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