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