Sat, 10 Sep 2011 17:29:02 -0700
7086585: make Java field injection more flexible
Reviewed-by: jrose, twisti, kvn, coleenp
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 */
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"
40 /*
41 * JSR 292 reference implementation: method handles
42 */
44 bool MethodHandles::_enabled = false; // set true after successful native linkage
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",
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",
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",
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",
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",
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",
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",
161 "adapter_opt_profiling",
163 NULL
164 };
166 // Adapters.
167 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
169 jobject MethodHandles::_raise_exception_method;
171 address MethodHandles::_adapter_return_handlers[CONV_TYPE_MASK+1];
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
193 //------------------------------------------------------------------------------
194 // MethodHandles::generate_adapters
195 //
196 void MethodHandles::generate_adapters() {
197 #ifdef TARGET_ARCH_NYI_6939861
198 if (FLAG_IS_DEFAULT(UseRicochetFrames)) UseRicochetFrames = false;
199 #endif
200 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
202 assert(_adapter_code == NULL, "generate only once");
204 ResourceMark rm;
205 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
206 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
207 if (_adapter_code == NULL)
208 vm_exit_out_of_memory(adapter_code_size, "CodeCache: no room for MethodHandles adapters");
209 CodeBuffer code(_adapter_code);
210 MethodHandlesAdapterGenerator g(&code);
211 g.generate();
212 }
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 }
230 #ifdef TARGET_ARCH_NYI_6939861
231 // these defs belong in methodHandles_<arch>.cpp
232 frame MethodHandles::ricochet_frame_sender(const frame& fr, RegisterMap *map) {
233 ShouldNotCallThis();
234 return fr;
235 }
236 void MethodHandles::ricochet_frame_oops_do(const frame& fr, OopClosure* f, const RegisterMap* reg_map) {
237 ShouldNotCallThis();
238 }
239 #endif //TARGET_ARCH_NYI_6939861
242 //------------------------------------------------------------------------------
243 // MethodHandles::ek_supported
244 //
245 bool MethodHandles::ek_supported(MethodHandles::EntryKind ek) {
246 MethodHandles::EntryKind ek_orig = MethodHandles::ek_original_kind(ek);
247 switch (ek_orig) {
248 case _adapter_unused_13:
249 return false; // not defined yet
250 case _adapter_prim_to_ref:
251 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF);
252 case _adapter_collect_args:
253 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS);
254 case _adapter_fold_args:
255 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS);
256 case _adapter_opt_return_any:
257 return UseRicochetFrames;
258 #ifdef TARGET_ARCH_NYI_6939861
259 // ports before 6939861 supported only three kinds of spread ops
260 case _adapter_spread_args:
261 // restrict spreads to three kinds:
262 switch (ek) {
263 case _adapter_opt_spread_0:
264 case _adapter_opt_spread_1:
265 case _adapter_opt_spread_more:
266 break;
267 default:
268 return false;
269 break;
270 }
271 break;
272 #endif //TARGET_ARCH_NYI_6939861
273 }
274 return true;
275 }
278 void MethodHandles::set_enabled(bool z) {
279 if (_enabled != z) {
280 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
281 _enabled = z;
282 }
283 }
285 // Note: A method which does not have a TRAPS argument cannot block in the GC
286 // or throw exceptions. Such methods are used in this file to do something quick
287 // and local, like parse a data structure. For speed, such methods work on plain
288 // oops, not handles. Trapping methods uniformly operate on handles.
290 methodHandle MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype,
291 KlassHandle& receiver_limit_result, int& decode_flags_result) {
292 if (vmtarget == NULL) return methodHandle();
293 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding");
294 if (vmindex < 0) {
295 // this DMH performs no dispatch; it is directly bound to a methodOop
296 // A MemberName may either be directly bound to a methodOop,
297 // or it may use the klass/index form; both forms mean the same thing.
298 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result);
299 if ((decode_flags_result & _dmf_has_receiver) != 0
300 && java_lang_invoke_MethodType::is_instance(mtype)) {
301 // Extract receiver type restriction from mtype.ptypes[0].
302 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype);
303 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0);
304 if (java_lang_Class::is_instance(ptype0))
305 receiver_limit_result = java_lang_Class::as_klassOop(ptype0);
306 }
307 if (vmindex == methodOopDesc::nonvirtual_vtable_index) {
308 // this DMH can be an "invokespecial" version
309 decode_flags_result &= ~_dmf_does_dispatch;
310 } else {
311 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?");
312 }
313 return m;
314 } else {
315 assert(vmtarget->is_klass(), "must be class or interface");
316 decode_flags_result |= MethodHandles::_dmf_does_dispatch;
317 decode_flags_result |= MethodHandles::_dmf_has_receiver;
318 receiver_limit_result = (klassOop)vmtarget;
319 Klass* tk = Klass::cast((klassOop)vmtarget);
320 if (tk->is_interface()) {
321 // an itable linkage is <interface, itable index>
322 decode_flags_result |= MethodHandles::_dmf_from_interface;
323 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex);
324 } else {
325 if (!tk->oop_is_instance())
326 tk = instanceKlass::cast(SystemDictionary::Object_klass());
327 return ((instanceKlass*)tk)->method_at_vtable(vmindex);
328 }
329 }
330 }
332 // MemberName and DirectMethodHandle have the same linkage to the JVM internals.
333 // (MemberName is the non-operational name used for queries and setup.)
335 methodHandle MethodHandles::decode_DirectMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
336 oop vmtarget = java_lang_invoke_DirectMethodHandle::vmtarget(mh);
337 int vmindex = java_lang_invoke_DirectMethodHandle::vmindex(mh);
338 oop mtype = java_lang_invoke_DirectMethodHandle::type(mh);
339 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result);
340 }
342 methodHandle MethodHandles::decode_BoundMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
343 assert(java_lang_invoke_BoundMethodHandle::is_instance(mh), "");
344 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), "");
345 for (oop bmh = mh;;) {
346 // Bound MHs can be stacked to bind several arguments.
347 oop target = java_lang_invoke_MethodHandle::vmtarget(bmh);
348 if (target == NULL) return methodHandle();
349 decode_flags_result |= MethodHandles::_dmf_binds_argument;
350 klassOop tk = target->klass();
351 if (tk == SystemDictionary::BoundMethodHandle_klass()) {
352 bmh = target;
353 continue;
354 } else {
355 if (java_lang_invoke_MethodHandle::is_subclass(tk)) {
356 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH");
357 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
358 } else {
359 // Optimized case: binding a receiver to a non-dispatched DMH
360 // short-circuits directly to the methodOop.
361 // (It might be another argument besides a receiver also.)
362 assert(target->is_method(), "must be a simple method");
363 decode_flags_result |= MethodHandles::_dmf_binds_method;
364 methodOop m = (methodOop) target;
365 if (!m->is_static())
366 decode_flags_result |= MethodHandles::_dmf_has_receiver;
367 return m;
368 }
369 }
370 }
371 }
373 methodHandle MethodHandles::decode_AdapterMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
374 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), "");
375 for (oop amh = mh;;) {
376 // Adapter MHs can be stacked to convert several arguments.
377 int conv_op = adapter_conversion_op(java_lang_invoke_AdapterMethodHandle::conversion(amh));
378 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK;
379 oop target = java_lang_invoke_MethodHandle::vmtarget(amh);
380 if (target == NULL) return methodHandle();
381 klassOop tk = target->klass();
382 if (tk == SystemDictionary::AdapterMethodHandle_klass()) {
383 amh = target;
384 continue;
385 } else {
386 // must be a BMH (which will bind some more arguments) or a DMH (for the final call)
387 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
388 }
389 }
390 }
392 methodHandle MethodHandles::decode_MethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
393 if (mh == NULL) return methodHandle();
394 klassOop mhk = mh->klass();
395 assert(java_lang_invoke_MethodHandle::is_subclass(mhk), "must be a MethodHandle");
396 if (mhk == SystemDictionary::DirectMethodHandle_klass()) {
397 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result);
398 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) {
399 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
400 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) {
401 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result);
402 } else if (java_lang_invoke_BoundMethodHandle::is_subclass(mhk)) {
403 // could be a JavaMethodHandle (but not an adapter MH)
404 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
405 } else {
406 assert(false, "cannot parse this MH");
407 return methodHandle(); // random MH?
408 }
409 }
411 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) {
412 assert(m->is_method(), "");
413 if (m->is_static()) {
414 // check that signature begins '(L' or '([' (not '(I', '()', etc.)
415 Symbol* sig = m->signature();
416 BasicType recv_bt = char2type(sig->byte_at(1));
417 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')'
418 assert(sig->byte_at(0) == '(', "must be method sig");
419 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY)
420 // decode_flags_result |= _dmf_has_receiver;
421 } else {
422 // non-static method
423 decode_flags_result |= _dmf_has_receiver;
424 if (!m->can_be_statically_bound() && !m->is_initializer()) {
425 decode_flags_result |= _dmf_does_dispatch;
426 if (Klass::cast(m->method_holder())->is_interface())
427 decode_flags_result |= _dmf_from_interface;
428 }
429 }
430 return m;
431 }
434 // A trusted party is handing us a cookie to determine a method.
435 // Let's boil it down to the method oop they really want.
436 methodHandle MethodHandles::decode_method(oop x, KlassHandle& receiver_limit_result, int& decode_flags_result) {
437 decode_flags_result = 0;
438 receiver_limit_result = KlassHandle();
439 klassOop xk = x->klass();
440 if (xk == Universe::methodKlassObj()) {
441 return decode_methodOop((methodOop) x, decode_flags_result);
442 } else if (xk == SystemDictionary::MemberName_klass()) {
443 // Note: This only works if the MemberName has already been resolved.
444 return decode_MemberName(x, receiver_limit_result, decode_flags_result);
445 } else if (java_lang_invoke_MethodHandle::is_subclass(xk)) {
446 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result);
447 } else if (xk == SystemDictionary::reflect_Method_klass()) {
448 oop clazz = java_lang_reflect_Method::clazz(x);
449 int slot = java_lang_reflect_Method::slot(x);
450 klassOop k = java_lang_Class::as_klassOop(clazz);
451 if (k != NULL && Klass::cast(k)->oop_is_instance())
452 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
453 decode_flags_result);
454 } else if (xk == SystemDictionary::reflect_Constructor_klass()) {
455 oop clazz = java_lang_reflect_Constructor::clazz(x);
456 int slot = java_lang_reflect_Constructor::slot(x);
457 klassOop k = java_lang_Class::as_klassOop(clazz);
458 if (k != NULL && Klass::cast(k)->oop_is_instance())
459 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
460 decode_flags_result);
461 } else {
462 // unrecognized object
463 assert(!x->is_method(), "already checked");
464 assert(!java_lang_invoke_MemberName::is_instance(x), "already checked");
465 }
466 return methodHandle();
467 }
470 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) {
471 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass())
472 return 0; // no push/pop
473 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh);
474 int last_vmslots = 0;
475 oop last_mh = mh;
476 for (;;) {
477 oop target = java_lang_invoke_MethodHandle::vmtarget(last_mh);
478 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
479 last_vmslots = java_lang_invoke_MethodHandle::vmslots(target);
480 break;
481 } else if (!java_lang_invoke_MethodHandle::is_instance(target)) {
482 // might be klass or method
483 assert(target->is_method(), "must get here with a direct ref to method");
484 last_vmslots = methodOop(target)->size_of_parameters();
485 break;
486 }
487 last_mh = target;
488 }
489 // If I am called with fewer VM slots than my ultimate callee,
490 // it must be that I push the additionally needed slots.
491 // Likewise if am called with more VM slots, I will pop them.
492 return (last_vmslots - this_vmslots);
493 }
496 // MemberName support
498 // import java_lang_invoke_MemberName.*
499 enum {
500 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
501 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
502 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
503 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
504 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
505 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
506 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE,
507 VM_INDEX_UNINITIALIZED = java_lang_invoke_MemberName::VM_INDEX_UNINITIALIZED
508 };
510 Handle MethodHandles::new_MemberName(TRAPS) {
511 Handle empty;
512 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
513 if (!k->is_initialized()) k->initialize(CHECK_(empty));
514 return Handle(THREAD, k->allocate_instance(THREAD));
515 }
517 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) {
518 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) {
519 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
520 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
521 int mods = java_lang_reflect_Field::modifiers(target_oop);
522 klassOop k = java_lang_Class::as_klassOop(clazz);
523 int offset = instanceKlass::cast(k)->field_offset(slot);
524 init_MemberName(mname_oop, k, accessFlags_from(mods), offset);
525 } else {
526 KlassHandle receiver_limit; int decode_flags = 0;
527 methodHandle m = MethodHandles::decode_method(target_oop, receiver_limit, decode_flags);
528 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
529 init_MemberName(mname_oop, m(), do_dispatch);
530 }
531 }
533 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) {
534 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD)
535 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ));
536 oop vmtarget = m;
537 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet
538 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound())
539 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch
540 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value");
541 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
542 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
543 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
544 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror());
545 }
547 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) {
548 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ));
549 oop vmtarget = field_holder;
550 int vmindex = offset; // determines the field uniquely when combined with static bit
551 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex");
552 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
553 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
554 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
555 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror());
556 }
559 methodHandle MethodHandles::decode_MemberName(oop mname, KlassHandle& receiver_limit_result, int& decode_flags_result) {
560 methodHandle empty;
561 int flags = java_lang_invoke_MemberName::flags(mname);
562 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return empty; // not invocable
563 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname);
564 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
565 if (vmindex == VM_INDEX_UNINITIALIZED) return empty; // not resolved
566 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result);
567 oop clazz = java_lang_invoke_MemberName::clazz(mname);
568 if (clazz != NULL && java_lang_Class::is_instance(clazz)) {
569 klassOop klass = java_lang_Class::as_klassOop(clazz);
570 if (klass != NULL) receiver_limit_result = klass;
571 }
572 return m;
573 }
575 // convert the external string or reflective type to an internal signature
576 Symbol* MethodHandles::convert_to_signature(oop type_str, bool polymorphic, TRAPS) {
577 if (java_lang_invoke_MethodType::is_instance(type_str)) {
578 return java_lang_invoke_MethodType::as_signature(type_str, polymorphic, CHECK_NULL);
579 } else if (java_lang_Class::is_instance(type_str)) {
580 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
581 } else if (java_lang_String::is_instance(type_str)) {
582 if (polymorphic) {
583 return java_lang_String::as_symbol(type_str, CHECK_NULL);
584 } else {
585 return java_lang_String::as_symbol_or_null(type_str);
586 }
587 } else {
588 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
589 }
590 }
592 // An unresolved member name is a mere symbolic reference.
593 // Resolving it plants a vmtarget/vmindex in it,
594 // which refers dirctly to JVM internals.
595 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
596 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
597 #ifdef ASSERT
598 // If this assert throws, renegotiate the sentinel value used by the Java code,
599 // so that it is distinct from any valid vtable index value, and any special
600 // values defined in methodOopDesc::VtableIndexFlag.
601 // The point of the slop is to give the Java code and the JVM some room
602 // to independently specify sentinel values.
603 const int sentinel_slop = 10;
604 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop;
605 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels");
606 #endif
607 if (java_lang_invoke_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED)
608 return; // already resolved
609 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
610 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
611 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
612 int flags = java_lang_invoke_MemberName::flags(mname());
614 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
615 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve");
616 }
618 instanceKlassHandle defc;
619 {
620 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop());
621 if (defc_klassOop == NULL) return; // a primitive; no resolution possible
622 if (!Klass::cast(defc_klassOop)->oop_is_instance()) {
623 if (!Klass::cast(defc_klassOop)->oop_is_array()) return;
624 defc_klassOop = SystemDictionary::Object_klass();
625 }
626 defc = instanceKlassHandle(THREAD, defc_klassOop);
627 }
628 if (defc.is_null()) {
629 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class");
630 }
631 defc->link_class(CHECK); // possible safepoint
633 // convert the external string name to an internal symbol
634 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
635 if (name == NULL) return; // no such name
636 if (name == vmSymbols::class_initializer_name())
637 return; // illegal name
639 Handle polymorphic_method_type;
640 bool polymorphic_signature = false;
641 if ((flags & ALL_KINDS) == IS_METHOD &&
642 (defc() == SystemDictionary::MethodHandle_klass() &&
643 methodOopDesc::is_method_handle_invoke_name(name))) {
644 polymorphic_signature = true;
645 }
647 // convert the external string or reflective type to an internal signature
648 TempNewSymbol type = convert_to_signature(type_str(), polymorphic_signature, CHECK);
649 if (java_lang_invoke_MethodType::is_instance(type_str()) && polymorphic_signature) {
650 polymorphic_method_type = type_str; // preserve exactly
651 }
652 if (type == NULL) return; // no such signature exists in the VM
654 // Time to do the lookup.
655 switch (flags & ALL_KINDS) {
656 case IS_METHOD:
657 {
658 CallInfo result;
659 {
660 EXCEPTION_MARK;
661 if ((flags & JVM_ACC_STATIC) != 0) {
662 LinkResolver::resolve_static_call(result,
663 defc, name, type, KlassHandle(), false, false, THREAD);
664 } else if (defc->is_interface()) {
665 LinkResolver::resolve_interface_call(result, Handle(), defc,
666 defc, name, type, KlassHandle(), false, false, THREAD);
667 } else {
668 LinkResolver::resolve_virtual_call(result, Handle(), defc,
669 defc, name, type, KlassHandle(), false, false, THREAD);
670 }
671 if (HAS_PENDING_EXCEPTION) {
672 CLEAR_PENDING_EXCEPTION;
673 break; // go to second chance
674 }
675 }
676 methodHandle m = result.resolved_method();
677 oop vmtarget = NULL;
678 int vmindex = methodOopDesc::nonvirtual_vtable_index;
679 if (defc->is_interface()) {
680 vmindex = klassItable::compute_itable_index(m());
681 assert(vmindex >= 0, "");
682 } else if (result.has_vtable_index()) {
683 vmindex = result.vtable_index();
684 assert(vmindex >= 0, "");
685 }
686 assert(vmindex != VM_INDEX_UNINITIALIZED, "");
687 if (vmindex < 0) {
688 assert(result.is_statically_bound(), "");
689 vmtarget = m();
690 } else {
691 vmtarget = result.resolved_klass()->as_klassOop();
692 }
693 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
694 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
695 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
696 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
697 DEBUG_ONLY(KlassHandle junk1; int junk2);
698 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(),
699 "properly stored for later decoding");
700 return;
701 }
702 case IS_CONSTRUCTOR:
703 {
704 CallInfo result;
705 {
706 EXCEPTION_MARK;
707 if (name == vmSymbols::object_initializer_name()) {
708 LinkResolver::resolve_special_call(result,
709 defc, name, type, KlassHandle(), false, THREAD);
710 } else {
711 break; // will throw after end of switch
712 }
713 if (HAS_PENDING_EXCEPTION) {
714 CLEAR_PENDING_EXCEPTION;
715 return;
716 }
717 }
718 assert(result.is_statically_bound(), "");
719 methodHandle m = result.resolved_method();
720 oop vmtarget = m();
721 int vmindex = methodOopDesc::nonvirtual_vtable_index;
722 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
723 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
724 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
725 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
726 DEBUG_ONLY(KlassHandle junk1; int junk2);
727 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(),
728 "properly stored for later decoding");
729 return;
730 }
731 case IS_FIELD:
732 {
733 // This is taken from LinkResolver::resolve_field, sans access checks.
734 fieldDescriptor fd; // find_field initializes fd if found
735 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd));
736 // check if field exists; i.e., if a klass containing the field def has been selected
737 if (sel_klass.is_null()) return;
738 oop vmtarget = sel_klass->as_klassOop();
739 int vmindex = fd.offset();
740 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS);
741 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen
742 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
743 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
744 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
745 return;
746 }
747 default:
748 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
749 }
751 // Second chance.
752 if (polymorphic_method_type.not_null()) {
753 // Look on a non-null class loader.
754 Handle cur_class_loader;
755 const int nptypes = java_lang_invoke_MethodType::ptype_count(polymorphic_method_type());
756 for (int i = 0; i <= nptypes; i++) {
757 oop type_mirror;
758 if (i < nptypes) type_mirror = java_lang_invoke_MethodType::ptype(polymorphic_method_type(), i);
759 else type_mirror = java_lang_invoke_MethodType::rtype(polymorphic_method_type());
760 klassOop example_type = java_lang_Class::as_klassOop(type_mirror);
761 if (example_type == NULL) continue;
762 oop class_loader = Klass::cast(example_type)->class_loader();
763 if (class_loader == NULL || class_loader == cur_class_loader()) continue;
764 cur_class_loader = Handle(THREAD, class_loader);
765 methodOop m = SystemDictionary::find_method_handle_invoke(name,
766 type,
767 KlassHandle(THREAD, example_type),
768 THREAD);
769 if (HAS_PENDING_EXCEPTION) {
770 CLEAR_PENDING_EXCEPTION;
771 m = NULL;
772 // try again with a different class loader...
773 }
774 if (m != NULL &&
775 m->is_method_handle_invoke() &&
776 java_lang_invoke_MethodType::equals(polymorphic_method_type(), m->method_handle_type())) {
777 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
778 java_lang_invoke_MemberName::set_vmtarget(mname(), m);
779 java_lang_invoke_MemberName::set_vmindex(mname(), m->vtable_index());
780 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
781 return;
782 }
783 }
784 }
785 }
787 // Conversely, a member name which is only initialized from JVM internals
788 // may have null defc, name, and type fields.
789 // Resolving it plants a vmtarget/vmindex in it,
790 // which refers directly to JVM internals.
791 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
792 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
793 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
794 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
795 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) {
796 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
797 }
799 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
800 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
801 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
802 int flags = java_lang_invoke_MemberName::flags(mname());
804 if (suppress != 0) {
805 if (suppress & _suppress_defc) have_defc = true;
806 if (suppress & _suppress_name) have_name = true;
807 if (suppress & _suppress_type) have_type = true;
808 }
810 if (have_defc && have_name && have_type) return; // nothing needed
812 switch (flags & ALL_KINDS) {
813 case IS_METHOD:
814 case IS_CONSTRUCTOR:
815 {
816 KlassHandle receiver_limit; int decode_flags = 0;
817 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit, decode_flags);
818 if (m.is_null()) break;
819 if (!have_defc) {
820 klassOop defc = m->method_holder();
821 if (receiver_limit.not_null() && receiver_limit() != defc
822 && Klass::cast(receiver_limit())->is_subtype_of(defc))
823 defc = receiver_limit();
824 java_lang_invoke_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror());
825 }
826 if (!have_name) {
827 //not java_lang_String::create_from_symbol; let's intern member names
828 Handle name = StringTable::intern(m->name(), CHECK);
829 java_lang_invoke_MemberName::set_name(mname(), name());
830 }
831 if (!have_type) {
832 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
833 java_lang_invoke_MemberName::set_type(mname(), type());
834 }
835 return;
836 }
837 case IS_FIELD:
838 {
839 // This is taken from LinkResolver::resolve_field, sans access checks.
840 if (!vmtarget->is_klass()) break;
841 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break;
842 instanceKlassHandle defc(THREAD, (klassOop) vmtarget);
843 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
844 fieldDescriptor fd; // find_field initializes fd if found
845 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
846 break; // cannot expand
847 if (!have_defc) {
848 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
849 }
850 if (!have_name) {
851 //not java_lang_String::create_from_symbol; let's intern member names
852 Handle name = StringTable::intern(fd.name(), CHECK);
853 java_lang_invoke_MemberName::set_name(mname(), name());
854 }
855 if (!have_type) {
856 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
857 java_lang_invoke_MemberName::set_type(mname(), type());
858 }
859 return;
860 }
861 }
862 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
863 }
865 int MethodHandles::find_MemberNames(klassOop k,
866 Symbol* name, Symbol* sig,
867 int mflags, klassOop caller,
868 int skip, objArrayOop results) {
869 DEBUG_ONLY(No_Safepoint_Verifier nsv);
870 // this code contains no safepoints!
872 // %%% take caller into account!
874 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1;
876 int rfill = 0, rlimit = results->length(), rskip = skip;
877 // overflow measurement:
878 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
880 int match_flags = mflags;
881 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
882 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
883 bool local_only = !(search_superc | search_intfc);
884 bool classes_only = false;
886 if (name != NULL) {
887 if (name->utf8_length() == 0) return 0; // a match is not possible
888 }
889 if (sig != NULL) {
890 if (sig->utf8_length() == 0) return 0; // a match is not possible
891 if (sig->byte_at(0) == '(')
892 match_flags &= ~(IS_FIELD | IS_TYPE);
893 else
894 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
895 }
897 if ((match_flags & IS_TYPE) != 0) {
898 // NYI, and Core Reflection works quite well for this query
899 }
901 if ((match_flags & IS_FIELD) != 0) {
902 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
903 if (name != NULL && st.name() != name)
904 continue;
905 if (sig != NULL && st.signature() != sig)
906 continue;
907 // passed the filters
908 if (rskip > 0) {
909 --rskip;
910 } else if (rfill < rlimit) {
911 oop result = results->obj_at(rfill++);
912 if (!java_lang_invoke_MemberName::is_instance(result))
913 return -99; // caller bug!
914 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset());
915 } else if (++overflow >= overflow_limit) {
916 match_flags = 0; break; // got tired of looking at overflow
917 }
918 }
919 }
921 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
922 // watch out for these guys:
923 Symbol* init_name = vmSymbols::object_initializer_name();
924 Symbol* clinit_name = vmSymbols::class_initializer_name();
925 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
926 bool negate_name_test = false;
927 // fix name so that it captures the intention of IS_CONSTRUCTOR
928 if (!(match_flags & IS_METHOD)) {
929 // constructors only
930 if (name == NULL) {
931 name = init_name;
932 } else if (name != init_name) {
933 return 0; // no constructors of this method name
934 }
935 } else if (!(match_flags & IS_CONSTRUCTOR)) {
936 // methods only
937 if (name == NULL) {
938 name = init_name;
939 negate_name_test = true; // if we see the name, we *omit* the entry
940 } else if (name == init_name) {
941 return 0; // no methods of this constructor name
942 }
943 } else {
944 // caller will accept either sort; no need to adjust name
945 }
946 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
947 methodOop m = st.method();
948 Symbol* m_name = m->name();
949 if (m_name == clinit_name)
950 continue;
951 if (name != NULL && ((m_name != name) ^ negate_name_test))
952 continue;
953 if (sig != NULL && m->signature() != sig)
954 continue;
955 // passed the filters
956 if (rskip > 0) {
957 --rskip;
958 } else if (rfill < rlimit) {
959 oop result = results->obj_at(rfill++);
960 if (!java_lang_invoke_MemberName::is_instance(result))
961 return -99; // caller bug!
962 MethodHandles::init_MemberName(result, m, true);
963 } else if (++overflow >= overflow_limit) {
964 match_flags = 0; break; // got tired of looking at overflow
965 }
966 }
967 }
969 // return number of elements we at leasted wanted to initialize
970 return rfill + overflow;
971 }
974 // Decode this java.lang.Class object into an instanceKlass, if possible.
975 // Throw IAE if not
976 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) {
977 instanceKlassHandle empty;
978 klassOop caller = NULL;
979 if (java_lang_Class::is_instance(java_mirror_oop)) {
980 caller = java_lang_Class::as_klassOop(java_mirror_oop);
981 }
982 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) {
983 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty);
984 }
985 return instanceKlassHandle(THREAD, caller);
986 }
990 // Decode the vmtarget field of a method handle.
991 // Sanitize out methodOops, klassOops, and any other non-Java data.
992 // This is for debugging and reflection.
993 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) {
994 assert(java_lang_invoke_MethodHandle::is_instance(mh()), "must be a MH");
995 if (format == ETF_FORCE_DIRECT_HANDLE ||
996 format == ETF_COMPILE_DIRECT_HANDLE) {
997 // Internal function for stress testing.
998 Handle mt = java_lang_invoke_MethodHandle::type(mh());
999 int invocation_count = 10000;
1000 TempNewSymbol signature = java_lang_invoke_MethodType::as_signature(mt(), true, CHECK_NULL);
1001 bool omit_receiver_argument = true;
1002 MethodHandleCompiler mhc(mh, vmSymbols::invoke_name(), signature, invocation_count, omit_receiver_argument, CHECK_NULL);
1003 methodHandle m = mhc.compile(CHECK_NULL);
1004 if (StressMethodHandleWalk && Verbose || PrintMiscellaneous) {
1005 tty->print_cr("MethodHandleNatives.getTarget(%s)",
1006 format == ETF_FORCE_DIRECT_HANDLE ? "FORCE_DIRECT" : "COMPILE_DIRECT");
1007 if (Verbose) {
1008 m->print_codes();
1009 }
1010 }
1011 if (StressMethodHandleWalk) {
1012 InterpreterOopMap mask;
1013 OopMapCache::compute_one_oop_map(m, m->code_size() - 1, &mask);
1014 }
1015 if ((format == ETF_COMPILE_DIRECT_HANDLE ||
1016 CompilationPolicy::must_be_compiled(m))
1017 && !instanceKlass::cast(m->method_holder())->is_not_initialized()
1018 && CompilationPolicy::can_be_compiled(m)) {
1019 // Force compilation
1020 CompileBroker::compile_method(m, InvocationEntryBci,
1021 CompilationPolicy::policy()->initial_compile_level(),
1022 methodHandle(), 0, "MethodHandleNatives.getTarget",
1023 CHECK_NULL);
1024 }
1025 // Now wrap m in a DirectMethodHandle.
1026 instanceKlassHandle dmh_klass(THREAD, SystemDictionary::DirectMethodHandle_klass());
1027 Handle dmh = dmh_klass->allocate_instance_handle(CHECK_NULL);
1028 JavaValue ignore_result(T_VOID);
1029 Symbol* init_name = vmSymbols::object_initializer_name();
1030 Symbol* init_sig = vmSymbols::notifyGenericMethodType_signature();
1031 JavaCalls::call_special(&ignore_result, dmh,
1032 SystemDictionaryHandles::MethodHandle_klass(), init_name, init_sig,
1033 java_lang_invoke_MethodHandle::type(mh()), CHECK_NULL);
1034 MethodHandles::init_DirectMethodHandle(dmh, m, false, CHECK_NULL);
1035 return dmh();
1036 }
1037 if (format == ETF_HANDLE_OR_METHOD_NAME) {
1038 oop target = java_lang_invoke_MethodHandle::vmtarget(mh());
1039 if (target == NULL) {
1040 return NULL; // unformed MH
1041 }
1042 klassOop tklass = target->klass();
1043 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) {
1044 return target; // target is another MH (or something else?)
1045 }
1046 }
1047 if (format == ETF_DIRECT_HANDLE) {
1048 oop target = mh();
1049 for (;;) {
1050 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
1051 return target;
1052 }
1053 if (!java_lang_invoke_MethodHandle::is_instance(target)){
1054 return NULL; // unformed MH
1055 }
1056 target = java_lang_invoke_MethodHandle::vmtarget(target);
1057 }
1058 }
1059 // cases of metadata in MH.vmtarget:
1060 // - AMH can have methodOop for static invoke with bound receiver
1061 // - DMH can have methodOop for static invoke (on variable receiver)
1062 // - DMH can have klassOop for dispatched (non-static) invoke
1063 KlassHandle receiver_limit; int decode_flags = 0;
1064 methodHandle m = decode_MethodHandle(mh(), receiver_limit, decode_flags);
1065 if (m.is_null()) return NULL;
1066 switch (format) {
1067 case ETF_REFLECT_METHOD:
1068 // same as jni_ToReflectedMethod:
1069 if (m->is_initializer()) {
1070 return Reflection::new_constructor(m, THREAD);
1071 } else {
1072 return Reflection::new_method(m, UseNewReflection, false, THREAD);
1073 }
1075 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle
1076 case ETF_METHOD_NAME:
1077 {
1078 if (SystemDictionary::MemberName_klass() == NULL) break;
1079 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass());
1080 mname_klass->initialize(CHECK_NULL);
1081 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); // possible safepoint
1082 java_lang_invoke_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED);
1083 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
1084 init_MemberName(mname(), m(), do_dispatch);
1085 expand_MemberName(mname, 0, CHECK_NULL);
1086 return mname();
1087 }
1088 }
1090 // Unknown format code.
1091 char msg[50];
1092 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format);
1093 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg);
1094 }
1096 static const char* always_null_names[] = {
1097 "java/lang/Void",
1098 "java/lang/Null",
1099 //"java/lang/Nothing",
1100 "sun/dyn/empty/Empty",
1101 "sun/invoke/empty/Empty",
1102 NULL
1103 };
1105 static bool is_always_null_type(klassOop klass) {
1106 if (klass == NULL) return false; // safety
1107 if (!Klass::cast(klass)->oop_is_instance()) return false;
1108 instanceKlass* ik = instanceKlass::cast(klass);
1109 // Must be on the boot class path:
1110 if (ik->class_loader() != NULL) return false;
1111 // Check the name.
1112 Symbol* name = ik->name();
1113 for (int i = 0; ; i++) {
1114 const char* test_name = always_null_names[i];
1115 if (test_name == NULL) break;
1116 if (name->equals(test_name))
1117 return true;
1118 }
1119 return false;
1120 }
1122 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) {
1123 if (dst == NULL) return true;
1124 if (src == NULL) return (dst != SystemDictionary::Object_klass());
1125 if (src == dst || dst == SystemDictionary::Object_klass())
1126 return false; // quickest checks
1127 Klass* srck = Klass::cast(src);
1128 Klass* dstk = Klass::cast(dst);
1129 if (dstk->is_interface()) {
1130 // interface receivers can safely be viewed as untyped,
1131 // because interface calls always include a dynamic check
1132 //dstk = Klass::cast(SystemDictionary::Object_klass());
1133 return false;
1134 }
1135 if (srck->is_interface()) {
1136 // interface arguments must be viewed as untyped
1137 //srck = Klass::cast(SystemDictionary::Object_klass());
1138 return true;
1139 }
1140 if (is_always_null_type(src)) {
1141 // some source types are known to be never instantiated;
1142 // they represent references which are always null
1143 // such null references never fail to convert safely
1144 return false;
1145 }
1146 return !srck->is_subclass_of(dstk->as_klassOop());
1147 }
1149 static oop object_java_mirror() {
1150 return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
1151 }
1153 bool MethodHandles::is_float_fixed_reinterpretation_cast(BasicType src, BasicType dst) {
1154 if (src == T_FLOAT) return dst == T_INT;
1155 if (src == T_INT) return dst == T_FLOAT;
1156 if (src == T_DOUBLE) return dst == T_LONG;
1157 if (src == T_LONG) return dst == T_DOUBLE;
1158 return false;
1159 }
1161 bool MethodHandles::same_basic_type_for_arguments(BasicType src,
1162 BasicType dst,
1163 bool raw,
1164 bool for_return) {
1165 if (for_return) {
1166 // return values can always be forgotten:
1167 if (dst == T_VOID) return true;
1168 if (src == T_VOID) return raw && (dst == T_INT);
1169 // We allow caller to receive a garbage int, which is harmless.
1170 // This trick is pulled by trusted code (see VerifyType.canPassRaw).
1171 }
1172 assert(src != T_VOID && dst != T_VOID, "should not be here");
1173 if (src == dst) return true;
1174 if (type2size[src] != type2size[dst]) return false;
1175 if (src == T_OBJECT || dst == T_OBJECT) return false;
1176 if (raw) return true; // bitwise reinterpretation; caller guarantees safety
1177 // allow reinterpretation casts for integral widening
1178 if (is_subword_type(src)) { // subwords can fit in int or other subwords
1179 if (dst == T_INT) // any subword fits in an int
1180 return true;
1181 if (src == T_BOOLEAN) // boolean fits in any subword
1182 return is_subword_type(dst);
1183 if (src == T_BYTE && dst == T_SHORT)
1184 return true; // remaining case: byte fits in short
1185 }
1186 // allow float/fixed reinterpretation casts
1187 if (is_float_fixed_reinterpretation_cast(src, dst))
1188 return true;
1189 return false;
1190 }
1192 const char* MethodHandles::check_method_receiver(methodOop m,
1193 klassOop passed_recv_type) {
1194 assert(!m->is_static(), "caller resp.");
1195 if (passed_recv_type == NULL)
1196 return "receiver type is primitive";
1197 if (class_cast_needed(passed_recv_type, m->method_holder())) {
1198 Klass* formal = Klass::cast(m->method_holder());
1199 return SharedRuntime::generate_class_cast_message("receiver type",
1200 formal->external_name());
1201 }
1202 return NULL; // checks passed
1203 }
1205 // Verify that m's signature can be called type-safely by a method handle
1206 // of the given method type 'mtype'.
1207 // It takes a TRAPS argument because it must perform symbol lookups.
1208 void MethodHandles::verify_method_signature(methodHandle m,
1209 Handle mtype,
1210 int first_ptype_pos,
1211 KlassHandle insert_ptype,
1212 TRAPS) {
1213 Handle mhi_type;
1214 if (m->is_method_handle_invoke()) {
1215 // use this more exact typing instead of the symbolic signature:
1216 mhi_type = Handle(THREAD, m->method_handle_type());
1217 }
1218 objArrayHandle ptypes(THREAD, java_lang_invoke_MethodType::ptypes(mtype()));
1219 int pnum = first_ptype_pos;
1220 int pmax = ptypes->length();
1221 int anum = 0; // method argument
1222 const char* err = NULL;
1223 ResourceMark rm(THREAD);
1224 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
1225 oop ptype_oop = NULL;
1226 if (ss.at_return_type()) {
1227 if (pnum != pmax)
1228 { err = "too many arguments"; break; }
1229 ptype_oop = java_lang_invoke_MethodType::rtype(mtype());
1230 } else {
1231 if (pnum >= pmax)
1232 { err = "not enough arguments"; break; }
1233 if (pnum >= 0)
1234 ptype_oop = ptypes->obj_at(pnum);
1235 else if (insert_ptype.is_null())
1236 ptype_oop = NULL;
1237 else
1238 ptype_oop = insert_ptype->java_mirror();
1239 pnum += 1;
1240 anum += 1;
1241 }
1242 KlassHandle pklass;
1243 BasicType ptype = T_OBJECT;
1244 bool have_ptype = false;
1245 // missing ptype_oop does not match any non-reference; use Object to report the error
1246 pklass = SystemDictionaryHandles::Object_klass();
1247 if (ptype_oop != NULL) {
1248 have_ptype = true;
1249 klassOop pklass_oop = NULL;
1250 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass_oop);
1251 pklass = KlassHandle(THREAD, pklass_oop);
1252 }
1253 ptype_oop = NULL; //done with this
1254 KlassHandle aklass;
1255 BasicType atype = ss.type();
1256 if (atype == T_ARRAY) atype = T_OBJECT; // fold all refs to T_OBJECT
1257 if (atype == T_OBJECT) {
1258 if (!have_ptype) {
1259 // null matches any reference
1260 continue;
1261 }
1262 if (mhi_type.is_null()) {
1263 // If we fail to resolve types at this point, we will usually throw an error.
1264 TempNewSymbol name = ss.as_symbol_or_null();
1265 if (name != NULL) {
1266 instanceKlass* mk = instanceKlass::cast(m->method_holder());
1267 Handle loader(THREAD, mk->class_loader());
1268 Handle domain(THREAD, mk->protection_domain());
1269 klassOop aklass_oop = SystemDictionary::resolve_or_null(name, loader, domain, CHECK);
1270 if (aklass_oop != NULL)
1271 aklass = KlassHandle(THREAD, aklass_oop);
1272 if (aklass.is_null() &&
1273 pklass.not_null() &&
1274 loader.is_null() &&
1275 pklass->name() == name)
1276 // accept name equivalence here, since that's the best we can do
1277 aklass = pklass;
1278 }
1279 } else {
1280 // for method handle invokers we don't look at the name in the signature
1281 oop atype_oop;
1282 if (ss.at_return_type())
1283 atype_oop = java_lang_invoke_MethodType::rtype(mhi_type());
1284 else
1285 atype_oop = java_lang_invoke_MethodType::ptype(mhi_type(), anum-1);
1286 klassOop aklass_oop = NULL;
1287 atype = java_lang_Class::as_BasicType(atype_oop, &aklass_oop);
1288 aklass = KlassHandle(THREAD, aklass_oop);
1289 }
1290 }
1291 if (!ss.at_return_type()) {
1292 err = check_argument_type_change(ptype, pklass(), atype, aklass(), anum);
1293 } else {
1294 err = check_return_type_change(atype, aklass(), ptype, pklass()); // note reversal!
1295 }
1296 if (err != NULL) break;
1297 }
1299 if (err != NULL) {
1300 #ifndef PRODUCT
1301 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1302 tty->print("*** verify_method_signature failed: ");
1303 java_lang_invoke_MethodType::print_signature(mtype(), tty);
1304 tty->cr();
1305 tty->print_cr(" first_ptype_pos = %d, insert_ptype = "UINTX_FORMAT, first_ptype_pos, insert_ptype());
1306 tty->print(" Failing method: ");
1307 m->print();
1308 }
1309 #endif //PRODUCT
1310 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1311 }
1312 }
1314 // Main routine for verifying the MethodHandle.type of a proposed
1315 // direct or bound-direct method handle.
1316 void MethodHandles::verify_method_type(methodHandle m,
1317 Handle mtype,
1318 bool has_bound_recv,
1319 KlassHandle bound_recv_type,
1320 TRAPS) {
1321 bool m_needs_receiver = !m->is_static();
1323 const char* err = NULL;
1325 int first_ptype_pos = m_needs_receiver ? 1 : 0;
1326 if (has_bound_recv) {
1327 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them
1328 if (m_needs_receiver && bound_recv_type.is_null())
1329 { err = "bound receiver is not an object"; goto die; }
1330 }
1332 if (m_needs_receiver && err == NULL) {
1333 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype());
1334 if (ptypes->length() < first_ptype_pos)
1335 { err = "receiver argument is missing"; goto die; }
1336 if (has_bound_recv)
1337 err = check_method_receiver(m(), bound_recv_type->as_klassOop());
1338 else
1339 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1)));
1340 if (err != NULL) goto die;
1341 }
1343 // Check the other arguments for mistypes.
1344 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK);
1345 return;
1347 die:
1348 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1349 }
1351 void MethodHandles::verify_vmslots(Handle mh, TRAPS) {
1352 // Verify vmslots.
1353 int check_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(mh()));
1354 if (java_lang_invoke_MethodHandle::vmslots(mh()) != check_slots) {
1355 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH");
1356 }
1357 }
1359 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) {
1360 // Verify that argslot points at the given argnum.
1361 int check_slot = argument_slot(java_lang_invoke_MethodHandle::type(mh()), argnum);
1362 if (argslot != check_slot || argslot < 0) {
1363 ResourceMark rm;
1364 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d";
1365 size_t msglen = strlen(fmt) + 3*11 + 1;
1366 char* msg = NEW_RESOURCE_ARRAY(char, msglen);
1367 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot);
1368 THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
1369 }
1370 }
1372 // Verify the correspondence between two method types.
1373 // Apart from the advertised changes, caller method type X must
1374 // be able to invoke the callee method Y type with no violations
1375 // of type integrity.
1376 // Return NULL if all is well, else a short error message.
1377 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end,
1378 int insert_argnum, oop insert_type,
1379 int change_argnum, oop change_type,
1380 int delete_argnum,
1381 oop dst_mtype, int dst_beg, int dst_end,
1382 bool raw) {
1383 objArrayOop src_ptypes = java_lang_invoke_MethodType::ptypes(src_mtype);
1384 objArrayOop dst_ptypes = java_lang_invoke_MethodType::ptypes(dst_mtype);
1386 int src_max = src_ptypes->length();
1387 int dst_max = dst_ptypes->length();
1389 if (src_end == -1) src_end = src_max;
1390 if (dst_end == -1) dst_end = dst_max;
1392 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob");
1393 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob");
1395 // pending actions; set to -1 when done:
1396 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum;
1398 const char* err = NULL;
1400 // Walk along each array of parameter types, including a virtual
1401 // NULL end marker at the end of each.
1402 for (int src_idx = src_beg, dst_idx = dst_beg;
1403 (src_idx <= src_end && dst_idx <= dst_end);
1404 src_idx++, dst_idx++) {
1405 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx);
1406 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx);
1407 bool fix_null_src_type = false;
1409 // Perform requested edits.
1410 if (ins_idx == src_idx) {
1411 // note that the inserted guy is never affected by a change or deletion
1412 ins_idx = -1;
1413 src_type = insert_type;
1414 fix_null_src_type = true;
1415 --src_idx; // back up to process src type on next loop
1416 src_idx = src_end;
1417 } else {
1418 // note that the changed guy can be immediately deleted
1419 if (chg_idx == src_idx) {
1420 chg_idx = -1;
1421 assert(src_idx < src_end, "oob");
1422 src_type = change_type;
1423 fix_null_src_type = true;
1424 }
1425 if (del_idx == src_idx) {
1426 del_idx = -1;
1427 assert(src_idx < src_end, "oob");
1428 --dst_idx;
1429 continue; // rerun loop after skipping this position
1430 }
1431 }
1433 if (src_type == NULL && fix_null_src_type)
1434 // explicit null in this case matches any dest reference
1435 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type);
1437 // Compare the two argument types.
1438 if (src_type != dst_type) {
1439 if (src_type == NULL) return "not enough arguments";
1440 if (dst_type == NULL) return "too many arguments";
1441 err = check_argument_type_change(src_type, dst_type, dst_idx, raw);
1442 if (err != NULL) return err;
1443 }
1444 }
1446 // Now compare return types also.
1447 oop src_rtype = java_lang_invoke_MethodType::rtype(src_mtype);
1448 oop dst_rtype = java_lang_invoke_MethodType::rtype(dst_mtype);
1449 if (src_rtype != dst_rtype) {
1450 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal!
1451 if (err != NULL) return err;
1452 }
1454 assert(err == NULL, "");
1455 return NULL; // all is well
1456 }
1459 const char* MethodHandles::check_argument_type_change(BasicType src_type,
1460 klassOop src_klass,
1461 BasicType dst_type,
1462 klassOop dst_klass,
1463 int argnum,
1464 bool raw) {
1465 const char* err = NULL;
1466 const bool for_return = (argnum < 0);
1468 // just in case:
1469 if (src_type == T_ARRAY) src_type = T_OBJECT;
1470 if (dst_type == T_ARRAY) dst_type = T_OBJECT;
1472 // Produce some nice messages if VerifyMethodHandles is turned on:
1473 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) {
1474 if (src_type == T_OBJECT) {
1475 if (raw && is_java_primitive(dst_type))
1476 return NULL; // ref-to-prim discards ref and returns zero
1477 err = (!for_return
1478 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s"
1479 : "type mismatch: returning a %s, but caller expects primitive %s");
1480 } else if (dst_type == T_OBJECT) {
1481 err = (!for_return
1482 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s"
1483 : "type mismatch: returning a primitive %s, but caller expects %s");
1484 } else {
1485 err = (!for_return
1486 ? "type mismatch: passing a %s for method argument #%d, which expects %s"
1487 : "type mismatch: returning a %s, but caller expects %s");
1488 }
1489 } else if (src_type == T_OBJECT && dst_type == T_OBJECT &&
1490 class_cast_needed(src_klass, dst_klass)) {
1491 if (!class_cast_needed(dst_klass, src_klass)) {
1492 if (raw)
1493 return NULL; // reverse cast is OK; the MH target is trusted to enforce it
1494 err = (!for_return
1495 ? "cast required: passing a %s for method argument #%d, which expects %s"
1496 : "cast required: returning a %s, but caller expects %s");
1497 } else {
1498 err = (!for_return
1499 ? "reference mismatch: passing a %s for method argument #%d, which expects %s"
1500 : "reference mismatch: returning a %s, but caller expects %s");
1501 }
1502 } else {
1503 // passed the obstacle course
1504 return NULL;
1505 }
1507 // format, format, format
1508 const char* src_name = type2name(src_type);
1509 const char* dst_name = type2name(dst_type);
1510 if (src_name == NULL) src_name = "unknown type";
1511 if (dst_name == NULL) dst_name = "unknown type";
1512 if (src_type == T_OBJECT)
1513 src_name = (src_klass != NULL) ? Klass::cast(src_klass)->external_name() : "an unresolved class";
1514 if (dst_type == T_OBJECT)
1515 dst_name = (dst_klass != NULL) ? Klass::cast(dst_klass)->external_name() : "an unresolved class";
1517 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11);
1518 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1);
1519 if (!for_return) {
1520 assert(strstr(err, "%d") != NULL, "");
1521 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name);
1522 } else {
1523 assert(strstr(err, "%d") == NULL, "");
1524 jio_snprintf(msg, msglen, err, src_name, dst_name);
1525 }
1526 return msg;
1527 }
1529 // Compute the depth within the stack of the given argument, i.e.,
1530 // the combined size of arguments to the right of the given argument.
1531 // For the last argument (ptypes.length-1) this will be zero.
1532 // For the first argument (0) this will be the size of all
1533 // arguments but that one. For the special number -1, this
1534 // will be the size of all arguments, including the first.
1535 // If the argument is neither -1 nor a valid argument index,
1536 // then return a negative number. Otherwise, the result
1537 // is in the range [0..vmslots] inclusive.
1538 int MethodHandles::argument_slot(oop method_type, int arg) {
1539 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type);
1540 int argslot = 0;
1541 int len = ptypes->length();
1542 if (arg < -1 || arg >= len) return -99;
1543 for (int i = len-1; i > arg; i--) {
1544 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1545 argslot += type2size[bt];
1546 }
1547 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works");
1548 return argslot;
1549 }
1551 // Given a slot number, return the argument number.
1552 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) {
1553 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type);
1554 int argslot = 0;
1555 int len = ptypes->length();
1556 for (int i = len-1; i >= 0; i--) {
1557 if (query_argslot == argslot) return i;
1558 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1559 argslot += type2size[bt];
1560 }
1561 // return pseudo-arg deepest in stack:
1562 if (query_argslot == argslot) return -1;
1563 return -99; // oob slot, or splitting a double-slot arg
1564 }
1566 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m,
1567 KlassHandle receiver_limit,
1568 int decode_flags,
1569 KlassHandle receiver_klass,
1570 TRAPS) {
1571 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference");
1572 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument");
1574 if (!m->is_static() &&
1575 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder())))
1576 // given type does not match class of method, or receiver is null!
1577 // caller should have checked this, but let's be extra careful...
1578 return methodHandle();
1580 if (receiver_limit.not_null() &&
1581 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit())))
1582 // given type is not limited to the receiver type
1583 // note that a null receiver can match any reference value, for a static method
1584 return methodHandle();
1586 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) {
1587 // pre-dispatched or static method (null receiver is OK for static)
1588 return m;
1590 } else if (receiver_klass.is_null()) {
1591 // null receiver value; cannot dispatch
1592 return methodHandle();
1594 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) {
1595 // perform virtual dispatch
1596 int vtable_index = m->vtable_index();
1597 guarantee(vtable_index >= 0, "valid vtable index");
1599 // receiver_klass might be an arrayKlassOop but all vtables start at
1600 // the same place. The cast is to avoid virtual call and assertion.
1601 // See also LinkResolver::runtime_resolve_virtual_method.
1602 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass());
1603 DEBUG_ONLY(inst->verify_vtable_index(vtable_index));
1604 methodOop m_oop = inst->method_at_vtable(vtable_index);
1605 return methodHandle(THREAD, m_oop);
1607 } else {
1608 // perform interface dispatch
1609 int itable_index = klassItable::compute_itable_index(m());
1610 guarantee(itable_index >= 0, "valid itable index");
1611 instanceKlass* inst = instanceKlass::cast(receiver_klass());
1612 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD);
1613 return methodHandle(THREAD, m_oop);
1614 }
1615 }
1617 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) {
1618 // Verify type.
1619 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1620 verify_method_type(m, mtype, false, KlassHandle(), CHECK);
1622 // Verify vmslots.
1623 if (java_lang_invoke_MethodHandle::vmslots(mh()) != m->size_of_parameters()) {
1624 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH");
1625 }
1626 }
1628 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) {
1629 // Check arguments.
1630 if (mh.is_null() || m.is_null() ||
1631 (!do_dispatch && m->is_abstract())) {
1632 THROW(vmSymbols::java_lang_InternalError());
1633 }
1635 if (VerifyMethodHandles) {
1636 // The privileged code which invokes this routine should not make
1637 // a mistake about types, but it's better to verify.
1638 verify_DirectMethodHandle(mh, m, CHECK);
1639 }
1641 // Finally, after safety checks are done, link to the target method.
1642 // We will follow the same path as the latter part of
1643 // InterpreterRuntime::resolve_invoke(), which first finds the method
1644 // and then decides how to populate the constant pool cache entry
1645 // that links the interpreter calls to the method. We need the same
1646 // bits, and will use the same calling sequence code.
1648 int vmindex = methodOopDesc::garbage_vtable_index;
1649 Handle vmtarget;
1651 instanceKlass::cast(m->method_holder())->link_class(CHECK);
1653 MethodHandleEntry* me = NULL;
1654 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) {
1655 // We are simulating an invokeinterface instruction.
1656 // (We might also be simulating an invokevirtual on a miranda method,
1657 // but it is safe to treat it as an invokeinterface.)
1658 assert(!m->can_be_statically_bound(), "no final methods on interfaces");
1659 vmindex = klassItable::compute_itable_index(m());
1660 assert(vmindex >= 0, "(>=0) == do_dispatch");
1661 // Set up same bits as ConstantPoolCacheEntry::set_interface_call().
1662 vmtarget = m->method_holder(); // the interface
1663 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh);
1664 } else if (!do_dispatch || m->can_be_statically_bound()) {
1665 // We are simulating an invokestatic or invokespecial instruction.
1666 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method().
1667 vmtarget = m;
1668 // this does not help dispatch, but it will make it possible to parse this MH:
1669 vmindex = methodOopDesc::nonvirtual_vtable_index;
1670 assert(vmindex < 0, "(>=0) == do_dispatch");
1671 if (!m->is_static()) {
1672 me = MethodHandles::entry(MethodHandles::_invokespecial_mh);
1673 } else {
1674 me = MethodHandles::entry(MethodHandles::_invokestatic_mh);
1675 // Part of the semantics of a static call is an initialization barrier.
1676 // For a DMH, it is done now, when the handle is created.
1677 Klass* k = Klass::cast(m->method_holder());
1678 if (k->should_be_initialized()) {
1679 k->initialize(CHECK); // possible safepoint
1680 }
1681 }
1682 } else {
1683 // We are simulating an invokevirtual instruction.
1684 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method().
1685 // The key logic is LinkResolver::runtime_resolve_virtual_method.
1686 vmindex = m->vtable_index();
1687 vmtarget = m->method_holder();
1688 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh);
1689 }
1691 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
1693 java_lang_invoke_DirectMethodHandle::set_vmtarget(mh(), vmtarget());
1694 java_lang_invoke_DirectMethodHandle::set_vmindex( mh(), vmindex);
1695 DEBUG_ONLY(KlassHandle rlimit; int flags);
1696 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m,
1697 "properly stored for later decoding");
1698 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0));
1699 assert(!(actual_do_dispatch && !do_dispatch),
1700 "do not perform dispatch if !do_dispatch specified");
1701 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch");
1702 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack");
1704 // Done!
1705 java_lang_invoke_MethodHandle::set_vmentry(mh(), me);
1706 }
1708 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh,
1709 methodHandle m,
1710 TRAPS) {
1711 // Verify type.
1712 KlassHandle bound_recv_type;
1713 {
1714 oop receiver = java_lang_invoke_BoundMethodHandle::argument(mh());
1715 if (receiver != NULL)
1716 bound_recv_type = KlassHandle(THREAD, receiver->klass());
1717 }
1718 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1719 verify_method_type(m, mtype, true, bound_recv_type, CHECK);
1721 int receiver_pos = m->size_of_parameters() - 1;
1723 // Verify MH.vmargslot, which should point at the bound receiver.
1724 verify_vmargslot(mh, -1, java_lang_invoke_BoundMethodHandle::vmargslot(mh()), CHECK);
1725 //verify_vmslots(mh, CHECK);
1727 // Verify vmslots.
1728 if (java_lang_invoke_MethodHandle::vmslots(mh()) != receiver_pos) {
1729 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)");
1730 }
1731 }
1733 // Initialize a BMH with a receiver bound directly to a methodOop.
1734 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh,
1735 methodHandle original_m,
1736 KlassHandle receiver_limit,
1737 int decode_flags,
1738 TRAPS) {
1739 // Check arguments.
1740 if (mh.is_null() || original_m.is_null()) {
1741 THROW(vmSymbols::java_lang_InternalError());
1742 }
1744 KlassHandle receiver_klass;
1745 {
1746 oop receiver_oop = java_lang_invoke_BoundMethodHandle::argument(mh());
1747 if (receiver_oop != NULL)
1748 receiver_klass = KlassHandle(THREAD, receiver_oop->klass());
1749 }
1750 methodHandle m = dispatch_decoded_method(original_m,
1751 receiver_limit, decode_flags,
1752 receiver_klass,
1753 CHECK);
1754 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); }
1755 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); }
1757 int vmargslot = m->size_of_parameters() - 1;
1758 assert(java_lang_invoke_BoundMethodHandle::vmargslot(mh()) == vmargslot, "");
1760 if (VerifyMethodHandles) {
1761 verify_BoundMethodHandle_with_receiver(mh, m, CHECK);
1762 }
1764 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m());
1766 DEBUG_ONLY(KlassHandle junk1; int junk2);
1767 assert(MethodHandles::decode_method(mh(), junk1, junk2) == m, "properly stored for later decoding");
1768 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot");
1770 // Done!
1771 java_lang_invoke_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh));
1772 }
1774 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
1775 bool direct_to_method, TRAPS) {
1776 ResourceMark rm;
1777 Handle ptype_handle(THREAD,
1778 java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum));
1779 KlassHandle ptype_klass;
1780 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass);
1781 int slots_pushed = type2size[ptype];
1783 oop argument = java_lang_invoke_BoundMethodHandle::argument(mh());
1785 const char* err = NULL;
1787 switch (ptype) {
1788 case T_OBJECT:
1789 if (argument != NULL)
1790 // we must implicitly convert from the arg type to the outgoing ptype
1791 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum);
1792 break;
1794 case T_ARRAY: case T_VOID:
1795 assert(false, "array, void do not appear here");
1796 default:
1797 if (ptype != T_INT && !is_subword_type(ptype)) {
1798 err = "unexpected parameter type";
1799 break;
1800 }
1801 // check subrange of Integer.value, if necessary
1802 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) {
1803 err = "bound integer argument must be of type java.lang.Integer";
1804 break;
1805 }
1806 if (ptype != T_INT) {
1807 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
1808 jint value = argument->int_field(value_offset);
1809 int vminfo = adapter_unbox_subword_vminfo(ptype);
1810 jint subword = truncate_subword_from_vminfo(value, vminfo);
1811 if (value != subword) {
1812 err = "bound subword value does not fit into the subword type";
1813 break;
1814 }
1815 }
1816 break;
1817 case T_FLOAT:
1818 case T_DOUBLE:
1819 case T_LONG:
1820 {
1821 // we must implicitly convert from the unboxed arg type to the outgoing ptype
1822 BasicType argbox = java_lang_boxing_object::basic_type(argument);
1823 if (argbox != ptype) {
1824 err = check_argument_type_change(T_OBJECT, (argument == NULL
1825 ? SystemDictionary::Object_klass()
1826 : argument->klass()),
1827 ptype, ptype_klass(), argnum);
1828 assert(err != NULL, "this must be an error");
1829 }
1830 break;
1831 }
1832 }
1834 if (err == NULL) {
1835 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1836 if (direct_to_method) {
1837 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots");
1838 } else {
1839 int target_pushes = decode_MethodHandle_stack_pushes(target());
1840 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct");
1841 }
1842 }
1844 if (err == NULL) {
1845 // Verify the rest of the method type.
1846 err = check_method_type_insertion(java_lang_invoke_MethodHandle::type(mh()),
1847 argnum, ptype_handle(),
1848 java_lang_invoke_MethodHandle::type(target()));
1849 }
1851 if (err != NULL) {
1852 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1853 }
1854 }
1856 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
1857 // Check arguments.
1858 if (mh.is_null() || target.is_null() || !java_lang_invoke_MethodHandle::is_instance(target())) {
1859 THROW(vmSymbols::java_lang_InternalError());
1860 }
1862 int argslot = java_lang_invoke_BoundMethodHandle::vmargslot(mh());
1864 if (VerifyMethodHandles) {
1865 int insert_after = argnum - 1;
1866 verify_vmargslot(mh, insert_after, argslot, CHECK);
1867 verify_vmslots(mh, CHECK);
1868 }
1870 // Get bound type and required slots.
1871 BasicType ptype;
1872 {
1873 oop ptype_oop = java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum);
1874 ptype = java_lang_Class::as_BasicType(ptype_oop);
1875 }
1876 int slots_pushed = type2size[ptype];
1878 // If (a) the target is a direct non-dispatched method handle,
1879 // or (b) the target is a dispatched direct method handle and we
1880 // are binding the receiver, cut out the middle-man.
1881 // Do this by decoding the DMH and using its methodOop directly as vmtarget.
1882 bool direct_to_method = false;
1883 if (OptimizeMethodHandles &&
1884 target->klass() == SystemDictionary::DirectMethodHandle_klass() &&
1885 (argnum != 0 || java_lang_invoke_BoundMethodHandle::argument(mh()) != NULL) &&
1886 (argnum == 0 || java_lang_invoke_DirectMethodHandle::vmindex(target()) < 0)) {
1887 KlassHandle receiver_limit; int decode_flags = 0;
1888 methodHandle m = decode_method(target(), receiver_limit, decode_flags);
1889 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); }
1890 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg.
1891 assert(java_lang_invoke_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig");
1892 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) {
1893 init_BoundMethodHandle_with_receiver(mh, m,
1894 receiver_limit, decode_flags,
1895 CHECK);
1896 return;
1897 }
1899 // Even if it is not a bound receiver, we still might be able
1900 // to bind another argument and still invoke the methodOop directly.
1901 if (!(decode_flags & _dmf_does_dispatch)) {
1902 direct_to_method = true;
1903 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m());
1904 }
1905 }
1906 if (!direct_to_method)
1907 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), target());
1909 if (VerifyMethodHandles) {
1910 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK);
1911 }
1913 // Next question: Is this a ref, int, or long bound value?
1914 MethodHandleEntry* me = NULL;
1915 if (ptype == T_OBJECT) {
1916 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh);
1917 else me = MethodHandles::entry(_bound_ref_mh);
1918 } else if (slots_pushed == 2) {
1919 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh);
1920 else me = MethodHandles::entry(_bound_long_mh);
1921 } else if (slots_pushed == 1) {
1922 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh);
1923 else me = MethodHandles::entry(_bound_int_mh);
1924 } else {
1925 assert(false, "");
1926 }
1928 // Done!
1929 java_lang_invoke_MethodHandle::set_vmentry(mh(), me);
1930 }
1932 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) {
1933 char msg[200];
1934 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err);
1935 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg);
1936 }
1938 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) {
1939 ResourceMark rm;
1940 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
1941 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
1943 verify_vmargslot(mh, argnum, argslot, CHECK);
1944 verify_vmslots(mh, CHECK);
1946 jint conv_op = adapter_conversion_op(conversion);
1947 if (!conv_op_valid(conv_op)) {
1948 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD);
1949 return;
1950 }
1951 EntryKind ek = adapter_entry_kind(conv_op);
1953 int stack_move = adapter_conversion_stack_move(conversion);
1954 BasicType src = adapter_conversion_src_type(conversion);
1955 BasicType dest = adapter_conversion_dest_type(conversion);
1956 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
1958 Handle argument(THREAD, java_lang_invoke_AdapterMethodHandle::argument(mh()));
1959 Handle target(THREAD, java_lang_invoke_AdapterMethodHandle::vmtarget(mh()));
1960 Handle src_mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1961 Handle dst_mtype(THREAD, java_lang_invoke_MethodHandle::type(target()));
1962 Handle arg_mtype;
1964 const char* err = NULL;
1966 if (err == NULL) {
1967 // Check that the correct argument is supplied, but only if it is required.
1968 switch (ek) {
1969 case _adapter_check_cast: // target type of cast
1970 case _adapter_ref_to_prim: // wrapper type from which to unbox
1971 case _adapter_spread_args: // array type to spread from
1972 if (!java_lang_Class::is_instance(argument())
1973 || java_lang_Class::is_primitive(argument()))
1974 { err = "adapter requires argument of type java.lang.Class"; break; }
1975 if (ek == _adapter_spread_args) {
1976 // Make sure it is a suitable collection type. (Array, for now.)
1977 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument()));
1978 if (!ak->oop_is_array())
1979 { err = "spread adapter requires argument representing an array class"; break; }
1980 BasicType et = arrayKlass::cast(ak->as_klassOop())->element_type();
1981 if (et != dest && stack_move <= 0)
1982 { err = "spread adapter requires array class argument of correct type"; break; }
1983 }
1984 break;
1985 case _adapter_prim_to_ref: // boxer MH to use
1986 case _adapter_collect_args: // method handle which collects the args
1987 case _adapter_fold_args: // method handle which collects the args
1988 if (!UseRicochetFrames) {
1989 { err = "box/collect/fold operators are not supported"; break; }
1990 }
1991 if (!java_lang_invoke_MethodHandle::is_instance(argument()))
1992 { err = "MethodHandle adapter argument required"; break; }
1993 arg_mtype = Handle(THREAD, java_lang_invoke_MethodHandle::type(argument()));
1994 break;
1995 default:
1996 if (argument.not_null())
1997 { err = "adapter has spurious argument"; break; }
1998 break;
1999 }
2000 }
2002 if (err == NULL) {
2003 // Check that the src/dest types are supplied if needed.
2004 // Also check relevant parameter or return types.
2005 switch (ek) {
2006 case _adapter_check_cast:
2007 if (src != T_OBJECT || dest != T_OBJECT) {
2008 err = "adapter requires object src/dest conversion subfields";
2009 }
2010 break;
2011 case _adapter_prim_to_prim:
2012 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) {
2013 err = "adapter requires primitive src/dest conversion subfields"; break;
2014 }
2015 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) ||
2016 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) {
2017 err = "adapter cannot convert beween floating and fixed-point"; break;
2018 }
2019 break;
2020 case _adapter_ref_to_prim:
2021 if (src != T_OBJECT || !is_java_primitive(dest)
2022 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) {
2023 err = "adapter requires primitive dest conversion subfield"; break;
2024 }
2025 break;
2026 case _adapter_prim_to_ref:
2027 if (!is_java_primitive(src) || dest != T_OBJECT) {
2028 err = "adapter requires primitive src conversion subfield"; break;
2029 }
2030 break;
2031 case _adapter_swap_args:
2032 {
2033 if (!src || !dest) {
2034 err = "adapter requires src/dest conversion subfields for swap"; break;
2035 }
2036 int src_size = type2size[src];
2037 if (src_size != type2size[dest]) {
2038 err = "adapter requires equal sizes for src/dest"; break;
2039 }
2040 int src_slot = argslot;
2041 int dest_slot = vminfo;
2042 int src_arg = argnum;
2043 int dest_arg = argument_slot_to_argnum(src_mtype(), dest_slot);
2044 verify_vmargslot(mh, dest_arg, dest_slot, CHECK);
2045 if (!(dest_slot >= src_slot + src_size) &&
2046 !(src_slot >= dest_slot + src_size)) {
2047 err = "source, destination slots must be distinct"; break;
2048 } else if (!(src_slot > dest_slot)) {
2049 err = "source of swap must be deeper in stack"; break;
2050 }
2051 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), dest_arg),
2052 java_lang_invoke_MethodType::ptype(dst_mtype(), src_arg),
2053 dest_arg);
2054 if (err == NULL)
2055 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), src_arg),
2056 java_lang_invoke_MethodType::ptype(dst_mtype(), dest_arg),
2057 src_arg);
2058 break;
2059 }
2060 case _adapter_rot_args:
2061 {
2062 if (!src || !dest) {
2063 err = "adapter requires src/dest conversion subfields for rotate"; break;
2064 }
2065 int src_slot = argslot;
2066 int limit_raw = vminfo;
2067 bool rot_down = (src_slot < limit_raw);
2068 int limit_bias = (rot_down ? MethodHandles::OP_ROT_ARGS_DOWN_LIMIT_BIAS : 0);
2069 int limit_slot = limit_raw - limit_bias;
2070 int src_arg = argnum;
2071 int limit_arg = argument_slot_to_argnum(src_mtype(), limit_slot);
2072 verify_vmargslot(mh, limit_arg, limit_slot, CHECK);
2073 if (src_slot == limit_slot) {
2074 err = "source, destination slots must be distinct"; break;
2075 }
2076 if (!rot_down) { // rotate slots up == shift arguments left
2077 // limit_slot is an inclusive lower limit
2078 assert((src_slot > limit_slot) && (src_arg < limit_arg), "");
2079 // rotate up: [limit_slot..src_slot-ss] --> [limit_slot+ss..src_slot]
2080 // that is: [src_arg+1..limit_arg] --> [src_arg..limit_arg-1]
2081 for (int i = src_arg+1; i <= limit_arg && err == NULL; i++) {
2082 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), i),
2083 java_lang_invoke_MethodType::ptype(dst_mtype(), i-1),
2084 i);
2085 }
2086 } else { // rotate slots down == shfit arguments right
2087 // limit_slot is an exclusive upper limit
2088 assert((src_slot < limit_slot - limit_bias) && (src_arg > limit_arg + limit_bias), "");
2089 // rotate down: [src_slot+ss..limit_slot) --> [src_slot..limit_slot-ss)
2090 // that is: (limit_arg..src_arg-1] --> (dst_arg+1..src_arg]
2091 for (int i = limit_arg+1; i <= src_arg-1 && err == NULL; i++) {
2092 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), i),
2093 java_lang_invoke_MethodType::ptype(dst_mtype(), i+1),
2094 i);
2095 }
2096 }
2097 if (err == NULL) {
2098 int dest_arg = (rot_down ? limit_arg+1 : limit_arg);
2099 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), src_arg),
2100 java_lang_invoke_MethodType::ptype(dst_mtype(), dest_arg),
2101 src_arg);
2102 }
2103 }
2104 break;
2105 case _adapter_spread_args:
2106 case _adapter_collect_args:
2107 case _adapter_fold_args:
2108 {
2109 bool is_spread = (ek == _adapter_spread_args);
2110 bool is_fold = (ek == _adapter_fold_args);
2111 BasicType coll_type = is_spread ? src : dest;
2112 BasicType elem_type = is_spread ? dest : src;
2113 // coll_type is type of args in collected form (or T_VOID if none)
2114 // elem_type is common type of args in spread form (or T_VOID if missing or heterogeneous)
2115 if (coll_type == 0 || elem_type == 0) {
2116 err = "adapter requires src/dest subfields for spread or collect"; break;
2117 }
2118 if (is_spread && coll_type != T_OBJECT) {
2119 err = "spread adapter requires object type for argument bundle"; break;
2120 }
2121 Handle spread_mtype = (is_spread ? dst_mtype : src_mtype);
2122 int spread_slot = argslot;
2123 int spread_arg = argnum;
2124 int slots_pushed = stack_move / stack_move_unit();
2125 int coll_slot_count = type2size[coll_type];
2126 int spread_slot_count = (is_spread ? slots_pushed : -slots_pushed) + coll_slot_count;
2127 if (is_fold) spread_slot_count = argument_slot_count(arg_mtype());
2128 if (!is_spread) {
2129 int init_slots = argument_slot_count(src_mtype());
2130 int coll_slots = argument_slot_count(arg_mtype());
2131 if (spread_slot_count > init_slots ||
2132 spread_slot_count != coll_slots) {
2133 err = "collect adapter has inconsistent arg counts"; break;
2134 }
2135 int next_slots = argument_slot_count(dst_mtype());
2136 int unchanged_slots_in = (init_slots - spread_slot_count);
2137 int unchanged_slots_out = (next_slots - coll_slot_count - (is_fold ? spread_slot_count : 0));
2138 if (unchanged_slots_in != unchanged_slots_out) {
2139 err = "collect adapter continuation has inconsistent arg counts"; break;
2140 }
2141 }
2142 }
2143 break;
2144 default:
2145 if (src != 0 || dest != 0) {
2146 err = "adapter has spurious src/dest conversion subfields"; break;
2147 }
2148 break;
2149 }
2150 }
2152 if (err == NULL) {
2153 // Check the stack_move subfield.
2154 // It must always report the net change in stack size, positive or negative.
2155 int slots_pushed = stack_move / stack_move_unit();
2156 switch (ek) {
2157 case _adapter_prim_to_prim:
2158 case _adapter_ref_to_prim:
2159 case _adapter_prim_to_ref:
2160 if (slots_pushed != type2size[dest] - type2size[src]) {
2161 err = "wrong stack motion for primitive conversion";
2162 }
2163 break;
2164 case _adapter_dup_args:
2165 if (slots_pushed <= 0) {
2166 err = "adapter requires conversion subfield slots_pushed > 0";
2167 }
2168 break;
2169 case _adapter_drop_args:
2170 if (slots_pushed >= 0) {
2171 err = "adapter requires conversion subfield slots_pushed < 0";
2172 }
2173 break;
2174 case _adapter_collect_args:
2175 case _adapter_fold_args:
2176 if (slots_pushed > 2) {
2177 err = "adapter requires conversion subfield slots_pushed <= 2";
2178 }
2179 break;
2180 case _adapter_spread_args:
2181 if (slots_pushed < -1) {
2182 err = "adapter requires conversion subfield slots_pushed >= -1";
2183 }
2184 break;
2185 default:
2186 if (stack_move != 0) {
2187 err = "adapter has spurious stack_move conversion subfield";
2188 }
2189 break;
2190 }
2191 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) {
2192 err = "stack_move conversion subfield must be multiple of stack_move_unit";
2193 }
2194 }
2196 if (err == NULL) {
2197 // Make sure this adapter's stack pushing is accurately recorded.
2198 int slots_pushed = stack_move / stack_move_unit();
2199 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh());
2200 int target_vmslots = java_lang_invoke_MethodHandle::vmslots(target());
2201 int target_pushes = decode_MethodHandle_stack_pushes(target());
2202 if (slots_pushed != (target_vmslots - this_vmslots)) {
2203 err = "stack_move inconsistent with previous and current MethodType vmslots";
2204 } else {
2205 int this_pushes = decode_MethodHandle_stack_pushes(mh());
2206 if (slots_pushed + target_pushes != this_pushes) {
2207 if (this_pushes == 0)
2208 err = "adapter push count not initialized";
2209 else
2210 err = "adapter push count is wrong";
2211 }
2212 }
2214 // While we're at it, check that the stack motion decoder works:
2215 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
2216 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct");
2217 }
2219 if (err == NULL && vminfo != 0) {
2220 switch (ek) {
2221 case _adapter_swap_args:
2222 case _adapter_rot_args:
2223 case _adapter_prim_to_ref:
2224 case _adapter_collect_args:
2225 case _adapter_fold_args:
2226 break; // OK
2227 default:
2228 err = "vminfo subfield is reserved to the JVM";
2229 }
2230 }
2232 // Do additional ad hoc checks.
2233 if (err == NULL) {
2234 switch (ek) {
2235 case _adapter_retype_only:
2236 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false);
2237 break;
2239 case _adapter_retype_raw:
2240 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true);
2241 break;
2243 case _adapter_check_cast:
2244 {
2245 // The actual value being checked must be a reference:
2246 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), argnum),
2247 object_java_mirror(), argnum);
2248 if (err != NULL) break;
2250 // The output of the cast must fit with the destination argument:
2251 Handle cast_class = argument;
2252 err = check_method_type_conversion(src_mtype(),
2253 argnum, cast_class(),
2254 dst_mtype());
2255 }
2256 break;
2258 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles
2259 }
2260 }
2262 if (err != NULL) {
2263 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
2264 return;
2265 }
2267 }
2269 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
2270 Handle argument = java_lang_invoke_AdapterMethodHandle::argument(mh());
2271 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
2272 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
2273 jint conv_op = adapter_conversion_op(conversion);
2275 // adjust the adapter code to the internal EntryKind enumeration:
2276 EntryKind ek_orig = adapter_entry_kind(conv_op);
2277 EntryKind ek_opt = ek_orig; // may be optimized
2278 EntryKind ek_try; // temp
2280 // Finalize the vmtarget field (Java initialized it to null).
2281 if (!java_lang_invoke_MethodHandle::is_instance(target())) {
2282 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD);
2283 return;
2284 }
2285 java_lang_invoke_AdapterMethodHandle::set_vmtarget(mh(), target());
2287 int stack_move = adapter_conversion_stack_move(conversion);
2288 BasicType src = adapter_conversion_src_type(conversion);
2289 BasicType dest = adapter_conversion_dest_type(conversion);
2290 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
2292 int slots_pushed = stack_move / stack_move_unit();
2294 if (VerifyMethodHandles) {
2295 verify_AdapterMethodHandle(mh, argnum, CHECK);
2296 }
2298 const char* err = NULL;
2300 if (!conv_op_supported(conv_op)) {
2301 err = "adapter not yet implemented in the JVM";
2302 }
2304 // Now it's time to finish the case analysis and pick a MethodHandleEntry.
2305 switch (ek_orig) {
2306 case _adapter_retype_only:
2307 case _adapter_retype_raw:
2308 case _adapter_check_cast:
2309 case _adapter_dup_args:
2310 case _adapter_drop_args:
2311 // these work fine via general case code
2312 break;
2314 case _adapter_prim_to_prim:
2315 {
2316 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}.
2317 // And, the {float,double} -> {int,long} cases must be handled by Java.
2318 switch (type2size[src] *4+ type2size[dest]) {
2319 case 1 *4+ 1:
2320 assert(src == T_INT || is_subword_type(src), "source is not float");
2321 // Subword-related cases are int -> {boolean,byte,char,short}.
2322 ek_opt = _adapter_opt_i2i;
2323 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2324 break;
2325 case 2 *4+ 1:
2326 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) {
2327 ek_opt = _adapter_opt_l2i;
2328 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2329 } else if (src == T_DOUBLE && dest == T_FLOAT) {
2330 ek_opt = _adapter_opt_d2f;
2331 } else {
2332 goto throw_not_impl; // runs user code, hence could block
2333 }
2334 break;
2335 case 1 *4+ 2:
2336 if ((src == T_INT || is_subword_type(src)) && dest == T_LONG) {
2337 ek_opt = _adapter_opt_i2l;
2338 } else if (src == T_FLOAT && dest == T_DOUBLE) {
2339 ek_opt = _adapter_opt_f2d;
2340 } else {
2341 goto throw_not_impl; // runs user code, hence could block
2342 }
2343 break;
2344 default:
2345 goto throw_not_impl; // runs user code, hence could block
2346 break;
2347 }
2348 }
2349 break;
2351 case _adapter_ref_to_prim:
2352 {
2353 switch (type2size[dest]) {
2354 case 1:
2355 ek_opt = _adapter_opt_unboxi;
2356 vminfo = adapter_unbox_subword_vminfo(dest);
2357 break;
2358 case 2:
2359 ek_opt = _adapter_opt_unboxl;
2360 break;
2361 default:
2362 goto throw_not_impl;
2363 break;
2364 }
2365 }
2366 break;
2368 case _adapter_prim_to_ref:
2369 {
2370 assert(UseRicochetFrames, "else don't come here");
2371 // vminfo will be the location to insert the return value
2372 vminfo = argslot;
2373 ek_opt = _adapter_opt_collect_ref;
2374 ensure_vmlayout_field(target, CHECK);
2375 // for MethodHandleWalk:
2376 if (java_lang_invoke_AdapterMethodHandle::is_instance(argument()))
2377 ensure_vmlayout_field(argument, CHECK);
2378 if (!OptimizeMethodHandles) break;
2379 switch (type2size[src]) {
2380 case 1:
2381 ek_try = EntryKind(_adapter_opt_filter_S0_ref + argslot);
2382 if (ek_try < _adapter_opt_collect_LAST &&
2383 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2384 assert(ek_adapter_opt_collect_count(ek_try) == 1 &&
2385 ek_adapter_opt_collect_type(ek_try) == T_OBJECT, "");
2386 ek_opt = ek_try;
2387 break;
2388 }
2389 // else downgrade to variable slot:
2390 ek_opt = _adapter_opt_collect_1_ref;
2391 break;
2392 case 2:
2393 ek_try = EntryKind(_adapter_opt_collect_2_S0_ref + argslot);
2394 if (ek_try < _adapter_opt_collect_LAST &&
2395 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2396 assert(ek_adapter_opt_collect_count(ek_try) == 2 &&
2397 ek_adapter_opt_collect_type(ek_try) == T_OBJECT, "");
2398 ek_opt = ek_try;
2399 break;
2400 }
2401 // else downgrade to variable slot:
2402 ek_opt = _adapter_opt_collect_2_ref;
2403 break;
2404 default:
2405 goto throw_not_impl;
2406 break;
2407 }
2408 }
2409 break;
2411 case _adapter_swap_args:
2412 case _adapter_rot_args:
2413 {
2414 int swap_slots = type2size[src];
2415 int src_slot = argslot;
2416 int dest_slot = vminfo;
2417 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1;
2418 switch (swap_slots) {
2419 case 1:
2420 ek_opt = (!rotate ? _adapter_opt_swap_1 :
2421 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down);
2422 break;
2423 case 2:
2424 ek_opt = (!rotate ? _adapter_opt_swap_2 :
2425 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down);
2426 break;
2427 default:
2428 goto throw_not_impl;
2429 break;
2430 }
2431 }
2432 break;
2434 case _adapter_spread_args:
2435 {
2436 #ifdef TARGET_ARCH_NYI_6939861
2437 // ports before 6939861 supported only three kinds of spread ops
2438 if (!UseRicochetFrames) {
2439 int array_size = slots_pushed + 1;
2440 assert(array_size >= 0, "");
2441 vminfo = array_size;
2442 switch (array_size) {
2443 case 0: ek_opt = _adapter_opt_spread_0; break;
2444 case 1: ek_opt = _adapter_opt_spread_1; break;
2445 default: ek_opt = _adapter_opt_spread_more; break;
2446 }
2447 break;
2448 }
2449 #endif //TARGET_ARCH_NYI_6939861
2450 // vminfo will be the required length of the array
2451 int array_size = (slots_pushed + 1) / (type2size[dest] == 2 ? 2 : 1);
2452 vminfo = array_size;
2453 // general case
2454 switch (dest) {
2455 case T_BOOLEAN : // fall through to T_BYTE:
2456 case T_BYTE : ek_opt = _adapter_opt_spread_byte; break;
2457 case T_CHAR : ek_opt = _adapter_opt_spread_char; break;
2458 case T_SHORT : ek_opt = _adapter_opt_spread_short; break;
2459 case T_INT : ek_opt = _adapter_opt_spread_int; break;
2460 case T_LONG : ek_opt = _adapter_opt_spread_long; break;
2461 case T_FLOAT : ek_opt = _adapter_opt_spread_float; break;
2462 case T_DOUBLE : ek_opt = _adapter_opt_spread_double; break;
2463 case T_OBJECT : ek_opt = _adapter_opt_spread_ref; break;
2464 case T_VOID : if (array_size != 0) goto throw_not_impl;
2465 ek_opt = _adapter_opt_spread_ref; break;
2466 default : goto throw_not_impl;
2467 }
2468 assert(array_size == 0 || // it doesn't matter what the spreader is
2469 (ek_adapter_opt_spread_count(ek_opt) == -1 &&
2470 (ek_adapter_opt_spread_type(ek_opt) == dest ||
2471 (ek_adapter_opt_spread_type(ek_opt) == T_BYTE && dest == T_BOOLEAN))),
2472 err_msg("dest=%d ek_opt=%d", dest, ek_opt));
2474 if (array_size <= 0) {
2475 // since the general case does not handle length 0, this case is required:
2476 ek_opt = _adapter_opt_spread_0;
2477 break;
2478 }
2479 if (dest == T_OBJECT) {
2480 ek_try = EntryKind(_adapter_opt_spread_1_ref - 1 + array_size);
2481 if (ek_try < _adapter_opt_spread_LAST &&
2482 ek_adapter_opt_spread_count(ek_try) == array_size) {
2483 assert(ek_adapter_opt_spread_type(ek_try) == dest, "");
2484 ek_opt = ek_try;
2485 break;
2486 }
2487 }
2488 break;
2489 }
2490 break;
2492 case _adapter_collect_args:
2493 {
2494 assert(UseRicochetFrames, "else don't come here");
2495 int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument()));
2496 // vminfo will be the location to insert the return value
2497 vminfo = argslot;
2498 ensure_vmlayout_field(target, CHECK);
2499 ensure_vmlayout_field(argument, CHECK);
2501 // general case:
2502 switch (dest) {
2503 default : if (!is_subword_type(dest)) goto throw_not_impl;
2504 // else fall through:
2505 case T_INT : ek_opt = _adapter_opt_collect_int; break;
2506 case T_LONG : ek_opt = _adapter_opt_collect_long; break;
2507 case T_FLOAT : ek_opt = _adapter_opt_collect_float; break;
2508 case T_DOUBLE : ek_opt = _adapter_opt_collect_double; break;
2509 case T_OBJECT : ek_opt = _adapter_opt_collect_ref; break;
2510 case T_VOID : ek_opt = _adapter_opt_collect_void; break;
2511 }
2512 assert(ek_adapter_opt_collect_slot(ek_opt) == -1 &&
2513 ek_adapter_opt_collect_count(ek_opt) == -1 &&
2514 (ek_adapter_opt_collect_type(ek_opt) == dest ||
2515 ek_adapter_opt_collect_type(ek_opt) == T_INT && is_subword_type(dest)),
2516 "");
2518 if (dest == T_OBJECT && elem_slots == 1 && OptimizeMethodHandles) {
2519 // filter operation on a ref
2520 ek_try = EntryKind(_adapter_opt_filter_S0_ref + argslot);
2521 if (ek_try < _adapter_opt_collect_LAST &&
2522 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2523 assert(ek_adapter_opt_collect_count(ek_try) == elem_slots &&
2524 ek_adapter_opt_collect_type(ek_try) == dest, "");
2525 ek_opt = ek_try;
2526 break;
2527 }
2528 ek_opt = _adapter_opt_collect_1_ref;
2529 break;
2530 }
2532 if (dest == T_OBJECT && elem_slots == 2 && OptimizeMethodHandles) {
2533 // filter of two arguments
2534 ek_try = EntryKind(_adapter_opt_collect_2_S0_ref + argslot);
2535 if (ek_try < _adapter_opt_collect_LAST &&
2536 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2537 assert(ek_adapter_opt_collect_count(ek_try) == elem_slots &&
2538 ek_adapter_opt_collect_type(ek_try) == dest, "");
2539 ek_opt = ek_try;
2540 break;
2541 }
2542 ek_opt = _adapter_opt_collect_2_ref;
2543 break;
2544 }
2546 if (dest == T_OBJECT && OptimizeMethodHandles) {
2547 // try to use a fixed length adapter
2548 ek_try = EntryKind(_adapter_opt_collect_0_ref + elem_slots);
2549 if (ek_try < _adapter_opt_collect_LAST &&
2550 ek_adapter_opt_collect_count(ek_try) == elem_slots) {
2551 assert(ek_adapter_opt_collect_slot(ek_try) == -1 &&
2552 ek_adapter_opt_collect_type(ek_try) == dest, "");
2553 ek_opt = ek_try;
2554 break;
2555 }
2556 }
2558 break;
2559 }
2561 case _adapter_fold_args:
2562 {
2563 assert(UseRicochetFrames, "else don't come here");
2564 int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument()));
2565 // vminfo will be the location to insert the return value
2566 vminfo = argslot + elem_slots;
2567 ensure_vmlayout_field(target, CHECK);
2568 ensure_vmlayout_field(argument, CHECK);
2570 switch (dest) {
2571 default : if (!is_subword_type(dest)) goto throw_not_impl;
2572 // else fall through:
2573 case T_INT : ek_opt = _adapter_opt_fold_int; break;
2574 case T_LONG : ek_opt = _adapter_opt_fold_long; break;
2575 case T_FLOAT : ek_opt = _adapter_opt_fold_float; break;
2576 case T_DOUBLE : ek_opt = _adapter_opt_fold_double; break;
2577 case T_OBJECT : ek_opt = _adapter_opt_fold_ref; break;
2578 case T_VOID : ek_opt = _adapter_opt_fold_void; break;
2579 }
2580 assert(ek_adapter_opt_collect_slot(ek_opt) == -1 &&
2581 ek_adapter_opt_collect_count(ek_opt) == -1 &&
2582 (ek_adapter_opt_collect_type(ek_opt) == dest ||
2583 ek_adapter_opt_collect_type(ek_opt) == T_INT && is_subword_type(dest)),
2584 "");
2586 if (dest == T_OBJECT && elem_slots == 0 && OptimizeMethodHandles) {
2587 // if there are no args, just pretend it's a collect
2588 ek_opt = _adapter_opt_collect_0_ref;
2589 break;
2590 }
2592 if (dest == T_OBJECT && OptimizeMethodHandles) {
2593 // try to use a fixed length adapter
2594 ek_try = EntryKind(_adapter_opt_fold_1_ref - 1 + elem_slots);
2595 if (ek_try < _adapter_opt_fold_LAST &&
2596 ek_adapter_opt_collect_count(ek_try) == elem_slots) {
2597 assert(ek_adapter_opt_collect_slot(ek_try) == -1 &&
2598 ek_adapter_opt_collect_type(ek_try) == dest, "");
2599 ek_opt = ek_try;
2600 break;
2601 }
2602 }
2604 break;
2605 }
2607 default:
2608 // should have failed much earlier; must be a missing case here
2609 assert(false, "incomplete switch");
2610 // and fall through:
2612 throw_not_impl:
2613 if (err == NULL)
2614 err = "unknown adapter type";
2615 break;
2616 }
2618 if (err == NULL && (vminfo & CONV_VMINFO_MASK) != vminfo) {
2619 // should not happen, since vminfo is used to encode arg/slot indexes < 255
2620 err = "vminfo overflow";
2621 }
2623 if (err == NULL && !have_entry(ek_opt)) {
2624 err = "adapter stub for this kind of method handle is missing";
2625 }
2627 if (err == NULL && ek_opt == ek_orig) {
2628 switch (ek_opt) {
2629 case _adapter_prim_to_prim:
2630 case _adapter_ref_to_prim:
2631 case _adapter_prim_to_ref:
2632 case _adapter_swap_args:
2633 case _adapter_rot_args:
2634 case _adapter_collect_args:
2635 case _adapter_fold_args:
2636 case _adapter_spread_args:
2637 // should be handled completely by optimized cases; see above
2638 err = "init_AdapterMethodHandle should not issue this";
2639 break;
2640 }
2641 }
2643 if (err != NULL) {
2644 throw_InternalError_for_bad_conversion(conversion, err_msg("%s: conv_op %d ek_opt %d", err, conv_op, ek_opt), THREAD);
2645 return;
2646 }
2648 // Rebuild the conversion value; maybe parts of it were changed.
2649 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo);
2651 // Finalize the conversion field. (Note that it is final to Java code.)
2652 java_lang_invoke_AdapterMethodHandle::set_conversion(mh(), new_conversion);
2654 if (java_lang_invoke_CountingMethodHandle::is_instance(mh())) {
2655 assert(ek_orig == _adapter_retype_only, "only one handled");
2656 ek_opt = _adapter_opt_profiling;
2657 }
2659 // Done!
2660 java_lang_invoke_MethodHandle::set_vmentry(mh(), entry(ek_opt));
2662 // There should be enough memory barriers on exit from native methods
2663 // to ensure that the MH is fully initialized to all threads before
2664 // Java code can publish it in global data structures.
2665 }
2667 void MethodHandles::ensure_vmlayout_field(Handle target, TRAPS) {
2668 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(target()));
2669 Handle mtform(THREAD, java_lang_invoke_MethodType::form(mtype()));
2670 if (mtform.is_null()) { THROW(vmSymbols::java_lang_InternalError()); }
2671 if (java_lang_invoke_MethodTypeForm::vmlayout_offset_in_bytes() > 0) {
2672 if (java_lang_invoke_MethodTypeForm::vmlayout(mtform()) == NULL) {
2673 // fill it in
2674 Handle erased_mtype(THREAD, java_lang_invoke_MethodTypeForm::erasedType(mtform()));
2675 TempNewSymbol erased_signature
2676 = java_lang_invoke_MethodType::as_signature(erased_mtype(), /*intern:*/true, CHECK);
2677 methodOop cookie
2678 = SystemDictionary::find_method_handle_invoke(vmSymbols::invokeExact_name(),
2679 erased_signature,
2680 SystemDictionaryHandles::Object_klass(),
2681 THREAD);
2682 java_lang_invoke_MethodTypeForm::init_vmlayout(mtform(), cookie);
2683 }
2684 }
2685 assert(java_lang_invoke_MethodTypeForm::vmslots(mtform()) == argument_slot_count(mtype()), "must agree");
2686 }
2688 #ifdef ASSERT
2690 extern "C"
2691 void print_method_handle(oop mh);
2693 static void stress_method_handle_walk_impl(Handle mh, TRAPS) {
2694 if (StressMethodHandleWalk) {
2695 // Exercise the MethodHandleWalk code in various ways and validate
2696 // the resulting method oop. Some of these produce output so they
2697 // are guarded under Verbose.
2698 ResourceMark rm;
2699 HandleMark hm;
2700 if (Verbose) {
2701 print_method_handle(mh());
2702 }
2703 TempNewSymbol name = SymbolTable::new_symbol("invoke", CHECK);
2704 Handle mt = java_lang_invoke_MethodHandle::type(mh());
2705 TempNewSymbol signature = java_lang_invoke_MethodType::as_signature(mt(), true, CHECK);
2706 MethodHandleCompiler mhc(mh, name, signature, 10000, false, CHECK);
2707 methodHandle m = mhc.compile(CHECK);
2708 if (Verbose) {
2709 m->print_codes();
2710 }
2711 InterpreterOopMap mask;
2712 OopMapCache::compute_one_oop_map(m, m->code_size() - 1, &mask);
2713 // compile to object code if -Xcomp or WizardMode
2714 if ((WizardMode ||
2715 CompilationPolicy::must_be_compiled(m))
2716 && !instanceKlass::cast(m->method_holder())->is_not_initialized()
2717 && CompilationPolicy::can_be_compiled(m)) {
2718 // Force compilation
2719 CompileBroker::compile_method(m, InvocationEntryBci,
2720 CompilationPolicy::policy()->initial_compile_level(),
2721 methodHandle(), 0, "StressMethodHandleWalk",
2722 CHECK);
2723 }
2724 }
2725 }
2727 static void stress_method_handle_walk(Handle mh, TRAPS) {
2728 stress_method_handle_walk_impl(mh, THREAD);
2729 if (HAS_PENDING_EXCEPTION) {
2730 oop ex = PENDING_EXCEPTION;
2731 CLEAR_PENDING_EXCEPTION;
2732 tty->print("StressMethodHandleWalk: ");
2733 java_lang_Throwable::print(ex, tty);
2734 tty->cr();
2735 }
2736 }
2737 #else
2739 static void stress_method_handle_walk(Handle mh, TRAPS) {}
2741 #endif
2743 //
2744 // Here are the native methods on sun.invoke.MethodHandleImpl.
2745 // They are the private interface between this JVM and the HotSpot-specific
2746 // Java code that implements JSR 292 method handles.
2747 //
2748 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
2749 // that intrinsic (non-JNI) native methods are defined in HotSpot.
2750 //
2752 // direct method handles for invokestatic or invokespecial
2753 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller);
2754 JVM_ENTRY(void, MHN_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2755 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) {
2756 ResourceMark rm; // for error messages
2758 // This is the guy we are initializing:
2759 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2760 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2762 // Early returns out of this method leave the DMH in an unfinished state.
2763 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2765 // which method are we really talking about?
2766 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2767 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2768 if (java_lang_invoke_MemberName::is_instance(target()) &&
2769 java_lang_invoke_MemberName::vmindex(target()) == VM_INDEX_UNINITIALIZED) {
2770 MethodHandles::resolve_MemberName(target, CHECK);
2771 }
2773 KlassHandle receiver_limit; int decode_flags = 0;
2774 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags);
2775 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); }
2777 // The trusted Java code that calls this method should already have performed
2778 // access checks on behalf of the given caller. But, we can verify this.
2779 if (VerifyMethodHandles && caller_jh != NULL) {
2780 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)));
2781 // If this were a bytecode, the first access check would be against
2782 // the "reference class" mentioned in the CONSTANT_Methodref.
2783 // We don't know at this point which class that was, and if we
2784 // check against m.method_holder we might get the wrong answer.
2785 // So we just make sure to handle this check when the resolution
2786 // happens, when we call resolve_MemberName.
2787 //
2788 // (A public class can inherit public members from private supers,
2789 // and it would be wrong to check access against the private super
2790 // if the original symbolic reference was against the public class.)
2791 //
2792 // If there were a bytecode, the next step would be to lookup the method
2793 // in the reference class, then then check the method's access bits.
2794 // Emulate LinkResolver::check_method_accessability.
2795 klassOop resolved_klass = m->method_holder();
2796 if (!Reflection::verify_field_access(caller->as_klassOop(),
2797 resolved_klass, resolved_klass,
2798 m->access_flags(),
2799 true)) {
2800 // %%% following cutout belongs in Reflection::verify_field_access?
2801 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(),
2802 resolved_klass, THREAD);
2803 if (!same_pm) {
2804 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string());
2805 }
2806 }
2807 }
2809 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK);
2810 stress_method_handle_walk(mh, CHECK);
2811 }
2812 JVM_END
2814 // bound method handles
2815 JVM_ENTRY(void, MHN_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2816 jobject target_jh, int argnum)) {
2817 ResourceMark rm; // for error messages
2819 // This is the guy we are initializing:
2820 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2821 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2823 // Early returns out of this method leave the BMH in an unfinished state.
2824 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2826 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2827 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2829 if (!java_lang_invoke_MethodHandle::is_instance(target())) {
2830 // Target object is a reflective method. (%%% Do we need this alternate path?)
2831 Untested("init_BMH of non-MH");
2832 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); }
2833 KlassHandle receiver_limit; int decode_flags = 0;
2834 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags);
2835 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m,
2836 receiver_limit,
2837 decode_flags,
2838 CHECK);
2839 } else {
2840 // Build a BMH on top of a DMH or another BMH:
2841 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK);
2842 }
2844 if (StressMethodHandleWalk) {
2845 if (mh->klass() == SystemDictionary::BoundMethodHandle_klass())
2846 stress_method_handle_walk(mh, CHECK);
2847 // else don't, since the subclass has not yet initialized its own fields
2848 }
2849 }
2850 JVM_END
2852 // adapter method handles
2853 JVM_ENTRY(void, MHN_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2854 jobject target_jh, int argnum)) {
2855 // This is the guy we are initializing:
2856 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2857 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2858 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2859 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2861 // Early returns out of this method leave the AMH in an unfinished state.
2862 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2864 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK);
2865 stress_method_handle_walk(mh, CHECK);
2866 }
2867 JVM_END
2869 // method type forms
2870 JVM_ENTRY(void, MHN_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) {
2871 if (erased_jh == NULL) return;
2872 if (TraceMethodHandles) {
2873 tty->print("creating MethodType form ");
2874 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH!
2875 // call Object.toString()
2876 Symbol* name = vmSymbols::toString_name();
2877 Symbol* sig = vmSymbols::void_string_signature();
2878 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh)));
2879 JavaValue result(T_OBJECT);
2880 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig,
2881 &args, CHECK);
2882 Handle str(THREAD, (oop)result.get_jobject());
2883 java_lang_String::print(str, tty);
2884 }
2885 tty->cr();
2886 }
2887 }
2888 JVM_END
2890 // debugging and reflection
2891 JVM_ENTRY(jobject, MHN_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) {
2892 Handle mh(THREAD, JNIHandles::resolve(mh_jh));
2893 if (!java_lang_invoke_MethodHandle::is_instance(mh())) {
2894 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
2895 }
2896 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL);
2897 return JNIHandles::make_local(THREAD, target);
2898 }
2899 JVM_END
2901 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
2902 switch (which) {
2903 case MethodHandles::GC_JVM_PUSH_LIMIT:
2904 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF,
2905 "MethodHandlePushLimit parameter must be in valid range");
2906 return MethodHandlePushLimit;
2907 case MethodHandles::GC_JVM_STACK_MOVE_UNIT:
2908 // return number of words per slot, signed according to stack direction
2909 return MethodHandles::stack_move_unit();
2910 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK:
2911 return MethodHandles::adapter_conversion_ops_supported_mask();
2912 case MethodHandles::GC_COUNT_GWT:
2913 #ifdef COMPILER2
2914 return true;
2915 #else
2916 return false;
2917 #endif
2918 }
2919 return 0;
2920 }
2921 JVM_END
2923 #ifndef PRODUCT
2924 #define EACH_NAMED_CON(template) \
2925 /* hold back this one until JDK stabilizes */ \
2926 /* template(MethodHandles,GC_JVM_PUSH_LIMIT) */ \
2927 /* hold back this one until JDK stabilizes */ \
2928 /* template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) */ \
2929 /* hold back this one until JDK stabilizes */ \
2930 /* template(MethodHandles,GC_OP_ROT_ARGS_DOWN_LIMIT_BIAS) */ \
2931 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \
2932 template(MethodHandles,ETF_DIRECT_HANDLE) \
2933 template(MethodHandles,ETF_METHOD_NAME) \
2934 template(MethodHandles,ETF_REFLECT_METHOD) \
2935 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
2936 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
2937 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
2938 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
2939 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
2940 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
2941 template(java_lang_invoke_MemberName,VM_INDEX_UNINITIALIZED) \
2942 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_ONLY) \
2943 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_RAW) \
2944 template(java_lang_invoke_AdapterMethodHandle,OP_CHECK_CAST) \
2945 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_PRIM) \
2946 template(java_lang_invoke_AdapterMethodHandle,OP_REF_TO_PRIM) \
2947 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_REF) \
2948 template(java_lang_invoke_AdapterMethodHandle,OP_SWAP_ARGS) \
2949 template(java_lang_invoke_AdapterMethodHandle,OP_ROT_ARGS) \
2950 template(java_lang_invoke_AdapterMethodHandle,OP_DUP_ARGS) \
2951 template(java_lang_invoke_AdapterMethodHandle,OP_DROP_ARGS) \
2952 template(java_lang_invoke_AdapterMethodHandle,OP_COLLECT_ARGS) \
2953 template(java_lang_invoke_AdapterMethodHandle,OP_SPREAD_ARGS) \
2954 /* hold back this one until JDK stabilizes */ \
2955 /*template(java_lang_invoke_AdapterMethodHandle,CONV_OP_LIMIT)*/ \
2956 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_MASK) \
2957 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_MASK) \
2958 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_SHIFT) \
2959 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_SHIFT) \
2960 template(java_lang_invoke_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \
2961 template(java_lang_invoke_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \
2962 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \
2963 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \
2964 /*end*/
2966 #define ONE_PLUS(scope,value) 1+
2967 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0;
2968 #define VALUE_COMMA(scope,value) scope::value,
2969 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 };
2970 #define STRING_NULL(scope,value) #value "\0"
2971 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) };
2973 #undef ONE_PLUS
2974 #undef VALUE_COMMA
2975 #undef STRING_NULL
2976 #undef EACH_NAMED_CON
2977 #endif
2979 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
2980 #ifndef PRODUCT
2981 if (which >= 0 && which < con_value_count) {
2982 int con = con_values[which];
2983 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
2984 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
2985 const char* str = &con_names[0];
2986 for (int i = 0; i < which; i++)
2987 str += strlen(str) + 1; // skip name and null
2988 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
2989 box->obj_at_put(0, name);
2990 }
2991 return con;
2992 }
2993 #endif
2994 return 0;
2995 }
2996 JVM_END
2998 // void init(MemberName self, AccessibleObject ref)
2999 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
3000 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
3001 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
3002 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
3003 oop target_oop = JNIHandles::resolve_non_null(target_jh);
3004 MethodHandles::init_MemberName(mname(), target_oop);
3005 }
3006 JVM_END
3008 // void expand(MemberName self)
3009 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
3010 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
3011 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
3012 MethodHandles::expand_MemberName(mname, 0, CHECK);
3013 }
3014 JVM_END
3016 // void resolve(MemberName self, Class<?> caller)
3017 JVM_ENTRY(void, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
3018 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
3019 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
3021 // The trusted Java code that calls this method should already have performed
3022 // access checks on behalf of the given caller. But, we can verify this.
3023 if (VerifyMethodHandles && caller_jh != NULL) {
3024 klassOop reference_klass = java_lang_Class::as_klassOop(java_lang_invoke_MemberName::clazz(mname()));
3025 if (reference_klass != NULL) {
3026 // Emulate LinkResolver::check_klass_accessability.
3027 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh));
3028 if (!Reflection::verify_class_access(caller,
3029 reference_klass,
3030 true)) {
3031 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name());
3032 }
3033 }
3034 }
3036 MethodHandles::resolve_MemberName(mname, CHECK);
3037 }
3038 JVM_END
3040 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
3041 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
3042 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
3043 jclass clazz_jh, jstring name_jh, jstring sig_jh,
3044 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
3045 if (clazz_jh == NULL || results_jh == NULL) return -1;
3046 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)));
3048 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
3049 if (results.is_null() || !results->is_objArray()) return -1;
3051 TempNewSymbol name = NULL;
3052 TempNewSymbol sig = NULL;
3053 if (name_jh != NULL) {
3054 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
3055 if (name == NULL) return 0; // a match is not possible
3056 }
3057 if (sig_jh != NULL) {
3058 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
3059 if (sig == NULL) return 0; // a match is not possible
3060 }
3062 KlassHandle caller;
3063 if (caller_jh != NULL) {
3064 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
3065 if (!java_lang_Class::is_instance(caller_oop)) return -1;
3066 caller = KlassHandle(THREAD, java_lang_Class::as_klassOop(caller_oop));
3067 }
3069 if (name != NULL && sig != NULL && results.not_null()) {
3070 // try a direct resolve
3071 // %%% TO DO
3072 }
3074 int res = MethodHandles::find_MemberNames(k(), name, sig, mflags,
3075 caller(), skip, results());
3076 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
3077 return res;
3078 }
3079 JVM_END
3081 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
3082 oop call_site = JNIHandles::resolve_non_null(call_site_jh);
3083 oop target = JNIHandles::resolve(target_jh);
3084 {
3085 // Walk all nmethods depending on this call site.
3086 MutexLocker mu(Compile_lock, thread);
3087 Universe::flush_dependents_on(call_site, target);
3088 }
3089 java_lang_invoke_CallSite::set_target(call_site, target);
3090 }
3091 JVM_END
3093 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
3094 oop call_site = JNIHandles::resolve_non_null(call_site_jh);
3095 oop target = JNIHandles::resolve(target_jh);
3096 {
3097 // Walk all nmethods depending on this call site.
3098 MutexLocker mu(Compile_lock, thread);
3099 Universe::flush_dependents_on(call_site, target);
3100 }
3101 java_lang_invoke_CallSite::set_target_volatile(call_site, target);
3102 }
3103 JVM_END
3105 methodOop MethodHandles::resolve_raise_exception_method(TRAPS) {
3106 if (_raise_exception_method != NULL) {
3107 // no need to do it twice
3108 return raise_exception_method();
3109 }
3110 // LinkResolver::resolve_invokedynamic can reach this point
3111 // because an invokedynamic has failed very early (7049415)
3112 KlassHandle MHN_klass = SystemDictionaryHandles::MethodHandleNatives_klass();
3113 if (MHN_klass.not_null()) {
3114 TempNewSymbol raiseException_name = SymbolTable::new_symbol("raiseException", CHECK_NULL);
3115 TempNewSymbol raiseException_sig = SymbolTable::new_symbol("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK_NULL);
3116 methodOop raiseException_method = instanceKlass::cast(MHN_klass->as_klassOop())
3117 ->find_method(raiseException_name, raiseException_sig);
3118 if (raiseException_method != NULL && raiseException_method->is_static()) {
3119 return raiseException_method;
3120 }
3121 }
3122 // not found; let the caller deal with it
3123 return NULL;
3124 }
3125 void MethodHandles::raise_exception(int code, oop actual, oop required, TRAPS) {
3126 methodOop raiseException_method = resolve_raise_exception_method(CHECK);
3127 if (raiseException_method != NULL &&
3128 instanceKlass::cast(raiseException_method->method_holder())->is_not_initialized()) {
3129 instanceKlass::cast(raiseException_method->method_holder())->initialize(CHECK);
3130 // it had better be resolved by now, or maybe JSR 292 failed to load
3131 raiseException_method = raise_exception_method();
3132 }
3133 if (raiseException_method == NULL) {
3134 THROW_MSG(vmSymbols::java_lang_InternalError(), "no raiseException method");
3135 }
3136 JavaCallArguments args;
3137 args.push_int(code);
3138 args.push_oop(actual);
3139 args.push_oop(required);
3140 JavaValue result(T_VOID);
3141 JavaCalls::call(&result, raiseException_method, &args, CHECK);
3142 }
3144 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) {
3145 TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL);
3146 THROW_MSG_NULL(UOE_name, "MethodHandle.invoke cannot be invoked reflectively");
3147 return NULL;
3148 }
3149 JVM_END
3151 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) {
3152 TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL);
3153 THROW_MSG_NULL(UOE_name, "MethodHandle.invokeExact cannot be invoked reflectively");
3154 return NULL;
3155 }
3156 JVM_END
3159 /// JVM_RegisterMethodHandleMethods
3161 #undef CS // Solaris builds complain
3163 #define LANG "Ljava/lang/"
3164 #define JLINV "Ljava/lang/invoke/"
3166 #define OBJ LANG"Object;"
3167 #define CLS LANG"Class;"
3168 #define STRG LANG"String;"
3169 #define CS JLINV"CallSite;"
3170 #define MT JLINV"MethodType;"
3171 #define MH JLINV"MethodHandle;"
3172 #define MEM JLINV"MemberName;"
3173 #define AMH JLINV"AdapterMethodHandle;"
3174 #define BMH JLINV"BoundMethodHandle;"
3175 #define DMH JLINV"DirectMethodHandle;"
3177 #define CC (char*) /*cast a literal from (const char*)*/
3178 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
3180 // These are the native methods on java.lang.invoke.MethodHandleNatives.
3181 static JNINativeMethod methods[] = {
3182 // void init(MemberName self, AccessibleObject ref)
3183 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHN_init_AMH)},
3184 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHN_init_BMH)},
3185 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHN_init_DMH)},
3186 {CC"init", CC"("MT")V", FN_PTR(MHN_init_MT)},
3187 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
3188 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
3189 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHN_resolve_Mem)},
3190 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHN_getTarget)},
3191 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
3192 // static native int getNamedCon(int which, Object[] name)
3193 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
3194 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
3195 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
3196 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}
3197 };
3199 static JNINativeMethod call_site_methods[] = {
3200 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
3201 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)}
3202 };
3204 static JNINativeMethod invoke_methods[] = {
3205 // void init(MemberName self, AccessibleObject ref)
3206 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
3207 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
3208 };
3210 // This one function is exported, used by NativeLookup.
3212 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
3213 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK");
3215 if (!EnableInvokeDynamic) {
3216 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
3217 return; // bind nothing
3218 }
3220 assert(!MethodHandles::enabled(), "must not be enabled");
3221 bool enable_MH = true;
3223 {
3224 ThreadToNativeFromVM ttnfv(thread);
3225 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod));
3226 if (!env->ExceptionOccurred()) {
3227 const char* L_MH_name = (JLINV "MethodHandle");
3228 const char* MH_name = L_MH_name+1;
3229 jclass MH_class = env->FindClass(MH_name);
3230 status = env->RegisterNatives(MH_class, invoke_methods, sizeof(invoke_methods)/sizeof(JNINativeMethod));
3231 }
3232 if (env->ExceptionOccurred()) {
3233 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
3234 enable_MH = false;
3235 env->ExceptionClear();
3236 }
3238 status = env->RegisterNatives(MHN_class, call_site_methods, sizeof(call_site_methods)/sizeof(JNINativeMethod));
3239 if (env->ExceptionOccurred()) {
3240 // Exception is okay until 7087357
3241 env->ExceptionClear();
3242 }
3243 }
3245 if (enable_MH) {
3246 methodOop raiseException_method = MethodHandles::resolve_raise_exception_method(CHECK);
3247 if (raiseException_method != NULL) {
3248 MethodHandles::set_raise_exception_method(raiseException_method);
3249 } else {
3250 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
3251 enable_MH = false;
3252 }
3253 }
3255 if (enable_MH) {
3256 MethodHandles::generate_adapters();
3257 MethodHandles::set_enabled(true);
3258 }
3259 }
3260 JVM_END