Fri, 05 Aug 2016 10:47:35 +0000
8161144: Fix for JDK-8147451 failed: Crash in Method::checked_resolve_jmethod_id(_jmethodID*)
Summary: Method::deallocate_contents() should clear 'this' from list of Methods in JNIMethodBlock, when class is unloaded.
Reviewed-by: coleenp, dholmes
1 /*
2 * Copyright (c) 1997, 2016, 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 */
25 #include "precompiled.hpp"
26 #include "classfile/metadataOnStackMark.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "code/debugInfoRec.hpp"
29 #include "gc_interface/collectedHeap.inline.hpp"
30 #include "interpreter/bytecodeStream.hpp"
31 #include "interpreter/bytecodeTracer.hpp"
32 #include "interpreter/bytecodes.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "interpreter/oopMapCache.hpp"
35 #include "memory/gcLocker.hpp"
36 #include "memory/generation.hpp"
37 #include "memory/heapInspection.hpp"
38 #include "memory/metadataFactory.hpp"
39 #include "memory/metaspaceShared.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "oops/constMethod.hpp"
42 #include "oops/methodData.hpp"
43 #include "oops/method.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"
60 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
62 // Implementation of Method
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);
78 int size = Method::size(access_flags.is_native());
80 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, size);
81 }
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 set_intrinsic_id(vmIntrinsics::_none);
89 set_jfr_towrite(false);
90 set_force_inline(false);
91 set_hidden(false);
92 set_dont_inline(false);
93 set_has_injected_profile(false);
94 set_method_data(NULL);
95 clear_method_counters();
96 set_vtable_index(Method::garbage_vtable_index);
98 // Fix and bury in Method*
99 set_interpreter_entry(NULL); // sets i2i entry and from_int
100 set_adapter_entry(NULL);
101 clear_code(); // from_c/from_i get set to c2i/i2i
103 if (access_flags.is_native()) {
104 clear_native_function();
105 set_signature_handler(NULL);
106 }
108 NOT_PRODUCT(set_compiled_invocation_count(0);)
109 }
111 // Release Method*. The nmethod will be gone when we get here because
112 // we've walked the code cache.
113 void Method::deallocate_contents(ClassLoaderData* loader_data) {
114 clear_jmethod_id(loader_data);
115 MetadataFactory::free_metadata(loader_data, constMethod());
116 set_constMethod(NULL);
117 MetadataFactory::free_metadata(loader_data, method_data());
118 set_method_data(NULL);
119 MetadataFactory::free_metadata(loader_data, method_counters());
120 clear_method_counters();
121 // The nmethod will be gone when we get here.
122 if (code() != NULL) _code = NULL;
123 }
125 address Method::get_i2c_entry() {
126 assert(_adapter != NULL, "must have");
127 return _adapter->get_i2c_entry();
128 }
130 address Method::get_c2i_entry() {
131 assert(_adapter != NULL, "must have");
132 return _adapter->get_c2i_entry();
133 }
135 address Method::get_c2i_unverified_entry() {
136 assert(_adapter != NULL, "must have");
137 return _adapter->get_c2i_unverified_entry();
138 }
140 char* Method::name_and_sig_as_C_string() const {
141 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
142 }
144 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
145 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
146 }
148 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
149 const char* klass_name = klass->external_name();
150 int klass_name_len = (int)strlen(klass_name);
151 int method_name_len = method_name->utf8_length();
152 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
153 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
154 strcpy(dest, klass_name);
155 dest[klass_name_len] = '.';
156 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
157 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
158 dest[len] = 0;
159 return dest;
160 }
162 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
163 Symbol* klass_name = klass->name();
164 klass_name->as_klass_external_name(buf, size);
165 int len = (int)strlen(buf);
167 if (len < size - 1) {
168 buf[len++] = '.';
170 method_name->as_C_string(&(buf[len]), size - len);
171 len = (int)strlen(buf);
173 signature->as_C_string(&(buf[len]), size - len);
174 }
176 return buf;
177 }
179 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) {
180 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
181 // access exception table
182 ExceptionTable table(mh());
183 int length = table.length();
184 // iterate through all entries sequentially
185 constantPoolHandle pool(THREAD, mh->constants());
186 for (int i = 0; i < length; i ++) {
187 //reacquire the table in case a GC happened
188 ExceptionTable table(mh());
189 int beg_bci = table.start_pc(i);
190 int end_bci = table.end_pc(i);
191 assert(beg_bci <= end_bci, "inconsistent exception table");
192 if (beg_bci <= throw_bci && throw_bci < end_bci) {
193 // exception handler bci range covers throw_bci => investigate further
194 int handler_bci = table.handler_pc(i);
195 int klass_index = table.catch_type_index(i);
196 if (klass_index == 0) {
197 return handler_bci;
198 } else if (ex_klass.is_null()) {
199 return handler_bci;
200 } else {
201 // we know the exception class => get the constraint class
202 // this may require loading of the constraint class; if verification
203 // fails or some other exception occurs, return handler_bci
204 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
205 KlassHandle klass = KlassHandle(THREAD, k);
206 assert(klass.not_null(), "klass not loaded");
207 if (ex_klass->is_subtype_of(klass())) {
208 return handler_bci;
209 }
210 }
211 }
212 }
214 return -1;
215 }
217 void Method::mask_for(int bci, InterpreterOopMap* mask) {
219 Thread* myThread = Thread::current();
220 methodHandle h_this(myThread, this);
221 #ifdef ASSERT
222 bool has_capability = myThread->is_VM_thread() ||
223 myThread->is_ConcurrentGC_thread() ||
224 myThread->is_GC_task_thread();
226 if (!has_capability) {
227 if (!VerifyStack && !VerifyLastFrame) {
228 // verify stack calls this outside VM thread
229 warning("oopmap should only be accessed by the "
230 "VM, GC task or CMS threads (or during debugging)");
231 InterpreterOopMap local_mask;
232 method_holder()->mask_for(h_this, bci, &local_mask);
233 local_mask.print();
234 }
235 }
236 #endif
237 method_holder()->mask_for(h_this, bci, mask);
238 return;
239 }
242 int Method::bci_from(address bcp) const {
243 #ifdef ASSERT
244 { ResourceMark rm;
245 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
246 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string()));
247 }
248 #endif
249 return bcp - code_base();
250 }
253 // Return (int)bcx if it appears to be a valid BCI.
254 // Return bci_from((address)bcx) if it appears to be a valid BCP.
255 // Return -1 otherwise.
256 // Used by profiling code, when invalid data is a possibility.
257 // The caller is responsible for validating the Method* itself.
258 int Method::validate_bci_from_bcx(intptr_t bcx) const {
259 // keep bci as -1 if not a valid bci
260 int bci = -1;
261 if (bcx == 0 || (address)bcx == code_base()) {
262 // code_size() may return 0 and we allow 0 here
263 // the method may be native
264 bci = 0;
265 } else if (frame::is_bci(bcx)) {
266 if (bcx < code_size()) {
267 bci = (int)bcx;
268 }
269 } else if (contains((address)bcx)) {
270 bci = (address)bcx - code_base();
271 }
272 // Assert that if we have dodged any asserts, bci is negative.
273 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
274 return bci;
275 }
277 address Method::bcp_from(int bci) const {
278 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), err_msg("illegal bci: %d", bci));
279 address bcp = code_base() + bci;
280 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
281 return bcp;
282 }
285 int Method::size(bool is_native) {
286 // If native, then include pointers for native_function and signature_handler
287 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
288 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
289 return align_object_size(header_size() + extra_words);
290 }
293 Symbol* Method::klass_name() const {
294 Klass* k = method_holder();
295 assert(k->is_klass(), "must be klass");
296 InstanceKlass* ik = (InstanceKlass*) k;
297 return ik->name();
298 }
301 // Attempt to return method oop to original state. Clear any pointers
302 // (to objects outside the shared spaces). We won't be able to predict
303 // where they should point in a new JVM. Further initialize some
304 // entries now in order allow them to be write protected later.
306 void Method::remove_unshareable_info() {
307 unlink_method();
308 }
310 void Method::set_vtable_index(int index) {
311 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
312 // At runtime initialize_vtable is rerun as part of link_class_impl()
313 // for a shared class loaded by the non-boot loader to obtain the loader
314 // constraints based on the runtime classloaders' context.
315 return; // don't write into the shared class
316 } else {
317 _vtable_index = index;
318 }
319 }
321 void Method::set_itable_index(int index) {
322 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
323 // At runtime initialize_itable is rerun as part of link_class_impl()
324 // for a shared class loaded by the non-boot loader to obtain the loader
325 // constraints based on the runtime classloaders' context. The dumptime
326 // itable index should be the same as the runtime index.
327 assert(_vtable_index == itable_index_max - index,
328 "archived itable index is different from runtime index");
329 return; // don’t write into the shared class
330 } else {
331 _vtable_index = itable_index_max - index;
332 }
333 assert(valid_itable_index(), "");
334 }
338 bool Method::was_executed_more_than(int n) {
339 // Invocation counter is reset when the Method* is compiled.
340 // If the method has compiled code we therefore assume it has
341 // be excuted more than n times.
342 if (is_accessor() || is_empty_method() || (code() != NULL)) {
343 // interpreter doesn't bump invocation counter of trivial methods
344 // compiler does not bump invocation counter of compiled methods
345 return true;
346 }
347 else if ((method_counters() != NULL &&
348 method_counters()->invocation_counter()->carry()) ||
349 (method_data() != NULL &&
350 method_data()->invocation_counter()->carry())) {
351 // The carry bit is set when the counter overflows and causes
352 // a compilation to occur. We don't know how many times
353 // the counter has been reset, so we simply assume it has
354 // been executed more than n times.
355 return true;
356 } else {
357 return invocation_count() > n;
358 }
359 }
361 #ifndef PRODUCT
362 void Method::print_invocation_count() {
363 if (is_static()) tty->print("static ");
364 if (is_final()) tty->print("final ");
365 if (is_synchronized()) tty->print("synchronized ");
366 if (is_native()) tty->print("native ");
367 method_holder()->name()->print_symbol_on(tty);
368 tty->print(".");
369 name()->print_symbol_on(tty);
370 signature()->print_symbol_on(tty);
372 if (WizardMode) {
373 // dump the size of the byte codes
374 tty->print(" {%d}", code_size());
375 }
376 tty->cr();
378 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
379 tty->print_cr (" invocation_counter: %8d ", invocation_count());
380 tty->print_cr (" backedge_counter: %8d ", backedge_count());
381 if (CountCompiledCalls) {
382 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
383 }
385 }
386 #endif
388 // Build a MethodData* object to hold information about this method
389 // collected in the interpreter.
390 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
391 // Do not profile method if current thread holds the pending list lock,
392 // which avoids deadlock for acquiring the MethodData_lock.
393 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
394 return;
395 }
397 // Grab a lock here to prevent multiple
398 // MethodData*s from being created.
399 MutexLocker ml(MethodData_lock, THREAD);
400 if (method->method_data() == NULL) {
401 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
402 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);
403 method->set_method_data(method_data);
404 if (PrintMethodData && (Verbose || WizardMode)) {
405 ResourceMark rm(THREAD);
406 tty->print("build_interpreter_method_data for ");
407 method->print_name(tty);
408 tty->cr();
409 // At the end of the run, the MDO, full of data, will be dumped.
410 }
411 }
412 }
414 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
415 methodHandle mh(m);
416 ClassLoaderData* loader_data = mh->method_holder()->class_loader_data();
417 MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL);
418 if (!mh->init_method_counters(counters)) {
419 MetadataFactory::free_metadata(loader_data, counters);
420 }
421 return mh->method_counters();
422 }
424 void Method::cleanup_inline_caches() {
425 // The current system doesn't use inline caches in the interpreter
426 // => nothing to do (keep this method around for future use)
427 }
430 int Method::extra_stack_words() {
431 // not an inline function, to avoid a header dependency on Interpreter
432 return extra_stack_entries() * Interpreter::stackElementSize;
433 }
436 void Method::compute_size_of_parameters(Thread *thread) {
437 ArgumentSizeComputer asc(signature());
438 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
439 }
441 BasicType Method::result_type() const {
442 ResultTypeFinder rtf(signature());
443 return rtf.type();
444 }
447 bool Method::is_empty_method() const {
448 return code_size() == 1
449 && *code_base() == Bytecodes::_return;
450 }
453 bool Method::is_vanilla_constructor() const {
454 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
455 // which only calls the superclass vanilla constructor and possibly does stores of
456 // zero constants to local fields:
457 //
458 // aload_0
459 // invokespecial
460 // indexbyte1
461 // indexbyte2
462 //
463 // followed by an (optional) sequence of:
464 //
465 // aload_0
466 // aconst_null / iconst_0 / fconst_0 / dconst_0
467 // putfield
468 // indexbyte1
469 // indexbyte2
470 //
471 // followed by:
472 //
473 // return
475 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
476 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
477 int size = code_size();
478 // Check if size match
479 if (size == 0 || size % 5 != 0) return false;
480 address cb = code_base();
481 int last = size - 1;
482 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
483 // Does not call superclass default constructor
484 return false;
485 }
486 // Check optional sequence
487 for (int i = 4; i < last; i += 5) {
488 if (cb[i] != Bytecodes::_aload_0) return false;
489 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
490 if (cb[i+2] != Bytecodes::_putfield) return false;
491 }
492 return true;
493 }
496 bool Method::compute_has_loops_flag() {
497 BytecodeStream bcs(this);
498 Bytecodes::Code bc;
500 while ((bc = bcs.next()) >= 0) {
501 switch( bc ) {
502 case Bytecodes::_ifeq:
503 case Bytecodes::_ifnull:
504 case Bytecodes::_iflt:
505 case Bytecodes::_ifle:
506 case Bytecodes::_ifne:
507 case Bytecodes::_ifnonnull:
508 case Bytecodes::_ifgt:
509 case Bytecodes::_ifge:
510 case Bytecodes::_if_icmpeq:
511 case Bytecodes::_if_icmpne:
512 case Bytecodes::_if_icmplt:
513 case Bytecodes::_if_icmpgt:
514 case Bytecodes::_if_icmple:
515 case Bytecodes::_if_icmpge:
516 case Bytecodes::_if_acmpeq:
517 case Bytecodes::_if_acmpne:
518 case Bytecodes::_goto:
519 case Bytecodes::_jsr:
520 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
521 break;
523 case Bytecodes::_goto_w:
524 case Bytecodes::_jsr_w:
525 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
526 break;
527 }
528 }
529 _access_flags.set_loops_flag_init();
530 return _access_flags.has_loops();
531 }
533 bool Method::is_final_method(AccessFlags class_access_flags) const {
534 // or "does_not_require_vtable_entry"
535 // default method or overpass can occur, is not final (reuses vtable entry)
536 // private methods get vtable entries for backward class compatibility.
537 if (is_overpass() || is_default_method()) return false;
538 return is_final() || class_access_flags.is_final();
539 }
541 bool Method::is_final_method() const {
542 return is_final_method(method_holder()->access_flags());
543 }
545 bool Method::is_default_method() const {
546 if (method_holder() != NULL &&
547 method_holder()->is_interface() &&
548 !is_abstract()) {
549 return true;
550 } else {
551 return false;
552 }
553 }
555 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
556 if (is_final_method(class_access_flags)) return true;
557 #ifdef ASSERT
558 ResourceMark rm;
559 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
560 if (class_access_flags.is_interface()) {
561 assert(is_nonv == is_static(), err_msg("is_nonv=%s", name_and_sig_as_C_string()));
562 }
563 #endif
564 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
565 return vtable_index() == nonvirtual_vtable_index;
566 }
568 bool Method::can_be_statically_bound() const {
569 return can_be_statically_bound(method_holder()->access_flags());
570 }
572 bool Method::is_accessor() const {
573 if (code_size() != 5) return false;
574 if (size_of_parameters() != 1) return false;
575 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
576 if (java_code_at(1) != Bytecodes::_getfield) return false;
577 if (java_code_at(4) != Bytecodes::_areturn &&
578 java_code_at(4) != Bytecodes::_ireturn ) return false;
579 return true;
580 }
582 bool Method::is_constant_getter() const {
583 int last_index = code_size() - 1;
584 // Check if the first 1-3 bytecodes are a constant push
585 // and the last bytecode is a return.
586 return (2 <= code_size() && code_size() <= 4 &&
587 Bytecodes::is_const(java_code_at(0)) &&
588 Bytecodes::length_for(java_code_at(0)) == last_index &&
589 Bytecodes::is_return(java_code_at(last_index)));
590 }
592 bool Method::is_initializer() const {
593 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
594 }
596 bool Method::has_valid_initializer_flags() const {
597 return (is_static() ||
598 method_holder()->major_version() < 51);
599 }
601 bool Method::is_static_initializer() const {
602 // For classfiles version 51 or greater, ensure that the clinit method is
603 // static. Non-static methods with the name "<clinit>" are not static
604 // initializers. (older classfiles exempted for backward compatibility)
605 return name() == vmSymbols::class_initializer_name() &&
606 has_valid_initializer_flags();
607 }
610 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) {
611 int length = this_oop->checked_exceptions_length();
612 if (length == 0) { // common case
613 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
614 } else {
615 methodHandle h_this(THREAD, this_oop);
616 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
617 objArrayHandle mirrors (THREAD, m_oop);
618 for (int i = 0; i < length; i++) {
619 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
620 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
621 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
622 mirrors->obj_at_put(i, k->java_mirror());
623 }
624 return mirrors;
625 }
626 };
629 int Method::line_number_from_bci(int bci) const {
630 if (bci == SynchronizationEntryBCI) bci = 0;
631 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
632 int best_bci = 0;
633 int best_line = -1;
635 if (has_linenumber_table()) {
636 // The line numbers are a short array of 2-tuples [start_pc, line_number].
637 // Not necessarily sorted and not necessarily one-to-one.
638 CompressedLineNumberReadStream stream(compressed_linenumber_table());
639 while (stream.read_pair()) {
640 if (stream.bci() == bci) {
641 // perfect match
642 return stream.line();
643 } else {
644 // update best_bci/line
645 if (stream.bci() < bci && stream.bci() >= best_bci) {
646 best_bci = stream.bci();
647 best_line = stream.line();
648 }
649 }
650 }
651 }
652 return best_line;
653 }
656 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
657 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
658 Thread *thread = Thread::current();
659 Symbol* klass_name = constants()->klass_name_at(klass_index);
660 Handle loader(thread, method_holder()->class_loader());
661 Handle prot (thread, method_holder()->protection_domain());
662 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
663 } else {
664 return true;
665 }
666 }
669 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
670 int klass_index = constants()->klass_ref_index_at(refinfo_index);
671 if (must_be_resolved) {
672 // Make sure klass is resolved in constantpool.
673 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
674 }
675 return is_klass_loaded_by_klass_index(klass_index);
676 }
679 void Method::set_native_function(address function, bool post_event_flag) {
680 assert(function != NULL, "use clear_native_function to unregister natives");
681 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
682 address* native_function = native_function_addr();
684 // We can see racers trying to place the same native function into place. Once
685 // is plenty.
686 address current = *native_function;
687 if (current == function) return;
688 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
689 function != NULL) {
690 // native_method_throw_unsatisfied_link_error_entry() should only
691 // be passed when post_event_flag is false.
692 assert(function !=
693 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
694 "post_event_flag mis-match");
696 // post the bind event, and possible change the bind function
697 JvmtiExport::post_native_method_bind(this, &function);
698 }
699 *native_function = function;
700 // This function can be called more than once. We must make sure that we always
701 // use the latest registered method -> check if a stub already has been generated.
702 // If so, we have to make it not_entrant.
703 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
704 if (nm != NULL) {
705 nm->make_not_entrant();
706 }
707 }
710 bool Method::has_native_function() const {
711 if (is_method_handle_intrinsic())
712 return false; // special-cased in SharedRuntime::generate_native_wrapper
713 address func = native_function();
714 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
715 }
718 void Method::clear_native_function() {
719 // Note: is_method_handle_intrinsic() is allowed here.
720 set_native_function(
721 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
722 !native_bind_event_is_interesting);
723 clear_code();
724 }
726 address Method::critical_native_function() {
727 methodHandle mh(this);
728 return NativeLookup::lookup_critical_entry(mh);
729 }
732 void Method::set_signature_handler(address handler) {
733 address* signature_handler = signature_handler_addr();
734 *signature_handler = handler;
735 }
738 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
739 if (PrintCompilation && report) {
740 ttyLocker ttyl;
741 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
742 if (comp_level == CompLevel_all) {
743 tty->print("all levels ");
744 } else {
745 tty->print("levels ");
746 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
747 tty->print("%d ", i);
748 }
749 }
750 this->print_short_name(tty);
751 int size = this->code_size();
752 if (size > 0) {
753 tty->print(" (%d bytes)", size);
754 }
755 if (reason != NULL) {
756 tty->print(" %s", reason);
757 }
758 tty->cr();
759 }
760 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
761 ttyLocker ttyl;
762 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
763 os::current_thread_id(), is_osr, comp_level);
764 if (reason != NULL) {
765 xtty->print(" reason=\'%s\'", reason);
766 }
767 xtty->method(this);
768 xtty->stamp();
769 xtty->end_elem();
770 }
771 }
773 bool Method::is_always_compilable() const {
774 // Generated adapters must be compiled
775 if (is_method_handle_intrinsic() && is_synthetic()) {
776 assert(!is_not_c1_compilable(), "sanity check");
777 assert(!is_not_c2_compilable(), "sanity check");
778 return true;
779 }
781 return false;
782 }
784 bool Method::is_not_compilable(int comp_level) const {
785 if (number_of_breakpoints() > 0)
786 return true;
787 if (is_always_compilable())
788 return false;
789 if (comp_level == CompLevel_any)
790 return is_not_c1_compilable() || is_not_c2_compilable();
791 if (is_c1_compile(comp_level))
792 return is_not_c1_compilable();
793 if (is_c2_compile(comp_level))
794 return is_not_c2_compilable();
795 return false;
796 }
798 // call this when compiler finds that this method is not compilable
799 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
800 if (is_always_compilable()) {
801 // Don't mark a method which should be always compilable
802 return;
803 }
804 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
805 if (comp_level == CompLevel_all) {
806 set_not_c1_compilable();
807 set_not_c2_compilable();
808 } else {
809 if (is_c1_compile(comp_level))
810 set_not_c1_compilable();
811 if (is_c2_compile(comp_level))
812 set_not_c2_compilable();
813 }
814 CompilationPolicy::policy()->disable_compilation(this);
815 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
816 }
818 bool Method::is_not_osr_compilable(int comp_level) const {
819 if (is_not_compilable(comp_level))
820 return true;
821 if (comp_level == CompLevel_any)
822 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
823 if (is_c1_compile(comp_level))
824 return is_not_c1_osr_compilable();
825 if (is_c2_compile(comp_level))
826 return is_not_c2_osr_compilable();
827 return false;
828 }
830 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
831 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
832 if (comp_level == CompLevel_all) {
833 set_not_c1_osr_compilable();
834 set_not_c2_osr_compilable();
835 } else {
836 if (is_c1_compile(comp_level))
837 set_not_c1_osr_compilable();
838 if (is_c2_compile(comp_level))
839 set_not_c2_osr_compilable();
840 }
841 CompilationPolicy::policy()->disable_compilation(this);
842 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
843 }
845 // Revert to using the interpreter and clear out the nmethod
846 void Method::clear_code() {
848 // this may be NULL if c2i adapters have not been made yet
849 // Only should happen at allocate time.
850 if (_adapter == NULL) {
851 _from_compiled_entry = NULL;
852 } else {
853 _from_compiled_entry = _adapter->get_c2i_entry();
854 }
855 OrderAccess::storestore();
856 _from_interpreted_entry = _i2i_entry;
857 OrderAccess::storestore();
858 _code = NULL;
859 }
861 // Called by class data sharing to remove any entry points (which are not shared)
862 void Method::unlink_method() {
863 _code = NULL;
864 _i2i_entry = NULL;
865 _from_interpreted_entry = NULL;
866 if (is_native()) {
867 *native_function_addr() = NULL;
868 set_signature_handler(NULL);
869 }
870 NOT_PRODUCT(set_compiled_invocation_count(0);)
871 _adapter = NULL;
872 _from_compiled_entry = NULL;
874 // In case of DumpSharedSpaces, _method_data should always be NULL.
875 //
876 // During runtime (!DumpSharedSpaces), when we are cleaning a
877 // shared class that failed to load, this->link_method() may
878 // have already been called (before an exception happened), so
879 // this->_method_data may not be NULL.
880 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?");
882 set_method_data(NULL);
883 clear_method_counters();
884 }
886 // Called when the method_holder is getting linked. Setup entrypoints so the method
887 // is ready to be called from interpreter, compiler, and vtables.
888 void Method::link_method(methodHandle h_method, TRAPS) {
889 // If the code cache is full, we may reenter this function for the
890 // leftover methods that weren't linked.
891 if (_i2i_entry != NULL) return;
893 assert(_adapter == NULL, "init'd to NULL" );
894 assert( _code == NULL, "nothing compiled yet" );
896 // Setup interpreter entrypoint
897 assert(this == h_method(), "wrong h_method()" );
898 address entry = Interpreter::entry_for_method(h_method);
899 assert(entry != NULL, "interpreter entry must be non-null");
900 // Sets both _i2i_entry and _from_interpreted_entry
901 set_interpreter_entry(entry);
903 // Don't overwrite already registered native entries.
904 if (is_native() && !has_native_function()) {
905 set_native_function(
906 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
907 !native_bind_event_is_interesting);
908 }
910 // Setup compiler entrypoint. This is made eagerly, so we do not need
911 // special handling of vtables. An alternative is to make adapters more
912 // lazily by calling make_adapter() from from_compiled_entry() for the
913 // normal calls. For vtable calls life gets more complicated. When a
914 // call-site goes mega-morphic we need adapters in all methods which can be
915 // called from the vtable. We need adapters on such methods that get loaded
916 // later. Ditto for mega-morphic itable calls. If this proves to be a
917 // problem we'll make these lazily later.
918 (void) make_adapters(h_method, CHECK);
920 // ONLY USE the h_method now as make_adapter may have blocked
922 }
924 address Method::make_adapters(methodHandle mh, TRAPS) {
925 // Adapters for compiled code are made eagerly here. They are fairly
926 // small (generally < 100 bytes) and quick to make (and cached and shared)
927 // so making them eagerly shouldn't be too expensive.
928 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
929 if (adapter == NULL ) {
930 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
931 }
933 mh->set_adapter_entry(adapter);
934 mh->_from_compiled_entry = adapter->get_c2i_entry();
935 return adapter->get_c2i_entry();
936 }
938 void Method::restore_unshareable_info(TRAPS) {
939 // Since restore_unshareable_info can be called more than once for a method, don't
940 // redo any work. If this field is restored, there is nothing to do.
941 if (_from_compiled_entry == NULL) {
942 // restore method's vtable by calling a virtual function
943 restore_vtable();
945 methodHandle mh(THREAD, this);
946 link_method(mh, CHECK);
947 }
948 }
951 // The verified_code_entry() must be called when a invoke is resolved
952 // on this method.
954 // It returns the compiled code entry point, after asserting not null.
955 // This function is called after potential safepoints so that nmethod
956 // or adapter that it points to is still live and valid.
957 // This function must not hit a safepoint!
958 address Method::verified_code_entry() {
959 debug_only(No_Safepoint_Verifier nsv;)
960 assert(_from_compiled_entry != NULL, "must be set");
961 return _from_compiled_entry;
962 }
964 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
965 // (could be racing a deopt).
966 // Not inline to avoid circular ref.
967 bool Method::check_code() const {
968 // cached in a register or local. There's a race on the value of the field.
969 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
970 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
971 }
973 // Install compiled code. Instantly it can execute.
974 void Method::set_code(methodHandle mh, nmethod *code) {
975 assert( code, "use clear_code to remove code" );
976 assert( mh->check_code(), "" );
978 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
980 // These writes must happen in this order, because the interpreter will
981 // directly jump to from_interpreted_entry which jumps to an i2c adapter
982 // which jumps to _from_compiled_entry.
983 mh->_code = code; // Assign before allowing compiled code to exec
985 int comp_level = code->comp_level();
986 // In theory there could be a race here. In practice it is unlikely
987 // and not worth worrying about.
988 if (comp_level > mh->highest_comp_level()) {
989 mh->set_highest_comp_level(comp_level);
990 }
992 OrderAccess::storestore();
993 #ifdef SHARK
994 mh->_from_interpreted_entry = code->insts_begin();
995 #else //!SHARK
996 mh->_from_compiled_entry = code->verified_entry_point();
997 OrderAccess::storestore();
998 // Instantly compiled code can execute.
999 if (!mh->is_method_handle_intrinsic())
1000 mh->_from_interpreted_entry = mh->get_i2c_entry();
1001 #endif //!SHARK
1002 }
1005 bool Method::is_overridden_in(Klass* k) const {
1006 InstanceKlass* ik = InstanceKlass::cast(k);
1008 if (ik->is_interface()) return false;
1010 // If method is an interface, we skip it - except if it
1011 // is a miranda method
1012 if (method_holder()->is_interface()) {
1013 // Check that method is not a miranda method
1014 if (ik->lookup_method(name(), signature()) == NULL) {
1015 // No implementation exist - so miranda method
1016 return false;
1017 }
1018 return true;
1019 }
1021 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1022 assert(ik->vtable() != NULL, "vtable should exist");
1023 if (!has_vtable_index()) {
1024 return false;
1025 } else {
1026 Method* vt_m = ik->method_at_vtable(vtable_index());
1027 return vt_m != this;
1028 }
1029 }
1032 // give advice about whether this Method* should be cached or not
1033 bool Method::should_not_be_cached() const {
1034 if (is_old()) {
1035 // This method has been redefined. It is either EMCP or obsolete
1036 // and we don't want to cache it because that would pin the method
1037 // down and prevent it from being collectible if and when it
1038 // finishes executing.
1039 return true;
1040 }
1042 // caching this method should be just fine
1043 return false;
1044 }
1047 /**
1048 * Returns true if this is one of the specially treated methods for
1049 * security related stack walks (like Reflection.getCallerClass).
1050 */
1051 bool Method::is_ignored_by_security_stack_walk() const {
1052 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection;
1054 if (intrinsic_id() == vmIntrinsics::_invoke) {
1055 // This is Method.invoke() -- ignore it
1056 return true;
1057 }
1058 if (use_new_reflection &&
1059 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1060 // This is an auxilary frame -- ignore it
1061 return true;
1062 }
1063 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1064 // This is an internal adapter frame for method handles -- ignore it
1065 return true;
1066 }
1067 return false;
1068 }
1071 // Constant pool structure for invoke methods:
1072 enum {
1073 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1074 _imcp_invoke_signature, // utf8: (variable Symbol*)
1075 _imcp_limit
1076 };
1078 // Test if this method is an MH adapter frame generated by Java code.
1079 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1080 bool Method::is_compiled_lambda_form() const {
1081 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1082 }
1084 // Test if this method is an internal MH primitive method.
1085 bool Method::is_method_handle_intrinsic() const {
1086 vmIntrinsics::ID iid = intrinsic_id();
1087 return (MethodHandles::is_signature_polymorphic(iid) &&
1088 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1089 }
1091 bool Method::has_member_arg() const {
1092 vmIntrinsics::ID iid = intrinsic_id();
1093 return (MethodHandles::is_signature_polymorphic(iid) &&
1094 MethodHandles::has_member_arg(iid));
1095 }
1097 // Make an instance of a signature-polymorphic internal MH primitive.
1098 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1099 Symbol* signature,
1100 TRAPS) {
1101 ResourceMark rm;
1102 methodHandle empty;
1104 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1105 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1106 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1107 if (TraceMethodHandles) {
1108 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1109 }
1111 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1112 name->increment_refcount();
1113 signature->increment_refcount();
1115 int cp_length = _imcp_limit;
1116 ClassLoaderData* loader_data = holder->class_loader_data();
1117 constantPoolHandle cp;
1118 {
1119 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1120 cp = constantPoolHandle(THREAD, cp_oop);
1121 }
1122 cp->set_pool_holder(InstanceKlass::cast(holder()));
1123 cp->symbol_at_put(_imcp_invoke_name, name);
1124 cp->symbol_at_put(_imcp_invoke_signature, signature);
1125 cp->set_has_preresolution();
1127 // decide on access bits: public or not?
1128 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1129 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1130 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1131 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1133 methodHandle m;
1134 {
1135 InlineTableSizes sizes;
1136 Method* m_oop = Method::allocate(loader_data, 0,
1137 accessFlags_from(flags_bits), &sizes,
1138 ConstMethod::NORMAL, CHECK_(empty));
1139 m = methodHandle(THREAD, m_oop);
1140 }
1141 m->set_constants(cp());
1142 m->set_name_index(_imcp_invoke_name);
1143 m->set_signature_index(_imcp_invoke_signature);
1144 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1145 assert(m->signature() == signature, "");
1146 ResultTypeFinder rtf(signature);
1147 m->constMethod()->set_result_type(rtf.type());
1148 m->compute_size_of_parameters(THREAD);
1149 m->init_intrinsic_id();
1150 assert(m->is_method_handle_intrinsic(), "");
1151 #ifdef ASSERT
1152 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1153 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1154 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1155 #endif //ASSERT
1157 // Finally, set up its entry points.
1158 assert(m->can_be_statically_bound(), "");
1159 m->set_vtable_index(Method::nonvirtual_vtable_index);
1160 m->link_method(m, CHECK_(empty));
1162 if (TraceMethodHandles && (Verbose || WizardMode))
1163 m->print_on(tty);
1165 return m;
1166 }
1168 Klass* Method::check_non_bcp_klass(Klass* klass) {
1169 if (klass != NULL && klass->class_loader() != NULL) {
1170 if (klass->oop_is_objArray())
1171 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1172 return klass;
1173 }
1174 return NULL;
1175 }
1178 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1179 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1180 // Code below does not work for native methods - they should never get rewritten anyway
1181 assert(!m->is_native(), "cannot rewrite native methods");
1182 // Allocate new Method*
1183 AccessFlags flags = m->access_flags();
1185 ConstMethod* cm = m->constMethod();
1186 int checked_exceptions_len = cm->checked_exceptions_length();
1187 int localvariable_len = cm->localvariable_table_length();
1188 int exception_table_len = cm->exception_table_length();
1189 int method_parameters_len = cm->method_parameters_length();
1190 int method_annotations_len = cm->method_annotations_length();
1191 int parameter_annotations_len = cm->parameter_annotations_length();
1192 int type_annotations_len = cm->type_annotations_length();
1193 int default_annotations_len = cm->default_annotations_length();
1195 InlineTableSizes sizes(
1196 localvariable_len,
1197 new_compressed_linenumber_size,
1198 exception_table_len,
1199 checked_exceptions_len,
1200 method_parameters_len,
1201 cm->generic_signature_index(),
1202 method_annotations_len,
1203 parameter_annotations_len,
1204 type_annotations_len,
1205 default_annotations_len,
1206 0);
1208 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1209 Method* newm_oop = Method::allocate(loader_data,
1210 new_code_length,
1211 flags,
1212 &sizes,
1213 m->method_type(),
1214 CHECK_(methodHandle()));
1215 methodHandle newm (THREAD, newm_oop);
1216 int new_method_size = newm->method_size();
1218 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1219 ConstMethod* newcm = newm->constMethod();
1220 int new_const_method_size = newm->constMethod()->size();
1222 memcpy(newm(), m(), sizeof(Method));
1224 // Create shallow copy of ConstMethod.
1225 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1227 // Reset correct method/const method, method size, and parameter info
1228 newm->set_constMethod(newcm);
1229 newm->constMethod()->set_code_size(new_code_length);
1230 newm->constMethod()->set_constMethod_size(new_const_method_size);
1231 newm->set_method_size(new_method_size);
1232 assert(newm->code_size() == new_code_length, "check");
1233 assert(newm->method_parameters_length() == method_parameters_len, "check");
1234 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1235 assert(newm->exception_table_length() == exception_table_len, "check");
1236 assert(newm->localvariable_table_length() == localvariable_len, "check");
1237 // Copy new byte codes
1238 memcpy(newm->code_base(), new_code, new_code_length);
1239 // Copy line number table
1240 if (new_compressed_linenumber_size > 0) {
1241 memcpy(newm->compressed_linenumber_table(),
1242 new_compressed_linenumber_table,
1243 new_compressed_linenumber_size);
1244 }
1245 // Copy method_parameters
1246 if (method_parameters_len > 0) {
1247 memcpy(newm->method_parameters_start(),
1248 m->method_parameters_start(),
1249 method_parameters_len * sizeof(MethodParametersElement));
1250 }
1251 // Copy checked_exceptions
1252 if (checked_exceptions_len > 0) {
1253 memcpy(newm->checked_exceptions_start(),
1254 m->checked_exceptions_start(),
1255 checked_exceptions_len * sizeof(CheckedExceptionElement));
1256 }
1257 // Copy exception table
1258 if (exception_table_len > 0) {
1259 memcpy(newm->exception_table_start(),
1260 m->exception_table_start(),
1261 exception_table_len * sizeof(ExceptionTableElement));
1262 }
1263 // Copy local variable number table
1264 if (localvariable_len > 0) {
1265 memcpy(newm->localvariable_table_start(),
1266 m->localvariable_table_start(),
1267 localvariable_len * sizeof(LocalVariableTableElement));
1268 }
1269 // Copy stackmap table
1270 if (m->has_stackmap_table()) {
1271 int code_attribute_length = m->stackmap_data()->length();
1272 Array<u1>* stackmap_data =
1273 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1274 memcpy((void*)stackmap_data->adr_at(0),
1275 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1276 newm->set_stackmap_data(stackmap_data);
1277 }
1279 // copy annotations over to new method
1280 newcm->copy_annotations_from(cm);
1281 return newm;
1282 }
1284 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1285 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1286 // because we are not loading from core libraries
1287 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1288 // which does not use the class default class loader so we check for its loader here
1289 InstanceKlass* ik = InstanceKlass::cast(holder);
1290 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) {
1291 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1292 }
1294 // see if the klass name is well-known:
1295 Symbol* klass_name = ik->name();
1296 return vmSymbols::find_sid(klass_name);
1297 }
1299 void Method::init_intrinsic_id() {
1300 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1301 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1302 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1303 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1305 // the klass name is well-known:
1306 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1307 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1309 // ditto for method and signature:
1310 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1311 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1312 && name_id == vmSymbols::NO_SID)
1313 return;
1314 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1315 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1316 && sig_id == vmSymbols::NO_SID) return;
1317 jshort flags = access_flags().as_short();
1319 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1320 if (id != vmIntrinsics::_none) {
1321 set_intrinsic_id(id);
1322 return;
1323 }
1325 // A few slightly irregular cases:
1326 switch (klass_id) {
1327 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1328 // Second chance: check in regular Math.
1329 switch (name_id) {
1330 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1331 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1332 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1333 // pretend it is the corresponding method in the non-strict class:
1334 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1335 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1336 break;
1337 }
1338 break;
1340 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1341 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1342 if (!is_native()) break;
1343 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1344 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1345 id = vmIntrinsics::_none;
1346 break;
1347 }
1349 if (id != vmIntrinsics::_none) {
1350 // Set up its iid. It is an alias method.
1351 set_intrinsic_id(id);
1352 return;
1353 }
1354 }
1356 // These two methods are static since a GC may move the Method
1357 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1358 if (THREAD->is_Compiler_thread()) {
1359 // There is nothing useful this routine can do from within the Compile thread.
1360 // Hopefully, the signature contains only well-known classes.
1361 // We could scan for this and return true/false, but the caller won't care.
1362 return false;
1363 }
1364 bool sig_is_loaded = true;
1365 Handle class_loader(THREAD, m->method_holder()->class_loader());
1366 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1367 ResourceMark rm(THREAD);
1368 Symbol* signature = m->signature();
1369 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1370 if (ss.is_object()) {
1371 Symbol* sym = ss.as_symbol(CHECK_(false));
1372 Symbol* name = sym;
1373 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1374 protection_domain, THREAD);
1375 // We are loading classes eagerly. If a ClassNotFoundException or
1376 // a LinkageError was generated, be sure to ignore it.
1377 if (HAS_PENDING_EXCEPTION) {
1378 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1379 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1380 CLEAR_PENDING_EXCEPTION;
1381 } else {
1382 return false;
1383 }
1384 }
1385 if( klass == NULL) { sig_is_loaded = false; }
1386 }
1387 }
1388 return sig_is_loaded;
1389 }
1391 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1392 Handle class_loader(THREAD, m->method_holder()->class_loader());
1393 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1394 ResourceMark rm(THREAD);
1395 Symbol* signature = m->signature();
1396 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1397 if (ss.type() == T_OBJECT) {
1398 Symbol* name = ss.as_symbol_or_null();
1399 if (name == NULL) return true;
1400 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1401 if (klass == NULL) return true;
1402 }
1403 }
1404 return false;
1405 }
1407 // Exposed so field engineers can debug VM
1408 void Method::print_short_name(outputStream* st) {
1409 ResourceMark rm;
1410 #ifdef PRODUCT
1411 st->print(" %s::", method_holder()->external_name());
1412 #else
1413 st->print(" %s::", method_holder()->internal_name());
1414 #endif
1415 name()->print_symbol_on(st);
1416 if (WizardMode) signature()->print_symbol_on(st);
1417 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1418 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1419 }
1421 // Comparer for sorting an object array containing
1422 // Method*s.
1423 static int method_comparator(Method* a, Method* b) {
1424 return a->name()->fast_compare(b->name());
1425 }
1427 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1428 // default_methods also uses this without the ordering for fast find_method
1429 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1430 int length = methods->length();
1431 if (length > 1) {
1432 {
1433 No_Safepoint_Verifier nsv;
1434 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1435 }
1436 // Reset method ordering
1437 if (set_idnums) {
1438 for (int i = 0; i < length; i++) {
1439 Method* m = methods->at(i);
1440 m->set_method_idnum(i);
1441 m->set_orig_method_idnum(i);
1442 }
1443 }
1444 }
1445 }
1447 //-----------------------------------------------------------------------------------
1448 // Non-product code unless JVM/TI needs it
1450 #if !defined(PRODUCT) || INCLUDE_JVMTI
1451 class SignatureTypePrinter : public SignatureTypeNames {
1452 private:
1453 outputStream* _st;
1454 bool _use_separator;
1456 void type_name(const char* name) {
1457 if (_use_separator) _st->print(", ");
1458 _st->print("%s", name);
1459 _use_separator = true;
1460 }
1462 public:
1463 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1464 _st = st;
1465 _use_separator = false;
1466 }
1468 void print_parameters() { _use_separator = false; iterate_parameters(); }
1469 void print_returntype() { _use_separator = false; iterate_returntype(); }
1470 };
1473 void Method::print_name(outputStream* st) {
1474 Thread *thread = Thread::current();
1475 ResourceMark rm(thread);
1476 SignatureTypePrinter sig(signature(), st);
1477 st->print("%s ", is_static() ? "static" : "virtual");
1478 sig.print_returntype();
1479 st->print(" %s.", method_holder()->internal_name());
1480 name()->print_symbol_on(st);
1481 st->print("(");
1482 sig.print_parameters();
1483 st->print(")");
1484 }
1485 #endif // !PRODUCT || INCLUDE_JVMTI
1488 //-----------------------------------------------------------------------------------
1489 // Non-product code
1491 #ifndef PRODUCT
1492 void Method::print_codes_on(outputStream* st) const {
1493 print_codes_on(0, code_size(), st);
1494 }
1496 void Method::print_codes_on(int from, int to, outputStream* st) const {
1497 Thread *thread = Thread::current();
1498 ResourceMark rm(thread);
1499 methodHandle mh (thread, (Method*)this);
1500 BytecodeStream s(mh);
1501 s.set_interval(from, to);
1502 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1503 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1504 }
1505 #endif // not PRODUCT
1508 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1509 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1510 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1511 // as end-of-stream terminator.
1513 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1514 // bci and line number does not compress into single byte.
1515 // Write out escape character and use regular compression for bci and line number.
1516 write_byte((jubyte)0xFF);
1517 write_signed_int(bci_delta);
1518 write_signed_int(line_delta);
1519 }
1521 // See comment in method.hpp which explains why this exists.
1522 #if defined(_M_AMD64) && _MSC_VER >= 1400
1523 #pragma optimize("", off)
1524 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1525 write_pair_inline(bci, line);
1526 }
1527 #pragma optimize("", on)
1528 #endif
1530 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1531 _bci = 0;
1532 _line = 0;
1533 };
1536 bool CompressedLineNumberReadStream::read_pair() {
1537 jubyte next = read_byte();
1538 // Check for terminator
1539 if (next == 0) return false;
1540 if (next == 0xFF) {
1541 // Escape character, regular compression used
1542 _bci += read_signed_int();
1543 _line += read_signed_int();
1544 } else {
1545 // Single byte compression used
1546 _bci += next >> 3;
1547 _line += next & 0x7;
1548 }
1549 return true;
1550 }
1553 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1554 BreakpointInfo* bp = method_holder()->breakpoints();
1555 for (; bp != NULL; bp = bp->next()) {
1556 if (bp->match(this, bci)) {
1557 return bp->orig_bytecode();
1558 }
1559 }
1560 {
1561 ResourceMark rm;
1562 fatal(err_msg("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci));
1563 }
1564 return Bytecodes::_shouldnotreachhere;
1565 }
1567 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1568 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1569 BreakpointInfo* bp = method_holder()->breakpoints();
1570 for (; bp != NULL; bp = bp->next()) {
1571 if (bp->match(this, bci)) {
1572 bp->set_orig_bytecode(code);
1573 // and continue, in case there is more than one
1574 }
1575 }
1576 }
1578 void Method::set_breakpoint(int bci) {
1579 InstanceKlass* ik = method_holder();
1580 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1581 bp->set_next(ik->breakpoints());
1582 ik->set_breakpoints(bp);
1583 // do this last:
1584 bp->set(this);
1585 }
1587 static void clear_matches(Method* m, int bci) {
1588 InstanceKlass* ik = m->method_holder();
1589 BreakpointInfo* prev_bp = NULL;
1590 BreakpointInfo* next_bp;
1591 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1592 next_bp = bp->next();
1593 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1594 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1595 // do this first:
1596 bp->clear(m);
1597 // unhook it
1598 if (prev_bp != NULL)
1599 prev_bp->set_next(next_bp);
1600 else
1601 ik->set_breakpoints(next_bp);
1602 delete bp;
1603 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1604 // at same location. So we have multiple matching (method_index and bci)
1605 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1606 // breakpoint for clear_breakpoint request and keep all other method versions
1607 // BreakpointInfo for future clear_breakpoint request.
1608 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1609 // which is being called when class is unloaded. We delete all the Breakpoint
1610 // information for all versions of method. We may not correctly restore the original
1611 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1612 // so these methods won't be used anymore.
1613 if (bci >= 0) {
1614 break;
1615 }
1616 } else {
1617 // This one is a keeper.
1618 prev_bp = bp;
1619 }
1620 }
1621 }
1623 void Method::clear_breakpoint(int bci) {
1624 assert(bci >= 0, "");
1625 clear_matches(this, bci);
1626 }
1628 void Method::clear_all_breakpoints() {
1629 clear_matches(this, -1);
1630 }
1633 int Method::invocation_count() {
1634 MethodCounters *mcs = method_counters();
1635 if (TieredCompilation) {
1636 MethodData* const mdo = method_data();
1637 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1638 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1639 return InvocationCounter::count_limit;
1640 } else {
1641 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1642 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1643 }
1644 } else {
1645 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1646 }
1647 }
1649 int Method::backedge_count() {
1650 MethodCounters *mcs = method_counters();
1651 if (TieredCompilation) {
1652 MethodData* const mdo = method_data();
1653 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1654 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1655 return InvocationCounter::count_limit;
1656 } else {
1657 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1658 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1659 }
1660 } else {
1661 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1662 }
1663 }
1665 int Method::highest_comp_level() const {
1666 const MethodCounters* mcs = method_counters();
1667 if (mcs != NULL) {
1668 return mcs->highest_comp_level();
1669 } else {
1670 return CompLevel_none;
1671 }
1672 }
1674 int Method::highest_osr_comp_level() const {
1675 const MethodCounters* mcs = method_counters();
1676 if (mcs != NULL) {
1677 return mcs->highest_osr_comp_level();
1678 } else {
1679 return CompLevel_none;
1680 }
1681 }
1683 void Method::set_highest_comp_level(int level) {
1684 MethodCounters* mcs = method_counters();
1685 if (mcs != NULL) {
1686 mcs->set_highest_comp_level(level);
1687 }
1688 }
1690 void Method::set_highest_osr_comp_level(int level) {
1691 MethodCounters* mcs = method_counters();
1692 if (mcs != NULL) {
1693 mcs->set_highest_osr_comp_level(level);
1694 }
1695 }
1697 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1698 _bci = bci;
1699 _name_index = m->name_index();
1700 _signature_index = m->signature_index();
1701 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1702 if (_orig_bytecode == Bytecodes::_breakpoint)
1703 _orig_bytecode = m->orig_bytecode_at(_bci);
1704 _next = NULL;
1705 }
1707 void BreakpointInfo::set(Method* method) {
1708 #ifdef ASSERT
1709 {
1710 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1711 if (code == Bytecodes::_breakpoint)
1712 code = method->orig_bytecode_at(_bci);
1713 assert(orig_bytecode() == code, "original bytecode must be the same");
1714 }
1715 #endif
1716 Thread *thread = Thread::current();
1717 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1718 method->incr_number_of_breakpoints(thread);
1719 SystemDictionary::notice_modification();
1720 {
1721 // Deoptimize all dependents on this method
1722 HandleMark hm(thread);
1723 methodHandle mh(thread, method);
1724 Universe::flush_dependents_on_method(mh);
1725 }
1726 }
1728 void BreakpointInfo::clear(Method* method) {
1729 *method->bcp_from(_bci) = orig_bytecode();
1730 assert(method->number_of_breakpoints() > 0, "must not go negative");
1731 method->decr_number_of_breakpoints(Thread::current());
1732 }
1734 // jmethodID handling
1736 // This is a block allocating object, sort of like JNIHandleBlock, only a
1737 // lot simpler. There aren't many of these, they aren't long, they are rarely
1738 // deleted and so we can do some suboptimal things.
1739 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1740 // never get rid of it.
1741 // It would be nice to be able to parameterize the number of methods for
1742 // the null_class_loader but then we'd have to turn this and ClassLoaderData
1743 // into templates.
1745 // I feel like this brain dead class should exist somewhere in the STL
1747 class JNIMethodBlock : public CHeapObj<mtClass> {
1748 enum { number_of_methods = 8 };
1750 Method* _methods[number_of_methods];
1751 int _top;
1752 JNIMethodBlock* _next;
1753 public:
1754 static Method* const _free_method;
1756 JNIMethodBlock() : _next(NULL), _top(0) {
1757 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method;
1758 }
1760 Method** add_method(Method* m) {
1761 if (_top < number_of_methods) {
1762 // top points to the next free entry.
1763 int i = _top;
1764 _methods[i] = m;
1765 _top++;
1766 return &_methods[i];
1767 } else if (_top == number_of_methods) {
1768 // if the next free entry ran off the block see if there's a free entry
1769 for (int i = 0; i< number_of_methods; i++) {
1770 if (_methods[i] == _free_method) {
1771 _methods[i] = m;
1772 return &_methods[i];
1773 }
1774 }
1775 // Only check each block once for frees. They're very unlikely.
1776 // Increment top past the end of the block.
1777 _top++;
1778 }
1779 // need to allocate a next block.
1780 if (_next == NULL) {
1781 _next = new JNIMethodBlock();
1782 }
1783 return _next->add_method(m);
1784 }
1786 bool contains(Method** m) {
1787 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1788 for (int i = 0; i< number_of_methods; i++) {
1789 if (&(b->_methods[i]) == m) {
1790 return true;
1791 }
1792 }
1793 }
1794 return false; // not found
1795 }
1797 // Doesn't really destroy it, just marks it as free so it can be reused.
1798 void destroy_method(Method** m) {
1799 #ifdef ASSERT
1800 assert(contains(m), "should be a methodID");
1801 #endif // ASSERT
1802 *m = _free_method;
1803 }
1804 void clear_method(Method* m) {
1805 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1806 for (int i = 0; i < number_of_methods; i++) {
1807 if (b->_methods[i] == m) {
1808 b->_methods[i] = NULL;
1809 return;
1810 }
1811 }
1812 }
1813 // not found
1814 }
1816 // During class unloading the methods are cleared, which is different
1817 // than freed.
1818 void clear_all_methods() {
1819 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1820 for (int i = 0; i< number_of_methods; i++) {
1821 b->_methods[i] = NULL;
1822 }
1823 }
1824 }
1825 #ifndef PRODUCT
1826 int count_methods() {
1827 // count all allocated methods
1828 int count = 0;
1829 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1830 for (int i = 0; i< number_of_methods; i++) {
1831 if (b->_methods[i] != _free_method) count++;
1832 }
1833 }
1834 return count;
1835 }
1836 #endif // PRODUCT
1837 };
1839 // Something that can't be mistaken for an address or a markOop
1840 Method* const JNIMethodBlock::_free_method = (Method*)55;
1842 // Add a method id to the jmethod_ids
1843 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
1844 ClassLoaderData* cld = loader_data;
1846 if (!SafepointSynchronize::is_at_safepoint()) {
1847 // Have to add jmethod_ids() to class loader data thread-safely.
1848 // Also have to add the method to the list safely, which the cld lock
1849 // protects as well.
1850 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1851 if (cld->jmethod_ids() == NULL) {
1852 cld->set_jmethod_ids(new JNIMethodBlock());
1853 }
1854 // jmethodID is a pointer to Method*
1855 return (jmethodID)cld->jmethod_ids()->add_method(m);
1856 } else {
1857 // At safepoint, we are single threaded and can set this.
1858 if (cld->jmethod_ids() == NULL) {
1859 cld->set_jmethod_ids(new JNIMethodBlock());
1860 }
1861 // jmethodID is a pointer to Method*
1862 return (jmethodID)cld->jmethod_ids()->add_method(m);
1863 }
1864 }
1866 // Mark a jmethodID as free. This is called when there is a data race in
1867 // InstanceKlass while creating the jmethodID cache.
1868 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
1869 ClassLoaderData* cld = loader_data;
1870 Method** ptr = (Method**)m;
1871 assert(cld->jmethod_ids() != NULL, "should have method handles");
1872 cld->jmethod_ids()->destroy_method(ptr);
1873 }
1875 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
1876 // Can't assert the method_holder is the same because the new method has the
1877 // scratch method holder.
1878 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
1879 == new_method->method_holder()->class_loader(),
1880 "changing to a different class loader");
1881 // Just change the method in place, jmethodID pointer doesn't change.
1882 *((Method**)jmid) = new_method;
1883 }
1885 bool Method::is_method_id(jmethodID mid) {
1886 Method* m = resolve_jmethod_id(mid);
1887 if (m == NULL) {
1888 return false;
1889 }
1890 InstanceKlass* ik = m->method_holder();
1891 if (ik == NULL) {
1892 return false;
1893 }
1894 ClassLoaderData* cld = ik->class_loader_data();
1895 if (cld->jmethod_ids() == NULL) return false;
1896 return (cld->jmethod_ids()->contains((Method**)mid));
1897 }
1899 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
1900 if (mid == NULL) return NULL;
1901 if (!Method::is_method_id(mid)) {
1902 return NULL;
1903 }
1904 Method* o = resolve_jmethod_id(mid);
1905 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
1906 return NULL;
1907 }
1908 return o;
1909 };
1911 void Method::set_on_stack(const bool value) {
1912 // Set both the method itself and its constant pool. The constant pool
1913 // on stack means some method referring to it is also on the stack.
1914 constants()->set_on_stack(value);
1916 bool succeeded = _access_flags.set_on_stack(value);
1917 if (value && succeeded) {
1918 MetadataOnStackMark::record(this, Thread::current());
1919 }
1920 }
1922 void Method::clear_jmethod_id(ClassLoaderData* loader_data) {
1923 loader_data->jmethod_ids()->clear_method(this);
1924 }
1926 // Called when the class loader is unloaded to make all methods weak.
1927 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1928 loader_data->jmethod_ids()->clear_all_methods();
1929 }
1931 bool Method::has_method_vptr(const void* ptr) {
1932 Method m;
1933 // This assumes that the vtbl pointer is the first word of a C++ object.
1934 // This assumption is also in universe.cpp patch_klass_vtble
1935 void* vtbl2 = dereference_vptr((const void*)&m);
1936 void* this_vtbl = dereference_vptr(ptr);
1937 return vtbl2 == this_vtbl;
1938 }
1940 // Check that this pointer is valid by checking that the vtbl pointer matches
1941 bool Method::is_valid_method() const {
1942 if (this == NULL) {
1943 return false;
1944 } else if (!is_metaspace_object()) {
1945 return false;
1946 } else {
1947 return has_method_vptr((const void*)this);
1948 }
1949 }
1951 #ifndef PRODUCT
1952 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1953 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1954 }
1955 #endif // PRODUCT
1958 // Printing
1960 #ifndef PRODUCT
1962 void Method::print_on(outputStream* st) const {
1963 ResourceMark rm;
1964 assert(is_method(), "must be method");
1965 st->print_cr("%s", internal_name());
1966 // get the effect of PrintOopAddress, always, for methods:
1967 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this);
1968 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
1969 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants());
1970 constants()->print_value_on(st); st->cr();
1971 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
1972 st->print (" - name: "); name()->print_value_on(st); st->cr();
1973 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
1974 st->print_cr(" - max stack: %d", max_stack());
1975 st->print_cr(" - max locals: %d", max_locals());
1976 st->print_cr(" - size of params: %d", size_of_parameters());
1977 st->print_cr(" - method size: %d", method_size());
1978 if (intrinsic_id() != vmIntrinsics::_none)
1979 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
1980 if (highest_comp_level() != CompLevel_none)
1981 st->print_cr(" - highest level: %d", highest_comp_level());
1982 st->print_cr(" - vtable index: %d", _vtable_index);
1983 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
1984 st->print( " - adapters: ");
1985 AdapterHandlerEntry* a = ((Method*)this)->adapter();
1986 if (a == NULL)
1987 st->print_cr(INTPTR_FORMAT, a);
1988 else
1989 a->print_adapter_on(st);
1990 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
1991 st->print_cr(" - code size: %d", code_size());
1992 if (code_size() != 0) {
1993 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
1994 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
1995 }
1996 if (method_data() != NULL) {
1997 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
1998 }
1999 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2000 if (checked_exceptions_length() > 0) {
2001 CheckedExceptionElement* table = checked_exceptions_start();
2002 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
2003 if (Verbose) {
2004 for (int i = 0; i < checked_exceptions_length(); i++) {
2005 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2006 }
2007 }
2008 }
2009 if (has_linenumber_table()) {
2010 u_char* table = compressed_linenumber_table();
2011 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
2012 if (Verbose) {
2013 CompressedLineNumberReadStream stream(table);
2014 while (stream.read_pair()) {
2015 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2016 }
2017 }
2018 }
2019 st->print_cr(" - localvar length: %d", localvariable_table_length());
2020 if (localvariable_table_length() > 0) {
2021 LocalVariableTableElement* table = localvariable_table_start();
2022 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
2023 if (Verbose) {
2024 for (int i = 0; i < localvariable_table_length(); i++) {
2025 int bci = table[i].start_bci;
2026 int len = table[i].length;
2027 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2028 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2029 int slot = table[i].slot;
2030 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2031 }
2032 }
2033 }
2034 if (code() != NULL) {
2035 st->print (" - compiled code: ");
2036 code()->print_value_on(st);
2037 }
2038 if (is_native()) {
2039 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
2040 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
2041 }
2042 }
2044 #endif //PRODUCT
2046 void Method::print_value_on(outputStream* st) const {
2047 assert(is_method(), "must be method");
2048 st->print("%s", internal_name());
2049 print_address_on(st);
2050 st->print(" ");
2051 name()->print_value_on(st);
2052 st->print(" ");
2053 signature()->print_value_on(st);
2054 st->print(" in ");
2055 method_holder()->print_value_on(st);
2056 if (WizardMode) st->print("#%d", _vtable_index);
2057 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2058 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2059 }
2061 #if INCLUDE_SERVICES
2062 // Size Statistics
2063 void Method::collect_statistics(KlassSizeStats *sz) const {
2064 int mysize = sz->count(this);
2065 sz->_method_bytes += mysize;
2066 sz->_method_all_bytes += mysize;
2067 sz->_rw_bytes += mysize;
2069 if (constMethod()) {
2070 constMethod()->collect_statistics(sz);
2071 }
2072 if (method_data()) {
2073 method_data()->collect_statistics(sz);
2074 }
2075 }
2076 #endif // INCLUDE_SERVICES
2078 // Verification
2080 void Method::verify_on(outputStream* st) {
2081 guarantee(is_method(), "object must be method");
2082 guarantee(constants()->is_constantPool(), "should be constant pool");
2083 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2084 MethodData* md = method_data();
2085 guarantee(md == NULL ||
2086 md->is_methodData(), "should be method data");
2087 }