1 /*
2 * Copyright (c) 2008, 2018, 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 "code/codeCache.hpp"
29 #include "code/dependencyContext.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "interpreter/oopMapCache.hpp"
33 #include "interpreter/linkResolver.hpp"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "oops/objArrayOop.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "oops/typeArrayOop.inline.hpp"
40 #include "prims/methodHandles.hpp"
41 #include "runtime/compilationPolicy.hpp"
42 #include "runtime/interfaceSupport.inline.hpp"
43 #include "runtime/javaCalls.hpp"
44 #include "runtime/jniHandles.inline.hpp"
45 #include "runtime/timerTrace.hpp"
46 #include "runtime/reflection.hpp"
47 #include "runtime/safepointVerifiers.hpp"
48 #include "runtime/signature.hpp"
49 #include "runtime/stubRoutines.hpp"
50 #include "utilities/exceptions.hpp"
51
52
53 /*
54 * JSR 292 reference implementation: method handles
55 * The JDK 7 reference implementation represented method handle
56 * combinations as chains. Each link in the chain had a "vmentry"
57 * field which pointed at a bit of assembly code which performed
58 * one transformation before dispatching to the next link in the chain.
59 *
60 * The current reference implementation pushes almost all code generation
61 * responsibility to (trusted) Java code. A method handle contains a
62 * pointer to its "LambdaForm", which embodies all details of the method
63 * handle's behavior. The LambdaForm is a normal Java object, managed
64 * by a runtime coded in Java.
65 */
66
67 bool MethodHandles::_enabled = false; // set true after successful native linkage
68 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
69
70 /**
71 * Generates method handle adapters. Returns 'false' if memory allocation
72 * failed and true otherwise.
73 */
74 void MethodHandles::generate_adapters() {
75 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
76 assert(_adapter_code == NULL, "generate only once");
77
78 ResourceMark rm;
79 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
80 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
81 CodeBuffer code(_adapter_code);
82 MethodHandlesAdapterGenerator g(&code);
83 g.generate();
84 code.log_section_sizes("MethodHandlesAdapterBlob");
85 }
86
87 //------------------------------------------------------------------------------
88 // MethodHandlesAdapterGenerator::generate
89 //
90 void MethodHandlesAdapterGenerator::generate() {
91 // Generate generic method handle adapters.
92 // Generate interpreter entries
93 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
94 mk <= Interpreter::method_handle_invoke_LAST;
95 mk = Interpreter::MethodKind(1 + (int)mk)) {
96 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
97 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
98 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
99 if (entry != NULL) {
100 Interpreter::set_entry_for_kind(mk, entry);
101 }
102 // If the entry is not set, it will throw AbstractMethodError.
103 }
104 }
105
106 void MethodHandles::set_enabled(bool z) {
107 if (_enabled != z) {
108 guarantee(z, "can only enable once");
109 _enabled = z;
110 }
111 }
112
113 // MemberName support
114
115 // import java_lang_invoke_MemberName.*
116 enum {
117 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
118 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
119 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
120 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
121 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
122 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
123 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
124 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
125 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
126 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
127 };
128
129 int MethodHandles::ref_kind_to_flags(int ref_kind) {
130 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
131 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
132 if (ref_kind_is_field(ref_kind)) {
133 flags |= IS_FIELD;
134 } else if (ref_kind_is_method(ref_kind)) {
135 flags |= IS_METHOD;
136 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
137 flags |= IS_CONSTRUCTOR;
138 }
139 return flags;
140 }
141
142 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
143 Handle empty;
144 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
145 if (!java_lang_String::is_instance_inlined(type())) {
146 return type; // already resolved
147 }
148 Symbol* signature = java_lang_String::as_symbol_or_null(type());
149 if (signature == NULL) {
150 return empty; // no such signature exists in the VM
151 }
152 Handle resolved;
153 int flags = java_lang_invoke_MemberName::flags(mname());
154 switch (flags & ALL_KINDS) {
155 case IS_METHOD:
156 case IS_CONSTRUCTOR:
157 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
158 break;
159 case IS_FIELD:
160 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
161 break;
162 default:
163 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
164 }
165 if (resolved.is_null()) {
166 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
167 }
168 return resolved;
169 }
170
171 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
172 // This method is used from java.lang.invoke.MemberName constructors.
173 // It fills in the new MemberName from a java.lang.reflect.Member.
174 Thread* thread = Thread::current();
175 oop target_oop = target();
176 Klass* target_klass = target_oop->klass();
177 if (target_klass == SystemDictionary::reflect_Field_klass()) {
178 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
179 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
180 Klass* k = java_lang_Class::as_Klass(clazz);
181 if (k != NULL && k->is_instance_klass()) {
182 fieldDescriptor fd(InstanceKlass::cast(k), slot);
183 oop mname2 = init_field_MemberName(mname, fd);
184 if (mname2 != NULL) {
185 // Since we have the reified name and type handy, add them to the result.
186 if (java_lang_invoke_MemberName::name(mname2) == NULL)
187 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
188 if (java_lang_invoke_MemberName::type(mname2) == NULL)
189 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
190 }
191 return mname2;
192 }
193 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
194 oop clazz = java_lang_reflect_Method::clazz(target_oop);
195 int slot = java_lang_reflect_Method::slot(target_oop);
196 Klass* k = java_lang_Class::as_Klass(clazz);
197 if (k != NULL && k->is_instance_klass()) {
198 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
199 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
200 return NULL; // do not resolve unless there is a concrete signature
201 CallInfo info(m, k, CHECK_NULL);
202 return init_method_MemberName(mname, info);
203 }
204 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
205 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
206 int slot = java_lang_reflect_Constructor::slot(target_oop);
207 Klass* k = java_lang_Class::as_Klass(clazz);
208 if (k != NULL && k->is_instance_klass()) {
209 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
210 if (m == NULL) return NULL;
211 CallInfo info(m, k, CHECK_NULL);
212 return init_method_MemberName(mname, info);
213 }
214 }
215 return NULL;
216 }
217
218 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
219 assert(info.resolved_appendix().is_null(), "only normal methods here");
220 methodHandle m = info.resolved_method();
221 assert(m.not_null(), "null method handle");
222 InstanceKlass* m_klass = m->method_holder();
223 assert(m_klass != NULL, "null holder for method handle");
224 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
225 int vmindex = Method::invalid_vtable_index;
226
227 switch (info.call_kind()) {
228 case CallInfo::itable_call:
229 vmindex = info.itable_index();
230 // More importantly, the itable index only works with the method holder.
231 assert(m_klass->verify_itable_index(vmindex), "");
232 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
233 if (TraceInvokeDynamic) {
234 ttyLocker ttyl;
235 ResourceMark rm;
236 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
237 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
238 vmindex);
239 m->access_flags().print_on(tty);
240 if (!m->is_abstract()) {
241 if (!m->is_private()) {
242 tty->print("default");
243 }
244 else {
245 tty->print("private-intf");
246 }
247 }
248 tty->cr();
249 }
250 break;
251
252 case CallInfo::vtable_call:
253 vmindex = info.vtable_index();
254 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
255 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
256 if (m_klass->is_interface()) {
257 // This is a vtable call to an interface method (abstract "miranda method" or default method).
258 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
259 // (LinkResolver should help us figure this out.)
260 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass");
261 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass());
262 if (m_klass_non_interface->is_interface()) {
263 m_klass_non_interface = SystemDictionary::Object_klass();
264 #ifdef ASSERT
265 { ResourceMark rm;
266 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
267 assert(m->name() == m2->name() && m->signature() == m2->signature(),
268 "at %d, %s != %s", vmindex,
269 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
270 }
271 #endif //ASSERT
272 }
273 if (!m->is_public()) {
274 assert(m->is_public(), "virtual call must be to public interface method");
275 return NULL; // elicit an error later in product build
276 }
277 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
278 m_klass = m_klass_non_interface;
279 }
280 if (TraceInvokeDynamic) {
281 ttyLocker ttyl;
282 ResourceMark rm;
283 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
284 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
285 m_klass->internal_name(), vmindex);
286 m->access_flags().print_on(tty);
287 if (m->is_default_method()) {
288 tty->print("default");
289 }
290 tty->cr();
291 }
292 break;
293
294 case CallInfo::direct_call:
295 vmindex = Method::nonvirtual_vtable_index;
296 if (m->is_static()) {
297 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
298 } else if (m->is_initializer()) {
299 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
300 } else {
301 // "special" reflects that this is a direct call, not that it
302 // necessarily originates from an invokespecial. We can also do
303 // direct calls for private and/or final non-static methods.
304 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
305 }
306 break;
307
308 default: assert(false, "bad CallInfo"); return NULL;
309 }
310
311 // @CallerSensitive annotation detected
312 if (m->caller_sensitive()) {
313 flags |= CALLER_SENSITIVE;
314 }
315
316 Handle resolved_method = info.resolved_method_name();
317 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m(),
318 "Should not change after link resolution");
319
320 oop mname_oop = mname();
321 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
322 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
323 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
324 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
325 // Note: name and type can be lazily computed by resolve_MemberName,
326 // if Java code needs them as resolved String and MethodType objects.
327 // If relevant, the vtable or itable value is stored as vmindex.
328 // This is done eagerly, since it is readily available without
329 // constructing any new objects.
330 return mname();
331 }
332
333 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
334 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
335 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
336 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
337 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
338
339 oop mname_oop = mname();
340 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
341 java_lang_invoke_MemberName::set_method (mname_oop, NULL);
342 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
343 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror());
344
345 oop type = field_signature_type_or_null(fd.signature());
346 oop name = field_name_or_null(fd.name());
347 if (name != NULL)
348 java_lang_invoke_MemberName::set_name(mname_oop, name);
349 if (type != NULL)
350 java_lang_invoke_MemberName::set_type(mname_oop, type);
351 // Note: name and type can be lazily computed by resolve_MemberName,
352 // if Java code needs them as resolved String and Class objects.
353 // Note that the incoming type oop might be pre-resolved (non-null).
354 // The base clazz and field offset (vmindex) must be eagerly stored,
355 // because they unambiguously identify the field.
356 // Although the fieldDescriptor::_index would also identify the field,
357 // we do not use it, because it is harder to decode.
358 // TO DO: maybe intern mname_oop
359 return mname();
360 }
361
362 // JVM 2.9 Special Methods:
363 // A method is signature polymorphic if and only if all of the following conditions hold :
364 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
365 // * It has a single formal parameter of type Object[].
366 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
367 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
368 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
369 if (klass == NULL)
370 return false;
371 // The following test will fail spuriously during bootstrap of MethodHandle itself:
372 // if (klass != SystemDictionary::MethodHandle_klass())
373 // Test the name instead:
374 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
375 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
376 return false;
377 }
378
379 // Look up signature polymorphic method with polymorphic return type
380 Symbol* poly_sig = vmSymbols::object_array_object_signature();
381 InstanceKlass* iklass = InstanceKlass::cast(klass);
382 Method* m = iklass->find_method(name, poly_sig);
383 if (m != NULL) {
384 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
385 int flags = m->access_flags().as_int();
386 if ((flags & required) == required) {
387 return true;
388 }
389 }
390
391 // Look up signature polymorphic method with non-polymorphic (non Object) return type
392 int me;
393 int ms = iklass->find_method_by_name(name, &me);
394 if (ms == -1) return false;
395 for (; ms < me; ms++) {
396 Method* m = iklass->methods()->at(ms);
397 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
398 int flags = m->access_flags().as_int();
399 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
400 return true;
401 }
402 }
403 return false;
404 }
405
406
407 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
408 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
409 switch (iid) {
410 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
411 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
412 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
413 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
414 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
415 default:
416 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
417 return 0;
418 }
419 }
420
421 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
422 switch(id) {
423 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
424 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
425 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
426 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
427 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
428 default:
429 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
430 return Bytecodes::_illegal;
431 }
432 }
433
434 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
435 switch (iid) {
436 case vmIntrinsics::_invokeBasic: return 0;
437 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
438 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
439 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
440 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
441 default:
442 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
443 return 0;
444 }
445 }
446
447 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
448 vmSymbols::SID name_id = vmSymbols::find_sid(name);
449 switch (name_id) {
450 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
451 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
452 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
453 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
454
455 // There is one static signature-polymorphic method for each JVM invocation mode.
456 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
457 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
458 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
459 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
460 default: break;
461 }
462
463 // Cover the case of invokeExact and any future variants of invokeFoo.
464 Klass* mh_klass = SystemDictionary::well_known_klass(
465 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
466 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
467 return vmIntrinsics::_invokeGeneric;
468 }
469
470 // Cover the case of methods on VarHandle.
471 Klass* vh_klass = SystemDictionary::well_known_klass(
472 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) );
473 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
474 return vmIntrinsics::_invokeGeneric;
475 }
476
477 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
478 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
479 return vmIntrinsics::_none;
480 }
481
482 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
483 if (klass != NULL &&
484 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
485 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
486 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
487 if (iid != vmIntrinsics::_none)
488 return iid;
489 if (is_method_handle_invoke_name(klass, name))
490 return vmIntrinsics::_invokeGeneric;
491 }
492 return vmIntrinsics::_none;
493 }
494
495 // Returns true if method is signature polymorphic and public
496 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
497 if (is_signature_polymorphic_name(klass, name)) {
498 InstanceKlass* iklass = InstanceKlass::cast(klass);
499 int me;
500 int ms = iklass->find_method_by_name(name, &me);
501 assert(ms != -1, "");
502 for (; ms < me; ms++) {
503 Method* m = iklass->methods()->at(ms);
504 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
505 int flags = m->access_flags().as_int();
506 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
507 return true;
508 }
509 }
510 }
511 return false;
512 }
513
514 // convert the external string or reflective type to an internal signature
515 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
516 if (java_lang_invoke_MethodType::is_instance(type_str)) {
517 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
518 } else if (java_lang_Class::is_instance(type_str)) {
519 return java_lang_Class::as_signature(type_str, false, THREAD);
520 } else if (java_lang_String::is_instance_inlined(type_str)) {
521 if (intern_if_not_found) {
522 return java_lang_String::as_symbol(type_str, THREAD);
523 } else {
524 return java_lang_String::as_symbol_or_null(type_str);
525 }
526 } else {
527 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
528 }
529 }
530
531 static const char OBJ_SIG[] = "Ljava/lang/Object;";
532 enum { OBJ_SIG_LEN = 18 };
533
534 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
535 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
536 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
537 const int len = sig->utf8_length();
538 for (int i = 0; i < len; i++) {
539 switch (sig->byte_at(i)) {
540 case 'L':
541 // only java/lang/Object is valid here
542 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
543 return false;
544 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
545 continue;
546 case '(': case ')': case 'V':
547 case 'I': case 'J': case 'F': case 'D':
548 continue;
549 //case '[':
550 //case 'Z': case 'B': case 'C': case 'S':
551 default:
552 return false;
553 }
554 }
555 return true;
556 }
557
558 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
559 Symbol* bsig = NULL;
560 if (sig == NULL) {
561 return sig;
562 } else if (is_basic_type_signature(sig)) {
563 sig->increment_refcount();
564 return sig; // that was easy
565 } else if (sig->byte_at(0) != '(') {
566 BasicType bt = char2type(sig->byte_at(0));
567 if (is_subword_type(bt)) {
568 bsig = vmSymbols::int_signature();
569 } else {
570 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
571 bsig = vmSymbols::object_signature();
572 }
573 } else {
574 ResourceMark rm;
575 stringStream buffer(128);
576 buffer.put('(');
577 int arg_pos = 0, keep_arg_pos = -1;
578 if (keep_last_arg)
579 keep_arg_pos = ArgumentCount(sig).size() - 1;
580 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
581 BasicType bt = ss.type();
582 size_t this_arg_pos = buffer.size();
583 if (ss.at_return_type()) {
584 buffer.put(')');
585 }
586 if (arg_pos == keep_arg_pos) {
587 buffer.write((char*) ss.raw_bytes(),
588 (int) ss.raw_length());
589 } else if (bt == T_OBJECT || bt == T_ARRAY) {
590 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
591 } else {
592 if (is_subword_type(bt))
593 bt = T_INT;
594 buffer.put(type2char(bt));
595 }
596 arg_pos++;
597 }
598 const char* sigstr = buffer.base();
599 int siglen = (int) buffer.size();
600 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
601 }
602 assert(is_basic_type_signature(bsig) ||
603 // detune assert in case the injected argument is not a basic type:
604 keep_last_arg, "");
605 return bsig;
606 }
607
608 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
609 Symbol* sig,
610 bool keep_arrays,
611 bool keep_basic_names) {
612 st = st ? st : tty;
613 int len = sig->utf8_length();
614 int array = 0;
615 bool prev_type = false;
616 for (int i = 0; i < len; i++) {
617 char ch = sig->byte_at(i);
618 switch (ch) {
619 case '(': case ')':
620 prev_type = false;
621 st->put(ch);
622 continue;
623 case '[':
624 if (!keep_basic_names && keep_arrays)
625 st->put(ch);
626 array++;
627 continue;
628 case 'L':
629 {
630 if (prev_type) st->put(',');
631 int start = i+1, slash = start;
632 while (++i < len && (ch = sig->byte_at(i)) != ';') {
633 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
634 }
635 if (slash < i) start = slash;
636 if (!keep_basic_names) {
637 st->put('L');
638 } else {
639 for (int j = start; j < i; j++)
640 st->put(sig->byte_at(j));
641 prev_type = true;
642 }
643 break;
644 }
645 default:
646 {
647 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
648 ch = '[';
649 array = 0;
650 }
651 if (prev_type) st->put(',');
652 const char* n = NULL;
653 if (keep_basic_names)
654 n = type2name(char2type(ch));
655 if (n == NULL) {
656 // unknown letter, or we don't want to know its name
657 st->put(ch);
658 } else {
659 st->print("%s", n);
660 prev_type = true;
661 }
662 break;
663 }
664 }
665 // Switch break goes here to take care of array suffix:
666 if (prev_type) {
667 while (array > 0) {
668 st->print("[]");
669 --array;
670 }
671 }
672 array = 0;
673 }
674 }
675
676
677
678 static oop object_java_mirror() {
679 return SystemDictionary::Object_klass()->java_mirror();
680 }
681
682 oop MethodHandles::field_name_or_null(Symbol* s) {
683 if (s == NULL) return NULL;
684 return StringTable::lookup(s);
685 }
686
687 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
688 if (s == NULL) return NULL;
689 BasicType bt = FieldType::basic_type(s);
690 if (is_java_primitive(bt)) {
691 assert(s->utf8_length() == 1, "");
692 return java_lang_Class::primitive_mirror(bt);
693 }
694 // Here are some more short cuts for common types.
695 // They are optional, since reference types can be resolved lazily.
696 if (bt == T_OBJECT) {
697 if (s == vmSymbols::object_signature()) {
698 return object_java_mirror();
699 } else if (s == vmSymbols::class_signature()) {
700 return SystemDictionary::Class_klass()->java_mirror();
701 } else if (s == vmSymbols::string_signature()) {
702 return SystemDictionary::String_klass()->java_mirror();
703 }
704 }
705 return NULL;
706 }
707
708
709 // An unresolved member name is a mere symbolic reference.
710 // Resolving it plants a vmtarget/vmindex in it,
711 // which refers directly to JVM internals.
712 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller,
713 bool speculative_resolve, TRAPS) {
714 Handle empty;
715 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
716
717 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
718 // Already resolved.
719 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
720 assert(vmindex >= Method::nonvirtual_vtable_index, "");
721 return mname;
722 }
723
724 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
725 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
726 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
727 int flags = java_lang_invoke_MemberName::flags(mname());
728 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
729 if (!ref_kind_is_valid(ref_kind)) {
730 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
731 }
732
733 DEBUG_ONLY(int old_vmindex);
734 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
735
736 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
737 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
738 }
739
740 InstanceKlass* defc = NULL;
741 {
742 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
743 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
744 if (!defc_klass->is_instance_klass()) {
745 if (!defc_klass->is_array_klass()) return empty;
746 defc_klass = SystemDictionary::Object_klass();
747 }
748 defc = InstanceKlass::cast(defc_klass);
749 }
750 if (defc == NULL) {
751 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
752 }
753 defc->link_class(CHECK_(empty)); // possible safepoint
754
755 // convert the external string name to an internal symbol
756 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
757 if (name == NULL) return empty; // no such name
758 if (name == vmSymbols::class_initializer_name())
759 return empty; // illegal name
760
761 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
762 if ((flags & ALL_KINDS) == IS_METHOD &&
763 (defc == SystemDictionary::MethodHandle_klass() || defc == SystemDictionary::VarHandle_klass()) &&
764 (ref_kind == JVM_REF_invokeVirtual ||
765 ref_kind == JVM_REF_invokeSpecial ||
766 // static invocation mode is required for _linkToVirtual, etc.:
767 ref_kind == JVM_REF_invokeStatic)) {
768 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
769 if (iid != vmIntrinsics::_none &&
770 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
771 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
772 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
773 mh_invoke_id = iid;
774 }
775 }
776
777 // convert the external string or reflective type to an internal signature
778 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
779 if (type == NULL) return empty; // no such signature exists in the VM
780
781 LinkInfo::AccessCheck access_check = caller != NULL ?
782 LinkInfo::needs_access_check :
783 LinkInfo::skip_access_check;
784
785 // Time to do the lookup.
786 switch (flags & ALL_KINDS) {
787 case IS_METHOD:
788 {
789 CallInfo result;
790 LinkInfo link_info(defc, name, type, caller, access_check);
791 {
792 assert(!HAS_PENDING_EXCEPTION, "");
793 if (ref_kind == JVM_REF_invokeStatic) {
794 LinkResolver::resolve_static_call(result,
795 link_info, false, THREAD);
796 } else if (ref_kind == JVM_REF_invokeInterface) {
797 LinkResolver::resolve_interface_call(result, Handle(), defc,
798 link_info, false, THREAD);
799 } else if (mh_invoke_id != vmIntrinsics::_none) {
800 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
801 LinkResolver::resolve_handle_call(result, link_info, THREAD);
802 } else if (ref_kind == JVM_REF_invokeSpecial) {
803 LinkResolver::resolve_special_call(result, Handle(),
804 link_info, THREAD);
805 } else if (ref_kind == JVM_REF_invokeVirtual) {
806 LinkResolver::resolve_virtual_call(result, Handle(), defc,
807 link_info, false, THREAD);
808 } else {
809 assert(false, "ref_kind=%d", ref_kind);
810 }
811 if (HAS_PENDING_EXCEPTION) {
812 if (speculative_resolve) {
813 CLEAR_PENDING_EXCEPTION;
814 }
815 return empty;
816 }
817 }
818 if (result.resolved_appendix().not_null()) {
819 // The resolved MemberName must not be accompanied by an appendix argument,
820 // since there is no way to bind this value into the MemberName.
821 // Caller is responsible to prevent this from happening.
822 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
823 }
824 result.set_resolved_method_name(CHECK_(empty));
825 oop mname2 = init_method_MemberName(mname, result);
826 return Handle(THREAD, mname2);
827 }
828 case IS_CONSTRUCTOR:
829 {
830 CallInfo result;
831 LinkInfo link_info(defc, name, type, caller, access_check);
832 {
833 assert(!HAS_PENDING_EXCEPTION, "");
834 if (name == vmSymbols::object_initializer_name()) {
835 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
836 } else {
837 break; // will throw after end of switch
838 }
839 if (HAS_PENDING_EXCEPTION) {
840 if (speculative_resolve) {
841 CLEAR_PENDING_EXCEPTION;
842 }
843 return empty;
844 }
845 }
846 assert(result.is_statically_bound(), "");
847 result.set_resolved_method_name(CHECK_(empty));
848 oop mname2 = init_method_MemberName(mname, result);
849 return Handle(THREAD, mname2);
850 }
851 case IS_FIELD:
852 {
853 fieldDescriptor result; // find_field initializes fd if found
854 {
855 assert(!HAS_PENDING_EXCEPTION, "");
856 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
857 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
858 if (HAS_PENDING_EXCEPTION) {
859 if (speculative_resolve) {
860 CLEAR_PENDING_EXCEPTION;
861 }
862 return empty;
863 }
864 }
865 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
866 return Handle(THREAD, mname2);
867 }
868 default:
869 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
870 }
871
872 return empty;
873 }
874
875 // Conversely, a member name which is only initialized from JVM internals
876 // may have null defc, name, and type fields.
877 // Resolving it plants a vmtarget/vmindex in it,
878 // which refers directly to JVM internals.
879 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
880 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
881
882 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
883 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
884 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
885 int flags = java_lang_invoke_MemberName::flags(mname());
886
887 if (suppress != 0) {
888 if (suppress & _suppress_defc) have_defc = true;
889 if (suppress & _suppress_name) have_name = true;
890 if (suppress & _suppress_type) have_type = true;
891 }
892
893 if (have_defc && have_name && have_type) return; // nothing needed
894
895 switch (flags & ALL_KINDS) {
896 case IS_METHOD:
897 case IS_CONSTRUCTOR:
898 {
899 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
900 if (vmtarget == NULL) {
901 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
902 }
903 methodHandle m(THREAD, vmtarget);
904 DEBUG_ONLY(vmtarget = NULL); // safety
905 if (!have_defc) {
906 InstanceKlass* defc = m->method_holder();
907 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
908 }
909 if (!have_name) {
910 //not java_lang_String::create_from_symbol; let's intern member names
911 oop name = StringTable::intern(m->name(), CHECK);
912 java_lang_invoke_MemberName::set_name(mname(), name);
913 }
914 if (!have_type) {
915 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
916 java_lang_invoke_MemberName::set_type(mname(), type());
917 }
918 return;
919 }
920 case IS_FIELD:
921 {
922 oop clazz = java_lang_invoke_MemberName::clazz(mname());
923 if (clazz == NULL) {
924 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
925 }
926 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
927 DEBUG_ONLY(clazz = NULL); // safety
928 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
929 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
930 fieldDescriptor fd; // find_field initializes fd if found
931 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
932 break; // cannot expand
933 if (!have_name) {
934 //not java_lang_String::create_from_symbol; let's intern member names
935 oop name = StringTable::intern(fd.name(), CHECK);
936 java_lang_invoke_MemberName::set_name(mname(), name);
937 }
938 if (!have_type) {
939 // If it is a primitive field type, don't mess with short strings like "I".
940 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
941 if (type.is_null()) {
942 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
943 }
944 java_lang_invoke_MemberName::set_type(mname(), type());
945 }
946 return;
947 }
948 }
949 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
950 }
951
952 int MethodHandles::find_MemberNames(Klass* k,
953 Symbol* name, Symbol* sig,
954 int mflags, Klass* caller,
955 int skip, objArrayHandle results, TRAPS) {
956 // %%% take caller into account!
957
958 Thread* thread = Thread::current();
959
960 if (k == NULL || !k->is_instance_klass()) return -1;
961
962 int rfill = 0, rlimit = results->length(), rskip = skip;
963 // overflow measurement:
964 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
965
966 int match_flags = mflags;
967 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
968 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
969 bool local_only = !(search_superc | search_intfc);
970 bool classes_only = false;
971
972 if (name != NULL) {
973 if (name->utf8_length() == 0) return 0; // a match is not possible
974 }
975 if (sig != NULL) {
976 if (sig->utf8_length() == 0) return 0; // a match is not possible
977 if (sig->byte_at(0) == '(')
978 match_flags &= ~(IS_FIELD | IS_TYPE);
979 else
980 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
981 }
982
983 if ((match_flags & IS_TYPE) != 0) {
984 // NYI, and Core Reflection works quite well for this query
985 }
986
987 if ((match_flags & IS_FIELD) != 0) {
988 InstanceKlass* ik = InstanceKlass::cast(k);
989 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
990 if (name != NULL && st.name() != name)
991 continue;
992 if (sig != NULL && st.signature() != sig)
993 continue;
994 // passed the filters
995 if (rskip > 0) {
996 --rskip;
997 } else if (rfill < rlimit) {
998 Handle result(thread, results->obj_at(rfill++));
999 if (!java_lang_invoke_MemberName::is_instance(result()))
1000 return -99; // caller bug!
1001 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
1002 if (!oopDesc::equals(saved, result()))
1003 results->obj_at_put(rfill-1, saved); // show saved instance to user
1004 } else if (++overflow >= overflow_limit) {
1005 match_flags = 0; break; // got tired of looking at overflow
1006 }
1007 }
1008 }
1009
1010 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
1011 // watch out for these guys:
1012 Symbol* init_name = vmSymbols::object_initializer_name();
1013 Symbol* clinit_name = vmSymbols::class_initializer_name();
1014 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
1015 bool negate_name_test = false;
1016 // fix name so that it captures the intention of IS_CONSTRUCTOR
1017 if (!(match_flags & IS_METHOD)) {
1018 // constructors only
1019 if (name == NULL) {
1020 name = init_name;
1021 } else if (name != init_name) {
1022 return 0; // no constructors of this method name
1023 }
1024 } else if (!(match_flags & IS_CONSTRUCTOR)) {
1025 // methods only
1026 if (name == NULL) {
1027 name = init_name;
1028 negate_name_test = true; // if we see the name, we *omit* the entry
1029 } else if (name == init_name) {
1030 return 0; // no methods of this constructor name
1031 }
1032 } else {
1033 // caller will accept either sort; no need to adjust name
1034 }
1035 InstanceKlass* ik = InstanceKlass::cast(k);
1036 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
1037 Method* m = st.method();
1038 Symbol* m_name = m->name();
1039 if (m_name == clinit_name)
1040 continue;
1041 if (name != NULL && ((m_name != name) ^ negate_name_test))
1042 continue;
1043 if (sig != NULL && m->signature() != sig)
1044 continue;
1045 // passed the filters
1046 if (rskip > 0) {
1047 --rskip;
1048 } else if (rfill < rlimit) {
1049 Handle result(thread, results->obj_at(rfill++));
1050 if (!java_lang_invoke_MemberName::is_instance(result()))
1051 return -99; // caller bug!
1052 CallInfo info(m, NULL, CHECK_0);
1053 oop saved = MethodHandles::init_method_MemberName(result, info);
1054 if (!oopDesc::equals(saved, result()))
1055 results->obj_at_put(rfill-1, saved); // show saved instance to user
1056 } else if (++overflow >= overflow_limit) {
1057 match_flags = 0; break; // got tired of looking at overflow
1058 }
1059 }
1060 }
1061
1062 // return number of elements we at leasted wanted to initialize
1063 return rfill + overflow;
1064 }
1065
1066 // Is it safe to remove stale entries from a dependency list?
1067 static bool safe_to_expunge() {
1068 // Since parallel GC threads can concurrently iterate over a dependency
1069 // list during safepoint, it is safe to remove entries only when
1070 // CodeCache lock is held.
1071 return CodeCache_lock->owned_by_self();
1072 }
1073
1074 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
1075 assert_locked_or_safepoint(CodeCache_lock);
1076
1077 oop context = java_lang_invoke_CallSite::context(call_site);
1078 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1079 // Try to purge stale entries on updates.
1080 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
1081 // in order to avoid memory leak, stale entries are purged whenever a dependency list
1082 // is changed (both on addition and removal). Though memory reclamation is delayed,
1083 // it avoids indefinite memory usage growth.
1084 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
1085 }
1086
1087 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
1088 assert_locked_or_safepoint(CodeCache_lock);
1089
1090 oop context = java_lang_invoke_CallSite::context(call_site);
1091 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1092 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
1093 }
1094
1095 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
1096 assert_lock_strong(Compile_lock);
1097
1098 int marked = 0;
1099 CallSiteDepChange changes(call_site, target);
1100 {
1101 NoSafepointVerifier nsv;
1102 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1103
1104 oop context = java_lang_invoke_CallSite::context(call_site());
1105 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1106 marked = deps.mark_dependent_nmethods(changes);
1107 }
1108 if (marked > 0) {
1109 // At least one nmethod has been marked for deoptimization.
1110 VM_Deoptimize op;
1111 VMThread::execute(&op);
1112 }
1113 }
1114
1115 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
1116 if (TraceMethodHandles) {
1117 const char* name = vmIntrinsics::name_at(iid);
1118 if (*name == '_') name += 1;
1119 const size_t len = strlen(name) + 50;
1120 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
1121 const char* suffix = "";
1122 if (is_signature_polymorphic(iid)) {
1123 if (is_signature_polymorphic_static(iid))
1124 suffix = "/static";
1125 else
1126 suffix = "/private";
1127 }
1128 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
1129 trace_method_handle(_masm, qname);
1130 // Note: Don't free the allocated char array because it's used
1131 // during runtime.
1132 }
1133 }
1134
1135 //
1136 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1137 // They are the private interface between this JVM and the HotSpot-specific
1138 // Java code that implements JSR 292 method handles.
1139 //
1140 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1141 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1142 //
1143
1144 #ifndef PRODUCT
1145 #define EACH_NAMED_CON(template, requirement) \
1146 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1147 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1148 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1149 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1150 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1151 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1152 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1153 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1154 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1155 /*end*/
1156
1157 #define IGNORE_REQ(req_expr) /* req_expr */
1158 #define ONE_PLUS(scope,value) 1+
1159 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1160 #define VALUE_COMMA(scope,value) scope::value,
1161 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1162 #define STRING_NULL(scope,value) #value "\0"
1163 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1164
1165 static bool advertise_con_value(int which) {
1166 if (which < 0) return false;
1167 bool ok = true;
1168 int count = 0;
1169 #define INC_COUNT(scope,value) \
1170 ++count;
1171 #define CHECK_REQ(req_expr) \
1172 if (which < count) return ok; \
1173 ok = (req_expr);
1174 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1175 #undef INC_COUNT
1176 #undef CHECK_REQ
1177 assert(count == con_value_count, "");
1178 if (which < count) return ok;
1179 return false;
1180 }
1181
1182 #undef ONE_PLUS
1183 #undef VALUE_COMMA
1184 #undef STRING_NULL
1185 #undef EACH_NAMED_CON
1186 #endif // PRODUCT
1187
1188 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1189 #ifndef PRODUCT
1190 if (advertise_con_value(which)) {
1191 assert(which >= 0 && which < con_value_count, "");
1192 int con = con_values[which];
1193 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1194 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1195 const char* str = &con_names[0];
1196 for (int i = 0; i < which; i++)
1197 str += strlen(str) + 1; // skip name and null
1198 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1199 box->obj_at_put(0, name);
1200 }
1201 return con;
1202 }
1203 #endif
1204 return 0;
1205 }
1206 JVM_END
1207
1208 // void init(MemberName self, AccessibleObject ref)
1209 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1210 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1211 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1212 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1213 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1214 MethodHandles::init_MemberName(mname, target, CHECK);
1215 }
1216 JVM_END
1217
1218 // void expand(MemberName self)
1219 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1220 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1221 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1222 MethodHandles::expand_MemberName(mname, 0, CHECK);
1223 }
1224 JVM_END
1225
1226 // void resolve(MemberName self, Class<?> caller)
1227 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1228 jboolean speculative_resolve)) {
1229 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1230 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1231
1232 // The trusted Java code that calls this method should already have performed
1233 // access checks on behalf of the given caller. But, we can verify this.
1234 if (VerifyMethodHandles && caller_jh != NULL &&
1235 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1236 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1237 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1238 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1239 }
1240
1241 // Reflection::verify_class_access can only handle instance classes.
1242 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1243 // Emulate LinkResolver::check_klass_accessability.
1244 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1245 if (caller != SystemDictionary::Object_klass()
1246 && Reflection::verify_class_access(caller,
1247 InstanceKlass::cast(reference_klass),
1248 true) != Reflection::ACCESS_OK) {
1249 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1250 }
1251 }
1252 }
1253
1254 Klass* caller = caller_jh == NULL ? NULL :
1255 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1256 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, speculative_resolve == JNI_TRUE,
1257 CHECK_NULL);
1258
1259 if (resolved.is_null()) {
1260 int flags = java_lang_invoke_MemberName::flags(mname());
1261 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1262 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1263 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1264 }
1265 if (speculative_resolve) {
1266 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1267 return NULL;
1268 }
1269 if ((flags & ALL_KINDS) == IS_FIELD) {
1270 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1271 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1272 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1273 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1274 } else {
1275 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1276 }
1277 }
1278
1279 return JNIHandles::make_local(THREAD, resolved());
1280 }
1281 JVM_END
1282
1283 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1284 if (mname == NULL ||
1285 java_lang_invoke_MemberName::clazz(mname) == NULL) {
1286 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1287 } else {
1288 int flags = java_lang_invoke_MemberName::flags(mname);
1289 if ((flags & IS_FIELD) != 0 &&
1290 (must_be_static
1291 ? (flags & JVM_ACC_STATIC) != 0
1292 : (flags & JVM_ACC_STATIC) == 0)) {
1293 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1294 return (jlong) vmindex;
1295 }
1296 }
1297 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1298 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1299 return 0;
1300 }
1301
1302 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1303 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1304 }
1305 JVM_END
1306
1307 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1308 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1309 }
1310 JVM_END
1311
1312 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1313 // use the other function to perform sanity checks:
1314 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1315 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1316 return JNIHandles::make_local(THREAD, clazz);
1317 }
1318 JVM_END
1319
1320 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1321 if (mname_jh == NULL) return NULL;
1322 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1323 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1324 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1325 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1326 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1327 result->obj_at_put(0, x);
1328
1329 int flags = java_lang_invoke_MemberName::flags(mname());
1330 if ((flags & IS_FIELD) != 0) {
1331 x = java_lang_invoke_MemberName::clazz(mname());
1332 } else {
1333 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1334 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1335 x = mname();
1336 }
1337 result->obj_at_put(1, x);
1338 return JNIHandles::make_local(env, result());
1339 }
1340 JVM_END
1341
1342
1343
1344 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1345 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1346 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1347 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1348 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1349 if (clazz_jh == NULL || results_jh == NULL) return -1;
1350 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1351
1352 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1353 if (results.is_null() || !results->is_objArray()) return -1;
1354
1355 TempNewSymbol name = NULL;
1356 TempNewSymbol sig = NULL;
1357 if (name_jh != NULL) {
1358 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1359 if (name == NULL) return 0; // a match is not possible
1360 }
1361 if (sig_jh != NULL) {
1362 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1363 if (sig == NULL) return 0; // a match is not possible
1364 }
1365
1366 Klass* caller = NULL;
1367 if (caller_jh != NULL) {
1368 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1369 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1370 caller = java_lang_Class::as_Klass(caller_oop);
1371 }
1372
1373 if (name != NULL && sig != NULL && results.not_null()) {
1374 // try a direct resolve
1375 // %%% TO DO
1376 }
1377
1378 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1379 caller, skip, results, CHECK_0);
1380 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1381 return res;
1382 }
1383 JVM_END
1384
1385 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1386 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1387 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1388 {
1389 // Walk all nmethods depending on this call site.
1390 MutexLocker mu(Compile_lock, thread);
1391 MethodHandles::flush_dependent_nmethods(call_site, target);
1392 java_lang_invoke_CallSite::set_target(call_site(), target());
1393 }
1394 }
1395 JVM_END
1396
1397 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1398 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1399 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1400 {
1401 // Walk all nmethods depending on this call site.
1402 MutexLocker mu(Compile_lock, thread);
1403 MethodHandles::flush_dependent_nmethods(call_site, target);
1404 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1405 }
1406 }
1407 JVM_END
1408
1409 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1410 jobject caller_jh, jintArray index_info_jh,
1411 jint start, jint end,
1412 jobjectArray buf_jh, jint pos,
1413 jboolean resolve, jobject ifna_jh)) {
1414 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1415 if (caller_k == NULL || !caller_k->is_instance_klass()) {
1416 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1417 }
1418 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1419 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1420 if (index_info_oop == NULL ||
1421 index_info_oop->klass() != Universe::intArrayKlassObj() ||
1422 typeArrayOop(index_info_oop)->length() < 2) {
1423 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1424 }
1425 typeArrayHandle index_info(THREAD, index_info_oop);
1426 int bss_index_in_pool = index_info->int_at(1);
1427 // While we are here, take a quick look at the index info:
1428 if (bss_index_in_pool <= 0 ||
1429 bss_index_in_pool >= caller->constants()->length() ||
1430 index_info->int_at(0)
1431 != caller->constants()->invoke_dynamic_argument_count_at(bss_index_in_pool)) {
1432 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1433 }
1434 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1435 if (start < 0) {
1436 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1437 if (start == pseudo_index) {
1438 if (start >= end || 0 > pos || pos >= buf->length()) break;
1439 oop pseudo_arg = NULL;
1440 switch (pseudo_index) {
1441 case -4: // bootstrap method
1442 {
1443 int bsm_index = caller->constants()->invoke_dynamic_bootstrap_method_ref_index_at(bss_index_in_pool);
1444 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1445 break;
1446 }
1447 case -3: // name
1448 {
1449 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool);
1450 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1451 pseudo_arg = str();
1452 break;
1453 }
1454 case -2: // type
1455 {
1456 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool);
1457 Handle th;
1458 if (type->byte_at(0) == '(') {
1459 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1460 } else {
1461 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1462 }
1463 pseudo_arg = th();
1464 break;
1465 }
1466 case -1: // argument count
1467 {
1468 int argc = caller->constants()->invoke_dynamic_argument_count_at(bss_index_in_pool);
1469 jvalue argc_value; argc_value.i = (jint)argc;
1470 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1471 break;
1472 }
1473 }
1474
1475 // Store the pseudo-argument, and advance the pointers.
1476 buf->obj_at_put(pos++, pseudo_arg);
1477 ++start;
1478 }
1479 }
1480 // When we are done with this there may be regular arguments to process too.
1481 }
1482 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1483 caller->constants()->
1484 copy_bootstrap_arguments_at(bss_index_in_pool,
1485 start, end, buf, pos,
1486 (resolve == JNI_TRUE), ifna, CHECK);
1487 }
1488 JVM_END
1489
1490 // It is called by a Cleaner object which ensures that dropped CallSites properly
1491 // deallocate their dependency information.
1492 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1493 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1494 {
1495 // Walk all nmethods depending on this call site.
1496 MutexLocker mu1(Compile_lock, thread);
1497
1498 int marked = 0;
1499 {
1500 NoSafepointVerifier nsv;
1501 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1502 assert(safe_to_expunge(), "removal is not safe");
1503 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1504 marked = deps.remove_all_dependents();
1505 }
1506 if (marked > 0) {
1507 // At least one nmethod has been marked for deoptimization
1508 VM_Deoptimize op;
1509 VMThread::execute(&op);
1510 }
1511 }
1512 }
1513 JVM_END
1514
1515 /**
1516 * Throws a java/lang/UnsupportedOperationException unconditionally.
1517 * This is required by the specification of MethodHandle.invoke if
1518 * invoked directly.
1519 */
1520 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1521 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1522 return NULL;
1523 }
1524 JVM_END
1525
1526 /**
1527 * Throws a java/lang/UnsupportedOperationException unconditionally.
1528 * This is required by the specification of MethodHandle.invokeExact if
1529 * invoked directly.
1530 */
1531 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1532 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1533 return NULL;
1534 }
1535 JVM_END
1536
1537 /// JVM_RegisterMethodHandleMethods
1538
1539 #undef CS // Solaris builds complain
1540
1541 #define LANG "Ljava/lang/"
1542 #define JLINV "Ljava/lang/invoke/"
1543
1544 #define OBJ LANG "Object;"
1545 #define CLS LANG "Class;"
1546 #define STRG LANG "String;"
1547 #define CS JLINV "CallSite;"
1548 #define MT JLINV "MethodType;"
1549 #define MH JLINV "MethodHandle;"
1550 #define MEM JLINV "MemberName;"
1551 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1552
1553 #define CC (char*) /*cast a literal from (const char*)*/
1554 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1555
1556 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1557 static JNINativeMethod MHN_methods[] = {
1558 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1559 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1560 {CC "resolve", CC "(" MEM "" CLS "Z)" MEM, FN_PTR(MHN_resolve_Mem)},
1561 // static native int getNamedCon(int which, Object[] name)
1562 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1563 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1564 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1565 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1566 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1567 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1568 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1569 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1570 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1571 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1572 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1573 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1574 };
1575
1576 static JNINativeMethod MH_methods[] = {
1577 // UnsupportedOperationException throwers
1578 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1579 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1580 };
1581
1582 /**
1583 * This one function is exported, used by NativeLookup.
1584 */
1585 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1586 assert(!MethodHandles::enabled(), "must not be enabled");
1587 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1588
1589 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1590 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1591
1592 {
1593 ThreadToNativeFromVM ttnfv(thread);
1594
1595 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1596 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1597 "register java.lang.invoke.MethodHandleNative natives");
1598
1599 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1600 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1601 "register java.lang.invoke.MethodHandle natives");
1602 }
1603
1604 if (TraceInvokeDynamic) {
1605 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1606 }
1607
1608 MethodHandles::set_enabled(true);
1609 }
1610 JVM_END