1 /*
2 * Copyright (c) 2008, 2026, 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 "classfile/javaClasses.inline.hpp"
26 #include "classfile/stringTable.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmClasses.hpp"
30 #include "code/codeCache.hpp"
31 #include "code/dependencyContext.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "interpreter/oopMapCache.hpp"
36 #include "jvm_io.h"
37 #include "logging/log.hpp"
38 #include "logging/logStream.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "memory/resourceArea.hpp"
42 #include "memory/universe.hpp"
43 #include "oops/klass.inline.hpp"
44 #include "oops/objArrayKlass.hpp"
45 #include "oops/objArrayOop.inline.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "oops/typeArrayOop.inline.hpp"
48 #include "prims/methodHandles.hpp"
49 #include "runtime/deoptimization.hpp"
50 #include "runtime/fieldDescriptor.inline.hpp"
51 #include "runtime/handles.inline.hpp"
52 #include "runtime/interfaceSupport.inline.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/jniHandles.inline.hpp"
55 #include "runtime/reflection.hpp"
56 #include "runtime/safepointVerifiers.hpp"
57 #include "runtime/signature.hpp"
58 #include "runtime/stubRoutines.hpp"
59 #include "runtime/timerTrace.hpp"
60 #include "sanitizers/leak.hpp"
61 #include "utilities/exceptions.hpp"
62
63
64 /*
65 * JSR 292 reference implementation: method handles
66 * The JDK 7 reference implementation represented method handle
67 * combinations as chains. Each link in the chain had a "vmentry"
68 * field which pointed at a bit of assembly code which performed
69 * one transformation before dispatching to the next link in the chain.
70 *
71 * The current reference implementation pushes almost all code generation
72 * responsibility to (trusted) Java code. A method handle contains a
73 * pointer to its "LambdaForm", which embodies all details of the method
74 * handle's behavior. The LambdaForm is a normal Java object, managed
75 * by a runtime coded in Java.
76 */
77
78 bool MethodHandles::_enabled = false; // set true after successful native linkage
79 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = nullptr;
80
81 /**
82 * Generates method handle adapters. Returns 'false' if memory allocation
83 * failed and true otherwise.
84 */
85 void MethodHandles::generate_adapters() {
86 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
87 assert(_adapter_code == nullptr, "generate only once");
88
89 ResourceMark rm;
90 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
91 // The adapter entry is required to be aligned to CodeEntryAlignment.
92 // So we need additional bytes due to alignment.
93 int adapter_num = (int)Interpreter::method_handle_invoke_LAST - (int)Interpreter::method_handle_invoke_FIRST + 1;
94 int max_aligned_bytes = adapter_num * CodeEntryAlignment;
95 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size + max_aligned_bytes);
96 CodeBuffer code(_adapter_code);
97 MethodHandlesAdapterGenerator g(&code);
98 g.generate();
99 code.log_section_sizes("MethodHandlesAdapterBlob");
100 }
101
102 //------------------------------------------------------------------------------
103 // MethodHandlesAdapterGenerator::generate
104 //
105 void MethodHandlesAdapterGenerator::generate() {
106 // Generate generic method handle adapters.
107 // Generate interpreter entries
108 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
109 mk <= Interpreter::method_handle_invoke_LAST;
110 mk = Interpreter::MethodKind(1 + (int)mk)) {
111 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
112 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
113 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
114 if (entry != nullptr) {
115 Interpreter::set_entry_for_kind(mk, entry);
116 }
117 // If the entry is not set, it will throw AbstractMethodError.
118 }
119 }
120
121 void MethodHandles::set_enabled(bool z) {
122 if (_enabled != z) {
123 guarantee(z, "can only enable once");
124 _enabled = z;
125 }
126 }
127
128 // MemberName support
129
130 // import java_lang_invoke_MemberName.*
131 enum {
132 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
133 IS_OBJECT_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_OBJECT_CONSTRUCTOR,
134 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
135 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
136 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
137 TRUSTED_FINAL = java_lang_invoke_MemberName::MN_TRUSTED_FINAL,
138 HIDDEN_MEMBER = java_lang_invoke_MemberName::MN_HIDDEN_MEMBER,
139 NULL_RESTRICTED = java_lang_invoke_MemberName::MN_NULL_RESTRICTED_FIELD,
140 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
141 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
142 LAYOUT_SHIFT = java_lang_invoke_MemberName::MN_LAYOUT_SHIFT,
143 LAYOUT_MASK = java_lang_invoke_MemberName::MN_LAYOUT_MASK,
144 LM_UNCONDITIONAL = java_lang_invoke_MemberName::MN_UNCONDITIONAL_MODE,
145 LM_MODULE = java_lang_invoke_MemberName::MN_MODULE_MODE,
146 LM_TRUSTED = java_lang_invoke_MemberName::MN_TRUSTED_MODE,
147 ALL_KINDS = IS_METHOD | IS_OBJECT_CONSTRUCTOR | IS_FIELD | IS_TYPE
148 };
149
150 int MethodHandles::ref_kind_to_flags(int ref_kind) {
151 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
152 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
153 if (ref_kind_is_field(ref_kind)) {
154 flags |= IS_FIELD;
155 } else if (ref_kind_is_method(ref_kind)) {
156 flags |= IS_METHOD;
157 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
158 flags |= IS_OBJECT_CONSTRUCTOR;
159 }
160 return flags;
161 }
162
163 #ifdef ASSERT
164 const char* MethodHandles::ref_kind_to_verify_msg(int ref_kind) {
165 switch (ref_kind) {
166 case JVM_REF_invokeSpecial: return "verify_ref_kind expected invokeSpecial";
167 case JVM_REF_invokeStatic: return "verify_ref_kind expected invokeStatic";
168 case JVM_REF_invokeVirtual: return "verify_ref_kind expected invokeVirtual";
169 case JVM_REF_invokeInterface: return "verify_ref_kind expected invokeInterface";
170 default: assert(false, "unexpected ref_kind: %d", ref_kind);
171 }
172 return "";
173 }
174 #endif
175
176 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
177 Handle empty;
178 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
179 if (!java_lang_String::is_instance(type())) {
180 return type; // already resolved
181 }
182 Symbol* signature = java_lang_String::as_symbol_or_null(type());
183 if (signature == nullptr) {
184 return empty; // no such signature exists in the VM
185 }
186 Handle resolved;
187 int flags = java_lang_invoke_MemberName::flags(mname());
188 switch (flags & ALL_KINDS) {
189 case IS_METHOD:
190 case IS_OBJECT_CONSTRUCTOR:
191 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
192 break;
193 case IS_FIELD:
194 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
195 break;
196 default:
197 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
198 }
199 if (resolved.is_null()) {
200 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
201 }
202 return resolved;
203 }
204
205 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
206 // This method is used from java.lang.invoke.MemberName constructors.
207 // It fills in the new MemberName from a java.lang.reflect.Member.
208 oop target_oop = target();
209 Klass* target_klass = target_oop->klass();
210 if (target_klass == vmClasses::reflect_Field_klass()) {
211 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
212 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
213 Klass* k = java_lang_Class::as_Klass(clazz);
214 if (k != nullptr && k->is_instance_klass()) {
215 fieldDescriptor fd(InstanceKlass::cast(k), slot);
216 oop mname2 = init_field_MemberName(mname, fd);
217 if (mname2 != nullptr) {
218 // Since we have the reified name and type handy, add them to the result.
219 if (java_lang_invoke_MemberName::name(mname2) == nullptr)
220 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
221 if (java_lang_invoke_MemberName::type(mname2) == nullptr)
222 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
223 }
224 return mname2;
225 }
226 } else if (target_klass == vmClasses::reflect_Method_klass()) {
227 oop clazz = java_lang_reflect_Method::clazz(target_oop);
228 int slot = java_lang_reflect_Method::slot(target_oop);
229 Klass* k = java_lang_Class::as_Klass(clazz);
230 if (k != nullptr && k->is_instance_klass()) {
231 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
232 if (m == nullptr || is_signature_polymorphic(m->intrinsic_id()))
233 return nullptr; // do not resolve unless there is a concrete signature
234 CallInfo info(m, k, CHECK_NULL);
235 return init_method_MemberName(mname, info);
236 }
237 } else if (target_klass == vmClasses::reflect_Constructor_klass()) {
238 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
239 int slot = java_lang_reflect_Constructor::slot(target_oop);
240 Klass* k = java_lang_Class::as_Klass(clazz);
241 if (k != nullptr && k->is_instance_klass()) {
242 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
243 if (m == nullptr) return nullptr;
244 CallInfo info(m, k, CHECK_NULL);
245 return init_method_MemberName(mname, info);
246 }
247 }
248 return nullptr;
249 }
250
251 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
252 assert(info.resolved_appendix().is_null(), "only normal methods here");
253 methodHandle m(Thread::current(), info.resolved_method());
254 assert(m.not_null(), "null method handle");
255 InstanceKlass* m_klass = m->method_holder();
256 assert(m_klass != nullptr, "null holder for method handle");
257 int flags = (m->access_flags().as_method_flags());
258 int vmindex = Method::invalid_vtable_index;
259 LogTarget(Debug, methodhandles, indy) lt_indy;
260
261 switch (info.call_kind()) {
262 case CallInfo::itable_call:
263 vmindex = info.itable_index();
264 // More importantly, the itable index only works with the method holder.
265 assert(m_klass->verify_itable_index(vmindex), "");
266 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
267 if (lt_indy.is_enabled()) {
268 ResourceMark rm;
269 LogStream ls(lt_indy);
270 ls.print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
271 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
272 vmindex);
273 m->access_flags().print_on(&ls);
274 if (!m->is_abstract()) {
275 if (!m->is_private()) {
276 ls.print("default");
277 }
278 else {
279 ls.print("private-intf");
280 }
281 }
282 ls.cr();
283 }
284 break;
285
286 case CallInfo::vtable_call:
287 vmindex = info.vtable_index();
288 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
289 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
290 if (m_klass->is_interface()) {
291 // This is a vtable call to an interface method (abstract "miranda method" or default method).
292 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
293 // (LinkResolver should help us figure this out.)
294 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass");
295 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass());
296 if (m_klass_non_interface->is_interface()) {
297 m_klass_non_interface = vmClasses::Object_klass();
298 #ifdef ASSERT
299 { ResourceMark rm;
300 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
301 assert(m->name() == m2->name() && m->signature() == m2->signature(),
302 "at %d, %s != %s", vmindex,
303 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
304 }
305 #endif //ASSERT
306 }
307 if (!m->is_public()) {
308 assert(m->is_public(), "virtual call must be to public interface method");
309 return nullptr; // elicit an error later in product build
310 }
311 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
312 m_klass = m_klass_non_interface;
313 }
314 if (lt_indy.is_enabled()) {
315 ResourceMark rm;
316 LogStream ls(lt_indy);
317 ls.print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
318 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
319 m_klass->internal_name(), vmindex);
320 m->access_flags().print_on(&ls);
321 if (m->is_default_method()) {
322 ls.print("default");
323 }
324 ls.cr();
325 }
326 break;
327
328 case CallInfo::direct_call:
329 vmindex = Method::nonvirtual_vtable_index;
330 if (m->is_static()) {
331 assert(!m->is_class_initializer(), "Cannot be static initializer");
332 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
333 } else if (m->is_object_constructor()) {
334 flags |= IS_OBJECT_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
335 } else {
336 // "special" reflects that this is a direct call, not that it
337 // necessarily originates from an invokespecial. We can also do
338 // direct calls for private and/or final non-static methods.
339 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
340 }
341 break;
342
343 default: assert(false, "bad CallInfo"); return nullptr;
344 }
345
346 // @CallerSensitive annotation detected
347 if (m->caller_sensitive()) {
348 flags |= CALLER_SENSITIVE;
349 }
350
351 Handle resolved_method = info.resolved_method_name();
352 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(),
353 "Should not change after link resolution");
354
355 oop mname_oop = mname();
356 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
357 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
358 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
359 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
360 // Note: name and type can be lazily computed by resolve_MemberName,
361 // if Java code needs them as resolved String and MethodType objects.
362 // If relevant, the vtable or itable value is stored as vmindex.
363 // This is done eagerly, since it is readily available without
364 // constructing any new objects.
365 return mname();
366 }
367
368 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
369 InstanceKlass* ik = fd.field_holder();
370 int flags = fd.access_flags().as_field_flags();
371 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
372 if (fd.is_trusted_final()) flags |= TRUSTED_FINAL;
373 if (fd.is_flat()) {
374 int layout_kind = (int)fd.layout_kind();
375 assert((layout_kind & LAYOUT_MASK) == layout_kind, "Layout information loss");
376 flags |= layout_kind << LAYOUT_SHIFT;
377 }
378 if (fd.is_null_free_inline_type()) flags |= NULL_RESTRICTED;
379 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
380 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
381
382 oop mname_oop = mname();
383 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
384 java_lang_invoke_MemberName::set_method (mname_oop, nullptr);
385 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
386 java_lang_invoke_MemberName::set_clazz (mname_oop, ik->java_mirror());
387
388 oop type = field_signature_type_or_null(fd.signature());
389 oop name = field_name_or_null(fd.name());
390 if (name != nullptr)
391 java_lang_invoke_MemberName::set_name(mname_oop, name);
392 if (type != nullptr)
393 java_lang_invoke_MemberName::set_type(mname_oop, type);
394 // Note: name and type can be lazily computed by resolve_MemberName,
395 // if Java code needs them as resolved String and Class objects.
396 // Note that the incoming type oop might be pre-resolved (non-null).
397 // The base clazz and field offset (vmindex) must be eagerly stored,
398 // because they unambiguously identify the field.
399 // Although the fieldDescriptor::_index would also identify the field,
400 // we do not use it, because it is harder to decode.
401 // TO DO: maybe intern mname_oop
402 return mname();
403 }
404
405 // JVM 2.9 Special Methods:
406 // A method is signature polymorphic if and only if all of the following conditions hold :
407 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
408 // * It has a single formal parameter of type Object[].
409 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
410 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
411 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
412 if (klass == nullptr)
413 return false;
414 // The following test will fail spuriously during bootstrap of MethodHandle itself:
415 // if (klass != vmClasses::MethodHandle_klass())
416 // Test the name instead:
417 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
418 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
419 return false;
420 }
421
422 // Look up signature polymorphic method with polymorphic return type
423 Symbol* poly_sig = vmSymbols::object_array_object_signature();
424 InstanceKlass* iklass = InstanceKlass::cast(klass);
425 Method* m = iklass->find_method(name, poly_sig);
426 if (m != nullptr) {
427 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
428 int flags = m->access_flags().as_method_flags();
429 if ((flags & required) == required) {
430 return true;
431 }
432 }
433
434 // Look up signature polymorphic method with non-polymorphic (non Object) return type
435 int me;
436 int ms = iklass->find_method_by_name(name, &me);
437 if (ms == -1) return false;
438 for (; ms < me; ms++) {
439 Method* m = iklass->methods()->at(ms);
440 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
441 int flags = m->access_flags().as_method_flags();
442 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
443 return true;
444 }
445 }
446 return false;
447 }
448
449
450 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
451 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
452 switch (iid) {
453 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
454 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
455 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
456 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
457 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
458 case vmIntrinsics::_linkToNative: return vmSymbols::linkToNative_name();
459 default:
460 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
461 }
462 }
463
464 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
465 switch(id) {
466 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
467 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
468 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
469 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
470 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
471 default:
472 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
473 }
474 }
475
476 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
477 switch (iid) {
478 case vmIntrinsics::_invokeBasic: return 0;
479 case vmIntrinsics::_linkToNative: return 0;
480 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
481 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
482 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
483 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
484 default:
485 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
486 }
487 }
488
489 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
490 vmSymbolID name_id = vmSymbols::find_sid(name);
491 switch (name_id) {
492 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
493 case VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
494 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
495 case VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
496
497 // There is one static signature-polymorphic method for each JVM invocation mode.
498 case VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
499 case VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
500 case VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
501 case VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
502 case VM_SYMBOL_ENUM_NAME(linkToNative_name): return vmIntrinsics::_linkToNative;
503 default: break;
504 }
505
506 // Cover the case of invokeExact and any future variants of invokeFoo.
507 Klass* mh_klass = vmClasses::klass_at(VM_CLASS_ID(MethodHandle_klass));
508 if (mh_klass != nullptr && is_method_handle_invoke_name(mh_klass, name)) {
509 return vmIntrinsics::_invokeGeneric;
510 }
511
512 // Cover the case of methods on VarHandle.
513 Klass* vh_klass = vmClasses::klass_at(VM_CLASS_ID(VarHandle_klass));
514 if (vh_klass != nullptr && is_method_handle_invoke_name(vh_klass, name)) {
515 return vmIntrinsics::_invokeGeneric;
516 }
517
518 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
519 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
520 return vmIntrinsics::_none;
521 }
522
523 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
524 if (klass != nullptr &&
525 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
526 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
527 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
528 if (iid != vmIntrinsics::_none)
529 return iid;
530 if (is_method_handle_invoke_name(klass, name))
531 return vmIntrinsics::_invokeGeneric;
532 }
533 return vmIntrinsics::_none;
534 }
535
536 // Returns true if method is signature polymorphic and public
537 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
538 if (is_signature_polymorphic_name(klass, name)) {
539 InstanceKlass* iklass = InstanceKlass::cast(klass);
540 int me;
541 int ms = iklass->find_method_by_name(name, &me);
542 assert(ms != -1, "");
543 for (; ms < me; ms++) {
544 Method* m = iklass->methods()->at(ms);
545 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
546 int flags = m->access_flags().as_method_flags();
547 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
548 return true;
549 }
550 }
551 }
552 return false;
553 }
554
555 // convert the external string or reflective type to an internal signature
556 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
557 if (java_lang_invoke_MethodType::is_instance(type_str)) {
558 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
559 } else if (java_lang_Class::is_instance(type_str)) {
560 return java_lang_Class::as_signature(type_str, false);
561 } else if (java_lang_String::is_instance(type_str)) {
562 if (intern_if_not_found) {
563 return java_lang_String::as_symbol(type_str);
564 } else {
565 return java_lang_String::as_symbol_or_null(type_str);
566 }
567 } else {
568 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", nullptr);
569 }
570 }
571
572 static const char OBJ_SIG[] = "Ljava/lang/Object;";
573 enum { OBJ_SIG_LEN = 18 };
574
575 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
576 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
577 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
578 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) {
579 switch (ss.type()) {
580 case T_OBJECT:
581 // only java/lang/Object is valid here
582 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, ss.raw_length()) != 0)
583 return false;
584 break;
585 case T_VOID:
586 case T_INT:
587 case T_LONG:
588 case T_FLOAT:
589 case T_DOUBLE:
590 break;
591 default:
592 // subword types (T_BYTE etc.), Q-descriptors, arrays
593 return false;
594 }
595 }
596 return true;
597 }
598
599 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg) {
600 Symbol* bsig = nullptr;
601 if (sig == nullptr) {
602 return sig;
603 } else if (is_basic_type_signature(sig)) {
604 sig->increment_refcount();
605 return sig; // that was easy
606 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) {
607 BasicType bt = Signature::basic_type(sig);
608 if (is_subword_type(bt)) {
609 bsig = vmSymbols::int_signature();
610 } else {
611 assert(is_reference_type(bt), "is_basic_type_signature was false");
612 bsig = vmSymbols::object_signature();
613 }
614 } else {
615 ResourceMark rm;
616 stringStream buffer(128);
617 buffer.put(JVM_SIGNATURE_FUNC);
618 int arg_pos = 0, keep_arg_pos = -1;
619 if (keep_last_arg)
620 keep_arg_pos = ArgumentCount(sig).size() - 1;
621 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
622 BasicType bt = ss.type();
623 size_t this_arg_pos = buffer.size();
624 if (ss.at_return_type()) {
625 buffer.put(JVM_SIGNATURE_ENDFUNC);
626 }
627 if (arg_pos == keep_arg_pos) {
628 buffer.write((char*) ss.raw_bytes(),
629 (int) ss.raw_length());
630 } else if (is_reference_type(bt)) {
631 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
632 } else {
633 if (is_subword_type(bt))
634 bt = T_INT;
635 buffer.put(type2char(bt));
636 }
637 arg_pos++;
638 }
639 const char* sigstr = buffer.base();
640 int siglen = (int) buffer.size();
641 bsig = SymbolTable::new_symbol(sigstr, siglen);
642 }
643 assert(is_basic_type_signature(bsig) ||
644 // detune assert in case the injected argument is not a basic type:
645 keep_last_arg, "");
646 return bsig;
647 }
648
649 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
650 Symbol* sig) {
651 st = st ? st : tty;
652 bool prev_type = false;
653 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC);
654 if (is_method) st->put(JVM_SIGNATURE_FUNC);
655 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
656 if (ss.at_return_type())
657 st->put(JVM_SIGNATURE_ENDFUNC);
658 else if (prev_type)
659 st->put(',');
660 const char* cp = (const char*) ss.raw_bytes();
661 if (ss.is_array()) {
662 st->put(JVM_SIGNATURE_ARRAY);
663 if (ss.array_prefix_length() == 1)
664 st->put(cp[1]);
665 else
666 st->put(JVM_SIGNATURE_CLASS);
667 } else {
668 st->put(cp[0]);
669 }
670 }
671 }
672
673
674
675 static oop object_java_mirror() {
676 return vmClasses::Object_klass()->java_mirror();
677 }
678
679 oop MethodHandles::field_name_or_null(Symbol* s) {
680 if (s == nullptr) return nullptr;
681 return StringTable::lookup(s);
682 }
683
684 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
685 if (s == nullptr) return nullptr;
686 BasicType bt = Signature::basic_type(s);
687 if (is_java_primitive(bt)) {
688 assert(s->utf8_length() == 1, "");
689 return java_lang_Class::primitive_mirror(bt);
690 }
691 // Here are some more short cuts for common types.
692 // They are optional, since reference types can be resolved lazily.
693 if (bt == T_OBJECT) {
694 if (s == vmSymbols::object_signature()) {
695 return object_java_mirror();
696 } else if (s == vmSymbols::class_signature()) {
697 return vmClasses::Class_klass()->java_mirror();
698 } else if (s == vmSymbols::string_signature()) {
699 return vmClasses::String_klass()->java_mirror();
700 }
701 }
702 return nullptr;
703 }
704
705 // An unresolved member name is a mere symbolic reference.
706 // Resolving it plants a vmtarget/vmindex in it,
707 // which refers directly to JVM internals.
708 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, int lookup_mode,
709 bool speculative_resolve, TRAPS) {
710 Handle empty;
711 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
712
713 if (java_lang_invoke_MemberName::vmtarget(mname()) != nullptr) {
714 // Already resolved.
715 DEBUG_ONLY(intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()));
716 assert(vmindex >= Method::nonvirtual_vtable_index, "");
717 return mname;
718 }
719
720 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
721 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
722 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
723 int flags = java_lang_invoke_MemberName::flags(mname());
724 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
725 if (!ref_kind_is_valid(ref_kind)) {
726 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
727 }
728
729 DEBUG_ONLY(intptr_t old_vmindex);
730 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
731
732 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
733 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
734 }
735
736 InstanceKlass* defc = nullptr;
737 {
738 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
739 if (defc_klass == nullptr) return empty; // a primitive; no resolution possible
740 if (!defc_klass->is_instance_klass()) {
741 if (!defc_klass->is_array_klass()) return empty;
742 defc_klass = vmClasses::Object_klass();
743 }
744 defc = InstanceKlass::cast(defc_klass);
745 }
746 if (defc == nullptr) {
747 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
748 }
749 defc->link_class(CHECK_(empty)); // possible safepoint
750
751 // convert the external string name to an internal symbol
752 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
753 if (name == nullptr) return empty; // no such name
754 if (name == vmSymbols::class_initializer_name())
755 return empty; // illegal name
756
757 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
758 if ((flags & ALL_KINDS) == IS_METHOD &&
759 (defc == vmClasses::MethodHandle_klass() || defc == vmClasses::VarHandle_klass()) &&
760 (ref_kind == JVM_REF_invokeVirtual ||
761 ref_kind == JVM_REF_invokeSpecial ||
762 // static invocation mode is required for _linkToVirtual, etc.:
763 ref_kind == JVM_REF_invokeStatic)) {
764 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
765 if (iid != vmIntrinsics::_none &&
766 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
767 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
768 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
769 mh_invoke_id = iid;
770 }
771 }
772
773 // convert the external string or reflective type to an internal signature
774 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
775 if (type == nullptr) return empty; // no such signature exists in the VM
776
777 // skip access check if it's trusted lookup
778 LinkInfo::AccessCheck access_check = caller != nullptr ?
779 LinkInfo::AccessCheck::required :
780 LinkInfo::AccessCheck::skip;
781 // skip loader constraints if it's trusted lookup or a public lookup
782 LinkInfo::LoaderConstraintCheck loader_constraint_check = (caller != nullptr && (lookup_mode & LM_UNCONDITIONAL) == 0) ?
783 LinkInfo::LoaderConstraintCheck::required :
784 LinkInfo::LoaderConstraintCheck::skip;
785
786 // Time to do the lookup.
787 switch (flags & ALL_KINDS) {
788 case IS_METHOD:
789 {
790 CallInfo result;
791 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
792 {
793 assert(!HAS_PENDING_EXCEPTION, "");
794 if (ref_kind == JVM_REF_invokeStatic) {
795 LinkResolver::resolve_static_call(result,
796 link_info, ClassInitMode::dont_init, THREAD);
797 } else if (ref_kind == JVM_REF_invokeInterface) {
798 LinkResolver::resolve_interface_call(result, Handle(), defc,
799 link_info, false, THREAD);
800 } else if (mh_invoke_id != vmIntrinsics::_none) {
801 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
802 LinkResolver::resolve_handle_call(result, link_info, THREAD);
803 } else if (ref_kind == JVM_REF_invokeSpecial) {
804 LinkResolver::resolve_special_call(result, Handle(),
805 link_info, THREAD);
806 } else if (ref_kind == JVM_REF_invokeVirtual) {
807 LinkResolver::resolve_virtual_call(result, Handle(), defc,
808 link_info, false, THREAD);
809 } else {
810 assert(false, "ref_kind=%d", ref_kind);
811 }
812 if (HAS_PENDING_EXCEPTION) {
813 if (speculative_resolve) {
814 CLEAR_PENDING_EXCEPTION;
815 }
816 return empty;
817 }
818 }
819 if (result.resolved_appendix().not_null()) {
820 // The resolved MemberName must not be accompanied by an appendix argument,
821 // since there is no way to bind this value into the MemberName.
822 // Caller is responsible to prevent this from happening.
823 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
824 }
825 result.set_resolved_method_name(CHECK_(empty));
826 oop mname2 = init_method_MemberName(mname, result);
827 return Handle(THREAD, mname2);
828 }
829 case IS_OBJECT_CONSTRUCTOR:
830 {
831 CallInfo result;
832 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
833 {
834 assert(!HAS_PENDING_EXCEPTION, "");
835 if (name == vmSymbols::object_initializer_name() && type->is_void_method_signature()) {
836 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
837 } else {
838 break; // will throw after end of switch
839 }
840 if (HAS_PENDING_EXCEPTION) {
841 if (speculative_resolve) {
842 CLEAR_PENDING_EXCEPTION;
843 }
844 return empty;
845 }
846 }
847 assert(result.is_statically_bound(), "");
848 result.set_resolved_method_name(CHECK_(empty));
849 oop mname2 = init_method_MemberName(mname, result);
850 return Handle(THREAD, mname2);
851 }
852 case IS_FIELD:
853 {
854 fieldDescriptor result; // find_field initializes fd if found
855 {
856 assert(!HAS_PENDING_EXCEPTION, "");
857 LinkInfo link_info(defc, name, type, caller, LinkInfo::AccessCheck::skip, loader_constraint_check);
858 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, ClassInitMode::dont_init, THREAD);
859 if (HAS_PENDING_EXCEPTION) {
860 if (speculative_resolve) {
861 CLEAR_PENDING_EXCEPTION;
862 }
863 return empty;
864 }
865 }
866 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
867 return Handle(THREAD, mname2);
868 }
869 default:
870 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
871 }
872
873 return empty;
874 }
875
876 // Conversely, a member name which is only initialized from JVM internals
877 // may have null defc, name, and type fields.
878 // Resolving it plants a vmtarget/vmindex in it,
879 // which refers directly to JVM internals.
880 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
881 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
882
883 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != nullptr);
884 bool have_name = (java_lang_invoke_MemberName::name(mname()) != nullptr);
885 bool have_type = (java_lang_invoke_MemberName::type(mname()) != nullptr);
886 int flags = java_lang_invoke_MemberName::flags(mname());
887
888 if (suppress != 0) {
889 if (suppress & _suppress_defc) have_defc = true;
890 if (suppress & _suppress_name) have_name = true;
891 if (suppress & _suppress_type) have_type = true;
892 }
893
894 if (have_defc && have_name && have_type) return; // nothing needed
895
896 switch (flags & ALL_KINDS) {
897 case IS_METHOD:
898 case IS_OBJECT_CONSTRUCTOR:
899 {
900 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
901 if (vmtarget == nullptr) {
902 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
903 }
904 methodHandle m(THREAD, vmtarget);
905 DEBUG_ONLY(vmtarget = nullptr); // safety
906 if (!have_defc) {
907 InstanceKlass* defc = m->method_holder();
908 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
909 }
910 if (!have_name) {
911 //not java_lang_String::create_from_symbol; let's intern member names
912 oop name = StringTable::intern(m->name(), CHECK);
913 java_lang_invoke_MemberName::set_name(mname(), name);
914 }
915 if (!have_type) {
916 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
917 java_lang_invoke_MemberName::set_type(mname(), type());
918 }
919 return;
920 }
921 case IS_FIELD:
922 {
923 oop clazz = java_lang_invoke_MemberName::clazz(mname());
924 if (clazz == nullptr) {
925 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
926 }
927 InstanceKlass* defc = java_lang_Class::as_InstanceKlass(clazz);
928 DEBUG_ONLY(clazz = nullptr); // safety
929 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
930 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
931 fieldDescriptor fd; // find_field initializes fd if found
932 if (!defc->find_field_from_offset(checked_cast<int>(vmindex), is_static, &fd))
933 break; // cannot expand
934 if (!have_name) {
935 //not java_lang_String::create_from_symbol; let's intern member names
936 oop name = StringTable::intern(fd.name(), CHECK);
937 java_lang_invoke_MemberName::set_name(mname(), name);
938 }
939 if (!have_type) {
940 // If it is a primitive field type, don't mess with short strings like "I".
941 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
942 if (type.is_null()) {
943 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
944 }
945 java_lang_invoke_MemberName::set_type(mname(), type());
946 }
947 return;
948 }
949 }
950 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
951 }
952
953 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
954 assert_lock_strong(CodeCache_lock);
955 DependencyContext deps = java_lang_invoke_CallSite::vmdependencies(call_site);
956 deps.add_dependent_nmethod(nm);
957 }
958
959 void MethodHandles::clean_dependency_context(oop call_site) {
960 DependencyContext deps = java_lang_invoke_CallSite::vmdependencies(call_site);
961 deps.clean_unloading_dependents();
962 }
963
964 void MethodHandles::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, Handle call_site, Handle target) {
965 assert_lock_strong(Compile_lock);
966
967 CallSiteDepChange changes(call_site, target);
968 {
969 NoSafepointVerifier nsv;
970 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
971
972 DependencyContext deps = java_lang_invoke_CallSite::vmdependencies(call_site());
973 deps.mark_dependent_nmethods(deopt_scope, changes);
974 }
975 }
976
977 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
978 if (log_is_enabled(Info, methodhandles)) {
979 const char* name = vmIntrinsics::name_at(iid);
980 if (*name == '_') name += 1;
981 const size_t len = strlen(name) + 50;
982 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
983 const char* suffix = "";
984 if (is_signature_polymorphic(iid)) {
985 if (is_signature_polymorphic_static(iid))
986 suffix = "/static";
987 else
988 suffix = "/private";
989 }
990 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
991 trace_method_handle(_masm, qname);
992 // LSan appears unable to keep track of qname, ignore it.
993 LSAN_IGNORE_OBJECT(qname);
994 // Note: Don't free the allocated char array because it's used
995 // during runtime.
996 }
997 }
998
999 //
1000 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1001 // They are the private interface between this JVM and the HotSpot-specific
1002 // Java code that implements JSR 292 method handles.
1003 //
1004 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1005 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1006 //
1007
1008 #ifndef PRODUCT
1009 #define EACH_NAMED_CON(template, requirement) \
1010 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1011 template(java_lang_invoke_MemberName,MN_IS_OBJECT_CONSTRUCTOR) \
1012 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1013 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1014 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1015 template(java_lang_invoke_MemberName,MN_TRUSTED_FINAL) \
1016 template(java_lang_invoke_MemberName,MN_HIDDEN_MEMBER) \
1017 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1018 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1019 template(java_lang_invoke_MemberName,MN_LAYOUT_SHIFT) \
1020 template(java_lang_invoke_MemberName,MN_LAYOUT_MASK) \
1021 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \
1022 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \
1023 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \
1024 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \
1025 template(java_lang_invoke_MemberName,MN_MODULE_MODE) \
1026 template(java_lang_invoke_MemberName,MN_UNCONDITIONAL_MODE) \
1027 template(java_lang_invoke_MemberName,MN_TRUSTED_MODE) \
1028 /*end*/
1029
1030 #define IGNORE_REQ(req_expr) /* req_expr */
1031 #define ONE_PLUS(scope,value) 1+
1032 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1033 #define VALUE_COMMA(scope,value) scope::value,
1034 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1035 #define STRING_NULL(scope,value) #value "\0"
1036 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1037
1038 static bool advertise_con_value(int which) {
1039 if (which < 0) return false;
1040 bool ok = true;
1041 int count = 0;
1042 #define INC_COUNT(scope,value) \
1043 ++count;
1044 #define CHECK_REQ(req_expr) \
1045 if (which < count) return ok; \
1046 ok = (req_expr);
1047 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1048 #undef INC_COUNT
1049 #undef CHECK_REQ
1050 assert(count == con_value_count, "");
1051 if (which < count) return ok;
1052 return false;
1053 }
1054
1055 #undef ONE_PLUS
1056 #undef VALUE_COMMA
1057 #undef STRING_NULL
1058 #undef EACH_NAMED_CON
1059 #endif // PRODUCT
1060
1061 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1062 #ifndef PRODUCT
1063 if (advertise_con_value(which)) {
1064 assert(which >= 0 && which < con_value_count, "");
1065 int con = con_values[which];
1066 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1067 if (box.not_null() && box->klass() == Universe::objectArrayKlass() && box->length() > 0) {
1068 const char* str = &con_names[0];
1069 for (int i = 0; i < which; i++)
1070 str += strlen(str) + 1; // skip name and null
1071 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1072 box->obj_at_put(0, name);
1073 }
1074 return con;
1075 }
1076 #endif
1077 return 0;
1078 }
1079 JVM_END
1080
1081 // void init(MemberName self, AccessibleObject ref)
1082 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1083 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1084 if (target_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1085 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1086 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1087 MethodHandles::init_MemberName(mname, target, CHECK);
1088 }
1089 JVM_END
1090
1091 // void expand(MemberName self)
1092 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1093 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1094 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1095 MethodHandles::expand_MemberName(mname, 0, CHECK);
1096 }
1097 JVM_END
1098
1099 // void resolve(MemberName self, Class<?> caller)
1100 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1101 jint lookup_mode, jboolean speculative_resolve)) {
1102 if (mname_jh == nullptr) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1103 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1104
1105 // The trusted Java code that calls this method should already have performed
1106 // access checks on behalf of the given caller. But, we can verify this.
1107 // This only verifies from the context of the lookup class. It does not
1108 // verify the lookup context for a Lookup object teleported from one module
1109 // to another. Such Lookup object can only access the intersection of the set
1110 // of accessible classes from both lookup class and previous lookup class.
1111 if (VerifyMethodHandles && (lookup_mode & LM_TRUSTED) == LM_TRUSTED && caller_jh != nullptr &&
1112 java_lang_invoke_MemberName::clazz(mname()) != nullptr) {
1113 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1114 if (reference_klass != nullptr && reference_klass->is_objArray_klass()) {
1115 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1116 }
1117
1118 // Reflection::verify_class_access can only handle instance classes.
1119 if (reference_klass != nullptr && reference_klass->is_instance_klass()) {
1120 // Emulate LinkResolver::check_klass_accessability.
1121 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1122 // access check on behalf of the caller if this is not a public lookup
1123 // i.e. lookup mode is not UNCONDITIONAL
1124 if ((lookup_mode & LM_UNCONDITIONAL) == 0
1125 && Reflection::verify_class_access(caller,
1126 InstanceKlass::cast(reference_klass),
1127 true) != Reflection::ACCESS_OK) {
1128 ResourceMark rm(THREAD);
1129 stringStream ss;
1130 ss.print("caller %s tried to access %s", caller->class_in_module_of_loader(),
1131 reference_klass->class_in_module_of_loader());
1132 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), ss.as_string());
1133 }
1134 }
1135 }
1136
1137 Klass* caller = caller_jh == nullptr ? nullptr :
1138 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1139 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, lookup_mode,
1140 speculative_resolve == JNI_TRUE,
1141 CHECK_NULL);
1142
1143 if (resolved.is_null()) {
1144 int flags = java_lang_invoke_MemberName::flags(mname());
1145 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1146 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1147 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1148 }
1149 if (speculative_resolve) {
1150 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1151 return nullptr;
1152 }
1153 if ((flags & ALL_KINDS) == IS_FIELD) {
1154 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1155 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1156 (flags & ALL_KINDS) == IS_OBJECT_CONSTRUCTOR) {
1157 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1158 } else {
1159 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1160 }
1161 }
1162
1163 return JNIHandles::make_local(THREAD, resolved());
1164 }
1165 JVM_END
1166
1167 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1168 if (mname == nullptr ||
1169 java_lang_invoke_MemberName::clazz(mname) == nullptr) {
1170 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1171 } else {
1172 int flags = java_lang_invoke_MemberName::flags(mname);
1173 if ((flags & IS_FIELD) != 0 &&
1174 (must_be_static
1175 ? (flags & JVM_ACC_STATIC) != 0
1176 : (flags & JVM_ACC_STATIC) == 0)) {
1177 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname);
1178 return (jlong) vmindex;
1179 }
1180 }
1181 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1182 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1183 return 0;
1184 }
1185
1186 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1187 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1188 }
1189 JVM_END
1190
1191 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1192 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1193 }
1194 JVM_END
1195
1196 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1197 // use the other function to perform sanity checks:
1198 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1199 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1200 return JNIHandles::make_local(THREAD, clazz);
1201 }
1202 JVM_END
1203
1204 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1205 if (mname_jh == nullptr) return nullptr;
1206 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1207 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1208 refArrayHandle result = oopFactory::new_refArray_handle(vmClasses::Object_klass(), 2, CHECK_NULL);
1209 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1210 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1211 result->obj_at_put(0, x);
1212
1213 int flags = java_lang_invoke_MemberName::flags(mname());
1214 if ((flags & IS_FIELD) != 0) {
1215 x = java_lang_invoke_MemberName::clazz(mname());
1216 } else {
1217 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1218 assert(vmtarget != nullptr && vmtarget->is_method(), "vmtarget is only method");
1219 x = mname();
1220 }
1221 result->obj_at_put(1, x);
1222 return JNIHandles::make_local(THREAD, result());
1223 }
1224 JVM_END
1225
1226 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1227 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1228 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1229 DeoptimizationScope deopt_scope;
1230 {
1231 // Walk all nmethods depending on this call site.
1232 MutexLocker mu(thread, Compile_lock);
1233 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1234 java_lang_invoke_CallSite::set_target(call_site(), target());
1235 // This is assumed to be an 'atomic' operation by verification.
1236 // So keep it under lock for now.
1237 deopt_scope.deoptimize_marked();
1238 }
1239 }
1240 JVM_END
1241
1242 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1243 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1244 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1245 DeoptimizationScope deopt_scope;
1246 {
1247 // Walk all nmethods depending on this call site.
1248 MutexLocker mu(thread, Compile_lock);
1249 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1250 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1251 // This is assumed to be an 'atomic' operation by verification.
1252 // So keep it under lock for now.
1253 deopt_scope.deoptimize_marked();
1254 }
1255 }
1256 JVM_END
1257
1258 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1259 jobject caller_jh, jintArray index_info_jh,
1260 jint start, jint end,
1261 jobjectArray buf_jh, jint pos,
1262 jboolean resolve, jobject ifna_jh)) {
1263 // caller->constants->copy_bootstrap_arguments_at performs a runtime
1264 // range check, but let's assert earlier as well.
1265 assert(start < end && start >= 0, "invariant");
1266 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1267 if (caller_k == nullptr || !caller_k->is_instance_klass()) {
1268 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1269 }
1270 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1271 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1272 if (index_info_oop == nullptr ||
1273 index_info_oop->klass() != Universe::intArrayKlass() ||
1274 typeArrayOop(index_info_oop)->length() < 2) {
1275 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1276 }
1277 typeArrayHandle index_info(THREAD, index_info_oop);
1278 int bss_index_in_pool = index_info->int_at(1);
1279 // While we are here, take a quick look at the index info:
1280 if (bss_index_in_pool <= 0 ||
1281 bss_index_in_pool >= caller->constants()->length() ||
1282 index_info->int_at(0)
1283 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1284 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1285 }
1286
1287 refArrayHandle buf(THREAD, (refArrayOop)JNIHandles::resolve(buf_jh));
1288
1289 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1290 caller->constants()->
1291 copy_bootstrap_arguments_at(bss_index_in_pool,
1292 start, end, buf, pos,
1293 (resolve == JNI_TRUE), ifna, CHECK);
1294 }
1295 JVM_END
1296
1297 /**
1298 * Throws a java/lang/UnsupportedOperationException unconditionally.
1299 * This is required by the specification of MethodHandle.invoke if
1300 * invoked directly.
1301 */
1302 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1303 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1304 return nullptr;
1305 }
1306 JVM_END
1307
1308 /**
1309 * Throws a java/lang/UnsupportedOperationException unconditionally.
1310 * This is required by the specification of MethodHandle.invokeExact if
1311 * invoked directly.
1312 */
1313 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1314 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1315 return nullptr;
1316 }
1317 JVM_END
1318
1319 /**
1320 * Throws a java/lang/UnsupportedOperationException unconditionally.
1321 * This is required by the specification of VarHandle.{access-mode} if
1322 * invoked directly.
1323 */
1324 JVM_ENTRY(jobject, VH_UOE(JNIEnv* env, jobject vh, jobjectArray args)) {
1325 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "VarHandle access mode methods cannot be invoked reflectively");
1326 return nullptr;
1327 }
1328 JVM_END
1329
1330
1331 /// JVM_RegisterMethodHandleMethods
1332
1333 #define LANG "Ljava/lang/"
1334 #define JLINV "Ljava/lang/invoke/"
1335
1336 #define OBJ LANG "Object;"
1337 #define CLS LANG "Class;"
1338 #define STRG LANG "String;"
1339 #define CS JLINV "CallSite;"
1340 #define MT JLINV "MethodType;"
1341 #define MH JLINV "MethodHandle;"
1342 #define MEM JLINV "MemberName;"
1343
1344 #define CC (char*) /*cast a literal from (const char*)*/
1345 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1346
1347 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1348 static JNINativeMethod MHN_methods[] = {
1349 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1350 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1351 {CC "resolve", CC "(" MEM "" CLS "IZ)" MEM, FN_PTR(MHN_resolve_Mem)},
1352 // static native int getNamedCon(int which, Object[] name)
1353 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1354 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1355 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1356 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1357 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1358 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1359 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1360 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1361 };
1362
1363 static JNINativeMethod MH_methods[] = {
1364 // UnsupportedOperationException throwers
1365 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1366 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1367 };
1368 static JNINativeMethod VH_methods[] = {
1369 // UnsupportedOperationException throwers
1370 {CC "get", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1371 {CC "set", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1372 {CC "getVolatile", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1373 {CC "setVolatile", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1374 {CC "getAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1375 {CC "setRelease", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1376 {CC "getOpaque", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1377 {CC "setOpaque", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1378 {CC "compareAndSet", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1379 {CC "compareAndExchange", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1380 {CC "compareAndExchangeAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1381 {CC "compareAndExchangeRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1382 {CC "weakCompareAndSetPlain", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1383 {CC "weakCompareAndSet", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1384 {CC "weakCompareAndSetAcquire", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1385 {CC "weakCompareAndSetRelease", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1386 {CC "getAndSet", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1387 {CC "getAndSetAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1388 {CC "getAndSetRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1389 {CC "getAndAdd", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1390 {CC "getAndAddAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1391 {CC "getAndAddRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1392 {CC "getAndBitwiseOr", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1393 {CC "getAndBitwiseOrAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1394 {CC "getAndBitwiseOrRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1395 {CC "getAndBitwiseAnd", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1396 {CC "getAndBitwiseAndAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1397 {CC "getAndBitwiseAndRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1398 {CC "getAndBitwiseXor", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1399 {CC "getAndBitwiseXorAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1400 {CC "getAndBitwiseXorRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)}
1401 };
1402
1403 /**
1404 * This one function is exported, used by NativeLookup.
1405 */
1406 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1407 assert(!MethodHandles::enabled(), "must not be enabled");
1408 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
1409 assert(vmClasses::VarHandle_klass() != nullptr, "should be present");
1410
1411 oop mh_mirror = vmClasses::MethodHandle_klass()->java_mirror();
1412 oop vh_mirror = vmClasses::VarHandle_klass()->java_mirror();
1413 jclass MH_class = (jclass) JNIHandles::make_local(THREAD, mh_mirror);
1414 jclass VH_class = (jclass) JNIHandles::make_local(THREAD, vh_mirror);
1415
1416 {
1417 ThreadToNativeFromVM ttnfv(thread);
1418
1419 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1420 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1421 "register java.lang.invoke.MethodHandleNative natives");
1422
1423 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1424 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1425 "register java.lang.invoke.MethodHandle natives");
1426
1427 status = env->RegisterNatives(VH_class, VH_methods, sizeof(VH_methods)/sizeof(JNINativeMethod));
1428 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1429 "register java.lang.invoke.VarHandle natives");
1430 }
1431
1432 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1433
1434 MethodHandles::set_enabled(true);
1435 }
1436 JVM_END