Fri, 13 Sep 2013 22:38:02 -0400
8014013: CallInfo structure no longer accurately reports the result of a LinkResolver operation
Summary: Enhance method resolution and resulting data structures, plus some refactoring.
Reviewed-by: twisti, acorn, jrose
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, MetaspaceObj::MethodType, 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_method_counters(NULL);
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 }
110 // Release Method*. The nmethod will be gone when we get here because
111 // we've walked the code cache.
112 void Method::deallocate_contents(ClassLoaderData* loader_data) {
113 MetadataFactory::free_metadata(loader_data, constMethod());
114 set_constMethod(NULL);
115 MetadataFactory::free_metadata(loader_data, method_data());
116 set_method_data(NULL);
117 MetadataFactory::free_metadata(loader_data, method_counters());
118 set_method_counters(NULL);
119 // The nmethod will be gone when we get here.
120 if (code() != NULL) _code = NULL;
121 }
123 address Method::get_i2c_entry() {
124 assert(_adapter != NULL, "must have");
125 return _adapter->get_i2c_entry();
126 }
128 address Method::get_c2i_entry() {
129 assert(_adapter != NULL, "must have");
130 return _adapter->get_c2i_entry();
131 }
133 address Method::get_c2i_unverified_entry() {
134 assert(_adapter != NULL, "must have");
135 return _adapter->get_c2i_unverified_entry();
136 }
138 char* Method::name_and_sig_as_C_string() const {
139 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
140 }
142 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
143 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
144 }
146 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
147 const char* klass_name = klass->external_name();
148 int klass_name_len = (int)strlen(klass_name);
149 int method_name_len = method_name->utf8_length();
150 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
151 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
152 strcpy(dest, klass_name);
153 dest[klass_name_len] = '.';
154 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
155 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
156 dest[len] = 0;
157 return dest;
158 }
160 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
161 Symbol* klass_name = klass->name();
162 klass_name->as_klass_external_name(buf, size);
163 int len = (int)strlen(buf);
165 if (len < size - 1) {
166 buf[len++] = '.';
168 method_name->as_C_string(&(buf[len]), size - len);
169 len = (int)strlen(buf);
171 signature->as_C_string(&(buf[len]), size - len);
172 }
174 return buf;
175 }
177 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) {
178 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
179 // access exception table
180 ExceptionTable table(mh());
181 int length = table.length();
182 // iterate through all entries sequentially
183 constantPoolHandle pool(THREAD, mh->constants());
184 for (int i = 0; i < length; i ++) {
185 //reacquire the table in case a GC happened
186 ExceptionTable table(mh());
187 int beg_bci = table.start_pc(i);
188 int end_bci = table.end_pc(i);
189 assert(beg_bci <= end_bci, "inconsistent exception table");
190 if (beg_bci <= throw_bci && throw_bci < end_bci) {
191 // exception handler bci range covers throw_bci => investigate further
192 int handler_bci = table.handler_pc(i);
193 int klass_index = table.catch_type_index(i);
194 if (klass_index == 0) {
195 return handler_bci;
196 } else if (ex_klass.is_null()) {
197 return handler_bci;
198 } else {
199 // we know the exception class => get the constraint class
200 // this may require loading of the constraint class; if verification
201 // fails or some other exception occurs, return handler_bci
202 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
203 KlassHandle klass = KlassHandle(THREAD, k);
204 assert(klass.not_null(), "klass not loaded");
205 if (ex_klass->is_subtype_of(klass())) {
206 return handler_bci;
207 }
208 }
209 }
210 }
212 return -1;
213 }
215 void Method::mask_for(int bci, InterpreterOopMap* mask) {
217 Thread* myThread = Thread::current();
218 methodHandle h_this(myThread, this);
219 #ifdef ASSERT
220 bool has_capability = myThread->is_VM_thread() ||
221 myThread->is_ConcurrentGC_thread() ||
222 myThread->is_GC_task_thread();
224 if (!has_capability) {
225 if (!VerifyStack && !VerifyLastFrame) {
226 // verify stack calls this outside VM thread
227 warning("oopmap should only be accessed by the "
228 "VM, GC task or CMS threads (or during debugging)");
229 InterpreterOopMap local_mask;
230 method_holder()->mask_for(h_this, bci, &local_mask);
231 local_mask.print();
232 }
233 }
234 #endif
235 method_holder()->mask_for(h_this, bci, mask);
236 return;
237 }
240 int Method::bci_from(address bcp) const {
241 #ifdef ASSERT
242 { ResourceMark rm;
243 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
244 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string()));
245 }
246 #endif
247 return bcp - code_base();
248 }
251 // Return (int)bcx if it appears to be a valid BCI.
252 // Return bci_from((address)bcx) if it appears to be a valid BCP.
253 // Return -1 otherwise.
254 // Used by profiling code, when invalid data is a possibility.
255 // The caller is responsible for validating the Method* itself.
256 int Method::validate_bci_from_bcx(intptr_t bcx) const {
257 // keep bci as -1 if not a valid bci
258 int bci = -1;
259 if (bcx == 0 || (address)bcx == code_base()) {
260 // code_size() may return 0 and we allow 0 here
261 // the method may be native
262 bci = 0;
263 } else if (frame::is_bci(bcx)) {
264 if (bcx < code_size()) {
265 bci = (int)bcx;
266 }
267 } else if (contains((address)bcx)) {
268 bci = (address)bcx - code_base();
269 }
270 // Assert that if we have dodged any asserts, bci is negative.
271 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
272 return bci;
273 }
275 address Method::bcp_from(int bci) const {
276 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci");
277 address bcp = code_base() + bci;
278 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
279 return bcp;
280 }
283 int Method::size(bool is_native) {
284 // If native, then include pointers for native_function and signature_handler
285 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
286 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
287 return align_object_size(header_size() + extra_words);
288 }
291 Symbol* Method::klass_name() const {
292 Klass* k = method_holder();
293 assert(k->is_klass(), "must be klass");
294 InstanceKlass* ik = (InstanceKlass*) k;
295 return ik->name();
296 }
299 // Attempt to return method oop to original state. Clear any pointers
300 // (to objects outside the shared spaces). We won't be able to predict
301 // where they should point in a new JVM. Further initialize some
302 // entries now in order allow them to be write protected later.
304 void Method::remove_unshareable_info() {
305 unlink_method();
306 }
309 bool Method::was_executed_more_than(int n) {
310 // Invocation counter is reset when the Method* is compiled.
311 // If the method has compiled code we therefore assume it has
312 // be excuted more than n times.
313 if (is_accessor() || is_empty_method() || (code() != NULL)) {
314 // interpreter doesn't bump invocation counter of trivial methods
315 // compiler does not bump invocation counter of compiled methods
316 return true;
317 }
318 else if ((method_counters() != NULL &&
319 method_counters()->invocation_counter()->carry()) ||
320 (method_data() != NULL &&
321 method_data()->invocation_counter()->carry())) {
322 // The carry bit is set when the counter overflows and causes
323 // a compilation to occur. We don't know how many times
324 // the counter has been reset, so we simply assume it has
325 // been executed more than n times.
326 return true;
327 } else {
328 return invocation_count() > n;
329 }
330 }
332 #ifndef PRODUCT
333 void Method::print_invocation_count() {
334 if (is_static()) tty->print("static ");
335 if (is_final()) tty->print("final ");
336 if (is_synchronized()) tty->print("synchronized ");
337 if (is_native()) tty->print("native ");
338 method_holder()->name()->print_symbol_on(tty);
339 tty->print(".");
340 name()->print_symbol_on(tty);
341 signature()->print_symbol_on(tty);
343 if (WizardMode) {
344 // dump the size of the byte codes
345 tty->print(" {%d}", code_size());
346 }
347 tty->cr();
349 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
350 tty->print_cr (" invocation_counter: %8d ", invocation_count());
351 tty->print_cr (" backedge_counter: %8d ", backedge_count());
352 if (CountCompiledCalls) {
353 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
354 }
356 }
357 #endif
359 // Build a MethodData* object to hold information about this method
360 // collected in the interpreter.
361 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
362 // Do not profile method if current thread holds the pending list lock,
363 // which avoids deadlock for acquiring the MethodData_lock.
364 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
365 return;
366 }
368 // Grab a lock here to prevent multiple
369 // MethodData*s from being created.
370 MutexLocker ml(MethodData_lock, THREAD);
371 if (method->method_data() == NULL) {
372 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
373 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);
374 method->set_method_data(method_data);
375 if (PrintMethodData && (Verbose || WizardMode)) {
376 ResourceMark rm(THREAD);
377 tty->print("build_interpreter_method_data for ");
378 method->print_name(tty);
379 tty->cr();
380 // At the end of the run, the MDO, full of data, will be dumped.
381 }
382 }
383 }
385 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
386 methodHandle mh(m);
387 ClassLoaderData* loader_data = mh->method_holder()->class_loader_data();
388 MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL);
389 if (mh->method_counters() == NULL) {
390 mh->set_method_counters(counters);
391 } else {
392 MetadataFactory::free_metadata(loader_data, counters);
393 }
394 return mh->method_counters();
395 }
397 void Method::cleanup_inline_caches() {
398 // The current system doesn't use inline caches in the interpreter
399 // => nothing to do (keep this method around for future use)
400 }
403 int Method::extra_stack_words() {
404 // not an inline function, to avoid a header dependency on Interpreter
405 return extra_stack_entries() * Interpreter::stackElementSize;
406 }
409 void Method::compute_size_of_parameters(Thread *thread) {
410 ArgumentSizeComputer asc(signature());
411 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
412 }
414 #ifdef CC_INTERP
415 void Method::set_result_index(BasicType type) {
416 _result_index = Interpreter::BasicType_as_index(type);
417 }
418 #endif
420 BasicType Method::result_type() const {
421 ResultTypeFinder rtf(signature());
422 return rtf.type();
423 }
426 bool Method::is_empty_method() const {
427 return code_size() == 1
428 && *code_base() == Bytecodes::_return;
429 }
432 bool Method::is_vanilla_constructor() const {
433 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
434 // which only calls the superclass vanilla constructor and possibly does stores of
435 // zero constants to local fields:
436 //
437 // aload_0
438 // invokespecial
439 // indexbyte1
440 // indexbyte2
441 //
442 // followed by an (optional) sequence of:
443 //
444 // aload_0
445 // aconst_null / iconst_0 / fconst_0 / dconst_0
446 // putfield
447 // indexbyte1
448 // indexbyte2
449 //
450 // followed by:
451 //
452 // return
454 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
455 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
456 int size = code_size();
457 // Check if size match
458 if (size == 0 || size % 5 != 0) return false;
459 address cb = code_base();
460 int last = size - 1;
461 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
462 // Does not call superclass default constructor
463 return false;
464 }
465 // Check optional sequence
466 for (int i = 4; i < last; i += 5) {
467 if (cb[i] != Bytecodes::_aload_0) return false;
468 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
469 if (cb[i+2] != Bytecodes::_putfield) return false;
470 }
471 return true;
472 }
475 bool Method::compute_has_loops_flag() {
476 BytecodeStream bcs(this);
477 Bytecodes::Code bc;
479 while ((bc = bcs.next()) >= 0) {
480 switch( bc ) {
481 case Bytecodes::_ifeq:
482 case Bytecodes::_ifnull:
483 case Bytecodes::_iflt:
484 case Bytecodes::_ifle:
485 case Bytecodes::_ifne:
486 case Bytecodes::_ifnonnull:
487 case Bytecodes::_ifgt:
488 case Bytecodes::_ifge:
489 case Bytecodes::_if_icmpeq:
490 case Bytecodes::_if_icmpne:
491 case Bytecodes::_if_icmplt:
492 case Bytecodes::_if_icmpgt:
493 case Bytecodes::_if_icmple:
494 case Bytecodes::_if_icmpge:
495 case Bytecodes::_if_acmpeq:
496 case Bytecodes::_if_acmpne:
497 case Bytecodes::_goto:
498 case Bytecodes::_jsr:
499 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
500 break;
502 case Bytecodes::_goto_w:
503 case Bytecodes::_jsr_w:
504 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
505 break;
506 }
507 }
508 _access_flags.set_loops_flag_init();
509 return _access_flags.has_loops();
510 }
512 bool Method::is_final_method(AccessFlags class_access_flags) const {
513 // or "does_not_require_vtable_entry"
514 // overpass can occur, is not final (reuses vtable entry)
515 // private methods get vtable entries for backward class compatibility.
516 if (is_overpass()) return false;
517 return is_final() || class_access_flags.is_final();
518 }
520 bool Method::is_final_method() const {
521 return is_final_method(method_holder()->access_flags());
522 }
524 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
525 if (is_final_method(class_access_flags)) return true;
526 #ifdef ASSERT
527 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
528 if (class_access_flags.is_interface()) assert(is_nonv == is_static(), err_msg("is_nonv=%s", is_nonv));
529 #endif
530 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
531 return vtable_index() == nonvirtual_vtable_index;
532 }
534 bool Method::can_be_statically_bound() const {
535 return can_be_statically_bound(method_holder()->access_flags());
536 }
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 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(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
579 mirrors->obj_at_put(i, 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, method_holder()->class_loader());
618 Handle prot (thread, 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 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
696 if (PrintCompilation && report) {
697 ttyLocker ttyl;
698 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
699 if (comp_level == CompLevel_all) {
700 tty->print("all levels ");
701 } else {
702 tty->print("levels ");
703 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
704 tty->print("%d ", i);
705 }
706 }
707 this->print_short_name(tty);
708 int size = this->code_size();
709 if (size > 0) {
710 tty->print(" (%d bytes)", size);
711 }
712 if (reason != NULL) {
713 tty->print(" %s", reason);
714 }
715 tty->cr();
716 }
717 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
718 ttyLocker ttyl;
719 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'",
720 is_osr ? "osr_" : "", os::current_thread_id());
721 if (reason != NULL) {
722 xtty->print(" reason=\'%s\'", reason);
723 }
724 xtty->method(this);
725 xtty->stamp();
726 xtty->end_elem();
727 }
728 }
730 bool Method::is_always_compilable() const {
731 // Generated adapters must be compiled
732 if (is_method_handle_intrinsic() && is_synthetic()) {
733 assert(!is_not_c1_compilable(), "sanity check");
734 assert(!is_not_c2_compilable(), "sanity check");
735 return true;
736 }
738 return false;
739 }
741 bool Method::is_not_compilable(int comp_level) const {
742 if (number_of_breakpoints() > 0)
743 return true;
744 if (is_always_compilable())
745 return false;
746 if (comp_level == CompLevel_any)
747 return is_not_c1_compilable() || is_not_c2_compilable();
748 if (is_c1_compile(comp_level))
749 return is_not_c1_compilable();
750 if (is_c2_compile(comp_level))
751 return is_not_c2_compilable();
752 return false;
753 }
755 // call this when compiler finds that this method is not compilable
756 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
757 if (is_always_compilable()) {
758 // Don't mark a method which should be always compilable
759 return;
760 }
761 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
762 if (comp_level == CompLevel_all) {
763 set_not_c1_compilable();
764 set_not_c2_compilable();
765 } else {
766 if (is_c1_compile(comp_level))
767 set_not_c1_compilable();
768 if (is_c2_compile(comp_level))
769 set_not_c2_compilable();
770 }
771 CompilationPolicy::policy()->disable_compilation(this);
772 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
773 }
775 bool Method::is_not_osr_compilable(int comp_level) const {
776 if (is_not_compilable(comp_level))
777 return true;
778 if (comp_level == CompLevel_any)
779 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
780 if (is_c1_compile(comp_level))
781 return is_not_c1_osr_compilable();
782 if (is_c2_compile(comp_level))
783 return is_not_c2_osr_compilable();
784 return false;
785 }
787 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
788 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
789 if (comp_level == CompLevel_all) {
790 set_not_c1_osr_compilable();
791 set_not_c2_osr_compilable();
792 } else {
793 if (is_c1_compile(comp_level))
794 set_not_c1_osr_compilable();
795 if (is_c2_compile(comp_level))
796 set_not_c2_osr_compilable();
797 }
798 CompilationPolicy::policy()->disable_compilation(this);
799 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
800 }
802 // Revert to using the interpreter and clear out the nmethod
803 void Method::clear_code() {
805 // this may be NULL if c2i adapters have not been made yet
806 // Only should happen at allocate time.
807 if (_adapter == NULL) {
808 _from_compiled_entry = NULL;
809 } else {
810 _from_compiled_entry = _adapter->get_c2i_entry();
811 }
812 OrderAccess::storestore();
813 _from_interpreted_entry = _i2i_entry;
814 OrderAccess::storestore();
815 _code = NULL;
816 }
818 // Called by class data sharing to remove any entry points (which are not shared)
819 void Method::unlink_method() {
820 _code = NULL;
821 _i2i_entry = NULL;
822 _from_interpreted_entry = NULL;
823 if (is_native()) {
824 *native_function_addr() = NULL;
825 set_signature_handler(NULL);
826 }
827 NOT_PRODUCT(set_compiled_invocation_count(0);)
828 _adapter = NULL;
829 _from_compiled_entry = NULL;
831 // In case of DumpSharedSpaces, _method_data should always be NULL.
832 //
833 // During runtime (!DumpSharedSpaces), when we are cleaning a
834 // shared class that failed to load, this->link_method() may
835 // have already been called (before an exception happened), so
836 // this->_method_data may not be NULL.
837 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?");
839 set_method_data(NULL);
840 set_method_counters(NULL);
841 }
843 // Called when the method_holder is getting linked. Setup entrypoints so the method
844 // is ready to be called from interpreter, compiler, and vtables.
845 void Method::link_method(methodHandle h_method, TRAPS) {
846 // If the code cache is full, we may reenter this function for the
847 // leftover methods that weren't linked.
848 if (_i2i_entry != NULL) return;
850 assert(_adapter == NULL, "init'd to NULL" );
851 assert( _code == NULL, "nothing compiled yet" );
853 // Setup interpreter entrypoint
854 assert(this == h_method(), "wrong h_method()" );
855 address entry = Interpreter::entry_for_method(h_method);
856 assert(entry != NULL, "interpreter entry must be non-null");
857 // Sets both _i2i_entry and _from_interpreted_entry
858 set_interpreter_entry(entry);
860 // Don't overwrite already registered native entries.
861 if (is_native() && !has_native_function()) {
862 set_native_function(
863 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
864 !native_bind_event_is_interesting);
865 }
867 // Setup compiler entrypoint. This is made eagerly, so we do not need
868 // special handling of vtables. An alternative is to make adapters more
869 // lazily by calling make_adapter() from from_compiled_entry() for the
870 // normal calls. For vtable calls life gets more complicated. When a
871 // call-site goes mega-morphic we need adapters in all methods which can be
872 // called from the vtable. We need adapters on such methods that get loaded
873 // later. Ditto for mega-morphic itable calls. If this proves to be a
874 // problem we'll make these lazily later.
875 (void) make_adapters(h_method, CHECK);
877 // ONLY USE the h_method now as make_adapter may have blocked
879 }
881 address Method::make_adapters(methodHandle mh, TRAPS) {
882 // Adapters for compiled code are made eagerly here. They are fairly
883 // small (generally < 100 bytes) and quick to make (and cached and shared)
884 // so making them eagerly shouldn't be too expensive.
885 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
886 if (adapter == NULL ) {
887 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
888 }
890 mh->set_adapter_entry(adapter);
891 mh->_from_compiled_entry = adapter->get_c2i_entry();
892 return adapter->get_c2i_entry();
893 }
895 // The verified_code_entry() must be called when a invoke is resolved
896 // on this method.
898 // It returns the compiled code entry point, after asserting not null.
899 // This function is called after potential safepoints so that nmethod
900 // or adapter that it points to is still live and valid.
901 // This function must not hit a safepoint!
902 address Method::verified_code_entry() {
903 debug_only(No_Safepoint_Verifier nsv;)
904 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
905 if (code == NULL && UseCodeCacheFlushing) {
906 nmethod *saved_code = CodeCache::reanimate_saved_code(this);
907 if (saved_code != NULL) {
908 methodHandle method(this);
909 assert( ! saved_code->is_osr_method(), "should not get here for osr" );
910 set_code( method, saved_code );
911 }
912 }
914 assert(_from_compiled_entry != NULL, "must be set");
915 return _from_compiled_entry;
916 }
918 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
919 // (could be racing a deopt).
920 // Not inline to avoid circular ref.
921 bool Method::check_code() const {
922 // cached in a register or local. There's a race on the value of the field.
923 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
924 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
925 }
927 // Install compiled code. Instantly it can execute.
928 void Method::set_code(methodHandle mh, nmethod *code) {
929 assert( code, "use clear_code to remove code" );
930 assert( mh->check_code(), "" );
932 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
934 // These writes must happen in this order, because the interpreter will
935 // directly jump to from_interpreted_entry which jumps to an i2c adapter
936 // which jumps to _from_compiled_entry.
937 mh->_code = code; // Assign before allowing compiled code to exec
939 int comp_level = code->comp_level();
940 // In theory there could be a race here. In practice it is unlikely
941 // and not worth worrying about.
942 if (comp_level > mh->highest_comp_level()) {
943 mh->set_highest_comp_level(comp_level);
944 }
946 OrderAccess::storestore();
947 #ifdef SHARK
948 mh->_from_interpreted_entry = code->insts_begin();
949 #else //!SHARK
950 mh->_from_compiled_entry = code->verified_entry_point();
951 OrderAccess::storestore();
952 // Instantly compiled code can execute.
953 if (!mh->is_method_handle_intrinsic())
954 mh->_from_interpreted_entry = mh->get_i2c_entry();
955 #endif //!SHARK
956 }
959 bool Method::is_overridden_in(Klass* k) const {
960 InstanceKlass* ik = InstanceKlass::cast(k);
962 if (ik->is_interface()) return false;
964 // If method is an interface, we skip it - except if it
965 // is a miranda method
966 if (method_holder()->is_interface()) {
967 // Check that method is not a miranda method
968 if (ik->lookup_method(name(), signature()) == NULL) {
969 // No implementation exist - so miranda method
970 return false;
971 }
972 return true;
973 }
975 assert(ik->is_subclass_of(method_holder()), "should be subklass");
976 assert(ik->vtable() != NULL, "vtable should exist");
977 if (!has_vtable_index()) {
978 return false;
979 } else {
980 Method* vt_m = ik->method_at_vtable(vtable_index());
981 return vt_m != this;
982 }
983 }
986 // give advice about whether this Method* should be cached or not
987 bool Method::should_not_be_cached() const {
988 if (is_old()) {
989 // This method has been redefined. It is either EMCP or obsolete
990 // and we don't want to cache it because that would pin the method
991 // down and prevent it from being collectible if and when it
992 // finishes executing.
993 return true;
994 }
996 // caching this method should be just fine
997 return false;
998 }
1001 /**
1002 * Returns true if this is one of the specially treated methods for
1003 * security related stack walks (like Reflection.getCallerClass).
1004 */
1005 bool Method::is_ignored_by_security_stack_walk() const {
1006 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection;
1008 if (intrinsic_id() == vmIntrinsics::_invoke) {
1009 // This is Method.invoke() -- ignore it
1010 return true;
1011 }
1012 if (use_new_reflection &&
1013 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1014 // This is an auxilary frame -- ignore it
1015 return true;
1016 }
1017 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1018 // This is an internal adapter frame for method handles -- ignore it
1019 return true;
1020 }
1021 return false;
1022 }
1025 // Constant pool structure for invoke methods:
1026 enum {
1027 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1028 _imcp_invoke_signature, // utf8: (variable Symbol*)
1029 _imcp_limit
1030 };
1032 // Test if this method is an MH adapter frame generated by Java code.
1033 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1034 bool Method::is_compiled_lambda_form() const {
1035 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1036 }
1038 // Test if this method is an internal MH primitive method.
1039 bool Method::is_method_handle_intrinsic() const {
1040 vmIntrinsics::ID iid = intrinsic_id();
1041 return (MethodHandles::is_signature_polymorphic(iid) &&
1042 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1043 }
1045 bool Method::has_member_arg() const {
1046 vmIntrinsics::ID iid = intrinsic_id();
1047 return (MethodHandles::is_signature_polymorphic(iid) &&
1048 MethodHandles::has_member_arg(iid));
1049 }
1051 // Make an instance of a signature-polymorphic internal MH primitive.
1052 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1053 Symbol* signature,
1054 TRAPS) {
1055 ResourceMark rm;
1056 methodHandle empty;
1058 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1059 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1060 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1061 if (TraceMethodHandles) {
1062 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1063 }
1065 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1066 name->increment_refcount();
1067 signature->increment_refcount();
1069 int cp_length = _imcp_limit;
1070 ClassLoaderData* loader_data = holder->class_loader_data();
1071 constantPoolHandle cp;
1072 {
1073 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1074 cp = constantPoolHandle(THREAD, cp_oop);
1075 }
1076 cp->set_pool_holder(InstanceKlass::cast(holder()));
1077 cp->symbol_at_put(_imcp_invoke_name, name);
1078 cp->symbol_at_put(_imcp_invoke_signature, signature);
1079 cp->set_has_preresolution();
1081 // decide on access bits: public or not?
1082 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1083 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1084 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1085 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1087 methodHandle m;
1088 {
1089 InlineTableSizes sizes;
1090 Method* m_oop = Method::allocate(loader_data, 0,
1091 accessFlags_from(flags_bits), &sizes,
1092 ConstMethod::NORMAL, CHECK_(empty));
1093 m = methodHandle(THREAD, m_oop);
1094 }
1095 m->set_constants(cp());
1096 m->set_name_index(_imcp_invoke_name);
1097 m->set_signature_index(_imcp_invoke_signature);
1098 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1099 assert(m->signature() == signature, "");
1100 #ifdef CC_INTERP
1101 ResultTypeFinder rtf(signature);
1102 m->set_result_index(rtf.type());
1103 #endif
1104 m->compute_size_of_parameters(THREAD);
1105 m->init_intrinsic_id();
1106 assert(m->is_method_handle_intrinsic(), "");
1107 #ifdef ASSERT
1108 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1109 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1110 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1111 #endif //ASSERT
1113 // Finally, set up its entry points.
1114 assert(m->can_be_statically_bound(), "");
1115 m->set_vtable_index(Method::nonvirtual_vtable_index);
1116 m->link_method(m, CHECK_(empty));
1118 if (TraceMethodHandles && (Verbose || WizardMode))
1119 m->print_on(tty);
1121 return m;
1122 }
1124 Klass* Method::check_non_bcp_klass(Klass* klass) {
1125 if (klass != NULL && klass->class_loader() != NULL) {
1126 if (klass->oop_is_objArray())
1127 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1128 return klass;
1129 }
1130 return NULL;
1131 }
1134 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1135 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1136 // Code below does not work for native methods - they should never get rewritten anyway
1137 assert(!m->is_native(), "cannot rewrite native methods");
1138 // Allocate new Method*
1139 AccessFlags flags = m->access_flags();
1141 ConstMethod* cm = m->constMethod();
1142 int checked_exceptions_len = cm->checked_exceptions_length();
1143 int localvariable_len = cm->localvariable_table_length();
1144 int exception_table_len = cm->exception_table_length();
1145 int method_parameters_len = cm->method_parameters_length();
1146 int method_annotations_len = cm->method_annotations_length();
1147 int parameter_annotations_len = cm->parameter_annotations_length();
1148 int type_annotations_len = cm->type_annotations_length();
1149 int default_annotations_len = cm->default_annotations_length();
1151 InlineTableSizes sizes(
1152 localvariable_len,
1153 new_compressed_linenumber_size,
1154 exception_table_len,
1155 checked_exceptions_len,
1156 method_parameters_len,
1157 cm->generic_signature_index(),
1158 method_annotations_len,
1159 parameter_annotations_len,
1160 type_annotations_len,
1161 default_annotations_len,
1162 0);
1164 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1165 Method* newm_oop = Method::allocate(loader_data,
1166 new_code_length,
1167 flags,
1168 &sizes,
1169 m->method_type(),
1170 CHECK_(methodHandle()));
1171 methodHandle newm (THREAD, newm_oop);
1172 int new_method_size = newm->method_size();
1174 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1175 ConstMethod* newcm = newm->constMethod();
1176 int new_const_method_size = newm->constMethod()->size();
1178 memcpy(newm(), m(), sizeof(Method));
1180 // Create shallow copy of ConstMethod.
1181 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1183 // Reset correct method/const method, method size, and parameter info
1184 newm->set_constMethod(newcm);
1185 newm->constMethod()->set_code_size(new_code_length);
1186 newm->constMethod()->set_constMethod_size(new_const_method_size);
1187 newm->set_method_size(new_method_size);
1188 assert(newm->code_size() == new_code_length, "check");
1189 assert(newm->method_parameters_length() == method_parameters_len, "check");
1190 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1191 assert(newm->exception_table_length() == exception_table_len, "check");
1192 assert(newm->localvariable_table_length() == localvariable_len, "check");
1193 // Copy new byte codes
1194 memcpy(newm->code_base(), new_code, new_code_length);
1195 // Copy line number table
1196 if (new_compressed_linenumber_size > 0) {
1197 memcpy(newm->compressed_linenumber_table(),
1198 new_compressed_linenumber_table,
1199 new_compressed_linenumber_size);
1200 }
1201 // Copy method_parameters
1202 if (method_parameters_len > 0) {
1203 memcpy(newm->method_parameters_start(),
1204 m->method_parameters_start(),
1205 method_parameters_len * sizeof(MethodParametersElement));
1206 }
1207 // Copy checked_exceptions
1208 if (checked_exceptions_len > 0) {
1209 memcpy(newm->checked_exceptions_start(),
1210 m->checked_exceptions_start(),
1211 checked_exceptions_len * sizeof(CheckedExceptionElement));
1212 }
1213 // Copy exception table
1214 if (exception_table_len > 0) {
1215 memcpy(newm->exception_table_start(),
1216 m->exception_table_start(),
1217 exception_table_len * sizeof(ExceptionTableElement));
1218 }
1219 // Copy local variable number table
1220 if (localvariable_len > 0) {
1221 memcpy(newm->localvariable_table_start(),
1222 m->localvariable_table_start(),
1223 localvariable_len * sizeof(LocalVariableTableElement));
1224 }
1225 // Copy stackmap table
1226 if (m->has_stackmap_table()) {
1227 int code_attribute_length = m->stackmap_data()->length();
1228 Array<u1>* stackmap_data =
1229 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1230 memcpy((void*)stackmap_data->adr_at(0),
1231 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1232 newm->set_stackmap_data(stackmap_data);
1233 }
1235 // copy annotations over to new method
1236 newcm->copy_annotations_from(cm);
1237 return newm;
1238 }
1240 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1241 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1242 // because we are not loading from core libraries
1243 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1244 // which does not use the class default class loader so we check for its loader here
1245 InstanceKlass* ik = InstanceKlass::cast(holder);
1246 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) {
1247 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1248 }
1250 // see if the klass name is well-known:
1251 Symbol* klass_name = ik->name();
1252 return vmSymbols::find_sid(klass_name);
1253 }
1255 void Method::init_intrinsic_id() {
1256 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1257 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1258 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1259 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1261 // the klass name is well-known:
1262 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1263 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1265 // ditto for method and signature:
1266 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1267 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1268 && name_id == vmSymbols::NO_SID)
1269 return;
1270 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1271 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1272 && sig_id == vmSymbols::NO_SID) return;
1273 jshort flags = access_flags().as_short();
1275 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1276 if (id != vmIntrinsics::_none) {
1277 set_intrinsic_id(id);
1278 return;
1279 }
1281 // A few slightly irregular cases:
1282 switch (klass_id) {
1283 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1284 // Second chance: check in regular Math.
1285 switch (name_id) {
1286 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1287 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1288 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1289 // pretend it is the corresponding method in the non-strict class:
1290 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1291 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1292 break;
1293 }
1294 break;
1296 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1297 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1298 if (!is_native()) break;
1299 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1300 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1301 id = vmIntrinsics::_none;
1302 break;
1303 }
1305 if (id != vmIntrinsics::_none) {
1306 // Set up its iid. It is an alias method.
1307 set_intrinsic_id(id);
1308 return;
1309 }
1310 }
1312 // These two methods are static since a GC may move the Method
1313 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1314 if (THREAD->is_Compiler_thread()) {
1315 // There is nothing useful this routine can do from within the Compile thread.
1316 // Hopefully, the signature contains only well-known classes.
1317 // We could scan for this and return true/false, but the caller won't care.
1318 return false;
1319 }
1320 bool sig_is_loaded = true;
1321 Handle class_loader(THREAD, m->method_holder()->class_loader());
1322 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1323 ResourceMark rm(THREAD);
1324 Symbol* signature = m->signature();
1325 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1326 if (ss.is_object()) {
1327 Symbol* sym = ss.as_symbol(CHECK_(false));
1328 Symbol* name = sym;
1329 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1330 protection_domain, THREAD);
1331 // We are loading classes eagerly. If a ClassNotFoundException or
1332 // a LinkageError was generated, be sure to ignore it.
1333 if (HAS_PENDING_EXCEPTION) {
1334 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1335 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1336 CLEAR_PENDING_EXCEPTION;
1337 } else {
1338 return false;
1339 }
1340 }
1341 if( klass == NULL) { sig_is_loaded = false; }
1342 }
1343 }
1344 return sig_is_loaded;
1345 }
1347 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1348 Handle class_loader(THREAD, m->method_holder()->class_loader());
1349 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1350 ResourceMark rm(THREAD);
1351 Symbol* signature = m->signature();
1352 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1353 if (ss.type() == T_OBJECT) {
1354 Symbol* name = ss.as_symbol_or_null();
1355 if (name == NULL) return true;
1356 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1357 if (klass == NULL) return true;
1358 }
1359 }
1360 return false;
1361 }
1363 // Exposed so field engineers can debug VM
1364 void Method::print_short_name(outputStream* st) {
1365 ResourceMark rm;
1366 #ifdef PRODUCT
1367 st->print(" %s::", method_holder()->external_name());
1368 #else
1369 st->print(" %s::", method_holder()->internal_name());
1370 #endif
1371 name()->print_symbol_on(st);
1372 if (WizardMode) signature()->print_symbol_on(st);
1373 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1374 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1375 }
1377 // Comparer for sorting an object array containing
1378 // Method*s.
1379 static int method_comparator(Method* a, Method* b) {
1380 return a->name()->fast_compare(b->name());
1381 }
1383 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1384 void Method::sort_methods(Array<Method*>* methods, bool idempotent) {
1385 int length = methods->length();
1386 if (length > 1) {
1387 {
1388 No_Safepoint_Verifier nsv;
1389 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1390 }
1391 // Reset method ordering
1392 for (int i = 0; i < length; i++) {
1393 Method* m = methods->at(i);
1394 m->set_method_idnum(i);
1395 }
1396 }
1397 }
1400 //-----------------------------------------------------------------------------------
1401 // Non-product code unless JVM/TI needs it
1403 #if !defined(PRODUCT) || INCLUDE_JVMTI
1404 class SignatureTypePrinter : public SignatureTypeNames {
1405 private:
1406 outputStream* _st;
1407 bool _use_separator;
1409 void type_name(const char* name) {
1410 if (_use_separator) _st->print(", ");
1411 _st->print(name);
1412 _use_separator = true;
1413 }
1415 public:
1416 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1417 _st = st;
1418 _use_separator = false;
1419 }
1421 void print_parameters() { _use_separator = false; iterate_parameters(); }
1422 void print_returntype() { _use_separator = false; iterate_returntype(); }
1423 };
1426 void Method::print_name(outputStream* st) {
1427 Thread *thread = Thread::current();
1428 ResourceMark rm(thread);
1429 SignatureTypePrinter sig(signature(), st);
1430 st->print("%s ", is_static() ? "static" : "virtual");
1431 sig.print_returntype();
1432 st->print(" %s.", method_holder()->internal_name());
1433 name()->print_symbol_on(st);
1434 st->print("(");
1435 sig.print_parameters();
1436 st->print(")");
1437 }
1438 #endif // !PRODUCT || INCLUDE_JVMTI
1441 //-----------------------------------------------------------------------------------
1442 // Non-product code
1444 #ifndef PRODUCT
1445 void Method::print_codes_on(outputStream* st) const {
1446 print_codes_on(0, code_size(), st);
1447 }
1449 void Method::print_codes_on(int from, int to, outputStream* st) const {
1450 Thread *thread = Thread::current();
1451 ResourceMark rm(thread);
1452 methodHandle mh (thread, (Method*)this);
1453 BytecodeStream s(mh);
1454 s.set_interval(from, to);
1455 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1456 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1457 }
1458 #endif // not PRODUCT
1461 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1462 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1463 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1464 // as end-of-stream terminator.
1466 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1467 // bci and line number does not compress into single byte.
1468 // Write out escape character and use regular compression for bci and line number.
1469 write_byte((jubyte)0xFF);
1470 write_signed_int(bci_delta);
1471 write_signed_int(line_delta);
1472 }
1474 // See comment in method.hpp which explains why this exists.
1475 #if defined(_M_AMD64) && _MSC_VER >= 1400
1476 #pragma optimize("", off)
1477 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1478 write_pair_inline(bci, line);
1479 }
1480 #pragma optimize("", on)
1481 #endif
1483 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1484 _bci = 0;
1485 _line = 0;
1486 };
1489 bool CompressedLineNumberReadStream::read_pair() {
1490 jubyte next = read_byte();
1491 // Check for terminator
1492 if (next == 0) return false;
1493 if (next == 0xFF) {
1494 // Escape character, regular compression used
1495 _bci += read_signed_int();
1496 _line += read_signed_int();
1497 } else {
1498 // Single byte compression used
1499 _bci += next >> 3;
1500 _line += next & 0x7;
1501 }
1502 return true;
1503 }
1506 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1507 BreakpointInfo* bp = method_holder()->breakpoints();
1508 for (; bp != NULL; bp = bp->next()) {
1509 if (bp->match(this, bci)) {
1510 return bp->orig_bytecode();
1511 }
1512 }
1513 ShouldNotReachHere();
1514 return Bytecodes::_shouldnotreachhere;
1515 }
1517 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1518 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1519 BreakpointInfo* bp = method_holder()->breakpoints();
1520 for (; bp != NULL; bp = bp->next()) {
1521 if (bp->match(this, bci)) {
1522 bp->set_orig_bytecode(code);
1523 // and continue, in case there is more than one
1524 }
1525 }
1526 }
1528 void Method::set_breakpoint(int bci) {
1529 InstanceKlass* ik = method_holder();
1530 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1531 bp->set_next(ik->breakpoints());
1532 ik->set_breakpoints(bp);
1533 // do this last:
1534 bp->set(this);
1535 }
1537 static void clear_matches(Method* m, int bci) {
1538 InstanceKlass* ik = m->method_holder();
1539 BreakpointInfo* prev_bp = NULL;
1540 BreakpointInfo* next_bp;
1541 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1542 next_bp = bp->next();
1543 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1544 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1545 // do this first:
1546 bp->clear(m);
1547 // unhook it
1548 if (prev_bp != NULL)
1549 prev_bp->set_next(next_bp);
1550 else
1551 ik->set_breakpoints(next_bp);
1552 delete bp;
1553 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1554 // at same location. So we have multiple matching (method_index and bci)
1555 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1556 // breakpoint for clear_breakpoint request and keep all other method versions
1557 // BreakpointInfo for future clear_breakpoint request.
1558 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1559 // which is being called when class is unloaded. We delete all the Breakpoint
1560 // information for all versions of method. We may not correctly restore the original
1561 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1562 // so these methods won't be used anymore.
1563 if (bci >= 0) {
1564 break;
1565 }
1566 } else {
1567 // This one is a keeper.
1568 prev_bp = bp;
1569 }
1570 }
1571 }
1573 void Method::clear_breakpoint(int bci) {
1574 assert(bci >= 0, "");
1575 clear_matches(this, bci);
1576 }
1578 void Method::clear_all_breakpoints() {
1579 clear_matches(this, -1);
1580 }
1583 int Method::invocation_count() {
1584 MethodCounters *mcs = method_counters();
1585 if (TieredCompilation) {
1586 MethodData* const mdo = method_data();
1587 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1588 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1589 return InvocationCounter::count_limit;
1590 } else {
1591 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1592 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1593 }
1594 } else {
1595 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1596 }
1597 }
1599 int Method::backedge_count() {
1600 MethodCounters *mcs = method_counters();
1601 if (TieredCompilation) {
1602 MethodData* const mdo = method_data();
1603 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1604 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1605 return InvocationCounter::count_limit;
1606 } else {
1607 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1608 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1609 }
1610 } else {
1611 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1612 }
1613 }
1615 int Method::highest_comp_level() const {
1616 const MethodData* mdo = method_data();
1617 if (mdo != NULL) {
1618 return mdo->highest_comp_level();
1619 } else {
1620 return CompLevel_none;
1621 }
1622 }
1624 int Method::highest_osr_comp_level() const {
1625 const MethodData* mdo = method_data();
1626 if (mdo != NULL) {
1627 return mdo->highest_osr_comp_level();
1628 } else {
1629 return CompLevel_none;
1630 }
1631 }
1633 void Method::set_highest_comp_level(int level) {
1634 MethodData* mdo = method_data();
1635 if (mdo != NULL) {
1636 mdo->set_highest_comp_level(level);
1637 }
1638 }
1640 void Method::set_highest_osr_comp_level(int level) {
1641 MethodData* mdo = method_data();
1642 if (mdo != NULL) {
1643 mdo->set_highest_osr_comp_level(level);
1644 }
1645 }
1647 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1648 _bci = bci;
1649 _name_index = m->name_index();
1650 _signature_index = m->signature_index();
1651 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1652 if (_orig_bytecode == Bytecodes::_breakpoint)
1653 _orig_bytecode = m->orig_bytecode_at(_bci);
1654 _next = NULL;
1655 }
1657 void BreakpointInfo::set(Method* method) {
1658 #ifdef ASSERT
1659 {
1660 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1661 if (code == Bytecodes::_breakpoint)
1662 code = method->orig_bytecode_at(_bci);
1663 assert(orig_bytecode() == code, "original bytecode must be the same");
1664 }
1665 #endif
1666 Thread *thread = Thread::current();
1667 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1668 method->incr_number_of_breakpoints(thread);
1669 SystemDictionary::notice_modification();
1670 {
1671 // Deoptimize all dependents on this method
1672 HandleMark hm(thread);
1673 methodHandle mh(thread, method);
1674 Universe::flush_dependents_on_method(mh);
1675 }
1676 }
1678 void BreakpointInfo::clear(Method* method) {
1679 *method->bcp_from(_bci) = orig_bytecode();
1680 assert(method->number_of_breakpoints() > 0, "must not go negative");
1681 method->decr_number_of_breakpoints(Thread::current());
1682 }
1684 // jmethodID handling
1686 // This is a block allocating object, sort of like JNIHandleBlock, only a
1687 // lot simpler. There aren't many of these, they aren't long, they are rarely
1688 // deleted and so we can do some suboptimal things.
1689 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1690 // never get rid of it.
1691 // It would be nice to be able to parameterize the number of methods for
1692 // the null_class_loader but then we'd have to turn this and ClassLoaderData
1693 // into templates.
1695 // I feel like this brain dead class should exist somewhere in the STL
1697 class JNIMethodBlock : public CHeapObj<mtClass> {
1698 enum { number_of_methods = 8 };
1700 Method* _methods[number_of_methods];
1701 int _top;
1702 JNIMethodBlock* _next;
1703 public:
1704 static Method* const _free_method;
1706 JNIMethodBlock() : _next(NULL), _top(0) {
1707 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method;
1708 }
1710 Method** add_method(Method* m) {
1711 if (_top < number_of_methods) {
1712 // top points to the next free entry.
1713 int i = _top;
1714 _methods[i] = m;
1715 _top++;
1716 return &_methods[i];
1717 } else if (_top == number_of_methods) {
1718 // if the next free entry ran off the block see if there's a free entry
1719 for (int i = 0; i< number_of_methods; i++) {
1720 if (_methods[i] == _free_method) {
1721 _methods[i] = m;
1722 return &_methods[i];
1723 }
1724 }
1725 // Only check each block once for frees. They're very unlikely.
1726 // Increment top past the end of the block.
1727 _top++;
1728 }
1729 // need to allocate a next block.
1730 if (_next == NULL) {
1731 _next = new JNIMethodBlock();
1732 }
1733 return _next->add_method(m);
1734 }
1736 bool contains(Method** m) {
1737 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1738 for (int i = 0; i< number_of_methods; i++) {
1739 if (&(b->_methods[i]) == m) {
1740 return true;
1741 }
1742 }
1743 }
1744 return false; // not found
1745 }
1747 // Doesn't really destroy it, just marks it as free so it can be reused.
1748 void destroy_method(Method** m) {
1749 #ifdef ASSERT
1750 assert(contains(m), "should be a methodID");
1751 #endif // ASSERT
1752 *m = _free_method;
1753 }
1755 // During class unloading the methods are cleared, which is different
1756 // than freed.
1757 void clear_all_methods() {
1758 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1759 for (int i = 0; i< number_of_methods; i++) {
1760 _methods[i] = NULL;
1761 }
1762 }
1763 }
1764 #ifndef PRODUCT
1765 int count_methods() {
1766 // count all allocated methods
1767 int count = 0;
1768 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1769 for (int i = 0; i< number_of_methods; i++) {
1770 if (_methods[i] != _free_method) count++;
1771 }
1772 }
1773 return count;
1774 }
1775 #endif // PRODUCT
1776 };
1778 // Something that can't be mistaken for an address or a markOop
1779 Method* const JNIMethodBlock::_free_method = (Method*)55;
1781 // Add a method id to the jmethod_ids
1782 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
1783 ClassLoaderData* cld = loader_data;
1785 if (!SafepointSynchronize::is_at_safepoint()) {
1786 // Have to add jmethod_ids() to class loader data thread-safely.
1787 // Also have to add the method to the list safely, which the cld lock
1788 // protects as well.
1789 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1790 if (cld->jmethod_ids() == NULL) {
1791 cld->set_jmethod_ids(new JNIMethodBlock());
1792 }
1793 // jmethodID is a pointer to Method*
1794 return (jmethodID)cld->jmethod_ids()->add_method(m);
1795 } else {
1796 // At safepoint, we are single threaded and can set this.
1797 if (cld->jmethod_ids() == NULL) {
1798 cld->set_jmethod_ids(new JNIMethodBlock());
1799 }
1800 // jmethodID is a pointer to Method*
1801 return (jmethodID)cld->jmethod_ids()->add_method(m);
1802 }
1803 }
1805 // Mark a jmethodID as free. This is called when there is a data race in
1806 // InstanceKlass while creating the jmethodID cache.
1807 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
1808 ClassLoaderData* cld = loader_data;
1809 Method** ptr = (Method**)m;
1810 assert(cld->jmethod_ids() != NULL, "should have method handles");
1811 cld->jmethod_ids()->destroy_method(ptr);
1812 }
1814 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
1815 // Can't assert the method_holder is the same because the new method has the
1816 // scratch method holder.
1817 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
1818 == new_method->method_holder()->class_loader(),
1819 "changing to a different class loader");
1820 // Just change the method in place, jmethodID pointer doesn't change.
1821 *((Method**)jmid) = new_method;
1822 }
1824 bool Method::is_method_id(jmethodID mid) {
1825 Method* m = resolve_jmethod_id(mid);
1826 assert(m != NULL, "should be called with non-null method");
1827 InstanceKlass* ik = m->method_holder();
1828 ClassLoaderData* cld = ik->class_loader_data();
1829 if (cld->jmethod_ids() == NULL) return false;
1830 return (cld->jmethod_ids()->contains((Method**)mid));
1831 }
1833 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
1834 if (mid == NULL) return NULL;
1835 Method* o = resolve_jmethod_id(mid);
1836 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
1837 return NULL;
1838 }
1839 return o;
1840 };
1842 void Method::set_on_stack(const bool value) {
1843 // Set both the method itself and its constant pool. The constant pool
1844 // on stack means some method referring to it is also on the stack.
1845 _access_flags.set_on_stack(value);
1846 constants()->set_on_stack(value);
1847 if (value) MetadataOnStackMark::record(this);
1848 }
1850 // Called when the class loader is unloaded to make all methods weak.
1851 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1852 loader_data->jmethod_ids()->clear_all_methods();
1853 }
1856 // Check that this pointer is valid by checking that the vtbl pointer matches
1857 bool Method::is_valid_method() const {
1858 if (this == NULL) {
1859 return false;
1860 } else if (!is_metaspace_object()) {
1861 return false;
1862 } else {
1863 Method m;
1864 // This assumes that the vtbl pointer is the first word of a C++ object.
1865 // This assumption is also in universe.cpp patch_klass_vtble
1866 void* vtbl2 = dereference_vptr((void*)&m);
1867 void* this_vtbl = dereference_vptr((void*)this);
1868 return vtbl2 == this_vtbl;
1869 }
1870 }
1872 #ifndef PRODUCT
1873 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1874 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1875 }
1876 #endif // PRODUCT
1879 // Printing
1881 #ifndef PRODUCT
1883 void Method::print_on(outputStream* st) const {
1884 ResourceMark rm;
1885 assert(is_method(), "must be method");
1886 st->print_cr(internal_name());
1887 // get the effect of PrintOopAddress, always, for methods:
1888 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this);
1889 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
1890 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants());
1891 constants()->print_value_on(st); st->cr();
1892 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
1893 st->print (" - name: "); name()->print_value_on(st); st->cr();
1894 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
1895 st->print_cr(" - max stack: %d", max_stack());
1896 st->print_cr(" - max locals: %d", max_locals());
1897 st->print_cr(" - size of params: %d", size_of_parameters());
1898 st->print_cr(" - method size: %d", method_size());
1899 if (intrinsic_id() != vmIntrinsics::_none)
1900 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
1901 if (highest_comp_level() != CompLevel_none)
1902 st->print_cr(" - highest level: %d", highest_comp_level());
1903 st->print_cr(" - vtable index: %d", _vtable_index);
1904 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
1905 st->print( " - adapters: ");
1906 AdapterHandlerEntry* a = ((Method*)this)->adapter();
1907 if (a == NULL)
1908 st->print_cr(INTPTR_FORMAT, a);
1909 else
1910 a->print_adapter_on(st);
1911 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
1912 st->print_cr(" - code size: %d", code_size());
1913 if (code_size() != 0) {
1914 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
1915 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
1916 }
1917 if (method_data() != NULL) {
1918 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
1919 }
1920 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
1921 if (checked_exceptions_length() > 0) {
1922 CheckedExceptionElement* table = checked_exceptions_start();
1923 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
1924 if (Verbose) {
1925 for (int i = 0; i < checked_exceptions_length(); i++) {
1926 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
1927 }
1928 }
1929 }
1930 if (has_linenumber_table()) {
1931 u_char* table = compressed_linenumber_table();
1932 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
1933 if (Verbose) {
1934 CompressedLineNumberReadStream stream(table);
1935 while (stream.read_pair()) {
1936 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
1937 }
1938 }
1939 }
1940 st->print_cr(" - localvar length: %d", localvariable_table_length());
1941 if (localvariable_table_length() > 0) {
1942 LocalVariableTableElement* table = localvariable_table_start();
1943 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
1944 if (Verbose) {
1945 for (int i = 0; i < localvariable_table_length(); i++) {
1946 int bci = table[i].start_bci;
1947 int len = table[i].length;
1948 const char* name = constants()->printable_name_at(table[i].name_cp_index);
1949 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
1950 int slot = table[i].slot;
1951 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
1952 }
1953 }
1954 }
1955 if (code() != NULL) {
1956 st->print (" - compiled code: ");
1957 code()->print_value_on(st);
1958 }
1959 if (is_native()) {
1960 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
1961 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
1962 }
1963 }
1965 #endif //PRODUCT
1967 void Method::print_value_on(outputStream* st) const {
1968 assert(is_method(), "must be method");
1969 st->print(internal_name());
1970 print_address_on(st);
1971 st->print(" ");
1972 name()->print_value_on(st);
1973 st->print(" ");
1974 signature()->print_value_on(st);
1975 st->print(" in ");
1976 method_holder()->print_value_on(st);
1977 if (WizardMode) st->print("#%d", _vtable_index);
1978 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
1979 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
1980 }
1982 #if INCLUDE_SERVICES
1983 // Size Statistics
1984 void Method::collect_statistics(KlassSizeStats *sz) const {
1985 int mysize = sz->count(this);
1986 sz->_method_bytes += mysize;
1987 sz->_method_all_bytes += mysize;
1988 sz->_rw_bytes += mysize;
1990 if (constMethod()) {
1991 constMethod()->collect_statistics(sz);
1992 }
1993 if (method_data()) {
1994 method_data()->collect_statistics(sz);
1995 }
1996 }
1997 #endif // INCLUDE_SERVICES
1999 // Verification
2001 void Method::verify_on(outputStream* st) {
2002 guarantee(is_method(), "object must be method");
2003 guarantee(constants()->is_constantPool(), "should be constant pool");
2004 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2005 MethodData* md = method_data();
2006 guarantee(md == NULL ||
2007 md->is_methodData(), "should be method data");
2008 }