1 /*
2 * Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/dependencyContext.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "interpreter/oopMapCache.hpp"
33 #include "interpreter/linkResolver.hpp"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "oops/objArrayOop.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "oops/typeArrayOop.inline.hpp"
40 #include "prims/methodHandles.hpp"
41 #include "runtime/compilationPolicy.hpp"
42 #include "runtime/interfaceSupport.inline.hpp"
43 #include "runtime/javaCalls.hpp"
44 #include "runtime/jniHandles.inline.hpp"
45 #include "runtime/timerTrace.hpp"
46 #include "runtime/reflection.hpp"
47 #include "runtime/signature.hpp"
48 #include "runtime/stubRoutines.hpp"
49 #include "utilities/exceptions.hpp"
50
51
52 /*
53 * JSR 292 reference implementation: method handles
54 * The JDK 7 reference implementation represented method handle
55 * combinations as chains. Each link in the chain had a "vmentry"
56 * field which pointed at a bit of assembly code which performed
57 * one transformation before dispatching to the next link in the chain.
58 *
59 * The current reference implementation pushes almost all code generation
60 * responsibility to (trusted) Java code. A method handle contains a
61 * pointer to its "LambdaForm", which embodies all details of the method
62 * handle's behavior. The LambdaForm is a normal Java object, managed
63 * by a runtime coded in Java.
64 */
65
66 bool MethodHandles::_enabled = false; // set true after successful native linkage
67 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
68
69 /**
70 * Generates method handle adapters. Returns 'false' if memory allocation
71 * failed and true otherwise.
72 */
73 void MethodHandles::generate_adapters() {
74 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
75 assert(_adapter_code == NULL, "generate only once");
76
77 ResourceMark rm;
78 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
79 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
80 CodeBuffer code(_adapter_code);
81 MethodHandlesAdapterGenerator g(&code);
82 g.generate();
83 code.log_section_sizes("MethodHandlesAdapterBlob");
84 }
85
86 //------------------------------------------------------------------------------
87 // MethodHandlesAdapterGenerator::generate
88 //
89 void MethodHandlesAdapterGenerator::generate() {
90 // Generate generic method handle adapters.
91 // Generate interpreter entries
92 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
93 mk <= Interpreter::method_handle_invoke_LAST;
94 mk = Interpreter::MethodKind(1 + (int)mk)) {
95 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
96 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
97 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
98 if (entry != NULL) {
99 Interpreter::set_entry_for_kind(mk, entry);
100 }
101 // If the entry is not set, it will throw AbstractMethodError.
102 }
103 }
104
105 void MethodHandles::set_enabled(bool z) {
106 if (_enabled != z) {
107 guarantee(z, "can only enable once");
108 _enabled = z;
109 }
110 }
111
112 // MemberName support
113
114 // import java_lang_invoke_MemberName.*
115 enum {
116 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
117 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
118 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
119 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
120 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
121 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
122 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
123 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
124 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
125 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
126 };
127
128 int MethodHandles::ref_kind_to_flags(int ref_kind) {
129 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
130 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
131 if (ref_kind_is_field(ref_kind)) {
132 flags |= IS_FIELD;
133 } else if (ref_kind_is_method(ref_kind)) {
134 flags |= IS_METHOD;
135 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
136 flags |= IS_CONSTRUCTOR;
137 }
138 return flags;
139 }
140
141 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
142 Handle empty;
143 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
144 if (!java_lang_String::is_instance_inlined(type())) {
145 return type; // already resolved
146 }
147 Symbol* signature = java_lang_String::as_symbol_or_null(type());
148 if (signature == NULL) {
149 return empty; // no such signature exists in the VM
150 }
151 Handle resolved;
152 int flags = java_lang_invoke_MemberName::flags(mname());
153 switch (flags & ALL_KINDS) {
154 case IS_METHOD:
155 case IS_CONSTRUCTOR:
156 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
157 break;
158 case IS_FIELD:
159 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
160 break;
161 default:
162 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
163 }
164 if (resolved.is_null()) {
165 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
166 }
167 return resolved;
168 }
169
170 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
171 // This method is used from java.lang.invoke.MemberName constructors.
172 // It fills in the new MemberName from a java.lang.reflect.Member.
173 Thread* thread = Thread::current();
174 oop target_oop = target();
175 Klass* target_klass = target_oop->klass();
176 if (target_klass == SystemDictionary::reflect_Field_klass()) {
177 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
178 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
179 Klass* k = java_lang_Class::as_Klass(clazz);
180 if (k != NULL && k->is_instance_klass()) {
181 fieldDescriptor fd(InstanceKlass::cast(k), slot);
182 oop mname2 = init_field_MemberName(mname, fd);
183 if (mname2 != NULL) {
184 // Since we have the reified name and type handy, add them to the result.
185 if (java_lang_invoke_MemberName::name(mname2) == NULL)
186 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
187 if (java_lang_invoke_MemberName::type(mname2) == NULL)
188 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
189 }
190 return mname2;
191 }
192 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
193 oop clazz = java_lang_reflect_Method::clazz(target_oop);
194 int slot = java_lang_reflect_Method::slot(target_oop);
195 Klass* k = java_lang_Class::as_Klass(clazz);
196 if (k != NULL && k->is_instance_klass()) {
197 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
198 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
199 return NULL; // do not resolve unless there is a concrete signature
200 CallInfo info(m, k, CHECK_NULL);
201 return init_method_MemberName(mname, info);
202 }
203 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
204 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
205 int slot = java_lang_reflect_Constructor::slot(target_oop);
206 Klass* k = java_lang_Class::as_Klass(clazz);
207 if (k != NULL && k->is_instance_klass()) {
208 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
209 if (m == NULL) return NULL;
210 CallInfo info(m, k, CHECK_NULL);
211 return init_method_MemberName(mname, info);
212 }
213 }
214 return NULL;
215 }
216
217 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
218 assert(info.resolved_appendix().is_null(), "only normal methods here");
219 methodHandle m = info.resolved_method();
220 assert(m.not_null(), "null method handle");
221 Klass* m_klass = m->method_holder();
222 assert(m_klass != NULL, "null holder for method handle");
223 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
224 int vmindex = Method::invalid_vtable_index;
225
226 switch (info.call_kind()) {
227 case CallInfo::itable_call:
228 vmindex = info.itable_index();
229 // More importantly, the itable index only works with the method holder.
230 assert(m_klass->verify_itable_index(vmindex), "");
231 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
232 if (TraceInvokeDynamic) {
233 ttyLocker ttyl;
234 ResourceMark rm;
235 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
236 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
237 vmindex);
238 m->access_flags().print_on(tty);
239 if (!m->is_abstract()) {
240 tty->print("default");
241 }
242 tty->cr();
243 }
244 break;
245
246 case CallInfo::vtable_call:
247 vmindex = info.vtable_index();
248 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
249 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
250 if (m_klass->is_interface()) {
251 // This is a vtable call to an interface method (abstract "miranda method" or default method).
252 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
253 // (LinkResolver should help us figure this out.)
254 Klass* m_klass_non_interface = info.resolved_klass();
255 if (m_klass_non_interface->is_interface()) {
256 m_klass_non_interface = SystemDictionary::Object_klass();
257 #ifdef ASSERT
258 { ResourceMark rm;
259 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
260 assert(m->name() == m2->name() && m->signature() == m2->signature(),
261 "at %d, %s != %s", vmindex,
262 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
263 }
264 #endif //ASSERT
265 }
266 if (!m->is_public()) {
267 assert(m->is_public(), "virtual call must be to public interface method");
268 return NULL; // elicit an error later in product build
269 }
270 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
271 m_klass = m_klass_non_interface;
272 }
273 if (TraceInvokeDynamic) {
274 ttyLocker ttyl;
275 ResourceMark rm;
276 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
277 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
278 m_klass->internal_name(), vmindex);
279 m->access_flags().print_on(tty);
280 if (m->is_default_method()) {
281 tty->print("default");
282 }
283 tty->cr();
284 }
285 break;
286
287 case CallInfo::direct_call:
288 vmindex = Method::nonvirtual_vtable_index;
289 if (m->is_static()) {
290 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
291 } else if (m->is_initializer()) {
292 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
293 } else {
294 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
295 }
296 break;
297
298 default: assert(false, "bad CallInfo"); return NULL;
299 }
300
301 // @CallerSensitive annotation detected
302 if (m->caller_sensitive()) {
303 flags |= CALLER_SENSITIVE;
304 }
305
306 Handle resolved_method = info.resolved_method_name();
307 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m(),
308 "Should not change after link resolultion");
309
310 oop mname_oop = mname();
311 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
312 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
313 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
314 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
315 // Note: name and type can be lazily computed by resolve_MemberName,
316 // if Java code needs them as resolved String and MethodType objects.
317 // If relevant, the vtable or itable value is stored as vmindex.
318 // This is done eagerly, since it is readily available without
319 // constructing any new objects.
320 return mname();
321 }
322
323 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
324 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
325 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
326 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
327 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
328
329 oop mname_oop = mname();
330 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
331 java_lang_invoke_MemberName::set_method (mname_oop, NULL);
332 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
333 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror());
334
335 oop type = field_signature_type_or_null(fd.signature());
336 oop name = field_name_or_null(fd.name());
337 if (name != NULL)
338 java_lang_invoke_MemberName::set_name(mname_oop, name);
339 if (type != NULL)
340 java_lang_invoke_MemberName::set_type(mname_oop, type);
341 // Note: name and type can be lazily computed by resolve_MemberName,
342 // if Java code needs them as resolved String and Class objects.
343 // Note that the incoming type oop might be pre-resolved (non-null).
344 // The base clazz and field offset (vmindex) must be eagerly stored,
345 // because they unambiguously identify the field.
346 // Although the fieldDescriptor::_index would also identify the field,
347 // we do not use it, because it is harder to decode.
348 // TO DO: maybe intern mname_oop
349 return mname();
350 }
351
352 // JVM 2.9 Special Methods:
353 // A method is signature polymorphic if and only if all of the following conditions hold :
354 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
355 // * It has a single formal parameter of type Object[].
356 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
357 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
358 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
359 if (klass == NULL)
360 return false;
361 // The following test will fail spuriously during bootstrap of MethodHandle itself:
362 // if (klass != SystemDictionary::MethodHandle_klass())
363 // Test the name instead:
364 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
365 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
366 return false;
367 }
368
369 // Look up signature polymorphic method with polymorphic return type
370 Symbol* poly_sig = vmSymbols::object_array_object_signature();
371 InstanceKlass* iklass = InstanceKlass::cast(klass);
372 Method* m = iklass->find_method(name, poly_sig);
373 if (m != NULL) {
374 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
375 int flags = m->access_flags().as_int();
376 if ((flags & required) == required) {
377 return true;
378 }
379 }
380
381 // Look up signature polymorphic method with non-polymorphic (non Object) return type
382 int me;
383 int ms = iklass->find_method_by_name(name, &me);
384 if (ms == -1) return false;
385 for (; ms < me; ms++) {
386 Method* m = iklass->methods()->at(ms);
387 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
388 int flags = m->access_flags().as_int();
389 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
390 return true;
391 }
392 }
393 return false;
394 }
395
396
397 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
398 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
399 switch (iid) {
400 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
401 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
402 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
403 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
404 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
405 default:
406 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
407 return 0;
408 }
409 }
410
411 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
412 switch(id) {
413 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
414 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
415 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
416 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
417 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
418 default:
419 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
420 return Bytecodes::_illegal;
421 }
422 }
423
424 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
425 switch (iid) {
426 case vmIntrinsics::_invokeBasic: return 0;
427 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
428 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
429 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
430 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
431 default:
432 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
433 return 0;
434 }
435 }
436
437 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
438 vmSymbols::SID name_id = vmSymbols::find_sid(name);
439 switch (name_id) {
440 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
441 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
442 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
443 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
444
445 // There is one static signature-polymorphic method for each JVM invocation mode.
446 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
447 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
448 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
449 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
450 default: break;
451 }
452
453 // Cover the case of invokeExact and any future variants of invokeFoo.
454 Klass* mh_klass = SystemDictionary::well_known_klass(
455 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
456 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
457 return vmIntrinsics::_invokeGeneric;
458 }
459
460 // Cover the case of methods on VarHandle.
461 Klass* vh_klass = SystemDictionary::well_known_klass(
462 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) );
463 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
464 return vmIntrinsics::_invokeGeneric;
465 }
466
467 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
468 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
469 return vmIntrinsics::_none;
470 }
471
472 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
473 if (klass != NULL &&
474 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
475 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
476 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
477 if (iid != vmIntrinsics::_none)
478 return iid;
479 if (is_method_handle_invoke_name(klass, name))
480 return vmIntrinsics::_invokeGeneric;
481 }
482 return vmIntrinsics::_none;
483 }
484
485
486 // convert the external string or reflective type to an internal signature
487 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
488 if (java_lang_invoke_MethodType::is_instance(type_str)) {
489 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
490 } else if (java_lang_Class::is_instance(type_str)) {
491 return java_lang_Class::as_signature(type_str, false, THREAD);
492 } else if (java_lang_String::is_instance_inlined(type_str)) {
493 if (intern_if_not_found) {
494 return java_lang_String::as_symbol(type_str, THREAD);
495 } else {
496 return java_lang_String::as_symbol_or_null(type_str);
497 }
498 } else {
499 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
500 }
501 }
502
503 static const char OBJ_SIG[] = "Ljava/lang/Object;";
504 enum { OBJ_SIG_LEN = 18 };
505
506 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
507 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
508 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
509 const int len = sig->utf8_length();
510 for (int i = 0; i < len; i++) {
511 switch (sig->byte_at(i)) {
512 case 'L':
513 // only java/lang/Object is valid here
514 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
515 return false;
516 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
517 continue;
518 case '(': case ')': case 'V':
519 case 'I': case 'J': case 'F': case 'D':
520 continue;
521 //case '[':
522 //case 'Z': case 'B': case 'C': case 'S':
523 default:
524 return false;
525 }
526 }
527 return true;
528 }
529
530 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
531 Symbol* bsig = NULL;
532 if (sig == NULL) {
533 return sig;
534 } else if (is_basic_type_signature(sig)) {
535 sig->increment_refcount();
536 return sig; // that was easy
537 } else if (sig->byte_at(0) != '(') {
538 BasicType bt = char2type(sig->byte_at(0));
539 if (is_subword_type(bt)) {
540 bsig = vmSymbols::int_signature();
541 } else {
542 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
543 bsig = vmSymbols::object_signature();
544 }
545 } else {
546 ResourceMark rm;
547 stringStream buffer(128);
548 buffer.put('(');
549 int arg_pos = 0, keep_arg_pos = -1;
550 if (keep_last_arg)
551 keep_arg_pos = ArgumentCount(sig).size() - 1;
552 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
553 BasicType bt = ss.type();
554 size_t this_arg_pos = buffer.size();
555 if (ss.at_return_type()) {
556 buffer.put(')');
557 }
558 if (arg_pos == keep_arg_pos) {
559 buffer.write((char*) ss.raw_bytes(),
560 (int) ss.raw_length());
561 } else if (bt == T_OBJECT || bt == T_ARRAY) {
562 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
563 } else {
564 if (is_subword_type(bt))
565 bt = T_INT;
566 buffer.put(type2char(bt));
567 }
568 arg_pos++;
569 }
570 const char* sigstr = buffer.base();
571 int siglen = (int) buffer.size();
572 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
573 }
574 assert(is_basic_type_signature(bsig) ||
575 // detune assert in case the injected argument is not a basic type:
576 keep_last_arg, "");
577 return bsig;
578 }
579
580 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
581 Symbol* sig,
582 bool keep_arrays,
583 bool keep_basic_names) {
584 st = st ? st : tty;
585 int len = sig->utf8_length();
586 int array = 0;
587 bool prev_type = false;
588 for (int i = 0; i < len; i++) {
589 char ch = sig->byte_at(i);
590 switch (ch) {
591 case '(': case ')':
592 prev_type = false;
593 st->put(ch);
594 continue;
595 case '[':
596 if (!keep_basic_names && keep_arrays)
597 st->put(ch);
598 array++;
599 continue;
600 case 'L':
601 {
602 if (prev_type) st->put(',');
603 int start = i+1, slash = start;
604 while (++i < len && (ch = sig->byte_at(i)) != ';') {
605 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
606 }
607 if (slash < i) start = slash;
608 if (!keep_basic_names) {
609 st->put('L');
610 } else {
611 for (int j = start; j < i; j++)
612 st->put(sig->byte_at(j));
613 prev_type = true;
614 }
615 break;
616 }
617 default:
618 {
619 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
620 ch = '[';
621 array = 0;
622 }
623 if (prev_type) st->put(',');
624 const char* n = NULL;
625 if (keep_basic_names)
626 n = type2name(char2type(ch));
627 if (n == NULL) {
628 // unknown letter, or we don't want to know its name
629 st->put(ch);
630 } else {
631 st->print("%s", n);
632 prev_type = true;
633 }
634 break;
635 }
636 }
637 // Switch break goes here to take care of array suffix:
638 if (prev_type) {
639 while (array > 0) {
640 st->print("[]");
641 --array;
642 }
643 }
644 array = 0;
645 }
646 }
647
648
649
650 static oop object_java_mirror() {
651 return SystemDictionary::Object_klass()->java_mirror();
652 }
653
654 oop MethodHandles::field_name_or_null(Symbol* s) {
655 if (s == NULL) return NULL;
656 return StringTable::lookup(s);
657 }
658
659 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
660 if (s == NULL) return NULL;
661 BasicType bt = FieldType::basic_type(s);
662 if (is_java_primitive(bt)) {
663 assert(s->utf8_length() == 1, "");
664 return java_lang_Class::primitive_mirror(bt);
665 }
666 // Here are some more short cuts for common types.
667 // They are optional, since reference types can be resolved lazily.
668 if (bt == T_OBJECT) {
669 if (s == vmSymbols::object_signature()) {
670 return object_java_mirror();
671 } else if (s == vmSymbols::class_signature()) {
672 return SystemDictionary::Class_klass()->java_mirror();
673 } else if (s == vmSymbols::string_signature()) {
674 return SystemDictionary::String_klass()->java_mirror();
675 }
676 }
677 return NULL;
678 }
679
680
681 // An unresolved member name is a mere symbolic reference.
682 // Resolving it plants a vmtarget/vmindex in it,
683 // which refers directly to JVM internals.
684 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, TRAPS) {
685 Handle empty;
686 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
687
688 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
689 // Already resolved.
690 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
691 assert(vmindex >= Method::nonvirtual_vtable_index, "");
692 return mname;
693 }
694
695 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
696 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
697 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
698 int flags = java_lang_invoke_MemberName::flags(mname());
699 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
700 if (!ref_kind_is_valid(ref_kind)) {
701 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
702 }
703
704 DEBUG_ONLY(int old_vmindex);
705 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
706
707 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
708 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
709 }
710
711 InstanceKlass* defc = NULL;
712 {
713 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
714 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
715 if (!defc_klass->is_instance_klass()) {
716 if (!defc_klass->is_array_klass()) return empty;
717 defc_klass = SystemDictionary::Object_klass();
718 }
719 defc = InstanceKlass::cast(defc_klass);
720 }
721 if (defc == NULL) {
722 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
723 }
724 defc->link_class(CHECK_(empty)); // possible safepoint
725
726 // convert the external string name to an internal symbol
727 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
728 if (name == NULL) return empty; // no such name
729 if (name == vmSymbols::class_initializer_name())
730 return empty; // illegal name
731
732 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
733 if ((flags & ALL_KINDS) == IS_METHOD &&
734 (defc == SystemDictionary::MethodHandle_klass()) &&
735 (ref_kind == JVM_REF_invokeVirtual ||
736 ref_kind == JVM_REF_invokeSpecial ||
737 // static invocation mode is required for _linkToVirtual, etc.:
738 ref_kind == JVM_REF_invokeStatic)) {
739 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
740 if (iid != vmIntrinsics::_none &&
741 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
742 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
743 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
744 mh_invoke_id = iid;
745 }
746 }
747
748 // convert the external string or reflective type to an internal signature
749 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
750 if (type == NULL) return empty; // no such signature exists in the VM
751
752 LinkInfo::AccessCheck access_check = caller != NULL ?
753 LinkInfo::needs_access_check :
754 LinkInfo::skip_access_check;
755
756 // Time to do the lookup.
757 switch (flags & ALL_KINDS) {
758 case IS_METHOD:
759 {
760 CallInfo result;
761 LinkInfo link_info(defc, name, type, caller, access_check);
762 {
763 assert(!HAS_PENDING_EXCEPTION, "");
764 if (ref_kind == JVM_REF_invokeStatic) {
765 LinkResolver::resolve_static_call(result,
766 link_info, false, THREAD);
767 } else if (ref_kind == JVM_REF_invokeInterface) {
768 LinkResolver::resolve_interface_call(result, Handle(), defc,
769 link_info, false, THREAD);
770 } else if (mh_invoke_id != vmIntrinsics::_none) {
771 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
772 LinkResolver::resolve_handle_call(result, link_info, THREAD);
773 } else if (ref_kind == JVM_REF_invokeSpecial) {
774 LinkResolver::resolve_special_call(result, Handle(),
775 link_info, THREAD);
776 } else if (ref_kind == JVM_REF_invokeVirtual) {
777 LinkResolver::resolve_virtual_call(result, Handle(), defc,
778 link_info, false, THREAD);
779 } else {
780 assert(false, "ref_kind=%d", ref_kind);
781 }
782 if (HAS_PENDING_EXCEPTION) {
783 return empty;
784 }
785 }
786 if (result.resolved_appendix().not_null()) {
787 // The resolved MemberName must not be accompanied by an appendix argument,
788 // since there is no way to bind this value into the MemberName.
789 // Caller is responsible to prevent this from happening.
790 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
791 }
792 result.set_resolved_method_name(CHECK_(empty));
793 oop mname2 = init_method_MemberName(mname, result);
794 return Handle(THREAD, mname2);
795 }
796 case IS_CONSTRUCTOR:
797 {
798 CallInfo result;
799 LinkInfo link_info(defc, name, type, caller, access_check);
800 {
801 assert(!HAS_PENDING_EXCEPTION, "");
802 if (name == vmSymbols::object_initializer_name()) {
803 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
804 } else {
805 break; // will throw after end of switch
806 }
807 if (HAS_PENDING_EXCEPTION) {
808 return empty;
809 }
810 }
811 assert(result.is_statically_bound(), "");
812 result.set_resolved_method_name(CHECK_(empty));
813 oop mname2 = init_method_MemberName(mname, result);
814 return Handle(THREAD, mname2);
815 }
816 case IS_FIELD:
817 {
818 fieldDescriptor result; // find_field initializes fd if found
819 {
820 assert(!HAS_PENDING_EXCEPTION, "");
821 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
822 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
823 if (HAS_PENDING_EXCEPTION) {
824 return empty;
825 }
826 }
827 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
828 return Handle(THREAD, mname2);
829 }
830 default:
831 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
832 }
833
834 return empty;
835 }
836
837 // Conversely, a member name which is only initialized from JVM internals
838 // may have null defc, name, and type fields.
839 // Resolving it plants a vmtarget/vmindex in it,
840 // which refers directly to JVM internals.
841 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
842 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
843
844 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
845 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
846 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
847 int flags = java_lang_invoke_MemberName::flags(mname());
848
849 if (suppress != 0) {
850 if (suppress & _suppress_defc) have_defc = true;
851 if (suppress & _suppress_name) have_name = true;
852 if (suppress & _suppress_type) have_type = true;
853 }
854
855 if (have_defc && have_name && have_type) return; // nothing needed
856
857 switch (flags & ALL_KINDS) {
858 case IS_METHOD:
859 case IS_CONSTRUCTOR:
860 {
861 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
862 if (vmtarget == NULL) {
863 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
864 }
865 methodHandle m(THREAD, vmtarget);
866 DEBUG_ONLY(vmtarget = NULL); // safety
867 if (!have_defc) {
868 InstanceKlass* defc = m->method_holder();
869 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
870 }
871 if (!have_name) {
872 //not java_lang_String::create_from_symbol; let's intern member names
873 oop name = StringTable::intern(m->name(), CHECK);
874 java_lang_invoke_MemberName::set_name(mname(), name);
875 }
876 if (!have_type) {
877 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
878 java_lang_invoke_MemberName::set_type(mname(), type());
879 }
880 return;
881 }
882 case IS_FIELD:
883 {
884 oop clazz = java_lang_invoke_MemberName::clazz(mname());
885 if (clazz == NULL) {
886 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
887 }
888 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
889 DEBUG_ONLY(clazz = NULL); // safety
890 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
891 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
892 fieldDescriptor fd; // find_field initializes fd if found
893 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
894 break; // cannot expand
895 if (!have_name) {
896 //not java_lang_String::create_from_symbol; let's intern member names
897 oop name = StringTable::intern(fd.name(), CHECK);
898 java_lang_invoke_MemberName::set_name(mname(), name);
899 }
900 if (!have_type) {
901 // If it is a primitive field type, don't mess with short strings like "I".
902 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
903 if (type.is_null()) {
904 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
905 }
906 java_lang_invoke_MemberName::set_type(mname(), type());
907 }
908 return;
909 }
910 }
911 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
912 }
913
914 int MethodHandles::find_MemberNames(Klass* k,
915 Symbol* name, Symbol* sig,
916 int mflags, Klass* caller,
917 int skip, objArrayHandle results, TRAPS) {
918 // %%% take caller into account!
919
920 Thread* thread = Thread::current();
921
922 if (k == NULL || !k->is_instance_klass()) return -1;
923
924 int rfill = 0, rlimit = results->length(), rskip = skip;
925 // overflow measurement:
926 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
927
928 int match_flags = mflags;
929 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
930 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
931 bool local_only = !(search_superc | search_intfc);
932 bool classes_only = false;
933
934 if (name != NULL) {
935 if (name->utf8_length() == 0) return 0; // a match is not possible
936 }
937 if (sig != NULL) {
938 if (sig->utf8_length() == 0) return 0; // a match is not possible
939 if (sig->byte_at(0) == '(')
940 match_flags &= ~(IS_FIELD | IS_TYPE);
941 else
942 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
943 }
944
945 if ((match_flags & IS_TYPE) != 0) {
946 // NYI, and Core Reflection works quite well for this query
947 }
948
949 if ((match_flags & IS_FIELD) != 0) {
950 InstanceKlass* ik = InstanceKlass::cast(k);
951 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
952 if (name != NULL && st.name() != name)
953 continue;
954 if (sig != NULL && st.signature() != sig)
955 continue;
956 // passed the filters
957 if (rskip > 0) {
958 --rskip;
959 } else if (rfill < rlimit) {
960 Handle result(thread, results->obj_at(rfill++));
961 if (!java_lang_invoke_MemberName::is_instance(result()))
962 return -99; // caller bug!
963 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
964 if (saved != result())
965 results->obj_at_put(rfill-1, saved); // show saved instance to user
966 } else if (++overflow >= overflow_limit) {
967 match_flags = 0; break; // got tired of looking at overflow
968 }
969 }
970 }
971
972 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
973 // watch out for these guys:
974 Symbol* init_name = vmSymbols::object_initializer_name();
975 Symbol* clinit_name = vmSymbols::class_initializer_name();
976 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
977 bool negate_name_test = false;
978 // fix name so that it captures the intention of IS_CONSTRUCTOR
979 if (!(match_flags & IS_METHOD)) {
980 // constructors only
981 if (name == NULL) {
982 name = init_name;
983 } else if (name != init_name) {
984 return 0; // no constructors of this method name
985 }
986 } else if (!(match_flags & IS_CONSTRUCTOR)) {
987 // methods only
988 if (name == NULL) {
989 name = init_name;
990 negate_name_test = true; // if we see the name, we *omit* the entry
991 } else if (name == init_name) {
992 return 0; // no methods of this constructor name
993 }
994 } else {
995 // caller will accept either sort; no need to adjust name
996 }
997 InstanceKlass* ik = InstanceKlass::cast(k);
998 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
999 Method* m = st.method();
1000 Symbol* m_name = m->name();
1001 if (m_name == clinit_name)
1002 continue;
1003 if (name != NULL && ((m_name != name) ^ negate_name_test))
1004 continue;
1005 if (sig != NULL && m->signature() != sig)
1006 continue;
1007 // passed the filters
1008 if (rskip > 0) {
1009 --rskip;
1010 } else if (rfill < rlimit) {
1011 Handle result(thread, results->obj_at(rfill++));
1012 if (!java_lang_invoke_MemberName::is_instance(result()))
1013 return -99; // caller bug!
1014 CallInfo info(m, NULL, CHECK_0);
1015 oop saved = MethodHandles::init_method_MemberName(result, info);
1016 if (saved != result())
1017 results->obj_at_put(rfill-1, saved); // show saved instance to user
1018 } else if (++overflow >= overflow_limit) {
1019 match_flags = 0; break; // got tired of looking at overflow
1020 }
1021 }
1022 }
1023
1024 // return number of elements we at leasted wanted to initialize
1025 return rfill + overflow;
1026 }
1027
1028 // Is it safe to remove stale entries from a dependency list?
1029 static bool safe_to_expunge() {
1030 // Since parallel GC threads can concurrently iterate over a dependency
1031 // list during safepoint, it is safe to remove entries only when
1032 // CodeCache lock is held.
1033 return CodeCache_lock->owned_by_self();
1034 }
1035
1036 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
1037 assert_locked_or_safepoint(CodeCache_lock);
1038
1039 oop context = java_lang_invoke_CallSite::context(call_site);
1040 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1041 // Try to purge stale entries on updates.
1042 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
1043 // in order to avoid memory leak, stale entries are purged whenever a dependency list
1044 // is changed (both on addition and removal). Though memory reclamation is delayed,
1045 // it avoids indefinite memory usage growth.
1046 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
1047 }
1048
1049 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
1050 assert_locked_or_safepoint(CodeCache_lock);
1051
1052 oop context = java_lang_invoke_CallSite::context(call_site);
1053 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1054 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
1055 }
1056
1057 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
1058 assert_lock_strong(Compile_lock);
1059
1060 int marked = 0;
1061 CallSiteDepChange changes(call_site, target);
1062 {
1063 NoSafepointVerifier nsv;
1064 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1065
1066 oop context = java_lang_invoke_CallSite::context(call_site());
1067 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1068 marked = deps.mark_dependent_nmethods(changes);
1069 }
1070 if (marked > 0) {
1071 // At least one nmethod has been marked for deoptimization.
1072 VM_Deoptimize op;
1073 VMThread::execute(&op);
1074 }
1075 }
1076
1077 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
1078 if (TraceMethodHandles) {
1079 const char* name = vmIntrinsics::name_at(iid);
1080 if (*name == '_') name += 1;
1081 const size_t len = strlen(name) + 50;
1082 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
1083 const char* suffix = "";
1084 if (is_signature_polymorphic(iid)) {
1085 if (is_signature_polymorphic_static(iid))
1086 suffix = "/static";
1087 else
1088 suffix = "/private";
1089 }
1090 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
1091 trace_method_handle(_masm, qname);
1092 // Note: Don't free the allocated char array because it's used
1093 // during runtime.
1094 }
1095 }
1096
1097 //
1098 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1099 // They are the private interface between this JVM and the HotSpot-specific
1100 // Java code that implements JSR 292 method handles.
1101 //
1102 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1103 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1104 //
1105
1106 #ifndef PRODUCT
1107 #define EACH_NAMED_CON(template, requirement) \
1108 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1109 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1110 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1111 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1112 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1113 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1114 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1115 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1116 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1117 /*end*/
1118
1119 #define IGNORE_REQ(req_expr) /* req_expr */
1120 #define ONE_PLUS(scope,value) 1+
1121 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1122 #define VALUE_COMMA(scope,value) scope::value,
1123 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1124 #define STRING_NULL(scope,value) #value "\0"
1125 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1126
1127 static bool advertise_con_value(int which) {
1128 if (which < 0) return false;
1129 bool ok = true;
1130 int count = 0;
1131 #define INC_COUNT(scope,value) \
1132 ++count;
1133 #define CHECK_REQ(req_expr) \
1134 if (which < count) return ok; \
1135 ok = (req_expr);
1136 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1137 #undef INC_COUNT
1138 #undef CHECK_REQ
1139 assert(count == con_value_count, "");
1140 if (which < count) return ok;
1141 return false;
1142 }
1143
1144 #undef ONE_PLUS
1145 #undef VALUE_COMMA
1146 #undef STRING_NULL
1147 #undef EACH_NAMED_CON
1148 #endif // PRODUCT
1149
1150 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1151 #ifndef PRODUCT
1152 if (advertise_con_value(which)) {
1153 assert(which >= 0 && which < con_value_count, "");
1154 int con = con_values[which];
1155 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1156 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1157 const char* str = &con_names[0];
1158 for (int i = 0; i < which; i++)
1159 str += strlen(str) + 1; // skip name and null
1160 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1161 box->obj_at_put(0, name);
1162 }
1163 return con;
1164 }
1165 #endif
1166 return 0;
1167 }
1168 JVM_END
1169
1170 // void init(MemberName self, AccessibleObject ref)
1171 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1172 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1173 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1174 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1175 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1176 MethodHandles::init_MemberName(mname, target, CHECK);
1177 }
1178 JVM_END
1179
1180 // void expand(MemberName self)
1181 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1182 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1183 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1184 MethodHandles::expand_MemberName(mname, 0, CHECK);
1185 }
1186 JVM_END
1187
1188 // void resolve(MemberName self, Class<?> caller)
1189 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1190 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1191 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1192
1193 // The trusted Java code that calls this method should already have performed
1194 // access checks on behalf of the given caller. But, we can verify this.
1195 if (VerifyMethodHandles && caller_jh != NULL &&
1196 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1197 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1198 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1199 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1200 }
1201
1202 // Reflection::verify_class_access can only handle instance classes.
1203 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1204 // Emulate LinkResolver::check_klass_accessability.
1205 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1206 if (caller != SystemDictionary::Object_klass()
1207 && Reflection::verify_class_access(caller,
1208 InstanceKlass::cast(reference_klass),
1209 true) != Reflection::ACCESS_OK) {
1210 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1211 }
1212 }
1213 }
1214
1215 Klass* caller = caller_jh == NULL ? NULL :
1216 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1217 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1218
1219 if (resolved.is_null()) {
1220 int flags = java_lang_invoke_MemberName::flags(mname());
1221 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1222 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1223 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1224 }
1225 if ((flags & ALL_KINDS) == IS_FIELD) {
1226 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1227 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1228 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1229 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1230 } else {
1231 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1232 }
1233 }
1234
1235 return JNIHandles::make_local(THREAD, resolved());
1236 }
1237 JVM_END
1238
1239 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1240 if (mname == NULL ||
1241 java_lang_invoke_MemberName::clazz(mname) == NULL) {
1242 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1243 } else {
1244 int flags = java_lang_invoke_MemberName::flags(mname);
1245 if ((flags & IS_FIELD) != 0 &&
1246 (must_be_static
1247 ? (flags & JVM_ACC_STATIC) != 0
1248 : (flags & JVM_ACC_STATIC) == 0)) {
1249 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1250 return (jlong) vmindex;
1251 }
1252 }
1253 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1254 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1255 return 0;
1256 }
1257
1258 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1259 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1260 }
1261 JVM_END
1262
1263 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1264 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1265 }
1266 JVM_END
1267
1268 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1269 // use the other function to perform sanity checks:
1270 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1271 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1272 return JNIHandles::make_local(THREAD, clazz);
1273 }
1274 JVM_END
1275
1276 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1277 if (mname_jh == NULL) return NULL;
1278 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1279 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1280 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1281 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1282 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1283 result->obj_at_put(0, x);
1284
1285 int flags = java_lang_invoke_MemberName::flags(mname());
1286 if ((flags & IS_FIELD) != 0) {
1287 x = java_lang_invoke_MemberName::clazz(mname());
1288 } else {
1289 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1290 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1291 x = mname();
1292 }
1293 result->obj_at_put(1, x);
1294 return JNIHandles::make_local(env, result());
1295 }
1296 JVM_END
1297
1298
1299
1300 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1301 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1302 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1303 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1304 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1305 if (clazz_jh == NULL || results_jh == NULL) return -1;
1306 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1307
1308 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1309 if (results.is_null() || !results->is_objArray()) return -1;
1310
1311 TempNewSymbol name = NULL;
1312 TempNewSymbol sig = NULL;
1313 if (name_jh != NULL) {
1314 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1315 if (name == NULL) return 0; // a match is not possible
1316 }
1317 if (sig_jh != NULL) {
1318 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1319 if (sig == NULL) return 0; // a match is not possible
1320 }
1321
1322 Klass* caller = NULL;
1323 if (caller_jh != NULL) {
1324 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1325 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1326 caller = java_lang_Class::as_Klass(caller_oop);
1327 }
1328
1329 if (name != NULL && sig != NULL && results.not_null()) {
1330 // try a direct resolve
1331 // %%% TO DO
1332 }
1333
1334 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1335 caller, skip, results, CHECK_0);
1336 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1337 return res;
1338 }
1339 JVM_END
1340
1341 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1342 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1343 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1344 {
1345 // Walk all nmethods depending on this call site.
1346 MutexLocker mu(Compile_lock, thread);
1347 MethodHandles::flush_dependent_nmethods(call_site, target);
1348 java_lang_invoke_CallSite::set_target(call_site(), target());
1349 }
1350 }
1351 JVM_END
1352
1353 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1354 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1355 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1356 {
1357 // Walk all nmethods depending on this call site.
1358 MutexLocker mu(Compile_lock, thread);
1359 MethodHandles::flush_dependent_nmethods(call_site, target);
1360 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1361 }
1362 }
1363 JVM_END
1364
1365 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1366 jobject caller_jh, jintArray index_info_jh,
1367 jint start, jint end,
1368 jobjectArray buf_jh, jint pos,
1369 jboolean resolve, jobject ifna_jh)) {
1370 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1371 if (caller_k == NULL || !caller_k->is_instance_klass()) {
1372 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1373 }
1374 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1375 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1376 if (index_info_oop == NULL ||
1377 index_info_oop->klass() != Universe::intArrayKlassObj() ||
1378 typeArrayOop(index_info_oop)->length() < 2) {
1379 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1380 }
1381 typeArrayHandle index_info(THREAD, index_info_oop);
1382 int bss_index_in_pool = index_info->int_at(1);
1383 // While we are here, take a quick look at the index info:
1384 if (bss_index_in_pool <= 0 ||
1385 bss_index_in_pool >= caller->constants()->length() ||
1386 index_info->int_at(0)
1387 != caller->constants()->invoke_dynamic_argument_count_at(bss_index_in_pool)) {
1388 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1389 }
1390 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1391 if (start < 0) {
1392 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1393 if (start == pseudo_index) {
1394 if (start >= end || 0 > pos || pos >= buf->length()) break;
1395 oop pseudo_arg = NULL;
1396 switch (pseudo_index) {
1397 case -4: // bootstrap method
1398 {
1399 int bsm_index = caller->constants()->invoke_dynamic_bootstrap_method_ref_index_at(bss_index_in_pool);
1400 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1401 break;
1402 }
1403 case -3: // name
1404 {
1405 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool);
1406 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1407 pseudo_arg = str();
1408 break;
1409 }
1410 case -2: // type
1411 {
1412 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool);
1413 Handle th;
1414 if (type->byte_at(0) == '(') {
1415 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1416 } else {
1417 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1418 }
1419 pseudo_arg = th();
1420 break;
1421 }
1422 case -1: // argument count
1423 {
1424 int argc = caller->constants()->invoke_dynamic_argument_count_at(bss_index_in_pool);
1425 jvalue argc_value; argc_value.i = (jint)argc;
1426 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1427 break;
1428 }
1429 }
1430
1431 // Store the pseudo-argument, and advance the pointers.
1432 buf->obj_at_put(pos++, pseudo_arg);
1433 ++start;
1434 }
1435 }
1436 // When we are done with this there may be regular arguments to process too.
1437 }
1438 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1439 caller->constants()->
1440 copy_bootstrap_arguments_at(bss_index_in_pool,
1441 start, end, buf, pos,
1442 (resolve == JNI_TRUE), ifna, CHECK);
1443 }
1444 JVM_END
1445
1446 // It is called by a Cleaner object which ensures that dropped CallSites properly
1447 // deallocate their dependency information.
1448 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1449 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1450 {
1451 // Walk all nmethods depending on this call site.
1452 MutexLocker mu1(Compile_lock, thread);
1453
1454 int marked = 0;
1455 {
1456 NoSafepointVerifier nsv;
1457 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1458 assert(safe_to_expunge(), "removal is not safe");
1459 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1460 marked = deps.remove_all_dependents();
1461 }
1462 if (marked > 0) {
1463 // At least one nmethod has been marked for deoptimization
1464 VM_Deoptimize op;
1465 VMThread::execute(&op);
1466 }
1467 }
1468 }
1469 JVM_END
1470
1471 /**
1472 * Throws a java/lang/UnsupportedOperationException unconditionally.
1473 * This is required by the specification of MethodHandle.invoke if
1474 * invoked directly.
1475 */
1476 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1477 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1478 return NULL;
1479 }
1480 JVM_END
1481
1482 /**
1483 * Throws a java/lang/UnsupportedOperationException unconditionally.
1484 * This is required by the specification of MethodHandle.invokeExact if
1485 * invoked directly.
1486 */
1487 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1488 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1489 return NULL;
1490 }
1491 JVM_END
1492
1493 /// JVM_RegisterMethodHandleMethods
1494
1495 #undef CS // Solaris builds complain
1496
1497 #define LANG "Ljava/lang/"
1498 #define JLINV "Ljava/lang/invoke/"
1499
1500 #define OBJ LANG "Object;"
1501 #define CLS LANG "Class;"
1502 #define STRG LANG "String;"
1503 #define CS JLINV "CallSite;"
1504 #define MT JLINV "MethodType;"
1505 #define MH JLINV "MethodHandle;"
1506 #define MEM JLINV "MemberName;"
1507 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1508
1509 #define CC (char*) /*cast a literal from (const char*)*/
1510 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1511
1512 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1513 static JNINativeMethod MHN_methods[] = {
1514 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1515 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1516 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)},
1517 // static native int getNamedCon(int which, Object[] name)
1518 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1519 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1520 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1521 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1522 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1523 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1524 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1525 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1526 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1527 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1528 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1529 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1530 };
1531
1532 static JNINativeMethod MH_methods[] = {
1533 // UnsupportedOperationException throwers
1534 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1535 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1536 };
1537
1538 /**
1539 * This one function is exported, used by NativeLookup.
1540 */
1541 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1542 assert(!MethodHandles::enabled(), "must not be enabled");
1543 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1544
1545 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1546 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1547
1548 {
1549 ThreadToNativeFromVM ttnfv(thread);
1550
1551 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1552 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1553 "register java.lang.invoke.MethodHandleNative natives");
1554
1555 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1556 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1557 "register java.lang.invoke.MethodHandle natives");
1558 }
1559
1560 if (TraceInvokeDynamic) {
1561 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1562 }
1563
1564 MethodHandles::set_enabled(true);
1565 }
1566 JVM_END