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