1 /*
2 * Copyright (c) 2008, 2024, 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 "cds/cds_globals.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/systemDictionaryShared.hpp"
32 #include "classfile/vmClasses.hpp"
33 #include "code/codeCache.hpp"
34 #include "code/dependencyContext.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "interpreter/oopMapCache.hpp"
38 #include "interpreter/linkResolver.hpp"
39 #include "jvm_io.h"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/allocation.inline.hpp"
43 #include "memory/oopFactory.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "memory/universe.hpp"
46 #include "oops/klass.inline.hpp"
47 #include "oops/objArrayKlass.hpp"
48 #include "oops/objArrayOop.inline.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "oops/typeArrayOop.inline.hpp"
51 #include "prims/methodHandles.hpp"
52 #include "runtime/deoptimization.hpp"
53 #include "runtime/fieldDescriptor.inline.hpp"
54 #include "runtime/handles.inline.hpp"
55 #include "runtime/interfaceSupport.inline.hpp"
56 #include "runtime/java.hpp"
57 #include "runtime/javaCalls.hpp"
58 #include "runtime/jniHandles.inline.hpp"
59 #include "runtime/perfData.inline.hpp"
60 #include "runtime/timerTrace.hpp"
61 #include "runtime/reflection.hpp"
62 #include "runtime/safepointVerifiers.hpp"
63 #include "runtime/signature.hpp"
64 #include "runtime/stubRoutines.hpp"
65 #include "sanitizers/leak.hpp"
66 #include "services/management.hpp"
67 #include "utilities/exceptions.hpp"
68
69
70 /*
71 * JSR 292 reference implementation: method handles
72 * The JDK 7 reference implementation represented method handle
73 * combinations as chains. Each link in the chain had a "vmentry"
74 * field which pointed at a bit of assembly code which performed
75 * one transformation before dispatching to the next link in the chain.
76 *
77 * The current reference implementation pushes almost all code generation
78 * responsibility to (trusted) Java code. A method handle contains a
79 * pointer to its "LambdaForm", which embodies all details of the method
80 * handle's behavior. The LambdaForm is a normal Java object, managed
81 * by a runtime coded in Java.
82 */
83
84 bool MethodHandles::_enabled = false; // set true after successful native linkage
85 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = nullptr;
86
87 /**
88 * Generates method handle adapters. Returns 'false' if memory allocation
89 * failed and true otherwise.
90 */
91 void MethodHandles::generate_adapters() {
92 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
93 assert(_adapter_code == nullptr, "generate only once");
94
95 ResourceMark rm;
96 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
97 // The adapter entry is required to be aligned to CodeEntryAlignment.
98 // So we need additional bytes due to alignment.
99 int adapter_num = (int)Interpreter::method_handle_invoke_LAST - (int)Interpreter::method_handle_invoke_FIRST + 1;
100 int max_aligned_bytes = adapter_num * CodeEntryAlignment;
101 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size + max_aligned_bytes);
102 CodeBuffer code(_adapter_code);
103 MethodHandlesAdapterGenerator g(&code);
104 g.generate();
105 code.log_section_sizes("MethodHandlesAdapterBlob");
106 }
107
108 //------------------------------------------------------------------------------
109 // MethodHandlesAdapterGenerator::generate
110 //
111 void MethodHandlesAdapterGenerator::generate() {
112 // Generate generic method handle adapters.
113 // Generate interpreter entries
114 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
115 mk <= Interpreter::method_handle_invoke_LAST;
116 mk = Interpreter::MethodKind(1 + (int)mk)) {
117 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
118 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
119 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
120 if (entry != nullptr) {
121 Interpreter::set_entry_for_kind(mk, entry);
122 }
123 // If the entry is not set, it will throw AbstractMethodError.
124 }
125 }
126
127 void MethodHandles::set_enabled(bool z) {
128 if (_enabled != z) {
129 guarantee(z, "can only enable once");
130 _enabled = z;
131 }
132 }
133
134 // MemberName support
135
136 // import java_lang_invoke_MemberName.*
137 enum {
138 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
139 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
140 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
141 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
142 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
143 TRUSTED_FINAL = java_lang_invoke_MemberName::MN_TRUSTED_FINAL,
144 HIDDEN_MEMBER = java_lang_invoke_MemberName::MN_HIDDEN_MEMBER,
145 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
146 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
147 LM_UNCONDITIONAL = java_lang_invoke_MemberName::MN_UNCONDITIONAL_MODE,
148 LM_MODULE = java_lang_invoke_MemberName::MN_MODULE_MODE,
149 LM_TRUSTED = java_lang_invoke_MemberName::MN_TRUSTED_MODE,
150 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
151 };
152
153 int MethodHandles::ref_kind_to_flags(int ref_kind) {
154 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
155 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
156 if (ref_kind_is_field(ref_kind)) {
157 flags |= IS_FIELD;
158 } else if (ref_kind_is_method(ref_kind)) {
159 flags |= IS_METHOD;
160 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
161 flags |= IS_CONSTRUCTOR;
162 }
163 return flags;
164 }
165
166 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
167 Handle empty;
168 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
169 if (!java_lang_String::is_instance(type())) {
170 return type; // already resolved
171 }
172 Symbol* signature = java_lang_String::as_symbol_or_null(type());
173 if (signature == nullptr) {
174 return empty; // no such signature exists in the VM
175 }
176 Handle resolved;
177 int flags = java_lang_invoke_MemberName::flags(mname());
178 switch (flags & ALL_KINDS) {
179 case IS_METHOD:
180 case IS_CONSTRUCTOR:
181 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
182 break;
183 case IS_FIELD:
184 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
185 break;
186 default:
187 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
188 }
189 if (resolved.is_null()) {
190 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
191 }
192 return resolved;
193 }
194
195 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
196 // This method is used from java.lang.invoke.MemberName constructors.
197 // It fills in the new MemberName from a java.lang.reflect.Member.
198 oop target_oop = target();
199 Klass* target_klass = target_oop->klass();
200 if (target_klass == vmClasses::reflect_Field_klass()) {
201 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
202 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
203 Klass* k = java_lang_Class::as_Klass(clazz);
204 if (k != nullptr && k->is_instance_klass()) {
205 fieldDescriptor fd(InstanceKlass::cast(k), slot);
206 oop mname2 = init_field_MemberName(mname, fd);
207 if (mname2 != nullptr) {
208 // Since we have the reified name and type handy, add them to the result.
209 if (java_lang_invoke_MemberName::name(mname2) == nullptr)
210 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
211 if (java_lang_invoke_MemberName::type(mname2) == nullptr)
212 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
213 }
214 return mname2;
215 }
216 } else if (target_klass == vmClasses::reflect_Method_klass()) {
217 oop clazz = java_lang_reflect_Method::clazz(target_oop);
218 int slot = java_lang_reflect_Method::slot(target_oop);
219 Klass* k = java_lang_Class::as_Klass(clazz);
220 if (k != nullptr && k->is_instance_klass()) {
221 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
222 if (m == nullptr || is_signature_polymorphic(m->intrinsic_id()))
223 return nullptr; // do not resolve unless there is a concrete signature
224 CallInfo info(m, k, CHECK_NULL);
225 return init_method_MemberName(mname, info);
226 }
227 } else if (target_klass == vmClasses::reflect_Constructor_klass()) {
228 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
229 int slot = java_lang_reflect_Constructor::slot(target_oop);
230 Klass* k = java_lang_Class::as_Klass(clazz);
231 if (k != nullptr && k->is_instance_klass()) {
232 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
233 if (m == nullptr) return nullptr;
234 CallInfo info(m, k, CHECK_NULL);
235 return init_method_MemberName(mname, info);
236 }
237 }
238 return nullptr;
239 }
240
241 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
242 assert(info.resolved_appendix().is_null(), "only normal methods here");
243 methodHandle m(Thread::current(), info.resolved_method());
244 assert(m.not_null(), "null method handle");
245 InstanceKlass* m_klass = m->method_holder();
246 assert(m_klass != nullptr, "null holder for method handle");
247 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
248 int vmindex = Method::invalid_vtable_index;
249 LogTarget(Debug, methodhandles, indy) lt_indy;
250
251 switch (info.call_kind()) {
252 case CallInfo::itable_call:
253 vmindex = info.itable_index();
254 // More importantly, the itable index only works with the method holder.
255 assert(m_klass->verify_itable_index(vmindex), "");
256 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
257 if (lt_indy.is_enabled()) {
258 ResourceMark rm;
259 LogStream ls(lt_indy);
260 ls.print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
261 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
262 vmindex);
263 m->access_flags().print_on(&ls);
264 if (!m->is_abstract()) {
265 if (!m->is_private()) {
266 ls.print("default");
267 }
268 else {
269 ls.print("private-intf");
270 }
271 }
272 ls.cr();
273 }
274 break;
275
276 case CallInfo::vtable_call:
277 vmindex = info.vtable_index();
278 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
279 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
280 if (m_klass->is_interface()) {
281 // This is a vtable call to an interface method (abstract "miranda method" or default method).
282 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
283 // (LinkResolver should help us figure this out.)
284 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass");
285 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass());
286 if (m_klass_non_interface->is_interface()) {
287 m_klass_non_interface = vmClasses::Object_klass();
288 #ifdef ASSERT
289 { ResourceMark rm;
290 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
291 assert(m->name() == m2->name() && m->signature() == m2->signature(),
292 "at %d, %s != %s", vmindex,
293 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
294 }
295 #endif //ASSERT
296 }
297 if (!m->is_public()) {
298 assert(m->is_public(), "virtual call must be to public interface method");
299 return nullptr; // elicit an error later in product build
300 }
301 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
302 m_klass = m_klass_non_interface;
303 }
304 if (lt_indy.is_enabled()) {
305 ResourceMark rm;
306 LogStream ls(lt_indy);
307 ls.print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
308 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
309 m_klass->internal_name(), vmindex);
310 m->access_flags().print_on(&ls);
311 if (m->is_default_method()) {
312 ls.print("default");
313 }
314 ls.cr();
315 }
316 break;
317
318 case CallInfo::direct_call:
319 vmindex = Method::nonvirtual_vtable_index;
320 if (m->is_static()) {
321 assert(!m->is_static_initializer(), "Cannot be static initializer");
322 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
323 } else if (m->is_object_initializer()) {
324 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
325 } else {
326 // "special" reflects that this is a direct call, not that it
327 // necessarily originates from an invokespecial. We can also do
328 // direct calls for private and/or final non-static methods.
329 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
330 }
331 break;
332
333 default: assert(false, "bad CallInfo"); return nullptr;
334 }
335
336 // @CallerSensitive annotation detected
337 if (m->caller_sensitive()) {
338 flags |= CALLER_SENSITIVE;
339 }
340
341 Handle resolved_method = info.resolved_method_name();
342 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(),
343 "Should not change after link resolution");
344
345 oop mname_oop = mname();
346 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
347 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
348 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
349 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
350 // Note: name and type can be lazily computed by resolve_MemberName,
351 // if Java code needs them as resolved String and MethodType objects.
352 // If relevant, the vtable or itable value is stored as vmindex.
353 // This is done eagerly, since it is readily available without
354 // constructing any new objects.
355 return mname();
356 }
357
358 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
359 InstanceKlass* ik = fd.field_holder();
360 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
361 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
362 if (fd.is_trusted_final()) flags |= TRUSTED_FINAL;
363 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
364 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
365
366 oop mname_oop = mname();
367 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
368 java_lang_invoke_MemberName::set_method (mname_oop, nullptr);
369 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
370 java_lang_invoke_MemberName::set_clazz (mname_oop, ik->java_mirror());
371
372 oop type = field_signature_type_or_null(fd.signature());
373 oop name = field_name_or_null(fd.name());
374 if (name != nullptr)
375 java_lang_invoke_MemberName::set_name(mname_oop, name);
376 if (type != nullptr)
377 java_lang_invoke_MemberName::set_type(mname_oop, type);
378 // Note: name and type can be lazily computed by resolve_MemberName,
379 // if Java code needs them as resolved String and Class objects.
380 // Note that the incoming type oop might be pre-resolved (non-null).
381 // The base clazz and field offset (vmindex) must be eagerly stored,
382 // because they unambiguously identify the field.
383 // Although the fieldDescriptor::_index would also identify the field,
384 // we do not use it, because it is harder to decode.
385 // TO DO: maybe intern mname_oop
386 return mname();
387 }
388
389 // JVM 2.9 Special Methods:
390 // A method is signature polymorphic if and only if all of the following conditions hold :
391 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
392 // * It has a single formal parameter of type Object[].
393 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
394 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
395 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
396 if (klass == nullptr)
397 return false;
398 // The following test will fail spuriously during bootstrap of MethodHandle itself:
399 // if (klass != vmClasses::MethodHandle_klass())
400 // Test the name instead:
401 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
402 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
403 return false;
404 }
405
406 // Look up signature polymorphic method with polymorphic return type
407 Symbol* poly_sig = vmSymbols::object_array_object_signature();
408 InstanceKlass* iklass = InstanceKlass::cast(klass);
409 Method* m = iklass->find_method(name, poly_sig);
410 if (m != nullptr) {
411 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
412 int flags = m->access_flags().as_int();
413 if ((flags & required) == required) {
414 return true;
415 }
416 }
417
418 // Look up signature polymorphic method with non-polymorphic (non Object) return type
419 int me;
420 int ms = iklass->find_method_by_name(name, &me);
421 if (ms == -1) return false;
422 for (; ms < me; ms++) {
423 Method* m = iklass->methods()->at(ms);
424 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
425 int flags = m->access_flags().as_int();
426 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
427 return true;
428 }
429 }
430 return false;
431 }
432
433
434 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
435 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
436 switch (iid) {
437 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
438 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
439 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
440 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
441 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
442 case vmIntrinsics::_linkToNative: return vmSymbols::linkToNative_name();
443 default:
444 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
445 }
446 }
447
448 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
449 switch(id) {
450 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
451 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
452 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
453 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
454 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
455 default:
456 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
457 }
458 }
459
460 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
461 switch (iid) {
462 case vmIntrinsics::_invokeBasic: return 0;
463 case vmIntrinsics::_linkToNative: return 0;
464 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
465 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
466 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
467 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
468 default:
469 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
470 }
471 }
472
473 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
474 vmSymbolID name_id = vmSymbols::find_sid(name);
475 switch (name_id) {
476 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
477 case VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
478 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
479 case VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
480
481 // There is one static signature-polymorphic method for each JVM invocation mode.
482 case VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
483 case VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
484 case VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
485 case VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
486 case VM_SYMBOL_ENUM_NAME(linkToNative_name): return vmIntrinsics::_linkToNative;
487 default: break;
488 }
489
490 // Cover the case of invokeExact and any future variants of invokeFoo.
491 Klass* mh_klass = vmClasses::klass_at(VM_CLASS_ID(MethodHandle_klass));
492 if (mh_klass != nullptr && is_method_handle_invoke_name(mh_klass, name)) {
493 return vmIntrinsics::_invokeGeneric;
494 }
495
496 // Cover the case of methods on VarHandle.
497 Klass* vh_klass = vmClasses::klass_at(VM_CLASS_ID(VarHandle_klass));
498 if (vh_klass != nullptr && is_method_handle_invoke_name(vh_klass, name)) {
499 return vmIntrinsics::_invokeGeneric;
500 }
501
502 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
503 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
504 return vmIntrinsics::_none;
505 }
506
507 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
508 if (klass != nullptr &&
509 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
510 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
511 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
512 if (iid != vmIntrinsics::_none)
513 return iid;
514 if (is_method_handle_invoke_name(klass, name))
515 return vmIntrinsics::_invokeGeneric;
516 }
517 return vmIntrinsics::_none;
518 }
519
520 // Returns true if method is signature polymorphic and public
521 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
522 if (is_signature_polymorphic_name(klass, name)) {
523 InstanceKlass* iklass = InstanceKlass::cast(klass);
524 int me;
525 int ms = iklass->find_method_by_name(name, &me);
526 assert(ms != -1, "");
527 for (; ms < me; ms++) {
528 Method* m = iklass->methods()->at(ms);
529 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
530 int flags = m->access_flags().as_int();
531 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
532 return true;
533 }
534 }
535 }
536 return false;
537 }
538
539 // convert the external string or reflective type to an internal signature
540 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
541 if (java_lang_invoke_MethodType::is_instance(type_str)) {
542 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
543 } else if (java_lang_Class::is_instance(type_str)) {
544 return java_lang_Class::as_signature(type_str, false);
545 } else if (java_lang_String::is_instance(type_str)) {
546 if (intern_if_not_found) {
547 return java_lang_String::as_symbol(type_str);
548 } else {
549 return java_lang_String::as_symbol_or_null(type_str);
550 }
551 } else {
552 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", nullptr);
553 }
554 }
555
556 static const char OBJ_SIG[] = "Ljava/lang/Object;";
557 enum { OBJ_SIG_LEN = 18 };
558
559 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
560 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
561 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
562 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) {
563 switch (ss.type()) {
564 case T_OBJECT:
565 // only java/lang/Object is valid here
566 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, OBJ_SIG_LEN) != 0)
567 return false;
568 break;
569 case T_VOID:
570 case T_INT:
571 case T_LONG:
572 case T_FLOAT:
573 case T_DOUBLE:
574 break;
575 default:
576 // subword types (T_BYTE etc.), Q-descriptors, arrays
577 return false;
578 }
579 }
580 return true;
581 }
582
583 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg) {
584 Symbol* bsig = nullptr;
585 if (sig == nullptr) {
586 return sig;
587 } else if (is_basic_type_signature(sig)) {
588 sig->increment_refcount();
589 return sig; // that was easy
590 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) {
591 BasicType bt = Signature::basic_type(sig);
592 if (is_subword_type(bt)) {
593 bsig = vmSymbols::int_signature();
594 } else {
595 assert(is_reference_type(bt), "is_basic_type_signature was false");
596 bsig = vmSymbols::object_signature();
597 }
598 } else {
599 ResourceMark rm;
600 stringStream buffer(128);
601 buffer.put(JVM_SIGNATURE_FUNC);
602 int arg_pos = 0, keep_arg_pos = -1;
603 if (keep_last_arg)
604 keep_arg_pos = ArgumentCount(sig).size() - 1;
605 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
606 BasicType bt = ss.type();
607 size_t this_arg_pos = buffer.size();
608 if (ss.at_return_type()) {
609 buffer.put(JVM_SIGNATURE_ENDFUNC);
610 }
611 if (arg_pos == keep_arg_pos) {
612 buffer.write((char*) ss.raw_bytes(),
613 (int) ss.raw_length());
614 } else if (is_reference_type(bt)) {
615 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
616 } else {
617 if (is_subword_type(bt))
618 bt = T_INT;
619 buffer.put(type2char(bt));
620 }
621 arg_pos++;
622 }
623 const char* sigstr = buffer.base();
624 int siglen = (int) buffer.size();
625 bsig = SymbolTable::new_symbol(sigstr, siglen);
626 }
627 assert(is_basic_type_signature(bsig) ||
628 // detune assert in case the injected argument is not a basic type:
629 keep_last_arg, "");
630 return bsig;
631 }
632
633 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
634 Symbol* sig) {
635 st = st ? st : tty;
636 bool prev_type = false;
637 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC);
638 if (is_method) st->put(JVM_SIGNATURE_FUNC);
639 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
640 if (ss.at_return_type())
641 st->put(JVM_SIGNATURE_ENDFUNC);
642 else if (prev_type)
643 st->put(',');
644 const char* cp = (const char*) ss.raw_bytes();
645 if (ss.is_array()) {
646 st->put(JVM_SIGNATURE_ARRAY);
647 if (ss.array_prefix_length() == 1)
648 st->put(cp[1]);
649 else
650 st->put(JVM_SIGNATURE_CLASS);
651 } else {
652 st->put(cp[0]);
653 }
654 }
655 }
656
657
658
659 static oop object_java_mirror() {
660 return vmClasses::Object_klass()->java_mirror();
661 }
662
663 oop MethodHandles::field_name_or_null(Symbol* s) {
664 if (s == nullptr) return nullptr;
665 return StringTable::lookup(s);
666 }
667
668 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
669 if (s == nullptr) return nullptr;
670 BasicType bt = Signature::basic_type(s);
671 if (is_java_primitive(bt)) {
672 assert(s->utf8_length() == 1, "");
673 return java_lang_Class::primitive_mirror(bt);
674 }
675 // Here are some more short cuts for common types.
676 // They are optional, since reference types can be resolved lazily.
677 if (bt == T_OBJECT) {
678 if (s == vmSymbols::object_signature()) {
679 return object_java_mirror();
680 } else if (s == vmSymbols::class_signature()) {
681 return vmClasses::Class_klass()->java_mirror();
682 } else if (s == vmSymbols::string_signature()) {
683 return vmClasses::String_klass()->java_mirror();
684 }
685 }
686 return nullptr;
687 }
688
689 // An unresolved member name is a mere symbolic reference.
690 // Resolving it plants a vmtarget/vmindex in it,
691 // which refers directly to JVM internals.
692 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, int lookup_mode,
693 bool speculative_resolve, TRAPS) {
694 Handle empty;
695 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
696
697 if (java_lang_invoke_MemberName::vmtarget(mname()) != nullptr) {
698 // Already resolved.
699 DEBUG_ONLY(intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()));
700 assert(vmindex >= Method::nonvirtual_vtable_index, "");
701 return mname;
702 }
703
704 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
705 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
706 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
707 int flags = java_lang_invoke_MemberName::flags(mname());
708 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
709 if (!ref_kind_is_valid(ref_kind)) {
710 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
711 }
712
713 DEBUG_ONLY(intptr_t old_vmindex);
714 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
715
716 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
717 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
718 }
719
720 InstanceKlass* defc = nullptr;
721 {
722 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
723 if (defc_klass == nullptr) return empty; // a primitive; no resolution possible
724 if (!defc_klass->is_instance_klass()) {
725 if (!defc_klass->is_array_klass()) return empty;
726 defc_klass = vmClasses::Object_klass();
727 }
728 defc = InstanceKlass::cast(defc_klass);
729 }
730 if (defc == nullptr) {
731 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
732 }
733 defc->link_class(CHECK_(empty)); // possible safepoint
734
735 // convert the external string name to an internal symbol
736 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
737 if (name == nullptr) return empty; // no such name
738 if (name == vmSymbols::class_initializer_name())
739 return empty; // illegal name
740
741 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
742 if ((flags & ALL_KINDS) == IS_METHOD &&
743 (defc == vmClasses::MethodHandle_klass() || defc == vmClasses::VarHandle_klass()) &&
744 (ref_kind == JVM_REF_invokeVirtual ||
745 ref_kind == JVM_REF_invokeSpecial ||
746 // static invocation mode is required for _linkToVirtual, etc.:
747 ref_kind == JVM_REF_invokeStatic)) {
748 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
749 if (iid != vmIntrinsics::_none &&
750 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
751 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
752 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
753 mh_invoke_id = iid;
754 }
755 }
756
757 // convert the external string or reflective type to an internal signature
758 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
759 if (type == nullptr) return empty; // no such signature exists in the VM
760
761 // skip access check if it's trusted lookup
762 LinkInfo::AccessCheck access_check = caller != nullptr ?
763 LinkInfo::AccessCheck::required :
764 LinkInfo::AccessCheck::skip;
765 // skip loader constraints if it's trusted lookup or a public lookup
766 LinkInfo::LoaderConstraintCheck loader_constraint_check = (caller != nullptr && (lookup_mode & LM_UNCONDITIONAL) == 0) ?
767 LinkInfo::LoaderConstraintCheck::required :
768 LinkInfo::LoaderConstraintCheck::skip;
769
770 // Time to do the lookup.
771 switch (flags & ALL_KINDS) {
772 case IS_METHOD:
773 {
774 CallInfo result;
775 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
776 {
777 assert(!HAS_PENDING_EXCEPTION, "");
778 if (ref_kind == JVM_REF_invokeStatic) {
779 LinkResolver::resolve_static_call(result,
780 link_info, false, THREAD);
781 } else if (ref_kind == JVM_REF_invokeInterface) {
782 LinkResolver::resolve_interface_call(result, Handle(), defc,
783 link_info, false, THREAD);
784 } else if (mh_invoke_id != vmIntrinsics::_none) {
785 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
786 LinkResolver::resolve_handle_call(result, link_info, THREAD);
787 } else if (ref_kind == JVM_REF_invokeSpecial) {
788 LinkResolver::resolve_special_call(result, Handle(),
789 link_info, THREAD);
790 } else if (ref_kind == JVM_REF_invokeVirtual) {
791 LinkResolver::resolve_virtual_call(result, Handle(), defc,
792 link_info, false, THREAD);
793 } else {
794 assert(false, "ref_kind=%d", ref_kind);
795 }
796 if (HAS_PENDING_EXCEPTION) {
797 if (speculative_resolve) {
798 CLEAR_PENDING_EXCEPTION;
799 }
800 return empty;
801 }
802 }
803 if (result.resolved_appendix().not_null()) {
804 // The resolved MemberName must not be accompanied by an appendix argument,
805 // since there is no way to bind this value into the MemberName.
806 // Caller is responsible to prevent this from happening.
807 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
808 }
809 result.set_resolved_method_name(CHECK_(empty));
810 oop mname2 = init_method_MemberName(mname, result);
811 return Handle(THREAD, mname2);
812 }
813 case IS_CONSTRUCTOR:
814 {
815 CallInfo result;
816 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
817 {
818 assert(!HAS_PENDING_EXCEPTION, "");
819 if (name == vmSymbols::object_initializer_name()) {
820 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
821 } else {
822 break; // will throw after end of switch
823 }
824 if (HAS_PENDING_EXCEPTION) {
825 if (speculative_resolve) {
826 CLEAR_PENDING_EXCEPTION;
827 }
828 return empty;
829 }
830 }
831 assert(result.is_statically_bound(), "");
832 result.set_resolved_method_name(CHECK_(empty));
833 oop mname2 = init_method_MemberName(mname, result);
834 return Handle(THREAD, mname2);
835 }
836 case IS_FIELD:
837 {
838 fieldDescriptor result; // find_field initializes fd if found
839 {
840 assert(!HAS_PENDING_EXCEPTION, "");
841 LinkInfo link_info(defc, name, type, caller, LinkInfo::AccessCheck::skip, loader_constraint_check);
842 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
843 if (HAS_PENDING_EXCEPTION) {
844 if (speculative_resolve) {
845 CLEAR_PENDING_EXCEPTION;
846 }
847 return empty;
848 }
849 }
850 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
851 return Handle(THREAD, mname2);
852 }
853 default:
854 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
855 }
856
857 return empty;
858 }
859
860 // Conversely, a member name which is only initialized from JVM internals
861 // may have null defc, name, and type fields.
862 // Resolving it plants a vmtarget/vmindex in it,
863 // which refers directly to JVM internals.
864 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
865 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
866
867 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != nullptr);
868 bool have_name = (java_lang_invoke_MemberName::name(mname()) != nullptr);
869 bool have_type = (java_lang_invoke_MemberName::type(mname()) != nullptr);
870 int flags = java_lang_invoke_MemberName::flags(mname());
871
872 if (suppress != 0) {
873 if (suppress & _suppress_defc) have_defc = true;
874 if (suppress & _suppress_name) have_name = true;
875 if (suppress & _suppress_type) have_type = true;
876 }
877
878 if (have_defc && have_name && have_type) return; // nothing needed
879
880 switch (flags & ALL_KINDS) {
881 case IS_METHOD:
882 case IS_CONSTRUCTOR:
883 {
884 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
885 if (vmtarget == nullptr) {
886 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
887 }
888 methodHandle m(THREAD, vmtarget);
889 DEBUG_ONLY(vmtarget = nullptr); // safety
890 if (!have_defc) {
891 InstanceKlass* defc = m->method_holder();
892 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
893 }
894 if (!have_name) {
895 //not java_lang_String::create_from_symbol; let's intern member names
896 oop name = StringTable::intern(m->name(), CHECK);
897 java_lang_invoke_MemberName::set_name(mname(), name);
898 }
899 if (!have_type) {
900 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
901 java_lang_invoke_MemberName::set_type(mname(), type());
902 }
903 return;
904 }
905 case IS_FIELD:
906 {
907 oop clazz = java_lang_invoke_MemberName::clazz(mname());
908 if (clazz == nullptr) {
909 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
910 }
911 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
912 DEBUG_ONLY(clazz = nullptr); // safety
913 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
914 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
915 fieldDescriptor fd; // find_field initializes fd if found
916 if (!defc->find_field_from_offset(checked_cast<int>(vmindex), is_static, &fd))
917 break; // cannot expand
918 if (!have_name) {
919 //not java_lang_String::create_from_symbol; let's intern member names
920 oop name = StringTable::intern(fd.name(), CHECK);
921 java_lang_invoke_MemberName::set_name(mname(), name);
922 }
923 if (!have_type) {
924 // If it is a primitive field type, don't mess with short strings like "I".
925 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
926 if (type.is_null()) {
927 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
928 }
929 java_lang_invoke_MemberName::set_type(mname(), type());
930 }
931 return;
932 }
933 }
934 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
935 }
936
937 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
938 assert_locked_or_safepoint(CodeCache_lock);
939
940 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
941 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
942 // Try to purge stale entries on updates.
943 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
944 // in order to avoid memory leak, stale entries are purged whenever a dependency list
945 // is changed (both on addition and removal). Though memory reclamation is delayed,
946 // it avoids indefinite memory usage growth.
947 deps.add_dependent_nmethod(nm);
948 }
949
950 void MethodHandles::clean_dependency_context(oop call_site) {
951 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
952 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
953 deps.clean_unloading_dependents();
954 }
955
956 void MethodHandles::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, Handle call_site, Handle target) {
957 assert_lock_strong(Compile_lock);
958
959 CallSiteDepChange changes(call_site, target);
960 {
961 NoSafepointVerifier nsv;
962 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
963
964 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site());
965 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
966 deps.mark_dependent_nmethods(deopt_scope, changes);
967 }
968 }
969
970 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
971 if (log_is_enabled(Info, methodhandles)) {
972 const char* name = vmIntrinsics::name_at(iid);
973 if (*name == '_') name += 1;
974 const size_t len = strlen(name) + 50;
975 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
976 const char* suffix = "";
977 if (is_signature_polymorphic(iid)) {
978 if (is_signature_polymorphic_static(iid))
979 suffix = "/static";
980 else
981 suffix = "/private";
982 }
983 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
984 trace_method_handle(_masm, qname);
985 // LSan appears unable to keep track of qname, ignore it.
986 LSAN_IGNORE_OBJECT(qname);
987 // Note: Don't free the allocated char array because it's used
988 // during runtime.
989 }
990 }
991
992 //
993 // Here are the native methods in java.lang.invoke.MethodHandleNatives
994 // They are the private interface between this JVM and the HotSpot-specific
995 // Java code that implements JSR 292 method handles.
996 //
997 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
998 // that intrinsic (non-JNI) native methods are defined in HotSpot.
999 //
1000
1001 #ifndef PRODUCT
1002 #define EACH_NAMED_CON(template, requirement) \
1003 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1004 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1005 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1006 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1007 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1008 template(java_lang_invoke_MemberName,MN_TRUSTED_FINAL) \
1009 template(java_lang_invoke_MemberName,MN_HIDDEN_MEMBER) \
1010 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1011 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1012 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \
1013 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \
1014 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \
1015 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \
1016 template(java_lang_invoke_MemberName,MN_MODULE_MODE) \
1017 template(java_lang_invoke_MemberName,MN_UNCONDITIONAL_MODE) \
1018 template(java_lang_invoke_MemberName,MN_TRUSTED_MODE) \
1019 /*end*/
1020
1021 #define IGNORE_REQ(req_expr) /* req_expr */
1022 #define ONE_PLUS(scope,value) 1+
1023 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1024 #define VALUE_COMMA(scope,value) scope::value,
1025 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1026 #define STRING_NULL(scope,value) #value "\0"
1027 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1028
1029 static bool advertise_con_value(int which) {
1030 if (which < 0) return false;
1031 bool ok = true;
1032 int count = 0;
1033 #define INC_COUNT(scope,value) \
1034 ++count;
1035 #define CHECK_REQ(req_expr) \
1036 if (which < count) return ok; \
1037 ok = (req_expr);
1038 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1039 #undef INC_COUNT
1040 #undef CHECK_REQ
1041 assert(count == con_value_count, "");
1042 if (which < count) return ok;
1043 return false;
1044 }
1045
1046 #undef ONE_PLUS
1047 #undef VALUE_COMMA
1048 #undef STRING_NULL
1049 #undef EACH_NAMED_CON
1050 #endif // PRODUCT
1051
1052 JVM_ENTRY_PROF(jint, MHN_getNamedCon, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1053 #ifndef PRODUCT
1054 if (advertise_con_value(which)) {
1055 assert(which >= 0 && which < con_value_count, "");
1056 int con = con_values[which];
1057 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1058 if (box.not_null() && box->klass() == Universe::objectArrayKlass() && box->length() > 0) {
1059 const char* str = &con_names[0];
1060 for (int i = 0; i < which; i++)
1061 str += strlen(str) + 1; // skip name and null
1062 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1063 box->obj_at_put(0, name);
1064 }
1065 return con;
1066 }
1067 #endif
1068 return 0;
1069 }
1070 JVM_END
1071
1072 // void init(MemberName self, AccessibleObject ref)
1073 JVM_ENTRY_PROF(void, MHN_init_Mem, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1074 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1075 if (target_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1076 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1077 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1078 MethodHandles::init_MemberName(mname, target, CHECK);
1079 }
1080 JVM_END
1081
1082 // void expand(MemberName self)
1083 JVM_ENTRY_PROF(void, MHN_expand_Mem, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1084 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1085 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1086 MethodHandles::expand_MemberName(mname, 0, CHECK);
1087 }
1088 JVM_END
1089
1090 // void resolve(MemberName self, Class<?> caller)
1091 JVM_ENTRY_PROF(jobject, MHN_resolve_Mem, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1092 jint lookup_mode, jboolean speculative_resolve)) {
1093 if (mname_jh == nullptr) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1094 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1095
1096 // The trusted Java code that calls this method should already have performed
1097 // access checks on behalf of the given caller. But, we can verify this.
1098 // This only verifies from the context of the lookup class. It does not
1099 // verify the lookup context for a Lookup object teleported from one module
1100 // to another. Such Lookup object can only access the intersection of the set
1101 // of accessible classes from both lookup class and previous lookup class.
1102 if (VerifyMethodHandles && (lookup_mode & LM_TRUSTED) == LM_TRUSTED && caller_jh != nullptr &&
1103 java_lang_invoke_MemberName::clazz(mname()) != nullptr) {
1104 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1105 if (reference_klass != nullptr && reference_klass->is_objArray_klass()) {
1106 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1107 }
1108
1109 // Reflection::verify_class_access can only handle instance classes.
1110 if (reference_klass != nullptr && reference_klass->is_instance_klass()) {
1111 // Emulate LinkResolver::check_klass_accessability.
1112 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1113 // access check on behalf of the caller if this is not a public lookup
1114 // i.e. lookup mode is not UNCONDITIONAL
1115 if ((lookup_mode & LM_UNCONDITIONAL) == 0
1116 && Reflection::verify_class_access(caller,
1117 InstanceKlass::cast(reference_klass),
1118 true) != Reflection::ACCESS_OK) {
1119 ResourceMark rm(THREAD);
1120 stringStream ss;
1121 ss.print("caller %s tried to access %s", caller->class_in_module_of_loader(),
1122 reference_klass->class_in_module_of_loader());
1123 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), ss.as_string());
1124 }
1125 }
1126 }
1127
1128 Klass* caller = caller_jh == nullptr ? nullptr :
1129 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1130 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, lookup_mode,
1131 speculative_resolve == JNI_TRUE,
1132 CHECK_NULL);
1133
1134 if (resolved.is_null()) {
1135 int flags = java_lang_invoke_MemberName::flags(mname());
1136 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1137 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1138 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1139 }
1140 if (speculative_resolve) {
1141 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1142 return nullptr;
1143 }
1144 if ((flags & ALL_KINDS) == IS_FIELD) {
1145 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1146 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1147 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1148 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1149 } else {
1150 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1151 }
1152 }
1153
1154 return JNIHandles::make_local(THREAD, resolved());
1155 }
1156 JVM_END
1157
1158 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1159 if (mname == nullptr ||
1160 java_lang_invoke_MemberName::clazz(mname) == nullptr) {
1161 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1162 } else {
1163 int flags = java_lang_invoke_MemberName::flags(mname);
1164 if ((flags & IS_FIELD) != 0 &&
1165 (must_be_static
1166 ? (flags & JVM_ACC_STATIC) != 0
1167 : (flags & JVM_ACC_STATIC) == 0)) {
1168 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname);
1169 return (jlong) vmindex;
1170 }
1171 }
1172 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1173 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1174 return 0;
1175 }
1176
1177 JVM_ENTRY_PROF(jlong, MHN_objectFieldOffset, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1178 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1179 }
1180 JVM_END
1181
1182 JVM_ENTRY_PROF(jlong, MHN_staticFieldOffset, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1183 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1184 }
1185 JVM_END
1186
1187 JVM_ENTRY_PROF(jobject, MHN_staticFieldBase, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1188 // use the other function to perform sanity checks:
1189 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1190 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1191 return JNIHandles::make_local(THREAD, clazz);
1192 }
1193 JVM_END
1194
1195 JVM_ENTRY_PROF(jobject, MHN_getMemberVMInfo, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1196 if (mname_jh == nullptr) return nullptr;
1197 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1198 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1199 objArrayHandle result = oopFactory::new_objArray_handle(vmClasses::Object_klass(), 2, CHECK_NULL);
1200 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1201 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1202 result->obj_at_put(0, x);
1203
1204 int flags = java_lang_invoke_MemberName::flags(mname());
1205 if ((flags & IS_FIELD) != 0) {
1206 x = java_lang_invoke_MemberName::clazz(mname());
1207 } else {
1208 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1209 assert(vmtarget != nullptr && vmtarget->is_method(), "vmtarget is only method");
1210 x = mname();
1211 }
1212 result->obj_at_put(1, x);
1213 return JNIHandles::make_local(THREAD, result());
1214 }
1215 JVM_END
1216
1217 JVM_ENTRY_PROF(void, MHN_setCallSiteTargetNormal, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1218 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1219 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1220 DeoptimizationScope deopt_scope;
1221 {
1222 // Walk all nmethods depending on this call site.
1223 MutexLocker mu(thread, Compile_lock);
1224 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1225 java_lang_invoke_CallSite::set_target(call_site(), target());
1226 // This is assumed to be an 'atomic' operation by verification.
1227 // So keep it under lock for now.
1228 deopt_scope.deoptimize_marked();
1229 }
1230 }
1231 JVM_END
1232
1233 // Make sure the class is linked. If the class cannot be verified, etc, an exception will be thrown.
1234 JVM_ENTRY_PROF(void, MHN_checkArchivable, MHN_checkArchivable(JNIEnv *env, jobject igcls, jclass klass_jh)) {
1235 if (klass_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "klass is null"); }
1236
1237 if (CDSConfig::is_dumping_invokedynamic()) {
1238 Klass* klass = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(klass_jh));
1239 if (klass != nullptr && klass->is_instance_klass()) {
1240 // klass could be null during very early VM start-up
1241 InstanceKlass* ik = InstanceKlass::cast(klass);
1242 ik->link_class(THREAD); // exception will be thrown if unverifiable
1243 if (!ik->is_linked()) {
1244 assert(HAS_PENDING_EXCEPTION, "must be");
1245 ResourceMark rm;
1246 log_warning(cds)("Cannot use unverifiable class %s in MethodType",
1247 klass->external_name());
1248 return;
1249 }
1250
1251 if (SystemDictionaryShared::is_jfr_event_class(ik)) {
1252 ResourceMark rm;
1253 log_warning(cds)("Cannot use JFR event class %s in MethodType",
1254 klass->external_name());
1255 Exceptions::fthrow(THREAD_AND_LOCATION,
1256 vmSymbols::java_lang_NoClassDefFoundError(),
1257 "Class %s, or one of its supertypes, is a JFR event class",
1258 klass->external_name());
1259 }
1260 }
1261 }
1262 }
1263 JVM_END
1264
1265 JVM_ENTRY_PROF(void, MHN_setCallSiteTargetVolatile, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1266 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1267 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1268 DeoptimizationScope deopt_scope;
1269 {
1270 // Walk all nmethods depending on this call site.
1271 MutexLocker mu(thread, Compile_lock);
1272 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1273 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1274 // This is assumed to be an 'atomic' operation by verification.
1275 // So keep it under lock for now.
1276 deopt_scope.deoptimize_marked();
1277 }
1278 }
1279 JVM_END
1280
1281 JVM_ENTRY_PROF(void, MHN_copyOutBootstrapArguments, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1282 jobject caller_jh, jintArray index_info_jh,
1283 jint start, jint end,
1284 jobjectArray buf_jh, jint pos,
1285 jboolean resolve, jobject ifna_jh)) {
1286 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1287 if (caller_k == nullptr || !caller_k->is_instance_klass()) {
1288 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1289 }
1290 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1291 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1292 if (index_info_oop == nullptr ||
1293 index_info_oop->klass() != Universe::intArrayKlass() ||
1294 typeArrayOop(index_info_oop)->length() < 2) {
1295 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1296 }
1297 typeArrayHandle index_info(THREAD, index_info_oop);
1298 int bss_index_in_pool = index_info->int_at(1);
1299 // While we are here, take a quick look at the index info:
1300 if (bss_index_in_pool <= 0 ||
1301 bss_index_in_pool >= caller->constants()->length() ||
1302 index_info->int_at(0)
1303 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1304 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1305 }
1306 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1307 if (start < 0) {
1308 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1309 if (start == pseudo_index) {
1310 if (start >= end || 0 > pos || pos >= buf->length()) break;
1311 oop pseudo_arg = nullptr;
1312 switch (pseudo_index) {
1313 case -4: // bootstrap method
1314 {
1315 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool);
1316 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1317 break;
1318 }
1319 case -3: // name
1320 {
1321 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic);
1322 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1323 pseudo_arg = str();
1324 break;
1325 }
1326 case -2: // type
1327 {
1328 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic);
1329 Handle th;
1330 if (type->char_at(0) == JVM_SIGNATURE_FUNC) {
1331 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1332 } else {
1333 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1334 }
1335 pseudo_arg = th();
1336 break;
1337 }
1338 case -1: // argument count
1339 {
1340 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool);
1341 jvalue argc_value; argc_value.i = (jint)argc;
1342 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1343 break;
1344 }
1345 }
1346
1347 // Store the pseudo-argument, and advance the pointers.
1348 buf->obj_at_put(pos++, pseudo_arg);
1349 ++start;
1350 }
1351 }
1352 // When we are done with this there may be regular arguments to process too.
1353 }
1354 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1355 caller->constants()->
1356 copy_bootstrap_arguments_at(bss_index_in_pool,
1357 start, end, buf, pos,
1358 (resolve == JNI_TRUE), ifna, CHECK);
1359 }
1360 JVM_END
1361
1362 // It is called by a Cleaner object which ensures that dropped CallSites properly
1363 // deallocate their dependency information.
1364 JVM_ENTRY_PROF(void, MHN_clearCallSiteContext, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1365 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1366 DeoptimizationScope deopt_scope;
1367 {
1368 NoSafepointVerifier nsv;
1369 MutexLocker ml(THREAD, CodeCache_lock, Mutex::_no_safepoint_check_flag);
1370 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1371 deps.remove_and_mark_for_deoptimization_all_dependents(&deopt_scope);
1372 // This is assumed to be an 'atomic' operation by verification.
1373 // So keep it under lock for now.
1374 deopt_scope.deoptimize_marked();
1375 }
1376 }
1377 JVM_END
1378
1379 /**
1380 * Throws a java/lang/UnsupportedOperationException unconditionally.
1381 * This is required by the specification of MethodHandle.invoke if
1382 * invoked directly.
1383 */
1384 JVM_ENTRY_PROF(jobject, MH_invoke_UOE, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1385 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1386 return nullptr;
1387 }
1388 JVM_END
1389
1390 /**
1391 * Throws a java/lang/UnsupportedOperationException unconditionally.
1392 * This is required by the specification of MethodHandle.invokeExact if
1393 * invoked directly.
1394 */
1395 JVM_ENTRY_PROF(jobject, MH_invokeExact_UOE, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1396 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1397 return nullptr;
1398 }
1399 JVM_END
1400
1401 /**
1402 * Throws a java/lang/UnsupportedOperationException unconditionally.
1403 * This is required by the specification of VarHandle.{access-mode} if
1404 * invoked directly.
1405 */
1406 JVM_ENTRY(jobject, VH_UOE(JNIEnv* env, jobject vh, jobjectArray args)) {
1407 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "VarHandle access mode methods cannot be invoked reflectively");
1408 return nullptr;
1409 }
1410 JVM_END
1411
1412
1413 /// JVM_RegisterMethodHandleMethods
1414
1415 #define LANG "Ljava/lang/"
1416 #define JLINV "Ljava/lang/invoke/"
1417
1418 #define OBJ LANG "Object;"
1419 #define CLS LANG "Class;"
1420 #define STRG LANG "String;"
1421 #define CS JLINV "CallSite;"
1422 #define MT JLINV "MethodType;"
1423 #define MH JLINV "MethodHandle;"
1424 #define MEM JLINV "MemberName;"
1425 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1426
1427 #define CC (char*) /*cast a literal from (const char*)*/
1428 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1429
1430 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1431 static JNINativeMethod MHN_methods[] = {
1432 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1433 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1434 {CC "resolve", CC "(" MEM "" CLS "IZ)" MEM, FN_PTR(MHN_resolve_Mem)},
1435 {CC "checkArchivable", CC "(" CLS ")V", FN_PTR(MHN_checkArchivable)},
1436 // static native int getNamedCon(int which, Object[] name)
1437 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1438 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1439 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1440 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1441 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1442 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1443 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1444 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1445 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1446 };
1447
1448 static JNINativeMethod MH_methods[] = {
1449 // UnsupportedOperationException throwers
1450 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1451 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1452 };
1453 static JNINativeMethod VH_methods[] = {
1454 // UnsupportedOperationException throwers
1455 {CC "get", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1456 {CC "set", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1457 {CC "getVolatile", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1458 {CC "setVolatile", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1459 {CC "getAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1460 {CC "setRelease", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1461 {CC "getOpaque", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1462 {CC "setOpaque", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1463 {CC "compareAndSet", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1464 {CC "compareAndExchange", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1465 {CC "compareAndExchangeAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1466 {CC "compareAndExchangeRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1467 {CC "weakCompareAndSetPlain", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1468 {CC "weakCompareAndSet", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1469 {CC "weakCompareAndSetAcquire", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1470 {CC "weakCompareAndSetRelease", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1471 {CC "getAndSet", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1472 {CC "getAndSetAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1473 {CC "getAndSetRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1474 {CC "getAndAdd", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1475 {CC "getAndAddAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1476 {CC "getAndAddRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1477 {CC "getAndBitwiseOr", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1478 {CC "getAndBitwiseOrAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1479 {CC "getAndBitwiseOrRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1480 {CC "getAndBitwiseAnd", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1481 {CC "getAndBitwiseAndAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1482 {CC "getAndBitwiseAndRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1483 {CC "getAndBitwiseXor", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1484 {CC "getAndBitwiseXorAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1485 {CC "getAndBitwiseXorRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)}
1486 };
1487
1488 /**
1489 * This one function is exported, used by NativeLookup.
1490 */
1491 JVM_ENTRY_PROF(void, JVM_RegisterMethodHandleMethods, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1492 assert(!MethodHandles::enabled(), "must not be enabled");
1493 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
1494 assert(vmClasses::VarHandle_klass() != nullptr, "should be present");
1495
1496 oop mh_mirror = vmClasses::MethodHandle_klass()->java_mirror();
1497 oop vh_mirror = vmClasses::VarHandle_klass()->java_mirror();
1498 jclass MH_class = (jclass) JNIHandles::make_local(THREAD, mh_mirror);
1499 jclass VH_class = (jclass) JNIHandles::make_local(THREAD, vh_mirror);
1500
1501 {
1502 ThreadToNativeFromVM ttnfv(thread);
1503
1504 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1505 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1506 "register java.lang.invoke.MethodHandleNative natives");
1507
1508 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1509 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1510 "register java.lang.invoke.MethodHandle natives");
1511
1512 status = env->RegisterNatives(VH_class, VH_methods, sizeof(VH_methods)/sizeof(JNINativeMethod));
1513 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1514 "register java.lang.invoke.VarHandle natives");
1515 }
1516
1517 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1518
1519 MethodHandles::set_enabled(true);
1520 }
1521 JVM_END
1522
1523 #define DO_COUNTERS(macro) \
1524 macro(MHN_init_Mem) \
1525 macro(MHN_expand_Mem) \
1526 macro(MHN_resolve_Mem) \
1527 macro(MHN_checkArchivable) \
1528 macro(MHN_getNamedCon) \
1529 macro(MHN_objectFieldOffset) \
1530 macro(MHN_setCallSiteTargetNormal) \
1531 macro(MHN_setCallSiteTargetVolatile) \
1532 macro(MHN_copyOutBootstrapArguments) \
1533 macro(MHN_clearCallSiteContext) \
1534 macro(MHN_staticFieldOffset) \
1535 macro(MHN_staticFieldBase) \
1536 macro(MHN_getMemberVMInfo) \
1537 macro(MH_invoke_UOE) \
1538 macro(MH_invokeExact_UOE) \
1539 macro(JVM_RegisterMethodHandleMethods)
1540
1541 #define INIT_COUNTER(name) \
1542 NEWPERFTICKCOUNTERS(_perf_##name##_timer, SUN_RT, #name); \
1543 NEWPERFEVENTCOUNTER(_perf_##name##_count, SUN_RT, #name "_count"); \
1544
1545 void MethodHandles::init_counters() {
1546 if (UsePerfData) {
1547 EXCEPTION_MARK;
1548
1549 DO_COUNTERS(INIT_COUNTER)
1550
1551 if (HAS_PENDING_EXCEPTION) {
1552 vm_exit_during_initialization("perf_mhn_init failed unexpectedly");
1553 }
1554 }
1555 }
1556
1557 #undef INIT_COUNTER
1558
1559 #define PRINT_COUNTER(name) {\
1560 jlong count = _perf_##name##_count->get_value(); \
1561 if (count > 0) { \
1562 st->print_cr(" %-40s = " JLONG_FORMAT_W(6) "us (elapsed) " JLONG_FORMAT_W(6) "us (thread) (" JLONG_FORMAT_W(5) " events)", #name, \
1563 _perf_##name##_timer->elapsed_counter_value_us(), \
1564 _perf_##name##_timer->thread_counter_value_us(), \
1565 count); \
1566 }}
1567
1568 void MethodHandles::print_counters_on(outputStream* st) {
1569 if (ProfileVMCalls && UsePerfData) {
1570 DO_COUNTERS(PRINT_COUNTER)
1571 } else {
1572 st->print_cr(" MHN: no info (%s is disabled)", (UsePerfData ? "ProfileVMCalls" : "UsePerfData"));
1573 }
1574 }
1575
1576 #undef PRINT_COUNTER