1 /*
2 * Copyright (c) 2008, 2020, 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/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "code/codeCache.hpp"
30 #include "code/dependencyContext.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "interpreter/oopMapCache.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "memory/universe.hpp"
39 #include "oops/objArrayKlass.hpp"
40 #include "oops/objArrayOop.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "oops/typeArrayOop.inline.hpp"
43 #include "prims/methodHandles.hpp"
44 #include "runtime/deoptimization.hpp"
45 #include "runtime/fieldDescriptor.inline.hpp"
46 #include "runtime/handles.inline.hpp"
47 #include "runtime/interfaceSupport.inline.hpp"
48 #include "runtime/javaCalls.hpp"
49 #include "runtime/jniHandles.inline.hpp"
50 #include "runtime/timerTrace.hpp"
51 #include "runtime/reflection.hpp"
52 #include "runtime/safepointVerifiers.hpp"
53 #include "runtime/signature.hpp"
54 #include "runtime/stubRoutines.hpp"
55 #include "utilities/exceptions.hpp"
56
57
58 /*
59 * JSR 292 reference implementation: method handles
60 * The JDK 7 reference implementation represented method handle
61 * combinations as chains. Each link in the chain had a "vmentry"
62 * field which pointed at a bit of assembly code which performed
63 * one transformation before dispatching to the next link in the chain.
64 *
65 * The current reference implementation pushes almost all code generation
66 * responsibility to (trusted) Java code. A method handle contains a
67 * pointer to its "LambdaForm", which embodies all details of the method
68 * handle's behavior. The LambdaForm is a normal Java object, managed
69 * by a runtime coded in Java.
70 */
71
72 bool MethodHandles::_enabled = false; // set true after successful native linkage
73 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
74
75 /**
76 * Generates method handle adapters. Returns 'false' if memory allocation
77 * failed and true otherwise.
78 */
79 void MethodHandles::generate_adapters() {
80 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
81 assert(_adapter_code == NULL, "generate only once");
82
83 ResourceMark rm;
84 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
85 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
86 CodeBuffer code(_adapter_code);
87 MethodHandlesAdapterGenerator g(&code);
88 g.generate();
89 code.log_section_sizes("MethodHandlesAdapterBlob");
90 }
91
92 //------------------------------------------------------------------------------
93 // MethodHandlesAdapterGenerator::generate
94 //
95 void MethodHandlesAdapterGenerator::generate() {
96 // Generate generic method handle adapters.
97 // Generate interpreter entries
98 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
99 mk <= Interpreter::method_handle_invoke_LAST;
100 mk = Interpreter::MethodKind(1 + (int)mk)) {
101 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
102 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
103 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
104 if (entry != NULL) {
105 Interpreter::set_entry_for_kind(mk, entry);
106 }
107 // If the entry is not set, it will throw AbstractMethodError.
108 }
109 }
110
111 void MethodHandles::set_enabled(bool z) {
112 if (_enabled != z) {
113 guarantee(z, "can only enable once");
114 _enabled = z;
115 }
116 }
117
118 // MemberName support
119
120 // import java_lang_invoke_MemberName.*
121 enum {
122 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
123 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
124 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
125 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
126 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
127 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
128 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
129 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
130 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
131 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
132 };
133
134 int MethodHandles::ref_kind_to_flags(int ref_kind) {
135 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
136 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
137 if (ref_kind_is_field(ref_kind)) {
138 flags |= IS_FIELD;
139 } else if (ref_kind_is_method(ref_kind)) {
140 flags |= IS_METHOD;
141 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
142 flags |= IS_CONSTRUCTOR;
143 }
144 return flags;
145 }
146
147 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
148 Handle empty;
149 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
150 if (!java_lang_String::is_instance_inlined(type())) {
151 return type; // already resolved
152 }
153 Symbol* signature = java_lang_String::as_symbol_or_null(type());
154 if (signature == NULL) {
155 return empty; // no such signature exists in the VM
156 }
157 Handle resolved;
158 int flags = java_lang_invoke_MemberName::flags(mname());
159 switch (flags & ALL_KINDS) {
160 case IS_METHOD:
161 case IS_CONSTRUCTOR:
162 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
163 break;
164 case IS_FIELD:
165 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
166 break;
167 default:
168 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
169 }
170 if (resolved.is_null()) {
171 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
172 }
173 return resolved;
174 }
175
176 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
177 // This method is used from java.lang.invoke.MemberName constructors.
178 // It fills in the new MemberName from a java.lang.reflect.Member.
179 Thread* thread = Thread::current();
180 oop target_oop = target();
181 Klass* target_klass = target_oop->klass();
182 if (target_klass == SystemDictionary::reflect_Field_klass()) {
183 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
184 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
185 Klass* k = java_lang_Class::as_Klass(clazz);
186 if (k != NULL && k->is_instance_klass()) {
187 fieldDescriptor fd(InstanceKlass::cast(k), slot);
188 oop mname2 = init_field_MemberName(mname, fd);
189 if (mname2 != NULL) {
190 // Since we have the reified name and type handy, add them to the result.
191 if (java_lang_invoke_MemberName::name(mname2) == NULL)
192 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
193 if (java_lang_invoke_MemberName::type(mname2) == NULL)
194 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
195 }
196 return mname2;
197 }
198 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
199 oop clazz = java_lang_reflect_Method::clazz(target_oop);
200 int slot = java_lang_reflect_Method::slot(target_oop);
201 Klass* k = java_lang_Class::as_Klass(clazz);
202 if (k != NULL && k->is_instance_klass()) {
203 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
204 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
205 return NULL; // do not resolve unless there is a concrete signature
206 CallInfo info(m, k, CHECK_NULL);
207 return init_method_MemberName(mname, info);
208 }
209 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
210 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
211 int slot = java_lang_reflect_Constructor::slot(target_oop);
212 Klass* k = java_lang_Class::as_Klass(clazz);
213 if (k != NULL && k->is_instance_klass()) {
214 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
215 if (m == NULL) return NULL;
216 CallInfo info(m, k, CHECK_NULL);
217 return init_method_MemberName(mname, info);
218 }
219 }
220 return NULL;
221 }
222
223 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
224 assert(info.resolved_appendix().is_null(), "only normal methods here");
225 methodHandle m(Thread::current(), info.resolved_method());
226 assert(m.not_null(), "null method handle");
227 InstanceKlass* m_klass = m->method_holder();
228 assert(m_klass != NULL, "null holder for method handle");
229 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
230 int vmindex = Method::invalid_vtable_index;
231
232 switch (info.call_kind()) {
233 case CallInfo::itable_call:
234 vmindex = info.itable_index();
235 // More importantly, the itable index only works with the method holder.
236 assert(m_klass->verify_itable_index(vmindex), "");
237 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
238 if (TraceInvokeDynamic) {
239 ttyLocker ttyl;
240 ResourceMark rm;
241 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
242 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
243 vmindex);
244 m->access_flags().print_on(tty);
245 if (!m->is_abstract()) {
246 if (!m->is_private()) {
247 tty->print("default");
248 }
249 else {
250 tty->print("private-intf");
251 }
252 }
253 tty->cr();
254 }
255 break;
256
257 case CallInfo::vtable_call:
258 vmindex = info.vtable_index();
259 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
260 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
261 if (m_klass->is_interface()) {
262 // This is a vtable call to an interface method (abstract "miranda method" or default method).
263 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
264 // (LinkResolver should help us figure this out.)
265 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass");
266 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass());
267 if (m_klass_non_interface->is_interface()) {
268 m_klass_non_interface = SystemDictionary::Object_klass();
269 #ifdef ASSERT
270 { ResourceMark rm;
271 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
272 assert(m->name() == m2->name() && m->signature() == m2->signature(),
273 "at %d, %s != %s", vmindex,
274 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
275 }
276 #endif //ASSERT
277 }
278 if (!m->is_public()) {
279 assert(m->is_public(), "virtual call must be to public interface method");
280 return NULL; // elicit an error later in product build
281 }
282 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
283 m_klass = m_klass_non_interface;
284 }
285 if (TraceInvokeDynamic) {
286 ttyLocker ttyl;
287 ResourceMark rm;
288 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
289 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
290 m_klass->internal_name(), vmindex);
291 m->access_flags().print_on(tty);
292 if (m->is_default_method()) {
293 tty->print("default");
294 }
295 tty->cr();
296 }
297 break;
298
299 case CallInfo::direct_call:
300 vmindex = Method::nonvirtual_vtable_index;
301 if (m->is_static()) {
302 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
303 } else if (m->is_initializer()) {
304 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
305 } else {
306 // "special" reflects that this is a direct call, not that it
307 // necessarily originates from an invokespecial. We can also do
308 // direct calls for private and/or final non-static methods.
309 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
310 }
311 break;
312
313 default: assert(false, "bad CallInfo"); return NULL;
314 }
315
316 // @CallerSensitive annotation detected
317 if (m->caller_sensitive()) {
318 flags |= CALLER_SENSITIVE;
319 }
320
321 Handle resolved_method = info.resolved_method_name();
322 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(),
323 "Should not change after link resolution");
324
325 oop mname_oop = mname();
326 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
327 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
328 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
329 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
330 // Note: name and type can be lazily computed by resolve_MemberName,
331 // if Java code needs them as resolved String and MethodType objects.
332 // If relevant, the vtable or itable value is stored as vmindex.
333 // This is done eagerly, since it is readily available without
334 // constructing any new objects.
335 return mname();
336 }
337
338 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
339 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
340 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
341 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
342 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
343
344 oop mname_oop = mname();
345 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
346 java_lang_invoke_MemberName::set_method (mname_oop, NULL);
347 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
348 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror());
349
350 oop type = field_signature_type_or_null(fd.signature());
351 oop name = field_name_or_null(fd.name());
352 if (name != NULL)
353 java_lang_invoke_MemberName::set_name(mname_oop, name);
354 if (type != NULL)
355 java_lang_invoke_MemberName::set_type(mname_oop, type);
356 // Note: name and type can be lazily computed by resolve_MemberName,
357 // if Java code needs them as resolved String and Class objects.
358 // Note that the incoming type oop might be pre-resolved (non-null).
359 // The base clazz and field offset (vmindex) must be eagerly stored,
360 // because they unambiguously identify the field.
361 // Although the fieldDescriptor::_index would also identify the field,
362 // we do not use it, because it is harder to decode.
363 // TO DO: maybe intern mname_oop
364 return mname();
365 }
366
367 // JVM 2.9 Special Methods:
368 // A method is signature polymorphic if and only if all of the following conditions hold :
369 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
370 // * It has a single formal parameter of type Object[].
371 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
372 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
373 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
374 if (klass == NULL)
375 return false;
376 // The following test will fail spuriously during bootstrap of MethodHandle itself:
377 // if (klass != SystemDictionary::MethodHandle_klass())
378 // Test the name instead:
379 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
380 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
381 return false;
382 }
383
384 // Look up signature polymorphic method with polymorphic return type
385 Symbol* poly_sig = vmSymbols::object_array_object_signature();
386 InstanceKlass* iklass = InstanceKlass::cast(klass);
387 Method* m = iklass->find_method(name, poly_sig);
388 if (m != NULL) {
389 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
390 int flags = m->access_flags().as_int();
391 if ((flags & required) == required) {
392 return true;
393 }
394 }
395
396 // Look up signature polymorphic method with non-polymorphic (non Object) return type
397 int me;
398 int ms = iklass->find_method_by_name(name, &me);
399 if (ms == -1) return false;
400 for (; ms < me; ms++) {
401 Method* m = iklass->methods()->at(ms);
402 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
403 int flags = m->access_flags().as_int();
404 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
405 return true;
406 }
407 }
408 return false;
409 }
410
411
412 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
413 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
414 switch (iid) {
415 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
416 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
417 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
418 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
419 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
420 default:
421 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
422 return 0;
423 }
424 }
425
426 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
427 switch(id) {
428 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
429 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
430 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
431 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
432 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
433 default:
434 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
435 return Bytecodes::_illegal;
436 }
437 }
438
439 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
440 switch (iid) {
441 case vmIntrinsics::_invokeBasic: return 0;
442 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
443 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
444 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
445 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
446 default:
447 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
448 return 0;
449 }
450 }
451
452 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
453 vmSymbols::SID name_id = vmSymbols::find_sid(name);
454 switch (name_id) {
455 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
456 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
457 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
458 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
459
460 // There is one static signature-polymorphic method for each JVM invocation mode.
461 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
462 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
463 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
464 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
465 default: break;
466 }
467
468 // Cover the case of invokeExact and any future variants of invokeFoo.
469 Klass* mh_klass = SystemDictionary::well_known_klass(
470 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
471 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
472 return vmIntrinsics::_invokeGeneric;
473 }
474
475 // Cover the case of methods on VarHandle.
476 Klass* vh_klass = SystemDictionary::well_known_klass(
477 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) );
478 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
479 return vmIntrinsics::_invokeGeneric;
480 }
481
482 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
483 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
484 return vmIntrinsics::_none;
485 }
486
487 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
488 if (klass != NULL &&
489 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
490 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
491 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
492 if (iid != vmIntrinsics::_none)
493 return iid;
494 if (is_method_handle_invoke_name(klass, name))
495 return vmIntrinsics::_invokeGeneric;
496 }
497 return vmIntrinsics::_none;
498 }
499
500 // Returns true if method is signature polymorphic and public
501 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
502 if (is_signature_polymorphic_name(klass, name)) {
503 InstanceKlass* iklass = InstanceKlass::cast(klass);
504 int me;
505 int ms = iklass->find_method_by_name(name, &me);
506 assert(ms != -1, "");
507 for (; ms < me; ms++) {
508 Method* m = iklass->methods()->at(ms);
509 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
510 int flags = m->access_flags().as_int();
511 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
512 return true;
513 }
514 }
515 }
516 return false;
517 }
518
519 // convert the external string or reflective type to an internal signature
520 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
521 if (java_lang_invoke_MethodType::is_instance(type_str)) {
522 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
523 } else if (java_lang_Class::is_instance(type_str)) {
524 return java_lang_Class::as_signature(type_str, false);
525 } else if (java_lang_String::is_instance_inlined(type_str)) {
526 if (intern_if_not_found) {
527 return java_lang_String::as_symbol(type_str);
528 } else {
529 return java_lang_String::as_symbol_or_null(type_str);
530 }
531 } else {
532 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
533 }
534 }
535
536 static const char OBJ_SIG[] = "Ljava/lang/Object;";
537 enum { OBJ_SIG_LEN = 18 };
538
539 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
540 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
541 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
542 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) {
543 switch (ss.type()) {
544 case T_OBJECT:
545 // only java/lang/Object is valid here
546 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, OBJ_SIG_LEN) != 0)
547 return false;
548 break;
549 case T_VOID:
550 case T_INT: case T_LONG: case T_FLOAT: case T_DOUBLE:
551 break;
552 default:
553 // subword types (T_BYTE etc.), Q-descriptors, arrays
554 return false;
555 }
556 }
557 return true;
558 }
559
560 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
561 Symbol* bsig = NULL;
562 if (sig == NULL) {
563 return sig;
564 } else if (is_basic_type_signature(sig)) {
565 sig->increment_refcount();
566 return sig; // that was easy
567 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) {
568 BasicType bt = Signature::basic_type(sig);
569 if (is_subword_type(bt)) {
570 bsig = vmSymbols::int_signature();
571 } else {
572 assert(is_reference_type(bt), "is_basic_type_signature was false");
573 bsig = vmSymbols::object_signature();
574 }
575 } else {
576 ResourceMark rm;
577 stringStream buffer(128);
578 buffer.put(JVM_SIGNATURE_FUNC);
579 int arg_pos = 0, keep_arg_pos = -1;
580 if (keep_last_arg)
581 keep_arg_pos = ArgumentCount(sig).size() - 1;
582 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
583 BasicType bt = ss.type();
584 size_t this_arg_pos = buffer.size();
585 if (ss.at_return_type()) {
586 buffer.put(JVM_SIGNATURE_ENDFUNC);
587 }
588 if (arg_pos == keep_arg_pos) {
589 buffer.write((char*) ss.raw_bytes(),
590 (int) ss.raw_length());
591 } else if (is_reference_type(bt)) {
592 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
593 } else {
594 if (is_subword_type(bt))
595 bt = T_INT;
596 buffer.put(type2char(bt));
597 }
598 arg_pos++;
599 }
600 const char* sigstr = buffer.base();
601 int siglen = (int) buffer.size();
602 bsig = SymbolTable::new_symbol(sigstr, siglen);
603 }
604 assert(is_basic_type_signature(bsig) ||
605 // detune assert in case the injected argument is not a basic type:
606 keep_last_arg, "");
607 return bsig;
608 }
609
610 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
611 Symbol* sig) {
612 st = st ? st : tty;
613 bool prev_type = false;
614 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC);
615 if (is_method) st->put(JVM_SIGNATURE_FUNC);
616 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
617 if (ss.at_return_type())
618 st->put(JVM_SIGNATURE_ENDFUNC);
619 else if (prev_type)
620 st->put(',');
621 const char* cp = (const char*) ss.raw_bytes();
622 if (ss.is_array()) {
623 st->put(JVM_SIGNATURE_ARRAY);
624 if (ss.array_prefix_length() == 1)
625 st->put(cp[1]);
626 else
627 st->put(JVM_SIGNATURE_CLASS);
628 } else {
629 st->put(cp[0]);
630 }
631 }
632 }
633
634
635
636 static oop object_java_mirror() {
637 return SystemDictionary::Object_klass()->java_mirror();
638 }
639
640 oop MethodHandles::field_name_or_null(Symbol* s) {
641 if (s == NULL) return NULL;
642 return StringTable::lookup(s);
643 }
644
645 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
646 if (s == NULL) return NULL;
647 BasicType bt = Signature::basic_type(s);
648 if (is_java_primitive(bt)) {
649 assert(s->utf8_length() == 1, "");
650 return java_lang_Class::primitive_mirror(bt);
651 }
652 // Here are some more short cuts for common types.
653 // They are optional, since reference types can be resolved lazily.
654 if (bt == T_OBJECT) {
655 if (s == vmSymbols::object_signature()) {
656 return object_java_mirror();
657 } else if (s == vmSymbols::class_signature()) {
658 return SystemDictionary::Class_klass()->java_mirror();
659 } else if (s == vmSymbols::string_signature()) {
660 return SystemDictionary::String_klass()->java_mirror();
661 }
662 }
663 return NULL;
664 }
665
666
667 // An unresolved member name is a mere symbolic reference.
668 // Resolving it plants a vmtarget/vmindex in it,
669 // which refers directly to JVM internals.
670 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller,
671 bool speculative_resolve, TRAPS) {
672 Handle empty;
673 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
674
675 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
676 // Already resolved.
677 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
678 assert(vmindex >= Method::nonvirtual_vtable_index, "");
679 return mname;
680 }
681
682 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
683 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
684 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
685 int flags = java_lang_invoke_MemberName::flags(mname());
686 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
687 if (!ref_kind_is_valid(ref_kind)) {
688 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
689 }
690
691 DEBUG_ONLY(int old_vmindex);
692 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
693
694 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
695 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
696 }
697
698 InstanceKlass* defc = NULL;
699 {
700 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
701 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
702 if (!defc_klass->is_instance_klass()) {
703 if (!defc_klass->is_array_klass()) return empty;
704 defc_klass = SystemDictionary::Object_klass();
705 }
706 defc = InstanceKlass::cast(defc_klass);
707 }
708 if (defc == NULL) {
709 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
710 }
711 defc->link_class(CHECK_(empty)); // possible safepoint
712
713 // convert the external string name to an internal symbol
714 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
715 if (name == NULL) return empty; // no such name
716 if (name == vmSymbols::class_initializer_name())
717 return empty; // illegal name
718
719 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
720 if ((flags & ALL_KINDS) == IS_METHOD &&
721 (defc == SystemDictionary::MethodHandle_klass() || defc == SystemDictionary::VarHandle_klass()) &&
722 (ref_kind == JVM_REF_invokeVirtual ||
723 ref_kind == JVM_REF_invokeSpecial ||
724 // static invocation mode is required for _linkToVirtual, etc.:
725 ref_kind == JVM_REF_invokeStatic)) {
726 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
727 if (iid != vmIntrinsics::_none &&
728 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
729 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
730 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
731 mh_invoke_id = iid;
732 }
733 }
734
735 // convert the external string or reflective type to an internal signature
736 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
737 if (type == NULL) return empty; // no such signature exists in the VM
738
739 LinkInfo::AccessCheck access_check = caller != NULL ?
740 LinkInfo::needs_access_check :
741 LinkInfo::skip_access_check;
742
743 // Time to do the lookup.
744 switch (flags & ALL_KINDS) {
745 case IS_METHOD:
746 {
747 CallInfo result;
748 LinkInfo link_info(defc, name, type, caller, access_check);
749 {
750 assert(!HAS_PENDING_EXCEPTION, "");
751 if (ref_kind == JVM_REF_invokeStatic) {
752 LinkResolver::resolve_static_call(result,
753 link_info, false, THREAD);
754 } else if (ref_kind == JVM_REF_invokeInterface) {
755 LinkResolver::resolve_interface_call(result, Handle(), defc,
756 link_info, false, THREAD);
757 } else if (mh_invoke_id != vmIntrinsics::_none) {
758 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
759 LinkResolver::resolve_handle_call(result, link_info, THREAD);
760 } else if (ref_kind == JVM_REF_invokeSpecial) {
761 LinkResolver::resolve_special_call(result, Handle(),
762 link_info, THREAD);
763 } else if (ref_kind == JVM_REF_invokeVirtual) {
764 LinkResolver::resolve_virtual_call(result, Handle(), defc,
765 link_info, false, THREAD);
766 } else {
767 assert(false, "ref_kind=%d", ref_kind);
768 }
769 if (HAS_PENDING_EXCEPTION) {
770 if (speculative_resolve) {
771 CLEAR_PENDING_EXCEPTION;
772 }
773 return empty;
774 }
775 }
776 if (result.resolved_appendix().not_null()) {
777 // The resolved MemberName must not be accompanied by an appendix argument,
778 // since there is no way to bind this value into the MemberName.
779 // Caller is responsible to prevent this from happening.
780 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
781 }
782 result.set_resolved_method_name(CHECK_(empty));
783 oop mname2 = init_method_MemberName(mname, result);
784 return Handle(THREAD, mname2);
785 }
786 case IS_CONSTRUCTOR:
787 {
788 CallInfo result;
789 LinkInfo link_info(defc, name, type, caller, access_check);
790 {
791 assert(!HAS_PENDING_EXCEPTION, "");
792 if (name == vmSymbols::object_initializer_name()) {
793 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
794 } else {
795 break; // will throw after end of switch
796 }
797 if (HAS_PENDING_EXCEPTION) {
798 if (speculative_resolve) {
799 CLEAR_PENDING_EXCEPTION;
800 }
801 return empty;
802 }
803 }
804 assert(result.is_statically_bound(), "");
805 result.set_resolved_method_name(CHECK_(empty));
806 oop mname2 = init_method_MemberName(mname, result);
807 return Handle(THREAD, mname2);
808 }
809 case IS_FIELD:
810 {
811 fieldDescriptor result; // find_field initializes fd if found
812 {
813 assert(!HAS_PENDING_EXCEPTION, "");
814 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
815 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
816 if (HAS_PENDING_EXCEPTION) {
817 if (speculative_resolve) {
818 CLEAR_PENDING_EXCEPTION;
819 }
820 return empty;
821 }
822 }
823 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
824 return Handle(THREAD, mname2);
825 }
826 default:
827 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
828 }
829
830 return empty;
831 }
832
833 // Conversely, a member name which is only initialized from JVM internals
834 // may have null defc, name, and type fields.
835 // Resolving it plants a vmtarget/vmindex in it,
836 // which refers directly to JVM internals.
837 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
838 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
839
840 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
841 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
842 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
843 int flags = java_lang_invoke_MemberName::flags(mname());
844
845 if (suppress != 0) {
846 if (suppress & _suppress_defc) have_defc = true;
847 if (suppress & _suppress_name) have_name = true;
848 if (suppress & _suppress_type) have_type = true;
849 }
850
851 if (have_defc && have_name && have_type) return; // nothing needed
852
853 switch (flags & ALL_KINDS) {
854 case IS_METHOD:
855 case IS_CONSTRUCTOR:
856 {
857 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
858 if (vmtarget == NULL) {
859 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
860 }
861 methodHandle m(THREAD, vmtarget);
862 DEBUG_ONLY(vmtarget = NULL); // safety
863 if (!have_defc) {
864 InstanceKlass* defc = m->method_holder();
865 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
866 }
867 if (!have_name) {
868 //not java_lang_String::create_from_symbol; let's intern member names
869 oop name = StringTable::intern(m->name(), CHECK);
870 java_lang_invoke_MemberName::set_name(mname(), name);
871 }
872 if (!have_type) {
873 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
874 java_lang_invoke_MemberName::set_type(mname(), type());
875 }
876 return;
877 }
878 case IS_FIELD:
879 {
880 oop clazz = java_lang_invoke_MemberName::clazz(mname());
881 if (clazz == NULL) {
882 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
883 }
884 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
885 DEBUG_ONLY(clazz = NULL); // safety
886 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
887 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
888 fieldDescriptor fd; // find_field initializes fd if found
889 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
890 break; // cannot expand
891 if (!have_name) {
892 //not java_lang_String::create_from_symbol; let's intern member names
893 oop name = StringTable::intern(fd.name(), CHECK);
894 java_lang_invoke_MemberName::set_name(mname(), name);
895 }
896 if (!have_type) {
897 // If it is a primitive field type, don't mess with short strings like "I".
898 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
899 if (type.is_null()) {
900 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
901 }
902 java_lang_invoke_MemberName::set_type(mname(), type());
903 }
904 return;
905 }
906 }
907 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
908 }
909
910 int MethodHandles::find_MemberNames(Klass* k,
911 Symbol* name, Symbol* sig,
912 int mflags, Klass* caller,
913 int skip, objArrayHandle results, TRAPS) {
914 // %%% take caller into account!
915
916 Thread* thread = Thread::current();
917
918 if (k == NULL || !k->is_instance_klass()) return -1;
919
920 int rfill = 0, rlimit = results->length(), rskip = skip;
921 // overflow measurement:
922 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
923
924 int match_flags = mflags;
925 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
926 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
927 bool local_only = !(search_superc | search_intfc);
928
929 if (name != NULL) {
930 if (name->utf8_length() == 0) return 0; // a match is not possible
931 }
932 if (sig != NULL) {
933 if (sig->starts_with(JVM_SIGNATURE_FUNC))
934 match_flags &= ~(IS_FIELD | IS_TYPE);
935 else
936 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
937 }
938
939 if ((match_flags & IS_TYPE) != 0) {
940 // NYI, and Core Reflection works quite well for this query
941 }
942
943 if ((match_flags & IS_FIELD) != 0) {
944 InstanceKlass* ik = InstanceKlass::cast(k);
945 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
946 if (name != NULL && st.name() != name)
947 continue;
948 if (sig != NULL && st.signature() != sig)
949 continue;
950 // passed the filters
951 if (rskip > 0) {
952 --rskip;
953 } else if (rfill < rlimit) {
954 Handle result(thread, results->obj_at(rfill++));
955 if (!java_lang_invoke_MemberName::is_instance(result()))
956 return -99; // caller bug!
957 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
958 if (saved != result())
959 results->obj_at_put(rfill-1, saved); // show saved instance to user
960 } else if (++overflow >= overflow_limit) {
961 match_flags = 0; break; // got tired of looking at overflow
962 }
963 }
964 }
965
966 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
967 // watch out for these guys:
968 Symbol* init_name = vmSymbols::object_initializer_name();
969 Symbol* clinit_name = vmSymbols::class_initializer_name();
970 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
971 bool negate_name_test = false;
972 // fix name so that it captures the intention of IS_CONSTRUCTOR
973 if (!(match_flags & IS_METHOD)) {
974 // constructors only
975 if (name == NULL) {
976 name = init_name;
977 } else if (name != init_name) {
978 return 0; // no constructors of this method name
979 }
980 } else if (!(match_flags & IS_CONSTRUCTOR)) {
981 // methods only
982 if (name == NULL) {
983 name = init_name;
984 negate_name_test = true; // if we see the name, we *omit* the entry
985 } else if (name == init_name) {
986 return 0; // no methods of this constructor name
987 }
988 } else {
989 // caller will accept either sort; no need to adjust name
990 }
991 InstanceKlass* ik = InstanceKlass::cast(k);
992 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
993 Method* m = st.method();
994 Symbol* m_name = m->name();
995 if (m_name == clinit_name)
996 continue;
997 if (name != NULL && ((m_name != name) ^ negate_name_test))
998 continue;
999 if (sig != NULL && m->signature() != sig)
1000 continue;
1001 // passed the filters
1002 if (rskip > 0) {
1003 --rskip;
1004 } else if (rfill < rlimit) {
1005 Handle result(thread, results->obj_at(rfill++));
1006 if (!java_lang_invoke_MemberName::is_instance(result()))
1007 return -99; // caller bug!
1008 CallInfo info(m, NULL, CHECK_0);
1009 oop saved = MethodHandles::init_method_MemberName(result, info);
1010 if (saved != result())
1011 results->obj_at_put(rfill-1, saved); // show saved instance to user
1012 } else if (++overflow >= overflow_limit) {
1013 match_flags = 0; break; // got tired of looking at overflow
1014 }
1015 }
1016 }
1017
1018 // return number of elements we at leasted wanted to initialize
1019 return rfill + overflow;
1020 }
1021
1022 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
1023 assert_locked_or_safepoint(CodeCache_lock);
1024
1025 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1026 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1027 // Try to purge stale entries on updates.
1028 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
1029 // in order to avoid memory leak, stale entries are purged whenever a dependency list
1030 // is changed (both on addition and removal). Though memory reclamation is delayed,
1031 // it avoids indefinite memory usage growth.
1032 deps.add_dependent_nmethod(nm);
1033 }
1034
1035 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
1036 assert_locked_or_safepoint(CodeCache_lock);
1037
1038 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1039 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1040 deps.remove_dependent_nmethod(nm);
1041 }
1042
1043 void MethodHandles::clean_dependency_context(oop call_site) {
1044 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1045 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1046 deps.clean_unloading_dependents();
1047 }
1048
1049 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
1050 assert_lock_strong(Compile_lock);
1051
1052 int marked = 0;
1053 CallSiteDepChange changes(call_site, target);
1054 {
1055 NoSafepointVerifier nsv;
1056 MutexLocker mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1057
1058 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site());
1059 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1060 marked = deps.mark_dependent_nmethods(changes);
1061 }
1062 if (marked > 0) {
1063 // At least one nmethod has been marked for deoptimization.
1064 Deoptimization::deoptimize_all_marked();
1065 }
1066 }
1067
1068 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
1069 if (TraceMethodHandles) {
1070 const char* name = vmIntrinsics::name_at(iid);
1071 if (*name == '_') name += 1;
1072 const size_t len = strlen(name) + 50;
1073 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
1074 const char* suffix = "";
1075 if (is_signature_polymorphic(iid)) {
1076 if (is_signature_polymorphic_static(iid))
1077 suffix = "/static";
1078 else
1079 suffix = "/private";
1080 }
1081 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
1082 trace_method_handle(_masm, qname);
1083 // Note: Don't free the allocated char array because it's used
1084 // during runtime.
1085 }
1086 }
1087
1088 //
1089 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1090 // They are the private interface between this JVM and the HotSpot-specific
1091 // Java code that implements JSR 292 method handles.
1092 //
1093 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1094 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1095 //
1096
1097 #ifndef PRODUCT
1098 #define EACH_NAMED_CON(template, requirement) \
1099 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1100 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1101 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1102 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1103 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1104 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1105 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1106 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1107 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1108 /*end*/
1109
1110 #define IGNORE_REQ(req_expr) /* req_expr */
1111 #define ONE_PLUS(scope,value) 1+
1112 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1113 #define VALUE_COMMA(scope,value) scope::value,
1114 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1115 #define STRING_NULL(scope,value) #value "\0"
1116 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1117
1118 static bool advertise_con_value(int which) {
1119 if (which < 0) return false;
1120 bool ok = true;
1121 int count = 0;
1122 #define INC_COUNT(scope,value) \
1123 ++count;
1124 #define CHECK_REQ(req_expr) \
1125 if (which < count) return ok; \
1126 ok = (req_expr);
1127 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1128 #undef INC_COUNT
1129 #undef CHECK_REQ
1130 assert(count == con_value_count, "");
1131 if (which < count) return ok;
1132 return false;
1133 }
1134
1135 #undef ONE_PLUS
1136 #undef VALUE_COMMA
1137 #undef STRING_NULL
1138 #undef EACH_NAMED_CON
1139 #endif // PRODUCT
1140
1141 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1142 #ifndef PRODUCT
1143 if (advertise_con_value(which)) {
1144 assert(which >= 0 && which < con_value_count, "");
1145 int con = con_values[which];
1146 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1147 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1148 const char* str = &con_names[0];
1149 for (int i = 0; i < which; i++)
1150 str += strlen(str) + 1; // skip name and null
1151 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1152 box->obj_at_put(0, name);
1153 }
1154 return con;
1155 }
1156 #endif
1157 return 0;
1158 }
1159 JVM_END
1160
1161 // void init(MemberName self, AccessibleObject ref)
1162 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1163 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1164 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1165 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1166 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1167 MethodHandles::init_MemberName(mname, target, CHECK);
1168 }
1169 JVM_END
1170
1171 // void expand(MemberName self)
1172 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1173 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1174 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1175 MethodHandles::expand_MemberName(mname, 0, CHECK);
1176 }
1177 JVM_END
1178
1179 // void resolve(MemberName self, Class<?> caller)
1180 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1181 jboolean speculative_resolve)) {
1182 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1183 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1184
1185 // The trusted Java code that calls this method should already have performed
1186 // access checks on behalf of the given caller. But, we can verify this.
1187 if (VerifyMethodHandles && caller_jh != NULL &&
1188 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1189 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1190 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1191 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1192 }
1193
1194 // Reflection::verify_class_access can only handle instance classes.
1195 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1196 // Emulate LinkResolver::check_klass_accessability.
1197 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1198 if (caller != SystemDictionary::Object_klass()
1199 && Reflection::verify_class_access(caller,
1200 InstanceKlass::cast(reference_klass),
1201 true) != Reflection::ACCESS_OK) {
1202 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1203 }
1204 }
1205 }
1206
1207 Klass* caller = caller_jh == NULL ? NULL :
1208 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1209 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, speculative_resolve == JNI_TRUE,
1210 CHECK_NULL);
1211
1212 if (resolved.is_null()) {
1213 int flags = java_lang_invoke_MemberName::flags(mname());
1214 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1215 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1216 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1217 }
1218 if (speculative_resolve) {
1219 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1220 return NULL;
1221 }
1222 if ((flags & ALL_KINDS) == IS_FIELD) {
1223 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1224 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1225 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1226 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1227 } else {
1228 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1229 }
1230 }
1231
1232 return JNIHandles::make_local(THREAD, resolved());
1233 }
1234 JVM_END
1235
1236 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1237 if (mname == NULL ||
1238 java_lang_invoke_MemberName::clazz(mname) == NULL) {
1239 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1240 } else {
1241 int flags = java_lang_invoke_MemberName::flags(mname);
1242 if ((flags & IS_FIELD) != 0 &&
1243 (must_be_static
1244 ? (flags & JVM_ACC_STATIC) != 0
1245 : (flags & JVM_ACC_STATIC) == 0)) {
1246 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1247 return (jlong) vmindex;
1248 }
1249 }
1250 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1251 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1252 return 0;
1253 }
1254
1255 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1256 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1257 }
1258 JVM_END
1259
1260 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1261 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1262 }
1263 JVM_END
1264
1265 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1266 // use the other function to perform sanity checks:
1267 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1268 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1269 return JNIHandles::make_local(THREAD, clazz);
1270 }
1271 JVM_END
1272
1273 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1274 if (mname_jh == NULL) return NULL;
1275 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1276 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1277 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1278 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1279 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1280 result->obj_at_put(0, x);
1281
1282 int flags = java_lang_invoke_MemberName::flags(mname());
1283 if ((flags & IS_FIELD) != 0) {
1284 x = java_lang_invoke_MemberName::clazz(mname());
1285 } else {
1286 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1287 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1288 x = mname();
1289 }
1290 result->obj_at_put(1, x);
1291 return JNIHandles::make_local(env, result());
1292 }
1293 JVM_END
1294
1295
1296
1297 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1298 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1299 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1300 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1301 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1302 if (clazz_jh == NULL || results_jh == NULL) return -1;
1303 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1304
1305 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1306 if (results.is_null() || !results->is_objArray()) return -1;
1307
1308 TempNewSymbol name = NULL;
1309 TempNewSymbol sig = NULL;
1310 if (name_jh != NULL) {
1311 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1312 if (name == NULL) return 0; // a match is not possible
1313 }
1314 if (sig_jh != NULL) {
1315 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1316 if (sig == NULL) return 0; // a match is not possible
1317 }
1318
1319 Klass* caller = NULL;
1320 if (caller_jh != NULL) {
1321 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1322 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1323 caller = java_lang_Class::as_Klass(caller_oop);
1324 }
1325
1326 if (name != NULL && sig != NULL && results.not_null()) {
1327 // try a direct resolve
1328 // %%% TO DO
1329 }
1330
1331 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1332 caller, skip, results, CHECK_0);
1333 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1334 return res;
1335 }
1336 JVM_END
1337
1338 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1339 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1340 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1341 {
1342 // Walk all nmethods depending on this call site.
1343 MutexLocker mu(thread, Compile_lock);
1344 MethodHandles::flush_dependent_nmethods(call_site, target);
1345 java_lang_invoke_CallSite::set_target(call_site(), target());
1346 }
1347 }
1348 JVM_END
1349
1350 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1351 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1352 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1353 {
1354 // Walk all nmethods depending on this call site.
1355 MutexLocker mu(thread, Compile_lock);
1356 MethodHandles::flush_dependent_nmethods(call_site, target);
1357 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1358 }
1359 }
1360 JVM_END
1361
1362 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1363 jobject caller_jh, jintArray index_info_jh,
1364 jint start, jint end,
1365 jobjectArray buf_jh, jint pos,
1366 jboolean resolve, jobject ifna_jh)) {
1367 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1368 if (caller_k == NULL || !caller_k->is_instance_klass()) {
1369 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1370 }
1371 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1372 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1373 if (index_info_oop == NULL ||
1374 index_info_oop->klass() != Universe::intArrayKlassObj() ||
1375 typeArrayOop(index_info_oop)->length() < 2) {
1376 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1377 }
1378 typeArrayHandle index_info(THREAD, index_info_oop);
1379 int bss_index_in_pool = index_info->int_at(1);
1380 // While we are here, take a quick look at the index info:
1381 if (bss_index_in_pool <= 0 ||
1382 bss_index_in_pool >= caller->constants()->length() ||
1383 index_info->int_at(0)
1384 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1385 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1386 }
1387 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1388 if (start < 0) {
1389 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1390 if (start == pseudo_index) {
1391 if (start >= end || 0 > pos || pos >= buf->length()) break;
1392 oop pseudo_arg = NULL;
1393 switch (pseudo_index) {
1394 case -4: // bootstrap method
1395 {
1396 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool);
1397 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1398 break;
1399 }
1400 case -3: // name
1401 {
1402 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool);
1403 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1404 pseudo_arg = str();
1405 break;
1406 }
1407 case -2: // type
1408 {
1409 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool);
1410 Handle th;
1411 if (type->char_at(0) == JVM_SIGNATURE_FUNC) {
1412 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1413 } else {
1414 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1415 }
1416 pseudo_arg = th();
1417 break;
1418 }
1419 case -1: // argument count
1420 {
1421 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool);
1422 jvalue argc_value; argc_value.i = (jint)argc;
1423 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1424 break;
1425 }
1426 }
1427
1428 // Store the pseudo-argument, and advance the pointers.
1429 buf->obj_at_put(pos++, pseudo_arg);
1430 ++start;
1431 }
1432 }
1433 // When we are done with this there may be regular arguments to process too.
1434 }
1435 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1436 caller->constants()->
1437 copy_bootstrap_arguments_at(bss_index_in_pool,
1438 start, end, buf, pos,
1439 (resolve == JNI_TRUE), ifna, CHECK);
1440 }
1441 JVM_END
1442
1443 // It is called by a Cleaner object which ensures that dropped CallSites properly
1444 // deallocate their dependency information.
1445 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1446 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1447 {
1448 // Walk all nmethods depending on this call site.
1449 MutexLocker mu1(thread, Compile_lock);
1450
1451 int marked = 0;
1452 {
1453 NoSafepointVerifier nsv;
1454 MutexLocker mu2(THREAD, CodeCache_lock, Mutex::_no_safepoint_check_flag);
1455 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1456 marked = deps.remove_all_dependents();
1457 }
1458 if (marked > 0) {
1459 // At least one nmethod has been marked for deoptimization
1460 Deoptimization::deoptimize_all_marked();
1461 }
1462 }
1463 }
1464 JVM_END
1465
1466 /**
1467 * Throws a java/lang/UnsupportedOperationException unconditionally.
1468 * This is required by the specification of MethodHandle.invoke if
1469 * invoked directly.
1470 */
1471 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1472 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1473 return NULL;
1474 }
1475 JVM_END
1476
1477 /**
1478 * Throws a java/lang/UnsupportedOperationException unconditionally.
1479 * This is required by the specification of MethodHandle.invokeExact if
1480 * invoked directly.
1481 */
1482 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1483 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1484 return NULL;
1485 }
1486 JVM_END
1487
1488 /// JVM_RegisterMethodHandleMethods
1489
1490 #undef CS // Solaris builds complain
1491
1492 #define LANG "Ljava/lang/"
1493 #define JLINV "Ljava/lang/invoke/"
1494
1495 #define OBJ LANG "Object;"
1496 #define CLS LANG "Class;"
1497 #define STRG LANG "String;"
1498 #define CS JLINV "CallSite;"
1499 #define MT JLINV "MethodType;"
1500 #define MH JLINV "MethodHandle;"
1501 #define MEM JLINV "MemberName;"
1502 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1503
1504 #define CC (char*) /*cast a literal from (const char*)*/
1505 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1506
1507 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1508 static JNINativeMethod MHN_methods[] = {
1509 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1510 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1511 {CC "resolve", CC "(" MEM "" CLS "Z)" MEM, FN_PTR(MHN_resolve_Mem)},
1512 // static native int getNamedCon(int which, Object[] name)
1513 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1514 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1515 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1516 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1517 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1518 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1519 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1520 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1521 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1522 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1523 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1524 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1525 };
1526
1527 static JNINativeMethod MH_methods[] = {
1528 // UnsupportedOperationException throwers
1529 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1530 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1531 };
1532
1533 /**
1534 * This one function is exported, used by NativeLookup.
1535 */
1536 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1537 assert(!MethodHandles::enabled(), "must not be enabled");
1538 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1539
1540 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1541 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1542
1543 {
1544 ThreadToNativeFromVM ttnfv(thread);
1545
1546 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1547 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1548 "register java.lang.invoke.MethodHandleNative natives");
1549
1550 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1551 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1552 "register java.lang.invoke.MethodHandle natives");
1553 }
1554
1555 if (TraceInvokeDynamic) {
1556 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1557 }
1558
1559 MethodHandles::set_enabled(true);
1560 }
1561 JVM_END