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 _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 // 2. lookup method in resolved klass and its super klasses
686 methodHandle resolved_method = lookup_method_in_klasses(link_info, true, false, CHECK_NULL);
687
688 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy
689 // 3. lookup method in all the interfaces implemented by the resolved klass
690 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
691
692 if (resolved_method.is_null()) {
693 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
694 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD);
695 if (HAS_PENDING_EXCEPTION) {
696 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
697 CLEAR_PENDING_EXCEPTION;
698 }
699 }
700 }
701
702 if (resolved_method.is_null()) {
703 // 4. method lookup failed
704 ResourceMark rm(THREAD);
705 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
706 Method::name_and_sig_as_C_string(resolved_klass(),
707 link_info.name(),
708 link_info.signature()),
709 nested_exception, NULL);
710 }
711
712 // 5. access checks, access checking may be turned off when calling from within the VM.
713 KlassHandle current_klass = link_info.current_klass();
714 if (link_info.check_access()) {
715 assert(current_klass.not_null() , "current_klass should not be null");
716
717 // check if method can be accessed by the referring class
718 check_method_accessability(current_klass,
719 resolved_klass,
720 KlassHandle(THREAD, resolved_method->method_holder()),
721 resolved_method,
722 CHECK_NULL);
723
724 // check loader constraints
725 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
726 }
727
728 return resolved_method;
729 }
730
731 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info,
732 bool nostatics, TRAPS) {
733
734 KlassHandle resolved_klass = link_info.resolved_klass();
735
736 // check if klass is interface
737 if (!resolved_klass->is_interface()) {
738 ResourceMark rm(THREAD);
739 char buf[200];
740 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass()->external_name());
741 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
742 }
743
744 // lookup method in this interface or its super, java.lang.Object
745 // JDK8: also look for static methods
746 methodHandle resolved_method = lookup_method_in_klasses(link_info, false, true, CHECK_NULL);
747
748 if (resolved_method.is_null() && !resolved_klass->is_array_klass()) {
749 // lookup method in all the super-interfaces
750 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
751 }
752
753 if (resolved_method.is_null()) {
754 // no method found
755 ResourceMark rm(THREAD);
756 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(),
757 Method::name_and_sig_as_C_string(resolved_klass(),
758 link_info.name(),
759 link_info.signature()));
760 }
761
762 if (link_info.check_access()) {
763 // JDK8 adds non-public interface methods, and accessability check requirement
764 KlassHandle current_klass = link_info.current_klass();
765
766 assert(current_klass.not_null() , "current_klass should not be null");
767
768 // check if method can be accessed by the referring class
769 check_method_accessability(current_klass,
770 resolved_klass,
771 KlassHandle(THREAD, resolved_method->method_holder()),
772 resolved_method,
773 CHECK_NULL);
774
775 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
776 }
777
778 if (nostatics && resolved_method->is_static()) {
779 ResourceMark rm(THREAD);
780 char buf[200];
781 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s",
782 Method::name_and_sig_as_C_string(resolved_klass(),
783 resolved_method->name(), resolved_method->signature()));
784 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
785 }
786
787 if (TraceItables && Verbose) {
788 trace_method_resolution("invokeinterface resolved method: caller-class",
789 link_info.current_klass(), resolved_klass, resolved_method);
790 tty->cr();
791 }
792
793 return resolved_method;
794 }
795
796 //------------------------------------------------------------------------------------------------------------------------
797 // Field resolution
798
799 void LinkResolver::check_field_accessability(KlassHandle ref_klass,
800 KlassHandle resolved_klass,
801 KlassHandle sel_klass,
802 const fieldDescriptor& fd,
803 TRAPS) {
804 if (!Reflection::verify_field_access(ref_klass(),
805 resolved_klass(),
806 sel_klass(),
807 fd.access_flags(),
808 true)) {
809 ResourceMark rm(THREAD);
810 Exceptions::fthrow(
811 THREAD_AND_LOCATION,
812 vmSymbols::java_lang_IllegalAccessError(),
813 "tried to access field %s.%s from class %s",
814 sel_klass->external_name(),
815 fd.name()->as_C_string(),
816 ref_klass->external_name()
817 );
818 return;
819 }
820 }
821
822 void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
823 LinkInfo link_info(pool, index, CHECK);
824 resolve_field(fd, link_info, byte, true, CHECK);
825 }
826
827 void LinkResolver::resolve_field(fieldDescriptor& fd,
828 const LinkInfo& link_info,
829 Bytecodes::Code byte, bool initialize_class,
830 TRAPS) {
831 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
832 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
833 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
834 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
835
836 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
837 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
838 // Check if there's a resolved klass containing the field
839 KlassHandle resolved_klass = link_info.resolved_klass();
840 Symbol* field = link_info.name();
841 Symbol* sig = link_info.signature();
842
843 if (resolved_klass.is_null()) {
844 ResourceMark rm(THREAD);
845 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
846 }
847
848 // Resolve instance field
849 KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd));
850 // check if field exists; i.e., if a klass containing the field def has been selected
851 if (sel_klass.is_null()) {
852 ResourceMark rm(THREAD);
853 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
854 }
855
856 if (!link_info.check_access())
857 // Access checking may be turned off when calling from within the VM.
858 return;
859
860 // check access
861 KlassHandle current_klass = link_info.current_klass();
862 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
863
864 // check for errors
865 if (is_static != fd.is_static()) {
866 ResourceMark rm(THREAD);
867 char msg[200];
868 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass()->external_name(), fd.name()->as_C_string());
869 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
870 }
871
872 // Final fields can only be accessed from its own class.
873 if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) {
874 THROW(vmSymbols::java_lang_IllegalAccessError());
875 }
876
877 // initialize resolved_klass if necessary
878 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
879 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
880 //
881 // note 2: we don't want to force initialization if we are just checking
882 // if the field access is legal; e.g., during compilation
883 if (is_static && initialize_class) {
884 sel_klass->initialize(CHECK);
885 }
886
887 if (sel_klass() != current_klass()) {
888 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
889 }
890
891 // return information. note that the klass is set to the actual klass containing the
892 // field, otherwise access of static fields in superclasses will not work.
893 }
894
895
896 //------------------------------------------------------------------------------------------------------------------------
897 // Invoke resolution
898 //
899 // Naming conventions:
900 //
901 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
902 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
903 // resolved_klass the specified klass (i.e., specified via constant pool index)
904 // recv_klass the receiver klass
905
906
907 void LinkResolver::resolve_static_call(CallInfo& result,
908 const LinkInfo& link_info,
909 bool initialize_class, TRAPS) {
910 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK);
911
912 // The resolved class can change as a result of this resolution.
913 KlassHandle resolved_klass = KlassHandle(THREAD, resolved_method->method_holder());
914
915 Method* save_resolved_method = resolved_method();
916 // Initialize klass (this should only happen if everything is ok)
917 if (initialize_class && resolved_klass->should_be_initialized()) {
918 resolved_klass->initialize(CHECK);
919 // Use updated LinkInfo (to reresolve with resolved_klass as method_holder?)
920 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
921 link_info.current_klass(), link_info.check_access());
922 resolved_method = linktime_resolve_static_method(new_info, CHECK);
923 }
924
925 assert(save_resolved_method == resolved_method(), "does this change?");
926 // setup result
927 result.set_static(resolved_klass, resolved_method, CHECK);
928 }
929
930 // throws linktime exceptions
931 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
932
933 KlassHandle resolved_klass = link_info.resolved_klass();
934 methodHandle resolved_method;
935 if (!resolved_klass->is_interface()) {
936 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
937 } else {
938 resolved_method = resolve_interface_method(link_info, /*nostatics*/false, CHECK_NULL);
939 }
940 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
941
942 // check if static
943 if (!resolved_method->is_static()) {
944 ResourceMark rm(THREAD);
945 char buf[200];
946 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
947 resolved_method->name(),
948 resolved_method->signature()));
949 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
950 }
951 return resolved_method;
952 }
953
954
955 void LinkResolver::resolve_special_call(CallInfo& result,
956 const LinkInfo& link_info,
957 TRAPS) {
958 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK);
959 runtime_resolve_special_method(result, resolved_method,
960 link_info.resolved_klass(),
961 link_info.current_klass(),
962 link_info.check_access(), CHECK);
963 }
964
965 // throws linktime exceptions
966 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info,
967 TRAPS) {
968
969 // Invokespecial is called for multiple special reasons:
970 // <init>
971 // local private method invocation, for classes and interfaces
972 // superclass.method, which can also resolve to a default method
973 // and the selected method is recalculated relative to the direct superclass
974 // superinterface.method, which explicitly does not check shadowing
975 KlassHandle resolved_klass = link_info.resolved_klass();
976 methodHandle resolved_method;
977
978 if (!resolved_klass->is_interface()) {
979 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
980 } else {
981 resolved_method = resolve_interface_method(link_info, /*nostatics*/true, CHECK_NULL);
982 }
983
984 // check if method name is <init>, that it is found in same klass as static type
985 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
986 resolved_method->method_holder() != resolved_klass()) {
987 ResourceMark rm(THREAD);
988 Exceptions::fthrow(
989 THREAD_AND_LOCATION,
990 vmSymbols::java_lang_NoSuchMethodError(),
991 "%s: method %s%s not found",
992 resolved_klass->external_name(),
993 resolved_method->name()->as_C_string(),
994 resolved_method->signature()->as_C_string()
995 );
996 return NULL;
997 }
998
999 // check if invokespecial's interface method reference is in an indirect superinterface
1000 KlassHandle current_klass = link_info.current_klass();
1001 if (!current_klass.is_null() && resolved_klass->is_interface()) {
1002 Klass *klass_to_check = !InstanceKlass::cast(current_klass())->is_anonymous() ?
1003 current_klass() :
1004 InstanceKlass::cast(current_klass())->host_klass();
1005 // Disable verification for the dynamically-generated reflection bytecodes.
1006 bool is_reflect = klass_to_check->is_subclass_of(
1007 SystemDictionary::reflect_MagicAccessorImpl_klass());
1008
1009 if (!is_reflect &&
1010 !InstanceKlass::cast(klass_to_check)->is_same_or_direct_interface(resolved_klass())) {
1011 ResourceMark rm(THREAD);
1012 char buf[200];
1013 jio_snprintf(buf, sizeof(buf),
1014 "Interface method reference: %s, is in an indirect superinterface of %s",
1015 Method::name_and_sig_as_C_string(resolved_klass(),
1016 resolved_method->name(),
1017 resolved_method->signature()),
1018 current_klass->external_name());
1019 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1020 }
1021 }
1022
1023 // check if not static
1024 if (resolved_method->is_static()) {
1025 ResourceMark rm(THREAD);
1026 char buf[200];
1027 jio_snprintf(buf, sizeof(buf),
1028 "Expecting non-static method %s",
1029 Method::name_and_sig_as_C_string(resolved_klass(),
1030 resolved_method->name(),
1031 resolved_method->signature()));
1032 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1033 }
1034
1035 if (TraceItables && Verbose) {
1036 trace_method_resolution("invokespecial resolved method: caller-class:",
1037 current_klass, resolved_klass, resolved_method);
1038 tty->cr();
1039 }
1040
1041 return resolved_method;
1042 }
1043
1044 // throws runtime exceptions
1045 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1046 const methodHandle& resolved_method,
1047 KlassHandle resolved_klass,
1048 KlassHandle current_klass,
1049 bool check_access, TRAPS) {
1050
1051 // resolved method is selected method unless we have an old-style lookup
1052 // for a superclass method
1053 // Invokespecial for a superinterface, resolved method is selected method,
1054 // no checks for shadowing
1055 methodHandle sel_method(THREAD, resolved_method());
1056
1057 // check if this is an old-style super call and do a new lookup if so
1058 { KlassHandle method_klass = KlassHandle(THREAD,
1059 resolved_method->method_holder());
1060
1061 if (check_access &&
1062 // a) check if ACC_SUPER flag is set for the current class
1063 (current_klass->is_super() || !AllowNonVirtualCalls) &&
1064 // b) check if the class of the resolved_klass is a superclass
1065 // (not supertype in order to exclude interface classes) of the current class.
1066 // This check is not performed for super.invoke for interface methods
1067 // in super interfaces.
1068 current_klass->is_subclass_of(resolved_klass()) &&
1069 current_klass() != resolved_klass() &&
1070 // c) check if the method is not <init>
1071 resolved_method->name() != vmSymbols::object_initializer_name()) {
1072 // Lookup super method
1073 KlassHandle super_klass(THREAD, current_klass->super());
1074 sel_method = lookup_instance_method_in_klasses(super_klass,
1075 resolved_method->name(),
1076 resolved_method->signature(), CHECK);
1077 // check if found
1078 if (sel_method.is_null()) {
1079 ResourceMark rm(THREAD);
1080 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1081 Method::name_and_sig_as_C_string(resolved_klass(),
1082 resolved_method->name(),
1083 resolved_method->signature()));
1084 }
1085 }
1086 }
1087
1088 // check if not static
1089 if (sel_method->is_static()) {
1090 ResourceMark rm(THREAD);
1091 char buf[200];
1092 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1093 resolved_method->name(),
1094 resolved_method->signature()));
1095 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1096 }
1097
1098 // check if abstract
1099 if (sel_method->is_abstract()) {
1100 ResourceMark rm(THREAD);
1101 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1102 Method::name_and_sig_as_C_string(resolved_klass(),
1103 sel_method->name(),
1104 sel_method->signature()));
1105 }
1106
1107 if (TraceItables && Verbose) {
1108 trace_method_resolution("invokespecial selected method: resolved-class:",
1109 resolved_klass, resolved_klass, sel_method);
1110 tty->cr();
1111 }
1112
1113 // setup result
1114 result.set_static(resolved_klass, sel_method, CHECK);
1115 }
1116
1117 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass,
1118 const LinkInfo& link_info,
1119 bool check_null_and_abstract, TRAPS) {
1120 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1121 runtime_resolve_virtual_method(result, resolved_method,
1122 link_info.resolved_klass(),
1123 recv, receiver_klass,
1124 check_null_and_abstract, CHECK);
1125 }
1126
1127 // throws linktime exceptions
1128 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1129 TRAPS) {
1130 // normal method resolution
1131 methodHandle resolved_method = resolve_method(link_info, /*require_methodref*/true, CHECK_NULL);
1132
1133 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1134 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1135
1136 // check if private interface method
1137 KlassHandle resolved_klass = link_info.resolved_klass();
1138 KlassHandle current_klass = link_info.current_klass();
1139
1140 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1141 ResourceMark rm(THREAD);
1142 char buf[200];
1143 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
1144 Method::name_and_sig_as_C_string(resolved_klass(),
1145 resolved_method->name(),
1146 resolved_method->signature()),
1147 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
1148 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1149 }
1150
1151 // check if not static
1152 if (resolved_method->is_static()) {
1153 ResourceMark rm(THREAD);
1154 char buf[200];
1155 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1156 resolved_method->name(),
1157 resolved_method->signature()));
1158 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1159 }
1160
1161 if (PrintVtables && Verbose) {
1162 trace_method_resolution("invokevirtual resolved method: caller-class:",
1163 current_klass, resolved_klass, resolved_method);
1164 tty->cr();
1165 }
1166
1167 return resolved_method;
1168 }
1169
1170 // throws runtime exceptions
1171 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1172 const methodHandle& resolved_method,
1173 KlassHandle resolved_klass,
1174 Handle recv,
1175 KlassHandle recv_klass,
1176 bool check_null_and_abstract,
1177 TRAPS) {
1178
1179 // setup default return values
1180 int vtable_index = Method::invalid_vtable_index;
1181 methodHandle selected_method;
1182
1183 assert(recv.is_null() || recv->is_oop(), "receiver is not an oop");
1184
1185 // runtime method resolution
1186 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1187 THROW(vmSymbols::java_lang_NullPointerException());
1188 }
1189
1190 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1191 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1192 // a missing receiver might result in a bogus lookup.
1193 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1194
1195 // do lookup based on receiver klass using the vtable index
1196 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1197 vtable_index = vtable_index_of_interface_method(resolved_klass,
1198 resolved_method);
1199 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1200
1201 InstanceKlass* inst = InstanceKlass::cast(recv_klass());
1202 selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
1203 } else {
1204 // at this point we are sure that resolved_method is virtual and not
1205 // a default or miranda method; therefore, it must have a valid vtable index.
1206 assert(!resolved_method->has_itable_index(), "");
1207 vtable_index = resolved_method->vtable_index();
1208 // We could get a negative vtable_index for final methods,
1209 // because as an optimization they are they are never put in the vtable,
1210 // unless they override an existing method.
1211 // If we do get a negative, it means the resolved method is the the selected
1212 // method, and it can never be changed by an override.
1213 if (vtable_index == Method::nonvirtual_vtable_index) {
1214 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1215 selected_method = resolved_method;
1216 } else {
1217 // recv_klass might be an arrayKlassOop but all vtables start at
1218 // the same place. The cast is to avoid virtual call and assertion.
1219 InstanceKlass* inst = (InstanceKlass*)recv_klass();
1220 selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
1221 }
1222 }
1223
1224 // check if method exists
1225 if (selected_method.is_null()) {
1226 ResourceMark rm(THREAD);
1227 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1228 Method::name_and_sig_as_C_string(resolved_klass(),
1229 resolved_method->name(),
1230 resolved_method->signature()));
1231 }
1232
1233 // check if abstract
1234 if (check_null_and_abstract && selected_method->is_abstract()) {
1235 ResourceMark rm(THREAD);
1236 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1237 Method::name_and_sig_as_C_string(resolved_klass(),
1238 selected_method->name(),
1239 selected_method->signature()));
1240 }
1241
1242 if (PrintVtables && Verbose) {
1243 trace_method_resolution("invokevirtual selected method: receiver-class:",
1244 recv_klass, resolved_klass, selected_method);
1245 tty->print_cr("vtable_index:%d", vtable_index);
1246 }
1247 // setup result
1248 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1249 }
1250
1251 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass,
1252 const LinkInfo& link_info,
1253 bool check_null_and_abstract, TRAPS) {
1254 // throws linktime exceptions
1255 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1256 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(),
1257 recv, recv_klass, check_null_and_abstract, CHECK);
1258 }
1259
1260 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1261 TRAPS) {
1262 // normal interface method resolution
1263 methodHandle resolved_method = resolve_interface_method(link_info, true, CHECK_NULL);
1264 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1265 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1266
1267 return resolved_method;
1268 }
1269
1270 // throws runtime exceptions
1271 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1272 const methodHandle& resolved_method,
1273 KlassHandle resolved_klass,
1274 Handle recv,
1275 KlassHandle recv_klass,
1276 bool check_null_and_abstract, TRAPS) {
1277 // check if receiver exists
1278 if (check_null_and_abstract && recv.is_null()) {
1279 THROW(vmSymbols::java_lang_NullPointerException());
1280 }
1281
1282 // check if private interface method
1283 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1284 ResourceMark rm(THREAD);
1285 char buf[200];
1286 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s",
1287 Method::name_and_sig_as_C_string(resolved_klass(),
1288 resolved_method->name(),
1289 resolved_method->signature()));
1290 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1291 }
1292
1293 // check if receiver klass implements the resolved interface
1294 if (!recv_klass->is_subtype_of(resolved_klass())) {
1295 ResourceMark rm(THREAD);
1296 char buf[200];
1297 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1298 recv_klass()->external_name(),
1299 resolved_klass()->external_name());
1300 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1301 }
1302
1303 // do lookup based on receiver klass
1304 // This search must match the linktime preparation search for itable initialization
1305 // to correctly enforce loader constraints for interface method inheritance
1306 methodHandle sel_method = lookup_instance_method_in_klasses(recv_klass,
1307 resolved_method->name(),
1308 resolved_method->signature(), CHECK);
1309 if (sel_method.is_null() && !check_null_and_abstract) {
1310 // In theory this is a harmless placeholder value, but
1311 // in practice leaving in null affects the nsk default method tests.
1312 // This needs further study.
1313 sel_method = resolved_method;
1314 }
1315 // check if method exists
1316 if (sel_method.is_null()) {
1317 ResourceMark rm(THREAD);
1318 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1319 Method::name_and_sig_as_C_string(recv_klass(),
1320 resolved_method->name(),
1321 resolved_method->signature()));
1322 }
1323 // check access
1324 // Throw Illegal Access Error if sel_method is not public.
1325 if (!sel_method->is_public()) {
1326 ResourceMark rm(THREAD);
1327 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
1328 Method::name_and_sig_as_C_string(recv_klass(),
1329 sel_method->name(),
1330 sel_method->signature()));
1331 }
1332 // check if abstract
1333 if (check_null_and_abstract && sel_method->is_abstract()) {
1334 ResourceMark rm(THREAD);
1335 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1336 Method::name_and_sig_as_C_string(recv_klass(),
1337 sel_method->name(),
1338 sel_method->signature()));
1339 }
1340
1341 if (TraceItables && Verbose) {
1342 trace_method_resolution("invokeinterface selected method: receiver-class",
1343 recv_klass, resolved_klass, sel_method);
1344 tty->cr();
1345 }
1346 // setup result
1347 if (!resolved_method->has_itable_index()) {
1348 int vtable_index = resolved_method->vtable_index();
1349 assert(vtable_index == sel_method->vtable_index(), "sanity check");
1350 result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK);
1351 } else {
1352 int itable_index = resolved_method()->itable_index();
1353 result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK);
1354 }
1355 }
1356
1357
1358 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1359 const LinkInfo& link_info) {
1360 EXCEPTION_MARK;
1361 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD);
1362 if (HAS_PENDING_EXCEPTION) {
1363 CLEAR_PENDING_EXCEPTION;
1364 return methodHandle();
1365 } else {
1366 return method_result;
1367 }
1368 }
1369
1370 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
1371 const LinkInfo& link_info) {
1372 EXCEPTION_MARK;
1373 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD);
1374 if (HAS_PENDING_EXCEPTION) {
1375 CLEAR_PENDING_EXCEPTION;
1376 return methodHandle();
1377 } else {
1378 return method_result;
1379 }
1380 }
1381
1382 methodHandle LinkResolver::resolve_virtual_call_or_null(
1383 KlassHandle receiver_klass,
1384 const LinkInfo& link_info) {
1385 EXCEPTION_MARK;
1386 CallInfo info;
1387 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1388 if (HAS_PENDING_EXCEPTION) {
1389 CLEAR_PENDING_EXCEPTION;
1390 return methodHandle();
1391 }
1392 return info.selected_method();
1393 }
1394
1395 methodHandle LinkResolver::resolve_interface_call_or_null(
1396 KlassHandle receiver_klass,
1397 const LinkInfo& link_info) {
1398 EXCEPTION_MARK;
1399 CallInfo info;
1400 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1401 if (HAS_PENDING_EXCEPTION) {
1402 CLEAR_PENDING_EXCEPTION;
1403 return methodHandle();
1404 }
1405 return info.selected_method();
1406 }
1407
1408 int LinkResolver::resolve_virtual_vtable_index(KlassHandle receiver_klass,
1409 const LinkInfo& link_info) {
1410 EXCEPTION_MARK;
1411 CallInfo info;
1412 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1413 /*check_null_or_abstract*/false, THREAD);
1414 if (HAS_PENDING_EXCEPTION) {
1415 CLEAR_PENDING_EXCEPTION;
1416 return Method::invalid_vtable_index;
1417 }
1418 return info.vtable_index();
1419 }
1420
1421 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1422 EXCEPTION_MARK;
1423 CallInfo info;
1424 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1425 if (HAS_PENDING_EXCEPTION) {
1426 CLEAR_PENDING_EXCEPTION;
1427 return methodHandle();
1428 }
1429 return info.selected_method();
1430 }
1431
1432 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1433 EXCEPTION_MARK;
1434 CallInfo info;
1435 resolve_special_call(info, link_info, THREAD);
1436 if (HAS_PENDING_EXCEPTION) {
1437 CLEAR_PENDING_EXCEPTION;
1438 return methodHandle();
1439 }
1440 return info.selected_method();
1441 }
1442
1443
1444
1445 //------------------------------------------------------------------------------------------------------------------------
1446 // ConstantPool entries
1447
1448 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) {
1449 switch (byte) {
1450 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1451 case Bytecodes::_invokespecial : resolve_invokespecial (result, pool, index, CHECK); break;
1452 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1453 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1454 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1455 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1456 }
1457 return;
1458 }
1459
1460 void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1461 LinkInfo link_info(pool, index, CHECK);
1462 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1463 }
1464
1465
1466 void LinkResolver::resolve_invokespecial(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1467 LinkInfo link_info(pool, index, CHECK);
1468 resolve_special_call(result, link_info, CHECK);
1469 }
1470
1471
1472 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1473 const constantPoolHandle& pool, int index,
1474 TRAPS) {
1475
1476 LinkInfo link_info(pool, index, CHECK);
1477 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1478 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1479 }
1480
1481
1482 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) {
1483 LinkInfo link_info(pool, index, CHECK);
1484 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1485 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1486 }
1487
1488
1489 void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1490 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1491 LinkInfo link_info(pool, index, CHECK);
1492 if (TraceMethodHandles) {
1493 ResourceMark rm(THREAD);
1494 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1495 link_info.signature()->as_C_string());
1496 }
1497 resolve_handle_call(result, link_info, CHECK);
1498 }
1499
1500 void LinkResolver::resolve_handle_call(CallInfo& result,
1501 const LinkInfo& link_info,
1502 TRAPS) {
1503 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1504 assert(link_info.resolved_klass()() == SystemDictionary::MethodHandle_klass(), "");
1505 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1506 Handle resolved_appendix;
1507 Handle resolved_method_type;
1508 methodHandle resolved_method = lookup_polymorphic_method(link_info,
1509 &resolved_appendix, &resolved_method_type, CHECK);
1510 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, CHECK);
1511 }
1512
1513 static void wrap_invokedynamic_exception(TRAPS) {
1514 if (HAS_PENDING_EXCEPTION) {
1515 if (TraceMethodHandles) {
1516 tty->print_cr("invokedynamic throws BSME for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION));
1517 PENDING_EXCEPTION->print();
1518 }
1519 if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) {
1520 // throw these guys, since they are already wrapped
1521 return;
1522 }
1523 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1524 // intercept only LinkageErrors which might have failed to wrap
1525 return;
1526 }
1527 // See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS.
1528 Handle nested_exception(THREAD, PENDING_EXCEPTION);
1529 CLEAR_PENDING_EXCEPTION;
1530 THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception)
1531 }
1532 }
1533
1534 void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) {
1535 Symbol* method_name = pool->name_ref_at(index);
1536 Symbol* method_signature = pool->signature_ref_at(index);
1537 KlassHandle current_klass = KlassHandle(THREAD, pool->pool_holder());
1538
1539 // Resolve the bootstrap specifier (BSM + optional arguments).
1540 Handle bootstrap_specifier;
1541 // Check if CallSite has been bound already:
1542 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1543 if (cpce->is_f1_null()) {
1544 int pool_index = cpce->constant_pool_index();
1545 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD);
1546 wrap_invokedynamic_exception(CHECK);
1547 assert(bsm_info != NULL, "");
1548 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
1549 bootstrap_specifier = Handle(THREAD, bsm_info);
1550 }
1551 if (!cpce->is_f1_null()) {
1552 methodHandle method( THREAD, cpce->f1_as_method());
1553 Handle appendix( THREAD, cpce->appendix_if_resolved(pool));
1554 Handle method_type(THREAD, cpce->method_type_if_resolved(pool));
1555 result.set_handle(method, appendix, method_type, THREAD);
1556 wrap_invokedynamic_exception(CHECK);
1557 return;
1558 }
1559
1560 if (TraceMethodHandles) {
1561 ResourceMark rm(THREAD);
1562 tty->print_cr("resolve_invokedynamic #%d %s %s",
1563 ConstantPool::decode_invokedynamic_index(index),
1564 method_name->as_C_string(), method_signature->as_C_string());
1565 tty->print(" BSM info: "); bootstrap_specifier->print();
1566 }
1567
1568 resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK);
1569 }
1570
1571 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1572 Handle bootstrap_specifier,
1573 Symbol* method_name, Symbol* method_signature,
1574 KlassHandle current_klass,
1575 TRAPS) {
1576 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...)
1577 // The appendix argument is likely to be a freshly-created CallSite.
1578 Handle resolved_appendix;
1579 Handle resolved_method_type;
1580 methodHandle resolved_method =
1581 SystemDictionary::find_dynamic_call_site_invoker(current_klass,
1582 bootstrap_specifier,
1583 method_name, method_signature,
1584 &resolved_appendix,
1585 &resolved_method_type,
1586 THREAD);
1587 wrap_invokedynamic_exception(CHECK);
1588 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD);
1589 wrap_invokedynamic_exception(CHECK);
1590 }
1591
1592 #ifndef PRODUCT
1593 void LinkResolver::trace_method_resolution(const char* prefix,
1594 KlassHandle klass,
1595 KlassHandle resolved_klass,
1596 const methodHandle& method) {
1597 ResourceMark rm;
1598 tty->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
1599 prefix,
1600 (klass.is_null() ? "<NULL>" : klass->internal_name()),
1601 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
1602 Method::name_and_sig_as_C_string(resolved_klass(),
1603 method->name(),
1604 method->signature()),
1605 method->method_holder()->internal_name()
1606 );
1607 method->access_flags().print_on(tty);
1608 if (method->is_default_method()) {
1609 tty->print("default ");
1610 }
1611 if (method->is_overpass()) {
1612 tty->print("overpass ");
1613 }
1614 }
1615 #endif // PRODUCT