1 /*
2 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "interpreter/interpreter.hpp"
28 #include "memory/allocation.inline.hpp"
29 #include "memory/oopFactory.hpp"
30 #include "prims/methodHandles.hpp"
31 #include "runtime/javaCalls.hpp"
32 #include "runtime/reflection.hpp"
33 #include "runtime/signature.hpp"
34 #include "runtime/stubRoutines.hpp"
35
36 /*
37 * JSR 292 reference implementation: method handles
38 */
39
40 bool MethodHandles::_enabled = false; // set true after successful native linkage
41
42 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL};
43 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = {
44 "raise_exception",
45 "invokestatic", // how a MH emulates invokestatic
46 "invokespecial", // ditto for the other invokes...
47 "invokevirtual",
48 "invokeinterface",
49 "bound_ref", // these are for BMH...
50 "bound_int",
51 "bound_long",
52 "bound_ref_direct", // (direct versions have a direct methodOop)
53 "bound_int_direct",
54 "bound_long_direct",
55
56 // starting at _adapter_mh_first:
57 "adapter_retype_only", // these are for AMH...
58 "adapter_retype_raw",
59 "adapter_check_cast",
60 "adapter_prim_to_prim",
61 "adapter_ref_to_prim",
62 "adapter_prim_to_ref",
63 "adapter_swap_args",
64 "adapter_rot_args",
65 "adapter_dup_args",
66 "adapter_drop_args",
67 "adapter_collect_args",
68 "adapter_spread_args",
69 "adapter_flyby",
70 "adapter_ricochet",
71
72 // optimized adapter types:
73 "adapter_swap_args/1",
74 "adapter_swap_args/2",
75 "adapter_rot_args/1,up",
76 "adapter_rot_args/1,down",
77 "adapter_rot_args/2,up",
78 "adapter_rot_args/2,down",
79 "adapter_prim_to_prim/i2i",
80 "adapter_prim_to_prim/l2i",
81 "adapter_prim_to_prim/d2f",
82 "adapter_prim_to_prim/i2l",
83 "adapter_prim_to_prim/f2d",
84 "adapter_ref_to_prim/unboxi",
85 "adapter_ref_to_prim/unboxl",
86 "adapter_spread_args/0",
87 "adapter_spread_args/1",
88 "adapter_spread_args/more",
89
90 NULL
91 };
92
93 // Adapters.
94 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
95 int MethodHandles::_adapter_code_size = StubRoutines::method_handles_adapters_code_size;
96
97 jobject MethodHandles::_raise_exception_method;
98
99 #ifdef ASSERT
100 bool MethodHandles::spot_check_entry_names() {
101 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), "");
102 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), "");
103 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), "");
104 assert(!strcmp(entry_name(_adapter_ricochet), "adapter_ricochet"), "");
105 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), "");
106 return true;
107 }
108 #endif
109
110
111 //------------------------------------------------------------------------------
112 // MethodHandles::generate_adapters
113 //
114 void MethodHandles::generate_adapters() {
115 if (!EnableMethodHandles || SystemDictionary::MethodHandle_klass() == NULL) return;
116
117 assert(_adapter_code == NULL, "generate only once");
118
119 ResourceMark rm;
120 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
121 _adapter_code = MethodHandlesAdapterBlob::create(_adapter_code_size);
122 if (_adapter_code == NULL)
123 vm_exit_out_of_memory(_adapter_code_size, "CodeCache: no room for MethodHandles adapters");
124 CodeBuffer code(_adapter_code);
125 MethodHandlesAdapterGenerator g(&code);
126 g.generate();
127 }
128
129
130 //------------------------------------------------------------------------------
131 // MethodHandlesAdapterGenerator::generate
132 //
133 void MethodHandlesAdapterGenerator::generate() {
134 // Generate generic method handle adapters.
135 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST;
136 ek < MethodHandles::_EK_LIMIT;
137 ek = MethodHandles::EntryKind(1 + (int)ek)) {
138 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek));
139 MethodHandles::generate_method_handle_stub(_masm, ek);
140 }
141 }
142
143
144 void MethodHandles::set_enabled(bool z) {
145 if (_enabled != z) {
146 guarantee(z && EnableMethodHandles, "can only enable once, and only if -XX:+EnableMethodHandles");
147 _enabled = z;
148 }
149 }
150
151 // Note: A method which does not have a TRAPS argument cannot block in the GC
152 // or throw exceptions. Such methods are used in this file to do something quick
153 // and local, like parse a data structure. For speed, such methods work on plain
154 // oops, not handles. Trapping methods uniformly operate on handles.
155
156 methodOop MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype,
157 klassOop& receiver_limit_result, int& decode_flags_result) {
158 if (vmtarget == NULL) return NULL;
159 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding");
160 if (vmindex < 0) {
161 // this DMH performs no dispatch; it is directly bound to a methodOop
162 // A MemberName may either be directly bound to a methodOop,
163 // or it may use the klass/index form; both forms mean the same thing.
164 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result);
165 if ((decode_flags_result & _dmf_has_receiver) != 0
166 && java_dyn_MethodType::is_instance(mtype)) {
167 // Extract receiver type restriction from mtype.ptypes[0].
168 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype);
169 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0);
170 if (java_lang_Class::is_instance(ptype0))
171 receiver_limit_result = java_lang_Class::as_klassOop(ptype0);
172 }
173 if (vmindex == methodOopDesc::nonvirtual_vtable_index) {
174 // this DMH can be an "invokespecial" version
175 decode_flags_result &= ~_dmf_does_dispatch;
176 } else {
177 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?");
178 }
179 return m;
180 } else {
181 assert(vmtarget->is_klass(), "must be class or interface");
182 decode_flags_result |= MethodHandles::_dmf_does_dispatch;
183 decode_flags_result |= MethodHandles::_dmf_has_receiver;
184 receiver_limit_result = (klassOop)vmtarget;
185 Klass* tk = Klass::cast((klassOop)vmtarget);
186 if (tk->is_interface()) {
187 // an itable linkage is <interface, itable index>
188 decode_flags_result |= MethodHandles::_dmf_from_interface;
189 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex);
190 } else {
191 if (!tk->oop_is_instance())
192 tk = instanceKlass::cast(SystemDictionary::Object_klass());
193 return ((instanceKlass*)tk)->method_at_vtable(vmindex);
194 }
195 }
196 }
197
198 // MemberName and DirectMethodHandle have the same linkage to the JVM internals.
199 // (MemberName is the non-operational name used for queries and setup.)
200
201 methodOop MethodHandles::decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
202 oop vmtarget = sun_dyn_DirectMethodHandle::vmtarget(mh);
203 int vmindex = sun_dyn_DirectMethodHandle::vmindex(mh);
204 oop mtype = sun_dyn_DirectMethodHandle::type(mh);
205 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result);
206 }
207
208 methodOop MethodHandles::decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
209 assert(sun_dyn_BoundMethodHandle::is_instance(mh), "");
210 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), "");
211 for (oop bmh = mh;;) {
212 // Bound MHs can be stacked to bind several arguments.
213 oop target = java_dyn_MethodHandle::vmtarget(bmh);
214 if (target == NULL) return NULL;
215 decode_flags_result |= MethodHandles::_dmf_binds_argument;
216 klassOop tk = target->klass();
217 if (tk == SystemDictionary::BoundMethodHandle_klass()) {
218 bmh = target;
219 continue;
220 } else {
221 if (java_dyn_MethodHandle::is_subclass(tk)) {
222 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH");
223 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
224 } else {
225 // Optimized case: binding a receiver to a non-dispatched DMH
226 // short-circuits directly to the methodOop.
227 // (It might be another argument besides a receiver also.)
228 assert(target->is_method(), "must be a simple method");
229 decode_flags_result |= MethodHandles::_dmf_binds_method;
230 methodOop m = (methodOop) target;
231 if (!m->is_static())
232 decode_flags_result |= MethodHandles::_dmf_has_receiver;
233 return m;
234 }
235 }
236 }
237 }
238
239 methodOop MethodHandles::decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
240 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), "");
241 for (oop amh = mh;;) {
242 // Adapter MHs can be stacked to convert several arguments.
243 int conv_op = adapter_conversion_op(sun_dyn_AdapterMethodHandle::conversion(amh));
244 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK;
245 oop target = java_dyn_MethodHandle::vmtarget(amh);
246 if (target == NULL) return NULL;
247 klassOop tk = target->klass();
248 if (tk == SystemDictionary::AdapterMethodHandle_klass()) {
249 amh = target;
250 continue;
251 } else {
252 // must be a BMH (which will bind some more arguments) or a DMH (for the final call)
253 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
254 }
255 }
256 }
257
258 methodOop MethodHandles::decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
259 if (mh == NULL) return NULL;
260 klassOop mhk = mh->klass();
261 assert(java_dyn_MethodHandle::is_subclass(mhk), "must be a MethodHandle");
262 if (mhk == SystemDictionary::DirectMethodHandle_klass()) {
263 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result);
264 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) {
265 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
266 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) {
267 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result);
268 } else if (sun_dyn_BoundMethodHandle::is_subclass(mhk)) {
269 // could be a JavaMethodHandle (but not an adapter MH)
270 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
271 } else {
272 assert(false, "cannot parse this MH");
273 return NULL; // random MH?
274 }
275 }
276
277 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) {
278 assert(m->is_method(), "");
279 if (m->is_static()) {
280 // check that signature begins '(L' or '([' (not '(I', '()', etc.)
281 Symbol* sig = m->signature();
282 BasicType recv_bt = char2type(sig->byte_at(1));
283 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')'
284 assert(sig->byte_at(0) == '(', "must be method sig");
285 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY)
286 // decode_flags_result |= _dmf_has_receiver;
287 } else {
288 // non-static method
289 decode_flags_result |= _dmf_has_receiver;
290 if (!m->can_be_statically_bound() && !m->is_initializer()) {
291 decode_flags_result |= _dmf_does_dispatch;
292 if (Klass::cast(m->method_holder())->is_interface())
293 decode_flags_result |= _dmf_from_interface;
294 }
295 }
296 return m;
297 }
298
299
300 // A trusted party is handing us a cookie to determine a method.
301 // Let's boil it down to the method oop they really want.
302 methodOop MethodHandles::decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result) {
303 decode_flags_result = 0;
304 receiver_limit_result = NULL;
305 klassOop xk = x->klass();
306 if (xk == Universe::methodKlassObj()) {
307 return decode_methodOop((methodOop) x, decode_flags_result);
308 } else if (xk == SystemDictionary::MemberName_klass()) {
309 // Note: This only works if the MemberName has already been resolved.
310 return decode_MemberName(x, receiver_limit_result, decode_flags_result);
311 } else if (java_dyn_MethodHandle::is_subclass(xk)) {
312 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result);
313 } else if (xk == SystemDictionary::reflect_Method_klass()) {
314 oop clazz = java_lang_reflect_Method::clazz(x);
315 int slot = java_lang_reflect_Method::slot(x);
316 klassOop k = java_lang_Class::as_klassOop(clazz);
317 if (k != NULL && Klass::cast(k)->oop_is_instance())
318 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
319 decode_flags_result);
320 } else if (xk == SystemDictionary::reflect_Constructor_klass()) {
321 oop clazz = java_lang_reflect_Constructor::clazz(x);
322 int slot = java_lang_reflect_Constructor::slot(x);
323 klassOop k = java_lang_Class::as_klassOop(clazz);
324 if (k != NULL && Klass::cast(k)->oop_is_instance())
325 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
326 decode_flags_result);
327 } else {
328 // unrecognized object
329 assert(!x->is_method(), "already checked");
330 assert(!sun_dyn_MemberName::is_instance(x), "already checked");
331 }
332 return NULL;
333 }
334
335
336 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) {
337 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass())
338 return 0; // no push/pop
339 int this_vmslots = java_dyn_MethodHandle::vmslots(mh);
340 int last_vmslots = 0;
341 oop last_mh = mh;
342 for (;;) {
343 oop target = java_dyn_MethodHandle::vmtarget(last_mh);
344 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
345 last_vmslots = java_dyn_MethodHandle::vmslots(target);
346 break;
347 } else if (!java_dyn_MethodHandle::is_instance(target)) {
348 // might be klass or method
349 assert(target->is_method(), "must get here with a direct ref to method");
350 last_vmslots = methodOop(target)->size_of_parameters();
351 break;
352 }
353 last_mh = target;
354 }
355 // If I am called with fewer VM slots than my ultimate callee,
356 // it must be that I push the additionally needed slots.
357 // Likewise if am called with more VM slots, I will pop them.
358 return (last_vmslots - this_vmslots);
359 }
360
361
362 // MemberName support
363
364 // import sun_dyn_MemberName.*
365 enum {
366 IS_METHOD = sun_dyn_MemberName::MN_IS_METHOD,
367 IS_CONSTRUCTOR = sun_dyn_MemberName::MN_IS_CONSTRUCTOR,
368 IS_FIELD = sun_dyn_MemberName::MN_IS_FIELD,
369 IS_TYPE = sun_dyn_MemberName::MN_IS_TYPE,
370 SEARCH_SUPERCLASSES = sun_dyn_MemberName::MN_SEARCH_SUPERCLASSES,
371 SEARCH_INTERFACES = sun_dyn_MemberName::MN_SEARCH_INTERFACES,
372 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE,
373 VM_INDEX_UNINITIALIZED = sun_dyn_MemberName::VM_INDEX_UNINITIALIZED
374 };
375
376 Handle MethodHandles::new_MemberName(TRAPS) {
377 Handle empty;
378 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
379 if (!k->is_initialized()) k->initialize(CHECK_(empty));
380 return Handle(THREAD, k->allocate_instance(THREAD));
381 }
382
383 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) {
384 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) {
385 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
386 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
387 int mods = java_lang_reflect_Field::modifiers(target_oop);
388 klassOop k = java_lang_Class::as_klassOop(clazz);
389 int offset = instanceKlass::cast(k)->offset_from_fields(slot);
390 init_MemberName(mname_oop, k, accessFlags_from(mods), offset);
391 } else {
392 int decode_flags = 0; klassOop receiver_limit = NULL;
393 methodOop m = MethodHandles::decode_method(target_oop,
394 receiver_limit, decode_flags);
395 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
396 init_MemberName(mname_oop, m, do_dispatch);
397 }
398 }
399
400 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) {
401 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD)
402 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ));
403 oop vmtarget = m;
404 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet
405 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound())
406 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch
407 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value");
408 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget);
409 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex);
410 sun_dyn_MemberName::set_flags(mname_oop, flags);
411 sun_dyn_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror());
412 }
413
414 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) {
415 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ));
416 oop vmtarget = field_holder;
417 int vmindex = offset; // determines the field uniquely when combined with static bit
418 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex");
419 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget);
420 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex);
421 sun_dyn_MemberName::set_flags(mname_oop, flags);
422 sun_dyn_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror());
423 }
424
425
426 methodOop MethodHandles::decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result) {
427 int flags = sun_dyn_MemberName::flags(mname);
428 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return NULL; // not invocable
429 oop vmtarget = sun_dyn_MemberName::vmtarget(mname);
430 int vmindex = sun_dyn_MemberName::vmindex(mname);
431 if (vmindex == VM_INDEX_UNINITIALIZED) return NULL; // not resolved
432 methodOop m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result);
433 oop clazz = sun_dyn_MemberName::clazz(mname);
434 if (clazz != NULL && java_lang_Class::is_instance(clazz)) {
435 klassOop klass = java_lang_Class::as_klassOop(clazz);
436 if (klass != NULL) receiver_limit_result = klass;
437 }
438 return m;
439 }
440
441 // convert the external string or reflective type to an internal signature
442 Symbol* MethodHandles::convert_to_signature(oop type_str,
443 bool polymorphic,
444 TRAPS) {
445 if (java_dyn_MethodType::is_instance(type_str)) {
446 return java_dyn_MethodType::as_signature(type_str, polymorphic, CHECK_NULL);
447 } else if (java_lang_Class::is_instance(type_str)) {
448 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
449 } else if (java_lang_String::is_instance(type_str)) {
450 if (polymorphic) {
451 return java_lang_String::as_symbol(type_str, CHECK_NULL);
452 } else {
453 return java_lang_String::as_symbol_or_null(type_str);
454 }
455 } else {
456 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
457 }
458 }
459
460 // An unresolved member name is a mere symbolic reference.
461 // Resolving it plants a vmtarget/vmindex in it,
462 // which refers dirctly to JVM internals.
463 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
464 assert(sun_dyn_MemberName::is_instance(mname()), "");
465 #ifdef ASSERT
466 // If this assert throws, renegotiate the sentinel value used by the Java code,
467 // so that it is distinct from any valid vtable index value, and any special
468 // values defined in methodOopDesc::VtableIndexFlag.
469 // The point of the slop is to give the Java code and the JVM some room
470 // to independently specify sentinel values.
471 const int sentinel_slop = 10;
472 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop;
473 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels");
474 #endif
475 if (sun_dyn_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED)
476 return; // already resolved
477 oop defc_oop = sun_dyn_MemberName::clazz(mname());
478 oop name_str = sun_dyn_MemberName::name(mname());
479 oop type_str = sun_dyn_MemberName::type(mname());
480 int flags = sun_dyn_MemberName::flags(mname());
481
482 if (defc_oop == NULL || name_str == NULL || type_str == NULL) {
483 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve");
484 }
485 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop);
486 defc_oop = NULL; // safety
487 if (defc_klassOop == NULL) return; // a primitive; no resolution possible
488 if (!Klass::cast(defc_klassOop)->oop_is_instance()) {
489 if (!Klass::cast(defc_klassOop)->oop_is_array()) return;
490 defc_klassOop = SystemDictionary::Object_klass();
491 }
492 instanceKlassHandle defc(THREAD, defc_klassOop);
493 defc_klassOop = NULL; // safety
494 if (defc.is_null()) {
495 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class");
496 }
497 defc->link_class(CHECK);
498
499 // convert the external string name to an internal symbol
500 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str);
501 if (name == NULL) return; // no such name
502 name_str = NULL; // safety
503
504 Handle polymorphic_method_type;
505 bool polymorphic_signature = false;
506 if ((flags & ALL_KINDS) == IS_METHOD &&
507 (defc() == SystemDictionary::MethodHandle_klass() &&
508 methodOopDesc::is_method_handle_invoke_name(name)))
509 polymorphic_signature = true;
510
511 // convert the external string or reflective type to an internal signature
512 TempNewSymbol type = convert_to_signature(type_str, polymorphic_signature, CHECK);
513 if (java_dyn_MethodType::is_instance(type_str) && polymorphic_signature) {
514 polymorphic_method_type = Handle(THREAD, type_str); //preserve exactly
515 }
516
517 if (type == NULL) return; // no such signature exists in the VM
518 type_str = NULL; // safety
519
520 // Time to do the lookup.
521 switch (flags & ALL_KINDS) {
522 case IS_METHOD:
523 {
524 CallInfo result;
525 {
526 EXCEPTION_MARK;
527 if ((flags & JVM_ACC_STATIC) != 0) {
528 LinkResolver::resolve_static_call(result,
529 defc, name, type, KlassHandle(), false, false, THREAD);
530 } else if (defc->is_interface()) {
531 LinkResolver::resolve_interface_call(result, Handle(), defc,
532 defc, name, type, KlassHandle(), false, false, THREAD);
533 } else {
534 LinkResolver::resolve_virtual_call(result, Handle(), defc,
535 defc, name, type, KlassHandle(), false, false, THREAD);
536 }
537 if (HAS_PENDING_EXCEPTION) {
538 CLEAR_PENDING_EXCEPTION;
539 break; // go to second chance
540 }
541 }
542 methodHandle m = result.resolved_method();
543 oop vmtarget = NULL;
544 int vmindex = methodOopDesc::nonvirtual_vtable_index;
545 if (defc->is_interface()) {
546 vmindex = klassItable::compute_itable_index(m());
547 assert(vmindex >= 0, "");
548 } else if (result.has_vtable_index()) {
549 vmindex = result.vtable_index();
550 assert(vmindex >= 0, "");
551 }
552 assert(vmindex != VM_INDEX_UNINITIALIZED, "");
553 if (vmindex < 0) {
554 assert(result.is_statically_bound(), "");
555 vmtarget = m();
556 } else {
557 vmtarget = result.resolved_klass()->as_klassOop();
558 }
559 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
560 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget);
561 sun_dyn_MemberName::set_vmindex(mname(), vmindex);
562 sun_dyn_MemberName::set_modifiers(mname(), mods);
563 DEBUG_ONLY(int junk; klassOop junk2);
564 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(),
565 "properly stored for later decoding");
566 return;
567 }
568 case IS_CONSTRUCTOR:
569 {
570 CallInfo result;
571 {
572 EXCEPTION_MARK;
573 if (name == vmSymbols::object_initializer_name()) {
574 LinkResolver::resolve_special_call(result,
575 defc, name, type, KlassHandle(), false, THREAD);
576 } else {
577 break; // will throw after end of switch
578 }
579 if (HAS_PENDING_EXCEPTION) {
580 CLEAR_PENDING_EXCEPTION;
581 return;
582 }
583 }
584 assert(result.is_statically_bound(), "");
585 methodHandle m = result.resolved_method();
586 oop vmtarget = m();
587 int vmindex = methodOopDesc::nonvirtual_vtable_index;
588 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
589 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget);
590 sun_dyn_MemberName::set_vmindex(mname(), vmindex);
591 sun_dyn_MemberName::set_modifiers(mname(), mods);
592 DEBUG_ONLY(int junk; klassOop junk2);
593 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(),
594 "properly stored for later decoding");
595 return;
596 }
597 case IS_FIELD:
598 {
599 // This is taken from LinkResolver::resolve_field, sans access checks.
600 fieldDescriptor fd; // find_field initializes fd if found
601 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd));
602 // check if field exists; i.e., if a klass containing the field def has been selected
603 if (sel_klass.is_null()) return;
604 oop vmtarget = sel_klass->as_klassOop();
605 int vmindex = fd.offset();
606 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS);
607 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen
608 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget);
609 sun_dyn_MemberName::set_vmindex(mname(), vmindex);
610 sun_dyn_MemberName::set_modifiers(mname(), mods);
611 return;
612 }
613 default:
614 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
615 }
616
617 // Second chance.
618 if (polymorphic_method_type.not_null()) {
619 // Look on a non-null class loader.
620 Handle cur_class_loader;
621 const int nptypes = java_dyn_MethodType::ptype_count(polymorphic_method_type());
622 for (int i = 0; i <= nptypes; i++) {
623 oop type_mirror;
624 if (i < nptypes) type_mirror = java_dyn_MethodType::ptype(polymorphic_method_type(), i);
625 else type_mirror = java_dyn_MethodType::rtype(polymorphic_method_type());
626 klassOop example_type = java_lang_Class::as_klassOop(type_mirror);
627 if (example_type == NULL) continue;
628 oop class_loader = Klass::cast(example_type)->class_loader();
629 if (class_loader == NULL || class_loader == cur_class_loader()) continue;
630 cur_class_loader = Handle(THREAD, class_loader);
631 methodOop m = SystemDictionary::find_method_handle_invoke(name,
632 type,
633 KlassHandle(THREAD, example_type),
634 THREAD);
635 if (HAS_PENDING_EXCEPTION) {
636 CLEAR_PENDING_EXCEPTION;
637 m = NULL;
638 // try again with a different class loader...
639 }
640 if (m != NULL) {
641 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
642 sun_dyn_MemberName::set_vmtarget(mname(), m);
643 sun_dyn_MemberName::set_vmindex(mname(), m->vtable_index());
644 sun_dyn_MemberName::set_modifiers(mname(), mods);
645 return;
646 }
647 }
648 }
649 }
650
651 // Conversely, a member name which is only initialized from JVM internals
652 // may have null defc, name, and type fields.
653 // Resolving it plants a vmtarget/vmindex in it,
654 // which refers directly to JVM internals.
655 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
656 assert(sun_dyn_MemberName::is_instance(mname()), "");
657 oop vmtarget = sun_dyn_MemberName::vmtarget(mname());
658 int vmindex = sun_dyn_MemberName::vmindex(mname());
659 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) {
660 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
661 }
662
663 bool have_defc = (sun_dyn_MemberName::clazz(mname()) != NULL);
664 bool have_name = (sun_dyn_MemberName::name(mname()) != NULL);
665 bool have_type = (sun_dyn_MemberName::type(mname()) != NULL);
666 int flags = sun_dyn_MemberName::flags(mname());
667
668 if (suppress != 0) {
669 if (suppress & _suppress_defc) have_defc = true;
670 if (suppress & _suppress_name) have_name = true;
671 if (suppress & _suppress_type) have_type = true;
672 }
673
674 if (have_defc && have_name && have_type) return; // nothing needed
675
676 switch (flags & ALL_KINDS) {
677 case IS_METHOD:
678 case IS_CONSTRUCTOR:
679 {
680 klassOop receiver_limit = NULL;
681 int decode_flags = 0;
682 methodHandle m(THREAD, decode_vmtarget(vmtarget, vmindex, NULL,
683 receiver_limit, decode_flags));
684 if (m.is_null()) break;
685 if (!have_defc) {
686 klassOop defc = m->method_holder();
687 if (receiver_limit != NULL && receiver_limit != defc
688 && Klass::cast(receiver_limit)->is_subtype_of(defc))
689 defc = receiver_limit;
690 sun_dyn_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror());
691 }
692 if (!have_name) {
693 //not java_lang_String::create_from_symbol; let's intern member names
694 Handle name = StringTable::intern(m->name(), CHECK);
695 sun_dyn_MemberName::set_name(mname(), name());
696 }
697 if (!have_type) {
698 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
699 sun_dyn_MemberName::set_type(mname(), type());
700 }
701 return;
702 }
703 case IS_FIELD:
704 {
705 // This is taken from LinkResolver::resolve_field, sans access checks.
706 if (!vmtarget->is_klass()) break;
707 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break;
708 instanceKlassHandle defc(THREAD, (klassOop) vmtarget);
709 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
710 fieldDescriptor fd; // find_field initializes fd if found
711 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
712 break; // cannot expand
713 if (!have_defc) {
714 sun_dyn_MemberName::set_clazz(mname(), defc->java_mirror());
715 }
716 if (!have_name) {
717 //not java_lang_String::create_from_symbol; let's intern member names
718 Handle name = StringTable::intern(fd.name(), CHECK);
719 sun_dyn_MemberName::set_name(mname(), name());
720 }
721 if (!have_type) {
722 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
723 sun_dyn_MemberName::set_type(mname(), type());
724 }
725 return;
726 }
727 }
728 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
729 }
730
731 int MethodHandles::find_MemberNames(klassOop k,
732 Symbol* name, Symbol* sig,
733 int mflags, klassOop caller,
734 int skip, objArrayOop results) {
735 DEBUG_ONLY(No_Safepoint_Verifier nsv);
736 // this code contains no safepoints!
737
738 // %%% take caller into account!
739
740 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1;
741
742 int rfill = 0, rlimit = results->length(), rskip = skip;
743 // overflow measurement:
744 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
745
746 int match_flags = mflags;
747 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
748 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
749 bool local_only = !(search_superc | search_intfc);
750 bool classes_only = false;
751
752 if (name != NULL) {
753 if (name->utf8_length() == 0) return 0; // a match is not possible
754 }
755 if (sig != NULL) {
756 if (sig->utf8_length() == 0) return 0; // a match is not possible
757 if (sig->byte_at(0) == '(')
758 match_flags &= ~(IS_FIELD | IS_TYPE);
759 else
760 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
761 }
762
763 if ((match_flags & IS_TYPE) != 0) {
764 // NYI, and Core Reflection works quite well for this query
765 }
766
767 if ((match_flags & IS_FIELD) != 0) {
768 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
769 if (name != NULL && st.name() != name)
770 continue;
771 if (sig != NULL && st.signature() != sig)
772 continue;
773 // passed the filters
774 if (rskip > 0) {
775 --rskip;
776 } else if (rfill < rlimit) {
777 oop result = results->obj_at(rfill++);
778 if (!sun_dyn_MemberName::is_instance(result))
779 return -99; // caller bug!
780 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset());
781 } else if (++overflow >= overflow_limit) {
782 match_flags = 0; break; // got tired of looking at overflow
783 }
784 }
785 }
786
787 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
788 // watch out for these guys:
789 Symbol* init_name = vmSymbols::object_initializer_name();
790 Symbol* clinit_name = vmSymbols::class_initializer_name();
791 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
792 bool negate_name_test = false;
793 // fix name so that it captures the intention of IS_CONSTRUCTOR
794 if (!(match_flags & IS_METHOD)) {
795 // constructors only
796 if (name == NULL) {
797 name = init_name;
798 } else if (name != init_name) {
799 return 0; // no constructors of this method name
800 }
801 } else if (!(match_flags & IS_CONSTRUCTOR)) {
802 // methods only
803 if (name == NULL) {
804 name = init_name;
805 negate_name_test = true; // if we see the name, we *omit* the entry
806 } else if (name == init_name) {
807 return 0; // no methods of this constructor name
808 }
809 } else {
810 // caller will accept either sort; no need to adjust name
811 }
812 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
813 methodOop m = st.method();
814 Symbol* m_name = m->name();
815 if (m_name == clinit_name)
816 continue;
817 if (name != NULL && ((m_name != name) ^ negate_name_test))
818 continue;
819 if (sig != NULL && m->signature() != sig)
820 continue;
821 // passed the filters
822 if (rskip > 0) {
823 --rskip;
824 } else if (rfill < rlimit) {
825 oop result = results->obj_at(rfill++);
826 if (!sun_dyn_MemberName::is_instance(result))
827 return -99; // caller bug!
828 MethodHandles::init_MemberName(result, m, true);
829 } else if (++overflow >= overflow_limit) {
830 match_flags = 0; break; // got tired of looking at overflow
831 }
832 }
833 }
834
835 // return number of elements we at leasted wanted to initialize
836 return rfill + overflow;
837 }
838
839
840 // Decode this java.lang.Class object into an instanceKlass, if possible.
841 // Throw IAE if not
842 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) {
843 instanceKlassHandle empty;
844 klassOop caller = NULL;
845 if (java_lang_Class::is_instance(java_mirror_oop)) {
846 caller = java_lang_Class::as_klassOop(java_mirror_oop);
847 }
848 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) {
849 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty);
850 }
851 return instanceKlassHandle(THREAD, caller);
852 }
853
854
855
856 // Decode the vmtarget field of a method handle.
857 // Sanitize out methodOops, klassOops, and any other non-Java data.
858 // This is for debugging and reflection.
859 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) {
860 assert(java_dyn_MethodHandle::is_instance(mh()), "must be a MH");
861 if (format == ETF_HANDLE_OR_METHOD_NAME) {
862 oop target = java_dyn_MethodHandle::vmtarget(mh());
863 if (target == NULL) {
864 return NULL; // unformed MH
865 }
866 klassOop tklass = target->klass();
867 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) {
868 return target; // target is another MH (or something else?)
869 }
870 }
871 if (format == ETF_DIRECT_HANDLE) {
872 oop target = mh();
873 for (;;) {
874 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
875 return target;
876 }
877 if (!java_dyn_MethodHandle::is_instance(target)){
878 return NULL; // unformed MH
879 }
880 target = java_dyn_MethodHandle::vmtarget(target);
881 }
882 }
883 // cases of metadata in MH.vmtarget:
884 // - AMH can have methodOop for static invoke with bound receiver
885 // - DMH can have methodOop for static invoke (on variable receiver)
886 // - DMH can have klassOop for dispatched (non-static) invoke
887 klassOop receiver_limit = NULL;
888 int decode_flags = 0;
889 methodOop m = decode_MethodHandle(mh(), receiver_limit, decode_flags);
890 if (m == NULL) return NULL;
891 switch (format) {
892 case ETF_REFLECT_METHOD:
893 // same as jni_ToReflectedMethod:
894 if (m->is_initializer()) {
895 return Reflection::new_constructor(m, THREAD);
896 } else {
897 return Reflection::new_method(m, UseNewReflection, false, THREAD);
898 }
899
900 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle
901 case ETF_METHOD_NAME:
902 {
903 if (SystemDictionary::MemberName_klass() == NULL) break;
904 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass());
905 mname_klass->initialize(CHECK_NULL);
906 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL);
907 sun_dyn_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED);
908 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
909 init_MemberName(mname(), m, do_dispatch);
910 expand_MemberName(mname, 0, CHECK_NULL);
911 return mname();
912 }
913 }
914
915 // Unknown format code.
916 char msg[50];
917 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format);
918 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg);
919 }
920
921 static const char* always_null_names[] = {
922 "java/lang/Void",
923 "java/lang/Null",
924 //"java/lang/Nothing",
925 "sun/dyn/empty/Empty",
926 NULL
927 };
928
929 static bool is_always_null_type(klassOop klass) {
930 if (!Klass::cast(klass)->oop_is_instance()) return false;
931 instanceKlass* ik = instanceKlass::cast(klass);
932 // Must be on the boot class path:
933 if (ik->class_loader() != NULL) return false;
934 // Check the name.
935 Symbol* name = ik->name();
936 for (int i = 0; ; i++) {
937 const char* test_name = always_null_names[i];
938 if (test_name == NULL) break;
939 if (name->equals(test_name))
940 return true;
941 }
942 return false;
943 }
944
945 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) {
946 if (src == dst || dst == SystemDictionary::Object_klass())
947 return false; // quickest checks
948 Klass* srck = Klass::cast(src);
949 Klass* dstk = Klass::cast(dst);
950 if (dstk->is_interface()) {
951 // interface receivers can safely be viewed as untyped,
952 // because interface calls always include a dynamic check
953 //dstk = Klass::cast(SystemDictionary::Object_klass());
954 return false;
955 }
956 if (srck->is_interface()) {
957 // interface arguments must be viewed as untyped
958 //srck = Klass::cast(SystemDictionary::Object_klass());
959 return true;
960 }
961 if (is_always_null_type(src)) {
962 // some source types are known to be never instantiated;
963 // they represent references which are always null
964 // such null references never fail to convert safely
965 return false;
966 }
967 return !srck->is_subclass_of(dstk->as_klassOop());
968 }
969
970 static oop object_java_mirror() {
971 return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
972 }
973
974 bool MethodHandles::same_basic_type_for_arguments(BasicType src,
975 BasicType dst,
976 bool raw,
977 bool for_return) {
978 if (for_return) {
979 // return values can always be forgotten:
980 if (dst == T_VOID) return true;
981 if (src == T_VOID) return raw && (dst == T_INT);
982 // We allow caller to receive a garbage int, which is harmless.
983 // This trick is pulled by trusted code (see VerifyType.canPassRaw).
984 }
985 assert(src != T_VOID && dst != T_VOID, "should not be here");
986 if (src == dst) return true;
987 if (type2size[src] != type2size[dst]) return false;
988 if (src == T_OBJECT || dst == T_OBJECT) return false;
989 if (raw) return true; // bitwise reinterpretation; caller guarantees safety
990 // allow reinterpretation casts for integral widening
991 if (is_subword_type(src)) { // subwords can fit in int or other subwords
992 if (dst == T_INT) // any subword fits in an int
993 return true;
994 if (src == T_BOOLEAN) // boolean fits in any subword
995 return is_subword_type(dst);
996 if (src == T_BYTE && dst == T_SHORT)
997 return true; // remaining case: byte fits in short
998 }
999 // allow float/fixed reinterpretation casts
1000 if (src == T_FLOAT) return dst == T_INT;
1001 if (src == T_INT) return dst == T_FLOAT;
1002 if (src == T_DOUBLE) return dst == T_LONG;
1003 if (src == T_LONG) return dst == T_DOUBLE;
1004 return false;
1005 }
1006
1007 const char* MethodHandles::check_method_receiver(methodOop m,
1008 klassOop passed_recv_type) {
1009 assert(!m->is_static(), "caller resp.");
1010 if (passed_recv_type == NULL)
1011 return "receiver type is primitive";
1012 if (class_cast_needed(passed_recv_type, m->method_holder())) {
1013 Klass* formal = Klass::cast(m->method_holder());
1014 return SharedRuntime::generate_class_cast_message("receiver type",
1015 formal->external_name());
1016 }
1017 return NULL; // checks passed
1018 }
1019
1020 // Verify that m's signature can be called type-safely by a method handle
1021 // of the given method type 'mtype'.
1022 // It takes a TRAPS argument because it must perform symbol lookups.
1023 void MethodHandles::verify_method_signature(methodHandle m,
1024 Handle mtype,
1025 int first_ptype_pos,
1026 KlassHandle insert_ptype,
1027 TRAPS) {
1028 objArrayHandle ptypes(THREAD, java_dyn_MethodType::ptypes(mtype()));
1029 int pnum = first_ptype_pos;
1030 int pmax = ptypes->length();
1031 int mnum = 0; // method argument
1032 const char* err = NULL;
1033 ResourceMark rm(THREAD);
1034 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
1035 oop ptype_oop = NULL;
1036 if (ss.at_return_type()) {
1037 if (pnum != pmax)
1038 { err = "too many arguments"; break; }
1039 ptype_oop = java_dyn_MethodType::rtype(mtype());
1040 } else {
1041 if (pnum >= pmax)
1042 { err = "not enough arguments"; break; }
1043 if (pnum >= 0)
1044 ptype_oop = ptypes->obj_at(pnum);
1045 else if (insert_ptype.is_null())
1046 ptype_oop = NULL;
1047 else
1048 ptype_oop = insert_ptype->java_mirror();
1049 pnum += 1;
1050 mnum += 1;
1051 }
1052 klassOop pklass = NULL;
1053 BasicType ptype = T_OBJECT;
1054 if (ptype_oop != NULL)
1055 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass);
1056 else
1057 // null does not match any non-reference; use Object to report the error
1058 pklass = SystemDictionary::Object_klass();
1059 klassOop mklass = NULL;
1060 BasicType mtype = ss.type();
1061 if (mtype == T_ARRAY) mtype = T_OBJECT; // fold all refs to T_OBJECT
1062 if (mtype == T_OBJECT) {
1063 if (ptype_oop == NULL) {
1064 // null matches any reference
1065 continue;
1066 }
1067 KlassHandle pklass_handle(THREAD, pklass); pklass = NULL;
1068 // If we fail to resolve types at this point, we will throw an error.
1069 Symbol* name = ss.as_symbol(CHECK);
1070 instanceKlass* mk = instanceKlass::cast(m->method_holder());
1071 Handle loader(THREAD, mk->class_loader());
1072 Handle domain(THREAD, mk->protection_domain());
1073 mklass = SystemDictionary::resolve_or_null(name, loader, domain, CHECK);
1074 pklass = pklass_handle();
1075 if (mklass == NULL && pklass != NULL &&
1076 Klass::cast(pklass)->name() == name &&
1077 m->is_method_handle_invoke()) {
1078 // Assume a match. We can't really decode the signature of MH.invoke*.
1079 continue;
1080 }
1081 }
1082 if (!ss.at_return_type()) {
1083 err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum);
1084 } else {
1085 err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal!
1086 }
1087 if (err != NULL) break;
1088 }
1089
1090 if (err != NULL) {
1091 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1092 }
1093 }
1094
1095 // Main routine for verifying the MethodHandle.type of a proposed
1096 // direct or bound-direct method handle.
1097 void MethodHandles::verify_method_type(methodHandle m,
1098 Handle mtype,
1099 bool has_bound_recv,
1100 KlassHandle bound_recv_type,
1101 TRAPS) {
1102 bool m_needs_receiver = !m->is_static();
1103
1104 const char* err = NULL;
1105
1106 int first_ptype_pos = m_needs_receiver ? 1 : 0;
1107 if (has_bound_recv) {
1108 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them
1109 if (m_needs_receiver && bound_recv_type.is_null())
1110 { err = "bound receiver is not an object"; goto die; }
1111 }
1112
1113 if (m_needs_receiver && err == NULL) {
1114 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype());
1115 if (ptypes->length() < first_ptype_pos)
1116 { err = "receiver argument is missing"; goto die; }
1117 if (has_bound_recv)
1118 err = check_method_receiver(m(), bound_recv_type->as_klassOop());
1119 else
1120 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1)));
1121 if (err != NULL) goto die;
1122 }
1123
1124 // Check the other arguments for mistypes.
1125 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK);
1126 return;
1127
1128 die:
1129 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1130 }
1131
1132 void MethodHandles::verify_vmslots(Handle mh, TRAPS) {
1133 // Verify vmslots.
1134 int check_slots = argument_slot_count(java_dyn_MethodHandle::type(mh()));
1135 if (java_dyn_MethodHandle::vmslots(mh()) != check_slots) {
1136 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH");
1137 }
1138 }
1139
1140 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) {
1141 // Verify that argslot points at the given argnum.
1142 int check_slot = argument_slot(java_dyn_MethodHandle::type(mh()), argnum);
1143 if (argslot != check_slot || argslot < 0) {
1144 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d";
1145 size_t msglen = strlen(fmt) + 3*11 + 1;
1146 char* msg = NEW_RESOURCE_ARRAY(char, msglen);
1147 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot);
1148 THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
1149 }
1150 }
1151
1152 // Verify the correspondence between two method types.
1153 // Apart from the advertised changes, caller method type X must
1154 // be able to invoke the callee method Y type with no violations
1155 // of type integrity.
1156 // Return NULL if all is well, else a short error message.
1157 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end,
1158 int insert_argnum, oop insert_type,
1159 int change_argnum, oop change_type,
1160 int delete_argnum,
1161 oop dst_mtype, int dst_beg, int dst_end,
1162 bool raw) {
1163 objArrayOop src_ptypes = java_dyn_MethodType::ptypes(src_mtype);
1164 objArrayOop dst_ptypes = java_dyn_MethodType::ptypes(dst_mtype);
1165
1166 int src_max = src_ptypes->length();
1167 int dst_max = dst_ptypes->length();
1168
1169 if (src_end == -1) src_end = src_max;
1170 if (dst_end == -1) dst_end = dst_max;
1171
1172 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob");
1173 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob");
1174
1175 // pending actions; set to -1 when done:
1176 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum;
1177
1178 const char* err = NULL;
1179
1180 // Walk along each array of parameter types, including a virtual
1181 // NULL end marker at the end of each.
1182 for (int src_idx = src_beg, dst_idx = dst_beg;
1183 (src_idx <= src_end && dst_idx <= dst_end);
1184 src_idx++, dst_idx++) {
1185 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx);
1186 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx);
1187 bool fix_null_src_type = false;
1188
1189 // Perform requested edits.
1190 if (ins_idx == src_idx) {
1191 // note that the inserted guy is never affected by a change or deletion
1192 ins_idx = -1;
1193 src_type = insert_type;
1194 fix_null_src_type = true;
1195 --src_idx; // back up to process src type on next loop
1196 src_idx = src_end;
1197 } else {
1198 // note that the changed guy can be immediately deleted
1199 if (chg_idx == src_idx) {
1200 chg_idx = -1;
1201 assert(src_idx < src_end, "oob");
1202 src_type = change_type;
1203 fix_null_src_type = true;
1204 }
1205 if (del_idx == src_idx) {
1206 del_idx = -1;
1207 assert(src_idx < src_end, "oob");
1208 --dst_idx;
1209 continue; // rerun loop after skipping this position
1210 }
1211 }
1212
1213 if (src_type == NULL && fix_null_src_type)
1214 // explicit null in this case matches any dest reference
1215 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type);
1216
1217 // Compare the two argument types.
1218 if (src_type != dst_type) {
1219 if (src_type == NULL) return "not enough arguments";
1220 if (dst_type == NULL) return "too many arguments";
1221 err = check_argument_type_change(src_type, dst_type, dst_idx, raw);
1222 if (err != NULL) return err;
1223 }
1224 }
1225
1226 // Now compare return types also.
1227 oop src_rtype = java_dyn_MethodType::rtype(src_mtype);
1228 oop dst_rtype = java_dyn_MethodType::rtype(dst_mtype);
1229 if (src_rtype != dst_rtype) {
1230 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal!
1231 if (err != NULL) return err;
1232 }
1233
1234 assert(err == NULL, "");
1235 return NULL; // all is well
1236 }
1237
1238
1239 const char* MethodHandles::check_argument_type_change(BasicType src_type,
1240 klassOop src_klass,
1241 BasicType dst_type,
1242 klassOop dst_klass,
1243 int argnum,
1244 bool raw) {
1245 const char* err = NULL;
1246 bool for_return = (argnum < 0);
1247
1248 // just in case:
1249 if (src_type == T_ARRAY) src_type = T_OBJECT;
1250 if (dst_type == T_ARRAY) dst_type = T_OBJECT;
1251
1252 // Produce some nice messages if VerifyMethodHandles is turned on:
1253 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) {
1254 if (src_type == T_OBJECT) {
1255 if (raw && dst_type == T_INT && is_always_null_type(src_klass))
1256 return NULL; // OK to convert a null pointer to a garbage int
1257 err = ((argnum >= 0)
1258 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s"
1259 : "type mismatch: returning a %s, but caller expects primitive %s");
1260 } else if (dst_type == T_OBJECT) {
1261 err = ((argnum >= 0)
1262 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s"
1263 : "type mismatch: returning a primitive %s, but caller expects %s");
1264 } else {
1265 err = ((argnum >= 0)
1266 ? "type mismatch: passing a %s for method argument #%d, which expects %s"
1267 : "type mismatch: returning a %s, but caller expects %s");
1268 }
1269 } else if (src_type == T_OBJECT && dst_type == T_OBJECT &&
1270 class_cast_needed(src_klass, dst_klass)) {
1271 if (!class_cast_needed(dst_klass, src_klass)) {
1272 if (raw)
1273 return NULL; // reverse cast is OK; the MH target is trusted to enforce it
1274 err = ((argnum >= 0)
1275 ? "cast required: passing a %s for method argument #%d, which expects %s"
1276 : "cast required: returning a %s, but caller expects %s");
1277 } else {
1278 err = ((argnum >= 0)
1279 ? "reference mismatch: passing a %s for method argument #%d, which expects %s"
1280 : "reference mismatch: returning a %s, but caller expects %s");
1281 }
1282 } else {
1283 // passed the obstacle course
1284 return NULL;
1285 }
1286
1287 // format, format, format
1288 const char* src_name = type2name(src_type);
1289 const char* dst_name = type2name(dst_type);
1290 if (src_type == T_OBJECT) src_name = Klass::cast(src_klass)->external_name();
1291 if (dst_type == T_OBJECT) dst_name = Klass::cast(dst_klass)->external_name();
1292 if (src_name == NULL) src_name = "unknown type";
1293 if (dst_name == NULL) dst_name = "unknown type";
1294
1295 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11);
1296 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1);
1297 if (argnum >= 0) {
1298 assert(strstr(err, "%d") != NULL, "");
1299 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name);
1300 } else {
1301 assert(strstr(err, "%d") == NULL, "");
1302 jio_snprintf(msg, msglen, err, src_name, dst_name);
1303 }
1304 return msg;
1305 }
1306
1307 // Compute the depth within the stack of the given argument, i.e.,
1308 // the combined size of arguments to the right of the given argument.
1309 // For the last argument (ptypes.length-1) this will be zero.
1310 // For the first argument (0) this will be the size of all
1311 // arguments but that one. For the special number -1, this
1312 // will be the size of all arguments, including the first.
1313 // If the argument is neither -1 nor a valid argument index,
1314 // then return a negative number. Otherwise, the result
1315 // is in the range [0..vmslots] inclusive.
1316 int MethodHandles::argument_slot(oop method_type, int arg) {
1317 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type);
1318 int argslot = 0;
1319 int len = ptypes->length();
1320 if (arg < -1 || arg >= len) return -99;
1321 for (int i = len-1; i > arg; i--) {
1322 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1323 argslot += type2size[bt];
1324 }
1325 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works");
1326 return argslot;
1327 }
1328
1329 // Given a slot number, return the argument number.
1330 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) {
1331 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type);
1332 int argslot = 0;
1333 int len = ptypes->length();
1334 for (int i = len-1; i >= 0; i--) {
1335 if (query_argslot == argslot) return i;
1336 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1337 argslot += type2size[bt];
1338 }
1339 // return pseudo-arg deepest in stack:
1340 if (query_argslot == argslot) return -1;
1341 return -99; // oob slot, or splitting a double-slot arg
1342 }
1343
1344 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m,
1345 KlassHandle receiver_limit,
1346 int decode_flags,
1347 KlassHandle receiver_klass,
1348 TRAPS) {
1349 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference");
1350 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument");
1351
1352 if (!m->is_static() &&
1353 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder())))
1354 // given type does not match class of method, or receiver is null!
1355 // caller should have checked this, but let's be extra careful...
1356 return methodHandle();
1357
1358 if (receiver_limit.not_null() &&
1359 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit())))
1360 // given type is not limited to the receiver type
1361 // note that a null receiver can match any reference value, for a static method
1362 return methodHandle();
1363
1364 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) {
1365 // pre-dispatched or static method (null receiver is OK for static)
1366 return m;
1367
1368 } else if (receiver_klass.is_null()) {
1369 // null receiver value; cannot dispatch
1370 return methodHandle();
1371
1372 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) {
1373 // perform virtual dispatch
1374 int vtable_index = m->vtable_index();
1375 guarantee(vtable_index >= 0, "valid vtable index");
1376
1377 // receiver_klass might be an arrayKlassOop but all vtables start at
1378 // the same place. The cast is to avoid virtual call and assertion.
1379 // See also LinkResolver::runtime_resolve_virtual_method.
1380 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass());
1381 DEBUG_ONLY(inst->verify_vtable_index(vtable_index));
1382 methodOop m_oop = inst->method_at_vtable(vtable_index);
1383 return methodHandle(THREAD, m_oop);
1384
1385 } else {
1386 // perform interface dispatch
1387 int itable_index = klassItable::compute_itable_index(m());
1388 guarantee(itable_index >= 0, "valid itable index");
1389 instanceKlass* inst = instanceKlass::cast(receiver_klass());
1390 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD);
1391 return methodHandle(THREAD, m_oop);
1392 }
1393 }
1394
1395 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) {
1396 // Verify type.
1397 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh()));
1398 verify_method_type(m, mtype, false, KlassHandle(), CHECK);
1399
1400 // Verify vmslots.
1401 if (java_dyn_MethodHandle::vmslots(mh()) != m->size_of_parameters()) {
1402 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH");
1403 }
1404 }
1405
1406 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) {
1407 // Check arguments.
1408 if (mh.is_null() || m.is_null() ||
1409 (!do_dispatch && m->is_abstract())) {
1410 THROW(vmSymbols::java_lang_InternalError());
1411 }
1412
1413 java_dyn_MethodHandle::init_vmslots(mh());
1414
1415 if (VerifyMethodHandles) {
1416 // The privileged code which invokes this routine should not make
1417 // a mistake about types, but it's better to verify.
1418 verify_DirectMethodHandle(mh, m, CHECK);
1419 }
1420
1421 // Finally, after safety checks are done, link to the target method.
1422 // We will follow the same path as the latter part of
1423 // InterpreterRuntime::resolve_invoke(), which first finds the method
1424 // and then decides how to populate the constant pool cache entry
1425 // that links the interpreter calls to the method. We need the same
1426 // bits, and will use the same calling sequence code.
1427
1428 int vmindex = methodOopDesc::garbage_vtable_index;
1429 oop vmtarget = NULL;
1430
1431 instanceKlass::cast(m->method_holder())->link_class(CHECK);
1432
1433 MethodHandleEntry* me = NULL;
1434 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) {
1435 // We are simulating an invokeinterface instruction.
1436 // (We might also be simulating an invokevirtual on a miranda method,
1437 // but it is safe to treat it as an invokeinterface.)
1438 assert(!m->can_be_statically_bound(), "no final methods on interfaces");
1439 vmindex = klassItable::compute_itable_index(m());
1440 assert(vmindex >= 0, "(>=0) == do_dispatch");
1441 // Set up same bits as ConstantPoolCacheEntry::set_interface_call().
1442 vmtarget = m->method_holder(); // the interface
1443 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh);
1444 } else if (!do_dispatch || m->can_be_statically_bound()) {
1445 // We are simulating an invokestatic or invokespecial instruction.
1446 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method().
1447 vmtarget = m();
1448 // this does not help dispatch, but it will make it possible to parse this MH:
1449 vmindex = methodOopDesc::nonvirtual_vtable_index;
1450 assert(vmindex < 0, "(>=0) == do_dispatch");
1451 if (!m->is_static()) {
1452 me = MethodHandles::entry(MethodHandles::_invokespecial_mh);
1453 } else {
1454 me = MethodHandles::entry(MethodHandles::_invokestatic_mh);
1455 // Part of the semantics of a static call is an initialization barrier.
1456 // For a DMH, it is done now, when the handle is created.
1457 Klass* k = Klass::cast(m->method_holder());
1458 if (k->should_be_initialized()) {
1459 k->initialize(CHECK);
1460 }
1461 }
1462 } else {
1463 // We are simulating an invokevirtual instruction.
1464 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method().
1465 // The key logic is LinkResolver::runtime_resolve_virtual_method.
1466 vmindex = m->vtable_index();
1467 vmtarget = m->method_holder();
1468 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh);
1469 }
1470
1471 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
1472
1473 sun_dyn_DirectMethodHandle::set_vmtarget(mh(), vmtarget);
1474 sun_dyn_DirectMethodHandle::set_vmindex(mh(), vmindex);
1475 DEBUG_ONLY(int flags; klassOop rlimit);
1476 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(),
1477 "properly stored for later decoding");
1478 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0));
1479 assert(!(actual_do_dispatch && !do_dispatch),
1480 "do not perform dispatch if !do_dispatch specified");
1481 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch");
1482 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack");
1483
1484 // Done!
1485 java_dyn_MethodHandle::set_vmentry(mh(), me);
1486 }
1487
1488 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh,
1489 methodHandle m,
1490 TRAPS) {
1491 // Verify type.
1492 oop receiver = sun_dyn_BoundMethodHandle::argument(mh());
1493 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh()));
1494 KlassHandle bound_recv_type;
1495 if (receiver != NULL) bound_recv_type = KlassHandle(THREAD, receiver->klass());
1496 verify_method_type(m, mtype, true, bound_recv_type, CHECK);
1497
1498 int receiver_pos = m->size_of_parameters() - 1;
1499
1500 // Verify MH.vmargslot, which should point at the bound receiver.
1501 verify_vmargslot(mh, -1, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK);
1502 //verify_vmslots(mh, CHECK);
1503
1504 // Verify vmslots.
1505 if (java_dyn_MethodHandle::vmslots(mh()) != receiver_pos) {
1506 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)");
1507 }
1508 }
1509
1510 // Initialize a BMH with a receiver bound directly to a methodOop.
1511 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh,
1512 methodHandle original_m,
1513 KlassHandle receiver_limit,
1514 int decode_flags,
1515 TRAPS) {
1516 // Check arguments.
1517 if (mh.is_null() || original_m.is_null()) {
1518 THROW(vmSymbols::java_lang_InternalError());
1519 }
1520
1521 KlassHandle receiver_klass;
1522 {
1523 oop receiver_oop = sun_dyn_BoundMethodHandle::argument(mh());
1524 if (receiver_oop != NULL)
1525 receiver_klass = KlassHandle(THREAD, receiver_oop->klass());
1526 }
1527 methodHandle m = dispatch_decoded_method(original_m,
1528 receiver_limit, decode_flags,
1529 receiver_klass,
1530 CHECK);
1531 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); }
1532 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); }
1533
1534 java_dyn_MethodHandle::init_vmslots(mh());
1535
1536 if (VerifyMethodHandles) {
1537 verify_BoundMethodHandle_with_receiver(mh, m, CHECK);
1538 }
1539
1540 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m());
1541
1542 DEBUG_ONLY(int junk; klassOop junk2);
1543 assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding");
1544 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot");
1545
1546 // Done!
1547 java_dyn_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh));
1548 }
1549
1550 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
1551 bool direct_to_method, TRAPS) {
1552 Handle ptype_handle(THREAD,
1553 java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum));
1554 KlassHandle ptype_klass;
1555 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass);
1556 int slots_pushed = type2size[ptype];
1557
1558 oop argument = sun_dyn_BoundMethodHandle::argument(mh());
1559
1560 const char* err = NULL;
1561
1562 switch (ptype) {
1563 case T_OBJECT:
1564 if (argument != NULL)
1565 // we must implicitly convert from the arg type to the outgoing ptype
1566 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum);
1567 break;
1568
1569 case T_ARRAY: case T_VOID:
1570 assert(false, "array, void do not appear here");
1571 default:
1572 if (ptype != T_INT && !is_subword_type(ptype)) {
1573 err = "unexpected parameter type";
1574 break;
1575 }
1576 // check subrange of Integer.value, if necessary
1577 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) {
1578 err = "bound integer argument must be of type java.lang.Integer";
1579 break;
1580 }
1581 if (ptype != T_INT) {
1582 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
1583 jint value = argument->int_field(value_offset);
1584 int vminfo = adapter_unbox_subword_vminfo(ptype);
1585 jint subword = truncate_subword_from_vminfo(value, vminfo);
1586 if (value != subword) {
1587 err = "bound subword value does not fit into the subword type";
1588 break;
1589 }
1590 }
1591 break;
1592 case T_FLOAT:
1593 case T_DOUBLE:
1594 case T_LONG:
1595 {
1596 // we must implicitly convert from the unboxed arg type to the outgoing ptype
1597 BasicType argbox = java_lang_boxing_object::basic_type(argument);
1598 if (argbox != ptype) {
1599 err = check_argument_type_change(T_OBJECT, (argument == NULL
1600 ? SystemDictionary::Object_klass()
1601 : argument->klass()),
1602 ptype, ptype_klass(), argnum);
1603 assert(err != NULL, "this must be an error");
1604 }
1605 break;
1606 }
1607 }
1608
1609 if (err == NULL) {
1610 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1611 if (direct_to_method) {
1612 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots");
1613 assert(slots_pushed <= MethodHandlePushLimit, "");
1614 } else {
1615 int target_pushes = decode_MethodHandle_stack_pushes(target());
1616 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct");
1617 // do not blow the stack; use a Java-based adapter if this limit is exceeded
1618 // FIXME
1619 // if (slots_pushed + target_pushes > MethodHandlePushLimit)
1620 // err = "too many bound parameters";
1621 }
1622 }
1623
1624 if (err == NULL) {
1625 // Verify the rest of the method type.
1626 err = check_method_type_insertion(java_dyn_MethodHandle::type(mh()),
1627 argnum, ptype_handle(),
1628 java_dyn_MethodHandle::type(target()));
1629 }
1630
1631 if (err != NULL) {
1632 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1633 }
1634 }
1635
1636 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
1637 // Check arguments.
1638 if (mh.is_null() || target.is_null() || !java_dyn_MethodHandle::is_instance(target())) {
1639 THROW(vmSymbols::java_lang_InternalError());
1640 }
1641
1642 java_dyn_MethodHandle::init_vmslots(mh());
1643
1644 if (VerifyMethodHandles) {
1645 int insert_after = argnum - 1;
1646 verify_vmargslot(mh, insert_after, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK);
1647 verify_vmslots(mh, CHECK);
1648 }
1649
1650 // Get bound type and required slots.
1651 oop ptype_oop = java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum);
1652 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop);
1653 int slots_pushed = type2size[ptype];
1654
1655 // If (a) the target is a direct non-dispatched method handle,
1656 // or (b) the target is a dispatched direct method handle and we
1657 // are binding the receiver, cut out the middle-man.
1658 // Do this by decoding the DMH and using its methodOop directly as vmtarget.
1659 bool direct_to_method = false;
1660 if (OptimizeMethodHandles &&
1661 target->klass() == SystemDictionary::DirectMethodHandle_klass() &&
1662 (argnum == 0 || sun_dyn_DirectMethodHandle::vmindex(target()) < 0)) {
1663 int decode_flags = 0; klassOop receiver_limit_oop = NULL;
1664 methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags));
1665 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); }
1666 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg.
1667 assert(sun_dyn_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig");
1668 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) {
1669 KlassHandle receiver_limit(THREAD, receiver_limit_oop);
1670 init_BoundMethodHandle_with_receiver(mh, m,
1671 receiver_limit, decode_flags,
1672 CHECK);
1673 return;
1674 }
1675
1676 // Even if it is not a bound receiver, we still might be able
1677 // to bind another argument and still invoke the methodOop directly.
1678 if (!(decode_flags & _dmf_does_dispatch)) {
1679 direct_to_method = true;
1680 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m());
1681 }
1682 }
1683 if (!direct_to_method)
1684 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), target());
1685
1686 if (VerifyMethodHandles) {
1687 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK);
1688 }
1689
1690 // Next question: Is this a ref, int, or long bound value?
1691 MethodHandleEntry* me = NULL;
1692 if (ptype == T_OBJECT) {
1693 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh);
1694 else me = MethodHandles::entry(_bound_ref_mh);
1695 } else if (slots_pushed == 2) {
1696 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh);
1697 else me = MethodHandles::entry(_bound_long_mh);
1698 } else if (slots_pushed == 1) {
1699 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh);
1700 else me = MethodHandles::entry(_bound_int_mh);
1701 } else {
1702 assert(false, "");
1703 }
1704
1705 // Done!
1706 java_dyn_MethodHandle::set_vmentry(mh(), me);
1707 }
1708
1709 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) {
1710 char msg[200];
1711 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err);
1712 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg);
1713 }
1714
1715 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) {
1716 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh());
1717 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh());
1718
1719 verify_vmargslot(mh, argnum, argslot, CHECK);
1720 verify_vmslots(mh, CHECK);
1721
1722 jint conv_op = adapter_conversion_op(conversion);
1723 if (!conv_op_valid(conv_op)) {
1724 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD);
1725 return;
1726 }
1727 EntryKind ek = adapter_entry_kind(conv_op);
1728
1729 int stack_move = adapter_conversion_stack_move(conversion);
1730 BasicType src = adapter_conversion_src_type(conversion);
1731 BasicType dest = adapter_conversion_dest_type(conversion);
1732 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
1733
1734 Handle argument(THREAD, sun_dyn_AdapterMethodHandle::argument(mh()));
1735 Handle target(THREAD, sun_dyn_AdapterMethodHandle::vmtarget(mh()));
1736 Handle src_mtype(THREAD, java_dyn_MethodHandle::type(mh()));
1737 Handle dst_mtype(THREAD, java_dyn_MethodHandle::type(target()));
1738
1739 const char* err = NULL;
1740
1741 if (err == NULL) {
1742 // Check that the correct argument is supplied, but only if it is required.
1743 switch (ek) {
1744 case _adapter_check_cast: // target type of cast
1745 case _adapter_ref_to_prim: // wrapper type from which to unbox
1746 case _adapter_prim_to_ref: // wrapper type to box into
1747 case _adapter_collect_args: // array type to collect into
1748 case _adapter_spread_args: // array type to spread from
1749 if (!java_lang_Class::is_instance(argument())
1750 || java_lang_Class::is_primitive(argument()))
1751 { err = "adapter requires argument of type java.lang.Class"; break; }
1752 if (ek == _adapter_collect_args ||
1753 ek == _adapter_spread_args) {
1754 // Make sure it is a suitable collection type. (Array, for now.)
1755 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument()));
1756 if (!ak->oop_is_objArray()) {
1757 { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; }
1758 }
1759 }
1760 break;
1761 case _adapter_flyby:
1762 case _adapter_ricochet:
1763 if (!java_dyn_MethodHandle::is_instance(argument()))
1764 { err = "MethodHandle adapter argument required"; break; }
1765 break;
1766 default:
1767 if (argument.not_null())
1768 { err = "adapter has spurious argument"; break; }
1769 break;
1770 }
1771 }
1772
1773 if (err == NULL) {
1774 // Check that the src/dest types are supplied if needed.
1775 switch (ek) {
1776 case _adapter_check_cast:
1777 if (src != T_OBJECT || dest != T_OBJECT) {
1778 err = "adapter requires object src/dest conversion subfields";
1779 }
1780 break;
1781 case _adapter_prim_to_prim:
1782 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) {
1783 err = "adapter requires primitive src/dest conversion subfields"; break;
1784 }
1785 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) ||
1786 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) {
1787 err = "adapter cannot convert beween floating and fixed-point"; break;
1788 }
1789 break;
1790 case _adapter_ref_to_prim:
1791 if (src != T_OBJECT || !is_java_primitive(dest)
1792 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) {
1793 err = "adapter requires primitive dest conversion subfield"; break;
1794 }
1795 break;
1796 case _adapter_prim_to_ref:
1797 if (!is_java_primitive(src) || dest != T_OBJECT
1798 || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) {
1799 err = "adapter requires primitive src conversion subfield"; break;
1800 }
1801 break;
1802 case _adapter_swap_args:
1803 case _adapter_rot_args:
1804 {
1805 if (!src || src != dest) {
1806 err = "adapter requires src/dest conversion subfields for swap"; break;
1807 }
1808 int swap_size = type2size[src];
1809 oop src_mtype = sun_dyn_AdapterMethodHandle::type(mh());
1810 oop dest_mtype = sun_dyn_AdapterMethodHandle::type(target());
1811 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(target());
1812 int src_slot = argslot;
1813 int dest_slot = vminfo;
1814 bool rotate_up = (src_slot > dest_slot); // upward rotation
1815 int src_arg = argnum;
1816 int dest_arg = argument_slot_to_argnum(dest_mtype, dest_slot);
1817 verify_vmargslot(mh, dest_arg, dest_slot, CHECK);
1818 if (!(dest_slot >= src_slot + swap_size) &&
1819 !(src_slot >= dest_slot + swap_size)) {
1820 err = "source, destination slots must be distinct";
1821 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) {
1822 err = "source of swap must be deeper in stack";
1823 } else if (ek == _adapter_swap_args) {
1824 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, dest_arg),
1825 java_dyn_MethodType::ptype(dest_mtype, src_arg),
1826 dest_arg);
1827 } else if (ek == _adapter_rot_args) {
1828 if (rotate_up) {
1829 assert((src_slot > dest_slot) && (src_arg < dest_arg), "");
1830 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot]
1831 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1]
1832 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) {
1833 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i),
1834 java_dyn_MethodType::ptype(dest_mtype, i-1),
1835 i);
1836 }
1837 } else { // rotate down
1838 assert((src_slot < dest_slot) && (src_arg > dest_arg), "");
1839 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss]
1840 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg]
1841 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) {
1842 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i),
1843 java_dyn_MethodType::ptype(dest_mtype, i+1),
1844 i);
1845 }
1846 }
1847 }
1848 if (err == NULL)
1849 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, src_arg),
1850 java_dyn_MethodType::ptype(dest_mtype, dest_arg),
1851 src_arg);
1852 }
1853 break;
1854 case _adapter_collect_args:
1855 case _adapter_spread_args:
1856 {
1857 BasicType coll_type = (ek == _adapter_collect_args) ? dest : src;
1858 BasicType elem_type = (ek == _adapter_collect_args) ? src : dest;
1859 if (coll_type != T_OBJECT || elem_type != T_OBJECT) {
1860 err = "adapter requires src/dest subfields"; break;
1861 // later:
1862 // - consider making coll be a primitive array
1863 // - consider making coll be a heterogeneous collection
1864 }
1865 }
1866 break;
1867 default:
1868 if (src != 0 || dest != 0) {
1869 err = "adapter has spurious src/dest conversion subfields"; break;
1870 }
1871 break;
1872 }
1873 }
1874
1875 if (err == NULL) {
1876 // Check the stack_move subfield.
1877 // It must always report the net change in stack size, positive or negative.
1878 int slots_pushed = stack_move / stack_move_unit();
1879 switch (ek) {
1880 case _adapter_prim_to_prim:
1881 case _adapter_ref_to_prim:
1882 case _adapter_prim_to_ref:
1883 if (slots_pushed != type2size[dest] - type2size[src]) {
1884 err = "wrong stack motion for primitive conversion";
1885 }
1886 break;
1887 case _adapter_dup_args:
1888 if (slots_pushed <= 0) {
1889 err = "adapter requires conversion subfield slots_pushed > 0";
1890 }
1891 break;
1892 case _adapter_drop_args:
1893 if (slots_pushed >= 0) {
1894 err = "adapter requires conversion subfield slots_pushed < 0";
1895 }
1896 break;
1897 case _adapter_collect_args:
1898 if (slots_pushed > 1) {
1899 err = "adapter requires conversion subfield slots_pushed <= 1";
1900 }
1901 break;
1902 case _adapter_spread_args:
1903 if (slots_pushed < -1) {
1904 err = "adapter requires conversion subfield slots_pushed >= -1";
1905 }
1906 break;
1907 default:
1908 if (stack_move != 0) {
1909 err = "adapter has spurious stack_move conversion subfield";
1910 }
1911 break;
1912 }
1913 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) {
1914 err = "stack_move conversion subfield must be multiple of stack_move_unit";
1915 }
1916 }
1917
1918 if (err == NULL) {
1919 // Make sure this adapter does not push too deeply.
1920 int slots_pushed = stack_move / stack_move_unit();
1921 int this_vmslots = java_dyn_MethodHandle::vmslots(mh());
1922 int target_vmslots = java_dyn_MethodHandle::vmslots(target());
1923 if (slots_pushed != (target_vmslots - this_vmslots)) {
1924 err = "stack_move inconsistent with previous and current MethodType vmslots";
1925 } else if (slots_pushed > 0) {
1926 // verify stack_move against MethodHandlePushLimit
1927 int target_pushes = decode_MethodHandle_stack_pushes(target());
1928 // do not blow the stack; use a Java-based adapter if this limit is exceeded
1929 if (slots_pushed + target_pushes > MethodHandlePushLimit) {
1930 err = "adapter pushes too many parameters";
1931 }
1932 }
1933
1934 // While we're at it, check that the stack motion decoder works:
1935 DEBUG_ONLY(int target_pushes = decode_MethodHandle_stack_pushes(target()));
1936 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1937 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct");
1938 }
1939
1940 if (err == NULL && vminfo != 0) {
1941 switch (ek) {
1942 case _adapter_swap_args:
1943 case _adapter_rot_args:
1944 break; // OK
1945 default:
1946 err = "vminfo subfield is reserved to the JVM";
1947 }
1948 }
1949
1950 // Do additional ad hoc checks.
1951 if (err == NULL) {
1952 switch (ek) {
1953 case _adapter_retype_only:
1954 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false);
1955 break;
1956
1957 case _adapter_retype_raw:
1958 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true);
1959 break;
1960
1961 case _adapter_check_cast:
1962 {
1963 // The actual value being checked must be a reference:
1964 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype(), argnum),
1965 object_java_mirror(), argnum);
1966 if (err != NULL) break;
1967
1968 // The output of the cast must fit with the destination argument:
1969 Handle cast_class = argument;
1970 err = check_method_type_conversion(src_mtype(),
1971 argnum, cast_class(),
1972 dst_mtype());
1973 }
1974 break;
1975
1976 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles
1977 }
1978 }
1979
1980 if (err != NULL) {
1981 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
1982 return;
1983 }
1984
1985 }
1986
1987 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
1988 oop argument = sun_dyn_AdapterMethodHandle::argument(mh());
1989 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh());
1990 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh());
1991 jint conv_op = adapter_conversion_op(conversion);
1992
1993 // adjust the adapter code to the internal EntryKind enumeration:
1994 EntryKind ek_orig = adapter_entry_kind(conv_op);
1995 EntryKind ek_opt = ek_orig; // may be optimized
1996
1997 // Finalize the vmtarget field (Java initialized it to null).
1998 if (!java_dyn_MethodHandle::is_instance(target())) {
1999 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD);
2000 return;
2001 }
2002 sun_dyn_AdapterMethodHandle::set_vmtarget(mh(), target());
2003
2004 if (VerifyMethodHandles) {
2005 verify_AdapterMethodHandle(mh, argnum, CHECK);
2006 }
2007
2008 int stack_move = adapter_conversion_stack_move(conversion);
2009 BasicType src = adapter_conversion_src_type(conversion);
2010 BasicType dest = adapter_conversion_dest_type(conversion);
2011 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
2012
2013 const char* err = NULL;
2014
2015 // Now it's time to finish the case analysis and pick a MethodHandleEntry.
2016 switch (ek_orig) {
2017 case _adapter_retype_only:
2018 case _adapter_retype_raw:
2019 case _adapter_check_cast:
2020 case _adapter_dup_args:
2021 case _adapter_drop_args:
2022 // these work fine via general case code
2023 break;
2024
2025 case _adapter_prim_to_prim:
2026 {
2027 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}.
2028 // And, the {float,double} -> {int,long} cases must be handled by Java.
2029 switch (type2size[src] *4+ type2size[dest]) {
2030 case 1 *4+ 1:
2031 assert(src == T_INT || is_subword_type(src), "source is not float");
2032 // Subword-related cases are int -> {boolean,byte,char,short}.
2033 ek_opt = _adapter_opt_i2i;
2034 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2035 break;
2036 case 2 *4+ 1:
2037 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) {
2038 ek_opt = _adapter_opt_l2i;
2039 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2040 } else if (src == T_DOUBLE && dest == T_FLOAT) {
2041 ek_opt = _adapter_opt_d2f;
2042 } else {
2043 assert(false, "");
2044 }
2045 break;
2046 case 1 *4+ 2:
2047 if (src == T_INT && dest == T_LONG) {
2048 ek_opt = _adapter_opt_i2l;
2049 } else if (src == T_FLOAT && dest == T_DOUBLE) {
2050 ek_opt = _adapter_opt_f2d;
2051 } else {
2052 assert(false, "");
2053 }
2054 break;
2055 default:
2056 assert(false, "");
2057 break;
2058 }
2059 }
2060 break;
2061
2062 case _adapter_ref_to_prim:
2063 {
2064 switch (type2size[dest]) {
2065 case 1:
2066 ek_opt = _adapter_opt_unboxi;
2067 vminfo = adapter_unbox_subword_vminfo(dest);
2068 break;
2069 case 2:
2070 ek_opt = _adapter_opt_unboxl;
2071 break;
2072 default:
2073 assert(false, "");
2074 break;
2075 }
2076 }
2077 break;
2078
2079 case _adapter_prim_to_ref:
2080 goto throw_not_impl; // allocates, hence could block
2081
2082 case _adapter_swap_args:
2083 case _adapter_rot_args:
2084 {
2085 int swap_slots = type2size[src];
2086 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(mh());
2087 int src_slot = argslot;
2088 int dest_slot = vminfo;
2089 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1;
2090 switch (swap_slots) {
2091 case 1:
2092 ek_opt = (!rotate ? _adapter_opt_swap_1 :
2093 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down);
2094 break;
2095 case 2:
2096 ek_opt = (!rotate ? _adapter_opt_swap_2 :
2097 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down);
2098 break;
2099 default:
2100 assert(false, "");
2101 break;
2102 }
2103 }
2104 break;
2105
2106 case _adapter_collect_args:
2107 goto throw_not_impl; // allocates, hence could block
2108
2109 case _adapter_spread_args:
2110 {
2111 // vminfo will be the required length of the array
2112 int slots_pushed = stack_move / stack_move_unit();
2113 int array_size = slots_pushed + 1;
2114 assert(array_size >= 0, "");
2115 vminfo = array_size;
2116 switch (array_size) {
2117 case 0: ek_opt = _adapter_opt_spread_0; break;
2118 case 1: ek_opt = _adapter_opt_spread_1; break;
2119 default: ek_opt = _adapter_opt_spread_more; break;
2120 }
2121 if ((vminfo & CONV_VMINFO_MASK) != vminfo)
2122 goto throw_not_impl; // overflow
2123 }
2124 break;
2125
2126 case _adapter_flyby:
2127 case _adapter_ricochet:
2128 goto throw_not_impl; // runs Java code, hence could block
2129
2130 default:
2131 // should have failed much earlier; must be a missing case here
2132 assert(false, "incomplete switch");
2133 // and fall through:
2134
2135 throw_not_impl:
2136 // FIXME: these adapters are NYI
2137 err = "adapter not yet implemented in the JVM";
2138 break;
2139 }
2140
2141 if (err != NULL) {
2142 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
2143 return;
2144 }
2145
2146 // Rebuild the conversion value; maybe parts of it were changed.
2147 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo);
2148
2149 // Finalize the conversion field. (Note that it is final to Java code.)
2150 sun_dyn_AdapterMethodHandle::set_conversion(mh(), new_conversion);
2151
2152 // Done!
2153 java_dyn_MethodHandle::set_vmentry(mh(), entry(ek_opt));
2154
2155 // There should be enough memory barriers on exit from native methods
2156 // to ensure that the MH is fully initialized to all threads before
2157 // Java code can publish it in global data structures.
2158 }
2159
2160 //
2161 // Here are the native methods on sun.dyn.MethodHandleImpl.
2162 // They are the private interface between this JVM and the HotSpot-specific
2163 // Java code that implements JSR 292 method handles.
2164 //
2165 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
2166 // that intrinsic (non-JNI) native methods are defined in HotSpot.
2167 //
2168
2169 // direct method handles for invokestatic or invokespecial
2170 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller);
2171 JVM_ENTRY(void, MHI_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2172 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) {
2173 ResourceMark rm; // for error messages
2174
2175 // This is the guy we are initializing:
2176 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2177 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2178
2179 // Early returns out of this method leave the DMH in an unfinished state.
2180 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2181
2182 // which method are we really talking about?
2183 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2184 oop target_oop = JNIHandles::resolve_non_null(target_jh);
2185 if (sun_dyn_MemberName::is_instance(target_oop) &&
2186 sun_dyn_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) {
2187 Handle mname(THREAD, target_oop);
2188 MethodHandles::resolve_MemberName(mname, CHECK);
2189 target_oop = mname(); // in case of GC
2190 }
2191
2192 int decode_flags = 0; klassOop receiver_limit = NULL;
2193 methodHandle m(THREAD,
2194 MethodHandles::decode_method(target_oop,
2195 receiver_limit, decode_flags));
2196 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); }
2197
2198 // The trusted Java code that calls this method should already have performed
2199 // access checks on behalf of the given caller. But, we can verify this.
2200 if (VerifyMethodHandles && caller_jh != NULL) {
2201 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)));
2202 // If this were a bytecode, the first access check would be against
2203 // the "reference class" mentioned in the CONSTANT_Methodref.
2204 // We don't know at this point which class that was, and if we
2205 // check against m.method_holder we might get the wrong answer.
2206 // So we just make sure to handle this check when the resolution
2207 // happens, when we call resolve_MemberName.
2208 //
2209 // (A public class can inherit public members from private supers,
2210 // and it would be wrong to check access against the private super
2211 // if the original symbolic reference was against the public class.)
2212 //
2213 // If there were a bytecode, the next step would be to lookup the method
2214 // in the reference class, then then check the method's access bits.
2215 // Emulate LinkResolver::check_method_accessability.
2216 klassOop resolved_klass = m->method_holder();
2217 if (!Reflection::verify_field_access(caller->as_klassOop(),
2218 resolved_klass, resolved_klass,
2219 m->access_flags(),
2220 true)) {
2221 // %%% following cutout belongs in Reflection::verify_field_access?
2222 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(),
2223 resolved_klass, THREAD);
2224 if (!same_pm) {
2225 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string());
2226 }
2227 }
2228 }
2229
2230 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK);
2231 }
2232 JVM_END
2233
2234 // bound method handles
2235 JVM_ENTRY(void, MHI_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2236 jobject target_jh, int argnum)) {
2237 ResourceMark rm; // for error messages
2238
2239 // This is the guy we are initializing:
2240 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2241 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2242
2243 // Early returns out of this method leave the BMH in an unfinished state.
2244 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2245
2246 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2247 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2248
2249 if (!java_dyn_MethodHandle::is_instance(target())) {
2250 // Target object is a reflective method. (%%% Do we need this alternate path?)
2251 Untested("init_BMH of non-MH");
2252 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); }
2253 int decode_flags = 0; klassOop receiver_limit_oop = NULL;
2254 methodHandle m(THREAD,
2255 MethodHandles::decode_method(target(),
2256 receiver_limit_oop,
2257 decode_flags));
2258 KlassHandle receiver_limit(THREAD, receiver_limit_oop);
2259 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m,
2260 receiver_limit,
2261 decode_flags,
2262 CHECK);
2263 return;
2264 }
2265
2266 // Build a BMH on top of a DMH or another BMH:
2267 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK);
2268 }
2269 JVM_END
2270
2271 // adapter method handles
2272 JVM_ENTRY(void, MHI_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2273 jobject target_jh, int argnum)) {
2274 // This is the guy we are initializing:
2275 if (mh_jh == NULL || target_jh == NULL) {
2276 THROW(vmSymbols::java_lang_InternalError());
2277 }
2278 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2279 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2280
2281 // Early returns out of this method leave the AMH in an unfinished state.
2282 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2283
2284 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK);
2285 }
2286 JVM_END
2287
2288 // method type forms
2289 JVM_ENTRY(void, MHI_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) {
2290 if (erased_jh == NULL) return;
2291 if (TraceMethodHandles) {
2292 tty->print("creating MethodType form ");
2293 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH!
2294 // call Object.toString()
2295 Symbol* name = vmSymbols::toString_name();
2296 Symbol* sig = vmSymbols::void_string_signature();
2297 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh)));
2298 JavaValue result(T_OBJECT);
2299 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig,
2300 &args, CHECK);
2301 Handle str(THREAD, (oop)result.get_jobject());
2302 java_lang_String::print(str, tty);
2303 }
2304 tty->cr();
2305 }
2306 }
2307 JVM_END
2308
2309 // debugging and reflection
2310 JVM_ENTRY(jobject, MHI_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) {
2311 Handle mh(THREAD, JNIHandles::resolve(mh_jh));
2312 if (!java_dyn_MethodHandle::is_instance(mh())) {
2313 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
2314 }
2315 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL);
2316 return JNIHandles::make_local(THREAD, target);
2317 }
2318 JVM_END
2319
2320 JVM_ENTRY(jint, MHI_getConstant(JNIEnv *env, jobject igcls, jint which)) {
2321 switch (which) {
2322 case MethodHandles::GC_JVM_PUSH_LIMIT:
2323 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF,
2324 "MethodHandlePushLimit parameter must be in valid range");
2325 return MethodHandlePushLimit;
2326 case MethodHandles::GC_JVM_STACK_MOVE_UNIT:
2327 // return number of words per slot, signed according to stack direction
2328 return MethodHandles::stack_move_unit();
2329 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK:
2330 return MethodHandles::adapter_conversion_ops_supported_mask();
2331 }
2332 return 0;
2333 }
2334 JVM_END
2335
2336 #ifndef PRODUCT
2337 #define EACH_NAMED_CON(template) \
2338 template(MethodHandles,GC_JVM_PUSH_LIMIT) \
2339 template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) \
2340 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \
2341 template(MethodHandles,ETF_DIRECT_HANDLE) \
2342 template(MethodHandles,ETF_METHOD_NAME) \
2343 template(MethodHandles,ETF_REFLECT_METHOD) \
2344 template(sun_dyn_MemberName,MN_IS_METHOD) \
2345 template(sun_dyn_MemberName,MN_IS_CONSTRUCTOR) \
2346 template(sun_dyn_MemberName,MN_IS_FIELD) \
2347 template(sun_dyn_MemberName,MN_IS_TYPE) \
2348 template(sun_dyn_MemberName,MN_SEARCH_SUPERCLASSES) \
2349 template(sun_dyn_MemberName,MN_SEARCH_INTERFACES) \
2350 template(sun_dyn_MemberName,VM_INDEX_UNINITIALIZED) \
2351 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_ONLY) \
2352 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_RAW) \
2353 template(sun_dyn_AdapterMethodHandle,OP_CHECK_CAST) \
2354 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_PRIM) \
2355 template(sun_dyn_AdapterMethodHandle,OP_REF_TO_PRIM) \
2356 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_REF) \
2357 template(sun_dyn_AdapterMethodHandle,OP_SWAP_ARGS) \
2358 template(sun_dyn_AdapterMethodHandle,OP_ROT_ARGS) \
2359 template(sun_dyn_AdapterMethodHandle,OP_DUP_ARGS) \
2360 template(sun_dyn_AdapterMethodHandle,OP_DROP_ARGS) \
2361 template(sun_dyn_AdapterMethodHandle,OP_COLLECT_ARGS) \
2362 template(sun_dyn_AdapterMethodHandle,OP_SPREAD_ARGS) \
2363 template(sun_dyn_AdapterMethodHandle,OP_FLYBY) \
2364 template(sun_dyn_AdapterMethodHandle,OP_RICOCHET) \
2365 template(sun_dyn_AdapterMethodHandle,CONV_OP_LIMIT) \
2366 template(sun_dyn_AdapterMethodHandle,CONV_OP_MASK) \
2367 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_MASK) \
2368 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_SHIFT) \
2369 template(sun_dyn_AdapterMethodHandle,CONV_OP_SHIFT) \
2370 template(sun_dyn_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \
2371 template(sun_dyn_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \
2372 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \
2373 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \
2374 /*end*/
2375
2376 #define ONE_PLUS(scope,value) 1+
2377 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0;
2378 #define VALUE_COMMA(scope,value) scope::value,
2379 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 };
2380 #define STRING_NULL(scope,value) #value "\0"
2381 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) };
2382
2383 #undef ONE_PLUS
2384 #undef VALUE_COMMA
2385 #undef STRING_NULL
2386 #undef EACH_NAMED_CON
2387 #endif
2388
2389 JVM_ENTRY(jint, MHI_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
2390 #ifndef PRODUCT
2391 if (which >= 0 && which < con_value_count) {
2392 int con = con_values[which];
2393 objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh);
2394 if (box != NULL && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
2395 const char* str = &con_names[0];
2396 for (int i = 0; i < which; i++)
2397 str += strlen(str) + 1; // skip name and null
2398 oop name = java_lang_String::create_oop_from_str(str, CHECK_0);
2399 box->obj_at_put(0, name);
2400 }
2401 return con;
2402 }
2403 #endif
2404 return 0;
2405 }
2406 JVM_END
2407
2408 // void init(MemberName self, AccessibleObject ref)
2409 JVM_ENTRY(void, MHI_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
2410 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2411 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2412 oop target_oop = JNIHandles::resolve_non_null(target_jh);
2413 MethodHandles::init_MemberName(mname(), target_oop);
2414 }
2415 JVM_END
2416
2417 // void expand(MemberName self)
2418 JVM_ENTRY(void, MHI_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
2419 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2420 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2421 MethodHandles::expand_MemberName(mname, 0, CHECK);
2422 }
2423 JVM_END
2424
2425 // void resolve(MemberName self, Class<?> caller)
2426 JVM_ENTRY(void, MHI_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
2427 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2428 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2429
2430 // The trusted Java code that calls this method should already have performed
2431 // access checks on behalf of the given caller. But, we can verify this.
2432 if (VerifyMethodHandles && caller_jh != NULL) {
2433 klassOop reference_klass = java_lang_Class::as_klassOop(sun_dyn_MemberName::clazz(mname()));
2434 if (reference_klass != NULL) {
2435 // Emulate LinkResolver::check_klass_accessability.
2436 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh));
2437 if (!Reflection::verify_class_access(caller,
2438 reference_klass,
2439 true)) {
2440 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name());
2441 }
2442 }
2443 }
2444
2445 MethodHandles::resolve_MemberName(mname, CHECK);
2446 }
2447 JVM_END
2448
2449 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
2450 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
2451 JVM_ENTRY(jint, MHI_getMembers(JNIEnv *env, jobject igcls,
2452 jclass clazz_jh, jstring name_jh, jstring sig_jh,
2453 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
2454 if (clazz_jh == NULL || results_jh == NULL) return -1;
2455 klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh));
2456
2457 objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh);
2458 if (results == NULL || !results->is_objArray()) return -1;
2459
2460 TempNewSymbol name = NULL;
2461 TempNewSymbol sig = NULL;
2462 if (name_jh != NULL) {
2463 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
2464 if (name == NULL) return 0; // a match is not possible
2465 }
2466 if (sig_jh != NULL) {
2467 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
2468 if (sig == NULL) return 0; // a match is not possible
2469 }
2470
2471 klassOop caller = NULL;
2472 if (caller_jh != NULL) {
2473 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
2474 if (!java_lang_Class::is_instance(caller_oop)) return -1;
2475 caller = java_lang_Class::as_klassOop(caller_oop);
2476 }
2477
2478 if (name != NULL && sig != NULL && results != NULL) {
2479 // try a direct resolve
2480 // %%% TO DO
2481 }
2482
2483 int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags,
2484 caller, skip, results);
2485 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
2486 return res;
2487 }
2488 JVM_END
2489
2490 JVM_ENTRY(void, MHI_registerBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh, jobject bsm_jh)) {
2491 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD);
2492 if (!AllowTransitionalJSR292) {
2493 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2494 "registerBootstrapMethod is only supported in JSR 292 EDR");
2495 }
2496 ik->link_class(CHECK);
2497 if (!java_dyn_MethodHandle::is_instance(JNIHandles::resolve(bsm_jh))) {
2498 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "method handle");
2499 }
2500 const char* err = NULL;
2501 if (ik->is_initialized() || ik->is_in_error_state()) {
2502 err = "too late: class is already initialized";
2503 } else {
2504 ObjectLocker ol(ik, THREAD); // note: this should be a recursive lock
2505 if (ik->is_not_initialized() ||
2506 (ik->is_being_initialized() && ik->is_reentrant_initialization(THREAD))) {
2507 if (ik->bootstrap_method() != NULL) {
2508 err = "class is already equipped with a bootstrap method";
2509 } else {
2510 ik->set_bootstrap_method(JNIHandles::resolve_non_null(bsm_jh));
2511 err = NULL;
2512 }
2513 } else {
2514 err = "class is already initialized";
2515 if (ik->is_being_initialized())
2516 err = "class is already being initialized in a different thread";
2517 }
2518 }
2519 if (err != NULL) {
2520 THROW_MSG(vmSymbols::java_lang_IllegalStateException(), err);
2521 }
2522 }
2523 JVM_END
2524
2525 JVM_ENTRY(jobject, MHI_getBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh)) {
2526 if (!AllowTransitionalJSR292)
2527 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "getBootstrap: transitional only");
2528 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD);
2529 return JNIHandles::make_local(THREAD, ik->bootstrap_method());
2530 }
2531 JVM_END
2532
2533 JVM_ENTRY(void, MHI_setCallSiteTarget(JNIEnv *env, jobject igcls, jobject site_jh, jobject target_jh)) {
2534 if (!AllowTransitionalJSR292)
2535 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "setCallSite: transitional only");
2536 }
2537 JVM_END
2538
2539
2540 /// JVM_RegisterMethodHandleMethods
2541
2542 #define ADR "J"
2543
2544 #define LANG "Ljava/lang/"
2545 #define JLINV "Ljava/lang/invoke/" /* standard package */
2546 #define JDYN "Ljava/dyn/" /* alternative package to JLINV if AllowTransitionalJSR292 */
2547 #define IDYN "Lsun/dyn/" /* alternative package to JDYN if AllowTransitionalJSR292 */
2548 // FIXME: After AllowTransitionalJSR292 is removed, replace JDYN and IDYN by JLINV.
2549
2550 #define OBJ LANG"Object;"
2551 #define CLS LANG"Class;"
2552 #define STRG LANG"String;"
2553 #define CST JDYN"CallSite;"
2554 #define MT JDYN"MethodType;"
2555 #define MH JDYN"MethodHandle;"
2556 #define MEM IDYN"MemberName;"
2557 #define AMH IDYN"AdapterMethodHandle;"
2558 #define BMH IDYN"BoundMethodHandle;"
2559 #define DMH IDYN"DirectMethodHandle;"
2560
2561 #define CC (char*) /*cast a literal from (const char*)*/
2562 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
2563
2564 // These are the native methods on sun.dyn.MethodHandleNatives.
2565 static JNINativeMethod methods[] = {
2566 // void init(MemberName self, AccessibleObject ref)
2567 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHI_init_AMH)},
2568 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHI_init_BMH)},
2569 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHI_init_DMH)},
2570 {CC"init", CC"("MT")V", FN_PTR(MHI_init_MT)},
2571 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHI_init_Mem)},
2572 {CC"expand", CC"("MEM")V", FN_PTR(MHI_expand_Mem)},
2573 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHI_resolve_Mem)},
2574 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHI_getTarget)},
2575 {CC"getConstant", CC"(I)I", FN_PTR(MHI_getConstant)},
2576 // static native int getNamedCon(int which, Object[] name)
2577 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHI_getNamedCon)},
2578 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
2579 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
2580 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHI_getMembers)}
2581 };
2582
2583 // More entry points specifically for EnableInvokeDynamic.
2584 // FIXME: Remove methods2 after AllowTransitionalJSR292 is removed.
2585 static JNINativeMethod methods2[] = {
2586 {CC"registerBootstrap", CC"("CLS MH")V", FN_PTR(MHI_registerBootstrap)},
2587 {CC"getBootstrap", CC"("CLS")"MH, FN_PTR(MHI_getBootstrap)},
2588 {CC"setCallSiteTarget", CC"("CST MH")V", FN_PTR(MHI_setCallSiteTarget)}
2589 };
2590
2591 static void hack_signatures(JNINativeMethod* methods, jint num_methods, const char* from_sig, const char* to_sig) {
2592 for (int i = 0; i < num_methods; i++) {
2593 const char* sig = methods[i].signature;
2594 if (!strstr(sig, from_sig)) continue;
2595 size_t buflen = strlen(sig) + 100;
2596 char* buf = NEW_C_HEAP_ARRAY(char, buflen);
2597 char* bufp = buf;
2598 const char* sigp = sig;
2599 size_t from_len = strlen(from_sig), to_len = strlen(to_sig);
2600 while (*sigp != '\0') {
2601 assert(bufp < buf + buflen - to_len - 1, "oob");
2602 if (strncmp(sigp, from_sig, from_len) != 0) {
2603 *bufp++ = *sigp++;
2604 } else {
2605 strcpy(bufp, to_sig);
2606 bufp += to_len;
2607 sigp += from_len;
2608 }
2609 }
2610 *bufp = '\0';
2611 methods[i].signature = buf; // replace with new signature
2612 if (TraceMethodHandles)
2613 tty->print_cr("MethodHandleNatives: %s: change signature %s => %s", methods[i].name, sig, buf);
2614 }
2615 }
2616
2617 // This one function is exported, used by NativeLookup.
2618
2619 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
2620 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK");
2621
2622 // note: this explicit warning-producing stuff will be replaced by auto-detection of the JSR 292 classes
2623
2624 if (!EnableMethodHandles) {
2625 warning("JSR 292 method handles are disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableMethodHandles to enable.");
2626 return; // bind nothing
2627 }
2628
2629 if (SystemDictionary::MethodHandleNatives_klass() != NULL &&
2630 SystemDictionary::MethodHandleNatives_klass() != java_lang_Class::as_klassOop(JNIHandles::resolve(MHN_class))) {
2631 warning("multiple versions of MethodHandleNatives in boot classpath; consider using -XX:+PreferTransitionalJSR292");
2632 THROW_MSG(vmSymbols::java_lang_InternalError(), "multiple versions of MethodHandleNatives in boot classpath; consider using -XX:+PreferTransitionalJSR292");
2633 }
2634
2635 bool enable_MH = true;
2636
2637 // Loop control. FIXME: Replace by dead reckoning after AllowTransitionalJSR292 is removed.
2638 bool registered_natives = false;
2639 bool try_plain = true, try_JDYN = true, try_IDYN = true;
2640 for (;;) {
2641 ThreadToNativeFromVM ttnfv(thread);
2642
2643 if (try_plain) { try_plain = false; }
2644 else if (try_JDYN) { try_JDYN = false; hack_signatures(methods, sizeof(methods)/sizeof(JNINativeMethod), IDYN, JDYN); }
2645 else if (try_IDYN) { try_IDYN = false; hack_signatures(methods, sizeof(methods)/sizeof(JNINativeMethod), JDYN, JLINV); }
2646 else { break; }
2647 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod));
2648 if (env->ExceptionOccurred()) {
2649 env->ExceptionClear();
2650 // and try again...
2651 } else {
2652 registered_natives = true;
2653 break;
2654 }
2655 }
2656 if (!registered_natives) {
2657 MethodHandles::set_enabled(false);
2658 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
2659 enable_MH = false;
2660 }
2661
2662 if (enable_MH) {
2663 bool found_raise_exception = false;
2664 KlassHandle MHN_klass = SystemDictionaryHandles::MethodHandleNatives_klass();
2665 KlassHandle MHI_klass = SystemDictionaryHandles::MethodHandleImpl_klass();
2666 // Loop control. FIXME: Replace by dead reckoning after AllowTransitionalJSR292 is removed.
2667 bool try_MHN = true, try_MHI = AllowTransitionalJSR292;
2668 for (;;) {
2669 KlassHandle try_klass;
2670 if (try_MHN) { try_MHN = false; try_klass = MHN_klass; }
2671 else if (try_MHI) { try_MHI = false; try_klass = MHI_klass; }
2672 else { break; }
2673 if (try_klass.is_null()) continue;
2674 TempNewSymbol raiseException_name = SymbolTable::new_symbol("raiseException", CHECK);
2675 TempNewSymbol raiseException_sig = SymbolTable::new_symbol("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK);
2676 methodOop raiseException_method = instanceKlass::cast(try_klass->as_klassOop())
2677 ->find_method(raiseException_name, raiseException_sig);
2678 if (raiseException_method != NULL && raiseException_method->is_static()) {
2679 MethodHandles::set_raise_exception_method(raiseException_method);
2680 found_raise_exception = true;
2681 break;
2682 }
2683 }
2684 if (!found_raise_exception) {
2685 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
2686 enable_MH = false;
2687 }
2688 }
2689
2690 if (enable_MH) {
2691 if (AllowTransitionalJSR292) {
2692 // We need to link the MethodHandleImpl klass before we generate
2693 // the method handle adapters as the _raise_exception adapter uses
2694 // one of its methods (and its c2i-adapter).
2695 KlassHandle k = SystemDictionaryHandles::MethodHandleImpl_klass();
2696 instanceKlass* ik = instanceKlass::cast(k());
2697 ik->link_class(CHECK);
2698 }
2699
2700 MethodHandles::generate_adapters();
2701 MethodHandles::set_enabled(true);
2702 }
2703
2704 if (!EnableInvokeDynamic) {
2705 warning("JSR 292 invokedynamic is disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableInvokeDynamic to enable.");
2706 return; // bind nothing
2707 }
2708
2709 if (AllowTransitionalJSR292) {
2710 ThreadToNativeFromVM ttnfv(thread);
2711
2712 int status = env->RegisterNatives(MHN_class, methods2, sizeof(methods2)/sizeof(JNINativeMethod));
2713 if (env->ExceptionOccurred()) {
2714 MethodHandles::set_enabled(false);
2715 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
2716 env->ExceptionClear();
2717 }
2718 }
2719 }
2720 JVM_END