1 /*
2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvmci/jvmciEnv.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/codeCache.hpp"
31 #include "code/scopeDesc.hpp"
32 #include "runtime/sweeper.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerOracle.hpp"
36 #include "interpreter/linkResolver.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/oopFactory.hpp"
39 #include "memory/universe.inline.hpp"
40 #include "oops/methodData.hpp"
41 #include "oops/objArrayKlass.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvmtiExport.hpp"
44 #include "runtime/init.hpp"
45 #include "runtime/reflection.hpp"
46 #include "runtime/sharedRuntime.hpp"
47 #include "utilities/dtrace.hpp"
48 #include "jvmci/jvmciRuntime.hpp"
49 #include "jvmci/jvmciJavaClasses.hpp"
50
51 JVMCIEnv::JVMCIEnv(CompileTask* task, int system_dictionary_modification_counter) {
52 _task = task;
53 _system_dictionary_modification_counter = system_dictionary_modification_counter;
54 {
55 // Get Jvmti capabilities under lock to get consistent values.
56 MutexLocker mu(JvmtiThreadState_lock);
57 _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint();
58 _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables();
59 _jvmti_can_post_on_exceptions = JvmtiExport::can_post_on_exceptions();
60 }
61 }
62
63 // ------------------------------------------------------------------
64 // Note: the logic of this method should mirror the logic of
65 // constantPoolOopDesc::verify_constant_pool_resolve.
66 bool JVMCIEnv::check_klass_accessibility(KlassHandle accessing_klass, KlassHandle resolved_klass) {
67 if (accessing_klass->is_objArray_klass()) {
68 accessing_klass = ObjArrayKlass::cast(accessing_klass())->bottom_klass();
69 }
70 if (!accessing_klass->is_instance_klass()) {
71 return true;
72 }
73
74 if (resolved_klass->is_objArray_klass()) {
75 // Find the element klass, if this is an array.
76 resolved_klass = ObjArrayKlass::cast(resolved_klass())->bottom_klass();
77 }
78 if (resolved_klass->is_instance_klass()) {
79 return Reflection::verify_class_access(accessing_klass(), resolved_klass(), true);
80 }
81 return true;
82 }
83
84 // ------------------------------------------------------------------
85 KlassHandle JVMCIEnv::get_klass_by_name_impl(KlassHandle& accessing_klass,
86 const constantPoolHandle& cpool,
87 Symbol* sym,
88 bool require_local) {
89 JVMCI_EXCEPTION_CONTEXT;
90
91 // Now we need to check the SystemDictionary
92 if (sym->byte_at(0) == 'L' &&
93 sym->byte_at(sym->utf8_length()-1) == ';') {
94 // This is a name from a signature. Strip off the trimmings.
95 // Call recursive to keep scope of strippedsym.
96 TempNewSymbol strippedsym = SymbolTable::new_symbol(sym->as_utf8()+1,
97 sym->utf8_length()-2,
98 CHECK_(KlassHandle()));
99 return get_klass_by_name_impl(accessing_klass, cpool, strippedsym, require_local);
100 }
101
102 Handle loader(THREAD, (oop)NULL);
103 Handle domain(THREAD, (oop)NULL);
104 if (!accessing_klass.is_null()) {
105 loader = Handle(THREAD, accessing_klass->class_loader());
106 domain = Handle(THREAD, accessing_klass->protection_domain());
107 }
108
109 KlassHandle found_klass;
110 {
111 ttyUnlocker ttyul; // release tty lock to avoid ordering problems
112 MutexLocker ml(Compile_lock);
113 Klass* kls;
114 if (!require_local) {
115 kls = SystemDictionary::find_constrained_instance_or_array_klass(sym, loader, CHECK_(KlassHandle()));
116 } else {
117 kls = SystemDictionary::find_instance_or_array_klass(sym, loader, domain, CHECK_(KlassHandle()));
118 }
119 found_klass = KlassHandle(THREAD, kls);
120 }
121
122 // If we fail to find an array klass, look again for its element type.
123 // The element type may be available either locally or via constraints.
124 // In either case, if we can find the element type in the system dictionary,
125 // we must build an array type around it. The CI requires array klasses
126 // to be loaded if their element klasses are loaded, except when memory
127 // is exhausted.
128 if (sym->byte_at(0) == '[' &&
129 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {
130 // We have an unloaded array.
131 // Build it on the fly if the element class exists.
132 TempNewSymbol elem_sym = SymbolTable::new_symbol(sym->as_utf8()+1,
133 sym->utf8_length()-1,
134 CHECK_(KlassHandle()));
135
136 // Get element Klass recursively.
137 KlassHandle elem_klass =
138 get_klass_by_name_impl(accessing_klass,
139 cpool,
140 elem_sym,
141 require_local);
142 if (!elem_klass.is_null()) {
143 // Now make an array for it
144 return elem_klass->array_klass(CHECK_(KlassHandle()));
145 }
146 }
147
148 if (found_klass.is_null() && !cpool.is_null() && cpool->has_preresolution()) {
149 // Look inside the constant pool for pre-resolved class entries.
150 for (int i = cpool->length() - 1; i >= 1; i--) {
151 if (cpool->tag_at(i).is_klass()) {
152 Klass* kls = cpool->resolved_klass_at(i);
153 if (kls->name() == sym) {
154 return kls;
155 }
156 }
157 }
158 }
159
160 return found_klass();
161 }
162
163 // ------------------------------------------------------------------
164 KlassHandle JVMCIEnv::get_klass_by_name(KlassHandle& accessing_klass,
165 Symbol* klass_name,
166 bool require_local) {
167 ResourceMark rm;
168 constantPoolHandle cpool;
169 return get_klass_by_name_impl(accessing_klass,
170 cpool,
171 klass_name,
172 require_local);
173 }
174
175 // ------------------------------------------------------------------
176 // Implementation of get_klass_by_index.
177 KlassHandle JVMCIEnv::get_klass_by_index_impl(const constantPoolHandle& cpool,
178 int index,
179 bool& is_accessible,
180 KlassHandle& accessor) {
181 JVMCI_EXCEPTION_CONTEXT;
182 KlassHandle klass (THREAD, ConstantPool::klass_at_if_loaded(cpool, index));
183 Symbol* klass_name = NULL;
184 if (klass.is_null()) {
185 klass_name = cpool->klass_name_at(index);
186 }
187
188 if (klass.is_null()) {
189 // Not found in constant pool. Use the name to do the lookup.
190 KlassHandle k = get_klass_by_name_impl(accessor,
191 cpool,
192 klass_name,
193 false);
194 // Calculate accessibility the hard way.
195 if (k.is_null()) {
196 is_accessible = false;
197 } else if (k->class_loader() != accessor->class_loader() &&
198 get_klass_by_name_impl(accessor, cpool, k->name(), true).is_null()) {
199 // Loaded only remotely. Not linked yet.
200 is_accessible = false;
201 } else {
202 // Linked locally, and we must also check public/private, etc.
203 is_accessible = check_klass_accessibility(accessor, k);
204 }
205 if (!is_accessible) {
206 return KlassHandle();
207 }
208 return k;
209 }
210
211 // It is known to be accessible, since it was found in the constant pool.
212 is_accessible = true;
213 return klass;
214 }
215
216 // ------------------------------------------------------------------
217 // Get a klass from the constant pool.
218 KlassHandle JVMCIEnv::get_klass_by_index(const constantPoolHandle& cpool,
219 int index,
220 bool& is_accessible,
221 KlassHandle& accessor) {
222 ResourceMark rm;
223 KlassHandle result = get_klass_by_index_impl(cpool, index, is_accessible, accessor);
224 return result;
225 }
226
227 // ------------------------------------------------------------------
228 // Implementation of get_field_by_index.
229 //
230 // Implementation note: the results of field lookups are cached
231 // in the accessor klass.
232 void JVMCIEnv::get_field_by_index_impl(instanceKlassHandle& klass, fieldDescriptor& field_desc,
233 int index) {
234 JVMCI_EXCEPTION_CONTEXT;
235
236 assert(klass->is_linked(), "must be linked before using its constant-pool");
237
238 constantPoolHandle cpool(thread, klass->constants());
239
240 // Get the field's name, signature, and type.
241 Symbol* name = cpool->name_ref_at(index);
242
243 int nt_index = cpool->name_and_type_ref_index_at(index);
244 int sig_index = cpool->signature_ref_index_at(nt_index);
245 Symbol* signature = cpool->symbol_at(sig_index);
246
247 // Get the field's declared holder.
248 int holder_index = cpool->klass_ref_index_at(index);
249 bool holder_is_accessible;
250 KlassHandle declared_holder = get_klass_by_index(cpool, holder_index,
251 holder_is_accessible,
252 klass);
253
254 // The declared holder of this field may not have been loaded.
255 // Bail out with partial field information.
256 if (!holder_is_accessible) {
257 return;
258 }
259
260
261 // Perform the field lookup.
262 Klass* canonical_holder =
263 InstanceKlass::cast(declared_holder())->find_field(name, signature, &field_desc);
264 if (canonical_holder == NULL) {
265 return;
266 }
267
268 assert(canonical_holder == field_desc.field_holder(), "just checking");
269 }
270
271 // ------------------------------------------------------------------
272 // Get a field by index from a klass's constant pool.
273 void JVMCIEnv::get_field_by_index(instanceKlassHandle& accessor, fieldDescriptor& fd, int index) {
274 ResourceMark rm;
275 return get_field_by_index_impl(accessor, fd, index);
276 }
277
278 // ------------------------------------------------------------------
279 // Perform an appropriate method lookup based on accessor, holder,
280 // name, signature, and bytecode.
281 methodHandle JVMCIEnv::lookup_method(instanceKlassHandle& h_accessor,
282 instanceKlassHandle& h_holder,
283 Symbol* name,
284 Symbol* sig,
285 Bytecodes::Code bc,
286 constantTag tag) {
287 JVMCI_EXCEPTION_CONTEXT;
288 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL));
289 methodHandle dest_method;
290 LinkInfo link_info(h_holder, name, sig, h_accessor, LinkInfo::needs_access_check, tag);
291 switch (bc) {
292 case Bytecodes::_invokestatic:
293 dest_method =
294 LinkResolver::resolve_static_call_or_null(link_info);
295 break;
296 case Bytecodes::_invokespecial:
297 dest_method =
298 LinkResolver::resolve_special_call_or_null(link_info);
299 break;
300 case Bytecodes::_invokeinterface:
301 dest_method =
302 LinkResolver::linktime_resolve_interface_method_or_null(link_info);
303 break;
304 case Bytecodes::_invokevirtual:
305 dest_method =
306 LinkResolver::linktime_resolve_virtual_method_or_null(link_info);
307 break;
308 default: ShouldNotReachHere();
309 }
310
311 return dest_method;
312 }
313
314
315 // ------------------------------------------------------------------
316 methodHandle JVMCIEnv::get_method_by_index_impl(const constantPoolHandle& cpool,
317 int index, Bytecodes::Code bc,
318 instanceKlassHandle& accessor) {
319 if (bc == Bytecodes::_invokedynamic) {
320 ConstantPoolCacheEntry* cpce = cpool->invokedynamic_cp_cache_entry_at(index);
321 bool is_resolved = !cpce->is_f1_null();
322 if (is_resolved) {
323 // Get the invoker Method* from the constant pool.
324 // (The appendix argument, if any, will be noted in the method's signature.)
325 Method* adapter = cpce->f1_as_method();
326 return methodHandle(adapter);
327 }
328
329 return NULL;
330 }
331
332 int holder_index = cpool->klass_ref_index_at(index);
333 bool holder_is_accessible;
334 KlassHandle holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor);
335
336 // Get the method's name and signature.
337 Symbol* name_sym = cpool->name_ref_at(index);
338 Symbol* sig_sym = cpool->signature_ref_at(index);
339
340 if (cpool->has_preresolution()
341 || (holder() == SystemDictionary::MethodHandle_klass() &&
342 MethodHandles::is_signature_polymorphic_name(holder(), name_sym))) {
343 // Short-circuit lookups for JSR 292-related call sites.
344 // That is, do not rely only on name-based lookups, because they may fail
345 // if the names are not resolvable in the boot class loader (7056328).
346 switch (bc) {
347 case Bytecodes::_invokevirtual:
348 case Bytecodes::_invokeinterface:
349 case Bytecodes::_invokespecial:
350 case Bytecodes::_invokestatic:
351 {
352 Method* m = ConstantPool::method_at_if_loaded(cpool, index);
353 if (m != NULL) {
354 return m;
355 }
356 }
357 break;
358 }
359 }
360
361 if (holder_is_accessible) { // Our declared holder is loaded.
362 instanceKlassHandle lookup = get_instance_klass_for_declared_method_holder(holder);
363 constantTag tag = cpool->tag_ref_at(index);
364 methodHandle m = lookup_method(accessor, lookup, name_sym, sig_sym, bc, tag);
365 if (!m.is_null() &&
366 (bc == Bytecodes::_invokestatic
367 ? InstanceKlass::cast(m->method_holder())->is_not_initialized()
368 : !InstanceKlass::cast(m->method_holder())->is_loaded())) {
369 m = NULL;
370 }
371 if (!m.is_null()) {
372 // We found the method.
373 return m;
374 }
375 }
376
377 // Either the declared holder was not loaded, or the method could
378 // not be found.
379
380 return NULL;
381 }
382
383 // ------------------------------------------------------------------
384 instanceKlassHandle JVMCIEnv::get_instance_klass_for_declared_method_holder(KlassHandle& method_holder) {
385 // For the case of <array>.clone(), the method holder can be an ArrayKlass*
386 // instead of an InstanceKlass*. For that case simply pretend that the
387 // declared holder is Object.clone since that's where the call will bottom out.
388 if (method_holder->is_instance_klass()) {
389 return instanceKlassHandle(method_holder());
390 } else if (method_holder->is_array_klass()) {
391 return instanceKlassHandle(SystemDictionary::Object_klass());
392 } else {
393 ShouldNotReachHere();
394 }
395 return NULL;
396 }
397
398
399 // ------------------------------------------------------------------
400 methodHandle JVMCIEnv::get_method_by_index(const constantPoolHandle& cpool,
401 int index, Bytecodes::Code bc,
402 instanceKlassHandle& accessor) {
403 ResourceMark rm;
404 return get_method_by_index_impl(cpool, index, bc, accessor);
405 }
406
407 // ------------------------------------------------------------------
408 // Check for changes to the system dictionary during compilation
409 // class loads, evolution, breakpoints
410 JVMCIEnv::CodeInstallResult JVMCIEnv::check_for_system_dictionary_modification(Dependencies* dependencies, Handle compiled_code,
411 JVMCIEnv* env, char** failure_detail) {
412 // If JVMTI capabilities were enabled during compile, the compilation is invalidated.
413 if (env != NULL) {
414 if (!env->_jvmti_can_hotswap_or_post_breakpoint && JvmtiExport::can_hotswap_or_post_breakpoint()) {
415 *failure_detail = (char*) "Hotswapping or breakpointing was enabled during compilation";
416 return JVMCIEnv::dependencies_failed;
417 }
418 }
419
420 // Dependencies must be checked when the system dictionary changes
421 // or if we don't know whether it has changed (i.e., env == NULL).
422 // In debug mode, always check dependencies.
423 bool counter_changed = env != NULL && env->_system_dictionary_modification_counter != SystemDictionary::number_of_modifications();
424 bool verify_deps = env == NULL || trueInDebug || JavaAssertions::enabled(SystemDictionary::HotSpotInstalledCode_klass()->name()->as_C_string(), true);
425 if (!counter_changed && !verify_deps) {
426 return JVMCIEnv::ok;
427 }
428
429 for (Dependencies::DepStream deps(dependencies); deps.next(); ) {
430 Klass* witness = deps.check_dependency();
431 if (witness != NULL) {
432 // Use a fixed size buffer to prevent the string stream from
433 // resizing in the context of an inner resource mark.
434 char* buffer = NEW_RESOURCE_ARRAY(char, O_BUFLEN);
435 stringStream st(buffer, O_BUFLEN);
436 deps.print_dependency(witness, true, &st);
437 *failure_detail = st.as_string();
438 if (env == NULL || counter_changed) {
439 return JVMCIEnv::dependencies_failed;
440 } else {
441 // The dependencies were invalid at the time of installation
442 // without any intervening modification of the system
443 // dictionary. That means they were invalidly constructed.
444 return JVMCIEnv::dependencies_invalid;
445 }
446 }
447 if (LogCompilation) {
448 deps.log_dependency();
449 }
450 }
451
452 return JVMCIEnv::ok;
453 }
454
455 // ------------------------------------------------------------------
456 JVMCIEnv::CodeInstallResult JVMCIEnv::register_method(
457 methodHandle& method,
458 nmethod*& nm,
459 int entry_bci,
460 CodeOffsets* offsets,
461 int orig_pc_offset,
462 CodeBuffer* code_buffer,
463 int frame_words,
464 OopMapSet* oop_map_set,
465 ExceptionHandlerTable* handler_table,
466 AbstractCompiler* compiler,
467 DebugInformationRecorder* debug_info,
468 Dependencies* dependencies,
469 JVMCIEnv* env,
470 int compile_id,
471 bool has_unsafe_access,
472 bool has_wide_vector,
473 Handle installed_code,
474 Handle compiled_code,
475 Handle speculation_log) {
476 JVMCI_EXCEPTION_CONTEXT;
477 nm = NULL;
478 int comp_level = CompLevel_full_optimization;
479 char* failure_detail = NULL;
480 JVMCIEnv::CodeInstallResult result;
481 {
482 // To prevent compile queue updates.
483 MutexLocker locker(MethodCompileQueue_lock, THREAD);
484
485 // Prevent SystemDictionary::add_to_hierarchy from running
486 // and invalidating our dependencies until we install this method.
487 MutexLocker ml(Compile_lock);
488
489 // Encode the dependencies now, so we can check them right away.
490 dependencies->encode_content_bytes();
491
492 // Check for {class loads, evolution, breakpoints} during compilation
493 result = check_for_system_dictionary_modification(dependencies, compiled_code, env, &failure_detail);
494 if (result != JVMCIEnv::ok) {
495 // While not a true deoptimization, it is a preemptive decompile.
496 MethodData* mdp = method()->method_data();
497 if (mdp != NULL) {
498 mdp->inc_decompile_count();
499 if (mdp->decompile_count() > (uint)PerMethodRecompilationCutoff) {
500 // TODO (chaeubl) enable this in the fastdebug build only once we are more stable
501 ResourceMark m;
502 tty->print_cr("WARN: endless recompilation of %s. Method was set to not compilable.", method()->name_and_sig_as_C_string());
503 //ShouldNotReachHere();
504 }
505 }
506
507 // All buffers in the CodeBuffer are allocated in the CodeCache.
508 // If the code buffer is created on each compile attempt
509 // as in C2, then it must be freed.
510 //code_buffer->free_blob();
511 } else {
512 ImplicitExceptionTable implicit_tbl;
513 nm = nmethod::new_nmethod(method,
514 compile_id,
515 entry_bci,
516 offsets,
517 orig_pc_offset,
518 debug_info, dependencies, code_buffer,
519 frame_words, oop_map_set,
520 handler_table, &implicit_tbl,
521 compiler, comp_level, installed_code, speculation_log);
522
523 // Free codeBlobs
524 //code_buffer->free_blob();
525 if (nm == NULL) {
526 // The CodeCache is full. Print out warning and disable compilation.
527 {
528 MutexUnlocker ml(Compile_lock);
529 MutexUnlocker locker(MethodCompileQueue_lock);
530 CompileBroker::handle_full_code_cache(CodeCache::get_code_blob_type(comp_level));
531 }
532 } else {
533 nm->set_has_unsafe_access(has_unsafe_access);
534 nm->set_has_wide_vectors(has_wide_vector);
535
536 // Record successful registration.
537 // (Put nm into the task handle *before* publishing to the Java heap.)
538 CompileTask* task = env == NULL ? NULL : env->task();
539 if (task != NULL) task->set_code(nm);
540
541 if (installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(installed_code())) {
542 if (entry_bci == InvocationEntryBci) {
543 if (TieredCompilation) {
544 // If there is an old version we're done with it
545 nmethod* old = method->code();
546 if (TraceMethodReplacement && old != NULL) {
547 ResourceMark rm;
548 char *method_name = method->name_and_sig_as_C_string();
549 tty->print_cr("Replacing method %s", method_name);
550 }
551 if (old != NULL ) {
552 old->make_not_entrant();
553 }
554 }
555 if (TraceNMethodInstalls) {
556 ResourceMark rm;
557 char *method_name = method->name_and_sig_as_C_string();
558 ttyLocker ttyl;
559 tty->print_cr("Installing method (%d) %s [entry point: %p]",
560 comp_level,
561 method_name, nm->entry_point());
562 }
563 // Allow the code to be executed
564 method->set_code(method, nm);
565 } else {
566 if (TraceNMethodInstalls ) {
567 ResourceMark rm;
568 char *method_name = method->name_and_sig_as_C_string();
569 ttyLocker ttyl;
570 tty->print_cr("Installing osr method (%d) %s @ %d",
571 comp_level,
572 method_name,
573 entry_bci);
574 }
575 InstanceKlass::cast(method->method_holder())->add_osr_nmethod(nm);
576 }
577 }
578 }
579 result = nm != NULL ? JVMCIEnv::ok :JVMCIEnv::cache_full;
580 }
581 }
582
583 // String creation must be done outside lock
584 if (failure_detail != NULL) {
585 // A failure to allocate the string is silently ignored.
586 Handle message = java_lang_String::create_from_str(failure_detail, THREAD);
587 HotSpotCompiledNmethod::set_installationFailureMessage(compiled_code, message());
588 }
589
590 // JVMTI -- compiled method notification (must be done outside lock)
591 if (nm != NULL) {
592 nm->post_compiled_method_load_event();
593 }
594
595 return result;
596 }
597