1 /*
2 * Copyright (c) 1997, 2019, 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/classLoaderDataGraph.hpp"
27 #include "classfile/metadataOnStackMark.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "code/codeCache.hpp"
30 #include "code/debugInfoRec.hpp"
31 #include "gc/shared/collectedHeap.inline.hpp"
32 #include "interpreter/bytecodeStream.hpp"
33 #include "interpreter/bytecodeTracer.hpp"
34 #include "interpreter/bytecodes.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "interpreter/oopMapCache.hpp"
37 #include "memory/allocation.inline.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 "memory/universe.hpp"
45 #include "oops/constMethod.hpp"
46 #include "oops/constantPool.hpp"
47 #include "oops/method.inline.hpp"
48 #include "oops/methodData.hpp"
49 #include "oops/objArrayKlass.hpp"
50 #include "oops/objArrayOop.inline.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "oops/symbol.hpp"
53 #include "prims/jvmtiExport.hpp"
54 #include "prims/methodHandles.hpp"
55 #include "prims/nativeLookup.hpp"
56 #include "runtime/arguments.hpp"
57 #include "runtime/compilationPolicy.hpp"
58 #include "runtime/frame.inline.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/init.hpp"
61 #include "runtime/orderAccess.hpp"
62 #include "runtime/relocator.hpp"
63 #include "runtime/safepointVerifiers.hpp"
64 #include "runtime/sharedRuntime.hpp"
65 #include "runtime/signature.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/quickSort.hpp"
68 #include "utilities/vmError.hpp"
69 #include "utilities/xmlstream.hpp"
70
71 // Implementation of Method
72
73 Method* Method::allocate(ClassLoaderData* loader_data,
74 int byte_code_size,
75 AccessFlags access_flags,
76 InlineTableSizes* sizes,
77 ConstMethod::MethodType method_type,
78 TRAPS) {
79 assert(!access_flags.is_native() || byte_code_size == 0,
80 "native methods should not contain byte codes");
81 ConstMethod* cm = ConstMethod::allocate(loader_data,
82 byte_code_size,
83 sizes,
84 method_type,
85 CHECK_NULL);
86 int size = Method::size(access_flags.is_native());
87 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags);
88 }
89
90 Method::Method(ConstMethod* xconst, AccessFlags access_flags) {
91 NoSafepointVerifier no_safepoint;
92 set_constMethod(xconst);
93 set_access_flags(access_flags);
94 set_intrinsic_id(vmIntrinsics::_none);
95 set_force_inline(false);
96 set_hidden(false);
97 set_dont_inline(false);
98 set_has_injected_profile(false);
99 set_method_data(NULL);
100 clear_method_counters();
101 set_vtable_index(Method::garbage_vtable_index);
102
103 // Fix and bury in Method*
104 set_interpreter_entry(NULL); // sets i2i entry and from_int
105 set_adapter_entry(NULL);
106 clear_code(false /* don't need a lock */); // from_c/from_i get set to c2i/i2i
107
108 if (access_flags.is_native()) {
109 clear_native_function();
110 set_signature_handler(NULL);
111 }
112
113 NOT_PRODUCT(set_compiled_invocation_count(0);)
114 }
115
116 // Release Method*. The nmethod will be gone when we get here because
117 // we've walked the code cache.
118 void Method::deallocate_contents(ClassLoaderData* loader_data) {
119 MetadataFactory::free_metadata(loader_data, constMethod());
120 set_constMethod(NULL);
121 #if INCLUDE_JVMCI
122 if (method_data()) {
123 FailedSpeculation::free_failed_speculations(method_data()->get_failed_speculations_address());
124 }
125 #endif
126 MetadataFactory::free_metadata(loader_data, method_data());
127 set_method_data(NULL);
128 MetadataFactory::free_metadata(loader_data, method_counters());
129 clear_method_counters();
130 // The nmethod will be gone when we get here.
131 if (code() != NULL) _code = NULL;
132 }
133
134 address Method::get_i2c_entry() {
135 assert(adapter() != NULL, "must have");
136 return adapter()->get_i2c_entry();
137 }
138
139 address Method::get_c2i_entry() {
140 assert(adapter() != NULL, "must have");
141 return adapter()->get_c2i_entry();
142 }
143
144 address Method::get_c2i_unverified_entry() {
145 assert(adapter() != NULL, "must have");
146 return adapter()->get_c2i_unverified_entry();
147 }
148
149 address Method::get_c2i_no_clinit_check_entry() {
150 assert(VM_Version::supports_fast_class_init_checks(), "");
151 assert(adapter() != NULL, "must have");
152 return adapter()->get_c2i_no_clinit_check_entry();
153 }
154
155 char* Method::name_and_sig_as_C_string() const {
156 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
157 }
158
159 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
160 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
161 }
162
163 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
164 const char* klass_name = klass->external_name();
165 int klass_name_len = (int)strlen(klass_name);
166 int method_name_len = method_name->utf8_length();
167 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
168 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
169 strcpy(dest, klass_name);
170 dest[klass_name_len] = '.';
171 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
172 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
173 dest[len] = 0;
174 return dest;
175 }
176
177 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
178 Symbol* klass_name = klass->name();
179 klass_name->as_klass_external_name(buf, size);
180 int len = (int)strlen(buf);
181
182 if (len < size - 1) {
183 buf[len++] = '.';
184
185 method_name->as_C_string(&(buf[len]), size - len);
186 len = (int)strlen(buf);
187
188 signature->as_C_string(&(buf[len]), size - len);
189 }
190
191 return buf;
192 }
193
194 const char* Method::external_name() const {
195 return external_name(constants()->pool_holder(), name(), signature());
196 }
197
198 void Method::print_external_name(outputStream *os) const {
199 print_external_name(os, constants()->pool_holder(), name(), signature());
200 }
201
202 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
203 stringStream ss;
204 print_external_name(&ss, klass, method_name, signature);
205 return ss.as_string();
206 }
207
208 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
209 signature->print_as_signature_external_return_type(os);
210 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
211 signature->print_as_signature_external_parameters(os);
212 os->print(")");
213 }
214
215 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
216 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
217 // access exception table
218 ExceptionTable table(mh());
219 int length = table.length();
220 // iterate through all entries sequentially
221 constantPoolHandle pool(THREAD, mh->constants());
222 for (int i = 0; i < length; i ++) {
223 //reacquire the table in case a GC happened
224 ExceptionTable table(mh());
225 int beg_bci = table.start_pc(i);
226 int end_bci = table.end_pc(i);
227 assert(beg_bci <= end_bci, "inconsistent exception table");
228 if (beg_bci <= throw_bci && throw_bci < end_bci) {
229 // exception handler bci range covers throw_bci => investigate further
230 int handler_bci = table.handler_pc(i);
231 int klass_index = table.catch_type_index(i);
232 if (klass_index == 0) {
233 return handler_bci;
234 } else if (ex_klass == NULL) {
235 return handler_bci;
236 } else {
237 // we know the exception class => get the constraint class
238 // this may require loading of the constraint class; if verification
239 // fails or some other exception occurs, return handler_bci
240 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
241 assert(k != NULL, "klass not loaded");
242 if (ex_klass->is_subtype_of(k)) {
243 return handler_bci;
244 }
245 }
246 }
247 }
248
249 return -1;
250 }
251
252 void Method::mask_for(int bci, InterpreterOopMap* mask) {
253 methodHandle h_this(Thread::current(), this);
254 // Only GC uses the OopMapCache during thread stack root scanning
255 // any other uses generate an oopmap but do not save it in the cache.
256 if (Universe::heap()->is_gc_active()) {
257 method_holder()->mask_for(h_this, bci, mask);
258 } else {
259 OopMapCache::compute_one_oop_map(h_this, bci, mask);
260 }
261 return;
262 }
263
264
265 int Method::bci_from(address bcp) const {
266 if (is_native() && bcp == 0) {
267 return 0;
268 }
269 #ifdef ASSERT
270 {
271 ResourceMark rm;
272 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(),
273 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s",
274 p2i(bcp), name_and_sig_as_C_string());
275 }
276 #endif
277 return bcp - code_base();
278 }
279
280
281 int Method::validate_bci(int bci) const {
282 return (bci == 0 || bci < code_size()) ? bci : -1;
283 }
284
285 // Return bci if it appears to be a valid bcp
286 // Return -1 otherwise.
287 // Used by profiling code, when invalid data is a possibility.
288 // The caller is responsible for validating the Method* itself.
289 int Method::validate_bci_from_bcp(address bcp) const {
290 // keep bci as -1 if not a valid bci
291 int bci = -1;
292 if (bcp == 0 || bcp == code_base()) {
293 // code_size() may return 0 and we allow 0 here
294 // the method may be native
295 bci = 0;
296 } else if (contains(bcp)) {
297 bci = bcp - code_base();
298 }
299 // Assert that if we have dodged any asserts, bci is negative.
300 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
301 return bci;
302 }
303
304 address Method::bcp_from(int bci) const {
305 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
306 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
307 address bcp = code_base() + bci;
308 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
309 return bcp;
310 }
311
312 address Method::bcp_from(address bcp) const {
313 if (is_native() && bcp == NULL) {
314 return code_base();
315 } else {
316 return bcp;
317 }
318 }
319
320 int Method::size(bool is_native) {
321 // If native, then include pointers for native_function and signature_handler
322 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
323 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
324 return align_metadata_size(header_size() + extra_words);
325 }
326
327
328 Symbol* Method::klass_name() const {
329 return method_holder()->name();
330 }
331
332
333 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
334 log_trace(cds)("Iter(Method): %p", this);
335
336 it->push(&_constMethod);
337 it->push(&_method_data);
338 it->push(&_method_counters);
339 }
340
341 // Attempt to return method oop to original state. Clear any pointers
342 // (to objects outside the shared spaces). We won't be able to predict
343 // where they should point in a new JVM. Further initialize some
344 // entries now in order allow them to be write protected later.
345
346 void Method::remove_unshareable_info() {
347 unlink_method();
348 }
349
350 void Method::set_vtable_index(int index) {
351 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
352 // At runtime initialize_vtable is rerun as part of link_class_impl()
353 // for a shared class loaded by the non-boot loader to obtain the loader
354 // constraints based on the runtime classloaders' context.
355 return; // don't write into the shared class
356 } else {
357 _vtable_index = index;
358 }
359 }
360
361 void Method::set_itable_index(int index) {
362 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
363 // At runtime initialize_itable is rerun as part of link_class_impl()
364 // for a shared class loaded by the non-boot loader to obtain the loader
365 // constraints based on the runtime classloaders' context. The dumptime
366 // itable index should be the same as the runtime index.
367 assert(_vtable_index == itable_index_max - index,
368 "archived itable index is different from runtime index");
369 return; // don’t write into the shared class
370 } else {
371 _vtable_index = itable_index_max - index;
372 }
373 assert(valid_itable_index(), "");
374 }
375
376
377
378 bool Method::was_executed_more_than(int n) {
379 // Invocation counter is reset when the Method* is compiled.
380 // If the method has compiled code we therefore assume it has
381 // be excuted more than n times.
382 if (is_accessor() || is_empty_method() || (code() != NULL)) {
383 // interpreter doesn't bump invocation counter of trivial methods
384 // compiler does not bump invocation counter of compiled methods
385 return true;
386 }
387 else if ((method_counters() != NULL &&
388 method_counters()->invocation_counter()->carry()) ||
389 (method_data() != NULL &&
390 method_data()->invocation_counter()->carry())) {
391 // The carry bit is set when the counter overflows and causes
392 // a compilation to occur. We don't know how many times
393 // the counter has been reset, so we simply assume it has
394 // been executed more than n times.
395 return true;
396 } else {
397 return invocation_count() > n;
398 }
399 }
400
401 void Method::print_invocation_count() {
402 if (is_static()) tty->print("static ");
403 if (is_final()) tty->print("final ");
404 if (is_synchronized()) tty->print("synchronized ");
405 if (is_native()) tty->print("native ");
406 tty->print("%s::", method_holder()->external_name());
407 name()->print_symbol_on(tty);
408 signature()->print_symbol_on(tty);
409
410 if (WizardMode) {
411 // dump the size of the byte codes
412 tty->print(" {%d}", code_size());
413 }
414 tty->cr();
415
416 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
417 tty->print_cr (" invocation_counter: %8d ", invocation_count());
418 tty->print_cr (" backedge_counter: %8d ", backedge_count());
419 #ifndef PRODUCT
420 if (CountCompiledCalls) {
421 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
422 }
423 #endif
424 }
425
426 // Build a MethodData* object to hold information about this method
427 // collected in the interpreter.
428 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) {
429 // Do not profile the method if metaspace has hit an OOM previously
430 // allocating profiling data. Callers clear pending exception so don't
431 // add one here.
432 if (ClassLoaderDataGraph::has_metaspace_oom()) {
433 return;
434 }
435
436 // Grab a lock here to prevent multiple
437 // MethodData*s from being created.
438 MutexLocker ml(MethodData_lock, THREAD);
439 if (method->method_data() == NULL) {
440 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
441 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
442 if (HAS_PENDING_EXCEPTION) {
443 CompileBroker::log_metaspace_failure();
444 ClassLoaderDataGraph::set_metaspace_oom(true);
445 return; // return the exception (which is cleared)
446 }
447
448 method->set_method_data(method_data);
449 if (PrintMethodData && (Verbose || WizardMode)) {
450 ResourceMark rm(THREAD);
451 tty->print("build_interpreter_method_data for ");
452 method->print_name(tty);
453 tty->cr();
454 // At the end of the run, the MDO, full of data, will be dumped.
455 }
456 }
457 }
458
459 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
460 // Do not profile the method if metaspace has hit an OOM previously
461 if (ClassLoaderDataGraph::has_metaspace_oom()) {
462 return NULL;
463 }
464
465 methodHandle mh(m);
466 MethodCounters* counters = MethodCounters::allocate(mh, THREAD);
467 if (HAS_PENDING_EXCEPTION) {
468 CompileBroker::log_metaspace_failure();
469 ClassLoaderDataGraph::set_metaspace_oom(true);
470 return NULL; // return the exception (which is cleared)
471 }
472 if (!mh->init_method_counters(counters)) {
473 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
474 }
475
476 if (LogTouchedMethods) {
477 mh->log_touched(CHECK_NULL);
478 }
479
480 return mh->method_counters();
481 }
482
483 bool Method::init_method_counters(MethodCounters* counters) {
484 // Try to install a pointer to MethodCounters, return true on success.
485 return Atomic::replace_if_null(counters, &_method_counters);
486 }
487
488 int Method::extra_stack_words() {
489 // not an inline function, to avoid a header dependency on Interpreter
490 return extra_stack_entries() * Interpreter::stackElementSize;
491 }
492
493
494 void Method::compute_size_of_parameters(Thread *thread) {
495 ArgumentSizeComputer asc(signature());
496 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
497 }
498
499 BasicType Method::result_type() const {
500 ResultTypeFinder rtf(signature());
501 return rtf.type();
502 }
503
504
505 bool Method::is_empty_method() const {
506 return code_size() == 1
507 && *code_base() == Bytecodes::_return;
508 }
509
510
511 bool Method::is_vanilla_constructor() const {
512 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
513 // which only calls the superclass vanilla constructor and possibly does stores of
514 // zero constants to local fields:
515 //
516 // aload_0
517 // invokespecial
518 // indexbyte1
519 // indexbyte2
520 //
521 // followed by an (optional) sequence of:
522 //
523 // aload_0
524 // aconst_null / iconst_0 / fconst_0 / dconst_0
525 // putfield
526 // indexbyte1
527 // indexbyte2
528 //
529 // followed by:
530 //
531 // return
532
533 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
534 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
535 int size = code_size();
536 // Check if size match
537 if (size == 0 || size % 5 != 0) return false;
538 address cb = code_base();
539 int last = size - 1;
540 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
541 // Does not call superclass default constructor
542 return false;
543 }
544 // Check optional sequence
545 for (int i = 4; i < last; i += 5) {
546 if (cb[i] != Bytecodes::_aload_0) return false;
547 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
548 if (cb[i+2] != Bytecodes::_putfield) return false;
549 }
550 return true;
551 }
552
553
554 bool Method::compute_has_loops_flag() {
555 BytecodeStream bcs(this);
556 Bytecodes::Code bc;
557
558 while ((bc = bcs.next()) >= 0) {
559 switch( bc ) {
560 case Bytecodes::_ifeq:
561 case Bytecodes::_ifnull:
562 case Bytecodes::_iflt:
563 case Bytecodes::_ifle:
564 case Bytecodes::_ifne:
565 case Bytecodes::_ifnonnull:
566 case Bytecodes::_ifgt:
567 case Bytecodes::_ifge:
568 case Bytecodes::_if_icmpeq:
569 case Bytecodes::_if_icmpne:
570 case Bytecodes::_if_icmplt:
571 case Bytecodes::_if_icmpgt:
572 case Bytecodes::_if_icmple:
573 case Bytecodes::_if_icmpge:
574 case Bytecodes::_if_acmpeq:
575 case Bytecodes::_if_acmpne:
576 case Bytecodes::_goto:
577 case Bytecodes::_jsr:
578 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
579 break;
580
581 case Bytecodes::_goto_w:
582 case Bytecodes::_jsr_w:
583 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
584 break;
585
586 default:
587 break;
588 }
589 }
590 _access_flags.set_loops_flag_init();
591 return _access_flags.has_loops();
592 }
593
594 bool Method::is_final_method(AccessFlags class_access_flags) const {
595 // or "does_not_require_vtable_entry"
596 // default method or overpass can occur, is not final (reuses vtable entry)
597 // private methods in classes get vtable entries for backward class compatibility.
598 if (is_overpass() || is_default_method()) return false;
599 return is_final() || class_access_flags.is_final();
600 }
601
602 bool Method::is_final_method() const {
603 return is_final_method(method_holder()->access_flags());
604 }
605
606 bool Method::is_default_method() const {
607 if (method_holder() != NULL &&
608 method_holder()->is_interface() &&
609 !is_abstract() && !is_private()) {
610 return true;
611 } else {
612 return false;
613 }
614 }
615
616 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
617 if (is_final_method(class_access_flags)) return true;
618 #ifdef ASSERT
619 ResourceMark rm;
620 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
621 if (class_access_flags.is_interface()) {
622 assert(is_nonv == is_static() || is_nonv == is_private(),
623 "nonvirtual unexpected for non-static, non-private: %s",
624 name_and_sig_as_C_string());
625 }
626 #endif
627 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
628 return vtable_index() == nonvirtual_vtable_index;
629 }
630
631 bool Method::can_be_statically_bound() const {
632 return can_be_statically_bound(method_holder()->access_flags());
633 }
634
635 bool Method::can_be_statically_bound(InstanceKlass* context) const {
636 return (method_holder() == context) && can_be_statically_bound();
637 }
638
639 bool Method::is_accessor() const {
640 return is_getter() || is_setter();
641 }
642
643 bool Method::is_getter() const {
644 if (code_size() != 5) return false;
645 if (size_of_parameters() != 1) return false;
646 if (java_code_at(0) != Bytecodes::_aload_0) return false;
647 if (java_code_at(1) != Bytecodes::_getfield) return false;
648 switch (java_code_at(4)) {
649 case Bytecodes::_ireturn:
650 case Bytecodes::_lreturn:
651 case Bytecodes::_freturn:
652 case Bytecodes::_dreturn:
653 case Bytecodes::_areturn:
654 break;
655 default:
656 return false;
657 }
658 return true;
659 }
660
661 bool Method::is_setter() const {
662 if (code_size() != 6) return false;
663 if (java_code_at(0) != Bytecodes::_aload_0) return false;
664 switch (java_code_at(1)) {
665 case Bytecodes::_iload_1:
666 case Bytecodes::_aload_1:
667 case Bytecodes::_fload_1:
668 if (size_of_parameters() != 2) return false;
669 break;
670 case Bytecodes::_dload_1:
671 case Bytecodes::_lload_1:
672 if (size_of_parameters() != 3) return false;
673 break;
674 default:
675 return false;
676 }
677 if (java_code_at(2) != Bytecodes::_putfield) return false;
678 if (java_code_at(5) != Bytecodes::_return) return false;
679 return true;
680 }
681
682 bool Method::is_constant_getter() const {
683 int last_index = code_size() - 1;
684 // Check if the first 1-3 bytecodes are a constant push
685 // and the last bytecode is a return.
686 return (2 <= code_size() && code_size() <= 4 &&
687 Bytecodes::is_const(java_code_at(0)) &&
688 Bytecodes::length_for(java_code_at(0)) == last_index &&
689 Bytecodes::is_return(java_code_at(last_index)));
690 }
691
692 bool Method::is_initializer() const {
693 return is_object_initializer() || is_static_initializer();
694 }
695
696 bool Method::has_valid_initializer_flags() const {
697 return (is_static() ||
698 method_holder()->major_version() < 51);
699 }
700
701 bool Method::is_static_initializer() const {
702 // For classfiles version 51 or greater, ensure that the clinit method is
703 // static. Non-static methods with the name "<clinit>" are not static
704 // initializers. (older classfiles exempted for backward compatibility)
705 return name() == vmSymbols::class_initializer_name() &&
706 has_valid_initializer_flags();
707 }
708
709 bool Method::is_object_initializer() const {
710 return name() == vmSymbols::object_initializer_name();
711 }
712
713 bool Method::needs_clinit_barrier() const {
714 return is_static() && !method_holder()->is_initialized();
715 }
716
717 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
718 int length = method->checked_exceptions_length();
719 if (length == 0) { // common case
720 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
721 } else {
722 methodHandle h_this(THREAD, method);
723 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
724 objArrayHandle mirrors (THREAD, m_oop);
725 for (int i = 0; i < length; i++) {
726 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
727 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
728 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
729 mirrors->obj_at_put(i, k->java_mirror());
730 }
731 return mirrors;
732 }
733 };
734
735
736 int Method::line_number_from_bci(int bci) const {
737 int best_bci = 0;
738 int best_line = -1;
739 if (bci == SynchronizationEntryBCI) bci = 0;
740 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
741 // The line numbers are a short array of 2-tuples [start_pc, line_number].
742 // Not necessarily sorted and not necessarily one-to-one.
743 CompressedLineNumberReadStream stream(compressed_linenumber_table());
744 while (stream.read_pair()) {
745 if (stream.bci() == bci) {
746 // perfect match
747 return stream.line();
748 } else {
749 // update best_bci/line
750 if (stream.bci() < bci && stream.bci() >= best_bci) {
751 best_bci = stream.bci();
752 best_line = stream.line();
753 }
754 }
755 }
756 }
757 return best_line;
758 }
759
760
761 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
762 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
763 Thread *thread = Thread::current();
764 Symbol* klass_name = constants()->klass_name_at(klass_index);
765 Handle loader(thread, method_holder()->class_loader());
766 Handle prot (thread, method_holder()->protection_domain());
767 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
768 } else {
769 return true;
770 }
771 }
772
773
774 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
775 int klass_index = constants()->klass_ref_index_at(refinfo_index);
776 if (must_be_resolved) {
777 // Make sure klass is resolved in constantpool.
778 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
779 }
780 return is_klass_loaded_by_klass_index(klass_index);
781 }
782
783
784 void Method::set_native_function(address function, bool post_event_flag) {
785 assert(function != NULL, "use clear_native_function to unregister natives");
786 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
787 address* native_function = native_function_addr();
788
789 // We can see racers trying to place the same native function into place. Once
790 // is plenty.
791 address current = *native_function;
792 if (current == function) return;
793 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
794 function != NULL) {
795 // native_method_throw_unsatisfied_link_error_entry() should only
796 // be passed when post_event_flag is false.
797 assert(function !=
798 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
799 "post_event_flag mis-match");
800
801 // post the bind event, and possible change the bind function
802 JvmtiExport::post_native_method_bind(this, &function);
803 }
804 *native_function = function;
805 // This function can be called more than once. We must make sure that we always
806 // use the latest registered method -> check if a stub already has been generated.
807 // If so, we have to make it not_entrant.
808 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
809 if (nm != NULL) {
810 nm->make_not_entrant();
811 }
812 }
813
814
815 bool Method::has_native_function() const {
816 if (is_method_handle_intrinsic())
817 return false; // special-cased in SharedRuntime::generate_native_wrapper
818 address func = native_function();
819 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
820 }
821
822
823 void Method::clear_native_function() {
824 // Note: is_method_handle_intrinsic() is allowed here.
825 set_native_function(
826 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
827 !native_bind_event_is_interesting);
828 clear_code();
829 }
830
831
832 void Method::set_signature_handler(address handler) {
833 address* signature_handler = signature_handler_addr();
834 *signature_handler = handler;
835 }
836
837
838 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
839 assert(reason != NULL, "must provide a reason");
840 if (PrintCompilation && report) {
841 ttyLocker ttyl;
842 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
843 if (comp_level == CompLevel_all) {
844 tty->print("all levels ");
845 } else {
846 tty->print("level %d ", comp_level);
847 }
848 this->print_short_name(tty);
849 int size = this->code_size();
850 if (size > 0) {
851 tty->print(" (%d bytes)", size);
852 }
853 if (reason != NULL) {
854 tty->print(" %s", reason);
855 }
856 tty->cr();
857 }
858 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
859 ttyLocker ttyl;
860 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
861 os::current_thread_id(), is_osr, comp_level);
862 if (reason != NULL) {
863 xtty->print(" reason=\'%s\'", reason);
864 }
865 xtty->method(this);
866 xtty->stamp();
867 xtty->end_elem();
868 }
869 }
870
871 bool Method::is_always_compilable() const {
872 // Generated adapters must be compiled
873 if (is_method_handle_intrinsic() && is_synthetic()) {
874 assert(!is_not_c1_compilable(), "sanity check");
875 assert(!is_not_c2_compilable(), "sanity check");
876 return true;
877 }
878
879 return false;
880 }
881
882 bool Method::is_not_compilable(int comp_level) const {
883 if (number_of_breakpoints() > 0)
884 return true;
885 if (is_always_compilable())
886 return false;
887 if (comp_level == CompLevel_any)
888 return is_not_c1_compilable() || is_not_c2_compilable();
889 if (is_c1_compile(comp_level))
890 return is_not_c1_compilable();
891 if (is_c2_compile(comp_level))
892 return is_not_c2_compilable();
893 return false;
894 }
895
896 // call this when compiler finds that this method is not compilable
897 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
898 if (is_always_compilable()) {
899 // Don't mark a method which should be always compilable
900 return;
901 }
902 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
903 if (comp_level == CompLevel_all) {
904 set_not_c1_compilable();
905 set_not_c2_compilable();
906 } else {
907 if (is_c1_compile(comp_level))
908 set_not_c1_compilable();
909 if (is_c2_compile(comp_level))
910 set_not_c2_compilable();
911 }
912 CompilationPolicy::policy()->disable_compilation(this);
913 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
914 }
915
916 bool Method::is_not_osr_compilable(int comp_level) const {
917 if (is_not_compilable(comp_level))
918 return true;
919 if (comp_level == CompLevel_any)
920 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
921 if (is_c1_compile(comp_level))
922 return is_not_c1_osr_compilable();
923 if (is_c2_compile(comp_level))
924 return is_not_c2_osr_compilable();
925 return false;
926 }
927
928 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
929 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
930 if (comp_level == CompLevel_all) {
931 set_not_c1_osr_compilable();
932 set_not_c2_osr_compilable();
933 } else {
934 if (is_c1_compile(comp_level))
935 set_not_c1_osr_compilable();
936 if (is_c2_compile(comp_level))
937 set_not_c2_osr_compilable();
938 }
939 CompilationPolicy::policy()->disable_compilation(this);
940 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
941 }
942
943 // Revert to using the interpreter and clear out the nmethod
944 void Method::clear_code(bool acquire_lock /* = true */) {
945 MutexLocker pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag);
946 // this may be NULL if c2i adapters have not been made yet
947 // Only should happen at allocate time.
948 if (adapter() == NULL) {
949 _from_compiled_entry = NULL;
950 } else {
951 _from_compiled_entry = adapter()->get_c2i_entry();
952 }
953 OrderAccess::storestore();
954 _from_interpreted_entry = _i2i_entry;
955 OrderAccess::storestore();
956 _code = NULL;
957 }
958
959 #if INCLUDE_CDS
960 // Called by class data sharing to remove any entry points (which are not shared)
961 void Method::unlink_method() {
962 _code = NULL;
963
964 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "dump time only");
965 // Set the values to what they should be at run time. Note that
966 // this Method can no longer be executed during dump time.
967 _i2i_entry = Interpreter::entry_for_cds_method(this);
968 _from_interpreted_entry = _i2i_entry;
969
970 if (DynamicDumpSharedSpaces) {
971 assert(_from_compiled_entry != NULL, "sanity");
972 } else {
973 // TODO: Simplify the adapter trampoline allocation for static archiving.
974 // Remove the use of CDSAdapterHandlerEntry.
975 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter();
976 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline());
977 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline();
978 assert(*((int*)_from_compiled_entry) == 0,
979 "must be NULL during dump time, to be initialized at run time");
980 }
981
982 if (is_native()) {
983 *native_function_addr() = NULL;
984 set_signature_handler(NULL);
985 }
986 NOT_PRODUCT(set_compiled_invocation_count(0);)
987
988 set_method_data(NULL);
989 clear_method_counters();
990 }
991 #endif
992
993 /****************************************************************************
994 // The following illustrates how the entries work for CDS shared Methods:
995 //
996 // Our goal is to delay writing into a shared Method until it's compiled.
997 // Hence, we want to determine the initial values for _i2i_entry,
998 // _from_interpreted_entry and _from_compiled_entry during CDS dump time.
999 //
1000 // In this example, both Methods A and B have the _i2i_entry of "zero_locals".
1001 // They also have similar signatures so that they will share the same
1002 // AdapterHandlerEntry.
1003 //
1004 // _adapter_trampoline points to a fixed location in the RW section of
1005 // the CDS archive. This location initially contains a NULL pointer. When the
1006 // first of method A or B is linked, an AdapterHandlerEntry is allocated
1007 // dynamically, and its c2i/i2c entries are generated.
1008 //
1009 // _i2i_entry and _from_interpreted_entry initially points to the same
1010 // (fixed) location in the CODE section of the CDS archive. This contains
1011 // an unconditional branch to the actual entry for "zero_locals", which is
1012 // generated at run time and may be on an arbitrary address. Thus, the
1013 // unconditional branch is also generated at run time to jump to the correct
1014 // address.
1015 //
1016 // Similarly, _from_compiled_entry points to a fixed address in the CODE
1017 // section. This address has enough space for an unconditional branch
1018 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is
1019 // initialized, and the address for the actual c2i_entry is known, we emit a
1020 // branch instruction here to branch to the actual c2i_entry.
1021 //
1022 // The effect of the extra branch on the i2i and c2i entries is negligible.
1023 //
1024 // The reason for putting _adapter_trampoline in RO is many shared Methods
1025 // share the same AdapterHandlerEntry, so we can save space in the RW section
1026 // by having the extra indirection.
1027
1028
1029 [Method A: RW]
1030 _constMethod ----> [ConstMethod: RO]
1031 _adapter_trampoline -----------+
1032 |
1033 _i2i_entry (same value as method B) |
1034 _from_interpreted_entry (same value as method B) |
1035 _from_compiled_entry (same value as method B) |
1036 |
1037 |
1038 [Method B: RW] +--------+
1039 _constMethod ----> [ConstMethod: RO] |
1040 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+
1041 |
1042 +-------------------------------+
1043 |
1044 +----> [AdapterHandlerEntry] (allocated at run time)
1045 _fingerprint
1046 _c2i_entry ---------------------------------+->[c2i entry..]
1047 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] |
1048 _from_interpreted_entry | _c2i_unverified_entry | |
1049 | | _c2i_no_clinit_check_entry| |
1050 | | (_cds_entry_table: CODE) | |
1051 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | |
1052 | | (allocated at run time) | |
1053 | | ... [asm code ...] | |
1054 +-[not compiled]-+ [n]: jmp _entry_table[n] | |
1055 | | |
1056 | | |
1057 +-[compiled]-------------------------------------------------------------------+ |
1058 |
1059 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) |
1060 [jmp c2i_entry] ------------------------------------------------------+
1061
1062 ***/
1063
1064 // Called when the method_holder is getting linked. Setup entrypoints so the method
1065 // is ready to be called from interpreter, compiler, and vtables.
1066 void Method::link_method(const methodHandle& h_method, TRAPS) {
1067 // If the code cache is full, we may reenter this function for the
1068 // leftover methods that weren't linked.
1069 if (is_shared()) {
1070 address entry = Interpreter::entry_for_cds_method(h_method);
1071 assert(entry != NULL && entry == _i2i_entry,
1072 "should be correctly set during dump time");
1073 if (adapter() != NULL) {
1074 return;
1075 }
1076 assert(entry == _from_interpreted_entry,
1077 "should be correctly set during dump time");
1078 } else if (_i2i_entry != NULL) {
1079 return;
1080 }
1081 assert( _code == NULL, "nothing compiled yet" );
1082
1083 // Setup interpreter entrypoint
1084 assert(this == h_method(), "wrong h_method()" );
1085
1086 if (!is_shared()) {
1087 assert(adapter() == NULL, "init'd to NULL");
1088 address entry = Interpreter::entry_for_method(h_method);
1089 assert(entry != NULL, "interpreter entry must be non-null");
1090 // Sets both _i2i_entry and _from_interpreted_entry
1091 set_interpreter_entry(entry);
1092 }
1093
1094 // Don't overwrite already registered native entries.
1095 if (is_native() && !has_native_function()) {
1096 set_native_function(
1097 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1098 !native_bind_event_is_interesting);
1099 }
1100
1101 // Setup compiler entrypoint. This is made eagerly, so we do not need
1102 // special handling of vtables. An alternative is to make adapters more
1103 // lazily by calling make_adapter() from from_compiled_entry() for the
1104 // normal calls. For vtable calls life gets more complicated. When a
1105 // call-site goes mega-morphic we need adapters in all methods which can be
1106 // called from the vtable. We need adapters on such methods that get loaded
1107 // later. Ditto for mega-morphic itable calls. If this proves to be a
1108 // problem we'll make these lazily later.
1109 (void) make_adapters(h_method, CHECK);
1110
1111 // ONLY USE the h_method now as make_adapter may have blocked
1112
1113 }
1114
1115 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1116 // Adapters for compiled code are made eagerly here. They are fairly
1117 // small (generally < 100 bytes) and quick to make (and cached and shared)
1118 // so making them eagerly shouldn't be too expensive.
1119 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1120 if (adapter == NULL ) {
1121 if (!is_init_completed()) {
1122 // Don't throw exceptions during VM initialization because java.lang.* classes
1123 // might not have been initialized, causing problems when constructing the
1124 // Java exception object.
1125 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1126 } else {
1127 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1128 }
1129 }
1130
1131 if (mh->is_shared()) {
1132 assert(mh->adapter() == adapter, "must be");
1133 assert(mh->_from_compiled_entry != NULL, "must be");
1134 } else {
1135 mh->set_adapter_entry(adapter);
1136 mh->_from_compiled_entry = adapter->get_c2i_entry();
1137 }
1138 return adapter->get_c2i_entry();
1139 }
1140
1141 void Method::restore_unshareable_info(TRAPS) {
1142 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
1143
1144 // Since restore_unshareable_info can be called more than once for a method, don't
1145 // redo any work.
1146 if (adapter() == NULL) {
1147 methodHandle mh(THREAD, this);
1148 link_method(mh, CHECK);
1149 }
1150 }
1151
1152 address Method::from_compiled_entry_no_trampoline() const {
1153 CompiledMethod *code = OrderAccess::load_acquire(&_code);
1154 if (code) {
1155 return code->verified_entry_point();
1156 } else {
1157 return adapter()->get_c2i_entry();
1158 }
1159 }
1160
1161 // The verified_code_entry() must be called when a invoke is resolved
1162 // on this method.
1163
1164 // It returns the compiled code entry point, after asserting not null.
1165 // This function is called after potential safepoints so that nmethod
1166 // or adapter that it points to is still live and valid.
1167 // This function must not hit a safepoint!
1168 address Method::verified_code_entry() {
1169 debug_only(NoSafepointVerifier nsv;)
1170 assert(_from_compiled_entry != NULL, "must be set");
1171 return _from_compiled_entry;
1172 }
1173
1174 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1175 // (could be racing a deopt).
1176 // Not inline to avoid circular ref.
1177 bool Method::check_code() const {
1178 // cached in a register or local. There's a race on the value of the field.
1179 CompiledMethod *code = OrderAccess::load_acquire(&_code);
1180 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1181 }
1182
1183 // Install compiled code. Instantly it can execute.
1184 void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
1185 MutexLocker pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1186 assert( code, "use clear_code to remove code" );
1187 assert( mh->check_code(), "" );
1188
1189 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1190
1191 // These writes must happen in this order, because the interpreter will
1192 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1193 // which jumps to _from_compiled_entry.
1194 mh->_code = code; // Assign before allowing compiled code to exec
1195
1196 int comp_level = code->comp_level();
1197 // In theory there could be a race here. In practice it is unlikely
1198 // and not worth worrying about.
1199 if (comp_level > mh->highest_comp_level()) {
1200 mh->set_highest_comp_level(comp_level);
1201 }
1202
1203 OrderAccess::storestore();
1204 mh->_from_compiled_entry = code->verified_entry_point();
1205 OrderAccess::storestore();
1206 // Instantly compiled code can execute.
1207 if (!mh->is_method_handle_intrinsic())
1208 mh->_from_interpreted_entry = mh->get_i2c_entry();
1209 }
1210
1211
1212 bool Method::is_overridden_in(Klass* k) const {
1213 InstanceKlass* ik = InstanceKlass::cast(k);
1214
1215 if (ik->is_interface()) return false;
1216
1217 // If method is an interface, we skip it - except if it
1218 // is a miranda method
1219 if (method_holder()->is_interface()) {
1220 // Check that method is not a miranda method
1221 if (ik->lookup_method(name(), signature()) == NULL) {
1222 // No implementation exist - so miranda method
1223 return false;
1224 }
1225 return true;
1226 }
1227
1228 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1229 if (!has_vtable_index()) {
1230 return false;
1231 } else {
1232 Method* vt_m = ik->method_at_vtable(vtable_index());
1233 return vt_m != this;
1234 }
1235 }
1236
1237
1238 // give advice about whether this Method* should be cached or not
1239 bool Method::should_not_be_cached() const {
1240 if (is_old()) {
1241 // This method has been redefined. It is either EMCP or obsolete
1242 // and we don't want to cache it because that would pin the method
1243 // down and prevent it from being collectible if and when it
1244 // finishes executing.
1245 return true;
1246 }
1247
1248 // caching this method should be just fine
1249 return false;
1250 }
1251
1252
1253 /**
1254 * Returns true if this is one of the specially treated methods for
1255 * security related stack walks (like Reflection.getCallerClass).
1256 */
1257 bool Method::is_ignored_by_security_stack_walk() const {
1258 if (intrinsic_id() == vmIntrinsics::_invoke) {
1259 // This is Method.invoke() -- ignore it
1260 return true;
1261 }
1262 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1263 // This is an auxilary frame -- ignore it
1264 return true;
1265 }
1266 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1267 // This is an internal adapter frame for method handles -- ignore it
1268 return true;
1269 }
1270 return false;
1271 }
1272
1273
1274 // Constant pool structure for invoke methods:
1275 enum {
1276 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1277 _imcp_invoke_signature, // utf8: (variable Symbol*)
1278 _imcp_limit
1279 };
1280
1281 // Test if this method is an MH adapter frame generated by Java code.
1282 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1283 bool Method::is_compiled_lambda_form() const {
1284 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1285 }
1286
1287 // Test if this method is an internal MH primitive method.
1288 bool Method::is_method_handle_intrinsic() const {
1289 vmIntrinsics::ID iid = intrinsic_id();
1290 return (MethodHandles::is_signature_polymorphic(iid) &&
1291 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1292 }
1293
1294 bool Method::has_member_arg() const {
1295 vmIntrinsics::ID iid = intrinsic_id();
1296 return (MethodHandles::is_signature_polymorphic(iid) &&
1297 MethodHandles::has_member_arg(iid));
1298 }
1299
1300 // Make an instance of a signature-polymorphic internal MH primitive.
1301 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1302 Symbol* signature,
1303 TRAPS) {
1304 ResourceMark rm;
1305 methodHandle empty;
1306
1307 InstanceKlass* holder = SystemDictionary::MethodHandle_klass();
1308 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1309 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1310 if (TraceMethodHandles) {
1311 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1312 }
1313
1314 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1315 name->increment_refcount();
1316 signature->increment_refcount();
1317
1318 int cp_length = _imcp_limit;
1319 ClassLoaderData* loader_data = holder->class_loader_data();
1320 constantPoolHandle cp;
1321 {
1322 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1323 cp = constantPoolHandle(THREAD, cp_oop);
1324 }
1325 cp->set_pool_holder(holder);
1326 cp->symbol_at_put(_imcp_invoke_name, name);
1327 cp->symbol_at_put(_imcp_invoke_signature, signature);
1328 cp->set_has_preresolution();
1329
1330 // decide on access bits: public or not?
1331 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1332 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1333 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1334 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1335
1336 methodHandle m;
1337 {
1338 InlineTableSizes sizes;
1339 Method* m_oop = Method::allocate(loader_data, 0,
1340 accessFlags_from(flags_bits), &sizes,
1341 ConstMethod::NORMAL, CHECK_(empty));
1342 m = methodHandle(THREAD, m_oop);
1343 }
1344 m->set_constants(cp());
1345 m->set_name_index(_imcp_invoke_name);
1346 m->set_signature_index(_imcp_invoke_signature);
1347 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1348 assert(m->signature() == signature, "");
1349 ResultTypeFinder rtf(signature);
1350 m->constMethod()->set_result_type(rtf.type());
1351 m->compute_size_of_parameters(THREAD);
1352 m->init_intrinsic_id();
1353 assert(m->is_method_handle_intrinsic(), "");
1354 #ifdef ASSERT
1355 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1356 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1357 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1358 #endif //ASSERT
1359
1360 // Finally, set up its entry points.
1361 assert(m->can_be_statically_bound(), "");
1362 m->set_vtable_index(Method::nonvirtual_vtable_index);
1363 m->link_method(m, CHECK_(empty));
1364
1365 if (TraceMethodHandles && (Verbose || WizardMode)) {
1366 ttyLocker ttyl;
1367 m->print_on(tty);
1368 }
1369
1370 return m;
1371 }
1372
1373 Klass* Method::check_non_bcp_klass(Klass* klass) {
1374 if (klass != NULL && klass->class_loader() != NULL) {
1375 if (klass->is_objArray_klass())
1376 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1377 return klass;
1378 }
1379 return NULL;
1380 }
1381
1382
1383 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1384 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1385 // Code below does not work for native methods - they should never get rewritten anyway
1386 assert(!m->is_native(), "cannot rewrite native methods");
1387 // Allocate new Method*
1388 AccessFlags flags = m->access_flags();
1389
1390 ConstMethod* cm = m->constMethod();
1391 int checked_exceptions_len = cm->checked_exceptions_length();
1392 int localvariable_len = cm->localvariable_table_length();
1393 int exception_table_len = cm->exception_table_length();
1394 int method_parameters_len = cm->method_parameters_length();
1395 int method_annotations_len = cm->method_annotations_length();
1396 int parameter_annotations_len = cm->parameter_annotations_length();
1397 int type_annotations_len = cm->type_annotations_length();
1398 int default_annotations_len = cm->default_annotations_length();
1399
1400 InlineTableSizes sizes(
1401 localvariable_len,
1402 new_compressed_linenumber_size,
1403 exception_table_len,
1404 checked_exceptions_len,
1405 method_parameters_len,
1406 cm->generic_signature_index(),
1407 method_annotations_len,
1408 parameter_annotations_len,
1409 type_annotations_len,
1410 default_annotations_len,
1411 0);
1412
1413 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1414 Method* newm_oop = Method::allocate(loader_data,
1415 new_code_length,
1416 flags,
1417 &sizes,
1418 m->method_type(),
1419 CHECK_(methodHandle()));
1420 methodHandle newm (THREAD, newm_oop);
1421
1422 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1423 ConstMethod* newcm = newm->constMethod();
1424 int new_const_method_size = newm->constMethod()->size();
1425
1426 // This works because the source and target are both Methods. Some compilers
1427 // (e.g., clang) complain that the target vtable pointer will be stomped,
1428 // so cast away newm()'s and m()'s Methodness.
1429 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1430
1431 // Create shallow copy of ConstMethod.
1432 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1433
1434 // Reset correct method/const method, method size, and parameter info
1435 newm->set_constMethod(newcm);
1436 newm->constMethod()->set_code_size(new_code_length);
1437 newm->constMethod()->set_constMethod_size(new_const_method_size);
1438 assert(newm->code_size() == new_code_length, "check");
1439 assert(newm->method_parameters_length() == method_parameters_len, "check");
1440 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1441 assert(newm->exception_table_length() == exception_table_len, "check");
1442 assert(newm->localvariable_table_length() == localvariable_len, "check");
1443 // Copy new byte codes
1444 memcpy(newm->code_base(), new_code, new_code_length);
1445 // Copy line number table
1446 if (new_compressed_linenumber_size > 0) {
1447 memcpy(newm->compressed_linenumber_table(),
1448 new_compressed_linenumber_table,
1449 new_compressed_linenumber_size);
1450 }
1451 // Copy method_parameters
1452 if (method_parameters_len > 0) {
1453 memcpy(newm->method_parameters_start(),
1454 m->method_parameters_start(),
1455 method_parameters_len * sizeof(MethodParametersElement));
1456 }
1457 // Copy checked_exceptions
1458 if (checked_exceptions_len > 0) {
1459 memcpy(newm->checked_exceptions_start(),
1460 m->checked_exceptions_start(),
1461 checked_exceptions_len * sizeof(CheckedExceptionElement));
1462 }
1463 // Copy exception table
1464 if (exception_table_len > 0) {
1465 memcpy(newm->exception_table_start(),
1466 m->exception_table_start(),
1467 exception_table_len * sizeof(ExceptionTableElement));
1468 }
1469 // Copy local variable number table
1470 if (localvariable_len > 0) {
1471 memcpy(newm->localvariable_table_start(),
1472 m->localvariable_table_start(),
1473 localvariable_len * sizeof(LocalVariableTableElement));
1474 }
1475 // Copy stackmap table
1476 if (m->has_stackmap_table()) {
1477 int code_attribute_length = m->stackmap_data()->length();
1478 Array<u1>* stackmap_data =
1479 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1480 memcpy((void*)stackmap_data->adr_at(0),
1481 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1482 newm->set_stackmap_data(stackmap_data);
1483 }
1484
1485 // copy annotations over to new method
1486 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL);
1487 return newm;
1488 }
1489
1490 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) {
1491 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1492 // because we are not loading from core libraries
1493 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1494 // which does not use the class default class loader so we check for its loader here
1495 const InstanceKlass* ik = InstanceKlass::cast(holder);
1496 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1497 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1498 }
1499
1500 // see if the klass name is well-known:
1501 Symbol* klass_name = ik->name();
1502 return vmSymbols::find_sid(klass_name);
1503 }
1504
1505 void Method::init_intrinsic_id() {
1506 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1507 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1508 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1509 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1510
1511 // the klass name is well-known:
1512 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1513 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1514
1515 // ditto for method and signature:
1516 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1517 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1518 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1519 && name_id == vmSymbols::NO_SID) {
1520 return;
1521 }
1522 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1523 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1524 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1525 && sig_id == vmSymbols::NO_SID) {
1526 return;
1527 }
1528 jshort flags = access_flags().as_short();
1529
1530 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1531 if (id != vmIntrinsics::_none) {
1532 set_intrinsic_id(id);
1533 if (id == vmIntrinsics::_Class_cast) {
1534 // Even if the intrinsic is rejected, we want to inline this simple method.
1535 set_force_inline(true);
1536 }
1537 return;
1538 }
1539
1540 // A few slightly irregular cases:
1541 switch (klass_id) {
1542 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1543 // Second chance: check in regular Math.
1544 switch (name_id) {
1545 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1546 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1547 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1548 // pretend it is the corresponding method in the non-strict class:
1549 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1550 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1551 break;
1552 default:
1553 break;
1554 }
1555 break;
1556
1557 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1558 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1559 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1560 if (!is_native()) break;
1561 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1562 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1563 id = vmIntrinsics::_none;
1564 break;
1565
1566 default:
1567 break;
1568 }
1569
1570 if (id != vmIntrinsics::_none) {
1571 // Set up its iid. It is an alias method.
1572 set_intrinsic_id(id);
1573 return;
1574 }
1575 }
1576
1577 // These two methods are static since a GC may move the Method
1578 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1579 if (!THREAD->can_call_java()) {
1580 // There is nothing useful this routine can do from within the Compile thread.
1581 // Hopefully, the signature contains only well-known classes.
1582 // We could scan for this and return true/false, but the caller won't care.
1583 return false;
1584 }
1585 bool sig_is_loaded = true;
1586 Handle class_loader(THREAD, m->method_holder()->class_loader());
1587 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1588 ResourceMark rm(THREAD);
1589 Symbol* signature = m->signature();
1590 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1591 if (ss.is_object()) {
1592 Symbol* sym = ss.as_symbol();
1593 Symbol* name = sym;
1594 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1595 protection_domain, THREAD);
1596 // We are loading classes eagerly. If a ClassNotFoundException or
1597 // a LinkageError was generated, be sure to ignore it.
1598 if (HAS_PENDING_EXCEPTION) {
1599 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1600 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1601 CLEAR_PENDING_EXCEPTION;
1602 } else {
1603 return false;
1604 }
1605 }
1606 if( klass == NULL) { sig_is_loaded = false; }
1607 }
1608 }
1609 return sig_is_loaded;
1610 }
1611
1612 bool Method::has_unloaded_classes_in_signature(const methodHandle& m, TRAPS) {
1613 Handle class_loader(THREAD, m->method_holder()->class_loader());
1614 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1615 ResourceMark rm(THREAD);
1616 Symbol* signature = m->signature();
1617 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1618 if (ss.type() == T_OBJECT) {
1619 Symbol* name = ss.as_symbol_or_null();
1620 if (name == NULL) return true;
1621 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1622 if (klass == NULL) return true;
1623 }
1624 }
1625 return false;
1626 }
1627
1628 // Exposed so field engineers can debug VM
1629 void Method::print_short_name(outputStream* st) {
1630 ResourceMark rm;
1631 #ifdef PRODUCT
1632 st->print(" %s::", method_holder()->external_name());
1633 #else
1634 st->print(" %s::", method_holder()->internal_name());
1635 #endif
1636 name()->print_symbol_on(st);
1637 if (WizardMode) signature()->print_symbol_on(st);
1638 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1639 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1640 }
1641
1642 // Comparer for sorting an object array containing
1643 // Method*s.
1644 static int method_comparator(Method* a, Method* b) {
1645 return a->name()->fast_compare(b->name());
1646 }
1647
1648 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1649 // default_methods also uses this without the ordering for fast find_method
1650 void Method::sort_methods(Array<Method*>* methods, bool set_idnums) {
1651 int length = methods->length();
1652 if (length > 1) {
1653 {
1654 NoSafepointVerifier nsv;
1655 QuickSort::sort(methods->data(), length, method_comparator, /*idempotent=*/false);
1656 }
1657 // Reset method ordering
1658 if (set_idnums) {
1659 for (int i = 0; i < length; i++) {
1660 Method* m = methods->at(i);
1661 m->set_method_idnum(i);
1662 m->set_orig_method_idnum(i);
1663 }
1664 }
1665 }
1666 }
1667
1668 //-----------------------------------------------------------------------------------
1669 // Non-product code unless JVM/TI needs it
1670
1671 #if !defined(PRODUCT) || INCLUDE_JVMTI
1672 class SignatureTypePrinter : public SignatureTypeNames {
1673 private:
1674 outputStream* _st;
1675 bool _use_separator;
1676
1677 void type_name(const char* name) {
1678 if (_use_separator) _st->print(", ");
1679 _st->print("%s", name);
1680 _use_separator = true;
1681 }
1682
1683 public:
1684 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1685 _st = st;
1686 _use_separator = false;
1687 }
1688
1689 void print_parameters() { _use_separator = false; iterate_parameters(); }
1690 void print_returntype() { _use_separator = false; iterate_returntype(); }
1691 };
1692
1693
1694 void Method::print_name(outputStream* st) {
1695 Thread *thread = Thread::current();
1696 ResourceMark rm(thread);
1697 st->print("%s ", is_static() ? "static" : "virtual");
1698 if (WizardMode) {
1699 st->print("%s.", method_holder()->internal_name());
1700 name()->print_symbol_on(st);
1701 signature()->print_symbol_on(st);
1702 } else {
1703 SignatureTypePrinter sig(signature(), st);
1704 sig.print_returntype();
1705 st->print(" %s.", method_holder()->internal_name());
1706 name()->print_symbol_on(st);
1707 st->print("(");
1708 sig.print_parameters();
1709 st->print(")");
1710 }
1711 }
1712 #endif // !PRODUCT || INCLUDE_JVMTI
1713
1714
1715 void Method::print_codes_on(outputStream* st) const {
1716 print_codes_on(0, code_size(), st);
1717 }
1718
1719 void Method::print_codes_on(int from, int to, outputStream* st) const {
1720 Thread *thread = Thread::current();
1721 ResourceMark rm(thread);
1722 methodHandle mh (thread, (Method*)this);
1723 BytecodeStream s(mh);
1724 s.set_interval(from, to);
1725 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1726 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1727 }
1728
1729 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1730 _bci = 0;
1731 _line = 0;
1732 };
1733
1734 bool CompressedLineNumberReadStream::read_pair() {
1735 jubyte next = read_byte();
1736 // Check for terminator
1737 if (next == 0) return false;
1738 if (next == 0xFF) {
1739 // Escape character, regular compression used
1740 _bci += read_signed_int();
1741 _line += read_signed_int();
1742 } else {
1743 // Single byte compression used
1744 _bci += next >> 3;
1745 _line += next & 0x7;
1746 }
1747 return true;
1748 }
1749
1750 #if INCLUDE_JVMTI
1751
1752 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1753 BreakpointInfo* bp = method_holder()->breakpoints();
1754 for (; bp != NULL; bp = bp->next()) {
1755 if (bp->match(this, bci)) {
1756 return bp->orig_bytecode();
1757 }
1758 }
1759 {
1760 ResourceMark rm;
1761 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1762 }
1763 return Bytecodes::_shouldnotreachhere;
1764 }
1765
1766 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1767 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1768 BreakpointInfo* bp = method_holder()->breakpoints();
1769 for (; bp != NULL; bp = bp->next()) {
1770 if (bp->match(this, bci)) {
1771 bp->set_orig_bytecode(code);
1772 // and continue, in case there is more than one
1773 }
1774 }
1775 }
1776
1777 void Method::set_breakpoint(int bci) {
1778 InstanceKlass* ik = method_holder();
1779 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1780 bp->set_next(ik->breakpoints());
1781 ik->set_breakpoints(bp);
1782 // do this last:
1783 bp->set(this);
1784 }
1785
1786 static void clear_matches(Method* m, int bci) {
1787 InstanceKlass* ik = m->method_holder();
1788 BreakpointInfo* prev_bp = NULL;
1789 BreakpointInfo* next_bp;
1790 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1791 next_bp = bp->next();
1792 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1793 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1794 // do this first:
1795 bp->clear(m);
1796 // unhook it
1797 if (prev_bp != NULL)
1798 prev_bp->set_next(next_bp);
1799 else
1800 ik->set_breakpoints(next_bp);
1801 delete bp;
1802 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1803 // at same location. So we have multiple matching (method_index and bci)
1804 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1805 // breakpoint for clear_breakpoint request and keep all other method versions
1806 // BreakpointInfo for future clear_breakpoint request.
1807 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1808 // which is being called when class is unloaded. We delete all the Breakpoint
1809 // information for all versions of method. We may not correctly restore the original
1810 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1811 // so these methods won't be used anymore.
1812 if (bci >= 0) {
1813 break;
1814 }
1815 } else {
1816 // This one is a keeper.
1817 prev_bp = bp;
1818 }
1819 }
1820 }
1821
1822 void Method::clear_breakpoint(int bci) {
1823 assert(bci >= 0, "");
1824 clear_matches(this, bci);
1825 }
1826
1827 void Method::clear_all_breakpoints() {
1828 clear_matches(this, -1);
1829 }
1830
1831 #endif // INCLUDE_JVMTI
1832
1833 int Method::invocation_count() {
1834 MethodCounters *mcs = method_counters();
1835 if (TieredCompilation) {
1836 MethodData* const mdo = method_data();
1837 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1838 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1839 return InvocationCounter::count_limit;
1840 } else {
1841 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1842 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1843 }
1844 } else {
1845 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1846 }
1847 }
1848
1849 int Method::backedge_count() {
1850 MethodCounters *mcs = method_counters();
1851 if (TieredCompilation) {
1852 MethodData* const mdo = method_data();
1853 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1854 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1855 return InvocationCounter::count_limit;
1856 } else {
1857 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1858 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1859 }
1860 } else {
1861 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1862 }
1863 }
1864
1865 int Method::highest_comp_level() const {
1866 const MethodCounters* mcs = method_counters();
1867 if (mcs != NULL) {
1868 return mcs->highest_comp_level();
1869 } else {
1870 return CompLevel_none;
1871 }
1872 }
1873
1874 int Method::highest_osr_comp_level() const {
1875 const MethodCounters* mcs = method_counters();
1876 if (mcs != NULL) {
1877 return mcs->highest_osr_comp_level();
1878 } else {
1879 return CompLevel_none;
1880 }
1881 }
1882
1883 void Method::set_highest_comp_level(int level) {
1884 MethodCounters* mcs = method_counters();
1885 if (mcs != NULL) {
1886 mcs->set_highest_comp_level(level);
1887 }
1888 }
1889
1890 void Method::set_highest_osr_comp_level(int level) {
1891 MethodCounters* mcs = method_counters();
1892 if (mcs != NULL) {
1893 mcs->set_highest_osr_comp_level(level);
1894 }
1895 }
1896
1897 #if INCLUDE_JVMTI
1898
1899 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1900 _bci = bci;
1901 _name_index = m->name_index();
1902 _signature_index = m->signature_index();
1903 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1904 if (_orig_bytecode == Bytecodes::_breakpoint)
1905 _orig_bytecode = m->orig_bytecode_at(_bci);
1906 _next = NULL;
1907 }
1908
1909 void BreakpointInfo::set(Method* method) {
1910 #ifdef ASSERT
1911 {
1912 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1913 if (code == Bytecodes::_breakpoint)
1914 code = method->orig_bytecode_at(_bci);
1915 assert(orig_bytecode() == code, "original bytecode must be the same");
1916 }
1917 #endif
1918 Thread *thread = Thread::current();
1919 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1920 method->incr_number_of_breakpoints(thread);
1921 {
1922 // Deoptimize all dependents on this method
1923 HandleMark hm(thread);
1924 methodHandle mh(thread, method);
1925 CodeCache::flush_dependents_on_method(mh);
1926 }
1927 }
1928
1929 void BreakpointInfo::clear(Method* method) {
1930 *method->bcp_from(_bci) = orig_bytecode();
1931 assert(method->number_of_breakpoints() > 0, "must not go negative");
1932 method->decr_number_of_breakpoints(Thread::current());
1933 }
1934
1935 #endif // INCLUDE_JVMTI
1936
1937 // jmethodID handling
1938
1939 // This is a block allocating object, sort of like JNIHandleBlock, only a
1940 // lot simpler.
1941 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1942 // never get rid of it.
1943
1944 static const int min_block_size = 8;
1945
1946 class JNIMethodBlockNode : public CHeapObj<mtClass> {
1947 friend class JNIMethodBlock;
1948 Method** _methods;
1949 int _number_of_methods;
1950 int _top;
1951 JNIMethodBlockNode* _next;
1952
1953 public:
1954
1955 JNIMethodBlockNode(int num_methods = min_block_size);
1956
1957 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
1958
1959 void ensure_methods(int num_addl_methods) {
1960 if (_top < _number_of_methods) {
1961 num_addl_methods -= _number_of_methods - _top;
1962 if (num_addl_methods <= 0) {
1963 return;
1964 }
1965 }
1966 if (_next == NULL) {
1967 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
1968 } else {
1969 _next->ensure_methods(num_addl_methods);
1970 }
1971 }
1972 };
1973
1974 class JNIMethodBlock : public CHeapObj<mtClass> {
1975 JNIMethodBlockNode _head;
1976 JNIMethodBlockNode *_last_free;
1977 public:
1978 static Method* const _free_method;
1979
1980 JNIMethodBlock(int initial_capacity = min_block_size)
1981 : _head(initial_capacity), _last_free(&_head) {}
1982
1983 void ensure_methods(int num_addl_methods) {
1984 _last_free->ensure_methods(num_addl_methods);
1985 }
1986
1987 Method** add_method(Method* m) {
1988 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) {
1989 if (b->_top < b->_number_of_methods) {
1990 // top points to the next free entry.
1991 int i = b->_top;
1992 b->_methods[i] = m;
1993 b->_top++;
1994 _last_free = b;
1995 return &(b->_methods[i]);
1996 } else if (b->_top == b->_number_of_methods) {
1997 // if the next free entry ran off the block see if there's a free entry
1998 for (int i = 0; i < b->_number_of_methods; i++) {
1999 if (b->_methods[i] == _free_method) {
2000 b->_methods[i] = m;
2001 _last_free = b;
2002 return &(b->_methods[i]);
2003 }
2004 }
2005 // Only check each block once for frees. They're very unlikely.
2006 // Increment top past the end of the block.
2007 b->_top++;
2008 }
2009 // need to allocate a next block.
2010 if (b->_next == NULL) {
2011 b->_next = _last_free = new JNIMethodBlockNode();
2012 }
2013 }
2014 guarantee(false, "Should always allocate a free block");
2015 return NULL;
2016 }
2017
2018 bool contains(Method** m) {
2019 if (m == NULL) return false;
2020 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2021 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2022 // This is a bit of extra checking, for two reasons. One is
2023 // that contains() deals with pointers that are passed in by
2024 // JNI code, so making sure that the pointer is aligned
2025 // correctly is valuable. The other is that <= and > are
2026 // technically not defined on pointers, so the if guard can
2027 // pass spuriously; no modern compiler is likely to make that
2028 // a problem, though (and if one did, the guard could also
2029 // fail spuriously, which would be bad).
2030 ptrdiff_t idx = m - b->_methods;
2031 if (b->_methods + idx == m) {
2032 return true;
2033 }
2034 }
2035 }
2036 return false; // not found
2037 }
2038
2039 // Doesn't really destroy it, just marks it as free so it can be reused.
2040 void destroy_method(Method** m) {
2041 #ifdef ASSERT
2042 assert(contains(m), "should be a methodID");
2043 #endif // ASSERT
2044 *m = _free_method;
2045 }
2046
2047 // During class unloading the methods are cleared, which is different
2048 // than freed.
2049 void clear_all_methods() {
2050 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2051 for (int i = 0; i< b->_number_of_methods; i++) {
2052 b->_methods[i] = NULL;
2053 }
2054 }
2055 }
2056 #ifndef PRODUCT
2057 int count_methods() {
2058 // count all allocated methods
2059 int count = 0;
2060 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2061 for (int i = 0; i< b->_number_of_methods; i++) {
2062 if (b->_methods[i] != _free_method) count++;
2063 }
2064 }
2065 return count;
2066 }
2067 #endif // PRODUCT
2068 };
2069
2070 // Something that can't be mistaken for an address or a markWord
2071 Method* const JNIMethodBlock::_free_method = (Method*)55;
2072
2073 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(NULL) {
2074 _number_of_methods = MAX2(num_methods, min_block_size);
2075 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2076 for (int i = 0; i < _number_of_methods; i++) {
2077 _methods[i] = JNIMethodBlock::_free_method;
2078 }
2079 }
2080
2081 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
2082 ClassLoaderData* cld = loader_data;
2083 if (!SafepointSynchronize::is_at_safepoint()) {
2084 // Have to add jmethod_ids() to class loader data thread-safely.
2085 // Also have to add the method to the list safely, which the cld lock
2086 // protects as well.
2087 MutexLocker ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2088 if (cld->jmethod_ids() == NULL) {
2089 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2090 } else {
2091 cld->jmethod_ids()->ensure_methods(capacity);
2092 }
2093 } else {
2094 // At safepoint, we are single threaded and can set this.
2095 if (cld->jmethod_ids() == NULL) {
2096 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2097 } else {
2098 cld->jmethod_ids()->ensure_methods(capacity);
2099 }
2100 }
2101 }
2102
2103 // Add a method id to the jmethod_ids
2104 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
2105 ClassLoaderData* cld = loader_data;
2106
2107 if (!SafepointSynchronize::is_at_safepoint()) {
2108 // Have to add jmethod_ids() to class loader data thread-safely.
2109 // Also have to add the method to the list safely, which the cld lock
2110 // protects as well.
2111 MutexLocker ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2112 if (cld->jmethod_ids() == NULL) {
2113 cld->set_jmethod_ids(new JNIMethodBlock());
2114 }
2115 // jmethodID is a pointer to Method*
2116 return (jmethodID)cld->jmethod_ids()->add_method(m);
2117 } else {
2118 // At safepoint, we are single threaded and can set this.
2119 if (cld->jmethod_ids() == NULL) {
2120 cld->set_jmethod_ids(new JNIMethodBlock());
2121 }
2122 // jmethodID is a pointer to Method*
2123 return (jmethodID)cld->jmethod_ids()->add_method(m);
2124 }
2125 }
2126
2127 // Mark a jmethodID as free. This is called when there is a data race in
2128 // InstanceKlass while creating the jmethodID cache.
2129 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
2130 ClassLoaderData* cld = loader_data;
2131 Method** ptr = (Method**)m;
2132 assert(cld->jmethod_ids() != NULL, "should have method handles");
2133 cld->jmethod_ids()->destroy_method(ptr);
2134 }
2135
2136 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2137 // Can't assert the method_holder is the same because the new method has the
2138 // scratch method holder.
2139 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2140 == new_method->method_holder()->class_loader() ||
2141 new_method->method_holder()->class_loader() == NULL, // allow Unsafe substitution
2142 "changing to a different class loader");
2143 // Just change the method in place, jmethodID pointer doesn't change.
2144 *((Method**)jmid) = new_method;
2145 }
2146
2147 bool Method::is_method_id(jmethodID mid) {
2148 Method* m = resolve_jmethod_id(mid);
2149 assert(m != NULL, "should be called with non-null method");
2150 InstanceKlass* ik = m->method_holder();
2151 ClassLoaderData* cld = ik->class_loader_data();
2152 if (cld->jmethod_ids() == NULL) return false;
2153 return (cld->jmethod_ids()->contains((Method**)mid));
2154 }
2155
2156 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2157 if (mid == NULL) return NULL;
2158 Method* o = resolve_jmethod_id(mid);
2159 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
2160 return NULL;
2161 }
2162 return o;
2163 };
2164
2165 void Method::set_on_stack(const bool value) {
2166 // Set both the method itself and its constant pool. The constant pool
2167 // on stack means some method referring to it is also on the stack.
2168 constants()->set_on_stack(value);
2169
2170 bool already_set = on_stack();
2171 _access_flags.set_on_stack(value);
2172 if (value && !already_set) {
2173 MetadataOnStackMark::record(this);
2174 }
2175 assert(!value || !is_old() || is_obsolete() || is_running_emcp(),
2176 "emcp methods cannot run after emcp bit is cleared");
2177 }
2178
2179 // Called when the class loader is unloaded to make all methods weak.
2180 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2181 loader_data->jmethod_ids()->clear_all_methods();
2182 }
2183
2184 bool Method::has_method_vptr(const void* ptr) {
2185 Method m;
2186 // This assumes that the vtbl pointer is the first word of a C++ object.
2187 return dereference_vptr(&m) == dereference_vptr(ptr);
2188 }
2189
2190 // Check that this pointer is valid by checking that the vtbl pointer matches
2191 bool Method::is_valid_method(const Method* m) {
2192 if (m == NULL) {
2193 return false;
2194 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2195 // Quick sanity check on pointer.
2196 return false;
2197 } else if (m->is_shared()) {
2198 return MetaspaceShared::is_valid_shared_method(m);
2199 } else if (Metaspace::contains_non_shared(m)) {
2200 return has_method_vptr((const void*)m);
2201 } else {
2202 return false;
2203 }
2204 }
2205
2206 #ifndef PRODUCT
2207 void Method::print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) {
2208 out->print(" jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
2209 }
2210 #endif // PRODUCT
2211
2212
2213 // Printing
2214
2215 #ifndef PRODUCT
2216
2217 void Method::print_on(outputStream* st) const {
2218 ResourceMark rm;
2219 assert(is_method(), "must be method");
2220 st->print_cr("%s", internal_name());
2221 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this));
2222 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2223 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants()));
2224 constants()->print_value_on(st); st->cr();
2225 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2226 st->print (" - name: "); name()->print_value_on(st); st->cr();
2227 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2228 st->print_cr(" - max stack: %d", max_stack());
2229 st->print_cr(" - max locals: %d", max_locals());
2230 st->print_cr(" - size of params: %d", size_of_parameters());
2231 st->print_cr(" - method size: %d", method_size());
2232 if (intrinsic_id() != vmIntrinsics::_none)
2233 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
2234 if (highest_comp_level() != CompLevel_none)
2235 st->print_cr(" - highest level: %d", highest_comp_level());
2236 st->print_cr(" - vtable index: %d", _vtable_index);
2237 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry()));
2238 st->print( " - adapters: ");
2239 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2240 if (a == NULL)
2241 st->print_cr(INTPTR_FORMAT, p2i(a));
2242 else
2243 a->print_adapter_on(st);
2244 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry()));
2245 st->print_cr(" - code size: %d", code_size());
2246 if (code_size() != 0) {
2247 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base()));
2248 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size()));
2249 }
2250 if (method_data() != NULL) {
2251 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data()));
2252 }
2253 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2254 if (checked_exceptions_length() > 0) {
2255 CheckedExceptionElement* table = checked_exceptions_start();
2256 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table));
2257 if (Verbose) {
2258 for (int i = 0; i < checked_exceptions_length(); i++) {
2259 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2260 }
2261 }
2262 }
2263 if (has_linenumber_table()) {
2264 u_char* table = compressed_linenumber_table();
2265 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table));
2266 if (Verbose) {
2267 CompressedLineNumberReadStream stream(table);
2268 while (stream.read_pair()) {
2269 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2270 }
2271 }
2272 }
2273 st->print_cr(" - localvar length: %d", localvariable_table_length());
2274 if (localvariable_table_length() > 0) {
2275 LocalVariableTableElement* table = localvariable_table_start();
2276 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table));
2277 if (Verbose) {
2278 for (int i = 0; i < localvariable_table_length(); i++) {
2279 int bci = table[i].start_bci;
2280 int len = table[i].length;
2281 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2282 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2283 int slot = table[i].slot;
2284 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2285 }
2286 }
2287 }
2288 if (code() != NULL) {
2289 st->print (" - compiled code: ");
2290 code()->print_value_on(st);
2291 }
2292 if (is_native()) {
2293 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function()));
2294 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler()));
2295 }
2296 }
2297
2298 void Method::print_linkage_flags(outputStream* st) {
2299 access_flags().print_on(st);
2300 if (is_default_method()) {
2301 st->print("default ");
2302 }
2303 if (is_overpass()) {
2304 st->print("overpass ");
2305 }
2306 }
2307 #endif //PRODUCT
2308
2309 void Method::print_value_on(outputStream* st) const {
2310 assert(is_method(), "must be method");
2311 st->print("%s", internal_name());
2312 print_address_on(st);
2313 st->print(" ");
2314 name()->print_value_on(st);
2315 st->print(" ");
2316 signature()->print_value_on(st);
2317 st->print(" in ");
2318 method_holder()->print_value_on(st);
2319 if (WizardMode) st->print("#%d", _vtable_index);
2320 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2321 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2322 }
2323
2324 #if INCLUDE_SERVICES
2325 // Size Statistics
2326 void Method::collect_statistics(KlassSizeStats *sz) const {
2327 int mysize = sz->count(this);
2328 sz->_method_bytes += mysize;
2329 sz->_method_all_bytes += mysize;
2330 sz->_rw_bytes += mysize;
2331
2332 if (constMethod()) {
2333 constMethod()->collect_statistics(sz);
2334 }
2335 if (method_data()) {
2336 method_data()->collect_statistics(sz);
2337 }
2338 }
2339 #endif // INCLUDE_SERVICES
2340
2341 // LogTouchedMethods and PrintTouchedMethods
2342
2343 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because
2344 // the Method may be garbage collected. Let's roll our own hash table.
2345 class TouchedMethodRecord : CHeapObj<mtTracing> {
2346 public:
2347 // It's OK to store Symbols here because they will NOT be GC'ed if
2348 // LogTouchedMethods is enabled.
2349 TouchedMethodRecord* _next;
2350 Symbol* _class_name;
2351 Symbol* _method_name;
2352 Symbol* _method_signature;
2353 };
2354
2355 static const int TOUCHED_METHOD_TABLE_SIZE = 20011;
2356 static TouchedMethodRecord** _touched_method_table = NULL;
2357
2358 void Method::log_touched(TRAPS) {
2359
2360 const int table_size = TOUCHED_METHOD_TABLE_SIZE;
2361 Symbol* my_class = klass_name();
2362 Symbol* my_name = name();
2363 Symbol* my_sig = signature();
2364
2365 unsigned int hash = my_class->identity_hash() +
2366 my_name->identity_hash() +
2367 my_sig->identity_hash();
2368 juint index = juint(hash) % table_size;
2369
2370 MutexLocker ml(TouchedMethodLog_lock, THREAD);
2371 if (_touched_method_table == NULL) {
2372 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size,
2373 mtTracing, CURRENT_PC);
2374 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size);
2375 }
2376
2377 TouchedMethodRecord* ptr = _touched_method_table[index];
2378 while (ptr) {
2379 if (ptr->_class_name == my_class &&
2380 ptr->_method_name == my_name &&
2381 ptr->_method_signature == my_sig) {
2382 return;
2383 }
2384 if (ptr->_next == NULL) break;
2385 ptr = ptr->_next;
2386 }
2387 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing);
2388 my_class->increment_refcount();
2389 my_name->increment_refcount();
2390 my_sig->increment_refcount();
2391 nptr->_class_name = my_class;
2392 nptr->_method_name = my_name;
2393 nptr->_method_signature = my_sig;
2394 nptr->_next = NULL;
2395
2396 if (ptr == NULL) {
2397 // first
2398 _touched_method_table[index] = nptr;
2399 } else {
2400 ptr->_next = nptr;
2401 }
2402 }
2403
2404 void Method::print_touched_methods(outputStream* out) {
2405 MutexLocker ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock);
2406 out->print_cr("# Method::print_touched_methods version 1");
2407 if (_touched_method_table) {
2408 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) {
2409 TouchedMethodRecord* ptr = _touched_method_table[i];
2410 while(ptr) {
2411 ptr->_class_name->print_symbol_on(out); out->print(".");
2412 ptr->_method_name->print_symbol_on(out); out->print(":");
2413 ptr->_method_signature->print_symbol_on(out); out->cr();
2414 ptr = ptr->_next;
2415 }
2416 }
2417 }
2418 }
2419
2420 // Verification
2421
2422 void Method::verify_on(outputStream* st) {
2423 guarantee(is_method(), "object must be method");
2424 guarantee(constants()->is_constantPool(), "should be constant pool");
2425 MethodData* md = method_data();
2426 guarantee(md == NULL ||
2427 md->is_methodData(), "should be method data");
2428 }