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_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_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 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
141 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
142 LM_UNCONDITIONAL = java_lang_invoke_MemberName::MN_UNCONDITIONAL_MODE,
143 LM_MODULE = java_lang_invoke_MemberName::MN_MODULE_MODE,
144 LM_TRUSTED = java_lang_invoke_MemberName::MN_TRUSTED_MODE,
145 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
146 };
147
148 int MethodHandles::ref_kind_to_flags(int ref_kind) {
149 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
150 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
151 if (ref_kind_is_field(ref_kind)) {
152 flags |= IS_FIELD;
153 } else if (ref_kind_is_method(ref_kind)) {
154 flags |= IS_METHOD;
155 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
156 flags |= IS_CONSTRUCTOR;
157 }
158 return flags;
159 }
160
161 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
162 Handle empty;
163 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
164 if (!java_lang_String::is_instance(type())) {
165 return type; // already resolved
166 }
167 Symbol* signature = java_lang_String::as_symbol_or_null(type());
168 if (signature == nullptr) {
169 return empty; // no such signature exists in the VM
170 }
171 Handle resolved;
172 int flags = java_lang_invoke_MemberName::flags(mname());
173 switch (flags & ALL_KINDS) {
174 case IS_METHOD:
175 case IS_CONSTRUCTOR:
176 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
177 break;
178 case IS_FIELD:
179 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
180 break;
181 default:
182 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
183 }
184 if (resolved.is_null()) {
185 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
186 }
187 return resolved;
188 }
189
190 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
191 // This method is used from java.lang.invoke.MemberName constructors.
192 // It fills in the new MemberName from a java.lang.reflect.Member.
193 oop target_oop = target();
194 Klass* target_klass = target_oop->klass();
195 if (target_klass == vmClasses::reflect_Field_klass()) {
196 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
197 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
198 Klass* k = java_lang_Class::as_Klass(clazz);
199 if (k != nullptr && k->is_instance_klass()) {
200 fieldDescriptor fd(InstanceKlass::cast(k), slot);
201 oop mname2 = init_field_MemberName(mname, fd);
202 if (mname2 != nullptr) {
203 // Since we have the reified name and type handy, add them to the result.
204 if (java_lang_invoke_MemberName::name(mname2) == nullptr)
205 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
206 if (java_lang_invoke_MemberName::type(mname2) == nullptr)
207 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
208 }
209 return mname2;
210 }
211 } else if (target_klass == vmClasses::reflect_Method_klass()) {
212 oop clazz = java_lang_reflect_Method::clazz(target_oop);
213 int slot = java_lang_reflect_Method::slot(target_oop);
214 Klass* k = java_lang_Class::as_Klass(clazz);
215 if (k != nullptr && k->is_instance_klass()) {
216 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
217 if (m == nullptr || is_signature_polymorphic(m->intrinsic_id()))
218 return nullptr; // do not resolve unless there is a concrete signature
219 CallInfo info(m, k, CHECK_NULL);
220 return init_method_MemberName(mname, info);
221 }
222 } else if (target_klass == vmClasses::reflect_Constructor_klass()) {
223 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
224 int slot = java_lang_reflect_Constructor::slot(target_oop);
225 Klass* k = java_lang_Class::as_Klass(clazz);
226 if (k != nullptr && k->is_instance_klass()) {
227 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
228 if (m == nullptr) return nullptr;
229 CallInfo info(m, k, CHECK_NULL);
230 return init_method_MemberName(mname, info);
231 }
232 }
233 return nullptr;
234 }
235
236 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
237 assert(info.resolved_appendix().is_null(), "only normal methods here");
238 methodHandle m(Thread::current(), info.resolved_method());
239 assert(m.not_null(), "null method handle");
240 InstanceKlass* m_klass = m->method_holder();
241 assert(m_klass != nullptr, "null holder for method handle");
242 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
243 int vmindex = Method::invalid_vtable_index;
244 LogTarget(Debug, methodhandles, indy) lt_indy;
245
246 switch (info.call_kind()) {
247 case CallInfo::itable_call:
248 vmindex = info.itable_index();
249 // More importantly, the itable index only works with the method holder.
250 assert(m_klass->verify_itable_index(vmindex), "");
251 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
252 if (lt_indy.is_enabled()) {
253 ResourceMark rm;
254 LogStream ls(lt_indy);
255 ls.print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
256 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
257 vmindex);
258 m->access_flags().print_on(&ls);
259 if (!m->is_abstract()) {
260 if (!m->is_private()) {
261 ls.print("default");
262 }
263 else {
264 ls.print("private-intf");
265 }
266 }
267 ls.cr();
268 }
269 break;
270
271 case CallInfo::vtable_call:
272 vmindex = info.vtable_index();
273 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
274 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
275 if (m_klass->is_interface()) {
276 // This is a vtable call to an interface method (abstract "miranda method" or default method).
277 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
278 // (LinkResolver should help us figure this out.)
279 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass");
280 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass());
281 if (m_klass_non_interface->is_interface()) {
282 m_klass_non_interface = vmClasses::Object_klass();
283 #ifdef ASSERT
284 { ResourceMark rm;
285 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
286 assert(m->name() == m2->name() && m->signature() == m2->signature(),
287 "at %d, %s != %s", vmindex,
288 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
289 }
290 #endif //ASSERT
291 }
292 if (!m->is_public()) {
293 assert(m->is_public(), "virtual call must be to public interface method");
294 return nullptr; // elicit an error later in product build
295 }
296 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
297 m_klass = m_klass_non_interface;
298 }
299 if (lt_indy.is_enabled()) {
300 ResourceMark rm;
301 LogStream ls(lt_indy);
302 ls.print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
303 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
304 m_klass->internal_name(), vmindex);
305 m->access_flags().print_on(&ls);
306 if (m->is_default_method()) {
307 ls.print("default");
308 }
309 ls.cr();
310 }
311 break;
312
313 case CallInfo::direct_call:
314 vmindex = Method::nonvirtual_vtable_index;
315 if (m->is_static()) {
316 assert(!m->is_static_initializer(), "Cannot be static initializer");
317 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
318 } else if (m->is_object_initializer()) {
319 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
320 } else {
321 // "special" reflects that this is a direct call, not that it
322 // necessarily originates from an invokespecial. We can also do
323 // direct calls for private and/or final non-static methods.
324 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
325 }
326 break;
327
328 default: assert(false, "bad CallInfo"); return nullptr;
329 }
330
331 // @CallerSensitive annotation detected
332 if (m->caller_sensitive()) {
333 flags |= CALLER_SENSITIVE;
334 }
335
336 Handle resolved_method = info.resolved_method_name();
337 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(),
338 "Should not change after link resolution");
339
340 oop mname_oop = mname();
341 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
342 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
343 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
344 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
345 // Note: name and type can be lazily computed by resolve_MemberName,
346 // if Java code needs them as resolved String and MethodType objects.
347 // If relevant, the vtable or itable value is stored as vmindex.
348 // This is done eagerly, since it is readily available without
349 // constructing any new objects.
350 return mname();
351 }
352
353 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
354 InstanceKlass* ik = fd.field_holder();
355 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
356 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
357 if (fd.is_trusted_final()) flags |= TRUSTED_FINAL;
358 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
359 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
360
361 oop mname_oop = mname();
362 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
363 java_lang_invoke_MemberName::set_method (mname_oop, nullptr);
364 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
365 java_lang_invoke_MemberName::set_clazz (mname_oop, ik->java_mirror());
366
367 oop type = field_signature_type_or_null(fd.signature());
368 oop name = field_name_or_null(fd.name());
369 if (name != nullptr)
370 java_lang_invoke_MemberName::set_name(mname_oop, name);
371 if (type != nullptr)
372 java_lang_invoke_MemberName::set_type(mname_oop, type);
373 // Note: name and type can be lazily computed by resolve_MemberName,
374 // if Java code needs them as resolved String and Class objects.
375 // Note that the incoming type oop might be pre-resolved (non-null).
376 // The base clazz and field offset (vmindex) must be eagerly stored,
377 // because they unambiguously identify the field.
378 // Although the fieldDescriptor::_index would also identify the field,
379 // we do not use it, because it is harder to decode.
380 // TO DO: maybe intern mname_oop
381 return mname();
382 }
383
384 // JVM 2.9 Special Methods:
385 // A method is signature polymorphic if and only if all of the following conditions hold :
386 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
387 // * It has a single formal parameter of type Object[].
388 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
389 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
390 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
391 if (klass == nullptr)
392 return false;
393 // The following test will fail spuriously during bootstrap of MethodHandle itself:
394 // if (klass != vmClasses::MethodHandle_klass())
395 // Test the name instead:
396 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
397 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
398 return false;
399 }
400
401 // Look up signature polymorphic method with polymorphic return type
402 Symbol* poly_sig = vmSymbols::object_array_object_signature();
403 InstanceKlass* iklass = InstanceKlass::cast(klass);
404 Method* m = iklass->find_method(name, poly_sig);
405 if (m != nullptr) {
406 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
407 int flags = m->access_flags().as_int();
408 if ((flags & required) == required) {
409 return true;
410 }
411 }
412
413 // Look up signature polymorphic method with non-polymorphic (non Object) return type
414 int me;
415 int ms = iklass->find_method_by_name(name, &me);
416 if (ms == -1) return false;
417 for (; ms < me; ms++) {
418 Method* m = iklass->methods()->at(ms);
419 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
420 int flags = m->access_flags().as_int();
421 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
422 return true;
423 }
424 }
425 return false;
426 }
427
428
429 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
430 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
431 switch (iid) {
432 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
433 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
434 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
435 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
436 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
437 case vmIntrinsics::_linkToNative: return vmSymbols::linkToNative_name();
438 default:
439 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
440 }
441 }
442
443 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
444 switch(id) {
445 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
446 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
447 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
448 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
449 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
450 default:
451 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
452 }
453 }
454
455 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
456 switch (iid) {
457 case vmIntrinsics::_invokeBasic: return 0;
458 case vmIntrinsics::_linkToNative: return 0;
459 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
460 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
461 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
462 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
463 default:
464 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
465 }
466 }
467
468 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
469 vmSymbolID name_id = vmSymbols::find_sid(name);
470 switch (name_id) {
471 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
472 case VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
473 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
474 case VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
475
476 // There is one static signature-polymorphic method for each JVM invocation mode.
477 case VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
478 case VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
479 case VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
480 case VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
481 case VM_SYMBOL_ENUM_NAME(linkToNative_name): return vmIntrinsics::_linkToNative;
482 default: break;
483 }
484
485 // Cover the case of invokeExact and any future variants of invokeFoo.
486 Klass* mh_klass = vmClasses::klass_at(VM_CLASS_ID(MethodHandle_klass));
487 if (mh_klass != nullptr && is_method_handle_invoke_name(mh_klass, name)) {
488 return vmIntrinsics::_invokeGeneric;
489 }
490
491 // Cover the case of methods on VarHandle.
492 Klass* vh_klass = vmClasses::klass_at(VM_CLASS_ID(VarHandle_klass));
493 if (vh_klass != nullptr && is_method_handle_invoke_name(vh_klass, name)) {
494 return vmIntrinsics::_invokeGeneric;
495 }
496
497 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
498 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
499 return vmIntrinsics::_none;
500 }
501
502 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
503 if (klass != nullptr &&
504 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
505 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
506 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
507 if (iid != vmIntrinsics::_none)
508 return iid;
509 if (is_method_handle_invoke_name(klass, name))
510 return vmIntrinsics::_invokeGeneric;
511 }
512 return vmIntrinsics::_none;
513 }
514
515 // Returns true if method is signature polymorphic and public
516 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
517 if (is_signature_polymorphic_name(klass, name)) {
518 InstanceKlass* iklass = InstanceKlass::cast(klass);
519 int me;
520 int ms = iklass->find_method_by_name(name, &me);
521 assert(ms != -1, "");
522 for (; ms < me; ms++) {
523 Method* m = iklass->methods()->at(ms);
524 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
525 int flags = m->access_flags().as_int();
526 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
527 return true;
528 }
529 }
530 }
531 return false;
532 }
533
534 // convert the external string or reflective type to an internal signature
535 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
536 if (java_lang_invoke_MethodType::is_instance(type_str)) {
537 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
538 } else if (java_lang_Class::is_instance(type_str)) {
539 return java_lang_Class::as_signature(type_str, false);
540 } else if (java_lang_String::is_instance(type_str)) {
541 if (intern_if_not_found) {
542 return java_lang_String::as_symbol(type_str);
543 } else {
544 return java_lang_String::as_symbol_or_null(type_str);
545 }
546 } else {
547 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", nullptr);
548 }
549 }
550
551 static const char OBJ_SIG[] = "Ljava/lang/Object;";
552 enum { OBJ_SIG_LEN = 18 };
553
554 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
555 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
556 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
557 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) {
558 switch (ss.type()) {
559 case T_OBJECT:
560 // only java/lang/Object is valid here
561 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, OBJ_SIG_LEN) != 0)
562 return false;
563 break;
564 case T_VOID:
565 case T_INT:
566 case T_LONG:
567 case T_FLOAT:
568 case T_DOUBLE:
569 break;
570 default:
571 // subword types (T_BYTE etc.), Q-descriptors, arrays
572 return false;
573 }
574 }
575 return true;
576 }
577
578 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg) {
579 Symbol* bsig = nullptr;
580 if (sig == nullptr) {
581 return sig;
582 } else if (is_basic_type_signature(sig)) {
583 sig->increment_refcount();
584 return sig; // that was easy
585 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) {
586 BasicType bt = Signature::basic_type(sig);
587 if (is_subword_type(bt)) {
588 bsig = vmSymbols::int_signature();
589 } else {
590 assert(is_reference_type(bt), "is_basic_type_signature was false");
591 bsig = vmSymbols::object_signature();
592 }
593 } else {
594 ResourceMark rm;
595 stringStream buffer(128);
596 buffer.put(JVM_SIGNATURE_FUNC);
597 int arg_pos = 0, keep_arg_pos = -1;
598 if (keep_last_arg)
599 keep_arg_pos = ArgumentCount(sig).size() - 1;
600 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
601 BasicType bt = ss.type();
602 size_t this_arg_pos = buffer.size();
603 if (ss.at_return_type()) {
604 buffer.put(JVM_SIGNATURE_ENDFUNC);
605 }
606 if (arg_pos == keep_arg_pos) {
607 buffer.write((char*) ss.raw_bytes(),
608 (int) ss.raw_length());
609 } else if (is_reference_type(bt)) {
610 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
611 } else {
612 if (is_subword_type(bt))
613 bt = T_INT;
614 buffer.put(type2char(bt));
615 }
616 arg_pos++;
617 }
618 const char* sigstr = buffer.base();
619 int siglen = (int) buffer.size();
620 bsig = SymbolTable::new_symbol(sigstr, siglen);
621 }
622 assert(is_basic_type_signature(bsig) ||
623 // detune assert in case the injected argument is not a basic type:
624 keep_last_arg, "");
625 return bsig;
626 }
627
628 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
629 Symbol* sig) {
630 st = st ? st : tty;
631 bool prev_type = false;
632 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC);
633 if (is_method) st->put(JVM_SIGNATURE_FUNC);
634 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
635 if (ss.at_return_type())
636 st->put(JVM_SIGNATURE_ENDFUNC);
637 else if (prev_type)
638 st->put(',');
639 const char* cp = (const char*) ss.raw_bytes();
640 if (ss.is_array()) {
641 st->put(JVM_SIGNATURE_ARRAY);
642 if (ss.array_prefix_length() == 1)
643 st->put(cp[1]);
644 else
645 st->put(JVM_SIGNATURE_CLASS);
646 } else {
647 st->put(cp[0]);
648 }
649 }
650 }
651
652
653
654 static oop object_java_mirror() {
655 return vmClasses::Object_klass()->java_mirror();
656 }
657
658 oop MethodHandles::field_name_or_null(Symbol* s) {
659 if (s == nullptr) return nullptr;
660 return StringTable::lookup(s);
661 }
662
663 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
664 if (s == nullptr) return nullptr;
665 BasicType bt = Signature::basic_type(s);
666 if (is_java_primitive(bt)) {
667 assert(s->utf8_length() == 1, "");
668 return java_lang_Class::primitive_mirror(bt);
669 }
670 // Here are some more short cuts for common types.
671 // They are optional, since reference types can be resolved lazily.
672 if (bt == T_OBJECT) {
673 if (s == vmSymbols::object_signature()) {
674 return object_java_mirror();
675 } else if (s == vmSymbols::class_signature()) {
676 return vmClasses::Class_klass()->java_mirror();
677 } else if (s == vmSymbols::string_signature()) {
678 return vmClasses::String_klass()->java_mirror();
679 }
680 }
681 return nullptr;
682 }
683
684 // An unresolved member name is a mere symbolic reference.
685 // Resolving it plants a vmtarget/vmindex in it,
686 // which refers directly to JVM internals.
687 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, int lookup_mode,
688 bool speculative_resolve, TRAPS) {
689 Handle empty;
690 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
691
692 if (java_lang_invoke_MemberName::vmtarget(mname()) != nullptr) {
693 // Already resolved.
694 DEBUG_ONLY(intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()));
695 assert(vmindex >= Method::nonvirtual_vtable_index, "");
696 return mname;
697 }
698
699 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
700 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
701 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
702 int flags = java_lang_invoke_MemberName::flags(mname());
703 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
704 if (!ref_kind_is_valid(ref_kind)) {
705 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
706 }
707
708 DEBUG_ONLY(intptr_t old_vmindex);
709 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
710
711 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
712 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
713 }
714
715 InstanceKlass* defc = nullptr;
716 {
717 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
718 if (defc_klass == nullptr) return empty; // a primitive; no resolution possible
719 if (!defc_klass->is_instance_klass()) {
720 if (!defc_klass->is_array_klass()) return empty;
721 defc_klass = vmClasses::Object_klass();
722 }
723 defc = InstanceKlass::cast(defc_klass);
724 }
725 if (defc == nullptr) {
726 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
727 }
728 defc->link_class(CHECK_(empty)); // possible safepoint
729
730 // convert the external string name to an internal symbol
731 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
732 if (name == nullptr) return empty; // no such name
733 if (name == vmSymbols::class_initializer_name())
734 return empty; // illegal name
735
736 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
737 if ((flags & ALL_KINDS) == IS_METHOD &&
738 (defc == vmClasses::MethodHandle_klass() || defc == vmClasses::VarHandle_klass()) &&
739 (ref_kind == JVM_REF_invokeVirtual ||
740 ref_kind == JVM_REF_invokeSpecial ||
741 // static invocation mode is required for _linkToVirtual, etc.:
742 ref_kind == JVM_REF_invokeStatic)) {
743 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
744 if (iid != vmIntrinsics::_none &&
745 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
746 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
747 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
748 mh_invoke_id = iid;
749 }
750 }
751
752 // convert the external string or reflective type to an internal signature
753 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
754 if (type == nullptr) return empty; // no such signature exists in the VM
755
756 // skip access check if it's trusted lookup
757 LinkInfo::AccessCheck access_check = caller != nullptr ?
758 LinkInfo::AccessCheck::required :
759 LinkInfo::AccessCheck::skip;
760 // skip loader constraints if it's trusted lookup or a public lookup
761 LinkInfo::LoaderConstraintCheck loader_constraint_check = (caller != nullptr && (lookup_mode & LM_UNCONDITIONAL) == 0) ?
762 LinkInfo::LoaderConstraintCheck::required :
763 LinkInfo::LoaderConstraintCheck::skip;
764
765 // Time to do the lookup.
766 switch (flags & ALL_KINDS) {
767 case IS_METHOD:
768 {
769 CallInfo result;
770 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
771 {
772 assert(!HAS_PENDING_EXCEPTION, "");
773 if (ref_kind == JVM_REF_invokeStatic) {
774 LinkResolver::resolve_static_call(result,
775 link_info, false, THREAD);
776 } else if (ref_kind == JVM_REF_invokeInterface) {
777 LinkResolver::resolve_interface_call(result, Handle(), defc,
778 link_info, false, THREAD);
779 } else if (mh_invoke_id != vmIntrinsics::_none) {
780 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
781 LinkResolver::resolve_handle_call(result, link_info, THREAD);
782 } else if (ref_kind == JVM_REF_invokeSpecial) {
783 LinkResolver::resolve_special_call(result, Handle(),
784 link_info, THREAD);
785 } else if (ref_kind == JVM_REF_invokeVirtual) {
786 LinkResolver::resolve_virtual_call(result, Handle(), defc,
787 link_info, false, THREAD);
788 } else {
789 assert(false, "ref_kind=%d", ref_kind);
790 }
791 if (HAS_PENDING_EXCEPTION) {
792 if (speculative_resolve) {
793 CLEAR_PENDING_EXCEPTION;
794 }
795 return empty;
796 }
797 }
798 if (result.resolved_appendix().not_null()) {
799 // The resolved MemberName must not be accompanied by an appendix argument,
800 // since there is no way to bind this value into the MemberName.
801 // Caller is responsible to prevent this from happening.
802 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
803 }
804 result.set_resolved_method_name(CHECK_(empty));
805 oop mname2 = init_method_MemberName(mname, result);
806 return Handle(THREAD, mname2);
807 }
808 case IS_CONSTRUCTOR:
809 {
810 CallInfo result;
811 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
812 {
813 assert(!HAS_PENDING_EXCEPTION, "");
814 if (name == vmSymbols::object_initializer_name()) {
815 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
816 } else {
817 break; // will throw after end of switch
818 }
819 if (HAS_PENDING_EXCEPTION) {
820 if (speculative_resolve) {
821 CLEAR_PENDING_EXCEPTION;
822 }
823 return empty;
824 }
825 }
826 assert(result.is_statically_bound(), "");
827 result.set_resolved_method_name(CHECK_(empty));
828 oop mname2 = init_method_MemberName(mname, result);
829 return Handle(THREAD, mname2);
830 }
831 case IS_FIELD:
832 {
833 fieldDescriptor result; // find_field initializes fd if found
834 {
835 assert(!HAS_PENDING_EXCEPTION, "");
836 LinkInfo link_info(defc, name, type, caller, LinkInfo::AccessCheck::skip, loader_constraint_check);
837 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
838 if (HAS_PENDING_EXCEPTION) {
839 if (speculative_resolve) {
840 CLEAR_PENDING_EXCEPTION;
841 }
842 return empty;
843 }
844 }
845 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
846 return Handle(THREAD, mname2);
847 }
848 default:
849 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
850 }
851
852 return empty;
853 }
854
855 // Conversely, a member name which is only initialized from JVM internals
856 // may have null defc, name, and type fields.
857 // Resolving it plants a vmtarget/vmindex in it,
858 // which refers directly to JVM internals.
859 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
860 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
861
862 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != nullptr);
863 bool have_name = (java_lang_invoke_MemberName::name(mname()) != nullptr);
864 bool have_type = (java_lang_invoke_MemberName::type(mname()) != nullptr);
865 int flags = java_lang_invoke_MemberName::flags(mname());
866
867 if (suppress != 0) {
868 if (suppress & _suppress_defc) have_defc = true;
869 if (suppress & _suppress_name) have_name = true;
870 if (suppress & _suppress_type) have_type = true;
871 }
872
873 if (have_defc && have_name && have_type) return; // nothing needed
874
875 switch (flags & ALL_KINDS) {
876 case IS_METHOD:
877 case IS_CONSTRUCTOR:
878 {
879 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
880 if (vmtarget == nullptr) {
881 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
882 }
883 methodHandle m(THREAD, vmtarget);
884 DEBUG_ONLY(vmtarget = nullptr); // safety
885 if (!have_defc) {
886 InstanceKlass* defc = m->method_holder();
887 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
888 }
889 if (!have_name) {
890 //not java_lang_String::create_from_symbol; let's intern member names
891 oop name = StringTable::intern(m->name(), CHECK);
892 java_lang_invoke_MemberName::set_name(mname(), name);
893 }
894 if (!have_type) {
895 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
896 java_lang_invoke_MemberName::set_type(mname(), type());
897 }
898 return;
899 }
900 case IS_FIELD:
901 {
902 oop clazz = java_lang_invoke_MemberName::clazz(mname());
903 if (clazz == nullptr) {
904 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
905 }
906 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
907 DEBUG_ONLY(clazz = nullptr); // safety
908 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
909 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
910 fieldDescriptor fd; // find_field initializes fd if found
911 if (!defc->find_field_from_offset(checked_cast<int>(vmindex), is_static, &fd))
912 break; // cannot expand
913 if (!have_name) {
914 //not java_lang_String::create_from_symbol; let's intern member names
915 oop name = StringTable::intern(fd.name(), CHECK);
916 java_lang_invoke_MemberName::set_name(mname(), name);
917 }
918 if (!have_type) {
919 // If it is a primitive field type, don't mess with short strings like "I".
920 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
921 if (type.is_null()) {
922 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
923 }
924 java_lang_invoke_MemberName::set_type(mname(), type());
925 }
926 return;
927 }
928 }
929 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
930 }
931
932 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
933 assert_locked_or_safepoint(CodeCache_lock);
934
935 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
936 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
937 // Try to purge stale entries on updates.
938 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
939 // in order to avoid memory leak, stale entries are purged whenever a dependency list
940 // is changed (both on addition and removal). Though memory reclamation is delayed,
941 // it avoids indefinite memory usage growth.
942 deps.add_dependent_nmethod(nm);
943 }
944
945 void MethodHandles::clean_dependency_context(oop call_site) {
946 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
947 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
948 deps.clean_unloading_dependents();
949 }
950
951 void MethodHandles::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, Handle call_site, Handle target) {
952 assert_lock_strong(Compile_lock);
953
954 CallSiteDepChange changes(call_site, target);
955 {
956 NoSafepointVerifier nsv;
957 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
958
959 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site());
960 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
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_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_NESTMATE_CLASS) \
1008 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \
1009 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \
1010 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \
1011 template(java_lang_invoke_MemberName,MN_MODULE_MODE) \
1012 template(java_lang_invoke_MemberName,MN_UNCONDITIONAL_MODE) \
1013 template(java_lang_invoke_MemberName,MN_TRUSTED_MODE) \
1014 /*end*/
1015
1016 #define IGNORE_REQ(req_expr) /* req_expr */
1017 #define ONE_PLUS(scope,value) 1+
1018 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1019 #define VALUE_COMMA(scope,value) scope::value,
1020 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1021 #define STRING_NULL(scope,value) #value "\0"
1022 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1023
1024 static bool advertise_con_value(int which) {
1025 if (which < 0) return false;
1026 bool ok = true;
1027 int count = 0;
1028 #define INC_COUNT(scope,value) \
1029 ++count;
1030 #define CHECK_REQ(req_expr) \
1031 if (which < count) return ok; \
1032 ok = (req_expr);
1033 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1034 #undef INC_COUNT
1035 #undef CHECK_REQ
1036 assert(count == con_value_count, "");
1037 if (which < count) return ok;
1038 return false;
1039 }
1040
1041 #undef ONE_PLUS
1042 #undef VALUE_COMMA
1043 #undef STRING_NULL
1044 #undef EACH_NAMED_CON
1045 #endif // PRODUCT
1046
1047 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1048 #ifndef PRODUCT
1049 if (advertise_con_value(which)) {
1050 assert(which >= 0 && which < con_value_count, "");
1051 int con = con_values[which];
1052 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1053 if (box.not_null() && box->klass() == Universe::objectArrayKlass() && box->length() > 0) {
1054 const char* str = &con_names[0];
1055 for (int i = 0; i < which; i++)
1056 str += strlen(str) + 1; // skip name and null
1057 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1058 box->obj_at_put(0, name);
1059 }
1060 return con;
1061 }
1062 #endif
1063 return 0;
1064 }
1065 JVM_END
1066
1067 // void init(MemberName self, AccessibleObject ref)
1068 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1069 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1070 if (target_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1071 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1072 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1073 MethodHandles::init_MemberName(mname, target, CHECK);
1074 }
1075 JVM_END
1076
1077 // void expand(MemberName self)
1078 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1079 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1080 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1081 MethodHandles::expand_MemberName(mname, 0, CHECK);
1082 }
1083 JVM_END
1084
1085 // void resolve(MemberName self, Class<?> caller)
1086 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1087 jint lookup_mode, jboolean speculative_resolve)) {
1088 if (mname_jh == nullptr) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1089 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1090
1091 // The trusted Java code that calls this method should already have performed
1092 // access checks on behalf of the given caller. But, we can verify this.
1093 // This only verifies from the context of the lookup class. It does not
1094 // verify the lookup context for a Lookup object teleported from one module
1095 // to another. Such Lookup object can only access the intersection of the set
1096 // of accessible classes from both lookup class and previous lookup class.
1097 if (VerifyMethodHandles && (lookup_mode & LM_TRUSTED) == LM_TRUSTED && caller_jh != nullptr &&
1098 java_lang_invoke_MemberName::clazz(mname()) != nullptr) {
1099 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1100 if (reference_klass != nullptr && reference_klass->is_objArray_klass()) {
1101 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1102 }
1103
1104 // Reflection::verify_class_access can only handle instance classes.
1105 if (reference_klass != nullptr && reference_klass->is_instance_klass()) {
1106 // Emulate LinkResolver::check_klass_accessability.
1107 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1108 // access check on behalf of the caller if this is not a public lookup
1109 // i.e. lookup mode is not UNCONDITIONAL
1110 if ((lookup_mode & LM_UNCONDITIONAL) == 0
1111 && Reflection::verify_class_access(caller,
1112 InstanceKlass::cast(reference_klass),
1113 true) != Reflection::ACCESS_OK) {
1114 ResourceMark rm(THREAD);
1115 stringStream ss;
1116 ss.print("caller %s tried to access %s", caller->class_in_module_of_loader(),
1117 reference_klass->class_in_module_of_loader());
1118 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), ss.as_string());
1119 }
1120 }
1121 }
1122
1123 Klass* caller = caller_jh == nullptr ? nullptr :
1124 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1125 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, lookup_mode,
1126 speculative_resolve == JNI_TRUE,
1127 CHECK_NULL);
1128
1129 if (resolved.is_null()) {
1130 int flags = java_lang_invoke_MemberName::flags(mname());
1131 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1132 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1133 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1134 }
1135 if (speculative_resolve) {
1136 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1137 return nullptr;
1138 }
1139 if ((flags & ALL_KINDS) == IS_FIELD) {
1140 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1141 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1142 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1143 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1144 } else {
1145 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1146 }
1147 }
1148
1149 return JNIHandles::make_local(THREAD, resolved());
1150 }
1151 JVM_END
1152
1153 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1154 if (mname == nullptr ||
1155 java_lang_invoke_MemberName::clazz(mname) == nullptr) {
1156 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1157 } else {
1158 int flags = java_lang_invoke_MemberName::flags(mname);
1159 if ((flags & IS_FIELD) != 0 &&
1160 (must_be_static
1161 ? (flags & JVM_ACC_STATIC) != 0
1162 : (flags & JVM_ACC_STATIC) == 0)) {
1163 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname);
1164 return (jlong) vmindex;
1165 }
1166 }
1167 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1168 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1169 return 0;
1170 }
1171
1172 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1173 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1174 }
1175 JVM_END
1176
1177 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1178 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1179 }
1180 JVM_END
1181
1182 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1183 // use the other function to perform sanity checks:
1184 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1185 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1186 return JNIHandles::make_local(THREAD, clazz);
1187 }
1188 JVM_END
1189
1190 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1191 if (mname_jh == nullptr) return nullptr;
1192 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1193 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1194 objArrayHandle result = oopFactory::new_objArray_handle(vmClasses::Object_klass(), 2, CHECK_NULL);
1195 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1196 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1197 result->obj_at_put(0, x);
1198
1199 int flags = java_lang_invoke_MemberName::flags(mname());
1200 if ((flags & IS_FIELD) != 0) {
1201 x = java_lang_invoke_MemberName::clazz(mname());
1202 } else {
1203 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1204 assert(vmtarget != nullptr && vmtarget->is_method(), "vmtarget is only method");
1205 x = mname();
1206 }
1207 result->obj_at_put(1, x);
1208 return JNIHandles::make_local(THREAD, result());
1209 }
1210 JVM_END
1211
1212 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1213 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1214 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1215 DeoptimizationScope deopt_scope;
1216 {
1217 // Walk all nmethods depending on this call site.
1218 MutexLocker mu(thread, Compile_lock);
1219 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1220 java_lang_invoke_CallSite::set_target(call_site(), target());
1221 // This is assumed to be an 'atomic' operation by verification.
1222 // So keep it under lock for now.
1223 deopt_scope.deoptimize_marked();
1224 }
1225 }
1226 JVM_END
1227
1228 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1229 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1230 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1231 DeoptimizationScope deopt_scope;
1232 {
1233 // Walk all nmethods depending on this call site.
1234 MutexLocker mu(thread, Compile_lock);
1235 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1236 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1237 // This is assumed to be an 'atomic' operation by verification.
1238 // So keep it under lock for now.
1239 deopt_scope.deoptimize_marked();
1240 }
1241 }
1242 JVM_END
1243
1244 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1245 jobject caller_jh, jintArray index_info_jh,
1246 jint start, jint end,
1247 jobjectArray buf_jh, jint pos,
1248 jboolean resolve, jobject ifna_jh)) {
1249 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1250 if (caller_k == nullptr || !caller_k->is_instance_klass()) {
1251 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1252 }
1253 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1254 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1255 if (index_info_oop == nullptr ||
1256 index_info_oop->klass() != Universe::intArrayKlass() ||
1257 typeArrayOop(index_info_oop)->length() < 2) {
1258 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1259 }
1260 typeArrayHandle index_info(THREAD, index_info_oop);
1261 int bss_index_in_pool = index_info->int_at(1);
1262 // While we are here, take a quick look at the index info:
1263 if (bss_index_in_pool <= 0 ||
1264 bss_index_in_pool >= caller->constants()->length() ||
1265 index_info->int_at(0)
1266 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1267 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1268 }
1269 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1270 if (start < 0) {
1271 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1272 if (start == pseudo_index) {
1273 if (start >= end || 0 > pos || pos >= buf->length()) break;
1274 oop pseudo_arg = nullptr;
1275 switch (pseudo_index) {
1276 case -4: // bootstrap method
1277 {
1278 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool);
1279 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1280 break;
1281 }
1282 case -3: // name
1283 {
1284 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic);
1285 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1286 pseudo_arg = str();
1287 break;
1288 }
1289 case -2: // type
1290 {
1291 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic);
1292 Handle th;
1293 if (type->char_at(0) == JVM_SIGNATURE_FUNC) {
1294 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1295 } else {
1296 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1297 }
1298 pseudo_arg = th();
1299 break;
1300 }
1301 case -1: // argument count
1302 {
1303 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool);
1304 jvalue argc_value; argc_value.i = (jint)argc;
1305 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1306 break;
1307 }
1308 }
1309
1310 // Store the pseudo-argument, and advance the pointers.
1311 buf->obj_at_put(pos++, pseudo_arg);
1312 ++start;
1313 }
1314 }
1315 // When we are done with this there may be regular arguments to process too.
1316 }
1317 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1318 caller->constants()->
1319 copy_bootstrap_arguments_at(bss_index_in_pool,
1320 start, end, buf, pos,
1321 (resolve == JNI_TRUE), ifna, CHECK);
1322 }
1323 JVM_END
1324
1325 // It is called by a Cleaner object which ensures that dropped CallSites properly
1326 // deallocate their dependency information.
1327 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1328 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1329 DeoptimizationScope deopt_scope;
1330 {
1331 NoSafepointVerifier nsv;
1332 MutexLocker ml(THREAD, CodeCache_lock, Mutex::_no_safepoint_check_flag);
1333 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1334 deps.remove_and_mark_for_deoptimization_all_dependents(&deopt_scope);
1335 // This is assumed to be an 'atomic' operation by verification.
1336 // So keep it under lock for now.
1337 deopt_scope.deoptimize_marked();
1338 }
1339 }
1340 JVM_END
1341
1342 /**
1343 * Throws a java/lang/UnsupportedOperationException unconditionally.
1344 * This is required by the specification of MethodHandle.invoke if
1345 * invoked directly.
1346 */
1347 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1348 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1349 return nullptr;
1350 }
1351 JVM_END
1352
1353 /**
1354 * Throws a java/lang/UnsupportedOperationException unconditionally.
1355 * This is required by the specification of MethodHandle.invokeExact if
1356 * invoked directly.
1357 */
1358 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1359 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1360 return nullptr;
1361 }
1362 JVM_END
1363
1364 /**
1365 * Throws a java/lang/UnsupportedOperationException unconditionally.
1366 * This is required by the specification of VarHandle.{access-mode} if
1367 * invoked directly.
1368 */
1369 JVM_ENTRY(jobject, VH_UOE(JNIEnv* env, jobject vh, jobjectArray args)) {
1370 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "VarHandle access mode methods cannot be invoked reflectively");
1371 return nullptr;
1372 }
1373 JVM_END
1374
1375
1376 /// JVM_RegisterMethodHandleMethods
1377
1378 #define LANG "Ljava/lang/"
1379 #define JLINV "Ljava/lang/invoke/"
1380
1381 #define OBJ LANG "Object;"
1382 #define CLS LANG "Class;"
1383 #define STRG LANG "String;"
1384 #define CS JLINV "CallSite;"
1385 #define MT JLINV "MethodType;"
1386 #define MH JLINV "MethodHandle;"
1387 #define MEM JLINV "MemberName;"
1388 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1389
1390 #define CC (char*) /*cast a literal from (const char*)*/
1391 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1392
1393 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1394 static JNINativeMethod MHN_methods[] = {
1395 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1396 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1397 {CC "resolve", CC "(" MEM "" CLS "IZ)" MEM, FN_PTR(MHN_resolve_Mem)},
1398 // static native int getNamedCon(int which, Object[] name)
1399 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1400 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1401 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1402 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1403 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1404 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1405 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1406 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1407 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1408 };
1409
1410 static JNINativeMethod MH_methods[] = {
1411 // UnsupportedOperationException throwers
1412 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1413 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1414 };
1415 static JNINativeMethod VH_methods[] = {
1416 // UnsupportedOperationException throwers
1417 {CC "get", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1418 {CC "set", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1419 {CC "getVolatile", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1420 {CC "setVolatile", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1421 {CC "getAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1422 {CC "setRelease", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1423 {CC "getOpaque", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1424 {CC "setOpaque", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1425 {CC "compareAndSet", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1426 {CC "compareAndExchange", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1427 {CC "compareAndExchangeAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1428 {CC "compareAndExchangeRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1429 {CC "weakCompareAndSetPlain", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1430 {CC "weakCompareAndSet", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1431 {CC "weakCompareAndSetAcquire", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1432 {CC "weakCompareAndSetRelease", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1433 {CC "getAndSet", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1434 {CC "getAndSetAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1435 {CC "getAndSetRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1436 {CC "getAndAdd", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1437 {CC "getAndAddAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1438 {CC "getAndAddRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1439 {CC "getAndBitwiseOr", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1440 {CC "getAndBitwiseOrAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1441 {CC "getAndBitwiseOrRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1442 {CC "getAndBitwiseAnd", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1443 {CC "getAndBitwiseAndAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1444 {CC "getAndBitwiseAndRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1445 {CC "getAndBitwiseXor", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1446 {CC "getAndBitwiseXorAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1447 {CC "getAndBitwiseXorRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)}
1448 };
1449
1450 /**
1451 * This one function is exported, used by NativeLookup.
1452 */
1453 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1454 assert(!MethodHandles::enabled(), "must not be enabled");
1455 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
1456 assert(vmClasses::VarHandle_klass() != nullptr, "should be present");
1457
1458 oop mh_mirror = vmClasses::MethodHandle_klass()->java_mirror();
1459 oop vh_mirror = vmClasses::VarHandle_klass()->java_mirror();
1460 jclass MH_class = (jclass) JNIHandles::make_local(THREAD, mh_mirror);
1461 jclass VH_class = (jclass) JNIHandles::make_local(THREAD, vh_mirror);
1462
1463 {
1464 ThreadToNativeFromVM ttnfv(thread);
1465
1466 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1467 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1468 "register java.lang.invoke.MethodHandleNative natives");
1469
1470 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1471 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1472 "register java.lang.invoke.MethodHandle natives");
1473
1474 status = env->RegisterNatives(VH_class, VH_methods, sizeof(VH_methods)/sizeof(JNINativeMethod));
1475 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1476 "register java.lang.invoke.VarHandle natives");
1477 }
1478
1479 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1480
1481 MethodHandles::set_enabled(true);
1482 }
1483 JVM_END