Mercurial > hg > truffle
annotate src/share/vm/oops/methodOop.cpp @ 1078:8e7adf982378
6896043: first round of zero fixes
Reviewed-by: kvn
Contributed-by: Gary Benson <gbenson@redhat.com>
author | twisti |
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date | Fri, 27 Nov 2009 07:56:58 -0800 |
parents | 987e948ebbc8 |
children | 4ce7240d622c |
rev | line source |
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0 | 1 /* |
579 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_methodOop.cpp.incl" | |
27 | |
28 | |
29 // Implementation of methodOopDesc | |
30 | |
31 address methodOopDesc::get_i2c_entry() { | |
32 assert(_adapter != NULL, "must have"); | |
33 return _adapter->get_i2c_entry(); | |
34 } | |
35 | |
36 address methodOopDesc::get_c2i_entry() { | |
37 assert(_adapter != NULL, "must have"); | |
38 return _adapter->get_c2i_entry(); | |
39 } | |
40 | |
41 address methodOopDesc::get_c2i_unverified_entry() { | |
42 assert(_adapter != NULL, "must have"); | |
43 return _adapter->get_c2i_unverified_entry(); | |
44 } | |
45 | |
46 char* methodOopDesc::name_and_sig_as_C_string() { | |
47 return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature()); | |
48 } | |
49 | |
50 char* methodOopDesc::name_and_sig_as_C_string(char* buf, int size) { | |
51 return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature(), buf, size); | |
52 } | |
53 | |
54 char* methodOopDesc::name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature) { | |
55 const char* klass_name = klass->external_name(); | |
56 int klass_name_len = (int)strlen(klass_name); | |
57 int method_name_len = method_name->utf8_length(); | |
58 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); | |
59 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); | |
60 strcpy(dest, klass_name); | |
61 dest[klass_name_len] = '.'; | |
62 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); | |
63 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); | |
64 dest[len] = 0; | |
65 return dest; | |
66 } | |
67 | |
68 char* methodOopDesc::name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature, char* buf, int size) { | |
69 symbolOop klass_name = klass->name(); | |
70 klass_name->as_klass_external_name(buf, size); | |
71 int len = (int)strlen(buf); | |
72 | |
73 if (len < size - 1) { | |
74 buf[len++] = '.'; | |
75 | |
76 method_name->as_C_string(&(buf[len]), size - len); | |
77 len = (int)strlen(buf); | |
78 | |
79 signature->as_C_string(&(buf[len]), size - len); | |
80 } | |
81 | |
82 return buf; | |
83 } | |
84 | |
85 int methodOopDesc::fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS) { | |
86 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) | |
87 const int beg_bci_offset = 0; | |
88 const int end_bci_offset = 1; | |
89 const int handler_bci_offset = 2; | |
90 const int klass_index_offset = 3; | |
91 const int entry_size = 4; | |
92 // access exception table | |
93 typeArrayHandle table (THREAD, constMethod()->exception_table()); | |
94 int length = table->length(); | |
95 assert(length % entry_size == 0, "exception table format has changed"); | |
96 // iterate through all entries sequentially | |
97 constantPoolHandle pool(THREAD, constants()); | |
98 for (int i = 0; i < length; i += entry_size) { | |
99 int beg_bci = table->int_at(i + beg_bci_offset); | |
100 int end_bci = table->int_at(i + end_bci_offset); | |
101 assert(beg_bci <= end_bci, "inconsistent exception table"); | |
102 if (beg_bci <= throw_bci && throw_bci < end_bci) { | |
103 // exception handler bci range covers throw_bci => investigate further | |
104 int handler_bci = table->int_at(i + handler_bci_offset); | |
105 int klass_index = table->int_at(i + klass_index_offset); | |
106 if (klass_index == 0) { | |
107 return handler_bci; | |
108 } else if (ex_klass.is_null()) { | |
109 return handler_bci; | |
110 } else { | |
111 // we know the exception class => get the constraint class | |
112 // this may require loading of the constraint class; if verification | |
113 // fails or some other exception occurs, return handler_bci | |
114 klassOop k = pool->klass_at(klass_index, CHECK_(handler_bci)); | |
115 KlassHandle klass = KlassHandle(THREAD, k); | |
116 assert(klass.not_null(), "klass not loaded"); | |
117 if (ex_klass->is_subtype_of(klass())) { | |
118 return handler_bci; | |
119 } | |
120 } | |
121 } | |
122 } | |
123 | |
124 return -1; | |
125 } | |
126 | |
127 methodOop methodOopDesc::method_from_bcp(address bcp) { | |
128 debug_only(static int count = 0; count++); | |
129 assert(Universe::heap()->is_in_permanent(bcp), "bcp not in perm_gen"); | |
130 // TO DO: this may be unsafe in some configurations | |
131 HeapWord* p = Universe::heap()->block_start(bcp); | |
132 assert(Universe::heap()->block_is_obj(p), "must be obj"); | |
133 assert(oop(p)->is_constMethod(), "not a method"); | |
134 return constMethodOop(p)->method(); | |
135 } | |
136 | |
137 | |
138 void methodOopDesc::mask_for(int bci, InterpreterOopMap* mask) { | |
139 | |
140 Thread* myThread = Thread::current(); | |
141 methodHandle h_this(myThread, this); | |
142 #ifdef ASSERT | |
143 bool has_capability = myThread->is_VM_thread() || | |
144 myThread->is_ConcurrentGC_thread() || | |
145 myThread->is_GC_task_thread(); | |
146 | |
147 if (!has_capability) { | |
148 if (!VerifyStack && !VerifyLastFrame) { | |
149 // verify stack calls this outside VM thread | |
150 warning("oopmap should only be accessed by the " | |
151 "VM, GC task or CMS threads (or during debugging)"); | |
152 InterpreterOopMap local_mask; | |
153 instanceKlass::cast(method_holder())->mask_for(h_this, bci, &local_mask); | |
154 local_mask.print(); | |
155 } | |
156 } | |
157 #endif | |
158 instanceKlass::cast(method_holder())->mask_for(h_this, bci, mask); | |
159 return; | |
160 } | |
161 | |
162 | |
163 int methodOopDesc::bci_from(address bcp) const { | |
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164 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), "bcp doesn't belong to this method"); |
0 | 165 return bcp - code_base(); |
166 } | |
167 | |
168 | |
169 // Return (int)bcx if it appears to be a valid BCI. | |
170 // Return bci_from((address)bcx) if it appears to be a valid BCP. | |
171 // Return -1 otherwise. | |
172 // Used by profiling code, when invalid data is a possibility. | |
173 // The caller is responsible for validating the methodOop itself. | |
174 int methodOopDesc::validate_bci_from_bcx(intptr_t bcx) const { | |
175 // keep bci as -1 if not a valid bci | |
176 int bci = -1; | |
177 if (bcx == 0 || (address)bcx == code_base()) { | |
178 // code_size() may return 0 and we allow 0 here | |
179 // the method may be native | |
180 bci = 0; | |
181 } else if (frame::is_bci(bcx)) { | |
182 if (bcx < code_size()) { | |
183 bci = (int)bcx; | |
184 } | |
185 } else if (contains((address)bcx)) { | |
186 bci = (address)bcx - code_base(); | |
187 } | |
188 // Assert that if we have dodged any asserts, bci is negative. | |
189 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); | |
190 return bci; | |
191 } | |
192 | |
193 address methodOopDesc::bcp_from(int bci) const { | |
194 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci"); | |
195 address bcp = code_base() + bci; | |
196 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); | |
197 return bcp; | |
198 } | |
199 | |
200 | |
201 int methodOopDesc::object_size(bool is_native) { | |
202 // If native, then include pointers for native_function and signature_handler | |
203 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; | |
204 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; | |
205 return align_object_size(header_size() + extra_words); | |
206 } | |
207 | |
208 | |
209 symbolOop methodOopDesc::klass_name() const { | |
210 klassOop k = method_holder(); | |
211 assert(k->is_klass(), "must be klass"); | |
212 instanceKlass* ik = (instanceKlass*) k->klass_part(); | |
213 return ik->name(); | |
214 } | |
215 | |
216 | |
217 void methodOopDesc::set_interpreter_kind() { | |
218 int kind = Interpreter::method_kind(methodOop(this)); | |
219 assert(kind != Interpreter::invalid, | |
220 "interpreter entry must be valid"); | |
221 set_interpreter_kind(kind); | |
222 } | |
223 | |
224 | |
225 // Attempt to return method oop to original state. Clear any pointers | |
226 // (to objects outside the shared spaces). We won't be able to predict | |
227 // where they should point in a new JVM. Further initialize some | |
228 // entries now in order allow them to be write protected later. | |
229 | |
230 void methodOopDesc::remove_unshareable_info() { | |
231 unlink_method(); | |
232 set_interpreter_kind(); | |
233 } | |
234 | |
235 | |
236 bool methodOopDesc::was_executed_more_than(int n) const { | |
237 // Invocation counter is reset when the methodOop is compiled. | |
238 // If the method has compiled code we therefore assume it has | |
239 // be excuted more than n times. | |
240 if (is_accessor() || is_empty_method() || (code() != NULL)) { | |
241 // interpreter doesn't bump invocation counter of trivial methods | |
242 // compiler does not bump invocation counter of compiled methods | |
243 return true; | |
244 } else if (_invocation_counter.carry()) { | |
245 // The carry bit is set when the counter overflows and causes | |
246 // a compilation to occur. We don't know how many times | |
247 // the counter has been reset, so we simply assume it has | |
248 // been executed more than n times. | |
249 return true; | |
250 } else { | |
251 return invocation_count() > n; | |
252 } | |
253 } | |
254 | |
255 #ifndef PRODUCT | |
256 void methodOopDesc::print_invocation_count() const { | |
257 if (is_static()) tty->print("static "); | |
258 if (is_final()) tty->print("final "); | |
259 if (is_synchronized()) tty->print("synchronized "); | |
260 if (is_native()) tty->print("native "); | |
261 method_holder()->klass_part()->name()->print_symbol_on(tty); | |
262 tty->print("."); | |
263 name()->print_symbol_on(tty); | |
264 signature()->print_symbol_on(tty); | |
265 | |
266 if (WizardMode) { | |
267 // dump the size of the byte codes | |
268 tty->print(" {%d}", code_size()); | |
269 } | |
270 tty->cr(); | |
271 | |
272 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); | |
273 tty->print_cr (" invocation_counter: %8d ", invocation_count()); | |
274 tty->print_cr (" backedge_counter: %8d ", backedge_count()); | |
275 if (CountCompiledCalls) { | |
276 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); | |
277 } | |
278 | |
279 } | |
280 #endif | |
281 | |
282 // Build a methodDataOop object to hold information about this method | |
283 // collected in the interpreter. | |
284 void methodOopDesc::build_interpreter_method_data(methodHandle method, TRAPS) { | |
285 // Grab a lock here to prevent multiple | |
286 // methodDataOops from being created. | |
287 MutexLocker ml(MethodData_lock, THREAD); | |
288 if (method->method_data() == NULL) { | |
289 methodDataOop method_data = oopFactory::new_methodData(method, CHECK); | |
290 method->set_method_data(method_data); | |
291 if (PrintMethodData && (Verbose || WizardMode)) { | |
292 ResourceMark rm(THREAD); | |
293 tty->print("build_interpreter_method_data for "); | |
294 method->print_name(tty); | |
295 tty->cr(); | |
296 // At the end of the run, the MDO, full of data, will be dumped. | |
297 } | |
298 } | |
299 } | |
300 | |
301 void methodOopDesc::cleanup_inline_caches() { | |
302 // The current system doesn't use inline caches in the interpreter | |
303 // => nothing to do (keep this method around for future use) | |
304 } | |
305 | |
306 | |
710 | 307 int methodOopDesc::extra_stack_words() { |
308 // not an inline function, to avoid a header dependency on Interpreter | |
309 return extra_stack_entries() * Interpreter::stackElementSize(); | |
310 } | |
311 | |
312 | |
0 | 313 void methodOopDesc::compute_size_of_parameters(Thread *thread) { |
314 symbolHandle h_signature(thread, signature()); | |
315 ArgumentSizeComputer asc(h_signature); | |
316 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); | |
317 } | |
318 | |
319 #ifdef CC_INTERP | |
320 void methodOopDesc::set_result_index(BasicType type) { | |
321 _result_index = Interpreter::BasicType_as_index(type); | |
322 } | |
323 #endif | |
324 | |
325 BasicType methodOopDesc::result_type() const { | |
326 ResultTypeFinder rtf(signature()); | |
327 return rtf.type(); | |
328 } | |
329 | |
330 | |
331 bool methodOopDesc::is_empty_method() const { | |
332 return code_size() == 1 | |
333 && *code_base() == Bytecodes::_return; | |
334 } | |
335 | |
336 | |
337 bool methodOopDesc::is_vanilla_constructor() const { | |
338 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method | |
339 // which only calls the superclass vanilla constructor and possibly does stores of | |
340 // zero constants to local fields: | |
341 // | |
342 // aload_0 | |
343 // invokespecial | |
344 // indexbyte1 | |
345 // indexbyte2 | |
346 // | |
347 // followed by an (optional) sequence of: | |
348 // | |
349 // aload_0 | |
350 // aconst_null / iconst_0 / fconst_0 / dconst_0 | |
351 // putfield | |
352 // indexbyte1 | |
353 // indexbyte2 | |
354 // | |
355 // followed by: | |
356 // | |
357 // return | |
358 | |
359 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); | |
360 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); | |
361 int size = code_size(); | |
362 // Check if size match | |
363 if (size == 0 || size % 5 != 0) return false; | |
364 address cb = code_base(); | |
365 int last = size - 1; | |
366 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { | |
367 // Does not call superclass default constructor | |
368 return false; | |
369 } | |
370 // Check optional sequence | |
371 for (int i = 4; i < last; i += 5) { | |
372 if (cb[i] != Bytecodes::_aload_0) return false; | |
373 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; | |
374 if (cb[i+2] != Bytecodes::_putfield) return false; | |
375 } | |
376 return true; | |
377 } | |
378 | |
379 | |
380 bool methodOopDesc::compute_has_loops_flag() { | |
381 BytecodeStream bcs(methodOop(this)); | |
382 Bytecodes::Code bc; | |
383 | |
384 while ((bc = bcs.next()) >= 0) { | |
385 switch( bc ) { | |
386 case Bytecodes::_ifeq: | |
387 case Bytecodes::_ifnull: | |
388 case Bytecodes::_iflt: | |
389 case Bytecodes::_ifle: | |
390 case Bytecodes::_ifne: | |
391 case Bytecodes::_ifnonnull: | |
392 case Bytecodes::_ifgt: | |
393 case Bytecodes::_ifge: | |
394 case Bytecodes::_if_icmpeq: | |
395 case Bytecodes::_if_icmpne: | |
396 case Bytecodes::_if_icmplt: | |
397 case Bytecodes::_if_icmpgt: | |
398 case Bytecodes::_if_icmple: | |
399 case Bytecodes::_if_icmpge: | |
400 case Bytecodes::_if_acmpeq: | |
401 case Bytecodes::_if_acmpne: | |
402 case Bytecodes::_goto: | |
403 case Bytecodes::_jsr: | |
404 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); | |
405 break; | |
406 | |
407 case Bytecodes::_goto_w: | |
408 case Bytecodes::_jsr_w: | |
409 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); | |
410 break; | |
411 } | |
412 } | |
413 _access_flags.set_loops_flag_init(); | |
414 return _access_flags.has_loops(); | |
415 } | |
416 | |
417 | |
418 bool methodOopDesc::is_final_method() const { | |
419 // %%% Should return true for private methods also, | |
420 // since there is no way to override them. | |
421 return is_final() || Klass::cast(method_holder())->is_final(); | |
422 } | |
423 | |
424 | |
425 bool methodOopDesc::is_strict_method() const { | |
426 return is_strict(); | |
427 } | |
428 | |
429 | |
430 bool methodOopDesc::can_be_statically_bound() const { | |
431 if (is_final_method()) return true; | |
432 return vtable_index() == nonvirtual_vtable_index; | |
433 } | |
434 | |
435 | |
436 bool methodOopDesc::is_accessor() const { | |
437 if (code_size() != 5) return false; | |
438 if (size_of_parameters() != 1) return false; | |
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439 methodOop m = (methodOop)this; // pass to code_at() to avoid method_from_bcp |
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440 if (Bytecodes::java_code_at(code_base()+0, m) != Bytecodes::_aload_0 ) return false; |
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441 if (Bytecodes::java_code_at(code_base()+1, m) != Bytecodes::_getfield) return false; |
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442 if (Bytecodes::java_code_at(code_base()+4, m) != Bytecodes::_areturn && |
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443 Bytecodes::java_code_at(code_base()+4, m) != Bytecodes::_ireturn ) return false; |
0 | 444 return true; |
445 } | |
446 | |
447 | |
448 bool methodOopDesc::is_initializer() const { | |
449 return name() == vmSymbols::object_initializer_name() || name() == vmSymbols::class_initializer_name(); | |
450 } | |
451 | |
452 | |
453 objArrayHandle methodOopDesc::resolved_checked_exceptions_impl(methodOop this_oop, TRAPS) { | |
454 int length = this_oop->checked_exceptions_length(); | |
455 if (length == 0) { // common case | |
456 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); | |
457 } else { | |
458 methodHandle h_this(THREAD, this_oop); | |
459 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::class_klass(), length, CHECK_(objArrayHandle())); | |
460 objArrayHandle mirrors (THREAD, m_oop); | |
461 for (int i = 0; i < length; i++) { | |
462 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe | |
463 klassOop k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); | |
464 assert(Klass::cast(k)->is_subclass_of(SystemDictionary::throwable_klass()), "invalid exception class"); | |
465 mirrors->obj_at_put(i, Klass::cast(k)->java_mirror()); | |
466 } | |
467 return mirrors; | |
468 } | |
469 }; | |
470 | |
471 | |
472 int methodOopDesc::line_number_from_bci(int bci) const { | |
473 if (bci == SynchronizationEntryBCI) bci = 0; | |
474 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); | |
475 int best_bci = 0; | |
476 int best_line = -1; | |
477 | |
478 if (has_linenumber_table()) { | |
479 // The line numbers are a short array of 2-tuples [start_pc, line_number]. | |
480 // Not necessarily sorted and not necessarily one-to-one. | |
481 CompressedLineNumberReadStream stream(compressed_linenumber_table()); | |
482 while (stream.read_pair()) { | |
483 if (stream.bci() == bci) { | |
484 // perfect match | |
485 return stream.line(); | |
486 } else { | |
487 // update best_bci/line | |
488 if (stream.bci() < bci && stream.bci() >= best_bci) { | |
489 best_bci = stream.bci(); | |
490 best_line = stream.line(); | |
491 } | |
492 } | |
493 } | |
494 } | |
495 return best_line; | |
496 } | |
497 | |
498 | |
499 bool methodOopDesc::is_klass_loaded_by_klass_index(int klass_index) const { | |
500 if( _constants->tag_at(klass_index).is_unresolved_klass() ) { | |
501 Thread *thread = Thread::current(); | |
502 symbolHandle klass_name(thread, _constants->klass_name_at(klass_index)); | |
503 Handle loader(thread, instanceKlass::cast(method_holder())->class_loader()); | |
504 Handle prot (thread, Klass::cast(method_holder())->protection_domain()); | |
505 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; | |
506 } else { | |
507 return true; | |
508 } | |
509 } | |
510 | |
511 | |
512 bool methodOopDesc::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { | |
513 int klass_index = _constants->klass_ref_index_at(refinfo_index); | |
514 if (must_be_resolved) { | |
515 // Make sure klass is resolved in constantpool. | |
516 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; | |
517 } | |
518 return is_klass_loaded_by_klass_index(klass_index); | |
519 } | |
520 | |
521 | |
522 void methodOopDesc::set_native_function(address function, bool post_event_flag) { | |
523 assert(function != NULL, "use clear_native_function to unregister natives"); | |
524 address* native_function = native_function_addr(); | |
525 | |
526 // We can see racers trying to place the same native function into place. Once | |
527 // is plenty. | |
528 address current = *native_function; | |
529 if (current == function) return; | |
530 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && | |
531 function != NULL) { | |
532 // native_method_throw_unsatisfied_link_error_entry() should only | |
533 // be passed when post_event_flag is false. | |
534 assert(function != | |
535 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
536 "post_event_flag mis-match"); | |
537 | |
538 // post the bind event, and possible change the bind function | |
539 JvmtiExport::post_native_method_bind(this, &function); | |
540 } | |
541 *native_function = function; | |
542 // This function can be called more than once. We must make sure that we always | |
543 // use the latest registered method -> check if a stub already has been generated. | |
544 // If so, we have to make it not_entrant. | |
545 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates | |
546 if (nm != NULL) { | |
547 nm->make_not_entrant(); | |
548 } | |
549 } | |
550 | |
551 | |
552 bool methodOopDesc::has_native_function() const { | |
553 address func = native_function(); | |
554 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); | |
555 } | |
556 | |
557 | |
558 void methodOopDesc::clear_native_function() { | |
559 set_native_function( | |
560 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
561 !native_bind_event_is_interesting); | |
562 clear_code(); | |
563 } | |
564 | |
565 | |
566 void methodOopDesc::set_signature_handler(address handler) { | |
567 address* signature_handler = signature_handler_addr(); | |
568 *signature_handler = handler; | |
569 } | |
570 | |
571 | |
572 bool methodOopDesc::is_not_compilable(int comp_level) const { | |
710 | 573 if (is_method_handle_invoke()) { |
574 // compilers must recognize this method specially, or not at all | |
575 return true; | |
576 } | |
577 | |
0 | 578 methodDataOop mdo = method_data(); |
579 if (mdo != NULL | |
580 && (uint)mdo->decompile_count() > (uint)PerMethodRecompilationCutoff) { | |
581 // Since (uint)-1 is large, -1 really means 'no cutoff'. | |
582 return true; | |
583 } | |
584 #ifdef COMPILER2 | |
585 if (is_tier1_compile(comp_level)) { | |
586 if (is_not_tier1_compilable()) { | |
587 return true; | |
588 } | |
589 } | |
590 #endif // COMPILER2 | |
591 return (_invocation_counter.state() == InvocationCounter::wait_for_nothing) | |
592 || (number_of_breakpoints() > 0); | |
593 } | |
594 | |
595 // call this when compiler finds that this method is not compilable | |
596 void methodOopDesc::set_not_compilable(int comp_level) { | |
597 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { | |
598 ttyLocker ttyl; | |
599 xtty->begin_elem("make_not_compilable thread='%d'", (int) os::current_thread_id()); | |
600 xtty->method(methodOop(this)); | |
601 xtty->stamp(); | |
602 xtty->end_elem(); | |
603 } | |
604 #ifdef COMPILER2 | |
605 if (is_tier1_compile(comp_level)) { | |
606 set_not_tier1_compilable(); | |
607 return; | |
608 } | |
609 #endif /* COMPILER2 */ | |
610 assert(comp_level == CompLevel_highest_tier, "unexpected compilation level"); | |
611 invocation_counter()->set_state(InvocationCounter::wait_for_nothing); | |
612 backedge_counter()->set_state(InvocationCounter::wait_for_nothing); | |
613 } | |
614 | |
615 // Revert to using the interpreter and clear out the nmethod | |
616 void methodOopDesc::clear_code() { | |
617 | |
618 // this may be NULL if c2i adapters have not been made yet | |
619 // Only should happen at allocate time. | |
620 if (_adapter == NULL) { | |
621 _from_compiled_entry = NULL; | |
622 } else { | |
623 _from_compiled_entry = _adapter->get_c2i_entry(); | |
624 } | |
625 OrderAccess::storestore(); | |
626 _from_interpreted_entry = _i2i_entry; | |
627 OrderAccess::storestore(); | |
628 _code = NULL; | |
629 } | |
630 | |
631 // Called by class data sharing to remove any entry points (which are not shared) | |
632 void methodOopDesc::unlink_method() { | |
633 _code = NULL; | |
634 _i2i_entry = NULL; | |
635 _from_interpreted_entry = NULL; | |
636 if (is_native()) { | |
637 *native_function_addr() = NULL; | |
638 set_signature_handler(NULL); | |
639 } | |
640 NOT_PRODUCT(set_compiled_invocation_count(0);) | |
641 invocation_counter()->reset(); | |
642 backedge_counter()->reset(); | |
643 _adapter = NULL; | |
644 _from_compiled_entry = NULL; | |
645 assert(_method_data == NULL, "unexpected method data?"); | |
646 set_method_data(NULL); | |
647 set_interpreter_throwout_count(0); | |
648 set_interpreter_invocation_count(0); | |
649 _highest_tier_compile = CompLevel_none; | |
650 } | |
651 | |
652 // Called when the method_holder is getting linked. Setup entrypoints so the method | |
653 // is ready to be called from interpreter, compiler, and vtables. | |
654 void methodOopDesc::link_method(methodHandle h_method, TRAPS) { | |
655 assert(_i2i_entry == NULL, "should only be called once"); | |
656 assert(_adapter == NULL, "init'd to NULL" ); | |
657 assert( _code == NULL, "nothing compiled yet" ); | |
658 | |
659 // Setup interpreter entrypoint | |
660 assert(this == h_method(), "wrong h_method()" ); | |
661 address entry = Interpreter::entry_for_method(h_method); | |
662 assert(entry != NULL, "interpreter entry must be non-null"); | |
663 // Sets both _i2i_entry and _from_interpreted_entry | |
664 set_interpreter_entry(entry); | |
710 | 665 if (is_native() && !is_method_handle_invoke()) { |
0 | 666 set_native_function( |
667 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
668 !native_bind_event_is_interesting); | |
669 } | |
670 | |
671 // Setup compiler entrypoint. This is made eagerly, so we do not need | |
672 // special handling of vtables. An alternative is to make adapters more | |
673 // lazily by calling make_adapter() from from_compiled_entry() for the | |
674 // normal calls. For vtable calls life gets more complicated. When a | |
675 // call-site goes mega-morphic we need adapters in all methods which can be | |
676 // called from the vtable. We need adapters on such methods that get loaded | |
677 // later. Ditto for mega-morphic itable calls. If this proves to be a | |
678 // problem we'll make these lazily later. | |
679 (void) make_adapters(h_method, CHECK); | |
680 | |
681 // ONLY USE the h_method now as make_adapter may have blocked | |
682 | |
683 } | |
684 | |
685 address methodOopDesc::make_adapters(methodHandle mh, TRAPS) { | |
686 // Adapters for compiled code are made eagerly here. They are fairly | |
687 // small (generally < 100 bytes) and quick to make (and cached and shared) | |
688 // so making them eagerly shouldn't be too expensive. | |
689 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); | |
690 if (adapter == NULL ) { | |
691 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); | |
692 } | |
693 | |
694 mh->set_adapter_entry(adapter); | |
695 mh->_from_compiled_entry = adapter->get_c2i_entry(); | |
696 return adapter->get_c2i_entry(); | |
697 } | |
698 | |
699 // The verified_code_entry() must be called when a invoke is resolved | |
700 // on this method. | |
701 | |
702 // It returns the compiled code entry point, after asserting not null. | |
703 // This function is called after potential safepoints so that nmethod | |
704 // or adapter that it points to is still live and valid. | |
705 // This function must not hit a safepoint! | |
706 address methodOopDesc::verified_code_entry() { | |
707 debug_only(No_Safepoint_Verifier nsv;) | |
708 assert(_from_compiled_entry != NULL, "must be set"); | |
709 return _from_compiled_entry; | |
710 } | |
711 | |
712 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all | |
713 // (could be racing a deopt). | |
714 // Not inline to avoid circular ref. | |
715 bool methodOopDesc::check_code() const { | |
716 // cached in a register or local. There's a race on the value of the field. | |
717 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); | |
718 return code == NULL || (code->method() == NULL) || (code->method() == (methodOop)this && !code->is_osr_method()); | |
719 } | |
720 | |
721 // Install compiled code. Instantly it can execute. | |
722 void methodOopDesc::set_code(methodHandle mh, nmethod *code) { | |
723 assert( code, "use clear_code to remove code" ); | |
724 assert( mh->check_code(), "" ); | |
725 | |
726 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); | |
727 | |
728 // These writes must happen in this order, because the interpreter will | |
729 // directly jump to from_interpreted_entry which jumps to an i2c adapter | |
730 // which jumps to _from_compiled_entry. | |
731 mh->_code = code; // Assign before allowing compiled code to exec | |
732 | |
733 int comp_level = code->comp_level(); | |
734 // In theory there could be a race here. In practice it is unlikely | |
735 // and not worth worrying about. | |
736 if (comp_level > highest_tier_compile()) { | |
737 set_highest_tier_compile(comp_level); | |
738 } | |
739 | |
740 OrderAccess::storestore(); | |
741 mh->_from_compiled_entry = code->verified_entry_point(); | |
742 OrderAccess::storestore(); | |
743 // Instantly compiled code can execute. | |
744 mh->_from_interpreted_entry = mh->get_i2c_entry(); | |
745 | |
746 } | |
747 | |
748 | |
749 bool methodOopDesc::is_overridden_in(klassOop k) const { | |
750 instanceKlass* ik = instanceKlass::cast(k); | |
751 | |
752 if (ik->is_interface()) return false; | |
753 | |
754 // If method is an interface, we skip it - except if it | |
755 // is a miranda method | |
756 if (instanceKlass::cast(method_holder())->is_interface()) { | |
757 // Check that method is not a miranda method | |
758 if (ik->lookup_method(name(), signature()) == NULL) { | |
759 // No implementation exist - so miranda method | |
760 return false; | |
761 } | |
762 return true; | |
763 } | |
764 | |
765 assert(ik->is_subclass_of(method_holder()), "should be subklass"); | |
766 assert(ik->vtable() != NULL, "vtable should exist"); | |
767 if (vtable_index() == nonvirtual_vtable_index) { | |
768 return false; | |
769 } else { | |
770 methodOop vt_m = ik->method_at_vtable(vtable_index()); | |
771 return vt_m != methodOop(this); | |
772 } | |
773 } | |
774 | |
775 | |
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776 // give advice about whether this methodOop should be cached or not |
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777 bool methodOopDesc::should_not_be_cached() const { |
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778 if (is_old()) { |
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779 // This method has been redefined. It is either EMCP or obsolete |
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780 // and we don't want to cache it because that would pin the method |
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781 // down and prevent it from being collectible if and when it |
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782 // finishes executing. |
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783 return true; |
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784 } |
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785 |
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786 if (mark()->should_not_be_cached()) { |
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787 // It is either not safe or not a good idea to cache this |
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788 // method at this time because of the state of the embedded |
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789 // markOop. See markOop.cpp for the gory details. |
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790 return true; |
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791 } |
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792 |
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793 // caching this method should be just fine |
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794 return false; |
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795 } |
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796 |
710 | 797 // Constant pool structure for invoke methods: |
798 enum { | |
799 _imcp_invoke_name = 1, // utf8: 'invoke' | |
800 _imcp_invoke_signature, // utf8: (variable symbolOop) | |
801 _imcp_method_type_value, // string: (variable java/dyn/MethodType, sic) | |
802 _imcp_limit | |
803 }; | |
804 | |
805 oop methodOopDesc::method_handle_type() const { | |
806 if (!is_method_handle_invoke()) { assert(false, "caller resp."); return NULL; } | |
807 oop mt = constants()->resolved_string_at(_imcp_method_type_value); | |
808 assert(mt->klass() == SystemDictionary::MethodType_klass(), ""); | |
809 return mt; | |
810 } | |
811 | |
812 jint* methodOopDesc::method_type_offsets_chain() { | |
813 static jint pchase[] = { -1, -1, -1 }; | |
814 if (pchase[0] == -1) { | |
815 jint step0 = in_bytes(constants_offset()); | |
816 jint step1 = (constantPoolOopDesc::header_size() + _imcp_method_type_value) * HeapWordSize; | |
817 // do this in reverse to avoid races: | |
818 OrderAccess::release_store(&pchase[1], step1); | |
819 OrderAccess::release_store(&pchase[0], step0); | |
820 } | |
821 return pchase; | |
822 } | |
823 | |
824 methodHandle methodOopDesc::make_invoke_method(KlassHandle holder, | |
825 symbolHandle signature, | |
826 Handle method_type, TRAPS) { | |
827 methodHandle empty; | |
828 | |
829 assert(holder() == SystemDictionary::MethodHandle_klass(), | |
830 "must be a JSR 292 magic type"); | |
831 | |
832 if (TraceMethodHandles) { | |
833 tty->print("Creating invoke method for "); | |
834 signature->print_value(); | |
835 tty->cr(); | |
836 } | |
837 | |
838 constantPoolHandle cp; | |
839 { | |
840 constantPoolOop cp_oop = oopFactory::new_constantPool(_imcp_limit, IsSafeConc, CHECK_(empty)); | |
841 cp = constantPoolHandle(THREAD, cp_oop); | |
842 } | |
843 cp->symbol_at_put(_imcp_invoke_name, vmSymbols::invoke_name()); | |
844 cp->symbol_at_put(_imcp_invoke_signature, signature()); | |
845 cp->string_at_put(_imcp_method_type_value, vmSymbols::void_signature()); | |
846 cp->set_pool_holder(holder()); | |
847 | |
848 // set up the fancy stuff: | |
849 cp->pseudo_string_at_put(_imcp_method_type_value, method_type()); | |
850 methodHandle m; | |
851 { | |
852 int flags_bits = (JVM_MH_INVOKE_BITS | JVM_ACC_PUBLIC | JVM_ACC_FINAL); | |
853 methodOop m_oop = oopFactory::new_method(0, accessFlags_from(flags_bits), | |
854 0, 0, 0, IsSafeConc, CHECK_(empty)); | |
855 m = methodHandle(THREAD, m_oop); | |
856 } | |
857 m->set_constants(cp()); | |
858 m->set_name_index(_imcp_invoke_name); | |
859 m->set_signature_index(_imcp_invoke_signature); | |
860 assert(m->name() == vmSymbols::invoke_name(), ""); | |
861 assert(m->signature() == signature(), ""); | |
862 #ifdef CC_INTERP | |
863 ResultTypeFinder rtf(signature()); | |
864 m->set_result_index(rtf.type()); | |
865 #endif | |
866 m->compute_size_of_parameters(THREAD); | |
867 m->set_exception_table(Universe::the_empty_int_array()); | |
868 | |
869 // Finally, set up its entry points. | |
870 assert(m->method_handle_type() == method_type(), ""); | |
871 assert(m->can_be_statically_bound(), ""); | |
872 m->set_vtable_index(methodOopDesc::nonvirtual_vtable_index); | |
873 m->link_method(m, CHECK_(empty)); | |
874 | |
875 #ifdef ASSERT | |
876 // Make sure the pointer chase works. | |
877 address p = (address) m(); | |
878 for (jint* pchase = method_type_offsets_chain(); (*pchase) != -1; pchase++) { | |
879 p = *(address*)(p + (*pchase)); | |
880 } | |
881 assert((oop)p == method_type(), "pointer chase is correct"); | |
882 #endif | |
883 | |
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884 if (TraceMethodHandles && (Verbose || WizardMode)) |
710 | 885 m->print_on(tty); |
886 | |
887 return m; | |
888 } | |
889 | |
890 | |
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891 |
0 | 892 methodHandle methodOopDesc:: clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, |
893 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { | |
894 // Code below does not work for native methods - they should never get rewritten anyway | |
895 assert(!m->is_native(), "cannot rewrite native methods"); | |
896 // Allocate new methodOop | |
897 AccessFlags flags = m->access_flags(); | |
898 int checked_exceptions_len = m->checked_exceptions_length(); | |
899 int localvariable_len = m->localvariable_table_length(); | |
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900 // Allocate newm_oop with the is_conc_safe parameter set |
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901 // to IsUnsafeConc to indicate that newm_oop is not yet |
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902 // safe for concurrent processing by a GC. |
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903 methodOop newm_oop = oopFactory::new_method(new_code_length, |
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904 flags, |
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905 new_compressed_linenumber_size, |
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906 localvariable_len, |
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907 checked_exceptions_len, |
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908 IsUnsafeConc, |
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909 CHECK_(methodHandle())); |
0 | 910 methodHandle newm (THREAD, newm_oop); |
911 int new_method_size = newm->method_size(); | |
912 // Create a shallow copy of methodOopDesc part, but be careful to preserve the new constMethodOop | |
913 constMethodOop newcm = newm->constMethod(); | |
914 int new_const_method_size = newm->constMethod()->object_size(); | |
518
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915 |
0 | 916 memcpy(newm(), m(), sizeof(methodOopDesc)); |
917 // Create shallow copy of constMethodOopDesc, but be careful to preserve the methodOop | |
518
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918 // is_conc_safe is set to false because that is the value of |
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919 // is_conc_safe initialzied into newcm and the copy should |
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920 // not overwrite that value. During the window during which it is |
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921 // tagged as unsafe, some extra work could be needed during precleaning |
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922 // or concurrent marking but those phases will be correct. Setting and |
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923 // resetting is done in preference to a careful copying into newcm to |
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924 // avoid having to know the precise layout of a constMethodOop. |
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925 m->constMethod()->set_is_conc_safe(false); |
0 | 926 memcpy(newcm, m->constMethod(), sizeof(constMethodOopDesc)); |
518
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927 m->constMethod()->set_is_conc_safe(true); |
0 | 928 // Reset correct method/const method, method size, and parameter info |
929 newcm->set_method(newm()); | |
930 newm->set_constMethod(newcm); | |
931 assert(newcm->method() == newm(), "check"); | |
932 newm->constMethod()->set_code_size(new_code_length); | |
933 newm->constMethod()->set_constMethod_size(new_const_method_size); | |
934 newm->set_method_size(new_method_size); | |
935 assert(newm->code_size() == new_code_length, "check"); | |
936 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); | |
937 assert(newm->localvariable_table_length() == localvariable_len, "check"); | |
938 // Copy new byte codes | |
939 memcpy(newm->code_base(), new_code, new_code_length); | |
940 // Copy line number table | |
941 if (new_compressed_linenumber_size > 0) { | |
942 memcpy(newm->compressed_linenumber_table(), | |
943 new_compressed_linenumber_table, | |
944 new_compressed_linenumber_size); | |
945 } | |
946 // Copy checked_exceptions | |
947 if (checked_exceptions_len > 0) { | |
948 memcpy(newm->checked_exceptions_start(), | |
949 m->checked_exceptions_start(), | |
950 checked_exceptions_len * sizeof(CheckedExceptionElement)); | |
951 } | |
952 // Copy local variable number table | |
953 if (localvariable_len > 0) { | |
954 memcpy(newm->localvariable_table_start(), | |
955 m->localvariable_table_start(), | |
956 localvariable_len * sizeof(LocalVariableTableElement)); | |
957 } | |
518
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958 |
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959 // Only set is_conc_safe to true when changes to newcm are |
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960 // complete. |
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961 newcm->set_is_conc_safe(true); |
0 | 962 return newm; |
963 } | |
964 | |
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965 vmSymbols::SID methodOopDesc::klass_id_for_intrinsics(klassOop holder) { |
0 | 966 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics |
967 // because we are not loading from core libraries | |
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968 if (instanceKlass::cast(holder)->class_loader() != NULL) |
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969 return vmSymbols::NO_SID; // regardless of name, no intrinsics here |
0 | 970 |
971 // see if the klass name is well-known: | |
856
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972 symbolOop klass_name = instanceKlass::cast(holder)->name(); |
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973 return vmSymbols::find_sid(klass_name); |
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974 } |
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975 |
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976 void methodOopDesc::init_intrinsic_id() { |
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977 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); |
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978 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); |
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979 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); |
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980 |
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981 // the klass name is well-known: |
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982 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); |
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983 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); |
0 | 984 |
985 // ditto for method and signature: | |
986 vmSymbols::SID name_id = vmSymbols::find_sid(name()); | |
856
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987 if (name_id == vmSymbols::NO_SID) return; |
0 | 988 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); |
856
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989 if (sig_id == vmSymbols::NO_SID) return; |
0 | 990 jshort flags = access_flags().as_short(); |
991 | |
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992 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); |
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993 if (id != vmIntrinsics::_none) { |
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994 set_intrinsic_id(id); |
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995 return; |
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996 } |
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997 |
0 | 998 // A few slightly irregular cases: |
999 switch (klass_id) { | |
1000 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): | |
1001 // Second chance: check in regular Math. | |
1002 switch (name_id) { | |
1003 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): | |
1004 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): | |
1005 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): | |
1006 // pretend it is the corresponding method in the non-strict class: | |
1007 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); | |
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1008 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); |
0 | 1009 break; |
1010 } | |
1011 } | |
1012 | |
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1013 if (id != vmIntrinsics::_none) { |
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1014 // Set up its iid. It is an alias method. |
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1015 set_intrinsic_id(id); |
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1016 return; |
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1017 } |
0 | 1018 } |
1019 | |
1020 // These two methods are static since a GC may move the methodOopDesc | |
1021 bool methodOopDesc::load_signature_classes(methodHandle m, TRAPS) { | |
1022 bool sig_is_loaded = true; | |
1023 Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader()); | |
1024 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain()); | |
1025 symbolHandle signature(THREAD, m->signature()); | |
1026 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { | |
1027 if (ss.is_object()) { | |
1028 symbolOop sym = ss.as_symbol(CHECK_(false)); | |
1029 symbolHandle name (THREAD, sym); | |
1030 klassOop klass = SystemDictionary::resolve_or_null(name, class_loader, | |
1031 protection_domain, THREAD); | |
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1032 // We are loading classes eagerly. If a ClassNotFoundException or |
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1033 // a LinkageError was generated, be sure to ignore it. |
0 | 1034 if (HAS_PENDING_EXCEPTION) { |
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1035 if (PENDING_EXCEPTION->is_a(SystemDictionary::classNotFoundException_klass()) || |
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1036 PENDING_EXCEPTION->is_a(SystemDictionary::linkageError_klass())) { |
0 | 1037 CLEAR_PENDING_EXCEPTION; |
1038 } else { | |
1039 return false; | |
1040 } | |
1041 } | |
1042 if( klass == NULL) { sig_is_loaded = false; } | |
1043 } | |
1044 } | |
1045 return sig_is_loaded; | |
1046 } | |
1047 | |
1048 bool methodOopDesc::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { | |
1049 Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader()); | |
1050 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain()); | |
1051 symbolHandle signature(THREAD, m->signature()); | |
1052 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { | |
1053 if (ss.type() == T_OBJECT) { | |
1054 symbolHandle name(THREAD, ss.as_symbol_or_null()); | |
1055 if (name() == NULL) return true; | |
1056 klassOop klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); | |
1057 if (klass == NULL) return true; | |
1058 } | |
1059 } | |
1060 return false; | |
1061 } | |
1062 | |
1063 // Exposed so field engineers can debug VM | |
1064 void methodOopDesc::print_short_name(outputStream* st) { | |
1065 ResourceMark rm; | |
1066 #ifdef PRODUCT | |
1067 st->print(" %s::", method_holder()->klass_part()->external_name()); | |
1068 #else | |
1069 st->print(" %s::", method_holder()->klass_part()->internal_name()); | |
1070 #endif | |
1071 name()->print_symbol_on(st); | |
1072 if (WizardMode) signature()->print_symbol_on(st); | |
1073 } | |
1074 | |
1075 | |
1076 extern "C" { | |
1077 static int method_compare(methodOop* a, methodOop* b) { | |
1078 return (*a)->name()->fast_compare((*b)->name()); | |
1079 } | |
1080 | |
1081 // Prevent qsort from reordering a previous valid sort by | |
1082 // considering the address of the methodOops if two methods | |
1083 // would otherwise compare as equal. Required to preserve | |
1084 // optimal access order in the shared archive. Slower than | |
1085 // method_compare, only used for shared archive creation. | |
1086 static int method_compare_idempotent(methodOop* a, methodOop* b) { | |
1087 int i = method_compare(a, b); | |
1088 if (i != 0) return i; | |
1089 return ( a < b ? -1 : (a == b ? 0 : 1)); | |
1090 } | |
1091 | |
1092 typedef int (*compareFn)(const void*, const void*); | |
1093 } | |
1094 | |
1095 | |
1096 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array | |
1097 static void reorder_based_on_method_index(objArrayOop methods, | |
1098 objArrayOop annotations, | |
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1099 GrowableArray<oop>* temp_array) { |
0 | 1100 if (annotations == NULL) { |
1101 return; | |
1102 } | |
1103 | |
1104 int length = methods->length(); | |
1105 int i; | |
1106 // Copy to temp array | |
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1107 temp_array->clear(); |
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1108 for (i = 0; i < length; i++) { |
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1109 temp_array->append(annotations->obj_at(i)); |
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1110 } |
0 | 1111 |
1112 // Copy back using old method indices | |
1113 for (i = 0; i < length; i++) { | |
1114 methodOop m = (methodOop) methods->obj_at(i); | |
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1115 annotations->obj_at_put(i, temp_array->at(m->method_idnum())); |
0 | 1116 } |
1117 } | |
1118 | |
1119 | |
1120 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array | |
1121 void methodOopDesc::sort_methods(objArrayOop methods, | |
1122 objArrayOop methods_annotations, | |
1123 objArrayOop methods_parameter_annotations, | |
1124 objArrayOop methods_default_annotations, | |
1125 bool idempotent) { | |
1126 int length = methods->length(); | |
1127 if (length > 1) { | |
1128 bool do_annotations = false; | |
1129 if (methods_annotations != NULL || | |
1130 methods_parameter_annotations != NULL || | |
1131 methods_default_annotations != NULL) { | |
1132 do_annotations = true; | |
1133 } | |
1134 if (do_annotations) { | |
1135 // Remember current method ordering so we can reorder annotations | |
1136 for (int i = 0; i < length; i++) { | |
1137 methodOop m = (methodOop) methods->obj_at(i); | |
1138 m->set_method_idnum(i); | |
1139 } | |
1140 } | |
1141 | |
1142 // Use a simple bubble sort for small number of methods since | |
1143 // qsort requires a functional pointer call for each comparison. | |
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1144 if (UseCompressedOops || length < 8) { |
0 | 1145 bool sorted = true; |
1146 for (int i=length-1; i>0; i--) { | |
1147 for (int j=0; j<i; j++) { | |
1148 methodOop m1 = (methodOop)methods->obj_at(j); | |
1149 methodOop m2 = (methodOop)methods->obj_at(j+1); | |
1150 if ((uintptr_t)m1->name() > (uintptr_t)m2->name()) { | |
1151 methods->obj_at_put(j, m2); | |
1152 methods->obj_at_put(j+1, m1); | |
1153 sorted = false; | |
1154 } | |
1155 } | |
1156 if (sorted) break; | |
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1157 sorted = true; |
0 | 1158 } |
1159 } else { | |
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1160 // XXX This doesn't work for UseCompressedOops because the compare fn |
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1161 // will have to decode the methodOop anyway making it not much faster |
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1162 // than above. |
0 | 1163 compareFn compare = (compareFn) (idempotent ? method_compare_idempotent : method_compare); |
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1164 qsort(methods->base(), length, heapOopSize, compare); |
0 | 1165 } |
1166 | |
1167 // Sort annotations if necessary | |
1168 assert(methods_annotations == NULL || methods_annotations->length() == methods->length(), ""); | |
1169 assert(methods_parameter_annotations == NULL || methods_parameter_annotations->length() == methods->length(), ""); | |
1170 assert(methods_default_annotations == NULL || methods_default_annotations->length() == methods->length(), ""); | |
1171 if (do_annotations) { | |
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1172 ResourceMark rm; |
0 | 1173 // Allocate temporary storage |
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1174 GrowableArray<oop>* temp_array = new GrowableArray<oop>(length); |
0 | 1175 reorder_based_on_method_index(methods, methods_annotations, temp_array); |
1176 reorder_based_on_method_index(methods, methods_parameter_annotations, temp_array); | |
1177 reorder_based_on_method_index(methods, methods_default_annotations, temp_array); | |
1178 } | |
1179 | |
1180 // Reset method ordering | |
1181 for (int i = 0; i < length; i++) { | |
1182 methodOop m = (methodOop) methods->obj_at(i); | |
1183 m->set_method_idnum(i); | |
1184 } | |
1185 } | |
1186 } | |
1187 | |
1188 | |
1189 //----------------------------------------------------------------------------------- | |
1190 // Non-product code | |
1191 | |
1192 #ifndef PRODUCT | |
1193 class SignatureTypePrinter : public SignatureTypeNames { | |
1194 private: | |
1195 outputStream* _st; | |
1196 bool _use_separator; | |
1197 | |
1198 void type_name(const char* name) { | |
1199 if (_use_separator) _st->print(", "); | |
1200 _st->print(name); | |
1201 _use_separator = true; | |
1202 } | |
1203 | |
1204 public: | |
1205 SignatureTypePrinter(symbolHandle signature, outputStream* st) : SignatureTypeNames(signature) { | |
1206 _st = st; | |
1207 _use_separator = false; | |
1208 } | |
1209 | |
1210 void print_parameters() { _use_separator = false; iterate_parameters(); } | |
1211 void print_returntype() { _use_separator = false; iterate_returntype(); } | |
1212 }; | |
1213 | |
1214 | |
1215 void methodOopDesc::print_name(outputStream* st) { | |
1216 Thread *thread = Thread::current(); | |
1217 ResourceMark rm(thread); | |
1218 SignatureTypePrinter sig(signature(), st); | |
1219 st->print("%s ", is_static() ? "static" : "virtual"); | |
1220 sig.print_returntype(); | |
1221 st->print(" %s.", method_holder()->klass_part()->internal_name()); | |
1222 name()->print_symbol_on(st); | |
1223 st->print("("); | |
1224 sig.print_parameters(); | |
1225 st->print(")"); | |
1226 } | |
1227 | |
1228 | |
1229 void methodOopDesc::print_codes_on(outputStream* st) const { | |
1230 print_codes_on(0, code_size(), st); | |
1231 } | |
1232 | |
1233 void methodOopDesc::print_codes_on(int from, int to, outputStream* st) const { | |
1234 Thread *thread = Thread::current(); | |
1235 ResourceMark rm(thread); | |
1236 methodHandle mh (thread, (methodOop)this); | |
1237 BytecodeStream s(mh); | |
1238 s.set_interval(from, to); | |
1239 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); | |
1240 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); | |
1241 } | |
1242 #endif // not PRODUCT | |
1243 | |
1244 | |
1245 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas | |
1246 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) | |
1247 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used | |
1248 // as end-of-stream terminator. | |
1249 | |
1250 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { | |
1251 // bci and line number does not compress into single byte. | |
1252 // Write out escape character and use regular compression for bci and line number. | |
1253 write_byte((jubyte)0xFF); | |
1254 write_signed_int(bci_delta); | |
1255 write_signed_int(line_delta); | |
1256 } | |
1257 | |
1258 // See comment in methodOop.hpp which explains why this exists. | |
1259 #if defined(_M_AMD64) && MSC_VER >= 1400 | |
1260 #pragma optimize("", off) | |
1261 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { | |
1262 write_pair_inline(bci, line); | |
1263 } | |
1264 #pragma optimize("", on) | |
1265 #endif | |
1266 | |
1267 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { | |
1268 _bci = 0; | |
1269 _line = 0; | |
1270 }; | |
1271 | |
1272 | |
1273 bool CompressedLineNumberReadStream::read_pair() { | |
1274 jubyte next = read_byte(); | |
1275 // Check for terminator | |
1276 if (next == 0) return false; | |
1277 if (next == 0xFF) { | |
1278 // Escape character, regular compression used | |
1279 _bci += read_signed_int(); | |
1280 _line += read_signed_int(); | |
1281 } else { | |
1282 // Single byte compression used | |
1283 _bci += next >> 3; | |
1284 _line += next & 0x7; | |
1285 } | |
1286 return true; | |
1287 } | |
1288 | |
1289 | |
1290 Bytecodes::Code methodOopDesc::orig_bytecode_at(int bci) { | |
1291 BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints(); | |
1292 for (; bp != NULL; bp = bp->next()) { | |
1293 if (bp->match(this, bci)) { | |
1294 return bp->orig_bytecode(); | |
1295 } | |
1296 } | |
1297 ShouldNotReachHere(); | |
1298 return Bytecodes::_shouldnotreachhere; | |
1299 } | |
1300 | |
1301 void methodOopDesc::set_orig_bytecode_at(int bci, Bytecodes::Code code) { | |
1302 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); | |
1303 BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints(); | |
1304 for (; bp != NULL; bp = bp->next()) { | |
1305 if (bp->match(this, bci)) { | |
1306 bp->set_orig_bytecode(code); | |
1307 // and continue, in case there is more than one | |
1308 } | |
1309 } | |
1310 } | |
1311 | |
1312 void methodOopDesc::set_breakpoint(int bci) { | |
1313 instanceKlass* ik = instanceKlass::cast(method_holder()); | |
1314 BreakpointInfo *bp = new BreakpointInfo(this, bci); | |
1315 bp->set_next(ik->breakpoints()); | |
1316 ik->set_breakpoints(bp); | |
1317 // do this last: | |
1318 bp->set(this); | |
1319 } | |
1320 | |
1321 static void clear_matches(methodOop m, int bci) { | |
1322 instanceKlass* ik = instanceKlass::cast(m->method_holder()); | |
1323 BreakpointInfo* prev_bp = NULL; | |
1324 BreakpointInfo* next_bp; | |
1325 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { | |
1326 next_bp = bp->next(); | |
1327 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). | |
1328 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { | |
1329 // do this first: | |
1330 bp->clear(m); | |
1331 // unhook it | |
1332 if (prev_bp != NULL) | |
1333 prev_bp->set_next(next_bp); | |
1334 else | |
1335 ik->set_breakpoints(next_bp); | |
1336 delete bp; | |
1337 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods | |
1338 // at same location. So we have multiple matching (method_index and bci) | |
1339 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one | |
1340 // breakpoint for clear_breakpoint request and keep all other method versions | |
1341 // BreakpointInfo for future clear_breakpoint request. | |
1342 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) | |
1343 // which is being called when class is unloaded. We delete all the Breakpoint | |
1344 // information for all versions of method. We may not correctly restore the original | |
1345 // bytecode in all method versions, but that is ok. Because the class is being unloaded | |
1346 // so these methods won't be used anymore. | |
1347 if (bci >= 0) { | |
1348 break; | |
1349 } | |
1350 } else { | |
1351 // This one is a keeper. | |
1352 prev_bp = bp; | |
1353 } | |
1354 } | |
1355 } | |
1356 | |
1357 void methodOopDesc::clear_breakpoint(int bci) { | |
1358 assert(bci >= 0, ""); | |
1359 clear_matches(this, bci); | |
1360 } | |
1361 | |
1362 void methodOopDesc::clear_all_breakpoints() { | |
1363 clear_matches(this, -1); | |
1364 } | |
1365 | |
1366 | |
1367 BreakpointInfo::BreakpointInfo(methodOop m, int bci) { | |
1368 _bci = bci; | |
1369 _name_index = m->name_index(); | |
1370 _signature_index = m->signature_index(); | |
1371 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); | |
1372 if (_orig_bytecode == Bytecodes::_breakpoint) | |
1373 _orig_bytecode = m->orig_bytecode_at(_bci); | |
1374 _next = NULL; | |
1375 } | |
1376 | |
1377 void BreakpointInfo::set(methodOop method) { | |
1378 #ifdef ASSERT | |
1379 { | |
1380 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); | |
1381 if (code == Bytecodes::_breakpoint) | |
1382 code = method->orig_bytecode_at(_bci); | |
1383 assert(orig_bytecode() == code, "original bytecode must be the same"); | |
1384 } | |
1385 #endif | |
1386 *method->bcp_from(_bci) = Bytecodes::_breakpoint; | |
1387 method->incr_number_of_breakpoints(); | |
1388 SystemDictionary::notice_modification(); | |
1389 { | |
1390 // Deoptimize all dependents on this method | |
1391 Thread *thread = Thread::current(); | |
1392 HandleMark hm(thread); | |
1393 methodHandle mh(thread, method); | |
1394 Universe::flush_dependents_on_method(mh); | |
1395 } | |
1396 } | |
1397 | |
1398 void BreakpointInfo::clear(methodOop method) { | |
1399 *method->bcp_from(_bci) = orig_bytecode(); | |
1400 assert(method->number_of_breakpoints() > 0, "must not go negative"); | |
1401 method->decr_number_of_breakpoints(); | |
1402 } |