1 /*
2 * Copyright (c) 2008, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "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/safepointVerifiers.hpp"
59 #include "runtime/signature.hpp"
60 #include "runtime/stubRoutines.hpp"
61 #include "sanitizers/leak.hpp"
62 #include "utilities/exceptions.hpp"
63
64
65 /*
66 * JSR 292 reference implementation: method handles
67 * The JDK 7 reference implementation represented method handle
68 * combinations as chains. Each link in the chain had a "vmentry"
69 * field which pointed at a bit of assembly code which performed
70 * one transformation before dispatching to the next link in the chain.
71 *
72 * The current reference implementation pushes almost all code generation
73 * responsibility to (trusted) Java code. A method handle contains a
74 * pointer to its "LambdaForm", which embodies all details of the method
75 * handle's behavior. The LambdaForm is a normal Java object, managed
76 * by a runtime coded in Java.
77 */
78
79 bool MethodHandles::_enabled = false; // set true after successful native linkage
80 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = nullptr;
81
82 /**
83 * Generates method handle adapters. Returns 'false' if memory allocation
84 * failed and true otherwise.
85 */
86 void MethodHandles::generate_adapters() {
87 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
88 assert(_adapter_code == nullptr, "generate only once");
89
90 ResourceMark rm;
91 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
92 // The adapter entry is required to be aligned to CodeEntryAlignment.
93 // So we need additional bytes due to alignment.
94 int adapter_num = (int)Interpreter::method_handle_invoke_LAST - (int)Interpreter::method_handle_invoke_FIRST + 1;
95 int max_aligned_bytes = adapter_num * CodeEntryAlignment;
96 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size + max_aligned_bytes);
97 CodeBuffer code(_adapter_code);
98 MethodHandlesAdapterGenerator g(&code);
99 g.generate();
100 code.log_section_sizes("MethodHandlesAdapterBlob");
101 }
102
103 //------------------------------------------------------------------------------
104 // MethodHandlesAdapterGenerator::generate
105 //
106 void MethodHandlesAdapterGenerator::generate() {
107 // Generate generic method handle adapters.
108 // Generate interpreter entries
109 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
110 mk <= Interpreter::method_handle_invoke_LAST;
111 mk = Interpreter::MethodKind(1 + (int)mk)) {
112 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
113 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
114 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
115 if (entry != nullptr) {
116 Interpreter::set_entry_for_kind(mk, entry);
117 }
118 // If the entry is not set, it will throw AbstractMethodError.
119 }
120 }
121
122 void MethodHandles::set_enabled(bool z) {
123 if (_enabled != z) {
124 guarantee(z, "can only enable once");
125 _enabled = z;
126 }
127 }
128
129 // MemberName support
130
131 // import java_lang_invoke_MemberName.*
132 enum {
133 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
134 IS_OBJECT_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_OBJECT_CONSTRUCTOR,
135 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
136 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
137 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
138 TRUSTED_FINAL = java_lang_invoke_MemberName::MN_TRUSTED_FINAL,
139 HIDDEN_MEMBER = java_lang_invoke_MemberName::MN_HIDDEN_MEMBER,
140 FLAT_FIELD = java_lang_invoke_MemberName::MN_FLAT_FIELD,
141 NULL_RESTRICTED = java_lang_invoke_MemberName::MN_NULL_RESTRICTED_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());
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 |= FLAT_FIELD;
360 if (fd.is_null_free_inline_type()) flags |= NULL_RESTRICTED;
361 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
362 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
363
364 oop mname_oop = mname();
365 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
366 java_lang_invoke_MemberName::set_method (mname_oop, nullptr);
367 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
368 java_lang_invoke_MemberName::set_clazz (mname_oop, ik->java_mirror());
369
370 oop type = field_signature_type_or_null(fd.signature());
371 oop name = field_name_or_null(fd.name());
372 if (name != nullptr)
373 java_lang_invoke_MemberName::set_name(mname_oop, name);
374 if (type != nullptr)
375 java_lang_invoke_MemberName::set_type(mname_oop, type);
376 // Note: name and type can be lazily computed by resolve_MemberName,
377 // if Java code needs them as resolved String and Class objects.
378 // Note that the incoming type oop might be pre-resolved (non-null).
379 // The base clazz and field offset (vmindex) must be eagerly stored,
380 // because they unambiguously identify the field.
381 // Although the fieldDescriptor::_index would also identify the field,
382 // we do not use it, because it is harder to decode.
383 // TO DO: maybe intern mname_oop
384 return mname();
385 }
386
387 // JVM 2.9 Special Methods:
388 // A method is signature polymorphic if and only if all of the following conditions hold :
389 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
390 // * It has a single formal parameter of type Object[].
391 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
392 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
393 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
394 if (klass == nullptr)
395 return false;
396 // The following test will fail spuriously during bootstrap of MethodHandle itself:
397 // if (klass != vmClasses::MethodHandle_klass())
398 // Test the name instead:
399 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
400 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
401 return false;
402 }
403
404 // Look up signature polymorphic method with polymorphic return type
405 Symbol* poly_sig = vmSymbols::object_array_object_signature();
406 InstanceKlass* iklass = InstanceKlass::cast(klass);
407 Method* m = iklass->find_method(name, poly_sig);
408 if (m != nullptr) {
409 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
410 int flags = m->access_flags().as_int();
411 if ((flags & required) == required) {
412 return true;
413 }
414 }
415
416 // Look up signature polymorphic method with non-polymorphic (non Object) return type
417 int me;
418 int ms = iklass->find_method_by_name(name, &me);
419 if (ms == -1) return false;
420 for (; ms < me; ms++) {
421 Method* m = iklass->methods()->at(ms);
422 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
423 int flags = m->access_flags().as_int();
424 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
425 return true;
426 }
427 }
428 return false;
429 }
430
431
432 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
433 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
434 switch (iid) {
435 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
436 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
437 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
438 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
439 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
440 case vmIntrinsics::_linkToNative: return vmSymbols::linkToNative_name();
441 default:
442 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
443 return 0;
444 }
445 }
446
447 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
448 switch(id) {
449 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
450 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
451 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
452 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
453 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
454 default:
455 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
456 return Bytecodes::_illegal;
457 }
458 }
459
460 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
461 switch (iid) {
462 case vmIntrinsics::_invokeBasic: return 0;
463 case vmIntrinsics::_linkToNative: return 0;
464 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
465 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
466 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
467 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
468 default:
469 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
470 return 0;
471 }
472 }
473
474 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
475 vmSymbolID name_id = vmSymbols::find_sid(name);
476 switch (name_id) {
477 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
478 case VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
479 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
480 case VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
481
482 // There is one static signature-polymorphic method for each JVM invocation mode.
483 case VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
484 case VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
485 case VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
486 case VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
487 case VM_SYMBOL_ENUM_NAME(linkToNative_name): return vmIntrinsics::_linkToNative;
488 default: break;
489 }
490
491 // Cover the case of invokeExact and any future variants of invokeFoo.
492 Klass* mh_klass = vmClasses::klass_at(VM_CLASS_ID(MethodHandle_klass));
493 if (mh_klass != nullptr && is_method_handle_invoke_name(mh_klass, name)) {
494 return vmIntrinsics::_invokeGeneric;
495 }
496
497 // Cover the case of methods on VarHandle.
498 Klass* vh_klass = vmClasses::klass_at(VM_CLASS_ID(VarHandle_klass));
499 if (vh_klass != nullptr && is_method_handle_invoke_name(vh_klass, name)) {
500 return vmIntrinsics::_invokeGeneric;
501 }
502
503 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
504 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
505 return vmIntrinsics::_none;
506 }
507
508 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
509 if (klass != nullptr &&
510 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
511 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
512 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
513 if (iid != vmIntrinsics::_none)
514 return iid;
515 if (is_method_handle_invoke_name(klass, name))
516 return vmIntrinsics::_invokeGeneric;
517 }
518 return vmIntrinsics::_none;
519 }
520
521 // Returns true if method is signature polymorphic and public
522 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
523 if (is_signature_polymorphic_name(klass, name)) {
524 InstanceKlass* iklass = InstanceKlass::cast(klass);
525 int me;
526 int ms = iklass->find_method_by_name(name, &me);
527 assert(ms != -1, "");
528 for (; ms < me; ms++) {
529 Method* m = iklass->methods()->at(ms);
530 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
531 int flags = m->access_flags().as_int();
532 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
533 return true;
534 }
535 }
536 }
537 return false;
538 }
539
540 // convert the external string or reflective type to an internal signature
541 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
542 if (java_lang_invoke_MethodType::is_instance(type_str)) {
543 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
544 } else if (java_lang_Class::is_instance(type_str)) {
545 return java_lang_Class::as_signature(type_str, false);
546 } else if (java_lang_String::is_instance(type_str)) {
547 if (intern_if_not_found) {
548 return java_lang_String::as_symbol(type_str);
549 } else {
550 return java_lang_String::as_symbol_or_null(type_str);
551 }
552 } else {
553 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", nullptr);
554 }
555 }
556
557 static const char OBJ_SIG[] = "Ljava/lang/Object;";
558 enum { OBJ_SIG_LEN = 18 };
559
560 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
561 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
562 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
563 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) {
564 switch (ss.type()) {
565 case T_OBJECT:
566 // only java/lang/Object is valid here
567 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, OBJ_SIG_LEN) != 0)
568 return false;
569 break;
570 case T_VOID:
571 case T_INT:
572 case T_LONG:
573 case T_FLOAT:
574 case T_DOUBLE:
575 break;
576 default:
577 // subword types (T_BYTE etc.), Q-descriptors, arrays
578 return false;
579 }
580 }
581 return true;
582 }
583
584 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg) {
585 Symbol* bsig = nullptr;
586 if (sig == nullptr) {
587 return sig;
588 } else if (is_basic_type_signature(sig)) {
589 sig->increment_refcount();
590 return sig; // that was easy
591 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) {
592 BasicType bt = Signature::basic_type(sig);
593 if (is_subword_type(bt)) {
594 bsig = vmSymbols::int_signature();
595 } else {
596 assert(is_reference_type(bt), "is_basic_type_signature was false");
597 bsig = vmSymbols::object_signature();
598 }
599 } else {
600 ResourceMark rm;
601 stringStream buffer(128);
602 buffer.put(JVM_SIGNATURE_FUNC);
603 int arg_pos = 0, keep_arg_pos = -1;
604 if (keep_last_arg)
605 keep_arg_pos = ArgumentCount(sig).size() - 1;
606 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
607 BasicType bt = ss.type();
608 size_t this_arg_pos = buffer.size();
609 if (ss.at_return_type()) {
610 buffer.put(JVM_SIGNATURE_ENDFUNC);
611 }
612 if (arg_pos == keep_arg_pos) {
613 buffer.write((char*) ss.raw_bytes(),
614 (int) ss.raw_length());
615 } else if (is_reference_type(bt)) {
616 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
617 } else {
618 if (is_subword_type(bt))
619 bt = T_INT;
620 buffer.put(type2char(bt));
621 }
622 arg_pos++;
623 }
624 const char* sigstr = buffer.base();
625 int siglen = (int) buffer.size();
626 bsig = SymbolTable::new_symbol(sigstr, siglen);
627 }
628 assert(is_basic_type_signature(bsig) ||
629 // detune assert in case the injected argument is not a basic type:
630 keep_last_arg, "");
631 return bsig;
632 }
633
634 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
635 Symbol* sig) {
636 st = st ? st : tty;
637 bool prev_type = false;
638 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC);
639 if (is_method) st->put(JVM_SIGNATURE_FUNC);
640 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
641 if (ss.at_return_type())
642 st->put(JVM_SIGNATURE_ENDFUNC);
643 else if (prev_type)
644 st->put(',');
645 const char* cp = (const char*) ss.raw_bytes();
646 if (ss.is_array()) {
647 st->put(JVM_SIGNATURE_ARRAY);
648 if (ss.array_prefix_length() == 1)
649 st->put(cp[1]);
650 else
651 st->put(JVM_SIGNATURE_CLASS);
652 } else {
653 st->put(cp[0]);
654 }
655 }
656 }
657
658
659
660 static oop object_java_mirror() {
661 return vmClasses::Object_klass()->java_mirror();
662 }
663
664 oop MethodHandles::field_name_or_null(Symbol* s) {
665 if (s == nullptr) return nullptr;
666 return StringTable::lookup(s);
667 }
668
669 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
670 if (s == nullptr) return nullptr;
671 BasicType bt = Signature::basic_type(s);
672 if (is_java_primitive(bt)) {
673 assert(s->utf8_length() == 1, "");
674 return java_lang_Class::primitive_mirror(bt);
675 }
676 // Here are some more short cuts for common types.
677 // They are optional, since reference types can be resolved lazily.
678 if (bt == T_OBJECT) {
679 if (s == vmSymbols::object_signature()) {
680 return object_java_mirror();
681 } else if (s == vmSymbols::class_signature()) {
682 return vmClasses::Class_klass()->java_mirror();
683 } else if (s == vmSymbols::string_signature()) {
684 return vmClasses::String_klass()->java_mirror();
685 }
686 }
687 return nullptr;
688 }
689
690 // An unresolved member name is a mere symbolic reference.
691 // Resolving it plants a vmtarget/vmindex in it,
692 // which refers directly to JVM internals.
693 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, int lookup_mode,
694 bool speculative_resolve, TRAPS) {
695 Handle empty;
696 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
697
698 if (java_lang_invoke_MemberName::vmtarget(mname()) != nullptr) {
699 // Already resolved.
700 DEBUG_ONLY(intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()));
701 assert(vmindex >= Method::nonvirtual_vtable_index, "");
702 return mname;
703 }
704
705 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
706 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
707 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
708 int flags = java_lang_invoke_MemberName::flags(mname());
709 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
710 if (!ref_kind_is_valid(ref_kind)) {
711 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
712 }
713
714 DEBUG_ONLY(intptr_t old_vmindex);
715 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
716
717 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
718 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
719 }
720
721 InstanceKlass* defc = nullptr;
722 {
723 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
724 if (defc_klass == nullptr) return empty; // a primitive; no resolution possible
725 if (!defc_klass->is_instance_klass()) {
726 if (!defc_klass->is_array_klass()) return empty;
727 defc_klass = vmClasses::Object_klass();
728 }
729 defc = InstanceKlass::cast(defc_klass);
730 }
731 if (defc == nullptr) {
732 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
733 }
734 defc->link_class(CHECK_(empty)); // possible safepoint
735
736 // convert the external string name to an internal symbol
737 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
738 if (name == nullptr) return empty; // no such name
739 if (name == vmSymbols::class_initializer_name())
740 return empty; // illegal name
741
742 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
743 if ((flags & ALL_KINDS) == IS_METHOD &&
744 (defc == vmClasses::MethodHandle_klass() || defc == vmClasses::VarHandle_klass()) &&
745 (ref_kind == JVM_REF_invokeVirtual ||
746 ref_kind == JVM_REF_invokeSpecial ||
747 // static invocation mode is required for _linkToVirtual, etc.:
748 ref_kind == JVM_REF_invokeStatic)) {
749 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
750 if (iid != vmIntrinsics::_none &&
751 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
752 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
753 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
754 mh_invoke_id = iid;
755 }
756 }
757
758 // convert the external string or reflective type to an internal signature
759 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
760 if (type == nullptr) return empty; // no such signature exists in the VM
761
762 // skip access check if it's trusted lookup
763 LinkInfo::AccessCheck access_check = caller != nullptr ?
764 LinkInfo::AccessCheck::required :
765 LinkInfo::AccessCheck::skip;
766 // skip loader constraints if it's trusted lookup or a public lookup
767 LinkInfo::LoaderConstraintCheck loader_constraint_check = (caller != nullptr && (lookup_mode & LM_UNCONDITIONAL) == 0) ?
768 LinkInfo::LoaderConstraintCheck::required :
769 LinkInfo::LoaderConstraintCheck::skip;
770
771 // Time to do the lookup.
772 switch (flags & ALL_KINDS) {
773 case IS_METHOD:
774 {
775 CallInfo result;
776 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
777 {
778 assert(!HAS_PENDING_EXCEPTION, "");
779 if (ref_kind == JVM_REF_invokeStatic) {
780 LinkResolver::resolve_static_call(result,
781 link_info, false, THREAD);
782 } else if (ref_kind == JVM_REF_invokeInterface) {
783 LinkResolver::resolve_interface_call(result, Handle(), defc,
784 link_info, false, THREAD);
785 } else if (mh_invoke_id != vmIntrinsics::_none) {
786 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
787 LinkResolver::resolve_handle_call(result, link_info, THREAD);
788 } else if (ref_kind == JVM_REF_invokeSpecial) {
789 LinkResolver::resolve_special_call(result, Handle(),
790 link_info, THREAD);
791 } else if (ref_kind == JVM_REF_invokeVirtual) {
792 LinkResolver::resolve_virtual_call(result, Handle(), defc,
793 link_info, false, THREAD);
794 } else {
795 assert(false, "ref_kind=%d", ref_kind);
796 }
797 if (HAS_PENDING_EXCEPTION) {
798 if (speculative_resolve) {
799 CLEAR_PENDING_EXCEPTION;
800 }
801 return empty;
802 }
803 }
804 if (result.resolved_appendix().not_null()) {
805 // The resolved MemberName must not be accompanied by an appendix argument,
806 // since there is no way to bind this value into the MemberName.
807 // Caller is responsible to prevent this from happening.
808 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
809 }
810 result.set_resolved_method_name(CHECK_(empty));
811 oop mname2 = init_method_MemberName(mname, result);
812 return Handle(THREAD, mname2);
813 }
814 case IS_OBJECT_CONSTRUCTOR:
815 {
816 CallInfo result;
817 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
818 {
819 assert(!HAS_PENDING_EXCEPTION, "");
820 if (name == vmSymbols::object_initializer_name() && type->is_void_method_signature()) {
821 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
822 } else {
823 break; // will throw after end of switch
824 }
825 if (HAS_PENDING_EXCEPTION) {
826 if (speculative_resolve) {
827 CLEAR_PENDING_EXCEPTION;
828 }
829 return empty;
830 }
831 }
832 assert(result.is_statically_bound(), "");
833 result.set_resolved_method_name(CHECK_(empty));
834 oop mname2 = init_method_MemberName(mname, result);
835 return Handle(THREAD, mname2);
836 }
837 case IS_FIELD:
838 {
839 fieldDescriptor result; // find_field initializes fd if found
840 {
841 assert(!HAS_PENDING_EXCEPTION, "");
842 LinkInfo link_info(defc, name, type, caller, LinkInfo::AccessCheck::skip, loader_constraint_check);
843 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
844 if (HAS_PENDING_EXCEPTION) {
845 if (speculative_resolve) {
846 CLEAR_PENDING_EXCEPTION;
847 }
848 return empty;
849 }
850 }
851 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
852 return Handle(THREAD, mname2);
853 }
854 default:
855 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
856 }
857
858 return empty;
859 }
860
861 // Conversely, a member name which is only initialized from JVM internals
862 // may have null defc, name, and type fields.
863 // Resolving it plants a vmtarget/vmindex in it,
864 // which refers directly to JVM internals.
865 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
866 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
867
868 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != nullptr);
869 bool have_name = (java_lang_invoke_MemberName::name(mname()) != nullptr);
870 bool have_type = (java_lang_invoke_MemberName::type(mname()) != nullptr);
871 int flags = java_lang_invoke_MemberName::flags(mname());
872
873 if (suppress != 0) {
874 if (suppress & _suppress_defc) have_defc = true;
875 if (suppress & _suppress_name) have_name = true;
876 if (suppress & _suppress_type) have_type = true;
877 }
878
879 if (have_defc && have_name && have_type) return; // nothing needed
880
881 switch (flags & ALL_KINDS) {
882 case IS_METHOD:
883 case IS_OBJECT_CONSTRUCTOR:
884 {
885 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
886 if (vmtarget == nullptr) {
887 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
888 }
889 methodHandle m(THREAD, vmtarget);
890 DEBUG_ONLY(vmtarget = nullptr); // safety
891 if (!have_defc) {
892 InstanceKlass* defc = m->method_holder();
893 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
894 }
895 if (!have_name) {
896 //not java_lang_String::create_from_symbol; let's intern member names
897 oop name = StringTable::intern(m->name(), CHECK);
898 java_lang_invoke_MemberName::set_name(mname(), name);
899 }
900 if (!have_type) {
901 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
902 java_lang_invoke_MemberName::set_type(mname(), type());
903 }
904 return;
905 }
906 case IS_FIELD:
907 {
908 oop clazz = java_lang_invoke_MemberName::clazz(mname());
909 if (clazz == nullptr) {
910 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
911 }
912 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
913 DEBUG_ONLY(clazz = nullptr); // safety
914 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
915 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
916 fieldDescriptor fd; // find_field initializes fd if found
917 if (!defc->find_field_from_offset(checked_cast<int>(vmindex), is_static, &fd))
918 break; // cannot expand
919 if (!have_name) {
920 //not java_lang_String::create_from_symbol; let's intern member names
921 oop name = StringTable::intern(fd.name(), CHECK);
922 java_lang_invoke_MemberName::set_name(mname(), name);
923 }
924 if (!have_type) {
925 // If it is a primitive field type, don't mess with short strings like "I".
926 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
927 if (type.is_null()) {
928 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
929 }
930 java_lang_invoke_MemberName::set_type(mname(), type());
931 }
932 return;
933 }
934 }
935 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
936 }
937
938 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
939 assert_locked_or_safepoint(CodeCache_lock);
940
941 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
942 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
943 // Try to purge stale entries on updates.
944 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
945 // in order to avoid memory leak, stale entries are purged whenever a dependency list
946 // is changed (both on addition and removal). Though memory reclamation is delayed,
947 // it avoids indefinite memory usage growth.
948 deps.add_dependent_nmethod(nm);
949 }
950
951 void MethodHandles::clean_dependency_context(oop call_site) {
952 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
953 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
954 deps.clean_unloading_dependents();
955 }
956
957 void MethodHandles::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, Handle call_site, Handle target) {
958 assert_lock_strong(Compile_lock);
959
960 CallSiteDepChange changes(call_site, target);
961 {
962 NoSafepointVerifier nsv;
963 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
964
965 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site());
966 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
967 deps.mark_dependent_nmethods(deopt_scope, changes);
968 }
969 }
970
971 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
972 if (log_is_enabled(Info, methodhandles)) {
973 const char* name = vmIntrinsics::name_at(iid);
974 if (*name == '_') name += 1;
975 const size_t len = strlen(name) + 50;
976 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
977 const char* suffix = "";
978 if (is_signature_polymorphic(iid)) {
979 if (is_signature_polymorphic_static(iid))
980 suffix = "/static";
981 else
982 suffix = "/private";
983 }
984 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
985 trace_method_handle(_masm, qname);
986 // LSan appears unable to keep track of qname, ignore it.
987 LSAN_IGNORE_OBJECT(qname);
988 // Note: Don't free the allocated char array because it's used
989 // during runtime.
990 }
991 }
992
993 //
994 // Here are the native methods in java.lang.invoke.MethodHandleNatives
995 // They are the private interface between this JVM and the HotSpot-specific
996 // Java code that implements JSR 292 method handles.
997 //
998 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
999 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1000 //
1001
1002 #ifndef PRODUCT
1003 #define EACH_NAMED_CON(template, requirement) \
1004 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1005 template(java_lang_invoke_MemberName,MN_IS_OBJECT_CONSTRUCTOR) \
1006 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1007 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1008 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1009 template(java_lang_invoke_MemberName,MN_TRUSTED_FINAL) \
1010 template(java_lang_invoke_MemberName,MN_HIDDEN_MEMBER) \
1011 template(java_lang_invoke_MemberName,MN_FLAT_FIELD) \
1012 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1013 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1014 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \
1015 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \
1016 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \
1017 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \
1018 template(java_lang_invoke_MemberName,MN_MODULE_MODE) \
1019 template(java_lang_invoke_MemberName,MN_UNCONDITIONAL_MODE) \
1020 template(java_lang_invoke_MemberName,MN_TRUSTED_MODE) \
1021 /*end*/
1022
1023 #define IGNORE_REQ(req_expr) /* req_expr */
1024 #define ONE_PLUS(scope,value) 1+
1025 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1026 #define VALUE_COMMA(scope,value) scope::value,
1027 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1028 #define STRING_NULL(scope,value) #value "\0"
1029 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1030
1031 static bool advertise_con_value(int which) {
1032 if (which < 0) return false;
1033 bool ok = true;
1034 int count = 0;
1035 #define INC_COUNT(scope,value) \
1036 ++count;
1037 #define CHECK_REQ(req_expr) \
1038 if (which < count) return ok; \
1039 ok = (req_expr);
1040 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1041 #undef INC_COUNT
1042 #undef CHECK_REQ
1043 assert(count == con_value_count, "");
1044 if (which < count) return ok;
1045 return false;
1046 }
1047
1048 #undef ONE_PLUS
1049 #undef VALUE_COMMA
1050 #undef STRING_NULL
1051 #undef EACH_NAMED_CON
1052 #endif // PRODUCT
1053
1054 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1055 #ifndef PRODUCT
1056 if (advertise_con_value(which)) {
1057 assert(which >= 0 && which < con_value_count, "");
1058 int con = con_values[which];
1059 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1060 if (box.not_null() && box->klass() == Universe::objectArrayKlass() && box->length() > 0) {
1061 const char* str = &con_names[0];
1062 for (int i = 0; i < which; i++)
1063 str += strlen(str) + 1; // skip name and null
1064 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1065 box->obj_at_put(0, name);
1066 }
1067 return con;
1068 }
1069 #endif
1070 return 0;
1071 }
1072 JVM_END
1073
1074 // void init(MemberName self, AccessibleObject ref)
1075 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1076 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1077 if (target_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1078 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1079 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1080 MethodHandles::init_MemberName(mname, target, CHECK);
1081 }
1082 JVM_END
1083
1084 // void expand(MemberName self)
1085 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1086 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1087 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1088 MethodHandles::expand_MemberName(mname, 0, CHECK);
1089 }
1090 JVM_END
1091
1092 // void resolve(MemberName self, Class<?> caller)
1093 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1094 jint lookup_mode, jboolean speculative_resolve)) {
1095 if (mname_jh == nullptr) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1096 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1097
1098 // The trusted Java code that calls this method should already have performed
1099 // access checks on behalf of the given caller. But, we can verify this.
1100 // This only verifies from the context of the lookup class. It does not
1101 // verify the lookup context for a Lookup object teleported from one module
1102 // to another. Such Lookup object can only access the intersection of the set
1103 // of accessible classes from both lookup class and previous lookup class.
1104 if (VerifyMethodHandles && (lookup_mode & LM_TRUSTED) == LM_TRUSTED && caller_jh != nullptr &&
1105 java_lang_invoke_MemberName::clazz(mname()) != nullptr) {
1106 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1107 if (reference_klass != nullptr && reference_klass->is_objArray_klass()) {
1108 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1109 }
1110
1111 // Reflection::verify_class_access can only handle instance classes.
1112 if (reference_klass != nullptr && reference_klass->is_instance_klass()) {
1113 // Emulate LinkResolver::check_klass_accessability.
1114 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1115 // access check on behalf of the caller if this is not a public lookup
1116 // i.e. lookup mode is not UNCONDITIONAL
1117 if ((lookup_mode & LM_UNCONDITIONAL) == 0
1118 && Reflection::verify_class_access(caller,
1119 InstanceKlass::cast(reference_klass),
1120 true) != Reflection::ACCESS_OK) {
1121 ResourceMark rm(THREAD);
1122 stringStream ss;
1123 ss.print("caller %s tried to access %s", caller->class_in_module_of_loader(),
1124 reference_klass->class_in_module_of_loader());
1125 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), ss.as_string());
1126 }
1127 }
1128 }
1129
1130 Klass* caller = caller_jh == nullptr ? nullptr :
1131 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1132 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, lookup_mode,
1133 speculative_resolve == JNI_TRUE,
1134 CHECK_NULL);
1135
1136 if (resolved.is_null()) {
1137 int flags = java_lang_invoke_MemberName::flags(mname());
1138 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1139 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1140 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1141 }
1142 if (speculative_resolve) {
1143 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1144 return nullptr;
1145 }
1146 if ((flags & ALL_KINDS) == IS_FIELD) {
1147 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1148 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1149 (flags & ALL_KINDS) == IS_OBJECT_CONSTRUCTOR) {
1150 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1151 } else {
1152 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1153 }
1154 }
1155
1156 return JNIHandles::make_local(THREAD, resolved());
1157 }
1158 JVM_END
1159
1160 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1161 if (mname == nullptr ||
1162 java_lang_invoke_MemberName::clazz(mname) == nullptr) {
1163 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1164 } else {
1165 int flags = java_lang_invoke_MemberName::flags(mname);
1166 if ((flags & IS_FIELD) != 0 &&
1167 (must_be_static
1168 ? (flags & JVM_ACC_STATIC) != 0
1169 : (flags & JVM_ACC_STATIC) == 0)) {
1170 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname);
1171 return (jlong) vmindex;
1172 }
1173 }
1174 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1175 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1176 return 0;
1177 }
1178
1179 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1180 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1181 }
1182 JVM_END
1183
1184 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1185 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1186 }
1187 JVM_END
1188
1189 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1190 // use the other function to perform sanity checks:
1191 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1192 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1193 return JNIHandles::make_local(THREAD, clazz);
1194 }
1195 JVM_END
1196
1197 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1198 if (mname_jh == nullptr) return nullptr;
1199 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1200 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1201 objArrayHandle result = oopFactory::new_objArray_handle(vmClasses::Object_klass(), 2, CHECK_NULL);
1202 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1203 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1204 result->obj_at_put(0, x);
1205
1206 int flags = java_lang_invoke_MemberName::flags(mname());
1207 if ((flags & IS_FIELD) != 0) {
1208 x = java_lang_invoke_MemberName::clazz(mname());
1209 } else {
1210 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1211 assert(vmtarget != nullptr && vmtarget->is_method(), "vmtarget is only method");
1212 x = mname();
1213 }
1214 result->obj_at_put(1, x);
1215 return JNIHandles::make_local(THREAD, result());
1216 }
1217 JVM_END
1218
1219 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1220 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1221 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1222 DeoptimizationScope deopt_scope;
1223 {
1224 // Walk all nmethods depending on this call site.
1225 MutexLocker mu(thread, Compile_lock);
1226 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1227 java_lang_invoke_CallSite::set_target(call_site(), target());
1228 // This is assumed to be an 'atomic' operation by verification.
1229 // So keep it under lock for now.
1230 deopt_scope.deoptimize_marked();
1231 }
1232 }
1233 JVM_END
1234
1235 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1236 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1237 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1238 DeoptimizationScope deopt_scope;
1239 {
1240 // Walk all nmethods depending on this call site.
1241 MutexLocker mu(thread, Compile_lock);
1242 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target);
1243 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1244 // This is assumed to be an 'atomic' operation by verification.
1245 // So keep it under lock for now.
1246 deopt_scope.deoptimize_marked();
1247 }
1248 }
1249 JVM_END
1250
1251 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1252 jobject caller_jh, jintArray index_info_jh,
1253 jint start, jint end,
1254 jobjectArray buf_jh, jint pos,
1255 jboolean resolve, jobject ifna_jh)) {
1256 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1257 if (caller_k == nullptr || !caller_k->is_instance_klass()) {
1258 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1259 }
1260 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1261 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1262 if (index_info_oop == nullptr ||
1263 index_info_oop->klass() != Universe::intArrayKlass() ||
1264 typeArrayOop(index_info_oop)->length() < 2) {
1265 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1266 }
1267 typeArrayHandle index_info(THREAD, index_info_oop);
1268 int bss_index_in_pool = index_info->int_at(1);
1269 // While we are here, take a quick look at the index info:
1270 if (bss_index_in_pool <= 0 ||
1271 bss_index_in_pool >= caller->constants()->length() ||
1272 index_info->int_at(0)
1273 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1274 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1275 }
1276 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1277 if (start < 0) {
1278 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1279 if (start == pseudo_index) {
1280 if (start >= end || 0 > pos || pos >= buf->length()) break;
1281 oop pseudo_arg = nullptr;
1282 switch (pseudo_index) {
1283 case -4: // bootstrap method
1284 {
1285 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool);
1286 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1287 break;
1288 }
1289 case -3: // name
1290 {
1291 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic);
1292 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1293 pseudo_arg = str();
1294 break;
1295 }
1296 case -2: // type
1297 {
1298 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic);
1299 Handle th;
1300 if (type->char_at(0) == JVM_SIGNATURE_FUNC) {
1301 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1302 } else {
1303 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1304 }
1305 pseudo_arg = th();
1306 break;
1307 }
1308 case -1: // argument count
1309 {
1310 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool);
1311 jvalue argc_value; argc_value.i = (jint)argc;
1312 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1313 break;
1314 }
1315 }
1316
1317 // Store the pseudo-argument, and advance the pointers.
1318 buf->obj_at_put(pos++, pseudo_arg);
1319 ++start;
1320 }
1321 }
1322 // When we are done with this there may be regular arguments to process too.
1323 }
1324 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1325 caller->constants()->
1326 copy_bootstrap_arguments_at(bss_index_in_pool,
1327 start, end, buf, pos,
1328 (resolve == JNI_TRUE), ifna, CHECK);
1329 }
1330 JVM_END
1331
1332 // It is called by a Cleaner object which ensures that dropped CallSites properly
1333 // deallocate their dependency information.
1334 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1335 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1336 DeoptimizationScope deopt_scope;
1337 {
1338 NoSafepointVerifier nsv;
1339 MutexLocker ml(THREAD, CodeCache_lock, Mutex::_no_safepoint_check_flag);
1340 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1341 deps.remove_and_mark_for_deoptimization_all_dependents(&deopt_scope);
1342 // This is assumed to be an 'atomic' operation by verification.
1343 // So keep it under lock for now.
1344 deopt_scope.deoptimize_marked();
1345 }
1346 }
1347 JVM_END
1348
1349 /**
1350 * Throws a java/lang/UnsupportedOperationException unconditionally.
1351 * This is required by the specification of MethodHandle.invoke if
1352 * invoked directly.
1353 */
1354 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1355 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1356 return nullptr;
1357 }
1358 JVM_END
1359
1360 /**
1361 * Throws a java/lang/UnsupportedOperationException unconditionally.
1362 * This is required by the specification of MethodHandle.invokeExact if
1363 * invoked directly.
1364 */
1365 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1366 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1367 return nullptr;
1368 }
1369 JVM_END
1370
1371 /// JVM_RegisterMethodHandleMethods
1372
1373 #define LANG "Ljava/lang/"
1374 #define JLINV "Ljava/lang/invoke/"
1375
1376 #define OBJ LANG "Object;"
1377 #define CLS LANG "Class;"
1378 #define STRG LANG "String;"
1379 #define CS JLINV "CallSite;"
1380 #define MT JLINV "MethodType;"
1381 #define MH JLINV "MethodHandle;"
1382 #define MEM JLINV "MemberName;"
1383 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1384
1385 #define CC (char*) /*cast a literal from (const char*)*/
1386 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1387
1388 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1389 static JNINativeMethod MHN_methods[] = {
1390 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1391 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1392 {CC "resolve", CC "(" MEM "" CLS "IZ)" MEM, FN_PTR(MHN_resolve_Mem)},
1393 // static native int getNamedCon(int which, Object[] name)
1394 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1395 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1396 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1397 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1398 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1399 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1400 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1401 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1402 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1403 };
1404
1405 static JNINativeMethod MH_methods[] = {
1406 // UnsupportedOperationException throwers
1407 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1408 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1409 };
1410
1411 /**
1412 * This one function is exported, used by NativeLookup.
1413 */
1414 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1415 assert(!MethodHandles::enabled(), "must not be enabled");
1416 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present");
1417
1418 oop mirror = vmClasses::MethodHandle_klass()->java_mirror();
1419 jclass MH_class = (jclass) JNIHandles::make_local(THREAD, mirror);
1420
1421 {
1422 ThreadToNativeFromVM ttnfv(thread);
1423
1424 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1425 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1426 "register java.lang.invoke.MethodHandleNative natives");
1427
1428 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1429 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1430 "register java.lang.invoke.MethodHandle natives");
1431 }
1432
1433 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1434
1435 MethodHandles::set_enabled(true);
1436 }
1437 JVM_END