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