1 /*
2 * Copyright (c) 2008, 2017, 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 "prims/methodHandles.hpp"
40 #include "runtime/compilationPolicy.hpp"
41 #include "runtime/javaCalls.hpp"
42 #include "runtime/timerTrace.hpp"
43 #include "runtime/reflection.hpp"
44 #include "runtime/signature.hpp"
45 #include "runtime/stubRoutines.hpp"
46 #include "utilities/exceptions.hpp"
47
48
49 /*
50 * JSR 292 reference implementation: method handles
51 * The JDK 7 reference implementation represented method handle
52 * combinations as chains. Each link in the chain had a "vmentry"
53 * field which pointed at a bit of assembly code which performed
54 * one transformation before dispatching to the next link in the chain.
55 *
56 * The current reference implementation pushes almost all code generation
57 * responsibility to (trusted) Java code. A method handle contains a
58 * pointer to its "LambdaForm", which embodies all details of the method
59 * handle's behavior. The LambdaForm is a normal Java object, managed
60 * by a runtime coded in Java.
61 */
62
63 bool MethodHandles::_enabled = false; // set true after successful native linkage
64 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
65
66 /**
67 * Generates method handle adapters. Returns 'false' if memory allocation
68 * failed and true otherwise.
69 */
70 void MethodHandles::generate_adapters() {
71 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
72 assert(_adapter_code == NULL, "generate only once");
73
74 ResourceMark rm;
75 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
76 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
77 CodeBuffer code(_adapter_code);
78 MethodHandlesAdapterGenerator g(&code);
79 g.generate();
80 code.log_section_sizes("MethodHandlesAdapterBlob");
81 }
82
83 //------------------------------------------------------------------------------
84 // MethodHandlesAdapterGenerator::generate
85 //
86 void MethodHandlesAdapterGenerator::generate() {
87 // Generate generic method handle adapters.
88 // Generate interpreter entries
89 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
90 mk <= Interpreter::method_handle_invoke_LAST;
91 mk = Interpreter::MethodKind(1 + (int)mk)) {
92 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
93 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
94 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
95 if (entry != NULL) {
96 Interpreter::set_entry_for_kind(mk, entry);
97 }
98 // If the entry is not set, it will throw AbstractMethodError.
99 }
100 }
101
102 void MethodHandles::set_enabled(bool z) {
103 if (_enabled != z) {
104 guarantee(z, "can only enable once");
105 _enabled = z;
106 }
107 }
108
109 // MemberName support
110
111 // import java_lang_invoke_MemberName.*
112 enum {
113 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
114 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
115 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
116 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
117 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
118 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
119 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
120 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
121 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
122 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
123 };
124
125 int MethodHandles::ref_kind_to_flags(int ref_kind) {
126 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
127 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
128 if (ref_kind_is_field(ref_kind)) {
129 flags |= IS_FIELD;
130 } else if (ref_kind_is_method(ref_kind)) {
131 flags |= IS_METHOD;
132 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
133 flags |= IS_CONSTRUCTOR;
134 }
135 return flags;
136 }
137
138 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
139 Handle empty;
140 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
141 if (!java_lang_String::is_instance_inlined(type())) {
142 return type; // already resolved
143 }
144 Symbol* signature = java_lang_String::as_symbol_or_null(type());
145 if (signature == NULL) {
146 return empty; // no such signature exists in the VM
147 }
148 Handle resolved;
149 int flags = java_lang_invoke_MemberName::flags(mname());
150 switch (flags & ALL_KINDS) {
151 case IS_METHOD:
152 case IS_CONSTRUCTOR:
153 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
154 break;
155 case IS_FIELD:
156 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
157 break;
158 default:
159 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
160 }
161 if (resolved.is_null()) {
162 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
163 }
164 return resolved;
165 }
166
167 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
168 // This method is used from java.lang.invoke.MemberName constructors.
169 // It fills in the new MemberName from a java.lang.reflect.Member.
170 Thread* thread = Thread::current();
171 oop target_oop = target();
172 Klass* target_klass = target_oop->klass();
173 if (target_klass == SystemDictionary::reflect_Field_klass()) {
174 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
175 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
176 Klass* k = java_lang_Class::as_Klass(clazz);
177 if (k != NULL && k->is_instance_klass()) {
178 fieldDescriptor fd(InstanceKlass::cast(k), slot);
179 oop mname2 = init_field_MemberName(mname, fd);
180 if (mname2 != NULL) {
181 // Since we have the reified name and type handy, add them to the result.
182 if (java_lang_invoke_MemberName::name(mname2) == NULL)
183 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
184 if (java_lang_invoke_MemberName::type(mname2) == NULL)
185 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
186 }
187 return mname2;
188 }
189 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
190 oop clazz = java_lang_reflect_Method::clazz(target_oop);
191 int slot = java_lang_reflect_Method::slot(target_oop);
192 Klass* k = java_lang_Class::as_Klass(clazz);
193 if (k != NULL && k->is_instance_klass()) {
194 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
195 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
196 return NULL; // do not resolve unless there is a concrete signature
197 CallInfo info(m, k, CHECK_NULL);
198 return init_method_MemberName(mname, info);
199 }
200 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
201 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
202 int slot = java_lang_reflect_Constructor::slot(target_oop);
203 Klass* k = java_lang_Class::as_Klass(clazz);
204 if (k != NULL && k->is_instance_klass()) {
205 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
206 if (m == NULL) return NULL;
207 CallInfo info(m, k, CHECK_NULL);
208 return init_method_MemberName(mname, info);
209 }
210 }
211 return NULL;
212 }
213
214 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
215 assert(info.resolved_appendix().is_null(), "only normal methods here");
216 methodHandle m = info.resolved_method();
217 assert(m.not_null(), "null method handle");
218 Klass* m_klass = m->method_holder();
219 assert(m_klass != NULL, "null holder for method handle");
220 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
221 int vmindex = Method::invalid_vtable_index;
222
223 switch (info.call_kind()) {
224 case CallInfo::itable_call:
225 vmindex = info.itable_index();
226 // More importantly, the itable index only works with the method holder.
227 assert(m_klass->verify_itable_index(vmindex), "");
228 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
229 if (TraceInvokeDynamic) {
230 ttyLocker ttyl;
231 ResourceMark rm;
232 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
233 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
234 vmindex);
235 m->access_flags().print_on(tty);
236 if (!m->is_abstract()) {
237 tty->print("default");
238 }
239 tty->cr();
240 }
241 break;
242
243 case CallInfo::vtable_call:
244 vmindex = info.vtable_index();
245 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
246 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
247 if (m_klass->is_interface()) {
248 // This is a vtable call to an interface method (abstract "miranda method" or default method).
249 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
250 // (LinkResolver should help us figure this out.)
251 Klass* m_klass_non_interface = info.resolved_klass();
252 if (m_klass_non_interface->is_interface()) {
253 m_klass_non_interface = SystemDictionary::Object_klass();
254 #ifdef ASSERT
255 { ResourceMark rm;
256 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
257 assert(m->name() == m2->name() && m->signature() == m2->signature(),
258 "at %d, %s != %s", vmindex,
259 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
260 }
261 #endif //ASSERT
262 }
263 if (!m->is_public()) {
264 assert(m->is_public(), "virtual call must be to public interface method");
265 return NULL; // elicit an error later in product build
266 }
267 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
268 m_klass = m_klass_non_interface;
269 }
270 if (TraceInvokeDynamic) {
271 ttyLocker ttyl;
272 ResourceMark rm;
273 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
274 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
275 m_klass->internal_name(), vmindex);
276 m->access_flags().print_on(tty);
277 if (m->is_default_method()) {
278 tty->print("default");
279 }
280 tty->cr();
281 }
282 break;
283
284 case CallInfo::direct_call:
285 vmindex = Method::nonvirtual_vtable_index;
286 if (m->is_static()) {
287 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
288 } else if (m->is_initializer()) {
289 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
290 } else {
291 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
292 }
293 break;
294
295 default: assert(false, "bad CallInfo"); return NULL;
296 }
297
298 // @CallerSensitive annotation detected
299 if (m->caller_sensitive()) {
300 flags |= CALLER_SENSITIVE;
301 }
302
303 Handle resolved_method = info.resolved_method_name();
304 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m(),
305 "Should not change after link resolultion");
306
307 oop mname_oop = mname();
308 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
309 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
310 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
311 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
312 // Note: name and type can be lazily computed by resolve_MemberName,
313 // if Java code needs them as resolved String and MethodType objects.
314 // If relevant, the vtable or itable value is stored as vmindex.
315 // This is done eagerly, since it is readily available without
316 // constructing any new objects.
317 return mname();
318 }
319
320 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
321 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
322 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
323 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
324 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
325
326 oop mname_oop = mname();
327 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
328 java_lang_invoke_MemberName::set_method (mname_oop, NULL);
329 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
330 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror());
331
332 oop type = field_signature_type_or_null(fd.signature());
333 oop name = field_name_or_null(fd.name());
334 if (name != NULL)
335 java_lang_invoke_MemberName::set_name(mname_oop, name);
336 if (type != NULL)
337 java_lang_invoke_MemberName::set_type(mname_oop, type);
338 // Note: name and type can be lazily computed by resolve_MemberName,
339 // if Java code needs them as resolved String and Class objects.
340 // Note that the incoming type oop might be pre-resolved (non-null).
341 // The base clazz and field offset (vmindex) must be eagerly stored,
342 // because they unambiguously identify the field.
343 // Although the fieldDescriptor::_index would also identify the field,
344 // we do not use it, because it is harder to decode.
345 // TO DO: maybe intern mname_oop
346 return mname();
347 }
348
349 // JVM 2.9 Special Methods:
350 // A method is signature polymorphic if and only if all of the following conditions hold :
351 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
352 // * It has a single formal parameter of type Object[].
353 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
354 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
355 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
356 if (klass == NULL)
357 return false;
358 // The following test will fail spuriously during bootstrap of MethodHandle itself:
359 // if (klass != SystemDictionary::MethodHandle_klass())
360 // Test the name instead:
361 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
362 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
363 return false;
364 }
365
366 // Look up signature polymorphic method with polymorphic return type
367 Symbol* poly_sig = vmSymbols::object_array_object_signature();
368 InstanceKlass* iklass = InstanceKlass::cast(klass);
369 Method* m = iklass->find_method(name, poly_sig);
370 if (m != NULL) {
371 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
372 int flags = m->access_flags().as_int();
373 if ((flags & required) == required) {
374 return true;
375 }
376 }
377
378 // Look up signature polymorphic method with non-polymorphic (non Object) return type
379 int me;
380 int ms = iklass->find_method_by_name(name, &me);
381 if (ms == -1) return false;
382 for (; ms < me; ms++) {
383 Method* m = iklass->methods()->at(ms);
384 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
385 int flags = m->access_flags().as_int();
386 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
387 return true;
388 }
389 }
390 return false;
391 }
392
393
394 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
395 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
396 switch (iid) {
397 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
398 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
399 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
400 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
401 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
402 default:
403 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
404 return 0;
405 }
406 }
407
408 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
409 switch(id) {
410 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
411 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
412 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
413 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
414 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
415 default:
416 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
417 return Bytecodes::_illegal;
418 }
419 }
420
421 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
422 switch (iid) {
423 case vmIntrinsics::_invokeBasic: return 0;
424 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
425 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
426 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
427 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
428 default:
429 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
430 return 0;
431 }
432 }
433
434 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
435 vmSymbols::SID name_id = vmSymbols::find_sid(name);
436 switch (name_id) {
437 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
438 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
439 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
440 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
441
442 // There is one static signature-polymorphic method for each JVM invocation mode.
443 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
444 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
445 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
446 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
447 default: break;
448 }
449
450 // Cover the case of invokeExact and any future variants of invokeFoo.
451 Klass* mh_klass = SystemDictionary::well_known_klass(
452 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
453 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
454 return vmIntrinsics::_invokeGeneric;
455 }
456
457 // Cover the case of methods on VarHandle.
458 Klass* vh_klass = SystemDictionary::well_known_klass(
459 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) );
460 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
461 return vmIntrinsics::_invokeGeneric;
462 }
463
464 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
465 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
466 return vmIntrinsics::_none;
467 }
468
469 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
470 if (klass != NULL &&
471 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
472 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
473 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
474 if (iid != vmIntrinsics::_none)
475 return iid;
476 if (is_method_handle_invoke_name(klass, name))
477 return vmIntrinsics::_invokeGeneric;
478 }
479 return vmIntrinsics::_none;
480 }
481
482
483 // convert the external string or reflective type to an internal signature
484 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
485 if (java_lang_invoke_MethodType::is_instance(type_str)) {
486 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
487 } else if (java_lang_Class::is_instance(type_str)) {
488 return java_lang_Class::as_signature(type_str, false, THREAD);
489 } else if (java_lang_String::is_instance_inlined(type_str)) {
490 if (intern_if_not_found) {
491 return java_lang_String::as_symbol(type_str, THREAD);
492 } else {
493 return java_lang_String::as_symbol_or_null(type_str);
494 }
495 } else {
496 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
497 }
498 }
499
500 static const char OBJ_SIG[] = "Ljava/lang/Object;";
501 enum { OBJ_SIG_LEN = 18 };
502
503 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
504 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
505 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
506 const int len = sig->utf8_length();
507 for (int i = 0; i < len; i++) {
508 switch (sig->byte_at(i)) {
509 case 'L':
510 // only java/lang/Object is valid here
511 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
512 return false;
513 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
514 continue;
515 case '(': case ')': case 'V':
516 case 'I': case 'J': case 'F': case 'D':
517 continue;
518 //case '[':
519 //case 'Z': case 'B': case 'C': case 'S':
520 default:
521 return false;
522 }
523 }
524 return true;
525 }
526
527 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
528 Symbol* bsig = NULL;
529 if (sig == NULL) {
530 return sig;
531 } else if (is_basic_type_signature(sig)) {
532 sig->increment_refcount();
533 return sig; // that was easy
534 } else if (sig->byte_at(0) != '(') {
535 BasicType bt = char2type(sig->byte_at(0));
536 if (is_subword_type(bt)) {
537 bsig = vmSymbols::int_signature();
538 } else {
539 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
540 bsig = vmSymbols::object_signature();
541 }
542 } else {
543 ResourceMark rm;
544 stringStream buffer(128);
545 buffer.put('(');
546 int arg_pos = 0, keep_arg_pos = -1;
547 if (keep_last_arg)
548 keep_arg_pos = ArgumentCount(sig).size() - 1;
549 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
550 BasicType bt = ss.type();
551 size_t this_arg_pos = buffer.size();
552 if (ss.at_return_type()) {
553 buffer.put(')');
554 }
555 if (arg_pos == keep_arg_pos) {
556 buffer.write((char*) ss.raw_bytes(),
557 (int) ss.raw_length());
558 } else if (bt == T_OBJECT || bt == T_ARRAY || bt == T_VALUETYPE) {
559 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
560 } else {
561 if (is_subword_type(bt))
562 bt = T_INT;
563 buffer.put(type2char(bt));
564 }
565 arg_pos++;
566 }
567 const char* sigstr = buffer.base();
568 int siglen = (int) buffer.size();
569 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
570 }
571 assert(is_basic_type_signature(bsig) ||
572 // detune assert in case the injected argument is not a basic type:
573 keep_last_arg, "");
574 return bsig;
575 }
576
577 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
578 Symbol* sig,
579 bool keep_arrays,
580 bool keep_basic_names) {
581 st = st ? st : tty;
582 int len = sig->utf8_length();
583 int array = 0;
584 bool prev_type = false;
585 for (int i = 0; i < len; i++) {
586 char ch = sig->byte_at(i);
587 switch (ch) {
588 case '(': case ')':
589 prev_type = false;
590 st->put(ch);
591 continue;
592 case '[':
593 if (!keep_basic_names && keep_arrays)
594 st->put(ch);
595 array++;
596 continue;
597 case 'L':
598 {
599 if (prev_type) st->put(',');
600 int start = i+1, slash = start;
601 while (++i < len && (ch = sig->byte_at(i)) != ';') {
602 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
603 }
604 if (slash < i) start = slash;
605 if (!keep_basic_names) {
606 st->put('L');
607 } else {
608 for (int j = start; j < i; j++)
609 st->put(sig->byte_at(j));
610 prev_type = true;
611 }
612 break;
613 }
614 default:
615 {
616 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
617 ch = '[';
618 array = 0;
619 }
620 if (prev_type) st->put(',');
621 const char* n = NULL;
622 if (keep_basic_names)
623 n = type2name(char2type(ch));
624 if (n == NULL) {
625 // unknown letter, or we don't want to know its name
626 st->put(ch);
627 } else {
628 st->print("%s", n);
629 prev_type = true;
630 }
631 break;
632 }
633 }
634 // Switch break goes here to take care of array suffix:
635 if (prev_type) {
636 while (array > 0) {
637 st->print("[]");
638 --array;
639 }
640 }
641 array = 0;
642 }
643 }
644
645
646
647 static oop object_java_mirror() {
648 return SystemDictionary::Object_klass()->java_mirror();
649 }
650
651 oop MethodHandles::field_name_or_null(Symbol* s) {
652 if (s == NULL) return NULL;
653 return StringTable::lookup(s);
654 }
655
656 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
657 if (s == NULL) return NULL;
658 BasicType bt = FieldType::basic_type(s);
659 if (is_java_primitive(bt)) {
660 assert(s->utf8_length() == 1, "");
661 return java_lang_Class::primitive_mirror(bt);
662 }
663 // Here are some more short cuts for common types.
664 // They are optional, since reference types can be resolved lazily.
665 if (bt == T_OBJECT) {
666 if (s == vmSymbols::object_signature()) {
667 return object_java_mirror();
668 } else if (s == vmSymbols::class_signature()) {
669 return SystemDictionary::Class_klass()->java_mirror();
670 } else if (s == vmSymbols::string_signature()) {
671 return SystemDictionary::String_klass()->java_mirror();
672 }
673 }
674 return NULL;
675 }
676
677
678 // An unresolved member name is a mere symbolic reference.
679 // Resolving it plants a vmtarget/vmindex in it,
680 // which refers directly to JVM internals.
681 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, TRAPS) {
682 Handle empty;
683 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
684
685 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
686 // Already resolved.
687 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
688 assert(vmindex >= Method::nonvirtual_vtable_index, "");
689 return mname;
690 }
691
692 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
693 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
694 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
695 int flags = java_lang_invoke_MemberName::flags(mname());
696 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
697 if (!ref_kind_is_valid(ref_kind)) {
698 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
699 }
700
701 DEBUG_ONLY(int old_vmindex);
702 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
703
704 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
705 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
706 }
707
708 InstanceKlass* defc = NULL;
709 {
710 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
711 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
712 if (!defc_klass->is_instance_klass()) {
713 if (!defc_klass->is_array_klass()) return empty;
714 defc_klass = SystemDictionary::Object_klass();
715 }
716 defc = InstanceKlass::cast(defc_klass);
717 }
718 if (defc == NULL) {
719 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
720 }
721 defc->link_class(CHECK_(empty)); // possible safepoint
722
723 // convert the external string name to an internal symbol
724 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
725 if (name == NULL) return empty; // no such name
726 if (name == vmSymbols::class_initializer_name())
727 return empty; // illegal name
728
729 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
730 if ((flags & ALL_KINDS) == IS_METHOD &&
731 (defc == SystemDictionary::MethodHandle_klass()) &&
732 (ref_kind == JVM_REF_invokeVirtual ||
733 ref_kind == JVM_REF_invokeSpecial ||
734 // static invocation mode is required for _linkToVirtual, etc.:
735 ref_kind == JVM_REF_invokeStatic)) {
736 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
737 if (iid != vmIntrinsics::_none &&
738 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
739 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
740 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
741 mh_invoke_id = iid;
742 }
743 }
744
745 // convert the external string or reflective type to an internal signature
746 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
747 if (type == NULL) return empty; // no such signature exists in the VM
748
749 LinkInfo::AccessCheck access_check = caller != NULL ?
750 LinkInfo::needs_access_check :
751 LinkInfo::skip_access_check;
752
753 // Time to do the lookup.
754 switch (flags & ALL_KINDS) {
755 case IS_METHOD:
756 {
757 CallInfo result;
758 LinkInfo link_info(defc, name, type, caller, access_check);
759 {
760 assert(!HAS_PENDING_EXCEPTION, "");
761 if (ref_kind == JVM_REF_invokeStatic) {
762 LinkResolver::resolve_static_call(result,
763 link_info, false, THREAD);
764 } else if (ref_kind == JVM_REF_invokeInterface) {
765 LinkResolver::resolve_interface_call(result, Handle(), defc,
766 link_info, false, THREAD);
767 } else if (mh_invoke_id != vmIntrinsics::_none) {
768 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
769 LinkResolver::resolve_handle_call(result, link_info, THREAD);
770 } else if (ref_kind == JVM_REF_invokeSpecial) {
771 LinkResolver::resolve_special_call(result, Handle(),
772 link_info, THREAD);
773 } else if (ref_kind == JVM_REF_invokeVirtual) {
774 LinkResolver::resolve_virtual_call(result, Handle(), defc,
775 link_info, false, THREAD);
776 } else {
777 assert(false, "ref_kind=%d", ref_kind);
778 }
779 if (HAS_PENDING_EXCEPTION) {
780 return empty;
781 }
782 }
783 if (result.resolved_appendix().not_null()) {
784 // The resolved MemberName must not be accompanied by an appendix argument,
785 // since there is no way to bind this value into the MemberName.
786 // Caller is responsible to prevent this from happening.
787 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
788 }
789 result.set_resolved_method_name(CHECK_(empty));
790 oop mname2 = init_method_MemberName(mname, result);
791 return Handle(THREAD, mname2);
792 }
793 case IS_CONSTRUCTOR:
794 {
795 CallInfo result;
796 LinkInfo link_info(defc, name, type, caller, access_check);
797 {
798 assert(!HAS_PENDING_EXCEPTION, "");
799 if (name == vmSymbols::object_initializer_name()) {
800 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
801 } else {
802 break; // will throw after end of switch
803 }
804 if (HAS_PENDING_EXCEPTION) {
805 return empty;
806 }
807 }
808 assert(result.is_statically_bound(), "");
809 result.set_resolved_method_name(CHECK_(empty));
810 oop mname2 = init_method_MemberName(mname, result);
811 return Handle(THREAD, mname2);
812 }
813 case IS_FIELD:
814 {
815 fieldDescriptor result; // find_field initializes fd if found
816 {
817 assert(!HAS_PENDING_EXCEPTION, "");
818 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
819 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
820 if (HAS_PENDING_EXCEPTION) {
821 return empty;
822 }
823 }
824 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
825 return Handle(THREAD, mname2);
826 }
827 default:
828 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
829 }
830
831 return empty;
832 }
833
834 // Conversely, a member name which is only initialized from JVM internals
835 // may have null defc, name, and type fields.
836 // Resolving it plants a vmtarget/vmindex in it,
837 // which refers directly to JVM internals.
838 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
839 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
840
841 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
842 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
843 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
844 int flags = java_lang_invoke_MemberName::flags(mname());
845
846 if (suppress != 0) {
847 if (suppress & _suppress_defc) have_defc = true;
848 if (suppress & _suppress_name) have_name = true;
849 if (suppress & _suppress_type) have_type = true;
850 }
851
852 if (have_defc && have_name && have_type) return; // nothing needed
853
854 switch (flags & ALL_KINDS) {
855 case IS_METHOD:
856 case IS_CONSTRUCTOR:
857 {
858 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
859 if (vmtarget == NULL) {
860 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
861 }
862 methodHandle m(THREAD, vmtarget);
863 DEBUG_ONLY(vmtarget = NULL); // safety
864 if (!have_defc) {
865 InstanceKlass* defc = m->method_holder();
866 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
867 }
868 if (!have_name) {
869 //not java_lang_String::create_from_symbol; let's intern member names
870 oop name = StringTable::intern(m->name(), CHECK);
871 java_lang_invoke_MemberName::set_name(mname(), name);
872 }
873 if (!have_type) {
874 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
875 java_lang_invoke_MemberName::set_type(mname(), type());
876 }
877 return;
878 }
879 case IS_FIELD:
880 {
881 oop clazz = java_lang_invoke_MemberName::clazz(mname());
882 if (clazz == NULL) {
883 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
884 }
885 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
886 DEBUG_ONLY(clazz = NULL); // safety
887 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
888 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
889 fieldDescriptor fd; // find_field initializes fd if found
890 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
891 break; // cannot expand
892 if (!have_name) {
893 //not java_lang_String::create_from_symbol; let's intern member names
894 oop name = StringTable::intern(fd.name(), CHECK);
895 java_lang_invoke_MemberName::set_name(mname(), name);
896 }
897 if (!have_type) {
898 // If it is a primitive field type, don't mess with short strings like "I".
899 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
900 if (type.is_null()) {
901 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
902 }
903 java_lang_invoke_MemberName::set_type(mname(), type());
904 }
905 return;
906 }
907 }
908 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
909 }
910
911 int MethodHandles::find_MemberNames(Klass* k,
912 Symbol* name, Symbol* sig,
913 int mflags, Klass* caller,
914 int skip, objArrayHandle results, TRAPS) {
915 // %%% take caller into account!
916
917 Thread* thread = Thread::current();
918
919 if (k == NULL || !k->is_instance_klass()) return -1;
920
921 int rfill = 0, rlimit = results->length(), rskip = skip;
922 // overflow measurement:
923 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
924
925 int match_flags = mflags;
926 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
927 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
928 bool local_only = !(search_superc | search_intfc);
929 bool classes_only = false;
930
931 if (name != NULL) {
932 if (name->utf8_length() == 0) return 0; // a match is not possible
933 }
934 if (sig != NULL) {
935 if (sig->utf8_length() == 0) return 0; // a match is not possible
936 if (sig->byte_at(0) == '(')
937 match_flags &= ~(IS_FIELD | IS_TYPE);
938 else
939 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
940 }
941
942 if ((match_flags & IS_TYPE) != 0) {
943 // NYI, and Core Reflection works quite well for this query
944 }
945
946 if ((match_flags & IS_FIELD) != 0) {
947 InstanceKlass* ik = InstanceKlass::cast(k);
948 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
949 if (name != NULL && st.name() != name)
950 continue;
951 if (sig != NULL && st.signature() != sig)
952 continue;
953 // passed the filters
954 if (rskip > 0) {
955 --rskip;
956 } else if (rfill < rlimit) {
957 Handle result(thread, results->obj_at(rfill++));
958 if (!java_lang_invoke_MemberName::is_instance(result()))
959 return -99; // caller bug!
960 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
961 if (saved != result())
962 results->obj_at_put(rfill-1, saved); // show saved instance to user
963 } else if (++overflow >= overflow_limit) {
964 match_flags = 0; break; // got tired of looking at overflow
965 }
966 }
967 }
968
969 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
970 // watch out for these guys:
971 Symbol* init_name = vmSymbols::object_initializer_name();
972 Symbol* clinit_name = vmSymbols::class_initializer_name();
973 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
974 bool negate_name_test = false;
975 // fix name so that it captures the intention of IS_CONSTRUCTOR
976 if (!(match_flags & IS_METHOD)) {
977 // constructors only
978 if (name == NULL) {
979 name = init_name;
980 } else if (name != init_name) {
981 return 0; // no constructors of this method name
982 }
983 } else if (!(match_flags & IS_CONSTRUCTOR)) {
984 // methods only
985 if (name == NULL) {
986 name = init_name;
987 negate_name_test = true; // if we see the name, we *omit* the entry
988 } else if (name == init_name) {
989 return 0; // no methods of this constructor name
990 }
991 } else {
992 // caller will accept either sort; no need to adjust name
993 }
994 InstanceKlass* ik = InstanceKlass::cast(k);
995 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
996 Method* m = st.method();
997 Symbol* m_name = m->name();
998 if (m_name == clinit_name)
999 continue;
1000 if (name != NULL && ((m_name != name) ^ negate_name_test))
1001 continue;
1002 if (sig != NULL && m->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 CallInfo info(m, NULL, CHECK_0);
1012 oop saved = MethodHandles::init_method_MemberName(result, info);
1013 if (saved != result())
1014 results->obj_at_put(rfill-1, saved); // show saved instance to user
1015 } else if (++overflow >= overflow_limit) {
1016 match_flags = 0; break; // got tired of looking at overflow
1017 }
1018 }
1019 }
1020
1021 // return number of elements we at leasted wanted to initialize
1022 return rfill + overflow;
1023 }
1024
1025 // Is it safe to remove stale entries from a dependency list?
1026 static bool safe_to_expunge() {
1027 // Since parallel GC threads can concurrently iterate over a dependency
1028 // list during safepoint, it is safe to remove entries only when
1029 // CodeCache lock is held.
1030 return CodeCache_lock->owned_by_self();
1031 }
1032
1033 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
1034 assert_locked_or_safepoint(CodeCache_lock);
1035
1036 oop context = java_lang_invoke_CallSite::context(call_site);
1037 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1038 // Try to purge stale entries on updates.
1039 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
1040 // in order to avoid memory leak, stale entries are purged whenever a dependency list
1041 // is changed (both on addition and removal). Though memory reclamation is delayed,
1042 // it avoids indefinite memory usage growth.
1043 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
1044 }
1045
1046 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
1047 assert_locked_or_safepoint(CodeCache_lock);
1048
1049 oop context = java_lang_invoke_CallSite::context(call_site);
1050 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1051 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
1052 }
1053
1054 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
1055 assert_lock_strong(Compile_lock);
1056
1057 int marked = 0;
1058 CallSiteDepChange changes(call_site, target);
1059 {
1060 NoSafepointVerifier nsv;
1061 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1062
1063 oop context = java_lang_invoke_CallSite::context(call_site());
1064 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1065 marked = deps.mark_dependent_nmethods(changes);
1066 }
1067 if (marked > 0) {
1068 // At least one nmethod has been marked for deoptimization.
1069 VM_Deoptimize op;
1070 VMThread::execute(&op);
1071 }
1072 }
1073
1074 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
1075 if (TraceMethodHandles) {
1076 const char* name = vmIntrinsics::name_at(iid);
1077 if (*name == '_') name += 1;
1078 const size_t len = strlen(name) + 50;
1079 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
1080 const char* suffix = "";
1081 if (is_signature_polymorphic(iid)) {
1082 if (is_signature_polymorphic_static(iid))
1083 suffix = "/static";
1084 else
1085 suffix = "/private";
1086 }
1087 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
1088 trace_method_handle(_masm, qname);
1089 // Note: Don't free the allocated char array because it's used
1090 // during runtime.
1091 }
1092 }
1093
1094 //
1095 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1096 // They are the private interface between this JVM and the HotSpot-specific
1097 // Java code that implements JSR 292 method handles.
1098 //
1099 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1100 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1101 //
1102
1103 #ifndef PRODUCT
1104 #define EACH_NAMED_CON(template, requirement) \
1105 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1106 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1107 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1108 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1109 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1110 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1111 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1112 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1113 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1114 /*end*/
1115
1116 #define IGNORE_REQ(req_expr) /* req_expr */
1117 #define ONE_PLUS(scope,value) 1+
1118 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1119 #define VALUE_COMMA(scope,value) scope::value,
1120 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1121 #define STRING_NULL(scope,value) #value "\0"
1122 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1123
1124 static bool advertise_con_value(int which) {
1125 if (which < 0) return false;
1126 bool ok = true;
1127 int count = 0;
1128 #define INC_COUNT(scope,value) \
1129 ++count;
1130 #define CHECK_REQ(req_expr) \
1131 if (which < count) return ok; \
1132 ok = (req_expr);
1133 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1134 #undef INC_COUNT
1135 #undef CHECK_REQ
1136 assert(count == con_value_count, "");
1137 if (which < count) return ok;
1138 return false;
1139 }
1140
1141 #undef ONE_PLUS
1142 #undef VALUE_COMMA
1143 #undef STRING_NULL
1144 #undef EACH_NAMED_CON
1145 #endif // PRODUCT
1146
1147 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1148 #ifndef PRODUCT
1149 if (advertise_con_value(which)) {
1150 assert(which >= 0 && which < con_value_count, "");
1151 int con = con_values[which];
1152 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1153 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1154 const char* str = &con_names[0];
1155 for (int i = 0; i < which; i++)
1156 str += strlen(str) + 1; // skip name and null
1157 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1158 box->obj_at_put(0, name);
1159 }
1160 return con;
1161 }
1162 #endif
1163 return 0;
1164 }
1165 JVM_END
1166
1167 // void init(MemberName self, AccessibleObject ref)
1168 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1169 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1170 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1171 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1172 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1173 MethodHandles::init_MemberName(mname, target, CHECK);
1174 }
1175 JVM_END
1176
1177 // void expand(MemberName self)
1178 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1179 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1180 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1181 MethodHandles::expand_MemberName(mname, 0, CHECK);
1182 }
1183 JVM_END
1184
1185 // void resolve(MemberName self, Class<?> caller)
1186 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1187 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1188 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1189
1190 // The trusted Java code that calls this method should already have performed
1191 // access checks on behalf of the given caller. But, we can verify this.
1192 if (VerifyMethodHandles && caller_jh != NULL &&
1193 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1194 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1195 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1196 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1197 }
1198
1199 // Reflection::verify_class_access can only handle instance classes.
1200 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1201 // Emulate LinkResolver::check_klass_accessability.
1202 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1203 if (caller != SystemDictionary::Object_klass()
1204 && Reflection::verify_class_access(caller,
1205 InstanceKlass::cast(reference_klass),
1206 true) != Reflection::ACCESS_OK) {
1207 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1208 }
1209 }
1210 }
1211
1212 Klass* caller = caller_jh == NULL ? NULL :
1213 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1214 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1215
1216 if (resolved.is_null()) {
1217 int flags = java_lang_invoke_MemberName::flags(mname());
1218 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1219 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1220 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1221 }
1222 if ((flags & ALL_KINDS) == IS_FIELD) {
1223 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1224 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1225 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1226 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1227 } else {
1228 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1229 }
1230 }
1231
1232 return JNIHandles::make_local(THREAD, resolved());
1233 }
1234 JVM_END
1235
1236 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1237 if (mname == NULL ||
1238 java_lang_invoke_MemberName::clazz(mname) == NULL) {
1239 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1240 } else {
1241 int flags = java_lang_invoke_MemberName::flags(mname);
1242 if ((flags & IS_FIELD) != 0 &&
1243 (must_be_static
1244 ? (flags & JVM_ACC_STATIC) != 0
1245 : (flags & JVM_ACC_STATIC) == 0)) {
1246 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1247 return (jlong) vmindex;
1248 }
1249 }
1250 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1251 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1252 return 0;
1253 }
1254
1255 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1256 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1257 }
1258 JVM_END
1259
1260 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1261 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1262 }
1263 JVM_END
1264
1265 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1266 // use the other function to perform sanity checks:
1267 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1268 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1269 return JNIHandles::make_local(THREAD, clazz);
1270 }
1271 JVM_END
1272
1273 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1274 if (mname_jh == NULL) return NULL;
1275 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1276 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1277 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1278 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1279 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1280 result->obj_at_put(0, x);
1281
1282 int flags = java_lang_invoke_MemberName::flags(mname());
1283 if ((flags & IS_FIELD) != 0) {
1284 x = java_lang_invoke_MemberName::clazz(mname());
1285 } else {
1286 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1287 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1288 x = mname();
1289 }
1290 result->obj_at_put(1, x);
1291 return JNIHandles::make_local(env, result());
1292 }
1293 JVM_END
1294
1295
1296
1297 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1298 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1299 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1300 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1301 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1302 if (clazz_jh == NULL || results_jh == NULL) return -1;
1303 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1304
1305 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1306 if (results.is_null() || !results->is_objArray()) return -1;
1307
1308 TempNewSymbol name = NULL;
1309 TempNewSymbol sig = NULL;
1310 if (name_jh != NULL) {
1311 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1312 if (name == NULL) return 0; // a match is not possible
1313 }
1314 if (sig_jh != NULL) {
1315 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1316 if (sig == NULL) return 0; // a match is not possible
1317 }
1318
1319 Klass* caller = NULL;
1320 if (caller_jh != NULL) {
1321 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1322 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1323 caller = java_lang_Class::as_Klass(caller_oop);
1324 }
1325
1326 if (name != NULL && sig != NULL && results.not_null()) {
1327 // try a direct resolve
1328 // %%% TO DO
1329 }
1330
1331 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1332 caller, skip, results, CHECK_0);
1333 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1334 return res;
1335 }
1336 JVM_END
1337
1338 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1339 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1340 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1341 {
1342 // Walk all nmethods depending on this call site.
1343 MutexLocker mu(Compile_lock, thread);
1344 MethodHandles::flush_dependent_nmethods(call_site, target);
1345 java_lang_invoke_CallSite::set_target(call_site(), target());
1346 }
1347 }
1348 JVM_END
1349
1350 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1351 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1352 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1353 {
1354 // Walk all nmethods depending on this call site.
1355 MutexLocker mu(Compile_lock, thread);
1356 MethodHandles::flush_dependent_nmethods(call_site, target);
1357 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1358 }
1359 }
1360 JVM_END
1361
1362 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1363 jobject caller_jh, jintArray index_info_jh,
1364 jint start, jint end,
1365 jobjectArray buf_jh, jint pos,
1366 jboolean resolve, jobject ifna_jh)) {
1367 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1368 if (caller_k == NULL || !caller_k->is_instance_klass()) {
1369 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1370 }
1371 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1372 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1373 if (index_info_oop == NULL ||
1374 index_info_oop->klass() != Universe::intArrayKlassObj() ||
1375 typeArrayOop(index_info_oop)->length() < 2) {
1376 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1377 }
1378 typeArrayHandle index_info(THREAD, index_info_oop);
1379 int bss_index_in_pool = index_info->int_at(1);
1380 // While we are here, take a quick look at the index info:
1381 if (bss_index_in_pool <= 0 ||
1382 bss_index_in_pool >= caller->constants()->length() ||
1383 index_info->int_at(0)
1384 != caller->constants()->invoke_dynamic_argument_count_at(bss_index_in_pool)) {
1385 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1386 }
1387 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1388 if (start < 0) {
1389 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1390 if (start == pseudo_index) {
1391 if (start >= end || 0 > pos || pos >= buf->length()) break;
1392 oop pseudo_arg = NULL;
1393 switch (pseudo_index) {
1394 case -4: // bootstrap method
1395 {
1396 int bsm_index = caller->constants()->invoke_dynamic_bootstrap_method_ref_index_at(bss_index_in_pool);
1397 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1398 break;
1399 }
1400 case -3: // name
1401 {
1402 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool);
1403 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1404 pseudo_arg = str();
1405 break;
1406 }
1407 case -2: // type
1408 {
1409 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool);
1410 Handle th;
1411 if (type->byte_at(0) == '(') {
1412 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1413 } else {
1414 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1415 }
1416 pseudo_arg = th();
1417 break;
1418 }
1419 case -1: // argument count
1420 {
1421 int argc = caller->constants()->invoke_dynamic_argument_count_at(bss_index_in_pool);
1422 jvalue argc_value; argc_value.i = (jint)argc;
1423 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1424 break;
1425 }
1426 }
1427
1428 // Store the pseudo-argument, and advance the pointers.
1429 buf->obj_at_put(pos++, pseudo_arg);
1430 ++start;
1431 }
1432 }
1433 // When we are done with this there may be regular arguments to process too.
1434 }
1435 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1436 caller->constants()->
1437 copy_bootstrap_arguments_at(bss_index_in_pool,
1438 start, end, buf, pos,
1439 (resolve == JNI_TRUE), ifna, CHECK);
1440 }
1441 JVM_END
1442
1443 // It is called by a Cleaner object which ensures that dropped CallSites properly
1444 // deallocate their dependency information.
1445 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1446 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1447 {
1448 // Walk all nmethods depending on this call site.
1449 MutexLocker mu1(Compile_lock, thread);
1450
1451 int marked = 0;
1452 {
1453 NoSafepointVerifier nsv;
1454 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1455 assert(safe_to_expunge(), "removal is not safe");
1456 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1457 marked = deps.remove_all_dependents();
1458 }
1459 if (marked > 0) {
1460 // At least one nmethod has been marked for deoptimization
1461 VM_Deoptimize op;
1462 VMThread::execute(&op);
1463 }
1464 }
1465 }
1466 JVM_END
1467
1468 /**
1469 * Throws a java/lang/UnsupportedOperationException unconditionally.
1470 * This is required by the specification of MethodHandle.invoke if
1471 * invoked directly.
1472 */
1473 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1474 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1475 return NULL;
1476 }
1477 JVM_END
1478
1479 /**
1480 * Throws a java/lang/UnsupportedOperationException unconditionally.
1481 * This is required by the specification of MethodHandle.invokeExact if
1482 * invoked directly.
1483 */
1484 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1485 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1486 return NULL;
1487 }
1488 JVM_END
1489
1490 /// JVM_RegisterMethodHandleMethods
1491
1492 #undef CS // Solaris builds complain
1493
1494 #define LANG "Ljava/lang/"
1495 #define JLINV "Ljava/lang/invoke/"
1496
1497 #define OBJ LANG "Object;"
1498 #define CLS LANG "Class;"
1499 #define STRG LANG "String;"
1500 #define CS JLINV "CallSite;"
1501 #define MT JLINV "MethodType;"
1502 #define MH JLINV "MethodHandle;"
1503 #define MEM JLINV "MemberName;"
1504 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1505
1506 #define CC (char*) /*cast a literal from (const char*)*/
1507 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1508
1509 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1510 static JNINativeMethod MHN_methods[] = {
1511 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1512 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1513 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)},
1514 // static native int getNamedCon(int which, Object[] name)
1515 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1516 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1517 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1518 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1519 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1520 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1521 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1522 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1523 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1524 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1525 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1526 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1527 };
1528
1529 static JNINativeMethod MH_methods[] = {
1530 // UnsupportedOperationException throwers
1531 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1532 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1533 };
1534
1535 /**
1536 * This one function is exported, used by NativeLookup.
1537 */
1538 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1539 assert(!MethodHandles::enabled(), "must not be enabled");
1540 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1541
1542 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1543 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1544
1545 {
1546 ThreadToNativeFromVM ttnfv(thread);
1547
1548 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1549 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1550 "register java.lang.invoke.MethodHandleNative natives");
1551
1552 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1553 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1554 "register java.lang.invoke.MethodHandle natives");
1555 }
1556
1557 if (TraceInvokeDynamic) {
1558 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1559 }
1560
1561 MethodHandles::set_enabled(true);
1562 }
1563 JVM_END