Mercurial > hg > truffle
annotate src/share/vm/oops/methodOop.cpp @ 4724:0841c0ec2ed6
7123810: new hotspot build - hs23-b10
Reviewed-by: jcoomes
author | amurillo |
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date | Fri, 23 Dec 2011 15:29:34 -0800 |
parents | f94227b6117b |
children | 04b9a2566eec 0382d2b469b2 |
rev | line source |
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0 | 1 /* |
2142 | 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 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/oopFactory.hpp" | |
37 #include "oops/klassOop.hpp" | |
38 #include "oops/methodDataOop.hpp" | |
39 #include "oops/methodOop.hpp" | |
40 #include "oops/oop.inline.hpp" | |
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41 #include "oops/symbol.hpp" |
1972 | 42 #include "prims/jvmtiExport.hpp" |
43 #include "prims/methodHandleWalk.hpp" | |
44 #include "prims/nativeLookup.hpp" | |
45 #include "runtime/arguments.hpp" | |
46 #include "runtime/compilationPolicy.hpp" | |
47 #include "runtime/frame.inline.hpp" | |
48 #include "runtime/handles.inline.hpp" | |
49 #include "runtime/relocator.hpp" | |
50 #include "runtime/sharedRuntime.hpp" | |
51 #include "runtime/signature.hpp" | |
3779 | 52 #include "utilities/quickSort.hpp" |
1972 | 53 #include "utilities/xmlstream.hpp" |
0 | 54 |
55 | |
56 // Implementation of methodOopDesc | |
57 | |
58 address methodOopDesc::get_i2c_entry() { | |
59 assert(_adapter != NULL, "must have"); | |
60 return _adapter->get_i2c_entry(); | |
61 } | |
62 | |
63 address methodOopDesc::get_c2i_entry() { | |
64 assert(_adapter != NULL, "must have"); | |
65 return _adapter->get_c2i_entry(); | |
66 } | |
67 | |
68 address methodOopDesc::get_c2i_unverified_entry() { | |
69 assert(_adapter != NULL, "must have"); | |
70 return _adapter->get_c2i_unverified_entry(); | |
71 } | |
72 | |
73 char* methodOopDesc::name_and_sig_as_C_string() { | |
74 return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature()); | |
75 } | |
76 | |
77 char* methodOopDesc::name_and_sig_as_C_string(char* buf, int size) { | |
78 return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature(), buf, size); | |
79 } | |
80 | |
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81 char* methodOopDesc::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { |
0 | 82 const char* klass_name = klass->external_name(); |
83 int klass_name_len = (int)strlen(klass_name); | |
84 int method_name_len = method_name->utf8_length(); | |
85 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); | |
86 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); | |
87 strcpy(dest, klass_name); | |
88 dest[klass_name_len] = '.'; | |
89 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); | |
90 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); | |
91 dest[len] = 0; | |
92 return dest; | |
93 } | |
94 | |
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95 char* methodOopDesc::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { |
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96 Symbol* klass_name = klass->name(); |
0 | 97 klass_name->as_klass_external_name(buf, size); |
98 int len = (int)strlen(buf); | |
99 | |
100 if (len < size - 1) { | |
101 buf[len++] = '.'; | |
102 | |
103 method_name->as_C_string(&(buf[len]), size - len); | |
104 len = (int)strlen(buf); | |
105 | |
106 signature->as_C_string(&(buf[len]), size - len); | |
107 } | |
108 | |
109 return buf; | |
110 } | |
111 | |
112 int methodOopDesc::fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS) { | |
113 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) | |
114 const int beg_bci_offset = 0; | |
115 const int end_bci_offset = 1; | |
116 const int handler_bci_offset = 2; | |
117 const int klass_index_offset = 3; | |
118 const int entry_size = 4; | |
119 // access exception table | |
120 typeArrayHandle table (THREAD, constMethod()->exception_table()); | |
121 int length = table->length(); | |
122 assert(length % entry_size == 0, "exception table format has changed"); | |
123 // iterate through all entries sequentially | |
124 constantPoolHandle pool(THREAD, constants()); | |
125 for (int i = 0; i < length; i += entry_size) { | |
126 int beg_bci = table->int_at(i + beg_bci_offset); | |
127 int end_bci = table->int_at(i + end_bci_offset); | |
128 assert(beg_bci <= end_bci, "inconsistent exception table"); | |
129 if (beg_bci <= throw_bci && throw_bci < end_bci) { | |
130 // exception handler bci range covers throw_bci => investigate further | |
131 int handler_bci = table->int_at(i + handler_bci_offset); | |
132 int klass_index = table->int_at(i + klass_index_offset); | |
133 if (klass_index == 0) { | |
134 return handler_bci; | |
135 } else if (ex_klass.is_null()) { | |
136 return handler_bci; | |
137 } else { | |
138 // we know the exception class => get the constraint class | |
139 // this may require loading of the constraint class; if verification | |
140 // fails or some other exception occurs, return handler_bci | |
141 klassOop k = pool->klass_at(klass_index, CHECK_(handler_bci)); | |
142 KlassHandle klass = KlassHandle(THREAD, k); | |
143 assert(klass.not_null(), "klass not loaded"); | |
144 if (ex_klass->is_subtype_of(klass())) { | |
145 return handler_bci; | |
146 } | |
147 } | |
148 } | |
149 } | |
150 | |
151 return -1; | |
152 } | |
153 | |
154 void methodOopDesc::mask_for(int bci, InterpreterOopMap* mask) { | |
155 | |
156 Thread* myThread = Thread::current(); | |
157 methodHandle h_this(myThread, this); | |
158 #ifdef ASSERT | |
159 bool has_capability = myThread->is_VM_thread() || | |
160 myThread->is_ConcurrentGC_thread() || | |
161 myThread->is_GC_task_thread(); | |
162 | |
163 if (!has_capability) { | |
164 if (!VerifyStack && !VerifyLastFrame) { | |
165 // verify stack calls this outside VM thread | |
166 warning("oopmap should only be accessed by the " | |
167 "VM, GC task or CMS threads (or during debugging)"); | |
168 InterpreterOopMap local_mask; | |
169 instanceKlass::cast(method_holder())->mask_for(h_this, bci, &local_mask); | |
170 local_mask.print(); | |
171 } | |
172 } | |
173 #endif | |
174 instanceKlass::cast(method_holder())->mask_for(h_this, bci, mask); | |
175 return; | |
176 } | |
177 | |
178 | |
179 int methodOopDesc::bci_from(address bcp) const { | |
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180 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), "bcp doesn't belong to this method"); |
0 | 181 return bcp - code_base(); |
182 } | |
183 | |
184 | |
185 // Return (int)bcx if it appears to be a valid BCI. | |
186 // Return bci_from((address)bcx) if it appears to be a valid BCP. | |
187 // Return -1 otherwise. | |
188 // Used by profiling code, when invalid data is a possibility. | |
189 // The caller is responsible for validating the methodOop itself. | |
190 int methodOopDesc::validate_bci_from_bcx(intptr_t bcx) const { | |
191 // keep bci as -1 if not a valid bci | |
192 int bci = -1; | |
193 if (bcx == 0 || (address)bcx == code_base()) { | |
194 // code_size() may return 0 and we allow 0 here | |
195 // the method may be native | |
196 bci = 0; | |
197 } else if (frame::is_bci(bcx)) { | |
198 if (bcx < code_size()) { | |
199 bci = (int)bcx; | |
200 } | |
201 } else if (contains((address)bcx)) { | |
202 bci = (address)bcx - code_base(); | |
203 } | |
204 // Assert that if we have dodged any asserts, bci is negative. | |
205 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); | |
206 return bci; | |
207 } | |
208 | |
209 address methodOopDesc::bcp_from(int bci) const { | |
210 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci"); | |
211 address bcp = code_base() + bci; | |
212 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); | |
213 return bcp; | |
214 } | |
215 | |
216 | |
217 int methodOopDesc::object_size(bool is_native) { | |
218 // If native, then include pointers for native_function and signature_handler | |
219 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; | |
220 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; | |
221 return align_object_size(header_size() + extra_words); | |
222 } | |
223 | |
224 | |
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225 Symbol* methodOopDesc::klass_name() const { |
0 | 226 klassOop k = method_holder(); |
227 assert(k->is_klass(), "must be klass"); | |
228 instanceKlass* ik = (instanceKlass*) k->klass_part(); | |
229 return ik->name(); | |
230 } | |
231 | |
232 | |
233 void methodOopDesc::set_interpreter_kind() { | |
234 int kind = Interpreter::method_kind(methodOop(this)); | |
235 assert(kind != Interpreter::invalid, | |
236 "interpreter entry must be valid"); | |
237 set_interpreter_kind(kind); | |
238 } | |
239 | |
240 | |
241 // Attempt to return method oop to original state. Clear any pointers | |
242 // (to objects outside the shared spaces). We won't be able to predict | |
243 // where they should point in a new JVM. Further initialize some | |
244 // entries now in order allow them to be write protected later. | |
245 | |
246 void methodOopDesc::remove_unshareable_info() { | |
247 unlink_method(); | |
248 set_interpreter_kind(); | |
249 } | |
250 | |
251 | |
1783 | 252 bool methodOopDesc::was_executed_more_than(int n) { |
0 | 253 // Invocation counter is reset when the methodOop is compiled. |
254 // If the method has compiled code we therefore assume it has | |
255 // be excuted more than n times. | |
256 if (is_accessor() || is_empty_method() || (code() != NULL)) { | |
257 // interpreter doesn't bump invocation counter of trivial methods | |
258 // compiler does not bump invocation counter of compiled methods | |
259 return true; | |
1783 | 260 } |
261 else if (_invocation_counter.carry() || (method_data() != NULL && method_data()->invocation_counter()->carry())) { | |
0 | 262 // The carry bit is set when the counter overflows and causes |
263 // a compilation to occur. We don't know how many times | |
264 // the counter has been reset, so we simply assume it has | |
265 // been executed more than n times. | |
266 return true; | |
267 } else { | |
268 return invocation_count() > n; | |
269 } | |
270 } | |
271 | |
272 #ifndef PRODUCT | |
1783 | 273 void methodOopDesc::print_invocation_count() { |
0 | 274 if (is_static()) tty->print("static "); |
275 if (is_final()) tty->print("final "); | |
276 if (is_synchronized()) tty->print("synchronized "); | |
277 if (is_native()) tty->print("native "); | |
278 method_holder()->klass_part()->name()->print_symbol_on(tty); | |
279 tty->print("."); | |
280 name()->print_symbol_on(tty); | |
281 signature()->print_symbol_on(tty); | |
282 | |
283 if (WizardMode) { | |
284 // dump the size of the byte codes | |
285 tty->print(" {%d}", code_size()); | |
286 } | |
287 tty->cr(); | |
288 | |
289 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); | |
290 tty->print_cr (" invocation_counter: %8d ", invocation_count()); | |
291 tty->print_cr (" backedge_counter: %8d ", backedge_count()); | |
292 if (CountCompiledCalls) { | |
293 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); | |
294 } | |
295 | |
296 } | |
297 #endif | |
298 | |
299 // Build a methodDataOop object to hold information about this method | |
300 // collected in the interpreter. | |
301 void methodOopDesc::build_interpreter_method_data(methodHandle method, TRAPS) { | |
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302 // Do not profile method if current thread holds the pending list lock, |
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303 // which avoids deadlock for acquiring the MethodData_lock. |
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304 if (instanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) { |
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305 return; |
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306 } |
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307 |
0 | 308 // Grab a lock here to prevent multiple |
309 // methodDataOops from being created. | |
310 MutexLocker ml(MethodData_lock, THREAD); | |
311 if (method->method_data() == NULL) { | |
312 methodDataOop method_data = oopFactory::new_methodData(method, CHECK); | |
313 method->set_method_data(method_data); | |
314 if (PrintMethodData && (Verbose || WizardMode)) { | |
315 ResourceMark rm(THREAD); | |
316 tty->print("build_interpreter_method_data for "); | |
317 method->print_name(tty); | |
318 tty->cr(); | |
319 // At the end of the run, the MDO, full of data, will be dumped. | |
320 } | |
321 } | |
322 } | |
323 | |
324 void methodOopDesc::cleanup_inline_caches() { | |
325 // The current system doesn't use inline caches in the interpreter | |
326 // => nothing to do (keep this method around for future use) | |
327 } | |
328 | |
329 | |
710 | 330 int methodOopDesc::extra_stack_words() { |
331 // not an inline function, to avoid a header dependency on Interpreter | |
1506 | 332 return extra_stack_entries() * Interpreter::stackElementSize; |
710 | 333 } |
334 | |
335 | |
0 | 336 void methodOopDesc::compute_size_of_parameters(Thread *thread) { |
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337 ArgumentSizeComputer asc(signature()); |
0 | 338 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); |
339 } | |
340 | |
341 #ifdef CC_INTERP | |
342 void methodOopDesc::set_result_index(BasicType type) { | |
343 _result_index = Interpreter::BasicType_as_index(type); | |
344 } | |
345 #endif | |
346 | |
347 BasicType methodOopDesc::result_type() const { | |
348 ResultTypeFinder rtf(signature()); | |
349 return rtf.type(); | |
350 } | |
351 | |
352 | |
353 bool methodOopDesc::is_empty_method() const { | |
354 return code_size() == 1 | |
355 && *code_base() == Bytecodes::_return; | |
356 } | |
357 | |
358 | |
359 bool methodOopDesc::is_vanilla_constructor() const { | |
360 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method | |
361 // which only calls the superclass vanilla constructor and possibly does stores of | |
362 // zero constants to local fields: | |
363 // | |
364 // aload_0 | |
365 // invokespecial | |
366 // indexbyte1 | |
367 // indexbyte2 | |
368 // | |
369 // followed by an (optional) sequence of: | |
370 // | |
371 // aload_0 | |
372 // aconst_null / iconst_0 / fconst_0 / dconst_0 | |
373 // putfield | |
374 // indexbyte1 | |
375 // indexbyte2 | |
376 // | |
377 // followed by: | |
378 // | |
379 // return | |
380 | |
381 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); | |
382 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); | |
383 int size = code_size(); | |
384 // Check if size match | |
385 if (size == 0 || size % 5 != 0) return false; | |
386 address cb = code_base(); | |
387 int last = size - 1; | |
388 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { | |
389 // Does not call superclass default constructor | |
390 return false; | |
391 } | |
392 // Check optional sequence | |
393 for (int i = 4; i < last; i += 5) { | |
394 if (cb[i] != Bytecodes::_aload_0) return false; | |
395 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; | |
396 if (cb[i+2] != Bytecodes::_putfield) return false; | |
397 } | |
398 return true; | |
399 } | |
400 | |
401 | |
402 bool methodOopDesc::compute_has_loops_flag() { | |
403 BytecodeStream bcs(methodOop(this)); | |
404 Bytecodes::Code bc; | |
405 | |
406 while ((bc = bcs.next()) >= 0) { | |
407 switch( bc ) { | |
408 case Bytecodes::_ifeq: | |
409 case Bytecodes::_ifnull: | |
410 case Bytecodes::_iflt: | |
411 case Bytecodes::_ifle: | |
412 case Bytecodes::_ifne: | |
413 case Bytecodes::_ifnonnull: | |
414 case Bytecodes::_ifgt: | |
415 case Bytecodes::_ifge: | |
416 case Bytecodes::_if_icmpeq: | |
417 case Bytecodes::_if_icmpne: | |
418 case Bytecodes::_if_icmplt: | |
419 case Bytecodes::_if_icmpgt: | |
420 case Bytecodes::_if_icmple: | |
421 case Bytecodes::_if_icmpge: | |
422 case Bytecodes::_if_acmpeq: | |
423 case Bytecodes::_if_acmpne: | |
424 case Bytecodes::_goto: | |
425 case Bytecodes::_jsr: | |
426 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); | |
427 break; | |
428 | |
429 case Bytecodes::_goto_w: | |
430 case Bytecodes::_jsr_w: | |
431 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); | |
432 break; | |
433 } | |
434 } | |
435 _access_flags.set_loops_flag_init(); | |
436 return _access_flags.has_loops(); | |
437 } | |
438 | |
439 | |
440 bool methodOopDesc::is_final_method() const { | |
441 // %%% Should return true for private methods also, | |
442 // since there is no way to override them. | |
443 return is_final() || Klass::cast(method_holder())->is_final(); | |
444 } | |
445 | |
446 | |
447 bool methodOopDesc::is_strict_method() const { | |
448 return is_strict(); | |
449 } | |
450 | |
451 | |
452 bool methodOopDesc::can_be_statically_bound() const { | |
453 if (is_final_method()) return true; | |
454 return vtable_index() == nonvirtual_vtable_index; | |
455 } | |
456 | |
457 | |
458 bool methodOopDesc::is_accessor() const { | |
459 if (code_size() != 5) return false; | |
460 if (size_of_parameters() != 1) return false; | |
2142 | 461 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; |
462 if (java_code_at(1) != Bytecodes::_getfield) return false; | |
463 if (java_code_at(4) != Bytecodes::_areturn && | |
464 java_code_at(4) != Bytecodes::_ireturn ) return false; | |
0 | 465 return true; |
466 } | |
467 | |
468 | |
469 bool methodOopDesc::is_initializer() const { | |
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470 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); |
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471 } |
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472 |
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473 bool methodOopDesc::has_valid_initializer_flags() const { |
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474 return (is_static() || |
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475 instanceKlass::cast(method_holder())->major_version() < 51); |
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476 } |
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477 |
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478 bool methodOopDesc::is_static_initializer() const { |
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479 // For classfiles version 51 or greater, ensure that the clinit method is |
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480 // static. Non-static methods with the name "<clinit>" are not static |
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481 // initializers. (older classfiles exempted for backward compatibility) |
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482 return name() == vmSymbols::class_initializer_name() && |
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483 has_valid_initializer_flags(); |
0 | 484 } |
485 | |
486 | |
487 objArrayHandle methodOopDesc::resolved_checked_exceptions_impl(methodOop this_oop, TRAPS) { | |
488 int length = this_oop->checked_exceptions_length(); | |
489 if (length == 0) { // common case | |
490 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); | |
491 } else { | |
492 methodHandle h_this(THREAD, this_oop); | |
1142 | 493 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); |
0 | 494 objArrayHandle mirrors (THREAD, m_oop); |
495 for (int i = 0; i < length; i++) { | |
496 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe | |
497 klassOop k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); | |
1142 | 498 assert(Klass::cast(k)->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); |
0 | 499 mirrors->obj_at_put(i, Klass::cast(k)->java_mirror()); |
500 } | |
501 return mirrors; | |
502 } | |
503 }; | |
504 | |
505 | |
506 int methodOopDesc::line_number_from_bci(int bci) const { | |
507 if (bci == SynchronizationEntryBCI) bci = 0; | |
508 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); | |
509 int best_bci = 0; | |
510 int best_line = -1; | |
511 | |
512 if (has_linenumber_table()) { | |
513 // The line numbers are a short array of 2-tuples [start_pc, line_number]. | |
514 // Not necessarily sorted and not necessarily one-to-one. | |
515 CompressedLineNumberReadStream stream(compressed_linenumber_table()); | |
516 while (stream.read_pair()) { | |
517 if (stream.bci() == bci) { | |
518 // perfect match | |
519 return stream.line(); | |
520 } else { | |
521 // update best_bci/line | |
522 if (stream.bci() < bci && stream.bci() >= best_bci) { | |
523 best_bci = stream.bci(); | |
524 best_line = stream.line(); | |
525 } | |
526 } | |
527 } | |
528 } | |
529 return best_line; | |
530 } | |
531 | |
532 | |
533 bool methodOopDesc::is_klass_loaded_by_klass_index(int klass_index) const { | |
534 if( _constants->tag_at(klass_index).is_unresolved_klass() ) { | |
535 Thread *thread = Thread::current(); | |
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536 Symbol* klass_name = _constants->klass_name_at(klass_index); |
0 | 537 Handle loader(thread, instanceKlass::cast(method_holder())->class_loader()); |
538 Handle prot (thread, Klass::cast(method_holder())->protection_domain()); | |
539 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; | |
540 } else { | |
541 return true; | |
542 } | |
543 } | |
544 | |
545 | |
546 bool methodOopDesc::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { | |
547 int klass_index = _constants->klass_ref_index_at(refinfo_index); | |
548 if (must_be_resolved) { | |
549 // Make sure klass is resolved in constantpool. | |
550 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; | |
551 } | |
552 return is_klass_loaded_by_klass_index(klass_index); | |
553 } | |
554 | |
555 | |
556 void methodOopDesc::set_native_function(address function, bool post_event_flag) { | |
557 assert(function != NULL, "use clear_native_function to unregister natives"); | |
558 address* native_function = native_function_addr(); | |
559 | |
560 // We can see racers trying to place the same native function into place. Once | |
561 // is plenty. | |
562 address current = *native_function; | |
563 if (current == function) return; | |
564 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && | |
565 function != NULL) { | |
566 // native_method_throw_unsatisfied_link_error_entry() should only | |
567 // be passed when post_event_flag is false. | |
568 assert(function != | |
569 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
570 "post_event_flag mis-match"); | |
571 | |
572 // post the bind event, and possible change the bind function | |
573 JvmtiExport::post_native_method_bind(this, &function); | |
574 } | |
575 *native_function = function; | |
576 // This function can be called more than once. We must make sure that we always | |
577 // use the latest registered method -> check if a stub already has been generated. | |
578 // If so, we have to make it not_entrant. | |
579 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates | |
580 if (nm != NULL) { | |
581 nm->make_not_entrant(); | |
582 } | |
583 } | |
584 | |
585 | |
586 bool methodOopDesc::has_native_function() const { | |
587 address func = native_function(); | |
588 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); | |
589 } | |
590 | |
591 | |
592 void methodOopDesc::clear_native_function() { | |
593 set_native_function( | |
594 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
595 !native_bind_event_is_interesting); | |
596 clear_code(); | |
597 } | |
598 | |
599 | |
600 void methodOopDesc::set_signature_handler(address handler) { | |
601 address* signature_handler = signature_handler_addr(); | |
602 *signature_handler = handler; | |
603 } | |
604 | |
605 | |
606 bool methodOopDesc::is_not_compilable(int comp_level) const { | |
710 | 607 if (is_method_handle_invoke()) { |
608 // compilers must recognize this method specially, or not at all | |
609 return true; | |
610 } | |
1783 | 611 if (number_of_breakpoints() > 0) { |
612 return true; | |
613 } | |
614 if (comp_level == CompLevel_any) { | |
615 return is_not_c1_compilable() || is_not_c2_compilable(); | |
0 | 616 } |
1783 | 617 if (is_c1_compile(comp_level)) { |
618 return is_not_c1_compilable(); | |
619 } | |
620 if (is_c2_compile(comp_level)) { | |
621 return is_not_c2_compilable(); | |
622 } | |
623 return false; | |
0 | 624 } |
625 | |
626 // call this when compiler finds that this method is not compilable | |
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627 void methodOopDesc::set_not_compilable(int comp_level, bool report) { |
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628 if (PrintCompilation && report) { |
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629 ttyLocker ttyl; |
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630 tty->print("made not compilable "); |
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631 this->print_short_name(tty); |
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632 int size = this->code_size(); |
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633 if (size > 0) |
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634 tty->print(" (%d bytes)", size); |
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635 tty->cr(); |
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636 } |
0 | 637 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { |
638 ttyLocker ttyl; | |
639 xtty->begin_elem("make_not_compilable thread='%d'", (int) os::current_thread_id()); | |
640 xtty->method(methodOop(this)); | |
641 xtty->stamp(); | |
642 xtty->end_elem(); | |
643 } | |
1783 | 644 if (comp_level == CompLevel_all) { |
645 set_not_c1_compilable(); | |
646 set_not_c2_compilable(); | |
647 } else { | |
648 if (is_c1_compile(comp_level)) { | |
649 set_not_c1_compilable(); | |
650 } else | |
651 if (is_c2_compile(comp_level)) { | |
652 set_not_c2_compilable(); | |
653 } | |
0 | 654 } |
1783 | 655 CompilationPolicy::policy()->disable_compilation(this); |
0 | 656 } |
657 | |
658 // Revert to using the interpreter and clear out the nmethod | |
659 void methodOopDesc::clear_code() { | |
660 | |
661 // this may be NULL if c2i adapters have not been made yet | |
662 // Only should happen at allocate time. | |
663 if (_adapter == NULL) { | |
664 _from_compiled_entry = NULL; | |
665 } else { | |
666 _from_compiled_entry = _adapter->get_c2i_entry(); | |
667 } | |
668 OrderAccess::storestore(); | |
669 _from_interpreted_entry = _i2i_entry; | |
670 OrderAccess::storestore(); | |
671 _code = NULL; | |
672 } | |
673 | |
674 // Called by class data sharing to remove any entry points (which are not shared) | |
675 void methodOopDesc::unlink_method() { | |
676 _code = NULL; | |
677 _i2i_entry = NULL; | |
678 _from_interpreted_entry = NULL; | |
679 if (is_native()) { | |
680 *native_function_addr() = NULL; | |
681 set_signature_handler(NULL); | |
682 } | |
683 NOT_PRODUCT(set_compiled_invocation_count(0);) | |
684 invocation_counter()->reset(); | |
685 backedge_counter()->reset(); | |
686 _adapter = NULL; | |
687 _from_compiled_entry = NULL; | |
688 assert(_method_data == NULL, "unexpected method data?"); | |
689 set_method_data(NULL); | |
690 set_interpreter_throwout_count(0); | |
691 set_interpreter_invocation_count(0); | |
692 } | |
693 | |
694 // Called when the method_holder is getting linked. Setup entrypoints so the method | |
695 // is ready to be called from interpreter, compiler, and vtables. | |
696 void methodOopDesc::link_method(methodHandle h_method, TRAPS) { | |
3748 | 697 // If the code cache is full, we may reenter this function for the |
698 // leftover methods that weren't linked. | |
699 if (_i2i_entry != NULL) return; | |
700 | |
0 | 701 assert(_adapter == NULL, "init'd to NULL" ); |
702 assert( _code == NULL, "nothing compiled yet" ); | |
703 | |
704 // Setup interpreter entrypoint | |
705 assert(this == h_method(), "wrong h_method()" ); | |
706 address entry = Interpreter::entry_for_method(h_method); | |
707 assert(entry != NULL, "interpreter entry must be non-null"); | |
708 // Sets both _i2i_entry and _from_interpreted_entry | |
709 set_interpreter_entry(entry); | |
710 | 710 if (is_native() && !is_method_handle_invoke()) { |
0 | 711 set_native_function( |
712 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
713 !native_bind_event_is_interesting); | |
714 } | |
715 | |
716 // Setup compiler entrypoint. This is made eagerly, so we do not need | |
717 // special handling of vtables. An alternative is to make adapters more | |
718 // lazily by calling make_adapter() from from_compiled_entry() for the | |
719 // normal calls. For vtable calls life gets more complicated. When a | |
720 // call-site goes mega-morphic we need adapters in all methods which can be | |
721 // called from the vtable. We need adapters on such methods that get loaded | |
722 // later. Ditto for mega-morphic itable calls. If this proves to be a | |
723 // problem we'll make these lazily later. | |
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724 (void) make_adapters(h_method, CHECK); |
0 | 725 |
726 // ONLY USE the h_method now as make_adapter may have blocked | |
727 | |
728 } | |
729 | |
730 address methodOopDesc::make_adapters(methodHandle mh, TRAPS) { | |
731 // Adapters for compiled code are made eagerly here. They are fairly | |
732 // small (generally < 100 bytes) and quick to make (and cached and shared) | |
733 // so making them eagerly shouldn't be too expensive. | |
734 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); | |
735 if (adapter == NULL ) { | |
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736 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); |
0 | 737 } |
738 | |
739 mh->set_adapter_entry(adapter); | |
740 mh->_from_compiled_entry = adapter->get_c2i_entry(); | |
741 return adapter->get_c2i_entry(); | |
742 } | |
743 | |
744 // The verified_code_entry() must be called when a invoke is resolved | |
745 // on this method. | |
746 | |
747 // It returns the compiled code entry point, after asserting not null. | |
748 // This function is called after potential safepoints so that nmethod | |
749 // or adapter that it points to is still live and valid. | |
750 // This function must not hit a safepoint! | |
751 address methodOopDesc::verified_code_entry() { | |
752 debug_only(No_Safepoint_Verifier nsv;) | |
1202 | 753 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); |
754 if (code == NULL && UseCodeCacheFlushing) { | |
755 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this); | |
756 if (saved_code != NULL) { | |
757 methodHandle method(this); | |
758 assert( ! saved_code->is_osr_method(), "should not get here for osr" ); | |
759 set_code( method, saved_code ); | |
760 } | |
761 } | |
762 | |
0 | 763 assert(_from_compiled_entry != NULL, "must be set"); |
764 return _from_compiled_entry; | |
765 } | |
766 | |
767 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all | |
768 // (could be racing a deopt). | |
769 // Not inline to avoid circular ref. | |
770 bool methodOopDesc::check_code() const { | |
771 // cached in a register or local. There's a race on the value of the field. | |
772 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); | |
773 return code == NULL || (code->method() == NULL) || (code->method() == (methodOop)this && !code->is_osr_method()); | |
774 } | |
775 | |
776 // Install compiled code. Instantly it can execute. | |
777 void methodOopDesc::set_code(methodHandle mh, nmethod *code) { | |
778 assert( code, "use clear_code to remove code" ); | |
779 assert( mh->check_code(), "" ); | |
780 | |
781 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); | |
782 | |
783 // These writes must happen in this order, because the interpreter will | |
784 // directly jump to from_interpreted_entry which jumps to an i2c adapter | |
785 // which jumps to _from_compiled_entry. | |
786 mh->_code = code; // Assign before allowing compiled code to exec | |
787 | |
788 int comp_level = code->comp_level(); | |
789 // In theory there could be a race here. In practice it is unlikely | |
790 // and not worth worrying about. | |
1783 | 791 if (comp_level > mh->highest_comp_level()) { |
792 mh->set_highest_comp_level(comp_level); | |
0 | 793 } |
794 | |
795 OrderAccess::storestore(); | |
1692 | 796 #ifdef SHARK |
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797 mh->_from_interpreted_entry = code->insts_begin(); |
1692 | 798 #else |
0 | 799 mh->_from_compiled_entry = code->verified_entry_point(); |
800 OrderAccess::storestore(); | |
801 // Instantly compiled code can execute. | |
802 mh->_from_interpreted_entry = mh->get_i2c_entry(); | |
1692 | 803 #endif // SHARK |
0 | 804 |
805 } | |
806 | |
807 | |
808 bool methodOopDesc::is_overridden_in(klassOop k) const { | |
809 instanceKlass* ik = instanceKlass::cast(k); | |
810 | |
811 if (ik->is_interface()) return false; | |
812 | |
813 // If method is an interface, we skip it - except if it | |
814 // is a miranda method | |
815 if (instanceKlass::cast(method_holder())->is_interface()) { | |
816 // Check that method is not a miranda method | |
817 if (ik->lookup_method(name(), signature()) == NULL) { | |
818 // No implementation exist - so miranda method | |
819 return false; | |
820 } | |
821 return true; | |
822 } | |
823 | |
824 assert(ik->is_subclass_of(method_holder()), "should be subklass"); | |
825 assert(ik->vtable() != NULL, "vtable should exist"); | |
826 if (vtable_index() == nonvirtual_vtable_index) { | |
827 return false; | |
828 } else { | |
829 methodOop vt_m = ik->method_at_vtable(vtable_index()); | |
830 return vt_m != methodOop(this); | |
831 } | |
832 } | |
833 | |
834 | |
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835 // give advice about whether this methodOop should be cached or not |
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836 bool methodOopDesc::should_not_be_cached() const { |
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837 if (is_old()) { |
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838 // This method has been redefined. It is either EMCP or obsolete |
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839 // and we don't want to cache it because that would pin the method |
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840 // down and prevent it from being collectible if and when it |
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841 // finishes executing. |
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842 return true; |
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843 } |
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844 |
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845 if (mark()->should_not_be_cached()) { |
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846 // It is either not safe or not a good idea to cache this |
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847 // method at this time because of the state of the embedded |
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848 // markOop. See markOop.cpp for the gory details. |
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849 return true; |
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850 } |
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851 |
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852 // caching this method should be just fine |
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853 return false; |
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854 } |
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855 |
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856 bool methodOopDesc::is_method_handle_invoke_name(vmSymbols::SID name_sid) { |
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857 switch (name_sid) { |
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858 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeExact_name): |
2460 | 859 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): |
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860 return true; |
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861 } |
2460 | 862 if (AllowInvokeGeneric |
863 && name_sid == vmSymbols::VM_SYMBOL_ENUM_NAME(invokeGeneric_name)) | |
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864 return true; |
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865 return false; |
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866 } |
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867 |
710 | 868 // Constant pool structure for invoke methods: |
869 enum { | |
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870 _imcp_invoke_name = 1, // utf8: 'invokeExact' or 'invokeGeneric' |
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871 _imcp_invoke_signature, // utf8: (variable Symbol*) |
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872 _imcp_method_type_value, // string: (variable java/lang/invoke/MethodType, sic) |
710 | 873 _imcp_limit |
874 }; | |
875 | |
876 oop methodOopDesc::method_handle_type() const { | |
877 if (!is_method_handle_invoke()) { assert(false, "caller resp."); return NULL; } | |
878 oop mt = constants()->resolved_string_at(_imcp_method_type_value); | |
879 assert(mt->klass() == SystemDictionary::MethodType_klass(), ""); | |
880 return mt; | |
881 } | |
882 | |
883 jint* methodOopDesc::method_type_offsets_chain() { | |
884 static jint pchase[] = { -1, -1, -1 }; | |
885 if (pchase[0] == -1) { | |
886 jint step0 = in_bytes(constants_offset()); | |
887 jint step1 = (constantPoolOopDesc::header_size() + _imcp_method_type_value) * HeapWordSize; | |
888 // do this in reverse to avoid races: | |
889 OrderAccess::release_store(&pchase[1], step1); | |
890 OrderAccess::release_store(&pchase[0], step0); | |
891 } | |
892 return pchase; | |
893 } | |
894 | |
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895 //------------------------------------------------------------------------------ |
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896 // methodOopDesc::is_method_handle_adapter |
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897 // |
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898 // Tests if this method is an internal adapter frame from the |
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899 // MethodHandleCompiler. |
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900 // Must be consistent with MethodHandleCompiler::get_method_oop(). |
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901 bool methodOopDesc::is_method_handle_adapter() const { |
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902 if (is_synthetic() && |
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903 !is_native() && // has code from MethodHandleCompiler |
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904 is_method_handle_invoke_name(name()) && |
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905 MethodHandleCompiler::klass_is_method_handle_adapter_holder(method_holder())) { |
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906 assert(!is_method_handle_invoke(), "disjoint"); |
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907 return true; |
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908 } else { |
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909 return false; |
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910 } |
1152
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911 } |
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912 |
710 | 913 methodHandle methodOopDesc::make_invoke_method(KlassHandle holder, |
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914 Symbol* name, |
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915 Symbol* signature, |
710 | 916 Handle method_type, TRAPS) { |
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917 ResourceMark rm; |
710 | 918 methodHandle empty; |
919 | |
920 assert(holder() == SystemDictionary::MethodHandle_klass(), | |
921 "must be a JSR 292 magic type"); | |
922 | |
923 if (TraceMethodHandles) { | |
924 tty->print("Creating invoke method for "); | |
925 signature->print_value(); | |
926 tty->cr(); | |
927 } | |
928 | |
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929 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) |
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930 name->increment_refcount(); |
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931 signature->increment_refcount(); |
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932 |
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933 // record non-BCP method types in the constant pool |
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934 GrowableArray<KlassHandle>* extra_klasses = NULL; |
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935 for (int i = -1, len = java_lang_invoke_MethodType::ptype_count(method_type()); i < len; i++) { |
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936 oop ptype = (i == -1 |
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937 ? java_lang_invoke_MethodType::rtype(method_type()) |
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938 : java_lang_invoke_MethodType::ptype(method_type(), i)); |
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939 klassOop klass = check_non_bcp_klass(java_lang_Class::as_klassOop(ptype)); |
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940 if (klass != NULL) { |
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941 if (extra_klasses == NULL) |
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942 extra_klasses = new GrowableArray<KlassHandle>(len+1); |
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943 bool dup = false; |
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944 for (int j = 0; j < extra_klasses->length(); j++) { |
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945 if (extra_klasses->at(j) == klass) { dup = true; break; } |
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946 } |
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947 if (!dup) |
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948 extra_klasses->append(KlassHandle(THREAD, klass)); |
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949 } |
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950 } |
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951 |
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952 int extra_klass_count = (extra_klasses == NULL ? 0 : extra_klasses->length()); |
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953 int cp_length = _imcp_limit + extra_klass_count; |
710 | 954 constantPoolHandle cp; |
955 { | |
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956 constantPoolOop cp_oop = oopFactory::new_constantPool(cp_length, IsSafeConc, CHECK_(empty)); |
710 | 957 cp = constantPoolHandle(THREAD, cp_oop); |
958 } | |
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959 cp->symbol_at_put(_imcp_invoke_name, name); |
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960 cp->symbol_at_put(_imcp_invoke_signature, signature); |
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961 cp->string_at_put(_imcp_method_type_value, Universe::the_null_string()); |
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962 for (int j = 0; j < extra_klass_count; j++) { |
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963 KlassHandle klass = extra_klasses->at(j); |
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964 cp->klass_at_put(_imcp_limit + j, klass()); |
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965 } |
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966 cp->set_preresolution(); |
710 | 967 cp->set_pool_holder(holder()); |
968 | |
969 // set up the fancy stuff: | |
970 cp->pseudo_string_at_put(_imcp_method_type_value, method_type()); | |
971 methodHandle m; | |
972 { | |
973 int flags_bits = (JVM_MH_INVOKE_BITS | JVM_ACC_PUBLIC | JVM_ACC_FINAL); | |
974 methodOop m_oop = oopFactory::new_method(0, accessFlags_from(flags_bits), | |
975 0, 0, 0, IsSafeConc, CHECK_(empty)); | |
976 m = methodHandle(THREAD, m_oop); | |
977 } | |
978 m->set_constants(cp()); | |
979 m->set_name_index(_imcp_invoke_name); | |
980 m->set_signature_index(_imcp_invoke_signature); | |
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981 assert(is_method_handle_invoke_name(m->name()), ""); |
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982 assert(m->signature() == signature, ""); |
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983 assert(m->is_method_handle_invoke(), ""); |
710 | 984 #ifdef CC_INTERP |
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985 ResultTypeFinder rtf(signature); |
710 | 986 m->set_result_index(rtf.type()); |
987 #endif | |
988 m->compute_size_of_parameters(THREAD); | |
989 m->set_exception_table(Universe::the_empty_int_array()); | |
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990 m->init_intrinsic_id(); |
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991 assert(m->intrinsic_id() == vmIntrinsics::_invokeExact || |
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992 m->intrinsic_id() == vmIntrinsics::_invokeGeneric, "must be an invoker"); |
710 | 993 |
994 // Finally, set up its entry points. | |
995 assert(m->method_handle_type() == method_type(), ""); | |
996 assert(m->can_be_statically_bound(), ""); | |
997 m->set_vtable_index(methodOopDesc::nonvirtual_vtable_index); | |
998 m->link_method(m, CHECK_(empty)); | |
999 | |
1000 #ifdef ASSERT | |
1001 // Make sure the pointer chase works. | |
1002 address p = (address) m(); | |
1003 for (jint* pchase = method_type_offsets_chain(); (*pchase) != -1; pchase++) { | |
1004 p = *(address*)(p + (*pchase)); | |
1005 } | |
1006 assert((oop)p == method_type(), "pointer chase is correct"); | |
1007 #endif | |
1008 | |
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1009 if (TraceMethodHandles && (Verbose || WizardMode)) |
710 | 1010 m->print_on(tty); |
1011 | |
1012 return m; | |
1013 } | |
1014 | |
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1015 klassOop methodOopDesc::check_non_bcp_klass(klassOop klass) { |
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1016 if (klass != NULL && Klass::cast(klass)->class_loader() != NULL) { |
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1017 if (Klass::cast(klass)->oop_is_objArray()) |
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1018 klass = objArrayKlass::cast(klass)->bottom_klass(); |
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1019 return klass; |
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1020 } |
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1021 return NULL; |
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1022 } |
710 | 1023 |
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1024 |
0 | 1025 methodHandle methodOopDesc:: clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, |
1026 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { | |
1027 // Code below does not work for native methods - they should never get rewritten anyway | |
1028 assert(!m->is_native(), "cannot rewrite native methods"); | |
1029 // Allocate new methodOop | |
1030 AccessFlags flags = m->access_flags(); | |
1031 int checked_exceptions_len = m->checked_exceptions_length(); | |
1032 int localvariable_len = m->localvariable_table_length(); | |
518
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1033 // Allocate newm_oop with the is_conc_safe parameter set |
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1034 // to IsUnsafeConc to indicate that newm_oop is not yet |
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1035 // safe for concurrent processing by a GC. |
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1036 methodOop newm_oop = oopFactory::new_method(new_code_length, |
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1037 flags, |
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1038 new_compressed_linenumber_size, |
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1039 localvariable_len, |
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1040 checked_exceptions_len, |
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1041 IsUnsafeConc, |
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1042 CHECK_(methodHandle())); |
0 | 1043 methodHandle newm (THREAD, newm_oop); |
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1044 NOT_PRODUCT(int nmsz = newm->is_parsable() ? newm->size() : -1;) |
0 | 1045 int new_method_size = newm->method_size(); |
1046 // Create a shallow copy of methodOopDesc part, but be careful to preserve the new constMethodOop | |
1047 constMethodOop newcm = newm->constMethod(); | |
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1048 NOT_PRODUCT(int ncmsz = newcm->is_parsable() ? newcm->size() : -1;) |
0 | 1049 int new_const_method_size = newm->constMethod()->object_size(); |
518
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1050 |
0 | 1051 memcpy(newm(), m(), sizeof(methodOopDesc)); |
1052 // Create shallow copy of constMethodOopDesc, but be careful to preserve the methodOop | |
518
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1053 // is_conc_safe is set to false because that is the value of |
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1054 // is_conc_safe initialzied into newcm and the copy should |
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1055 // not overwrite that value. During the window during which it is |
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1056 // tagged as unsafe, some extra work could be needed during precleaning |
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1057 // or concurrent marking but those phases will be correct. Setting and |
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1058 // resetting is done in preference to a careful copying into newcm to |
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1059 // avoid having to know the precise layout of a constMethodOop. |
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1060 m->constMethod()->set_is_conc_safe(oopDesc::IsUnsafeConc); |
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1061 assert(m->constMethod()->is_parsable(), "Should remain parsable"); |
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1062 |
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1063 // NOTE: this is a reachable object that transiently signals "conc_unsafe" |
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1064 // However, no allocations are done during this window |
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1065 // during which it is tagged conc_unsafe, so we are assured that any concurrent |
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1066 // thread will not wait forever for the object to revert to "conc_safe". |
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1067 // Further, any such conc_unsafe object will indicate a stable size |
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1068 // through the transition. |
0 | 1069 memcpy(newcm, m->constMethod(), sizeof(constMethodOopDesc)); |
2226
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1070 m->constMethod()->set_is_conc_safe(oopDesc::IsSafeConc); |
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1071 assert(m->constMethod()->is_parsable(), "Should remain parsable"); |
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1072 |
0 | 1073 // Reset correct method/const method, method size, and parameter info |
1074 newcm->set_method(newm()); | |
1075 newm->set_constMethod(newcm); | |
1076 assert(newcm->method() == newm(), "check"); | |
1077 newm->constMethod()->set_code_size(new_code_length); | |
1078 newm->constMethod()->set_constMethod_size(new_const_method_size); | |
1079 newm->set_method_size(new_method_size); | |
1080 assert(newm->code_size() == new_code_length, "check"); | |
1081 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); | |
1082 assert(newm->localvariable_table_length() == localvariable_len, "check"); | |
1083 // Copy new byte codes | |
1084 memcpy(newm->code_base(), new_code, new_code_length); | |
1085 // Copy line number table | |
1086 if (new_compressed_linenumber_size > 0) { | |
1087 memcpy(newm->compressed_linenumber_table(), | |
1088 new_compressed_linenumber_table, | |
1089 new_compressed_linenumber_size); | |
1090 } | |
1091 // Copy checked_exceptions | |
1092 if (checked_exceptions_len > 0) { | |
1093 memcpy(newm->checked_exceptions_start(), | |
1094 m->checked_exceptions_start(), | |
1095 checked_exceptions_len * sizeof(CheckedExceptionElement)); | |
1096 } | |
1097 // Copy local variable number table | |
1098 if (localvariable_len > 0) { | |
1099 memcpy(newm->localvariable_table_start(), | |
1100 m->localvariable_table_start(), | |
1101 localvariable_len * sizeof(LocalVariableTableElement)); | |
1102 } | |
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1103 |
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1104 // Only set is_conc_safe to true when changes to newcm are |
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1105 // complete. |
2226
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1106 assert(!newm->is_parsable() || nmsz < 0 || newm->size() == nmsz, "newm->size() inconsistency"); |
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1107 assert(!newcm->is_parsable() || ncmsz < 0 || newcm->size() == ncmsz, "newcm->size() inconsistency"); |
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1108 newcm->set_is_conc_safe(true); |
0 | 1109 return newm; |
1110 } | |
1111 | |
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1112 vmSymbols::SID methodOopDesc::klass_id_for_intrinsics(klassOop holder) { |
0 | 1113 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics |
1114 // because we are not loading from core libraries | |
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1115 if (instanceKlass::cast(holder)->class_loader() != NULL) |
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1116 return vmSymbols::NO_SID; // regardless of name, no intrinsics here |
0 | 1117 |
1118 // see if the klass name is well-known: | |
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1119 Symbol* klass_name = instanceKlass::cast(holder)->name(); |
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1120 return vmSymbols::find_sid(klass_name); |
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1121 } |
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1122 |
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1123 void methodOopDesc::init_intrinsic_id() { |
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1124 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); |
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1125 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); |
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1126 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); |
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1127 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); |
856
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1128 |
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1129 // the klass name is well-known: |
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1130 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); |
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1131 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); |
0 | 1132 |
1133 // ditto for method and signature: | |
1134 vmSymbols::SID name_id = vmSymbols::find_sid(name()); | |
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1135 if (name_id == vmSymbols::NO_SID) return; |
0 | 1136 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); |
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1137 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) |
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1138 && sig_id == vmSymbols::NO_SID) return; |
0 | 1139 jshort flags = access_flags().as_short(); |
1140 | |
856
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1141 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); |
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1142 if (id != vmIntrinsics::_none) { |
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1143 set_intrinsic_id(id); |
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1144 return; |
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1145 } |
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1146 |
0 | 1147 // A few slightly irregular cases: |
1148 switch (klass_id) { | |
1149 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): | |
1150 // Second chance: check in regular Math. | |
1151 switch (name_id) { | |
1152 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): | |
1153 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): | |
1154 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): | |
1155 // pretend it is the corresponding method in the non-strict class: | |
1156 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); | |
856
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1157 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); |
0 | 1158 break; |
1159 } | |
1507
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1160 break; |
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1161 |
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1162 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. |
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1163 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): |
1507
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1164 if (is_static() || !is_native()) break; |
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1165 switch (name_id) { |
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1166 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeGeneric_name): |
2460 | 1167 if (!AllowInvokeGeneric) break; |
1168 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): | |
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1169 id = vmIntrinsics::_invokeGeneric; |
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1170 break; |
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1171 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeExact_name): |
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1172 id = vmIntrinsics::_invokeExact; |
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1173 break; |
1507
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1174 } |
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1175 break; |
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1176 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InvokeDynamic): |
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1177 if (!is_static() || !is_native()) break; |
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1178 id = vmIntrinsics::_invokeDynamic; |
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1179 break; |
0 | 1180 } |
1181 | |
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1182 if (id != vmIntrinsics::_none) { |
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1183 // Set up its iid. It is an alias method. |
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1184 set_intrinsic_id(id); |
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1185 return; |
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1186 } |
0 | 1187 } |
1188 | |
1189 // These two methods are static since a GC may move the methodOopDesc | |
1190 bool methodOopDesc::load_signature_classes(methodHandle m, TRAPS) { | |
1191 bool sig_is_loaded = true; | |
1192 Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader()); | |
1193 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain()); | |
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1194 ResourceMark rm(THREAD); |
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1195 Symbol* signature = m->signature(); |
0 | 1196 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
1197 if (ss.is_object()) { | |
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1198 Symbol* sym = ss.as_symbol(CHECK_(false)); |
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1199 Symbol* name = sym; |
0 | 1200 klassOop klass = SystemDictionary::resolve_or_null(name, class_loader, |
1201 protection_domain, THREAD); | |
104
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1202 // We are loading classes eagerly. If a ClassNotFoundException or |
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1203 // a LinkageError was generated, be sure to ignore it. |
0 | 1204 if (HAS_PENDING_EXCEPTION) { |
1142 | 1205 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || |
1206 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { | |
0 | 1207 CLEAR_PENDING_EXCEPTION; |
1208 } else { | |
1209 return false; | |
1210 } | |
1211 } | |
1212 if( klass == NULL) { sig_is_loaded = false; } | |
1213 } | |
1214 } | |
1215 return sig_is_loaded; | |
1216 } | |
1217 | |
1218 bool methodOopDesc::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { | |
1219 Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader()); | |
1220 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain()); | |
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1221 ResourceMark rm(THREAD); |
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1222 Symbol* signature = m->signature(); |
0 | 1223 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
1224 if (ss.type() == T_OBJECT) { | |
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1225 Symbol* name = ss.as_symbol_or_null(); |
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1226 if (name == NULL) return true; |
0 | 1227 klassOop klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); |
1228 if (klass == NULL) return true; | |
1229 } | |
1230 } | |
1231 return false; | |
1232 } | |
1233 | |
1234 // Exposed so field engineers can debug VM | |
1235 void methodOopDesc::print_short_name(outputStream* st) { | |
1236 ResourceMark rm; | |
1237 #ifdef PRODUCT | |
1238 st->print(" %s::", method_holder()->klass_part()->external_name()); | |
1239 #else | |
1240 st->print(" %s::", method_holder()->klass_part()->internal_name()); | |
1241 #endif | |
1242 name()->print_symbol_on(st); | |
1243 if (WizardMode) signature()->print_symbol_on(st); | |
1244 } | |
1245 | |
1246 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array | |
1247 static void reorder_based_on_method_index(objArrayOop methods, | |
1248 objArrayOop annotations, | |
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1249 GrowableArray<oop>* temp_array) { |
0 | 1250 if (annotations == NULL) { |
1251 return; | |
1252 } | |
1253 | |
1254 int length = methods->length(); | |
1255 int i; | |
1256 // Copy to temp array | |
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1257 temp_array->clear(); |
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1258 for (i = 0; i < length; i++) { |
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1259 temp_array->append(annotations->obj_at(i)); |
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1260 } |
0 | 1261 |
1262 // Copy back using old method indices | |
1263 for (i = 0; i < length; i++) { | |
1264 methodOop m = (methodOop) methods->obj_at(i); | |
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1265 annotations->obj_at_put(i, temp_array->at(m->method_idnum())); |
0 | 1266 } |
1267 } | |
1268 | |
3779 | 1269 // Comparer for sorting an object array containing |
1270 // methodOops. | |
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1271 // Used non-template method_comparator methods since |
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1272 // Visual Studio 2003 compiler generates incorrect |
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1273 // optimized code for it. |
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1274 static int method_comparator_narrowOop(narrowOop a, narrowOop b) { |
3779 | 1275 methodOop m = (methodOop)oopDesc::decode_heap_oop_not_null(a); |
1276 methodOop n = (methodOop)oopDesc::decode_heap_oop_not_null(b); | |
1277 return m->name()->fast_compare(n->name()); | |
1278 } | |
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1279 static int method_comparator_oop(oop a, oop b) { |
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1280 methodOop m = (methodOop)a; |
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1281 methodOop n = (methodOop)b; |
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1282 return m->name()->fast_compare(n->name()); |
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1283 } |
0 | 1284 |
1285 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array | |
1286 void methodOopDesc::sort_methods(objArrayOop methods, | |
1287 objArrayOop methods_annotations, | |
1288 objArrayOop methods_parameter_annotations, | |
1289 objArrayOop methods_default_annotations, | |
1290 bool idempotent) { | |
1291 int length = methods->length(); | |
1292 if (length > 1) { | |
1293 bool do_annotations = false; | |
1294 if (methods_annotations != NULL || | |
1295 methods_parameter_annotations != NULL || | |
1296 methods_default_annotations != NULL) { | |
1297 do_annotations = true; | |
1298 } | |
1299 if (do_annotations) { | |
1300 // Remember current method ordering so we can reorder annotations | |
1301 for (int i = 0; i < length; i++) { | |
1302 methodOop m = (methodOop) methods->obj_at(i); | |
1303 m->set_method_idnum(i); | |
1304 } | |
1305 } | |
3779 | 1306 { |
1307 No_Safepoint_Verifier nsv; | |
1308 if (UseCompressedOops) { | |
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1309 QuickSort::sort<narrowOop>((narrowOop*)(methods->base()), length, method_comparator_narrowOop, idempotent); |
3779 | 1310 } else { |
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1311 QuickSort::sort<oop>((oop*)(methods->base()), length, method_comparator_oop, idempotent); |
0 | 1312 } |
3779 | 1313 if (UseConcMarkSweepGC) { |
1314 // For CMS we need to dirty the cards for the array | |
1315 BarrierSet* bs = Universe::heap()->barrier_set(); | |
1316 assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt"); | |
1317 bs->write_ref_array(methods->base(), length); | |
1318 } | |
0 | 1319 } |
1320 | |
1321 // Sort annotations if necessary | |
1322 assert(methods_annotations == NULL || methods_annotations->length() == methods->length(), ""); | |
1323 assert(methods_parameter_annotations == NULL || methods_parameter_annotations->length() == methods->length(), ""); | |
1324 assert(methods_default_annotations == NULL || methods_default_annotations->length() == methods->length(), ""); | |
1325 if (do_annotations) { | |
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1326 ResourceMark rm; |
0 | 1327 // Allocate temporary storage |
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1328 GrowableArray<oop>* temp_array = new GrowableArray<oop>(length); |
0 | 1329 reorder_based_on_method_index(methods, methods_annotations, temp_array); |
1330 reorder_based_on_method_index(methods, methods_parameter_annotations, temp_array); | |
1331 reorder_based_on_method_index(methods, methods_default_annotations, temp_array); | |
1332 } | |
1333 | |
1334 // Reset method ordering | |
1335 for (int i = 0; i < length; i++) { | |
1336 methodOop m = (methodOop) methods->obj_at(i); | |
1337 m->set_method_idnum(i); | |
1338 } | |
1339 } | |
1340 } | |
1341 | |
1342 | |
1343 //----------------------------------------------------------------------------------- | |
1344 // Non-product code | |
1345 | |
1346 #ifndef PRODUCT | |
1347 class SignatureTypePrinter : public SignatureTypeNames { | |
1348 private: | |
1349 outputStream* _st; | |
1350 bool _use_separator; | |
1351 | |
1352 void type_name(const char* name) { | |
1353 if (_use_separator) _st->print(", "); | |
1354 _st->print(name); | |
1355 _use_separator = true; | |
1356 } | |
1357 | |
1358 public: | |
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1359 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { |
0 | 1360 _st = st; |
1361 _use_separator = false; | |
1362 } | |
1363 | |
1364 void print_parameters() { _use_separator = false; iterate_parameters(); } | |
1365 void print_returntype() { _use_separator = false; iterate_returntype(); } | |
1366 }; | |
1367 | |
1368 | |
1369 void methodOopDesc::print_name(outputStream* st) { | |
1370 Thread *thread = Thread::current(); | |
1371 ResourceMark rm(thread); | |
1372 SignatureTypePrinter sig(signature(), st); | |
1373 st->print("%s ", is_static() ? "static" : "virtual"); | |
1374 sig.print_returntype(); | |
1375 st->print(" %s.", method_holder()->klass_part()->internal_name()); | |
1376 name()->print_symbol_on(st); | |
1377 st->print("("); | |
1378 sig.print_parameters(); | |
1379 st->print(")"); | |
1380 } | |
1381 | |
1382 | |
1383 void methodOopDesc::print_codes_on(outputStream* st) const { | |
1384 print_codes_on(0, code_size(), st); | |
1385 } | |
1386 | |
1387 void methodOopDesc::print_codes_on(int from, int to, outputStream* st) const { | |
1388 Thread *thread = Thread::current(); | |
1389 ResourceMark rm(thread); | |
1390 methodHandle mh (thread, (methodOop)this); | |
1391 BytecodeStream s(mh); | |
1392 s.set_interval(from, to); | |
1393 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); | |
1394 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); | |
1395 } | |
1396 #endif // not PRODUCT | |
1397 | |
1398 | |
1399 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas | |
1400 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) | |
1401 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used | |
1402 // as end-of-stream terminator. | |
1403 | |
1404 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { | |
1405 // bci and line number does not compress into single byte. | |
1406 // Write out escape character and use regular compression for bci and line number. | |
1407 write_byte((jubyte)0xFF); | |
1408 write_signed_int(bci_delta); | |
1409 write_signed_int(line_delta); | |
1410 } | |
1411 | |
1412 // See comment in methodOop.hpp which explains why this exists. | |
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1413 #if defined(_M_AMD64) && _MSC_VER >= 1400 |
0 | 1414 #pragma optimize("", off) |
1415 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { | |
1416 write_pair_inline(bci, line); | |
1417 } | |
1418 #pragma optimize("", on) | |
1419 #endif | |
1420 | |
1421 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { | |
1422 _bci = 0; | |
1423 _line = 0; | |
1424 }; | |
1425 | |
1426 | |
1427 bool CompressedLineNumberReadStream::read_pair() { | |
1428 jubyte next = read_byte(); | |
1429 // Check for terminator | |
1430 if (next == 0) return false; | |
1431 if (next == 0xFF) { | |
1432 // Escape character, regular compression used | |
1433 _bci += read_signed_int(); | |
1434 _line += read_signed_int(); | |
1435 } else { | |
1436 // Single byte compression used | |
1437 _bci += next >> 3; | |
1438 _line += next & 0x7; | |
1439 } | |
1440 return true; | |
1441 } | |
1442 | |
1443 | |
2142 | 1444 Bytecodes::Code methodOopDesc::orig_bytecode_at(int bci) const { |
0 | 1445 BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints(); |
1446 for (; bp != NULL; bp = bp->next()) { | |
1447 if (bp->match(this, bci)) { | |
1448 return bp->orig_bytecode(); | |
1449 } | |
1450 } | |
1451 ShouldNotReachHere(); | |
1452 return Bytecodes::_shouldnotreachhere; | |
1453 } | |
1454 | |
1455 void methodOopDesc::set_orig_bytecode_at(int bci, Bytecodes::Code code) { | |
1456 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); | |
1457 BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints(); | |
1458 for (; bp != NULL; bp = bp->next()) { | |
1459 if (bp->match(this, bci)) { | |
1460 bp->set_orig_bytecode(code); | |
1461 // and continue, in case there is more than one | |
1462 } | |
1463 } | |
1464 } | |
1465 | |
1466 void methodOopDesc::set_breakpoint(int bci) { | |
1467 instanceKlass* ik = instanceKlass::cast(method_holder()); | |
1468 BreakpointInfo *bp = new BreakpointInfo(this, bci); | |
1469 bp->set_next(ik->breakpoints()); | |
1470 ik->set_breakpoints(bp); | |
1471 // do this last: | |
1472 bp->set(this); | |
1473 } | |
1474 | |
1475 static void clear_matches(methodOop m, int bci) { | |
1476 instanceKlass* ik = instanceKlass::cast(m->method_holder()); | |
1477 BreakpointInfo* prev_bp = NULL; | |
1478 BreakpointInfo* next_bp; | |
1479 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { | |
1480 next_bp = bp->next(); | |
1481 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). | |
1482 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { | |
1483 // do this first: | |
1484 bp->clear(m); | |
1485 // unhook it | |
1486 if (prev_bp != NULL) | |
1487 prev_bp->set_next(next_bp); | |
1488 else | |
1489 ik->set_breakpoints(next_bp); | |
1490 delete bp; | |
1491 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods | |
1492 // at same location. So we have multiple matching (method_index and bci) | |
1493 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one | |
1494 // breakpoint for clear_breakpoint request and keep all other method versions | |
1495 // BreakpointInfo for future clear_breakpoint request. | |
1496 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) | |
1497 // which is being called when class is unloaded. We delete all the Breakpoint | |
1498 // information for all versions of method. We may not correctly restore the original | |
1499 // bytecode in all method versions, but that is ok. Because the class is being unloaded | |
1500 // so these methods won't be used anymore. | |
1501 if (bci >= 0) { | |
1502 break; | |
1503 } | |
1504 } else { | |
1505 // This one is a keeper. | |
1506 prev_bp = bp; | |
1507 } | |
1508 } | |
1509 } | |
1510 | |
1511 void methodOopDesc::clear_breakpoint(int bci) { | |
1512 assert(bci >= 0, ""); | |
1513 clear_matches(this, bci); | |
1514 } | |
1515 | |
1516 void methodOopDesc::clear_all_breakpoints() { | |
1517 clear_matches(this, -1); | |
1518 } | |
1519 | |
1520 | |
1783 | 1521 int methodOopDesc::invocation_count() { |
1522 if (TieredCompilation) { | |
1523 const methodDataOop mdo = method_data(); | |
1524 if (invocation_counter()->carry() || ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { | |
1525 return InvocationCounter::count_limit; | |
1526 } else { | |
1527 return invocation_counter()->count() + ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); | |
1528 } | |
1529 } else { | |
1530 return invocation_counter()->count(); | |
1531 } | |
1532 } | |
1533 | |
1534 int methodOopDesc::backedge_count() { | |
1535 if (TieredCompilation) { | |
1536 const methodDataOop mdo = method_data(); | |
1537 if (backedge_counter()->carry() || ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { | |
1538 return InvocationCounter::count_limit; | |
1539 } else { | |
1540 return backedge_counter()->count() + ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); | |
1541 } | |
1542 } else { | |
1543 return backedge_counter()->count(); | |
1544 } | |
1545 } | |
1546 | |
1547 int methodOopDesc::highest_comp_level() const { | |
1548 methodDataOop mdo = method_data(); | |
1549 if (mdo != NULL) { | |
1550 return mdo->highest_comp_level(); | |
1551 } else { | |
1552 return CompLevel_none; | |
1553 } | |
1554 } | |
1555 | |
1556 int methodOopDesc::highest_osr_comp_level() const { | |
1557 methodDataOop mdo = method_data(); | |
1558 if (mdo != NULL) { | |
1559 return mdo->highest_osr_comp_level(); | |
1560 } else { | |
1561 return CompLevel_none; | |
1562 } | |
1563 } | |
1564 | |
1565 void methodOopDesc::set_highest_comp_level(int level) { | |
1566 methodDataOop mdo = method_data(); | |
1567 if (mdo != NULL) { | |
1568 mdo->set_highest_comp_level(level); | |
1569 } | |
1570 } | |
1571 | |
1572 void methodOopDesc::set_highest_osr_comp_level(int level) { | |
1573 methodDataOop mdo = method_data(); | |
1574 if (mdo != NULL) { | |
1575 mdo->set_highest_osr_comp_level(level); | |
1576 } | |
1577 } | |
1578 | |
0 | 1579 BreakpointInfo::BreakpointInfo(methodOop m, int bci) { |
1580 _bci = bci; | |
1581 _name_index = m->name_index(); | |
1582 _signature_index = m->signature_index(); | |
1583 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); | |
1584 if (_orig_bytecode == Bytecodes::_breakpoint) | |
1585 _orig_bytecode = m->orig_bytecode_at(_bci); | |
1586 _next = NULL; | |
1587 } | |
1588 | |
1589 void BreakpointInfo::set(methodOop method) { | |
1590 #ifdef ASSERT | |
1591 { | |
1592 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); | |
1593 if (code == Bytecodes::_breakpoint) | |
1594 code = method->orig_bytecode_at(_bci); | |
1595 assert(orig_bytecode() == code, "original bytecode must be the same"); | |
1596 } | |
1597 #endif | |
1598 *method->bcp_from(_bci) = Bytecodes::_breakpoint; | |
1599 method->incr_number_of_breakpoints(); | |
1600 SystemDictionary::notice_modification(); | |
1601 { | |
1602 // Deoptimize all dependents on this method | |
1603 Thread *thread = Thread::current(); | |
1604 HandleMark hm(thread); | |
1605 methodHandle mh(thread, method); | |
1606 Universe::flush_dependents_on_method(mh); | |
1607 } | |
1608 } | |
1609 | |
1610 void BreakpointInfo::clear(methodOop method) { | |
1611 *method->bcp_from(_bci) = orig_bytecode(); | |
1612 assert(method->number_of_breakpoints() > 0, "must not go negative"); | |
1613 method->decr_number_of_breakpoints(); | |
1614 } |