1 /*
2 * Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/dependencyContext.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "interpreter/oopMapCache.hpp"
33 #include "interpreter/linkResolver.hpp"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "oops/objArrayOop.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "oops/typeArrayOop.inline.hpp"
40 #include "prims/methodHandles.hpp"
41 #include "runtime/compilationPolicy.hpp"
42 #include "runtime/interfaceSupport.inline.hpp"
43 #include "runtime/javaCalls.hpp"
44 #include "runtime/jniHandles.inline.hpp"
45 #include "runtime/timerTrace.hpp"
46 #include "runtime/reflection.hpp"
47 #include "runtime/safepointVerifiers.hpp"
48 #include "runtime/signature.hpp"
49 #include "runtime/stubRoutines.hpp"
50 #include "utilities/exceptions.hpp"
51
52
53 /*
54 * JSR 292 reference implementation: method handles
55 * The JDK 7 reference implementation represented method handle
56 * combinations as chains. Each link in the chain had a "vmentry"
57 * field which pointed at a bit of assembly code which performed
58 * one transformation before dispatching to the next link in the chain.
59 *
60 * The current reference implementation pushes almost all code generation
61 * responsibility to (trusted) Java code. A method handle contains a
62 * pointer to its "LambdaForm", which embodies all details of the method
63 * handle's behavior. The LambdaForm is a normal Java object, managed
64 * by a runtime coded in Java.
65 */
66
67 bool MethodHandles::_enabled = false; // set true after successful native linkage
68 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
69
70 /**
71 * Generates method handle adapters. Returns 'false' if memory allocation
72 * failed and true otherwise.
73 */
74 void MethodHandles::generate_adapters() {
75 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
76 assert(_adapter_code == NULL, "generate only once");
77
78 ResourceMark rm;
79 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
80 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
81 CodeBuffer code(_adapter_code);
82 MethodHandlesAdapterGenerator g(&code);
83 g.generate();
84 code.log_section_sizes("MethodHandlesAdapterBlob");
85 }
86
87 //------------------------------------------------------------------------------
88 // MethodHandlesAdapterGenerator::generate
89 //
90 void MethodHandlesAdapterGenerator::generate() {
91 // Generate generic method handle adapters.
92 // Generate interpreter entries
93 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
94 mk <= Interpreter::method_handle_invoke_LAST;
95 mk = Interpreter::MethodKind(1 + (int)mk)) {
96 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
97 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
98 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
99 if (entry != NULL) {
100 Interpreter::set_entry_for_kind(mk, entry);
101 }
102 // If the entry is not set, it will throw AbstractMethodError.
103 }
104 }
105
106 void MethodHandles::set_enabled(bool z) {
107 if (_enabled != z) {
108 guarantee(z, "can only enable once");
109 _enabled = z;
110 }
111 }
112
113 // MemberName support
114
115 // import java_lang_invoke_MemberName.*
116 enum {
117 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
118 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
119 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
120 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
121 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
122 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
123 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
124 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
125 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
126 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
127 };
128
129 int MethodHandles::ref_kind_to_flags(int ref_kind) {
130 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
131 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
132 if (ref_kind_is_field(ref_kind)) {
133 flags |= IS_FIELD;
134 } else if (ref_kind_is_method(ref_kind)) {
135 flags |= IS_METHOD;
136 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
137 flags |= IS_CONSTRUCTOR;
138 }
139 return flags;
140 }
141
142 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
143 Handle empty;
144 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
145 if (!java_lang_String::is_instance_inlined(type())) {
146 return type; // already resolved
147 }
148 Symbol* signature = java_lang_String::as_symbol_or_null(type());
149 if (signature == NULL) {
150 return empty; // no such signature exists in the VM
151 }
152 Handle resolved;
153 int flags = java_lang_invoke_MemberName::flags(mname());
154 switch (flags & ALL_KINDS) {
155 case IS_METHOD:
156 case IS_CONSTRUCTOR:
157 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
158 break;
159 case IS_FIELD:
160 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
161 break;
162 default:
163 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
164 }
165 if (resolved.is_null()) {
166 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
167 }
168 return resolved;
169 }
170
171 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
172 // This method is used from java.lang.invoke.MemberName constructors.
173 // It fills in the new MemberName from a java.lang.reflect.Member.
174 Thread* thread = Thread::current();
175 oop target_oop = target();
176 Klass* target_klass = target_oop->klass();
177 if (target_klass == SystemDictionary::reflect_Field_klass()) {
178 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
179 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
180 Klass* k = java_lang_Class::as_Klass(clazz);
181 if (k != NULL && k->is_instance_klass()) {
182 fieldDescriptor fd(InstanceKlass::cast(k), slot);
183 oop mname2 = init_field_MemberName(mname, fd);
184 if (mname2 != NULL) {
185 // Since we have the reified name and type handy, add them to the result.
186 if (java_lang_invoke_MemberName::name(mname2) == NULL)
187 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
188 if (java_lang_invoke_MemberName::type(mname2) == NULL)
189 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
190 }
191 return mname2;
192 }
193 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
194 oop clazz = java_lang_reflect_Method::clazz(target_oop);
195 int slot = java_lang_reflect_Method::slot(target_oop);
196 Klass* k = java_lang_Class::as_Klass(clazz);
197 if (k != NULL && k->is_instance_klass()) {
198 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
199 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
200 return NULL; // do not resolve unless there is a concrete signature
201 CallInfo info(m, k, CHECK_NULL);
202 return init_method_MemberName(mname, info);
203 }
204 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
205 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
206 int slot = java_lang_reflect_Constructor::slot(target_oop);
207 Klass* k = java_lang_Class::as_Klass(clazz);
208 if (k != NULL && k->is_instance_klass()) {
209 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
210 if (m == NULL) return NULL;
211 CallInfo info(m, k, CHECK_NULL);
212 return init_method_MemberName(mname, info);
213 }
214 }
215 return NULL;
216 }
217
218 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
219 assert(info.resolved_appendix().is_null(), "only normal methods here");
220 methodHandle m = info.resolved_method();
221 assert(m.not_null(), "null method handle");
222 Klass* m_klass = m->method_holder();
223 assert(m_klass != NULL, "null holder for method handle");
224 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
225 int vmindex = Method::invalid_vtable_index;
226
227 switch (info.call_kind()) {
228 case CallInfo::itable_call:
229 vmindex = info.itable_index();
230 // More importantly, the itable index only works with the method holder.
231 assert(m_klass->verify_itable_index(vmindex), "");
232 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
233 if (TraceInvokeDynamic) {
234 ttyLocker ttyl;
235 ResourceMark rm;
236 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
237 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
238 vmindex);
239 m->access_flags().print_on(tty);
240 if (!m->is_abstract()) {
241 if (!m->is_private()) {
242 tty->print("default");
243 }
244 else {
245 tty->print("private-intf");
246 }
247 }
248 tty->cr();
249 }
250 break;
251
252 case CallInfo::vtable_call:
253 vmindex = info.vtable_index();
254 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
255 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
256 if (m_klass->is_interface()) {
257 // This is a vtable call to an interface method (abstract "miranda method" or default method).
258 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
259 // (LinkResolver should help us figure this out.)
260 Klass* m_klass_non_interface = info.resolved_klass();
261 if (m_klass_non_interface->is_interface()) {
262 m_klass_non_interface = SystemDictionary::Object_klass();
263 #ifdef ASSERT
264 { ResourceMark rm;
265 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
266 assert(m->name() == m2->name() && m->signature() == m2->signature(),
267 "at %d, %s != %s", vmindex,
268 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
269 }
270 #endif //ASSERT
271 }
272 if (!m->is_public()) {
273 assert(m->is_public(), "virtual call must be to public interface method");
274 return NULL; // elicit an error later in product build
275 }
276 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
277 m_klass = m_klass_non_interface;
278 }
279 if (TraceInvokeDynamic) {
280 ttyLocker ttyl;
281 ResourceMark rm;
282 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
283 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
284 m_klass->internal_name(), vmindex);
285 m->access_flags().print_on(tty);
286 if (m->is_default_method()) {
287 tty->print("default");
288 }
289 tty->cr();
290 }
291 break;
292
293 case CallInfo::direct_call:
294 vmindex = Method::nonvirtual_vtable_index;
295 if (m->is_static()) {
296 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
297 } else if (m->is_initializer()) {
298 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
299 } else {
300 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
301 }
302 break;
303
304 default: assert(false, "bad CallInfo"); return NULL;
305 }
306
307 // @CallerSensitive annotation detected
308 if (m->caller_sensitive()) {
309 flags |= CALLER_SENSITIVE;
310 }
311
312 Handle resolved_method = info.resolved_method_name();
313 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m(),
314 "Should not change after link resolution");
315
316 oop mname_oop = mname();
317 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
318 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
319 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
320 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
321 // Note: name and type can be lazily computed by resolve_MemberName,
322 // if Java code needs them as resolved String and MethodType objects.
323 // If relevant, the vtable or itable value is stored as vmindex.
324 // This is done eagerly, since it is readily available without
325 // constructing any new objects.
326 return mname();
327 }
328
329 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
330 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
331 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
332 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
333 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
334
335 oop mname_oop = mname();
336 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
337 java_lang_invoke_MemberName::set_method (mname_oop, NULL);
338 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
339 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror());
340
341 oop type = field_signature_type_or_null(fd.signature());
342 oop name = field_name_or_null(fd.name());
343 if (name != NULL)
344 java_lang_invoke_MemberName::set_name(mname_oop, name);
345 if (type != NULL)
346 java_lang_invoke_MemberName::set_type(mname_oop, type);
347 // Note: name and type can be lazily computed by resolve_MemberName,
348 // if Java code needs them as resolved String and Class objects.
349 // Note that the incoming type oop might be pre-resolved (non-null).
350 // The base clazz and field offset (vmindex) must be eagerly stored,
351 // because they unambiguously identify the field.
352 // Although the fieldDescriptor::_index would also identify the field,
353 // we do not use it, because it is harder to decode.
354 // TO DO: maybe intern mname_oop
355 return mname();
356 }
357
358 // JVM 2.9 Special Methods:
359 // A method is signature polymorphic if and only if all of the following conditions hold :
360 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
361 // * It has a single formal parameter of type Object[].
362 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
363 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
364 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
365 if (klass == NULL)
366 return false;
367 // The following test will fail spuriously during bootstrap of MethodHandle itself:
368 // if (klass != SystemDictionary::MethodHandle_klass())
369 // Test the name instead:
370 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
371 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
372 return false;
373 }
374
375 // Look up signature polymorphic method with polymorphic return type
376 Symbol* poly_sig = vmSymbols::object_array_object_signature();
377 InstanceKlass* iklass = InstanceKlass::cast(klass);
378 Method* m = iklass->find_method(name, poly_sig);
379 if (m != NULL) {
380 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
381 int flags = m->access_flags().as_int();
382 if ((flags & required) == required) {
383 return true;
384 }
385 }
386
387 // Look up signature polymorphic method with non-polymorphic (non Object) return type
388 int me;
389 int ms = iklass->find_method_by_name(name, &me);
390 if (ms == -1) return false;
391 for (; ms < me; ms++) {
392 Method* m = iklass->methods()->at(ms);
393 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
394 int flags = m->access_flags().as_int();
395 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
396 return true;
397 }
398 }
399 return false;
400 }
401
402
403 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
404 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
405 switch (iid) {
406 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
407 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
408 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
409 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
410 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
411 default:
412 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
413 return 0;
414 }
415 }
416
417 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
418 switch(id) {
419 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
420 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
421 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
422 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
423 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
424 default:
425 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
426 return Bytecodes::_illegal;
427 }
428 }
429
430 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
431 switch (iid) {
432 case vmIntrinsics::_invokeBasic: return 0;
433 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
434 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
435 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
436 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
437 default:
438 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
439 return 0;
440 }
441 }
442
443 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
444 vmSymbols::SID name_id = vmSymbols::find_sid(name);
445 switch (name_id) {
446 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
447 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
448 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
449 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
450
451 // There is one static signature-polymorphic method for each JVM invocation mode.
452 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
453 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
454 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
455 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
456 default: break;
457 }
458
459 // Cover the case of invokeExact and any future variants of invokeFoo.
460 Klass* mh_klass = SystemDictionary::well_known_klass(
461 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
462 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
463 return vmIntrinsics::_invokeGeneric;
464 }
465
466 // Cover the case of methods on VarHandle.
467 Klass* vh_klass = SystemDictionary::well_known_klass(
468 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) );
469 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
470 return vmIntrinsics::_invokeGeneric;
471 }
472
473 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
474 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
475 return vmIntrinsics::_none;
476 }
477
478 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
479 if (klass != NULL &&
480 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
481 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
482 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
483 if (iid != vmIntrinsics::_none)
484 return iid;
485 if (is_method_handle_invoke_name(klass, name))
486 return vmIntrinsics::_invokeGeneric;
487 }
488 return vmIntrinsics::_none;
489 }
490
491
492 // convert the external string or reflective type to an internal signature
493 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
494 if (java_lang_invoke_MethodType::is_instance(type_str)) {
495 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
496 } else if (java_lang_Class::is_instance(type_str)) {
497 return java_lang_Class::as_signature(type_str, false, THREAD);
498 } else if (java_lang_String::is_instance_inlined(type_str)) {
499 if (intern_if_not_found) {
500 return java_lang_String::as_symbol(type_str, THREAD);
501 } else {
502 return java_lang_String::as_symbol_or_null(type_str);
503 }
504 } else {
505 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
506 }
507 }
508
509 static const char OBJ_SIG[] = "Ljava/lang/Object;";
510 enum { OBJ_SIG_LEN = 18 };
511
512 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
513 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
514 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
515 const int len = sig->utf8_length();
516 for (int i = 0; i < len; i++) {
517 switch (sig->byte_at(i)) {
518 case 'L':
519 // only java/lang/Object is valid here
520 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
521 return false;
522 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
523 continue;
524 case '(': case ')': case 'V':
525 case 'I': case 'J': case 'F': case 'D':
526 continue;
527 //case '[':
528 //case 'Z': case 'B': case 'C': case 'S':
529 default:
530 return false;
531 }
532 }
533 return true;
534 }
535
536 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
537 Symbol* bsig = NULL;
538 if (sig == NULL) {
539 return sig;
540 } else if (is_basic_type_signature(sig)) {
541 sig->increment_refcount();
542 return sig; // that was easy
543 } else if (sig->byte_at(0) != '(') {
544 BasicType bt = char2type(sig->byte_at(0));
545 if (is_subword_type(bt)) {
546 bsig = vmSymbols::int_signature();
547 } else {
548 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
549 bsig = vmSymbols::object_signature();
550 }
551 } else {
552 ResourceMark rm;
553 stringStream buffer(128);
554 buffer.put('(');
555 int arg_pos = 0, keep_arg_pos = -1;
556 if (keep_last_arg)
557 keep_arg_pos = ArgumentCount(sig).size() - 1;
558 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
559 BasicType bt = ss.type();
560 size_t this_arg_pos = buffer.size();
561 if (ss.at_return_type()) {
562 buffer.put(')');
563 }
564 if (arg_pos == keep_arg_pos) {
565 buffer.write((char*) ss.raw_bytes(),
566 (int) ss.raw_length());
567 } else if (bt == T_OBJECT || bt == T_ARRAY) {
568 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
569 } else {
570 if (is_subword_type(bt))
571 bt = T_INT;
572 buffer.put(type2char(bt));
573 }
574 arg_pos++;
575 }
576 const char* sigstr = buffer.base();
577 int siglen = (int) buffer.size();
578 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
579 }
580 assert(is_basic_type_signature(bsig) ||
581 // detune assert in case the injected argument is not a basic type:
582 keep_last_arg, "");
583 return bsig;
584 }
585
586 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
587 Symbol* sig,
588 bool keep_arrays,
589 bool keep_basic_names) {
590 st = st ? st : tty;
591 int len = sig->utf8_length();
592 int array = 0;
593 bool prev_type = false;
594 for (int i = 0; i < len; i++) {
595 char ch = sig->byte_at(i);
596 switch (ch) {
597 case '(': case ')':
598 prev_type = false;
599 st->put(ch);
600 continue;
601 case '[':
602 if (!keep_basic_names && keep_arrays)
603 st->put(ch);
604 array++;
605 continue;
606 case 'L':
607 {
608 if (prev_type) st->put(',');
609 int start = i+1, slash = start;
610 while (++i < len && (ch = sig->byte_at(i)) != ';') {
611 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
612 }
613 if (slash < i) start = slash;
614 if (!keep_basic_names) {
615 st->put('L');
616 } else {
617 for (int j = start; j < i; j++)
618 st->put(sig->byte_at(j));
619 prev_type = true;
620 }
621 break;
622 }
623 default:
624 {
625 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
626 ch = '[';
627 array = 0;
628 }
629 if (prev_type) st->put(',');
630 const char* n = NULL;
631 if (keep_basic_names)
632 n = type2name(char2type(ch));
633 if (n == NULL) {
634 // unknown letter, or we don't want to know its name
635 st->put(ch);
636 } else {
637 st->print("%s", n);
638 prev_type = true;
639 }
640 break;
641 }
642 }
643 // Switch break goes here to take care of array suffix:
644 if (prev_type) {
645 while (array > 0) {
646 st->print("[]");
647 --array;
648 }
649 }
650 array = 0;
651 }
652 }
653
654
655
656 static oop object_java_mirror() {
657 return SystemDictionary::Object_klass()->java_mirror();
658 }
659
660 oop MethodHandles::field_name_or_null(Symbol* s) {
661 if (s == NULL) return NULL;
662 return StringTable::lookup(s);
663 }
664
665 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
666 if (s == NULL) return NULL;
667 BasicType bt = FieldType::basic_type(s);
668 if (is_java_primitive(bt)) {
669 assert(s->utf8_length() == 1, "");
670 return java_lang_Class::primitive_mirror(bt);
671 }
672 // Here are some more short cuts for common types.
673 // They are optional, since reference types can be resolved lazily.
674 if (bt == T_OBJECT) {
675 if (s == vmSymbols::object_signature()) {
676 return object_java_mirror();
677 } else if (s == vmSymbols::class_signature()) {
678 return SystemDictionary::Class_klass()->java_mirror();
679 } else if (s == vmSymbols::string_signature()) {
680 return SystemDictionary::String_klass()->java_mirror();
681 }
682 }
683 return NULL;
684 }
685
686
687 // An unresolved member name is a mere symbolic reference.
688 // Resolving it plants a vmtarget/vmindex in it,
689 // which refers directly to JVM internals.
690 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller,
691 bool speculative_resolve, TRAPS) {
692 Handle empty;
693 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
694
695 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
696 // Already resolved.
697 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
698 assert(vmindex >= Method::nonvirtual_vtable_index, "");
699 return mname;
700 }
701
702 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
703 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
704 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
705 int flags = java_lang_invoke_MemberName::flags(mname());
706 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
707 if (!ref_kind_is_valid(ref_kind)) {
708 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
709 }
710
711 DEBUG_ONLY(int old_vmindex);
712 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
713
714 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
715 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
716 }
717
718 InstanceKlass* defc = NULL;
719 {
720 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
721 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
722 if (!defc_klass->is_instance_klass()) {
723 if (!defc_klass->is_array_klass()) return empty;
724 defc_klass = SystemDictionary::Object_klass();
725 }
726 defc = InstanceKlass::cast(defc_klass);
727 }
728 if (defc == NULL) {
729 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
730 }
731 defc->link_class(CHECK_(empty)); // possible safepoint
732
733 // convert the external string name to an internal symbol
734 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
735 if (name == NULL) return empty; // no such name
736 if (name == vmSymbols::class_initializer_name())
737 return empty; // illegal name
738
739 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
740 if ((flags & ALL_KINDS) == IS_METHOD &&
741 (defc == SystemDictionary::MethodHandle_klass()) &&
742 (ref_kind == JVM_REF_invokeVirtual ||
743 ref_kind == JVM_REF_invokeSpecial ||
744 // static invocation mode is required for _linkToVirtual, etc.:
745 ref_kind == JVM_REF_invokeStatic)) {
746 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
747 if (iid != vmIntrinsics::_none &&
748 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
749 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
750 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
751 mh_invoke_id = iid;
752 }
753 }
754
755 // convert the external string or reflective type to an internal signature
756 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
757 if (type == NULL) return empty; // no such signature exists in the VM
758
759 LinkInfo::AccessCheck access_check = caller != NULL ?
760 LinkInfo::needs_access_check :
761 LinkInfo::skip_access_check;
762
763 // Time to do the lookup.
764 switch (flags & ALL_KINDS) {
765 case IS_METHOD:
766 {
767 CallInfo result;
768 LinkInfo link_info(defc, name, type, caller, access_check);
769 {
770 assert(!HAS_PENDING_EXCEPTION, "");
771 if (ref_kind == JVM_REF_invokeStatic) {
772 LinkResolver::resolve_static_call(result,
773 link_info, false, THREAD);
774 } else if (ref_kind == JVM_REF_invokeInterface) {
775 LinkResolver::resolve_interface_call(result, Handle(), defc,
776 link_info, false, THREAD);
777 } else if (mh_invoke_id != vmIntrinsics::_none) {
778 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
779 LinkResolver::resolve_handle_call(result, link_info, THREAD);
780 } else if (ref_kind == JVM_REF_invokeSpecial) {
781 LinkResolver::resolve_special_call(result, Handle(),
782 link_info, THREAD);
783 } else if (ref_kind == JVM_REF_invokeVirtual) {
784 LinkResolver::resolve_virtual_call(result, Handle(), defc,
785 link_info, false, THREAD);
786 } else {
787 assert(false, "ref_kind=%d", ref_kind);
788 }
789 if (HAS_PENDING_EXCEPTION) {
790 if (speculative_resolve) {
791 CLEAR_PENDING_EXCEPTION;
792 }
793 return empty;
794 }
795 }
796 if (result.resolved_appendix().not_null()) {
797 // The resolved MemberName must not be accompanied by an appendix argument,
798 // since there is no way to bind this value into the MemberName.
799 // Caller is responsible to prevent this from happening.
800 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
801 }
802 result.set_resolved_method_name(CHECK_(empty));
803 oop mname2 = init_method_MemberName(mname, result);
804 return Handle(THREAD, mname2);
805 }
806 case IS_CONSTRUCTOR:
807 {
808 CallInfo result;
809 LinkInfo link_info(defc, name, type, caller, access_check);
810 {
811 assert(!HAS_PENDING_EXCEPTION, "");
812 if (name == vmSymbols::object_initializer_name()) {
813 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
814 } else {
815 break; // will throw after end of switch
816 }
817 if (HAS_PENDING_EXCEPTION) {
818 if (speculative_resolve) {
819 CLEAR_PENDING_EXCEPTION;
820 }
821 return empty;
822 }
823 }
824 assert(result.is_statically_bound(), "");
825 result.set_resolved_method_name(CHECK_(empty));
826 oop mname2 = init_method_MemberName(mname, result);
827 return Handle(THREAD, mname2);
828 }
829 case IS_FIELD:
830 {
831 fieldDescriptor result; // find_field initializes fd if found
832 {
833 assert(!HAS_PENDING_EXCEPTION, "");
834 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
835 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
836 if (HAS_PENDING_EXCEPTION) {
837 if (speculative_resolve) {
838 CLEAR_PENDING_EXCEPTION;
839 }
840 return empty;
841 }
842 }
843 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
844 return Handle(THREAD, mname2);
845 }
846 default:
847 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
848 }
849
850 return empty;
851 }
852
853 // Conversely, a member name which is only initialized from JVM internals
854 // may have null defc, name, and type fields.
855 // Resolving it plants a vmtarget/vmindex in it,
856 // which refers directly to JVM internals.
857 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
858 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
859
860 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
861 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
862 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
863 int flags = java_lang_invoke_MemberName::flags(mname());
864
865 if (suppress != 0) {
866 if (suppress & _suppress_defc) have_defc = true;
867 if (suppress & _suppress_name) have_name = true;
868 if (suppress & _suppress_type) have_type = true;
869 }
870
871 if (have_defc && have_name && have_type) return; // nothing needed
872
873 switch (flags & ALL_KINDS) {
874 case IS_METHOD:
875 case IS_CONSTRUCTOR:
876 {
877 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
878 if (vmtarget == NULL) {
879 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
880 }
881 methodHandle m(THREAD, vmtarget);
882 DEBUG_ONLY(vmtarget = NULL); // safety
883 if (!have_defc) {
884 InstanceKlass* defc = m->method_holder();
885 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
886 }
887 if (!have_name) {
888 //not java_lang_String::create_from_symbol; let's intern member names
889 oop name = StringTable::intern(m->name(), CHECK);
890 java_lang_invoke_MemberName::set_name(mname(), name);
891 }
892 if (!have_type) {
893 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
894 java_lang_invoke_MemberName::set_type(mname(), type());
895 }
896 return;
897 }
898 case IS_FIELD:
899 {
900 oop clazz = java_lang_invoke_MemberName::clazz(mname());
901 if (clazz == NULL) {
902 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
903 }
904 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
905 DEBUG_ONLY(clazz = NULL); // safety
906 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
907 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
908 fieldDescriptor fd; // find_field initializes fd if found
909 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
910 break; // cannot expand
911 if (!have_name) {
912 //not java_lang_String::create_from_symbol; let's intern member names
913 oop name = StringTable::intern(fd.name(), CHECK);
914 java_lang_invoke_MemberName::set_name(mname(), name);
915 }
916 if (!have_type) {
917 // If it is a primitive field type, don't mess with short strings like "I".
918 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
919 if (type.is_null()) {
920 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
921 }
922 java_lang_invoke_MemberName::set_type(mname(), type());
923 }
924 return;
925 }
926 }
927 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
928 }
929
930 int MethodHandles::find_MemberNames(Klass* k,
931 Symbol* name, Symbol* sig,
932 int mflags, Klass* caller,
933 int skip, objArrayHandle results, TRAPS) {
934 // %%% take caller into account!
935
936 Thread* thread = Thread::current();
937
938 if (k == NULL || !k->is_instance_klass()) return -1;
939
940 int rfill = 0, rlimit = results->length(), rskip = skip;
941 // overflow measurement:
942 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
943
944 int match_flags = mflags;
945 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
946 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
947 bool local_only = !(search_superc | search_intfc);
948 bool classes_only = false;
949
950 if (name != NULL) {
951 if (name->utf8_length() == 0) return 0; // a match is not possible
952 }
953 if (sig != NULL) {
954 if (sig->utf8_length() == 0) return 0; // a match is not possible
955 if (sig->byte_at(0) == '(')
956 match_flags &= ~(IS_FIELD | IS_TYPE);
957 else
958 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
959 }
960
961 if ((match_flags & IS_TYPE) != 0) {
962 // NYI, and Core Reflection works quite well for this query
963 }
964
965 if ((match_flags & IS_FIELD) != 0) {
966 InstanceKlass* ik = InstanceKlass::cast(k);
967 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
968 if (name != NULL && st.name() != name)
969 continue;
970 if (sig != NULL && st.signature() != sig)
971 continue;
972 // passed the filters
973 if (rskip > 0) {
974 --rskip;
975 } else if (rfill < rlimit) {
976 Handle result(thread, results->obj_at(rfill++));
977 if (!java_lang_invoke_MemberName::is_instance(result()))
978 return -99; // caller bug!
979 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
980 if (!oopDesc::equals(saved, result()))
981 results->obj_at_put(rfill-1, saved); // show saved instance to user
982 } else if (++overflow >= overflow_limit) {
983 match_flags = 0; break; // got tired of looking at overflow
984 }
985 }
986 }
987
988 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
989 // watch out for these guys:
990 Symbol* init_name = vmSymbols::object_initializer_name();
991 Symbol* clinit_name = vmSymbols::class_initializer_name();
992 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
993 bool negate_name_test = false;
994 // fix name so that it captures the intention of IS_CONSTRUCTOR
995 if (!(match_flags & IS_METHOD)) {
996 // constructors only
997 if (name == NULL) {
998 name = init_name;
999 } else if (name != init_name) {
1000 return 0; // no constructors of this method name
1001 }
1002 } else if (!(match_flags & IS_CONSTRUCTOR)) {
1003 // methods only
1004 if (name == NULL) {
1005 name = init_name;
1006 negate_name_test = true; // if we see the name, we *omit* the entry
1007 } else if (name == init_name) {
1008 return 0; // no methods of this constructor name
1009 }
1010 } else {
1011 // caller will accept either sort; no need to adjust name
1012 }
1013 InstanceKlass* ik = InstanceKlass::cast(k);
1014 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
1015 Method* m = st.method();
1016 Symbol* m_name = m->name();
1017 if (m_name == clinit_name)
1018 continue;
1019 if (name != NULL && ((m_name != name) ^ negate_name_test))
1020 continue;
1021 if (sig != NULL && m->signature() != sig)
1022 continue;
1023 // passed the filters
1024 if (rskip > 0) {
1025 --rskip;
1026 } else if (rfill < rlimit) {
1027 Handle result(thread, results->obj_at(rfill++));
1028 if (!java_lang_invoke_MemberName::is_instance(result()))
1029 return -99; // caller bug!
1030 CallInfo info(m, NULL, CHECK_0);
1031 oop saved = MethodHandles::init_method_MemberName(result, info);
1032 if (!oopDesc::equals(saved, result()))
1033 results->obj_at_put(rfill-1, saved); // show saved instance to user
1034 } else if (++overflow >= overflow_limit) {
1035 match_flags = 0; break; // got tired of looking at overflow
1036 }
1037 }
1038 }
1039
1040 // return number of elements we at leasted wanted to initialize
1041 return rfill + overflow;
1042 }
1043
1044 // Is it safe to remove stale entries from a dependency list?
1045 static bool safe_to_expunge() {
1046 // Since parallel GC threads can concurrently iterate over a dependency
1047 // list during safepoint, it is safe to remove entries only when
1048 // CodeCache lock is held.
1049 return CodeCache_lock->owned_by_self();
1050 }
1051
1052 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
1053 assert_locked_or_safepoint(CodeCache_lock);
1054
1055 oop context = java_lang_invoke_CallSite::context(call_site);
1056 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1057 // Try to purge stale entries on updates.
1058 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
1059 // in order to avoid memory leak, stale entries are purged whenever a dependency list
1060 // is changed (both on addition and removal). Though memory reclamation is delayed,
1061 // it avoids indefinite memory usage growth.
1062 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
1063 }
1064
1065 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
1066 assert_locked_or_safepoint(CodeCache_lock);
1067
1068 oop context = java_lang_invoke_CallSite::context(call_site);
1069 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1070 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
1071 }
1072
1073 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
1074 assert_lock_strong(Compile_lock);
1075
1076 int marked = 0;
1077 CallSiteDepChange changes(call_site, target);
1078 {
1079 NoSafepointVerifier nsv;
1080 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1081
1082 oop context = java_lang_invoke_CallSite::context(call_site());
1083 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1084 marked = deps.mark_dependent_nmethods(changes);
1085 }
1086 if (marked > 0) {
1087 // At least one nmethod has been marked for deoptimization.
1088 VM_Deoptimize op;
1089 VMThread::execute(&op);
1090 }
1091 }
1092
1093 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
1094 if (TraceMethodHandles) {
1095 const char* name = vmIntrinsics::name_at(iid);
1096 if (*name == '_') name += 1;
1097 const size_t len = strlen(name) + 50;
1098 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
1099 const char* suffix = "";
1100 if (is_signature_polymorphic(iid)) {
1101 if (is_signature_polymorphic_static(iid))
1102 suffix = "/static";
1103 else
1104 suffix = "/private";
1105 }
1106 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
1107 trace_method_handle(_masm, qname);
1108 // Note: Don't free the allocated char array because it's used
1109 // during runtime.
1110 }
1111 }
1112
1113 //
1114 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1115 // They are the private interface between this JVM and the HotSpot-specific
1116 // Java code that implements JSR 292 method handles.
1117 //
1118 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1119 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1120 //
1121
1122 #ifndef PRODUCT
1123 #define EACH_NAMED_CON(template, requirement) \
1124 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1125 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1126 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1127 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1128 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1129 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1130 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1131 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1132 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1133 /*end*/
1134
1135 #define IGNORE_REQ(req_expr) /* req_expr */
1136 #define ONE_PLUS(scope,value) 1+
1137 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1138 #define VALUE_COMMA(scope,value) scope::value,
1139 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1140 #define STRING_NULL(scope,value) #value "\0"
1141 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1142
1143 static bool advertise_con_value(int which) {
1144 if (which < 0) return false;
1145 bool ok = true;
1146 int count = 0;
1147 #define INC_COUNT(scope,value) \
1148 ++count;
1149 #define CHECK_REQ(req_expr) \
1150 if (which < count) return ok; \
1151 ok = (req_expr);
1152 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1153 #undef INC_COUNT
1154 #undef CHECK_REQ
1155 assert(count == con_value_count, "");
1156 if (which < count) return ok;
1157 return false;
1158 }
1159
1160 #undef ONE_PLUS
1161 #undef VALUE_COMMA
1162 #undef STRING_NULL
1163 #undef EACH_NAMED_CON
1164 #endif // PRODUCT
1165
1166 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1167 #ifndef PRODUCT
1168 if (advertise_con_value(which)) {
1169 assert(which >= 0 && which < con_value_count, "");
1170 int con = con_values[which];
1171 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1172 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1173 const char* str = &con_names[0];
1174 for (int i = 0; i < which; i++)
1175 str += strlen(str) + 1; // skip name and null
1176 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1177 box->obj_at_put(0, name);
1178 }
1179 return con;
1180 }
1181 #endif
1182 return 0;
1183 }
1184 JVM_END
1185
1186 // void init(MemberName self, AccessibleObject ref)
1187 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1188 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1189 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1190 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1191 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1192 MethodHandles::init_MemberName(mname, target, CHECK);
1193 }
1194 JVM_END
1195
1196 // void expand(MemberName self)
1197 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1198 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1199 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1200 MethodHandles::expand_MemberName(mname, 0, CHECK);
1201 }
1202 JVM_END
1203
1204 // void resolve(MemberName self, Class<?> caller)
1205 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1206 jboolean speculative_resolve)) {
1207 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1208 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1209
1210 // The trusted Java code that calls this method should already have performed
1211 // access checks on behalf of the given caller. But, we can verify this.
1212 if (VerifyMethodHandles && caller_jh != NULL &&
1213 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1214 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1215 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1216 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1217 }
1218
1219 // Reflection::verify_class_access can only handle instance classes.
1220 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1221 // Emulate LinkResolver::check_klass_accessability.
1222 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1223 if (caller != SystemDictionary::Object_klass()
1224 && Reflection::verify_class_access(caller,
1225 InstanceKlass::cast(reference_klass),
1226 true) != Reflection::ACCESS_OK) {
1227 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1228 }
1229 }
1230 }
1231
1232 Klass* caller = caller_jh == NULL ? NULL :
1233 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1234 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, speculative_resolve == JNI_TRUE,
1235 CHECK_NULL);
1236
1237 if (resolved.is_null()) {
1238 int flags = java_lang_invoke_MemberName::flags(mname());
1239 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1240 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1241 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1242 }
1243 if (speculative_resolve) {
1244 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1245 return NULL;
1246 }
1247 if ((flags & ALL_KINDS) == IS_FIELD) {
1248 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1249 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1250 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1251 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1252 } else {
1253 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1254 }
1255 }
1256
1257 return JNIHandles::make_local(THREAD, resolved());
1258 }
1259 JVM_END
1260
1261 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1262 if (mname == NULL ||
1263 java_lang_invoke_MemberName::clazz(mname) == NULL) {
1264 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1265 } else {
1266 int flags = java_lang_invoke_MemberName::flags(mname);
1267 if ((flags & IS_FIELD) != 0 &&
1268 (must_be_static
1269 ? (flags & JVM_ACC_STATIC) != 0
1270 : (flags & JVM_ACC_STATIC) == 0)) {
1271 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1272 return (jlong) vmindex;
1273 }
1274 }
1275 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1276 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1277 return 0;
1278 }
1279
1280 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1281 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1282 }
1283 JVM_END
1284
1285 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1286 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1287 }
1288 JVM_END
1289
1290 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1291 // use the other function to perform sanity checks:
1292 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1293 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1294 return JNIHandles::make_local(THREAD, clazz);
1295 }
1296 JVM_END
1297
1298 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1299 if (mname_jh == NULL) return NULL;
1300 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1301 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1302 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1303 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1304 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1305 result->obj_at_put(0, x);
1306
1307 int flags = java_lang_invoke_MemberName::flags(mname());
1308 if ((flags & IS_FIELD) != 0) {
1309 x = java_lang_invoke_MemberName::clazz(mname());
1310 } else {
1311 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1312 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1313 x = mname();
1314 }
1315 result->obj_at_put(1, x);
1316 return JNIHandles::make_local(env, result());
1317 }
1318 JVM_END
1319
1320
1321
1322 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1323 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1324 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1325 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1326 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1327 if (clazz_jh == NULL || results_jh == NULL) return -1;
1328 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1329
1330 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1331 if (results.is_null() || !results->is_objArray()) return -1;
1332
1333 TempNewSymbol name = NULL;
1334 TempNewSymbol sig = NULL;
1335 if (name_jh != NULL) {
1336 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1337 if (name == NULL) return 0; // a match is not possible
1338 }
1339 if (sig_jh != NULL) {
1340 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1341 if (sig == NULL) return 0; // a match is not possible
1342 }
1343
1344 Klass* caller = NULL;
1345 if (caller_jh != NULL) {
1346 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1347 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1348 caller = java_lang_Class::as_Klass(caller_oop);
1349 }
1350
1351 if (name != NULL && sig != NULL && results.not_null()) {
1352 // try a direct resolve
1353 // %%% TO DO
1354 }
1355
1356 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1357 caller, skip, results, CHECK_0);
1358 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1359 return res;
1360 }
1361 JVM_END
1362
1363 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1364 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1365 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1366 {
1367 // Walk all nmethods depending on this call site.
1368 MutexLocker mu(Compile_lock, thread);
1369 MethodHandles::flush_dependent_nmethods(call_site, target);
1370 java_lang_invoke_CallSite::set_target(call_site(), target());
1371 }
1372 }
1373 JVM_END
1374
1375 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1376 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1377 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1378 {
1379 // Walk all nmethods depending on this call site.
1380 MutexLocker mu(Compile_lock, thread);
1381 MethodHandles::flush_dependent_nmethods(call_site, target);
1382 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1383 }
1384 }
1385 JVM_END
1386
1387 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1388 jobject caller_jh, jintArray index_info_jh,
1389 jint start, jint end,
1390 jobjectArray buf_jh, jint pos,
1391 jboolean resolve, jobject ifna_jh)) {
1392 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1393 if (caller_k == NULL || !caller_k->is_instance_klass()) {
1394 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1395 }
1396 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1397 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1398 if (index_info_oop == NULL ||
1399 index_info_oop->klass() != Universe::intArrayKlassObj() ||
1400 typeArrayOop(index_info_oop)->length() < 2) {
1401 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1402 }
1403 typeArrayHandle index_info(THREAD, index_info_oop);
1404 int bss_index_in_pool = index_info->int_at(1);
1405 // While we are here, take a quick look at the index info:
1406 if (bss_index_in_pool <= 0 ||
1407 bss_index_in_pool >= caller->constants()->length() ||
1408 index_info->int_at(0)
1409 != caller->constants()->invoke_dynamic_argument_count_at(bss_index_in_pool)) {
1410 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1411 }
1412 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1413 if (start < 0) {
1414 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1415 if (start == pseudo_index) {
1416 if (start >= end || 0 > pos || pos >= buf->length()) break;
1417 oop pseudo_arg = NULL;
1418 switch (pseudo_index) {
1419 case -4: // bootstrap method
1420 {
1421 int bsm_index = caller->constants()->invoke_dynamic_bootstrap_method_ref_index_at(bss_index_in_pool);
1422 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1423 break;
1424 }
1425 case -3: // name
1426 {
1427 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool);
1428 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1429 pseudo_arg = str();
1430 break;
1431 }
1432 case -2: // type
1433 {
1434 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool);
1435 Handle th;
1436 if (type->byte_at(0) == '(') {
1437 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1438 } else {
1439 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1440 }
1441 pseudo_arg = th();
1442 break;
1443 }
1444 case -1: // argument count
1445 {
1446 int argc = caller->constants()->invoke_dynamic_argument_count_at(bss_index_in_pool);
1447 jvalue argc_value; argc_value.i = (jint)argc;
1448 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1449 break;
1450 }
1451 }
1452
1453 // Store the pseudo-argument, and advance the pointers.
1454 buf->obj_at_put(pos++, pseudo_arg);
1455 ++start;
1456 }
1457 }
1458 // When we are done with this there may be regular arguments to process too.
1459 }
1460 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1461 caller->constants()->
1462 copy_bootstrap_arguments_at(bss_index_in_pool,
1463 start, end, buf, pos,
1464 (resolve == JNI_TRUE), ifna, CHECK);
1465 }
1466 JVM_END
1467
1468 // It is called by a Cleaner object which ensures that dropped CallSites properly
1469 // deallocate their dependency information.
1470 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1471 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1472 {
1473 // Walk all nmethods depending on this call site.
1474 MutexLocker mu1(Compile_lock, thread);
1475
1476 int marked = 0;
1477 {
1478 NoSafepointVerifier nsv;
1479 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1480 assert(safe_to_expunge(), "removal is not safe");
1481 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1482 marked = deps.remove_all_dependents();
1483 }
1484 if (marked > 0) {
1485 // At least one nmethod has been marked for deoptimization
1486 VM_Deoptimize op;
1487 VMThread::execute(&op);
1488 }
1489 }
1490 }
1491 JVM_END
1492
1493 /**
1494 * Throws a java/lang/UnsupportedOperationException unconditionally.
1495 * This is required by the specification of MethodHandle.invoke if
1496 * invoked directly.
1497 */
1498 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1499 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1500 return NULL;
1501 }
1502 JVM_END
1503
1504 /**
1505 * Throws a java/lang/UnsupportedOperationException unconditionally.
1506 * This is required by the specification of MethodHandle.invokeExact if
1507 * invoked directly.
1508 */
1509 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1510 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1511 return NULL;
1512 }
1513 JVM_END
1514
1515 /// JVM_RegisterMethodHandleMethods
1516
1517 #undef CS // Solaris builds complain
1518
1519 #define LANG "Ljava/lang/"
1520 #define JLINV "Ljava/lang/invoke/"
1521
1522 #define OBJ LANG "Object;"
1523 #define CLS LANG "Class;"
1524 #define STRG LANG "String;"
1525 #define CS JLINV "CallSite;"
1526 #define MT JLINV "MethodType;"
1527 #define MH JLINV "MethodHandle;"
1528 #define MEM JLINV "MemberName;"
1529 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1530
1531 #define CC (char*) /*cast a literal from (const char*)*/
1532 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1533
1534 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1535 static JNINativeMethod MHN_methods[] = {
1536 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1537 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1538 {CC "resolve", CC "(" MEM "" CLS "Z)" MEM, FN_PTR(MHN_resolve_Mem)},
1539 // static native int getNamedCon(int which, Object[] name)
1540 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1541 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1542 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1543 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1544 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1545 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1546 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1547 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1548 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1549 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1550 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1551 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1552 };
1553
1554 static JNINativeMethod MH_methods[] = {
1555 // UnsupportedOperationException throwers
1556 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1557 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1558 };
1559
1560 /**
1561 * This one function is exported, used by NativeLookup.
1562 */
1563 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1564 assert(!MethodHandles::enabled(), "must not be enabled");
1565 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1566
1567 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1568 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1569
1570 {
1571 ThreadToNativeFromVM ttnfv(thread);
1572
1573 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1574 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1575 "register java.lang.invoke.MethodHandleNative natives");
1576
1577 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1578 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1579 "register java.lang.invoke.MethodHandle natives");
1580 }
1581
1582 if (TraceInvokeDynamic) {
1583 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1584 }
1585
1586 MethodHandles::set_enabled(true);
1587 }
1588 JVM_END