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