1 /*
2 * Copyright (c) 2008, 2020, 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 "logging/log.hpp"
36 #include "logging/logStream.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/oopFactory.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "memory/universe.hpp"
41 #include "oops/objArrayKlass.hpp"
42 #include "oops/objArrayOop.inline.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "oops/typeArrayOop.inline.hpp"
45 #include "prims/methodHandles.hpp"
46 #include "runtime/deoptimization.hpp"
47 #include "runtime/fieldDescriptor.inline.hpp"
48 #include "runtime/handles.inline.hpp"
49 #include "runtime/interfaceSupport.inline.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/jniHandles.inline.hpp"
52 #include "runtime/timerTrace.hpp"
53 #include "runtime/reflection.hpp"
54 #include "runtime/safepointVerifiers.hpp"
55 #include "runtime/signature.hpp"
56 #include "runtime/stubRoutines.hpp"
57 #include "utilities/exceptions.hpp"
58
59
60 /*
61 * JSR 292 reference implementation: method handles
62 * The JDK 7 reference implementation represented method handle
63 * combinations as chains. Each link in the chain had a "vmentry"
64 * field which pointed at a bit of assembly code which performed
65 * one transformation before dispatching to the next link in the chain.
66 *
67 * The current reference implementation pushes almost all code generation
68 * responsibility to (trusted) Java code. A method handle contains a
69 * pointer to its "LambdaForm", which embodies all details of the method
70 * handle's behavior. The LambdaForm is a normal Java object, managed
71 * by a runtime coded in Java.
72 */
73
74 bool MethodHandles::_enabled = false; // set true after successful native linkage
75 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
76
77 /**
78 * Generates method handle adapters. Returns 'false' if memory allocation
79 * failed and true otherwise.
80 */
generate_adapters()81 void MethodHandles::generate_adapters() {
82 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
83 assert(_adapter_code == NULL, "generate only once");
84
85 ResourceMark rm;
86 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
87 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
88 CodeBuffer code(_adapter_code);
89 MethodHandlesAdapterGenerator g(&code);
90 g.generate();
91 code.log_section_sizes("MethodHandlesAdapterBlob");
92 }
93
94 //------------------------------------------------------------------------------
95 // MethodHandlesAdapterGenerator::generate
96 //
generate()97 void MethodHandlesAdapterGenerator::generate() {
98 // Generate generic method handle adapters.
99 // Generate interpreter entries
100 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
101 mk <= Interpreter::method_handle_invoke_LAST;
102 mk = Interpreter::MethodKind(1 + (int)mk)) {
103 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
104 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
105 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
106 if (entry != NULL) {
107 Interpreter::set_entry_for_kind(mk, entry);
108 }
109 // If the entry is not set, it will throw AbstractMethodError.
110 }
111 }
112
set_enabled(bool z)113 void MethodHandles::set_enabled(bool z) {
114 if (_enabled != z) {
115 guarantee(z, "can only enable once");
116 _enabled = z;
117 }
118 }
119
120 // MemberName support
121
122 // import java_lang_invoke_MemberName.*
123 enum {
124 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
125 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
126 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
127 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
128 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
129 TRUSTED_FINAL = java_lang_invoke_MemberName::MN_TRUSTED_FINAL,
130 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
131 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
132 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
133 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
134 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
135 };
136
ref_kind_to_flags(int ref_kind)137 int MethodHandles::ref_kind_to_flags(int ref_kind) {
138 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
139 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
140 if (ref_kind_is_field(ref_kind)) {
141 flags |= IS_FIELD;
142 } else if (ref_kind_is_method(ref_kind)) {
143 flags |= IS_METHOD;
144 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
145 flags |= IS_CONSTRUCTOR;
146 }
147 return flags;
148 }
149
resolve_MemberName_type(Handle mname,Klass * caller,TRAPS)150 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
151 Handle empty;
152 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
153 if (!java_lang_String::is_instance_inlined(type())) {
154 return type; // already resolved
155 }
156 Symbol* signature = java_lang_String::as_symbol_or_null(type());
157 if (signature == NULL) {
158 return empty; // no such signature exists in the VM
159 }
160 Handle resolved;
161 int flags = java_lang_invoke_MemberName::flags(mname());
162 switch (flags & ALL_KINDS) {
163 case IS_METHOD:
164 case IS_CONSTRUCTOR:
165 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
166 break;
167 case IS_FIELD:
168 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
169 break;
170 default:
171 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
172 }
173 if (resolved.is_null()) {
174 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
175 }
176 return resolved;
177 }
178
init_MemberName(Handle mname,Handle target,TRAPS)179 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
180 // This method is used from java.lang.invoke.MemberName constructors.
181 // It fills in the new MemberName from a java.lang.reflect.Member.
182 Thread* thread = Thread::current();
183 oop target_oop = target();
184 Klass* target_klass = target_oop->klass();
185 if (target_klass == SystemDictionary::reflect_Field_klass()) {
186 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
187 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
188 Klass* k = java_lang_Class::as_Klass(clazz);
189 if (k != NULL && k->is_instance_klass()) {
190 fieldDescriptor fd(InstanceKlass::cast(k), slot);
191 oop mname2 = init_field_MemberName(mname, fd);
192 if (mname2 != NULL) {
193 // Since we have the reified name and type handy, add them to the result.
194 if (java_lang_invoke_MemberName::name(mname2) == NULL)
195 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
196 if (java_lang_invoke_MemberName::type(mname2) == NULL)
197 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
198 }
199 return mname2;
200 }
201 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
202 oop clazz = java_lang_reflect_Method::clazz(target_oop);
203 int slot = java_lang_reflect_Method::slot(target_oop);
204 Klass* k = java_lang_Class::as_Klass(clazz);
205 if (k != NULL && k->is_instance_klass()) {
206 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
207 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
208 return NULL; // do not resolve unless there is a concrete signature
209 CallInfo info(m, k, CHECK_NULL);
210 return init_method_MemberName(mname, info);
211 }
212 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
213 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
214 int slot = java_lang_reflect_Constructor::slot(target_oop);
215 Klass* k = java_lang_Class::as_Klass(clazz);
216 if (k != NULL && k->is_instance_klass()) {
217 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
218 if (m == NULL) return NULL;
219 CallInfo info(m, k, CHECK_NULL);
220 return init_method_MemberName(mname, info);
221 }
222 }
223 return NULL;
224 }
225
init_method_MemberName(Handle mname,CallInfo & info)226 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
227 assert(info.resolved_appendix().is_null(), "only normal methods here");
228 methodHandle m(Thread::current(), info.resolved_method());
229 assert(m.not_null(), "null method handle");
230 InstanceKlass* m_klass = m->method_holder();
231 assert(m_klass != NULL, "null holder for method handle");
232 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
233 int vmindex = Method::invalid_vtable_index;
234 LogTarget(Debug, methodhandles, indy) lt_indy;
235
236 switch (info.call_kind()) {
237 case CallInfo::itable_call:
238 vmindex = info.itable_index();
239 // More importantly, the itable index only works with the method holder.
240 assert(m_klass->verify_itable_index(vmindex), "");
241 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
242 if (lt_indy.is_enabled()) {
243 ResourceMark rm;
244 LogStream ls(lt_indy);
245 ls.print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
246 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
247 vmindex);
248 m->access_flags().print_on(&ls);
249 if (!m->is_abstract()) {
250 if (!m->is_private()) {
251 ls.print("default");
252 }
253 else {
254 ls.print("private-intf");
255 }
256 }
257 ls.cr();
258 }
259 break;
260
261 case CallInfo::vtable_call:
262 vmindex = info.vtable_index();
263 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
264 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
265 if (m_klass->is_interface()) {
266 // This is a vtable call to an interface method (abstract "miranda method" or default method).
267 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
268 // (LinkResolver should help us figure this out.)
269 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass");
270 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass());
271 if (m_klass_non_interface->is_interface()) {
272 m_klass_non_interface = SystemDictionary::Object_klass();
273 #ifdef ASSERT
274 { ResourceMark rm;
275 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
276 assert(m->name() == m2->name() && m->signature() == m2->signature(),
277 "at %d, %s != %s", vmindex,
278 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
279 }
280 #endif //ASSERT
281 }
282 if (!m->is_public()) {
283 assert(m->is_public(), "virtual call must be to public interface method");
284 return NULL; // elicit an error later in product build
285 }
286 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
287 m_klass = m_klass_non_interface;
288 }
289 if (lt_indy.is_enabled()) {
290 ResourceMark rm;
291 LogStream ls(lt_indy);
292 ls.print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
293 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
294 m_klass->internal_name(), vmindex);
295 m->access_flags().print_on(&ls);
296 if (m->is_default_method()) {
297 ls.print("default");
298 }
299 ls.cr();
300 }
301 break;
302
303 case CallInfo::direct_call:
304 vmindex = Method::nonvirtual_vtable_index;
305 if (m->is_static()) {
306 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
307 } else if (m->is_initializer()) {
308 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
309 } else {
310 // "special" reflects that this is a direct call, not that it
311 // necessarily originates from an invokespecial. We can also do
312 // direct calls for private and/or final non-static methods.
313 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
314 }
315 break;
316
317 default: assert(false, "bad CallInfo"); return NULL;
318 }
319
320 // @CallerSensitive annotation detected
321 if (m->caller_sensitive()) {
322 flags |= CALLER_SENSITIVE;
323 }
324
325 Handle resolved_method = info.resolved_method_name();
326 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(),
327 "Should not change after link resolution");
328
329 oop mname_oop = mname();
330 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
331 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
332 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
333 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
334 // Note: name and type can be lazily computed by resolve_MemberName,
335 // if Java code needs them as resolved String and MethodType objects.
336 // If relevant, the vtable or itable value is stored as vmindex.
337 // This is done eagerly, since it is readily available without
338 // constructing any new objects.
339 return mname();
340 }
341
init_field_MemberName(Handle mname,fieldDescriptor & fd,bool is_setter)342 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
343 InstanceKlass* ik = fd.field_holder();
344 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
345 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
346 if (fd.is_trusted_final()) flags |= TRUSTED_FINAL;
347 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
348 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
349
350 oop mname_oop = mname();
351 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
352 java_lang_invoke_MemberName::set_method (mname_oop, NULL);
353 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
354 java_lang_invoke_MemberName::set_clazz (mname_oop, ik->java_mirror());
355
356 oop type = field_signature_type_or_null(fd.signature());
357 oop name = field_name_or_null(fd.name());
358 if (name != NULL)
359 java_lang_invoke_MemberName::set_name(mname_oop, name);
360 if (type != NULL)
361 java_lang_invoke_MemberName::set_type(mname_oop, type);
362 // Note: name and type can be lazily computed by resolve_MemberName,
363 // if Java code needs them as resolved String and Class objects.
364 // Note that the incoming type oop might be pre-resolved (non-null).
365 // The base clazz and field offset (vmindex) must be eagerly stored,
366 // because they unambiguously identify the field.
367 // Although the fieldDescriptor::_index would also identify the field,
368 // we do not use it, because it is harder to decode.
369 // TO DO: maybe intern mname_oop
370 return mname();
371 }
372
373 // JVM 2.9 Special Methods:
374 // A method is signature polymorphic if and only if all of the following conditions hold :
375 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
376 // * It has a single formal parameter of type Object[].
377 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
378 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
is_method_handle_invoke_name(Klass * klass,Symbol * name)379 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
380 if (klass == NULL)
381 return false;
382 // The following test will fail spuriously during bootstrap of MethodHandle itself:
383 // if (klass != SystemDictionary::MethodHandle_klass())
384 // Test the name instead:
385 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
386 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
387 return false;
388 }
389
390 // Look up signature polymorphic method with polymorphic return type
391 Symbol* poly_sig = vmSymbols::object_array_object_signature();
392 InstanceKlass* iklass = InstanceKlass::cast(klass);
393 Method* m = iklass->find_method(name, poly_sig);
394 if (m != NULL) {
395 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
396 int flags = m->access_flags().as_int();
397 if ((flags & required) == required) {
398 return true;
399 }
400 }
401
402 // Look up signature polymorphic method with non-polymorphic (non Object) return type
403 int me;
404 int ms = iklass->find_method_by_name(name, &me);
405 if (ms == -1) return false;
406 for (; ms < me; ms++) {
407 Method* m = iklass->methods()->at(ms);
408 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
409 int flags = m->access_flags().as_int();
410 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
411 return true;
412 }
413 }
414 return false;
415 }
416
417
signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid)418 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
419 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
420 switch (iid) {
421 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
422 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
423 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
424 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
425 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
426 default:
427 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
428 return 0;
429 }
430 }
431
signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id)432 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
433 switch(id) {
434 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
435 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
436 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
437 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
438 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
439 default:
440 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
441 return Bytecodes::_illegal;
442 }
443 }
444
signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid)445 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
446 switch (iid) {
447 case vmIntrinsics::_invokeBasic: return 0;
448 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
449 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
450 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
451 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
452 default:
453 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
454 return 0;
455 }
456 }
457
signature_polymorphic_name_id(Symbol * name)458 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
459 vmSymbols::SID name_id = vmSymbols::find_sid(name);
460 switch (name_id) {
461 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
462 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
463 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
464 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
465
466 // There is one static signature-polymorphic method for each JVM invocation mode.
467 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
468 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
469 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
470 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
471 default: break;
472 }
473
474 // Cover the case of invokeExact and any future variants of invokeFoo.
475 Klass* mh_klass = SystemDictionary::well_known_klass(
476 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
477 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
478 return vmIntrinsics::_invokeGeneric;
479 }
480
481 // Cover the case of methods on VarHandle.
482 Klass* vh_klass = SystemDictionary::well_known_klass(
483 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) );
484 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
485 return vmIntrinsics::_invokeGeneric;
486 }
487
488 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
489 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
490 return vmIntrinsics::_none;
491 }
492
signature_polymorphic_name_id(Klass * klass,Symbol * name)493 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
494 if (klass != NULL &&
495 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
496 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
497 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
498 if (iid != vmIntrinsics::_none)
499 return iid;
500 if (is_method_handle_invoke_name(klass, name))
501 return vmIntrinsics::_invokeGeneric;
502 }
503 return vmIntrinsics::_none;
504 }
505
506 // Returns true if method is signature polymorphic and public
is_signature_polymorphic_public_name(Klass * klass,Symbol * name)507 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
508 if (is_signature_polymorphic_name(klass, name)) {
509 InstanceKlass* iklass = InstanceKlass::cast(klass);
510 int me;
511 int ms = iklass->find_method_by_name(name, &me);
512 assert(ms != -1, "");
513 for (; ms < me; ms++) {
514 Method* m = iklass->methods()->at(ms);
515 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
516 int flags = m->access_flags().as_int();
517 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
518 return true;
519 }
520 }
521 }
522 return false;
523 }
524
525 // convert the external string or reflective type to an internal signature
lookup_signature(oop type_str,bool intern_if_not_found,TRAPS)526 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
527 if (java_lang_invoke_MethodType::is_instance(type_str)) {
528 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
529 } else if (java_lang_Class::is_instance(type_str)) {
530 return java_lang_Class::as_signature(type_str, false);
531 } else if (java_lang_String::is_instance_inlined(type_str)) {
532 if (intern_if_not_found) {
533 return java_lang_String::as_symbol(type_str);
534 } else {
535 return java_lang_String::as_symbol_or_null(type_str);
536 }
537 } else {
538 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
539 }
540 }
541
542 static const char OBJ_SIG[] = "Ljava/lang/Object;";
543 enum { OBJ_SIG_LEN = 18 };
544
is_basic_type_signature(Symbol * sig)545 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
546 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
547 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
548 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) {
549 switch (ss.type()) {
550 case T_OBJECT:
551 // only java/lang/Object is valid here
552 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, OBJ_SIG_LEN) != 0)
553 return false;
554 break;
555 case T_VOID:
556 case T_INT:
557 case T_LONG:
558 case T_FLOAT:
559 case T_DOUBLE:
560 break;
561 default:
562 // subword types (T_BYTE etc.), Q-descriptors, arrays
563 return false;
564 }
565 }
566 return true;
567 }
568
lookup_basic_type_signature(Symbol * sig,bool keep_last_arg,TRAPS)569 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
570 Symbol* bsig = NULL;
571 if (sig == NULL) {
572 return sig;
573 } else if (is_basic_type_signature(sig)) {
574 sig->increment_refcount();
575 return sig; // that was easy
576 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) {
577 BasicType bt = Signature::basic_type(sig);
578 if (is_subword_type(bt)) {
579 bsig = vmSymbols::int_signature();
580 } else {
581 assert(is_reference_type(bt), "is_basic_type_signature was false");
582 bsig = vmSymbols::object_signature();
583 }
584 } else {
585 ResourceMark rm;
586 stringStream buffer(128);
587 buffer.put(JVM_SIGNATURE_FUNC);
588 int arg_pos = 0, keep_arg_pos = -1;
589 if (keep_last_arg)
590 keep_arg_pos = ArgumentCount(sig).size() - 1;
591 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
592 BasicType bt = ss.type();
593 size_t this_arg_pos = buffer.size();
594 if (ss.at_return_type()) {
595 buffer.put(JVM_SIGNATURE_ENDFUNC);
596 }
597 if (arg_pos == keep_arg_pos) {
598 buffer.write((char*) ss.raw_bytes(),
599 (int) ss.raw_length());
600 } else if (is_reference_type(bt)) {
601 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
602 } else {
603 if (is_subword_type(bt))
604 bt = T_INT;
605 buffer.put(type2char(bt));
606 }
607 arg_pos++;
608 }
609 const char* sigstr = buffer.base();
610 int siglen = (int) buffer.size();
611 bsig = SymbolTable::new_symbol(sigstr, siglen);
612 }
613 assert(is_basic_type_signature(bsig) ||
614 // detune assert in case the injected argument is not a basic type:
615 keep_last_arg, "");
616 return bsig;
617 }
618
print_as_basic_type_signature_on(outputStream * st,Symbol * sig)619 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
620 Symbol* sig) {
621 st = st ? st : tty;
622 bool prev_type = false;
623 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC);
624 if (is_method) st->put(JVM_SIGNATURE_FUNC);
625 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
626 if (ss.at_return_type())
627 st->put(JVM_SIGNATURE_ENDFUNC);
628 else if (prev_type)
629 st->put(',');
630 const char* cp = (const char*) ss.raw_bytes();
631 if (ss.is_array()) {
632 st->put(JVM_SIGNATURE_ARRAY);
633 if (ss.array_prefix_length() == 1)
634 st->put(cp[1]);
635 else
636 st->put(JVM_SIGNATURE_CLASS);
637 } else {
638 st->put(cp[0]);
639 }
640 }
641 }
642
643
644
object_java_mirror()645 static oop object_java_mirror() {
646 return SystemDictionary::Object_klass()->java_mirror();
647 }
648
field_name_or_null(Symbol * s)649 oop MethodHandles::field_name_or_null(Symbol* s) {
650 if (s == NULL) return NULL;
651 return StringTable::lookup(s);
652 }
653
field_signature_type_or_null(Symbol * s)654 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
655 if (s == NULL) return NULL;
656 BasicType bt = Signature::basic_type(s);
657 if (is_java_primitive(bt)) {
658 assert(s->utf8_length() == 1, "");
659 return java_lang_Class::primitive_mirror(bt);
660 }
661 // Here are some more short cuts for common types.
662 // They are optional, since reference types can be resolved lazily.
663 if (bt == T_OBJECT) {
664 if (s == vmSymbols::object_signature()) {
665 return object_java_mirror();
666 } else if (s == vmSymbols::class_signature()) {
667 return SystemDictionary::Class_klass()->java_mirror();
668 } else if (s == vmSymbols::string_signature()) {
669 return SystemDictionary::String_klass()->java_mirror();
670 }
671 }
672 return NULL;
673 }
674
675
676 // An unresolved member name is a mere symbolic reference.
677 // Resolving it plants a vmtarget/vmindex in it,
678 // which refers directly to JVM internals.
resolve_MemberName(Handle mname,Klass * caller,bool speculative_resolve,TRAPS)679 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller,
680 bool speculative_resolve, TRAPS) {
681 Handle empty;
682 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
683
684 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
685 // Already resolved.
686 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
687 assert(vmindex >= Method::nonvirtual_vtable_index, "");
688 return mname;
689 }
690
691 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
692 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
693 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
694 int flags = java_lang_invoke_MemberName::flags(mname());
695 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
696 if (!ref_kind_is_valid(ref_kind)) {
697 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
698 }
699
700 DEBUG_ONLY(int old_vmindex);
701 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
702
703 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
704 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
705 }
706
707 InstanceKlass* defc = NULL;
708 {
709 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
710 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
711 if (!defc_klass->is_instance_klass()) {
712 if (!defc_klass->is_array_klass()) return empty;
713 defc_klass = SystemDictionary::Object_klass();
714 }
715 defc = InstanceKlass::cast(defc_klass);
716 }
717 if (defc == NULL) {
718 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
719 }
720 defc->link_class(CHECK_(empty)); // possible safepoint
721
722 // convert the external string name to an internal symbol
723 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
724 if (name == NULL) return empty; // no such name
725 if (name == vmSymbols::class_initializer_name())
726 return empty; // illegal name
727
728 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
729 if ((flags & ALL_KINDS) == IS_METHOD &&
730 (defc == SystemDictionary::MethodHandle_klass() || defc == SystemDictionary::VarHandle_klass()) &&
731 (ref_kind == JVM_REF_invokeVirtual ||
732 ref_kind == JVM_REF_invokeSpecial ||
733 // static invocation mode is required for _linkToVirtual, etc.:
734 ref_kind == JVM_REF_invokeStatic)) {
735 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
736 if (iid != vmIntrinsics::_none &&
737 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
738 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
739 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
740 mh_invoke_id = iid;
741 }
742 }
743
744 // convert the external string or reflective type to an internal signature
745 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
746 if (type == NULL) return empty; // no such signature exists in the VM
747
748 LinkInfo::AccessCheck access_check = caller != NULL ?
749 LinkInfo::needs_access_check :
750 LinkInfo::skip_access_check;
751
752 // Time to do the lookup.
753 switch (flags & ALL_KINDS) {
754 case IS_METHOD:
755 {
756 CallInfo result;
757 LinkInfo link_info(defc, name, type, caller, access_check);
758 {
759 assert(!HAS_PENDING_EXCEPTION, "");
760 if (ref_kind == JVM_REF_invokeStatic) {
761 LinkResolver::resolve_static_call(result,
762 link_info, false, THREAD);
763 } else if (ref_kind == JVM_REF_invokeInterface) {
764 LinkResolver::resolve_interface_call(result, Handle(), defc,
765 link_info, false, THREAD);
766 } else if (mh_invoke_id != vmIntrinsics::_none) {
767 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
768 LinkResolver::resolve_handle_call(result, link_info, THREAD);
769 } else if (ref_kind == JVM_REF_invokeSpecial) {
770 LinkResolver::resolve_special_call(result, Handle(),
771 link_info, THREAD);
772 } else if (ref_kind == JVM_REF_invokeVirtual) {
773 LinkResolver::resolve_virtual_call(result, Handle(), defc,
774 link_info, false, THREAD);
775 } else {
776 assert(false, "ref_kind=%d", ref_kind);
777 }
778 if (HAS_PENDING_EXCEPTION) {
779 if (speculative_resolve) {
780 CLEAR_PENDING_EXCEPTION;
781 }
782 return empty;
783 }
784 }
785 if (result.resolved_appendix().not_null()) {
786 // The resolved MemberName must not be accompanied by an appendix argument,
787 // since there is no way to bind this value into the MemberName.
788 // Caller is responsible to prevent this from happening.
789 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
790 }
791 result.set_resolved_method_name(CHECK_(empty));
792 oop mname2 = init_method_MemberName(mname, result);
793 return Handle(THREAD, mname2);
794 }
795 case IS_CONSTRUCTOR:
796 {
797 CallInfo result;
798 LinkInfo link_info(defc, name, type, caller, access_check);
799 {
800 assert(!HAS_PENDING_EXCEPTION, "");
801 if (name == vmSymbols::object_initializer_name()) {
802 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
803 } else {
804 break; // will throw after end of switch
805 }
806 if (HAS_PENDING_EXCEPTION) {
807 if (speculative_resolve) {
808 CLEAR_PENDING_EXCEPTION;
809 }
810 return empty;
811 }
812 }
813 assert(result.is_statically_bound(), "");
814 result.set_resolved_method_name(CHECK_(empty));
815 oop mname2 = init_method_MemberName(mname, result);
816 return Handle(THREAD, mname2);
817 }
818 case IS_FIELD:
819 {
820 fieldDescriptor result; // find_field initializes fd if found
821 {
822 assert(!HAS_PENDING_EXCEPTION, "");
823 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
824 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
825 if (HAS_PENDING_EXCEPTION) {
826 if (speculative_resolve) {
827 CLEAR_PENDING_EXCEPTION;
828 }
829 return empty;
830 }
831 }
832 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
833 return Handle(THREAD, mname2);
834 }
835 default:
836 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
837 }
838
839 return empty;
840 }
841
842 // Conversely, a member name which is only initialized from JVM internals
843 // may have null defc, name, and type fields.
844 // Resolving it plants a vmtarget/vmindex in it,
845 // which refers directly to JVM internals.
expand_MemberName(Handle mname,int suppress,TRAPS)846 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
847 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
848
849 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
850 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
851 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
852 int flags = java_lang_invoke_MemberName::flags(mname());
853
854 if (suppress != 0) {
855 if (suppress & _suppress_defc) have_defc = true;
856 if (suppress & _suppress_name) have_name = true;
857 if (suppress & _suppress_type) have_type = true;
858 }
859
860 if (have_defc && have_name && have_type) return; // nothing needed
861
862 switch (flags & ALL_KINDS) {
863 case IS_METHOD:
864 case IS_CONSTRUCTOR:
865 {
866 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
867 if (vmtarget == NULL) {
868 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
869 }
870 methodHandle m(THREAD, vmtarget);
871 DEBUG_ONLY(vmtarget = NULL); // safety
872 if (!have_defc) {
873 InstanceKlass* defc = m->method_holder();
874 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
875 }
876 if (!have_name) {
877 //not java_lang_String::create_from_symbol; let's intern member names
878 oop name = StringTable::intern(m->name(), CHECK);
879 java_lang_invoke_MemberName::set_name(mname(), name);
880 }
881 if (!have_type) {
882 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
883 java_lang_invoke_MemberName::set_type(mname(), type());
884 }
885 return;
886 }
887 case IS_FIELD:
888 {
889 oop clazz = java_lang_invoke_MemberName::clazz(mname());
890 if (clazz == NULL) {
891 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
892 }
893 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
894 DEBUG_ONLY(clazz = NULL); // safety
895 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
896 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
897 fieldDescriptor fd; // find_field initializes fd if found
898 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
899 break; // cannot expand
900 if (!have_name) {
901 //not java_lang_String::create_from_symbol; let's intern member names
902 oop name = StringTable::intern(fd.name(), CHECK);
903 java_lang_invoke_MemberName::set_name(mname(), name);
904 }
905 if (!have_type) {
906 // If it is a primitive field type, don't mess with short strings like "I".
907 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
908 if (type.is_null()) {
909 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
910 }
911 java_lang_invoke_MemberName::set_type(mname(), type());
912 }
913 return;
914 }
915 }
916 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
917 }
918
find_MemberNames(Klass * k,Symbol * name,Symbol * sig,int mflags,Klass * caller,int skip,objArrayHandle results,TRAPS)919 int MethodHandles::find_MemberNames(Klass* k,
920 Symbol* name, Symbol* sig,
921 int mflags, Klass* caller,
922 int skip, objArrayHandle results, TRAPS) {
923 // %%% take caller into account!
924
925 Thread* thread = Thread::current();
926
927 if (k == NULL || !k->is_instance_klass()) return -1;
928
929 int rfill = 0, rlimit = results->length(), rskip = skip;
930 // overflow measurement:
931 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
932
933 int match_flags = mflags;
934 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
935 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
936 bool local_only = !(search_superc | search_intfc);
937
938 if (name != NULL) {
939 if (name->utf8_length() == 0) return 0; // a match is not possible
940 }
941 if (sig != NULL) {
942 if (sig->starts_with(JVM_SIGNATURE_FUNC))
943 match_flags &= ~(IS_FIELD | IS_TYPE);
944 else
945 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
946 }
947
948 if ((match_flags & IS_TYPE) != 0) {
949 // NYI, and Core Reflection works quite well for this query
950 }
951
952 if ((match_flags & IS_FIELD) != 0) {
953 InstanceKlass* ik = InstanceKlass::cast(k);
954 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
955 if (name != NULL && st.name() != name)
956 continue;
957 if (sig != NULL && st.signature() != sig)
958 continue;
959 // passed the filters
960 if (rskip > 0) {
961 --rskip;
962 } else if (rfill < rlimit) {
963 Handle result(thread, results->obj_at(rfill++));
964 if (!java_lang_invoke_MemberName::is_instance(result()))
965 return -99; // caller bug!
966 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
967 if (saved != result())
968 results->obj_at_put(rfill-1, saved); // show saved instance to user
969 } else if (++overflow >= overflow_limit) {
970 match_flags = 0; break; // got tired of looking at overflow
971 }
972 }
973 }
974
975 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
976 // watch out for these guys:
977 Symbol* init_name = vmSymbols::object_initializer_name();
978 Symbol* clinit_name = vmSymbols::class_initializer_name();
979 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
980 bool negate_name_test = false;
981 // fix name so that it captures the intention of IS_CONSTRUCTOR
982 if (!(match_flags & IS_METHOD)) {
983 // constructors only
984 if (name == NULL) {
985 name = init_name;
986 } else if (name != init_name) {
987 return 0; // no constructors of this method name
988 }
989 } else if (!(match_flags & IS_CONSTRUCTOR)) {
990 // methods only
991 if (name == NULL) {
992 name = init_name;
993 negate_name_test = true; // if we see the name, we *omit* the entry
994 } else if (name == init_name) {
995 return 0; // no methods of this constructor name
996 }
997 } else {
998 // caller will accept either sort; no need to adjust name
999 }
1000 InstanceKlass* ik = InstanceKlass::cast(k);
1001 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
1002 Method* m = st.method();
1003 Symbol* m_name = m->name();
1004 if (m_name == clinit_name)
1005 continue;
1006 if (name != NULL && ((m_name != name) ^ negate_name_test))
1007 continue;
1008 if (sig != NULL && m->signature() != sig)
1009 continue;
1010 // passed the filters
1011 if (rskip > 0) {
1012 --rskip;
1013 } else if (rfill < rlimit) {
1014 Handle result(thread, results->obj_at(rfill++));
1015 if (!java_lang_invoke_MemberName::is_instance(result()))
1016 return -99; // caller bug!
1017 CallInfo info(m, NULL, CHECK_0);
1018 oop saved = MethodHandles::init_method_MemberName(result, info);
1019 if (saved != result())
1020 results->obj_at_put(rfill-1, saved); // show saved instance to user
1021 } else if (++overflow >= overflow_limit) {
1022 match_flags = 0; break; // got tired of looking at overflow
1023 }
1024 }
1025 }
1026
1027 // return number of elements we at leasted wanted to initialize
1028 return rfill + overflow;
1029 }
1030
add_dependent_nmethod(oop call_site,nmethod * nm)1031 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
1032 assert_locked_or_safepoint(CodeCache_lock);
1033
1034 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1035 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1036 // Try to purge stale entries on updates.
1037 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
1038 // in order to avoid memory leak, stale entries are purged whenever a dependency list
1039 // is changed (both on addition and removal). Though memory reclamation is delayed,
1040 // it avoids indefinite memory usage growth.
1041 deps.add_dependent_nmethod(nm);
1042 }
1043
remove_dependent_nmethod(oop call_site,nmethod * nm)1044 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
1045 assert_locked_or_safepoint(CodeCache_lock);
1046
1047 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1048 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1049 deps.remove_dependent_nmethod(nm);
1050 }
1051
clean_dependency_context(oop call_site)1052 void MethodHandles::clean_dependency_context(oop call_site) {
1053 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1054 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1055 deps.clean_unloading_dependents();
1056 }
1057
flush_dependent_nmethods(Handle call_site,Handle target)1058 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
1059 assert_lock_strong(Compile_lock);
1060
1061 int marked = 0;
1062 CallSiteDepChange changes(call_site, target);
1063 {
1064 NoSafepointVerifier nsv;
1065 MutexLocker mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1066
1067 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site());
1068 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1069 marked = deps.mark_dependent_nmethods(changes);
1070 }
1071 if (marked > 0) {
1072 // At least one nmethod has been marked for deoptimization.
1073 Deoptimization::deoptimize_all_marked();
1074 }
1075 }
1076
trace_method_handle_interpreter_entry(MacroAssembler * _masm,vmIntrinsics::ID iid)1077 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
1078 if (log_is_enabled(Info, methodhandles)) {
1079 const char* name = vmIntrinsics::name_at(iid);
1080 if (*name == '_') name += 1;
1081 const size_t len = strlen(name) + 50;
1082 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
1083 const char* suffix = "";
1084 if (is_signature_polymorphic(iid)) {
1085 if (is_signature_polymorphic_static(iid))
1086 suffix = "/static";
1087 else
1088 suffix = "/private";
1089 }
1090 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
1091 trace_method_handle(_masm, qname);
1092 // Note: Don't free the allocated char array because it's used
1093 // during runtime.
1094 }
1095 }
1096
1097 //
1098 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1099 // They are the private interface between this JVM and the HotSpot-specific
1100 // Java code that implements JSR 292 method handles.
1101 //
1102 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1103 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1104 //
1105
1106 #ifndef PRODUCT
1107 #define EACH_NAMED_CON(template, requirement) \
1108 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1109 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1110 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1111 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1112 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1113 template(java_lang_invoke_MemberName,MN_TRUSTED_FINAL) \
1114 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1115 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1116 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1117 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1118 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \
1119 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \
1120 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \
1121 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \
1122 /*end*/
1123
1124 #define IGNORE_REQ(req_expr) /* req_expr */
1125 #define ONE_PLUS(scope,value) 1+
1126 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1127 #define VALUE_COMMA(scope,value) scope::value,
1128 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1129 #define STRING_NULL(scope,value) #value "\0"
1130 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1131
advertise_con_value(int which)1132 static bool advertise_con_value(int which) {
1133 if (which < 0) return false;
1134 bool ok = true;
1135 int count = 0;
1136 #define INC_COUNT(scope,value) \
1137 ++count;
1138 #define CHECK_REQ(req_expr) \
1139 if (which < count) return ok; \
1140 ok = (req_expr);
1141 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1142 #undef INC_COUNT
1143 #undef CHECK_REQ
1144 assert(count == con_value_count, "");
1145 if (which < count) return ok;
1146 return false;
1147 }
1148
1149 #undef ONE_PLUS
1150 #undef VALUE_COMMA
1151 #undef STRING_NULL
1152 #undef EACH_NAMED_CON
1153 #endif // PRODUCT
1154
JVM_ENTRY(jint,MHN_getNamedCon (JNIEnv * env,jobject igcls,jint which,jobjectArray box_jh))1155 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1156 #ifndef PRODUCT
1157 if (advertise_con_value(which)) {
1158 assert(which >= 0 && which < con_value_count, "");
1159 int con = con_values[which];
1160 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1161 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1162 const char* str = &con_names[0];
1163 for (int i = 0; i < which; i++)
1164 str += strlen(str) + 1; // skip name and null
1165 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1166 box->obj_at_put(0, name);
1167 }
1168 return con;
1169 }
1170 #endif
1171 return 0;
1172 }
1173 JVM_END
1174
1175 // void init(MemberName self, AccessibleObject ref)
JVM_ENTRY(void,MHN_init_Mem (JNIEnv * env,jobject igcls,jobject mname_jh,jobject target_jh))1176 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1177 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1178 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1179 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1180 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1181 MethodHandles::init_MemberName(mname, target, CHECK);
1182 }
1183 JVM_END
1184
1185 // void expand(MemberName self)
JVM_ENTRY(void,MHN_expand_Mem (JNIEnv * env,jobject igcls,jobject mname_jh))1186 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1187 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1188 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1189 MethodHandles::expand_MemberName(mname, 0, CHECK);
1190 }
1191 JVM_END
1192
1193 // void resolve(MemberName self, Class<?> caller)
JVM_ENTRY(jobject,MHN_resolve_Mem (JNIEnv * env,jobject igcls,jobject mname_jh,jclass caller_jh,jboolean speculative_resolve))1194 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1195 jboolean speculative_resolve)) {
1196 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1197 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1198
1199 // The trusted Java code that calls this method should already have performed
1200 // access checks on behalf of the given caller. But, we can verify this.
1201 if (VerifyMethodHandles && caller_jh != NULL &&
1202 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1203 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1204 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1205 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1206 }
1207
1208 // Reflection::verify_class_access can only handle instance classes.
1209 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1210 // Emulate LinkResolver::check_klass_accessability.
1211 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1212 if (caller != SystemDictionary::Object_klass()
1213 && Reflection::verify_class_access(caller,
1214 InstanceKlass::cast(reference_klass),
1215 true) != Reflection::ACCESS_OK) {
1216 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1217 }
1218 }
1219 }
1220
1221 Klass* caller = caller_jh == NULL ? NULL :
1222 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1223 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, speculative_resolve == JNI_TRUE,
1224 CHECK_NULL);
1225
1226 if (resolved.is_null()) {
1227 int flags = java_lang_invoke_MemberName::flags(mname());
1228 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1229 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1230 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1231 }
1232 if (speculative_resolve) {
1233 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1234 return NULL;
1235 }
1236 if ((flags & ALL_KINDS) == IS_FIELD) {
1237 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1238 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1239 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1240 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1241 } else {
1242 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1243 }
1244 }
1245
1246 return JNIHandles::make_local(THREAD, resolved());
1247 }
1248 JVM_END
1249
find_member_field_offset(oop mname,bool must_be_static,TRAPS)1250 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1251 if (mname == NULL ||
1252 java_lang_invoke_MemberName::clazz(mname) == NULL) {
1253 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1254 } else {
1255 int flags = java_lang_invoke_MemberName::flags(mname);
1256 if ((flags & IS_FIELD) != 0 &&
1257 (must_be_static
1258 ? (flags & JVM_ACC_STATIC) != 0
1259 : (flags & JVM_ACC_STATIC) == 0)) {
1260 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1261 return (jlong) vmindex;
1262 }
1263 }
1264 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1265 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1266 return 0;
1267 }
1268
JVM_ENTRY(jlong,MHN_objectFieldOffset (JNIEnv * env,jobject igcls,jobject mname_jh))1269 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1270 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1271 }
1272 JVM_END
1273
JVM_ENTRY(jlong,MHN_staticFieldOffset (JNIEnv * env,jobject igcls,jobject mname_jh))1274 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1275 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1276 }
1277 JVM_END
1278
JVM_ENTRY(jobject,MHN_staticFieldBase (JNIEnv * env,jobject igcls,jobject mname_jh))1279 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1280 // use the other function to perform sanity checks:
1281 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1282 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1283 return JNIHandles::make_local(THREAD, clazz);
1284 }
1285 JVM_END
1286
JVM_ENTRY(jobject,MHN_getMemberVMInfo (JNIEnv * env,jobject igcls,jobject mname_jh))1287 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1288 if (mname_jh == NULL) return NULL;
1289 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1290 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1291 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1292 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1293 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1294 result->obj_at_put(0, x);
1295
1296 int flags = java_lang_invoke_MemberName::flags(mname());
1297 if ((flags & IS_FIELD) != 0) {
1298 x = java_lang_invoke_MemberName::clazz(mname());
1299 } else {
1300 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1301 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1302 x = mname();
1303 }
1304 result->obj_at_put(1, x);
1305 return JNIHandles::make_local(env, result());
1306 }
1307 JVM_END
1308
1309
1310
1311 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1312 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
JVM_ENTRY(jint,MHN_getMembers (JNIEnv * env,jobject igcls,jclass clazz_jh,jstring name_jh,jstring sig_jh,int mflags,jclass caller_jh,jint skip,jobjectArray results_jh))1313 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1314 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1315 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1316 if (clazz_jh == NULL || results_jh == NULL) return -1;
1317 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1318
1319 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1320 if (results.is_null() || !results->is_objArray()) return -1;
1321
1322 TempNewSymbol name = NULL;
1323 TempNewSymbol sig = NULL;
1324 if (name_jh != NULL) {
1325 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1326 if (name == NULL) return 0; // a match is not possible
1327 }
1328 if (sig_jh != NULL) {
1329 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1330 if (sig == NULL) return 0; // a match is not possible
1331 }
1332
1333 Klass* caller = NULL;
1334 if (caller_jh != NULL) {
1335 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1336 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1337 caller = java_lang_Class::as_Klass(caller_oop);
1338 }
1339
1340 if (name != NULL && sig != NULL && results.not_null()) {
1341 // try a direct resolve
1342 // %%% TO DO
1343 }
1344
1345 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1346 caller, skip, results, CHECK_0);
1347 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1348 return res;
1349 }
1350 JVM_END
1351
JVM_ENTRY(void,MHN_setCallSiteTargetNormal (JNIEnv * env,jobject igcls,jobject call_site_jh,jobject target_jh))1352 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1353 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1354 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1355 {
1356 // Walk all nmethods depending on this call site.
1357 MutexLocker mu(thread, Compile_lock);
1358 MethodHandles::flush_dependent_nmethods(call_site, target);
1359 java_lang_invoke_CallSite::set_target(call_site(), target());
1360 }
1361 }
1362 JVM_END
1363
JVM_ENTRY(void,MHN_setCallSiteTargetVolatile (JNIEnv * env,jobject igcls,jobject call_site_jh,jobject target_jh))1364 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1365 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1366 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1367 {
1368 // Walk all nmethods depending on this call site.
1369 MutexLocker mu(thread, Compile_lock);
1370 MethodHandles::flush_dependent_nmethods(call_site, target);
1371 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1372 }
1373 }
1374 JVM_END
1375
JVM_ENTRY(void,MHN_copyOutBootstrapArguments (JNIEnv * env,jobject igcls,jobject caller_jh,jintArray index_info_jh,jint start,jint end,jobjectArray buf_jh,jint pos,jboolean resolve,jobject ifna_jh))1376 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1377 jobject caller_jh, jintArray index_info_jh,
1378 jint start, jint end,
1379 jobjectArray buf_jh, jint pos,
1380 jboolean resolve, jobject ifna_jh)) {
1381 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1382 if (caller_k == NULL || !caller_k->is_instance_klass()) {
1383 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1384 }
1385 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1386 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1387 if (index_info_oop == NULL ||
1388 index_info_oop->klass() != Universe::intArrayKlassObj() ||
1389 typeArrayOop(index_info_oop)->length() < 2) {
1390 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1391 }
1392 typeArrayHandle index_info(THREAD, index_info_oop);
1393 int bss_index_in_pool = index_info->int_at(1);
1394 // While we are here, take a quick look at the index info:
1395 if (bss_index_in_pool <= 0 ||
1396 bss_index_in_pool >= caller->constants()->length() ||
1397 index_info->int_at(0)
1398 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1399 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1400 }
1401 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1402 if (start < 0) {
1403 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1404 if (start == pseudo_index) {
1405 if (start >= end || 0 > pos || pos >= buf->length()) break;
1406 oop pseudo_arg = NULL;
1407 switch (pseudo_index) {
1408 case -4: // bootstrap method
1409 {
1410 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool);
1411 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1412 break;
1413 }
1414 case -3: // name
1415 {
1416 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool);
1417 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1418 pseudo_arg = str();
1419 break;
1420 }
1421 case -2: // type
1422 {
1423 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool);
1424 Handle th;
1425 if (type->char_at(0) == JVM_SIGNATURE_FUNC) {
1426 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1427 } else {
1428 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1429 }
1430 pseudo_arg = th();
1431 break;
1432 }
1433 case -1: // argument count
1434 {
1435 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool);
1436 jvalue argc_value; argc_value.i = (jint)argc;
1437 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1438 break;
1439 }
1440 }
1441
1442 // Store the pseudo-argument, and advance the pointers.
1443 buf->obj_at_put(pos++, pseudo_arg);
1444 ++start;
1445 }
1446 }
1447 // When we are done with this there may be regular arguments to process too.
1448 }
1449 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1450 caller->constants()->
1451 copy_bootstrap_arguments_at(bss_index_in_pool,
1452 start, end, buf, pos,
1453 (resolve == JNI_TRUE), ifna, CHECK);
1454 }
1455 JVM_END
1456
1457 // It is called by a Cleaner object which ensures that dropped CallSites properly
1458 // deallocate their dependency information.
JVM_ENTRY(void,MHN_clearCallSiteContext (JNIEnv * env,jobject igcls,jobject context_jh))1459 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1460 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1461 {
1462 // Walk all nmethods depending on this call site.
1463 MutexLocker mu1(thread, Compile_lock);
1464
1465 int marked = 0;
1466 {
1467 NoSafepointVerifier nsv;
1468 MutexLocker mu2(THREAD, CodeCache_lock, Mutex::_no_safepoint_check_flag);
1469 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1470 marked = deps.remove_all_dependents();
1471 }
1472 if (marked > 0) {
1473 // At least one nmethod has been marked for deoptimization
1474 Deoptimization::deoptimize_all_marked();
1475 }
1476 }
1477 }
1478 JVM_END
1479
1480 /**
1481 * Throws a java/lang/UnsupportedOperationException unconditionally.
1482 * This is required by the specification of MethodHandle.invoke if
1483 * invoked directly.
1484 */
JVM_ENTRY(jobject,MH_invoke_UOE (JNIEnv * env,jobject mh,jobjectArray args))1485 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1486 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1487 return NULL;
1488 }
1489 JVM_END
1490
1491 /**
1492 * Throws a java/lang/UnsupportedOperationException unconditionally.
1493 * This is required by the specification of MethodHandle.invokeExact if
1494 * invoked directly.
1495 */
JVM_ENTRY(jobject,MH_invokeExact_UOE (JNIEnv * env,jobject mh,jobjectArray args))1496 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1497 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1498 return NULL;
1499 }
1500 JVM_END
1501
1502 /// JVM_RegisterMethodHandleMethods
1503
1504 #define LANG "Ljava/lang/"
1505 #define JLINV "Ljava/lang/invoke/"
1506
1507 #define OBJ LANG "Object;"
1508 #define CLS LANG "Class;"
1509 #define STRG LANG "String;"
1510 #define CS JLINV "CallSite;"
1511 #define MT JLINV "MethodType;"
1512 #define MH JLINV "MethodHandle;"
1513 #define MEM JLINV "MemberName;"
1514 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1515
1516 #define CC (char*) /*cast a literal from (const char*)*/
1517 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1518
1519 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1520 static JNINativeMethod MHN_methods[] = {
1521 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1522 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1523 {CC "resolve", CC "(" MEM "" CLS "Z)" MEM, FN_PTR(MHN_resolve_Mem)},
1524 // static native int getNamedCon(int which, Object[] name)
1525 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1526 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1527 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1528 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1529 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1530 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1531 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1532 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1533 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1534 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1535 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1536 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1537 };
1538
1539 static JNINativeMethod MH_methods[] = {
1540 // UnsupportedOperationException throwers
1541 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1542 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1543 };
1544
1545 /**
1546 * This one function is exported, used by NativeLookup.
1547 */
JVM_ENTRY(void,JVM_RegisterMethodHandleMethods (JNIEnv * env,jclass MHN_class))1548 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1549 assert(!MethodHandles::enabled(), "must not be enabled");
1550 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1551
1552 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1553 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1554
1555 {
1556 ThreadToNativeFromVM ttnfv(thread);
1557
1558 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1559 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1560 "register java.lang.invoke.MethodHandleNative natives");
1561
1562 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1563 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1564 "register java.lang.invoke.MethodHandle natives");
1565 }
1566
1567 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1568
1569 MethodHandles::set_enabled(true);
1570 }
1571 JVM_END
1572