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,
383 Klass::find_static, Klass::find_private);
384 if (index >= 0 ) {
385 vtable_index = InstanceKlass::cast(klass())->default_vtable_indices()->at(index);
386 }
387 }
388 if (vtable_index == Method::invalid_vtable_index) {
389 // get vtable_index for miranda methods
390 ResourceMark rm;
391 klassVtable *vt = InstanceKlass::cast(klass())->vtable();
392 vtable_index = vt->index_of_miranda(name, signature);
393 }
394 return vtable_index;
395 }
396
397 methodHandle LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info, TRAPS) {
398 InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()());
399
400 // Specify 'true' in order to skip default methods when searching the
401 // interfaces. Function lookup_method_in_klasses() already looked for
402 // the method in the default methods table.
403 return methodHandle(THREAD,
404 ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(),
405 Klass::skip_defaults));
406 }
407
408 methodHandle LinkResolver::lookup_polymorphic_method(
409 const LinkInfo& link_info,
410 Handle *appendix_result_or_null,
411 Handle *method_type_result,
412 TRAPS) {
413 KlassHandle klass = link_info.resolved_klass();
414 Symbol* name = link_info.name();
415 Symbol* full_signature = link_info.signature();
416
417 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
418 if (TraceMethodHandles) {
419 ResourceMark rm(THREAD);
420 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
421 vmIntrinsics::name_at(iid), klass->external_name(),
422 name->as_C_string(), full_signature->as_C_string());
423 }
424 if (klass() == SystemDictionary::MethodHandle_klass() &&
425 iid != vmIntrinsics::_none) {
426 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
427 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
428 // Do not erase last argument type (MemberName) if it is a static linkTo method.
429 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
430 TempNewSymbol basic_signature =
431 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL);
432 if (TraceMethodHandles) {
433 ResourceMark rm(THREAD);
434 tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
435 name->as_C_string(),
436 full_signature->as_C_string(),
437 basic_signature->as_C_string());
438 }
439 methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid,
440 basic_signature,
441 CHECK_NULL);
442 if (result.not_null()) {
443 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
444 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
445 assert(basic_signature == result->signature(), "predict the result signature");
446 if (TraceMethodHandles) {
447 tty->print("lookup_polymorphic_method => intrinsic ");
448 result->print_on(tty);
449 }
450 }
451 return result;
452 } else if (iid == vmIntrinsics::_invokeGeneric
453 && !THREAD->is_Compiler_thread()
454 && appendix_result_or_null != NULL) {
455 // This is a method with type-checking semantics.
456 // We will ask Java code to spin an adapter method for it.
457 if (!MethodHandles::enabled()) {
458 // Make sure the Java part of the runtime has been booted up.
459 Klass* natives = SystemDictionary::MethodHandleNatives_klass();
460 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
461 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
462 Handle(),
463 Handle(),
464 true,
465 CHECK_NULL);
466 }
467 }
468
469 Handle appendix;
470 Handle method_type;
471 methodHandle result = SystemDictionary::find_method_handle_invoker(
472 name,
473 full_signature,
474 link_info.current_klass(),
475 &appendix,
476 &method_type,
477 CHECK_NULL);
478 if (TraceMethodHandles) {
479 tty->print("lookup_polymorphic_method => (via Java) ");
480 result->print_on(tty);
481 tty->print(" lookup_polymorphic_method => appendix = ");
482 if (appendix.is_null()) tty->print_cr("(none)");
483 else appendix->print_on(tty);
484 }
485 if (result.not_null()) {
486 #ifdef ASSERT
487 ResourceMark rm(THREAD);
488
489 TempNewSymbol basic_signature =
490 MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL);
491 int actual_size_of_params = result->size_of_parameters();
492 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
493 // +1 for MethodHandle.this, +1 for trailing MethodType
494 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
495 if (appendix.not_null()) expected_size_of_params += 1;
496 if (actual_size_of_params != expected_size_of_params) {
497 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
498 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
499 result->print();
500 }
501 assert(actual_size_of_params == expected_size_of_params,
502 err_msg("%d != %d", actual_size_of_params, expected_size_of_params));
503 #endif //ASSERT
504
505 assert(appendix_result_or_null != NULL, "");
506 (*appendix_result_or_null) = appendix;
507 (*method_type_result) = method_type;
508 }
509 return result;
510 }
511 }
512 return NULL;
513 }
514
515 void LinkResolver::check_method_accessability(KlassHandle ref_klass,
516 KlassHandle resolved_klass,
517 KlassHandle sel_klass,
518 const methodHandle& sel_method,
519 TRAPS) {
520
521 AccessFlags flags = sel_method->access_flags();
522
523 // Special case: arrays always override "clone". JVMS 2.15.
524 // If the resolved klass is an array class, and the declaring class
525 // is java.lang.Object and the method is "clone", set the flags
526 // to public.
527 //
528 // We'll check for the method name first, as that's most likely
529 // to be false (so we'll short-circuit out of these tests).
530 if (sel_method->name() == vmSymbols::clone_name() &&
531 sel_klass() == SystemDictionary::Object_klass() &&
532 resolved_klass->oop_is_array()) {
533 // We need to change "protected" to "public".
534 assert(flags.is_protected(), "clone not protected?");
535 jint new_flags = flags.as_int();
536 new_flags = new_flags & (~JVM_ACC_PROTECTED);
537 new_flags = new_flags | JVM_ACC_PUBLIC;
538 flags.set_flags(new_flags);
539 }
540 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
541
542 if (!Reflection::verify_field_access(ref_klass(),
543 resolved_klass(),
544 sel_klass(),
545 flags,
546 true)) {
547 ResourceMark rm(THREAD);
548 Exceptions::fthrow(
549 THREAD_AND_LOCATION,
550 vmSymbols::java_lang_IllegalAccessError(),
551 "tried to access method %s.%s%s from class %s",
552 sel_klass->external_name(),
553 sel_method->name()->as_C_string(),
554 sel_method->signature()->as_C_string(),
555 ref_klass->external_name()
556 );
557 return;
558 }
559 }
560
561 methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code,
562 constantPoolHandle pool, int index, TRAPS) {
563 // This method is used only
564 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
565 // and
566 // (2) in Bytecode_invoke::static_target
567 // It appears to fail when applied to an invokeinterface call site.
568 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
569 // resolve klass
570 KlassHandle resolved_klass;
571 if (code == Bytecodes::_invokedynamic) {
572 resolved_klass = SystemDictionary::MethodHandle_klass();
573 Symbol* method_name = vmSymbols::invoke_name();
574 Symbol* method_signature = pool->signature_ref_at(index);
575 KlassHandle current_klass(THREAD, pool->pool_holder());
576 LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass);
577 return resolve_method(link_info, /*require_methodref*/false, THREAD);
578 }
579
580 LinkInfo link_info(pool, index, CHECK_NULL);
581 resolved_klass = link_info.resolved_klass();
582
583 if (pool->has_preresolution()
584 || (resolved_klass() == SystemDictionary::MethodHandle_klass() &&
585 MethodHandles::is_signature_polymorphic_name(resolved_klass(), link_info.name()))) {
586 Method* result = ConstantPool::method_at_if_loaded(pool, index);
587 if (result != NULL) {
588 return methodHandle(THREAD, result);
589 }
590 }
591
592 if (code == Bytecodes::_invokeinterface) {
593 return resolve_interface_method(link_info, true, THREAD);
594 } else if (code == Bytecodes::_invokevirtual) {
595 return resolve_method(link_info, /*require_methodref*/true, THREAD);
596 } else if (!resolved_klass->is_interface()) {
597 return resolve_method(link_info, /*require_methodref*/false, THREAD);
598 } else {
599 bool nostatics = (code == Bytecodes::_invokestatic) ? false : true;
600 return resolve_interface_method(link_info, nostatics, THREAD);
601 }
602 }
603
604 // Check and print a loader constraint violation message for method or interface method
605 void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info,
606 const methodHandle& resolved_method,
607 const char* method_type, TRAPS) {
608 Handle current_loader(THREAD, link_info.current_klass()->class_loader());
609 Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader());
610
611 ResourceMark rm(THREAD);
612 Symbol* failed_type_symbol =
613 SystemDictionary::check_signature_loaders(link_info.signature(), current_loader,
614 resolved_loader, true, CHECK);
615 if (failed_type_symbol != NULL) {
616 const char* msg = "loader constraint violation: when resolving %s"
617 " \"%s\" the class loader (instance of %s) of the current class, %s,"
618 " and the class loader (instance of %s) for the method's defining class, %s, have"
619 " different Class objects for the type %s used in the signature";
620 char* sig = link_info.method_string();
621 const char* loader1_name = SystemDictionary::loader_name(current_loader());
622 char* current = link_info.current_klass()->name()->as_C_string();
623 const char* loader2_name = SystemDictionary::loader_name(resolved_loader());
624 char* target = resolved_method->method_holder()->name()->as_C_string();
625 char* failed_type_name = failed_type_symbol->as_C_string();
626 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) +
627 strlen(current) + strlen(loader2_name) + strlen(target) +
628 strlen(failed_type_name) + strlen(method_type) + 1;
629 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
630 jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name,
631 target, failed_type_name);
632 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
633 }
634 }
635
636 void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig,
637 KlassHandle current_klass,
638 KlassHandle sel_klass, TRAPS) {
639 Handle ref_loader(THREAD, current_klass->class_loader());
640 Handle sel_loader(THREAD, sel_klass->class_loader());
641
642 ResourceMark rm(THREAD); // needed for check_signature_loaders
643 Symbol* failed_type_symbol =
644 SystemDictionary::check_signature_loaders(sig,
645 ref_loader, sel_loader,
646 false,
647 CHECK);
648 if (failed_type_symbol != NULL) {
649 const char* msg = "loader constraint violation: when resolving field"
650 " \"%s\" the class loader (instance of %s) of the referring class, "
651 "%s, and the class loader (instance of %s) for the field's resolved "
652 "type, %s, have different Class objects for that type";
653 char* field_name = field->as_C_string();
654 const char* loader1_name = SystemDictionary::loader_name(ref_loader());
655 char* sel = sel_klass->name()->as_C_string();
656 const char* loader2_name = SystemDictionary::loader_name(sel_loader());
657 char* failed_type_name = failed_type_symbol->as_C_string();
658 size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1_name) +
659 strlen(sel) + strlen(loader2_name) + strlen(failed_type_name) + 1;
660 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
661 jio_snprintf(buf, buflen, msg, field_name, loader1_name, sel, loader2_name,
662 failed_type_name);
663 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
664 }
665 }
666
667 methodHandle LinkResolver::resolve_method(const LinkInfo& link_info,
668 bool require_methodref, TRAPS) {
669
670 Handle nested_exception;
671 KlassHandle resolved_klass = link_info.resolved_klass();
672
673 // 1. check if methodref required, that resolved_klass is not interfacemethodref
674 if (require_methodref && resolved_klass->is_interface()) {
675 ResourceMark rm(THREAD);
676 char buf[200];
677 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
678 resolved_klass()->external_name());
679 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
680 }
681
682 // 2. lookup method in resolved klass and its super klasses
683 methodHandle resolved_method = lookup_method_in_klasses(link_info, true, false, CHECK_NULL);
684
685 if (resolved_method.is_null() && !resolved_klass->oop_is_array()) { // not found in the class hierarchy
686 // 3. lookup method in all the interfaces implemented by the resolved klass
687 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
688
689 if (resolved_method.is_null()) {
690 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
691 resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD);
692 if (HAS_PENDING_EXCEPTION) {
693 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
694 CLEAR_PENDING_EXCEPTION;
695 }
696 }
697 }
698
699 if (resolved_method.is_null()) {
700 // 4. method lookup failed
701 ResourceMark rm(THREAD);
702 THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(),
703 Method::name_and_sig_as_C_string(resolved_klass(),
704 link_info.name(),
705 link_info.signature()),
706 nested_exception, NULL);
707 }
708
709 // 5. access checks, access checking may be turned off when calling from within the VM.
710 KlassHandle current_klass = link_info.current_klass();
711 if (link_info.check_access()) {
712 assert(current_klass.not_null() , "current_klass should not be null");
713
714 // check if method can be accessed by the referring class
715 check_method_accessability(current_klass,
716 resolved_klass,
717 KlassHandle(THREAD, resolved_method->method_holder()),
718 resolved_method,
719 CHECK_NULL);
720
721 // check loader constraints
722 check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL);
723 }
724
725 return resolved_method;
726 }
727
728 methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info,
729 bool nostatics, TRAPS) {
730
731 KlassHandle resolved_klass = link_info.resolved_klass();
732
733 // check if klass is interface
734 if (!resolved_klass->is_interface()) {
735 ResourceMark rm(THREAD);
736 char buf[200];
737 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass()->external_name());
738 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
739 }
740
741 // lookup method in this interface or its super, java.lang.Object
742 // JDK8: also look for static methods
743 methodHandle resolved_method = lookup_method_in_klasses(link_info, false, true, CHECK_NULL);
744
745 if (resolved_method.is_null() && !resolved_klass->oop_is_array()) {
746 // lookup method in all the super-interfaces
747 resolved_method = lookup_method_in_interfaces(link_info, CHECK_NULL);
748 }
749
750 if (resolved_method.is_null()) {
751 // no method found
752 ResourceMark rm(THREAD);
753 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(),
754 Method::name_and_sig_as_C_string(resolved_klass(),
755 link_info.name(),
756 link_info.signature()));
757 }
758
759 if (link_info.check_access()) {
760 // JDK8 adds non-public interface methods, and accessability check requirement
761 KlassHandle current_klass = link_info.current_klass();
762
763 assert(current_klass.not_null() , "current_klass should not be null");
764
765 // check if method can be accessed by the referring class
766 check_method_accessability(current_klass,
767 resolved_klass,
768 KlassHandle(THREAD, resolved_method->method_holder()),
769 resolved_method,
770 CHECK_NULL);
771
772 check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL);
773 }
774
775 if (nostatics && resolved_method->is_static()) {
776 ResourceMark rm(THREAD);
777 char buf[200];
778 jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s",
779 Method::name_and_sig_as_C_string(resolved_klass(),
780 resolved_method->name(), resolved_method->signature()));
781 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
782 }
783
784 if (TraceItables && Verbose) {
785 trace_method_resolution("invokeinterface resolved method: caller-class",
786 link_info.current_klass(), resolved_klass, resolved_method);
787 tty->cr();
788 }
789
790 return resolved_method;
791 }
792
793 //------------------------------------------------------------------------------------------------------------------------
794 // Field resolution
795
796 void LinkResolver::check_field_accessability(KlassHandle ref_klass,
797 KlassHandle resolved_klass,
798 KlassHandle sel_klass,
799 const fieldDescriptor& fd,
800 TRAPS) {
801 if (!Reflection::verify_field_access(ref_klass(),
802 resolved_klass(),
803 sel_klass(),
804 fd.access_flags(),
805 true)) {
806 ResourceMark rm(THREAD);
807 Exceptions::fthrow(
808 THREAD_AND_LOCATION,
809 vmSymbols::java_lang_IllegalAccessError(),
810 "tried to access field %s.%s from class %s",
811 sel_klass->external_name(),
812 fd.name()->as_C_string(),
813 ref_klass->external_name()
814 );
815 return;
816 }
817 }
818
819 void LinkResolver::resolve_field_access(fieldDescriptor& fd, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS) {
820 LinkInfo link_info(pool, index, CHECK);
821 resolve_field(fd, link_info, byte, true, CHECK);
822 }
823
824 void LinkResolver::resolve_field(fieldDescriptor& fd,
825 const LinkInfo& link_info,
826 Bytecodes::Code byte, bool initialize_class,
827 TRAPS) {
828 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
829 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
830 byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield ||
831 (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode");
832
833 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
834 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield);
835 // Check if there's a resolved klass containing the field
836 KlassHandle resolved_klass = link_info.resolved_klass();
837 Symbol* field = link_info.name();
838 Symbol* sig = link_info.signature();
839
840 if (resolved_klass.is_null()) {
841 ResourceMark rm(THREAD);
842 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
843 }
844
845 // Resolve instance field
846 KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd));
847 // check if field exists; i.e., if a klass containing the field def has been selected
848 if (sel_klass.is_null()) {
849 ResourceMark rm(THREAD);
850 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
851 }
852
853 if (!link_info.check_access())
854 // Access checking may be turned off when calling from within the VM.
855 return;
856
857 // check access
858 KlassHandle current_klass = link_info.current_klass();
859 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
860
861 // check for errors
862 if (is_static != fd.is_static()) {
863 ResourceMark rm(THREAD);
864 char msg[200];
865 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass()->external_name(), fd.name()->as_C_string());
866 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
867 }
868
869 // Final fields can only be accessed from its own class.
870 if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) {
871 THROW(vmSymbols::java_lang_IllegalAccessError());
872 }
873
874 // initialize resolved_klass if necessary
875 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
876 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
877 //
878 // note 2: we don't want to force initialization if we are just checking
879 // if the field access is legal; e.g., during compilation
880 if (is_static && initialize_class) {
881 sel_klass->initialize(CHECK);
882 }
883
884 if (sel_klass() != current_klass()) {
885 check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK);
886 }
887
888 // return information. note that the klass is set to the actual klass containing the
889 // field, otherwise access of static fields in superclasses will not work.
890 }
891
892
893 //------------------------------------------------------------------------------------------------------------------------
894 // Invoke resolution
895 //
896 // Naming conventions:
897 //
898 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
899 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
900 // resolved_klass the specified klass (i.e., specified via constant pool index)
901 // recv_klass the receiver klass
902
903
904 void LinkResolver::resolve_static_call(CallInfo& result,
905 const LinkInfo& link_info,
906 bool initialize_class, TRAPS) {
907 methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK);
908
909 // The resolved class can change as a result of this resolution.
910 KlassHandle resolved_klass = KlassHandle(THREAD, resolved_method->method_holder());
911
912 Method* save_resolved_method = resolved_method();
913 // Initialize klass (this should only happen if everything is ok)
914 if (initialize_class && resolved_klass->should_be_initialized()) {
915 resolved_klass->initialize(CHECK);
916 // Use updated LinkInfo (to reresolve with resolved_klass as method_holder?)
917 LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(),
918 link_info.current_klass(), link_info.check_access());
919 resolved_method = linktime_resolve_static_method(new_info, CHECK);
920 }
921
922 assert(save_resolved_method == resolved_method(), "does this change?");
923 // setup result
924 result.set_static(resolved_klass, resolved_method, CHECK);
925 }
926
927 // throws linktime exceptions
928 methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) {
929
930 KlassHandle resolved_klass = link_info.resolved_klass();
931 methodHandle resolved_method;
932 if (!resolved_klass->is_interface()) {
933 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
934 } else {
935 resolved_method = resolve_interface_method(link_info, /*nostatics*/false, CHECK_NULL);
936 }
937 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
938
939 // check if static
940 if (!resolved_method->is_static()) {
941 ResourceMark rm(THREAD);
942 char buf[200];
943 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
944 resolved_method->name(),
945 resolved_method->signature()));
946 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
947 }
948 return resolved_method;
949 }
950
951
952 void LinkResolver::resolve_special_call(CallInfo& result,
953 const LinkInfo& link_info,
954 TRAPS) {
955 methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK);
956 runtime_resolve_special_method(result, resolved_method,
957 link_info.resolved_klass(),
958 link_info.current_klass(),
959 link_info.check_access(), CHECK);
960 }
961
962 // throws linktime exceptions
963 methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info,
964 TRAPS) {
965
966 // Invokespecial is called for multiple special reasons:
967 // <init>
968 // local private method invocation, for classes and interfaces
969 // superclass.method, which can also resolve to a default method
970 // and the selected method is recalculated relative to the direct superclass
971 // superinterface.method, which explicitly does not check shadowing
972 KlassHandle resolved_klass = link_info.resolved_klass();
973 methodHandle resolved_method;
974
975 if (!resolved_klass->is_interface()) {
976 resolved_method = resolve_method(link_info, /*require_methodref*/false, CHECK_NULL);
977 } else {
978 resolved_method = resolve_interface_method(link_info, /*nostatics*/true, CHECK_NULL);
979 }
980
981 // check if method name is <init>, that it is found in same klass as static type
982 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
983 resolved_method->method_holder() != resolved_klass()) {
984 ResourceMark rm(THREAD);
985 Exceptions::fthrow(
986 THREAD_AND_LOCATION,
987 vmSymbols::java_lang_NoSuchMethodError(),
988 "%s: method %s%s not found",
989 resolved_klass->external_name(),
990 resolved_method->name()->as_C_string(),
991 resolved_method->signature()->as_C_string()
992 );
993 return NULL;
994 }
995
996 // check if invokespecial's interface method reference is in an indirect superinterface
997 KlassHandle current_klass = link_info.current_klass();
998 if (!current_klass.is_null() && resolved_klass->is_interface()) {
999 Klass *klass_to_check = !InstanceKlass::cast(current_klass())->is_anonymous() ?
1000 current_klass() :
1001 InstanceKlass::cast(current_klass())->host_klass();
1002 // Disable verification for the dynamically-generated reflection bytecodes.
1003 bool is_reflect = klass_to_check->is_subclass_of(
1004 SystemDictionary::reflect_MagicAccessorImpl_klass());
1005
1006 if (!is_reflect &&
1007 !InstanceKlass::cast(klass_to_check)->is_same_or_direct_interface(resolved_klass())) {
1008 ResourceMark rm(THREAD);
1009 char buf[200];
1010 jio_snprintf(buf, sizeof(buf),
1011 "Interface method reference: %s, is in an indirect superinterface of %s",
1012 Method::name_and_sig_as_C_string(resolved_klass(),
1013 resolved_method->name(),
1014 resolved_method->signature()),
1015 current_klass->external_name());
1016 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1017 }
1018 }
1019
1020 // check if not static
1021 if (resolved_method->is_static()) {
1022 ResourceMark rm(THREAD);
1023 char buf[200];
1024 jio_snprintf(buf, sizeof(buf),
1025 "Expecting non-static method %s",
1026 Method::name_and_sig_as_C_string(resolved_klass(),
1027 resolved_method->name(),
1028 resolved_method->signature()));
1029 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1030 }
1031
1032 if (TraceItables && Verbose) {
1033 trace_method_resolution("invokespecial resolved method: caller-class:",
1034 current_klass, resolved_klass, resolved_method);
1035 tty->cr();
1036 }
1037
1038 return resolved_method;
1039 }
1040
1041 // throws runtime exceptions
1042 void LinkResolver::runtime_resolve_special_method(CallInfo& result,
1043 const methodHandle& resolved_method,
1044 KlassHandle resolved_klass,
1045 KlassHandle current_klass,
1046 bool check_access, TRAPS) {
1047
1048 // resolved method is selected method unless we have an old-style lookup
1049 // for a superclass method
1050 // Invokespecial for a superinterface, resolved method is selected method,
1051 // no checks for shadowing
1052 methodHandle sel_method(THREAD, resolved_method());
1053
1054 // check if this is an old-style super call and do a new lookup if so
1055 { KlassHandle method_klass = KlassHandle(THREAD,
1056 resolved_method->method_holder());
1057
1058 if (check_access &&
1059 // a) check if ACC_SUPER flag is set for the current class
1060 (current_klass->is_super() || !AllowNonVirtualCalls) &&
1061 // b) check if the class of the resolved_klass is a superclass
1062 // (not supertype in order to exclude interface classes) of the current class.
1063 // This check is not performed for super.invoke for interface methods
1064 // in super interfaces.
1065 current_klass->is_subclass_of(resolved_klass()) &&
1066 current_klass() != resolved_klass() &&
1067 // c) check if the method is not <init>
1068 resolved_method->name() != vmSymbols::object_initializer_name()) {
1069 // Lookup super method
1070 KlassHandle super_klass(THREAD, current_klass->super());
1071 sel_method = lookup_instance_method_in_klasses(super_klass,
1072 resolved_method->name(),
1073 resolved_method->signature(), CHECK);
1074 // check if found
1075 if (sel_method.is_null()) {
1076 ResourceMark rm(THREAD);
1077 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1078 Method::name_and_sig_as_C_string(resolved_klass(),
1079 resolved_method->name(),
1080 resolved_method->signature()));
1081 }
1082 }
1083 }
1084
1085 // check if not static
1086 if (sel_method->is_static()) {
1087 ResourceMark rm(THREAD);
1088 char buf[200];
1089 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1090 resolved_method->name(),
1091 resolved_method->signature()));
1092 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1093 }
1094
1095 // check if abstract
1096 if (sel_method->is_abstract()) {
1097 ResourceMark rm(THREAD);
1098 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1099 Method::name_and_sig_as_C_string(resolved_klass(),
1100 sel_method->name(),
1101 sel_method->signature()));
1102 }
1103
1104 if (TraceItables && Verbose) {
1105 trace_method_resolution("invokespecial selected method: resolved-class:",
1106 resolved_klass, resolved_klass, sel_method);
1107 tty->cr();
1108 }
1109
1110 // setup result
1111 result.set_static(resolved_klass, sel_method, CHECK);
1112 }
1113
1114 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass,
1115 const LinkInfo& link_info,
1116 bool check_null_and_abstract, TRAPS) {
1117 methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK);
1118 runtime_resolve_virtual_method(result, resolved_method,
1119 link_info.resolved_klass(),
1120 recv, receiver_klass,
1121 check_null_and_abstract, CHECK);
1122 }
1123
1124 // throws linktime exceptions
1125 methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info,
1126 TRAPS) {
1127 // normal method resolution
1128 methodHandle resolved_method = resolve_method(link_info, /*require_methodref*/true, CHECK_NULL);
1129
1130 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1131 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1132
1133 // check if private interface method
1134 KlassHandle resolved_klass = link_info.resolved_klass();
1135 KlassHandle current_klass = link_info.current_klass();
1136
1137 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1138 ResourceMark rm(THREAD);
1139 char buf[200];
1140 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
1141 Method::name_and_sig_as_C_string(resolved_klass(),
1142 resolved_method->name(),
1143 resolved_method->signature()),
1144 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
1145 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1146 }
1147
1148 // check if not static
1149 if (resolved_method->is_static()) {
1150 ResourceMark rm(THREAD);
1151 char buf[200];
1152 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1153 resolved_method->name(),
1154 resolved_method->signature()));
1155 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1156 }
1157
1158 if (PrintVtables && Verbose) {
1159 trace_method_resolution("invokevirtual resolved method: caller-class:",
1160 current_klass, resolved_klass, resolved_method);
1161 tty->cr();
1162 }
1163
1164 return resolved_method;
1165 }
1166
1167 // throws runtime exceptions
1168 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1169 const methodHandle& resolved_method,
1170 KlassHandle resolved_klass,
1171 Handle recv,
1172 KlassHandle recv_klass,
1173 bool check_null_and_abstract,
1174 TRAPS) {
1175
1176 // setup default return values
1177 int vtable_index = Method::invalid_vtable_index;
1178 methodHandle selected_method;
1179
1180 assert(recv.is_null() || recv->is_oop(), "receiver is not an oop");
1181
1182 // runtime method resolution
1183 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1184 THROW(vmSymbols::java_lang_NullPointerException());
1185 }
1186
1187 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1188 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1189 // a missing receiver might result in a bogus lookup.
1190 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1191
1192 // do lookup based on receiver klass using the vtable index
1193 if (resolved_method->method_holder()->is_interface()) { // default or miranda method
1194 vtable_index = vtable_index_of_interface_method(resolved_klass,
1195 resolved_method);
1196 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1197
1198 InstanceKlass* inst = InstanceKlass::cast(recv_klass());
1199 selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
1200 } else {
1201 // at this point we are sure that resolved_method is virtual and not
1202 // a default or miranda method; therefore, it must have a valid vtable index.
1203 assert(!resolved_method->has_itable_index(), "");
1204 vtable_index = resolved_method->vtable_index();
1205 // We could get a negative vtable_index for final methods,
1206 // because as an optimization they are they are never put in the vtable,
1207 // unless they override an existing method.
1208 // If we do get a negative, it means the resolved method is the the selected
1209 // method, and it can never be changed by an override.
1210 if (vtable_index == Method::nonvirtual_vtable_index) {
1211 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1212 selected_method = resolved_method;
1213 } else {
1214 // recv_klass might be an arrayKlassOop but all vtables start at
1215 // the same place. The cast is to avoid virtual call and assertion.
1216 InstanceKlass* inst = (InstanceKlass*)recv_klass();
1217 selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
1218 }
1219 }
1220
1221 // check if method exists
1222 if (selected_method.is_null()) {
1223 ResourceMark rm(THREAD);
1224 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1225 Method::name_and_sig_as_C_string(resolved_klass(),
1226 resolved_method->name(),
1227 resolved_method->signature()));
1228 }
1229
1230 // check if abstract
1231 if (check_null_and_abstract && selected_method->is_abstract()) {
1232 ResourceMark rm(THREAD);
1233 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1234 Method::name_and_sig_as_C_string(resolved_klass(),
1235 selected_method->name(),
1236 selected_method->signature()));
1237 }
1238
1239 if (PrintVtables && Verbose) {
1240 trace_method_resolution("invokevirtual selected method: receiver-class:",
1241 recv_klass, resolved_klass, selected_method);
1242 tty->print_cr("vtable_index:%d", vtable_index);
1243 }
1244 // setup result
1245 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1246 }
1247
1248 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass,
1249 const LinkInfo& link_info,
1250 bool check_null_and_abstract, TRAPS) {
1251 // throws linktime exceptions
1252 methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK);
1253 runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(),
1254 recv, recv_klass, check_null_and_abstract, CHECK);
1255 }
1256
1257 methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info,
1258 TRAPS) {
1259 // normal interface method resolution
1260 methodHandle resolved_method = resolve_interface_method(link_info, true, CHECK_NULL);
1261 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1262 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1263
1264 return resolved_method;
1265 }
1266
1267 // throws runtime exceptions
1268 void LinkResolver::runtime_resolve_interface_method(CallInfo& result,
1269 const methodHandle& resolved_method,
1270 KlassHandle resolved_klass,
1271 Handle recv,
1272 KlassHandle recv_klass,
1273 bool check_null_and_abstract, TRAPS) {
1274 // check if receiver exists
1275 if (check_null_and_abstract && recv.is_null()) {
1276 THROW(vmSymbols::java_lang_NullPointerException());
1277 }
1278
1279 // check if private interface method
1280 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1281 ResourceMark rm(THREAD);
1282 char buf[200];
1283 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s",
1284 Method::name_and_sig_as_C_string(resolved_klass(),
1285 resolved_method->name(),
1286 resolved_method->signature()));
1287 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1288 }
1289
1290 // check if receiver klass implements the resolved interface
1291 if (!recv_klass->is_subtype_of(resolved_klass())) {
1292 ResourceMark rm(THREAD);
1293 char buf[200];
1294 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1295 recv_klass()->external_name(),
1296 resolved_klass()->external_name());
1297 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1298 }
1299
1300 // do lookup based on receiver klass
1301 // This search must match the linktime preparation search for itable initialization
1302 // to correctly enforce loader constraints for interface method inheritance
1303 methodHandle sel_method = lookup_instance_method_in_klasses(recv_klass,
1304 resolved_method->name(),
1305 resolved_method->signature(), CHECK);
1306 if (sel_method.is_null() && !check_null_and_abstract) {
1307 // In theory this is a harmless placeholder value, but
1308 // in practice leaving in null affects the nsk default method tests.
1309 // This needs further study.
1310 sel_method = resolved_method;
1311 }
1312 // check if method exists
1313 if (sel_method.is_null()) {
1314 ResourceMark rm(THREAD);
1315 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1316 Method::name_and_sig_as_C_string(recv_klass(),
1317 resolved_method->name(),
1318 resolved_method->signature()));
1319 }
1320 // check access
1321 // Throw Illegal Access Error if sel_method is not public.
1322 if (!sel_method->is_public()) {
1323 ResourceMark rm(THREAD);
1324 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
1325 Method::name_and_sig_as_C_string(recv_klass(),
1326 sel_method->name(),
1327 sel_method->signature()));
1328 }
1329 // check if abstract
1330 if (check_null_and_abstract && sel_method->is_abstract()) {
1331 ResourceMark rm(THREAD);
1332 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1333 Method::name_and_sig_as_C_string(recv_klass(),
1334 sel_method->name(),
1335 sel_method->signature()));
1336 }
1337
1338 if (TraceItables && Verbose) {
1339 trace_method_resolution("invokeinterface selected method: receiver-class",
1340 recv_klass, resolved_klass, sel_method);
1341 tty->cr();
1342 }
1343 // setup result
1344 if (!resolved_method->has_itable_index()) {
1345 int vtable_index = resolved_method->vtable_index();
1346 assert(vtable_index == sel_method->vtable_index(), "sanity check");
1347 result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK);
1348 } else {
1349 int itable_index = resolved_method()->itable_index();
1350 result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK);
1351 }
1352 }
1353
1354
1355 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1356 const LinkInfo& link_info) {
1357 EXCEPTION_MARK;
1358 methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD);
1359 if (HAS_PENDING_EXCEPTION) {
1360 CLEAR_PENDING_EXCEPTION;
1361 return methodHandle();
1362 } else {
1363 return method_result;
1364 }
1365 }
1366
1367 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
1368 const LinkInfo& link_info) {
1369 EXCEPTION_MARK;
1370 methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD);
1371 if (HAS_PENDING_EXCEPTION) {
1372 CLEAR_PENDING_EXCEPTION;
1373 return methodHandle();
1374 } else {
1375 return method_result;
1376 }
1377 }
1378
1379 methodHandle LinkResolver::resolve_virtual_call_or_null(
1380 KlassHandle receiver_klass,
1381 const LinkInfo& link_info) {
1382 EXCEPTION_MARK;
1383 CallInfo info;
1384 resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1385 if (HAS_PENDING_EXCEPTION) {
1386 CLEAR_PENDING_EXCEPTION;
1387 return methodHandle();
1388 }
1389 return info.selected_method();
1390 }
1391
1392 methodHandle LinkResolver::resolve_interface_call_or_null(
1393 KlassHandle receiver_klass,
1394 const LinkInfo& link_info) {
1395 EXCEPTION_MARK;
1396 CallInfo info;
1397 resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD);
1398 if (HAS_PENDING_EXCEPTION) {
1399 CLEAR_PENDING_EXCEPTION;
1400 return methodHandle();
1401 }
1402 return info.selected_method();
1403 }
1404
1405 int LinkResolver::resolve_virtual_vtable_index(KlassHandle receiver_klass,
1406 const LinkInfo& link_info) {
1407 EXCEPTION_MARK;
1408 CallInfo info;
1409 resolve_virtual_call(info, Handle(), receiver_klass, link_info,
1410 /*check_null_or_abstract*/false, THREAD);
1411 if (HAS_PENDING_EXCEPTION) {
1412 CLEAR_PENDING_EXCEPTION;
1413 return Method::invalid_vtable_index;
1414 }
1415 return info.vtable_index();
1416 }
1417
1418 methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) {
1419 EXCEPTION_MARK;
1420 CallInfo info;
1421 resolve_static_call(info, link_info, /*initialize_class*/false, THREAD);
1422 if (HAS_PENDING_EXCEPTION) {
1423 CLEAR_PENDING_EXCEPTION;
1424 return methodHandle();
1425 }
1426 return info.selected_method();
1427 }
1428
1429 methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) {
1430 EXCEPTION_MARK;
1431 CallInfo info;
1432 resolve_special_call(info, link_info, THREAD);
1433 if (HAS_PENDING_EXCEPTION) {
1434 CLEAR_PENDING_EXCEPTION;
1435 return methodHandle();
1436 }
1437 return info.selected_method();
1438 }
1439
1440
1441
1442 //------------------------------------------------------------------------------------------------------------------------
1443 // ConstantPool entries
1444
1445 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS) {
1446 switch (byte) {
1447 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1448 case Bytecodes::_invokespecial : resolve_invokespecial (result, pool, index, CHECK); break;
1449 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1450 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1451 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1452 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1453 }
1454 return;
1455 }
1456
1457 void LinkResolver::resolve_invokestatic(CallInfo& result, constantPoolHandle pool, int index, TRAPS) {
1458 LinkInfo link_info(pool, index, CHECK);
1459 resolve_static_call(result, link_info, /*initialize_class*/true, CHECK);
1460 }
1461
1462
1463 void LinkResolver::resolve_invokespecial(CallInfo& result, constantPoolHandle pool, int index, TRAPS) {
1464 LinkInfo link_info(pool, index, CHECK);
1465 resolve_special_call(result, link_info, CHECK);
1466 }
1467
1468
1469 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1470 constantPoolHandle pool, int index,
1471 TRAPS) {
1472
1473 LinkInfo link_info(pool, index, CHECK);
1474 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1475 resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK);
1476 }
1477
1478
1479 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS) {
1480 LinkInfo link_info(pool, index, CHECK);
1481 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1482 resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK);
1483 }
1484
1485
1486 void LinkResolver::resolve_invokehandle(CallInfo& result, constantPoolHandle pool, int index, TRAPS) {
1487 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1488 LinkInfo link_info(pool, index, CHECK);
1489 if (TraceMethodHandles) {
1490 ResourceMark rm(THREAD);
1491 tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(),
1492 link_info.signature()->as_C_string());
1493 }
1494 resolve_handle_call(result, link_info, CHECK);
1495 }
1496
1497 void LinkResolver::resolve_handle_call(CallInfo& result,
1498 const LinkInfo& link_info,
1499 TRAPS) {
1500 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1501 assert(link_info.resolved_klass()() == SystemDictionary::MethodHandle_klass(), "");
1502 assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), "");
1503 Handle resolved_appendix;
1504 Handle resolved_method_type;
1505 methodHandle resolved_method = lookup_polymorphic_method(link_info,
1506 &resolved_appendix, &resolved_method_type, CHECK);
1507 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, CHECK);
1508 }
1509
1510 static void wrap_invokedynamic_exception(TRAPS) {
1511 if (HAS_PENDING_EXCEPTION) {
1512 if (TraceMethodHandles) {
1513 tty->print_cr("invokedynamic throws BSME for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION));
1514 PENDING_EXCEPTION->print();
1515 }
1516 if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) {
1517 // throw these guys, since they are already wrapped
1518 return;
1519 }
1520 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1521 // intercept only LinkageErrors which might have failed to wrap
1522 return;
1523 }
1524 // See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS.
1525 Handle nested_exception(THREAD, PENDING_EXCEPTION);
1526 CLEAR_PENDING_EXCEPTION;
1527 THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception)
1528 }
1529 }
1530
1531 void LinkResolver::resolve_invokedynamic(CallInfo& result, constantPoolHandle pool, int index, TRAPS) {
1532 Symbol* method_name = pool->name_ref_at(index);
1533 Symbol* method_signature = pool->signature_ref_at(index);
1534 KlassHandle current_klass = KlassHandle(THREAD, pool->pool_holder());
1535
1536 // Resolve the bootstrap specifier (BSM + optional arguments).
1537 Handle bootstrap_specifier;
1538 // Check if CallSite has been bound already:
1539 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1540 if (cpce->is_f1_null()) {
1541 int pool_index = cpce->constant_pool_index();
1542 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD);
1543 wrap_invokedynamic_exception(CHECK);
1544 assert(bsm_info != NULL, "");
1545 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
1546 bootstrap_specifier = Handle(THREAD, bsm_info);
1547 }
1548 if (!cpce->is_f1_null()) {
1549 methodHandle method( THREAD, cpce->f1_as_method());
1550 Handle appendix( THREAD, cpce->appendix_if_resolved(pool));
1551 Handle method_type(THREAD, cpce->method_type_if_resolved(pool));
1552 result.set_handle(method, appendix, method_type, THREAD);
1553 wrap_invokedynamic_exception(CHECK);
1554 return;
1555 }
1556
1557 if (TraceMethodHandles) {
1558 ResourceMark rm(THREAD);
1559 tty->print_cr("resolve_invokedynamic #%d %s %s",
1560 ConstantPool::decode_invokedynamic_index(index),
1561 method_name->as_C_string(), method_signature->as_C_string());
1562 tty->print(" BSM info: "); bootstrap_specifier->print();
1563 }
1564
1565 resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK);
1566 }
1567
1568 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1569 Handle bootstrap_specifier,
1570 Symbol* method_name, Symbol* method_signature,
1571 KlassHandle current_klass,
1572 TRAPS) {
1573 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...)
1574 // The appendix argument is likely to be a freshly-created CallSite.
1575 Handle resolved_appendix;
1576 Handle resolved_method_type;
1577 methodHandle resolved_method =
1578 SystemDictionary::find_dynamic_call_site_invoker(current_klass,
1579 bootstrap_specifier,
1580 method_name, method_signature,
1581 &resolved_appendix,
1582 &resolved_method_type,
1583 THREAD);
1584 wrap_invokedynamic_exception(CHECK);
1585 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD);
1586 wrap_invokedynamic_exception(CHECK);
1587 }
1588
1589 #ifndef PRODUCT
1590 void LinkResolver::trace_method_resolution(const char* prefix,
1591 KlassHandle klass,
1592 KlassHandle resolved_klass,
1593 const methodHandle& method) {
1594 ResourceMark rm;
1595 tty->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
1596 prefix,
1597 (klass.is_null() ? "<NULL>" : klass->internal_name()),
1598 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
1599 Method::name_and_sig_as_C_string(resolved_klass(),
1600 method->name(),
1601 method->signature()),
1602 method->method_holder()->internal_name()
1603 );
1604 method->access_flags().print_on(tty);
1605 if (method->is_default_method()) {
1606 tty->print("default ");
1607 }
1608 if (method->is_overpass()) {
1609 tty->print("overpass ");
1610 }
1611 }
1612 #endif // PRODUCT