Thu, 21 Mar 2013 09:27:54 +0100
7153771: array bound check elimination for c1
Summary: when possible optimize out array bound checks, inserting predicates when needed.
Reviewed-by: never, kvn, twisti
Contributed-by: thomaswue <thomas.wuerthinger@oracle.com>
1 /*
2 * Copyright (c) 1997, 2013, 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/oopFactory.hpp"
40 #include "oops/constMethod.hpp"
41 #include "oops/methodData.hpp"
42 #include "oops/method.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "oops/symbol.hpp"
45 #include "prims/jvmtiExport.hpp"
46 #include "prims/methodHandles.hpp"
47 #include "prims/nativeLookup.hpp"
48 #include "runtime/arguments.hpp"
49 #include "runtime/compilationPolicy.hpp"
50 #include "runtime/frame.inline.hpp"
51 #include "runtime/handles.inline.hpp"
52 #include "runtime/relocator.hpp"
53 #include "runtime/sharedRuntime.hpp"
54 #include "runtime/signature.hpp"
55 #include "utilities/quickSort.hpp"
56 #include "utilities/xmlstream.hpp"
59 // Implementation of Method
61 Method* Method::allocate(ClassLoaderData* loader_data,
62 int byte_code_size,
63 AccessFlags access_flags,
64 InlineTableSizes* sizes,
65 ConstMethod::MethodType method_type,
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 sizes,
72 method_type,
73 CHECK_NULL);
75 int size = Method::size(access_flags.is_native());
77 return new (loader_data, size, false, THREAD) Method(cm, access_flags, size);
78 }
80 Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) {
81 No_Safepoint_Verifier no_safepoint;
82 set_constMethod(xconst);
83 set_access_flags(access_flags);
84 set_method_size(size);
85 #ifdef CC_INTERP
86 set_result_index(T_VOID);
87 #endif
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_method_data(NULL);
94 set_interpreter_throwout_count(0);
95 set_vtable_index(Method::garbage_vtable_index);
97 // Fix and bury in Method*
98 set_interpreter_entry(NULL); // sets i2i entry and from_int
99 set_adapter_entry(NULL);
100 clear_code(); // from_c/from_i get set to c2i/i2i
102 if (access_flags.is_native()) {
103 clear_native_function();
104 set_signature_handler(NULL);
105 }
107 NOT_PRODUCT(set_compiled_invocation_count(0);)
108 set_interpreter_invocation_count(0);
109 invocation_counter()->init();
110 backedge_counter()->init();
111 clear_number_of_breakpoints();
113 #ifdef TIERED
114 set_rate(0);
115 set_prev_event_count(0);
116 set_prev_time(0);
117 #endif
118 }
120 // Release Method*. The nmethod will be gone when we get here because
121 // we've walked the code cache.
122 void Method::deallocate_contents(ClassLoaderData* loader_data) {
123 MetadataFactory::free_metadata(loader_data, constMethod());
124 set_constMethod(NULL);
125 MetadataFactory::free_metadata(loader_data, method_data());
126 set_method_data(NULL);
127 // The nmethod will be gone when we get here.
128 if (code() != NULL) _code = NULL;
129 }
131 address Method::get_i2c_entry() {
132 assert(_adapter != NULL, "must have");
133 return _adapter->get_i2c_entry();
134 }
136 address Method::get_c2i_entry() {
137 assert(_adapter != NULL, "must have");
138 return _adapter->get_c2i_entry();
139 }
141 address Method::get_c2i_unverified_entry() {
142 assert(_adapter != NULL, "must have");
143 return _adapter->get_c2i_unverified_entry();
144 }
146 char* Method::name_and_sig_as_C_string() const {
147 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
148 }
150 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
151 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
152 }
154 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
155 const char* klass_name = klass->external_name();
156 int klass_name_len = (int)strlen(klass_name);
157 int method_name_len = method_name->utf8_length();
158 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
159 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
160 strcpy(dest, klass_name);
161 dest[klass_name_len] = '.';
162 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
163 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
164 dest[len] = 0;
165 return dest;
166 }
168 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
169 Symbol* klass_name = klass->name();
170 klass_name->as_klass_external_name(buf, size);
171 int len = (int)strlen(buf);
173 if (len < size - 1) {
174 buf[len++] = '.';
176 method_name->as_C_string(&(buf[len]), size - len);
177 len = (int)strlen(buf);
179 signature->as_C_string(&(buf[len]), size - len);
180 }
182 return buf;
183 }
185 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) {
186 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
187 // access exception table
188 ExceptionTable table(mh());
189 int length = table.length();
190 // iterate through all entries sequentially
191 constantPoolHandle pool(THREAD, mh->constants());
192 for (int i = 0; i < length; i ++) {
193 //reacquire the table in case a GC happened
194 ExceptionTable table(mh());
195 int beg_bci = table.start_pc(i);
196 int end_bci = table.end_pc(i);
197 assert(beg_bci <= end_bci, "inconsistent exception table");
198 if (beg_bci <= throw_bci && throw_bci < end_bci) {
199 // exception handler bci range covers throw_bci => investigate further
200 int handler_bci = table.handler_pc(i);
201 int klass_index = table.catch_type_index(i);
202 if (klass_index == 0) {
203 return handler_bci;
204 } else if (ex_klass.is_null()) {
205 return handler_bci;
206 } else {
207 // we know the exception class => get the constraint class
208 // this may require loading of the constraint class; if verification
209 // fails or some other exception occurs, return handler_bci
210 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
211 KlassHandle klass = KlassHandle(THREAD, k);
212 assert(klass.not_null(), "klass not loaded");
213 if (ex_klass->is_subtype_of(klass())) {
214 return handler_bci;
215 }
216 }
217 }
218 }
220 return -1;
221 }
223 void Method::mask_for(int bci, InterpreterOopMap* mask) {
225 Thread* myThread = Thread::current();
226 methodHandle h_this(myThread, this);
227 #ifdef ASSERT
228 bool has_capability = myThread->is_VM_thread() ||
229 myThread->is_ConcurrentGC_thread() ||
230 myThread->is_GC_task_thread();
232 if (!has_capability) {
233 if (!VerifyStack && !VerifyLastFrame) {
234 // verify stack calls this outside VM thread
235 warning("oopmap should only be accessed by the "
236 "VM, GC task or CMS threads (or during debugging)");
237 InterpreterOopMap local_mask;
238 method_holder()->mask_for(h_this, bci, &local_mask);
239 local_mask.print();
240 }
241 }
242 #endif
243 method_holder()->mask_for(h_this, bci, mask);
244 return;
245 }
248 int Method::bci_from(address bcp) const {
249 #ifdef ASSERT
250 { ResourceMark rm;
251 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
252 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string()));
253 }
254 #endif
255 return bcp - code_base();
256 }
259 // Return (int)bcx if it appears to be a valid BCI.
260 // Return bci_from((address)bcx) if it appears to be a valid BCP.
261 // Return -1 otherwise.
262 // Used by profiling code, when invalid data is a possibility.
263 // The caller is responsible for validating the Method* itself.
264 int Method::validate_bci_from_bcx(intptr_t bcx) const {
265 // keep bci as -1 if not a valid bci
266 int bci = -1;
267 if (bcx == 0 || (address)bcx == code_base()) {
268 // code_size() may return 0 and we allow 0 here
269 // the method may be native
270 bci = 0;
271 } else if (frame::is_bci(bcx)) {
272 if (bcx < code_size()) {
273 bci = (int)bcx;
274 }
275 } else if (contains((address)bcx)) {
276 bci = (address)bcx - code_base();
277 }
278 // Assert that if we have dodged any asserts, bci is negative.
279 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
280 return bci;
281 }
283 address Method::bcp_from(int bci) const {
284 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci");
285 address bcp = code_base() + bci;
286 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
287 return bcp;
288 }
291 int Method::size(bool is_native) {
292 // If native, then include pointers for native_function and signature_handler
293 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
294 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
295 return align_object_size(header_size() + extra_words);
296 }
299 Symbol* Method::klass_name() const {
300 Klass* k = method_holder();
301 assert(k->is_klass(), "must be klass");
302 InstanceKlass* ik = (InstanceKlass*) k;
303 return ik->name();
304 }
307 // Attempt to return method oop to original state. Clear any pointers
308 // (to objects outside the shared spaces). We won't be able to predict
309 // where they should point in a new JVM. Further initialize some
310 // entries now in order allow them to be write protected later.
312 void Method::remove_unshareable_info() {
313 unlink_method();
314 }
317 bool Method::was_executed_more_than(int n) {
318 // Invocation counter is reset when the Method* is compiled.
319 // If the method has compiled code we therefore assume it has
320 // be excuted more than n times.
321 if (is_accessor() || is_empty_method() || (code() != NULL)) {
322 // interpreter doesn't bump invocation counter of trivial methods
323 // compiler does not bump invocation counter of compiled methods
324 return true;
325 }
326 else if (_invocation_counter.carry() || (method_data() != NULL && method_data()->invocation_counter()->carry())) {
327 // The carry bit is set when the counter overflows and causes
328 // a compilation to occur. We don't know how many times
329 // the counter has been reset, so we simply assume it has
330 // been executed more than n times.
331 return true;
332 } else {
333 return invocation_count() > n;
334 }
335 }
337 #ifndef PRODUCT
338 void Method::print_invocation_count() {
339 if (is_static()) tty->print("static ");
340 if (is_final()) tty->print("final ");
341 if (is_synchronized()) tty->print("synchronized ");
342 if (is_native()) tty->print("native ");
343 method_holder()->name()->print_symbol_on(tty);
344 tty->print(".");
345 name()->print_symbol_on(tty);
346 signature()->print_symbol_on(tty);
348 if (WizardMode) {
349 // dump the size of the byte codes
350 tty->print(" {%d}", code_size());
351 }
352 tty->cr();
354 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
355 tty->print_cr (" invocation_counter: %8d ", invocation_count());
356 tty->print_cr (" backedge_counter: %8d ", backedge_count());
357 if (CountCompiledCalls) {
358 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
359 }
361 }
362 #endif
364 // Build a MethodData* object to hold information about this method
365 // collected in the interpreter.
366 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
367 // Do not profile method if current thread holds the pending list lock,
368 // which avoids deadlock for acquiring the MethodData_lock.
369 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
370 return;
371 }
373 // Grab a lock here to prevent multiple
374 // MethodData*s from being created.
375 MutexLocker ml(MethodData_lock, THREAD);
376 if (method->method_data() == NULL) {
377 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
378 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);
379 method->set_method_data(method_data);
380 if (PrintMethodData && (Verbose || WizardMode)) {
381 ResourceMark rm(THREAD);
382 tty->print("build_interpreter_method_data for ");
383 method->print_name(tty);
384 tty->cr();
385 // At the end of the run, the MDO, full of data, will be dumped.
386 }
387 }
388 }
390 void Method::cleanup_inline_caches() {
391 // The current system doesn't use inline caches in the interpreter
392 // => nothing to do (keep this method around for future use)
393 }
396 int Method::extra_stack_words() {
397 // not an inline function, to avoid a header dependency on Interpreter
398 return extra_stack_entries() * Interpreter::stackElementSize;
399 }
402 void Method::compute_size_of_parameters(Thread *thread) {
403 ArgumentSizeComputer asc(signature());
404 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
405 }
407 #ifdef CC_INTERP
408 void Method::set_result_index(BasicType type) {
409 _result_index = Interpreter::BasicType_as_index(type);
410 }
411 #endif
413 BasicType Method::result_type() const {
414 ResultTypeFinder rtf(signature());
415 return rtf.type();
416 }
419 bool Method::is_empty_method() const {
420 return code_size() == 1
421 && *code_base() == Bytecodes::_return;
422 }
425 bool Method::is_vanilla_constructor() const {
426 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
427 // which only calls the superclass vanilla constructor and possibly does stores of
428 // zero constants to local fields:
429 //
430 // aload_0
431 // invokespecial
432 // indexbyte1
433 // indexbyte2
434 //
435 // followed by an (optional) sequence of:
436 //
437 // aload_0
438 // aconst_null / iconst_0 / fconst_0 / dconst_0
439 // putfield
440 // indexbyte1
441 // indexbyte2
442 //
443 // followed by:
444 //
445 // return
447 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
448 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
449 int size = code_size();
450 // Check if size match
451 if (size == 0 || size % 5 != 0) return false;
452 address cb = code_base();
453 int last = size - 1;
454 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
455 // Does not call superclass default constructor
456 return false;
457 }
458 // Check optional sequence
459 for (int i = 4; i < last; i += 5) {
460 if (cb[i] != Bytecodes::_aload_0) return false;
461 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
462 if (cb[i+2] != Bytecodes::_putfield) return false;
463 }
464 return true;
465 }
468 bool Method::compute_has_loops_flag() {
469 BytecodeStream bcs(this);
470 Bytecodes::Code bc;
472 while ((bc = bcs.next()) >= 0) {
473 switch( bc ) {
474 case Bytecodes::_ifeq:
475 case Bytecodes::_ifnull:
476 case Bytecodes::_iflt:
477 case Bytecodes::_ifle:
478 case Bytecodes::_ifne:
479 case Bytecodes::_ifnonnull:
480 case Bytecodes::_ifgt:
481 case Bytecodes::_ifge:
482 case Bytecodes::_if_icmpeq:
483 case Bytecodes::_if_icmpne:
484 case Bytecodes::_if_icmplt:
485 case Bytecodes::_if_icmpgt:
486 case Bytecodes::_if_icmple:
487 case Bytecodes::_if_icmpge:
488 case Bytecodes::_if_acmpeq:
489 case Bytecodes::_if_acmpne:
490 case Bytecodes::_goto:
491 case Bytecodes::_jsr:
492 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
493 break;
495 case Bytecodes::_goto_w:
496 case Bytecodes::_jsr_w:
497 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
498 break;
499 }
500 }
501 _access_flags.set_loops_flag_init();
502 return _access_flags.has_loops();
503 }
506 bool Method::is_final_method() const {
507 // %%% Should return true for private methods also,
508 // since there is no way to override them.
509 return is_final() || method_holder()->is_final();
510 }
513 bool Method::is_strict_method() const {
514 return is_strict();
515 }
518 bool Method::can_be_statically_bound() const {
519 if (is_final_method()) return true;
520 return vtable_index() == nonvirtual_vtable_index;
521 }
524 bool Method::is_accessor() const {
525 if (code_size() != 5) return false;
526 if (size_of_parameters() != 1) return false;
527 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
528 if (java_code_at(1) != Bytecodes::_getfield) return false;
529 if (java_code_at(4) != Bytecodes::_areturn &&
530 java_code_at(4) != Bytecodes::_ireturn ) return false;
531 return true;
532 }
535 bool Method::is_initializer() const {
536 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
537 }
539 bool Method::has_valid_initializer_flags() const {
540 return (is_static() ||
541 method_holder()->major_version() < 51);
542 }
544 bool Method::is_static_initializer() const {
545 // For classfiles version 51 or greater, ensure that the clinit method is
546 // static. Non-static methods with the name "<clinit>" are not static
547 // initializers. (older classfiles exempted for backward compatibility)
548 return name() == vmSymbols::class_initializer_name() &&
549 has_valid_initializer_flags();
550 }
553 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) {
554 int length = this_oop->checked_exceptions_length();
555 if (length == 0) { // common case
556 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
557 } else {
558 methodHandle h_this(THREAD, this_oop);
559 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
560 objArrayHandle mirrors (THREAD, m_oop);
561 for (int i = 0; i < length; i++) {
562 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
563 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
564 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
565 mirrors->obj_at_put(i, k->java_mirror());
566 }
567 return mirrors;
568 }
569 };
572 int Method::line_number_from_bci(int bci) const {
573 if (bci == SynchronizationEntryBCI) bci = 0;
574 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
575 int best_bci = 0;
576 int best_line = -1;
578 if (has_linenumber_table()) {
579 // The line numbers are a short array of 2-tuples [start_pc, line_number].
580 // Not necessarily sorted and not necessarily one-to-one.
581 CompressedLineNumberReadStream stream(compressed_linenumber_table());
582 while (stream.read_pair()) {
583 if (stream.bci() == bci) {
584 // perfect match
585 return stream.line();
586 } else {
587 // update best_bci/line
588 if (stream.bci() < bci && stream.bci() >= best_bci) {
589 best_bci = stream.bci();
590 best_line = stream.line();
591 }
592 }
593 }
594 }
595 return best_line;
596 }
599 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
600 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
601 Thread *thread = Thread::current();
602 Symbol* klass_name = constants()->klass_name_at(klass_index);
603 Handle loader(thread, method_holder()->class_loader());
604 Handle prot (thread, method_holder()->protection_domain());
605 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
606 } else {
607 return true;
608 }
609 }
612 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
613 int klass_index = constants()->klass_ref_index_at(refinfo_index);
614 if (must_be_resolved) {
615 // Make sure klass is resolved in constantpool.
616 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
617 }
618 return is_klass_loaded_by_klass_index(klass_index);
619 }
622 void Method::set_native_function(address function, bool post_event_flag) {
623 assert(function != NULL, "use clear_native_function to unregister natives");
624 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
625 address* native_function = native_function_addr();
627 // We can see racers trying to place the same native function into place. Once
628 // is plenty.
629 address current = *native_function;
630 if (current == function) return;
631 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
632 function != NULL) {
633 // native_method_throw_unsatisfied_link_error_entry() should only
634 // be passed when post_event_flag is false.
635 assert(function !=
636 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
637 "post_event_flag mis-match");
639 // post the bind event, and possible change the bind function
640 JvmtiExport::post_native_method_bind(this, &function);
641 }
642 *native_function = function;
643 // This function can be called more than once. We must make sure that we always
644 // use the latest registered method -> check if a stub already has been generated.
645 // If so, we have to make it not_entrant.
646 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
647 if (nm != NULL) {
648 nm->make_not_entrant();
649 }
650 }
653 bool Method::has_native_function() const {
654 if (is_method_handle_intrinsic())
655 return false; // special-cased in SharedRuntime::generate_native_wrapper
656 address func = native_function();
657 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
658 }
661 void Method::clear_native_function() {
662 // Note: is_method_handle_intrinsic() is allowed here.
663 set_native_function(
664 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
665 !native_bind_event_is_interesting);
666 clear_code();
667 }
669 address Method::critical_native_function() {
670 methodHandle mh(this);
671 return NativeLookup::lookup_critical_entry(mh);
672 }
675 void Method::set_signature_handler(address handler) {
676 address* signature_handler = signature_handler_addr();
677 *signature_handler = handler;
678 }
681 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
682 if (PrintCompilation && report) {
683 ttyLocker ttyl;
684 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
685 if (comp_level == CompLevel_all) {
686 tty->print("all levels ");
687 } else {
688 tty->print("levels ");
689 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
690 tty->print("%d ", i);
691 }
692 }
693 this->print_short_name(tty);
694 int size = this->code_size();
695 if (size > 0) {
696 tty->print(" (%d bytes)", size);
697 }
698 if (reason != NULL) {
699 tty->print(" %s", reason);
700 }
701 tty->cr();
702 }
703 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
704 ttyLocker ttyl;
705 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'",
706 is_osr ? "osr_" : "", os::current_thread_id());
707 if (reason != NULL) {
708 xtty->print(" reason=\'%s\'", reason);
709 }
710 xtty->method(this);
711 xtty->stamp();
712 xtty->end_elem();
713 }
714 }
716 bool Method::is_not_compilable(int comp_level) const {
717 if (number_of_breakpoints() > 0)
718 return true;
719 if (is_method_handle_intrinsic())
720 return !is_synthetic(); // the generated adapters must be compiled
721 if (comp_level == CompLevel_any)
722 return is_not_c1_compilable() || is_not_c2_compilable();
723 if (is_c1_compile(comp_level))
724 return is_not_c1_compilable();
725 if (is_c2_compile(comp_level))
726 return is_not_c2_compilable();
727 return false;
728 }
730 // call this when compiler finds that this method is not compilable
731 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
732 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
733 if (comp_level == CompLevel_all) {
734 set_not_c1_compilable();
735 set_not_c2_compilable();
736 } else {
737 if (is_c1_compile(comp_level))
738 set_not_c1_compilable();
739 if (is_c2_compile(comp_level))
740 set_not_c2_compilable();
741 }
742 CompilationPolicy::policy()->disable_compilation(this);
743 }
745 bool Method::is_not_osr_compilable(int comp_level) const {
746 if (is_not_compilable(comp_level))
747 return true;
748 if (comp_level == CompLevel_any)
749 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
750 if (is_c1_compile(comp_level))
751 return is_not_c1_osr_compilable();
752 if (is_c2_compile(comp_level))
753 return is_not_c2_osr_compilable();
754 return false;
755 }
757 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
758 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
759 if (comp_level == CompLevel_all) {
760 set_not_c1_osr_compilable();
761 set_not_c2_osr_compilable();
762 } else {
763 if (is_c1_compile(comp_level))
764 set_not_c1_osr_compilable();
765 if (is_c2_compile(comp_level))
766 set_not_c2_osr_compilable();
767 }
768 CompilationPolicy::policy()->disable_compilation(this);
769 }
771 // Revert to using the interpreter and clear out the nmethod
772 void Method::clear_code() {
774 // this may be NULL if c2i adapters have not been made yet
775 // Only should happen at allocate time.
776 if (_adapter == NULL) {
777 _from_compiled_entry = NULL;
778 } else {
779 _from_compiled_entry = _adapter->get_c2i_entry();
780 }
781 OrderAccess::storestore();
782 _from_interpreted_entry = _i2i_entry;
783 OrderAccess::storestore();
784 _code = NULL;
785 }
787 // Called by class data sharing to remove any entry points (which are not shared)
788 void Method::unlink_method() {
789 _code = NULL;
790 _i2i_entry = NULL;
791 _from_interpreted_entry = NULL;
792 if (is_native()) {
793 *native_function_addr() = NULL;
794 set_signature_handler(NULL);
795 }
796 NOT_PRODUCT(set_compiled_invocation_count(0);)
797 invocation_counter()->reset();
798 backedge_counter()->reset();
799 _adapter = NULL;
800 _from_compiled_entry = NULL;
801 assert(_method_data == NULL, "unexpected method data?");
802 set_method_data(NULL);
803 set_interpreter_throwout_count(0);
804 set_interpreter_invocation_count(0);
805 }
807 // Called when the method_holder is getting linked. Setup entrypoints so the method
808 // is ready to be called from interpreter, compiler, and vtables.
809 void Method::link_method(methodHandle h_method, TRAPS) {
810 // If the code cache is full, we may reenter this function for the
811 // leftover methods that weren't linked.
812 if (_i2i_entry != NULL) return;
814 assert(_adapter == NULL, "init'd to NULL" );
815 assert( _code == NULL, "nothing compiled yet" );
817 // Setup interpreter entrypoint
818 assert(this == h_method(), "wrong h_method()" );
819 address entry = Interpreter::entry_for_method(h_method);
820 assert(entry != NULL, "interpreter entry must be non-null");
821 // Sets both _i2i_entry and _from_interpreted_entry
822 set_interpreter_entry(entry);
823 if (is_native() && !is_method_handle_intrinsic()) {
824 set_native_function(
825 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
826 !native_bind_event_is_interesting);
827 }
829 // Setup compiler entrypoint. This is made eagerly, so we do not need
830 // special handling of vtables. An alternative is to make adapters more
831 // lazily by calling make_adapter() from from_compiled_entry() for the
832 // normal calls. For vtable calls life gets more complicated. When a
833 // call-site goes mega-morphic we need adapters in all methods which can be
834 // called from the vtable. We need adapters on such methods that get loaded
835 // later. Ditto for mega-morphic itable calls. If this proves to be a
836 // problem we'll make these lazily later.
837 (void) make_adapters(h_method, CHECK);
839 // ONLY USE the h_method now as make_adapter may have blocked
841 }
843 address Method::make_adapters(methodHandle mh, TRAPS) {
844 // Adapters for compiled code are made eagerly here. They are fairly
845 // small (generally < 100 bytes) and quick to make (and cached and shared)
846 // so making them eagerly shouldn't be too expensive.
847 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
848 if (adapter == NULL ) {
849 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
850 }
852 mh->set_adapter_entry(adapter);
853 mh->_from_compiled_entry = adapter->get_c2i_entry();
854 return adapter->get_c2i_entry();
855 }
857 // The verified_code_entry() must be called when a invoke is resolved
858 // on this method.
860 // It returns the compiled code entry point, after asserting not null.
861 // This function is called after potential safepoints so that nmethod
862 // or adapter that it points to is still live and valid.
863 // This function must not hit a safepoint!
864 address Method::verified_code_entry() {
865 debug_only(No_Safepoint_Verifier nsv;)
866 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
867 if (code == NULL && UseCodeCacheFlushing) {
868 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this);
869 if (saved_code != NULL) {
870 methodHandle method(this);
871 assert( ! saved_code->is_osr_method(), "should not get here for osr" );
872 set_code( method, saved_code );
873 }
874 }
876 assert(_from_compiled_entry != NULL, "must be set");
877 return _from_compiled_entry;
878 }
880 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
881 // (could be racing a deopt).
882 // Not inline to avoid circular ref.
883 bool Method::check_code() const {
884 // cached in a register or local. There's a race on the value of the field.
885 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
886 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
887 }
889 // Install compiled code. Instantly it can execute.
890 void Method::set_code(methodHandle mh, nmethod *code) {
891 assert( code, "use clear_code to remove code" );
892 assert( mh->check_code(), "" );
894 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
896 // These writes must happen in this order, because the interpreter will
897 // directly jump to from_interpreted_entry which jumps to an i2c adapter
898 // which jumps to _from_compiled_entry.
899 mh->_code = code; // Assign before allowing compiled code to exec
901 int comp_level = code->comp_level();
902 // In theory there could be a race here. In practice it is unlikely
903 // and not worth worrying about.
904 if (comp_level > mh->highest_comp_level()) {
905 mh->set_highest_comp_level(comp_level);
906 }
908 OrderAccess::storestore();
909 #ifdef SHARK
910 mh->_from_interpreted_entry = code->insts_begin();
911 #else //!SHARK
912 mh->_from_compiled_entry = code->verified_entry_point();
913 OrderAccess::storestore();
914 // Instantly compiled code can execute.
915 if (!mh->is_method_handle_intrinsic())
916 mh->_from_interpreted_entry = mh->get_i2c_entry();
917 #endif //!SHARK
918 }
921 bool Method::is_overridden_in(Klass* k) const {
922 InstanceKlass* ik = InstanceKlass::cast(k);
924 if (ik->is_interface()) return false;
926 // If method is an interface, we skip it - except if it
927 // is a miranda method
928 if (method_holder()->is_interface()) {
929 // Check that method is not a miranda method
930 if (ik->lookup_method(name(), signature()) == NULL) {
931 // No implementation exist - so miranda method
932 return false;
933 }
934 return true;
935 }
937 assert(ik->is_subclass_of(method_holder()), "should be subklass");
938 assert(ik->vtable() != NULL, "vtable should exist");
939 if (vtable_index() == nonvirtual_vtable_index) {
940 return false;
941 } else {
942 Method* vt_m = ik->method_at_vtable(vtable_index());
943 return vt_m != this;
944 }
945 }
948 // give advice about whether this Method* should be cached or not
949 bool Method::should_not_be_cached() const {
950 if (is_old()) {
951 // This method has been redefined. It is either EMCP or obsolete
952 // and we don't want to cache it because that would pin the method
953 // down and prevent it from being collectible if and when it
954 // finishes executing.
955 return true;
956 }
958 // caching this method should be just fine
959 return false;
960 }
962 // Constant pool structure for invoke methods:
963 enum {
964 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
965 _imcp_invoke_signature, // utf8: (variable Symbol*)
966 _imcp_limit
967 };
969 // Test if this method is an MH adapter frame generated by Java code.
970 // Cf. java/lang/invoke/InvokerBytecodeGenerator
971 bool Method::is_compiled_lambda_form() const {
972 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
973 }
975 // Test if this method is an internal MH primitive method.
976 bool Method::is_method_handle_intrinsic() const {
977 vmIntrinsics::ID iid = intrinsic_id();
978 return (MethodHandles::is_signature_polymorphic(iid) &&
979 MethodHandles::is_signature_polymorphic_intrinsic(iid));
980 }
982 bool Method::has_member_arg() const {
983 vmIntrinsics::ID iid = intrinsic_id();
984 return (MethodHandles::is_signature_polymorphic(iid) &&
985 MethodHandles::has_member_arg(iid));
986 }
988 // Make an instance of a signature-polymorphic internal MH primitive.
989 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
990 Symbol* signature,
991 TRAPS) {
992 ResourceMark rm;
993 methodHandle empty;
995 KlassHandle holder = SystemDictionary::MethodHandle_klass();
996 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
997 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
998 if (TraceMethodHandles) {
999 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1000 }
1002 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1003 name->increment_refcount();
1004 signature->increment_refcount();
1006 int cp_length = _imcp_limit;
1007 ClassLoaderData* loader_data = holder->class_loader_data();
1008 constantPoolHandle cp;
1009 {
1010 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1011 cp = constantPoolHandle(THREAD, cp_oop);
1012 }
1013 cp->set_pool_holder(InstanceKlass::cast(holder()));
1014 cp->symbol_at_put(_imcp_invoke_name, name);
1015 cp->symbol_at_put(_imcp_invoke_signature, signature);
1016 cp->set_has_preresolution();
1018 // decide on access bits: public or not?
1019 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1020 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1021 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1022 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1024 methodHandle m;
1025 {
1026 InlineTableSizes sizes;
1027 Method* m_oop = Method::allocate(loader_data, 0,
1028 accessFlags_from(flags_bits), &sizes,
1029 ConstMethod::NORMAL, CHECK_(empty));
1030 m = methodHandle(THREAD, m_oop);
1031 }
1032 m->set_constants(cp());
1033 m->set_name_index(_imcp_invoke_name);
1034 m->set_signature_index(_imcp_invoke_signature);
1035 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1036 assert(m->signature() == signature, "");
1037 #ifdef CC_INTERP
1038 ResultTypeFinder rtf(signature);
1039 m->set_result_index(rtf.type());
1040 #endif
1041 m->compute_size_of_parameters(THREAD);
1042 m->init_intrinsic_id();
1043 assert(m->is_method_handle_intrinsic(), "");
1044 #ifdef ASSERT
1045 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1046 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1047 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1048 #endif //ASSERT
1050 // Finally, set up its entry points.
1051 assert(m->can_be_statically_bound(), "");
1052 m->set_vtable_index(Method::nonvirtual_vtable_index);
1053 m->link_method(m, CHECK_(empty));
1055 if (TraceMethodHandles && (Verbose || WizardMode))
1056 m->print_on(tty);
1058 return m;
1059 }
1061 Klass* Method::check_non_bcp_klass(Klass* klass) {
1062 if (klass != NULL && klass->class_loader() != NULL) {
1063 if (klass->oop_is_objArray())
1064 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1065 return klass;
1066 }
1067 return NULL;
1068 }
1071 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1072 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1073 // Code below does not work for native methods - they should never get rewritten anyway
1074 assert(!m->is_native(), "cannot rewrite native methods");
1075 // Allocate new Method*
1076 AccessFlags flags = m->access_flags();
1078 ConstMethod* cm = m->constMethod();
1079 int checked_exceptions_len = cm->checked_exceptions_length();
1080 int localvariable_len = cm->localvariable_table_length();
1081 int exception_table_len = cm->exception_table_length();
1082 int method_parameters_len = cm->method_parameters_length();
1083 int method_annotations_len = cm->method_annotations_length();
1084 int parameter_annotations_len = cm->parameter_annotations_length();
1085 int type_annotations_len = cm->type_annotations_length();
1086 int default_annotations_len = cm->default_annotations_length();
1088 InlineTableSizes sizes(
1089 localvariable_len,
1090 new_compressed_linenumber_size,
1091 exception_table_len,
1092 checked_exceptions_len,
1093 method_parameters_len,
1094 cm->generic_signature_index(),
1095 method_annotations_len,
1096 parameter_annotations_len,
1097 type_annotations_len,
1098 default_annotations_len,
1099 0);
1101 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1102 Method* newm_oop = Method::allocate(loader_data,
1103 new_code_length,
1104 flags,
1105 &sizes,
1106 m->method_type(),
1107 CHECK_(methodHandle()));
1108 methodHandle newm (THREAD, newm_oop);
1109 int new_method_size = newm->method_size();
1111 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1112 ConstMethod* newcm = newm->constMethod();
1113 int new_const_method_size = newm->constMethod()->size();
1115 memcpy(newm(), m(), sizeof(Method));
1117 // Create shallow copy of ConstMethod.
1118 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1120 // Reset correct method/const method, method size, and parameter info
1121 newm->set_constMethod(newcm);
1122 newm->constMethod()->set_code_size(new_code_length);
1123 newm->constMethod()->set_constMethod_size(new_const_method_size);
1124 newm->set_method_size(new_method_size);
1125 assert(newm->code_size() == new_code_length, "check");
1126 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1127 assert(newm->exception_table_length() == exception_table_len, "check");
1128 assert(newm->localvariable_table_length() == localvariable_len, "check");
1129 // Copy new byte codes
1130 memcpy(newm->code_base(), new_code, new_code_length);
1131 // Copy line number table
1132 if (new_compressed_linenumber_size > 0) {
1133 memcpy(newm->compressed_linenumber_table(),
1134 new_compressed_linenumber_table,
1135 new_compressed_linenumber_size);
1136 }
1137 // Copy checked_exceptions
1138 if (checked_exceptions_len > 0) {
1139 memcpy(newm->checked_exceptions_start(),
1140 m->checked_exceptions_start(),
1141 checked_exceptions_len * sizeof(CheckedExceptionElement));
1142 }
1143 // Copy exception table
1144 if (exception_table_len > 0) {
1145 memcpy(newm->exception_table_start(),
1146 m->exception_table_start(),
1147 exception_table_len * sizeof(ExceptionTableElement));
1148 }
1149 // Copy local variable number table
1150 if (localvariable_len > 0) {
1151 memcpy(newm->localvariable_table_start(),
1152 m->localvariable_table_start(),
1153 localvariable_len * sizeof(LocalVariableTableElement));
1154 }
1155 // Copy stackmap table
1156 if (m->has_stackmap_table()) {
1157 int code_attribute_length = m->stackmap_data()->length();
1158 Array<u1>* stackmap_data =
1159 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1160 memcpy((void*)stackmap_data->adr_at(0),
1161 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1162 newm->set_stackmap_data(stackmap_data);
1163 }
1165 return newm;
1166 }
1168 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1169 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1170 // because we are not loading from core libraries
1171 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1172 // which does not use the class default class loader so we check for its loader here
1173 if ((InstanceKlass::cast(holder)->class_loader() != NULL) &&
1174 InstanceKlass::cast(holder)->class_loader()->klass()->name() != vmSymbols::sun_misc_Launcher_ExtClassLoader()) {
1175 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1176 }
1178 // see if the klass name is well-known:
1179 Symbol* klass_name = InstanceKlass::cast(holder)->name();
1180 return vmSymbols::find_sid(klass_name);
1181 }
1183 void Method::init_intrinsic_id() {
1184 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1185 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1186 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1187 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1189 // the klass name is well-known:
1190 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1191 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1193 // ditto for method and signature:
1194 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1195 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1196 && name_id == vmSymbols::NO_SID)
1197 return;
1198 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1199 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1200 && sig_id == vmSymbols::NO_SID) return;
1201 jshort flags = access_flags().as_short();
1203 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1204 if (id != vmIntrinsics::_none) {
1205 set_intrinsic_id(id);
1206 return;
1207 }
1209 // A few slightly irregular cases:
1210 switch (klass_id) {
1211 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1212 // Second chance: check in regular Math.
1213 switch (name_id) {
1214 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1215 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1216 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1217 // pretend it is the corresponding method in the non-strict class:
1218 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1219 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1220 break;
1221 }
1222 break;
1224 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1225 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1226 if (!is_native()) break;
1227 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1228 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1229 id = vmIntrinsics::_none;
1230 break;
1231 }
1233 if (id != vmIntrinsics::_none) {
1234 // Set up its iid. It is an alias method.
1235 set_intrinsic_id(id);
1236 return;
1237 }
1238 }
1240 // These two methods are static since a GC may move the Method
1241 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1242 if (THREAD->is_Compiler_thread()) {
1243 // There is nothing useful this routine can do from within the Compile thread.
1244 // Hopefully, the signature contains only well-known classes.
1245 // We could scan for this and return true/false, but the caller won't care.
1246 return false;
1247 }
1248 bool sig_is_loaded = true;
1249 Handle class_loader(THREAD, m->method_holder()->class_loader());
1250 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1251 ResourceMark rm(THREAD);
1252 Symbol* signature = m->signature();
1253 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1254 if (ss.is_object()) {
1255 Symbol* sym = ss.as_symbol(CHECK_(false));
1256 Symbol* name = sym;
1257 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1258 protection_domain, THREAD);
1259 // We are loading classes eagerly. If a ClassNotFoundException or
1260 // a LinkageError was generated, be sure to ignore it.
1261 if (HAS_PENDING_EXCEPTION) {
1262 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1263 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1264 CLEAR_PENDING_EXCEPTION;
1265 } else {
1266 return false;
1267 }
1268 }
1269 if( klass == NULL) { sig_is_loaded = false; }
1270 }
1271 }
1272 return sig_is_loaded;
1273 }
1275 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1276 Handle class_loader(THREAD, m->method_holder()->class_loader());
1277 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1278 ResourceMark rm(THREAD);
1279 Symbol* signature = m->signature();
1280 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1281 if (ss.type() == T_OBJECT) {
1282 Symbol* name = ss.as_symbol_or_null();
1283 if (name == NULL) return true;
1284 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1285 if (klass == NULL) return true;
1286 }
1287 }
1288 return false;
1289 }
1291 // Exposed so field engineers can debug VM
1292 void Method::print_short_name(outputStream* st) {
1293 ResourceMark rm;
1294 #ifdef PRODUCT
1295 st->print(" %s::", method_holder()->external_name());
1296 #else
1297 st->print(" %s::", method_holder()->internal_name());
1298 #endif
1299 name()->print_symbol_on(st);
1300 if (WizardMode) signature()->print_symbol_on(st);
1301 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1302 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1303 }
1305 // Comparer for sorting an object array containing
1306 // Method*s.
1307 static int method_comparator(Method* a, Method* b) {
1308 return a->name()->fast_compare(b->name());
1309 }
1311 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1312 void Method::sort_methods(Array<Method*>* methods, bool idempotent) {
1313 int length = methods->length();
1314 if (length > 1) {
1315 {
1316 No_Safepoint_Verifier nsv;
1317 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1318 }
1319 // Reset method ordering
1320 for (int i = 0; i < length; i++) {
1321 Method* m = methods->at(i);
1322 m->set_method_idnum(i);
1323 }
1324 }
1325 }
1328 //-----------------------------------------------------------------------------------
1329 // Non-product code unless JVM/TI needs it
1331 #if !defined(PRODUCT) || INCLUDE_JVMTI
1332 class SignatureTypePrinter : public SignatureTypeNames {
1333 private:
1334 outputStream* _st;
1335 bool _use_separator;
1337 void type_name(const char* name) {
1338 if (_use_separator) _st->print(", ");
1339 _st->print(name);
1340 _use_separator = true;
1341 }
1343 public:
1344 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1345 _st = st;
1346 _use_separator = false;
1347 }
1349 void print_parameters() { _use_separator = false; iterate_parameters(); }
1350 void print_returntype() { _use_separator = false; iterate_returntype(); }
1351 };
1354 void Method::print_name(outputStream* st) {
1355 Thread *thread = Thread::current();
1356 ResourceMark rm(thread);
1357 SignatureTypePrinter sig(signature(), st);
1358 st->print("%s ", is_static() ? "static" : "virtual");
1359 sig.print_returntype();
1360 st->print(" %s.", method_holder()->internal_name());
1361 name()->print_symbol_on(st);
1362 st->print("(");
1363 sig.print_parameters();
1364 st->print(")");
1365 }
1366 #endif // !PRODUCT || INCLUDE_JVMTI
1369 //-----------------------------------------------------------------------------------
1370 // Non-product code
1372 #ifndef PRODUCT
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 = 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 = 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 = 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 = 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 = 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 }
1778 // Check that this pointer is valid by checking that the vtbl pointer matches
1779 bool Method::is_valid_method() const {
1780 if (this == NULL) {
1781 return false;
1782 } else if (!is_metaspace_object()) {
1783 return false;
1784 } else {
1785 Method m;
1786 // This assumes that the vtbl pointer is the first word of a C++ object.
1787 // This assumption is also in universe.cpp patch_klass_vtble
1788 void* vtbl2 = dereference_vptr((void*)&m);
1789 void* this_vtbl = dereference_vptr((void*)this);
1790 return vtbl2 == this_vtbl;
1791 }
1792 }
1794 #ifndef PRODUCT
1795 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1796 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1797 }
1798 #endif // PRODUCT
1801 // Printing
1803 #ifndef PRODUCT
1805 void Method::print_on(outputStream* st) const {
1806 ResourceMark rm;
1807 assert(is_method(), "must be method");
1808 st->print_cr(internal_name());
1809 // get the effect of PrintOopAddress, always, for methods:
1810 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this);
1811 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
1812 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants());
1813 constants()->print_value_on(st); st->cr();
1814 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
1815 st->print (" - name: "); name()->print_value_on(st); st->cr();
1816 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
1817 st->print_cr(" - max stack: %d", max_stack());
1818 st->print_cr(" - max locals: %d", max_locals());
1819 st->print_cr(" - size of params: %d", size_of_parameters());
1820 st->print_cr(" - method size: %d", method_size());
1821 if (intrinsic_id() != vmIntrinsics::_none)
1822 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
1823 if (highest_comp_level() != CompLevel_none)
1824 st->print_cr(" - highest level: %d", highest_comp_level());
1825 st->print_cr(" - vtable index: %d", _vtable_index);
1826 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
1827 st->print( " - adapters: ");
1828 AdapterHandlerEntry* a = ((Method*)this)->adapter();
1829 if (a == NULL)
1830 st->print_cr(INTPTR_FORMAT, a);
1831 else
1832 a->print_adapter_on(st);
1833 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
1834 st->print_cr(" - code size: %d", code_size());
1835 if (code_size() != 0) {
1836 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
1837 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
1838 }
1839 if (method_data() != NULL) {
1840 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
1841 }
1842 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
1843 if (checked_exceptions_length() > 0) {
1844 CheckedExceptionElement* table = checked_exceptions_start();
1845 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
1846 if (Verbose) {
1847 for (int i = 0; i < checked_exceptions_length(); i++) {
1848 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
1849 }
1850 }
1851 }
1852 if (has_linenumber_table()) {
1853 u_char* table = compressed_linenumber_table();
1854 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
1855 if (Verbose) {
1856 CompressedLineNumberReadStream stream(table);
1857 while (stream.read_pair()) {
1858 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
1859 }
1860 }
1861 }
1862 st->print_cr(" - localvar length: %d", localvariable_table_length());
1863 if (localvariable_table_length() > 0) {
1864 LocalVariableTableElement* table = localvariable_table_start();
1865 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
1866 if (Verbose) {
1867 for (int i = 0; i < localvariable_table_length(); i++) {
1868 int bci = table[i].start_bci;
1869 int len = table[i].length;
1870 const char* name = constants()->printable_name_at(table[i].name_cp_index);
1871 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
1872 int slot = table[i].slot;
1873 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
1874 }
1875 }
1876 }
1877 if (code() != NULL) {
1878 st->print (" - compiled code: ");
1879 code()->print_value_on(st);
1880 }
1881 if (is_native()) {
1882 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
1883 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
1884 }
1885 }
1887 #endif //PRODUCT
1889 void Method::print_value_on(outputStream* st) const {
1890 assert(is_method(), "must be method");
1891 st->print_cr(internal_name());
1892 print_address_on(st);
1893 st->print(" ");
1894 name()->print_value_on(st);
1895 st->print(" ");
1896 signature()->print_value_on(st);
1897 st->print(" in ");
1898 method_holder()->print_value_on(st);
1899 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
1900 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
1901 }
1903 #if INCLUDE_SERVICES
1904 // Size Statistics
1905 void Method::collect_statistics(KlassSizeStats *sz) const {
1906 int mysize = sz->count(this);
1907 sz->_method_bytes += mysize;
1908 sz->_method_all_bytes += mysize;
1909 sz->_rw_bytes += mysize;
1911 if (constMethod()) {
1912 constMethod()->collect_statistics(sz);
1913 }
1914 if (method_data()) {
1915 method_data()->collect_statistics(sz);
1916 }
1917 }
1918 #endif // INCLUDE_SERVICES
1920 // Verification
1922 void Method::verify_on(outputStream* st) {
1923 guarantee(is_method(), "object must be method");
1924 guarantee(is_metadata(), "should be metadata");
1925 guarantee(constants()->is_constantPool(), "should be constant pool");
1926 guarantee(constants()->is_metadata(), "should be metadata");
1927 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
1928 guarantee(constMethod()->is_metadata(), "should be metadata");
1929 MethodData* md = method_data();
1930 guarantee(md == NULL ||
1931 md->is_metadata(), "should be metadata");
1932 guarantee(md == NULL ||
1933 md->is_methodData(), "should be method data");
1934 }