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 TRUSTED_FINAL = java_lang_invoke_MemberName::MN_TRUSTED_FINAL,
130 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
131 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
132 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
133 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
134 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
135 };
136
137 int MethodHandles::ref_kind_to_flags(int ref_kind) {
138 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
139 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
140 if (ref_kind_is_field(ref_kind)) {
141 flags |= IS_FIELD;
142 } else if (ref_kind_is_method(ref_kind)) {
143 flags |= IS_METHOD;
144 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
145 flags |= IS_CONSTRUCTOR;
146 }
147 return flags;
148 }
149
150 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
151 Handle empty;
152 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
153 if (!java_lang_String::is_instance_inlined(type())) {
154 return type; // already resolved
155 }
156 Symbol* signature = java_lang_String::as_symbol_or_null(type());
157 if (signature == NULL) {
158 return empty; // no such signature exists in the VM
159 }
160 Handle resolved;
161 int flags = java_lang_invoke_MemberName::flags(mname());
162 switch (flags & ALL_KINDS) {
163 case IS_METHOD:
164 case IS_CONSTRUCTOR:
165 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
166 break;
167 case IS_FIELD:
168 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
169 break;
170 default:
171 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
172 }
173 if (resolved.is_null()) {
174 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
175 }
176 return resolved;
177 }
178
179 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
180 // This method is used from java.lang.invoke.MemberName constructors.
181 // It fills in the new MemberName from a java.lang.reflect.Member.
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, THREAD);
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, THREAD);
220 }
221 }
222 return NULL;
223 }
224
225 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info, TRAPS) {
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 InstanceKlass* ik = fd.field_holder();
343 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
344 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
345 if (fd.is_trusted_final()) flags |= TRUSTED_FINAL;
346 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
347 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
348
349 oop mname_oop = mname();
350 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
351 java_lang_invoke_MemberName::set_method (mname_oop, NULL);
352 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
353 java_lang_invoke_MemberName::set_clazz (mname_oop, ik->java_mirror());
354
355 oop type = field_signature_type_or_null(fd.signature());
356 oop name = field_name_or_null(fd.name());
357 if (name != NULL)
358 java_lang_invoke_MemberName::set_name(mname_oop, name);
359 if (type != NULL)
360 java_lang_invoke_MemberName::set_type(mname_oop, type);
361 // Note: name and type can be lazily computed by resolve_MemberName,
362 // if Java code needs them as resolved String and Class objects.
363 // Note that the incoming type oop might be pre-resolved (non-null).
364 // The base clazz and field offset (vmindex) must be eagerly stored,
365 // because they unambiguously identify the field.
366 // Although the fieldDescriptor::_index would also identify the field,
367 // we do not use it, because it is harder to decode.
368 // TO DO: maybe intern mname_oop
369 return mname();
370 }
371
372 // JVM 2.9 Special Methods:
373 // A method is signature polymorphic if and only if all of the following conditions hold :
374 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
375 // * It has a single formal parameter of type Object[].
376 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
377 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
378 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
379 if (klass == NULL)
380 return false;
381 // The following test will fail spuriously during bootstrap of MethodHandle itself:
382 // if (klass != SystemDictionary::MethodHandle_klass())
383 // Test the name instead:
384 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
385 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
386 return false;
387 }
388
389 // Look up signature polymorphic method with polymorphic return type
390 Symbol* poly_sig = vmSymbols::object_array_object_signature();
391 InstanceKlass* iklass = InstanceKlass::cast(klass);
392 Method* m = iklass->find_method(name, poly_sig);
393 if (m != NULL) {
394 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
395 int flags = m->access_flags().as_int();
396 if ((flags & required) == required) {
397 return true;
398 }
399 }
400
401 // Look up signature polymorphic method with non-polymorphic (non Object) return type
402 int me;
403 int ms = iklass->find_method_by_name(name, &me);
404 if (ms == -1) return false;
405 for (; ms < me; ms++) {
406 Method* m = iklass->methods()->at(ms);
407 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
408 int flags = m->access_flags().as_int();
409 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
410 return true;
411 }
412 }
413 return false;
414 }
415
416
417 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
418 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
419 switch (iid) {
420 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
421 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
422 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
423 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
424 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
425 default:
426 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
427 return 0;
428 }
429 }
430
431 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
432 switch(id) {
433 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
434 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
435 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
436 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
437 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
438 default:
439 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
440 return Bytecodes::_illegal;
441 }
442 }
443
444 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
445 switch (iid) {
446 case vmIntrinsics::_invokeBasic: return 0;
447 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
448 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
449 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
450 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
451 default:
452 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
453 return 0;
454 }
455 }
456
457 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
458 vmSymbols::SID name_id = vmSymbols::find_sid(name);
459 switch (name_id) {
460 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
461 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
462 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
463 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
464
465 // There is one static signature-polymorphic method for each JVM invocation mode.
466 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
467 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
468 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
469 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
470 default: break;
471 }
472
473 // Cover the case of invokeExact and any future variants of invokeFoo.
474 Klass* mh_klass = SystemDictionary::well_known_klass(
475 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
476 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
477 return vmIntrinsics::_invokeGeneric;
478 }
479
480 // Cover the case of methods on VarHandle.
481 Klass* vh_klass = SystemDictionary::well_known_klass(
482 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) );
483 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
484 return vmIntrinsics::_invokeGeneric;
485 }
486
487 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
488 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
489 return vmIntrinsics::_none;
490 }
491
492 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
493 if (klass != NULL &&
494 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
495 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
496 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
497 if (iid != vmIntrinsics::_none)
498 return iid;
499 if (is_method_handle_invoke_name(klass, name))
500 return vmIntrinsics::_invokeGeneric;
501 }
502 return vmIntrinsics::_none;
503 }
504
505 // Returns true if method is signature polymorphic and public
506 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
507 if (is_signature_polymorphic_name(klass, name)) {
508 InstanceKlass* iklass = InstanceKlass::cast(klass);
509 int me;
510 int ms = iklass->find_method_by_name(name, &me);
511 assert(ms != -1, "");
512 for (; ms < me; ms++) {
513 Method* m = iklass->methods()->at(ms);
514 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
515 int flags = m->access_flags().as_int();
516 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
517 return true;
518 }
519 }
520 }
521 return false;
522 }
523
524 // convert the external string or reflective type to an internal signature
525 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
526 if (java_lang_invoke_MethodType::is_instance(type_str)) {
527 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
528 } else if (java_lang_Class::is_instance(type_str)) {
529 return java_lang_Class::as_signature(type_str, false);
530 } else if (java_lang_String::is_instance_inlined(type_str)) {
531 if (intern_if_not_found) {
532 return java_lang_String::as_symbol(type_str);
533 } else {
534 return java_lang_String::as_symbol_or_null(type_str);
535 }
536 } else {
537 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
538 }
539 }
540
541 static const char OBJ_SIG[] = "Ljava/lang/Object;";
542 enum { OBJ_SIG_LEN = 18 };
543
544 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
545 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
546 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
547 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) {
548 switch (ss.type()) {
549 case T_OBJECT:
550 // only java/lang/Object is valid here
551 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, OBJ_SIG_LEN) != 0)
552 return false;
553 break;
554 case T_VOID:
555 case T_INT:
556 case T_LONG:
557 case T_FLOAT:
558 case T_DOUBLE:
559 break;
560 default:
561 // subword types (T_BYTE etc.), Q-descriptors, arrays
562 return false;
563 }
564 }
565 return true;
566 }
567
568 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
569 Symbol* bsig = NULL;
570 if (sig == NULL) {
571 return sig;
572 } else if (is_basic_type_signature(sig)) {
573 sig->increment_refcount();
574 return sig; // that was easy
575 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) {
576 BasicType bt = Signature::basic_type(sig);
577 if (is_subword_type(bt)) {
578 bsig = vmSymbols::int_signature();
579 } else {
580 assert(is_reference_type(bt), "is_basic_type_signature was false");
581 bsig = vmSymbols::object_signature();
582 }
583 } else {
584 ResourceMark rm;
585 stringStream buffer(128);
586 buffer.put(JVM_SIGNATURE_FUNC);
587 int arg_pos = 0, keep_arg_pos = -1;
588 if (keep_last_arg)
589 keep_arg_pos = ArgumentCount(sig).size() - 1;
590 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
591 BasicType bt = ss.type();
592 size_t this_arg_pos = buffer.size();
593 if (ss.at_return_type()) {
594 buffer.put(JVM_SIGNATURE_ENDFUNC);
595 }
596 if (arg_pos == keep_arg_pos) {
597 buffer.write((char*) ss.raw_bytes(),
598 (int) ss.raw_length());
599 } else if (is_reference_type(bt)) {
600 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
601 } else {
602 if (is_subword_type(bt))
603 bt = T_INT;
604 buffer.put(type2char(bt));
605 }
606 arg_pos++;
607 }
608 const char* sigstr = buffer.base();
609 int siglen = (int) buffer.size();
610 bsig = SymbolTable::new_symbol(sigstr, siglen);
611 }
612 assert(is_basic_type_signature(bsig) ||
613 // detune assert in case the injected argument is not a basic type:
614 keep_last_arg, "");
615 return bsig;
616 }
617
618 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
619 Symbol* sig) {
620 st = st ? st : tty;
621 bool prev_type = false;
622 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC);
623 if (is_method) st->put(JVM_SIGNATURE_FUNC);
624 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
625 if (ss.at_return_type())
626 st->put(JVM_SIGNATURE_ENDFUNC);
627 else if (prev_type)
628 st->put(',');
629 const char* cp = (const char*) ss.raw_bytes();
630 if (ss.is_array()) {
631 st->put(JVM_SIGNATURE_ARRAY);
632 if (ss.array_prefix_length() == 1)
633 st->put(cp[1]);
634 else
635 st->put(JVM_SIGNATURE_CLASS);
636 } else {
637 st->put(cp[0]);
638 }
639 }
640 }
641
642
643
644 static oop object_java_mirror() {
645 return SystemDictionary::Object_klass()->java_mirror();
646 }
647
648 oop MethodHandles::field_name_or_null(Symbol* s) {
649 if (s == NULL) return NULL;
650 return StringTable::lookup(s);
651 }
652
653 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
654 if (s == NULL) return NULL;
655 BasicType bt = Signature::basic_type(s);
656 if (is_java_primitive(bt)) {
657 assert(s->utf8_length() == 1, "");
658 return java_lang_Class::primitive_mirror(bt);
659 }
660 // Here are some more short cuts for common types.
661 // They are optional, since reference types can be resolved lazily.
662 if (bt == T_OBJECT) {
663 if (s == vmSymbols::object_signature()) {
664 return object_java_mirror();
665 } else if (s == vmSymbols::class_signature()) {
666 return SystemDictionary::Class_klass()->java_mirror();
667 } else if (s == vmSymbols::string_signature()) {
668 return SystemDictionary::String_klass()->java_mirror();
669 }
670 }
671 return NULL;
672 }
673
674
675 // An unresolved member name is a mere symbolic reference.
676 // Resolving it plants a vmtarget/vmindex in it,
677 // which refers directly to JVM internals.
678 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller,
679 bool speculative_resolve, TRAPS) {
680 Handle empty;
681 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
682
683 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
684 // Already resolved.
685 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
686 assert(vmindex >= Method::nonvirtual_vtable_index, "");
687 return mname;
688 }
689
690 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
691 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
692 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
693 int flags = java_lang_invoke_MemberName::flags(mname());
694 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
695 if (!ref_kind_is_valid(ref_kind)) {
696 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
697 }
698
699 DEBUG_ONLY(int old_vmindex);
700 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
701
702 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
703 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
704 }
705
706 InstanceKlass* defc = NULL;
707 {
708 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
709 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
710 if (!defc_klass->is_instance_klass()) {
711 if (!defc_klass->is_array_klass()) return empty;
712 defc_klass = SystemDictionary::Object_klass();
713 }
714 defc = InstanceKlass::cast(defc_klass);
715 }
716 if (defc == NULL) {
717 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
718 }
719 defc->link_class(CHECK_(empty)); // possible safepoint
720
721 // convert the external string name to an internal symbol
722 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
723 if (name == NULL) return empty; // no such name
724 if (name == vmSymbols::class_initializer_name())
725 return empty; // illegal name
726
727 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
728 if ((flags & ALL_KINDS) == IS_METHOD &&
729 (defc == SystemDictionary::MethodHandle_klass() || defc == SystemDictionary::VarHandle_klass()) &&
730 (ref_kind == JVM_REF_invokeVirtual ||
731 ref_kind == JVM_REF_invokeSpecial ||
732 // static invocation mode is required for _linkToVirtual, etc.:
733 ref_kind == JVM_REF_invokeStatic)) {
734 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
735 if (iid != vmIntrinsics::_none &&
736 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
737 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
738 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
739 mh_invoke_id = iid;
740 }
741 }
742
743 // convert the external string or reflective type to an internal signature
744 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
745 if (type == NULL) return empty; // no such signature exists in the VM
746
747 LinkInfo::AccessCheck access_check = caller != NULL ?
748 LinkInfo::needs_access_check :
749 LinkInfo::skip_access_check;
750
751 // Time to do the lookup.
752 switch (flags & ALL_KINDS) {
753 case IS_METHOD:
754 {
755 CallInfo result;
756 LinkInfo link_info(defc, name, type, caller, access_check);
757 {
758 assert(!HAS_PENDING_EXCEPTION, "");
759 if (ref_kind == JVM_REF_invokeStatic) {
760 LinkResolver::resolve_static_call(result,
761 link_info, false, THREAD);
762 } else if (ref_kind == JVM_REF_invokeInterface) {
763 LinkResolver::resolve_interface_call(result, Handle(), defc,
764 link_info, false, THREAD);
765 } else if (mh_invoke_id != vmIntrinsics::_none) {
766 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
767 LinkResolver::resolve_handle_call(result, link_info, THREAD);
768 } else if (ref_kind == JVM_REF_invokeSpecial) {
769 LinkResolver::resolve_special_call(result, Handle(),
770 link_info, THREAD);
771 } else if (ref_kind == JVM_REF_invokeVirtual) {
772 LinkResolver::resolve_virtual_call(result, Handle(), defc,
773 link_info, false, THREAD);
774 } else {
775 assert(false, "ref_kind=%d", ref_kind);
776 }
777 if (HAS_PENDING_EXCEPTION) {
778 if (speculative_resolve) {
779 CLEAR_PENDING_EXCEPTION;
780 }
781 return empty;
782 }
783 }
784 if (result.resolved_appendix().not_null()) {
785 // The resolved MemberName must not be accompanied by an appendix argument,
786 // since there is no way to bind this value into the MemberName.
787 // Caller is responsible to prevent this from happening.
788 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
789 }
790 result.set_resolved_method_name(CHECK_(empty));
791 oop mname2 = init_method_MemberName(mname, result, THREAD);
792 return Handle(THREAD, mname2);
793 }
794 case IS_CONSTRUCTOR:
795 {
796 CallInfo result;
797 LinkInfo link_info(defc, name, type, caller, access_check);
798 {
799 assert(!HAS_PENDING_EXCEPTION, "");
800 if (name == vmSymbols::object_initializer_name()) {
801 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
802 } else {
803 break; // will throw after end of switch
804 }
805 if (HAS_PENDING_EXCEPTION) {
806 if (speculative_resolve) {
807 CLEAR_PENDING_EXCEPTION;
808 }
809 return empty;
810 }
811 }
812 assert(result.is_statically_bound(), "");
813 result.set_resolved_method_name(CHECK_(empty));
814 oop mname2 = init_method_MemberName(mname, result, THREAD);
815 return Handle(THREAD, mname2);
816 }
817 case IS_FIELD:
818 {
819 fieldDescriptor result; // find_field initializes fd if found
820 {
821 assert(!HAS_PENDING_EXCEPTION, "");
822 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
823 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
824 if (HAS_PENDING_EXCEPTION) {
825 if (speculative_resolve) {
826 CLEAR_PENDING_EXCEPTION;
827 }
828 return empty;
829 }
830 }
831 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
832 return Handle(THREAD, mname2);
833 }
834 default:
835 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
836 }
837
838 return empty;
839 }
840
841 // Conversely, a member name which is only initialized from JVM internals
842 // may have null defc, name, and type fields.
843 // Resolving it plants a vmtarget/vmindex in it,
844 // which refers directly to JVM internals.
845 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
846 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
847
848 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
849 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
850 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
851 int flags = java_lang_invoke_MemberName::flags(mname());
852
853 if (suppress != 0) {
854 if (suppress & _suppress_defc) have_defc = true;
855 if (suppress & _suppress_name) have_name = true;
856 if (suppress & _suppress_type) have_type = true;
857 }
858
859 if (have_defc && have_name && have_type) return; // nothing needed
860
861 switch (flags & ALL_KINDS) {
862 case IS_METHOD:
863 case IS_CONSTRUCTOR:
864 {
865 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
866 if (vmtarget == NULL) {
867 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
868 }
869 methodHandle m(THREAD, vmtarget);
870 DEBUG_ONLY(vmtarget = NULL); // safety
871 if (!have_defc) {
872 InstanceKlass* defc = m->method_holder();
873 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
874 }
875 if (!have_name) {
876 //not java_lang_String::create_from_symbol; let's intern member names
877 oop name = StringTable::intern(m->name(), CHECK);
878 java_lang_invoke_MemberName::set_name(mname(), name);
879 }
880 if (!have_type) {
881 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
882 java_lang_invoke_MemberName::set_type(mname(), type());
883 }
884 return;
885 }
886 case IS_FIELD:
887 {
888 oop clazz = java_lang_invoke_MemberName::clazz(mname());
889 if (clazz == NULL) {
890 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
891 }
892 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
893 DEBUG_ONLY(clazz = NULL); // safety
894 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
895 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
896 fieldDescriptor fd; // find_field initializes fd if found
897 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
898 break; // cannot expand
899 if (!have_name) {
900 //not java_lang_String::create_from_symbol; let's intern member names
901 oop name = StringTable::intern(fd.name(), CHECK);
902 java_lang_invoke_MemberName::set_name(mname(), name);
903 }
904 if (!have_type) {
905 // If it is a primitive field type, don't mess with short strings like "I".
906 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
907 if (type.is_null()) {
908 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
909 }
910 java_lang_invoke_MemberName::set_type(mname(), type());
911 }
912 return;
913 }
914 }
915 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
916 }
917
918 int MethodHandles::find_MemberNames(Klass* k,
919 Symbol* name, Symbol* sig,
920 int mflags, Klass* caller,
921 int skip, objArrayHandle results, TRAPS) {
922 // %%% take caller into account!
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, THREAD);
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_TRUSTED_FINAL) \
1111 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1112 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1113 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1114 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1115 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \
1116 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \
1117 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \
1118 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \
1119 /*end*/
1120
1121 #define IGNORE_REQ(req_expr) /* req_expr */
1122 #define ONE_PLUS(scope,value) 1+
1123 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1124 #define VALUE_COMMA(scope,value) scope::value,
1125 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1126 #define STRING_NULL(scope,value) #value "\0"
1127 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1128
1129 static bool advertise_con_value(int which) {
1130 if (which < 0) return false;
1131 bool ok = true;
1132 int count = 0;
1133 #define INC_COUNT(scope,value) \
1134 ++count;
1135 #define CHECK_REQ(req_expr) \
1136 if (which < count) return ok; \
1137 ok = (req_expr);
1138 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1139 #undef INC_COUNT
1140 #undef CHECK_REQ
1141 assert(count == con_value_count, "");
1142 if (which < count) return ok;
1143 return false;
1144 }
1145
1146 #undef ONE_PLUS
1147 #undef VALUE_COMMA
1148 #undef STRING_NULL
1149 #undef EACH_NAMED_CON
1150 #endif // PRODUCT
1151
1152 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1153 #ifndef PRODUCT
1154 if (advertise_con_value(which)) {
1155 assert(which >= 0 && which < con_value_count, "");
1156 int con = con_values[which];
1157 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1158 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1159 const char* str = &con_names[0];
1160 for (int i = 0; i < which; i++)
1161 str += strlen(str) + 1; // skip name and null
1162 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1163 box->obj_at_put(0, name);
1164 }
1165 return con;
1166 }
1167 #endif
1168 return 0;
1169 }
1170 JVM_END
1171
1172 // void init(MemberName self, AccessibleObject ref)
1173 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1174 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1175 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1176 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1177 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1178 MethodHandles::init_MemberName(mname, target, CHECK);
1179 }
1180 JVM_END
1181
1182 // void expand(MemberName self)
1183 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1184 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1185 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1186 MethodHandles::expand_MemberName(mname, 0, CHECK);
1187 }
1188 JVM_END
1189
1190 // void resolve(MemberName self, Class<?> caller)
1191 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1192 jboolean speculative_resolve)) {
1193 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1194 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1195
1196 // The trusted Java code that calls this method should already have performed
1197 // access checks on behalf of the given caller. But, we can verify this.
1198 if (VerifyMethodHandles && caller_jh != NULL &&
1199 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1200 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1201 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1202 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1203 }
1204
1205 // Reflection::verify_class_access can only handle instance classes.
1206 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1207 // Emulate LinkResolver::check_klass_accessability.
1208 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1209 if (caller != SystemDictionary::Object_klass()
1210 && Reflection::verify_class_access(caller,
1211 InstanceKlass::cast(reference_klass),
1212 true) != Reflection::ACCESS_OK) {
1213 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1214 }
1215 }
1216 }
1217
1218 Klass* caller = caller_jh == NULL ? NULL :
1219 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1220 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, speculative_resolve == JNI_TRUE,
1221 CHECK_NULL);
1222
1223 if (resolved.is_null()) {
1224 int flags = java_lang_invoke_MemberName::flags(mname());
1225 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1226 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1227 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1228 }
1229 if (speculative_resolve) {
1230 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1231 return NULL;
1232 }
1233 if ((flags & ALL_KINDS) == IS_FIELD) {
1234 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1235 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1236 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1237 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1238 } else {
1239 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1240 }
1241 }
1242
1243 return JNIHandles::make_local(THREAD, resolved());
1244 }
1245 JVM_END
1246
1247 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1248 if (mname == NULL ||
1249 java_lang_invoke_MemberName::clazz(mname) == NULL) {
1250 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1251 } else {
1252 int flags = java_lang_invoke_MemberName::flags(mname);
1253 if ((flags & IS_FIELD) != 0 &&
1254 (must_be_static
1255 ? (flags & JVM_ACC_STATIC) != 0
1256 : (flags & JVM_ACC_STATIC) == 0)) {
1257 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1258 return (jlong) vmindex;
1259 }
1260 }
1261 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1262 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1263 return 0;
1264 }
1265
1266 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1267 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1268 }
1269 JVM_END
1270
1271 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1272 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1273 }
1274 JVM_END
1275
1276 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1277 // use the other function to perform sanity checks:
1278 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1279 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1280 return JNIHandles::make_local(THREAD, clazz);
1281 }
1282 JVM_END
1283
1284 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1285 if (mname_jh == NULL) return NULL;
1286 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1287 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1288 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1289 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1290 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1291 result->obj_at_put(0, x);
1292
1293 int flags = java_lang_invoke_MemberName::flags(mname());
1294 if ((flags & IS_FIELD) != 0) {
1295 x = java_lang_invoke_MemberName::clazz(mname());
1296 } else {
1297 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1298 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1299 x = mname();
1300 }
1301 result->obj_at_put(1, x);
1302 return JNIHandles::make_local(THREAD, result());
1303 }
1304 JVM_END
1305
1306
1307
1308 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1309 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1310 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1311 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1312 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1313 if (clazz_jh == NULL || results_jh == NULL) return -1;
1314 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1315
1316 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1317 if (results.is_null() || !results->is_objArray()) return -1;
1318
1319 TempNewSymbol name = NULL;
1320 TempNewSymbol sig = NULL;
1321 if (name_jh != NULL) {
1322 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1323 if (name == NULL) return 0; // a match is not possible
1324 }
1325 if (sig_jh != NULL) {
1326 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1327 if (sig == NULL) return 0; // a match is not possible
1328 }
1329
1330 Klass* caller = NULL;
1331 if (caller_jh != NULL) {
1332 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1333 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1334 caller = java_lang_Class::as_Klass(caller_oop);
1335 }
1336
1337 if (name != NULL && sig != NULL && results.not_null()) {
1338 // try a direct resolve
1339 // %%% TO DO
1340 }
1341
1342 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1343 caller, skip, results, CHECK_0);
1344 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1345 return res;
1346 }
1347 JVM_END
1348
1349 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1350 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1351 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1352 {
1353 // Walk all nmethods depending on this call site.
1354 MutexLocker mu(thread, Compile_lock);
1355 MethodHandles::flush_dependent_nmethods(call_site, target);
1356 java_lang_invoke_CallSite::set_target(call_site(), target());
1357 }
1358 }
1359 JVM_END
1360
1361 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1362 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1363 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1364 {
1365 // Walk all nmethods depending on this call site.
1366 MutexLocker mu(thread, Compile_lock);
1367 MethodHandles::flush_dependent_nmethods(call_site, target);
1368 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1369 }
1370 }
1371 JVM_END
1372
1373 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1374 jobject caller_jh, jintArray index_info_jh,
1375 jint start, jint end,
1376 jobjectArray buf_jh, jint pos,
1377 jboolean resolve, jobject ifna_jh)) {
1378 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1379 if (caller_k == NULL || !caller_k->is_instance_klass()) {
1380 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1381 }
1382 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1383 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1384 if (index_info_oop == NULL ||
1385 index_info_oop->klass() != Universe::intArrayKlassObj() ||
1386 typeArrayOop(index_info_oop)->length() < 2) {
1387 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1388 }
1389 typeArrayHandle index_info(THREAD, index_info_oop);
1390 int bss_index_in_pool = index_info->int_at(1);
1391 // While we are here, take a quick look at the index info:
1392 if (bss_index_in_pool <= 0 ||
1393 bss_index_in_pool >= caller->constants()->length() ||
1394 index_info->int_at(0)
1395 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1396 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1397 }
1398 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1399 if (start < 0) {
1400 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1401 if (start == pseudo_index) {
1402 if (start >= end || 0 > pos || pos >= buf->length()) break;
1403 oop pseudo_arg = NULL;
1404 switch (pseudo_index) {
1405 case -4: // bootstrap method
1406 {
1407 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool);
1408 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1409 break;
1410 }
1411 case -3: // name
1412 {
1413 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool);
1414 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1415 pseudo_arg = str();
1416 break;
1417 }
1418 case -2: // type
1419 {
1420 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool);
1421 Handle th;
1422 if (type->char_at(0) == JVM_SIGNATURE_FUNC) {
1423 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1424 } else {
1425 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1426 }
1427 pseudo_arg = th();
1428 break;
1429 }
1430 case -1: // argument count
1431 {
1432 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool);
1433 jvalue argc_value; argc_value.i = (jint)argc;
1434 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1435 break;
1436 }
1437 }
1438
1439 // Store the pseudo-argument, and advance the pointers.
1440 buf->obj_at_put(pos++, pseudo_arg);
1441 ++start;
1442 }
1443 }
1444 // When we are done with this there may be regular arguments to process too.
1445 }
1446 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1447 caller->constants()->
1448 copy_bootstrap_arguments_at(bss_index_in_pool,
1449 start, end, buf, pos,
1450 (resolve == JNI_TRUE), ifna, CHECK);
1451 }
1452 JVM_END
1453
1454 // It is called by a Cleaner object which ensures that dropped CallSites properly
1455 // deallocate their dependency information.
1456 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1457 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1458 {
1459 // Walk all nmethods depending on this call site.
1460 MutexLocker mu1(thread, Compile_lock);
1461
1462 int marked = 0;
1463 {
1464 NoSafepointVerifier nsv;
1465 MutexLocker mu2(THREAD, CodeCache_lock, Mutex::_no_safepoint_check_flag);
1466 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1467 marked = deps.remove_all_dependents();
1468 }
1469 if (marked > 0) {
1470 // At least one nmethod has been marked for deoptimization
1471 Deoptimization::deoptimize_all_marked();
1472 }
1473 }
1474 }
1475 JVM_END
1476
1477 /**
1478 * Throws a java/lang/UnsupportedOperationException unconditionally.
1479 * This is required by the specification of MethodHandle.invoke if
1480 * invoked directly.
1481 */
1482 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1483 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1484 return NULL;
1485 }
1486 JVM_END
1487
1488 /**
1489 * Throws a java/lang/UnsupportedOperationException unconditionally.
1490 * This is required by the specification of MethodHandle.invokeExact if
1491 * invoked directly.
1492 */
1493 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1494 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1495 return NULL;
1496 }
1497 JVM_END
1498
1499 /// JVM_RegisterMethodHandleMethods
1500
1501 #define LANG "Ljava/lang/"
1502 #define JLINV "Ljava/lang/invoke/"
1503
1504 #define OBJ LANG "Object;"
1505 #define CLS LANG "Class;"
1506 #define STRG LANG "String;"
1507 #define CS JLINV "CallSite;"
1508 #define MT JLINV "MethodType;"
1509 #define MH JLINV "MethodHandle;"
1510 #define MEM JLINV "MemberName;"
1511 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1512
1513 #define CC (char*) /*cast a literal from (const char*)*/
1514 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1515
1516 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1517 static JNINativeMethod MHN_methods[] = {
1518 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1519 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1520 {CC "resolve", CC "(" MEM "" CLS "Z)" MEM, FN_PTR(MHN_resolve_Mem)},
1521 // static native int getNamedCon(int which, Object[] name)
1522 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1523 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1524 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1525 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1526 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1527 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1528 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1529 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1530 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1531 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1532 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1533 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1534 };
1535
1536 static JNINativeMethod MH_methods[] = {
1537 // UnsupportedOperationException throwers
1538 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1539 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1540 };
1541
1542 /**
1543 * This one function is exported, used by NativeLookup.
1544 */
1545 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1546 assert(!MethodHandles::enabled(), "must not be enabled");
1547 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1548
1549 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1550 jclass MH_class = (jclass) JNIHandles::make_local(THREAD, mirror);
1551
1552 {
1553 ThreadToNativeFromVM ttnfv(thread);
1554
1555 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1556 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1557 "register java.lang.invoke.MethodHandleNative natives");
1558
1559 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1560 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1561 "register java.lang.invoke.MethodHandle natives");
1562 }
1563
1564 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1565
1566 MethodHandles::set_enabled(true);
1567 }
1568 JVM_END