1/*
2 * Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "classfile/javaClasses.inline.hpp"
27#include "classfile/stringTable.hpp"
28#include "classfile/symbolTable.hpp"
29#include "code/codeCache.hpp"
30#include "code/dependencyContext.hpp"
31#include "compiler/compileBroker.hpp"
32#include "interpreter/interpreter.hpp"
33#include "interpreter/oopMapCache.hpp"
34#include "interpreter/linkResolver.hpp"
35#include "memory/allocation.inline.hpp"
36#include "memory/oopFactory.hpp"
37#include "memory/resourceArea.hpp"
38#include "memory/universe.hpp"
39#include "oops/objArrayKlass.hpp"
40#include "oops/objArrayOop.inline.hpp"
41#include "oops/oop.inline.hpp"
42#include "oops/typeArrayOop.inline.hpp"
43#include "prims/methodHandles.hpp"
44#include "runtime/compilationPolicy.hpp"
45#include "runtime/fieldDescriptor.inline.hpp"
46#include "runtime/handles.inline.hpp"
47#include "runtime/interfaceSupport.inline.hpp"
48#include "runtime/javaCalls.hpp"
49#include "runtime/jniHandles.inline.hpp"
50#include "runtime/timerTrace.hpp"
51#include "runtime/reflection.hpp"
52#include "runtime/safepointVerifiers.hpp"
53#include "runtime/signature.hpp"
54#include "runtime/stubRoutines.hpp"
55#include "utilities/exceptions.hpp"
56
57
58/*
59 * JSR 292 reference implementation: method handles
60 * The JDK 7 reference implementation represented method handle
61 * combinations as chains. Each link in the chain had a "vmentry"
62 * field which pointed at a bit of assembly code which performed
63 * one transformation before dispatching to the next link in the chain.
64 *
65 * The current reference implementation pushes almost all code generation
66 * responsibility to (trusted) Java code. A method handle contains a
67 * pointer to its "LambdaForm", which embodies all details of the method
68 * handle's behavior. The LambdaForm is a normal Java object, managed
69 * by a runtime coded in Java.
70 */
71
72bool MethodHandles::_enabled = false; // set true after successful native linkage
73MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
74
75/**
76 * Generates method handle adapters. Returns 'false' if memory allocation
77 * failed and true otherwise.
78 */
79void MethodHandles::generate_adapters() {
80 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
81 assert(_adapter_code == NULL, "generate only once");
82
83 ResourceMark rm;
84 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
85 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
86 CodeBuffer code(_adapter_code);
87 MethodHandlesAdapterGenerator g(&code);
88 g.generate();
89 code.log_section_sizes("MethodHandlesAdapterBlob");
90}
91
92//------------------------------------------------------------------------------
93// MethodHandlesAdapterGenerator::generate
94//
95void MethodHandlesAdapterGenerator::generate() {
96 // Generate generic method handle adapters.
97 // Generate interpreter entries
98 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
99 mk <= Interpreter::method_handle_invoke_LAST;
100 mk = Interpreter::MethodKind(1 + (int)mk)) {
101 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
102 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
103 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
104 if (entry != NULL) {
105 Interpreter::set_entry_for_kind(mk, entry);
106 }
107 // If the entry is not set, it will throw AbstractMethodError.
108 }
109}
110
111void MethodHandles::set_enabled(bool z) {
112 if (_enabled != z) {
113 guarantee(z, "can only enable once");
114 _enabled = z;
115 }
116}
117
118// MemberName support
119
120// import java_lang_invoke_MemberName.*
121enum {
122 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
123 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
124 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
125 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
126 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
127 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
128 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
129 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
130 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
131 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
132};
133
134int MethodHandles::ref_kind_to_flags(int ref_kind) {
135 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
136 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
137 if (ref_kind_is_field(ref_kind)) {
138 flags |= IS_FIELD;
139 } else if (ref_kind_is_method(ref_kind)) {
140 flags |= IS_METHOD;
141 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
142 flags |= IS_CONSTRUCTOR;
143 }
144 return flags;
145}
146
147Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
148 Handle empty;
149 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
150 if (!java_lang_String::is_instance_inlined(type())) {
151 return type; // already resolved
152 }
153 Symbol* signature = java_lang_String::as_symbol_or_null(type());
154 if (signature == NULL) {
155 return empty; // no such signature exists in the VM
156 }
157 Handle resolved;
158 int flags = java_lang_invoke_MemberName::flags(mname());
159 switch (flags & ALL_KINDS) {
160 case IS_METHOD:
161 case IS_CONSTRUCTOR:
162 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
163 break;
164 case IS_FIELD:
165 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
166 break;
167 default:
168 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
169 }
170 if (resolved.is_null()) {
171 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
172 }
173 return resolved;
174}
175
176oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
177 // This method is used from java.lang.invoke.MemberName constructors.
178 // It fills in the new MemberName from a java.lang.reflect.Member.
179 Thread* thread = Thread::current();
180 oop target_oop = target();
181 Klass* target_klass = target_oop->klass();
182 if (target_klass == SystemDictionary::reflect_Field_klass()) {
183 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
184 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
185 Klass* k = java_lang_Class::as_Klass(clazz);
186 if (k != NULL && k->is_instance_klass()) {
187 fieldDescriptor fd(InstanceKlass::cast(k), slot);
188 oop mname2 = init_field_MemberName(mname, fd);
189 if (mname2 != NULL) {
190 // Since we have the reified name and type handy, add them to the result.
191 if (java_lang_invoke_MemberName::name(mname2) == NULL)
192 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
193 if (java_lang_invoke_MemberName::type(mname2) == NULL)
194 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
195 }
196 return mname2;
197 }
198 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
199 oop clazz = java_lang_reflect_Method::clazz(target_oop);
200 int slot = java_lang_reflect_Method::slot(target_oop);
201 Klass* k = java_lang_Class::as_Klass(clazz);
202 if (k != NULL && k->is_instance_klass()) {
203 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
204 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
205 return NULL; // do not resolve unless there is a concrete signature
206 CallInfo info(m, k, CHECK_NULL);
207 return init_method_MemberName(mname, info);
208 }
209 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
210 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
211 int slot = java_lang_reflect_Constructor::slot(target_oop);
212 Klass* k = java_lang_Class::as_Klass(clazz);
213 if (k != NULL && k->is_instance_klass()) {
214 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
215 if (m == NULL) return NULL;
216 CallInfo info(m, k, CHECK_NULL);
217 return init_method_MemberName(mname, info);
218 }
219 }
220 return NULL;
221}
222
223oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
224 assert(info.resolved_appendix().is_null(), "only normal methods here");
225 methodHandle m = info.resolved_method();
226 assert(m.not_null(), "null method handle");
227 InstanceKlass* m_klass = m->method_holder();
228 assert(m_klass != NULL, "null holder for method handle");
229 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
230 int vmindex = Method::invalid_vtable_index;
231
232 switch (info.call_kind()) {
233 case CallInfo::itable_call:
234 vmindex = info.itable_index();
235 // More importantly, the itable index only works with the method holder.
236 assert(m_klass->verify_itable_index(vmindex), "");
237 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
238 if (TraceInvokeDynamic) {
239 ttyLocker ttyl;
240 ResourceMark rm;
241 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
242 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
243 vmindex);
244 m->access_flags().print_on(tty);
245 if (!m->is_abstract()) {
246 if (!m->is_private()) {
247 tty->print("default");
248 }
249 else {
250 tty->print("private-intf");
251 }
252 }
253 tty->cr();
254 }
255 break;
256
257 case CallInfo::vtable_call:
258 vmindex = info.vtable_index();
259 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
260 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
261 if (m_klass->is_interface()) {
262 // This is a vtable call to an interface method (abstract "miranda method" or default method).
263 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
264 // (LinkResolver should help us figure this out.)
265 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass");
266 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass());
267 if (m_klass_non_interface->is_interface()) {
268 m_klass_non_interface = SystemDictionary::Object_klass();
269#ifdef ASSERT
270 { ResourceMark rm;
271 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
272 assert(m->name() == m2->name() && m->signature() == m2->signature(),
273 "at %d, %s != %s", vmindex,
274 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
275 }
276#endif //ASSERT
277 }
278 if (!m->is_public()) {
279 assert(m->is_public(), "virtual call must be to public interface method");
280 return NULL; // elicit an error later in product build
281 }
282 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
283 m_klass = m_klass_non_interface;
284 }
285 if (TraceInvokeDynamic) {
286 ttyLocker ttyl;
287 ResourceMark rm;
288 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
289 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
290 m_klass->internal_name(), vmindex);
291 m->access_flags().print_on(tty);
292 if (m->is_default_method()) {
293 tty->print("default");
294 }
295 tty->cr();
296 }
297 break;
298
299 case CallInfo::direct_call:
300 vmindex = Method::nonvirtual_vtable_index;
301 if (m->is_static()) {
302 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
303 } else if (m->is_initializer()) {
304 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
305 } else {
306 // "special" reflects that this is a direct call, not that it
307 // necessarily originates from an invokespecial. We can also do
308 // direct calls for private and/or final non-static methods.
309 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
310 }
311 break;
312
313 default: assert(false, "bad CallInfo"); return NULL;
314 }
315
316 // @CallerSensitive annotation detected
317 if (m->caller_sensitive()) {
318 flags |= CALLER_SENSITIVE;
319 }
320
321 Handle resolved_method = info.resolved_method_name();
322 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(),
323 "Should not change after link resolution");
324
325 oop mname_oop = mname();
326 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
327 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
328 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
329 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
330 // Note: name and type can be lazily computed by resolve_MemberName,
331 // if Java code needs them as resolved String and MethodType objects.
332 // If relevant, the vtable or itable value is stored as vmindex.
333 // This is done eagerly, since it is readily available without
334 // constructing any new objects.
335 return mname();
336}
337
338oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
339 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
340 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
341 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
342 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
343
344 oop mname_oop = mname();
345 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
346 java_lang_invoke_MemberName::set_method (mname_oop, NULL);
347 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
348 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror());
349
350 oop type = field_signature_type_or_null(fd.signature());
351 oop name = field_name_or_null(fd.name());
352 if (name != NULL)
353 java_lang_invoke_MemberName::set_name(mname_oop, name);
354 if (type != NULL)
355 java_lang_invoke_MemberName::set_type(mname_oop, type);
356 // Note: name and type can be lazily computed by resolve_MemberName,
357 // if Java code needs them as resolved String and Class objects.
358 // Note that the incoming type oop might be pre-resolved (non-null).
359 // The base clazz and field offset (vmindex) must be eagerly stored,
360 // because they unambiguously identify the field.
361 // Although the fieldDescriptor::_index would also identify the field,
362 // we do not use it, because it is harder to decode.
363 // TO DO: maybe intern mname_oop
364 return mname();
365}
366
367// JVM 2.9 Special Methods:
368// A method is signature polymorphic if and only if all of the following conditions hold :
369// * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
370// * It has a single formal parameter of type Object[].
371// * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
372// * It has the ACC_VARARGS and ACC_NATIVE flags set.
373bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
374 if (klass == NULL)
375 return false;
376 // The following test will fail spuriously during bootstrap of MethodHandle itself:
377 // if (klass != SystemDictionary::MethodHandle_klass())
378 // Test the name instead:
379 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
380 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
381 return false;
382 }
383
384 // Look up signature polymorphic method with polymorphic return type
385 Symbol* poly_sig = vmSymbols::object_array_object_signature();
386 InstanceKlass* iklass = InstanceKlass::cast(klass);
387 Method* m = iklass->find_method(name, poly_sig);
388 if (m != NULL) {
389 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
390 int flags = m->access_flags().as_int();
391 if ((flags & required) == required) {
392 return true;
393 }
394 }
395
396 // Look up signature polymorphic method with non-polymorphic (non Object) return type
397 int me;
398 int ms = iklass->find_method_by_name(name, &me);
399 if (ms == -1) return false;
400 for (; ms < me; ms++) {
401 Method* m = iklass->methods()->at(ms);
402 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
403 int flags = m->access_flags().as_int();
404 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
405 return true;
406 }
407 }
408 return false;
409}
410
411
412Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
413 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
414 switch (iid) {
415 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
416 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
417 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
418 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
419 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
420 default:
421 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
422 return 0;
423 }
424}
425
426Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
427 switch(id) {
428 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
429 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
430 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
431 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
432 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
433 default:
434 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
435 return Bytecodes::_illegal;
436 }
437}
438
439int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
440 switch (iid) {
441 case vmIntrinsics::_invokeBasic: return 0;
442 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
443 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
444 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
445 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
446 default:
447 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
448 return 0;
449 }
450}
451
452vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
453 vmSymbols::SID name_id = vmSymbols::find_sid(name);
454 switch (name_id) {
455 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
456 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
457 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
458 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
459
460 // There is one static signature-polymorphic method for each JVM invocation mode.
461 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
462 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
463 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
464 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
465 default: break;
466 }
467
468 // Cover the case of invokeExact and any future variants of invokeFoo.
469 Klass* mh_klass = SystemDictionary::well_known_klass(
470 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
471 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
472 return vmIntrinsics::_invokeGeneric;
473 }
474
475 // Cover the case of methods on VarHandle.
476 Klass* vh_klass = SystemDictionary::well_known_klass(
477 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) );
478 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
479 return vmIntrinsics::_invokeGeneric;
480 }
481
482 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
483 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
484 return vmIntrinsics::_none;
485}
486
487vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
488 if (klass != NULL &&
489 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
490 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
491 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
492 if (iid != vmIntrinsics::_none)
493 return iid;
494 if (is_method_handle_invoke_name(klass, name))
495 return vmIntrinsics::_invokeGeneric;
496 }
497 return vmIntrinsics::_none;
498}
499
500// Returns true if method is signature polymorphic and public
501bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
502 if (is_signature_polymorphic_name(klass, name)) {
503 InstanceKlass* iklass = InstanceKlass::cast(klass);
504 int me;
505 int ms = iklass->find_method_by_name(name, &me);
506 assert(ms != -1, "");
507 for (; ms < me; ms++) {
508 Method* m = iklass->methods()->at(ms);
509 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
510 int flags = m->access_flags().as_int();
511 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
512 return true;
513 }
514 }
515 }
516 return false;
517}
518
519// convert the external string or reflective type to an internal signature
520Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
521 if (java_lang_invoke_MethodType::is_instance(type_str)) {
522 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
523 } else if (java_lang_Class::is_instance(type_str)) {
524 return java_lang_Class::as_signature(type_str, false);
525 } else if (java_lang_String::is_instance_inlined(type_str)) {
526 if (intern_if_not_found) {
527 return java_lang_String::as_symbol(type_str);
528 } else {
529 return java_lang_String::as_symbol_or_null(type_str);
530 }
531 } else {
532 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
533 }
534}
535
536static const char OBJ_SIG[] = "Ljava/lang/Object;";
537enum { OBJ_SIG_LEN = 18 };
538
539bool MethodHandles::is_basic_type_signature(Symbol* sig) {
540 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
541 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
542 const int len = sig->utf8_length();
543 for (int i = 0; i < len; i++) {
544 switch (sig->char_at(i)) {
545 case 'L':
546 // only java/lang/Object is valid here
547 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
548 return false;
549 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
550 continue;
551 case '(': case ')': case 'V':
552 case 'I': case 'J': case 'F': case 'D':
553 continue;
554 //case '[':
555 //case 'Z': case 'B': case 'C': case 'S':
556 default:
557 return false;
558 }
559 }
560 return true;
561}
562
563Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
564 Symbol* bsig = NULL;
565 if (sig == NULL) {
566 return sig;
567 } else if (is_basic_type_signature(sig)) {
568 sig->increment_refcount();
569 return sig; // that was easy
570 } else if (sig->char_at(0) != '(') {
571 BasicType bt = char2type(sig->char_at(0));
572 if (is_subword_type(bt)) {
573 bsig = vmSymbols::int_signature();
574 } else {
575 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
576 bsig = vmSymbols::object_signature();
577 }
578 } else {
579 ResourceMark rm;
580 stringStream buffer(128);
581 buffer.put('(');
582 int arg_pos = 0, keep_arg_pos = -1;
583 if (keep_last_arg)
584 keep_arg_pos = ArgumentCount(sig).size() - 1;
585 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
586 BasicType bt = ss.type();
587 size_t this_arg_pos = buffer.size();
588 if (ss.at_return_type()) {
589 buffer.put(')');
590 }
591 if (arg_pos == keep_arg_pos) {
592 buffer.write((char*) ss.raw_bytes(),
593 (int) ss.raw_length());
594 } else if (bt == T_OBJECT || bt == T_ARRAY) {
595 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
596 } else {
597 if (is_subword_type(bt))
598 bt = T_INT;
599 buffer.put(type2char(bt));
600 }
601 arg_pos++;
602 }
603 const char* sigstr = buffer.base();
604 int siglen = (int) buffer.size();
605 bsig = SymbolTable::new_symbol(sigstr, siglen);
606 }
607 assert(is_basic_type_signature(bsig) ||
608 // detune assert in case the injected argument is not a basic type:
609 keep_last_arg, "");
610 return bsig;
611}
612
613void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
614 Symbol* sig,
615 bool keep_arrays,
616 bool keep_basic_names) {
617 st = st ? st : tty;
618 int len = sig->utf8_length();
619 int array = 0;
620 bool prev_type = false;
621 for (int i = 0; i < len; i++) {
622 char ch = sig->char_at(i);
623 switch (ch) {
624 case '(': case ')':
625 prev_type = false;
626 st->put(ch);
627 continue;
628 case '[':
629 if (!keep_basic_names && keep_arrays)
630 st->put(ch);
631 array++;
632 continue;
633 case 'L':
634 {
635 if (prev_type) st->put(',');
636 int start = i+1, slash = start;
637 while (++i < len && (ch = sig->char_at(i)) != ';') {
638 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
639 }
640 if (slash < i) start = slash;
641 if (!keep_basic_names) {
642 st->put('L');
643 } else {
644 for (int j = start; j < i; j++)
645 st->put(sig->char_at(j));
646 prev_type = true;
647 }
648 break;
649 }
650 default:
651 {
652 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
653 ch = '[';
654 array = 0;
655 }
656 if (prev_type) st->put(',');
657 const char* n = NULL;
658 if (keep_basic_names)
659 n = type2name(char2type(ch));
660 if (n == NULL) {
661 // unknown letter, or we don't want to know its name
662 st->put(ch);
663 } else {
664 st->print("%s", n);
665 prev_type = true;
666 }
667 break;
668 }
669 }
670 // Switch break goes here to take care of array suffix:
671 if (prev_type) {
672 while (array > 0) {
673 st->print("[]");
674 --array;
675 }
676 }
677 array = 0;
678 }
679}
680
681
682
683static oop object_java_mirror() {
684 return SystemDictionary::Object_klass()->java_mirror();
685}
686
687oop MethodHandles::field_name_or_null(Symbol* s) {
688 if (s == NULL) return NULL;
689 return StringTable::lookup(s);
690}
691
692oop MethodHandles::field_signature_type_or_null(Symbol* s) {
693 if (s == NULL) return NULL;
694 BasicType bt = FieldType::basic_type(s);
695 if (is_java_primitive(bt)) {
696 assert(s->utf8_length() == 1, "");
697 return java_lang_Class::primitive_mirror(bt);
698 }
699 // Here are some more short cuts for common types.
700 // They are optional, since reference types can be resolved lazily.
701 if (bt == T_OBJECT) {
702 if (s == vmSymbols::object_signature()) {
703 return object_java_mirror();
704 } else if (s == vmSymbols::class_signature()) {
705 return SystemDictionary::Class_klass()->java_mirror();
706 } else if (s == vmSymbols::string_signature()) {
707 return SystemDictionary::String_klass()->java_mirror();
708 }
709 }
710 return NULL;
711}
712
713
714// An unresolved member name is a mere symbolic reference.
715// Resolving it plants a vmtarget/vmindex in it,
716// which refers directly to JVM internals.
717Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller,
718 bool speculative_resolve, TRAPS) {
719 Handle empty;
720 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
721
722 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
723 // Already resolved.
724 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
725 assert(vmindex >= Method::nonvirtual_vtable_index, "");
726 return mname;
727 }
728
729 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
730 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
731 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
732 int flags = java_lang_invoke_MemberName::flags(mname());
733 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
734 if (!ref_kind_is_valid(ref_kind)) {
735 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
736 }
737
738 DEBUG_ONLY(int old_vmindex);
739 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
740
741 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
742 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
743 }
744
745 InstanceKlass* defc = NULL;
746 {
747 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
748 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
749 if (!defc_klass->is_instance_klass()) {
750 if (!defc_klass->is_array_klass()) return empty;
751 defc_klass = SystemDictionary::Object_klass();
752 }
753 defc = InstanceKlass::cast(defc_klass);
754 }
755 if (defc == NULL) {
756 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
757 }
758 defc->link_class(CHECK_(empty)); // possible safepoint
759
760 // convert the external string name to an internal symbol
761 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
762 if (name == NULL) return empty; // no such name
763 if (name == vmSymbols::class_initializer_name())
764 return empty; // illegal name
765
766 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
767 if ((flags & ALL_KINDS) == IS_METHOD &&
768 (defc == SystemDictionary::MethodHandle_klass() || defc == SystemDictionary::VarHandle_klass()) &&
769 (ref_kind == JVM_REF_invokeVirtual ||
770 ref_kind == JVM_REF_invokeSpecial ||
771 // static invocation mode is required for _linkToVirtual, etc.:
772 ref_kind == JVM_REF_invokeStatic)) {
773 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
774 if (iid != vmIntrinsics::_none &&
775 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
776 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
777 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
778 mh_invoke_id = iid;
779 }
780 }
781
782 // convert the external string or reflective type to an internal signature
783 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
784 if (type == NULL) return empty; // no such signature exists in the VM
785
786 LinkInfo::AccessCheck access_check = caller != NULL ?
787 LinkInfo::needs_access_check :
788 LinkInfo::skip_access_check;
789
790 // Time to do the lookup.
791 switch (flags & ALL_KINDS) {
792 case IS_METHOD:
793 {
794 CallInfo result;
795 LinkInfo link_info(defc, name, type, caller, access_check);
796 {
797 assert(!HAS_PENDING_EXCEPTION, "");
798 if (ref_kind == JVM_REF_invokeStatic) {
799 LinkResolver::resolve_static_call(result,
800 link_info, false, THREAD);
801 } else if (ref_kind == JVM_REF_invokeInterface) {
802 LinkResolver::resolve_interface_call(result, Handle(), defc,
803 link_info, false, THREAD);
804 } else if (mh_invoke_id != vmIntrinsics::_none) {
805 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
806 LinkResolver::resolve_handle_call(result, link_info, THREAD);
807 } else if (ref_kind == JVM_REF_invokeSpecial) {
808 LinkResolver::resolve_special_call(result, Handle(),
809 link_info, THREAD);
810 } else if (ref_kind == JVM_REF_invokeVirtual) {
811 LinkResolver::resolve_virtual_call(result, Handle(), defc,
812 link_info, false, THREAD);
813 } else {
814 assert(false, "ref_kind=%d", ref_kind);
815 }
816 if (HAS_PENDING_EXCEPTION) {
817 if (speculative_resolve) {
818 CLEAR_PENDING_EXCEPTION;
819 }
820 return empty;
821 }
822 }
823 if (result.resolved_appendix().not_null()) {
824 // The resolved MemberName must not be accompanied by an appendix argument,
825 // since there is no way to bind this value into the MemberName.
826 // Caller is responsible to prevent this from happening.
827 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
828 }
829 result.set_resolved_method_name(CHECK_(empty));
830 oop mname2 = init_method_MemberName(mname, result);
831 return Handle(THREAD, mname2);
832 }
833 case IS_CONSTRUCTOR:
834 {
835 CallInfo result;
836 LinkInfo link_info(defc, name, type, caller, access_check);
837 {
838 assert(!HAS_PENDING_EXCEPTION, "");
839 if (name == vmSymbols::object_initializer_name()) {
840 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
841 } else {
842 break; // will throw after end of switch
843 }
844 if (HAS_PENDING_EXCEPTION) {
845 if (speculative_resolve) {
846 CLEAR_PENDING_EXCEPTION;
847 }
848 return empty;
849 }
850 }
851 assert(result.is_statically_bound(), "");
852 result.set_resolved_method_name(CHECK_(empty));
853 oop mname2 = init_method_MemberName(mname, result);
854 return Handle(THREAD, mname2);
855 }
856 case IS_FIELD:
857 {
858 fieldDescriptor result; // find_field initializes fd if found
859 {
860 assert(!HAS_PENDING_EXCEPTION, "");
861 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
862 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
863 if (HAS_PENDING_EXCEPTION) {
864 if (speculative_resolve) {
865 CLEAR_PENDING_EXCEPTION;
866 }
867 return empty;
868 }
869 }
870 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
871 return Handle(THREAD, mname2);
872 }
873 default:
874 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
875 }
876
877 return empty;
878}
879
880// Conversely, a member name which is only initialized from JVM internals
881// may have null defc, name, and type fields.
882// Resolving it plants a vmtarget/vmindex in it,
883// which refers directly to JVM internals.
884void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
885 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
886
887 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
888 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
889 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
890 int flags = java_lang_invoke_MemberName::flags(mname());
891
892 if (suppress != 0) {
893 if (suppress & _suppress_defc) have_defc = true;
894 if (suppress & _suppress_name) have_name = true;
895 if (suppress & _suppress_type) have_type = true;
896 }
897
898 if (have_defc && have_name && have_type) return; // nothing needed
899
900 switch (flags & ALL_KINDS) {
901 case IS_METHOD:
902 case IS_CONSTRUCTOR:
903 {
904 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
905 if (vmtarget == NULL) {
906 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
907 }
908 methodHandle m(THREAD, vmtarget);
909 DEBUG_ONLY(vmtarget = NULL); // safety
910 if (!have_defc) {
911 InstanceKlass* defc = m->method_holder();
912 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
913 }
914 if (!have_name) {
915 //not java_lang_String::create_from_symbol; let's intern member names
916 oop name = StringTable::intern(m->name(), CHECK);
917 java_lang_invoke_MemberName::set_name(mname(), name);
918 }
919 if (!have_type) {
920 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
921 java_lang_invoke_MemberName::set_type(mname(), type());
922 }
923 return;
924 }
925 case IS_FIELD:
926 {
927 oop clazz = java_lang_invoke_MemberName::clazz(mname());
928 if (clazz == NULL) {
929 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
930 }
931 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
932 DEBUG_ONLY(clazz = NULL); // safety
933 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
934 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
935 fieldDescriptor fd; // find_field initializes fd if found
936 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
937 break; // cannot expand
938 if (!have_name) {
939 //not java_lang_String::create_from_symbol; let's intern member names
940 oop name = StringTable::intern(fd.name(), CHECK);
941 java_lang_invoke_MemberName::set_name(mname(), name);
942 }
943 if (!have_type) {
944 // If it is a primitive field type, don't mess with short strings like "I".
945 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
946 if (type.is_null()) {
947 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
948 }
949 java_lang_invoke_MemberName::set_type(mname(), type());
950 }
951 return;
952 }
953 }
954 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
955}
956
957int MethodHandles::find_MemberNames(Klass* k,
958 Symbol* name, Symbol* sig,
959 int mflags, Klass* caller,
960 int skip, objArrayHandle results, TRAPS) {
961 // %%% take caller into account!
962
963 Thread* thread = Thread::current();
964
965 if (k == NULL || !k->is_instance_klass()) return -1;
966
967 int rfill = 0, rlimit = results->length(), rskip = skip;
968 // overflow measurement:
969 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
970
971 int match_flags = mflags;
972 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
973 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
974 bool local_only = !(search_superc | search_intfc);
975
976 if (name != NULL) {
977 if (name->utf8_length() == 0) return 0; // a match is not possible
978 }
979 if (sig != NULL) {
980 if (sig->utf8_length() == 0) return 0; // a match is not possible
981 if (sig->char_at(0) == '(')
982 match_flags &= ~(IS_FIELD | IS_TYPE);
983 else
984 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
985 }
986
987 if ((match_flags & IS_TYPE) != 0) {
988 // NYI, and Core Reflection works quite well for this query
989 }
990
991 if ((match_flags & IS_FIELD) != 0) {
992 InstanceKlass* ik = InstanceKlass::cast(k);
993 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
994 if (name != NULL && st.name() != name)
995 continue;
996 if (sig != NULL && st.signature() != sig)
997 continue;
998 // passed the filters
999 if (rskip > 0) {
1000 --rskip;
1001 } else if (rfill < rlimit) {
1002 Handle result(thread, results->obj_at(rfill++));
1003 if (!java_lang_invoke_MemberName::is_instance(result()))
1004 return -99; // caller bug!
1005 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
1006 if (!oopDesc::equals(saved, result()))
1007 results->obj_at_put(rfill-1, saved); // show saved instance to user
1008 } else if (++overflow >= overflow_limit) {
1009 match_flags = 0; break; // got tired of looking at overflow
1010 }
1011 }
1012 }
1013
1014 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
1015 // watch out for these guys:
1016 Symbol* init_name = vmSymbols::object_initializer_name();
1017 Symbol* clinit_name = vmSymbols::class_initializer_name();
1018 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
1019 bool negate_name_test = false;
1020 // fix name so that it captures the intention of IS_CONSTRUCTOR
1021 if (!(match_flags & IS_METHOD)) {
1022 // constructors only
1023 if (name == NULL) {
1024 name = init_name;
1025 } else if (name != init_name) {
1026 return 0; // no constructors of this method name
1027 }
1028 } else if (!(match_flags & IS_CONSTRUCTOR)) {
1029 // methods only
1030 if (name == NULL) {
1031 name = init_name;
1032 negate_name_test = true; // if we see the name, we *omit* the entry
1033 } else if (name == init_name) {
1034 return 0; // no methods of this constructor name
1035 }
1036 } else {
1037 // caller will accept either sort; no need to adjust name
1038 }
1039 InstanceKlass* ik = InstanceKlass::cast(k);
1040 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
1041 Method* m = st.method();
1042 Symbol* m_name = m->name();
1043 if (m_name == clinit_name)
1044 continue;
1045 if (name != NULL && ((m_name != name) ^ negate_name_test))
1046 continue;
1047 if (sig != NULL && m->signature() != sig)
1048 continue;
1049 // passed the filters
1050 if (rskip > 0) {
1051 --rskip;
1052 } else if (rfill < rlimit) {
1053 Handle result(thread, results->obj_at(rfill++));
1054 if (!java_lang_invoke_MemberName::is_instance(result()))
1055 return -99; // caller bug!
1056 CallInfo info(m, NULL, CHECK_0);
1057 oop saved = MethodHandles::init_method_MemberName(result, info);
1058 if (!oopDesc::equals(saved, result()))
1059 results->obj_at_put(rfill-1, saved); // show saved instance to user
1060 } else if (++overflow >= overflow_limit) {
1061 match_flags = 0; break; // got tired of looking at overflow
1062 }
1063 }
1064 }
1065
1066 // return number of elements we at leasted wanted to initialize
1067 return rfill + overflow;
1068}
1069
1070void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
1071 assert_locked_or_safepoint(CodeCache_lock);
1072
1073 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1074 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1075 // Try to purge stale entries on updates.
1076 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
1077 // in order to avoid memory leak, stale entries are purged whenever a dependency list
1078 // is changed (both on addition and removal). Though memory reclamation is delayed,
1079 // it avoids indefinite memory usage growth.
1080 deps.add_dependent_nmethod(nm);
1081}
1082
1083void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
1084 assert_locked_or_safepoint(CodeCache_lock);
1085
1086 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1087 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1088 deps.remove_dependent_nmethod(nm);
1089}
1090
1091void MethodHandles::clean_dependency_context(oop call_site) {
1092 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1093 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1094 deps.clean_unloading_dependents();
1095}
1096
1097void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
1098 assert_lock_strong(Compile_lock);
1099
1100 int marked = 0;
1101 CallSiteDepChange changes(call_site, target);
1102 {
1103 NoSafepointVerifier nsv;
1104 MutexLocker mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1105
1106 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site());
1107 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1108 marked = deps.mark_dependent_nmethods(changes);
1109 }
1110 if (marked > 0) {
1111 // At least one nmethod has been marked for deoptimization.
1112 VM_Deoptimize op;
1113 VMThread::execute(&op);
1114 }
1115}
1116
1117void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
1118 if (TraceMethodHandles) {
1119 const char* name = vmIntrinsics::name_at(iid);
1120 if (*name == '_') name += 1;
1121 const size_t len = strlen(name) + 50;
1122 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
1123 const char* suffix = "";
1124 if (is_signature_polymorphic(iid)) {
1125 if (is_signature_polymorphic_static(iid))
1126 suffix = "/static";
1127 else
1128 suffix = "/private";
1129 }
1130 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
1131 trace_method_handle(_masm, qname);
1132 // Note: Don't free the allocated char array because it's used
1133 // during runtime.
1134 }
1135}
1136
1137//
1138// Here are the native methods in java.lang.invoke.MethodHandleNatives
1139// They are the private interface between this JVM and the HotSpot-specific
1140// Java code that implements JSR 292 method handles.
1141//
1142// Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1143// that intrinsic (non-JNI) native methods are defined in HotSpot.
1144//
1145
1146#ifndef PRODUCT
1147#define EACH_NAMED_CON(template, requirement) \
1148 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1149 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1150 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1151 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1152 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1153 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1154 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1155 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1156 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1157 /*end*/
1158
1159#define IGNORE_REQ(req_expr) /* req_expr */
1160#define ONE_PLUS(scope,value) 1+
1161static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1162#define VALUE_COMMA(scope,value) scope::value,
1163static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1164#define STRING_NULL(scope,value) #value "\0"
1165static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1166
1167static bool advertise_con_value(int which) {
1168 if (which < 0) return false;
1169 bool ok = true;
1170 int count = 0;
1171#define INC_COUNT(scope,value) \
1172 ++count;
1173#define CHECK_REQ(req_expr) \
1174 if (which < count) return ok; \
1175 ok = (req_expr);
1176 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1177#undef INC_COUNT
1178#undef CHECK_REQ
1179 assert(count == con_value_count, "");
1180 if (which < count) return ok;
1181 return false;
1182}
1183
1184#undef ONE_PLUS
1185#undef VALUE_COMMA
1186#undef STRING_NULL
1187#undef EACH_NAMED_CON
1188#endif // PRODUCT
1189
1190JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1191#ifndef PRODUCT
1192 if (advertise_con_value(which)) {
1193 assert(which >= 0 && which < con_value_count, "");
1194 int con = con_values[which];
1195 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1196 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1197 const char* str = &con_names[0];
1198 for (int i = 0; i < which; i++)
1199 str += strlen(str) + 1; // skip name and null
1200 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1201 box->obj_at_put(0, name);
1202 }
1203 return con;
1204 }
1205#endif
1206 return 0;
1207}
1208JVM_END
1209
1210// void init(MemberName self, AccessibleObject ref)
1211JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1212 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1213 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1214 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1215 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1216 MethodHandles::init_MemberName(mname, target, CHECK);
1217}
1218JVM_END
1219
1220// void expand(MemberName self)
1221JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1222 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1223 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1224 MethodHandles::expand_MemberName(mname, 0, CHECK);
1225}
1226JVM_END
1227
1228// void resolve(MemberName self, Class<?> caller)
1229JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1230 jboolean speculative_resolve)) {
1231 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1232 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1233
1234 // The trusted Java code that calls this method should already have performed
1235 // access checks on behalf of the given caller. But, we can verify this.
1236 if (VerifyMethodHandles && caller_jh != NULL &&
1237 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1238 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1239 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1240 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1241 }
1242
1243 // Reflection::verify_class_access can only handle instance classes.
1244 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1245 // Emulate LinkResolver::check_klass_accessability.
1246 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1247 if (caller != SystemDictionary::Object_klass()
1248 && Reflection::verify_class_access(caller,
1249 InstanceKlass::cast(reference_klass),
1250 true) != Reflection::ACCESS_OK) {
1251 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1252 }
1253 }
1254 }
1255
1256 Klass* caller = caller_jh == NULL ? NULL :
1257 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1258 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, speculative_resolve == JNI_TRUE,
1259 CHECK_NULL);
1260
1261 if (resolved.is_null()) {
1262 int flags = java_lang_invoke_MemberName::flags(mname());
1263 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1264 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1265 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1266 }
1267 if (speculative_resolve) {
1268 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1269 return NULL;
1270 }
1271 if ((flags & ALL_KINDS) == IS_FIELD) {
1272 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1273 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1274 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1275 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1276 } else {
1277 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1278 }
1279 }
1280
1281 return JNIHandles::make_local(THREAD, resolved());
1282}
1283JVM_END
1284
1285static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1286 if (mname == NULL ||
1287 java_lang_invoke_MemberName::clazz(mname) == NULL) {
1288 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1289 } else {
1290 int flags = java_lang_invoke_MemberName::flags(mname);
1291 if ((flags & IS_FIELD) != 0 &&
1292 (must_be_static
1293 ? (flags & JVM_ACC_STATIC) != 0
1294 : (flags & JVM_ACC_STATIC) == 0)) {
1295 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1296 return (jlong) vmindex;
1297 }
1298 }
1299 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1300 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1301 return 0;
1302}
1303
1304JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1305 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1306}
1307JVM_END
1308
1309JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1310 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1311}
1312JVM_END
1313
1314JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1315 // use the other function to perform sanity checks:
1316 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1317 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1318 return JNIHandles::make_local(THREAD, clazz);
1319}
1320JVM_END
1321
1322JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1323 if (mname_jh == NULL) return NULL;
1324 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1325 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1326 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1327 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1328 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1329 result->obj_at_put(0, x);
1330
1331 int flags = java_lang_invoke_MemberName::flags(mname());
1332 if ((flags & IS_FIELD) != 0) {
1333 x = java_lang_invoke_MemberName::clazz(mname());
1334 } else {
1335 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1336 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1337 x = mname();
1338 }
1339 result->obj_at_put(1, x);
1340 return JNIHandles::make_local(env, result());
1341}
1342JVM_END
1343
1344
1345
1346// static native int getMembers(Class<?> defc, String matchName, String matchSig,
1347// int matchFlags, Class<?> caller, int skip, MemberName[] results);
1348JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1349 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1350 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1351 if (clazz_jh == NULL || results_jh == NULL) return -1;
1352 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1353
1354 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1355 if (results.is_null() || !results->is_objArray()) return -1;
1356
1357 TempNewSymbol name = NULL;
1358 TempNewSymbol sig = NULL;
1359 if (name_jh != NULL) {
1360 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1361 if (name == NULL) return 0; // a match is not possible
1362 }
1363 if (sig_jh != NULL) {
1364 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1365 if (sig == NULL) return 0; // a match is not possible
1366 }
1367
1368 Klass* caller = NULL;
1369 if (caller_jh != NULL) {
1370 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1371 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1372 caller = java_lang_Class::as_Klass(caller_oop);
1373 }
1374
1375 if (name != NULL && sig != NULL && results.not_null()) {
1376 // try a direct resolve
1377 // %%% TO DO
1378 }
1379
1380 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1381 caller, skip, results, CHECK_0);
1382 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1383 return res;
1384}
1385JVM_END
1386
1387JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1388 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1389 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1390 {
1391 // Walk all nmethods depending on this call site.
1392 MutexLocker mu(Compile_lock, thread);
1393 MethodHandles::flush_dependent_nmethods(call_site, target);
1394 java_lang_invoke_CallSite::set_target(call_site(), target());
1395 }
1396}
1397JVM_END
1398
1399JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1400 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1401 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1402 {
1403 // Walk all nmethods depending on this call site.
1404 MutexLocker mu(Compile_lock, thread);
1405 MethodHandles::flush_dependent_nmethods(call_site, target);
1406 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1407 }
1408}
1409JVM_END
1410
1411JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1412 jobject caller_jh, jintArray index_info_jh,
1413 jint start, jint end,
1414 jobjectArray buf_jh, jint pos,
1415 jboolean resolve, jobject ifna_jh)) {
1416 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1417 if (caller_k == NULL || !caller_k->is_instance_klass()) {
1418 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1419 }
1420 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1421 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1422 if (index_info_oop == NULL ||
1423 index_info_oop->klass() != Universe::intArrayKlassObj() ||
1424 typeArrayOop(index_info_oop)->length() < 2) {
1425 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1426 }
1427 typeArrayHandle index_info(THREAD, index_info_oop);
1428 int bss_index_in_pool = index_info->int_at(1);
1429 // While we are here, take a quick look at the index info:
1430 if (bss_index_in_pool <= 0 ||
1431 bss_index_in_pool >= caller->constants()->length() ||
1432 index_info->int_at(0)
1433 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1434 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1435 }
1436 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1437 if (start < 0) {
1438 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1439 if (start == pseudo_index) {
1440 if (start >= end || 0 > pos || pos >= buf->length()) break;
1441 oop pseudo_arg = NULL;
1442 switch (pseudo_index) {
1443 case -4: // bootstrap method
1444 {
1445 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool);
1446 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1447 break;
1448 }
1449 case -3: // name
1450 {
1451 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool);
1452 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1453 pseudo_arg = str();
1454 break;
1455 }
1456 case -2: // type
1457 {
1458 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool);
1459 Handle th;
1460 if (type->char_at(0) == '(') {
1461 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1462 } else {
1463 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1464 }
1465 pseudo_arg = th();
1466 break;
1467 }
1468 case -1: // argument count
1469 {
1470 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool);
1471 jvalue argc_value; argc_value.i = (jint)argc;
1472 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1473 break;
1474 }
1475 }
1476
1477 // Store the pseudo-argument, and advance the pointers.
1478 buf->obj_at_put(pos++, pseudo_arg);
1479 ++start;
1480 }
1481 }
1482 // When we are done with this there may be regular arguments to process too.
1483 }
1484 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1485 caller->constants()->
1486 copy_bootstrap_arguments_at(bss_index_in_pool,
1487 start, end, buf, pos,
1488 (resolve == JNI_TRUE), ifna, CHECK);
1489}
1490JVM_END
1491
1492// It is called by a Cleaner object which ensures that dropped CallSites properly
1493// deallocate their dependency information.
1494JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1495 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1496 {
1497 // Walk all nmethods depending on this call site.
1498 MutexLocker mu1(Compile_lock, thread);
1499
1500 int marked = 0;
1501 {
1502 NoSafepointVerifier nsv;
1503 MutexLocker mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1504 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1505 marked = deps.remove_all_dependents();
1506 }
1507 if (marked > 0) {
1508 // At least one nmethod has been marked for deoptimization
1509 VM_Deoptimize op;
1510 VMThread::execute(&op);
1511 }
1512 }
1513}
1514JVM_END
1515
1516/**
1517 * Throws a java/lang/UnsupportedOperationException unconditionally.
1518 * This is required by the specification of MethodHandle.invoke if
1519 * invoked directly.
1520 */
1521JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1522 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1523 return NULL;
1524}
1525JVM_END
1526
1527/**
1528 * Throws a java/lang/UnsupportedOperationException unconditionally.
1529 * This is required by the specification of MethodHandle.invokeExact if
1530 * invoked directly.
1531 */
1532JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1533 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1534 return NULL;
1535}
1536JVM_END
1537
1538/// JVM_RegisterMethodHandleMethods
1539
1540#undef CS // Solaris builds complain
1541
1542#define LANG "Ljava/lang/"
1543#define JLINV "Ljava/lang/invoke/"
1544
1545#define OBJ LANG "Object;"
1546#define CLS LANG "Class;"
1547#define STRG LANG "String;"
1548#define CS JLINV "CallSite;"
1549#define MT JLINV "MethodType;"
1550#define MH JLINV "MethodHandle;"
1551#define MEM JLINV "MemberName;"
1552#define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1553
1554#define CC (char*) /*cast a literal from (const char*)*/
1555#define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1556
1557// These are the native methods on java.lang.invoke.MethodHandleNatives.
1558static JNINativeMethod MHN_methods[] = {
1559 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1560 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1561 {CC "resolve", CC "(" MEM "" CLS "Z)" MEM, FN_PTR(MHN_resolve_Mem)},
1562 // static native int getNamedCon(int which, Object[] name)
1563 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1564 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1565 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1566 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1567 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1568 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1569 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1570 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1571 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1572 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1573 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1574 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1575};
1576
1577static JNINativeMethod MH_methods[] = {
1578 // UnsupportedOperationException throwers
1579 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1580 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1581};
1582
1583/**
1584 * This one function is exported, used by NativeLookup.
1585 */
1586JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1587 assert(!MethodHandles::enabled(), "must not be enabled");
1588 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1589
1590 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1591 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1592
1593 {
1594 ThreadToNativeFromVM ttnfv(thread);
1595
1596 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1597 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1598 "register java.lang.invoke.MethodHandleNative natives");
1599
1600 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1601 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1602 "register java.lang.invoke.MethodHandle natives");
1603 }
1604
1605 if (TraceInvokeDynamic) {
1606 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1607 }
1608
1609 MethodHandles::set_enabled(true);
1610}
1611JVM_END
1612