1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/metadataOnStackMark.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/debugInfoRec.hpp"
30 #include "gc/shared/collectedHeap.inline.hpp"
31 #include "gc/shared/gcLocker.hpp"
32 #include "gc/shared/generation.hpp"
33 #include "interpreter/bytecodeStream.hpp"
34 #include "interpreter/bytecodeTracer.hpp"
35 #include "interpreter/bytecodes.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "interpreter/oopMapCache.hpp"
38 #include "memory/heapInspection.hpp"
39 #include "memory/metadataFactory.hpp"
40 #include "memory/metaspaceClosure.hpp"
41 #include "memory/metaspaceShared.hpp"
42 #include "memory/oopFactory.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "oops/constMethod.hpp"
45 #include "oops/method.hpp"
46 #include "oops/methodData.hpp"
47 #include "oops/objArrayOop.inline.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "oops/symbol.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "prims/methodHandles.hpp"
52 #include "prims/nativeLookup.hpp"
53 #include "runtime/arguments.hpp"
54 #include "runtime/compilationPolicy.hpp"
55 #include "runtime/frame.inline.hpp"
56 #include "runtime/handles.inline.hpp"
57 #include "runtime/init.hpp"
58 #include "runtime/orderAccess.inline.hpp"
59 #include "runtime/relocator.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/signature.hpp"
62 #include "utilities/align.hpp"
63 #include "utilities/quickSort.hpp"
64 #include "utilities/vmError.hpp"
65 #include "utilities/xmlstream.hpp"
66
67 // Implementation of Method
68
69 Method* Method::allocate(ClassLoaderData* loader_data,
70 int byte_code_size,
71 AccessFlags access_flags,
72 InlineTableSizes* sizes,
73 ConstMethod::MethodType method_type,
74 TRAPS) {
75 assert(!access_flags.is_native() || byte_code_size == 0,
76 "native methods should not contain byte codes");
77 ConstMethod* cm = ConstMethod::allocate(loader_data,
78 byte_code_size,
79 sizes,
80 method_type,
81 CHECK_NULL);
82 int size = Method::size(access_flags.is_native());
83 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags);
84 }
85
86 Method::Method(ConstMethod* xconst, AccessFlags access_flags) {
87 NoSafepointVerifier no_safepoint;
88 set_constMethod(xconst);
89 set_access_flags(access_flags);
90 set_intrinsic_id(vmIntrinsics::_none);
91 set_force_inline(false);
92 set_hidden(false);
93 set_dont_inline(false);
94 set_has_injected_profile(false);
95 set_method_data(NULL);
96 clear_method_counters();
97 set_vtable_index(Method::garbage_vtable_index);
98
99 // Fix and bury in Method*
100 set_interpreter_entry(NULL); // sets i2i entry and from_int
101 set_adapter_entry(NULL);
102 clear_code(false /* don't need a lock */); // from_c/from_i get set to c2i/i2i
103
104 if (access_flags.is_native()) {
105 clear_native_function();
106 set_signature_handler(NULL);
107 }
108
109 NOT_PRODUCT(set_compiled_invocation_count(0);)
110 }
111
112 // Release Method*. The nmethod will be gone when we get here because
113 // we've walked the code cache.
114 void Method::deallocate_contents(ClassLoaderData* loader_data) {
115 MetadataFactory::free_metadata(loader_data, constMethod());
116 set_constMethod(NULL);
117 MetadataFactory::free_metadata(loader_data, method_data());
118 set_method_data(NULL);
119 MetadataFactory::free_metadata(loader_data, method_counters());
120 clear_method_counters();
121 // The nmethod will be gone when we get here.
122 if (code() != NULL) _code = NULL;
123 }
124
125 address Method::get_i2c_entry() {
126 assert(adapter() != NULL, "must have");
127 return adapter()->get_i2c_entry();
128 }
129
130 address Method::get_c2i_entry() {
131 assert(adapter() != NULL, "must have");
132 return adapter()->get_c2i_entry();
133 }
134
135 address Method::get_c2i_unverified_entry() {
136 assert(adapter() != NULL, "must have");
137 return adapter()->get_c2i_unverified_entry();
138 }
139
140 char* Method::name_and_sig_as_C_string() const {
141 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
142 }
143
144 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
145 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
146 }
147
148 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
149 const char* klass_name = klass->external_name();
150 int klass_name_len = (int)strlen(klass_name);
151 int method_name_len = method_name->utf8_length();
152 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
153 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
154 strcpy(dest, klass_name);
155 dest[klass_name_len] = '.';
156 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
157 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
158 dest[len] = 0;
159 return dest;
160 }
161
162 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
163 Symbol* klass_name = klass->name();
164 klass_name->as_klass_external_name(buf, size);
165 int len = (int)strlen(buf);
166
167 if (len < size - 1) {
168 buf[len++] = '.';
169
170 method_name->as_C_string(&(buf[len]), size - len);
171 len = (int)strlen(buf);
172
173 signature->as_C_string(&(buf[len]), size - len);
174 }
175
176 return buf;
177 }
178
179 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
180 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
181 // access exception table
182 ExceptionTable table(mh());
183 int length = table.length();
184 // iterate through all entries sequentially
185 constantPoolHandle pool(THREAD, mh->constants());
186 for (int i = 0; i < length; i ++) {
187 //reacquire the table in case a GC happened
188 ExceptionTable table(mh());
189 int beg_bci = table.start_pc(i);
190 int end_bci = table.end_pc(i);
191 assert(beg_bci <= end_bci, "inconsistent exception table");
192 if (beg_bci <= throw_bci && throw_bci < end_bci) {
193 // exception handler bci range covers throw_bci => investigate further
194 int handler_bci = table.handler_pc(i);
195 int klass_index = table.catch_type_index(i);
196 if (klass_index == 0) {
197 return handler_bci;
198 } else if (ex_klass == NULL) {
199 return handler_bci;
200 } else {
201 // we know the exception class => get the constraint class
202 // this may require loading of the constraint class; if verification
203 // fails or some other exception occurs, return handler_bci
204 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
205 assert(k != NULL, "klass not loaded");
206 if (ex_klass->is_subtype_of(k)) {
207 return handler_bci;
208 }
209 }
210 }
211 }
212
213 return -1;
214 }
215
216 void Method::mask_for(int bci, InterpreterOopMap* mask) {
217 methodHandle h_this(Thread::current(), this);
218 // Only GC uses the OopMapCache during thread stack root scanning
219 // any other uses generate an oopmap but do not save it in the cache.
220 if (Universe::heap()->is_gc_active()) {
221 method_holder()->mask_for(h_this, bci, mask);
222 } else {
223 OopMapCache::compute_one_oop_map(h_this, bci, mask);
224 }
225 return;
226 }
227
228
229 int Method::bci_from(address bcp) const {
230 if (is_native() && bcp == 0) {
231 return 0;
232 }
233 #ifdef ASSERT
234 {
235 ResourceMark rm;
236 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(),
237 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s",
238 p2i(bcp), name_and_sig_as_C_string());
239 }
240 #endif
241 return bcp - code_base();
242 }
243
244
245 int Method::validate_bci(int bci) const {
246 return (bci == 0 || bci < code_size()) ? bci : -1;
247 }
248
249 // Return bci if it appears to be a valid bcp
250 // Return -1 otherwise.
251 // Used by profiling code, when invalid data is a possibility.
252 // The caller is responsible for validating the Method* itself.
253 int Method::validate_bci_from_bcp(address bcp) const {
254 // keep bci as -1 if not a valid bci
255 int bci = -1;
256 if (bcp == 0 || bcp == code_base()) {
257 // code_size() may return 0 and we allow 0 here
258 // the method may be native
259 bci = 0;
260 } else if (contains(bcp)) {
261 bci = bcp - code_base();
262 }
263 // Assert that if we have dodged any asserts, bci is negative.
264 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
265 return bci;
266 }
267
268 address Method::bcp_from(int bci) const {
269 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
270 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
271 address bcp = code_base() + bci;
272 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
273 return bcp;
274 }
275
276 address Method::bcp_from(address bcp) const {
277 if (is_native() && bcp == NULL) {
278 return code_base();
279 } else {
280 return bcp;
281 }
282 }
283
284 int Method::size(bool is_native) {
285 // If native, then include pointers for native_function and signature_handler
286 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
287 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
288 return align_metadata_size(header_size() + extra_words);
289 }
290
291
292 Symbol* Method::klass_name() const {
293 return method_holder()->name();
294 }
295
296
297 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
298 log_trace(cds)("Iter(Method): %p", this);
299
300 it->push(&_constMethod);
301 it->push(&_method_data);
302 it->push(&_method_counters);
303 }
304
305 // Attempt to return method oop to original state. Clear any pointers
306 // (to objects outside the shared spaces). We won't be able to predict
307 // where they should point in a new JVM. Further initialize some
308 // entries now in order allow them to be write protected later.
309
310 void Method::remove_unshareable_info() {
311 unlink_method();
312 }
313
314 void Method::set_vtable_index(int index) {
315 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
316 // At runtime initialize_vtable is rerun as part of link_class_impl()
317 // for a shared class loaded by the non-boot loader to obtain the loader
318 // constraints based on the runtime classloaders' context.
319 return; // don't write into the shared class
320 } else {
321 _vtable_index = index;
322 }
323 }
324
325 void Method::set_itable_index(int index) {
326 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
327 // At runtime initialize_itable is rerun as part of link_class_impl()
328 // for a shared class loaded by the non-boot loader to obtain the loader
329 // constraints based on the runtime classloaders' context. The dumptime
330 // itable index should be the same as the runtime index.
331 assert(_vtable_index == itable_index_max - index,
332 "archived itable index is different from runtime index");
333 return; // don’t write into the shared class
334 } else {
335 _vtable_index = itable_index_max - index;
336 }
337 assert(valid_itable_index(), "");
338 }
339
340
341
342 bool Method::was_executed_more_than(int n) {
343 // Invocation counter is reset when the Method* is compiled.
344 // If the method has compiled code we therefore assume it has
345 // be excuted more than n times.
346 if (is_accessor() || is_empty_method() || (code() != NULL)) {
347 // interpreter doesn't bump invocation counter of trivial methods
348 // compiler does not bump invocation counter of compiled methods
349 return true;
350 }
351 else if ((method_counters() != NULL &&
352 method_counters()->invocation_counter()->carry()) ||
353 (method_data() != NULL &&
354 method_data()->invocation_counter()->carry())) {
355 // The carry bit is set when the counter overflows and causes
356 // a compilation to occur. We don't know how many times
357 // the counter has been reset, so we simply assume it has
358 // been executed more than n times.
359 return true;
360 } else {
361 return invocation_count() > n;
362 }
363 }
364
365 void Method::print_invocation_count() {
366 if (is_static()) tty->print("static ");
367 if (is_final()) tty->print("final ");
368 if (is_synchronized()) tty->print("synchronized ");
369 if (is_native()) tty->print("native ");
370 tty->print("%s::", method_holder()->external_name());
371 name()->print_symbol_on(tty);
372 signature()->print_symbol_on(tty);
373
374 if (WizardMode) {
375 // dump the size of the byte codes
376 tty->print(" {%d}", code_size());
377 }
378 tty->cr();
379
380 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
381 tty->print_cr (" invocation_counter: %8d ", invocation_count());
382 tty->print_cr (" backedge_counter: %8d ", backedge_count());
383 #ifndef PRODUCT
384 if (CountCompiledCalls) {
385 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
386 }
387 #endif
388 }
389
390 // Build a MethodData* object to hold information about this method
391 // collected in the interpreter.
392 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) {
393 // Do not profile the method if metaspace has hit an OOM previously
394 // allocating profiling data. Callers clear pending exception so don't
395 // add one here.
396 if (ClassLoaderDataGraph::has_metaspace_oom()) {
397 return;
398 }
399
400 // Grab a lock here to prevent multiple
401 // MethodData*s from being created.
402 MutexLocker ml(MethodData_lock, THREAD);
403 if (method->method_data() == NULL) {
404 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
405 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
406 if (HAS_PENDING_EXCEPTION) {
407 CompileBroker::log_metaspace_failure();
408 ClassLoaderDataGraph::set_metaspace_oom(true);
409 return; // return the exception (which is cleared)
410 }
411
412 method->set_method_data(method_data);
413 if (PrintMethodData && (Verbose || WizardMode)) {
414 ResourceMark rm(THREAD);
415 tty->print("build_interpreter_method_data for ");
416 method->print_name(tty);
417 tty->cr();
418 // At the end of the run, the MDO, full of data, will be dumped.
419 }
420 }
421 }
422
423 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
424 // Do not profile the method if metaspace has hit an OOM previously
425 if (ClassLoaderDataGraph::has_metaspace_oom()) {
426 return NULL;
427 }
428
429 methodHandle mh(m);
430 MethodCounters* counters = MethodCounters::allocate(mh, THREAD);
431 if (HAS_PENDING_EXCEPTION) {
432 CompileBroker::log_metaspace_failure();
433 ClassLoaderDataGraph::set_metaspace_oom(true);
434 return NULL; // return the exception (which is cleared)
435 }
436 if (!mh->init_method_counters(counters)) {
437 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
438 }
439
440 if (LogTouchedMethods) {
441 mh->log_touched(CHECK_NULL);
442 }
443
444 return mh->method_counters();
445 }
446
447 void Method::cleanup_inline_caches() {
448 // The current system doesn't use inline caches in the interpreter
449 // => nothing to do (keep this method around for future use)
450 }
451
452
453 int Method::extra_stack_words() {
454 // not an inline function, to avoid a header dependency on Interpreter
455 return extra_stack_entries() * Interpreter::stackElementSize;
456 }
457
458
459 void Method::compute_size_of_parameters(Thread *thread) {
460 ArgumentSizeComputer asc(signature());
461 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
462 }
463
464 BasicType Method::result_type() const {
465 ResultTypeFinder rtf(signature());
466 return rtf.type();
467 }
468
469
470 bool Method::is_empty_method() const {
471 return code_size() == 1
472 && *code_base() == Bytecodes::_return;
473 }
474
475
476 bool Method::is_vanilla_constructor() const {
477 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
478 // which only calls the superclass vanilla constructor and possibly does stores of
479 // zero constants to local fields:
480 //
481 // aload_0
482 // invokespecial
483 // indexbyte1
484 // indexbyte2
485 //
486 // followed by an (optional) sequence of:
487 //
488 // aload_0
489 // aconst_null / iconst_0 / fconst_0 / dconst_0
490 // putfield
491 // indexbyte1
492 // indexbyte2
493 //
494 // followed by:
495 //
496 // return
497
498 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
499 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
500 int size = code_size();
501 // Check if size match
502 if (size == 0 || size % 5 != 0) return false;
503 address cb = code_base();
504 int last = size - 1;
505 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
506 // Does not call superclass default constructor
507 return false;
508 }
509 // Check optional sequence
510 for (int i = 4; i < last; i += 5) {
511 if (cb[i] != Bytecodes::_aload_0) return false;
512 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
513 if (cb[i+2] != Bytecodes::_putfield) return false;
514 }
515 return true;
516 }
517
518
519 bool Method::compute_has_loops_flag() {
520 BytecodeStream bcs(this);
521 Bytecodes::Code bc;
522
523 while ((bc = bcs.next()) >= 0) {
524 switch( bc ) {
525 case Bytecodes::_ifeq:
526 case Bytecodes::_ifnull:
527 case Bytecodes::_iflt:
528 case Bytecodes::_ifle:
529 case Bytecodes::_ifne:
530 case Bytecodes::_ifnonnull:
531 case Bytecodes::_ifgt:
532 case Bytecodes::_ifge:
533 case Bytecodes::_if_icmpeq:
534 case Bytecodes::_if_icmpne:
535 case Bytecodes::_if_icmplt:
536 case Bytecodes::_if_icmpgt:
537 case Bytecodes::_if_icmple:
538 case Bytecodes::_if_icmpge:
539 case Bytecodes::_if_acmpeq:
540 case Bytecodes::_if_acmpne:
541 case Bytecodes::_goto:
542 case Bytecodes::_jsr:
543 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
544 break;
545
546 case Bytecodes::_goto_w:
547 case Bytecodes::_jsr_w:
548 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
549 break;
550
551 default:
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 set_method_data(NULL);
948 clear_method_counters();
949 }
950 #endif
951
952 /****************************************************************************
953 // The following illustrates how the entries work for CDS shared Methods:
954 //
955 // Our goal is to delay writing into a shared Method until it's compiled.
956 // Hence, we want to determine the initial values for _i2i_entry,
957 // _from_interpreted_entry and _from_compiled_entry during CDS dump time.
958 //
959 // In this example, both Methods A and B have the _i2i_entry of "zero_locals".
960 // They also have similar signatures so that they will share the same
961 // AdapterHandlerEntry.
962 //
963 // _adapter_trampoline points to a fixed location in the RW section of
964 // the CDS archive. This location initially contains a NULL pointer. When the
965 // first of method A or B is linked, an AdapterHandlerEntry is allocated
966 // dynamically, and its c2i/i2c entries are generated.
967 //
968 // _i2i_entry and _from_interpreted_entry initially points to the same
969 // (fixed) location in the CODE section of the CDS archive. This contains
970 // an unconditional branch to the actual entry for "zero_locals", which is
971 // generated at run time and may be on an arbitrary address. Thus, the
972 // unconditional branch is also generated at run time to jump to the correct
973 // address.
974 //
975 // Similarly, _from_compiled_entry points to a fixed address in the CODE
976 // section. This address has enough space for an unconditional branch
977 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is
978 // initialized, and the address for the actual c2i_entry is known, we emit a
979 // branch instruction here to branch to the actual c2i_entry.
980 //
981 // The effect of the extra branch on the i2i and c2i entries is negligible.
982 //
983 // The reason for putting _adapter_trampoline in RO is many shared Methods
984 // share the same AdapterHandlerEntry, so we can save space in the RW section
985 // by having the extra indirection.
986
987
988 [Method A: RW]
989 _constMethod ----> [ConstMethod: RO]
990 _adapter_trampoline -----------+
991 |
992 _i2i_entry (same value as method B) |
993 _from_interpreted_entry (same value as method B) |
994 _from_compiled_entry (same value as method B) |
995 |
996 |
997 [Method B: RW] +--------+
998 _constMethod ----> [ConstMethod: RO] |
999 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+
1000 |
1001 +-------------------------------+
1002 |
1003 +----> [AdapterHandlerEntry] (allocated at run time)
1004 _fingerprint
1005 _c2i_entry ---------------------------------+->[c2i entry..]
1006 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] |
1007 _from_interpreted_entry | _c2i_unverified_entry | |
1008 | | | |
1009 | | (_cds_entry_table: CODE) | |
1010 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | |
1011 | | (allocated at run time) | |
1012 | | ... [asm code ...] | |
1013 +-[not compiled]-+ [n]: jmp _entry_table[n] | |
1014 | | |
1015 | | |
1016 +-[compiled]-------------------------------------------------------------------+ |
1017 |
1018 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) |
1019 [jmp c2i_entry] ------------------------------------------------------+
1020
1021 ***/
1022
1023 // Called when the method_holder is getting linked. Setup entrypoints so the method
1024 // is ready to be called from interpreter, compiler, and vtables.
1025 void Method::link_method(const methodHandle& h_method, TRAPS) {
1026 // If the code cache is full, we may reenter this function for the
1027 // leftover methods that weren't linked.
1028 if (is_shared()) {
1029 address entry = Interpreter::entry_for_cds_method(h_method);
1030 assert(entry != NULL && entry == _i2i_entry,
1031 "should be correctly set during dump time");
1032 if (adapter() != NULL) {
1033 return;
1034 }
1035 assert(entry == _from_interpreted_entry,
1036 "should be correctly set during dump time");
1037 } else if (_i2i_entry != NULL) {
1038 return;
1039 }
1040 assert( _code == NULL, "nothing compiled yet" );
1041
1042 // Setup interpreter entrypoint
1043 assert(this == h_method(), "wrong h_method()" );
1044
1045 if (!is_shared()) {
1046 assert(adapter() == NULL, "init'd to NULL");
1047 address entry = Interpreter::entry_for_method(h_method);
1048 assert(entry != NULL, "interpreter entry must be non-null");
1049 // Sets both _i2i_entry and _from_interpreted_entry
1050 set_interpreter_entry(entry);
1051 }
1052
1053 // Don't overwrite already registered native entries.
1054 if (is_native() && !has_native_function()) {
1055 set_native_function(
1056 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1057 !native_bind_event_is_interesting);
1058 }
1059
1060 // Setup compiler entrypoint. This is made eagerly, so we do not need
1061 // special handling of vtables. An alternative is to make adapters more
1062 // lazily by calling make_adapter() from from_compiled_entry() for the
1063 // normal calls. For vtable calls life gets more complicated. When a
1064 // call-site goes mega-morphic we need adapters in all methods which can be
1065 // called from the vtable. We need adapters on such methods that get loaded
1066 // later. Ditto for mega-morphic itable calls. If this proves to be a
1067 // problem we'll make these lazily later.
1068 (void) make_adapters(h_method, CHECK);
1069
1070 // ONLY USE the h_method now as make_adapter may have blocked
1071
1072 }
1073
1074 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1075 // Adapters for compiled code are made eagerly here. They are fairly
1076 // small (generally < 100 bytes) and quick to make (and cached and shared)
1077 // so making them eagerly shouldn't be too expensive.
1078 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1079 if (adapter == NULL ) {
1080 if (!is_init_completed()) {
1081 // Don't throw exceptions during VM initialization because java.lang.* classes
1082 // might not have been initialized, causing problems when constructing the
1083 // Java exception object.
1084 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1085 } else {
1086 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1087 }
1088 }
1089
1090 if (mh->is_shared()) {
1091 assert(mh->adapter() == adapter, "must be");
1092 assert(mh->_from_compiled_entry != NULL, "must be");
1093 } else {
1094 mh->set_adapter_entry(adapter);
1095 mh->_from_compiled_entry = adapter->get_c2i_entry();
1096 }
1097 return adapter->get_c2i_entry();
1098 }
1099
1100 void Method::restore_unshareable_info(TRAPS) {
1101 assert(is_method() && is_valid_method(), "ensure C++ vtable is restored");
1102
1103 // Since restore_unshareable_info can be called more than once for a method, don't
1104 // redo any work.
1105 if (adapter() == NULL) {
1106 methodHandle mh(THREAD, this);
1107 link_method(mh, CHECK);
1108 }
1109 }
1110
1111 volatile address Method::from_compiled_entry_no_trampoline() const {
1112 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
1113 if (code) {
1114 return code->verified_entry_point();
1115 } else {
1116 return adapter()->get_c2i_entry();
1117 }
1118 }
1119
1120 // The verified_code_entry() must be called when a invoke is resolved
1121 // on this method.
1122
1123 // It returns the compiled code entry point, after asserting not null.
1124 // This function is called after potential safepoints so that nmethod
1125 // or adapter that it points to is still live and valid.
1126 // This function must not hit a safepoint!
1127 address Method::verified_code_entry() {
1128 debug_only(NoSafepointVerifier nsv;)
1129 assert(_from_compiled_entry != NULL, "must be set");
1130 return _from_compiled_entry;
1131 }
1132
1133 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1134 // (could be racing a deopt).
1135 // Not inline to avoid circular ref.
1136 bool Method::check_code() const {
1137 // cached in a register or local. There's a race on the value of the field.
1138 CompiledMethod *code = (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code);
1139 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1140 }
1141
1142 // Install compiled code. Instantly it can execute.
1143 void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
1144 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1145 assert( code, "use clear_code to remove code" );
1146 assert( mh->check_code(), "" );
1147
1148 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1149
1150 // These writes must happen in this order, because the interpreter will
1151 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1152 // which jumps to _from_compiled_entry.
1153 mh->_code = code; // Assign before allowing compiled code to exec
1154
1155 int comp_level = code->comp_level();
1156 // In theory there could be a race here. In practice it is unlikely
1157 // and not worth worrying about.
1158 if (comp_level > mh->highest_comp_level()) {
1159 mh->set_highest_comp_level(comp_level);
1160 }
1161
1162 OrderAccess::storestore();
1163 mh->_from_compiled_entry = code->verified_entry_point();
1164 OrderAccess::storestore();
1165 // Instantly compiled code can execute.
1166 if (!mh->is_method_handle_intrinsic())
1167 mh->_from_interpreted_entry = mh->get_i2c_entry();
1168 }
1169
1170
1171 bool Method::is_overridden_in(Klass* k) const {
1172 InstanceKlass* ik = InstanceKlass::cast(k);
1173
1174 if (ik->is_interface()) return false;
1175
1176 // If method is an interface, we skip it - except if it
1177 // is a miranda method
1178 if (method_holder()->is_interface()) {
1179 // Check that method is not a miranda method
1180 if (ik->lookup_method(name(), signature()) == NULL) {
1181 // No implementation exist - so miranda method
1182 return false;
1183 }
1184 return true;
1185 }
1186
1187 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1188 if (!has_vtable_index()) {
1189 return false;
1190 } else {
1191 Method* vt_m = ik->method_at_vtable(vtable_index());
1192 return vt_m != this;
1193 }
1194 }
1195
1196
1197 // give advice about whether this Method* should be cached or not
1198 bool Method::should_not_be_cached() const {
1199 if (is_old()) {
1200 // This method has been redefined. It is either EMCP or obsolete
1201 // and we don't want to cache it because that would pin the method
1202 // down and prevent it from being collectible if and when it
1203 // finishes executing.
1204 return true;
1205 }
1206
1207 // caching this method should be just fine
1208 return false;
1209 }
1210
1211
1212 /**
1213 * Returns true if this is one of the specially treated methods for
1214 * security related stack walks (like Reflection.getCallerClass).
1215 */
1216 bool Method::is_ignored_by_security_stack_walk() const {
1217 if (intrinsic_id() == vmIntrinsics::_invoke) {
1218 // This is Method.invoke() -- ignore it
1219 return true;
1220 }
1221 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1222 // This is an auxilary frame -- ignore it
1223 return true;
1224 }
1225 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1226 // This is an internal adapter frame for method handles -- ignore it
1227 return true;
1228 }
1229 return false;
1230 }
1231
1232
1233 // Constant pool structure for invoke methods:
1234 enum {
1235 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1236 _imcp_invoke_signature, // utf8: (variable Symbol*)
1237 _imcp_limit
1238 };
1239
1240 // Test if this method is an MH adapter frame generated by Java code.
1241 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1242 bool Method::is_compiled_lambda_form() const {
1243 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1244 }
1245
1246 // Test if this method is an internal MH primitive method.
1247 bool Method::is_method_handle_intrinsic() const {
1248 vmIntrinsics::ID iid = intrinsic_id();
1249 return (MethodHandles::is_signature_polymorphic(iid) &&
1250 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1251 }
1252
1253 bool Method::has_member_arg() const {
1254 vmIntrinsics::ID iid = intrinsic_id();
1255 return (MethodHandles::is_signature_polymorphic(iid) &&
1256 MethodHandles::has_member_arg(iid));
1257 }
1258
1259 // Make an instance of a signature-polymorphic internal MH primitive.
1260 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1261 Symbol* signature,
1262 TRAPS) {
1263 ResourceMark rm;
1264 methodHandle empty;
1265
1266 InstanceKlass* holder = SystemDictionary::MethodHandle_klass();
1267 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1268 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1269 if (TraceMethodHandles) {
1270 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1271 }
1272
1273 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1274 name->increment_refcount();
1275 signature->increment_refcount();
1276
1277 int cp_length = _imcp_limit;
1278 ClassLoaderData* loader_data = holder->class_loader_data();
1279 constantPoolHandle cp;
1280 {
1281 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1282 cp = constantPoolHandle(THREAD, cp_oop);
1283 }
1284 cp->set_pool_holder(holder);
1285 cp->symbol_at_put(_imcp_invoke_name, name);
1286 cp->symbol_at_put(_imcp_invoke_signature, signature);
1287 cp->set_has_preresolution();
1288
1289 // decide on access bits: public or not?
1290 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1291 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1292 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1293 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1294
1295 methodHandle m;
1296 {
1297 InlineTableSizes sizes;
1298 Method* m_oop = Method::allocate(loader_data, 0,
1299 accessFlags_from(flags_bits), &sizes,
1300 ConstMethod::NORMAL, CHECK_(empty));
1301 m = methodHandle(THREAD, m_oop);
1302 }
1303 m->set_constants(cp());
1304 m->set_name_index(_imcp_invoke_name);
1305 m->set_signature_index(_imcp_invoke_signature);
1306 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1307 assert(m->signature() == signature, "");
1308 ResultTypeFinder rtf(signature);
1309 m->constMethod()->set_result_type(rtf.type());
1310 m->compute_size_of_parameters(THREAD);
1311 m->init_intrinsic_id();
1312 assert(m->is_method_handle_intrinsic(), "");
1313 #ifdef ASSERT
1314 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1315 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1316 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1317 #endif //ASSERT
1318
1319 // Finally, set up its entry points.
1320 assert(m->can_be_statically_bound(), "");
1321 m->set_vtable_index(Method::nonvirtual_vtable_index);
1322 m->link_method(m, CHECK_(empty));
1323
1324 if (TraceMethodHandles && (Verbose || WizardMode)) {
1325 ttyLocker ttyl;
1326 m->print_on(tty);
1327 }
1328
1329 return m;
1330 }
1331
1332 Klass* Method::check_non_bcp_klass(Klass* klass) {
1333 if (klass != NULL && klass->class_loader() != NULL) {
1334 if (klass->is_objArray_klass())
1335 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1336 return klass;
1337 }
1338 return NULL;
1339 }
1340
1341
1342 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1343 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1344 // Code below does not work for native methods - they should never get rewritten anyway
1345 assert(!m->is_native(), "cannot rewrite native methods");
1346 // Allocate new Method*
1347 AccessFlags flags = m->access_flags();
1348
1349 ConstMethod* cm = m->constMethod();
1350 int checked_exceptions_len = cm->checked_exceptions_length();
1351 int localvariable_len = cm->localvariable_table_length();
1352 int exception_table_len = cm->exception_table_length();
1353 int method_parameters_len = cm->method_parameters_length();
1354 int method_annotations_len = cm->method_annotations_length();
1355 int parameter_annotations_len = cm->parameter_annotations_length();
1356 int type_annotations_len = cm->type_annotations_length();
1357 int default_annotations_len = cm->default_annotations_length();
1358
1359 InlineTableSizes sizes(
1360 localvariable_len,
1361 new_compressed_linenumber_size,
1362 exception_table_len,
1363 checked_exceptions_len,
1364 method_parameters_len,
1365 cm->generic_signature_index(),
1366 method_annotations_len,
1367 parameter_annotations_len,
1368 type_annotations_len,
1369 default_annotations_len,
1370 0);
1371
1372 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1373 Method* newm_oop = Method::allocate(loader_data,
1374 new_code_length,
1375 flags,
1376 &sizes,
1377 m->method_type(),
1378 CHECK_(methodHandle()));
1379 methodHandle newm (THREAD, newm_oop);
1380
1381 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1382 ConstMethod* newcm = newm->constMethod();
1383 int new_const_method_size = newm->constMethod()->size();
1384
1385 // This works because the source and target are both Methods. Some compilers
1386 // (e.g., clang) complain that the target vtable pointer will be stomped,
1387 // so cast away newm()'s and m()'s Methodness.
1388 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1389
1390 // Create shallow copy of ConstMethod.
1391 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1392
1393 // Reset correct method/const method, method size, and parameter info
1394 newm->set_constMethod(newcm);
1395 newm->constMethod()->set_code_size(new_code_length);
1396 newm->constMethod()->set_constMethod_size(new_const_method_size);
1397 assert(newm->code_size() == new_code_length, "check");
1398 assert(newm->method_parameters_length() == method_parameters_len, "check");
1399 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1400 assert(newm->exception_table_length() == exception_table_len, "check");
1401 assert(newm->localvariable_table_length() == localvariable_len, "check");
1402 // Copy new byte codes
1403 memcpy(newm->code_base(), new_code, new_code_length);
1404 // Copy line number table
1405 if (new_compressed_linenumber_size > 0) {
1406 memcpy(newm->compressed_linenumber_table(),
1407 new_compressed_linenumber_table,
1408 new_compressed_linenumber_size);
1409 }
1410 // Copy method_parameters
1411 if (method_parameters_len > 0) {
1412 memcpy(newm->method_parameters_start(),
1413 m->method_parameters_start(),
1414 method_parameters_len * sizeof(MethodParametersElement));
1415 }
1416 // Copy checked_exceptions
1417 if (checked_exceptions_len > 0) {
1418 memcpy(newm->checked_exceptions_start(),
1419 m->checked_exceptions_start(),
1420 checked_exceptions_len * sizeof(CheckedExceptionElement));
1421 }
1422 // Copy exception table
1423 if (exception_table_len > 0) {
1424 memcpy(newm->exception_table_start(),
1425 m->exception_table_start(),
1426 exception_table_len * sizeof(ExceptionTableElement));
1427 }
1428 // Copy local variable number table
1429 if (localvariable_len > 0) {
1430 memcpy(newm->localvariable_table_start(),
1431 m->localvariable_table_start(),
1432 localvariable_len * sizeof(LocalVariableTableElement));
1433 }
1434 // Copy stackmap table
1435 if (m->has_stackmap_table()) {
1436 int code_attribute_length = m->stackmap_data()->length();
1437 Array<u1>* stackmap_data =
1438 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1439 memcpy((void*)stackmap_data->adr_at(0),
1440 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1441 newm->set_stackmap_data(stackmap_data);
1442 }
1443
1444 // copy annotations over to new method
1445 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL);
1446 return newm;
1447 }
1448
1449 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) {
1450 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1451 // because we are not loading from core libraries
1452 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1453 // which does not use the class default class loader so we check for its loader here
1454 const InstanceKlass* ik = InstanceKlass::cast(holder);
1455 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1456 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1457 }
1458
1459 // see if the klass name is well-known:
1460 Symbol* klass_name = ik->name();
1461 return vmSymbols::find_sid(klass_name);
1462 }
1463
1464 void Method::init_intrinsic_id() {
1465 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1466 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1467 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1468 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1469
1470 // the klass name is well-known:
1471 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1472 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1473
1474 // ditto for method and signature:
1475 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1476 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1477 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1478 && name_id == vmSymbols::NO_SID) {
1479 return;
1480 }
1481 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1482 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1483 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1484 && sig_id == vmSymbols::NO_SID) {
1485 return;
1486 }
1487 jshort flags = access_flags().as_short();
1488
1489 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1490 if (id != vmIntrinsics::_none) {
1491 set_intrinsic_id(id);
1492 if (id == vmIntrinsics::_Class_cast) {
1493 // Even if the intrinsic is rejected, we want to inline this simple method.
1494 set_force_inline(true);
1495 }
1496 return;
1497 }
1498
1499 // A few slightly irregular cases:
1500 switch (klass_id) {
1501 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1502 // Second chance: check in regular Math.
1503 switch (name_id) {
1504 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1505 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1506 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1507 // pretend it is the corresponding method in the non-strict class:
1508 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1509 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1510 break;
1511 default:
1512 break;
1513 }
1514 break;
1515
1516 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1517 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1518 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1519 if (!is_native()) break;
1520 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1521 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1522 id = vmIntrinsics::_none;
1523 break;
1524
1525 default:
1526 break;
1527 }
1528
1529 if (id != vmIntrinsics::_none) {
1530 // Set up its iid. It is an alias method.
1531 set_intrinsic_id(id);
1532 return;
1533 }
1534 }
1535
1536 // These two methods are static since a GC may move the Method
1537 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1538 if (!THREAD->can_call_java()) {
1539 // There is nothing useful this routine can do from within the Compile thread.
1540 // Hopefully, the signature contains only well-known classes.
1541 // We could scan for this and return true/false, but the caller won't care.
1542 return false;
1543 }
1544 bool sig_is_loaded = true;
1545 Handle class_loader(THREAD, m->method_holder()->class_loader());
1546 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1547 ResourceMark rm(THREAD);
1548 Symbol* signature = m->signature();
1549 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1550 if (ss.is_object()) {
1551 Symbol* sym = ss.as_symbol(CHECK_(false));
1552 Symbol* name = sym;
1553 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1554 protection_domain, THREAD);
1555 // We are loading classes eagerly. If a ClassNotFoundException or
1556 // a LinkageError was generated, be sure to ignore it.
1557 if (HAS_PENDING_EXCEPTION) {
1558 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1559 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1560 CLEAR_PENDING_EXCEPTION;
1561 } else {
1562 return false;
1563 }
1564 }
1565 if( klass == NULL) { sig_is_loaded = false; }
1566 }
1567 }
1568 return sig_is_loaded;
1569 }
1570
1571 bool Method::has_unloaded_classes_in_signature(const methodHandle& m, TRAPS) {
1572 Handle class_loader(THREAD, m->method_holder()->class_loader());
1573 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1574 ResourceMark rm(THREAD);
1575 Symbol* signature = m->signature();
1576 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1577 if (ss.type() == T_OBJECT) {
1578 Symbol* name = ss.as_symbol_or_null();
1579 if (name == NULL) return true;
1580 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1581 if (klass == NULL) return true;
1582 }
1583 }
1584 return false;
1585 }
1586
1587 // Exposed so field engineers can debug VM
1588 void Method::print_short_name(outputStream* st) {
1589 ResourceMark rm;
1590 #ifdef PRODUCT
1591 st->print(" %s::", method_holder()->external_name());
1592 #else
1593 st->print(" %s::", method_holder()->internal_name());
1594 #endif
1595 name()->print_symbol_on(st);
1596 if (WizardMode) signature()->print_symbol_on(st);
1597 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1598 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1599 }
1600
1601 // Comparer for sorting an object array containing
1602 // Method*s.
1603 static int method_comparator(Method* a, Method* b) {
1604 return a->name()->fast_compare(b->name());
1605 }
1606
1607 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1608 // default_methods also uses this without the ordering for fast find_method
1609 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1610 int length = methods->length();
1611 if (length > 1) {
1612 {
1613 NoSafepointVerifier nsv;
1614 QuickSort::sort(methods->data(), length, method_comparator, idempotent);
1615 }
1616 // Reset method ordering
1617 if (set_idnums) {
1618 for (int i = 0; i < length; i++) {
1619 Method* m = methods->at(i);
1620 m->set_method_idnum(i);
1621 m->set_orig_method_idnum(i);
1622 }
1623 }
1624 }
1625 }
1626
1627 //-----------------------------------------------------------------------------------
1628 // Non-product code unless JVM/TI needs it
1629
1630 #if !defined(PRODUCT) || INCLUDE_JVMTI
1631 class SignatureTypePrinter : public SignatureTypeNames {
1632 private:
1633 outputStream* _st;
1634 bool _use_separator;
1635
1636 void type_name(const char* name) {
1637 if (_use_separator) _st->print(", ");
1638 _st->print("%s", name);
1639 _use_separator = true;
1640 }
1641
1642 public:
1643 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1644 _st = st;
1645 _use_separator = false;
1646 }
1647
1648 void print_parameters() { _use_separator = false; iterate_parameters(); }
1649 void print_returntype() { _use_separator = false; iterate_returntype(); }
1650 };
1651
1652
1653 void Method::print_name(outputStream* st) {
1654 Thread *thread = Thread::current();
1655 ResourceMark rm(thread);
1656 st->print("%s ", is_static() ? "static" : "virtual");
1657 if (WizardMode) {
1658 st->print("%s.", method_holder()->internal_name());
1659 name()->print_symbol_on(st);
1660 signature()->print_symbol_on(st);
1661 } else {
1662 SignatureTypePrinter sig(signature(), st);
1663 sig.print_returntype();
1664 st->print(" %s.", method_holder()->internal_name());
1665 name()->print_symbol_on(st);
1666 st->print("(");
1667 sig.print_parameters();
1668 st->print(")");
1669 }
1670 }
1671 #endif // !PRODUCT || INCLUDE_JVMTI
1672
1673
1674 void Method::print_codes_on(outputStream* st) const {
1675 print_codes_on(0, code_size(), st);
1676 }
1677
1678 void Method::print_codes_on(int from, int to, outputStream* st) const {
1679 Thread *thread = Thread::current();
1680 ResourceMark rm(thread);
1681 methodHandle mh (thread, (Method*)this);
1682 BytecodeStream s(mh);
1683 s.set_interval(from, to);
1684 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1685 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1686 }
1687
1688
1689 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1690 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1691 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1692 // as end-of-stream terminator.
1693
1694 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1695 // bci and line number does not compress into single byte.
1696 // Write out escape character and use regular compression for bci and line number.
1697 write_byte((jubyte)0xFF);
1698 write_signed_int(bci_delta);
1699 write_signed_int(line_delta);
1700 }
1701
1702 // See comment in method.hpp which explains why this exists.
1703 #if defined(_M_AMD64) && _MSC_VER >= 1400
1704 #pragma optimize("", off)
1705 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1706 write_pair_inline(bci, line);
1707 }
1708 #pragma optimize("", on)
1709 #endif
1710
1711 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1712 _bci = 0;
1713 _line = 0;
1714 };
1715
1716
1717 bool CompressedLineNumberReadStream::read_pair() {
1718 jubyte next = read_byte();
1719 // Check for terminator
1720 if (next == 0) return false;
1721 if (next == 0xFF) {
1722 // Escape character, regular compression used
1723 _bci += read_signed_int();
1724 _line += read_signed_int();
1725 } else {
1726 // Single byte compression used
1727 _bci += next >> 3;
1728 _line += next & 0x7;
1729 }
1730 return true;
1731 }
1732
1733 #if INCLUDE_JVMTI
1734
1735 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1736 BreakpointInfo* bp = method_holder()->breakpoints();
1737 for (; bp != NULL; bp = bp->next()) {
1738 if (bp->match(this, bci)) {
1739 return bp->orig_bytecode();
1740 }
1741 }
1742 {
1743 ResourceMark rm;
1744 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1745 }
1746 return Bytecodes::_shouldnotreachhere;
1747 }
1748
1749 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1750 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1751 BreakpointInfo* bp = method_holder()->breakpoints();
1752 for (; bp != NULL; bp = bp->next()) {
1753 if (bp->match(this, bci)) {
1754 bp->set_orig_bytecode(code);
1755 // and continue, in case there is more than one
1756 }
1757 }
1758 }
1759
1760 void Method::set_breakpoint(int bci) {
1761 InstanceKlass* ik = method_holder();
1762 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1763 bp->set_next(ik->breakpoints());
1764 ik->set_breakpoints(bp);
1765 // do this last:
1766 bp->set(this);
1767 }
1768
1769 static void clear_matches(Method* m, int bci) {
1770 InstanceKlass* ik = m->method_holder();
1771 BreakpointInfo* prev_bp = NULL;
1772 BreakpointInfo* next_bp;
1773 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1774 next_bp = bp->next();
1775 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1776 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1777 // do this first:
1778 bp->clear(m);
1779 // unhook it
1780 if (prev_bp != NULL)
1781 prev_bp->set_next(next_bp);
1782 else
1783 ik->set_breakpoints(next_bp);
1784 delete bp;
1785 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1786 // at same location. So we have multiple matching (method_index and bci)
1787 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1788 // breakpoint for clear_breakpoint request and keep all other method versions
1789 // BreakpointInfo for future clear_breakpoint request.
1790 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1791 // which is being called when class is unloaded. We delete all the Breakpoint
1792 // information for all versions of method. We may not correctly restore the original
1793 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1794 // so these methods won't be used anymore.
1795 if (bci >= 0) {
1796 break;
1797 }
1798 } else {
1799 // This one is a keeper.
1800 prev_bp = bp;
1801 }
1802 }
1803 }
1804
1805 void Method::clear_breakpoint(int bci) {
1806 assert(bci >= 0, "");
1807 clear_matches(this, bci);
1808 }
1809
1810 void Method::clear_all_breakpoints() {
1811 clear_matches(this, -1);
1812 }
1813
1814 #endif // INCLUDE_JVMTI
1815
1816 int Method::invocation_count() {
1817 MethodCounters *mcs = method_counters();
1818 if (TieredCompilation) {
1819 MethodData* const mdo = method_data();
1820 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1821 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1822 return InvocationCounter::count_limit;
1823 } else {
1824 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1825 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1826 }
1827 } else {
1828 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1829 }
1830 }
1831
1832 int Method::backedge_count() {
1833 MethodCounters *mcs = method_counters();
1834 if (TieredCompilation) {
1835 MethodData* const mdo = method_data();
1836 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1837 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1838 return InvocationCounter::count_limit;
1839 } else {
1840 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1841 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1842 }
1843 } else {
1844 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1845 }
1846 }
1847
1848 int Method::highest_comp_level() const {
1849 const MethodCounters* mcs = method_counters();
1850 if (mcs != NULL) {
1851 return mcs->highest_comp_level();
1852 } else {
1853 return CompLevel_none;
1854 }
1855 }
1856
1857 int Method::highest_osr_comp_level() const {
1858 const MethodCounters* mcs = method_counters();
1859 if (mcs != NULL) {
1860 return mcs->highest_osr_comp_level();
1861 } else {
1862 return CompLevel_none;
1863 }
1864 }
1865
1866 void Method::set_highest_comp_level(int level) {
1867 MethodCounters* mcs = method_counters();
1868 if (mcs != NULL) {
1869 mcs->set_highest_comp_level(level);
1870 }
1871 }
1872
1873 void Method::set_highest_osr_comp_level(int level) {
1874 MethodCounters* mcs = method_counters();
1875 if (mcs != NULL) {
1876 mcs->set_highest_osr_comp_level(level);
1877 }
1878 }
1879
1880 #if INCLUDE_JVMTI
1881
1882 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1883 _bci = bci;
1884 _name_index = m->name_index();
1885 _signature_index = m->signature_index();
1886 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1887 if (_orig_bytecode == Bytecodes::_breakpoint)
1888 _orig_bytecode = m->orig_bytecode_at(_bci);
1889 _next = NULL;
1890 }
1891
1892 void BreakpointInfo::set(Method* method) {
1893 #ifdef ASSERT
1894 {
1895 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1896 if (code == Bytecodes::_breakpoint)
1897 code = method->orig_bytecode_at(_bci);
1898 assert(orig_bytecode() == code, "original bytecode must be the same");
1899 }
1900 #endif
1901 Thread *thread = Thread::current();
1902 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1903 method->incr_number_of_breakpoints(thread);
1904 SystemDictionary::notice_modification();
1905 {
1906 // Deoptimize all dependents on this method
1907 HandleMark hm(thread);
1908 methodHandle mh(thread, method);
1909 CodeCache::flush_dependents_on_method(mh);
1910 }
1911 }
1912
1913 void BreakpointInfo::clear(Method* method) {
1914 *method->bcp_from(_bci) = orig_bytecode();
1915 assert(method->number_of_breakpoints() > 0, "must not go negative");
1916 method->decr_number_of_breakpoints(Thread::current());
1917 }
1918
1919 #endif // INCLUDE_JVMTI
1920
1921 // jmethodID handling
1922
1923 // This is a block allocating object, sort of like JNIHandleBlock, only a
1924 // lot simpler.
1925 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1926 // never get rid of it.
1927
1928 static const int min_block_size = 8;
1929
1930 class JNIMethodBlockNode : public CHeapObj<mtClass> {
1931 friend class JNIMethodBlock;
1932 Method** _methods;
1933 int _number_of_methods;
1934 int _top;
1935 JNIMethodBlockNode* _next;
1936
1937 public:
1938
1939 JNIMethodBlockNode(int num_methods = min_block_size);
1940
1941 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
1942
1943 void ensure_methods(int num_addl_methods) {
1944 if (_top < _number_of_methods) {
1945 num_addl_methods -= _number_of_methods - _top;
1946 if (num_addl_methods <= 0) {
1947 return;
1948 }
1949 }
1950 if (_next == NULL) {
1951 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
1952 } else {
1953 _next->ensure_methods(num_addl_methods);
1954 }
1955 }
1956 };
1957
1958 class JNIMethodBlock : public CHeapObj<mtClass> {
1959 JNIMethodBlockNode _head;
1960 JNIMethodBlockNode *_last_free;
1961 public:
1962 static Method* const _free_method;
1963
1964 JNIMethodBlock(int initial_capacity = min_block_size)
1965 : _head(initial_capacity), _last_free(&_head) {}
1966
1967 void ensure_methods(int num_addl_methods) {
1968 _last_free->ensure_methods(num_addl_methods);
1969 }
1970
1971 Method** add_method(Method* m) {
1972 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) {
1973 if (b->_top < b->_number_of_methods) {
1974 // top points to the next free entry.
1975 int i = b->_top;
1976 b->_methods[i] = m;
1977 b->_top++;
1978 _last_free = b;
1979 return &(b->_methods[i]);
1980 } else if (b->_top == b->_number_of_methods) {
1981 // if the next free entry ran off the block see if there's a free entry
1982 for (int i = 0; i < b->_number_of_methods; i++) {
1983 if (b->_methods[i] == _free_method) {
1984 b->_methods[i] = m;
1985 _last_free = b;
1986 return &(b->_methods[i]);
1987 }
1988 }
1989 // Only check each block once for frees. They're very unlikely.
1990 // Increment top past the end of the block.
1991 b->_top++;
1992 }
1993 // need to allocate a next block.
1994 if (b->_next == NULL) {
1995 b->_next = _last_free = new JNIMethodBlockNode();
1996 }
1997 }
1998 guarantee(false, "Should always allocate a free block");
1999 return NULL;
2000 }
2001
2002 bool contains(Method** m) {
2003 if (m == NULL) return false;
2004 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2005 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2006 // This is a bit of extra checking, for two reasons. One is
2007 // that contains() deals with pointers that are passed in by
2008 // JNI code, so making sure that the pointer is aligned
2009 // correctly is valuable. The other is that <= and > are
2010 // technically not defined on pointers, so the if guard can
2011 // pass spuriously; no modern compiler is likely to make that
2012 // a problem, though (and if one did, the guard could also
2013 // fail spuriously, which would be bad).
2014 ptrdiff_t idx = m - b->_methods;
2015 if (b->_methods + idx == m) {
2016 return true;
2017 }
2018 }
2019 }
2020 return false; // not found
2021 }
2022
2023 // Doesn't really destroy it, just marks it as free so it can be reused.
2024 void destroy_method(Method** m) {
2025 #ifdef ASSERT
2026 assert(contains(m), "should be a methodID");
2027 #endif // ASSERT
2028 *m = _free_method;
2029 }
2030
2031 // During class unloading the methods are cleared, which is different
2032 // than freed.
2033 void clear_all_methods() {
2034 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2035 for (int i = 0; i< b->_number_of_methods; i++) {
2036 b->_methods[i] = NULL;
2037 }
2038 }
2039 }
2040 #ifndef PRODUCT
2041 int count_methods() {
2042 // count all allocated methods
2043 int count = 0;
2044 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2045 for (int i = 0; i< b->_number_of_methods; i++) {
2046 if (b->_methods[i] != _free_method) count++;
2047 }
2048 }
2049 return count;
2050 }
2051 #endif // PRODUCT
2052 };
2053
2054 // Something that can't be mistaken for an address or a markOop
2055 Method* const JNIMethodBlock::_free_method = (Method*)55;
2056
2057 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) {
2058 _number_of_methods = MAX2(num_methods, min_block_size);
2059 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2060 for (int i = 0; i < _number_of_methods; i++) {
2061 _methods[i] = JNIMethodBlock::_free_method;
2062 }
2063 }
2064
2065 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
2066 ClassLoaderData* cld = loader_data;
2067 if (!SafepointSynchronize::is_at_safepoint()) {
2068 // Have to add jmethod_ids() to class loader data thread-safely.
2069 // Also have to add the method to the list safely, which the cld lock
2070 // protects as well.
2071 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2072 if (cld->jmethod_ids() == NULL) {
2073 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2074 } else {
2075 cld->jmethod_ids()->ensure_methods(capacity);
2076 }
2077 } else {
2078 // At safepoint, we are single threaded and can set this.
2079 if (cld->jmethod_ids() == NULL) {
2080 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2081 } else {
2082 cld->jmethod_ids()->ensure_methods(capacity);
2083 }
2084 }
2085 }
2086
2087 // Add a method id to the jmethod_ids
2088 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
2089 ClassLoaderData* cld = loader_data;
2090
2091 if (!SafepointSynchronize::is_at_safepoint()) {
2092 // Have to add jmethod_ids() to class loader data thread-safely.
2093 // Also have to add the method to the list safely, which the cld lock
2094 // protects as well.
2095 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2096 if (cld->jmethod_ids() == NULL) {
2097 cld->set_jmethod_ids(new JNIMethodBlock());
2098 }
2099 // jmethodID is a pointer to Method*
2100 return (jmethodID)cld->jmethod_ids()->add_method(m);
2101 } else {
2102 // At safepoint, we are single threaded and can set this.
2103 if (cld->jmethod_ids() == NULL) {
2104 cld->set_jmethod_ids(new JNIMethodBlock());
2105 }
2106 // jmethodID is a pointer to Method*
2107 return (jmethodID)cld->jmethod_ids()->add_method(m);
2108 }
2109 }
2110
2111 // Mark a jmethodID as free. This is called when there is a data race in
2112 // InstanceKlass while creating the jmethodID cache.
2113 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
2114 ClassLoaderData* cld = loader_data;
2115 Method** ptr = (Method**)m;
2116 assert(cld->jmethod_ids() != NULL, "should have method handles");
2117 cld->jmethod_ids()->destroy_method(ptr);
2118 }
2119
2120 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2121 // Can't assert the method_holder is the same because the new method has the
2122 // scratch method holder.
2123 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2124 == new_method->method_holder()->class_loader(),
2125 "changing to a different class loader");
2126 // Just change the method in place, jmethodID pointer doesn't change.
2127 *((Method**)jmid) = new_method;
2128 }
2129
2130 bool Method::is_method_id(jmethodID mid) {
2131 Method* m = resolve_jmethod_id(mid);
2132 assert(m != NULL, "should be called with non-null method");
2133 InstanceKlass* ik = m->method_holder();
2134 ClassLoaderData* cld = ik->class_loader_data();
2135 if (cld->jmethod_ids() == NULL) return false;
2136 return (cld->jmethod_ids()->contains((Method**)mid));
2137 }
2138
2139 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2140 if (mid == NULL) return NULL;
2141 Method* o = resolve_jmethod_id(mid);
2142 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
2143 return NULL;
2144 }
2145 return o;
2146 };
2147
2148 void Method::set_on_stack(const bool value) {
2149 // Set both the method itself and its constant pool. The constant pool
2150 // on stack means some method referring to it is also on the stack.
2151 constants()->set_on_stack(value);
2152
2153 bool already_set = on_stack();
2154 _access_flags.set_on_stack(value);
2155 if (value && !already_set) {
2156 MetadataOnStackMark::record(this);
2157 }
2158 }
2159
2160 // Called when the class loader is unloaded to make all methods weak.
2161 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2162 loader_data->jmethod_ids()->clear_all_methods();
2163 }
2164
2165 bool Method::has_method_vptr(const void* ptr) {
2166 Method m;
2167 // This assumes that the vtbl pointer is the first word of a C++ object.
2168 return dereference_vptr(&m) == dereference_vptr(ptr);
2169 }
2170
2171 // Check that this pointer is valid by checking that the vtbl pointer matches
2172 bool Method::is_valid_method() const {
2173 if (this == NULL) {
2174 return false;
2175 } else if ((intptr_t(this) & (wordSize-1)) != 0) {
2176 // Quick sanity check on pointer.
2177 return false;
2178 } else if (MetaspaceShared::is_in_shared_space(this)) {
2179 return MetaspaceShared::is_valid_shared_method(this);
2180 } else if (Metaspace::contains_non_shared(this)) {
2181 return has_method_vptr((const void*)this);
2182 } else {
2183 return false;
2184 }
2185 }
2186
2187 #ifndef PRODUCT
2188 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
2189 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
2190 }
2191 #endif // PRODUCT
2192
2193
2194 // Printing
2195
2196 #ifndef PRODUCT
2197
2198 void Method::print_on(outputStream* st) const {
2199 ResourceMark rm;
2200 assert(is_method(), "must be method");
2201 st->print_cr("%s", internal_name());
2202 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this));
2203 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2204 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants()));
2205 constants()->print_value_on(st); st->cr();
2206 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2207 st->print (" - name: "); name()->print_value_on(st); st->cr();
2208 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2209 st->print_cr(" - max stack: %d", max_stack());
2210 st->print_cr(" - max locals: %d", max_locals());
2211 st->print_cr(" - size of params: %d", size_of_parameters());
2212 st->print_cr(" - method size: %d", method_size());
2213 if (intrinsic_id() != vmIntrinsics::_none)
2214 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
2215 if (highest_comp_level() != CompLevel_none)
2216 st->print_cr(" - highest level: %d", highest_comp_level());
2217 st->print_cr(" - vtable index: %d", _vtable_index);
2218 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry()));
2219 st->print( " - adapters: ");
2220 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2221 if (a == NULL)
2222 st->print_cr(INTPTR_FORMAT, p2i(a));
2223 else
2224 a->print_adapter_on(st);
2225 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry()));
2226 st->print_cr(" - code size: %d", code_size());
2227 if (code_size() != 0) {
2228 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base()));
2229 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size()));
2230 }
2231 if (method_data() != NULL) {
2232 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data()));
2233 }
2234 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2235 if (checked_exceptions_length() > 0) {
2236 CheckedExceptionElement* table = checked_exceptions_start();
2237 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table));
2238 if (Verbose) {
2239 for (int i = 0; i < checked_exceptions_length(); i++) {
2240 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2241 }
2242 }
2243 }
2244 if (has_linenumber_table()) {
2245 u_char* table = compressed_linenumber_table();
2246 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table));
2247 if (Verbose) {
2248 CompressedLineNumberReadStream stream(table);
2249 while (stream.read_pair()) {
2250 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2251 }
2252 }
2253 }
2254 st->print_cr(" - localvar length: %d", localvariable_table_length());
2255 if (localvariable_table_length() > 0) {
2256 LocalVariableTableElement* table = localvariable_table_start();
2257 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table));
2258 if (Verbose) {
2259 for (int i = 0; i < localvariable_table_length(); i++) {
2260 int bci = table[i].start_bci;
2261 int len = table[i].length;
2262 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2263 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2264 int slot = table[i].slot;
2265 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2266 }
2267 }
2268 }
2269 if (code() != NULL) {
2270 st->print (" - compiled code: ");
2271 code()->print_value_on(st);
2272 }
2273 if (is_native()) {
2274 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function()));
2275 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler()));
2276 }
2277 }
2278
2279 void Method::print_linkage_flags(outputStream* st) {
2280 access_flags().print_on(st);
2281 if (is_default_method()) {
2282 st->print("default ");
2283 }
2284 if (is_overpass()) {
2285 st->print("overpass ");
2286 }
2287 }
2288 #endif //PRODUCT
2289
2290 void Method::print_value_on(outputStream* st) const {
2291 assert(is_method(), "must be method");
2292 st->print("%s", internal_name());
2293 print_address_on(st);
2294 st->print(" ");
2295 name()->print_value_on(st);
2296 st->print(" ");
2297 signature()->print_value_on(st);
2298 st->print(" in ");
2299 method_holder()->print_value_on(st);
2300 if (WizardMode) st->print("#%d", _vtable_index);
2301 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2302 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2303 }
2304
2305 #if INCLUDE_SERVICES
2306 // Size Statistics
2307 void Method::collect_statistics(KlassSizeStats *sz) const {
2308 int mysize = sz->count(this);
2309 sz->_method_bytes += mysize;
2310 sz->_method_all_bytes += mysize;
2311 sz->_rw_bytes += mysize;
2312
2313 if (constMethod()) {
2314 constMethod()->collect_statistics(sz);
2315 }
2316 if (method_data()) {
2317 method_data()->collect_statistics(sz);
2318 }
2319 }
2320 #endif // INCLUDE_SERVICES
2321
2322 // LogTouchedMethods and PrintTouchedMethods
2323
2324 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because
2325 // the Method may be garbage collected. Let's roll our own hash table.
2326 class TouchedMethodRecord : CHeapObj<mtTracing> {
2327 public:
2328 // It's OK to store Symbols here because they will NOT be GC'ed if
2329 // LogTouchedMethods is enabled.
2330 TouchedMethodRecord* _next;
2331 Symbol* _class_name;
2332 Symbol* _method_name;
2333 Symbol* _method_signature;
2334 };
2335
2336 static const int TOUCHED_METHOD_TABLE_SIZE = 20011;
2337 static TouchedMethodRecord** _touched_method_table = NULL;
2338
2339 void Method::log_touched(TRAPS) {
2340
2341 const int table_size = TOUCHED_METHOD_TABLE_SIZE;
2342 Symbol* my_class = klass_name();
2343 Symbol* my_name = name();
2344 Symbol* my_sig = signature();
2345
2346 unsigned int hash = my_class->identity_hash() +
2347 my_name->identity_hash() +
2348 my_sig->identity_hash();
2349 juint index = juint(hash) % table_size;
2350
2351 MutexLocker ml(TouchedMethodLog_lock, THREAD);
2352 if (_touched_method_table == NULL) {
2353 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size,
2354 mtTracing, CURRENT_PC);
2355 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size);
2356 }
2357
2358 TouchedMethodRecord* ptr = _touched_method_table[index];
2359 while (ptr) {
2360 if (ptr->_class_name == my_class &&
2361 ptr->_method_name == my_name &&
2362 ptr->_method_signature == my_sig) {
2363 return;
2364 }
2365 if (ptr->_next == NULL) break;
2366 ptr = ptr->_next;
2367 }
2368 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing);
2369 my_class->set_permanent(); // prevent reclaimed by GC
2370 my_name->set_permanent();
2371 my_sig->set_permanent();
2372 nptr->_class_name = my_class;
2373 nptr->_method_name = my_name;
2374 nptr->_method_signature = my_sig;
2375 nptr->_next = NULL;
2376
2377 if (ptr == NULL) {
2378 // first
2379 _touched_method_table[index] = nptr;
2380 } else {
2381 ptr->_next = nptr;
2382 }
2383 }
2384
2385 void Method::print_touched_methods(outputStream* out) {
2386 MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock);
2387 out->print_cr("# Method::print_touched_methods version 1");
2388 if (_touched_method_table) {
2389 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) {
2390 TouchedMethodRecord* ptr = _touched_method_table[i];
2391 while(ptr) {
2392 ptr->_class_name->print_symbol_on(out); out->print(".");
2393 ptr->_method_name->print_symbol_on(out); out->print(":");
2394 ptr->_method_signature->print_symbol_on(out); out->cr();
2395 ptr = ptr->_next;
2396 }
2397 }
2398 }
2399 }
2400
2401 // Verification
2402
2403 void Method::verify_on(outputStream* st) {
2404 guarantee(is_method(), "object must be method");
2405 guarantee(constants()->is_constantPool(), "should be constant pool");
2406 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2407 MethodData* md = method_data();
2408 guarantee(md == NULL ||
2409 md->is_methodData(), "should be method data");
2410 }