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