1 /*
2 * Copyright (c) 2008, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmClasses.hpp"
31 #include "code/codeCache.hpp"
32 #include "code/dependencyContext.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "interpreter/oopMapCache.hpp"
36 #include "interpreter/linkResolver.hpp"
37 #include "jvm_io.h"
38 #include "logging/log.hpp"
39 #include "logging/logStream.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.hpp"
44 #include "oops/klass.inline.hpp"
45 #include "oops/objArrayKlass.hpp"
46 #include "oops/objArrayOop.inline.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "oops/typeArrayOop.inline.hpp"
49 #include "prims/methodHandles.hpp"
50 #include "runtime/deoptimization.hpp"
51 #include "runtime/fieldDescriptor.inline.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "runtime/interfaceSupport.inline.hpp"
54 #include "runtime/javaCalls.hpp"
55 #include "runtime/jniHandles.inline.hpp"
56 #include "runtime/timerTrace.hpp"
57 #include "runtime/reflection.hpp"
58 #include "runtime/reflectionUtils.hpp"
59 #include "runtime/safepointVerifiers.hpp"
60 #include "runtime/signature.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "sanitizers/leak.hpp"
63 #include "utilities/exceptions.hpp"
64
65
66 /*
67 * JSR 292 reference implementation: method handles
68 * The JDK 7 reference implementation represented method handle
69 * combinations as chains. Each link in the chain had a "vmentry"
70 * field which pointed at a bit of assembly code which performed
71 * one transformation before dispatching to the next link in the chain.
72 *
73 * The current reference implementation pushes almost all code generation
74 * responsibility to (trusted) Java code. A method handle contains a
75 * pointer to its "LambdaForm", which embodies all details of the method
76 * handle's behavior. The LambdaForm is a normal Java object, managed
77 * by a runtime coded in Java.
78 */
79
80 bool MethodHandles::_enabled = false; // set true after successful native linkage
81 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = nullptr;
82
83 /**
84 * Generates method handle adapters. Returns 'false' if memory allocation
85 * failed and true otherwise.
86 */
87 void MethodHandles::generate_adapters() {
88 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
89 assert(_adapter_code == nullptr, "generate only once");
90
91 ResourceMark rm;
92 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
93 // The adapter entry is required to be aligned to CodeEntryAlignment.
94 // So we need additional bytes due to alignment.
95 int adapter_num = (int)Interpreter::method_handle_invoke_LAST - (int)Interpreter::method_handle_invoke_FIRST + 1;
96 int max_aligned_bytes = adapter_num * CodeEntryAlignment;
97 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size + max_aligned_bytes);
98 CodeBuffer code(_adapter_code);
99 MethodHandlesAdapterGenerator g(&code);
100 g.generate();
101 code.log_section_sizes("MethodHandlesAdapterBlob");
102 }
103
104 //------------------------------------------------------------------------------
105 // MethodHandlesAdapterGenerator::generate
106 //
107 void MethodHandlesAdapterGenerator::generate() {
108 // Generate generic method handle adapters.
109 // Generate interpreter entries
110 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
111 mk <= Interpreter::method_handle_invoke_LAST;
112 mk = Interpreter::MethodKind(1 + (int)mk)) {
113 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
114 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
115 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
116 if (entry != nullptr) {
117 Interpreter::set_entry_for_kind(mk, entry);
118 }
119 // If the entry is not set, it will throw AbstractMethodError.
120 }
121 }
122
123 void MethodHandles::set_enabled(bool z) {
124 if (_enabled != z) {
125 guarantee(z, "can only enable once");
126 _enabled = z;
127 }
128 }
129
130 // MemberName support
131
132 // import java_lang_invoke_MemberName.*
133 enum {
134 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
135 IS_OBJECT_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_OBJECT_CONSTRUCTOR,
136 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
137 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
138 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
139 TRUSTED_FINAL = java_lang_invoke_MemberName::MN_TRUSTED_FINAL,
140 HIDDEN_MEMBER = java_lang_invoke_MemberName::MN_HIDDEN_MEMBER,
141 FLATTENED = java_lang_invoke_MemberName::MN_FLAT_FIELD,
142 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
143 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
144 LM_UNCONDITIONAL = java_lang_invoke_MemberName::MN_UNCONDITIONAL_MODE,
145 LM_MODULE = java_lang_invoke_MemberName::MN_MODULE_MODE,
146 LM_TRUSTED = java_lang_invoke_MemberName::MN_TRUSTED_MODE,
147 ALL_KINDS = IS_METHOD | IS_OBJECT_CONSTRUCTOR | IS_FIELD | IS_TYPE
148 };
149
150 int MethodHandles::ref_kind_to_flags(int ref_kind) {
151 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind);
152 int flags = (ref_kind << REFERENCE_KIND_SHIFT);
153 if (ref_kind_is_field(ref_kind)) {
154 flags |= IS_FIELD;
155 } else if (ref_kind_is_method(ref_kind)) {
156 flags |= IS_METHOD;
157 } else if (ref_kind == JVM_REF_newInvokeSpecial) {
158 flags |= IS_OBJECT_CONSTRUCTOR;
159 }
160 return flags;
161 }
162
163 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) {
164 Handle empty;
165 Handle type(THREAD, java_lang_invoke_MemberName::type(mname()));
166 if (!java_lang_String::is_instance(type())) {
167 return type; // already resolved
168 }
169 Symbol* signature = java_lang_String::as_symbol_or_null(type());
170 if (signature == nullptr) {
171 return empty; // no such signature exists in the VM
172 }
173 Handle resolved;
174 int flags = java_lang_invoke_MemberName::flags(mname());
175 switch (flags & ALL_KINDS) {
176 case IS_METHOD:
177 case IS_OBJECT_CONSTRUCTOR:
178 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
179 break;
180 case IS_FIELD:
181 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
182 break;
183 default:
184 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
185 }
186 if (resolved.is_null()) {
187 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
188 }
189 return resolved;
190 }
191
192 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
193 // This method is used from java.lang.invoke.MemberName constructors.
194 // It fills in the new MemberName from a java.lang.reflect.Member.
195 oop target_oop = target();
196 Klass* target_klass = target_oop->klass();
197 if (target_klass == vmClasses::reflect_Field_klass()) {
198 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
199 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
200 Klass* k = java_lang_Class::as_Klass(clazz);
201 if (k != nullptr && k->is_instance_klass()) {
202 fieldDescriptor fd(InstanceKlass::cast(k), slot);
203 oop mname2 = init_field_MemberName(mname, fd);
204 if (mname2 != nullptr) {
205 // Since we have the reified name and type handy, add them to the result.
206 if (java_lang_invoke_MemberName::name(mname2) == nullptr)
207 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
208 if (java_lang_invoke_MemberName::type(mname2) == nullptr)
209 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
210 }
211 return mname2;
212 }
213 } else if (target_klass == vmClasses::reflect_Method_klass()) {
214 oop clazz = java_lang_reflect_Method::clazz(target_oop);
215 int slot = java_lang_reflect_Method::slot(target_oop);
216 Klass* k = java_lang_Class::as_Klass(clazz);
217 if (k != nullptr && k->is_instance_klass()) {
218 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
219 if (m == nullptr || is_signature_polymorphic(m->intrinsic_id()))
220 return nullptr; // do not resolve unless there is a concrete signature
221 CallInfo info(m, k, CHECK_NULL);
222 return init_method_MemberName(mname, info);
223 }
224 } else if (target_klass == vmClasses::reflect_Constructor_klass()) {
225 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
226 int slot = java_lang_reflect_Constructor::slot(target_oop);
227 Klass* k = java_lang_Class::as_Klass(clazz);
228 if (k != nullptr && k->is_instance_klass()) {
229 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
230 if (m == nullptr) return nullptr;
231 CallInfo info(m, k, CHECK_NULL);
232 return init_method_MemberName(mname, info);
233 }
234 }
235 return nullptr;
236 }
237
238 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
239 assert(info.resolved_appendix().is_null(), "only normal methods here");
240 methodHandle m(Thread::current(), info.resolved_method());
241 assert(m.not_null(), "null method handle");
242 InstanceKlass* m_klass = m->method_holder();
243 assert(m_klass != nullptr, "null holder for method handle");
244 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
245 int vmindex = Method::invalid_vtable_index;
246 LogTarget(Debug, methodhandles, indy) lt_indy;
247
248 switch (info.call_kind()) {
249 case CallInfo::itable_call:
250 vmindex = info.itable_index();
251 // More importantly, the itable index only works with the method holder.
252 assert(m_klass->verify_itable_index(vmindex), "");
253 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
254 if (lt_indy.is_enabled()) {
255 ResourceMark rm;
256 LogStream ls(lt_indy);
257 ls.print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
258 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
259 vmindex);
260 m->access_flags().print_on(&ls);
261 if (!m->is_abstract()) {
262 if (!m->is_private()) {
263 ls.print("default");
264 }
265 else {
266 ls.print("private-intf");
267 }
268 }
269 ls.cr();
270 }
271 break;
272
273 case CallInfo::vtable_call:
274 vmindex = info.vtable_index();
275 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
276 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
277 if (m_klass->is_interface()) {
278 // This is a vtable call to an interface method (abstract "miranda method" or default method).
279 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
280 // (LinkResolver should help us figure this out.)
281 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass");
282 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass());
283 if (m_klass_non_interface->is_interface()) {
284 m_klass_non_interface = vmClasses::Object_klass();
285 #ifdef ASSERT
286 { ResourceMark rm;
287 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
288 assert(m->name() == m2->name() && m->signature() == m2->signature(),
289 "at %d, %s != %s", vmindex,
290 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
291 }
292 #endif //ASSERT
293 }
294 if (!m->is_public()) {
295 assert(m->is_public(), "virtual call must be to public interface method");
296 return nullptr; // elicit an error later in product build
297 }
298 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
299 m_klass = m_klass_non_interface;
300 }
301 if (lt_indy.is_enabled()) {
302 ResourceMark rm;
303 LogStream ls(lt_indy);
304 ls.print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
305 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
306 m_klass->internal_name(), vmindex);
307 m->access_flags().print_on(&ls);
308 if (m->is_default_method()) {
309 ls.print("default");
310 }
311 ls.cr();
312 }
313 break;
314
315 case CallInfo::direct_call:
316 vmindex = Method::nonvirtual_vtable_index;
317 if (m->is_static()) {
318 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
319 } else if (m->is_object_constructor()) {
320 flags |= IS_OBJECT_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
321 } else {
322 // "special" reflects that this is a direct call, not that it
323 // necessarily originates from an invokespecial. We can also do
324 // direct calls for private and/or final non-static methods.
325 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
326 }
327 break;
328
329 default: assert(false, "bad CallInfo"); return nullptr;
330 }
331
332 // @CallerSensitive annotation detected
333 if (m->caller_sensitive()) {
334 flags |= CALLER_SENSITIVE;
335 }
336
337 Handle resolved_method = info.resolved_method_name();
338 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(),
339 "Should not change after link resolution");
340
341 oop mname_oop = mname();
342 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
343 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
344 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
345 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
346 // Note: name and type can be lazily computed by resolve_MemberName,
347 // if Java code needs them as resolved String and MethodType objects.
348 // If relevant, the vtable or itable value is stored as vmindex.
349 // This is done eagerly, since it is readily available without
350 // constructing any new objects.
351 return mname();
352 }
353
354 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
355 InstanceKlass* ik = fd.field_holder();
356 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
357 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
358 if (fd.is_trusted_final()) flags |= TRUSTED_FINAL;
359 if (fd.is_flat()) flags |= FLATTENED;;
360 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
361 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
362
363 oop mname_oop = mname();
364 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
365 java_lang_invoke_MemberName::set_method (mname_oop, nullptr);
366 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
367 java_lang_invoke_MemberName::set_clazz (mname_oop, ik->java_mirror());
368
369 oop type = field_signature_type_or_null(fd.signature());
370 oop name = field_name_or_null(fd.name());
371 if (name != nullptr)
372 java_lang_invoke_MemberName::set_name(mname_oop, name);
373 if (type != nullptr)
374 java_lang_invoke_MemberName::set_type(mname_oop, type);
375 // Note: name and type can be lazily computed by resolve_MemberName,
376 // if Java code needs them as resolved String and Class objects.
377 // Note that the incoming type oop might be pre-resolved (non-null).
378 // The base clazz and field offset (vmindex) must be eagerly stored,
379 // because they unambiguously identify the field.
380 // Although the fieldDescriptor::_index would also identify the field,
381 // we do not use it, because it is harder to decode.
382 // TO DO: maybe intern mname_oop
383 return mname();
384 }
385
386 // JVM 2.9 Special Methods:
387 // A method is signature polymorphic if and only if all of the following conditions hold :
388 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
389 // * It has a single formal parameter of type Object[].
390 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
391 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
392 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
393 if (klass == nullptr)
394 return false;
395 // The following test will fail spuriously during bootstrap of MethodHandle itself:
396 // if (klass != vmClasses::MethodHandle_klass())
397 // Test the name instead:
398 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
399 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
400 return false;
401 }
402
403 // Look up signature polymorphic method with polymorphic return type
404 Symbol* poly_sig = vmSymbols::object_array_object_signature();
405 InstanceKlass* iklass = InstanceKlass::cast(klass);
406 Method* m = iklass->find_method(name, poly_sig);
407 if (m != nullptr) {
408 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
409 int flags = m->access_flags().as_int();
410 if ((flags & required) == required) {
411 return true;
412 }
413 }
414
415 // Look up signature polymorphic method with non-polymorphic (non Object) return type
416 int me;
417 int ms = iklass->find_method_by_name(name, &me);
418 if (ms == -1) return false;
419 for (; ms < me; ms++) {
420 Method* m = iklass->methods()->at(ms);
421 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
422 int flags = m->access_flags().as_int();
423 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
424 return true;
425 }
426 }
427 return false;
428 }
429
430
431 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
432 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
433 switch (iid) {
434 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
435 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
436 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
437 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
438 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
439 case vmIntrinsics::_linkToNative: return vmSymbols::linkToNative_name();
440 default:
441 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
442 return 0;
443 }
444 }
445
446 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
447 switch(id) {
448 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
449 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
450 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
451 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
452 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
453 default:
454 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
455 return Bytecodes::_illegal;
456 }
457 }
458
459 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
460 switch (iid) {
461 case vmIntrinsics::_invokeBasic: return 0;
462 case vmIntrinsics::_linkToNative: return 0;
463 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
464 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
465 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
466 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
467 default:
468 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
469 return 0;
470 }
471 }
472
473 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
474 vmSymbolID name_id = vmSymbols::find_sid(name);
475 switch (name_id) {
476 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
477 case VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
478 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
479 case VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
480
481 // There is one static signature-polymorphic method for each JVM invocation mode.
482 case VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
483 case VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
484 case VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
485 case VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
486 case VM_SYMBOL_ENUM_NAME(linkToNative_name): return vmIntrinsics::_linkToNative;
487 default: break;
488 }
489
490 // Cover the case of invokeExact and any future variants of invokeFoo.
491 Klass* mh_klass = vmClasses::klass_at(VM_CLASS_ID(MethodHandle_klass));
492 if (mh_klass != nullptr && is_method_handle_invoke_name(mh_klass, name)) {
493 return vmIntrinsics::_invokeGeneric;
494 }
495
496 // Cover the case of methods on VarHandle.
497 Klass* vh_klass = vmClasses::klass_at(VM_CLASS_ID(VarHandle_klass));
498 if (vh_klass != nullptr && is_method_handle_invoke_name(vh_klass, name)) {
499 return vmIntrinsics::_invokeGeneric;
500 }
501
502 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
503 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
504 return vmIntrinsics::_none;
505 }
506
507 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
508 if (klass != nullptr &&
509 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
510 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
511 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
512 if (iid != vmIntrinsics::_none)
513 return iid;
514 if (is_method_handle_invoke_name(klass, name))
515 return vmIntrinsics::_invokeGeneric;
516 }
517 return vmIntrinsics::_none;
518 }
519
520 // Returns true if method is signature polymorphic and public
521 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
522 if (is_signature_polymorphic_name(klass, name)) {
523 InstanceKlass* iklass = InstanceKlass::cast(klass);
524 int me;
525 int ms = iklass->find_method_by_name(name, &me);
526 assert(ms != -1, "");
527 for (; ms < me; ms++) {
528 Method* m = iklass->methods()->at(ms);
529 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
530 int flags = m->access_flags().as_int();
531 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
532 return true;
533 }
534 }
535 }
536 return false;
537 }
538
539 // convert the external string or reflective type to an internal signature
540 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
541 if (java_lang_invoke_MethodType::is_instance(type_str)) {
542 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
543 } else if (java_lang_Class::is_instance(type_str)) {
544 return java_lang_Class::as_signature(type_str, false);
545 } else if (java_lang_String::is_instance(type_str)) {
546 if (intern_if_not_found) {
547 return java_lang_String::as_symbol(type_str);
548 } else {
549 return java_lang_String::as_symbol_or_null(type_str);
550 }
551 } else {
552 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", nullptr);
553 }
554 }
555
556 static const char OBJ_SIG[] = "Ljava/lang/Object;";
557 enum { OBJ_SIG_LEN = 18 };
558
559 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
560 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
561 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
562 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) {
563 switch (ss.type()) {
564 case T_OBJECT:
565 // only java/lang/Object is valid here
566 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, OBJ_SIG_LEN) != 0)
567 return false;
568 break;
569 case T_VOID:
570 case T_INT:
571 case T_LONG:
572 case T_FLOAT:
573 case T_DOUBLE:
574 break;
575 default:
576 // subword types (T_BYTE etc.), Q-descriptors, arrays
577 return false;
578 }
579 }
580 return true;
581 }
582
583 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg) {
584 Symbol* bsig = nullptr;
585 if (sig == nullptr) {
586 return sig;
587 } else if (is_basic_type_signature(sig)) {
588 sig->increment_refcount();
589 return sig; // that was easy
590 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) {
591 BasicType bt = Signature::basic_type(sig);
592 if (is_subword_type(bt)) {
593 bsig = vmSymbols::int_signature();
594 } else {
595 assert(is_reference_type(bt), "is_basic_type_signature was false");
596 bsig = vmSymbols::object_signature();
597 }
598 } else {
599 ResourceMark rm;
600 stringStream buffer(128);
601 buffer.put(JVM_SIGNATURE_FUNC);
602 int arg_pos = 0, keep_arg_pos = -1;
603 if (keep_last_arg)
604 keep_arg_pos = ArgumentCount(sig).size() - 1;
605 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
606 BasicType bt = ss.type();
607 size_t this_arg_pos = buffer.size();
608 if (ss.at_return_type()) {
609 buffer.put(JVM_SIGNATURE_ENDFUNC);
610 }
611 if (arg_pos == keep_arg_pos) {
612 buffer.write((char*) ss.raw_bytes(),
613 (int) ss.raw_length());
614 } else if (is_reference_type(bt)) {
615 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
616 } else {
617 if (is_subword_type(bt))
618 bt = T_INT;
619 buffer.put(type2char(bt));
620 }
621 arg_pos++;
622 }
623 const char* sigstr = buffer.base();
624 int siglen = (int) buffer.size();
625 bsig = SymbolTable::new_symbol(sigstr, siglen);
626 }
627 assert(is_basic_type_signature(bsig) ||
628 // detune assert in case the injected argument is not a basic type:
629 keep_last_arg, "");
630 return bsig;
631 }
632
633 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
634 Symbol* sig) {
635 st = st ? st : tty;
636 bool prev_type = false;
637 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC);
638 if (is_method) st->put(JVM_SIGNATURE_FUNC);
639 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
640 if (ss.at_return_type())
641 st->put(JVM_SIGNATURE_ENDFUNC);
642 else if (prev_type)
643 st->put(',');
644 const char* cp = (const char*) ss.raw_bytes();
645 if (ss.is_array()) {
646 st->put(JVM_SIGNATURE_ARRAY);
647 if (ss.array_prefix_length() == 1)
648 st->put(cp[1]);
649 else
650 st->put(JVM_SIGNATURE_CLASS);
651 } else {
652 st->put(cp[0]);
653 }
654 }
655 }
656
657
658
659 static oop object_java_mirror() {
660 return vmClasses::Object_klass()->java_mirror();
661 }
662
663 oop MethodHandles::field_name_or_null(Symbol* s) {
664 if (s == nullptr) return nullptr;
665 return StringTable::lookup(s);
666 }
667
668 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
669 if (s == nullptr) return nullptr;
670 BasicType bt = Signature::basic_type(s);
671 if (is_java_primitive(bt)) {
672 assert(s->utf8_length() == 1, "");
673 return java_lang_Class::primitive_mirror(bt);
674 }
675 // Here are some more short cuts for common types.
676 // They are optional, since reference types can be resolved lazily.
677 if (bt == T_OBJECT) {
678 if (s == vmSymbols::object_signature()) {
679 return object_java_mirror();
680 } else if (s == vmSymbols::class_signature()) {
681 return vmClasses::Class_klass()->java_mirror();
682 } else if (s == vmSymbols::string_signature()) {
683 return vmClasses::String_klass()->java_mirror();
684 }
685 }
686 return nullptr;
687 }
688
689 // An unresolved member name is a mere symbolic reference.
690 // Resolving it plants a vmtarget/vmindex in it,
691 // which refers directly to JVM internals.
692 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, int lookup_mode,
693 bool speculative_resolve, TRAPS) {
694 Handle empty;
695 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
696
697 if (java_lang_invoke_MemberName::vmtarget(mname()) != nullptr) {
698 // Already resolved.
699 DEBUG_ONLY(intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()));
700 assert(vmindex >= Method::nonvirtual_vtable_index, "");
701 return mname;
702 }
703
704 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
705 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
706 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
707 int flags = java_lang_invoke_MemberName::flags(mname());
708 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
709 if (!ref_kind_is_valid(ref_kind)) {
710 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
711 }
712
713 DEBUG_ONLY(intptr_t old_vmindex);
714 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
715
716 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
717 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
718 }
719
720 InstanceKlass* defc = nullptr;
721 {
722 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
723 if (defc_klass == nullptr) return empty; // a primitive; no resolution possible
724 if (!defc_klass->is_instance_klass()) {
725 if (!defc_klass->is_array_klass()) return empty;
726 defc_klass = vmClasses::Object_klass();
727 }
728 defc = InstanceKlass::cast(defc_klass);
729 }
730 if (defc == nullptr) {
731 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
732 }
733 defc->link_class(CHECK_(empty)); // possible safepoint
734
735 // convert the external string name to an internal symbol
736 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
737 if (name == nullptr) return empty; // no such name
738 if (name == vmSymbols::class_initializer_name())
739 return empty; // illegal name
740
741 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
742 if ((flags & ALL_KINDS) == IS_METHOD &&
743 (defc == vmClasses::MethodHandle_klass() || defc == vmClasses::VarHandle_klass()) &&
744 (ref_kind == JVM_REF_invokeVirtual ||
745 ref_kind == JVM_REF_invokeSpecial ||
746 // static invocation mode is required for _linkToVirtual, etc.:
747 ref_kind == JVM_REF_invokeStatic)) {
748 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
749 if (iid != vmIntrinsics::_none &&
750 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
751 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
752 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
753 mh_invoke_id = iid;
754 }
755 }
756
757 // convert the external string or reflective type to an internal signature
758 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
759 if (type == nullptr) return empty; // no such signature exists in the VM
760
761 // skip access check if it's trusted lookup
762 LinkInfo::AccessCheck access_check = caller != nullptr ?
763 LinkInfo::AccessCheck::required :
764 LinkInfo::AccessCheck::skip;
765 // skip loader constraints if it's trusted lookup or a public lookup
766 LinkInfo::LoaderConstraintCheck loader_constraint_check = (caller != nullptr && (lookup_mode & LM_UNCONDITIONAL) == 0) ?
767 LinkInfo::LoaderConstraintCheck::required :
768 LinkInfo::LoaderConstraintCheck::skip;
769
770 // Time to do the lookup.
771 switch (flags & ALL_KINDS) {
772 case IS_METHOD:
773 {
774 CallInfo result;
775 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
776 {
777 assert(!HAS_PENDING_EXCEPTION, "");
778 if (ref_kind == JVM_REF_invokeStatic) {
779 LinkResolver::resolve_static_call(result,
780 link_info, false, THREAD);
781 } else if (ref_kind == JVM_REF_invokeInterface) {
782 LinkResolver::resolve_interface_call(result, Handle(), defc,
783 link_info, false, THREAD);
784 } else if (mh_invoke_id != vmIntrinsics::_none) {
785 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
786 LinkResolver::resolve_handle_call(result, link_info, THREAD);
787 } else if (ref_kind == JVM_REF_invokeSpecial) {
788 LinkResolver::resolve_special_call(result, Handle(),
789 link_info, THREAD);
790 } else if (ref_kind == JVM_REF_invokeVirtual) {
791 LinkResolver::resolve_virtual_call(result, Handle(), defc,
792 link_info, false, THREAD);
793 } else {
794 assert(false, "ref_kind=%d", ref_kind);
795 }
796 if (HAS_PENDING_EXCEPTION) {
797 if (speculative_resolve) {
798 CLEAR_PENDING_EXCEPTION;
799 }
800 return empty;
801 }
802 }
803 if (result.resolved_appendix().not_null()) {
804 // The resolved MemberName must not be accompanied by an appendix argument,
805 // since there is no way to bind this value into the MemberName.
806 // Caller is responsible to prevent this from happening.
807 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
808 }
809 result.set_resolved_method_name(CHECK_(empty));
810 oop mname2 = init_method_MemberName(mname, result);
811 return Handle(THREAD, mname2);
812 }
813 case IS_OBJECT_CONSTRUCTOR:
814 {
815 CallInfo result;
816 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
817 {
818 assert(!HAS_PENDING_EXCEPTION, "");
819 if (name == vmSymbols::object_initializer_name() && type->is_void_method_signature()) {
820 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
821 } else if (name == vmSymbols::inline_factory_name()) {
822 LinkResolver::resolve_static_call(result, link_info, false, THREAD);
823 } else {
824 break; // will throw after end of switch
825 }
826 if (HAS_PENDING_EXCEPTION) {
827 if (speculative_resolve) {
828 CLEAR_PENDING_EXCEPTION;
829 }
830 return empty;
831 }
832 }
833 assert(result.is_statically_bound(), "");
834 result.set_resolved_method_name(CHECK_(empty));
835 oop mname2 = init_method_MemberName(mname, result);
836 return Handle(THREAD, mname2);
837 }
838 case IS_FIELD:
839 {
840 fieldDescriptor result; // find_field initializes fd if found
841 {
842 assert(!HAS_PENDING_EXCEPTION, "");
843 LinkInfo link_info(defc, name, type, caller, LinkInfo::AccessCheck::skip, loader_constraint_check);
844 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
845 if (HAS_PENDING_EXCEPTION) {
846 if (speculative_resolve) {
847 CLEAR_PENDING_EXCEPTION;
848 }
849 return empty;
850 }
851 }
852 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
853 return Handle(THREAD, mname2);
854 }
855 default:
856 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
857 }
858
859 return empty;
860 }
861
862 // Conversely, a member name which is only initialized from JVM internals
863 // may have null defc, name, and type fields.
864 // Resolving it plants a vmtarget/vmindex in it,
865 // which refers directly to JVM internals.
866 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
867 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
868
869 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != nullptr);
870 bool have_name = (java_lang_invoke_MemberName::name(mname()) != nullptr);
871 bool have_type = (java_lang_invoke_MemberName::type(mname()) != nullptr);
872 int flags = java_lang_invoke_MemberName::flags(mname());
873
874 if (suppress != 0) {
875 if (suppress & _suppress_defc) have_defc = true;
876 if (suppress & _suppress_name) have_name = true;
877 if (suppress & _suppress_type) have_type = true;
878 }
879
880 if (have_defc && have_name && have_type) return; // nothing needed
881
882 switch (flags & ALL_KINDS) {
883 case IS_METHOD:
884 case IS_OBJECT_CONSTRUCTOR:
885 {
886 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
887 if (vmtarget == nullptr) {
888 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
889 }
890 methodHandle m(THREAD, vmtarget);
891 DEBUG_ONLY(vmtarget = nullptr); // safety
892 if (!have_defc) {
893 InstanceKlass* defc = m->method_holder();
894 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
895 }
896 if (!have_name) {
897 //not java_lang_String::create_from_symbol; let's intern member names
898 oop name = StringTable::intern(m->name(), CHECK);
899 java_lang_invoke_MemberName::set_name(mname(), name);
900 }
901 if (!have_type) {
902 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
903 java_lang_invoke_MemberName::set_type(mname(), type());
904 }
905 return;
906 }
907 case IS_FIELD:
908 {
909 oop clazz = java_lang_invoke_MemberName::clazz(mname());
910 if (clazz == nullptr) {
911 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
912 }
913 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
914 DEBUG_ONLY(clazz = nullptr); // safety
915 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
916 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
917 fieldDescriptor fd; // find_field initializes fd if found
918 if (!defc->find_field_from_offset(checked_cast<int>(vmindex), is_static, &fd))
919 break; // cannot expand
920 if (!have_name) {
921 //not java_lang_String::create_from_symbol; let's intern member names
922 oop name = StringTable::intern(fd.name(), CHECK);
923 java_lang_invoke_MemberName::set_name(mname(), name);
924 }
925 if (!have_type) {
926 // If it is a primitive field type, don't mess with short strings like "I".
927 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
928 if (type.is_null()) {
929 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
930 }
931 java_lang_invoke_MemberName::set_type(mname(), type());
932 }
933 return;
934 }
935 }
936 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
937 }
938
939 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
940 assert_locked_or_safepoint(CodeCache_lock);
941
942 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
943 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
944 // Try to purge stale entries on updates.
945 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
946 // in order to avoid memory leak, stale entries are purged whenever a dependency list
947 // is changed (both on addition and removal). Though memory reclamation is delayed,
948 // it avoids indefinite memory usage growth.
949 deps.add_dependent_nmethod(nm);
950 }
951
952 void MethodHandles::clean_dependency_context(oop call_site) {
953 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
954 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
955 deps.clean_unloading_dependents();
956 }
957
958 void MethodHandles::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, Handle call_site, Handle target) {
959 assert_lock_strong(Compile_lock);
960
961 CallSiteDepChange changes(call_site, target);
962 {
963 NoSafepointVerifier nsv;
964 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
965
966 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site());
967 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
968 deps.mark_dependent_nmethods(deopt_scope, changes);
969 }
970 }
971
972 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
973 if (log_is_enabled(Info, methodhandles)) {
974 const char* name = vmIntrinsics::name_at(iid);
975 if (*name == '_') name += 1;
976 const size_t len = strlen(name) + 50;
977 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
978 const char* suffix = "";
979 if (is_signature_polymorphic(iid)) {
980 if (is_signature_polymorphic_static(iid))
981 suffix = "/static";
982 else
983 suffix = "/private";
984 }
985 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
986 trace_method_handle(_masm, qname);
987 // LSan appears unable to keep track of qname, ignore it.
988 LSAN_IGNORE_OBJECT(qname);
989 // Note: Don't free the allocated char array because it's used
990 // during runtime.
991 }
992 }
993
994 //
995 // Here are the native methods in java.lang.invoke.MethodHandleNatives
996 // They are the private interface between this JVM and the HotSpot-specific
997 // Java code that implements JSR 292 method handles.
998 //
999 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1000 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1001 //
1002
1003 #ifndef PRODUCT
1004 #define EACH_NAMED_CON(template, requirement) \
1005 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1006 template(java_lang_invoke_MemberName,MN_IS_OBJECT_CONSTRUCTOR) \
1007 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1008 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1009 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1010 template(java_lang_invoke_MemberName,MN_TRUSTED_FINAL) \
1011 template(java_lang_invoke_MemberName,MN_HIDDEN_MEMBER) \
1012 template(java_lang_invoke_MemberName,MN_FLAT_FIELD) \
1013 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1014 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1015 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \
1016 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \
1017 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \
1018 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \
1019 template(java_lang_invoke_MemberName,MN_MODULE_MODE) \
1020 template(java_lang_invoke_MemberName,MN_UNCONDITIONAL_MODE) \
1021 template(java_lang_invoke_MemberName,MN_TRUSTED_MODE) \
1022 /*end*/
1023
1024 #define IGNORE_REQ(req_expr) /* req_expr */
1025 #define ONE_PLUS(scope,value) 1+
1026 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1027 #define VALUE_COMMA(scope,value) scope::value,
1028 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1029 #define STRING_NULL(scope,value) #value "\0"
1030 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1031
1032 static bool advertise_con_value(int which) {
1033 if (which < 0) return false;
1034 bool ok = true;
1035 int count = 0;
1036 #define INC_COUNT(scope,value) \
1037 ++count;
1038 #define CHECK_REQ(req_expr) \
1039 if (which < count) return ok; \
1040 ok = (req_expr);
1041 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1042 #undef INC_COUNT
1043 #undef CHECK_REQ
1044 assert(count == con_value_count, "");
1045 if (which < count) return ok;
1046 return false;
1047 }
1048
1049 #undef ONE_PLUS
1050 #undef VALUE_COMMA
1051 #undef STRING_NULL
1052 #undef EACH_NAMED_CON
1053 #endif // PRODUCT
1054
1055 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1056 #ifndef PRODUCT
1057 if (advertise_con_value(which)) {
1058 assert(which >= 0 && which < con_value_count, "");
1059 int con = con_values[which];
1060 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1061 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1062 const char* str = &con_names[0];
1063 for (int i = 0; i < which; i++)
1064 str += strlen(str) + 1; // skip name and null
1065 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1066 box->obj_at_put(0, name);
1067 }
1068 return con;
1069 }
1070 #endif
1071 return 0;
1072 }
1073 JVM_END
1074
1075 // void init(MemberName self, AccessibleObject ref)
1076 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1077 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1078 if (target_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1079 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1080 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1081 MethodHandles::init_MemberName(mname, target, CHECK);
1082 }
1083 JVM_END
1084
1085 // void expand(MemberName self)
1086 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1087 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1088 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1089 MethodHandles::expand_MemberName(mname, 0, CHECK);
1090 }
1091 JVM_END
1092
1093 // void resolve(MemberName self, Class<?> caller)
1094 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1095 jint lookup_mode, jboolean speculative_resolve)) {
1096 if (mname_jh == nullptr) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1097 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1098
1099 // The trusted Java code that calls this method should already have performed
1100 // access checks on behalf of the given caller. But, we can verify this.
1101 // This only verifies from the context of the lookup class. It does not
1102 // verify the lookup context for a Lookup object teleported from one module
1103 // to another. Such Lookup object can only access the intersection of the set
1104 // of accessible classes from both lookup class and previous lookup class.
1105 if (VerifyMethodHandles && (lookup_mode & LM_TRUSTED) == LM_TRUSTED && caller_jh != nullptr &&
1106 java_lang_invoke_MemberName::clazz(mname()) != nullptr) {
1107 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1108 if (reference_klass != nullptr && reference_klass->is_objArray_klass()) {
1109 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1110 }
1111
1112 // Reflection::verify_class_access can only handle instance classes.
1113 if (reference_klass != nullptr && reference_klass->is_instance_klass()) {
1114 // Emulate LinkResolver::check_klass_accessability.
1115 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1116 // access check on behalf of the caller if this is not a public lookup
1117 // i.e. lookup mode is not UNCONDITIONAL
1118 if ((lookup_mode & LM_UNCONDITIONAL) == 0
1119 && Reflection::verify_class_access(caller,
1120 InstanceKlass::cast(reference_klass),
1121 true) != Reflection::ACCESS_OK) {
1122 ResourceMark rm(THREAD);
1123 stringStream ss;
1124 ss.print("caller %s tried to access %s", caller->class_in_module_of_loader(),
1125 reference_klass->class_in_module_of_loader());
1126 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), ss.as_string());
1127 }
1128 }
1129 }
1130
1131 Klass* caller = caller_jh == nullptr ? nullptr :
1132 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1133 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, lookup_mode,
1134 speculative_resolve == JNI_TRUE,
1135 CHECK_NULL);
1136
1137 if (resolved.is_null()) {
1138 int flags = java_lang_invoke_MemberName::flags(mname());
1139 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1140 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1141 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1142 }
1143 if (speculative_resolve) {
1144 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1145 return nullptr;
1146 }
1147 if ((flags & ALL_KINDS) == IS_FIELD) {
1148 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1149 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1150 (flags & ALL_KINDS) == IS_OBJECT_CONSTRUCTOR) {
1151 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1152 } else {
1153 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1154 }
1155 }
1156
1157 return JNIHandles::make_local(THREAD, resolved());
1158 }
1159 JVM_END
1160
1161 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1162 if (mname == nullptr ||
1163 java_lang_invoke_MemberName::clazz(mname) == nullptr) {
1164 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1165 } else {
1166 int flags = java_lang_invoke_MemberName::flags(mname);
1167 if ((flags & IS_FIELD) != 0 &&
1168 (must_be_static
1169 ? (flags & JVM_ACC_STATIC) != 0
1170 : (flags & JVM_ACC_STATIC) == 0)) {
1171 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname);
1172 return (jlong) vmindex;
1173 }
1174 }
1175 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1176 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1177 return 0;
1178 }
1179
1180 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1181 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1182 }
1183 JVM_END
1184
1185 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1186 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1187 }
1188 JVM_END
1189
1190 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1191 // use the other function to perform sanity checks:
1192 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1193 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1194 return JNIHandles::make_local(THREAD, clazz);
1195 }
1196 JVM_END
1197
1198 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1199 if (mname_jh == nullptr) return nullptr;
1200 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1201 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1202 objArrayHandle result = oopFactory::new_objArray_handle(vmClasses::Object_klass(), 2, CHECK_NULL);
1203 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1204 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1205 result->obj_at_put(0, x);
1206
1207 int flags = java_lang_invoke_MemberName::flags(mname());
1208 if ((flags & IS_FIELD) != 0) {
1209 x = java_lang_invoke_MemberName::clazz(mname());
1210 } else {
1211 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1212 assert(vmtarget != nullptr && vmtarget->is_method(), "vmtarget is only method");
1213 x = mname();
1214 }
1215 result->obj_at_put(1, x);
1216 return JNIHandles::make_local(THREAD, result());
1217 }
1218 JVM_END
1219
1220 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1221 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1222 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1223 DeoptimizationScope deopt_scope;
1224 {
1225 // Walk all nmethods depending on this call site.
1226 MutexLocker mu(thread, Compile_lock);
1227 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1228 java_lang_invoke_CallSite::set_target(call_site(), target());
1229 // This is assumed to be an 'atomic' operation by verification.
1230 // So keep it under lock for now.
1231 deopt_scope.deoptimize_marked();
1232 }
1233 }
1234 JVM_END
1235
1236 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1237 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1238 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1239 DeoptimizationScope deopt_scope;
1240 {
1241 // Walk all nmethods depending on this call site.
1242 MutexLocker mu(thread, Compile_lock);
1243 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1244 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1245 // This is assumed to be an 'atomic' operation by verification.
1246 // So keep it under lock for now.
1247 deopt_scope.deoptimize_marked();
1248 }
1249 }
1250 JVM_END
1251
1252 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1253 jobject caller_jh, jintArray index_info_jh,
1254 jint start, jint end,
1255 jobjectArray buf_jh, jint pos,
1256 jboolean resolve, jobject ifna_jh)) {
1257 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1258 if (caller_k == nullptr || !caller_k->is_instance_klass()) {
1259 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1260 }
1261 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1262 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1263 if (index_info_oop == nullptr ||
1264 index_info_oop->klass() != Universe::intArrayKlassObj() ||
1265 typeArrayOop(index_info_oop)->length() < 2) {
1266 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1267 }
1268 typeArrayHandle index_info(THREAD, index_info_oop);
1269 int bss_index_in_pool = index_info->int_at(1);
1270 // While we are here, take a quick look at the index info:
1271 if (bss_index_in_pool <= 0 ||
1272 bss_index_in_pool >= caller->constants()->length() ||
1273 index_info->int_at(0)
1274 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1275 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1276 }
1277 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1278 if (start < 0) {
1279 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1280 if (start == pseudo_index) {
1281 if (start >= end || 0 > pos || pos >= buf->length()) break;
1282 oop pseudo_arg = nullptr;
1283 switch (pseudo_index) {
1284 case -4: // bootstrap method
1285 {
1286 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool);
1287 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1288 break;
1289 }
1290 case -3: // name
1291 {
1292 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic);
1293 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1294 pseudo_arg = str();
1295 break;
1296 }
1297 case -2: // type
1298 {
1299 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic);
1300 Handle th;
1301 if (type->char_at(0) == JVM_SIGNATURE_FUNC) {
1302 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1303 } else {
1304 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1305 }
1306 pseudo_arg = th();
1307 break;
1308 }
1309 case -1: // argument count
1310 {
1311 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool);
1312 jvalue argc_value; argc_value.i = (jint)argc;
1313 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1314 break;
1315 }
1316 }
1317
1318 // Store the pseudo-argument, and advance the pointers.
1319 buf->obj_at_put(pos++, pseudo_arg);
1320 ++start;
1321 }
1322 }
1323 // When we are done with this there may be regular arguments to process too.
1324 }
1325 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1326 caller->constants()->
1327 copy_bootstrap_arguments_at(bss_index_in_pool,
1328 start, end, buf, pos,
1329 (resolve == JNI_TRUE), ifna, CHECK);
1330 }
1331 JVM_END
1332
1333 // It is called by a Cleaner object which ensures that dropped CallSites properly
1334 // deallocate their dependency information.
1335 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1336 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1337 DeoptimizationScope deopt_scope;
1338 {
1339 NoSafepointVerifier nsv;
1340 MutexLocker ml(THREAD, CodeCache_lock, Mutex::_no_safepoint_check_flag);
1341 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1342 deps.remove_and_mark_for_deoptimization_all_dependents(&deopt_scope);
1343 // This is assumed to be an 'atomic' operation by verification.
1344 // So keep it under lock for now.
1345 deopt_scope.deoptimize_marked();
1346 }
1347 }
1348 JVM_END
1349
1350 /**
1351 * Throws a java/lang/UnsupportedOperationException unconditionally.
1352 * This is required by the specification of MethodHandle.invoke if
1353 * invoked directly.
1354 */
1355 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1356 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1357 return nullptr;
1358 }
1359 JVM_END
1360
1361 /**
1362 * Throws a java/lang/UnsupportedOperationException unconditionally.
1363 * This is required by the specification of MethodHandle.invokeExact if
1364 * invoked directly.
1365 */
1366 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1367 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1368 return nullptr;
1369 }
1370 JVM_END
1371
1372 /// JVM_RegisterMethodHandleMethods
1373
1374 #define LANG "Ljava/lang/"
1375 #define JLINV "Ljava/lang/invoke/"
1376
1377 #define OBJ LANG "Object;"
1378 #define CLS LANG "Class;"
1379 #define STRG LANG "String;"
1380 #define CS JLINV "CallSite;"
1381 #define MT JLINV "MethodType;"
1382 #define MH JLINV "MethodHandle;"
1383 #define MEM JLINV "MemberName;"
1384 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1385
1386 #define CC (char*) /*cast a literal from (const char*)*/
1387 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1388
1389 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1390 static JNINativeMethod MHN_methods[] = {
1391 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1392 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1393 {CC "resolve", CC "(" MEM "" CLS "IZ)" MEM, FN_PTR(MHN_resolve_Mem)},
1394 // static native int getNamedCon(int which, Object[] name)
1395 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1396 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1397 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1398 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1399 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1400 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1401 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1402 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1403 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1404 };
1405
1406 static JNINativeMethod MH_methods[] = {
1407 // UnsupportedOperationException throwers
1408 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1409 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1410 };
1411
1412 /**
1413 * This one function is exported, used by NativeLookup.
1414 */
1415 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1416 assert(!MethodHandles::enabled(), "must not be enabled");
1417 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
1418
1419 oop mirror = vmClasses::MethodHandle_klass()->java_mirror();
1420 jclass MH_class = (jclass) JNIHandles::make_local(THREAD, mirror);
1421
1422 {
1423 ThreadToNativeFromVM ttnfv(thread);
1424
1425 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1426 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1427 "register java.lang.invoke.MethodHandleNative natives");
1428
1429 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1430 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1431 "register java.lang.invoke.MethodHandle natives");
1432 }
1433
1434 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1435
1436 MethodHandles::set_enabled(true);
1437 }
1438 JVM_END