Mercurial > hg > truffle
annotate src/share/vm/prims/methodHandles.cpp @ 1039:987e948ebbc8
6815692: method handle code needs some cleanup (post-6655638)
Summary: correctly raise exceptions, support safe bitwise "raw" conversions, fix bugs revealed by VerifyMethodHandles, remove dead code, improve debugging support
Reviewed-by: never, twisti
author | jrose |
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date | Sat, 17 Oct 2009 19:51:05 -0700 |
parents | be93aad57795 |
children | 389049f3f393 |
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] = { | |
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36 "raise_exception", |
710 | 37 "invokestatic", // how a MH emulates invokestatic |
38 "invokespecial", // ditto for the other invokes... | |
39 "invokevirtual", | |
40 "invokeinterface", | |
41 "bound_ref", // these are for BMH... | |
42 "bound_int", | |
43 "bound_long", | |
44 "bound_ref_direct", // (direct versions have a direct methodOop) | |
45 "bound_int_direct", | |
46 "bound_long_direct", | |
47 | |
48 // starting at _adapter_mh_first: | |
49 "adapter_retype_only", // these are for AMH... | |
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50 "adapter_retype_raw", |
710 | 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 | |
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85 jobject MethodHandles::_raise_exception_method; |
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86 |
710 | 87 #ifdef ASSERT |
88 bool MethodHandles::spot_check_entry_names() { | |
89 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), ""); | |
90 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), ""); | |
91 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), ""); | |
92 assert(!strcmp(entry_name(_adapter_ricochet), "adapter_ricochet"), ""); | |
93 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), ""); | |
94 return true; | |
95 } | |
96 #endif | |
97 | |
98 void MethodHandles::set_enabled(bool z) { | |
99 if (_enabled != z) { | |
100 guarantee(z && EnableMethodHandles, "can only enable once, and only if -XX:+EnableMethodHandles"); | |
101 _enabled = z; | |
102 } | |
103 } | |
104 | |
105 // Note: A method which does not have a TRAPS argument cannot block in the GC | |
106 // or throw exceptions. Such methods are used in this file to do something quick | |
107 // and local, like parse a data structure. For speed, such methods work on plain | |
108 // oops, not handles. Trapping methods uniformly operate on handles. | |
109 | |
110 methodOop MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype, | |
111 klassOop& receiver_limit_result, int& decode_flags_result) { | |
112 if (vmtarget == NULL) return NULL; | |
113 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding"); | |
114 if (vmindex < 0) { | |
115 // this DMH performs no dispatch; it is directly bound to a methodOop | |
116 // A MemberName may either be directly bound to a methodOop, | |
117 // or it may use the klass/index form; both forms mean the same thing. | |
118 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result); | |
119 if ((decode_flags_result & _dmf_has_receiver) != 0 | |
120 && java_dyn_MethodType::is_instance(mtype)) { | |
121 // Extract receiver type restriction from mtype.ptypes[0]. | |
122 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype); | |
123 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0); | |
124 if (java_lang_Class::is_instance(ptype0)) | |
125 receiver_limit_result = java_lang_Class::as_klassOop(ptype0); | |
126 } | |
127 if (vmindex == methodOopDesc::nonvirtual_vtable_index) { | |
128 // this DMH can be an "invokespecial" version | |
129 decode_flags_result &= ~_dmf_does_dispatch; | |
130 } else { | |
131 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?"); | |
132 } | |
133 return m; | |
134 } else { | |
135 decode_flags_result |= MethodHandles::_dmf_does_dispatch; | |
136 assert(vmtarget->is_klass(), "must be class or interface"); | |
137 receiver_limit_result = (klassOop)vmtarget; | |
138 Klass* tk = Klass::cast((klassOop)vmtarget); | |
139 if (tk->is_interface()) { | |
140 // an itable linkage is <interface, itable index> | |
141 decode_flags_result |= MethodHandles::_dmf_from_interface; | |
142 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex); | |
143 } else { | |
144 if (!tk->oop_is_instance()) | |
145 tk = instanceKlass::cast(SystemDictionary::object_klass()); | |
146 return ((instanceKlass*)tk)->method_at_vtable(vmindex); | |
147 } | |
148 } | |
149 } | |
150 | |
151 // MemberName and DirectMethodHandle have the same linkage to the JVM internals. | |
152 // (MemberName is the non-operational name used for queries and setup.) | |
153 | |
154 methodOop MethodHandles::decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
155 oop vmtarget = sun_dyn_DirectMethodHandle::vmtarget(mh); | |
156 int vmindex = sun_dyn_DirectMethodHandle::vmindex(mh); | |
157 oop mtype = sun_dyn_DirectMethodHandle::type(mh); | |
158 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result); | |
159 } | |
160 | |
161 methodOop MethodHandles::decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
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162 assert(sun_dyn_BoundMethodHandle::is_instance(mh), ""); |
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163 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), ""); |
710 | 164 for (oop bmh = mh;;) { |
165 // Bound MHs can be stacked to bind several arguments. | |
166 oop target = java_dyn_MethodHandle::vmtarget(bmh); | |
167 if (target == NULL) return NULL; | |
168 decode_flags_result |= MethodHandles::_dmf_binds_argument; | |
169 klassOop tk = target->klass(); | |
170 if (tk == SystemDictionary::BoundMethodHandle_klass()) { | |
171 bmh = target; | |
172 continue; | |
173 } else { | |
174 if (java_dyn_MethodHandle::is_subclass(tk)) { | |
175 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH"); | |
176 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result); | |
177 } else { | |
178 // Optimized case: binding a receiver to a non-dispatched DMH | |
179 // short-circuits directly to the methodOop. | |
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180 // (It might be another argument besides a receiver also.) |
710 | 181 assert(target->is_method(), "must be a simple method"); |
182 methodOop m = (methodOop) target; | |
183 decode_flags_result |= MethodHandles::_dmf_binds_method; | |
184 return m; | |
185 } | |
186 } | |
187 } | |
188 } | |
189 | |
190 methodOop MethodHandles::decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
191 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), ""); | |
192 for (oop amh = mh;;) { | |
193 // Adapter MHs can be stacked to convert several arguments. | |
194 int conv_op = adapter_conversion_op(sun_dyn_AdapterMethodHandle::conversion(amh)); | |
195 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK; | |
196 oop target = java_dyn_MethodHandle::vmtarget(amh); | |
197 if (target == NULL) return NULL; | |
198 klassOop tk = target->klass(); | |
199 if (tk == SystemDictionary::AdapterMethodHandle_klass()) { | |
200 amh = target; | |
201 continue; | |
202 } else { | |
203 // must be a BMH (which will bind some more arguments) or a DMH (for the final call) | |
204 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result); | |
205 } | |
206 } | |
207 } | |
208 | |
209 methodOop MethodHandles::decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
210 if (mh == NULL) return NULL; | |
211 klassOop mhk = mh->klass(); | |
212 assert(java_dyn_MethodHandle::is_subclass(mhk), "must be a MethodHandle"); | |
213 if (mhk == SystemDictionary::DirectMethodHandle_klass()) { | |
214 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
215 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) { | |
216 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
217 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) { | |
218 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
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219 } else if (sun_dyn_BoundMethodHandle::is_subclass(mhk)) { |
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220 // could be a JavaMethodHandle (but not an adapter MH) |
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221 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); |
710 | 222 } else { |
223 assert(false, "cannot parse this MH"); | |
224 return NULL; // random MH? | |
225 } | |
226 } | |
227 | |
228 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) { | |
229 assert(m->is_method(), ""); | |
230 if (m->is_static()) { | |
231 // check that signature begins '(L' or '([' (not '(I', '()', etc.) | |
232 symbolOop sig = m->signature(); | |
233 BasicType recv_bt = char2type(sig->byte_at(1)); | |
234 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')' | |
235 assert(sig->byte_at(0) == '(', "must be method sig"); | |
236 if (recv_bt == T_OBJECT || recv_bt == T_ARRAY) | |
237 decode_flags_result |= _dmf_has_receiver; | |
238 } else { | |
239 // non-static method | |
240 decode_flags_result |= _dmf_has_receiver; | |
241 if (!m->can_be_statically_bound() && !m->is_initializer()) { | |
242 decode_flags_result |= _dmf_does_dispatch; | |
243 if (Klass::cast(m->method_holder())->is_interface()) | |
244 decode_flags_result |= _dmf_from_interface; | |
245 } | |
246 } | |
247 return m; | |
248 } | |
249 | |
250 | |
251 // A trusted party is handing us a cookie to determine a method. | |
252 // Let's boil it down to the method oop they really want. | |
253 methodOop MethodHandles::decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result) { | |
254 decode_flags_result = 0; | |
255 receiver_limit_result = NULL; | |
256 klassOop xk = x->klass(); | |
257 if (xk == Universe::methodKlassObj()) { | |
258 return decode_methodOop((methodOop) x, decode_flags_result); | |
259 } else if (xk == SystemDictionary::MemberName_klass()) { | |
260 // Note: This only works if the MemberName has already been resolved. | |
261 return decode_MemberName(x, receiver_limit_result, decode_flags_result); | |
262 } else if (java_dyn_MethodHandle::is_subclass(xk)) { | |
263 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result); | |
264 } else if (xk == SystemDictionary::reflect_method_klass()) { | |
265 oop clazz = java_lang_reflect_Method::clazz(x); | |
266 int slot = java_lang_reflect_Method::slot(x); | |
267 klassOop k = java_lang_Class::as_klassOop(clazz); | |
268 if (k != NULL && Klass::cast(k)->oop_is_instance()) | |
269 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), | |
270 decode_flags_result); | |
271 } else if (xk == SystemDictionary::reflect_constructor_klass()) { | |
272 oop clazz = java_lang_reflect_Constructor::clazz(x); | |
273 int slot = java_lang_reflect_Constructor::slot(x); | |
274 klassOop k = java_lang_Class::as_klassOop(clazz); | |
275 if (k != NULL && Klass::cast(k)->oop_is_instance()) | |
276 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), | |
277 decode_flags_result); | |
278 } else { | |
279 // unrecognized object | |
280 assert(!x->is_method(), "already checked"); | |
281 assert(!sun_dyn_MemberName::is_instance(x), "already checked"); | |
282 } | |
283 return NULL; | |
284 } | |
285 | |
286 | |
287 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) { | |
288 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass()) | |
289 return 0; // no push/pop | |
290 int this_vmslots = java_dyn_MethodHandle::vmslots(mh); | |
291 int last_vmslots = 0; | |
292 oop last_mh = mh; | |
293 for (;;) { | |
294 oop target = java_dyn_MethodHandle::vmtarget(last_mh); | |
295 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { | |
296 last_vmslots = java_dyn_MethodHandle::vmslots(target); | |
297 break; | |
298 } else if (!java_dyn_MethodHandle::is_instance(target)) { | |
299 // might be klass or method | |
300 assert(target->is_method(), "must get here with a direct ref to method"); | |
301 last_vmslots = methodOop(target)->size_of_parameters(); | |
302 break; | |
303 } | |
304 last_mh = target; | |
305 } | |
306 // If I am called with fewer VM slots than my ultimate callee, | |
307 // it must be that I push the additionally needed slots. | |
308 // Likewise if am called with more VM slots, I will pop them. | |
309 return (last_vmslots - this_vmslots); | |
310 } | |
311 | |
312 | |
313 // MemberName support | |
314 | |
315 // import sun_dyn_MemberName.* | |
316 enum { | |
317 IS_METHOD = sun_dyn_MemberName::MN_IS_METHOD, | |
318 IS_CONSTRUCTOR = sun_dyn_MemberName::MN_IS_CONSTRUCTOR, | |
319 IS_FIELD = sun_dyn_MemberName::MN_IS_FIELD, | |
320 IS_TYPE = sun_dyn_MemberName::MN_IS_TYPE, | |
321 SEARCH_SUPERCLASSES = sun_dyn_MemberName::MN_SEARCH_SUPERCLASSES, | |
322 SEARCH_INTERFACES = sun_dyn_MemberName::MN_SEARCH_INTERFACES, | |
323 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE, | |
324 VM_INDEX_UNINITIALIZED = sun_dyn_MemberName::VM_INDEX_UNINITIALIZED | |
325 }; | |
326 | |
327 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) { | |
328 if (target_oop->klass() == SystemDictionary::reflect_field_klass()) { | |
329 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() | |
330 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() | |
331 int mods = java_lang_reflect_Field::modifiers(target_oop); | |
332 klassOop k = java_lang_Class::as_klassOop(clazz); | |
333 int offset = instanceKlass::cast(k)->offset_from_fields(slot); | |
334 init_MemberName(mname_oop, k, accessFlags_from(mods), offset); | |
335 } else { | |
336 int decode_flags = 0; klassOop receiver_limit = NULL; | |
337 methodOop m = MethodHandles::decode_method(target_oop, | |
338 receiver_limit, decode_flags); | |
339 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); | |
340 init_MemberName(mname_oop, m, do_dispatch); | |
341 } | |
342 } | |
343 | |
344 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) { | |
345 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD) | |
346 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS )); | |
347 oop vmtarget = m; | |
348 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet | |
349 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound()) | |
350 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch | |
351 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value"); | |
352 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); | |
353 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); | |
354 sun_dyn_MemberName::set_flags(mname_oop, flags); | |
355 } | |
356 | |
357 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) { | |
358 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS )); | |
359 oop vmtarget = field_holder; | |
360 int vmindex = offset; // implies no info yet | |
361 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex"); | |
362 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); | |
363 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); | |
364 sun_dyn_MemberName::set_flags(mname_oop, flags); | |
365 } | |
366 | |
367 | |
368 methodOop MethodHandles::decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result) { | |
369 int flags = sun_dyn_MemberName::flags(mname); | |
370 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return NULL; // not invocable | |
371 oop vmtarget = sun_dyn_MemberName::vmtarget(mname); | |
372 int vmindex = sun_dyn_MemberName::vmindex(mname); | |
373 if (vmindex == VM_INDEX_UNINITIALIZED) return NULL; // not resolved | |
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374 methodOop m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result); |
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375 oop clazz = sun_dyn_MemberName::clazz(mname); |
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376 if (clazz != NULL && java_lang_Class::is_instance(clazz)) { |
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377 klassOop klass = java_lang_Class::as_klassOop(clazz); |
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378 if (klass != NULL) receiver_limit_result = klass; |
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379 } |
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380 return m; |
710 | 381 } |
382 | |
383 // An unresolved member name is a mere symbolic reference. | |
384 // Resolving it plants a vmtarget/vmindex in it, | |
385 // which refers dirctly to JVM internals. | |
386 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) { | |
387 assert(sun_dyn_MemberName::is_instance(mname()), ""); | |
388 #ifdef ASSERT | |
389 // If this assert throws, renegotiate the sentinel value used by the Java code, | |
390 // so that it is distinct from any valid vtable index value, and any special | |
391 // values defined in methodOopDesc::VtableIndexFlag. | |
392 // The point of the slop is to give the Java code and the JVM some room | |
393 // to independently specify sentinel values. | |
394 const int sentinel_slop = 10; | |
395 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop; | |
396 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels"); | |
397 #endif | |
398 if (sun_dyn_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED) | |
399 return; // already resolved | |
400 oop defc_oop = sun_dyn_MemberName::clazz(mname()); | |
401 oop name_str = sun_dyn_MemberName::name(mname()); | |
402 oop type_str = sun_dyn_MemberName::type(mname()); | |
403 int flags = sun_dyn_MemberName::flags(mname()); | |
404 | |
405 if (defc_oop == NULL || name_str == NULL || type_str == NULL) { | |
406 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve"); | |
407 } | |
408 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop); | |
409 defc_oop = NULL; // safety | |
410 if (defc_klassOop == NULL) return; // a primitive; no resolution possible | |
411 if (!Klass::cast(defc_klassOop)->oop_is_instance()) { | |
412 if (!Klass::cast(defc_klassOop)->oop_is_array()) return; | |
413 defc_klassOop = SystemDictionary::object_klass(); | |
414 } | |
415 instanceKlassHandle defc(THREAD, defc_klassOop); | |
416 defc_klassOop = NULL; // safety | |
417 if (defc.is_null()) { | |
418 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class"); | |
419 } | |
420 defc->link_class(CHECK); | |
421 | |
422 // convert the external string name to an internal symbol | |
423 symbolHandle name(THREAD, java_lang_String::as_symbol_or_null(name_str)); | |
424 if (name.is_null()) return; // no such name | |
425 name_str = NULL; // safety | |
426 | |
427 // convert the external string or reflective type to an internal signature | |
428 bool force_signature = (name() == vmSymbols::invoke_name()); | |
429 symbolHandle type; { | |
430 symbolOop type_sym = NULL; | |
431 if (java_dyn_MethodType::is_instance(type_str)) { | |
432 type_sym = java_dyn_MethodType::as_signature(type_str, force_signature, CHECK); | |
433 } else if (java_lang_Class::is_instance(type_str)) { | |
434 type_sym = java_lang_Class::as_signature(type_str, force_signature, CHECK); | |
435 } else if (java_lang_String::is_instance(type_str)) { | |
436 if (force_signature) { | |
437 type = java_lang_String::as_symbol(type_str, CHECK); | |
438 } else { | |
439 type_sym = java_lang_String::as_symbol_or_null(type_str); | |
440 } | |
441 } else { | |
442 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized type"); | |
443 } | |
444 if (type_sym != NULL) | |
445 type = symbolHandle(THREAD, type_sym); | |
446 } | |
447 if (type.is_null()) return; // no such signature exists in the VM | |
448 type_str = NULL; // safety | |
449 | |
450 // Time to do the lookup. | |
451 switch (flags & ALL_KINDS) { | |
452 case IS_METHOD: | |
453 { | |
454 CallInfo result; | |
455 { | |
456 EXCEPTION_MARK; | |
457 if ((flags & JVM_ACC_STATIC) != 0) { | |
458 LinkResolver::resolve_static_call(result, | |
459 defc, name, type, KlassHandle(), false, false, THREAD); | |
460 } else if (defc->is_interface()) { | |
461 LinkResolver::resolve_interface_call(result, Handle(), defc, | |
462 defc, name, type, KlassHandle(), false, false, THREAD); | |
463 } else { | |
464 LinkResolver::resolve_virtual_call(result, Handle(), defc, | |
465 defc, name, type, KlassHandle(), false, false, THREAD); | |
466 } | |
467 if (HAS_PENDING_EXCEPTION) { | |
468 CLEAR_PENDING_EXCEPTION; | |
469 return; | |
470 } | |
471 } | |
472 methodHandle m = result.resolved_method(); | |
473 oop vmtarget = NULL; | |
474 int vmindex = methodOopDesc::nonvirtual_vtable_index; | |
475 if (defc->is_interface()) { | |
476 vmindex = klassItable::compute_itable_index(m()); | |
477 assert(vmindex >= 0, ""); | |
478 } else if (result.has_vtable_index()) { | |
479 vmindex = result.vtable_index(); | |
480 assert(vmindex >= 0, ""); | |
481 } | |
482 assert(vmindex != VM_INDEX_UNINITIALIZED, ""); | |
483 if (vmindex < 0) { | |
484 assert(result.is_statically_bound(), ""); | |
485 vmtarget = m(); | |
486 } else { | |
487 vmtarget = result.resolved_klass()->as_klassOop(); | |
488 } | |
489 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); | |
490 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
491 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
492 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
493 DEBUG_ONLY(int junk; klassOop junk2); | |
494 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), | |
495 "properly stored for later decoding"); | |
496 return; | |
497 } | |
498 case IS_CONSTRUCTOR: | |
499 { | |
500 CallInfo result; | |
501 { | |
502 EXCEPTION_MARK; | |
503 if (name() == vmSymbols::object_initializer_name()) { | |
504 LinkResolver::resolve_special_call(result, | |
505 defc, name, type, KlassHandle(), false, THREAD); | |
506 } else { | |
507 break; // will throw after end of switch | |
508 } | |
509 if (HAS_PENDING_EXCEPTION) { | |
510 CLEAR_PENDING_EXCEPTION; | |
511 return; | |
512 } | |
513 } | |
514 assert(result.is_statically_bound(), ""); | |
515 methodHandle m = result.resolved_method(); | |
516 oop vmtarget = m(); | |
517 int vmindex = methodOopDesc::nonvirtual_vtable_index; | |
518 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); | |
519 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
520 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
521 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
522 DEBUG_ONLY(int junk; klassOop junk2); | |
523 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), | |
524 "properly stored for later decoding"); | |
525 return; | |
526 } | |
527 case IS_FIELD: | |
528 { | |
529 // This is taken from LinkResolver::resolve_field, sans access checks. | |
530 fieldDescriptor fd; // find_field initializes fd if found | |
531 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name(), type(), &fd)); | |
532 // check if field exists; i.e., if a klass containing the field def has been selected | |
533 if (sel_klass.is_null()) return; | |
534 oop vmtarget = sel_klass->as_klassOop(); | |
535 int vmindex = fd.offset(); | |
536 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS); | |
537 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen | |
538 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
539 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
540 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
541 return; | |
542 } | |
543 } | |
544 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); | |
545 } | |
546 | |
547 // Conversely, a member name which is only initialized from JVM internals | |
548 // may have null defc, name, and type fields. | |
549 // Resolving it plants a vmtarget/vmindex in it, | |
550 // which refers directly to JVM internals. | |
551 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { | |
552 assert(sun_dyn_MemberName::is_instance(mname()), ""); | |
553 oop vmtarget = sun_dyn_MemberName::vmtarget(mname()); | |
554 int vmindex = sun_dyn_MemberName::vmindex(mname()); | |
555 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) { | |
556 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); | |
557 } | |
558 | |
559 bool have_defc = (sun_dyn_MemberName::clazz(mname()) != NULL); | |
560 bool have_name = (sun_dyn_MemberName::name(mname()) != NULL); | |
561 bool have_type = (sun_dyn_MemberName::type(mname()) != NULL); | |
562 int flags = sun_dyn_MemberName::flags(mname()); | |
563 | |
564 if (suppress != 0) { | |
565 if (suppress & _suppress_defc) have_defc = true; | |
566 if (suppress & _suppress_name) have_name = true; | |
567 if (suppress & _suppress_type) have_type = true; | |
568 } | |
569 | |
570 if (have_defc && have_name && have_type) return; // nothing needed | |
571 | |
572 switch (flags & ALL_KINDS) { | |
573 case IS_METHOD: | |
574 case IS_CONSTRUCTOR: | |
575 { | |
576 klassOop receiver_limit = NULL; | |
577 int decode_flags = 0; | |
578 methodHandle m(THREAD, decode_vmtarget(vmtarget, vmindex, NULL, | |
579 receiver_limit, decode_flags)); | |
580 if (m.is_null()) break; | |
581 if (!have_defc) { | |
582 klassOop defc = m->method_holder(); | |
583 if (receiver_limit != NULL && receiver_limit != defc | |
584 && Klass::cast(receiver_limit)->is_subtype_of(defc)) | |
585 defc = receiver_limit; | |
586 sun_dyn_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror()); | |
587 } | |
588 if (!have_name) { | |
589 //not java_lang_String::create_from_symbol; let's intern member names | |
590 Handle name = StringTable::intern(m->name(), CHECK); | |
591 sun_dyn_MemberName::set_name(mname(), name()); | |
592 } | |
593 if (!have_type) { | |
594 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); | |
595 sun_dyn_MemberName::set_type(mname(), type()); | |
596 } | |
597 return; | |
598 } | |
599 case IS_FIELD: | |
600 { | |
601 // This is taken from LinkResolver::resolve_field, sans access checks. | |
602 if (!vmtarget->is_klass()) break; | |
603 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break; | |
604 instanceKlassHandle defc(THREAD, (klassOop) vmtarget); | |
605 bool is_static = ((flags & JVM_ACC_STATIC) != 0); | |
606 fieldDescriptor fd; // find_field initializes fd if found | |
607 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) | |
608 break; // cannot expand | |
609 if (!have_defc) { | |
610 sun_dyn_MemberName::set_clazz(mname(), defc->java_mirror()); | |
611 } | |
612 if (!have_name) { | |
613 //not java_lang_String::create_from_symbol; let's intern member names | |
614 Handle name = StringTable::intern(fd.name(), CHECK); | |
615 sun_dyn_MemberName::set_name(mname(), name()); | |
616 } | |
617 if (!have_type) { | |
618 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK); | |
619 sun_dyn_MemberName::set_type(mname(), type()); | |
620 } | |
621 return; | |
622 } | |
623 } | |
624 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); | |
625 } | |
626 | |
627 int MethodHandles::find_MemberNames(klassOop k, | |
628 symbolOop name, symbolOop sig, | |
629 int mflags, klassOop caller, | |
630 int skip, objArrayOop results) { | |
631 DEBUG_ONLY(No_Safepoint_Verifier nsv); | |
632 // this code contains no safepoints! | |
633 | |
634 // %%% take caller into account! | |
635 | |
636 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1; | |
637 | |
638 int rfill = 0, rlimit = results->length(), rskip = skip; | |
639 // overflow measurement: | |
640 int overflow = 0, overflow_limit = MAX2(1000, rlimit); | |
641 | |
642 int match_flags = mflags; | |
643 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); | |
644 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); | |
645 bool local_only = !(search_superc | search_intfc); | |
646 bool classes_only = false; | |
647 | |
648 if (name != NULL) { | |
649 if (name->utf8_length() == 0) return 0; // a match is not possible | |
650 } | |
651 if (sig != NULL) { | |
652 if (sig->utf8_length() == 0) return 0; // a match is not possible | |
653 if (sig->byte_at(0) == '(') | |
654 match_flags &= ~(IS_FIELD | IS_TYPE); | |
655 else | |
656 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); | |
657 } | |
658 | |
659 if ((match_flags & IS_TYPE) != 0) { | |
660 // NYI, and Core Reflection works quite well for this query | |
661 } | |
662 | |
663 if ((match_flags & IS_FIELD) != 0) { | |
664 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { | |
665 if (name != NULL && st.name() != name) | |
666 continue; | |
667 if (sig != NULL && st.signature() != sig) | |
668 continue; | |
669 // passed the filters | |
670 if (rskip > 0) { | |
671 --rskip; | |
672 } else if (rfill < rlimit) { | |
673 oop result = results->obj_at(rfill++); | |
674 if (!sun_dyn_MemberName::is_instance(result)) | |
675 return -99; // caller bug! | |
676 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset()); | |
677 } else if (++overflow >= overflow_limit) { | |
678 match_flags = 0; break; // got tired of looking at overflow | |
679 } | |
680 } | |
681 } | |
682 | |
683 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { | |
684 // watch out for these guys: | |
685 symbolOop init_name = vmSymbols::object_initializer_name(); | |
686 symbolOop clinit_name = vmSymbols::class_initializer_name(); | |
687 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> | |
688 bool negate_name_test = false; | |
689 // fix name so that it captures the intention of IS_CONSTRUCTOR | |
690 if (!(match_flags & IS_METHOD)) { | |
691 // constructors only | |
692 if (name == NULL) { | |
693 name = init_name; | |
694 } else if (name != init_name) { | |
695 return 0; // no constructors of this method name | |
696 } | |
697 } else if (!(match_flags & IS_CONSTRUCTOR)) { | |
698 // methods only | |
699 if (name == NULL) { | |
700 name = init_name; | |
701 negate_name_test = true; // if we see the name, we *omit* the entry | |
702 } else if (name == init_name) { | |
703 return 0; // no methods of this constructor name | |
704 } | |
705 } else { | |
706 // caller will accept either sort; no need to adjust name | |
707 } | |
708 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { | |
709 methodOop m = st.method(); | |
710 symbolOop m_name = m->name(); | |
711 if (m_name == clinit_name) | |
712 continue; | |
713 if (name != NULL && ((m_name != name) ^ negate_name_test)) | |
714 continue; | |
715 if (sig != NULL && m->signature() != sig) | |
716 continue; | |
717 // passed the filters | |
718 if (rskip > 0) { | |
719 --rskip; | |
720 } else if (rfill < rlimit) { | |
721 oop result = results->obj_at(rfill++); | |
722 if (!sun_dyn_MemberName::is_instance(result)) | |
723 return -99; // caller bug! | |
724 MethodHandles::init_MemberName(result, m, true); | |
725 } else if (++overflow >= overflow_limit) { | |
726 match_flags = 0; break; // got tired of looking at overflow | |
727 } | |
728 } | |
729 } | |
730 | |
731 // return number of elements we at leasted wanted to initialize | |
732 return rfill + overflow; | |
733 } | |
734 | |
735 | |
736 | |
737 | |
738 // Decode the vmtarget field of a method handle. | |
739 // Sanitize out methodOops, klassOops, and any other non-Java data. | |
740 // This is for debugging and reflection. | |
741 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) { | |
742 assert(java_dyn_MethodHandle::is_instance(mh()), "must be a MH"); | |
743 if (format == ETF_HANDLE_OR_METHOD_NAME) { | |
744 oop target = java_dyn_MethodHandle::vmtarget(mh()); | |
745 if (target == NULL) { | |
746 return NULL; // unformed MH | |
747 } | |
748 klassOop tklass = target->klass(); | |
749 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::object_klass())) { | |
750 return target; // target is another MH (or something else?) | |
751 } | |
752 } | |
753 if (format == ETF_DIRECT_HANDLE) { | |
754 oop target = mh(); | |
755 for (;;) { | |
756 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { | |
757 return target; | |
758 } | |
759 if (!java_dyn_MethodHandle::is_instance(target)){ | |
760 return NULL; // unformed MH | |
761 } | |
762 target = java_dyn_MethodHandle::vmtarget(target); | |
763 } | |
764 } | |
765 // cases of metadata in MH.vmtarget: | |
766 // - AMH can have methodOop for static invoke with bound receiver | |
767 // - DMH can have methodOop for static invoke (on variable receiver) | |
768 // - DMH can have klassOop for dispatched (non-static) invoke | |
769 klassOop receiver_limit = NULL; | |
770 int decode_flags = 0; | |
771 methodOop m = decode_MethodHandle(mh(), receiver_limit, decode_flags); | |
772 if (m == NULL) return NULL; | |
773 switch (format) { | |
774 case ETF_REFLECT_METHOD: | |
775 // same as jni_ToReflectedMethod: | |
776 if (m->is_initializer()) { | |
777 return Reflection::new_constructor(m, THREAD); | |
778 } else { | |
779 return Reflection::new_method(m, UseNewReflection, false, THREAD); | |
780 } | |
781 | |
782 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle | |
783 case ETF_METHOD_NAME: | |
784 { | |
785 if (SystemDictionary::MemberName_klass() == NULL) break; | |
786 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass()); | |
787 mname_klass->initialize(CHECK_NULL); | |
788 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); | |
789 sun_dyn_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED); | |
790 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); | |
791 init_MemberName(mname(), m, do_dispatch); | |
792 expand_MemberName(mname, 0, CHECK_NULL); | |
793 return mname(); | |
794 } | |
795 } | |
796 | |
797 // Unknown format code. | |
798 char msg[50]; | |
799 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format); | |
800 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg); | |
801 } | |
802 | |
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803 static const char* always_null_names[] = { |
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804 "java/lang/Void", |
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805 "java/lang/Null", |
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806 //"java/lang/Nothing", |
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807 "sun/dyn/empty/Empty", |
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808 NULL |
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809 }; |
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810 |
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811 static bool is_always_null_type(klassOop klass) { |
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812 if (!Klass::cast(klass)->oop_is_instance()) return false; |
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813 instanceKlass* ik = instanceKlass::cast(klass); |
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814 // Must be on the boot class path: |
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815 if (ik->class_loader() != NULL) return false; |
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816 // Check the name. |
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817 symbolOop name = ik->name(); |
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818 for (int i = 0; ; i++) { |
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819 const char* test_name = always_null_names[i]; |
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820 if (test_name == NULL) break; |
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821 if (name->equals(test_name, (int) strlen(test_name))) |
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822 return true; |
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823 } |
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824 return false; |
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825 } |
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826 |
710 | 827 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) { |
828 if (src == dst || dst == SystemDictionary::object_klass()) | |
829 return false; // quickest checks | |
830 Klass* srck = Klass::cast(src); | |
831 Klass* dstk = Klass::cast(dst); | |
832 if (dstk->is_interface()) { | |
833 // interface receivers can safely be viewed as untyped, | |
834 // because interface calls always include a dynamic check | |
835 //dstk = Klass::cast(SystemDictionary::object_klass()); | |
836 return false; | |
837 } | |
838 if (srck->is_interface()) { | |
839 // interface arguments must be viewed as untyped | |
840 //srck = Klass::cast(SystemDictionary::object_klass()); | |
841 return true; | |
842 } | |
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843 if (is_always_null_type(src)) { |
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844 // some source types are known to be never instantiated; |
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845 // they represent references which are always null |
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846 // such null references never fail to convert safely |
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847 return false; |
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848 } |
710 | 849 return !srck->is_subclass_of(dstk->as_klassOop()); |
850 } | |
851 | |
852 static oop object_java_mirror() { | |
853 return Klass::cast(SystemDictionary::object_klass())->java_mirror(); | |
854 } | |
855 | |
856 bool MethodHandles::same_basic_type_for_arguments(BasicType src, | |
857 BasicType dst, | |
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858 bool raw, |
710 | 859 bool for_return) { |
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860 if (for_return) { |
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861 // return values can always be forgotten: |
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862 if (dst == T_VOID) return true; |
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863 if (src == T_VOID) return raw && (dst == T_INT); |
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864 // We allow caller to receive a garbage int, which is harmless. |
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865 // This trick is pulled by trusted code (see VerifyType.canPassRaw). |
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866 } |
710 | 867 assert(src != T_VOID && dst != T_VOID, "should not be here"); |
868 if (src == dst) return true; | |
869 if (type2size[src] != type2size[dst]) return false; | |
870 // allow reinterpretation casts for integral widening | |
871 if (is_subword_type(src)) { // subwords can fit in int or other subwords | |
872 if (dst == T_INT) // any subword fits in an int | |
873 return true; | |
874 if (src == T_BOOLEAN) // boolean fits in any subword | |
875 return is_subword_type(dst); | |
876 if (src == T_BYTE && dst == T_SHORT) | |
877 return true; // remaining case: byte fits in short | |
878 } | |
879 // allow float/fixed reinterpretation casts | |
880 if (src == T_FLOAT) return dst == T_INT; | |
881 if (src == T_INT) return dst == T_FLOAT; | |
882 if (src == T_DOUBLE) return dst == T_LONG; | |
883 if (src == T_LONG) return dst == T_DOUBLE; | |
884 return false; | |
885 } | |
886 | |
887 const char* MethodHandles::check_method_receiver(methodOop m, | |
888 klassOop passed_recv_type) { | |
889 assert(!m->is_static(), "caller resp."); | |
890 if (passed_recv_type == NULL) | |
891 return "receiver type is primitive"; | |
892 if (class_cast_needed(passed_recv_type, m->method_holder())) { | |
893 Klass* formal = Klass::cast(m->method_holder()); | |
894 return SharedRuntime::generate_class_cast_message("receiver type", | |
895 formal->external_name()); | |
896 } | |
897 return NULL; // checks passed | |
898 } | |
899 | |
900 // Verify that m's signature can be called type-safely by a method handle | |
901 // of the given method type 'mtype'. | |
902 // It takes a TRAPS argument because it must perform symbol lookups. | |
903 void MethodHandles::verify_method_signature(methodHandle m, | |
904 Handle mtype, | |
905 int first_ptype_pos, | |
906 KlassHandle insert_ptype, | |
907 TRAPS) { | |
908 objArrayHandle ptypes(THREAD, java_dyn_MethodType::ptypes(mtype())); | |
909 int pnum = first_ptype_pos; | |
910 int pmax = ptypes->length(); | |
911 int mnum = 0; // method argument | |
912 const char* err = NULL; | |
913 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) { | |
914 oop ptype_oop = NULL; | |
915 if (ss.at_return_type()) { | |
916 if (pnum != pmax) | |
917 { err = "too many arguments"; break; } | |
918 ptype_oop = java_dyn_MethodType::rtype(mtype()); | |
919 } else { | |
920 if (pnum >= pmax) | |
921 { err = "not enough arguments"; break; } | |
922 if (pnum >= 0) | |
923 ptype_oop = ptypes->obj_at(pnum); | |
924 else if (insert_ptype.is_null()) | |
925 ptype_oop = NULL; | |
926 else | |
927 ptype_oop = insert_ptype->java_mirror(); | |
928 pnum += 1; | |
929 mnum += 1; | |
930 } | |
931 klassOop mklass = NULL; | |
932 BasicType mtype = ss.type(); | |
933 if (mtype == T_ARRAY) mtype = T_OBJECT; // fold all refs to T_OBJECT | |
934 if (mtype == T_OBJECT) { | |
935 if (ptype_oop == NULL) { | |
936 // null matches any reference | |
937 continue; | |
938 } | |
939 // If we fail to resolve types at this point, we will throw an error. | |
940 symbolOop name_oop = ss.as_symbol(CHECK); | |
941 symbolHandle name(THREAD, name_oop); | |
942 instanceKlass* mk = instanceKlass::cast(m->method_holder()); | |
943 Handle loader(THREAD, mk->class_loader()); | |
944 Handle domain(THREAD, mk->protection_domain()); | |
945 mklass = SystemDictionary::resolve_or_fail(name, loader, domain, | |
946 true, CHECK); | |
947 } | |
948 if (ptype_oop == NULL) { | |
949 // null does not match any non-reference; use Object to report the error | |
950 ptype_oop = object_java_mirror(); | |
951 } | |
952 klassOop pklass = NULL; | |
953 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass); | |
954 if (!ss.at_return_type()) { | |
955 err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum); | |
956 } else { | |
957 err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal! | |
958 } | |
959 if (err != NULL) break; | |
960 } | |
961 | |
962 if (err != NULL) { | |
963 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
964 } | |
965 } | |
966 | |
967 // Main routine for verifying the MethodHandle.type of a proposed | |
968 // direct or bound-direct method handle. | |
969 void MethodHandles::verify_method_type(methodHandle m, | |
970 Handle mtype, | |
971 bool has_bound_recv, | |
972 KlassHandle bound_recv_type, | |
973 TRAPS) { | |
974 bool m_needs_receiver = !m->is_static(); | |
975 | |
976 const char* err = NULL; | |
977 | |
978 int first_ptype_pos = m_needs_receiver ? 1 : 0; | |
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979 if (has_bound_recv) { |
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980 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them |
710 | 981 if (m_needs_receiver && bound_recv_type.is_null()) |
982 { err = "bound receiver is not an object"; goto die; } | |
983 } | |
984 | |
985 if (m_needs_receiver && err == NULL) { | |
986 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype()); | |
987 if (ptypes->length() < first_ptype_pos) | |
988 { err = "receiver argument is missing"; goto die; } | |
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989 if (has_bound_recv) |
710 | 990 err = check_method_receiver(m(), bound_recv_type->as_klassOop()); |
991 else | |
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992 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1))); |
710 | 993 if (err != NULL) goto die; |
994 } | |
995 | |
996 // Check the other arguments for mistypes. | |
997 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK); | |
998 return; | |
999 | |
1000 die: | |
1001 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
1002 } | |
1003 | |
1004 void MethodHandles::verify_vmslots(Handle mh, TRAPS) { | |
1005 // Verify vmslots. | |
1006 int check_slots = argument_slot_count(java_dyn_MethodHandle::type(mh())); | |
1007 if (java_dyn_MethodHandle::vmslots(mh()) != check_slots) { | |
1008 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH"); | |
1009 } | |
1010 } | |
1011 | |
1012 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) { | |
1013 // Verify that argslot points at the given argnum. | |
1014 int check_slot = argument_slot(java_dyn_MethodHandle::type(mh()), argnum); | |
1015 if (argslot != check_slot || argslot < 0) { | |
1016 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d"; | |
1017 size_t msglen = strlen(fmt) + 3*11 + 1; | |
1018 char* msg = NEW_RESOURCE_ARRAY(char, msglen); | |
1019 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot); | |
1020 THROW_MSG(vmSymbols::java_lang_InternalError(), msg); | |
1021 } | |
1022 } | |
1023 | |
1024 // Verify the correspondence between two method types. | |
1025 // Apart from the advertised changes, caller method type X must | |
1026 // be able to invoke the callee method Y type with no violations | |
1027 // of type integrity. | |
1028 // Return NULL if all is well, else a short error message. | |
1029 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end, | |
1030 int insert_argnum, oop insert_type, | |
1031 int change_argnum, oop change_type, | |
1032 int delete_argnum, | |
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1033 oop dst_mtype, int dst_beg, int dst_end, |
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1034 bool raw) { |
710 | 1035 objArrayOop src_ptypes = java_dyn_MethodType::ptypes(src_mtype); |
1036 objArrayOop dst_ptypes = java_dyn_MethodType::ptypes(dst_mtype); | |
1037 | |
1038 int src_max = src_ptypes->length(); | |
1039 int dst_max = dst_ptypes->length(); | |
1040 | |
1041 if (src_end == -1) src_end = src_max; | |
1042 if (dst_end == -1) dst_end = dst_max; | |
1043 | |
1044 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob"); | |
1045 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob"); | |
1046 | |
1047 // pending actions; set to -1 when done: | |
1048 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum; | |
1049 | |
1050 const char* err = NULL; | |
1051 | |
1052 // Walk along each array of parameter types, including a virtual | |
1053 // NULL end marker at the end of each. | |
1054 for (int src_idx = src_beg, dst_idx = dst_beg; | |
1055 (src_idx <= src_end && dst_idx <= dst_end); | |
1056 src_idx++, dst_idx++) { | |
1057 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx); | |
1058 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx); | |
1059 bool fix_null_src_type = false; | |
1060 | |
1061 // Perform requested edits. | |
1062 if (ins_idx == src_idx) { | |
1063 // note that the inserted guy is never affected by a change or deletion | |
1064 ins_idx = -1; | |
1065 src_type = insert_type; | |
1066 fix_null_src_type = true; | |
1067 --src_idx; // back up to process src type on next loop | |
1068 src_idx = src_end; | |
1069 } else { | |
1070 // note that the changed guy can be immediately deleted | |
1071 if (chg_idx == src_idx) { | |
1072 chg_idx = -1; | |
1073 assert(src_idx < src_end, "oob"); | |
1074 src_type = change_type; | |
1075 fix_null_src_type = true; | |
1076 } | |
1077 if (del_idx == src_idx) { | |
1078 del_idx = -1; | |
1079 assert(src_idx < src_end, "oob"); | |
1080 --dst_idx; | |
1081 continue; // rerun loop after skipping this position | |
1082 } | |
1083 } | |
1084 | |
1085 if (src_type == NULL && fix_null_src_type) | |
1086 // explicit null in this case matches any dest reference | |
1087 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type); | |
1088 | |
1089 // Compare the two argument types. | |
1090 if (src_type != dst_type) { | |
1091 if (src_type == NULL) return "not enough arguments"; | |
1092 if (dst_type == NULL) return "too many arguments"; | |
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1093 err = check_argument_type_change(src_type, dst_type, dst_idx, raw); |
710 | 1094 if (err != NULL) return err; |
1095 } | |
1096 } | |
1097 | |
1098 // Now compare return types also. | |
1099 oop src_rtype = java_dyn_MethodType::rtype(src_mtype); | |
1100 oop dst_rtype = java_dyn_MethodType::rtype(dst_mtype); | |
1101 if (src_rtype != dst_rtype) { | |
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1102 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal! |
710 | 1103 if (err != NULL) return err; |
1104 } | |
1105 | |
1106 assert(err == NULL, ""); | |
1107 return NULL; // all is well | |
1108 } | |
1109 | |
1110 | |
1111 const char* MethodHandles::check_argument_type_change(BasicType src_type, | |
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1112 klassOop src_klass, |
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1113 BasicType dst_type, |
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1114 klassOop dst_klass, |
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1115 int argnum, |
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1116 bool raw) { |
710 | 1117 const char* err = NULL; |
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1118 bool for_return = (argnum < 0); |
710 | 1119 |
1120 // just in case: | |
1121 if (src_type == T_ARRAY) src_type = T_OBJECT; | |
1122 if (dst_type == T_ARRAY) dst_type = T_OBJECT; | |
1123 | |
1124 // Produce some nice messages if VerifyMethodHandles is turned on: | |
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1125 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) { |
710 | 1126 if (src_type == T_OBJECT) { |
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1127 if (raw && dst_type == T_INT && is_always_null_type(src_klass)) |
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1128 return NULL; // OK to convert a null pointer to a garbage int |
710 | 1129 err = ((argnum >= 0) |
1130 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s" | |
1131 : "type mismatch: returning a %s, but caller expects primitive %s"); | |
1132 } else if (dst_type == T_OBJECT) { | |
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1133 err = ((argnum >= 0) |
710 | 1134 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s" |
1135 : "type mismatch: returning a primitive %s, but caller expects %s"); | |
1136 } else { | |
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1137 err = ((argnum >= 0) |
710 | 1138 ? "type mismatch: passing a %s for method argument #%d, which expects %s" |
1139 : "type mismatch: returning a %s, but caller expects %s"); | |
1140 } | |
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1141 } else if (src_type == T_OBJECT && dst_type == T_OBJECT && |
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1142 class_cast_needed(src_klass, dst_klass)) { |
710 | 1143 if (!class_cast_needed(dst_klass, src_klass)) { |
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1144 if (raw) |
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1145 return NULL; // reverse cast is OK; the MH target is trusted to enforce it |
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1146 err = ((argnum >= 0) |
710 | 1147 ? "cast required: passing a %s for method argument #%d, which expects %s" |
1148 : "cast required: returning a %s, but caller expects %s"); | |
1149 } else { | |
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1150 err = ((argnum >= 0) |
710 | 1151 ? "reference mismatch: passing a %s for method argument #%d, which expects %s" |
1152 : "reference mismatch: returning a %s, but caller expects %s"); | |
1153 } | |
1154 } else { | |
1155 // passed the obstacle course | |
1156 return NULL; | |
1157 } | |
1158 | |
1159 // format, format, format | |
1160 const char* src_name = type2name(src_type); | |
1161 const char* dst_name = type2name(dst_type); | |
1162 if (src_type == T_OBJECT) src_name = Klass::cast(src_klass)->external_name(); | |
1163 if (dst_type == T_OBJECT) dst_name = Klass::cast(dst_klass)->external_name(); | |
1164 if (src_name == NULL) src_name = "unknown type"; | |
1165 if (dst_name == NULL) dst_name = "unknown type"; | |
1166 | |
1167 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11); | |
1168 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1); | |
1169 if (argnum >= 0) { | |
1170 assert(strstr(err, "%d") != NULL, ""); | |
1171 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name); | |
1172 } else { | |
1173 assert(strstr(err, "%d") == NULL, ""); | |
1174 jio_snprintf(msg, msglen, err, src_name, dst_name); | |
1175 } | |
1176 return msg; | |
1177 } | |
1178 | |
1179 // Compute the depth within the stack of the given argument, i.e., | |
1180 // the combined size of arguments to the right of the given argument. | |
1181 // For the last argument (ptypes.length-1) this will be zero. | |
1182 // For the first argument (0) this will be the size of all | |
1183 // arguments but that one. For the special number -1, this | |
1184 // will be the size of all arguments, including the first. | |
1185 // If the argument is neither -1 nor a valid argument index, | |
1186 // then return a negative number. Otherwise, the result | |
1187 // is in the range [0..vmslots] inclusive. | |
1188 int MethodHandles::argument_slot(oop method_type, int arg) { | |
1189 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); | |
1190 int argslot = 0; | |
1191 int len = ptypes->length(); | |
1192 if (arg < -1 || arg >= len) return -99; | |
1193 for (int i = len-1; i > arg; i--) { | |
1194 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); | |
1195 argslot += type2size[bt]; | |
1196 } | |
1197 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works"); | |
1198 return argslot; | |
1199 } | |
1200 | |
1201 // Given a slot number, return the argument number. | |
1202 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) { | |
1203 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); | |
1204 int argslot = 0; | |
1205 int len = ptypes->length(); | |
1206 for (int i = len-1; i >= 0; i--) { | |
1207 if (query_argslot == argslot) return i; | |
1208 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); | |
1209 argslot += type2size[bt]; | |
1210 } | |
1211 // return pseudo-arg deepest in stack: | |
1212 if (query_argslot == argslot) return -1; | |
1213 return -99; // oob slot, or splitting a double-slot arg | |
1214 } | |
1215 | |
1216 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m, | |
1217 KlassHandle receiver_limit, | |
1218 int decode_flags, | |
1219 KlassHandle receiver_klass, | |
1220 TRAPS) { | |
1221 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference"); | |
1222 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument"); | |
1223 | |
1224 if (!m->is_static() && | |
1225 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder()))) | |
1226 // given type does not match class of method, or receiver is null! | |
1227 // caller should have checked this, but let's be extra careful... | |
1228 return methodHandle(); | |
1229 | |
1230 if (receiver_limit.not_null() && | |
1231 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit()))) | |
1232 // given type is not limited to the receiver type | |
1233 // note that a null receiver can match any reference value, for a static method | |
1234 return methodHandle(); | |
1235 | |
1236 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) { | |
1237 // pre-dispatched or static method (null receiver is OK for static) | |
1238 return m; | |
1239 | |
1240 } else if (receiver_klass.is_null()) { | |
1241 // null receiver value; cannot dispatch | |
1242 return methodHandle(); | |
1243 | |
1244 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) { | |
1245 // perform virtual dispatch | |
1246 int vtable_index = m->vtable_index(); | |
1247 guarantee(vtable_index >= 0, "valid vtable index"); | |
1248 | |
1249 // receiver_klass might be an arrayKlassOop but all vtables start at | |
1250 // the same place. The cast is to avoid virtual call and assertion. | |
1251 // See also LinkResolver::runtime_resolve_virtual_method. | |
1252 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass()); | |
1253 DEBUG_ONLY(inst->verify_vtable_index(vtable_index)); | |
1254 methodOop m_oop = inst->method_at_vtable(vtable_index); | |
1255 return methodHandle(THREAD, m_oop); | |
1256 | |
1257 } else { | |
1258 // perform interface dispatch | |
1259 int itable_index = klassItable::compute_itable_index(m()); | |
1260 guarantee(itable_index >= 0, "valid itable index"); | |
1261 instanceKlass* inst = instanceKlass::cast(receiver_klass()); | |
1262 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD); | |
1263 return methodHandle(THREAD, m_oop); | |
1264 } | |
1265 } | |
1266 | |
1267 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) { | |
1268 // Verify type. | |
1269 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1270 verify_method_type(m, mtype, false, KlassHandle(), CHECK); | |
1271 | |
1272 // Verify vmslots. | |
1273 if (java_dyn_MethodHandle::vmslots(mh()) != m->size_of_parameters()) { | |
1274 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH"); | |
1275 } | |
1276 } | |
1277 | |
1278 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) { | |
1279 // Check arguments. | |
1280 if (mh.is_null() || m.is_null() || | |
1281 (!do_dispatch && m->is_abstract())) { | |
1282 THROW(vmSymbols::java_lang_InternalError()); | |
1283 } | |
1284 | |
1285 java_dyn_MethodHandle::init_vmslots(mh()); | |
1286 | |
1287 if (VerifyMethodHandles) { | |
1288 // The privileged code which invokes this routine should not make | |
1289 // a mistake about types, but it's better to verify. | |
1290 verify_DirectMethodHandle(mh, m, CHECK); | |
1291 } | |
1292 | |
1293 // Finally, after safety checks are done, link to the target method. | |
1294 // We will follow the same path as the latter part of | |
1295 // InterpreterRuntime::resolve_invoke(), which first finds the method | |
1296 // and then decides how to populate the constant pool cache entry | |
1297 // that links the interpreter calls to the method. We need the same | |
1298 // bits, and will use the same calling sequence code. | |
1299 | |
1300 int vmindex = methodOopDesc::garbage_vtable_index; | |
1301 oop vmtarget = NULL; | |
1302 | |
1303 instanceKlass::cast(m->method_holder())->link_class(CHECK); | |
1304 | |
1305 MethodHandleEntry* me = NULL; | |
1306 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) { | |
1307 // We are simulating an invokeinterface instruction. | |
1308 // (We might also be simulating an invokevirtual on a miranda method, | |
1309 // but it is safe to treat it as an invokeinterface.) | |
1310 assert(!m->can_be_statically_bound(), "no final methods on interfaces"); | |
1311 vmindex = klassItable::compute_itable_index(m()); | |
1312 assert(vmindex >= 0, "(>=0) == do_dispatch"); | |
1313 // Set up same bits as ConstantPoolCacheEntry::set_interface_call(). | |
1314 vmtarget = m->method_holder(); // the interface | |
1315 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh); | |
1316 } else if (!do_dispatch || m->can_be_statically_bound()) { | |
1317 // We are simulating an invokestatic or invokespecial instruction. | |
1318 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method(). | |
1319 vmtarget = m(); | |
1320 // this does not help dispatch, but it will make it possible to parse this MH: | |
1321 vmindex = methodOopDesc::nonvirtual_vtable_index; | |
1322 assert(vmindex < 0, "(>=0) == do_dispatch"); | |
1323 if (!m->is_static()) { | |
1324 me = MethodHandles::entry(MethodHandles::_invokespecial_mh); | |
1325 } else { | |
1326 me = MethodHandles::entry(MethodHandles::_invokestatic_mh); | |
1327 // Part of the semantics of a static call is an initialization barrier. | |
1328 // For a DMH, it is done now, when the handle is created. | |
1329 Klass* k = Klass::cast(m->method_holder()); | |
1330 if (k->should_be_initialized()) { | |
1331 k->initialize(CHECK); | |
1332 } | |
1333 } | |
1334 } else { | |
1335 // We are simulating an invokevirtual instruction. | |
1336 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method(). | |
1337 // The key logic is LinkResolver::runtime_resolve_virtual_method. | |
1338 vmindex = m->vtable_index(); | |
1339 vmtarget = m->method_holder(); | |
1340 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh); | |
1341 } | |
1342 | |
1343 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
1344 | |
1345 sun_dyn_DirectMethodHandle::set_vmtarget(mh(), vmtarget); | |
1346 sun_dyn_DirectMethodHandle::set_vmindex(mh(), vmindex); | |
1347 DEBUG_ONLY(int flags; klassOop rlimit); | |
1348 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(), | |
1349 "properly stored for later decoding"); | |
1350 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0)); | |
1351 assert(!(actual_do_dispatch && !do_dispatch), | |
1352 "do not perform dispatch if !do_dispatch specified"); | |
1353 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch"); | |
1354 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack"); | |
1355 | |
1356 // Done! | |
1357 java_dyn_MethodHandle::set_vmentry(mh(), me); | |
1358 } | |
1359 | |
1360 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh, | |
1361 methodHandle m, | |
1362 TRAPS) { | |
1363 // Verify type. | |
1364 oop receiver = sun_dyn_BoundMethodHandle::argument(mh()); | |
1365 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1366 KlassHandle bound_recv_type; | |
1367 if (receiver != NULL) bound_recv_type = KlassHandle(THREAD, receiver->klass()); | |
1368 verify_method_type(m, mtype, true, bound_recv_type, CHECK); | |
1369 | |
1370 int receiver_pos = m->size_of_parameters() - 1; | |
1371 | |
1372 // Verify MH.vmargslot, which should point at the bound receiver. | |
1373 verify_vmargslot(mh, -1, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); | |
1374 //verify_vmslots(mh, CHECK); | |
1375 | |
1376 // Verify vmslots. | |
1377 if (java_dyn_MethodHandle::vmslots(mh()) != receiver_pos) { | |
1378 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)"); | |
1379 } | |
1380 } | |
1381 | |
1382 // Initialize a BMH with a receiver bound directly to a methodOop. | |
1383 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh, | |
1384 methodHandle original_m, | |
1385 KlassHandle receiver_limit, | |
1386 int decode_flags, | |
1387 TRAPS) { | |
1388 // Check arguments. | |
1389 if (mh.is_null() || original_m.is_null()) { | |
1390 THROW(vmSymbols::java_lang_InternalError()); | |
1391 } | |
1392 | |
1393 KlassHandle receiver_klass; | |
1394 { | |
1395 oop receiver_oop = sun_dyn_BoundMethodHandle::argument(mh()); | |
1396 if (receiver_oop != NULL) | |
1397 receiver_klass = KlassHandle(THREAD, receiver_oop->klass()); | |
1398 } | |
1399 methodHandle m = dispatch_decoded_method(original_m, | |
1400 receiver_limit, decode_flags, | |
1401 receiver_klass, | |
1402 CHECK); | |
1403 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); } | |
1404 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); } | |
1405 | |
1406 java_dyn_MethodHandle::init_vmslots(mh()); | |
1407 | |
1408 if (VerifyMethodHandles) { | |
1409 verify_BoundMethodHandle_with_receiver(mh, m, CHECK); | |
1410 } | |
1411 | |
1412 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); | |
1413 | |
1414 DEBUG_ONLY(int junk; klassOop junk2); | |
1415 assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding"); | |
1416 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot"); | |
1417 | |
1418 // Done! | |
1419 java_dyn_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh)); | |
1420 } | |
1421 | |
1422 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum, | |
1423 bool direct_to_method, TRAPS) { | |
1424 Handle ptype_handle(THREAD, | |
1425 java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum)); | |
1426 KlassHandle ptype_klass; | |
1427 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass); | |
1428 int slots_pushed = type2size[ptype]; | |
1429 | |
1430 oop argument = sun_dyn_BoundMethodHandle::argument(mh()); | |
1431 | |
1432 const char* err = NULL; | |
1433 | |
1434 switch (ptype) { | |
1435 case T_OBJECT: | |
1436 if (argument != NULL) | |
1437 // we must implicitly convert from the arg type to the outgoing ptype | |
1438 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum); | |
1439 break; | |
1440 | |
1441 case T_ARRAY: case T_VOID: | |
1442 assert(false, "array, void do not appear here"); | |
1443 default: | |
1444 if (ptype != T_INT && !is_subword_type(ptype)) { | |
1445 err = "unexpected parameter type"; | |
1446 break; | |
1447 } | |
1448 // check subrange of Integer.value, if necessary | |
1449 if (argument == NULL || argument->klass() != SystemDictionary::int_klass()) { | |
1450 err = "bound integer argument must be of type java.lang.Integer"; | |
1451 break; | |
1452 } | |
1453 if (ptype != T_INT) { | |
1454 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT); | |
1455 jint value = argument->int_field(value_offset); | |
1456 int vminfo = adapter_subword_vminfo(ptype); | |
1457 jint subword = truncate_subword_from_vminfo(value, vminfo); | |
1458 if (value != subword) { | |
1459 err = "bound subword value does not fit into the subword type"; | |
1460 break; | |
1461 } | |
1462 } | |
1463 break; | |
1464 case T_FLOAT: | |
1465 case T_DOUBLE: | |
1466 case T_LONG: | |
1467 { | |
1468 // we must implicitly convert from the unboxed arg type to the outgoing ptype | |
1469 BasicType argbox = java_lang_boxing_object::basic_type(argument); | |
1470 if (argbox != ptype) { | |
1471 err = check_argument_type_change(T_OBJECT, (argument == NULL | |
1472 ? SystemDictionary::object_klass() | |
1473 : argument->klass()), | |
1474 ptype, ptype_klass(), argnum); | |
1475 assert(err != NULL, "this must be an error"); | |
1476 } | |
1477 break; | |
1478 } | |
1479 } | |
1480 | |
1481 if (err == NULL) { | |
1482 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); | |
1483 if (direct_to_method) { | |
1484 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots"); | |
1485 assert(slots_pushed <= MethodHandlePushLimit, ""); | |
1486 } else { | |
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1487 int target_pushes = decode_MethodHandle_stack_pushes(target()); |
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1488 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct"); |
710 | 1489 // do not blow the stack; use a Java-based adapter if this limit is exceeded |
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1490 if (slots_pushed + target_pushes > MethodHandlePushLimit) |
710 | 1491 err = "too many bound parameters"; |
1492 } | |
1493 } | |
1494 | |
1495 if (err == NULL) { | |
1496 // Verify the rest of the method type. | |
1497 err = check_method_type_insertion(java_dyn_MethodHandle::type(mh()), | |
1498 argnum, ptype_handle(), | |
1499 java_dyn_MethodHandle::type(target())); | |
1500 } | |
1501 | |
1502 if (err != NULL) { | |
1503 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
1504 } | |
1505 } | |
1506 | |
1507 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { | |
1508 // Check arguments. | |
1509 if (mh.is_null() || target.is_null() || !java_dyn_MethodHandle::is_instance(target())) { | |
1510 THROW(vmSymbols::java_lang_InternalError()); | |
1511 } | |
1512 | |
1513 java_dyn_MethodHandle::init_vmslots(mh()); | |
1514 | |
1515 if (VerifyMethodHandles) { | |
1516 int insert_after = argnum - 1; | |
1517 verify_vmargslot(mh, insert_after, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); | |
1518 verify_vmslots(mh, CHECK); | |
1519 } | |
1520 | |
1521 // If (a) the target is a direct non-dispatched method handle, | |
1522 // or (b) the target is a dispatched direct method handle and we | |
1523 // are binding the receiver, cut out the middle-man. | |
1524 // Do this by decoding the DMH and using its methodOop directly as vmtarget. | |
1525 bool direct_to_method = false; | |
1526 if (OptimizeMethodHandles && | |
1527 target->klass() == SystemDictionary::DirectMethodHandle_klass() && | |
1528 (argnum == 0 || sun_dyn_DirectMethodHandle::vmindex(target()) < 0)) { | |
1529 int decode_flags = 0; klassOop receiver_limit_oop = NULL; | |
1530 methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags)); | |
1531 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); } | |
1532 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - 1); // pos. of 1st arg. | |
1533 assert(sun_dyn_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig"); | |
1534 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) { | |
1535 KlassHandle receiver_limit(THREAD, receiver_limit_oop); | |
1536 init_BoundMethodHandle_with_receiver(mh, m, | |
1537 receiver_limit, decode_flags, | |
1538 CHECK); | |
1539 return; | |
1540 } | |
1541 | |
1542 // Even if it is not a bound receiver, we still might be able | |
1543 // to bind another argument and still invoke the methodOop directly. | |
1544 if (!(decode_flags & _dmf_does_dispatch)) { | |
1545 direct_to_method = true; | |
1546 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); | |
1547 } | |
1548 } | |
1549 if (!direct_to_method) | |
1550 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), target()); | |
1551 | |
1552 if (VerifyMethodHandles) { | |
1553 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK); | |
1554 } | |
1555 | |
1556 // Next question: Is this a ref, int, or long bound value? | |
1557 oop ptype_oop = java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum); | |
1558 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop); | |
1559 int slots_pushed = type2size[ptype]; | |
1560 | |
1561 MethodHandleEntry* me = NULL; | |
1562 if (ptype == T_OBJECT) { | |
1563 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh); | |
1564 else me = MethodHandles::entry(_bound_ref_mh); | |
1565 } else if (slots_pushed == 2) { | |
1566 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh); | |
1567 else me = MethodHandles::entry(_bound_long_mh); | |
1568 } else if (slots_pushed == 1) { | |
1569 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh); | |
1570 else me = MethodHandles::entry(_bound_int_mh); | |
1571 } else { | |
1572 assert(false, ""); | |
1573 } | |
1574 | |
1575 // Done! | |
1576 java_dyn_MethodHandle::set_vmentry(mh(), me); | |
1577 } | |
1578 | |
1579 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) { | |
1580 char msg[200]; | |
1581 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err); | |
1582 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg); | |
1583 } | |
1584 | |
1585 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) { | |
1586 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); | |
1587 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); | |
1588 | |
1589 verify_vmargslot(mh, argnum, argslot, CHECK); | |
1590 verify_vmslots(mh, CHECK); | |
1591 | |
1592 jint conv_op = adapter_conversion_op(conversion); | |
1593 if (!conv_op_valid(conv_op)) { | |
1594 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD); | |
1595 return; | |
1596 } | |
1597 EntryKind ek = adapter_entry_kind(conv_op); | |
1598 | |
1599 int stack_move = adapter_conversion_stack_move(conversion); | |
1600 BasicType src = adapter_conversion_src_type(conversion); | |
1601 BasicType dest = adapter_conversion_dest_type(conversion); | |
1602 int vminfo = adapter_conversion_vminfo(conversion); // should be zero | |
1603 | |
1604 Handle argument(THREAD, sun_dyn_AdapterMethodHandle::argument(mh())); | |
1605 Handle target(THREAD, sun_dyn_AdapterMethodHandle::vmtarget(mh())); | |
1606 Handle src_mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1607 Handle dst_mtype(THREAD, java_dyn_MethodHandle::type(target())); | |
1608 | |
1609 const char* err = NULL; | |
1610 | |
1611 if (err == NULL) { | |
1612 // Check that the correct argument is supplied, but only if it is required. | |
1613 switch (ek) { | |
1614 case _adapter_check_cast: // target type of cast | |
1615 case _adapter_ref_to_prim: // wrapper type from which to unbox | |
1616 case _adapter_prim_to_ref: // wrapper type to box into | |
1617 case _adapter_collect_args: // array type to collect into | |
1618 case _adapter_spread_args: // array type to spread from | |
1619 if (!java_lang_Class::is_instance(argument()) | |
1620 || java_lang_Class::is_primitive(argument())) | |
1621 { err = "adapter requires argument of type java.lang.Class"; break; } | |
1622 if (ek == _adapter_collect_args || | |
1623 ek == _adapter_spread_args) { | |
1624 // Make sure it is a suitable collection type. (Array, for now.) | |
1625 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument())); | |
1626 if (!ak->oop_is_objArray()) { | |
1627 { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; } | |
1628 } | |
1629 } | |
1630 break; | |
1631 case _adapter_flyby: | |
1632 case _adapter_ricochet: | |
1633 if (!java_dyn_MethodHandle::is_instance(argument())) | |
1634 { err = "MethodHandle adapter argument required"; break; } | |
1635 break; | |
1636 default: | |
1637 if (argument.not_null()) | |
1638 { err = "adapter has spurious argument"; break; } | |
1639 break; | |
1640 } | |
1641 } | |
1642 | |
1643 if (err == NULL) { | |
1644 // Check that the src/dest types are supplied if needed. | |
1645 switch (ek) { | |
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1646 case _adapter_check_cast: |
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1647 if (src != T_OBJECT || dest != T_OBJECT) { |
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1648 err = "adapter requires object src/dest conversion subfields"; |
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1649 } |
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1650 break; |
710 | 1651 case _adapter_prim_to_prim: |
1652 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) { | |
1653 err = "adapter requires primitive src/dest conversion subfields"; break; | |
1654 } | |
1655 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) || | |
1656 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) { | |
1657 err = "adapter cannot convert beween floating and fixed-point"; break; | |
1658 } | |
1659 break; | |
1660 case _adapter_ref_to_prim: | |
1661 if (src != T_OBJECT || !is_java_primitive(dest) | |
1662 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) { | |
1663 err = "adapter requires primitive dest conversion subfield"; break; | |
1664 } | |
1665 break; | |
1666 case _adapter_prim_to_ref: | |
1667 if (!is_java_primitive(src) || dest != T_OBJECT | |
1668 || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) { | |
1669 err = "adapter requires primitive src conversion subfield"; break; | |
1670 } | |
1671 break; | |
1672 case _adapter_swap_args: | |
1673 case _adapter_rot_args: | |
1674 { | |
1675 if (!src || src != dest) { | |
1676 err = "adapter requires src/dest conversion subfields for swap"; break; | |
1677 } | |
1678 int swap_size = type2size[src]; | |
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1679 oop src_mtype = sun_dyn_AdapterMethodHandle::type(mh()); |
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1680 oop dest_mtype = sun_dyn_AdapterMethodHandle::type(target()); |
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1681 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(target()); |
710 | 1682 int src_slot = argslot; |
1683 int dest_slot = vminfo; | |
1684 bool rotate_up = (src_slot > dest_slot); // upward rotation | |
1685 int src_arg = argnum; | |
1686 int dest_arg = argument_slot_to_argnum(dest_mtype, dest_slot); | |
1687 verify_vmargslot(mh, dest_arg, dest_slot, CHECK); | |
1688 if (!(dest_slot >= src_slot + swap_size) && | |
1689 !(src_slot >= dest_slot + swap_size)) { | |
1690 err = "source, destination slots must be distinct"; | |
1691 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) { | |
1692 err = "source of swap must be deeper in stack"; | |
1693 } else if (ek == _adapter_swap_args) { | |
1694 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, dest_arg), | |
1695 java_dyn_MethodType::ptype(dest_mtype, src_arg), | |
1696 dest_arg); | |
1697 } else if (ek == _adapter_rot_args) { | |
1698 if (rotate_up) { | |
1699 assert((src_slot > dest_slot) && (src_arg < dest_arg), ""); | |
1700 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot] | |
1701 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1] | |
1702 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) { | |
1703 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), | |
1704 java_dyn_MethodType::ptype(dest_mtype, i-1), | |
1705 i); | |
1706 } | |
1707 } else { // rotate down | |
1708 assert((src_slot < dest_slot) && (src_arg > dest_arg), ""); | |
1709 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss] | |
1710 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg] | |
1711 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) { | |
1712 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), | |
1713 java_dyn_MethodType::ptype(dest_mtype, i+1), | |
1714 i); | |
1715 } | |
1716 } | |
1717 } | |
1718 if (err == NULL) | |
1719 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, src_arg), | |
1720 java_dyn_MethodType::ptype(dest_mtype, dest_arg), | |
1721 src_arg); | |
1722 } | |
1723 break; | |
1724 case _adapter_collect_args: | |
1725 case _adapter_spread_args: | |
1726 { | |
1727 BasicType coll_type = (ek == _adapter_collect_args) ? dest : src; | |
1728 BasicType elem_type = (ek == _adapter_collect_args) ? src : dest; | |
1729 if (coll_type != T_OBJECT || elem_type != T_OBJECT) { | |
1730 err = "adapter requires src/dest subfields"; break; | |
1731 // later: | |
1732 // - consider making coll be a primitive array | |
1733 // - consider making coll be a heterogeneous collection | |
1734 } | |
1735 } | |
1736 break; | |
1737 default: | |
1738 if (src != 0 || dest != 0) { | |
1739 err = "adapter has spurious src/dest conversion subfields"; break; | |
1740 } | |
1741 break; | |
1742 } | |
1743 } | |
1744 | |
1745 if (err == NULL) { | |
1746 // Check the stack_move subfield. | |
1747 // It must always report the net change in stack size, positive or negative. | |
1748 int slots_pushed = stack_move / stack_move_unit(); | |
1749 switch (ek) { | |
1750 case _adapter_prim_to_prim: | |
1751 case _adapter_ref_to_prim: | |
1752 case _adapter_prim_to_ref: | |
1753 if (slots_pushed != type2size[dest] - type2size[src]) { | |
1754 err = "wrong stack motion for primitive conversion"; | |
1755 } | |
1756 break; | |
1757 case _adapter_dup_args: | |
1758 if (slots_pushed <= 0) { | |
1759 err = "adapter requires conversion subfield slots_pushed > 0"; | |
1760 } | |
1761 break; | |
1762 case _adapter_drop_args: | |
1763 if (slots_pushed >= 0) { | |
1764 err = "adapter requires conversion subfield slots_pushed < 0"; | |
1765 } | |
1766 break; | |
1767 case _adapter_collect_args: | |
1768 if (slots_pushed > 1) { | |
1769 err = "adapter requires conversion subfield slots_pushed <= 1"; | |
1770 } | |
1771 break; | |
1772 case _adapter_spread_args: | |
1773 if (slots_pushed < -1) { | |
1774 err = "adapter requires conversion subfield slots_pushed >= -1"; | |
1775 } | |
1776 break; | |
1777 default: | |
1778 if (stack_move != 0) { | |
1779 err = "adapter has spurious stack_move conversion subfield"; | |
1780 } | |
1781 break; | |
1782 } | |
1783 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) { | |
1784 err = "stack_move conversion subfield must be multiple of stack_move_unit"; | |
1785 } | |
1786 } | |
1787 | |
1788 if (err == NULL) { | |
1789 // Make sure this adapter does not push too deeply. | |
1790 int slots_pushed = stack_move / stack_move_unit(); | |
1791 int this_vmslots = java_dyn_MethodHandle::vmslots(mh()); | |
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1792 int target_vmslots = java_dyn_MethodHandle::vmslots(target()); |
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1793 if (slots_pushed != (target_vmslots - this_vmslots)) { |
710 | 1794 err = "stack_move inconsistent with previous and current MethodType vmslots"; |
1795 } else if (slots_pushed > 0) { | |
1796 // verify stack_move against MethodHandlePushLimit | |
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1797 int target_pushes = decode_MethodHandle_stack_pushes(target()); |
710 | 1798 // do not blow the stack; use a Java-based adapter if this limit is exceeded |
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1799 if (slots_pushed + target_pushes > MethodHandlePushLimit) { |
710 | 1800 err = "adapter pushes too many parameters"; |
1801 } | |
1802 } | |
1803 | |
1804 // While we're at it, check that the stack motion decoder works: | |
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1805 DEBUG_ONLY(int target_pushes = decode_MethodHandle_stack_pushes(target())); |
710 | 1806 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); |
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1807 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct"); |
710 | 1808 } |
1809 | |
1810 if (err == NULL && vminfo != 0) { | |
1811 switch (ek) { | |
1812 case _adapter_swap_args: | |
1813 case _adapter_rot_args: | |
1814 break; // OK | |
1815 default: | |
1816 err = "vminfo subfield is reserved to the JVM"; | |
1817 } | |
1818 } | |
1819 | |
1820 // Do additional ad hoc checks. | |
1821 if (err == NULL) { | |
1822 switch (ek) { | |
1823 case _adapter_retype_only: | |
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1824 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false); |
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1825 break; |
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1826 |
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1827 case _adapter_retype_raw: |
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1828 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true); |
710 | 1829 break; |
1830 | |
1831 case _adapter_check_cast: | |
1832 { | |
1833 // The actual value being checked must be a reference: | |
1834 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype(), argnum), | |
1835 object_java_mirror(), argnum); | |
1836 if (err != NULL) break; | |
1837 | |
1838 // The output of the cast must fit with the destination argument: | |
1839 Handle cast_class = argument; | |
1840 err = check_method_type_conversion(src_mtype(), | |
1841 argnum, cast_class(), | |
1842 dst_mtype()); | |
1843 } | |
1844 break; | |
1845 | |
1846 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles | |
1847 } | |
1848 } | |
1849 | |
1850 if (err != NULL) { | |
1851 throw_InternalError_for_bad_conversion(conversion, err, THREAD); | |
1852 return; | |
1853 } | |
1854 | |
1855 } | |
1856 | |
1857 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { | |
1858 oop argument = sun_dyn_AdapterMethodHandle::argument(mh()); | |
1859 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); | |
1860 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); | |
1861 jint conv_op = adapter_conversion_op(conversion); | |
1862 | |
1863 // adjust the adapter code to the internal EntryKind enumeration: | |
1864 EntryKind ek_orig = adapter_entry_kind(conv_op); | |
1865 EntryKind ek_opt = ek_orig; // may be optimized | |
1866 | |
1867 // Finalize the vmtarget field (Java initialized it to null). | |
1868 if (!java_dyn_MethodHandle::is_instance(target())) { | |
1869 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD); | |
1870 return; | |
1871 } | |
1872 sun_dyn_AdapterMethodHandle::set_vmtarget(mh(), target()); | |
1873 | |
1874 if (VerifyMethodHandles) { | |
1875 verify_AdapterMethodHandle(mh, argnum, CHECK); | |
1876 } | |
1877 | |
1878 int stack_move = adapter_conversion_stack_move(conversion); | |
1879 BasicType src = adapter_conversion_src_type(conversion); | |
1880 BasicType dest = adapter_conversion_dest_type(conversion); | |
1881 int vminfo = adapter_conversion_vminfo(conversion); // should be zero | |
1882 | |
1883 const char* err = NULL; | |
1884 | |
1885 // Now it's time to finish the case analysis and pick a MethodHandleEntry. | |
1886 switch (ek_orig) { | |
1887 case _adapter_retype_only: | |
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1888 case _adapter_retype_raw: |
710 | 1889 case _adapter_check_cast: |
1890 case _adapter_dup_args: | |
1891 case _adapter_drop_args: | |
1892 // these work fine via general case code | |
1893 break; | |
1894 | |
1895 case _adapter_prim_to_prim: | |
1896 { | |
1897 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}. | |
1898 // And, the {float,double} -> {int,long} cases must be handled by Java. | |
1899 switch (type2size[src] *4+ type2size[dest]) { | |
1900 case 1 *4+ 1: | |
1901 assert(src == T_INT || is_subword_type(src), "source is not float"); | |
1902 // Subword-related cases are int -> {boolean,byte,char,short}. | |
1903 ek_opt = _adapter_opt_i2i; | |
1904 vminfo = adapter_subword_vminfo(dest); | |
1905 break; | |
1906 case 2 *4+ 1: | |
1907 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) { | |
1908 ek_opt = _adapter_opt_l2i; | |
1909 vminfo = adapter_subword_vminfo(dest); | |
1910 } else if (src == T_DOUBLE && dest == T_FLOAT) { | |
1911 ek_opt = _adapter_opt_d2f; | |
1912 } else { | |
1913 assert(false, ""); | |
1914 } | |
1915 break; | |
1916 case 1 *4+ 2: | |
1917 if (src == T_INT && dest == T_LONG) { | |
1918 ek_opt = _adapter_opt_i2l; | |
1919 } else if (src == T_FLOAT && dest == T_DOUBLE) { | |
1920 ek_opt = _adapter_opt_f2d; | |
1921 } else { | |
1922 assert(false, ""); | |
1923 } | |
1924 break; | |
1925 default: | |
1926 assert(false, ""); | |
1927 break; | |
1928 } | |
1929 } | |
1930 break; | |
1931 | |
1932 case _adapter_ref_to_prim: | |
1933 { | |
1934 switch (type2size[dest]) { | |
1935 case 1: | |
1936 ek_opt = _adapter_opt_unboxi; | |
1937 vminfo = adapter_subword_vminfo(dest); | |
1938 break; | |
1939 case 2: | |
1940 ek_opt = _adapter_opt_unboxl; | |
1941 break; | |
1942 default: | |
1943 assert(false, ""); | |
1944 break; | |
1945 } | |
1946 } | |
1947 break; | |
1948 | |
1949 case _adapter_prim_to_ref: | |
1950 goto throw_not_impl; // allocates, hence could block | |
1951 | |
1952 case _adapter_swap_args: | |
1953 case _adapter_rot_args: | |
1954 { | |
1955 int swap_slots = type2size[src]; | |
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1956 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(mh()); |
710 | 1957 int src_slot = argslot; |
1958 int dest_slot = vminfo; | |
1959 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1; | |
1960 switch (swap_slots) { | |
1961 case 1: | |
1962 ek_opt = (!rotate ? _adapter_opt_swap_1 : | |
1963 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down); | |
1964 break; | |
1965 case 2: | |
1966 ek_opt = (!rotate ? _adapter_opt_swap_2 : | |
1967 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down); | |
1968 break; | |
1969 default: | |
1970 assert(false, ""); | |
1971 break; | |
1972 } | |
1973 } | |
1974 break; | |
1975 | |
1976 case _adapter_collect_args: | |
1977 goto throw_not_impl; // allocates, hence could block | |
1978 | |
1979 case _adapter_spread_args: | |
1980 { | |
1981 // vminfo will be the required length of the array | |
1982 int slots_pushed = stack_move / stack_move_unit(); | |
1983 int array_size = slots_pushed + 1; | |
1984 assert(array_size >= 0, ""); | |
1985 vminfo = array_size; | |
1986 switch (array_size) { | |
1987 case 0: ek_opt = _adapter_opt_spread_0; break; | |
1988 case 1: ek_opt = _adapter_opt_spread_1; break; | |
1989 default: ek_opt = _adapter_opt_spread_more; break; | |
1990 } | |
1991 if ((vminfo & CONV_VMINFO_MASK) != vminfo) | |
1992 goto throw_not_impl; // overflow | |
1993 } | |
1994 break; | |
1995 | |
1996 case _adapter_flyby: | |
1997 case _adapter_ricochet: | |
1998 goto throw_not_impl; // runs Java code, hence could block | |
1999 | |
2000 default: | |
2001 // should have failed much earlier; must be a missing case here | |
2002 assert(false, "incomplete switch"); | |
2003 // and fall through: | |
2004 | |
2005 throw_not_impl: | |
2006 // FIXME: these adapters are NYI | |
2007 err = "adapter not yet implemented in the JVM"; | |
2008 break; | |
2009 } | |
2010 | |
2011 if (err != NULL) { | |
2012 throw_InternalError_for_bad_conversion(conversion, err, THREAD); | |
2013 return; | |
2014 } | |
2015 | |
2016 // Rebuild the conversion value; maybe parts of it were changed. | |
2017 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo); | |
2018 | |
2019 // Finalize the conversion field. (Note that it is final to Java code.) | |
2020 sun_dyn_AdapterMethodHandle::set_conversion(mh(), new_conversion); | |
2021 | |
2022 // Done! | |
2023 java_dyn_MethodHandle::set_vmentry(mh(), entry(ek_opt)); | |
2024 | |
2025 // There should be enough memory barriers on exit from native methods | |
2026 // to ensure that the MH is fully initialized to all threads before | |
2027 // Java code can publish it in global data structures. | |
2028 } | |
2029 | |
2030 // | |
2031 // Here are the native methods on sun.dyn.MethodHandleImpl. | |
2032 // They are the private interface between this JVM and the HotSpot-specific | |
2033 // Java code that implements JSR 292 method handles. | |
2034 // | |
2035 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way | |
2036 // that intrinsic (non-JNI) native methods are defined in HotSpot. | |
2037 // | |
2038 | |
2039 // direct method handles for invokestatic or invokespecial | |
2040 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller); | |
2041 JVM_ENTRY(void, MHI_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
2042 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) { | |
2043 ResourceMark rm; // for error messages | |
2044 | |
2045 // This is the guy we are initializing: | |
2046 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2047 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
2048 | |
2049 // Early returns out of this method leave the DMH in an unfinished state. | |
2050 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
2051 | |
2052 // which method are we really talking about? | |
2053 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2054 oop target_oop = JNIHandles::resolve_non_null(target_jh); | |
2055 if (sun_dyn_MemberName::is_instance(target_oop) && | |
2056 sun_dyn_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) { | |
2057 Handle mname(THREAD, target_oop); | |
2058 MethodHandles::resolve_MemberName(mname, CHECK); | |
2059 target_oop = mname(); // in case of GC | |
2060 } | |
2061 | |
2062 int decode_flags = 0; klassOop receiver_limit = NULL; | |
2063 methodHandle m(THREAD, | |
2064 MethodHandles::decode_method(target_oop, | |
2065 receiver_limit, decode_flags)); | |
2066 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); } | |
2067 | |
2068 // The trusted Java code that calls this method should already have performed | |
2069 // access checks on behalf of the given caller. But, we can verify this. | |
2070 if (VerifyMethodHandles && caller_jh != NULL) { | |
2071 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh))); | |
2072 // If this were a bytecode, the first access check would be against | |
2073 // the "reference class" mentioned in the CONSTANT_Methodref. | |
2074 // For that class, we use the defining class of m, | |
2075 // or a more specific receiver limit if available. | |
2076 klassOop reference_klass = m->method_holder(); // OK approximation | |
2077 if (receiver_limit != NULL && receiver_limit != reference_klass) { | |
2078 if (!Klass::cast(receiver_limit)->is_subtype_of(reference_klass)) | |
2079 THROW_MSG(vmSymbols::java_lang_InternalError(), "receiver limit out of bounds"); // Java code bug | |
2080 reference_klass = receiver_limit; | |
2081 } | |
2082 // Emulate LinkResolver::check_klass_accessability. | |
2083 if (!Reflection::verify_class_access(caller->as_klassOop(), | |
2084 reference_klass, | |
2085 true)) { | |
2086 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(m->method_holder())->external_name()); | |
2087 } | |
2088 // If there were a bytecode, the next step would be to lookup the method | |
2089 // in the reference class, then then check the method's access bits. | |
2090 // Emulate LinkResolver::check_method_accessability. | |
2091 klassOop resolved_klass = m->method_holder(); | |
2092 if (!Reflection::verify_field_access(caller->as_klassOop(), | |
2093 resolved_klass, reference_klass, | |
2094 m->access_flags(), | |
2095 true)) { | |
2096 // %%% following cutout belongs in Reflection::verify_field_access? | |
2097 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(), | |
2098 reference_klass, THREAD); | |
2099 if (!same_pm) { | |
2100 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string()); | |
2101 } | |
2102 } | |
2103 } | |
2104 | |
2105 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK); | |
2106 } | |
2107 JVM_END | |
2108 | |
2109 // bound method handles | |
2110 JVM_ENTRY(void, MHI_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
2111 jobject target_jh, int argnum)) { | |
2112 ResourceMark rm; // for error messages | |
2113 | |
2114 // This is the guy we are initializing: | |
2115 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2116 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
2117 | |
2118 // Early returns out of this method leave the BMH in an unfinished state. | |
2119 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
2120 | |
2121 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2122 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); | |
2123 | |
2124 if (!java_dyn_MethodHandle::is_instance(target())) { | |
2125 // Target object is a reflective method. (%%% Do we need this alternate path?) | |
2126 Untested("init_BMH of non-MH"); | |
2127 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); } | |
2128 int decode_flags = 0; klassOop receiver_limit_oop = NULL; | |
2129 methodHandle m(THREAD, | |
2130 MethodHandles::decode_method(target(), | |
2131 receiver_limit_oop, | |
2132 decode_flags)); | |
2133 KlassHandle receiver_limit(THREAD, receiver_limit_oop); | |
2134 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m, | |
2135 receiver_limit, | |
2136 decode_flags, | |
2137 CHECK); | |
2138 return; | |
2139 } | |
2140 | |
2141 // Build a BMH on top of a DMH or another BMH: | |
2142 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK); | |
2143 } | |
2144 JVM_END | |
2145 | |
2146 // adapter method handles | |
2147 JVM_ENTRY(void, MHI_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
2148 jobject target_jh, int argnum)) { | |
2149 // This is the guy we are initializing: | |
2150 if (mh_jh == NULL || target_jh == NULL) { | |
2151 THROW(vmSymbols::java_lang_InternalError()); | |
2152 } | |
2153 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
2154 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); | |
2155 | |
2156 // Early returns out of this method leave the AMH in an unfinished state. | |
2157 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
2158 | |
2159 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK); | |
2160 } | |
2161 JVM_END | |
2162 | |
2163 // method type forms | |
2164 JVM_ENTRY(void, MHI_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) { | |
2165 if (erased_jh == NULL) return; | |
2166 if (TraceMethodHandles) { | |
2167 tty->print("creating MethodType form "); | |
2168 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH! | |
2169 // call Object.toString() | |
2170 symbolOop name = vmSymbols::toString_name(), sig = vmSymbols::void_string_signature(); | |
2171 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh))); | |
2172 JavaValue result(T_OBJECT); | |
2173 JavaCalls::call_virtual(&result, SystemDictionary::object_klass(), name, sig, | |
2174 &args, CHECK); | |
2175 Handle str(THREAD, (oop)result.get_jobject()); | |
2176 java_lang_String::print(str, tty); | |
2177 } | |
2178 tty->cr(); | |
2179 } | |
2180 } | |
2181 JVM_END | |
2182 | |
2183 // debugging and reflection | |
2184 JVM_ENTRY(jobject, MHI_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) { | |
2185 Handle mh(THREAD, JNIHandles::resolve(mh_jh)); | |
2186 if (!java_dyn_MethodHandle::is_instance(mh())) { | |
2187 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); | |
2188 } | |
2189 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL); | |
2190 return JNIHandles::make_local(THREAD, target); | |
2191 } | |
2192 JVM_END | |
2193 | |
2194 JVM_ENTRY(jint, MHI_getConstant(JNIEnv *env, jobject igcls, jint which)) { | |
2195 switch (which) { | |
2196 case MethodHandles::GC_JVM_PUSH_LIMIT: | |
2197 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF, | |
2198 "MethodHandlePushLimit parameter must be in valid range"); | |
2199 return MethodHandlePushLimit; | |
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2200 case MethodHandles::GC_JVM_STACK_MOVE_UNIT: |
710 | 2201 // return number of words per slot, signed according to stack direction |
2202 return MethodHandles::stack_move_unit(); | |
2203 } | |
2204 return 0; | |
2205 } | |
2206 JVM_END | |
2207 | |
2208 #ifndef PRODUCT | |
2209 #define EACH_NAMED_CON(template) \ | |
2210 template(MethodHandles,GC_JVM_PUSH_LIMIT) \ | |
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2211 template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) \ |
710 | 2212 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \ |
2213 template(MethodHandles,ETF_DIRECT_HANDLE) \ | |
2214 template(MethodHandles,ETF_METHOD_NAME) \ | |
2215 template(MethodHandles,ETF_REFLECT_METHOD) \ | |
2216 template(sun_dyn_MemberName,MN_IS_METHOD) \ | |
2217 template(sun_dyn_MemberName,MN_IS_CONSTRUCTOR) \ | |
2218 template(sun_dyn_MemberName,MN_IS_FIELD) \ | |
2219 template(sun_dyn_MemberName,MN_IS_TYPE) \ | |
2220 template(sun_dyn_MemberName,MN_SEARCH_SUPERCLASSES) \ | |
2221 template(sun_dyn_MemberName,MN_SEARCH_INTERFACES) \ | |
2222 template(sun_dyn_MemberName,VM_INDEX_UNINITIALIZED) \ | |
2223 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_ONLY) \ | |
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2224 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_RAW) \ |
710 | 2225 template(sun_dyn_AdapterMethodHandle,OP_CHECK_CAST) \ |
2226 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_PRIM) \ | |
2227 template(sun_dyn_AdapterMethodHandle,OP_REF_TO_PRIM) \ | |
2228 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_REF) \ | |
2229 template(sun_dyn_AdapterMethodHandle,OP_SWAP_ARGS) \ | |
2230 template(sun_dyn_AdapterMethodHandle,OP_ROT_ARGS) \ | |
2231 template(sun_dyn_AdapterMethodHandle,OP_DUP_ARGS) \ | |
2232 template(sun_dyn_AdapterMethodHandle,OP_DROP_ARGS) \ | |
2233 template(sun_dyn_AdapterMethodHandle,OP_COLLECT_ARGS) \ | |
2234 template(sun_dyn_AdapterMethodHandle,OP_SPREAD_ARGS) \ | |
2235 template(sun_dyn_AdapterMethodHandle,OP_FLYBY) \ | |
2236 template(sun_dyn_AdapterMethodHandle,OP_RICOCHET) \ | |
2237 template(sun_dyn_AdapterMethodHandle,CONV_OP_LIMIT) \ | |
2238 template(sun_dyn_AdapterMethodHandle,CONV_OP_MASK) \ | |
2239 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_MASK) \ | |
2240 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_SHIFT) \ | |
2241 template(sun_dyn_AdapterMethodHandle,CONV_OP_SHIFT) \ | |
2242 template(sun_dyn_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \ | |
2243 template(sun_dyn_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \ | |
2244 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \ | |
2245 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \ | |
2246 /*end*/ | |
2247 | |
2248 #define ONE_PLUS(scope,value) 1+ | |
2249 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0; | |
2250 #define VALUE_COMMA(scope,value) scope::value, | |
2251 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 }; | |
2252 #define STRING_NULL(scope,value) #value "\0" | |
2253 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) }; | |
2254 | |
2255 #undef ONE_PLUS | |
2256 #undef VALUE_COMMA | |
2257 #undef STRING_NULL | |
2258 #undef EACH_NAMED_CON | |
2259 #endif | |
2260 | |
2261 JVM_ENTRY(jint, MHI_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { | |
2262 #ifndef PRODUCT | |
2263 if (which >= 0 && which < con_value_count) { | |
2264 int con = con_values[which]; | |
2265 objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh); | |
2266 if (box != NULL && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { | |
2267 const char* str = &con_names[0]; | |
2268 for (int i = 0; i < which; i++) | |
2269 str += strlen(str) + 1; // skip name and null | |
2270 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); | |
2271 box->obj_at_put(0, name); | |
2272 } | |
2273 return con; | |
2274 } | |
2275 #endif | |
2276 return 0; | |
2277 } | |
2278 JVM_END | |
2279 | |
2280 // void init(MemberName self, AccessibleObject ref) | |
2281 JVM_ENTRY(void, MHI_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { | |
2282 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2283 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
2284 oop target_oop = JNIHandles::resolve_non_null(target_jh); | |
2285 MethodHandles::init_MemberName(mname(), target_oop); | |
2286 } | |
2287 JVM_END | |
2288 | |
2289 // void expand(MemberName self) | |
2290 JVM_ENTRY(void, MHI_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { | |
2291 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2292 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
2293 MethodHandles::expand_MemberName(mname, 0, CHECK); | |
2294 } | |
2295 JVM_END | |
2296 | |
2297 // void resolve(MemberName self, Class<?> caller) | |
2298 JVM_ENTRY(void, MHI_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { | |
2299 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2300 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
2301 // %%% take caller into account! | |
2302 MethodHandles::resolve_MemberName(mname, CHECK); | |
2303 } | |
2304 JVM_END | |
2305 | |
2306 // static native int getMembers(Class<?> defc, String matchName, String matchSig, | |
2307 // int matchFlags, Class<?> caller, int skip, MemberName[] results); | |
2308 JVM_ENTRY(jint, MHI_getMembers(JNIEnv *env, jobject igcls, | |
2309 jclass clazz_jh, jstring name_jh, jstring sig_jh, | |
2310 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { | |
2311 if (clazz_jh == NULL || results_jh == NULL) return -1; | |
2312 klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)); | |
2313 | |
2314 objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh); | |
2315 if (results == NULL || !results->is_objArray()) return -1; | |
2316 | |
2317 symbolOop name = NULL, sig = NULL; | |
2318 if (name_jh != NULL) { | |
2319 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); | |
2320 if (name == NULL) return 0; // a match is not possible | |
2321 } | |
2322 if (sig_jh != NULL) { | |
2323 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); | |
2324 if (sig == NULL) return 0; // a match is not possible | |
2325 } | |
2326 | |
2327 klassOop caller = NULL; | |
2328 if (caller_jh != NULL) { | |
2329 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); | |
2330 if (!java_lang_Class::is_instance(caller_oop)) return -1; | |
2331 caller = java_lang_Class::as_klassOop(caller_oop); | |
2332 } | |
2333 | |
2334 if (name != NULL && sig != NULL && results != NULL) { | |
2335 // try a direct resolve | |
2336 // %%% TO DO | |
2337 } | |
2338 | |
2339 int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags, | |
2340 caller, skip, results); | |
2341 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks | |
2342 return res; | |
2343 } | |
2344 JVM_END | |
2345 | |
2346 | |
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2347 JVM_ENTRY(void, MH_linkCallSite(JNIEnv *env, jobject igcls, jobject site_jh, jobject target_jh)) { |
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2348 // No special action required, yet. |
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2349 oop site_oop = JNIHandles::resolve(site_jh); |
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2350 if (site_oop == NULL || site_oop->klass() != SystemDictionary::CallSiteImpl_klass()) |
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2351 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "call site"); |
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2352 sun_dyn_CallSiteImpl::set_target(site_oop, JNIHandles::resolve(target_jh)); |
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2353 } |
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2354 JVM_END |
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2355 |
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2356 |
710 | 2357 /// JVM_RegisterMethodHandleMethods |
2358 | |
2359 #define ADR "J" | |
2360 | |
2361 #define LANG "Ljava/lang/" | |
2362 #define JDYN "Ljava/dyn/" | |
2363 #define IDYN "Lsun/dyn/" | |
2364 | |
2365 #define OBJ LANG"Object;" | |
2366 #define CLS LANG"Class;" | |
2367 #define STRG LANG"String;" | |
2368 #define MT JDYN"MethodType;" | |
2369 #define MH JDYN"MethodHandle;" | |
2370 #define MHI IDYN"MethodHandleImpl;" | |
2371 #define MEM IDYN"MemberName;" | |
2372 #define AMH IDYN"AdapterMethodHandle;" | |
2373 #define BMH IDYN"BoundMethodHandle;" | |
2374 #define DMH IDYN"DirectMethodHandle;" | |
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2375 #define CSTI IDYN"CallSiteImpl;" |
710 | 2376 |
2377 #define CC (char*) /*cast a literal from (const char*)*/ | |
2378 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) | |
2379 | |
2380 // These are the native methods on sun.dyn.MethodHandleNatives. | |
2381 static JNINativeMethod methods[] = { | |
2382 // void init(MemberName self, AccessibleObject ref) | |
2383 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHI_init_AMH)}, | |
2384 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHI_init_BMH)}, | |
2385 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHI_init_DMH)}, | |
2386 {CC"init", CC"("MT")V", FN_PTR(MHI_init_MT)}, | |
2387 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHI_init_Mem)}, | |
2388 {CC"expand", CC"("MEM")V", FN_PTR(MHI_expand_Mem)}, | |
2389 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHI_resolve_Mem)}, | |
2390 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHI_getTarget)}, | |
2391 {CC"getConstant", CC"(I)I", FN_PTR(MHI_getConstant)}, | |
2392 // static native int getNamedCon(int which, Object[] name) | |
2393 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHI_getNamedCon)}, | |
2394 // static native int getMembers(Class<?> defc, String matchName, String matchSig, | |
2395 // int matchFlags, Class<?> caller, int skip, MemberName[] results); | |
2396 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHI_getMembers)} | |
2397 }; | |
2398 | |
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2399 // More entry points specifically for EnableInvokeDynamic. |
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2400 static JNINativeMethod methods2[] = { |
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2401 {CC"linkCallSite", CC"("CSTI MH")V", FN_PTR(MH_linkCallSite)} |
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2402 }; |
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2403 |
710 | 2404 |
2405 // This one function is exported, used by NativeLookup. | |
2406 | |
2407 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { | |
2408 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK"); | |
2409 | |
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2410 // note: this explicit warning-producing stuff will be replaced by auto-detection of the JSR 292 classes |
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2411 |
710 | 2412 if (!EnableMethodHandles) { |
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2413 warning("JSR 292 method handles are disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableMethodHandles to enable."); |
710 | 2414 return; // bind nothing |
2415 } | |
2416 | |
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2417 bool enable_MH = true; |
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2418 |
710 | 2419 { |
2420 ThreadToNativeFromVM ttnfv(thread); | |
2421 | |
2422 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod)); | |
2423 if (env->ExceptionOccurred()) { | |
2424 MethodHandles::set_enabled(false); | |
2425 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); | |
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2426 enable_MH = false; |
710 | 2427 env->ExceptionClear(); |
2428 } | |
2429 } | |
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2430 |
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2431 if (enable_MH) { |
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2432 KlassHandle MHI_klass = SystemDictionaryHandles::MethodHandleImpl_klass(); |
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2433 if (MHI_klass.not_null()) { |
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2434 symbolHandle raiseException_name = oopFactory::new_symbol_handle("raiseException", CHECK); |
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2435 symbolHandle raiseException_sig = oopFactory::new_symbol_handle("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK); |
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2436 methodOop raiseException_method = instanceKlass::cast(MHI_klass->as_klassOop()) |
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2437 ->find_method(raiseException_name(), raiseException_sig()); |
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2438 if (raiseException_method != NULL && raiseException_method->is_static()) { |
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2439 MethodHandles::set_raise_exception_method(raiseException_method); |
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2440 } else { |
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2441 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); |
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2442 enable_MH = false; |
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2443 } |
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2444 } |
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2445 } |
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2446 |
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2447 if (enable_MH) { |
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2448 MethodHandles::set_enabled(true); |
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2449 } |
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2450 |
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2451 if (!EnableInvokeDynamic) { |
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2452 warning("JSR 292 invokedynamic is disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableInvokeDynamic to enable."); |
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2453 return; // bind nothing |
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2454 } |
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2455 |
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2456 { |
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2457 ThreadToNativeFromVM ttnfv(thread); |
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2458 |
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2459 int status = env->RegisterNatives(MHN_class, methods2, sizeof(methods2)/sizeof(JNINativeMethod)); |
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2460 if (env->ExceptionOccurred()) { |
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2461 MethodHandles::set_enabled(false); |
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2462 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); |
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2463 env->ExceptionClear(); |
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2464 } else { |
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2465 MethodHandles::set_enabled(true); |
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2466 } |
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2467 } |
710 | 2468 } |
2469 JVM_END |