1 /*
2 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "compiler/compileBroker.hpp"
28 #include "interpreter/interpreter.hpp"
29 #include "interpreter/oopMapCache.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "prims/methodHandles.hpp"
33 #include "prims/methodHandleWalk.hpp"
34 #include "runtime/compilationPolicy.hpp"
35 #include "runtime/javaCalls.hpp"
36 #include "runtime/reflection.hpp"
37 #include "runtime/signature.hpp"
38 #include "runtime/stubRoutines.hpp"
39
40 /*
41 * JSR 292 reference implementation: method handles
42 */
43
44 bool MethodHandles::_enabled = false; // set true after successful native linkage
45
46 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL};
47 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = {
48 "raise_exception",
49 "invokestatic", // how a MH emulates invokestatic
50 "invokespecial", // ditto for the other invokes...
51 "invokevirtual",
52 "invokeinterface",
53 "bound_ref", // these are for BMH...
54 "bound_int",
55 "bound_long",
56 "bound_ref_direct", // (direct versions have a direct methodOop)
57 "bound_int_direct",
58 "bound_long_direct",
59
60 // starting at _adapter_mh_first:
61 "adapter_retype_only", // these are for AMH...
62 "adapter_retype_raw",
63 "adapter_check_cast",
64 "adapter_prim_to_prim",
65 "adapter_ref_to_prim",
66 "adapter_prim_to_ref",
67 "adapter_swap_args",
68 "adapter_rot_args",
69 "adapter_dup_args",
70 "adapter_drop_args",
71 "adapter_collect_args",
72 "adapter_spread_args",
73 "adapter_fold_args",
74 "adapter_unused_13",
75
76 // optimized adapter types:
77 "adapter_swap_args/1",
78 "adapter_swap_args/2",
79 "adapter_rot_args/1,up",
80 "adapter_rot_args/1,down",
81 "adapter_rot_args/2,up",
82 "adapter_rot_args/2,down",
83 "adapter_prim_to_prim/i2i",
84 "adapter_prim_to_prim/l2i",
85 "adapter_prim_to_prim/d2f",
86 "adapter_prim_to_prim/i2l",
87 "adapter_prim_to_prim/f2d",
88 "adapter_ref_to_prim/unboxi",
89 "adapter_ref_to_prim/unboxl",
90
91 // return value handlers for collect/filter/fold adapters:
92 "return/ref",
93 "return/int",
94 "return/long",
95 "return/float",
96 "return/double",
97 "return/void",
98 "return/S0/ref",
99 "return/S1/ref",
100 "return/S2/ref",
101 "return/S3/ref",
102 "return/S4/ref",
103 "return/S5/ref",
104 "return/any",
105
106 // spreading (array length cases 0, 1, ...)
107 "adapter_spread/0",
108 "adapter_spread/1/ref",
109 "adapter_spread/2/ref",
110 "adapter_spread/3/ref",
111 "adapter_spread/4/ref",
112 "adapter_spread/5/ref",
113 "adapter_spread/ref",
114 "adapter_spread/byte",
115 "adapter_spread/char",
116 "adapter_spread/short",
117 "adapter_spread/int",
118 "adapter_spread/long",
119 "adapter_spread/float",
120 "adapter_spread/double",
121
122 // blocking filter/collect conversions:
123 "adapter_collect/ref",
124 "adapter_collect/int",
125 "adapter_collect/long",
126 "adapter_collect/float",
127 "adapter_collect/double",
128 "adapter_collect/void",
129 "adapter_collect/0/ref",
130 "adapter_collect/1/ref",
131 "adapter_collect/2/ref",
132 "adapter_collect/3/ref",
133 "adapter_collect/4/ref",
134 "adapter_collect/5/ref",
135 "adapter_filter/S0/ref",
136 "adapter_filter/S1/ref",
137 "adapter_filter/S2/ref",
138 "adapter_filter/S3/ref",
139 "adapter_filter/S4/ref",
140 "adapter_filter/S5/ref",
141 "adapter_collect/2/S0/ref",
142 "adapter_collect/2/S1/ref",
143 "adapter_collect/2/S2/ref",
144 "adapter_collect/2/S3/ref",
145 "adapter_collect/2/S4/ref",
146 "adapter_collect/2/S5/ref",
147
148 // blocking fold conversions:
149 "adapter_fold/ref",
150 "adapter_fold/int",
151 "adapter_fold/long",
152 "adapter_fold/float",
153 "adapter_fold/double",
154 "adapter_fold/void",
155 "adapter_fold/1/ref",
156 "adapter_fold/2/ref",
157 "adapter_fold/3/ref",
158 "adapter_fold/4/ref",
159 "adapter_fold/5/ref",
160
161 "adapter_opt_profiling",
162
163 NULL
164 };
165
166 // Adapters.
167 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
168
169 jobject MethodHandles::_raise_exception_method;
170
171 address MethodHandles::_adapter_return_handlers[CONV_TYPE_MASK+1];
172
173 #ifdef ASSERT
174 bool MethodHandles::spot_check_entry_names() {
175 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), "");
176 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), "");
177 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), "");
178 assert(!strcmp(entry_name(_adapter_fold_args), "adapter_fold_args"), "");
179 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), "");
180 assert(!strcmp(entry_name(_adapter_opt_spread_char), "adapter_spread/char"), "");
181 assert(!strcmp(entry_name(_adapter_opt_spread_double), "adapter_spread/double"), "");
182 assert(!strcmp(entry_name(_adapter_opt_collect_int), "adapter_collect/int"), "");
183 assert(!strcmp(entry_name(_adapter_opt_collect_0_ref), "adapter_collect/0/ref"), "");
184 assert(!strcmp(entry_name(_adapter_opt_collect_2_S3_ref), "adapter_collect/2/S3/ref"), "");
185 assert(!strcmp(entry_name(_adapter_opt_filter_S5_ref), "adapter_filter/S5/ref"), "");
186 assert(!strcmp(entry_name(_adapter_opt_fold_3_ref), "adapter_fold/3/ref"), "");
187 assert(!strcmp(entry_name(_adapter_opt_fold_void), "adapter_fold/void"), "");
188 return true;
189 }
190 #endif
191
192
193 //------------------------------------------------------------------------------
194 // MethodHandles::generate_adapters
195 //
196 void MethodHandles::generate_adapters() {
197 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
198
199 assert(_adapter_code == NULL, "generate only once");
200
201 ResourceMark rm;
202 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
203 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
204 if (_adapter_code == NULL)
205 vm_exit_out_of_memory(adapter_code_size, "CodeCache: no room for MethodHandles adapters");
206 {
207 CodeBuffer code(_adapter_code);
208 MethodHandlesAdapterGenerator g(&code);
209 g.generate();
210 code.log_section_sizes("MethodHandlesAdapterBlob");
211 }
212 }
213
214 //------------------------------------------------------------------------------
215 // MethodHandlesAdapterGenerator::generate
216 //
217 void MethodHandlesAdapterGenerator::generate() {
218 // Generate generic method handle adapters.
219 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST;
220 ek < MethodHandles::_EK_LIMIT;
221 ek = MethodHandles::EntryKind(1 + (int)ek)) {
222 if (MethodHandles::ek_supported(ek)) {
223 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek));
224 MethodHandles::generate_method_handle_stub(_masm, ek);
225 }
226 }
227 }
228
229
230 //------------------------------------------------------------------------------
231 // MethodHandles::ek_supported
232 //
233 bool MethodHandles::ek_supported(MethodHandles::EntryKind ek) {
234 MethodHandles::EntryKind ek_orig = MethodHandles::ek_original_kind(ek);
235 switch (ek_orig) {
236 case _adapter_unused_13:
237 return false; // not defined yet
238 case _adapter_prim_to_ref:
239 return conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF);
240 case _adapter_collect_args:
241 return conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS);
242 case _adapter_fold_args:
243 return conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS);
244 }
245 return true;
246 }
247
248
249 void MethodHandles::set_enabled(bool z) {
250 if (_enabled != z) {
251 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
252 _enabled = z;
253 }
254 }
255
256 // Note: A method which does not have a TRAPS argument cannot block in the GC
257 // or throw exceptions. Such methods are used in this file to do something quick
258 // and local, like parse a data structure. For speed, such methods work on plain
259 // oops, not handles. Trapping methods uniformly operate on handles.
260
261 methodHandle MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype,
262 KlassHandle& receiver_limit_result, int& decode_flags_result) {
263 if (vmtarget == NULL) return methodHandle();
264 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding");
265 if (vmindex < 0) {
266 // this DMH performs no dispatch; it is directly bound to a methodOop
267 // A MemberName may either be directly bound to a methodOop,
268 // or it may use the klass/index form; both forms mean the same thing.
269 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result);
270 if ((decode_flags_result & _dmf_has_receiver) != 0
271 && java_lang_invoke_MethodType::is_instance(mtype)) {
272 // Extract receiver type restriction from mtype.ptypes[0].
273 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype);
274 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0);
275 if (java_lang_Class::is_instance(ptype0))
276 receiver_limit_result = java_lang_Class::as_klassOop(ptype0);
277 }
278 if (vmindex == methodOopDesc::nonvirtual_vtable_index) {
279 // this DMH can be an "invokespecial" version
280 decode_flags_result &= ~_dmf_does_dispatch;
281 } else {
282 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?");
283 }
284 return m;
285 } else {
286 assert(vmtarget->is_klass(), "must be class or interface");
287 decode_flags_result |= MethodHandles::_dmf_does_dispatch;
288 decode_flags_result |= MethodHandles::_dmf_has_receiver;
289 receiver_limit_result = (klassOop)vmtarget;
290 Klass* tk = Klass::cast((klassOop)vmtarget);
291 if (tk->is_interface()) {
292 // an itable linkage is <interface, itable index>
293 decode_flags_result |= MethodHandles::_dmf_from_interface;
294 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex);
295 } else {
296 if (!tk->oop_is_instance())
297 tk = instanceKlass::cast(SystemDictionary::Object_klass());
298 return ((instanceKlass*)tk)->method_at_vtable(vmindex);
299 }
300 }
301 }
302
303 // MemberName and DirectMethodHandle have the same linkage to the JVM internals.
304 // (MemberName is the non-operational name used for queries and setup.)
305
306 methodHandle MethodHandles::decode_DirectMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
307 oop vmtarget = java_lang_invoke_DirectMethodHandle::vmtarget(mh);
308 int vmindex = java_lang_invoke_DirectMethodHandle::vmindex(mh);
309 oop mtype = java_lang_invoke_DirectMethodHandle::type(mh);
310 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result);
311 }
312
313 methodHandle MethodHandles::decode_BoundMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
314 assert(java_lang_invoke_BoundMethodHandle::is_instance(mh), "");
315 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), "");
316 for (oop bmh = mh;;) {
317 // Bound MHs can be stacked to bind several arguments.
318 oop target = java_lang_invoke_MethodHandle::vmtarget(bmh);
319 if (target == NULL) return methodHandle();
320 decode_flags_result |= MethodHandles::_dmf_binds_argument;
321 klassOop tk = target->klass();
322 if (tk == SystemDictionary::BoundMethodHandle_klass()) {
323 bmh = target;
324 continue;
325 } else {
326 if (java_lang_invoke_MethodHandle::is_subclass(tk)) {
327 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH");
328 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
329 } else {
330 // Optimized case: binding a receiver to a non-dispatched DMH
331 // short-circuits directly to the methodOop.
332 // (It might be another argument besides a receiver also.)
333 assert(target->is_method(), "must be a simple method");
334 decode_flags_result |= MethodHandles::_dmf_binds_method;
335 methodOop m = (methodOop) target;
336 if (!m->is_static())
337 decode_flags_result |= MethodHandles::_dmf_has_receiver;
338 return m;
339 }
340 }
341 }
342 }
343
344 methodHandle MethodHandles::decode_AdapterMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
345 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), "");
346 for (oop amh = mh;;) {
347 // Adapter MHs can be stacked to convert several arguments.
348 int conv_op = adapter_conversion_op(java_lang_invoke_AdapterMethodHandle::conversion(amh));
349 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK;
350 oop target = java_lang_invoke_MethodHandle::vmtarget(amh);
351 if (target == NULL) return methodHandle();
352 klassOop tk = target->klass();
353 if (tk == SystemDictionary::AdapterMethodHandle_klass()) {
354 amh = target;
355 continue;
356 } else {
357 // must be a BMH (which will bind some more arguments) or a DMH (for the final call)
358 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
359 }
360 }
361 }
362
363 methodHandle MethodHandles::decode_MethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
364 if (mh == NULL) return methodHandle();
365 klassOop mhk = mh->klass();
366 assert(java_lang_invoke_MethodHandle::is_subclass(mhk), "must be a MethodHandle");
367 if (mhk == SystemDictionary::DirectMethodHandle_klass()) {
368 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result);
369 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) {
370 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
371 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) {
372 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result);
373 } else if (java_lang_invoke_BoundMethodHandle::is_subclass(mhk)) {
374 // could be a JavaMethodHandle (but not an adapter MH)
375 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
376 } else {
377 assert(false, "cannot parse this MH");
378 return methodHandle(); // random MH?
379 }
380 }
381
382 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) {
383 assert(m->is_method(), "");
384 if (m->is_static()) {
385 // check that signature begins '(L' or '([' (not '(I', '()', etc.)
386 Symbol* sig = m->signature();
387 BasicType recv_bt = char2type(sig->byte_at(1));
388 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')'
389 assert(sig->byte_at(0) == '(', "must be method sig");
390 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY)
391 // decode_flags_result |= _dmf_has_receiver;
392 } else {
393 // non-static method
394 decode_flags_result |= _dmf_has_receiver;
395 if (!m->can_be_statically_bound() && !m->is_initializer()) {
396 decode_flags_result |= _dmf_does_dispatch;
397 if (Klass::cast(m->method_holder())->is_interface())
398 decode_flags_result |= _dmf_from_interface;
399 }
400 }
401 return m;
402 }
403
404
405 // A trusted party is handing us a cookie to determine a method.
406 // Let's boil it down to the method oop they really want.
407 methodHandle MethodHandles::decode_method(oop x, KlassHandle& receiver_limit_result, int& decode_flags_result) {
408 decode_flags_result = 0;
409 receiver_limit_result = KlassHandle();
410 klassOop xk = x->klass();
411 if (xk == Universe::methodKlassObj()) {
412 return decode_methodOop((methodOop) x, decode_flags_result);
413 } else if (xk == SystemDictionary::MemberName_klass()) {
414 // Note: This only works if the MemberName has already been resolved.
415 return decode_MemberName(x, receiver_limit_result, decode_flags_result);
416 } else if (java_lang_invoke_MethodHandle::is_subclass(xk)) {
417 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result);
418 } else if (xk == SystemDictionary::reflect_Method_klass()) {
419 oop clazz = java_lang_reflect_Method::clazz(x);
420 int slot = java_lang_reflect_Method::slot(x);
421 klassOop k = java_lang_Class::as_klassOop(clazz);
422 if (k != NULL && Klass::cast(k)->oop_is_instance())
423 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
424 decode_flags_result);
425 } else if (xk == SystemDictionary::reflect_Constructor_klass()) {
426 oop clazz = java_lang_reflect_Constructor::clazz(x);
427 int slot = java_lang_reflect_Constructor::slot(x);
428 klassOop k = java_lang_Class::as_klassOop(clazz);
429 if (k != NULL && Klass::cast(k)->oop_is_instance())
430 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
431 decode_flags_result);
432 } else {
433 // unrecognized object
434 assert(!x->is_method(), "already checked");
435 assert(!java_lang_invoke_MemberName::is_instance(x), "already checked");
436 }
437 return methodHandle();
438 }
439
440
441 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) {
442 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass())
443 return 0; // no push/pop
444 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh);
445 int last_vmslots = 0;
446 oop last_mh = mh;
447 for (;;) {
448 oop target = java_lang_invoke_MethodHandle::vmtarget(last_mh);
449 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
450 last_vmslots = java_lang_invoke_MethodHandle::vmslots(target);
451 break;
452 } else if (!java_lang_invoke_MethodHandle::is_instance(target)) {
453 // might be klass or method
454 assert(target->is_method(), "must get here with a direct ref to method");
455 last_vmslots = methodOop(target)->size_of_parameters();
456 break;
457 }
458 last_mh = target;
459 }
460 // If I am called with fewer VM slots than my ultimate callee,
461 // it must be that I push the additionally needed slots.
462 // Likewise if am called with more VM slots, I will pop them.
463 return (last_vmslots - this_vmslots);
464 }
465
466
467 // MemberName support
468
469 // import java_lang_invoke_MemberName.*
470 enum {
471 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
472 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
473 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
474 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
475 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
476 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
477 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE,
478 VM_INDEX_UNINITIALIZED = java_lang_invoke_MemberName::VM_INDEX_UNINITIALIZED
479 };
480
481 Handle MethodHandles::new_MemberName(TRAPS) {
482 Handle empty;
483 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
484 if (!k->is_initialized()) k->initialize(CHECK_(empty));
485 return Handle(THREAD, k->allocate_instance(THREAD));
486 }
487
488 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) {
489 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) {
490 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
491 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
492 int mods = java_lang_reflect_Field::modifiers(target_oop);
493 klassOop k = java_lang_Class::as_klassOop(clazz);
494 int offset = instanceKlass::cast(k)->field_offset(slot);
495 init_MemberName(mname_oop, k, accessFlags_from(mods), offset);
496 } else {
497 KlassHandle receiver_limit; int decode_flags = 0;
498 methodHandle m = MethodHandles::decode_method(target_oop, receiver_limit, decode_flags);
499 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
500 init_MemberName(mname_oop, m(), do_dispatch);
501 }
502 }
503
504 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) {
505 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD)
506 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ));
507 oop vmtarget = m;
508 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet
509 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound())
510 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch
511 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value");
512 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
513 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
514 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
515 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror());
516 }
517
518 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) {
519 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ));
520 oop vmtarget = field_holder;
521 int vmindex = offset; // determines the field uniquely when combined with static bit
522 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex");
523 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
524 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
525 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
526 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror());
527 }
528
529
530 methodHandle MethodHandles::decode_MemberName(oop mname, KlassHandle& receiver_limit_result, int& decode_flags_result) {
531 methodHandle empty;
532 int flags = java_lang_invoke_MemberName::flags(mname);
533 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return empty; // not invocable
534 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname);
535 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
536 if (vmindex == VM_INDEX_UNINITIALIZED) return empty; // not resolved
537 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result);
538 oop clazz = java_lang_invoke_MemberName::clazz(mname);
539 if (clazz != NULL && java_lang_Class::is_instance(clazz)) {
540 klassOop klass = java_lang_Class::as_klassOop(clazz);
541 if (klass != NULL) receiver_limit_result = klass;
542 }
543 return m;
544 }
545
546 // convert the external string or reflective type to an internal signature
547 Symbol* MethodHandles::convert_to_signature(oop type_str, bool polymorphic, TRAPS) {
548 if (java_lang_invoke_MethodType::is_instance(type_str)) {
549 return java_lang_invoke_MethodType::as_signature(type_str, polymorphic, CHECK_NULL);
550 } else if (java_lang_Class::is_instance(type_str)) {
551 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
552 } else if (java_lang_String::is_instance(type_str)) {
553 if (polymorphic) {
554 return java_lang_String::as_symbol(type_str, CHECK_NULL);
555 } else {
556 return java_lang_String::as_symbol_or_null(type_str);
557 }
558 } else {
559 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
560 }
561 }
562
563 // An unresolved member name is a mere symbolic reference.
564 // Resolving it plants a vmtarget/vmindex in it,
565 // which refers dirctly to JVM internals.
566 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
567 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
568 #ifdef ASSERT
569 // If this assert throws, renegotiate the sentinel value used by the Java code,
570 // so that it is distinct from any valid vtable index value, and any special
571 // values defined in methodOopDesc::VtableIndexFlag.
572 // The point of the slop is to give the Java code and the JVM some room
573 // to independently specify sentinel values.
574 const int sentinel_slop = 10;
575 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop;
576 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels");
577 #endif
578 if (java_lang_invoke_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED)
579 return; // already resolved
580 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
581 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
582 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
583 int flags = java_lang_invoke_MemberName::flags(mname());
584
585 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
586 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve");
587 }
588
589 instanceKlassHandle defc;
590 {
591 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop());
592 if (defc_klassOop == NULL) return; // a primitive; no resolution possible
593 if (!Klass::cast(defc_klassOop)->oop_is_instance()) {
594 if (!Klass::cast(defc_klassOop)->oop_is_array()) return;
595 defc_klassOop = SystemDictionary::Object_klass();
596 }
597 defc = instanceKlassHandle(THREAD, defc_klassOop);
598 }
599 if (defc.is_null()) {
600 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class");
601 }
602 defc->link_class(CHECK); // possible safepoint
603
604 // convert the external string name to an internal symbol
605 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
606 if (name == NULL) return; // no such name
607 if (name == vmSymbols::class_initializer_name())
608 return; // illegal name
609
610 Handle polymorphic_method_type;
611 bool polymorphic_signature = false;
612 if ((flags & ALL_KINDS) == IS_METHOD &&
613 (defc() == SystemDictionary::MethodHandle_klass() &&
614 methodOopDesc::is_method_handle_invoke_name(name))) {
615 polymorphic_signature = true;
616 }
617
618 // convert the external string or reflective type to an internal signature
619 TempNewSymbol type = convert_to_signature(type_str(), polymorphic_signature, CHECK);
620 if (java_lang_invoke_MethodType::is_instance(type_str()) && polymorphic_signature) {
621 polymorphic_method_type = type_str; // preserve exactly
622 }
623 if (type == NULL) return; // no such signature exists in the VM
624
625 // Time to do the lookup.
626 switch (flags & ALL_KINDS) {
627 case IS_METHOD:
628 {
629 CallInfo result;
630 {
631 EXCEPTION_MARK;
632 if ((flags & JVM_ACC_STATIC) != 0) {
633 LinkResolver::resolve_static_call(result,
634 defc, name, type, KlassHandle(), false, false, THREAD);
635 } else if (defc->is_interface()) {
636 LinkResolver::resolve_interface_call(result, Handle(), defc,
637 defc, name, type, KlassHandle(), false, false, THREAD);
638 } else {
639 LinkResolver::resolve_virtual_call(result, Handle(), defc,
640 defc, name, type, KlassHandle(), false, false, THREAD);
641 }
642 if (HAS_PENDING_EXCEPTION) {
643 CLEAR_PENDING_EXCEPTION;
644 break; // go to second chance
645 }
646 }
647 methodHandle m = result.resolved_method();
648 oop vmtarget = NULL;
649 int vmindex = methodOopDesc::nonvirtual_vtable_index;
650 if (defc->is_interface()) {
651 vmindex = klassItable::compute_itable_index(m());
652 assert(vmindex >= 0, "");
653 } else if (result.has_vtable_index()) {
654 vmindex = result.vtable_index();
655 assert(vmindex >= 0, "");
656 }
657 assert(vmindex != VM_INDEX_UNINITIALIZED, "");
658 if (vmindex < 0) {
659 assert(result.is_statically_bound(), "");
660 vmtarget = m();
661 } else {
662 vmtarget = result.resolved_klass()->as_klassOop();
663 }
664 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
665 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
666 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
667 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
668 DEBUG_ONLY(KlassHandle junk1; int junk2);
669 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(),
670 "properly stored for later decoding");
671 return;
672 }
673 case IS_CONSTRUCTOR:
674 {
675 CallInfo result;
676 {
677 EXCEPTION_MARK;
678 if (name == vmSymbols::object_initializer_name()) {
679 LinkResolver::resolve_special_call(result,
680 defc, name, type, KlassHandle(), false, THREAD);
681 } else {
682 break; // will throw after end of switch
683 }
684 if (HAS_PENDING_EXCEPTION) {
685 CLEAR_PENDING_EXCEPTION;
686 return;
687 }
688 }
689 assert(result.is_statically_bound(), "");
690 methodHandle m = result.resolved_method();
691 oop vmtarget = m();
692 int vmindex = methodOopDesc::nonvirtual_vtable_index;
693 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
694 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
695 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
696 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
697 DEBUG_ONLY(KlassHandle junk1; int junk2);
698 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(),
699 "properly stored for later decoding");
700 return;
701 }
702 case IS_FIELD:
703 {
704 // This is taken from LinkResolver::resolve_field, sans access checks.
705 fieldDescriptor fd; // find_field initializes fd if found
706 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd));
707 // check if field exists; i.e., if a klass containing the field def has been selected
708 if (sel_klass.is_null()) return;
709 oop vmtarget = sel_klass->as_klassOop();
710 int vmindex = fd.offset();
711 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS);
712 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen
713 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
714 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
715 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
716 return;
717 }
718 default:
719 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
720 }
721
722 // Second chance.
723 if (polymorphic_method_type.not_null()) {
724 // Look on a non-null class loader.
725 Handle cur_class_loader;
726 const int nptypes = java_lang_invoke_MethodType::ptype_count(polymorphic_method_type());
727 for (int i = 0; i <= nptypes; i++) {
728 oop type_mirror;
729 if (i < nptypes) type_mirror = java_lang_invoke_MethodType::ptype(polymorphic_method_type(), i);
730 else type_mirror = java_lang_invoke_MethodType::rtype(polymorphic_method_type());
731 klassOop example_type = java_lang_Class::as_klassOop(type_mirror);
732 if (example_type == NULL) continue;
733 oop class_loader = Klass::cast(example_type)->class_loader();
734 if (class_loader == NULL || class_loader == cur_class_loader()) continue;
735 cur_class_loader = Handle(THREAD, class_loader);
736 methodOop m = SystemDictionary::find_method_handle_invoke(name,
737 type,
738 KlassHandle(THREAD, example_type),
739 THREAD);
740 if (HAS_PENDING_EXCEPTION) {
741 CLEAR_PENDING_EXCEPTION;
742 m = NULL;
743 // try again with a different class loader...
744 }
745 if (m != NULL &&
746 m->is_method_handle_invoke() &&
747 java_lang_invoke_MethodType::equals(polymorphic_method_type(), m->method_handle_type())) {
748 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
749 java_lang_invoke_MemberName::set_vmtarget(mname(), m);
750 java_lang_invoke_MemberName::set_vmindex(mname(), m->vtable_index());
751 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
752 return;
753 }
754 }
755 }
756 }
757
758 // Conversely, a member name which is only initialized from JVM internals
759 // may have null defc, name, and type fields.
760 // Resolving it plants a vmtarget/vmindex in it,
761 // which refers directly to JVM internals.
762 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
763 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
764 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
765 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
766 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) {
767 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
768 }
769
770 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
771 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
772 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
773 int flags = java_lang_invoke_MemberName::flags(mname());
774
775 if (suppress != 0) {
776 if (suppress & _suppress_defc) have_defc = true;
777 if (suppress & _suppress_name) have_name = true;
778 if (suppress & _suppress_type) have_type = true;
779 }
780
781 if (have_defc && have_name && have_type) return; // nothing needed
782
783 switch (flags & ALL_KINDS) {
784 case IS_METHOD:
785 case IS_CONSTRUCTOR:
786 {
787 KlassHandle receiver_limit; int decode_flags = 0;
788 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit, decode_flags);
789 if (m.is_null()) break;
790 if (!have_defc) {
791 klassOop defc = m->method_holder();
792 if (receiver_limit.not_null() && receiver_limit() != defc
793 && Klass::cast(receiver_limit())->is_subtype_of(defc))
794 defc = receiver_limit();
795 java_lang_invoke_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror());
796 }
797 if (!have_name) {
798 //not java_lang_String::create_from_symbol; let's intern member names
799 Handle name = StringTable::intern(m->name(), CHECK);
800 java_lang_invoke_MemberName::set_name(mname(), name());
801 }
802 if (!have_type) {
803 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
804 java_lang_invoke_MemberName::set_type(mname(), type());
805 }
806 return;
807 }
808 case IS_FIELD:
809 {
810 // This is taken from LinkResolver::resolve_field, sans access checks.
811 if (!vmtarget->is_klass()) break;
812 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break;
813 instanceKlassHandle defc(THREAD, (klassOop) vmtarget);
814 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
815 fieldDescriptor fd; // find_field initializes fd if found
816 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
817 break; // cannot expand
818 if (!have_defc) {
819 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
820 }
821 if (!have_name) {
822 //not java_lang_String::create_from_symbol; let's intern member names
823 Handle name = StringTable::intern(fd.name(), CHECK);
824 java_lang_invoke_MemberName::set_name(mname(), name());
825 }
826 if (!have_type) {
827 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
828 java_lang_invoke_MemberName::set_type(mname(), type());
829 }
830 return;
831 }
832 }
833 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
834 }
835
836 int MethodHandles::find_MemberNames(klassOop k,
837 Symbol* name, Symbol* sig,
838 int mflags, klassOop caller,
839 int skip, objArrayOop results) {
840 DEBUG_ONLY(No_Safepoint_Verifier nsv);
841 // this code contains no safepoints!
842
843 // %%% take caller into account!
844
845 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1;
846
847 int rfill = 0, rlimit = results->length(), rskip = skip;
848 // overflow measurement:
849 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
850
851 int match_flags = mflags;
852 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
853 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
854 bool local_only = !(search_superc | search_intfc);
855 bool classes_only = false;
856
857 if (name != NULL) {
858 if (name->utf8_length() == 0) return 0; // a match is not possible
859 }
860 if (sig != NULL) {
861 if (sig->utf8_length() == 0) return 0; // a match is not possible
862 if (sig->byte_at(0) == '(')
863 match_flags &= ~(IS_FIELD | IS_TYPE);
864 else
865 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
866 }
867
868 if ((match_flags & IS_TYPE) != 0) {
869 // NYI, and Core Reflection works quite well for this query
870 }
871
872 if ((match_flags & IS_FIELD) != 0) {
873 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
874 if (name != NULL && st.name() != name)
875 continue;
876 if (sig != NULL && st.signature() != sig)
877 continue;
878 // passed the filters
879 if (rskip > 0) {
880 --rskip;
881 } else if (rfill < rlimit) {
882 oop result = results->obj_at(rfill++);
883 if (!java_lang_invoke_MemberName::is_instance(result))
884 return -99; // caller bug!
885 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset());
886 } else if (++overflow >= overflow_limit) {
887 match_flags = 0; break; // got tired of looking at overflow
888 }
889 }
890 }
891
892 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
893 // watch out for these guys:
894 Symbol* init_name = vmSymbols::object_initializer_name();
895 Symbol* clinit_name = vmSymbols::class_initializer_name();
896 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
897 bool negate_name_test = false;
898 // fix name so that it captures the intention of IS_CONSTRUCTOR
899 if (!(match_flags & IS_METHOD)) {
900 // constructors only
901 if (name == NULL) {
902 name = init_name;
903 } else if (name != init_name) {
904 return 0; // no constructors of this method name
905 }
906 } else if (!(match_flags & IS_CONSTRUCTOR)) {
907 // methods only
908 if (name == NULL) {
909 name = init_name;
910 negate_name_test = true; // if we see the name, we *omit* the entry
911 } else if (name == init_name) {
912 return 0; // no methods of this constructor name
913 }
914 } else {
915 // caller will accept either sort; no need to adjust name
916 }
917 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
918 methodOop m = st.method();
919 Symbol* m_name = m->name();
920 if (m_name == clinit_name)
921 continue;
922 if (name != NULL && ((m_name != name) ^ negate_name_test))
923 continue;
924 if (sig != NULL && m->signature() != sig)
925 continue;
926 // passed the filters
927 if (rskip > 0) {
928 --rskip;
929 } else if (rfill < rlimit) {
930 oop result = results->obj_at(rfill++);
931 if (!java_lang_invoke_MemberName::is_instance(result))
932 return -99; // caller bug!
933 MethodHandles::init_MemberName(result, m, true);
934 } else if (++overflow >= overflow_limit) {
935 match_flags = 0; break; // got tired of looking at overflow
936 }
937 }
938 }
939
940 // return number of elements we at leasted wanted to initialize
941 return rfill + overflow;
942 }
943
944
945 // Decode this java.lang.Class object into an instanceKlass, if possible.
946 // Throw IAE if not
947 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) {
948 instanceKlassHandle empty;
949 klassOop caller = NULL;
950 if (java_lang_Class::is_instance(java_mirror_oop)) {
951 caller = java_lang_Class::as_klassOop(java_mirror_oop);
952 }
953 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) {
954 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty);
955 }
956 return instanceKlassHandle(THREAD, caller);
957 }
958
959
960
961 // Decode the vmtarget field of a method handle.
962 // Sanitize out methodOops, klassOops, and any other non-Java data.
963 // This is for debugging and reflection.
964 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) {
965 assert(java_lang_invoke_MethodHandle::is_instance(mh()), "must be a MH");
966 if (format == ETF_FORCE_DIRECT_HANDLE ||
967 format == ETF_COMPILE_DIRECT_HANDLE) {
968 // Internal function for stress testing.
969 Handle mt = java_lang_invoke_MethodHandle::type(mh());
970 int invocation_count = 10000;
971 TempNewSymbol signature = java_lang_invoke_MethodType::as_signature(mt(), true, CHECK_NULL);
972 bool omit_receiver_argument = true;
973 MethodHandleCompiler mhc(mh, vmSymbols::invoke_name(), signature, invocation_count, omit_receiver_argument, CHECK_NULL);
974 methodHandle m = mhc.compile(CHECK_NULL);
975 if (StressMethodHandleWalk && Verbose || PrintMiscellaneous) {
976 tty->print_cr("MethodHandleNatives.getTarget(%s)",
977 format == ETF_FORCE_DIRECT_HANDLE ? "FORCE_DIRECT" : "COMPILE_DIRECT");
978 if (Verbose) {
979 m->print_codes();
980 }
981 }
982 if (StressMethodHandleWalk) {
983 InterpreterOopMap mask;
984 OopMapCache::compute_one_oop_map(m, m->code_size() - 1, &mask);
985 }
986 if ((format == ETF_COMPILE_DIRECT_HANDLE ||
987 CompilationPolicy::must_be_compiled(m))
988 && !instanceKlass::cast(m->method_holder())->is_not_initialized()
989 && CompilationPolicy::can_be_compiled(m)) {
990 // Force compilation
991 CompileBroker::compile_method(m, InvocationEntryBci,
992 CompilationPolicy::policy()->initial_compile_level(),
993 methodHandle(), 0, "MethodHandleNatives.getTarget",
994 CHECK_NULL);
995 }
996 // Now wrap m in a DirectMethodHandle.
997 instanceKlassHandle dmh_klass(THREAD, SystemDictionary::DirectMethodHandle_klass());
998 Handle dmh = dmh_klass->allocate_instance_handle(CHECK_NULL);
999 JavaValue ignore_result(T_VOID);
1000 Symbol* init_name = vmSymbols::object_initializer_name();
1001 Symbol* init_sig = vmSymbols::notifyGenericMethodType_signature();
1002 JavaCalls::call_special(&ignore_result, dmh,
1003 SystemDictionaryHandles::MethodHandle_klass(), init_name, init_sig,
1004 java_lang_invoke_MethodHandle::type(mh()), CHECK_NULL);
1005 MethodHandles::init_DirectMethodHandle(dmh, m, false, CHECK_NULL);
1006 return dmh();
1007 }
1008 if (format == ETF_HANDLE_OR_METHOD_NAME) {
1009 oop target = java_lang_invoke_MethodHandle::vmtarget(mh());
1010 if (target == NULL) {
1011 return NULL; // unformed MH
1012 }
1013 klassOop tklass = target->klass();
1014 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) {
1015 return target; // target is another MH (or something else?)
1016 }
1017 }
1018 if (format == ETF_DIRECT_HANDLE) {
1019 oop target = mh();
1020 for (;;) {
1021 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
1022 return target;
1023 }
1024 if (!java_lang_invoke_MethodHandle::is_instance(target)){
1025 return NULL; // unformed MH
1026 }
1027 target = java_lang_invoke_MethodHandle::vmtarget(target);
1028 }
1029 }
1030 // cases of metadata in MH.vmtarget:
1031 // - AMH can have methodOop for static invoke with bound receiver
1032 // - DMH can have methodOop for static invoke (on variable receiver)
1033 // - DMH can have klassOop for dispatched (non-static) invoke
1034 KlassHandle receiver_limit; int decode_flags = 0;
1035 methodHandle m = decode_MethodHandle(mh(), receiver_limit, decode_flags);
1036 if (m.is_null()) return NULL;
1037 switch (format) {
1038 case ETF_REFLECT_METHOD:
1039 // same as jni_ToReflectedMethod:
1040 if (m->is_initializer()) {
1041 return Reflection::new_constructor(m, THREAD);
1042 } else {
1043 return Reflection::new_method(m, UseNewReflection, false, THREAD);
1044 }
1045
1046 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle
1047 case ETF_METHOD_NAME:
1048 {
1049 if (SystemDictionary::MemberName_klass() == NULL) break;
1050 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass());
1051 mname_klass->initialize(CHECK_NULL);
1052 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); // possible safepoint
1053 java_lang_invoke_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED);
1054 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
1055 init_MemberName(mname(), m(), do_dispatch);
1056 expand_MemberName(mname, 0, CHECK_NULL);
1057 return mname();
1058 }
1059 }
1060
1061 // Unknown format code.
1062 char msg[50];
1063 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format);
1064 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg);
1065 }
1066
1067 static const char* always_null_names[] = {
1068 "java/lang/Void",
1069 "java/lang/Null",
1070 //"java/lang/Nothing",
1071 "sun/dyn/empty/Empty",
1072 "sun/invoke/empty/Empty",
1073 NULL
1074 };
1075
1076 static bool is_always_null_type(klassOop klass) {
1077 if (klass == NULL) return false; // safety
1078 if (!Klass::cast(klass)->oop_is_instance()) return false;
1079 instanceKlass* ik = instanceKlass::cast(klass);
1080 // Must be on the boot class path:
1081 if (ik->class_loader() != NULL) return false;
1082 // Check the name.
1083 Symbol* name = ik->name();
1084 for (int i = 0; ; i++) {
1085 const char* test_name = always_null_names[i];
1086 if (test_name == NULL) break;
1087 if (name->equals(test_name))
1088 return true;
1089 }
1090 return false;
1091 }
1092
1093 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) {
1094 if (dst == NULL) return true;
1095 if (src == NULL) return (dst != SystemDictionary::Object_klass());
1096 if (src == dst || dst == SystemDictionary::Object_klass())
1097 return false; // quickest checks
1098 Klass* srck = Klass::cast(src);
1099 Klass* dstk = Klass::cast(dst);
1100 if (dstk->is_interface()) {
1101 // interface receivers can safely be viewed as untyped,
1102 // because interface calls always include a dynamic check
1103 //dstk = Klass::cast(SystemDictionary::Object_klass());
1104 return false;
1105 }
1106 if (srck->is_interface()) {
1107 // interface arguments must be viewed as untyped
1108 //srck = Klass::cast(SystemDictionary::Object_klass());
1109 return true;
1110 }
1111 if (is_always_null_type(src)) {
1112 // some source types are known to be never instantiated;
1113 // they represent references which are always null
1114 // such null references never fail to convert safely
1115 return false;
1116 }
1117 return !srck->is_subclass_of(dstk->as_klassOop());
1118 }
1119
1120 static oop object_java_mirror() {
1121 return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
1122 }
1123
1124 bool MethodHandles::is_float_fixed_reinterpretation_cast(BasicType src, BasicType dst) {
1125 if (src == T_FLOAT) return dst == T_INT;
1126 if (src == T_INT) return dst == T_FLOAT;
1127 if (src == T_DOUBLE) return dst == T_LONG;
1128 if (src == T_LONG) return dst == T_DOUBLE;
1129 return false;
1130 }
1131
1132 bool MethodHandles::same_basic_type_for_arguments(BasicType src,
1133 BasicType dst,
1134 bool raw,
1135 bool for_return) {
1136 if (for_return) {
1137 // return values can always be forgotten:
1138 if (dst == T_VOID) return true;
1139 if (src == T_VOID) return raw && (dst == T_INT);
1140 // We allow caller to receive a garbage int, which is harmless.
1141 // This trick is pulled by trusted code (see VerifyType.canPassRaw).
1142 }
1143 assert(src != T_VOID && dst != T_VOID, "should not be here");
1144 if (src == dst) return true;
1145 if (type2size[src] != type2size[dst]) return false;
1146 if (src == T_OBJECT || dst == T_OBJECT) return false;
1147 if (raw) return true; // bitwise reinterpretation; caller guarantees safety
1148 // allow reinterpretation casts for integral widening
1149 if (is_subword_type(src)) { // subwords can fit in int or other subwords
1150 if (dst == T_INT) // any subword fits in an int
1151 return true;
1152 if (src == T_BOOLEAN) // boolean fits in any subword
1153 return is_subword_type(dst);
1154 if (src == T_BYTE && dst == T_SHORT)
1155 return true; // remaining case: byte fits in short
1156 }
1157 // allow float/fixed reinterpretation casts
1158 if (is_float_fixed_reinterpretation_cast(src, dst))
1159 return true;
1160 return false;
1161 }
1162
1163 const char* MethodHandles::check_method_receiver(methodOop m,
1164 klassOop passed_recv_type) {
1165 assert(!m->is_static(), "caller resp.");
1166 if (passed_recv_type == NULL)
1167 return "receiver type is primitive";
1168 if (class_cast_needed(passed_recv_type, m->method_holder())) {
1169 Klass* formal = Klass::cast(m->method_holder());
1170 return SharedRuntime::generate_class_cast_message("receiver type",
1171 formal->external_name());
1172 }
1173 return NULL; // checks passed
1174 }
1175
1176 // Verify that m's signature can be called type-safely by a method handle
1177 // of the given method type 'mtype'.
1178 // It takes a TRAPS argument because it must perform symbol lookups.
1179 void MethodHandles::verify_method_signature(methodHandle m,
1180 Handle mtype,
1181 int first_ptype_pos,
1182 KlassHandle insert_ptype,
1183 TRAPS) {
1184 Handle mhi_type;
1185 if (m->is_method_handle_invoke()) {
1186 // use this more exact typing instead of the symbolic signature:
1187 mhi_type = Handle(THREAD, m->method_handle_type());
1188 }
1189 objArrayHandle ptypes(THREAD, java_lang_invoke_MethodType::ptypes(mtype()));
1190 int pnum = first_ptype_pos;
1191 int pmax = ptypes->length();
1192 int anum = 0; // method argument
1193 const char* err = NULL;
1194 ResourceMark rm(THREAD);
1195 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
1196 oop ptype_oop = NULL;
1197 if (ss.at_return_type()) {
1198 if (pnum != pmax)
1199 { err = "too many arguments"; break; }
1200 ptype_oop = java_lang_invoke_MethodType::rtype(mtype());
1201 } else {
1202 if (pnum >= pmax)
1203 { err = "not enough arguments"; break; }
1204 if (pnum >= 0)
1205 ptype_oop = ptypes->obj_at(pnum);
1206 else if (insert_ptype.is_null())
1207 ptype_oop = NULL;
1208 else
1209 ptype_oop = insert_ptype->java_mirror();
1210 pnum += 1;
1211 anum += 1;
1212 }
1213 KlassHandle pklass;
1214 BasicType ptype = T_OBJECT;
1215 bool have_ptype = false;
1216 // missing ptype_oop does not match any non-reference; use Object to report the error
1217 pklass = SystemDictionaryHandles::Object_klass();
1218 if (ptype_oop != NULL) {
1219 have_ptype = true;
1220 klassOop pklass_oop = NULL;
1221 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass_oop);
1222 pklass = KlassHandle(THREAD, pklass_oop);
1223 }
1224 ptype_oop = NULL; //done with this
1225 KlassHandle aklass;
1226 BasicType atype = ss.type();
1227 if (atype == T_ARRAY) atype = T_OBJECT; // fold all refs to T_OBJECT
1228 if (atype == T_OBJECT) {
1229 if (!have_ptype) {
1230 // null matches any reference
1231 continue;
1232 }
1233 if (mhi_type.is_null()) {
1234 // If we fail to resolve types at this point, we will usually throw an error.
1235 TempNewSymbol name = ss.as_symbol_or_null();
1236 if (name != NULL) {
1237 instanceKlass* mk = instanceKlass::cast(m->method_holder());
1238 Handle loader(THREAD, mk->class_loader());
1239 Handle domain(THREAD, mk->protection_domain());
1240 klassOop aklass_oop = SystemDictionary::resolve_or_null(name, loader, domain, CHECK);
1241 if (aklass_oop != NULL)
1242 aklass = KlassHandle(THREAD, aklass_oop);
1243 if (aklass.is_null() &&
1244 pklass.not_null() &&
1245 loader.is_null() &&
1246 pklass->name() == name)
1247 // accept name equivalence here, since that's the best we can do
1248 aklass = pklass;
1249 }
1250 } else {
1251 // for method handle invokers we don't look at the name in the signature
1252 oop atype_oop;
1253 if (ss.at_return_type())
1254 atype_oop = java_lang_invoke_MethodType::rtype(mhi_type());
1255 else
1256 atype_oop = java_lang_invoke_MethodType::ptype(mhi_type(), anum-1);
1257 klassOop aklass_oop = NULL;
1258 atype = java_lang_Class::as_BasicType(atype_oop, &aklass_oop);
1259 aklass = KlassHandle(THREAD, aklass_oop);
1260 }
1261 }
1262 if (!ss.at_return_type()) {
1263 err = check_argument_type_change(ptype, pklass(), atype, aklass(), anum);
1264 } else {
1265 err = check_return_type_change(atype, aklass(), ptype, pklass()); // note reversal!
1266 }
1267 if (err != NULL) break;
1268 }
1269
1270 if (err != NULL) {
1271 #ifndef PRODUCT
1272 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1273 tty->print("*** verify_method_signature failed: ");
1274 java_lang_invoke_MethodType::print_signature(mtype(), tty);
1275 tty->cr();
1276 tty->print_cr(" first_ptype_pos = %d, insert_ptype = "UINTX_FORMAT, first_ptype_pos, insert_ptype());
1277 tty->print(" Failing method: ");
1278 m->print();
1279 }
1280 #endif //PRODUCT
1281 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1282 }
1283 }
1284
1285 // Main routine for verifying the MethodHandle.type of a proposed
1286 // direct or bound-direct method handle.
1287 void MethodHandles::verify_method_type(methodHandle m,
1288 Handle mtype,
1289 bool has_bound_recv,
1290 KlassHandle bound_recv_type,
1291 TRAPS) {
1292 bool m_needs_receiver = !m->is_static();
1293
1294 const char* err = NULL;
1295
1296 int first_ptype_pos = m_needs_receiver ? 1 : 0;
1297 if (has_bound_recv) {
1298 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them
1299 if (m_needs_receiver && bound_recv_type.is_null())
1300 { err = "bound receiver is not an object"; goto die; }
1301 }
1302
1303 if (m_needs_receiver && err == NULL) {
1304 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype());
1305 if (ptypes->length() < first_ptype_pos)
1306 { err = "receiver argument is missing"; goto die; }
1307 if (has_bound_recv)
1308 err = check_method_receiver(m(), bound_recv_type->as_klassOop());
1309 else
1310 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1)));
1311 if (err != NULL) goto die;
1312 }
1313
1314 // Check the other arguments for mistypes.
1315 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK);
1316 return;
1317
1318 die:
1319 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1320 }
1321
1322 void MethodHandles::verify_vmslots(Handle mh, TRAPS) {
1323 // Verify vmslots.
1324 int check_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(mh()));
1325 if (java_lang_invoke_MethodHandle::vmslots(mh()) != check_slots) {
1326 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH");
1327 }
1328 }
1329
1330 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) {
1331 // Verify that argslot points at the given argnum.
1332 int check_slot = argument_slot(java_lang_invoke_MethodHandle::type(mh()), argnum);
1333 if (argslot != check_slot || argslot < 0) {
1334 ResourceMark rm;
1335 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d";
1336 size_t msglen = strlen(fmt) + 3*11 + 1;
1337 char* msg = NEW_RESOURCE_ARRAY(char, msglen);
1338 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot);
1339 THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
1340 }
1341 }
1342
1343 // Verify the correspondence between two method types.
1344 // Apart from the advertised changes, caller method type X must
1345 // be able to invoke the callee method Y type with no violations
1346 // of type integrity.
1347 // Return NULL if all is well, else a short error message.
1348 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end,
1349 int insert_argnum, oop insert_type,
1350 int change_argnum, oop change_type,
1351 int delete_argnum,
1352 oop dst_mtype, int dst_beg, int dst_end,
1353 bool raw) {
1354 objArrayOop src_ptypes = java_lang_invoke_MethodType::ptypes(src_mtype);
1355 objArrayOop dst_ptypes = java_lang_invoke_MethodType::ptypes(dst_mtype);
1356
1357 int src_max = src_ptypes->length();
1358 int dst_max = dst_ptypes->length();
1359
1360 if (src_end == -1) src_end = src_max;
1361 if (dst_end == -1) dst_end = dst_max;
1362
1363 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob");
1364 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob");
1365
1366 // pending actions; set to -1 when done:
1367 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum;
1368
1369 const char* err = NULL;
1370
1371 // Walk along each array of parameter types, including a virtual
1372 // NULL end marker at the end of each.
1373 for (int src_idx = src_beg, dst_idx = dst_beg;
1374 (src_idx <= src_end && dst_idx <= dst_end);
1375 src_idx++, dst_idx++) {
1376 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx);
1377 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx);
1378 bool fix_null_src_type = false;
1379
1380 // Perform requested edits.
1381 if (ins_idx == src_idx) {
1382 // note that the inserted guy is never affected by a change or deletion
1383 ins_idx = -1;
1384 src_type = insert_type;
1385 fix_null_src_type = true;
1386 --src_idx; // back up to process src type on next loop
1387 src_idx = src_end;
1388 } else {
1389 // note that the changed guy can be immediately deleted
1390 if (chg_idx == src_idx) {
1391 chg_idx = -1;
1392 assert(src_idx < src_end, "oob");
1393 src_type = change_type;
1394 fix_null_src_type = true;
1395 }
1396 if (del_idx == src_idx) {
1397 del_idx = -1;
1398 assert(src_idx < src_end, "oob");
1399 --dst_idx;
1400 continue; // rerun loop after skipping this position
1401 }
1402 }
1403
1404 if (src_type == NULL && fix_null_src_type)
1405 // explicit null in this case matches any dest reference
1406 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type);
1407
1408 // Compare the two argument types.
1409 if (src_type != dst_type) {
1410 if (src_type == NULL) return "not enough arguments";
1411 if (dst_type == NULL) return "too many arguments";
1412 err = check_argument_type_change(src_type, dst_type, dst_idx, raw);
1413 if (err != NULL) return err;
1414 }
1415 }
1416
1417 // Now compare return types also.
1418 oop src_rtype = java_lang_invoke_MethodType::rtype(src_mtype);
1419 oop dst_rtype = java_lang_invoke_MethodType::rtype(dst_mtype);
1420 if (src_rtype != dst_rtype) {
1421 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal!
1422 if (err != NULL) return err;
1423 }
1424
1425 assert(err == NULL, "");
1426 return NULL; // all is well
1427 }
1428
1429
1430 const char* MethodHandles::check_argument_type_change(BasicType src_type,
1431 klassOop src_klass,
1432 BasicType dst_type,
1433 klassOop dst_klass,
1434 int argnum,
1435 bool raw) {
1436 const char* err = NULL;
1437 const bool for_return = (argnum < 0);
1438
1439 // just in case:
1440 if (src_type == T_ARRAY) src_type = T_OBJECT;
1441 if (dst_type == T_ARRAY) dst_type = T_OBJECT;
1442
1443 // Produce some nice messages if VerifyMethodHandles is turned on:
1444 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) {
1445 if (src_type == T_OBJECT) {
1446 if (raw && is_java_primitive(dst_type))
1447 return NULL; // ref-to-prim discards ref and returns zero
1448 err = (!for_return
1449 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s"
1450 : "type mismatch: returning a %s, but caller expects primitive %s");
1451 } else if (dst_type == T_OBJECT) {
1452 err = (!for_return
1453 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s"
1454 : "type mismatch: returning a primitive %s, but caller expects %s");
1455 } else {
1456 err = (!for_return
1457 ? "type mismatch: passing a %s for method argument #%d, which expects %s"
1458 : "type mismatch: returning a %s, but caller expects %s");
1459 }
1460 } else if (src_type == T_OBJECT && dst_type == T_OBJECT &&
1461 class_cast_needed(src_klass, dst_klass)) {
1462 if (!class_cast_needed(dst_klass, src_klass)) {
1463 if (raw)
1464 return NULL; // reverse cast is OK; the MH target is trusted to enforce it
1465 err = (!for_return
1466 ? "cast required: passing a %s for method argument #%d, which expects %s"
1467 : "cast required: returning a %s, but caller expects %s");
1468 } else {
1469 err = (!for_return
1470 ? "reference mismatch: passing a %s for method argument #%d, which expects %s"
1471 : "reference mismatch: returning a %s, but caller expects %s");
1472 }
1473 } else {
1474 // passed the obstacle course
1475 return NULL;
1476 }
1477
1478 // format, format, format
1479 const char* src_name = type2name(src_type);
1480 const char* dst_name = type2name(dst_type);
1481 if (src_name == NULL) src_name = "unknown type";
1482 if (dst_name == NULL) dst_name = "unknown type";
1483 if (src_type == T_OBJECT)
1484 src_name = (src_klass != NULL) ? Klass::cast(src_klass)->external_name() : "an unresolved class";
1485 if (dst_type == T_OBJECT)
1486 dst_name = (dst_klass != NULL) ? Klass::cast(dst_klass)->external_name() : "an unresolved class";
1487
1488 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11);
1489 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1);
1490 if (!for_return) {
1491 assert(strstr(err, "%d") != NULL, "");
1492 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name);
1493 } else {
1494 assert(strstr(err, "%d") == NULL, "");
1495 jio_snprintf(msg, msglen, err, src_name, dst_name);
1496 }
1497 return msg;
1498 }
1499
1500 // Compute the depth within the stack of the given argument, i.e.,
1501 // the combined size of arguments to the right of the given argument.
1502 // For the last argument (ptypes.length-1) this will be zero.
1503 // For the first argument (0) this will be the size of all
1504 // arguments but that one. For the special number -1, this
1505 // will be the size of all arguments, including the first.
1506 // If the argument is neither -1 nor a valid argument index,
1507 // then return a negative number. Otherwise, the result
1508 // is in the range [0..vmslots] inclusive.
1509 int MethodHandles::argument_slot(oop method_type, int arg) {
1510 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type);
1511 int argslot = 0;
1512 int len = ptypes->length();
1513 if (arg < -1 || arg >= len) return -99;
1514 for (int i = len-1; i > arg; i--) {
1515 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1516 argslot += type2size[bt];
1517 }
1518 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works");
1519 return argslot;
1520 }
1521
1522 // Given a slot number, return the argument number.
1523 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) {
1524 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type);
1525 int argslot = 0;
1526 int len = ptypes->length();
1527 for (int i = len-1; i >= 0; i--) {
1528 if (query_argslot == argslot) return i;
1529 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1530 argslot += type2size[bt];
1531 }
1532 // return pseudo-arg deepest in stack:
1533 if (query_argslot == argslot) return -1;
1534 return -99; // oob slot, or splitting a double-slot arg
1535 }
1536
1537 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m,
1538 KlassHandle receiver_limit,
1539 int decode_flags,
1540 KlassHandle receiver_klass,
1541 TRAPS) {
1542 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference");
1543 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument");
1544
1545 if (!m->is_static() &&
1546 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder())))
1547 // given type does not match class of method, or receiver is null!
1548 // caller should have checked this, but let's be extra careful...
1549 return methodHandle();
1550
1551 if (receiver_limit.not_null() &&
1552 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit())))
1553 // given type is not limited to the receiver type
1554 // note that a null receiver can match any reference value, for a static method
1555 return methodHandle();
1556
1557 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) {
1558 // pre-dispatched or static method (null receiver is OK for static)
1559 return m;
1560
1561 } else if (receiver_klass.is_null()) {
1562 // null receiver value; cannot dispatch
1563 return methodHandle();
1564
1565 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) {
1566 // perform virtual dispatch
1567 int vtable_index = m->vtable_index();
1568 guarantee(vtable_index >= 0, "valid vtable index");
1569
1570 // receiver_klass might be an arrayKlassOop but all vtables start at
1571 // the same place. The cast is to avoid virtual call and assertion.
1572 // See also LinkResolver::runtime_resolve_virtual_method.
1573 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass());
1574 DEBUG_ONLY(inst->verify_vtable_index(vtable_index));
1575 methodOop m_oop = inst->method_at_vtable(vtable_index);
1576 return methodHandle(THREAD, m_oop);
1577
1578 } else {
1579 // perform interface dispatch
1580 int itable_index = klassItable::compute_itable_index(m());
1581 guarantee(itable_index >= 0, "valid itable index");
1582 instanceKlass* inst = instanceKlass::cast(receiver_klass());
1583 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD);
1584 return methodHandle(THREAD, m_oop);
1585 }
1586 }
1587
1588 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) {
1589 // Verify type.
1590 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1591 verify_method_type(m, mtype, false, KlassHandle(), CHECK);
1592
1593 // Verify vmslots.
1594 if (java_lang_invoke_MethodHandle::vmslots(mh()) != m->size_of_parameters()) {
1595 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH");
1596 }
1597 }
1598
1599 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) {
1600 // Check arguments.
1601 if (mh.is_null() || m.is_null() ||
1602 (!do_dispatch && m->is_abstract())) {
1603 THROW(vmSymbols::java_lang_InternalError());
1604 }
1605
1606 if (VerifyMethodHandles) {
1607 // The privileged code which invokes this routine should not make
1608 // a mistake about types, but it's better to verify.
1609 verify_DirectMethodHandle(mh, m, CHECK);
1610 }
1611
1612 // Finally, after safety checks are done, link to the target method.
1613 // We will follow the same path as the latter part of
1614 // InterpreterRuntime::resolve_invoke(), which first finds the method
1615 // and then decides how to populate the constant pool cache entry
1616 // that links the interpreter calls to the method. We need the same
1617 // bits, and will use the same calling sequence code.
1618
1619 int vmindex = methodOopDesc::garbage_vtable_index;
1620 Handle vmtarget;
1621
1622 instanceKlass::cast(m->method_holder())->link_class(CHECK);
1623
1624 MethodHandleEntry* me = NULL;
1625 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) {
1626 // We are simulating an invokeinterface instruction.
1627 // (We might also be simulating an invokevirtual on a miranda method,
1628 // but it is safe to treat it as an invokeinterface.)
1629 assert(!m->can_be_statically_bound(), "no final methods on interfaces");
1630 vmindex = klassItable::compute_itable_index(m());
1631 assert(vmindex >= 0, "(>=0) == do_dispatch");
1632 // Set up same bits as ConstantPoolCacheEntry::set_interface_call().
1633 vmtarget = m->method_holder(); // the interface
1634 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh);
1635 } else if (!do_dispatch || m->can_be_statically_bound()) {
1636 // We are simulating an invokestatic or invokespecial instruction.
1637 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method().
1638 vmtarget = m;
1639 // this does not help dispatch, but it will make it possible to parse this MH:
1640 vmindex = methodOopDesc::nonvirtual_vtable_index;
1641 assert(vmindex < 0, "(>=0) == do_dispatch");
1642 if (!m->is_static()) {
1643 me = MethodHandles::entry(MethodHandles::_invokespecial_mh);
1644 } else {
1645 me = MethodHandles::entry(MethodHandles::_invokestatic_mh);
1646 // Part of the semantics of a static call is an initialization barrier.
1647 // For a DMH, it is done now, when the handle is created.
1648 Klass* k = Klass::cast(m->method_holder());
1649 if (k->should_be_initialized()) {
1650 k->initialize(CHECK); // possible safepoint
1651 }
1652 }
1653 } else {
1654 // We are simulating an invokevirtual instruction.
1655 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method().
1656 // The key logic is LinkResolver::runtime_resolve_virtual_method.
1657 vmindex = m->vtable_index();
1658 vmtarget = m->method_holder();
1659 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh);
1660 }
1661
1662 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
1663
1664 java_lang_invoke_DirectMethodHandle::set_vmtarget(mh(), vmtarget());
1665 java_lang_invoke_DirectMethodHandle::set_vmindex( mh(), vmindex);
1666 DEBUG_ONLY(KlassHandle rlimit; int flags);
1667 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m,
1668 "properly stored for later decoding");
1669 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0));
1670 assert(!(actual_do_dispatch && !do_dispatch),
1671 "do not perform dispatch if !do_dispatch specified");
1672 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch");
1673 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack");
1674
1675 // Done!
1676 java_lang_invoke_MethodHandle::set_vmentry(mh(), me);
1677 }
1678
1679 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh,
1680 methodHandle m,
1681 TRAPS) {
1682 // Verify type.
1683 KlassHandle bound_recv_type;
1684 {
1685 oop receiver = java_lang_invoke_BoundMethodHandle::argument(mh());
1686 if (receiver != NULL)
1687 bound_recv_type = KlassHandle(THREAD, receiver->klass());
1688 }
1689 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1690 verify_method_type(m, mtype, true, bound_recv_type, CHECK);
1691
1692 int receiver_pos = m->size_of_parameters() - 1;
1693
1694 // Verify MH.vmargslot, which should point at the bound receiver.
1695 verify_vmargslot(mh, -1, java_lang_invoke_BoundMethodHandle::vmargslot(mh()), CHECK);
1696 //verify_vmslots(mh, CHECK);
1697
1698 // Verify vmslots.
1699 if (java_lang_invoke_MethodHandle::vmslots(mh()) != receiver_pos) {
1700 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)");
1701 }
1702 }
1703
1704 // Initialize a BMH with a receiver bound directly to a methodOop.
1705 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh,
1706 methodHandle original_m,
1707 KlassHandle receiver_limit,
1708 int decode_flags,
1709 TRAPS) {
1710 // Check arguments.
1711 if (mh.is_null() || original_m.is_null()) {
1712 THROW(vmSymbols::java_lang_InternalError());
1713 }
1714
1715 KlassHandle receiver_klass;
1716 {
1717 oop receiver_oop = java_lang_invoke_BoundMethodHandle::argument(mh());
1718 if (receiver_oop != NULL)
1719 receiver_klass = KlassHandle(THREAD, receiver_oop->klass());
1720 }
1721 methodHandle m = dispatch_decoded_method(original_m,
1722 receiver_limit, decode_flags,
1723 receiver_klass,
1724 CHECK);
1725 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); }
1726 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); }
1727
1728 int vmargslot = m->size_of_parameters() - 1;
1729 assert(java_lang_invoke_BoundMethodHandle::vmargslot(mh()) == vmargslot, "");
1730
1731 if (VerifyMethodHandles) {
1732 verify_BoundMethodHandle_with_receiver(mh, m, CHECK);
1733 }
1734
1735 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m());
1736
1737 DEBUG_ONLY(KlassHandle junk1; int junk2);
1738 assert(MethodHandles::decode_method(mh(), junk1, junk2) == m, "properly stored for later decoding");
1739 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot");
1740
1741 // Done!
1742 java_lang_invoke_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh));
1743 }
1744
1745 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
1746 bool direct_to_method, TRAPS) {
1747 ResourceMark rm;
1748 Handle ptype_handle(THREAD,
1749 java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum));
1750 KlassHandle ptype_klass;
1751 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass);
1752 int slots_pushed = type2size[ptype];
1753
1754 oop argument = java_lang_invoke_BoundMethodHandle::argument(mh());
1755
1756 const char* err = NULL;
1757
1758 switch (ptype) {
1759 case T_OBJECT:
1760 if (argument != NULL)
1761 // we must implicitly convert from the arg type to the outgoing ptype
1762 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum);
1763 break;
1764
1765 case T_ARRAY: case T_VOID:
1766 assert(false, "array, void do not appear here");
1767 default:
1768 if (ptype != T_INT && !is_subword_type(ptype)) {
1769 err = "unexpected parameter type";
1770 break;
1771 }
1772 // check subrange of Integer.value, if necessary
1773 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) {
1774 err = "bound integer argument must be of type java.lang.Integer";
1775 break;
1776 }
1777 if (ptype != T_INT) {
1778 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
1779 jint value = argument->int_field(value_offset);
1780 int vminfo = adapter_unbox_subword_vminfo(ptype);
1781 jint subword = truncate_subword_from_vminfo(value, vminfo);
1782 if (value != subword) {
1783 err = "bound subword value does not fit into the subword type";
1784 break;
1785 }
1786 }
1787 break;
1788 case T_FLOAT:
1789 case T_DOUBLE:
1790 case T_LONG:
1791 {
1792 // we must implicitly convert from the unboxed arg type to the outgoing ptype
1793 BasicType argbox = java_lang_boxing_object::basic_type(argument);
1794 if (argbox != ptype) {
1795 err = check_argument_type_change(T_OBJECT, (argument == NULL
1796 ? SystemDictionary::Object_klass()
1797 : argument->klass()),
1798 ptype, ptype_klass(), argnum);
1799 assert(err != NULL, "this must be an error");
1800 }
1801 break;
1802 }
1803 }
1804
1805 if (err == NULL) {
1806 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1807 if (direct_to_method) {
1808 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots");
1809 } else {
1810 int target_pushes = decode_MethodHandle_stack_pushes(target());
1811 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct");
1812 }
1813 }
1814
1815 if (err == NULL) {
1816 // Verify the rest of the method type.
1817 err = check_method_type_insertion(java_lang_invoke_MethodHandle::type(mh()),
1818 argnum, ptype_handle(),
1819 java_lang_invoke_MethodHandle::type(target()));
1820 }
1821
1822 if (err != NULL) {
1823 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1824 }
1825 }
1826
1827 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
1828 // Check arguments.
1829 if (mh.is_null() || target.is_null() || !java_lang_invoke_MethodHandle::is_instance(target())) {
1830 THROW(vmSymbols::java_lang_InternalError());
1831 }
1832
1833 int argslot = java_lang_invoke_BoundMethodHandle::vmargslot(mh());
1834
1835 if (VerifyMethodHandles) {
1836 int insert_after = argnum - 1;
1837 verify_vmargslot(mh, insert_after, argslot, CHECK);
1838 verify_vmslots(mh, CHECK);
1839 }
1840
1841 // Get bound type and required slots.
1842 BasicType ptype;
1843 {
1844 oop ptype_oop = java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum);
1845 ptype = java_lang_Class::as_BasicType(ptype_oop);
1846 }
1847 int slots_pushed = type2size[ptype];
1848
1849 // If (a) the target is a direct non-dispatched method handle,
1850 // or (b) the target is a dispatched direct method handle and we
1851 // are binding the receiver, cut out the middle-man.
1852 // Do this by decoding the DMH and using its methodOop directly as vmtarget.
1853 bool direct_to_method = false;
1854 if (OptimizeMethodHandles &&
1855 target->klass() == SystemDictionary::DirectMethodHandle_klass() &&
1856 (argnum != 0 || java_lang_invoke_BoundMethodHandle::argument(mh()) != NULL) &&
1857 (argnum == 0 || java_lang_invoke_DirectMethodHandle::vmindex(target()) < 0)) {
1858 KlassHandle receiver_limit; int decode_flags = 0;
1859 methodHandle m = decode_method(target(), receiver_limit, decode_flags);
1860 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); }
1861 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg.
1862 assert(java_lang_invoke_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig");
1863 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) {
1864 init_BoundMethodHandle_with_receiver(mh, m,
1865 receiver_limit, decode_flags,
1866 CHECK);
1867 return;
1868 }
1869
1870 // Even if it is not a bound receiver, we still might be able
1871 // to bind another argument and still invoke the methodOop directly.
1872 if (!(decode_flags & _dmf_does_dispatch)) {
1873 direct_to_method = true;
1874 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m());
1875 }
1876 }
1877 if (!direct_to_method)
1878 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), target());
1879
1880 if (VerifyMethodHandles) {
1881 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK);
1882 }
1883
1884 // Next question: Is this a ref, int, or long bound value?
1885 MethodHandleEntry* me = NULL;
1886 if (ptype == T_OBJECT) {
1887 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh);
1888 else me = MethodHandles::entry(_bound_ref_mh);
1889 } else if (slots_pushed == 2) {
1890 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh);
1891 else me = MethodHandles::entry(_bound_long_mh);
1892 } else if (slots_pushed == 1) {
1893 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh);
1894 else me = MethodHandles::entry(_bound_int_mh);
1895 } else {
1896 assert(false, "");
1897 }
1898
1899 // Done!
1900 java_lang_invoke_MethodHandle::set_vmentry(mh(), me);
1901 }
1902
1903 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) {
1904 char msg[200];
1905 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err);
1906 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg);
1907 }
1908
1909 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) {
1910 ResourceMark rm;
1911 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
1912 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
1913
1914 verify_vmargslot(mh, argnum, argslot, CHECK);
1915 verify_vmslots(mh, CHECK);
1916
1917 jint conv_op = adapter_conversion_op(conversion);
1918 if (!conv_op_valid(conv_op)) {
1919 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD);
1920 return;
1921 }
1922 EntryKind ek = adapter_entry_kind(conv_op);
1923
1924 int stack_move = adapter_conversion_stack_move(conversion);
1925 BasicType src = adapter_conversion_src_type(conversion);
1926 BasicType dest = adapter_conversion_dest_type(conversion);
1927 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
1928
1929 Handle argument(THREAD, java_lang_invoke_AdapterMethodHandle::argument(mh()));
1930 Handle target(THREAD, java_lang_invoke_AdapterMethodHandle::vmtarget(mh()));
1931 Handle src_mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1932 Handle dst_mtype(THREAD, java_lang_invoke_MethodHandle::type(target()));
1933 Handle arg_mtype;
1934
1935 const char* err = NULL;
1936
1937 if (err == NULL) {
1938 // Check that the correct argument is supplied, but only if it is required.
1939 switch (ek) {
1940 case _adapter_check_cast: // target type of cast
1941 case _adapter_ref_to_prim: // wrapper type from which to unbox
1942 case _adapter_spread_args: // array type to spread from
1943 if (!java_lang_Class::is_instance(argument())
1944 || java_lang_Class::is_primitive(argument()))
1945 { err = "adapter requires argument of type java.lang.Class"; break; }
1946 if (ek == _adapter_spread_args) {
1947 // Make sure it is a suitable collection type. (Array, for now.)
1948 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument()));
1949 if (!ak->oop_is_array())
1950 { err = "spread adapter requires argument representing an array class"; break; }
1951 BasicType et = arrayKlass::cast(ak->as_klassOop())->element_type();
1952 if (et != dest && stack_move <= 0)
1953 { err = "spread adapter requires array class argument of correct type"; break; }
1954 }
1955 break;
1956 case _adapter_prim_to_ref: // boxer MH to use
1957 case _adapter_collect_args: // method handle which collects the args
1958 case _adapter_fold_args: // method handle which collects the args
1959 if (!java_lang_invoke_MethodHandle::is_instance(argument()))
1960 { err = "MethodHandle adapter argument required"; break; }
1961 arg_mtype = Handle(THREAD, java_lang_invoke_MethodHandle::type(argument()));
1962 break;
1963 default:
1964 if (argument.not_null())
1965 { err = "adapter has spurious argument"; break; }
1966 break;
1967 }
1968 }
1969
1970 if (err == NULL) {
1971 // Check that the src/dest types are supplied if needed.
1972 // Also check relevant parameter or return types.
1973 switch (ek) {
1974 case _adapter_check_cast:
1975 if (src != T_OBJECT || dest != T_OBJECT) {
1976 err = "adapter requires object src/dest conversion subfields";
1977 }
1978 break;
1979 case _adapter_prim_to_prim:
1980 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) {
1981 err = "adapter requires primitive src/dest conversion subfields"; break;
1982 }
1983 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) ||
1984 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) {
1985 err = "adapter cannot convert beween floating and fixed-point"; break;
1986 }
1987 break;
1988 case _adapter_ref_to_prim:
1989 if (src != T_OBJECT || !is_java_primitive(dest)
1990 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) {
1991 err = "adapter requires primitive dest conversion subfield"; break;
1992 }
1993 break;
1994 case _adapter_prim_to_ref:
1995 if (!is_java_primitive(src) || dest != T_OBJECT) {
1996 err = "adapter requires primitive src conversion subfield"; break;
1997 }
1998 break;
1999 case _adapter_swap_args:
2000 {
2001 if (!src || !dest) {
2002 err = "adapter requires src/dest conversion subfields for swap"; break;
2003 }
2004 int src_size = type2size[src];
2005 if (src_size != type2size[dest]) {
2006 err = "adapter requires equal sizes for src/dest"; break;
2007 }
2008 int src_slot = argslot;
2009 int dest_slot = vminfo;
2010 int src_arg = argnum;
2011 int dest_arg = argument_slot_to_argnum(src_mtype(), dest_slot);
2012 verify_vmargslot(mh, dest_arg, dest_slot, CHECK);
2013 if (!(dest_slot >= src_slot + src_size) &&
2014 !(src_slot >= dest_slot + src_size)) {
2015 err = "source, destination slots must be distinct"; break;
2016 } else if (!(src_slot > dest_slot)) {
2017 err = "source of swap must be deeper in stack"; break;
2018 }
2019 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), dest_arg),
2020 java_lang_invoke_MethodType::ptype(dst_mtype(), src_arg),
2021 dest_arg);
2022 if (err == NULL)
2023 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), src_arg),
2024 java_lang_invoke_MethodType::ptype(dst_mtype(), dest_arg),
2025 src_arg);
2026 break;
2027 }
2028 case _adapter_rot_args:
2029 {
2030 if (!src || !dest) {
2031 err = "adapter requires src/dest conversion subfields for rotate"; break;
2032 }
2033 int src_slot = argslot;
2034 int limit_raw = vminfo;
2035 bool rot_down = (src_slot < limit_raw);
2036 int limit_bias = (rot_down ? MethodHandles::OP_ROT_ARGS_DOWN_LIMIT_BIAS : 0);
2037 int limit_slot = limit_raw - limit_bias;
2038 int src_arg = argnum;
2039 int limit_arg = argument_slot_to_argnum(src_mtype(), limit_slot);
2040 verify_vmargslot(mh, limit_arg, limit_slot, CHECK);
2041 if (src_slot == limit_slot) {
2042 err = "source, destination slots must be distinct"; break;
2043 }
2044 if (!rot_down) { // rotate slots up == shift arguments left
2045 // limit_slot is an inclusive lower limit
2046 assert((src_slot > limit_slot) && (src_arg < limit_arg), "");
2047 // rotate up: [limit_slot..src_slot-ss] --> [limit_slot+ss..src_slot]
2048 // that is: [src_arg+1..limit_arg] --> [src_arg..limit_arg-1]
2049 for (int i = src_arg+1; i <= limit_arg && err == NULL; i++) {
2050 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), i),
2051 java_lang_invoke_MethodType::ptype(dst_mtype(), i-1),
2052 i);
2053 }
2054 } else { // rotate slots down == shfit arguments right
2055 // limit_slot is an exclusive upper limit
2056 assert((src_slot < limit_slot - limit_bias) && (src_arg > limit_arg + limit_bias), "");
2057 // rotate down: [src_slot+ss..limit_slot) --> [src_slot..limit_slot-ss)
2058 // that is: (limit_arg..src_arg-1] --> (dst_arg+1..src_arg]
2059 for (int i = limit_arg+1; i <= src_arg-1 && err == NULL; i++) {
2060 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), i),
2061 java_lang_invoke_MethodType::ptype(dst_mtype(), i+1),
2062 i);
2063 }
2064 }
2065 if (err == NULL) {
2066 int dest_arg = (rot_down ? limit_arg+1 : limit_arg);
2067 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), src_arg),
2068 java_lang_invoke_MethodType::ptype(dst_mtype(), dest_arg),
2069 src_arg);
2070 }
2071 }
2072 break;
2073 case _adapter_spread_args:
2074 case _adapter_collect_args:
2075 case _adapter_fold_args:
2076 {
2077 bool is_spread = (ek == _adapter_spread_args);
2078 bool is_fold = (ek == _adapter_fold_args);
2079 BasicType coll_type = is_spread ? src : dest;
2080 BasicType elem_type = is_spread ? dest : src;
2081 // coll_type is type of args in collected form (or T_VOID if none)
2082 // elem_type is common type of args in spread form (or T_VOID if missing or heterogeneous)
2083 if (coll_type == 0 || elem_type == 0) {
2084 err = "adapter requires src/dest subfields for spread or collect"; break;
2085 }
2086 if (is_spread && coll_type != T_OBJECT) {
2087 err = "spread adapter requires object type for argument bundle"; break;
2088 }
2089 Handle spread_mtype = (is_spread ? dst_mtype : src_mtype);
2090 int spread_slot = argslot;
2091 int spread_arg = argnum;
2092 int slots_pushed = stack_move / stack_move_unit();
2093 int coll_slot_count = type2size[coll_type];
2094 int spread_slot_count = (is_spread ? slots_pushed : -slots_pushed) + coll_slot_count;
2095 if (is_fold) spread_slot_count = argument_slot_count(arg_mtype());
2096 if (!is_spread) {
2097 int init_slots = argument_slot_count(src_mtype());
2098 int coll_slots = argument_slot_count(arg_mtype());
2099 if (spread_slot_count > init_slots ||
2100 spread_slot_count != coll_slots) {
2101 err = "collect adapter has inconsistent arg counts"; break;
2102 }
2103 int next_slots = argument_slot_count(dst_mtype());
2104 int unchanged_slots_in = (init_slots - spread_slot_count);
2105 int unchanged_slots_out = (next_slots - coll_slot_count - (is_fold ? spread_slot_count : 0));
2106 if (unchanged_slots_in != unchanged_slots_out) {
2107 err = "collect adapter continuation has inconsistent arg counts"; break;
2108 }
2109 }
2110 }
2111 break;
2112 default:
2113 if (src != 0 || dest != 0) {
2114 err = "adapter has spurious src/dest conversion subfields"; break;
2115 }
2116 break;
2117 }
2118 }
2119
2120 if (err == NULL) {
2121 // Check the stack_move subfield.
2122 // It must always report the net change in stack size, positive or negative.
2123 int slots_pushed = stack_move / stack_move_unit();
2124 switch (ek) {
2125 case _adapter_prim_to_prim:
2126 case _adapter_ref_to_prim:
2127 case _adapter_prim_to_ref:
2128 if (slots_pushed != type2size[dest] - type2size[src]) {
2129 err = "wrong stack motion for primitive conversion";
2130 }
2131 break;
2132 case _adapter_dup_args:
2133 if (slots_pushed <= 0) {
2134 err = "adapter requires conversion subfield slots_pushed > 0";
2135 }
2136 break;
2137 case _adapter_drop_args:
2138 if (slots_pushed >= 0) {
2139 err = "adapter requires conversion subfield slots_pushed < 0";
2140 }
2141 break;
2142 case _adapter_collect_args:
2143 case _adapter_fold_args:
2144 if (slots_pushed > 2) {
2145 err = "adapter requires conversion subfield slots_pushed <= 2";
2146 }
2147 break;
2148 case _adapter_spread_args:
2149 if (slots_pushed < -1) {
2150 err = "adapter requires conversion subfield slots_pushed >= -1";
2151 }
2152 break;
2153 default:
2154 if (stack_move != 0) {
2155 err = "adapter has spurious stack_move conversion subfield";
2156 }
2157 break;
2158 }
2159 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) {
2160 err = "stack_move conversion subfield must be multiple of stack_move_unit";
2161 }
2162 }
2163
2164 if (err == NULL) {
2165 // Make sure this adapter's stack pushing is accurately recorded.
2166 int slots_pushed = stack_move / stack_move_unit();
2167 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh());
2168 int target_vmslots = java_lang_invoke_MethodHandle::vmslots(target());
2169 int target_pushes = decode_MethodHandle_stack_pushes(target());
2170 if (slots_pushed != (target_vmslots - this_vmslots)) {
2171 err = "stack_move inconsistent with previous and current MethodType vmslots";
2172 } else {
2173 int this_pushes = decode_MethodHandle_stack_pushes(mh());
2174 if (slots_pushed + target_pushes != this_pushes) {
2175 if (this_pushes == 0)
2176 err = "adapter push count not initialized";
2177 else
2178 err = "adapter push count is wrong";
2179 }
2180 }
2181
2182 // While we're at it, check that the stack motion decoder works:
2183 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
2184 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct");
2185 }
2186
2187 if (err == NULL && vminfo != 0) {
2188 switch (ek) {
2189 case _adapter_swap_args:
2190 case _adapter_rot_args:
2191 case _adapter_prim_to_ref:
2192 case _adapter_collect_args:
2193 case _adapter_fold_args:
2194 break; // OK
2195 default:
2196 err = "vminfo subfield is reserved to the JVM";
2197 }
2198 }
2199
2200 // Do additional ad hoc checks.
2201 if (err == NULL) {
2202 switch (ek) {
2203 case _adapter_retype_only:
2204 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false);
2205 break;
2206
2207 case _adapter_retype_raw:
2208 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true);
2209 break;
2210
2211 case _adapter_check_cast:
2212 {
2213 // The actual value being checked must be a reference:
2214 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), argnum),
2215 object_java_mirror(), argnum);
2216 if (err != NULL) break;
2217
2218 // The output of the cast must fit with the destination argument:
2219 Handle cast_class = argument;
2220 err = check_method_type_conversion(src_mtype(),
2221 argnum, cast_class(),
2222 dst_mtype());
2223 }
2224 break;
2225
2226 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles
2227 }
2228 }
2229
2230 if (err != NULL) {
2231 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
2232 return;
2233 }
2234
2235 }
2236
2237 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
2238 Handle argument = java_lang_invoke_AdapterMethodHandle::argument(mh());
2239 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
2240 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
2241 jint conv_op = adapter_conversion_op(conversion);
2242
2243 // adjust the adapter code to the internal EntryKind enumeration:
2244 EntryKind ek_orig = adapter_entry_kind(conv_op);
2245 EntryKind ek_opt = ek_orig; // may be optimized
2246 EntryKind ek_try; // temp
2247
2248 // Finalize the vmtarget field (Java initialized it to null).
2249 if (!java_lang_invoke_MethodHandle::is_instance(target())) {
2250 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD);
2251 return;
2252 }
2253 java_lang_invoke_AdapterMethodHandle::set_vmtarget(mh(), target());
2254
2255 int stack_move = adapter_conversion_stack_move(conversion);
2256 BasicType src = adapter_conversion_src_type(conversion);
2257 BasicType dest = adapter_conversion_dest_type(conversion);
2258 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
2259
2260 int slots_pushed = stack_move / stack_move_unit();
2261
2262 if (VerifyMethodHandles) {
2263 verify_AdapterMethodHandle(mh, argnum, CHECK);
2264 }
2265
2266 const char* err = NULL;
2267
2268 if (!conv_op_supported(conv_op)) {
2269 err = "adapter not yet implemented in the JVM";
2270 }
2271
2272 // Now it's time to finish the case analysis and pick a MethodHandleEntry.
2273 switch (ek_orig) {
2274 case _adapter_retype_only:
2275 case _adapter_retype_raw:
2276 case _adapter_check_cast:
2277 case _adapter_dup_args:
2278 case _adapter_drop_args:
2279 // these work fine via general case code
2280 break;
2281
2282 case _adapter_prim_to_prim:
2283 {
2284 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}.
2285 // And, the {float,double} -> {int,long} cases must be handled by Java.
2286 switch (type2size[src] *4+ type2size[dest]) {
2287 case 1 *4+ 1:
2288 assert(src == T_INT || is_subword_type(src), "source is not float");
2289 // Subword-related cases are int -> {boolean,byte,char,short}.
2290 ek_opt = _adapter_opt_i2i;
2291 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2292 break;
2293 case 2 *4+ 1:
2294 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) {
2295 ek_opt = _adapter_opt_l2i;
2296 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2297 } else if (src == T_DOUBLE && dest == T_FLOAT) {
2298 ek_opt = _adapter_opt_d2f;
2299 } else {
2300 goto throw_not_impl; // runs user code, hence could block
2301 }
2302 break;
2303 case 1 *4+ 2:
2304 if ((src == T_INT || is_subword_type(src)) && dest == T_LONG) {
2305 ek_opt = _adapter_opt_i2l;
2306 } else if (src == T_FLOAT && dest == T_DOUBLE) {
2307 ek_opt = _adapter_opt_f2d;
2308 } else {
2309 goto throw_not_impl; // runs user code, hence could block
2310 }
2311 break;
2312 default:
2313 goto throw_not_impl; // runs user code, hence could block
2314 break;
2315 }
2316 }
2317 break;
2318
2319 case _adapter_ref_to_prim:
2320 {
2321 switch (type2size[dest]) {
2322 case 1:
2323 ek_opt = _adapter_opt_unboxi;
2324 vminfo = adapter_unbox_subword_vminfo(dest);
2325 break;
2326 case 2:
2327 ek_opt = _adapter_opt_unboxl;
2328 break;
2329 default:
2330 goto throw_not_impl;
2331 break;
2332 }
2333 }
2334 break;
2335
2336 case _adapter_prim_to_ref:
2337 {
2338 // vminfo will be the location to insert the return value
2339 vminfo = argslot;
2340 ek_opt = _adapter_opt_collect_ref;
2341 ensure_vmlayout_field(target, CHECK);
2342 // for MethodHandleWalk:
2343 if (java_lang_invoke_AdapterMethodHandle::is_instance(argument()))
2344 ensure_vmlayout_field(argument, CHECK);
2345 if (!OptimizeMethodHandles) break;
2346 switch (type2size[src]) {
2347 case 1:
2348 ek_try = EntryKind(_adapter_opt_filter_S0_ref + argslot);
2349 if (ek_try < _adapter_opt_collect_LAST &&
2350 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2351 assert(ek_adapter_opt_collect_count(ek_try) == 1 &&
2352 ek_adapter_opt_collect_type(ek_try) == T_OBJECT, "");
2353 ek_opt = ek_try;
2354 break;
2355 }
2356 // else downgrade to variable slot:
2357 ek_opt = _adapter_opt_collect_1_ref;
2358 break;
2359 case 2:
2360 ek_try = EntryKind(_adapter_opt_collect_2_S0_ref + argslot);
2361 if (ek_try < _adapter_opt_collect_LAST &&
2362 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2363 assert(ek_adapter_opt_collect_count(ek_try) == 2 &&
2364 ek_adapter_opt_collect_type(ek_try) == T_OBJECT, "");
2365 ek_opt = ek_try;
2366 break;
2367 }
2368 // else downgrade to variable slot:
2369 ek_opt = _adapter_opt_collect_2_ref;
2370 break;
2371 default:
2372 goto throw_not_impl;
2373 break;
2374 }
2375 }
2376 break;
2377
2378 case _adapter_swap_args:
2379 case _adapter_rot_args:
2380 {
2381 int swap_slots = type2size[src];
2382 int src_slot = argslot;
2383 int dest_slot = vminfo;
2384 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1;
2385 switch (swap_slots) {
2386 case 1:
2387 ek_opt = (!rotate ? _adapter_opt_swap_1 :
2388 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down);
2389 break;
2390 case 2:
2391 ek_opt = (!rotate ? _adapter_opt_swap_2 :
2392 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down);
2393 break;
2394 default:
2395 goto throw_not_impl;
2396 break;
2397 }
2398 }
2399 break;
2400
2401 case _adapter_spread_args:
2402 {
2403 // vminfo will be the required length of the array
2404 int array_size = (slots_pushed + 1) / (type2size[dest] == 2 ? 2 : 1);
2405 vminfo = array_size;
2406 // general case
2407 switch (dest) {
2408 case T_BOOLEAN : // fall through to T_BYTE:
2409 case T_BYTE : ek_opt = _adapter_opt_spread_byte; break;
2410 case T_CHAR : ek_opt = _adapter_opt_spread_char; break;
2411 case T_SHORT : ek_opt = _adapter_opt_spread_short; break;
2412 case T_INT : ek_opt = _adapter_opt_spread_int; break;
2413 case T_LONG : ek_opt = _adapter_opt_spread_long; break;
2414 case T_FLOAT : ek_opt = _adapter_opt_spread_float; break;
2415 case T_DOUBLE : ek_opt = _adapter_opt_spread_double; break;
2416 case T_OBJECT : ek_opt = _adapter_opt_spread_ref; break;
2417 case T_VOID : if (array_size != 0) goto throw_not_impl;
2418 ek_opt = _adapter_opt_spread_ref; break;
2419 default : goto throw_not_impl;
2420 }
2421 assert(array_size == 0 || // it doesn't matter what the spreader is
2422 (ek_adapter_opt_spread_count(ek_opt) == -1 &&
2423 (ek_adapter_opt_spread_type(ek_opt) == dest ||
2424 (ek_adapter_opt_spread_type(ek_opt) == T_BYTE && dest == T_BOOLEAN))),
2425 err_msg("dest=%d ek_opt=%d", dest, ek_opt));
2426
2427 if (array_size <= 0) {
2428 // since the general case does not handle length 0, this case is required:
2429 ek_opt = _adapter_opt_spread_0;
2430 break;
2431 }
2432 if (dest == T_OBJECT) {
2433 ek_try = EntryKind(_adapter_opt_spread_1_ref - 1 + array_size);
2434 if (ek_try < _adapter_opt_spread_LAST &&
2435 ek_adapter_opt_spread_count(ek_try) == array_size) {
2436 assert(ek_adapter_opt_spread_type(ek_try) == dest, "");
2437 ek_opt = ek_try;
2438 break;
2439 }
2440 }
2441 break;
2442 }
2443 break;
2444
2445 case _adapter_collect_args:
2446 {
2447 int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument()));
2448 // vminfo will be the location to insert the return value
2449 vminfo = argslot;
2450 ensure_vmlayout_field(target, CHECK);
2451 ensure_vmlayout_field(argument, CHECK);
2452
2453 // general case:
2454 switch (dest) {
2455 default : if (!is_subword_type(dest)) goto throw_not_impl;
2456 // else fall through:
2457 case T_INT : ek_opt = _adapter_opt_collect_int; break;
2458 case T_LONG : ek_opt = _adapter_opt_collect_long; break;
2459 case T_FLOAT : ek_opt = _adapter_opt_collect_float; break;
2460 case T_DOUBLE : ek_opt = _adapter_opt_collect_double; break;
2461 case T_OBJECT : ek_opt = _adapter_opt_collect_ref; break;
2462 case T_VOID : ek_opt = _adapter_opt_collect_void; break;
2463 }
2464 assert(ek_adapter_opt_collect_slot(ek_opt) == -1 &&
2465 ek_adapter_opt_collect_count(ek_opt) == -1 &&
2466 (ek_adapter_opt_collect_type(ek_opt) == dest ||
2467 ek_adapter_opt_collect_type(ek_opt) == T_INT && is_subword_type(dest)),
2468 "");
2469
2470 if (dest == T_OBJECT && elem_slots == 1 && OptimizeMethodHandles) {
2471 // filter operation on a ref
2472 ek_try = EntryKind(_adapter_opt_filter_S0_ref + argslot);
2473 if (ek_try < _adapter_opt_collect_LAST &&
2474 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2475 assert(ek_adapter_opt_collect_count(ek_try) == elem_slots &&
2476 ek_adapter_opt_collect_type(ek_try) == dest, "");
2477 ek_opt = ek_try;
2478 break;
2479 }
2480 ek_opt = _adapter_opt_collect_1_ref;
2481 break;
2482 }
2483
2484 if (dest == T_OBJECT && elem_slots == 2 && OptimizeMethodHandles) {
2485 // filter of two arguments
2486 ek_try = EntryKind(_adapter_opt_collect_2_S0_ref + argslot);
2487 if (ek_try < _adapter_opt_collect_LAST &&
2488 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2489 assert(ek_adapter_opt_collect_count(ek_try) == elem_slots &&
2490 ek_adapter_opt_collect_type(ek_try) == dest, "");
2491 ek_opt = ek_try;
2492 break;
2493 }
2494 ek_opt = _adapter_opt_collect_2_ref;
2495 break;
2496 }
2497
2498 if (dest == T_OBJECT && OptimizeMethodHandles) {
2499 // try to use a fixed length adapter
2500 ek_try = EntryKind(_adapter_opt_collect_0_ref + elem_slots);
2501 if (ek_try < _adapter_opt_collect_LAST &&
2502 ek_adapter_opt_collect_count(ek_try) == elem_slots) {
2503 assert(ek_adapter_opt_collect_slot(ek_try) == -1 &&
2504 ek_adapter_opt_collect_type(ek_try) == dest, "");
2505 ek_opt = ek_try;
2506 break;
2507 }
2508 }
2509
2510 break;
2511 }
2512
2513 case _adapter_fold_args:
2514 {
2515 int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument()));
2516 // vminfo will be the location to insert the return value
2517 vminfo = argslot + elem_slots;
2518 ensure_vmlayout_field(target, CHECK);
2519 ensure_vmlayout_field(argument, CHECK);
2520
2521 switch (dest) {
2522 default : if (!is_subword_type(dest)) goto throw_not_impl;
2523 // else fall through:
2524 case T_INT : ek_opt = _adapter_opt_fold_int; break;
2525 case T_LONG : ek_opt = _adapter_opt_fold_long; break;
2526 case T_FLOAT : ek_opt = _adapter_opt_fold_float; break;
2527 case T_DOUBLE : ek_opt = _adapter_opt_fold_double; break;
2528 case T_OBJECT : ek_opt = _adapter_opt_fold_ref; break;
2529 case T_VOID : ek_opt = _adapter_opt_fold_void; break;
2530 }
2531 assert(ek_adapter_opt_collect_slot(ek_opt) == -1 &&
2532 ek_adapter_opt_collect_count(ek_opt) == -1 &&
2533 (ek_adapter_opt_collect_type(ek_opt) == dest ||
2534 ek_adapter_opt_collect_type(ek_opt) == T_INT && is_subword_type(dest)),
2535 "");
2536
2537 if (dest == T_OBJECT && elem_slots == 0 && OptimizeMethodHandles) {
2538 // if there are no args, just pretend it's a collect
2539 ek_opt = _adapter_opt_collect_0_ref;
2540 break;
2541 }
2542
2543 if (dest == T_OBJECT && OptimizeMethodHandles) {
2544 // try to use a fixed length adapter
2545 ek_try = EntryKind(_adapter_opt_fold_1_ref - 1 + elem_slots);
2546 if (ek_try < _adapter_opt_fold_LAST &&
2547 ek_adapter_opt_collect_count(ek_try) == elem_slots) {
2548 assert(ek_adapter_opt_collect_slot(ek_try) == -1 &&
2549 ek_adapter_opt_collect_type(ek_try) == dest, "");
2550 ek_opt = ek_try;
2551 break;
2552 }
2553 }
2554
2555 break;
2556 }
2557
2558 default:
2559 // should have failed much earlier; must be a missing case here
2560 assert(false, "incomplete switch");
2561 // and fall through:
2562
2563 throw_not_impl:
2564 if (err == NULL)
2565 err = "unknown adapter type";
2566 break;
2567 }
2568
2569 if (err == NULL && (vminfo & CONV_VMINFO_MASK) != vminfo) {
2570 // should not happen, since vminfo is used to encode arg/slot indexes < 255
2571 err = "vminfo overflow";
2572 }
2573
2574 if (err == NULL && !have_entry(ek_opt)) {
2575 err = "adapter stub for this kind of method handle is missing";
2576 }
2577
2578 if (err == NULL && ek_opt == ek_orig) {
2579 switch (ek_opt) {
2580 case _adapter_prim_to_prim:
2581 case _adapter_ref_to_prim:
2582 case _adapter_prim_to_ref:
2583 case _adapter_swap_args:
2584 case _adapter_rot_args:
2585 case _adapter_collect_args:
2586 case _adapter_fold_args:
2587 case _adapter_spread_args:
2588 // should be handled completely by optimized cases; see above
2589 err = "init_AdapterMethodHandle should not issue this";
2590 break;
2591 }
2592 }
2593
2594 if (err != NULL) {
2595 throw_InternalError_for_bad_conversion(conversion, err_msg("%s: conv_op %d ek_opt %d", err, conv_op, ek_opt), THREAD);
2596 return;
2597 }
2598
2599 // Rebuild the conversion value; maybe parts of it were changed.
2600 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo);
2601
2602 // Finalize the conversion field. (Note that it is final to Java code.)
2603 java_lang_invoke_AdapterMethodHandle::set_conversion(mh(), new_conversion);
2604
2605 if (java_lang_invoke_CountingMethodHandle::is_instance(mh())) {
2606 assert(ek_orig == _adapter_retype_only, "only one handled");
2607 ek_opt = _adapter_opt_profiling;
2608 }
2609
2610 // Done!
2611 java_lang_invoke_MethodHandle::set_vmentry(mh(), entry(ek_opt));
2612
2613 // There should be enough memory barriers on exit from native methods
2614 // to ensure that the MH is fully initialized to all threads before
2615 // Java code can publish it in global data structures.
2616 }
2617
2618 void MethodHandles::ensure_vmlayout_field(Handle target, TRAPS) {
2619 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(target()));
2620 Handle mtform(THREAD, java_lang_invoke_MethodType::form(mtype()));
2621 if (mtform.is_null()) { THROW(vmSymbols::java_lang_InternalError()); }
2622 if (java_lang_invoke_MethodTypeForm::vmlayout_offset_in_bytes() > 0) {
2623 if (java_lang_invoke_MethodTypeForm::vmlayout(mtform()) == NULL) {
2624 // fill it in
2625 Handle erased_mtype(THREAD, java_lang_invoke_MethodTypeForm::erasedType(mtform()));
2626 TempNewSymbol erased_signature
2627 = java_lang_invoke_MethodType::as_signature(erased_mtype(), /*intern:*/true, CHECK);
2628 methodOop cookie
2629 = SystemDictionary::find_method_handle_invoke(vmSymbols::invokeExact_name(),
2630 erased_signature,
2631 SystemDictionaryHandles::Object_klass(),
2632 THREAD);
2633 java_lang_invoke_MethodTypeForm::init_vmlayout(mtform(), cookie);
2634 }
2635 }
2636 assert(java_lang_invoke_MethodTypeForm::vmslots(mtform()) == argument_slot_count(mtype()), "must agree");
2637 }
2638
2639 #ifdef ASSERT
2640
2641 extern "C"
2642 void print_method_handle(oop mh);
2643
2644 static void stress_method_handle_walk_impl(Handle mh, TRAPS) {
2645 if (StressMethodHandleWalk) {
2646 // Exercise the MethodHandleWalk code in various ways and validate
2647 // the resulting method oop. Some of these produce output so they
2648 // are guarded under Verbose.
2649 ResourceMark rm;
2650 HandleMark hm;
2651 if (Verbose) {
2652 print_method_handle(mh());
2653 }
2654 TempNewSymbol name = SymbolTable::new_symbol("invoke", CHECK);
2655 Handle mt = java_lang_invoke_MethodHandle::type(mh());
2656 TempNewSymbol signature = java_lang_invoke_MethodType::as_signature(mt(), true, CHECK);
2657 MethodHandleCompiler mhc(mh, name, signature, 10000, false, CHECK);
2658 methodHandle m = mhc.compile(CHECK);
2659 if (Verbose) {
2660 m->print_codes();
2661 }
2662 InterpreterOopMap mask;
2663 OopMapCache::compute_one_oop_map(m, m->code_size() - 1, &mask);
2664 // compile to object code if -Xcomp or WizardMode
2665 if ((WizardMode ||
2666 CompilationPolicy::must_be_compiled(m))
2667 && !instanceKlass::cast(m->method_holder())->is_not_initialized()
2668 && CompilationPolicy::can_be_compiled(m)) {
2669 // Force compilation
2670 CompileBroker::compile_method(m, InvocationEntryBci,
2671 CompilationPolicy::policy()->initial_compile_level(),
2672 methodHandle(), 0, "StressMethodHandleWalk",
2673 CHECK);
2674 }
2675 }
2676 }
2677
2678 static void stress_method_handle_walk(Handle mh, TRAPS) {
2679 stress_method_handle_walk_impl(mh, THREAD);
2680 if (HAS_PENDING_EXCEPTION) {
2681 oop ex = PENDING_EXCEPTION;
2682 CLEAR_PENDING_EXCEPTION;
2683 tty->print("StressMethodHandleWalk: ");
2684 java_lang_Throwable::print(ex, tty);
2685 tty->cr();
2686 }
2687 }
2688 #else
2689
2690 static void stress_method_handle_walk(Handle mh, TRAPS) {}
2691
2692 #endif
2693
2694 //
2695 // Here are the native methods on sun.invoke.MethodHandleImpl.
2696 // They are the private interface between this JVM and the HotSpot-specific
2697 // Java code that implements JSR 292 method handles.
2698 //
2699 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
2700 // that intrinsic (non-JNI) native methods are defined in HotSpot.
2701 //
2702
2703 // direct method handles for invokestatic or invokespecial
2704 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller);
2705 JVM_ENTRY(void, MHN_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2706 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) {
2707 ResourceMark rm; // for error messages
2708
2709 // This is the guy we are initializing:
2710 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2711 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2712
2713 // Early returns out of this method leave the DMH in an unfinished state.
2714 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2715
2716 // which method are we really talking about?
2717 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2718 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2719 if (java_lang_invoke_MemberName::is_instance(target()) &&
2720 java_lang_invoke_MemberName::vmindex(target()) == VM_INDEX_UNINITIALIZED) {
2721 MethodHandles::resolve_MemberName(target, CHECK);
2722 }
2723
2724 KlassHandle receiver_limit; int decode_flags = 0;
2725 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags);
2726 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); }
2727
2728 // The trusted Java code that calls this method should already have performed
2729 // access checks on behalf of the given caller. But, we can verify this.
2730 if (VerifyMethodHandles && caller_jh != NULL) {
2731 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)));
2732 // If this were a bytecode, the first access check would be against
2733 // the "reference class" mentioned in the CONSTANT_Methodref.
2734 // We don't know at this point which class that was, and if we
2735 // check against m.method_holder we might get the wrong answer.
2736 // So we just make sure to handle this check when the resolution
2737 // happens, when we call resolve_MemberName.
2738 //
2739 // (A public class can inherit public members from private supers,
2740 // and it would be wrong to check access against the private super
2741 // if the original symbolic reference was against the public class.)
2742 //
2743 // If there were a bytecode, the next step would be to lookup the method
2744 // in the reference class, then then check the method's access bits.
2745 // Emulate LinkResolver::check_method_accessability.
2746 klassOop resolved_klass = m->method_holder();
2747 if (!Reflection::verify_field_access(caller->as_klassOop(),
2748 resolved_klass, resolved_klass,
2749 m->access_flags(),
2750 true)) {
2751 // %%% following cutout belongs in Reflection::verify_field_access?
2752 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(),
2753 resolved_klass, THREAD);
2754 if (!same_pm) {
2755 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string());
2756 }
2757 }
2758 }
2759
2760 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK);
2761 stress_method_handle_walk(mh, CHECK);
2762 }
2763 JVM_END
2764
2765 // bound method handles
2766 JVM_ENTRY(void, MHN_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2767 jobject target_jh, int argnum)) {
2768 ResourceMark rm; // for error messages
2769
2770 // This is the guy we are initializing:
2771 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2772 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2773
2774 // Early returns out of this method leave the BMH in an unfinished state.
2775 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2776
2777 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2778 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2779
2780 if (!java_lang_invoke_MethodHandle::is_instance(target())) {
2781 // Target object is a reflective method. (%%% Do we need this alternate path?)
2782 Untested("init_BMH of non-MH");
2783 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); }
2784 KlassHandle receiver_limit; int decode_flags = 0;
2785 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags);
2786 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m,
2787 receiver_limit,
2788 decode_flags,
2789 CHECK);
2790 } else {
2791 // Build a BMH on top of a DMH or another BMH:
2792 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK);
2793 }
2794
2795 if (StressMethodHandleWalk) {
2796 if (mh->klass() == SystemDictionary::BoundMethodHandle_klass())
2797 stress_method_handle_walk(mh, CHECK);
2798 // else don't, since the subclass has not yet initialized its own fields
2799 }
2800 }
2801 JVM_END
2802
2803 // adapter method handles
2804 JVM_ENTRY(void, MHN_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2805 jobject target_jh, int argnum)) {
2806 // This is the guy we are initializing:
2807 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2808 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2809 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2810 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2811
2812 // Early returns out of this method leave the AMH in an unfinished state.
2813 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2814
2815 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK);
2816 stress_method_handle_walk(mh, CHECK);
2817 }
2818 JVM_END
2819
2820 // method type forms
2821 JVM_ENTRY(void, MHN_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) {
2822 if (erased_jh == NULL) return;
2823 if (TraceMethodHandles) {
2824 tty->print("creating MethodType form ");
2825 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH!
2826 // call Object.toString()
2827 Symbol* name = vmSymbols::toString_name();
2828 Symbol* sig = vmSymbols::void_string_signature();
2829 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh)));
2830 JavaValue result(T_OBJECT);
2831 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig,
2832 &args, CHECK);
2833 Handle str(THREAD, (oop)result.get_jobject());
2834 java_lang_String::print(str, tty);
2835 }
2836 tty->cr();
2837 }
2838 }
2839 JVM_END
2840
2841 // debugging and reflection
2842 JVM_ENTRY(jobject, MHN_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) {
2843 Handle mh(THREAD, JNIHandles::resolve(mh_jh));
2844 if (!java_lang_invoke_MethodHandle::is_instance(mh())) {
2845 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
2846 }
2847 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL);
2848 return JNIHandles::make_local(THREAD, target);
2849 }
2850 JVM_END
2851
2852 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
2853 switch (which) {
2854 case MethodHandles::GC_JVM_PUSH_LIMIT:
2855 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF,
2856 "MethodHandlePushLimit parameter must be in valid range");
2857 return MethodHandlePushLimit;
2858 case MethodHandles::GC_JVM_STACK_MOVE_UNIT:
2859 // return number of words per slot, signed according to stack direction
2860 return MethodHandles::stack_move_unit();
2861 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK:
2862 return MethodHandles::adapter_conversion_ops_supported_mask();
2863 case MethodHandles::GC_COUNT_GWT:
2864 #ifdef COMPILER2
2865 return true;
2866 #else
2867 return false;
2868 #endif
2869 }
2870 return 0;
2871 }
2872 JVM_END
2873
2874 #ifndef PRODUCT
2875 #define EACH_NAMED_CON(template) \
2876 /* hold back this one until JDK stabilizes */ \
2877 /* template(MethodHandles,GC_JVM_PUSH_LIMIT) */ \
2878 /* hold back this one until JDK stabilizes */ \
2879 /* template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) */ \
2880 /* hold back this one until JDK stabilizes */ \
2881 /* template(MethodHandles,GC_OP_ROT_ARGS_DOWN_LIMIT_BIAS) */ \
2882 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \
2883 template(MethodHandles,ETF_DIRECT_HANDLE) \
2884 template(MethodHandles,ETF_METHOD_NAME) \
2885 template(MethodHandles,ETF_REFLECT_METHOD) \
2886 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
2887 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
2888 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
2889 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
2890 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
2891 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
2892 template(java_lang_invoke_MemberName,VM_INDEX_UNINITIALIZED) \
2893 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_ONLY) \
2894 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_RAW) \
2895 template(java_lang_invoke_AdapterMethodHandle,OP_CHECK_CAST) \
2896 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_PRIM) \
2897 template(java_lang_invoke_AdapterMethodHandle,OP_REF_TO_PRIM) \
2898 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_REF) \
2899 template(java_lang_invoke_AdapterMethodHandle,OP_SWAP_ARGS) \
2900 template(java_lang_invoke_AdapterMethodHandle,OP_ROT_ARGS) \
2901 template(java_lang_invoke_AdapterMethodHandle,OP_DUP_ARGS) \
2902 template(java_lang_invoke_AdapterMethodHandle,OP_DROP_ARGS) \
2903 template(java_lang_invoke_AdapterMethodHandle,OP_COLLECT_ARGS) \
2904 template(java_lang_invoke_AdapterMethodHandle,OP_SPREAD_ARGS) \
2905 /* hold back this one until JDK stabilizes */ \
2906 /*template(java_lang_invoke_AdapterMethodHandle,CONV_OP_LIMIT)*/ \
2907 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_MASK) \
2908 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_MASK) \
2909 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_SHIFT) \
2910 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_SHIFT) \
2911 template(java_lang_invoke_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \
2912 template(java_lang_invoke_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \
2913 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \
2914 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \
2915 /*end*/
2916
2917 #define ONE_PLUS(scope,value) 1+
2918 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0;
2919 #define VALUE_COMMA(scope,value) scope::value,
2920 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 };
2921 #define STRING_NULL(scope,value) #value "\0"
2922 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) };
2923
2924 #undef ONE_PLUS
2925 #undef VALUE_COMMA
2926 #undef STRING_NULL
2927 #undef EACH_NAMED_CON
2928 #endif
2929
2930 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
2931 #ifndef PRODUCT
2932 if (which >= 0 && which < con_value_count) {
2933 int con = con_values[which];
2934 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
2935 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
2936 const char* str = &con_names[0];
2937 for (int i = 0; i < which; i++)
2938 str += strlen(str) + 1; // skip name and null
2939 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
2940 box->obj_at_put(0, name);
2941 }
2942 return con;
2943 }
2944 #endif
2945 return 0;
2946 }
2947 JVM_END
2948
2949 // void init(MemberName self, AccessibleObject ref)
2950 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
2951 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
2952 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2953 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2954 oop target_oop = JNIHandles::resolve_non_null(target_jh);
2955 MethodHandles::init_MemberName(mname(), target_oop);
2956 }
2957 JVM_END
2958
2959 // void expand(MemberName self)
2960 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
2961 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
2962 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2963 MethodHandles::expand_MemberName(mname, 0, CHECK);
2964 }
2965 JVM_END
2966
2967 // void resolve(MemberName self, Class<?> caller)
2968 JVM_ENTRY(void, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
2969 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
2970 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2971
2972 // The trusted Java code that calls this method should already have performed
2973 // access checks on behalf of the given caller. But, we can verify this.
2974 if (VerifyMethodHandles && caller_jh != NULL) {
2975 klassOop reference_klass = java_lang_Class::as_klassOop(java_lang_invoke_MemberName::clazz(mname()));
2976 if (reference_klass != NULL) {
2977 // Emulate LinkResolver::check_klass_accessability.
2978 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh));
2979 if (!Reflection::verify_class_access(caller,
2980 reference_klass,
2981 true)) {
2982 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name());
2983 }
2984 }
2985 }
2986
2987 MethodHandles::resolve_MemberName(mname, CHECK);
2988 }
2989 JVM_END
2990
2991 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
2992 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
2993 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
2994 jclass clazz_jh, jstring name_jh, jstring sig_jh,
2995 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
2996 if (clazz_jh == NULL || results_jh == NULL) return -1;
2997 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)));
2998
2999 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
3000 if (results.is_null() || !results->is_objArray()) return -1;
3001
3002 TempNewSymbol name = NULL;
3003 TempNewSymbol sig = NULL;
3004 if (name_jh != NULL) {
3005 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
3006 if (name == NULL) return 0; // a match is not possible
3007 }
3008 if (sig_jh != NULL) {
3009 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
3010 if (sig == NULL) return 0; // a match is not possible
3011 }
3012
3013 KlassHandle caller;
3014 if (caller_jh != NULL) {
3015 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
3016 if (!java_lang_Class::is_instance(caller_oop)) return -1;
3017 caller = KlassHandle(THREAD, java_lang_Class::as_klassOop(caller_oop));
3018 }
3019
3020 if (name != NULL && sig != NULL && results.not_null()) {
3021 // try a direct resolve
3022 // %%% TO DO
3023 }
3024
3025 int res = MethodHandles::find_MemberNames(k(), name, sig, mflags,
3026 caller(), skip, results());
3027 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
3028 return res;
3029 }
3030 JVM_END
3031
3032 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
3033 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
3034 Handle target (THREAD, JNIHandles::resolve(target_jh));
3035 {
3036 // Walk all nmethods depending on this call site.
3037 MutexLocker mu(Compile_lock, thread);
3038 Universe::flush_dependents_on(call_site, target);
3039 }
3040 java_lang_invoke_CallSite::set_target(call_site(), target());
3041 }
3042 JVM_END
3043
3044 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
3045 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
3046 Handle target (THREAD, JNIHandles::resolve(target_jh));
3047 {
3048 // Walk all nmethods depending on this call site.
3049 MutexLocker mu(Compile_lock, thread);
3050 Universe::flush_dependents_on(call_site, target);
3051 }
3052 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
3053 }
3054 JVM_END
3055
3056 methodOop MethodHandles::resolve_raise_exception_method(TRAPS) {
3057 if (_raise_exception_method != NULL) {
3058 // no need to do it twice
3059 return raise_exception_method();
3060 }
3061 // LinkResolver::resolve_invokedynamic can reach this point
3062 // because an invokedynamic has failed very early (7049415)
3063 KlassHandle MHN_klass = SystemDictionaryHandles::MethodHandleNatives_klass();
3064 if (MHN_klass.not_null()) {
3065 TempNewSymbol raiseException_name = SymbolTable::new_symbol("raiseException", CHECK_NULL);
3066 TempNewSymbol raiseException_sig = SymbolTable::new_symbol("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK_NULL);
3067 methodOop raiseException_method = instanceKlass::cast(MHN_klass->as_klassOop())
3068 ->find_method(raiseException_name, raiseException_sig);
3069 if (raiseException_method != NULL && raiseException_method->is_static()) {
3070 return raiseException_method;
3071 }
3072 }
3073 // not found; let the caller deal with it
3074 return NULL;
3075 }
3076 void MethodHandles::raise_exception(int code, oop actual, oop required, TRAPS) {
3077 methodOop raiseException_method = resolve_raise_exception_method(CHECK);
3078 if (raiseException_method != NULL &&
3079 instanceKlass::cast(raiseException_method->method_holder())->is_not_initialized()) {
3080 instanceKlass::cast(raiseException_method->method_holder())->initialize(CHECK);
3081 // it had better be resolved by now, or maybe JSR 292 failed to load
3082 raiseException_method = raise_exception_method();
3083 }
3084 if (raiseException_method == NULL) {
3085 THROW_MSG(vmSymbols::java_lang_InternalError(), "no raiseException method");
3086 }
3087 JavaCallArguments args;
3088 args.push_int(code);
3089 args.push_oop(actual);
3090 args.push_oop(required);
3091 JavaValue result(T_VOID);
3092 JavaCalls::call(&result, raiseException_method, &args, CHECK);
3093 }
3094
3095 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) {
3096 TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL);
3097 THROW_MSG_NULL(UOE_name, "MethodHandle.invoke cannot be invoked reflectively");
3098 return NULL;
3099 }
3100 JVM_END
3101
3102 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) {
3103 TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL);
3104 THROW_MSG_NULL(UOE_name, "MethodHandle.invokeExact cannot be invoked reflectively");
3105 return NULL;
3106 }
3107 JVM_END
3108
3109
3110 /// JVM_RegisterMethodHandleMethods
3111
3112 #undef CS // Solaris builds complain
3113
3114 #define LANG "Ljava/lang/"
3115 #define JLINV "Ljava/lang/invoke/"
3116
3117 #define OBJ LANG"Object;"
3118 #define CLS LANG"Class;"
3119 #define STRG LANG"String;"
3120 #define CS JLINV"CallSite;"
3121 #define MT JLINV"MethodType;"
3122 #define MH JLINV"MethodHandle;"
3123 #define MEM JLINV"MemberName;"
3124 #define AMH JLINV"AdapterMethodHandle;"
3125 #define BMH JLINV"BoundMethodHandle;"
3126 #define DMH JLINV"DirectMethodHandle;"
3127
3128 #define CC (char*) /*cast a literal from (const char*)*/
3129 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
3130
3131 // These are the native methods on java.lang.invoke.MethodHandleNatives.
3132 static JNINativeMethod methods[] = {
3133 // void init(MemberName self, AccessibleObject ref)
3134 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHN_init_AMH)},
3135 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHN_init_BMH)},
3136 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHN_init_DMH)},
3137 {CC"init", CC"("MT")V", FN_PTR(MHN_init_MT)},
3138 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
3139 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
3140 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHN_resolve_Mem)},
3141 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHN_getTarget)},
3142 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
3143 // static native int getNamedCon(int which, Object[] name)
3144 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
3145 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
3146 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
3147 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}
3148 };
3149
3150 static JNINativeMethod call_site_methods[] = {
3151 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
3152 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)}
3153 };
3154
3155 static JNINativeMethod invoke_methods[] = {
3156 // void init(MemberName self, AccessibleObject ref)
3157 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
3158 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
3159 };
3160
3161 // This one function is exported, used by NativeLookup.
3162
3163 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
3164 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK");
3165
3166 if (!EnableInvokeDynamic) {
3167 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
3168 return; // bind nothing
3169 }
3170
3171 assert(!MethodHandles::enabled(), "must not be enabled");
3172 bool enable_MH = true;
3173
3174 {
3175 ThreadToNativeFromVM ttnfv(thread);
3176 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod));
3177 if (!env->ExceptionOccurred()) {
3178 const char* L_MH_name = (JLINV "MethodHandle");
3179 const char* MH_name = L_MH_name+1;
3180 jclass MH_class = env->FindClass(MH_name);
3181 status = env->RegisterNatives(MH_class, invoke_methods, sizeof(invoke_methods)/sizeof(JNINativeMethod));
3182 }
3183 if (env->ExceptionOccurred()) {
3184 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
3185 enable_MH = false;
3186 env->ExceptionClear();
3187 }
3188
3189 status = env->RegisterNatives(MHN_class, call_site_methods, sizeof(call_site_methods)/sizeof(JNINativeMethod));
3190 if (env->ExceptionOccurred()) {
3191 // Exception is okay until 7087357
3192 env->ExceptionClear();
3193 }
3194 }
3195
3196 if (enable_MH) {
3197 methodOop raiseException_method = MethodHandles::resolve_raise_exception_method(CHECK);
3198 if (raiseException_method != NULL) {
3199 MethodHandles::set_raise_exception_method(raiseException_method);
3200 } else {
3201 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
3202 enable_MH = false;
3203 }
3204 }
3205
3206 if (enable_MH) {
3207 MethodHandles::generate_adapters();
3208 MethodHandles::set_enabled(true);
3209 }
3210 }
3211 JVM_END