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/xmlstream.hpp"
63
64 // Implementation of Method
65
66 Method* Method::allocate(ClassLoaderData* loader_data,
67 int byte_code_size,
68 AccessFlags access_flags,
69 InlineTableSizes* sizes,
70 ConstMethod::MethodType method_type,
71 TRAPS) {
72 assert(!access_flags.is_native() || byte_code_size == 0,
73 "native methods should not contain byte codes");
74 ConstMethod* cm = ConstMethod::allocate(loader_data,
75 byte_code_size,
76 sizes,
77 method_type,
78 CHECK_NULL);
79 int size = Method::size(access_flags.is_native());
80 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags);
81 }
82
83 Method::Method(ConstMethod* xconst, AccessFlags access_flags) {
84 NoSafepointVerifier no_safepoint;
85 set_constMethod(xconst);
86 set_access_flags(access_flags);
87 set_intrinsic_id(vmIntrinsics::_none);
88 set_jfr_towrite(false);
89 set_force_inline(false);
90 set_hidden(false);
91 set_dont_inline(false);
92 set_has_injected_profile(false);
93 set_method_data(NULL);
94 clear_method_counters();
95 set_vtable_index(Method::garbage_vtable_index);
96
97 // Fix and bury in Method*
98 set_interpreter_entry(NULL); // sets i2i entry and from_int
99 set_adapter_entry(NULL);
100 clear_code(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, KlassHandle ex_klass, int throw_bci, TRAPS) {
178 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
179 // access exception table
180 ExceptionTable table(mh());
181 int length = table.length();
182 // iterate through all entries sequentially
183 constantPoolHandle pool(THREAD, mh->constants());
184 for (int i = 0; i < length; i ++) {
185 //reacquire the table in case a GC happened
186 ExceptionTable table(mh());
187 int beg_bci = table.start_pc(i);
188 int end_bci = table.end_pc(i);
189 assert(beg_bci <= end_bci, "inconsistent exception table");
190 if (beg_bci <= throw_bci && throw_bci < end_bci) {
191 // exception handler bci range covers throw_bci => investigate further
192 int handler_bci = table.handler_pc(i);
193 int klass_index = table.catch_type_index(i);
194 if (klass_index == 0) {
195 return handler_bci;
196 } else if (ex_klass.is_null()) {
197 return handler_bci;
198 } else {
199 // we know the exception class => get the constraint class
200 // this may require loading of the constraint class; if verification
201 // fails or some other exception occurs, return handler_bci
202 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
203 KlassHandle klass = KlassHandle(THREAD, k);
204 assert(klass.not_null(), "klass not loaded");
205 if (ex_klass->is_subtype_of(klass())) {
206 return handler_bci;
207 }
208 }
209 }
210 }
211
212 return -1;
213 }
214
215 void Method::mask_for(int bci, InterpreterOopMap* mask) {
216
217 Thread* myThread = Thread::current();
218 methodHandle h_this(myThread, this);
219 #if defined(ASSERT) && !INCLUDE_JVMCI
220 bool has_capability = myThread->is_VM_thread() ||
221 myThread->is_ConcurrentGC_thread() ||
222 myThread->is_GC_task_thread();
223
224 if (!has_capability) {
225 if (!VerifyStack && !VerifyLastFrame) {
226 // verify stack calls this outside VM thread
227 warning("oopmap should only be accessed by the "
228 "VM, GC task or CMS threads (or during debugging)");
229 InterpreterOopMap local_mask;
230 method_holder()->mask_for(h_this, bci, &local_mask);
231 local_mask.print();
232 }
233 }
234 #endif
235 method_holder()->mask_for(h_this, bci, mask);
236 return;
237 }
238
239
240 int Method::bci_from(address bcp) const {
241 if (is_native() && bcp == 0) {
242 return 0;
243 }
244 #ifdef ASSERT
245 {
246 ResourceMark rm;
247 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
248 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s",
249 p2i(bcp), name_and_sig_as_C_string());
250 }
251 #endif
252 return bcp - code_base();
253 }
254
255
256 int Method::validate_bci(int bci) const {
257 return (bci == 0 || bci < code_size()) ? bci : -1;
258 }
259
260 // Return bci if it appears to be a valid bcp
261 // Return -1 otherwise.
262 // Used by profiling code, when invalid data is a possibility.
263 // The caller is responsible for validating the Method* itself.
264 int Method::validate_bci_from_bcp(address bcp) const {
265 // keep bci as -1 if not a valid bci
266 int bci = -1;
267 if (bcp == 0 || bcp == code_base()) {
268 // code_size() may return 0 and we allow 0 here
269 // the method may be native
270 bci = 0;
271 } else if (contains(bcp)) {
272 bci = bcp - code_base();
273 }
274 // Assert that if we have dodged any asserts, bci is negative.
275 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
276 return bci;
277 }
278
279 address Method::bcp_from(int bci) const {
280 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
281 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
282 address bcp = code_base() + bci;
283 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
284 return bcp;
285 }
286
287 address Method::bcp_from(address bcp) const {
288 if (is_native() && bcp == NULL) {
289 return code_base();
290 } else {
291 return bcp;
292 }
293 }
294
295 int Method::size(bool is_native) {
296 // If native, then include pointers for native_function and signature_handler
297 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
298 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
299 return align_metadata_size(header_size() + extra_words);
300 }
301
302
303 Symbol* Method::klass_name() const {
304 return method_holder()->name();
305 }
306
307
308 // Attempt to return method oop to original state. Clear any pointers
309 // (to objects outside the shared spaces). We won't be able to predict
310 // where they should point in a new JVM. Further initialize some
311 // entries now in order allow them to be write protected later.
312
313 void Method::remove_unshareable_info() {
314 unlink_method();
315 }
316
317 void Method::set_vtable_index(int index) {
318 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
319 // At runtime initialize_vtable is rerun as part of link_class_impl()
320 // for a shared class loaded by the non-boot loader to obtain the loader
321 // constraints based on the runtime classloaders' context.
322 return; // don't write into the shared class
323 } else {
324 _vtable_index = index;
325 }
326 }
327
328 void Method::set_itable_index(int index) {
329 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
330 // At runtime initialize_itable is rerun as part of link_class_impl()
331 // for a shared class loaded by the non-boot loader to obtain the loader
332 // constraints based on the runtime classloaders' context. The dumptime
333 // itable index should be the same as the runtime index.
334 assert(_vtable_index == itable_index_max - index,
335 "archived itable index is different from runtime index");
336 return; // don’t write into the shared class
337 } else {
338 _vtable_index = itable_index_max - index;
339 }
340 assert(valid_itable_index(), "");
341 }
342
343
344
345 bool Method::was_executed_more_than(int n) {
346 // Invocation counter is reset when the Method* is compiled.
347 // If the method has compiled code we therefore assume it has
348 // be excuted more than n times.
349 if (is_accessor() || is_empty_method() || (code() != NULL)) {
350 // interpreter doesn't bump invocation counter of trivial methods
351 // compiler does not bump invocation counter of compiled methods
352 return true;
353 }
354 else if ((method_counters() != NULL &&
355 method_counters()->invocation_counter()->carry()) ||
356 (method_data() != NULL &&
357 method_data()->invocation_counter()->carry())) {
358 // The carry bit is set when the counter overflows and causes
359 // a compilation to occur. We don't know how many times
360 // the counter has been reset, so we simply assume it has
361 // been executed more than n times.
362 return true;
363 } else {
364 return invocation_count() > n;
365 }
366 }
367
368 void Method::print_invocation_count() {
369 if (is_static()) tty->print("static ");
370 if (is_final()) tty->print("final ");
371 if (is_synchronized()) tty->print("synchronized ");
372 if (is_native()) tty->print("native ");
373 tty->print("%s::", method_holder()->external_name());
374 name()->print_symbol_on(tty);
375 signature()->print_symbol_on(tty);
376
377 if (WizardMode) {
378 // dump the size of the byte codes
379 tty->print(" {%d}", code_size());
380 }
381 tty->cr();
382
383 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
384 tty->print_cr (" invocation_counter: %8d ", invocation_count());
385 tty->print_cr (" backedge_counter: %8d ", backedge_count());
386 #ifndef PRODUCT
387 if (CountCompiledCalls) {
388 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
389 }
390 #endif
391 }
392
393 // Build a MethodData* object to hold information about this method
394 // collected in the interpreter.
395 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) {
396 // Do not profile the method if metaspace has hit an OOM previously
397 // allocating profiling data. Callers clear pending exception so don't
398 // add one here.
399 if (ClassLoaderDataGraph::has_metaspace_oom()) {
400 return;
401 }
402
403 // Grab a lock here to prevent multiple
404 // MethodData*s from being created.
405 MutexLocker ml(MethodData_lock, THREAD);
406 if (method->method_data() == NULL) {
407 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
408 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
409 if (HAS_PENDING_EXCEPTION) {
410 CompileBroker::log_metaspace_failure();
411 ClassLoaderDataGraph::set_metaspace_oom(true);
412 return; // return the exception (which is cleared)
413 }
414
415 method->set_method_data(method_data);
416 if (PrintMethodData && (Verbose || WizardMode)) {
417 ResourceMark rm(THREAD);
418 tty->print("build_interpreter_method_data for ");
419 method->print_name(tty);
420 tty->cr();
421 // At the end of the run, the MDO, full of data, will be dumped.
422 }
423 }
424 }
425
426 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
427 // Do not profile the method if metaspace has hit an OOM previously
428 if (ClassLoaderDataGraph::has_metaspace_oom()) {
429 return NULL;
430 }
431
432 methodHandle mh(m);
433 MethodCounters* counters = MethodCounters::allocate(mh, THREAD);
434 if (HAS_PENDING_EXCEPTION) {
435 CompileBroker::log_metaspace_failure();
436 ClassLoaderDataGraph::set_metaspace_oom(true);
437 return NULL; // return the exception (which is cleared)
438 }
439 if (!mh->init_method_counters(counters)) {
440 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
441 }
442
443 if (LogTouchedMethods) {
444 mh->log_touched(CHECK_NULL);
445 }
446
447 return mh->method_counters();
448 }
449
450 void Method::cleanup_inline_caches() {
451 // The current system doesn't use inline caches in the interpreter
452 // => nothing to do (keep this method around for future use)
453 }
454
455
456 int Method::extra_stack_words() {
457 // not an inline function, to avoid a header dependency on Interpreter
458 return extra_stack_entries() * Interpreter::stackElementSize;
459 }
460
461
462 void Method::compute_size_of_parameters(Thread *thread) {
463 ArgumentSizeComputer asc(signature());
464 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
465 }
466
467 BasicType Method::result_type() const {
468 ResultTypeFinder rtf(signature());
469 return rtf.type();
470 }
471
472
473 bool Method::is_empty_method() const {
474 return code_size() == 1
475 && *code_base() == Bytecodes::_return;
476 }
477
478
479 bool Method::is_vanilla_constructor() const {
480 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
481 // which only calls the superclass vanilla constructor and possibly does stores of
482 // zero constants to local fields:
483 //
484 // aload_0
485 // invokespecial
486 // indexbyte1
487 // indexbyte2
488 //
489 // followed by an (optional) sequence of:
490 //
491 // aload_0
492 // aconst_null / iconst_0 / fconst_0 / dconst_0
493 // putfield
494 // indexbyte1
495 // indexbyte2
496 //
497 // followed by:
498 //
499 // return
500
501 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
502 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
503 int size = code_size();
504 // Check if size match
505 if (size == 0 || size % 5 != 0) return false;
506 address cb = code_base();
507 int last = size - 1;
508 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
509 // Does not call superclass default constructor
510 return false;
511 }
512 // Check optional sequence
513 for (int i = 4; i < last; i += 5) {
514 if (cb[i] != Bytecodes::_aload_0) return false;
515 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
516 if (cb[i+2] != Bytecodes::_putfield) return false;
517 }
518 return true;
519 }
520
521
522 bool Method::compute_has_loops_flag() {
523 BytecodeStream bcs(this);
524 Bytecodes::Code bc;
525
526 while ((bc = bcs.next()) >= 0) {
527 switch( bc ) {
528 case Bytecodes::_ifeq:
529 case Bytecodes::_ifnull:
530 case Bytecodes::_iflt:
531 case Bytecodes::_ifle:
532 case Bytecodes::_ifne:
533 case Bytecodes::_ifnonnull:
534 case Bytecodes::_ifgt:
535 case Bytecodes::_ifge:
536 case Bytecodes::_if_icmpeq:
537 case Bytecodes::_if_icmpne:
538 case Bytecodes::_if_icmplt:
539 case Bytecodes::_if_icmpgt:
540 case Bytecodes::_if_icmple:
541 case Bytecodes::_if_icmpge:
542 case Bytecodes::_if_acmpeq:
543 case Bytecodes::_if_acmpne:
544 case Bytecodes::_goto:
545 case Bytecodes::_jsr:
546 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
547 break;
548
549 case Bytecodes::_goto_w:
550 case Bytecodes::_jsr_w:
551 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
552 break;
553 }
554 }
555 _access_flags.set_loops_flag_init();
556 return _access_flags.has_loops();
557 }
558
559 bool Method::is_final_method(AccessFlags class_access_flags) const {
560 // or "does_not_require_vtable_entry"
561 // default method or overpass can occur, is not final (reuses vtable entry)
562 // private methods in classes get vtable entries for backward class compatibility.
563 if (is_overpass() || is_default_method()) return false;
564 return is_final() || class_access_flags.is_final();
565 }
566
567 bool Method::is_final_method() const {
568 return is_final_method(method_holder()->access_flags());
569 }
570
571 bool Method::is_default_method() const {
572 if (method_holder() != NULL &&
573 method_holder()->is_interface() &&
574 !is_abstract() && !is_private()) {
575 return true;
576 } else {
577 return false;
578 }
579 }
580
581 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
582 if (is_final_method(class_access_flags)) return true;
583 #ifdef ASSERT
584 ResourceMark rm;
585 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
586 if (class_access_flags.is_interface()) {
587 assert(is_nonv == is_static() || is_nonv == is_private(),
588 "nonvirtual unexpected for non-static, non-private: %s",
589 name_and_sig_as_C_string());
590 }
591 #endif
592 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
593 return vtable_index() == nonvirtual_vtable_index;
594 }
595
596 bool Method::can_be_statically_bound() const {
597 return can_be_statically_bound(method_holder()->access_flags());
598 }
599
600 bool Method::is_accessor() const {
601 return is_getter() || is_setter();
602 }
603
604 bool Method::is_getter() const {
605 if (code_size() != 5) return false;
606 if (size_of_parameters() != 1) return false;
607 if (java_code_at(0) != Bytecodes::_aload_0) return false;
608 if (java_code_at(1) != Bytecodes::_getfield) return false;
609 switch (java_code_at(4)) {
610 case Bytecodes::_ireturn:
611 case Bytecodes::_lreturn:
612 case Bytecodes::_freturn:
613 case Bytecodes::_dreturn:
614 case Bytecodes::_areturn:
615 break;
616 default:
617 return false;
618 }
619 return true;
620 }
621
622 bool Method::is_setter() const {
623 if (code_size() != 6) return false;
624 if (java_code_at(0) != Bytecodes::_aload_0) return false;
625 switch (java_code_at(1)) {
626 case Bytecodes::_iload_1:
627 case Bytecodes::_aload_1:
628 case Bytecodes::_fload_1:
629 if (size_of_parameters() != 2) return false;
630 break;
631 case Bytecodes::_dload_1:
632 case Bytecodes::_lload_1:
633 if (size_of_parameters() != 3) return false;
634 break;
635 default:
636 return false;
637 }
638 if (java_code_at(2) != Bytecodes::_putfield) return false;
639 if (java_code_at(5) != Bytecodes::_return) return false;
640 return true;
641 }
642
643 bool Method::is_constant_getter() const {
644 int last_index = code_size() - 1;
645 // Check if the first 1-3 bytecodes are a constant push
646 // and the last bytecode is a return.
647 return (2 <= code_size() && code_size() <= 4 &&
648 Bytecodes::is_const(java_code_at(0)) &&
649 Bytecodes::length_for(java_code_at(0)) == last_index &&
650 Bytecodes::is_return(java_code_at(last_index)));
651 }
652
653 bool Method::is_initializer() const {
654 return is_object_initializer() || is_static_initializer();
655 }
656
657 bool Method::has_valid_initializer_flags() const {
658 return (is_static() ||
659 method_holder()->major_version() < 51);
660 }
661
662 bool Method::is_static_initializer() const {
663 // For classfiles version 51 or greater, ensure that the clinit method is
664 // static. Non-static methods with the name "<clinit>" are not static
665 // initializers. (older classfiles exempted for backward compatibility)
666 return name() == vmSymbols::class_initializer_name() &&
667 has_valid_initializer_flags();
668 }
669
670 bool Method::is_object_initializer() const {
671 return name() == vmSymbols::object_initializer_name();
672 }
673
674 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
675 int length = method->checked_exceptions_length();
676 if (length == 0) { // common case
677 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
678 } else {
679 methodHandle h_this(THREAD, method);
680 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
681 objArrayHandle mirrors (THREAD, m_oop);
682 for (int i = 0; i < length; i++) {
683 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
684 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
685 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
686 mirrors->obj_at_put(i, k->java_mirror());
687 }
688 return mirrors;
689 }
690 };
691
692
693 int Method::line_number_from_bci(int bci) const {
694 if (bci == SynchronizationEntryBCI) bci = 0;
695 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
696 int best_bci = 0;
697 int best_line = -1;
698
699 if (has_linenumber_table()) {
700 // The line numbers are a short array of 2-tuples [start_pc, line_number].
701 // Not necessarily sorted and not necessarily one-to-one.
702 CompressedLineNumberReadStream stream(compressed_linenumber_table());
703 while (stream.read_pair()) {
704 if (stream.bci() == bci) {
705 // perfect match
706 return stream.line();
707 } else {
708 // update best_bci/line
709 if (stream.bci() < bci && stream.bci() >= best_bci) {
710 best_bci = stream.bci();
711 best_line = stream.line();
712 }
713 }
714 }
715 }
716 return best_line;
717 }
718
719
720 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
721 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
722 Thread *thread = Thread::current();
723 Symbol* klass_name = constants()->klass_name_at(klass_index);
724 Handle loader(thread, method_holder()->class_loader());
725 Handle prot (thread, method_holder()->protection_domain());
726 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
727 } else {
728 return true;
729 }
730 }
731
732
733 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
734 int klass_index = constants()->klass_ref_index_at(refinfo_index);
735 if (must_be_resolved) {
736 // Make sure klass is resolved in constantpool.
737 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
738 }
739 return is_klass_loaded_by_klass_index(klass_index);
740 }
741
742
743 void Method::set_native_function(address function, bool post_event_flag) {
744 assert(function != NULL, "use clear_native_function to unregister natives");
745 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
746 address* native_function = native_function_addr();
747
748 // We can see racers trying to place the same native function into place. Once
749 // is plenty.
750 address current = *native_function;
751 if (current == function) return;
752 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
753 function != NULL) {
754 // native_method_throw_unsatisfied_link_error_entry() should only
755 // be passed when post_event_flag is false.
756 assert(function !=
757 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
758 "post_event_flag mis-match");
759
760 // post the bind event, and possible change the bind function
761 JvmtiExport::post_native_method_bind(this, &function);
762 }
763 *native_function = function;
764 // This function can be called more than once. We must make sure that we always
765 // use the latest registered method -> check if a stub already has been generated.
766 // If so, we have to make it not_entrant.
767 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
768 if (nm != NULL) {
769 nm->make_not_entrant();
770 }
771 }
772
773
774 bool Method::has_native_function() const {
775 if (is_method_handle_intrinsic())
776 return false; // special-cased in SharedRuntime::generate_native_wrapper
777 address func = native_function();
778 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
779 }
780
781
782 void Method::clear_native_function() {
783 // Note: is_method_handle_intrinsic() is allowed here.
784 set_native_function(
785 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
786 !native_bind_event_is_interesting);
787 clear_code();
788 }
789
790 address Method::critical_native_function() {
791 methodHandle mh(this);
792 return NativeLookup::lookup_critical_entry(mh);
793 }
794
795
796 void Method::set_signature_handler(address handler) {
797 address* signature_handler = signature_handler_addr();
798 *signature_handler = handler;
799 }
800
801
802 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
803 if (PrintCompilation && report) {
804 ttyLocker ttyl;
805 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
806 if (comp_level == CompLevel_all) {
807 tty->print("all levels ");
808 } else {
809 tty->print("levels ");
810 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
811 tty->print("%d ", i);
812 }
813 }
814 this->print_short_name(tty);
815 int size = this->code_size();
816 if (size > 0) {
817 tty->print(" (%d bytes)", size);
818 }
819 if (reason != NULL) {
820 tty->print(" %s", reason);
821 }
822 tty->cr();
823 }
824 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
825 ttyLocker ttyl;
826 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
827 os::current_thread_id(), is_osr, comp_level);
828 if (reason != NULL) {
829 xtty->print(" reason=\'%s\'", reason);
830 }
831 xtty->method(this);
832 xtty->stamp();
833 xtty->end_elem();
834 }
835 }
836
837 bool Method::is_always_compilable() const {
838 // Generated adapters must be compiled
839 if (is_method_handle_intrinsic() && is_synthetic()) {
840 assert(!is_not_c1_compilable(), "sanity check");
841 assert(!is_not_c2_compilable(), "sanity check");
842 return true;
843 }
844
845 return false;
846 }
847
848 bool Method::is_not_compilable(int comp_level) const {
849 if (number_of_breakpoints() > 0)
850 return true;
851 if (is_always_compilable())
852 return false;
853 if (comp_level == CompLevel_any)
854 return is_not_c1_compilable() || is_not_c2_compilable();
855 if (is_c1_compile(comp_level))
856 return is_not_c1_compilable();
857 if (is_c2_compile(comp_level))
858 return is_not_c2_compilable();
859 return false;
860 }
861
862 // call this when compiler finds that this method is not compilable
863 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
864 if (is_always_compilable()) {
865 // Don't mark a method which should be always compilable
866 return;
867 }
868 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
869 if (comp_level == CompLevel_all) {
870 set_not_c1_compilable();
871 set_not_c2_compilable();
872 } else {
873 if (is_c1_compile(comp_level))
874 set_not_c1_compilable();
875 if (is_c2_compile(comp_level))
876 set_not_c2_compilable();
877 }
878 CompilationPolicy::policy()->disable_compilation(this);
879 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
880 }
881
882 bool Method::is_not_osr_compilable(int comp_level) const {
883 if (is_not_compilable(comp_level))
884 return true;
885 if (comp_level == CompLevel_any)
886 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
887 if (is_c1_compile(comp_level))
888 return is_not_c1_osr_compilable();
889 if (is_c2_compile(comp_level))
890 return is_not_c2_osr_compilable();
891 return false;
892 }
893
894 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
895 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
896 if (comp_level == CompLevel_all) {
897 set_not_c1_osr_compilable();
898 set_not_c2_osr_compilable();
899 } else {
900 if (is_c1_compile(comp_level))
901 set_not_c1_osr_compilable();
902 if (is_c2_compile(comp_level))
903 set_not_c2_osr_compilable();
904 }
905 CompilationPolicy::policy()->disable_compilation(this);
906 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
907 }
908
909 // Revert to using the interpreter and clear out the nmethod
910 void Method::clear_code(bool acquire_lock /* = true */) {
911 MutexLockerEx pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag);
912 // this may be NULL if c2i adapters have not been made yet
913 // Only should happen at allocate time.
914 if (adapter() == NULL) {
915 _from_compiled_entry = NULL;
916 } else {
917 _from_compiled_entry = adapter()->get_c2i_entry();
918 }
919 OrderAccess::storestore();
920 _from_interpreted_entry = _i2i_entry;
921 OrderAccess::storestore();
922 _code = NULL;
923 }
924
925 #if INCLUDE_CDS
926 // Called by class data sharing to remove any entry points (which are not shared)
927 void Method::unlink_method() {
928 _code = NULL;
929
930 assert(DumpSharedSpaces, "dump time only");
931 // Set the values to what they should be at run time. Note that
932 // this Method can no longer be executed during dump time.
933 _i2i_entry = Interpreter::entry_for_cds_method(this);
934 _from_interpreted_entry = _i2i_entry;
935
936 if (is_native()) {
937 *native_function_addr() = NULL;
938 set_signature_handler(NULL);
939 }
940 NOT_PRODUCT(set_compiled_invocation_count(0);)
941
942 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter();
943 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline());
944 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline();
945 assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time");
946
947
948 // In case of DumpSharedSpaces, _method_data should always be NULL.
949 assert(_method_data == NULL, "unexpected method data?");
950
951 set_method_data(NULL);
952 clear_method_counters();
953 }
954 #endif
955
956 /****************************************************************************
957 // The following illustrates how the entries work for CDS shared Methods:
958 //
959 // Our goal is to delay writing into a shared Method until it's compiled.
960 // Hence, we want to determine the initial values for _i2i_entry,
961 // _from_interpreted_entry and _from_compiled_entry during CDS dump time.
962 //
963 // In this example, both Methods A and B have the _i2i_entry of "zero_locals".
964 // They also have similar signatures so that they will share the same
965 // AdapterHandlerEntry.
966 //
967 // _adapter_trampoline points to a fixed location in the RW section of
968 // the CDS archive. This location initially contains a NULL pointer. When the
969 // first of method A or B is linked, an AdapterHandlerEntry is allocated
970 // dynamically, and its c2i/i2c entries are generated.
971 //
972 // _i2i_entry and _from_interpreted_entry initially points to the same
973 // (fixed) location in the CODE section of the CDS archive. This contains
974 // an unconditional branch to the actual entry for "zero_locals", which is
975 // generated at run time and may be on an arbitrary address. Thus, the
976 // unconditional branch is also generated at run time to jump to the correct
977 // address.
978 //
979 // Similarly, _from_compiled_entry points to a fixed address in the CODE
980 // section. This address has enough space for an unconditional branch
981 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is
982 // initialized, and the address for the actual c2i_entry is known, we emit a
983 // branch instruction here to branch to the actual c2i_entry.
984 //
985 // The effect of the extra branch on the i2i and c2i entries is negligible.
986 //
987 // The reason for putting _adapter_trampoline in RO is many shared Methods
988 // share the same AdapterHandlerEntry, so we can save space in the RW section
989 // by having the extra indirection.
990
991
992 [Method A: RW]
993 _constMethod ----> [ConstMethod: RO]
994 _adapter_trampoline -----------+
995 |
996 _i2i_entry (same value as method B) |
997 _from_interpreted_entry (same value as method B) |
998 _from_compiled_entry (same value as method B) |
999 |
1000 |
1001 [Method B: RW] +--------+
1002 _constMethod ----> [ConstMethod: RO] |
1003 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+
1004 |
1005 +-------------------------------+
1006 |
1007 +----> [AdapterHandlerEntry] (allocated at run time)
1008 _fingerprint
1009 _c2i_entry ---------------------------------+->[c2i entry..]
1010 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] |
1011 _from_interpreted_entry | _c2i_unverified_entry | |
1012 | | | |
1013 | | (_cds_entry_table: CODE) | |
1014 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | |
1015 | | (allocated at run time) | |
1016 | | ... [asm code ...] | |
1017 +-[not compiled]-+ [n]: jmp _entry_table[n] | |
1018 | | |
1019 | | |
1020 +-[compiled]-------------------------------------------------------------------+ |
1021 |
1022 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) |
1023 [jmp c2i_entry] ------------------------------------------------------+
1024
1025 ***/
1026
1027 // Called when the method_holder is getting linked. Setup entrypoints so the method
1028 // is ready to be called from interpreter, compiler, and vtables.
1029 void Method::link_method(const methodHandle& h_method, TRAPS) {
1030 // If the code cache is full, we may reenter this function for the
1031 // leftover methods that weren't linked.
1032 if (is_shared()) {
1033 address entry = Interpreter::entry_for_cds_method(h_method);
1034 assert(entry != NULL && entry == _i2i_entry,
1035 "should be correctly set during dump time");
1036 if (adapter() != NULL) {
1037 return;
1038 }
1039 assert(entry == _from_interpreted_entry,
1040 "should be correctly set during dump time");
1041 } else if (_i2i_entry != NULL) {
1042 return;
1043 }
1044 assert( _code == NULL, "nothing compiled yet" );
1045
1046 // Setup interpreter entrypoint
1047 assert(this == h_method(), "wrong h_method()" );
1048
1049 if (!is_shared()) {
1050 assert(adapter() == NULL, "init'd to NULL");
1051 address entry = Interpreter::entry_for_method(h_method);
1052 assert(entry != NULL, "interpreter entry must be non-null");
1053 // Sets both _i2i_entry and _from_interpreted_entry
1054 set_interpreter_entry(entry);
1055 }
1056
1057 // Don't overwrite already registered native entries.
1058 if (is_native() && !has_native_function()) {
1059 set_native_function(
1060 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1061 !native_bind_event_is_interesting);
1062 }
1063
1064 // Setup compiler entrypoint. This is made eagerly, so we do not need
1065 // special handling of vtables. An alternative is to make adapters more
1066 // lazily by calling make_adapter() from from_compiled_entry() for the
1067 // normal calls. For vtable calls life gets more complicated. When a
1068 // call-site goes mega-morphic we need adapters in all methods which can be
1069 // called from the vtable. We need adapters on such methods that get loaded
1070 // later. Ditto for mega-morphic itable calls. If this proves to be a
1071 // problem we'll make these lazily later.
1072 (void) make_adapters(h_method, CHECK);
1073
1074 // ONLY USE the h_method now as make_adapter may have blocked
1075
1076 }
1077
1078 address Method::make_adapters(methodHandle mh, TRAPS) {
1079 // Adapters for compiled code are made eagerly here. They are fairly
1080 // small (generally < 100 bytes) and quick to make (and cached and shared)
1081 // so making them eagerly shouldn't be too expensive.
1082 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1083 if (adapter == NULL ) {
1084 if (!is_init_completed()) {
1085 // Don't throw exceptions during VM initialization because java.lang.* classes
1086 // might not have been initialized, causing problems when constructing the
1087 // Java exception object.
1088 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1089 } else {
1090 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1091 }
1092 }
1093
1094 if (mh->is_shared()) {
1095 assert(mh->adapter() == adapter, "must be");
1096 assert(mh->_from_compiled_entry != NULL, "must be");
1097 } else {
1098 mh->set_adapter_entry(adapter);
1099 mh->_from_compiled_entry = adapter->get_c2i_entry();
1100 }
1101 return adapter->get_c2i_entry();
1102 }
1103
1104 void Method::restore_unshareable_info(TRAPS) {
1105 // Since restore_unshareable_info can be called more than once for a method, don't
1106 // redo any work.
1107 if (adapter() == NULL) {
1108 // Restore Method's C++ vtable by calling a virtual function
1109 restore_vtable();
1110
1111 methodHandle mh(THREAD, this);
1112 link_method(mh, CHECK);
1113 }
1114 }
1115
1116 volatile address Method::from_compiled_entry_no_trampoline() const {
1117 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
1118 if (code) {
1119 return code->verified_entry_point();
1120 } else {
1121 return adapter()->get_c2i_entry();
1122 }
1123 }
1124
1125 // The verified_code_entry() must be called when a invoke is resolved
1126 // on this method.
1127
1128 // It returns the compiled code entry point, after asserting not null.
1129 // This function is called after potential safepoints so that nmethod
1130 // or adapter that it points to is still live and valid.
1131 // This function must not hit a safepoint!
1132 address Method::verified_code_entry() {
1133 debug_only(NoSafepointVerifier nsv;)
1134 assert(_from_compiled_entry != NULL, "must be set");
1135 return _from_compiled_entry;
1136 }
1137
1138 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1139 // (could be racing a deopt).
1140 // Not inline to avoid circular ref.
1141 bool Method::check_code() const {
1142 // cached in a register or local. There's a race on the value of the field.
1143 CompiledMethod *code = (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code);
1144 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1145 }
1146
1147 // Install compiled code. Instantly it can execute.
1148 void Method::set_code(methodHandle mh, CompiledMethod *code) {
1149 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1150 assert( code, "use clear_code to remove code" );
1151 assert( mh->check_code(), "" );
1152
1153 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1154
1155 // These writes must happen in this order, because the interpreter will
1156 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1157 // which jumps to _from_compiled_entry.
1158 mh->_code = code; // Assign before allowing compiled code to exec
1159
1160 int comp_level = code->comp_level();
1161 // In theory there could be a race here. In practice it is unlikely
1162 // and not worth worrying about.
1163 if (comp_level > mh->highest_comp_level()) {
1164 mh->set_highest_comp_level(comp_level);
1165 }
1166
1167 OrderAccess::storestore();
1168 #ifdef SHARK
1169 mh->_from_interpreted_entry = code->insts_begin();
1170 #else //!SHARK
1171 mh->_from_compiled_entry = code->verified_entry_point();
1172 OrderAccess::storestore();
1173 // Instantly compiled code can execute.
1174 if (!mh->is_method_handle_intrinsic())
1175 mh->_from_interpreted_entry = mh->get_i2c_entry();
1176 #endif //!SHARK
1177 }
1178
1179
1180 bool Method::is_overridden_in(Klass* k) const {
1181 InstanceKlass* ik = InstanceKlass::cast(k);
1182
1183 if (ik->is_interface()) return false;
1184
1185 // If method is an interface, we skip it - except if it
1186 // is a miranda method
1187 if (method_holder()->is_interface()) {
1188 // Check that method is not a miranda method
1189 if (ik->lookup_method(name(), signature()) == NULL) {
1190 // No implementation exist - so miranda method
1191 return false;
1192 }
1193 return true;
1194 }
1195
1196 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1197 assert(ik->vtable() != NULL, "vtable should exist");
1198 if (!has_vtable_index()) {
1199 return false;
1200 } else {
1201 Method* vt_m = ik->method_at_vtable(vtable_index());
1202 return vt_m != this;
1203 }
1204 }
1205
1206
1207 // give advice about whether this Method* should be cached or not
1208 bool Method::should_not_be_cached() const {
1209 if (is_old()) {
1210 // This method has been redefined. It is either EMCP or obsolete
1211 // and we don't want to cache it because that would pin the method
1212 // down and prevent it from being collectible if and when it
1213 // finishes executing.
1214 return true;
1215 }
1216
1217 // caching this method should be just fine
1218 return false;
1219 }
1220
1221
1222 /**
1223 * Returns true if this is one of the specially treated methods for
1224 * security related stack walks (like Reflection.getCallerClass).
1225 */
1226 bool Method::is_ignored_by_security_stack_walk() const {
1227 if (intrinsic_id() == vmIntrinsics::_invoke) {
1228 // This is Method.invoke() -- ignore it
1229 return true;
1230 }
1231 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1232 // This is an auxilary frame -- ignore it
1233 return true;
1234 }
1235 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1236 // This is an internal adapter frame for method handles -- ignore it
1237 return true;
1238 }
1239 return false;
1240 }
1241
1242
1243 // Constant pool structure for invoke methods:
1244 enum {
1245 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1246 _imcp_invoke_signature, // utf8: (variable Symbol*)
1247 _imcp_limit
1248 };
1249
1250 // Test if this method is an MH adapter frame generated by Java code.
1251 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1252 bool Method::is_compiled_lambda_form() const {
1253 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1254 }
1255
1256 // Test if this method is an internal MH primitive method.
1257 bool Method::is_method_handle_intrinsic() const {
1258 vmIntrinsics::ID iid = intrinsic_id();
1259 return (MethodHandles::is_signature_polymorphic(iid) &&
1260 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1261 }
1262
1263 bool Method::has_member_arg() const {
1264 vmIntrinsics::ID iid = intrinsic_id();
1265 return (MethodHandles::is_signature_polymorphic(iid) &&
1266 MethodHandles::has_member_arg(iid));
1267 }
1268
1269 // Make an instance of a signature-polymorphic internal MH primitive.
1270 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1271 Symbol* signature,
1272 TRAPS) {
1273 ResourceMark rm;
1274 methodHandle empty;
1275
1276 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1277 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1278 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1279 if (TraceMethodHandles) {
1280 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1281 }
1282
1283 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1284 name->increment_refcount();
1285 signature->increment_refcount();
1286
1287 int cp_length = _imcp_limit;
1288 ClassLoaderData* loader_data = holder->class_loader_data();
1289 constantPoolHandle cp;
1290 {
1291 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1292 cp = constantPoolHandle(THREAD, cp_oop);
1293 }
1294 cp->set_pool_holder(InstanceKlass::cast(holder()));
1295 cp->symbol_at_put(_imcp_invoke_name, name);
1296 cp->symbol_at_put(_imcp_invoke_signature, signature);
1297 cp->set_has_preresolution();
1298
1299 // decide on access bits: public or not?
1300 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1301 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1302 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1303 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1304
1305 methodHandle m;
1306 {
1307 InlineTableSizes sizes;
1308 Method* m_oop = Method::allocate(loader_data, 0,
1309 accessFlags_from(flags_bits), &sizes,
1310 ConstMethod::NORMAL, CHECK_(empty));
1311 m = methodHandle(THREAD, m_oop);
1312 }
1313 m->set_constants(cp());
1314 m->set_name_index(_imcp_invoke_name);
1315 m->set_signature_index(_imcp_invoke_signature);
1316 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1317 assert(m->signature() == signature, "");
1318 ResultTypeFinder rtf(signature);
1319 m->constMethod()->set_result_type(rtf.type());
1320 m->compute_size_of_parameters(THREAD);
1321 m->init_intrinsic_id();
1322 assert(m->is_method_handle_intrinsic(), "");
1323 #ifdef ASSERT
1324 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1325 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1326 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1327 #endif //ASSERT
1328
1329 // Finally, set up its entry points.
1330 assert(m->can_be_statically_bound(), "");
1331 m->set_vtable_index(Method::nonvirtual_vtable_index);
1332 m->link_method(m, CHECK_(empty));
1333
1334 if (TraceMethodHandles && (Verbose || WizardMode)) {
1335 ttyLocker ttyl;
1336 m->print_on(tty);
1337 }
1338
1339 return m;
1340 }
1341
1342 Klass* Method::check_non_bcp_klass(Klass* klass) {
1343 if (klass != NULL && klass->class_loader() != NULL) {
1344 if (klass->is_objArray_klass())
1345 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1346 return klass;
1347 }
1348 return NULL;
1349 }
1350
1351
1352 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1353 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1354 // Code below does not work for native methods - they should never get rewritten anyway
1355 assert(!m->is_native(), "cannot rewrite native methods");
1356 // Allocate new Method*
1357 AccessFlags flags = m->access_flags();
1358
1359 ConstMethod* cm = m->constMethod();
1360 int checked_exceptions_len = cm->checked_exceptions_length();
1361 int localvariable_len = cm->localvariable_table_length();
1362 int exception_table_len = cm->exception_table_length();
1363 int method_parameters_len = cm->method_parameters_length();
1364 int method_annotations_len = cm->method_annotations_length();
1365 int parameter_annotations_len = cm->parameter_annotations_length();
1366 int type_annotations_len = cm->type_annotations_length();
1367 int default_annotations_len = cm->default_annotations_length();
1368
1369 InlineTableSizes sizes(
1370 localvariable_len,
1371 new_compressed_linenumber_size,
1372 exception_table_len,
1373 checked_exceptions_len,
1374 method_parameters_len,
1375 cm->generic_signature_index(),
1376 method_annotations_len,
1377 parameter_annotations_len,
1378 type_annotations_len,
1379 default_annotations_len,
1380 0);
1381
1382 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1383 Method* newm_oop = Method::allocate(loader_data,
1384 new_code_length,
1385 flags,
1386 &sizes,
1387 m->method_type(),
1388 CHECK_(methodHandle()));
1389 methodHandle newm (THREAD, newm_oop);
1390
1391 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1392 ConstMethod* newcm = newm->constMethod();
1393 int new_const_method_size = newm->constMethod()->size();
1394
1395 memcpy(newm(), m(), sizeof(Method));
1396
1397 // Create shallow copy of ConstMethod.
1398 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1399
1400 // Reset correct method/const method, method size, and parameter info
1401 newm->set_constMethod(newcm);
1402 newm->constMethod()->set_code_size(new_code_length);
1403 newm->constMethod()->set_constMethod_size(new_const_method_size);
1404 assert(newm->code_size() == new_code_length, "check");
1405 assert(newm->method_parameters_length() == method_parameters_len, "check");
1406 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1407 assert(newm->exception_table_length() == exception_table_len, "check");
1408 assert(newm->localvariable_table_length() == localvariable_len, "check");
1409 // Copy new byte codes
1410 memcpy(newm->code_base(), new_code, new_code_length);
1411 // Copy line number table
1412 if (new_compressed_linenumber_size > 0) {
1413 memcpy(newm->compressed_linenumber_table(),
1414 new_compressed_linenumber_table,
1415 new_compressed_linenumber_size);
1416 }
1417 // Copy method_parameters
1418 if (method_parameters_len > 0) {
1419 memcpy(newm->method_parameters_start(),
1420 m->method_parameters_start(),
1421 method_parameters_len * sizeof(MethodParametersElement));
1422 }
1423 // Copy checked_exceptions
1424 if (checked_exceptions_len > 0) {
1425 memcpy(newm->checked_exceptions_start(),
1426 m->checked_exceptions_start(),
1427 checked_exceptions_len * sizeof(CheckedExceptionElement));
1428 }
1429 // Copy exception table
1430 if (exception_table_len > 0) {
1431 memcpy(newm->exception_table_start(),
1432 m->exception_table_start(),
1433 exception_table_len * sizeof(ExceptionTableElement));
1434 }
1435 // Copy local variable number table
1436 if (localvariable_len > 0) {
1437 memcpy(newm->localvariable_table_start(),
1438 m->localvariable_table_start(),
1439 localvariable_len * sizeof(LocalVariableTableElement));
1440 }
1441 // Copy stackmap table
1442 if (m->has_stackmap_table()) {
1443 int code_attribute_length = m->stackmap_data()->length();
1444 Array<u1>* stackmap_data =
1445 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1446 memcpy((void*)stackmap_data->adr_at(0),
1447 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1448 newm->set_stackmap_data(stackmap_data);
1449 }
1450
1451 // copy annotations over to new method
1452 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL);
1453 return newm;
1454 }
1455
1456 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) {
1457 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1458 // because we are not loading from core libraries
1459 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1460 // which does not use the class default class loader so we check for its loader here
1461 const InstanceKlass* ik = InstanceKlass::cast(holder);
1462 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1463 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1464 }
1465
1466 // see if the klass name is well-known:
1467 Symbol* klass_name = ik->name();
1468 return vmSymbols::find_sid(klass_name);
1469 }
1470
1471 void Method::init_intrinsic_id() {
1472 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1473 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1474 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1475 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1476
1477 // the klass name is well-known:
1478 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1479 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1480
1481 // ditto for method and signature:
1482 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1483 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1484 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1485 && name_id == vmSymbols::NO_SID) {
1486 return;
1487 }
1488 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1489 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1490 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1491 && sig_id == vmSymbols::NO_SID) {
1492 return;
1493 }
1494 jshort flags = access_flags().as_short();
1495
1496 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1497 if (id != vmIntrinsics::_none) {
1498 set_intrinsic_id(id);
1499 if (id == vmIntrinsics::_Class_cast) {
1500 // Even if the intrinsic is rejected, we want to inline this simple method.
1501 set_force_inline(true);
1502 }
1503 return;
1504 }
1505
1506 // A few slightly irregular cases:
1507 switch (klass_id) {
1508 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1509 // Second chance: check in regular Math.
1510 switch (name_id) {
1511 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1512 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1513 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1514 // pretend it is the corresponding method in the non-strict class:
1515 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1516 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1517 break;
1518 }
1519 break;
1520
1521 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1522 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1523 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1524 if (!is_native()) break;
1525 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1526 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1527 id = vmIntrinsics::_none;
1528 break;
1529 }
1530
1531 if (id != vmIntrinsics::_none) {
1532 // Set up its iid. It is an alias method.
1533 set_intrinsic_id(id);
1534 return;
1535 }
1536 }
1537
1538 // These two methods are static since a GC may move the Method
1539 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1540 if (!THREAD->can_call_java()) {
1541 // There is nothing useful this routine can do from within the Compile thread.
1542 // Hopefully, the signature contains only well-known classes.
1543 // We could scan for this and return true/false, but the caller won't care.
1544 return false;
1545 }
1546 bool sig_is_loaded = true;
1547 Handle class_loader(THREAD, m->method_holder()->class_loader());
1548 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1549 ResourceMark rm(THREAD);
1550 Symbol* signature = m->signature();
1551 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1552 if (ss.is_object()) {
1553 Symbol* sym = ss.as_symbol(CHECK_(false));
1554 Symbol* name = sym;
1555 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1556 protection_domain, THREAD);
1557 // We are loading classes eagerly. If a ClassNotFoundException or
1558 // a LinkageError was generated, be sure to ignore it.
1559 if (HAS_PENDING_EXCEPTION) {
1560 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1561 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1562 CLEAR_PENDING_EXCEPTION;
1563 } else {
1564 return false;
1565 }
1566 }
1567 if( klass == NULL) { sig_is_loaded = false; }
1568 }
1569 }
1570 return sig_is_loaded;
1571 }
1572
1573 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1574 Handle class_loader(THREAD, m->method_holder()->class_loader());
1575 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1576 ResourceMark rm(THREAD);
1577 Symbol* signature = m->signature();
1578 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1579 if (ss.type() == T_OBJECT) {
1580 Symbol* name = ss.as_symbol_or_null();
1581 if (name == NULL) return true;
1582 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1583 if (klass == NULL) return true;
1584 }
1585 }
1586 return false;
1587 }
1588
1589 // Exposed so field engineers can debug VM
1590 void Method::print_short_name(outputStream* st) {
1591 ResourceMark rm;
1592 #ifdef PRODUCT
1593 st->print(" %s::", method_holder()->external_name());
1594 #else
1595 st->print(" %s::", method_holder()->internal_name());
1596 #endif
1597 name()->print_symbol_on(st);
1598 if (WizardMode) signature()->print_symbol_on(st);
1599 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1600 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1601 }
1602
1603 // Comparer for sorting an object array containing
1604 // Method*s.
1605 static int method_comparator(Method* a, Method* b) {
1606 return a->name()->fast_compare(b->name());
1607 }
1608
1609 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1610 // default_methods also uses this without the ordering for fast find_method
1611 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1612 int length = methods->length();
1613 if (length > 1) {
1614 {
1615 NoSafepointVerifier nsv;
1616 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1617 }
1618 // Reset method ordering
1619 if (set_idnums) {
1620 for (int i = 0; i < length; i++) {
1621 Method* m = methods->at(i);
1622 m->set_method_idnum(i);
1623 m->set_orig_method_idnum(i);
1624 }
1625 }
1626 }
1627 }
1628
1629 //-----------------------------------------------------------------------------------
1630 // Non-product code unless JVM/TI needs it
1631
1632 #if !defined(PRODUCT) || INCLUDE_JVMTI
1633 class SignatureTypePrinter : public SignatureTypeNames {
1634 private:
1635 outputStream* _st;
1636 bool _use_separator;
1637
1638 void type_name(const char* name) {
1639 if (_use_separator) _st->print(", ");
1640 _st->print("%s", name);
1641 _use_separator = true;
1642 }
1643
1644 public:
1645 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1646 _st = st;
1647 _use_separator = false;
1648 }
1649
1650 void print_parameters() { _use_separator = false; iterate_parameters(); }
1651 void print_returntype() { _use_separator = false; iterate_returntype(); }
1652 };
1653
1654
1655 void Method::print_name(outputStream* st) {
1656 Thread *thread = Thread::current();
1657 ResourceMark rm(thread);
1658 st->print("%s ", is_static() ? "static" : "virtual");
1659 if (WizardMode) {
1660 st->print("%s.", method_holder()->internal_name());
1661 name()->print_symbol_on(st);
1662 signature()->print_symbol_on(st);
1663 } else {
1664 SignatureTypePrinter sig(signature(), st);
1665 sig.print_returntype();
1666 st->print(" %s.", method_holder()->internal_name());
1667 name()->print_symbol_on(st);
1668 st->print("(");
1669 sig.print_parameters();
1670 st->print(")");
1671 }
1672 }
1673 #endif // !PRODUCT || INCLUDE_JVMTI
1674
1675
1676 void Method::print_codes_on(outputStream* st) const {
1677 print_codes_on(0, code_size(), st);
1678 }
1679
1680 void Method::print_codes_on(int from, int to, outputStream* st) const {
1681 Thread *thread = Thread::current();
1682 ResourceMark rm(thread);
1683 methodHandle mh (thread, (Method*)this);
1684 BytecodeStream s(mh);
1685 s.set_interval(from, to);
1686 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1687 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1688 }
1689
1690
1691 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1692 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1693 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1694 // as end-of-stream terminator.
1695
1696 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1697 // bci and line number does not compress into single byte.
1698 // Write out escape character and use regular compression for bci and line number.
1699 write_byte((jubyte)0xFF);
1700 write_signed_int(bci_delta);
1701 write_signed_int(line_delta);
1702 }
1703
1704 // See comment in method.hpp which explains why this exists.
1705 #if defined(_M_AMD64) && _MSC_VER >= 1400
1706 #pragma optimize("", off)
1707 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1708 write_pair_inline(bci, line);
1709 }
1710 #pragma optimize("", on)
1711 #endif
1712
1713 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1714 _bci = 0;
1715 _line = 0;
1716 };
1717
1718
1719 bool CompressedLineNumberReadStream::read_pair() {
1720 jubyte next = read_byte();
1721 // Check for terminator
1722 if (next == 0) return false;
1723 if (next == 0xFF) {
1724 // Escape character, regular compression used
1725 _bci += read_signed_int();
1726 _line += read_signed_int();
1727 } else {
1728 // Single byte compression used
1729 _bci += next >> 3;
1730 _line += next & 0x7;
1731 }
1732 return true;
1733 }
1734
1735 #if INCLUDE_JVMTI
1736
1737 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1738 BreakpointInfo* bp = method_holder()->breakpoints();
1739 for (; bp != NULL; bp = bp->next()) {
1740 if (bp->match(this, bci)) {
1741 return bp->orig_bytecode();
1742 }
1743 }
1744 {
1745 ResourceMark rm;
1746 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1747 }
1748 return Bytecodes::_shouldnotreachhere;
1749 }
1750
1751 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1752 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1753 BreakpointInfo* bp = method_holder()->breakpoints();
1754 for (; bp != NULL; bp = bp->next()) {
1755 if (bp->match(this, bci)) {
1756 bp->set_orig_bytecode(code);
1757 // and continue, in case there is more than one
1758 }
1759 }
1760 }
1761
1762 void Method::set_breakpoint(int bci) {
1763 InstanceKlass* ik = method_holder();
1764 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1765 bp->set_next(ik->breakpoints());
1766 ik->set_breakpoints(bp);
1767 // do this last:
1768 bp->set(this);
1769 }
1770
1771 static void clear_matches(Method* m, int bci) {
1772 InstanceKlass* ik = m->method_holder();
1773 BreakpointInfo* prev_bp = NULL;
1774 BreakpointInfo* next_bp;
1775 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1776 next_bp = bp->next();
1777 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1778 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1779 // do this first:
1780 bp->clear(m);
1781 // unhook it
1782 if (prev_bp != NULL)
1783 prev_bp->set_next(next_bp);
1784 else
1785 ik->set_breakpoints(next_bp);
1786 delete bp;
1787 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1788 // at same location. So we have multiple matching (method_index and bci)
1789 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1790 // breakpoint for clear_breakpoint request and keep all other method versions
1791 // BreakpointInfo for future clear_breakpoint request.
1792 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1793 // which is being called when class is unloaded. We delete all the Breakpoint
1794 // information for all versions of method. We may not correctly restore the original
1795 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1796 // so these methods won't be used anymore.
1797 if (bci >= 0) {
1798 break;
1799 }
1800 } else {
1801 // This one is a keeper.
1802 prev_bp = bp;
1803 }
1804 }
1805 }
1806
1807 void Method::clear_breakpoint(int bci) {
1808 assert(bci >= 0, "");
1809 clear_matches(this, bci);
1810 }
1811
1812 void Method::clear_all_breakpoints() {
1813 clear_matches(this, -1);
1814 }
1815
1816 #endif // INCLUDE_JVMTI
1817
1818 int Method::invocation_count() {
1819 MethodCounters *mcs = method_counters();
1820 if (TieredCompilation) {
1821 MethodData* const mdo = method_data();
1822 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1823 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1824 return InvocationCounter::count_limit;
1825 } else {
1826 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1827 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1828 }
1829 } else {
1830 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1831 }
1832 }
1833
1834 int Method::backedge_count() {
1835 MethodCounters *mcs = method_counters();
1836 if (TieredCompilation) {
1837 MethodData* const mdo = method_data();
1838 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1839 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1840 return InvocationCounter::count_limit;
1841 } else {
1842 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1843 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1844 }
1845 } else {
1846 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1847 }
1848 }
1849
1850 int Method::highest_comp_level() const {
1851 const MethodCounters* mcs = method_counters();
1852 if (mcs != NULL) {
1853 return mcs->highest_comp_level();
1854 } else {
1855 return CompLevel_none;
1856 }
1857 }
1858
1859 int Method::highest_osr_comp_level() const {
1860 const MethodCounters* mcs = method_counters();
1861 if (mcs != NULL) {
1862 return mcs->highest_osr_comp_level();
1863 } else {
1864 return CompLevel_none;
1865 }
1866 }
1867
1868 void Method::set_highest_comp_level(int level) {
1869 MethodCounters* mcs = method_counters();
1870 if (mcs != NULL) {
1871 mcs->set_highest_comp_level(level);
1872 }
1873 }
1874
1875 void Method::set_highest_osr_comp_level(int level) {
1876 MethodCounters* mcs = method_counters();
1877 if (mcs != NULL) {
1878 mcs->set_highest_osr_comp_level(level);
1879 }
1880 }
1881
1882 #if INCLUDE_JVMTI
1883
1884 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1885 _bci = bci;
1886 _name_index = m->name_index();
1887 _signature_index = m->signature_index();
1888 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1889 if (_orig_bytecode == Bytecodes::_breakpoint)
1890 _orig_bytecode = m->orig_bytecode_at(_bci);
1891 _next = NULL;
1892 }
1893
1894 void BreakpointInfo::set(Method* method) {
1895 #ifdef ASSERT
1896 {
1897 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1898 if (code == Bytecodes::_breakpoint)
1899 code = method->orig_bytecode_at(_bci);
1900 assert(orig_bytecode() == code, "original bytecode must be the same");
1901 }
1902 #endif
1903 Thread *thread = Thread::current();
1904 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1905 method->incr_number_of_breakpoints(thread);
1906 SystemDictionary::notice_modification();
1907 {
1908 // Deoptimize all dependents on this method
1909 HandleMark hm(thread);
1910 methodHandle mh(thread, method);
1911 CodeCache::flush_dependents_on_method(mh);
1912 }
1913 }
1914
1915 void BreakpointInfo::clear(Method* method) {
1916 *method->bcp_from(_bci) = orig_bytecode();
1917 assert(method->number_of_breakpoints() > 0, "must not go negative");
1918 method->decr_number_of_breakpoints(Thread::current());
1919 }
1920
1921 #endif // INCLUDE_JVMTI
1922
1923 // jmethodID handling
1924
1925 // This is a block allocating object, sort of like JNIHandleBlock, only a
1926 // lot simpler.
1927 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1928 // never get rid of it.
1929
1930 static const int min_block_size = 8;
1931
1932 class JNIMethodBlockNode : public CHeapObj<mtClass> {
1933 friend class JNIMethodBlock;
1934 Method** _methods;
1935 int _number_of_methods;
1936 int _top;
1937 JNIMethodBlockNode* _next;
1938
1939 public:
1940
1941 JNIMethodBlockNode(int num_methods = min_block_size);
1942
1943 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
1944
1945 void ensure_methods(int num_addl_methods) {
1946 if (_top < _number_of_methods) {
1947 num_addl_methods -= _number_of_methods - _top;
1948 if (num_addl_methods <= 0) {
1949 return;
1950 }
1951 }
1952 if (_next == NULL) {
1953 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
1954 } else {
1955 _next->ensure_methods(num_addl_methods);
1956 }
1957 }
1958 };
1959
1960 class JNIMethodBlock : public CHeapObj<mtClass> {
1961 JNIMethodBlockNode _head;
1962 JNIMethodBlockNode *_last_free;
1963 public:
1964 static Method* const _free_method;
1965
1966 JNIMethodBlock(int initial_capacity = min_block_size)
1967 : _head(initial_capacity), _last_free(&_head) {}
1968
1969 void ensure_methods(int num_addl_methods) {
1970 _last_free->ensure_methods(num_addl_methods);
1971 }
1972
1973 Method** add_method(Method* m) {
1974 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) {
1975 if (b->_top < b->_number_of_methods) {
1976 // top points to the next free entry.
1977 int i = b->_top;
1978 b->_methods[i] = m;
1979 b->_top++;
1980 _last_free = b;
1981 return &(b->_methods[i]);
1982 } else if (b->_top == b->_number_of_methods) {
1983 // if the next free entry ran off the block see if there's a free entry
1984 for (int i = 0; i < b->_number_of_methods; i++) {
1985 if (b->_methods[i] == _free_method) {
1986 b->_methods[i] = m;
1987 _last_free = b;
1988 return &(b->_methods[i]);
1989 }
1990 }
1991 // Only check each block once for frees. They're very unlikely.
1992 // Increment top past the end of the block.
1993 b->_top++;
1994 }
1995 // need to allocate a next block.
1996 if (b->_next == NULL) {
1997 b->_next = _last_free = new JNIMethodBlockNode();
1998 }
1999 }
2000 guarantee(false, "Should always allocate a free block");
2001 return NULL;
2002 }
2003
2004 bool contains(Method** m) {
2005 if (m == NULL) return false;
2006 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2007 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2008 // This is a bit of extra checking, for two reasons. One is
2009 // that contains() deals with pointers that are passed in by
2010 // JNI code, so making sure that the pointer is aligned
2011 // correctly is valuable. The other is that <= and > are
2012 // technically not defined on pointers, so the if guard can
2013 // pass spuriously; no modern compiler is likely to make that
2014 // a problem, though (and if one did, the guard could also
2015 // fail spuriously, which would be bad).
2016 ptrdiff_t idx = m - b->_methods;
2017 if (b->_methods + idx == m) {
2018 return true;
2019 }
2020 }
2021 }
2022 return false; // not found
2023 }
2024
2025 // Doesn't really destroy it, just marks it as free so it can be reused.
2026 void destroy_method(Method** m) {
2027 #ifdef ASSERT
2028 assert(contains(m), "should be a methodID");
2029 #endif // ASSERT
2030 *m = _free_method;
2031 }
2032
2033 // During class unloading the methods are cleared, which is different
2034 // than freed.
2035 void clear_all_methods() {
2036 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2037 for (int i = 0; i< b->_number_of_methods; i++) {
2038 b->_methods[i] = NULL;
2039 }
2040 }
2041 }
2042 #ifndef PRODUCT
2043 int count_methods() {
2044 // count all allocated methods
2045 int count = 0;
2046 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2047 for (int i = 0; i< b->_number_of_methods; i++) {
2048 if (b->_methods[i] != _free_method) count++;
2049 }
2050 }
2051 return count;
2052 }
2053 #endif // PRODUCT
2054 };
2055
2056 // Something that can't be mistaken for an address or a markOop
2057 Method* const JNIMethodBlock::_free_method = (Method*)55;
2058
2059 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) {
2060 _number_of_methods = MAX2(num_methods, min_block_size);
2061 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2062 for (int i = 0; i < _number_of_methods; i++) {
2063 _methods[i] = JNIMethodBlock::_free_method;
2064 }
2065 }
2066
2067 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
2068 ClassLoaderData* cld = loader_data;
2069 if (!SafepointSynchronize::is_at_safepoint()) {
2070 // Have to add jmethod_ids() to class loader data thread-safely.
2071 // Also have to add the method to the list safely, which the cld lock
2072 // protects as well.
2073 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2074 if (cld->jmethod_ids() == NULL) {
2075 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2076 } else {
2077 cld->jmethod_ids()->ensure_methods(capacity);
2078 }
2079 } else {
2080 // At safepoint, we are single threaded and can set this.
2081 if (cld->jmethod_ids() == NULL) {
2082 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2083 } else {
2084 cld->jmethod_ids()->ensure_methods(capacity);
2085 }
2086 }
2087 }
2088
2089 // Add a method id to the jmethod_ids
2090 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
2091 ClassLoaderData* cld = loader_data;
2092
2093 if (!SafepointSynchronize::is_at_safepoint()) {
2094 // Have to add jmethod_ids() to class loader data thread-safely.
2095 // Also have to add the method to the list safely, which the cld lock
2096 // protects as well.
2097 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2098 if (cld->jmethod_ids() == NULL) {
2099 cld->set_jmethod_ids(new JNIMethodBlock());
2100 }
2101 // jmethodID is a pointer to Method*
2102 return (jmethodID)cld->jmethod_ids()->add_method(m);
2103 } else {
2104 // At safepoint, we are single threaded and can set this.
2105 if (cld->jmethod_ids() == NULL) {
2106 cld->set_jmethod_ids(new JNIMethodBlock());
2107 }
2108 // jmethodID is a pointer to Method*
2109 return (jmethodID)cld->jmethod_ids()->add_method(m);
2110 }
2111 }
2112
2113 // Mark a jmethodID as free. This is called when there is a data race in
2114 // InstanceKlass while creating the jmethodID cache.
2115 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
2116 ClassLoaderData* cld = loader_data;
2117 Method** ptr = (Method**)m;
2118 assert(cld->jmethod_ids() != NULL, "should have method handles");
2119 cld->jmethod_ids()->destroy_method(ptr);
2120 }
2121
2122 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2123 // Can't assert the method_holder is the same because the new method has the
2124 // scratch method holder.
2125 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2126 == new_method->method_holder()->class_loader(),
2127 "changing to a different class loader");
2128 // Just change the method in place, jmethodID pointer doesn't change.
2129 *((Method**)jmid) = new_method;
2130 }
2131
2132 bool Method::is_method_id(jmethodID mid) {
2133 Method* m = resolve_jmethod_id(mid);
2134 assert(m != NULL, "should be called with non-null method");
2135 InstanceKlass* ik = m->method_holder();
2136 ClassLoaderData* cld = ik->class_loader_data();
2137 if (cld->jmethod_ids() == NULL) return false;
2138 return (cld->jmethod_ids()->contains((Method**)mid));
2139 }
2140
2141 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2142 if (mid == NULL) return NULL;
2143 Method* o = resolve_jmethod_id(mid);
2144 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
2145 return NULL;
2146 }
2147 return o;
2148 };
2149
2150 void Method::set_on_stack(const bool value) {
2151 // Set both the method itself and its constant pool. The constant pool
2152 // on stack means some method referring to it is also on the stack.
2153 constants()->set_on_stack(value);
2154
2155 bool already_set = on_stack();
2156 _access_flags.set_on_stack(value);
2157 if (value && !already_set) {
2158 MetadataOnStackMark::record(this);
2159 }
2160 }
2161
2162 // Called when the class loader is unloaded to make all methods weak.
2163 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2164 loader_data->jmethod_ids()->clear_all_methods();
2165 }
2166
2167 bool Method::has_method_vptr(const void* ptr) {
2168 Method m;
2169 // This assumes that the vtbl pointer is the first word of a C++ object.
2170 // This assumption is also in universe.cpp patch_klass_vtble
2171 return dereference_vptr(&m) == dereference_vptr(ptr);
2172 }
2173
2174 // Check that this pointer is valid by checking that the vtbl pointer matches
2175 bool Method::is_valid_method() const {
2176 if (this == NULL) {
2177 return false;
2178 } else if ((intptr_t(this) & (wordSize-1)) != 0) {
2179 // Quick sanity check on pointer.
2180 return false;
2181 } else if (!is_metaspace_object()) {
2182 return false;
2183 } else {
2184 return has_method_vptr((const void*)this);
2185 }
2186 }
2187
2188 #ifndef PRODUCT
2189 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
2190 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
2191 }
2192 #endif // PRODUCT
2193
2194
2195 // Printing
2196
2197 #ifndef PRODUCT
2198
2199 void Method::print_on(outputStream* st) const {
2200 ResourceMark rm;
2201 assert(is_method(), "must be method");
2202 st->print_cr("%s", internal_name());
2203 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this));
2204 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2205 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants()));
2206 constants()->print_value_on(st); st->cr();
2207 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2208 st->print (" - name: "); name()->print_value_on(st); st->cr();
2209 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2210 st->print_cr(" - max stack: %d", max_stack());
2211 st->print_cr(" - max locals: %d", max_locals());
2212 st->print_cr(" - size of params: %d", size_of_parameters());
2213 st->print_cr(" - method size: %d", method_size());
2214 if (intrinsic_id() != vmIntrinsics::_none)
2215 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
2216 if (highest_comp_level() != CompLevel_none)
2217 st->print_cr(" - highest level: %d", highest_comp_level());
2218 st->print_cr(" - vtable index: %d", _vtable_index);
2219 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry()));
2220 st->print( " - adapters: ");
2221 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2222 if (a == NULL)
2223 st->print_cr(INTPTR_FORMAT, p2i(a));
2224 else
2225 a->print_adapter_on(st);
2226 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry()));
2227 st->print_cr(" - code size: %d", code_size());
2228 if (code_size() != 0) {
2229 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base()));
2230 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size()));
2231 }
2232 if (method_data() != NULL) {
2233 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data()));
2234 }
2235 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2236 if (checked_exceptions_length() > 0) {
2237 CheckedExceptionElement* table = checked_exceptions_start();
2238 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table));
2239 if (Verbose) {
2240 for (int i = 0; i < checked_exceptions_length(); i++) {
2241 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2242 }
2243 }
2244 }
2245 if (has_linenumber_table()) {
2246 u_char* table = compressed_linenumber_table();
2247 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table));
2248 if (Verbose) {
2249 CompressedLineNumberReadStream stream(table);
2250 while (stream.read_pair()) {
2251 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2252 }
2253 }
2254 }
2255 st->print_cr(" - localvar length: %d", localvariable_table_length());
2256 if (localvariable_table_length() > 0) {
2257 LocalVariableTableElement* table = localvariable_table_start();
2258 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table));
2259 if (Verbose) {
2260 for (int i = 0; i < localvariable_table_length(); i++) {
2261 int bci = table[i].start_bci;
2262 int len = table[i].length;
2263 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2264 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2265 int slot = table[i].slot;
2266 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2267 }
2268 }
2269 }
2270 if (code() != NULL) {
2271 st->print (" - compiled code: ");
2272 code()->print_value_on(st);
2273 }
2274 if (is_native()) {
2275 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function()));
2276 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler()));
2277 }
2278 }
2279
2280 void Method::print_linkage_flags(outputStream* st) {
2281 access_flags().print_on(st);
2282 if (is_default_method()) {
2283 st->print("default ");
2284 }
2285 if (is_overpass()) {
2286 st->print("overpass ");
2287 }
2288 }
2289 #endif //PRODUCT
2290
2291 void Method::print_value_on(outputStream* st) const {
2292 assert(is_method(), "must be method");
2293 st->print("%s", internal_name());
2294 print_address_on(st);
2295 st->print(" ");
2296 name()->print_value_on(st);
2297 st->print(" ");
2298 signature()->print_value_on(st);
2299 st->print(" in ");
2300 method_holder()->print_value_on(st);
2301 if (WizardMode) st->print("#%d", _vtable_index);
2302 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2303 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2304 }
2305
2306 #if INCLUDE_SERVICES
2307 // Size Statistics
2308 void Method::collect_statistics(KlassSizeStats *sz) const {
2309 int mysize = sz->count(this);
2310 sz->_method_bytes += mysize;
2311 sz->_method_all_bytes += mysize;
2312 sz->_rw_bytes += mysize;
2313
2314 if (constMethod()) {
2315 constMethod()->collect_statistics(sz);
2316 }
2317 if (method_data()) {
2318 method_data()->collect_statistics(sz);
2319 }
2320 }
2321 #endif // INCLUDE_SERVICES
2322
2323 // LogTouchedMethods and PrintTouchedMethods
2324
2325 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because
2326 // the Method may be garbage collected. Let's roll our own hash table.
2327 class TouchedMethodRecord : CHeapObj<mtTracing> {
2328 public:
2329 // It's OK to store Symbols here because they will NOT be GC'ed if
2330 // LogTouchedMethods is enabled.
2331 TouchedMethodRecord* _next;
2332 Symbol* _class_name;
2333 Symbol* _method_name;
2334 Symbol* _method_signature;
2335 };
2336
2337 static const int TOUCHED_METHOD_TABLE_SIZE = 20011;
2338 static TouchedMethodRecord** _touched_method_table = NULL;
2339
2340 void Method::log_touched(TRAPS) {
2341
2342 const int table_size = TOUCHED_METHOD_TABLE_SIZE;
2343 Symbol* my_class = klass_name();
2344 Symbol* my_name = name();
2345 Symbol* my_sig = signature();
2346
2347 unsigned int hash = my_class->identity_hash() +
2348 my_name->identity_hash() +
2349 my_sig->identity_hash();
2350 juint index = juint(hash) % table_size;
2351
2352 MutexLocker ml(TouchedMethodLog_lock, THREAD);
2353 if (_touched_method_table == NULL) {
2354 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size,
2355 mtTracing, CURRENT_PC);
2356 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size);
2357 }
2358
2359 TouchedMethodRecord* ptr = _touched_method_table[index];
2360 while (ptr) {
2361 if (ptr->_class_name == my_class &&
2362 ptr->_method_name == my_name &&
2363 ptr->_method_signature == my_sig) {
2364 return;
2365 }
2366 if (ptr->_next == NULL) break;
2367 ptr = ptr->_next;
2368 }
2369 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing);
2370 my_class->set_permanent(); // prevent reclaimed by GC
2371 my_name->set_permanent();
2372 my_sig->set_permanent();
2373 nptr->_class_name = my_class;
2374 nptr->_method_name = my_name;
2375 nptr->_method_signature = my_sig;
2376 nptr->_next = NULL;
2377
2378 if (ptr == NULL) {
2379 // first
2380 _touched_method_table[index] = nptr;
2381 } else {
2382 ptr->_next = nptr;
2383 }
2384 }
2385
2386 void Method::print_touched_methods(outputStream* out) {
2387 MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock);
2388 out->print_cr("# Method::print_touched_methods version 1");
2389 if (_touched_method_table) {
2390 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) {
2391 TouchedMethodRecord* ptr = _touched_method_table[i];
2392 while(ptr) {
2393 ptr->_class_name->print_symbol_on(out); out->print(".");
2394 ptr->_method_name->print_symbol_on(out); out->print(":");
2395 ptr->_method_signature->print_symbol_on(out); out->cr();
2396 ptr = ptr->_next;
2397 }
2398 }
2399 }
2400 }
2401
2402 // Verification
2403
2404 void Method::verify_on(outputStream* st) {
2405 guarantee(is_method(), "object must be method");
2406 guarantee(constants()->is_constantPool(), "should be constant pool");
2407 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2408 MethodData* md = method_data();
2409 guarantee(md == NULL ||
2410 md->is_methodData(), "should be method data");
2411 }