1 /*
2 * Copyright (c) 2008, 2025, 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/oopMapCache.hpp"
35 #include "interpreter/linkResolver.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/timerTrace.hpp"
56 #include "runtime/reflection.hpp"
57 #include "runtime/safepointVerifiers.hpp"
58 #include "runtime/signature.hpp"
59 #include "runtime/stubRoutines.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 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
164 Handle empty;
165 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
166 if (!java_lang_String::is_instance(type())) {
167 return type; // already resolved
168 }
169 Symbol* signature = java_lang_String::as_symbol_or_null(type());
170 if (signature == nullptr) {
171 return empty; // no such signature exists in the VM
172 }
173 Handle resolved;
174 int flags = java_lang_invoke_MemberName::flags(mname());
175 switch (flags & ALL_KINDS) {
176 case IS_METHOD:
177 case IS_OBJECT_CONSTRUCTOR:
178 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
179 break;
180 case IS_FIELD:
181 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
182 break;
183 default:
184 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
185 }
186 if (resolved.is_null()) {
187 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
188 }
189 return resolved;
190 }
191
192 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
193 // This method is used from java.lang.invoke.MemberName constructors.
194 // It fills in the new MemberName from a java.lang.reflect.Member.
195 oop target_oop = target();
196 Klass* target_klass = target_oop->klass();
197 if (target_klass == vmClasses::reflect_Field_klass()) {
198 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
199 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
200 Klass* k = java_lang_Class::as_Klass(clazz);
201 if (k != nullptr && k->is_instance_klass()) {
202 fieldDescriptor fd(InstanceKlass::cast(k), slot);
203 oop mname2 = init_field_MemberName(mname, fd);
204 if (mname2 != nullptr) {
205 // Since we have the reified name and type handy, add them to the result.
206 if (java_lang_invoke_MemberName::name(mname2) == nullptr)
207 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
208 if (java_lang_invoke_MemberName::type(mname2) == nullptr)
209 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
210 }
211 return mname2;
212 }
213 } else if (target_klass == vmClasses::reflect_Method_klass()) {
214 oop clazz = java_lang_reflect_Method::clazz(target_oop);
215 int slot = java_lang_reflect_Method::slot(target_oop);
216 Klass* k = java_lang_Class::as_Klass(clazz);
217 if (k != nullptr && k->is_instance_klass()) {
218 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
219 if (m == nullptr || is_signature_polymorphic(m->intrinsic_id()))
220 return nullptr; // do not resolve unless there is a concrete signature
221 CallInfo info(m, k, CHECK_NULL);
222 return init_method_MemberName(mname, info);
223 }
224 } else if (target_klass == vmClasses::reflect_Constructor_klass()) {
225 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
226 int slot = java_lang_reflect_Constructor::slot(target_oop);
227 Klass* k = java_lang_Class::as_Klass(clazz);
228 if (k != nullptr && k->is_instance_klass()) {
229 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
230 if (m == nullptr) return nullptr;
231 CallInfo info(m, k, CHECK_NULL);
232 return init_method_MemberName(mname, info);
233 }
234 }
235 return nullptr;
236 }
237
238 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
239 assert(info.resolved_appendix().is_null(), "only normal methods here");
240 methodHandle m(Thread::current(), info.resolved_method());
241 assert(m.not_null(), "null method handle");
242 InstanceKlass* m_klass = m->method_holder();
243 assert(m_klass != nullptr, "null holder for method handle");
244 int flags = (m->access_flags().as_method_flags());
245 int vmindex = Method::invalid_vtable_index;
246 LogTarget(Debug, methodhandles, indy) lt_indy;
247
248 switch (info.call_kind()) {
249 case CallInfo::itable_call:
250 vmindex = info.itable_index();
251 // More importantly, the itable index only works with the method holder.
252 assert(m_klass->verify_itable_index(vmindex), "");
253 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
254 if (lt_indy.is_enabled()) {
255 ResourceMark rm;
256 LogStream ls(lt_indy);
257 ls.print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
258 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
259 vmindex);
260 m->access_flags().print_on(&ls);
261 if (!m->is_abstract()) {
262 if (!m->is_private()) {
263 ls.print("default");
264 }
265 else {
266 ls.print("private-intf");
267 }
268 }
269 ls.cr();
270 }
271 break;
272
273 case CallInfo::vtable_call:
274 vmindex = info.vtable_index();
275 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
276 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
277 if (m_klass->is_interface()) {
278 // This is a vtable call to an interface method (abstract "miranda method" or default method).
279 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
280 // (LinkResolver should help us figure this out.)
281 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass");
282 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass());
283 if (m_klass_non_interface->is_interface()) {
284 m_klass_non_interface = vmClasses::Object_klass();
285 #ifdef ASSERT
286 { ResourceMark rm;
287 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
288 assert(m->name() == m2->name() && m->signature() == m2->signature(),
289 "at %d, %s != %s", vmindex,
290 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
291 }
292 #endif //ASSERT
293 }
294 if (!m->is_public()) {
295 assert(m->is_public(), "virtual call must be to public interface method");
296 return nullptr; // elicit an error later in product build
297 }
298 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
299 m_klass = m_klass_non_interface;
300 }
301 if (lt_indy.is_enabled()) {
302 ResourceMark rm;
303 LogStream ls(lt_indy);
304 ls.print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
305 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
306 m_klass->internal_name(), vmindex);
307 m->access_flags().print_on(&ls);
308 if (m->is_default_method()) {
309 ls.print("default");
310 }
311 ls.cr();
312 }
313 break;
314
315 case CallInfo::direct_call:
316 vmindex = Method::nonvirtual_vtable_index;
317 if (m->is_static()) {
318 assert(!m->is_class_initializer(), "Cannot be static initializer");
319 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
320 } else if (m->is_object_constructor()) {
321 flags |= IS_OBJECT_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
322 } else {
323 // "special" reflects that this is a direct call, not that it
324 // necessarily originates from an invokespecial. We can also do
325 // direct calls for private and/or final non-static methods.
326 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
327 }
328 break;
329
330 default: assert(false, "bad CallInfo"); return nullptr;
331 }
332
333 // @CallerSensitive annotation detected
334 if (m->caller_sensitive()) {
335 flags |= CALLER_SENSITIVE;
336 }
337
338 Handle resolved_method = info.resolved_method_name();
339 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(),
340 "Should not change after link resolution");
341
342 oop mname_oop = mname();
343 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
344 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
345 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
346 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
347 // Note: name and type can be lazily computed by resolve_MemberName,
348 // if Java code needs them as resolved String and MethodType objects.
349 // If relevant, the vtable or itable value is stored as vmindex.
350 // This is done eagerly, since it is readily available without
351 // constructing any new objects.
352 return mname();
353 }
354
355 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
356 InstanceKlass* ik = fd.field_holder();
357 int flags = fd.access_flags().as_field_flags();
358 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
359 if (fd.is_trusted_final()) flags |= TRUSTED_FINAL;
360 if (fd.is_flat()) {
361 int layout_kind = (int)fd.layout_kind();
362 assert((layout_kind & LAYOUT_MASK) == layout_kind, "Layout information loss");
363 flags |= layout_kind << LAYOUT_SHIFT;
364 }
365 if (fd.is_null_free_inline_type()) flags |= NULL_RESTRICTED;
366 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
367 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
368
369 oop mname_oop = mname();
370 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
371 java_lang_invoke_MemberName::set_method (mname_oop, nullptr);
372 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
373 java_lang_invoke_MemberName::set_clazz (mname_oop, ik->java_mirror());
374
375 oop type = field_signature_type_or_null(fd.signature());
376 oop name = field_name_or_null(fd.name());
377 if (name != nullptr)
378 java_lang_invoke_MemberName::set_name(mname_oop, name);
379 if (type != nullptr)
380 java_lang_invoke_MemberName::set_type(mname_oop, type);
381 // Note: name and type can be lazily computed by resolve_MemberName,
382 // if Java code needs them as resolved String and Class objects.
383 // Note that the incoming type oop might be pre-resolved (non-null).
384 // The base clazz and field offset (vmindex) must be eagerly stored,
385 // because they unambiguously identify the field.
386 // Although the fieldDescriptor::_index would also identify the field,
387 // we do not use it, because it is harder to decode.
388 // TO DO: maybe intern mname_oop
389 return mname();
390 }
391
392 // JVM 2.9 Special Methods:
393 // A method is signature polymorphic if and only if all of the following conditions hold :
394 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
395 // * It has a single formal parameter of type Object[].
396 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
397 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
398 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
399 if (klass == nullptr)
400 return false;
401 // The following test will fail spuriously during bootstrap of MethodHandle itself:
402 // if (klass != vmClasses::MethodHandle_klass())
403 // Test the name instead:
404 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
405 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
406 return false;
407 }
408
409 // Look up signature polymorphic method with polymorphic return type
410 Symbol* poly_sig = vmSymbols::object_array_object_signature();
411 InstanceKlass* iklass = InstanceKlass::cast(klass);
412 Method* m = iklass->find_method(name, poly_sig);
413 if (m != nullptr) {
414 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
415 int flags = m->access_flags().as_method_flags();
416 if ((flags & required) == required) {
417 return true;
418 }
419 }
420
421 // Look up signature polymorphic method with non-polymorphic (non Object) return type
422 int me;
423 int ms = iklass->find_method_by_name(name, &me);
424 if (ms == -1) return false;
425 for (; ms < me; ms++) {
426 Method* m = iklass->methods()->at(ms);
427 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
428 int flags = m->access_flags().as_method_flags();
429 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
430 return true;
431 }
432 }
433 return false;
434 }
435
436
437 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
438 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
439 switch (iid) {
440 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
441 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
442 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
443 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
444 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
445 case vmIntrinsics::_linkToNative: return vmSymbols::linkToNative_name();
446 default:
447 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
448 }
449 }
450
451 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
452 switch(id) {
453 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
454 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
455 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
456 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
457 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
458 default:
459 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
460 }
461 }
462
463 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
464 switch (iid) {
465 case vmIntrinsics::_invokeBasic: return 0;
466 case vmIntrinsics::_linkToNative: return 0;
467 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
468 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
469 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
470 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
471 default:
472 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
473 }
474 }
475
476 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
477 vmSymbolID name_id = vmSymbols::find_sid(name);
478 switch (name_id) {
479 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
480 case VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
481 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
482 case VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
483
484 // There is one static signature-polymorphic method for each JVM invocation mode.
485 case VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
486 case VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
487 case VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
488 case VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
489 case VM_SYMBOL_ENUM_NAME(linkToNative_name): return vmIntrinsics::_linkToNative;
490 default: break;
491 }
492
493 // Cover the case of invokeExact and any future variants of invokeFoo.
494 Klass* mh_klass = vmClasses::klass_at(VM_CLASS_ID(MethodHandle_klass));
495 if (mh_klass != nullptr && is_method_handle_invoke_name(mh_klass, name)) {
496 return vmIntrinsics::_invokeGeneric;
497 }
498
499 // Cover the case of methods on VarHandle.
500 Klass* vh_klass = vmClasses::klass_at(VM_CLASS_ID(VarHandle_klass));
501 if (vh_klass != nullptr && is_method_handle_invoke_name(vh_klass, name)) {
502 return vmIntrinsics::_invokeGeneric;
503 }
504
505 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
506 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
507 return vmIntrinsics::_none;
508 }
509
510 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
511 if (klass != nullptr &&
512 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
513 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
514 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
515 if (iid != vmIntrinsics::_none)
516 return iid;
517 if (is_method_handle_invoke_name(klass, name))
518 return vmIntrinsics::_invokeGeneric;
519 }
520 return vmIntrinsics::_none;
521 }
522
523 // Returns true if method is signature polymorphic and public
524 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
525 if (is_signature_polymorphic_name(klass, name)) {
526 InstanceKlass* iklass = InstanceKlass::cast(klass);
527 int me;
528 int ms = iklass->find_method_by_name(name, &me);
529 assert(ms != -1, "");
530 for (; ms < me; ms++) {
531 Method* m = iklass->methods()->at(ms);
532 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
533 int flags = m->access_flags().as_method_flags();
534 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
535 return true;
536 }
537 }
538 }
539 return false;
540 }
541
542 // convert the external string or reflective type to an internal signature
543 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
544 if (java_lang_invoke_MethodType::is_instance(type_str)) {
545 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
546 } else if (java_lang_Class::is_instance(type_str)) {
547 return java_lang_Class::as_signature(type_str, false);
548 } else if (java_lang_String::is_instance(type_str)) {
549 if (intern_if_not_found) {
550 return java_lang_String::as_symbol(type_str);
551 } else {
552 return java_lang_String::as_symbol_or_null(type_str);
553 }
554 } else {
555 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", nullptr);
556 }
557 }
558
559 static const char OBJ_SIG[] = "Ljava/lang/Object;";
560 enum { OBJ_SIG_LEN = 18 };
561
562 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
563 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
564 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
565 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) {
566 switch (ss.type()) {
567 case T_OBJECT:
568 // only java/lang/Object is valid here
569 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, OBJ_SIG_LEN) != 0)
570 return false;
571 break;
572 case T_VOID:
573 case T_INT:
574 case T_LONG:
575 case T_FLOAT:
576 case T_DOUBLE:
577 break;
578 default:
579 // subword types (T_BYTE etc.), Q-descriptors, arrays
580 return false;
581 }
582 }
583 return true;
584 }
585
586 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg) {
587 Symbol* bsig = nullptr;
588 if (sig == nullptr) {
589 return sig;
590 } else if (is_basic_type_signature(sig)) {
591 sig->increment_refcount();
592 return sig; // that was easy
593 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) {
594 BasicType bt = Signature::basic_type(sig);
595 if (is_subword_type(bt)) {
596 bsig = vmSymbols::int_signature();
597 } else {
598 assert(is_reference_type(bt), "is_basic_type_signature was false");
599 bsig = vmSymbols::object_signature();
600 }
601 } else {
602 ResourceMark rm;
603 stringStream buffer(128);
604 buffer.put(JVM_SIGNATURE_FUNC);
605 int arg_pos = 0, keep_arg_pos = -1;
606 if (keep_last_arg)
607 keep_arg_pos = ArgumentCount(sig).size() - 1;
608 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
609 BasicType bt = ss.type();
610 size_t this_arg_pos = buffer.size();
611 if (ss.at_return_type()) {
612 buffer.put(JVM_SIGNATURE_ENDFUNC);
613 }
614 if (arg_pos == keep_arg_pos) {
615 buffer.write((char*) ss.raw_bytes(),
616 (int) ss.raw_length());
617 } else if (is_reference_type(bt)) {
618 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
619 } else {
620 if (is_subword_type(bt))
621 bt = T_INT;
622 buffer.put(type2char(bt));
623 }
624 arg_pos++;
625 }
626 const char* sigstr = buffer.base();
627 int siglen = (int) buffer.size();
628 bsig = SymbolTable::new_symbol(sigstr, siglen);
629 }
630 assert(is_basic_type_signature(bsig) ||
631 // detune assert in case the injected argument is not a basic type:
632 keep_last_arg, "");
633 return bsig;
634 }
635
636 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
637 Symbol* sig) {
638 st = st ? st : tty;
639 bool prev_type = false;
640 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC);
641 if (is_method) st->put(JVM_SIGNATURE_FUNC);
642 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
643 if (ss.at_return_type())
644 st->put(JVM_SIGNATURE_ENDFUNC);
645 else if (prev_type)
646 st->put(',');
647 const char* cp = (const char*) ss.raw_bytes();
648 if (ss.is_array()) {
649 st->put(JVM_SIGNATURE_ARRAY);
650 if (ss.array_prefix_length() == 1)
651 st->put(cp[1]);
652 else
653 st->put(JVM_SIGNATURE_CLASS);
654 } else {
655 st->put(cp[0]);
656 }
657 }
658 }
659
660
661
662 static oop object_java_mirror() {
663 return vmClasses::Object_klass()->java_mirror();
664 }
665
666 oop MethodHandles::field_name_or_null(Symbol* s) {
667 if (s == nullptr) return nullptr;
668 return StringTable::lookup(s);
669 }
670
671 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
672 if (s == nullptr) return nullptr;
673 BasicType bt = Signature::basic_type(s);
674 if (is_java_primitive(bt)) {
675 assert(s->utf8_length() == 1, "");
676 return java_lang_Class::primitive_mirror(bt);
677 }
678 // Here are some more short cuts for common types.
679 // They are optional, since reference types can be resolved lazily.
680 if (bt == T_OBJECT) {
681 if (s == vmSymbols::object_signature()) {
682 return object_java_mirror();
683 } else if (s == vmSymbols::class_signature()) {
684 return vmClasses::Class_klass()->java_mirror();
685 } else if (s == vmSymbols::string_signature()) {
686 return vmClasses::String_klass()->java_mirror();
687 }
688 }
689 return nullptr;
690 }
691
692 // An unresolved member name is a mere symbolic reference.
693 // Resolving it plants a vmtarget/vmindex in it,
694 // which refers directly to JVM internals.
695 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, int lookup_mode,
696 bool speculative_resolve, TRAPS) {
697 Handle empty;
698 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
699
700 if (java_lang_invoke_MemberName::vmtarget(mname()) != nullptr) {
701 // Already resolved.
702 DEBUG_ONLY(intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()));
703 assert(vmindex >= Method::nonvirtual_vtable_index, "");
704 return mname;
705 }
706
707 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
708 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
709 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
710 int flags = java_lang_invoke_MemberName::flags(mname());
711 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
712 if (!ref_kind_is_valid(ref_kind)) {
713 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
714 }
715
716 DEBUG_ONLY(intptr_t old_vmindex);
717 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
718
719 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
720 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
721 }
722
723 InstanceKlass* defc = nullptr;
724 {
725 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
726 if (defc_klass == nullptr) return empty; // a primitive; no resolution possible
727 if (!defc_klass->is_instance_klass()) {
728 if (!defc_klass->is_array_klass()) return empty;
729 defc_klass = vmClasses::Object_klass();
730 }
731 defc = InstanceKlass::cast(defc_klass);
732 }
733 if (defc == nullptr) {
734 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
735 }
736 defc->link_class(CHECK_(empty)); // possible safepoint
737
738 // convert the external string name to an internal symbol
739 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
740 if (name == nullptr) return empty; // no such name
741 if (name == vmSymbols::class_initializer_name())
742 return empty; // illegal name
743
744 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
745 if ((flags & ALL_KINDS) == IS_METHOD &&
746 (defc == vmClasses::MethodHandle_klass() || defc == vmClasses::VarHandle_klass()) &&
747 (ref_kind == JVM_REF_invokeVirtual ||
748 ref_kind == JVM_REF_invokeSpecial ||
749 // static invocation mode is required for _linkToVirtual, etc.:
750 ref_kind == JVM_REF_invokeStatic)) {
751 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
752 if (iid != vmIntrinsics::_none &&
753 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
754 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
755 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
756 mh_invoke_id = iid;
757 }
758 }
759
760 // convert the external string or reflective type to an internal signature
761 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
762 if (type == nullptr) return empty; // no such signature exists in the VM
763
764 // skip access check if it's trusted lookup
765 LinkInfo::AccessCheck access_check = caller != nullptr ?
766 LinkInfo::AccessCheck::required :
767 LinkInfo::AccessCheck::skip;
768 // skip loader constraints if it's trusted lookup or a public lookup
769 LinkInfo::LoaderConstraintCheck loader_constraint_check = (caller != nullptr && (lookup_mode & LM_UNCONDITIONAL) == 0) ?
770 LinkInfo::LoaderConstraintCheck::required :
771 LinkInfo::LoaderConstraintCheck::skip;
772
773 // Time to do the lookup.
774 switch (flags & ALL_KINDS) {
775 case IS_METHOD:
776 {
777 CallInfo result;
778 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
779 {
780 assert(!HAS_PENDING_EXCEPTION, "");
781 if (ref_kind == JVM_REF_invokeStatic) {
782 LinkResolver::resolve_static_call(result,
783 link_info, false, THREAD);
784 } else if (ref_kind == JVM_REF_invokeInterface) {
785 LinkResolver::resolve_interface_call(result, Handle(), defc,
786 link_info, false, THREAD);
787 } else if (mh_invoke_id != vmIntrinsics::_none) {
788 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
789 LinkResolver::resolve_handle_call(result, link_info, THREAD);
790 } else if (ref_kind == JVM_REF_invokeSpecial) {
791 LinkResolver::resolve_special_call(result, Handle(),
792 link_info, THREAD);
793 } else if (ref_kind == JVM_REF_invokeVirtual) {
794 LinkResolver::resolve_virtual_call(result, Handle(), defc,
795 link_info, false, THREAD);
796 } else {
797 assert(false, "ref_kind=%d", ref_kind);
798 }
799 if (HAS_PENDING_EXCEPTION) {
800 if (speculative_resolve) {
801 CLEAR_PENDING_EXCEPTION;
802 }
803 return empty;
804 }
805 }
806 if (result.resolved_appendix().not_null()) {
807 // The resolved MemberName must not be accompanied by an appendix argument,
808 // since there is no way to bind this value into the MemberName.
809 // Caller is responsible to prevent this from happening.
810 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
811 }
812 result.set_resolved_method_name(CHECK_(empty));
813 oop mname2 = init_method_MemberName(mname, result);
814 return Handle(THREAD, mname2);
815 }
816 case IS_OBJECT_CONSTRUCTOR:
817 {
818 CallInfo result;
819 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
820 {
821 assert(!HAS_PENDING_EXCEPTION, "");
822 if (name == vmSymbols::object_initializer_name() && type->is_void_method_signature()) {
823 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
824 } else {
825 break; // will throw after end of switch
826 }
827 if (HAS_PENDING_EXCEPTION) {
828 if (speculative_resolve) {
829 CLEAR_PENDING_EXCEPTION;
830 }
831 return empty;
832 }
833 }
834 assert(result.is_statically_bound(), "");
835 result.set_resolved_method_name(CHECK_(empty));
836 oop mname2 = init_method_MemberName(mname, result);
837 return Handle(THREAD, mname2);
838 }
839 case IS_FIELD:
840 {
841 fieldDescriptor result; // find_field initializes fd if found
842 {
843 assert(!HAS_PENDING_EXCEPTION, "");
844 LinkInfo link_info(defc, name, type, caller, LinkInfo::AccessCheck::skip, loader_constraint_check);
845 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
846 if (HAS_PENDING_EXCEPTION) {
847 if (speculative_resolve) {
848 CLEAR_PENDING_EXCEPTION;
849 }
850 return empty;
851 }
852 }
853 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
854 return Handle(THREAD, mname2);
855 }
856 default:
857 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
858 }
859
860 return empty;
861 }
862
863 // Conversely, a member name which is only initialized from JVM internals
864 // may have null defc, name, and type fields.
865 // Resolving it plants a vmtarget/vmindex in it,
866 // which refers directly to JVM internals.
867 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
868 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
869
870 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != nullptr);
871 bool have_name = (java_lang_invoke_MemberName::name(mname()) != nullptr);
872 bool have_type = (java_lang_invoke_MemberName::type(mname()) != nullptr);
873 int flags = java_lang_invoke_MemberName::flags(mname());
874
875 if (suppress != 0) {
876 if (suppress & _suppress_defc) have_defc = true;
877 if (suppress & _suppress_name) have_name = true;
878 if (suppress & _suppress_type) have_type = true;
879 }
880
881 if (have_defc && have_name && have_type) return; // nothing needed
882
883 switch (flags & ALL_KINDS) {
884 case IS_METHOD:
885 case IS_OBJECT_CONSTRUCTOR:
886 {
887 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
888 if (vmtarget == nullptr) {
889 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
890 }
891 methodHandle m(THREAD, vmtarget);
892 DEBUG_ONLY(vmtarget = nullptr); // safety
893 if (!have_defc) {
894 InstanceKlass* defc = m->method_holder();
895 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
896 }
897 if (!have_name) {
898 //not java_lang_String::create_from_symbol; let's intern member names
899 oop name = StringTable::intern(m->name(), CHECK);
900 java_lang_invoke_MemberName::set_name(mname(), name);
901 }
902 if (!have_type) {
903 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
904 java_lang_invoke_MemberName::set_type(mname(), type());
905 }
906 return;
907 }
908 case IS_FIELD:
909 {
910 oop clazz = java_lang_invoke_MemberName::clazz(mname());
911 if (clazz == nullptr) {
912 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
913 }
914 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
915 DEBUG_ONLY(clazz = nullptr); // safety
916 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
917 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
918 fieldDescriptor fd; // find_field initializes fd if found
919 if (!defc->find_field_from_offset(checked_cast<int>(vmindex), is_static, &fd))
920 break; // cannot expand
921 if (!have_name) {
922 //not java_lang_String::create_from_symbol; let's intern member names
923 oop name = StringTable::intern(fd.name(), CHECK);
924 java_lang_invoke_MemberName::set_name(mname(), name);
925 }
926 if (!have_type) {
927 // If it is a primitive field type, don't mess with short strings like "I".
928 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
929 if (type.is_null()) {
930 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
931 }
932 java_lang_invoke_MemberName::set_type(mname(), type());
933 }
934 return;
935 }
936 }
937 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
938 }
939
940 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
941 assert_locked_or_safepoint(CodeCache_lock);
942
943 DependencyContext deps = java_lang_invoke_CallSite::vmdependencies(call_site);
944 deps.add_dependent_nmethod(nm);
945 }
946
947 void MethodHandles::clean_dependency_context(oop call_site) {
948 DependencyContext deps = java_lang_invoke_CallSite::vmdependencies(call_site);
949 deps.clean_unloading_dependents();
950 }
951
952 void MethodHandles::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, Handle call_site, Handle target) {
953 assert_lock_strong(Compile_lock);
954
955 CallSiteDepChange changes(call_site, target);
956 {
957 NoSafepointVerifier nsv;
958 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
959
960 DependencyContext deps = java_lang_invoke_CallSite::vmdependencies(call_site());
961 deps.mark_dependent_nmethods(deopt_scope, changes);
962 }
963 }
964
965 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
966 if (log_is_enabled(Info, methodhandles)) {
967 const char* name = vmIntrinsics::name_at(iid);
968 if (*name == '_') name += 1;
969 const size_t len = strlen(name) + 50;
970 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
971 const char* suffix = "";
972 if (is_signature_polymorphic(iid)) {
973 if (is_signature_polymorphic_static(iid))
974 suffix = "/static";
975 else
976 suffix = "/private";
977 }
978 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
979 trace_method_handle(_masm, qname);
980 // LSan appears unable to keep track of qname, ignore it.
981 LSAN_IGNORE_OBJECT(qname);
982 // Note: Don't free the allocated char array because it's used
983 // during runtime.
984 }
985 }
986
987 //
988 // Here are the native methods in java.lang.invoke.MethodHandleNatives
989 // They are the private interface between this JVM and the HotSpot-specific
990 // Java code that implements JSR 292 method handles.
991 //
992 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
993 // that intrinsic (non-JNI) native methods are defined in HotSpot.
994 //
995
996 #ifndef PRODUCT
997 #define EACH_NAMED_CON(template, requirement) \
998 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
999 template(java_lang_invoke_MemberName,MN_IS_OBJECT_CONSTRUCTOR) \
1000 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1001 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1002 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1003 template(java_lang_invoke_MemberName,MN_TRUSTED_FINAL) \
1004 template(java_lang_invoke_MemberName,MN_HIDDEN_MEMBER) \
1005 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1006 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1007 template(java_lang_invoke_MemberName,MN_LAYOUT_SHIFT) \
1008 template(java_lang_invoke_MemberName,MN_LAYOUT_MASK) \
1009 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \
1010 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \
1011 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \
1012 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \
1013 template(java_lang_invoke_MemberName,MN_MODULE_MODE) \
1014 template(java_lang_invoke_MemberName,MN_UNCONDITIONAL_MODE) \
1015 template(java_lang_invoke_MemberName,MN_TRUSTED_MODE) \
1016 /*end*/
1017
1018 #define IGNORE_REQ(req_expr) /* req_expr */
1019 #define ONE_PLUS(scope,value) 1+
1020 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1021 #define VALUE_COMMA(scope,value) scope::value,
1022 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1023 #define STRING_NULL(scope,value) #value "\0"
1024 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1025
1026 static bool advertise_con_value(int which) {
1027 if (which < 0) return false;
1028 bool ok = true;
1029 int count = 0;
1030 #define INC_COUNT(scope,value) \
1031 ++count;
1032 #define CHECK_REQ(req_expr) \
1033 if (which < count) return ok; \
1034 ok = (req_expr);
1035 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1036 #undef INC_COUNT
1037 #undef CHECK_REQ
1038 assert(count == con_value_count, "");
1039 if (which < count) return ok;
1040 return false;
1041 }
1042
1043 #undef ONE_PLUS
1044 #undef VALUE_COMMA
1045 #undef STRING_NULL
1046 #undef EACH_NAMED_CON
1047 #endif // PRODUCT
1048
1049 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1050 #ifndef PRODUCT
1051 if (advertise_con_value(which)) {
1052 assert(which >= 0 && which < con_value_count, "");
1053 int con = con_values[which];
1054 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1055 if (box.not_null() && box->klass() == Universe::objectArrayKlass() && box->length() > 0) {
1056 const char* str = &con_names[0];
1057 for (int i = 0; i < which; i++)
1058 str += strlen(str) + 1; // skip name and null
1059 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1060 box->obj_at_put(0, name);
1061 }
1062 return con;
1063 }
1064 #endif
1065 return 0;
1066 }
1067 JVM_END
1068
1069 // void init(MemberName self, AccessibleObject ref)
1070 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1071 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1072 if (target_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1073 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1074 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1075 MethodHandles::init_MemberName(mname, target, CHECK);
1076 }
1077 JVM_END
1078
1079 // void expand(MemberName self)
1080 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1081 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1082 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1083 MethodHandles::expand_MemberName(mname, 0, CHECK);
1084 }
1085 JVM_END
1086
1087 // void resolve(MemberName self, Class<?> caller)
1088 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1089 jint lookup_mode, jboolean speculative_resolve)) {
1090 if (mname_jh == nullptr) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1091 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1092
1093 // The trusted Java code that calls this method should already have performed
1094 // access checks on behalf of the given caller. But, we can verify this.
1095 // This only verifies from the context of the lookup class. It does not
1096 // verify the lookup context for a Lookup object teleported from one module
1097 // to another. Such Lookup object can only access the intersection of the set
1098 // of accessible classes from both lookup class and previous lookup class.
1099 if (VerifyMethodHandles && (lookup_mode & LM_TRUSTED) == LM_TRUSTED && caller_jh != nullptr &&
1100 java_lang_invoke_MemberName::clazz(mname()) != nullptr) {
1101 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1102 if (reference_klass != nullptr && reference_klass->is_objArray_klass()) {
1103 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1104 }
1105
1106 // Reflection::verify_class_access can only handle instance classes.
1107 if (reference_klass != nullptr && reference_klass->is_instance_klass()) {
1108 // Emulate LinkResolver::check_klass_accessability.
1109 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1110 // access check on behalf of the caller if this is not a public lookup
1111 // i.e. lookup mode is not UNCONDITIONAL
1112 if ((lookup_mode & LM_UNCONDITIONAL) == 0
1113 && Reflection::verify_class_access(caller,
1114 InstanceKlass::cast(reference_klass),
1115 true) != Reflection::ACCESS_OK) {
1116 ResourceMark rm(THREAD);
1117 stringStream ss;
1118 ss.print("caller %s tried to access %s", caller->class_in_module_of_loader(),
1119 reference_klass->class_in_module_of_loader());
1120 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), ss.as_string());
1121 }
1122 }
1123 }
1124
1125 Klass* caller = caller_jh == nullptr ? nullptr :
1126 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1127 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, lookup_mode,
1128 speculative_resolve == JNI_TRUE,
1129 CHECK_NULL);
1130
1131 if (resolved.is_null()) {
1132 int flags = java_lang_invoke_MemberName::flags(mname());
1133 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1134 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1135 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1136 }
1137 if (speculative_resolve) {
1138 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1139 return nullptr;
1140 }
1141 if ((flags & ALL_KINDS) == IS_FIELD) {
1142 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1143 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1144 (flags & ALL_KINDS) == IS_OBJECT_CONSTRUCTOR) {
1145 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1146 } else {
1147 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1148 }
1149 }
1150
1151 return JNIHandles::make_local(THREAD, resolved());
1152 }
1153 JVM_END
1154
1155 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1156 if (mname == nullptr ||
1157 java_lang_invoke_MemberName::clazz(mname) == nullptr) {
1158 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1159 } else {
1160 int flags = java_lang_invoke_MemberName::flags(mname);
1161 if ((flags & IS_FIELD) != 0 &&
1162 (must_be_static
1163 ? (flags & JVM_ACC_STATIC) != 0
1164 : (flags & JVM_ACC_STATIC) == 0)) {
1165 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname);
1166 return (jlong) vmindex;
1167 }
1168 }
1169 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1170 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1171 return 0;
1172 }
1173
1174 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1175 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1176 }
1177 JVM_END
1178
1179 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1180 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1181 }
1182 JVM_END
1183
1184 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1185 // use the other function to perform sanity checks:
1186 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1187 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1188 return JNIHandles::make_local(THREAD, clazz);
1189 }
1190 JVM_END
1191
1192 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1193 if (mname_jh == nullptr) return nullptr;
1194 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1195 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1196 objArrayHandle result = oopFactory::new_objArray_handle(vmClasses::Object_klass(), 2, CHECK_NULL);
1197 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1198 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1199 result->obj_at_put(0, x);
1200
1201 int flags = java_lang_invoke_MemberName::flags(mname());
1202 if ((flags & IS_FIELD) != 0) {
1203 x = java_lang_invoke_MemberName::clazz(mname());
1204 } else {
1205 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1206 assert(vmtarget != nullptr && vmtarget->is_method(), "vmtarget is only method");
1207 x = mname();
1208 }
1209 result->obj_at_put(1, x);
1210 return JNIHandles::make_local(THREAD, result());
1211 }
1212 JVM_END
1213
1214 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1215 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1216 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1217 DeoptimizationScope deopt_scope;
1218 {
1219 // Walk all nmethods depending on this call site.
1220 MutexLocker mu(thread, Compile_lock);
1221 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1222 java_lang_invoke_CallSite::set_target(call_site(), target());
1223 // This is assumed to be an 'atomic' operation by verification.
1224 // So keep it under lock for now.
1225 deopt_scope.deoptimize_marked();
1226 }
1227 }
1228 JVM_END
1229
1230 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1231 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1232 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1233 DeoptimizationScope deopt_scope;
1234 {
1235 // Walk all nmethods depending on this call site.
1236 MutexLocker mu(thread, Compile_lock);
1237 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1238 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1239 // This is assumed to be an 'atomic' operation by verification.
1240 // So keep it under lock for now.
1241 deopt_scope.deoptimize_marked();
1242 }
1243 }
1244 JVM_END
1245
1246 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1247 jobject caller_jh, jintArray index_info_jh,
1248 jint start, jint end,
1249 jobjectArray buf_jh, jint pos,
1250 jboolean resolve, jobject ifna_jh)) {
1251 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1252 if (caller_k == nullptr || !caller_k->is_instance_klass()) {
1253 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1254 }
1255 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1256 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1257 if (index_info_oop == nullptr ||
1258 index_info_oop->klass() != Universe::intArrayKlass() ||
1259 typeArrayOop(index_info_oop)->length() < 2) {
1260 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1261 }
1262 typeArrayHandle index_info(THREAD, index_info_oop);
1263 int bss_index_in_pool = index_info->int_at(1);
1264 // While we are here, take a quick look at the index info:
1265 if (bss_index_in_pool <= 0 ||
1266 bss_index_in_pool >= caller->constants()->length() ||
1267 index_info->int_at(0)
1268 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1269 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1270 }
1271 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1272 if (start < 0) {
1273 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1274 if (start == pseudo_index) {
1275 if (start >= end || 0 > pos || pos >= buf->length()) break;
1276 oop pseudo_arg = nullptr;
1277 switch (pseudo_index) {
1278 case -4: // bootstrap method
1279 {
1280 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool);
1281 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1282 break;
1283 }
1284 case -3: // name
1285 {
1286 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic);
1287 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1288 pseudo_arg = str();
1289 break;
1290 }
1291 case -2: // type
1292 {
1293 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic);
1294 Handle th;
1295 if (type->char_at(0) == JVM_SIGNATURE_FUNC) {
1296 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1297 } else {
1298 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1299 }
1300 pseudo_arg = th();
1301 break;
1302 }
1303 case -1: // argument count
1304 {
1305 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool);
1306 jvalue argc_value; argc_value.i = (jint)argc;
1307 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1308 break;
1309 }
1310 }
1311
1312 // Store the pseudo-argument, and advance the pointers.
1313 buf->obj_at_put(pos++, pseudo_arg);
1314 ++start;
1315 }
1316 }
1317 // When we are done with this there may be regular arguments to process too.
1318 }
1319 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1320 caller->constants()->
1321 copy_bootstrap_arguments_at(bss_index_in_pool,
1322 start, end, buf, pos,
1323 (resolve == JNI_TRUE), ifna, CHECK);
1324 }
1325 JVM_END
1326
1327 /**
1328 * Throws a java/lang/UnsupportedOperationException unconditionally.
1329 * This is required by the specification of MethodHandle.invoke if
1330 * invoked directly.
1331 */
1332 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1333 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1334 return nullptr;
1335 }
1336 JVM_END
1337
1338 /**
1339 * Throws a java/lang/UnsupportedOperationException unconditionally.
1340 * This is required by the specification of MethodHandle.invokeExact if
1341 * invoked directly.
1342 */
1343 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1344 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1345 return nullptr;
1346 }
1347 JVM_END
1348
1349 /**
1350 * Throws a java/lang/UnsupportedOperationException unconditionally.
1351 * This is required by the specification of VarHandle.{access-mode} if
1352 * invoked directly.
1353 */
1354 JVM_ENTRY(jobject, VH_UOE(JNIEnv* env, jobject vh, jobjectArray args)) {
1355 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "VarHandle access mode methods cannot be invoked reflectively");
1356 return nullptr;
1357 }
1358 JVM_END
1359
1360
1361 /// JVM_RegisterMethodHandleMethods
1362
1363 #define LANG "Ljava/lang/"
1364 #define JLINV "Ljava/lang/invoke/"
1365
1366 #define OBJ LANG "Object;"
1367 #define CLS LANG "Class;"
1368 #define STRG LANG "String;"
1369 #define CS JLINV "CallSite;"
1370 #define MT JLINV "MethodType;"
1371 #define MH JLINV "MethodHandle;"
1372 #define MEM JLINV "MemberName;"
1373
1374 #define CC (char*) /*cast a literal from (const char*)*/
1375 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1376
1377 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1378 static JNINativeMethod MHN_methods[] = {
1379 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1380 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1381 {CC "resolve", CC "(" MEM "" CLS "IZ)" MEM, FN_PTR(MHN_resolve_Mem)},
1382 // static native int getNamedCon(int which, Object[] name)
1383 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1384 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1385 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1386 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1387 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1388 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1389 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1390 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1391 };
1392
1393 static JNINativeMethod MH_methods[] = {
1394 // UnsupportedOperationException throwers
1395 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1396 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1397 };
1398 static JNINativeMethod VH_methods[] = {
1399 // UnsupportedOperationException throwers
1400 {CC "get", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1401 {CC "set", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1402 {CC "getVolatile", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1403 {CC "setVolatile", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1404 {CC "getAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1405 {CC "setRelease", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1406 {CC "getOpaque", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1407 {CC "setOpaque", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1408 {CC "compareAndSet", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1409 {CC "compareAndExchange", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1410 {CC "compareAndExchangeAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1411 {CC "compareAndExchangeRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1412 {CC "weakCompareAndSetPlain", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1413 {CC "weakCompareAndSet", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1414 {CC "weakCompareAndSetAcquire", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1415 {CC "weakCompareAndSetRelease", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1416 {CC "getAndSet", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1417 {CC "getAndSetAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1418 {CC "getAndSetRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1419 {CC "getAndAdd", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1420 {CC "getAndAddAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1421 {CC "getAndAddRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1422 {CC "getAndBitwiseOr", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1423 {CC "getAndBitwiseOrAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1424 {CC "getAndBitwiseOrRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1425 {CC "getAndBitwiseAnd", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1426 {CC "getAndBitwiseAndAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1427 {CC "getAndBitwiseAndRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1428 {CC "getAndBitwiseXor", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1429 {CC "getAndBitwiseXorAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1430 {CC "getAndBitwiseXorRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)}
1431 };
1432
1433 /**
1434 * This one function is exported, used by NativeLookup.
1435 */
1436 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1437 assert(!MethodHandles::enabled(), "must not be enabled");
1438 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
1439 assert(vmClasses::VarHandle_klass() != nullptr, "should be present");
1440
1441 oop mh_mirror = vmClasses::MethodHandle_klass()->java_mirror();
1442 oop vh_mirror = vmClasses::VarHandle_klass()->java_mirror();
1443 jclass MH_class = (jclass) JNIHandles::make_local(THREAD, mh_mirror);
1444 jclass VH_class = (jclass) JNIHandles::make_local(THREAD, vh_mirror);
1445
1446 {
1447 ThreadToNativeFromVM ttnfv(thread);
1448
1449 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1450 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1451 "register java.lang.invoke.MethodHandleNative natives");
1452
1453 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1454 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1455 "register java.lang.invoke.MethodHandle natives");
1456
1457 status = env->RegisterNatives(VH_class, VH_methods, sizeof(VH_methods)/sizeof(JNINativeMethod));
1458 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1459 "register java.lang.invoke.VarHandle natives");
1460 }
1461
1462 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1463
1464 MethodHandles::set_enabled(true);
1465 }
1466 JVM_END