1 /*
2 * Copyright (c) 2008, 2010, 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 /*
26 * JSR 292 reference implementation: method handles
27 */
28
29 #include "incls/_precompiled.incl"
30 #include "incls/_methodHandles.cpp.incl"
31
32 bool MethodHandles::_enabled = false; // set true after successful native linkage
33
34 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL};
35 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = {
36 "raise_exception",
37 "invokestatic", // how a MH emulates invokestatic
38 "invokespecial", // ditto for the other invokes...
39 "invokevirtual",
40 "invokeinterface",
41 "bound_ref", // these are for BMH...
42 "bound_int",
43 "bound_long",
44 "bound_ref_direct", // (direct versions have a direct methodOop)
45 "bound_int_direct",
46 "bound_long_direct",
47
48 // starting at _adapter_mh_first:
49 "adapter_retype_only", // these are for AMH...
50 "adapter_retype_raw",
51 "adapter_check_cast",
52 "adapter_prim_to_prim",
53 "adapter_ref_to_prim",
54 "adapter_prim_to_ref",
55 "adapter_swap_args",
56 "adapter_rot_args",
57 "adapter_dup_args",
58 "adapter_drop_args",
59 "adapter_collect_args",
60 "adapter_spread_args",
61 "adapter_flyby",
62 "adapter_ricochet",
63
64 // optimized adapter types:
65 "adapter_swap_args/1",
66 "adapter_swap_args/2",
67 "adapter_rot_args/1,up",
68 "adapter_rot_args/1,down",
69 "adapter_rot_args/2,up",
70 "adapter_rot_args/2,down",
71 "adapter_prim_to_prim/i2i",
72 "adapter_prim_to_prim/l2i",
73 "adapter_prim_to_prim/d2f",
74 "adapter_prim_to_prim/i2l",
75 "adapter_prim_to_prim/f2d",
76 "adapter_ref_to_prim/unboxi",
77 "adapter_ref_to_prim/unboxl",
78 "adapter_spread_args/0",
79 "adapter_spread_args/1",
80 "adapter_spread_args/more",
81
82 NULL
83 };
84
85 // Adapters.
86 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
87 int MethodHandles::_adapter_code_size = StubRoutines::method_handles_adapters_code_size;
88
89 jobject MethodHandles::_raise_exception_method;
90
91 #ifdef ASSERT
92 bool MethodHandles::spot_check_entry_names() {
93 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), "");
94 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), "");
95 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), "");
96 assert(!strcmp(entry_name(_adapter_ricochet), "adapter_ricochet"), "");
97 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), "");
98 return true;
99 }
100 #endif
101
102
103 //------------------------------------------------------------------------------
104 // MethodHandles::generate_adapters
105 //
106 void MethodHandles::generate_adapters() {
107 if (!EnableMethodHandles || SystemDictionary::MethodHandle_klass() == NULL) return;
108
109 assert(_adapter_code == NULL, "generate only once");
110
111 ResourceMark rm;
112 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
113 _adapter_code = MethodHandlesAdapterBlob::create(_adapter_code_size);
114 if (_adapter_code == NULL)
115 vm_exit_out_of_memory(_adapter_code_size, "CodeCache: no room for MethodHandles adapters");
116 CodeBuffer code(_adapter_code);
117 MethodHandlesAdapterGenerator g(&code);
118 g.generate();
119 }
120
121
122 //------------------------------------------------------------------------------
123 // MethodHandlesAdapterGenerator::generate
124 //
125 void MethodHandlesAdapterGenerator::generate() {
126 // Generate generic method handle adapters.
127 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST;
128 ek < MethodHandles::_EK_LIMIT;
129 ek = MethodHandles::EntryKind(1 + (int)ek)) {
130 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek));
131 MethodHandles::generate_method_handle_stub(_masm, ek);
132 }
133 }
134
135
136 void MethodHandles::set_enabled(bool z) {
137 if (_enabled != z) {
138 guarantee(z && EnableMethodHandles, "can only enable once, and only if -XX:+EnableMethodHandles");
139 _enabled = z;
140 }
141 }
142
143 // Note: A method which does not have a TRAPS argument cannot block in the GC
144 // or throw exceptions. Such methods are used in this file to do something quick
145 // and local, like parse a data structure. For speed, such methods work on plain
146 // oops, not handles. Trapping methods uniformly operate on handles.
147
148 methodOop MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype,
149 klassOop& receiver_limit_result, int& decode_flags_result) {
150 if (vmtarget == NULL) return NULL;
151 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding");
152 if (vmindex < 0) {
153 // this DMH performs no dispatch; it is directly bound to a methodOop
154 // A MemberName may either be directly bound to a methodOop,
155 // or it may use the klass/index form; both forms mean the same thing.
156 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result);
157 if ((decode_flags_result & _dmf_has_receiver) != 0
158 && java_dyn_MethodType::is_instance(mtype)) {
159 // Extract receiver type restriction from mtype.ptypes[0].
160 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype);
161 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0);
162 if (java_lang_Class::is_instance(ptype0))
163 receiver_limit_result = java_lang_Class::as_klassOop(ptype0);
164 }
165 if (vmindex == methodOopDesc::nonvirtual_vtable_index) {
166 // this DMH can be an "invokespecial" version
167 decode_flags_result &= ~_dmf_does_dispatch;
168 } else {
169 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?");
170 }
171 return m;
172 } else {
173 assert(vmtarget->is_klass(), "must be class or interface");
174 decode_flags_result |= MethodHandles::_dmf_does_dispatch;
175 decode_flags_result |= MethodHandles::_dmf_has_receiver;
176 receiver_limit_result = (klassOop)vmtarget;
177 Klass* tk = Klass::cast((klassOop)vmtarget);
178 if (tk->is_interface()) {
179 // an itable linkage is <interface, itable index>
180 decode_flags_result |= MethodHandles::_dmf_from_interface;
181 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex);
182 } else {
183 if (!tk->oop_is_instance())
184 tk = instanceKlass::cast(SystemDictionary::Object_klass());
185 return ((instanceKlass*)tk)->method_at_vtable(vmindex);
186 }
187 }
188 }
189
190 // MemberName and DirectMethodHandle have the same linkage to the JVM internals.
191 // (MemberName is the non-operational name used for queries and setup.)
192
193 methodOop MethodHandles::decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
194 oop vmtarget = sun_dyn_DirectMethodHandle::vmtarget(mh);
195 int vmindex = sun_dyn_DirectMethodHandle::vmindex(mh);
196 oop mtype = sun_dyn_DirectMethodHandle::type(mh);
197 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result);
198 }
199
200 methodOop MethodHandles::decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
201 assert(sun_dyn_BoundMethodHandle::is_instance(mh), "");
202 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), "");
203 for (oop bmh = mh;;) {
204 // Bound MHs can be stacked to bind several arguments.
205 oop target = java_dyn_MethodHandle::vmtarget(bmh);
206 if (target == NULL) return NULL;
207 decode_flags_result |= MethodHandles::_dmf_binds_argument;
208 klassOop tk = target->klass();
209 if (tk == SystemDictionary::BoundMethodHandle_klass()) {
210 bmh = target;
211 continue;
212 } else {
213 if (java_dyn_MethodHandle::is_subclass(tk)) {
214 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH");
215 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
216 } else {
217 // Optimized case: binding a receiver to a non-dispatched DMH
218 // short-circuits directly to the methodOop.
219 // (It might be another argument besides a receiver also.)
220 assert(target->is_method(), "must be a simple method");
221 decode_flags_result |= MethodHandles::_dmf_binds_method;
222 methodOop m = (methodOop) target;
223 if (!m->is_static())
224 decode_flags_result |= MethodHandles::_dmf_has_receiver;
225 return m;
226 }
227 }
228 }
229 }
230
231 methodOop MethodHandles::decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
232 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), "");
233 for (oop amh = mh;;) {
234 // Adapter MHs can be stacked to convert several arguments.
235 int conv_op = adapter_conversion_op(sun_dyn_AdapterMethodHandle::conversion(amh));
236 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK;
237 oop target = java_dyn_MethodHandle::vmtarget(amh);
238 if (target == NULL) return NULL;
239 klassOop tk = target->klass();
240 if (tk == SystemDictionary::AdapterMethodHandle_klass()) {
241 amh = target;
242 continue;
243 } else {
244 // must be a BMH (which will bind some more arguments) or a DMH (for the final call)
245 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
246 }
247 }
248 }
249
250 methodOop MethodHandles::decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
251 if (mh == NULL) return NULL;
252 klassOop mhk = mh->klass();
253 assert(java_dyn_MethodHandle::is_subclass(mhk), "must be a MethodHandle");
254 if (mhk == SystemDictionary::DirectMethodHandle_klass()) {
255 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result);
256 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) {
257 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
258 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) {
259 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result);
260 } else if (sun_dyn_BoundMethodHandle::is_subclass(mhk)) {
261 // could be a JavaMethodHandle (but not an adapter MH)
262 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
263 } else {
264 assert(false, "cannot parse this MH");
265 return NULL; // random MH?
266 }
267 }
268
269 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) {
270 assert(m->is_method(), "");
271 if (m->is_static()) {
272 // check that signature begins '(L' or '([' (not '(I', '()', etc.)
273 symbolOop sig = m->signature();
274 BasicType recv_bt = char2type(sig->byte_at(1));
275 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')'
276 assert(sig->byte_at(0) == '(', "must be method sig");
277 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY)
278 // decode_flags_result |= _dmf_has_receiver;
279 } else {
280 // non-static method
281 decode_flags_result |= _dmf_has_receiver;
282 if (!m->can_be_statically_bound() && !m->is_initializer()) {
283 decode_flags_result |= _dmf_does_dispatch;
284 if (Klass::cast(m->method_holder())->is_interface())
285 decode_flags_result |= _dmf_from_interface;
286 }
287 }
288 return m;
289 }
290
291
292 // A trusted party is handing us a cookie to determine a method.
293 // Let's boil it down to the method oop they really want.
294 methodOop MethodHandles::decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result) {
295 decode_flags_result = 0;
296 receiver_limit_result = NULL;
297 klassOop xk = x->klass();
298 if (xk == Universe::methodKlassObj()) {
299 return decode_methodOop((methodOop) x, decode_flags_result);
300 } else if (xk == SystemDictionary::MemberName_klass()) {
301 // Note: This only works if the MemberName has already been resolved.
302 return decode_MemberName(x, receiver_limit_result, decode_flags_result);
303 } else if (java_dyn_MethodHandle::is_subclass(xk)) {
304 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result);
305 } else if (xk == SystemDictionary::reflect_Method_klass()) {
306 oop clazz = java_lang_reflect_Method::clazz(x);
307 int slot = java_lang_reflect_Method::slot(x);
308 klassOop k = java_lang_Class::as_klassOop(clazz);
309 if (k != NULL && Klass::cast(k)->oop_is_instance())
310 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
311 decode_flags_result);
312 } else if (xk == SystemDictionary::reflect_Constructor_klass()) {
313 oop clazz = java_lang_reflect_Constructor::clazz(x);
314 int slot = java_lang_reflect_Constructor::slot(x);
315 klassOop k = java_lang_Class::as_klassOop(clazz);
316 if (k != NULL && Klass::cast(k)->oop_is_instance())
317 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
318 decode_flags_result);
319 } else {
320 // unrecognized object
321 assert(!x->is_method(), "already checked");
322 assert(!sun_dyn_MemberName::is_instance(x), "already checked");
323 }
324 return NULL;
325 }
326
327
328 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) {
329 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass())
330 return 0; // no push/pop
331 int this_vmslots = java_dyn_MethodHandle::vmslots(mh);
332 int last_vmslots = 0;
333 oop last_mh = mh;
334 for (;;) {
335 oop target = java_dyn_MethodHandle::vmtarget(last_mh);
336 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
337 last_vmslots = java_dyn_MethodHandle::vmslots(target);
338 break;
339 } else if (!java_dyn_MethodHandle::is_instance(target)) {
340 // might be klass or method
341 assert(target->is_method(), "must get here with a direct ref to method");
342 last_vmslots = methodOop(target)->size_of_parameters();
343 break;
344 }
345 last_mh = target;
346 }
347 // If I am called with fewer VM slots than my ultimate callee,
348 // it must be that I push the additionally needed slots.
349 // Likewise if am called with more VM slots, I will pop them.
350 return (last_vmslots - this_vmslots);
351 }
352
353
354 // MemberName support
355
356 // import sun_dyn_MemberName.*
357 enum {
358 IS_METHOD = sun_dyn_MemberName::MN_IS_METHOD,
359 IS_CONSTRUCTOR = sun_dyn_MemberName::MN_IS_CONSTRUCTOR,
360 IS_FIELD = sun_dyn_MemberName::MN_IS_FIELD,
361 IS_TYPE = sun_dyn_MemberName::MN_IS_TYPE,
362 SEARCH_SUPERCLASSES = sun_dyn_MemberName::MN_SEARCH_SUPERCLASSES,
363 SEARCH_INTERFACES = sun_dyn_MemberName::MN_SEARCH_INTERFACES,
364 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE,
365 VM_INDEX_UNINITIALIZED = sun_dyn_MemberName::VM_INDEX_UNINITIALIZED
366 };
367
368 Handle MethodHandles::new_MemberName(TRAPS) {
369 Handle empty;
370 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
371 if (!k->is_initialized()) k->initialize(CHECK_(empty));
372 return Handle(THREAD, k->allocate_instance(THREAD));
373 }
374
375 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) {
376 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) {
377 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
378 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
379 int mods = java_lang_reflect_Field::modifiers(target_oop);
380 klassOop k = java_lang_Class::as_klassOop(clazz);
381 int offset = instanceKlass::cast(k)->offset_from_fields(slot);
382 init_MemberName(mname_oop, k, accessFlags_from(mods), offset);
383 } else {
384 int decode_flags = 0; klassOop receiver_limit = NULL;
385 methodOop m = MethodHandles::decode_method(target_oop,
386 receiver_limit, decode_flags);
387 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
388 init_MemberName(mname_oop, m, do_dispatch);
389 }
390 }
391
392 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) {
393 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD)
394 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ));
395 oop vmtarget = m;
396 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet
397 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound())
398 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch
399 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value");
400 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget);
401 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex);
402 sun_dyn_MemberName::set_flags(mname_oop, flags);
403 sun_dyn_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror());
404 }
405
406 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) {
407 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ));
408 oop vmtarget = field_holder;
409 int vmindex = offset; // determines the field uniquely when combined with static bit
410 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex");
411 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget);
412 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex);
413 sun_dyn_MemberName::set_flags(mname_oop, flags);
414 sun_dyn_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror());
415 }
416
417
418 methodOop MethodHandles::decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result) {
419 int flags = sun_dyn_MemberName::flags(mname);
420 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return NULL; // not invocable
421 oop vmtarget = sun_dyn_MemberName::vmtarget(mname);
422 int vmindex = sun_dyn_MemberName::vmindex(mname);
423 if (vmindex == VM_INDEX_UNINITIALIZED) return NULL; // not resolved
424 methodOop m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result);
425 oop clazz = sun_dyn_MemberName::clazz(mname);
426 if (clazz != NULL && java_lang_Class::is_instance(clazz)) {
427 klassOop klass = java_lang_Class::as_klassOop(clazz);
428 if (klass != NULL) receiver_limit_result = klass;
429 }
430 return m;
431 }
432
433 // An unresolved member name is a mere symbolic reference.
434 // Resolving it plants a vmtarget/vmindex in it,
435 // which refers dirctly to JVM internals.
436 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
437 assert(sun_dyn_MemberName::is_instance(mname()), "");
438 #ifdef ASSERT
439 // If this assert throws, renegotiate the sentinel value used by the Java code,
440 // so that it is distinct from any valid vtable index value, and any special
441 // values defined in methodOopDesc::VtableIndexFlag.
442 // The point of the slop is to give the Java code and the JVM some room
443 // to independently specify sentinel values.
444 const int sentinel_slop = 10;
445 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop;
446 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels");
447 #endif
448 if (sun_dyn_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED)
449 return; // already resolved
450 oop defc_oop = sun_dyn_MemberName::clazz(mname());
451 oop name_str = sun_dyn_MemberName::name(mname());
452 oop type_str = sun_dyn_MemberName::type(mname());
453 int flags = sun_dyn_MemberName::flags(mname());
454
455 if (defc_oop == NULL || name_str == NULL || type_str == NULL) {
456 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve");
457 }
458 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop);
459 defc_oop = NULL; // safety
460 if (defc_klassOop == NULL) return; // a primitive; no resolution possible
461 if (!Klass::cast(defc_klassOop)->oop_is_instance()) {
462 if (!Klass::cast(defc_klassOop)->oop_is_array()) return;
463 defc_klassOop = SystemDictionary::Object_klass();
464 }
465 instanceKlassHandle defc(THREAD, defc_klassOop);
466 defc_klassOop = NULL; // safety
467 if (defc.is_null()) {
468 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class");
469 }
470 defc->link_class(CHECK);
471
472 // convert the external string name to an internal symbol
473 symbolHandle name(THREAD, java_lang_String::as_symbol_or_null(name_str));
474 if (name.is_null()) return; // no such name
475 name_str = NULL; // safety
476
477 Handle polymorphic_method_type;
478 bool polymorphic_signature = false;
479 if ((flags & ALL_KINDS) == IS_METHOD &&
480 (defc() == SystemDictionary::InvokeDynamic_klass() ||
481 (defc() == SystemDictionary::MethodHandle_klass() &&
482 methodOopDesc::is_method_handle_invoke_name(name()))))
483 polymorphic_signature = true;
484
485 // convert the external string or reflective type to an internal signature
486 symbolHandle type; {
487 symbolOop type_sym = NULL;
488 if (java_dyn_MethodType::is_instance(type_str)) {
489 type_sym = java_dyn_MethodType::as_signature(type_str, polymorphic_signature, CHECK);
490 if (polymorphic_signature)
491 polymorphic_method_type = Handle(THREAD, type_str); //preserve exactly
492 } else if (java_lang_Class::is_instance(type_str)) {
493 type_sym = java_lang_Class::as_signature(type_str, false, CHECK);
494 } else if (java_lang_String::is_instance(type_str)) {
495 if (polymorphic_signature) {
496 type = java_lang_String::as_symbol(type_str, CHECK);
497 } else {
498 type_sym = java_lang_String::as_symbol_or_null(type_str);
499 }
500 } else {
501 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized type");
502 }
503 if (type_sym != NULL)
504 type = symbolHandle(THREAD, type_sym);
505 }
506 if (type.is_null()) return; // no such signature exists in the VM
507 type_str = NULL; // safety
508
509 // Time to do the lookup.
510 switch (flags & ALL_KINDS) {
511 case IS_METHOD:
512 {
513 CallInfo result;
514 {
515 EXCEPTION_MARK;
516 if ((flags & JVM_ACC_STATIC) != 0) {
517 LinkResolver::resolve_static_call(result,
518 defc, name, type, KlassHandle(), false, false, THREAD);
519 } else if (defc->is_interface()) {
520 LinkResolver::resolve_interface_call(result, Handle(), defc,
521 defc, name, type, KlassHandle(), false, false, THREAD);
522 } else {
523 LinkResolver::resolve_virtual_call(result, Handle(), defc,
524 defc, name, type, KlassHandle(), false, false, THREAD);
525 }
526 if (HAS_PENDING_EXCEPTION) {
527 CLEAR_PENDING_EXCEPTION;
528 break; // go to second chance
529 }
530 }
531 methodHandle m = result.resolved_method();
532 oop vmtarget = NULL;
533 int vmindex = methodOopDesc::nonvirtual_vtable_index;
534 if (defc->is_interface()) {
535 vmindex = klassItable::compute_itable_index(m());
536 assert(vmindex >= 0, "");
537 } else if (result.has_vtable_index()) {
538 vmindex = result.vtable_index();
539 assert(vmindex >= 0, "");
540 }
541 assert(vmindex != VM_INDEX_UNINITIALIZED, "");
542 if (vmindex < 0) {
543 assert(result.is_statically_bound(), "");
544 vmtarget = m();
545 } else {
546 vmtarget = result.resolved_klass()->as_klassOop();
547 }
548 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
549 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget);
550 sun_dyn_MemberName::set_vmindex(mname(), vmindex);
551 sun_dyn_MemberName::set_modifiers(mname(), mods);
552 DEBUG_ONLY(int junk; klassOop junk2);
553 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(),
554 "properly stored for later decoding");
555 return;
556 }
557 case IS_CONSTRUCTOR:
558 {
559 CallInfo result;
560 {
561 EXCEPTION_MARK;
562 if (name() == vmSymbols::object_initializer_name()) {
563 LinkResolver::resolve_special_call(result,
564 defc, name, type, KlassHandle(), false, THREAD);
565 } else {
566 break; // will throw after end of switch
567 }
568 if (HAS_PENDING_EXCEPTION) {
569 CLEAR_PENDING_EXCEPTION;
570 return;
571 }
572 }
573 assert(result.is_statically_bound(), "");
574 methodHandle m = result.resolved_method();
575 oop vmtarget = m();
576 int vmindex = methodOopDesc::nonvirtual_vtable_index;
577 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
578 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget);
579 sun_dyn_MemberName::set_vmindex(mname(), vmindex);
580 sun_dyn_MemberName::set_modifiers(mname(), mods);
581 DEBUG_ONLY(int junk; klassOop junk2);
582 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(),
583 "properly stored for later decoding");
584 return;
585 }
586 case IS_FIELD:
587 {
588 // This is taken from LinkResolver::resolve_field, sans access checks.
589 fieldDescriptor fd; // find_field initializes fd if found
590 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name(), type(), &fd));
591 // check if field exists; i.e., if a klass containing the field def has been selected
592 if (sel_klass.is_null()) return;
593 oop vmtarget = sel_klass->as_klassOop();
594 int vmindex = fd.offset();
595 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS);
596 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen
597 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget);
598 sun_dyn_MemberName::set_vmindex(mname(), vmindex);
599 sun_dyn_MemberName::set_modifiers(mname(), mods);
600 return;
601 }
602 default:
603 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
604 }
605
606 // Second chance.
607 if (polymorphic_method_type.not_null()) {
608 // Look on a non-null class loader.
609 Handle cur_class_loader;
610 const int nptypes = java_dyn_MethodType::ptype_count(polymorphic_method_type());
611 for (int i = 0; i <= nptypes; i++) {
612 oop type_mirror;
613 if (i < nptypes) type_mirror = java_dyn_MethodType::ptype(polymorphic_method_type(), i);
614 else type_mirror = java_dyn_MethodType::rtype(polymorphic_method_type());
615 klassOop example_type = java_lang_Class::as_klassOop(type_mirror);
616 if (example_type == NULL) continue;
617 oop class_loader = Klass::cast(example_type)->class_loader();
618 if (class_loader == NULL || class_loader == cur_class_loader()) continue;
619 cur_class_loader = Handle(THREAD, class_loader);
620 methodOop m = SystemDictionary::find_method_handle_invoke(name,
621 type,
622 KlassHandle(THREAD, example_type),
623 THREAD);
624 if (HAS_PENDING_EXCEPTION) {
625 CLEAR_PENDING_EXCEPTION;
626 m = NULL;
627 // try again with a different class loader...
628 }
629 if (m != NULL) {
630 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
631 sun_dyn_MemberName::set_vmtarget(mname(), m);
632 sun_dyn_MemberName::set_vmindex(mname(), m->vtable_index());
633 sun_dyn_MemberName::set_modifiers(mname(), mods);
634 return;
635 }
636 }
637 }
638 }
639
640 // Conversely, a member name which is only initialized from JVM internals
641 // may have null defc, name, and type fields.
642 // Resolving it plants a vmtarget/vmindex in it,
643 // which refers directly to JVM internals.
644 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
645 assert(sun_dyn_MemberName::is_instance(mname()), "");
646 oop vmtarget = sun_dyn_MemberName::vmtarget(mname());
647 int vmindex = sun_dyn_MemberName::vmindex(mname());
648 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) {
649 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
650 }
651
652 bool have_defc = (sun_dyn_MemberName::clazz(mname()) != NULL);
653 bool have_name = (sun_dyn_MemberName::name(mname()) != NULL);
654 bool have_type = (sun_dyn_MemberName::type(mname()) != NULL);
655 int flags = sun_dyn_MemberName::flags(mname());
656
657 if (suppress != 0) {
658 if (suppress & _suppress_defc) have_defc = true;
659 if (suppress & _suppress_name) have_name = true;
660 if (suppress & _suppress_type) have_type = true;
661 }
662
663 if (have_defc && have_name && have_type) return; // nothing needed
664
665 switch (flags & ALL_KINDS) {
666 case IS_METHOD:
667 case IS_CONSTRUCTOR:
668 {
669 klassOop receiver_limit = NULL;
670 int decode_flags = 0;
671 methodHandle m(THREAD, decode_vmtarget(vmtarget, vmindex, NULL,
672 receiver_limit, decode_flags));
673 if (m.is_null()) break;
674 if (!have_defc) {
675 klassOop defc = m->method_holder();
676 if (receiver_limit != NULL && receiver_limit != defc
677 && Klass::cast(receiver_limit)->is_subtype_of(defc))
678 defc = receiver_limit;
679 sun_dyn_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror());
680 }
681 if (!have_name) {
682 //not java_lang_String::create_from_symbol; let's intern member names
683 Handle name = StringTable::intern(m->name(), CHECK);
684 sun_dyn_MemberName::set_name(mname(), name());
685 }
686 if (!have_type) {
687 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
688 sun_dyn_MemberName::set_type(mname(), type());
689 }
690 return;
691 }
692 case IS_FIELD:
693 {
694 // This is taken from LinkResolver::resolve_field, sans access checks.
695 if (!vmtarget->is_klass()) break;
696 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break;
697 instanceKlassHandle defc(THREAD, (klassOop) vmtarget);
698 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
699 fieldDescriptor fd; // find_field initializes fd if found
700 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
701 break; // cannot expand
702 if (!have_defc) {
703 sun_dyn_MemberName::set_clazz(mname(), defc->java_mirror());
704 }
705 if (!have_name) {
706 //not java_lang_String::create_from_symbol; let's intern member names
707 Handle name = StringTable::intern(fd.name(), CHECK);
708 sun_dyn_MemberName::set_name(mname(), name());
709 }
710 if (!have_type) {
711 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
712 sun_dyn_MemberName::set_type(mname(), type());
713 }
714 return;
715 }
716 }
717 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
718 }
719
720 int MethodHandles::find_MemberNames(klassOop k,
721 symbolOop name, symbolOop sig,
722 int mflags, klassOop caller,
723 int skip, objArrayOop results) {
724 DEBUG_ONLY(No_Safepoint_Verifier nsv);
725 // this code contains no safepoints!
726
727 // %%% take caller into account!
728
729 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1;
730
731 int rfill = 0, rlimit = results->length(), rskip = skip;
732 // overflow measurement:
733 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
734
735 int match_flags = mflags;
736 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
737 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
738 bool local_only = !(search_superc | search_intfc);
739 bool classes_only = false;
740
741 if (name != NULL) {
742 if (name->utf8_length() == 0) return 0; // a match is not possible
743 }
744 if (sig != NULL) {
745 if (sig->utf8_length() == 0) return 0; // a match is not possible
746 if (sig->byte_at(0) == '(')
747 match_flags &= ~(IS_FIELD | IS_TYPE);
748 else
749 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
750 }
751
752 if ((match_flags & IS_TYPE) != 0) {
753 // NYI, and Core Reflection works quite well for this query
754 }
755
756 if ((match_flags & IS_FIELD) != 0) {
757 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
758 if (name != NULL && st.name() != name)
759 continue;
760 if (sig != NULL && st.signature() != sig)
761 continue;
762 // passed the filters
763 if (rskip > 0) {
764 --rskip;
765 } else if (rfill < rlimit) {
766 oop result = results->obj_at(rfill++);
767 if (!sun_dyn_MemberName::is_instance(result))
768 return -99; // caller bug!
769 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset());
770 } else if (++overflow >= overflow_limit) {
771 match_flags = 0; break; // got tired of looking at overflow
772 }
773 }
774 }
775
776 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
777 // watch out for these guys:
778 symbolOop init_name = vmSymbols::object_initializer_name();
779 symbolOop clinit_name = vmSymbols::class_initializer_name();
780 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
781 bool negate_name_test = false;
782 // fix name so that it captures the intention of IS_CONSTRUCTOR
783 if (!(match_flags & IS_METHOD)) {
784 // constructors only
785 if (name == NULL) {
786 name = init_name;
787 } else if (name != init_name) {
788 return 0; // no constructors of this method name
789 }
790 } else if (!(match_flags & IS_CONSTRUCTOR)) {
791 // methods only
792 if (name == NULL) {
793 name = init_name;
794 negate_name_test = true; // if we see the name, we *omit* the entry
795 } else if (name == init_name) {
796 return 0; // no methods of this constructor name
797 }
798 } else {
799 // caller will accept either sort; no need to adjust name
800 }
801 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
802 methodOop m = st.method();
803 symbolOop m_name = m->name();
804 if (m_name == clinit_name)
805 continue;
806 if (name != NULL && ((m_name != name) ^ negate_name_test))
807 continue;
808 if (sig != NULL && m->signature() != sig)
809 continue;
810 // passed the filters
811 if (rskip > 0) {
812 --rskip;
813 } else if (rfill < rlimit) {
814 oop result = results->obj_at(rfill++);
815 if (!sun_dyn_MemberName::is_instance(result))
816 return -99; // caller bug!
817 MethodHandles::init_MemberName(result, m, true);
818 } else if (++overflow >= overflow_limit) {
819 match_flags = 0; break; // got tired of looking at overflow
820 }
821 }
822 }
823
824 // return number of elements we at leasted wanted to initialize
825 return rfill + overflow;
826 }
827
828
829 // Decode this java.lang.Class object into an instanceKlass, if possible.
830 // Throw IAE if not
831 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) {
832 instanceKlassHandle empty;
833 klassOop caller = NULL;
834 if (java_lang_Class::is_instance(java_mirror_oop)) {
835 caller = java_lang_Class::as_klassOop(java_mirror_oop);
836 }
837 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) {
838 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty);
839 }
840 return instanceKlassHandle(THREAD, caller);
841 }
842
843
844
845 // Decode the vmtarget field of a method handle.
846 // Sanitize out methodOops, klassOops, and any other non-Java data.
847 // This is for debugging and reflection.
848 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) {
849 assert(java_dyn_MethodHandle::is_instance(mh()), "must be a MH");
850 if (format == ETF_HANDLE_OR_METHOD_NAME) {
851 oop target = java_dyn_MethodHandle::vmtarget(mh());
852 if (target == NULL) {
853 return NULL; // unformed MH
854 }
855 klassOop tklass = target->klass();
856 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) {
857 return target; // target is another MH (or something else?)
858 }
859 }
860 if (format == ETF_DIRECT_HANDLE) {
861 oop target = mh();
862 for (;;) {
863 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
864 return target;
865 }
866 if (!java_dyn_MethodHandle::is_instance(target)){
867 return NULL; // unformed MH
868 }
869 target = java_dyn_MethodHandle::vmtarget(target);
870 }
871 }
872 // cases of metadata in MH.vmtarget:
873 // - AMH can have methodOop for static invoke with bound receiver
874 // - DMH can have methodOop for static invoke (on variable receiver)
875 // - DMH can have klassOop for dispatched (non-static) invoke
876 klassOop receiver_limit = NULL;
877 int decode_flags = 0;
878 methodOop m = decode_MethodHandle(mh(), receiver_limit, decode_flags);
879 if (m == NULL) return NULL;
880 switch (format) {
881 case ETF_REFLECT_METHOD:
882 // same as jni_ToReflectedMethod:
883 if (m->is_initializer()) {
884 return Reflection::new_constructor(m, THREAD);
885 } else {
886 return Reflection::new_method(m, UseNewReflection, false, THREAD);
887 }
888
889 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle
890 case ETF_METHOD_NAME:
891 {
892 if (SystemDictionary::MemberName_klass() == NULL) break;
893 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass());
894 mname_klass->initialize(CHECK_NULL);
895 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL);
896 sun_dyn_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED);
897 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
898 init_MemberName(mname(), m, do_dispatch);
899 expand_MemberName(mname, 0, CHECK_NULL);
900 return mname();
901 }
902 }
903
904 // Unknown format code.
905 char msg[50];
906 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format);
907 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg);
908 }
909
910 static const char* always_null_names[] = {
911 "java/lang/Void",
912 "java/lang/Null",
913 //"java/lang/Nothing",
914 "sun/dyn/empty/Empty",
915 NULL
916 };
917
918 static bool is_always_null_type(klassOop klass) {
919 if (!Klass::cast(klass)->oop_is_instance()) return false;
920 instanceKlass* ik = instanceKlass::cast(klass);
921 // Must be on the boot class path:
922 if (ik->class_loader() != NULL) return false;
923 // Check the name.
924 symbolOop name = ik->name();
925 for (int i = 0; ; i++) {
926 const char* test_name = always_null_names[i];
927 if (test_name == NULL) break;
928 if (name->equals(test_name))
929 return true;
930 }
931 return false;
932 }
933
934 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) {
935 if (src == dst || dst == SystemDictionary::Object_klass())
936 return false; // quickest checks
937 Klass* srck = Klass::cast(src);
938 Klass* dstk = Klass::cast(dst);
939 if (dstk->is_interface()) {
940 // interface receivers can safely be viewed as untyped,
941 // because interface calls always include a dynamic check
942 //dstk = Klass::cast(SystemDictionary::Object_klass());
943 return false;
944 }
945 if (srck->is_interface()) {
946 // interface arguments must be viewed as untyped
947 //srck = Klass::cast(SystemDictionary::Object_klass());
948 return true;
949 }
950 if (is_always_null_type(src)) {
951 // some source types are known to be never instantiated;
952 // they represent references which are always null
953 // such null references never fail to convert safely
954 return false;
955 }
956 return !srck->is_subclass_of(dstk->as_klassOop());
957 }
958
959 static oop object_java_mirror() {
960 return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
961 }
962
963 bool MethodHandles::same_basic_type_for_arguments(BasicType src,
964 BasicType dst,
965 bool raw,
966 bool for_return) {
967 if (for_return) {
968 // return values can always be forgotten:
969 if (dst == T_VOID) return true;
970 if (src == T_VOID) return raw && (dst == T_INT);
971 // We allow caller to receive a garbage int, which is harmless.
972 // This trick is pulled by trusted code (see VerifyType.canPassRaw).
973 }
974 assert(src != T_VOID && dst != T_VOID, "should not be here");
975 if (src == dst) return true;
976 if (type2size[src] != type2size[dst]) return false;
977 // allow reinterpretation casts for integral widening
978 if (is_subword_type(src)) { // subwords can fit in int or other subwords
979 if (dst == T_INT) // any subword fits in an int
980 return true;
981 if (src == T_BOOLEAN) // boolean fits in any subword
982 return is_subword_type(dst);
983 if (src == T_BYTE && dst == T_SHORT)
984 return true; // remaining case: byte fits in short
985 }
986 // allow float/fixed reinterpretation casts
987 if (src == T_FLOAT) return dst == T_INT;
988 if (src == T_INT) return dst == T_FLOAT;
989 if (src == T_DOUBLE) return dst == T_LONG;
990 if (src == T_LONG) return dst == T_DOUBLE;
991 return false;
992 }
993
994 const char* MethodHandles::check_method_receiver(methodOop m,
995 klassOop passed_recv_type) {
996 assert(!m->is_static(), "caller resp.");
997 if (passed_recv_type == NULL)
998 return "receiver type is primitive";
999 if (class_cast_needed(passed_recv_type, m->method_holder())) {
1000 Klass* formal = Klass::cast(m->method_holder());
1001 return SharedRuntime::generate_class_cast_message("receiver type",
1002 formal->external_name());
1003 }
1004 return NULL; // checks passed
1005 }
1006
1007 // Verify that m's signature can be called type-safely by a method handle
1008 // of the given method type 'mtype'.
1009 // It takes a TRAPS argument because it must perform symbol lookups.
1010 void MethodHandles::verify_method_signature(methodHandle m,
1011 Handle mtype,
1012 int first_ptype_pos,
1013 KlassHandle insert_ptype,
1014 TRAPS) {
1015 objArrayHandle ptypes(THREAD, java_dyn_MethodType::ptypes(mtype()));
1016 int pnum = first_ptype_pos;
1017 int pmax = ptypes->length();
1018 int mnum = 0; // method argument
1019 const char* err = NULL;
1020 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
1021 oop ptype_oop = NULL;
1022 if (ss.at_return_type()) {
1023 if (pnum != pmax)
1024 { err = "too many arguments"; break; }
1025 ptype_oop = java_dyn_MethodType::rtype(mtype());
1026 } else {
1027 if (pnum >= pmax)
1028 { err = "not enough arguments"; break; }
1029 if (pnum >= 0)
1030 ptype_oop = ptypes->obj_at(pnum);
1031 else if (insert_ptype.is_null())
1032 ptype_oop = NULL;
1033 else
1034 ptype_oop = insert_ptype->java_mirror();
1035 pnum += 1;
1036 mnum += 1;
1037 }
1038 klassOop pklass = NULL;
1039 BasicType ptype = T_OBJECT;
1040 if (ptype_oop != NULL)
1041 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass);
1042 else
1043 // null does not match any non-reference; use Object to report the error
1044 pklass = SystemDictionary::Object_klass();
1045 klassOop mklass = NULL;
1046 BasicType mtype = ss.type();
1047 if (mtype == T_ARRAY) mtype = T_OBJECT; // fold all refs to T_OBJECT
1048 if (mtype == T_OBJECT) {
1049 if (ptype_oop == NULL) {
1050 // null matches any reference
1051 continue;
1052 }
1053 KlassHandle pklass_handle(THREAD, pklass); pklass = NULL;
1054 // If we fail to resolve types at this point, we will throw an error.
1055 symbolOop name_oop = ss.as_symbol(CHECK);
1056 symbolHandle name(THREAD, name_oop);
1057 instanceKlass* mk = instanceKlass::cast(m->method_holder());
1058 Handle loader(THREAD, mk->class_loader());
1059 Handle domain(THREAD, mk->protection_domain());
1060 mklass = SystemDictionary::resolve_or_null(name, loader, domain, CHECK);
1061 pklass = pklass_handle();
1062 if (mklass == NULL && pklass != NULL &&
1063 Klass::cast(pklass)->name() == name() &&
1064 m->is_method_handle_invoke()) {
1065 // Assume a match. We can't really decode the signature of MH.invoke*.
1066 continue;
1067 }
1068 }
1069 if (!ss.at_return_type()) {
1070 err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum);
1071 } else {
1072 err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal!
1073 }
1074 if (err != NULL) break;
1075 }
1076
1077 if (err != NULL) {
1078 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1079 }
1080 }
1081
1082 // Main routine for verifying the MethodHandle.type of a proposed
1083 // direct or bound-direct method handle.
1084 void MethodHandles::verify_method_type(methodHandle m,
1085 Handle mtype,
1086 bool has_bound_recv,
1087 KlassHandle bound_recv_type,
1088 TRAPS) {
1089 bool m_needs_receiver = !m->is_static();
1090
1091 const char* err = NULL;
1092
1093 int first_ptype_pos = m_needs_receiver ? 1 : 0;
1094 if (has_bound_recv) {
1095 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them
1096 if (m_needs_receiver && bound_recv_type.is_null())
1097 { err = "bound receiver is not an object"; goto die; }
1098 }
1099
1100 if (m_needs_receiver && err == NULL) {
1101 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype());
1102 if (ptypes->length() < first_ptype_pos)
1103 { err = "receiver argument is missing"; goto die; }
1104 if (has_bound_recv)
1105 err = check_method_receiver(m(), bound_recv_type->as_klassOop());
1106 else
1107 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1)));
1108 if (err != NULL) goto die;
1109 }
1110
1111 // Check the other arguments for mistypes.
1112 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK);
1113 return;
1114
1115 die:
1116 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1117 }
1118
1119 void MethodHandles::verify_vmslots(Handle mh, TRAPS) {
1120 // Verify vmslots.
1121 int check_slots = argument_slot_count(java_dyn_MethodHandle::type(mh()));
1122 if (java_dyn_MethodHandle::vmslots(mh()) != check_slots) {
1123 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH");
1124 }
1125 }
1126
1127 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) {
1128 // Verify that argslot points at the given argnum.
1129 int check_slot = argument_slot(java_dyn_MethodHandle::type(mh()), argnum);
1130 if (argslot != check_slot || argslot < 0) {
1131 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d";
1132 size_t msglen = strlen(fmt) + 3*11 + 1;
1133 char* msg = NEW_RESOURCE_ARRAY(char, msglen);
1134 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot);
1135 THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
1136 }
1137 }
1138
1139 // Verify the correspondence between two method types.
1140 // Apart from the advertised changes, caller method type X must
1141 // be able to invoke the callee method Y type with no violations
1142 // of type integrity.
1143 // Return NULL if all is well, else a short error message.
1144 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end,
1145 int insert_argnum, oop insert_type,
1146 int change_argnum, oop change_type,
1147 int delete_argnum,
1148 oop dst_mtype, int dst_beg, int dst_end,
1149 bool raw) {
1150 objArrayOop src_ptypes = java_dyn_MethodType::ptypes(src_mtype);
1151 objArrayOop dst_ptypes = java_dyn_MethodType::ptypes(dst_mtype);
1152
1153 int src_max = src_ptypes->length();
1154 int dst_max = dst_ptypes->length();
1155
1156 if (src_end == -1) src_end = src_max;
1157 if (dst_end == -1) dst_end = dst_max;
1158
1159 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob");
1160 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob");
1161
1162 // pending actions; set to -1 when done:
1163 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum;
1164
1165 const char* err = NULL;
1166
1167 // Walk along each array of parameter types, including a virtual
1168 // NULL end marker at the end of each.
1169 for (int src_idx = src_beg, dst_idx = dst_beg;
1170 (src_idx <= src_end && dst_idx <= dst_end);
1171 src_idx++, dst_idx++) {
1172 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx);
1173 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx);
1174 bool fix_null_src_type = false;
1175
1176 // Perform requested edits.
1177 if (ins_idx == src_idx) {
1178 // note that the inserted guy is never affected by a change or deletion
1179 ins_idx = -1;
1180 src_type = insert_type;
1181 fix_null_src_type = true;
1182 --src_idx; // back up to process src type on next loop
1183 src_idx = src_end;
1184 } else {
1185 // note that the changed guy can be immediately deleted
1186 if (chg_idx == src_idx) {
1187 chg_idx = -1;
1188 assert(src_idx < src_end, "oob");
1189 src_type = change_type;
1190 fix_null_src_type = true;
1191 }
1192 if (del_idx == src_idx) {
1193 del_idx = -1;
1194 assert(src_idx < src_end, "oob");
1195 --dst_idx;
1196 continue; // rerun loop after skipping this position
1197 }
1198 }
1199
1200 if (src_type == NULL && fix_null_src_type)
1201 // explicit null in this case matches any dest reference
1202 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type);
1203
1204 // Compare the two argument types.
1205 if (src_type != dst_type) {
1206 if (src_type == NULL) return "not enough arguments";
1207 if (dst_type == NULL) return "too many arguments";
1208 err = check_argument_type_change(src_type, dst_type, dst_idx, raw);
1209 if (err != NULL) return err;
1210 }
1211 }
1212
1213 // Now compare return types also.
1214 oop src_rtype = java_dyn_MethodType::rtype(src_mtype);
1215 oop dst_rtype = java_dyn_MethodType::rtype(dst_mtype);
1216 if (src_rtype != dst_rtype) {
1217 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal!
1218 if (err != NULL) return err;
1219 }
1220
1221 assert(err == NULL, "");
1222 return NULL; // all is well
1223 }
1224
1225
1226 const char* MethodHandles::check_argument_type_change(BasicType src_type,
1227 klassOop src_klass,
1228 BasicType dst_type,
1229 klassOop dst_klass,
1230 int argnum,
1231 bool raw) {
1232 const char* err = NULL;
1233 bool for_return = (argnum < 0);
1234
1235 // just in case:
1236 if (src_type == T_ARRAY) src_type = T_OBJECT;
1237 if (dst_type == T_ARRAY) dst_type = T_OBJECT;
1238
1239 // Produce some nice messages if VerifyMethodHandles is turned on:
1240 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) {
1241 if (src_type == T_OBJECT) {
1242 if (raw && dst_type == T_INT && is_always_null_type(src_klass))
1243 return NULL; // OK to convert a null pointer to a garbage int
1244 err = ((argnum >= 0)
1245 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s"
1246 : "type mismatch: returning a %s, but caller expects primitive %s");
1247 } else if (dst_type == T_OBJECT) {
1248 err = ((argnum >= 0)
1249 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s"
1250 : "type mismatch: returning a primitive %s, but caller expects %s");
1251 } else {
1252 err = ((argnum >= 0)
1253 ? "type mismatch: passing a %s for method argument #%d, which expects %s"
1254 : "type mismatch: returning a %s, but caller expects %s");
1255 }
1256 } else if (src_type == T_OBJECT && dst_type == T_OBJECT &&
1257 class_cast_needed(src_klass, dst_klass)) {
1258 if (!class_cast_needed(dst_klass, src_klass)) {
1259 if (raw)
1260 return NULL; // reverse cast is OK; the MH target is trusted to enforce it
1261 err = ((argnum >= 0)
1262 ? "cast required: passing a %s for method argument #%d, which expects %s"
1263 : "cast required: returning a %s, but caller expects %s");
1264 } else {
1265 err = ((argnum >= 0)
1266 ? "reference mismatch: passing a %s for method argument #%d, which expects %s"
1267 : "reference mismatch: returning a %s, but caller expects %s");
1268 }
1269 } else {
1270 // passed the obstacle course
1271 return NULL;
1272 }
1273
1274 // format, format, format
1275 const char* src_name = type2name(src_type);
1276 const char* dst_name = type2name(dst_type);
1277 if (src_type == T_OBJECT) src_name = Klass::cast(src_klass)->external_name();
1278 if (dst_type == T_OBJECT) dst_name = Klass::cast(dst_klass)->external_name();
1279 if (src_name == NULL) src_name = "unknown type";
1280 if (dst_name == NULL) dst_name = "unknown type";
1281
1282 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11);
1283 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1);
1284 if (argnum >= 0) {
1285 assert(strstr(err, "%d") != NULL, "");
1286 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name);
1287 } else {
1288 assert(strstr(err, "%d") == NULL, "");
1289 jio_snprintf(msg, msglen, err, src_name, dst_name);
1290 }
1291 return msg;
1292 }
1293
1294 // Compute the depth within the stack of the given argument, i.e.,
1295 // the combined size of arguments to the right of the given argument.
1296 // For the last argument (ptypes.length-1) this will be zero.
1297 // For the first argument (0) this will be the size of all
1298 // arguments but that one. For the special number -1, this
1299 // will be the size of all arguments, including the first.
1300 // If the argument is neither -1 nor a valid argument index,
1301 // then return a negative number. Otherwise, the result
1302 // is in the range [0..vmslots] inclusive.
1303 int MethodHandles::argument_slot(oop method_type, int arg) {
1304 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type);
1305 int argslot = 0;
1306 int len = ptypes->length();
1307 if (arg < -1 || arg >= len) return -99;
1308 for (int i = len-1; i > arg; i--) {
1309 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1310 argslot += type2size[bt];
1311 }
1312 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works");
1313 return argslot;
1314 }
1315
1316 // Given a slot number, return the argument number.
1317 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) {
1318 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type);
1319 int argslot = 0;
1320 int len = ptypes->length();
1321 for (int i = len-1; i >= 0; i--) {
1322 if (query_argslot == argslot) return i;
1323 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1324 argslot += type2size[bt];
1325 }
1326 // return pseudo-arg deepest in stack:
1327 if (query_argslot == argslot) return -1;
1328 return -99; // oob slot, or splitting a double-slot arg
1329 }
1330
1331 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m,
1332 KlassHandle receiver_limit,
1333 int decode_flags,
1334 KlassHandle receiver_klass,
1335 TRAPS) {
1336 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference");
1337 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument");
1338
1339 if (!m->is_static() &&
1340 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder())))
1341 // given type does not match class of method, or receiver is null!
1342 // caller should have checked this, but let's be extra careful...
1343 return methodHandle();
1344
1345 if (receiver_limit.not_null() &&
1346 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit())))
1347 // given type is not limited to the receiver type
1348 // note that a null receiver can match any reference value, for a static method
1349 return methodHandle();
1350
1351 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) {
1352 // pre-dispatched or static method (null receiver is OK for static)
1353 return m;
1354
1355 } else if (receiver_klass.is_null()) {
1356 // null receiver value; cannot dispatch
1357 return methodHandle();
1358
1359 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) {
1360 // perform virtual dispatch
1361 int vtable_index = m->vtable_index();
1362 guarantee(vtable_index >= 0, "valid vtable index");
1363
1364 // receiver_klass might be an arrayKlassOop but all vtables start at
1365 // the same place. The cast is to avoid virtual call and assertion.
1366 // See also LinkResolver::runtime_resolve_virtual_method.
1367 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass());
1368 DEBUG_ONLY(inst->verify_vtable_index(vtable_index));
1369 methodOop m_oop = inst->method_at_vtable(vtable_index);
1370 return methodHandle(THREAD, m_oop);
1371
1372 } else {
1373 // perform interface dispatch
1374 int itable_index = klassItable::compute_itable_index(m());
1375 guarantee(itable_index >= 0, "valid itable index");
1376 instanceKlass* inst = instanceKlass::cast(receiver_klass());
1377 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD);
1378 return methodHandle(THREAD, m_oop);
1379 }
1380 }
1381
1382 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) {
1383 // Verify type.
1384 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh()));
1385 verify_method_type(m, mtype, false, KlassHandle(), CHECK);
1386
1387 // Verify vmslots.
1388 if (java_dyn_MethodHandle::vmslots(mh()) != m->size_of_parameters()) {
1389 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH");
1390 }
1391 }
1392
1393 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) {
1394 // Check arguments.
1395 if (mh.is_null() || m.is_null() ||
1396 (!do_dispatch && m->is_abstract())) {
1397 THROW(vmSymbols::java_lang_InternalError());
1398 }
1399
1400 java_dyn_MethodHandle::init_vmslots(mh());
1401
1402 if (VerifyMethodHandles) {
1403 // The privileged code which invokes this routine should not make
1404 // a mistake about types, but it's better to verify.
1405 verify_DirectMethodHandle(mh, m, CHECK);
1406 }
1407
1408 // Finally, after safety checks are done, link to the target method.
1409 // We will follow the same path as the latter part of
1410 // InterpreterRuntime::resolve_invoke(), which first finds the method
1411 // and then decides how to populate the constant pool cache entry
1412 // that links the interpreter calls to the method. We need the same
1413 // bits, and will use the same calling sequence code.
1414
1415 int vmindex = methodOopDesc::garbage_vtable_index;
1416 oop vmtarget = NULL;
1417
1418 instanceKlass::cast(m->method_holder())->link_class(CHECK);
1419
1420 MethodHandleEntry* me = NULL;
1421 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) {
1422 // We are simulating an invokeinterface instruction.
1423 // (We might also be simulating an invokevirtual on a miranda method,
1424 // but it is safe to treat it as an invokeinterface.)
1425 assert(!m->can_be_statically_bound(), "no final methods on interfaces");
1426 vmindex = klassItable::compute_itable_index(m());
1427 assert(vmindex >= 0, "(>=0) == do_dispatch");
1428 // Set up same bits as ConstantPoolCacheEntry::set_interface_call().
1429 vmtarget = m->method_holder(); // the interface
1430 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh);
1431 } else if (!do_dispatch || m->can_be_statically_bound()) {
1432 // We are simulating an invokestatic or invokespecial instruction.
1433 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method().
1434 vmtarget = m();
1435 // this does not help dispatch, but it will make it possible to parse this MH:
1436 vmindex = methodOopDesc::nonvirtual_vtable_index;
1437 assert(vmindex < 0, "(>=0) == do_dispatch");
1438 if (!m->is_static()) {
1439 me = MethodHandles::entry(MethodHandles::_invokespecial_mh);
1440 } else {
1441 me = MethodHandles::entry(MethodHandles::_invokestatic_mh);
1442 // Part of the semantics of a static call is an initialization barrier.
1443 // For a DMH, it is done now, when the handle is created.
1444 Klass* k = Klass::cast(m->method_holder());
1445 if (k->should_be_initialized()) {
1446 k->initialize(CHECK);
1447 }
1448 }
1449 } else {
1450 // We are simulating an invokevirtual instruction.
1451 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method().
1452 // The key logic is LinkResolver::runtime_resolve_virtual_method.
1453 vmindex = m->vtable_index();
1454 vmtarget = m->method_holder();
1455 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh);
1456 }
1457
1458 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
1459
1460 sun_dyn_DirectMethodHandle::set_vmtarget(mh(), vmtarget);
1461 sun_dyn_DirectMethodHandle::set_vmindex(mh(), vmindex);
1462 DEBUG_ONLY(int flags; klassOop rlimit);
1463 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(),
1464 "properly stored for later decoding");
1465 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0));
1466 assert(!(actual_do_dispatch && !do_dispatch),
1467 "do not perform dispatch if !do_dispatch specified");
1468 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch");
1469 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack");
1470
1471 // Done!
1472 java_dyn_MethodHandle::set_vmentry(mh(), me);
1473 }
1474
1475 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh,
1476 methodHandle m,
1477 TRAPS) {
1478 // Verify type.
1479 oop receiver = sun_dyn_BoundMethodHandle::argument(mh());
1480 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh()));
1481 KlassHandle bound_recv_type;
1482 if (receiver != NULL) bound_recv_type = KlassHandle(THREAD, receiver->klass());
1483 verify_method_type(m, mtype, true, bound_recv_type, CHECK);
1484
1485 int receiver_pos = m->size_of_parameters() - 1;
1486
1487 // Verify MH.vmargslot, which should point at the bound receiver.
1488 verify_vmargslot(mh, -1, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK);
1489 //verify_vmslots(mh, CHECK);
1490
1491 // Verify vmslots.
1492 if (java_dyn_MethodHandle::vmslots(mh()) != receiver_pos) {
1493 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)");
1494 }
1495 }
1496
1497 // Initialize a BMH with a receiver bound directly to a methodOop.
1498 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh,
1499 methodHandle original_m,
1500 KlassHandle receiver_limit,
1501 int decode_flags,
1502 TRAPS) {
1503 // Check arguments.
1504 if (mh.is_null() || original_m.is_null()) {
1505 THROW(vmSymbols::java_lang_InternalError());
1506 }
1507
1508 KlassHandle receiver_klass;
1509 {
1510 oop receiver_oop = sun_dyn_BoundMethodHandle::argument(mh());
1511 if (receiver_oop != NULL)
1512 receiver_klass = KlassHandle(THREAD, receiver_oop->klass());
1513 }
1514 methodHandle m = dispatch_decoded_method(original_m,
1515 receiver_limit, decode_flags,
1516 receiver_klass,
1517 CHECK);
1518 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); }
1519 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); }
1520
1521 java_dyn_MethodHandle::init_vmslots(mh());
1522
1523 if (VerifyMethodHandles) {
1524 verify_BoundMethodHandle_with_receiver(mh, m, CHECK);
1525 }
1526
1527 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m());
1528
1529 DEBUG_ONLY(int junk; klassOop junk2);
1530 assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding");
1531 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot");
1532
1533 // Done!
1534 java_dyn_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh));
1535 }
1536
1537 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
1538 bool direct_to_method, TRAPS) {
1539 Handle ptype_handle(THREAD,
1540 java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum));
1541 KlassHandle ptype_klass;
1542 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass);
1543 int slots_pushed = type2size[ptype];
1544
1545 oop argument = sun_dyn_BoundMethodHandle::argument(mh());
1546
1547 const char* err = NULL;
1548
1549 switch (ptype) {
1550 case T_OBJECT:
1551 if (argument != NULL)
1552 // we must implicitly convert from the arg type to the outgoing ptype
1553 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum);
1554 break;
1555
1556 case T_ARRAY: case T_VOID:
1557 assert(false, "array, void do not appear here");
1558 default:
1559 if (ptype != T_INT && !is_subword_type(ptype)) {
1560 err = "unexpected parameter type";
1561 break;
1562 }
1563 // check subrange of Integer.value, if necessary
1564 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) {
1565 err = "bound integer argument must be of type java.lang.Integer";
1566 break;
1567 }
1568 if (ptype != T_INT) {
1569 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
1570 jint value = argument->int_field(value_offset);
1571 int vminfo = adapter_unbox_subword_vminfo(ptype);
1572 jint subword = truncate_subword_from_vminfo(value, vminfo);
1573 if (value != subword) {
1574 err = "bound subword value does not fit into the subword type";
1575 break;
1576 }
1577 }
1578 break;
1579 case T_FLOAT:
1580 case T_DOUBLE:
1581 case T_LONG:
1582 {
1583 // we must implicitly convert from the unboxed arg type to the outgoing ptype
1584 BasicType argbox = java_lang_boxing_object::basic_type(argument);
1585 if (argbox != ptype) {
1586 err = check_argument_type_change(T_OBJECT, (argument == NULL
1587 ? SystemDictionary::Object_klass()
1588 : argument->klass()),
1589 ptype, ptype_klass(), argnum);
1590 assert(err != NULL, "this must be an error");
1591 }
1592 break;
1593 }
1594 }
1595
1596 if (err == NULL) {
1597 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1598 if (direct_to_method) {
1599 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots");
1600 assert(slots_pushed <= MethodHandlePushLimit, "");
1601 } else {
1602 int target_pushes = decode_MethodHandle_stack_pushes(target());
1603 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct");
1604 // do not blow the stack; use a Java-based adapter if this limit is exceeded
1605 // FIXME
1606 // if (slots_pushed + target_pushes > MethodHandlePushLimit)
1607 // err = "too many bound parameters";
1608 }
1609 }
1610
1611 if (err == NULL) {
1612 // Verify the rest of the method type.
1613 err = check_method_type_insertion(java_dyn_MethodHandle::type(mh()),
1614 argnum, ptype_handle(),
1615 java_dyn_MethodHandle::type(target()));
1616 }
1617
1618 if (err != NULL) {
1619 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1620 }
1621 }
1622
1623 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
1624 // Check arguments.
1625 if (mh.is_null() || target.is_null() || !java_dyn_MethodHandle::is_instance(target())) {
1626 THROW(vmSymbols::java_lang_InternalError());
1627 }
1628
1629 java_dyn_MethodHandle::init_vmslots(mh());
1630
1631 if (VerifyMethodHandles) {
1632 int insert_after = argnum - 1;
1633 verify_vmargslot(mh, insert_after, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK);
1634 verify_vmslots(mh, CHECK);
1635 }
1636
1637 // Get bound type and required slots.
1638 oop ptype_oop = java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum);
1639 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop);
1640 int slots_pushed = type2size[ptype];
1641
1642 // If (a) the target is a direct non-dispatched method handle,
1643 // or (b) the target is a dispatched direct method handle and we
1644 // are binding the receiver, cut out the middle-man.
1645 // Do this by decoding the DMH and using its methodOop directly as vmtarget.
1646 bool direct_to_method = false;
1647 if (OptimizeMethodHandles &&
1648 target->klass() == SystemDictionary::DirectMethodHandle_klass() &&
1649 (argnum == 0 || sun_dyn_DirectMethodHandle::vmindex(target()) < 0)) {
1650 int decode_flags = 0; klassOop receiver_limit_oop = NULL;
1651 methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags));
1652 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); }
1653 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg.
1654 assert(sun_dyn_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig");
1655 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) {
1656 KlassHandle receiver_limit(THREAD, receiver_limit_oop);
1657 init_BoundMethodHandle_with_receiver(mh, m,
1658 receiver_limit, decode_flags,
1659 CHECK);
1660 return;
1661 }
1662
1663 // Even if it is not a bound receiver, we still might be able
1664 // to bind another argument and still invoke the methodOop directly.
1665 if (!(decode_flags & _dmf_does_dispatch)) {
1666 direct_to_method = true;
1667 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m());
1668 }
1669 }
1670 if (!direct_to_method)
1671 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), target());
1672
1673 if (VerifyMethodHandles) {
1674 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK);
1675 }
1676
1677 // Next question: Is this a ref, int, or long bound value?
1678 MethodHandleEntry* me = NULL;
1679 if (ptype == T_OBJECT) {
1680 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh);
1681 else me = MethodHandles::entry(_bound_ref_mh);
1682 } else if (slots_pushed == 2) {
1683 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh);
1684 else me = MethodHandles::entry(_bound_long_mh);
1685 } else if (slots_pushed == 1) {
1686 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh);
1687 else me = MethodHandles::entry(_bound_int_mh);
1688 } else {
1689 assert(false, "");
1690 }
1691
1692 // Done!
1693 java_dyn_MethodHandle::set_vmentry(mh(), me);
1694 }
1695
1696 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) {
1697 char msg[200];
1698 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err);
1699 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg);
1700 }
1701
1702 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) {
1703 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh());
1704 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh());
1705
1706 verify_vmargslot(mh, argnum, argslot, CHECK);
1707 verify_vmslots(mh, CHECK);
1708
1709 jint conv_op = adapter_conversion_op(conversion);
1710 if (!conv_op_valid(conv_op)) {
1711 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD);
1712 return;
1713 }
1714 EntryKind ek = adapter_entry_kind(conv_op);
1715
1716 int stack_move = adapter_conversion_stack_move(conversion);
1717 BasicType src = adapter_conversion_src_type(conversion);
1718 BasicType dest = adapter_conversion_dest_type(conversion);
1719 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
1720
1721 Handle argument(THREAD, sun_dyn_AdapterMethodHandle::argument(mh()));
1722 Handle target(THREAD, sun_dyn_AdapterMethodHandle::vmtarget(mh()));
1723 Handle src_mtype(THREAD, java_dyn_MethodHandle::type(mh()));
1724 Handle dst_mtype(THREAD, java_dyn_MethodHandle::type(target()));
1725
1726 const char* err = NULL;
1727
1728 if (err == NULL) {
1729 // Check that the correct argument is supplied, but only if it is required.
1730 switch (ek) {
1731 case _adapter_check_cast: // target type of cast
1732 case _adapter_ref_to_prim: // wrapper type from which to unbox
1733 case _adapter_prim_to_ref: // wrapper type to box into
1734 case _adapter_collect_args: // array type to collect into
1735 case _adapter_spread_args: // array type to spread from
1736 if (!java_lang_Class::is_instance(argument())
1737 || java_lang_Class::is_primitive(argument()))
1738 { err = "adapter requires argument of type java.lang.Class"; break; }
1739 if (ek == _adapter_collect_args ||
1740 ek == _adapter_spread_args) {
1741 // Make sure it is a suitable collection type. (Array, for now.)
1742 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument()));
1743 if (!ak->oop_is_objArray()) {
1744 { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; }
1745 }
1746 }
1747 break;
1748 case _adapter_flyby:
1749 case _adapter_ricochet:
1750 if (!java_dyn_MethodHandle::is_instance(argument()))
1751 { err = "MethodHandle adapter argument required"; break; }
1752 break;
1753 default:
1754 if (argument.not_null())
1755 { err = "adapter has spurious argument"; break; }
1756 break;
1757 }
1758 }
1759
1760 if (err == NULL) {
1761 // Check that the src/dest types are supplied if needed.
1762 switch (ek) {
1763 case _adapter_check_cast:
1764 if (src != T_OBJECT || dest != T_OBJECT) {
1765 err = "adapter requires object src/dest conversion subfields";
1766 }
1767 break;
1768 case _adapter_prim_to_prim:
1769 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) {
1770 err = "adapter requires primitive src/dest conversion subfields"; break;
1771 }
1772 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) ||
1773 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) {
1774 err = "adapter cannot convert beween floating and fixed-point"; break;
1775 }
1776 break;
1777 case _adapter_ref_to_prim:
1778 if (src != T_OBJECT || !is_java_primitive(dest)
1779 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) {
1780 err = "adapter requires primitive dest conversion subfield"; break;
1781 }
1782 break;
1783 case _adapter_prim_to_ref:
1784 if (!is_java_primitive(src) || dest != T_OBJECT
1785 || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) {
1786 err = "adapter requires primitive src conversion subfield"; break;
1787 }
1788 break;
1789 case _adapter_swap_args:
1790 case _adapter_rot_args:
1791 {
1792 if (!src || src != dest) {
1793 err = "adapter requires src/dest conversion subfields for swap"; break;
1794 }
1795 int swap_size = type2size[src];
1796 oop src_mtype = sun_dyn_AdapterMethodHandle::type(mh());
1797 oop dest_mtype = sun_dyn_AdapterMethodHandle::type(target());
1798 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(target());
1799 int src_slot = argslot;
1800 int dest_slot = vminfo;
1801 bool rotate_up = (src_slot > dest_slot); // upward rotation
1802 int src_arg = argnum;
1803 int dest_arg = argument_slot_to_argnum(dest_mtype, dest_slot);
1804 verify_vmargslot(mh, dest_arg, dest_slot, CHECK);
1805 if (!(dest_slot >= src_slot + swap_size) &&
1806 !(src_slot >= dest_slot + swap_size)) {
1807 err = "source, destination slots must be distinct";
1808 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) {
1809 err = "source of swap must be deeper in stack";
1810 } else if (ek == _adapter_swap_args) {
1811 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, dest_arg),
1812 java_dyn_MethodType::ptype(dest_mtype, src_arg),
1813 dest_arg);
1814 } else if (ek == _adapter_rot_args) {
1815 if (rotate_up) {
1816 assert((src_slot > dest_slot) && (src_arg < dest_arg), "");
1817 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot]
1818 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1]
1819 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) {
1820 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i),
1821 java_dyn_MethodType::ptype(dest_mtype, i-1),
1822 i);
1823 }
1824 } else { // rotate down
1825 assert((src_slot < dest_slot) && (src_arg > dest_arg), "");
1826 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss]
1827 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg]
1828 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) {
1829 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i),
1830 java_dyn_MethodType::ptype(dest_mtype, i+1),
1831 i);
1832 }
1833 }
1834 }
1835 if (err == NULL)
1836 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, src_arg),
1837 java_dyn_MethodType::ptype(dest_mtype, dest_arg),
1838 src_arg);
1839 }
1840 break;
1841 case _adapter_collect_args:
1842 case _adapter_spread_args:
1843 {
1844 BasicType coll_type = (ek == _adapter_collect_args) ? dest : src;
1845 BasicType elem_type = (ek == _adapter_collect_args) ? src : dest;
1846 if (coll_type != T_OBJECT || elem_type != T_OBJECT) {
1847 err = "adapter requires src/dest subfields"; break;
1848 // later:
1849 // - consider making coll be a primitive array
1850 // - consider making coll be a heterogeneous collection
1851 }
1852 }
1853 break;
1854 default:
1855 if (src != 0 || dest != 0) {
1856 err = "adapter has spurious src/dest conversion subfields"; break;
1857 }
1858 break;
1859 }
1860 }
1861
1862 if (err == NULL) {
1863 // Check the stack_move subfield.
1864 // It must always report the net change in stack size, positive or negative.
1865 int slots_pushed = stack_move / stack_move_unit();
1866 switch (ek) {
1867 case _adapter_prim_to_prim:
1868 case _adapter_ref_to_prim:
1869 case _adapter_prim_to_ref:
1870 if (slots_pushed != type2size[dest] - type2size[src]) {
1871 err = "wrong stack motion for primitive conversion";
1872 }
1873 break;
1874 case _adapter_dup_args:
1875 if (slots_pushed <= 0) {
1876 err = "adapter requires conversion subfield slots_pushed > 0";
1877 }
1878 break;
1879 case _adapter_drop_args:
1880 if (slots_pushed >= 0) {
1881 err = "adapter requires conversion subfield slots_pushed < 0";
1882 }
1883 break;
1884 case _adapter_collect_args:
1885 if (slots_pushed > 1) {
1886 err = "adapter requires conversion subfield slots_pushed <= 1";
1887 }
1888 break;
1889 case _adapter_spread_args:
1890 if (slots_pushed < -1) {
1891 err = "adapter requires conversion subfield slots_pushed >= -1";
1892 }
1893 break;
1894 default:
1895 if (stack_move != 0) {
1896 err = "adapter has spurious stack_move conversion subfield";
1897 }
1898 break;
1899 }
1900 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) {
1901 err = "stack_move conversion subfield must be multiple of stack_move_unit";
1902 }
1903 }
1904
1905 if (err == NULL) {
1906 // Make sure this adapter does not push too deeply.
1907 int slots_pushed = stack_move / stack_move_unit();
1908 int this_vmslots = java_dyn_MethodHandle::vmslots(mh());
1909 int target_vmslots = java_dyn_MethodHandle::vmslots(target());
1910 if (slots_pushed != (target_vmslots - this_vmslots)) {
1911 err = "stack_move inconsistent with previous and current MethodType vmslots";
1912 } else if (slots_pushed > 0) {
1913 // verify stack_move against MethodHandlePushLimit
1914 int target_pushes = decode_MethodHandle_stack_pushes(target());
1915 // do not blow the stack; use a Java-based adapter if this limit is exceeded
1916 if (slots_pushed + target_pushes > MethodHandlePushLimit) {
1917 err = "adapter pushes too many parameters";
1918 }
1919 }
1920
1921 // While we're at it, check that the stack motion decoder works:
1922 DEBUG_ONLY(int target_pushes = decode_MethodHandle_stack_pushes(target()));
1923 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1924 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct");
1925 }
1926
1927 if (err == NULL && vminfo != 0) {
1928 switch (ek) {
1929 case _adapter_swap_args:
1930 case _adapter_rot_args:
1931 break; // OK
1932 default:
1933 err = "vminfo subfield is reserved to the JVM";
1934 }
1935 }
1936
1937 // Do additional ad hoc checks.
1938 if (err == NULL) {
1939 switch (ek) {
1940 case _adapter_retype_only:
1941 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false);
1942 break;
1943
1944 case _adapter_retype_raw:
1945 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true);
1946 break;
1947
1948 case _adapter_check_cast:
1949 {
1950 // The actual value being checked must be a reference:
1951 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype(), argnum),
1952 object_java_mirror(), argnum);
1953 if (err != NULL) break;
1954
1955 // The output of the cast must fit with the destination argument:
1956 Handle cast_class = argument;
1957 err = check_method_type_conversion(src_mtype(),
1958 argnum, cast_class(),
1959 dst_mtype());
1960 }
1961 break;
1962
1963 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles
1964 }
1965 }
1966
1967 if (err != NULL) {
1968 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
1969 return;
1970 }
1971
1972 }
1973
1974 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
1975 oop argument = sun_dyn_AdapterMethodHandle::argument(mh());
1976 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh());
1977 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh());
1978 jint conv_op = adapter_conversion_op(conversion);
1979
1980 // adjust the adapter code to the internal EntryKind enumeration:
1981 EntryKind ek_orig = adapter_entry_kind(conv_op);
1982 EntryKind ek_opt = ek_orig; // may be optimized
1983
1984 // Finalize the vmtarget field (Java initialized it to null).
1985 if (!java_dyn_MethodHandle::is_instance(target())) {
1986 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD);
1987 return;
1988 }
1989 sun_dyn_AdapterMethodHandle::set_vmtarget(mh(), target());
1990
1991 if (VerifyMethodHandles) {
1992 verify_AdapterMethodHandle(mh, argnum, CHECK);
1993 }
1994
1995 int stack_move = adapter_conversion_stack_move(conversion);
1996 BasicType src = adapter_conversion_src_type(conversion);
1997 BasicType dest = adapter_conversion_dest_type(conversion);
1998 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
1999
2000 const char* err = NULL;
2001
2002 // Now it's time to finish the case analysis and pick a MethodHandleEntry.
2003 switch (ek_orig) {
2004 case _adapter_retype_only:
2005 case _adapter_retype_raw:
2006 case _adapter_check_cast:
2007 case _adapter_dup_args:
2008 case _adapter_drop_args:
2009 // these work fine via general case code
2010 break;
2011
2012 case _adapter_prim_to_prim:
2013 {
2014 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}.
2015 // And, the {float,double} -> {int,long} cases must be handled by Java.
2016 switch (type2size[src] *4+ type2size[dest]) {
2017 case 1 *4+ 1:
2018 assert(src == T_INT || is_subword_type(src), "source is not float");
2019 // Subword-related cases are int -> {boolean,byte,char,short}.
2020 ek_opt = _adapter_opt_i2i;
2021 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2022 break;
2023 case 2 *4+ 1:
2024 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) {
2025 ek_opt = _adapter_opt_l2i;
2026 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2027 } else if (src == T_DOUBLE && dest == T_FLOAT) {
2028 ek_opt = _adapter_opt_d2f;
2029 } else {
2030 assert(false, "");
2031 }
2032 break;
2033 case 1 *4+ 2:
2034 if (src == T_INT && dest == T_LONG) {
2035 ek_opt = _adapter_opt_i2l;
2036 } else if (src == T_FLOAT && dest == T_DOUBLE) {
2037 ek_opt = _adapter_opt_f2d;
2038 } else {
2039 assert(false, "");
2040 }
2041 break;
2042 default:
2043 assert(false, "");
2044 break;
2045 }
2046 }
2047 break;
2048
2049 case _adapter_ref_to_prim:
2050 {
2051 switch (type2size[dest]) {
2052 case 1:
2053 ek_opt = _adapter_opt_unboxi;
2054 vminfo = adapter_unbox_subword_vminfo(dest);
2055 break;
2056 case 2:
2057 ek_opt = _adapter_opt_unboxl;
2058 break;
2059 default:
2060 assert(false, "");
2061 break;
2062 }
2063 }
2064 break;
2065
2066 case _adapter_prim_to_ref:
2067 goto throw_not_impl; // allocates, hence could block
2068
2069 case _adapter_swap_args:
2070 case _adapter_rot_args:
2071 {
2072 int swap_slots = type2size[src];
2073 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(mh());
2074 int src_slot = argslot;
2075 int dest_slot = vminfo;
2076 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1;
2077 switch (swap_slots) {
2078 case 1:
2079 ek_opt = (!rotate ? _adapter_opt_swap_1 :
2080 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down);
2081 break;
2082 case 2:
2083 ek_opt = (!rotate ? _adapter_opt_swap_2 :
2084 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down);
2085 break;
2086 default:
2087 assert(false, "");
2088 break;
2089 }
2090 }
2091 break;
2092
2093 case _adapter_collect_args:
2094 goto throw_not_impl; // allocates, hence could block
2095
2096 case _adapter_spread_args:
2097 {
2098 // vminfo will be the required length of the array
2099 int slots_pushed = stack_move / stack_move_unit();
2100 int array_size = slots_pushed + 1;
2101 assert(array_size >= 0, "");
2102 vminfo = array_size;
2103 switch (array_size) {
2104 case 0: ek_opt = _adapter_opt_spread_0; break;
2105 case 1: ek_opt = _adapter_opt_spread_1; break;
2106 default: ek_opt = _adapter_opt_spread_more; break;
2107 }
2108 if ((vminfo & CONV_VMINFO_MASK) != vminfo)
2109 goto throw_not_impl; // overflow
2110 }
2111 break;
2112
2113 case _adapter_flyby:
2114 case _adapter_ricochet:
2115 goto throw_not_impl; // runs Java code, hence could block
2116
2117 default:
2118 // should have failed much earlier; must be a missing case here
2119 assert(false, "incomplete switch");
2120 // and fall through:
2121
2122 throw_not_impl:
2123 // FIXME: these adapters are NYI
2124 err = "adapter not yet implemented in the JVM";
2125 break;
2126 }
2127
2128 if (err != NULL) {
2129 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
2130 return;
2131 }
2132
2133 // Rebuild the conversion value; maybe parts of it were changed.
2134 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo);
2135
2136 // Finalize the conversion field. (Note that it is final to Java code.)
2137 sun_dyn_AdapterMethodHandle::set_conversion(mh(), new_conversion);
2138
2139 // Done!
2140 java_dyn_MethodHandle::set_vmentry(mh(), entry(ek_opt));
2141
2142 // There should be enough memory barriers on exit from native methods
2143 // to ensure that the MH is fully initialized to all threads before
2144 // Java code can publish it in global data structures.
2145 }
2146
2147 //
2148 // Here are the native methods on sun.dyn.MethodHandleImpl.
2149 // They are the private interface between this JVM and the HotSpot-specific
2150 // Java code that implements JSR 292 method handles.
2151 //
2152 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
2153 // that intrinsic (non-JNI) native methods are defined in HotSpot.
2154 //
2155
2156 // direct method handles for invokestatic or invokespecial
2157 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller);
2158 JVM_ENTRY(void, MHI_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2159 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) {
2160 ResourceMark rm; // for error messages
2161
2162 // This is the guy we are initializing:
2163 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2164 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2165
2166 // Early returns out of this method leave the DMH in an unfinished state.
2167 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2168
2169 // which method are we really talking about?
2170 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2171 oop target_oop = JNIHandles::resolve_non_null(target_jh);
2172 if (sun_dyn_MemberName::is_instance(target_oop) &&
2173 sun_dyn_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) {
2174 Handle mname(THREAD, target_oop);
2175 MethodHandles::resolve_MemberName(mname, CHECK);
2176 target_oop = mname(); // in case of GC
2177 }
2178
2179 int decode_flags = 0; klassOop receiver_limit = NULL;
2180 methodHandle m(THREAD,
2181 MethodHandles::decode_method(target_oop,
2182 receiver_limit, decode_flags));
2183 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); }
2184
2185 // The trusted Java code that calls this method should already have performed
2186 // access checks on behalf of the given caller. But, we can verify this.
2187 if (VerifyMethodHandles && caller_jh != NULL) {
2188 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)));
2189 // If this were a bytecode, the first access check would be against
2190 // the "reference class" mentioned in the CONSTANT_Methodref.
2191 // We don't know at this point which class that was, and if we
2192 // check against m.method_holder we might get the wrong answer.
2193 // So we just make sure to handle this check when the resolution
2194 // happens, when we call resolve_MemberName.
2195 //
2196 // (A public class can inherit public members from private supers,
2197 // and it would be wrong to check access against the private super
2198 // if the original symbolic reference was against the public class.)
2199 //
2200 // If there were a bytecode, the next step would be to lookup the method
2201 // in the reference class, then then check the method's access bits.
2202 // Emulate LinkResolver::check_method_accessability.
2203 klassOop resolved_klass = m->method_holder();
2204 if (!Reflection::verify_field_access(caller->as_klassOop(),
2205 resolved_klass, resolved_klass,
2206 m->access_flags(),
2207 true)) {
2208 // %%% following cutout belongs in Reflection::verify_field_access?
2209 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(),
2210 resolved_klass, THREAD);
2211 if (!same_pm) {
2212 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string());
2213 }
2214 }
2215 }
2216
2217 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK);
2218 }
2219 JVM_END
2220
2221 // bound method handles
2222 JVM_ENTRY(void, MHI_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2223 jobject target_jh, int argnum)) {
2224 ResourceMark rm; // for error messages
2225
2226 // This is the guy we are initializing:
2227 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2228 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2229
2230 // Early returns out of this method leave the BMH in an unfinished state.
2231 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2232
2233 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2234 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2235
2236 if (!java_dyn_MethodHandle::is_instance(target())) {
2237 // Target object is a reflective method. (%%% Do we need this alternate path?)
2238 Untested("init_BMH of non-MH");
2239 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); }
2240 int decode_flags = 0; klassOop receiver_limit_oop = NULL;
2241 methodHandle m(THREAD,
2242 MethodHandles::decode_method(target(),
2243 receiver_limit_oop,
2244 decode_flags));
2245 KlassHandle receiver_limit(THREAD, receiver_limit_oop);
2246 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m,
2247 receiver_limit,
2248 decode_flags,
2249 CHECK);
2250 return;
2251 }
2252
2253 // Build a BMH on top of a DMH or another BMH:
2254 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK);
2255 }
2256 JVM_END
2257
2258 // adapter method handles
2259 JVM_ENTRY(void, MHI_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2260 jobject target_jh, int argnum)) {
2261 // This is the guy we are initializing:
2262 if (mh_jh == NULL || target_jh == NULL) {
2263 THROW(vmSymbols::java_lang_InternalError());
2264 }
2265 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2266 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2267
2268 // Early returns out of this method leave the AMH in an unfinished state.
2269 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2270
2271 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK);
2272 }
2273 JVM_END
2274
2275 // method type forms
2276 JVM_ENTRY(void, MHI_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) {
2277 if (erased_jh == NULL) return;
2278 if (TraceMethodHandles) {
2279 tty->print("creating MethodType form ");
2280 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH!
2281 // call Object.toString()
2282 symbolOop name = vmSymbols::toString_name(), sig = vmSymbols::void_string_signature();
2283 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh)));
2284 JavaValue result(T_OBJECT);
2285 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig,
2286 &args, CHECK);
2287 Handle str(THREAD, (oop)result.get_jobject());
2288 java_lang_String::print(str, tty);
2289 }
2290 tty->cr();
2291 }
2292 }
2293 JVM_END
2294
2295 // debugging and reflection
2296 JVM_ENTRY(jobject, MHI_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) {
2297 Handle mh(THREAD, JNIHandles::resolve(mh_jh));
2298 if (!java_dyn_MethodHandle::is_instance(mh())) {
2299 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
2300 }
2301 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL);
2302 return JNIHandles::make_local(THREAD, target);
2303 }
2304 JVM_END
2305
2306 JVM_ENTRY(jint, MHI_getConstant(JNIEnv *env, jobject igcls, jint which)) {
2307 switch (which) {
2308 case MethodHandles::GC_JVM_PUSH_LIMIT:
2309 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF,
2310 "MethodHandlePushLimit parameter must be in valid range");
2311 return MethodHandlePushLimit;
2312 case MethodHandles::GC_JVM_STACK_MOVE_UNIT:
2313 // return number of words per slot, signed according to stack direction
2314 return MethodHandles::stack_move_unit();
2315 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK:
2316 return MethodHandles::adapter_conversion_ops_supported_mask();
2317 }
2318 return 0;
2319 }
2320 JVM_END
2321
2322 #ifndef PRODUCT
2323 #define EACH_NAMED_CON(template) \
2324 template(MethodHandles,GC_JVM_PUSH_LIMIT) \
2325 template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) \
2326 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \
2327 template(MethodHandles,ETF_DIRECT_HANDLE) \
2328 template(MethodHandles,ETF_METHOD_NAME) \
2329 template(MethodHandles,ETF_REFLECT_METHOD) \
2330 template(sun_dyn_MemberName,MN_IS_METHOD) \
2331 template(sun_dyn_MemberName,MN_IS_CONSTRUCTOR) \
2332 template(sun_dyn_MemberName,MN_IS_FIELD) \
2333 template(sun_dyn_MemberName,MN_IS_TYPE) \
2334 template(sun_dyn_MemberName,MN_SEARCH_SUPERCLASSES) \
2335 template(sun_dyn_MemberName,MN_SEARCH_INTERFACES) \
2336 template(sun_dyn_MemberName,VM_INDEX_UNINITIALIZED) \
2337 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_ONLY) \
2338 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_RAW) \
2339 template(sun_dyn_AdapterMethodHandle,OP_CHECK_CAST) \
2340 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_PRIM) \
2341 template(sun_dyn_AdapterMethodHandle,OP_REF_TO_PRIM) \
2342 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_REF) \
2343 template(sun_dyn_AdapterMethodHandle,OP_SWAP_ARGS) \
2344 template(sun_dyn_AdapterMethodHandle,OP_ROT_ARGS) \
2345 template(sun_dyn_AdapterMethodHandle,OP_DUP_ARGS) \
2346 template(sun_dyn_AdapterMethodHandle,OP_DROP_ARGS) \
2347 template(sun_dyn_AdapterMethodHandle,OP_COLLECT_ARGS) \
2348 template(sun_dyn_AdapterMethodHandle,OP_SPREAD_ARGS) \
2349 template(sun_dyn_AdapterMethodHandle,OP_FLYBY) \
2350 template(sun_dyn_AdapterMethodHandle,OP_RICOCHET) \
2351 template(sun_dyn_AdapterMethodHandle,CONV_OP_LIMIT) \
2352 template(sun_dyn_AdapterMethodHandle,CONV_OP_MASK) \
2353 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_MASK) \
2354 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_SHIFT) \
2355 template(sun_dyn_AdapterMethodHandle,CONV_OP_SHIFT) \
2356 template(sun_dyn_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \
2357 template(sun_dyn_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \
2358 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \
2359 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \
2360 /*end*/
2361
2362 #define ONE_PLUS(scope,value) 1+
2363 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0;
2364 #define VALUE_COMMA(scope,value) scope::value,
2365 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 };
2366 #define STRING_NULL(scope,value) #value "\0"
2367 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) };
2368
2369 #undef ONE_PLUS
2370 #undef VALUE_COMMA
2371 #undef STRING_NULL
2372 #undef EACH_NAMED_CON
2373 #endif
2374
2375 JVM_ENTRY(jint, MHI_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
2376 #ifndef PRODUCT
2377 if (which >= 0 && which < con_value_count) {
2378 int con = con_values[which];
2379 objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh);
2380 if (box != NULL && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
2381 const char* str = &con_names[0];
2382 for (int i = 0; i < which; i++)
2383 str += strlen(str) + 1; // skip name and null
2384 oop name = java_lang_String::create_oop_from_str(str, CHECK_0);
2385 box->obj_at_put(0, name);
2386 }
2387 return con;
2388 }
2389 #endif
2390 return 0;
2391 }
2392 JVM_END
2393
2394 // void init(MemberName self, AccessibleObject ref)
2395 JVM_ENTRY(void, MHI_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
2396 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2397 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2398 oop target_oop = JNIHandles::resolve_non_null(target_jh);
2399 MethodHandles::init_MemberName(mname(), target_oop);
2400 }
2401 JVM_END
2402
2403 // void expand(MemberName self)
2404 JVM_ENTRY(void, MHI_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
2405 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2406 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2407 MethodHandles::expand_MemberName(mname, 0, CHECK);
2408 }
2409 JVM_END
2410
2411 // void resolve(MemberName self, Class<?> caller)
2412 JVM_ENTRY(void, MHI_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
2413 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2414 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2415
2416 // The trusted Java code that calls this method should already have performed
2417 // access checks on behalf of the given caller. But, we can verify this.
2418 if (VerifyMethodHandles && caller_jh != NULL) {
2419 klassOop reference_klass = java_lang_Class::as_klassOop(sun_dyn_MemberName::clazz(mname()));
2420 if (reference_klass != NULL) {
2421 // Emulate LinkResolver::check_klass_accessability.
2422 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh));
2423 if (!Reflection::verify_class_access(caller,
2424 reference_klass,
2425 true)) {
2426 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name());
2427 }
2428 }
2429 }
2430
2431 MethodHandles::resolve_MemberName(mname, CHECK);
2432 }
2433 JVM_END
2434
2435 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
2436 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
2437 JVM_ENTRY(jint, MHI_getMembers(JNIEnv *env, jobject igcls,
2438 jclass clazz_jh, jstring name_jh, jstring sig_jh,
2439 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
2440 if (clazz_jh == NULL || results_jh == NULL) return -1;
2441 klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh));
2442
2443 objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh);
2444 if (results == NULL || !results->is_objArray()) return -1;
2445
2446 symbolOop name = NULL, sig = NULL;
2447 if (name_jh != NULL) {
2448 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
2449 if (name == NULL) return 0; // a match is not possible
2450 }
2451 if (sig_jh != NULL) {
2452 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
2453 if (sig == NULL) return 0; // a match is not possible
2454 }
2455
2456 klassOop caller = NULL;
2457 if (caller_jh != NULL) {
2458 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
2459 if (!java_lang_Class::is_instance(caller_oop)) return -1;
2460 caller = java_lang_Class::as_klassOop(caller_oop);
2461 }
2462
2463 if (name != NULL && sig != NULL && results != NULL) {
2464 // try a direct resolve
2465 // %%% TO DO
2466 }
2467
2468 int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags,
2469 caller, skip, results);
2470 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
2471 return res;
2472 }
2473 JVM_END
2474
2475 JVM_ENTRY(void, MHI_registerBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh, jobject bsm_jh)) {
2476 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD);
2477 if (!AllowTransitionalJSR292) {
2478 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2479 "registerBootstrapMethod is only supported in JSR 292 EDR");
2480 }
2481 ik->link_class(CHECK);
2482 if (!java_dyn_MethodHandle::is_instance(JNIHandles::resolve(bsm_jh))) {
2483 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "method handle");
2484 }
2485 const char* err = NULL;
2486 if (ik->is_initialized() || ik->is_in_error_state()) {
2487 err = "too late: class is already initialized";
2488 } else {
2489 ObjectLocker ol(ik, THREAD); // note: this should be a recursive lock
2490 if (ik->is_not_initialized() ||
2491 (ik->is_being_initialized() && ik->is_reentrant_initialization(THREAD))) {
2492 if (ik->bootstrap_method() != NULL) {
2493 err = "class is already equipped with a bootstrap method";
2494 } else {
2495 ik->set_bootstrap_method(JNIHandles::resolve_non_null(bsm_jh));
2496 err = NULL;
2497 }
2498 } else {
2499 err = "class is already initialized";
2500 if (ik->is_being_initialized())
2501 err = "class is already being initialized in a different thread";
2502 }
2503 }
2504 if (err != NULL) {
2505 THROW_MSG(vmSymbols::java_lang_IllegalStateException(), err);
2506 }
2507 }
2508 JVM_END
2509
2510 JVM_ENTRY(jobject, MHI_getBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh)) {
2511 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD);
2512 return JNIHandles::make_local(THREAD, ik->bootstrap_method());
2513 }
2514 JVM_END
2515
2516 JVM_ENTRY(void, MHI_setCallSiteTarget(JNIEnv *env, jobject igcls, jobject site_jh, jobject target_jh)) {
2517 // No special action required, yet.
2518 oop site_oop = JNIHandles::resolve(site_jh);
2519 if (!java_dyn_CallSite::is_instance(site_oop))
2520 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "not a CallSite");
2521 java_dyn_CallSite::set_target(site_oop, JNIHandles::resolve(target_jh));
2522 }
2523 JVM_END
2524
2525
2526 /// JVM_RegisterMethodHandleMethods
2527
2528 #define ADR "J"
2529
2530 #define LANG "Ljava/lang/"
2531 #define JDYN "Ljava/dyn/"
2532 #define IDYN "Lsun/dyn/"
2533
2534 #define OBJ LANG"Object;"
2535 #define CLS LANG"Class;"
2536 #define STRG LANG"String;"
2537 #define CST JDYN"CallSite;"
2538 #define MT JDYN"MethodType;"
2539 #define MH JDYN"MethodHandle;"
2540 #define MHI IDYN"MethodHandleImpl;"
2541 #define MEM IDYN"MemberName;"
2542 #define AMH IDYN"AdapterMethodHandle;"
2543 #define BMH IDYN"BoundMethodHandle;"
2544 #define DMH IDYN"DirectMethodHandle;"
2545
2546 #define CC (char*) /*cast a literal from (const char*)*/
2547 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
2548
2549 // These are the native methods on sun.dyn.MethodHandleNatives.
2550 static JNINativeMethod methods[] = {
2551 // void init(MemberName self, AccessibleObject ref)
2552 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHI_init_AMH)},
2553 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHI_init_BMH)},
2554 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHI_init_DMH)},
2555 {CC"init", CC"("MT")V", FN_PTR(MHI_init_MT)},
2556 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHI_init_Mem)},
2557 {CC"expand", CC"("MEM")V", FN_PTR(MHI_expand_Mem)},
2558 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHI_resolve_Mem)},
2559 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHI_getTarget)},
2560 {CC"getConstant", CC"(I)I", FN_PTR(MHI_getConstant)},
2561 // static native int getNamedCon(int which, Object[] name)
2562 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHI_getNamedCon)},
2563 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
2564 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
2565 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHI_getMembers)}
2566 };
2567
2568 // More entry points specifically for EnableInvokeDynamic.
2569 static JNINativeMethod methods2[] = {
2570 {CC"registerBootstrap", CC"("CLS MH")V", FN_PTR(MHI_registerBootstrap)},
2571 {CC"getBootstrap", CC"("CLS")"MH, FN_PTR(MHI_getBootstrap)},
2572 {CC"setCallSiteTarget", CC"("CST MH")V", FN_PTR(MHI_setCallSiteTarget)}
2573 };
2574
2575
2576 // This one function is exported, used by NativeLookup.
2577
2578 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
2579 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK");
2580
2581 // note: this explicit warning-producing stuff will be replaced by auto-detection of the JSR 292 classes
2582
2583 if (!EnableMethodHandles) {
2584 warning("JSR 292 method handles are disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableMethodHandles to enable.");
2585 return; // bind nothing
2586 }
2587
2588 bool enable_MH = true;
2589
2590 {
2591 ThreadToNativeFromVM ttnfv(thread);
2592
2593 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod));
2594 if (env->ExceptionOccurred()) {
2595 MethodHandles::set_enabled(false);
2596 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
2597 enable_MH = false;
2598 env->ExceptionClear();
2599 }
2600 }
2601
2602 if (enable_MH) {
2603 KlassHandle MHI_klass = SystemDictionaryHandles::MethodHandleImpl_klass();
2604 if (MHI_klass.not_null()) {
2605 symbolHandle raiseException_name = oopFactory::new_symbol_handle("raiseException", CHECK);
2606 symbolHandle raiseException_sig = oopFactory::new_symbol_handle("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK);
2607 methodOop raiseException_method = instanceKlass::cast(MHI_klass->as_klassOop())
2608 ->find_method(raiseException_name(), raiseException_sig());
2609 if (raiseException_method != NULL && raiseException_method->is_static()) {
2610 MethodHandles::set_raise_exception_method(raiseException_method);
2611 } else {
2612 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
2613 enable_MH = false;
2614 }
2615 }
2616 }
2617
2618 if (enable_MH) {
2619 MethodHandles::set_enabled(true);
2620 }
2621
2622 if (!EnableInvokeDynamic) {
2623 warning("JSR 292 invokedynamic is disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableInvokeDynamic to enable.");
2624 return; // bind nothing
2625 }
2626
2627 {
2628 ThreadToNativeFromVM ttnfv(thread);
2629
2630 int status = env->RegisterNatives(MHN_class, methods2, sizeof(methods2)/sizeof(JNINativeMethod));
2631 if (env->ExceptionOccurred()) {
2632 MethodHandles::set_enabled(false);
2633 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
2634 env->ExceptionClear();
2635 } else {
2636 MethodHandles::set_enabled(true);
2637 }
2638 }
2639 }
2640 JVM_END