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/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/vmError.hpp"
63 #include "utilities/xmlstream.hpp"
64
65 // Implementation of Method
66
67 Method* Method::allocate(ClassLoaderData* loader_data,
68 int byte_code_size,
69 AccessFlags access_flags,
70 InlineTableSizes* sizes,
71 ConstMethod::MethodType method_type,
72 TRAPS) {
73 assert(!access_flags.is_native() || byte_code_size == 0,
74 "native methods should not contain byte codes");
75 ConstMethod* cm = ConstMethod::allocate(loader_data,
76 byte_code_size,
77 sizes,
78 method_type,
79 CHECK_NULL);
80 int size = Method::size(access_flags.is_native());
81 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags);
82 }
83
84 Method::Method(ConstMethod* xconst, AccessFlags access_flags) {
85 NoSafepointVerifier no_safepoint;
86 set_constMethod(xconst);
87 set_access_flags(access_flags);
88 set_intrinsic_id(vmIntrinsics::_none);
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(false /* don't need a lock */); // 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, Klass* 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 == 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 assert(k != NULL, "klass not loaded");
204 if (ex_klass->is_subtype_of(k)) {
205 return handler_bci;
206 }
207 }
208 }
209 }
210
211 return -1;
212 }
213
214 void Method::mask_for(int bci, InterpreterOopMap* mask) {
215
216 Thread* myThread = Thread::current();
217 methodHandle h_this(myThread, this);
218 #if defined(ASSERT) && !INCLUDE_JVMCI
219 bool has_capability = myThread->is_VM_thread() ||
220 myThread->is_ConcurrentGC_thread() ||
221 myThread->is_GC_task_thread();
222
223 if (!has_capability) {
224 if (!VerifyStack && !VerifyLastFrame) {
225 // verify stack calls this outside VM thread
226 warning("oopmap should only be accessed by the "
227 "VM, GC task or CMS threads (or during debugging)");
228 InterpreterOopMap local_mask;
229 method_holder()->mask_for(h_this, bci, &local_mask);
230 local_mask.print();
231 }
232 }
233 #endif
234 method_holder()->mask_for(h_this, bci, mask);
235 return;
236 }
237
238
239 int Method::bci_from(address bcp) const {
240 if (is_native() && bcp == 0) {
241 return 0;
242 }
243 #ifdef ASSERT
244 {
245 ResourceMark rm;
246 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(),
247 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s",
248 p2i(bcp), name_and_sig_as_C_string());
249 }
250 #endif
251 return bcp - code_base();
252 }
253
254
255 int Method::validate_bci(int bci) const {
256 return (bci == 0 || bci < code_size()) ? bci : -1;
257 }
258
259 // Return bci if it appears to be a valid bcp
260 // Return -1 otherwise.
261 // Used by profiling code, when invalid data is a possibility.
262 // The caller is responsible for validating the Method* itself.
263 int Method::validate_bci_from_bcp(address bcp) const {
264 // keep bci as -1 if not a valid bci
265 int bci = -1;
266 if (bcp == 0 || bcp == code_base()) {
267 // code_size() may return 0 and we allow 0 here
268 // the method may be native
269 bci = 0;
270 } else if (contains(bcp)) {
271 bci = bcp - code_base();
272 }
273 // Assert that if we have dodged any asserts, bci is negative.
274 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
275 return bci;
276 }
277
278 address Method::bcp_from(int bci) const {
279 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
280 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
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 in classes 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() && !is_private()) {
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 == is_private(),
587 "nonvirtual unexpected for non-static, non-private: %s",
588 name_and_sig_as_C_string());
589 }
590 #endif
591 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
592 return vtable_index() == nonvirtual_vtable_index;
593 }
594
595 bool Method::can_be_statically_bound() const {
596 return can_be_statically_bound(method_holder()->access_flags());
597 }
598
599 bool Method::is_accessor() const {
600 return is_getter() || is_setter();
601 }
602
603 bool Method::is_getter() const {
604 if (code_size() != 5) return false;
605 if (size_of_parameters() != 1) return false;
606 if (java_code_at(0) != Bytecodes::_aload_0) return false;
607 if (java_code_at(1) != Bytecodes::_getfield) return false;
608 switch (java_code_at(4)) {
609 case Bytecodes::_ireturn:
610 case Bytecodes::_lreturn:
611 case Bytecodes::_freturn:
612 case Bytecodes::_dreturn:
613 case Bytecodes::_areturn:
614 break;
615 default:
616 return false;
617 }
618 return true;
619 }
620
621 bool Method::is_setter() const {
622 if (code_size() != 6) return false;
623 if (java_code_at(0) != Bytecodes::_aload_0) return false;
624 switch (java_code_at(1)) {
625 case Bytecodes::_iload_1:
626 case Bytecodes::_aload_1:
627 case Bytecodes::_fload_1:
628 if (size_of_parameters() != 2) return false;
629 break;
630 case Bytecodes::_dload_1:
631 case Bytecodes::_lload_1:
632 if (size_of_parameters() != 3) return false;
633 break;
634 default:
635 return false;
636 }
637 if (java_code_at(2) != Bytecodes::_putfield) return false;
638 if (java_code_at(5) != Bytecodes::_return) return false;
639 return true;
640 }
641
642 bool Method::is_constant_getter() const {
643 int last_index = code_size() - 1;
644 // Check if the first 1-3 bytecodes are a constant push
645 // and the last bytecode is a return.
646 return (2 <= code_size() && code_size() <= 4 &&
647 Bytecodes::is_const(java_code_at(0)) &&
648 Bytecodes::length_for(java_code_at(0)) == last_index &&
649 Bytecodes::is_return(java_code_at(last_index)));
650 }
651
652 bool Method::is_initializer() const {
653 return is_object_initializer() || is_static_initializer();
654 }
655
656 bool Method::has_valid_initializer_flags() const {
657 return (is_static() ||
658 method_holder()->major_version() < 51);
659 }
660
661 bool Method::is_static_initializer() const {
662 // For classfiles version 51 or greater, ensure that the clinit method is
663 // static. Non-static methods with the name "<clinit>" are not static
664 // initializers. (older classfiles exempted for backward compatibility)
665 return name() == vmSymbols::class_initializer_name() &&
666 has_valid_initializer_flags();
667 }
668
669 bool Method::is_object_initializer() const {
670 return name() == vmSymbols::object_initializer_name();
671 }
672
673 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
674 int length = method->checked_exceptions_length();
675 if (length == 0) { // common case
676 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
677 } else {
678 methodHandle h_this(THREAD, method);
679 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
680 objArrayHandle mirrors (THREAD, m_oop);
681 for (int i = 0; i < length; i++) {
682 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
683 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
684 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
685 mirrors->obj_at_put(i, k->java_mirror());
686 }
687 return mirrors;
688 }
689 };
690
691
692 int Method::line_number_from_bci(int bci) const {
693 if (bci == SynchronizationEntryBCI) bci = 0;
694 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
695 int best_bci = 0;
696 int best_line = -1;
697
698 if (has_linenumber_table()) {
699 // The line numbers are a short array of 2-tuples [start_pc, line_number].
700 // Not necessarily sorted and not necessarily one-to-one.
701 CompressedLineNumberReadStream stream(compressed_linenumber_table());
702 while (stream.read_pair()) {
703 if (stream.bci() == bci) {
704 // perfect match
705 return stream.line();
706 } else {
707 // update best_bci/line
708 if (stream.bci() < bci && stream.bci() >= best_bci) {
709 best_bci = stream.bci();
710 best_line = stream.line();
711 }
712 }
713 }
714 }
715 return best_line;
716 }
717
718
719 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
720 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
721 Thread *thread = Thread::current();
722 Symbol* klass_name = constants()->klass_name_at(klass_index);
723 Handle loader(thread, method_holder()->class_loader());
724 Handle prot (thread, method_holder()->protection_domain());
725 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
726 } else {
727 return true;
728 }
729 }
730
731
732 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
733 int klass_index = constants()->klass_ref_index_at(refinfo_index);
734 if (must_be_resolved) {
735 // Make sure klass is resolved in constantpool.
736 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
737 }
738 return is_klass_loaded_by_klass_index(klass_index);
739 }
740
741
742 void Method::set_native_function(address function, bool post_event_flag) {
743 assert(function != NULL, "use clear_native_function to unregister natives");
744 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
745 address* native_function = native_function_addr();
746
747 // We can see racers trying to place the same native function into place. Once
748 // is plenty.
749 address current = *native_function;
750 if (current == function) return;
751 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
752 function != NULL) {
753 // native_method_throw_unsatisfied_link_error_entry() should only
754 // be passed when post_event_flag is false.
755 assert(function !=
756 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
757 "post_event_flag mis-match");
758
759 // post the bind event, and possible change the bind function
760 JvmtiExport::post_native_method_bind(this, &function);
761 }
762 *native_function = function;
763 // This function can be called more than once. We must make sure that we always
764 // use the latest registered method -> check if a stub already has been generated.
765 // If so, we have to make it not_entrant.
766 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
767 if (nm != NULL) {
768 nm->make_not_entrant();
769 }
770 }
771
772
773 bool Method::has_native_function() const {
774 if (is_method_handle_intrinsic())
775 return false; // special-cased in SharedRuntime::generate_native_wrapper
776 address func = native_function();
777 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
778 }
779
780
781 void Method::clear_native_function() {
782 // Note: is_method_handle_intrinsic() is allowed here.
783 set_native_function(
784 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
785 !native_bind_event_is_interesting);
786 clear_code();
787 }
788
789 address Method::critical_native_function() {
790 methodHandle mh(this);
791 return NativeLookup::lookup_critical_entry(mh);
792 }
793
794
795 void Method::set_signature_handler(address handler) {
796 address* signature_handler = signature_handler_addr();
797 *signature_handler = handler;
798 }
799
800
801 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
802 if (PrintCompilation && report) {
803 ttyLocker ttyl;
804 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
805 if (comp_level == CompLevel_all) {
806 tty->print("all levels ");
807 } else {
808 tty->print("levels ");
809 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
810 tty->print("%d ", i);
811 }
812 }
813 this->print_short_name(tty);
814 int size = this->code_size();
815 if (size > 0) {
816 tty->print(" (%d bytes)", size);
817 }
818 if (reason != NULL) {
819 tty->print(" %s", reason);
820 }
821 tty->cr();
822 }
823 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
824 ttyLocker ttyl;
825 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
826 os::current_thread_id(), is_osr, comp_level);
827 if (reason != NULL) {
828 xtty->print(" reason=\'%s\'", reason);
829 }
830 xtty->method(this);
831 xtty->stamp();
832 xtty->end_elem();
833 }
834 }
835
836 bool Method::is_always_compilable() const {
837 // Generated adapters must be compiled
838 if (is_method_handle_intrinsic() && is_synthetic()) {
839 assert(!is_not_c1_compilable(), "sanity check");
840 assert(!is_not_c2_compilable(), "sanity check");
841 return true;
842 }
843
844 return false;
845 }
846
847 bool Method::is_not_compilable(int comp_level) const {
848 if (number_of_breakpoints() > 0)
849 return true;
850 if (is_always_compilable())
851 return false;
852 if (comp_level == CompLevel_any)
853 return is_not_c1_compilable() || is_not_c2_compilable();
854 if (is_c1_compile(comp_level))
855 return is_not_c1_compilable();
856 if (is_c2_compile(comp_level))
857 return is_not_c2_compilable();
858 return false;
859 }
860
861 // call this when compiler finds that this method is not compilable
862 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
863 if (is_always_compilable()) {
864 // Don't mark a method which should be always compilable
865 return;
866 }
867 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
868 if (comp_level == CompLevel_all) {
869 set_not_c1_compilable();
870 set_not_c2_compilable();
871 } else {
872 if (is_c1_compile(comp_level))
873 set_not_c1_compilable();
874 if (is_c2_compile(comp_level))
875 set_not_c2_compilable();
876 }
877 CompilationPolicy::policy()->disable_compilation(this);
878 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
879 }
880
881 bool Method::is_not_osr_compilable(int comp_level) const {
882 if (is_not_compilable(comp_level))
883 return true;
884 if (comp_level == CompLevel_any)
885 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
886 if (is_c1_compile(comp_level))
887 return is_not_c1_osr_compilable();
888 if (is_c2_compile(comp_level))
889 return is_not_c2_osr_compilable();
890 return false;
891 }
892
893 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
894 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
895 if (comp_level == CompLevel_all) {
896 set_not_c1_osr_compilable();
897 set_not_c2_osr_compilable();
898 } else {
899 if (is_c1_compile(comp_level))
900 set_not_c1_osr_compilable();
901 if (is_c2_compile(comp_level))
902 set_not_c2_osr_compilable();
903 }
904 CompilationPolicy::policy()->disable_compilation(this);
905 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
906 }
907
908 // Revert to using the interpreter and clear out the nmethod
909 void Method::clear_code(bool acquire_lock /* = true */) {
910 MutexLockerEx pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag);
911 // this may be NULL if c2i adapters have not been made yet
912 // Only should happen at allocate time.
913 if (adapter() == NULL) {
914 _from_compiled_entry = NULL;
915 } else {
916 _from_compiled_entry = adapter()->get_c2i_entry();
917 }
918 OrderAccess::storestore();
919 _from_interpreted_entry = _i2i_entry;
920 OrderAccess::storestore();
921 _code = NULL;
922 }
923
924 #if INCLUDE_CDS
925 // Called by class data sharing to remove any entry points (which are not shared)
926 void Method::unlink_method() {
927 _code = NULL;
928
929 assert(DumpSharedSpaces, "dump time only");
930 // Set the values to what they should be at run time. Note that
931 // this Method can no longer be executed during dump time.
932 _i2i_entry = Interpreter::entry_for_cds_method(this);
933 _from_interpreted_entry = _i2i_entry;
934
935 if (is_native()) {
936 *native_function_addr() = NULL;
937 set_signature_handler(NULL);
938 }
939 NOT_PRODUCT(set_compiled_invocation_count(0);)
940
941 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter();
942 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline());
943 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline();
944 assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time");
945
946
947 // In case of DumpSharedSpaces, _method_data should always be NULL.
948 assert(_method_data == NULL, "unexpected method data?");
949
950 set_method_data(NULL);
951 clear_method_counters();
952 }
953 #endif
954
955 /****************************************************************************
956 // The following illustrates how the entries work for CDS shared Methods:
957 //
958 // Our goal is to delay writing into a shared Method until it's compiled.
959 // Hence, we want to determine the initial values for _i2i_entry,
960 // _from_interpreted_entry and _from_compiled_entry during CDS dump time.
961 //
962 // In this example, both Methods A and B have the _i2i_entry of "zero_locals".
963 // They also have similar signatures so that they will share the same
964 // AdapterHandlerEntry.
965 //
966 // _adapter_trampoline points to a fixed location in the RW section of
967 // the CDS archive. This location initially contains a NULL pointer. When the
968 // first of method A or B is linked, an AdapterHandlerEntry is allocated
969 // dynamically, and its c2i/i2c entries are generated.
970 //
971 // _i2i_entry and _from_interpreted_entry initially points to the same
972 // (fixed) location in the CODE section of the CDS archive. This contains
973 // an unconditional branch to the actual entry for "zero_locals", which is
974 // generated at run time and may be on an arbitrary address. Thus, the
975 // unconditional branch is also generated at run time to jump to the correct
976 // address.
977 //
978 // Similarly, _from_compiled_entry points to a fixed address in the CODE
979 // section. This address has enough space for an unconditional branch
980 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is
981 // initialized, and the address for the actual c2i_entry is known, we emit a
982 // branch instruction here to branch to the actual c2i_entry.
983 //
984 // The effect of the extra branch on the i2i and c2i entries is negligible.
985 //
986 // The reason for putting _adapter_trampoline in RO is many shared Methods
987 // share the same AdapterHandlerEntry, so we can save space in the RW section
988 // by having the extra indirection.
989
990
991 [Method A: RW]
992 _constMethod ----> [ConstMethod: RO]
993 _adapter_trampoline -----------+
994 |
995 _i2i_entry (same value as method B) |
996 _from_interpreted_entry (same value as method B) |
997 _from_compiled_entry (same value as method B) |
998 |
999 |
1000 [Method B: RW] +--------+
1001 _constMethod ----> [ConstMethod: RO] |
1002 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+
1003 |
1004 +-------------------------------+
1005 |
1006 +----> [AdapterHandlerEntry] (allocated at run time)
1007 _fingerprint
1008 _c2i_entry ---------------------------------+->[c2i entry..]
1009 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] |
1010 _from_interpreted_entry | _c2i_unverified_entry | |
1011 | | | |
1012 | | (_cds_entry_table: CODE) | |
1013 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | |
1014 | | (allocated at run time) | |
1015 | | ... [asm code ...] | |
1016 +-[not compiled]-+ [n]: jmp _entry_table[n] | |
1017 | | |
1018 | | |
1019 +-[compiled]-------------------------------------------------------------------+ |
1020 |
1021 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) |
1022 [jmp c2i_entry] ------------------------------------------------------+
1023
1024 ***/
1025
1026 // Called when the method_holder is getting linked. Setup entrypoints so the method
1027 // is ready to be called from interpreter, compiler, and vtables.
1028 void Method::link_method(const methodHandle& h_method, TRAPS) {
1029 // If the code cache is full, we may reenter this function for the
1030 // leftover methods that weren't linked.
1031 if (is_shared()) {
1032 address entry = Interpreter::entry_for_cds_method(h_method);
1033 assert(entry != NULL && entry == _i2i_entry,
1034 "should be correctly set during dump time");
1035 if (adapter() != NULL) {
1036 return;
1037 }
1038 assert(entry == _from_interpreted_entry,
1039 "should be correctly set during dump time");
1040 } else if (_i2i_entry != NULL) {
1041 return;
1042 }
1043 assert( _code == NULL, "nothing compiled yet" );
1044
1045 // Setup interpreter entrypoint
1046 assert(this == h_method(), "wrong h_method()" );
1047
1048 if (!is_shared()) {
1049 assert(adapter() == NULL, "init'd to NULL");
1050 address entry = Interpreter::entry_for_method(h_method);
1051 assert(entry != NULL, "interpreter entry must be non-null");
1052 // Sets both _i2i_entry and _from_interpreted_entry
1053 set_interpreter_entry(entry);
1054 }
1055
1056 // Don't overwrite already registered native entries.
1057 if (is_native() && !has_native_function()) {
1058 set_native_function(
1059 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1060 !native_bind_event_is_interesting);
1061 }
1062
1063 // Setup compiler entrypoint. This is made eagerly, so we do not need
1064 // special handling of vtables. An alternative is to make adapters more
1065 // lazily by calling make_adapter() from from_compiled_entry() for the
1066 // normal calls. For vtable calls life gets more complicated. When a
1067 // call-site goes mega-morphic we need adapters in all methods which can be
1068 // called from the vtable. We need adapters on such methods that get loaded
1069 // later. Ditto for mega-morphic itable calls. If this proves to be a
1070 // problem we'll make these lazily later.
1071 (void) make_adapters(h_method, CHECK);
1072
1073 // ONLY USE the h_method now as make_adapter may have blocked
1074
1075 }
1076
1077 address Method::make_adapters(methodHandle mh, TRAPS) {
1078 // Adapters for compiled code are made eagerly here. They are fairly
1079 // small (generally < 100 bytes) and quick to make (and cached and shared)
1080 // so making them eagerly shouldn't be too expensive.
1081 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1082 if (adapter == NULL ) {
1083 if (!is_init_completed()) {
1084 // Don't throw exceptions during VM initialization because java.lang.* classes
1085 // might not have been initialized, causing problems when constructing the
1086 // Java exception object.
1087 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1088 } else {
1089 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1090 }
1091 }
1092
1093 if (mh->is_shared()) {
1094 assert(mh->adapter() == adapter, "must be");
1095 assert(mh->_from_compiled_entry != NULL, "must be");
1096 } else {
1097 mh->set_adapter_entry(adapter);
1098 mh->_from_compiled_entry = adapter->get_c2i_entry();
1099 }
1100 return adapter->get_c2i_entry();
1101 }
1102
1103 void Method::restore_unshareable_info(TRAPS) {
1104 assert(is_method() && is_valid_method(), "ensure C++ vtable is restored");
1105
1106 // Since restore_unshareable_info can be called more than once for a method, don't
1107 // redo any work.
1108 if (adapter() == NULL) {
1109 methodHandle mh(THREAD, this);
1110 link_method(mh, CHECK);
1111 }
1112 }
1113
1114 volatile address Method::from_compiled_entry_no_trampoline() const {
1115 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
1116 if (code) {
1117 return code->verified_entry_point();
1118 } else {
1119 return adapter()->get_c2i_entry();
1120 }
1121 }
1122
1123 // The verified_code_entry() must be called when a invoke is resolved
1124 // on this method.
1125
1126 // It returns the compiled code entry point, after asserting not null.
1127 // This function is called after potential safepoints so that nmethod
1128 // or adapter that it points to is still live and valid.
1129 // This function must not hit a safepoint!
1130 address Method::verified_code_entry() {
1131 debug_only(NoSafepointVerifier nsv;)
1132 assert(_from_compiled_entry != NULL, "must be set");
1133 return _from_compiled_entry;
1134 }
1135
1136 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1137 // (could be racing a deopt).
1138 // Not inline to avoid circular ref.
1139 bool Method::check_code() const {
1140 // cached in a register or local. There's a race on the value of the field.
1141 CompiledMethod *code = (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code);
1142 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1143 }
1144
1145 // Install compiled code. Instantly it can execute.
1146 void Method::set_code(methodHandle mh, CompiledMethod *code) {
1147 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1148 assert( code, "use clear_code to remove code" );
1149 assert( mh->check_code(), "" );
1150
1151 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1152
1153 // These writes must happen in this order, because the interpreter will
1154 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1155 // which jumps to _from_compiled_entry.
1156 mh->_code = code; // Assign before allowing compiled code to exec
1157
1158 int comp_level = code->comp_level();
1159 // In theory there could be a race here. In practice it is unlikely
1160 // and not worth worrying about.
1161 if (comp_level > mh->highest_comp_level()) {
1162 mh->set_highest_comp_level(comp_level);
1163 }
1164
1165 OrderAccess::storestore();
1166 #ifdef SHARK
1167 mh->_from_interpreted_entry = code->insts_begin();
1168 #else //!SHARK
1169 mh->_from_compiled_entry = code->verified_entry_point();
1170 OrderAccess::storestore();
1171 // Instantly compiled code can execute.
1172 if (!mh->is_method_handle_intrinsic())
1173 mh->_from_interpreted_entry = mh->get_i2c_entry();
1174 #endif //!SHARK
1175 }
1176
1177
1178 bool Method::is_overridden_in(Klass* k) const {
1179 InstanceKlass* ik = InstanceKlass::cast(k);
1180
1181 if (ik->is_interface()) return false;
1182
1183 // If method is an interface, we skip it - except if it
1184 // is a miranda method
1185 if (method_holder()->is_interface()) {
1186 // Check that method is not a miranda method
1187 if (ik->lookup_method(name(), signature()) == NULL) {
1188 // No implementation exist - so miranda method
1189 return false;
1190 }
1191 return true;
1192 }
1193
1194 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1195 if (!has_vtable_index()) {
1196 return false;
1197 } else {
1198 Method* vt_m = ik->method_at_vtable(vtable_index());
1199 return vt_m != this;
1200 }
1201 }
1202
1203
1204 // give advice about whether this Method* should be cached or not
1205 bool Method::should_not_be_cached() const {
1206 if (is_old()) {
1207 // This method has been redefined. It is either EMCP or obsolete
1208 // and we don't want to cache it because that would pin the method
1209 // down and prevent it from being collectible if and when it
1210 // finishes executing.
1211 return true;
1212 }
1213
1214 // caching this method should be just fine
1215 return false;
1216 }
1217
1218
1219 /**
1220 * Returns true if this is one of the specially treated methods for
1221 * security related stack walks (like Reflection.getCallerClass).
1222 */
1223 bool Method::is_ignored_by_security_stack_walk() const {
1224 if (intrinsic_id() == vmIntrinsics::_invoke) {
1225 // This is Method.invoke() -- ignore it
1226 return true;
1227 }
1228 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1229 // This is an auxilary frame -- ignore it
1230 return true;
1231 }
1232 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1233 // This is an internal adapter frame for method handles -- ignore it
1234 return true;
1235 }
1236 return false;
1237 }
1238
1239
1240 // Constant pool structure for invoke methods:
1241 enum {
1242 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1243 _imcp_invoke_signature, // utf8: (variable Symbol*)
1244 _imcp_limit
1245 };
1246
1247 // Test if this method is an MH adapter frame generated by Java code.
1248 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1249 bool Method::is_compiled_lambda_form() const {
1250 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1251 }
1252
1253 // Test if this method is an internal MH primitive method.
1254 bool Method::is_method_handle_intrinsic() const {
1255 vmIntrinsics::ID iid = intrinsic_id();
1256 return (MethodHandles::is_signature_polymorphic(iid) &&
1257 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1258 }
1259
1260 bool Method::has_member_arg() const {
1261 vmIntrinsics::ID iid = intrinsic_id();
1262 return (MethodHandles::is_signature_polymorphic(iid) &&
1263 MethodHandles::has_member_arg(iid));
1264 }
1265
1266 // Make an instance of a signature-polymorphic internal MH primitive.
1267 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1268 Symbol* signature,
1269 TRAPS) {
1270 ResourceMark rm;
1271 methodHandle empty;
1272
1273 InstanceKlass* holder = SystemDictionary::MethodHandle_klass();
1274 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1275 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1276 if (TraceMethodHandles) {
1277 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1278 }
1279
1280 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1281 name->increment_refcount();
1282 signature->increment_refcount();
1283
1284 int cp_length = _imcp_limit;
1285 ClassLoaderData* loader_data = holder->class_loader_data();
1286 constantPoolHandle cp;
1287 {
1288 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1289 cp = constantPoolHandle(THREAD, cp_oop);
1290 }
1291 cp->set_pool_holder(holder);
1292 cp->symbol_at_put(_imcp_invoke_name, name);
1293 cp->symbol_at_put(_imcp_invoke_signature, signature);
1294 cp->set_has_preresolution();
1295
1296 // decide on access bits: public or not?
1297 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1298 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1299 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1300 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1301
1302 methodHandle m;
1303 {
1304 InlineTableSizes sizes;
1305 Method* m_oop = Method::allocate(loader_data, 0,
1306 accessFlags_from(flags_bits), &sizes,
1307 ConstMethod::NORMAL, CHECK_(empty));
1308 m = methodHandle(THREAD, m_oop);
1309 }
1310 m->set_constants(cp());
1311 m->set_name_index(_imcp_invoke_name);
1312 m->set_signature_index(_imcp_invoke_signature);
1313 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1314 assert(m->signature() == signature, "");
1315 ResultTypeFinder rtf(signature);
1316 m->constMethod()->set_result_type(rtf.type());
1317 m->compute_size_of_parameters(THREAD);
1318 m->init_intrinsic_id();
1319 assert(m->is_method_handle_intrinsic(), "");
1320 #ifdef ASSERT
1321 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1322 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1323 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1324 #endif //ASSERT
1325
1326 // Finally, set up its entry points.
1327 assert(m->can_be_statically_bound(), "");
1328 m->set_vtable_index(Method::nonvirtual_vtable_index);
1329 m->link_method(m, CHECK_(empty));
1330
1331 if (TraceMethodHandles && (Verbose || WizardMode)) {
1332 ttyLocker ttyl;
1333 m->print_on(tty);
1334 }
1335
1336 return m;
1337 }
1338
1339 Klass* Method::check_non_bcp_klass(Klass* klass) {
1340 if (klass != NULL && klass->class_loader() != NULL) {
1341 if (klass->is_objArray_klass())
1342 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1343 return klass;
1344 }
1345 return NULL;
1346 }
1347
1348
1349 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1350 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1351 // Code below does not work for native methods - they should never get rewritten anyway
1352 assert(!m->is_native(), "cannot rewrite native methods");
1353 // Allocate new Method*
1354 AccessFlags flags = m->access_flags();
1355
1356 ConstMethod* cm = m->constMethod();
1357 int checked_exceptions_len = cm->checked_exceptions_length();
1358 int localvariable_len = cm->localvariable_table_length();
1359 int exception_table_len = cm->exception_table_length();
1360 int method_parameters_len = cm->method_parameters_length();
1361 int method_annotations_len = cm->method_annotations_length();
1362 int parameter_annotations_len = cm->parameter_annotations_length();
1363 int type_annotations_len = cm->type_annotations_length();
1364 int default_annotations_len = cm->default_annotations_length();
1365
1366 InlineTableSizes sizes(
1367 localvariable_len,
1368 new_compressed_linenumber_size,
1369 exception_table_len,
1370 checked_exceptions_len,
1371 method_parameters_len,
1372 cm->generic_signature_index(),
1373 method_annotations_len,
1374 parameter_annotations_len,
1375 type_annotations_len,
1376 default_annotations_len,
1377 0);
1378
1379 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1380 Method* newm_oop = Method::allocate(loader_data,
1381 new_code_length,
1382 flags,
1383 &sizes,
1384 m->method_type(),
1385 CHECK_(methodHandle()));
1386 methodHandle newm (THREAD, newm_oop);
1387
1388 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1389 ConstMethod* newcm = newm->constMethod();
1390 int new_const_method_size = newm->constMethod()->size();
1391
1392 memcpy(newm(), m(), sizeof(Method));
1393
1394 // Create shallow copy of ConstMethod.
1395 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1396
1397 // Reset correct method/const method, method size, and parameter info
1398 newm->set_constMethod(newcm);
1399 newm->constMethod()->set_code_size(new_code_length);
1400 newm->constMethod()->set_constMethod_size(new_const_method_size);
1401 assert(newm->code_size() == new_code_length, "check");
1402 assert(newm->method_parameters_length() == method_parameters_len, "check");
1403 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1404 assert(newm->exception_table_length() == exception_table_len, "check");
1405 assert(newm->localvariable_table_length() == localvariable_len, "check");
1406 // Copy new byte codes
1407 memcpy(newm->code_base(), new_code, new_code_length);
1408 // Copy line number table
1409 if (new_compressed_linenumber_size > 0) {
1410 memcpy(newm->compressed_linenumber_table(),
1411 new_compressed_linenumber_table,
1412 new_compressed_linenumber_size);
1413 }
1414 // Copy method_parameters
1415 if (method_parameters_len > 0) {
1416 memcpy(newm->method_parameters_start(),
1417 m->method_parameters_start(),
1418 method_parameters_len * sizeof(MethodParametersElement));
1419 }
1420 // Copy checked_exceptions
1421 if (checked_exceptions_len > 0) {
1422 memcpy(newm->checked_exceptions_start(),
1423 m->checked_exceptions_start(),
1424 checked_exceptions_len * sizeof(CheckedExceptionElement));
1425 }
1426 // Copy exception table
1427 if (exception_table_len > 0) {
1428 memcpy(newm->exception_table_start(),
1429 m->exception_table_start(),
1430 exception_table_len * sizeof(ExceptionTableElement));
1431 }
1432 // Copy local variable number table
1433 if (localvariable_len > 0) {
1434 memcpy(newm->localvariable_table_start(),
1435 m->localvariable_table_start(),
1436 localvariable_len * sizeof(LocalVariableTableElement));
1437 }
1438 // Copy stackmap table
1439 if (m->has_stackmap_table()) {
1440 int code_attribute_length = m->stackmap_data()->length();
1441 Array<u1>* stackmap_data =
1442 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1443 memcpy((void*)stackmap_data->adr_at(0),
1444 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1445 newm->set_stackmap_data(stackmap_data);
1446 }
1447
1448 // copy annotations over to new method
1449 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL);
1450 return newm;
1451 }
1452
1453 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) {
1454 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1455 // because we are not loading from core libraries
1456 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1457 // which does not use the class default class loader so we check for its loader here
1458 const InstanceKlass* ik = InstanceKlass::cast(holder);
1459 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1460 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1461 }
1462
1463 // see if the klass name is well-known:
1464 Symbol* klass_name = ik->name();
1465 return vmSymbols::find_sid(klass_name);
1466 }
1467
1468 void Method::init_intrinsic_id() {
1469 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1470 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1471 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1472 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1473
1474 // the klass name is well-known:
1475 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1476 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1477
1478 // ditto for method and signature:
1479 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1480 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1481 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1482 && name_id == vmSymbols::NO_SID) {
1483 return;
1484 }
1485 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1486 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1487 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1488 && sig_id == vmSymbols::NO_SID) {
1489 return;
1490 }
1491 jshort flags = access_flags().as_short();
1492
1493 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1494 if (id != vmIntrinsics::_none) {
1495 set_intrinsic_id(id);
1496 if (id == vmIntrinsics::_Class_cast) {
1497 // Even if the intrinsic is rejected, we want to inline this simple method.
1498 set_force_inline(true);
1499 }
1500 return;
1501 }
1502
1503 // A few slightly irregular cases:
1504 switch (klass_id) {
1505 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1506 // Second chance: check in regular Math.
1507 switch (name_id) {
1508 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1509 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1510 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1511 // pretend it is the corresponding method in the non-strict class:
1512 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1513 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1514 break;
1515 }
1516 break;
1517
1518 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1519 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1520 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1521 if (!is_native()) break;
1522 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1523 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1524 id = vmIntrinsics::_none;
1525 break;
1526 }
1527
1528 if (id != vmIntrinsics::_none) {
1529 // Set up its iid. It is an alias method.
1530 set_intrinsic_id(id);
1531 return;
1532 }
1533 }
1534
1535 // These two methods are static since a GC may move the Method
1536 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1537 if (!THREAD->can_call_java()) {
1538 // There is nothing useful this routine can do from within the Compile thread.
1539 // Hopefully, the signature contains only well-known classes.
1540 // We could scan for this and return true/false, but the caller won't care.
1541 return false;
1542 }
1543 bool sig_is_loaded = true;
1544 Handle class_loader(THREAD, m->method_holder()->class_loader());
1545 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1546 ResourceMark rm(THREAD);
1547 Symbol* signature = m->signature();
1548 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1549 if (ss.is_object()) {
1550 Symbol* sym = ss.as_symbol(CHECK_(false));
1551 Symbol* name = sym;
1552 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1553 protection_domain, THREAD);
1554 // We are loading classes eagerly. If a ClassNotFoundException or
1555 // a LinkageError was generated, be sure to ignore it.
1556 if (HAS_PENDING_EXCEPTION) {
1557 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1558 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1559 CLEAR_PENDING_EXCEPTION;
1560 } else {
1561 return false;
1562 }
1563 }
1564 if( klass == NULL) { sig_is_loaded = false; }
1565 }
1566 }
1567 return sig_is_loaded;
1568 }
1569
1570 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1571 Handle class_loader(THREAD, m->method_holder()->class_loader());
1572 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1573 ResourceMark rm(THREAD);
1574 Symbol* signature = m->signature();
1575 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1576 if (ss.type() == T_OBJECT) {
1577 Symbol* name = ss.as_symbol_or_null();
1578 if (name == NULL) return true;
1579 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1580 if (klass == NULL) return true;
1581 }
1582 }
1583 return false;
1584 }
1585
1586 // Exposed so field engineers can debug VM
1587 void Method::print_short_name(outputStream* st) {
1588 ResourceMark rm;
1589 #ifdef PRODUCT
1590 st->print(" %s::", method_holder()->external_name());
1591 #else
1592 st->print(" %s::", method_holder()->internal_name());
1593 #endif
1594 name()->print_symbol_on(st);
1595 if (WizardMode) signature()->print_symbol_on(st);
1596 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1597 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1598 }
1599
1600 // Comparer for sorting an object array containing
1601 // Method*s.
1602 static int method_comparator(Method* a, Method* b) {
1603 return a->name()->fast_compare(b->name());
1604 }
1605
1606 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1607 // default_methods also uses this without the ordering for fast find_method
1608 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1609 int length = methods->length();
1610 if (length > 1) {
1611 {
1612 NoSafepointVerifier nsv;
1613 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1614 }
1615 // Reset method ordering
1616 if (set_idnums) {
1617 for (int i = 0; i < length; i++) {
1618 Method* m = methods->at(i);
1619 m->set_method_idnum(i);
1620 m->set_orig_method_idnum(i);
1621 }
1622 }
1623 }
1624 }
1625
1626 //-----------------------------------------------------------------------------------
1627 // Non-product code unless JVM/TI needs it
1628
1629 #if !defined(PRODUCT) || INCLUDE_JVMTI
1630 class SignatureTypePrinter : public SignatureTypeNames {
1631 private:
1632 outputStream* _st;
1633 bool _use_separator;
1634
1635 void type_name(const char* name) {
1636 if (_use_separator) _st->print(", ");
1637 _st->print("%s", name);
1638 _use_separator = true;
1639 }
1640
1641 public:
1642 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1643 _st = st;
1644 _use_separator = false;
1645 }
1646
1647 void print_parameters() { _use_separator = false; iterate_parameters(); }
1648 void print_returntype() { _use_separator = false; iterate_returntype(); }
1649 };
1650
1651
1652 void Method::print_name(outputStream* st) {
1653 Thread *thread = Thread::current();
1654 ResourceMark rm(thread);
1655 st->print("%s ", is_static() ? "static" : "virtual");
1656 if (WizardMode) {
1657 st->print("%s.", method_holder()->internal_name());
1658 name()->print_symbol_on(st);
1659 signature()->print_symbol_on(st);
1660 } else {
1661 SignatureTypePrinter sig(signature(), st);
1662 sig.print_returntype();
1663 st->print(" %s.", method_holder()->internal_name());
1664 name()->print_symbol_on(st);
1665 st->print("(");
1666 sig.print_parameters();
1667 st->print(")");
1668 }
1669 }
1670 #endif // !PRODUCT || INCLUDE_JVMTI
1671
1672
1673 void Method::print_codes_on(outputStream* st) const {
1674 print_codes_on(0, code_size(), st);
1675 }
1676
1677 void Method::print_codes_on(int from, int to, outputStream* st) const {
1678 Thread *thread = Thread::current();
1679 ResourceMark rm(thread);
1680 methodHandle mh (thread, (Method*)this);
1681 BytecodeStream s(mh);
1682 s.set_interval(from, to);
1683 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1684 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1685 }
1686
1687
1688 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1689 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1690 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1691 // as end-of-stream terminator.
1692
1693 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1694 // bci and line number does not compress into single byte.
1695 // Write out escape character and use regular compression for bci and line number.
1696 write_byte((jubyte)0xFF);
1697 write_signed_int(bci_delta);
1698 write_signed_int(line_delta);
1699 }
1700
1701 // See comment in method.hpp which explains why this exists.
1702 #if defined(_M_AMD64) && _MSC_VER >= 1400
1703 #pragma optimize("", off)
1704 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1705 write_pair_inline(bci, line);
1706 }
1707 #pragma optimize("", on)
1708 #endif
1709
1710 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1711 _bci = 0;
1712 _line = 0;
1713 };
1714
1715
1716 bool CompressedLineNumberReadStream::read_pair() {
1717 jubyte next = read_byte();
1718 // Check for terminator
1719 if (next == 0) return false;
1720 if (next == 0xFF) {
1721 // Escape character, regular compression used
1722 _bci += read_signed_int();
1723 _line += read_signed_int();
1724 } else {
1725 // Single byte compression used
1726 _bci += next >> 3;
1727 _line += next & 0x7;
1728 }
1729 return true;
1730 }
1731
1732 #if INCLUDE_JVMTI
1733
1734 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1735 BreakpointInfo* bp = method_holder()->breakpoints();
1736 for (; bp != NULL; bp = bp->next()) {
1737 if (bp->match(this, bci)) {
1738 return bp->orig_bytecode();
1739 }
1740 }
1741 {
1742 ResourceMark rm;
1743 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1744 }
1745 return Bytecodes::_shouldnotreachhere;
1746 }
1747
1748 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1749 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1750 BreakpointInfo* bp = method_holder()->breakpoints();
1751 for (; bp != NULL; bp = bp->next()) {
1752 if (bp->match(this, bci)) {
1753 bp->set_orig_bytecode(code);
1754 // and continue, in case there is more than one
1755 }
1756 }
1757 }
1758
1759 void Method::set_breakpoint(int bci) {
1760 InstanceKlass* ik = method_holder();
1761 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1762 bp->set_next(ik->breakpoints());
1763 ik->set_breakpoints(bp);
1764 // do this last:
1765 bp->set(this);
1766 }
1767
1768 static void clear_matches(Method* m, int bci) {
1769 InstanceKlass* ik = m->method_holder();
1770 BreakpointInfo* prev_bp = NULL;
1771 BreakpointInfo* next_bp;
1772 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1773 next_bp = bp->next();
1774 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1775 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1776 // do this first:
1777 bp->clear(m);
1778 // unhook it
1779 if (prev_bp != NULL)
1780 prev_bp->set_next(next_bp);
1781 else
1782 ik->set_breakpoints(next_bp);
1783 delete bp;
1784 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1785 // at same location. So we have multiple matching (method_index and bci)
1786 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1787 // breakpoint for clear_breakpoint request and keep all other method versions
1788 // BreakpointInfo for future clear_breakpoint request.
1789 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1790 // which is being called when class is unloaded. We delete all the Breakpoint
1791 // information for all versions of method. We may not correctly restore the original
1792 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1793 // so these methods won't be used anymore.
1794 if (bci >= 0) {
1795 break;
1796 }
1797 } else {
1798 // This one is a keeper.
1799 prev_bp = bp;
1800 }
1801 }
1802 }
1803
1804 void Method::clear_breakpoint(int bci) {
1805 assert(bci >= 0, "");
1806 clear_matches(this, bci);
1807 }
1808
1809 void Method::clear_all_breakpoints() {
1810 clear_matches(this, -1);
1811 }
1812
1813 #endif // INCLUDE_JVMTI
1814
1815 int Method::invocation_count() {
1816 MethodCounters *mcs = method_counters();
1817 if (TieredCompilation) {
1818 MethodData* const mdo = method_data();
1819 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1820 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1821 return InvocationCounter::count_limit;
1822 } else {
1823 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1824 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1825 }
1826 } else {
1827 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1828 }
1829 }
1830
1831 int Method::backedge_count() {
1832 MethodCounters *mcs = method_counters();
1833 if (TieredCompilation) {
1834 MethodData* const mdo = method_data();
1835 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1836 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1837 return InvocationCounter::count_limit;
1838 } else {
1839 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1840 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1841 }
1842 } else {
1843 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1844 }
1845 }
1846
1847 int Method::highest_comp_level() const {
1848 const MethodCounters* mcs = method_counters();
1849 if (mcs != NULL) {
1850 return mcs->highest_comp_level();
1851 } else {
1852 return CompLevel_none;
1853 }
1854 }
1855
1856 int Method::highest_osr_comp_level() const {
1857 const MethodCounters* mcs = method_counters();
1858 if (mcs != NULL) {
1859 return mcs->highest_osr_comp_level();
1860 } else {
1861 return CompLevel_none;
1862 }
1863 }
1864
1865 void Method::set_highest_comp_level(int level) {
1866 MethodCounters* mcs = method_counters();
1867 if (mcs != NULL) {
1868 mcs->set_highest_comp_level(level);
1869 }
1870 }
1871
1872 void Method::set_highest_osr_comp_level(int level) {
1873 MethodCounters* mcs = method_counters();
1874 if (mcs != NULL) {
1875 mcs->set_highest_osr_comp_level(level);
1876 }
1877 }
1878
1879 #if INCLUDE_JVMTI
1880
1881 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1882 _bci = bci;
1883 _name_index = m->name_index();
1884 _signature_index = m->signature_index();
1885 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1886 if (_orig_bytecode == Bytecodes::_breakpoint)
1887 _orig_bytecode = m->orig_bytecode_at(_bci);
1888 _next = NULL;
1889 }
1890
1891 void BreakpointInfo::set(Method* method) {
1892 #ifdef ASSERT
1893 {
1894 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1895 if (code == Bytecodes::_breakpoint)
1896 code = method->orig_bytecode_at(_bci);
1897 assert(orig_bytecode() == code, "original bytecode must be the same");
1898 }
1899 #endif
1900 Thread *thread = Thread::current();
1901 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1902 method->incr_number_of_breakpoints(thread);
1903 SystemDictionary::notice_modification();
1904 {
1905 // Deoptimize all dependents on this method
1906 HandleMark hm(thread);
1907 methodHandle mh(thread, method);
1908 CodeCache::flush_dependents_on_method(mh);
1909 }
1910 }
1911
1912 void BreakpointInfo::clear(Method* method) {
1913 *method->bcp_from(_bci) = orig_bytecode();
1914 assert(method->number_of_breakpoints() > 0, "must not go negative");
1915 method->decr_number_of_breakpoints(Thread::current());
1916 }
1917
1918 #endif // INCLUDE_JVMTI
1919
1920 // jmethodID handling
1921
1922 // This is a block allocating object, sort of like JNIHandleBlock, only a
1923 // lot simpler.
1924 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1925 // never get rid of it.
1926
1927 static const int min_block_size = 8;
1928
1929 class JNIMethodBlockNode : public CHeapObj<mtClass> {
1930 friend class JNIMethodBlock;
1931 Method** _methods;
1932 int _number_of_methods;
1933 int _top;
1934 JNIMethodBlockNode* _next;
1935
1936 public:
1937
1938 JNIMethodBlockNode(int num_methods = min_block_size);
1939
1940 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
1941
1942 void ensure_methods(int num_addl_methods) {
1943 if (_top < _number_of_methods) {
1944 num_addl_methods -= _number_of_methods - _top;
1945 if (num_addl_methods <= 0) {
1946 return;
1947 }
1948 }
1949 if (_next == NULL) {
1950 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
1951 } else {
1952 _next->ensure_methods(num_addl_methods);
1953 }
1954 }
1955 };
1956
1957 class JNIMethodBlock : public CHeapObj<mtClass> {
1958 JNIMethodBlockNode _head;
1959 JNIMethodBlockNode *_last_free;
1960 public:
1961 static Method* const _free_method;
1962
1963 JNIMethodBlock(int initial_capacity = min_block_size)
1964 : _head(initial_capacity), _last_free(&_head) {}
1965
1966 void ensure_methods(int num_addl_methods) {
1967 _last_free->ensure_methods(num_addl_methods);
1968 }
1969
1970 Method** add_method(Method* m) {
1971 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) {
1972 if (b->_top < b->_number_of_methods) {
1973 // top points to the next free entry.
1974 int i = b->_top;
1975 b->_methods[i] = m;
1976 b->_top++;
1977 _last_free = b;
1978 return &(b->_methods[i]);
1979 } else if (b->_top == b->_number_of_methods) {
1980 // if the next free entry ran off the block see if there's a free entry
1981 for (int i = 0; i < b->_number_of_methods; i++) {
1982 if (b->_methods[i] == _free_method) {
1983 b->_methods[i] = m;
1984 _last_free = b;
1985 return &(b->_methods[i]);
1986 }
1987 }
1988 // Only check each block once for frees. They're very unlikely.
1989 // Increment top past the end of the block.
1990 b->_top++;
1991 }
1992 // need to allocate a next block.
1993 if (b->_next == NULL) {
1994 b->_next = _last_free = new JNIMethodBlockNode();
1995 }
1996 }
1997 guarantee(false, "Should always allocate a free block");
1998 return NULL;
1999 }
2000
2001 bool contains(Method** m) {
2002 if (m == NULL) return false;
2003 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2004 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2005 // This is a bit of extra checking, for two reasons. One is
2006 // that contains() deals with pointers that are passed in by
2007 // JNI code, so making sure that the pointer is aligned
2008 // correctly is valuable. The other is that <= and > are
2009 // technically not defined on pointers, so the if guard can
2010 // pass spuriously; no modern compiler is likely to make that
2011 // a problem, though (and if one did, the guard could also
2012 // fail spuriously, which would be bad).
2013 ptrdiff_t idx = m - b->_methods;
2014 if (b->_methods + idx == m) {
2015 return true;
2016 }
2017 }
2018 }
2019 return false; // not found
2020 }
2021
2022 // Doesn't really destroy it, just marks it as free so it can be reused.
2023 void destroy_method(Method** m) {
2024 #ifdef ASSERT
2025 assert(contains(m), "should be a methodID");
2026 #endif // ASSERT
2027 *m = _free_method;
2028 }
2029
2030 // During class unloading the methods are cleared, which is different
2031 // than freed.
2032 void clear_all_methods() {
2033 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2034 for (int i = 0; i< b->_number_of_methods; i++) {
2035 b->_methods[i] = NULL;
2036 }
2037 }
2038 }
2039 #ifndef PRODUCT
2040 int count_methods() {
2041 // count all allocated methods
2042 int count = 0;
2043 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2044 for (int i = 0; i< b->_number_of_methods; i++) {
2045 if (b->_methods[i] != _free_method) count++;
2046 }
2047 }
2048 return count;
2049 }
2050 #endif // PRODUCT
2051 };
2052
2053 // Something that can't be mistaken for an address or a markOop
2054 Method* const JNIMethodBlock::_free_method = (Method*)55;
2055
2056 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) {
2057 _number_of_methods = MAX2(num_methods, min_block_size);
2058 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2059 for (int i = 0; i < _number_of_methods; i++) {
2060 _methods[i] = JNIMethodBlock::_free_method;
2061 }
2062 }
2063
2064 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
2065 ClassLoaderData* cld = loader_data;
2066 if (!SafepointSynchronize::is_at_safepoint()) {
2067 // Have to add jmethod_ids() to class loader data thread-safely.
2068 // Also have to add the method to the list safely, which the cld lock
2069 // protects as well.
2070 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2071 if (cld->jmethod_ids() == NULL) {
2072 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2073 } else {
2074 cld->jmethod_ids()->ensure_methods(capacity);
2075 }
2076 } else {
2077 // At safepoint, we are single threaded and can set this.
2078 if (cld->jmethod_ids() == NULL) {
2079 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2080 } else {
2081 cld->jmethod_ids()->ensure_methods(capacity);
2082 }
2083 }
2084 }
2085
2086 // Add a method id to the jmethod_ids
2087 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
2088 ClassLoaderData* cld = loader_data;
2089
2090 if (!SafepointSynchronize::is_at_safepoint()) {
2091 // Have to add jmethod_ids() to class loader data thread-safely.
2092 // Also have to add the method to the list safely, which the cld lock
2093 // protects as well.
2094 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2095 if (cld->jmethod_ids() == NULL) {
2096 cld->set_jmethod_ids(new JNIMethodBlock());
2097 }
2098 // jmethodID is a pointer to Method*
2099 return (jmethodID)cld->jmethod_ids()->add_method(m);
2100 } else {
2101 // At safepoint, we are single threaded and can set this.
2102 if (cld->jmethod_ids() == NULL) {
2103 cld->set_jmethod_ids(new JNIMethodBlock());
2104 }
2105 // jmethodID is a pointer to Method*
2106 return (jmethodID)cld->jmethod_ids()->add_method(m);
2107 }
2108 }
2109
2110 // Mark a jmethodID as free. This is called when there is a data race in
2111 // InstanceKlass while creating the jmethodID cache.
2112 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
2113 ClassLoaderData* cld = loader_data;
2114 Method** ptr = (Method**)m;
2115 assert(cld->jmethod_ids() != NULL, "should have method handles");
2116 cld->jmethod_ids()->destroy_method(ptr);
2117 }
2118
2119 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2120 // Can't assert the method_holder is the same because the new method has the
2121 // scratch method holder.
2122 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2123 == new_method->method_holder()->class_loader(),
2124 "changing to a different class loader");
2125 // Just change the method in place, jmethodID pointer doesn't change.
2126 *((Method**)jmid) = new_method;
2127 }
2128
2129 bool Method::is_method_id(jmethodID mid) {
2130 Method* m = resolve_jmethod_id(mid);
2131 assert(m != NULL, "should be called with non-null method");
2132 InstanceKlass* ik = m->method_holder();
2133 ClassLoaderData* cld = ik->class_loader_data();
2134 if (cld->jmethod_ids() == NULL) return false;
2135 return (cld->jmethod_ids()->contains((Method**)mid));
2136 }
2137
2138 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2139 if (mid == NULL) return NULL;
2140 Method* o = resolve_jmethod_id(mid);
2141 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
2142 return NULL;
2143 }
2144 return o;
2145 };
2146
2147 void Method::set_on_stack(const bool value) {
2148 // Set both the method itself and its constant pool. The constant pool
2149 // on stack means some method referring to it is also on the stack.
2150 constants()->set_on_stack(value);
2151
2152 bool already_set = on_stack();
2153 _access_flags.set_on_stack(value);
2154 if (value && !already_set) {
2155 MetadataOnStackMark::record(this);
2156 }
2157 }
2158
2159 // Called when the class loader is unloaded to make all methods weak.
2160 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2161 loader_data->jmethod_ids()->clear_all_methods();
2162 }
2163
2164 bool Method::has_method_vptr(const void* ptr) {
2165 Method m;
2166 // This assumes that the vtbl pointer is the first word of a C++ object.
2167 return dereference_vptr(&m) == dereference_vptr(ptr);
2168 }
2169
2170 // Check that this pointer is valid by checking that the vtbl pointer matches
2171 bool Method::is_valid_method() const {
2172 if (this == NULL) {
2173 return false;
2174 } else if ((intptr_t(this) & (wordSize-1)) != 0) {
2175 // Quick sanity check on pointer.
2176 return false;
2177 } else if (MetaspaceShared::is_in_shared_space(this)) {
2178 return MetaspaceShared::is_valid_shared_method(this);
2179 } else if (Metaspace::contains_non_shared(this)) {
2180 return has_method_vptr((const void*)this);
2181 } else {
2182 return false;
2183 }
2184 }
2185
2186 #ifndef PRODUCT
2187 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
2188 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
2189 }
2190 #endif // PRODUCT
2191
2192
2193 // Printing
2194
2195 #ifndef PRODUCT
2196
2197 void Method::print_on(outputStream* st) const {
2198 ResourceMark rm;
2199 assert(is_method(), "must be method");
2200 st->print_cr("%s", internal_name());
2201 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this));
2202 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2203 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants()));
2204 constants()->print_value_on(st); st->cr();
2205 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2206 st->print (" - name: "); name()->print_value_on(st); st->cr();
2207 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2208 st->print_cr(" - max stack: %d", max_stack());
2209 st->print_cr(" - max locals: %d", max_locals());
2210 st->print_cr(" - size of params: %d", size_of_parameters());
2211 st->print_cr(" - method size: %d", method_size());
2212 if (intrinsic_id() != vmIntrinsics::_none)
2213 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
2214 if (highest_comp_level() != CompLevel_none)
2215 st->print_cr(" - highest level: %d", highest_comp_level());
2216 st->print_cr(" - vtable index: %d", _vtable_index);
2217 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry()));
2218 st->print( " - adapters: ");
2219 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2220 if (a == NULL)
2221 st->print_cr(INTPTR_FORMAT, p2i(a));
2222 else
2223 a->print_adapter_on(st);
2224 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry()));
2225 st->print_cr(" - code size: %d", code_size());
2226 if (code_size() != 0) {
2227 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base()));
2228 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size()));
2229 }
2230 if (method_data() != NULL) {
2231 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data()));
2232 }
2233 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2234 if (checked_exceptions_length() > 0) {
2235 CheckedExceptionElement* table = checked_exceptions_start();
2236 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table));
2237 if (Verbose) {
2238 for (int i = 0; i < checked_exceptions_length(); i++) {
2239 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2240 }
2241 }
2242 }
2243 if (has_linenumber_table()) {
2244 u_char* table = compressed_linenumber_table();
2245 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table));
2246 if (Verbose) {
2247 CompressedLineNumberReadStream stream(table);
2248 while (stream.read_pair()) {
2249 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2250 }
2251 }
2252 }
2253 st->print_cr(" - localvar length: %d", localvariable_table_length());
2254 if (localvariable_table_length() > 0) {
2255 LocalVariableTableElement* table = localvariable_table_start();
2256 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table));
2257 if (Verbose) {
2258 for (int i = 0; i < localvariable_table_length(); i++) {
2259 int bci = table[i].start_bci;
2260 int len = table[i].length;
2261 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2262 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2263 int slot = table[i].slot;
2264 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2265 }
2266 }
2267 }
2268 if (code() != NULL) {
2269 st->print (" - compiled code: ");
2270 code()->print_value_on(st);
2271 }
2272 if (is_native()) {
2273 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function()));
2274 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler()));
2275 }
2276 }
2277
2278 void Method::print_linkage_flags(outputStream* st) {
2279 access_flags().print_on(st);
2280 if (is_default_method()) {
2281 st->print("default ");
2282 }
2283 if (is_overpass()) {
2284 st->print("overpass ");
2285 }
2286 }
2287 #endif //PRODUCT
2288
2289 void Method::print_value_on(outputStream* st) const {
2290 assert(is_method(), "must be method");
2291 st->print("%s", internal_name());
2292 print_address_on(st);
2293 st->print(" ");
2294 name()->print_value_on(st);
2295 st->print(" ");
2296 signature()->print_value_on(st);
2297 st->print(" in ");
2298 method_holder()->print_value_on(st);
2299 if (WizardMode) st->print("#%d", _vtable_index);
2300 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2301 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2302 }
2303
2304 #if INCLUDE_SERVICES
2305 // Size Statistics
2306 void Method::collect_statistics(KlassSizeStats *sz) const {
2307 int mysize = sz->count(this);
2308 sz->_method_bytes += mysize;
2309 sz->_method_all_bytes += mysize;
2310 sz->_rw_bytes += mysize;
2311
2312 if (constMethod()) {
2313 constMethod()->collect_statistics(sz);
2314 }
2315 if (method_data()) {
2316 method_data()->collect_statistics(sz);
2317 }
2318 }
2319 #endif // INCLUDE_SERVICES
2320
2321 // LogTouchedMethods and PrintTouchedMethods
2322
2323 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because
2324 // the Method may be garbage collected. Let's roll our own hash table.
2325 class TouchedMethodRecord : CHeapObj<mtTracing> {
2326 public:
2327 // It's OK to store Symbols here because they will NOT be GC'ed if
2328 // LogTouchedMethods is enabled.
2329 TouchedMethodRecord* _next;
2330 Symbol* _class_name;
2331 Symbol* _method_name;
2332 Symbol* _method_signature;
2333 };
2334
2335 static const int TOUCHED_METHOD_TABLE_SIZE = 20011;
2336 static TouchedMethodRecord** _touched_method_table = NULL;
2337
2338 void Method::log_touched(TRAPS) {
2339
2340 const int table_size = TOUCHED_METHOD_TABLE_SIZE;
2341 Symbol* my_class = klass_name();
2342 Symbol* my_name = name();
2343 Symbol* my_sig = signature();
2344
2345 unsigned int hash = my_class->identity_hash() +
2346 my_name->identity_hash() +
2347 my_sig->identity_hash();
2348 juint index = juint(hash) % table_size;
2349
2350 MutexLocker ml(TouchedMethodLog_lock, THREAD);
2351 if (_touched_method_table == NULL) {
2352 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size,
2353 mtTracing, CURRENT_PC);
2354 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size);
2355 }
2356
2357 TouchedMethodRecord* ptr = _touched_method_table[index];
2358 while (ptr) {
2359 if (ptr->_class_name == my_class &&
2360 ptr->_method_name == my_name &&
2361 ptr->_method_signature == my_sig) {
2362 return;
2363 }
2364 if (ptr->_next == NULL) break;
2365 ptr = ptr->_next;
2366 }
2367 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing);
2368 my_class->set_permanent(); // prevent reclaimed by GC
2369 my_name->set_permanent();
2370 my_sig->set_permanent();
2371 nptr->_class_name = my_class;
2372 nptr->_method_name = my_name;
2373 nptr->_method_signature = my_sig;
2374 nptr->_next = NULL;
2375
2376 if (ptr == NULL) {
2377 // first
2378 _touched_method_table[index] = nptr;
2379 } else {
2380 ptr->_next = nptr;
2381 }
2382 }
2383
2384 void Method::print_touched_methods(outputStream* out) {
2385 MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock);
2386 out->print_cr("# Method::print_touched_methods version 1");
2387 if (_touched_method_table) {
2388 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) {
2389 TouchedMethodRecord* ptr = _touched_method_table[i];
2390 while(ptr) {
2391 ptr->_class_name->print_symbol_on(out); out->print(".");
2392 ptr->_method_name->print_symbol_on(out); out->print(":");
2393 ptr->_method_signature->print_symbol_on(out); out->cr();
2394 ptr = ptr->_next;
2395 }
2396 }
2397 }
2398 }
2399
2400 // Verification
2401
2402 void Method::verify_on(outputStream* st) {
2403 guarantee(is_method(), "object must be method");
2404 guarantee(constants()->is_constantPool(), "should be constant pool");
2405 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2406 MethodData* md = method_data();
2407 guarantee(md == NULL ||
2408 md->is_methodData(), "should be method data");
2409 }