Thu, 23 Jun 2011 17:14:06 -0700
7056328: JSR 292 invocation sometimes fails in adapters for types not on boot class path
Reviewed-by: never
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.
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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 NULL
162 };
164 // Adapters.
165 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
167 jobject MethodHandles::_raise_exception_method;
169 address MethodHandles::_adapter_return_handlers[CONV_TYPE_MASK+1];
171 #ifdef ASSERT
172 bool MethodHandles::spot_check_entry_names() {
173 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), "");
174 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), "");
175 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), "");
176 assert(!strcmp(entry_name(_adapter_fold_args), "adapter_fold_args"), "");
177 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), "");
178 assert(!strcmp(entry_name(_adapter_opt_spread_char), "adapter_spread/char"), "");
179 assert(!strcmp(entry_name(_adapter_opt_spread_double), "adapter_spread/double"), "");
180 assert(!strcmp(entry_name(_adapter_opt_collect_int), "adapter_collect/int"), "");
181 assert(!strcmp(entry_name(_adapter_opt_collect_0_ref), "adapter_collect/0/ref"), "");
182 assert(!strcmp(entry_name(_adapter_opt_collect_2_S3_ref), "adapter_collect/2/S3/ref"), "");
183 assert(!strcmp(entry_name(_adapter_opt_filter_S5_ref), "adapter_filter/S5/ref"), "");
184 assert(!strcmp(entry_name(_adapter_opt_fold_3_ref), "adapter_fold/3/ref"), "");
185 assert(!strcmp(entry_name(_adapter_opt_fold_void), "adapter_fold/void"), "");
186 return true;
187 }
188 #endif
191 //------------------------------------------------------------------------------
192 // MethodHandles::generate_adapters
193 //
194 void MethodHandles::generate_adapters() {
195 #ifdef TARGET_ARCH_NYI_6939861
196 if (FLAG_IS_DEFAULT(UseRicochetFrames)) UseRicochetFrames = false;
197 #endif
198 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
200 assert(_adapter_code == NULL, "generate only once");
202 ResourceMark rm;
203 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
204 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
205 if (_adapter_code == NULL)
206 vm_exit_out_of_memory(adapter_code_size, "CodeCache: no room for MethodHandles adapters");
207 CodeBuffer code(_adapter_code);
208 MethodHandlesAdapterGenerator g(&code);
209 g.generate();
210 }
212 //------------------------------------------------------------------------------
213 // MethodHandlesAdapterGenerator::generate
214 //
215 void MethodHandlesAdapterGenerator::generate() {
216 // Generate generic method handle adapters.
217 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST;
218 ek < MethodHandles::_EK_LIMIT;
219 ek = MethodHandles::EntryKind(1 + (int)ek)) {
220 if (MethodHandles::ek_supported(ek)) {
221 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek));
222 MethodHandles::generate_method_handle_stub(_masm, ek);
223 }
224 }
225 }
228 #ifdef TARGET_ARCH_NYI_6939861
229 // these defs belong in methodHandles_<arch>.cpp
230 frame MethodHandles::ricochet_frame_sender(const frame& fr, RegisterMap *map) {
231 ShouldNotCallThis();
232 return fr;
233 }
234 void MethodHandles::ricochet_frame_oops_do(const frame& fr, OopClosure* f, const RegisterMap* reg_map) {
235 ShouldNotCallThis();
236 }
237 #endif //TARGET_ARCH_NYI_6939861
240 //------------------------------------------------------------------------------
241 // MethodHandles::ek_supported
242 //
243 bool MethodHandles::ek_supported(MethodHandles::EntryKind ek) {
244 MethodHandles::EntryKind ek_orig = MethodHandles::ek_original_kind(ek);
245 switch (ek_orig) {
246 case _adapter_unused_13:
247 return false; // not defined yet
248 case _adapter_prim_to_ref:
249 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF);
250 case _adapter_collect_args:
251 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS);
252 case _adapter_fold_args:
253 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS);
254 case _adapter_opt_return_any:
255 return UseRicochetFrames;
256 #ifdef TARGET_ARCH_NYI_6939861
257 // ports before 6939861 supported only three kinds of spread ops
258 case _adapter_spread_args:
259 // restrict spreads to three kinds:
260 switch (ek) {
261 case _adapter_opt_spread_0:
262 case _adapter_opt_spread_1:
263 case _adapter_opt_spread_more:
264 break;
265 default:
266 return false;
267 break;
268 }
269 break;
270 #endif //TARGET_ARCH_NYI_6939861
271 }
272 return true;
273 }
276 void MethodHandles::set_enabled(bool z) {
277 if (_enabled != z) {
278 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
279 _enabled = z;
280 }
281 }
283 // Note: A method which does not have a TRAPS argument cannot block in the GC
284 // or throw exceptions. Such methods are used in this file to do something quick
285 // and local, like parse a data structure. For speed, such methods work on plain
286 // oops, not handles. Trapping methods uniformly operate on handles.
288 methodHandle MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype,
289 KlassHandle& receiver_limit_result, int& decode_flags_result) {
290 if (vmtarget == NULL) return methodHandle();
291 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding");
292 if (vmindex < 0) {
293 // this DMH performs no dispatch; it is directly bound to a methodOop
294 // A MemberName may either be directly bound to a methodOop,
295 // or it may use the klass/index form; both forms mean the same thing.
296 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result);
297 if ((decode_flags_result & _dmf_has_receiver) != 0
298 && java_lang_invoke_MethodType::is_instance(mtype)) {
299 // Extract receiver type restriction from mtype.ptypes[0].
300 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype);
301 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0);
302 if (java_lang_Class::is_instance(ptype0))
303 receiver_limit_result = java_lang_Class::as_klassOop(ptype0);
304 }
305 if (vmindex == methodOopDesc::nonvirtual_vtable_index) {
306 // this DMH can be an "invokespecial" version
307 decode_flags_result &= ~_dmf_does_dispatch;
308 } else {
309 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?");
310 }
311 return m;
312 } else {
313 assert(vmtarget->is_klass(), "must be class or interface");
314 decode_flags_result |= MethodHandles::_dmf_does_dispatch;
315 decode_flags_result |= MethodHandles::_dmf_has_receiver;
316 receiver_limit_result = (klassOop)vmtarget;
317 Klass* tk = Klass::cast((klassOop)vmtarget);
318 if (tk->is_interface()) {
319 // an itable linkage is <interface, itable index>
320 decode_flags_result |= MethodHandles::_dmf_from_interface;
321 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex);
322 } else {
323 if (!tk->oop_is_instance())
324 tk = instanceKlass::cast(SystemDictionary::Object_klass());
325 return ((instanceKlass*)tk)->method_at_vtable(vmindex);
326 }
327 }
328 }
330 // MemberName and DirectMethodHandle have the same linkage to the JVM internals.
331 // (MemberName is the non-operational name used for queries and setup.)
333 methodHandle MethodHandles::decode_DirectMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
334 oop vmtarget = java_lang_invoke_DirectMethodHandle::vmtarget(mh);
335 int vmindex = java_lang_invoke_DirectMethodHandle::vmindex(mh);
336 oop mtype = java_lang_invoke_DirectMethodHandle::type(mh);
337 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result);
338 }
340 methodHandle MethodHandles::decode_BoundMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
341 assert(java_lang_invoke_BoundMethodHandle::is_instance(mh), "");
342 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), "");
343 for (oop bmh = mh;;) {
344 // Bound MHs can be stacked to bind several arguments.
345 oop target = java_lang_invoke_MethodHandle::vmtarget(bmh);
346 if (target == NULL) return methodHandle();
347 decode_flags_result |= MethodHandles::_dmf_binds_argument;
348 klassOop tk = target->klass();
349 if (tk == SystemDictionary::BoundMethodHandle_klass()) {
350 bmh = target;
351 continue;
352 } else {
353 if (java_lang_invoke_MethodHandle::is_subclass(tk)) {
354 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH");
355 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
356 } else {
357 // Optimized case: binding a receiver to a non-dispatched DMH
358 // short-circuits directly to the methodOop.
359 // (It might be another argument besides a receiver also.)
360 assert(target->is_method(), "must be a simple method");
361 decode_flags_result |= MethodHandles::_dmf_binds_method;
362 methodOop m = (methodOop) target;
363 if (!m->is_static())
364 decode_flags_result |= MethodHandles::_dmf_has_receiver;
365 return m;
366 }
367 }
368 }
369 }
371 methodHandle MethodHandles::decode_AdapterMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
372 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), "");
373 for (oop amh = mh;;) {
374 // Adapter MHs can be stacked to convert several arguments.
375 int conv_op = adapter_conversion_op(java_lang_invoke_AdapterMethodHandle::conversion(amh));
376 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK;
377 oop target = java_lang_invoke_MethodHandle::vmtarget(amh);
378 if (target == NULL) return methodHandle();
379 klassOop tk = target->klass();
380 if (tk == SystemDictionary::AdapterMethodHandle_klass()) {
381 amh = target;
382 continue;
383 } else {
384 // must be a BMH (which will bind some more arguments) or a DMH (for the final call)
385 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
386 }
387 }
388 }
390 methodHandle MethodHandles::decode_MethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
391 if (mh == NULL) return methodHandle();
392 klassOop mhk = mh->klass();
393 assert(java_lang_invoke_MethodHandle::is_subclass(mhk), "must be a MethodHandle");
394 if (mhk == SystemDictionary::DirectMethodHandle_klass()) {
395 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result);
396 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) {
397 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
398 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) {
399 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result);
400 } else if (java_lang_invoke_BoundMethodHandle::is_subclass(mhk)) {
401 // could be a JavaMethodHandle (but not an adapter MH)
402 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
403 } else {
404 assert(false, "cannot parse this MH");
405 return methodHandle(); // random MH?
406 }
407 }
409 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) {
410 assert(m->is_method(), "");
411 if (m->is_static()) {
412 // check that signature begins '(L' or '([' (not '(I', '()', etc.)
413 Symbol* sig = m->signature();
414 BasicType recv_bt = char2type(sig->byte_at(1));
415 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')'
416 assert(sig->byte_at(0) == '(', "must be method sig");
417 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY)
418 // decode_flags_result |= _dmf_has_receiver;
419 } else {
420 // non-static method
421 decode_flags_result |= _dmf_has_receiver;
422 if (!m->can_be_statically_bound() && !m->is_initializer()) {
423 decode_flags_result |= _dmf_does_dispatch;
424 if (Klass::cast(m->method_holder())->is_interface())
425 decode_flags_result |= _dmf_from_interface;
426 }
427 }
428 return m;
429 }
432 // A trusted party is handing us a cookie to determine a method.
433 // Let's boil it down to the method oop they really want.
434 methodHandle MethodHandles::decode_method(oop x, KlassHandle& receiver_limit_result, int& decode_flags_result) {
435 decode_flags_result = 0;
436 receiver_limit_result = KlassHandle();
437 klassOop xk = x->klass();
438 if (xk == Universe::methodKlassObj()) {
439 return decode_methodOop((methodOop) x, decode_flags_result);
440 } else if (xk == SystemDictionary::MemberName_klass()) {
441 // Note: This only works if the MemberName has already been resolved.
442 return decode_MemberName(x, receiver_limit_result, decode_flags_result);
443 } else if (java_lang_invoke_MethodHandle::is_subclass(xk)) {
444 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result);
445 } else if (xk == SystemDictionary::reflect_Method_klass()) {
446 oop clazz = java_lang_reflect_Method::clazz(x);
447 int slot = java_lang_reflect_Method::slot(x);
448 klassOop k = java_lang_Class::as_klassOop(clazz);
449 if (k != NULL && Klass::cast(k)->oop_is_instance())
450 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
451 decode_flags_result);
452 } else if (xk == SystemDictionary::reflect_Constructor_klass()) {
453 oop clazz = java_lang_reflect_Constructor::clazz(x);
454 int slot = java_lang_reflect_Constructor::slot(x);
455 klassOop k = java_lang_Class::as_klassOop(clazz);
456 if (k != NULL && Klass::cast(k)->oop_is_instance())
457 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
458 decode_flags_result);
459 } else {
460 // unrecognized object
461 assert(!x->is_method(), "already checked");
462 assert(!java_lang_invoke_MemberName::is_instance(x), "already checked");
463 }
464 return methodHandle();
465 }
468 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) {
469 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass())
470 return 0; // no push/pop
471 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh);
472 int last_vmslots = 0;
473 oop last_mh = mh;
474 for (;;) {
475 oop target = java_lang_invoke_MethodHandle::vmtarget(last_mh);
476 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
477 last_vmslots = java_lang_invoke_MethodHandle::vmslots(target);
478 break;
479 } else if (!java_lang_invoke_MethodHandle::is_instance(target)) {
480 // might be klass or method
481 assert(target->is_method(), "must get here with a direct ref to method");
482 last_vmslots = methodOop(target)->size_of_parameters();
483 break;
484 }
485 last_mh = target;
486 }
487 // If I am called with fewer VM slots than my ultimate callee,
488 // it must be that I push the additionally needed slots.
489 // Likewise if am called with more VM slots, I will pop them.
490 return (last_vmslots - this_vmslots);
491 }
494 // MemberName support
496 // import java_lang_invoke_MemberName.*
497 enum {
498 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
499 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
500 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
501 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
502 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
503 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
504 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE,
505 VM_INDEX_UNINITIALIZED = java_lang_invoke_MemberName::VM_INDEX_UNINITIALIZED
506 };
508 Handle MethodHandles::new_MemberName(TRAPS) {
509 Handle empty;
510 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
511 if (!k->is_initialized()) k->initialize(CHECK_(empty));
512 return Handle(THREAD, k->allocate_instance(THREAD));
513 }
515 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) {
516 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) {
517 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
518 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
519 int mods = java_lang_reflect_Field::modifiers(target_oop);
520 klassOop k = java_lang_Class::as_klassOop(clazz);
521 int offset = instanceKlass::cast(k)->offset_from_fields(slot);
522 init_MemberName(mname_oop, k, accessFlags_from(mods), offset);
523 } else {
524 KlassHandle receiver_limit; int decode_flags = 0;
525 methodHandle m = MethodHandles::decode_method(target_oop, receiver_limit, decode_flags);
526 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
527 init_MemberName(mname_oop, m(), do_dispatch);
528 }
529 }
531 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) {
532 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD)
533 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ));
534 oop vmtarget = m;
535 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet
536 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound())
537 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch
538 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value");
539 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
540 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
541 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
542 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror());
543 }
545 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) {
546 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ));
547 oop vmtarget = field_holder;
548 int vmindex = offset; // determines the field uniquely when combined with static bit
549 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex");
550 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
551 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
552 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
553 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror());
554 }
557 methodHandle MethodHandles::decode_MemberName(oop mname, KlassHandle& receiver_limit_result, int& decode_flags_result) {
558 methodHandle empty;
559 int flags = java_lang_invoke_MemberName::flags(mname);
560 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return empty; // not invocable
561 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname);
562 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
563 if (vmindex == VM_INDEX_UNINITIALIZED) return empty; // not resolved
564 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result);
565 oop clazz = java_lang_invoke_MemberName::clazz(mname);
566 if (clazz != NULL && java_lang_Class::is_instance(clazz)) {
567 klassOop klass = java_lang_Class::as_klassOop(clazz);
568 if (klass != NULL) receiver_limit_result = klass;
569 }
570 return m;
571 }
573 // convert the external string or reflective type to an internal signature
574 Symbol* MethodHandles::convert_to_signature(oop type_str, bool polymorphic, TRAPS) {
575 if (java_lang_invoke_MethodType::is_instance(type_str)) {
576 return java_lang_invoke_MethodType::as_signature(type_str, polymorphic, CHECK_NULL);
577 } else if (java_lang_Class::is_instance(type_str)) {
578 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
579 } else if (java_lang_String::is_instance(type_str)) {
580 if (polymorphic) {
581 return java_lang_String::as_symbol(type_str, CHECK_NULL);
582 } else {
583 return java_lang_String::as_symbol_or_null(type_str);
584 }
585 } else {
586 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
587 }
588 }
590 // An unresolved member name is a mere symbolic reference.
591 // Resolving it plants a vmtarget/vmindex in it,
592 // which refers dirctly to JVM internals.
593 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
594 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
595 #ifdef ASSERT
596 // If this assert throws, renegotiate the sentinel value used by the Java code,
597 // so that it is distinct from any valid vtable index value, and any special
598 // values defined in methodOopDesc::VtableIndexFlag.
599 // The point of the slop is to give the Java code and the JVM some room
600 // to independently specify sentinel values.
601 const int sentinel_slop = 10;
602 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop;
603 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels");
604 #endif
605 if (java_lang_invoke_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED)
606 return; // already resolved
607 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
608 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
609 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
610 int flags = java_lang_invoke_MemberName::flags(mname());
612 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
613 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve");
614 }
616 instanceKlassHandle defc;
617 {
618 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop());
619 if (defc_klassOop == NULL) return; // a primitive; no resolution possible
620 if (!Klass::cast(defc_klassOop)->oop_is_instance()) {
621 if (!Klass::cast(defc_klassOop)->oop_is_array()) return;
622 defc_klassOop = SystemDictionary::Object_klass();
623 }
624 defc = instanceKlassHandle(THREAD, defc_klassOop);
625 }
626 if (defc.is_null()) {
627 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class");
628 }
629 defc->link_class(CHECK); // possible safepoint
631 // convert the external string name to an internal symbol
632 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
633 if (name == NULL) return; // no such name
634 if (name == vmSymbols::class_initializer_name())
635 return; // illegal name
637 Handle polymorphic_method_type;
638 bool polymorphic_signature = false;
639 if ((flags & ALL_KINDS) == IS_METHOD &&
640 (defc() == SystemDictionary::MethodHandle_klass() &&
641 methodOopDesc::is_method_handle_invoke_name(name))) {
642 polymorphic_signature = true;
643 }
645 // convert the external string or reflective type to an internal signature
646 TempNewSymbol type = convert_to_signature(type_str(), polymorphic_signature, CHECK);
647 if (java_lang_invoke_MethodType::is_instance(type_str()) && polymorphic_signature) {
648 polymorphic_method_type = type_str; // preserve exactly
649 }
650 if (type == NULL) return; // no such signature exists in the VM
652 // Time to do the lookup.
653 switch (flags & ALL_KINDS) {
654 case IS_METHOD:
655 {
656 CallInfo result;
657 {
658 EXCEPTION_MARK;
659 if ((flags & JVM_ACC_STATIC) != 0) {
660 LinkResolver::resolve_static_call(result,
661 defc, name, type, KlassHandle(), false, false, THREAD);
662 } else if (defc->is_interface()) {
663 LinkResolver::resolve_interface_call(result, Handle(), defc,
664 defc, name, type, KlassHandle(), false, false, THREAD);
665 } else {
666 LinkResolver::resolve_virtual_call(result, Handle(), defc,
667 defc, name, type, KlassHandle(), false, false, THREAD);
668 }
669 if (HAS_PENDING_EXCEPTION) {
670 CLEAR_PENDING_EXCEPTION;
671 break; // go to second chance
672 }
673 }
674 methodHandle m = result.resolved_method();
675 oop vmtarget = NULL;
676 int vmindex = methodOopDesc::nonvirtual_vtable_index;
677 if (defc->is_interface()) {
678 vmindex = klassItable::compute_itable_index(m());
679 assert(vmindex >= 0, "");
680 } else if (result.has_vtable_index()) {
681 vmindex = result.vtable_index();
682 assert(vmindex >= 0, "");
683 }
684 assert(vmindex != VM_INDEX_UNINITIALIZED, "");
685 if (vmindex < 0) {
686 assert(result.is_statically_bound(), "");
687 vmtarget = m();
688 } else {
689 vmtarget = result.resolved_klass()->as_klassOop();
690 }
691 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
692 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
693 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
694 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
695 DEBUG_ONLY(KlassHandle junk1; int junk2);
696 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(),
697 "properly stored for later decoding");
698 return;
699 }
700 case IS_CONSTRUCTOR:
701 {
702 CallInfo result;
703 {
704 EXCEPTION_MARK;
705 if (name == vmSymbols::object_initializer_name()) {
706 LinkResolver::resolve_special_call(result,
707 defc, name, type, KlassHandle(), false, THREAD);
708 } else {
709 break; // will throw after end of switch
710 }
711 if (HAS_PENDING_EXCEPTION) {
712 CLEAR_PENDING_EXCEPTION;
713 return;
714 }
715 }
716 assert(result.is_statically_bound(), "");
717 methodHandle m = result.resolved_method();
718 oop vmtarget = m();
719 int vmindex = methodOopDesc::nonvirtual_vtable_index;
720 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
721 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
722 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
723 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
724 DEBUG_ONLY(KlassHandle junk1; int junk2);
725 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(),
726 "properly stored for later decoding");
727 return;
728 }
729 case IS_FIELD:
730 {
731 // This is taken from LinkResolver::resolve_field, sans access checks.
732 fieldDescriptor fd; // find_field initializes fd if found
733 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd));
734 // check if field exists; i.e., if a klass containing the field def has been selected
735 if (sel_klass.is_null()) return;
736 oop vmtarget = sel_klass->as_klassOop();
737 int vmindex = fd.offset();
738 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS);
739 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen
740 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
741 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
742 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
743 return;
744 }
745 default:
746 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
747 }
749 // Second chance.
750 if (polymorphic_method_type.not_null()) {
751 // Look on a non-null class loader.
752 Handle cur_class_loader;
753 const int nptypes = java_lang_invoke_MethodType::ptype_count(polymorphic_method_type());
754 for (int i = 0; i <= nptypes; i++) {
755 oop type_mirror;
756 if (i < nptypes) type_mirror = java_lang_invoke_MethodType::ptype(polymorphic_method_type(), i);
757 else type_mirror = java_lang_invoke_MethodType::rtype(polymorphic_method_type());
758 klassOop example_type = java_lang_Class::as_klassOop(type_mirror);
759 if (example_type == NULL) continue;
760 oop class_loader = Klass::cast(example_type)->class_loader();
761 if (class_loader == NULL || class_loader == cur_class_loader()) continue;
762 cur_class_loader = Handle(THREAD, class_loader);
763 methodOop m = SystemDictionary::find_method_handle_invoke(name,
764 type,
765 KlassHandle(THREAD, example_type),
766 THREAD);
767 if (HAS_PENDING_EXCEPTION) {
768 CLEAR_PENDING_EXCEPTION;
769 m = NULL;
770 // try again with a different class loader...
771 }
772 if (m != NULL &&
773 m->is_method_handle_invoke() &&
774 java_lang_invoke_MethodType::equals(polymorphic_method_type(), m->method_handle_type())) {
775 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
776 java_lang_invoke_MemberName::set_vmtarget(mname(), m);
777 java_lang_invoke_MemberName::set_vmindex(mname(), m->vtable_index());
778 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
779 return;
780 }
781 }
782 }
783 }
785 // Conversely, a member name which is only initialized from JVM internals
786 // may have null defc, name, and type fields.
787 // Resolving it plants a vmtarget/vmindex in it,
788 // which refers directly to JVM internals.
789 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
790 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
791 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
792 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
793 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) {
794 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
795 }
797 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
798 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
799 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
800 int flags = java_lang_invoke_MemberName::flags(mname());
802 if (suppress != 0) {
803 if (suppress & _suppress_defc) have_defc = true;
804 if (suppress & _suppress_name) have_name = true;
805 if (suppress & _suppress_type) have_type = true;
806 }
808 if (have_defc && have_name && have_type) return; // nothing needed
810 switch (flags & ALL_KINDS) {
811 case IS_METHOD:
812 case IS_CONSTRUCTOR:
813 {
814 KlassHandle receiver_limit; int decode_flags = 0;
815 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit, decode_flags);
816 if (m.is_null()) break;
817 if (!have_defc) {
818 klassOop defc = m->method_holder();
819 if (receiver_limit.not_null() && receiver_limit() != defc
820 && Klass::cast(receiver_limit())->is_subtype_of(defc))
821 defc = receiver_limit();
822 java_lang_invoke_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror());
823 }
824 if (!have_name) {
825 //not java_lang_String::create_from_symbol; let's intern member names
826 Handle name = StringTable::intern(m->name(), CHECK);
827 java_lang_invoke_MemberName::set_name(mname(), name());
828 }
829 if (!have_type) {
830 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
831 java_lang_invoke_MemberName::set_type(mname(), type());
832 }
833 return;
834 }
835 case IS_FIELD:
836 {
837 // This is taken from LinkResolver::resolve_field, sans access checks.
838 if (!vmtarget->is_klass()) break;
839 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break;
840 instanceKlassHandle defc(THREAD, (klassOop) vmtarget);
841 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
842 fieldDescriptor fd; // find_field initializes fd if found
843 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
844 break; // cannot expand
845 if (!have_defc) {
846 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
847 }
848 if (!have_name) {
849 //not java_lang_String::create_from_symbol; let's intern member names
850 Handle name = StringTable::intern(fd.name(), CHECK);
851 java_lang_invoke_MemberName::set_name(mname(), name());
852 }
853 if (!have_type) {
854 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
855 java_lang_invoke_MemberName::set_type(mname(), type());
856 }
857 return;
858 }
859 }
860 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
861 }
863 int MethodHandles::find_MemberNames(klassOop k,
864 Symbol* name, Symbol* sig,
865 int mflags, klassOop caller,
866 int skip, objArrayOop results) {
867 DEBUG_ONLY(No_Safepoint_Verifier nsv);
868 // this code contains no safepoints!
870 // %%% take caller into account!
872 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1;
874 int rfill = 0, rlimit = results->length(), rskip = skip;
875 // overflow measurement:
876 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
878 int match_flags = mflags;
879 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
880 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
881 bool local_only = !(search_superc | search_intfc);
882 bool classes_only = false;
884 if (name != NULL) {
885 if (name->utf8_length() == 0) return 0; // a match is not possible
886 }
887 if (sig != NULL) {
888 if (sig->utf8_length() == 0) return 0; // a match is not possible
889 if (sig->byte_at(0) == '(')
890 match_flags &= ~(IS_FIELD | IS_TYPE);
891 else
892 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
893 }
895 if ((match_flags & IS_TYPE) != 0) {
896 // NYI, and Core Reflection works quite well for this query
897 }
899 if ((match_flags & IS_FIELD) != 0) {
900 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
901 if (name != NULL && st.name() != name)
902 continue;
903 if (sig != NULL && st.signature() != sig)
904 continue;
905 // passed the filters
906 if (rskip > 0) {
907 --rskip;
908 } else if (rfill < rlimit) {
909 oop result = results->obj_at(rfill++);
910 if (!java_lang_invoke_MemberName::is_instance(result))
911 return -99; // caller bug!
912 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset());
913 } else if (++overflow >= overflow_limit) {
914 match_flags = 0; break; // got tired of looking at overflow
915 }
916 }
917 }
919 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
920 // watch out for these guys:
921 Symbol* init_name = vmSymbols::object_initializer_name();
922 Symbol* clinit_name = vmSymbols::class_initializer_name();
923 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
924 bool negate_name_test = false;
925 // fix name so that it captures the intention of IS_CONSTRUCTOR
926 if (!(match_flags & IS_METHOD)) {
927 // constructors only
928 if (name == NULL) {
929 name = init_name;
930 } else if (name != init_name) {
931 return 0; // no constructors of this method name
932 }
933 } else if (!(match_flags & IS_CONSTRUCTOR)) {
934 // methods only
935 if (name == NULL) {
936 name = init_name;
937 negate_name_test = true; // if we see the name, we *omit* the entry
938 } else if (name == init_name) {
939 return 0; // no methods of this constructor name
940 }
941 } else {
942 // caller will accept either sort; no need to adjust name
943 }
944 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
945 methodOop m = st.method();
946 Symbol* m_name = m->name();
947 if (m_name == clinit_name)
948 continue;
949 if (name != NULL && ((m_name != name) ^ negate_name_test))
950 continue;
951 if (sig != NULL && m->signature() != sig)
952 continue;
953 // passed the filters
954 if (rskip > 0) {
955 --rskip;
956 } else if (rfill < rlimit) {
957 oop result = results->obj_at(rfill++);
958 if (!java_lang_invoke_MemberName::is_instance(result))
959 return -99; // caller bug!
960 MethodHandles::init_MemberName(result, m, true);
961 } else if (++overflow >= overflow_limit) {
962 match_flags = 0; break; // got tired of looking at overflow
963 }
964 }
965 }
967 // return number of elements we at leasted wanted to initialize
968 return rfill + overflow;
969 }
972 // Decode this java.lang.Class object into an instanceKlass, if possible.
973 // Throw IAE if not
974 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) {
975 instanceKlassHandle empty;
976 klassOop caller = NULL;
977 if (java_lang_Class::is_instance(java_mirror_oop)) {
978 caller = java_lang_Class::as_klassOop(java_mirror_oop);
979 }
980 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) {
981 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty);
982 }
983 return instanceKlassHandle(THREAD, caller);
984 }
988 // Decode the vmtarget field of a method handle.
989 // Sanitize out methodOops, klassOops, and any other non-Java data.
990 // This is for debugging and reflection.
991 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) {
992 assert(java_lang_invoke_MethodHandle::is_instance(mh()), "must be a MH");
993 if (format == ETF_FORCE_DIRECT_HANDLE ||
994 format == ETF_COMPILE_DIRECT_HANDLE) {
995 // Internal function for stress testing.
996 Handle mt = java_lang_invoke_MethodHandle::type(mh());
997 int invocation_count = 10000;
998 TempNewSymbol signature = java_lang_invoke_MethodType::as_signature(mt(), true, CHECK_NULL);
999 bool omit_receiver_argument = true;
1000 MethodHandleCompiler mhc(mh, vmSymbols::invoke_name(), signature, invocation_count, omit_receiver_argument, CHECK_NULL);
1001 methodHandle m = mhc.compile(CHECK_NULL);
1002 if (StressMethodHandleWalk && Verbose || PrintMiscellaneous) {
1003 tty->print_cr("MethodHandleNatives.getTarget(%s)",
1004 format == ETF_FORCE_DIRECT_HANDLE ? "FORCE_DIRECT" : "COMPILE_DIRECT");
1005 if (Verbose) {
1006 m->print_codes();
1007 }
1008 }
1009 if (StressMethodHandleWalk) {
1010 InterpreterOopMap mask;
1011 OopMapCache::compute_one_oop_map(m, m->code_size() - 1, &mask);
1012 }
1013 if ((format == ETF_COMPILE_DIRECT_HANDLE ||
1014 CompilationPolicy::must_be_compiled(m))
1015 && !instanceKlass::cast(m->method_holder())->is_not_initialized()
1016 && CompilationPolicy::can_be_compiled(m)) {
1017 // Force compilation
1018 CompileBroker::compile_method(m, InvocationEntryBci,
1019 CompLevel_initial_compile,
1020 methodHandle(), 0, "MethodHandleNatives.getTarget",
1021 CHECK_NULL);
1022 }
1023 // Now wrap m in a DirectMethodHandle.
1024 instanceKlassHandle dmh_klass(THREAD, SystemDictionary::DirectMethodHandle_klass());
1025 Handle dmh = dmh_klass->allocate_instance_handle(CHECK_NULL);
1026 JavaValue ignore_result(T_VOID);
1027 Symbol* init_name = vmSymbols::object_initializer_name();
1028 Symbol* init_sig = vmSymbols::notifyGenericMethodType_signature();
1029 JavaCalls::call_special(&ignore_result, dmh,
1030 SystemDictionaryHandles::MethodHandle_klass(), init_name, init_sig,
1031 java_lang_invoke_MethodHandle::type(mh()), CHECK_NULL);
1032 MethodHandles::init_DirectMethodHandle(dmh, m, false, CHECK_NULL);
1033 return dmh();
1034 }
1035 if (format == ETF_HANDLE_OR_METHOD_NAME) {
1036 oop target = java_lang_invoke_MethodHandle::vmtarget(mh());
1037 if (target == NULL) {
1038 return NULL; // unformed MH
1039 }
1040 klassOop tklass = target->klass();
1041 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) {
1042 return target; // target is another MH (or something else?)
1043 }
1044 }
1045 if (format == ETF_DIRECT_HANDLE) {
1046 oop target = mh();
1047 for (;;) {
1048 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
1049 return target;
1050 }
1051 if (!java_lang_invoke_MethodHandle::is_instance(target)){
1052 return NULL; // unformed MH
1053 }
1054 target = java_lang_invoke_MethodHandle::vmtarget(target);
1055 }
1056 }
1057 // cases of metadata in MH.vmtarget:
1058 // - AMH can have methodOop for static invoke with bound receiver
1059 // - DMH can have methodOop for static invoke (on variable receiver)
1060 // - DMH can have klassOop for dispatched (non-static) invoke
1061 KlassHandle receiver_limit; int decode_flags = 0;
1062 methodHandle m = decode_MethodHandle(mh(), receiver_limit, decode_flags);
1063 if (m.is_null()) return NULL;
1064 switch (format) {
1065 case ETF_REFLECT_METHOD:
1066 // same as jni_ToReflectedMethod:
1067 if (m->is_initializer()) {
1068 return Reflection::new_constructor(m, THREAD);
1069 } else {
1070 return Reflection::new_method(m, UseNewReflection, false, THREAD);
1071 }
1073 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle
1074 case ETF_METHOD_NAME:
1075 {
1076 if (SystemDictionary::MemberName_klass() == NULL) break;
1077 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass());
1078 mname_klass->initialize(CHECK_NULL);
1079 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); // possible safepoint
1080 java_lang_invoke_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED);
1081 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
1082 init_MemberName(mname(), m(), do_dispatch);
1083 expand_MemberName(mname, 0, CHECK_NULL);
1084 return mname();
1085 }
1086 }
1088 // Unknown format code.
1089 char msg[50];
1090 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format);
1091 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg);
1092 }
1094 static const char* always_null_names[] = {
1095 "java/lang/Void",
1096 "java/lang/Null",
1097 //"java/lang/Nothing",
1098 "sun/dyn/empty/Empty",
1099 "sun/invoke/empty/Empty",
1100 NULL
1101 };
1103 static bool is_always_null_type(klassOop klass) {
1104 if (klass == NULL) return false; // safety
1105 if (!Klass::cast(klass)->oop_is_instance()) return false;
1106 instanceKlass* ik = instanceKlass::cast(klass);
1107 // Must be on the boot class path:
1108 if (ik->class_loader() != NULL) return false;
1109 // Check the name.
1110 Symbol* name = ik->name();
1111 for (int i = 0; ; i++) {
1112 const char* test_name = always_null_names[i];
1113 if (test_name == NULL) break;
1114 if (name->equals(test_name))
1115 return true;
1116 }
1117 return false;
1118 }
1120 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) {
1121 if (dst == NULL) return true;
1122 if (src == NULL) return (dst != SystemDictionary::Object_klass());
1123 if (src == dst || dst == SystemDictionary::Object_klass())
1124 return false; // quickest checks
1125 Klass* srck = Klass::cast(src);
1126 Klass* dstk = Klass::cast(dst);
1127 if (dstk->is_interface()) {
1128 // interface receivers can safely be viewed as untyped,
1129 // because interface calls always include a dynamic check
1130 //dstk = Klass::cast(SystemDictionary::Object_klass());
1131 return false;
1132 }
1133 if (srck->is_interface()) {
1134 // interface arguments must be viewed as untyped
1135 //srck = Klass::cast(SystemDictionary::Object_klass());
1136 return true;
1137 }
1138 if (is_always_null_type(src)) {
1139 // some source types are known to be never instantiated;
1140 // they represent references which are always null
1141 // such null references never fail to convert safely
1142 return false;
1143 }
1144 return !srck->is_subclass_of(dstk->as_klassOop());
1145 }
1147 static oop object_java_mirror() {
1148 return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
1149 }
1151 bool MethodHandles::is_float_fixed_reinterpretation_cast(BasicType src, BasicType dst) {
1152 if (src == T_FLOAT) return dst == T_INT;
1153 if (src == T_INT) return dst == T_FLOAT;
1154 if (src == T_DOUBLE) return dst == T_LONG;
1155 if (src == T_LONG) return dst == T_DOUBLE;
1156 return false;
1157 }
1159 bool MethodHandles::same_basic_type_for_arguments(BasicType src,
1160 BasicType dst,
1161 bool raw,
1162 bool for_return) {
1163 if (for_return) {
1164 // return values can always be forgotten:
1165 if (dst == T_VOID) return true;
1166 if (src == T_VOID) return raw && (dst == T_INT);
1167 // We allow caller to receive a garbage int, which is harmless.
1168 // This trick is pulled by trusted code (see VerifyType.canPassRaw).
1169 }
1170 assert(src != T_VOID && dst != T_VOID, "should not be here");
1171 if (src == dst) return true;
1172 if (type2size[src] != type2size[dst]) return false;
1173 if (src == T_OBJECT || dst == T_OBJECT) return false;
1174 if (raw) return true; // bitwise reinterpretation; caller guarantees safety
1175 // allow reinterpretation casts for integral widening
1176 if (is_subword_type(src)) { // subwords can fit in int or other subwords
1177 if (dst == T_INT) // any subword fits in an int
1178 return true;
1179 if (src == T_BOOLEAN) // boolean fits in any subword
1180 return is_subword_type(dst);
1181 if (src == T_BYTE && dst == T_SHORT)
1182 return true; // remaining case: byte fits in short
1183 }
1184 // allow float/fixed reinterpretation casts
1185 if (is_float_fixed_reinterpretation_cast(src, dst))
1186 return true;
1187 return false;
1188 }
1190 const char* MethodHandles::check_method_receiver(methodOop m,
1191 klassOop passed_recv_type) {
1192 assert(!m->is_static(), "caller resp.");
1193 if (passed_recv_type == NULL)
1194 return "receiver type is primitive";
1195 if (class_cast_needed(passed_recv_type, m->method_holder())) {
1196 Klass* formal = Klass::cast(m->method_holder());
1197 return SharedRuntime::generate_class_cast_message("receiver type",
1198 formal->external_name());
1199 }
1200 return NULL; // checks passed
1201 }
1203 // Verify that m's signature can be called type-safely by a method handle
1204 // of the given method type 'mtype'.
1205 // It takes a TRAPS argument because it must perform symbol lookups.
1206 void MethodHandles::verify_method_signature(methodHandle m,
1207 Handle mtype,
1208 int first_ptype_pos,
1209 KlassHandle insert_ptype,
1210 TRAPS) {
1211 Handle mhi_type;
1212 if (m->is_method_handle_invoke()) {
1213 // use this more exact typing instead of the symbolic signature:
1214 mhi_type = Handle(THREAD, m->method_handle_type());
1215 }
1216 objArrayHandle ptypes(THREAD, java_lang_invoke_MethodType::ptypes(mtype()));
1217 int pnum = first_ptype_pos;
1218 int pmax = ptypes->length();
1219 int anum = 0; // method argument
1220 const char* err = NULL;
1221 ResourceMark rm(THREAD);
1222 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
1223 oop ptype_oop = NULL;
1224 if (ss.at_return_type()) {
1225 if (pnum != pmax)
1226 { err = "too many arguments"; break; }
1227 ptype_oop = java_lang_invoke_MethodType::rtype(mtype());
1228 } else {
1229 if (pnum >= pmax)
1230 { err = "not enough arguments"; break; }
1231 if (pnum >= 0)
1232 ptype_oop = ptypes->obj_at(pnum);
1233 else if (insert_ptype.is_null())
1234 ptype_oop = NULL;
1235 else
1236 ptype_oop = insert_ptype->java_mirror();
1237 pnum += 1;
1238 anum += 1;
1239 }
1240 KlassHandle pklass;
1241 BasicType ptype = T_OBJECT;
1242 bool have_ptype = false;
1243 // missing ptype_oop does not match any non-reference; use Object to report the error
1244 pklass = SystemDictionaryHandles::Object_klass();
1245 if (ptype_oop != NULL) {
1246 have_ptype = true;
1247 klassOop pklass_oop = NULL;
1248 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass_oop);
1249 pklass = KlassHandle(THREAD, pklass_oop);
1250 }
1251 ptype_oop = NULL; //done with this
1252 KlassHandle aklass;
1253 BasicType atype = ss.type();
1254 if (atype == T_ARRAY) atype = T_OBJECT; // fold all refs to T_OBJECT
1255 if (atype == T_OBJECT) {
1256 if (!have_ptype) {
1257 // null matches any reference
1258 continue;
1259 }
1260 if (mhi_type.is_null()) {
1261 // If we fail to resolve types at this point, we will usually throw an error.
1262 TempNewSymbol name = ss.as_symbol_or_null();
1263 if (name != NULL) {
1264 instanceKlass* mk = instanceKlass::cast(m->method_holder());
1265 Handle loader(THREAD, mk->class_loader());
1266 Handle domain(THREAD, mk->protection_domain());
1267 klassOop aklass_oop = SystemDictionary::resolve_or_null(name, loader, domain, CHECK);
1268 if (aklass_oop != NULL)
1269 aklass = KlassHandle(THREAD, aklass_oop);
1270 if (aklass.is_null() &&
1271 pklass.not_null() &&
1272 loader.is_null() &&
1273 pklass->name() == name)
1274 // accept name equivalence here, since that's the best we can do
1275 aklass = pklass;
1276 }
1277 } else {
1278 // for method handle invokers we don't look at the name in the signature
1279 oop atype_oop;
1280 if (ss.at_return_type())
1281 atype_oop = java_lang_invoke_MethodType::rtype(mhi_type());
1282 else
1283 atype_oop = java_lang_invoke_MethodType::ptype(mhi_type(), anum-1);
1284 klassOop aklass_oop = NULL;
1285 atype = java_lang_Class::as_BasicType(atype_oop, &aklass_oop);
1286 aklass = KlassHandle(THREAD, aklass_oop);
1287 }
1288 }
1289 if (!ss.at_return_type()) {
1290 err = check_argument_type_change(ptype, pklass(), atype, aklass(), anum);
1291 } else {
1292 err = check_return_type_change(atype, aklass(), ptype, pklass()); // note reversal!
1293 }
1294 if (err != NULL) break;
1295 }
1297 if (err != NULL) {
1298 #ifndef PRODUCT
1299 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1300 tty->print("*** verify_method_signature failed: ");
1301 java_lang_invoke_MethodType::print_signature(mtype(), tty);
1302 tty->cr();
1303 tty->print_cr(" first_ptype_pos = %d, insert_ptype = "UINTX_FORMAT, first_ptype_pos, insert_ptype());
1304 tty->print(" Failing method: ");
1305 m->print();
1306 }
1307 #endif //PRODUCT
1308 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1309 }
1310 }
1312 // Main routine for verifying the MethodHandle.type of a proposed
1313 // direct or bound-direct method handle.
1314 void MethodHandles::verify_method_type(methodHandle m,
1315 Handle mtype,
1316 bool has_bound_recv,
1317 KlassHandle bound_recv_type,
1318 TRAPS) {
1319 bool m_needs_receiver = !m->is_static();
1321 const char* err = NULL;
1323 int first_ptype_pos = m_needs_receiver ? 1 : 0;
1324 if (has_bound_recv) {
1325 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them
1326 if (m_needs_receiver && bound_recv_type.is_null())
1327 { err = "bound receiver is not an object"; goto die; }
1328 }
1330 if (m_needs_receiver && err == NULL) {
1331 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype());
1332 if (ptypes->length() < first_ptype_pos)
1333 { err = "receiver argument is missing"; goto die; }
1334 if (has_bound_recv)
1335 err = check_method_receiver(m(), bound_recv_type->as_klassOop());
1336 else
1337 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1)));
1338 if (err != NULL) goto die;
1339 }
1341 // Check the other arguments for mistypes.
1342 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK);
1343 return;
1345 die:
1346 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1347 }
1349 void MethodHandles::verify_vmslots(Handle mh, TRAPS) {
1350 // Verify vmslots.
1351 int check_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(mh()));
1352 if (java_lang_invoke_MethodHandle::vmslots(mh()) != check_slots) {
1353 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH");
1354 }
1355 }
1357 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) {
1358 // Verify that argslot points at the given argnum.
1359 int check_slot = argument_slot(java_lang_invoke_MethodHandle::type(mh()), argnum);
1360 if (argslot != check_slot || argslot < 0) {
1361 ResourceMark rm;
1362 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d";
1363 size_t msglen = strlen(fmt) + 3*11 + 1;
1364 char* msg = NEW_RESOURCE_ARRAY(char, msglen);
1365 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot);
1366 THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
1367 }
1368 }
1370 // Verify the correspondence between two method types.
1371 // Apart from the advertised changes, caller method type X must
1372 // be able to invoke the callee method Y type with no violations
1373 // of type integrity.
1374 // Return NULL if all is well, else a short error message.
1375 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end,
1376 int insert_argnum, oop insert_type,
1377 int change_argnum, oop change_type,
1378 int delete_argnum,
1379 oop dst_mtype, int dst_beg, int dst_end,
1380 bool raw) {
1381 objArrayOop src_ptypes = java_lang_invoke_MethodType::ptypes(src_mtype);
1382 objArrayOop dst_ptypes = java_lang_invoke_MethodType::ptypes(dst_mtype);
1384 int src_max = src_ptypes->length();
1385 int dst_max = dst_ptypes->length();
1387 if (src_end == -1) src_end = src_max;
1388 if (dst_end == -1) dst_end = dst_max;
1390 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob");
1391 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob");
1393 // pending actions; set to -1 when done:
1394 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum;
1396 const char* err = NULL;
1398 // Walk along each array of parameter types, including a virtual
1399 // NULL end marker at the end of each.
1400 for (int src_idx = src_beg, dst_idx = dst_beg;
1401 (src_idx <= src_end && dst_idx <= dst_end);
1402 src_idx++, dst_idx++) {
1403 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx);
1404 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx);
1405 bool fix_null_src_type = false;
1407 // Perform requested edits.
1408 if (ins_idx == src_idx) {
1409 // note that the inserted guy is never affected by a change or deletion
1410 ins_idx = -1;
1411 src_type = insert_type;
1412 fix_null_src_type = true;
1413 --src_idx; // back up to process src type on next loop
1414 src_idx = src_end;
1415 } else {
1416 // note that the changed guy can be immediately deleted
1417 if (chg_idx == src_idx) {
1418 chg_idx = -1;
1419 assert(src_idx < src_end, "oob");
1420 src_type = change_type;
1421 fix_null_src_type = true;
1422 }
1423 if (del_idx == src_idx) {
1424 del_idx = -1;
1425 assert(src_idx < src_end, "oob");
1426 --dst_idx;
1427 continue; // rerun loop after skipping this position
1428 }
1429 }
1431 if (src_type == NULL && fix_null_src_type)
1432 // explicit null in this case matches any dest reference
1433 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type);
1435 // Compare the two argument types.
1436 if (src_type != dst_type) {
1437 if (src_type == NULL) return "not enough arguments";
1438 if (dst_type == NULL) return "too many arguments";
1439 err = check_argument_type_change(src_type, dst_type, dst_idx, raw);
1440 if (err != NULL) return err;
1441 }
1442 }
1444 // Now compare return types also.
1445 oop src_rtype = java_lang_invoke_MethodType::rtype(src_mtype);
1446 oop dst_rtype = java_lang_invoke_MethodType::rtype(dst_mtype);
1447 if (src_rtype != dst_rtype) {
1448 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal!
1449 if (err != NULL) return err;
1450 }
1452 assert(err == NULL, "");
1453 return NULL; // all is well
1454 }
1457 const char* MethodHandles::check_argument_type_change(BasicType src_type,
1458 klassOop src_klass,
1459 BasicType dst_type,
1460 klassOop dst_klass,
1461 int argnum,
1462 bool raw) {
1463 const char* err = NULL;
1464 const bool for_return = (argnum < 0);
1466 // just in case:
1467 if (src_type == T_ARRAY) src_type = T_OBJECT;
1468 if (dst_type == T_ARRAY) dst_type = T_OBJECT;
1470 // Produce some nice messages if VerifyMethodHandles is turned on:
1471 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) {
1472 if (src_type == T_OBJECT) {
1473 if (raw && is_java_primitive(dst_type))
1474 return NULL; // ref-to-prim discards ref and returns zero
1475 err = (!for_return
1476 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s"
1477 : "type mismatch: returning a %s, but caller expects primitive %s");
1478 } else if (dst_type == T_OBJECT) {
1479 err = (!for_return
1480 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s"
1481 : "type mismatch: returning a primitive %s, but caller expects %s");
1482 } else {
1483 err = (!for_return
1484 ? "type mismatch: passing a %s for method argument #%d, which expects %s"
1485 : "type mismatch: returning a %s, but caller expects %s");
1486 }
1487 } else if (src_type == T_OBJECT && dst_type == T_OBJECT &&
1488 class_cast_needed(src_klass, dst_klass)) {
1489 if (!class_cast_needed(dst_klass, src_klass)) {
1490 if (raw)
1491 return NULL; // reverse cast is OK; the MH target is trusted to enforce it
1492 err = (!for_return
1493 ? "cast required: passing a %s for method argument #%d, which expects %s"
1494 : "cast required: returning a %s, but caller expects %s");
1495 } else {
1496 err = (!for_return
1497 ? "reference mismatch: passing a %s for method argument #%d, which expects %s"
1498 : "reference mismatch: returning a %s, but caller expects %s");
1499 }
1500 } else {
1501 // passed the obstacle course
1502 return NULL;
1503 }
1505 // format, format, format
1506 const char* src_name = type2name(src_type);
1507 const char* dst_name = type2name(dst_type);
1508 if (src_name == NULL) src_name = "unknown type";
1509 if (dst_name == NULL) dst_name = "unknown type";
1510 if (src_type == T_OBJECT)
1511 src_name = (src_klass != NULL) ? Klass::cast(src_klass)->external_name() : "an unresolved class";
1512 if (dst_type == T_OBJECT)
1513 dst_name = (dst_klass != NULL) ? Klass::cast(dst_klass)->external_name() : "an unresolved class";
1515 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11);
1516 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1);
1517 if (!for_return) {
1518 assert(strstr(err, "%d") != NULL, "");
1519 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name);
1520 } else {
1521 assert(strstr(err, "%d") == NULL, "");
1522 jio_snprintf(msg, msglen, err, src_name, dst_name);
1523 }
1524 return msg;
1525 }
1527 // Compute the depth within the stack of the given argument, i.e.,
1528 // the combined size of arguments to the right of the given argument.
1529 // For the last argument (ptypes.length-1) this will be zero.
1530 // For the first argument (0) this will be the size of all
1531 // arguments but that one. For the special number -1, this
1532 // will be the size of all arguments, including the first.
1533 // If the argument is neither -1 nor a valid argument index,
1534 // then return a negative number. Otherwise, the result
1535 // is in the range [0..vmslots] inclusive.
1536 int MethodHandles::argument_slot(oop method_type, int arg) {
1537 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type);
1538 int argslot = 0;
1539 int len = ptypes->length();
1540 if (arg < -1 || arg >= len) return -99;
1541 for (int i = len-1; i > arg; i--) {
1542 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1543 argslot += type2size[bt];
1544 }
1545 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works");
1546 return argslot;
1547 }
1549 // Given a slot number, return the argument number.
1550 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) {
1551 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type);
1552 int argslot = 0;
1553 int len = ptypes->length();
1554 for (int i = len-1; i >= 0; i--) {
1555 if (query_argslot == argslot) return i;
1556 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1557 argslot += type2size[bt];
1558 }
1559 // return pseudo-arg deepest in stack:
1560 if (query_argslot == argslot) return -1;
1561 return -99; // oob slot, or splitting a double-slot arg
1562 }
1564 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m,
1565 KlassHandle receiver_limit,
1566 int decode_flags,
1567 KlassHandle receiver_klass,
1568 TRAPS) {
1569 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference");
1570 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument");
1572 if (!m->is_static() &&
1573 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder())))
1574 // given type does not match class of method, or receiver is null!
1575 // caller should have checked this, but let's be extra careful...
1576 return methodHandle();
1578 if (receiver_limit.not_null() &&
1579 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit())))
1580 // given type is not limited to the receiver type
1581 // note that a null receiver can match any reference value, for a static method
1582 return methodHandle();
1584 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) {
1585 // pre-dispatched or static method (null receiver is OK for static)
1586 return m;
1588 } else if (receiver_klass.is_null()) {
1589 // null receiver value; cannot dispatch
1590 return methodHandle();
1592 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) {
1593 // perform virtual dispatch
1594 int vtable_index = m->vtable_index();
1595 guarantee(vtable_index >= 0, "valid vtable index");
1597 // receiver_klass might be an arrayKlassOop but all vtables start at
1598 // the same place. The cast is to avoid virtual call and assertion.
1599 // See also LinkResolver::runtime_resolve_virtual_method.
1600 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass());
1601 DEBUG_ONLY(inst->verify_vtable_index(vtable_index));
1602 methodOop m_oop = inst->method_at_vtable(vtable_index);
1603 return methodHandle(THREAD, m_oop);
1605 } else {
1606 // perform interface dispatch
1607 int itable_index = klassItable::compute_itable_index(m());
1608 guarantee(itable_index >= 0, "valid itable index");
1609 instanceKlass* inst = instanceKlass::cast(receiver_klass());
1610 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD);
1611 return methodHandle(THREAD, m_oop);
1612 }
1613 }
1615 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) {
1616 // Verify type.
1617 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1618 verify_method_type(m, mtype, false, KlassHandle(), CHECK);
1620 // Verify vmslots.
1621 if (java_lang_invoke_MethodHandle::vmslots(mh()) != m->size_of_parameters()) {
1622 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH");
1623 }
1624 }
1626 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) {
1627 // Check arguments.
1628 if (mh.is_null() || m.is_null() ||
1629 (!do_dispatch && m->is_abstract())) {
1630 THROW(vmSymbols::java_lang_InternalError());
1631 }
1633 java_lang_invoke_MethodHandle::init_vmslots(mh());
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 java_lang_invoke_MethodHandle::init_vmslots(mh());
1758 int vmargslot = m->size_of_parameters() - 1;
1759 assert(java_lang_invoke_BoundMethodHandle::vmargslot(mh()) == vmargslot, "");
1761 if (VerifyMethodHandles) {
1762 verify_BoundMethodHandle_with_receiver(mh, m, CHECK);
1763 }
1765 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m());
1767 DEBUG_ONLY(KlassHandle junk1; int junk2);
1768 assert(MethodHandles::decode_method(mh(), junk1, junk2) == m, "properly stored for later decoding");
1769 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot");
1771 // Done!
1772 java_lang_invoke_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh));
1773 }
1775 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
1776 bool direct_to_method, TRAPS) {
1777 ResourceMark rm;
1778 Handle ptype_handle(THREAD,
1779 java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum));
1780 KlassHandle ptype_klass;
1781 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass);
1782 int slots_pushed = type2size[ptype];
1784 oop argument = java_lang_invoke_BoundMethodHandle::argument(mh());
1786 const char* err = NULL;
1788 switch (ptype) {
1789 case T_OBJECT:
1790 if (argument != NULL)
1791 // we must implicitly convert from the arg type to the outgoing ptype
1792 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum);
1793 break;
1795 case T_ARRAY: case T_VOID:
1796 assert(false, "array, void do not appear here");
1797 default:
1798 if (ptype != T_INT && !is_subword_type(ptype)) {
1799 err = "unexpected parameter type";
1800 break;
1801 }
1802 // check subrange of Integer.value, if necessary
1803 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) {
1804 err = "bound integer argument must be of type java.lang.Integer";
1805 break;
1806 }
1807 if (ptype != T_INT) {
1808 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
1809 jint value = argument->int_field(value_offset);
1810 int vminfo = adapter_unbox_subword_vminfo(ptype);
1811 jint subword = truncate_subword_from_vminfo(value, vminfo);
1812 if (value != subword) {
1813 err = "bound subword value does not fit into the subword type";
1814 break;
1815 }
1816 }
1817 break;
1818 case T_FLOAT:
1819 case T_DOUBLE:
1820 case T_LONG:
1821 {
1822 // we must implicitly convert from the unboxed arg type to the outgoing ptype
1823 BasicType argbox = java_lang_boxing_object::basic_type(argument);
1824 if (argbox != ptype) {
1825 err = check_argument_type_change(T_OBJECT, (argument == NULL
1826 ? SystemDictionary::Object_klass()
1827 : argument->klass()),
1828 ptype, ptype_klass(), argnum);
1829 assert(err != NULL, "this must be an error");
1830 }
1831 break;
1832 }
1833 }
1835 if (err == NULL) {
1836 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1837 if (direct_to_method) {
1838 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots");
1839 } else {
1840 int target_pushes = decode_MethodHandle_stack_pushes(target());
1841 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct");
1842 }
1843 }
1845 if (err == NULL) {
1846 // Verify the rest of the method type.
1847 err = check_method_type_insertion(java_lang_invoke_MethodHandle::type(mh()),
1848 argnum, ptype_handle(),
1849 java_lang_invoke_MethodHandle::type(target()));
1850 }
1852 if (err != NULL) {
1853 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1854 }
1855 }
1857 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
1858 // Check arguments.
1859 if (mh.is_null() || target.is_null() || !java_lang_invoke_MethodHandle::is_instance(target())) {
1860 THROW(vmSymbols::java_lang_InternalError());
1861 }
1863 java_lang_invoke_MethodHandle::init_vmslots(mh());
1864 int argslot = java_lang_invoke_BoundMethodHandle::vmargslot(mh());
1866 if (VerifyMethodHandles) {
1867 int insert_after = argnum - 1;
1868 verify_vmargslot(mh, insert_after, argslot, CHECK);
1869 verify_vmslots(mh, CHECK);
1870 }
1872 // Get bound type and required slots.
1873 BasicType ptype;
1874 {
1875 oop ptype_oop = java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum);
1876 ptype = java_lang_Class::as_BasicType(ptype_oop);
1877 }
1878 int slots_pushed = type2size[ptype];
1880 // If (a) the target is a direct non-dispatched method handle,
1881 // or (b) the target is a dispatched direct method handle and we
1882 // are binding the receiver, cut out the middle-man.
1883 // Do this by decoding the DMH and using its methodOop directly as vmtarget.
1884 bool direct_to_method = false;
1885 if (OptimizeMethodHandles &&
1886 target->klass() == SystemDictionary::DirectMethodHandle_klass() &&
1887 (argnum != 0 || java_lang_invoke_BoundMethodHandle::argument(mh()) != NULL) &&
1888 (argnum == 0 || java_lang_invoke_DirectMethodHandle::vmindex(target()) < 0)) {
1889 KlassHandle receiver_limit; int decode_flags = 0;
1890 methodHandle m = decode_method(target(), receiver_limit, decode_flags);
1891 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); }
1892 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg.
1893 assert(java_lang_invoke_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig");
1894 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) {
1895 init_BoundMethodHandle_with_receiver(mh, m,
1896 receiver_limit, decode_flags,
1897 CHECK);
1898 return;
1899 }
1901 // Even if it is not a bound receiver, we still might be able
1902 // to bind another argument and still invoke the methodOop directly.
1903 if (!(decode_flags & _dmf_does_dispatch)) {
1904 direct_to_method = true;
1905 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m());
1906 }
1907 }
1908 if (!direct_to_method)
1909 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), target());
1911 if (VerifyMethodHandles) {
1912 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK);
1913 }
1915 // Next question: Is this a ref, int, or long bound value?
1916 MethodHandleEntry* me = NULL;
1917 if (ptype == T_OBJECT) {
1918 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh);
1919 else me = MethodHandles::entry(_bound_ref_mh);
1920 } else if (slots_pushed == 2) {
1921 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh);
1922 else me = MethodHandles::entry(_bound_long_mh);
1923 } else if (slots_pushed == 1) {
1924 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh);
1925 else me = MethodHandles::entry(_bound_int_mh);
1926 } else {
1927 assert(false, "");
1928 }
1930 // Done!
1931 java_lang_invoke_MethodHandle::set_vmentry(mh(), me);
1932 }
1934 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) {
1935 char msg[200];
1936 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err);
1937 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg);
1938 }
1940 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) {
1941 ResourceMark rm;
1942 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
1943 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
1945 verify_vmargslot(mh, argnum, argslot, CHECK);
1946 verify_vmslots(mh, CHECK);
1948 jint conv_op = adapter_conversion_op(conversion);
1949 if (!conv_op_valid(conv_op)) {
1950 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD);
1951 return;
1952 }
1953 EntryKind ek = adapter_entry_kind(conv_op);
1955 int stack_move = adapter_conversion_stack_move(conversion);
1956 BasicType src = adapter_conversion_src_type(conversion);
1957 BasicType dest = adapter_conversion_dest_type(conversion);
1958 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
1960 Handle argument(THREAD, java_lang_invoke_AdapterMethodHandle::argument(mh()));
1961 Handle target(THREAD, java_lang_invoke_AdapterMethodHandle::vmtarget(mh()));
1962 Handle src_mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1963 Handle dst_mtype(THREAD, java_lang_invoke_MethodHandle::type(target()));
1964 Handle arg_mtype;
1966 const char* err = NULL;
1968 if (err == NULL) {
1969 // Check that the correct argument is supplied, but only if it is required.
1970 switch (ek) {
1971 case _adapter_check_cast: // target type of cast
1972 case _adapter_ref_to_prim: // wrapper type from which to unbox
1973 case _adapter_spread_args: // array type to spread from
1974 if (!java_lang_Class::is_instance(argument())
1975 || java_lang_Class::is_primitive(argument()))
1976 { err = "adapter requires argument of type java.lang.Class"; break; }
1977 if (ek == _adapter_spread_args) {
1978 // Make sure it is a suitable collection type. (Array, for now.)
1979 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument()));
1980 if (!ak->oop_is_array())
1981 { err = "spread adapter requires argument representing an array class"; break; }
1982 BasicType et = arrayKlass::cast(ak->as_klassOop())->element_type();
1983 if (et != dest && stack_move <= 0)
1984 { err = "spread adapter requires array class argument of correct type"; break; }
1985 }
1986 break;
1987 case _adapter_prim_to_ref: // boxer MH to use
1988 case _adapter_collect_args: // method handle which collects the args
1989 case _adapter_fold_args: // method handle which collects the args
1990 if (!UseRicochetFrames) {
1991 { err = "box/collect/fold operators are not supported"; break; }
1992 }
1993 if (!java_lang_invoke_MethodHandle::is_instance(argument()))
1994 { err = "MethodHandle adapter argument required"; break; }
1995 arg_mtype = Handle(THREAD, java_lang_invoke_MethodHandle::type(argument()));
1996 break;
1997 default:
1998 if (argument.not_null())
1999 { err = "adapter has spurious argument"; break; }
2000 break;
2001 }
2002 }
2004 if (err == NULL) {
2005 // Check that the src/dest types are supplied if needed.
2006 // Also check relevant parameter or return types.
2007 switch (ek) {
2008 case _adapter_check_cast:
2009 if (src != T_OBJECT || dest != T_OBJECT) {
2010 err = "adapter requires object src/dest conversion subfields";
2011 }
2012 break;
2013 case _adapter_prim_to_prim:
2014 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) {
2015 err = "adapter requires primitive src/dest conversion subfields"; break;
2016 }
2017 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) ||
2018 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) {
2019 err = "adapter cannot convert beween floating and fixed-point"; break;
2020 }
2021 break;
2022 case _adapter_ref_to_prim:
2023 if (src != T_OBJECT || !is_java_primitive(dest)
2024 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) {
2025 err = "adapter requires primitive dest conversion subfield"; break;
2026 }
2027 break;
2028 case _adapter_prim_to_ref:
2029 if (!is_java_primitive(src) || dest != T_OBJECT) {
2030 err = "adapter requires primitive src conversion subfield"; break;
2031 }
2032 break;
2033 case _adapter_swap_args:
2034 {
2035 if (!src || !dest) {
2036 err = "adapter requires src/dest conversion subfields for swap"; break;
2037 }
2038 int src_size = type2size[src];
2039 if (src_size != type2size[dest]) {
2040 err = "adapter requires equal sizes for src/dest"; break;
2041 }
2042 int src_slot = argslot;
2043 int dest_slot = vminfo;
2044 int src_arg = argnum;
2045 int dest_arg = argument_slot_to_argnum(src_mtype(), dest_slot);
2046 verify_vmargslot(mh, dest_arg, dest_slot, CHECK);
2047 if (!(dest_slot >= src_slot + src_size) &&
2048 !(src_slot >= dest_slot + src_size)) {
2049 err = "source, destination slots must be distinct"; break;
2050 } else if (!(src_slot > dest_slot)) {
2051 err = "source of swap must be deeper in stack"; break;
2052 }
2053 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), dest_arg),
2054 java_lang_invoke_MethodType::ptype(dst_mtype(), src_arg),
2055 dest_arg);
2056 if (err == NULL)
2057 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), src_arg),
2058 java_lang_invoke_MethodType::ptype(dst_mtype(), dest_arg),
2059 src_arg);
2060 break;
2061 }
2062 case _adapter_rot_args:
2063 {
2064 if (!src || !dest) {
2065 err = "adapter requires src/dest conversion subfields for rotate"; break;
2066 }
2067 int src_slot = argslot;
2068 int limit_raw = vminfo;
2069 bool rot_down = (src_slot < limit_raw);
2070 int limit_bias = (rot_down ? MethodHandles::OP_ROT_ARGS_DOWN_LIMIT_BIAS : 0);
2071 int limit_slot = limit_raw - limit_bias;
2072 int src_arg = argnum;
2073 int limit_arg = argument_slot_to_argnum(src_mtype(), limit_slot);
2074 verify_vmargslot(mh, limit_arg, limit_slot, CHECK);
2075 if (src_slot == limit_slot) {
2076 err = "source, destination slots must be distinct"; break;
2077 }
2078 if (!rot_down) { // rotate slots up == shift arguments left
2079 // limit_slot is an inclusive lower limit
2080 assert((src_slot > limit_slot) && (src_arg < limit_arg), "");
2081 // rotate up: [limit_slot..src_slot-ss] --> [limit_slot+ss..src_slot]
2082 // that is: [src_arg+1..limit_arg] --> [src_arg..limit_arg-1]
2083 for (int i = src_arg+1; i <= limit_arg && err == NULL; i++) {
2084 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), i),
2085 java_lang_invoke_MethodType::ptype(dst_mtype(), i-1),
2086 i);
2087 }
2088 } else { // rotate slots down == shfit arguments right
2089 // limit_slot is an exclusive upper limit
2090 assert((src_slot < limit_slot - limit_bias) && (src_arg > limit_arg + limit_bias), "");
2091 // rotate down: [src_slot+ss..limit_slot) --> [src_slot..limit_slot-ss)
2092 // that is: (limit_arg..src_arg-1] --> (dst_arg+1..src_arg]
2093 for (int i = limit_arg+1; i <= src_arg-1 && err == NULL; i++) {
2094 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), i),
2095 java_lang_invoke_MethodType::ptype(dst_mtype(), i+1),
2096 i);
2097 }
2098 }
2099 if (err == NULL) {
2100 int dest_arg = (rot_down ? limit_arg+1 : limit_arg);
2101 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), src_arg),
2102 java_lang_invoke_MethodType::ptype(dst_mtype(), dest_arg),
2103 src_arg);
2104 }
2105 }
2106 break;
2107 case _adapter_spread_args:
2108 case _adapter_collect_args:
2109 case _adapter_fold_args:
2110 {
2111 bool is_spread = (ek == _adapter_spread_args);
2112 bool is_fold = (ek == _adapter_fold_args);
2113 BasicType coll_type = is_spread ? src : dest;
2114 BasicType elem_type = is_spread ? dest : src;
2115 // coll_type is type of args in collected form (or T_VOID if none)
2116 // elem_type is common type of args in spread form (or T_VOID if missing or heterogeneous)
2117 if (coll_type == 0 || elem_type == 0) {
2118 err = "adapter requires src/dest subfields for spread or collect"; break;
2119 }
2120 if (is_spread && coll_type != T_OBJECT) {
2121 err = "spread adapter requires object type for argument bundle"; break;
2122 }
2123 Handle spread_mtype = (is_spread ? dst_mtype : src_mtype);
2124 int spread_slot = argslot;
2125 int spread_arg = argnum;
2126 int slots_pushed = stack_move / stack_move_unit();
2127 int coll_slot_count = type2size[coll_type];
2128 int spread_slot_count = (is_spread ? slots_pushed : -slots_pushed) + coll_slot_count;
2129 if (is_fold) spread_slot_count = argument_slot_count(arg_mtype());
2130 if (!is_spread) {
2131 int init_slots = argument_slot_count(src_mtype());
2132 int coll_slots = argument_slot_count(arg_mtype());
2133 if (spread_slot_count > init_slots ||
2134 spread_slot_count != coll_slots) {
2135 err = "collect adapter has inconsistent arg counts"; break;
2136 }
2137 int next_slots = argument_slot_count(dst_mtype());
2138 int unchanged_slots_in = (init_slots - spread_slot_count);
2139 int unchanged_slots_out = (next_slots - coll_slot_count - (is_fold ? spread_slot_count : 0));
2140 if (unchanged_slots_in != unchanged_slots_out) {
2141 err = "collect adapter continuation has inconsistent arg counts"; break;
2142 }
2143 }
2144 }
2145 break;
2146 default:
2147 if (src != 0 || dest != 0) {
2148 err = "adapter has spurious src/dest conversion subfields"; break;
2149 }
2150 break;
2151 }
2152 }
2154 if (err == NULL) {
2155 // Check the stack_move subfield.
2156 // It must always report the net change in stack size, positive or negative.
2157 int slots_pushed = stack_move / stack_move_unit();
2158 switch (ek) {
2159 case _adapter_prim_to_prim:
2160 case _adapter_ref_to_prim:
2161 case _adapter_prim_to_ref:
2162 if (slots_pushed != type2size[dest] - type2size[src]) {
2163 err = "wrong stack motion for primitive conversion";
2164 }
2165 break;
2166 case _adapter_dup_args:
2167 if (slots_pushed <= 0) {
2168 err = "adapter requires conversion subfield slots_pushed > 0";
2169 }
2170 break;
2171 case _adapter_drop_args:
2172 if (slots_pushed >= 0) {
2173 err = "adapter requires conversion subfield slots_pushed < 0";
2174 }
2175 break;
2176 case _adapter_collect_args:
2177 case _adapter_fold_args:
2178 if (slots_pushed > 2) {
2179 err = "adapter requires conversion subfield slots_pushed <= 2";
2180 }
2181 break;
2182 case _adapter_spread_args:
2183 if (slots_pushed < -1) {
2184 err = "adapter requires conversion subfield slots_pushed >= -1";
2185 }
2186 break;
2187 default:
2188 if (stack_move != 0) {
2189 err = "adapter has spurious stack_move conversion subfield";
2190 }
2191 break;
2192 }
2193 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) {
2194 err = "stack_move conversion subfield must be multiple of stack_move_unit";
2195 }
2196 }
2198 if (err == NULL) {
2199 // Make sure this adapter's stack pushing is accurately recorded.
2200 int slots_pushed = stack_move / stack_move_unit();
2201 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh());
2202 int target_vmslots = java_lang_invoke_MethodHandle::vmslots(target());
2203 int target_pushes = decode_MethodHandle_stack_pushes(target());
2204 if (slots_pushed != (target_vmslots - this_vmslots)) {
2205 err = "stack_move inconsistent with previous and current MethodType vmslots";
2206 } else {
2207 int this_pushes = decode_MethodHandle_stack_pushes(mh());
2208 if (slots_pushed + target_pushes != this_pushes) {
2209 if (this_pushes == 0)
2210 err = "adapter push count not initialized";
2211 else
2212 err = "adapter push count is wrong";
2213 }
2214 }
2216 // While we're at it, check that the stack motion decoder works:
2217 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
2218 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct");
2219 }
2221 if (err == NULL && vminfo != 0) {
2222 switch (ek) {
2223 case _adapter_swap_args:
2224 case _adapter_rot_args:
2225 case _adapter_prim_to_ref:
2226 case _adapter_collect_args:
2227 case _adapter_fold_args:
2228 break; // OK
2229 default:
2230 err = "vminfo subfield is reserved to the JVM";
2231 }
2232 }
2234 // Do additional ad hoc checks.
2235 if (err == NULL) {
2236 switch (ek) {
2237 case _adapter_retype_only:
2238 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false);
2239 break;
2241 case _adapter_retype_raw:
2242 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true);
2243 break;
2245 case _adapter_check_cast:
2246 {
2247 // The actual value being checked must be a reference:
2248 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), argnum),
2249 object_java_mirror(), argnum);
2250 if (err != NULL) break;
2252 // The output of the cast must fit with the destination argument:
2253 Handle cast_class = argument;
2254 err = check_method_type_conversion(src_mtype(),
2255 argnum, cast_class(),
2256 dst_mtype());
2257 }
2258 break;
2260 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles
2261 }
2262 }
2264 if (err != NULL) {
2265 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
2266 return;
2267 }
2269 }
2271 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
2272 Handle argument = java_lang_invoke_AdapterMethodHandle::argument(mh());
2273 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
2274 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
2275 jint conv_op = adapter_conversion_op(conversion);
2277 // adjust the adapter code to the internal EntryKind enumeration:
2278 EntryKind ek_orig = adapter_entry_kind(conv_op);
2279 EntryKind ek_opt = ek_orig; // may be optimized
2280 EntryKind ek_try; // temp
2282 // Finalize the vmtarget field (Java initialized it to null).
2283 if (!java_lang_invoke_MethodHandle::is_instance(target())) {
2284 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD);
2285 return;
2286 }
2287 java_lang_invoke_AdapterMethodHandle::set_vmtarget(mh(), target());
2289 int stack_move = adapter_conversion_stack_move(conversion);
2290 BasicType src = adapter_conversion_src_type(conversion);
2291 BasicType dest = adapter_conversion_dest_type(conversion);
2292 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
2294 int slots_pushed = stack_move / stack_move_unit();
2296 if (VerifyMethodHandles) {
2297 verify_AdapterMethodHandle(mh, argnum, CHECK);
2298 }
2300 const char* err = NULL;
2302 if (!conv_op_supported(conv_op)) {
2303 err = "adapter not yet implemented in the JVM";
2304 }
2306 // Now it's time to finish the case analysis and pick a MethodHandleEntry.
2307 switch (ek_orig) {
2308 case _adapter_retype_only:
2309 case _adapter_retype_raw:
2310 case _adapter_check_cast:
2311 case _adapter_dup_args:
2312 case _adapter_drop_args:
2313 // these work fine via general case code
2314 break;
2316 case _adapter_prim_to_prim:
2317 {
2318 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}.
2319 // And, the {float,double} -> {int,long} cases must be handled by Java.
2320 switch (type2size[src] *4+ type2size[dest]) {
2321 case 1 *4+ 1:
2322 assert(src == T_INT || is_subword_type(src), "source is not float");
2323 // Subword-related cases are int -> {boolean,byte,char,short}.
2324 ek_opt = _adapter_opt_i2i;
2325 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2326 break;
2327 case 2 *4+ 1:
2328 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) {
2329 ek_opt = _adapter_opt_l2i;
2330 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2331 } else if (src == T_DOUBLE && dest == T_FLOAT) {
2332 ek_opt = _adapter_opt_d2f;
2333 } else {
2334 goto throw_not_impl; // runs user code, hence could block
2335 }
2336 break;
2337 case 1 *4+ 2:
2338 if ((src == T_INT || is_subword_type(src)) && dest == T_LONG) {
2339 ek_opt = _adapter_opt_i2l;
2340 } else if (src == T_FLOAT && dest == T_DOUBLE) {
2341 ek_opt = _adapter_opt_f2d;
2342 } else {
2343 goto throw_not_impl; // runs user code, hence could block
2344 }
2345 break;
2346 default:
2347 goto throw_not_impl; // runs user code, hence could block
2348 break;
2349 }
2350 }
2351 break;
2353 case _adapter_ref_to_prim:
2354 {
2355 switch (type2size[dest]) {
2356 case 1:
2357 ek_opt = _adapter_opt_unboxi;
2358 vminfo = adapter_unbox_subword_vminfo(dest);
2359 break;
2360 case 2:
2361 ek_opt = _adapter_opt_unboxl;
2362 break;
2363 default:
2364 goto throw_not_impl;
2365 break;
2366 }
2367 }
2368 break;
2370 case _adapter_prim_to_ref:
2371 {
2372 assert(UseRicochetFrames, "else don't come here");
2373 // vminfo will be the location to insert the return value
2374 vminfo = argslot;
2375 ek_opt = _adapter_opt_collect_ref;
2376 ensure_vmlayout_field(target, CHECK);
2377 // for MethodHandleWalk:
2378 if (java_lang_invoke_AdapterMethodHandle::is_instance(argument()))
2379 ensure_vmlayout_field(argument, CHECK);
2380 if (!OptimizeMethodHandles) break;
2381 switch (type2size[src]) {
2382 case 1:
2383 ek_try = EntryKind(_adapter_opt_filter_S0_ref + argslot);
2384 if (ek_try < _adapter_opt_collect_LAST &&
2385 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2386 assert(ek_adapter_opt_collect_count(ek_try) == 1 &&
2387 ek_adapter_opt_collect_type(ek_try) == T_OBJECT, "");
2388 ek_opt = ek_try;
2389 break;
2390 }
2391 // else downgrade to variable slot:
2392 ek_opt = _adapter_opt_collect_1_ref;
2393 break;
2394 case 2:
2395 ek_try = EntryKind(_adapter_opt_collect_2_S0_ref + argslot);
2396 if (ek_try < _adapter_opt_collect_LAST &&
2397 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2398 assert(ek_adapter_opt_collect_count(ek_try) == 2 &&
2399 ek_adapter_opt_collect_type(ek_try) == T_OBJECT, "");
2400 ek_opt = ek_try;
2401 break;
2402 }
2403 // else downgrade to variable slot:
2404 ek_opt = _adapter_opt_collect_2_ref;
2405 break;
2406 default:
2407 goto throw_not_impl;
2408 break;
2409 }
2410 }
2411 break;
2413 case _adapter_swap_args:
2414 case _adapter_rot_args:
2415 {
2416 int swap_slots = type2size[src];
2417 int src_slot = argslot;
2418 int dest_slot = vminfo;
2419 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1;
2420 switch (swap_slots) {
2421 case 1:
2422 ek_opt = (!rotate ? _adapter_opt_swap_1 :
2423 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down);
2424 break;
2425 case 2:
2426 ek_opt = (!rotate ? _adapter_opt_swap_2 :
2427 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down);
2428 break;
2429 default:
2430 goto throw_not_impl;
2431 break;
2432 }
2433 }
2434 break;
2436 case _adapter_spread_args:
2437 {
2438 #ifdef TARGET_ARCH_NYI_6939861
2439 // ports before 6939861 supported only three kinds of spread ops
2440 if (!UseRicochetFrames) {
2441 int array_size = slots_pushed + 1;
2442 assert(array_size >= 0, "");
2443 vminfo = array_size;
2444 switch (array_size) {
2445 case 0: ek_opt = _adapter_opt_spread_0; break;
2446 case 1: ek_opt = _adapter_opt_spread_1; break;
2447 default: ek_opt = _adapter_opt_spread_more; break;
2448 }
2449 break;
2450 }
2451 #endif //TARGET_ARCH_NYI_6939861
2452 // vminfo will be the required length of the array
2453 int array_size = (slots_pushed + 1) / (type2size[dest] == 2 ? 2 : 1);
2454 vminfo = array_size;
2455 // general case
2456 switch (dest) {
2457 case T_BOOLEAN : // fall through to T_BYTE:
2458 case T_BYTE : ek_opt = _adapter_opt_spread_byte; break;
2459 case T_CHAR : ek_opt = _adapter_opt_spread_char; break;
2460 case T_SHORT : ek_opt = _adapter_opt_spread_short; break;
2461 case T_INT : ek_opt = _adapter_opt_spread_int; break;
2462 case T_LONG : ek_opt = _adapter_opt_spread_long; break;
2463 case T_FLOAT : ek_opt = _adapter_opt_spread_float; break;
2464 case T_DOUBLE : ek_opt = _adapter_opt_spread_double; break;
2465 case T_OBJECT : ek_opt = _adapter_opt_spread_ref; break;
2466 case T_VOID : if (array_size != 0) goto throw_not_impl;
2467 ek_opt = _adapter_opt_spread_ref; break;
2468 default : goto throw_not_impl;
2469 }
2470 assert(array_size == 0 || // it doesn't matter what the spreader is
2471 (ek_adapter_opt_spread_count(ek_opt) == -1 &&
2472 (ek_adapter_opt_spread_type(ek_opt) == dest ||
2473 (ek_adapter_opt_spread_type(ek_opt) == T_BYTE && dest == T_BOOLEAN))),
2474 err_msg("dest=%d ek_opt=%d", dest, ek_opt));
2476 if (array_size <= 0) {
2477 // since the general case does not handle length 0, this case is required:
2478 ek_opt = _adapter_opt_spread_0;
2479 break;
2480 }
2481 if (dest == T_OBJECT) {
2482 ek_try = EntryKind(_adapter_opt_spread_1_ref - 1 + array_size);
2483 if (ek_try < _adapter_opt_spread_LAST &&
2484 ek_adapter_opt_spread_count(ek_try) == array_size) {
2485 assert(ek_adapter_opt_spread_type(ek_try) == dest, "");
2486 ek_opt = ek_try;
2487 break;
2488 }
2489 }
2490 break;
2491 }
2492 break;
2494 case _adapter_collect_args:
2495 {
2496 assert(UseRicochetFrames, "else don't come here");
2497 int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument()));
2498 // vminfo will be the location to insert the return value
2499 vminfo = argslot;
2500 ensure_vmlayout_field(target, CHECK);
2501 ensure_vmlayout_field(argument, CHECK);
2503 // general case:
2504 switch (dest) {
2505 default : if (!is_subword_type(dest)) goto throw_not_impl;
2506 // else fall through:
2507 case T_INT : ek_opt = _adapter_opt_collect_int; break;
2508 case T_LONG : ek_opt = _adapter_opt_collect_long; break;
2509 case T_FLOAT : ek_opt = _adapter_opt_collect_float; break;
2510 case T_DOUBLE : ek_opt = _adapter_opt_collect_double; break;
2511 case T_OBJECT : ek_opt = _adapter_opt_collect_ref; break;
2512 case T_VOID : ek_opt = _adapter_opt_collect_void; break;
2513 }
2514 assert(ek_adapter_opt_collect_slot(ek_opt) == -1 &&
2515 ek_adapter_opt_collect_count(ek_opt) == -1 &&
2516 (ek_adapter_opt_collect_type(ek_opt) == dest ||
2517 ek_adapter_opt_collect_type(ek_opt) == T_INT && is_subword_type(dest)),
2518 "");
2520 if (dest == T_OBJECT && elem_slots == 1 && OptimizeMethodHandles) {
2521 // filter operation on a ref
2522 ek_try = EntryKind(_adapter_opt_filter_S0_ref + argslot);
2523 if (ek_try < _adapter_opt_collect_LAST &&
2524 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2525 assert(ek_adapter_opt_collect_count(ek_try) == elem_slots &&
2526 ek_adapter_opt_collect_type(ek_try) == dest, "");
2527 ek_opt = ek_try;
2528 break;
2529 }
2530 ek_opt = _adapter_opt_collect_1_ref;
2531 break;
2532 }
2534 if (dest == T_OBJECT && elem_slots == 2 && OptimizeMethodHandles) {
2535 // filter of two arguments
2536 ek_try = EntryKind(_adapter_opt_collect_2_S0_ref + argslot);
2537 if (ek_try < _adapter_opt_collect_LAST &&
2538 ek_adapter_opt_collect_slot(ek_try) == argslot) {
2539 assert(ek_adapter_opt_collect_count(ek_try) == elem_slots &&
2540 ek_adapter_opt_collect_type(ek_try) == dest, "");
2541 ek_opt = ek_try;
2542 break;
2543 }
2544 ek_opt = _adapter_opt_collect_2_ref;
2545 break;
2546 }
2548 if (dest == T_OBJECT && OptimizeMethodHandles) {
2549 // try to use a fixed length adapter
2550 ek_try = EntryKind(_adapter_opt_collect_0_ref + elem_slots);
2551 if (ek_try < _adapter_opt_collect_LAST &&
2552 ek_adapter_opt_collect_count(ek_try) == elem_slots) {
2553 assert(ek_adapter_opt_collect_slot(ek_try) == -1 &&
2554 ek_adapter_opt_collect_type(ek_try) == dest, "");
2555 ek_opt = ek_try;
2556 break;
2557 }
2558 }
2560 break;
2561 }
2563 case _adapter_fold_args:
2564 {
2565 assert(UseRicochetFrames, "else don't come here");
2566 int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument()));
2567 // vminfo will be the location to insert the return value
2568 vminfo = argslot + elem_slots;
2569 ensure_vmlayout_field(target, CHECK);
2570 ensure_vmlayout_field(argument, CHECK);
2572 switch (dest) {
2573 default : if (!is_subword_type(dest)) goto throw_not_impl;
2574 // else fall through:
2575 case T_INT : ek_opt = _adapter_opt_fold_int; break;
2576 case T_LONG : ek_opt = _adapter_opt_fold_long; break;
2577 case T_FLOAT : ek_opt = _adapter_opt_fold_float; break;
2578 case T_DOUBLE : ek_opt = _adapter_opt_fold_double; break;
2579 case T_OBJECT : ek_opt = _adapter_opt_fold_ref; break;
2580 case T_VOID : ek_opt = _adapter_opt_fold_void; break;
2581 }
2582 assert(ek_adapter_opt_collect_slot(ek_opt) == -1 &&
2583 ek_adapter_opt_collect_count(ek_opt) == -1 &&
2584 (ek_adapter_opt_collect_type(ek_opt) == dest ||
2585 ek_adapter_opt_collect_type(ek_opt) == T_INT && is_subword_type(dest)),
2586 "");
2588 if (dest == T_OBJECT && elem_slots == 0 && OptimizeMethodHandles) {
2589 // if there are no args, just pretend it's a collect
2590 ek_opt = _adapter_opt_collect_0_ref;
2591 break;
2592 }
2594 if (dest == T_OBJECT && OptimizeMethodHandles) {
2595 // try to use a fixed length adapter
2596 ek_try = EntryKind(_adapter_opt_fold_1_ref - 1 + elem_slots);
2597 if (ek_try < _adapter_opt_fold_LAST &&
2598 ek_adapter_opt_collect_count(ek_try) == elem_slots) {
2599 assert(ek_adapter_opt_collect_slot(ek_try) == -1 &&
2600 ek_adapter_opt_collect_type(ek_try) == dest, "");
2601 ek_opt = ek_try;
2602 break;
2603 }
2604 }
2606 break;
2607 }
2609 default:
2610 // should have failed much earlier; must be a missing case here
2611 assert(false, "incomplete switch");
2612 // and fall through:
2614 throw_not_impl:
2615 if (err == NULL)
2616 err = "unknown adapter type";
2617 break;
2618 }
2620 if (err == NULL && (vminfo & CONV_VMINFO_MASK) != vminfo) {
2621 // should not happen, since vminfo is used to encode arg/slot indexes < 255
2622 err = "vminfo overflow";
2623 }
2625 if (err == NULL && !have_entry(ek_opt)) {
2626 err = "adapter stub for this kind of method handle is missing";
2627 }
2629 if (err == NULL && ek_opt == ek_orig) {
2630 switch (ek_opt) {
2631 case _adapter_prim_to_prim:
2632 case _adapter_ref_to_prim:
2633 case _adapter_prim_to_ref:
2634 case _adapter_swap_args:
2635 case _adapter_rot_args:
2636 case _adapter_collect_args:
2637 case _adapter_fold_args:
2638 case _adapter_spread_args:
2639 // should be handled completely by optimized cases; see above
2640 err = "init_AdapterMethodHandle should not issue this";
2641 break;
2642 }
2643 }
2645 if (err != NULL) {
2646 throw_InternalError_for_bad_conversion(conversion, err_msg("%s: conv_op %d ek_opt %d", err, conv_op, ek_opt), THREAD);
2647 return;
2648 }
2650 // Rebuild the conversion value; maybe parts of it were changed.
2651 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo);
2653 // Finalize the conversion field. (Note that it is final to Java code.)
2654 java_lang_invoke_AdapterMethodHandle::set_conversion(mh(), new_conversion);
2656 // Done!
2657 java_lang_invoke_MethodHandle::set_vmentry(mh(), entry(ek_opt));
2659 // There should be enough memory barriers on exit from native methods
2660 // to ensure that the MH is fully initialized to all threads before
2661 // Java code can publish it in global data structures.
2662 }
2664 void MethodHandles::ensure_vmlayout_field(Handle target, TRAPS) {
2665 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(target()));
2666 Handle mtform(THREAD, java_lang_invoke_MethodType::form(mtype()));
2667 if (mtform.is_null()) { THROW(vmSymbols::java_lang_InternalError()); }
2668 if (java_lang_invoke_MethodTypeForm::vmlayout_offset_in_bytes() > 0) {
2669 if (java_lang_invoke_MethodTypeForm::vmlayout(mtform()) == NULL) {
2670 // fill it in
2671 Handle erased_mtype(THREAD, java_lang_invoke_MethodTypeForm::erasedType(mtform()));
2672 TempNewSymbol erased_signature
2673 = java_lang_invoke_MethodType::as_signature(erased_mtype(), /*intern:*/true, CHECK);
2674 methodOop cookie
2675 = SystemDictionary::find_method_handle_invoke(vmSymbols::invokeExact_name(),
2676 erased_signature,
2677 SystemDictionaryHandles::Object_klass(),
2678 THREAD);
2679 java_lang_invoke_MethodTypeForm::init_vmlayout(mtform(), cookie);
2680 }
2681 }
2682 }
2684 #ifdef ASSERT
2686 extern "C"
2687 void print_method_handle(oop mh);
2689 static void stress_method_handle_walk_impl(Handle mh, TRAPS) {
2690 if (StressMethodHandleWalk) {
2691 // Exercise the MethodHandleWalk code in various ways and validate
2692 // the resulting method oop. Some of these produce output so they
2693 // are guarded under Verbose.
2694 ResourceMark rm;
2695 HandleMark hm;
2696 if (Verbose) {
2697 print_method_handle(mh());
2698 }
2699 TempNewSymbol name = SymbolTable::new_symbol("invoke", CHECK);
2700 Handle mt = java_lang_invoke_MethodHandle::type(mh());
2701 TempNewSymbol signature = java_lang_invoke_MethodType::as_signature(mt(), true, CHECK);
2702 MethodHandleCompiler mhc(mh, name, signature, 10000, false, CHECK);
2703 methodHandle m = mhc.compile(CHECK);
2704 if (Verbose) {
2705 m->print_codes();
2706 }
2707 InterpreterOopMap mask;
2708 OopMapCache::compute_one_oop_map(m, m->code_size() - 1, &mask);
2709 // compile to object code if -Xcomp or WizardMode
2710 if ((WizardMode ||
2711 CompilationPolicy::must_be_compiled(m))
2712 && !instanceKlass::cast(m->method_holder())->is_not_initialized()
2713 && CompilationPolicy::can_be_compiled(m)) {
2714 // Force compilation
2715 CompileBroker::compile_method(m, InvocationEntryBci,
2716 CompLevel_initial_compile,
2717 methodHandle(), 0, "StressMethodHandleWalk",
2718 CHECK);
2719 }
2720 }
2721 }
2723 static void stress_method_handle_walk(Handle mh, TRAPS) {
2724 stress_method_handle_walk_impl(mh, THREAD);
2725 if (HAS_PENDING_EXCEPTION) {
2726 oop ex = PENDING_EXCEPTION;
2727 CLEAR_PENDING_EXCEPTION;
2728 tty->print("StressMethodHandleWalk: ");
2729 java_lang_Throwable::print(ex, tty);
2730 tty->cr();
2731 }
2732 }
2733 #else
2735 static void stress_method_handle_walk(Handle mh, TRAPS) {}
2737 #endif
2739 //
2740 // Here are the native methods on sun.invoke.MethodHandleImpl.
2741 // They are the private interface between this JVM and the HotSpot-specific
2742 // Java code that implements JSR 292 method handles.
2743 //
2744 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
2745 // that intrinsic (non-JNI) native methods are defined in HotSpot.
2746 //
2748 // direct method handles for invokestatic or invokespecial
2749 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller);
2750 JVM_ENTRY(void, MHN_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2751 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) {
2752 ResourceMark rm; // for error messages
2754 // This is the guy we are initializing:
2755 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2756 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2758 // Early returns out of this method leave the DMH in an unfinished state.
2759 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2761 // which method are we really talking about?
2762 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2763 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2764 if (java_lang_invoke_MemberName::is_instance(target()) &&
2765 java_lang_invoke_MemberName::vmindex(target()) == VM_INDEX_UNINITIALIZED) {
2766 MethodHandles::resolve_MemberName(target, CHECK);
2767 }
2769 KlassHandle receiver_limit; int decode_flags = 0;
2770 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags);
2771 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); }
2773 // The trusted Java code that calls this method should already have performed
2774 // access checks on behalf of the given caller. But, we can verify this.
2775 if (VerifyMethodHandles && caller_jh != NULL) {
2776 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)));
2777 // If this were a bytecode, the first access check would be against
2778 // the "reference class" mentioned in the CONSTANT_Methodref.
2779 // We don't know at this point which class that was, and if we
2780 // check against m.method_holder we might get the wrong answer.
2781 // So we just make sure to handle this check when the resolution
2782 // happens, when we call resolve_MemberName.
2783 //
2784 // (A public class can inherit public members from private supers,
2785 // and it would be wrong to check access against the private super
2786 // if the original symbolic reference was against the public class.)
2787 //
2788 // If there were a bytecode, the next step would be to lookup the method
2789 // in the reference class, then then check the method's access bits.
2790 // Emulate LinkResolver::check_method_accessability.
2791 klassOop resolved_klass = m->method_holder();
2792 if (!Reflection::verify_field_access(caller->as_klassOop(),
2793 resolved_klass, resolved_klass,
2794 m->access_flags(),
2795 true)) {
2796 // %%% following cutout belongs in Reflection::verify_field_access?
2797 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(),
2798 resolved_klass, THREAD);
2799 if (!same_pm) {
2800 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string());
2801 }
2802 }
2803 }
2805 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK);
2806 stress_method_handle_walk(mh, CHECK);
2807 }
2808 JVM_END
2810 // bound method handles
2811 JVM_ENTRY(void, MHN_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2812 jobject target_jh, int argnum)) {
2813 ResourceMark rm; // for error messages
2815 // This is the guy we are initializing:
2816 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2817 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2819 // Early returns out of this method leave the BMH in an unfinished state.
2820 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2822 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2823 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2825 if (!java_lang_invoke_MethodHandle::is_instance(target())) {
2826 // Target object is a reflective method. (%%% Do we need this alternate path?)
2827 Untested("init_BMH of non-MH");
2828 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); }
2829 KlassHandle receiver_limit; int decode_flags = 0;
2830 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags);
2831 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m,
2832 receiver_limit,
2833 decode_flags,
2834 CHECK);
2835 } else {
2836 // Build a BMH on top of a DMH or another BMH:
2837 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK);
2838 }
2840 if (StressMethodHandleWalk) {
2841 if (mh->klass() == SystemDictionary::BoundMethodHandle_klass())
2842 stress_method_handle_walk(mh, CHECK);
2843 // else don't, since the subclass has not yet initialized its own fields
2844 }
2845 }
2846 JVM_END
2848 // adapter method handles
2849 JVM_ENTRY(void, MHN_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2850 jobject target_jh, int argnum)) {
2851 // This is the guy we are initializing:
2852 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); }
2853 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2854 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2855 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2857 // Early returns out of this method leave the AMH in an unfinished state.
2858 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2860 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK);
2861 stress_method_handle_walk(mh, CHECK);
2862 }
2863 JVM_END
2865 // method type forms
2866 JVM_ENTRY(void, MHN_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) {
2867 if (erased_jh == NULL) return;
2868 if (TraceMethodHandles) {
2869 tty->print("creating MethodType form ");
2870 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH!
2871 // call Object.toString()
2872 Symbol* name = vmSymbols::toString_name();
2873 Symbol* sig = vmSymbols::void_string_signature();
2874 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh)));
2875 JavaValue result(T_OBJECT);
2876 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig,
2877 &args, CHECK);
2878 Handle str(THREAD, (oop)result.get_jobject());
2879 java_lang_String::print(str, tty);
2880 }
2881 tty->cr();
2882 }
2883 }
2884 JVM_END
2886 // debugging and reflection
2887 JVM_ENTRY(jobject, MHN_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) {
2888 Handle mh(THREAD, JNIHandles::resolve(mh_jh));
2889 if (!java_lang_invoke_MethodHandle::is_instance(mh())) {
2890 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
2891 }
2892 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL);
2893 return JNIHandles::make_local(THREAD, target);
2894 }
2895 JVM_END
2897 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
2898 switch (which) {
2899 case MethodHandles::GC_JVM_PUSH_LIMIT:
2900 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF,
2901 "MethodHandlePushLimit parameter must be in valid range");
2902 return MethodHandlePushLimit;
2903 case MethodHandles::GC_JVM_STACK_MOVE_UNIT:
2904 // return number of words per slot, signed according to stack direction
2905 return MethodHandles::stack_move_unit();
2906 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK:
2907 return MethodHandles::adapter_conversion_ops_supported_mask();
2908 case MethodHandles::GC_OP_ROT_ARGS_DOWN_LIMIT_BIAS:
2909 return MethodHandles::OP_ROT_ARGS_DOWN_LIMIT_BIAS;
2910 }
2911 return 0;
2912 }
2913 JVM_END
2915 #ifndef PRODUCT
2916 #define EACH_NAMED_CON(template) \
2917 /* hold back this one until JDK stabilizes */ \
2918 /* template(MethodHandles,GC_JVM_PUSH_LIMIT) */ \
2919 /* hold back this one until JDK stabilizes */ \
2920 /* template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) */ \
2921 /* hold back this one until JDK stabilizes */ \
2922 /* template(MethodHandles,GC_OP_ROT_ARGS_DOWN_LIMIT_BIAS) */ \
2923 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \
2924 template(MethodHandles,ETF_DIRECT_HANDLE) \
2925 template(MethodHandles,ETF_METHOD_NAME) \
2926 template(MethodHandles,ETF_REFLECT_METHOD) \
2927 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
2928 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
2929 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
2930 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
2931 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
2932 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
2933 template(java_lang_invoke_MemberName,VM_INDEX_UNINITIALIZED) \
2934 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_ONLY) \
2935 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_RAW) \
2936 template(java_lang_invoke_AdapterMethodHandle,OP_CHECK_CAST) \
2937 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_PRIM) \
2938 template(java_lang_invoke_AdapterMethodHandle,OP_REF_TO_PRIM) \
2939 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_REF) \
2940 template(java_lang_invoke_AdapterMethodHandle,OP_SWAP_ARGS) \
2941 template(java_lang_invoke_AdapterMethodHandle,OP_ROT_ARGS) \
2942 template(java_lang_invoke_AdapterMethodHandle,OP_DUP_ARGS) \
2943 template(java_lang_invoke_AdapterMethodHandle,OP_DROP_ARGS) \
2944 template(java_lang_invoke_AdapterMethodHandle,OP_COLLECT_ARGS) \
2945 template(java_lang_invoke_AdapterMethodHandle,OP_SPREAD_ARGS) \
2946 /* hold back this one until JDK stabilizes */ \
2947 /*template(java_lang_invoke_AdapterMethodHandle,CONV_OP_LIMIT)*/ \
2948 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_MASK) \
2949 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_MASK) \
2950 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_SHIFT) \
2951 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_SHIFT) \
2952 template(java_lang_invoke_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \
2953 template(java_lang_invoke_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \
2954 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \
2955 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \
2956 /*end*/
2958 #define ONE_PLUS(scope,value) 1+
2959 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0;
2960 #define VALUE_COMMA(scope,value) scope::value,
2961 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 };
2962 #define STRING_NULL(scope,value) #value "\0"
2963 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) };
2965 #undef ONE_PLUS
2966 #undef VALUE_COMMA
2967 #undef STRING_NULL
2968 #undef EACH_NAMED_CON
2969 #endif
2971 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
2972 #ifndef PRODUCT
2973 if (which >= 0 && which < con_value_count) {
2974 int con = con_values[which];
2975 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
2976 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
2977 const char* str = &con_names[0];
2978 for (int i = 0; i < which; i++)
2979 str += strlen(str) + 1; // skip name and null
2980 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
2981 box->obj_at_put(0, name);
2982 }
2983 return con;
2984 }
2985 #endif
2986 return 0;
2987 }
2988 JVM_END
2990 // void init(MemberName self, AccessibleObject ref)
2991 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
2992 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
2993 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
2994 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2995 oop target_oop = JNIHandles::resolve_non_null(target_jh);
2996 MethodHandles::init_MemberName(mname(), target_oop);
2997 }
2998 JVM_END
3000 // void expand(MemberName self)
3001 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
3002 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
3003 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
3004 MethodHandles::expand_MemberName(mname, 0, CHECK);
3005 }
3006 JVM_END
3008 // void resolve(MemberName self, Class<?> caller)
3009 JVM_ENTRY(void, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_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));
3013 // The trusted Java code that calls this method should already have performed
3014 // access checks on behalf of the given caller. But, we can verify this.
3015 if (VerifyMethodHandles && caller_jh != NULL) {
3016 klassOop reference_klass = java_lang_Class::as_klassOop(java_lang_invoke_MemberName::clazz(mname()));
3017 if (reference_klass != NULL) {
3018 // Emulate LinkResolver::check_klass_accessability.
3019 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh));
3020 if (!Reflection::verify_class_access(caller,
3021 reference_klass,
3022 true)) {
3023 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name());
3024 }
3025 }
3026 }
3028 MethodHandles::resolve_MemberName(mname, CHECK);
3029 }
3030 JVM_END
3032 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
3033 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
3034 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
3035 jclass clazz_jh, jstring name_jh, jstring sig_jh,
3036 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
3037 if (clazz_jh == NULL || results_jh == NULL) return -1;
3038 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)));
3040 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
3041 if (results.is_null() || !results->is_objArray()) return -1;
3043 TempNewSymbol name = NULL;
3044 TempNewSymbol sig = NULL;
3045 if (name_jh != NULL) {
3046 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
3047 if (name == NULL) return 0; // a match is not possible
3048 }
3049 if (sig_jh != NULL) {
3050 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
3051 if (sig == NULL) return 0; // a match is not possible
3052 }
3054 KlassHandle caller;
3055 if (caller_jh != NULL) {
3056 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
3057 if (!java_lang_Class::is_instance(caller_oop)) return -1;
3058 caller = KlassHandle(THREAD, java_lang_Class::as_klassOop(caller_oop));
3059 }
3061 if (name != NULL && sig != NULL && results.not_null()) {
3062 // try a direct resolve
3063 // %%% TO DO
3064 }
3066 int res = MethodHandles::find_MemberNames(k(), name, sig, mflags,
3067 caller(), skip, results());
3068 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
3069 return res;
3070 }
3071 JVM_END
3073 methodOop MethodHandles::resolve_raise_exception_method(TRAPS) {
3074 if (_raise_exception_method != NULL) {
3075 // no need to do it twice
3076 return raise_exception_method();
3077 }
3078 // LinkResolver::resolve_invokedynamic can reach this point
3079 // because an invokedynamic has failed very early (7049415)
3080 KlassHandle MHN_klass = SystemDictionaryHandles::MethodHandleNatives_klass();
3081 if (MHN_klass.not_null()) {
3082 TempNewSymbol raiseException_name = SymbolTable::new_symbol("raiseException", CHECK_NULL);
3083 TempNewSymbol raiseException_sig = SymbolTable::new_symbol("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK_NULL);
3084 methodOop raiseException_method = instanceKlass::cast(MHN_klass->as_klassOop())
3085 ->find_method(raiseException_name, raiseException_sig);
3086 if (raiseException_method != NULL && raiseException_method->is_static()) {
3087 return raiseException_method;
3088 }
3089 }
3090 // not found; let the caller deal with it
3091 return NULL;
3092 }
3093 void MethodHandles::raise_exception(int code, oop actual, oop required, TRAPS) {
3094 methodOop raiseException_method = resolve_raise_exception_method(CHECK);
3095 if (raiseException_method != NULL &&
3096 instanceKlass::cast(raiseException_method->method_holder())->is_not_initialized()) {
3097 instanceKlass::cast(raiseException_method->method_holder())->initialize(CHECK);
3098 // it had better be resolved by now, or maybe JSR 292 failed to load
3099 raiseException_method = raise_exception_method();
3100 }
3101 if (raiseException_method == NULL) {
3102 THROW_MSG(vmSymbols::java_lang_InternalError(), "no raiseException method");
3103 }
3104 JavaCallArguments args;
3105 args.push_int(code);
3106 args.push_oop(actual);
3107 args.push_oop(required);
3108 JavaValue result(T_VOID);
3109 JavaCalls::call(&result, raiseException_method, &args, CHECK);
3110 }
3112 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) {
3113 TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL);
3114 THROW_MSG_NULL(UOE_name, "MethodHandle.invoke cannot be invoked reflectively");
3115 return NULL;
3116 }
3117 JVM_END
3119 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) {
3120 TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL);
3121 THROW_MSG_NULL(UOE_name, "MethodHandle.invokeExact cannot be invoked reflectively");
3122 return NULL;
3123 }
3124 JVM_END
3127 /// JVM_RegisterMethodHandleMethods
3129 #define LANG "Ljava/lang/"
3130 #define JLINV "Ljava/lang/invoke/"
3132 #define OBJ LANG"Object;"
3133 #define CLS LANG"Class;"
3134 #define STRG LANG"String;"
3135 #define MT JLINV"MethodType;"
3136 #define MH JLINV"MethodHandle;"
3137 #define MEM JLINV"MemberName;"
3138 #define AMH JLINV"AdapterMethodHandle;"
3139 #define BMH JLINV"BoundMethodHandle;"
3140 #define DMH JLINV"DirectMethodHandle;"
3142 #define CC (char*) /*cast a literal from (const char*)*/
3143 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
3145 // These are the native methods on sun.invoke.MethodHandleNatives.
3146 static JNINativeMethod methods[] = {
3147 // void init(MemberName self, AccessibleObject ref)
3148 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHN_init_AMH)},
3149 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHN_init_BMH)},
3150 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHN_init_DMH)},
3151 {CC"init", CC"("MT")V", FN_PTR(MHN_init_MT)},
3152 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
3153 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
3154 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHN_resolve_Mem)},
3155 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHN_getTarget)},
3156 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
3157 // static native int getNamedCon(int which, Object[] name)
3158 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
3159 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
3160 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
3161 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}
3162 };
3164 static JNINativeMethod invoke_methods[] = {
3165 // void init(MemberName self, AccessibleObject ref)
3166 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
3167 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
3168 };
3170 // This one function is exported, used by NativeLookup.
3172 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
3173 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK");
3175 if (!EnableInvokeDynamic) {
3176 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
3177 return; // bind nothing
3178 }
3180 bool enable_MH = true;
3182 {
3183 ThreadToNativeFromVM ttnfv(thread);
3185 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod));
3186 if (!env->ExceptionOccurred()) {
3187 const char* L_MH_name = (JLINV "MethodHandle");
3188 const char* MH_name = L_MH_name+1;
3189 jclass MH_class = env->FindClass(MH_name);
3190 status = env->RegisterNatives(MH_class, invoke_methods, sizeof(invoke_methods)/sizeof(JNINativeMethod));
3191 }
3192 if (env->ExceptionOccurred()) {
3193 MethodHandles::set_enabled(false);
3194 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
3195 enable_MH = false;
3196 env->ExceptionClear();
3197 }
3198 }
3200 if (enable_MH) {
3201 methodOop raiseException_method = MethodHandles::resolve_raise_exception_method(CHECK);
3202 if (raiseException_method != NULL) {
3203 MethodHandles::set_raise_exception_method(raiseException_method);
3204 } else {
3205 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
3206 enable_MH = false;
3207 }
3208 }
3210 if (enable_MH) {
3211 MethodHandles::generate_adapters();
3212 MethodHandles::set_enabled(true);
3213 }
3214 }
3215 JVM_END