Mercurial > hg > graal-compiler
annotate src/share/vm/prims/methodHandles.cpp @ 948:89e0543e1737
6884624: Update copyright year
Summary: Update copyright for files that have been modified in 2009 through Septermber
Reviewed-by: tbell, ohair
author | xdono |
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date | Tue, 22 Sep 2009 14:06:10 -0700 |
parents | be93aad57795 |
children | 987e948ebbc8 |
rev | line source |
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710 | 1 /* |
2 * Copyright 2008-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 /* | |
26 * JSR 292 reference implementation: method handles | |
27 */ | |
28 | |
29 #include "incls/_precompiled.incl" | |
30 #include "incls/_methodHandles.cpp.incl" | |
31 | |
32 bool MethodHandles::_enabled = false; // set true after successful native linkage | |
33 | |
34 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL}; | |
35 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = { | |
36 "check_mtype", | |
37 "wrong_method_type", // what happens when there is a type mismatch | |
38 "invokestatic", // how a MH emulates invokestatic | |
39 "invokespecial", // ditto for the other invokes... | |
40 "invokevirtual", | |
41 "invokeinterface", | |
42 "bound_ref", // these are for BMH... | |
43 "bound_int", | |
44 "bound_long", | |
45 "bound_ref_direct", // (direct versions have a direct methodOop) | |
46 "bound_int_direct", | |
47 "bound_long_direct", | |
48 | |
49 // starting at _adapter_mh_first: | |
50 "adapter_retype_only", // these are for AMH... | |
51 "adapter_check_cast", | |
52 "adapter_prim_to_prim", | |
53 "adapter_ref_to_prim", | |
54 "adapter_prim_to_ref", | |
55 "adapter_swap_args", | |
56 "adapter_rot_args", | |
57 "adapter_dup_args", | |
58 "adapter_drop_args", | |
59 "adapter_collect_args", | |
60 "adapter_spread_args", | |
61 "adapter_flyby", | |
62 "adapter_ricochet", | |
63 | |
64 // optimized adapter types: | |
65 "adapter_swap_args/1", | |
66 "adapter_swap_args/2", | |
67 "adapter_rot_args/1,up", | |
68 "adapter_rot_args/1,down", | |
69 "adapter_rot_args/2,up", | |
70 "adapter_rot_args/2,down", | |
71 "adapter_prim_to_prim/i2i", | |
72 "adapter_prim_to_prim/l2i", | |
73 "adapter_prim_to_prim/d2f", | |
74 "adapter_prim_to_prim/i2l", | |
75 "adapter_prim_to_prim/f2d", | |
76 "adapter_ref_to_prim/unboxi", | |
77 "adapter_ref_to_prim/unboxl", | |
78 "adapter_spread_args/0", | |
79 "adapter_spread_args/1", | |
80 "adapter_spread_args/more", | |
81 | |
82 NULL | |
83 }; | |
84 | |
85 #ifdef ASSERT | |
86 bool MethodHandles::spot_check_entry_names() { | |
87 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), ""); | |
88 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), ""); | |
89 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), ""); | |
90 assert(!strcmp(entry_name(_adapter_ricochet), "adapter_ricochet"), ""); | |
91 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), ""); | |
92 return true; | |
93 } | |
94 #endif | |
95 | |
96 void MethodHandles::set_enabled(bool z) { | |
97 if (_enabled != z) { | |
98 guarantee(z && EnableMethodHandles, "can only enable once, and only if -XX:+EnableMethodHandles"); | |
99 _enabled = z; | |
100 } | |
101 } | |
102 | |
103 // Note: A method which does not have a TRAPS argument cannot block in the GC | |
104 // or throw exceptions. Such methods are used in this file to do something quick | |
105 // and local, like parse a data structure. For speed, such methods work on plain | |
106 // oops, not handles. Trapping methods uniformly operate on handles. | |
107 | |
108 methodOop MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype, | |
109 klassOop& receiver_limit_result, int& decode_flags_result) { | |
110 if (vmtarget == NULL) return NULL; | |
111 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding"); | |
112 if (vmindex < 0) { | |
113 // this DMH performs no dispatch; it is directly bound to a methodOop | |
114 // A MemberName may either be directly bound to a methodOop, | |
115 // or it may use the klass/index form; both forms mean the same thing. | |
116 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result); | |
117 if ((decode_flags_result & _dmf_has_receiver) != 0 | |
118 && java_dyn_MethodType::is_instance(mtype)) { | |
119 // Extract receiver type restriction from mtype.ptypes[0]. | |
120 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype); | |
121 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0); | |
122 if (java_lang_Class::is_instance(ptype0)) | |
123 receiver_limit_result = java_lang_Class::as_klassOop(ptype0); | |
124 } | |
125 if (vmindex == methodOopDesc::nonvirtual_vtable_index) { | |
126 // this DMH can be an "invokespecial" version | |
127 decode_flags_result &= ~_dmf_does_dispatch; | |
128 } else { | |
129 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?"); | |
130 } | |
131 return m; | |
132 } else { | |
133 decode_flags_result |= MethodHandles::_dmf_does_dispatch; | |
134 assert(vmtarget->is_klass(), "must be class or interface"); | |
135 receiver_limit_result = (klassOop)vmtarget; | |
136 Klass* tk = Klass::cast((klassOop)vmtarget); | |
137 if (tk->is_interface()) { | |
138 // an itable linkage is <interface, itable index> | |
139 decode_flags_result |= MethodHandles::_dmf_from_interface; | |
140 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex); | |
141 } else { | |
142 if (!tk->oop_is_instance()) | |
143 tk = instanceKlass::cast(SystemDictionary::object_klass()); | |
144 return ((instanceKlass*)tk)->method_at_vtable(vmindex); | |
145 } | |
146 } | |
147 } | |
148 | |
149 // MemberName and DirectMethodHandle have the same linkage to the JVM internals. | |
150 // (MemberName is the non-operational name used for queries and setup.) | |
151 | |
152 methodOop MethodHandles::decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
153 oop vmtarget = sun_dyn_DirectMethodHandle::vmtarget(mh); | |
154 int vmindex = sun_dyn_DirectMethodHandle::vmindex(mh); | |
155 oop mtype = sun_dyn_DirectMethodHandle::type(mh); | |
156 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result); | |
157 } | |
158 | |
159 methodOop MethodHandles::decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
160 assert(mh->klass() == SystemDictionary::BoundMethodHandle_klass(), ""); | |
161 for (oop bmh = mh;;) { | |
162 // Bound MHs can be stacked to bind several arguments. | |
163 oop target = java_dyn_MethodHandle::vmtarget(bmh); | |
164 if (target == NULL) return NULL; | |
165 decode_flags_result |= MethodHandles::_dmf_binds_argument; | |
166 klassOop tk = target->klass(); | |
167 if (tk == SystemDictionary::BoundMethodHandle_klass()) { | |
168 bmh = target; | |
169 continue; | |
170 } else { | |
171 if (java_dyn_MethodHandle::is_subclass(tk)) { | |
172 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH"); | |
173 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result); | |
174 } else { | |
175 // Optimized case: binding a receiver to a non-dispatched DMH | |
176 // short-circuits directly to the methodOop. | |
177 assert(target->is_method(), "must be a simple method"); | |
178 methodOop m = (methodOop) target; | |
179 DEBUG_ONLY(int argslot = sun_dyn_BoundMethodHandle::vmargslot(bmh)); | |
180 assert(argslot == m->size_of_parameters() - 1, "must be initial argument (receiver)"); | |
181 decode_flags_result |= MethodHandles::_dmf_binds_method; | |
182 return m; | |
183 } | |
184 } | |
185 } | |
186 } | |
187 | |
188 methodOop MethodHandles::decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
189 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), ""); | |
190 for (oop amh = mh;;) { | |
191 // Adapter MHs can be stacked to convert several arguments. | |
192 int conv_op = adapter_conversion_op(sun_dyn_AdapterMethodHandle::conversion(amh)); | |
193 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK; | |
194 oop target = java_dyn_MethodHandle::vmtarget(amh); | |
195 if (target == NULL) return NULL; | |
196 klassOop tk = target->klass(); | |
197 if (tk == SystemDictionary::AdapterMethodHandle_klass()) { | |
198 amh = target; | |
199 continue; | |
200 } else { | |
201 // must be a BMH (which will bind some more arguments) or a DMH (for the final call) | |
202 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result); | |
203 } | |
204 } | |
205 } | |
206 | |
207 methodOop MethodHandles::decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
208 if (mh == NULL) return NULL; | |
209 klassOop mhk = mh->klass(); | |
210 assert(java_dyn_MethodHandle::is_subclass(mhk), "must be a MethodHandle"); | |
211 if (mhk == SystemDictionary::DirectMethodHandle_klass()) { | |
212 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
213 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) { | |
214 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
215 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) { | |
216 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
217 } else { | |
218 assert(false, "cannot parse this MH"); | |
219 return NULL; // random MH? | |
220 } | |
221 } | |
222 | |
223 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) { | |
224 assert(m->is_method(), ""); | |
225 if (m->is_static()) { | |
226 // check that signature begins '(L' or '([' (not '(I', '()', etc.) | |
227 symbolOop sig = m->signature(); | |
228 BasicType recv_bt = char2type(sig->byte_at(1)); | |
229 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')' | |
230 assert(sig->byte_at(0) == '(', "must be method sig"); | |
231 if (recv_bt == T_OBJECT || recv_bt == T_ARRAY) | |
232 decode_flags_result |= _dmf_has_receiver; | |
233 } else { | |
234 // non-static method | |
235 decode_flags_result |= _dmf_has_receiver; | |
236 if (!m->can_be_statically_bound() && !m->is_initializer()) { | |
237 decode_flags_result |= _dmf_does_dispatch; | |
238 if (Klass::cast(m->method_holder())->is_interface()) | |
239 decode_flags_result |= _dmf_from_interface; | |
240 } | |
241 } | |
242 return m; | |
243 } | |
244 | |
245 | |
246 // A trusted party is handing us a cookie to determine a method. | |
247 // Let's boil it down to the method oop they really want. | |
248 methodOop MethodHandles::decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result) { | |
249 decode_flags_result = 0; | |
250 receiver_limit_result = NULL; | |
251 klassOop xk = x->klass(); | |
252 if (xk == Universe::methodKlassObj()) { | |
253 return decode_methodOop((methodOop) x, decode_flags_result); | |
254 } else if (xk == SystemDictionary::MemberName_klass()) { | |
255 // Note: This only works if the MemberName has already been resolved. | |
256 return decode_MemberName(x, receiver_limit_result, decode_flags_result); | |
257 } else if (java_dyn_MethodHandle::is_subclass(xk)) { | |
258 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result); | |
259 } else if (xk == SystemDictionary::reflect_method_klass()) { | |
260 oop clazz = java_lang_reflect_Method::clazz(x); | |
261 int slot = java_lang_reflect_Method::slot(x); | |
262 klassOop k = java_lang_Class::as_klassOop(clazz); | |
263 if (k != NULL && Klass::cast(k)->oop_is_instance()) | |
264 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), | |
265 decode_flags_result); | |
266 } else if (xk == SystemDictionary::reflect_constructor_klass()) { | |
267 oop clazz = java_lang_reflect_Constructor::clazz(x); | |
268 int slot = java_lang_reflect_Constructor::slot(x); | |
269 klassOop k = java_lang_Class::as_klassOop(clazz); | |
270 if (k != NULL && Klass::cast(k)->oop_is_instance()) | |
271 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), | |
272 decode_flags_result); | |
273 } else { | |
274 // unrecognized object | |
275 assert(!x->is_method(), "already checked"); | |
276 assert(!sun_dyn_MemberName::is_instance(x), "already checked"); | |
277 } | |
278 return NULL; | |
279 } | |
280 | |
281 | |
282 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) { | |
283 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass()) | |
284 return 0; // no push/pop | |
285 int this_vmslots = java_dyn_MethodHandle::vmslots(mh); | |
286 int last_vmslots = 0; | |
287 oop last_mh = mh; | |
288 for (;;) { | |
289 oop target = java_dyn_MethodHandle::vmtarget(last_mh); | |
290 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { | |
291 last_vmslots = java_dyn_MethodHandle::vmslots(target); | |
292 break; | |
293 } else if (!java_dyn_MethodHandle::is_instance(target)) { | |
294 // might be klass or method | |
295 assert(target->is_method(), "must get here with a direct ref to method"); | |
296 last_vmslots = methodOop(target)->size_of_parameters(); | |
297 break; | |
298 } | |
299 last_mh = target; | |
300 } | |
301 // If I am called with fewer VM slots than my ultimate callee, | |
302 // it must be that I push the additionally needed slots. | |
303 // Likewise if am called with more VM slots, I will pop them. | |
304 return (last_vmslots - this_vmslots); | |
305 } | |
306 | |
307 | |
308 // MemberName support | |
309 | |
310 // import sun_dyn_MemberName.* | |
311 enum { | |
312 IS_METHOD = sun_dyn_MemberName::MN_IS_METHOD, | |
313 IS_CONSTRUCTOR = sun_dyn_MemberName::MN_IS_CONSTRUCTOR, | |
314 IS_FIELD = sun_dyn_MemberName::MN_IS_FIELD, | |
315 IS_TYPE = sun_dyn_MemberName::MN_IS_TYPE, | |
316 SEARCH_SUPERCLASSES = sun_dyn_MemberName::MN_SEARCH_SUPERCLASSES, | |
317 SEARCH_INTERFACES = sun_dyn_MemberName::MN_SEARCH_INTERFACES, | |
318 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE, | |
319 VM_INDEX_UNINITIALIZED = sun_dyn_MemberName::VM_INDEX_UNINITIALIZED | |
320 }; | |
321 | |
322 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) { | |
323 if (target_oop->klass() == SystemDictionary::reflect_field_klass()) { | |
324 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() | |
325 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() | |
326 int mods = java_lang_reflect_Field::modifiers(target_oop); | |
327 klassOop k = java_lang_Class::as_klassOop(clazz); | |
328 int offset = instanceKlass::cast(k)->offset_from_fields(slot); | |
329 init_MemberName(mname_oop, k, accessFlags_from(mods), offset); | |
330 } else { | |
331 int decode_flags = 0; klassOop receiver_limit = NULL; | |
332 methodOop m = MethodHandles::decode_method(target_oop, | |
333 receiver_limit, decode_flags); | |
334 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); | |
335 init_MemberName(mname_oop, m, do_dispatch); | |
336 } | |
337 } | |
338 | |
339 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) { | |
340 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD) | |
341 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS )); | |
342 oop vmtarget = m; | |
343 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet | |
344 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound()) | |
345 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch | |
346 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value"); | |
347 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); | |
348 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); | |
349 sun_dyn_MemberName::set_flags(mname_oop, flags); | |
350 } | |
351 | |
352 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) { | |
353 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS )); | |
354 oop vmtarget = field_holder; | |
355 int vmindex = offset; // implies no info yet | |
356 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex"); | |
357 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); | |
358 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); | |
359 sun_dyn_MemberName::set_flags(mname_oop, flags); | |
360 } | |
361 | |
362 | |
363 methodOop MethodHandles::decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result) { | |
364 int flags = sun_dyn_MemberName::flags(mname); | |
365 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return NULL; // not invocable | |
366 oop vmtarget = sun_dyn_MemberName::vmtarget(mname); | |
367 int vmindex = sun_dyn_MemberName::vmindex(mname); | |
368 if (vmindex == VM_INDEX_UNINITIALIZED) return NULL; // not resolved | |
369 return decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result); | |
370 } | |
371 | |
372 // An unresolved member name is a mere symbolic reference. | |
373 // Resolving it plants a vmtarget/vmindex in it, | |
374 // which refers dirctly to JVM internals. | |
375 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) { | |
376 assert(sun_dyn_MemberName::is_instance(mname()), ""); | |
377 #ifdef ASSERT | |
378 // If this assert throws, renegotiate the sentinel value used by the Java code, | |
379 // so that it is distinct from any valid vtable index value, and any special | |
380 // values defined in methodOopDesc::VtableIndexFlag. | |
381 // The point of the slop is to give the Java code and the JVM some room | |
382 // to independently specify sentinel values. | |
383 const int sentinel_slop = 10; | |
384 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop; | |
385 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels"); | |
386 #endif | |
387 if (sun_dyn_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED) | |
388 return; // already resolved | |
389 oop defc_oop = sun_dyn_MemberName::clazz(mname()); | |
390 oop name_str = sun_dyn_MemberName::name(mname()); | |
391 oop type_str = sun_dyn_MemberName::type(mname()); | |
392 int flags = sun_dyn_MemberName::flags(mname()); | |
393 | |
394 if (defc_oop == NULL || name_str == NULL || type_str == NULL) { | |
395 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve"); | |
396 } | |
397 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop); | |
398 defc_oop = NULL; // safety | |
399 if (defc_klassOop == NULL) return; // a primitive; no resolution possible | |
400 if (!Klass::cast(defc_klassOop)->oop_is_instance()) { | |
401 if (!Klass::cast(defc_klassOop)->oop_is_array()) return; | |
402 defc_klassOop = SystemDictionary::object_klass(); | |
403 } | |
404 instanceKlassHandle defc(THREAD, defc_klassOop); | |
405 defc_klassOop = NULL; // safety | |
406 if (defc.is_null()) { | |
407 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class"); | |
408 } | |
409 defc->link_class(CHECK); | |
410 | |
411 // convert the external string name to an internal symbol | |
412 symbolHandle name(THREAD, java_lang_String::as_symbol_or_null(name_str)); | |
413 if (name.is_null()) return; // no such name | |
414 name_str = NULL; // safety | |
415 | |
416 // convert the external string or reflective type to an internal signature | |
417 bool force_signature = (name() == vmSymbols::invoke_name()); | |
418 symbolHandle type; { | |
419 symbolOop type_sym = NULL; | |
420 if (java_dyn_MethodType::is_instance(type_str)) { | |
421 type_sym = java_dyn_MethodType::as_signature(type_str, force_signature, CHECK); | |
422 } else if (java_lang_Class::is_instance(type_str)) { | |
423 type_sym = java_lang_Class::as_signature(type_str, force_signature, CHECK); | |
424 } else if (java_lang_String::is_instance(type_str)) { | |
425 if (force_signature) { | |
426 type = java_lang_String::as_symbol(type_str, CHECK); | |
427 } else { | |
428 type_sym = java_lang_String::as_symbol_or_null(type_str); | |
429 } | |
430 } else { | |
431 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized type"); | |
432 } | |
433 if (type_sym != NULL) | |
434 type = symbolHandle(THREAD, type_sym); | |
435 } | |
436 if (type.is_null()) return; // no such signature exists in the VM | |
437 type_str = NULL; // safety | |
438 | |
439 // Time to do the lookup. | |
440 switch (flags & ALL_KINDS) { | |
441 case IS_METHOD: | |
442 { | |
443 CallInfo result; | |
444 { | |
445 EXCEPTION_MARK; | |
446 if ((flags & JVM_ACC_STATIC) != 0) { | |
447 LinkResolver::resolve_static_call(result, | |
448 defc, name, type, KlassHandle(), false, false, THREAD); | |
449 } else if (defc->is_interface()) { | |
450 LinkResolver::resolve_interface_call(result, Handle(), defc, | |
451 defc, name, type, KlassHandle(), false, false, THREAD); | |
452 } else { | |
453 LinkResolver::resolve_virtual_call(result, Handle(), defc, | |
454 defc, name, type, KlassHandle(), false, false, THREAD); | |
455 } | |
456 if (HAS_PENDING_EXCEPTION) { | |
457 CLEAR_PENDING_EXCEPTION; | |
458 return; | |
459 } | |
460 } | |
461 methodHandle m = result.resolved_method(); | |
462 oop vmtarget = NULL; | |
463 int vmindex = methodOopDesc::nonvirtual_vtable_index; | |
464 if (defc->is_interface()) { | |
465 vmindex = klassItable::compute_itable_index(m()); | |
466 assert(vmindex >= 0, ""); | |
467 } else if (result.has_vtable_index()) { | |
468 vmindex = result.vtable_index(); | |
469 assert(vmindex >= 0, ""); | |
470 } | |
471 assert(vmindex != VM_INDEX_UNINITIALIZED, ""); | |
472 if (vmindex < 0) { | |
473 assert(result.is_statically_bound(), ""); | |
474 vmtarget = m(); | |
475 } else { | |
476 vmtarget = result.resolved_klass()->as_klassOop(); | |
477 } | |
478 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); | |
479 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
480 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
481 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
482 DEBUG_ONLY(int junk; klassOop junk2); | |
483 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), | |
484 "properly stored for later decoding"); | |
485 return; | |
486 } | |
487 case IS_CONSTRUCTOR: | |
488 { | |
489 CallInfo result; | |
490 { | |
491 EXCEPTION_MARK; | |
492 if (name() == vmSymbols::object_initializer_name()) { | |
493 LinkResolver::resolve_special_call(result, | |
494 defc, name, type, KlassHandle(), false, THREAD); | |
495 } else { | |
496 break; // will throw after end of switch | |
497 } | |
498 if (HAS_PENDING_EXCEPTION) { | |
499 CLEAR_PENDING_EXCEPTION; | |
500 return; | |
501 } | |
502 } | |
503 assert(result.is_statically_bound(), ""); | |
504 methodHandle m = result.resolved_method(); | |
505 oop vmtarget = m(); | |
506 int vmindex = methodOopDesc::nonvirtual_vtable_index; | |
507 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); | |
508 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
509 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
510 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
511 DEBUG_ONLY(int junk; klassOop junk2); | |
512 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), | |
513 "properly stored for later decoding"); | |
514 return; | |
515 } | |
516 case IS_FIELD: | |
517 { | |
518 // This is taken from LinkResolver::resolve_field, sans access checks. | |
519 fieldDescriptor fd; // find_field initializes fd if found | |
520 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name(), type(), &fd)); | |
521 // check if field exists; i.e., if a klass containing the field def has been selected | |
522 if (sel_klass.is_null()) return; | |
523 oop vmtarget = sel_klass->as_klassOop(); | |
524 int vmindex = fd.offset(); | |
525 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS); | |
526 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen | |
527 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
528 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
529 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
530 return; | |
531 } | |
532 } | |
533 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); | |
534 } | |
535 | |
536 // Conversely, a member name which is only initialized from JVM internals | |
537 // may have null defc, name, and type fields. | |
538 // Resolving it plants a vmtarget/vmindex in it, | |
539 // which refers directly to JVM internals. | |
540 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { | |
541 assert(sun_dyn_MemberName::is_instance(mname()), ""); | |
542 oop vmtarget = sun_dyn_MemberName::vmtarget(mname()); | |
543 int vmindex = sun_dyn_MemberName::vmindex(mname()); | |
544 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) { | |
545 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); | |
546 } | |
547 | |
548 bool have_defc = (sun_dyn_MemberName::clazz(mname()) != NULL); | |
549 bool have_name = (sun_dyn_MemberName::name(mname()) != NULL); | |
550 bool have_type = (sun_dyn_MemberName::type(mname()) != NULL); | |
551 int flags = sun_dyn_MemberName::flags(mname()); | |
552 | |
553 if (suppress != 0) { | |
554 if (suppress & _suppress_defc) have_defc = true; | |
555 if (suppress & _suppress_name) have_name = true; | |
556 if (suppress & _suppress_type) have_type = true; | |
557 } | |
558 | |
559 if (have_defc && have_name && have_type) return; // nothing needed | |
560 | |
561 switch (flags & ALL_KINDS) { | |
562 case IS_METHOD: | |
563 case IS_CONSTRUCTOR: | |
564 { | |
565 klassOop receiver_limit = NULL; | |
566 int decode_flags = 0; | |
567 methodHandle m(THREAD, decode_vmtarget(vmtarget, vmindex, NULL, | |
568 receiver_limit, decode_flags)); | |
569 if (m.is_null()) break; | |
570 if (!have_defc) { | |
571 klassOop defc = m->method_holder(); | |
572 if (receiver_limit != NULL && receiver_limit != defc | |
573 && Klass::cast(receiver_limit)->is_subtype_of(defc)) | |
574 defc = receiver_limit; | |
575 sun_dyn_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror()); | |
576 } | |
577 if (!have_name) { | |
578 //not java_lang_String::create_from_symbol; let's intern member names | |
579 Handle name = StringTable::intern(m->name(), CHECK); | |
580 sun_dyn_MemberName::set_name(mname(), name()); | |
581 } | |
582 if (!have_type) { | |
583 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); | |
584 sun_dyn_MemberName::set_type(mname(), type()); | |
585 } | |
586 return; | |
587 } | |
588 case IS_FIELD: | |
589 { | |
590 // This is taken from LinkResolver::resolve_field, sans access checks. | |
591 if (!vmtarget->is_klass()) break; | |
592 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break; | |
593 instanceKlassHandle defc(THREAD, (klassOop) vmtarget); | |
594 bool is_static = ((flags & JVM_ACC_STATIC) != 0); | |
595 fieldDescriptor fd; // find_field initializes fd if found | |
596 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) | |
597 break; // cannot expand | |
598 if (!have_defc) { | |
599 sun_dyn_MemberName::set_clazz(mname(), defc->java_mirror()); | |
600 } | |
601 if (!have_name) { | |
602 //not java_lang_String::create_from_symbol; let's intern member names | |
603 Handle name = StringTable::intern(fd.name(), CHECK); | |
604 sun_dyn_MemberName::set_name(mname(), name()); | |
605 } | |
606 if (!have_type) { | |
607 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK); | |
608 sun_dyn_MemberName::set_type(mname(), type()); | |
609 } | |
610 return; | |
611 } | |
612 } | |
613 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); | |
614 } | |
615 | |
616 int MethodHandles::find_MemberNames(klassOop k, | |
617 symbolOop name, symbolOop sig, | |
618 int mflags, klassOop caller, | |
619 int skip, objArrayOop results) { | |
620 DEBUG_ONLY(No_Safepoint_Verifier nsv); | |
621 // this code contains no safepoints! | |
622 | |
623 // %%% take caller into account! | |
624 | |
625 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1; | |
626 | |
627 int rfill = 0, rlimit = results->length(), rskip = skip; | |
628 // overflow measurement: | |
629 int overflow = 0, overflow_limit = MAX2(1000, rlimit); | |
630 | |
631 int match_flags = mflags; | |
632 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); | |
633 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); | |
634 bool local_only = !(search_superc | search_intfc); | |
635 bool classes_only = false; | |
636 | |
637 if (name != NULL) { | |
638 if (name->utf8_length() == 0) return 0; // a match is not possible | |
639 } | |
640 if (sig != NULL) { | |
641 if (sig->utf8_length() == 0) return 0; // a match is not possible | |
642 if (sig->byte_at(0) == '(') | |
643 match_flags &= ~(IS_FIELD | IS_TYPE); | |
644 else | |
645 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); | |
646 } | |
647 | |
648 if ((match_flags & IS_TYPE) != 0) { | |
649 // NYI, and Core Reflection works quite well for this query | |
650 } | |
651 | |
652 if ((match_flags & IS_FIELD) != 0) { | |
653 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { | |
654 if (name != NULL && st.name() != name) | |
655 continue; | |
656 if (sig != NULL && st.signature() != sig) | |
657 continue; | |
658 // passed the filters | |
659 if (rskip > 0) { | |
660 --rskip; | |
661 } else if (rfill < rlimit) { | |
662 oop result = results->obj_at(rfill++); | |
663 if (!sun_dyn_MemberName::is_instance(result)) | |
664 return -99; // caller bug! | |
665 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset()); | |
666 } else if (++overflow >= overflow_limit) { | |
667 match_flags = 0; break; // got tired of looking at overflow | |
668 } | |
669 } | |
670 } | |
671 | |
672 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { | |
673 // watch out for these guys: | |
674 symbolOop init_name = vmSymbols::object_initializer_name(); | |
675 symbolOop clinit_name = vmSymbols::class_initializer_name(); | |
676 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> | |
677 bool negate_name_test = false; | |
678 // fix name so that it captures the intention of IS_CONSTRUCTOR | |
679 if (!(match_flags & IS_METHOD)) { | |
680 // constructors only | |
681 if (name == NULL) { | |
682 name = init_name; | |
683 } else if (name != init_name) { | |
684 return 0; // no constructors of this method name | |
685 } | |
686 } else if (!(match_flags & IS_CONSTRUCTOR)) { | |
687 // methods only | |
688 if (name == NULL) { | |
689 name = init_name; | |
690 negate_name_test = true; // if we see the name, we *omit* the entry | |
691 } else if (name == init_name) { | |
692 return 0; // no methods of this constructor name | |
693 } | |
694 } else { | |
695 // caller will accept either sort; no need to adjust name | |
696 } | |
697 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { | |
698 methodOop m = st.method(); | |
699 symbolOop m_name = m->name(); | |
700 if (m_name == clinit_name) | |
701 continue; | |
702 if (name != NULL && ((m_name != name) ^ negate_name_test)) | |
703 continue; | |
704 if (sig != NULL && m->signature() != sig) | |
705 continue; | |
706 // passed the filters | |
707 if (rskip > 0) { | |
708 --rskip; | |
709 } else if (rfill < rlimit) { | |
710 oop result = results->obj_at(rfill++); | |
711 if (!sun_dyn_MemberName::is_instance(result)) | |
712 return -99; // caller bug! | |
713 MethodHandles::init_MemberName(result, m, true); | |
714 } else if (++overflow >= overflow_limit) { | |
715 match_flags = 0; break; // got tired of looking at overflow | |
716 } | |
717 } | |
718 } | |
719 | |
720 // return number of elements we at leasted wanted to initialize | |
721 return rfill + overflow; | |
722 } | |
723 | |
724 | |
725 | |
726 | |
727 // Decode the vmtarget field of a method handle. | |
728 // Sanitize out methodOops, klassOops, and any other non-Java data. | |
729 // This is for debugging and reflection. | |
730 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) { | |
731 assert(java_dyn_MethodHandle::is_instance(mh()), "must be a MH"); | |
732 if (format == ETF_HANDLE_OR_METHOD_NAME) { | |
733 oop target = java_dyn_MethodHandle::vmtarget(mh()); | |
734 if (target == NULL) { | |
735 return NULL; // unformed MH | |
736 } | |
737 klassOop tklass = target->klass(); | |
738 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::object_klass())) { | |
739 return target; // target is another MH (or something else?) | |
740 } | |
741 } | |
742 if (format == ETF_DIRECT_HANDLE) { | |
743 oop target = mh(); | |
744 for (;;) { | |
745 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { | |
746 return target; | |
747 } | |
748 if (!java_dyn_MethodHandle::is_instance(target)){ | |
749 return NULL; // unformed MH | |
750 } | |
751 target = java_dyn_MethodHandle::vmtarget(target); | |
752 } | |
753 } | |
754 // cases of metadata in MH.vmtarget: | |
755 // - AMH can have methodOop for static invoke with bound receiver | |
756 // - DMH can have methodOop for static invoke (on variable receiver) | |
757 // - DMH can have klassOop for dispatched (non-static) invoke | |
758 klassOop receiver_limit = NULL; | |
759 int decode_flags = 0; | |
760 methodOop m = decode_MethodHandle(mh(), receiver_limit, decode_flags); | |
761 if (m == NULL) return NULL; | |
762 switch (format) { | |
763 case ETF_REFLECT_METHOD: | |
764 // same as jni_ToReflectedMethod: | |
765 if (m->is_initializer()) { | |
766 return Reflection::new_constructor(m, THREAD); | |
767 } else { | |
768 return Reflection::new_method(m, UseNewReflection, false, THREAD); | |
769 } | |
770 | |
771 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle | |
772 case ETF_METHOD_NAME: | |
773 { | |
774 if (SystemDictionary::MemberName_klass() == NULL) break; | |
775 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass()); | |
776 mname_klass->initialize(CHECK_NULL); | |
777 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); | |
778 sun_dyn_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED); | |
779 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); | |
780 init_MemberName(mname(), m, do_dispatch); | |
781 expand_MemberName(mname, 0, CHECK_NULL); | |
782 return mname(); | |
783 } | |
784 } | |
785 | |
786 // Unknown format code. | |
787 char msg[50]; | |
788 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format); | |
789 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg); | |
790 } | |
791 | |
792 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) { | |
793 if (src == dst || dst == SystemDictionary::object_klass()) | |
794 return false; // quickest checks | |
795 Klass* srck = Klass::cast(src); | |
796 Klass* dstk = Klass::cast(dst); | |
797 if (dstk->is_interface()) { | |
798 // interface receivers can safely be viewed as untyped, | |
799 // because interface calls always include a dynamic check | |
800 //dstk = Klass::cast(SystemDictionary::object_klass()); | |
801 return false; | |
802 } | |
803 if (srck->is_interface()) { | |
804 // interface arguments must be viewed as untyped | |
805 //srck = Klass::cast(SystemDictionary::object_klass()); | |
806 return true; | |
807 } | |
808 return !srck->is_subclass_of(dstk->as_klassOop()); | |
809 } | |
810 | |
811 static oop object_java_mirror() { | |
812 return Klass::cast(SystemDictionary::object_klass())->java_mirror(); | |
813 } | |
814 | |
815 bool MethodHandles::same_basic_type_for_arguments(BasicType src, | |
816 BasicType dst, | |
817 bool for_return) { | |
818 // return values can always be forgotten: | |
819 if (for_return && dst == T_VOID) return true; | |
820 assert(src != T_VOID && dst != T_VOID, "should not be here"); | |
821 if (src == dst) return true; | |
822 if (type2size[src] != type2size[dst]) return false; | |
823 // allow reinterpretation casts for integral widening | |
824 if (is_subword_type(src)) { // subwords can fit in int or other subwords | |
825 if (dst == T_INT) // any subword fits in an int | |
826 return true; | |
827 if (src == T_BOOLEAN) // boolean fits in any subword | |
828 return is_subword_type(dst); | |
829 if (src == T_BYTE && dst == T_SHORT) | |
830 return true; // remaining case: byte fits in short | |
831 } | |
832 // allow float/fixed reinterpretation casts | |
833 if (src == T_FLOAT) return dst == T_INT; | |
834 if (src == T_INT) return dst == T_FLOAT; | |
835 if (src == T_DOUBLE) return dst == T_LONG; | |
836 if (src == T_LONG) return dst == T_DOUBLE; | |
837 return false; | |
838 } | |
839 | |
840 const char* MethodHandles::check_method_receiver(methodOop m, | |
841 klassOop passed_recv_type) { | |
842 assert(!m->is_static(), "caller resp."); | |
843 if (passed_recv_type == NULL) | |
844 return "receiver type is primitive"; | |
845 if (class_cast_needed(passed_recv_type, m->method_holder())) { | |
846 Klass* formal = Klass::cast(m->method_holder()); | |
847 return SharedRuntime::generate_class_cast_message("receiver type", | |
848 formal->external_name()); | |
849 } | |
850 return NULL; // checks passed | |
851 } | |
852 | |
853 // Verify that m's signature can be called type-safely by a method handle | |
854 // of the given method type 'mtype'. | |
855 // It takes a TRAPS argument because it must perform symbol lookups. | |
856 void MethodHandles::verify_method_signature(methodHandle m, | |
857 Handle mtype, | |
858 int first_ptype_pos, | |
859 KlassHandle insert_ptype, | |
860 TRAPS) { | |
861 objArrayHandle ptypes(THREAD, java_dyn_MethodType::ptypes(mtype())); | |
862 int pnum = first_ptype_pos; | |
863 int pmax = ptypes->length(); | |
864 int mnum = 0; // method argument | |
865 const char* err = NULL; | |
866 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) { | |
867 oop ptype_oop = NULL; | |
868 if (ss.at_return_type()) { | |
869 if (pnum != pmax) | |
870 { err = "too many arguments"; break; } | |
871 ptype_oop = java_dyn_MethodType::rtype(mtype()); | |
872 } else { | |
873 if (pnum >= pmax) | |
874 { err = "not enough arguments"; break; } | |
875 if (pnum >= 0) | |
876 ptype_oop = ptypes->obj_at(pnum); | |
877 else if (insert_ptype.is_null()) | |
878 ptype_oop = NULL; | |
879 else | |
880 ptype_oop = insert_ptype->java_mirror(); | |
881 pnum += 1; | |
882 mnum += 1; | |
883 } | |
884 klassOop mklass = NULL; | |
885 BasicType mtype = ss.type(); | |
886 if (mtype == T_ARRAY) mtype = T_OBJECT; // fold all refs to T_OBJECT | |
887 if (mtype == T_OBJECT) { | |
888 if (ptype_oop == NULL) { | |
889 // null matches any reference | |
890 continue; | |
891 } | |
892 // If we fail to resolve types at this point, we will throw an error. | |
893 symbolOop name_oop = ss.as_symbol(CHECK); | |
894 symbolHandle name(THREAD, name_oop); | |
895 instanceKlass* mk = instanceKlass::cast(m->method_holder()); | |
896 Handle loader(THREAD, mk->class_loader()); | |
897 Handle domain(THREAD, mk->protection_domain()); | |
898 mklass = SystemDictionary::resolve_or_fail(name, loader, domain, | |
899 true, CHECK); | |
900 } | |
901 if (ptype_oop == NULL) { | |
902 // null does not match any non-reference; use Object to report the error | |
903 ptype_oop = object_java_mirror(); | |
904 } | |
905 klassOop pklass = NULL; | |
906 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass); | |
907 if (!ss.at_return_type()) { | |
908 err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum); | |
909 } else { | |
910 err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal! | |
911 } | |
912 if (err != NULL) break; | |
913 } | |
914 | |
915 if (err != NULL) { | |
916 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
917 } | |
918 } | |
919 | |
920 // Main routine for verifying the MethodHandle.type of a proposed | |
921 // direct or bound-direct method handle. | |
922 void MethodHandles::verify_method_type(methodHandle m, | |
923 Handle mtype, | |
924 bool has_bound_recv, | |
925 KlassHandle bound_recv_type, | |
926 TRAPS) { | |
927 bool m_needs_receiver = !m->is_static(); | |
928 | |
929 const char* err = NULL; | |
930 | |
931 int first_ptype_pos = m_needs_receiver ? 1 : 0; | |
932 if (has_bound_recv && err == NULL) { | |
933 first_ptype_pos -= 1; | |
934 if (m_needs_receiver && bound_recv_type.is_null()) | |
935 { err = "bound receiver is not an object"; goto die; } | |
936 } | |
937 | |
938 if (m_needs_receiver && err == NULL) { | |
939 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype()); | |
940 if (ptypes->length() < first_ptype_pos) | |
941 { err = "receiver argument is missing"; goto die; } | |
942 if (first_ptype_pos == -1) | |
943 err = check_method_receiver(m(), bound_recv_type->as_klassOop()); | |
944 else | |
945 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(0))); | |
946 if (err != NULL) goto die; | |
947 } | |
948 | |
949 // Check the other arguments for mistypes. | |
950 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK); | |
951 return; | |
952 | |
953 die: | |
954 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
955 } | |
956 | |
957 void MethodHandles::verify_vmslots(Handle mh, TRAPS) { | |
958 // Verify vmslots. | |
959 int check_slots = argument_slot_count(java_dyn_MethodHandle::type(mh())); | |
960 if (java_dyn_MethodHandle::vmslots(mh()) != check_slots) { | |
961 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH"); | |
962 } | |
963 } | |
964 | |
965 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) { | |
966 // Verify that argslot points at the given argnum. | |
967 int check_slot = argument_slot(java_dyn_MethodHandle::type(mh()), argnum); | |
968 if (argslot != check_slot || argslot < 0) { | |
969 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d"; | |
970 size_t msglen = strlen(fmt) + 3*11 + 1; | |
971 char* msg = NEW_RESOURCE_ARRAY(char, msglen); | |
972 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot); | |
973 THROW_MSG(vmSymbols::java_lang_InternalError(), msg); | |
974 } | |
975 } | |
976 | |
977 // Verify the correspondence between two method types. | |
978 // Apart from the advertised changes, caller method type X must | |
979 // be able to invoke the callee method Y type with no violations | |
980 // of type integrity. | |
981 // Return NULL if all is well, else a short error message. | |
982 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end, | |
983 int insert_argnum, oop insert_type, | |
984 int change_argnum, oop change_type, | |
985 int delete_argnum, | |
986 oop dst_mtype, int dst_beg, int dst_end) { | |
987 objArrayOop src_ptypes = java_dyn_MethodType::ptypes(src_mtype); | |
988 objArrayOop dst_ptypes = java_dyn_MethodType::ptypes(dst_mtype); | |
989 | |
990 int src_max = src_ptypes->length(); | |
991 int dst_max = dst_ptypes->length(); | |
992 | |
993 if (src_end == -1) src_end = src_max; | |
994 if (dst_end == -1) dst_end = dst_max; | |
995 | |
996 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob"); | |
997 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob"); | |
998 | |
999 // pending actions; set to -1 when done: | |
1000 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum; | |
1001 | |
1002 const char* err = NULL; | |
1003 | |
1004 // Walk along each array of parameter types, including a virtual | |
1005 // NULL end marker at the end of each. | |
1006 for (int src_idx = src_beg, dst_idx = dst_beg; | |
1007 (src_idx <= src_end && dst_idx <= dst_end); | |
1008 src_idx++, dst_idx++) { | |
1009 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx); | |
1010 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx); | |
1011 bool fix_null_src_type = false; | |
1012 | |
1013 // Perform requested edits. | |
1014 if (ins_idx == src_idx) { | |
1015 // note that the inserted guy is never affected by a change or deletion | |
1016 ins_idx = -1; | |
1017 src_type = insert_type; | |
1018 fix_null_src_type = true; | |
1019 --src_idx; // back up to process src type on next loop | |
1020 src_idx = src_end; | |
1021 } else { | |
1022 // note that the changed guy can be immediately deleted | |
1023 if (chg_idx == src_idx) { | |
1024 chg_idx = -1; | |
1025 assert(src_idx < src_end, "oob"); | |
1026 src_type = change_type; | |
1027 fix_null_src_type = true; | |
1028 } | |
1029 if (del_idx == src_idx) { | |
1030 del_idx = -1; | |
1031 assert(src_idx < src_end, "oob"); | |
1032 --dst_idx; | |
1033 continue; // rerun loop after skipping this position | |
1034 } | |
1035 } | |
1036 | |
1037 if (src_type == NULL && fix_null_src_type) | |
1038 // explicit null in this case matches any dest reference | |
1039 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type); | |
1040 | |
1041 // Compare the two argument types. | |
1042 if (src_type != dst_type) { | |
1043 if (src_type == NULL) return "not enough arguments"; | |
1044 if (dst_type == NULL) return "too many arguments"; | |
1045 err = check_argument_type_change(src_type, dst_type, dst_idx); | |
1046 if (err != NULL) return err; | |
1047 } | |
1048 } | |
1049 | |
1050 // Now compare return types also. | |
1051 oop src_rtype = java_dyn_MethodType::rtype(src_mtype); | |
1052 oop dst_rtype = java_dyn_MethodType::rtype(dst_mtype); | |
1053 if (src_rtype != dst_rtype) { | |
1054 err = check_return_type_change(dst_rtype, src_rtype); // note reversal! | |
1055 if (err != NULL) return err; | |
1056 } | |
1057 | |
1058 assert(err == NULL, ""); | |
1059 return NULL; // all is well | |
1060 } | |
1061 | |
1062 | |
1063 const char* MethodHandles::check_argument_type_change(BasicType src_type, | |
1064 klassOop src_klass, | |
1065 BasicType dst_type, | |
1066 klassOop dst_klass, | |
1067 int argnum) { | |
1068 const char* err = NULL; | |
1069 | |
1070 // just in case: | |
1071 if (src_type == T_ARRAY) src_type = T_OBJECT; | |
1072 if (dst_type == T_ARRAY) dst_type = T_OBJECT; | |
1073 | |
1074 // Produce some nice messages if VerifyMethodHandles is turned on: | |
1075 if (!same_basic_type_for_arguments(src_type, dst_type, (argnum < 0))) { | |
1076 if (src_type == T_OBJECT) { | |
1077 err = ((argnum >= 0) | |
1078 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s" | |
1079 : "type mismatch: returning a %s, but caller expects primitive %s"); | |
1080 } else if (dst_type == T_OBJECT) { | |
1081 err = ((argnum < 0) | |
1082 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s" | |
1083 : "type mismatch: returning a primitive %s, but caller expects %s"); | |
1084 } else { | |
1085 err = ((argnum < 0) | |
1086 ? "type mismatch: passing a %s for method argument #%d, which expects %s" | |
1087 : "type mismatch: returning a %s, but caller expects %s"); | |
1088 } | |
1089 } else if (src_type == T_OBJECT && class_cast_needed(src_klass, dst_klass)) { | |
1090 if (!class_cast_needed(dst_klass, src_klass)) { | |
1091 err = ((argnum < 0) | |
1092 ? "cast required: passing a %s for method argument #%d, which expects %s" | |
1093 : "cast required: returning a %s, but caller expects %s"); | |
1094 } else { | |
1095 err = ((argnum < 0) | |
1096 ? "reference mismatch: passing a %s for method argument #%d, which expects %s" | |
1097 : "reference mismatch: returning a %s, but caller expects %s"); | |
1098 } | |
1099 } else { | |
1100 // passed the obstacle course | |
1101 return NULL; | |
1102 } | |
1103 | |
1104 // format, format, format | |
1105 const char* src_name = type2name(src_type); | |
1106 const char* dst_name = type2name(dst_type); | |
1107 if (src_type == T_OBJECT) src_name = Klass::cast(src_klass)->external_name(); | |
1108 if (dst_type == T_OBJECT) dst_name = Klass::cast(dst_klass)->external_name(); | |
1109 if (src_name == NULL) src_name = "unknown type"; | |
1110 if (dst_name == NULL) dst_name = "unknown type"; | |
1111 | |
1112 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11); | |
1113 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1); | |
1114 if (argnum >= 0) { | |
1115 assert(strstr(err, "%d") != NULL, ""); | |
1116 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name); | |
1117 } else { | |
1118 assert(strstr(err, "%d") == NULL, ""); | |
1119 jio_snprintf(msg, msglen, err, src_name, dst_name); | |
1120 } | |
1121 return msg; | |
1122 } | |
1123 | |
1124 // Compute the depth within the stack of the given argument, i.e., | |
1125 // the combined size of arguments to the right of the given argument. | |
1126 // For the last argument (ptypes.length-1) this will be zero. | |
1127 // For the first argument (0) this will be the size of all | |
1128 // arguments but that one. For the special number -1, this | |
1129 // will be the size of all arguments, including the first. | |
1130 // If the argument is neither -1 nor a valid argument index, | |
1131 // then return a negative number. Otherwise, the result | |
1132 // is in the range [0..vmslots] inclusive. | |
1133 int MethodHandles::argument_slot(oop method_type, int arg) { | |
1134 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); | |
1135 int argslot = 0; | |
1136 int len = ptypes->length(); | |
1137 if (arg < -1 || arg >= len) return -99; | |
1138 for (int i = len-1; i > arg; i--) { | |
1139 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); | |
1140 argslot += type2size[bt]; | |
1141 } | |
1142 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works"); | |
1143 return argslot; | |
1144 } | |
1145 | |
1146 // Given a slot number, return the argument number. | |
1147 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) { | |
1148 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); | |
1149 int argslot = 0; | |
1150 int len = ptypes->length(); | |
1151 for (int i = len-1; i >= 0; i--) { | |
1152 if (query_argslot == argslot) return i; | |
1153 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); | |
1154 argslot += type2size[bt]; | |
1155 } | |
1156 // return pseudo-arg deepest in stack: | |
1157 if (query_argslot == argslot) return -1; | |
1158 return -99; // oob slot, or splitting a double-slot arg | |
1159 } | |
1160 | |
1161 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m, | |
1162 KlassHandle receiver_limit, | |
1163 int decode_flags, | |
1164 KlassHandle receiver_klass, | |
1165 TRAPS) { | |
1166 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference"); | |
1167 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument"); | |
1168 | |
1169 if (!m->is_static() && | |
1170 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder()))) | |
1171 // given type does not match class of method, or receiver is null! | |
1172 // caller should have checked this, but let's be extra careful... | |
1173 return methodHandle(); | |
1174 | |
1175 if (receiver_limit.not_null() && | |
1176 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit()))) | |
1177 // given type is not limited to the receiver type | |
1178 // note that a null receiver can match any reference value, for a static method | |
1179 return methodHandle(); | |
1180 | |
1181 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) { | |
1182 // pre-dispatched or static method (null receiver is OK for static) | |
1183 return m; | |
1184 | |
1185 } else if (receiver_klass.is_null()) { | |
1186 // null receiver value; cannot dispatch | |
1187 return methodHandle(); | |
1188 | |
1189 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) { | |
1190 // perform virtual dispatch | |
1191 int vtable_index = m->vtable_index(); | |
1192 guarantee(vtable_index >= 0, "valid vtable index"); | |
1193 | |
1194 // receiver_klass might be an arrayKlassOop but all vtables start at | |
1195 // the same place. The cast is to avoid virtual call and assertion. | |
1196 // See also LinkResolver::runtime_resolve_virtual_method. | |
1197 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass()); | |
1198 DEBUG_ONLY(inst->verify_vtable_index(vtable_index)); | |
1199 methodOop m_oop = inst->method_at_vtable(vtable_index); | |
1200 return methodHandle(THREAD, m_oop); | |
1201 | |
1202 } else { | |
1203 // perform interface dispatch | |
1204 int itable_index = klassItable::compute_itable_index(m()); | |
1205 guarantee(itable_index >= 0, "valid itable index"); | |
1206 instanceKlass* inst = instanceKlass::cast(receiver_klass()); | |
1207 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD); | |
1208 return methodHandle(THREAD, m_oop); | |
1209 } | |
1210 } | |
1211 | |
1212 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) { | |
1213 // Verify type. | |
1214 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1215 verify_method_type(m, mtype, false, KlassHandle(), CHECK); | |
1216 | |
1217 // Verify vmslots. | |
1218 if (java_dyn_MethodHandle::vmslots(mh()) != m->size_of_parameters()) { | |
1219 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH"); | |
1220 } | |
1221 } | |
1222 | |
1223 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) { | |
1224 // Check arguments. | |
1225 if (mh.is_null() || m.is_null() || | |
1226 (!do_dispatch && m->is_abstract())) { | |
1227 THROW(vmSymbols::java_lang_InternalError()); | |
1228 } | |
1229 | |
1230 java_dyn_MethodHandle::init_vmslots(mh()); | |
1231 | |
1232 if (VerifyMethodHandles) { | |
1233 // The privileged code which invokes this routine should not make | |
1234 // a mistake about types, but it's better to verify. | |
1235 verify_DirectMethodHandle(mh, m, CHECK); | |
1236 } | |
1237 | |
1238 // Finally, after safety checks are done, link to the target method. | |
1239 // We will follow the same path as the latter part of | |
1240 // InterpreterRuntime::resolve_invoke(), which first finds the method | |
1241 // and then decides how to populate the constant pool cache entry | |
1242 // that links the interpreter calls to the method. We need the same | |
1243 // bits, and will use the same calling sequence code. | |
1244 | |
1245 int vmindex = methodOopDesc::garbage_vtable_index; | |
1246 oop vmtarget = NULL; | |
1247 | |
1248 instanceKlass::cast(m->method_holder())->link_class(CHECK); | |
1249 | |
1250 MethodHandleEntry* me = NULL; | |
1251 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) { | |
1252 // We are simulating an invokeinterface instruction. | |
1253 // (We might also be simulating an invokevirtual on a miranda method, | |
1254 // but it is safe to treat it as an invokeinterface.) | |
1255 assert(!m->can_be_statically_bound(), "no final methods on interfaces"); | |
1256 vmindex = klassItable::compute_itable_index(m()); | |
1257 assert(vmindex >= 0, "(>=0) == do_dispatch"); | |
1258 // Set up same bits as ConstantPoolCacheEntry::set_interface_call(). | |
1259 vmtarget = m->method_holder(); // the interface | |
1260 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh); | |
1261 } else if (!do_dispatch || m->can_be_statically_bound()) { | |
1262 // We are simulating an invokestatic or invokespecial instruction. | |
1263 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method(). | |
1264 vmtarget = m(); | |
1265 // this does not help dispatch, but it will make it possible to parse this MH: | |
1266 vmindex = methodOopDesc::nonvirtual_vtable_index; | |
1267 assert(vmindex < 0, "(>=0) == do_dispatch"); | |
1268 if (!m->is_static()) { | |
1269 me = MethodHandles::entry(MethodHandles::_invokespecial_mh); | |
1270 } else { | |
1271 me = MethodHandles::entry(MethodHandles::_invokestatic_mh); | |
1272 // Part of the semantics of a static call is an initialization barrier. | |
1273 // For a DMH, it is done now, when the handle is created. | |
1274 Klass* k = Klass::cast(m->method_holder()); | |
1275 if (k->should_be_initialized()) { | |
1276 k->initialize(CHECK); | |
1277 } | |
1278 } | |
1279 } else { | |
1280 // We are simulating an invokevirtual instruction. | |
1281 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method(). | |
1282 // The key logic is LinkResolver::runtime_resolve_virtual_method. | |
1283 vmindex = m->vtable_index(); | |
1284 vmtarget = m->method_holder(); | |
1285 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh); | |
1286 } | |
1287 | |
1288 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
1289 | |
1290 sun_dyn_DirectMethodHandle::set_vmtarget(mh(), vmtarget); | |
1291 sun_dyn_DirectMethodHandle::set_vmindex(mh(), vmindex); | |
1292 DEBUG_ONLY(int flags; klassOop rlimit); | |
1293 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(), | |
1294 "properly stored for later decoding"); | |
1295 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0)); | |
1296 assert(!(actual_do_dispatch && !do_dispatch), | |
1297 "do not perform dispatch if !do_dispatch specified"); | |
1298 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch"); | |
1299 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack"); | |
1300 | |
1301 // Done! | |
1302 java_dyn_MethodHandle::set_vmentry(mh(), me); | |
1303 } | |
1304 | |
1305 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh, | |
1306 methodHandle m, | |
1307 TRAPS) { | |
1308 // Verify type. | |
1309 oop receiver = sun_dyn_BoundMethodHandle::argument(mh()); | |
1310 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1311 KlassHandle bound_recv_type; | |
1312 if (receiver != NULL) bound_recv_type = KlassHandle(THREAD, receiver->klass()); | |
1313 verify_method_type(m, mtype, true, bound_recv_type, CHECK); | |
1314 | |
1315 int receiver_pos = m->size_of_parameters() - 1; | |
1316 | |
1317 // Verify MH.vmargslot, which should point at the bound receiver. | |
1318 verify_vmargslot(mh, -1, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); | |
1319 //verify_vmslots(mh, CHECK); | |
1320 | |
1321 // Verify vmslots. | |
1322 if (java_dyn_MethodHandle::vmslots(mh()) != receiver_pos) { | |
1323 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)"); | |
1324 } | |
1325 } | |
1326 | |
1327 // Initialize a BMH with a receiver bound directly to a methodOop. | |
1328 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh, | |
1329 methodHandle original_m, | |
1330 KlassHandle receiver_limit, | |
1331 int decode_flags, | |
1332 TRAPS) { | |
1333 // Check arguments. | |
1334 if (mh.is_null() || original_m.is_null()) { | |
1335 THROW(vmSymbols::java_lang_InternalError()); | |
1336 } | |
1337 | |
1338 KlassHandle receiver_klass; | |
1339 { | |
1340 oop receiver_oop = sun_dyn_BoundMethodHandle::argument(mh()); | |
1341 if (receiver_oop != NULL) | |
1342 receiver_klass = KlassHandle(THREAD, receiver_oop->klass()); | |
1343 } | |
1344 methodHandle m = dispatch_decoded_method(original_m, | |
1345 receiver_limit, decode_flags, | |
1346 receiver_klass, | |
1347 CHECK); | |
1348 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); } | |
1349 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); } | |
1350 | |
1351 java_dyn_MethodHandle::init_vmslots(mh()); | |
1352 | |
1353 if (VerifyMethodHandles) { | |
1354 verify_BoundMethodHandle_with_receiver(mh, m, CHECK); | |
1355 } | |
1356 | |
1357 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); | |
1358 | |
1359 DEBUG_ONLY(int junk; klassOop junk2); | |
1360 assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding"); | |
1361 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot"); | |
1362 | |
1363 // Done! | |
1364 java_dyn_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh)); | |
1365 } | |
1366 | |
1367 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum, | |
1368 bool direct_to_method, TRAPS) { | |
1369 Handle ptype_handle(THREAD, | |
1370 java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum)); | |
1371 KlassHandle ptype_klass; | |
1372 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass); | |
1373 int slots_pushed = type2size[ptype]; | |
1374 | |
1375 oop argument = sun_dyn_BoundMethodHandle::argument(mh()); | |
1376 | |
1377 const char* err = NULL; | |
1378 | |
1379 switch (ptype) { | |
1380 case T_OBJECT: | |
1381 if (argument != NULL) | |
1382 // we must implicitly convert from the arg type to the outgoing ptype | |
1383 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum); | |
1384 break; | |
1385 | |
1386 case T_ARRAY: case T_VOID: | |
1387 assert(false, "array, void do not appear here"); | |
1388 default: | |
1389 if (ptype != T_INT && !is_subword_type(ptype)) { | |
1390 err = "unexpected parameter type"; | |
1391 break; | |
1392 } | |
1393 // check subrange of Integer.value, if necessary | |
1394 if (argument == NULL || argument->klass() != SystemDictionary::int_klass()) { | |
1395 err = "bound integer argument must be of type java.lang.Integer"; | |
1396 break; | |
1397 } | |
1398 if (ptype != T_INT) { | |
1399 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT); | |
1400 jint value = argument->int_field(value_offset); | |
1401 int vminfo = adapter_subword_vminfo(ptype); | |
1402 jint subword = truncate_subword_from_vminfo(value, vminfo); | |
1403 if (value != subword) { | |
1404 err = "bound subword value does not fit into the subword type"; | |
1405 break; | |
1406 } | |
1407 } | |
1408 break; | |
1409 case T_FLOAT: | |
1410 case T_DOUBLE: | |
1411 case T_LONG: | |
1412 { | |
1413 // we must implicitly convert from the unboxed arg type to the outgoing ptype | |
1414 BasicType argbox = java_lang_boxing_object::basic_type(argument); | |
1415 if (argbox != ptype) { | |
1416 err = check_argument_type_change(T_OBJECT, (argument == NULL | |
1417 ? SystemDictionary::object_klass() | |
1418 : argument->klass()), | |
1419 ptype, ptype_klass(), argnum); | |
1420 assert(err != NULL, "this must be an error"); | |
1421 } | |
1422 break; | |
1423 } | |
1424 } | |
1425 | |
1426 if (err == NULL) { | |
1427 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); | |
1428 if (direct_to_method) { | |
1429 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots"); | |
1430 assert(slots_pushed <= MethodHandlePushLimit, ""); | |
1431 } else { | |
1432 int prev_pushes = decode_MethodHandle_stack_pushes(target()); | |
1433 assert(this_pushes == slots_pushed + prev_pushes, "BMH stack motion must be correct"); | |
1434 // do not blow the stack; use a Java-based adapter if this limit is exceeded | |
1435 if (slots_pushed + prev_pushes > MethodHandlePushLimit) | |
1436 err = "too many bound parameters"; | |
1437 } | |
1438 } | |
1439 | |
1440 if (err == NULL) { | |
1441 // Verify the rest of the method type. | |
1442 err = check_method_type_insertion(java_dyn_MethodHandle::type(mh()), | |
1443 argnum, ptype_handle(), | |
1444 java_dyn_MethodHandle::type(target())); | |
1445 } | |
1446 | |
1447 if (err != NULL) { | |
1448 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
1449 } | |
1450 } | |
1451 | |
1452 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { | |
1453 // Check arguments. | |
1454 if (mh.is_null() || target.is_null() || !java_dyn_MethodHandle::is_instance(target())) { | |
1455 THROW(vmSymbols::java_lang_InternalError()); | |
1456 } | |
1457 | |
1458 java_dyn_MethodHandle::init_vmslots(mh()); | |
1459 | |
1460 if (VerifyMethodHandles) { | |
1461 int insert_after = argnum - 1; | |
1462 verify_vmargslot(mh, insert_after, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); | |
1463 verify_vmslots(mh, CHECK); | |
1464 } | |
1465 | |
1466 // If (a) the target is a direct non-dispatched method handle, | |
1467 // or (b) the target is a dispatched direct method handle and we | |
1468 // are binding the receiver, cut out the middle-man. | |
1469 // Do this by decoding the DMH and using its methodOop directly as vmtarget. | |
1470 bool direct_to_method = false; | |
1471 if (OptimizeMethodHandles && | |
1472 target->klass() == SystemDictionary::DirectMethodHandle_klass() && | |
1473 (argnum == 0 || sun_dyn_DirectMethodHandle::vmindex(target()) < 0)) { | |
1474 int decode_flags = 0; klassOop receiver_limit_oop = NULL; | |
1475 methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags)); | |
1476 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); } | |
1477 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - 1); // pos. of 1st arg. | |
1478 assert(sun_dyn_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig"); | |
1479 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) { | |
1480 KlassHandle receiver_limit(THREAD, receiver_limit_oop); | |
1481 init_BoundMethodHandle_with_receiver(mh, m, | |
1482 receiver_limit, decode_flags, | |
1483 CHECK); | |
1484 return; | |
1485 } | |
1486 | |
1487 // Even if it is not a bound receiver, we still might be able | |
1488 // to bind another argument and still invoke the methodOop directly. | |
1489 if (!(decode_flags & _dmf_does_dispatch)) { | |
1490 direct_to_method = true; | |
1491 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); | |
1492 } | |
1493 } | |
1494 if (!direct_to_method) | |
1495 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), target()); | |
1496 | |
1497 if (VerifyMethodHandles) { | |
1498 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK); | |
1499 } | |
1500 | |
1501 // Next question: Is this a ref, int, or long bound value? | |
1502 oop ptype_oop = java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum); | |
1503 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop); | |
1504 int slots_pushed = type2size[ptype]; | |
1505 | |
1506 MethodHandleEntry* me = NULL; | |
1507 if (ptype == T_OBJECT) { | |
1508 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh); | |
1509 else me = MethodHandles::entry(_bound_ref_mh); | |
1510 } else if (slots_pushed == 2) { | |
1511 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh); | |
1512 else me = MethodHandles::entry(_bound_long_mh); | |
1513 } else if (slots_pushed == 1) { | |
1514 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh); | |
1515 else me = MethodHandles::entry(_bound_int_mh); | |
1516 } else { | |
1517 assert(false, ""); | |
1518 } | |
1519 | |
1520 // Done! | |
1521 java_dyn_MethodHandle::set_vmentry(mh(), me); | |
1522 } | |
1523 | |
1524 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) { | |
1525 char msg[200]; | |
1526 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err); | |
1527 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg); | |
1528 } | |
1529 | |
1530 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) { | |
1531 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); | |
1532 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); | |
1533 | |
1534 verify_vmargslot(mh, argnum, argslot, CHECK); | |
1535 verify_vmslots(mh, CHECK); | |
1536 | |
1537 jint conv_op = adapter_conversion_op(conversion); | |
1538 if (!conv_op_valid(conv_op)) { | |
1539 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD); | |
1540 return; | |
1541 } | |
1542 EntryKind ek = adapter_entry_kind(conv_op); | |
1543 | |
1544 int stack_move = adapter_conversion_stack_move(conversion); | |
1545 BasicType src = adapter_conversion_src_type(conversion); | |
1546 BasicType dest = adapter_conversion_dest_type(conversion); | |
1547 int vminfo = adapter_conversion_vminfo(conversion); // should be zero | |
1548 | |
1549 Handle argument(THREAD, sun_dyn_AdapterMethodHandle::argument(mh())); | |
1550 Handle target(THREAD, sun_dyn_AdapterMethodHandle::vmtarget(mh())); | |
1551 Handle src_mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1552 Handle dst_mtype(THREAD, java_dyn_MethodHandle::type(target())); | |
1553 | |
1554 const char* err = NULL; | |
1555 | |
1556 if (err == NULL) { | |
1557 // Check that the correct argument is supplied, but only if it is required. | |
1558 switch (ek) { | |
1559 case _adapter_check_cast: // target type of cast | |
1560 case _adapter_ref_to_prim: // wrapper type from which to unbox | |
1561 case _adapter_prim_to_ref: // wrapper type to box into | |
1562 case _adapter_collect_args: // array type to collect into | |
1563 case _adapter_spread_args: // array type to spread from | |
1564 if (!java_lang_Class::is_instance(argument()) | |
1565 || java_lang_Class::is_primitive(argument())) | |
1566 { err = "adapter requires argument of type java.lang.Class"; break; } | |
1567 if (ek == _adapter_collect_args || | |
1568 ek == _adapter_spread_args) { | |
1569 // Make sure it is a suitable collection type. (Array, for now.) | |
1570 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument())); | |
1571 if (!ak->oop_is_objArray()) { | |
1572 { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; } | |
1573 } | |
1574 } | |
1575 break; | |
1576 case _adapter_flyby: | |
1577 case _adapter_ricochet: | |
1578 if (!java_dyn_MethodHandle::is_instance(argument())) | |
1579 { err = "MethodHandle adapter argument required"; break; } | |
1580 break; | |
1581 default: | |
1582 if (argument.not_null()) | |
1583 { err = "adapter has spurious argument"; break; } | |
1584 break; | |
1585 } | |
1586 } | |
1587 | |
1588 if (err == NULL) { | |
1589 // Check that the src/dest types are supplied if needed. | |
1590 switch (ek) { | |
1591 case _adapter_prim_to_prim: | |
1592 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) { | |
1593 err = "adapter requires primitive src/dest conversion subfields"; break; | |
1594 } | |
1595 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) || | |
1596 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) { | |
1597 err = "adapter cannot convert beween floating and fixed-point"; break; | |
1598 } | |
1599 break; | |
1600 case _adapter_ref_to_prim: | |
1601 if (src != T_OBJECT || !is_java_primitive(dest) | |
1602 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) { | |
1603 err = "adapter requires primitive dest conversion subfield"; break; | |
1604 } | |
1605 break; | |
1606 case _adapter_prim_to_ref: | |
1607 if (!is_java_primitive(src) || dest != T_OBJECT | |
1608 || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) { | |
1609 err = "adapter requires primitive src conversion subfield"; break; | |
1610 } | |
1611 break; | |
1612 case _adapter_swap_args: | |
1613 case _adapter_rot_args: | |
1614 { | |
1615 if (!src || src != dest) { | |
1616 err = "adapter requires src/dest conversion subfields for swap"; break; | |
1617 } | |
1618 int swap_size = type2size[src]; | |
1619 oop src_mtype = sun_dyn_AdapterMethodHandle::type(target()); | |
1620 oop dest_mtype = sun_dyn_AdapterMethodHandle::type(mh()); | |
1621 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(src_mtype); | |
1622 int src_slot = argslot; | |
1623 int dest_slot = vminfo; | |
1624 bool rotate_up = (src_slot > dest_slot); // upward rotation | |
1625 int src_arg = argnum; | |
1626 int dest_arg = argument_slot_to_argnum(dest_mtype, dest_slot); | |
1627 verify_vmargslot(mh, dest_arg, dest_slot, CHECK); | |
1628 if (!(dest_slot >= src_slot + swap_size) && | |
1629 !(src_slot >= dest_slot + swap_size)) { | |
1630 err = "source, destination slots must be distinct"; | |
1631 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) { | |
1632 err = "source of swap must be deeper in stack"; | |
1633 } else if (ek == _adapter_swap_args) { | |
1634 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, dest_arg), | |
1635 java_dyn_MethodType::ptype(dest_mtype, src_arg), | |
1636 dest_arg); | |
1637 } else if (ek == _adapter_rot_args) { | |
1638 if (rotate_up) { | |
1639 assert((src_slot > dest_slot) && (src_arg < dest_arg), ""); | |
1640 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot] | |
1641 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1] | |
1642 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) { | |
1643 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), | |
1644 java_dyn_MethodType::ptype(dest_mtype, i-1), | |
1645 i); | |
1646 } | |
1647 } else { // rotate down | |
1648 assert((src_slot < dest_slot) && (src_arg > dest_arg), ""); | |
1649 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss] | |
1650 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg] | |
1651 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) { | |
1652 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), | |
1653 java_dyn_MethodType::ptype(dest_mtype, i+1), | |
1654 i); | |
1655 } | |
1656 } | |
1657 } | |
1658 if (err == NULL) | |
1659 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, src_arg), | |
1660 java_dyn_MethodType::ptype(dest_mtype, dest_arg), | |
1661 src_arg); | |
1662 } | |
1663 break; | |
1664 case _adapter_collect_args: | |
1665 case _adapter_spread_args: | |
1666 { | |
1667 BasicType coll_type = (ek == _adapter_collect_args) ? dest : src; | |
1668 BasicType elem_type = (ek == _adapter_collect_args) ? src : dest; | |
1669 if (coll_type != T_OBJECT || elem_type != T_OBJECT) { | |
1670 err = "adapter requires src/dest subfields"; break; | |
1671 // later: | |
1672 // - consider making coll be a primitive array | |
1673 // - consider making coll be a heterogeneous collection | |
1674 } | |
1675 } | |
1676 break; | |
1677 default: | |
1678 if (src != 0 || dest != 0) { | |
1679 err = "adapter has spurious src/dest conversion subfields"; break; | |
1680 } | |
1681 break; | |
1682 } | |
1683 } | |
1684 | |
1685 if (err == NULL) { | |
1686 // Check the stack_move subfield. | |
1687 // It must always report the net change in stack size, positive or negative. | |
1688 int slots_pushed = stack_move / stack_move_unit(); | |
1689 switch (ek) { | |
1690 case _adapter_prim_to_prim: | |
1691 case _adapter_ref_to_prim: | |
1692 case _adapter_prim_to_ref: | |
1693 if (slots_pushed != type2size[dest] - type2size[src]) { | |
1694 err = "wrong stack motion for primitive conversion"; | |
1695 } | |
1696 break; | |
1697 case _adapter_dup_args: | |
1698 if (slots_pushed <= 0) { | |
1699 err = "adapter requires conversion subfield slots_pushed > 0"; | |
1700 } | |
1701 break; | |
1702 case _adapter_drop_args: | |
1703 if (slots_pushed >= 0) { | |
1704 err = "adapter requires conversion subfield slots_pushed < 0"; | |
1705 } | |
1706 break; | |
1707 case _adapter_collect_args: | |
1708 if (slots_pushed > 1) { | |
1709 err = "adapter requires conversion subfield slots_pushed <= 1"; | |
1710 } | |
1711 break; | |
1712 case _adapter_spread_args: | |
1713 if (slots_pushed < -1) { | |
1714 err = "adapter requires conversion subfield slots_pushed >= -1"; | |
1715 } | |
1716 break; | |
1717 default: | |
1718 if (stack_move != 0) { | |
1719 err = "adapter has spurious stack_move conversion subfield"; | |
1720 } | |
1721 break; | |
1722 } | |
1723 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) { | |
1724 err = "stack_move conversion subfield must be multiple of stack_move_unit"; | |
1725 } | |
1726 } | |
1727 | |
1728 if (err == NULL) { | |
1729 // Make sure this adapter does not push too deeply. | |
1730 int slots_pushed = stack_move / stack_move_unit(); | |
1731 int this_vmslots = java_dyn_MethodHandle::vmslots(mh()); | |
1732 int prev_vmslots = java_dyn_MethodHandle::vmslots(target()); | |
1733 if (slots_pushed != (this_vmslots - prev_vmslots)) { | |
1734 err = "stack_move inconsistent with previous and current MethodType vmslots"; | |
1735 } else if (slots_pushed > 0) { | |
1736 // verify stack_move against MethodHandlePushLimit | |
1737 int prev_pushes = decode_MethodHandle_stack_pushes(target()); | |
1738 // do not blow the stack; use a Java-based adapter if this limit is exceeded | |
1739 if (slots_pushed + prev_pushes > MethodHandlePushLimit) { | |
1740 err = "adapter pushes too many parameters"; | |
1741 } | |
1742 } | |
1743 | |
1744 // While we're at it, check that the stack motion decoder works: | |
1745 DEBUG_ONLY(int prev_pushes = decode_MethodHandle_stack_pushes(target())); | |
1746 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); | |
1747 assert(this_pushes == slots_pushed + prev_pushes, "AMH stack motion must be correct"); | |
1748 } | |
1749 | |
1750 if (err == NULL && vminfo != 0) { | |
1751 switch (ek) { | |
1752 case _adapter_swap_args: | |
1753 case _adapter_rot_args: | |
1754 break; // OK | |
1755 default: | |
1756 err = "vminfo subfield is reserved to the JVM"; | |
1757 } | |
1758 } | |
1759 | |
1760 // Do additional ad hoc checks. | |
1761 if (err == NULL) { | |
1762 switch (ek) { | |
1763 case _adapter_retype_only: | |
1764 err = check_method_type_passthrough(src_mtype(), dst_mtype()); | |
1765 break; | |
1766 | |
1767 case _adapter_check_cast: | |
1768 { | |
1769 // The actual value being checked must be a reference: | |
1770 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype(), argnum), | |
1771 object_java_mirror(), argnum); | |
1772 if (err != NULL) break; | |
1773 | |
1774 // The output of the cast must fit with the destination argument: | |
1775 Handle cast_class = argument; | |
1776 err = check_method_type_conversion(src_mtype(), | |
1777 argnum, cast_class(), | |
1778 dst_mtype()); | |
1779 } | |
1780 break; | |
1781 | |
1782 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles | |
1783 } | |
1784 } | |
1785 | |
1786 if (err != NULL) { | |
1787 throw_InternalError_for_bad_conversion(conversion, err, THREAD); | |
1788 return; | |
1789 } | |
1790 | |
1791 } | |
1792 | |
1793 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { | |
1794 oop argument = sun_dyn_AdapterMethodHandle::argument(mh()); | |
1795 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); | |
1796 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); | |
1797 jint conv_op = adapter_conversion_op(conversion); | |
1798 | |
1799 // adjust the adapter code to the internal EntryKind enumeration: | |
1800 EntryKind ek_orig = adapter_entry_kind(conv_op); | |
1801 EntryKind ek_opt = ek_orig; // may be optimized | |
1802 | |
1803 // Finalize the vmtarget field (Java initialized it to null). | |
1804 if (!java_dyn_MethodHandle::is_instance(target())) { | |
1805 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD); | |
1806 return; | |
1807 } | |
1808 sun_dyn_AdapterMethodHandle::set_vmtarget(mh(), target()); | |
1809 | |
1810 if (VerifyMethodHandles) { | |
1811 verify_AdapterMethodHandle(mh, argnum, CHECK); | |
1812 } | |
1813 | |
1814 int stack_move = adapter_conversion_stack_move(conversion); | |
1815 BasicType src = adapter_conversion_src_type(conversion); | |
1816 BasicType dest = adapter_conversion_dest_type(conversion); | |
1817 int vminfo = adapter_conversion_vminfo(conversion); // should be zero | |
1818 | |
1819 const char* err = NULL; | |
1820 | |
1821 // Now it's time to finish the case analysis and pick a MethodHandleEntry. | |
1822 switch (ek_orig) { | |
1823 case _adapter_retype_only: | |
1824 case _adapter_check_cast: | |
1825 case _adapter_dup_args: | |
1826 case _adapter_drop_args: | |
1827 // these work fine via general case code | |
1828 break; | |
1829 | |
1830 case _adapter_prim_to_prim: | |
1831 { | |
1832 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}. | |
1833 // And, the {float,double} -> {int,long} cases must be handled by Java. | |
1834 switch (type2size[src] *4+ type2size[dest]) { | |
1835 case 1 *4+ 1: | |
1836 assert(src == T_INT || is_subword_type(src), "source is not float"); | |
1837 // Subword-related cases are int -> {boolean,byte,char,short}. | |
1838 ek_opt = _adapter_opt_i2i; | |
1839 vminfo = adapter_subword_vminfo(dest); | |
1840 break; | |
1841 case 2 *4+ 1: | |
1842 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) { | |
1843 ek_opt = _adapter_opt_l2i; | |
1844 vminfo = adapter_subword_vminfo(dest); | |
1845 } else if (src == T_DOUBLE && dest == T_FLOAT) { | |
1846 ek_opt = _adapter_opt_d2f; | |
1847 } else { | |
1848 assert(false, ""); | |
1849 } | |
1850 break; | |
1851 case 1 *4+ 2: | |
1852 if (src == T_INT && dest == T_LONG) { | |
1853 ek_opt = _adapter_opt_i2l; | |
1854 } else if (src == T_FLOAT && dest == T_DOUBLE) { | |
1855 ek_opt = _adapter_opt_f2d; | |
1856 } else { | |
1857 assert(false, ""); | |
1858 } | |
1859 break; | |
1860 default: | |
1861 assert(false, ""); | |
1862 break; | |
1863 } | |
1864 } | |
1865 break; | |
1866 | |
1867 case _adapter_ref_to_prim: | |
1868 { | |
1869 switch (type2size[dest]) { | |
1870 case 1: | |
1871 ek_opt = _adapter_opt_unboxi; | |
1872 vminfo = adapter_subword_vminfo(dest); | |
1873 break; | |
1874 case 2: | |
1875 ek_opt = _adapter_opt_unboxl; | |
1876 break; | |
1877 default: | |
1878 assert(false, ""); | |
1879 break; | |
1880 } | |
1881 } | |
1882 break; | |
1883 | |
1884 case _adapter_prim_to_ref: | |
1885 goto throw_not_impl; // allocates, hence could block | |
1886 | |
1887 case _adapter_swap_args: | |
1888 case _adapter_rot_args: | |
1889 { | |
1890 int swap_slots = type2size[src]; | |
1891 oop mtype = sun_dyn_AdapterMethodHandle::type(mh()); | |
1892 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(mtype); | |
1893 int src_slot = argslot; | |
1894 int dest_slot = vminfo; | |
1895 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1; | |
1896 switch (swap_slots) { | |
1897 case 1: | |
1898 ek_opt = (!rotate ? _adapter_opt_swap_1 : | |
1899 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down); | |
1900 break; | |
1901 case 2: | |
1902 ek_opt = (!rotate ? _adapter_opt_swap_2 : | |
1903 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down); | |
1904 break; | |
1905 default: | |
1906 assert(false, ""); | |
1907 break; | |
1908 } | |
1909 } | |
1910 break; | |
1911 | |
1912 case _adapter_collect_args: | |
1913 goto throw_not_impl; // allocates, hence could block | |
1914 | |
1915 case _adapter_spread_args: | |
1916 { | |
1917 // vminfo will be the required length of the array | |
1918 int slots_pushed = stack_move / stack_move_unit(); | |
1919 int array_size = slots_pushed + 1; | |
1920 assert(array_size >= 0, ""); | |
1921 vminfo = array_size; | |
1922 switch (array_size) { | |
1923 case 0: ek_opt = _adapter_opt_spread_0; break; | |
1924 case 1: ek_opt = _adapter_opt_spread_1; break; | |
1925 default: ek_opt = _adapter_opt_spread_more; break; | |
1926 } | |
1927 if ((vminfo & CONV_VMINFO_MASK) != vminfo) | |
1928 goto throw_not_impl; // overflow | |
1929 } | |
1930 break; | |
1931 | |
1932 case _adapter_flyby: | |
1933 case _adapter_ricochet: | |
1934 goto throw_not_impl; // runs Java code, hence could block | |
1935 | |
1936 default: | |
1937 // should have failed much earlier; must be a missing case here | |
1938 assert(false, "incomplete switch"); | |
1939 // and fall through: | |
1940 | |
1941 throw_not_impl: | |
1942 // FIXME: these adapters are NYI | |
1943 err = "adapter not yet implemented in the JVM"; | |
1944 break; | |
1945 } | |
1946 | |
1947 if (err != NULL) { | |
1948 throw_InternalError_for_bad_conversion(conversion, err, THREAD); | |
1949 return; | |
1950 } | |
1951 | |
1952 // Rebuild the conversion value; maybe parts of it were changed. | |
1953 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo); | |
1954 | |
1955 // Finalize the conversion field. (Note that it is final to Java code.) | |
1956 sun_dyn_AdapterMethodHandle::set_conversion(mh(), new_conversion); | |
1957 | |
1958 // Done! | |
1959 java_dyn_MethodHandle::set_vmentry(mh(), entry(ek_opt)); | |
1960 | |
1961 // There should be enough memory barriers on exit from native methods | |
1962 // to ensure that the MH is fully initialized to all threads before | |
1963 // Java code can publish it in global data structures. | |
1964 } | |
1965 | |
1966 // | |
1967 // Here are the native methods on sun.dyn.MethodHandleImpl. | |
1968 // They are the private interface between this JVM and the HotSpot-specific | |
1969 // Java code that implements JSR 292 method handles. | |
1970 // | |
1971 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way | |
1972 // that intrinsic (non-JNI) native methods are defined in HotSpot. | |
1973 // | |
1974 | |
1975 // direct method handles for invokestatic or invokespecial | |
1976 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller); | |
1977 JVM_ENTRY(void, MHI_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
1978 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) { | |
1979 ResourceMark rm; // for error messages | |
1980 | |
1981 // This is the guy we are initializing: | |
1982 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
1983 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
1984 | |
1985 // Early returns out of this method leave the DMH in an unfinished state. | |
1986 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
1987 | |
1988 // which method are we really talking about? | |
1989 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
1990 oop target_oop = JNIHandles::resolve_non_null(target_jh); | |
1991 if (sun_dyn_MemberName::is_instance(target_oop) && | |
1992 sun_dyn_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) { | |
1993 Handle mname(THREAD, target_oop); | |
1994 MethodHandles::resolve_MemberName(mname, CHECK); | |
1995 target_oop = mname(); // in case of GC | |
1996 } | |
1997 | |
1998 int decode_flags = 0; klassOop receiver_limit = NULL; | |
1999 methodHandle m(THREAD, | |
2000 MethodHandles::decode_method(target_oop, | |
2001 receiver_limit, decode_flags)); | |
2002 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); } | |
2003 | |
2004 // The trusted Java code that calls this method should already have performed | |
2005 // access checks on behalf of the given caller. But, we can verify this. | |
2006 if (VerifyMethodHandles && caller_jh != NULL) { | |
2007 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh))); | |
2008 // If this were a bytecode, the first access check would be against | |
2009 // the "reference class" mentioned in the CONSTANT_Methodref. | |
2010 // For that class, we use the defining class of m, | |
2011 // or a more specific receiver limit if available. | |
2012 klassOop reference_klass = m->method_holder(); // OK approximation | |
2013 if (receiver_limit != NULL && receiver_limit != reference_klass) { | |
2014 if (!Klass::cast(receiver_limit)->is_subtype_of(reference_klass)) | |
2015 THROW_MSG(vmSymbols::java_lang_InternalError(), "receiver limit out of bounds"); // Java code bug | |
2016 reference_klass = receiver_limit; | |
2017 } | |
2018 // Emulate LinkResolver::check_klass_accessability. | |
2019 if (!Reflection::verify_class_access(caller->as_klassOop(), | |
2020 reference_klass, | |
2021 true)) { | |
2022 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(m->method_holder())->external_name()); | |
2023 } | |
2024 // If there were a bytecode, the next step would be to lookup the method | |
2025 // in the reference class, then then check the method's access bits. | |
2026 // Emulate LinkResolver::check_method_accessability. | |
2027 klassOop resolved_klass = m->method_holder(); | |
2028 if (!Reflection::verify_field_access(caller->as_klassOop(), | |
2029 resolved_klass, reference_klass, | |
2030 m->access_flags(), | |
2031 true)) { | |
2032 // %%% following cutout belongs in Reflection::verify_field_access? | |
2033 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(), | |
2034 reference_klass, THREAD); | |
2035 if (!same_pm) { | |
2036 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string()); | |
2037 } | |
2038 } | |
2039 } | |
2040 | |
2041 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK); | |
2042 } | |
2043 JVM_END | |
2044 | |
2045 // bound method handles | |
2046 JVM_ENTRY(void, MHI_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
2047 jobject target_jh, int argnum)) { | |
2048 ResourceMark rm; // for error messages | |
2049 | |
2050 // This is the guy we are initializing: | |
2051 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2052 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
2053 | |
2054 // Early returns out of this method leave the BMH in an unfinished state. | |
2055 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
2056 | |
2057 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2058 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); | |
2059 | |
2060 if (!java_dyn_MethodHandle::is_instance(target())) { | |
2061 // Target object is a reflective method. (%%% Do we need this alternate path?) | |
2062 Untested("init_BMH of non-MH"); | |
2063 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); } | |
2064 int decode_flags = 0; klassOop receiver_limit_oop = NULL; | |
2065 methodHandle m(THREAD, | |
2066 MethodHandles::decode_method(target(), | |
2067 receiver_limit_oop, | |
2068 decode_flags)); | |
2069 KlassHandle receiver_limit(THREAD, receiver_limit_oop); | |
2070 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m, | |
2071 receiver_limit, | |
2072 decode_flags, | |
2073 CHECK); | |
2074 return; | |
2075 } | |
2076 | |
2077 // Build a BMH on top of a DMH or another BMH: | |
2078 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK); | |
2079 } | |
2080 JVM_END | |
2081 | |
2082 // adapter method handles | |
2083 JVM_ENTRY(void, MHI_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
2084 jobject target_jh, int argnum)) { | |
2085 // This is the guy we are initializing: | |
2086 if (mh_jh == NULL || target_jh == NULL) { | |
2087 THROW(vmSymbols::java_lang_InternalError()); | |
2088 } | |
2089 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
2090 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); | |
2091 | |
2092 // Early returns out of this method leave the AMH in an unfinished state. | |
2093 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
2094 | |
2095 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK); | |
2096 } | |
2097 JVM_END | |
2098 | |
2099 // method type forms | |
2100 JVM_ENTRY(void, MHI_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) { | |
2101 if (erased_jh == NULL) return; | |
2102 if (TraceMethodHandles) { | |
2103 tty->print("creating MethodType form "); | |
2104 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH! | |
2105 // call Object.toString() | |
2106 symbolOop name = vmSymbols::toString_name(), sig = vmSymbols::void_string_signature(); | |
2107 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh))); | |
2108 JavaValue result(T_OBJECT); | |
2109 JavaCalls::call_virtual(&result, SystemDictionary::object_klass(), name, sig, | |
2110 &args, CHECK); | |
2111 Handle str(THREAD, (oop)result.get_jobject()); | |
2112 java_lang_String::print(str, tty); | |
2113 } | |
2114 tty->cr(); | |
2115 } | |
2116 } | |
2117 JVM_END | |
2118 | |
2119 // debugging and reflection | |
2120 JVM_ENTRY(jobject, MHI_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) { | |
2121 Handle mh(THREAD, JNIHandles::resolve(mh_jh)); | |
2122 if (!java_dyn_MethodHandle::is_instance(mh())) { | |
2123 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); | |
2124 } | |
2125 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL); | |
2126 return JNIHandles::make_local(THREAD, target); | |
2127 } | |
2128 JVM_END | |
2129 | |
2130 JVM_ENTRY(jint, MHI_getConstant(JNIEnv *env, jobject igcls, jint which)) { | |
2131 switch (which) { | |
2132 case MethodHandles::GC_JVM_PUSH_LIMIT: | |
2133 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF, | |
2134 "MethodHandlePushLimit parameter must be in valid range"); | |
2135 return MethodHandlePushLimit; | |
2136 case MethodHandles::GC_JVM_STACK_MOVE_LIMIT: | |
2137 // return number of words per slot, signed according to stack direction | |
2138 return MethodHandles::stack_move_unit(); | |
2139 } | |
2140 return 0; | |
2141 } | |
2142 JVM_END | |
2143 | |
2144 #ifndef PRODUCT | |
2145 #define EACH_NAMED_CON(template) \ | |
2146 template(MethodHandles,GC_JVM_PUSH_LIMIT) \ | |
2147 template(MethodHandles,GC_JVM_STACK_MOVE_LIMIT) \ | |
2148 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \ | |
2149 template(MethodHandles,ETF_DIRECT_HANDLE) \ | |
2150 template(MethodHandles,ETF_METHOD_NAME) \ | |
2151 template(MethodHandles,ETF_REFLECT_METHOD) \ | |
2152 template(sun_dyn_MemberName,MN_IS_METHOD) \ | |
2153 template(sun_dyn_MemberName,MN_IS_CONSTRUCTOR) \ | |
2154 template(sun_dyn_MemberName,MN_IS_FIELD) \ | |
2155 template(sun_dyn_MemberName,MN_IS_TYPE) \ | |
2156 template(sun_dyn_MemberName,MN_SEARCH_SUPERCLASSES) \ | |
2157 template(sun_dyn_MemberName,MN_SEARCH_INTERFACES) \ | |
2158 template(sun_dyn_MemberName,VM_INDEX_UNINITIALIZED) \ | |
2159 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_ONLY) \ | |
2160 template(sun_dyn_AdapterMethodHandle,OP_CHECK_CAST) \ | |
2161 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_PRIM) \ | |
2162 template(sun_dyn_AdapterMethodHandle,OP_REF_TO_PRIM) \ | |
2163 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_REF) \ | |
2164 template(sun_dyn_AdapterMethodHandle,OP_SWAP_ARGS) \ | |
2165 template(sun_dyn_AdapterMethodHandle,OP_ROT_ARGS) \ | |
2166 template(sun_dyn_AdapterMethodHandle,OP_DUP_ARGS) \ | |
2167 template(sun_dyn_AdapterMethodHandle,OP_DROP_ARGS) \ | |
2168 template(sun_dyn_AdapterMethodHandle,OP_COLLECT_ARGS) \ | |
2169 template(sun_dyn_AdapterMethodHandle,OP_SPREAD_ARGS) \ | |
2170 template(sun_dyn_AdapterMethodHandle,OP_FLYBY) \ | |
2171 template(sun_dyn_AdapterMethodHandle,OP_RICOCHET) \ | |
2172 template(sun_dyn_AdapterMethodHandle,CONV_OP_LIMIT) \ | |
2173 template(sun_dyn_AdapterMethodHandle,CONV_OP_MASK) \ | |
2174 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_MASK) \ | |
2175 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_SHIFT) \ | |
2176 template(sun_dyn_AdapterMethodHandle,CONV_OP_SHIFT) \ | |
2177 template(sun_dyn_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \ | |
2178 template(sun_dyn_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \ | |
2179 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \ | |
2180 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \ | |
2181 /*end*/ | |
2182 | |
2183 #define ONE_PLUS(scope,value) 1+ | |
2184 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0; | |
2185 #define VALUE_COMMA(scope,value) scope::value, | |
2186 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 }; | |
2187 #define STRING_NULL(scope,value) #value "\0" | |
2188 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) }; | |
2189 | |
2190 #undef ONE_PLUS | |
2191 #undef VALUE_COMMA | |
2192 #undef STRING_NULL | |
2193 #undef EACH_NAMED_CON | |
2194 #endif | |
2195 | |
2196 JVM_ENTRY(jint, MHI_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { | |
2197 #ifndef PRODUCT | |
2198 if (which >= 0 && which < con_value_count) { | |
2199 int con = con_values[which]; | |
2200 objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh); | |
2201 if (box != NULL && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { | |
2202 const char* str = &con_names[0]; | |
2203 for (int i = 0; i < which; i++) | |
2204 str += strlen(str) + 1; // skip name and null | |
2205 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); | |
2206 box->obj_at_put(0, name); | |
2207 } | |
2208 return con; | |
2209 } | |
2210 #endif | |
2211 return 0; | |
2212 } | |
2213 JVM_END | |
2214 | |
2215 // void init(MemberName self, AccessibleObject ref) | |
2216 JVM_ENTRY(void, MHI_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { | |
2217 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2218 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
2219 oop target_oop = JNIHandles::resolve_non_null(target_jh); | |
2220 MethodHandles::init_MemberName(mname(), target_oop); | |
2221 } | |
2222 JVM_END | |
2223 | |
2224 // void expand(MemberName self) | |
2225 JVM_ENTRY(void, MHI_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { | |
2226 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2227 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
2228 MethodHandles::expand_MemberName(mname, 0, CHECK); | |
2229 } | |
2230 JVM_END | |
2231 | |
2232 // void resolve(MemberName self, Class<?> caller) | |
2233 JVM_ENTRY(void, MHI_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { | |
2234 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2235 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
2236 // %%% take caller into account! | |
2237 MethodHandles::resolve_MemberName(mname, CHECK); | |
2238 } | |
2239 JVM_END | |
2240 | |
2241 // static native int getMembers(Class<?> defc, String matchName, String matchSig, | |
2242 // int matchFlags, Class<?> caller, int skip, MemberName[] results); | |
2243 JVM_ENTRY(jint, MHI_getMembers(JNIEnv *env, jobject igcls, | |
2244 jclass clazz_jh, jstring name_jh, jstring sig_jh, | |
2245 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { | |
2246 if (clazz_jh == NULL || results_jh == NULL) return -1; | |
2247 klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)); | |
2248 | |
2249 objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh); | |
2250 if (results == NULL || !results->is_objArray()) return -1; | |
2251 | |
2252 symbolOop name = NULL, sig = NULL; | |
2253 if (name_jh != NULL) { | |
2254 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); | |
2255 if (name == NULL) return 0; // a match is not possible | |
2256 } | |
2257 if (sig_jh != NULL) { | |
2258 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); | |
2259 if (sig == NULL) return 0; // a match is not possible | |
2260 } | |
2261 | |
2262 klassOop caller = NULL; | |
2263 if (caller_jh != NULL) { | |
2264 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); | |
2265 if (!java_lang_Class::is_instance(caller_oop)) return -1; | |
2266 caller = java_lang_Class::as_klassOop(caller_oop); | |
2267 } | |
2268 | |
2269 if (name != NULL && sig != NULL && results != NULL) { | |
2270 // try a direct resolve | |
2271 // %%% TO DO | |
2272 } | |
2273 | |
2274 int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags, | |
2275 caller, skip, results); | |
2276 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks | |
2277 return res; | |
2278 } | |
2279 JVM_END | |
2280 | |
2281 | |
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2282 JVM_ENTRY(void, MH_linkCallSite(JNIEnv *env, jobject igcls, jobject site_jh, jobject target_jh)) { |
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2283 // No special action required, yet. |
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2284 oop site_oop = JNIHandles::resolve(site_jh); |
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2285 if (site_oop == NULL || site_oop->klass() != SystemDictionary::CallSiteImpl_klass()) |
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2286 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "call site"); |
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2287 sun_dyn_CallSiteImpl::set_target(site_oop, JNIHandles::resolve(target_jh)); |
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2288 } |
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2289 JVM_END |
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2290 |
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2291 |
710 | 2292 /// JVM_RegisterMethodHandleMethods |
2293 | |
2294 #define ADR "J" | |
2295 | |
2296 #define LANG "Ljava/lang/" | |
2297 #define JDYN "Ljava/dyn/" | |
2298 #define IDYN "Lsun/dyn/" | |
2299 | |
2300 #define OBJ LANG"Object;" | |
2301 #define CLS LANG"Class;" | |
2302 #define STRG LANG"String;" | |
2303 #define MT JDYN"MethodType;" | |
2304 #define MH JDYN"MethodHandle;" | |
2305 #define MHI IDYN"MethodHandleImpl;" | |
2306 #define MEM IDYN"MemberName;" | |
2307 #define AMH IDYN"AdapterMethodHandle;" | |
2308 #define BMH IDYN"BoundMethodHandle;" | |
2309 #define DMH IDYN"DirectMethodHandle;" | |
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2310 #define CSTI IDYN"CallSiteImpl;" |
710 | 2311 |
2312 #define CC (char*) /*cast a literal from (const char*)*/ | |
2313 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) | |
2314 | |
2315 // These are the native methods on sun.dyn.MethodHandleNatives. | |
2316 static JNINativeMethod methods[] = { | |
2317 // void init(MemberName self, AccessibleObject ref) | |
2318 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHI_init_AMH)}, | |
2319 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHI_init_BMH)}, | |
2320 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHI_init_DMH)}, | |
2321 {CC"init", CC"("MT")V", FN_PTR(MHI_init_MT)}, | |
2322 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHI_init_Mem)}, | |
2323 {CC"expand", CC"("MEM")V", FN_PTR(MHI_expand_Mem)}, | |
2324 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHI_resolve_Mem)}, | |
2325 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHI_getTarget)}, | |
2326 {CC"getConstant", CC"(I)I", FN_PTR(MHI_getConstant)}, | |
2327 // static native int getNamedCon(int which, Object[] name) | |
2328 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHI_getNamedCon)}, | |
2329 // static native int getMembers(Class<?> defc, String matchName, String matchSig, | |
2330 // int matchFlags, Class<?> caller, int skip, MemberName[] results); | |
2331 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHI_getMembers)} | |
2332 }; | |
2333 | |
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2334 // More entry points specifically for EnableInvokeDynamic. |
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2335 static JNINativeMethod methods2[] = { |
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2336 {CC"linkCallSite", CC"("CSTI MH")V", FN_PTR(MH_linkCallSite)} |
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2337 }; |
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2338 |
710 | 2339 |
2340 // This one function is exported, used by NativeLookup. | |
2341 | |
2342 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { | |
2343 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK"); | |
2344 | |
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2345 // note: this explicit warning-producing stuff will be replaced by auto-detection of the JSR 292 classes |
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2346 |
710 | 2347 if (!EnableMethodHandles) { |
2348 warning("JSR 292 method handles are disabled in this JVM. Use -XX:+EnableMethodHandles to enable."); | |
2349 return; // bind nothing | |
2350 } | |
2351 | |
2352 { | |
2353 ThreadToNativeFromVM ttnfv(thread); | |
2354 | |
2355 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod)); | |
2356 if (env->ExceptionOccurred()) { | |
2357 MethodHandles::set_enabled(false); | |
2358 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); | |
2359 env->ExceptionClear(); | |
2360 } else { | |
2361 MethodHandles::set_enabled(true); | |
2362 } | |
2363 } | |
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2364 |
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2365 if (!EnableInvokeDynamic) { |
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2366 warning("JSR 292 invokedynamic is disabled in this JVM. Use -XX:+EnableInvokeDynamic to enable."); |
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2367 return; // bind nothing |
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2368 } |
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2369 |
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2370 { |
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2371 ThreadToNativeFromVM ttnfv(thread); |
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2372 |
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2373 int status = env->RegisterNatives(MHN_class, methods2, sizeof(methods2)/sizeof(JNINativeMethod)); |
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2374 if (env->ExceptionOccurred()) { |
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2375 MethodHandles::set_enabled(false); |
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2376 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); |
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2377 env->ExceptionClear(); |
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2378 } else { |
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2379 MethodHandles::set_enabled(true); |
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2380 } |
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2381 } |
710 | 2382 } |
2383 JVM_END |