Mon, 06 Feb 2017 23:36:58 +0300
8153134: Infinite loop in handle_wrong_method in jmod
Summary: Use Patching_lock to synchronize access between set_code() and clear_code().
Reviewed-by: kvn, dlong
1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
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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).
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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.
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23 */
25 #include "precompiled.hpp"
26 #include "classfile/metadataOnStackMark.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "code/debugInfoRec.hpp"
29 #include "gc_interface/collectedHeap.inline.hpp"
30 #include "interpreter/bytecodeStream.hpp"
31 #include "interpreter/bytecodeTracer.hpp"
32 #include "interpreter/bytecodes.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "interpreter/oopMapCache.hpp"
35 #include "memory/gcLocker.hpp"
36 #include "memory/generation.hpp"
37 #include "memory/heapInspection.hpp"
38 #include "memory/metadataFactory.hpp"
39 #include "memory/metaspaceShared.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "oops/constMethod.hpp"
42 #include "oops/methodData.hpp"
43 #include "oops/method.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "oops/symbol.hpp"
46 #include "prims/jvmtiExport.hpp"
47 #include "prims/methodHandles.hpp"
48 #include "prims/nativeLookup.hpp"
49 #include "runtime/arguments.hpp"
50 #include "runtime/compilationPolicy.hpp"
51 #include "runtime/frame.inline.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "runtime/orderAccess.inline.hpp"
54 #include "runtime/relocator.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "runtime/signature.hpp"
57 #include "utilities/quickSort.hpp"
58 #include "utilities/xmlstream.hpp"
60 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
62 // Implementation of Method
64 Method* Method::allocate(ClassLoaderData* loader_data,
65 int byte_code_size,
66 AccessFlags access_flags,
67 InlineTableSizes* sizes,
68 ConstMethod::MethodType method_type,
69 TRAPS) {
70 assert(!access_flags.is_native() || byte_code_size == 0,
71 "native methods should not contain byte codes");
72 ConstMethod* cm = ConstMethod::allocate(loader_data,
73 byte_code_size,
74 sizes,
75 method_type,
76 CHECK_NULL);
78 int size = Method::size(access_flags.is_native());
80 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, size);
81 }
83 Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) {
84 No_Safepoint_Verifier no_safepoint;
85 set_constMethod(xconst);
86 set_access_flags(access_flags);
87 set_method_size(size);
88 set_intrinsic_id(vmIntrinsics::_none);
89 set_jfr_towrite(false);
90 set_force_inline(false);
91 set_hidden(false);
92 set_dont_inline(false);
93 set_has_injected_profile(false);
94 set_method_data(NULL);
95 clear_method_counters();
96 set_vtable_index(Method::garbage_vtable_index);
98 // Fix and bury in Method*
99 set_interpreter_entry(NULL); // sets i2i entry and from_int
100 set_adapter_entry(NULL);
101 clear_code(false /* don't need a lock */); // from_c/from_i get set to c2i/i2i
103 if (access_flags.is_native()) {
104 clear_native_function();
105 set_signature_handler(NULL);
106 }
108 NOT_PRODUCT(set_compiled_invocation_count(0);)
109 }
111 // Release Method*. The nmethod will be gone when we get here because
112 // we've walked the code cache.
113 void Method::deallocate_contents(ClassLoaderData* loader_data) {
114 clear_jmethod_id(loader_data);
115 MetadataFactory::free_metadata(loader_data, constMethod());
116 set_constMethod(NULL);
117 MetadataFactory::free_metadata(loader_data, method_data());
118 set_method_data(NULL);
119 MetadataFactory::free_metadata(loader_data, method_counters());
120 clear_method_counters();
121 // The nmethod will be gone when we get here.
122 if (code() != NULL) _code = NULL;
123 }
125 address Method::get_i2c_entry() {
126 assert(_adapter != NULL, "must have");
127 return _adapter->get_i2c_entry();
128 }
130 address Method::get_c2i_entry() {
131 assert(_adapter != NULL, "must have");
132 return _adapter->get_c2i_entry();
133 }
135 address Method::get_c2i_unverified_entry() {
136 assert(_adapter != NULL, "must have");
137 return _adapter->get_c2i_unverified_entry();
138 }
140 char* Method::name_and_sig_as_C_string() const {
141 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
142 }
144 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
145 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
146 }
148 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
149 const char* klass_name = klass->external_name();
150 int klass_name_len = (int)strlen(klass_name);
151 int method_name_len = method_name->utf8_length();
152 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
153 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
154 strcpy(dest, klass_name);
155 dest[klass_name_len] = '.';
156 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
157 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
158 dest[len] = 0;
159 return dest;
160 }
162 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
163 Symbol* klass_name = klass->name();
164 klass_name->as_klass_external_name(buf, size);
165 int len = (int)strlen(buf);
167 if (len < size - 1) {
168 buf[len++] = '.';
170 method_name->as_C_string(&(buf[len]), size - len);
171 len = (int)strlen(buf);
173 signature->as_C_string(&(buf[len]), size - len);
174 }
176 return buf;
177 }
179 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) {
180 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
181 // access exception table
182 ExceptionTable table(mh());
183 int length = table.length();
184 // iterate through all entries sequentially
185 constantPoolHandle pool(THREAD, mh->constants());
186 for (int i = 0; i < length; i ++) {
187 //reacquire the table in case a GC happened
188 ExceptionTable table(mh());
189 int beg_bci = table.start_pc(i);
190 int end_bci = table.end_pc(i);
191 assert(beg_bci <= end_bci, "inconsistent exception table");
192 if (beg_bci <= throw_bci && throw_bci < end_bci) {
193 // exception handler bci range covers throw_bci => investigate further
194 int handler_bci = table.handler_pc(i);
195 int klass_index = table.catch_type_index(i);
196 if (klass_index == 0) {
197 return handler_bci;
198 } else if (ex_klass.is_null()) {
199 return handler_bci;
200 } else {
201 // we know the exception class => get the constraint class
202 // this may require loading of the constraint class; if verification
203 // fails or some other exception occurs, return handler_bci
204 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
205 KlassHandle klass = KlassHandle(THREAD, k);
206 assert(klass.not_null(), "klass not loaded");
207 if (ex_klass->is_subtype_of(klass())) {
208 return handler_bci;
209 }
210 }
211 }
212 }
214 return -1;
215 }
217 void Method::mask_for(int bci, InterpreterOopMap* mask) {
219 Thread* myThread = Thread::current();
220 methodHandle h_this(myThread, this);
221 #ifdef ASSERT
222 bool has_capability = myThread->is_VM_thread() ||
223 myThread->is_ConcurrentGC_thread() ||
224 myThread->is_GC_task_thread();
226 if (!has_capability) {
227 if (!VerifyStack && !VerifyLastFrame) {
228 // verify stack calls this outside VM thread
229 warning("oopmap should only be accessed by the "
230 "VM, GC task or CMS threads (or during debugging)");
231 InterpreterOopMap local_mask;
232 method_holder()->mask_for(h_this, bci, &local_mask);
233 local_mask.print();
234 }
235 }
236 #endif
237 method_holder()->mask_for(h_this, bci, mask);
238 return;
239 }
242 int Method::bci_from(address bcp) const {
243 #ifdef ASSERT
244 { ResourceMark rm;
245 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
246 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string()));
247 }
248 #endif
249 return bcp - code_base();
250 }
253 // Return (int)bcx if it appears to be a valid BCI.
254 // Return bci_from((address)bcx) if it appears to be a valid BCP.
255 // Return -1 otherwise.
256 // Used by profiling code, when invalid data is a possibility.
257 // The caller is responsible for validating the Method* itself.
258 int Method::validate_bci_from_bcx(intptr_t bcx) const {
259 // keep bci as -1 if not a valid bci
260 int bci = -1;
261 if (bcx == 0 || (address)bcx == code_base()) {
262 // code_size() may return 0 and we allow 0 here
263 // the method may be native
264 bci = 0;
265 } else if (frame::is_bci(bcx)) {
266 if (bcx < code_size()) {
267 bci = (int)bcx;
268 }
269 } else if (contains((address)bcx)) {
270 bci = (address)bcx - code_base();
271 }
272 // Assert that if we have dodged any asserts, bci is negative.
273 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
274 return bci;
275 }
277 address Method::bcp_from(int bci) const {
278 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), err_msg("illegal bci: %d", bci));
279 address bcp = code_base() + bci;
280 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
281 return bcp;
282 }
285 int Method::size(bool is_native) {
286 // If native, then include pointers for native_function and signature_handler
287 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
288 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
289 return align_object_size(header_size() + extra_words);
290 }
293 Symbol* Method::klass_name() const {
294 Klass* k = method_holder();
295 assert(k->is_klass(), "must be klass");
296 InstanceKlass* ik = (InstanceKlass*) k;
297 return ik->name();
298 }
301 // Attempt to return method oop to original state. Clear any pointers
302 // (to objects outside the shared spaces). We won't be able to predict
303 // where they should point in a new JVM. Further initialize some
304 // entries now in order allow them to be write protected later.
306 void Method::remove_unshareable_info() {
307 unlink_method();
308 }
310 void Method::set_vtable_index(int index) {
311 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
312 // At runtime initialize_vtable is rerun as part of link_class_impl()
313 // for a shared class loaded by the non-boot loader to obtain the loader
314 // constraints based on the runtime classloaders' context.
315 return; // don't write into the shared class
316 } else {
317 _vtable_index = index;
318 }
319 }
321 void Method::set_itable_index(int index) {
322 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
323 // At runtime initialize_itable is rerun as part of link_class_impl()
324 // for a shared class loaded by the non-boot loader to obtain the loader
325 // constraints based on the runtime classloaders' context. The dumptime
326 // itable index should be the same as the runtime index.
327 assert(_vtable_index == itable_index_max - index,
328 "archived itable index is different from runtime index");
329 return; // don’t write into the shared class
330 } else {
331 _vtable_index = itable_index_max - index;
332 }
333 assert(valid_itable_index(), "");
334 }
338 bool Method::was_executed_more_than(int n) {
339 // Invocation counter is reset when the Method* is compiled.
340 // If the method has compiled code we therefore assume it has
341 // be excuted more than n times.
342 if (is_accessor() || is_empty_method() || (code() != NULL)) {
343 // interpreter doesn't bump invocation counter of trivial methods
344 // compiler does not bump invocation counter of compiled methods
345 return true;
346 }
347 else if ((method_counters() != NULL &&
348 method_counters()->invocation_counter()->carry()) ||
349 (method_data() != NULL &&
350 method_data()->invocation_counter()->carry())) {
351 // The carry bit is set when the counter overflows and causes
352 // a compilation to occur. We don't know how many times
353 // the counter has been reset, so we simply assume it has
354 // been executed more than n times.
355 return true;
356 } else {
357 return invocation_count() > n;
358 }
359 }
361 #ifndef PRODUCT
362 void Method::print_invocation_count() {
363 if (is_static()) tty->print("static ");
364 if (is_final()) tty->print("final ");
365 if (is_synchronized()) tty->print("synchronized ");
366 if (is_native()) tty->print("native ");
367 method_holder()->name()->print_symbol_on(tty);
368 tty->print(".");
369 name()->print_symbol_on(tty);
370 signature()->print_symbol_on(tty);
372 if (WizardMode) {
373 // dump the size of the byte codes
374 tty->print(" {%d}", code_size());
375 }
376 tty->cr();
378 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
379 tty->print_cr (" invocation_counter: %8d ", invocation_count());
380 tty->print_cr (" backedge_counter: %8d ", backedge_count());
381 if (CountCompiledCalls) {
382 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
383 }
385 }
386 #endif
388 // Build a MethodData* object to hold information about this method
389 // collected in the interpreter.
390 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
391 // Do not profile method if current thread holds the pending list lock,
392 // which avoids deadlock for acquiring the MethodData_lock.
393 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
394 return;
395 }
397 // Grab a lock here to prevent multiple
398 // MethodData*s from being created.
399 MutexLocker ml(MethodData_lock, THREAD);
400 if (method->method_data() == NULL) {
401 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
402 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);
403 method->set_method_data(method_data);
404 if (PrintMethodData && (Verbose || WizardMode)) {
405 ResourceMark rm(THREAD);
406 tty->print("build_interpreter_method_data for ");
407 method->print_name(tty);
408 tty->cr();
409 // At the end of the run, the MDO, full of data, will be dumped.
410 }
411 }
412 }
414 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
415 methodHandle mh(m);
416 ClassLoaderData* loader_data = mh->method_holder()->class_loader_data();
417 MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL);
418 if (!mh->init_method_counters(counters)) {
419 MetadataFactory::free_metadata(loader_data, counters);
420 }
421 return mh->method_counters();
422 }
424 void Method::cleanup_inline_caches() {
425 // The current system doesn't use inline caches in the interpreter
426 // => nothing to do (keep this method around for future use)
427 }
430 int Method::extra_stack_words() {
431 // not an inline function, to avoid a header dependency on Interpreter
432 return extra_stack_entries() * Interpreter::stackElementSize;
433 }
436 void Method::compute_size_of_parameters(Thread *thread) {
437 ArgumentSizeComputer asc(signature());
438 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
439 }
441 BasicType Method::result_type() const {
442 ResultTypeFinder rtf(signature());
443 return rtf.type();
444 }
447 bool Method::is_empty_method() const {
448 return code_size() == 1
449 && *code_base() == Bytecodes::_return;
450 }
453 bool Method::is_vanilla_constructor() const {
454 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
455 // which only calls the superclass vanilla constructor and possibly does stores of
456 // zero constants to local fields:
457 //
458 // aload_0
459 // invokespecial
460 // indexbyte1
461 // indexbyte2
462 //
463 // followed by an (optional) sequence of:
464 //
465 // aload_0
466 // aconst_null / iconst_0 / fconst_0 / dconst_0
467 // putfield
468 // indexbyte1
469 // indexbyte2
470 //
471 // followed by:
472 //
473 // return
475 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
476 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
477 int size = code_size();
478 // Check if size match
479 if (size == 0 || size % 5 != 0) return false;
480 address cb = code_base();
481 int last = size - 1;
482 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
483 // Does not call superclass default constructor
484 return false;
485 }
486 // Check optional sequence
487 for (int i = 4; i < last; i += 5) {
488 if (cb[i] != Bytecodes::_aload_0) return false;
489 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
490 if (cb[i+2] != Bytecodes::_putfield) return false;
491 }
492 return true;
493 }
496 bool Method::compute_has_loops_flag() {
497 BytecodeStream bcs(this);
498 Bytecodes::Code bc;
500 while ((bc = bcs.next()) >= 0) {
501 switch( bc ) {
502 case Bytecodes::_ifeq:
503 case Bytecodes::_ifnull:
504 case Bytecodes::_iflt:
505 case Bytecodes::_ifle:
506 case Bytecodes::_ifne:
507 case Bytecodes::_ifnonnull:
508 case Bytecodes::_ifgt:
509 case Bytecodes::_ifge:
510 case Bytecodes::_if_icmpeq:
511 case Bytecodes::_if_icmpne:
512 case Bytecodes::_if_icmplt:
513 case Bytecodes::_if_icmpgt:
514 case Bytecodes::_if_icmple:
515 case Bytecodes::_if_icmpge:
516 case Bytecodes::_if_acmpeq:
517 case Bytecodes::_if_acmpne:
518 case Bytecodes::_goto:
519 case Bytecodes::_jsr:
520 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
521 break;
523 case Bytecodes::_goto_w:
524 case Bytecodes::_jsr_w:
525 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
526 break;
527 }
528 }
529 _access_flags.set_loops_flag_init();
530 return _access_flags.has_loops();
531 }
533 bool Method::is_final_method(AccessFlags class_access_flags) const {
534 // or "does_not_require_vtable_entry"
535 // default method or overpass can occur, is not final (reuses vtable entry)
536 // private methods get vtable entries for backward class compatibility.
537 if (is_overpass() || is_default_method()) return false;
538 return is_final() || class_access_flags.is_final();
539 }
541 bool Method::is_final_method() const {
542 return is_final_method(method_holder()->access_flags());
543 }
545 bool Method::is_default_method() const {
546 if (method_holder() != NULL &&
547 method_holder()->is_interface() &&
548 !is_abstract()) {
549 return true;
550 } else {
551 return false;
552 }
553 }
555 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
556 if (is_final_method(class_access_flags)) return true;
557 #ifdef ASSERT
558 ResourceMark rm;
559 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
560 if (class_access_flags.is_interface()) {
561 assert(is_nonv == is_static(), err_msg("is_nonv=%s", name_and_sig_as_C_string()));
562 }
563 #endif
564 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
565 return vtable_index() == nonvirtual_vtable_index;
566 }
568 bool Method::can_be_statically_bound() const {
569 return can_be_statically_bound(method_holder()->access_flags());
570 }
572 bool Method::is_accessor() const {
573 if (code_size() != 5) return false;
574 if (size_of_parameters() != 1) return false;
575 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
576 if (java_code_at(1) != Bytecodes::_getfield) return false;
577 if (java_code_at(4) != Bytecodes::_areturn &&
578 java_code_at(4) != Bytecodes::_ireturn ) return false;
579 return true;
580 }
582 bool Method::is_constant_getter() const {
583 int last_index = code_size() - 1;
584 // Check if the first 1-3 bytecodes are a constant push
585 // and the last bytecode is a return.
586 return (2 <= code_size() && code_size() <= 4 &&
587 Bytecodes::is_const(java_code_at(0)) &&
588 Bytecodes::length_for(java_code_at(0)) == last_index &&
589 Bytecodes::is_return(java_code_at(last_index)));
590 }
592 bool Method::is_initializer() const {
593 return is_object_initializer() || is_static_initializer();
594 }
596 bool Method::has_valid_initializer_flags() const {
597 return (is_static() ||
598 method_holder()->major_version() < 51);
599 }
601 bool Method::is_static_initializer() const {
602 // For classfiles version 51 or greater, ensure that the clinit method is
603 // static. Non-static methods with the name "<clinit>" are not static
604 // initializers. (older classfiles exempted for backward compatibility)
605 return name() == vmSymbols::class_initializer_name() &&
606 has_valid_initializer_flags();
607 }
609 bool Method::is_object_initializer() const {
610 return name() == vmSymbols::object_initializer_name();
611 }
613 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) {
614 int length = this_oop->checked_exceptions_length();
615 if (length == 0) { // common case
616 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
617 } else {
618 methodHandle h_this(THREAD, this_oop);
619 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
620 objArrayHandle mirrors (THREAD, m_oop);
621 for (int i = 0; i < length; i++) {
622 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
623 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
624 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
625 mirrors->obj_at_put(i, k->java_mirror());
626 }
627 return mirrors;
628 }
629 };
632 int Method::line_number_from_bci(int bci) const {
633 if (bci == SynchronizationEntryBCI) bci = 0;
634 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
635 int best_bci = 0;
636 int best_line = -1;
638 if (has_linenumber_table()) {
639 // The line numbers are a short array of 2-tuples [start_pc, line_number].
640 // Not necessarily sorted and not necessarily one-to-one.
641 CompressedLineNumberReadStream stream(compressed_linenumber_table());
642 while (stream.read_pair()) {
643 if (stream.bci() == bci) {
644 // perfect match
645 return stream.line();
646 } else {
647 // update best_bci/line
648 if (stream.bci() < bci && stream.bci() >= best_bci) {
649 best_bci = stream.bci();
650 best_line = stream.line();
651 }
652 }
653 }
654 }
655 return best_line;
656 }
659 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
660 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
661 Thread *thread = Thread::current();
662 Symbol* klass_name = constants()->klass_name_at(klass_index);
663 Handle loader(thread, method_holder()->class_loader());
664 Handle prot (thread, method_holder()->protection_domain());
665 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
666 } else {
667 return true;
668 }
669 }
672 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
673 int klass_index = constants()->klass_ref_index_at(refinfo_index);
674 if (must_be_resolved) {
675 // Make sure klass is resolved in constantpool.
676 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
677 }
678 return is_klass_loaded_by_klass_index(klass_index);
679 }
682 void Method::set_native_function(address function, bool post_event_flag) {
683 assert(function != NULL, "use clear_native_function to unregister natives");
684 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
685 address* native_function = native_function_addr();
687 // We can see racers trying to place the same native function into place. Once
688 // is plenty.
689 address current = *native_function;
690 if (current == function) return;
691 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
692 function != NULL) {
693 // native_method_throw_unsatisfied_link_error_entry() should only
694 // be passed when post_event_flag is false.
695 assert(function !=
696 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
697 "post_event_flag mis-match");
699 // post the bind event, and possible change the bind function
700 JvmtiExport::post_native_method_bind(this, &function);
701 }
702 *native_function = function;
703 // This function can be called more than once. We must make sure that we always
704 // use the latest registered method -> check if a stub already has been generated.
705 // If so, we have to make it not_entrant.
706 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
707 if (nm != NULL) {
708 nm->make_not_entrant();
709 }
710 }
713 bool Method::has_native_function() const {
714 if (is_method_handle_intrinsic())
715 return false; // special-cased in SharedRuntime::generate_native_wrapper
716 address func = native_function();
717 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
718 }
721 void Method::clear_native_function() {
722 // Note: is_method_handle_intrinsic() is allowed here.
723 set_native_function(
724 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
725 !native_bind_event_is_interesting);
726 clear_code();
727 }
729 address Method::critical_native_function() {
730 methodHandle mh(this);
731 return NativeLookup::lookup_critical_entry(mh);
732 }
735 void Method::set_signature_handler(address handler) {
736 address* signature_handler = signature_handler_addr();
737 *signature_handler = handler;
738 }
741 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
742 if (PrintCompilation && report) {
743 ttyLocker ttyl;
744 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
745 if (comp_level == CompLevel_all) {
746 tty->print("all levels ");
747 } else {
748 tty->print("levels ");
749 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
750 tty->print("%d ", i);
751 }
752 }
753 this->print_short_name(tty);
754 int size = this->code_size();
755 if (size > 0) {
756 tty->print(" (%d bytes)", size);
757 }
758 if (reason != NULL) {
759 tty->print(" %s", reason);
760 }
761 tty->cr();
762 }
763 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
764 ttyLocker ttyl;
765 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
766 os::current_thread_id(), is_osr, comp_level);
767 if (reason != NULL) {
768 xtty->print(" reason=\'%s\'", reason);
769 }
770 xtty->method(this);
771 xtty->stamp();
772 xtty->end_elem();
773 }
774 }
776 bool Method::is_always_compilable() const {
777 // Generated adapters must be compiled
778 if (is_method_handle_intrinsic() && is_synthetic()) {
779 assert(!is_not_c1_compilable(), "sanity check");
780 assert(!is_not_c2_compilable(), "sanity check");
781 return true;
782 }
784 return false;
785 }
787 bool Method::is_not_compilable(int comp_level) const {
788 if (number_of_breakpoints() > 0)
789 return true;
790 if (is_always_compilable())
791 return false;
792 if (comp_level == CompLevel_any)
793 return is_not_c1_compilable() || is_not_c2_compilable();
794 if (is_c1_compile(comp_level))
795 return is_not_c1_compilable();
796 if (is_c2_compile(comp_level))
797 return is_not_c2_compilable();
798 return false;
799 }
801 // call this when compiler finds that this method is not compilable
802 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
803 if (is_always_compilable()) {
804 // Don't mark a method which should be always compilable
805 return;
806 }
807 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
808 if (comp_level == CompLevel_all) {
809 set_not_c1_compilable();
810 set_not_c2_compilable();
811 } else {
812 if (is_c1_compile(comp_level))
813 set_not_c1_compilable();
814 if (is_c2_compile(comp_level))
815 set_not_c2_compilable();
816 }
817 CompilationPolicy::policy()->disable_compilation(this);
818 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
819 }
821 bool Method::is_not_osr_compilable(int comp_level) const {
822 if (is_not_compilable(comp_level))
823 return true;
824 if (comp_level == CompLevel_any)
825 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
826 if (is_c1_compile(comp_level))
827 return is_not_c1_osr_compilable();
828 if (is_c2_compile(comp_level))
829 return is_not_c2_osr_compilable();
830 return false;
831 }
833 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
834 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
835 if (comp_level == CompLevel_all) {
836 set_not_c1_osr_compilable();
837 set_not_c2_osr_compilable();
838 } else {
839 if (is_c1_compile(comp_level))
840 set_not_c1_osr_compilable();
841 if (is_c2_compile(comp_level))
842 set_not_c2_osr_compilable();
843 }
844 CompilationPolicy::policy()->disable_compilation(this);
845 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
846 }
848 // Revert to using the interpreter and clear out the nmethod
849 void Method::clear_code(bool acquire_lock /* = true */) {
850 MutexLockerEx pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag);
851 // this may be NULL if c2i adapters have not been made yet
852 // Only should happen at allocate time.
853 if (_adapter == NULL) {
854 _from_compiled_entry = NULL;
855 } else {
856 _from_compiled_entry = _adapter->get_c2i_entry();
857 }
858 OrderAccess::storestore();
859 _from_interpreted_entry = _i2i_entry;
860 OrderAccess::storestore();
861 _code = NULL;
862 }
864 // Called by class data sharing to remove any entry points (which are not shared)
865 void Method::unlink_method() {
866 _code = NULL;
867 _i2i_entry = NULL;
868 _from_interpreted_entry = NULL;
869 if (is_native()) {
870 *native_function_addr() = NULL;
871 set_signature_handler(NULL);
872 }
873 NOT_PRODUCT(set_compiled_invocation_count(0);)
874 _adapter = NULL;
875 _from_compiled_entry = NULL;
877 // In case of DumpSharedSpaces, _method_data should always be NULL.
878 //
879 // During runtime (!DumpSharedSpaces), when we are cleaning a
880 // shared class that failed to load, this->link_method() may
881 // have already been called (before an exception happened), so
882 // this->_method_data may not be NULL.
883 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?");
885 set_method_data(NULL);
886 clear_method_counters();
887 }
889 // Called when the method_holder is getting linked. Setup entrypoints so the method
890 // is ready to be called from interpreter, compiler, and vtables.
891 void Method::link_method(methodHandle h_method, TRAPS) {
892 // If the code cache is full, we may reenter this function for the
893 // leftover methods that weren't linked.
894 if (_i2i_entry != NULL) return;
896 assert(_adapter == NULL, "init'd to NULL" );
897 assert( _code == NULL, "nothing compiled yet" );
899 // Setup interpreter entrypoint
900 assert(this == h_method(), "wrong h_method()" );
901 address entry = Interpreter::entry_for_method(h_method);
902 assert(entry != NULL, "interpreter entry must be non-null");
903 // Sets both _i2i_entry and _from_interpreted_entry
904 set_interpreter_entry(entry);
906 // Don't overwrite already registered native entries.
907 if (is_native() && !has_native_function()) {
908 set_native_function(
909 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
910 !native_bind_event_is_interesting);
911 }
913 // Setup compiler entrypoint. This is made eagerly, so we do not need
914 // special handling of vtables. An alternative is to make adapters more
915 // lazily by calling make_adapter() from from_compiled_entry() for the
916 // normal calls. For vtable calls life gets more complicated. When a
917 // call-site goes mega-morphic we need adapters in all methods which can be
918 // called from the vtable. We need adapters on such methods that get loaded
919 // later. Ditto for mega-morphic itable calls. If this proves to be a
920 // problem we'll make these lazily later.
921 (void) make_adapters(h_method, CHECK);
923 // ONLY USE the h_method now as make_adapter may have blocked
925 }
927 address Method::make_adapters(methodHandle mh, TRAPS) {
928 // Adapters for compiled code are made eagerly here. They are fairly
929 // small (generally < 100 bytes) and quick to make (and cached and shared)
930 // so making them eagerly shouldn't be too expensive.
931 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
932 if (adapter == NULL ) {
933 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
934 }
936 mh->set_adapter_entry(adapter);
937 mh->_from_compiled_entry = adapter->get_c2i_entry();
938 return adapter->get_c2i_entry();
939 }
941 void Method::restore_unshareable_info(TRAPS) {
942 // Since restore_unshareable_info can be called more than once for a method, don't
943 // redo any work. If this field is restored, there is nothing to do.
944 if (_from_compiled_entry == NULL) {
945 // restore method's vtable by calling a virtual function
946 restore_vtable();
948 methodHandle mh(THREAD, this);
949 link_method(mh, CHECK);
950 }
951 }
954 // The verified_code_entry() must be called when a invoke is resolved
955 // on this method.
957 // It returns the compiled code entry point, after asserting not null.
958 // This function is called after potential safepoints so that nmethod
959 // or adapter that it points to is still live and valid.
960 // This function must not hit a safepoint!
961 address Method::verified_code_entry() {
962 debug_only(No_Safepoint_Verifier nsv;)
963 assert(_from_compiled_entry != NULL, "must be set");
964 return _from_compiled_entry;
965 }
967 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
968 // (could be racing a deopt).
969 // Not inline to avoid circular ref.
970 bool Method::check_code() const {
971 // cached in a register or local. There's a race on the value of the field.
972 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
973 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
974 }
976 // Install compiled code. Instantly it can execute.
977 void Method::set_code(methodHandle mh, nmethod *code) {
978 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
979 assert( code, "use clear_code to remove code" );
980 assert( mh->check_code(), "" );
982 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
984 // These writes must happen in this order, because the interpreter will
985 // directly jump to from_interpreted_entry which jumps to an i2c adapter
986 // which jumps to _from_compiled_entry.
987 mh->_code = code; // Assign before allowing compiled code to exec
989 int comp_level = code->comp_level();
990 // In theory there could be a race here. In practice it is unlikely
991 // and not worth worrying about.
992 if (comp_level > mh->highest_comp_level()) {
993 mh->set_highest_comp_level(comp_level);
994 }
996 OrderAccess::storestore();
997 #ifdef SHARK
998 mh->_from_interpreted_entry = code->insts_begin();
999 #else //!SHARK
1000 mh->_from_compiled_entry = code->verified_entry_point();
1001 OrderAccess::storestore();
1002 // Instantly compiled code can execute.
1003 if (!mh->is_method_handle_intrinsic())
1004 mh->_from_interpreted_entry = mh->get_i2c_entry();
1005 #endif //!SHARK
1006 }
1009 bool Method::is_overridden_in(Klass* k) const {
1010 InstanceKlass* ik = InstanceKlass::cast(k);
1012 if (ik->is_interface()) return false;
1014 // If method is an interface, we skip it - except if it
1015 // is a miranda method
1016 if (method_holder()->is_interface()) {
1017 // Check that method is not a miranda method
1018 if (ik->lookup_method(name(), signature()) == NULL) {
1019 // No implementation exist - so miranda method
1020 return false;
1021 }
1022 return true;
1023 }
1025 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1026 assert(ik->vtable() != NULL, "vtable should exist");
1027 if (!has_vtable_index()) {
1028 return false;
1029 } else {
1030 Method* vt_m = ik->method_at_vtable(vtable_index());
1031 return vt_m != this;
1032 }
1033 }
1036 // give advice about whether this Method* should be cached or not
1037 bool Method::should_not_be_cached() const {
1038 if (is_old()) {
1039 // This method has been redefined. It is either EMCP or obsolete
1040 // and we don't want to cache it because that would pin the method
1041 // down and prevent it from being collectible if and when it
1042 // finishes executing.
1043 return true;
1044 }
1046 // caching this method should be just fine
1047 return false;
1048 }
1051 /**
1052 * Returns true if this is one of the specially treated methods for
1053 * security related stack walks (like Reflection.getCallerClass).
1054 */
1055 bool Method::is_ignored_by_security_stack_walk() const {
1056 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection;
1058 if (intrinsic_id() == vmIntrinsics::_invoke) {
1059 // This is Method.invoke() -- ignore it
1060 return true;
1061 }
1062 if (use_new_reflection &&
1063 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1064 // This is an auxilary frame -- ignore it
1065 return true;
1066 }
1067 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1068 // This is an internal adapter frame for method handles -- ignore it
1069 return true;
1070 }
1071 return false;
1072 }
1075 // Constant pool structure for invoke methods:
1076 enum {
1077 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1078 _imcp_invoke_signature, // utf8: (variable Symbol*)
1079 _imcp_limit
1080 };
1082 // Test if this method is an MH adapter frame generated by Java code.
1083 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1084 bool Method::is_compiled_lambda_form() const {
1085 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1086 }
1088 // Test if this method is an internal MH primitive method.
1089 bool Method::is_method_handle_intrinsic() const {
1090 vmIntrinsics::ID iid = intrinsic_id();
1091 return (MethodHandles::is_signature_polymorphic(iid) &&
1092 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1093 }
1095 bool Method::has_member_arg() const {
1096 vmIntrinsics::ID iid = intrinsic_id();
1097 return (MethodHandles::is_signature_polymorphic(iid) &&
1098 MethodHandles::has_member_arg(iid));
1099 }
1101 // Make an instance of a signature-polymorphic internal MH primitive.
1102 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1103 Symbol* signature,
1104 TRAPS) {
1105 ResourceMark rm;
1106 methodHandle empty;
1108 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1109 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1110 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1111 if (TraceMethodHandles) {
1112 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1113 }
1115 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1116 name->increment_refcount();
1117 signature->increment_refcount();
1119 int cp_length = _imcp_limit;
1120 ClassLoaderData* loader_data = holder->class_loader_data();
1121 constantPoolHandle cp;
1122 {
1123 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1124 cp = constantPoolHandle(THREAD, cp_oop);
1125 }
1126 cp->set_pool_holder(InstanceKlass::cast(holder()));
1127 cp->symbol_at_put(_imcp_invoke_name, name);
1128 cp->symbol_at_put(_imcp_invoke_signature, signature);
1129 cp->set_has_preresolution();
1131 // decide on access bits: public or not?
1132 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1133 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1134 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1135 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1137 methodHandle m;
1138 {
1139 InlineTableSizes sizes;
1140 Method* m_oop = Method::allocate(loader_data, 0,
1141 accessFlags_from(flags_bits), &sizes,
1142 ConstMethod::NORMAL, CHECK_(empty));
1143 m = methodHandle(THREAD, m_oop);
1144 }
1145 m->set_constants(cp());
1146 m->set_name_index(_imcp_invoke_name);
1147 m->set_signature_index(_imcp_invoke_signature);
1148 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1149 assert(m->signature() == signature, "");
1150 ResultTypeFinder rtf(signature);
1151 m->constMethod()->set_result_type(rtf.type());
1152 m->compute_size_of_parameters(THREAD);
1153 m->init_intrinsic_id();
1154 assert(m->is_method_handle_intrinsic(), "");
1155 #ifdef ASSERT
1156 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1157 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1158 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1159 #endif //ASSERT
1161 // Finally, set up its entry points.
1162 assert(m->can_be_statically_bound(), "");
1163 m->set_vtable_index(Method::nonvirtual_vtable_index);
1164 m->link_method(m, CHECK_(empty));
1166 if (TraceMethodHandles && (Verbose || WizardMode))
1167 m->print_on(tty);
1169 return m;
1170 }
1172 Klass* Method::check_non_bcp_klass(Klass* klass) {
1173 if (klass != NULL && klass->class_loader() != NULL) {
1174 if (klass->oop_is_objArray())
1175 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1176 return klass;
1177 }
1178 return NULL;
1179 }
1182 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1183 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1184 // Code below does not work for native methods - they should never get rewritten anyway
1185 assert(!m->is_native(), "cannot rewrite native methods");
1186 // Allocate new Method*
1187 AccessFlags flags = m->access_flags();
1189 ConstMethod* cm = m->constMethod();
1190 int checked_exceptions_len = cm->checked_exceptions_length();
1191 int localvariable_len = cm->localvariable_table_length();
1192 int exception_table_len = cm->exception_table_length();
1193 int method_parameters_len = cm->method_parameters_length();
1194 int method_annotations_len = cm->method_annotations_length();
1195 int parameter_annotations_len = cm->parameter_annotations_length();
1196 int type_annotations_len = cm->type_annotations_length();
1197 int default_annotations_len = cm->default_annotations_length();
1199 InlineTableSizes sizes(
1200 localvariable_len,
1201 new_compressed_linenumber_size,
1202 exception_table_len,
1203 checked_exceptions_len,
1204 method_parameters_len,
1205 cm->generic_signature_index(),
1206 method_annotations_len,
1207 parameter_annotations_len,
1208 type_annotations_len,
1209 default_annotations_len,
1210 0);
1212 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1213 Method* newm_oop = Method::allocate(loader_data,
1214 new_code_length,
1215 flags,
1216 &sizes,
1217 m->method_type(),
1218 CHECK_(methodHandle()));
1219 methodHandle newm (THREAD, newm_oop);
1220 int new_method_size = newm->method_size();
1222 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1223 ConstMethod* newcm = newm->constMethod();
1224 int new_const_method_size = newm->constMethod()->size();
1226 memcpy(newm(), m(), sizeof(Method));
1228 // Create shallow copy of ConstMethod.
1229 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1231 // Reset correct method/const method, method size, and parameter info
1232 newm->set_constMethod(newcm);
1233 newm->constMethod()->set_code_size(new_code_length);
1234 newm->constMethod()->set_constMethod_size(new_const_method_size);
1235 newm->set_method_size(new_method_size);
1236 assert(newm->code_size() == new_code_length, "check");
1237 assert(newm->method_parameters_length() == method_parameters_len, "check");
1238 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1239 assert(newm->exception_table_length() == exception_table_len, "check");
1240 assert(newm->localvariable_table_length() == localvariable_len, "check");
1241 // Copy new byte codes
1242 memcpy(newm->code_base(), new_code, new_code_length);
1243 // Copy line number table
1244 if (new_compressed_linenumber_size > 0) {
1245 memcpy(newm->compressed_linenumber_table(),
1246 new_compressed_linenumber_table,
1247 new_compressed_linenumber_size);
1248 }
1249 // Copy method_parameters
1250 if (method_parameters_len > 0) {
1251 memcpy(newm->method_parameters_start(),
1252 m->method_parameters_start(),
1253 method_parameters_len * sizeof(MethodParametersElement));
1254 }
1255 // Copy checked_exceptions
1256 if (checked_exceptions_len > 0) {
1257 memcpy(newm->checked_exceptions_start(),
1258 m->checked_exceptions_start(),
1259 checked_exceptions_len * sizeof(CheckedExceptionElement));
1260 }
1261 // Copy exception table
1262 if (exception_table_len > 0) {
1263 memcpy(newm->exception_table_start(),
1264 m->exception_table_start(),
1265 exception_table_len * sizeof(ExceptionTableElement));
1266 }
1267 // Copy local variable number table
1268 if (localvariable_len > 0) {
1269 memcpy(newm->localvariable_table_start(),
1270 m->localvariable_table_start(),
1271 localvariable_len * sizeof(LocalVariableTableElement));
1272 }
1273 // Copy stackmap table
1274 if (m->has_stackmap_table()) {
1275 int code_attribute_length = m->stackmap_data()->length();
1276 Array<u1>* stackmap_data =
1277 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1278 memcpy((void*)stackmap_data->adr_at(0),
1279 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1280 newm->set_stackmap_data(stackmap_data);
1281 }
1283 // copy annotations over to new method
1284 newcm->copy_annotations_from(cm);
1285 return newm;
1286 }
1288 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1289 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1290 // because we are not loading from core libraries
1291 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1292 // which does not use the class default class loader so we check for its loader here
1293 InstanceKlass* ik = InstanceKlass::cast(holder);
1294 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) {
1295 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1296 }
1298 // see if the klass name is well-known:
1299 Symbol* klass_name = ik->name();
1300 return vmSymbols::find_sid(klass_name);
1301 }
1303 void Method::init_intrinsic_id() {
1304 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1305 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1306 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1307 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1309 // the klass name is well-known:
1310 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1311 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1313 // ditto for method and signature:
1314 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1315 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1316 && name_id == vmSymbols::NO_SID)
1317 return;
1318 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1319 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1320 && sig_id == vmSymbols::NO_SID) return;
1321 jshort flags = access_flags().as_short();
1323 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1324 if (id != vmIntrinsics::_none) {
1325 set_intrinsic_id(id);
1326 return;
1327 }
1329 // A few slightly irregular cases:
1330 switch (klass_id) {
1331 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1332 // Second chance: check in regular Math.
1333 switch (name_id) {
1334 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1335 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1336 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1337 // pretend it is the corresponding method in the non-strict class:
1338 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1339 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1340 break;
1341 }
1342 break;
1344 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1345 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1346 if (!is_native()) break;
1347 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1348 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1349 id = vmIntrinsics::_none;
1350 break;
1351 }
1353 if (id != vmIntrinsics::_none) {
1354 // Set up its iid. It is an alias method.
1355 set_intrinsic_id(id);
1356 return;
1357 }
1358 }
1360 // These two methods are static since a GC may move the Method
1361 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1362 if (THREAD->is_Compiler_thread()) {
1363 // There is nothing useful this routine can do from within the Compile thread.
1364 // Hopefully, the signature contains only well-known classes.
1365 // We could scan for this and return true/false, but the caller won't care.
1366 return false;
1367 }
1368 bool sig_is_loaded = true;
1369 Handle class_loader(THREAD, m->method_holder()->class_loader());
1370 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1371 ResourceMark rm(THREAD);
1372 Symbol* signature = m->signature();
1373 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1374 if (ss.is_object()) {
1375 Symbol* sym = ss.as_symbol(CHECK_(false));
1376 Symbol* name = sym;
1377 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1378 protection_domain, THREAD);
1379 // We are loading classes eagerly. If a ClassNotFoundException or
1380 // a LinkageError was generated, be sure to ignore it.
1381 if (HAS_PENDING_EXCEPTION) {
1382 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1383 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1384 CLEAR_PENDING_EXCEPTION;
1385 } else {
1386 return false;
1387 }
1388 }
1389 if( klass == NULL) { sig_is_loaded = false; }
1390 }
1391 }
1392 return sig_is_loaded;
1393 }
1395 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1396 Handle class_loader(THREAD, m->method_holder()->class_loader());
1397 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1398 ResourceMark rm(THREAD);
1399 Symbol* signature = m->signature();
1400 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1401 if (ss.type() == T_OBJECT) {
1402 Symbol* name = ss.as_symbol_or_null();
1403 if (name == NULL) return true;
1404 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1405 if (klass == NULL) return true;
1406 }
1407 }
1408 return false;
1409 }
1411 // Exposed so field engineers can debug VM
1412 void Method::print_short_name(outputStream* st) {
1413 ResourceMark rm;
1414 #ifdef PRODUCT
1415 st->print(" %s::", method_holder()->external_name());
1416 #else
1417 st->print(" %s::", method_holder()->internal_name());
1418 #endif
1419 name()->print_symbol_on(st);
1420 if (WizardMode) signature()->print_symbol_on(st);
1421 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1422 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1423 }
1425 // Comparer for sorting an object array containing
1426 // Method*s.
1427 static int method_comparator(Method* a, Method* b) {
1428 return a->name()->fast_compare(b->name());
1429 }
1431 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1432 // default_methods also uses this without the ordering for fast find_method
1433 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1434 int length = methods->length();
1435 if (length > 1) {
1436 {
1437 No_Safepoint_Verifier nsv;
1438 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1439 }
1440 // Reset method ordering
1441 if (set_idnums) {
1442 for (int i = 0; i < length; i++) {
1443 Method* m = methods->at(i);
1444 m->set_method_idnum(i);
1445 m->set_orig_method_idnum(i);
1446 }
1447 }
1448 }
1449 }
1451 //-----------------------------------------------------------------------------------
1452 // Non-product code unless JVM/TI needs it
1454 #if !defined(PRODUCT) || INCLUDE_JVMTI
1455 class SignatureTypePrinter : public SignatureTypeNames {
1456 private:
1457 outputStream* _st;
1458 bool _use_separator;
1460 void type_name(const char* name) {
1461 if (_use_separator) _st->print(", ");
1462 _st->print("%s", name);
1463 _use_separator = true;
1464 }
1466 public:
1467 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1468 _st = st;
1469 _use_separator = false;
1470 }
1472 void print_parameters() { _use_separator = false; iterate_parameters(); }
1473 void print_returntype() { _use_separator = false; iterate_returntype(); }
1474 };
1477 void Method::print_name(outputStream* st) {
1478 Thread *thread = Thread::current();
1479 ResourceMark rm(thread);
1480 SignatureTypePrinter sig(signature(), st);
1481 st->print("%s ", is_static() ? "static" : "virtual");
1482 sig.print_returntype();
1483 st->print(" %s.", method_holder()->internal_name());
1484 name()->print_symbol_on(st);
1485 st->print("(");
1486 sig.print_parameters();
1487 st->print(")");
1488 }
1489 #endif // !PRODUCT || INCLUDE_JVMTI
1492 //-----------------------------------------------------------------------------------
1493 // Non-product code
1495 #ifndef PRODUCT
1496 void Method::print_codes_on(outputStream* st) const {
1497 print_codes_on(0, code_size(), st);
1498 }
1500 void Method::print_codes_on(int from, int to, outputStream* st) const {
1501 Thread *thread = Thread::current();
1502 ResourceMark rm(thread);
1503 methodHandle mh (thread, (Method*)this);
1504 BytecodeStream s(mh);
1505 s.set_interval(from, to);
1506 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1507 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1508 }
1509 #endif // not PRODUCT
1512 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1513 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1514 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1515 // as end-of-stream terminator.
1517 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1518 // bci and line number does not compress into single byte.
1519 // Write out escape character and use regular compression for bci and line number.
1520 write_byte((jubyte)0xFF);
1521 write_signed_int(bci_delta);
1522 write_signed_int(line_delta);
1523 }
1525 // See comment in method.hpp which explains why this exists.
1526 #if defined(_M_AMD64) && _MSC_VER >= 1400
1527 #pragma optimize("", off)
1528 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1529 write_pair_inline(bci, line);
1530 }
1531 #pragma optimize("", on)
1532 #endif
1534 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1535 _bci = 0;
1536 _line = 0;
1537 };
1540 bool CompressedLineNumberReadStream::read_pair() {
1541 jubyte next = read_byte();
1542 // Check for terminator
1543 if (next == 0) return false;
1544 if (next == 0xFF) {
1545 // Escape character, regular compression used
1546 _bci += read_signed_int();
1547 _line += read_signed_int();
1548 } else {
1549 // Single byte compression used
1550 _bci += next >> 3;
1551 _line += next & 0x7;
1552 }
1553 return true;
1554 }
1557 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1558 BreakpointInfo* bp = method_holder()->breakpoints();
1559 for (; bp != NULL; bp = bp->next()) {
1560 if (bp->match(this, bci)) {
1561 return bp->orig_bytecode();
1562 }
1563 }
1564 {
1565 ResourceMark rm;
1566 fatal(err_msg("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci));
1567 }
1568 return Bytecodes::_shouldnotreachhere;
1569 }
1571 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1572 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1573 BreakpointInfo* bp = method_holder()->breakpoints();
1574 for (; bp != NULL; bp = bp->next()) {
1575 if (bp->match(this, bci)) {
1576 bp->set_orig_bytecode(code);
1577 // and continue, in case there is more than one
1578 }
1579 }
1580 }
1582 void Method::set_breakpoint(int bci) {
1583 InstanceKlass* ik = method_holder();
1584 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1585 bp->set_next(ik->breakpoints());
1586 ik->set_breakpoints(bp);
1587 // do this last:
1588 bp->set(this);
1589 }
1591 static void clear_matches(Method* m, int bci) {
1592 InstanceKlass* ik = m->method_holder();
1593 BreakpointInfo* prev_bp = NULL;
1594 BreakpointInfo* next_bp;
1595 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1596 next_bp = bp->next();
1597 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1598 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1599 // do this first:
1600 bp->clear(m);
1601 // unhook it
1602 if (prev_bp != NULL)
1603 prev_bp->set_next(next_bp);
1604 else
1605 ik->set_breakpoints(next_bp);
1606 delete bp;
1607 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1608 // at same location. So we have multiple matching (method_index and bci)
1609 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1610 // breakpoint for clear_breakpoint request and keep all other method versions
1611 // BreakpointInfo for future clear_breakpoint request.
1612 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1613 // which is being called when class is unloaded. We delete all the Breakpoint
1614 // information for all versions of method. We may not correctly restore the original
1615 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1616 // so these methods won't be used anymore.
1617 if (bci >= 0) {
1618 break;
1619 }
1620 } else {
1621 // This one is a keeper.
1622 prev_bp = bp;
1623 }
1624 }
1625 }
1627 void Method::clear_breakpoint(int bci) {
1628 assert(bci >= 0, "");
1629 clear_matches(this, bci);
1630 }
1632 void Method::clear_all_breakpoints() {
1633 clear_matches(this, -1);
1634 }
1637 int Method::invocation_count() {
1638 MethodCounters *mcs = method_counters();
1639 if (TieredCompilation) {
1640 MethodData* const mdo = method_data();
1641 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1642 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1643 return InvocationCounter::count_limit;
1644 } else {
1645 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1646 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1647 }
1648 } else {
1649 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1650 }
1651 }
1653 int Method::backedge_count() {
1654 MethodCounters *mcs = method_counters();
1655 if (TieredCompilation) {
1656 MethodData* const mdo = method_data();
1657 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1658 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1659 return InvocationCounter::count_limit;
1660 } else {
1661 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1662 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1663 }
1664 } else {
1665 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1666 }
1667 }
1669 int Method::highest_comp_level() const {
1670 const MethodCounters* mcs = method_counters();
1671 if (mcs != NULL) {
1672 return mcs->highest_comp_level();
1673 } else {
1674 return CompLevel_none;
1675 }
1676 }
1678 int Method::highest_osr_comp_level() const {
1679 const MethodCounters* mcs = method_counters();
1680 if (mcs != NULL) {
1681 return mcs->highest_osr_comp_level();
1682 } else {
1683 return CompLevel_none;
1684 }
1685 }
1687 void Method::set_highest_comp_level(int level) {
1688 MethodCounters* mcs = method_counters();
1689 if (mcs != NULL) {
1690 mcs->set_highest_comp_level(level);
1691 }
1692 }
1694 void Method::set_highest_osr_comp_level(int level) {
1695 MethodCounters* mcs = method_counters();
1696 if (mcs != NULL) {
1697 mcs->set_highest_osr_comp_level(level);
1698 }
1699 }
1701 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1702 _bci = bci;
1703 _name_index = m->name_index();
1704 _signature_index = m->signature_index();
1705 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1706 if (_orig_bytecode == Bytecodes::_breakpoint)
1707 _orig_bytecode = m->orig_bytecode_at(_bci);
1708 _next = NULL;
1709 }
1711 void BreakpointInfo::set(Method* method) {
1712 #ifdef ASSERT
1713 {
1714 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1715 if (code == Bytecodes::_breakpoint)
1716 code = method->orig_bytecode_at(_bci);
1717 assert(orig_bytecode() == code, "original bytecode must be the same");
1718 }
1719 #endif
1720 Thread *thread = Thread::current();
1721 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1722 method->incr_number_of_breakpoints(thread);
1723 SystemDictionary::notice_modification();
1724 {
1725 // Deoptimize all dependents on this method
1726 HandleMark hm(thread);
1727 methodHandle mh(thread, method);
1728 Universe::flush_dependents_on_method(mh);
1729 }
1730 }
1732 void BreakpointInfo::clear(Method* method) {
1733 *method->bcp_from(_bci) = orig_bytecode();
1734 assert(method->number_of_breakpoints() > 0, "must not go negative");
1735 method->decr_number_of_breakpoints(Thread::current());
1736 }
1738 // jmethodID handling
1740 // This is a block allocating object, sort of like JNIHandleBlock, only a
1741 // lot simpler. There aren't many of these, they aren't long, they are rarely
1742 // deleted and so we can do some suboptimal things.
1743 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1744 // never get rid of it.
1745 // It would be nice to be able to parameterize the number of methods for
1746 // the null_class_loader but then we'd have to turn this and ClassLoaderData
1747 // into templates.
1749 // I feel like this brain dead class should exist somewhere in the STL
1751 class JNIMethodBlock : public CHeapObj<mtClass> {
1752 enum { number_of_methods = 8 };
1754 Method* _methods[number_of_methods];
1755 int _top;
1756 JNIMethodBlock* _next;
1757 public:
1758 static Method* const _free_method;
1760 JNIMethodBlock() : _next(NULL), _top(0) {
1761 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method;
1762 }
1764 Method** add_method(Method* m) {
1765 if (_top < number_of_methods) {
1766 // top points to the next free entry.
1767 int i = _top;
1768 _methods[i] = m;
1769 _top++;
1770 return &_methods[i];
1771 } else if (_top == number_of_methods) {
1772 // if the next free entry ran off the block see if there's a free entry
1773 for (int i = 0; i< number_of_methods; i++) {
1774 if (_methods[i] == _free_method) {
1775 _methods[i] = m;
1776 return &_methods[i];
1777 }
1778 }
1779 // Only check each block once for frees. They're very unlikely.
1780 // Increment top past the end of the block.
1781 _top++;
1782 }
1783 // need to allocate a next block.
1784 if (_next == NULL) {
1785 _next = new JNIMethodBlock();
1786 }
1787 return _next->add_method(m);
1788 }
1790 bool contains(Method** m) {
1791 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1792 for (int i = 0; i< number_of_methods; i++) {
1793 if (&(b->_methods[i]) == m) {
1794 return true;
1795 }
1796 }
1797 }
1798 return false; // not found
1799 }
1801 // Doesn't really destroy it, just marks it as free so it can be reused.
1802 void destroy_method(Method** m) {
1803 #ifdef ASSERT
1804 assert(contains(m), "should be a methodID");
1805 #endif // ASSERT
1806 *m = _free_method;
1807 }
1808 void clear_method(Method* m) {
1809 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1810 for (int i = 0; i < number_of_methods; i++) {
1811 if (b->_methods[i] == m) {
1812 b->_methods[i] = NULL;
1813 return;
1814 }
1815 }
1816 }
1817 // not found
1818 }
1820 // During class unloading the methods are cleared, which is different
1821 // than freed.
1822 void clear_all_methods() {
1823 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1824 for (int i = 0; i< number_of_methods; i++) {
1825 b->_methods[i] = NULL;
1826 }
1827 }
1828 }
1829 #ifndef PRODUCT
1830 int count_methods() {
1831 // count all allocated methods
1832 int count = 0;
1833 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1834 for (int i = 0; i< number_of_methods; i++) {
1835 if (b->_methods[i] != _free_method) count++;
1836 }
1837 }
1838 return count;
1839 }
1840 #endif // PRODUCT
1841 };
1843 // Something that can't be mistaken for an address or a markOop
1844 Method* const JNIMethodBlock::_free_method = (Method*)55;
1846 // Add a method id to the jmethod_ids
1847 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
1848 ClassLoaderData* cld = loader_data;
1850 if (!SafepointSynchronize::is_at_safepoint()) {
1851 // Have to add jmethod_ids() to class loader data thread-safely.
1852 // Also have to add the method to the list safely, which the cld lock
1853 // protects as well.
1854 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1855 if (cld->jmethod_ids() == NULL) {
1856 cld->set_jmethod_ids(new JNIMethodBlock());
1857 }
1858 // jmethodID is a pointer to Method*
1859 return (jmethodID)cld->jmethod_ids()->add_method(m);
1860 } else {
1861 // At safepoint, we are single threaded and can set this.
1862 if (cld->jmethod_ids() == NULL) {
1863 cld->set_jmethod_ids(new JNIMethodBlock());
1864 }
1865 // jmethodID is a pointer to Method*
1866 return (jmethodID)cld->jmethod_ids()->add_method(m);
1867 }
1868 }
1870 // Mark a jmethodID as free. This is called when there is a data race in
1871 // InstanceKlass while creating the jmethodID cache.
1872 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
1873 ClassLoaderData* cld = loader_data;
1874 Method** ptr = (Method**)m;
1875 assert(cld->jmethod_ids() != NULL, "should have method handles");
1876 cld->jmethod_ids()->destroy_method(ptr);
1877 }
1879 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
1880 // Can't assert the method_holder is the same because the new method has the
1881 // scratch method holder.
1882 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
1883 == new_method->method_holder()->class_loader(),
1884 "changing to a different class loader");
1885 // Just change the method in place, jmethodID pointer doesn't change.
1886 *((Method**)jmid) = new_method;
1887 }
1889 bool Method::is_method_id(jmethodID mid) {
1890 Method* m = resolve_jmethod_id(mid);
1891 if (m == NULL) {
1892 return false;
1893 }
1894 InstanceKlass* ik = m->method_holder();
1895 if (ik == NULL) {
1896 return false;
1897 }
1898 ClassLoaderData* cld = ik->class_loader_data();
1899 if (cld->jmethod_ids() == NULL) return false;
1900 return (cld->jmethod_ids()->contains((Method**)mid));
1901 }
1903 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
1904 if (mid == NULL) return NULL;
1905 if (!Method::is_method_id(mid)) {
1906 return NULL;
1907 }
1908 Method* o = resolve_jmethod_id(mid);
1909 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
1910 return NULL;
1911 }
1912 return o;
1913 };
1915 void Method::set_on_stack(const bool value) {
1916 // Set both the method itself and its constant pool. The constant pool
1917 // on stack means some method referring to it is also on the stack.
1918 constants()->set_on_stack(value);
1920 bool succeeded = _access_flags.set_on_stack(value);
1921 if (value && succeeded) {
1922 MetadataOnStackMark::record(this, Thread::current());
1923 }
1924 }
1926 void Method::clear_jmethod_id(ClassLoaderData* loader_data) {
1927 loader_data->jmethod_ids()->clear_method(this);
1928 }
1930 // Called when the class loader is unloaded to make all methods weak.
1931 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1932 loader_data->jmethod_ids()->clear_all_methods();
1933 }
1935 bool Method::has_method_vptr(const void* ptr) {
1936 Method m;
1937 // This assumes that the vtbl pointer is the first word of a C++ object.
1938 // This assumption is also in universe.cpp patch_klass_vtble
1939 void* vtbl2 = dereference_vptr((const void*)&m);
1940 void* this_vtbl = dereference_vptr(ptr);
1941 return vtbl2 == this_vtbl;
1942 }
1944 // Check that this pointer is valid by checking that the vtbl pointer matches
1945 bool Method::is_valid_method() const {
1946 if (this == NULL) {
1947 return false;
1948 } else if (!is_metaspace_object()) {
1949 return false;
1950 } else {
1951 return has_method_vptr((const void*)this);
1952 }
1953 }
1955 #ifndef PRODUCT
1956 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1957 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1958 }
1959 #endif // PRODUCT
1962 // Printing
1964 #ifndef PRODUCT
1966 void Method::print_on(outputStream* st) const {
1967 ResourceMark rm;
1968 assert(is_method(), "must be method");
1969 st->print_cr("%s", internal_name());
1970 // get the effect of PrintOopAddress, always, for methods:
1971 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this);
1972 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
1973 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants());
1974 constants()->print_value_on(st); st->cr();
1975 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
1976 st->print (" - name: "); name()->print_value_on(st); st->cr();
1977 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
1978 st->print_cr(" - max stack: %d", max_stack());
1979 st->print_cr(" - max locals: %d", max_locals());
1980 st->print_cr(" - size of params: %d", size_of_parameters());
1981 st->print_cr(" - method size: %d", method_size());
1982 if (intrinsic_id() != vmIntrinsics::_none)
1983 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
1984 if (highest_comp_level() != CompLevel_none)
1985 st->print_cr(" - highest level: %d", highest_comp_level());
1986 st->print_cr(" - vtable index: %d", _vtable_index);
1987 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
1988 st->print( " - adapters: ");
1989 AdapterHandlerEntry* a = ((Method*)this)->adapter();
1990 if (a == NULL)
1991 st->print_cr(INTPTR_FORMAT, a);
1992 else
1993 a->print_adapter_on(st);
1994 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
1995 st->print_cr(" - code size: %d", code_size());
1996 if (code_size() != 0) {
1997 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
1998 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
1999 }
2000 if (method_data() != NULL) {
2001 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
2002 }
2003 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2004 if (checked_exceptions_length() > 0) {
2005 CheckedExceptionElement* table = checked_exceptions_start();
2006 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
2007 if (Verbose) {
2008 for (int i = 0; i < checked_exceptions_length(); i++) {
2009 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2010 }
2011 }
2012 }
2013 if (has_linenumber_table()) {
2014 u_char* table = compressed_linenumber_table();
2015 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
2016 if (Verbose) {
2017 CompressedLineNumberReadStream stream(table);
2018 while (stream.read_pair()) {
2019 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2020 }
2021 }
2022 }
2023 st->print_cr(" - localvar length: %d", localvariable_table_length());
2024 if (localvariable_table_length() > 0) {
2025 LocalVariableTableElement* table = localvariable_table_start();
2026 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
2027 if (Verbose) {
2028 for (int i = 0; i < localvariable_table_length(); i++) {
2029 int bci = table[i].start_bci;
2030 int len = table[i].length;
2031 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2032 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2033 int slot = table[i].slot;
2034 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2035 }
2036 }
2037 }
2038 if (code() != NULL) {
2039 st->print (" - compiled code: ");
2040 code()->print_value_on(st);
2041 }
2042 if (is_native()) {
2043 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
2044 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
2045 }
2046 }
2048 #endif //PRODUCT
2050 void Method::print_value_on(outputStream* st) const {
2051 assert(is_method(), "must be method");
2052 st->print("%s", internal_name());
2053 print_address_on(st);
2054 st->print(" ");
2055 name()->print_value_on(st);
2056 st->print(" ");
2057 signature()->print_value_on(st);
2058 st->print(" in ");
2059 method_holder()->print_value_on(st);
2060 if (WizardMode) st->print("#%d", _vtable_index);
2061 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2062 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2063 }
2065 #if INCLUDE_SERVICES
2066 // Size Statistics
2067 void Method::collect_statistics(KlassSizeStats *sz) const {
2068 int mysize = sz->count(this);
2069 sz->_method_bytes += mysize;
2070 sz->_method_all_bytes += mysize;
2071 sz->_rw_bytes += mysize;
2073 if (constMethod()) {
2074 constMethod()->collect_statistics(sz);
2075 }
2076 if (method_data()) {
2077 method_data()->collect_statistics(sz);
2078 }
2079 }
2080 #endif // INCLUDE_SERVICES
2082 // Verification
2084 void Method::verify_on(outputStream* st) {
2085 guarantee(is_method(), "object must be method");
2086 guarantee(constants()->is_constantPool(), "should be constant pool");
2087 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2088 MethodData* md = method_data();
2089 guarantee(md == NULL ||
2090 md->is_methodData(), "should be method data");
2091 }