Wed, 28 Nov 2012 17:50:21 -0500
8003635: NPG: AsynchGetCallTrace broken by Method* virtual call
Summary: Make metaspace::contains be lock free and used to see if something is in metaspace, also compare Method* with vtbl pointer.
Reviewed-by: dholmes, sspitsyn, dcubed, jmasa
1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "code/debugInfoRec.hpp"
28 #include "gc_interface/collectedHeap.inline.hpp"
29 #include "interpreter/bytecodeStream.hpp"
30 #include "interpreter/bytecodeTracer.hpp"
31 #include "interpreter/bytecodes.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "interpreter/oopMapCache.hpp"
34 #include "memory/gcLocker.hpp"
35 #include "memory/generation.hpp"
36 #include "memory/metadataFactory.hpp"
37 #include "memory/oopFactory.hpp"
38 #include "oops/constMethod.hpp"
39 #include "oops/methodData.hpp"
40 #include "oops/method.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "oops/symbol.hpp"
43 #include "prims/jvmtiExport.hpp"
44 #include "prims/jvmtiRedefineClasses.hpp"
45 #include "prims/methodHandles.hpp"
46 #include "prims/nativeLookup.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/compilationPolicy.hpp"
49 #include "runtime/frame.inline.hpp"
50 #include "runtime/handles.inline.hpp"
51 #include "runtime/relocator.hpp"
52 #include "runtime/sharedRuntime.hpp"
53 #include "runtime/signature.hpp"
54 #include "utilities/quickSort.hpp"
55 #include "utilities/xmlstream.hpp"
58 // Implementation of Method
60 Method* Method::allocate(ClassLoaderData* loader_data,
61 int byte_code_size,
62 AccessFlags access_flags,
63 int compressed_line_number_size,
64 int localvariable_table_length,
65 int exception_table_length,
66 int checked_exceptions_length,
67 ConstMethod::MethodType method_type,
68 TRAPS) {
69 assert(!access_flags.is_native() || byte_code_size == 0,
70 "native methods should not contain byte codes");
71 ConstMethod* cm = ConstMethod::allocate(loader_data,
72 byte_code_size,
73 compressed_line_number_size,
74 localvariable_table_length,
75 exception_table_length,
76 checked_exceptions_length,
77 method_type,
78 CHECK_NULL);
80 int size = Method::size(access_flags.is_native());
82 return new (loader_data, size, false, THREAD) Method(cm, access_flags, size);
83 }
85 Method::Method(ConstMethod* xconst,
86 AccessFlags access_flags, int size) {
87 No_Safepoint_Verifier no_safepoint;
88 set_constMethod(xconst);
89 set_access_flags(access_flags);
90 set_method_size(size);
91 set_name_index(0);
92 set_signature_index(0);
93 #ifdef CC_INTERP
94 set_result_index(T_VOID);
95 #endif
96 set_constants(NULL);
97 set_max_stack(0);
98 set_max_locals(0);
99 set_intrinsic_id(vmIntrinsics::_none);
100 set_jfr_towrite(false);
101 set_method_data(NULL);
102 set_interpreter_throwout_count(0);
103 set_vtable_index(Method::garbage_vtable_index);
105 // Fix and bury in Method*
106 set_interpreter_entry(NULL); // sets i2i entry and from_int
107 set_adapter_entry(NULL);
108 clear_code(); // from_c/from_i get set to c2i/i2i
110 if (access_flags.is_native()) {
111 clear_native_function();
112 set_signature_handler(NULL);
113 }
115 NOT_PRODUCT(set_compiled_invocation_count(0);)
116 set_interpreter_invocation_count(0);
117 invocation_counter()->init();
118 backedge_counter()->init();
119 clear_number_of_breakpoints();
121 #ifdef TIERED
122 set_rate(0);
123 set_prev_event_count(0);
124 set_prev_time(0);
125 #endif
126 }
128 // Release Method*. The nmethod will be gone when we get here because
129 // we've walked the code cache.
130 void Method::deallocate_contents(ClassLoaderData* loader_data) {
131 MetadataFactory::free_metadata(loader_data, constMethod());
132 set_constMethod(NULL);
133 MetadataFactory::free_metadata(loader_data, method_data());
134 set_method_data(NULL);
135 // The nmethod will be gone when we get here.
136 if (code() != NULL) _code = NULL;
137 }
139 address Method::get_i2c_entry() {
140 assert(_adapter != NULL, "must have");
141 return _adapter->get_i2c_entry();
142 }
144 address Method::get_c2i_entry() {
145 assert(_adapter != NULL, "must have");
146 return _adapter->get_c2i_entry();
147 }
149 address Method::get_c2i_unverified_entry() {
150 assert(_adapter != NULL, "must have");
151 return _adapter->get_c2i_unverified_entry();
152 }
154 char* Method::name_and_sig_as_C_string() const {
155 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
156 }
158 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
159 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
160 }
162 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
163 const char* klass_name = klass->external_name();
164 int klass_name_len = (int)strlen(klass_name);
165 int method_name_len = method_name->utf8_length();
166 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
167 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
168 strcpy(dest, klass_name);
169 dest[klass_name_len] = '.';
170 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
171 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
172 dest[len] = 0;
173 return dest;
174 }
176 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
177 Symbol* klass_name = klass->name();
178 klass_name->as_klass_external_name(buf, size);
179 int len = (int)strlen(buf);
181 if (len < size - 1) {
182 buf[len++] = '.';
184 method_name->as_C_string(&(buf[len]), size - len);
185 len = (int)strlen(buf);
187 signature->as_C_string(&(buf[len]), size - len);
188 }
190 return buf;
191 }
193 int Method::fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS) {
194 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
195 // access exception table
196 ExceptionTable table(this);
197 int length = table.length();
198 // iterate through all entries sequentially
199 constantPoolHandle pool(THREAD, constants());
200 for (int i = 0; i < length; i ++) {
201 //reacquire the table in case a GC happened
202 ExceptionTable table(this);
203 int beg_bci = table.start_pc(i);
204 int end_bci = table.end_pc(i);
205 assert(beg_bci <= end_bci, "inconsistent exception table");
206 if (beg_bci <= throw_bci && throw_bci < end_bci) {
207 // exception handler bci range covers throw_bci => investigate further
208 int handler_bci = table.handler_pc(i);
209 int klass_index = table.catch_type_index(i);
210 if (klass_index == 0) {
211 return handler_bci;
212 } else if (ex_klass.is_null()) {
213 return handler_bci;
214 } else {
215 // we know the exception class => get the constraint class
216 // this may require loading of the constraint class; if verification
217 // fails or some other exception occurs, return handler_bci
218 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
219 KlassHandle klass = KlassHandle(THREAD, k);
220 assert(klass.not_null(), "klass not loaded");
221 if (ex_klass->is_subtype_of(klass())) {
222 return handler_bci;
223 }
224 }
225 }
226 }
228 return -1;
229 }
231 void Method::mask_for(int bci, InterpreterOopMap* mask) {
233 Thread* myThread = Thread::current();
234 methodHandle h_this(myThread, this);
235 #ifdef ASSERT
236 bool has_capability = myThread->is_VM_thread() ||
237 myThread->is_ConcurrentGC_thread() ||
238 myThread->is_GC_task_thread();
240 if (!has_capability) {
241 if (!VerifyStack && !VerifyLastFrame) {
242 // verify stack calls this outside VM thread
243 warning("oopmap should only be accessed by the "
244 "VM, GC task or CMS threads (or during debugging)");
245 InterpreterOopMap local_mask;
246 method_holder()->mask_for(h_this, bci, &local_mask);
247 local_mask.print();
248 }
249 }
250 #endif
251 method_holder()->mask_for(h_this, bci, mask);
252 return;
253 }
256 int Method::bci_from(address bcp) const {
257 #ifdef ASSERT
258 { ResourceMark rm;
259 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
260 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string()));
261 }
262 #endif
263 return bcp - code_base();
264 }
267 // Return (int)bcx if it appears to be a valid BCI.
268 // Return bci_from((address)bcx) if it appears to be a valid BCP.
269 // Return -1 otherwise.
270 // Used by profiling code, when invalid data is a possibility.
271 // The caller is responsible for validating the Method* itself.
272 int Method::validate_bci_from_bcx(intptr_t bcx) const {
273 // keep bci as -1 if not a valid bci
274 int bci = -1;
275 if (bcx == 0 || (address)bcx == code_base()) {
276 // code_size() may return 0 and we allow 0 here
277 // the method may be native
278 bci = 0;
279 } else if (frame::is_bci(bcx)) {
280 if (bcx < code_size()) {
281 bci = (int)bcx;
282 }
283 } else if (contains((address)bcx)) {
284 bci = (address)bcx - code_base();
285 }
286 // Assert that if we have dodged any asserts, bci is negative.
287 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
288 return bci;
289 }
291 address Method::bcp_from(int bci) const {
292 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci");
293 address bcp = code_base() + bci;
294 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
295 return bcp;
296 }
299 int Method::size(bool is_native) {
300 // If native, then include pointers for native_function and signature_handler
301 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
302 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
303 return align_object_size(header_size() + extra_words);
304 }
307 Symbol* Method::klass_name() const {
308 Klass* k = method_holder();
309 assert(k->is_klass(), "must be klass");
310 InstanceKlass* ik = (InstanceKlass*) k;
311 return ik->name();
312 }
315 void Method::set_interpreter_kind() {
316 int kind = Interpreter::method_kind(this);
317 assert(kind != Interpreter::invalid,
318 "interpreter entry must be valid");
319 set_interpreter_kind(kind);
320 }
323 // Attempt to return method oop to original state. Clear any pointers
324 // (to objects outside the shared spaces). We won't be able to predict
325 // where they should point in a new JVM. Further initialize some
326 // entries now in order allow them to be write protected later.
328 void Method::remove_unshareable_info() {
329 unlink_method();
330 set_interpreter_kind();
331 }
334 bool Method::was_executed_more_than(int n) {
335 // Invocation counter is reset when the Method* is compiled.
336 // If the method has compiled code we therefore assume it has
337 // be excuted more than n times.
338 if (is_accessor() || is_empty_method() || (code() != NULL)) {
339 // interpreter doesn't bump invocation counter of trivial methods
340 // compiler does not bump invocation counter of compiled methods
341 return true;
342 }
343 else if (_invocation_counter.carry() || (method_data() != NULL && method_data()->invocation_counter()->carry())) {
344 // The carry bit is set when the counter overflows and causes
345 // a compilation to occur. We don't know how many times
346 // the counter has been reset, so we simply assume it has
347 // been executed more than n times.
348 return true;
349 } else {
350 return invocation_count() > n;
351 }
352 }
354 #ifndef PRODUCT
355 void Method::print_invocation_count() {
356 if (is_static()) tty->print("static ");
357 if (is_final()) tty->print("final ");
358 if (is_synchronized()) tty->print("synchronized ");
359 if (is_native()) tty->print("native ");
360 method_holder()->name()->print_symbol_on(tty);
361 tty->print(".");
362 name()->print_symbol_on(tty);
363 signature()->print_symbol_on(tty);
365 if (WizardMode) {
366 // dump the size of the byte codes
367 tty->print(" {%d}", code_size());
368 }
369 tty->cr();
371 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
372 tty->print_cr (" invocation_counter: %8d ", invocation_count());
373 tty->print_cr (" backedge_counter: %8d ", backedge_count());
374 if (CountCompiledCalls) {
375 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
376 }
378 }
379 #endif
381 // Build a MethodData* object to hold information about this method
382 // collected in the interpreter.
383 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
384 // Do not profile method if current thread holds the pending list lock,
385 // which avoids deadlock for acquiring the MethodData_lock.
386 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
387 return;
388 }
390 // Grab a lock here to prevent multiple
391 // MethodData*s from being created.
392 MutexLocker ml(MethodData_lock, THREAD);
393 if (method->method_data() == NULL) {
394 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
395 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);
396 method->set_method_data(method_data);
397 if (PrintMethodData && (Verbose || WizardMode)) {
398 ResourceMark rm(THREAD);
399 tty->print("build_interpreter_method_data for ");
400 method->print_name(tty);
401 tty->cr();
402 // At the end of the run, the MDO, full of data, will be dumped.
403 }
404 }
405 }
407 void Method::cleanup_inline_caches() {
408 // The current system doesn't use inline caches in the interpreter
409 // => nothing to do (keep this method around for future use)
410 }
413 int Method::extra_stack_words() {
414 // not an inline function, to avoid a header dependency on Interpreter
415 return extra_stack_entries() * Interpreter::stackElementSize;
416 }
419 void Method::compute_size_of_parameters(Thread *thread) {
420 ArgumentSizeComputer asc(signature());
421 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
422 }
424 #ifdef CC_INTERP
425 void Method::set_result_index(BasicType type) {
426 _result_index = Interpreter::BasicType_as_index(type);
427 }
428 #endif
430 BasicType Method::result_type() const {
431 ResultTypeFinder rtf(signature());
432 return rtf.type();
433 }
436 bool Method::is_empty_method() const {
437 return code_size() == 1
438 && *code_base() == Bytecodes::_return;
439 }
442 bool Method::is_vanilla_constructor() const {
443 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
444 // which only calls the superclass vanilla constructor and possibly does stores of
445 // zero constants to local fields:
446 //
447 // aload_0
448 // invokespecial
449 // indexbyte1
450 // indexbyte2
451 //
452 // followed by an (optional) sequence of:
453 //
454 // aload_0
455 // aconst_null / iconst_0 / fconst_0 / dconst_0
456 // putfield
457 // indexbyte1
458 // indexbyte2
459 //
460 // followed by:
461 //
462 // return
464 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
465 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
466 int size = code_size();
467 // Check if size match
468 if (size == 0 || size % 5 != 0) return false;
469 address cb = code_base();
470 int last = size - 1;
471 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
472 // Does not call superclass default constructor
473 return false;
474 }
475 // Check optional sequence
476 for (int i = 4; i < last; i += 5) {
477 if (cb[i] != Bytecodes::_aload_0) return false;
478 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
479 if (cb[i+2] != Bytecodes::_putfield) return false;
480 }
481 return true;
482 }
485 bool Method::compute_has_loops_flag() {
486 BytecodeStream bcs(this);
487 Bytecodes::Code bc;
489 while ((bc = bcs.next()) >= 0) {
490 switch( bc ) {
491 case Bytecodes::_ifeq:
492 case Bytecodes::_ifnull:
493 case Bytecodes::_iflt:
494 case Bytecodes::_ifle:
495 case Bytecodes::_ifne:
496 case Bytecodes::_ifnonnull:
497 case Bytecodes::_ifgt:
498 case Bytecodes::_ifge:
499 case Bytecodes::_if_icmpeq:
500 case Bytecodes::_if_icmpne:
501 case Bytecodes::_if_icmplt:
502 case Bytecodes::_if_icmpgt:
503 case Bytecodes::_if_icmple:
504 case Bytecodes::_if_icmpge:
505 case Bytecodes::_if_acmpeq:
506 case Bytecodes::_if_acmpne:
507 case Bytecodes::_goto:
508 case Bytecodes::_jsr:
509 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
510 break;
512 case Bytecodes::_goto_w:
513 case Bytecodes::_jsr_w:
514 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
515 break;
516 }
517 }
518 _access_flags.set_loops_flag_init();
519 return _access_flags.has_loops();
520 }
523 bool Method::is_final_method() const {
524 // %%% Should return true for private methods also,
525 // since there is no way to override them.
526 return is_final() || method_holder()->is_final();
527 }
530 bool Method::is_strict_method() const {
531 return is_strict();
532 }
535 bool Method::can_be_statically_bound() const {
536 if (is_final_method()) return true;
537 return vtable_index() == nonvirtual_vtable_index;
538 }
541 bool Method::is_accessor() const {
542 if (code_size() != 5) return false;
543 if (size_of_parameters() != 1) return false;
544 if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
545 if (java_code_at(1) != Bytecodes::_getfield) return false;
546 if (java_code_at(4) != Bytecodes::_areturn &&
547 java_code_at(4) != Bytecodes::_ireturn ) return false;
548 return true;
549 }
552 bool Method::is_initializer() const {
553 return name() == vmSymbols::object_initializer_name() || is_static_initializer();
554 }
556 bool Method::has_valid_initializer_flags() const {
557 return (is_static() ||
558 method_holder()->major_version() < 51);
559 }
561 bool Method::is_static_initializer() const {
562 // For classfiles version 51 or greater, ensure that the clinit method is
563 // static. Non-static methods with the name "<clinit>" are not static
564 // initializers. (older classfiles exempted for backward compatibility)
565 return name() == vmSymbols::class_initializer_name() &&
566 has_valid_initializer_flags();
567 }
570 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) {
571 int length = this_oop->checked_exceptions_length();
572 if (length == 0) { // common case
573 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
574 } else {
575 methodHandle h_this(THREAD, this_oop);
576 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
577 objArrayHandle mirrors (THREAD, m_oop);
578 for (int i = 0; i < length; i++) {
579 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
580 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
581 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
582 mirrors->obj_at_put(i, k->java_mirror());
583 }
584 return mirrors;
585 }
586 };
589 int Method::line_number_from_bci(int bci) const {
590 if (bci == SynchronizationEntryBCI) bci = 0;
591 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
592 int best_bci = 0;
593 int best_line = -1;
595 if (has_linenumber_table()) {
596 // The line numbers are a short array of 2-tuples [start_pc, line_number].
597 // Not necessarily sorted and not necessarily one-to-one.
598 CompressedLineNumberReadStream stream(compressed_linenumber_table());
599 while (stream.read_pair()) {
600 if (stream.bci() == bci) {
601 // perfect match
602 return stream.line();
603 } else {
604 // update best_bci/line
605 if (stream.bci() < bci && stream.bci() >= best_bci) {
606 best_bci = stream.bci();
607 best_line = stream.line();
608 }
609 }
610 }
611 }
612 return best_line;
613 }
616 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
617 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
618 Thread *thread = Thread::current();
619 Symbol* klass_name = constants()->klass_name_at(klass_index);
620 Handle loader(thread, method_holder()->class_loader());
621 Handle prot (thread, method_holder()->protection_domain());
622 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
623 } else {
624 return true;
625 }
626 }
629 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
630 int klass_index = constants()->klass_ref_index_at(refinfo_index);
631 if (must_be_resolved) {
632 // Make sure klass is resolved in constantpool.
633 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
634 }
635 return is_klass_loaded_by_klass_index(klass_index);
636 }
639 void Method::set_native_function(address function, bool post_event_flag) {
640 assert(function != NULL, "use clear_native_function to unregister natives");
641 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
642 address* native_function = native_function_addr();
644 // We can see racers trying to place the same native function into place. Once
645 // is plenty.
646 address current = *native_function;
647 if (current == function) return;
648 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
649 function != NULL) {
650 // native_method_throw_unsatisfied_link_error_entry() should only
651 // be passed when post_event_flag is false.
652 assert(function !=
653 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
654 "post_event_flag mis-match");
656 // post the bind event, and possible change the bind function
657 JvmtiExport::post_native_method_bind(this, &function);
658 }
659 *native_function = function;
660 // This function can be called more than once. We must make sure that we always
661 // use the latest registered method -> check if a stub already has been generated.
662 // If so, we have to make it not_entrant.
663 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
664 if (nm != NULL) {
665 nm->make_not_entrant();
666 }
667 }
670 bool Method::has_native_function() const {
671 if (is_method_handle_intrinsic())
672 return false; // special-cased in SharedRuntime::generate_native_wrapper
673 address func = native_function();
674 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
675 }
678 void Method::clear_native_function() {
679 // Note: is_method_handle_intrinsic() is allowed here.
680 set_native_function(
681 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
682 !native_bind_event_is_interesting);
683 clear_code();
684 }
686 address Method::critical_native_function() {
687 methodHandle mh(this);
688 return NativeLookup::lookup_critical_entry(mh);
689 }
692 void Method::set_signature_handler(address handler) {
693 address* signature_handler = signature_handler_addr();
694 *signature_handler = handler;
695 }
698 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report) {
699 if (PrintCompilation && report) {
700 ttyLocker ttyl;
701 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
702 if (comp_level == CompLevel_all) {
703 tty->print("all levels ");
704 } else {
705 tty->print("levels ");
706 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
707 tty->print("%d ", i);
708 }
709 }
710 this->print_short_name(tty);
711 int size = this->code_size();
712 if (size > 0)
713 tty->print(" (%d bytes)", size);
714 tty->cr();
715 }
716 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
717 ttyLocker ttyl;
718 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'",
719 is_osr ? "osr_" : "", os::current_thread_id());
720 xtty->method(this);
721 xtty->stamp();
722 xtty->end_elem();
723 }
724 }
726 bool Method::is_not_compilable(int comp_level) const {
727 if (number_of_breakpoints() > 0)
728 return true;
729 if (is_method_handle_intrinsic())
730 return !is_synthetic(); // the generated adapters must be compiled
731 if (comp_level == CompLevel_any)
732 return is_not_c1_compilable() || is_not_c2_compilable();
733 if (is_c1_compile(comp_level))
734 return is_not_c1_compilable();
735 if (is_c2_compile(comp_level))
736 return is_not_c2_compilable();
737 return false;
738 }
740 // call this when compiler finds that this method is not compilable
741 void Method::set_not_compilable(int comp_level, bool report) {
742 print_made_not_compilable(comp_level, /*is_osr*/ false, report);
743 if (comp_level == CompLevel_all) {
744 set_not_c1_compilable();
745 set_not_c2_compilable();
746 } else {
747 if (is_c1_compile(comp_level))
748 set_not_c1_compilable();
749 if (is_c2_compile(comp_level))
750 set_not_c2_compilable();
751 }
752 CompilationPolicy::policy()->disable_compilation(this);
753 }
755 bool Method::is_not_osr_compilable(int comp_level) const {
756 if (is_not_compilable(comp_level))
757 return true;
758 if (comp_level == CompLevel_any)
759 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
760 if (is_c1_compile(comp_level))
761 return is_not_c1_osr_compilable();
762 if (is_c2_compile(comp_level))
763 return is_not_c2_osr_compilable();
764 return false;
765 }
767 void Method::set_not_osr_compilable(int comp_level, bool report) {
768 print_made_not_compilable(comp_level, /*is_osr*/ true, report);
769 if (comp_level == CompLevel_all) {
770 set_not_c1_osr_compilable();
771 set_not_c2_osr_compilable();
772 } else {
773 if (is_c1_compile(comp_level))
774 set_not_c1_osr_compilable();
775 if (is_c2_compile(comp_level))
776 set_not_c2_osr_compilable();
777 }
778 CompilationPolicy::policy()->disable_compilation(this);
779 }
781 // Revert to using the interpreter and clear out the nmethod
782 void Method::clear_code() {
784 // this may be NULL if c2i adapters have not been made yet
785 // Only should happen at allocate time.
786 if (_adapter == NULL) {
787 _from_compiled_entry = NULL;
788 } else {
789 _from_compiled_entry = _adapter->get_c2i_entry();
790 }
791 OrderAccess::storestore();
792 _from_interpreted_entry = _i2i_entry;
793 OrderAccess::storestore();
794 _code = NULL;
795 }
797 // Called by class data sharing to remove any entry points (which are not shared)
798 void Method::unlink_method() {
799 _code = NULL;
800 _i2i_entry = NULL;
801 _from_interpreted_entry = NULL;
802 if (is_native()) {
803 *native_function_addr() = NULL;
804 set_signature_handler(NULL);
805 }
806 NOT_PRODUCT(set_compiled_invocation_count(0);)
807 invocation_counter()->reset();
808 backedge_counter()->reset();
809 _adapter = NULL;
810 _from_compiled_entry = NULL;
811 assert(_method_data == NULL, "unexpected method data?");
812 set_method_data(NULL);
813 set_interpreter_throwout_count(0);
814 set_interpreter_invocation_count(0);
815 }
817 // Called when the method_holder is getting linked. Setup entrypoints so the method
818 // is ready to be called from interpreter, compiler, and vtables.
819 void Method::link_method(methodHandle h_method, TRAPS) {
820 // If the code cache is full, we may reenter this function for the
821 // leftover methods that weren't linked.
822 if (_i2i_entry != NULL) return;
824 assert(_adapter == NULL, "init'd to NULL" );
825 assert( _code == NULL, "nothing compiled yet" );
827 // Setup interpreter entrypoint
828 assert(this == h_method(), "wrong h_method()" );
829 address entry = Interpreter::entry_for_method(h_method);
830 assert(entry != NULL, "interpreter entry must be non-null");
831 // Sets both _i2i_entry and _from_interpreted_entry
832 set_interpreter_entry(entry);
833 if (is_native() && !is_method_handle_intrinsic()) {
834 set_native_function(
835 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
836 !native_bind_event_is_interesting);
837 }
839 // Setup compiler entrypoint. This is made eagerly, so we do not need
840 // special handling of vtables. An alternative is to make adapters more
841 // lazily by calling make_adapter() from from_compiled_entry() for the
842 // normal calls. For vtable calls life gets more complicated. When a
843 // call-site goes mega-morphic we need adapters in all methods which can be
844 // called from the vtable. We need adapters on such methods that get loaded
845 // later. Ditto for mega-morphic itable calls. If this proves to be a
846 // problem we'll make these lazily later.
847 (void) make_adapters(h_method, CHECK);
849 // ONLY USE the h_method now as make_adapter may have blocked
851 }
853 address Method::make_adapters(methodHandle mh, TRAPS) {
854 // Adapters for compiled code are made eagerly here. They are fairly
855 // small (generally < 100 bytes) and quick to make (and cached and shared)
856 // so making them eagerly shouldn't be too expensive.
857 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
858 if (adapter == NULL ) {
859 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
860 }
862 mh->set_adapter_entry(adapter);
863 mh->_from_compiled_entry = adapter->get_c2i_entry();
864 return adapter->get_c2i_entry();
865 }
867 // The verified_code_entry() must be called when a invoke is resolved
868 // on this method.
870 // It returns the compiled code entry point, after asserting not null.
871 // This function is called after potential safepoints so that nmethod
872 // or adapter that it points to is still live and valid.
873 // This function must not hit a safepoint!
874 address Method::verified_code_entry() {
875 debug_only(No_Safepoint_Verifier nsv;)
876 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
877 if (code == NULL && UseCodeCacheFlushing) {
878 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this);
879 if (saved_code != NULL) {
880 methodHandle method(this);
881 assert( ! saved_code->is_osr_method(), "should not get here for osr" );
882 set_code( method, saved_code );
883 }
884 }
886 assert(_from_compiled_entry != NULL, "must be set");
887 return _from_compiled_entry;
888 }
890 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
891 // (could be racing a deopt).
892 // Not inline to avoid circular ref.
893 bool Method::check_code() const {
894 // cached in a register or local. There's a race on the value of the field.
895 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
896 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
897 }
899 // Install compiled code. Instantly it can execute.
900 void Method::set_code(methodHandle mh, nmethod *code) {
901 assert( code, "use clear_code to remove code" );
902 assert( mh->check_code(), "" );
904 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
906 // These writes must happen in this order, because the interpreter will
907 // directly jump to from_interpreted_entry which jumps to an i2c adapter
908 // which jumps to _from_compiled_entry.
909 mh->_code = code; // Assign before allowing compiled code to exec
911 int comp_level = code->comp_level();
912 // In theory there could be a race here. In practice it is unlikely
913 // and not worth worrying about.
914 if (comp_level > mh->highest_comp_level()) {
915 mh->set_highest_comp_level(comp_level);
916 }
918 OrderAccess::storestore();
919 #ifdef SHARK
920 mh->_from_interpreted_entry = code->insts_begin();
921 #else //!SHARK
922 mh->_from_compiled_entry = code->verified_entry_point();
923 OrderAccess::storestore();
924 // Instantly compiled code can execute.
925 if (!mh->is_method_handle_intrinsic())
926 mh->_from_interpreted_entry = mh->get_i2c_entry();
927 #endif //!SHARK
928 }
931 bool Method::is_overridden_in(Klass* k) const {
932 InstanceKlass* ik = InstanceKlass::cast(k);
934 if (ik->is_interface()) return false;
936 // If method is an interface, we skip it - except if it
937 // is a miranda method
938 if (method_holder()->is_interface()) {
939 // Check that method is not a miranda method
940 if (ik->lookup_method(name(), signature()) == NULL) {
941 // No implementation exist - so miranda method
942 return false;
943 }
944 return true;
945 }
947 assert(ik->is_subclass_of(method_holder()), "should be subklass");
948 assert(ik->vtable() != NULL, "vtable should exist");
949 if (vtable_index() == nonvirtual_vtable_index) {
950 return false;
951 } else {
952 Method* vt_m = ik->method_at_vtable(vtable_index());
953 return vt_m != this;
954 }
955 }
958 // give advice about whether this Method* should be cached or not
959 bool Method::should_not_be_cached() const {
960 if (is_old()) {
961 // This method has been redefined. It is either EMCP or obsolete
962 // and we don't want to cache it because that would pin the method
963 // down and prevent it from being collectible if and when it
964 // finishes executing.
965 return true;
966 }
968 // caching this method should be just fine
969 return false;
970 }
972 // Constant pool structure for invoke methods:
973 enum {
974 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
975 _imcp_invoke_signature, // utf8: (variable Symbol*)
976 _imcp_limit
977 };
979 // Test if this method is an MH adapter frame generated by Java code.
980 // Cf. java/lang/invoke/InvokerBytecodeGenerator
981 bool Method::is_compiled_lambda_form() const {
982 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
983 }
985 // Test if this method is an internal MH primitive method.
986 bool Method::is_method_handle_intrinsic() const {
987 vmIntrinsics::ID iid = intrinsic_id();
988 return (MethodHandles::is_signature_polymorphic(iid) &&
989 MethodHandles::is_signature_polymorphic_intrinsic(iid));
990 }
992 bool Method::has_member_arg() const {
993 vmIntrinsics::ID iid = intrinsic_id();
994 return (MethodHandles::is_signature_polymorphic(iid) &&
995 MethodHandles::has_member_arg(iid));
996 }
998 // Make an instance of a signature-polymorphic internal MH primitive.
999 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1000 Symbol* signature,
1001 TRAPS) {
1002 ResourceMark rm;
1003 methodHandle empty;
1005 KlassHandle holder = SystemDictionary::MethodHandle_klass();
1006 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1007 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1008 if (TraceMethodHandles) {
1009 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1010 }
1012 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1013 name->increment_refcount();
1014 signature->increment_refcount();
1016 int cp_length = _imcp_limit;
1017 ClassLoaderData* loader_data = holder->class_loader_data();
1018 constantPoolHandle cp;
1019 {
1020 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1021 cp = constantPoolHandle(THREAD, cp_oop);
1022 }
1023 cp->set_pool_holder(InstanceKlass::cast(holder()));
1024 cp->symbol_at_put(_imcp_invoke_name, name);
1025 cp->symbol_at_put(_imcp_invoke_signature, signature);
1026 cp->set_preresolution();
1028 // decide on access bits: public or not?
1029 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1030 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1031 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1032 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1034 methodHandle m;
1035 {
1036 Method* m_oop = Method::allocate(loader_data, 0, accessFlags_from(flags_bits),
1037 0, 0, 0, 0, ConstMethod::NORMAL, CHECK_(empty));
1038 m = methodHandle(THREAD, m_oop);
1039 }
1040 m->set_constants(cp());
1041 m->set_name_index(_imcp_invoke_name);
1042 m->set_signature_index(_imcp_invoke_signature);
1043 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1044 assert(m->signature() == signature, "");
1045 #ifdef CC_INTERP
1046 ResultTypeFinder rtf(signature);
1047 m->set_result_index(rtf.type());
1048 #endif
1049 m->compute_size_of_parameters(THREAD);
1050 m->init_intrinsic_id();
1051 assert(m->is_method_handle_intrinsic(), "");
1052 #ifdef ASSERT
1053 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1054 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1055 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1056 #endif //ASSERT
1058 // Finally, set up its entry points.
1059 assert(m->can_be_statically_bound(), "");
1060 m->set_vtable_index(Method::nonvirtual_vtable_index);
1061 m->link_method(m, CHECK_(empty));
1063 if (TraceMethodHandles && (Verbose || WizardMode))
1064 m->print_on(tty);
1066 return m;
1067 }
1069 Klass* Method::check_non_bcp_klass(Klass* klass) {
1070 if (klass != NULL && klass->class_loader() != NULL) {
1071 if (klass->oop_is_objArray())
1072 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1073 return klass;
1074 }
1075 return NULL;
1076 }
1079 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1080 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1081 // Code below does not work for native methods - they should never get rewritten anyway
1082 assert(!m->is_native(), "cannot rewrite native methods");
1083 // Allocate new Method*
1084 AccessFlags flags = m->access_flags();
1085 int checked_exceptions_len = m->checked_exceptions_length();
1086 int localvariable_len = m->localvariable_table_length();
1087 int exception_table_len = m->exception_table_length();
1089 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1090 Method* newm_oop = Method::allocate(loader_data,
1091 new_code_length,
1092 flags,
1093 new_compressed_linenumber_size,
1094 localvariable_len,
1095 exception_table_len,
1096 checked_exceptions_len,
1097 m->method_type(),
1098 CHECK_(methodHandle()));
1099 methodHandle newm (THREAD, newm_oop);
1100 int new_method_size = newm->method_size();
1102 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1103 ConstMethod* newcm = newm->constMethod();
1104 int new_const_method_size = newm->constMethod()->size();
1106 memcpy(newm(), m(), sizeof(Method));
1108 // Create shallow copy of ConstMethod.
1109 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1111 // Reset correct method/const method, method size, and parameter info
1112 newm->set_constMethod(newcm);
1113 newm->constMethod()->set_code_size(new_code_length);
1114 newm->constMethod()->set_constMethod_size(new_const_method_size);
1115 newm->set_method_size(new_method_size);
1116 assert(newm->code_size() == new_code_length, "check");
1117 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1118 assert(newm->exception_table_length() == exception_table_len, "check");
1119 assert(newm->localvariable_table_length() == localvariable_len, "check");
1120 // Copy new byte codes
1121 memcpy(newm->code_base(), new_code, new_code_length);
1122 // Copy line number table
1123 if (new_compressed_linenumber_size > 0) {
1124 memcpy(newm->compressed_linenumber_table(),
1125 new_compressed_linenumber_table,
1126 new_compressed_linenumber_size);
1127 }
1128 // Copy checked_exceptions
1129 if (checked_exceptions_len > 0) {
1130 memcpy(newm->checked_exceptions_start(),
1131 m->checked_exceptions_start(),
1132 checked_exceptions_len * sizeof(CheckedExceptionElement));
1133 }
1134 // Copy exception table
1135 if (exception_table_len > 0) {
1136 memcpy(newm->exception_table_start(),
1137 m->exception_table_start(),
1138 exception_table_len * sizeof(ExceptionTableElement));
1139 }
1140 // Copy local variable number table
1141 if (localvariable_len > 0) {
1142 memcpy(newm->localvariable_table_start(),
1143 m->localvariable_table_start(),
1144 localvariable_len * sizeof(LocalVariableTableElement));
1145 }
1146 // Copy stackmap table
1147 if (m->has_stackmap_table()) {
1148 int code_attribute_length = m->stackmap_data()->length();
1149 Array<u1>* stackmap_data =
1150 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1151 memcpy((void*)stackmap_data->adr_at(0),
1152 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1153 newm->set_stackmap_data(stackmap_data);
1154 }
1156 return newm;
1157 }
1159 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
1160 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1161 // because we are not loading from core libraries
1162 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1163 // which does not use the class default class loader so we check for its loader here
1164 if ((InstanceKlass::cast(holder)->class_loader() != NULL) &&
1165 InstanceKlass::cast(holder)->class_loader()->klass()->name() != vmSymbols::sun_misc_Launcher_ExtClassLoader()) {
1166 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1167 }
1169 // see if the klass name is well-known:
1170 Symbol* klass_name = InstanceKlass::cast(holder)->name();
1171 return vmSymbols::find_sid(klass_name);
1172 }
1174 void Method::init_intrinsic_id() {
1175 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1176 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1177 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1178 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1180 // the klass name is well-known:
1181 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1182 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1184 // ditto for method and signature:
1185 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1186 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1187 && name_id == vmSymbols::NO_SID)
1188 return;
1189 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1190 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1191 && sig_id == vmSymbols::NO_SID) return;
1192 jshort flags = access_flags().as_short();
1194 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1195 if (id != vmIntrinsics::_none) {
1196 set_intrinsic_id(id);
1197 return;
1198 }
1200 // A few slightly irregular cases:
1201 switch (klass_id) {
1202 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1203 // Second chance: check in regular Math.
1204 switch (name_id) {
1205 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1206 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1207 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1208 // pretend it is the corresponding method in the non-strict class:
1209 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1210 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1211 break;
1212 }
1213 break;
1215 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1216 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1217 if (!is_native()) break;
1218 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1219 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1220 id = vmIntrinsics::_none;
1221 break;
1222 }
1224 if (id != vmIntrinsics::_none) {
1225 // Set up its iid. It is an alias method.
1226 set_intrinsic_id(id);
1227 return;
1228 }
1229 }
1231 // These two methods are static since a GC may move the Method
1232 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1233 if (THREAD->is_Compiler_thread()) {
1234 // There is nothing useful this routine can do from within the Compile thread.
1235 // Hopefully, the signature contains only well-known classes.
1236 // We could scan for this and return true/false, but the caller won't care.
1237 return false;
1238 }
1239 bool sig_is_loaded = true;
1240 Handle class_loader(THREAD, m->method_holder()->class_loader());
1241 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1242 ResourceMark rm(THREAD);
1243 Symbol* signature = m->signature();
1244 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1245 if (ss.is_object()) {
1246 Symbol* sym = ss.as_symbol(CHECK_(false));
1247 Symbol* name = sym;
1248 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1249 protection_domain, THREAD);
1250 // We are loading classes eagerly. If a ClassNotFoundException or
1251 // a LinkageError was generated, be sure to ignore it.
1252 if (HAS_PENDING_EXCEPTION) {
1253 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1254 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1255 CLEAR_PENDING_EXCEPTION;
1256 } else {
1257 return false;
1258 }
1259 }
1260 if( klass == NULL) { sig_is_loaded = false; }
1261 }
1262 }
1263 return sig_is_loaded;
1264 }
1266 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1267 Handle class_loader(THREAD, m->method_holder()->class_loader());
1268 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1269 ResourceMark rm(THREAD);
1270 Symbol* signature = m->signature();
1271 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1272 if (ss.type() == T_OBJECT) {
1273 Symbol* name = ss.as_symbol_or_null();
1274 if (name == NULL) return true;
1275 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1276 if (klass == NULL) return true;
1277 }
1278 }
1279 return false;
1280 }
1282 // Exposed so field engineers can debug VM
1283 void Method::print_short_name(outputStream* st) {
1284 ResourceMark rm;
1285 #ifdef PRODUCT
1286 st->print(" %s::", method_holder()->external_name());
1287 #else
1288 st->print(" %s::", method_holder()->internal_name());
1289 #endif
1290 name()->print_symbol_on(st);
1291 if (WizardMode) signature()->print_symbol_on(st);
1292 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1293 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1294 }
1296 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1297 static void reorder_based_on_method_index(Array<Method*>* methods,
1298 Array<AnnotationArray*>* annotations,
1299 GrowableArray<AnnotationArray*>* temp_array) {
1300 if (annotations == NULL) {
1301 return;
1302 }
1304 int length = methods->length();
1305 int i;
1306 // Copy to temp array
1307 temp_array->clear();
1308 for (i = 0; i < length; i++) {
1309 temp_array->append(annotations->at(i));
1310 }
1312 // Copy back using old method indices
1313 for (i = 0; i < length; i++) {
1314 Method* m = methods->at(i);
1315 annotations->at_put(i, temp_array->at(m->method_idnum()));
1316 }
1317 }
1319 // Comparer for sorting an object array containing
1320 // Method*s.
1321 static int method_comparator(Method* a, Method* b) {
1322 return a->name()->fast_compare(b->name());
1323 }
1325 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1326 void Method::sort_methods(Array<Method*>* methods,
1327 Array<AnnotationArray*>* methods_annotations,
1328 Array<AnnotationArray*>* methods_parameter_annotations,
1329 Array<AnnotationArray*>* methods_default_annotations,
1330 bool idempotent) {
1331 int length = methods->length();
1332 if (length > 1) {
1333 bool do_annotations = false;
1334 if (methods_annotations != NULL ||
1335 methods_parameter_annotations != NULL ||
1336 methods_default_annotations != NULL) {
1337 do_annotations = true;
1338 }
1339 if (do_annotations) {
1340 // Remember current method ordering so we can reorder annotations
1341 for (int i = 0; i < length; i++) {
1342 Method* m = methods->at(i);
1343 m->set_method_idnum(i);
1344 }
1345 }
1346 {
1347 No_Safepoint_Verifier nsv;
1348 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1349 }
1351 // Sort annotations if necessary
1352 assert(methods_annotations == NULL || methods_annotations->length() == methods->length(), "");
1353 assert(methods_parameter_annotations == NULL || methods_parameter_annotations->length() == methods->length(), "");
1354 assert(methods_default_annotations == NULL || methods_default_annotations->length() == methods->length(), "");
1355 if (do_annotations) {
1356 ResourceMark rm;
1357 // Allocate temporary storage
1358 GrowableArray<AnnotationArray*>* temp_array = new GrowableArray<AnnotationArray*>(length);
1359 reorder_based_on_method_index(methods, methods_annotations, temp_array);
1360 reorder_based_on_method_index(methods, methods_parameter_annotations, temp_array);
1361 reorder_based_on_method_index(methods, methods_default_annotations, temp_array);
1362 }
1364 // Reset method ordering
1365 for (int i = 0; i < length; i++) {
1366 Method* m = methods->at(i);
1367 m->set_method_idnum(i);
1368 }
1369 }
1370 }
1373 //-----------------------------------------------------------------------------------
1374 // Non-product code
1376 #ifndef PRODUCT
1377 class SignatureTypePrinter : public SignatureTypeNames {
1378 private:
1379 outputStream* _st;
1380 bool _use_separator;
1382 void type_name(const char* name) {
1383 if (_use_separator) _st->print(", ");
1384 _st->print(name);
1385 _use_separator = true;
1386 }
1388 public:
1389 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1390 _st = st;
1391 _use_separator = false;
1392 }
1394 void print_parameters() { _use_separator = false; iterate_parameters(); }
1395 void print_returntype() { _use_separator = false; iterate_returntype(); }
1396 };
1399 void Method::print_name(outputStream* st) {
1400 Thread *thread = Thread::current();
1401 ResourceMark rm(thread);
1402 SignatureTypePrinter sig(signature(), st);
1403 st->print("%s ", is_static() ? "static" : "virtual");
1404 sig.print_returntype();
1405 st->print(" %s.", method_holder()->internal_name());
1406 name()->print_symbol_on(st);
1407 st->print("(");
1408 sig.print_parameters();
1409 st->print(")");
1410 }
1413 void Method::print_codes_on(outputStream* st) const {
1414 print_codes_on(0, code_size(), st);
1415 }
1417 void Method::print_codes_on(int from, int to, outputStream* st) const {
1418 Thread *thread = Thread::current();
1419 ResourceMark rm(thread);
1420 methodHandle mh (thread, (Method*)this);
1421 BytecodeStream s(mh);
1422 s.set_interval(from, to);
1423 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1424 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1425 }
1426 #endif // not PRODUCT
1429 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1430 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1431 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1432 // as end-of-stream terminator.
1434 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1435 // bci and line number does not compress into single byte.
1436 // Write out escape character and use regular compression for bci and line number.
1437 write_byte((jubyte)0xFF);
1438 write_signed_int(bci_delta);
1439 write_signed_int(line_delta);
1440 }
1442 // See comment in method.hpp which explains why this exists.
1443 #if defined(_M_AMD64) && _MSC_VER >= 1400
1444 #pragma optimize("", off)
1445 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1446 write_pair_inline(bci, line);
1447 }
1448 #pragma optimize("", on)
1449 #endif
1451 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1452 _bci = 0;
1453 _line = 0;
1454 };
1457 bool CompressedLineNumberReadStream::read_pair() {
1458 jubyte next = read_byte();
1459 // Check for terminator
1460 if (next == 0) return false;
1461 if (next == 0xFF) {
1462 // Escape character, regular compression used
1463 _bci += read_signed_int();
1464 _line += read_signed_int();
1465 } else {
1466 // Single byte compression used
1467 _bci += next >> 3;
1468 _line += next & 0x7;
1469 }
1470 return true;
1471 }
1474 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1475 BreakpointInfo* bp = method_holder()->breakpoints();
1476 for (; bp != NULL; bp = bp->next()) {
1477 if (bp->match(this, bci)) {
1478 return bp->orig_bytecode();
1479 }
1480 }
1481 ShouldNotReachHere();
1482 return Bytecodes::_shouldnotreachhere;
1483 }
1485 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1486 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1487 BreakpointInfo* bp = method_holder()->breakpoints();
1488 for (; bp != NULL; bp = bp->next()) {
1489 if (bp->match(this, bci)) {
1490 bp->set_orig_bytecode(code);
1491 // and continue, in case there is more than one
1492 }
1493 }
1494 }
1496 void Method::set_breakpoint(int bci) {
1497 InstanceKlass* ik = method_holder();
1498 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1499 bp->set_next(ik->breakpoints());
1500 ik->set_breakpoints(bp);
1501 // do this last:
1502 bp->set(this);
1503 }
1505 static void clear_matches(Method* m, int bci) {
1506 InstanceKlass* ik = m->method_holder();
1507 BreakpointInfo* prev_bp = NULL;
1508 BreakpointInfo* next_bp;
1509 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1510 next_bp = bp->next();
1511 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1512 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1513 // do this first:
1514 bp->clear(m);
1515 // unhook it
1516 if (prev_bp != NULL)
1517 prev_bp->set_next(next_bp);
1518 else
1519 ik->set_breakpoints(next_bp);
1520 delete bp;
1521 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1522 // at same location. So we have multiple matching (method_index and bci)
1523 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1524 // breakpoint for clear_breakpoint request and keep all other method versions
1525 // BreakpointInfo for future clear_breakpoint request.
1526 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1527 // which is being called when class is unloaded. We delete all the Breakpoint
1528 // information for all versions of method. We may not correctly restore the original
1529 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1530 // so these methods won't be used anymore.
1531 if (bci >= 0) {
1532 break;
1533 }
1534 } else {
1535 // This one is a keeper.
1536 prev_bp = bp;
1537 }
1538 }
1539 }
1541 void Method::clear_breakpoint(int bci) {
1542 assert(bci >= 0, "");
1543 clear_matches(this, bci);
1544 }
1546 void Method::clear_all_breakpoints() {
1547 clear_matches(this, -1);
1548 }
1551 int Method::invocation_count() {
1552 if (TieredCompilation) {
1553 MethodData* const mdo = method_data();
1554 if (invocation_counter()->carry() || ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1555 return InvocationCounter::count_limit;
1556 } else {
1557 return invocation_counter()->count() + ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1558 }
1559 } else {
1560 return invocation_counter()->count();
1561 }
1562 }
1564 int Method::backedge_count() {
1565 if (TieredCompilation) {
1566 MethodData* const mdo = method_data();
1567 if (backedge_counter()->carry() || ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1568 return InvocationCounter::count_limit;
1569 } else {
1570 return backedge_counter()->count() + ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1571 }
1572 } else {
1573 return backedge_counter()->count();
1574 }
1575 }
1577 int Method::highest_comp_level() const {
1578 MethodData* mdo = method_data();
1579 if (mdo != NULL) {
1580 return mdo->highest_comp_level();
1581 } else {
1582 return CompLevel_none;
1583 }
1584 }
1586 int Method::highest_osr_comp_level() const {
1587 MethodData* mdo = method_data();
1588 if (mdo != NULL) {
1589 return mdo->highest_osr_comp_level();
1590 } else {
1591 return CompLevel_none;
1592 }
1593 }
1595 void Method::set_highest_comp_level(int level) {
1596 MethodData* mdo = method_data();
1597 if (mdo != NULL) {
1598 mdo->set_highest_comp_level(level);
1599 }
1600 }
1602 void Method::set_highest_osr_comp_level(int level) {
1603 MethodData* mdo = method_data();
1604 if (mdo != NULL) {
1605 mdo->set_highest_osr_comp_level(level);
1606 }
1607 }
1609 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1610 _bci = bci;
1611 _name_index = m->name_index();
1612 _signature_index = m->signature_index();
1613 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1614 if (_orig_bytecode == Bytecodes::_breakpoint)
1615 _orig_bytecode = m->orig_bytecode_at(_bci);
1616 _next = NULL;
1617 }
1619 void BreakpointInfo::set(Method* method) {
1620 #ifdef ASSERT
1621 {
1622 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1623 if (code == Bytecodes::_breakpoint)
1624 code = method->orig_bytecode_at(_bci);
1625 assert(orig_bytecode() == code, "original bytecode must be the same");
1626 }
1627 #endif
1628 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1629 method->incr_number_of_breakpoints();
1630 SystemDictionary::notice_modification();
1631 {
1632 // Deoptimize all dependents on this method
1633 Thread *thread = Thread::current();
1634 HandleMark hm(thread);
1635 methodHandle mh(thread, method);
1636 Universe::flush_dependents_on_method(mh);
1637 }
1638 }
1640 void BreakpointInfo::clear(Method* method) {
1641 *method->bcp_from(_bci) = orig_bytecode();
1642 assert(method->number_of_breakpoints() > 0, "must not go negative");
1643 method->decr_number_of_breakpoints();
1644 }
1646 // jmethodID handling
1648 // This is a block allocating object, sort of like JNIHandleBlock, only a
1649 // lot simpler. There aren't many of these, they aren't long, they are rarely
1650 // deleted and so we can do some suboptimal things.
1651 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1652 // never get rid of it.
1653 // It would be nice to be able to parameterize the number of methods for
1654 // the null_class_loader but then we'd have to turn this and ClassLoaderData
1655 // into templates.
1657 // I feel like this brain dead class should exist somewhere in the STL
1659 class JNIMethodBlock : public CHeapObj<mtClass> {
1660 enum { number_of_methods = 8 };
1662 Method* _methods[number_of_methods];
1663 int _top;
1664 JNIMethodBlock* _next;
1665 public:
1666 static Method* const _free_method;
1668 JNIMethodBlock() : _next(NULL), _top(0) {
1669 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method;
1670 }
1672 Method** add_method(Method* m) {
1673 if (_top < number_of_methods) {
1674 // top points to the next free entry.
1675 int i = _top;
1676 _methods[i] = m;
1677 _top++;
1678 return &_methods[i];
1679 } else if (_top == number_of_methods) {
1680 // if the next free entry ran off the block see if there's a free entry
1681 for (int i = 0; i< number_of_methods; i++) {
1682 if (_methods[i] == _free_method) {
1683 _methods[i] = m;
1684 return &_methods[i];
1685 }
1686 }
1687 // Only check each block once for frees. They're very unlikely.
1688 // Increment top past the end of the block.
1689 _top++;
1690 }
1691 // need to allocate a next block.
1692 if (_next == NULL) {
1693 _next = new JNIMethodBlock();
1694 }
1695 return _next->add_method(m);
1696 }
1698 bool contains(Method** m) {
1699 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1700 for (int i = 0; i< number_of_methods; i++) {
1701 if (&(b->_methods[i]) == m) {
1702 return true;
1703 }
1704 }
1705 }
1706 return false; // not found
1707 }
1709 // Doesn't really destroy it, just marks it as free so it can be reused.
1710 void destroy_method(Method** m) {
1711 #ifdef ASSERT
1712 assert(contains(m), "should be a methodID");
1713 #endif // ASSERT
1714 *m = _free_method;
1715 }
1717 // During class unloading the methods are cleared, which is different
1718 // than freed.
1719 void clear_all_methods() {
1720 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1721 for (int i = 0; i< number_of_methods; i++) {
1722 _methods[i] = NULL;
1723 }
1724 }
1725 }
1726 #ifndef PRODUCT
1727 int count_methods() {
1728 // count all allocated methods
1729 int count = 0;
1730 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
1731 for (int i = 0; i< number_of_methods; i++) {
1732 if (_methods[i] != _free_method) count++;
1733 }
1734 }
1735 return count;
1736 }
1737 #endif // PRODUCT
1738 };
1740 // Something that can't be mistaken for an address or a markOop
1741 Method* const JNIMethodBlock::_free_method = (Method*)55;
1743 // Add a method id to the jmethod_ids
1744 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
1745 ClassLoaderData* cld = loader_data;
1747 if (!SafepointSynchronize::is_at_safepoint()) {
1748 // Have to add jmethod_ids() to class loader data thread-safely.
1749 // Also have to add the method to the list safely, which the cld lock
1750 // protects as well.
1751 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
1752 if (cld->jmethod_ids() == NULL) {
1753 cld->set_jmethod_ids(new JNIMethodBlock());
1754 }
1755 // jmethodID is a pointer to Method*
1756 return (jmethodID)cld->jmethod_ids()->add_method(m);
1757 } else {
1758 // At safepoint, we are single threaded and can set this.
1759 if (cld->jmethod_ids() == NULL) {
1760 cld->set_jmethod_ids(new JNIMethodBlock());
1761 }
1762 // jmethodID is a pointer to Method*
1763 return (jmethodID)cld->jmethod_ids()->add_method(m);
1764 }
1765 }
1767 // Mark a jmethodID as free. This is called when there is a data race in
1768 // InstanceKlass while creating the jmethodID cache.
1769 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
1770 ClassLoaderData* cld = loader_data;
1771 Method** ptr = (Method**)m;
1772 assert(cld->jmethod_ids() != NULL, "should have method handles");
1773 cld->jmethod_ids()->destroy_method(ptr);
1774 }
1776 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
1777 // Can't assert the method_holder is the same because the new method has the
1778 // scratch method holder.
1779 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
1780 == new_method->method_holder()->class_loader(),
1781 "changing to a different class loader");
1782 // Just change the method in place, jmethodID pointer doesn't change.
1783 *((Method**)jmid) = new_method;
1784 }
1786 bool Method::is_method_id(jmethodID mid) {
1787 Method* m = resolve_jmethod_id(mid);
1788 assert(m != NULL, "should be called with non-null method");
1789 InstanceKlass* ik = m->method_holder();
1790 ClassLoaderData* cld = ik->class_loader_data();
1791 if (cld->jmethod_ids() == NULL) return false;
1792 return (cld->jmethod_ids()->contains((Method**)mid));
1793 }
1795 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
1796 if (mid == NULL) return NULL;
1797 Method* o = resolve_jmethod_id(mid);
1798 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
1799 return NULL;
1800 }
1801 return o;
1802 };
1804 void Method::set_on_stack(const bool value) {
1805 // Set both the method itself and its constant pool. The constant pool
1806 // on stack means some method referring to it is also on the stack.
1807 _access_flags.set_on_stack(value);
1808 constants()->set_on_stack(value);
1809 if (value) MetadataOnStackMark::record(this);
1810 }
1812 // Called when the class loader is unloaded to make all methods weak.
1813 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1814 loader_data->jmethod_ids()->clear_all_methods();
1815 }
1818 // Check that this pointer is valid by checking that the vtbl pointer matches
1819 bool Method::is_valid_method() const {
1820 if (this == NULL) {
1821 return false;
1822 } else if (!is_metaspace_object()) {
1823 return false;
1824 } else {
1825 Method m;
1826 // This assumes that the vtbl pointer is the first word of a C++ object.
1827 // This assumption is also in universe.cpp patch_klass_vtble
1828 void* vtbl2 = dereference_vptr((void*)&m);
1829 void* this_vtbl = dereference_vptr((void*)this);
1830 return vtbl2 == this_vtbl;
1831 }
1832 }
1834 #ifndef PRODUCT
1835 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1836 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1837 }
1838 #endif // PRODUCT
1841 // Printing
1843 #ifndef PRODUCT
1845 void Method::print_on(outputStream* st) const {
1846 ResourceMark rm;
1847 assert(is_method(), "must be method");
1848 st->print_cr(internal_name());
1849 // get the effect of PrintOopAddress, always, for methods:
1850 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this);
1851 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
1852 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants());
1853 constants()->print_value_on(st); st->cr();
1854 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
1855 st->print (" - name: "); name()->print_value_on(st); st->cr();
1856 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
1857 st->print_cr(" - max stack: %d", max_stack());
1858 st->print_cr(" - max locals: %d", max_locals());
1859 st->print_cr(" - size of params: %d", size_of_parameters());
1860 st->print_cr(" - method size: %d", method_size());
1861 if (intrinsic_id() != vmIntrinsics::_none)
1862 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
1863 if (highest_comp_level() != CompLevel_none)
1864 st->print_cr(" - highest level: %d", highest_comp_level());
1865 st->print_cr(" - vtable index: %d", _vtable_index);
1866 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry());
1867 st->print( " - adapters: ");
1868 AdapterHandlerEntry* a = ((Method*)this)->adapter();
1869 if (a == NULL)
1870 st->print_cr(INTPTR_FORMAT, a);
1871 else
1872 a->print_adapter_on(st);
1873 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry());
1874 st->print_cr(" - code size: %d", code_size());
1875 if (code_size() != 0) {
1876 st->print_cr(" - code start: " INTPTR_FORMAT, code_base());
1877 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size());
1878 }
1879 if (method_data() != NULL) {
1880 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data());
1881 }
1882 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
1883 if (checked_exceptions_length() > 0) {
1884 CheckedExceptionElement* table = checked_exceptions_start();
1885 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table);
1886 if (Verbose) {
1887 for (int i = 0; i < checked_exceptions_length(); i++) {
1888 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
1889 }
1890 }
1891 }
1892 if (has_linenumber_table()) {
1893 u_char* table = compressed_linenumber_table();
1894 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table);
1895 if (Verbose) {
1896 CompressedLineNumberReadStream stream(table);
1897 while (stream.read_pair()) {
1898 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
1899 }
1900 }
1901 }
1902 st->print_cr(" - localvar length: %d", localvariable_table_length());
1903 if (localvariable_table_length() > 0) {
1904 LocalVariableTableElement* table = localvariable_table_start();
1905 st->print_cr(" - localvar start: " INTPTR_FORMAT, table);
1906 if (Verbose) {
1907 for (int i = 0; i < localvariable_table_length(); i++) {
1908 int bci = table[i].start_bci;
1909 int len = table[i].length;
1910 const char* name = constants()->printable_name_at(table[i].name_cp_index);
1911 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
1912 int slot = table[i].slot;
1913 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
1914 }
1915 }
1916 }
1917 if (code() != NULL) {
1918 st->print (" - compiled code: ");
1919 code()->print_value_on(st);
1920 }
1921 if (is_native()) {
1922 st->print_cr(" - native function: " INTPTR_FORMAT, native_function());
1923 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
1924 }
1925 }
1927 #endif //PRODUCT
1929 void Method::print_value_on(outputStream* st) const {
1930 assert(is_method(), "must be method");
1931 st->print_cr(internal_name());
1932 print_address_on(st);
1933 st->print(" ");
1934 name()->print_value_on(st);
1935 st->print(" ");
1936 signature()->print_value_on(st);
1937 st->print(" in ");
1938 method_holder()->print_value_on(st);
1939 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
1940 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
1941 }
1944 // Verification
1946 void Method::verify_on(outputStream* st) {
1947 guarantee(is_method(), "object must be method");
1948 guarantee(is_metadata(), "should be metadata");
1949 guarantee(constants()->is_constantPool(), "should be constant pool");
1950 guarantee(constants()->is_metadata(), "should be metadata");
1951 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
1952 guarantee(constMethod()->is_metadata(), "should be metadata");
1953 MethodData* md = method_data();
1954 guarantee(md == NULL ||
1955 md->is_metadata(), "should be metadata");
1956 guarantee(md == NULL ||
1957 md->is_methodData(), "should be method data");
1958 }