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