1 /*
2 * Copyright (c) 2008, 2018, 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 "code/codeCache.hpp"
29 #include "code/dependencyContext.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "interpreter/oopMapCache.hpp"
33 #include "interpreter/linkResolver.hpp"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "oops/objArrayOop.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "oops/typeArrayOop.inline.hpp"
40 #include "prims/methodHandles.hpp"
41 #include "runtime/compilationPolicy.hpp"
42 #include "runtime/fieldDescriptor.inline.hpp"
43 #include "runtime/interfaceSupport.inline.hpp"
44 #include "runtime/javaCalls.hpp"
45 #include "runtime/jniHandles.inline.hpp"
46 #include "runtime/timerTrace.hpp"
47 #include "runtime/reflection.hpp"
48 #include "runtime/safepointVerifiers.hpp"
49 #include "runtime/signature.hpp"
50 #include "runtime/stubRoutines.hpp"
51 #include "utilities/exceptions.hpp"
52
53
54 /*
55 * JSR 292 reference implementation: method handles
56 * The JDK 7 reference implementation represented method handle
57 * combinations as chains. Each link in the chain had a "vmentry"
58 * field which pointed at a bit of assembly code which performed
59 * one transformation before dispatching to the next link in the chain.
60 *
61 * The current reference implementation pushes almost all code generation
62 * responsibility to (trusted) Java code. A method handle contains a
63 * pointer to its "LambdaForm", which embodies all details of the method
64 * handle's behavior. The LambdaForm is a normal Java object, managed
65 * by a runtime coded in Java.
66 */
67
68 bool MethodHandles::_enabled = false; // set true after successful native linkage
69 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
70
71 /**
72 * Generates method handle adapters. Returns 'false' if memory allocation
73 * failed and true otherwise.
74 */
75 void MethodHandles::generate_adapters() {
76 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
77 assert(_adapter_code == NULL, "generate only once");
78
79 ResourceMark rm;
80 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
81 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
82 CodeBuffer code(_adapter_code);
83 MethodHandlesAdapterGenerator g(&code);
84 g.generate();
85 code.log_section_sizes("MethodHandlesAdapterBlob");
86 }
87
88 //------------------------------------------------------------------------------
89 // MethodHandlesAdapterGenerator::generate
90 //
91 void MethodHandlesAdapterGenerator::generate() {
92 // Generate generic method handle adapters.
93 // Generate interpreter entries
94 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
95 mk <= Interpreter::method_handle_invoke_LAST;
96 mk = Interpreter::MethodKind(1 + (int)mk)) {
97 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
98 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
99 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
100 if (entry != NULL) {
101 Interpreter::set_entry_for_kind(mk, entry);
102 }
103 // If the entry is not set, it will throw AbstractMethodError.
104 }
105 }
106
107 void MethodHandles::set_enabled(bool z) {
108 if (_enabled != z) {
109 guarantee(z, "can only enable once");
110 _enabled = z;
111 }
112 }
113
114 // MemberName support
115
116 // import java_lang_invoke_MemberName.*
117 enum {
118 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
119 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
120 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
121 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
122 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
123 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
124 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
125 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
126 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
127 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
128 };
129
130 int MethodHandles::ref_kind_to_flags(int ref_kind) {
131 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
132 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
133 if (ref_kind_is_field(ref_kind)) {
134 flags |= IS_FIELD;
135 } else if (ref_kind_is_method(ref_kind)) {
136 flags |= IS_METHOD;
137 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
138 flags |= IS_CONSTRUCTOR;
139 }
140 return flags;
141 }
142
143 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
144 Handle empty;
145 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
146 if (!java_lang_String::is_instance_inlined(type())) {
147 return type; // already resolved
148 }
149 Symbol* signature = java_lang_String::as_symbol_or_null(type());
150 if (signature == NULL) {
151 return empty; // no such signature exists in the VM
152 }
153 Handle resolved;
154 int flags = java_lang_invoke_MemberName::flags(mname());
155 bool check_access = false; // is this right?
156 switch (flags & ALL_KINDS) {
157 case IS_METHOD:
158 case IS_CONSTRUCTOR:
159 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
160 break;
161 case IS_FIELD:
162 resolved = SystemDictionary::find_java_mirror_for_type(signature, caller, SignatureStream::NCDFError, check_access, CHECK_(empty));
163 break;
164 default:
165 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
166 }
167 if (resolved.is_null()) {
168 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
169 }
170 return resolved;
171 }
172
173 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
174 // This method is used from java.lang.invoke.MemberName constructors.
175 // It fills in the new MemberName from a java.lang.reflect.Member.
176 Thread* thread = Thread::current();
177 oop target_oop = target();
178 Klass* target_klass = target_oop->klass();
179 if (target_klass == SystemDictionary::reflect_Field_klass()) {
180 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
181 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
182 Klass* k = java_lang_Class::as_Klass(clazz);
183 if (k != NULL && k->is_instance_klass()) {
184 fieldDescriptor fd(InstanceKlass::cast(k), slot);
185 oop mname2 = init_field_MemberName(mname, fd);
186 if (mname2 != NULL) {
187 // Since we have the reified name and type handy, add them to the result.
188 if (java_lang_invoke_MemberName::name(mname2) == NULL)
189 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
190 if (java_lang_invoke_MemberName::type(mname2) == NULL)
191 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
192 }
193 return mname2;
194 }
195 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
196 oop clazz = java_lang_reflect_Method::clazz(target_oop);
197 int slot = java_lang_reflect_Method::slot(target_oop);
198 Klass* k = java_lang_Class::as_Klass(clazz);
199 if (k != NULL && k->is_instance_klass()) {
200 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
201 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
202 return NULL; // do not resolve unless there is a concrete signature
203 CallInfo info(m, k, CHECK_NULL);
204 return init_method_MemberName(mname, info);
205 }
206 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
207 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
208 int slot = java_lang_reflect_Constructor::slot(target_oop);
209 Klass* k = java_lang_Class::as_Klass(clazz);
210 if (k != NULL && k->is_instance_klass()) {
211 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
212 if (m == NULL) return NULL;
213 CallInfo info(m, k, CHECK_NULL);
214 return init_method_MemberName(mname, info);
215 }
216 }
217 return NULL;
218 }
219
220 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
221 assert(info.resolved_appendix().is_null(), "only normal methods here");
222 methodHandle m = info.resolved_method();
223 assert(m.not_null(), "null method handle");
224 InstanceKlass* m_klass = m->method_holder();
225 assert(m_klass != NULL, "null holder for method handle");
226 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
227 int vmindex = Method::invalid_vtable_index;
228
229 switch (info.call_kind()) {
230 case CallInfo::itable_call:
231 vmindex = info.itable_index();
232 // More importantly, the itable index only works with the method holder.
233 assert(m_klass->verify_itable_index(vmindex), "");
234 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
235 if (TraceInvokeDynamic) {
236 ttyLocker ttyl;
237 ResourceMark rm;
238 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
239 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
240 vmindex);
241 m->access_flags().print_on(tty);
242 if (!m->is_abstract()) {
243 if (!m->is_private()) {
244 tty->print("default");
245 }
246 else {
247 tty->print("private-intf");
248 }
249 }
250 tty->cr();
251 }
252 break;
253
254 case CallInfo::vtable_call:
255 vmindex = info.vtable_index();
256 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
257 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
258 if (m_klass->is_interface()) {
259 // This is a vtable call to an interface method (abstract "miranda method" or default method).
260 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
261 // (LinkResolver should help us figure this out.)
262 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass");
263 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass());
264 if (m_klass_non_interface->is_interface()) {
265 m_klass_non_interface = SystemDictionary::Object_klass();
266 #ifdef ASSERT
267 { ResourceMark rm;
268 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
269 assert(m->name() == m2->name() && m->signature() == m2->signature(),
270 "at %d, %s != %s", vmindex,
271 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
272 }
273 #endif //ASSERT
274 }
275 if (!m->is_public()) {
276 assert(m->is_public(), "virtual call must be to public interface method");
277 return NULL; // elicit an error later in product build
278 }
279 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
280 m_klass = m_klass_non_interface;
281 }
282 if (TraceInvokeDynamic) {
283 ttyLocker ttyl;
284 ResourceMark rm;
285 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
286 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
287 m_klass->internal_name(), vmindex);
288 m->access_flags().print_on(tty);
289 if (m->is_default_method()) {
290 tty->print("default");
291 }
292 tty->cr();
293 }
294 break;
295
296 case CallInfo::direct_call:
297 vmindex = Method::nonvirtual_vtable_index;
298 if (m->is_static()) {
299 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
300 } else if (m->is_initializer()) {
301 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
302 } else {
303 // "special" reflects that this is a direct call, not that it
304 // necessarily originates from an invokespecial. We can also do
305 // direct calls for private and/or final non-static methods.
306 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
307 }
308 break;
309
310 default: assert(false, "bad CallInfo"); return NULL;
311 }
312
313 // @CallerSensitive annotation detected
314 if (m->caller_sensitive()) {
315 flags |= CALLER_SENSITIVE;
316 }
317
318 Handle resolved_method = info.resolved_method_name();
319 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m(),
320 "Should not change after link resolution");
321
322 oop mname_oop = mname();
323 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
324 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
325 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
326 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
327 // Note: name and type can be lazily computed by resolve_MemberName,
328 // if Java code needs them as resolved String and MethodType objects.
329 // If relevant, the vtable or itable value is stored as vmindex.
330 // This is done eagerly, since it is readily available without
331 // constructing any new objects.
332 return mname();
333 }
334
335 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
336 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
337 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
338 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
339 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
340
341 oop mname_oop = mname();
342 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
343 java_lang_invoke_MemberName::set_method (mname_oop, NULL);
344 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
345 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror());
346
347 oop type = field_signature_type_or_null(fd.signature());
348 oop name = field_name_or_null(fd.name());
349 if (name != NULL)
350 java_lang_invoke_MemberName::set_name(mname_oop, name);
351 if (type != NULL)
352 java_lang_invoke_MemberName::set_type(mname_oop, type);
353 // Note: name and type can be lazily computed by resolve_MemberName,
354 // if Java code needs them as resolved String and Class objects.
355 // Note that the incoming type oop might be pre-resolved (non-null).
356 // The base clazz and field offset (vmindex) must be eagerly stored,
357 // because they unambiguously identify the field.
358 // Although the fieldDescriptor::_index would also identify the field,
359 // we do not use it, because it is harder to decode.
360 // TO DO: maybe intern mname_oop
361 return mname();
362 }
363
364 // JVM 2.9 Special Methods:
365 // A method is signature polymorphic if and only if all of the following conditions hold :
366 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
367 // * It has a single formal parameter of type Object[].
368 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
369 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
370 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
371 if (klass == NULL)
372 return false;
373 // The following test will fail spuriously during bootstrap of MethodHandle itself:
374 // if (klass != SystemDictionary::MethodHandle_klass())
375 // Test the name instead:
376 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
377 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
378 return false;
379 }
380
381 // Look up signature polymorphic method with polymorphic return type
382 Symbol* poly_sig = vmSymbols::object_array_object_signature();
383 InstanceKlass* iklass = InstanceKlass::cast(klass);
384 Method* m = iklass->find_method(name, poly_sig);
385 if (m != NULL) {
386 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
387 int flags = m->access_flags().as_int();
388 if ((flags & required) == required) {
389 return true;
390 }
391 }
392
393 // Look up signature polymorphic method with non-polymorphic (non Object) return type
394 int me;
395 int ms = iklass->find_method_by_name(name, &me);
396 if (ms == -1) return false;
397 for (; ms < me; ms++) {
398 Method* m = iklass->methods()->at(ms);
399 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
400 int flags = m->access_flags().as_int();
401 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
402 return true;
403 }
404 }
405 return false;
406 }
407
408
409 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
410 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
411 switch (iid) {
412 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
413 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
414 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
415 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
416 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
417 default:
418 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
419 return 0;
420 }
421 }
422
423 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
424 switch(id) {
425 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
426 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
427 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
428 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
429 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
430 default:
431 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
432 return Bytecodes::_illegal;
433 }
434 }
435
436 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
437 switch (iid) {
438 case vmIntrinsics::_invokeBasic: return 0;
439 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
440 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
441 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
442 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
443 default:
444 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
445 return 0;
446 }
447 }
448
449 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
450 vmSymbols::SID name_id = vmSymbols::find_sid(name);
451 switch (name_id) {
452 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
453 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
454 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
455 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
456
457 // There is one static signature-polymorphic method for each JVM invocation mode.
458 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
459 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
460 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
461 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
462 default: break;
463 }
464
465 // Cover the case of invokeExact and any future variants of invokeFoo.
466 Klass* mh_klass = SystemDictionary::well_known_klass(
467 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
468 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
469 return vmIntrinsics::_invokeGeneric;
470 }
471
472 // Cover the case of methods on VarHandle.
473 Klass* vh_klass = SystemDictionary::well_known_klass(
474 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) );
475 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
476 return vmIntrinsics::_invokeGeneric;
477 }
478
479 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
480 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
481 return vmIntrinsics::_none;
482 }
483
484 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
485 if (klass != NULL &&
486 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
487 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
488 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
489 if (iid != vmIntrinsics::_none)
490 return iid;
491 if (is_method_handle_invoke_name(klass, name))
492 return vmIntrinsics::_invokeGeneric;
493 }
494 return vmIntrinsics::_none;
495 }
496
497 // Returns true if method is signature polymorphic and public
498 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
499 if (is_signature_polymorphic_name(klass, name)) {
500 InstanceKlass* iklass = InstanceKlass::cast(klass);
501 int me;
502 int ms = iklass->find_method_by_name(name, &me);
503 assert(ms != -1, "");
504 for (; ms < me; ms++) {
505 Method* m = iklass->methods()->at(ms);
506 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
507 int flags = m->access_flags().as_int();
508 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
509 return true;
510 }
511 }
512 }
513 return false;
514 }
515
516 // convert the external string or reflective type to an internal signature
517 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
518 if (java_lang_invoke_MethodType::is_instance(type_str)) {
519 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
520 } else if (java_lang_Class::is_instance(type_str)) {
521 return java_lang_Class::as_signature(type_str, false, THREAD);
522 } else if (java_lang_String::is_instance_inlined(type_str)) {
523 if (intern_if_not_found) {
524 return java_lang_String::as_symbol(type_str, THREAD);
525 } else {
526 return java_lang_String::as_symbol_or_null(type_str);
527 }
528 } else {
529 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
530 }
531 }
532
533 static const char OBJ_SIG[] = "Ljava/lang/Object;";
534 enum { OBJ_SIG_LEN = 18 };
535
536 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
537 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
538 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
539 const int len = sig->utf8_length();
540 for (int i = 0; i < len; i++) {
541 switch (sig->byte_at(i)) {
542 case 'L':
543 // only java/lang/Object is valid here
544 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
545 return false;
546 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
547 continue;
548 case '(': case ')': case 'V':
549 case 'I': case 'J': case 'F': case 'D':
550 continue;
551 //case '[':
552 //case 'Z': case 'B': case 'C': case 'S':
553 default:
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->byte_at(0) != '(') {
568 BasicType bt = char2type(sig->byte_at(0));
569 if (is_subword_type(bt)) {
570 bsig = vmSymbols::int_signature();
571 } else {
572 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
573 bsig = vmSymbols::object_signature();
574 }
575 } else {
576 ResourceMark rm;
577 stringStream buffer(128);
578 buffer.put('(');
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(')');
587 }
588 if (arg_pos == keep_arg_pos) {
589 buffer.write((char*) ss.raw_bytes(),
590 (int) ss.raw_length());
591 } else if (bt == T_OBJECT || bt == T_ARRAY) {
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, THREAD);
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 bool keep_arrays,
613 bool keep_basic_names) {
614 st = st ? st : tty;
615 int len = sig->utf8_length();
616 int array = 0;
617 bool prev_type = false;
618 for (int i = 0; i < len; i++) {
619 char ch = sig->byte_at(i);
620 switch (ch) {
621 case '(': case ')':
622 prev_type = false;
623 st->put(ch);
624 continue;
625 case '[':
626 if (!keep_basic_names && keep_arrays)
627 st->put(ch);
628 array++;
629 continue;
630 case 'L':
631 {
632 if (prev_type) st->put(',');
633 int start = i+1, slash = start;
634 while (++i < len && (ch = sig->byte_at(i)) != ';') {
635 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
636 }
637 if (slash < i) start = slash;
638 if (!keep_basic_names) {
639 st->put('L');
640 } else {
641 for (int j = start; j < i; j++)
642 st->put(sig->byte_at(j));
643 prev_type = true;
644 }
645 break;
646 }
647 default:
648 {
649 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
650 ch = '[';
651 array = 0;
652 }
653 if (prev_type) st->put(',');
654 const char* n = NULL;
655 if (keep_basic_names)
656 n = type2name(char2type(ch));
657 if (n == NULL) {
658 // unknown letter, or we don't want to know its name
659 st->put(ch);
660 } else {
661 st->print("%s", n);
662 prev_type = true;
663 }
664 break;
665 }
666 }
667 // Switch break goes here to take care of array suffix:
668 if (prev_type) {
669 while (array > 0) {
670 st->print("[]");
671 --array;
672 }
673 }
674 array = 0;
675 }
676 }
677
678
679
680 static oop object_java_mirror() {
681 return SystemDictionary::Object_klass()->java_mirror();
682 }
683
684 oop MethodHandles::field_name_or_null(Symbol* s) {
685 if (s == NULL) return NULL;
686 return StringTable::lookup(s);
687 }
688
689 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
690 if (s == NULL) return NULL;
691 BasicType bt = FieldType::basic_type(s);
692 if (is_java_primitive(bt)) {
693 assert(s->utf8_length() == 1, "");
694 return java_lang_Class::primitive_mirror(bt);
695 }
696 // Here are some more short cuts for common types.
697 // They are optional, since reference types can be resolved lazily.
698 if (bt == T_OBJECT) {
699 if (s == vmSymbols::object_signature()) {
700 return object_java_mirror();
701 } else if (s == vmSymbols::class_signature()) {
702 return SystemDictionary::Class_klass()->java_mirror();
703 } else if (s == vmSymbols::string_signature()) {
704 return SystemDictionary::String_klass()->java_mirror();
705 }
706 }
707 return NULL;
708 }
709
710
711 // An unresolved member name is a mere symbolic reference.
712 // Resolving it plants a vmtarget/vmindex in it,
713 // which refers directly to JVM internals.
714 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller,
715 bool speculative_resolve, TRAPS) {
716 Handle empty;
717 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
718
719 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
720 // Already resolved.
721 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
722 assert(vmindex >= Method::nonvirtual_vtable_index, "");
723 return mname;
724 }
725
726 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
727 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
728 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
729 int flags = java_lang_invoke_MemberName::flags(mname());
730 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
731 if (!ref_kind_is_valid(ref_kind)) {
732 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
733 }
734
735 DEBUG_ONLY(int old_vmindex);
736 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
737
738 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
739 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
740 }
741
742 InstanceKlass* defc = NULL;
743 {
744 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
745 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
746 if (!defc_klass->is_instance_klass()) {
747 if (!defc_klass->is_array_klass()) return empty;
748 defc_klass = SystemDictionary::Object_klass();
749 }
750 defc = InstanceKlass::cast(defc_klass);
751 }
752 if (defc == NULL) {
753 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
754 }
755 defc->link_class(CHECK_(empty)); // possible safepoint
756
757 // convert the external string name to an internal symbol
758 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
759 if (name == NULL) return empty; // no such name
760 if (name == vmSymbols::class_initializer_name())
761 return empty; // illegal name
762
763 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
764 if ((flags & ALL_KINDS) == IS_METHOD &&
765 (defc == SystemDictionary::MethodHandle_klass() || defc == SystemDictionary::VarHandle_klass()) &&
766 (ref_kind == JVM_REF_invokeVirtual ||
767 ref_kind == JVM_REF_invokeSpecial ||
768 // static invocation mode is required for _linkToVirtual, etc.:
769 ref_kind == JVM_REF_invokeStatic)) {
770 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
771 if (iid != vmIntrinsics::_none &&
772 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
773 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
774 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
775 mh_invoke_id = iid;
776 }
777 }
778
779 // convert the external string or reflective type to an internal signature
780 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
781 if (type == NULL) return empty; // no such signature exists in the VM
782
783 LinkInfo::AccessCheck access_check = caller != NULL ?
784 LinkInfo::needs_access_check :
785 LinkInfo::skip_access_check;
786
787 // Time to do the lookup.
788 switch (flags & ALL_KINDS) {
789 case IS_METHOD:
790 {
791 CallInfo result;
792 LinkInfo link_info(defc, name, type, caller, access_check);
793 {
794 assert(!HAS_PENDING_EXCEPTION, "");
795 if (ref_kind == JVM_REF_invokeStatic) {
796 LinkResolver::resolve_static_call(result,
797 link_info, false, THREAD);
798 } else if (ref_kind == JVM_REF_invokeInterface) {
799 LinkResolver::resolve_interface_call(result, Handle(), defc,
800 link_info, false, THREAD);
801 } else if (mh_invoke_id != vmIntrinsics::_none) {
802 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
803 LinkResolver::resolve_handle_call(result, link_info, THREAD);
804 } else if (ref_kind == JVM_REF_invokeSpecial) {
805 LinkResolver::resolve_special_call(result, Handle(),
806 link_info, THREAD);
807 } else if (ref_kind == JVM_REF_invokeVirtual) {
808 LinkResolver::resolve_virtual_call(result, Handle(), defc,
809 link_info, false, THREAD);
810 } else {
811 assert(false, "ref_kind=%d", ref_kind);
812 }
813 if (HAS_PENDING_EXCEPTION) {
814 if (speculative_resolve) {
815 CLEAR_PENDING_EXCEPTION;
816 }
817 return empty;
818 }
819 }
820 if (result.resolved_appendix().not_null()) {
821 // The resolved MemberName must not be accompanied by an appendix argument,
822 // since there is no way to bind this value into the MemberName.
823 // Caller is responsible to prevent this from happening.
824 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
825 }
826 result.set_resolved_method_name(CHECK_(empty));
827 oop mname2 = init_method_MemberName(mname, result);
828 return Handle(THREAD, mname2);
829 }
830 case IS_CONSTRUCTOR:
831 {
832 CallInfo result;
833 LinkInfo link_info(defc, name, type, caller, access_check);
834 {
835 assert(!HAS_PENDING_EXCEPTION, "");
836 if (name == vmSymbols::object_initializer_name()) {
837 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
838 } else {
839 break; // will throw after end of switch
840 }
841 if (HAS_PENDING_EXCEPTION) {
842 if (speculative_resolve) {
843 CLEAR_PENDING_EXCEPTION;
844 }
845 return empty;
846 }
847 }
848 assert(result.is_statically_bound(), "");
849 result.set_resolved_method_name(CHECK_(empty));
850 oop mname2 = init_method_MemberName(mname, result);
851 return Handle(THREAD, mname2);
852 }
853 case IS_FIELD:
854 {
855 fieldDescriptor result; // find_field initializes fd if found
856 {
857 assert(!HAS_PENDING_EXCEPTION, "");
858 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
859 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
860 if (HAS_PENDING_EXCEPTION) {
861 if (speculative_resolve) {
862 CLEAR_PENDING_EXCEPTION;
863 }
864 return empty;
865 }
866 }
867 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
868 return Handle(THREAD, mname2);
869 }
870 default:
871 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
872 }
873
874 return empty;
875 }
876
877 // Conversely, a member name which is only initialized from JVM internals
878 // may have null defc, name, and type fields.
879 // Resolving it plants a vmtarget/vmindex in it,
880 // which refers directly to JVM internals.
881 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
882 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
883
884 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
885 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
886 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
887 int flags = java_lang_invoke_MemberName::flags(mname());
888
889 if (suppress != 0) {
890 if (suppress & _suppress_defc) have_defc = true;
891 if (suppress & _suppress_name) have_name = true;
892 if (suppress & _suppress_type) have_type = true;
893 }
894
895 if (have_defc && have_name && have_type) return; // nothing needed
896
897 switch (flags & ALL_KINDS) {
898 case IS_METHOD:
899 case IS_CONSTRUCTOR:
900 {
901 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
902 if (vmtarget == NULL) {
903 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
904 }
905 methodHandle m(THREAD, vmtarget);
906 DEBUG_ONLY(vmtarget = NULL); // safety
907 if (!have_defc) {
908 InstanceKlass* defc = m->method_holder();
909 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
910 }
911 if (!have_name) {
912 //not java_lang_String::create_from_symbol; let's intern member names
913 oop name = StringTable::intern(m->name(), CHECK);
914 java_lang_invoke_MemberName::set_name(mname(), name);
915 }
916 if (!have_type) {
917 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
918 java_lang_invoke_MemberName::set_type(mname(), type());
919 }
920 return;
921 }
922 case IS_FIELD:
923 {
924 oop clazz = java_lang_invoke_MemberName::clazz(mname());
925 if (clazz == NULL) {
926 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
927 }
928 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
929 DEBUG_ONLY(clazz = NULL); // safety
930 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
931 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
932 fieldDescriptor fd; // find_field initializes fd if found
933 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
934 break; // cannot expand
935 if (!have_name) {
936 //not java_lang_String::create_from_symbol; let's intern member names
937 oop name = StringTable::intern(fd.name(), CHECK);
938 java_lang_invoke_MemberName::set_name(mname(), name);
939 }
940 if (!have_type) {
941 // If it is a primitive field type, don't mess with short strings like "I".
942 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
943 if (type.is_null()) {
944 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
945 }
946 java_lang_invoke_MemberName::set_type(mname(), type());
947 }
948 return;
949 }
950 }
951 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
952 }
953
954 int MethodHandles::find_MemberNames(Klass* k,
955 Symbol* name, Symbol* sig,
956 int mflags, Klass* caller,
957 int skip, objArrayHandle results, TRAPS) {
958 // %%% take caller into account!
959
960 Thread* thread = Thread::current();
961
962 if (k == NULL || !k->is_instance_klass()) return -1;
963
964 int rfill = 0, rlimit = results->length(), rskip = skip;
965 // overflow measurement:
966 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
967
968 int match_flags = mflags;
969 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
970 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
971 bool local_only = !(search_superc | search_intfc);
972 bool classes_only = false;
973
974 if (name != NULL) {
975 if (name->utf8_length() == 0) return 0; // a match is not possible
976 }
977 if (sig != NULL) {
978 if (sig->utf8_length() == 0) return 0; // a match is not possible
979 if (sig->byte_at(0) == '(')
980 match_flags &= ~(IS_FIELD | IS_TYPE);
981 else
982 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
983 }
984
985 if ((match_flags & IS_TYPE) != 0) {
986 // NYI, and Core Reflection works quite well for this query
987 }
988
989 if ((match_flags & IS_FIELD) != 0) {
990 InstanceKlass* ik = InstanceKlass::cast(k);
991 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
992 if (name != NULL && st.name() != name)
993 continue;
994 if (sig != NULL && st.signature() != sig)
995 continue;
996 // passed the filters
997 if (rskip > 0) {
998 --rskip;
999 } else if (rfill < rlimit) {
1000 Handle result(thread, results->obj_at(rfill++));
1001 if (!java_lang_invoke_MemberName::is_instance(result()))
1002 return -99; // caller bug!
1003 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
1004 if (!oopDesc::equals(saved, result()))
1005 results->obj_at_put(rfill-1, saved); // show saved instance to user
1006 } else if (++overflow >= overflow_limit) {
1007 match_flags = 0; break; // got tired of looking at overflow
1008 }
1009 }
1010 }
1011
1012 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
1013 // watch out for these guys:
1014 Symbol* init_name = vmSymbols::object_initializer_name();
1015 Symbol* clinit_name = vmSymbols::class_initializer_name();
1016 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
1017 bool negate_name_test = false;
1018 // fix name so that it captures the intention of IS_CONSTRUCTOR
1019 if (!(match_flags & IS_METHOD)) {
1020 // constructors only
1021 if (name == NULL) {
1022 name = init_name;
1023 } else if (name != init_name) {
1024 return 0; // no constructors of this method name
1025 }
1026 } else if (!(match_flags & IS_CONSTRUCTOR)) {
1027 // methods only
1028 if (name == NULL) {
1029 name = init_name;
1030 negate_name_test = true; // if we see the name, we *omit* the entry
1031 } else if (name == init_name) {
1032 return 0; // no methods of this constructor name
1033 }
1034 } else {
1035 // caller will accept either sort; no need to adjust name
1036 }
1037 InstanceKlass* ik = InstanceKlass::cast(k);
1038 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
1039 Method* m = st.method();
1040 Symbol* m_name = m->name();
1041 if (m_name == clinit_name)
1042 continue;
1043 if (name != NULL && ((m_name != name) ^ negate_name_test))
1044 continue;
1045 if (sig != NULL && m->signature() != sig)
1046 continue;
1047 // passed the filters
1048 if (rskip > 0) {
1049 --rskip;
1050 } else if (rfill < rlimit) {
1051 Handle result(thread, results->obj_at(rfill++));
1052 if (!java_lang_invoke_MemberName::is_instance(result()))
1053 return -99; // caller bug!
1054 CallInfo info(m, NULL, CHECK_0);
1055 oop saved = MethodHandles::init_method_MemberName(result, info);
1056 if (!oopDesc::equals(saved, result()))
1057 results->obj_at_put(rfill-1, saved); // show saved instance to user
1058 } else if (++overflow >= overflow_limit) {
1059 match_flags = 0; break; // got tired of looking at overflow
1060 }
1061 }
1062 }
1063
1064 // return number of elements we at leasted wanted to initialize
1065 return rfill + overflow;
1066 }
1067
1068 // Is it safe to remove stale entries from a dependency list?
1069 static bool safe_to_expunge() {
1070 // Since parallel GC threads can concurrently iterate over a dependency
1071 // list during safepoint, it is safe to remove entries only when
1072 // CodeCache lock is held.
1073 return CodeCache_lock->owned_by_self();
1074 }
1075
1076 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
1077 assert_locked_or_safepoint(CodeCache_lock);
1078
1079 oop context = java_lang_invoke_CallSite::context(call_site);
1080 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1081 // Try to purge stale entries on updates.
1082 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
1083 // in order to avoid memory leak, stale entries are purged whenever a dependency list
1084 // is changed (both on addition and removal). Though memory reclamation is delayed,
1085 // it avoids indefinite memory usage growth.
1086 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
1087 }
1088
1089 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
1090 assert_locked_or_safepoint(CodeCache_lock);
1091
1092 oop context = java_lang_invoke_CallSite::context(call_site);
1093 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1094 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
1095 }
1096
1097 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
1098 assert_lock_strong(Compile_lock);
1099
1100 int marked = 0;
1101 CallSiteDepChange changes(call_site, target);
1102 {
1103 NoSafepointVerifier nsv;
1104 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1105
1106 oop context = java_lang_invoke_CallSite::context(call_site());
1107 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1108 marked = deps.mark_dependent_nmethods(changes);
1109 }
1110 if (marked > 0) {
1111 // At least one nmethod has been marked for deoptimization.
1112 VM_Deoptimize op;
1113 VMThread::execute(&op);
1114 }
1115 }
1116
1117 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
1118 if (TraceMethodHandles) {
1119 const char* name = vmIntrinsics::name_at(iid);
1120 if (*name == '_') name += 1;
1121 const size_t len = strlen(name) + 50;
1122 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
1123 const char* suffix = "";
1124 if (is_signature_polymorphic(iid)) {
1125 if (is_signature_polymorphic_static(iid))
1126 suffix = "/static";
1127 else
1128 suffix = "/private";
1129 }
1130 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
1131 trace_method_handle(_masm, qname);
1132 // Note: Don't free the allocated char array because it's used
1133 // during runtime.
1134 }
1135 }
1136
1137 //
1138 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1139 // They are the private interface between this JVM and the HotSpot-specific
1140 // Java code that implements JSR 292 method handles.
1141 //
1142 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1143 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1144 //
1145
1146 #ifndef PRODUCT
1147 # ifndef ADVERTISE_CON_VALUES
1148 # define ADVERTISE_CON_VALUES
1149 # endif
1150 #endif
1151
1152 #ifdef ADVERTISE_CON_VALUES
1153 // The following macrology pushes a list of symbolic definitions,
1154 // all of integral type, up through getNamedCon, into the
1155 // verifyConstants method of jli.MethodHandleNatives.
1156 // In a debug build, and if the java -esa flag is thrown,
1157 // we make sure all of these names are kept in sync.
1158 #define EACH_NAMED_CON(template, requirement) \
1159 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1160 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1161 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1162 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1163 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1164 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1165 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1166 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1167 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1168 template(RefKind,REF_NONE) \
1169 template(RefKind,REF_getField) \
1170 template(RefKind,REF_getStatic) \
1171 template(RefKind,REF_putField) \
1172 template(RefKind,REF_putStatic) \
1173 template(RefKind,REF_invokeVirtual) \
1174 template(RefKind,REF_invokeStatic) \
1175 template(RefKind,REF_invokeSpecial) \
1176 template(RefKind,REF_newInvokeSpecial) \
1177 template(RefKind,REF_invokeInterface) \
1178 template(RefKind,REF_LIMIT) \
1179 template(ConstantPool,R_IFPRESENT) \
1180 template(ConstantPool,R_FORCE) \
1181 template(ConstantPool,R_SYMREF) \
1182 /*end*/
1183
1184 class RefKind {
1185 public:
1186 enum {
1187 REF_NONE = 0, // null value
1188 REF_getField = 1,
1189 REF_getStatic = 2,
1190 REF_putField = 3,
1191 REF_putStatic = 4,
1192 REF_invokeVirtual = 5,
1193 REF_invokeStatic = 6,
1194 REF_invokeSpecial = 7,
1195 REF_newInvokeSpecial = 8,
1196 REF_invokeInterface = 9,
1197 REF_LIMIT = 10
1198 };
1199 };
1200
1201 #define IGNORE_REQ(req_expr) /* req_expr */
1202 #define ONE_PLUS(scope,value) 1+
1203 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1204 #define VALUE_COMMA(scope,value) scope::value,
1205 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1206 #define STRING_NULL(scope,value) #value "\0"
1207 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1208
1209 static bool advertise_con_value(int which) {
1210 if (which < 0) return false;
1211 bool ok = true;
1212 int count = 0;
1213 #define INC_COUNT(scope,value) \
1214 ++count;
1215 #define CHECK_REQ(req_expr) \
1216 if (which < count) return ok; \
1217 ok = (req_expr);
1218 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1219 #undef INC_COUNT
1220 #undef CHECK_REQ
1221 assert(count == con_value_count, "");
1222 if (which < count) return ok;
1223 return false;
1224 }
1225
1226 #undef ONE_PLUS
1227 #undef VALUE_COMMA
1228 #undef STRING_NULL
1229 #undef EACH_NAMED_CON
1230
1231 #endif // ADVERTISE_CON_VALUES
1232
1233 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1234 #ifdef ADVERTISE_CON_VALUES
1235 if (advertise_con_value(which)) {
1236 assert(which >= 0 && which < con_value_count, "");
1237 int con = con_values[which];
1238 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1239 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1240 const char* str = &con_names[0];
1241 for (int i = 0; i < which; i++)
1242 str += strlen(str) + 1; // skip name and null
1243 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1244 box->obj_at_put(0, name);
1245 }
1246 return con;
1247 }
1248 #endif
1249 return 0;
1250 }
1251 JVM_END
1252
1253 // void init(MemberName self, AccessibleObject ref)
1254 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1255 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1256 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1257 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1258 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1259 MethodHandles::init_MemberName(mname, target, CHECK);
1260 }
1261 JVM_END
1262
1263 // void expand(MemberName self)
1264 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1265 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1266 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1267 MethodHandles::expand_MemberName(mname, 0, CHECK);
1268 }
1269 JVM_END
1270
1271 // void resolve(MemberName self, Class<?> caller)
1272 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1273 jboolean speculative_resolve)) {
1274 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1275 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1276
1277 // The trusted Java code that calls this method should already have performed
1278 // access checks on behalf of the given caller. But, we can verify this.
1279 if (VerifyMethodHandles && caller_jh != NULL &&
1280 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1281 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1282 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1283 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1284 }
1285
1286 // Reflection::verify_class_access can only handle instance classes.
1287 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1288 // Emulate LinkResolver::check_klass_accessability.
1289 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1290 if (caller != SystemDictionary::Object_klass()
1291 && Reflection::verify_class_access(caller,
1292 InstanceKlass::cast(reference_klass),
1293 true) != Reflection::ACCESS_OK) {
1294 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1295 }
1296 }
1297 }
1298
1299 Klass* caller = caller_jh == NULL ? NULL :
1300 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1301 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, speculative_resolve == JNI_TRUE,
1302 CHECK_NULL);
1303
1304 if (resolved.is_null()) {
1305 int flags = java_lang_invoke_MemberName::flags(mname());
1306 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1307 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1308 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1309 }
1310 if (speculative_resolve) {
1311 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1312 return NULL;
1313 }
1314 if ((flags & ALL_KINDS) == IS_FIELD) {
1315 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1316 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1317 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1318 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1319 } else {
1320 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1321 }
1322 }
1323
1324 return JNIHandles::make_local(THREAD, resolved());
1325 }
1326 JVM_END
1327
1328 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1329 if (mname == NULL ||
1330 java_lang_invoke_MemberName::clazz(mname) == NULL) {
1331 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1332 } else {
1333 int flags = java_lang_invoke_MemberName::flags(mname);
1334 if ((flags & IS_FIELD) != 0 &&
1335 (must_be_static
1336 ? (flags & JVM_ACC_STATIC) != 0
1337 : (flags & JVM_ACC_STATIC) == 0)) {
1338 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1339 return (jlong) vmindex;
1340 }
1341 }
1342 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1343 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1344 return 0;
1345 }
1346
1347 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1348 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1349 }
1350 JVM_END
1351
1352 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1353 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1354 }
1355 JVM_END
1356
1357 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1358 // use the other function to perform sanity checks:
1359 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1360 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1361 return JNIHandles::make_local(THREAD, clazz);
1362 }
1363 JVM_END
1364
1365 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1366 if (mname_jh == NULL) return NULL;
1367 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1368 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1369 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1370 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1371 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1372 result->obj_at_put(0, x);
1373
1374 int flags = java_lang_invoke_MemberName::flags(mname());
1375 if ((flags & IS_FIELD) != 0) {
1376 x = java_lang_invoke_MemberName::clazz(mname());
1377 } else {
1378 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1379 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1380 x = mname();
1381 }
1382 result->obj_at_put(1, x);
1383 return JNIHandles::make_local(env, result());
1384 }
1385 JVM_END
1386
1387
1388
1389 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1390 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1391 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1392 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1393 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1394 if (clazz_jh == NULL || results_jh == NULL) return -1;
1395 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1396
1397 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1398 if (results.is_null() || !results->is_objArray()) return -1;
1399
1400 TempNewSymbol name = NULL;
1401 TempNewSymbol sig = NULL;
1402 if (name_jh != NULL) {
1403 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1404 if (name == NULL) return 0; // a match is not possible
1405 }
1406 if (sig_jh != NULL) {
1407 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1408 if (sig == NULL) return 0; // a match is not possible
1409 }
1410
1411 Klass* caller = NULL;
1412 if (caller_jh != NULL) {
1413 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1414 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1415 caller = java_lang_Class::as_Klass(caller_oop);
1416 }
1417
1418 if (name != NULL && sig != NULL && results.not_null()) {
1419 // try a direct resolve
1420 // %%% TO DO
1421 }
1422
1423 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1424 caller, skip, results, CHECK_0);
1425 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1426 return res;
1427 }
1428 JVM_END
1429
1430 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1431 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1432 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1433 {
1434 // Walk all nmethods depending on this call site.
1435 MutexLocker mu(Compile_lock, thread);
1436 MethodHandles::flush_dependent_nmethods(call_site, target);
1437 java_lang_invoke_CallSite::set_target(call_site(), target());
1438 }
1439 }
1440 JVM_END
1441
1442 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1443 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1444 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1445 {
1446 // Walk all nmethods depending on this call site.
1447 MutexLocker mu(Compile_lock, thread);
1448 MethodHandles::flush_dependent_nmethods(call_site, target);
1449 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1450 }
1451 }
1452 JVM_END
1453
1454 // It is called by a Cleaner object which ensures that dropped CallSites properly
1455 // deallocate their dependency information.
1456 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1457 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1458 {
1459 // Walk all nmethods depending on this call site.
1460 MutexLocker mu1(Compile_lock, thread);
1461
1462 int marked = 0;
1463 {
1464 NoSafepointVerifier nsv;
1465 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1466 assert(safe_to_expunge(), "removal is not safe");
1467 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1468 marked = deps.remove_all_dependents();
1469 }
1470 if (marked > 0) {
1471 // At least one nmethod has been marked for deoptimization
1472 VM_Deoptimize op;
1473 VMThread::execute(&op);
1474 }
1475 }
1476 }
1477 JVM_END
1478
1479 /**
1480 * Throws a java/lang/UnsupportedOperationException unconditionally.
1481 * This is required by the specification of MethodHandle.invoke if
1482 * invoked directly.
1483 */
1484 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1485 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1486 return NULL;
1487 }
1488 JVM_END
1489
1490 /**
1491 * Throws a java/lang/UnsupportedOperationException unconditionally.
1492 * This is required by the specification of MethodHandle.invokeExact if
1493 * invoked directly.
1494 */
1495 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1496 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1497 return NULL;
1498 }
1499 JVM_END
1500
1501 /// JVM_RegisterMethodHandleMethods
1502
1503 #undef CS // Solaris builds complain
1504
1505 #define LANG "Ljava/lang/"
1506 #define JLINV "Ljava/lang/invoke/"
1507
1508 #define OBJ LANG "Object;"
1509 #define CLS LANG "Class;"
1510 #define STRG LANG "String;"
1511 #define CS JLINV "CallSite;"
1512 #define MT JLINV "MethodType;"
1513 #define MH JLINV "MethodHandle;"
1514 #define MEM JLINV "MemberName;"
1515 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1516
1517 #define CC (char*) /*cast a literal from (const char*)*/
1518 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1519
1520 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1521 static JNINativeMethod MHN_methods[] = {
1522 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1523 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1524 {CC "resolve", CC "(" MEM "" CLS "Z)" MEM, FN_PTR(MHN_resolve_Mem)},
1525 // static native int getNamedCon(int which, Object[] name)
1526 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1527 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1528 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1529 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1530 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1531 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1532 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1533 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1534 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1535 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1536 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1537 };
1538
1539 static JNINativeMethod MH_methods[] = {
1540 // UnsupportedOperationException throwers
1541 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1542 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1543 };
1544
1545 /**
1546 * This one function is exported, used by NativeLookup.
1547 */
1548 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1549 assert(!MethodHandles::enabled(), "must not be enabled");
1550 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1551
1552 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1553 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1554
1555 {
1556 ThreadToNativeFromVM ttnfv(thread);
1557
1558 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1559 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1560 "register java.lang.invoke.MethodHandleNative natives");
1561
1562 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1563 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1564 "register java.lang.invoke.MethodHandle natives");
1565 }
1566
1567 if (TraceInvokeDynamic) {
1568 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1569 }
1570
1571 MethodHandles::set_enabled(true);
1572 }
1573 JVM_END