1 /*
2 * Copyright (c) 2008, 2019, 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/fieldDescriptor.inline.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/interfaceSupport.inline.hpp"
45 #include "runtime/javaCalls.hpp"
46 #include "runtime/jniHandles.inline.hpp"
47 #include "runtime/timerTrace.hpp"
48 #include "runtime/reflection.hpp"
49 #include "runtime/safepointVerifiers.hpp"
50 #include "runtime/signature.hpp"
51 #include "runtime/stubRoutines.hpp"
52 #include "utilities/exceptions.hpp"
53
54
55 /*
56 * JSR 292 reference implementation: method handles
57 * The JDK 7 reference implementation represented method handle
58 * combinations as chains. Each link in the chain had a "vmentry"
59 * field which pointed at a bit of assembly code which performed
60 * one transformation before dispatching to the next link in the chain.
61 *
62 * The current reference implementation pushes almost all code generation
63 * responsibility to (trusted) Java code. A method handle contains a
64 * pointer to its "LambdaForm", which embodies all details of the method
65 * handle's behavior. The LambdaForm is a normal Java object, managed
66 * by a runtime coded in Java.
67 */
68
69 bool MethodHandles::_enabled = false; // set true after successful native linkage
70 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
71
72 /**
73 * Generates method handle adapters. Returns 'false' if memory allocation
74 * failed and true otherwise.
75 */
76 void MethodHandles::generate_adapters() {
77 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
78 assert(_adapter_code == NULL, "generate only once");
79
80 ResourceMark rm;
81 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
82 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
83 CodeBuffer code(_adapter_code);
84 MethodHandlesAdapterGenerator g(&code);
85 g.generate();
86 code.log_section_sizes("MethodHandlesAdapterBlob");
87 }
88
89 //------------------------------------------------------------------------------
90 // MethodHandlesAdapterGenerator::generate
91 //
92 void MethodHandlesAdapterGenerator::generate() {
93 // Generate generic method handle adapters.
94 // Generate interpreter entries
95 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
96 mk <= Interpreter::method_handle_invoke_LAST;
97 mk = Interpreter::MethodKind(1 + (int)mk)) {
98 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
99 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
100 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
101 if (entry != NULL) {
102 Interpreter::set_entry_for_kind(mk, entry);
103 }
104 // If the entry is not set, it will throw AbstractMethodError.
105 }
106 }
107
108 void MethodHandles::set_enabled(bool z) {
109 if (_enabled != z) {
110 guarantee(z, "can only enable once");
111 _enabled = z;
112 }
113 }
114
115 // MemberName support
116
117 // import java_lang_invoke_MemberName.*
118 enum {
119 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
120 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
121 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
122 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
123 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
124 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
125 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
126 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
127 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
128 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
129 };
130
131 int MethodHandles::ref_kind_to_flags(int ref_kind) {
132 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
133 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
134 if (ref_kind_is_field(ref_kind)) {
135 flags |= IS_FIELD;
136 } else if (ref_kind_is_method(ref_kind)) {
137 flags |= IS_METHOD;
138 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
139 flags |= IS_CONSTRUCTOR;
140 }
141 return flags;
142 }
143
144 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
145 Handle empty;
146 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
147 if (!java_lang_String::is_instance_inlined(type())) {
148 return type; // already resolved
149 }
150 Symbol* signature = java_lang_String::as_symbol_or_null(type());
151 if (signature == NULL) {
152 return empty; // no such signature exists in the VM
153 }
154 Handle resolved;
155 int flags = java_lang_invoke_MemberName::flags(mname());
156 switch (flags & ALL_KINDS) {
157 case IS_METHOD:
158 case IS_CONSTRUCTOR:
159 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
160 break;
161 case IS_FIELD:
162 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
163 break;
164 default:
165 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
166 }
167 if (resolved.is_null()) {
168 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
169 }
170 return resolved;
171 }
172
173 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
174 // This method is used from java.lang.invoke.MemberName constructors.
175 // It fills in the new MemberName from a java.lang.reflect.Member.
176 Thread* thread = Thread::current();
177 oop target_oop = target();
178 Klass* target_klass = target_oop->klass();
179 if (target_klass == SystemDictionary::reflect_Field_klass()) {
180 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
181 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
182 Klass* k = java_lang_Class::as_Klass(clazz);
183 if (k != NULL && k->is_instance_klass()) {
184 fieldDescriptor fd(InstanceKlass::cast(k), slot);
185 oop mname2 = init_field_MemberName(mname, fd);
186 if (mname2 != NULL) {
187 // Since we have the reified name and type handy, add them to the result.
188 if (java_lang_invoke_MemberName::name(mname2) == NULL)
189 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
190 if (java_lang_invoke_MemberName::type(mname2) == NULL)
191 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
192 }
193 return mname2;
194 }
195 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
196 oop clazz = java_lang_reflect_Method::clazz(target_oop);
197 int slot = java_lang_reflect_Method::slot(target_oop);
198 Klass* k = java_lang_Class::as_Klass(clazz);
199 if (k != NULL && k->is_instance_klass()) {
200 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
201 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
202 return NULL; // do not resolve unless there is a concrete signature
203 CallInfo info(m, k, CHECK_NULL);
204 return init_method_MemberName(mname, info);
205 }
206 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
207 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
208 int slot = java_lang_reflect_Constructor::slot(target_oop);
209 Klass* k = java_lang_Class::as_Klass(clazz);
210 if (k != NULL && k->is_instance_klass()) {
211 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
212 if (m == NULL) return NULL;
213 CallInfo info(m, k, CHECK_NULL);
214 return init_method_MemberName(mname, info);
215 }
216 }
217 return NULL;
218 }
219
220 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
221 assert(info.resolved_appendix().is_null(), "only normal methods here");
222 methodHandle m = info.resolved_method();
223 assert(m.not_null(), "null method handle");
224 InstanceKlass* m_klass = m->method_holder();
225 assert(m_klass != NULL, "null holder for method handle");
226 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
227 int vmindex = Method::invalid_vtable_index;
228
229 switch (info.call_kind()) {
230 case CallInfo::itable_call:
231 vmindex = info.itable_index();
232 // More importantly, the itable index only works with the method holder.
233 assert(m_klass->verify_itable_index(vmindex), "");
234 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
235 if (TraceInvokeDynamic) {
236 ttyLocker ttyl;
237 ResourceMark rm;
238 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
239 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
240 vmindex);
241 m->access_flags().print_on(tty);
242 if (!m->is_abstract()) {
243 if (!m->is_private()) {
244 tty->print("default");
245 }
246 else {
247 tty->print("private-intf");
248 }
249 }
250 tty->cr();
251 }
252 break;
253
254 case CallInfo::vtable_call:
255 vmindex = info.vtable_index();
256 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
257 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
258 if (m_klass->is_interface()) {
259 // This is a vtable call to an interface method (abstract "miranda method" or default method).
260 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
261 // (LinkResolver should help us figure this out.)
262 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass");
263 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass());
264 if (m_klass_non_interface->is_interface()) {
265 m_klass_non_interface = SystemDictionary::Object_klass();
266 #ifdef ASSERT
267 { ResourceMark rm;
268 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
269 assert(m->name() == m2->name() && m->signature() == m2->signature(),
270 "at %d, %s != %s", vmindex,
271 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
272 }
273 #endif //ASSERT
274 }
275 if (!m->is_public()) {
276 assert(m->is_public(), "virtual call must be to public interface method");
277 return NULL; // elicit an error later in product build
278 }
279 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
280 m_klass = m_klass_non_interface;
281 }
282 if (TraceInvokeDynamic) {
283 ttyLocker ttyl;
284 ResourceMark rm;
285 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
286 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
287 m_klass->internal_name(), vmindex);
288 m->access_flags().print_on(tty);
289 if (m->is_default_method()) {
290 tty->print("default");
291 }
292 tty->cr();
293 }
294 break;
295
296 case CallInfo::direct_call:
297 vmindex = Method::nonvirtual_vtable_index;
298 if (m->is_static()) {
299 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
300 } else if (m->is_object_constructor()) {
301 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
302 } else {
303 // "special" reflects that this is a direct call, not that it
304 // necessarily originates from an invokespecial. We can also do
305 // direct calls for private and/or final non-static methods.
306 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
307 }
308 break;
309
310 default: assert(false, "bad CallInfo"); return NULL;
311 }
312
313 // @CallerSensitive annotation detected
314 if (m->caller_sensitive()) {
315 flags |= CALLER_SENSITIVE;
316 }
317
318 Handle resolved_method = info.resolved_method_name();
319 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(),
320 "Should not change after link resolution");
321
322 oop mname_oop = mname();
323 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
324 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
325 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
326 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
327 // Note: name and type can be lazily computed by resolve_MemberName,
328 // if Java code needs them as resolved String and MethodType objects.
329 // If relevant, the vtable or itable value is stored as vmindex.
330 // This is done eagerly, since it is readily available without
331 // constructing any new objects.
332 return mname();
333 }
334
335 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
336 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
337 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
338 if (fd.is_flattenable()) {
339 flags |= JVM_ACC_FIELD_FLATTENABLE;
340 }
341 if (fd.is_flattened()) {
342 flags |= JVM_ACC_FIELD_FLATTENED;
343 }
344 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
345 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
346
347 oop mname_oop = mname();
348 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
349 java_lang_invoke_MemberName::set_method (mname_oop, NULL);
350 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
351 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror());
352
353 oop type = field_signature_type_or_null(fd.signature());
354 oop name = field_name_or_null(fd.name());
355 if (name != NULL)
356 java_lang_invoke_MemberName::set_name(mname_oop, name);
357 if (type != NULL)
358 java_lang_invoke_MemberName::set_type(mname_oop, type);
359 // Note: name and type can be lazily computed by resolve_MemberName,
360 // if Java code needs them as resolved String and Class objects.
361 // Note that the incoming type oop might be pre-resolved (non-null).
362 // The base clazz and field offset (vmindex) must be eagerly stored,
363 // because they unambiguously identify the field.
364 // Although the fieldDescriptor::_index would also identify the field,
365 // we do not use it, because it is harder to decode.
366 // TO DO: maybe intern mname_oop
367 return mname();
368 }
369
370 // JVM 2.9 Special Methods:
371 // A method is signature polymorphic if and only if all of the following conditions hold :
372 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
373 // * It has a single formal parameter of type Object[].
374 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
375 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
376 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
377 if (klass == NULL)
378 return false;
379 // The following test will fail spuriously during bootstrap of MethodHandle itself:
380 // if (klass != SystemDictionary::MethodHandle_klass())
381 // Test the name instead:
382 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
383 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
384 return false;
385 }
386
387 // Look up signature polymorphic method with polymorphic return type
388 Symbol* poly_sig = vmSymbols::object_array_object_signature();
389 InstanceKlass* iklass = InstanceKlass::cast(klass);
390 Method* m = iklass->find_method(name, poly_sig);
391 if (m != NULL) {
392 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
393 int flags = m->access_flags().as_int();
394 if ((flags & required) == required) {
395 return true;
396 }
397 }
398
399 // Look up signature polymorphic method with non-polymorphic (non Object) return type
400 int me;
401 int ms = iklass->find_method_by_name(name, &me);
402 if (ms == -1) return false;
403 for (; ms < me; ms++) {
404 Method* m = iklass->methods()->at(ms);
405 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
406 int flags = m->access_flags().as_int();
407 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
408 return true;
409 }
410 }
411 return false;
412 }
413
414
415 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
416 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
417 switch (iid) {
418 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
419 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
420 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
421 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
422 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
423 default:
424 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
425 return 0;
426 }
427 }
428
429 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
430 switch(id) {
431 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
432 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
433 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
434 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
435 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
436 default:
437 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
438 return Bytecodes::_illegal;
439 }
440 }
441
442 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
443 switch (iid) {
444 case vmIntrinsics::_invokeBasic: return 0;
445 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
446 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
447 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
448 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
449 default:
450 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
451 return 0;
452 }
453 }
454
455 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
456 vmSymbols::SID name_id = vmSymbols::find_sid(name);
457 switch (name_id) {
458 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
459 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
460 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
461 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
462
463 // There is one static signature-polymorphic method for each JVM invocation mode.
464 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
465 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
466 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
467 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
468 default: break;
469 }
470
471 // Cover the case of invokeExact and any future variants of invokeFoo.
472 Klass* mh_klass = SystemDictionary::well_known_klass(
473 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
474 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
475 return vmIntrinsics::_invokeGeneric;
476 }
477
478 // Cover the case of methods on VarHandle.
479 Klass* vh_klass = SystemDictionary::well_known_klass(
480 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) );
481 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
482 return vmIntrinsics::_invokeGeneric;
483 }
484
485 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
486 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
487 return vmIntrinsics::_none;
488 }
489
490 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
491 if (klass != NULL &&
492 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
493 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
494 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
495 if (iid != vmIntrinsics::_none)
496 return iid;
497 if (is_method_handle_invoke_name(klass, name))
498 return vmIntrinsics::_invokeGeneric;
499 }
500 return vmIntrinsics::_none;
501 }
502
503 // Returns true if method is signature polymorphic and public
504 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
505 if (is_signature_polymorphic_name(klass, name)) {
506 InstanceKlass* iklass = InstanceKlass::cast(klass);
507 int me;
508 int ms = iklass->find_method_by_name(name, &me);
509 assert(ms != -1, "");
510 for (; ms < me; ms++) {
511 Method* m = iklass->methods()->at(ms);
512 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
513 int flags = m->access_flags().as_int();
514 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
515 return true;
516 }
517 }
518 }
519 return false;
520 }
521
522 // convert the external string or reflective type to an internal signature
523 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
524 if (java_lang_invoke_MethodType::is_instance(type_str)) {
525 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
526 } else if (java_lang_Class::is_instance(type_str)) {
527 return java_lang_Class::as_signature(type_str, false, THREAD);
528 } else if (java_lang_String::is_instance_inlined(type_str)) {
529 if (intern_if_not_found) {
530 return java_lang_String::as_symbol(type_str, THREAD);
531 } else {
532 return java_lang_String::as_symbol_or_null(type_str);
533 }
534 } else {
535 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
536 }
537 }
538
539 static const char OBJ_SIG[] = "Ljava/lang/Object;";
540 enum { OBJ_SIG_LEN = 18 };
541
542 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
543 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
544 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
545 const int len = sig->utf8_length();
546 for (int i = 0; i < len; i++) {
547 switch (sig->char_at(i)) {
548 case 'L':
549 // only java/lang/Object is valid here
550 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
551 return false;
552 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
553 continue;
554 case '(': case ')': case 'V':
555 case 'I': case 'J': case 'F': case 'D':
556 continue;
557 //case '[':
558 //case 'Z': case 'B': case 'C': case 'S':
559 default:
560 return false;
561 }
562 }
563 return true;
564 }
565
566 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
567 Symbol* bsig = NULL;
568 if (sig == NULL) {
569 return sig;
570 } else if (is_basic_type_signature(sig)) {
571 sig->increment_refcount();
572 return sig; // that was easy
573 } else if (sig->char_at(0) != '(') {
574 BasicType bt = char2type(sig->char_at(0));
575 if (is_subword_type(bt)) {
576 bsig = vmSymbols::int_signature();
577 } else {
578 assert(bt == T_OBJECT || bt == T_ARRAY || bt == T_VALUETYPE, "is_basic_type_signature was false");
579 bsig = vmSymbols::object_signature();
580 }
581 } else {
582 ResourceMark rm;
583 stringStream buffer(128);
584 buffer.put('(');
585 int arg_pos = 0, keep_arg_pos = -1;
586 if (keep_last_arg)
587 keep_arg_pos = ArgumentCount(sig).size() - 1;
588 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
589 BasicType bt = ss.type();
590 size_t this_arg_pos = buffer.size();
591 if (ss.at_return_type()) {
592 buffer.put(')');
593 }
594 if (arg_pos == keep_arg_pos) {
595 buffer.write((char*) ss.raw_bytes(),
596 (int) ss.raw_length());
597 } else if (bt == T_OBJECT || bt == T_ARRAY || bt == T_VALUETYPE) {
598 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
599 } else {
600 if (is_subword_type(bt))
601 bt = T_INT;
602 buffer.put(type2char(bt));
603 }
604 arg_pos++;
605 }
606 const char* sigstr = buffer.base();
607 int siglen = (int) buffer.size();
608 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
609 }
610 assert(is_basic_type_signature(bsig) ||
611 // detune assert in case the injected argument is not a basic type:
612 keep_last_arg, "");
613 return bsig;
614 }
615
616 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
617 Symbol* sig,
618 bool keep_arrays,
619 bool keep_basic_names) {
620 st = st ? st : tty;
621 int len = sig->utf8_length();
622 int array = 0;
623 bool prev_type = false;
624 for (int i = 0; i < len; i++) {
625 char ch = sig->char_at(i);
626 switch (ch) {
627 case '(': case ')':
628 prev_type = false;
629 st->put(ch);
630 continue;
631 case '[':
632 if (!keep_basic_names && keep_arrays)
633 st->put(ch);
634 array++;
635 continue;
636 case 'L':
637 {
638 if (prev_type) st->put(',');
639 int start = i+1, slash = start;
640 while (++i < len && (ch = sig->char_at(i)) != ';') {
641 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
642 }
643 if (slash < i) start = slash;
644 if (!keep_basic_names) {
645 st->put('L');
646 } else {
647 for (int j = start; j < i; j++)
648 st->put(sig->char_at(j));
649 prev_type = true;
650 }
651 break;
652 }
653 default:
654 {
655 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
656 ch = '[';
657 array = 0;
658 }
659 if (prev_type) st->put(',');
660 const char* n = NULL;
661 if (keep_basic_names)
662 n = type2name(char2type(ch));
663 if (n == NULL) {
664 // unknown letter, or we don't want to know its name
665 st->put(ch);
666 } else {
667 st->print("%s", n);
668 prev_type = true;
669 }
670 break;
671 }
672 }
673 // Switch break goes here to take care of array suffix:
674 if (prev_type) {
675 while (array > 0) {
676 st->print("[]");
677 --array;
678 }
679 }
680 array = 0;
681 }
682 }
683
684
685
686 static oop object_java_mirror() {
687 return SystemDictionary::Object_klass()->java_mirror();
688 }
689
690 oop MethodHandles::field_name_or_null(Symbol* s) {
691 if (s == NULL) return NULL;
692 return StringTable::lookup(s);
693 }
694
695 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
696 if (s == NULL) return NULL;
697 BasicType bt = FieldType::basic_type(s);
698 if (is_java_primitive(bt)) {
699 assert(s->utf8_length() == 1, "");
700 return java_lang_Class::primitive_mirror(bt);
701 }
702 // Here are some more short cuts for common types.
703 // They are optional, since reference types can be resolved lazily.
704 if (bt == T_OBJECT) {
705 if (s == vmSymbols::object_signature()) {
706 return object_java_mirror();
707 } else if (s == vmSymbols::class_signature()) {
708 return SystemDictionary::Class_klass()->java_mirror();
709 } else if (s == vmSymbols::string_signature()) {
710 return SystemDictionary::String_klass()->java_mirror();
711 }
712 }
713 return NULL;
714 }
715
716
717 // An unresolved member name is a mere symbolic reference.
718 // Resolving it plants a vmtarget/vmindex in it,
719 // which refers directly to JVM internals.
720 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller,
721 bool speculative_resolve, TRAPS) {
722 Handle empty;
723 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
724
725 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
726 // Already resolved.
727 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
728 assert(vmindex >= Method::nonvirtual_vtable_index, "");
729 return mname;
730 }
731
732 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
733 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
734 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
735 int flags = java_lang_invoke_MemberName::flags(mname());
736 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
737 if (!ref_kind_is_valid(ref_kind)) {
738 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
739 }
740
741 DEBUG_ONLY(int old_vmindex);
742 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
743
744 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
745 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
746 }
747
748 InstanceKlass* defc = NULL;
749 {
750 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
751 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
752 if (!defc_klass->is_instance_klass()) {
753 if (!defc_klass->is_array_klass()) return empty;
754 defc_klass = SystemDictionary::Object_klass();
755 }
756 defc = InstanceKlass::cast(defc_klass);
757 }
758 if (defc == NULL) {
759 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
760 }
761 defc->link_class(CHECK_(empty)); // possible safepoint
762
763 // convert the external string name to an internal symbol
764 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
765 if (name == NULL) return empty; // no such name
766 if (name == vmSymbols::class_initializer_name())
767 return empty; // illegal name
768
769 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
770 if ((flags & ALL_KINDS) == IS_METHOD &&
771 (defc == SystemDictionary::MethodHandle_klass() || defc == SystemDictionary::VarHandle_klass()) &&
772 (ref_kind == JVM_REF_invokeVirtual ||
773 ref_kind == JVM_REF_invokeSpecial ||
774 // static invocation mode is required for _linkToVirtual, etc.:
775 ref_kind == JVM_REF_invokeStatic)) {
776 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
777 if (iid != vmIntrinsics::_none &&
778 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
779 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
780 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
781 mh_invoke_id = iid;
782 }
783 }
784
785 // convert the external string or reflective type to an internal signature
786 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
787 if (type == NULL) return empty; // no such signature exists in the VM
788
789 LinkInfo::AccessCheck access_check = caller != NULL ?
790 LinkInfo::needs_access_check :
791 LinkInfo::skip_access_check;
792
793 // Time to do the lookup.
794 switch (flags & ALL_KINDS) {
795 case IS_METHOD:
796 {
797 CallInfo result;
798 LinkInfo link_info(defc, name, type, caller, access_check);
799 {
800 assert(!HAS_PENDING_EXCEPTION, "");
801 if (ref_kind == JVM_REF_invokeStatic) {
802 LinkResolver::resolve_static_call(result,
803 link_info, false, THREAD);
804 } else if (ref_kind == JVM_REF_invokeInterface) {
805 LinkResolver::resolve_interface_call(result, Handle(), defc,
806 link_info, false, THREAD);
807 } else if (mh_invoke_id != vmIntrinsics::_none) {
808 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
809 LinkResolver::resolve_handle_call(result, link_info, THREAD);
810 } else if (ref_kind == JVM_REF_invokeSpecial) {
811 LinkResolver::resolve_special_call(result, Handle(),
812 link_info, THREAD);
813 } else if (ref_kind == JVM_REF_invokeVirtual) {
814 LinkResolver::resolve_virtual_call(result, Handle(), defc,
815 link_info, false, THREAD);
816 } else {
817 assert(false, "ref_kind=%d", ref_kind);
818 }
819 if (HAS_PENDING_EXCEPTION) {
820 if (speculative_resolve) {
821 CLEAR_PENDING_EXCEPTION;
822 }
823 return empty;
824 }
825 }
826 if (result.resolved_appendix().not_null()) {
827 // The resolved MemberName must not be accompanied by an appendix argument,
828 // since there is no way to bind this value into the MemberName.
829 // Caller is responsible to prevent this from happening.
830 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
831 }
832 result.set_resolved_method_name(CHECK_(empty));
833 oop mname2 = init_method_MemberName(mname, result);
834 return Handle(THREAD, mname2);
835 }
836 case IS_CONSTRUCTOR:
837 {
838 CallInfo result;
839 LinkInfo link_info(defc, name, type, caller, access_check);
840 {
841 assert(!HAS_PENDING_EXCEPTION, "");
842 if (name != vmSymbols::object_initializer_name()) {
843 break; // will throw after end of switch
844 } else if (type->is_void_method_signature()) {
845 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
846 } else {
847 // LinkageError unless it returns something reasonable
848 LinkResolver::resolve_static_call(result, link_info, false, THREAD);
849 }
850 if (HAS_PENDING_EXCEPTION) {
851 if (speculative_resolve) {
852 CLEAR_PENDING_EXCEPTION;
853 }
854 return empty;
855 }
856 }
857 assert(result.is_statically_bound(), "");
858 result.set_resolved_method_name(CHECK_(empty));
859 oop mname2 = init_method_MemberName(mname, result);
860 return Handle(THREAD, mname2);
861 }
862 case IS_FIELD:
863 {
864 fieldDescriptor result; // find_field initializes fd if found
865 {
866 assert(!HAS_PENDING_EXCEPTION, "");
867 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
868 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
869 if (HAS_PENDING_EXCEPTION) {
870 if (speculative_resolve) {
871 CLEAR_PENDING_EXCEPTION;
872 }
873 return empty;
874 }
875 }
876 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
877 return Handle(THREAD, mname2);
878 }
879 default:
880 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
881 }
882
883 return empty;
884 }
885
886 // Conversely, a member name which is only initialized from JVM internals
887 // may have null defc, name, and type fields.
888 // Resolving it plants a vmtarget/vmindex in it,
889 // which refers directly to JVM internals.
890 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
891 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
892
893 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
894 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
895 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
896 int flags = java_lang_invoke_MemberName::flags(mname());
897
898 if (suppress != 0) {
899 if (suppress & _suppress_defc) have_defc = true;
900 if (suppress & _suppress_name) have_name = true;
901 if (suppress & _suppress_type) have_type = true;
902 }
903
904 if (have_defc && have_name && have_type) return; // nothing needed
905
906 switch (flags & ALL_KINDS) {
907 case IS_METHOD:
908 case IS_CONSTRUCTOR:
909 {
910 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
911 if (vmtarget == NULL) {
912 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
913 }
914 methodHandle m(THREAD, vmtarget);
915 DEBUG_ONLY(vmtarget = NULL); // safety
916 if (!have_defc) {
917 InstanceKlass* defc = m->method_holder();
918 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
919 }
920 if (!have_name) {
921 //not java_lang_String::create_from_symbol; let's intern member names
922 oop name = StringTable::intern(m->name(), CHECK);
923 java_lang_invoke_MemberName::set_name(mname(), name);
924 }
925 if (!have_type) {
926 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
927 java_lang_invoke_MemberName::set_type(mname(), type());
928 }
929 return;
930 }
931 case IS_FIELD:
932 {
933 oop clazz = java_lang_invoke_MemberName::clazz(mname());
934 if (clazz == NULL) {
935 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
936 }
937 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
938 DEBUG_ONLY(clazz = NULL); // safety
939 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
940 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
941 fieldDescriptor fd; // find_field initializes fd if found
942 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
943 break; // cannot expand
944 if (!have_name) {
945 //not java_lang_String::create_from_symbol; let's intern member names
946 oop name = StringTable::intern(fd.name(), CHECK);
947 java_lang_invoke_MemberName::set_name(mname(), name);
948 }
949 if (!have_type) {
950 // If it is a primitive field type, don't mess with short strings like "I".
951 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
952 if (type.is_null()) {
953 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
954 }
955 java_lang_invoke_MemberName::set_type(mname(), type());
956 }
957 return;
958 }
959 }
960 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
961 }
962
963 int MethodHandles::find_MemberNames(Klass* k,
964 Symbol* name, Symbol* sig,
965 int mflags, Klass* caller,
966 int skip, objArrayHandle results, TRAPS) {
967 // %%% take caller into account!
968
969 Thread* thread = Thread::current();
970
971 if (k == NULL || !k->is_instance_klass()) return -1;
972
973 int rfill = 0, rlimit = results->length(), rskip = skip;
974 // overflow measurement:
975 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
976
977 int match_flags = mflags;
978 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
979 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
980 bool local_only = !(search_superc | search_intfc);
981
982 if (name != NULL) {
983 if (name->utf8_length() == 0) return 0; // a match is not possible
984 }
985 if (sig != NULL) {
986 if (sig->utf8_length() == 0) return 0; // a match is not possible
987 if (sig->char_at(0) == '(')
988 match_flags &= ~(IS_FIELD | IS_TYPE);
989 else
990 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
991 }
992
993 if ((match_flags & IS_TYPE) != 0) {
994 // NYI, and Core Reflection works quite well for this query
995 }
996
997 if ((match_flags & IS_FIELD) != 0) {
998 InstanceKlass* ik = InstanceKlass::cast(k);
999 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
1000 if (name != NULL && st.name() != name)
1001 continue;
1002 if (sig != NULL && st.signature() != sig)
1003 continue;
1004 // passed the filters
1005 if (rskip > 0) {
1006 --rskip;
1007 } else if (rfill < rlimit) {
1008 Handle result(thread, results->obj_at(rfill++));
1009 if (!java_lang_invoke_MemberName::is_instance(result()))
1010 return -99; // caller bug!
1011 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
1012 if (!oopDesc::equals(saved, result()))
1013 results->obj_at_put(rfill-1, saved); // show saved instance to user
1014 } else if (++overflow >= overflow_limit) {
1015 match_flags = 0; break; // got tired of looking at overflow
1016 }
1017 }
1018 }
1019
1020 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
1021 // watch out for these guys:
1022 Symbol* init_name = vmSymbols::object_initializer_name();
1023 Symbol* clinit_name = vmSymbols::class_initializer_name();
1024 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
1025 bool ctor_ok = true, sfac_ok = true;
1026 // fix name so that it captures the intention of IS_CONSTRUCTOR
1027 if (!(match_flags & IS_METHOD)) {
1028 // constructors only
1029 if (name == NULL) {
1030 name = init_name;
1031 } else if (name != init_name) {
1032 return 0; // no constructors of this method name
1033 }
1034 sfac_ok = false;
1035 } else if (!(match_flags & IS_CONSTRUCTOR)) {
1036 // methods only
1037 ctor_ok = false; // but sfac_ok is true, so we might find <init>
1038 } else {
1039 // caller will accept either sort; no need to adjust name
1040 }
1041 InstanceKlass* ik = InstanceKlass::cast(k);
1042 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
1043 Method* m = st.method();
1044 Symbol* m_name = m->name();
1045 if (m_name == clinit_name)
1046 continue;
1047 if (name != NULL && m_name != name)
1048 continue;
1049 if (sig != NULL && m->signature() != sig)
1050 continue;
1051 if (m_name == init_name) { // might be either ctor or sfac
1052 if (m->is_object_constructor() && !ctor_ok) continue;
1053 if (m->is_static_init_factory() && !sfac_ok) continue;
1054 }
1055 // passed the filters
1056 if (rskip > 0) {
1057 --rskip;
1058 } else if (rfill < rlimit) {
1059 Handle result(thread, results->obj_at(rfill++));
1060 if (!java_lang_invoke_MemberName::is_instance(result()))
1061 return -99; // caller bug!
1062 CallInfo info(m, NULL, CHECK_0);
1063 oop saved = MethodHandles::init_method_MemberName(result, info);
1064 if (!oopDesc::equals(saved, result()))
1065 results->obj_at_put(rfill-1, saved); // show saved instance to user
1066 } else if (++overflow >= overflow_limit) {
1067 match_flags = 0; break; // got tired of looking at overflow
1068 }
1069 }
1070 }
1071
1072 // return number of elements we at leasted wanted to initialize
1073 return rfill + overflow;
1074 }
1075
1076 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
1077 assert_locked_or_safepoint(CodeCache_lock);
1078
1079 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1080 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1081 // Try to purge stale entries on updates.
1082 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
1083 // in order to avoid memory leak, stale entries are purged whenever a dependency list
1084 // is changed (both on addition and removal). Though memory reclamation is delayed,
1085 // it avoids indefinite memory usage growth.
1086 deps.add_dependent_nmethod(nm);
1087 }
1088
1089 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
1090 assert_locked_or_safepoint(CodeCache_lock);
1091
1092 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1093 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1094 deps.remove_dependent_nmethod(nm);
1095 }
1096
1097 void MethodHandles::clean_dependency_context(oop call_site) {
1098 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1099 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1100 deps.clean_unloading_dependents();
1101 }
1102
1103 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
1104 assert_lock_strong(Compile_lock);
1105
1106 int marked = 0;
1107 CallSiteDepChange changes(call_site, target);
1108 {
1109 NoSafepointVerifier nsv;
1110 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1111
1112 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site());
1113 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1114 marked = deps.mark_dependent_nmethods(changes);
1115 }
1116 if (marked > 0) {
1117 // At least one nmethod has been marked for deoptimization.
1118 VM_Deoptimize op;
1119 VMThread::execute(&op);
1120 }
1121 }
1122
1123 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
1124 if (TraceMethodHandles) {
1125 const char* name = vmIntrinsics::name_at(iid);
1126 if (*name == '_') name += 1;
1127 const size_t len = strlen(name) + 50;
1128 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
1129 const char* suffix = "";
1130 if (is_signature_polymorphic(iid)) {
1131 if (is_signature_polymorphic_static(iid))
1132 suffix = "/static";
1133 else
1134 suffix = "/private";
1135 }
1136 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
1137 trace_method_handle(_masm, qname);
1138 // Note: Don't free the allocated char array because it's used
1139 // during runtime.
1140 }
1141 }
1142
1143 //
1144 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1145 // They are the private interface between this JVM and the HotSpot-specific
1146 // Java code that implements JSR 292 method handles.
1147 //
1148 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1149 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1150 //
1151
1152 #ifndef PRODUCT
1153 #define EACH_NAMED_CON(template, requirement) \
1154 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1155 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1156 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1157 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1158 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1159 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1160 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1161 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1162 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1163 /*end*/
1164
1165 #define IGNORE_REQ(req_expr) /* req_expr */
1166 #define ONE_PLUS(scope,value) 1+
1167 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1168 #define VALUE_COMMA(scope,value) scope::value,
1169 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1170 #define STRING_NULL(scope,value) #value "\0"
1171 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1172
1173 static bool advertise_con_value(int which) {
1174 if (which < 0) return false;
1175 bool ok = true;
1176 int count = 0;
1177 #define INC_COUNT(scope,value) \
1178 ++count;
1179 #define CHECK_REQ(req_expr) \
1180 if (which < count) return ok; \
1181 ok = (req_expr);
1182 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1183 #undef INC_COUNT
1184 #undef CHECK_REQ
1185 assert(count == con_value_count, "");
1186 if (which < count) return ok;
1187 return false;
1188 }
1189
1190 #undef ONE_PLUS
1191 #undef VALUE_COMMA
1192 #undef STRING_NULL
1193 #undef EACH_NAMED_CON
1194 #endif // PRODUCT
1195
1196 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1197 #ifndef PRODUCT
1198 if (advertise_con_value(which)) {
1199 assert(which >= 0 && which < con_value_count, "");
1200 int con = con_values[which];
1201 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1202 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1203 const char* str = &con_names[0];
1204 for (int i = 0; i < which; i++)
1205 str += strlen(str) + 1; // skip name and null
1206 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1207 box->obj_at_put(0, name);
1208 }
1209 return con;
1210 }
1211 #endif
1212 return 0;
1213 }
1214 JVM_END
1215
1216 // void init(MemberName self, AccessibleObject ref)
1217 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1218 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1219 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1220 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1221 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1222 MethodHandles::init_MemberName(mname, target, CHECK);
1223 }
1224 JVM_END
1225
1226 // void expand(MemberName self)
1227 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1228 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1229 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1230 MethodHandles::expand_MemberName(mname, 0, CHECK);
1231 }
1232 JVM_END
1233
1234 // void resolve(MemberName self, Class<?> caller)
1235 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1236 jboolean speculative_resolve)) {
1237 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1238 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1239
1240 // The trusted Java code that calls this method should already have performed
1241 // access checks on behalf of the given caller. But, we can verify this.
1242 if (VerifyMethodHandles && caller_jh != NULL &&
1243 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1244 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1245 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1246 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1247 }
1248
1249 // Reflection::verify_class_access can only handle instance classes.
1250 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1251 // Emulate LinkResolver::check_klass_accessability.
1252 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1253 if (caller != SystemDictionary::Object_klass()
1254 && Reflection::verify_class_access(caller,
1255 InstanceKlass::cast(reference_klass),
1256 true) != Reflection::ACCESS_OK) {
1257 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1258 }
1259 }
1260 }
1261
1262 Klass* caller = caller_jh == NULL ? NULL :
1263 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1264 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, speculative_resolve == JNI_TRUE,
1265 CHECK_NULL);
1266
1267 if (resolved.is_null()) {
1268 int flags = java_lang_invoke_MemberName::flags(mname());
1269 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1270 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1271 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1272 }
1273 if (speculative_resolve) {
1274 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1275 return NULL;
1276 }
1277 if ((flags & ALL_KINDS) == IS_FIELD) {
1278 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1279 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1280 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1281 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1282 } else {
1283 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1284 }
1285 }
1286
1287 return JNIHandles::make_local(THREAD, resolved());
1288 }
1289 JVM_END
1290
1291 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1292 if (mname == NULL ||
1293 java_lang_invoke_MemberName::clazz(mname) == NULL) {
1294 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1295 } else {
1296 int flags = java_lang_invoke_MemberName::flags(mname);
1297 if ((flags & IS_FIELD) != 0 &&
1298 (must_be_static
1299 ? (flags & JVM_ACC_STATIC) != 0
1300 : (flags & JVM_ACC_STATIC) == 0)) {
1301 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1302 return (jlong) vmindex;
1303 }
1304 }
1305 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1306 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1307 return 0;
1308 }
1309
1310 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1311 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1312 }
1313 JVM_END
1314
1315 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1316 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1317 }
1318 JVM_END
1319
1320 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1321 // use the other function to perform sanity checks:
1322 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1323 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1324 return JNIHandles::make_local(THREAD, clazz);
1325 }
1326 JVM_END
1327
1328 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1329 if (mname_jh == NULL) return NULL;
1330 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1331 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1332 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1333 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1334 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1335 result->obj_at_put(0, x);
1336
1337 int flags = java_lang_invoke_MemberName::flags(mname());
1338 if ((flags & IS_FIELD) != 0) {
1339 x = java_lang_invoke_MemberName::clazz(mname());
1340 } else {
1341 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1342 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1343 x = mname();
1344 }
1345 result->obj_at_put(1, x);
1346 return JNIHandles::make_local(env, result());
1347 }
1348 JVM_END
1349
1350
1351
1352 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1353 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1354 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1355 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1356 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1357 if (clazz_jh == NULL || results_jh == NULL) return -1;
1358 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1359
1360 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1361 if (results.is_null() || !results->is_objArray()) return -1;
1362
1363 TempNewSymbol name = NULL;
1364 TempNewSymbol sig = NULL;
1365 if (name_jh != NULL) {
1366 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1367 if (name == NULL) return 0; // a match is not possible
1368 }
1369 if (sig_jh != NULL) {
1370 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1371 if (sig == NULL) return 0; // a match is not possible
1372 }
1373
1374 Klass* caller = NULL;
1375 if (caller_jh != NULL) {
1376 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1377 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1378 caller = java_lang_Class::as_Klass(caller_oop);
1379 }
1380
1381 if (name != NULL && sig != NULL && results.not_null()) {
1382 // try a direct resolve
1383 // %%% TO DO
1384 }
1385
1386 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1387 caller, skip, results, CHECK_0);
1388 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1389 return res;
1390 }
1391 JVM_END
1392
1393 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1394 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1395 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1396 {
1397 // Walk all nmethods depending on this call site.
1398 MutexLocker mu(Compile_lock, thread);
1399 MethodHandles::flush_dependent_nmethods(call_site, target);
1400 java_lang_invoke_CallSite::set_target(call_site(), target());
1401 }
1402 }
1403 JVM_END
1404
1405 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1406 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1407 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1408 {
1409 // Walk all nmethods depending on this call site.
1410 MutexLocker mu(Compile_lock, thread);
1411 MethodHandles::flush_dependent_nmethods(call_site, target);
1412 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1413 }
1414 }
1415 JVM_END
1416
1417 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1418 jobject caller_jh, jintArray index_info_jh,
1419 jint start, jint end,
1420 jobjectArray buf_jh, jint pos,
1421 jboolean resolve, jobject ifna_jh)) {
1422 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1423 if (caller_k == NULL || !caller_k->is_instance_klass()) {
1424 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1425 }
1426 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1427 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1428 if (index_info_oop == NULL ||
1429 index_info_oop->klass() != Universe::intArrayKlassObj() ||
1430 typeArrayOop(index_info_oop)->length() < 2) {
1431 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1432 }
1433 typeArrayHandle index_info(THREAD, index_info_oop);
1434 int bss_index_in_pool = index_info->int_at(1);
1435 // While we are here, take a quick look at the index info:
1436 if (bss_index_in_pool <= 0 ||
1437 bss_index_in_pool >= caller->constants()->length() ||
1438 index_info->int_at(0)
1439 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1440 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1441 }
1442 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1443 if (start < 0) {
1444 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1445 if (start == pseudo_index) {
1446 if (start >= end || 0 > pos || pos >= buf->length()) break;
1447 oop pseudo_arg = NULL;
1448 switch (pseudo_index) {
1449 case -4: // bootstrap method
1450 {
1451 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool);
1452 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1453 break;
1454 }
1455 case -3: // name
1456 {
1457 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool);
1458 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1459 pseudo_arg = str();
1460 break;
1461 }
1462 case -2: // type
1463 {
1464 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool);
1465 Handle th;
1466 if (type->char_at(0) == '(') {
1467 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1468 } else {
1469 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1470 }
1471 pseudo_arg = th();
1472 break;
1473 }
1474 case -1: // argument count
1475 {
1476 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool);
1477 jvalue argc_value; argc_value.i = (jint)argc;
1478 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1479 break;
1480 }
1481 }
1482
1483 // Store the pseudo-argument, and advance the pointers.
1484 buf->obj_at_put(pos++, pseudo_arg);
1485 ++start;
1486 }
1487 }
1488 // When we are done with this there may be regular arguments to process too.
1489 }
1490 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1491 caller->constants()->
1492 copy_bootstrap_arguments_at(bss_index_in_pool,
1493 start, end, buf, pos,
1494 (resolve == JNI_TRUE), ifna, CHECK);
1495 }
1496 JVM_END
1497
1498 // It is called by a Cleaner object which ensures that dropped CallSites properly
1499 // deallocate their dependency information.
1500 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1501 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1502 {
1503 // Walk all nmethods depending on this call site.
1504 MutexLocker mu1(Compile_lock, thread);
1505
1506 int marked = 0;
1507 {
1508 NoSafepointVerifier nsv;
1509 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1510 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1511 marked = deps.remove_all_dependents();
1512 }
1513 if (marked > 0) {
1514 // At least one nmethod has been marked for deoptimization
1515 VM_Deoptimize op;
1516 VMThread::execute(&op);
1517 }
1518 }
1519 }
1520 JVM_END
1521
1522 /**
1523 * Throws a java/lang/UnsupportedOperationException unconditionally.
1524 * This is required by the specification of MethodHandle.invoke if
1525 * invoked directly.
1526 */
1527 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1528 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1529 return NULL;
1530 }
1531 JVM_END
1532
1533 /**
1534 * Throws a java/lang/UnsupportedOperationException unconditionally.
1535 * This is required by the specification of MethodHandle.invokeExact if
1536 * invoked directly.
1537 */
1538 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1539 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1540 return NULL;
1541 }
1542 JVM_END
1543
1544 /// JVM_RegisterMethodHandleMethods
1545
1546 #undef CS // Solaris builds complain
1547
1548 #define LANG "Ljava/lang/"
1549 #define JLINV "Ljava/lang/invoke/"
1550
1551 #define OBJ LANG "Object;"
1552 #define CLS LANG "Class;"
1553 #define STRG LANG "String;"
1554 #define CS JLINV "CallSite;"
1555 #define MT JLINV "MethodType;"
1556 #define MH JLINV "MethodHandle;"
1557 #define MEM JLINV "MemberName;"
1558 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1559
1560 #define CC (char*) /*cast a literal from (const char*)*/
1561 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1562
1563 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1564 static JNINativeMethod MHN_methods[] = {
1565 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1566 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1567 {CC "resolve", CC "(" MEM "" CLS "Z)" MEM, FN_PTR(MHN_resolve_Mem)},
1568 // static native int getNamedCon(int which, Object[] name)
1569 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1570 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1571 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1572 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1573 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1574 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1575 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1576 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1577 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1578 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1579 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1580 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1581 };
1582
1583 static JNINativeMethod MH_methods[] = {
1584 // UnsupportedOperationException throwers
1585 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1586 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1587 };
1588
1589 /**
1590 * This one function is exported, used by NativeLookup.
1591 */
1592 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1593 assert(!MethodHandles::enabled(), "must not be enabled");
1594 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1595
1596 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1597 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1598
1599 {
1600 ThreadToNativeFromVM ttnfv(thread);
1601
1602 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1603 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1604 "register java.lang.invoke.MethodHandleNative natives");
1605
1606 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1607 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1608 "register java.lang.invoke.MethodHandle natives");
1609 }
1610
1611 if (TraceInvokeDynamic) {
1612 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1613 }
1614
1615 MethodHandles::set_enabled(true);
1616 }
1617 JVM_END