1 /*
2 * Copyright (c) 2008, 2026, 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/linkResolver.hpp"
35 #include "interpreter/oopMapCache.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/reflection.hpp"
56 #include "runtime/safepointVerifiers.hpp"
57 #include "runtime/signature.hpp"
58 #include "runtime/stubRoutines.hpp"
59 #include "runtime/timerTrace.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 #ifdef ASSERT
161 const char* MethodHandles::ref_kind_to_verify_msg(int ref_kind) {
162 switch (ref_kind) {
163 case JVM_REF_invokeSpecial: return "verify_ref_kind expected invokeSpecial";
164 case JVM_REF_invokeStatic: return "verify_ref_kind expected invokeStatic";
165 case JVM_REF_invokeVirtual: return "verify_ref_kind expected invokeVirtual";
166 case JVM_REF_invokeInterface: return "verify_ref_kind expected invokeInterface";
167 default: assert(false, "unexpected ref_kind: %d", ref_kind);
168 }
169 return "";
170 }
171 #endif
172
173 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
174 Handle empty;
175 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
176 if (!java_lang_String::is_instance(type())) {
177 return type; // already resolved
178 }
179 Symbol* signature = java_lang_String::as_symbol_or_null(type());
180 if (signature == nullptr) {
181 return empty; // no such signature exists in the VM
182 }
183 Handle resolved;
184 int flags = java_lang_invoke_MemberName::flags(mname());
185 switch (flags & ALL_KINDS) {
186 case IS_METHOD:
187 case IS_CONSTRUCTOR:
188 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
189 break;
190 case IS_FIELD:
191 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
192 break;
193 default:
194 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
195 }
196 if (resolved.is_null()) {
197 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
198 }
199 return resolved;
200 }
201
202 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
203 // This method is used from java.lang.invoke.MemberName constructors.
204 // It fills in the new MemberName from a java.lang.reflect.Member.
205 oop target_oop = target();
206 Klass* target_klass = target_oop->klass();
207 if (target_klass == vmClasses::reflect_Field_klass()) {
208 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
209 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
210 Klass* k = java_lang_Class::as_Klass(clazz);
211 if (k != nullptr && k->is_instance_klass()) {
212 fieldDescriptor fd(InstanceKlass::cast(k), slot);
213 oop mname2 = init_field_MemberName(mname, fd);
214 if (mname2 != nullptr) {
215 // Since we have the reified name and type handy, add them to the result.
216 if (java_lang_invoke_MemberName::name(mname2) == nullptr)
217 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
218 if (java_lang_invoke_MemberName::type(mname2) == nullptr)
219 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
220 }
221 return mname2;
222 }
223 } else if (target_klass == vmClasses::reflect_Method_klass()) {
224 oop clazz = java_lang_reflect_Method::clazz(target_oop);
225 int slot = java_lang_reflect_Method::slot(target_oop);
226 Klass* k = java_lang_Class::as_Klass(clazz);
227 if (k != nullptr && k->is_instance_klass()) {
228 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
229 if (m == nullptr || is_signature_polymorphic(m->intrinsic_id()))
230 return nullptr; // do not resolve unless there is a concrete signature
231 CallInfo info(m, k, CHECK_NULL);
232 return init_method_MemberName(mname, info);
233 }
234 } else if (target_klass == vmClasses::reflect_Constructor_klass()) {
235 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
236 int slot = java_lang_reflect_Constructor::slot(target_oop);
237 Klass* k = java_lang_Class::as_Klass(clazz);
238 if (k != nullptr && k->is_instance_klass()) {
239 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
240 if (m == nullptr) return nullptr;
241 CallInfo info(m, k, CHECK_NULL);
242 return init_method_MemberName(mname, info);
243 }
244 }
245 return nullptr;
246 }
247
248 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
249 assert(info.resolved_appendix().is_null(), "only normal methods here");
250 methodHandle m(Thread::current(), info.resolved_method());
251 assert(m.not_null(), "null method handle");
252 InstanceKlass* m_klass = m->method_holder();
253 assert(m_klass != nullptr, "null holder for method handle");
254 int flags = (m->access_flags().as_method_flags());
255 int vmindex = Method::invalid_vtable_index;
256 LogTarget(Debug, methodhandles, indy) lt_indy;
257
258 switch (info.call_kind()) {
259 case CallInfo::itable_call:
260 vmindex = info.itable_index();
261 // More importantly, the itable index only works with the method holder.
262 assert(m_klass->verify_itable_index(vmindex), "");
263 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
264 if (lt_indy.is_enabled()) {
265 ResourceMark rm;
266 LogStream ls(lt_indy);
267 ls.print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
268 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
269 vmindex);
270 m->access_flags().print_on(&ls);
271 if (!m->is_abstract()) {
272 if (!m->is_private()) {
273 ls.print("default");
274 }
275 else {
276 ls.print("private-intf");
277 }
278 }
279 ls.cr();
280 }
281 break;
282
283 case CallInfo::vtable_call:
284 vmindex = info.vtable_index();
285 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
286 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
287 if (m_klass->is_interface()) {
288 // This is a vtable call to an interface method (abstract "miranda method" or default method).
289 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
290 // (LinkResolver should help us figure this out.)
291 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass");
292 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass());
293 if (m_klass_non_interface->is_interface()) {
294 m_klass_non_interface = vmClasses::Object_klass();
295 #ifdef ASSERT
296 { ResourceMark rm;
297 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
298 assert(m->name() == m2->name() && m->signature() == m2->signature(),
299 "at %d, %s != %s", vmindex,
300 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
301 }
302 #endif //ASSERT
303 }
304 if (!m->is_public()) {
305 assert(m->is_public(), "virtual call must be to public interface method");
306 return nullptr; // elicit an error later in product build
307 }
308 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
309 m_klass = m_klass_non_interface;
310 }
311 if (lt_indy.is_enabled()) {
312 ResourceMark rm;
313 LogStream ls(lt_indy);
314 ls.print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
315 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
316 m_klass->internal_name(), vmindex);
317 m->access_flags().print_on(&ls);
318 if (m->is_default_method()) {
319 ls.print("default");
320 }
321 ls.cr();
322 }
323 break;
324
325 case CallInfo::direct_call:
326 vmindex = Method::nonvirtual_vtable_index;
327 if (m->is_static()) {
328 assert(!m->is_static_initializer(), "Cannot be static initializer");
329 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
330 } else if (m->is_object_initializer()) {
331 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
332 } else {
333 // "special" reflects that this is a direct call, not that it
334 // necessarily originates from an invokespecial. We can also do
335 // direct calls for private and/or final non-static methods.
336 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
337 }
338 break;
339
340 default: assert(false, "bad CallInfo"); return nullptr;
341 }
342
343 // @CallerSensitive annotation detected
344 if (m->caller_sensitive()) {
345 flags |= CALLER_SENSITIVE;
346 }
347
348 Handle resolved_method = info.resolved_method_name();
349 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(),
350 "Should not change after link resolution");
351
352 oop mname_oop = mname();
353 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
354 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
355 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
356 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
357 // Note: name and type can be lazily computed by resolve_MemberName,
358 // if Java code needs them as resolved String and MethodType objects.
359 // If relevant, the vtable or itable value is stored as vmindex.
360 // This is done eagerly, since it is readily available without
361 // constructing any new objects.
362 return mname();
363 }
364
365 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
366 InstanceKlass* ik = fd.field_holder();
367 int flags = fd.access_flags().as_field_flags();
368 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
369 if (fd.is_trusted_final()) flags |= TRUSTED_FINAL;
370 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
371 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
372
373 oop mname_oop = mname();
374 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
375 java_lang_invoke_MemberName::set_method (mname_oop, nullptr);
376 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
377 java_lang_invoke_MemberName::set_clazz (mname_oop, ik->java_mirror());
378
379 oop type = field_signature_type_or_null(fd.signature());
380 oop name = field_name_or_null(fd.name());
381 if (name != nullptr)
382 java_lang_invoke_MemberName::set_name(mname_oop, name);
383 if (type != nullptr)
384 java_lang_invoke_MemberName::set_type(mname_oop, type);
385 // Note: name and type can be lazily computed by resolve_MemberName,
386 // if Java code needs them as resolved String and Class objects.
387 // Note that the incoming type oop might be pre-resolved (non-null).
388 // The base clazz and field offset (vmindex) must be eagerly stored,
389 // because they unambiguously identify the field.
390 // Although the fieldDescriptor::_index would also identify the field,
391 // we do not use it, because it is harder to decode.
392 // TO DO: maybe intern mname_oop
393 return mname();
394 }
395
396 // JVM 2.9 Special Methods:
397 // A method is signature polymorphic if and only if all of the following conditions hold :
398 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
399 // * It has a single formal parameter of type Object[].
400 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
401 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
402 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
403 if (klass == nullptr)
404 return false;
405 // The following test will fail spuriously during bootstrap of MethodHandle itself:
406 // if (klass != vmClasses::MethodHandle_klass())
407 // Test the name instead:
408 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
409 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
410 return false;
411 }
412
413 // Look up signature polymorphic method with polymorphic return type
414 Symbol* poly_sig = vmSymbols::object_array_object_signature();
415 InstanceKlass* iklass = InstanceKlass::cast(klass);
416 Method* m = iklass->find_method(name, poly_sig);
417 if (m != nullptr) {
418 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
419 int flags = m->access_flags().as_method_flags();
420 if ((flags & required) == required) {
421 return true;
422 }
423 }
424
425 // Look up signature polymorphic method with non-polymorphic (non Object) return type
426 int me;
427 int ms = iklass->find_method_by_name(name, &me);
428 if (ms == -1) return false;
429 for (; ms < me; ms++) {
430 Method* m = iklass->methods()->at(ms);
431 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
432 int flags = m->access_flags().as_method_flags();
433 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
434 return true;
435 }
436 }
437 return false;
438 }
439
440
441 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
442 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
443 switch (iid) {
444 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
445 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
446 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
447 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
448 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
449 case vmIntrinsics::_linkToNative: return vmSymbols::linkToNative_name();
450 default:
451 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
452 }
453 }
454
455 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
456 switch(id) {
457 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
458 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
459 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
460 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
461 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
462 default:
463 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
464 }
465 }
466
467 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
468 switch (iid) {
469 case vmIntrinsics::_invokeBasic: return 0;
470 case vmIntrinsics::_linkToNative: return 0;
471 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
472 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
473 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
474 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
475 default:
476 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
477 }
478 }
479
480 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
481 vmSymbolID name_id = vmSymbols::find_sid(name);
482 switch (name_id) {
483 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
484 case VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
485 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
486 case VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
487
488 // There is one static signature-polymorphic method for each JVM invocation mode.
489 case VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
490 case VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
491 case VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
492 case VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
493 case VM_SYMBOL_ENUM_NAME(linkToNative_name): return vmIntrinsics::_linkToNative;
494 default: break;
495 }
496
497 // Cover the case of invokeExact and any future variants of invokeFoo.
498 Klass* mh_klass = vmClasses::klass_at(VM_CLASS_ID(MethodHandle_klass));
499 if (mh_klass != nullptr && is_method_handle_invoke_name(mh_klass, name)) {
500 return vmIntrinsics::_invokeGeneric;
501 }
502
503 // Cover the case of methods on VarHandle.
504 Klass* vh_klass = vmClasses::klass_at(VM_CLASS_ID(VarHandle_klass));
505 if (vh_klass != nullptr && is_method_handle_invoke_name(vh_klass, name)) {
506 return vmIntrinsics::_invokeGeneric;
507 }
508
509 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
510 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
511 return vmIntrinsics::_none;
512 }
513
514 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
515 if (klass != nullptr &&
516 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
517 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
518 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
519 if (iid != vmIntrinsics::_none)
520 return iid;
521 if (is_method_handle_invoke_name(klass, name))
522 return vmIntrinsics::_invokeGeneric;
523 }
524 return vmIntrinsics::_none;
525 }
526
527 // Returns true if method is signature polymorphic and public
528 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
529 if (is_signature_polymorphic_name(klass, name)) {
530 InstanceKlass* iklass = InstanceKlass::cast(klass);
531 int me;
532 int ms = iklass->find_method_by_name(name, &me);
533 assert(ms != -1, "");
534 for (; ms < me; ms++) {
535 Method* m = iklass->methods()->at(ms);
536 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
537 int flags = m->access_flags().as_method_flags();
538 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
539 return true;
540 }
541 }
542 }
543 return false;
544 }
545
546 // convert the external string or reflective type to an internal signature
547 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
548 if (java_lang_invoke_MethodType::is_instance(type_str)) {
549 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
550 } else if (java_lang_Class::is_instance(type_str)) {
551 return java_lang_Class::as_signature(type_str, false);
552 } else if (java_lang_String::is_instance(type_str)) {
553 if (intern_if_not_found) {
554 return java_lang_String::as_symbol(type_str);
555 } else {
556 return java_lang_String::as_symbol_or_null(type_str);
557 }
558 } else {
559 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", nullptr);
560 }
561 }
562
563 static const char OBJ_SIG[] = "Ljava/lang/Object;";
564 enum { OBJ_SIG_LEN = 18 };
565
566 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
567 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
568 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
569 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) {
570 switch (ss.type()) {
571 case T_OBJECT:
572 // only java/lang/Object is valid here
573 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, ss.raw_length()) != 0)
574 return false;
575 break;
576 case T_VOID:
577 case T_INT:
578 case T_LONG:
579 case T_FLOAT:
580 case T_DOUBLE:
581 break;
582 default:
583 // subword types (T_BYTE etc.), Q-descriptors, arrays
584 return false;
585 }
586 }
587 return true;
588 }
589
590 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg) {
591 Symbol* bsig = nullptr;
592 if (sig == nullptr) {
593 return sig;
594 } else if (is_basic_type_signature(sig)) {
595 sig->increment_refcount();
596 return sig; // that was easy
597 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) {
598 BasicType bt = Signature::basic_type(sig);
599 if (is_subword_type(bt)) {
600 bsig = vmSymbols::int_signature();
601 } else {
602 assert(is_reference_type(bt), "is_basic_type_signature was false");
603 bsig = vmSymbols::object_signature();
604 }
605 } else {
606 ResourceMark rm;
607 stringStream buffer(128);
608 buffer.put(JVM_SIGNATURE_FUNC);
609 int arg_pos = 0, keep_arg_pos = -1;
610 if (keep_last_arg)
611 keep_arg_pos = ArgumentCount(sig).size() - 1;
612 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
613 BasicType bt = ss.type();
614 size_t this_arg_pos = buffer.size();
615 if (ss.at_return_type()) {
616 buffer.put(JVM_SIGNATURE_ENDFUNC);
617 }
618 if (arg_pos == keep_arg_pos) {
619 buffer.write((char*) ss.raw_bytes(),
620 (int) ss.raw_length());
621 } else if (is_reference_type(bt)) {
622 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
623 } else {
624 if (is_subword_type(bt))
625 bt = T_INT;
626 buffer.put(type2char(bt));
627 }
628 arg_pos++;
629 }
630 const char* sigstr = buffer.base();
631 int siglen = (int) buffer.size();
632 bsig = SymbolTable::new_symbol(sigstr, siglen);
633 }
634 assert(is_basic_type_signature(bsig) ||
635 // detune assert in case the injected argument is not a basic type:
636 keep_last_arg, "");
637 return bsig;
638 }
639
640 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
641 Symbol* sig) {
642 st = st ? st : tty;
643 bool prev_type = false;
644 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC);
645 if (is_method) st->put(JVM_SIGNATURE_FUNC);
646 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
647 if (ss.at_return_type())
648 st->put(JVM_SIGNATURE_ENDFUNC);
649 else if (prev_type)
650 st->put(',');
651 const char* cp = (const char*) ss.raw_bytes();
652 if (ss.is_array()) {
653 st->put(JVM_SIGNATURE_ARRAY);
654 if (ss.array_prefix_length() == 1)
655 st->put(cp[1]);
656 else
657 st->put(JVM_SIGNATURE_CLASS);
658 } else {
659 st->put(cp[0]);
660 }
661 }
662 }
663
664
665
666 static oop object_java_mirror() {
667 return vmClasses::Object_klass()->java_mirror();
668 }
669
670 oop MethodHandles::field_name_or_null(Symbol* s) {
671 if (s == nullptr) return nullptr;
672 return StringTable::lookup(s);
673 }
674
675 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
676 if (s == nullptr) return nullptr;
677 BasicType bt = Signature::basic_type(s);
678 if (is_java_primitive(bt)) {
679 assert(s->utf8_length() == 1, "");
680 return java_lang_Class::primitive_mirror(bt);
681 }
682 // Here are some more short cuts for common types.
683 // They are optional, since reference types can be resolved lazily.
684 if (bt == T_OBJECT) {
685 if (s == vmSymbols::object_signature()) {
686 return object_java_mirror();
687 } else if (s == vmSymbols::class_signature()) {
688 return vmClasses::Class_klass()->java_mirror();
689 } else if (s == vmSymbols::string_signature()) {
690 return vmClasses::String_klass()->java_mirror();
691 }
692 }
693 return nullptr;
694 }
695
696 // An unresolved member name is a mere symbolic reference.
697 // Resolving it plants a vmtarget/vmindex in it,
698 // which refers directly to JVM internals.
699 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, int lookup_mode,
700 bool speculative_resolve, TRAPS) {
701 Handle empty;
702 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
703
704 if (java_lang_invoke_MemberName::vmtarget(mname()) != nullptr) {
705 // Already resolved.
706 DEBUG_ONLY(intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()));
707 assert(vmindex >= Method::nonvirtual_vtable_index, "");
708 return mname;
709 }
710
711 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
712 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
713 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
714 int flags = java_lang_invoke_MemberName::flags(mname());
715 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
716 if (!ref_kind_is_valid(ref_kind)) {
717 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
718 }
719
720 DEBUG_ONLY(intptr_t old_vmindex);
721 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
722
723 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
724 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
725 }
726
727 InstanceKlass* defc = nullptr;
728 {
729 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
730 if (defc_klass == nullptr) return empty; // a primitive; no resolution possible
731 if (!defc_klass->is_instance_klass()) {
732 if (!defc_klass->is_array_klass()) return empty;
733 defc_klass = vmClasses::Object_klass();
734 }
735 defc = InstanceKlass::cast(defc_klass);
736 }
737 if (defc == nullptr) {
738 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
739 }
740 defc->link_class(CHECK_(empty)); // possible safepoint
741
742 // convert the external string name to an internal symbol
743 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
744 if (name == nullptr) return empty; // no such name
745 if (name == vmSymbols::class_initializer_name())
746 return empty; // illegal name
747
748 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
749 if ((flags & ALL_KINDS) == IS_METHOD &&
750 (defc == vmClasses::MethodHandle_klass() || defc == vmClasses::VarHandle_klass()) &&
751 (ref_kind == JVM_REF_invokeVirtual ||
752 ref_kind == JVM_REF_invokeSpecial ||
753 // static invocation mode is required for _linkToVirtual, etc.:
754 ref_kind == JVM_REF_invokeStatic)) {
755 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
756 if (iid != vmIntrinsics::_none &&
757 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
758 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
759 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
760 mh_invoke_id = iid;
761 }
762 }
763
764 // convert the external string or reflective type to an internal signature
765 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
766 if (type == nullptr) return empty; // no such signature exists in the VM
767
768 // skip access check if it's trusted lookup
769 LinkInfo::AccessCheck access_check = caller != nullptr ?
770 LinkInfo::AccessCheck::required :
771 LinkInfo::AccessCheck::skip;
772 // skip loader constraints if it's trusted lookup or a public lookup
773 LinkInfo::LoaderConstraintCheck loader_constraint_check = (caller != nullptr && (lookup_mode & LM_UNCONDITIONAL) == 0) ?
774 LinkInfo::LoaderConstraintCheck::required :
775 LinkInfo::LoaderConstraintCheck::skip;
776
777 // Time to do the lookup.
778 switch (flags & ALL_KINDS) {
779 case IS_METHOD:
780 {
781 CallInfo result;
782 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
783 {
784 assert(!HAS_PENDING_EXCEPTION, "");
785 if (ref_kind == JVM_REF_invokeStatic) {
786 LinkResolver::resolve_static_call(result,
787 link_info, ClassInitMode::dont_init, THREAD);
788 } else if (ref_kind == JVM_REF_invokeInterface) {
789 LinkResolver::resolve_interface_call(result, Handle(), defc,
790 link_info, false, THREAD);
791 } else if (mh_invoke_id != vmIntrinsics::_none) {
792 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
793 LinkResolver::resolve_handle_call(result, link_info, THREAD);
794 } else if (ref_kind == JVM_REF_invokeSpecial) {
795 LinkResolver::resolve_special_call(result, Handle(),
796 link_info, THREAD);
797 } else if (ref_kind == JVM_REF_invokeVirtual) {
798 LinkResolver::resolve_virtual_call(result, Handle(), defc,
799 link_info, false, THREAD);
800 } else {
801 assert(false, "ref_kind=%d", ref_kind);
802 }
803 if (HAS_PENDING_EXCEPTION) {
804 if (speculative_resolve) {
805 CLEAR_PENDING_EXCEPTION;
806 }
807 return empty;
808 }
809 }
810 if (result.resolved_appendix().not_null()) {
811 // The resolved MemberName must not be accompanied by an appendix argument,
812 // since there is no way to bind this value into the MemberName.
813 // Caller is responsible to prevent this from happening.
814 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
815 }
816 result.set_resolved_method_name(CHECK_(empty));
817 oop mname2 = init_method_MemberName(mname, result);
818 return Handle(THREAD, mname2);
819 }
820 case IS_CONSTRUCTOR:
821 {
822 CallInfo result;
823 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
824 {
825 assert(!HAS_PENDING_EXCEPTION, "");
826 if (name == vmSymbols::object_initializer_name()) {
827 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
828 } else {
829 break; // will throw after end of switch
830 }
831 if (HAS_PENDING_EXCEPTION) {
832 if (speculative_resolve) {
833 CLEAR_PENDING_EXCEPTION;
834 }
835 return empty;
836 }
837 }
838 assert(result.is_statically_bound(), "");
839 result.set_resolved_method_name(CHECK_(empty));
840 oop mname2 = init_method_MemberName(mname, result);
841 return Handle(THREAD, mname2);
842 }
843 case IS_FIELD:
844 {
845 fieldDescriptor result; // find_field initializes fd if found
846 {
847 assert(!HAS_PENDING_EXCEPTION, "");
848 LinkInfo link_info(defc, name, type, caller, LinkInfo::AccessCheck::skip, loader_constraint_check);
849 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, ClassInitMode::dont_init, THREAD);
850 if (HAS_PENDING_EXCEPTION) {
851 if (speculative_resolve) {
852 CLEAR_PENDING_EXCEPTION;
853 }
854 return empty;
855 }
856 }
857 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
858 return Handle(THREAD, mname2);
859 }
860 default:
861 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
862 }
863
864 return empty;
865 }
866
867 // Conversely, a member name which is only initialized from JVM internals
868 // may have null defc, name, and type fields.
869 // Resolving it plants a vmtarget/vmindex in it,
870 // which refers directly to JVM internals.
871 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
872 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
873
874 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != nullptr);
875 bool have_name = (java_lang_invoke_MemberName::name(mname()) != nullptr);
876 bool have_type = (java_lang_invoke_MemberName::type(mname()) != nullptr);
877 int flags = java_lang_invoke_MemberName::flags(mname());
878
879 if (suppress != 0) {
880 if (suppress & _suppress_defc) have_defc = true;
881 if (suppress & _suppress_name) have_name = true;
882 if (suppress & _suppress_type) have_type = true;
883 }
884
885 if (have_defc && have_name && have_type) return; // nothing needed
886
887 switch (flags & ALL_KINDS) {
888 case IS_METHOD:
889 case IS_CONSTRUCTOR:
890 {
891 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
892 if (vmtarget == nullptr) {
893 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
894 }
895 methodHandle m(THREAD, vmtarget);
896 DEBUG_ONLY(vmtarget = nullptr); // safety
897 if (!have_defc) {
898 InstanceKlass* defc = m->method_holder();
899 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
900 }
901 if (!have_name) {
902 //not java_lang_String::create_from_symbol; let's intern member names
903 oop name = StringTable::intern(m->name(), CHECK);
904 java_lang_invoke_MemberName::set_name(mname(), name);
905 }
906 if (!have_type) {
907 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
908 java_lang_invoke_MemberName::set_type(mname(), type());
909 }
910 return;
911 }
912 case IS_FIELD:
913 {
914 oop clazz = java_lang_invoke_MemberName::clazz(mname());
915 if (clazz == nullptr) {
916 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
917 }
918 InstanceKlass* defc = java_lang_Class::as_InstanceKlass(clazz);
919 DEBUG_ONLY(clazz = nullptr); // safety
920 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
921 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
922 fieldDescriptor fd; // find_field initializes fd if found
923 if (!defc->find_field_from_offset(checked_cast<int>(vmindex), is_static, &fd))
924 break; // cannot expand
925 if (!have_name) {
926 //not java_lang_String::create_from_symbol; let's intern member names
927 oop name = StringTable::intern(fd.name(), CHECK);
928 java_lang_invoke_MemberName::set_name(mname(), name);
929 }
930 if (!have_type) {
931 // If it is a primitive field type, don't mess with short strings like "I".
932 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
933 if (type.is_null()) {
934 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
935 }
936 java_lang_invoke_MemberName::set_type(mname(), type());
937 }
938 return;
939 }
940 }
941 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
942 }
943
944 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
945 assert_lock_strong(CodeCache_lock);
946 DependencyContext deps = java_lang_invoke_CallSite::vmdependencies(call_site);
947 deps.add_dependent_nmethod(nm);
948 }
949
950 void MethodHandles::clean_dependency_context(oop call_site) {
951 DependencyContext deps = java_lang_invoke_CallSite::vmdependencies(call_site);
952 deps.clean_unloading_dependents();
953 }
954
955 void MethodHandles::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, Handle call_site, Handle target) {
956 assert_lock_strong(Compile_lock);
957
958 CallSiteDepChange changes(call_site, target);
959 {
960 NoSafepointVerifier nsv;
961 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
962
963 DependencyContext deps = java_lang_invoke_CallSite::vmdependencies(call_site());
964 deps.mark_dependent_nmethods(deopt_scope, changes);
965 }
966 }
967
968 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
969 if (log_is_enabled(Info, methodhandles)) {
970 const char* name = vmIntrinsics::name_at(iid);
971 if (*name == '_') name += 1;
972 const size_t len = strlen(name) + 50;
973 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
974 const char* suffix = "";
975 if (is_signature_polymorphic(iid)) {
976 if (is_signature_polymorphic_static(iid))
977 suffix = "/static";
978 else
979 suffix = "/private";
980 }
981 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
982 trace_method_handle(_masm, qname);
983 // LSan appears unable to keep track of qname, ignore it.
984 LSAN_IGNORE_OBJECT(qname);
985 // Note: Don't free the allocated char array because it's used
986 // during runtime.
987 }
988 }
989
990 //
991 // Here are the native methods in java.lang.invoke.MethodHandleNatives
992 // They are the private interface between this JVM and the HotSpot-specific
993 // Java code that implements JSR 292 method handles.
994 //
995 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
996 // that intrinsic (non-JNI) native methods are defined in HotSpot.
997 //
998
999 #ifndef PRODUCT
1000 #define EACH_NAMED_CON(template, requirement) \
1001 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1002 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1003 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1004 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1005 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1006 template(java_lang_invoke_MemberName,MN_TRUSTED_FINAL) \
1007 template(java_lang_invoke_MemberName,MN_HIDDEN_MEMBER) \
1008 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1009 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1010 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \
1011 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \
1012 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \
1013 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \
1014 template(java_lang_invoke_MemberName,MN_MODULE_MODE) \
1015 template(java_lang_invoke_MemberName,MN_UNCONDITIONAL_MODE) \
1016 template(java_lang_invoke_MemberName,MN_TRUSTED_MODE) \
1017 /*end*/
1018
1019 #define IGNORE_REQ(req_expr) /* req_expr */
1020 #define ONE_PLUS(scope,value) 1+
1021 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1022 #define VALUE_COMMA(scope,value) scope::value,
1023 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1024 #define STRING_NULL(scope,value) #value "\0"
1025 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1026
1027 static bool advertise_con_value(int which) {
1028 if (which < 0) return false;
1029 bool ok = true;
1030 int count = 0;
1031 #define INC_COUNT(scope,value) \
1032 ++count;
1033 #define CHECK_REQ(req_expr) \
1034 if (which < count) return ok; \
1035 ok = (req_expr);
1036 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1037 #undef INC_COUNT
1038 #undef CHECK_REQ
1039 assert(count == con_value_count, "");
1040 if (which < count) return ok;
1041 return false;
1042 }
1043
1044 #undef ONE_PLUS
1045 #undef VALUE_COMMA
1046 #undef STRING_NULL
1047 #undef EACH_NAMED_CON
1048 #endif // PRODUCT
1049
1050 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1051 #ifndef PRODUCT
1052 if (advertise_con_value(which)) {
1053 assert(which >= 0 && which < con_value_count, "");
1054 int con = con_values[which];
1055 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1056 if (box.not_null() && box->klass() == Universe::objectArrayKlass() && box->length() > 0) {
1057 const char* str = &con_names[0];
1058 for (int i = 0; i < which; i++)
1059 str += strlen(str) + 1; // skip name and null
1060 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1061 box->obj_at_put(0, name);
1062 }
1063 return con;
1064 }
1065 #endif
1066 return 0;
1067 }
1068 JVM_END
1069
1070 // void init(MemberName self, AccessibleObject ref)
1071 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1072 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1073 if (target_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1074 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1075 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1076 MethodHandles::init_MemberName(mname, target, CHECK);
1077 }
1078 JVM_END
1079
1080 // void expand(MemberName self)
1081 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1082 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1083 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1084 MethodHandles::expand_MemberName(mname, 0, CHECK);
1085 }
1086 JVM_END
1087
1088 // void resolve(MemberName self, Class<?> caller)
1089 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1090 jint lookup_mode, jboolean speculative_resolve)) {
1091 if (mname_jh == nullptr) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1092 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1093
1094 // The trusted Java code that calls this method should already have performed
1095 // access checks on behalf of the given caller. But, we can verify this.
1096 // This only verifies from the context of the lookup class. It does not
1097 // verify the lookup context for a Lookup object teleported from one module
1098 // to another. Such Lookup object can only access the intersection of the set
1099 // of accessible classes from both lookup class and previous lookup class.
1100 if (VerifyMethodHandles && (lookup_mode & LM_TRUSTED) == LM_TRUSTED && caller_jh != nullptr &&
1101 java_lang_invoke_MemberName::clazz(mname()) != nullptr) {
1102 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1103 if (reference_klass != nullptr && reference_klass->is_objArray_klass()) {
1104 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1105 }
1106
1107 // Reflection::verify_class_access can only handle instance classes.
1108 if (reference_klass != nullptr && reference_klass->is_instance_klass()) {
1109 // Emulate LinkResolver::check_klass_accessability.
1110 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1111 // access check on behalf of the caller if this is not a public lookup
1112 // i.e. lookup mode is not UNCONDITIONAL
1113 if ((lookup_mode & LM_UNCONDITIONAL) == 0
1114 && Reflection::verify_class_access(caller,
1115 InstanceKlass::cast(reference_klass),
1116 true) != Reflection::ACCESS_OK) {
1117 ResourceMark rm(THREAD);
1118 stringStream ss;
1119 ss.print("caller %s tried to access %s", caller->class_in_module_of_loader(),
1120 reference_klass->class_in_module_of_loader());
1121 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), ss.as_string());
1122 }
1123 }
1124 }
1125
1126 Klass* caller = caller_jh == nullptr ? nullptr :
1127 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1128 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, lookup_mode,
1129 speculative_resolve == JNI_TRUE,
1130 CHECK_NULL);
1131
1132 if (resolved.is_null()) {
1133 int flags = java_lang_invoke_MemberName::flags(mname());
1134 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1135 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1136 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1137 }
1138 if (speculative_resolve) {
1139 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1140 return nullptr;
1141 }
1142 if ((flags & ALL_KINDS) == IS_FIELD) {
1143 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1144 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1145 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1146 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1147 } else {
1148 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1149 }
1150 }
1151
1152 return JNIHandles::make_local(THREAD, resolved());
1153 }
1154 JVM_END
1155
1156 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1157 if (mname == nullptr ||
1158 java_lang_invoke_MemberName::clazz(mname) == nullptr) {
1159 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1160 } else {
1161 int flags = java_lang_invoke_MemberName::flags(mname);
1162 if ((flags & IS_FIELD) != 0 &&
1163 (must_be_static
1164 ? (flags & JVM_ACC_STATIC) != 0
1165 : (flags & JVM_ACC_STATIC) == 0)) {
1166 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname);
1167 return (jlong) vmindex;
1168 }
1169 }
1170 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1171 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1172 return 0;
1173 }
1174
1175 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1176 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1177 }
1178 JVM_END
1179
1180 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1181 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1182 }
1183 JVM_END
1184
1185 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1186 // use the other function to perform sanity checks:
1187 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1188 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1189 return JNIHandles::make_local(THREAD, clazz);
1190 }
1191 JVM_END
1192
1193 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1194 if (mname_jh == nullptr) return nullptr;
1195 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1196 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1197 objArrayHandle result = oopFactory::new_objArray_handle(vmClasses::Object_klass(), 2, CHECK_NULL);
1198 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1199 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1200 result->obj_at_put(0, x);
1201
1202 int flags = java_lang_invoke_MemberName::flags(mname());
1203 if ((flags & IS_FIELD) != 0) {
1204 x = java_lang_invoke_MemberName::clazz(mname());
1205 } else {
1206 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1207 assert(vmtarget != nullptr && vmtarget->is_method(), "vmtarget is only method");
1208 x = mname();
1209 }
1210 result->obj_at_put(1, x);
1211 return JNIHandles::make_local(THREAD, result());
1212 }
1213 JVM_END
1214
1215 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1216 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1217 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1218 DeoptimizationScope deopt_scope;
1219 {
1220 // Walk all nmethods depending on this call site.
1221 MutexLocker mu(thread, Compile_lock);
1222 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1223 java_lang_invoke_CallSite::set_target(call_site(), target());
1224 // This is assumed to be an 'atomic' operation by verification.
1225 // So keep it under lock for now.
1226 deopt_scope.deoptimize_marked();
1227 }
1228 }
1229 JVM_END
1230
1231 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1232 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1233 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1234 DeoptimizationScope deopt_scope;
1235 {
1236 // Walk all nmethods depending on this call site.
1237 MutexLocker mu(thread, Compile_lock);
1238 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1239 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1240 // This is assumed to be an 'atomic' operation by verification.
1241 // So keep it under lock for now.
1242 deopt_scope.deoptimize_marked();
1243 }
1244 }
1245 JVM_END
1246
1247 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1248 jobject caller_jh, jintArray index_info_jh,
1249 jint start, jint end,
1250 jobjectArray buf_jh, jint pos,
1251 jboolean resolve, jobject ifna_jh)) {
1252 // caller->constants->copy_bootstrap_arguments_at performs a runtime
1253 // range check, but let's assert earlier as well.
1254 assert(start < end && start >= 0, "invariant");
1255 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1256 if (caller_k == nullptr || !caller_k->is_instance_klass()) {
1257 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1258 }
1259 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1260 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1261 if (index_info_oop == nullptr ||
1262 index_info_oop->klass() != Universe::intArrayKlass() ||
1263 typeArrayOop(index_info_oop)->length() < 2) {
1264 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1265 }
1266 typeArrayHandle index_info(THREAD, index_info_oop);
1267 int bss_index_in_pool = index_info->int_at(1);
1268 // While we are here, take a quick look at the index info:
1269 if (bss_index_in_pool <= 0 ||
1270 bss_index_in_pool >= caller->constants()->length() ||
1271 index_info->int_at(0)
1272 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1273 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1274 }
1275
1276 objArrayHandle buf(THREAD, (objArrayOop)JNIHandles::resolve(buf_jh));
1277
1278 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1279 caller->constants()->
1280 copy_bootstrap_arguments_at(bss_index_in_pool,
1281 start, end, buf, pos,
1282 (resolve == JNI_TRUE), ifna, CHECK);
1283 }
1284 JVM_END
1285
1286 /**
1287 * Throws a java/lang/UnsupportedOperationException unconditionally.
1288 * This is required by the specification of MethodHandle.invoke if
1289 * invoked directly.
1290 */
1291 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1292 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1293 return nullptr;
1294 }
1295 JVM_END
1296
1297 /**
1298 * Throws a java/lang/UnsupportedOperationException unconditionally.
1299 * This is required by the specification of MethodHandle.invokeExact if
1300 * invoked directly.
1301 */
1302 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1303 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1304 return nullptr;
1305 }
1306 JVM_END
1307
1308 /**
1309 * Throws a java/lang/UnsupportedOperationException unconditionally.
1310 * This is required by the specification of VarHandle.{access-mode} if
1311 * invoked directly.
1312 */
1313 JVM_ENTRY(jobject, VH_UOE(JNIEnv* env, jobject vh, jobjectArray args)) {
1314 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "VarHandle access mode methods cannot be invoked reflectively");
1315 return nullptr;
1316 }
1317 JVM_END
1318
1319
1320 /// JVM_RegisterMethodHandleMethods
1321
1322 #define LANG "Ljava/lang/"
1323 #define JLINV "Ljava/lang/invoke/"
1324
1325 #define OBJ LANG "Object;"
1326 #define CLS LANG "Class;"
1327 #define STRG LANG "String;"
1328 #define CS JLINV "CallSite;"
1329 #define MT JLINV "MethodType;"
1330 #define MH JLINV "MethodHandle;"
1331 #define MEM JLINV "MemberName;"
1332
1333 #define CC (char*) /*cast a literal from (const char*)*/
1334 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1335
1336 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1337 static JNINativeMethod MHN_methods[] = {
1338 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1339 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1340 {CC "resolve", CC "(" MEM "" CLS "IZ)" MEM, FN_PTR(MHN_resolve_Mem)},
1341 // static native int getNamedCon(int which, Object[] name)
1342 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1343 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1344 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1345 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1346 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1347 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1348 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1349 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1350 };
1351
1352 static JNINativeMethod MH_methods[] = {
1353 // UnsupportedOperationException throwers
1354 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1355 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1356 };
1357 static JNINativeMethod VH_methods[] = {
1358 // UnsupportedOperationException throwers
1359 {CC "get", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1360 {CC "set", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1361 {CC "getVolatile", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1362 {CC "setVolatile", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1363 {CC "getAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1364 {CC "setRelease", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1365 {CC "getOpaque", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1366 {CC "setOpaque", CC "([" OBJ ")V", FN_PTR(VH_UOE)},
1367 {CC "compareAndSet", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1368 {CC "compareAndExchange", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1369 {CC "compareAndExchangeAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1370 {CC "compareAndExchangeRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1371 {CC "weakCompareAndSetPlain", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1372 {CC "weakCompareAndSet", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1373 {CC "weakCompareAndSetAcquire", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1374 {CC "weakCompareAndSetRelease", CC "([" OBJ ")Z", FN_PTR(VH_UOE)},
1375 {CC "getAndSet", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1376 {CC "getAndSetAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1377 {CC "getAndSetRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1378 {CC "getAndAdd", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1379 {CC "getAndAddAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1380 {CC "getAndAddRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1381 {CC "getAndBitwiseOr", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1382 {CC "getAndBitwiseOrAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1383 {CC "getAndBitwiseOrRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1384 {CC "getAndBitwiseAnd", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1385 {CC "getAndBitwiseAndAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1386 {CC "getAndBitwiseAndRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1387 {CC "getAndBitwiseXor", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1388 {CC "getAndBitwiseXorAcquire", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)},
1389 {CC "getAndBitwiseXorRelease", CC "([" OBJ ")" OBJ, FN_PTR(VH_UOE)}
1390 };
1391
1392 /**
1393 * This one function is exported, used by NativeLookup.
1394 */
1395 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1396 assert(!MethodHandles::enabled(), "must not be enabled");
1397 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
1398 assert(vmClasses::VarHandle_klass() != nullptr, "should be present");
1399
1400 oop mh_mirror = vmClasses::MethodHandle_klass()->java_mirror();
1401 oop vh_mirror = vmClasses::VarHandle_klass()->java_mirror();
1402 jclass MH_class = (jclass) JNIHandles::make_local(THREAD, mh_mirror);
1403 jclass VH_class = (jclass) JNIHandles::make_local(THREAD, vh_mirror);
1404
1405 {
1406 ThreadToNativeFromVM ttnfv(thread);
1407
1408 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1409 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1410 "register java.lang.invoke.MethodHandleNative natives");
1411
1412 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1413 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1414 "register java.lang.invoke.MethodHandle natives");
1415
1416 status = env->RegisterNatives(VH_class, VH_methods, sizeof(VH_methods)/sizeof(JNINativeMethod));
1417 guarantee(status == JNI_OK && !env->ExceptionCheck(),
1418 "register java.lang.invoke.VarHandle natives");
1419 }
1420
1421 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1422
1423 MethodHandles::set_enabled(true);
1424 }
1425 JVM_END