1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/metadataOnStackMark.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/debugInfoRec.hpp"
30 #include "gc/shared/collectedHeap.inline.hpp"
31 #include "gc/shared/gcLocker.hpp"
32 #include "gc/shared/generation.hpp"
33 #include "interpreter/bytecodeStream.hpp"
34 #include "interpreter/bytecodeTracer.hpp"
35 #include "interpreter/bytecodes.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "interpreter/oopMapCache.hpp"
38 #include "memory/heapInspection.hpp"
39 #include "memory/metadataFactory.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "oops/constMethod.hpp"
42 #include "oops/method.hpp"
43 #include "oops/methodData.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "oops/symbol.hpp"
46 #include "prims/jvmtiExport.hpp"
47 #include "prims/methodHandles.hpp"
48 #include "prims/nativeLookup.hpp"
49 #include "runtime/arguments.hpp"
50 #include "runtime/compilationPolicy.hpp"
51 #include "runtime/frame.inline.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "runtime/orderAccess.inline.hpp"
54 #include "runtime/relocator.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "runtime/signature.hpp"
57 #include "utilities/quickSort.hpp"
58 #include "utilities/xmlstream.hpp"
59
60 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
61
62 // Implementation of Method
63
64 Method* Method::allocate(ClassLoaderData* loader_data,
65 int byte_code_size,
66 AccessFlags access_flags,
67 InlineTableSizes* sizes,
68 ConstMethod::MethodType method_type,
69 TRAPS) {
70 assert(!access_flags.is_native() || byte_code_size == 0,
71 "native methods should not contain byte codes");
72 ConstMethod* cm = ConstMethod::allocate(loader_data,
73 byte_code_size,
74 sizes,
75 method_type,
76 CHECK_NULL);
77
78 int size = Method::size(access_flags.is_native());
79
80 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, size);
81 }
82
83 Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) {
84 No_Safepoint_Verifier no_safepoint;
85 set_constMethod(xconst);
86 set_access_flags(access_flags);
87 set_method_size(size);
88 #ifdef CC_INTERP
89 set_result_index(T_VOID);
90 #endif
91 set_intrinsic_id(vmIntrinsics::_none);
92 set_jfr_towrite(false);
93 set_force_inline(false);
94 set_hidden(false);
95 set_dont_inline(false);
96 set_has_injected_profile(false);
97 set_method_data(NULL);
98 clear_method_counters();
99 set_vtable_index(Method::garbage_vtable_index);
100
101 // Fix and bury in Method*
102 set_interpreter_entry(NULL); // sets i2i entry and from_int
103 set_adapter_entry(NULL);
104 clear_code(); // from_c/from_i get set to c2i/i2i
105
106 if (access_flags.is_native()) {
107 clear_native_function();
108 set_signature_handler(NULL);
109 }
110
111 NOT_PRODUCT(set_compiled_invocation_count(0);)
112 }
113
114 // Release Method*. The nmethod will be gone when we get here because
115 // we've walked the code cache.
116 void Method::deallocate_contents(ClassLoaderData* loader_data) {
117 MetadataFactory::free_metadata(loader_data, constMethod());
118 set_constMethod(NULL);
119 MetadataFactory::free_metadata(loader_data, method_data());
120 set_method_data(NULL);
121 MetadataFactory::free_metadata(loader_data, method_counters());
122 clear_method_counters();
123 // The nmethod will be gone when we get here.
124 if (code() != NULL) _code = NULL;
125 }
126
127 address Method::get_i2c_entry() {
128 assert(_adapter != NULL, "must have");
129 return _adapter->get_i2c_entry();
130 }
131
132 address Method::get_c2i_entry() {
133 assert(_adapter != NULL, "must have");
134 return _adapter->get_c2i_entry();
135 }
136
137 address Method::get_c2i_unverified_entry() {
138 assert(_adapter != NULL, "must have");
139 return _adapter->get_c2i_unverified_entry();
140 }
141
142 char* Method::name_and_sig_as_C_string() const {
143 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
144 }
145
146 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
147 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
148 }
149
150 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
151 const char* klass_name = klass->external_name();
152 int klass_name_len = (int)strlen(klass_name);
153 int method_name_len = method_name->utf8_length();
154 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
155 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
156 strcpy(dest, klass_name);
157 dest[klass_name_len] = '.';
158 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
159 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
160 dest[len] = 0;
161 return dest;
162 }
163
164 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
165 Symbol* klass_name = klass->name();
166 klass_name->as_klass_external_name(buf, size);
167 int len = (int)strlen(buf);
168
169 if (len < size - 1) {
170 buf[len++] = '.';
171
172 method_name->as_C_string(&(buf[len]), size - len);
173 len = (int)strlen(buf);
174
175 signature->as_C_string(&(buf[len]), size - len);
176 }
177
178 return buf;
179 }
180
181 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) {
182 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
183 // access exception table
184 ExceptionTable table(mh());
185 int length = table.length();
186 // iterate through all entries sequentially
187 constantPoolHandle pool(THREAD, mh->constants());
188 for (int i = 0; i < length; i ++) {
189 //reacquire the table in case a GC happened
190 ExceptionTable table(mh());
191 int beg_bci = table.start_pc(i);
192 int end_bci = table.end_pc(i);
193 assert(beg_bci <= end_bci, "inconsistent exception table");
194 if (beg_bci <= throw_bci && throw_bci < end_bci) {
195 // exception handler bci range covers throw_bci => investigate further
196 int handler_bci = table.handler_pc(i);
197 int klass_index = table.catch_type_index(i);
198 if (klass_index == 0) {
199 return handler_bci;
200 } else if (ex_klass.is_null()) {
201 return handler_bci;
202 } else {
203 // we know the exception class => get the constraint class
204 // this may require loading of the constraint class; if verification
205 // fails or some other exception occurs, return handler_bci
206 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
207 KlassHandle klass = KlassHandle(THREAD, k);
208 assert(klass.not_null(), "klass not loaded");
209 if (ex_klass->is_subtype_of(klass())) {
210 return handler_bci;
211 }
212 }
213 }
214 }
215
216 return -1;
217 }
218
219 void Method::mask_for(int bci, InterpreterOopMap* mask) {
220
221 Thread* myThread = Thread::current();
222 methodHandle h_this(myThread, this);
223 #ifdef ASSERT
224 bool has_capability = myThread->is_VM_thread() ||
225 myThread->is_ConcurrentGC_thread() ||
226 myThread->is_GC_task_thread();
227
228 if (!has_capability) {
229 if (!VerifyStack && !VerifyLastFrame) {
230 // verify stack calls this outside VM thread
231 warning("oopmap should only be accessed by the "
232 "VM, GC task or CMS threads (or during debugging)");
233 InterpreterOopMap local_mask;
234 method_holder()->mask_for(h_this, bci, &local_mask);
235 local_mask.print();
236 }
237 }
238 #endif
239 method_holder()->mask_for(h_this, bci, mask);
240 return;
241 }
242
243
244 int Method::bci_from(address bcp) const {
245 if (is_native() && bcp == 0) {
246 return 0;
247 }
248 #ifdef ASSERT
249 { ResourceMark rm;
250 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
251 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string());
252 }
253 #endif
254 return bcp - code_base();
255 }
256
257
258 int Method::validate_bci(int bci) const {
259 return (bci == 0 || bci < code_size()) ? bci : -1;
260 }
261
262 // Return bci if it appears to be a valid bcp
263 // Return -1 otherwise.
264 // Used by profiling code, when invalid data is a possibility.
265 // The caller is responsible for validating the Method* itself.
266 int Method::validate_bci_from_bcp(address bcp) const {
267 // keep bci as -1 if not a valid bci
268 int bci = -1;
269 if (bcp == 0 || bcp == code_base()) {
270 // code_size() may return 0 and we allow 0 here
271 // the method may be native
272 bci = 0;
273 } else if (contains(bcp)) {
274 bci = bcp - code_base();
275 }
276 // Assert that if we have dodged any asserts, bci is negative.
277 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
278 return bci;
279 }
280
281 address Method::bcp_from(int bci) const {
282 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci: %d", bci);
283 address bcp = code_base() + bci;
284 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
285 return bcp;
286 }
287
288 address Method::bcp_from(address bcp) const {
289 if (is_native() && bcp == NULL) {
290 return code_base();
291 } else {
292 return bcp;
293 }
294 }
295
296 int Method::size(bool is_native) {
297 // If native, then include pointers for native_function and signature_handler
298 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
299 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
300 return align_object_size(header_size() + extra_words);
301 }
302
303
304 Symbol* Method::klass_name() const {
305 Klass* k = method_holder();
306 assert(k->is_klass(), "must be klass");
307 InstanceKlass* ik = (InstanceKlass*) k;
308 return ik->name();
309 }
310
311
312 // Attempt to return method oop to original state. Clear any pointers
313 // (to objects outside the shared spaces). We won't be able to predict
314 // where they should point in a new JVM. Further initialize some
315 // entries now in order allow them to be write protected later.
316
317 void Method::remove_unshareable_info() {
318 unlink_method();
319 }
320
321
322 bool Method::was_executed_more_than(int n) {
323 // Invocation counter is reset when the Method* is compiled.
324 // If the method has compiled code we therefore assume it has
325 // be excuted more than n times.
326 if (is_accessor() || is_empty_method() || (code() != NULL)) {
327 // interpreter doesn't bump invocation counter of trivial methods
328 // compiler does not bump invocation counter of compiled methods
329 return true;
330 }
331 else if ((method_counters() != NULL &&
332 method_counters()->invocation_counter()->carry()) ||
333 (method_data() != NULL &&
334 method_data()->invocation_counter()->carry())) {
335 // The carry bit is set when the counter overflows and causes
336 // a compilation to occur. We don't know how many times
337 // the counter has been reset, so we simply assume it has
338 // been executed more than n times.
339 return true;
340 } else {
341 return invocation_count() > n;
342 }
343 }
344
345 void Method::print_invocation_count() {
346 if (is_static()) tty->print("static ");
347 if (is_final()) tty->print("final ");
348 if (is_synchronized()) tty->print("synchronized ");
349 if (is_native()) tty->print("native ");
350 tty->print("%s::", method_holder()->external_name());
351 name()->print_symbol_on(tty);
352 signature()->print_symbol_on(tty);
353
354 if (WizardMode) {
355 // dump the size of the byte codes
356 tty->print(" {%d}", code_size());
357 }
358 tty->cr();
359
360 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
361 tty->print_cr (" invocation_counter: %8d ", invocation_count());
362 tty->print_cr (" backedge_counter: %8d ", backedge_count());
363 #ifndef PRODUCT
364 if (CountCompiledCalls) {
365 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
366 }
367 #endif
368 }
369
370 // Build a MethodData* object to hold information about this method
371 // collected in the interpreter.
372 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
373 // Do not profile the method if metaspace has hit an OOM previously
374 // allocating profiling data. Callers clear pending exception so don't
375 // add one here.
376 if (ClassLoaderDataGraph::has_metaspace_oom()) {
377 return;
378 }
379
380 // Do not profile method if current thread holds the pending list lock,
381 // which avoids deadlock for acquiring the MethodData_lock.
382 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
383 return;
384 }
385
386 // Grab a lock here to prevent multiple
387 // MethodData*s from being created.
388 MutexLocker ml(MethodData_lock, THREAD);
389 if (method->method_data() == NULL) {
390 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
391 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
392 if (HAS_PENDING_EXCEPTION) {
393 CompileBroker::log_metaspace_failure();
394 ClassLoaderDataGraph::set_metaspace_oom(true);
395 return; // return the exception (which is cleared)
396 }
397
398 method->set_method_data(method_data);
399 if (PrintMethodData && (Verbose || WizardMode)) {
400 ResourceMark rm(THREAD);
401 tty->print("build_interpreter_method_data for ");
402 method->print_name(tty);
403 tty->cr();
404 // At the end of the run, the MDO, full of data, will be dumped.
405 }
406 }
407 }
408
409 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
410 // Do not profile the method if metaspace has hit an OOM previously
411 if (ClassLoaderDataGraph::has_metaspace_oom()) {
412 return NULL;
413 }
414
415 methodHandle mh(m);
416 MethodCounters* counters = MethodCounters::allocate(mh, THREAD);
417 if (HAS_PENDING_EXCEPTION) {
418 CompileBroker::log_metaspace_failure();
419 ClassLoaderDataGraph::set_metaspace_oom(true);
420 return NULL; // return the exception (which is cleared)
421 }
422 if (!mh->init_method_counters(counters)) {
423 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
424 }
425
426 if (LogTouchedMethods) {
427 mh->log_touched(CHECK_NULL);
428 }
429
430 return mh->method_counters();
431 }
432
433 void Method::cleanup_inline_caches() {
434 // The current system doesn't use inline caches in the interpreter
435 // => nothing to do (keep this method around for future use)
436 }
437
438
439 int Method::extra_stack_words() {
440 // not an inline function, to avoid a header dependency on Interpreter
441 return extra_stack_entries() * Interpreter::stackElementSize;
442 }
443
444
445 void Method::compute_size_of_parameters(Thread *thread) {
446 ArgumentSizeComputer asc(signature());
447 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
448 }
449
450 #ifdef CC_INTERP
451 void Method::set_result_index(BasicType type) {
452 _result_index = Interpreter::BasicType_as_index(type);
453 }
454 #endif
455
456 BasicType Method::result_type() const {
457 ResultTypeFinder rtf(signature());
458 return rtf.type();
459 }
460
461
462 bool Method::is_empty_method() const {
463 return code_size() == 1
464 && *code_base() == Bytecodes::_return;
465 }
466
467
468 bool Method::is_vanilla_constructor() const {
469 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
470 // which only calls the superclass vanilla constructor and possibly does stores of
471 // zero constants to local fields:
472 //
473 // aload_0
474 // invokespecial
475 // indexbyte1
476 // indexbyte2
477 //
478 // followed by an (optional) sequence of:
479 //
480 // aload_0
481 // aconst_null / iconst_0 / fconst_0 / dconst_0
482 // putfield
483 // indexbyte1
484 // indexbyte2
485 //
486 // followed by:
487 //
488 // return
489
490 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
491 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
492 int size = code_size();
493 // Check if size match
494 if (size == 0 || size % 5 != 0) return false;
495 address cb = code_base();
496 int last = size - 1;
497 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
498 // Does not call superclass default constructor
499 return false;
500 }
501 // Check optional sequence
502 for (int i = 4; i < last; i += 5) {
503 if (cb[i] != Bytecodes::_aload_0) return false;
504 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
505 if (cb[i+2] != Bytecodes::_putfield) return false;
506 }
507 return true;
508 }
509
510
511 bool Method::compute_has_loops_flag() {
512 BytecodeStream bcs(this);
513 Bytecodes::Code bc;
514
515 while ((bc = bcs.next()) >= 0) {
516 switch( bc ) {
517 case Bytecodes::_ifeq:
518 case Bytecodes::_ifnull:
519 case Bytecodes::_iflt:
520 case Bytecodes::_ifle:
521 case Bytecodes::_ifne:
522 case Bytecodes::_ifnonnull:
523 case Bytecodes::_ifgt:
524 case Bytecodes::_ifge:
525 case Bytecodes::_if_icmpeq:
526 case Bytecodes::_if_icmpne:
527 case Bytecodes::_if_icmplt:
528 case Bytecodes::_if_icmpgt:
529 case Bytecodes::_if_icmple:
530 case Bytecodes::_if_icmpge:
531 case Bytecodes::_if_acmpeq:
532 case Bytecodes::_if_acmpne:
533 case Bytecodes::_goto:
534 case Bytecodes::_jsr:
535 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
536 break;
537
538 case Bytecodes::_goto_w:
539 case Bytecodes::_jsr_w:
540 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
541 break;
542 }
543 }
544 _access_flags.set_loops_flag_init();
545 return _access_flags.has_loops();
546 }
547
548 bool Method::is_final_method(AccessFlags class_access_flags) const {
549 // or "does_not_require_vtable_entry"
550 // default method or overpass can occur, is not final (reuses vtable entry)
551 // private methods get vtable entries for backward class compatibility.
552 if (is_overpass() || is_default_method()) return false;
553 return is_final() || class_access_flags.is_final();
554 }
555
556 bool Method::is_final_method() const {
557 return is_final_method(method_holder()->access_flags());
558 }
559
560 bool Method::is_default_method() const {
561 if (method_holder() != NULL &&
562 method_holder()->is_interface() &&
563 !is_abstract()) {
564 return true;
565 } else {
566 return false;
567 }
568 }
569
570 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
571 if (is_final_method(class_access_flags)) return true;
572 #ifdef ASSERT
573 ResourceMark rm;
574 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
575 if (class_access_flags.is_interface()) {
576 assert(is_nonv == is_static(), "is_nonv=%s", name_and_sig_as_C_string());
577 }
578 #endif
579 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
580 return vtable_index() == nonvirtual_vtable_index;
581 }
582
583 bool Method::can_be_statically_bound() const {
584 return can_be_statically_bound(method_holder()->access_flags());
585 }
586
587 bool Method::is_accessor() const {
588 if (code_size() != 5) return false;
589 if (size_of_parameters() != 1) return false;
590 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
591 if (java_code_at(1) != Bytecodes::_getfield) return false;
592 if (java_code_at(4) != Bytecodes::_areturn &&
593 java_code_at(4) != Bytecodes::_ireturn ) return false;
594 return true;
595 }
596
597 bool Method::is_constant_getter() const {
598 int last_index = code_size() - 1;
599 // Check if the first 1-3 bytecodes are a constant push
600 // and the last bytecode is a return.
601 return (2 <= code_size() && code_size() <= 4 &&
602 Bytecodes::is_const(java_code_at(0)) &&
603 Bytecodes::length_for(java_code_at(0)) == last_index &&
604 Bytecodes::is_return(java_code_at(last_index)));
605 }
606
607 bool Method::is_initializer() const {
608 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
609 }
610
611 bool Method::has_valid_initializer_flags() const {
612 return (is_static() ||
613 method_holder()->major_version() < 51);
614 }
615
616 bool Method::is_static_initializer() const {
617 // For classfiles version 51 or greater, ensure that the clinit method is
618 // static. Non-static methods with the name "<clinit>" are not static
619 // initializers. (older classfiles exempted for backward compatibility)
620 return name() == vmSymbols::class_initializer_name() &&
621 has_valid_initializer_flags();
622 }
623
624
625 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
626 int length = method->checked_exceptions_length();
627 if (length == 0) { // common case
628 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
629 } else {
630 methodHandle h_this(THREAD, method);
631 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
632 objArrayHandle mirrors (THREAD, m_oop);
633 for (int i = 0; i < length; i++) {
634 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
635 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
636 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
637 mirrors->obj_at_put(i, k->java_mirror());
638 }
639 return mirrors;
640 }
641 };
642
643
644 int Method::line_number_from_bci(int bci) const {
645 if (bci == SynchronizationEntryBCI) bci = 0;
646 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
647 int best_bci = 0;
648 int best_line = -1;
649
650 if (has_linenumber_table()) {
651 // The line numbers are a short array of 2-tuples [start_pc, line_number].
652 // Not necessarily sorted and not necessarily one-to-one.
653 CompressedLineNumberReadStream stream(compressed_linenumber_table());
654 while (stream.read_pair()) {
655 if (stream.bci() == bci) {
656 // perfect match
657 return stream.line();
658 } else {
659 // update best_bci/line
660 if (stream.bci() < bci && stream.bci() >= best_bci) {
661 best_bci = stream.bci();
662 best_line = stream.line();
663 }
664 }
665 }
666 }
667 return best_line;
668 }
669
670
671 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
672 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
673 Thread *thread = Thread::current();
674 Symbol* klass_name = constants()->klass_name_at(klass_index);
675 Handle loader(thread, method_holder()->class_loader());
676 Handle prot (thread, method_holder()->protection_domain());
677 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
678 } else {
679 return true;
680 }
681 }
682
683
684 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
685 int klass_index = constants()->klass_ref_index_at(refinfo_index);
686 if (must_be_resolved) {
687 // Make sure klass is resolved in constantpool.
688 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
689 }
690 return is_klass_loaded_by_klass_index(klass_index);
691 }
692
693
694 void Method::set_native_function(address function, bool post_event_flag) {
695 assert(function != NULL, "use clear_native_function to unregister natives");
696 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
697 address* native_function = native_function_addr();
698
699 // We can see racers trying to place the same native function into place. Once
700 // is plenty.
701 address current = *native_function;
702 if (current == function) return;
703 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
704 function != NULL) {
705 // native_method_throw_unsatisfied_link_error_entry() should only
706 // be passed when post_event_flag is false.
707 assert(function !=
708 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
709 "post_event_flag mis-match");
710
711 // post the bind event, and possible change the bind function
712 JvmtiExport::post_native_method_bind(this, &function);
713 }
714 *native_function = function;
715 // This function can be called more than once. We must make sure that we always
716 // use the latest registered method -> check if a stub already has been generated.
717 // If so, we have to make it not_entrant.
718 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
719 if (nm != NULL) {
720 nm->make_not_entrant();
721 }
722 }
723
724
725 bool Method::has_native_function() const {
726 if (is_method_handle_intrinsic())
727 return false; // special-cased in SharedRuntime::generate_native_wrapper
728 address func = native_function();
729 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
730 }
731
732
733 void Method::clear_native_function() {
734 // Note: is_method_handle_intrinsic() is allowed here.
735 set_native_function(
736 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
737 !native_bind_event_is_interesting);
738 clear_code();
739 }
740
741 address Method::critical_native_function() {
742 methodHandle mh(this);
743 return NativeLookup::lookup_critical_entry(mh);
744 }
745
746
747 void Method::set_signature_handler(address handler) {
748 address* signature_handler = signature_handler_addr();
749 *signature_handler = handler;
750 }
751
752
753 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
754 if (PrintCompilation && report) {
755 ttyLocker ttyl;
756 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
757 if (comp_level == CompLevel_all) {
758 tty->print("all levels ");
759 } else {
760 tty->print("levels ");
761 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
762 tty->print("%d ", i);
763 }
764 }
765 this->print_short_name(tty);
766 int size = this->code_size();
767 if (size > 0) {
768 tty->print(" (%d bytes)", size);
769 }
770 if (reason != NULL) {
771 tty->print(" %s", reason);
772 }
773 tty->cr();
774 }
775 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
776 ttyLocker ttyl;
777 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
778 os::current_thread_id(), is_osr, comp_level);
779 if (reason != NULL) {
780 xtty->print(" reason=\'%s\'", reason);
781 }
782 xtty->method(this);
783 xtty->stamp();
784 xtty->end_elem();
785 }
786 }
787
788 bool Method::is_always_compilable() const {
789 // Generated adapters must be compiled
790 if (is_method_handle_intrinsic() && is_synthetic()) {
791 assert(!is_not_c1_compilable(), "sanity check");
792 assert(!is_not_c2_compilable(), "sanity check");
793 return true;
794 }
795
796 return false;
797 }
798
799 bool Method::is_not_compilable(int comp_level) const {
800 if (number_of_breakpoints() > 0)
801 return true;
802 if (is_always_compilable())
803 return false;
804 if (comp_level == CompLevel_any)
805 return is_not_c1_compilable() || is_not_c2_compilable();
806 if (is_c1_compile(comp_level))
807 return is_not_c1_compilable();
808 if (is_c2_compile(comp_level))
809 return is_not_c2_compilable();
810 return false;
811 }
812
813 // call this when compiler finds that this method is not compilable
814 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
815 if (is_always_compilable()) {
816 // Don't mark a method which should be always compilable
817 return;
818 }
819 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
820 if (comp_level == CompLevel_all) {
821 set_not_c1_compilable();
822 set_not_c2_compilable();
823 } else {
824 if (is_c1_compile(comp_level))
825 set_not_c1_compilable();
826 if (is_c2_compile(comp_level))
827 set_not_c2_compilable();
828 }
829 CompilationPolicy::policy()->disable_compilation(this);
830 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
831 }
832
833 bool Method::is_not_osr_compilable(int comp_level) const {
834 if (is_not_compilable(comp_level))
835 return true;
836 if (comp_level == CompLevel_any)
837 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
838 if (is_c1_compile(comp_level))
839 return is_not_c1_osr_compilable();
840 if (is_c2_compile(comp_level))
841 return is_not_c2_osr_compilable();
842 return false;
843 }
844
845 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
846 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
847 if (comp_level == CompLevel_all) {
848 set_not_c1_osr_compilable();
849 set_not_c2_osr_compilable();
850 } else {
851 if (is_c1_compile(comp_level))
852 set_not_c1_osr_compilable();
853 if (is_c2_compile(comp_level))
854 set_not_c2_osr_compilable();
855 }
856 CompilationPolicy::policy()->disable_compilation(this);
857 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
858 }
859
860 // Revert to using the interpreter and clear out the nmethod
861 void Method::clear_code() {
862
863 // this may be NULL if c2i adapters have not been made yet
864 // Only should happen at allocate time.
865 if (_adapter == NULL) {
866 _from_compiled_entry = NULL;
867 } else {
868 _from_compiled_entry = _adapter->get_c2i_entry();
869 }
870 OrderAccess::storestore();
871 _from_interpreted_entry = _i2i_entry;
872 OrderAccess::storestore();
873 _code = NULL;
874 }
875
876 // Called by class data sharing to remove any entry points (which are not shared)
877 void Method::unlink_method() {
878 _code = NULL;
879 _i2i_entry = NULL;
880 _from_interpreted_entry = NULL;
881 if (is_native()) {
882 *native_function_addr() = NULL;
883 set_signature_handler(NULL);
884 }
885 NOT_PRODUCT(set_compiled_invocation_count(0);)
886 _adapter = NULL;
887 _from_compiled_entry = NULL;
888
889 // In case of DumpSharedSpaces, _method_data should always be NULL.
890 //
891 // During runtime (!DumpSharedSpaces), when we are cleaning a
892 // shared class that failed to load, this->link_method() may
893 // have already been called (before an exception happened), so
894 // this->_method_data may not be NULL.
895 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?");
896
897 set_method_data(NULL);
898 clear_method_counters();
899 }
900
901 // Called when the method_holder is getting linked. Setup entrypoints so the method
902 // is ready to be called from interpreter, compiler, and vtables.
903 void Method::link_method(methodHandle h_method, TRAPS) {
904 // If the code cache is full, we may reenter this function for the
905 // leftover methods that weren't linked.
906 if (_i2i_entry != NULL) return;
907
908 assert(_adapter == NULL, "init'd to NULL" );
909 assert( _code == NULL, "nothing compiled yet" );
910
911 // Setup interpreter entrypoint
912 assert(this == h_method(), "wrong h_method()" );
913 address entry = Interpreter::entry_for_method(h_method);
914 assert(entry != NULL, "interpreter entry must be non-null");
915 // Sets both _i2i_entry and _from_interpreted_entry
916 set_interpreter_entry(entry);
917
918 // Don't overwrite already registered native entries.
919 if (is_native() && !has_native_function()) {
920 set_native_function(
921 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
922 !native_bind_event_is_interesting);
923 }
924
925 // Setup compiler entrypoint. This is made eagerly, so we do not need
926 // special handling of vtables. An alternative is to make adapters more
927 // lazily by calling make_adapter() from from_compiled_entry() for the
928 // normal calls. For vtable calls life gets more complicated. When a
929 // call-site goes mega-morphic we need adapters in all methods which can be
930 // called from the vtable. We need adapters on such methods that get loaded
931 // later. Ditto for mega-morphic itable calls. If this proves to be a
932 // problem we'll make these lazily later.
933 (void) make_adapters(h_method, CHECK);
934
935 // ONLY USE the h_method now as make_adapter may have blocked
936
937 }
938
939 address Method::make_adapters(methodHandle mh, TRAPS) {
940 // Adapters for compiled code are made eagerly here. They are fairly
941 // small (generally < 100 bytes) and quick to make (and cached and shared)
942 // so making them eagerly shouldn't be too expensive.
943 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
944 if (adapter == NULL ) {
945 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
946 }
947
948 mh->set_adapter_entry(adapter);
949 mh->_from_compiled_entry = adapter->get_c2i_entry();
950 return adapter->get_c2i_entry();
951 }
952
953 void Method::restore_unshareable_info(TRAPS) {
954 // Since restore_unshareable_info can be called more than once for a method, don't
955 // redo any work. If this field is restored, there is nothing to do.
956 if (_from_compiled_entry == NULL) {
957 // restore method's vtable by calling a virtual function
958 restore_vtable();
959
960 methodHandle mh(THREAD, this);
961 link_method(mh, CHECK);
962 }
963 }
964
965
966 // The verified_code_entry() must be called when a invoke is resolved
967 // on this method.
968
969 // It returns the compiled code entry point, after asserting not null.
970 // This function is called after potential safepoints so that nmethod
971 // or adapter that it points to is still live and valid.
972 // This function must not hit a safepoint!
973 address Method::verified_code_entry() {
974 debug_only(No_Safepoint_Verifier nsv;)
975 assert(_from_compiled_entry != NULL, "must be set");
976 return _from_compiled_entry;
977 }
978
979 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
980 // (could be racing a deopt).
981 // Not inline to avoid circular ref.
982 bool Method::check_code() const {
983 // cached in a register or local. There's a race on the value of the field.
984 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
985 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
986 }
987
988 // Install compiled code. Instantly it can execute.
989 void Method::set_code(methodHandle mh, nmethod *code) {
990 assert( code, "use clear_code to remove code" );
991 assert( mh->check_code(), "" );
992
993 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
994
995 // These writes must happen in this order, because the interpreter will
996 // directly jump to from_interpreted_entry which jumps to an i2c adapter
997 // which jumps to _from_compiled_entry.
998 mh->_code = code; // Assign before allowing compiled code to exec
999
1000 int comp_level = code->comp_level();
1001 // In theory there could be a race here. In practice it is unlikely
1002 // and not worth worrying about.
1003 if (comp_level > mh->highest_comp_level()) {
1004 mh->set_highest_comp_level(comp_level);
1005 }
1006
1007 OrderAccess::storestore();
1008 #ifdef SHARK
1009 mh->_from_interpreted_entry = code->insts_begin();
1010 #else //!SHARK
1011 mh->_from_compiled_entry = code->verified_entry_point();
1012 OrderAccess::storestore();
1013 // Instantly compiled code can execute.
1014 if (!mh->is_method_handle_intrinsic())
1015 mh->_from_interpreted_entry = mh->get_i2c_entry();
1016 #endif //!SHARK
1017 }
1018
1019
1020 bool Method::is_overridden_in(Klass* k) const {
1021 InstanceKlass* ik = InstanceKlass::cast(k);
1022
1023 if (ik->is_interface()) return false;
1024
1025 // If method is an interface, we skip it - except if it
1026 // is a miranda method
1027 if (method_holder()->is_interface()) {
1028 // Check that method is not a miranda method
1029 if (ik->lookup_method(name(), signature()) == NULL) {
1030 // No implementation exist - so miranda method
1031 return false;
1032 }
1033 return true;
1034 }
1035
1036 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1037 assert(ik->vtable() != NULL, "vtable should exist");
1038 if (!has_vtable_index()) {
1039 return false;
1040 } else {
1041 Method* vt_m = ik->method_at_vtable(vtable_index());
1042 return vt_m != this;
1043 }
1044 }
1045
1046
1047 // give advice about whether this Method* should be cached or not
1048 bool Method::should_not_be_cached() const {
1049 if (is_old()) {
1050 // This method has been redefined. It is either EMCP or obsolete
1051 // and we don't want to cache it because that would pin the method
1052 // down and prevent it from being collectible if and when it
1053 // finishes executing.
1054 return true;
1055 }
1056
1057 // caching this method should be just fine
1058 return false;
1059 }
1060
1061
1062 /**
1063 * Returns true if this is one of the specially treated methods for
1064 * security related stack walks (like Reflection.getCallerClass).
1065 */
1066 bool Method::is_ignored_by_security_stack_walk() const {
1067 if (intrinsic_id() == vmIntrinsics::_invoke) {
1068 // This is Method.invoke() -- ignore it
1069 return true;
1070 }
1071 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1072 // This is an auxilary frame -- ignore it
1073 return true;
1074 }
1075 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1076 // This is an internal adapter frame for method handles -- ignore it
1077 return true;
1078 }
1079 return false;
1080 }
1081
1082
1083 // Constant pool structure for invoke methods:
1084 enum {
1085 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1086 _imcp_invoke_signature, // utf8: (variable Symbol*)
1087 _imcp_limit
1088 };
1089
1090 // Test if this method is an MH adapter frame generated by Java code.
1091 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1092 bool Method::is_compiled_lambda_form() const {
1093 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1094 }
1095
1096 // Test if this method is an internal MH primitive method.
1097 bool Method::is_method_handle_intrinsic() const {
1098 vmIntrinsics::ID iid = intrinsic_id();
1099 return (MethodHandles::is_signature_polymorphic(iid) &&
1100 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1101 }
1102
1103 bool Method::has_member_arg() const {
1104 vmIntrinsics::ID iid = intrinsic_id();
1105 return (MethodHandles::is_signature_polymorphic(iid) &&
1106 MethodHandles::has_member_arg(iid));
1107 }
1108
1109 // Make an instance of a signature-polymorphic internal MH primitive.
1110 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1111 Symbol* signature,
1112 TRAPS) {
1113 ResourceMark rm;
1114 methodHandle empty;
1115
1116 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1117 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1118 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1119 if (TraceMethodHandles) {
1120 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1121 }
1122
1123 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1124 name->increment_refcount();
1125 signature->increment_refcount();
1126
1127 int cp_length = _imcp_limit;
1128 ClassLoaderData* loader_data = holder->class_loader_data();
1129 constantPoolHandle cp;
1130 {
1131 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1132 cp = constantPoolHandle(THREAD, cp_oop);
1133 }
1134 cp->set_pool_holder(InstanceKlass::cast(holder()));
1135 cp->symbol_at_put(_imcp_invoke_name, name);
1136 cp->symbol_at_put(_imcp_invoke_signature, signature);
1137 cp->set_has_preresolution();
1138
1139 // decide on access bits: public or not?
1140 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1141 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1142 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1143 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1144
1145 methodHandle m;
1146 {
1147 InlineTableSizes sizes;
1148 Method* m_oop = Method::allocate(loader_data, 0,
1149 accessFlags_from(flags_bits), &sizes,
1150 ConstMethod::NORMAL, CHECK_(empty));
1151 m = methodHandle(THREAD, m_oop);
1152 }
1153 m->set_constants(cp());
1154 m->set_name_index(_imcp_invoke_name);
1155 m->set_signature_index(_imcp_invoke_signature);
1156 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1157 assert(m->signature() == signature, "");
1158 #ifdef CC_INTERP
1159 ResultTypeFinder rtf(signature);
1160 m->set_result_index(rtf.type());
1161 #endif
1162 m->compute_size_of_parameters(THREAD);
1163 m->init_intrinsic_id();
1164 assert(m->is_method_handle_intrinsic(), "");
1165 #ifdef ASSERT
1166 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1167 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1168 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1169 #endif //ASSERT
1170
1171 // Finally, set up its entry points.
1172 assert(m->can_be_statically_bound(), "");
1173 m->set_vtable_index(Method::nonvirtual_vtable_index);
1174 m->link_method(m, CHECK_(empty));
1175
1176 if (TraceMethodHandles && (Verbose || WizardMode))
1177 m->print_on(tty);
1178
1179 return m;
1180 }
1181
1182 Klass* Method::check_non_bcp_klass(Klass* klass) {
1183 if (klass != NULL && klass->class_loader() != NULL) {
1184 if (klass->oop_is_objArray())
1185 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1186 return klass;
1187 }
1188 return NULL;
1189 }
1190
1191
1192 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1193 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1194 // Code below does not work for native methods - they should never get rewritten anyway
1195 assert(!m->is_native(), "cannot rewrite native methods");
1196 // Allocate new Method*
1197 AccessFlags flags = m->access_flags();
1198
1199 ConstMethod* cm = m->constMethod();
1200 int checked_exceptions_len = cm->checked_exceptions_length();
1201 int localvariable_len = cm->localvariable_table_length();
1202 int exception_table_len = cm->exception_table_length();
1203 int method_parameters_len = cm->method_parameters_length();
1204 int method_annotations_len = cm->method_annotations_length();
1205 int parameter_annotations_len = cm->parameter_annotations_length();
1206 int type_annotations_len = cm->type_annotations_length();
1207 int default_annotations_len = cm->default_annotations_length();
1208
1209 InlineTableSizes sizes(
1210 localvariable_len,
1211 new_compressed_linenumber_size,
1212 exception_table_len,
1213 checked_exceptions_len,
1214 method_parameters_len,
1215 cm->generic_signature_index(),
1216 method_annotations_len,
1217 parameter_annotations_len,
1218 type_annotations_len,
1219 default_annotations_len,
1220 0);
1221
1222 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1223 Method* newm_oop = Method::allocate(loader_data,
1224 new_code_length,
1225 flags,
1226 &sizes,
1227 m->method_type(),
1228 CHECK_(methodHandle()));
1229 methodHandle newm (THREAD, newm_oop);
1230 int new_method_size = newm->method_size();
1231
1232 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1233 ConstMethod* newcm = newm->constMethod();
1234 int new_const_method_size = newm->constMethod()->size();
1235
1236 memcpy(newm(), m(), sizeof(Method));
1237
1238 // Create shallow copy of ConstMethod.
1239 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1240
1241 // Reset correct method/const method, method size, and parameter info
1242 newm->set_constMethod(newcm);
1243 newm->constMethod()->set_code_size(new_code_length);
1244 newm->constMethod()->set_constMethod_size(new_const_method_size);
1245 newm->set_method_size(new_method_size);
1246 assert(newm->code_size() == new_code_length, "check");
1247 assert(newm->method_parameters_length() == method_parameters_len, "check");
1248 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1249 assert(newm->exception_table_length() == exception_table_len, "check");
1250 assert(newm->localvariable_table_length() == localvariable_len, "check");
1251 // Copy new byte codes
1252 memcpy(newm->code_base(), new_code, new_code_length);
1253 // Copy line number table
1254 if (new_compressed_linenumber_size > 0) {
1255 memcpy(newm->compressed_linenumber_table(),
1256 new_compressed_linenumber_table,
1257 new_compressed_linenumber_size);
1258 }
1259 // Copy method_parameters
1260 if (method_parameters_len > 0) {
1261 memcpy(newm->method_parameters_start(),
1262 m->method_parameters_start(),
1263 method_parameters_len * sizeof(MethodParametersElement));
1264 }
1265 // Copy checked_exceptions
1266 if (checked_exceptions_len > 0) {
1267 memcpy(newm->checked_exceptions_start(),
1268 m->checked_exceptions_start(),
1269 checked_exceptions_len * sizeof(CheckedExceptionElement));
1270 }
1271 // Copy exception table
1272 if (exception_table_len > 0) {
1273 memcpy(newm->exception_table_start(),
1274 m->exception_table_start(),
1275 exception_table_len * sizeof(ExceptionTableElement));
1276 }
1277 // Copy local variable number table
1278 if (localvariable_len > 0) {
1279 memcpy(newm->localvariable_table_start(),
1280 m->localvariable_table_start(),
1281 localvariable_len * sizeof(LocalVariableTableElement));
1282 }
1283 // Copy stackmap table
1284 if (m->has_stackmap_table()) {
1285 int code_attribute_length = m->stackmap_data()->length();
1286 Array<u1>* stackmap_data =
1287 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1288 memcpy((void*)stackmap_data->adr_at(0),
1289 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1290 newm->set_stackmap_data(stackmap_data);
1291 }
1292
1293 // copy annotations over to new method
1294 newcm->copy_annotations_from(cm);
1295 return newm;
1296 }
1297
1298 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1299 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1300 // because we are not loading from core libraries
1301 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1302 // which does not use the class default class loader so we check for its loader here
1303 InstanceKlass* ik = InstanceKlass::cast(holder);
1304 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) {
1305 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1306 }
1307
1308 // see if the klass name is well-known:
1309 Symbol* klass_name = ik->name();
1310 return vmSymbols::find_sid(klass_name);
1311 }
1312
1313 void Method::init_intrinsic_id() {
1314 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1315 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1316 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1317 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1318
1319 // the klass name is well-known:
1320 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1321 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1322
1323 // ditto for method and signature:
1324 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1325 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1326 && name_id == vmSymbols::NO_SID)
1327 return;
1328 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1329 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1330 && sig_id == vmSymbols::NO_SID) return;
1331 jshort flags = access_flags().as_short();
1332
1333 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1334 if (id != vmIntrinsics::_none) {
1335 set_intrinsic_id(id);
1336 if (id == vmIntrinsics::_Class_cast) {
1337 // Even if the intrinsic is rejected, we want to inline this simple method.
1338 set_force_inline(true);
1339 }
1340 return;
1341 }
1342
1343 // A few slightly irregular cases:
1344 switch (klass_id) {
1345 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1346 // Second chance: check in regular Math.
1347 switch (name_id) {
1348 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1349 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1350 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1351 // pretend it is the corresponding method in the non-strict class:
1352 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1353 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1354 break;
1355 }
1356 break;
1357
1358 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1359 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1360 if (!is_native()) break;
1361 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1362 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1363 id = vmIntrinsics::_none;
1364 break;
1365 }
1366
1367 if (id != vmIntrinsics::_none) {
1368 // Set up its iid. It is an alias method.
1369 set_intrinsic_id(id);
1370 return;
1371 }
1372 }
1373
1374 // These two methods are static since a GC may move the Method
1375 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1376 if (THREAD->is_Compiler_thread()) {
1377 // There is nothing useful this routine can do from within the Compile thread.
1378 // Hopefully, the signature contains only well-known classes.
1379 // We could scan for this and return true/false, but the caller won't care.
1380 return false;
1381 }
1382 bool sig_is_loaded = true;
1383 Handle class_loader(THREAD, m->method_holder()->class_loader());
1384 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1385 ResourceMark rm(THREAD);
1386 Symbol* signature = m->signature();
1387 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1388 if (ss.is_object()) {
1389 Symbol* sym = ss.as_symbol(CHECK_(false));
1390 Symbol* name = sym;
1391 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1392 protection_domain, THREAD);
1393 // We are loading classes eagerly. If a ClassNotFoundException or
1394 // a LinkageError was generated, be sure to ignore it.
1395 if (HAS_PENDING_EXCEPTION) {
1396 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1397 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1398 CLEAR_PENDING_EXCEPTION;
1399 } else {
1400 return false;
1401 }
1402 }
1403 if( klass == NULL) { sig_is_loaded = false; }
1404 }
1405 }
1406 return sig_is_loaded;
1407 }
1408
1409 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1410 Handle class_loader(THREAD, m->method_holder()->class_loader());
1411 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1412 ResourceMark rm(THREAD);
1413 Symbol* signature = m->signature();
1414 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1415 if (ss.type() == T_OBJECT) {
1416 Symbol* name = ss.as_symbol_or_null();
1417 if (name == NULL) return true;
1418 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1419 if (klass == NULL) return true;
1420 }
1421 }
1422 return false;
1423 }
1424
1425 // Exposed so field engineers can debug VM
1426 void Method::print_short_name(outputStream* st) {
1427 ResourceMark rm;
1428 #ifdef PRODUCT
1429 st->print(" %s::", method_holder()->external_name());
1430 #else
1431 st->print(" %s::", method_holder()->internal_name());
1432 #endif
1433 name()->print_symbol_on(st);
1434 if (WizardMode) signature()->print_symbol_on(st);
1435 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1436 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1437 }
1438
1439 // Comparer for sorting an object array containing
1440 // Method*s.
1441 static int method_comparator(Method* a, Method* b) {
1442 return a->name()->fast_compare(b->name());
1443 }
1444
1445 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1446 // default_methods also uses this without the ordering for fast find_method
1447 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1448 int length = methods->length();
1449 if (length > 1) {
1450 {
1451 No_Safepoint_Verifier nsv;
1452 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1453 }
1454 // Reset method ordering
1455 if (set_idnums) {
1456 for (int i = 0; i < length; i++) {
1457 Method* m = methods->at(i);
1458 m->set_method_idnum(i);
1459 m->set_orig_method_idnum(i);
1460 }
1461 }
1462 }
1463 }
1464
1465 //-----------------------------------------------------------------------------------
1466 // Non-product code unless JVM/TI needs it
1467
1468 #if !defined(PRODUCT) || INCLUDE_JVMTI
1469 class SignatureTypePrinter : public SignatureTypeNames {
1470 private:
1471 outputStream* _st;
1472 bool _use_separator;
1473
1474 void type_name(const char* name) {
1475 if (_use_separator) _st->print(", ");
1476 _st->print("%s", name);
1477 _use_separator = true;
1478 }
1479
1480 public:
1481 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1482 _st = st;
1483 _use_separator = false;
1484 }
1485
1486 void print_parameters() { _use_separator = false; iterate_parameters(); }
1487 void print_returntype() { _use_separator = false; iterate_returntype(); }
1488 };
1489
1490
1491 void Method::print_name(outputStream* st) {
1492 Thread *thread = Thread::current();
1493 ResourceMark rm(thread);
1494 SignatureTypePrinter sig(signature(), st);
1495 st->print("%s ", is_static() ? "static" : "virtual");
1496 sig.print_returntype();
1497 st->print(" %s.", method_holder()->internal_name());
1498 name()->print_symbol_on(st);
1499 st->print("(");
1500 sig.print_parameters();
1501 st->print(")");
1502 }
1503 #endif // !PRODUCT || INCLUDE_JVMTI
1504
1505
1506 void Method::print_codes_on(outputStream* st) const {
1507 print_codes_on(0, code_size(), st);
1508 }
1509
1510 void Method::print_codes_on(int from, int to, outputStream* st) const {
1511 Thread *thread = Thread::current();
1512 ResourceMark rm(thread);
1513 methodHandle mh (thread, (Method*)this);
1514 BytecodeStream s(mh);
1515 s.set_interval(from, to);
1516 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1517 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1518 }
1519
1520
1521 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1522 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1523 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1524 // as end-of-stream terminator.
1525
1526 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1527 // bci and line number does not compress into single byte.
1528 // Write out escape character and use regular compression for bci and line number.
1529 write_byte((jubyte)0xFF);
1530 write_signed_int(bci_delta);
1531 write_signed_int(line_delta);
1532 }
1533
1534 // See comment in method.hpp which explains why this exists.
1535 #if defined(_M_AMD64) && _MSC_VER >= 1400
1536 #pragma optimize("", off)
1537 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1538 write_pair_inline(bci, line);
1539 }
1540 #pragma optimize("", on)
1541 #endif
1542
1543 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1544 _bci = 0;
1545 _line = 0;
1546 };
1547
1548
1549 bool CompressedLineNumberReadStream::read_pair() {
1550 jubyte next = read_byte();
1551 // Check for terminator
1552 if (next == 0) return false;
1553 if (next == 0xFF) {
1554 // Escape character, regular compression used
1555 _bci += read_signed_int();
1556 _line += read_signed_int();
1557 } else {
1558 // Single byte compression used
1559 _bci += next >> 3;
1560 _line += next & 0x7;
1561 }
1562 return true;
1563 }
1564
1565
1566 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1567 BreakpointInfo* bp = method_holder()->breakpoints();
1568 for (; bp != NULL; bp = bp->next()) {
1569 if (bp->match(this, bci)) {
1570 return bp->orig_bytecode();
1571 }
1572 }
1573 {
1574 ResourceMark rm;
1575 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1576 }
1577 return Bytecodes::_shouldnotreachhere;
1578 }
1579
1580 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1581 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1582 BreakpointInfo* bp = method_holder()->breakpoints();
1583 for (; bp != NULL; bp = bp->next()) {
1584 if (bp->match(this, bci)) {
1585 bp->set_orig_bytecode(code);
1586 // and continue, in case there is more than one
1587 }
1588 }
1589 }
1590
1591 void Method::set_breakpoint(int bci) {
1592 InstanceKlass* ik = method_holder();
1593 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1594 bp->set_next(ik->breakpoints());
1595 ik->set_breakpoints(bp);
1596 // do this last:
1597 bp->set(this);
1598 }
1599
1600 static void clear_matches(Method* m, int bci) {
1601 InstanceKlass* ik = m->method_holder();
1602 BreakpointInfo* prev_bp = NULL;
1603 BreakpointInfo* next_bp;
1604 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1605 next_bp = bp->next();
1606 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1607 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1608 // do this first:
1609 bp->clear(m);
1610 // unhook it
1611 if (prev_bp != NULL)
1612 prev_bp->set_next(next_bp);
1613 else
1614 ik->set_breakpoints(next_bp);
1615 delete bp;
1616 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1617 // at same location. So we have multiple matching (method_index and bci)
1618 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1619 // breakpoint for clear_breakpoint request and keep all other method versions
1620 // BreakpointInfo for future clear_breakpoint request.
1621 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1622 // which is being called when class is unloaded. We delete all the Breakpoint
1623 // information for all versions of method. We may not correctly restore the original
1624 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1625 // so these methods won't be used anymore.
1626 if (bci >= 0) {
1627 break;
1628 }
1629 } else {
1630 // This one is a keeper.
1631 prev_bp = bp;
1632 }
1633 }
1634 }
1635
1636 void Method::clear_breakpoint(int bci) {
1637 assert(bci >= 0, "");
1638 clear_matches(this, bci);
1639 }
1640
1641 void Method::clear_all_breakpoints() {
1642 clear_matches(this, -1);
1643 }
1644
1645
1646 int Method::invocation_count() {
1647 MethodCounters *mcs = method_counters();
1648 if (TieredCompilation) {
1649 MethodData* const mdo = method_data();
1650 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1651 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1652 return InvocationCounter::count_limit;
1653 } else {
1654 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1655 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1656 }
1657 } else {
1658 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1659 }
1660 }
1661
1662 int Method::backedge_count() {
1663 MethodCounters *mcs = method_counters();
1664 if (TieredCompilation) {
1665 MethodData* const mdo = method_data();
1666 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1667 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1668 return InvocationCounter::count_limit;
1669 } else {
1670 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1671 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1672 }
1673 } else {
1674 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1675 }
1676 }
1677
1678 int Method::highest_comp_level() const {
1679 const MethodCounters* mcs = method_counters();
1680 if (mcs != NULL) {
1681 return mcs->highest_comp_level();
1682 } else {
1683 return CompLevel_none;
1684 }
1685 }
1686
1687 int Method::highest_osr_comp_level() const {
1688 const MethodCounters* mcs = method_counters();
1689 if (mcs != NULL) {
1690 return mcs->highest_osr_comp_level();
1691 } else {
1692 return CompLevel_none;
1693 }
1694 }
1695
1696 void Method::set_highest_comp_level(int level) {
1697 MethodCounters* mcs = method_counters();
1698 if (mcs != NULL) {
1699 mcs->set_highest_comp_level(level);
1700 }
1701 }
1702
1703 void Method::set_highest_osr_comp_level(int level) {
1704 MethodCounters* mcs = method_counters();
1705 if (mcs != NULL) {
1706 mcs->set_highest_osr_comp_level(level);
1707 }
1708 }
1709
1710 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1711 _bci = bci;
1712 _name_index = m->name_index();
1713 _signature_index = m->signature_index();
1714 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1715 if (_orig_bytecode == Bytecodes::_breakpoint)
1716 _orig_bytecode = m->orig_bytecode_at(_bci);
1717 _next = NULL;
1718 }
1719
1720 void BreakpointInfo::set(Method* method) {
1721 #ifdef ASSERT
1722 {
1723 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1724 if (code == Bytecodes::_breakpoint)
1725 code = method->orig_bytecode_at(_bci);
1726 assert(orig_bytecode() == code, "original bytecode must be the same");
1727 }
1728 #endif
1729 Thread *thread = Thread::current();
1730 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1731 method->incr_number_of_breakpoints(thread);
1732 SystemDictionary::notice_modification();
1733 {
1734 // Deoptimize all dependents on this method
1735 HandleMark hm(thread);
1736 methodHandle mh(thread, method);
1737 CodeCache::flush_dependents_on_method(mh);
1738 }
1739 }
1740
1741 void BreakpointInfo::clear(Method* method) {
1742 *method->bcp_from(_bci) = orig_bytecode();
1743 assert(method->number_of_breakpoints() > 0, "must not go negative");
1744 method->decr_number_of_breakpoints(Thread::current());
1745 }
1746
1747 // jmethodID handling
1748
1749 // This is a block allocating object, sort of like JNIHandleBlock, only a
1750 // lot simpler.
1751 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1752 // never get rid of it.
1753
1754 static const int min_block_size = 8;
1755
1756 class JNIMethodBlockNode : public CHeapObj<mtClass> {
1757 friend class JNIMethodBlock;
1758 Method** _methods;
1759 int _number_of_methods;
1760 int _top;
1761 JNIMethodBlockNode* _next;
1762
1763 public:
1764
1765 JNIMethodBlockNode(int num_methods = min_block_size);
1766
1767 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
1768
1769 void ensure_methods(int num_addl_methods) {
1770 if (_top < _number_of_methods) {
1771 num_addl_methods -= _number_of_methods - _top;
1772 if (num_addl_methods <= 0) {
1773 return;
1774 }
1775 }
1776 if (_next == NULL) {
1777 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
1778 } else {
1779 _next->ensure_methods(num_addl_methods);
1780 }
1781 }
1782 };
1783
1784 class JNIMethodBlock : public CHeapObj<mtClass> {
1785 JNIMethodBlockNode _head;
1786 JNIMethodBlockNode *_last_free;
1787 public:
1788 static Method* const _free_method;
1789
1790 JNIMethodBlock(int initial_capacity = min_block_size)
1791 : _head(initial_capacity), _last_free(&_head) {}
1792
1793 void ensure_methods(int num_addl_methods) {
1794 _last_free->ensure_methods(num_addl_methods);
1795 }
1796
1797 Method** add_method(Method* m) {
1798 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) {
1799 if (b->_top < b->_number_of_methods) {
1800 // top points to the next free entry.
1801 int i = b->_top;
1802 b->_methods[i] = m;
1803 b->_top++;
1804 _last_free = b;
1805 return &(b->_methods[i]);
1806 } else if (b->_top == b->_number_of_methods) {
1807 // if the next free entry ran off the block see if there's a free entry
1808 for (int i = 0; i < b->_number_of_methods; i++) {
1809 if (b->_methods[i] == _free_method) {
1810 b->_methods[i] = m;
1811 _last_free = b;
1812 return &(b->_methods[i]);
1813 }
1814 }
1815 // Only check each block once for frees. They're very unlikely.
1816 // Increment top past the end of the block.
1817 b->_top++;
1818 }
1819 // need to allocate a next block.
1820 if (b->_next == NULL) {
1821 b->_next = _last_free = new JNIMethodBlockNode();
1822 }
1823 }
1824 guarantee(false, "Should always allocate a free block");
1825 return NULL;
1826 }
1827
1828 bool contains(Method** m) {
1829 if (m == NULL) return false;
1830 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
1831 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
1832 // This is a bit of extra checking, for two reasons. One is
1833 // that contains() deals with pointers that are passed in by
1834 // JNI code, so making sure that the pointer is aligned
1835 // correctly is valuable. The other is that <= and > are
1836 // technically not defined on pointers, so the if guard can
1837 // pass spuriously; no modern compiler is likely to make that
1838 // a problem, though (and if one did, the guard could also
1839 // fail spuriously, which would be bad).
1840 ptrdiff_t idx = m - b->_methods;
1841 if (b->_methods + idx == m) {
1842 return true;
1843 }
1844 }
1845 }
1846 return false; // not found
1847 }
1848
1849 // Doesn't really destroy it, just marks it as free so it can be reused.
1850 void destroy_method(Method** m) {
1851 #ifdef ASSERT
1852 assert(contains(m), "should be a methodID");
1853 #endif // ASSERT
1854 *m = _free_method;
1855 }
1856
1857 // During class unloading the methods are cleared, which is different
1858 // than freed.
1859 void clear_all_methods() {
1860 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
1861 for (int i = 0; i< b->_number_of_methods; i++) {
1862 b->_methods[i] = NULL;
1863 }
1864 }
1865 }
1866 #ifndef PRODUCT
1867 int count_methods() {
1868 // count all allocated methods
1869 int count = 0;
1870 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
1871 for (int i = 0; i< b->_number_of_methods; i++) {
1872 if (b->_methods[i] != _free_method) count++;
1873 }
1874 }
1875 return count;
1876 }
1877 #endif // PRODUCT
1878 };
1879
1880 // Something that can't be mistaken for an address or a markOop
1881 Method* const JNIMethodBlock::_free_method = (Method*)55;
1882
1883 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) {
1884 _number_of_methods = MAX2(num_methods, min_block_size);
1885 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
1886 for (int i = 0; i < _number_of_methods; i++) {
1887 _methods[i] = JNIMethodBlock::_free_method;
1888 }
1889 }
1890
1891 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
1892 ClassLoaderData* cld = loader_data;
1893 if (!SafepointSynchronize::is_at_safepoint()) {
1894 // Have to add jmethod_ids() to class loader data thread-safely.
1895 // Also have to add the method to the list safely, which the cld lock
1896 // protects as well.
1897 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1898 if (cld->jmethod_ids() == NULL) {
1899 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
1900 } else {
1901 cld->jmethod_ids()->ensure_methods(capacity);
1902 }
1903 } else {
1904 // At safepoint, we are single threaded and can set this.
1905 if (cld->jmethod_ids() == NULL) {
1906 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
1907 } else {
1908 cld->jmethod_ids()->ensure_methods(capacity);
1909 }
1910 }
1911 }
1912
1913 // Add a method id to the jmethod_ids
1914 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
1915 ClassLoaderData* cld = loader_data;
1916
1917 if (!SafepointSynchronize::is_at_safepoint()) {
1918 // Have to add jmethod_ids() to class loader data thread-safely.
1919 // Also have to add the method to the list safely, which the cld lock
1920 // protects as well.
1921 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1922 if (cld->jmethod_ids() == NULL) {
1923 cld->set_jmethod_ids(new JNIMethodBlock());
1924 }
1925 // jmethodID is a pointer to Method*
1926 return (jmethodID)cld->jmethod_ids()->add_method(m);
1927 } else {
1928 // At safepoint, we are single threaded and can set this.
1929 if (cld->jmethod_ids() == NULL) {
1930 cld->set_jmethod_ids(new JNIMethodBlock());
1931 }
1932 // jmethodID is a pointer to Method*
1933 return (jmethodID)cld->jmethod_ids()->add_method(m);
1934 }
1935 }
1936
1937 // Mark a jmethodID as free. This is called when there is a data race in
1938 // InstanceKlass while creating the jmethodID cache.
1939 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
1940 ClassLoaderData* cld = loader_data;
1941 Method** ptr = (Method**)m;
1942 assert(cld->jmethod_ids() != NULL, "should have method handles");
1943 cld->jmethod_ids()->destroy_method(ptr);
1944 }
1945
1946 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
1947 // Can't assert the method_holder is the same because the new method has the
1948 // scratch method holder.
1949 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
1950 == new_method->method_holder()->class_loader(),
1951 "changing to a different class loader");
1952 // Just change the method in place, jmethodID pointer doesn't change.
1953 *((Method**)jmid) = new_method;
1954 }
1955
1956 bool Method::is_method_id(jmethodID mid) {
1957 Method* m = resolve_jmethod_id(mid);
1958 assert(m != NULL, "should be called with non-null method");
1959 InstanceKlass* ik = m->method_holder();
1960 ClassLoaderData* cld = ik->class_loader_data();
1961 if (cld->jmethod_ids() == NULL) return false;
1962 return (cld->jmethod_ids()->contains((Method**)mid));
1963 }
1964
1965 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
1966 if (mid == NULL) return NULL;
1967 Method* o = resolve_jmethod_id(mid);
1968 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
1969 return NULL;
1970 }
1971 return o;
1972 };
1973
1974 void Method::set_on_stack(const bool value) {
1975 // Set both the method itself and its constant pool. The constant pool
1976 // on stack means some method referring to it is also on the stack.
1977 constants()->set_on_stack(value);
1978
1979 bool already_set = on_stack();
1980 _access_flags.set_on_stack(value);
1981 if (value && !already_set) {
1982 MetadataOnStackMark::record(this);
1983 }
1984 }
1985
1986 // Called when the class loader is unloaded to make all methods weak.
1987 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1988 loader_data->jmethod_ids()->clear_all_methods();
1989 }
1990
1991 bool Method::has_method_vptr(const void* ptr) {
1992 Method m;
1993 // This assumes that the vtbl pointer is the first word of a C++ object.
1994 // This assumption is also in universe.cpp patch_klass_vtble
1995 void* vtbl2 = dereference_vptr((const void*)&m);
1996 void* this_vtbl = dereference_vptr(ptr);
1997 return vtbl2 == this_vtbl;
1998 }
1999
2000 // Check that this pointer is valid by checking that the vtbl pointer matches
2001 bool Method::is_valid_method() const {
2002 if (this == NULL) {
2003 return false;
2004 } else if (!is_metaspace_object()) {
2005 return false;
2006 } else {
2007 return has_method_vptr((const void*)this);
2008 }
2009 }
2010
2011 #ifndef PRODUCT
2012 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
2013 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
2014 }
2015 #endif // PRODUCT
2016
2017
2018 // Printing
2019
2020 #ifndef PRODUCT
2021
2022 void Method::print_on(outputStream* st) const {
2023 ResourceMark rm;
2024 assert(is_method(), "must be method");
2025 st->print_cr("%s", internal_name());
2026 // get the effect of PrintOopAddress, always, for methods:
2027 st->print_cr(" - this oop: " INTPTR_FORMAT, (intptr_t)this);
2028 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2029 st->print (" - constants: " INTPTR_FORMAT " ", (address)constants());
2030 constants()->print_value_on(st); st->cr();
2031 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2032 st->print (" - name: "); name()->print_value_on(st); st->cr();
2033 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2034 st->print_cr(" - max stack: %d", max_stack());
2035 st->print_cr(" - max locals: %d", max_locals());
2036 st->print_cr(" - size of params: %d", size_of_parameters());
2037 st->print_cr(" - method size: %d", method_size());
2038 if (intrinsic_id() != vmIntrinsics::_none)
2039 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
2040 if (highest_comp_level() != CompLevel_none)
2041 st->print_cr(" - highest level: %d", highest_comp_level());
2042 st->print_cr(" - vtable index: %d", _vtable_index);
2043 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
2044 st->print( " - adapters: ");
2045 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2046 if (a == NULL)
2047 st->print_cr(INTPTR_FORMAT, a);
2048 else
2049 a->print_adapter_on(st);
2050 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
2051 st->print_cr(" - code size: %d", code_size());
2052 if (code_size() != 0) {
2053 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
2054 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
2055 }
2056 if (method_data() != NULL) {
2057 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
2058 }
2059 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2060 if (checked_exceptions_length() > 0) {
2061 CheckedExceptionElement* table = checked_exceptions_start();
2062 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
2063 if (Verbose) {
2064 for (int i = 0; i < checked_exceptions_length(); i++) {
2065 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2066 }
2067 }
2068 }
2069 if (has_linenumber_table()) {
2070 u_char* table = compressed_linenumber_table();
2071 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
2072 if (Verbose) {
2073 CompressedLineNumberReadStream stream(table);
2074 while (stream.read_pair()) {
2075 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2076 }
2077 }
2078 }
2079 st->print_cr(" - localvar length: %d", localvariable_table_length());
2080 if (localvariable_table_length() > 0) {
2081 LocalVariableTableElement* table = localvariable_table_start();
2082 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
2083 if (Verbose) {
2084 for (int i = 0; i < localvariable_table_length(); i++) {
2085 int bci = table[i].start_bci;
2086 int len = table[i].length;
2087 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2088 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2089 int slot = table[i].slot;
2090 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2091 }
2092 }
2093 }
2094 if (code() != NULL) {
2095 st->print (" - compiled code: ");
2096 code()->print_value_on(st);
2097 }
2098 if (is_native()) {
2099 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
2100 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
2101 }
2102 }
2103
2104 #endif //PRODUCT
2105
2106 void Method::print_value_on(outputStream* st) const {
2107 assert(is_method(), "must be method");
2108 st->print("%s", internal_name());
2109 print_address_on(st);
2110 st->print(" ");
2111 name()->print_value_on(st);
2112 st->print(" ");
2113 signature()->print_value_on(st);
2114 st->print(" in ");
2115 method_holder()->print_value_on(st);
2116 if (WizardMode) st->print("#%d", _vtable_index);
2117 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2118 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2119 }
2120
2121 #if INCLUDE_SERVICES
2122 // Size Statistics
2123 void Method::collect_statistics(KlassSizeStats *sz) const {
2124 int mysize = sz->count(this);
2125 sz->_method_bytes += mysize;
2126 sz->_method_all_bytes += mysize;
2127 sz->_rw_bytes += mysize;
2128
2129 if (constMethod()) {
2130 constMethod()->collect_statistics(sz);
2131 }
2132 if (method_data()) {
2133 method_data()->collect_statistics(sz);
2134 }
2135 }
2136 #endif // INCLUDE_SERVICES
2137
2138 // LogTouchedMethods and PrintTouchedMethods
2139
2140 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because
2141 // the Method may be garbage collected. Let's roll our own hash table.
2142 class TouchedMethodRecord : CHeapObj<mtTracing> {
2143 public:
2144 // It's OK to store Symbols here because they will NOT be GC'ed if
2145 // LogTouchedMethods is enabled.
2146 TouchedMethodRecord* _next;
2147 Symbol* _class_name;
2148 Symbol* _method_name;
2149 Symbol* _method_signature;
2150 };
2151
2152 static const int TOUCHED_METHOD_TABLE_SIZE = 20011;
2153 static TouchedMethodRecord** _touched_method_table = NULL;
2154
2155 void Method::log_touched(TRAPS) {
2156
2157 const int table_size = TOUCHED_METHOD_TABLE_SIZE;
2158 Symbol* my_class = klass_name();
2159 Symbol* my_name = name();
2160 Symbol* my_sig = signature();
2161
2162 unsigned int hash = my_class->identity_hash() +
2163 my_name->identity_hash() +
2164 my_sig->identity_hash();
2165 juint index = juint(hash) % table_size;
2166
2167 MutexLocker ml(TouchedMethodLog_lock, THREAD);
2168 if (_touched_method_table == NULL) {
2169 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size,
2170 mtTracing, CURRENT_PC);
2171 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size);
2172 }
2173
2174 TouchedMethodRecord* ptr = _touched_method_table[index];
2175 while (ptr) {
2176 if (ptr->_class_name == my_class &&
2177 ptr->_method_name == my_name &&
2178 ptr->_method_signature == my_sig) {
2179 return;
2180 }
2181 if (ptr->_next == NULL) break;
2182 ptr = ptr->_next;
2183 }
2184 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing);
2185 my_class->set_permanent(); // prevent reclaimed by GC
2186 my_name->set_permanent();
2187 my_sig->set_permanent();
2188 nptr->_class_name = my_class;
2189 nptr->_method_name = my_name;
2190 nptr->_method_signature = my_sig;
2191 nptr->_next = NULL;
2192
2193 if (ptr == NULL) {
2194 // first
2195 _touched_method_table[index] = nptr;
2196 } else {
2197 ptr->_next = nptr;
2198 }
2199 }
2200
2201 void Method::print_touched_methods(outputStream* out) {
2202 MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock);
2203 out->print_cr("# Method::print_touched_methods version 1");
2204 if (_touched_method_table) {
2205 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) {
2206 TouchedMethodRecord* ptr = _touched_method_table[i];
2207 while(ptr) {
2208 ptr->_class_name->print_symbol_on(out); out->print(".");
2209 ptr->_method_name->print_symbol_on(out); out->print(":");
2210 ptr->_method_signature->print_symbol_on(out); out->cr();
2211 ptr = ptr->_next;
2212 }
2213 }
2214 }
2215 }
2216
2217 // Verification
2218
2219 void Method::verify_on(outputStream* st) {
2220 guarantee(is_method(), "object must be method");
2221 guarantee(constants()->is_constantPool(), "should be constant pool");
2222 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2223 MethodData* md = method_data();
2224 guarantee(md == NULL ||
2225 md->is_methodData(), "should be method data");
2226 }