1 /*
2 * Copyright (c) 2008, 2025, 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 "cds/cds_globals.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/systemDictionaryShared.hpp"
31 #include "classfile/vmClasses.hpp"
32 #include "code/codeCache.hpp"
33 #include "code/dependencyContext.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "interpreter/oopMapCache.hpp"
37 #include "interpreter/linkResolver.hpp"
38 #include "jvm_io.h"
39 #include "logging/log.hpp"
40 #include "logging/logStream.hpp"
41 #include "memory/allocation.inline.hpp"
42 #include "memory/oopFactory.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "memory/universe.hpp"
45 #include "oops/klass.inline.hpp"
46 #include "oops/objArrayKlass.hpp"
47 #include "oops/objArrayOop.inline.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "oops/typeArrayOop.inline.hpp"
50 #include "prims/methodHandles.hpp"
51 #include "runtime/deoptimization.hpp"
52 #include "runtime/fieldDescriptor.inline.hpp"
53 #include "runtime/handles.inline.hpp"
54 #include "runtime/interfaceSupport.inline.hpp"
55 #include "runtime/java.hpp"
56 #include "runtime/javaCalls.hpp"
57 #include "runtime/jniHandles.inline.hpp"
58 #include "runtime/perfData.inline.hpp"
59 #include "runtime/timerTrace.hpp"
60 #include "runtime/reflection.hpp"
61 #include "runtime/safepointVerifiers.hpp"
62 #include "runtime/signature.hpp"
63 #include "runtime/stubRoutines.hpp"
64 #include "sanitizers/leak.hpp"
65 #include "services/management.hpp"
66 #include "utilities/exceptions.hpp"
67
68
69 /*
70 * JSR 292 reference implementation: method handles
71 * The JDK 7 reference implementation represented method handle
72 * combinations as chains. Each link in the chain had a "vmentry"
73 * field which pointed at a bit of assembly code which performed
74 * one transformation before dispatching to the next link in the chain.
75 *
76 * The current reference implementation pushes almost all code generation
77 * responsibility to (trusted) Java code. A method handle contains a
78 * pointer to its "LambdaForm", which embodies all details of the method
79 * handle's behavior. The LambdaForm is a normal Java object, managed
80 * by a runtime coded in Java.
81 */
82
83 bool MethodHandles::_enabled = false; // set true after successful native linkage
84 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = nullptr;
85
86 /**
87 * Generates method handle adapters. Returns 'false' if memory allocation
88 * failed and true otherwise.
89 */
90 void MethodHandles::generate_adapters() {
91 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
92 assert(_adapter_code == nullptr, "generate only once");
93
94 ResourceMark rm;
95 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
96 // The adapter entry is required to be aligned to CodeEntryAlignment.
97 // So we need additional bytes due to alignment.
98 int adapter_num = (int)Interpreter::method_handle_invoke_LAST - (int)Interpreter::method_handle_invoke_FIRST + 1;
99 int max_aligned_bytes = adapter_num * CodeEntryAlignment;
100 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size + max_aligned_bytes);
101 CodeBuffer code(_adapter_code);
102 MethodHandlesAdapterGenerator g(&code);
103 g.generate();
104 code.log_section_sizes("MethodHandlesAdapterBlob");
105 }
106
107 //------------------------------------------------------------------------------
108 // MethodHandlesAdapterGenerator::generate
109 //
110 void MethodHandlesAdapterGenerator::generate() {
111 // Generate generic method handle adapters.
112 // Generate interpreter entries
113 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
114 mk <= Interpreter::method_handle_invoke_LAST;
115 mk = Interpreter::MethodKind(1 + (int)mk)) {
116 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
117 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
118 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
119 if (entry != nullptr) {
120 Interpreter::set_entry_for_kind(mk, entry);
121 }
122 // If the entry is not set, it will throw AbstractMethodError.
123 }
124 }
125
126 void MethodHandles::set_enabled(bool z) {
127 if (_enabled != z) {
128 guarantee(z, "can only enable once");
129 _enabled = z;
130 }
131 }
132
133 // MemberName support
134
135 // import java_lang_invoke_MemberName.*
136 enum {
137 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
138 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
139 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
140 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
141 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
142 TRUSTED_FINAL = java_lang_invoke_MemberName::MN_TRUSTED_FINAL,
143 HIDDEN_MEMBER = java_lang_invoke_MemberName::MN_HIDDEN_MEMBER,
144 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
145 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
146 LM_UNCONDITIONAL = java_lang_invoke_MemberName::MN_UNCONDITIONAL_MODE,
147 LM_MODULE = java_lang_invoke_MemberName::MN_MODULE_MODE,
148 LM_TRUSTED = java_lang_invoke_MemberName::MN_TRUSTED_MODE,
149 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
150 };
151
152 int MethodHandles::ref_kind_to_flags(int ref_kind) {
153 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
154 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
155 if (ref_kind_is_field(ref_kind)) {
156 flags |= IS_FIELD;
157 } else if (ref_kind_is_method(ref_kind)) {
158 flags |= IS_METHOD;
159 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
160 flags |= IS_CONSTRUCTOR;
161 }
162 return flags;
163 }
164
165 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
166 Handle empty;
167 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
168 if (!java_lang_String::is_instance(type())) {
169 return type; // already resolved
170 }
171 Symbol* signature = java_lang_String::as_symbol_or_null(type());
172 if (signature == nullptr) {
173 return empty; // no such signature exists in the VM
174 }
175 Handle resolved;
176 int flags = java_lang_invoke_MemberName::flags(mname());
177 switch (flags & ALL_KINDS) {
178 case IS_METHOD:
179 case IS_CONSTRUCTOR:
180 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
181 break;
182 case IS_FIELD:
183 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
184 break;
185 default:
186 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
187 }
188 if (resolved.is_null()) {
189 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
190 }
191 return resolved;
192 }
193
194 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
195 // This method is used from java.lang.invoke.MemberName constructors.
196 // It fills in the new MemberName from a java.lang.reflect.Member.
197 oop target_oop = target();
198 Klass* target_klass = target_oop->klass();
199 if (target_klass == vmClasses::reflect_Field_klass()) {
200 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
201 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
202 Klass* k = java_lang_Class::as_Klass(clazz);
203 if (k != nullptr && k->is_instance_klass()) {
204 fieldDescriptor fd(InstanceKlass::cast(k), slot);
205 oop mname2 = init_field_MemberName(mname, fd);
206 if (mname2 != nullptr) {
207 // Since we have the reified name and type handy, add them to the result.
208 if (java_lang_invoke_MemberName::name(mname2) == nullptr)
209 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
210 if (java_lang_invoke_MemberName::type(mname2) == nullptr)
211 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
212 }
213 return mname2;
214 }
215 } else if (target_klass == vmClasses::reflect_Method_klass()) {
216 oop clazz = java_lang_reflect_Method::clazz(target_oop);
217 int slot = java_lang_reflect_Method::slot(target_oop);
218 Klass* k = java_lang_Class::as_Klass(clazz);
219 if (k != nullptr && k->is_instance_klass()) {
220 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
221 if (m == nullptr || is_signature_polymorphic(m->intrinsic_id()))
222 return nullptr; // do not resolve unless there is a concrete signature
223 CallInfo info(m, k, CHECK_NULL);
224 return init_method_MemberName(mname, info);
225 }
226 } else if (target_klass == vmClasses::reflect_Constructor_klass()) {
227 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
228 int slot = java_lang_reflect_Constructor::slot(target_oop);
229 Klass* k = java_lang_Class::as_Klass(clazz);
230 if (k != nullptr && k->is_instance_klass()) {
231 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
232 if (m == nullptr) return nullptr;
233 CallInfo info(m, k, CHECK_NULL);
234 return init_method_MemberName(mname, info);
235 }
236 }
237 return nullptr;
238 }
239
240 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
241 assert(info.resolved_appendix().is_null(), "only normal methods here");
242 methodHandle m(Thread::current(), info.resolved_method());
243 assert(m.not_null(), "null method handle");
244 InstanceKlass* m_klass = m->method_holder();
245 assert(m_klass != nullptr, "null holder for method handle");
246 int flags = (m->access_flags().as_method_flags());
247 int vmindex = Method::invalid_vtable_index;
248 LogTarget(Debug, methodhandles, indy) lt_indy;
249
250 switch (info.call_kind()) {
251 case CallInfo::itable_call:
252 vmindex = info.itable_index();
253 // More importantly, the itable index only works with the method holder.
254 assert(m_klass->verify_itable_index(vmindex), "");
255 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
256 if (lt_indy.is_enabled()) {
257 ResourceMark rm;
258 LogStream ls(lt_indy);
259 ls.print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
260 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
261 vmindex);
262 m->access_flags().print_on(&ls);
263 if (!m->is_abstract()) {
264 if (!m->is_private()) {
265 ls.print("default");
266 }
267 else {
268 ls.print("private-intf");
269 }
270 }
271 ls.cr();
272 }
273 break;
274
275 case CallInfo::vtable_call:
276 vmindex = info.vtable_index();
277 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
278 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
279 if (m_klass->is_interface()) {
280 // This is a vtable call to an interface method (abstract "miranda method" or default method).
281 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
282 // (LinkResolver should help us figure this out.)
283 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass");
284 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass());
285 if (m_klass_non_interface->is_interface()) {
286 m_klass_non_interface = vmClasses::Object_klass();
287 #ifdef ASSERT
288 { ResourceMark rm;
289 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
290 assert(m->name() == m2->name() && m->signature() == m2->signature(),
291 "at %d, %s != %s", vmindex,
292 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
293 }
294 #endif //ASSERT
295 }
296 if (!m->is_public()) {
297 assert(m->is_public(), "virtual call must be to public interface method");
298 return nullptr; // elicit an error later in product build
299 }
300 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
301 m_klass = m_klass_non_interface;
302 }
303 if (lt_indy.is_enabled()) {
304 ResourceMark rm;
305 LogStream ls(lt_indy);
306 ls.print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
307 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
308 m_klass->internal_name(), vmindex);
309 m->access_flags().print_on(&ls);
310 if (m->is_default_method()) {
311 ls.print("default");
312 }
313 ls.cr();
314 }
315 break;
316
317 case CallInfo::direct_call:
318 vmindex = Method::nonvirtual_vtable_index;
319 if (m->is_static()) {
320 assert(!m->is_static_initializer(), "Cannot be static initializer");
321 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
322 } else if (m->is_object_initializer()) {
323 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
324 } else {
325 // "special" reflects that this is a direct call, not that it
326 // necessarily originates from an invokespecial. We can also do
327 // direct calls for private and/or final non-static methods.
328 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
329 }
330 break;
331
332 default: assert(false, "bad CallInfo"); return nullptr;
333 }
334
335 // @CallerSensitive annotation detected
336 if (m->caller_sensitive()) {
337 flags |= CALLER_SENSITIVE;
338 }
339
340 Handle resolved_method = info.resolved_method_name();
341 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(),
342 "Should not change after link resolution");
343
344 oop mname_oop = mname();
345 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
346 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
347 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
348 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
349 // Note: name and type can be lazily computed by resolve_MemberName,
350 // if Java code needs them as resolved String and MethodType objects.
351 // If relevant, the vtable or itable value is stored as vmindex.
352 // This is done eagerly, since it is readily available without
353 // constructing any new objects.
354 return mname();
355 }
356
357 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
358 InstanceKlass* ik = fd.field_holder();
359 int flags = fd.access_flags().as_field_flags();
360 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
361 if (fd.is_trusted_final()) flags |= TRUSTED_FINAL;
362 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
363 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
364
365 oop mname_oop = mname();
366 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
367 java_lang_invoke_MemberName::set_method (mname_oop, nullptr);
368 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
369 java_lang_invoke_MemberName::set_clazz (mname_oop, ik->java_mirror());
370
371 oop type = field_signature_type_or_null(fd.signature());
372 oop name = field_name_or_null(fd.name());
373 if (name != nullptr)
374 java_lang_invoke_MemberName::set_name(mname_oop, name);
375 if (type != nullptr)
376 java_lang_invoke_MemberName::set_type(mname_oop, type);
377 // Note: name and type can be lazily computed by resolve_MemberName,
378 // if Java code needs them as resolved String and Class objects.
379 // Note that the incoming type oop might be pre-resolved (non-null).
380 // The base clazz and field offset (vmindex) must be eagerly stored,
381 // because they unambiguously identify the field.
382 // Although the fieldDescriptor::_index would also identify the field,
383 // we do not use it, because it is harder to decode.
384 // TO DO: maybe intern mname_oop
385 return mname();
386 }
387
388 // JVM 2.9 Special Methods:
389 // A method is signature polymorphic if and only if all of the following conditions hold :
390 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
391 // * It has a single formal parameter of type Object[].
392 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
393 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
394 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
395 if (klass == nullptr)
396 return false;
397 // The following test will fail spuriously during bootstrap of MethodHandle itself:
398 // if (klass != vmClasses::MethodHandle_klass())
399 // Test the name instead:
400 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
401 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
402 return false;
403 }
404
405 // Look up signature polymorphic method with polymorphic return type
406 Symbol* poly_sig = vmSymbols::object_array_object_signature();
407 InstanceKlass* iklass = InstanceKlass::cast(klass);
408 Method* m = iklass->find_method(name, poly_sig);
409 if (m != nullptr) {
410 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
411 int flags = m->access_flags().as_method_flags();
412 if ((flags & required) == required) {
413 return true;
414 }
415 }
416
417 // Look up signature polymorphic method with non-polymorphic (non Object) return type
418 int me;
419 int ms = iklass->find_method_by_name(name, &me);
420 if (ms == -1) return false;
421 for (; ms < me; ms++) {
422 Method* m = iklass->methods()->at(ms);
423 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
424 int flags = m->access_flags().as_method_flags();
425 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
426 return true;
427 }
428 }
429 return false;
430 }
431
432
433 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
434 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
435 switch (iid) {
436 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
437 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
438 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
439 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
440 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
441 case vmIntrinsics::_linkToNative: return vmSymbols::linkToNative_name();
442 default:
443 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
444 }
445 }
446
447 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
448 switch(id) {
449 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
450 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
451 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
452 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
453 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
454 default:
455 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
456 }
457 }
458
459 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
460 switch (iid) {
461 case vmIntrinsics::_invokeBasic: return 0;
462 case vmIntrinsics::_linkToNative: return 0;
463 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
464 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
465 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
466 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
467 default:
468 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
469 }
470 }
471
472 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
473 vmSymbolID name_id = vmSymbols::find_sid(name);
474 switch (name_id) {
475 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
476 case VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
477 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
478 case VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
479
480 // There is one static signature-polymorphic method for each JVM invocation mode.
481 case VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
482 case VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
483 case VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
484 case VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
485 case VM_SYMBOL_ENUM_NAME(linkToNative_name): return vmIntrinsics::_linkToNative;
486 default: break;
487 }
488
489 // Cover the case of invokeExact and any future variants of invokeFoo.
490 Klass* mh_klass = vmClasses::klass_at(VM_CLASS_ID(MethodHandle_klass));
491 if (mh_klass != nullptr && is_method_handle_invoke_name(mh_klass, name)) {
492 return vmIntrinsics::_invokeGeneric;
493 }
494
495 // Cover the case of methods on VarHandle.
496 Klass* vh_klass = vmClasses::klass_at(VM_CLASS_ID(VarHandle_klass));
497 if (vh_klass != nullptr && is_method_handle_invoke_name(vh_klass, name)) {
498 return vmIntrinsics::_invokeGeneric;
499 }
500
501 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
502 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
503 return vmIntrinsics::_none;
504 }
505
506 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
507 if (klass != nullptr &&
508 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
509 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
510 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
511 if (iid != vmIntrinsics::_none)
512 return iid;
513 if (is_method_handle_invoke_name(klass, name))
514 return vmIntrinsics::_invokeGeneric;
515 }
516 return vmIntrinsics::_none;
517 }
518
519 // Returns true if method is signature polymorphic and public
520 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
521 if (is_signature_polymorphic_name(klass, name)) {
522 InstanceKlass* iklass = InstanceKlass::cast(klass);
523 int me;
524 int ms = iklass->find_method_by_name(name, &me);
525 assert(ms != -1, "");
526 for (; ms < me; ms++) {
527 Method* m = iklass->methods()->at(ms);
528 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
529 int flags = m->access_flags().as_method_flags();
530 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
531 return true;
532 }
533 }
534 }
535 return false;
536 }
537
538 // convert the external string or reflective type to an internal signature
539 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
540 if (java_lang_invoke_MethodType::is_instance(type_str)) {
541 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
542 } else if (java_lang_Class::is_instance(type_str)) {
543 return java_lang_Class::as_signature(type_str, false);
544 } else if (java_lang_String::is_instance(type_str)) {
545 if (intern_if_not_found) {
546 return java_lang_String::as_symbol(type_str);
547 } else {
548 return java_lang_String::as_symbol_or_null(type_str);
549 }
550 } else {
551 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", nullptr);
552 }
553 }
554
555 static const char OBJ_SIG[] = "Ljava/lang/Object;";
556 enum { OBJ_SIG_LEN = 18 };
557
558 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
559 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
560 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
561 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) {
562 switch (ss.type()) {
563 case T_OBJECT:
564 // only java/lang/Object is valid here
565 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, OBJ_SIG_LEN) != 0)
566 return false;
567 break;
568 case T_VOID:
569 case T_INT:
570 case T_LONG:
571 case T_FLOAT:
572 case T_DOUBLE:
573 break;
574 default:
575 // subword types (T_BYTE etc.), Q-descriptors, arrays
576 return false;
577 }
578 }
579 return true;
580 }
581
582 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg) {
583 Symbol* bsig = nullptr;
584 if (sig == nullptr) {
585 return sig;
586 } else if (is_basic_type_signature(sig)) {
587 sig->increment_refcount();
588 return sig; // that was easy
589 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) {
590 BasicType bt = Signature::basic_type(sig);
591 if (is_subword_type(bt)) {
592 bsig = vmSymbols::int_signature();
593 } else {
594 assert(is_reference_type(bt), "is_basic_type_signature was false");
595 bsig = vmSymbols::object_signature();
596 }
597 } else {
598 ResourceMark rm;
599 stringStream buffer(128);
600 buffer.put(JVM_SIGNATURE_FUNC);
601 int arg_pos = 0, keep_arg_pos = -1;
602 if (keep_last_arg)
603 keep_arg_pos = ArgumentCount(sig).size() - 1;
604 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
605 BasicType bt = ss.type();
606 size_t this_arg_pos = buffer.size();
607 if (ss.at_return_type()) {
608 buffer.put(JVM_SIGNATURE_ENDFUNC);
609 }
610 if (arg_pos == keep_arg_pos) {
611 buffer.write((char*) ss.raw_bytes(),
612 (int) ss.raw_length());
613 } else if (is_reference_type(bt)) {
614 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
615 } else {
616 if (is_subword_type(bt))
617 bt = T_INT;
618 buffer.put(type2char(bt));
619 }
620 arg_pos++;
621 }
622 const char* sigstr = buffer.base();
623 int siglen = (int) buffer.size();
624 bsig = SymbolTable::new_symbol(sigstr, siglen);
625 }
626 assert(is_basic_type_signature(bsig) ||
627 // detune assert in case the injected argument is not a basic type:
628 keep_last_arg, "");
629 return bsig;
630 }
631
632 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
633 Symbol* sig) {
634 st = st ? st : tty;
635 bool prev_type = false;
636 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC);
637 if (is_method) st->put(JVM_SIGNATURE_FUNC);
638 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
639 if (ss.at_return_type())
640 st->put(JVM_SIGNATURE_ENDFUNC);
641 else if (prev_type)
642 st->put(',');
643 const char* cp = (const char*) ss.raw_bytes();
644 if (ss.is_array()) {
645 st->put(JVM_SIGNATURE_ARRAY);
646 if (ss.array_prefix_length() == 1)
647 st->put(cp[1]);
648 else
649 st->put(JVM_SIGNATURE_CLASS);
650 } else {
651 st->put(cp[0]);
652 }
653 }
654 }
655
656
657
658 static oop object_java_mirror() {
659 return vmClasses::Object_klass()->java_mirror();
660 }
661
662 oop MethodHandles::field_name_or_null(Symbol* s) {
663 if (s == nullptr) return nullptr;
664 return StringTable::lookup(s);
665 }
666
667 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
668 if (s == nullptr) return nullptr;
669 BasicType bt = Signature::basic_type(s);
670 if (is_java_primitive(bt)) {
671 assert(s->utf8_length() == 1, "");
672 return java_lang_Class::primitive_mirror(bt);
673 }
674 // Here are some more short cuts for common types.
675 // They are optional, since reference types can be resolved lazily.
676 if (bt == T_OBJECT) {
677 if (s == vmSymbols::object_signature()) {
678 return object_java_mirror();
679 } else if (s == vmSymbols::class_signature()) {
680 return vmClasses::Class_klass()->java_mirror();
681 } else if (s == vmSymbols::string_signature()) {
682 return vmClasses::String_klass()->java_mirror();
683 }
684 }
685 return nullptr;
686 }
687
688 // An unresolved member name is a mere symbolic reference.
689 // Resolving it plants a vmtarget/vmindex in it,
690 // which refers directly to JVM internals.
691 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, int lookup_mode,
692 bool speculative_resolve, TRAPS) {
693 Handle empty;
694 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
695
696 if (java_lang_invoke_MemberName::vmtarget(mname()) != nullptr) {
697 // Already resolved.
698 DEBUG_ONLY(intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()));
699 assert(vmindex >= Method::nonvirtual_vtable_index, "");
700 return mname;
701 }
702
703 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
704 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
705 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
706 int flags = java_lang_invoke_MemberName::flags(mname());
707 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
708 if (!ref_kind_is_valid(ref_kind)) {
709 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
710 }
711
712 DEBUG_ONLY(intptr_t old_vmindex);
713 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
714
715 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
716 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
717 }
718
719 InstanceKlass* defc = nullptr;
720 {
721 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
722 if (defc_klass == nullptr) return empty; // a primitive; no resolution possible
723 if (!defc_klass->is_instance_klass()) {
724 if (!defc_klass->is_array_klass()) return empty;
725 defc_klass = vmClasses::Object_klass();
726 }
727 defc = InstanceKlass::cast(defc_klass);
728 }
729 if (defc == nullptr) {
730 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
731 }
732 defc->link_class(CHECK_(empty)); // possible safepoint
733
734 // convert the external string name to an internal symbol
735 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
736 if (name == nullptr) return empty; // no such name
737 if (name == vmSymbols::class_initializer_name())
738 return empty; // illegal name
739
740 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
741 if ((flags & ALL_KINDS) == IS_METHOD &&
742 (defc == vmClasses::MethodHandle_klass() || defc == vmClasses::VarHandle_klass()) &&
743 (ref_kind == JVM_REF_invokeVirtual ||
744 ref_kind == JVM_REF_invokeSpecial ||
745 // static invocation mode is required for _linkToVirtual, etc.:
746 ref_kind == JVM_REF_invokeStatic)) {
747 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
748 if (iid != vmIntrinsics::_none &&
749 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
750 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
751 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
752 mh_invoke_id = iid;
753 }
754 }
755
756 // convert the external string or reflective type to an internal signature
757 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
758 if (type == nullptr) return empty; // no such signature exists in the VM
759
760 // skip access check if it's trusted lookup
761 LinkInfo::AccessCheck access_check = caller != nullptr ?
762 LinkInfo::AccessCheck::required :
763 LinkInfo::AccessCheck::skip;
764 // skip loader constraints if it's trusted lookup or a public lookup
765 LinkInfo::LoaderConstraintCheck loader_constraint_check = (caller != nullptr && (lookup_mode & LM_UNCONDITIONAL) == 0) ?
766 LinkInfo::LoaderConstraintCheck::required :
767 LinkInfo::LoaderConstraintCheck::skip;
768
769 // Time to do the lookup.
770 switch (flags & ALL_KINDS) {
771 case IS_METHOD:
772 {
773 CallInfo result;
774 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
775 {
776 assert(!HAS_PENDING_EXCEPTION, "");
777 if (ref_kind == JVM_REF_invokeStatic) {
778 LinkResolver::resolve_static_call(result,
779 link_info, false, THREAD);
780 } else if (ref_kind == JVM_REF_invokeInterface) {
781 LinkResolver::resolve_interface_call(result, Handle(), defc,
782 link_info, false, THREAD);
783 } else if (mh_invoke_id != vmIntrinsics::_none) {
784 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
785 LinkResolver::resolve_handle_call(result, link_info, THREAD);
786 } else if (ref_kind == JVM_REF_invokeSpecial) {
787 LinkResolver::resolve_special_call(result, Handle(),
788 link_info, THREAD);
789 } else if (ref_kind == JVM_REF_invokeVirtual) {
790 LinkResolver::resolve_virtual_call(result, Handle(), defc,
791 link_info, false, THREAD);
792 } else {
793 assert(false, "ref_kind=%d", ref_kind);
794 }
795 if (HAS_PENDING_EXCEPTION) {
796 if (speculative_resolve) {
797 CLEAR_PENDING_EXCEPTION;
798 }
799 return empty;
800 }
801 }
802 if (result.resolved_appendix().not_null()) {
803 // The resolved MemberName must not be accompanied by an appendix argument,
804 // since there is no way to bind this value into the MemberName.
805 // Caller is responsible to prevent this from happening.
806 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
807 }
808 result.set_resolved_method_name(CHECK_(empty));
809 oop mname2 = init_method_MemberName(mname, result);
810 return Handle(THREAD, mname2);
811 }
812 case IS_CONSTRUCTOR:
813 {
814 CallInfo result;
815 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
816 {
817 assert(!HAS_PENDING_EXCEPTION, "");
818 if (name == vmSymbols::object_initializer_name()) {
819 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
820 } else {
821 break; // will throw after end of switch
822 }
823 if (HAS_PENDING_EXCEPTION) {
824 if (speculative_resolve) {
825 CLEAR_PENDING_EXCEPTION;
826 }
827 return empty;
828 }
829 }
830 assert(result.is_statically_bound(), "");
831 result.set_resolved_method_name(CHECK_(empty));
832 oop mname2 = init_method_MemberName(mname, result);
833 return Handle(THREAD, mname2);
834 }
835 case IS_FIELD:
836 {
837 fieldDescriptor result; // find_field initializes fd if found
838 {
839 assert(!HAS_PENDING_EXCEPTION, "");
840 LinkInfo link_info(defc, name, type, caller, LinkInfo::AccessCheck::skip, loader_constraint_check);
841 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
842 if (HAS_PENDING_EXCEPTION) {
843 if (speculative_resolve) {
844 CLEAR_PENDING_EXCEPTION;
845 }
846 return empty;
847 }
848 }
849 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
850 return Handle(THREAD, mname2);
851 }
852 default:
853 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
854 }
855
856 return empty;
857 }
858
859 // Conversely, a member name which is only initialized from JVM internals
860 // may have null defc, name, and type fields.
861 // Resolving it plants a vmtarget/vmindex in it,
862 // which refers directly to JVM internals.
863 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
864 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
865
866 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != nullptr);
867 bool have_name = (java_lang_invoke_MemberName::name(mname()) != nullptr);
868 bool have_type = (java_lang_invoke_MemberName::type(mname()) != nullptr);
869 int flags = java_lang_invoke_MemberName::flags(mname());
870
871 if (suppress != 0) {
872 if (suppress & _suppress_defc) have_defc = true;
873 if (suppress & _suppress_name) have_name = true;
874 if (suppress & _suppress_type) have_type = true;
875 }
876
877 if (have_defc && have_name && have_type) return; // nothing needed
878
879 switch (flags & ALL_KINDS) {
880 case IS_METHOD:
881 case IS_CONSTRUCTOR:
882 {
883 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
884 if (vmtarget == nullptr) {
885 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
886 }
887 methodHandle m(THREAD, vmtarget);
888 DEBUG_ONLY(vmtarget = nullptr); // safety
889 if (!have_defc) {
890 InstanceKlass* defc = m->method_holder();
891 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
892 }
893 if (!have_name) {
894 //not java_lang_String::create_from_symbol; let's intern member names
895 oop name = StringTable::intern(m->name(), CHECK);
896 java_lang_invoke_MemberName::set_name(mname(), name);
897 }
898 if (!have_type) {
899 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
900 java_lang_invoke_MemberName::set_type(mname(), type());
901 }
902 return;
903 }
904 case IS_FIELD:
905 {
906 oop clazz = java_lang_invoke_MemberName::clazz(mname());
907 if (clazz == nullptr) {
908 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
909 }
910 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
911 DEBUG_ONLY(clazz = nullptr); // safety
912 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
913 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
914 fieldDescriptor fd; // find_field initializes fd if found
915 if (!defc->find_field_from_offset(checked_cast<int>(vmindex), is_static, &fd))
916 break; // cannot expand
917 if (!have_name) {
918 //not java_lang_String::create_from_symbol; let's intern member names
919 oop name = StringTable::intern(fd.name(), CHECK);
920 java_lang_invoke_MemberName::set_name(mname(), name);
921 }
922 if (!have_type) {
923 // If it is a primitive field type, don't mess with short strings like "I".
924 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
925 if (type.is_null()) {
926 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
927 }
928 java_lang_invoke_MemberName::set_type(mname(), type());
929 }
930 return;
931 }
932 }
933 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
934 }
935
936 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
937 assert_locked_or_safepoint(CodeCache_lock);
938
939 DependencyContext deps = java_lang_invoke_CallSite::vmdependencies(call_site);
940 deps.add_dependent_nmethod(nm);
941 }
942
943 void MethodHandles::clean_dependency_context(oop call_site) {
944 DependencyContext deps = java_lang_invoke_CallSite::vmdependencies(call_site);
945 deps.clean_unloading_dependents();
946 }
947
948 void MethodHandles::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, Handle call_site, Handle target) {
949 assert_lock_strong(Compile_lock);
950
951 CallSiteDepChange changes(call_site, target);
952 {
953 NoSafepointVerifier nsv;
954 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
955
956 DependencyContext deps = java_lang_invoke_CallSite::vmdependencies(call_site());
957 deps.mark_dependent_nmethods(deopt_scope, changes);
958 }
959 }
960
961 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
962 if (log_is_enabled(Info, methodhandles)) {
963 const char* name = vmIntrinsics::name_at(iid);
964 if (*name == '_') name += 1;
965 const size_t len = strlen(name) + 50;
966 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
967 const char* suffix = "";
968 if (is_signature_polymorphic(iid)) {
969 if (is_signature_polymorphic_static(iid))
970 suffix = "/static";
971 else
972 suffix = "/private";
973 }
974 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
975 trace_method_handle(_masm, qname);
976 // LSan appears unable to keep track of qname, ignore it.
977 LSAN_IGNORE_OBJECT(qname);
978 // Note: Don't free the allocated char array because it's used
979 // during runtime.
980 }
981 }
982
983 //
984 // Here are the native methods in java.lang.invoke.MethodHandleNatives
985 // They are the private interface between this JVM and the HotSpot-specific
986 // Java code that implements JSR 292 method handles.
987 //
988 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
989 // that intrinsic (non-JNI) native methods are defined in HotSpot.
990 //
991
992 #ifndef PRODUCT
993 #define EACH_NAMED_CON(template, requirement) \
994 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
995 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
996 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
997 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
998 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
999 template(java_lang_invoke_MemberName,MN_TRUSTED_FINAL) \
1000 template(java_lang_invoke_MemberName,MN_HIDDEN_MEMBER) \
1001 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1002 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1003 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \
1004 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \
1005 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \
1006 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \
1007 template(java_lang_invoke_MemberName,MN_MODULE_MODE) \
1008 template(java_lang_invoke_MemberName,MN_UNCONDITIONAL_MODE) \
1009 template(java_lang_invoke_MemberName,MN_TRUSTED_MODE) \
1010 /*end*/
1011
1012 #define IGNORE_REQ(req_expr) /* req_expr */
1013 #define ONE_PLUS(scope,value) 1+
1014 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1015 #define VALUE_COMMA(scope,value) scope::value,
1016 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1017 #define STRING_NULL(scope,value) #value "\0"
1018 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1019
1020 static bool advertise_con_value(int which) {
1021 if (which < 0) return false;
1022 bool ok = true;
1023 int count = 0;
1024 #define INC_COUNT(scope,value) \
1025 ++count;
1026 #define CHECK_REQ(req_expr) \
1027 if (which < count) return ok; \
1028 ok = (req_expr);
1029 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1030 #undef INC_COUNT
1031 #undef CHECK_REQ
1032 assert(count == con_value_count, "");
1033 if (which < count) return ok;
1034 return false;
1035 }
1036
1037 #undef ONE_PLUS
1038 #undef VALUE_COMMA
1039 #undef STRING_NULL
1040 #undef EACH_NAMED_CON
1041 #endif // PRODUCT
1042
1043 JVM_ENTRY_PROF(jint, MHN_getNamedCon, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1044 #ifndef PRODUCT
1045 if (advertise_con_value(which)) {
1046 assert(which >= 0 && which < con_value_count, "");
1047 int con = con_values[which];
1048 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1049 if (box.not_null() && box->klass() == Universe::objectArrayKlass() && box->length() > 0) {
1050 const char* str = &con_names[0];
1051 for (int i = 0; i < which; i++)
1052 str += strlen(str) + 1; // skip name and null
1053 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1054 box->obj_at_put(0, name);
1055 }
1056 return con;
1057 }
1058 #endif
1059 return 0;
1060 }
1061 JVM_END
1062
1063 // void init(MemberName self, AccessibleObject ref)
1064 JVM_ENTRY_PROF(void, MHN_init_Mem, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1065 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1066 if (target_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1067 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1068 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1069 MethodHandles::init_MemberName(mname, target, CHECK);
1070 }
1071 JVM_END
1072
1073 // void expand(MemberName self)
1074 JVM_ENTRY_PROF(void, MHN_expand_Mem, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1075 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1076 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1077 MethodHandles::expand_MemberName(mname, 0, CHECK);
1078 }
1079 JVM_END
1080
1081 // void resolve(MemberName self, Class<?> caller)
1082 JVM_ENTRY_PROF(jobject, MHN_resolve_Mem, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1083 jint lookup_mode, jboolean speculative_resolve)) {
1084 if (mname_jh == nullptr) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1085 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1086
1087 // The trusted Java code that calls this method should already have performed
1088 // access checks on behalf of the given caller. But, we can verify this.
1089 // This only verifies from the context of the lookup class. It does not
1090 // verify the lookup context for a Lookup object teleported from one module
1091 // to another. Such Lookup object can only access the intersection of the set
1092 // of accessible classes from both lookup class and previous lookup class.
1093 if (VerifyMethodHandles && (lookup_mode & LM_TRUSTED) == LM_TRUSTED && caller_jh != nullptr &&
1094 java_lang_invoke_MemberName::clazz(mname()) != nullptr) {
1095 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1096 if (reference_klass != nullptr && reference_klass->is_objArray_klass()) {
1097 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1098 }
1099
1100 // Reflection::verify_class_access can only handle instance classes.
1101 if (reference_klass != nullptr && reference_klass->is_instance_klass()) {
1102 // Emulate LinkResolver::check_klass_accessability.
1103 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1104 // access check on behalf of the caller if this is not a public lookup
1105 // i.e. lookup mode is not UNCONDITIONAL
1106 if ((lookup_mode & LM_UNCONDITIONAL) == 0
1107 && Reflection::verify_class_access(caller,
1108 InstanceKlass::cast(reference_klass),
1109 true) != Reflection::ACCESS_OK) {
1110 ResourceMark rm(THREAD);
1111 stringStream ss;
1112 ss.print("caller %s tried to access %s", caller->class_in_module_of_loader(),
1113 reference_klass->class_in_module_of_loader());
1114 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), ss.as_string());
1115 }
1116 }
1117 }
1118
1119 Klass* caller = caller_jh == nullptr ? nullptr :
1120 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1121 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, lookup_mode,
1122 speculative_resolve == JNI_TRUE,
1123 CHECK_NULL);
1124
1125 if (resolved.is_null()) {
1126 int flags = java_lang_invoke_MemberName::flags(mname());
1127 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1128 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1129 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1130 }
1131 if (speculative_resolve) {
1132 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1133 return nullptr;
1134 }
1135 if ((flags & ALL_KINDS) == IS_FIELD) {
1136 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1137 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1138 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1139 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1140 } else {
1141 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1142 }
1143 }
1144
1145 return JNIHandles::make_local(THREAD, resolved());
1146 }
1147 JVM_END
1148
1149 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1150 if (mname == nullptr ||
1151 java_lang_invoke_MemberName::clazz(mname) == nullptr) {
1152 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1153 } else {
1154 int flags = java_lang_invoke_MemberName::flags(mname);
1155 if ((flags & IS_FIELD) != 0 &&
1156 (must_be_static
1157 ? (flags & JVM_ACC_STATIC) != 0
1158 : (flags & JVM_ACC_STATIC) == 0)) {
1159 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname);
1160 return (jlong) vmindex;
1161 }
1162 }
1163 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1164 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1165 return 0;
1166 }
1167
1168 JVM_ENTRY_PROF(jlong, MHN_objectFieldOffset, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1169 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1170 }
1171 JVM_END
1172
1173 JVM_ENTRY_PROF(jlong, MHN_staticFieldOffset, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1174 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1175 }
1176 JVM_END
1177
1178 JVM_ENTRY_PROF(jobject, MHN_staticFieldBase, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1179 // use the other function to perform sanity checks:
1180 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1181 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1182 return JNIHandles::make_local(THREAD, clazz);
1183 }
1184 JVM_END
1185
1186 JVM_ENTRY_PROF(jobject, MHN_getMemberVMInfo, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1187 if (mname_jh == nullptr) return nullptr;
1188 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1189 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1190 objArrayHandle result = oopFactory::new_objArray_handle(vmClasses::Object_klass(), 2, CHECK_NULL);
1191 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1192 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1193 result->obj_at_put(0, x);
1194
1195 int flags = java_lang_invoke_MemberName::flags(mname());
1196 if ((flags & IS_FIELD) != 0) {
1197 x = java_lang_invoke_MemberName::clazz(mname());
1198 } else {
1199 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1200 assert(vmtarget != nullptr && vmtarget->is_method(), "vmtarget is only method");
1201 x = mname();
1202 }
1203 result->obj_at_put(1, x);
1204 return JNIHandles::make_local(THREAD, result());
1205 }
1206 JVM_END
1207
1208 JVM_ENTRY_PROF(void, MHN_setCallSiteTargetNormal, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1209 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1210 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1211 DeoptimizationScope deopt_scope;
1212 {
1213 // Walk all nmethods depending on this call site.
1214 MutexLocker mu(thread, Compile_lock);
1215 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1216 java_lang_invoke_CallSite::set_target(call_site(), target());
1217 // This is assumed to be an 'atomic' operation by verification.
1218 // So keep it under lock for now.
1219 deopt_scope.deoptimize_marked();
1220 }
1221 }
1222 JVM_END
1223
1224 // Make sure the class is linked. If the class cannot be verified, etc, an exception will be thrown.
1225 JVM_ENTRY_PROF(void, MHN_checkArchivable, MHN_checkArchivable(JNIEnv *env, jobject igcls, jclass klass_jh)) {
1226 if (klass_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "klass is null"); }
1227
1228 if (CDSConfig::is_dumping_invokedynamic()) {
1229 Klass* klass = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(klass_jh));
1230 if (klass != nullptr && klass->is_instance_klass()) {
1231 // klass could be null during very early VM start-up
1232 InstanceKlass* ik = InstanceKlass::cast(klass);
1233 ik->link_class(THREAD); // exception will be thrown if unverifiable
1234 if (!ik->is_linked()) {
1235 assert(HAS_PENDING_EXCEPTION, "must be");
1236 ResourceMark rm;
1237 log_warning(cds)("Cannot use unverifiable class %s in MethodType",
1238 klass->external_name());
1239 return;
1240 }
1241
1242 if (SystemDictionaryShared::is_jfr_event_class(ik)) {
1243 ResourceMark rm;
1244 log_warning(cds)("Cannot use JFR event class %s in MethodType",
1245 klass->external_name());
1246 Exceptions::fthrow(THREAD_AND_LOCATION,
1247 vmSymbols::java_lang_NoClassDefFoundError(),
1248 "Class %s, or one of its supertypes, is a JFR event class",
1249 klass->external_name());
1250 }
1251 }
1252 }
1253 }
1254 JVM_END
1255
1256 JVM_ENTRY_PROF(void, MHN_setCallSiteTargetVolatile, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1257 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1258 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1259 DeoptimizationScope deopt_scope;
1260 {
1261 // Walk all nmethods depending on this call site.
1262 MutexLocker mu(thread, Compile_lock);
1263 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1264 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1265 // This is assumed to be an 'atomic' operation by verification.
1266 // So keep it under lock for now.
1267 deopt_scope.deoptimize_marked();
1268 }
1269 }
1270 JVM_END
1271
1272 JVM_ENTRY_PROF(void, MHN_copyOutBootstrapArguments, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1273 jobject caller_jh, jintArray index_info_jh,
1274 jint start, jint end,
1275 jobjectArray buf_jh, jint pos,
1276 jboolean resolve, jobject ifna_jh)) {
1277 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1278 if (caller_k == nullptr || !caller_k->is_instance_klass()) {
1279 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1280 }
1281 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1282 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1283 if (index_info_oop == nullptr ||
1284 index_info_oop->klass() != Universe::intArrayKlass() ||
1285 typeArrayOop(index_info_oop)->length() < 2) {
1286 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1287 }
1288 typeArrayHandle index_info(THREAD, index_info_oop);
1289 int bss_index_in_pool = index_info->int_at(1);
1290 // While we are here, take a quick look at the index info:
1291 if (bss_index_in_pool <= 0 ||
1292 bss_index_in_pool >= caller->constants()->length() ||
1293 index_info->int_at(0)
1294 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1295 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1296 }
1297 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1298 if (start < 0) {
1299 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1300 if (start == pseudo_index) {
1301 if (start >= end || 0 > pos || pos >= buf->length()) break;
1302 oop pseudo_arg = nullptr;
1303 switch (pseudo_index) {
1304 case -4: // bootstrap method
1305 {
1306 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool);
1307 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1308 break;
1309 }
1310 case -3: // name
1311 {
1312 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic);
1313 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1314 pseudo_arg = str();
1315 break;
1316 }
1317 case -2: // type
1318 {
1319 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic);
1320 Handle th;
1321 if (type->char_at(0) == JVM_SIGNATURE_FUNC) {
1322 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1323 } else {
1324 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1325 }
1326 pseudo_arg = th();
1327 break;
1328 }
1329 case -1: // argument count
1330 {
1331 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool);
1332 jvalue argc_value; argc_value.i = (jint)argc;
1333 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1334 break;
1335 }
1336 }
1337
1338 // Store the pseudo-argument, and advance the pointers.
1339 buf->obj_at_put(pos++, pseudo_arg);
1340 ++start;
1341 }
1342 }
1343 // When we are done with this there may be regular arguments to process too.
1344 }
1345 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1346 caller->constants()->
1347 copy_bootstrap_arguments_at(bss_index_in_pool,
1348 start, end, buf, pos,
1349 (resolve == JNI_TRUE), ifna, CHECK);
1350 }
1351 JVM_END
1352
1353 /**
1354 * Throws a java/lang/UnsupportedOperationException unconditionally.
1355 * This is required by the specification of MethodHandle.invoke if
1356 * invoked directly.
1357 */
1358 JVM_ENTRY_PROF(jobject, MH_invoke_UOE, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1359 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1360 return nullptr;
1361 }
1362 JVM_END
1363
1364 /**
1365 * Throws a java/lang/UnsupportedOperationException unconditionally.
1366 * This is required by the specification of MethodHandle.invokeExact if
1367 * invoked directly.
1368 */
1369 JVM_ENTRY_PROF(jobject, MH_invokeExact_UOE, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1370 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1371 return nullptr;
1372 }
1373 JVM_END
1374
1375 /**
1376 * Throws a java/lang/UnsupportedOperationException unconditionally.
1377 * This is required by the specification of VarHandle.{access-mode} if
1378 * invoked directly.
1379 */
1380 JVM_ENTRY(jobject, VH_UOE(JNIEnv* env, jobject vh, jobjectArray args)) {
1381 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "VarHandle access mode methods cannot be invoked reflectively");
1382 return nullptr;
1383 }
1384 JVM_END
1385
1386
1387 /// JVM_RegisterMethodHandleMethods
1388
1389 #define LANG "Ljava/lang/"
1390 #define JLINV "Ljava/lang/invoke/"
1391
1392 #define OBJ LANG "Object;"
1393 #define CLS LANG "Class;"
1394 #define STRG LANG "String;"
1395 #define CS JLINV "CallSite;"
1396 #define MT JLINV "MethodType;"
1397 #define MH JLINV "MethodHandle;"
1398 #define MEM JLINV "MemberName;"
1399
1400 #define CC (char*) /*cast a literal from (const char*)*/
1401 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1402
1403 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1404 static JNINativeMethod MHN_methods[] = {
1405 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1406 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1407 {CC "resolve", CC "(" MEM "" CLS "IZ)" MEM, FN_PTR(MHN_resolve_Mem)},
1408 // static native int getNamedCon(int which, Object[] name)
1409 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1410 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1411 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1412 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1413 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1414 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1415 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1416 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1417 };
1418
1419 static JNINativeMethod MH_methods[] = {
1420 // UnsupportedOperationException throwers
1421 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1422 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1423 };
1424 static JNINativeMethod VH_methods[] = {
1425 // UnsupportedOperationException throwers
1426 {CC "get", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1427 {CC "set", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1428 {CC "getVolatile", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1429 {CC "setVolatile", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1430 {CC "getAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1431 {CC "setRelease", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1432 {CC "getOpaque", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1433 {CC "setOpaque", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1434 {CC "compareAndSet", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1435 {CC "compareAndExchange", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1436 {CC "compareAndExchangeAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1437 {CC "compareAndExchangeRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1438 {CC "weakCompareAndSetPlain", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1439 {CC "weakCompareAndSet", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1440 {CC "weakCompareAndSetAcquire", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1441 {CC "weakCompareAndSetRelease", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1442 {CC "getAndSet", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1443 {CC "getAndSetAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1444 {CC "getAndSetRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1445 {CC "getAndAdd", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1446 {CC "getAndAddAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1447 {CC "getAndAddRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1448 {CC "getAndBitwiseOr", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1449 {CC "getAndBitwiseOrAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1450 {CC "getAndBitwiseOrRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1451 {CC "getAndBitwiseAnd", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1452 {CC "getAndBitwiseAndAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1453 {CC "getAndBitwiseAndRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1454 {CC "getAndBitwiseXor", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1455 {CC "getAndBitwiseXorAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1456 {CC "getAndBitwiseXorRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)}
1457 };
1458
1459 /**
1460 * This one function is exported, used by NativeLookup.
1461 */
1462 JVM_ENTRY_PROF(void, JVM_RegisterMethodHandleMethods, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1463 assert(!MethodHandles::enabled(), "must not be enabled");
1464 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
1465 assert(vmClasses::VarHandle_klass() != nullptr, "should be present");
1466
1467 oop mh_mirror = vmClasses::MethodHandle_klass()->java_mirror();
1468 oop vh_mirror = vmClasses::VarHandle_klass()->java_mirror();
1469 jclass MH_class = (jclass) JNIHandles::make_local(THREAD, mh_mirror);
1470 jclass VH_class = (jclass) JNIHandles::make_local(THREAD, vh_mirror);
1471
1472 {
1473 ThreadToNativeFromVM ttnfv(thread);
1474
1475 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1476 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1477 "register java.lang.invoke.MethodHandleNative natives");
1478
1479 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1480 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1481 "register java.lang.invoke.MethodHandle natives");
1482
1483 status = env->RegisterNatives(VH_class, VH_methods, sizeof(VH_methods)/sizeof(JNINativeMethod));
1484 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1485 "register java.lang.invoke.VarHandle natives");
1486 }
1487
1488 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1489
1490 MethodHandles::set_enabled(true);
1491 }
1492 JVM_END
1493
1494 #define DO_COUNTERS(macro) \
1495 macro(MHN_init_Mem) \
1496 macro(MHN_expand_Mem) \
1497 macro(MHN_resolve_Mem) \
1498 macro(MHN_checkArchivable) \
1499 macro(MHN_getNamedCon) \
1500 macro(MHN_objectFieldOffset) \
1501 macro(MHN_setCallSiteTargetNormal) \
1502 macro(MHN_setCallSiteTargetVolatile) \
1503 macro(MHN_copyOutBootstrapArguments) \
1504 macro(MHN_staticFieldOffset) \
1505 macro(MHN_staticFieldBase) \
1506 macro(MHN_getMemberVMInfo) \
1507 macro(MH_invoke_UOE) \
1508 macro(MH_invokeExact_UOE) \
1509 macro(JVM_RegisterMethodHandleMethods)
1510
1511 #define INIT_COUNTER(name) \
1512 NEWPERFTICKCOUNTERS(_perf_##name##_timer, SUN_RT, #name); \
1513 NEWPERFEVENTCOUNTER(_perf_##name##_count, SUN_RT, #name "_count"); \
1514
1515 void MethodHandles::init_counters() {
1516 if (UsePerfData) {
1517 EXCEPTION_MARK;
1518
1519 DO_COUNTERS(INIT_COUNTER)
1520
1521 if (HAS_PENDING_EXCEPTION) {
1522 vm_exit_during_initialization("perf_mhn_init failed unexpectedly");
1523 }
1524 }
1525 }
1526
1527 #undef INIT_COUNTER
1528
1529 #define PRINT_COUNTER(name) {\
1530 jlong count = _perf_##name##_count->get_value(); \
1531 if (count > 0) { \
1532 st->print_cr(" %-40s = " JLONG_FORMAT_W(6) "us (elapsed) " JLONG_FORMAT_W(6) "us (thread) (" JLONG_FORMAT_W(5) " events)", #name, \
1533 _perf_##name##_timer->elapsed_counter_value_us(), \
1534 _perf_##name##_timer->thread_counter_value_us(), \
1535 count); \
1536 }}
1537
1538 void MethodHandles::print_counters_on(outputStream* st) {
1539 if (ProfileVMCalls && UsePerfData) {
1540 DO_COUNTERS(PRINT_COUNTER)
1541 } else {
1542 st->print_cr(" MHN: no info (%s is disabled)", (UsePerfData ? "ProfileVMCalls" : "UsePerfData"));
1543 }
1544 }
1545
1546 #undef PRINT_COUNTER