Mon, 17 Sep 2012 17:02:10 -0700
7197033: missing ResourceMark for assert in Method::bci_from()
Summary: Added missing ResourceMark.
Reviewed-by: dholmes, coleenp, jmasa
1 /*
2 * Copyright (c) 1997, 2012, 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/systemDictionary.hpp"
27 #include "code/debugInfoRec.hpp"
28 #include "gc_interface/collectedHeap.inline.hpp"
29 #include "interpreter/bytecodeStream.hpp"
30 #include "interpreter/bytecodeTracer.hpp"
31 #include "interpreter/bytecodes.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "interpreter/oopMapCache.hpp"
34 #include "memory/gcLocker.hpp"
35 #include "memory/generation.hpp"
36 #include "memory/metadataFactory.hpp"
37 #include "memory/oopFactory.hpp"
38 #include "oops/methodData.hpp"
39 #include "oops/method.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "oops/symbol.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "prims/jvmtiRedefineClasses.hpp"
44 #include "prims/methodHandles.hpp"
45 #include "prims/nativeLookup.hpp"
46 #include "runtime/arguments.hpp"
47 #include "runtime/compilationPolicy.hpp"
48 #include "runtime/frame.inline.hpp"
49 #include "runtime/handles.inline.hpp"
50 #include "runtime/relocator.hpp"
51 #include "runtime/sharedRuntime.hpp"
52 #include "runtime/signature.hpp"
53 #include "utilities/quickSort.hpp"
54 #include "utilities/xmlstream.hpp"
57 // Implementation of Method
59 Method* Method::allocate(ClassLoaderData* loader_data,
60 int byte_code_size,
61 AccessFlags access_flags,
62 int compressed_line_number_size,
63 int localvariable_table_length,
64 int exception_table_length,
65 int checked_exceptions_length,
66 TRAPS) {
67 assert(!access_flags.is_native() || byte_code_size == 0,
68 "native methods should not contain byte codes");
69 ConstMethod* cm = ConstMethod::allocate(loader_data,
70 byte_code_size,
71 compressed_line_number_size,
72 localvariable_table_length,
73 exception_table_length,
74 checked_exceptions_length,
75 CHECK_NULL);
77 int size = Method::size(access_flags.is_native());
79 return new (loader_data, size, false, THREAD) Method(cm, access_flags, size);
80 }
82 Method::Method(ConstMethod* xconst,
83 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_name_index(0);
89 set_signature_index(0);
90 #ifdef CC_INTERP
91 set_result_index(T_VOID);
92 #endif
93 set_constants(NULL);
94 set_max_stack(0);
95 set_max_locals(0);
96 set_intrinsic_id(vmIntrinsics::_none);
97 set_jfr_towrite(false);
98 set_method_data(NULL);
99 set_interpreter_throwout_count(0);
100 set_vtable_index(Method::garbage_vtable_index);
102 // Fix and bury in Method*
103 set_interpreter_entry(NULL); // sets i2i entry and from_int
104 set_adapter_entry(NULL);
105 clear_code(); // from_c/from_i get set to c2i/i2i
107 if (access_flags.is_native()) {
108 clear_native_function();
109 set_signature_handler(NULL);
110 }
112 NOT_PRODUCT(set_compiled_invocation_count(0);)
113 set_interpreter_invocation_count(0);
114 invocation_counter()->init();
115 backedge_counter()->init();
116 clear_number_of_breakpoints();
118 #ifdef TIERED
119 set_rate(0);
120 set_prev_event_count(0);
121 set_prev_time(0);
122 #endif
123 }
125 // Release Method*. The nmethod will be gone when we get here because
126 // we've walked the code cache.
127 void Method::deallocate_contents(ClassLoaderData* loader_data) {
128 MetadataFactory::free_metadata(loader_data, constMethod());
129 set_constMethod(NULL);
130 MetadataFactory::free_metadata(loader_data, method_data());
131 set_method_data(NULL);
132 // The nmethod will be gone when we get here.
133 if (code() != NULL) _code = NULL;
134 }
136 address Method::get_i2c_entry() {
137 assert(_adapter != NULL, "must have");
138 return _adapter->get_i2c_entry();
139 }
141 address Method::get_c2i_entry() {
142 assert(_adapter != NULL, "must have");
143 return _adapter->get_c2i_entry();
144 }
146 address Method::get_c2i_unverified_entry() {
147 assert(_adapter != NULL, "must have");
148 return _adapter->get_c2i_unverified_entry();
149 }
151 char* Method::name_and_sig_as_C_string() const {
152 return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature());
153 }
155 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
156 return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature(), buf, size);
157 }
159 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
160 const char* klass_name = klass->external_name();
161 int klass_name_len = (int)strlen(klass_name);
162 int method_name_len = method_name->utf8_length();
163 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
164 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
165 strcpy(dest, klass_name);
166 dest[klass_name_len] = '.';
167 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
168 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
169 dest[len] = 0;
170 return dest;
171 }
173 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
174 Symbol* klass_name = klass->name();
175 klass_name->as_klass_external_name(buf, size);
176 int len = (int)strlen(buf);
178 if (len < size - 1) {
179 buf[len++] = '.';
181 method_name->as_C_string(&(buf[len]), size - len);
182 len = (int)strlen(buf);
184 signature->as_C_string(&(buf[len]), size - len);
185 }
187 return buf;
188 }
190 int Method::fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS) {
191 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
192 // access exception table
193 ExceptionTable table(this);
194 int length = table.length();
195 // iterate through all entries sequentially
196 constantPoolHandle pool(THREAD, constants());
197 for (int i = 0; i < length; i ++) {
198 //reacquire the table in case a GC happened
199 ExceptionTable table(this);
200 int beg_bci = table.start_pc(i);
201 int end_bci = table.end_pc(i);
202 assert(beg_bci <= end_bci, "inconsistent exception table");
203 if (beg_bci <= throw_bci && throw_bci < end_bci) {
204 // exception handler bci range covers throw_bci => investigate further
205 int handler_bci = table.handler_pc(i);
206 int klass_index = table.catch_type_index(i);
207 if (klass_index == 0) {
208 return handler_bci;
209 } else if (ex_klass.is_null()) {
210 return handler_bci;
211 } else {
212 // we know the exception class => get the constraint class
213 // this may require loading of the constraint class; if verification
214 // fails or some other exception occurs, return handler_bci
215 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
216 KlassHandle klass = KlassHandle(THREAD, k);
217 assert(klass.not_null(), "klass not loaded");
218 if (ex_klass->is_subtype_of(klass())) {
219 return handler_bci;
220 }
221 }
222 }
223 }
225 return -1;
226 }
228 void Method::mask_for(int bci, InterpreterOopMap* mask) {
230 Thread* myThread = Thread::current();
231 methodHandle h_this(myThread, this);
232 #ifdef ASSERT
233 bool has_capability = myThread->is_VM_thread() ||
234 myThread->is_ConcurrentGC_thread() ||
235 myThread->is_GC_task_thread();
237 if (!has_capability) {
238 if (!VerifyStack && !VerifyLastFrame) {
239 // verify stack calls this outside VM thread
240 warning("oopmap should only be accessed by the "
241 "VM, GC task or CMS threads (or during debugging)");
242 InterpreterOopMap local_mask;
243 InstanceKlass::cast(method_holder())->mask_for(h_this, bci, &local_mask);
244 local_mask.print();
245 }
246 }
247 #endif
248 InstanceKlass::cast(method_holder())->mask_for(h_this, bci, mask);
249 return;
250 }
253 int Method::bci_from(address bcp) const {
254 #ifdef ASSERT
255 { ResourceMark rm;
256 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
257 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string()));
258 }
259 #endif
260 return bcp - code_base();
261 }
264 // Return (int)bcx if it appears to be a valid BCI.
265 // Return bci_from((address)bcx) if it appears to be a valid BCP.
266 // Return -1 otherwise.
267 // Used by profiling code, when invalid data is a possibility.
268 // The caller is responsible for validating the Method* itself.
269 int Method::validate_bci_from_bcx(intptr_t bcx) const {
270 // keep bci as -1 if not a valid bci
271 int bci = -1;
272 if (bcx == 0 || (address)bcx == code_base()) {
273 // code_size() may return 0 and we allow 0 here
274 // the method may be native
275 bci = 0;
276 } else if (frame::is_bci(bcx)) {
277 if (bcx < code_size()) {
278 bci = (int)bcx;
279 }
280 } else if (contains((address)bcx)) {
281 bci = (address)bcx - code_base();
282 }
283 // Assert that if we have dodged any asserts, bci is negative.
284 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
285 return bci;
286 }
288 address Method::bcp_from(int bci) const {
289 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci");
290 address bcp = code_base() + bci;
291 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
292 return bcp;
293 }
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 }
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 }
312 void Method::set_interpreter_kind() {
313 int kind = Interpreter::method_kind(this);
314 assert(kind != Interpreter::invalid,
315 "interpreter entry must be valid");
316 set_interpreter_kind(kind);
317 }
320 // Attempt to return method oop to original state. Clear any pointers
321 // (to objects outside the shared spaces). We won't be able to predict
322 // where they should point in a new JVM. Further initialize some
323 // entries now in order allow them to be write protected later.
325 void Method::remove_unshareable_info() {
326 unlink_method();
327 set_interpreter_kind();
328 }
331 bool Method::was_executed_more_than(int n) {
332 // Invocation counter is reset when the Method* is compiled.
333 // If the method has compiled code we therefore assume it has
334 // be excuted more than n times.
335 if (is_accessor() || is_empty_method() || (code() != NULL)) {
336 // interpreter doesn't bump invocation counter of trivial methods
337 // compiler does not bump invocation counter of compiled methods
338 return true;
339 }
340 else if (_invocation_counter.carry() || (method_data() != NULL && method_data()->invocation_counter()->carry())) {
341 // The carry bit is set when the counter overflows and causes
342 // a compilation to occur. We don't know how many times
343 // the counter has been reset, so we simply assume it has
344 // been executed more than n times.
345 return true;
346 } else {
347 return invocation_count() > n;
348 }
349 }
351 #ifndef PRODUCT
352 void Method::print_invocation_count() {
353 if (is_static()) tty->print("static ");
354 if (is_final()) tty->print("final ");
355 if (is_synchronized()) tty->print("synchronized ");
356 if (is_native()) tty->print("native ");
357 method_holder()->name()->print_symbol_on(tty);
358 tty->print(".");
359 name()->print_symbol_on(tty);
360 signature()->print_symbol_on(tty);
362 if (WizardMode) {
363 // dump the size of the byte codes
364 tty->print(" {%d}", code_size());
365 }
366 tty->cr();
368 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
369 tty->print_cr (" invocation_counter: %8d ", invocation_count());
370 tty->print_cr (" backedge_counter: %8d ", backedge_count());
371 if (CountCompiledCalls) {
372 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
373 }
375 }
376 #endif
378 // Build a MethodData* object to hold information about this method
379 // collected in the interpreter.
380 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
381 // Do not profile method if current thread holds the pending list lock,
382 // which avoids deadlock for acquiring the MethodData_lock.
383 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
384 return;
385 }
387 // Grab a lock here to prevent multiple
388 // MethodData*s from being created.
389 MutexLocker ml(MethodData_lock, THREAD);
390 if (method->method_data() == NULL) {
391 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
392 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);
393 method->set_method_data(method_data);
394 if (PrintMethodData && (Verbose || WizardMode)) {
395 ResourceMark rm(THREAD);
396 tty->print("build_interpreter_method_data for ");
397 method->print_name(tty);
398 tty->cr();
399 // At the end of the run, the MDO, full of data, will be dumped.
400 }
401 }
402 }
404 void Method::cleanup_inline_caches() {
405 // The current system doesn't use inline caches in the interpreter
406 // => nothing to do (keep this method around for future use)
407 }
410 int Method::extra_stack_words() {
411 // not an inline function, to avoid a header dependency on Interpreter
412 return extra_stack_entries() * Interpreter::stackElementSize;
413 }
416 void Method::compute_size_of_parameters(Thread *thread) {
417 ArgumentSizeComputer asc(signature());
418 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
419 }
421 #ifdef CC_INTERP
422 void Method::set_result_index(BasicType type) {
423 _result_index = Interpreter::BasicType_as_index(type);
424 }
425 #endif
427 BasicType Method::result_type() const {
428 ResultTypeFinder rtf(signature());
429 return rtf.type();
430 }
433 bool Method::is_empty_method() const {
434 return code_size() == 1
435 && *code_base() == Bytecodes::_return;
436 }
439 bool Method::is_vanilla_constructor() const {
440 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
441 // which only calls the superclass vanilla constructor and possibly does stores of
442 // zero constants to local fields:
443 //
444 // aload_0
445 // invokespecial
446 // indexbyte1
447 // indexbyte2
448 //
449 // followed by an (optional) sequence of:
450 //
451 // aload_0
452 // aconst_null / iconst_0 / fconst_0 / dconst_0
453 // putfield
454 // indexbyte1
455 // indexbyte2
456 //
457 // followed by:
458 //
459 // return
461 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
462 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
463 int size = code_size();
464 // Check if size match
465 if (size == 0 || size % 5 != 0) return false;
466 address cb = code_base();
467 int last = size - 1;
468 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
469 // Does not call superclass default constructor
470 return false;
471 }
472 // Check optional sequence
473 for (int i = 4; i < last; i += 5) {
474 if (cb[i] != Bytecodes::_aload_0) return false;
475 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
476 if (cb[i+2] != Bytecodes::_putfield) return false;
477 }
478 return true;
479 }
482 bool Method::compute_has_loops_flag() {
483 BytecodeStream bcs(this);
484 Bytecodes::Code bc;
486 while ((bc = bcs.next()) >= 0) {
487 switch( bc ) {
488 case Bytecodes::_ifeq:
489 case Bytecodes::_ifnull:
490 case Bytecodes::_iflt:
491 case Bytecodes::_ifle:
492 case Bytecodes::_ifne:
493 case Bytecodes::_ifnonnull:
494 case Bytecodes::_ifgt:
495 case Bytecodes::_ifge:
496 case Bytecodes::_if_icmpeq:
497 case Bytecodes::_if_icmpne:
498 case Bytecodes::_if_icmplt:
499 case Bytecodes::_if_icmpgt:
500 case Bytecodes::_if_icmple:
501 case Bytecodes::_if_icmpge:
502 case Bytecodes::_if_acmpeq:
503 case Bytecodes::_if_acmpne:
504 case Bytecodes::_goto:
505 case Bytecodes::_jsr:
506 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
507 break;
509 case Bytecodes::_goto_w:
510 case Bytecodes::_jsr_w:
511 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
512 break;
513 }
514 }
515 _access_flags.set_loops_flag_init();
516 return _access_flags.has_loops();
517 }
520 bool Method::is_final_method() const {
521 // %%% Should return true for private methods also,
522 // since there is no way to override them.
523 return is_final() || Klass::cast(method_holder())->is_final();
524 }
527 bool Method::is_strict_method() const {
528 return is_strict();
529 }
532 bool Method::can_be_statically_bound() const {
533 if (is_final_method()) return true;
534 return vtable_index() == nonvirtual_vtable_index;
535 }
538 bool Method::is_accessor() const {
539 if (code_size() != 5) return false;
540 if (size_of_parameters() != 1) return false;
541 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
542 if (java_code_at(1) != Bytecodes::_getfield) return false;
543 if (java_code_at(4) != Bytecodes::_areturn &&
544 java_code_at(4) != Bytecodes::_ireturn ) return false;
545 return true;
546 }
549 bool Method::is_initializer() const {
550 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
551 }
553 bool Method::has_valid_initializer_flags() const {
554 return (is_static() ||
555 InstanceKlass::cast(method_holder())->major_version() < 51);
556 }
558 bool Method::is_static_initializer() const {
559 // For classfiles version 51 or greater, ensure that the clinit method is
560 // static. Non-static methods with the name "<clinit>" are not static
561 // initializers. (older classfiles exempted for backward compatibility)
562 return name() == vmSymbols::class_initializer_name() &&
563 has_valid_initializer_flags();
564 }
567 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) {
568 int length = this_oop->checked_exceptions_length();
569 if (length == 0) { // common case
570 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
571 } else {
572 methodHandle h_this(THREAD, this_oop);
573 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
574 objArrayHandle mirrors (THREAD, m_oop);
575 for (int i = 0; i < length; i++) {
576 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
577 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
578 assert(Klass::cast(k)->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
579 mirrors->obj_at_put(i, Klass::cast(k)->java_mirror());
580 }
581 return mirrors;
582 }
583 };
586 int Method::line_number_from_bci(int bci) const {
587 if (bci == SynchronizationEntryBCI) bci = 0;
588 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
589 int best_bci = 0;
590 int best_line = -1;
592 if (has_linenumber_table()) {
593 // The line numbers are a short array of 2-tuples [start_pc, line_number].
594 // Not necessarily sorted and not necessarily one-to-one.
595 CompressedLineNumberReadStream stream(compressed_linenumber_table());
596 while (stream.read_pair()) {
597 if (stream.bci() == bci) {
598 // perfect match
599 return stream.line();
600 } else {
601 // update best_bci/line
602 if (stream.bci() < bci && stream.bci() >= best_bci) {
603 best_bci = stream.bci();
604 best_line = stream.line();
605 }
606 }
607 }
608 }
609 return best_line;
610 }
613 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
614 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
615 Thread *thread = Thread::current();
616 Symbol* klass_name = constants()->klass_name_at(klass_index);
617 Handle loader(thread, InstanceKlass::cast(method_holder())->class_loader());
618 Handle prot (thread, Klass::cast(method_holder())->protection_domain());
619 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
620 } else {
621 return true;
622 }
623 }
626 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
627 int klass_index = constants()->klass_ref_index_at(refinfo_index);
628 if (must_be_resolved) {
629 // Make sure klass is resolved in constantpool.
630 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
631 }
632 return is_klass_loaded_by_klass_index(klass_index);
633 }
636 void Method::set_native_function(address function, bool post_event_flag) {
637 assert(function != NULL, "use clear_native_function to unregister natives");
638 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
639 address* native_function = native_function_addr();
641 // We can see racers trying to place the same native function into place. Once
642 // is plenty.
643 address current = *native_function;
644 if (current == function) return;
645 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
646 function != NULL) {
647 // native_method_throw_unsatisfied_link_error_entry() should only
648 // be passed when post_event_flag is false.
649 assert(function !=
650 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
651 "post_event_flag mis-match");
653 // post the bind event, and possible change the bind function
654 JvmtiExport::post_native_method_bind(this, &function);
655 }
656 *native_function = function;
657 // This function can be called more than once. We must make sure that we always
658 // use the latest registered method -> check if a stub already has been generated.
659 // If so, we have to make it not_entrant.
660 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
661 if (nm != NULL) {
662 nm->make_not_entrant();
663 }
664 }
667 bool Method::has_native_function() const {
668 if (is_method_handle_intrinsic())
669 return false; // special-cased in SharedRuntime::generate_native_wrapper
670 address func = native_function();
671 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
672 }
675 void Method::clear_native_function() {
676 // Note: is_method_handle_intrinsic() is allowed here.
677 set_native_function(
678 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
679 !native_bind_event_is_interesting);
680 clear_code();
681 }
683 address Method::critical_native_function() {
684 methodHandle mh(this);
685 return NativeLookup::lookup_critical_entry(mh);
686 }
689 void Method::set_signature_handler(address handler) {
690 address* signature_handler = signature_handler_addr();
691 *signature_handler = handler;
692 }
695 bool Method::is_not_compilable(int comp_level) const {
696 if (number_of_breakpoints() > 0) {
697 return true;
698 }
699 if (is_method_handle_intrinsic()) {
700 return !is_synthetic(); // the generated adapters must be compiled
701 }
702 if (comp_level == CompLevel_any) {
703 return is_not_c1_compilable() || is_not_c2_compilable();
704 }
705 if (is_c1_compile(comp_level)) {
706 return is_not_c1_compilable();
707 }
708 if (is_c2_compile(comp_level)) {
709 return is_not_c2_compilable();
710 }
711 return false;
712 }
714 // call this when compiler finds that this method is not compilable
715 void Method::set_not_compilable(int comp_level, bool report) {
716 if (PrintCompilation && report) {
717 ttyLocker ttyl;
718 tty->print("made not compilable ");
719 this->print_short_name(tty);
720 int size = this->code_size();
721 if (size > 0)
722 tty->print(" (%d bytes)", size);
723 tty->cr();
724 }
725 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
726 ttyLocker ttyl;
727 xtty->begin_elem("make_not_compilable thread='%d'", (int) os::current_thread_id());
728 xtty->method(this);
729 xtty->stamp();
730 xtty->end_elem();
731 }
732 if (comp_level == CompLevel_all) {
733 set_not_c1_compilable();
734 set_not_c2_compilable();
735 } else {
736 if (is_c1_compile(comp_level)) {
737 set_not_c1_compilable();
738 } else
739 if (is_c2_compile(comp_level)) {
740 set_not_c2_compilable();
741 }
742 }
743 CompilationPolicy::policy()->disable_compilation(this);
744 }
746 // Revert to using the interpreter and clear out the nmethod
747 void Method::clear_code() {
749 // this may be NULL if c2i adapters have not been made yet
750 // Only should happen at allocate time.
751 if (_adapter == NULL) {
752 _from_compiled_entry = NULL;
753 } else {
754 _from_compiled_entry = _adapter->get_c2i_entry();
755 }
756 OrderAccess::storestore();
757 _from_interpreted_entry = _i2i_entry;
758 OrderAccess::storestore();
759 _code = NULL;
760 }
762 // Called by class data sharing to remove any entry points (which are not shared)
763 void Method::unlink_method() {
764 _code = NULL;
765 _i2i_entry = NULL;
766 _from_interpreted_entry = NULL;
767 if (is_native()) {
768 *native_function_addr() = NULL;
769 set_signature_handler(NULL);
770 }
771 NOT_PRODUCT(set_compiled_invocation_count(0);)
772 invocation_counter()->reset();
773 backedge_counter()->reset();
774 _adapter = NULL;
775 _from_compiled_entry = NULL;
776 assert(_method_data == NULL, "unexpected method data?");
777 set_method_data(NULL);
778 set_interpreter_throwout_count(0);
779 set_interpreter_invocation_count(0);
780 }
782 // Called when the method_holder is getting linked. Setup entrypoints so the method
783 // is ready to be called from interpreter, compiler, and vtables.
784 void Method::link_method(methodHandle h_method, TRAPS) {
785 // If the code cache is full, we may reenter this function for the
786 // leftover methods that weren't linked.
787 if (_i2i_entry != NULL) return;
789 assert(_adapter == NULL, "init'd to NULL" );
790 assert( _code == NULL, "nothing compiled yet" );
792 // Setup interpreter entrypoint
793 assert(this == h_method(), "wrong h_method()" );
794 address entry = Interpreter::entry_for_method(h_method);
795 assert(entry != NULL, "interpreter entry must be non-null");
796 // Sets both _i2i_entry and _from_interpreted_entry
797 set_interpreter_entry(entry);
798 if (is_native() && !is_method_handle_intrinsic()) {
799 set_native_function(
800 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
801 !native_bind_event_is_interesting);
802 }
804 // Setup compiler entrypoint. This is made eagerly, so we do not need
805 // special handling of vtables. An alternative is to make adapters more
806 // lazily by calling make_adapter() from from_compiled_entry() for the
807 // normal calls. For vtable calls life gets more complicated. When a
808 // call-site goes mega-morphic we need adapters in all methods which can be
809 // called from the vtable. We need adapters on such methods that get loaded
810 // later. Ditto for mega-morphic itable calls. If this proves to be a
811 // problem we'll make these lazily later.
812 (void) make_adapters(h_method, CHECK);
814 // ONLY USE the h_method now as make_adapter may have blocked
816 }
818 address Method::make_adapters(methodHandle mh, TRAPS) {
819 // Adapters for compiled code are made eagerly here. They are fairly
820 // small (generally < 100 bytes) and quick to make (and cached and shared)
821 // so making them eagerly shouldn't be too expensive.
822 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
823 if (adapter == NULL ) {
824 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
825 }
827 mh->set_adapter_entry(adapter);
828 mh->_from_compiled_entry = adapter->get_c2i_entry();
829 return adapter->get_c2i_entry();
830 }
832 // The verified_code_entry() must be called when a invoke is resolved
833 // on this method.
835 // It returns the compiled code entry point, after asserting not null.
836 // This function is called after potential safepoints so that nmethod
837 // or adapter that it points to is still live and valid.
838 // This function must not hit a safepoint!
839 address Method::verified_code_entry() {
840 debug_only(No_Safepoint_Verifier nsv;)
841 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
842 if (code == NULL && UseCodeCacheFlushing) {
843 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this);
844 if (saved_code != NULL) {
845 methodHandle method(this);
846 assert( ! saved_code->is_osr_method(), "should not get here for osr" );
847 set_code( method, saved_code );
848 }
849 }
851 assert(_from_compiled_entry != NULL, "must be set");
852 return _from_compiled_entry;
853 }
855 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
856 // (could be racing a deopt).
857 // Not inline to avoid circular ref.
858 bool Method::check_code() const {
859 // cached in a register or local. There's a race on the value of the field.
860 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
861 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
862 }
864 // Install compiled code. Instantly it can execute.
865 void Method::set_code(methodHandle mh, nmethod *code) {
866 assert( code, "use clear_code to remove code" );
867 assert( mh->check_code(), "" );
869 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
871 // These writes must happen in this order, because the interpreter will
872 // directly jump to from_interpreted_entry which jumps to an i2c adapter
873 // which jumps to _from_compiled_entry.
874 mh->_code = code; // Assign before allowing compiled code to exec
876 int comp_level = code->comp_level();
877 // In theory there could be a race here. In practice it is unlikely
878 // and not worth worrying about.
879 if (comp_level > mh->highest_comp_level()) {
880 mh->set_highest_comp_level(comp_level);
881 }
883 OrderAccess::storestore();
884 #ifdef SHARK
885 mh->_from_interpreted_entry = code->insts_begin();
886 #else //!SHARK
887 mh->_from_compiled_entry = code->verified_entry_point();
888 OrderAccess::storestore();
889 // Instantly compiled code can execute.
890 if (!mh->is_method_handle_intrinsic())
891 mh->_from_interpreted_entry = mh->get_i2c_entry();
892 #endif //!SHARK
893 }
896 bool Method::is_overridden_in(Klass* k) const {
897 InstanceKlass* ik = InstanceKlass::cast(k);
899 if (ik->is_interface()) return false;
901 // If method is an interface, we skip it - except if it
902 // is a miranda method
903 if (InstanceKlass::cast(method_holder())->is_interface()) {
904 // Check that method is not a miranda method
905 if (ik->lookup_method(name(), signature()) == NULL) {
906 // No implementation exist - so miranda method
907 return false;
908 }
909 return true;
910 }
912 assert(ik->is_subclass_of(method_holder()), "should be subklass");
913 assert(ik->vtable() != NULL, "vtable should exist");
914 if (vtable_index() == nonvirtual_vtable_index) {
915 return false;
916 } else {
917 Method* vt_m = ik->method_at_vtable(vtable_index());
918 return vt_m != this;
919 }
920 }
923 // give advice about whether this Method* should be cached or not
924 bool Method::should_not_be_cached() const {
925 if (is_old()) {
926 // This method has been redefined. It is either EMCP or obsolete
927 // and we don't want to cache it because that would pin the method
928 // down and prevent it from being collectible if and when it
929 // finishes executing.
930 return true;
931 }
933 // caching this method should be just fine
934 return false;
935 }
937 // Constant pool structure for invoke methods:
938 enum {
939 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
940 _imcp_invoke_signature, // utf8: (variable Symbol*)
941 _imcp_limit
942 };
944 // Test if this method is an MH adapter frame generated by Java code.
945 // Cf. java/lang/invoke/InvokerBytecodeGenerator
946 bool Method::is_compiled_lambda_form() const {
947 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
948 }
950 // Test if this method is an internal MH primitive method.
951 bool Method::is_method_handle_intrinsic() const {
952 vmIntrinsics::ID iid = intrinsic_id();
953 return (MethodHandles::is_signature_polymorphic(iid) &&
954 MethodHandles::is_signature_polymorphic_intrinsic(iid));
955 }
957 bool Method::has_member_arg() const {
958 vmIntrinsics::ID iid = intrinsic_id();
959 return (MethodHandles::is_signature_polymorphic(iid) &&
960 MethodHandles::has_member_arg(iid));
961 }
963 // Make an instance of a signature-polymorphic internal MH primitive.
964 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
965 Symbol* signature,
966 TRAPS) {
967 ResourceMark rm;
968 methodHandle empty;
970 KlassHandle holder = SystemDictionary::MethodHandle_klass();
971 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
972 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
973 if (TraceMethodHandles) {
974 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
975 }
977 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
978 name->increment_refcount();
979 signature->increment_refcount();
981 int cp_length = _imcp_limit;
982 ClassLoaderData* loader_data = holder->class_loader_data();
983 constantPoolHandle cp;
984 {
985 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
986 cp = constantPoolHandle(THREAD, cp_oop);
987 }
988 cp->set_pool_holder(holder());
989 cp->symbol_at_put(_imcp_invoke_name, name);
990 cp->symbol_at_put(_imcp_invoke_signature, signature);
991 cp->set_preresolution();
993 // decide on access bits: public or not?
994 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
995 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
996 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
997 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
999 methodHandle m;
1000 {
1001 Method* m_oop = Method::allocate(loader_data, 0, accessFlags_from(flags_bits),
1002 0, 0, 0, 0, CHECK_(empty));
1003 m = methodHandle(THREAD, m_oop);
1004 }
1005 m->set_constants(cp());
1006 m->set_name_index(_imcp_invoke_name);
1007 m->set_signature_index(_imcp_invoke_signature);
1008 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1009 assert(m->signature() == signature, "");
1010 #ifdef CC_INTERP
1011 ResultTypeFinder rtf(signature);
1012 m->set_result_index(rtf.type());
1013 #endif
1014 m->compute_size_of_parameters(THREAD);
1015 m->init_intrinsic_id();
1016 assert(m->is_method_handle_intrinsic(), "");
1017 #ifdef ASSERT
1018 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1019 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1020 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1021 #endif //ASSERT
1023 // Finally, set up its entry points.
1024 assert(m->can_be_statically_bound(), "");
1025 m->set_vtable_index(Method::nonvirtual_vtable_index);
1026 m->link_method(m, CHECK_(empty));
1028 if (TraceMethodHandles && (Verbose || WizardMode))
1029 m->print_on(tty);
1031 return m;
1032 }
1034 Klass* Method::check_non_bcp_klass(Klass* klass) {
1035 if (klass != NULL && Klass::cast(klass)->class_loader() != NULL) {
1036 if (Klass::cast(klass)->oop_is_objArray())
1037 klass = objArrayKlass::cast(klass)->bottom_klass();
1038 return klass;
1039 }
1040 return NULL;
1041 }
1044 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1045 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1046 // Code below does not work for native methods - they should never get rewritten anyway
1047 assert(!m->is_native(), "cannot rewrite native methods");
1048 // Allocate new Method*
1049 AccessFlags flags = m->access_flags();
1050 int checked_exceptions_len = m->checked_exceptions_length();
1051 int localvariable_len = m->localvariable_table_length();
1052 int exception_table_len = m->exception_table_length();
1054 ClassLoaderData* loader_data = m()->method_holder()->class_loader_data();
1055 Method* newm_oop = Method::allocate(loader_data,
1056 new_code_length,
1057 flags,
1058 new_compressed_linenumber_size,
1059 localvariable_len,
1060 exception_table_len,
1061 checked_exceptions_len,
1062 CHECK_(methodHandle()));
1063 methodHandle newm (THREAD, newm_oop);
1064 int new_method_size = newm->method_size();
1066 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1067 ConstMethod* newcm = newm->constMethod();
1068 int new_const_method_size = newm->constMethod()->size();
1070 memcpy(newm(), m(), sizeof(Method));
1072 // Create shallow copy of ConstMethod.
1073 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1075 // Reset correct method/const method, method size, and parameter info
1076 newm->set_constMethod(newcm);
1077 newm->constMethod()->set_code_size(new_code_length);
1078 newm->constMethod()->set_constMethod_size(new_const_method_size);
1079 newm->set_method_size(new_method_size);
1080 assert(newm->code_size() == new_code_length, "check");
1081 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1082 assert(newm->exception_table_length() == exception_table_len, "check");
1083 assert(newm->localvariable_table_length() == localvariable_len, "check");
1084 // Copy new byte codes
1085 memcpy(newm->code_base(), new_code, new_code_length);
1086 // Copy line number table
1087 if (new_compressed_linenumber_size > 0) {
1088 memcpy(newm->compressed_linenumber_table(),
1089 new_compressed_linenumber_table,
1090 new_compressed_linenumber_size);
1091 }
1092 // Copy checked_exceptions
1093 if (checked_exceptions_len > 0) {
1094 memcpy(newm->checked_exceptions_start(),
1095 m->checked_exceptions_start(),
1096 checked_exceptions_len * sizeof(CheckedExceptionElement));
1097 }
1098 // Copy exception table
1099 if (exception_table_len > 0) {
1100 memcpy(newm->exception_table_start(),
1101 m->exception_table_start(),
1102 exception_table_len * sizeof(ExceptionTableElement));
1103 }
1104 // Copy local variable number table
1105 if (localvariable_len > 0) {
1106 memcpy(newm->localvariable_table_start(),
1107 m->localvariable_table_start(),
1108 localvariable_len * sizeof(LocalVariableTableElement));
1109 }
1110 // Copy stackmap table
1111 if (m->has_stackmap_table()) {
1112 int code_attribute_length = m->stackmap_data()->length();
1113 Array<u1>* stackmap_data =
1114 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1115 memcpy((void*)stackmap_data->adr_at(0),
1116 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1117 newm->set_stackmap_data(stackmap_data);
1118 }
1120 return newm;
1121 }
1123 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1124 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1125 // because we are not loading from core libraries
1126 if (InstanceKlass::cast(holder)->class_loader() != NULL)
1127 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1129 // see if the klass name is well-known:
1130 Symbol* klass_name = InstanceKlass::cast(holder)->name();
1131 return vmSymbols::find_sid(klass_name);
1132 }
1134 void Method::init_intrinsic_id() {
1135 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1136 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1137 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1138 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1140 // the klass name is well-known:
1141 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1142 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1144 // ditto for method and signature:
1145 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1146 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1147 && name_id == vmSymbols::NO_SID)
1148 return;
1149 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1150 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1151 && sig_id == vmSymbols::NO_SID) return;
1152 jshort flags = access_flags().as_short();
1154 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1155 if (id != vmIntrinsics::_none) {
1156 set_intrinsic_id(id);
1157 return;
1158 }
1160 // A few slightly irregular cases:
1161 switch (klass_id) {
1162 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1163 // Second chance: check in regular Math.
1164 switch (name_id) {
1165 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1166 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1167 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1168 // pretend it is the corresponding method in the non-strict class:
1169 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1170 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1171 break;
1172 }
1173 break;
1175 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1176 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1177 if (!is_native()) break;
1178 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1179 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1180 id = vmIntrinsics::_none;
1181 break;
1182 }
1184 if (id != vmIntrinsics::_none) {
1185 // Set up its iid. It is an alias method.
1186 set_intrinsic_id(id);
1187 return;
1188 }
1189 }
1191 // These two methods are static since a GC may move the Method
1192 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1193 if (THREAD->is_Compiler_thread()) {
1194 // There is nothing useful this routine can do from within the Compile thread.
1195 // Hopefully, the signature contains only well-known classes.
1196 // We could scan for this and return true/false, but the caller won't care.
1197 return false;
1198 }
1199 bool sig_is_loaded = true;
1200 Handle class_loader(THREAD, InstanceKlass::cast(m->method_holder())->class_loader());
1201 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain());
1202 ResourceMark rm(THREAD);
1203 Symbol* signature = m->signature();
1204 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1205 if (ss.is_object()) {
1206 Symbol* sym = ss.as_symbol(CHECK_(false));
1207 Symbol* name = sym;
1208 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1209 protection_domain, THREAD);
1210 // We are loading classes eagerly. If a ClassNotFoundException or
1211 // a LinkageError was generated, be sure to ignore it.
1212 if (HAS_PENDING_EXCEPTION) {
1213 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1214 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1215 CLEAR_PENDING_EXCEPTION;
1216 } else {
1217 return false;
1218 }
1219 }
1220 if( klass == NULL) { sig_is_loaded = false; }
1221 }
1222 }
1223 return sig_is_loaded;
1224 }
1226 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1227 Handle class_loader(THREAD, InstanceKlass::cast(m->method_holder())->class_loader());
1228 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain());
1229 ResourceMark rm(THREAD);
1230 Symbol* signature = m->signature();
1231 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1232 if (ss.type() == T_OBJECT) {
1233 Symbol* name = ss.as_symbol_or_null();
1234 if (name == NULL) return true;
1235 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1236 if (klass == NULL) return true;
1237 }
1238 }
1239 return false;
1240 }
1242 // Exposed so field engineers can debug VM
1243 void Method::print_short_name(outputStream* st) {
1244 ResourceMark rm;
1245 #ifdef PRODUCT
1246 st->print(" %s::", method_holder()->external_name());
1247 #else
1248 st->print(" %s::", method_holder()->internal_name());
1249 #endif
1250 name()->print_symbol_on(st);
1251 if (WizardMode) signature()->print_symbol_on(st);
1252 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1253 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1254 }
1256 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1257 static void reorder_based_on_method_index(Array<Method*>* methods,
1258 Array<AnnotationArray*>* annotations,
1259 GrowableArray<AnnotationArray*>* temp_array) {
1260 if (annotations == NULL) {
1261 return;
1262 }
1264 int length = methods->length();
1265 int i;
1266 // Copy to temp array
1267 temp_array->clear();
1268 for (i = 0; i < length; i++) {
1269 temp_array->append(annotations->at(i));
1270 }
1272 // Copy back using old method indices
1273 for (i = 0; i < length; i++) {
1274 Method* m = methods->at(i);
1275 annotations->at_put(i, temp_array->at(m->method_idnum()));
1276 }
1277 }
1279 // Comparer for sorting an object array containing
1280 // Method*s.
1281 static int method_comparator(Method* a, Method* b) {
1282 return a->name()->fast_compare(b->name());
1283 }
1285 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1286 void Method::sort_methods(Array<Method*>* methods,
1287 Array<AnnotationArray*>* methods_annotations,
1288 Array<AnnotationArray*>* methods_parameter_annotations,
1289 Array<AnnotationArray*>* methods_default_annotations,
1290 bool idempotent) {
1291 int length = methods->length();
1292 if (length > 1) {
1293 bool do_annotations = false;
1294 if (methods_annotations != NULL ||
1295 methods_parameter_annotations != NULL ||
1296 methods_default_annotations != NULL) {
1297 do_annotations = true;
1298 }
1299 if (do_annotations) {
1300 // Remember current method ordering so we can reorder annotations
1301 for (int i = 0; i < length; i++) {
1302 Method* m = methods->at(i);
1303 m->set_method_idnum(i);
1304 }
1305 }
1306 {
1307 No_Safepoint_Verifier nsv;
1308 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1309 }
1311 // Sort annotations if necessary
1312 assert(methods_annotations == NULL || methods_annotations->length() == methods->length(), "");
1313 assert(methods_parameter_annotations == NULL || methods_parameter_annotations->length() == methods->length(), "");
1314 assert(methods_default_annotations == NULL || methods_default_annotations->length() == methods->length(), "");
1315 if (do_annotations) {
1316 ResourceMark rm;
1317 // Allocate temporary storage
1318 GrowableArray<AnnotationArray*>* temp_array = new GrowableArray<AnnotationArray*>(length);
1319 reorder_based_on_method_index(methods, methods_annotations, temp_array);
1320 reorder_based_on_method_index(methods, methods_parameter_annotations, temp_array);
1321 reorder_based_on_method_index(methods, methods_default_annotations, temp_array);
1322 }
1324 // Reset method ordering
1325 for (int i = 0; i < length; i++) {
1326 Method* m = methods->at(i);
1327 m->set_method_idnum(i);
1328 }
1329 }
1330 }
1333 //-----------------------------------------------------------------------------------
1334 // Non-product code
1336 #ifndef PRODUCT
1337 class SignatureTypePrinter : public SignatureTypeNames {
1338 private:
1339 outputStream* _st;
1340 bool _use_separator;
1342 void type_name(const char* name) {
1343 if (_use_separator) _st->print(", ");
1344 _st->print(name);
1345 _use_separator = true;
1346 }
1348 public:
1349 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1350 _st = st;
1351 _use_separator = false;
1352 }
1354 void print_parameters() { _use_separator = false; iterate_parameters(); }
1355 void print_returntype() { _use_separator = false; iterate_returntype(); }
1356 };
1359 void Method::print_name(outputStream* st) {
1360 Thread *thread = Thread::current();
1361 ResourceMark rm(thread);
1362 SignatureTypePrinter sig(signature(), st);
1363 st->print("%s ", is_static() ? "static" : "virtual");
1364 sig.print_returntype();
1365 st->print(" %s.", method_holder()->internal_name());
1366 name()->print_symbol_on(st);
1367 st->print("(");
1368 sig.print_parameters();
1369 st->print(")");
1370 }
1373 void Method::print_codes_on(outputStream* st) const {
1374 print_codes_on(0, code_size(), st);
1375 }
1377 void Method::print_codes_on(int from, int to, outputStream* st) const {
1378 Thread *thread = Thread::current();
1379 ResourceMark rm(thread);
1380 methodHandle mh (thread, (Method*)this);
1381 BytecodeStream s(mh);
1382 s.set_interval(from, to);
1383 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1384 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1385 }
1386 #endif // not PRODUCT
1389 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1390 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1391 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1392 // as end-of-stream terminator.
1394 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1395 // bci and line number does not compress into single byte.
1396 // Write out escape character and use regular compression for bci and line number.
1397 write_byte((jubyte)0xFF);
1398 write_signed_int(bci_delta);
1399 write_signed_int(line_delta);
1400 }
1402 // See comment in method.hpp which explains why this exists.
1403 #if defined(_M_AMD64) && _MSC_VER >= 1400
1404 #pragma optimize("", off)
1405 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1406 write_pair_inline(bci, line);
1407 }
1408 #pragma optimize("", on)
1409 #endif
1411 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1412 _bci = 0;
1413 _line = 0;
1414 };
1417 bool CompressedLineNumberReadStream::read_pair() {
1418 jubyte next = read_byte();
1419 // Check for terminator
1420 if (next == 0) return false;
1421 if (next == 0xFF) {
1422 // Escape character, regular compression used
1423 _bci += read_signed_int();
1424 _line += read_signed_int();
1425 } else {
1426 // Single byte compression used
1427 _bci += next >> 3;
1428 _line += next & 0x7;
1429 }
1430 return true;
1431 }
1434 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1435 BreakpointInfo* bp = InstanceKlass::cast(method_holder())->breakpoints();
1436 for (; bp != NULL; bp = bp->next()) {
1437 if (bp->match(this, bci)) {
1438 return bp->orig_bytecode();
1439 }
1440 }
1441 ShouldNotReachHere();
1442 return Bytecodes::_shouldnotreachhere;
1443 }
1445 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1446 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1447 BreakpointInfo* bp = InstanceKlass::cast(method_holder())->breakpoints();
1448 for (; bp != NULL; bp = bp->next()) {
1449 if (bp->match(this, bci)) {
1450 bp->set_orig_bytecode(code);
1451 // and continue, in case there is more than one
1452 }
1453 }
1454 }
1456 void Method::set_breakpoint(int bci) {
1457 InstanceKlass* ik = InstanceKlass::cast(method_holder());
1458 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1459 bp->set_next(ik->breakpoints());
1460 ik->set_breakpoints(bp);
1461 // do this last:
1462 bp->set(this);
1463 }
1465 static void clear_matches(Method* m, int bci) {
1466 InstanceKlass* ik = InstanceKlass::cast(m->method_holder());
1467 BreakpointInfo* prev_bp = NULL;
1468 BreakpointInfo* next_bp;
1469 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1470 next_bp = bp->next();
1471 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1472 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1473 // do this first:
1474 bp->clear(m);
1475 // unhook it
1476 if (prev_bp != NULL)
1477 prev_bp->set_next(next_bp);
1478 else
1479 ik->set_breakpoints(next_bp);
1480 delete bp;
1481 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1482 // at same location. So we have multiple matching (method_index and bci)
1483 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1484 // breakpoint for clear_breakpoint request and keep all other method versions
1485 // BreakpointInfo for future clear_breakpoint request.
1486 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1487 // which is being called when class is unloaded. We delete all the Breakpoint
1488 // information for all versions of method. We may not correctly restore the original
1489 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1490 // so these methods won't be used anymore.
1491 if (bci >= 0) {
1492 break;
1493 }
1494 } else {
1495 // This one is a keeper.
1496 prev_bp = bp;
1497 }
1498 }
1499 }
1501 void Method::clear_breakpoint(int bci) {
1502 assert(bci >= 0, "");
1503 clear_matches(this, bci);
1504 }
1506 void Method::clear_all_breakpoints() {
1507 clear_matches(this, -1);
1508 }
1511 int Method::invocation_count() {
1512 if (TieredCompilation) {
1513 MethodData* const mdo = method_data();
1514 if (invocation_counter()->carry() || ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1515 return InvocationCounter::count_limit;
1516 } else {
1517 return invocation_counter()->count() + ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1518 }
1519 } else {
1520 return invocation_counter()->count();
1521 }
1522 }
1524 int Method::backedge_count() {
1525 if (TieredCompilation) {
1526 MethodData* const mdo = method_data();
1527 if (backedge_counter()->carry() || ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1528 return InvocationCounter::count_limit;
1529 } else {
1530 return backedge_counter()->count() + ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1531 }
1532 } else {
1533 return backedge_counter()->count();
1534 }
1535 }
1537 int Method::highest_comp_level() const {
1538 MethodData* mdo = method_data();
1539 if (mdo != NULL) {
1540 return mdo->highest_comp_level();
1541 } else {
1542 return CompLevel_none;
1543 }
1544 }
1546 int Method::highest_osr_comp_level() const {
1547 MethodData* mdo = method_data();
1548 if (mdo != NULL) {
1549 return mdo->highest_osr_comp_level();
1550 } else {
1551 return CompLevel_none;
1552 }
1553 }
1555 void Method::set_highest_comp_level(int level) {
1556 MethodData* mdo = method_data();
1557 if (mdo != NULL) {
1558 mdo->set_highest_comp_level(level);
1559 }
1560 }
1562 void Method::set_highest_osr_comp_level(int level) {
1563 MethodData* mdo = method_data();
1564 if (mdo != NULL) {
1565 mdo->set_highest_osr_comp_level(level);
1566 }
1567 }
1569 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1570 _bci = bci;
1571 _name_index = m->name_index();
1572 _signature_index = m->signature_index();
1573 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1574 if (_orig_bytecode == Bytecodes::_breakpoint)
1575 _orig_bytecode = m->orig_bytecode_at(_bci);
1576 _next = NULL;
1577 }
1579 void BreakpointInfo::set(Method* method) {
1580 #ifdef ASSERT
1581 {
1582 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1583 if (code == Bytecodes::_breakpoint)
1584 code = method->orig_bytecode_at(_bci);
1585 assert(orig_bytecode() == code, "original bytecode must be the same");
1586 }
1587 #endif
1588 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1589 method->incr_number_of_breakpoints();
1590 SystemDictionary::notice_modification();
1591 {
1592 // Deoptimize all dependents on this method
1593 Thread *thread = Thread::current();
1594 HandleMark hm(thread);
1595 methodHandle mh(thread, method);
1596 Universe::flush_dependents_on_method(mh);
1597 }
1598 }
1600 void BreakpointInfo::clear(Method* method) {
1601 *method->bcp_from(_bci) = orig_bytecode();
1602 assert(method->number_of_breakpoints() > 0, "must not go negative");
1603 method->decr_number_of_breakpoints();
1604 }
1606 // jmethodID handling
1608 // This is a block allocating object, sort of like JNIHandleBlock, only a
1609 // lot simpler. There aren't many of these, they aren't long, they are rarely
1610 // deleted and so we can do some suboptimal things.
1611 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1612 // never get rid of it.
1613 // It would be nice to be able to parameterize the number of methods for
1614 // the null_class_loader but then we'd have to turn this and ClassLoaderData
1615 // into templates.
1617 // I feel like this brain dead class should exist somewhere in the STL
1619 class JNIMethodBlock : public CHeapObj<mtClass> {
1620 enum { number_of_methods = 8 };
1622 Method* _methods[number_of_methods];
1623 int _top;
1624 JNIMethodBlock* _next;
1625 public:
1626 static Method* const _free_method;
1628 JNIMethodBlock() : _next(NULL), _top(0) {
1629 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method;
1630 }
1632 Method** add_method(Method* m) {
1633 if (_top < number_of_methods) {
1634 // top points to the next free entry.
1635 int i = _top;
1636 _methods[i] = m;
1637 _top++;
1638 return &_methods[i];
1639 } else if (_top == number_of_methods) {
1640 // if the next free entry ran off the block see if there's a free entry
1641 for (int i = 0; i< number_of_methods; i++) {
1642 if (_methods[i] == _free_method) {
1643 _methods[i] = m;
1644 return &_methods[i];
1645 }
1646 }
1647 // Only check each block once for frees. They're very unlikely.
1648 // Increment top past the end of the block.
1649 _top++;
1650 }
1651 // need to allocate a next block.
1652 if (_next == NULL) {
1653 _next = new JNIMethodBlock();
1654 }
1655 return _next->add_method(m);
1656 }
1658 bool contains(Method** m) {
1659 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1660 for (int i = 0; i< number_of_methods; i++) {
1661 if (&(b->_methods[i]) == m) {
1662 return true;
1663 }
1664 }
1665 }
1666 return false; // not found
1667 }
1669 // Doesn't really destroy it, just marks it as free so it can be reused.
1670 void destroy_method(Method** m) {
1671 #ifdef ASSERT
1672 assert(contains(m), "should be a methodID");
1673 #endif // ASSERT
1674 *m = _free_method;
1675 }
1677 // During class unloading the methods are cleared, which is different
1678 // than freed.
1679 void clear_all_methods() {
1680 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1681 for (int i = 0; i< number_of_methods; i++) {
1682 _methods[i] = NULL;
1683 }
1684 }
1685 }
1686 #ifndef PRODUCT
1687 int count_methods() {
1688 // count all allocated methods
1689 int count = 0;
1690 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1691 for (int i = 0; i< number_of_methods; i++) {
1692 if (_methods[i] != _free_method) count++;
1693 }
1694 }
1695 return count;
1696 }
1697 #endif // PRODUCT
1698 };
1700 // Something that can't be mistaken for an address or a markOop
1701 Method* const JNIMethodBlock::_free_method = (Method*)55;
1703 // Add a method id to the jmethod_ids
1704 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
1705 ClassLoaderData* cld = loader_data;
1707 if (!SafepointSynchronize::is_at_safepoint()) {
1708 // Have to add jmethod_ids() to class loader data thread-safely.
1709 // Also have to add the method to the list safely, which the cld lock
1710 // protects as well.
1711 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1712 if (cld->jmethod_ids() == NULL) {
1713 cld->set_jmethod_ids(new JNIMethodBlock());
1714 }
1715 // jmethodID is a pointer to Method*
1716 return (jmethodID)cld->jmethod_ids()->add_method(m);
1717 } else {
1718 // At safepoint, we are single threaded and can set this.
1719 if (cld->jmethod_ids() == NULL) {
1720 cld->set_jmethod_ids(new JNIMethodBlock());
1721 }
1722 // jmethodID is a pointer to Method*
1723 return (jmethodID)cld->jmethod_ids()->add_method(m);
1724 }
1725 }
1727 // Mark a jmethodID as free. This is called when there is a data race in
1728 // InstanceKlass while creating the jmethodID cache.
1729 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
1730 ClassLoaderData* cld = loader_data;
1731 Method** ptr = (Method**)m;
1732 assert(cld->jmethod_ids() != NULL, "should have method handles");
1733 cld->jmethod_ids()->destroy_method(ptr);
1734 }
1736 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
1737 // Can't assert the method_holder is the same because the new method has the
1738 // scratch method holder.
1739 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
1740 == new_method->method_holder()->class_loader(),
1741 "changing to a different class loader");
1742 // Just change the method in place, jmethodID pointer doesn't change.
1743 *((Method**)jmid) = new_method;
1744 }
1746 bool Method::is_method_id(jmethodID mid) {
1747 Method* m = resolve_jmethod_id(mid);
1748 assert(m != NULL, "should be called with non-null method");
1749 InstanceKlass* ik = InstanceKlass::cast(m->method_holder());
1750 ClassLoaderData* cld = ik->class_loader_data();
1751 if (cld->jmethod_ids() == NULL) return false;
1752 return (cld->jmethod_ids()->contains((Method**)mid));
1753 }
1755 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
1756 if (mid == NULL) return NULL;
1757 Method* o = resolve_jmethod_id(mid);
1758 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
1759 return NULL;
1760 }
1761 return o;
1762 };
1764 void Method::set_on_stack(const bool value) {
1765 // Set both the method itself and its constant pool. The constant pool
1766 // on stack means some method referring to it is also on the stack.
1767 _access_flags.set_on_stack(value);
1768 constants()->set_on_stack(value);
1769 if (value) MetadataOnStackMark::record(this);
1770 }
1772 // Called when the class loader is unloaded to make all methods weak.
1773 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1774 loader_data->jmethod_ids()->clear_all_methods();
1775 }
1777 #ifndef PRODUCT
1778 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1779 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1780 }
1781 #endif // PRODUCT
1784 // Printing
1786 #ifndef PRODUCT
1788 void Method::print_on(outputStream* st) const {
1789 ResourceMark rm;
1790 assert(is_method(), "must be method");
1791 st->print_cr(internal_name());
1792 // get the effect of PrintOopAddress, always, for methods:
1793 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this);
1794 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
1795 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants());
1796 constants()->print_value_on(st); st->cr();
1797 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
1798 st->print (" - name: "); name()->print_value_on(st); st->cr();
1799 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
1800 st->print_cr(" - max stack: %d", max_stack());
1801 st->print_cr(" - max locals: %d", max_locals());
1802 st->print_cr(" - size of params: %d", size_of_parameters());
1803 st->print_cr(" - method size: %d", method_size());
1804 if (intrinsic_id() != vmIntrinsics::_none)
1805 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
1806 if (highest_comp_level() != CompLevel_none)
1807 st->print_cr(" - highest level: %d", highest_comp_level());
1808 st->print_cr(" - vtable index: %d", _vtable_index);
1809 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
1810 st->print( " - adapters: ");
1811 AdapterHandlerEntry* a = ((Method*)this)->adapter();
1812 if (a == NULL)
1813 st->print_cr(INTPTR_FORMAT, a);
1814 else
1815 a->print_adapter_on(st);
1816 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
1817 st->print_cr(" - code size: %d", code_size());
1818 if (code_size() != 0) {
1819 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
1820 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
1821 }
1822 if (method_data() != NULL) {
1823 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
1824 }
1825 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
1826 if (checked_exceptions_length() > 0) {
1827 CheckedExceptionElement* table = checked_exceptions_start();
1828 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
1829 if (Verbose) {
1830 for (int i = 0; i < checked_exceptions_length(); i++) {
1831 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
1832 }
1833 }
1834 }
1835 if (has_linenumber_table()) {
1836 u_char* table = compressed_linenumber_table();
1837 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
1838 if (Verbose) {
1839 CompressedLineNumberReadStream stream(table);
1840 while (stream.read_pair()) {
1841 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
1842 }
1843 }
1844 }
1845 st->print_cr(" - localvar length: %d", localvariable_table_length());
1846 if (localvariable_table_length() > 0) {
1847 LocalVariableTableElement* table = localvariable_table_start();
1848 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
1849 if (Verbose) {
1850 for (int i = 0; i < localvariable_table_length(); i++) {
1851 int bci = table[i].start_bci;
1852 int len = table[i].length;
1853 const char* name = constants()->printable_name_at(table[i].name_cp_index);
1854 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
1855 int slot = table[i].slot;
1856 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
1857 }
1858 }
1859 }
1860 if (code() != NULL) {
1861 st->print (" - compiled code: ");
1862 code()->print_value_on(st);
1863 }
1864 if (is_native()) {
1865 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
1866 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
1867 }
1868 }
1870 #endif //PRODUCT
1872 void Method::print_value_on(outputStream* st) const {
1873 assert(is_method(), "must be method");
1874 st->print_cr(internal_name());
1875 print_address_on(st);
1876 st->print(" ");
1877 name()->print_value_on(st);
1878 st->print(" ");
1879 signature()->print_value_on(st);
1880 st->print(" in ");
1881 method_holder()->print_value_on(st);
1882 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
1883 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
1884 }
1887 // Verification
1889 void Method::verify_on(outputStream* st) {
1890 guarantee(is_method(), "object must be method");
1891 guarantee(is_metadata(), "should be metadata");
1892 guarantee(constants()->is_constantPool(), "should be constant pool");
1893 guarantee(constants()->is_metadata(), "should be metadata");
1894 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
1895 guarantee(constMethod()->is_metadata(), "should be metadata");
1896 MethodData* md = method_data();
1897 guarantee(md == NULL ||
1898 md->is_metadata(), "should be in permspace");
1899 guarantee(md == NULL ||
1900 md->is_methodData(), "should be method data");
1901 }