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