1 /*
2 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "interpreter/interpreter.hpp"
28 #include "interpreter/oopMapCache.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/oopFactory.hpp"
31 #include "prims/methodHandles.hpp"
32 #include "prims/methodHandleWalk.hpp"
33 #include "runtime/javaCalls.hpp"
34 #include "runtime/reflection.hpp"
35 #include "runtime/signature.hpp"
36 #include "runtime/stubRoutines.hpp"
37
38 /*
39 * JSR 292 reference implementation: method handles
40 */
41
42 bool MethodHandles::_enabled = false; // set true after successful native linkage
43
44 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL};
45 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = {
46 "raise_exception",
47 "invokestatic", // how a MH emulates invokestatic
48 "invokespecial", // ditto for the other invokes...
49 "invokevirtual",
50 "invokeinterface",
51 "bound_ref", // these are for BMH...
52 "bound_int",
53 "bound_long",
54 "bound_ref_direct", // (direct versions have a direct methodOop)
55 "bound_int_direct",
56 "bound_long_direct",
57
58 // starting at _adapter_mh_first:
59 "adapter_retype_only", // these are for AMH...
60 "adapter_retype_raw",
61 "adapter_check_cast",
62 "adapter_prim_to_prim",
63 "adapter_ref_to_prim",
64 "adapter_prim_to_ref",
65 "adapter_swap_args",
66 "adapter_rot_args",
67 "adapter_dup_args",
68 "adapter_drop_args",
69 "adapter_collect_args",
70 "adapter_spread_args",
71 "adapter_fold_args",
72 "adapter_unused_13",
73
74 // optimized adapter types:
75 "adapter_swap_args/1",
76 "adapter_swap_args/2",
77 "adapter_rot_args/1,up",
78 "adapter_rot_args/1,down",
79 "adapter_rot_args/2,up",
80 "adapter_rot_args/2,down",
81 "adapter_prim_to_prim/i2i",
82 "adapter_prim_to_prim/l2i",
83 "adapter_prim_to_prim/d2f",
84 "adapter_prim_to_prim/i2l",
85 "adapter_prim_to_prim/f2d",
86 "adapter_ref_to_prim/unboxi",
87 "adapter_ref_to_prim/unboxl",
88
89 // return value handlers for collect/filter/fold adapters:
90 "return/ref",
91 "return/int",
92 "return/long",
93 "return/float",
94 "return/double",
95 "return/void",
96 "return/S0/ref",
97 "return/S1/ref",
98 "return/S2/ref",
99 "return/S3/ref",
100 "return/S4/ref",
101 "return/S5/ref",
102 "return/any",
103
104 // spreading (array length cases 0, 1, ...)
105 "adapter_spread/0",
106 "adapter_spread/1/ref",
107 "adapter_spread/2/ref",
108 "adapter_spread/3/ref",
109 "adapter_spread/4/ref",
110 "adapter_spread/5/ref",
111 "adapter_spread/ref",
112 "adapter_spread/byte",
113 "adapter_spread/char",
114 "adapter_spread/short",
115 "adapter_spread/int",
116 "adapter_spread/long",
117 "adapter_spread/float",
118 "adapter_spread/double",
119
120 // blocking filter/collect conversions:
121 "adapter_collect/ref",
122 "adapter_collect/int",
123 "adapter_collect/long",
124 "adapter_collect/float",
125 "adapter_collect/double",
126 "adapter_collect/void",
127 "adapter_collect/0/ref",
128 "adapter_collect/1/ref",
129 "adapter_collect/2/ref",
130 "adapter_collect/3/ref",
131 "adapter_collect/4/ref",
132 "adapter_collect/5/ref",
133 "adapter_filter/S0/ref",
134 "adapter_filter/S1/ref",
135 "adapter_filter/S2/ref",
136 "adapter_filter/S3/ref",
137 "adapter_filter/S4/ref",
138 "adapter_filter/S5/ref",
139 "adapter_collect/2/S0/ref",
140 "adapter_collect/2/S1/ref",
141 "adapter_collect/2/S2/ref",
142 "adapter_collect/2/S3/ref",
143 "adapter_collect/2/S4/ref",
144 "adapter_collect/2/S5/ref",
145
146 // blocking fold conversions:
147 "adapter_fold/ref",
148 "adapter_fold/int",
149 "adapter_fold/long",
150 "adapter_fold/float",
151 "adapter_fold/double",
152 "adapter_fold/void",
153 "adapter_fold/1/ref",
154 "adapter_fold/2/ref",
155 "adapter_fold/3/ref",
156 "adapter_fold/4/ref",
157 "adapter_fold/5/ref",
158
159 NULL
160 };
161
162 // Adapters.
163 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
164
165 jobject MethodHandles::_raise_exception_method;
166
167 address MethodHandles::_adapter_return_handlers[CONV_TYPE_MASK+1];
168
169 #ifdef ASSERT
170 bool MethodHandles::spot_check_entry_names() {
171 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), "");
172 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), "");
173 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), "");
174 assert(!strcmp(entry_name(_adapter_fold_args), "adapter_fold_args"), "");
175 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), "");
176 assert(!strcmp(entry_name(_adapter_opt_spread_char), "adapter_spread/char"), "");
177 assert(!strcmp(entry_name(_adapter_opt_spread_double), "adapter_spread/double"), "");
178 assert(!strcmp(entry_name(_adapter_opt_collect_int), "adapter_collect/int"), "");
179 assert(!strcmp(entry_name(_adapter_opt_collect_0_ref), "adapter_collect/0/ref"), "");
180 assert(!strcmp(entry_name(_adapter_opt_collect_2_S3_ref), "adapter_collect/2/S3/ref"), "");
181 assert(!strcmp(entry_name(_adapter_opt_filter_S5_ref), "adapter_filter/S5/ref"), "");
182 assert(!strcmp(entry_name(_adapter_opt_fold_3_ref), "adapter_fold/3/ref"), "");
183 assert(!strcmp(entry_name(_adapter_opt_fold_void), "adapter_fold/void"), "");
184 return true;
185 }
186 #endif
187
188
189 //------------------------------------------------------------------------------
190 // MethodHandles::generate_adapters
191 //
192 void MethodHandles::generate_adapters() {
193 #ifdef TARGET_ARCH_NYI_6939861
194 if (FLAG_IS_DEFAULT(UseRicochetFrames)) UseRicochetFrames = false;
195 #endif
196 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
197
198 assert(_adapter_code == NULL, "generate only once");
199
200 ResourceMark rm;
201 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
202 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
203 if (_adapter_code == NULL)
204 vm_exit_out_of_memory(adapter_code_size, "CodeCache: no room for MethodHandles adapters");
205 CodeBuffer code(_adapter_code);
206 MethodHandlesAdapterGenerator g(&code);
207 g.generate();
208 }
209
210 //------------------------------------------------------------------------------
211 // MethodHandlesAdapterGenerator::generate
212 //
213 void MethodHandlesAdapterGenerator::generate() {
214 // Generate generic method handle adapters.
215 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST;
216 ek < MethodHandles::_EK_LIMIT;
217 ek = MethodHandles::EntryKind(1 + (int)ek)) {
218 if (MethodHandles::ek_supported(ek)) {
219 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek));
220 MethodHandles::generate_method_handle_stub(_masm, ek);
221 }
222 }
223 }
224
225
226 #ifdef TARGET_ARCH_NYI_6939861
227 // these defs belong in methodHandles_<arch>.cpp
228 frame MethodHandles::ricochet_frame_sender(const frame& fr, RegisterMap *map) {
229 ShouldNotCallThis();
230 return fr;
231 }
232 void MethodHandles::ricochet_frame_oops_do(const frame& fr, OopClosure* f, const RegisterMap* reg_map) {
233 ShouldNotCallThis();
234 }
235 #endif //TARGET_ARCH_NYI_6939861
236
237
238 //------------------------------------------------------------------------------
239 // MethodHandles::ek_supported
240 //
241 bool MethodHandles::ek_supported(MethodHandles::EntryKind ek) {
242 MethodHandles::EntryKind ek_orig = MethodHandles::ek_original_kind(ek);
243 switch (ek_orig) {
244 case _adapter_unused_13:
245 return false; // not defined yet
246 case _adapter_prim_to_ref:
247 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF);
248 case _adapter_collect_args:
249 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS);
250 case _adapter_fold_args:
251 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS);
252 case _adapter_opt_return_any:
253 return UseRicochetFrames;
254 #ifdef TARGET_ARCH_NYI_6939861
255 // ports before 6939861 supported only three kinds of spread ops
256 case _adapter_spread_args:
257 // restrict spreads to three kinds:
258 switch (ek) {
259 case _adapter_opt_spread_0:
260 case _adapter_opt_spread_1:
261 case _adapter_opt_spread_more:
262 break;
263 default:
264 return false;
265 break;
266 }
267 break;
268 #endif //TARGET_ARCH_NYI_6939861
269 }
270 return true;
271 }
272
273
274 void MethodHandles::set_enabled(bool z) {
275 if (_enabled != z) {
276 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
277 _enabled = z;
278 }
279 }
280
281 // Note: A method which does not have a TRAPS argument cannot block in the GC
282 // or throw exceptions. Such methods are used in this file to do something quick
283 // and local, like parse a data structure. For speed, such methods work on plain
284 // oops, not handles. Trapping methods uniformly operate on handles.
285
286 methodHandle MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype,
287 KlassHandle& receiver_limit_result, int& decode_flags_result) {
288 if (vmtarget == NULL) return methodHandle();
289 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding");
290 if (vmindex < 0) {
291 // this DMH performs no dispatch; it is directly bound to a methodOop
292 // A MemberName may either be directly bound to a methodOop,
293 // or it may use the klass/index form; both forms mean the same thing.
294 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result);
295 if ((decode_flags_result & _dmf_has_receiver) != 0
296 && java_lang_invoke_MethodType::is_instance(mtype)) {
297 // Extract receiver type restriction from mtype.ptypes[0].
298 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype);
299 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0);
300 if (java_lang_Class::is_instance(ptype0))
301 receiver_limit_result = java_lang_Class::as_klassOop(ptype0);
302 }
303 if (vmindex == methodOopDesc::nonvirtual_vtable_index) {
304 // this DMH can be an "invokespecial" version
305 decode_flags_result &= ~_dmf_does_dispatch;
306 } else {
307 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?");
308 }
309 return m;
310 } else {
311 assert(vmtarget->is_klass(), "must be class or interface");
312 decode_flags_result |= MethodHandles::_dmf_does_dispatch;
313 decode_flags_result |= MethodHandles::_dmf_has_receiver;
314 receiver_limit_result = (klassOop)vmtarget;
315 Klass* tk = Klass::cast((klassOop)vmtarget);
316 if (tk->is_interface()) {
317 // an itable linkage is <interface, itable index>
318 decode_flags_result |= MethodHandles::_dmf_from_interface;
319 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex);
320 } else {
321 if (!tk->oop_is_instance())
322 tk = instanceKlass::cast(SystemDictionary::Object_klass());
323 return ((instanceKlass*)tk)->method_at_vtable(vmindex);
324 }
325 }
326 }
327
328 // MemberName and DirectMethodHandle have the same linkage to the JVM internals.
329 // (MemberName is the non-operational name used for queries and setup.)
330
331 methodHandle MethodHandles::decode_DirectMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
332 oop vmtarget = java_lang_invoke_DirectMethodHandle::vmtarget(mh);
333 int vmindex = java_lang_invoke_DirectMethodHandle::vmindex(mh);
334 oop mtype = java_lang_invoke_DirectMethodHandle::type(mh);
335 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result);
336 }
337
338 methodHandle MethodHandles::decode_BoundMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
339 assert(java_lang_invoke_BoundMethodHandle::is_instance(mh), "");
340 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), "");
341 for (oop bmh = mh;;) {
342 // Bound MHs can be stacked to bind several arguments.
343 oop target = java_lang_invoke_MethodHandle::vmtarget(bmh);
344 if (target == NULL) return methodHandle();
345 decode_flags_result |= MethodHandles::_dmf_binds_argument;
346 klassOop tk = target->klass();
347 if (tk == SystemDictionary::BoundMethodHandle_klass()) {
348 bmh = target;
349 continue;
350 } else {
351 if (java_lang_invoke_MethodHandle::is_subclass(tk)) {
352 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH");
353 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
354 } else {
355 // Optimized case: binding a receiver to a non-dispatched DMH
356 // short-circuits directly to the methodOop.
357 // (It might be another argument besides a receiver also.)
358 assert(target->is_method(), "must be a simple method");
359 decode_flags_result |= MethodHandles::_dmf_binds_method;
360 methodOop m = (methodOop) target;
361 if (!m->is_static())
362 decode_flags_result |= MethodHandles::_dmf_has_receiver;
363 return m;
364 }
365 }
366 }
367 }
368
369 methodHandle MethodHandles::decode_AdapterMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
370 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), "");
371 for (oop amh = mh;;) {
372 // Adapter MHs can be stacked to convert several arguments.
373 int conv_op = adapter_conversion_op(java_lang_invoke_AdapterMethodHandle::conversion(amh));
374 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK;
375 oop target = java_lang_invoke_MethodHandle::vmtarget(amh);
376 if (target == NULL) return methodHandle();
377 klassOop tk = target->klass();
378 if (tk == SystemDictionary::AdapterMethodHandle_klass()) {
379 amh = target;
380 continue;
381 } else {
382 // must be a BMH (which will bind some more arguments) or a DMH (for the final call)
383 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
384 }
385 }
386 }
387
388 methodHandle MethodHandles::decode_MethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
389 if (mh == NULL) return methodHandle();
390 klassOop mhk = mh->klass();
391 assert(java_lang_invoke_MethodHandle::is_subclass(mhk), "must be a MethodHandle");
392 if (mhk == SystemDictionary::DirectMethodHandle_klass()) {
393 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result);
394 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) {
395 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
396 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) {
397 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result);
398 } else if (java_lang_invoke_BoundMethodHandle::is_subclass(mhk)) {
399 // could be a JavaMethodHandle (but not an adapter MH)
400 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
401 } else {
402 assert(false, "cannot parse this MH");
403 return methodHandle(); // random MH?
404 }
405 }
406
407 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) {
408 assert(m->is_method(), "");
409 if (m->is_static()) {
410 // check that signature begins '(L' or '([' (not '(I', '()', etc.)
411 Symbol* sig = m->signature();
412 BasicType recv_bt = char2type(sig->byte_at(1));
413 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')'
414 assert(sig->byte_at(0) == '(', "must be method sig");
415 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY)
416 // decode_flags_result |= _dmf_has_receiver;
417 } else {
418 // non-static method
419 decode_flags_result |= _dmf_has_receiver;
420 if (!m->can_be_statically_bound() && !m->is_initializer()) {
421 decode_flags_result |= _dmf_does_dispatch;
422 if (Klass::cast(m->method_holder())->is_interface())
423 decode_flags_result |= _dmf_from_interface;
424 }
425 }
426 return m;
427 }
428
429
430 // A trusted party is handing us a cookie to determine a method.
431 // Let's boil it down to the method oop they really want.
432 methodHandle MethodHandles::decode_method(oop x, KlassHandle& receiver_limit_result, int& decode_flags_result) {
433 decode_flags_result = 0;
434 receiver_limit_result = KlassHandle();
435 klassOop xk = x->klass();
436 if (xk == Universe::methodKlassObj()) {
437 return decode_methodOop((methodOop) x, decode_flags_result);
438 } else if (xk == SystemDictionary::MemberName_klass()) {
439 // Note: This only works if the MemberName has already been resolved.
440 return decode_MemberName(x, receiver_limit_result, decode_flags_result);
441 } else if (java_lang_invoke_MethodHandle::is_subclass(xk)) {
442 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result);
443 } else if (xk == SystemDictionary::reflect_Method_klass()) {
444 oop clazz = java_lang_reflect_Method::clazz(x);
445 int slot = java_lang_reflect_Method::slot(x);
446 klassOop k = java_lang_Class::as_klassOop(clazz);
447 if (k != NULL && Klass::cast(k)->oop_is_instance())
448 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
449 decode_flags_result);
450 } else if (xk == SystemDictionary::reflect_Constructor_klass()) {
451 oop clazz = java_lang_reflect_Constructor::clazz(x);
452 int slot = java_lang_reflect_Constructor::slot(x);
453 klassOop k = java_lang_Class::as_klassOop(clazz);
454 if (k != NULL && Klass::cast(k)->oop_is_instance())
455 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
456 decode_flags_result);
457 } else {
458 // unrecognized object
459 assert(!x->is_method(), "already checked");
460 assert(!java_lang_invoke_MemberName::is_instance(x), "already checked");
461 }
462 return methodHandle();
463 }
464
465
466 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) {
467 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass())
468 return 0; // no push/pop
469 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh);
470 int last_vmslots = 0;
471 oop last_mh = mh;
472 for (;;) {
473 oop target = java_lang_invoke_MethodHandle::vmtarget(last_mh);
474 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
475 last_vmslots = java_lang_invoke_MethodHandle::vmslots(target);
476 break;
477 } else if (!java_lang_invoke_MethodHandle::is_instance(target)) {
478 // might be klass or method
479 assert(target->is_method(), "must get here with a direct ref to method");
480 last_vmslots = methodOop(target)->size_of_parameters();
481 break;
482 }
483 last_mh = target;
484 }
485 // If I am called with fewer VM slots than my ultimate callee,
486 // it must be that I push the additionally needed slots.
487 // Likewise if am called with more VM slots, I will pop them.
488 return (last_vmslots - this_vmslots);
489 }
490
491
492 // MemberName support
493
494 // import java_lang_invoke_MemberName.*
495 enum {
496 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
497 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
498 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
499 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
500 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
501 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
502 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE,
503 VM_INDEX_UNINITIALIZED = java_lang_invoke_MemberName::VM_INDEX_UNINITIALIZED
504 };
505
506 Handle MethodHandles::new_MemberName(TRAPS) {
507 Handle empty;
508 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
509 if (!k->is_initialized()) k->initialize(CHECK_(empty));
510 return Handle(THREAD, k->allocate_instance(THREAD));
511 }
512
513 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) {
514 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) {
515 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
516 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
517 int mods = java_lang_reflect_Field::modifiers(target_oop);
518 klassOop k = java_lang_Class::as_klassOop(clazz);
519 int offset = instanceKlass::cast(k)->offset_from_fields(slot);
520 init_MemberName(mname_oop, k, accessFlags_from(mods), offset);
521 } else {
522 KlassHandle receiver_limit; int decode_flags = 0;
523 methodHandle m = MethodHandles::decode_method(target_oop, receiver_limit, decode_flags);
524 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
525 init_MemberName(mname_oop, m(), do_dispatch);
526 }
527 }
528
529 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) {
530 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD)
531 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ));
532 oop vmtarget = m;
533 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet
534 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound())
535 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch
536 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value");
537 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
538 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
539 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
540 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror());
541 }
542
543 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) {
544 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ));
545 oop vmtarget = field_holder;
546 int vmindex = offset; // determines the field uniquely when combined with static bit
547 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex");
548 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
549 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
550 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
551 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror());
552 }
553
554
555 methodHandle MethodHandles::decode_MemberName(oop mname, KlassHandle& receiver_limit_result, int& decode_flags_result) {
556 methodHandle empty;
557 int flags = java_lang_invoke_MemberName::flags(mname);
558 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return empty; // not invocable
559 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname);
560 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
561 if (vmindex == VM_INDEX_UNINITIALIZED) return empty; // not resolved
562 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result);
563 oop clazz = java_lang_invoke_MemberName::clazz(mname);
564 if (clazz != NULL && java_lang_Class::is_instance(clazz)) {
565 klassOop klass = java_lang_Class::as_klassOop(clazz);
566 if (klass != NULL) receiver_limit_result = klass;
567 }
568 return m;
569 }
570
571 // convert the external string or reflective type to an internal signature
572 Symbol* MethodHandles::convert_to_signature(oop type_str, bool polymorphic, TRAPS) {
573 if (java_lang_invoke_MethodType::is_instance(type_str)) {
574 return java_lang_invoke_MethodType::as_signature(type_str, polymorphic, CHECK_NULL);
575 } else if (java_lang_Class::is_instance(type_str)) {
576 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
577 } else if (java_lang_String::is_instance(type_str)) {
578 if (polymorphic) {
579 return java_lang_String::as_symbol(type_str, CHECK_NULL);
580 } else {
581 return java_lang_String::as_symbol_or_null(type_str);
582 }
583 } else {
584 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
585 }
586 }
587
588 // An unresolved member name is a mere symbolic reference.
589 // Resolving it plants a vmtarget/vmindex in it,
590 // which refers dirctly to JVM internals.
591 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
592 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
593 #ifdef ASSERT
594 // If this assert throws, renegotiate the sentinel value used by the Java code,
595 // so that it is distinct from any valid vtable index value, and any special
596 // values defined in methodOopDesc::VtableIndexFlag.
597 // The point of the slop is to give the Java code and the JVM some room
598 // to independently specify sentinel values.
599 const int sentinel_slop = 10;
600 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop;
601 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels");
602 #endif
603 if (java_lang_invoke_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED)
604 return; // already resolved
605 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
606 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
607 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
608 int flags = java_lang_invoke_MemberName::flags(mname());
609
610 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
611 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve");
612 }
613
614 instanceKlassHandle defc;
615 {
616 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop());
617 if (defc_klassOop == NULL) return; // a primitive; no resolution possible
618 if (!Klass::cast(defc_klassOop)->oop_is_instance()) {
619 if (!Klass::cast(defc_klassOop)->oop_is_array()) return;
620 defc_klassOop = SystemDictionary::Object_klass();
621 }
622 defc = instanceKlassHandle(THREAD, defc_klassOop);
623 }
624 if (defc.is_null()) {
625 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class");
626 }
627 defc->link_class(CHECK); // possible safepoint
628
629 // convert the external string name to an internal symbol
630 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
631 if (name == NULL) return; // no such name
632
633 Handle polymorphic_method_type;
634 bool polymorphic_signature = false;
635 if ((flags & ALL_KINDS) == IS_METHOD &&
636 (defc() == SystemDictionary::MethodHandle_klass() &&
637 methodOopDesc::is_method_handle_invoke_name(name))) {
638 polymorphic_signature = true;
639 }
640
641 // convert the external string or reflective type to an internal signature
642 TempNewSymbol type = convert_to_signature(type_str(), polymorphic_signature, CHECK);
643 if (java_lang_invoke_MethodType::is_instance(type_str()) && polymorphic_signature) {
644 polymorphic_method_type = type_str; // preserve exactly
645 }
646 if (type == NULL) return; // no such signature exists in the VM
647
648 // Time to do the lookup.
649 switch (flags & ALL_KINDS) {
650 case IS_METHOD:
651 {
652 CallInfo result;
653 {
654 EXCEPTION_MARK;
655 if ((flags & JVM_ACC_STATIC) != 0) {
656 LinkResolver::resolve_static_call(result,
657 defc, name, type, KlassHandle(), false, false, THREAD);
658 } else if (defc->is_interface()) {
659 LinkResolver::resolve_interface_call(result, Handle(), defc,
660 defc, name, type, KlassHandle(), false, false, THREAD);
661 } else {
662 LinkResolver::resolve_virtual_call(result, Handle(), defc,
663 defc, name, type, KlassHandle(), false, false, THREAD);
664 }
665 if (HAS_PENDING_EXCEPTION) {
666 CLEAR_PENDING_EXCEPTION;
667 break; // go to second chance
668 }
669 }
670 methodHandle m = result.resolved_method();
671 oop vmtarget = NULL;
672 int vmindex = methodOopDesc::nonvirtual_vtable_index;
673 if (defc->is_interface()) {
674 vmindex = klassItable::compute_itable_index(m());
675 assert(vmindex >= 0, "");
676 } else if (result.has_vtable_index()) {
677 vmindex = result.vtable_index();
678 assert(vmindex >= 0, "");
679 }
680 assert(vmindex != VM_INDEX_UNINITIALIZED, "");
681 if (vmindex < 0) {
682 assert(result.is_statically_bound(), "");
683 vmtarget = m();
684 } else {
685 vmtarget = result.resolved_klass()->as_klassOop();
686 }
687 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
688 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
689 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
690 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
691 DEBUG_ONLY(KlassHandle junk1; int junk2);
692 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(),
693 "properly stored for later decoding");
694 return;
695 }
696 case IS_CONSTRUCTOR:
697 {
698 CallInfo result;
699 {
700 EXCEPTION_MARK;
701 if (name == vmSymbols::object_initializer_name()) {
702 LinkResolver::resolve_special_call(result,
703 defc, name, type, KlassHandle(), false, THREAD);
704 } else {
705 break; // will throw after end of switch
706 }
707 if (HAS_PENDING_EXCEPTION) {
708 CLEAR_PENDING_EXCEPTION;
709 return;
710 }
711 }
712 assert(result.is_statically_bound(), "");
713 methodHandle m = result.resolved_method();
714 oop vmtarget = m();
715 int vmindex = methodOopDesc::nonvirtual_vtable_index;
716 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
717 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
718 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
719 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
720 DEBUG_ONLY(KlassHandle junk1; int junk2);
721 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(),
722 "properly stored for later decoding");
723 return;
724 }
725 case IS_FIELD:
726 {
727 // This is taken from LinkResolver::resolve_field, sans access checks.
728 fieldDescriptor fd; // find_field initializes fd if found
729 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd));
730 // check if field exists; i.e., if a klass containing the field def has been selected
731 if (sel_klass.is_null()) return;
732 oop vmtarget = sel_klass->as_klassOop();
733 int vmindex = fd.offset();
734 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS);
735 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen
736 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
737 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
738 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
739 return;
740 }
741 default:
742 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
743 }
744
745 // Second chance.
746 if (polymorphic_method_type.not_null()) {
747 // Look on a non-null class loader.
748 Handle cur_class_loader;
749 const int nptypes = java_lang_invoke_MethodType::ptype_count(polymorphic_method_type());
750 for (int i = 0; i <= nptypes; i++) {
751 oop type_mirror;
752 if (i < nptypes) type_mirror = java_lang_invoke_MethodType::ptype(polymorphic_method_type(), i);
753 else type_mirror = java_lang_invoke_MethodType::rtype(polymorphic_method_type());
754 klassOop example_type = java_lang_Class::as_klassOop(type_mirror);
755 if (example_type == NULL) continue;
756 oop class_loader = Klass::cast(example_type)->class_loader();
757 if (class_loader == NULL || class_loader == cur_class_loader()) continue;
758 cur_class_loader = Handle(THREAD, class_loader);
759 methodOop m = SystemDictionary::find_method_handle_invoke(name,
760 type,
761 KlassHandle(THREAD, example_type),
762 THREAD);
763 if (HAS_PENDING_EXCEPTION) {
764 CLEAR_PENDING_EXCEPTION;
765 m = NULL;
766 // try again with a different class loader...
767 }
768 if (m != NULL) {
769 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
770 java_lang_invoke_MemberName::set_vmtarget(mname(), m);
771 java_lang_invoke_MemberName::set_vmindex(mname(), m->vtable_index());
772 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
773 return;
774 }
775 }
776 }
777 }
778
779 // Conversely, a member name which is only initialized from JVM internals
780 // may have null defc, name, and type fields.
781 // Resolving it plants a vmtarget/vmindex in it,
782 // which refers directly to JVM internals.
783 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
784 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
785 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
786 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
787 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) {
788 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
789 }
790
791 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
792 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
793 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
794 int flags = java_lang_invoke_MemberName::flags(mname());
795
796 if (suppress != 0) {
797 if (suppress & _suppress_defc) have_defc = true;
798 if (suppress & _suppress_name) have_name = true;
799 if (suppress & _suppress_type) have_type = true;
800 }
801
802 if (have_defc && have_name && have_type) return; // nothing needed
803
804 switch (flags & ALL_KINDS) {
805 case IS_METHOD:
806 case IS_CONSTRUCTOR:
807 {
808 KlassHandle receiver_limit; int decode_flags = 0;
809 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit, decode_flags);
810 if (m.is_null()) break;
811 if (!have_defc) {
812 klassOop defc = m->method_holder();
813 if (receiver_limit.not_null() && receiver_limit() != defc
814 && Klass::cast(receiver_limit())->is_subtype_of(defc))
815 defc = receiver_limit();
816 java_lang_invoke_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror());
817 }
818 if (!have_name) {
819 //not java_lang_String::create_from_symbol; let's intern member names
820 Handle name = StringTable::intern(m->name(), CHECK);
821 java_lang_invoke_MemberName::set_name(mname(), name());
822 }
823 if (!have_type) {
824 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
825 java_lang_invoke_MemberName::set_type(mname(), type());
826 }
827 return;
828 }
829 case IS_FIELD:
830 {
831 // This is taken from LinkResolver::resolve_field, sans access checks.
832 if (!vmtarget->is_klass()) break;
833 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break;
834 instanceKlassHandle defc(THREAD, (klassOop) vmtarget);
835 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
836 fieldDescriptor fd; // find_field initializes fd if found
837 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
838 break; // cannot expand
839 if (!have_defc) {
840 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
841 }
842 if (!have_name) {
843 //not java_lang_String::create_from_symbol; let's intern member names
844 Handle name = StringTable::intern(fd.name(), CHECK);
845 java_lang_invoke_MemberName::set_name(mname(), name());
846 }
847 if (!have_type) {
848 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
849 java_lang_invoke_MemberName::set_type(mname(), type());
850 }
851 return;
852 }
853 }
854 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
855 }
856
857 int MethodHandles::find_MemberNames(klassOop k,
858 Symbol* name, Symbol* sig,
859 int mflags, klassOop caller,
860 int skip, objArrayOop results) {
861 DEBUG_ONLY(No_Safepoint_Verifier nsv);
862 // this code contains no safepoints!
863
864 // %%% take caller into account!
865
866 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1;
867
868 int rfill = 0, rlimit = results->length(), rskip = skip;
869 // overflow measurement:
870 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
871
872 int match_flags = mflags;
873 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
874 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
875 bool local_only = !(search_superc | search_intfc);
876 bool classes_only = false;
877
878 if (name != NULL) {
879 if (name->utf8_length() == 0) return 0; // a match is not possible
880 }
881 if (sig != NULL) {
882 if (sig->utf8_length() == 0) return 0; // a match is not possible
883 if (sig->byte_at(0) == '(')
884 match_flags &= ~(IS_FIELD | IS_TYPE);
885 else
886 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
887 }
888
889 if ((match_flags & IS_TYPE) != 0) {
890 // NYI, and Core Reflection works quite well for this query
891 }
892
893 if ((match_flags & IS_FIELD) != 0) {
894 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
895 if (name != NULL && st.name() != name)
896 continue;
897 if (sig != NULL && st.signature() != sig)
898 continue;
899 // passed the filters
900 if (rskip > 0) {
901 --rskip;
902 } else if (rfill < rlimit) {
903 oop result = results->obj_at(rfill++);
904 if (!java_lang_invoke_MemberName::is_instance(result))
905 return -99; // caller bug!
906 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset());
907 } else if (++overflow >= overflow_limit) {
908 match_flags = 0; break; // got tired of looking at overflow
909 }
910 }
911 }
912
913 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
914 // watch out for these guys:
915 Symbol* init_name = vmSymbols::object_initializer_name();
916 Symbol* clinit_name = vmSymbols::class_initializer_name();
917 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
918 bool negate_name_test = false;
919 // fix name so that it captures the intention of IS_CONSTRUCTOR
920 if (!(match_flags & IS_METHOD)) {
921 // constructors only
922 if (name == NULL) {
923 name = init_name;
924 } else if (name != init_name) {
925 return 0; // no constructors of this method name
926 }
927 } else if (!(match_flags & IS_CONSTRUCTOR)) {
928 // methods only
929 if (name == NULL) {
930 name = init_name;
931 negate_name_test = true; // if we see the name, we *omit* the entry
932 } else if (name == init_name) {
933 return 0; // no methods of this constructor name
934 }
935 } else {
936 // caller will accept either sort; no need to adjust name
937 }
938 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
939 methodOop m = st.method();
940 Symbol* m_name = m->name();
941 if (m_name == clinit_name)
942 continue;
943 if (name != NULL && ((m_name != name) ^ negate_name_test))
944 continue;
945 if (sig != NULL && m->signature() != sig)
946 continue;
947 // passed the filters
948 if (rskip > 0) {
949 --rskip;
950 } else if (rfill < rlimit) {
951 oop result = results->obj_at(rfill++);
952 if (!java_lang_invoke_MemberName::is_instance(result))
953 return -99; // caller bug!
954 MethodHandles::init_MemberName(result, m, true);
955 } else if (++overflow >= overflow_limit) {
956 match_flags = 0; break; // got tired of looking at overflow
957 }
958 }
959 }
960
961 // return number of elements we at leasted wanted to initialize
962 return rfill + overflow;
963 }
964
965
966 // Decode this java.lang.Class object into an instanceKlass, if possible.
967 // Throw IAE if not
968 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) {
969 instanceKlassHandle empty;
970 klassOop caller = NULL;
971 if (java_lang_Class::is_instance(java_mirror_oop)) {
972 caller = java_lang_Class::as_klassOop(java_mirror_oop);
973 }
974 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) {
975 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty);
976 }
977 return instanceKlassHandle(THREAD, caller);
978 }
979
980
981
982 // Decode the vmtarget field of a method handle.
983 // Sanitize out methodOops, klassOops, and any other non-Java data.
984 // This is for debugging and reflection.
985 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) {
986 assert(java_lang_invoke_MethodHandle::is_instance(mh()), "must be a MH");
987 if (format == ETF_HANDLE_OR_METHOD_NAME) {
988 oop target = java_lang_invoke_MethodHandle::vmtarget(mh());
989 if (target == NULL) {
990 return NULL; // unformed MH
991 }
992 klassOop tklass = target->klass();
993 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) {
994 return target; // target is another MH (or something else?)
995 }
996 }
997 if (format == ETF_DIRECT_HANDLE) {
998 oop target = mh();
999 for (;;) {
1000 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
1001 return target;
1002 }
1003 if (!java_lang_invoke_MethodHandle::is_instance(target)){
1004 return NULL; // unformed MH
1005 }
1006 target = java_lang_invoke_MethodHandle::vmtarget(target);
1007 }
1008 }
1009 // cases of metadata in MH.vmtarget:
1010 // - AMH can have methodOop for static invoke with bound receiver
1011 // - DMH can have methodOop for static invoke (on variable receiver)
1012 // - DMH can have klassOop for dispatched (non-static) invoke
1013 KlassHandle receiver_limit; int decode_flags = 0;
1014 methodHandle m = decode_MethodHandle(mh(), receiver_limit, decode_flags);
1015 if (m.is_null()) return NULL;
1016 switch (format) {
1017 case ETF_REFLECT_METHOD:
1018 // same as jni_ToReflectedMethod:
1019 if (m->is_initializer()) {
1020 return Reflection::new_constructor(m, THREAD);
1021 } else {
1022 return Reflection::new_method(m, UseNewReflection, false, THREAD);
1023 }
1024
1025 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle
1026 case ETF_METHOD_NAME:
1027 {
1028 if (SystemDictionary::MemberName_klass() == NULL) break;
1029 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass());
1030 mname_klass->initialize(CHECK_NULL);
1031 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); // possible safepoint
1032 java_lang_invoke_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED);
1033 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
1034 init_MemberName(mname(), m(), do_dispatch);
1035 expand_MemberName(mname, 0, CHECK_NULL);
1036 return mname();
1037 }
1038 }
1039
1040 // Unknown format code.
1041 char msg[50];
1042 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format);
1043 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg);
1044 }
1045
1046 static const char* always_null_names[] = {
1047 "java/lang/Void",
1048 "java/lang/Null",
1049 //"java/lang/Nothing",
1050 "sun/dyn/empty/Empty",
1051 "sun/invoke/empty/Empty",
1052 NULL
1053 };
1054
1055 static bool is_always_null_type(klassOop klass) {
1056 if (klass == NULL) return false; // safety
1057 if (!Klass::cast(klass)->oop_is_instance()) return false;
1058 instanceKlass* ik = instanceKlass::cast(klass);
1059 // Must be on the boot class path:
1060 if (ik->class_loader() != NULL) return false;
1061 // Check the name.
1062 Symbol* name = ik->name();
1063 for (int i = 0; ; i++) {
1064 const char* test_name = always_null_names[i];
1065 if (test_name == NULL) break;
1066 if (name->equals(test_name))
1067 return true;
1068 }
1069 return false;
1070 }
1071
1072 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) {
1073 if (dst == NULL) return true;
1074 if (src == NULL) return (dst != SystemDictionary::Object_klass());
1075 if (src == dst || dst == SystemDictionary::Object_klass())
1076 return false; // quickest checks
1077 Klass* srck = Klass::cast(src);
1078 Klass* dstk = Klass::cast(dst);
1079 if (dstk->is_interface()) {
1080 // interface receivers can safely be viewed as untyped,
1081 // because interface calls always include a dynamic check
1082 //dstk = Klass::cast(SystemDictionary::Object_klass());
1083 return false;
1084 }
1085 if (srck->is_interface()) {
1086 // interface arguments must be viewed as untyped
1087 //srck = Klass::cast(SystemDictionary::Object_klass());
1088 return true;
1089 }
1090 if (is_always_null_type(src)) {
1091 // some source types are known to be never instantiated;
1092 // they represent references which are always null
1093 // such null references never fail to convert safely
1094 return false;
1095 }
1096 return !srck->is_subclass_of(dstk->as_klassOop());
1097 }
1098
1099 static oop object_java_mirror() {
1100 return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
1101 }
1102
1103 bool MethodHandles::is_float_fixed_reinterpretation_cast(BasicType src, BasicType dst) {
1104 if (src == T_FLOAT) return dst == T_INT;
1105 if (src == T_INT) return dst == T_FLOAT;
1106 if (src == T_DOUBLE) return dst == T_LONG;
1107 if (src == T_LONG) return dst == T_DOUBLE;
1108 return false;
1109 }
1110
1111 bool MethodHandles::same_basic_type_for_arguments(BasicType src,
1112 BasicType dst,
1113 bool raw,
1114 bool for_return) {
1115 if (for_return) {
1116 // return values can always be forgotten:
1117 if (dst == T_VOID) return true;
1118 if (src == T_VOID) return raw && (dst == T_INT);
1119 // We allow caller to receive a garbage int, which is harmless.
1120 // This trick is pulled by trusted code (see VerifyType.canPassRaw).
1121 }
1122 assert(src != T_VOID && dst != T_VOID, "should not be here");
1123 if (src == dst) return true;
1124 if (type2size[src] != type2size[dst]) return false;
1125 if (src == T_OBJECT || dst == T_OBJECT) return false;
1126 if (raw) return true; // bitwise reinterpretation; caller guarantees safety
1127 // allow reinterpretation casts for integral widening
1128 if (is_subword_type(src)) { // subwords can fit in int or other subwords
1129 if (dst == T_INT) // any subword fits in an int
1130 return true;
1131 if (src == T_BOOLEAN) // boolean fits in any subword
1132 return is_subword_type(dst);
1133 if (src == T_BYTE && dst == T_SHORT)
1134 return true; // remaining case: byte fits in short
1135 }
1136 // allow float/fixed reinterpretation casts
1137 if (is_float_fixed_reinterpretation_cast(src, dst))
1138 return true;
1139 return false;
1140 }
1141
1142 const char* MethodHandles::check_method_receiver(methodOop m,
1143 klassOop passed_recv_type) {
1144 assert(!m->is_static(), "caller resp.");
1145 if (passed_recv_type == NULL)
1146 return "receiver type is primitive";
1147 if (class_cast_needed(passed_recv_type, m->method_holder())) {
1148 Klass* formal = Klass::cast(m->method_holder());
1149 return SharedRuntime::generate_class_cast_message("receiver type",
1150 formal->external_name());
1151 }
1152 return NULL; // checks passed
1153 }
1154
1155 // Verify that m's signature can be called type-safely by a method handle
1156 // of the given method type 'mtype'.
1157 // It takes a TRAPS argument because it must perform symbol lookups.
1158 void MethodHandles::verify_method_signature(methodHandle m,
1159 Handle mtype,
1160 int first_ptype_pos,
1161 KlassHandle insert_ptype,
1162 TRAPS) {
1163 Handle mhi_type;
1164 if (m->is_method_handle_invoke()) {
1165 // use this more exact typing instead of the symbolic signature:
1166 mhi_type = Handle(THREAD, m->method_handle_type());
1167 }
1168 objArrayHandle ptypes(THREAD, java_lang_invoke_MethodType::ptypes(mtype()));
1169 int pnum = first_ptype_pos;
1170 int pmax = ptypes->length();
1171 int anum = 0; // method argument
1172 const char* err = NULL;
1173 ResourceMark rm(THREAD);
1174 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
1175 oop ptype_oop = NULL;
1176 if (ss.at_return_type()) {
1177 if (pnum != pmax)
1178 { err = "too many arguments"; break; }
1179 ptype_oop = java_lang_invoke_MethodType::rtype(mtype());
1180 } else {
1181 if (pnum >= pmax)
1182 { err = "not enough arguments"; break; }
1183 if (pnum >= 0)
1184 ptype_oop = ptypes->obj_at(pnum);
1185 else if (insert_ptype.is_null())
1186 ptype_oop = NULL;
1187 else
1188 ptype_oop = insert_ptype->java_mirror();
1189 pnum += 1;
1190 anum += 1;
1191 }
1192 KlassHandle pklass;
1193 BasicType ptype = T_OBJECT;
1194 bool have_ptype = false;
1195 // missing ptype_oop does not match any non-reference; use Object to report the error
1196 pklass = SystemDictionaryHandles::Object_klass();
1197 if (ptype_oop != NULL) {
1198 have_ptype = true;
1199 klassOop pklass_oop = NULL;
1200 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass_oop);
1201 pklass = KlassHandle(THREAD, pklass_oop);
1202 }
1203 ptype_oop = NULL; //done with this
1204 KlassHandle aklass;
1205 BasicType atype = ss.type();
1206 if (atype == T_ARRAY) atype = T_OBJECT; // fold all refs to T_OBJECT
1207 if (atype == T_OBJECT) {
1208 if (!have_ptype) {
1209 // null matches any reference
1210 continue;
1211 }
1212 if (mhi_type.is_null()) {
1213 // If we fail to resolve types at this point, we will usually throw an error.
1214 TempNewSymbol name = ss.as_symbol_or_null();
1215 if (name != NULL) {
1216 instanceKlass* mk = instanceKlass::cast(m->method_holder());
1217 Handle loader(THREAD, mk->class_loader());
1218 Handle domain(THREAD, mk->protection_domain());
1219 klassOop aklass_oop = SystemDictionary::resolve_or_null(name, loader, domain, CHECK);
1220 if (aklass_oop != NULL)
1221 aklass = KlassHandle(THREAD, aklass_oop);
1222 }
1223 } else {
1224 // for method handle invokers we don't look at the name in the signature
1225 oop atype_oop;
1226 if (ss.at_return_type())
1227 atype_oop = java_lang_invoke_MethodType::rtype(mhi_type());
1228 else
1229 atype_oop = java_lang_invoke_MethodType::ptype(mhi_type(), anum-1);
1230 klassOop aklass_oop = NULL;
1231 atype = java_lang_Class::as_BasicType(atype_oop, &aklass_oop);
1232 aklass = KlassHandle(THREAD, aklass_oop);
1233 }
1234 }
1235 if (!ss.at_return_type()) {
1236 err = check_argument_type_change(ptype, pklass(), atype, aklass(), anum);
1237 } else {
1238 err = check_return_type_change(atype, aklass(), ptype, pklass()); // note reversal!
1239 }
1240 if (err != NULL) break;
1241 }
1242
1243 if (err != NULL) {
1244 #ifndef PRODUCT
1245 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1246 tty->print("*** verify_method_signature failed: ");
1247 java_lang_invoke_MethodType::print_signature(mtype(), tty);
1248 tty->cr();
1249 tty->print_cr(" first_ptype_pos = %d, insert_ptype = "UINTX_FORMAT, first_ptype_pos, insert_ptype());
1250 tty->print(" Failing method: ");
1251 m->print();
1252 }
1253 #endif //PRODUCT
1254 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1255 }
1256 }
1257
1258 // Main routine for verifying the MethodHandle.type of a proposed
1259 // direct or bound-direct method handle.
1260 void MethodHandles::verify_method_type(methodHandle m,
1261 Handle mtype,
1262 bool has_bound_recv,
1263 KlassHandle bound_recv_type,
1264 TRAPS) {
1265 bool m_needs_receiver = !m->is_static();
1266
1267 const char* err = NULL;
1268
1269 int first_ptype_pos = m_needs_receiver ? 1 : 0;
1270 if (has_bound_recv) {
1271 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them
1272 if (m_needs_receiver && bound_recv_type.is_null())
1273 { err = "bound receiver is not an object"; goto die; }
1274 }
1275
1276 if (m_needs_receiver && err == NULL) {
1277 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype());
1278 if (ptypes->length() < first_ptype_pos)
1279 { err = "receiver argument is missing"; goto die; }
1280 if (has_bound_recv)
1281 err = check_method_receiver(m(), bound_recv_type->as_klassOop());
1282 else
1283 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1)));
1284 if (err != NULL) goto die;
1285 }
1286
1287 // Check the other arguments for mistypes.
1288 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK);
1289 return;
1290
1291 die:
1292 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1293 }
1294
1295 void MethodHandles::verify_vmslots(Handle mh, TRAPS) {
1296 // Verify vmslots.
1297 int check_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(mh()));
1298 if (java_lang_invoke_MethodHandle::vmslots(mh()) != check_slots) {
1299 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH");
1300 }
1301 }
1302
1303 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) {
1304 // Verify that argslot points at the given argnum.
1305 int check_slot = argument_slot(java_lang_invoke_MethodHandle::type(mh()), argnum);
1306 if (argslot != check_slot || argslot < 0) {
1307 ResourceMark rm;
1308 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d";
1309 size_t msglen = strlen(fmt) + 3*11 + 1;
1310 char* msg = NEW_RESOURCE_ARRAY(char, msglen);
1311 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot);
1312 THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
1313 }
1314 }
1315
1316 // Verify the correspondence between two method types.
1317 // Apart from the advertised changes, caller method type X must
1318 // be able to invoke the callee method Y type with no violations
1319 // of type integrity.
1320 // Return NULL if all is well, else a short error message.
1321 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end,
1322 int insert_argnum, oop insert_type,
1323 int change_argnum, oop change_type,
1324 int delete_argnum,
1325 oop dst_mtype, int dst_beg, int dst_end,
1326 bool raw) {
1327 objArrayOop src_ptypes = java_lang_invoke_MethodType::ptypes(src_mtype);
1328 objArrayOop dst_ptypes = java_lang_invoke_MethodType::ptypes(dst_mtype);
1329
1330 int src_max = src_ptypes->length();
1331 int dst_max = dst_ptypes->length();
1332
1333 if (src_end == -1) src_end = src_max;
1334 if (dst_end == -1) dst_end = dst_max;
1335
1336 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob");
1337 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob");
1338
1339 // pending actions; set to -1 when done:
1340 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum;
1341
1342 const char* err = NULL;
1343
1344 // Walk along each array of parameter types, including a virtual
1345 // NULL end marker at the end of each.
1346 for (int src_idx = src_beg, dst_idx = dst_beg;
1347 (src_idx <= src_end && dst_idx <= dst_end);
1348 src_idx++, dst_idx++) {
1349 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx);
1350 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx);
1351 bool fix_null_src_type = false;
1352
1353 // Perform requested edits.
1354 if (ins_idx == src_idx) {
1355 // note that the inserted guy is never affected by a change or deletion
1356 ins_idx = -1;
1357 src_type = insert_type;
1358 fix_null_src_type = true;
1359 --src_idx; // back up to process src type on next loop
1360 src_idx = src_end;
1361 } else {
1362 // note that the changed guy can be immediately deleted
1363 if (chg_idx == src_idx) {
1364 chg_idx = -1;
1365 assert(src_idx < src_end, "oob");
1366 src_type = change_type;
1367 fix_null_src_type = true;
1368 }
1369 if (del_idx == src_idx) {
1370 del_idx = -1;
1371 assert(src_idx < src_end, "oob");
1372 --dst_idx;
1373 continue; // rerun loop after skipping this position
1374 }
1375 }
1376
1377 if (src_type == NULL && fix_null_src_type)
1378 // explicit null in this case matches any dest reference
1379 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type);
1380
1381 // Compare the two argument types.
1382 if (src_type != dst_type) {
1383 if (src_type == NULL) return "not enough arguments";
1384 if (dst_type == NULL) return "too many arguments";
1385 err = check_argument_type_change(src_type, dst_type, dst_idx, raw);
1386 if (err != NULL) return err;
1387 }
1388 }
1389
1390 // Now compare return types also.
1391 oop src_rtype = java_lang_invoke_MethodType::rtype(src_mtype);
1392 oop dst_rtype = java_lang_invoke_MethodType::rtype(dst_mtype);
1393 if (src_rtype != dst_rtype) {
1394 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal!
1395 if (err != NULL) return err;
1396 }
1397
1398 assert(err == NULL, "");
1399 return NULL; // all is well
1400 }
1401
1402
1403 const char* MethodHandles::check_argument_type_change(BasicType src_type,
1404 klassOop src_klass,
1405 BasicType dst_type,
1406 klassOop dst_klass,
1407 int argnum,
1408 bool raw) {
1409 const char* err = NULL;
1410 const bool for_return = (argnum < 0);
1411
1412 // just in case:
1413 if (src_type == T_ARRAY) src_type = T_OBJECT;
1414 if (dst_type == T_ARRAY) dst_type = T_OBJECT;
1415
1416 // Produce some nice messages if VerifyMethodHandles is turned on:
1417 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) {
1418 if (src_type == T_OBJECT) {
1419 if (raw && is_java_primitive(dst_type))
1420 return NULL; // ref-to-prim discards ref and returns zero
1421 err = (!for_return
1422 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s"
1423 : "type mismatch: returning a %s, but caller expects primitive %s");
1424 } else if (dst_type == T_OBJECT) {
1425 err = (!for_return
1426 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s"
1427 : "type mismatch: returning a primitive %s, but caller expects %s");
1428 } else {
1429 err = (!for_return
1430 ? "type mismatch: passing a %s for method argument #%d, which expects %s"
1431 : "type mismatch: returning a %s, but caller expects %s");
1432 }
1433 } else if (src_type == T_OBJECT && dst_type == T_OBJECT &&
1434 class_cast_needed(src_klass, dst_klass)) {
1435 if (!class_cast_needed(dst_klass, src_klass)) {
1436 if (raw)
1437 return NULL; // reverse cast is OK; the MH target is trusted to enforce it
1438 err = (!for_return
1439 ? "cast required: passing a %s for method argument #%d, which expects %s"
1440 : "cast required: returning a %s, but caller expects %s");
1441 } else {
1442 err = (!for_return
1443 ? "reference mismatch: passing a %s for method argument #%d, which expects %s"
1444 : "reference mismatch: returning a %s, but caller expects %s");
1445 }
1446 } else {
1447 // passed the obstacle course
1448 return NULL;
1449 }
1450
1451 // format, format, format
1452 const char* src_name = type2name(src_type);
1453 const char* dst_name = type2name(dst_type);
1454 if (src_name == NULL) src_name = "unknown type";
1455 if (dst_name == NULL) dst_name = "unknown type";
1456 if (src_type == T_OBJECT)
1457 src_name = (src_klass != NULL) ? Klass::cast(src_klass)->external_name() : "an unresolved class";
1458 if (dst_type == T_OBJECT)
1459 dst_name = (dst_klass != NULL) ? Klass::cast(dst_klass)->external_name() : "an unresolved class";
1460
1461 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11);
1462 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1);
1463 if (!for_return) {
1464 assert(strstr(err, "%d") != NULL, "");
1465 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name);
1466 } else {
1467 assert(strstr(err, "%d") == NULL, "");
1468 jio_snprintf(msg, msglen, err, src_name, dst_name);
1469 }
1470 return msg;
1471 }
1472
1473 // Compute the depth within the stack of the given argument, i.e.,
1474 // the combined size of arguments to the right of the given argument.
1475 // For the last argument (ptypes.length-1) this will be zero.
1476 // For the first argument (0) this will be the size of all
1477 // arguments but that one. For the special number -1, this
1478 // will be the size of all arguments, including the first.
1479 // If the argument is neither -1 nor a valid argument index,
1480 // then return a negative number. Otherwise, the result
1481 // is in the range [0..vmslots] inclusive.
1482 int MethodHandles::argument_slot(oop method_type, int arg) {
1483 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type);
1484 int argslot = 0;
1485 int len = ptypes->length();
1486 if (arg < -1 || arg >= len) return -99;
1487 for (int i = len-1; i > arg; i--) {
1488 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1489 argslot += type2size[bt];
1490 }
1491 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works");
1492 return argslot;
1493 }
1494
1495 // Given a slot number, return the argument number.
1496 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) {
1497 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type);
1498 int argslot = 0;
1499 int len = ptypes->length();
1500 for (int i = len-1; i >= 0; i--) {
1501 if (query_argslot == argslot) return i;
1502 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1503 argslot += type2size[bt];
1504 }
1505 // return pseudo-arg deepest in stack:
1506 if (query_argslot == argslot) return -1;
1507 return -99; // oob slot, or splitting a double-slot arg
1508 }
1509
1510 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m,
1511 KlassHandle receiver_limit,
1512 int decode_flags,
1513 KlassHandle receiver_klass,
1514 TRAPS) {
1515 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference");
1516 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument");
1517
1518 if (!m->is_static() &&
1519 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder())))
1520 // given type does not match class of method, or receiver is null!
1521 // caller should have checked this, but let's be extra careful...
1522 return methodHandle();
1523
1524 if (receiver_limit.not_null() &&
1525 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit())))
1526 // given type is not limited to the receiver type
1527 // note that a null receiver can match any reference value, for a static method
1528 return methodHandle();
1529
1530 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) {
1531 // pre-dispatched or static method (null receiver is OK for static)
1532 return m;
1533
1534 } else if (receiver_klass.is_null()) {
1535 // null receiver value; cannot dispatch
1536 return methodHandle();
1537
1538 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) {
1539 // perform virtual dispatch
1540 int vtable_index = m->vtable_index();
1541 guarantee(vtable_index >= 0, "valid vtable index");
1542
1543 // receiver_klass might be an arrayKlassOop but all vtables start at
1544 // the same place. The cast is to avoid virtual call and assertion.
1545 // See also LinkResolver::runtime_resolve_virtual_method.
1546 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass());
1547 DEBUG_ONLY(inst->verify_vtable_index(vtable_index));
1548 methodOop m_oop = inst->method_at_vtable(vtable_index);
1549 return methodHandle(THREAD, m_oop);
1550
1551 } else {
1552 // perform interface dispatch
1553 int itable_index = klassItable::compute_itable_index(m());
1554 guarantee(itable_index >= 0, "valid itable index");
1555 instanceKlass* inst = instanceKlass::cast(receiver_klass());
1556 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD);
1557 return methodHandle(THREAD, m_oop);
1558 }
1559 }
1560
1561 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) {
1562 // Verify type.
1563 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1564 verify_method_type(m, mtype, false, KlassHandle(), CHECK);
1565
1566 // Verify vmslots.
1567 if (java_lang_invoke_MethodHandle::vmslots(mh()) != m->size_of_parameters()) {
1568 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH");
1569 }
1570 }
1571
1572 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) {
1573 // Check arguments.
1574 if (mh.is_null() || m.is_null() ||
1575 (!do_dispatch && m->is_abstract())) {
1576 THROW(vmSymbols::java_lang_InternalError());
1577 }
1578
1579 java_lang_invoke_MethodHandle::init_vmslots(mh());
1580
1581 if (VerifyMethodHandles) {
1582 // The privileged code which invokes this routine should not make
1583 // a mistake about types, but it's better to verify.
1584 verify_DirectMethodHandle(mh, m, CHECK);
1585 }
1586
1587 // Finally, after safety checks are done, link to the target method.
1588 // We will follow the same path as the latter part of
1589 // InterpreterRuntime::resolve_invoke(), which first finds the method
1590 // and then decides how to populate the constant pool cache entry
1591 // that links the interpreter calls to the method. We need the same
1592 // bits, and will use the same calling sequence code.
1593
1594 int vmindex = methodOopDesc::garbage_vtable_index;
1595 Handle vmtarget;
1596
1597 instanceKlass::cast(m->method_holder())->link_class(CHECK);
1598
1599 MethodHandleEntry* me = NULL;
1600 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) {
1601 // We are simulating an invokeinterface instruction.
1602 // (We might also be simulating an invokevirtual on a miranda method,
1603 // but it is safe to treat it as an invokeinterface.)
1604 assert(!m->can_be_statically_bound(), "no final methods on interfaces");
1605 vmindex = klassItable::compute_itable_index(m());
1606 assert(vmindex >= 0, "(>=0) == do_dispatch");
1607 // Set up same bits as ConstantPoolCacheEntry::set_interface_call().
1608 vmtarget = m->method_holder(); // the interface
1609 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh);
1610 } else if (!do_dispatch || m->can_be_statically_bound()) {
1611 // We are simulating an invokestatic or invokespecial instruction.
1612 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method().
1613 vmtarget = m;
1614 // this does not help dispatch, but it will make it possible to parse this MH:
1615 vmindex = methodOopDesc::nonvirtual_vtable_index;
1616 assert(vmindex < 0, "(>=0) == do_dispatch");
1617 if (!m->is_static()) {
1618 me = MethodHandles::entry(MethodHandles::_invokespecial_mh);
1619 } else {
1620 me = MethodHandles::entry(MethodHandles::_invokestatic_mh);
1621 // Part of the semantics of a static call is an initialization barrier.
1622 // For a DMH, it is done now, when the handle is created.
1623 Klass* k = Klass::cast(m->method_holder());
1624 if (k->should_be_initialized()) {
1625 k->initialize(CHECK); // possible safepoint
1626 }
1627 }
1628 } else {
1629 // We are simulating an invokevirtual instruction.
1630 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method().
1631 // The key logic is LinkResolver::runtime_resolve_virtual_method.
1632 vmindex = m->vtable_index();
1633 vmtarget = m->method_holder();
1634 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh);
1635 }
1636
1637 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
1638
1639 java_lang_invoke_DirectMethodHandle::set_vmtarget(mh(), vmtarget());
1640 java_lang_invoke_DirectMethodHandle::set_vmindex( mh(), vmindex);
1641 DEBUG_ONLY(KlassHandle rlimit; int flags);
1642 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m,
1643 "properly stored for later decoding");
1644 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0));
1645 assert(!(actual_do_dispatch && !do_dispatch),
1646 "do not perform dispatch if !do_dispatch specified");
1647 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch");
1648 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack");
1649
1650 // Done!
1651 java_lang_invoke_MethodHandle::set_vmentry(mh(), me);
1652 }
1653
1654 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh,
1655 methodHandle m,
1656 TRAPS) {
1657 // Verify type.
1658 KlassHandle bound_recv_type;
1659 {
1660 oop receiver = java_lang_invoke_BoundMethodHandle::argument(mh());
1661 if (receiver != NULL)
1662 bound_recv_type = KlassHandle(THREAD, receiver->klass());
1663 }
1664 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1665 verify_method_type(m, mtype, true, bound_recv_type, CHECK);
1666
1667 int receiver_pos = m->size_of_parameters() - 1;
1668
1669 // Verify MH.vmargslot, which should point at the bound receiver.
1670 verify_vmargslot(mh, -1, java_lang_invoke_BoundMethodHandle::vmargslot(mh()), CHECK);
1671 //verify_vmslots(mh, CHECK);
1672
1673 // Verify vmslots.
1674 if (java_lang_invoke_MethodHandle::vmslots(mh()) != receiver_pos) {
1675 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)");
1676 }
1677 }
1678
1679 // Initialize a BMH with a receiver bound directly to a methodOop.
1680 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh,
1681 methodHandle original_m,
1682 KlassHandle receiver_limit,
1683 int decode_flags,
1684 TRAPS) {
1685 // Check arguments.
1686 if (mh.is_null() || original_m.is_null()) {
1687 THROW(vmSymbols::java_lang_InternalError());
1688 }
1689
1690 KlassHandle receiver_klass;
1691 {
1692 oop receiver_oop = java_lang_invoke_BoundMethodHandle::argument(mh());
1693 if (receiver_oop != NULL)
1694 receiver_klass = KlassHandle(THREAD, receiver_oop->klass());
1695 }
1696 methodHandle m = dispatch_decoded_method(original_m,
1697 receiver_limit, decode_flags,
1698 receiver_klass,
1699 CHECK);
1700 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); }
1701 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); }
1702
1703 java_lang_invoke_MethodHandle::init_vmslots(mh());
1704 int vmargslot = m->size_of_parameters() - 1;
1705 assert(java_lang_invoke_BoundMethodHandle::vmargslot(mh()) == vmargslot, "");
1706
1707 if (VerifyMethodHandles) {
1708 verify_BoundMethodHandle_with_receiver(mh, m, CHECK);
1709 }
1710
1711 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m());
1712
1713 DEBUG_ONLY(KlassHandle junk1; int junk2);
1714 assert(MethodHandles::decode_method(mh(), junk1, junk2) == m, "properly stored for later decoding");
1715 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot");
1716
1717 // Done!
1718 java_lang_invoke_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh));
1719 }
1720
1721 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
1722 bool direct_to_method, TRAPS) {
1723 ResourceMark rm;
1724 Handle ptype_handle(THREAD,
1725 java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum));
1726 KlassHandle ptype_klass;
1727 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass);
1728 int slots_pushed = type2size[ptype];
1729
1730 oop argument = java_lang_invoke_BoundMethodHandle::argument(mh());
1731
1732 const char* err = NULL;
1733
1734 switch (ptype) {
1735 case T_OBJECT:
1736 if (argument != NULL)
1737 // we must implicitly convert from the arg type to the outgoing ptype
1738 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum);
1739 break;
1740
1741 case T_ARRAY: case T_VOID:
1742 assert(false, "array, void do not appear here");
1743 default:
1744 if (ptype != T_INT && !is_subword_type(ptype)) {
1745 err = "unexpected parameter type";
1746 break;
1747 }
1748 // check subrange of Integer.value, if necessary
1749 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) {
1750 err = "bound integer argument must be of type java.lang.Integer";
1751 break;
1752 }
1753 if (ptype != T_INT) {
1754 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
1755 jint value = argument->int_field(value_offset);
1756 int vminfo = adapter_unbox_subword_vminfo(ptype);
1757 jint subword = truncate_subword_from_vminfo(value, vminfo);
1758 if (value != subword) {
1759 err = "bound subword value does not fit into the subword type";
1760 break;
1761 }
1762 }
1763 break;
1764 case T_FLOAT:
1765 case T_DOUBLE:
1766 case T_LONG:
1767 {
1768 // we must implicitly convert from the unboxed arg type to the outgoing ptype
1769 BasicType argbox = java_lang_boxing_object::basic_type(argument);
1770 if (argbox != ptype) {
1771 err = check_argument_type_change(T_OBJECT, (argument == NULL
1772 ? SystemDictionary::Object_klass()
1773 : argument->klass()),
1774 ptype, ptype_klass(), argnum);
1775 assert(err != NULL, "this must be an error");
1776 }
1777 break;
1778 }
1779 }
1780
1781 if (err == NULL) {
1782 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1783 if (direct_to_method) {
1784 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots");
1785 } else {
1786 int target_pushes = decode_MethodHandle_stack_pushes(target());
1787 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct");
1788 }
1789 }
1790
1791 if (err == NULL) {
1792 // Verify the rest of the method type.
1793 err = check_method_type_insertion(java_lang_invoke_MethodHandle::type(mh()),
1794 argnum, ptype_handle(),
1795 java_lang_invoke_MethodHandle::type(target()));
1796 }
1797
1798 if (err != NULL) {
1799 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1800 }
1801 }
1802
1803 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
1804 // Check arguments.
1805 if (mh.is_null() || target.is_null() || !java_lang_invoke_MethodHandle::is_instance(target())) {
1806 THROW(vmSymbols::java_lang_InternalError());
1807 }
1808
1809 java_lang_invoke_MethodHandle::init_vmslots(mh());
1810 int argslot = java_lang_invoke_BoundMethodHandle::vmargslot(mh());
1811
1812 if (VerifyMethodHandles) {
1813 int insert_after = argnum - 1;
1814 verify_vmargslot(mh, insert_after, argslot, CHECK);
1815 verify_vmslots(mh, CHECK);
1816 }
1817
1818 // Get bound type and required slots.
1819 BasicType ptype;
1820 {
1821 oop ptype_oop = java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum);
1822 ptype = java_lang_Class::as_BasicType(ptype_oop);
1823 }
1824 int slots_pushed = type2size[ptype];
1825
1826 // If (a) the target is a direct non-dispatched method handle,
1827 // or (b) the target is a dispatched direct method handle and we
1828 // are binding the receiver, cut out the middle-man.
1829 // Do this by decoding the DMH and using its methodOop directly as vmtarget.
1830 bool direct_to_method = false;
1831 if (OptimizeMethodHandles &&
1832 target->klass() == SystemDictionary::DirectMethodHandle_klass() &&
1833 (argnum != 0 || java_lang_invoke_BoundMethodHandle::argument(mh()) != NULL) &&
1834 (argnum == 0 || java_lang_invoke_DirectMethodHandle::vmindex(target()) < 0)) {
1835 KlassHandle receiver_limit; int decode_flags = 0;
1836 methodHandle m = decode_method(target(), receiver_limit, decode_flags);
1837 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); }
1838 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg.
1839 assert(java_lang_invoke_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig");
1840 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) {
1841 init_BoundMethodHandle_with_receiver(mh, m,
1842 receiver_limit, decode_flags,
1843 CHECK);
1844 return;
1845 }
1846
1847 // Even if it is not a bound receiver, we still might be able
1848 // to bind another argument and still invoke the methodOop directly.
1849 if (!(decode_flags & _dmf_does_dispatch)) {
1850 direct_to_method = true;
1851 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m());
1852 }
1853 }
1854 if (!direct_to_method)
1855 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), target());
1856
1857 if (VerifyMethodHandles) {
1858 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK);
1859 }
1860
1861 // Next question: Is this a ref, int, or long bound value?
1862 MethodHandleEntry* me = NULL;
1863 if (ptype == T_OBJECT) {
1864 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh);
1865 else me = MethodHandles::entry(_bound_ref_mh);
1866 } else if (slots_pushed == 2) {
1867 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh);
1868 else me = MethodHandles::entry(_bound_long_mh);
1869 } else if (slots_pushed == 1) {
1870 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh);
1871 else me = MethodHandles::entry(_bound_int_mh);
1872 } else {
1873 assert(false, "");
1874 }
1875
1876 // Done!
1877 java_lang_invoke_MethodHandle::set_vmentry(mh(), me);
1878 }
1879
1880 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) {
1881 char msg[200];
1882 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err);
1883 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg);
1884 }
1885
1886 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) {
1887 ResourceMark rm;
1888 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
1889 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
1890
1891 verify_vmargslot(mh, argnum, argslot, CHECK);
1892 verify_vmslots(mh, CHECK);
1893
1894 jint conv_op = adapter_conversion_op(conversion);
1895 if (!conv_op_valid(conv_op)) {
1896 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD);
1897 return;
1898 }
1899 EntryKind ek = adapter_entry_kind(conv_op);
1900
1901 int stack_move = adapter_conversion_stack_move(conversion);
1902 BasicType src = adapter_conversion_src_type(conversion);
1903 BasicType dest = adapter_conversion_dest_type(conversion);
1904 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
1905
1906 Handle argument(THREAD, java_lang_invoke_AdapterMethodHandle::argument(mh()));
1907 Handle target(THREAD, java_lang_invoke_AdapterMethodHandle::vmtarget(mh()));
1908 Handle src_mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1909 Handle dst_mtype(THREAD, java_lang_invoke_MethodHandle::type(target()));
1910 Handle arg_mtype;
1911
1912 const char* err = NULL;
1913
1914 if (err == NULL) {
1915 // Check that the correct argument is supplied, but only if it is required.
1916 switch (ek) {
1917 case _adapter_check_cast: // target type of cast
1918 case _adapter_ref_to_prim: // wrapper type from which to unbox
1919 case _adapter_spread_args: // array type to spread from
1920 if (!java_lang_Class::is_instance(argument())
1921 || java_lang_Class::is_primitive(argument()))
1922 { err = "adapter requires argument of type java.lang.Class"; break; }
1923 if (ek == _adapter_spread_args) {
1924 // Make sure it is a suitable collection type. (Array, for now.)
1925 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument()));
1926 if (!ak->oop_is_array())
1927 { err = "spread adapter requires argument representing an array class"; break; }
1928 BasicType et = arrayKlass::cast(ak->as_klassOop())->element_type();
1929 if (et != dest && stack_move <= 0)
1930 { err = "spread adapter requires array class argument of correct type"; break; }
1931 }
1932 break;
1933 case _adapter_prim_to_ref: // boxer MH to use
1934 case _adapter_collect_args: // method handle which collects the args
1935 case _adapter_fold_args: // method handle which collects the args
1936 if (!UseRicochetFrames) {
1937 { err = "box/collect/fold operators are not supported"; break; }
1938 }
1939 if (!java_lang_invoke_MethodHandle::is_instance(argument()))
1940 { err = "MethodHandle adapter argument required"; break; }
1941 arg_mtype = Handle(THREAD, java_lang_invoke_MethodHandle::type(argument()));
1942 break;
1943 default:
1944 if (argument.not_null())
1945 { err = "adapter has spurious argument"; break; }
1946 break;
1947 }
1948 }
1949
1950 if (err == NULL) {
1951 // Check that the src/dest types are supplied if needed.
1952 // Also check relevant parameter or return types.
1953 switch (ek) {
1954 case _adapter_check_cast:
1955 if (src != T_OBJECT || dest != T_OBJECT) {
1956 err = "adapter requires object src/dest conversion subfields";
1957 }
1958 break;
1959 case _adapter_prim_to_prim:
1960 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) {
1961 err = "adapter requires primitive src/dest conversion subfields"; break;
1962 }
1963 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) ||
1964 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) {
1965 err = "adapter cannot convert beween floating and fixed-point"; break;
1966 }
1967 break;
1968 case _adapter_ref_to_prim:
1969 if (src != T_OBJECT || !is_java_primitive(dest)
1970 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) {
1971 err = "adapter requires primitive dest conversion subfield"; break;
1972 }
1973 break;
1974 case _adapter_prim_to_ref:
1975 if (!is_java_primitive(src) || dest != T_OBJECT) {
1976 err = "adapter requires primitive src conversion subfield"; break;
1977 }
1978 break;
1979 case _adapter_swap_args:
1980 {
1981 if (!src || !dest) {
1982 err = "adapter requires src/dest conversion subfields for swap"; break;
1983 }
1984 int src_size = type2size[src];
1985 if (src_size != type2size[dest]) {
1986 err = "adapter requires equal sizes for src/dest"; break;
1987 }
1988 int src_slot = argslot;
1989 int dest_slot = vminfo;
1990 int src_arg = argnum;
1991 int dest_arg = argument_slot_to_argnum(src_mtype(), dest_slot);
1992 verify_vmargslot(mh, dest_arg, dest_slot, CHECK);
1993 if (!(dest_slot >= src_slot + src_size) &&
1994 !(src_slot >= dest_slot + src_size)) {
1995 err = "source, destination slots must be distinct"; break;
1996 } else if (!(src_slot > dest_slot)) {
1997 err = "source of swap must be deeper in stack"; break;
1998 }
1999 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), dest_arg),
2000 java_lang_invoke_MethodType::ptype(dst_mtype(), src_arg),
2001 dest_arg);
2002 if (err == NULL)
2003 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), src_arg),
2004 java_lang_invoke_MethodType::ptype(dst_mtype(), dest_arg),
2005 src_arg);
2006 break;
2007 }
2008 case _adapter_rot_args:
2009 {
2010 if (!src || !dest) {
2011 err = "adapter requires src/dest conversion subfields for rotate"; break;
2012 }
2013 int src_slot = argslot;
2014 int limit_raw = vminfo;
2015 bool rot_down = (src_slot < limit_raw);
2016 int limit_bias = (rot_down ? MethodHandles::OP_ROT_ARGS_DOWN_LIMIT_BIAS : 0);
2017 int limit_slot = limit_raw - limit_bias;
2018 int src_arg = argnum;
2019 int limit_arg = argument_slot_to_argnum(src_mtype(), limit_slot);
2020 verify_vmargslot(mh, limit_arg, limit_slot, CHECK);
2021 if (src_slot == limit_slot) {
2022 err = "source, destination slots must be distinct"; break;
2023 }
2024 if (!rot_down) { // rotate slots up == shift arguments left
2025 // limit_slot is an inclusive lower limit
2026 assert((src_slot > limit_slot) && (src_arg < limit_arg), "");
2027 // rotate up: [limit_slot..src_slot-ss] --> [limit_slot+ss..src_slot]
2028 // that is: [src_arg+1..limit_arg] --> [src_arg..limit_arg-1]
2029 for (int i = src_arg+1; i <= limit_arg && err == NULL; i++) {
2030 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), i),
2031 java_lang_invoke_MethodType::ptype(dst_mtype(), i-1),
2032 i);
2033 }
2034 } else { // rotate slots down == shfit arguments right
2035 // limit_slot is an exclusive upper limit
2036 assert((src_slot < limit_slot - limit_bias) && (src_arg > limit_arg + limit_bias), "");
2037 // rotate down: [src_slot+ss..limit_slot) --> [src_slot..limit_slot-ss)
2038 // that is: (limit_arg..src_arg-1] --> (dst_arg+1..src_arg]
2039 for (int i = limit_arg+1; i <= src_arg-1 && err == NULL; i++) {
2040 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), i),
2041 java_lang_invoke_MethodType::ptype(dst_mtype(), i+1),
2042 i);
2043 }
2044 }
2045 if (err == NULL) {
2046 int dest_arg = (rot_down ? limit_arg+1 : limit_arg);
2047 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), src_arg),
2048 java_lang_invoke_MethodType::ptype(dst_mtype(), dest_arg),
2049 src_arg);
2050 }
2051 }
2052 break;
2053 case _adapter_spread_args:
2054 case _adapter_collect_args:
2055 case _adapter_fold_args:
2056 {
2057 bool is_spread = (ek == _adapter_spread_args);
2058 bool is_fold = (ek == _adapter_fold_args);
2059 BasicType coll_type = is_spread ? src : dest;
2060 BasicType elem_type = is_spread ? dest : src;
2061 // coll_type is type of args in collected form (or T_VOID if none)
2062 // elem_type is common type of args in spread form (or T_VOID if missing or heterogeneous)
2063 if (coll_type == 0 || elem_type == 0) {
2064 err = "adapter requires src/dest subfields for spread or collect"; break;
2065 }
2066 if (is_spread && coll_type != T_OBJECT) {
2067 err = "spread adapter requires object type for argument bundle"; break;
2068 }
2069 Handle spread_mtype = (is_spread ? dst_mtype : src_mtype);
2070 int spread_slot = argslot;
2071 int spread_arg = argnum;
2072 int slots_pushed = stack_move / stack_move_unit();
2073 int coll_slot_count = type2size[coll_type];
2074 int spread_slot_count = (is_spread ? slots_pushed : -slots_pushed) + coll_slot_count;
2075 if (is_fold) spread_slot_count = argument_slot_count(arg_mtype());
2076 if (!is_spread) {
2077 int init_slots = argument_slot_count(src_mtype());
2078 int coll_slots = argument_slot_count(arg_mtype());
2079 if (spread_slot_count > init_slots ||
2080 spread_slot_count != coll_slots) {
2081 err = "collect adapter has inconsistent arg counts"; break;
2082 }
2083 int next_slots = argument_slot_count(dst_mtype());
2084 int unchanged_slots_in = (init_slots - spread_slot_count);
2085 int unchanged_slots_out = (next_slots - coll_slot_count - (is_fold ? spread_slot_count : 0));
2086 if (unchanged_slots_in != unchanged_slots_out) {
2087 err = "collect adapter continuation has inconsistent arg counts"; break;
2088 }
2089 }
2090 }
2091 break;
2092 default:
2093 if (src != 0 || dest != 0) {
2094 err = "adapter has spurious src/dest conversion subfields"; break;
2095 }
2096 break;
2097 }
2098 }
2099
2100 if (err == NULL) {
2101 // Check the stack_move subfield.
2102 // It must always report the net change in stack size, positive or negative.
2103 int slots_pushed = stack_move / stack_move_unit();
2104 switch (ek) {
2105 case _adapter_prim_to_prim:
2106 case _adapter_ref_to_prim:
2107 case _adapter_prim_to_ref:
2108 if (slots_pushed != type2size[dest] - type2size[src]) {
2109 err = "wrong stack motion for primitive conversion";
2110 }
2111 break;
2112 case _adapter_dup_args:
2113 if (slots_pushed <= 0) {
2114 err = "adapter requires conversion subfield slots_pushed > 0";
2115 }
2116 break;
2117 case _adapter_drop_args:
2118 if (slots_pushed >= 0) {
2119 err = "adapter requires conversion subfield slots_pushed < 0";
2120 }
2121 break;
2122 case _adapter_collect_args:
2123 case _adapter_fold_args:
2124 if (slots_pushed > 2) {
2125 err = "adapter requires conversion subfield slots_pushed <= 2";
2126 }
2127 break;
2128 case _adapter_spread_args:
2129 if (slots_pushed < -1) {
2130 err = "adapter requires conversion subfield slots_pushed >= -1";
2131 }
2132 break;
2133 default:
2134 if (stack_move != 0) {
2135 err = "adapter has spurious stack_move conversion subfield";
2136 }
2137 break;
2138 }
2139 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) {
2140 err = "stack_move conversion subfield must be multiple of stack_move_unit";
2141 }
2142 }
2143
2144 if (err == NULL) {
2145 // Make sure this adapter's stack pushing is accurately recorded.
2146 int slots_pushed = stack_move / stack_move_unit();
2147 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh());
2148 int target_vmslots = java_lang_invoke_MethodHandle::vmslots(target());
2149 int target_pushes = decode_MethodHandle_stack_pushes(target());
2150 if (slots_pushed != (target_vmslots - this_vmslots)) {
2151 err = "stack_move inconsistent with previous and current MethodType vmslots";
2152 } else {
2153 int this_pushes = decode_MethodHandle_stack_pushes(mh());
2154 if (slots_pushed + target_pushes != this_pushes) {
2155 if (this_pushes == 0)
2156 err = "adapter push count not initialized";
2157 else
2158 err = "adapter push count is wrong";
2159 }
2160 }
2161
2162 // While we're at it, check that the stack motion decoder works:
2163 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
2164 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct");
2165 }
2166
2167 if (err == NULL && vminfo != 0) {
2168 switch (ek) {
2169 case _adapter_swap_args:
2170 case _adapter_rot_args:
2171 case _adapter_prim_to_ref:
2172 case _adapter_collect_args:
2173 case _adapter_fold_args:
2174 break; // OK
2175 default:
2176 err = "vminfo subfield is reserved to the JVM";
2177 }
2178 }
2179
2180 // Do additional ad hoc checks.
2181 if (err == NULL) {
2182 switch (ek) {
2183 case _adapter_retype_only:
2184 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false);
2185 break;
2186
2187 case _adapter_retype_raw:
2188 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true);
2189 break;
2190
2191 case _adapter_check_cast:
2192 {
2193 // The actual value being checked must be a reference:
2194 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), argnum),
2195 object_java_mirror(), argnum);
2196 if (err != NULL) break;
2197
2198 // The output of the cast must fit with the destination argument:
2199 Handle cast_class = argument;
2200 err = check_method_type_conversion(src_mtype(),
2201 argnum, cast_class(),
2202 dst_mtype());
2203 }
2204 break;
2205
2206 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles
2207 }
2208 }
2209
2210 if (err != NULL) {
2211 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
2212 return;
2213 }
2214
2215 }
2216
2217 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
2218 Handle argument = java_lang_invoke_AdapterMethodHandle::argument(mh());
2219 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
2220 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
2221 jint conv_op = adapter_conversion_op(conversion);
2222
2223 // adjust the adapter code to the internal EntryKind enumeration:
2224 EntryKind ek_orig = adapter_entry_kind(conv_op);
2225 EntryKind ek_opt = ek_orig; // may be optimized
2226 EntryKind ek_try; // temp
2227
2228 // Finalize the vmtarget field (Java initialized it to null).
2229 if (!java_lang_invoke_MethodHandle::is_instance(target())) {
2230 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD);
2231 return;
2232 }
2233 java_lang_invoke_AdapterMethodHandle::set_vmtarget(mh(), target());
2234
2235 int stack_move = adapter_conversion_stack_move(conversion);
2236 BasicType src = adapter_conversion_src_type(conversion);
2237 BasicType dest = adapter_conversion_dest_type(conversion);
2238 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
2239
2240 int slots_pushed = stack_move / stack_move_unit();
2241
2242 if (VerifyMethodHandles) {
2243 verify_AdapterMethodHandle(mh, argnum, CHECK);
2244 }
2245
2246 const char* err = NULL;
2247
2248 if (!conv_op_supported(conv_op)) {
2249 err = "adapter not yet implemented in the JVM";
2250 }
2251
2252 // Now it's time to finish the case analysis and pick a MethodHandleEntry.
2253 switch (ek_orig) {
2254 case _adapter_retype_only:
2255 case _adapter_retype_raw:
2256 case _adapter_check_cast:
2257 case _adapter_dup_args:
2258 case _adapter_drop_args:
2259 // these work fine via general case code
2260 break;
2261
2262 case _adapter_prim_to_prim:
2263 {
2264 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}.
2265 // And, the {float,double} -> {int,long} cases must be handled by Java.
2266 switch (type2size[src] *4+ type2size[dest]) {
2267 case 1 *4+ 1:
2268 assert(src == T_INT || is_subword_type(src), "source is not float");
2269 // Subword-related cases are int -> {boolean,byte,char,short}.
2270 ek_opt = _adapter_opt_i2i;
2271 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2272 break;
2273 case 2 *4+ 1:
2274 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) {
2275 ek_opt = _adapter_opt_l2i;
2276 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2277 } else if (src == T_DOUBLE && dest == T_FLOAT) {
2278 ek_opt = _adapter_opt_d2f;
2279 } else {
2280 goto throw_not_impl; // runs user code, hence could block
2281 }
2282 break;
2283 case 1 *4+ 2:
2284 if ((src == T_INT || is_subword_type(src)) && dest == T_LONG) {
2285 ek_opt = _adapter_opt_i2l;
2286 } else if (src == T_FLOAT && dest == T_DOUBLE) {
2287 ek_opt = _adapter_opt_f2d;
2288 } else {
2289 goto throw_not_impl; // runs user code, hence could block
2290 }
2291 break;
2292 default:
2293 goto throw_not_impl; // runs user code, hence could block
2294 break;
2295 }
2296 }
2297 break;
2298
2299 case _adapter_ref_to_prim:
2300 {
2301 switch (type2size[dest]) {
2302 case 1:
2303 ek_opt = _adapter_opt_unboxi;
2304 vminfo = adapter_unbox_subword_vminfo(dest);
2305 break;
2306 case 2:
2307 ek_opt = _adapter_opt_unboxl;
2308 break;
2309 default:
2310 goto throw_not_impl;
2311 break;
2312 }
2313 }
2314 break;
2315
2316 case _adapter_prim_to_ref:
2317 {
2318 assert(UseRicochetFrames, "else don't come here");
2319 // vminfo will be the location to insert the return value
2320 vminfo = argslot;
2321 ek_opt = _adapter_opt_collect_ref;
2322 ensure_vmlayout_field(target, CHECK);
2323 // for MethodHandleWalk:
2324 if (java_lang_invoke_AdapterMethodHandle::is_instance(argument()))
2325 ensure_vmlayout_field(argument, CHECK);
2326 if (!OptimizeMethodHandles) break;
2327 switch (type2size[src]) {
2328 case 1:
2329 ek_try = EntryKind(_adapter_opt_filter_S0_ref + argslot);
2330 if (ek_try < _adapter_opt_collect_LAST &&
2331 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2332 assert(ek_adapter_opt_collect_count(ek_try) == 1 &&
2333 ek_adapter_opt_collect_type(ek_try) == T_OBJECT, "");
2334 ek_opt = ek_try;
2335 break;
2336 }
2337 // else downgrade to variable slot:
2338 ek_opt = _adapter_opt_collect_1_ref;
2339 break;
2340 case 2:
2341 ek_try = EntryKind(_adapter_opt_collect_2_S0_ref + argslot);
2342 if (ek_try < _adapter_opt_collect_LAST &&
2343 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2344 assert(ek_adapter_opt_collect_count(ek_try) == 2 &&
2345 ek_adapter_opt_collect_type(ek_try) == T_OBJECT, "");
2346 ek_opt = ek_try;
2347 break;
2348 }
2349 // else downgrade to variable slot:
2350 ek_opt = _adapter_opt_collect_2_ref;
2351 break;
2352 default:
2353 goto throw_not_impl;
2354 break;
2355 }
2356 }
2357 break;
2358
2359 case _adapter_swap_args:
2360 case _adapter_rot_args:
2361 {
2362 int swap_slots = type2size[src];
2363 int src_slot = argslot;
2364 int dest_slot = vminfo;
2365 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1;
2366 switch (swap_slots) {
2367 case 1:
2368 ek_opt = (!rotate ? _adapter_opt_swap_1 :
2369 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down);
2370 break;
2371 case 2:
2372 ek_opt = (!rotate ? _adapter_opt_swap_2 :
2373 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down);
2374 break;
2375 default:
2376 goto throw_not_impl;
2377 break;
2378 }
2379 }
2380 break;
2381
2382 case _adapter_spread_args:
2383 {
2384 #ifdef TARGET_ARCH_NYI_6939861
2385 // ports before 6939861 supported only three kinds of spread ops
2386 if (!UseRicochetFrames) {
2387 int array_size = slots_pushed + 1;
2388 assert(array_size >= 0, "");
2389 vminfo = array_size;
2390 switch (array_size) {
2391 case 0: ek_opt = _adapter_opt_spread_0; break;
2392 case 1: ek_opt = _adapter_opt_spread_1; break;
2393 default: ek_opt = _adapter_opt_spread_more; break;
2394 }
2395 break;
2396 }
2397 #endif //TARGET_ARCH_NYI_6939861
2398 // vminfo will be the required length of the array
2399 int array_size = (slots_pushed + 1) / (type2size[dest] == 2 ? 2 : 1);
2400 vminfo = array_size;
2401 // general case
2402 switch (dest) {
2403 case T_BOOLEAN : // fall through to T_BYTE:
2404 case T_BYTE : ek_opt = _adapter_opt_spread_byte; break;
2405 case T_CHAR : ek_opt = _adapter_opt_spread_char; break;
2406 case T_SHORT : ek_opt = _adapter_opt_spread_short; break;
2407 case T_INT : ek_opt = _adapter_opt_spread_int; break;
2408 case T_LONG : ek_opt = _adapter_opt_spread_long; break;
2409 case T_FLOAT : ek_opt = _adapter_opt_spread_float; break;
2410 case T_DOUBLE : ek_opt = _adapter_opt_spread_double; break;
2411 case T_OBJECT : ek_opt = _adapter_opt_spread_ref; break;
2412 case T_VOID : if (array_size != 0) goto throw_not_impl;
2413 ek_opt = _adapter_opt_spread_ref; break;
2414 default : goto throw_not_impl;
2415 }
2416 assert(array_size == 0 || // it doesn't matter what the spreader is
2417 (ek_adapter_opt_spread_count(ek_opt) == -1 &&
2418 (ek_adapter_opt_spread_type(ek_opt) == dest ||
2419 (ek_adapter_opt_spread_type(ek_opt) == T_BYTE && dest == T_BOOLEAN))),
2420 err_msg("dest=%d ek_opt=%d", dest, ek_opt));
2421
2422 if (array_size <= 0) {
2423 // since the general case does not handle length 0, this case is required:
2424 ek_opt = _adapter_opt_spread_0;
2425 break;
2426 }
2427 if (dest == T_OBJECT) {
2428 ek_try = EntryKind(_adapter_opt_spread_1_ref - 1 + array_size);
2429 if (ek_try < _adapter_opt_spread_LAST &&
2430 ek_adapter_opt_spread_count(ek_try) == array_size) {
2431 assert(ek_adapter_opt_spread_type(ek_try) == dest, "");
2432 ek_opt = ek_try;
2433 break;
2434 }
2435 }
2436 break;
2437 }
2438 break;
2439
2440 case _adapter_collect_args:
2441 {
2442 assert(UseRicochetFrames, "else don't come here");
2443 int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument()));
2444 // vminfo will be the location to insert the return value
2445 vminfo = argslot;
2446 ensure_vmlayout_field(target, CHECK);
2447 ensure_vmlayout_field(argument, CHECK);
2448
2449 // general case:
2450 switch (dest) {
2451 default : if (!is_subword_type(dest)) goto throw_not_impl;
2452 // else fall through:
2453 case T_INT : ek_opt = _adapter_opt_collect_int; break;
2454 case T_LONG : ek_opt = _adapter_opt_collect_long; break;
2455 case T_FLOAT : ek_opt = _adapter_opt_collect_float; break;
2456 case T_DOUBLE : ek_opt = _adapter_opt_collect_double; break;
2457 case T_OBJECT : ek_opt = _adapter_opt_collect_ref; break;
2458 case T_VOID : ek_opt = _adapter_opt_collect_void; break;
2459 }
2460 assert(ek_adapter_opt_collect_slot(ek_opt) == -1 &&
2461 ek_adapter_opt_collect_count(ek_opt) == -1 &&
2462 (ek_adapter_opt_collect_type(ek_opt) == dest ||
2463 ek_adapter_opt_collect_type(ek_opt) == T_INT && is_subword_type(dest)),
2464 "");
2465
2466 if (dest == T_OBJECT && elem_slots == 1 && OptimizeMethodHandles) {
2467 // filter operation on a ref
2468 ek_try = EntryKind(_adapter_opt_filter_S0_ref + argslot);
2469 if (ek_try < _adapter_opt_collect_LAST &&
2470 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2471 assert(ek_adapter_opt_collect_count(ek_try) == elem_slots &&
2472 ek_adapter_opt_collect_type(ek_try) == dest, "");
2473 ek_opt = ek_try;
2474 break;
2475 }
2476 ek_opt = _adapter_opt_collect_1_ref;
2477 break;
2478 }
2479
2480 if (dest == T_OBJECT && elem_slots == 2 && OptimizeMethodHandles) {
2481 // filter of two arguments
2482 ek_try = EntryKind(_adapter_opt_collect_2_S0_ref + argslot);
2483 if (ek_try < _adapter_opt_collect_LAST &&
2484 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2485 assert(ek_adapter_opt_collect_count(ek_try) == elem_slots &&
2486 ek_adapter_opt_collect_type(ek_try) == dest, "");
2487 ek_opt = ek_try;
2488 break;
2489 }
2490 ek_opt = _adapter_opt_collect_2_ref;
2491 break;
2492 }
2493
2494 if (dest == T_OBJECT && OptimizeMethodHandles) {
2495 // try to use a fixed length adapter
2496 ek_try = EntryKind(_adapter_opt_collect_0_ref + elem_slots);
2497 if (ek_try < _adapter_opt_collect_LAST &&
2498 ek_adapter_opt_collect_count(ek_try) == elem_slots) {
2499 assert(ek_adapter_opt_collect_slot(ek_try) == -1 &&
2500 ek_adapter_opt_collect_type(ek_try) == dest, "");
2501 ek_opt = ek_try;
2502 break;
2503 }
2504 }
2505
2506 break;
2507 }
2508
2509 case _adapter_fold_args:
2510 {
2511 assert(UseRicochetFrames, "else don't come here");
2512 int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument()));
2513 // vminfo will be the location to insert the return value
2514 vminfo = argslot + elem_slots;
2515 ensure_vmlayout_field(target, CHECK);
2516 ensure_vmlayout_field(argument, CHECK);
2517
2518 switch (dest) {
2519 default : if (!is_subword_type(dest)) goto throw_not_impl;
2520 // else fall through:
2521 case T_INT : ek_opt = _adapter_opt_fold_int; break;
2522 case T_LONG : ek_opt = _adapter_opt_fold_long; break;
2523 case T_FLOAT : ek_opt = _adapter_opt_fold_float; break;
2524 case T_DOUBLE : ek_opt = _adapter_opt_fold_double; break;
2525 case T_OBJECT : ek_opt = _adapter_opt_fold_ref; break;
2526 case T_VOID : ek_opt = _adapter_opt_fold_void; break;
2527 }
2528 assert(ek_adapter_opt_collect_slot(ek_opt) == -1 &&
2529 ek_adapter_opt_collect_count(ek_opt) == -1 &&
2530 (ek_adapter_opt_collect_type(ek_opt) == dest ||
2531 ek_adapter_opt_collect_type(ek_opt) == T_INT && is_subword_type(dest)),
2532 "");
2533
2534 if (dest == T_OBJECT && elem_slots == 0 && OptimizeMethodHandles) {
2535 // if there are no args, just pretend it's a collect
2536 ek_opt = _adapter_opt_collect_0_ref;
2537 break;
2538 }
2539
2540 if (dest == T_OBJECT && OptimizeMethodHandles) {
2541 // try to use a fixed length adapter
2542 ek_try = EntryKind(_adapter_opt_fold_1_ref - 1 + elem_slots);
2543 if (ek_try < _adapter_opt_fold_LAST &&
2544 ek_adapter_opt_collect_count(ek_try) == elem_slots) {
2545 assert(ek_adapter_opt_collect_slot(ek_try) == -1 &&
2546 ek_adapter_opt_collect_type(ek_try) == dest, "");
2547 ek_opt = ek_try;
2548 break;
2549 }
2550 }
2551
2552 break;
2553 }
2554
2555 default:
2556 // should have failed much earlier; must be a missing case here
2557 assert(false, "incomplete switch");
2558 // and fall through:
2559
2560 throw_not_impl:
2561 if (err == NULL)
2562 err = "unknown adapter type";
2563 break;
2564 }
2565
2566 if (err == NULL && (vminfo & CONV_VMINFO_MASK) != vminfo) {
2567 // should not happen, since vminfo is used to encode arg/slot indexes < 255
2568 err = "vminfo overflow";
2569 }
2570
2571 if (err == NULL && !have_entry(ek_opt)) {
2572 err = "adapter stub for this kind of method handle is missing";
2573 }
2574
2575 if (err == NULL && ek_opt == ek_orig) {
2576 switch (ek_opt) {
2577 case _adapter_prim_to_prim:
2578 case _adapter_ref_to_prim:
2579 case _adapter_prim_to_ref:
2580 case _adapter_swap_args:
2581 case _adapter_rot_args:
2582 case _adapter_collect_args:
2583 case _adapter_fold_args:
2584 case _adapter_spread_args:
2585 // should be handled completely by optimized cases; see above
2586 err = "init_AdapterMethodHandle should not issue this";
2587 break;
2588 }
2589 }
2590
2591 if (err != NULL) {
2592 throw_InternalError_for_bad_conversion(conversion, err_msg("%s: conv_op %d ek_opt %d", err, conv_op, ek_opt), THREAD);
2593 return;
2594 }
2595
2596 // Rebuild the conversion value; maybe parts of it were changed.
2597 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo);
2598
2599 // Finalize the conversion field. (Note that it is final to Java code.)
2600 java_lang_invoke_AdapterMethodHandle::set_conversion(mh(), new_conversion);
2601
2602 // Done!
2603 java_lang_invoke_MethodHandle::set_vmentry(mh(), entry(ek_opt));
2604
2605 // There should be enough memory barriers on exit from native methods
2606 // to ensure that the MH is fully initialized to all threads before
2607 // Java code can publish it in global data structures.
2608 }
2609
2610 void MethodHandles::ensure_vmlayout_field(Handle target, TRAPS) {
2611 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(target()));
2612 Handle mtform(THREAD, java_lang_invoke_MethodType::form(mtype()));
2613 if (mtform.is_null()) { THROW(vmSymbols::java_lang_InternalError()); }
2614 if (java_lang_invoke_MethodTypeForm::vmlayout_offset_in_bytes() > 0) {
2615 if (java_lang_invoke_MethodTypeForm::vmlayout(mtform()) == NULL) {
2616 // fill it in
2617 Handle erased_mtype(THREAD, java_lang_invoke_MethodTypeForm::erasedType(mtform()));
2618 TempNewSymbol erased_signature
2619 = java_lang_invoke_MethodType::as_signature(erased_mtype(), /*intern:*/true, CHECK);
2620 methodOop cookie
2621 = SystemDictionary::find_method_handle_invoke(vmSymbols::invokeExact_name(),
2622 erased_signature,
2623 SystemDictionaryHandles::Object_klass(),
2624 THREAD);
2625 java_lang_invoke_MethodTypeForm::init_vmlayout(mtform(), cookie);
2626 }
2627 }
2628 }
2629
2630 #ifdef ASSERT
2631
2632 extern "C"
2633 void print_method_handle(oop mh);
2634
2635 static void stress_method_handle_walk_impl(Handle mh, TRAPS) {
2636 if (StressMethodHandleWalk) {
2637 // Exercise the MethodHandleWalk code in various ways and validate
2638 // the resulting method oop. Some of these produce output so they
2639 // are guarded under Verbose.
2640 ResourceMark rm;
2641 HandleMark hm;
2642 if (Verbose) {
2643 print_method_handle(mh());
2644 }
2645 TempNewSymbol name = SymbolTable::new_symbol("invoke", CHECK);
2646 Handle mt = java_lang_invoke_MethodHandle::type(mh());
2647 TempNewSymbol signature = java_lang_invoke_MethodType::as_signature(mt(), true, CHECK);
2648 MethodHandleCompiler mhc(mh, name, signature, 10000, false, CHECK);
2649 methodHandle m = mhc.compile(CHECK);
2650 if (Verbose) {
2651 m->print_codes();
2652 }
2653 InterpreterOopMap mask;
2654 OopMapCache::compute_one_oop_map(m, m->code_size() - 1, &mask);
2655 }
2656 }
2657
2658 static void stress_method_handle_walk(Handle mh, TRAPS) {
2659 stress_method_handle_walk_impl(mh, THREAD);
2660 if (HAS_PENDING_EXCEPTION) {
2661 oop ex = PENDING_EXCEPTION;
2662 CLEAR_PENDING_EXCEPTION;
2663 tty->print("StressMethodHandleWalk: ");
2664 java_lang_Throwable::print(ex, tty);
2665 tty->cr();
2666 }
2667 }
2668 #else
2669
2670 static void stress_method_handle_walk(Handle mh, TRAPS) {}
2671
2672 #endif
2673
2674 //
2675 // Here are the native methods on sun.invoke.MethodHandleImpl.
2676 // They are the private interface between this JVM and the HotSpot-specific
2677 // Java code that implements JSR 292 method handles.
2678 //
2679 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
2680 // that intrinsic (non-JNI) native methods are defined in HotSpot.
2681 //
2682
2683 // direct method handles for invokestatic or invokespecial
2684 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller);
2685 JVM_ENTRY(void, MHN_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2686 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) {
2687 ResourceMark rm; // for error messages
2688
2689 // This is the guy we are initializing:
2690 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2691 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2692
2693 // Early returns out of this method leave the DMH in an unfinished state.
2694 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2695
2696 // which method are we really talking about?
2697 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2698 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2699 if (java_lang_invoke_MemberName::is_instance(target()) &&
2700 java_lang_invoke_MemberName::vmindex(target()) == VM_INDEX_UNINITIALIZED) {
2701 MethodHandles::resolve_MemberName(target, CHECK);
2702 }
2703
2704 KlassHandle receiver_limit; int decode_flags = 0;
2705 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags);
2706 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); }
2707
2708 // The trusted Java code that calls this method should already have performed
2709 // access checks on behalf of the given caller. But, we can verify this.
2710 if (VerifyMethodHandles && caller_jh != NULL) {
2711 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)));
2712 // If this were a bytecode, the first access check would be against
2713 // the "reference class" mentioned in the CONSTANT_Methodref.
2714 // We don't know at this point which class that was, and if we
2715 // check against m.method_holder we might get the wrong answer.
2716 // So we just make sure to handle this check when the resolution
2717 // happens, when we call resolve_MemberName.
2718 //
2719 // (A public class can inherit public members from private supers,
2720 // and it would be wrong to check access against the private super
2721 // if the original symbolic reference was against the public class.)
2722 //
2723 // If there were a bytecode, the next step would be to lookup the method
2724 // in the reference class, then then check the method's access bits.
2725 // Emulate LinkResolver::check_method_accessability.
2726 klassOop resolved_klass = m->method_holder();
2727 if (!Reflection::verify_field_access(caller->as_klassOop(),
2728 resolved_klass, resolved_klass,
2729 m->access_flags(),
2730 true)) {
2731 // %%% following cutout belongs in Reflection::verify_field_access?
2732 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(),
2733 resolved_klass, THREAD);
2734 if (!same_pm) {
2735 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string());
2736 }
2737 }
2738 }
2739
2740 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK);
2741 stress_method_handle_walk(mh, CHECK);
2742 }
2743 JVM_END
2744
2745 // bound method handles
2746 JVM_ENTRY(void, MHN_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2747 jobject target_jh, int argnum)) {
2748 ResourceMark rm; // for error messages
2749
2750 // This is the guy we are initializing:
2751 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2752 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2753
2754 // Early returns out of this method leave the BMH in an unfinished state.
2755 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2756
2757 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2758 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2759
2760 if (!java_lang_invoke_MethodHandle::is_instance(target())) {
2761 // Target object is a reflective method. (%%% Do we need this alternate path?)
2762 Untested("init_BMH of non-MH");
2763 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); }
2764 KlassHandle receiver_limit; int decode_flags = 0;
2765 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags);
2766 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m,
2767 receiver_limit,
2768 decode_flags,
2769 CHECK);
2770 } else {
2771 // Build a BMH on top of a DMH or another BMH:
2772 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK);
2773 }
2774 stress_method_handle_walk(mh, CHECK);
2775 }
2776 JVM_END
2777
2778 // adapter method handles
2779 JVM_ENTRY(void, MHN_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2780 jobject target_jh, int argnum)) {
2781 // This is the guy we are initializing:
2782 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2783 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2784 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2785 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2786
2787 // Early returns out of this method leave the AMH in an unfinished state.
2788 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2789
2790 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK);
2791 stress_method_handle_walk(mh, CHECK);
2792 }
2793 JVM_END
2794
2795 // method type forms
2796 JVM_ENTRY(void, MHN_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) {
2797 if (erased_jh == NULL) return;
2798 if (TraceMethodHandles) {
2799 tty->print("creating MethodType form ");
2800 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH!
2801 // call Object.toString()
2802 Symbol* name = vmSymbols::toString_name();
2803 Symbol* sig = vmSymbols::void_string_signature();
2804 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh)));
2805 JavaValue result(T_OBJECT);
2806 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig,
2807 &args, CHECK);
2808 Handle str(THREAD, (oop)result.get_jobject());
2809 java_lang_String::print(str, tty);
2810 }
2811 tty->cr();
2812 }
2813 }
2814 JVM_END
2815
2816 // debugging and reflection
2817 JVM_ENTRY(jobject, MHN_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) {
2818 Handle mh(THREAD, JNIHandles::resolve(mh_jh));
2819 if (!java_lang_invoke_MethodHandle::is_instance(mh())) {
2820 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
2821 }
2822 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL);
2823 return JNIHandles::make_local(THREAD, target);
2824 }
2825 JVM_END
2826
2827 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
2828 switch (which) {
2829 case MethodHandles::GC_JVM_PUSH_LIMIT:
2830 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF,
2831 "MethodHandlePushLimit parameter must be in valid range");
2832 return MethodHandlePushLimit;
2833 case MethodHandles::GC_JVM_STACK_MOVE_UNIT:
2834 // return number of words per slot, signed according to stack direction
2835 return MethodHandles::stack_move_unit();
2836 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK:
2837 return MethodHandles::adapter_conversion_ops_supported_mask();
2838 case MethodHandles::GC_OP_ROT_ARGS_DOWN_LIMIT_BIAS:
2839 return MethodHandles::OP_ROT_ARGS_DOWN_LIMIT_BIAS;
2840 }
2841 return 0;
2842 }
2843 JVM_END
2844
2845 #ifndef PRODUCT
2846 #define EACH_NAMED_CON(template) \
2847 /* hold back this one until JDK stabilizes */ \
2848 /* template(MethodHandles,GC_JVM_PUSH_LIMIT) */ \
2849 /* hold back this one until JDK stabilizes */ \
2850 /* template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) */ \
2851 /* hold back this one until JDK stabilizes */ \
2852 /* template(MethodHandles,GC_OP_ROT_ARGS_DOWN_LIMIT_BIAS) */ \
2853 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \
2854 template(MethodHandles,ETF_DIRECT_HANDLE) \
2855 template(MethodHandles,ETF_METHOD_NAME) \
2856 template(MethodHandles,ETF_REFLECT_METHOD) \
2857 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
2858 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
2859 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
2860 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
2861 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
2862 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
2863 template(java_lang_invoke_MemberName,VM_INDEX_UNINITIALIZED) \
2864 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_ONLY) \
2865 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_RAW) \
2866 template(java_lang_invoke_AdapterMethodHandle,OP_CHECK_CAST) \
2867 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_PRIM) \
2868 template(java_lang_invoke_AdapterMethodHandle,OP_REF_TO_PRIM) \
2869 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_REF) \
2870 template(java_lang_invoke_AdapterMethodHandle,OP_SWAP_ARGS) \
2871 template(java_lang_invoke_AdapterMethodHandle,OP_ROT_ARGS) \
2872 template(java_lang_invoke_AdapterMethodHandle,OP_DUP_ARGS) \
2873 template(java_lang_invoke_AdapterMethodHandle,OP_DROP_ARGS) \
2874 template(java_lang_invoke_AdapterMethodHandle,OP_COLLECT_ARGS) \
2875 template(java_lang_invoke_AdapterMethodHandle,OP_SPREAD_ARGS) \
2876 /* hold back this one until JDK stabilizes */ \
2877 /*template(java_lang_invoke_AdapterMethodHandle,CONV_OP_LIMIT)*/ \
2878 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_MASK) \
2879 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_MASK) \
2880 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_SHIFT) \
2881 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_SHIFT) \
2882 template(java_lang_invoke_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \
2883 template(java_lang_invoke_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \
2884 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \
2885 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \
2886 /*end*/
2887
2888 #define ONE_PLUS(scope,value) 1+
2889 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0;
2890 #define VALUE_COMMA(scope,value) scope::value,
2891 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 };
2892 #define STRING_NULL(scope,value) #value "\0"
2893 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) };
2894
2895 #undef ONE_PLUS
2896 #undef VALUE_COMMA
2897 #undef STRING_NULL
2898 #undef EACH_NAMED_CON
2899 #endif
2900
2901 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
2902 #ifndef PRODUCT
2903 if (which >= 0 && which < con_value_count) {
2904 int con = con_values[which];
2905 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
2906 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
2907 const char* str = &con_names[0];
2908 for (int i = 0; i < which; i++)
2909 str += strlen(str) + 1; // skip name and null
2910 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
2911 box->obj_at_put(0, name);
2912 }
2913 return con;
2914 }
2915 #endif
2916 return 0;
2917 }
2918 JVM_END
2919
2920 // void init(MemberName self, AccessibleObject ref)
2921 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
2922 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
2923 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2924 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2925 oop target_oop = JNIHandles::resolve_non_null(target_jh);
2926 MethodHandles::init_MemberName(mname(), target_oop);
2927 }
2928 JVM_END
2929
2930 // void expand(MemberName self)
2931 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
2932 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
2933 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2934 MethodHandles::expand_MemberName(mname, 0, CHECK);
2935 }
2936 JVM_END
2937
2938 // void resolve(MemberName self, Class<?> caller)
2939 JVM_ENTRY(void, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
2940 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
2941 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2942
2943 // The trusted Java code that calls this method should already have performed
2944 // access checks on behalf of the given caller. But, we can verify this.
2945 if (VerifyMethodHandles && caller_jh != NULL) {
2946 klassOop reference_klass = java_lang_Class::as_klassOop(java_lang_invoke_MemberName::clazz(mname()));
2947 if (reference_klass != NULL) {
2948 // Emulate LinkResolver::check_klass_accessability.
2949 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh));
2950 if (!Reflection::verify_class_access(caller,
2951 reference_klass,
2952 true)) {
2953 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name());
2954 }
2955 }
2956 }
2957
2958 MethodHandles::resolve_MemberName(mname, CHECK);
2959 }
2960 JVM_END
2961
2962 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
2963 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
2964 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
2965 jclass clazz_jh, jstring name_jh, jstring sig_jh,
2966 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
2967 if (clazz_jh == NULL || results_jh == NULL) return -1;
2968 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)));
2969
2970 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
2971 if (results.is_null() || !results->is_objArray()) return -1;
2972
2973 TempNewSymbol name = NULL;
2974 TempNewSymbol sig = NULL;
2975 if (name_jh != NULL) {
2976 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
2977 if (name == NULL) return 0; // a match is not possible
2978 }
2979 if (sig_jh != NULL) {
2980 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
2981 if (sig == NULL) return 0; // a match is not possible
2982 }
2983
2984 KlassHandle caller;
2985 if (caller_jh != NULL) {
2986 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
2987 if (!java_lang_Class::is_instance(caller_oop)) return -1;
2988 caller = KlassHandle(THREAD, java_lang_Class::as_klassOop(caller_oop));
2989 }
2990
2991 if (name != NULL && sig != NULL && results.not_null()) {
2992 // try a direct resolve
2993 // %%% TO DO
2994 }
2995
2996 int res = MethodHandles::find_MemberNames(k(), name, sig, mflags,
2997 caller(), skip, results());
2998 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
2999 return res;
3000 }
3001 JVM_END
3002
3003 methodOop MethodHandles::resolve_raise_exception_method(TRAPS) {
3004 if (_raise_exception_method != NULL) {
3005 // no need to do it twice
3006 return raise_exception_method();
3007 }
3008 // LinkResolver::resolve_invokedynamic can reach this point
3009 // because an invokedynamic has failed very early (7049415)
3010 KlassHandle MHN_klass = SystemDictionaryHandles::MethodHandleNatives_klass();
3011 if (MHN_klass.not_null()) {
3012 TempNewSymbol raiseException_name = SymbolTable::new_symbol("raiseException", CHECK_NULL);
3013 TempNewSymbol raiseException_sig = SymbolTable::new_symbol("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK_NULL);
3014 methodOop raiseException_method = instanceKlass::cast(MHN_klass->as_klassOop())
3015 ->find_method(raiseException_name, raiseException_sig);
3016 if (raiseException_method != NULL && raiseException_method->is_static()) {
3017 return raiseException_method;
3018 }
3019 }
3020 // not found; let the caller deal with it
3021 return NULL;
3022 }
3023 void MethodHandles::raise_exception(int code, oop actual, oop required, TRAPS) {
3024 methodOop raiseException_method = resolve_raise_exception_method(CHECK);
3025 if (raiseException_method != NULL &&
3026 instanceKlass::cast(raiseException_method->method_holder())->is_not_initialized()) {
3027 instanceKlass::cast(raiseException_method->method_holder())->initialize(CHECK);
3028 // it had better be resolved by now, or maybe JSR 292 failed to load
3029 raiseException_method = raise_exception_method();
3030 }
3031 if (raiseException_method == NULL) {
3032 THROW_MSG(vmSymbols::java_lang_InternalError(), "no raiseException method");
3033 }
3034 JavaCallArguments args;
3035 args.push_int(code);
3036 args.push_oop(actual);
3037 args.push_oop(required);
3038 JavaValue result(T_VOID);
3039 JavaCalls::call(&result, raiseException_method, &args, CHECK);
3040 }
3041
3042 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) {
3043 TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL);
3044 THROW_MSG_NULL(UOE_name, "MethodHandle.invoke cannot be invoked reflectively");
3045 return NULL;
3046 }
3047 JVM_END
3048
3049 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) {
3050 TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL);
3051 THROW_MSG_NULL(UOE_name, "MethodHandle.invokeExact cannot be invoked reflectively");
3052 return NULL;
3053 }
3054 JVM_END
3055
3056
3057 /// JVM_RegisterMethodHandleMethods
3058
3059 #define LANG "Ljava/lang/"
3060 #define JLINV "Ljava/lang/invoke/"
3061
3062 #define OBJ LANG"Object;"
3063 #define CLS LANG"Class;"
3064 #define STRG LANG"String;"
3065 #define MT JLINV"MethodType;"
3066 #define MH JLINV"MethodHandle;"
3067 #define MEM JLINV"MemberName;"
3068 #define AMH JLINV"AdapterMethodHandle;"
3069 #define BMH JLINV"BoundMethodHandle;"
3070 #define DMH JLINV"DirectMethodHandle;"
3071
3072 #define CC (char*) /*cast a literal from (const char*)*/
3073 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
3074
3075 // These are the native methods on sun.invoke.MethodHandleNatives.
3076 static JNINativeMethod methods[] = {
3077 // void init(MemberName self, AccessibleObject ref)
3078 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHN_init_AMH)},
3079 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHN_init_BMH)},
3080 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHN_init_DMH)},
3081 {CC"init", CC"("MT")V", FN_PTR(MHN_init_MT)},
3082 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
3083 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
3084 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHN_resolve_Mem)},
3085 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHN_getTarget)},
3086 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
3087 // static native int getNamedCon(int which, Object[] name)
3088 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
3089 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
3090 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
3091 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}
3092 };
3093
3094 static JNINativeMethod invoke_methods[] = {
3095 // void init(MemberName self, AccessibleObject ref)
3096 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
3097 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
3098 };
3099
3100 // This one function is exported, used by NativeLookup.
3101
3102 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
3103 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK");
3104
3105 if (!EnableInvokeDynamic) {
3106 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
3107 return; // bind nothing
3108 }
3109
3110 bool enable_MH = true;
3111
3112 {
3113 ThreadToNativeFromVM ttnfv(thread);
3114
3115 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod));
3116 if (!env->ExceptionOccurred()) {
3117 const char* L_MH_name = (JLINV "MethodHandle");
3118 const char* MH_name = L_MH_name+1;
3119 jclass MH_class = env->FindClass(MH_name);
3120 status = env->RegisterNatives(MH_class, invoke_methods, sizeof(invoke_methods)/sizeof(JNINativeMethod));
3121 }
3122 if (env->ExceptionOccurred()) {
3123 MethodHandles::set_enabled(false);
3124 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
3125 enable_MH = false;
3126 env->ExceptionClear();
3127 }
3128 }
3129
3130 if (enable_MH) {
3131 methodOop raiseException_method = MethodHandles::resolve_raise_exception_method(CHECK);
3132 if (raiseException_method != NULL) {
3133 MethodHandles::set_raise_exception_method(raiseException_method);
3134 } else {
3135 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
3136 enable_MH = false;
3137 }
3138 }
3139
3140 if (enable_MH) {
3141 MethodHandles::generate_adapters();
3142 MethodHandles::set_enabled(true);
3143 }
3144 }
3145 JVM_END