1 /*
2 * Copyright (c) 2008, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmClasses.hpp"
31 #include "code/codeCache.hpp"
32 #include "code/dependencyContext.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "interpreter/oopMapCache.hpp"
36 #include "interpreter/linkResolver.hpp"
37 #include "jvm_io.h"
38 #include "logging/log.hpp"
39 #include "logging/logStream.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.hpp"
44 #include "oops/klass.inline.hpp"
45 #include "oops/objArrayKlass.hpp"
46 #include "oops/objArrayOop.inline.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "oops/typeArrayOop.inline.hpp"
49 #include "prims/methodHandles.hpp"
50 #include "runtime/deoptimization.hpp"
51 #include "runtime/fieldDescriptor.inline.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "runtime/interfaceSupport.inline.hpp"
54 #include "runtime/javaCalls.hpp"
55 #include "runtime/jniHandles.inline.hpp"
56 #include "runtime/timerTrace.hpp"
57 #include "runtime/reflection.hpp"
58 #include "runtime/reflectionUtils.hpp"
59 #include "runtime/safepointVerifiers.hpp"
60 #include "runtime/signature.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "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 = NULL;
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() != NULL, "should be present");
88 assert(_adapter_code == NULL, "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 != NULL) {
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 FLATTENED = java_lang_invoke_MemberName::MN_FLATTENED,
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 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
143 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
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 == NULL) {
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 != NULL && k->is_instance_klass()) {
202 fieldDescriptor fd(InstanceKlass::cast(k), slot);
203 oop mname2 = init_field_MemberName(mname, fd);
204 if (mname2 != NULL) {
205 // Since we have the reified name and type handy, add them to the result.
206 if (java_lang_invoke_MemberName::name(mname2) == NULL)
207 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
208 if (java_lang_invoke_MemberName::type(mname2) == NULL)
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 != NULL && k->is_instance_klass()) {
218 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
219 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
220 return NULL; // 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 != NULL && k->is_instance_klass()) {
229 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
230 if (m == NULL) return NULL;
231 CallInfo info(m, k, CHECK_NULL);
232 return init_method_MemberName(mname, info);
233 }
234 }
235 return NULL;
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 != NULL, "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 NULL; // 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 NULL;
330 }
331
332 // @CallerSensitive annotation detected
333 if (m->caller_sensitive()) {
334 flags |= CALLER_SENSITIVE;
335 }
336
337 Handle resolved_method = info.resolved_method_name();
338 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(),
339 "Should not change after link resolution");
340
341 oop mname_oop = mname();
342 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
343 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
344 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
345 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
346 // Note: name and type can be lazily computed by resolve_MemberName,
347 // if Java code needs them as resolved String and MethodType objects.
348 // If relevant, the vtable or itable value is stored as vmindex.
349 // This is done eagerly, since it is readily available without
350 // constructing any new objects.
351 return mname();
352 }
353
354 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
355 InstanceKlass* ik = fd.field_holder();
356 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
357 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
358 if (fd.is_trusted_final()) flags |= TRUSTED_FINAL;
359 if (fd.is_inlined()) flags |= FLATTENED;;
360 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
361 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
362
363 oop mname_oop = mname();
364 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
365 java_lang_invoke_MemberName::set_method (mname_oop, NULL);
366 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
367 java_lang_invoke_MemberName::set_clazz (mname_oop, ik->java_mirror());
368
369 oop type = field_signature_type_or_null(fd.signature());
370 oop name = field_name_or_null(fd.name());
371 if (name != NULL)
372 java_lang_invoke_MemberName::set_name(mname_oop, name);
373 if (type != NULL)
374 java_lang_invoke_MemberName::set_type(mname_oop, type);
375 // Note: name and type can be lazily computed by resolve_MemberName,
376 // if Java code needs them as resolved String and Class objects.
377 // Note that the incoming type oop might be pre-resolved (non-null).
378 // The base clazz and field offset (vmindex) must be eagerly stored,
379 // because they unambiguously identify the field.
380 // Although the fieldDescriptor::_index would also identify the field,
381 // we do not use it, because it is harder to decode.
382 // TO DO: maybe intern mname_oop
383 return mname();
384 }
385
386 // JVM 2.9 Special Methods:
387 // A method is signature polymorphic if and only if all of the following conditions hold :
388 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
389 // * It has a single formal parameter of type Object[].
390 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
391 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
392 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
393 if (klass == NULL)
394 return false;
395 // The following test will fail spuriously during bootstrap of MethodHandle itself:
396 // if (klass != vmClasses::MethodHandle_klass())
397 // Test the name instead:
398 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
399 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
400 return false;
401 }
402
403 // Look up signature polymorphic method with polymorphic return type
404 Symbol* poly_sig = vmSymbols::object_array_object_signature();
405 InstanceKlass* iklass = InstanceKlass::cast(klass);
406 Method* m = iklass->find_method(name, poly_sig);
407 if (m != NULL) {
408 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
409 int flags = m->access_flags().as_int();
410 if ((flags & required) == required) {
411 return true;
412 }
413 }
414
415 // Look up signature polymorphic method with non-polymorphic (non Object) return type
416 int me;
417 int ms = iklass->find_method_by_name(name, &me);
418 if (ms == -1) return false;
419 for (; ms < me; ms++) {
420 Method* m = iklass->methods()->at(ms);
421 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
422 int flags = m->access_flags().as_int();
423 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
424 return true;
425 }
426 }
427 return false;
428 }
429
430
431 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
432 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
433 switch (iid) {
434 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
435 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
436 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
437 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
438 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
439 case vmIntrinsics::_linkToNative: return vmSymbols::linkToNative_name();
440 default:
441 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
442 return 0;
443 }
444 }
445
446 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
447 switch(id) {
448 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
449 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
450 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
451 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
452 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
453 default:
454 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
455 return Bytecodes::_illegal;
456 }
457 }
458
459 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
460 switch (iid) {
461 case vmIntrinsics::_invokeBasic: return 0;
462 case vmIntrinsics::_linkToNative: return 0;
463 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
464 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
465 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
466 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
467 default:
468 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
469 return 0;
470 }
471 }
472
473 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
474 vmSymbolID name_id = vmSymbols::find_sid(name);
475 switch (name_id) {
476 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
477 case VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
478 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
479 case VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
480
481 // There is one static signature-polymorphic method for each JVM invocation mode.
482 case VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
483 case VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
484 case VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
485 case VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
486 case VM_SYMBOL_ENUM_NAME(linkToNative_name): return vmIntrinsics::_linkToNative;
487 default: break;
488 }
489
490 // Cover the case of invokeExact and any future variants of invokeFoo.
491 Klass* mh_klass = vmClasses::klass_at(VM_CLASS_ID(MethodHandle_klass));
492 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
493 return vmIntrinsics::_invokeGeneric;
494 }
495
496 // Cover the case of methods on VarHandle.
497 Klass* vh_klass = vmClasses::klass_at(VM_CLASS_ID(VarHandle_klass));
498 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
499 return vmIntrinsics::_invokeGeneric;
500 }
501
502 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
503 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
504 return vmIntrinsics::_none;
505 }
506
507 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
508 if (klass != NULL &&
509 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
510 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
511 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
512 if (iid != vmIntrinsics::_none)
513 return iid;
514 if (is_method_handle_invoke_name(klass, name))
515 return vmIntrinsics::_invokeGeneric;
516 }
517 return vmIntrinsics::_none;
518 }
519
520 // Returns true if method is signature polymorphic and public
521 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) {
522 if (is_signature_polymorphic_name(klass, name)) {
523 InstanceKlass* iklass = InstanceKlass::cast(klass);
524 int me;
525 int ms = iklass->find_method_by_name(name, &me);
526 assert(ms != -1, "");
527 for (; ms < me; ms++) {
528 Method* m = iklass->methods()->at(ms);
529 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC;
530 int flags = m->access_flags().as_int();
531 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
532 return true;
533 }
534 }
535 }
536 return false;
537 }
538
539 // convert the external string or reflective type to an internal signature
540 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
541 if (java_lang_invoke_MethodType::is_instance(type_str)) {
542 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found);
543 } else if (java_lang_Class::is_instance(type_str)) {
544 return java_lang_Class::as_signature(type_str, false);
545 } else if (java_lang_String::is_instance(type_str)) {
546 if (intern_if_not_found) {
547 return java_lang_String::as_symbol(type_str);
548 } else {
549 return java_lang_String::as_symbol_or_null(type_str);
550 }
551 } else {
552 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
553 }
554 }
555
556 static const char OBJ_SIG[] = "Ljava/lang/Object;";
557 enum { OBJ_SIG_LEN = 18 };
558
559 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
560 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
561 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
562 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) {
563 switch (ss.type()) {
564 case T_OBJECT:
565 // only java/lang/Object is valid here
566 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, OBJ_SIG_LEN) != 0)
567 return false;
568 break;
569 case T_VOID:
570 case T_INT:
571 case T_LONG:
572 case T_FLOAT:
573 case T_DOUBLE:
574 break;
575 default:
576 // subword types (T_BYTE etc.), Q-descriptors, arrays
577 return false;
578 }
579 }
580 return true;
581 }
582
583 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg) {
584 Symbol* bsig = NULL;
585 if (sig == NULL) {
586 return sig;
587 } else if (is_basic_type_signature(sig)) {
588 sig->increment_refcount();
589 return sig; // that was easy
590 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) {
591 BasicType bt = Signature::basic_type(sig);
592 if (is_subword_type(bt)) {
593 bsig = vmSymbols::int_signature();
594 } else {
595 assert(is_reference_type(bt), "is_basic_type_signature was false");
596 bsig = vmSymbols::object_signature();
597 }
598 } else {
599 ResourceMark rm;
600 stringStream buffer(128);
601 buffer.put(JVM_SIGNATURE_FUNC);
602 int arg_pos = 0, keep_arg_pos = -1;
603 if (keep_last_arg)
604 keep_arg_pos = ArgumentCount(sig).size() - 1;
605 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
606 BasicType bt = ss.type();
607 size_t this_arg_pos = buffer.size();
608 if (ss.at_return_type()) {
609 buffer.put(JVM_SIGNATURE_ENDFUNC);
610 }
611 if (arg_pos == keep_arg_pos) {
612 buffer.write((char*) ss.raw_bytes(),
613 (int) ss.raw_length());
614 } else if (is_reference_type(bt)) {
615 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
616 } else {
617 if (is_subword_type(bt))
618 bt = T_INT;
619 buffer.put(type2char(bt));
620 }
621 arg_pos++;
622 }
623 const char* sigstr = buffer.base();
624 int siglen = (int) buffer.size();
625 bsig = SymbolTable::new_symbol(sigstr, siglen);
626 }
627 assert(is_basic_type_signature(bsig) ||
628 // detune assert in case the injected argument is not a basic type:
629 keep_last_arg, "");
630 return bsig;
631 }
632
633 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
634 Symbol* sig) {
635 st = st ? st : tty;
636 bool prev_type = false;
637 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC);
638 if (is_method) st->put(JVM_SIGNATURE_FUNC);
639 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
640 if (ss.at_return_type())
641 st->put(JVM_SIGNATURE_ENDFUNC);
642 else if (prev_type)
643 st->put(',');
644 const char* cp = (const char*) ss.raw_bytes();
645 if (ss.is_array()) {
646 st->put(JVM_SIGNATURE_ARRAY);
647 if (ss.array_prefix_length() == 1)
648 st->put(cp[1]);
649 else
650 st->put(JVM_SIGNATURE_CLASS);
651 } else {
652 st->put(cp[0]);
653 }
654 }
655 }
656
657
658
659 static oop object_java_mirror() {
660 return vmClasses::Object_klass()->java_mirror();
661 }
662
663 oop MethodHandles::field_name_or_null(Symbol* s) {
664 if (s == NULL) return NULL;
665 return StringTable::lookup(s);
666 }
667
668 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
669 if (s == NULL) return NULL;
670 BasicType bt = Signature::basic_type(s);
671 if (is_java_primitive(bt)) {
672 assert(s->utf8_length() == 1, "");
673 return java_lang_Class::primitive_mirror(bt);
674 }
675 // Here are some more short cuts for common types.
676 // They are optional, since reference types can be resolved lazily.
677 if (bt == T_OBJECT) {
678 if (s == vmSymbols::object_signature()) {
679 return object_java_mirror();
680 } else if (s == vmSymbols::class_signature()) {
681 return vmClasses::Class_klass()->java_mirror();
682 } else if (s == vmSymbols::string_signature()) {
683 return vmClasses::String_klass()->java_mirror();
684 }
685 }
686 return NULL;
687 }
688
689 // An unresolved member name is a mere symbolic reference.
690 // Resolving it plants a vmtarget/vmindex in it,
691 // which refers directly to JVM internals.
692 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, int lookup_mode,
693 bool speculative_resolve, TRAPS) {
694 Handle empty;
695 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
696
697 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
698 // Already resolved.
699 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
700 assert(vmindex >= Method::nonvirtual_vtable_index, "");
701 return mname;
702 }
703
704 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
705 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
706 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
707 int flags = java_lang_invoke_MemberName::flags(mname());
708 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
709 if (!ref_kind_is_valid(ref_kind)) {
710 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
711 }
712
713 DEBUG_ONLY(int old_vmindex);
714 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
715
716 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
717 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
718 }
719
720 InstanceKlass* defc = NULL;
721 {
722 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
723 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
724 if (!defc_klass->is_instance_klass()) {
725 if (!defc_klass->is_array_klass()) return empty;
726 defc_klass = vmClasses::Object_klass();
727 }
728 defc = InstanceKlass::cast(defc_klass);
729 }
730 if (defc == NULL) {
731 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
732 }
733 defc->link_class(CHECK_(empty)); // possible safepoint
734
735 // convert the external string name to an internal symbol
736 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
737 if (name == NULL) return empty; // no such name
738 if (name == vmSymbols::class_initializer_name())
739 return empty; // illegal name
740
741 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
742 if ((flags & ALL_KINDS) == IS_METHOD &&
743 (defc == vmClasses::MethodHandle_klass() || defc == vmClasses::VarHandle_klass()) &&
744 (ref_kind == JVM_REF_invokeVirtual ||
745 ref_kind == JVM_REF_invokeSpecial ||
746 // static invocation mode is required for _linkToVirtual, etc.:
747 ref_kind == JVM_REF_invokeStatic)) {
748 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
749 if (iid != vmIntrinsics::_none &&
750 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
751 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
752 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
753 mh_invoke_id = iid;
754 }
755 }
756
757 // convert the external string or reflective type to an internal signature
758 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
759 if (type == NULL) return empty; // no such signature exists in the VM
760
761 // skip access check if it's trusted lookup
762 LinkInfo::AccessCheck access_check = caller != NULL ?
763 LinkInfo::AccessCheck::required :
764 LinkInfo::AccessCheck::skip;
765 // skip loader constraints if it's trusted lookup or a public lookup
766 LinkInfo::LoaderConstraintCheck loader_constraint_check = (caller != NULL && (lookup_mode & LM_UNCONDITIONAL) == 0) ?
767 LinkInfo::LoaderConstraintCheck::required :
768 LinkInfo::LoaderConstraintCheck::skip;
769
770 // Time to do the lookup.
771 switch (flags & ALL_KINDS) {
772 case IS_METHOD:
773 {
774 CallInfo result;
775 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
776 {
777 assert(!HAS_PENDING_EXCEPTION, "");
778 if (ref_kind == JVM_REF_invokeStatic) {
779 LinkResolver::resolve_static_call(result,
780 link_info, false, THREAD);
781 } else if (ref_kind == JVM_REF_invokeInterface) {
782 LinkResolver::resolve_interface_call(result, Handle(), defc,
783 link_info, false, THREAD);
784 } else if (mh_invoke_id != vmIntrinsics::_none) {
785 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
786 LinkResolver::resolve_handle_call(result, link_info, THREAD);
787 } else if (ref_kind == JVM_REF_invokeSpecial) {
788 LinkResolver::resolve_special_call(result, Handle(),
789 link_info, THREAD);
790 } else if (ref_kind == JVM_REF_invokeVirtual) {
791 LinkResolver::resolve_virtual_call(result, Handle(), defc,
792 link_info, false, THREAD);
793 } else {
794 assert(false, "ref_kind=%d", ref_kind);
795 }
796 if (HAS_PENDING_EXCEPTION) {
797 if (speculative_resolve) {
798 CLEAR_PENDING_EXCEPTION;
799 }
800 return empty;
801 }
802 }
803 if (result.resolved_appendix().not_null()) {
804 // The resolved MemberName must not be accompanied by an appendix argument,
805 // since there is no way to bind this value into the MemberName.
806 // Caller is responsible to prevent this from happening.
807 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
808 }
809 result.set_resolved_method_name(CHECK_(empty));
810 oop mname2 = init_method_MemberName(mname, result);
811 return Handle(THREAD, mname2);
812 }
813 case IS_OBJECT_CONSTRUCTOR:
814 {
815 CallInfo result;
816 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check);
817 {
818 assert(!HAS_PENDING_EXCEPTION, "");
819 if (name == vmSymbols::object_initializer_name() && type->is_void_method_signature()) {
820 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
821 } else if (name == vmSymbols::inline_factory_name()) {
822 LinkResolver::resolve_static_call(result, link_info, false, THREAD);
823 } else {
824 break; // will throw after end of switch
825 }
826 if (HAS_PENDING_EXCEPTION) {
827 if (speculative_resolve) {
828 CLEAR_PENDING_EXCEPTION;
829 }
830 return empty;
831 }
832 }
833 assert(result.is_statically_bound(), "");
834 result.set_resolved_method_name(CHECK_(empty));
835 oop mname2 = init_method_MemberName(mname, result);
836 return Handle(THREAD, mname2);
837 }
838 case IS_FIELD:
839 {
840 fieldDescriptor result; // find_field initializes fd if found
841 {
842 assert(!HAS_PENDING_EXCEPTION, "");
843 LinkInfo link_info(defc, name, type, caller, LinkInfo::AccessCheck::skip, loader_constraint_check);
844 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
845 if (HAS_PENDING_EXCEPTION) {
846 if (speculative_resolve) {
847 CLEAR_PENDING_EXCEPTION;
848 }
849 return empty;
850 }
851 }
852 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
853 return Handle(THREAD, mname2);
854 }
855 default:
856 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
857 }
858
859 return empty;
860 }
861
862 // Conversely, a member name which is only initialized from JVM internals
863 // may have null defc, name, and type fields.
864 // Resolving it plants a vmtarget/vmindex in it,
865 // which refers directly to JVM internals.
866 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
867 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
868
869 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
870 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
871 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
872 int flags = java_lang_invoke_MemberName::flags(mname());
873
874 if (suppress != 0) {
875 if (suppress & _suppress_defc) have_defc = true;
876 if (suppress & _suppress_name) have_name = true;
877 if (suppress & _suppress_type) have_type = true;
878 }
879
880 if (have_defc && have_name && have_type) return; // nothing needed
881
882 switch (flags & ALL_KINDS) {
883 case IS_METHOD:
884 case IS_OBJECT_CONSTRUCTOR:
885 {
886 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
887 if (vmtarget == NULL) {
888 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
889 }
890 methodHandle m(THREAD, vmtarget);
891 DEBUG_ONLY(vmtarget = NULL); // safety
892 if (!have_defc) {
893 InstanceKlass* defc = m->method_holder();
894 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
895 }
896 if (!have_name) {
897 //not java_lang_String::create_from_symbol; let's intern member names
898 oop name = StringTable::intern(m->name(), CHECK);
899 java_lang_invoke_MemberName::set_name(mname(), name);
900 }
901 if (!have_type) {
902 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
903 java_lang_invoke_MemberName::set_type(mname(), type());
904 }
905 return;
906 }
907 case IS_FIELD:
908 {
909 oop clazz = java_lang_invoke_MemberName::clazz(mname());
910 if (clazz == NULL) {
911 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
912 }
913 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
914 DEBUG_ONLY(clazz = NULL); // safety
915 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
916 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
917 fieldDescriptor fd; // find_field initializes fd if found
918 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
919 break; // cannot expand
920 if (!have_name) {
921 //not java_lang_String::create_from_symbol; let's intern member names
922 oop name = StringTable::intern(fd.name(), CHECK);
923 java_lang_invoke_MemberName::set_name(mname(), name);
924 }
925 if (!have_type) {
926 // If it is a primitive field type, don't mess with short strings like "I".
927 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
928 if (type.is_null()) {
929 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
930 }
931 java_lang_invoke_MemberName::set_type(mname(), type());
932 }
933 return;
934 }
935 }
936 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
937 }
938
939 int MethodHandles::find_MemberNames(Klass* k,
940 Symbol* name, Symbol* sig,
941 int mflags, Klass* caller,
942 int skip, objArrayHandle results, TRAPS) {
943 // %%% take caller into account!
944
945 if (k == NULL || !k->is_instance_klass()) return -1;
946
947 int rfill = 0, rlimit = results->length(), rskip = skip;
948 // overflow measurement:
949 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
950
951 int match_flags = mflags;
952 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
953 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
954 bool local_only = !(search_superc | search_intfc);
955
956 if (name != NULL) {
957 if (name->utf8_length() == 0) return 0; // a match is not possible
958 }
959 if (sig != NULL) {
960 if (sig->starts_with(JVM_SIGNATURE_FUNC))
961 match_flags &= ~(IS_FIELD | IS_TYPE);
962 else
963 match_flags &= ~(IS_OBJECT_CONSTRUCTOR | IS_METHOD);
964 }
965
966 if ((match_flags & IS_TYPE) != 0) {
967 // NYI, and Core Reflection works quite well for this query
968 }
969
970 if ((match_flags & IS_FIELD) != 0) {
971 InstanceKlass* ik = InstanceKlass::cast(k);
972 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
973 if (name != NULL && st.name() != name)
974 continue;
975 if (sig != NULL && st.signature() != sig)
976 continue;
977 // passed the filters
978 if (rskip > 0) {
979 --rskip;
980 } else if (rfill < rlimit) {
981 Handle result(THREAD, results->obj_at(rfill++));
982 if (!java_lang_invoke_MemberName::is_instance(result()))
983 return -99; // caller bug!
984 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
985 if (saved != result())
986 results->obj_at_put(rfill-1, saved); // show saved instance to user
987 } else if (++overflow >= overflow_limit) {
988 match_flags = 0; break; // got tired of looking at overflow
989 }
990 }
991 }
992
993 if ((match_flags & (IS_METHOD | IS_OBJECT_CONSTRUCTOR)) != 0) {
994 // watch out for these guys:
995 Symbol* init_name = vmSymbols::object_initializer_name();
996 Symbol* clinit_name = vmSymbols::class_initializer_name();
997 Symbol* factory_name = vmSymbols::inline_factory_name();
998 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
999 bool ctor_ok = true, sfac_ok = true;
1000 // fix name so that it captures the intention of IS_OBJECT_CONSTRUCTOR
1001 if (!(match_flags & IS_METHOD)) {
1002 // constructors only
1003 if (name == NULL) {
1004 name = init_name;
1005 } else if (name != init_name) {
1006 return 0; // no constructors of this method name
1007 }
1008 sfac_ok = false;
1009 } else if (!(match_flags & IS_OBJECT_CONSTRUCTOR)) {
1010 // methods only
1011 ctor_ok = false; // but sfac_ok is true
1012 } else {
1013 // caller will accept either sort; no need to adjust name
1014 }
1015 InstanceKlass* ik = InstanceKlass::cast(k);
1016 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
1017 Method* m = st.method();
1018 Symbol* m_name = m->name();
1019 if (m_name == clinit_name)
1020 continue;
1021 if (name != NULL && m_name != name)
1022 continue;
1023 if (sig != NULL && m->signature() != sig)
1024 continue;
1025 if (m_name == init_name) { // might be ctor
1026 if (m->is_object_constructor() && !ctor_ok) continue;
1027 }
1028 if (m_name == factory_name) { // might be sfac
1029 if (m->is_static_vnew_factory() && !sfac_ok) continue;
1030 }
1031 // passed the filters
1032 if (rskip > 0) {
1033 --rskip;
1034 } else if (rfill < rlimit) {
1035 Handle result(THREAD, results->obj_at(rfill++));
1036 if (!java_lang_invoke_MemberName::is_instance(result()))
1037 return -99; // caller bug!
1038 CallInfo info(m, NULL, CHECK_0);
1039 oop saved = MethodHandles::init_method_MemberName(result, info);
1040 if (saved != result())
1041 results->obj_at_put(rfill-1, saved); // show saved instance to user
1042 } else if (++overflow >= overflow_limit) {
1043 match_flags = 0; break; // got tired of looking at overflow
1044 }
1045 }
1046 }
1047
1048 // return number of elements we at leasted wanted to initialize
1049 return rfill + overflow;
1050 }
1051
1052 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
1053 assert_locked_or_safepoint(CodeCache_lock);
1054
1055 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1056 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1057 // Try to purge stale entries on updates.
1058 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
1059 // in order to avoid memory leak, stale entries are purged whenever a dependency list
1060 // is changed (both on addition and removal). Though memory reclamation is delayed,
1061 // it avoids indefinite memory usage growth.
1062 deps.add_dependent_nmethod(nm);
1063 }
1064
1065 void MethodHandles::clean_dependency_context(oop call_site) {
1066 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1067 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1068 deps.clean_unloading_dependents();
1069 }
1070
1071 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
1072 assert_lock_strong(Compile_lock);
1073
1074 int marked = 0;
1075 CallSiteDepChange changes(call_site, target);
1076 {
1077 NoSafepointVerifier nsv;
1078 MutexLocker mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1079
1080 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site());
1081 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1082 marked = deps.mark_dependent_nmethods(changes);
1083 }
1084 if (marked > 0) {
1085 // At least one nmethod has been marked for deoptimization.
1086 Deoptimization::deoptimize_all_marked();
1087 }
1088 }
1089
1090 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {
1091 if (log_is_enabled(Info, methodhandles)) {
1092 const char* name = vmIntrinsics::name_at(iid);
1093 if (*name == '_') name += 1;
1094 const size_t len = strlen(name) + 50;
1095 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
1096 const char* suffix = "";
1097 if (is_signature_polymorphic(iid)) {
1098 if (is_signature_polymorphic_static(iid))
1099 suffix = "/static";
1100 else
1101 suffix = "/private";
1102 }
1103 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
1104 trace_method_handle(_masm, qname);
1105 // Note: Don't free the allocated char array because it's used
1106 // during runtime.
1107 }
1108 }
1109
1110 //
1111 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1112 // They are the private interface between this JVM and the HotSpot-specific
1113 // Java code that implements JSR 292 method handles.
1114 //
1115 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1116 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1117 //
1118
1119 #ifndef PRODUCT
1120 #define EACH_NAMED_CON(template, requirement) \
1121 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1122 template(java_lang_invoke_MemberName,MN_IS_OBJECT_CONSTRUCTOR) \
1123 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1124 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1125 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1126 template(java_lang_invoke_MemberName,MN_TRUSTED_FINAL) \
1127 template(java_lang_invoke_MemberName,MN_FLATTENED) \
1128 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1129 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1130 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1131 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1132 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \
1133 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \
1134 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \
1135 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \
1136 template(java_lang_invoke_MemberName,MN_MODULE_MODE) \
1137 template(java_lang_invoke_MemberName,MN_UNCONDITIONAL_MODE) \
1138 template(java_lang_invoke_MemberName,MN_TRUSTED_MODE) \
1139 /*end*/
1140
1141 #define IGNORE_REQ(req_expr) /* req_expr */
1142 #define ONE_PLUS(scope,value) 1+
1143 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1144 #define VALUE_COMMA(scope,value) scope::value,
1145 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1146 #define STRING_NULL(scope,value) #value "\0"
1147 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1148
1149 static bool advertise_con_value(int which) {
1150 if (which < 0) return false;
1151 bool ok = true;
1152 int count = 0;
1153 #define INC_COUNT(scope,value) \
1154 ++count;
1155 #define CHECK_REQ(req_expr) \
1156 if (which < count) return ok; \
1157 ok = (req_expr);
1158 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1159 #undef INC_COUNT
1160 #undef CHECK_REQ
1161 assert(count == con_value_count, "");
1162 if (which < count) return ok;
1163 return false;
1164 }
1165
1166 #undef ONE_PLUS
1167 #undef VALUE_COMMA
1168 #undef STRING_NULL
1169 #undef EACH_NAMED_CON
1170 #endif // PRODUCT
1171
1172 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1173 #ifndef PRODUCT
1174 if (advertise_con_value(which)) {
1175 assert(which >= 0 && which < con_value_count, "");
1176 int con = con_values[which];
1177 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1178 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1179 const char* str = &con_names[0];
1180 for (int i = 0; i < which; i++)
1181 str += strlen(str) + 1; // skip name and null
1182 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1183 box->obj_at_put(0, name);
1184 }
1185 return con;
1186 }
1187 #endif
1188 return 0;
1189 }
1190 JVM_END
1191
1192 // void init(MemberName self, AccessibleObject ref)
1193 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1194 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1195 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1196 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1197 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1198 MethodHandles::init_MemberName(mname, target, CHECK);
1199 }
1200 JVM_END
1201
1202 // void expand(MemberName self)
1203 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1204 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1205 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1206 MethodHandles::expand_MemberName(mname, 0, CHECK);
1207 }
1208 JVM_END
1209
1210 // void resolve(MemberName self, Class<?> caller)
1211 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh,
1212 jint lookup_mode, jboolean speculative_resolve)) {
1213 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1214 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1215
1216 // The trusted Java code that calls this method should already have performed
1217 // access checks on behalf of the given caller. But, we can verify this.
1218 // This only verifies from the context of the lookup class. It does not
1219 // verify the lookup context for a Lookup object teleported from one module
1220 // to another. Such Lookup object can only access the intersection of the set
1221 // of accessible classes from both lookup class and previous lookup class.
1222 if (VerifyMethodHandles && (lookup_mode & LM_TRUSTED) == LM_TRUSTED && caller_jh != NULL &&
1223 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1224 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1225 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1226 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1227 }
1228
1229 // Reflection::verify_class_access can only handle instance classes.
1230 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1231 // Emulate LinkResolver::check_klass_accessability.
1232 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1233 // access check on behalf of the caller if this is not a public lookup
1234 // i.e. lookup mode is not UNCONDITIONAL
1235 if ((lookup_mode & LM_UNCONDITIONAL) == 0
1236 && Reflection::verify_class_access(caller,
1237 InstanceKlass::cast(reference_klass),
1238 true) != Reflection::ACCESS_OK) {
1239 ResourceMark rm(THREAD);
1240 stringStream ss;
1241 ss.print("caller %s tried to access %s", caller->class_in_module_of_loader(),
1242 reference_klass->class_in_module_of_loader());
1243 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), ss.as_string());
1244 }
1245 }
1246 }
1247
1248 Klass* caller = caller_jh == NULL ? NULL :
1249 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1250 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, lookup_mode,
1251 speculative_resolve == JNI_TRUE,
1252 CHECK_NULL);
1253
1254 if (resolved.is_null()) {
1255 int flags = java_lang_invoke_MemberName::flags(mname());
1256 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1257 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1258 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1259 }
1260 if (speculative_resolve) {
1261 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively");
1262 return NULL;
1263 }
1264 if ((flags & ALL_KINDS) == IS_FIELD) {
1265 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1266 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1267 (flags & ALL_KINDS) == IS_OBJECT_CONSTRUCTOR) {
1268 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1269 } else {
1270 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1271 }
1272 }
1273
1274 return JNIHandles::make_local(THREAD, resolved());
1275 }
1276 JVM_END
1277
1278 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1279 if (mname == NULL ||
1280 java_lang_invoke_MemberName::clazz(mname) == NULL) {
1281 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1282 } else {
1283 int flags = java_lang_invoke_MemberName::flags(mname);
1284 if ((flags & IS_FIELD) != 0 &&
1285 (must_be_static
1286 ? (flags & JVM_ACC_STATIC) != 0
1287 : (flags & JVM_ACC_STATIC) == 0)) {
1288 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1289 return (jlong) vmindex;
1290 }
1291 }
1292 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1293 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1294 return 0;
1295 }
1296
1297 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1298 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1299 }
1300 JVM_END
1301
1302 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1303 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1304 }
1305 JVM_END
1306
1307 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1308 // use the other function to perform sanity checks:
1309 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1310 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1311 return JNIHandles::make_local(THREAD, clazz);
1312 }
1313 JVM_END
1314
1315 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1316 if (mname_jh == NULL) return NULL;
1317 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1318 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1319 objArrayHandle result = oopFactory::new_objArray_handle(vmClasses::Object_klass(), 2, CHECK_NULL);
1320 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1321 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1322 result->obj_at_put(0, x);
1323
1324 int flags = java_lang_invoke_MemberName::flags(mname());
1325 if ((flags & IS_FIELD) != 0) {
1326 x = java_lang_invoke_MemberName::clazz(mname());
1327 } else {
1328 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1329 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1330 x = mname();
1331 }
1332 result->obj_at_put(1, x);
1333 return JNIHandles::make_local(THREAD, result());
1334 }
1335 JVM_END
1336
1337
1338
1339 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1340 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1341 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1342 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1343 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1344 if (clazz_jh == NULL || results_jh == NULL) return -1;
1345 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1346
1347 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1348 if (results.is_null() || !results->is_objArray()) return -1;
1349
1350 TempNewSymbol name = NULL;
1351 TempNewSymbol sig = NULL;
1352 if (name_jh != NULL) {
1353 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1354 if (name == NULL) return 0; // a match is not possible
1355 }
1356 if (sig_jh != NULL) {
1357 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1358 if (sig == NULL) return 0; // a match is not possible
1359 }
1360
1361 Klass* caller = NULL;
1362 if (caller_jh != NULL) {
1363 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1364 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1365 caller = java_lang_Class::as_Klass(caller_oop);
1366 }
1367
1368 if (name != NULL && sig != NULL && results.not_null()) {
1369 // try a direct resolve
1370 // %%% TO DO
1371 }
1372
1373 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1374 caller, skip, results, CHECK_0);
1375 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1376 return res;
1377 }
1378 JVM_END
1379
1380 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1381 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1382 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1383 {
1384 // Walk all nmethods depending on this call site.
1385 MutexLocker mu(thread, Compile_lock);
1386 MethodHandles::flush_dependent_nmethods(call_site, target);
1387 java_lang_invoke_CallSite::set_target(call_site(), target());
1388 }
1389 }
1390 JVM_END
1391
1392 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1393 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1394 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1395 {
1396 // Walk all nmethods depending on this call site.
1397 MutexLocker mu(thread, Compile_lock);
1398 MethodHandles::flush_dependent_nmethods(call_site, target);
1399 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1400 }
1401 }
1402 JVM_END
1403
1404 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls,
1405 jobject caller_jh, jintArray index_info_jh,
1406 jint start, jint end,
1407 jobjectArray buf_jh, jint pos,
1408 jboolean resolve, jobject ifna_jh)) {
1409 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh));
1410 if (caller_k == NULL || !caller_k->is_instance_klass()) {
1411 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller");
1412 }
1413 InstanceKlass* caller = InstanceKlass::cast(caller_k);
1414 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh);
1415 if (index_info_oop == NULL ||
1416 index_info_oop->klass() != Universe::intArrayKlassObj() ||
1417 typeArrayOop(index_info_oop)->length() < 2) {
1418 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)");
1419 }
1420 typeArrayHandle index_info(THREAD, index_info_oop);
1421 int bss_index_in_pool = index_info->int_at(1);
1422 // While we are here, take a quick look at the index info:
1423 if (bss_index_in_pool <= 0 ||
1424 bss_index_in_pool >= caller->constants()->length() ||
1425 index_info->int_at(0)
1426 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) {
1427 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)");
1428 }
1429 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh));
1430 if (start < 0) {
1431 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) {
1432 if (start == pseudo_index) {
1433 if (start >= end || 0 > pos || pos >= buf->length()) break;
1434 oop pseudo_arg = NULL;
1435 switch (pseudo_index) {
1436 case -4: // bootstrap method
1437 {
1438 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool);
1439 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK);
1440 break;
1441 }
1442 case -3: // name
1443 {
1444 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool);
1445 Handle str = java_lang_String::create_from_symbol(name, CHECK);
1446 pseudo_arg = str();
1447 break;
1448 }
1449 case -2: // type
1450 {
1451 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool);
1452 Handle th;
1453 if (type->char_at(0) == JVM_SIGNATURE_FUNC) {
1454 th = SystemDictionary::find_method_handle_type(type, caller, CHECK);
1455 } else {
1456 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK);
1457 }
1458 pseudo_arg = th();
1459 break;
1460 }
1461 case -1: // argument count
1462 {
1463 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool);
1464 jvalue argc_value; argc_value.i = (jint)argc;
1465 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK);
1466 break;
1467 }
1468 }
1469
1470 // Store the pseudo-argument, and advance the pointers.
1471 buf->obj_at_put(pos++, pseudo_arg);
1472 ++start;
1473 }
1474 }
1475 // When we are done with this there may be regular arguments to process too.
1476 }
1477 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh));
1478 caller->constants()->
1479 copy_bootstrap_arguments_at(bss_index_in_pool,
1480 start, end, buf, pos,
1481 (resolve == JNI_TRUE), ifna, CHECK);
1482 }
1483 JVM_END
1484
1485 // It is called by a Cleaner object which ensures that dropped CallSites properly
1486 // deallocate their dependency information.
1487 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1488 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1489 {
1490 // Walk all nmethods depending on this call site.
1491 MutexLocker mu1(thread, Compile_lock);
1492
1493 int marked = 0;
1494 {
1495 NoSafepointVerifier nsv;
1496 MutexLocker mu2(THREAD, CodeCache_lock, Mutex::_no_safepoint_check_flag);
1497 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1498 marked = deps.remove_and_mark_for_deoptimization_all_dependents();
1499 }
1500 if (marked > 0) {
1501 // At least one nmethod has been marked for deoptimization
1502 Deoptimization::deoptimize_all_marked();
1503 }
1504 }
1505 }
1506 JVM_END
1507
1508 /**
1509 * Throws a java/lang/UnsupportedOperationException unconditionally.
1510 * This is required by the specification of MethodHandle.invoke if
1511 * invoked directly.
1512 */
1513 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1514 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1515 return NULL;
1516 }
1517 JVM_END
1518
1519 /**
1520 * Throws a java/lang/UnsupportedOperationException unconditionally.
1521 * This is required by the specification of MethodHandle.invokeExact if
1522 * invoked directly.
1523 */
1524 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1525 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1526 return NULL;
1527 }
1528 JVM_END
1529
1530 /// JVM_RegisterMethodHandleMethods
1531
1532 #define LANG "Ljava/lang/"
1533 #define JLINV "Ljava/lang/invoke/"
1534
1535 #define OBJ LANG "Object;"
1536 #define CLS LANG "Class;"
1537 #define STRG LANG "String;"
1538 #define CS JLINV "CallSite;"
1539 #define MT JLINV "MethodType;"
1540 #define MH JLINV "MethodHandle;"
1541 #define MEM JLINV "MemberName;"
1542 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1543
1544 #define CC (char*) /*cast a literal from (const char*)*/
1545 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1546
1547 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1548 static JNINativeMethod MHN_methods[] = {
1549 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1550 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1551 {CC "resolve", CC "(" MEM "" CLS "IZ)" MEM, FN_PTR(MHN_resolve_Mem)},
1552 // static native int getNamedCon(int which, Object[] name)
1553 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1554 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1555 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1556 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1557 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1558 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1559 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1560 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)},
1561 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1562 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1563 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1564 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1565 };
1566
1567 static JNINativeMethod MH_methods[] = {
1568 // UnsupportedOperationException throwers
1569 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1570 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1571 };
1572
1573 /**
1574 * This one function is exported, used by NativeLookup.
1575 */
1576 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1577 assert(!MethodHandles::enabled(), "must not be enabled");
1578 assert(vmClasses::MethodHandle_klass() != NULL, "should be present");
1579
1580 oop mirror = vmClasses::MethodHandle_klass()->java_mirror();
1581 jclass MH_class = (jclass) JNIHandles::make_local(THREAD, mirror);
1582
1583 {
1584 ThreadToNativeFromVM ttnfv(thread);
1585
1586 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1587 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1588 "register java.lang.invoke.MethodHandleNative natives");
1589
1590 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1591 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1592 "register java.lang.invoke.MethodHandle natives");
1593 }
1594
1595 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1596
1597 MethodHandles::set_enabled(true);
1598 }
1599 JVM_END