1 /*
2 * Copyright (c) 2008, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmClasses.hpp"
31 #include "code/codeCache.hpp"
32 #include "code/dependencyContext.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "interpreter/oopMapCache.hpp"
36 #include "interpreter/linkResolver.hpp"
37 #include "jvm_io.h"
38 #include "logging/log.hpp"
39 #include "logging/logStream.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.hpp"
44 #include "oops/klass.inline.hpp"
45 #include "oops/objArrayKlass.hpp"
46 #include "oops/objArrayOop.inline.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "oops/typeArrayOop.inline.hpp"
49 #include "prims/methodHandles.hpp"
50 #include "runtime/deoptimization.hpp"
51 #include "runtime/fieldDescriptor.inline.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "runtime/interfaceSupport.inline.hpp"
54 #include "runtime/javaCalls.hpp"
55 #include "runtime/jniHandles.inline.hpp"
56 #include "runtime/timerTrace.hpp"
57 #include "runtime/reflection.hpp"
58 #include "runtime/safepointVerifiers.hpp"
59 #include "runtime/signature.hpp"
60 #include "runtime/stubRoutines.hpp"
61 #include "sanitizers/leak.hpp"
62 #include "utilities/exceptions.hpp"
63
64
65 /*
66 * JSR 292 reference implementation: method handles
67 * The JDK 7 reference implementation represented method handle
68 * combinations as chains. Each link in the chain had a "vmentry"
69 * field which pointed at a bit of assembly code which performed
70 * one transformation before dispatching to the next link in the chain.
71 *
72 * The current reference implementation pushes almost all code generation
73 * responsibility to (trusted) Java code. A method handle contains a
74 * pointer to its "LambdaForm", which embodies all details of the method
75 * handle's behavior. The LambdaForm is a normal Java object, managed
76 * by a runtime coded in Java.
77 */
78
79 bool MethodHandles::_enabled = false; // set true after successful native linkage
80 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = nullptr;
81
82 /**
83 * Generates method handle adapters. Returns 'false' if memory allocation
84 * failed and true otherwise.
85 */
86 void MethodHandles::generate_adapters() {
87 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
88 assert(_adapter_code == nullptr, "generate only once");
89
90 ResourceMark rm;
91 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
92 // The adapter entry is required to be aligned to CodeEntryAlignment.
93 // So we need additional bytes due to alignment.
94 int adapter_num = (int)Interpreter::method_handle_invoke_LAST - (int)Interpreter::method_handle_invoke_FIRST + 1;
95 int max_aligned_bytes = adapter_num * CodeEntryAlignment;
96 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size + max_aligned_bytes);
97 CodeBuffer code(_adapter_code);
98 MethodHandlesAdapterGenerator g(&code);
99 g.generate();
100 code.log_section_sizes("MethodHandlesAdapterBlob");
101 }
102
103 //------------------------------------------------------------------------------
104 // MethodHandlesAdapterGenerator::generate
105 //
106 void MethodHandlesAdapterGenerator::generate() {
107 // Generate generic method handle adapters.
108 // Generate interpreter entries
109 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
110 mk <= Interpreter::method_handle_invoke_LAST;
111 mk = Interpreter::MethodKind(1 + (int)mk)) {
112 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
113 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
114 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
115 if (entry != nullptr) {
116 Interpreter::set_entry_for_kind(mk, entry);
117 }
118 // If the entry is not set, it will throw AbstractMethodError.
119 }
120 }
121
122 void MethodHandles::set_enabled(bool z) {
123 if (_enabled != z) {
124 guarantee(z, "can only enable once");
125 _enabled = z;
126 }
127 }
128
129 // MemberName support
130
131 // import java_lang_invoke_MemberName.*
132 enum {
133 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
134 IS_OBJECT_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_OBJECT_CONSTRUCTOR,
135 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
136 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
137 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
138 TRUSTED_FINAL = java_lang_invoke_MemberName::MN_TRUSTED_FINAL,
139 HIDDEN_MEMBER = java_lang_invoke_MemberName::MN_HIDDEN_MEMBER,
140 FLAT_FIELD = java_lang_invoke_MemberName::MN_FLAT_FIELD,
141 NULL_RESTRICTED = java_lang_invoke_MemberName::MN_NULL_RESTRICTED_FIELD,
142 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
143 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_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 = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
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 = (jushort)( fd.access_flags().as_short());
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()) flags |= FLAT_FIELD;
361 if (fd.is_null_free_inline_type()) flags |= NULL_RESTRICTED;
362 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
363 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
364
365 oop mname_oop = mname();
366 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
367 java_lang_invoke_MemberName::set_method (mname_oop, nullptr);
368 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
369 java_lang_invoke_MemberName::set_clazz (mname_oop, ik->java_mirror());
370
371 oop type = field_signature_type_or_null(fd.signature());
372 oop name = field_name_or_null(fd.name());
373 if (name != nullptr)
374 java_lang_invoke_MemberName::set_name(mname_oop, name);
375 if (type != nullptr)
376 java_lang_invoke_MemberName::set_type(mname_oop, type);
377 // Note: name and type can be lazily computed by resolve_MemberName,
378 // if Java code needs them as resolved String and Class objects.
379 // Note that the incoming type oop might be pre-resolved (non-null).
380 // The base clazz and field offset (vmindex) must be eagerly stored,
381 // because they unambiguously identify the field.
382 // Although the fieldDescriptor::_index would also identify the field,
383 // we do not use it, because it is harder to decode.
384 // TO DO: maybe intern mname_oop
385 return mname();
386 }
387
388 // JVM 2.9 Special Methods:
389 // A method is signature polymorphic if and only if all of the following conditions hold :
390 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
391 // * It has a single formal parameter of type Object[].
392 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
393 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
394 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
395 if (klass == nullptr)
396 return false;
397 // The following test will fail spuriously during bootstrap of MethodHandle itself:
398 // if (klass != vmClasses::MethodHandle_klass())
399 // Test the name instead:
400 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
401 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
402 return false;
403 }
404
405 // Look up signature polymorphic method with polymorphic return type
406 Symbol* poly_sig = vmSymbols::object_array_object_signature();
407 InstanceKlass* iklass = InstanceKlass::cast(klass);
408 Method* m = iklass->find_method(name, poly_sig);
409 if (m != nullptr) {
410 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
411 int flags = m->access_flags().as_int();
412 if ((flags & required) == required) {
413 return true;
414 }
415 }
416
417 // Look up signature polymorphic method with non-polymorphic (non Object) return type
418 int me;
419 int ms = iklass->find_method_by_name(name, &me);
420 if (ms == -1) return false;
421 for (; ms < me; ms++) {
422 Method* m = iklass->methods()->at(ms);
423 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
424 int flags = m->access_flags().as_int();
425 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
426 return true;
427 }
428 }
429 return false;
430 }
431
432
433 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
434 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
435 switch (iid) {
436 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
437 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
438 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
439 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
440 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
441 case vmIntrinsics::_linkToNative: return vmSymbols::linkToNative_name();
442 default:
443 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
444 }
445 }
446
447 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
448 switch(id) {
449 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
450 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
451 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
452 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
453 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
454 default:
455 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
456 }
457 }
458
459 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
460 switch (iid) {
461 case vmIntrinsics::_invokeBasic: return 0;
462 case vmIntrinsics::_linkToNative: return 0;
463 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
464 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
465 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
466 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
467 default:
468 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
469 }
470 }
471
472 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
473 vmSymbolID name_id = vmSymbols::find_sid(name);
474 switch (name_id) {
475 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
476 case VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
477 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
478 case VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
479
480 // There is one static signature-polymorphic method for each JVM invocation mode.
481 case VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
482 case VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
483 case VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
484 case VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
485 case VM_SYMBOL_ENUM_NAME(linkToNative_name): return vmIntrinsics::_linkToNative;
486 default: break;
487 }
488
489 // Cover the case of invokeExact and any future variants of invokeFoo.
490 Klass* mh_klass = vmClasses::klass_at(VM_CLASS_ID(MethodHandle_klass));
491 if (mh_klass != nullptr && is_method_handle_invoke_name(mh_klass, name)) {
492 return vmIntrinsics::_invokeGeneric;
493 }
494
495 // Cover the case of methods on VarHandle.
496 Klass* vh_klass = vmClasses::klass_at(VM_CLASS_ID(VarHandle_klass));
497 if (vh_klass != nullptr && is_method_handle_invoke_name(vh_klass, name)) {
498 return vmIntrinsics::_invokeGeneric;
499 }
500
501 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
502 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
503 return vmIntrinsics::_none;
504 }
505
506 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
507 if (klass != nullptr &&
508 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
509 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
510 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
511 if (iid != vmIntrinsics::_none)
512 return iid;
513 if (is_method_handle_invoke_name(klass, name))
514 return vmIntrinsics::_invokeGeneric;
515 }
516 return vmIntrinsics::_none;
517 }
518
519 // Returns true if method is signature polymorphic and public
520 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
521 if (is_signature_polymorphic_name(klass, name)) {
522 InstanceKlass* iklass = InstanceKlass::cast(klass);
523 int me;
524 int ms = iklass->find_method_by_name(name, &me);
525 assert(ms != -1, "");
526 for (; ms < me; ms++) {
527 Method* m = iklass->methods()->at(ms);
528 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
529 int flags = m->access_flags().as_int();
530 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
531 return true;
532 }
533 }
534 }
535 return false;
536 }
537
538 // convert the external string or reflective type to an internal signature
539 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
540 if (java_lang_invoke_MethodType::is_instance(type_str)) {
541 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
542 } else if (java_lang_Class::is_instance(type_str)) {
543 return java_lang_Class::as_signature(type_str, false);
544 } else if (java_lang_String::is_instance(type_str)) {
545 if (intern_if_not_found) {
546 return java_lang_String::as_symbol(type_str);
547 } else {
548 return java_lang_String::as_symbol_or_null(type_str);
549 }
550 } else {
551 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", nullptr);
552 }
553 }
554
555 static const char OBJ_SIG[] = "Ljava/lang/Object;";
556 enum { OBJ_SIG_LEN = 18 };
557
558 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
559 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
560 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
561 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) {
562 switch (ss.type()) {
563 case T_OBJECT:
564 // only java/lang/Object is valid here
565 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, OBJ_SIG_LEN) != 0)
566 return false;
567 break;
568 case T_VOID:
569 case T_INT:
570 case T_LONG:
571 case T_FLOAT:
572 case T_DOUBLE:
573 break;
574 default:
575 // subword types (T_BYTE etc.), Q-descriptors, arrays
576 return false;
577 }
578 }
579 return true;
580 }
581
582 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg) {
583 Symbol* bsig = nullptr;
584 if (sig == nullptr) {
585 return sig;
586 } else if (is_basic_type_signature(sig)) {
587 sig->increment_refcount();
588 return sig; // that was easy
589 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) {
590 BasicType bt = Signature::basic_type(sig);
591 if (is_subword_type(bt)) {
592 bsig = vmSymbols::int_signature();
593 } else {
594 assert(is_reference_type(bt), "is_basic_type_signature was false");
595 bsig = vmSymbols::object_signature();
596 }
597 } else {
598 ResourceMark rm;
599 stringStream buffer(128);
600 buffer.put(JVM_SIGNATURE_FUNC);
601 int arg_pos = 0, keep_arg_pos = -1;
602 if (keep_last_arg)
603 keep_arg_pos = ArgumentCount(sig).size() - 1;
604 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
605 BasicType bt = ss.type();
606 size_t this_arg_pos = buffer.size();
607 if (ss.at_return_type()) {
608 buffer.put(JVM_SIGNATURE_ENDFUNC);
609 }
610 if (arg_pos == keep_arg_pos) {
611 buffer.write((char*) ss.raw_bytes(),
612 (int) ss.raw_length());
613 } else if (is_reference_type(bt)) {
614 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
615 } else {
616 if (is_subword_type(bt))
617 bt = T_INT;
618 buffer.put(type2char(bt));
619 }
620 arg_pos++;
621 }
622 const char* sigstr = buffer.base();
623 int siglen = (int) buffer.size();
624 bsig = SymbolTable::new_symbol(sigstr, siglen);
625 }
626 assert(is_basic_type_signature(bsig) ||
627 // detune assert in case the injected argument is not a basic type:
628 keep_last_arg, "");
629 return bsig;
630 }
631
632 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
633 Symbol* sig) {
634 st = st ? st : tty;
635 bool prev_type = false;
636 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC);
637 if (is_method) st->put(JVM_SIGNATURE_FUNC);
638 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
639 if (ss.at_return_type())
640 st->put(JVM_SIGNATURE_ENDFUNC);
641 else if (prev_type)
642 st->put(',');
643 const char* cp = (const char*) ss.raw_bytes();
644 if (ss.is_array()) {
645 st->put(JVM_SIGNATURE_ARRAY);
646 if (ss.array_prefix_length() == 1)
647 st->put(cp[1]);
648 else
649 st->put(JVM_SIGNATURE_CLASS);
650 } else {
651 st->put(cp[0]);
652 }
653 }
654 }
655
656
657
658 static oop object_java_mirror() {
659 return vmClasses::Object_klass()->java_mirror();
660 }
661
662 oop MethodHandles::field_name_or_null(Symbol* s) {
663 if (s == nullptr) return nullptr;
664 return StringTable::lookup(s);
665 }
666
667 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
668 if (s == nullptr) return nullptr;
669 BasicType bt = Signature::basic_type(s);
670 if (is_java_primitive(bt)) {
671 assert(s->utf8_length() == 1, "");
672 return java_lang_Class::primitive_mirror(bt);
673 }
674 // Here are some more short cuts for common types.
675 // They are optional, since reference types can be resolved lazily.
676 if (bt == T_OBJECT) {
677 if (s == vmSymbols::object_signature()) {
678 return object_java_mirror();
679 } else if (s == vmSymbols::class_signature()) {
680 return vmClasses::Class_klass()->java_mirror();
681 } else if (s == vmSymbols::string_signature()) {
682 return vmClasses::String_klass()->java_mirror();
683 }
684 }
685 return nullptr;
686 }
687
688 // An unresolved member name is a mere symbolic reference.
689 // Resolving it plants a vmtarget/vmindex in it,
690 // which refers directly to JVM internals.
691 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, int lookup_mode,
692 bool speculative_resolve, TRAPS) {
693 Handle empty;
694 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
695
696 if (java_lang_invoke_MemberName::vmtarget(mname()) != nullptr) {
697 // Already resolved.
698 DEBUG_ONLY(intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()));
699 assert(vmindex >= Method::nonvirtual_vtable_index, "");
700 return mname;
701 }
702
703 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
704 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
705 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
706 int flags = java_lang_invoke_MemberName::flags(mname());
707 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
708 if (!ref_kind_is_valid(ref_kind)) {
709 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
710 }
711
712 DEBUG_ONLY(intptr_t old_vmindex);
713 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
714
715 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
716 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
717 }
718
719 InstanceKlass* defc = nullptr;
720 {
721 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
722 if (defc_klass == nullptr) return empty; // a primitive; no resolution possible
723 if (!defc_klass->is_instance_klass()) {
724 if (!defc_klass->is_array_klass()) return empty;
725 defc_klass = vmClasses::Object_klass();
726 }
727 defc = InstanceKlass::cast(defc_klass);
728 }
729 if (defc == nullptr) {
730 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
731 }
732 defc->link_class(CHECK_(empty)); // possible safepoint
733
734 // convert the external string name to an internal symbol
735 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
736 if (name == nullptr) return empty; // no such name
737 if (name == vmSymbols::class_initializer_name())
738 return empty; // illegal name
739
740 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
741 if ((flags & ALL_KINDS) == IS_METHOD &&
742 (defc == vmClasses::MethodHandle_klass() || defc == vmClasses::VarHandle_klass()) &&
743 (ref_kind == JVM_REF_invokeVirtual ||
744 ref_kind == JVM_REF_invokeSpecial ||
745 // static invocation mode is required for _linkToVirtual, etc.:
746 ref_kind == JVM_REF_invokeStatic)) {
747 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
748 if (iid != vmIntrinsics::_none &&
749 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
750 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
751 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
752 mh_invoke_id = iid;
753 }
754 }
755
756 // convert the external string or reflective type to an internal signature
757 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
758 if (type == nullptr) return empty; // no such signature exists in the VM
759
760 // skip access check if it's trusted lookup
761 LinkInfo::AccessCheck access_check = caller != nullptr ?
762 LinkInfo::AccessCheck::required :
763 LinkInfo::AccessCheck::skip;
764 // skip loader constraints if it's trusted lookup or a public lookup
765 LinkInfo::LoaderConstraintCheck loader_constraint_check = (caller != nullptr && (lookup_mode & LM_UNCONDITIONAL) == 0) ?
766 LinkInfo::LoaderConstraintCheck::required :
767 LinkInfo::LoaderConstraintCheck::skip;
768
769 // Time to do the lookup.
770 switch (flags & ALL_KINDS) {
771 case IS_METHOD:
772 {
773 CallInfo result;
774 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
775 {
776 assert(!HAS_PENDING_EXCEPTION, "");
777 if (ref_kind == JVM_REF_invokeStatic) {
778 LinkResolver::resolve_static_call(result,
779 link_info, false, THREAD);
780 } else if (ref_kind == JVM_REF_invokeInterface) {
781 LinkResolver::resolve_interface_call(result, Handle(), defc,
782 link_info, false, THREAD);
783 } else if (mh_invoke_id != vmIntrinsics::_none) {
784 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
785 LinkResolver::resolve_handle_call(result, link_info, THREAD);
786 } else if (ref_kind == JVM_REF_invokeSpecial) {
787 LinkResolver::resolve_special_call(result, Handle(),
788 link_info, THREAD);
789 } else if (ref_kind == JVM_REF_invokeVirtual) {
790 LinkResolver::resolve_virtual_call(result, Handle(), defc,
791 link_info, false, THREAD);
792 } else {
793 assert(false, "ref_kind=%d", ref_kind);
794 }
795 if (HAS_PENDING_EXCEPTION) {
796 if (speculative_resolve) {
797 CLEAR_PENDING_EXCEPTION;
798 }
799 return empty;
800 }
801 }
802 if (result.resolved_appendix().not_null()) {
803 // The resolved MemberName must not be accompanied by an appendix argument,
804 // since there is no way to bind this value into the MemberName.
805 // Caller is responsible to prevent this from happening.
806 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
807 }
808 result.set_resolved_method_name(CHECK_(empty));
809 oop mname2 = init_method_MemberName(mname, result);
810 return Handle(THREAD, mname2);
811 }
812 case IS_OBJECT_CONSTRUCTOR:
813 {
814 CallInfo result;
815 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
816 {
817 assert(!HAS_PENDING_EXCEPTION, "");
818 if (name == vmSymbols::object_initializer_name() && type->is_void_method_signature()) {
819 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
820 } else {
821 break; // will throw after end of switch
822 }
823 if (HAS_PENDING_EXCEPTION) {
824 if (speculative_resolve) {
825 CLEAR_PENDING_EXCEPTION;
826 }
827 return empty;
828 }
829 }
830 assert(result.is_statically_bound(), "");
831 result.set_resolved_method_name(CHECK_(empty));
832 oop mname2 = init_method_MemberName(mname, result);
833 return Handle(THREAD, mname2);
834 }
835 case IS_FIELD:
836 {
837 fieldDescriptor result; // find_field initializes fd if found
838 {
839 assert(!HAS_PENDING_EXCEPTION, "");
840 LinkInfo link_info(defc, name, type, caller, LinkInfo::AccessCheck::skip, loader_constraint_check);
841 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
842 if (HAS_PENDING_EXCEPTION) {
843 if (speculative_resolve) {
844 CLEAR_PENDING_EXCEPTION;
845 }
846 return empty;
847 }
848 }
849 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
850 return Handle(THREAD, mname2);
851 }
852 default:
853 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
854 }
855
856 return empty;
857 }
858
859 // Conversely, a member name which is only initialized from JVM internals
860 // may have null defc, name, and type fields.
861 // Resolving it plants a vmtarget/vmindex in it,
862 // which refers directly to JVM internals.
863 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
864 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
865
866 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != nullptr);
867 bool have_name = (java_lang_invoke_MemberName::name(mname()) != nullptr);
868 bool have_type = (java_lang_invoke_MemberName::type(mname()) != nullptr);
869 int flags = java_lang_invoke_MemberName::flags(mname());
870
871 if (suppress != 0) {
872 if (suppress & _suppress_defc) have_defc = true;
873 if (suppress & _suppress_name) have_name = true;
874 if (suppress & _suppress_type) have_type = true;
875 }
876
877 if (have_defc && have_name && have_type) return; // nothing needed
878
879 switch (flags & ALL_KINDS) {
880 case IS_METHOD:
881 case IS_OBJECT_CONSTRUCTOR:
882 {
883 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
884 if (vmtarget == nullptr) {
885 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
886 }
887 methodHandle m(THREAD, vmtarget);
888 DEBUG_ONLY(vmtarget = nullptr); // safety
889 if (!have_defc) {
890 InstanceKlass* defc = m->method_holder();
891 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
892 }
893 if (!have_name) {
894 //not java_lang_String::create_from_symbol; let's intern member names
895 oop name = StringTable::intern(m->name(), CHECK);
896 java_lang_invoke_MemberName::set_name(mname(), name);
897 }
898 if (!have_type) {
899 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
900 java_lang_invoke_MemberName::set_type(mname(), type());
901 }
902 return;
903 }
904 case IS_FIELD:
905 {
906 oop clazz = java_lang_invoke_MemberName::clazz(mname());
907 if (clazz == nullptr) {
908 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
909 }
910 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
911 DEBUG_ONLY(clazz = nullptr); // safety
912 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
913 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
914 fieldDescriptor fd; // find_field initializes fd if found
915 if (!defc->find_field_from_offset(checked_cast<int>(vmindex), is_static, &fd))
916 break; // cannot expand
917 if (!have_name) {
918 //not java_lang_String::create_from_symbol; let's intern member names
919 oop name = StringTable::intern(fd.name(), CHECK);
920 java_lang_invoke_MemberName::set_name(mname(), name);
921 }
922 if (!have_type) {
923 // If it is a primitive field type, don't mess with short strings like "I".
924 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
925 if (type.is_null()) {
926 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
927 }
928 java_lang_invoke_MemberName::set_type(mname(), type());
929 }
930 return;
931 }
932 }
933 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
934 }
935
936 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
937 assert_locked_or_safepoint(CodeCache_lock);
938
939 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
940 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
941 // Try to purge stale entries on updates.
942 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
943 // in order to avoid memory leak, stale entries are purged whenever a dependency list
944 // is changed (both on addition and removal). Though memory reclamation is delayed,
945 // it avoids indefinite memory usage growth.
946 deps.add_dependent_nmethod(nm);
947 }
948
949 void MethodHandles::clean_dependency_context(oop call_site) {
950 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
951 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
952 deps.clean_unloading_dependents();
953 }
954
955 void MethodHandles::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, Handle call_site, Handle target) {
956 assert_lock_strong(Compile_lock);
957
958 CallSiteDepChange changes(call_site, target);
959 {
960 NoSafepointVerifier nsv;
961 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
962
963 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site());
964 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
965 deps.mark_dependent_nmethods(deopt_scope, changes);
966 }
967 }
968
969 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
970 if (log_is_enabled(Info, methodhandles)) {
971 const char* name = vmIntrinsics::name_at(iid);
972 if (*name == '_') name += 1;
973 const size_t len = strlen(name) + 50;
974 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
975 const char* suffix = "";
976 if (is_signature_polymorphic(iid)) {
977 if (is_signature_polymorphic_static(iid))
978 suffix = "/static";
979 else
980 suffix = "/private";
981 }
982 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
983 trace_method_handle(_masm, qname);
984 // LSan appears unable to keep track of qname, ignore it.
985 LSAN_IGNORE_OBJECT(qname);
986 // Note: Don't free the allocated char array because it's used
987 // during runtime.
988 }
989 }
990
991 //
992 // Here are the native methods in java.lang.invoke.MethodHandleNatives
993 // They are the private interface between this JVM and the HotSpot-specific
994 // Java code that implements JSR 292 method handles.
995 //
996 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
997 // that intrinsic (non-JNI) native methods are defined in HotSpot.
998 //
999
1000 #ifndef PRODUCT
1001 #define EACH_NAMED_CON(template, requirement) \
1002 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1003 template(java_lang_invoke_MemberName,MN_IS_OBJECT_CONSTRUCTOR) \
1004 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1005 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1006 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1007 template(java_lang_invoke_MemberName,MN_TRUSTED_FINAL) \
1008 template(java_lang_invoke_MemberName,MN_HIDDEN_MEMBER) \
1009 template(java_lang_invoke_MemberName,MN_FLAT_FIELD) \
1010 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1011 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1012 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \
1013 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \
1014 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \
1015 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \
1016 template(java_lang_invoke_MemberName,MN_MODULE_MODE) \
1017 template(java_lang_invoke_MemberName,MN_UNCONDITIONAL_MODE) \
1018 template(java_lang_invoke_MemberName,MN_TRUSTED_MODE) \
1019 /*end*/
1020
1021 #define IGNORE_REQ(req_expr) /* req_expr */
1022 #define ONE_PLUS(scope,value) 1+
1023 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1024 #define VALUE_COMMA(scope,value) scope::value,
1025 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1026 #define STRING_NULL(scope,value) #value "\0"
1027 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1028
1029 static bool advertise_con_value(int which) {
1030 if (which < 0) return false;
1031 bool ok = true;
1032 int count = 0;
1033 #define INC_COUNT(scope,value) \
1034 ++count;
1035 #define CHECK_REQ(req_expr) \
1036 if (which < count) return ok; \
1037 ok = (req_expr);
1038 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1039 #undef INC_COUNT
1040 #undef CHECK_REQ
1041 assert(count == con_value_count, "");
1042 if (which < count) return ok;
1043 return false;
1044 }
1045
1046 #undef ONE_PLUS
1047 #undef VALUE_COMMA
1048 #undef STRING_NULL
1049 #undef EACH_NAMED_CON
1050 #endif // PRODUCT
1051
1052 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1053 #ifndef PRODUCT
1054 if (advertise_con_value(which)) {
1055 assert(which >= 0 && which < con_value_count, "");
1056 int con = con_values[which];
1057 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1058 if (box.not_null() && box->klass() == Universe::objectArrayKlass() && box->length() > 0) {
1059 const char* str = &con_names[0];
1060 for (int i = 0; i < which; i++)
1061 str += strlen(str) + 1; // skip name and null
1062 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1063 box->obj_at_put(0, name);
1064 }
1065 return con;
1066 }
1067 #endif
1068 return 0;
1069 }
1070 JVM_END
1071
1072 // void init(MemberName self, AccessibleObject ref)
1073 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1074 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1075 if (target_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1076 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1077 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1078 MethodHandles::init_MemberName(mname, target, CHECK);
1079 }
1080 JVM_END
1081
1082 // void expand(MemberName self)
1083 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1084 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1085 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1086 MethodHandles::expand_MemberName(mname, 0, CHECK);
1087 }
1088 JVM_END
1089
1090 // void resolve(MemberName self, Class<?> caller)
1091 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1092 jint lookup_mode, jboolean speculative_resolve)) {
1093 if (mname_jh == nullptr) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1094 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1095
1096 // The trusted Java code that calls this method should already have performed
1097 // access checks on behalf of the given caller. But, we can verify this.
1098 // This only verifies from the context of the lookup class. It does not
1099 // verify the lookup context for a Lookup object teleported from one module
1100 // to another. Such Lookup object can only access the intersection of the set
1101 // of accessible classes from both lookup class and previous lookup class.
1102 if (VerifyMethodHandles && (lookup_mode & LM_TRUSTED) == LM_TRUSTED && caller_jh != nullptr &&
1103 java_lang_invoke_MemberName::clazz(mname()) != nullptr) {
1104 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1105 if (reference_klass != nullptr && reference_klass->is_objArray_klass()) {
1106 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1107 }
1108
1109 // Reflection::verify_class_access can only handle instance classes.
1110 if (reference_klass != nullptr && reference_klass->is_instance_klass()) {
1111 // Emulate LinkResolver::check_klass_accessability.
1112 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1113 // access check on behalf of the caller if this is not a public lookup
1114 // i.e. lookup mode is not UNCONDITIONAL
1115 if ((lookup_mode & LM_UNCONDITIONAL) == 0
1116 && Reflection::verify_class_access(caller,
1117 InstanceKlass::cast(reference_klass),
1118 true) != Reflection::ACCESS_OK) {
1119 ResourceMark rm(THREAD);
1120 stringStream ss;
1121 ss.print("caller %s tried to access %s", caller->class_in_module_of_loader(),
1122 reference_klass->class_in_module_of_loader());
1123 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), ss.as_string());
1124 }
1125 }
1126 }
1127
1128 Klass* caller = caller_jh == nullptr ? nullptr :
1129 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1130 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, lookup_mode,
1131 speculative_resolve == JNI_TRUE,
1132 CHECK_NULL);
1133
1134 if (resolved.is_null()) {
1135 int flags = java_lang_invoke_MemberName::flags(mname());
1136 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1137 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1138 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1139 }
1140 if (speculative_resolve) {
1141 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1142 return nullptr;
1143 }
1144 if ((flags & ALL_KINDS) == IS_FIELD) {
1145 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1146 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1147 (flags & ALL_KINDS) == IS_OBJECT_CONSTRUCTOR) {
1148 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1149 } else {
1150 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1151 }
1152 }
1153
1154 return JNIHandles::make_local(THREAD, resolved());
1155 }
1156 JVM_END
1157
1158 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1159 if (mname == nullptr ||
1160 java_lang_invoke_MemberName::clazz(mname) == nullptr) {
1161 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1162 } else {
1163 int flags = java_lang_invoke_MemberName::flags(mname);
1164 if ((flags & IS_FIELD) != 0 &&
1165 (must_be_static
1166 ? (flags & JVM_ACC_STATIC) != 0
1167 : (flags & JVM_ACC_STATIC) == 0)) {
1168 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname);
1169 return (jlong) vmindex;
1170 }
1171 }
1172 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1173 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1174 return 0;
1175 }
1176
1177 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1178 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1179 }
1180 JVM_END
1181
1182 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1183 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1184 }
1185 JVM_END
1186
1187 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1188 // use the other function to perform sanity checks:
1189 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1190 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1191 return JNIHandles::make_local(THREAD, clazz);
1192 }
1193 JVM_END
1194
1195 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1196 if (mname_jh == nullptr) return nullptr;
1197 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1198 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1199 objArrayHandle result = oopFactory::new_objArray_handle(vmClasses::Object_klass(), 2, CHECK_NULL);
1200 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1201 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1202 result->obj_at_put(0, x);
1203
1204 int flags = java_lang_invoke_MemberName::flags(mname());
1205 if ((flags & IS_FIELD) != 0) {
1206 x = java_lang_invoke_MemberName::clazz(mname());
1207 } else {
1208 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1209 assert(vmtarget != nullptr && vmtarget->is_method(), "vmtarget is only method");
1210 x = mname();
1211 }
1212 result->obj_at_put(1, x);
1213 return JNIHandles::make_local(THREAD, result());
1214 }
1215 JVM_END
1216
1217 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1218 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1219 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1220 DeoptimizationScope deopt_scope;
1221 {
1222 // Walk all nmethods depending on this call site.
1223 MutexLocker mu(thread, Compile_lock);
1224 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1225 java_lang_invoke_CallSite::set_target(call_site(), target());
1226 // This is assumed to be an 'atomic' operation by verification.
1227 // So keep it under lock for now.
1228 deopt_scope.deoptimize_marked();
1229 }
1230 }
1231 JVM_END
1232
1233 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1234 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1235 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1236 DeoptimizationScope deopt_scope;
1237 {
1238 // Walk all nmethods depending on this call site.
1239 MutexLocker mu(thread, Compile_lock);
1240 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1241 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1242 // This is assumed to be an 'atomic' operation by verification.
1243 // So keep it under lock for now.
1244 deopt_scope.deoptimize_marked();
1245 }
1246 }
1247 JVM_END
1248
1249 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1250 jobject caller_jh, jintArray index_info_jh,
1251 jint start, jint end,
1252 jobjectArray buf_jh, jint pos,
1253 jboolean resolve, jobject ifna_jh)) {
1254 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1255 if (caller_k == nullptr || !caller_k->is_instance_klass()) {
1256 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1257 }
1258 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1259 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1260 if (index_info_oop == nullptr ||
1261 index_info_oop->klass() != Universe::intArrayKlass() ||
1262 typeArrayOop(index_info_oop)->length() < 2) {
1263 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1264 }
1265 typeArrayHandle index_info(THREAD, index_info_oop);
1266 int bss_index_in_pool = index_info->int_at(1);
1267 // While we are here, take a quick look at the index info:
1268 if (bss_index_in_pool <= 0 ||
1269 bss_index_in_pool >= caller->constants()->length() ||
1270 index_info->int_at(0)
1271 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1272 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1273 }
1274 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1275 if (start < 0) {
1276 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1277 if (start == pseudo_index) {
1278 if (start >= end || 0 > pos || pos >= buf->length()) break;
1279 oop pseudo_arg = nullptr;
1280 switch (pseudo_index) {
1281 case -4: // bootstrap method
1282 {
1283 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool);
1284 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1285 break;
1286 }
1287 case -3: // name
1288 {
1289 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic);
1290 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1291 pseudo_arg = str();
1292 break;
1293 }
1294 case -2: // type
1295 {
1296 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic);
1297 Handle th;
1298 if (type->char_at(0) == JVM_SIGNATURE_FUNC) {
1299 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1300 } else {
1301 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1302 }
1303 pseudo_arg = th();
1304 break;
1305 }
1306 case -1: // argument count
1307 {
1308 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool);
1309 jvalue argc_value; argc_value.i = (jint)argc;
1310 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1311 break;
1312 }
1313 }
1314
1315 // Store the pseudo-argument, and advance the pointers.
1316 buf->obj_at_put(pos++, pseudo_arg);
1317 ++start;
1318 }
1319 }
1320 // When we are done with this there may be regular arguments to process too.
1321 }
1322 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1323 caller->constants()->
1324 copy_bootstrap_arguments_at(bss_index_in_pool,
1325 start, end, buf, pos,
1326 (resolve == JNI_TRUE), ifna, CHECK);
1327 }
1328 JVM_END
1329
1330 // It is called by a Cleaner object which ensures that dropped CallSites properly
1331 // deallocate their dependency information.
1332 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1333 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1334 DeoptimizationScope deopt_scope;
1335 {
1336 NoSafepointVerifier nsv;
1337 MutexLocker ml(THREAD, CodeCache_lock, Mutex::_no_safepoint_check_flag);
1338 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1339 deps.remove_and_mark_for_deoptimization_all_dependents(&deopt_scope);
1340 // This is assumed to be an 'atomic' operation by verification.
1341 // So keep it under lock for now.
1342 deopt_scope.deoptimize_marked();
1343 }
1344 }
1345 JVM_END
1346
1347 /**
1348 * Throws a java/lang/UnsupportedOperationException unconditionally.
1349 * This is required by the specification of MethodHandle.invoke if
1350 * invoked directly.
1351 */
1352 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1353 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1354 return nullptr;
1355 }
1356 JVM_END
1357
1358 /**
1359 * Throws a java/lang/UnsupportedOperationException unconditionally.
1360 * This is required by the specification of MethodHandle.invokeExact if
1361 * invoked directly.
1362 */
1363 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1364 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1365 return nullptr;
1366 }
1367 JVM_END
1368
1369 /**
1370 * Throws a java/lang/UnsupportedOperationException unconditionally.
1371 * This is required by the specification of VarHandle.{access-mode} if
1372 * invoked directly.
1373 */
1374 JVM_ENTRY(jobject, VH_UOE(JNIEnv* env, jobject vh, jobjectArray args)) {
1375 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "VarHandle access mode methods cannot be invoked reflectively");
1376 return nullptr;
1377 }
1378 JVM_END
1379
1380
1381 /// JVM_RegisterMethodHandleMethods
1382
1383 #define LANG "Ljava/lang/"
1384 #define JLINV "Ljava/lang/invoke/"
1385
1386 #define OBJ LANG "Object;"
1387 #define CLS LANG "Class;"
1388 #define STRG LANG "String;"
1389 #define CS JLINV "CallSite;"
1390 #define MT JLINV "MethodType;"
1391 #define MH JLINV "MethodHandle;"
1392 #define MEM JLINV "MemberName;"
1393 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1394
1395 #define CC (char*) /*cast a literal from (const char*)*/
1396 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1397
1398 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1399 static JNINativeMethod MHN_methods[] = {
1400 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1401 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1402 {CC "resolve", CC "(" MEM "" CLS "IZ)" MEM, FN_PTR(MHN_resolve_Mem)},
1403 // static native int getNamedCon(int which, Object[] name)
1404 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1405 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1406 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1407 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1408 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1409 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1410 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1411 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1412 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1413 };
1414
1415 static JNINativeMethod MH_methods[] = {
1416 // UnsupportedOperationException throwers
1417 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1418 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1419 };
1420 static JNINativeMethod VH_methods[] = {
1421 // UnsupportedOperationException throwers
1422 {CC "get", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1423 {CC "set", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1424 {CC "getVolatile", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1425 {CC "setVolatile", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1426 {CC "getAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1427 {CC "setRelease", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1428 {CC "getOpaque", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1429 {CC "setOpaque", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1430 {CC "compareAndSet", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1431 {CC "compareAndExchange", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1432 {CC "compareAndExchangeAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1433 {CC "compareAndExchangeRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1434 {CC "weakCompareAndSetPlain", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1435 {CC "weakCompareAndSet", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1436 {CC "weakCompareAndSetAcquire", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1437 {CC "weakCompareAndSetRelease", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1438 {CC "getAndSet", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1439 {CC "getAndSetAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1440 {CC "getAndSetRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1441 {CC "getAndAdd", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1442 {CC "getAndAddAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1443 {CC "getAndAddRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1444 {CC "getAndBitwiseOr", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1445 {CC "getAndBitwiseOrAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1446 {CC "getAndBitwiseOrRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1447 {CC "getAndBitwiseAnd", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1448 {CC "getAndBitwiseAndAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1449 {CC "getAndBitwiseAndRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1450 {CC "getAndBitwiseXor", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1451 {CC "getAndBitwiseXorAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1452 {CC "getAndBitwiseXorRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)}
1453 };
1454
1455 /**
1456 * This one function is exported, used by NativeLookup.
1457 */
1458 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1459 assert(!MethodHandles::enabled(), "must not be enabled");
1460 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
1461 assert(vmClasses::VarHandle_klass() != nullptr, "should be present");
1462
1463 oop mh_mirror = vmClasses::MethodHandle_klass()->java_mirror();
1464 oop vh_mirror = vmClasses::VarHandle_klass()->java_mirror();
1465 jclass MH_class = (jclass) JNIHandles::make_local(THREAD, mh_mirror);
1466 jclass VH_class = (jclass) JNIHandles::make_local(THREAD, vh_mirror);
1467
1468 {
1469 ThreadToNativeFromVM ttnfv(thread);
1470
1471 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1472 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1473 "register java.lang.invoke.MethodHandleNative natives");
1474
1475 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1476 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1477 "register java.lang.invoke.MethodHandle natives");
1478
1479 status = env->RegisterNatives(VH_class, VH_methods, sizeof(VH_methods)/sizeof(JNINativeMethod));
1480 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1481 "register java.lang.invoke.VarHandle natives");
1482 }
1483
1484 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1485
1486 MethodHandles::set_enabled(true);
1487 }
1488 JVM_END