1 /*
2 * Copyright (c) 2008, 2020, 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 "code/codeCache.hpp"
30 #include "code/dependencyContext.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "interpreter/oopMapCache.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logStream.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/oopFactory.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "memory/universe.hpp"
41 #include "oops/objArrayKlass.hpp"
42 #include "oops/objArrayOop.inline.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "oops/typeArrayOop.inline.hpp"
45 #include "prims/methodHandles.hpp"
46 #include "runtime/deoptimization.hpp"
47 #include "runtime/fieldDescriptor.inline.hpp"
48 #include "runtime/handles.inline.hpp"
49 #include "runtime/interfaceSupport.inline.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/jniHandles.inline.hpp"
52 #include "runtime/timerTrace.hpp"
53 #include "runtime/reflection.hpp"
54 #include "runtime/safepointVerifiers.hpp"
55 #include "runtime/signature.hpp"
56 #include "runtime/stubRoutines.hpp"
57 #include "utilities/exceptions.hpp"
58
59
60 /*
61 * JSR 292 reference implementation: method handles
62 * The JDK 7 reference implementation represented method handle
63 * combinations as chains. Each link in the chain had a "vmentry"
64 * field which pointed at a bit of assembly code which performed
65 * one transformation before dispatching to the next link in the chain.
66 *
67 * The current reference implementation pushes almost all code generation
68 * responsibility to (trusted) Java code. A method handle contains a
69 * pointer to its "LambdaForm", which embodies all details of the method
70 * handle's behavior. The LambdaForm is a normal Java object, managed
71 * by a runtime coded in Java.
72 */
73
74 bool MethodHandles::_enabled = false; // set true after successful native linkage
75 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
76
77 /**
78 * Generates method handle adapters. Returns 'false' if memory allocation
79 * failed and true otherwise.
80 */
81 void MethodHandles::generate_adapters() {
82 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
83 assert(_adapter_code == NULL, "generate only once");
84
85 ResourceMark rm;
86 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
87 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
88 CodeBuffer code(_adapter_code);
89 MethodHandlesAdapterGenerator g(&code);
90 g.generate();
91 code.log_section_sizes("MethodHandlesAdapterBlob");
92 }
93
94 //------------------------------------------------------------------------------
95 // MethodHandlesAdapterGenerator::generate
96 //
97 void MethodHandlesAdapterGenerator::generate() {
98 // Generate generic method handle adapters.
99 // Generate interpreter entries
100 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
101 mk <= Interpreter::method_handle_invoke_LAST;
102 mk = Interpreter::MethodKind(1 + (int)mk)) {
103 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
104 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
105 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
106 if (entry != NULL) {
107 Interpreter::set_entry_for_kind(mk, entry);
108 }
109 // If the entry is not set, it will throw AbstractMethodError.
110 }
111 }
112
113 void MethodHandles::set_enabled(bool z) {
114 if (_enabled != z) {
115 guarantee(z, "can only enable once");
116 _enabled = z;
117 }
118 }
119
120 // MemberName support
121
122 // import java_lang_invoke_MemberName.*
123 enum {
124 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
125 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
126 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
127 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
128 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
129 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
130 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
131 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
132 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
133 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
134 };
135
136 int MethodHandles::ref_kind_to_flags(int ref_kind) {
137 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
138 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
139 if (ref_kind_is_field(ref_kind)) {
140 flags |= IS_FIELD;
141 } else if (ref_kind_is_method(ref_kind)) {
142 flags |= IS_METHOD;
143 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
144 flags |= IS_CONSTRUCTOR;
145 }
146 return flags;
147 }
148
149 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
150 Handle empty;
151 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
152 if (!java_lang_String::is_instance_inlined(type())) {
153 return type; // already resolved
154 }
155 Symbol* signature = java_lang_String::as_symbol_or_null(type());
156 if (signature == NULL) {
157 return empty; // no such signature exists in the VM
158 }
159 Handle resolved;
160 int flags = java_lang_invoke_MemberName::flags(mname());
161 switch (flags & ALL_KINDS) {
162 case IS_METHOD:
163 case IS_CONSTRUCTOR:
164 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
165 break;
166 case IS_FIELD:
167 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
168 break;
169 default:
170 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
171 }
172 if (resolved.is_null()) {
173 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
174 }
175 return resolved;
176 }
177
178 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
179 // This method is used from java.lang.invoke.MemberName constructors.
180 // It fills in the new MemberName from a java.lang.reflect.Member.
181 Thread* thread = Thread::current();
182 oop target_oop = target();
183 Klass* target_klass = target_oop->klass();
184 if (target_klass == SystemDictionary::reflect_Field_klass()) {
185 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
186 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
187 Klass* k = java_lang_Class::as_Klass(clazz);
188 if (k != NULL && k->is_instance_klass()) {
189 fieldDescriptor fd(InstanceKlass::cast(k), slot);
190 oop mname2 = init_field_MemberName(mname, fd);
191 if (mname2 != NULL) {
192 // Since we have the reified name and type handy, add them to the result.
193 if (java_lang_invoke_MemberName::name(mname2) == NULL)
194 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
195 if (java_lang_invoke_MemberName::type(mname2) == NULL)
196 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
197 }
198 return mname2;
199 }
200 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
201 oop clazz = java_lang_reflect_Method::clazz(target_oop);
202 int slot = java_lang_reflect_Method::slot(target_oop);
203 Klass* k = java_lang_Class::as_Klass(clazz);
204 if (k != NULL && k->is_instance_klass()) {
205 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
206 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
207 return NULL; // do not resolve unless there is a concrete signature
208 CallInfo info(m, k, CHECK_NULL);
209 return init_method_MemberName(mname, info);
210 }
211 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
212 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
213 int slot = java_lang_reflect_Constructor::slot(target_oop);
214 Klass* k = java_lang_Class::as_Klass(clazz);
215 if (k != NULL && k->is_instance_klass()) {
216 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
217 if (m == NULL) return NULL;
218 CallInfo info(m, k, CHECK_NULL);
219 return init_method_MemberName(mname, info);
220 }
221 }
222 return NULL;
223 }
224
225 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
226 assert(info.resolved_appendix().is_null(), "only normal methods here");
227 methodHandle m(Thread::current(), info.resolved_method());
228 assert(m.not_null(), "null method handle");
229 InstanceKlass* m_klass = m->method_holder();
230 assert(m_klass != NULL, "null holder for method handle");
231 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
232 int vmindex = Method::invalid_vtable_index;
233 LogTarget(Debug, methodhandles, indy) lt_indy;
234
235 switch (info.call_kind()) {
236 case CallInfo::itable_call:
237 vmindex = info.itable_index();
238 // More importantly, the itable index only works with the method holder.
239 assert(m_klass->verify_itable_index(vmindex), "");
240 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
241 if (lt_indy.is_enabled()) {
242 ResourceMark rm;
243 LogStream ls(lt_indy);
244 ls.print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
245 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
246 vmindex);
247 m->access_flags().print_on(&ls);
248 if (!m->is_abstract()) {
249 if (!m->is_private()) {
250 ls.print("default");
251 }
252 else {
253 ls.print("private-intf");
254 }
255 }
256 ls.cr();
257 }
258 break;
259
260 case CallInfo::vtable_call:
261 vmindex = info.vtable_index();
262 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
263 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
264 if (m_klass->is_interface()) {
265 // This is a vtable call to an interface method (abstract "miranda method" or default method).
266 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
267 // (LinkResolver should help us figure this out.)
268 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass");
269 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass());
270 if (m_klass_non_interface->is_interface()) {
271 m_klass_non_interface = SystemDictionary::Object_klass();
272 #ifdef ASSERT
273 { ResourceMark rm;
274 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
275 assert(m->name() == m2->name() && m->signature() == m2->signature(),
276 "at %d, %s != %s", vmindex,
277 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
278 }
279 #endif //ASSERT
280 }
281 if (!m->is_public()) {
282 assert(m->is_public(), "virtual call must be to public interface method");
283 return NULL; // elicit an error later in product build
284 }
285 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
286 m_klass = m_klass_non_interface;
287 }
288 if (lt_indy.is_enabled()) {
289 ResourceMark rm;
290 LogStream ls(lt_indy);
291 ls.print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
292 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
293 m_klass->internal_name(), vmindex);
294 m->access_flags().print_on(&ls);
295 if (m->is_default_method()) {
296 ls.print("default");
297 }
298 ls.cr();
299 }
300 break;
301
302 case CallInfo::direct_call:
303 vmindex = Method::nonvirtual_vtable_index;
304 if (m->is_static()) {
305 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
306 } else if (m->is_initializer()) {
307 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
308 } else {
309 // "special" reflects that this is a direct call, not that it
310 // necessarily originates from an invokespecial. We can also do
311 // direct calls for private and/or final non-static methods.
312 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
313 }
314 break;
315
316 default: assert(false, "bad CallInfo"); return NULL;
317 }
318
319 // @CallerSensitive annotation detected
320 if (m->caller_sensitive()) {
321 flags |= CALLER_SENSITIVE;
322 }
323
324 Handle resolved_method = info.resolved_method_name();
325 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(),
326 "Should not change after link resolution");
327
328 oop mname_oop = mname();
329 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
330 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
331 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
332 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
333 // Note: name and type can be lazily computed by resolve_MemberName,
334 // if Java code needs them as resolved String and MethodType objects.
335 // If relevant, the vtable or itable value is stored as vmindex.
336 // This is done eagerly, since it is readily available without
337 // constructing any new objects.
338 return mname();
339 }
340
341 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
342 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
343 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
344 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
345 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
346
347 oop mname_oop = mname();
348 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
349 java_lang_invoke_MemberName::set_method (mname_oop, NULL);
350 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
351 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror());
352
353 oop type = field_signature_type_or_null(fd.signature());
354 oop name = field_name_or_null(fd.name());
355 if (name != NULL)
356 java_lang_invoke_MemberName::set_name(mname_oop, name);
357 if (type != NULL)
358 java_lang_invoke_MemberName::set_type(mname_oop, type);
359 // Note: name and type can be lazily computed by resolve_MemberName,
360 // if Java code needs them as resolved String and Class objects.
361 // Note that the incoming type oop might be pre-resolved (non-null).
362 // The base clazz and field offset (vmindex) must be eagerly stored,
363 // because they unambiguously identify the field.
364 // Although the fieldDescriptor::_index would also identify the field,
365 // we do not use it, because it is harder to decode.
366 // TO DO: maybe intern mname_oop
367 return mname();
368 }
369
370 // JVM 2.9 Special Methods:
371 // A method is signature polymorphic if and only if all of the following conditions hold :
372 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
373 // * It has a single formal parameter of type Object[].
374 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
375 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
376 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
377 if (klass == NULL)
378 return false;
379 // The following test will fail spuriously during bootstrap of MethodHandle itself:
380 // if (klass != SystemDictionary::MethodHandle_klass())
381 // Test the name instead:
382 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
383 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
384 return false;
385 }
386
387 // Look up signature polymorphic method with polymorphic return type
388 Symbol* poly_sig = vmSymbols::object_array_object_signature();
389 InstanceKlass* iklass = InstanceKlass::cast(klass);
390 Method* m = iklass->find_method(name, poly_sig);
391 if (m != NULL) {
392 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
393 int flags = m->access_flags().as_int();
394 if ((flags & required) == required) {
395 return true;
396 }
397 }
398
399 // Look up signature polymorphic method with non-polymorphic (non Object) return type
400 int me;
401 int ms = iklass->find_method_by_name(name, &me);
402 if (ms == -1) return false;
403 for (; ms < me; ms++) {
404 Method* m = iklass->methods()->at(ms);
405 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
406 int flags = m->access_flags().as_int();
407 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
408 return true;
409 }
410 }
411 return false;
412 }
413
414
415 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
416 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
417 switch (iid) {
418 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
419 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
420 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
421 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
422 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
423 default:
424 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
425 return 0;
426 }
427 }
428
429 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
430 switch(id) {
431 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
432 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
433 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
434 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
435 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
436 default:
437 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
438 return Bytecodes::_illegal;
439 }
440 }
441
442 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
443 switch (iid) {
444 case vmIntrinsics::_invokeBasic: return 0;
445 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
446 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
447 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
448 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
449 default:
450 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
451 return 0;
452 }
453 }
454
455 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
456 vmSymbols::SID name_id = vmSymbols::find_sid(name);
457 switch (name_id) {
458 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
459 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
460 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
461 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
462
463 // There is one static signature-polymorphic method for each JVM invocation mode.
464 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
465 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
466 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
467 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
468 default: break;
469 }
470
471 // Cover the case of invokeExact and any future variants of invokeFoo.
472 Klass* mh_klass = SystemDictionary::well_known_klass(
473 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
474 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
475 return vmIntrinsics::_invokeGeneric;
476 }
477
478 // Cover the case of methods on VarHandle.
479 Klass* vh_klass = SystemDictionary::well_known_klass(
480 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) );
481 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
482 return vmIntrinsics::_invokeGeneric;
483 }
484
485 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
486 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
487 return vmIntrinsics::_none;
488 }
489
490 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
491 if (klass != NULL &&
492 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
493 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
494 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
495 if (iid != vmIntrinsics::_none)
496 return iid;
497 if (is_method_handle_invoke_name(klass, name))
498 return vmIntrinsics::_invokeGeneric;
499 }
500 return vmIntrinsics::_none;
501 }
502
503 // Returns true if method is signature polymorphic and public
504 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
505 if (is_signature_polymorphic_name(klass, name)) {
506 InstanceKlass* iklass = InstanceKlass::cast(klass);
507 int me;
508 int ms = iklass->find_method_by_name(name, &me);
509 assert(ms != -1, "");
510 for (; ms < me; ms++) {
511 Method* m = iklass->methods()->at(ms);
512 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
513 int flags = m->access_flags().as_int();
514 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
515 return true;
516 }
517 }
518 }
519 return false;
520 }
521
522 // convert the external string or reflective type to an internal signature
523 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
524 if (java_lang_invoke_MethodType::is_instance(type_str)) {
525 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
526 } else if (java_lang_Class::is_instance(type_str)) {
527 return java_lang_Class::as_signature(type_str, false);
528 } else if (java_lang_String::is_instance_inlined(type_str)) {
529 if (intern_if_not_found) {
530 return java_lang_String::as_symbol(type_str);
531 } else {
532 return java_lang_String::as_symbol_or_null(type_str);
533 }
534 } else {
535 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
536 }
537 }
538
539 static const char OBJ_SIG[] = "Ljava/lang/Object;";
540 enum { OBJ_SIG_LEN = 18 };
541
542 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
543 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
544 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
545 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) {
546 switch (ss.type()) {
547 case T_OBJECT:
548 // only java/lang/Object is valid here
549 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, OBJ_SIG_LEN) != 0)
550 return false;
551 break;
552 case T_VOID:
553 case T_INT:
554 case T_LONG:
555 case T_FLOAT:
556 case T_DOUBLE:
557 break;
558 default:
559 // subword types (T_BYTE etc.), Q-descriptors, arrays
560 return false;
561 }
562 }
563 return true;
564 }
565
566 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
567 Symbol* bsig = NULL;
568 if (sig == NULL) {
569 return sig;
570 } else if (is_basic_type_signature(sig)) {
571 sig->increment_refcount();
572 return sig; // that was easy
573 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) {
574 BasicType bt = Signature::basic_type(sig);
575 if (is_subword_type(bt)) {
576 bsig = vmSymbols::int_signature();
577 } else {
578 assert(is_reference_type(bt), "is_basic_type_signature was false");
579 bsig = vmSymbols::object_signature();
580 }
581 } else {
582 ResourceMark rm;
583 stringStream buffer(128);
584 buffer.put(JVM_SIGNATURE_FUNC);
585 int arg_pos = 0, keep_arg_pos = -1;
586 if (keep_last_arg)
587 keep_arg_pos = ArgumentCount(sig).size() - 1;
588 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
589 BasicType bt = ss.type();
590 size_t this_arg_pos = buffer.size();
591 if (ss.at_return_type()) {
592 buffer.put(JVM_SIGNATURE_ENDFUNC);
593 }
594 if (arg_pos == keep_arg_pos) {
595 buffer.write((char*) ss.raw_bytes(),
596 (int) ss.raw_length());
597 } else if (is_reference_type(bt)) {
598 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
599 } else {
600 if (is_subword_type(bt))
601 bt = T_INT;
602 buffer.put(type2char(bt));
603 }
604 arg_pos++;
605 }
606 const char* sigstr = buffer.base();
607 int siglen = (int) buffer.size();
608 bsig = SymbolTable::new_symbol(sigstr, siglen);
609 }
610 assert(is_basic_type_signature(bsig) ||
611 // detune assert in case the injected argument is not a basic type:
612 keep_last_arg, "");
613 return bsig;
614 }
615
616 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
617 Symbol* sig) {
618 st = st ? st : tty;
619 bool prev_type = false;
620 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC);
621 if (is_method) st->put(JVM_SIGNATURE_FUNC);
622 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
623 if (ss.at_return_type())
624 st->put(JVM_SIGNATURE_ENDFUNC);
625 else if (prev_type)
626 st->put(',');
627 const char* cp = (const char*) ss.raw_bytes();
628 if (ss.is_array()) {
629 st->put(JVM_SIGNATURE_ARRAY);
630 if (ss.array_prefix_length() == 1)
631 st->put(cp[1]);
632 else
633 st->put(JVM_SIGNATURE_CLASS);
634 } else {
635 st->put(cp[0]);
636 }
637 }
638 }
639
640
641
642 static oop object_java_mirror() {
643 return SystemDictionary::Object_klass()->java_mirror();
644 }
645
646 oop MethodHandles::field_name_or_null(Symbol* s) {
647 if (s == NULL) return NULL;
648 return StringTable::lookup(s);
649 }
650
651 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
652 if (s == NULL) return NULL;
653 BasicType bt = Signature::basic_type(s);
654 if (is_java_primitive(bt)) {
655 assert(s->utf8_length() == 1, "");
656 return java_lang_Class::primitive_mirror(bt);
657 }
658 // Here are some more short cuts for common types.
659 // They are optional, since reference types can be resolved lazily.
660 if (bt == T_OBJECT) {
661 if (s == vmSymbols::object_signature()) {
662 return object_java_mirror();
663 } else if (s == vmSymbols::class_signature()) {
664 return SystemDictionary::Class_klass()->java_mirror();
665 } else if (s == vmSymbols::string_signature()) {
666 return SystemDictionary::String_klass()->java_mirror();
667 }
668 }
669 return NULL;
670 }
671
672
673 // An unresolved member name is a mere symbolic reference.
674 // Resolving it plants a vmtarget/vmindex in it,
675 // which refers directly to JVM internals.
676 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller,
677 bool speculative_resolve, TRAPS) {
678 Handle empty;
679 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
680
681 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
682 // Already resolved.
683 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
684 assert(vmindex >= Method::nonvirtual_vtable_index, "");
685 return mname;
686 }
687
688 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
689 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
690 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
691 int flags = java_lang_invoke_MemberName::flags(mname());
692 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
693 if (!ref_kind_is_valid(ref_kind)) {
694 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
695 }
696
697 DEBUG_ONLY(int old_vmindex);
698 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
699
700 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
701 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
702 }
703
704 InstanceKlass* defc = NULL;
705 {
706 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
707 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
708 if (!defc_klass->is_instance_klass()) {
709 if (!defc_klass->is_array_klass()) return empty;
710 defc_klass = SystemDictionary::Object_klass();
711 }
712 defc = InstanceKlass::cast(defc_klass);
713 }
714 if (defc == NULL) {
715 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
716 }
717 defc->link_class(CHECK_(empty)); // possible safepoint
718
719 // convert the external string name to an internal symbol
720 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
721 if (name == NULL) return empty; // no such name
722 if (name == vmSymbols::class_initializer_name())
723 return empty; // illegal name
724
725 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
726 if ((flags & ALL_KINDS) == IS_METHOD &&
727 (defc == SystemDictionary::MethodHandle_klass() || defc == SystemDictionary::VarHandle_klass()) &&
728 (ref_kind == JVM_REF_invokeVirtual ||
729 ref_kind == JVM_REF_invokeSpecial ||
730 // static invocation mode is required for _linkToVirtual, etc.:
731 ref_kind == JVM_REF_invokeStatic)) {
732 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
733 if (iid != vmIntrinsics::_none &&
734 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
735 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
736 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
737 mh_invoke_id = iid;
738 }
739 }
740
741 // convert the external string or reflective type to an internal signature
742 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
743 if (type == NULL) return empty; // no such signature exists in the VM
744
745 LinkInfo::AccessCheck access_check = caller != NULL ?
746 LinkInfo::needs_access_check :
747 LinkInfo::skip_access_check;
748
749 // Time to do the lookup.
750 switch (flags & ALL_KINDS) {
751 case IS_METHOD:
752 {
753 CallInfo result;
754 LinkInfo link_info(defc, name, type, caller, access_check);
755 {
756 assert(!HAS_PENDING_EXCEPTION, "");
757 if (ref_kind == JVM_REF_invokeStatic) {
758 LinkResolver::resolve_static_call(result,
759 link_info, false, THREAD);
760 } else if (ref_kind == JVM_REF_invokeInterface) {
761 LinkResolver::resolve_interface_call(result, Handle(), defc,
762 link_info, false, THREAD);
763 } else if (mh_invoke_id != vmIntrinsics::_none) {
764 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
765 LinkResolver::resolve_handle_call(result, link_info, THREAD);
766 } else if (ref_kind == JVM_REF_invokeSpecial) {
767 LinkResolver::resolve_special_call(result, Handle(),
768 link_info, THREAD);
769 } else if (ref_kind == JVM_REF_invokeVirtual) {
770 LinkResolver::resolve_virtual_call(result, Handle(), defc,
771 link_info, false, THREAD);
772 } else {
773 assert(false, "ref_kind=%d", ref_kind);
774 }
775 if (HAS_PENDING_EXCEPTION) {
776 if (speculative_resolve) {
777 CLEAR_PENDING_EXCEPTION;
778 }
779 return empty;
780 }
781 }
782 if (result.resolved_appendix().not_null()) {
783 // The resolved MemberName must not be accompanied by an appendix argument,
784 // since there is no way to bind this value into the MemberName.
785 // Caller is responsible to prevent this from happening.
786 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
787 }
788 result.set_resolved_method_name(CHECK_(empty));
789 oop mname2 = init_method_MemberName(mname, result);
790 return Handle(THREAD, mname2);
791 }
792 case IS_CONSTRUCTOR:
793 {
794 CallInfo result;
795 LinkInfo link_info(defc, name, type, caller, access_check);
796 {
797 assert(!HAS_PENDING_EXCEPTION, "");
798 if (name == vmSymbols::object_initializer_name()) {
799 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
800 } else {
801 break; // will throw after end of switch
802 }
803 if (HAS_PENDING_EXCEPTION) {
804 if (speculative_resolve) {
805 CLEAR_PENDING_EXCEPTION;
806 }
807 return empty;
808 }
809 }
810 assert(result.is_statically_bound(), "");
811 result.set_resolved_method_name(CHECK_(empty));
812 oop mname2 = init_method_MemberName(mname, result);
813 return Handle(THREAD, mname2);
814 }
815 case IS_FIELD:
816 {
817 fieldDescriptor result; // find_field initializes fd if found
818 {
819 assert(!HAS_PENDING_EXCEPTION, "");
820 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
821 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
822 if (HAS_PENDING_EXCEPTION) {
823 if (speculative_resolve) {
824 CLEAR_PENDING_EXCEPTION;
825 }
826 return empty;
827 }
828 }
829 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
830 return Handle(THREAD, mname2);
831 }
832 default:
833 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
834 }
835
836 return empty;
837 }
838
839 // Conversely, a member name which is only initialized from JVM internals
840 // may have null defc, name, and type fields.
841 // Resolving it plants a vmtarget/vmindex in it,
842 // which refers directly to JVM internals.
843 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
844 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
845
846 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
847 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
848 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
849 int flags = java_lang_invoke_MemberName::flags(mname());
850
851 if (suppress != 0) {
852 if (suppress & _suppress_defc) have_defc = true;
853 if (suppress & _suppress_name) have_name = true;
854 if (suppress & _suppress_type) have_type = true;
855 }
856
857 if (have_defc && have_name && have_type) return; // nothing needed
858
859 switch (flags & ALL_KINDS) {
860 case IS_METHOD:
861 case IS_CONSTRUCTOR:
862 {
863 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
864 if (vmtarget == NULL) {
865 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
866 }
867 methodHandle m(THREAD, vmtarget);
868 DEBUG_ONLY(vmtarget = NULL); // safety
869 if (!have_defc) {
870 InstanceKlass* defc = m->method_holder();
871 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
872 }
873 if (!have_name) {
874 //not java_lang_String::create_from_symbol; let's intern member names
875 oop name = StringTable::intern(m->name(), CHECK);
876 java_lang_invoke_MemberName::set_name(mname(), name);
877 }
878 if (!have_type) {
879 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
880 java_lang_invoke_MemberName::set_type(mname(), type());
881 }
882 return;
883 }
884 case IS_FIELD:
885 {
886 oop clazz = java_lang_invoke_MemberName::clazz(mname());
887 if (clazz == NULL) {
888 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
889 }
890 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
891 DEBUG_ONLY(clazz = NULL); // safety
892 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
893 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
894 fieldDescriptor fd; // find_field initializes fd if found
895 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
896 break; // cannot expand
897 if (!have_name) {
898 //not java_lang_String::create_from_symbol; let's intern member names
899 oop name = StringTable::intern(fd.name(), CHECK);
900 java_lang_invoke_MemberName::set_name(mname(), name);
901 }
902 if (!have_type) {
903 // If it is a primitive field type, don't mess with short strings like "I".
904 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
905 if (type.is_null()) {
906 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
907 }
908 java_lang_invoke_MemberName::set_type(mname(), type());
909 }
910 return;
911 }
912 }
913 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
914 }
915
916 int MethodHandles::find_MemberNames(Klass* k,
917 Symbol* name, Symbol* sig,
918 int mflags, Klass* caller,
919 int skip, objArrayHandle results, TRAPS) {
920 // %%% take caller into account!
921
922 Thread* thread = Thread::current();
923
924 if (k == NULL || !k->is_instance_klass()) return -1;
925
926 int rfill = 0, rlimit = results->length(), rskip = skip;
927 // overflow measurement:
928 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
929
930 int match_flags = mflags;
931 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
932 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
933 bool local_only = !(search_superc | search_intfc);
934
935 if (name != NULL) {
936 if (name->utf8_length() == 0) return 0; // a match is not possible
937 }
938 if (sig != NULL) {
939 if (sig->starts_with(JVM_SIGNATURE_FUNC))
940 match_flags &= ~(IS_FIELD | IS_TYPE);
941 else
942 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
943 }
944
945 if ((match_flags & IS_TYPE) != 0) {
946 // NYI, and Core Reflection works quite well for this query
947 }
948
949 if ((match_flags & IS_FIELD) != 0) {
950 InstanceKlass* ik = InstanceKlass::cast(k);
951 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
952 if (name != NULL && st.name() != name)
953 continue;
954 if (sig != NULL && st.signature() != sig)
955 continue;
956 // passed the filters
957 if (rskip > 0) {
958 --rskip;
959 } else if (rfill < rlimit) {
960 Handle result(thread, results->obj_at(rfill++));
961 if (!java_lang_invoke_MemberName::is_instance(result()))
962 return -99; // caller bug!
963 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
964 if (saved != result())
965 results->obj_at_put(rfill-1, saved); // show saved instance to user
966 } else if (++overflow >= overflow_limit) {
967 match_flags = 0; break; // got tired of looking at overflow
968 }
969 }
970 }
971
972 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
973 // watch out for these guys:
974 Symbol* init_name = vmSymbols::object_initializer_name();
975 Symbol* clinit_name = vmSymbols::class_initializer_name();
976 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
977 bool negate_name_test = false;
978 // fix name so that it captures the intention of IS_CONSTRUCTOR
979 if (!(match_flags & IS_METHOD)) {
980 // constructors only
981 if (name == NULL) {
982 name = init_name;
983 } else if (name != init_name) {
984 return 0; // no constructors of this method name
985 }
986 } else if (!(match_flags & IS_CONSTRUCTOR)) {
987 // methods only
988 if (name == NULL) {
989 name = init_name;
990 negate_name_test = true; // if we see the name, we *omit* the entry
991 } else if (name == init_name) {
992 return 0; // no methods of this constructor name
993 }
994 } else {
995 // caller will accept either sort; no need to adjust name
996 }
997 InstanceKlass* ik = InstanceKlass::cast(k);
998 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
999 Method* m = st.method();
1000 Symbol* m_name = m->name();
1001 if (m_name == clinit_name)
1002 continue;
1003 if (name != NULL && ((m_name != name) ^ negate_name_test))
1004 continue;
1005 if (sig != NULL && m->signature() != sig)
1006 continue;
1007 // passed the filters
1008 if (rskip > 0) {
1009 --rskip;
1010 } else if (rfill < rlimit) {
1011 Handle result(thread, results->obj_at(rfill++));
1012 if (!java_lang_invoke_MemberName::is_instance(result()))
1013 return -99; // caller bug!
1014 CallInfo info(m, NULL, CHECK_0);
1015 oop saved = MethodHandles::init_method_MemberName(result, info);
1016 if (saved != result())
1017 results->obj_at_put(rfill-1, saved); // show saved instance to user
1018 } else if (++overflow >= overflow_limit) {
1019 match_flags = 0; break; // got tired of looking at overflow
1020 }
1021 }
1022 }
1023
1024 // return number of elements we at leasted wanted to initialize
1025 return rfill + overflow;
1026 }
1027
1028 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
1029 assert_locked_or_safepoint(CodeCache_lock);
1030
1031 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1032 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1033 // Try to purge stale entries on updates.
1034 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
1035 // in order to avoid memory leak, stale entries are purged whenever a dependency list
1036 // is changed (both on addition and removal). Though memory reclamation is delayed,
1037 // it avoids indefinite memory usage growth.
1038 deps.add_dependent_nmethod(nm);
1039 }
1040
1041 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
1042 assert_locked_or_safepoint(CodeCache_lock);
1043
1044 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1045 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1046 deps.remove_dependent_nmethod(nm);
1047 }
1048
1049 void MethodHandles::clean_dependency_context(oop call_site) {
1050 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1051 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1052 deps.clean_unloading_dependents();
1053 }
1054
1055 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
1056 assert_lock_strong(Compile_lock);
1057
1058 int marked = 0;
1059 CallSiteDepChange changes(call_site, target);
1060 {
1061 NoSafepointVerifier nsv;
1062 MutexLocker mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1063
1064 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site());
1065 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1066 marked = deps.mark_dependent_nmethods(changes);
1067 }
1068 if (marked > 0) {
1069 // At least one nmethod has been marked for deoptimization.
1070 Deoptimization::deoptimize_all_marked();
1071 }
1072 }
1073
1074 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
1075 if (log_is_enabled(Info, methodhandles)) {
1076 const char* name = vmIntrinsics::name_at(iid);
1077 if (*name == '_') name += 1;
1078 const size_t len = strlen(name) + 50;
1079 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
1080 const char* suffix = "";
1081 if (is_signature_polymorphic(iid)) {
1082 if (is_signature_polymorphic_static(iid))
1083 suffix = "/static";
1084 else
1085 suffix = "/private";
1086 }
1087 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
1088 trace_method_handle(_masm, qname);
1089 // Note: Don't free the allocated char array because it's used
1090 // during runtime.
1091 }
1092 }
1093
1094 //
1095 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1096 // They are the private interface between this JVM and the HotSpot-specific
1097 // Java code that implements JSR 292 method handles.
1098 //
1099 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1100 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1101 //
1102
1103 #ifndef PRODUCT
1104 #define EACH_NAMED_CON(template, requirement) \
1105 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1106 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1107 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1108 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1109 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1110 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1111 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1112 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1113 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1114 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \
1115 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \
1116 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \
1117 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \
1118 /*end*/
1119
1120 #define IGNORE_REQ(req_expr) /* req_expr */
1121 #define ONE_PLUS(scope,value) 1+
1122 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1123 #define VALUE_COMMA(scope,value) scope::value,
1124 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1125 #define STRING_NULL(scope,value) #value "\0"
1126 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1127
1128 static bool advertise_con_value(int which) {
1129 if (which < 0) return false;
1130 bool ok = true;
1131 int count = 0;
1132 #define INC_COUNT(scope,value) \
1133 ++count;
1134 #define CHECK_REQ(req_expr) \
1135 if (which < count) return ok; \
1136 ok = (req_expr);
1137 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1138 #undef INC_COUNT
1139 #undef CHECK_REQ
1140 assert(count == con_value_count, "");
1141 if (which < count) return ok;
1142 return false;
1143 }
1144
1145 #undef ONE_PLUS
1146 #undef VALUE_COMMA
1147 #undef STRING_NULL
1148 #undef EACH_NAMED_CON
1149 #endif // PRODUCT
1150
1151 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1152 #ifndef PRODUCT
1153 if (advertise_con_value(which)) {
1154 assert(which >= 0 && which < con_value_count, "");
1155 int con = con_values[which];
1156 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1157 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1158 const char* str = &con_names[0];
1159 for (int i = 0; i < which; i++)
1160 str += strlen(str) + 1; // skip name and null
1161 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1162 box->obj_at_put(0, name);
1163 }
1164 return con;
1165 }
1166 #endif
1167 return 0;
1168 }
1169 JVM_END
1170
1171 // void init(MemberName self, AccessibleObject ref)
1172 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1173 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1174 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1175 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1176 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1177 MethodHandles::init_MemberName(mname, target, CHECK);
1178 }
1179 JVM_END
1180
1181 // void expand(MemberName self)
1182 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1183 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1184 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1185 MethodHandles::expand_MemberName(mname, 0, CHECK);
1186 }
1187 JVM_END
1188
1189 // void resolve(MemberName self, Class<?> caller)
1190 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1191 jboolean speculative_resolve)) {
1192 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1193 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1194
1195 // The trusted Java code that calls this method should already have performed
1196 // access checks on behalf of the given caller. But, we can verify this.
1197 if (VerifyMethodHandles && caller_jh != NULL &&
1198 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1199 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1200 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1201 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1202 }
1203
1204 // Reflection::verify_class_access can only handle instance classes.
1205 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1206 // Emulate LinkResolver::check_klass_accessability.
1207 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1208 if (caller != SystemDictionary::Object_klass()
1209 && Reflection::verify_class_access(caller,
1210 InstanceKlass::cast(reference_klass),
1211 true) != Reflection::ACCESS_OK) {
1212 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1213 }
1214 }
1215 }
1216
1217 Klass* caller = caller_jh == NULL ? NULL :
1218 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1219 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, speculative_resolve == JNI_TRUE,
1220 CHECK_NULL);
1221
1222 if (resolved.is_null()) {
1223 int flags = java_lang_invoke_MemberName::flags(mname());
1224 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1225 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1226 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1227 }
1228 if (speculative_resolve) {
1229 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1230 return NULL;
1231 }
1232 if ((flags & ALL_KINDS) == IS_FIELD) {
1233 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1234 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1235 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1236 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1237 } else {
1238 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1239 }
1240 }
1241
1242 return JNIHandles::make_local(THREAD, resolved());
1243 }
1244 JVM_END
1245
1246 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1247 if (mname == NULL ||
1248 java_lang_invoke_MemberName::clazz(mname) == NULL) {
1249 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1250 } else {
1251 int flags = java_lang_invoke_MemberName::flags(mname);
1252 if ((flags & IS_FIELD) != 0 &&
1253 (must_be_static
1254 ? (flags & JVM_ACC_STATIC) != 0
1255 : (flags & JVM_ACC_STATIC) == 0)) {
1256 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1257 return (jlong) vmindex;
1258 }
1259 }
1260 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1261 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1262 return 0;
1263 }
1264
1265 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1266 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1267 }
1268 JVM_END
1269
1270 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1271 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1272 }
1273 JVM_END
1274
1275 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1276 // use the other function to perform sanity checks:
1277 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1278 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1279 return JNIHandles::make_local(THREAD, clazz);
1280 }
1281 JVM_END
1282
1283 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1284 if (mname_jh == NULL) return NULL;
1285 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1286 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1287 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1288 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1289 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1290 result->obj_at_put(0, x);
1291
1292 int flags = java_lang_invoke_MemberName::flags(mname());
1293 if ((flags & IS_FIELD) != 0) {
1294 x = java_lang_invoke_MemberName::clazz(mname());
1295 } else {
1296 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1297 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1298 x = mname();
1299 }
1300 result->obj_at_put(1, x);
1301 return JNIHandles::make_local(env, result());
1302 }
1303 JVM_END
1304
1305
1306
1307 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1308 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1309 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1310 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1311 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1312 if (clazz_jh == NULL || results_jh == NULL) return -1;
1313 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1314
1315 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1316 if (results.is_null() || !results->is_objArray()) return -1;
1317
1318 TempNewSymbol name = NULL;
1319 TempNewSymbol sig = NULL;
1320 if (name_jh != NULL) {
1321 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1322 if (name == NULL) return 0; // a match is not possible
1323 }
1324 if (sig_jh != NULL) {
1325 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1326 if (sig == NULL) return 0; // a match is not possible
1327 }
1328
1329 Klass* caller = NULL;
1330 if (caller_jh != NULL) {
1331 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1332 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1333 caller = java_lang_Class::as_Klass(caller_oop);
1334 }
1335
1336 if (name != NULL && sig != NULL && results.not_null()) {
1337 // try a direct resolve
1338 // %%% TO DO
1339 }
1340
1341 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1342 caller, skip, results, CHECK_0);
1343 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1344 return res;
1345 }
1346 JVM_END
1347
1348 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1349 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1350 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1351 {
1352 // Walk all nmethods depending on this call site.
1353 MutexLocker mu(thread, Compile_lock);
1354 MethodHandles::flush_dependent_nmethods(call_site, target);
1355 java_lang_invoke_CallSite::set_target(call_site(), target());
1356 }
1357 }
1358 JVM_END
1359
1360 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1361 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1362 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1363 {
1364 // Walk all nmethods depending on this call site.
1365 MutexLocker mu(thread, Compile_lock);
1366 MethodHandles::flush_dependent_nmethods(call_site, target);
1367 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1368 }
1369 }
1370 JVM_END
1371
1372 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1373 jobject caller_jh, jintArray index_info_jh,
1374 jint start, jint end,
1375 jobjectArray buf_jh, jint pos,
1376 jboolean resolve, jobject ifna_jh)) {
1377 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1378 if (caller_k == NULL || !caller_k->is_instance_klass()) {
1379 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1380 }
1381 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1382 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1383 if (index_info_oop == NULL ||
1384 index_info_oop->klass() != Universe::intArrayKlassObj() ||
1385 typeArrayOop(index_info_oop)->length() < 2) {
1386 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1387 }
1388 typeArrayHandle index_info(THREAD, index_info_oop);
1389 int bss_index_in_pool = index_info->int_at(1);
1390 // While we are here, take a quick look at the index info:
1391 if (bss_index_in_pool <= 0 ||
1392 bss_index_in_pool >= caller->constants()->length() ||
1393 index_info->int_at(0)
1394 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1395 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1396 }
1397 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1398 if (start < 0) {
1399 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1400 if (start == pseudo_index) {
1401 if (start >= end || 0 > pos || pos >= buf->length()) break;
1402 oop pseudo_arg = NULL;
1403 switch (pseudo_index) {
1404 case -4: // bootstrap method
1405 {
1406 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool);
1407 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1408 break;
1409 }
1410 case -3: // name
1411 {
1412 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool);
1413 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1414 pseudo_arg = str();
1415 break;
1416 }
1417 case -2: // type
1418 {
1419 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool);
1420 Handle th;
1421 if (type->char_at(0) == JVM_SIGNATURE_FUNC) {
1422 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1423 } else {
1424 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1425 }
1426 pseudo_arg = th();
1427 break;
1428 }
1429 case -1: // argument count
1430 {
1431 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool);
1432 jvalue argc_value; argc_value.i = (jint)argc;
1433 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1434 break;
1435 }
1436 }
1437
1438 // Store the pseudo-argument, and advance the pointers.
1439 buf->obj_at_put(pos++, pseudo_arg);
1440 ++start;
1441 }
1442 }
1443 // When we are done with this there may be regular arguments to process too.
1444 }
1445 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1446 caller->constants()->
1447 copy_bootstrap_arguments_at(bss_index_in_pool,
1448 start, end, buf, pos,
1449 (resolve == JNI_TRUE), ifna, CHECK);
1450 }
1451 JVM_END
1452
1453 // It is called by a Cleaner object which ensures that dropped CallSites properly
1454 // deallocate their dependency information.
1455 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1456 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1457 {
1458 // Walk all nmethods depending on this call site.
1459 MutexLocker mu1(thread, Compile_lock);
1460
1461 int marked = 0;
1462 {
1463 NoSafepointVerifier nsv;
1464 MutexLocker mu2(THREAD, CodeCache_lock, Mutex::_no_safepoint_check_flag);
1465 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1466 marked = deps.remove_all_dependents();
1467 }
1468 if (marked > 0) {
1469 // At least one nmethod has been marked for deoptimization
1470 Deoptimization::deoptimize_all_marked();
1471 }
1472 }
1473 }
1474 JVM_END
1475
1476 /**
1477 * Throws a java/lang/UnsupportedOperationException unconditionally.
1478 * This is required by the specification of MethodHandle.invoke if
1479 * invoked directly.
1480 */
1481 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1482 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1483 return NULL;
1484 }
1485 JVM_END
1486
1487 /**
1488 * Throws a java/lang/UnsupportedOperationException unconditionally.
1489 * This is required by the specification of MethodHandle.invokeExact if
1490 * invoked directly.
1491 */
1492 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1493 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1494 return NULL;
1495 }
1496 JVM_END
1497
1498 /// JVM_RegisterMethodHandleMethods
1499
1500 #undef CS // Solaris builds complain
1501
1502 #define LANG "Ljava/lang/"
1503 #define JLINV "Ljava/lang/invoke/"
1504
1505 #define OBJ LANG "Object;"
1506 #define CLS LANG "Class;"
1507 #define STRG LANG "String;"
1508 #define CS JLINV "CallSite;"
1509 #define MT JLINV "MethodType;"
1510 #define MH JLINV "MethodHandle;"
1511 #define MEM JLINV "MemberName;"
1512 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1513
1514 #define CC (char*) /*cast a literal from (const char*)*/
1515 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1516
1517 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1518 static JNINativeMethod MHN_methods[] = {
1519 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1520 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1521 {CC "resolve", CC "(" MEM "" CLS "Z)" MEM, FN_PTR(MHN_resolve_Mem)},
1522 // static native int getNamedCon(int which, Object[] name)
1523 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1524 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1525 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1526 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1527 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1528 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1529 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1530 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1531 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1532 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1533 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1534 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1535 };
1536
1537 static JNINativeMethod MH_methods[] = {
1538 // UnsupportedOperationException throwers
1539 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1540 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1541 };
1542
1543 /**
1544 * This one function is exported, used by NativeLookup.
1545 */
1546 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1547 assert(!MethodHandles::enabled(), "must not be enabled");
1548 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1549
1550 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1551 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1552
1553 {
1554 ThreadToNativeFromVM ttnfv(thread);
1555
1556 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1557 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1558 "register java.lang.invoke.MethodHandleNative natives");
1559
1560 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1561 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1562 "register java.lang.invoke.MethodHandle natives");
1563 }
1564
1565 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1566
1567 MethodHandles::set_enabled(true);
1568 }
1569 JVM_END