (comp_level > mh->highest_comp_level()) {
1175 mh->set_highest_comp_level(comp_level);
1176 }
1177
1178 OrderAccess::storestore();
1179 #ifdef SHARK
1180 mh->_from_interpreted_entry = code->insts_begin();
1181 #else //!SHARK
1182 mh->_from_compiled_entry = code->verified_entry_point();
1183 OrderAccess::storestore();
1184 // Instantly compiled code can execute.
1185 if (!mh->is_method_handle_intrinsic())
1186 mh->_from_interpreted_entry = mh->get_i2c_entry();
1187 #endif //!SHARK
1188 }
1189
1190
1191 bool Method::is_overridden_in(Klass* k) const {
1192 InstanceKlass* ik = InstanceKlass::cast(k);
1193
1194 if (ik->is_interface()) return false;
1195
1196 // If method is an interface, we skip it - except if it
1197 // is a miranda method
1198 if (method_holder()->is_interface()) {
1199 // Check that method is not a miranda method
1200 if (ik->lookup_method(name(), signature()) == NULL) {
1201 // No implementation exist - so miranda method
1202 return false;
1203 }
1204 return true;
1205 }
1206
1207 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1208 if (!has_vtable_index()) {
1209 return false;
1210 } else {
1211 Method* vt_m = ik->method_at_vtable(vtable_index());
1212 return vt_m != this;
1213 }
1214 }
1215
1216
1217 // give advice about whether this Method* should be cached or not
1218 bool Method::should_not_be_cached() const {
1219 if (is_old()) {
1220 // This method has been redefined. It is either EMCP or obsolete
1221 // and we don't want to cache it because that would pin the method
1222 // down and prevent it from being collectible if and when it
1223 // finishes executing.
1224 return true;
1225 }
1226
1227 // caching this method should be just fine
1228 return false;
1229 }
1230
1231
1232 /**
1233 * Returns true if this is one of the specially treated methods for
1234 * security related stack walks (like Reflection.getCallerClass).
1235 */
1236 bool Method::is_ignored_by_security_stack_walk() const {
1237 if (intrinsic_id() == vmIntrinsics::_invoke) {
1238 // This is Method.invoke() -- ignore it
1239 return true;
1240 }
1241 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1242 // This is an auxilary frame -- ignore it
1243 return true;
1244 }
1245 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1246 // This is an internal adapter frame for method handles -- ignore it
1247 return true;
1248 }
1249 return false;
1250 }
1251
1252
1253 // Constant pool structure for invoke methods:
1254 enum {
1255 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1256 _imcp_invoke_signature, // utf8: (variable Symbol*)
1257 _imcp_limit
1258 };
1259
1260 // Test if this method is an MH adapter frame generated by Java code.
1261 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1262 bool Method::is_compiled_lambda_form() const {
1263 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1264 }
1265
1266 // Test if this method is an internal MH primitive method.
1267 bool Method::is_method_handle_intrinsic() const {
1268 vmIntrinsics::ID iid = intrinsic_id();
1269 return (MethodHandles::is_signature_polymorphic(iid) &&
1270 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1271 }
1272
1273 bool Method::has_member_arg() const {
1274 vmIntrinsics::ID iid = intrinsic_id();
1275 return (MethodHandles::is_signature_polymorphic(iid) &&
1276 MethodHandles::has_member_arg(iid));
1277 }
1278
1279 // Make an instance of a signature-polymorphic internal MH primitive.
1280 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1281 Symbol* signature,
1282 TRAPS) {
1283 ResourceMark rm;
1284 methodHandle empty;
1285
1286 InstanceKlass* holder = SystemDictionary::MethodHandle_klass();
1287 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1288 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1289 if (TraceMethodHandles) {
1290 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1291 }
1292
1293 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1294 name->increment_refcount();
1295 signature->increment_refcount();
1296
1297 int cp_length = _imcp_limit;
1298 ClassLoaderData* loader_data = holder->class_loader_data();
1299 constantPoolHandle cp;
1300 {
1301 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1302 cp = constantPoolHandle(THREAD, cp_oop);
1303 }
1304 cp->set_pool_holder(holder);
1305 cp->symbol_at_put(_imcp_invoke_name, name);
1306 cp->symbol_at_put(_imcp_invoke_signature, signature);
1307 cp->set_has_preresolution();
1308
1309 // decide on access bits: public or not?
1310 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1311 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1312 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1313 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1314
1315 methodHandle m;
1316 {
1317 InlineTableSizes sizes;
1318 Method* m_oop = Method::allocate(loader_data, 0,
1319 accessFlags_from(flags_bits), &sizes,
1320 ConstMethod::NORMAL, CHECK_(empty));
1321 m = methodHandle(THREAD, m_oop);
1322 }
1323 m->set_constants(cp());
1324 m->set_name_index(_imcp_invoke_name);
1325 m->set_signature_index(_imcp_invoke_signature);
1326 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1327 assert(m->signature() == signature, "");
1328 ResultTypeFinder rtf(signature);
1329 m->constMethod()->set_result_type(rtf.type());
1330 m->compute_size_of_parameters(THREAD);
1331 m->init_intrinsic_id();
1332 assert(m->is_method_handle_intrinsic(), "");
1333 #ifdef ASSERT
1334 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1335 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1336 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1337 #endif //ASSERT
1338
1339 // Finally, set up its entry points.
1340 assert(m->can_be_statically_bound(), "");
1341 m->set_vtable_index(Method::nonvirtual_vtable_index);
1342 m->link_method(m, CHECK_(empty));
1343
1344 if (TraceMethodHandles && (Verbose || WizardMode)) {
1345 ttyLocker ttyl;
1346 m->print_on(tty);
1347 }
1348
1349 return m;
1350 }
1351
1352 Klass* Method::check_non_bcp_klass(Klass* klass) {
1353 if (klass != NULL && klass->class_loader() != NULL) {
1354 if (klass->is_objArray_klass())
1355 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1356 return klass;
1357 }
1358 return NULL;
1359 }
1360
1361
1362 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1363 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1364 // Code below does not work for native methods - they should never get rewritten anyway
1365 assert(!m->is_native(), "cannot rewrite native methods");
1366 // Allocate new Method*
1367 AccessFlags flags = m->access_flags();
1368
1369 ConstMethod* cm = m->constMethod();
1370 int checked_exceptions_len = cm->checked_exceptions_length();
1371 int localvariable_len = cm->localvariable_table_length();
1372 int exception_table_len = cm->exception_table_length();
1373 int method_parameters_len = cm->method_parameters_length();
1374 int method_annotations_len = cm->method_annotations_length();
1375 int parameter_annotations_len = cm->parameter_annotations_length();
1376 int type_annotations_len = cm->type_annotations_length();
1377 int default_annotations_len = cm->default_annotations_length();
1378
1379 InlineTableSizes sizes(
1380 localvariable_len,
1381 new_compressed_linenumber_size,
1382 exception_table_len,
1383 checked_exceptions_len,
1384 method_parameters_len,
1385 cm->generic_signature_index(),
1386 method_annotations_len,
1387 parameter_annotations_len,
1388 type_annotations_len,
1389 default_annotations_len,
1390 0);
1391
1392 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1393 Method* newm_oop = Method::allocate(loader_data,
1394 new_code_length,
1395 flags,
1396 &sizes,
1397 m->method_type(),
1398 CHECK_(methodHandle()));
1399 methodHandle newm (THREAD, newm_oop);
1400
1401 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1402 ConstMethod* newcm = newm->constMethod();
1403 int new_const_method_size = newm->constMethod()->size();
1404
1405 // This works because the source and target are both Methods. Some compilers
1406 // (e.g., clang) complain that the target vtable pointer will be stomped,
1407 // so cast away newm()'s and m()'s Methodness.
1408 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1409
1410 // Create shallow copy of ConstMethod.
1411 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1412
1413 // Reset correct method/const method, method size, and parameter info
1414 newm->set_constMethod(newcm);
1415 newm->constMethod()->set_code_size(new_code_length);
1416 newm->constMethod()->set_constMethod_size(new_const_method_size);
1417 assert(newm->code_size() == new_code_length, "check");
1418 assert(newm->method_parameters_length() == method_parameters_len, "check");
1419 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1420 assert(newm->exception_table_length() == exception_table_len, "check");
1421 assert(newm->localvariable_table_length() == localvariable_len, "check");
1422 // Copy new byte codes
1423 memcpy(newm->code_base(), new_code, new_code_length);
1424 // Copy line number table
1425 if (new_compressed_linenumber_size > 0) {
1426 memcpy(newm->compressed_linenumber_table(),
1427 new_compressed_linenumber_table,
1428 new_compressed_linenumber_size);
1429 }
1430 // Copy method_parameters
1431 if (method_parameters_len > 0) {
1432 memcpy(newm->method_parameters_start(),
1433 m->method_parameters_start(),
1434 method_parameters_len * sizeof(MethodParametersElement));
1435 }
1436 // Copy checked_exceptions
1437 if (checked_exceptions_len > 0) {
1438 memcpy(newm->checked_exceptions_start(),
1439 m->checked_exceptions_start(),
1440 checked_exceptions_len * sizeof(CheckedExceptionElement));
1441 }
1442 // Copy exception table
1443 if (exception_table_len > 0) {
1444 memcpy(newm->exception_table_start(),
1445 m->exception_table_start(),
1446 exception_table_len * sizeof(ExceptionTableElement));
1447 }
1448 // Copy local variable number table
1449 if (localvariable_len > 0) {
1450 memcpy(newm->localvariable_table_start(),
1451 m->localvariable_table_start(),
1452 localvariable_len * sizeof(LocalVariableTableElement));
1453 }
1454 // Copy stackmap table
1455 if (m->has_stackmap_table()) {
1456 int code_attribute_length = m->stackmap_data()->length();
1457 Array<u1>* stackmap_data =
1458 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1459 memcpy((void*)stackmap_data->adr_at(0),
1460 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1461 newm->set_stackmap_data(stackmap_data);
1462 }
1463
1464 // copy annotations over to new method
1465 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL);
1466 return newm;
1467 }
1468
1469 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) {
1470 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1471 // because we are not loading from core libraries
1472 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1473 // which does not use the class default class loader so we check for its loader here
1474 const InstanceKlass* ik = InstanceKlass::cast(holder);
1475 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1476 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1477 }
1478
1479 // see if the klass name is well-known:
1480 Symbol* klass_name = ik->name();
1481 return vmSymbols::find_sid(klass_name);
1482 }
1483
1484 void Method::init_intrinsic_id() {
1485 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1486 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1487 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1488 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1489
1490 // the klass name is well-known:
1491 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1492 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1493
1494 // ditto for method and signature:
1495 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1496 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1497 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1498 && name_id == vmSymbols::NO_SID) {
1499 return;
1500 }
1501 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1502 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1503 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1504 && sig_id == vmSymbols::NO_SID) {
1505 return;
1506 }
1507 jshort flags = access_flags().as_short();
1508
1509 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1510 if (id != vmIntrinsics::_none) {
1511 set_intrinsic_id(id);
1512 if (id == vmIntrinsics::_Class_cast) {
1513 // Even if the intrinsic is rejected, we want to inline this simple method.
1514 set_force_inline(true);
1515 }
1516 return;
1517 }
1518
1519 // A few slightly irregular cases:
1520 switch (klass_id) {
1521 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1522 // Second chance: check in regular Math.
1523 switch (name_id) {
1524 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1525 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1526 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1527 // pretend it is the corresponding method in the non-strict class:
1528 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1529 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1530 break;
1531 default:
1532 break;
1533 }
1534 break;
1535
1536 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1537 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1538 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1539 if (!is_native()) break;
1540 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1541 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1542 id = vmIntrinsics::_none;
1543 break;
1544
1545 default:
1546 break;
1547 }
1548
1549 if (id != vmIntrinsics::_none) {
1550 // Set up its iid. It is an alias method.
1551 set_intrinsic_id(id);
1552 return;
1553 }
1554 }
1555
1556 // These two methods are static since a GC may move the Method
1557 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1558 if (!THREAD->can_call_java()) {
1559 // There is nothing useful this routine can do from within the Compile thread.
1560 // Hopefully, the signature contains only well-known classes.
1561 // We could scan for this and return true/false, but the caller won't care.
1562 return false;
1563 }
1564 bool sig_is_loaded = true;
1565 Handle class_loader(THREAD, m->method_holder()->class_loader());
1566 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1567 ResourceMark rm(THREAD);
1568 Symbol* signature = m->signature();
1569 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1570 if (ss.is_object()) {
1571 Symbol* sym = ss.as_symbol(CHECK_(false));
1572 Symbol* name = sym;
1573 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1574 protection_domain, THREAD);
1575 // We are loading classes eagerly. If a ClassNotFoundException or
1576 // a LinkageError was generated, be sure to ignore it.
1577 if (HAS_PENDING_EXCEPTION) {
1578 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1579 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1580 CLEAR_PENDING_EXCEPTION;
1581 } else {
1582 return false;
1583 }
1584 }
1585 if( klass == NULL) { sig_is_loaded = false; }
1586 }
1587 }
1588 return sig_is_loaded;
1589 }
1590
1591 bool Method::has_unloaded_classes_in_signature(const methodHandle& m, TRAPS) {
1592 Handle class_loader(THREAD, m->method_holder()->class_loader());
1593 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1594 ResourceMark rm(THREAD);
1595 Symbol* signature = m->signature();
1596 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1597 if (ss.type() == T_OBJECT) {
1598 Symbol* name = ss.as_symbol_or_null();
1599 if (name == NULL) return true;
1600 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1601 if (klass == NULL) return true;
1602 }
1603 }
1604 return false;
1605 }
1606
1607 // Exposed so field engineers can debug VM
1608 void Method::print_short_name(outputStream* st) {
1609 ResourceMark rm;
1610 #ifdef PRODUCT
1611 st->print(" %s::", method_holder()->external_name());
1612 #else
1613 st->print(" %s::", method_holder()->internal_name());
1614 #endif
1615 name()->print_symbol_on(st);
1616 if (WizardMode) signature()->print_symbol_on(st);
1617 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1618 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1619 }
1620
1621 // Comparer for sorting an object array containing
1622 // Method*s.
1623 static int method_comparator(Method* a, Method* b) {
1624 return a->name()->fast_compare(b->name());
1625 }
1626
1627 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1628 // default_methods also uses this without the ordering for fast find_method
1629 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1630 int length = methods->length();
1631 if (length > 1) {
1632 {
1633 NoSafepointVerifier nsv;
1634 QuickSort::sort(methods->data(), length, method_comparator, idempotent);
1635 }
1636 // Reset method ordering
1637 if (set_idnums) {
1638 for (int i = 0; i < length; i++) {
1639 Method* m = methods->at(i);
1640 m->set_method_idnum(i);
1641 m->set_orig_method_idnum(i);
1642 }
1643 }
1644 }
1645 }
1646
1647 //-----------------------------------------------------------------------------------
1648 // Non-product code unless JVM/TI needs it
1649
1650 #if !defined(PRODUCT) || INCLUDE_JVMTI
1651 class SignatureTypePrinter : public SignatureTypeNames {
1652 private:
1653 outputStream* _st;
1654 bool _use_separator;
1655
1656 void type_name(const char* name) {
1657 if (_use_separator) _st->print(", ");
1658 _st->print("%s", name);
1659 _use_separator = true;
1660 }
1661
1662 public:
1663 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1664 _st = st;
1665 _use_separator = false;
1666 }
1667
1668 void print_parameters() { _use_separator = false; iterate_parameters(); }
1669 void print_returntype() { _use_separator = false; iterate_returntype(); }
1670 };
1671
1672
1673 void Method::print_name(outputStream* st) {
1674 Thread *thread = Thread::current();
1675 ResourceMark rm(thread);
1676 st->print("%s ", is_static() ? "static" : "virtual");
1677 if (WizardMode) {
1678 st->print("%s.", method_holder()->internal_name());
1679 name()->print_symbol_on(st);
1680 signature()->print_symbol_on(st);
1681 } else {
1682 SignatureTypePrinter sig(signature(), st);
1683 sig.print_returntype();
1684 st->print(" %s.", method_holder()->internal_name());
1685 name()->print_symbol_on(st);
1686 st->print("(");
1687 sig.print_parameters();
1688 st->print(")");
1689 }
1690 }
1691 #endif // !PRODUCT || INCLUDE_JVMTI
1692
1693
1694 void Method::print_codes_on(outputStream* st) const {
1695 print_codes_on(0, code_size(), st);
1696 }
1697
1698 void Method::print_codes_on(int from, int to, outputStream* st) const {
1699 Thread *thread = Thread::current();
1700 ResourceMark rm(thread);
1701 methodHandle mh (thread, (Method*)this);
1702 BytecodeStream s(mh);
1703 s.set_interval(from, to);
1704 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1705 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1706 }
1707
1708
1709 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1710 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1711 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1712 // as end-of-stream terminator.
1713
1714 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1715 // bci and line number does not compress into single byte.
1716 // Write out escape character and use regular compression for bci and line number.
1717 write_byte((jubyte)0xFF);
1718 write_signed_int(bci_delta);
1719 write_signed_int(line_delta);
1720 }
1721
1722 // See comment in method.hpp which explains why this exists.
1723 #if defined(_M_AMD64) && _MSC_VER >= 1400
1724 #pragma optimize("", off)
1725 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1726 write_pair_inline(bci, line);
1727 }
1728 #pragma optimize("", on)
1729 #endif
1730
1731 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1732 _bci = 0;
1733 _line = 0;
1734 };
1735
1736
1737 bool CompressedLineNumberReadStream::read_pair() {
1738 jubyte next = read_byte();
1739 // Check for terminator
1740 if (next == 0) return false;
1741 if (next == 0xFF) {
1742 // Escape character, regular compression used
1743 _bci += read_signed_int();
1744 _line += read_signed_int();
1745 } else {
1746 // Single byte compression used
1747 _bci += next >> 3;
1748 _line += next & 0x7;
1749 }
1750 return true;
1751 }
1752
1753 #if INCLUDE_JVMTI
1754
1755 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1756 BreakpointInfo* bp = method_holder()->breakpoints();
1757 for (; bp != NULL; bp = bp->next()) {
1758 if (bp->match(this, bci)) {
1759 return bp->orig_bytecode();
1760 }
1761 }
1762 {
1763 ResourceMark rm;
1764 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1765 }
1766 return Bytecodes::_shouldnotreachhere;
1767 }
1768
1769 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1770 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1771 BreakpointInfo* bp = method_holder()->breakpoints();
1772 for (; bp != NULL; bp = bp->next()) {
1773 if (bp->match(this, bci)) {
1774 bp->set_orig_bytecode(code);
1775 // and continue, in case there is more than one
1776 }
1777 }
1778 }
1779
1780 void Method::set_breakpoint(int bci) {
1781 InstanceKlass* ik = method_holder();
1782 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1783 bp->set_next(ik->breakpoints());
1784 ik->set_breakpoints(bp);
1785 // do this last:
1786 bp->set(this);
1787 }
1788
1789 static void clear_matches(Method* m, int bci) {
1790 InstanceKlass* ik = m->method_holder();
1791 BreakpointInfo* prev_bp = NULL;
1792 BreakpointInfo* next_bp;
1793 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1794 next_bp = bp->next();
1795 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1796 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1797 // do this first:
1798 bp->clear(m);
1799 // unhook it
1800 if (prev_bp != NULL)
1801 prev_bp->set_next(next_bp);
1802 else
1803 ik->set_breakpoints(next_bp);
1804 delete bp;
1805 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1806 // at same location. So we have multiple matching (method_index and bci)
1807 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1808 // breakpoint for clear_breakpoint request and keep all other method versions
1809 // BreakpointInfo for future clear_breakpoint request.
1810 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1811 // which is being called when class is unloaded. We delete all the Breakpoint
1812 // information for all versions of method. We may not correctly restore the original
1813 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1814 // so these methods won't be used anymore.
1815 if (bci >= 0) {
1816 break;
1817 }
1818 } else {
1819 // This one is a keeper.
1820 prev_bp = bp;
1821 }
1822 }
1823 }
1824
1825 void Method::clear_breakpoint(int bci) {
1826 assert(bci >= 0, "");
1827 clear_matches(this, bci);
1828 }
1829
1830 void Method::clear_all_breakpoints() {
1831 clear_matches(this, -1);
1832 }
1833
1834 #endif // INCLUDE_JVMTI
1835
1836 int Method::invocation_count() {
1837 MethodCounters *mcs = method_counters();
1838 if (TieredCompilation) {
1839 MethodData* const mdo = method_data();
1840 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1841 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1842 return InvocationCounter::count_limit;
1843 } else {
1844 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1845 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1846 }
1847 } else {
1848 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1849 }
1850 }
1851
1852 int Method::backedge_count() {
1853 MethodCounters *mcs = method_counters();
1854 if (TieredCompilation) {
1855 MethodData* const mdo = method_data();
1856 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1857 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1858 return InvocationCounter::count_limit;
1859 } else {
1860 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1861 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1862 }
1863 } else {
1864 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1865 }
1866 }
1867
1868 int Method::highest_comp_level() const {
1869 const MethodCounters* mcs = method_counters();
1870 if (mcs != NULL) {
1871 return mcs->highest_comp_level();
1872 } else {
1873 return CompLevel_none;
1874 }
1875 }
1876
1877 int Method::highest_osr_comp_level() const {
1878 const MethodCounters* mcs = method_counters();
1879 if (mcs != NULL) {
1880 return mcs->highest_osr_comp_level();
1881 } else {
1882 return CompLevel_none;
1883 }
1884 }
1885
1886 void Method::set_highest_comp_level(int level) {
1887 MethodCounters* mcs = method_counters();
1888 if (mcs != NULL) {
1889 mcs->set_highest_comp_level(level);
1890 }
1891 }
1892
1893 void Method::set_highest_osr_comp_level(int level) {
1894 MethodCounters* mcs = method_counters();
1895 if (mcs != NULL) {
1896 mcs->set_highest_osr_comp_level(level);
1897 }
1898 }
1899
1900 #if INCLUDE_JVMTI
1901
1902 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1903 _bci = bci;
1904 _name_index = m->name_index();
1905 _signature_index = m->signature_index();
1906 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1907 if (_orig_bytecode == Bytecodes::_breakpoint)
1908 _orig_bytecode = m->orig_bytecode_at(_bci);
1909 _next = NULL;
1910 }
1911
1912 void BreakpointInfo::set(Method* method) {
1913 #ifdef ASSERT
1914 {
1915 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1916 if (code == Bytecodes::_breakpoint)
1917 code = method->orig_bytecode_at(_bci);
1918 assert(orig_bytecode() == code, "original bytecode must be the same");
1919 }
1920 #endif
1921 Thread *thread = Thread::current();
1922 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1923 method->incr_number_of_breakpoints(thread);
1924 SystemDictionary::notice_modification();
1925 {
1926 // Deoptimize all dependents on this method
1927 HandleMark hm(thread);
1928 methodHandle mh(thread, method);
1929 CodeCache::flush_dependents_on_method(mh);
1930 }
1931 }
1932
1933 void BreakpointInfo::clear(Method* method) {
1934 *method->bcp_from(_bci) = orig_bytecode();
1935 assert(method->number_of_breakpoints() > 0, "must not go negative");
1936 method->decr_number_of_breakpoints(Thread::current());
1937 }
1938
1939 #endif // INCLUDE_JVMTI
1940
1941 // jmethodID handling
1942
1943 // This is a block allocating object, sort of like JNIHandleBlock, only a
1944 // lot simpler.
1945 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1946 // never get rid of it.
1947
1948 static const int min_block_size = 8;
1949
1950 class JNIMethodBlockNode : public CHeapObj<mtClass> {
1951 friend class JNIMethodBlock;
1952 Method** _methods;
1953 int _number_of_methods;
1954 int _top;
1955 JNIMethodBlockNode* _next;
1956
1957 public:
1958
1959 JNIMethodBlockNode(int num_methods = min_block_size);
1960
1961 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
1962
1963 void ensure_methods(int num_addl_methods) {
1964 if (_top < _number_of_methods) {
1965 num_addl_methods -= _number_of_methods - _top;
1966 if (num_addl_methods <= 0) {
1967 return;
1968 }
1969 }
1970 if (_next == NULL) {
1971 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
1972 } else {
1973 _next->ensure_methods(num_addl_methods);
1974 }
1975 }
1976 };
1977
1978 class JNIMethodBlock : public CHeapObj<mtClass> {
1979 JNIMethodBlockNode _head;
1980 JNIMethodBlockNode *_last_free;
1981 public:
1982 static Method* const _free_method;
1983
1984 JNIMethodBlock(int initial_capacity = min_block_size)
1985 : _head(initial_capacity), _last_free(&_head) {}
1986
1987 void ensure_methods(int num_addl_methods) {
1988 _last_free->ensure_methods(num_addl_methods);
1989 }
1990
1991 Method** add_method(Method* m) {
1992 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) {
1993 if (b->_top < b->_number_of_methods) {
1994 // top points to the next free entry.
1995 int i = b->_top;
1996 b->_methods[i] = m;
1997 b->_top++;
1998 _last_free = b;
1999 return &(b->_methods[i]);
2000 } else if (b->_top == b->_number_of_methods) {
2001 // if the next free entry ran off the block see if there's a free entry
2002 for (int i = 0; i < b->_number_of_methods; i++) {
2003 if (b->_methods[i] == _free_method) {
2004 b->_methods[i] = m;
2005 _last_free = b;
2006 return &(b->_methods[i]);
2007 }
2008 }
2009 // Only check each block once for frees. They're very unlikely.
2010 // Increment top past the end of the block.
2011 b->_top++;
2012 }
2013 // need to allocate a next block.
2014 if (b->_next == NULL) {
2015 b->_next = _last_free = new JNIMethodBlockNode();
2016 }
2017 }
2018 guarantee(false, "Should always allocate a free block");
2019 return NULL;
2020 }
2021
2022 bool contains(Method** m) {
2023 if (m == NULL) return false;
2024 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2025 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2026 // This is a bit of extra checking, for two reasons. One is
2027 // that contains() deals with pointers that are passed in by
2028 // JNI code, so making sure that the pointer is aligned
2029 // correctly is valuable. The other is that <= and > are
2030 // technically not defined on pointers, so the if guard can
2031 // pass spuriously; no modern compiler is likely to make that
2032 // a problem, though (and if one did, the guard could also
2033 // fail spuriously, which would be bad).
2034 ptrdiff_t idx = m - b->_methods;
2035 if (b->_methods + idx == m) {
2036 return true;
2037 }
2038 }
2039 }
2040 return false; // not found
2041 }
2042
2043 // Doesn't really destroy it, just marks it as free so it can be reused.
2044 void destroy_method(Method** m) {
2045 #ifdef ASSERT
2046 assert(contains(m), "should be a methodID");
2047 #endif // ASSERT
2048 *m = _free_method;
2049 }
2050
2051 // During class unloading the methods are cleared, which is different
2052 // than freed.
2053 void clear_all_methods() {
2054 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2055 for (int i = 0; i< b->_number_of_methods; i++) {
2056 b->_methods[i] = NULL;
2057 }
2058 }
2059 }
2060 #ifndef PRODUCT
2061 int count_methods() {
2062 // count all allocated methods
2063 int count = 0;
2064 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2065 for (int i = 0; i< b->_number_of_methods; i++) {
2066 if (b->_methods[i] != _free_method) count++;
2067 }
2068 }
2069 return count;
2070 }
2071 #endif // PRODUCT
2072 };
2073
2074 // Something that can't be mistaken for an address or a markOop
2075 Method* const JNIMethodBlock::_free_method = (Method*)55;
2076
2077 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) {
2078 _number_of_methods = MAX2(num_methods, min_block_size);
2079 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2080 for (int i = 0; i < _number_of_methods; i++) {
2081 _methods[i] = JNIMethodBlock::_free_method;
2082 }
2083 }
2084
2085 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
2086 ClassLoaderData* cld = loader_data;
2087 if (!SafepointSynchronize::is_at_safepoint()) {
2088 // Have to add jmethod_ids() to class loader data thread-safely.
2089 // Also have to add the method to the list safely, which the cld lock
2090 // protects as well.
2091 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2092 if (cld->jmethod_ids() == NULL) {
2093 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2094 } else {
2095 cld->jmethod_ids()->ensure_methods(capacity);
2096 }
2097 } else {
2098 // At safepoint, we are single threaded and can set this.
2099 if (cld->jmethod_ids() == NULL) {
2100 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2101 } else {
2102 cld->jmethod_ids()->ensure_methods(capacity);
2103 }
2104 }
2105 }
2106
2107 // Add a method id to the jmethod_ids
2108 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
2109 ClassLoaderData* cld = loader_data;
2110
2111 if (!SafepointSynchronize::is_at_safepoint()) {
2112 // Have to add jmethod_ids() to class loader data thread-safely.
2113 // Also have to add the method to the list safely, which the cld lock
2114 // protects as well.
2115 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2116 if (cld->jmethod_ids() == NULL) {
2117 cld->set_jmethod_ids(new JNIMethodBlock());
2118 }
2119 // jmethodID is a pointer to Method*
2120 return (jmethodID)cld->jmethod_ids()->add_method(m);
2121 } else {
2122 // At safepoint, we are single threaded and can set this.
2123 if (cld->jmethod_ids() == NULL) {
2124 cld->set_jmethod_ids(new JNIMethodBlock());
2125 }
2126 // jmethodID is a pointer to Method*
2127 return (jmethodID)cld->jmethod_ids()->add_method(m);
2128 }
2129 }
2130
2131 // Mark a jmethodID as free. This is called when there is a data race in
2132 // InstanceKlass while creating the jmethodID cache.
2133 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
2134 ClassLoaderData* cld = loader_data;
2135 Method** ptr = (Method**)m;
2136 assert(cld->jmethod_ids() != NULL, "should have method handles");
2137 cld->jmethod_ids()->destroy_method(ptr);
2138 }
2139
2140 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2141 // Can't assert the method_holder is the same because the new method has the
2142 // scratch method holder.
2143 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2144 == new_method->method_holder()->class_loader(),
2145 "changing to a different class loader");
2146 // Just change the method in place, jmethodID pointer doesn't change.
2147 *((Method**)jmid) = new_method;
2148 }
2149
2150 bool Method::is_method_id(jmethodID mid) {
2151 Method* m = resolve_jmethod_id(mid);
2152 assert(m != NULL, "should be called with non-null method");
2153 InstanceKlass* ik = m->method_holder();
2154 ClassLoaderData* cld = ik->class_loader_data();
2155 if (cld->jmethod_ids() == NULL) return false;
2156 return (cld->jmethod_ids()->contains((Method**)mid));
2157 }
2158
2159 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2160 if (mid == NULL) return NULL;
2161 Method* o = resolve_jmethod_id(mid);
2162 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
2163 return NULL;
2164 }
2165 return o;
2166 };
2167
2168 void Method::set_on_stack(const bool value) {
2169 // Set both the method itself and its constant pool. The constant pool
2170 // on stack means some method referring to it is also on the stack.
2171 constants()->set_on_stack(value);
2172
2173 bool already_set = on_stack();
2174 _access_flags.set_on_stack(value);
2175 if (value && !already_set) {
2176 MetadataOnStackMark::record(this);
2177 }
2178 }
2179
2180 // Called when the class loader is unloaded to make all methods weak.
2181 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2182 loader_data->jmethod_ids()->clear_all_methods();
2183 }
2184
2185 bool Method::has_method_vptr(const void* ptr) {
2186 Method m;
2187 // This assumes that the vtbl pointer is the first word of a C++ object.
2188 return dereference_vptr(&m) == dereference_vptr(ptr);
2189 }
2190
2191 // Check that this pointer is valid by checking that the vtbl pointer matches
2192 bool Method::is_valid_method() const {
2193 if (this == NULL) {
2194 return false;
2195 } else if ((intptr_t(this) & (wordSize-1)) != 0) {
2196 // Quick sanity check on pointer.
2197 return false;
2198 } else if (MetaspaceShared::is_in_shared_space(this)) {
2199 return MetaspaceShared::is_valid_shared_method(this);
2200 } else if (Metaspace::contains_non_shared(this)) {
2201 return has_method_vptr((const void*)this);
2202 } else {
2203 return false;
2204 }
2205 }
2206
2207 #ifndef PRODUCT
2208 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
2209 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
2210 }
2211 #endif // PRODUCT
2212
2213
2214 // Printing
2215
2216 #ifndef PRODUCT
2217
2218 void Method::print_on(outputStream* st) const {
2219 ResourceMark rm;
2220 assert(is_method(), "must be method");
2221 st->print_cr("%s", internal_name());
2222 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this));
2223 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2224 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants()));
2225 constants()->print_value_on(st); st->cr();
2226 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2227 st->print (" - name: "); name()->print_value_on(st); st->cr();
2228 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2229 st->print_cr(" - max stack: %d", max_stack());
2230 st->print_cr(" - max locals: %d", max_locals());
2231 st->print_cr(" - size of params: %d", size_of_parameters());
2232 st->print_cr(" - method size: %d", method_size());
2233 if (intrinsic_id() != vmIntrinsics::_none)
2234 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
2235 if (highest_comp_level() != CompLevel_none)
2236 st->print_cr(" - highest level: %d", highest_comp_level());
2237 st->print_cr(" - vtable index: %d", _vtable_index);
2238 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry()));
2239 st->print( " - adapters: ");
2240 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2241 if (a == NULL)
2242 st->print_cr(INTPTR_FORMAT, p2i(a));
2243 else
2244 a->print_adapter_on(st);
2245 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry()));
2246 st->print_cr(" - code size: %d", code_size());
2247 if (code_size() != 0) {
2248 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base()));
2249 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size()));
2250 }
2251 if (method_data() != NULL) {
2252 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data()));
2253 }
2254 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2255 if (checked_exceptions_length() > 0) {
2256 CheckedExceptionElement* table = checked_exceptions_start();
2257 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table));
2258 if (Verbose) {
2259 for (int i = 0; i < checked_exceptions_length(); i++) {
2260 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2261 }
2262 }
2263 }
2264 if (has_linenumber_table()) {
2265 u_char* table = compressed_linenumber_table();
2266 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table));
2267 if (Verbose) {
2268 CompressedLineNumberReadStream stream(table);
2269 while (stream.read_pair()) {
2270 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2271 }
2272 }
2273 }
2274 st->print_cr(" - localvar length: %d", localvariable_table_length());
2275 if (localvariable_table_length() > 0) {
2276 LocalVariableTableElement* table = localvariable_table_start();
2277 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table));
2278 if (Verbose) {
2279 for (int i = 0; i < localvariable_table_length(); i++) {
2280 int bci = table[i].start_bci;
2281 int len = table[i].length;
2282 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2283 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2284 int slot = table[i].slot;
2285 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2286 }
2287 }
2288 }
2289 if (code() != NULL) {
2290 st->print (" - compiled code: ");
2291 code()->print_value_on(st);
2292 }
2293 if (is_native()) {
2294 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function()));
2295 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler()));
2296 }
2297 }
2298
2299 void Method::print_linkage_flags(outputStream* st) {
2300 access_flags().print_on(st);
2301 if (is_default_method()) {
2302 st->print("default ");
2303 }
2304 if (is_overpass()) {
2305 st->print("overpass ");
2306 }
2307 }
2308 #endif //PRODUCT
2309
2310 void Method::print_value_on(outputStream* st) const {
2311 assert(is_method(), "must be method");
2312 st->print("%s", internal_name());
2313 print_address_on(st);
2314 st->print(" ");
2315 name()->print_value_on(st);
2316 st->print(" ");
2317 signature()->print_value_on(st);
2318 st->print(" in ");
2319 method_holder()->print_value_on(st);
2320 if (WizardMode) st->print("#%d", _vtable_index);
2321 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2322 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2323 }
2324
2325 #if INCLUDE_SERVICES
2326 // Size Statistics
2327 void Method::collect_statistics(KlassSizeStats *sz) const {
2328 int mysize = sz->count(this);
2329 sz->_method_bytes += mysize;
2330 sz->_method_all_bytes += mysize;
2331 sz->_rw_bytes += mysize;
2332
2333 if (constMethod()) {
2334 constMethod()->collect_statistics(sz);
2335 }
2336 if (method_data()) {
2337 method_data()->collect_statistics(sz);
2338 }
2339 }
2340 #endif // INCLUDE_SERVICES
2341
2342 // LogTouchedMethods and PrintTouchedMethods
2343
2344 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because
2345 // the Method may be garbage collected. Let's roll our own hash table.
2346 class TouchedMethodRecord : CHeapObj<mtTracing> {
2347 public:
2348 // It's OK to store Symbols here because they will NOT be GC'ed if
2349 // LogTouchedMethods is enabled.
2350 TouchedMethodRecord* _next;
2351 Symbol* _class_name;
2352 Symbol* _method_name;
2353 Symbol* _method_signature;
2354 };
2355
2356 static const int TOUCHED_METHOD_TABLE_SIZE = 20011;
2357 static TouchedMethodRecord** _touched_method_table = NULL;
2358
2359 void Method::log_touched(TRAPS) {
2360
2361 const int table_size = TOUCHED_METHOD_TABLE_SIZE;
2362 Symbol* my_class = klass_name();
2363 Symbol* my_name = name();
2364 Symbol* my_sig = signature();
2365
2366 unsigned int hash = my_class->identity_hash() +
2367 my_name->identity_hash() +
2368 my_sig->identity_hash();
2369 juint index = juint(hash) % table_size;
2370
2371 MutexLocker ml(TouchedMethodLog_lock, THREAD);
2372 if (_touched_method_table == NULL) {
2373 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size,
2374 mtTracing, CURRENT_PC);
2375 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size);
2376 }
2377
2378 TouchedMethodRecord* ptr = _touched_method_table[index];
2379 while (ptr) {
2380 if (ptr->_class_name == my_class &&
2381 ptr->_method_name == my_name &&
2382 ptr->_method_signature == my_sig) {
2383 return;
2384 }
2385 if (ptr->_next == NULL) break;
2386 ptr = ptr->_next;
2387 }
2388 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing);
2389 my_class->set_permanent(); // prevent reclaimed by GC
2390 my_name->set_permanent();
2391 my_sig->set_permanent();
2392 nptr->_class_name = my_class;
2393 nptr->_method_name = my_name;
2394 nptr->_method_signature = my_sig;
2395 nptr->_next = NULL;
2396
2397 if (ptr == NULL) {
2398 // first
2399 _touched_method_table[index] = nptr;
2400 } else {
2401 ptr->_next = nptr;
2402 }
2403 }
2404
2405 void Method::print_touched_methods(outputStream* out) {
2406 MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock);
2407 out->print_cr("# Method::print_touched_methods version 1");
2408 if (_touched_method_table) {
2409 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) {
2410 TouchedMethodRecord* ptr = _touched_method_table[i];
2411 while(ptr) {
2412 ptr->_class_name->print_symbol_on(out); out->print(".");
2413 ptr->_method_name->print_symbol_on(out); out->print(":");
2414 ptr->_method_signature->print_symbol_on(out); out->cr();
2415 ptr = ptr->_next;
2416 }
2417 }
2418 }
2419 }
2420
2421 // Verification
2422
2423 void Method::verify_on(outputStream* st) {
2424 guarantee(is_method(), "object must be method");
2425 guarantee(constants()->is_constantPool(), "should be constant pool");
2426 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2427 MethodData* md = method_data();
2428 guarantee(md == NULL ||
2429 md->is_methodData(), "should be method data");
2430 }