1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
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 "classfile/defaultMethods.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "gc/shared/collectedHeap.inline.hpp"
32 #include "interpreter/bytecode.hpp"
33 #include "interpreter/interpreterRuntime.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "logging/log.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/method.hpp"
40 #include "oops/objArrayOop.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/methodHandles.hpp"
43 #include "prims/nativeLookup.hpp"
44 #include "runtime/compilationPolicy.hpp"
45 #include "runtime/fieldDescriptor.hpp"
46 #include "runtime/frame.inline.hpp"
47 #include "runtime/handles.inline.hpp"
48 #include "runtime/reflection.hpp"
49 #include "runtime/signature.hpp"
50 #include "runtime/thread.inline.hpp"
51 #include "runtime/vmThread.hpp"
52
53
54 //------------------------------------------------------------------------------------------------------------------------
55 // Implementation of CallInfo
56
57
58 void CallInfo::set_static(KlassHandle resolved_klass, const methodHandle& resolved_method, TRAPS) {
59 int vtable_index = Method::nonvirtual_vtable_index;
60 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
61 }
62
63
64 void CallInfo::set_interface(KlassHandle resolved_klass,
65 KlassHandle selected_klass,
66 const methodHandle& resolved_method,
67 const methodHandle& selected_method,
68 int itable_index, TRAPS) {
69 // This is only called for interface methods. If the resolved_method
70 // comes from java/lang/Object, it can be the subject of a virtual call, so
71 // we should pick the vtable index from the resolved method.
72 // In that case, the caller must call set_virtual instead of set_interface.
73 assert(resolved_method->method_holder()->is_interface(), "");
74 assert(itable_index == resolved_method()->itable_index(), "");
75 set_common(resolved_klass, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
76 }
77
78 void CallInfo::set_virtual(KlassHandle resolved_klass,
79 KlassHandle selected_klass,
80 const methodHandle& resolved_method,
81 const methodHandle& selected_method,
82 int vtable_index, TRAPS) {
83 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
84 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
85 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
86 set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
87 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
88 }
89
90 void CallInfo::set_handle(const methodHandle& resolved_method,
91 Handle resolved_appendix,
92 Handle resolved_method_type, TRAPS) {
93 if (resolved_method.is_null()) {
94 THROW_MSG(vmSymbols::java_lang_InternalError(), "resolved method is null");
95 }
96 KlassHandle resolved_klass = SystemDictionary::MethodHandle_klass();
97 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
98 resolved_method->is_compiled_lambda_form(),
99 "linkMethod must return one of these");
100 int vtable_index = Method::nonvirtual_vtable_index;
101 assert(!resolved_method->has_vtable_index(), "");
102 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
103 _resolved_appendix = resolved_appendix;
104 _resolved_method_type = resolved_method_type;
105 }
106
107 void CallInfo::set_common(KlassHandle resolved_klass,
108 KlassHandle selected_klass,
109 const methodHandle& resolved_method,
110 const methodHandle& selected_method,
111 CallKind kind,
112 int index,
113 TRAPS) {
114 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
115 _resolved_klass = resolved_klass;
116 _selected_klass = selected_klass;
117 _resolved_method = resolved_method;
118 _selected_method = selected_method;
119 _call_kind = kind;
120 _call_index = index;
121 _resolved_appendix = Handle();
122 DEBUG_ONLY(verify()); // verify before making side effects
123
124 if (CompilationPolicy::must_be_compiled(selected_method)) {
125 // This path is unusual, mostly used by the '-Xcomp' stress test mode.
126
127 // Note: with several active threads, the must_be_compiled may be true
128 // while can_be_compiled is false; remove assert
129 // assert(CompilationPolicy::can_be_compiled(selected_method), "cannot compile");
130 if (!THREAD->can_call_java()) {
131 // don't force compilation, resolve was on behalf of compiler
132 return;
133 }
134 if (selected_method->method_holder()->is_not_initialized()) {
135 // 'is_not_initialized' means not only '!is_initialized', but also that
136 // initialization has not been started yet ('!being_initialized')
137 // Do not force compilation of methods in uninitialized classes.
138 // Note that doing this would throw an assert later,
139 // in CompileBroker::compile_method.
140 // We sometimes use the link resolver to do reflective lookups
141 // even before classes are initialized.
142 return;
143 }
144 CompileBroker::compile_method(selected_method, InvocationEntryBci,
145 CompilationPolicy::policy()->initial_compile_level(),
146 methodHandle(), 0, "must_be_compiled", false, CHECK);
147 }
148 }
149
150 // utility query for unreflecting a method
151 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass) {
152 Klass* resolved_method_holder = resolved_method->method_holder();
153 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
154 resolved_klass = resolved_method_holder;
155 }
156 _resolved_klass = resolved_klass;
157 _selected_klass = resolved_klass;
158 _resolved_method = resolved_method;
159 _selected_method = resolved_method;
160 // classify:
161 CallKind kind = CallInfo::unknown_kind;
162 int index = resolved_method->vtable_index();
163 if (resolved_method->can_be_statically_bound()) {
164 kind = CallInfo::direct_call;
165 } else if (!resolved_method_holder->is_interface()) {
166 // Could be an Object method inherited into an interface, but still a vtable call.
167 kind = CallInfo::vtable_call;
168 } else if (!resolved_klass->is_interface()) {
169 // A default or miranda method. Compute the vtable index.
170 ResourceMark rm;
171 klassVtable* vt = resolved_klass->vtable();
172 index = LinkResolver::vtable_index_of_interface_method(resolved_klass,
173 resolved_method);
174 assert(index >= 0 , "we should have valid vtable index at this point");
175
176 kind = CallInfo::vtable_call;
177 } else if (resolved_method->has_vtable_index()) {
178 // Can occur if an interface redeclares a method of Object.
179
180 #ifdef ASSERT
181 // Ensure that this is really the case.
182 KlassHandle object_klass = SystemDictionary::Object_klass();
183 Method * object_resolved_method = object_klass()->vtable()->method_at(index);
184 assert(object_resolved_method->name() == resolved_method->name(),
185 "Object and interface method names should match at vtable index %d, %s != %s",
186 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string());
187 assert(object_resolved_method->signature() == resolved_method->signature(),
188 "Object and interface method signatures should match at vtable index %d, %s != %s",
189 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string());
190 #endif // ASSERT
191
192 kind = CallInfo::vtable_call;
193 } else {
194 // A regular interface call.
195 kind = CallInfo::itable_call;
196 index = resolved_method->itable_index();
197 }
198 assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index);
199 _call_kind = kind;
200 _call_index = index;
201 _resolved_appendix = Handle();
202 DEBUG_ONLY(verify());
203 }
204
205 #ifdef ASSERT
206 void CallInfo::verify() {
207 switch (call_kind()) { // the meaning and allowed value of index depends on kind
208 case CallInfo::direct_call:
209 if (_call_index == Method::nonvirtual_vtable_index) break;
210 // else fall through to check vtable index:
211 case CallInfo::vtable_call:
212 assert(resolved_klass()->verify_vtable_index(_call_index), "");
213 break;
214 case CallInfo::itable_call:
215 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
216 break;
217 case CallInfo::unknown_kind:
218 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
219 break;
220 default:
221 fatal("Unexpected call kind %d", call_kind());
222 }
223 }
224 #endif //ASSERT
225
226 #ifndef PRODUCT
227 void CallInfo::print() {
228 ResourceMark rm;
229 const char* kindstr = "unknown";
230 switch (_call_kind) {
231 case direct_call: kindstr = "direct"; break;
232 case vtable_call: kindstr = "vtable"; break;
233 case itable_call: kindstr = "itable"; break;
234 }
235 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
236 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
237 }
238 #endif
239
240 //------------------------------------------------------------------------------------------------------------------------
241 // Implementation of LinkInfo
242
243 LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) {
244 // resolve klass
245 Klass* result = pool->klass_ref_at(index, CHECK);
246 _resolved_klass = KlassHandle(THREAD, result);
247
248 // Get name, signature, and static klass
249 _name = pool->name_ref_at(index);
250 _signature = pool->signature_ref_at(index);
251 _current_klass = KlassHandle(THREAD, pool->pool_holder());
252
253 // Coming from the constant pool always checks access
254 _check_access = true;
255 }
256
257 char* LinkInfo::method_string() const {
258 return Method::name_and_sig_as_C_string(_resolved_klass(), _name, _signature);
259 }
260
261 #ifndef PRODUCT
262 void LinkInfo::print() {
263 ResourceMark rm;
264 tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s",
265 _resolved_klass->name()->as_C_string(),
266 _name->as_C_string(),
267 _signature->as_C_string(),
268 _current_klass.is_null() ? "(none)" : _current_klass->name()->as_C_string(),
269 _check_access ? "true" : "false");
270 }
271 #endif // PRODUCT
272 //------------------------------------------------------------------------------------------------------------------------
273 // Klass resolution
274
275 void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) {
276 if (!Reflection::verify_class_access(ref_klass(),
277 sel_klass(),
278 true)) {
279 ResourceMark rm(THREAD);
280 Exceptions::fthrow(
281 THREAD_AND_LOCATION,
282 vmSymbols::java_lang_IllegalAccessError(),
283 "tried to access class %s from class %s",
284 sel_klass->external_name(),
285 ref_klass->external_name()
286 );
287 return;
288 }
289 }
290
291 //------------------------------------------------------------------------------------------------------------------------
292 // Method resolution
293 //
294 // According to JVM spec. $5.4.3c & $5.4.3d
295
296 // Look up method in klasses, including static methods
297 // Then look up local default methods
298 methodHandle LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info,
299 bool checkpolymorphism,
300 bool in_imethod_resolve, TRAPS) {
301 KlassHandle klass = link_info.resolved_klass();
302 Symbol* name = link_info.name();
303 Symbol* signature = link_info.signature();
304
305 // Ignore overpasses so statics can be found during resolution
306 Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass);
307
308 if (klass->is_array_klass()) {
309 // Only consider klass and super klass for arrays
310 return methodHandle(THREAD, result);
311 }
312
313 InstanceKlass* ik = InstanceKlass::cast(klass());
314
315 // JDK 8, JVMS 5.4.3.4: Interface method resolution should
316 // ignore static and non-public methods of java.lang.Object,
317 // like clone, finalize, registerNatives.
318 if (in_imethod_resolve &&
319 result != NULL &&
320 ik->is_interface() &&
321 (result->is_static() || !result->is_public()) &&
322 result->method_holder() == SystemDictionary::Object_klass()) {
323 result = NULL;
324 }
325
326 // Before considering default methods, check for an overpass in the
327 // current class if a method has not been found.
328 if (result == NULL) {
329 result = ik->find_method(name, signature);
330 }
331
332 if (result == NULL) {
333 Array<Method*>* default_methods = ik->default_methods();
334 if (default_methods != NULL) {
335 result = InstanceKlass::find_method(default_methods, name, signature);
336 }
337 }
338
339 if (checkpolymorphism && result != NULL) {
340 vmIntrinsics::ID iid = result->intrinsic_id();
341 if (MethodHandles::is_signature_polymorphic(iid)) {
342 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
343 return NULL;
344 }
345 }
346 return methodHandle(THREAD, result);
347 }
348
349 // returns first instance method
350 // Looks up method in classes, then looks up local default methods
351 methodHandle LinkResolver::lookup_instance_method_in_klasses(KlassHandle klass,
352 Symbol* name,
353 Symbol* signature, TRAPS) {
354 Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass);
355
356 while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) {
357 Klass* super_klass = result->method_holder()->super();
358 result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass);
359 }
360
361 if (klass->is_array_klass()) {
362 // Only consider klass and super klass for arrays
363 return methodHandle(THREAD, result);
364 }
365
366 if (result == NULL) {
367 Array<Method*>* default_methods = InstanceKlass::cast(klass())->default_methods();
368 if (default_methods != NULL) {
369 result = InstanceKlass::find_method(default_methods, name, signature);
370 assert(result == NULL || !result->is_static(), "static defaults not allowed");
371 }
372 }
373 return methodHandle(THREAD, result);
374 }
375
376 int LinkResolver::vtable_index_of_interface_method(KlassHandle klass,
377 const methodHandle& resolved_method) {
378
379 int vtable_index = Method::invalid_vtable_index;
380 Symbol* name = resolved_method->name();
381 Symbol* signature = resolved_method->signature();
382 InstanceKlass* ik = InstanceKlass::cast(klass());
383
384 // First check in default method array
385 if (!resolved_method->is_abstract() && ik->default_methods() != NULL) {
386 int index = InstanceKlass::find_method_index(ik->default_methods(),
387 name, signature, Klass::find_overpass,
388 Klass::find_static, Klass::find_private);
389 if (index >= 0 ) {
390 vtable_index = ik->default_vtable_indices()->at(index);
391 }
392 }
393 if (vtable_index == Method::invalid_vtable_index) {
394 // get vtable_index for miranda methods
395 ResourceMark rm;
396 klassVtable *vt = ik->vtable();
397 vtable_index = vt->index_of_miranda(name, signature);
398 }
399 return vtable_index;
400 }
401
402 methodHandle LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info, TRAPS) {
403 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()());
404
405 // Specify 'true' in order to skip default methods when searching the
406 // interfaces. Function lookup_method_in_klasses() already looked for
407 // the method in the default methods table.
408 return methodHandle(THREAD,
409 ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(),
410 Klass::skip_defaults));
411 }
412
413 methodHandle LinkResolver::lookup_polymorphic_method(
414 const LinkInfo& link_info,
415 Handle *appendix_result_or_null,
416 Handle *method_type_result,
417 TRAPS) {
418 KlassHandle klass = link_info.resolved_klass();
419 Symbol* name = link_info.name();
420 Symbol* full_signature = link_info.signature();
421
422 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
423 if (TraceMethodHandles) {
424 ResourceMark rm(THREAD);
425 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
426 vmIntrinsics::name_at(iid), klass->external_name(),
427 name->as_C_string(), full_signature->as_C_string());
428 }
429 if (klass() == SystemDictionary::MethodHandle_klass() &&
430 iid != vmIntrinsics::_none) {
431 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
432 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
433 // Do not erase last argument type (MemberName) if it is a static linkTo method.
434 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
435 TempNewSymbol basic_signature =
436 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
437 if (TraceMethodHandles) {
438 ResourceMark rm(THREAD);
439 tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
440 name->as_C_string(),
441 full_signature->as_C_string(),
442 basic_signature->as_C_string());
443 }
444 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid,
445 basic_signature,
446 CHECK_NULL);
447 if (result.not_null()) {
448 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
449 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
450 assert(basic_signature == result->signature(), "predict the result signature");
451 if (TraceMethodHandles) {
452 ttyLocker ttyl;
453 tty->print("lookup_polymorphic_method => intrinsic ");
454 result->print_on(tty);
455 }
456 }
457 return result;
458 } else if (iid == vmIntrinsics::_invokeGeneric
459 && THREAD->can_call_java()
460 && appendix_result_or_null != NULL) {
461 // This is a method with type-checking semantics.
462 // We will ask Java code to spin an adapter method for it.
463 if (!MethodHandles::enabled()) {
464 // Make sure the Java part of the runtime has been booted up.
465 Klass* natives = SystemDictionary::MethodHandleNatives_klass();
466 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
467 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
468 Handle(),
469 Handle(),
470 true,
471 CHECK_NULL);
472 }
473 }
474
475 Handle appendix;
476 Handle method_type;
477 methodHandle result = SystemDictionary::find_method_handle_invoker(
478 name,
479 full_signature,
480 link_info.current_klass(),
481 &appendix,
482 &method_type,
483 CHECK_NULL);
484 if (TraceMethodHandles) {
485 ttyLocker ttyl;
486 tty->print("lookup_polymorphic_method => (via Java) ");
487 result->print_on(tty);
488 tty->print(" lookup_polymorphic_method => appendix = ");
489 if (appendix.is_null()) tty->print_cr("(none)");
490 else appendix->print_on(tty);
491 }
492 if (result.not_null()) {
493 #ifdef ASSERT
494 ResourceMark rm(THREAD);
495
496 TempNewSymbol basic_signature =
497 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
498 int actual_size_of_params = result->size_of_parameters();
499 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
500 // +1 for MethodHandle.this, +1 for trailing MethodType
501 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
502 if (appendix.not_null()) expected_size_of_params += 1;
503 if (actual_size_of_params != expected_size_of_params) {
504 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
505 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
506 result->print();
507 }
508 assert(actual_size_of_params == expected_size_of_params,
509 "%d != %d", actual_size_of_params, expected_size_of_params);
510 #endif //ASSERT
511
512 assert(appendix_result_or_null != NULL, "");
513 (*appendix_result_or_null) = appendix;
514 (*method_type_result) = method_type;
515 }
516 return result;
517 }
518 }
519 return NULL;
520 }
521
522 void LinkResolver::check_method_accessability(KlassHandle ref_klass,
523 KlassHandle resolved_klass,
524 KlassHandle sel_klass,
525 const methodHandle& sel_method,
526 TRAPS) {
527
528 AccessFlags flags = sel_method->access_flags();
529
530 // Special case: arrays always override "clone". JVMS 2.15.
531 // If the resolved klass is an array class, and the declaring class
532 // is java.lang.Object and the method is "clone", set the flags
533 // to public.
534 //
535 // We'll check for the method name first, as that's most likely
536 // to be false (so we'll short-circuit out of these tests).
537 if (sel_method->name() == vmSymbols::clone_name() &&
538 sel_klass() == SystemDictionary::Object_klass() &&
539 resolved_klass->is_array_klass()) {
540 // We need to change "protected" to "public".
541 assert(flags.is_protected(), "clone not protected?");
542 jint new_flags = flags.as_int();
543 new_flags = new_flags & (~JVM_ACC_PROTECTED);
544 new_flags = new_flags | JVM_ACC_PUBLIC;
545 flags.set_flags(new_flags);
546 }
547 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
548
549 if (!Reflection::verify_field_access(ref_klass(),
550 resolved_klass(),
551 sel_klass(),
552 flags,
553 true)) {
554 ResourceMark rm(THREAD);
555 Exceptions::fthrow(
556 THREAD_AND_LOCATION,
557 vmSymbols::java_lang_IllegalAccessError(),
558 "tried to access method %s.%s%s from class %s",
559 sel_klass->external_name(),
560 sel_method->name()->as_C_string(),
561 sel_method->signature()->as_C_string(),
562 ref_klass->external_name()
563 );
564 return;
565 }
566 }
567
568 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code,
569 const constantPoolHandle& pool, int index, TRAPS) {
570 // This method is used only
571 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
572 // and
573 // (2) in Bytecode_invoke::static_target
574 // It appears to fail when applied to an invokeinterface call site.
575 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
576 // resolve klass
577 KlassHandle resolved_klass;
578 if (code == Bytecodes::_invokedynamic) {
579 resolved_klass = SystemDictionary::MethodHandle_klass();
580 Symbol* method_name = vmSymbols::invoke_name();
581 Symbol* method_signature = pool->signature_ref_at(index);
582 KlassHandle current_klass(THREAD, pool->pool_holder());
583 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
584 return resolve_method(link_info, /*require_methodref*/false, THREAD);
585 }
586
587 LinkInfo link_info(pool, index, CHECK_NULL);
588 resolved_klass = link_info.resolved_klass();
589
590 if (pool->has_preresolution()
591 || (resolved_klass() == SystemDictionary::MethodHandle_klass() &&
592 MethodHandles::is_signature_polymorphic_name(resolved_klass(), link_info.name()))) {
593 Method* result = ConstantPool::method_at_if_loaded(pool, index);
594 if (result != NULL) {
595 return methodHandle(THREAD, result);
596 }
597 }
598
599 if (code == Bytecodes::_invokeinterface) {
600 return resolve_interface_method(link_info, true, THREAD);
601 } else if (code == Bytecodes::_invokevirtual) {
602 return resolve_method(link_info, /*require_methodref*/true, THREAD);
603 } else if (!resolved_klass->is_interface()) {
604 return resolve_method(link_info, /*require_methodref*/false, THREAD);
605 } else {
606 bool nostatics = (code == Bytecodes::_invokestatic) ? false : true;
607 return resolve_interface_method(link_info, nostatics, THREAD);
608 }
609 }
610
611 // Check and print a loader constraint violation message for method or interface method
612 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
613 const methodHandle& resolved_method,
614 const char* method_type, TRAPS) {
615 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
616 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
617
618 ResourceMark rm(THREAD);
619 Symbol* failed_type_symbol =
620 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
621 resolved_loader, true, CHECK);
622 if (failed_type_symbol != NULL) {
623 const char* msg = "loader constraint violation: when resolving %s"
624 " \"%s\" the class loader (instance of %s) of the current class, %s,"
625 " and the class loader (instance of %s) for the method's defining class, %s, have"
626 " different Class objects for the type %s used in the signature";
627 char* sig = link_info.method_string();
628 const char* loader1_name = SystemDictionary::loader_name(current_loader());
629 char* current = link_info.current_klass()->name()->as_C_string();
630 const char* loader2_name = SystemDictionary::loader_name(resolved_loader());
631 char* target = resolved_method->method_holder()->name()->as_C_string();
632 char* failed_type_name = failed_type_symbol->as_C_string();
633 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) +
634 strlen(current) + strlen(loader2_name) + strlen(target) +
635 strlen(failed_type_name) + strlen(method_type) + 1;
636 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
637 jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name,
638 target, failed_type_name);
639 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
640 }
641 }
642
643 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
644 KlassHandle current_klass,
645 KlassHandle sel_klass, TRAPS) {
646 Handle ref_loader(THREAD, current_klass->class_loader());
647 Handle sel_loader(THREAD, sel_klass->class_loader());
648
649 ResourceMark rm(THREAD); // needed for check_signature_loaders
650 Symbol* failed_type_symbol =
651 SystemDictionary::check_signature_loaders(sig,
652 ref_loader, sel_loader,
653 false,
654 CHECK);
655 if (failed_type_symbol != NULL) {
656 const char* msg = "loader constraint violation: when resolving field"
657 " \"%s\" the class loader (instance of %s) of the referring class, "
658 "%s, and the class loader (instance of %s) for the field's resolved "
659 "type, %s, have different Class objects for that type";
660 char* field_name = field->as_C_string();
661 const char* loader1_name = SystemDictionary::loader_name(ref_loader());
662 char* sel = sel_klass->name()->as_C_string();
663 const char* loader2_name = SystemDictionary::loader_name(sel_loader());
664 char* failed_type_name = failed_type_symbol->as_C_string();
665 size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1_name) +
666 strlen(sel) + strlen(loader2_name) + strlen(failed_type_name) + 1;
667 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
668 jio_snprintf(buf, buflen, msg, field_name, loader1_name, sel, loader2_name,
669 failed_type_name);
670 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
671 }
672 }
673
674 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info,
675 bool require_methodref, TRAPS) {
676
677 Handle nested_exception;
678 KlassHandle resolved_klass = link_info.resolved_klass();
679
680 // 1. check if methodref required, that resolved_klass is not interfacemethodref
681 if (require_methodref && resolved_klass->is_interface()) {
682 ResourceMark rm(THREAD);
683 char buf[200];
684 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
685 resolved_klass()->external_name());
686 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
687 }
688
689 // 2. lookup method in resolved klass and its super klasses
690 methodHandle resolved_method = lookup_method_in_klasses(link_info, true, false, CHECK_NULL);
691
692 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
693 // 3. lookup method in all the interfaces implemented by the resolved klass
694 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
695
696 if (resolved_method.is_null()) {
697 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
698 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD);
699 if (HAS_PENDING_EXCEPTION) {
700 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
701 CLEAR_PENDING_EXCEPTION;
702 }
703 }
704 }
705
706 if (resolved_method.is_null()) {
707 // 4. method lookup failed
708 ResourceMark rm(THREAD);
709 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
710 Method::name_and_sig_as_C_string(resolved_klass(),
711 link_info.name(),
712 link_info.signature()),
713 nested_exception, NULL);
714 }
715
716 // 5. access checks, access checking may be turned off when calling from within the VM.
717 KlassHandle current_klass = link_info.current_klass();
718 if (link_info.check_access()) {
719 assert(current_klass.not_null() , "current_klass should not be null");
720
721 // check if method can be accessed by the referring class
722 check_method_accessability(current_klass,
723 resolved_klass,
724 KlassHandle(THREAD, resolved_method->method_holder()),
725 resolved_method,
726 CHECK_NULL);
727
728 // check loader constraints
729 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
730 }
731
732 return resolved_method;
733 }
734
735 static void trace_method_resolution(const char* prefix,
736 KlassHandle klass,
737 KlassHandle resolved_klass,
738 const methodHandle& method,
739 bool logitables,
740 int index = -1) {
741 #ifndef PRODUCT
742 ResourceMark rm;
743 outputStream* st;
744 if (logitables) {
745 st = LogHandle(itables)::trace_stream();
746 } else {
747 st = LogHandle(vtables)::trace_stream();
748 }
749 st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
750 prefix,
751 (klass.is_null() ? "<NULL>" : klass->internal_name()),
752 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
753 Method::name_and_sig_as_C_string(resolved_klass(),
754 method->name(),
755 method->signature()),
756 method->method_holder()->internal_name());
757 method->print_linkage_flags(st);
758 if (index != -1) {
759 st->print("vtable_index:%d", index);
760 }
761 st->cr();
762 #endif // PRODUCT
763 }
764
765 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info,
766 bool nostatics, TRAPS) {
767
768 KlassHandle resolved_klass = link_info.resolved_klass();
769
770 // check if klass is interface
771 if (!resolved_klass->is_interface()) {
772 ResourceMark rm(THREAD);
773 char buf[200];
774 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass()->external_name());
775 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
776 }
777
778 // lookup method in this interface or its super, java.lang.Object
779 // JDK8: also look for static methods
780 methodHandle resolved_method = lookup_method_in_klasses(link_info, false, true, CHECK_NULL);
781
782 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
783 // lookup method in all the super-interfaces
784 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
785 }
786
787 if (resolved_method.is_null()) {
788 // no method found
789 ResourceMark rm(THREAD);
790 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(),
791 Method::name_and_sig_as_C_string(resolved_klass(),
792 link_info.name(),
793 link_info.signature()));
794 }
795
796 if (link_info.check_access()) {
797 // JDK8 adds non-public interface methods, and accessability check requirement
798 KlassHandle current_klass = link_info.current_klass();
799
800 assert(current_klass.not_null() , "current_klass should not be null");
801
802 // check if method can be accessed by the referring class
803 check_method_accessability(current_klass,
804 resolved_klass,
805 KlassHandle(THREAD, resolved_method->method_holder()),
806 resolved_method,
807 CHECK_NULL);
808
809 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
810 }
811
812 if (nostatics && resolved_method->is_static()) {
813 ResourceMark rm(THREAD);
814 char buf[200];
815 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s",
816 Method::name_and_sig_as_C_string(resolved_klass(),
817 resolved_method->name(), resolved_method->signature()));
818 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
819 }
820
821 if (log_develop_is_enabled(Trace, itables)) {
822 trace_method_resolution("invokeinterface resolved method: caller-class",
823 link_info.current_klass(), resolved_klass,
824 resolved_method, true);
825 }
826
827 return resolved_method;
828 }
829
830 //------------------------------------------------------------------------------------------------------------------------
831 // Field resolution
832
833 void LinkResolver::check_field_accessability(KlassHandle ref_klass,
834 KlassHandle resolved_klass,
835 KlassHandle sel_klass,
836 const fieldDescriptor& fd,
837 TRAPS) {
838 if (!Reflection::verify_field_access(ref_klass(),
839 resolved_klass(),
840 sel_klass(),
841 fd.access_flags(),
842 true)) {
843 ResourceMark rm(THREAD);
844 Exceptions::fthrow(
845 THREAD_AND_LOCATION,
846 vmSymbols::java_lang_IllegalAccessError(),
847 "tried to access field %s.%s from class %s",
848 sel_klass->external_name(),
849 fd.name()->as_C_string(),
850 ref_klass->external_name()
851 );
852 return;
853 }
854 }
855
856 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
857 LinkInfo link_info(pool, index, CHECK);
858 resolve_field(fd, link_info, byte, true, CHECK);
859 }
860
861 void LinkResolver::resolve_field(fieldDescriptor& fd,
862 const LinkInfo& link_info,
863 Bytecodes::Code byte, bool initialize_class,
864 TRAPS) {
865 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
866 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
867 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
868 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
869
870 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
871 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
872 // Check if there's a resolved klass containing the field
873 KlassHandle resolved_klass = link_info.resolved_klass();
874 Symbol* field = link_info.name();
875 Symbol* sig = link_info.signature();
876
877 if (resolved_klass.is_null()) {
878 ResourceMark rm(THREAD);
879 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
880 }
881
882 // Resolve instance field
883 KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd));
884 // check if field exists; i.e., if a klass containing the field def has been selected
885 if (sel_klass.is_null()) {
886 ResourceMark rm(THREAD);
887 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
888 }
889
890 if (!link_info.check_access())
891 // Access checking may be turned off when calling from within the VM.
892 return;
893
894 // check access
895 KlassHandle current_klass = link_info.current_klass();
896 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
897
898 // check for errors
899 if (is_static != fd.is_static()) {
900 ResourceMark rm(THREAD);
901 char msg[200];
902 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass()->external_name(), fd.name()->as_C_string());
903 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
904 }
905
906 // Final fields can only be accessed from its own class.
907 if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) {
908 THROW(vmSymbols::java_lang_IllegalAccessError());
909 }
910
911 // initialize resolved_klass if necessary
912 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
913 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
914 //
915 // note 2: we don't want to force initialization if we are just checking
916 // if the field access is legal; e.g., during compilation
917 if (is_static && initialize_class) {
918 sel_klass->initialize(CHECK);
919 }
920
921 if (sel_klass() != current_klass()) {
922 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
923 }
924
925 // return information. note that the klass is set to the actual klass containing the
926 // field, otherwise access of static fields in superclasses will not work.
927 }
928
929
930 //------------------------------------------------------------------------------------------------------------------------
931 // Invoke resolution
932 //
933 // Naming conventions:
934 //
935 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
936 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
937 // resolved_klass the specified klass (i.e., specified via constant pool index)
938 // recv_klass the receiver klass
939
940
941 void LinkResolver::resolve_static_call(CallInfo& result,
942 const LinkInfo& link_info,
943 bool initialize_class, TRAPS) {
944 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK);
945
946 // The resolved class can change as a result of this resolution.
947 KlassHandle resolved_klass = KlassHandle(THREAD, resolved_method->method_holder());
948
949 Method* save_resolved_method = resolved_method();
950 // Initialize klass (this should only happen if everything is ok)
951 if (initialize_class && resolved_klass->should_be_initialized()) {
952 resolved_klass->initialize(CHECK);
953 // Use updated LinkInfo (to reresolve with resolved_klass as method_holder?)
954 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
955 link_info.current_klass(), link_info.check_access());
956 resolved_method = linktime_resolve_static_method(new_info, CHECK);
957 }
958
959 assert(save_resolved_method == resolved_method(), "does this change?");
960 // setup result
961 result.set_static(resolved_klass, resolved_method, CHECK);
962 }
963
964 // throws linktime exceptions
965 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
966
967 KlassHandle resolved_klass = link_info.resolved_klass();
968 methodHandle resolved_method;
969 if (!resolved_klass->is_interface()) {
970 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
971 } else {
972 resolved_method = resolve_interface_method(link_info, /*nostatics*/false, CHECK_NULL);
973 }
974 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
975
976 // check if static
977 if (!resolved_method->is_static()) {
978 ResourceMark rm(THREAD);
979 char buf[200];
980 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
981 resolved_method->name(),
982 resolved_method->signature()));
983 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
984 }
985 return resolved_method;
986 }
987
988
989 void LinkResolver::resolve_special_call(CallInfo& result,
990 const LinkInfo& link_info,
991 TRAPS) {
992 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK);
993 runtime_resolve_special_method(result, resolved_method,
994 link_info.resolved_klass(),
995 link_info.current_klass(),
996 link_info.check_access(), CHECK);
997 }
998
999 // throws linktime exceptions
1000 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info,
1001 TRAPS) {
1002
1003 // Invokespecial is called for multiple special reasons:
1004 // <init>
1005 // local private method invocation, for classes and interfaces
1006 // superclass.method, which can also resolve to a default method
1007 // and the selected method is recalculated relative to the direct superclass
1008 // superinterface.method, which explicitly does not check shadowing
1009 KlassHandle resolved_klass = link_info.resolved_klass();
1010 methodHandle resolved_method;
1011
1012 if (!resolved_klass->is_interface()) {
1013 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
1014 } else {
1015 resolved_method = resolve_interface_method(link_info, /*nostatics*/true, CHECK_NULL);
1016 }
1017
1018 // check if method name is <init>, that it is found in same klass as static type
1019 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
1020 resolved_method->method_holder() != resolved_klass()) {
1021 ResourceMark rm(THREAD);
1022 Exceptions::fthrow(
1023 THREAD_AND_LOCATION,
1024 vmSymbols::java_lang_NoSuchMethodError(),
1025 "%s: method %s%s not found",
1026 resolved_klass->external_name(),
1027 resolved_method->name()->as_C_string(),
1028 resolved_method->signature()->as_C_string()
1029 );
1030 return NULL;
1031 }
1032
1033 // check if invokespecial's interface method reference is in an indirect superinterface
1034 KlassHandle current_klass = link_info.current_klass();
1035 if (!current_klass.is_null() && resolved_klass->is_interface()) {
1036 Klass *klass_to_check = !InstanceKlass::cast(current_klass())->is_anonymous() ?
1037 current_klass() :
1038 InstanceKlass::cast(current_klass())->host_klass();
1039 // Disable verification for the dynamically-generated reflection bytecodes.
1040 bool is_reflect = klass_to_check->is_subclass_of(
1041 SystemDictionary::reflect_MagicAccessorImpl_klass());
1042
1043 if (!is_reflect &&
1044 !InstanceKlass::cast(klass_to_check)->is_same_or_direct_interface(resolved_klass())) {
1045 ResourceMark rm(THREAD);
1046 char buf[200];
1047 jio_snprintf(buf, sizeof(buf),
1048 "Interface method reference: %s, is in an indirect superinterface of %s",
1049 Method::name_and_sig_as_C_string(resolved_klass(),
1050 resolved_method->name(),
1051 resolved_method->signature()),
1052 current_klass->external_name());
1053 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1054 }
1055 }
1056
1057 // check if not static
1058 if (resolved_method->is_static()) {
1059 ResourceMark rm(THREAD);
1060 char buf[200];
1061 jio_snprintf(buf, sizeof(buf),
1062 "Expecting non-static method %s",
1063 Method::name_and_sig_as_C_string(resolved_klass(),
1064 resolved_method->name(),
1065 resolved_method->signature()));
1066 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1067 }
1068
1069 if (log_develop_is_enabled(Trace, itables)) {
1070 trace_method_resolution("invokespecial resolved method: caller-class:",
1071 current_klass, resolved_klass, resolved_method, true);
1072 }
1073
1074 return resolved_method;
1075 }
1076
1077 // throws runtime exceptions
1078 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1079 const methodHandle& resolved_method,
1080 KlassHandle resolved_klass,
1081 KlassHandle current_klass,
1082 bool check_access, TRAPS) {
1083
1084 // resolved method is selected method unless we have an old-style lookup
1085 // for a superclass method
1086 // Invokespecial for a superinterface, resolved method is selected method,
1087 // no checks for shadowing
1088 methodHandle sel_method(THREAD, resolved_method());
1089
1090 // check if this is an old-style super call and do a new lookup if so
1091 { KlassHandle method_klass = KlassHandle(THREAD,
1092 resolved_method->method_holder());
1093
1094 if (check_access &&
1095 // a) check if ACC_SUPER flag is set for the current class
1096 (current_klass->is_super() || !AllowNonVirtualCalls) &&
1097 // b) check if the class of the resolved_klass is a superclass
1098 // (not supertype in order to exclude interface classes) of the current class.
1099 // This check is not performed for super.invoke for interface methods
1100 // in super interfaces.
1101 current_klass->is_subclass_of(resolved_klass()) &&
1102 current_klass() != resolved_klass() &&
1103 // c) check if the method is not <init>
1104 resolved_method->name() != vmSymbols::object_initializer_name()) {
1105 // Lookup super method
1106 KlassHandle super_klass(THREAD, current_klass->super());
1107 sel_method = lookup_instance_method_in_klasses(super_klass,
1108 resolved_method->name(),
1109 resolved_method->signature(), CHECK);
1110 // check if found
1111 if (sel_method.is_null()) {
1112 ResourceMark rm(THREAD);
1113 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1114 Method::name_and_sig_as_C_string(resolved_klass(),
1115 resolved_method->name(),
1116 resolved_method->signature()));
1117 }
1118 }
1119 }
1120
1121 // check if not static
1122 if (sel_method->is_static()) {
1123 ResourceMark rm(THREAD);
1124 char buf[200];
1125 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1126 resolved_method->name(),
1127 resolved_method->signature()));
1128 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1129 }
1130
1131 // check if abstract
1132 if (sel_method->is_abstract()) {
1133 ResourceMark rm(THREAD);
1134 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1135 Method::name_and_sig_as_C_string(resolved_klass(),
1136 sel_method->name(),
1137 sel_method->signature()));
1138 }
1139
1140 if (log_develop_is_enabled(Trace, itables)) {
1141 trace_method_resolution("invokespecial selected method: resolved-class:",
1142 resolved_klass, resolved_klass, sel_method, true);
1143 }
1144
1145 // setup result
1146 result.set_static(resolved_klass, sel_method, CHECK);
1147 }
1148
1149 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass,
1150 const LinkInfo& link_info,
1151 bool check_null_and_abstract, TRAPS) {
1152 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1153 runtime_resolve_virtual_method(result, resolved_method,
1154 link_info.resolved_klass(),
1155 recv, receiver_klass,
1156 check_null_and_abstract, CHECK);
1157 }
1158
1159 // throws linktime exceptions
1160 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1161 TRAPS) {
1162 // normal method resolution
1163 methodHandle resolved_method = resolve_method(link_info, /*require_methodref*/true, CHECK_NULL);
1164
1165 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1166 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1167
1168 // check if private interface method
1169 KlassHandle resolved_klass = link_info.resolved_klass();
1170 KlassHandle current_klass = link_info.current_klass();
1171
1172 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1173 ResourceMark rm(THREAD);
1174 char buf[200];
1175 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
1176 Method::name_and_sig_as_C_string(resolved_klass(),
1177 resolved_method->name(),
1178 resolved_method->signature()),
1179 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
1180 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1181 }
1182
1183 // check if not static
1184 if (resolved_method->is_static()) {
1185 ResourceMark rm(THREAD);
1186 char buf[200];
1187 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1188 resolved_method->name(),
1189 resolved_method->signature()));
1190 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1191 }
1192
1193 if (log_develop_is_enabled(Trace, vtables)) {
1194 trace_method_resolution("invokevirtual resolved method: caller-class:",
1195 current_klass, resolved_klass, resolved_method, false);
1196 }
1197
1198 return resolved_method;
1199 }
1200
1201 // throws runtime exceptions
1202 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1203 const methodHandle& resolved_method,
1204 KlassHandle resolved_klass,
1205 Handle recv,
1206 KlassHandle recv_klass,
1207 bool check_null_and_abstract,
1208 TRAPS) {
1209
1210 // setup default return values
1211 int vtable_index = Method::invalid_vtable_index;
1212 methodHandle selected_method;
1213
1214 assert(recv.is_null() || recv->is_oop(), "receiver is not an oop");
1215
1216 // runtime method resolution
1217 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1218 THROW(vmSymbols::java_lang_NullPointerException());
1219 }
1220
1221 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1222 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1223 // a missing receiver might result in a bogus lookup.
1224 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1225
1226 // do lookup based on receiver klass using the vtable index
1227 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1228 vtable_index = vtable_index_of_interface_method(resolved_klass,
1229 resolved_method);
1230 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1231
1232 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1233 } else {
1234 // at this point we are sure that resolved_method is virtual and not
1235 // a default or miranda method; therefore, it must have a valid vtable index.
1236 assert(!resolved_method->has_itable_index(), "");
1237 vtable_index = resolved_method->vtable_index();
1238 // We could get a negative vtable_index for final methods,
1239 // because as an optimization they are they are never put in the vtable,
1240 // unless they override an existing method.
1241 // If we do get a negative, it means the resolved method is the the selected
1242 // method, and it can never be changed by an override.
1243 if (vtable_index == Method::nonvirtual_vtable_index) {
1244 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1245 selected_method = resolved_method;
1246 } else {
1247 selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index));
1248 }
1249 }
1250
1251 // check if method exists
1252 if (selected_method.is_null()) {
1253 ResourceMark rm(THREAD);
1254 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1255 Method::name_and_sig_as_C_string(resolved_klass(),
1256 resolved_method->name(),
1257 resolved_method->signature()));
1258 }
1259
1260 // check if abstract
1261 if (check_null_and_abstract && selected_method->is_abstract()) {
1262 ResourceMark rm(THREAD);
1263 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1264 Method::name_and_sig_as_C_string(resolved_klass(),
1265 selected_method->name(),
1266 selected_method->signature()));
1267 }
1268
1269 if (log_develop_is_enabled(Trace, vtables)) {
1270 trace_method_resolution("invokevirtual selected method: receiver-class:",
1271 recv_klass, resolved_klass, selected_method,
1272 false, vtable_index);
1273 }
1274 // setup result
1275 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1276 }
1277
1278 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass,
1279 const LinkInfo& link_info,
1280 bool check_null_and_abstract, TRAPS) {
1281 // throws linktime exceptions
1282 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1283 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(),
1284 recv, recv_klass, check_null_and_abstract, CHECK);
1285 }
1286
1287 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1288 TRAPS) {
1289 // normal interface method resolution
1290 methodHandle resolved_method = resolve_interface_method(link_info, true, CHECK_NULL);
1291 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1292 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1293
1294 return resolved_method;
1295 }
1296
1297 // throws runtime exceptions
1298 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1299 const methodHandle& resolved_method,
1300 KlassHandle resolved_klass,
1301 Handle recv,
1302 KlassHandle recv_klass,
1303 bool check_null_and_abstract, TRAPS) {
1304 // check if receiver exists
1305 if (check_null_and_abstract && recv.is_null()) {
1306 THROW(vmSymbols::java_lang_NullPointerException());
1307 }
1308
1309 // check if private interface method
1310 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1311 ResourceMark rm(THREAD);
1312 char buf[200];
1313 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s",
1314 Method::name_and_sig_as_C_string(resolved_klass(),
1315 resolved_method->name(),
1316 resolved_method->signature()));
1317 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1318 }
1319
1320 // check if receiver klass implements the resolved interface
1321 if (!recv_klass->is_subtype_of(resolved_klass())) {
1322 ResourceMark rm(THREAD);
1323 char buf[200];
1324 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1325 recv_klass()->external_name(),
1326 resolved_klass()->external_name());
1327 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1328 }
1329
1330 // do lookup based on receiver klass
1331 // This search must match the linktime preparation search for itable initialization
1332 // to correctly enforce loader constraints for interface method inheritance
1333 methodHandle sel_method = lookup_instance_method_in_klasses(recv_klass,
1334 resolved_method->name(),
1335 resolved_method->signature(), CHECK);
1336 if (sel_method.is_null() && !check_null_and_abstract) {
1337 // In theory this is a harmless placeholder value, but
1338 // in practice leaving in null affects the nsk default method tests.
1339 // This needs further study.
1340 sel_method = resolved_method;
1341 }
1342 // check if method exists
1343 if (sel_method.is_null()) {
1344 ResourceMark rm(THREAD);
1345 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1346 Method::name_and_sig_as_C_string(recv_klass(),
1347 resolved_method->name(),
1348 resolved_method->signature()));
1349 }
1350 // check access
1351 // Throw Illegal Access Error if sel_method is not public.
1352 if (!sel_method->is_public()) {
1353 ResourceMark rm(THREAD);
1354 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
1355 Method::name_and_sig_as_C_string(recv_klass(),
1356 sel_method->name(),
1357 sel_method->signature()));
1358 }
1359 // check if abstract
1360 if (check_null_and_abstract && sel_method->is_abstract()) {
1361 ResourceMark rm(THREAD);
1362 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1363 Method::name_and_sig_as_C_string(recv_klass(),
1364 sel_method->name(),
1365 sel_method->signature()));
1366 }
1367
1368 if (log_develop_is_enabled(Trace, itables)) {
1369 trace_method_resolution("invokeinterface selected method: receiver-class",
1370 recv_klass, resolved_klass, sel_method, true);
1371 }
1372 // setup result
1373 if (!resolved_method->has_itable_index()) {
1374 int vtable_index = resolved_method->vtable_index();
1375 assert(vtable_index == sel_method->vtable_index(), "sanity check");
1376 result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK);
1377 } else {
1378 int itable_index = resolved_method()->itable_index();
1379 result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK);
1380 }
1381 }
1382
1383
1384 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1385 const LinkInfo& link_info) {
1386 EXCEPTION_MARK;
1387 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD);
1388 if (HAS_PENDING_EXCEPTION) {
1389 CLEAR_PENDING_EXCEPTION;
1390 return methodHandle();
1391 } else {
1392 return method_result;
1393 }
1394 }
1395
1396 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
1397 const LinkInfo& link_info) {
1398 EXCEPTION_MARK;
1399 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD);
1400 if (HAS_PENDING_EXCEPTION) {
1401 CLEAR_PENDING_EXCEPTION;
1402 return methodHandle();
1403 } else {
1404 return method_result;
1405 }
1406 }
1407
1408 methodHandle LinkResolver::resolve_virtual_call_or_null(
1409 KlassHandle receiver_klass,
1410 const LinkInfo& link_info) {
1411 EXCEPTION_MARK;
1412 CallInfo info;
1413 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1414 if (HAS_PENDING_EXCEPTION) {
1415 CLEAR_PENDING_EXCEPTION;
1416 return methodHandle();
1417 }
1418 return info.selected_method();
1419 }
1420
1421 methodHandle LinkResolver::resolve_interface_call_or_null(
1422 KlassHandle receiver_klass,
1423 const LinkInfo& link_info) {
1424 EXCEPTION_MARK;
1425 CallInfo info;
1426 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1427 if (HAS_PENDING_EXCEPTION) {
1428 CLEAR_PENDING_EXCEPTION;
1429 return methodHandle();
1430 }
1431 return info.selected_method();
1432 }
1433
1434 int LinkResolver::resolve_virtual_vtable_index(KlassHandle receiver_klass,
1435 const LinkInfo& link_info) {
1436 EXCEPTION_MARK;
1437 CallInfo info;
1438 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1439 /*check_null_or_abstract*/false, THREAD);
1440 if (HAS_PENDING_EXCEPTION) {
1441 CLEAR_PENDING_EXCEPTION;
1442 return Method::invalid_vtable_index;
1443 }
1444 return info.vtable_index();
1445 }
1446
1447 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1448 EXCEPTION_MARK;
1449 CallInfo info;
1450 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1451 if (HAS_PENDING_EXCEPTION) {
1452 CLEAR_PENDING_EXCEPTION;
1453 return methodHandle();
1454 }
1455 return info.selected_method();
1456 }
1457
1458 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1459 EXCEPTION_MARK;
1460 CallInfo info;
1461 resolve_special_call(info, link_info, THREAD);
1462 if (HAS_PENDING_EXCEPTION) {
1463 CLEAR_PENDING_EXCEPTION;
1464 return methodHandle();
1465 }
1466 return info.selected_method();
1467 }
1468
1469
1470
1471 //------------------------------------------------------------------------------------------------------------------------
1472 // ConstantPool entries
1473
1474 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1475 switch (byte) {
1476 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1477 case Bytecodes::_invokespecial : resolve_invokespecial (result, pool, index, CHECK); break;
1478 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1479 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1480 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1481 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1482 }
1483 return;
1484 }
1485
1486 void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv,
1487 const methodHandle& attached_method,
1488 Bytecodes::Code byte, TRAPS) {
1489 KlassHandle defc = attached_method->method_holder();
1490 Symbol* name = attached_method->name();
1491 Symbol* type = attached_method->signature();
1492 LinkInfo link_info(defc, name, type, KlassHandle(), /*check_access=*/false);
1493 switch(byte) {
1494 case Bytecodes::_invokevirtual:
1495 resolve_virtual_call(result, recv, recv->klass(), link_info,
1496 /*check_null_and_abstract=*/true, CHECK);
1497 break;
1498 case Bytecodes::_invokeinterface:
1499 resolve_interface_call(result, recv, recv->klass(), link_info,
1500 /*check_null_and_abstract=*/true, CHECK);
1501 break;
1502 case Bytecodes::_invokestatic:
1503 resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK);
1504 break;
1505 case Bytecodes::_invokespecial:
1506 resolve_special_call(result, link_info, CHECK);
1507 break;
1508 default:
1509 fatal("bad call: %s", Bytecodes::name(byte));
1510 }
1511 }
1512
1513 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1514 LinkInfo link_info(pool, index, CHECK);
1515 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1516 }
1517
1518
1519 void LinkResolver::resolve_invokespecial(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1520 LinkInfo link_info(pool, index, CHECK);
1521 resolve_special_call(result, link_info, CHECK);
1522 }
1523
1524
1525 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1526 const constantPoolHandle& pool, int index,
1527 TRAPS) {
1528
1529 LinkInfo link_info(pool, index, CHECK);
1530 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1531 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1532 }
1533
1534
1535 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1536 LinkInfo link_info(pool, index, CHECK);
1537 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1538 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1539 }
1540
1541
1542 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1543 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1544 LinkInfo link_info(pool, index, CHECK);
1545 if (TraceMethodHandles) {
1546 ResourceMark rm(THREAD);
1547 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1548 link_info.signature()->as_C_string());
1549 }
1550 resolve_handle_call(result, link_info, CHECK);
1551 }
1552
1553 void LinkResolver::resolve_handle_call(CallInfo& result,
1554 const LinkInfo& link_info,
1555 TRAPS) {
1556 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1557 assert(link_info.resolved_klass()() == SystemDictionary::MethodHandle_klass(), "");
1558 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1559 Handle resolved_appendix;
1560 Handle resolved_method_type;
1561 methodHandle resolved_method = lookup_polymorphic_method(link_info,
1562 &resolved_appendix, &resolved_method_type, CHECK);
1563 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, CHECK);
1564 }
1565
1566 static void wrap_invokedynamic_exception(TRAPS) {
1567 if (HAS_PENDING_EXCEPTION) {
1568 if (TraceMethodHandles) {
1569 tty->print_cr("invokedynamic throws BSME for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION));
1570 PENDING_EXCEPTION->print();
1571 }
1572 if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) {
1573 // throw these guys, since they are already wrapped
1574 return;
1575 }
1576 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1577 // intercept only LinkageErrors which might have failed to wrap
1578 return;
1579 }
1580 // See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS.
1581 Handle nested_exception(THREAD, PENDING_EXCEPTION);
1582 CLEAR_PENDING_EXCEPTION;
1583 THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception)
1584 }
1585 }
1586
1587 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1588 Symbol* method_name = pool->name_ref_at(index);
1589 Symbol* method_signature = pool->signature_ref_at(index);
1590 KlassHandle current_klass = KlassHandle(THREAD, pool->pool_holder());
1591
1592 // Resolve the bootstrap specifier (BSM + optional arguments).
1593 Handle bootstrap_specifier;
1594 // Check if CallSite has been bound already:
1595 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1596 if (cpce->is_f1_null()) {
1597 int pool_index = cpce->constant_pool_index();
1598 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD);
1599 wrap_invokedynamic_exception(CHECK);
1600 assert(bsm_info != NULL, "");
1601 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
1602 bootstrap_specifier = Handle(THREAD, bsm_info);
1603 }
1604 if (!cpce->is_f1_null()) {
1605 methodHandle method( THREAD, cpce->f1_as_method());
1606 Handle appendix( THREAD, cpce->appendix_if_resolved(pool));
1607 Handle method_type(THREAD, cpce->method_type_if_resolved(pool));
1608 result.set_handle(method, appendix, method_type, THREAD);
1609 wrap_invokedynamic_exception(CHECK);
1610 return;
1611 }
1612
1613 if (TraceMethodHandles) {
1614 ResourceMark rm(THREAD);
1615 tty->print_cr("resolve_invokedynamic #%d %s %s in %s",
1616 ConstantPool::decode_invokedynamic_index(index),
1617 method_name->as_C_string(), method_signature->as_C_string(),
1618 current_klass->name()->as_C_string());
1619 tty->print(" BSM info: "); bootstrap_specifier->print();
1620 }
1621
1622 resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK);
1623 }
1624
1625 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1626 Handle bootstrap_specifier,
1627 Symbol* method_name, Symbol* method_signature,
1628 KlassHandle current_klass,
1629 TRAPS) {
1630 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...)
1631 // The appendix argument is likely to be a freshly-created CallSite.
1632 Handle resolved_appendix;
1633 Handle resolved_method_type;
1634 methodHandle resolved_method =
1635 SystemDictionary::find_dynamic_call_site_invoker(current_klass,
1636 bootstrap_specifier,
1637 method_name, method_signature,
1638 &resolved_appendix,
1639 &resolved_method_type,
1640 THREAD);
1641 wrap_invokedynamic_exception(CHECK);
1642 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD);
1643 wrap_invokedynamic_exception(CHECK);
1644 }