1 /*
2 * Copyright (c) 1997, 2013, 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_interface/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 "prims/methodHandles.hpp"
39 #include "prims/nativeLookup.hpp"
40 #include "runtime/compilationPolicy.hpp"
41 #include "runtime/fieldDescriptor.hpp"
42 #include "runtime/frame.inline.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/reflection.hpp"
45 #include "runtime/signature.hpp"
46 #include "runtime/thread.inline.hpp"
47 #include "runtime/vmThread.hpp"
48
49
50 //------------------------------------------------------------------------------------------------------------------------
51 // Implementation of CallInfo
52
53
54 void CallInfo::set_static(KlassHandle resolved_klass, methodHandle resolved_method, TRAPS) {
55 int vtable_index = Method::nonvirtual_vtable_index;
56 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
57 }
58
59
60 void CallInfo::set_interface(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int itable_index, TRAPS) {
61 // This is only called for interface methods. If the resolved_method
62 // comes from java/lang/Object, it can be the subject of a virtual call, so
63 // we should pick the vtable index from the resolved method.
64 // In that case, the caller must call set_virtual instead of set_interface.
65 assert(resolved_method->method_holder()->is_interface(), "");
66 assert(itable_index == resolved_method()->itable_index(), "");
67 set_common(resolved_klass, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
68 }
69
70 void CallInfo::set_virtual(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index, TRAPS) {
71 assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
72 assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
73 CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
74 set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
75 assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
76 }
77
78 void CallInfo::set_handle(methodHandle resolved_method, Handle resolved_appendix, Handle resolved_method_type, TRAPS) {
79 if (resolved_method.is_null()) {
80 THROW_MSG(vmSymbols::java_lang_InternalError(), "resolved method is null");
81 }
82 KlassHandle resolved_klass = SystemDictionary::MethodHandle_klass();
83 assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
84 resolved_method->is_compiled_lambda_form(),
85 "linkMethod must return one of these");
86 int vtable_index = Method::nonvirtual_vtable_index;
87 assert(!resolved_method->has_vtable_index(), "");
88 set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
89 _resolved_appendix = resolved_appendix;
90 _resolved_method_type = resolved_method_type;
91 }
92
93 void CallInfo::set_common(KlassHandle resolved_klass,
94 KlassHandle selected_klass,
95 methodHandle resolved_method,
96 methodHandle selected_method,
97 CallKind kind,
98 int index,
99 TRAPS) {
100 assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
101 _resolved_klass = resolved_klass;
102 _selected_klass = selected_klass;
103 _resolved_method = resolved_method;
104 _selected_method = selected_method;
105 _call_kind = kind;
106 _call_index = index;
107 _resolved_appendix = Handle();
108 DEBUG_ONLY(verify()); // verify before making side effects
109
110 if (CompilationPolicy::must_be_compiled(selected_method)) {
111 // This path is unusual, mostly used by the '-Xcomp' stress test mode.
112
113 // Note: with several active threads, the must_be_compiled may be true
114 // while can_be_compiled is false; remove assert
115 // assert(CompilationPolicy::can_be_compiled(selected_method), "cannot compile");
116 if (THREAD->is_Compiler_thread()) {
117 // don't force compilation, resolve was on behalf of compiler
118 return;
119 }
120 if (selected_method->method_holder()->is_not_initialized()) {
121 // 'is_not_initialized' means not only '!is_initialized', but also that
122 // initialization has not been started yet ('!being_initialized')
123 // Do not force compilation of methods in uninitialized classes.
124 // Note that doing this would throw an assert later,
125 // in CompileBroker::compile_method.
126 // We sometimes use the link resolver to do reflective lookups
127 // even before classes are initialized.
128 return;
129 }
130 CompileBroker::compile_method(selected_method, InvocationEntryBci,
131 CompilationPolicy::policy()->initial_compile_level(),
132 methodHandle(), 0, "must_be_compiled", CHECK);
133 }
134 }
135
136 // utility query for unreflecting a method
137 CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass) {
138 Klass* resolved_method_holder = resolved_method->method_holder();
139 if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
140 resolved_klass = resolved_method_holder;
141 }
142 _resolved_klass = resolved_klass;
143 _selected_klass = resolved_klass;
144 _resolved_method = resolved_method;
145 _selected_method = resolved_method;
146 // classify:
147 CallKind kind = CallInfo::unknown_kind;
148 int index = resolved_method->vtable_index();
149 if (resolved_method->can_be_statically_bound()) {
150 kind = CallInfo::direct_call;
151 } else if (!resolved_method_holder->is_interface()) {
152 // Could be an Object method inherited into an interface, but still a vtable call.
153 kind = CallInfo::vtable_call;
154 } else if (!resolved_klass->is_interface()) {
155 // A miranda method. Compute the vtable index.
156 ResourceMark rm;
157 klassVtable* vt = InstanceKlass::cast(resolved_klass)->vtable();
158 index = vt->index_of_miranda(resolved_method->name(),
159 resolved_method->signature());
160 kind = CallInfo::vtable_call;
161 } else if (resolved_method->has_vtable_index()) {
162 // Can occur if an interface redeclares a method of Object.
163
164 #ifdef ASSERT
165 // Ensure that this is really the case.
166 KlassHandle object_klass = SystemDictionary::Object_klass();
167 Method * object_resolved_method = object_klass()->vtable()->method_at(index);
168 assert(object_resolved_method->name() == resolved_method->name(),
169 err_msg("Object and interface method names should match at vtable index %d, %s != %s",
170 index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string()));
171 assert(object_resolved_method->signature() == resolved_method->signature(),
172 err_msg("Object and interface method signatures should match at vtable index %d, %s != %s",
173 index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string()));
174 #endif // ASSERT
175
176 kind = CallInfo::vtable_call;
177 } else {
178 // A regular interface call.
179 kind = CallInfo::itable_call;
180 index = resolved_method->itable_index();
181 }
182 assert(index == Method::nonvirtual_vtable_index || index >= 0, err_msg("bad index %d", index));
183 _call_kind = kind;
184 _call_index = index;
185 _resolved_appendix = Handle();
186 DEBUG_ONLY(verify());
187 }
188
189 #ifdef ASSERT
190 void CallInfo::verify() {
191 switch (call_kind()) { // the meaning and allowed value of index depends on kind
192 case CallInfo::direct_call:
193 if (_call_index == Method::nonvirtual_vtable_index) break;
194 // else fall through to check vtable index:
195 case CallInfo::vtable_call:
196 assert(resolved_klass()->verify_vtable_index(_call_index), "");
197 break;
198 case CallInfo::itable_call:
199 assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
200 break;
201 case CallInfo::unknown_kind:
202 assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
203 break;
204 default:
205 fatal(err_msg_res("Unexpected call kind %d", call_kind()));
206 }
207 }
208 #endif //ASSERT
209
210
211
212 //------------------------------------------------------------------------------------------------------------------------
213 // Klass resolution
214
215 void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) {
216 if (!Reflection::verify_class_access(ref_klass(),
217 sel_klass(),
218 true)) {
219 ResourceMark rm(THREAD);
220 Exceptions::fthrow(
221 THREAD_AND_LOCATION,
222 vmSymbols::java_lang_IllegalAccessError(),
223 "tried to access class %s from class %s",
224 sel_klass->external_name(),
225 ref_klass->external_name()
226 );
227 return;
228 }
229 }
230
231 void LinkResolver::resolve_klass(KlassHandle& result, constantPoolHandle pool, int index, TRAPS) {
232 Klass* result_oop = pool->klass_ref_at(index, CHECK);
233 result = KlassHandle(THREAD, result_oop);
234 }
235
236 //------------------------------------------------------------------------------------------------------------------------
237 // Method resolution
238 //
239 // According to JVM spec. $5.4.3c & $5.4.3d
240
241 void LinkResolver::lookup_method_in_klasses(methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) {
242 Method* result_oop = klass->uncached_lookup_method(name, signature);
243 if (EnableInvokeDynamic && result_oop != NULL) {
244 vmIntrinsics::ID iid = result_oop->intrinsic_id();
245 if (MethodHandles::is_signature_polymorphic(iid)) {
246 // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
247 return;
248 }
249 }
250 result = methodHandle(THREAD, result_oop);
251 }
252
253 // returns first instance method
254 void LinkResolver::lookup_instance_method_in_klasses(methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) {
255 Method* result_oop = klass->uncached_lookup_method(name, signature);
256 result = methodHandle(THREAD, result_oop);
257 while (!result.is_null() && result->is_static()) {
258 klass = KlassHandle(THREAD, result->method_holder()->super());
259 result = methodHandle(THREAD, klass->uncached_lookup_method(name, signature));
260 }
261 }
262
263
264 int LinkResolver::vtable_index_of_miranda_method(KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) {
265 ResourceMark rm(THREAD);
266 klassVtable *vt = InstanceKlass::cast(klass())->vtable();
267 return vt->index_of_miranda(name, signature);
268 }
269
270 void LinkResolver::lookup_method_in_interfaces(methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) {
271 InstanceKlass *ik = InstanceKlass::cast(klass());
272 result = methodHandle(THREAD, ik->lookup_method_in_all_interfaces(name, signature));
273 }
274
275 void LinkResolver::lookup_polymorphic_method(methodHandle& result,
276 KlassHandle klass, Symbol* name, Symbol* full_signature,
277 KlassHandle current_klass,
278 Handle *appendix_result_or_null,
279 Handle *method_type_result,
280 TRAPS) {
281 vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
282 if (TraceMethodHandles) {
283 ResourceMark rm(THREAD);
284 tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
285 vmIntrinsics::name_at(iid), klass->external_name(),
286 name->as_C_string(), full_signature->as_C_string());
287 }
288 if (EnableInvokeDynamic &&
289 klass() == SystemDictionary::MethodHandle_klass() &&
290 iid != vmIntrinsics::_none) {
291 if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
292 // Most of these do not need an up-call to Java to resolve, so can be done anywhere.
293 // Do not erase last argument type (MemberName) if it is a static linkTo method.
294 bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
295 TempNewSymbol basic_signature =
296 MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK);
297 if (TraceMethodHandles) {
298 ResourceMark rm(THREAD);
299 tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
300 name->as_C_string(),
301 full_signature->as_C_string(),
302 basic_signature->as_C_string());
303 }
304 result = SystemDictionary::find_method_handle_intrinsic(iid,
305 basic_signature,
306 CHECK);
307 if (result.not_null()) {
308 assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
309 assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
310 assert(basic_signature == result->signature(), "predict the result signature");
311 if (TraceMethodHandles) {
312 tty->print("lookup_polymorphic_method => intrinsic ");
313 result->print_on(tty);
314 }
315 return;
316 }
317 } else if (iid == vmIntrinsics::_invokeGeneric
318 && !THREAD->is_Compiler_thread()
319 && appendix_result_or_null != NULL) {
320 // This is a method with type-checking semantics.
321 // We will ask Java code to spin an adapter method for it.
322 if (!MethodHandles::enabled()) {
323 // Make sure the Java part of the runtime has been booted up.
324 Klass* natives = SystemDictionary::MethodHandleNatives_klass();
325 if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
326 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
327 Handle(),
328 Handle(),
329 true,
330 CHECK);
331 }
332 }
333
334 Handle appendix;
335 Handle method_type;
336 result = SystemDictionary::find_method_handle_invoker(name,
337 full_signature,
338 current_klass,
339 &appendix,
340 &method_type,
341 CHECK);
342 if (TraceMethodHandles) {
343 tty->print("lookup_polymorphic_method => (via Java) ");
344 result->print_on(tty);
345 tty->print(" lookup_polymorphic_method => appendix = ");
346 if (appendix.is_null()) tty->print_cr("(none)");
347 else appendix->print_on(tty);
348 }
349 if (result.not_null()) {
350 #ifdef ASSERT
351 ResourceMark rm(THREAD);
352
353 TempNewSymbol basic_signature =
354 MethodHandles::lookup_basic_type_signature(full_signature, CHECK);
355 int actual_size_of_params = result->size_of_parameters();
356 int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
357 // +1 for MethodHandle.this, +1 for trailing MethodType
358 if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
359 if (appendix.not_null()) expected_size_of_params += 1;
360 if (actual_size_of_params != expected_size_of_params) {
361 tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
362 tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
363 result->print();
364 }
365 assert(actual_size_of_params == expected_size_of_params,
366 err_msg("%d != %d", actual_size_of_params, expected_size_of_params));
367 #endif //ASSERT
368
369 assert(appendix_result_or_null != NULL, "");
370 (*appendix_result_or_null) = appendix;
371 (*method_type_result) = method_type;
372 return;
373 }
374 }
375 }
376 }
377
378 void LinkResolver::check_method_accessability(KlassHandle ref_klass,
379 KlassHandle resolved_klass,
380 KlassHandle sel_klass,
381 methodHandle sel_method,
382 TRAPS) {
383
384 AccessFlags flags = sel_method->access_flags();
385
386 // Special case: arrays always override "clone". JVMS 2.15.
387 // If the resolved klass is an array class, and the declaring class
388 // is java.lang.Object and the method is "clone", set the flags
389 // to public.
390 //
391 // We'll check for the method name first, as that's most likely
392 // to be false (so we'll short-circuit out of these tests).
393 if (sel_method->name() == vmSymbols::clone_name() &&
394 sel_klass() == SystemDictionary::Object_klass() &&
395 resolved_klass->oop_is_array()) {
396 // We need to change "protected" to "public".
397 assert(flags.is_protected(), "clone not protected?");
398 jint new_flags = flags.as_int();
399 new_flags = new_flags & (~JVM_ACC_PROTECTED);
400 new_flags = new_flags | JVM_ACC_PUBLIC;
401 flags.set_flags(new_flags);
402 }
403 // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
404
405 if (!Reflection::verify_field_access(ref_klass(),
406 resolved_klass(),
407 sel_klass(),
408 flags,
409 true)) {
410 ResourceMark rm(THREAD);
411 Exceptions::fthrow(
412 THREAD_AND_LOCATION,
413 vmSymbols::java_lang_IllegalAccessError(),
414 "tried to access method %s.%s%s from class %s",
415 sel_klass->external_name(),
416 sel_method->name()->as_C_string(),
417 sel_method->signature()->as_C_string(),
418 ref_klass->external_name()
419 );
420 return;
421 }
422 }
423
424 void LinkResolver::resolve_method_statically(methodHandle& resolved_method, KlassHandle& resolved_klass,
425 Bytecodes::Code code, constantPoolHandle pool, int index, TRAPS) {
426 // This method is used only
427 // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
428 // and
429 // (2) in Bytecode_invoke::static_target
430 // It appears to fail when applied to an invokeinterface call site.
431 // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
432 // resolve klass
433 if (code == Bytecodes::_invokedynamic) {
434 resolved_klass = SystemDictionary::MethodHandle_klass();
435 Symbol* method_name = vmSymbols::invoke_name();
436 Symbol* method_signature = pool->signature_ref_at(index);
437 KlassHandle current_klass(THREAD, pool->pool_holder());
438 resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, CHECK);
439 return;
440 }
441
442 resolve_klass(resolved_klass, pool, index, CHECK);
443
444 Symbol* method_name = pool->name_ref_at(index);
445 Symbol* method_signature = pool->signature_ref_at(index);
446 KlassHandle current_klass(THREAD, pool->pool_holder());
447
448 if (pool->has_preresolution()
449 || (resolved_klass() == SystemDictionary::MethodHandle_klass() &&
450 MethodHandles::is_signature_polymorphic_name(resolved_klass(), method_name))) {
451 Method* result_oop = ConstantPool::method_at_if_loaded(pool, index);
452 if (result_oop != NULL) {
453 resolved_method = methodHandle(THREAD, result_oop);
454 return;
455 }
456 }
457
458 if (code == Bytecodes::_invokeinterface) {
459 resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, CHECK);
460 } else {
461 resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, CHECK);
462 }
463 }
464
465 void LinkResolver::resolve_method(methodHandle& resolved_method, KlassHandle resolved_klass,
466 Symbol* method_name, Symbol* method_signature,
467 KlassHandle current_klass, bool check_access, TRAPS) {
468
469 Handle nested_exception;
470
471 // 1. lookup method in resolved klass and its super klasses
472 lookup_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, CHECK);
473
474 if (resolved_method.is_null()) { // not found in the class hierarchy
475 // 2. lookup method in all the interfaces implemented by the resolved klass
476 lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK);
477
478 if (resolved_method.is_null()) {
479 // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
480 lookup_polymorphic_method(resolved_method, resolved_klass, method_name, method_signature,
481 current_klass, (Handle*)NULL, (Handle*)NULL, THREAD);
482 if (HAS_PENDING_EXCEPTION) {
483 nested_exception = Handle(THREAD, PENDING_EXCEPTION);
484 CLEAR_PENDING_EXCEPTION;
485 }
486 }
487
488 if (resolved_method.is_null()) {
489 // 3. method lookup failed
490 ResourceMark rm(THREAD);
491 THROW_MSG_CAUSE(vmSymbols::java_lang_NoSuchMethodError(),
492 Method::name_and_sig_as_C_string(resolved_klass(),
493 method_name,
494 method_signature),
495 nested_exception);
496 }
497 }
498
499 // 4. check if klass is not interface
500 if (resolved_klass->is_interface() && resolved_method->is_abstract()) {
501 ResourceMark rm(THREAD);
502 char buf[200];
503 jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
504 resolved_klass()->external_name());
505 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
506 }
507
508 // 5. check if method is concrete
509 if (resolved_method->is_abstract() && !resolved_klass->is_abstract()) {
510 ResourceMark rm(THREAD);
511 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
512 Method::name_and_sig_as_C_string(resolved_klass(),
513 method_name,
514 method_signature));
515 }
516
517 // 6. access checks, access checking may be turned off when calling from within the VM.
518 if (check_access) {
519 assert(current_klass.not_null() , "current_klass should not be null");
520
521 // check if method can be accessed by the referring class
522 check_method_accessability(current_klass,
523 resolved_klass,
524 KlassHandle(THREAD, resolved_method->method_holder()),
525 resolved_method,
526 CHECK);
527
528 // check loader constraints
529 Handle loader (THREAD, InstanceKlass::cast(current_klass())->class_loader());
530 Handle class_loader (THREAD, resolved_method->method_holder()->class_loader());
531 {
532 ResourceMark rm(THREAD);
533 Symbol* failed_type_symbol =
534 SystemDictionary::check_signature_loaders(method_signature, loader,
535 class_loader, true, CHECK);
536 if (failed_type_symbol != NULL) {
537 const char* msg = "loader constraint violation: when resolving method"
538 " \"%s\" the class loader (instance of %s) of the current class, %s,"
539 " and the class loader (instance of %s) for the method's defining class, %s, have"
540 " different Class objects for the type %s used in the signature";
541 char* sig = Method::name_and_sig_as_C_string(resolved_klass(),method_name,method_signature);
542 const char* loader1 = SystemDictionary::loader_name(loader());
543 char* current = InstanceKlass::cast(current_klass())->name()->as_C_string();
544 const char* loader2 = SystemDictionary::loader_name(class_loader());
545 char* target = InstanceKlass::cast(resolved_method->method_holder())
546 ->name()->as_C_string();
547 char* failed_type_name = failed_type_symbol->as_C_string();
548 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) +
549 strlen(current) + strlen(loader2) + strlen(target) +
550 strlen(failed_type_name) + 1;
551 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
552 jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2,
553 target, failed_type_name);
554 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
555 }
556 }
557 }
558 }
559
560 void LinkResolver::resolve_interface_method(methodHandle& resolved_method,
561 KlassHandle resolved_klass,
562 Symbol* method_name,
563 Symbol* method_signature,
564 KlassHandle current_klass,
565 bool check_access, TRAPS) {
566
567 // check if klass is interface
568 if (!resolved_klass->is_interface()) {
569 ResourceMark rm(THREAD);
570 char buf[200];
571 jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass()->external_name());
572 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
573 }
574
575 // lookup method in this interface or its super, java.lang.Object
576 lookup_instance_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, CHECK);
577
578 if (resolved_method.is_null()) {
579 // lookup method in all the super-interfaces
580 lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK);
581 if (resolved_method.is_null()) {
582 // no method found
583 ResourceMark rm(THREAD);
584 THROW_MSG(vmSymbols::java_lang_NoSuchMethodError(),
585 Method::name_and_sig_as_C_string(resolved_klass(),
586 method_name,
587 method_signature));
588 }
589 }
590
591 if (check_access) {
592 // JDK8 adds non-public interface methods, and accessability check requirement
593 assert(current_klass.not_null() , "current_klass should not be null");
594
595 // check if method can be accessed by the referring class
596 check_method_accessability(current_klass,
597 resolved_klass,
598 KlassHandle(THREAD, resolved_method->method_holder()),
599 resolved_method,
600 CHECK);
601
602 HandleMark hm(THREAD);
603 Handle loader (THREAD, InstanceKlass::cast(current_klass())->class_loader());
604 Handle class_loader (THREAD, resolved_method->method_holder()->class_loader());
605 {
606 ResourceMark rm(THREAD);
607 Symbol* failed_type_symbol =
608 SystemDictionary::check_signature_loaders(method_signature, loader,
609 class_loader, true, CHECK);
610 if (failed_type_symbol != NULL) {
611 const char* msg = "loader constraint violation: when resolving "
612 "interface method \"%s\" the class loader (instance of %s) of the "
613 "current class, %s, and the class loader (instance of %s) for "
614 "the method's defining class, %s, have different Class objects for the type %s "
615 "used in the signature";
616 char* sig = Method::name_and_sig_as_C_string(resolved_klass(),method_name,method_signature);
617 const char* loader1 = SystemDictionary::loader_name(loader());
618 char* current = InstanceKlass::cast(current_klass())->name()->as_C_string();
619 const char* loader2 = SystemDictionary::loader_name(class_loader());
620 char* target = InstanceKlass::cast(resolved_method->method_holder())
621 ->name()->as_C_string();
622 char* failed_type_name = failed_type_symbol->as_C_string();
623 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) +
624 strlen(current) + strlen(loader2) + strlen(target) +
625 strlen(failed_type_name) + 1;
626 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
627 jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2,
628 target, failed_type_name);
629 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
630 }
631 }
632 }
633
634 if (TraceItables && Verbose) {
635 ResourceMark rm(THREAD);
636 tty->print("invokeinterface resolved method: caller-class:%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
637 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()),
638 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
639 Method::name_and_sig_as_C_string(resolved_klass(),
640 resolved_method->name(),
641 resolved_method->signature()),
642 resolved_method->method_holder()->internal_name()
643 );
644 resolved_method->access_flags().print_on(tty);
645 tty->cr();
646 }
647 }
648
649 //------------------------------------------------------------------------------------------------------------------------
650 // Field resolution
651
652 void LinkResolver::check_field_accessability(KlassHandle ref_klass,
653 KlassHandle resolved_klass,
654 KlassHandle sel_klass,
655 fieldDescriptor& fd,
656 TRAPS) {
657 if (!Reflection::verify_field_access(ref_klass(),
658 resolved_klass(),
659 sel_klass(),
660 fd.access_flags(),
661 true)) {
662 ResourceMark rm(THREAD);
663 Exceptions::fthrow(
664 THREAD_AND_LOCATION,
665 vmSymbols::java_lang_IllegalAccessError(),
666 "tried to access field %s.%s from class %s",
667 sel_klass->external_name(),
668 fd.name()->as_C_string(),
669 ref_klass->external_name()
670 );
671 return;
672 }
673 }
674
675 void LinkResolver::resolve_field_access(fieldDescriptor& result, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS) {
676 // Load these early in case the resolve of the containing klass fails
677 Symbol* field = pool->name_ref_at(index);
678 Symbol* sig = pool->signature_ref_at(index);
679
680 // resolve specified klass
681 KlassHandle resolved_klass;
682 resolve_klass(resolved_klass, pool, index, CHECK);
683
684 KlassHandle current_klass(THREAD, pool->pool_holder());
685 resolve_field(result, resolved_klass, field, sig, current_klass, byte, true, true, CHECK);
686 }
687
688 void LinkResolver::resolve_field(fieldDescriptor& fd, KlassHandle resolved_klass, Symbol* field, Symbol* sig,
689 KlassHandle current_klass, Bytecodes::Code byte, bool check_access, bool initialize_class,
690 TRAPS) {
691 assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
692 byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
693 (byte == Bytecodes::_nop && !check_access), "bad field access bytecode");
694
695 bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
696 bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic);
697
698 // Check if there's a resolved klass containing the field
699 if (resolved_klass.is_null()) {
700 ResourceMark rm(THREAD);
701 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
702 }
703
704 // Resolve instance field
705 KlassHandle sel_klass(THREAD, InstanceKlass::cast(resolved_klass())->find_field(field, sig, &fd));
706 // check if field exists; i.e., if a klass containing the field def has been selected
707 if (sel_klass.is_null()) {
708 ResourceMark rm(THREAD);
709 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
710 }
711
712 if (!check_access)
713 // Access checking may be turned off when calling from within the VM.
714 return;
715
716 // check access
717 check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
718
719 // check for errors
720 if (is_static != fd.is_static()) {
721 ResourceMark rm(THREAD);
722 char msg[200];
723 jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass()->external_name(), fd.name()->as_C_string());
724 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
725 }
726
727 // Final fields can only be accessed from its own class.
728 if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) {
729 THROW(vmSymbols::java_lang_IllegalAccessError());
730 }
731
732 // initialize resolved_klass if necessary
733 // note 1: the klass which declared the field must be initialized (i.e, sel_klass)
734 // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
735 //
736 // note 2: we don't want to force initialization if we are just checking
737 // if the field access is legal; e.g., during compilation
738 if (is_static && initialize_class) {
739 sel_klass->initialize(CHECK);
740 }
741
742 if (sel_klass() != current_klass()) {
743 HandleMark hm(THREAD);
744 Handle ref_loader (THREAD, InstanceKlass::cast(current_klass())->class_loader());
745 Handle sel_loader (THREAD, InstanceKlass::cast(sel_klass())->class_loader());
746 {
747 ResourceMark rm(THREAD);
748 Symbol* failed_type_symbol =
749 SystemDictionary::check_signature_loaders(sig,
750 ref_loader, sel_loader,
751 false,
752 CHECK);
753 if (failed_type_symbol != NULL) {
754 const char* msg = "loader constraint violation: when resolving field"
755 " \"%s\" the class loader (instance of %s) of the referring class, "
756 "%s, and the class loader (instance of %s) for the field's resolved "
757 "type, %s, have different Class objects for that type";
758 char* field_name = field->as_C_string();
759 const char* loader1 = SystemDictionary::loader_name(ref_loader());
760 char* sel = InstanceKlass::cast(sel_klass())->name()->as_C_string();
761 const char* loader2 = SystemDictionary::loader_name(sel_loader());
762 char* failed_type_name = failed_type_symbol->as_C_string();
763 size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1) +
764 strlen(sel) + strlen(loader2) + strlen(failed_type_name) + 1;
765 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
766 jio_snprintf(buf, buflen, msg, field_name, loader1, sel, loader2,
767 failed_type_name);
768 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
769 }
770 }
771 }
772
773 // return information. note that the klass is set to the actual klass containing the
774 // field, otherwise access of static fields in superclasses will not work.
775 }
776
777
778 //------------------------------------------------------------------------------------------------------------------------
779 // Invoke resolution
780 //
781 // Naming conventions:
782 //
783 // resolved_method the specified method (i.e., static receiver specified via constant pool index)
784 // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
785 // resolved_klass the specified klass (i.e., specified via constant pool index)
786 // recv_klass the receiver klass
787
788
789 void LinkResolver::resolve_static_call(CallInfo& result, KlassHandle& resolved_klass, Symbol* method_name,
790 Symbol* method_signature, KlassHandle current_klass,
791 bool check_access, bool initialize_class, TRAPS) {
792 methodHandle resolved_method;
793 linktime_resolve_static_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
794 resolved_klass = KlassHandle(THREAD, resolved_method->method_holder());
795
796 // Initialize klass (this should only happen if everything is ok)
797 if (initialize_class && resolved_klass->should_be_initialized()) {
798 resolved_klass->initialize(CHECK);
799 linktime_resolve_static_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
800 }
801
802 // setup result
803 result.set_static(resolved_klass, resolved_method, CHECK);
804 }
805
806 // throws linktime exceptions
807 void LinkResolver::linktime_resolve_static_method(methodHandle& resolved_method, KlassHandle resolved_klass,
808 Symbol* method_name, Symbol* method_signature,
809 KlassHandle current_klass, bool check_access, TRAPS) {
810
811 resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
812 assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
813
814 // check if static
815 if (!resolved_method->is_static()) {
816 ResourceMark rm(THREAD);
817 char buf[200];
818 jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
819 resolved_method->name(),
820 resolved_method->signature()));
821 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
822 }
823 }
824
825
826 void LinkResolver::resolve_special_call(CallInfo& result, KlassHandle resolved_klass, Symbol* method_name,
827 Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) {
828 methodHandle resolved_method;
829 linktime_resolve_special_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
830 runtime_resolve_special_method(result, resolved_method, resolved_klass, current_klass, check_access, CHECK);
831 }
832
833 // throws linktime exceptions
834 void LinkResolver::linktime_resolve_special_method(methodHandle& resolved_method, KlassHandle resolved_klass,
835 Symbol* method_name, Symbol* method_signature,
836 KlassHandle current_klass, bool check_access, TRAPS) {
837
838 // Invokespecial is called for multiple special reasons:
839 // <init>
840 // local private method invocation, for classes and interfaces
841 // superclass.method, which can also resolve to a default method
842 // and the selected method is recalculated relative to the direct superclass
843 // superinterface.method, which explicitly does not check shadowing
844
845 resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
846
847 // check if method name is <init>, that it is found in same klass as static type
848 if (resolved_method->name() == vmSymbols::object_initializer_name() &&
849 resolved_method->method_holder() != resolved_klass()) {
850 ResourceMark rm(THREAD);
851 Exceptions::fthrow(
852 THREAD_AND_LOCATION,
853 vmSymbols::java_lang_NoSuchMethodError(),
854 "%s: method %s%s not found",
855 resolved_klass->external_name(),
856 resolved_method->name()->as_C_string(),
857 resolved_method->signature()->as_C_string()
858 );
859 return;
860 }
861
862 // check if not static
863 if (resolved_method->is_static()) {
864 ResourceMark rm(THREAD);
865 char buf[200];
866 jio_snprintf(buf, sizeof(buf),
867 "Expecting non-static method %s",
868 Method::name_and_sig_as_C_string(resolved_klass(),
869 resolved_method->name(),
870 resolved_method->signature()));
871 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
872 }
873 if (TraceItables && Verbose) {
874 ResourceMark rm(THREAD);
875 tty->print("invokespecial resolved method: caller-class:%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
876 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()),
877 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
878 Method::name_and_sig_as_C_string(resolved_klass(),
879 resolved_method->name(),
880 resolved_method->signature()),
881 resolved_method->method_holder()->internal_name()
882 );
883 resolved_method->access_flags().print_on(tty);
884 if (resolved_method->method_holder()->is_interface() &&
885 !resolved_method->is_abstract()) {
886 tty->print("default");
887 }
888 if (resolved_method->is_overpass()) {
889 tty->print("overpass");
890 }
891 tty->cr();
892 }
893 }
894
895 // throws runtime exceptions
896 void LinkResolver::runtime_resolve_special_method(CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass,
897 KlassHandle current_klass, bool check_access, TRAPS) {
898
899 // resolved method is selected method unless we have an old-style lookup
900 // for a superclass method
901 // Invokespecial for a superinterface, resolved method is selected method,
902 // no checks for shadowing
903 methodHandle sel_method(THREAD, resolved_method());
904
905 // check if this is an old-style super call and do a new lookup if so
906 { KlassHandle method_klass = KlassHandle(THREAD,
907 resolved_method->method_holder());
908
909 if (check_access &&
910 // a) check if ACC_SUPER flag is set for the current class
911 (current_klass->is_super() || !AllowNonVirtualCalls) &&
912 // b) check if the class of the resolved_klass is a superclass
913 // (not supertype in order to exclude interface classes) of the current class.
914 // This check is not performed for super.invoke for interface methods
915 // in super interfaces.
916 current_klass->is_subclass_of(resolved_klass()) &&
917 current_klass() != resolved_klass() &&
918 // c) check if the method is not <init>
919 resolved_method->name() != vmSymbols::object_initializer_name()) {
920 // Lookup super method
921 KlassHandle super_klass(THREAD, current_klass->super());
922 lookup_instance_method_in_klasses(sel_method, super_klass,
923 resolved_method->name(),
924 resolved_method->signature(), CHECK);
925 // check if found
926 if (sel_method.is_null()) {
927 ResourceMark rm(THREAD);
928 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
929 Method::name_and_sig_as_C_string(resolved_klass(),
930 resolved_method->name(),
931 resolved_method->signature()));
932 }
933 }
934 }
935
936 // check if not static
937 if (sel_method->is_static()) {
938 ResourceMark rm(THREAD);
939 char buf[200];
940 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
941 resolved_method->name(),
942 resolved_method->signature()));
943 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
944 }
945
946 // check if abstract
947 if (sel_method->is_abstract()) {
948 ResourceMark rm(THREAD);
949 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
950 Method::name_and_sig_as_C_string(resolved_klass(),
951 sel_method->name(),
952 sel_method->signature()));
953 }
954
955 if (TraceItables && Verbose) {
956 ResourceMark rm(THREAD);
957 tty->print("invokespecial selected method: resolved-class:%s, method:%s, method_holder:%s, access_flags: ",
958 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
959 Method::name_and_sig_as_C_string(resolved_klass(),
960 sel_method->name(),
961 sel_method->signature()),
962 sel_method->method_holder()->internal_name()
963 );
964 sel_method->access_flags().print_on(tty);
965 if (sel_method->method_holder()->is_interface() &&
966 !sel_method->is_abstract()) {
967 tty->print("default");
968 }
969 tty->cr();
970 }
971
972 // setup result
973 result.set_static(resolved_klass, sel_method, CHECK);
974 }
975
976 void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass, KlassHandle resolved_klass,
977 Symbol* method_name, Symbol* method_signature, KlassHandle current_klass,
978 bool check_access, bool check_null_and_abstract, TRAPS) {
979 methodHandle resolved_method;
980 linktime_resolve_virtual_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
981 runtime_resolve_virtual_method(result, resolved_method, resolved_klass, recv, receiver_klass, check_null_and_abstract, CHECK);
982 }
983
984 // throws linktime exceptions
985 void LinkResolver::linktime_resolve_virtual_method(methodHandle &resolved_method, KlassHandle resolved_klass,
986 Symbol* method_name, Symbol* method_signature,
987 KlassHandle current_klass, bool check_access, TRAPS) {
988 // normal method resolution
989 resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
990
991 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
992 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
993
994 // check if private interface method
995 if (resolved_klass->is_interface() && resolved_method->is_private()) {
996 ResourceMark rm(THREAD);
997 char buf[200];
998 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
999 Method::name_and_sig_as_C_string(resolved_klass(),
1000 resolved_method->name(),
1001 resolved_method->signature()),
1002 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
1003 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1004 }
1005
1006 // check if not static
1007 if (resolved_method->is_static()) {
1008 ResourceMark rm(THREAD);
1009 char buf[200];
1010 jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
1011 resolved_method->name(),
1012 resolved_method->signature()));
1013 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1014 }
1015
1016 if (PrintVtables && Verbose) {
1017 ResourceMark rm(THREAD);
1018 tty->print("invokevirtual resolved method: caller-class:%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
1019 (current_klass.is_null() ? "<NULL>" : current_klass->internal_name()),
1020 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
1021 Method::name_and_sig_as_C_string(resolved_klass(),
1022 resolved_method->name(),
1023 resolved_method->signature()),
1024 resolved_method->method_holder()->internal_name()
1025 );
1026 resolved_method->access_flags().print_on(tty);
1027 if (resolved_method->method_holder()->is_interface() &&
1028 !resolved_method->is_abstract()) {
1029 tty->print("default");
1030 }
1031 if (resolved_method->is_overpass()) {
1032 tty->print("overpass");
1033 }
1034 tty->cr();
1035 }
1036 }
1037
1038 // throws runtime exceptions
1039 void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
1040 methodHandle resolved_method,
1041 KlassHandle resolved_klass,
1042 Handle recv,
1043 KlassHandle recv_klass,
1044 bool check_null_and_abstract,
1045 TRAPS) {
1046
1047 // setup default return values
1048 int vtable_index = Method::invalid_vtable_index;
1049 methodHandle selected_method;
1050
1051 assert(recv.is_null() || recv->is_oop(), "receiver is not an oop");
1052
1053 // runtime method resolution
1054 if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
1055 THROW(vmSymbols::java_lang_NullPointerException());
1056 }
1057
1058 // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
1059 // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
1060 // a missing receiver might result in a bogus lookup.
1061 assert(resolved_method->method_holder()->is_linked(), "must be linked");
1062
1063 // do lookup based on receiver klass using the vtable index
1064 if (resolved_method->method_holder()->is_interface()) { // miranda method
1065 vtable_index = vtable_index_of_miranda_method(resolved_klass,
1066 resolved_method->name(),
1067 resolved_method->signature(), CHECK);
1068
1069 assert(vtable_index >= 0 , "we should have valid vtable index at this point");
1070
1071 InstanceKlass* inst = InstanceKlass::cast(recv_klass());
1072 selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
1073 } else {
1074 // at this point we are sure that resolved_method is virtual and not
1075 // a miranda method; therefore, it must have a valid vtable index.
1076 assert(!resolved_method->has_itable_index(), "");
1077 vtable_index = resolved_method->vtable_index();
1078 // We could get a negative vtable_index for final methods,
1079 // because as an optimization they are they are never put in the vtable,
1080 // unless they override an existing method.
1081 // If we do get a negative, it means the resolved method is the the selected
1082 // method, and it can never be changed by an override.
1083 if (vtable_index == Method::nonvirtual_vtable_index) {
1084 assert(resolved_method->can_be_statically_bound(), "cannot override this method");
1085 selected_method = resolved_method;
1086 } else {
1087 // recv_klass might be an arrayKlassOop but all vtables start at
1088 // the same place. The cast is to avoid virtual call and assertion.
1089 InstanceKlass* inst = (InstanceKlass*)recv_klass();
1090 selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
1091 }
1092 }
1093
1094 // check if method exists
1095 if (selected_method.is_null()) {
1096 ResourceMark rm(THREAD);
1097 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1098 Method::name_and_sig_as_C_string(resolved_klass(),
1099 resolved_method->name(),
1100 resolved_method->signature()));
1101 }
1102
1103 // check if abstract
1104 if (check_null_and_abstract && selected_method->is_abstract()) {
1105 ResourceMark rm(THREAD);
1106 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1107 Method::name_and_sig_as_C_string(resolved_klass(),
1108 selected_method->name(),
1109 selected_method->signature()));
1110 }
1111
1112 if (PrintVtables && Verbose) {
1113 ResourceMark rm(THREAD);
1114 tty->print("invokevirtual selected method: receiver-class:%s, resolved-class:%s, method:%s, method_holder:%s, vtable_index:%d, access_flags: ",
1115 (recv_klass.is_null() ? "<NULL>" : recv_klass->internal_name()),
1116 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
1117 Method::name_and_sig_as_C_string(resolved_klass(),
1118 resolved_method->name(),
1119 resolved_method->signature()),
1120 selected_method->method_holder()->internal_name(),
1121 vtable_index
1122 );
1123 selected_method->access_flags().print_on(tty);
1124 if (selected_method->method_holder()->is_interface() &&
1125 !selected_method->is_abstract()) {
1126 tty->print("default");
1127 }
1128 if (resolved_method->is_overpass()) {
1129 tty->print("overpass");
1130 }
1131 tty->cr();
1132 }
1133 // setup result
1134 result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
1135 }
1136
1137 void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass, KlassHandle resolved_klass,
1138 Symbol* method_name, Symbol* method_signature, KlassHandle current_klass,
1139 bool check_access, bool check_null_and_abstract, TRAPS) {
1140 methodHandle resolved_method;
1141 linktime_resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
1142 runtime_resolve_interface_method(result, resolved_method, resolved_klass, recv, recv_klass, check_null_and_abstract, CHECK);
1143 }
1144
1145 // throws linktime exceptions
1146 void LinkResolver::linktime_resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name,
1147 Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) {
1148 // normal interface method resolution
1149 resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
1150
1151 assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
1152 assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
1153 }
1154
1155 // throws runtime exceptions
1156 void LinkResolver::runtime_resolve_interface_method(CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass,
1157 Handle recv, KlassHandle recv_klass, bool check_null_and_abstract, TRAPS) {
1158 // check if receiver exists
1159 if (check_null_and_abstract && recv.is_null()) {
1160 THROW(vmSymbols::java_lang_NullPointerException());
1161 }
1162
1163 // check if private interface method
1164 if (resolved_klass->is_interface() && resolved_method->is_private()) {
1165 ResourceMark rm(THREAD);
1166 char buf[200];
1167 jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s",
1168 Method::name_and_sig_as_C_string(resolved_klass(),
1169 resolved_method->name(),
1170 resolved_method->signature()));
1171 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1172 }
1173
1174 // check if receiver klass implements the resolved interface
1175 if (!recv_klass->is_subtype_of(resolved_klass())) {
1176 ResourceMark rm(THREAD);
1177 char buf[200];
1178 jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
1179 recv_klass()->external_name(),
1180 resolved_klass()->external_name());
1181 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1182 }
1183 // do lookup based on receiver klass
1184 methodHandle sel_method;
1185 lookup_instance_method_in_klasses(sel_method, recv_klass,
1186 resolved_method->name(),
1187 resolved_method->signature(), CHECK);
1188 if (sel_method.is_null() && !check_null_and_abstract) {
1189 // In theory this is a harmless placeholder value, but
1190 // in practice leaving in null affects the nsk default method tests.
1191 // This needs further study.
1192 sel_method = resolved_method;
1193 }
1194 // check if method exists
1195 if (sel_method.is_null()) {
1196 ResourceMark rm(THREAD);
1197 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1198 Method::name_and_sig_as_C_string(recv_klass(),
1199 resolved_method->name(),
1200 resolved_method->signature()));
1201 }
1202 // check access
1203 // Throw Illegal Access Error if sel_method is not public.
1204 if (!sel_method->is_public()) {
1205 ResourceMark rm(THREAD);
1206 THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
1207 Method::name_and_sig_as_C_string(recv_klass(),
1208 sel_method->name(),
1209 sel_method->signature()));
1210 }
1211
1212 // check if abstract
1213 if (check_null_and_abstract && sel_method->is_abstract()) {
1214 ResourceMark rm(THREAD);
1215 THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
1216 Method::name_and_sig_as_C_string(recv_klass(),
1217 sel_method->name(),
1218 sel_method->signature()));
1219 }
1220 // setup result
1221 if (!resolved_method->has_itable_index()) {
1222 int vtable_index = resolved_method->vtable_index();
1223 assert(vtable_index == sel_method->vtable_index(), "sanity check");
1224 result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK);
1225 return;
1226 }
1227 int itable_index = resolved_method()->itable_index();
1228
1229 if (TraceItables && Verbose) {
1230 ResourceMark rm(THREAD);
1231 tty->print("invokeinterface selected method: receiver-class:%s, resolved-class:%s, method:%s, method_holder:%s, access_flags: ",
1232 (recv_klass.is_null() ? "<NULL>" : recv_klass->internal_name()),
1233 (resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
1234 Method::name_and_sig_as_C_string(resolved_klass(),
1235 resolved_method->name(),
1236 resolved_method->signature()),
1237 sel_method->method_holder()->internal_name()
1238 );
1239 sel_method->access_flags().print_on(tty);
1240 if (sel_method->method_holder()->is_interface() &&
1241 !sel_method->is_abstract()) {
1242 tty->print("default");
1243 }
1244 if (resolved_method->is_overpass()) {
1245 tty->print("overpass");
1246 }
1247 tty->cr();
1248 }
1249 result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK);
1250 }
1251
1252
1253 methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
1254 KlassHandle resolved_klass,
1255 Symbol* method_name,
1256 Symbol* method_signature,
1257 KlassHandle current_klass,
1258 bool check_access) {
1259 EXCEPTION_MARK;
1260 methodHandle method_result;
1261 linktime_resolve_interface_method(method_result, resolved_klass, method_name, method_signature, current_klass, check_access, THREAD);
1262 if (HAS_PENDING_EXCEPTION) {
1263 CLEAR_PENDING_EXCEPTION;
1264 return methodHandle();
1265 } else {
1266 return method_result;
1267 }
1268 }
1269
1270 methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
1271 KlassHandle resolved_klass,
1272 Symbol* method_name,
1273 Symbol* method_signature,
1274 KlassHandle current_klass,
1275 bool check_access) {
1276 EXCEPTION_MARK;
1277 methodHandle method_result;
1278 linktime_resolve_virtual_method(method_result, resolved_klass, method_name, method_signature, current_klass, check_access, THREAD);
1279 if (HAS_PENDING_EXCEPTION) {
1280 CLEAR_PENDING_EXCEPTION;
1281 return methodHandle();
1282 } else {
1283 return method_result;
1284 }
1285 }
1286
1287 methodHandle LinkResolver::resolve_virtual_call_or_null(
1288 KlassHandle receiver_klass,
1289 KlassHandle resolved_klass,
1290 Symbol* name,
1291 Symbol* signature,
1292 KlassHandle current_klass) {
1293 EXCEPTION_MARK;
1294 CallInfo info;
1295 resolve_virtual_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, true, false, THREAD);
1296 if (HAS_PENDING_EXCEPTION) {
1297 CLEAR_PENDING_EXCEPTION;
1298 return methodHandle();
1299 }
1300 return info.selected_method();
1301 }
1302
1303 methodHandle LinkResolver::resolve_interface_call_or_null(
1304 KlassHandle receiver_klass,
1305 KlassHandle resolved_klass,
1306 Symbol* name,
1307 Symbol* signature,
1308 KlassHandle current_klass) {
1309 EXCEPTION_MARK;
1310 CallInfo info;
1311 resolve_interface_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, true, false, THREAD);
1312 if (HAS_PENDING_EXCEPTION) {
1313 CLEAR_PENDING_EXCEPTION;
1314 return methodHandle();
1315 }
1316 return info.selected_method();
1317 }
1318
1319 int LinkResolver::resolve_virtual_vtable_index(
1320 KlassHandle receiver_klass,
1321 KlassHandle resolved_klass,
1322 Symbol* name,
1323 Symbol* signature,
1324 KlassHandle current_klass) {
1325 EXCEPTION_MARK;
1326 CallInfo info;
1327 resolve_virtual_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, true, false, THREAD);
1328 if (HAS_PENDING_EXCEPTION) {
1329 CLEAR_PENDING_EXCEPTION;
1330 return Method::invalid_vtable_index;
1331 }
1332 return info.vtable_index();
1333 }
1334
1335 methodHandle LinkResolver::resolve_static_call_or_null(
1336 KlassHandle resolved_klass,
1337 Symbol* name,
1338 Symbol* signature,
1339 KlassHandle current_klass) {
1340 EXCEPTION_MARK;
1341 CallInfo info;
1342 resolve_static_call(info, resolved_klass, name, signature, current_klass, true, false, THREAD);
1343 if (HAS_PENDING_EXCEPTION) {
1344 CLEAR_PENDING_EXCEPTION;
1345 return methodHandle();
1346 }
1347 return info.selected_method();
1348 }
1349
1350 methodHandle LinkResolver::resolve_special_call_or_null(KlassHandle resolved_klass, Symbol* name, Symbol* signature,
1351 KlassHandle current_klass) {
1352 EXCEPTION_MARK;
1353 CallInfo info;
1354 resolve_special_call(info, resolved_klass, name, signature, current_klass, true, THREAD);
1355 if (HAS_PENDING_EXCEPTION) {
1356 CLEAR_PENDING_EXCEPTION;
1357 return methodHandle();
1358 }
1359 return info.selected_method();
1360 }
1361
1362
1363
1364 //------------------------------------------------------------------------------------------------------------------------
1365 // ConstantPool entries
1366
1367 void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS) {
1368 switch (byte) {
1369 case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
1370 case Bytecodes::_invokespecial : resolve_invokespecial (result, pool, index, CHECK); break;
1371 case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
1372 case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
1373 case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
1374 case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
1375 }
1376 return;
1377 }
1378
1379 void LinkResolver::resolve_pool(KlassHandle& resolved_klass, Symbol*& method_name, Symbol*& method_signature,
1380 KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS) {
1381 // resolve klass
1382 resolve_klass(resolved_klass, pool, index, CHECK);
1383
1384 // Get name, signature, and static klass
1385 method_name = pool->name_ref_at(index);
1386 method_signature = pool->signature_ref_at(index);
1387 current_klass = KlassHandle(THREAD, pool->pool_holder());
1388 }
1389
1390
1391 void LinkResolver::resolve_invokestatic(CallInfo& result, constantPoolHandle pool, int index, TRAPS) {
1392 KlassHandle resolved_klass;
1393 Symbol* method_name = NULL;
1394 Symbol* method_signature = NULL;
1395 KlassHandle current_klass;
1396 resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK);
1397 resolve_static_call(result, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK);
1398 }
1399
1400
1401 void LinkResolver::resolve_invokespecial(CallInfo& result, constantPoolHandle pool, int index, TRAPS) {
1402 KlassHandle resolved_klass;
1403 Symbol* method_name = NULL;
1404 Symbol* method_signature = NULL;
1405 KlassHandle current_klass;
1406 resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK);
1407 resolve_special_call(result, resolved_klass, method_name, method_signature, current_klass, true, CHECK);
1408 }
1409
1410
1411 void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
1412 constantPoolHandle pool, int index,
1413 TRAPS) {
1414
1415 KlassHandle resolved_klass;
1416 Symbol* method_name = NULL;
1417 Symbol* method_signature = NULL;
1418 KlassHandle current_klass;
1419 resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK);
1420 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1421 resolve_virtual_call(result, recv, recvrKlass, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK);
1422 }
1423
1424
1425 void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS) {
1426 KlassHandle resolved_klass;
1427 Symbol* method_name = NULL;
1428 Symbol* method_signature = NULL;
1429 KlassHandle current_klass;
1430 resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK);
1431 KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
1432 resolve_interface_call(result, recv, recvrKlass, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK);
1433 }
1434
1435
1436 void LinkResolver::resolve_invokehandle(CallInfo& result, constantPoolHandle pool, int index, TRAPS) {
1437 assert(EnableInvokeDynamic, "");
1438 // This guy is reached from InterpreterRuntime::resolve_invokehandle.
1439 KlassHandle resolved_klass;
1440 Symbol* method_name = NULL;
1441 Symbol* method_signature = NULL;
1442 KlassHandle current_klass;
1443 resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK);
1444 if (TraceMethodHandles) {
1445 ResourceMark rm(THREAD);
1446 tty->print_cr("resolve_invokehandle %s %s", method_name->as_C_string(), method_signature->as_C_string());
1447 }
1448 resolve_handle_call(result, resolved_klass, method_name, method_signature, current_klass, CHECK);
1449 }
1450
1451 void LinkResolver::resolve_handle_call(CallInfo& result, KlassHandle resolved_klass,
1452 Symbol* method_name, Symbol* method_signature,
1453 KlassHandle current_klass,
1454 TRAPS) {
1455 // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
1456 assert(resolved_klass() == SystemDictionary::MethodHandle_klass(), "");
1457 assert(MethodHandles::is_signature_polymorphic_name(method_name), "");
1458 methodHandle resolved_method;
1459 Handle resolved_appendix;
1460 Handle resolved_method_type;
1461 lookup_polymorphic_method(resolved_method, resolved_klass,
1462 method_name, method_signature,
1463 current_klass, &resolved_appendix, &resolved_method_type, CHECK);
1464 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, CHECK);
1465 }
1466
1467
1468 void LinkResolver::resolve_invokedynamic(CallInfo& result, constantPoolHandle pool, int index, TRAPS) {
1469 assert(EnableInvokeDynamic, "");
1470
1471 //resolve_pool(<resolved_klass>, method_name, method_signature, current_klass, pool, index, CHECK);
1472 Symbol* method_name = pool->name_ref_at(index);
1473 Symbol* method_signature = pool->signature_ref_at(index);
1474 KlassHandle current_klass = KlassHandle(THREAD, pool->pool_holder());
1475
1476 // Resolve the bootstrap specifier (BSM + optional arguments).
1477 Handle bootstrap_specifier;
1478 // Check if CallSite has been bound already:
1479 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1480 if (cpce->is_f1_null()) {
1481 int pool_index = cpce->constant_pool_index();
1482 oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, CHECK);
1483 assert(bsm_info != NULL, "");
1484 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
1485 bootstrap_specifier = Handle(THREAD, bsm_info);
1486 }
1487 if (!cpce->is_f1_null()) {
1488 methodHandle method( THREAD, cpce->f1_as_method());
1489 Handle appendix( THREAD, cpce->appendix_if_resolved(pool));
1490 Handle method_type(THREAD, cpce->method_type_if_resolved(pool));
1491 result.set_handle(method, appendix, method_type, CHECK);
1492 return;
1493 }
1494
1495 if (TraceMethodHandles) {
1496 ResourceMark rm(THREAD);
1497 tty->print_cr("resolve_invokedynamic #%d %s %s",
1498 ConstantPool::decode_invokedynamic_index(index),
1499 method_name->as_C_string(), method_signature->as_C_string());
1500 tty->print(" BSM info: "); bootstrap_specifier->print();
1501 }
1502
1503 resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK);
1504 }
1505
1506 void LinkResolver::resolve_dynamic_call(CallInfo& result,
1507 Handle bootstrap_specifier,
1508 Symbol* method_name, Symbol* method_signature,
1509 KlassHandle current_klass,
1510 TRAPS) {
1511 // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...)
1512 // The appendix argument is likely to be a freshly-created CallSite.
1513 Handle resolved_appendix;
1514 Handle resolved_method_type;
1515 methodHandle resolved_method =
1516 SystemDictionary::find_dynamic_call_site_invoker(current_klass,
1517 bootstrap_specifier,
1518 method_name, method_signature,
1519 &resolved_appendix,
1520 &resolved_method_type,
1521 THREAD);
1522 if (HAS_PENDING_EXCEPTION) {
1523 if (TraceMethodHandles) {
1524 tty->print_cr("invokedynamic throws BSME for "INTPTR_FORMAT, (void *)PENDING_EXCEPTION);
1525 PENDING_EXCEPTION->print();
1526 }
1527 if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) {
1528 // throw these guys, since they are already wrapped
1529 return;
1530 }
1531 if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1532 // intercept only LinkageErrors which might have failed to wrap
1533 return;
1534 }
1535 // See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS.
1536 Handle nested_exception(THREAD, PENDING_EXCEPTION);
1537 CLEAR_PENDING_EXCEPTION;
1538 THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception)
1539 }
1540 result.set_handle(resolved_method, resolved_appendix, resolved_method_type, CHECK);
1541 }
1542
1543 //------------------------------------------------------------------------------------------------------------------------
1544 #ifndef PRODUCT
1545
1546 void CallInfo::print() {
1547 ResourceMark rm;
1548 const char* kindstr = "unknown";
1549 switch (_call_kind) {
1550 case direct_call: kindstr = "direct"; break;
1551 case vtable_call: kindstr = "vtable"; break;
1552 case itable_call: kindstr = "itable"; break;
1553 }
1554 tty->print_cr("Call %s@%d %s", kindstr, _call_index,
1555 _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
1556 }
1557
1558 #endif