Mon, 27 Jun 2016 16:08:34 +0800
[Code Reorganization] Removed compilation policy related modifications made by Loongson.
1 /*
2 * Copyright (c) 1997, 2014, 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"
58 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
60 // Implementation of Method
62 Method* Method::allocate(ClassLoaderData* loader_data,
63 int byte_code_size,
64 AccessFlags access_flags,
65 InlineTableSizes* sizes,
66 ConstMethod::MethodType method_type,
67 TRAPS) {
68 assert(!access_flags.is_native() || byte_code_size == 0,
69 "native methods should not contain byte codes");
70 ConstMethod* cm = ConstMethod::allocate(loader_data,
71 byte_code_size,
72 sizes,
73 method_type,
74 CHECK_NULL);
76 int size = Method::size(access_flags.is_native());
78 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, size);
79 }
81 Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) {
82 No_Safepoint_Verifier no_safepoint;
83 set_constMethod(xconst);
84 set_access_flags(access_flags);
85 set_method_size(size);
86 #ifdef CC_INTERP
87 set_result_index(T_VOID);
88 #endif
89 set_intrinsic_id(vmIntrinsics::_none);
90 set_jfr_towrite(false);
91 set_force_inline(false);
92 set_hidden(false);
93 set_dont_inline(false);
94 set_method_data(NULL);
95 set_method_counters(NULL);
96 set_vtable_index(Method::garbage_vtable_index);
98 // Fix and bury in Method*
99 set_interpreter_entry(NULL); // sets i2i entry and from_int
100 set_adapter_entry(NULL);
101 clear_code(); // from_c/from_i get set to c2i/i2i
103 if (access_flags.is_native()) {
104 clear_native_function();
105 set_signature_handler(NULL);
106 }
108 NOT_PRODUCT(set_compiled_invocation_count(0);)
109 }
111 // Release Method*. The nmethod will be gone when we get here because
112 // we've walked the code cache.
113 void Method::deallocate_contents(ClassLoaderData* loader_data) {
114 MetadataFactory::free_metadata(loader_data, constMethod());
115 set_constMethod(NULL);
116 MetadataFactory::free_metadata(loader_data, method_data());
117 set_method_data(NULL);
118 MetadataFactory::free_metadata(loader_data, method_counters());
119 set_method_counters(NULL);
120 // The nmethod will be gone when we get here.
121 if (code() != NULL) _code = NULL;
122 }
124 address Method::get_i2c_entry() {
125 assert(_adapter != NULL, "must have");
126 return _adapter->get_i2c_entry();
127 }
129 address Method::get_c2i_entry() {
130 assert(_adapter != NULL, "must have");
131 return _adapter->get_c2i_entry();
132 }
134 address Method::get_c2i_unverified_entry() {
135 assert(_adapter != NULL, "must have");
136 return _adapter->get_c2i_unverified_entry();
137 }
139 char* Method::name_and_sig_as_C_string() const {
140 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
141 }
143 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
144 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
145 }
147 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
148 const char* klass_name = klass->external_name();
149 int klass_name_len = (int)strlen(klass_name);
150 int method_name_len = method_name->utf8_length();
151 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
152 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
153 strcpy(dest, klass_name);
154 dest[klass_name_len] = '.';
155 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
156 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
157 dest[len] = 0;
158 return dest;
159 }
161 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
162 Symbol* klass_name = klass->name();
163 klass_name->as_klass_external_name(buf, size);
164 int len = (int)strlen(buf);
166 if (len < size - 1) {
167 buf[len++] = '.';
169 method_name->as_C_string(&(buf[len]), size - len);
170 len = (int)strlen(buf);
172 signature->as_C_string(&(buf[len]), size - len);
173 }
175 return buf;
176 }
178 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) {
179 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
180 // access exception table
181 ExceptionTable table(mh());
182 int length = table.length();
183 // iterate through all entries sequentially
184 constantPoolHandle pool(THREAD, mh->constants());
185 for (int i = 0; i < length; i ++) {
186 //reacquire the table in case a GC happened
187 ExceptionTable table(mh());
188 int beg_bci = table.start_pc(i);
189 int end_bci = table.end_pc(i);
190 assert(beg_bci <= end_bci, "inconsistent exception table");
191 if (beg_bci <= throw_bci && throw_bci < end_bci) {
192 // exception handler bci range covers throw_bci => investigate further
193 int handler_bci = table.handler_pc(i);
194 int klass_index = table.catch_type_index(i);
195 if (klass_index == 0) {
196 return handler_bci;
197 } else if (ex_klass.is_null()) {
198 return handler_bci;
199 } else {
200 // we know the exception class => get the constraint class
201 // this may require loading of the constraint class; if verification
202 // fails or some other exception occurs, return handler_bci
203 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
204 KlassHandle klass = KlassHandle(THREAD, k);
205 assert(klass.not_null(), "klass not loaded");
206 if (ex_klass->is_subtype_of(klass())) {
207 return handler_bci;
208 }
209 }
210 }
211 }
213 return -1;
214 }
216 void Method::mask_for(int bci, InterpreterOopMap* mask) {
218 Thread* myThread = Thread::current();
219 methodHandle h_this(myThread, this);
220 #ifdef ASSERT
221 bool has_capability = myThread->is_VM_thread() ||
222 myThread->is_ConcurrentGC_thread() ||
223 myThread->is_GC_task_thread();
225 if (!has_capability) {
226 if (!VerifyStack && !VerifyLastFrame) {
227 // verify stack calls this outside VM thread
228 warning("oopmap should only be accessed by the "
229 "VM, GC task or CMS threads (or during debugging)");
230 InterpreterOopMap local_mask;
231 method_holder()->mask_for(h_this, bci, &local_mask);
232 local_mask.print();
233 }
234 }
235 #endif
236 method_holder()->mask_for(h_this, bci, mask);
237 return;
238 }
241 int Method::bci_from(address bcp) const {
242 #ifdef ASSERT
243 { ResourceMark rm;
244 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
245 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string()));
246 }
247 #endif
248 return bcp - code_base();
249 }
252 // Return (int)bcx if it appears to be a valid BCI.
253 // Return bci_from((address)bcx) if it appears to be a valid BCP.
254 // Return -1 otherwise.
255 // Used by profiling code, when invalid data is a possibility.
256 // The caller is responsible for validating the Method* itself.
257 int Method::validate_bci_from_bcx(intptr_t bcx) const {
258 // keep bci as -1 if not a valid bci
259 int bci = -1;
260 if (bcx == 0 || (address)bcx == code_base()) {
261 // code_size() may return 0 and we allow 0 here
262 // the method may be native
263 bci = 0;
264 } else if (frame::is_bci(bcx)) {
265 if (bcx < code_size()) {
266 bci = (int)bcx;
267 }
268 } else if (contains((address)bcx)) {
269 bci = (address)bcx - code_base();
270 }
271 // Assert that if we have dodged any asserts, bci is negative.
272 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
273 return bci;
274 }
276 address Method::bcp_from(int bci) const {
277 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), err_msg("illegal bci: %d", bci));
278 address bcp = code_base() + bci;
279 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
280 return bcp;
281 }
284 int Method::size(bool is_native) {
285 // If native, then include pointers for native_function and signature_handler
286 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
287 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
288 return align_object_size(header_size() + extra_words);
289 }
292 Symbol* Method::klass_name() const {
293 Klass* k = method_holder();
294 assert(k->is_klass(), "must be klass");
295 InstanceKlass* ik = (InstanceKlass*) k;
296 return ik->name();
297 }
300 // Attempt to return method oop to original state. Clear any pointers
301 // (to objects outside the shared spaces). We won't be able to predict
302 // where they should point in a new JVM. Further initialize some
303 // entries now in order allow them to be write protected later.
305 void Method::remove_unshareable_info() {
306 unlink_method();
307 }
310 bool Method::was_executed_more_than(int n) {
311 // Invocation counter is reset when the Method* is compiled.
312 // If the method has compiled code we therefore assume it has
313 // be excuted more than n times.
314 if (is_accessor() || is_empty_method() || (code() != NULL)) {
315 // interpreter doesn't bump invocation counter of trivial methods
316 // compiler does not bump invocation counter of compiled methods
317 return true;
318 }
319 else if ((method_counters() != NULL &&
320 method_counters()->invocation_counter()->carry()) ||
321 (method_data() != NULL &&
322 method_data()->invocation_counter()->carry())) {
323 // The carry bit is set when the counter overflows and causes
324 // a compilation to occur. We don't know how many times
325 // the counter has been reset, so we simply assume it has
326 // been executed more than n times.
327 return true;
328 } else {
329 return invocation_count() > n;
330 }
331 }
333 #ifndef PRODUCT
334 void Method::print_invocation_count() {
335 if (is_static()) tty->print("static ");
336 if (is_final()) tty->print("final ");
337 if (is_synchronized()) tty->print("synchronized ");
338 if (is_native()) tty->print("native ");
339 method_holder()->name()->print_symbol_on(tty);
340 tty->print(".");
341 name()->print_symbol_on(tty);
342 signature()->print_symbol_on(tty);
344 if (WizardMode) {
345 // dump the size of the byte codes
346 tty->print(" {%d}", code_size());
347 }
348 tty->cr();
350 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
351 tty->print_cr (" invocation_counter: %8d ", invocation_count());
352 tty->print_cr (" backedge_counter: %8d ", backedge_count());
353 if (CountCompiledCalls) {
354 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
355 }
357 }
358 #endif
360 // Build a MethodData* object to hold information about this method
361 // collected in the interpreter.
362 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
363 // Do not profile method if current thread holds the pending list lock,
364 // which avoids deadlock for acquiring the MethodData_lock.
365 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
366 return;
367 }
369 // Grab a lock here to prevent multiple
370 // MethodData*s from being created.
371 MutexLocker ml(MethodData_lock, THREAD);
372 if (method->method_data() == NULL) {
373 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
374 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);
375 method->set_method_data(method_data);
376 if (PrintMethodData && (Verbose || WizardMode)) {
377 ResourceMark rm(THREAD);
378 tty->print("build_interpreter_method_data for ");
379 method->print_name(tty);
380 tty->cr();
381 // At the end of the run, the MDO, full of data, will be dumped.
382 }
383 }
384 }
386 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
387 methodHandle mh(m);
388 ClassLoaderData* loader_data = mh->method_holder()->class_loader_data();
389 MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL);
390 if (mh->method_counters() == NULL) {
391 mh->set_method_counters(counters);
392 } else {
393 MetadataFactory::free_metadata(loader_data, counters);
394 }
395 return mh->method_counters();
396 }
398 void Method::cleanup_inline_caches() {
399 // The current system doesn't use inline caches in the interpreter
400 // => nothing to do (keep this method around for future use)
401 }
404 int Method::extra_stack_words() {
405 // not an inline function, to avoid a header dependency on Interpreter
406 return extra_stack_entries() * Interpreter::stackElementSize;
407 }
410 void Method::compute_size_of_parameters(Thread *thread) {
411 ArgumentSizeComputer asc(signature());
412 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
413 }
415 #ifdef CC_INTERP
416 void Method::set_result_index(BasicType type) {
417 _result_index = Interpreter::BasicType_as_index(type);
418 }
419 #endif
421 BasicType Method::result_type() const {
422 ResultTypeFinder rtf(signature());
423 return rtf.type();
424 }
427 bool Method::is_empty_method() const {
428 return code_size() == 1
429 && *code_base() == Bytecodes::_return;
430 }
433 bool Method::is_vanilla_constructor() const {
434 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
435 // which only calls the superclass vanilla constructor and possibly does stores of
436 // zero constants to local fields:
437 //
438 // aload_0
439 // invokespecial
440 // indexbyte1
441 // indexbyte2
442 //
443 // followed by an (optional) sequence of:
444 //
445 // aload_0
446 // aconst_null / iconst_0 / fconst_0 / dconst_0
447 // putfield
448 // indexbyte1
449 // indexbyte2
450 //
451 // followed by:
452 //
453 // return
455 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
456 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
457 int size = code_size();
458 // Check if size match
459 if (size == 0 || size % 5 != 0) return false;
460 address cb = code_base();
461 int last = size - 1;
462 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
463 // Does not call superclass default constructor
464 return false;
465 }
466 // Check optional sequence
467 for (int i = 4; i < last; i += 5) {
468 if (cb[i] != Bytecodes::_aload_0) return false;
469 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
470 if (cb[i+2] != Bytecodes::_putfield) return false;
471 }
472 return true;
473 }
476 bool Method::compute_has_loops_flag() {
477 BytecodeStream bcs(this);
478 Bytecodes::Code bc;
480 while ((bc = bcs.next()) >= 0) {
481 switch( bc ) {
482 case Bytecodes::_ifeq:
483 case Bytecodes::_ifnull:
484 case Bytecodes::_iflt:
485 case Bytecodes::_ifle:
486 case Bytecodes::_ifne:
487 case Bytecodes::_ifnonnull:
488 case Bytecodes::_ifgt:
489 case Bytecodes::_ifge:
490 case Bytecodes::_if_icmpeq:
491 case Bytecodes::_if_icmpne:
492 case Bytecodes::_if_icmplt:
493 case Bytecodes::_if_icmpgt:
494 case Bytecodes::_if_icmple:
495 case Bytecodes::_if_icmpge:
496 case Bytecodes::_if_acmpeq:
497 case Bytecodes::_if_acmpne:
498 case Bytecodes::_goto:
499 case Bytecodes::_jsr:
500 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
501 break;
503 case Bytecodes::_goto_w:
504 case Bytecodes::_jsr_w:
505 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
506 break;
507 }
508 }
509 _access_flags.set_loops_flag_init();
510 return _access_flags.has_loops();
511 }
513 bool Method::is_final_method(AccessFlags class_access_flags) const {
514 // or "does_not_require_vtable_entry"
515 // default method or overpass can occur, is not final (reuses vtable entry)
516 // private methods get vtable entries for backward class compatibility.
517 if (is_overpass() || is_default_method()) return false;
518 return is_final() || class_access_flags.is_final();
519 }
521 bool Method::is_final_method() const {
522 return is_final_method(method_holder()->access_flags());
523 }
525 bool Method::is_default_method() const {
526 if (method_holder() != NULL &&
527 method_holder()->is_interface() &&
528 !is_abstract()) {
529 return true;
530 } else {
531 return false;
532 }
533 }
535 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
536 if (is_final_method(class_access_flags)) return true;
537 #ifdef ASSERT
538 ResourceMark rm;
539 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
540 if (class_access_flags.is_interface()) {
541 assert(is_nonv == is_static(), err_msg("is_nonv=%s", name_and_sig_as_C_string()));
542 }
543 #endif
544 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
545 return vtable_index() == nonvirtual_vtable_index;
546 }
548 bool Method::can_be_statically_bound() const {
549 return can_be_statically_bound(method_holder()->access_flags());
550 }
552 bool Method::is_accessor() const {
553 if (code_size() != 5) return false;
554 if (size_of_parameters() != 1) return false;
555 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
556 if (java_code_at(1) != Bytecodes::_getfield) return false;
557 if (java_code_at(4) != Bytecodes::_areturn &&
558 java_code_at(4) != Bytecodes::_ireturn ) return false;
559 return true;
560 }
563 bool Method::is_initializer() const {
564 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
565 }
567 bool Method::has_valid_initializer_flags() const {
568 return (is_static() ||
569 method_holder()->major_version() < 51);
570 }
572 bool Method::is_static_initializer() const {
573 // For classfiles version 51 or greater, ensure that the clinit method is
574 // static. Non-static methods with the name "<clinit>" are not static
575 // initializers. (older classfiles exempted for backward compatibility)
576 return name() == vmSymbols::class_initializer_name() &&
577 has_valid_initializer_flags();
578 }
581 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) {
582 int length = this_oop->checked_exceptions_length();
583 if (length == 0) { // common case
584 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
585 } else {
586 methodHandle h_this(THREAD, this_oop);
587 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
588 objArrayHandle mirrors (THREAD, m_oop);
589 for (int i = 0; i < length; i++) {
590 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
591 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
592 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
593 mirrors->obj_at_put(i, k->java_mirror());
594 }
595 return mirrors;
596 }
597 };
600 int Method::line_number_from_bci(int bci) const {
601 if (bci == SynchronizationEntryBCI) bci = 0;
602 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
603 int best_bci = 0;
604 int best_line = -1;
606 if (has_linenumber_table()) {
607 // The line numbers are a short array of 2-tuples [start_pc, line_number].
608 // Not necessarily sorted and not necessarily one-to-one.
609 CompressedLineNumberReadStream stream(compressed_linenumber_table());
610 while (stream.read_pair()) {
611 if (stream.bci() == bci) {
612 // perfect match
613 return stream.line();
614 } else {
615 // update best_bci/line
616 if (stream.bci() < bci && stream.bci() >= best_bci) {
617 best_bci = stream.bci();
618 best_line = stream.line();
619 }
620 }
621 }
622 }
623 return best_line;
624 }
627 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
628 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
629 Thread *thread = Thread::current();
630 Symbol* klass_name = constants()->klass_name_at(klass_index);
631 Handle loader(thread, method_holder()->class_loader());
632 Handle prot (thread, method_holder()->protection_domain());
633 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
634 } else {
635 return true;
636 }
637 }
640 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
641 int klass_index = constants()->klass_ref_index_at(refinfo_index);
642 if (must_be_resolved) {
643 // Make sure klass is resolved in constantpool.
644 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
645 }
646 return is_klass_loaded_by_klass_index(klass_index);
647 }
650 void Method::set_native_function(address function, bool post_event_flag) {
651 assert(function != NULL, "use clear_native_function to unregister natives");
652 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
653 address* native_function = native_function_addr();
655 // We can see racers trying to place the same native function into place. Once
656 // is plenty.
657 address current = *native_function;
658 if (current == function) return;
659 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
660 function != NULL) {
661 // native_method_throw_unsatisfied_link_error_entry() should only
662 // be passed when post_event_flag is false.
663 assert(function !=
664 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
665 "post_event_flag mis-match");
667 // post the bind event, and possible change the bind function
668 JvmtiExport::post_native_method_bind(this, &function);
669 }
670 *native_function = function;
671 // This function can be called more than once. We must make sure that we always
672 // use the latest registered method -> check if a stub already has been generated.
673 // If so, we have to make it not_entrant.
674 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
675 if (nm != NULL) {
676 nm->make_not_entrant();
677 }
678 }
681 bool Method::has_native_function() const {
682 if (is_method_handle_intrinsic())
683 return false; // special-cased in SharedRuntime::generate_native_wrapper
684 address func = native_function();
685 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
686 }
689 void Method::clear_native_function() {
690 // Note: is_method_handle_intrinsic() is allowed here.
691 set_native_function(
692 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
693 !native_bind_event_is_interesting);
694 clear_code();
695 }
697 address Method::critical_native_function() {
698 methodHandle mh(this);
699 return NativeLookup::lookup_critical_entry(mh);
700 }
703 void Method::set_signature_handler(address handler) {
704 address* signature_handler = signature_handler_addr();
705 *signature_handler = handler;
706 }
709 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
710 if (PrintCompilation && report) {
711 ttyLocker ttyl;
712 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
713 if (comp_level == CompLevel_all) {
714 tty->print("all levels ");
715 } else {
716 tty->print("levels ");
717 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
718 tty->print("%d ", i);
719 }
720 }
721 this->print_short_name(tty);
722 int size = this->code_size();
723 if (size > 0) {
724 tty->print(" (%d bytes)", size);
725 }
726 if (reason != NULL) {
727 tty->print(" %s", reason);
728 }
729 tty->cr();
730 }
731 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
732 ttyLocker ttyl;
733 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'",
734 is_osr ? "osr_" : "", os::current_thread_id());
735 if (reason != NULL) {
736 xtty->print(" reason=\'%s\'", reason);
737 }
738 xtty->method(this);
739 xtty->stamp();
740 xtty->end_elem();
741 }
742 }
744 bool Method::is_always_compilable() const {
745 // Generated adapters must be compiled
746 if (is_method_handle_intrinsic() && is_synthetic()) {
747 assert(!is_not_c1_compilable(), "sanity check");
748 assert(!is_not_c2_compilable(), "sanity check");
749 return true;
750 }
752 return false;
753 }
755 bool Method::is_not_compilable(int comp_level) const {
756 if (number_of_breakpoints() > 0)
757 return true;
758 if (is_always_compilable())
759 return false;
760 if (comp_level == CompLevel_any)
761 return is_not_c1_compilable() || is_not_c2_compilable();
762 if (is_c1_compile(comp_level))
763 return is_not_c1_compilable();
764 if (is_c2_compile(comp_level))
765 return is_not_c2_compilable();
766 return false;
767 }
769 // call this when compiler finds that this method is not compilable
770 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
771 if (is_always_compilable()) {
772 // Don't mark a method which should be always compilable
773 return;
774 }
775 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
776 if (comp_level == CompLevel_all) {
777 set_not_c1_compilable();
778 set_not_c2_compilable();
779 } else {
780 if (is_c1_compile(comp_level))
781 set_not_c1_compilable();
782 if (is_c2_compile(comp_level))
783 set_not_c2_compilable();
784 }
785 CompilationPolicy::policy()->disable_compilation(this);
786 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
787 }
789 bool Method::is_not_osr_compilable(int comp_level) const {
790 if (is_not_compilable(comp_level))
791 return true;
792 if (comp_level == CompLevel_any)
793 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
794 if (is_c1_compile(comp_level))
795 return is_not_c1_osr_compilable();
796 if (is_c2_compile(comp_level))
797 return is_not_c2_osr_compilable();
798 return false;
799 }
801 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
802 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
803 if (comp_level == CompLevel_all) {
804 set_not_c1_osr_compilable();
805 set_not_c2_osr_compilable();
806 } else {
807 if (is_c1_compile(comp_level))
808 set_not_c1_osr_compilable();
809 if (is_c2_compile(comp_level))
810 set_not_c2_osr_compilable();
811 }
812 CompilationPolicy::policy()->disable_compilation(this);
813 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
814 }
816 // Revert to using the interpreter and clear out the nmethod
817 void Method::clear_code() {
819 // this may be NULL if c2i adapters have not been made yet
820 // Only should happen at allocate time.
821 if (_adapter == NULL) {
822 _from_compiled_entry = NULL;
823 } else {
824 _from_compiled_entry = _adapter->get_c2i_entry();
825 }
826 OrderAccess::storestore();
827 _from_interpreted_entry = _i2i_entry;
828 OrderAccess::storestore();
829 _code = NULL;
830 }
832 // Called by class data sharing to remove any entry points (which are not shared)
833 void Method::unlink_method() {
834 _code = NULL;
835 _i2i_entry = NULL;
836 _from_interpreted_entry = NULL;
837 if (is_native()) {
838 *native_function_addr() = NULL;
839 set_signature_handler(NULL);
840 }
841 NOT_PRODUCT(set_compiled_invocation_count(0);)
842 _adapter = NULL;
843 _from_compiled_entry = NULL;
845 // In case of DumpSharedSpaces, _method_data should always be NULL.
846 //
847 // During runtime (!DumpSharedSpaces), when we are cleaning a
848 // shared class that failed to load, this->link_method() may
849 // have already been called (before an exception happened), so
850 // this->_method_data may not be NULL.
851 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?");
853 set_method_data(NULL);
854 set_method_counters(NULL);
855 }
857 // Called when the method_holder is getting linked. Setup entrypoints so the method
858 // is ready to be called from interpreter, compiler, and vtables.
859 void Method::link_method(methodHandle h_method, TRAPS) {
860 // If the code cache is full, we may reenter this function for the
861 // leftover methods that weren't linked.
862 if (_i2i_entry != NULL) return;
864 assert(_adapter == NULL, "init'd to NULL" );
865 assert( _code == NULL, "nothing compiled yet" );
867 // Setup interpreter entrypoint
868 assert(this == h_method(), "wrong h_method()" );
869 address entry = Interpreter::entry_for_method(h_method);
870 assert(entry != NULL, "interpreter entry must be non-null");
871 // Sets both _i2i_entry and _from_interpreted_entry
872 set_interpreter_entry(entry);
874 // Don't overwrite already registered native entries.
875 if (is_native() && !has_native_function()) {
876 set_native_function(
877 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
878 !native_bind_event_is_interesting);
879 }
881 // Setup compiler entrypoint. This is made eagerly, so we do not need
882 // special handling of vtables. An alternative is to make adapters more
883 // lazily by calling make_adapter() from from_compiled_entry() for the
884 // normal calls. For vtable calls life gets more complicated. When a
885 // call-site goes mega-morphic we need adapters in all methods which can be
886 // called from the vtable. We need adapters on such methods that get loaded
887 // later. Ditto for mega-morphic itable calls. If this proves to be a
888 // problem we'll make these lazily later.
889 (void) make_adapters(h_method, CHECK);
891 // ONLY USE the h_method now as make_adapter may have blocked
893 }
895 address Method::make_adapters(methodHandle mh, TRAPS) {
896 // Adapters for compiled code are made eagerly here. They are fairly
897 // small (generally < 100 bytes) and quick to make (and cached and shared)
898 // so making them eagerly shouldn't be too expensive.
899 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
900 if (adapter == NULL ) {
901 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
902 }
904 mh->set_adapter_entry(adapter);
905 mh->_from_compiled_entry = adapter->get_c2i_entry();
906 return adapter->get_c2i_entry();
907 }
909 void Method::restore_unshareable_info(TRAPS) {
910 // Since restore_unshareable_info can be called more than once for a method, don't
911 // redo any work. If this field is restored, there is nothing to do.
912 if (_from_compiled_entry == NULL) {
913 // restore method's vtable by calling a virtual function
914 restore_vtable();
916 methodHandle mh(THREAD, this);
917 link_method(mh, CHECK);
918 }
919 }
922 // The verified_code_entry() must be called when a invoke is resolved
923 // on this method.
925 // It returns the compiled code entry point, after asserting not null.
926 // This function is called after potential safepoints so that nmethod
927 // or adapter that it points to is still live and valid.
928 // This function must not hit a safepoint!
929 address Method::verified_code_entry() {
930 debug_only(No_Safepoint_Verifier nsv;)
931 assert(_from_compiled_entry != NULL, "must be set");
932 return _from_compiled_entry;
933 }
935 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
936 // (could be racing a deopt).
937 // Not inline to avoid circular ref.
938 bool Method::check_code() const {
939 // cached in a register or local. There's a race on the value of the field.
940 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
941 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
942 }
944 // Install compiled code. Instantly it can execute.
945 void Method::set_code(methodHandle mh, nmethod *code) {
946 assert( code, "use clear_code to remove code" );
947 assert( mh->check_code(), "" );
949 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
951 // These writes must happen in this order, because the interpreter will
952 // directly jump to from_interpreted_entry which jumps to an i2c adapter
953 // which jumps to _from_compiled_entry.
954 mh->_code = code; // Assign before allowing compiled code to exec
956 int comp_level = code->comp_level();
957 // In theory there could be a race here. In practice it is unlikely
958 // and not worth worrying about.
959 if (comp_level > mh->highest_comp_level()) {
960 mh->set_highest_comp_level(comp_level);
961 }
963 OrderAccess::storestore();
964 #ifdef SHARK
965 mh->_from_interpreted_entry = code->insts_begin();
966 #else //!SHARK
967 mh->_from_compiled_entry = code->verified_entry_point();
968 OrderAccess::storestore();
969 // Instantly compiled code can execute.
970 if (!mh->is_method_handle_intrinsic())
971 mh->_from_interpreted_entry = mh->get_i2c_entry();
972 #endif //!SHARK
973 }
976 bool Method::is_overridden_in(Klass* k) const {
977 InstanceKlass* ik = InstanceKlass::cast(k);
979 if (ik->is_interface()) return false;
981 // If method is an interface, we skip it - except if it
982 // is a miranda method
983 if (method_holder()->is_interface()) {
984 // Check that method is not a miranda method
985 if (ik->lookup_method(name(), signature()) == NULL) {
986 // No implementation exist - so miranda method
987 return false;
988 }
989 return true;
990 }
992 assert(ik->is_subclass_of(method_holder()), "should be subklass");
993 assert(ik->vtable() != NULL, "vtable should exist");
994 if (!has_vtable_index()) {
995 return false;
996 } else {
997 Method* vt_m = ik->method_at_vtable(vtable_index());
998 return vt_m != this;
999 }
1000 }
1003 // give advice about whether this Method* should be cached or not
1004 bool Method::should_not_be_cached() const {
1005 if (is_old()) {
1006 // This method has been redefined. It is either EMCP or obsolete
1007 // and we don't want to cache it because that would pin the method
1008 // down and prevent it from being collectible if and when it
1009 // finishes executing.
1010 return true;
1011 }
1013 // caching this method should be just fine
1014 return false;
1015 }
1018 /**
1019 * Returns true if this is one of the specially treated methods for
1020 * security related stack walks (like Reflection.getCallerClass).
1021 */
1022 bool Method::is_ignored_by_security_stack_walk() const {
1023 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection;
1025 if (intrinsic_id() == vmIntrinsics::_invoke) {
1026 // This is Method.invoke() -- ignore it
1027 return true;
1028 }
1029 if (use_new_reflection &&
1030 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1031 // This is an auxilary frame -- ignore it
1032 return true;
1033 }
1034 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1035 // This is an internal adapter frame for method handles -- ignore it
1036 return true;
1037 }
1038 return false;
1039 }
1042 // Constant pool structure for invoke methods:
1043 enum {
1044 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1045 _imcp_invoke_signature, // utf8: (variable Symbol*)
1046 _imcp_limit
1047 };
1049 // Test if this method is an MH adapter frame generated by Java code.
1050 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1051 bool Method::is_compiled_lambda_form() const {
1052 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1053 }
1055 // Test if this method is an internal MH primitive method.
1056 bool Method::is_method_handle_intrinsic() const {
1057 vmIntrinsics::ID iid = intrinsic_id();
1058 return (MethodHandles::is_signature_polymorphic(iid) &&
1059 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1060 }
1062 bool Method::has_member_arg() const {
1063 vmIntrinsics::ID iid = intrinsic_id();
1064 return (MethodHandles::is_signature_polymorphic(iid) &&
1065 MethodHandles::has_member_arg(iid));
1066 }
1068 // Make an instance of a signature-polymorphic internal MH primitive.
1069 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1070 Symbol* signature,
1071 TRAPS) {
1072 ResourceMark rm;
1073 methodHandle empty;
1075 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1076 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1077 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1078 if (TraceMethodHandles) {
1079 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1080 }
1082 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1083 name->increment_refcount();
1084 signature->increment_refcount();
1086 int cp_length = _imcp_limit;
1087 ClassLoaderData* loader_data = holder->class_loader_data();
1088 constantPoolHandle cp;
1089 {
1090 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1091 cp = constantPoolHandle(THREAD, cp_oop);
1092 }
1093 cp->set_pool_holder(InstanceKlass::cast(holder()));
1094 cp->symbol_at_put(_imcp_invoke_name, name);
1095 cp->symbol_at_put(_imcp_invoke_signature, signature);
1096 cp->set_has_preresolution();
1098 // decide on access bits: public or not?
1099 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1100 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1101 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1102 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1104 methodHandle m;
1105 {
1106 InlineTableSizes sizes;
1107 Method* m_oop = Method::allocate(loader_data, 0,
1108 accessFlags_from(flags_bits), &sizes,
1109 ConstMethod::NORMAL, CHECK_(empty));
1110 m = methodHandle(THREAD, m_oop);
1111 }
1112 m->set_constants(cp());
1113 m->set_name_index(_imcp_invoke_name);
1114 m->set_signature_index(_imcp_invoke_signature);
1115 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1116 assert(m->signature() == signature, "");
1117 #ifdef CC_INTERP
1118 ResultTypeFinder rtf(signature);
1119 m->set_result_index(rtf.type());
1120 #endif
1121 m->compute_size_of_parameters(THREAD);
1122 m->init_intrinsic_id();
1123 assert(m->is_method_handle_intrinsic(), "");
1124 #ifdef ASSERT
1125 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1126 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1127 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1128 #endif //ASSERT
1130 // Finally, set up its entry points.
1131 assert(m->can_be_statically_bound(), "");
1132 m->set_vtable_index(Method::nonvirtual_vtable_index);
1133 m->link_method(m, CHECK_(empty));
1135 if (TraceMethodHandles && (Verbose || WizardMode))
1136 m->print_on(tty);
1138 return m;
1139 }
1141 Klass* Method::check_non_bcp_klass(Klass* klass) {
1142 if (klass != NULL && klass->class_loader() != NULL) {
1143 if (klass->oop_is_objArray())
1144 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1145 return klass;
1146 }
1147 return NULL;
1148 }
1151 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1152 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1153 // Code below does not work for native methods - they should never get rewritten anyway
1154 assert(!m->is_native(), "cannot rewrite native methods");
1155 // Allocate new Method*
1156 AccessFlags flags = m->access_flags();
1158 ConstMethod* cm = m->constMethod();
1159 int checked_exceptions_len = cm->checked_exceptions_length();
1160 int localvariable_len = cm->localvariable_table_length();
1161 int exception_table_len = cm->exception_table_length();
1162 int method_parameters_len = cm->method_parameters_length();
1163 int method_annotations_len = cm->method_annotations_length();
1164 int parameter_annotations_len = cm->parameter_annotations_length();
1165 int type_annotations_len = cm->type_annotations_length();
1166 int default_annotations_len = cm->default_annotations_length();
1168 InlineTableSizes sizes(
1169 localvariable_len,
1170 new_compressed_linenumber_size,
1171 exception_table_len,
1172 checked_exceptions_len,
1173 method_parameters_len,
1174 cm->generic_signature_index(),
1175 method_annotations_len,
1176 parameter_annotations_len,
1177 type_annotations_len,
1178 default_annotations_len,
1179 0);
1181 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1182 Method* newm_oop = Method::allocate(loader_data,
1183 new_code_length,
1184 flags,
1185 &sizes,
1186 m->method_type(),
1187 CHECK_(methodHandle()));
1188 methodHandle newm (THREAD, newm_oop);
1189 int new_method_size = newm->method_size();
1191 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1192 ConstMethod* newcm = newm->constMethod();
1193 int new_const_method_size = newm->constMethod()->size();
1195 memcpy(newm(), m(), sizeof(Method));
1197 // Create shallow copy of ConstMethod.
1198 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1200 // Reset correct method/const method, method size, and parameter info
1201 newm->set_constMethod(newcm);
1202 newm->constMethod()->set_code_size(new_code_length);
1203 newm->constMethod()->set_constMethod_size(new_const_method_size);
1204 newm->set_method_size(new_method_size);
1205 assert(newm->code_size() == new_code_length, "check");
1206 assert(newm->method_parameters_length() == method_parameters_len, "check");
1207 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1208 assert(newm->exception_table_length() == exception_table_len, "check");
1209 assert(newm->localvariable_table_length() == localvariable_len, "check");
1210 // Copy new byte codes
1211 memcpy(newm->code_base(), new_code, new_code_length);
1212 // Copy line number table
1213 if (new_compressed_linenumber_size > 0) {
1214 memcpy(newm->compressed_linenumber_table(),
1215 new_compressed_linenumber_table,
1216 new_compressed_linenumber_size);
1217 }
1218 // Copy method_parameters
1219 if (method_parameters_len > 0) {
1220 memcpy(newm->method_parameters_start(),
1221 m->method_parameters_start(),
1222 method_parameters_len * sizeof(MethodParametersElement));
1223 }
1224 // Copy checked_exceptions
1225 if (checked_exceptions_len > 0) {
1226 memcpy(newm->checked_exceptions_start(),
1227 m->checked_exceptions_start(),
1228 checked_exceptions_len * sizeof(CheckedExceptionElement));
1229 }
1230 // Copy exception table
1231 if (exception_table_len > 0) {
1232 memcpy(newm->exception_table_start(),
1233 m->exception_table_start(),
1234 exception_table_len * sizeof(ExceptionTableElement));
1235 }
1236 // Copy local variable number table
1237 if (localvariable_len > 0) {
1238 memcpy(newm->localvariable_table_start(),
1239 m->localvariable_table_start(),
1240 localvariable_len * sizeof(LocalVariableTableElement));
1241 }
1242 // Copy stackmap table
1243 if (m->has_stackmap_table()) {
1244 int code_attribute_length = m->stackmap_data()->length();
1245 Array<u1>* stackmap_data =
1246 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1247 memcpy((void*)stackmap_data->adr_at(0),
1248 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1249 newm->set_stackmap_data(stackmap_data);
1250 }
1252 // copy annotations over to new method
1253 newcm->copy_annotations_from(cm);
1254 return newm;
1255 }
1257 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1258 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1259 // because we are not loading from core libraries
1260 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1261 // which does not use the class default class loader so we check for its loader here
1262 InstanceKlass* ik = InstanceKlass::cast(holder);
1263 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) {
1264 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1265 }
1267 // see if the klass name is well-known:
1268 Symbol* klass_name = ik->name();
1269 return vmSymbols::find_sid(klass_name);
1270 }
1272 void Method::init_intrinsic_id() {
1273 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1274 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1275 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1276 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1278 // the klass name is well-known:
1279 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1280 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1282 // ditto for method and signature:
1283 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1284 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1285 && name_id == vmSymbols::NO_SID)
1286 return;
1287 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1288 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1289 && sig_id == vmSymbols::NO_SID) return;
1290 jshort flags = access_flags().as_short();
1292 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1293 if (id != vmIntrinsics::_none) {
1294 set_intrinsic_id(id);
1295 return;
1296 }
1298 // A few slightly irregular cases:
1299 switch (klass_id) {
1300 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1301 // Second chance: check in regular Math.
1302 switch (name_id) {
1303 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1304 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1305 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1306 // pretend it is the corresponding method in the non-strict class:
1307 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1308 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1309 break;
1310 }
1311 break;
1313 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1314 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1315 if (!is_native()) break;
1316 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1317 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1318 id = vmIntrinsics::_none;
1319 break;
1320 }
1322 if (id != vmIntrinsics::_none) {
1323 // Set up its iid. It is an alias method.
1324 set_intrinsic_id(id);
1325 return;
1326 }
1327 }
1329 // These two methods are static since a GC may move the Method
1330 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1331 if (THREAD->is_Compiler_thread()) {
1332 // There is nothing useful this routine can do from within the Compile thread.
1333 // Hopefully, the signature contains only well-known classes.
1334 // We could scan for this and return true/false, but the caller won't care.
1335 return false;
1336 }
1337 bool sig_is_loaded = true;
1338 Handle class_loader(THREAD, m->method_holder()->class_loader());
1339 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1340 ResourceMark rm(THREAD);
1341 Symbol* signature = m->signature();
1342 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1343 if (ss.is_object()) {
1344 Symbol* sym = ss.as_symbol(CHECK_(false));
1345 Symbol* name = sym;
1346 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1347 protection_domain, THREAD);
1348 // We are loading classes eagerly. If a ClassNotFoundException or
1349 // a LinkageError was generated, be sure to ignore it.
1350 if (HAS_PENDING_EXCEPTION) {
1351 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1352 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1353 CLEAR_PENDING_EXCEPTION;
1354 } else {
1355 return false;
1356 }
1357 }
1358 if( klass == NULL) { sig_is_loaded = false; }
1359 }
1360 }
1361 return sig_is_loaded;
1362 }
1364 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1365 Handle class_loader(THREAD, m->method_holder()->class_loader());
1366 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1367 ResourceMark rm(THREAD);
1368 Symbol* signature = m->signature();
1369 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1370 if (ss.type() == T_OBJECT) {
1371 Symbol* name = ss.as_symbol_or_null();
1372 if (name == NULL) return true;
1373 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1374 if (klass == NULL) return true;
1375 }
1376 }
1377 return false;
1378 }
1380 // Exposed so field engineers can debug VM
1381 void Method::print_short_name(outputStream* st) {
1382 ResourceMark rm;
1383 #ifdef PRODUCT
1384 st->print(" %s::", method_holder()->external_name());
1385 #else
1386 st->print(" %s::", method_holder()->internal_name());
1387 #endif
1388 name()->print_symbol_on(st);
1389 if (WizardMode) signature()->print_symbol_on(st);
1390 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1391 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1392 }
1394 // Comparer for sorting an object array containing
1395 // Method*s.
1396 static int method_comparator(Method* a, Method* b) {
1397 return a->name()->fast_compare(b->name());
1398 }
1400 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1401 // default_methods also uses this without the ordering for fast find_method
1402 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1403 int length = methods->length();
1404 if (length > 1) {
1405 {
1406 No_Safepoint_Verifier nsv;
1407 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1408 }
1409 // Reset method ordering
1410 if (set_idnums) {
1411 for (int i = 0; i < length; i++) {
1412 Method* m = methods->at(i);
1413 m->set_method_idnum(i);
1414 }
1415 }
1416 }
1417 }
1419 //-----------------------------------------------------------------------------------
1420 // Non-product code unless JVM/TI needs it
1422 #if !defined(PRODUCT) || INCLUDE_JVMTI
1423 class SignatureTypePrinter : public SignatureTypeNames {
1424 private:
1425 outputStream* _st;
1426 bool _use_separator;
1428 void type_name(const char* name) {
1429 if (_use_separator) _st->print(", ");
1430 _st->print("%s", name);
1431 _use_separator = true;
1432 }
1434 public:
1435 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1436 _st = st;
1437 _use_separator = false;
1438 }
1440 void print_parameters() { _use_separator = false; iterate_parameters(); }
1441 void print_returntype() { _use_separator = false; iterate_returntype(); }
1442 };
1445 void Method::print_name(outputStream* st) {
1446 Thread *thread = Thread::current();
1447 ResourceMark rm(thread);
1448 SignatureTypePrinter sig(signature(), st);
1449 st->print("%s ", is_static() ? "static" : "virtual");
1450 sig.print_returntype();
1451 st->print(" %s.", method_holder()->internal_name());
1452 name()->print_symbol_on(st);
1453 st->print("(");
1454 sig.print_parameters();
1455 st->print(")");
1456 }
1457 #endif // !PRODUCT || INCLUDE_JVMTI
1460 //-----------------------------------------------------------------------------------
1461 // Non-product code
1463 #ifndef PRODUCT
1464 void Method::print_codes_on(outputStream* st) const {
1465 print_codes_on(0, code_size(), st);
1466 }
1468 void Method::print_codes_on(int from, int to, outputStream* st) const {
1469 Thread *thread = Thread::current();
1470 ResourceMark rm(thread);
1471 methodHandle mh (thread, (Method*)this);
1472 BytecodeStream s(mh);
1473 s.set_interval(from, to);
1474 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1475 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1476 }
1477 #endif // not PRODUCT
1480 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1481 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1482 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1483 // as end-of-stream terminator.
1485 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1486 // bci and line number does not compress into single byte.
1487 // Write out escape character and use regular compression for bci and line number.
1488 write_byte((jubyte)0xFF);
1489 write_signed_int(bci_delta);
1490 write_signed_int(line_delta);
1491 }
1493 // See comment in method.hpp which explains why this exists.
1494 #if defined(_M_AMD64) && _MSC_VER >= 1400
1495 #pragma optimize("", off)
1496 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1497 write_pair_inline(bci, line);
1498 }
1499 #pragma optimize("", on)
1500 #endif
1502 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1503 _bci = 0;
1504 _line = 0;
1505 };
1508 bool CompressedLineNumberReadStream::read_pair() {
1509 jubyte next = read_byte();
1510 // Check for terminator
1511 if (next == 0) return false;
1512 if (next == 0xFF) {
1513 // Escape character, regular compression used
1514 _bci += read_signed_int();
1515 _line += read_signed_int();
1516 } else {
1517 // Single byte compression used
1518 _bci += next >> 3;
1519 _line += next & 0x7;
1520 }
1521 return true;
1522 }
1525 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1526 BreakpointInfo* bp = method_holder()->breakpoints();
1527 for (; bp != NULL; bp = bp->next()) {
1528 if (bp->match(this, bci)) {
1529 return bp->orig_bytecode();
1530 }
1531 }
1532 {
1533 ResourceMark rm;
1534 fatal(err_msg("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci));
1535 }
1536 return Bytecodes::_shouldnotreachhere;
1537 }
1539 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1540 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1541 BreakpointInfo* bp = method_holder()->breakpoints();
1542 for (; bp != NULL; bp = bp->next()) {
1543 if (bp->match(this, bci)) {
1544 bp->set_orig_bytecode(code);
1545 // and continue, in case there is more than one
1546 }
1547 }
1548 }
1550 void Method::set_breakpoint(int bci) {
1551 InstanceKlass* ik = method_holder();
1552 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1553 bp->set_next(ik->breakpoints());
1554 ik->set_breakpoints(bp);
1555 // do this last:
1556 bp->set(this);
1557 }
1559 static void clear_matches(Method* m, int bci) {
1560 InstanceKlass* ik = m->method_holder();
1561 BreakpointInfo* prev_bp = NULL;
1562 BreakpointInfo* next_bp;
1563 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1564 next_bp = bp->next();
1565 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1566 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1567 // do this first:
1568 bp->clear(m);
1569 // unhook it
1570 if (prev_bp != NULL)
1571 prev_bp->set_next(next_bp);
1572 else
1573 ik->set_breakpoints(next_bp);
1574 delete bp;
1575 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1576 // at same location. So we have multiple matching (method_index and bci)
1577 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1578 // breakpoint for clear_breakpoint request and keep all other method versions
1579 // BreakpointInfo for future clear_breakpoint request.
1580 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1581 // which is being called when class is unloaded. We delete all the Breakpoint
1582 // information for all versions of method. We may not correctly restore the original
1583 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1584 // so these methods won't be used anymore.
1585 if (bci >= 0) {
1586 break;
1587 }
1588 } else {
1589 // This one is a keeper.
1590 prev_bp = bp;
1591 }
1592 }
1593 }
1595 void Method::clear_breakpoint(int bci) {
1596 assert(bci >= 0, "");
1597 clear_matches(this, bci);
1598 }
1600 void Method::clear_all_breakpoints() {
1601 clear_matches(this, -1);
1602 }
1605 int Method::invocation_count() {
1606 MethodCounters *mcs = method_counters();
1607 if (TieredCompilation) {
1608 MethodData* const mdo = method_data();
1609 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1610 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1611 return InvocationCounter::count_limit;
1612 } else {
1613 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1614 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1615 }
1616 } else {
1617 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1618 }
1619 }
1621 int Method::backedge_count() {
1622 MethodCounters *mcs = method_counters();
1623 if (TieredCompilation) {
1624 MethodData* const mdo = method_data();
1625 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1626 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1627 return InvocationCounter::count_limit;
1628 } else {
1629 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1630 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1631 }
1632 } else {
1633 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1634 }
1635 }
1637 int Method::highest_comp_level() const {
1638 const MethodData* mdo = method_data();
1639 if (mdo != NULL) {
1640 return mdo->highest_comp_level();
1641 } else {
1642 return CompLevel_none;
1643 }
1644 }
1646 int Method::highest_osr_comp_level() const {
1647 const MethodData* mdo = method_data();
1648 if (mdo != NULL) {
1649 return mdo->highest_osr_comp_level();
1650 } else {
1651 return CompLevel_none;
1652 }
1653 }
1655 void Method::set_highest_comp_level(int level) {
1656 MethodData* mdo = method_data();
1657 if (mdo != NULL) {
1658 mdo->set_highest_comp_level(level);
1659 }
1660 }
1662 void Method::set_highest_osr_comp_level(int level) {
1663 MethodData* mdo = method_data();
1664 if (mdo != NULL) {
1665 mdo->set_highest_osr_comp_level(level);
1666 }
1667 }
1669 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1670 _bci = bci;
1671 _name_index = m->name_index();
1672 _signature_index = m->signature_index();
1673 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1674 if (_orig_bytecode == Bytecodes::_breakpoint)
1675 _orig_bytecode = m->orig_bytecode_at(_bci);
1676 _next = NULL;
1677 }
1679 void BreakpointInfo::set(Method* method) {
1680 #ifdef ASSERT
1681 {
1682 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1683 if (code == Bytecodes::_breakpoint)
1684 code = method->orig_bytecode_at(_bci);
1685 assert(orig_bytecode() == code, "original bytecode must be the same");
1686 }
1687 #endif
1688 Thread *thread = Thread::current();
1689 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1690 method->incr_number_of_breakpoints(thread);
1691 SystemDictionary::notice_modification();
1692 {
1693 // Deoptimize all dependents on this method
1694 HandleMark hm(thread);
1695 methodHandle mh(thread, method);
1696 Universe::flush_dependents_on_method(mh);
1697 }
1698 }
1700 void BreakpointInfo::clear(Method* method) {
1701 *method->bcp_from(_bci) = orig_bytecode();
1702 assert(method->number_of_breakpoints() > 0, "must not go negative");
1703 method->decr_number_of_breakpoints(Thread::current());
1704 }
1706 // jmethodID handling
1708 // This is a block allocating object, sort of like JNIHandleBlock, only a
1709 // lot simpler. There aren't many of these, they aren't long, they are rarely
1710 // deleted and so we can do some suboptimal things.
1711 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1712 // never get rid of it.
1713 // It would be nice to be able to parameterize the number of methods for
1714 // the null_class_loader but then we'd have to turn this and ClassLoaderData
1715 // into templates.
1717 // I feel like this brain dead class should exist somewhere in the STL
1719 class JNIMethodBlock : public CHeapObj<mtClass> {
1720 enum { number_of_methods = 8 };
1722 Method* _methods[number_of_methods];
1723 int _top;
1724 JNIMethodBlock* _next;
1725 public:
1726 static Method* const _free_method;
1728 JNIMethodBlock() : _next(NULL), _top(0) {
1729 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method;
1730 }
1732 Method** add_method(Method* m) {
1733 if (_top < number_of_methods) {
1734 // top points to the next free entry.
1735 int i = _top;
1736 _methods[i] = m;
1737 _top++;
1738 return &_methods[i];
1739 } else if (_top == number_of_methods) {
1740 // if the next free entry ran off the block see if there's a free entry
1741 for (int i = 0; i< number_of_methods; i++) {
1742 if (_methods[i] == _free_method) {
1743 _methods[i] = m;
1744 return &_methods[i];
1745 }
1746 }
1747 // Only check each block once for frees. They're very unlikely.
1748 // Increment top past the end of the block.
1749 _top++;
1750 }
1751 // need to allocate a next block.
1752 if (_next == NULL) {
1753 _next = new JNIMethodBlock();
1754 }
1755 return _next->add_method(m);
1756 }
1758 bool contains(Method** m) {
1759 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1760 for (int i = 0; i< number_of_methods; i++) {
1761 if (&(b->_methods[i]) == m) {
1762 return true;
1763 }
1764 }
1765 }
1766 return false; // not found
1767 }
1769 // Doesn't really destroy it, just marks it as free so it can be reused.
1770 void destroy_method(Method** m) {
1771 #ifdef ASSERT
1772 assert(contains(m), "should be a methodID");
1773 #endif // ASSERT
1774 *m = _free_method;
1775 }
1777 // During class unloading the methods are cleared, which is different
1778 // than freed.
1779 void clear_all_methods() {
1780 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1781 for (int i = 0; i< number_of_methods; i++) {
1782 _methods[i] = NULL;
1783 }
1784 }
1785 }
1786 #ifndef PRODUCT
1787 int count_methods() {
1788 // count all allocated methods
1789 int count = 0;
1790 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1791 for (int i = 0; i< number_of_methods; i++) {
1792 if (_methods[i] != _free_method) count++;
1793 }
1794 }
1795 return count;
1796 }
1797 #endif // PRODUCT
1798 };
1800 // Something that can't be mistaken for an address or a markOop
1801 Method* const JNIMethodBlock::_free_method = (Method*)55;
1803 // Add a method id to the jmethod_ids
1804 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
1805 ClassLoaderData* cld = loader_data;
1807 if (!SafepointSynchronize::is_at_safepoint()) {
1808 // Have to add jmethod_ids() to class loader data thread-safely.
1809 // Also have to add the method to the list safely, which the cld lock
1810 // protects as well.
1811 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1812 if (cld->jmethod_ids() == NULL) {
1813 cld->set_jmethod_ids(new JNIMethodBlock());
1814 }
1815 // jmethodID is a pointer to Method*
1816 return (jmethodID)cld->jmethod_ids()->add_method(m);
1817 } else {
1818 // At safepoint, we are single threaded and can set this.
1819 if (cld->jmethod_ids() == NULL) {
1820 cld->set_jmethod_ids(new JNIMethodBlock());
1821 }
1822 // jmethodID is a pointer to Method*
1823 return (jmethodID)cld->jmethod_ids()->add_method(m);
1824 }
1825 }
1827 // Mark a jmethodID as free. This is called when there is a data race in
1828 // InstanceKlass while creating the jmethodID cache.
1829 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
1830 ClassLoaderData* cld = loader_data;
1831 Method** ptr = (Method**)m;
1832 assert(cld->jmethod_ids() != NULL, "should have method handles");
1833 cld->jmethod_ids()->destroy_method(ptr);
1834 }
1836 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
1837 // Can't assert the method_holder is the same because the new method has the
1838 // scratch method holder.
1839 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
1840 == new_method->method_holder()->class_loader(),
1841 "changing to a different class loader");
1842 // Just change the method in place, jmethodID pointer doesn't change.
1843 *((Method**)jmid) = new_method;
1844 }
1846 bool Method::is_method_id(jmethodID mid) {
1847 Method* m = resolve_jmethod_id(mid);
1848 assert(m != NULL, "should be called with non-null method");
1849 InstanceKlass* ik = m->method_holder();
1850 ClassLoaderData* cld = ik->class_loader_data();
1851 if (cld->jmethod_ids() == NULL) return false;
1852 return (cld->jmethod_ids()->contains((Method**)mid));
1853 }
1855 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
1856 if (mid == NULL) return NULL;
1857 Method* o = resolve_jmethod_id(mid);
1858 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
1859 return NULL;
1860 }
1861 return o;
1862 };
1864 void Method::set_on_stack(const bool value) {
1865 // Set both the method itself and its constant pool. The constant pool
1866 // on stack means some method referring to it is also on the stack.
1867 _access_flags.set_on_stack(value);
1868 constants()->set_on_stack(value);
1869 if (value) MetadataOnStackMark::record(this);
1870 }
1872 // Called when the class loader is unloaded to make all methods weak.
1873 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1874 loader_data->jmethod_ids()->clear_all_methods();
1875 }
1877 bool Method::has_method_vptr(const void* ptr) {
1878 Method m;
1879 // This assumes that the vtbl pointer is the first word of a C++ object.
1880 // This assumption is also in universe.cpp patch_klass_vtble
1881 void* vtbl2 = dereference_vptr((const void*)&m);
1882 void* this_vtbl = dereference_vptr(ptr);
1883 return vtbl2 == this_vtbl;
1884 }
1886 // Check that this pointer is valid by checking that the vtbl pointer matches
1887 bool Method::is_valid_method() const {
1888 if (this == NULL) {
1889 return false;
1890 } else if (!is_metaspace_object()) {
1891 return false;
1892 } else {
1893 return has_method_vptr((const void*)this);
1894 }
1895 }
1897 #ifndef PRODUCT
1898 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1899 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1900 }
1901 #endif // PRODUCT
1904 // Printing
1906 #ifndef PRODUCT
1908 void Method::print_on(outputStream* st) const {
1909 ResourceMark rm;
1910 assert(is_method(), "must be method");
1911 st->print_cr("%s", internal_name());
1912 // get the effect of PrintOopAddress, always, for methods:
1913 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this);
1914 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
1915 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants());
1916 constants()->print_value_on(st); st->cr();
1917 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
1918 st->print (" - name: "); name()->print_value_on(st); st->cr();
1919 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
1920 st->print_cr(" - max stack: %d", max_stack());
1921 st->print_cr(" - max locals: %d", max_locals());
1922 st->print_cr(" - size of params: %d", size_of_parameters());
1923 st->print_cr(" - method size: %d", method_size());
1924 if (intrinsic_id() != vmIntrinsics::_none)
1925 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
1926 if (highest_comp_level() != CompLevel_none)
1927 st->print_cr(" - highest level: %d", highest_comp_level());
1928 st->print_cr(" - vtable index: %d", _vtable_index);
1929 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
1930 st->print( " - adapters: ");
1931 AdapterHandlerEntry* a = ((Method*)this)->adapter();
1932 if (a == NULL)
1933 st->print_cr(INTPTR_FORMAT, a);
1934 else
1935 a->print_adapter_on(st);
1936 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
1937 st->print_cr(" - code size: %d", code_size());
1938 if (code_size() != 0) {
1939 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
1940 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
1941 }
1942 if (method_data() != NULL) {
1943 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
1944 }
1945 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
1946 if (checked_exceptions_length() > 0) {
1947 CheckedExceptionElement* table = checked_exceptions_start();
1948 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
1949 if (Verbose) {
1950 for (int i = 0; i < checked_exceptions_length(); i++) {
1951 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
1952 }
1953 }
1954 }
1955 if (has_linenumber_table()) {
1956 u_char* table = compressed_linenumber_table();
1957 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
1958 if (Verbose) {
1959 CompressedLineNumberReadStream stream(table);
1960 while (stream.read_pair()) {
1961 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
1962 }
1963 }
1964 }
1965 st->print_cr(" - localvar length: %d", localvariable_table_length());
1966 if (localvariable_table_length() > 0) {
1967 LocalVariableTableElement* table = localvariable_table_start();
1968 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
1969 if (Verbose) {
1970 for (int i = 0; i < localvariable_table_length(); i++) {
1971 int bci = table[i].start_bci;
1972 int len = table[i].length;
1973 const char* name = constants()->printable_name_at(table[i].name_cp_index);
1974 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
1975 int slot = table[i].slot;
1976 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
1977 }
1978 }
1979 }
1980 if (code() != NULL) {
1981 st->print (" - compiled code: ");
1982 code()->print_value_on(st);
1983 }
1984 if (is_native()) {
1985 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
1986 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
1987 }
1988 }
1990 #endif //PRODUCT
1992 void Method::print_value_on(outputStream* st) const {
1993 assert(is_method(), "must be method");
1994 st->print("%s", internal_name());
1995 print_address_on(st);
1996 st->print(" ");
1997 name()->print_value_on(st);
1998 st->print(" ");
1999 signature()->print_value_on(st);
2000 st->print(" in ");
2001 method_holder()->print_value_on(st);
2002 if (WizardMode) st->print("#%d", _vtable_index);
2003 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2004 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2005 }
2007 #if INCLUDE_SERVICES
2008 // Size Statistics
2009 void Method::collect_statistics(KlassSizeStats *sz) const {
2010 int mysize = sz->count(this);
2011 sz->_method_bytes += mysize;
2012 sz->_method_all_bytes += mysize;
2013 sz->_rw_bytes += mysize;
2015 if (constMethod()) {
2016 constMethod()->collect_statistics(sz);
2017 }
2018 if (method_data()) {
2019 method_data()->collect_statistics(sz);
2020 }
2021 }
2022 #endif // INCLUDE_SERVICES
2024 // Verification
2026 void Method::verify_on(outputStream* st) {
2027 guarantee(is_method(), "object must be method");
2028 guarantee(constants()->is_constantPool(), "should be constant pool");
2029 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2030 MethodData* md = method_data();
2031 guarantee(md == NULL ||
2032 md->is_methodData(), "should be method data");
2033 }