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 "compiler/compileBroker.hpp"
28 #include "interpreter/interpreter.hpp"
29 #include "interpreter/oopMapCache.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "prims/methodHandles.hpp"
33 #include "prims/methodHandleWalk.hpp"
34 #include "runtime/compilationPolicy.hpp"
35 #include "runtime/javaCalls.hpp"
36 #include "runtime/reflection.hpp"
37 #include "runtime/signature.hpp"
38 #include "runtime/stubRoutines.hpp"
39
40 /*
41 * JSR 292 reference implementation: method handles
42 */
43
44 bool MethodHandles::_enabled = false; // set true after successful native linkage
45
46 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL};
47 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = {
48 "raise_exception",
49 "invokestatic", // how a MH emulates invokestatic
50 "invokespecial", // ditto for the other invokes...
51 "invokevirtual",
52 "invokeinterface",
53 "bound_ref", // these are for BMH...
54 "bound_int",
55 "bound_long",
56 "bound_ref_direct", // (direct versions have a direct methodOop)
57 "bound_int_direct",
58 "bound_long_direct",
59
60 // starting at _adapter_mh_first:
61 "adapter_retype_only", // these are for AMH...
62 "adapter_retype_raw",
63 "adapter_check_cast",
64 "adapter_prim_to_prim",
65 "adapter_ref_to_prim",
66 "adapter_prim_to_ref",
67 "adapter_swap_args",
68 "adapter_rot_args",
69 "adapter_dup_args",
70 "adapter_drop_args",
71 "adapter_collect_args",
72 "adapter_spread_args",
73 "adapter_fold_args",
74 "adapter_unused_13",
75
76 // optimized adapter types:
77 "adapter_swap_args/1",
78 "adapter_swap_args/2",
79 "adapter_rot_args/1,up",
80 "adapter_rot_args/1,down",
81 "adapter_rot_args/2,up",
82 "adapter_rot_args/2,down",
83 "adapter_prim_to_prim/i2i",
84 "adapter_prim_to_prim/l2i",
85 "adapter_prim_to_prim/d2f",
86 "adapter_prim_to_prim/i2l",
87 "adapter_prim_to_prim/f2d",
88 "adapter_ref_to_prim/unboxi",
89 "adapter_ref_to_prim/unboxl",
90
91 // return value handlers for collect/filter/fold adapters:
92 "return/ref",
93 "return/int",
94 "return/long",
95 "return/float",
96 "return/double",
97 "return/void",
98 "return/S0/ref",
99 "return/S1/ref",
100 "return/S2/ref",
101 "return/S3/ref",
102 "return/S4/ref",
103 "return/S5/ref",
104 "return/any",
105
106 // spreading (array length cases 0, 1, ...)
107 "adapter_spread/0",
108 "adapter_spread/1/ref",
109 "adapter_spread/2/ref",
110 "adapter_spread/3/ref",
111 "adapter_spread/4/ref",
112 "adapter_spread/5/ref",
113 "adapter_spread/ref",
114 "adapter_spread/byte",
115 "adapter_spread/char",
116 "adapter_spread/short",
117 "adapter_spread/int",
118 "adapter_spread/long",
119 "adapter_spread/float",
120 "adapter_spread/double",
121
122 // blocking filter/collect conversions:
123 "adapter_collect/ref",
124 "adapter_collect/int",
125 "adapter_collect/long",
126 "adapter_collect/float",
127 "adapter_collect/double",
128 "adapter_collect/void",
129 "adapter_collect/0/ref",
130 "adapter_collect/1/ref",
131 "adapter_collect/2/ref",
132 "adapter_collect/3/ref",
133 "adapter_collect/4/ref",
134 "adapter_collect/5/ref",
135 "adapter_filter/S0/ref",
136 "adapter_filter/S1/ref",
137 "adapter_filter/S2/ref",
138 "adapter_filter/S3/ref",
139 "adapter_filter/S4/ref",
140 "adapter_filter/S5/ref",
141 "adapter_collect/2/S0/ref",
142 "adapter_collect/2/S1/ref",
143 "adapter_collect/2/S2/ref",
144 "adapter_collect/2/S3/ref",
145 "adapter_collect/2/S4/ref",
146 "adapter_collect/2/S5/ref",
147
148 // blocking fold conversions:
149 "adapter_fold/ref",
150 "adapter_fold/int",
151 "adapter_fold/long",
152 "adapter_fold/float",
153 "adapter_fold/double",
154 "adapter_fold/void",
155 "adapter_fold/1/ref",
156 "adapter_fold/2/ref",
157 "adapter_fold/3/ref",
158 "adapter_fold/4/ref",
159 "adapter_fold/5/ref",
160
161 "adapter_opt_profiling",
162
163 NULL
164 };
165
166 // Adapters.
167 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
168
169 jobject MethodHandles::_raise_exception_method;
170
171 address MethodHandles::_adapter_return_handlers[CONV_TYPE_MASK+1];
172
173 #ifdef ASSERT
174 bool MethodHandles::spot_check_entry_names() {
175 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), "");
176 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), "");
177 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), "");
178 assert(!strcmp(entry_name(_adapter_fold_args), "adapter_fold_args"), "");
179 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), "");
180 assert(!strcmp(entry_name(_adapter_opt_spread_char), "adapter_spread/char"), "");
181 assert(!strcmp(entry_name(_adapter_opt_spread_double), "adapter_spread/double"), "");
182 assert(!strcmp(entry_name(_adapter_opt_collect_int), "adapter_collect/int"), "");
183 assert(!strcmp(entry_name(_adapter_opt_collect_0_ref), "adapter_collect/0/ref"), "");
184 assert(!strcmp(entry_name(_adapter_opt_collect_2_S3_ref), "adapter_collect/2/S3/ref"), "");
185 assert(!strcmp(entry_name(_adapter_opt_filter_S5_ref), "adapter_filter/S5/ref"), "");
186 assert(!strcmp(entry_name(_adapter_opt_fold_3_ref), "adapter_fold/3/ref"), "");
187 assert(!strcmp(entry_name(_adapter_opt_fold_void), "adapter_fold/void"), "");
188 return true;
189 }
190 #endif
191
192
193 //------------------------------------------------------------------------------
194 // MethodHandles::generate_adapters
195 //
196 void MethodHandles::generate_adapters() {
197 #ifdef TARGET_ARCH_NYI_6939861
198 if (FLAG_IS_DEFAULT(UseRicochetFrames)) UseRicochetFrames = false;
199 #endif
200 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
201
202 assert(_adapter_code == NULL, "generate only once");
203
204 ResourceMark rm;
205 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
206 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
207 if (_adapter_code == NULL)
208 vm_exit_out_of_memory(adapter_code_size, "CodeCache: no room for MethodHandles adapters");
209 CodeBuffer code(_adapter_code);
210 MethodHandlesAdapterGenerator g(&code);
211 g.generate();
212 }
213
214 //------------------------------------------------------------------------------
215 // MethodHandlesAdapterGenerator::generate
216 //
217 void MethodHandlesAdapterGenerator::generate() {
218 // Generate generic method handle adapters.
219 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST;
220 ek < MethodHandles::_EK_LIMIT;
221 ek = MethodHandles::EntryKind(1 + (int)ek)) {
222 if (MethodHandles::ek_supported(ek)) {
223 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek));
224 MethodHandles::generate_method_handle_stub(_masm, ek);
225 }
226 }
227 }
228
229
230 #ifdef TARGET_ARCH_NYI_6939861
231 // these defs belong in methodHandles_<arch>.cpp
232 frame MethodHandles::ricochet_frame_sender(const frame& fr, RegisterMap *map) {
233 ShouldNotCallThis();
234 return fr;
235 }
236 void MethodHandles::ricochet_frame_oops_do(const frame& fr, OopClosure* f, const RegisterMap* reg_map) {
237 ShouldNotCallThis();
238 }
239 #endif //TARGET_ARCH_NYI_6939861
240
241
242 //------------------------------------------------------------------------------
243 // MethodHandles::ek_supported
244 //
245 bool MethodHandles::ek_supported(MethodHandles::EntryKind ek) {
246 MethodHandles::EntryKind ek_orig = MethodHandles::ek_original_kind(ek);
247 switch (ek_orig) {
248 case _adapter_unused_13:
249 return false; // not defined yet
250 case _adapter_prim_to_ref:
251 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF);
252 case _adapter_collect_args:
253 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS);
254 case _adapter_fold_args:
255 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS);
256 case _adapter_opt_return_any:
257 return UseRicochetFrames;
258 #ifdef TARGET_ARCH_NYI_6939861
259 // ports before 6939861 supported only three kinds of spread ops
260 case _adapter_spread_args:
261 // restrict spreads to three kinds:
262 switch (ek) {
263 case _adapter_opt_spread_0:
264 case _adapter_opt_spread_1:
265 case _adapter_opt_spread_more:
266 break;
267 default:
268 return false;
269 break;
270 }
271 break;
272 #endif //TARGET_ARCH_NYI_6939861
273 }
274 return true;
275 }
276
277
278 void MethodHandles::set_enabled(bool z) {
279 if (_enabled != z) {
280 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
281 _enabled = z;
282 }
283 }
284
285 // Note: A method which does not have a TRAPS argument cannot block in the GC
286 // or throw exceptions. Such methods are used in this file to do something quick
287 // and local, like parse a data structure. For speed, such methods work on plain
288 // oops, not handles. Trapping methods uniformly operate on handles.
289
290 methodHandle MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype,
291 KlassHandle& receiver_limit_result, int& decode_flags_result) {
292 if (vmtarget == NULL) return methodHandle();
293 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding");
294 if (vmindex < 0) {
295 // this DMH performs no dispatch; it is directly bound to a methodOop
296 // A MemberName may either be directly bound to a methodOop,
297 // or it may use the klass/index form; both forms mean the same thing.
298 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result);
299 if ((decode_flags_result & _dmf_has_receiver) != 0
300 && java_lang_invoke_MethodType::is_instance(mtype)) {
301 // Extract receiver type restriction from mtype.ptypes[0].
302 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype);
303 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0);
304 if (java_lang_Class::is_instance(ptype0))
305 receiver_limit_result = java_lang_Class::as_klassOop(ptype0);
306 }
307 if (vmindex == methodOopDesc::nonvirtual_vtable_index) {
308 // this DMH can be an "invokespecial" version
309 decode_flags_result &= ~_dmf_does_dispatch;
310 } else {
311 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?");
312 }
313 return m;
314 } else {
315 assert(vmtarget->is_klass(), "must be class or interface");
316 decode_flags_result |= MethodHandles::_dmf_does_dispatch;
317 decode_flags_result |= MethodHandles::_dmf_has_receiver;
318 receiver_limit_result = (klassOop)vmtarget;
319 Klass* tk = Klass::cast((klassOop)vmtarget);
320 if (tk->is_interface()) {
321 // an itable linkage is <interface, itable index>
322 decode_flags_result |= MethodHandles::_dmf_from_interface;
323 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex);
324 } else {
325 if (!tk->oop_is_instance())
326 tk = instanceKlass::cast(SystemDictionary::Object_klass());
327 return ((instanceKlass*)tk)->method_at_vtable(vmindex);
328 }
329 }
330 }
331
332 // MemberName and DirectMethodHandle have the same linkage to the JVM internals.
333 // (MemberName is the non-operational name used for queries and setup.)
334
335 methodHandle MethodHandles::decode_DirectMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
336 oop vmtarget = java_lang_invoke_DirectMethodHandle::vmtarget(mh);
337 int vmindex = java_lang_invoke_DirectMethodHandle::vmindex(mh);
338 oop mtype = java_lang_invoke_DirectMethodHandle::type(mh);
339 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result);
340 }
341
342 methodHandle MethodHandles::decode_BoundMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
343 assert(java_lang_invoke_BoundMethodHandle::is_instance(mh), "");
344 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), "");
345 for (oop bmh = mh;;) {
346 // Bound MHs can be stacked to bind several arguments.
347 oop target = java_lang_invoke_MethodHandle::vmtarget(bmh);
348 if (target == NULL) return methodHandle();
349 decode_flags_result |= MethodHandles::_dmf_binds_argument;
350 klassOop tk = target->klass();
351 if (tk == SystemDictionary::BoundMethodHandle_klass()) {
352 bmh = target;
353 continue;
354 } else {
355 if (java_lang_invoke_MethodHandle::is_subclass(tk)) {
356 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH");
357 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
358 } else {
359 // Optimized case: binding a receiver to a non-dispatched DMH
360 // short-circuits directly to the methodOop.
361 // (It might be another argument besides a receiver also.)
362 assert(target->is_method(), "must be a simple method");
363 decode_flags_result |= MethodHandles::_dmf_binds_method;
364 methodOop m = (methodOop) target;
365 if (!m->is_static())
366 decode_flags_result |= MethodHandles::_dmf_has_receiver;
367 return m;
368 }
369 }
370 }
371 }
372
373 methodHandle MethodHandles::decode_AdapterMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
374 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), "");
375 for (oop amh = mh;;) {
376 // Adapter MHs can be stacked to convert several arguments.
377 int conv_op = adapter_conversion_op(java_lang_invoke_AdapterMethodHandle::conversion(amh));
378 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK;
379 oop target = java_lang_invoke_MethodHandle::vmtarget(amh);
380 if (target == NULL) return methodHandle();
381 klassOop tk = target->klass();
382 if (tk == SystemDictionary::AdapterMethodHandle_klass()) {
383 amh = target;
384 continue;
385 } else {
386 // must be a BMH (which will bind some more arguments) or a DMH (for the final call)
387 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
388 }
389 }
390 }
391
392 methodHandle MethodHandles::decode_MethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
393 if (mh == NULL) return methodHandle();
394 klassOop mhk = mh->klass();
395 assert(java_lang_invoke_MethodHandle::is_subclass(mhk), "must be a MethodHandle");
396 if (mhk == SystemDictionary::DirectMethodHandle_klass()) {
397 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result);
398 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) {
399 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
400 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) {
401 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result);
402 } else if (java_lang_invoke_BoundMethodHandle::is_subclass(mhk)) {
403 // could be a JavaMethodHandle (but not an adapter MH)
404 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
405 } else {
406 assert(false, "cannot parse this MH");
407 return methodHandle(); // random MH?
408 }
409 }
410
411 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) {
412 assert(m->is_method(), "");
413 if (m->is_static()) {
414 // check that signature begins '(L' or '([' (not '(I', '()', etc.)
415 Symbol* sig = m->signature();
416 BasicType recv_bt = char2type(sig->byte_at(1));
417 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')'
418 assert(sig->byte_at(0) == '(', "must be method sig");
419 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY)
420 // decode_flags_result |= _dmf_has_receiver;
421 } else {
422 // non-static method
423 decode_flags_result |= _dmf_has_receiver;
424 if (!m->can_be_statically_bound() && !m->is_initializer()) {
425 decode_flags_result |= _dmf_does_dispatch;
426 if (Klass::cast(m->method_holder())->is_interface())
427 decode_flags_result |= _dmf_from_interface;
428 }
429 }
430 return m;
431 }
432
433
434 // A trusted party is handing us a cookie to determine a method.
435 // Let's boil it down to the method oop they really want.
436 methodHandle MethodHandles::decode_method(oop x, KlassHandle& receiver_limit_result, int& decode_flags_result) {
437 decode_flags_result = 0;
438 receiver_limit_result = KlassHandle();
439 klassOop xk = x->klass();
440 if (xk == Universe::methodKlassObj()) {
441 return decode_methodOop((methodOop) x, decode_flags_result);
442 } else if (xk == SystemDictionary::MemberName_klass()) {
443 // Note: This only works if the MemberName has already been resolved.
444 return decode_MemberName(x, receiver_limit_result, decode_flags_result);
445 } else if (java_lang_invoke_MethodHandle::is_subclass(xk)) {
446 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result);
447 } else if (xk == SystemDictionary::reflect_Method_klass()) {
448 oop clazz = java_lang_reflect_Method::clazz(x);
449 int slot = java_lang_reflect_Method::slot(x);
450 klassOop k = java_lang_Class::as_klassOop(clazz);
451 if (k != NULL && Klass::cast(k)->oop_is_instance())
452 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
453 decode_flags_result);
454 } else if (xk == SystemDictionary::reflect_Constructor_klass()) {
455 oop clazz = java_lang_reflect_Constructor::clazz(x);
456 int slot = java_lang_reflect_Constructor::slot(x);
457 klassOop k = java_lang_Class::as_klassOop(clazz);
458 if (k != NULL && Klass::cast(k)->oop_is_instance())
459 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
460 decode_flags_result);
461 } else {
462 // unrecognized object
463 assert(!x->is_method(), "already checked");
464 assert(!java_lang_invoke_MemberName::is_instance(x), "already checked");
465 }
466 return methodHandle();
467 }
468
469
470 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) {
471 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass())
472 return 0; // no push/pop
473 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh);
474 int last_vmslots = 0;
475 oop last_mh = mh;
476 for (;;) {
477 oop target = java_lang_invoke_MethodHandle::vmtarget(last_mh);
478 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
479 last_vmslots = java_lang_invoke_MethodHandle::vmslots(target);
480 break;
481 } else if (!java_lang_invoke_MethodHandle::is_instance(target)) {
482 // might be klass or method
483 assert(target->is_method(), "must get here with a direct ref to method");
484 last_vmslots = methodOop(target)->size_of_parameters();
485 break;
486 }
487 last_mh = target;
488 }
489 // If I am called with fewer VM slots than my ultimate callee,
490 // it must be that I push the additionally needed slots.
491 // Likewise if am called with more VM slots, I will pop them.
492 return (last_vmslots - this_vmslots);
493 }
494
495
496 // MemberName support
497
498 // import java_lang_invoke_MemberName.*
499 enum {
500 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
501 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
502 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
503 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
504 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
505 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
506 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE,
507 VM_INDEX_UNINITIALIZED = java_lang_invoke_MemberName::VM_INDEX_UNINITIALIZED
508 };
509
510 Handle MethodHandles::new_MemberName(TRAPS) {
511 Handle empty;
512 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
513 if (!k->is_initialized()) k->initialize(CHECK_(empty));
514 return Handle(THREAD, k->allocate_instance(THREAD));
515 }
516
517 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) {
518 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) {
519 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
520 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
521 int mods = java_lang_reflect_Field::modifiers(target_oop);
522 klassOop k = java_lang_Class::as_klassOop(clazz);
523 int offset = instanceKlass::cast(k)->offset_from_fields(slot);
524 init_MemberName(mname_oop, k, accessFlags_from(mods), offset);
525 } else {
526 KlassHandle receiver_limit; int decode_flags = 0;
527 methodHandle m = MethodHandles::decode_method(target_oop, receiver_limit, decode_flags);
528 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
529 init_MemberName(mname_oop, m(), do_dispatch);
530 }
531 }
532
533 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) {
534 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD)
535 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ));
536 oop vmtarget = m;
537 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet
538 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound())
539 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch
540 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value");
541 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
542 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
543 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
544 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror());
545 }
546
547 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) {
548 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ));
549 oop vmtarget = field_holder;
550 int vmindex = offset; // determines the field uniquely when combined with static bit
551 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex");
552 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
553 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
554 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
555 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror());
556 }
557
558
559 methodHandle MethodHandles::decode_MemberName(oop mname, KlassHandle& receiver_limit_result, int& decode_flags_result) {
560 methodHandle empty;
561 int flags = java_lang_invoke_MemberName::flags(mname);
562 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return empty; // not invocable
563 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname);
564 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
565 if (vmindex == VM_INDEX_UNINITIALIZED) return empty; // not resolved
566 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result);
567 oop clazz = java_lang_invoke_MemberName::clazz(mname);
568 if (clazz != NULL && java_lang_Class::is_instance(clazz)) {
569 klassOop klass = java_lang_Class::as_klassOop(clazz);
570 if (klass != NULL) receiver_limit_result = klass;
571 }
572 return m;
573 }
574
575 // convert the external string or reflective type to an internal signature
576 Symbol* MethodHandles::convert_to_signature(oop type_str, bool polymorphic, TRAPS) {
577 if (java_lang_invoke_MethodType::is_instance(type_str)) {
578 return java_lang_invoke_MethodType::as_signature(type_str, polymorphic, CHECK_NULL);
579 } else if (java_lang_Class::is_instance(type_str)) {
580 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
581 } else if (java_lang_String::is_instance(type_str)) {
582 if (polymorphic) {
583 return java_lang_String::as_symbol(type_str, CHECK_NULL);
584 } else {
585 return java_lang_String::as_symbol_or_null(type_str);
586 }
587 } else {
588 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
589 }
590 }
591
592 // An unresolved member name is a mere symbolic reference.
593 // Resolving it plants a vmtarget/vmindex in it,
594 // which refers dirctly to JVM internals.
595 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
596 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
597 #ifdef ASSERT
598 // If this assert throws, renegotiate the sentinel value used by the Java code,
599 // so that it is distinct from any valid vtable index value, and any special
600 // values defined in methodOopDesc::VtableIndexFlag.
601 // The point of the slop is to give the Java code and the JVM some room
602 // to independently specify sentinel values.
603 const int sentinel_slop = 10;
604 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop;
605 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels");
606 #endif
607 if (java_lang_invoke_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED)
608 return; // already resolved
609 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
610 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
611 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
612 int flags = java_lang_invoke_MemberName::flags(mname());
613
614 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
615 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve");
616 }
617
618 instanceKlassHandle defc;
619 {
620 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop());
621 if (defc_klassOop == NULL) return; // a primitive; no resolution possible
622 if (!Klass::cast(defc_klassOop)->oop_is_instance()) {
623 if (!Klass::cast(defc_klassOop)->oop_is_array()) return;
624 defc_klassOop = SystemDictionary::Object_klass();
625 }
626 defc = instanceKlassHandle(THREAD, defc_klassOop);
627 }
628 if (defc.is_null()) {
629 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class");
630 }
631 defc->link_class(CHECK); // possible safepoint
632
633 // convert the external string name to an internal symbol
634 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
635 if (name == NULL) return; // no such name
636 if (name == vmSymbols::class_initializer_name())
637 return; // illegal name
638
639 Handle polymorphic_method_type;
640 bool polymorphic_signature = false;
641 if ((flags & ALL_KINDS) == IS_METHOD &&
642 (defc() == SystemDictionary::MethodHandle_klass() &&
643 methodOopDesc::is_method_handle_invoke_name(name))) {
644 polymorphic_signature = true;
645 }
646
647 // convert the external string or reflective type to an internal signature
648 TempNewSymbol type = convert_to_signature(type_str(), polymorphic_signature, CHECK);
649 if (java_lang_invoke_MethodType::is_instance(type_str()) && polymorphic_signature) {
650 polymorphic_method_type = type_str; // preserve exactly
651 }
652 if (type == NULL) return; // no such signature exists in the VM
653
654 // Time to do the lookup.
655 switch (flags & ALL_KINDS) {
656 case IS_METHOD:
657 {
658 CallInfo result;
659 {
660 EXCEPTION_MARK;
661 if ((flags & JVM_ACC_STATIC) != 0) {
662 LinkResolver::resolve_static_call(result,
663 defc, name, type, KlassHandle(), false, false, THREAD);
664 } else if (defc->is_interface()) {
665 LinkResolver::resolve_interface_call(result, Handle(), defc,
666 defc, name, type, KlassHandle(), false, false, THREAD);
667 } else {
668 LinkResolver::resolve_virtual_call(result, Handle(), defc,
669 defc, name, type, KlassHandle(), false, false, THREAD);
670 }
671 if (HAS_PENDING_EXCEPTION) {
672 CLEAR_PENDING_EXCEPTION;
673 break; // go to second chance
674 }
675 }
676 methodHandle m = result.resolved_method();
677 oop vmtarget = NULL;
678 int vmindex = methodOopDesc::nonvirtual_vtable_index;
679 if (defc->is_interface()) {
680 vmindex = klassItable::compute_itable_index(m());
681 assert(vmindex >= 0, "");
682 } else if (result.has_vtable_index()) {
683 vmindex = result.vtable_index();
684 assert(vmindex >= 0, "");
685 }
686 assert(vmindex != VM_INDEX_UNINITIALIZED, "");
687 if (vmindex < 0) {
688 assert(result.is_statically_bound(), "");
689 vmtarget = m();
690 } else {
691 vmtarget = result.resolved_klass()->as_klassOop();
692 }
693 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
694 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
695 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
696 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
697 DEBUG_ONLY(KlassHandle junk1; int junk2);
698 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(),
699 "properly stored for later decoding");
700 return;
701 }
702 case IS_CONSTRUCTOR:
703 {
704 CallInfo result;
705 {
706 EXCEPTION_MARK;
707 if (name == vmSymbols::object_initializer_name()) {
708 LinkResolver::resolve_special_call(result,
709 defc, name, type, KlassHandle(), false, THREAD);
710 } else {
711 break; // will throw after end of switch
712 }
713 if (HAS_PENDING_EXCEPTION) {
714 CLEAR_PENDING_EXCEPTION;
715 return;
716 }
717 }
718 assert(result.is_statically_bound(), "");
719 methodHandle m = result.resolved_method();
720 oop vmtarget = m();
721 int vmindex = methodOopDesc::nonvirtual_vtable_index;
722 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
723 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
724 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
725 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
726 DEBUG_ONLY(KlassHandle junk1; int junk2);
727 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(),
728 "properly stored for later decoding");
729 return;
730 }
731 case IS_FIELD:
732 {
733 // This is taken from LinkResolver::resolve_field, sans access checks.
734 fieldDescriptor fd; // find_field initializes fd if found
735 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd));
736 // check if field exists; i.e., if a klass containing the field def has been selected
737 if (sel_klass.is_null()) return;
738 oop vmtarget = sel_klass->as_klassOop();
739 int vmindex = fd.offset();
740 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS);
741 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen
742 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
743 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
744 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
745 return;
746 }
747 default:
748 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
749 }
750
751 // Second chance.
752 if (polymorphic_method_type.not_null()) {
753 // Look on a non-null class loader.
754 Handle cur_class_loader;
755 const int nptypes = java_lang_invoke_MethodType::ptype_count(polymorphic_method_type());
756 for (int i = 0; i <= nptypes; i++) {
757 oop type_mirror;
758 if (i < nptypes) type_mirror = java_lang_invoke_MethodType::ptype(polymorphic_method_type(), i);
759 else type_mirror = java_lang_invoke_MethodType::rtype(polymorphic_method_type());
760 klassOop example_type = java_lang_Class::as_klassOop(type_mirror);
761 if (example_type == NULL) continue;
762 oop class_loader = Klass::cast(example_type)->class_loader();
763 if (class_loader == NULL || class_loader == cur_class_loader()) continue;
764 cur_class_loader = Handle(THREAD, class_loader);
765 methodOop m = SystemDictionary::find_method_handle_invoke(name,
766 type,
767 KlassHandle(THREAD, example_type),
768 THREAD);
769 if (HAS_PENDING_EXCEPTION) {
770 CLEAR_PENDING_EXCEPTION;
771 m = NULL;
772 // try again with a different class loader...
773 }
774 if (m != NULL &&
775 m->is_method_handle_invoke() &&
776 java_lang_invoke_MethodType::equals(polymorphic_method_type(), m->method_handle_type())) {
777 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
778 java_lang_invoke_MemberName::set_vmtarget(mname(), m);
779 java_lang_invoke_MemberName::set_vmindex(mname(), m->vtable_index());
780 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
781 return;
782 }
783 }
784 }
785 }
786
787 // Conversely, a member name which is only initialized from JVM internals
788 // may have null defc, name, and type fields.
789 // Resolving it plants a vmtarget/vmindex in it,
790 // which refers directly to JVM internals.
791 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
792 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
793 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
794 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
795 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) {
796 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
797 }
798
799 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
800 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
801 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
802 int flags = java_lang_invoke_MemberName::flags(mname());
803
804 if (suppress != 0) {
805 if (suppress & _suppress_defc) have_defc = true;
806 if (suppress & _suppress_name) have_name = true;
807 if (suppress & _suppress_type) have_type = true;
808 }
809
810 if (have_defc && have_name && have_type) return; // nothing needed
811
812 switch (flags & ALL_KINDS) {
813 case IS_METHOD:
814 case IS_CONSTRUCTOR:
815 {
816 KlassHandle receiver_limit; int decode_flags = 0;
817 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit, decode_flags);
818 if (m.is_null()) break;
819 if (!have_defc) {
820 klassOop defc = m->method_holder();
821 if (receiver_limit.not_null() && receiver_limit() != defc
822 && Klass::cast(receiver_limit())->is_subtype_of(defc))
823 defc = receiver_limit();
824 java_lang_invoke_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror());
825 }
826 if (!have_name) {
827 //not java_lang_String::create_from_symbol; let's intern member names
828 Handle name = StringTable::intern(m->name(), CHECK);
829 java_lang_invoke_MemberName::set_name(mname(), name());
830 }
831 if (!have_type) {
832 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
833 java_lang_invoke_MemberName::set_type(mname(), type());
834 }
835 return;
836 }
837 case IS_FIELD:
838 {
839 // This is taken from LinkResolver::resolve_field, sans access checks.
840 if (!vmtarget->is_klass()) break;
841 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break;
842 instanceKlassHandle defc(THREAD, (klassOop) vmtarget);
843 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
844 fieldDescriptor fd; // find_field initializes fd if found
845 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
846 break; // cannot expand
847 if (!have_defc) {
848 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
849 }
850 if (!have_name) {
851 //not java_lang_String::create_from_symbol; let's intern member names
852 Handle name = StringTable::intern(fd.name(), CHECK);
853 java_lang_invoke_MemberName::set_name(mname(), name());
854 }
855 if (!have_type) {
856 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
857 java_lang_invoke_MemberName::set_type(mname(), type());
858 }
859 return;
860 }
861 }
862 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
863 }
864
865 int MethodHandles::find_MemberNames(klassOop k,
866 Symbol* name, Symbol* sig,
867 int mflags, klassOop caller,
868 int skip, objArrayOop results) {
869 DEBUG_ONLY(No_Safepoint_Verifier nsv);
870 // this code contains no safepoints!
871
872 // %%% take caller into account!
873
874 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1;
875
876 int rfill = 0, rlimit = results->length(), rskip = skip;
877 // overflow measurement:
878 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
879
880 int match_flags = mflags;
881 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
882 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
883 bool local_only = !(search_superc | search_intfc);
884 bool classes_only = false;
885
886 if (name != NULL) {
887 if (name->utf8_length() == 0) return 0; // a match is not possible
888 }
889 if (sig != NULL) {
890 if (sig->utf8_length() == 0) return 0; // a match is not possible
891 if (sig->byte_at(0) == '(')
892 match_flags &= ~(IS_FIELD | IS_TYPE);
893 else
894 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
895 }
896
897 if ((match_flags & IS_TYPE) != 0) {
898 // NYI, and Core Reflection works quite well for this query
899 }
900
901 if ((match_flags & IS_FIELD) != 0) {
902 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
903 if (name != NULL && st.name() != name)
904 continue;
905 if (sig != NULL && st.signature() != sig)
906 continue;
907 // passed the filters
908 if (rskip > 0) {
909 --rskip;
910 } else if (rfill < rlimit) {
911 oop result = results->obj_at(rfill++);
912 if (!java_lang_invoke_MemberName::is_instance(result))
913 return -99; // caller bug!
914 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset());
915 } else if (++overflow >= overflow_limit) {
916 match_flags = 0; break; // got tired of looking at overflow
917 }
918 }
919 }
920
921 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
922 // watch out for these guys:
923 Symbol* init_name = vmSymbols::object_initializer_name();
924 Symbol* clinit_name = vmSymbols::class_initializer_name();
925 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
926 bool negate_name_test = false;
927 // fix name so that it captures the intention of IS_CONSTRUCTOR
928 if (!(match_flags & IS_METHOD)) {
929 // constructors only
930 if (name == NULL) {
931 name = init_name;
932 } else if (name != init_name) {
933 return 0; // no constructors of this method name
934 }
935 } else if (!(match_flags & IS_CONSTRUCTOR)) {
936 // methods only
937 if (name == NULL) {
938 name = init_name;
939 negate_name_test = true; // if we see the name, we *omit* the entry
940 } else if (name == init_name) {
941 return 0; // no methods of this constructor name
942 }
943 } else {
944 // caller will accept either sort; no need to adjust name
945 }
946 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
947 methodOop m = st.method();
948 Symbol* m_name = m->name();
949 if (m_name == clinit_name)
950 continue;
951 if (name != NULL && ((m_name != name) ^ negate_name_test))
952 continue;
953 if (sig != NULL && m->signature() != sig)
954 continue;
955 // passed the filters
956 if (rskip > 0) {
957 --rskip;
958 } else if (rfill < rlimit) {
959 oop result = results->obj_at(rfill++);
960 if (!java_lang_invoke_MemberName::is_instance(result))
961 return -99; // caller bug!
962 MethodHandles::init_MemberName(result, m, true);
963 } else if (++overflow >= overflow_limit) {
964 match_flags = 0; break; // got tired of looking at overflow
965 }
966 }
967 }
968
969 // return number of elements we at leasted wanted to initialize
970 return rfill + overflow;
971 }
972
973
974 // Decode this java.lang.Class object into an instanceKlass, if possible.
975 // Throw IAE if not
976 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) {
977 instanceKlassHandle empty;
978 klassOop caller = NULL;
979 if (java_lang_Class::is_instance(java_mirror_oop)) {
980 caller = java_lang_Class::as_klassOop(java_mirror_oop);
981 }
982 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) {
983 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty);
984 }
985 return instanceKlassHandle(THREAD, caller);
986 }
987
988
989
990 // Decode the vmtarget field of a method handle.
991 // Sanitize out methodOops, klassOops, and any other non-Java data.
992 // This is for debugging and reflection.
993 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) {
994 assert(java_lang_invoke_MethodHandle::is_instance(mh()), "must be a MH");
995 if (format == ETF_FORCE_DIRECT_HANDLE ||
996 format == ETF_COMPILE_DIRECT_HANDLE) {
997 // Internal function for stress testing.
998 Handle mt = java_lang_invoke_MethodHandle::type(mh());
999 int invocation_count = 10000;
1000 TempNewSymbol signature = java_lang_invoke_MethodType::as_signature(mt(), true, CHECK_NULL);
1001 bool omit_receiver_argument = true;
1002 MethodHandleCompiler mhc(mh, vmSymbols::invoke_name(), signature, invocation_count, omit_receiver_argument, CHECK_NULL);
1003 methodHandle m = mhc.compile(CHECK_NULL);
1004 if (StressMethodHandleWalk && Verbose || PrintMiscellaneous) {
1005 tty->print_cr("MethodHandleNatives.getTarget(%s)",
1006 format == ETF_FORCE_DIRECT_HANDLE ? "FORCE_DIRECT" : "COMPILE_DIRECT");
1007 if (Verbose) {
1008 m->print_codes();
1009 }
1010 }
1011 if (StressMethodHandleWalk) {
1012 InterpreterOopMap mask;
1013 OopMapCache::compute_one_oop_map(m, m->code_size() - 1, &mask);
1014 }
1015 if ((format == ETF_COMPILE_DIRECT_HANDLE ||
1016 CompilationPolicy::must_be_compiled(m))
1017 && !instanceKlass::cast(m->method_holder())->is_not_initialized()
1018 && CompilationPolicy::can_be_compiled(m)) {
1019 // Force compilation
1020 CompileBroker::compile_method(m, InvocationEntryBci,
1021 CompilationPolicy::policy()->initial_compile_level(),
1022 methodHandle(), 0, "MethodHandleNatives.getTarget",
1023 CHECK_NULL);
1024 }
1025 // Now wrap m in a DirectMethodHandle.
1026 instanceKlassHandle dmh_klass(THREAD, SystemDictionary::DirectMethodHandle_klass());
1027 Handle dmh = dmh_klass->allocate_instance_handle(CHECK_NULL);
1028 JavaValue ignore_result(T_VOID);
1029 Symbol* init_name = vmSymbols::object_initializer_name();
1030 Symbol* init_sig = vmSymbols::notifyGenericMethodType_signature();
1031 JavaCalls::call_special(&ignore_result, dmh,
1032 SystemDictionaryHandles::MethodHandle_klass(), init_name, init_sig,
1033 java_lang_invoke_MethodHandle::type(mh()), CHECK_NULL);
1034 MethodHandles::init_DirectMethodHandle(dmh, m, false, CHECK_NULL);
1035 return dmh();
1036 }
1037 if (format == ETF_HANDLE_OR_METHOD_NAME) {
1038 oop target = java_lang_invoke_MethodHandle::vmtarget(mh());
1039 if (target == NULL) {
1040 return NULL; // unformed MH
1041 }
1042 klassOop tklass = target->klass();
1043 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) {
1044 return target; // target is another MH (or something else?)
1045 }
1046 }
1047 if (format == ETF_DIRECT_HANDLE) {
1048 oop target = mh();
1049 for (;;) {
1050 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
1051 return target;
1052 }
1053 if (!java_lang_invoke_MethodHandle::is_instance(target)){
1054 return NULL; // unformed MH
1055 }
1056 target = java_lang_invoke_MethodHandle::vmtarget(target);
1057 }
1058 }
1059 // cases of metadata in MH.vmtarget:
1060 // - AMH can have methodOop for static invoke with bound receiver
1061 // - DMH can have methodOop for static invoke (on variable receiver)
1062 // - DMH can have klassOop for dispatched (non-static) invoke
1063 KlassHandle receiver_limit; int decode_flags = 0;
1064 methodHandle m = decode_MethodHandle(mh(), receiver_limit, decode_flags);
1065 if (m.is_null()) return NULL;
1066 switch (format) {
1067 case ETF_REFLECT_METHOD:
1068 // same as jni_ToReflectedMethod:
1069 if (m->is_initializer()) {
1070 return Reflection::new_constructor(m, THREAD);
1071 } else {
1072 return Reflection::new_method(m, UseNewReflection, false, THREAD);
1073 }
1074
1075 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle
1076 case ETF_METHOD_NAME:
1077 {
1078 if (SystemDictionary::MemberName_klass() == NULL) break;
1079 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass());
1080 mname_klass->initialize(CHECK_NULL);
1081 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); // possible safepoint
1082 java_lang_invoke_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED);
1083 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
1084 init_MemberName(mname(), m(), do_dispatch);
1085 expand_MemberName(mname, 0, CHECK_NULL);
1086 return mname();
1087 }
1088 }
1089
1090 // Unknown format code.
1091 char msg[50];
1092 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format);
1093 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg);
1094 }
1095
1096 static const char* always_null_names[] = {
1097 "java/lang/Void",
1098 "java/lang/Null",
1099 //"java/lang/Nothing",
1100 "sun/dyn/empty/Empty",
1101 "sun/invoke/empty/Empty",
1102 NULL
1103 };
1104
1105 static bool is_always_null_type(klassOop klass) {
1106 if (klass == NULL) return false; // safety
1107 if (!Klass::cast(klass)->oop_is_instance()) return false;
1108 instanceKlass* ik = instanceKlass::cast(klass);
1109 // Must be on the boot class path:
1110 if (ik->class_loader() != NULL) return false;
1111 // Check the name.
1112 Symbol* name = ik->name();
1113 for (int i = 0; ; i++) {
1114 const char* test_name = always_null_names[i];
1115 if (test_name == NULL) break;
1116 if (name->equals(test_name))
1117 return true;
1118 }
1119 return false;
1120 }
1121
1122 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) {
1123 if (dst == NULL) return true;
1124 if (src == NULL) return (dst != SystemDictionary::Object_klass());
1125 if (src == dst || dst == SystemDictionary::Object_klass())
1126 return false; // quickest checks
1127 Klass* srck = Klass::cast(src);
1128 Klass* dstk = Klass::cast(dst);
1129 if (dstk->is_interface()) {
1130 // interface receivers can safely be viewed as untyped,
1131 // because interface calls always include a dynamic check
1132 //dstk = Klass::cast(SystemDictionary::Object_klass());
1133 return false;
1134 }
1135 if (srck->is_interface()) {
1136 // interface arguments must be viewed as untyped
1137 //srck = Klass::cast(SystemDictionary::Object_klass());
1138 return true;
1139 }
1140 if (is_always_null_type(src)) {
1141 // some source types are known to be never instantiated;
1142 // they represent references which are always null
1143 // such null references never fail to convert safely
1144 return false;
1145 }
1146 return !srck->is_subclass_of(dstk->as_klassOop());
1147 }
1148
1149 static oop object_java_mirror() {
1150 return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
1151 }
1152
1153 bool MethodHandles::is_float_fixed_reinterpretation_cast(BasicType src, BasicType dst) {
1154 if (src == T_FLOAT) return dst == T_INT;
1155 if (src == T_INT) return dst == T_FLOAT;
1156 if (src == T_DOUBLE) return dst == T_LONG;
1157 if (src == T_LONG) return dst == T_DOUBLE;
1158 return false;
1159 }
1160
1161 bool MethodHandles::same_basic_type_for_arguments(BasicType src,
1162 BasicType dst,
1163 bool raw,
1164 bool for_return) {
1165 if (for_return) {
1166 // return values can always be forgotten:
1167 if (dst == T_VOID) return true;
1168 if (src == T_VOID) return raw && (dst == T_INT);
1169 // We allow caller to receive a garbage int, which is harmless.
1170 // This trick is pulled by trusted code (see VerifyType.canPassRaw).
1171 }
1172 assert(src != T_VOID && dst != T_VOID, "should not be here");
1173 if (src == dst) return true;
1174 if (type2size[src] != type2size[dst]) return false;
1175 if (src == T_OBJECT || dst == T_OBJECT) return false;
1176 if (raw) return true; // bitwise reinterpretation; caller guarantees safety
1177 // allow reinterpretation casts for integral widening
1178 if (is_subword_type(src)) { // subwords can fit in int or other subwords
1179 if (dst == T_INT) // any subword fits in an int
1180 return true;
1181 if (src == T_BOOLEAN) // boolean fits in any subword
1182 return is_subword_type(dst);
1183 if (src == T_BYTE && dst == T_SHORT)
1184 return true; // remaining case: byte fits in short
1185 }
1186 // allow float/fixed reinterpretation casts
1187 if (is_float_fixed_reinterpretation_cast(src, dst))
1188 return true;
1189 return false;
1190 }
1191
1192 const char* MethodHandles::check_method_receiver(methodOop m,
1193 klassOop passed_recv_type) {
1194 assert(!m->is_static(), "caller resp.");
1195 if (passed_recv_type == NULL)
1196 return "receiver type is primitive";
1197 if (class_cast_needed(passed_recv_type, m->method_holder())) {
1198 Klass* formal = Klass::cast(m->method_holder());
1199 return SharedRuntime::generate_class_cast_message("receiver type",
1200 formal->external_name());
1201 }
1202 return NULL; // checks passed
1203 }
1204
1205 // Verify that m's signature can be called type-safely by a method handle
1206 // of the given method type 'mtype'.
1207 // It takes a TRAPS argument because it must perform symbol lookups.
1208 void MethodHandles::verify_method_signature(methodHandle m,
1209 Handle mtype,
1210 int first_ptype_pos,
1211 KlassHandle insert_ptype,
1212 TRAPS) {
1213 Handle mhi_type;
1214 if (m->is_method_handle_invoke()) {
1215 // use this more exact typing instead of the symbolic signature:
1216 mhi_type = Handle(THREAD, m->method_handle_type());
1217 }
1218 objArrayHandle ptypes(THREAD, java_lang_invoke_MethodType::ptypes(mtype()));
1219 int pnum = first_ptype_pos;
1220 int pmax = ptypes->length();
1221 int anum = 0; // method argument
1222 const char* err = NULL;
1223 ResourceMark rm(THREAD);
1224 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
1225 oop ptype_oop = NULL;
1226 if (ss.at_return_type()) {
1227 if (pnum != pmax)
1228 { err = "too many arguments"; break; }
1229 ptype_oop = java_lang_invoke_MethodType::rtype(mtype());
1230 } else {
1231 if (pnum >= pmax)
1232 { err = "not enough arguments"; break; }
1233 if (pnum >= 0)
1234 ptype_oop = ptypes->obj_at(pnum);
1235 else if (insert_ptype.is_null())
1236 ptype_oop = NULL;
1237 else
1238 ptype_oop = insert_ptype->java_mirror();
1239 pnum += 1;
1240 anum += 1;
1241 }
1242 KlassHandle pklass;
1243 BasicType ptype = T_OBJECT;
1244 bool have_ptype = false;
1245 // missing ptype_oop does not match any non-reference; use Object to report the error
1246 pklass = SystemDictionaryHandles::Object_klass();
1247 if (ptype_oop != NULL) {
1248 have_ptype = true;
1249 klassOop pklass_oop = NULL;
1250 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass_oop);
1251 pklass = KlassHandle(THREAD, pklass_oop);
1252 }
1253 ptype_oop = NULL; //done with this
1254 KlassHandle aklass;
1255 BasicType atype = ss.type();
1256 if (atype == T_ARRAY) atype = T_OBJECT; // fold all refs to T_OBJECT
1257 if (atype == T_OBJECT) {
1258 if (!have_ptype) {
1259 // null matches any reference
1260 continue;
1261 }
1262 if (mhi_type.is_null()) {
1263 // If we fail to resolve types at this point, we will usually throw an error.
1264 TempNewSymbol name = ss.as_symbol_or_null();
1265 if (name != NULL) {
1266 instanceKlass* mk = instanceKlass::cast(m->method_holder());
1267 Handle loader(THREAD, mk->class_loader());
1268 Handle domain(THREAD, mk->protection_domain());
1269 klassOop aklass_oop = SystemDictionary::resolve_or_null(name, loader, domain, CHECK);
1270 if (aklass_oop != NULL)
1271 aklass = KlassHandle(THREAD, aklass_oop);
1272 if (aklass.is_null() &&
1273 pklass.not_null() &&
1274 loader.is_null() &&
1275 pklass->name() == name)
1276 // accept name equivalence here, since that's the best we can do
1277 aklass = pklass;
1278 }
1279 } else {
1280 // for method handle invokers we don't look at the name in the signature
1281 oop atype_oop;
1282 if (ss.at_return_type())
1283 atype_oop = java_lang_invoke_MethodType::rtype(mhi_type());
1284 else
1285 atype_oop = java_lang_invoke_MethodType::ptype(mhi_type(), anum-1);
1286 klassOop aklass_oop = NULL;
1287 atype = java_lang_Class::as_BasicType(atype_oop, &aklass_oop);
1288 aklass = KlassHandle(THREAD, aklass_oop);
1289 }
1290 }
1291 if (!ss.at_return_type()) {
1292 err = check_argument_type_change(ptype, pklass(), atype, aklass(), anum);
1293 } else {
1294 err = check_return_type_change(atype, aklass(), ptype, pklass()); // note reversal!
1295 }
1296 if (err != NULL) break;
1297 }
1298
1299 if (err != NULL) {
1300 #ifndef PRODUCT
1301 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1302 tty->print("*** verify_method_signature failed: ");
1303 java_lang_invoke_MethodType::print_signature(mtype(), tty);
1304 tty->cr();
1305 tty->print_cr(" first_ptype_pos = %d, insert_ptype = "UINTX_FORMAT, first_ptype_pos, insert_ptype());
1306 tty->print(" Failing method: ");
1307 m->print();
1308 }
1309 #endif //PRODUCT
1310 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1311 }
1312 }
1313
1314 // Main routine for verifying the MethodHandle.type of a proposed
1315 // direct or bound-direct method handle.
1316 void MethodHandles::verify_method_type(methodHandle m,
1317 Handle mtype,
1318 bool has_bound_recv,
1319 KlassHandle bound_recv_type,
1320 TRAPS) {
1321 bool m_needs_receiver = !m->is_static();
1322
1323 const char* err = NULL;
1324
1325 int first_ptype_pos = m_needs_receiver ? 1 : 0;
1326 if (has_bound_recv) {
1327 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them
1328 if (m_needs_receiver && bound_recv_type.is_null())
1329 { err = "bound receiver is not an object"; goto die; }
1330 }
1331
1332 if (m_needs_receiver && err == NULL) {
1333 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype());
1334 if (ptypes->length() < first_ptype_pos)
1335 { err = "receiver argument is missing"; goto die; }
1336 if (has_bound_recv)
1337 err = check_method_receiver(m(), bound_recv_type->as_klassOop());
1338 else
1339 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1)));
1340 if (err != NULL) goto die;
1341 }
1342
1343 // Check the other arguments for mistypes.
1344 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK);
1345 return;
1346
1347 die:
1348 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1349 }
1350
1351 void MethodHandles::verify_vmslots(Handle mh, TRAPS) {
1352 // Verify vmslots.
1353 int check_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(mh()));
1354 if (java_lang_invoke_MethodHandle::vmslots(mh()) != check_slots) {
1355 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH");
1356 }
1357 }
1358
1359 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) {
1360 // Verify that argslot points at the given argnum.
1361 int check_slot = argument_slot(java_lang_invoke_MethodHandle::type(mh()), argnum);
1362 if (argslot != check_slot || argslot < 0) {
1363 ResourceMark rm;
1364 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d";
1365 size_t msglen = strlen(fmt) + 3*11 + 1;
1366 char* msg = NEW_RESOURCE_ARRAY(char, msglen);
1367 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot);
1368 THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
1369 }
1370 }
1371
1372 // Verify the correspondence between two method types.
1373 // Apart from the advertised changes, caller method type X must
1374 // be able to invoke the callee method Y type with no violations
1375 // of type integrity.
1376 // Return NULL if all is well, else a short error message.
1377 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end,
1378 int insert_argnum, oop insert_type,
1379 int change_argnum, oop change_type,
1380 int delete_argnum,
1381 oop dst_mtype, int dst_beg, int dst_end,
1382 bool raw) {
1383 objArrayOop src_ptypes = java_lang_invoke_MethodType::ptypes(src_mtype);
1384 objArrayOop dst_ptypes = java_lang_invoke_MethodType::ptypes(dst_mtype);
1385
1386 int src_max = src_ptypes->length();
1387 int dst_max = dst_ptypes->length();
1388
1389 if (src_end == -1) src_end = src_max;
1390 if (dst_end == -1) dst_end = dst_max;
1391
1392 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob");
1393 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob");
1394
1395 // pending actions; set to -1 when done:
1396 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum;
1397
1398 const char* err = NULL;
1399
1400 // Walk along each array of parameter types, including a virtual
1401 // NULL end marker at the end of each.
1402 for (int src_idx = src_beg, dst_idx = dst_beg;
1403 (src_idx <= src_end && dst_idx <= dst_end);
1404 src_idx++, dst_idx++) {
1405 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx);
1406 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx);
1407 bool fix_null_src_type = false;
1408
1409 // Perform requested edits.
1410 if (ins_idx == src_idx) {
1411 // note that the inserted guy is never affected by a change or deletion
1412 ins_idx = -1;
1413 src_type = insert_type;
1414 fix_null_src_type = true;
1415 --src_idx; // back up to process src type on next loop
1416 src_idx = src_end;
1417 } else {
1418 // note that the changed guy can be immediately deleted
1419 if (chg_idx == src_idx) {
1420 chg_idx = -1;
1421 assert(src_idx < src_end, "oob");
1422 src_type = change_type;
1423 fix_null_src_type = true;
1424 }
1425 if (del_idx == src_idx) {
1426 del_idx = -1;
1427 assert(src_idx < src_end, "oob");
1428 --dst_idx;
1429 continue; // rerun loop after skipping this position
1430 }
1431 }
1432
1433 if (src_type == NULL && fix_null_src_type)
1434 // explicit null in this case matches any dest reference
1435 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type);
1436
1437 // Compare the two argument types.
1438 if (src_type != dst_type) {
1439 if (src_type == NULL) return "not enough arguments";
1440 if (dst_type == NULL) return "too many arguments";
1441 err = check_argument_type_change(src_type, dst_type, dst_idx, raw);
1442 if (err != NULL) return err;
1443 }
1444 }
1445
1446 // Now compare return types also.
1447 oop src_rtype = java_lang_invoke_MethodType::rtype(src_mtype);
1448 oop dst_rtype = java_lang_invoke_MethodType::rtype(dst_mtype);
1449 if (src_rtype != dst_rtype) {
1450 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal!
1451 if (err != NULL) return err;
1452 }
1453
1454 assert(err == NULL, "");
1455 return NULL; // all is well
1456 }
1457
1458
1459 const char* MethodHandles::check_argument_type_change(BasicType src_type,
1460 klassOop src_klass,
1461 BasicType dst_type,
1462 klassOop dst_klass,
1463 int argnum,
1464 bool raw) {
1465 const char* err = NULL;
1466 const bool for_return = (argnum < 0);
1467
1468 // just in case:
1469 if (src_type == T_ARRAY) src_type = T_OBJECT;
1470 if (dst_type == T_ARRAY) dst_type = T_OBJECT;
1471
1472 // Produce some nice messages if VerifyMethodHandles is turned on:
1473 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) {
1474 if (src_type == T_OBJECT) {
1475 if (raw && is_java_primitive(dst_type))
1476 return NULL; // ref-to-prim discards ref and returns zero
1477 err = (!for_return
1478 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s"
1479 : "type mismatch: returning a %s, but caller expects primitive %s");
1480 } else if (dst_type == T_OBJECT) {
1481 err = (!for_return
1482 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s"
1483 : "type mismatch: returning a primitive %s, but caller expects %s");
1484 } else {
1485 err = (!for_return
1486 ? "type mismatch: passing a %s for method argument #%d, which expects %s"
1487 : "type mismatch: returning a %s, but caller expects %s");
1488 }
1489 } else if (src_type == T_OBJECT && dst_type == T_OBJECT &&
1490 class_cast_needed(src_klass, dst_klass)) {
1491 if (!class_cast_needed(dst_klass, src_klass)) {
1492 if (raw)
1493 return NULL; // reverse cast is OK; the MH target is trusted to enforce it
1494 err = (!for_return
1495 ? "cast required: passing a %s for method argument #%d, which expects %s"
1496 : "cast required: returning a %s, but caller expects %s");
1497 } else {
1498 err = (!for_return
1499 ? "reference mismatch: passing a %s for method argument #%d, which expects %s"
1500 : "reference mismatch: returning a %s, but caller expects %s");
1501 }
1502 } else {
1503 // passed the obstacle course
1504 return NULL;
1505 }
1506
1507 // format, format, format
1508 const char* src_name = type2name(src_type);
1509 const char* dst_name = type2name(dst_type);
1510 if (src_name == NULL) src_name = "unknown type";
1511 if (dst_name == NULL) dst_name = "unknown type";
1512 if (src_type == T_OBJECT)
1513 src_name = (src_klass != NULL) ? Klass::cast(src_klass)->external_name() : "an unresolved class";
1514 if (dst_type == T_OBJECT)
1515 dst_name = (dst_klass != NULL) ? Klass::cast(dst_klass)->external_name() : "an unresolved class";
1516
1517 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11);
1518 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1);
1519 if (!for_return) {
1520 assert(strstr(err, "%d") != NULL, "");
1521 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name);
1522 } else {
1523 assert(strstr(err, "%d") == NULL, "");
1524 jio_snprintf(msg, msglen, err, src_name, dst_name);
1525 }
1526 return msg;
1527 }
1528
1529 // Compute the depth within the stack of the given argument, i.e.,
1530 // the combined size of arguments to the right of the given argument.
1531 // For the last argument (ptypes.length-1) this will be zero.
1532 // For the first argument (0) this will be the size of all
1533 // arguments but that one. For the special number -1, this
1534 // will be the size of all arguments, including the first.
1535 // If the argument is neither -1 nor a valid argument index,
1536 // then return a negative number. Otherwise, the result
1537 // is in the range [0..vmslots] inclusive.
1538 int MethodHandles::argument_slot(oop method_type, int arg) {
1539 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type);
1540 int argslot = 0;
1541 int len = ptypes->length();
1542 if (arg < -1 || arg >= len) return -99;
1543 for (int i = len-1; i > arg; i--) {
1544 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1545 argslot += type2size[bt];
1546 }
1547 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works");
1548 return argslot;
1549 }
1550
1551 // Given a slot number, return the argument number.
1552 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) {
1553 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type);
1554 int argslot = 0;
1555 int len = ptypes->length();
1556 for (int i = len-1; i >= 0; i--) {
1557 if (query_argslot == argslot) return i;
1558 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1559 argslot += type2size[bt];
1560 }
1561 // return pseudo-arg deepest in stack:
1562 if (query_argslot == argslot) return -1;
1563 return -99; // oob slot, or splitting a double-slot arg
1564 }
1565
1566 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m,
1567 KlassHandle receiver_limit,
1568 int decode_flags,
1569 KlassHandle receiver_klass,
1570 TRAPS) {
1571 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference");
1572 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument");
1573
1574 if (!m->is_static() &&
1575 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder())))
1576 // given type does not match class of method, or receiver is null!
1577 // caller should have checked this, but let's be extra careful...
1578 return methodHandle();
1579
1580 if (receiver_limit.not_null() &&
1581 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit())))
1582 // given type is not limited to the receiver type
1583 // note that a null receiver can match any reference value, for a static method
1584 return methodHandle();
1585
1586 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) {
1587 // pre-dispatched or static method (null receiver is OK for static)
1588 return m;
1589
1590 } else if (receiver_klass.is_null()) {
1591 // null receiver value; cannot dispatch
1592 return methodHandle();
1593
1594 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) {
1595 // perform virtual dispatch
1596 int vtable_index = m->vtable_index();
1597 guarantee(vtable_index >= 0, "valid vtable index");
1598
1599 // receiver_klass might be an arrayKlassOop but all vtables start at
1600 // the same place. The cast is to avoid virtual call and assertion.
1601 // See also LinkResolver::runtime_resolve_virtual_method.
1602 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass());
1603 DEBUG_ONLY(inst->verify_vtable_index(vtable_index));
1604 methodOop m_oop = inst->method_at_vtable(vtable_index);
1605 return methodHandle(THREAD, m_oop);
1606
1607 } else {
1608 // perform interface dispatch
1609 int itable_index = klassItable::compute_itable_index(m());
1610 guarantee(itable_index >= 0, "valid itable index");
1611 instanceKlass* inst = instanceKlass::cast(receiver_klass());
1612 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD);
1613 return methodHandle(THREAD, m_oop);
1614 }
1615 }
1616
1617 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) {
1618 // Verify type.
1619 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1620 verify_method_type(m, mtype, false, KlassHandle(), CHECK);
1621
1622 // Verify vmslots.
1623 if (java_lang_invoke_MethodHandle::vmslots(mh()) != m->size_of_parameters()) {
1624 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH");
1625 }
1626 }
1627
1628 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) {
1629 // Check arguments.
1630 if (mh.is_null() || m.is_null() ||
1631 (!do_dispatch && m->is_abstract())) {
1632 THROW(vmSymbols::java_lang_InternalError());
1633 }
1634
1635 java_lang_invoke_MethodHandle::init_vmslots(mh());
1636
1637 if (VerifyMethodHandles) {
1638 // The privileged code which invokes this routine should not make
1639 // a mistake about types, but it's better to verify.
1640 verify_DirectMethodHandle(mh, m, CHECK);
1641 }
1642
1643 // Finally, after safety checks are done, link to the target method.
1644 // We will follow the same path as the latter part of
1645 // InterpreterRuntime::resolve_invoke(), which first finds the method
1646 // and then decides how to populate the constant pool cache entry
1647 // that links the interpreter calls to the method. We need the same
1648 // bits, and will use the same calling sequence code.
1649
1650 int vmindex = methodOopDesc::garbage_vtable_index;
1651 Handle vmtarget;
1652
1653 instanceKlass::cast(m->method_holder())->link_class(CHECK);
1654
1655 MethodHandleEntry* me = NULL;
1656 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) {
1657 // We are simulating an invokeinterface instruction.
1658 // (We might also be simulating an invokevirtual on a miranda method,
1659 // but it is safe to treat it as an invokeinterface.)
1660 assert(!m->can_be_statically_bound(), "no final methods on interfaces");
1661 vmindex = klassItable::compute_itable_index(m());
1662 assert(vmindex >= 0, "(>=0) == do_dispatch");
1663 // Set up same bits as ConstantPoolCacheEntry::set_interface_call().
1664 vmtarget = m->method_holder(); // the interface
1665 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh);
1666 } else if (!do_dispatch || m->can_be_statically_bound()) {
1667 // We are simulating an invokestatic or invokespecial instruction.
1668 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method().
1669 vmtarget = m;
1670 // this does not help dispatch, but it will make it possible to parse this MH:
1671 vmindex = methodOopDesc::nonvirtual_vtable_index;
1672 assert(vmindex < 0, "(>=0) == do_dispatch");
1673 if (!m->is_static()) {
1674 me = MethodHandles::entry(MethodHandles::_invokespecial_mh);
1675 } else {
1676 me = MethodHandles::entry(MethodHandles::_invokestatic_mh);
1677 // Part of the semantics of a static call is an initialization barrier.
1678 // For a DMH, it is done now, when the handle is created.
1679 Klass* k = Klass::cast(m->method_holder());
1680 if (k->should_be_initialized()) {
1681 k->initialize(CHECK); // possible safepoint
1682 }
1683 }
1684 } else {
1685 // We are simulating an invokevirtual instruction.
1686 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method().
1687 // The key logic is LinkResolver::runtime_resolve_virtual_method.
1688 vmindex = m->vtable_index();
1689 vmtarget = m->method_holder();
1690 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh);
1691 }
1692
1693 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
1694
1695 java_lang_invoke_DirectMethodHandle::set_vmtarget(mh(), vmtarget());
1696 java_lang_invoke_DirectMethodHandle::set_vmindex( mh(), vmindex);
1697 DEBUG_ONLY(KlassHandle rlimit; int flags);
1698 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m,
1699 "properly stored for later decoding");
1700 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0));
1701 assert(!(actual_do_dispatch && !do_dispatch),
1702 "do not perform dispatch if !do_dispatch specified");
1703 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch");
1704 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack");
1705
1706 // Done!
1707 java_lang_invoke_MethodHandle::set_vmentry(mh(), me);
1708 }
1709
1710 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh,
1711 methodHandle m,
1712 TRAPS) {
1713 // Verify type.
1714 KlassHandle bound_recv_type;
1715 {
1716 oop receiver = java_lang_invoke_BoundMethodHandle::argument(mh());
1717 if (receiver != NULL)
1718 bound_recv_type = KlassHandle(THREAD, receiver->klass());
1719 }
1720 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1721 verify_method_type(m, mtype, true, bound_recv_type, CHECK);
1722
1723 int receiver_pos = m->size_of_parameters() - 1;
1724
1725 // Verify MH.vmargslot, which should point at the bound receiver.
1726 verify_vmargslot(mh, -1, java_lang_invoke_BoundMethodHandle::vmargslot(mh()), CHECK);
1727 //verify_vmslots(mh, CHECK);
1728
1729 // Verify vmslots.
1730 if (java_lang_invoke_MethodHandle::vmslots(mh()) != receiver_pos) {
1731 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)");
1732 }
1733 }
1734
1735 // Initialize a BMH with a receiver bound directly to a methodOop.
1736 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh,
1737 methodHandle original_m,
1738 KlassHandle receiver_limit,
1739 int decode_flags,
1740 TRAPS) {
1741 // Check arguments.
1742 if (mh.is_null() || original_m.is_null()) {
1743 THROW(vmSymbols::java_lang_InternalError());
1744 }
1745
1746 KlassHandle receiver_klass;
1747 {
1748 oop receiver_oop = java_lang_invoke_BoundMethodHandle::argument(mh());
1749 if (receiver_oop != NULL)
1750 receiver_klass = KlassHandle(THREAD, receiver_oop->klass());
1751 }
1752 methodHandle m = dispatch_decoded_method(original_m,
1753 receiver_limit, decode_flags,
1754 receiver_klass,
1755 CHECK);
1756 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); }
1757 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); }
1758
1759 java_lang_invoke_MethodHandle::init_vmslots(mh());
1760 int vmargslot = m->size_of_parameters() - 1;
1761 assert(java_lang_invoke_BoundMethodHandle::vmargslot(mh()) == vmargslot, "");
1762
1763 if (VerifyMethodHandles) {
1764 verify_BoundMethodHandle_with_receiver(mh, m, CHECK);
1765 }
1766
1767 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m());
1768
1769 DEBUG_ONLY(KlassHandle junk1; int junk2);
1770 assert(MethodHandles::decode_method(mh(), junk1, junk2) == m, "properly stored for later decoding");
1771 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot");
1772
1773 // Done!
1774 java_lang_invoke_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh));
1775 }
1776
1777 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
1778 bool direct_to_method, TRAPS) {
1779 ResourceMark rm;
1780 Handle ptype_handle(THREAD,
1781 java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum));
1782 KlassHandle ptype_klass;
1783 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass);
1784 int slots_pushed = type2size[ptype];
1785
1786 oop argument = java_lang_invoke_BoundMethodHandle::argument(mh());
1787
1788 const char* err = NULL;
1789
1790 switch (ptype) {
1791 case T_OBJECT:
1792 if (argument != NULL)
1793 // we must implicitly convert from the arg type to the outgoing ptype
1794 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum);
1795 break;
1796
1797 case T_ARRAY: case T_VOID:
1798 assert(false, "array, void do not appear here");
1799 default:
1800 if (ptype != T_INT && !is_subword_type(ptype)) {
1801 err = "unexpected parameter type";
1802 break;
1803 }
1804 // check subrange of Integer.value, if necessary
1805 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) {
1806 err = "bound integer argument must be of type java.lang.Integer";
1807 break;
1808 }
1809 if (ptype != T_INT) {
1810 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
1811 jint value = argument->int_field(value_offset);
1812 int vminfo = adapter_unbox_subword_vminfo(ptype);
1813 jint subword = truncate_subword_from_vminfo(value, vminfo);
1814 if (value != subword) {
1815 err = "bound subword value does not fit into the subword type";
1816 break;
1817 }
1818 }
1819 break;
1820 case T_FLOAT:
1821 case T_DOUBLE:
1822 case T_LONG:
1823 {
1824 // we must implicitly convert from the unboxed arg type to the outgoing ptype
1825 BasicType argbox = java_lang_boxing_object::basic_type(argument);
1826 if (argbox != ptype) {
1827 err = check_argument_type_change(T_OBJECT, (argument == NULL
1828 ? SystemDictionary::Object_klass()
1829 : argument->klass()),
1830 ptype, ptype_klass(), argnum);
1831 assert(err != NULL, "this must be an error");
1832 }
1833 break;
1834 }
1835 }
1836
1837 if (err == NULL) {
1838 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1839 if (direct_to_method) {
1840 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots");
1841 } else {
1842 int target_pushes = decode_MethodHandle_stack_pushes(target());
1843 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct");
1844 }
1845 }
1846
1847 if (err == NULL) {
1848 // Verify the rest of the method type.
1849 err = check_method_type_insertion(java_lang_invoke_MethodHandle::type(mh()),
1850 argnum, ptype_handle(),
1851 java_lang_invoke_MethodHandle::type(target()));
1852 }
1853
1854 if (err != NULL) {
1855 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1856 }
1857 }
1858
1859 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
1860 // Check arguments.
1861 if (mh.is_null() || target.is_null() || !java_lang_invoke_MethodHandle::is_instance(target())) {
1862 THROW(vmSymbols::java_lang_InternalError());
1863 }
1864
1865 java_lang_invoke_MethodHandle::init_vmslots(mh());
1866 int argslot = java_lang_invoke_BoundMethodHandle::vmargslot(mh());
1867
1868 if (VerifyMethodHandles) {
1869 int insert_after = argnum - 1;
1870 verify_vmargslot(mh, insert_after, argslot, CHECK);
1871 verify_vmslots(mh, CHECK);
1872 }
1873
1874 // Get bound type and required slots.
1875 BasicType ptype;
1876 {
1877 oop ptype_oop = java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum);
1878 ptype = java_lang_Class::as_BasicType(ptype_oop);
1879 }
1880 int slots_pushed = type2size[ptype];
1881
1882 // If (a) the target is a direct non-dispatched method handle,
1883 // or (b) the target is a dispatched direct method handle and we
1884 // are binding the receiver, cut out the middle-man.
1885 // Do this by decoding the DMH and using its methodOop directly as vmtarget.
1886 bool direct_to_method = false;
1887 if (OptimizeMethodHandles &&
1888 target->klass() == SystemDictionary::DirectMethodHandle_klass() &&
1889 (argnum != 0 || java_lang_invoke_BoundMethodHandle::argument(mh()) != NULL) &&
1890 (argnum == 0 || java_lang_invoke_DirectMethodHandle::vmindex(target()) < 0)) {
1891 KlassHandle receiver_limit; int decode_flags = 0;
1892 methodHandle m = decode_method(target(), receiver_limit, decode_flags);
1893 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); }
1894 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg.
1895 assert(java_lang_invoke_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig");
1896 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) {
1897 init_BoundMethodHandle_with_receiver(mh, m,
1898 receiver_limit, decode_flags,
1899 CHECK);
1900 return;
1901 }
1902
1903 // Even if it is not a bound receiver, we still might be able
1904 // to bind another argument and still invoke the methodOop directly.
1905 if (!(decode_flags & _dmf_does_dispatch)) {
1906 direct_to_method = true;
1907 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m());
1908 }
1909 }
1910 if (!direct_to_method)
1911 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), target());
1912
1913 if (VerifyMethodHandles) {
1914 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK);
1915 }
1916
1917 // Next question: Is this a ref, int, or long bound value?
1918 MethodHandleEntry* me = NULL;
1919 if (ptype == T_OBJECT) {
1920 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh);
1921 else me = MethodHandles::entry(_bound_ref_mh);
1922 } else if (slots_pushed == 2) {
1923 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh);
1924 else me = MethodHandles::entry(_bound_long_mh);
1925 } else if (slots_pushed == 1) {
1926 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh);
1927 else me = MethodHandles::entry(_bound_int_mh);
1928 } else {
1929 assert(false, "");
1930 }
1931
1932 // Done!
1933 java_lang_invoke_MethodHandle::set_vmentry(mh(), me);
1934 }
1935
1936 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) {
1937 char msg[200];
1938 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err);
1939 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg);
1940 }
1941
1942 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) {
1943 ResourceMark rm;
1944 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
1945 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
1946
1947 verify_vmargslot(mh, argnum, argslot, CHECK);
1948 verify_vmslots(mh, CHECK);
1949
1950 jint conv_op = adapter_conversion_op(conversion);
1951 if (!conv_op_valid(conv_op)) {
1952 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD);
1953 return;
1954 }
1955 EntryKind ek = adapter_entry_kind(conv_op);
1956
1957 int stack_move = adapter_conversion_stack_move(conversion);
1958 BasicType src = adapter_conversion_src_type(conversion);
1959 BasicType dest = adapter_conversion_dest_type(conversion);
1960 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
1961
1962 Handle argument(THREAD, java_lang_invoke_AdapterMethodHandle::argument(mh()));
1963 Handle target(THREAD, java_lang_invoke_AdapterMethodHandle::vmtarget(mh()));
1964 Handle src_mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1965 Handle dst_mtype(THREAD, java_lang_invoke_MethodHandle::type(target()));
1966 Handle arg_mtype;
1967
1968 const char* err = NULL;
1969
1970 if (err == NULL) {
1971 // Check that the correct argument is supplied, but only if it is required.
1972 switch (ek) {
1973 case _adapter_check_cast: // target type of cast
1974 case _adapter_ref_to_prim: // wrapper type from which to unbox
1975 case _adapter_spread_args: // array type to spread from
1976 if (!java_lang_Class::is_instance(argument())
1977 || java_lang_Class::is_primitive(argument()))
1978 { err = "adapter requires argument of type java.lang.Class"; break; }
1979 if (ek == _adapter_spread_args) {
1980 // Make sure it is a suitable collection type. (Array, for now.)
1981 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument()));
1982 if (!ak->oop_is_array())
1983 { err = "spread adapter requires argument representing an array class"; break; }
1984 BasicType et = arrayKlass::cast(ak->as_klassOop())->element_type();
1985 if (et != dest && stack_move <= 0)
1986 { err = "spread adapter requires array class argument of correct type"; break; }
1987 }
1988 break;
1989 case _adapter_prim_to_ref: // boxer MH to use
1990 case _adapter_collect_args: // method handle which collects the args
1991 case _adapter_fold_args: // method handle which collects the args
1992 if (!UseRicochetFrames) {
1993 { err = "box/collect/fold operators are not supported"; break; }
1994 }
1995 if (!java_lang_invoke_MethodHandle::is_instance(argument()))
1996 { err = "MethodHandle adapter argument required"; break; }
1997 arg_mtype = Handle(THREAD, java_lang_invoke_MethodHandle::type(argument()));
1998 break;
1999 default:
2000 if (argument.not_null())
2001 { err = "adapter has spurious argument"; break; }
2002 break;
2003 }
2004 }
2005
2006 if (err == NULL) {
2007 // Check that the src/dest types are supplied if needed.
2008 // Also check relevant parameter or return types.
2009 switch (ek) {
2010 case _adapter_check_cast:
2011 if (src != T_OBJECT || dest != T_OBJECT) {
2012 err = "adapter requires object src/dest conversion subfields";
2013 }
2014 break;
2015 case _adapter_prim_to_prim:
2016 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) {
2017 err = "adapter requires primitive src/dest conversion subfields"; break;
2018 }
2019 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) ||
2020 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) {
2021 err = "adapter cannot convert beween floating and fixed-point"; break;
2022 }
2023 break;
2024 case _adapter_ref_to_prim:
2025 if (src != T_OBJECT || !is_java_primitive(dest)
2026 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) {
2027 err = "adapter requires primitive dest conversion subfield"; break;
2028 }
2029 break;
2030 case _adapter_prim_to_ref:
2031 if (!is_java_primitive(src) || dest != T_OBJECT) {
2032 err = "adapter requires primitive src conversion subfield"; break;
2033 }
2034 break;
2035 case _adapter_swap_args:
2036 {
2037 if (!src || !dest) {
2038 err = "adapter requires src/dest conversion subfields for swap"; break;
2039 }
2040 int src_size = type2size[src];
2041 if (src_size != type2size[dest]) {
2042 err = "adapter requires equal sizes for src/dest"; break;
2043 }
2044 int src_slot = argslot;
2045 int dest_slot = vminfo;
2046 int src_arg = argnum;
2047 int dest_arg = argument_slot_to_argnum(src_mtype(), dest_slot);
2048 verify_vmargslot(mh, dest_arg, dest_slot, CHECK);
2049 if (!(dest_slot >= src_slot + src_size) &&
2050 !(src_slot >= dest_slot + src_size)) {
2051 err = "source, destination slots must be distinct"; break;
2052 } else if (!(src_slot > dest_slot)) {
2053 err = "source of swap must be deeper in stack"; break;
2054 }
2055 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), dest_arg),
2056 java_lang_invoke_MethodType::ptype(dst_mtype(), src_arg),
2057 dest_arg);
2058 if (err == NULL)
2059 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), src_arg),
2060 java_lang_invoke_MethodType::ptype(dst_mtype(), dest_arg),
2061 src_arg);
2062 break;
2063 }
2064 case _adapter_rot_args:
2065 {
2066 if (!src || !dest) {
2067 err = "adapter requires src/dest conversion subfields for rotate"; break;
2068 }
2069 int src_slot = argslot;
2070 int limit_raw = vminfo;
2071 bool rot_down = (src_slot < limit_raw);
2072 int limit_bias = (rot_down ? MethodHandles::OP_ROT_ARGS_DOWN_LIMIT_BIAS : 0);
2073 int limit_slot = limit_raw - limit_bias;
2074 int src_arg = argnum;
2075 int limit_arg = argument_slot_to_argnum(src_mtype(), limit_slot);
2076 verify_vmargslot(mh, limit_arg, limit_slot, CHECK);
2077 if (src_slot == limit_slot) {
2078 err = "source, destination slots must be distinct"; break;
2079 }
2080 if (!rot_down) { // rotate slots up == shift arguments left
2081 // limit_slot is an inclusive lower limit
2082 assert((src_slot > limit_slot) && (src_arg < limit_arg), "");
2083 // rotate up: [limit_slot..src_slot-ss] --> [limit_slot+ss..src_slot]
2084 // that is: [src_arg+1..limit_arg] --> [src_arg..limit_arg-1]
2085 for (int i = src_arg+1; i <= limit_arg && err == NULL; i++) {
2086 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), i),
2087 java_lang_invoke_MethodType::ptype(dst_mtype(), i-1),
2088 i);
2089 }
2090 } else { // rotate slots down == shfit arguments right
2091 // limit_slot is an exclusive upper limit
2092 assert((src_slot < limit_slot - limit_bias) && (src_arg > limit_arg + limit_bias), "");
2093 // rotate down: [src_slot+ss..limit_slot) --> [src_slot..limit_slot-ss)
2094 // that is: (limit_arg..src_arg-1] --> (dst_arg+1..src_arg]
2095 for (int i = limit_arg+1; i <= src_arg-1 && err == NULL; i++) {
2096 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), i),
2097 java_lang_invoke_MethodType::ptype(dst_mtype(), i+1),
2098 i);
2099 }
2100 }
2101 if (err == NULL) {
2102 int dest_arg = (rot_down ? limit_arg+1 : limit_arg);
2103 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), src_arg),
2104 java_lang_invoke_MethodType::ptype(dst_mtype(), dest_arg),
2105 src_arg);
2106 }
2107 }
2108 break;
2109 case _adapter_spread_args:
2110 case _adapter_collect_args:
2111 case _adapter_fold_args:
2112 {
2113 bool is_spread = (ek == _adapter_spread_args);
2114 bool is_fold = (ek == _adapter_fold_args);
2115 BasicType coll_type = is_spread ? src : dest;
2116 BasicType elem_type = is_spread ? dest : src;
2117 // coll_type is type of args in collected form (or T_VOID if none)
2118 // elem_type is common type of args in spread form (or T_VOID if missing or heterogeneous)
2119 if (coll_type == 0 || elem_type == 0) {
2120 err = "adapter requires src/dest subfields for spread or collect"; break;
2121 }
2122 if (is_spread && coll_type != T_OBJECT) {
2123 err = "spread adapter requires object type for argument bundle"; break;
2124 }
2125 Handle spread_mtype = (is_spread ? dst_mtype : src_mtype);
2126 int spread_slot = argslot;
2127 int spread_arg = argnum;
2128 int slots_pushed = stack_move / stack_move_unit();
2129 int coll_slot_count = type2size[coll_type];
2130 int spread_slot_count = (is_spread ? slots_pushed : -slots_pushed) + coll_slot_count;
2131 if (is_fold) spread_slot_count = argument_slot_count(arg_mtype());
2132 if (!is_spread) {
2133 int init_slots = argument_slot_count(src_mtype());
2134 int coll_slots = argument_slot_count(arg_mtype());
2135 if (spread_slot_count > init_slots ||
2136 spread_slot_count != coll_slots) {
2137 err = "collect adapter has inconsistent arg counts"; break;
2138 }
2139 int next_slots = argument_slot_count(dst_mtype());
2140 int unchanged_slots_in = (init_slots - spread_slot_count);
2141 int unchanged_slots_out = (next_slots - coll_slot_count - (is_fold ? spread_slot_count : 0));
2142 if (unchanged_slots_in != unchanged_slots_out) {
2143 err = "collect adapter continuation has inconsistent arg counts"; break;
2144 }
2145 }
2146 }
2147 break;
2148 default:
2149 if (src != 0 || dest != 0) {
2150 err = "adapter has spurious src/dest conversion subfields"; break;
2151 }
2152 break;
2153 }
2154 }
2155
2156 if (err == NULL) {
2157 // Check the stack_move subfield.
2158 // It must always report the net change in stack size, positive or negative.
2159 int slots_pushed = stack_move / stack_move_unit();
2160 switch (ek) {
2161 case _adapter_prim_to_prim:
2162 case _adapter_ref_to_prim:
2163 case _adapter_prim_to_ref:
2164 if (slots_pushed != type2size[dest] - type2size[src]) {
2165 err = "wrong stack motion for primitive conversion";
2166 }
2167 break;
2168 case _adapter_dup_args:
2169 if (slots_pushed <= 0) {
2170 err = "adapter requires conversion subfield slots_pushed > 0";
2171 }
2172 break;
2173 case _adapter_drop_args:
2174 if (slots_pushed >= 0) {
2175 err = "adapter requires conversion subfield slots_pushed < 0";
2176 }
2177 break;
2178 case _adapter_collect_args:
2179 case _adapter_fold_args:
2180 if (slots_pushed > 2) {
2181 err = "adapter requires conversion subfield slots_pushed <= 2";
2182 }
2183 break;
2184 case _adapter_spread_args:
2185 if (slots_pushed < -1) {
2186 err = "adapter requires conversion subfield slots_pushed >= -1";
2187 }
2188 break;
2189 default:
2190 if (stack_move != 0) {
2191 err = "adapter has spurious stack_move conversion subfield";
2192 }
2193 break;
2194 }
2195 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) {
2196 err = "stack_move conversion subfield must be multiple of stack_move_unit";
2197 }
2198 }
2199
2200 if (err == NULL) {
2201 // Make sure this adapter's stack pushing is accurately recorded.
2202 int slots_pushed = stack_move / stack_move_unit();
2203 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh());
2204 int target_vmslots = java_lang_invoke_MethodHandle::vmslots(target());
2205 int target_pushes = decode_MethodHandle_stack_pushes(target());
2206 if (slots_pushed != (target_vmslots - this_vmslots)) {
2207 err = "stack_move inconsistent with previous and current MethodType vmslots";
2208 } else {
2209 int this_pushes = decode_MethodHandle_stack_pushes(mh());
2210 if (slots_pushed + target_pushes != this_pushes) {
2211 if (this_pushes == 0)
2212 err = "adapter push count not initialized";
2213 else
2214 err = "adapter push count is wrong";
2215 }
2216 }
2217
2218 // While we're at it, check that the stack motion decoder works:
2219 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
2220 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct");
2221 }
2222
2223 if (err == NULL && vminfo != 0) {
2224 switch (ek) {
2225 case _adapter_swap_args:
2226 case _adapter_rot_args:
2227 case _adapter_prim_to_ref:
2228 case _adapter_collect_args:
2229 case _adapter_fold_args:
2230 break; // OK
2231 default:
2232 err = "vminfo subfield is reserved to the JVM";
2233 }
2234 }
2235
2236 // Do additional ad hoc checks.
2237 if (err == NULL) {
2238 switch (ek) {
2239 case _adapter_retype_only:
2240 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false);
2241 break;
2242
2243 case _adapter_retype_raw:
2244 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true);
2245 break;
2246
2247 case _adapter_check_cast:
2248 {
2249 // The actual value being checked must be a reference:
2250 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), argnum),
2251 object_java_mirror(), argnum);
2252 if (err != NULL) break;
2253
2254 // The output of the cast must fit with the destination argument:
2255 Handle cast_class = argument;
2256 err = check_method_type_conversion(src_mtype(),
2257 argnum, cast_class(),
2258 dst_mtype());
2259 }
2260 break;
2261
2262 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles
2263 }
2264 }
2265
2266 if (err != NULL) {
2267 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
2268 return;
2269 }
2270
2271 }
2272
2273 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
2274 Handle argument = java_lang_invoke_AdapterMethodHandle::argument(mh());
2275 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
2276 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
2277 jint conv_op = adapter_conversion_op(conversion);
2278
2279 // adjust the adapter code to the internal EntryKind enumeration:
2280 EntryKind ek_orig = adapter_entry_kind(conv_op);
2281 EntryKind ek_opt = ek_orig; // may be optimized
2282 EntryKind ek_try; // temp
2283
2284 // Finalize the vmtarget field (Java initialized it to null).
2285 if (!java_lang_invoke_MethodHandle::is_instance(target())) {
2286 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD);
2287 return;
2288 }
2289 java_lang_invoke_AdapterMethodHandle::set_vmtarget(mh(), target());
2290
2291 int stack_move = adapter_conversion_stack_move(conversion);
2292 BasicType src = adapter_conversion_src_type(conversion);
2293 BasicType dest = adapter_conversion_dest_type(conversion);
2294 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
2295
2296 int slots_pushed = stack_move / stack_move_unit();
2297
2298 if (VerifyMethodHandles) {
2299 verify_AdapterMethodHandle(mh, argnum, CHECK);
2300 }
2301
2302 const char* err = NULL;
2303
2304 if (!conv_op_supported(conv_op)) {
2305 err = "adapter not yet implemented in the JVM";
2306 }
2307
2308 // Now it's time to finish the case analysis and pick a MethodHandleEntry.
2309 switch (ek_orig) {
2310 case _adapter_retype_only:
2311 case _adapter_retype_raw:
2312 case _adapter_check_cast:
2313 case _adapter_dup_args:
2314 case _adapter_drop_args:
2315 // these work fine via general case code
2316 break;
2317
2318 case _adapter_prim_to_prim:
2319 {
2320 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}.
2321 // And, the {float,double} -> {int,long} cases must be handled by Java.
2322 switch (type2size[src] *4+ type2size[dest]) {
2323 case 1 *4+ 1:
2324 assert(src == T_INT || is_subword_type(src), "source is not float");
2325 // Subword-related cases are int -> {boolean,byte,char,short}.
2326 ek_opt = _adapter_opt_i2i;
2327 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2328 break;
2329 case 2 *4+ 1:
2330 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) {
2331 ek_opt = _adapter_opt_l2i;
2332 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2333 } else if (src == T_DOUBLE && dest == T_FLOAT) {
2334 ek_opt = _adapter_opt_d2f;
2335 } else {
2336 goto throw_not_impl; // runs user code, hence could block
2337 }
2338 break;
2339 case 1 *4+ 2:
2340 if ((src == T_INT || is_subword_type(src)) && dest == T_LONG) {
2341 ek_opt = _adapter_opt_i2l;
2342 } else if (src == T_FLOAT && dest == T_DOUBLE) {
2343 ek_opt = _adapter_opt_f2d;
2344 } else {
2345 goto throw_not_impl; // runs user code, hence could block
2346 }
2347 break;
2348 default:
2349 goto throw_not_impl; // runs user code, hence could block
2350 break;
2351 }
2352 }
2353 break;
2354
2355 case _adapter_ref_to_prim:
2356 {
2357 switch (type2size[dest]) {
2358 case 1:
2359 ek_opt = _adapter_opt_unboxi;
2360 vminfo = adapter_unbox_subword_vminfo(dest);
2361 break;
2362 case 2:
2363 ek_opt = _adapter_opt_unboxl;
2364 break;
2365 default:
2366 goto throw_not_impl;
2367 break;
2368 }
2369 }
2370 break;
2371
2372 case _adapter_prim_to_ref:
2373 {
2374 assert(UseRicochetFrames, "else don't come here");
2375 // vminfo will be the location to insert the return value
2376 vminfo = argslot;
2377 ek_opt = _adapter_opt_collect_ref;
2378 ensure_vmlayout_field(target, CHECK);
2379 // for MethodHandleWalk:
2380 if (java_lang_invoke_AdapterMethodHandle::is_instance(argument()))
2381 ensure_vmlayout_field(argument, CHECK);
2382 if (!OptimizeMethodHandles) break;
2383 switch (type2size[src]) {
2384 case 1:
2385 ek_try = EntryKind(_adapter_opt_filter_S0_ref + argslot);
2386 if (ek_try < _adapter_opt_collect_LAST &&
2387 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2388 assert(ek_adapter_opt_collect_count(ek_try) == 1 &&
2389 ek_adapter_opt_collect_type(ek_try) == T_OBJECT, "");
2390 ek_opt = ek_try;
2391 break;
2392 }
2393 // else downgrade to variable slot:
2394 ek_opt = _adapter_opt_collect_1_ref;
2395 break;
2396 case 2:
2397 ek_try = EntryKind(_adapter_opt_collect_2_S0_ref + argslot);
2398 if (ek_try < _adapter_opt_collect_LAST &&
2399 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2400 assert(ek_adapter_opt_collect_count(ek_try) == 2 &&
2401 ek_adapter_opt_collect_type(ek_try) == T_OBJECT, "");
2402 ek_opt = ek_try;
2403 break;
2404 }
2405 // else downgrade to variable slot:
2406 ek_opt = _adapter_opt_collect_2_ref;
2407 break;
2408 default:
2409 goto throw_not_impl;
2410 break;
2411 }
2412 }
2413 break;
2414
2415 case _adapter_swap_args:
2416 case _adapter_rot_args:
2417 {
2418 int swap_slots = type2size[src];
2419 int src_slot = argslot;
2420 int dest_slot = vminfo;
2421 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1;
2422 switch (swap_slots) {
2423 case 1:
2424 ek_opt = (!rotate ? _adapter_opt_swap_1 :
2425 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down);
2426 break;
2427 case 2:
2428 ek_opt = (!rotate ? _adapter_opt_swap_2 :
2429 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down);
2430 break;
2431 default:
2432 goto throw_not_impl;
2433 break;
2434 }
2435 }
2436 break;
2437
2438 case _adapter_spread_args:
2439 {
2440 #ifdef TARGET_ARCH_NYI_6939861
2441 // ports before 6939861 supported only three kinds of spread ops
2442 if (!UseRicochetFrames) {
2443 int array_size = slots_pushed + 1;
2444 assert(array_size >= 0, "");
2445 vminfo = array_size;
2446 switch (array_size) {
2447 case 0: ek_opt = _adapter_opt_spread_0; break;
2448 case 1: ek_opt = _adapter_opt_spread_1; break;
2449 default: ek_opt = _adapter_opt_spread_more; break;
2450 }
2451 break;
2452 }
2453 #endif //TARGET_ARCH_NYI_6939861
2454 // vminfo will be the required length of the array
2455 int array_size = (slots_pushed + 1) / (type2size[dest] == 2 ? 2 : 1);
2456 vminfo = array_size;
2457 // general case
2458 switch (dest) {
2459 case T_BOOLEAN : // fall through to T_BYTE:
2460 case T_BYTE : ek_opt = _adapter_opt_spread_byte; break;
2461 case T_CHAR : ek_opt = _adapter_opt_spread_char; break;
2462 case T_SHORT : ek_opt = _adapter_opt_spread_short; break;
2463 case T_INT : ek_opt = _adapter_opt_spread_int; break;
2464 case T_LONG : ek_opt = _adapter_opt_spread_long; break;
2465 case T_FLOAT : ek_opt = _adapter_opt_spread_float; break;
2466 case T_DOUBLE : ek_opt = _adapter_opt_spread_double; break;
2467 case T_OBJECT : ek_opt = _adapter_opt_spread_ref; break;
2468 case T_VOID : if (array_size != 0) goto throw_not_impl;
2469 ek_opt = _adapter_opt_spread_ref; break;
2470 default : goto throw_not_impl;
2471 }
2472 assert(array_size == 0 || // it doesn't matter what the spreader is
2473 (ek_adapter_opt_spread_count(ek_opt) == -1 &&
2474 (ek_adapter_opt_spread_type(ek_opt) == dest ||
2475 (ek_adapter_opt_spread_type(ek_opt) == T_BYTE && dest == T_BOOLEAN))),
2476 err_msg("dest=%d ek_opt=%d", dest, ek_opt));
2477
2478 if (array_size <= 0) {
2479 // since the general case does not handle length 0, this case is required:
2480 ek_opt = _adapter_opt_spread_0;
2481 break;
2482 }
2483 if (dest == T_OBJECT) {
2484 ek_try = EntryKind(_adapter_opt_spread_1_ref - 1 + array_size);
2485 if (ek_try < _adapter_opt_spread_LAST &&
2486 ek_adapter_opt_spread_count(ek_try) == array_size) {
2487 assert(ek_adapter_opt_spread_type(ek_try) == dest, "");
2488 ek_opt = ek_try;
2489 break;
2490 }
2491 }
2492 break;
2493 }
2494 break;
2495
2496 case _adapter_collect_args:
2497 {
2498 assert(UseRicochetFrames, "else don't come here");
2499 int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument()));
2500 // vminfo will be the location to insert the return value
2501 vminfo = argslot;
2502 ensure_vmlayout_field(target, CHECK);
2503 ensure_vmlayout_field(argument, CHECK);
2504
2505 // general case:
2506 switch (dest) {
2507 default : if (!is_subword_type(dest)) goto throw_not_impl;
2508 // else fall through:
2509 case T_INT : ek_opt = _adapter_opt_collect_int; break;
2510 case T_LONG : ek_opt = _adapter_opt_collect_long; break;
2511 case T_FLOAT : ek_opt = _adapter_opt_collect_float; break;
2512 case T_DOUBLE : ek_opt = _adapter_opt_collect_double; break;
2513 case T_OBJECT : ek_opt = _adapter_opt_collect_ref; break;
2514 case T_VOID : ek_opt = _adapter_opt_collect_void; break;
2515 }
2516 assert(ek_adapter_opt_collect_slot(ek_opt) == -1 &&
2517 ek_adapter_opt_collect_count(ek_opt) == -1 &&
2518 (ek_adapter_opt_collect_type(ek_opt) == dest ||
2519 ek_adapter_opt_collect_type(ek_opt) == T_INT && is_subword_type(dest)),
2520 "");
2521
2522 if (dest == T_OBJECT && elem_slots == 1 && OptimizeMethodHandles) {
2523 // filter operation on a ref
2524 ek_try = EntryKind(_adapter_opt_filter_S0_ref + argslot);
2525 if (ek_try < _adapter_opt_collect_LAST &&
2526 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2527 assert(ek_adapter_opt_collect_count(ek_try) == elem_slots &&
2528 ek_adapter_opt_collect_type(ek_try) == dest, "");
2529 ek_opt = ek_try;
2530 break;
2531 }
2532 ek_opt = _adapter_opt_collect_1_ref;
2533 break;
2534 }
2535
2536 if (dest == T_OBJECT && elem_slots == 2 && OptimizeMethodHandles) {
2537 // filter of two arguments
2538 ek_try = EntryKind(_adapter_opt_collect_2_S0_ref + argslot);
2539 if (ek_try < _adapter_opt_collect_LAST &&
2540 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2541 assert(ek_adapter_opt_collect_count(ek_try) == elem_slots &&
2542 ek_adapter_opt_collect_type(ek_try) == dest, "");
2543 ek_opt = ek_try;
2544 break;
2545 }
2546 ek_opt = _adapter_opt_collect_2_ref;
2547 break;
2548 }
2549
2550 if (dest == T_OBJECT && OptimizeMethodHandles) {
2551 // try to use a fixed length adapter
2552 ek_try = EntryKind(_adapter_opt_collect_0_ref + elem_slots);
2553 if (ek_try < _adapter_opt_collect_LAST &&
2554 ek_adapter_opt_collect_count(ek_try) == elem_slots) {
2555 assert(ek_adapter_opt_collect_slot(ek_try) == -1 &&
2556 ek_adapter_opt_collect_type(ek_try) == dest, "");
2557 ek_opt = ek_try;
2558 break;
2559 }
2560 }
2561
2562 break;
2563 }
2564
2565 case _adapter_fold_args:
2566 {
2567 assert(UseRicochetFrames, "else don't come here");
2568 int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument()));
2569 // vminfo will be the location to insert the return value
2570 vminfo = argslot + elem_slots;
2571 ensure_vmlayout_field(target, CHECK);
2572 ensure_vmlayout_field(argument, CHECK);
2573
2574 switch (dest) {
2575 default : if (!is_subword_type(dest)) goto throw_not_impl;
2576 // else fall through:
2577 case T_INT : ek_opt = _adapter_opt_fold_int; break;
2578 case T_LONG : ek_opt = _adapter_opt_fold_long; break;
2579 case T_FLOAT : ek_opt = _adapter_opt_fold_float; break;
2580 case T_DOUBLE : ek_opt = _adapter_opt_fold_double; break;
2581 case T_OBJECT : ek_opt = _adapter_opt_fold_ref; break;
2582 case T_VOID : ek_opt = _adapter_opt_fold_void; break;
2583 }
2584 assert(ek_adapter_opt_collect_slot(ek_opt) == -1 &&
2585 ek_adapter_opt_collect_count(ek_opt) == -1 &&
2586 (ek_adapter_opt_collect_type(ek_opt) == dest ||
2587 ek_adapter_opt_collect_type(ek_opt) == T_INT && is_subword_type(dest)),
2588 "");
2589
2590 if (dest == T_OBJECT && elem_slots == 0 && OptimizeMethodHandles) {
2591 // if there are no args, just pretend it's a collect
2592 ek_opt = _adapter_opt_collect_0_ref;
2593 break;
2594 }
2595
2596 if (dest == T_OBJECT && OptimizeMethodHandles) {
2597 // try to use a fixed length adapter
2598 ek_try = EntryKind(_adapter_opt_fold_1_ref - 1 + elem_slots);
2599 if (ek_try < _adapter_opt_fold_LAST &&
2600 ek_adapter_opt_collect_count(ek_try) == elem_slots) {
2601 assert(ek_adapter_opt_collect_slot(ek_try) == -1 &&
2602 ek_adapter_opt_collect_type(ek_try) == dest, "");
2603 ek_opt = ek_try;
2604 break;
2605 }
2606 }
2607
2608 break;
2609 }
2610
2611 default:
2612 // should have failed much earlier; must be a missing case here
2613 assert(false, "incomplete switch");
2614 // and fall through:
2615
2616 throw_not_impl:
2617 if (err == NULL)
2618 err = "unknown adapter type";
2619 break;
2620 }
2621
2622 if (err == NULL && (vminfo & CONV_VMINFO_MASK) != vminfo) {
2623 // should not happen, since vminfo is used to encode arg/slot indexes < 255
2624 err = "vminfo overflow";
2625 }
2626
2627 if (err == NULL && !have_entry(ek_opt)) {
2628 err = "adapter stub for this kind of method handle is missing";
2629 }
2630
2631 if (err == NULL && ek_opt == ek_orig) {
2632 switch (ek_opt) {
2633 case _adapter_prim_to_prim:
2634 case _adapter_ref_to_prim:
2635 case _adapter_prim_to_ref:
2636 case _adapter_swap_args:
2637 case _adapter_rot_args:
2638 case _adapter_collect_args:
2639 case _adapter_fold_args:
2640 case _adapter_spread_args:
2641 // should be handled completely by optimized cases; see above
2642 err = "init_AdapterMethodHandle should not issue this";
2643 break;
2644 }
2645 }
2646
2647 if (err != NULL) {
2648 throw_InternalError_for_bad_conversion(conversion, err_msg("%s: conv_op %d ek_opt %d", err, conv_op, ek_opt), THREAD);
2649 return;
2650 }
2651
2652 // Rebuild the conversion value; maybe parts of it were changed.
2653 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo);
2654
2655 // Finalize the conversion field. (Note that it is final to Java code.)
2656 java_lang_invoke_AdapterMethodHandle::set_conversion(mh(), new_conversion);
2657
2658 if (java_lang_invoke_CountingMethodHandle::is_instance(mh())) {
2659 assert(ek_orig == _adapter_retype_only, "only one handled");
2660 ek_opt = _adapter_opt_profiling;
2661 }
2662
2663 // Done!
2664 java_lang_invoke_MethodHandle::set_vmentry(mh(), entry(ek_opt));
2665
2666 // There should be enough memory barriers on exit from native methods
2667 // to ensure that the MH is fully initialized to all threads before
2668 // Java code can publish it in global data structures.
2669 }
2670
2671 void MethodHandles::ensure_vmlayout_field(Handle target, TRAPS) {
2672 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(target()));
2673 Handle mtform(THREAD, java_lang_invoke_MethodType::form(mtype()));
2674 if (mtform.is_null()) { THROW(vmSymbols::java_lang_InternalError()); }
2675 if (java_lang_invoke_MethodTypeForm::vmlayout_offset_in_bytes() > 0) {
2676 if (java_lang_invoke_MethodTypeForm::vmlayout(mtform()) == NULL) {
2677 // fill it in
2678 Handle erased_mtype(THREAD, java_lang_invoke_MethodTypeForm::erasedType(mtform()));
2679 TempNewSymbol erased_signature
2680 = java_lang_invoke_MethodType::as_signature(erased_mtype(), /*intern:*/true, CHECK);
2681 methodOop cookie
2682 = SystemDictionary::find_method_handle_invoke(vmSymbols::invokeExact_name(),
2683 erased_signature,
2684 SystemDictionaryHandles::Object_klass(),
2685 THREAD);
2686 java_lang_invoke_MethodTypeForm::init_vmlayout(mtform(), cookie);
2687 }
2688 }
2689 }
2690
2691 #ifdef ASSERT
2692
2693 extern "C"
2694 void print_method_handle(oop mh);
2695
2696 static void stress_method_handle_walk_impl(Handle mh, TRAPS) {
2697 if (StressMethodHandleWalk) {
2698 // Exercise the MethodHandleWalk code in various ways and validate
2699 // the resulting method oop. Some of these produce output so they
2700 // are guarded under Verbose.
2701 ResourceMark rm;
2702 HandleMark hm;
2703 if (Verbose) {
2704 print_method_handle(mh());
2705 }
2706 TempNewSymbol name = SymbolTable::new_symbol("invoke", CHECK);
2707 Handle mt = java_lang_invoke_MethodHandle::type(mh());
2708 TempNewSymbol signature = java_lang_invoke_MethodType::as_signature(mt(), true, CHECK);
2709 MethodHandleCompiler mhc(mh, name, signature, 10000, false, CHECK);
2710 methodHandle m = mhc.compile(CHECK);
2711 if (Verbose) {
2712 m->print_codes();
2713 }
2714 InterpreterOopMap mask;
2715 OopMapCache::compute_one_oop_map(m, m->code_size() - 1, &mask);
2716 // compile to object code if -Xcomp or WizardMode
2717 if ((WizardMode ||
2718 CompilationPolicy::must_be_compiled(m))
2719 && !instanceKlass::cast(m->method_holder())->is_not_initialized()
2720 && CompilationPolicy::can_be_compiled(m)) {
2721 // Force compilation
2722 CompileBroker::compile_method(m, InvocationEntryBci,
2723 CompilationPolicy::policy()->initial_compile_level(),
2724 methodHandle(), 0, "StressMethodHandleWalk",
2725 CHECK);
2726 }
2727 }
2728 }
2729
2730 static void stress_method_handle_walk(Handle mh, TRAPS) {
2731 stress_method_handle_walk_impl(mh, THREAD);
2732 if (HAS_PENDING_EXCEPTION) {
2733 oop ex = PENDING_EXCEPTION;
2734 CLEAR_PENDING_EXCEPTION;
2735 tty->print("StressMethodHandleWalk: ");
2736 java_lang_Throwable::print(ex, tty);
2737 tty->cr();
2738 }
2739 }
2740 #else
2741
2742 static void stress_method_handle_walk(Handle mh, TRAPS) {}
2743
2744 #endif
2745
2746 //
2747 // Here are the native methods on sun.invoke.MethodHandleImpl.
2748 // They are the private interface between this JVM and the HotSpot-specific
2749 // Java code that implements JSR 292 method handles.
2750 //
2751 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
2752 // that intrinsic (non-JNI) native methods are defined in HotSpot.
2753 //
2754
2755 // direct method handles for invokestatic or invokespecial
2756 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller);
2757 JVM_ENTRY(void, MHN_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2758 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) {
2759 ResourceMark rm; // for error messages
2760
2761 // This is the guy we are initializing:
2762 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2763 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2764
2765 // Early returns out of this method leave the DMH in an unfinished state.
2766 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2767
2768 // which method are we really talking about?
2769 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2770 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2771 if (java_lang_invoke_MemberName::is_instance(target()) &&
2772 java_lang_invoke_MemberName::vmindex(target()) == VM_INDEX_UNINITIALIZED) {
2773 MethodHandles::resolve_MemberName(target, CHECK);
2774 }
2775
2776 KlassHandle receiver_limit; int decode_flags = 0;
2777 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags);
2778 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); }
2779
2780 // The trusted Java code that calls this method should already have performed
2781 // access checks on behalf of the given caller. But, we can verify this.
2782 if (VerifyMethodHandles && caller_jh != NULL) {
2783 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)));
2784 // If this were a bytecode, the first access check would be against
2785 // the "reference class" mentioned in the CONSTANT_Methodref.
2786 // We don't know at this point which class that was, and if we
2787 // check against m.method_holder we might get the wrong answer.
2788 // So we just make sure to handle this check when the resolution
2789 // happens, when we call resolve_MemberName.
2790 //
2791 // (A public class can inherit public members from private supers,
2792 // and it would be wrong to check access against the private super
2793 // if the original symbolic reference was against the public class.)
2794 //
2795 // If there were a bytecode, the next step would be to lookup the method
2796 // in the reference class, then then check the method's access bits.
2797 // Emulate LinkResolver::check_method_accessability.
2798 klassOop resolved_klass = m->method_holder();
2799 if (!Reflection::verify_field_access(caller->as_klassOop(),
2800 resolved_klass, resolved_klass,
2801 m->access_flags(),
2802 true)) {
2803 // %%% following cutout belongs in Reflection::verify_field_access?
2804 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(),
2805 resolved_klass, THREAD);
2806 if (!same_pm) {
2807 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string());
2808 }
2809 }
2810 }
2811
2812 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK);
2813 stress_method_handle_walk(mh, CHECK);
2814 }
2815 JVM_END
2816
2817 // bound method handles
2818 JVM_ENTRY(void, MHN_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2819 jobject target_jh, int argnum)) {
2820 ResourceMark rm; // for error messages
2821
2822 // This is the guy we are initializing:
2823 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2824 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2825
2826 // Early returns out of this method leave the BMH in an unfinished state.
2827 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2828
2829 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2830 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2831
2832 if (!java_lang_invoke_MethodHandle::is_instance(target())) {
2833 // Target object is a reflective method. (%%% Do we need this alternate path?)
2834 Untested("init_BMH of non-MH");
2835 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); }
2836 KlassHandle receiver_limit; int decode_flags = 0;
2837 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags);
2838 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m,
2839 receiver_limit,
2840 decode_flags,
2841 CHECK);
2842 } else {
2843 // Build a BMH on top of a DMH or another BMH:
2844 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK);
2845 }
2846
2847 if (StressMethodHandleWalk) {
2848 if (mh->klass() == SystemDictionary::BoundMethodHandle_klass())
2849 stress_method_handle_walk(mh, CHECK);
2850 // else don't, since the subclass has not yet initialized its own fields
2851 }
2852 }
2853 JVM_END
2854
2855 // adapter method handles
2856 JVM_ENTRY(void, MHN_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2857 jobject target_jh, int argnum)) {
2858 // This is the guy we are initializing:
2859 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2860 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2861 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2862 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2863
2864 // Early returns out of this method leave the AMH in an unfinished state.
2865 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2866
2867 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK);
2868 stress_method_handle_walk(mh, CHECK);
2869 }
2870 JVM_END
2871
2872 // method type forms
2873 JVM_ENTRY(void, MHN_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) {
2874 if (erased_jh == NULL) return;
2875 if (TraceMethodHandles) {
2876 tty->print("creating MethodType form ");
2877 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH!
2878 // call Object.toString()
2879 Symbol* name = vmSymbols::toString_name();
2880 Symbol* sig = vmSymbols::void_string_signature();
2881 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh)));
2882 JavaValue result(T_OBJECT);
2883 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig,
2884 &args, CHECK);
2885 Handle str(THREAD, (oop)result.get_jobject());
2886 java_lang_String::print(str, tty);
2887 }
2888 tty->cr();
2889 }
2890 }
2891 JVM_END
2892
2893 // debugging and reflection
2894 JVM_ENTRY(jobject, MHN_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) {
2895 Handle mh(THREAD, JNIHandles::resolve(mh_jh));
2896 if (!java_lang_invoke_MethodHandle::is_instance(mh())) {
2897 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
2898 }
2899 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL);
2900 return JNIHandles::make_local(THREAD, target);
2901 }
2902 JVM_END
2903
2904 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
2905 switch (which) {
2906 case MethodHandles::GC_JVM_PUSH_LIMIT:
2907 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF,
2908 "MethodHandlePushLimit parameter must be in valid range");
2909 return MethodHandlePushLimit;
2910 case MethodHandles::GC_JVM_STACK_MOVE_UNIT:
2911 // return number of words per slot, signed according to stack direction
2912 return MethodHandles::stack_move_unit();
2913 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK:
2914 return MethodHandles::adapter_conversion_ops_supported_mask();
2915 case MethodHandles::GC_COUNT_GWT:
2916 #ifdef COMPILER2
2917 return true;
2918 #else
2919 return false;
2920 #endif
2921 }
2922 return 0;
2923 }
2924 JVM_END
2925
2926 #ifndef PRODUCT
2927 #define EACH_NAMED_CON(template) \
2928 /* hold back this one until JDK stabilizes */ \
2929 /* template(MethodHandles,GC_JVM_PUSH_LIMIT) */ \
2930 /* hold back this one until JDK stabilizes */ \
2931 /* template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) */ \
2932 /* hold back this one until JDK stabilizes */ \
2933 /* template(MethodHandles,GC_OP_ROT_ARGS_DOWN_LIMIT_BIAS) */ \
2934 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \
2935 template(MethodHandles,ETF_DIRECT_HANDLE) \
2936 template(MethodHandles,ETF_METHOD_NAME) \
2937 template(MethodHandles,ETF_REFLECT_METHOD) \
2938 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
2939 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
2940 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
2941 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
2942 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
2943 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
2944 template(java_lang_invoke_MemberName,VM_INDEX_UNINITIALIZED) \
2945 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_ONLY) \
2946 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_RAW) \
2947 template(java_lang_invoke_AdapterMethodHandle,OP_CHECK_CAST) \
2948 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_PRIM) \
2949 template(java_lang_invoke_AdapterMethodHandle,OP_REF_TO_PRIM) \
2950 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_REF) \
2951 template(java_lang_invoke_AdapterMethodHandle,OP_SWAP_ARGS) \
2952 template(java_lang_invoke_AdapterMethodHandle,OP_ROT_ARGS) \
2953 template(java_lang_invoke_AdapterMethodHandle,OP_DUP_ARGS) \
2954 template(java_lang_invoke_AdapterMethodHandle,OP_DROP_ARGS) \
2955 template(java_lang_invoke_AdapterMethodHandle,OP_COLLECT_ARGS) \
2956 template(java_lang_invoke_AdapterMethodHandle,OP_SPREAD_ARGS) \
2957 /* hold back this one until JDK stabilizes */ \
2958 /*template(java_lang_invoke_AdapterMethodHandle,CONV_OP_LIMIT)*/ \
2959 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_MASK) \
2960 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_MASK) \
2961 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_SHIFT) \
2962 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_SHIFT) \
2963 template(java_lang_invoke_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \
2964 template(java_lang_invoke_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \
2965 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \
2966 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \
2967 /*end*/
2968
2969 #define ONE_PLUS(scope,value) 1+
2970 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0;
2971 #define VALUE_COMMA(scope,value) scope::value,
2972 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 };
2973 #define STRING_NULL(scope,value) #value "\0"
2974 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) };
2975
2976 #undef ONE_PLUS
2977 #undef VALUE_COMMA
2978 #undef STRING_NULL
2979 #undef EACH_NAMED_CON
2980 #endif
2981
2982 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
2983 #ifndef PRODUCT
2984 if (which >= 0 && which < con_value_count) {
2985 int con = con_values[which];
2986 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
2987 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
2988 const char* str = &con_names[0];
2989 for (int i = 0; i < which; i++)
2990 str += strlen(str) + 1; // skip name and null
2991 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
2992 box->obj_at_put(0, name);
2993 }
2994 return con;
2995 }
2996 #endif
2997 return 0;
2998 }
2999 JVM_END
3000
3001 // void init(MemberName self, AccessibleObject ref)
3002 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
3003 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
3004 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
3005 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
3006 oop target_oop = JNIHandles::resolve_non_null(target_jh);
3007 MethodHandles::init_MemberName(mname(), target_oop);
3008 }
3009 JVM_END
3010
3011 // void expand(MemberName self)
3012 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
3013 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
3014 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
3015 MethodHandles::expand_MemberName(mname, 0, CHECK);
3016 }
3017 JVM_END
3018
3019 // void resolve(MemberName self, Class<?> caller)
3020 JVM_ENTRY(void, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
3021 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
3022 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
3023
3024 // The trusted Java code that calls this method should already have performed
3025 // access checks on behalf of the given caller. But, we can verify this.
3026 if (VerifyMethodHandles && caller_jh != NULL) {
3027 klassOop reference_klass = java_lang_Class::as_klassOop(java_lang_invoke_MemberName::clazz(mname()));
3028 if (reference_klass != NULL) {
3029 // Emulate LinkResolver::check_klass_accessability.
3030 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh));
3031 if (!Reflection::verify_class_access(caller,
3032 reference_klass,
3033 true)) {
3034 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name());
3035 }
3036 }
3037 }
3038
3039 MethodHandles::resolve_MemberName(mname, CHECK);
3040 }
3041 JVM_END
3042
3043 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
3044 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
3045 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
3046 jclass clazz_jh, jstring name_jh, jstring sig_jh,
3047 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
3048 if (clazz_jh == NULL || results_jh == NULL) return -1;
3049 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)));
3050
3051 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
3052 if (results.is_null() || !results->is_objArray()) return -1;
3053
3054 TempNewSymbol name = NULL;
3055 TempNewSymbol sig = NULL;
3056 if (name_jh != NULL) {
3057 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
3058 if (name == NULL) return 0; // a match is not possible
3059 }
3060 if (sig_jh != NULL) {
3061 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
3062 if (sig == NULL) return 0; // a match is not possible
3063 }
3064
3065 KlassHandle caller;
3066 if (caller_jh != NULL) {
3067 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
3068 if (!java_lang_Class::is_instance(caller_oop)) return -1;
3069 caller = KlassHandle(THREAD, java_lang_Class::as_klassOop(caller_oop));
3070 }
3071
3072 if (name != NULL && sig != NULL && results.not_null()) {
3073 // try a direct resolve
3074 // %%% TO DO
3075 }
3076
3077 int res = MethodHandles::find_MemberNames(k(), name, sig, mflags,
3078 caller(), skip, results());
3079 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
3080 return res;
3081 }
3082 JVM_END
3083
3084 methodOop MethodHandles::resolve_raise_exception_method(TRAPS) {
3085 if (_raise_exception_method != NULL) {
3086 // no need to do it twice
3087 return raise_exception_method();
3088 }
3089 // LinkResolver::resolve_invokedynamic can reach this point
3090 // because an invokedynamic has failed very early (7049415)
3091 KlassHandle MHN_klass = SystemDictionaryHandles::MethodHandleNatives_klass();
3092 if (MHN_klass.not_null()) {
3093 TempNewSymbol raiseException_name = SymbolTable::new_symbol("raiseException", CHECK_NULL);
3094 TempNewSymbol raiseException_sig = SymbolTable::new_symbol("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK_NULL);
3095 methodOop raiseException_method = instanceKlass::cast(MHN_klass->as_klassOop())
3096 ->find_method(raiseException_name, raiseException_sig);
3097 if (raiseException_method != NULL && raiseException_method->is_static()) {
3098 return raiseException_method;
3099 }
3100 }
3101 // not found; let the caller deal with it
3102 return NULL;
3103 }
3104 void MethodHandles::raise_exception(int code, oop actual, oop required, TRAPS) {
3105 methodOop raiseException_method = resolve_raise_exception_method(CHECK);
3106 if (raiseException_method != NULL &&
3107 instanceKlass::cast(raiseException_method->method_holder())->is_not_initialized()) {
3108 instanceKlass::cast(raiseException_method->method_holder())->initialize(CHECK);
3109 // it had better be resolved by now, or maybe JSR 292 failed to load
3110 raiseException_method = raise_exception_method();
3111 }
3112 if (raiseException_method == NULL) {
3113 THROW_MSG(vmSymbols::java_lang_InternalError(), "no raiseException method");
3114 }
3115 JavaCallArguments args;
3116 args.push_int(code);
3117 args.push_oop(actual);
3118 args.push_oop(required);
3119 JavaValue result(T_VOID);
3120 JavaCalls::call(&result, raiseException_method, &args, CHECK);
3121 }
3122
3123 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) {
3124 TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL);
3125 THROW_MSG_NULL(UOE_name, "MethodHandle.invoke cannot be invoked reflectively");
3126 return NULL;
3127 }
3128 JVM_END
3129
3130 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) {
3131 TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL);
3132 THROW_MSG_NULL(UOE_name, "MethodHandle.invokeExact cannot be invoked reflectively");
3133 return NULL;
3134 }
3135 JVM_END
3136
3137
3138 /// JVM_RegisterMethodHandleMethods
3139
3140 #define LANG "Ljava/lang/"
3141 #define JLINV "Ljava/lang/invoke/"
3142
3143 #define OBJ LANG"Object;"
3144 #define CLS LANG"Class;"
3145 #define STRG LANG"String;"
3146 #define MT JLINV"MethodType;"
3147 #define MH JLINV"MethodHandle;"
3148 #define MEM JLINV"MemberName;"
3149 #define AMH JLINV"AdapterMethodHandle;"
3150 #define BMH JLINV"BoundMethodHandle;"
3151 #define DMH JLINV"DirectMethodHandle;"
3152
3153 #define CC (char*) /*cast a literal from (const char*)*/
3154 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
3155
3156 // These are the native methods on sun.invoke.MethodHandleNatives.
3157 static JNINativeMethod methods[] = {
3158 // void init(MemberName self, AccessibleObject ref)
3159 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHN_init_AMH)},
3160 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHN_init_BMH)},
3161 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHN_init_DMH)},
3162 {CC"init", CC"("MT")V", FN_PTR(MHN_init_MT)},
3163 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
3164 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
3165 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHN_resolve_Mem)},
3166 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHN_getTarget)},
3167 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
3168 // static native int getNamedCon(int which, Object[] name)
3169 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
3170 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
3171 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
3172 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}
3173 };
3174
3175 static JNINativeMethod invoke_methods[] = {
3176 // void init(MemberName self, AccessibleObject ref)
3177 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
3178 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
3179 };
3180
3181 // This one function is exported, used by NativeLookup.
3182
3183 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
3184 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK");
3185
3186 if (!EnableInvokeDynamic) {
3187 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
3188 return; // bind nothing
3189 }
3190
3191 bool enable_MH = true;
3192
3193 {
3194 ThreadToNativeFromVM ttnfv(thread);
3195
3196 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod));
3197 if (!env->ExceptionOccurred()) {
3198 const char* L_MH_name = (JLINV "MethodHandle");
3199 const char* MH_name = L_MH_name+1;
3200 jclass MH_class = env->FindClass(MH_name);
3201 status = env->RegisterNatives(MH_class, invoke_methods, sizeof(invoke_methods)/sizeof(JNINativeMethod));
3202 }
3203 if (env->ExceptionOccurred()) {
3204 MethodHandles::set_enabled(false);
3205 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
3206 enable_MH = false;
3207 env->ExceptionClear();
3208 }
3209 }
3210
3211 if (enable_MH) {
3212 methodOop raiseException_method = MethodHandles::resolve_raise_exception_method(CHECK);
3213 if (raiseException_method != NULL) {
3214 MethodHandles::set_raise_exception_method(raiseException_method);
3215 } else {
3216 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
3217 enable_MH = false;
3218 }
3219 }
3220
3221 if (enable_MH) {
3222 MethodHandles::generate_adapters();
3223 MethodHandles::set_enabled(true);
3224 }
3225 }
3226 JVM_END