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