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 (!EnableInvokeDynamic || 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 && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
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_lang_invoke_MethodType::is_instance(mtype)) {
167 // Extract receiver type restriction from mtype.ptypes[0].
168 objArrayOop ptypes = java_lang_invoke_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 = java_lang_invoke_DirectMethodHandle::vmtarget(mh);
203 int vmindex = java_lang_invoke_DirectMethodHandle::vmindex(mh);
204 oop mtype = java_lang_invoke_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(java_lang_invoke_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_lang_invoke_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_lang_invoke_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(java_lang_invoke_AdapterMethodHandle::conversion(amh));
244 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK;
245 oop target = java_lang_invoke_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_lang_invoke_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 (java_lang_invoke_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_lang_invoke_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(!java_lang_invoke_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_lang_invoke_MethodHandle::vmslots(mh);
340 int last_vmslots = 0;
341 oop last_mh = mh;
342 for (;;) {
343 oop target = java_lang_invoke_MethodHandle::vmtarget(last_mh);
344 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
345 last_vmslots = java_lang_invoke_MethodHandle::vmslots(target);
346 break;
347 } else if (!java_lang_invoke_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 java_lang_invoke_MemberName.*
365 enum {
366 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
367 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
368 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
369 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
370 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
371 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
372 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE,
373 VM_INDEX_UNINITIALIZED = java_lang_invoke_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 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
409 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
410 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
411 java_lang_invoke_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 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
420 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
421 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
422 java_lang_invoke_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 = java_lang_invoke_MemberName::flags(mname);
428 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return NULL; // not invocable
429 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname);
430 int vmindex = java_lang_invoke_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 = java_lang_invoke_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_lang_invoke_MethodType::is_instance(type_str)) {
446 return java_lang_invoke_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(java_lang_invoke_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 (java_lang_invoke_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED)
476 return; // already resolved
477 oop defc_oop = java_lang_invoke_MemberName::clazz(mname());
478 oop name_str = java_lang_invoke_MemberName::name(mname());
479 oop type_str = java_lang_invoke_MemberName::type(mname());
480 int flags = java_lang_invoke_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_lang_invoke_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 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
561 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
562 java_lang_invoke_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 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
590 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
591 java_lang_invoke_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 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
609 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
610 java_lang_invoke_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_lang_invoke_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_lang_invoke_MethodType::ptype(polymorphic_method_type(), i);
625 else type_mirror = java_lang_invoke_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 java_lang_invoke_MemberName::set_vmtarget(mname(), m);
643 java_lang_invoke_MemberName::set_vmindex(mname(), m->vtable_index());
644 java_lang_invoke_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(java_lang_invoke_MemberName::is_instance(mname()), "");
657 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
658 int vmindex = java_lang_invoke_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 = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
664 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
665 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
666 int flags = java_lang_invoke_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 java_lang_invoke_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 java_lang_invoke_MemberName::set_name(mname(), name());
696 }
697 if (!have_type) {
698 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
699 java_lang_invoke_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 java_lang_invoke_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 java_lang_invoke_MemberName::set_name(mname(), name());
720 }
721 if (!have_type) {
722 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
723 java_lang_invoke_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 (!java_lang_invoke_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 (!java_lang_invoke_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_lang_invoke_MethodHandle::is_instance(mh()), "must be a MH");
861 if (format == ETF_HANDLE_OR_METHOD_NAME) {
862 oop target = java_lang_invoke_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_lang_invoke_MethodHandle::is_instance(target)){
878 return NULL; // unformed MH
879 }
880 target = java_lang_invoke_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 java_lang_invoke_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 "sun/invoke/empty/Empty",
927 NULL
928 };
929
930 static bool is_always_null_type(klassOop klass) {
931 if (!Klass::cast(klass)->oop_is_instance()) return false;
932 instanceKlass* ik = instanceKlass::cast(klass);
933 // Must be on the boot class path:
934 if (ik->class_loader() != NULL) return false;
935 // Check the name.
936 Symbol* name = ik->name();
937 for (int i = 0; ; i++) {
938 const char* test_name = always_null_names[i];
939 if (test_name == NULL) break;
940 if (name->equals(test_name))
941 return true;
942 }
943 return false;
944 }
945
946 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) {
947 if (src == dst || dst == SystemDictionary::Object_klass())
948 return false; // quickest checks
949 Klass* srck = Klass::cast(src);
950 Klass* dstk = Klass::cast(dst);
951 if (dstk->is_interface()) {
952 // interface receivers can safely be viewed as untyped,
953 // because interface calls always include a dynamic check
954 //dstk = Klass::cast(SystemDictionary::Object_klass());
955 return false;
956 }
957 if (srck->is_interface()) {
958 // interface arguments must be viewed as untyped
959 //srck = Klass::cast(SystemDictionary::Object_klass());
960 return true;
961 }
962 if (is_always_null_type(src)) {
963 // some source types are known to be never instantiated;
964 // they represent references which are always null
965 // such null references never fail to convert safely
966 return false;
967 }
968 return !srck->is_subclass_of(dstk->as_klassOop());
969 }
970
971 static oop object_java_mirror() {
972 return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
973 }
974
975 bool MethodHandles::same_basic_type_for_arguments(BasicType src,
976 BasicType dst,
977 bool raw,
978 bool for_return) {
979 if (for_return) {
980 // return values can always be forgotten:
981 if (dst == T_VOID) return true;
982 if (src == T_VOID) return raw && (dst == T_INT);
983 // We allow caller to receive a garbage int, which is harmless.
984 // This trick is pulled by trusted code (see VerifyType.canPassRaw).
985 }
986 assert(src != T_VOID && dst != T_VOID, "should not be here");
987 if (src == dst) return true;
988 if (type2size[src] != type2size[dst]) return false;
989 if (src == T_OBJECT || dst == T_OBJECT) return false;
990 if (raw) return true; // bitwise reinterpretation; caller guarantees safety
991 // allow reinterpretation casts for integral widening
992 if (is_subword_type(src)) { // subwords can fit in int or other subwords
993 if (dst == T_INT) // any subword fits in an int
994 return true;
995 if (src == T_BOOLEAN) // boolean fits in any subword
996 return is_subword_type(dst);
997 if (src == T_BYTE && dst == T_SHORT)
998 return true; // remaining case: byte fits in short
999 }
1000 // allow float/fixed reinterpretation casts
1001 if (src == T_FLOAT) return dst == T_INT;
1002 if (src == T_INT) return dst == T_FLOAT;
1003 if (src == T_DOUBLE) return dst == T_LONG;
1004 if (src == T_LONG) return dst == T_DOUBLE;
1005 return false;
1006 }
1007
1008 const char* MethodHandles::check_method_receiver(methodOop m,
1009 klassOop passed_recv_type) {
1010 assert(!m->is_static(), "caller resp.");
1011 if (passed_recv_type == NULL)
1012 return "receiver type is primitive";
1013 if (class_cast_needed(passed_recv_type, m->method_holder())) {
1014 Klass* formal = Klass::cast(m->method_holder());
1015 return SharedRuntime::generate_class_cast_message("receiver type",
1016 formal->external_name());
1017 }
1018 return NULL; // checks passed
1019 }
1020
1021 // Verify that m's signature can be called type-safely by a method handle
1022 // of the given method type 'mtype'.
1023 // It takes a TRAPS argument because it must perform symbol lookups.
1024 void MethodHandles::verify_method_signature(methodHandle m,
1025 Handle mtype,
1026 int first_ptype_pos,
1027 KlassHandle insert_ptype,
1028 TRAPS) {
1029 objArrayHandle ptypes(THREAD, java_lang_invoke_MethodType::ptypes(mtype()));
1030 int pnum = first_ptype_pos;
1031 int pmax = ptypes->length();
1032 int mnum = 0; // method argument
1033 const char* err = NULL;
1034 ResourceMark rm(THREAD);
1035 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
1036 oop ptype_oop = NULL;
1037 if (ss.at_return_type()) {
1038 if (pnum != pmax)
1039 { err = "too many arguments"; break; }
1040 ptype_oop = java_lang_invoke_MethodType::rtype(mtype());
1041 } else {
1042 if (pnum >= pmax)
1043 { err = "not enough arguments"; break; }
1044 if (pnum >= 0)
1045 ptype_oop = ptypes->obj_at(pnum);
1046 else if (insert_ptype.is_null())
1047 ptype_oop = NULL;
1048 else
1049 ptype_oop = insert_ptype->java_mirror();
1050 pnum += 1;
1051 mnum += 1;
1052 }
1053 klassOop pklass = NULL;
1054 BasicType ptype = T_OBJECT;
1055 if (ptype_oop != NULL)
1056 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass);
1057 else
1058 // null does not match any non-reference; use Object to report the error
1059 pklass = SystemDictionary::Object_klass();
1060 klassOop mklass = NULL;
1061 BasicType mtype = ss.type();
1062 if (mtype == T_ARRAY) mtype = T_OBJECT; // fold all refs to T_OBJECT
1063 if (mtype == T_OBJECT) {
1064 if (ptype_oop == NULL) {
1065 // null matches any reference
1066 continue;
1067 }
1068 KlassHandle pklass_handle(THREAD, pklass); pklass = NULL;
1069 // If we fail to resolve types at this point, we will throw an error.
1070 Symbol* name = ss.as_symbol(CHECK);
1071 instanceKlass* mk = instanceKlass::cast(m->method_holder());
1072 Handle loader(THREAD, mk->class_loader());
1073 Handle domain(THREAD, mk->protection_domain());
1074 mklass = SystemDictionary::resolve_or_null(name, loader, domain, CHECK);
1075 pklass = pklass_handle();
1076 if (mklass == NULL && pklass != NULL &&
1077 Klass::cast(pklass)->name() == name &&
1078 m->is_method_handle_invoke()) {
1079 // Assume a match. We can't really decode the signature of MH.invoke*.
1080 continue;
1081 }
1082 }
1083 if (!ss.at_return_type()) {
1084 err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum);
1085 } else {
1086 err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal!
1087 }
1088 if (err != NULL) break;
1089 }
1090
1091 if (err != NULL) {
1092 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1093 }
1094 }
1095
1096 // Main routine for verifying the MethodHandle.type of a proposed
1097 // direct or bound-direct method handle.
1098 void MethodHandles::verify_method_type(methodHandle m,
1099 Handle mtype,
1100 bool has_bound_recv,
1101 KlassHandle bound_recv_type,
1102 TRAPS) {
1103 bool m_needs_receiver = !m->is_static();
1104
1105 const char* err = NULL;
1106
1107 int first_ptype_pos = m_needs_receiver ? 1 : 0;
1108 if (has_bound_recv) {
1109 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them
1110 if (m_needs_receiver && bound_recv_type.is_null())
1111 { err = "bound receiver is not an object"; goto die; }
1112 }
1113
1114 if (m_needs_receiver && err == NULL) {
1115 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype());
1116 if (ptypes->length() < first_ptype_pos)
1117 { err = "receiver argument is missing"; goto die; }
1118 if (has_bound_recv)
1119 err = check_method_receiver(m(), bound_recv_type->as_klassOop());
1120 else
1121 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1)));
1122 if (err != NULL) goto die;
1123 }
1124
1125 // Check the other arguments for mistypes.
1126 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK);
1127 return;
1128
1129 die:
1130 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1131 }
1132
1133 void MethodHandles::verify_vmslots(Handle mh, TRAPS) {
1134 // Verify vmslots.
1135 int check_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(mh()));
1136 if (java_lang_invoke_MethodHandle::vmslots(mh()) != check_slots) {
1137 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH");
1138 }
1139 }
1140
1141 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) {
1142 // Verify that argslot points at the given argnum.
1143 int check_slot = argument_slot(java_lang_invoke_MethodHandle::type(mh()), argnum);
1144 if (argslot != check_slot || argslot < 0) {
1145 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d";
1146 size_t msglen = strlen(fmt) + 3*11 + 1;
1147 char* msg = NEW_RESOURCE_ARRAY(char, msglen);
1148 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot);
1149 THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
1150 }
1151 }
1152
1153 // Verify the correspondence between two method types.
1154 // Apart from the advertised changes, caller method type X must
1155 // be able to invoke the callee method Y type with no violations
1156 // of type integrity.
1157 // Return NULL if all is well, else a short error message.
1158 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end,
1159 int insert_argnum, oop insert_type,
1160 int change_argnum, oop change_type,
1161 int delete_argnum,
1162 oop dst_mtype, int dst_beg, int dst_end,
1163 bool raw) {
1164 objArrayOop src_ptypes = java_lang_invoke_MethodType::ptypes(src_mtype);
1165 objArrayOop dst_ptypes = java_lang_invoke_MethodType::ptypes(dst_mtype);
1166
1167 int src_max = src_ptypes->length();
1168 int dst_max = dst_ptypes->length();
1169
1170 if (src_end == -1) src_end = src_max;
1171 if (dst_end == -1) dst_end = dst_max;
1172
1173 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob");
1174 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob");
1175
1176 // pending actions; set to -1 when done:
1177 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum;
1178
1179 const char* err = NULL;
1180
1181 // Walk along each array of parameter types, including a virtual
1182 // NULL end marker at the end of each.
1183 for (int src_idx = src_beg, dst_idx = dst_beg;
1184 (src_idx <= src_end && dst_idx <= dst_end);
1185 src_idx++, dst_idx++) {
1186 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx);
1187 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx);
1188 bool fix_null_src_type = false;
1189
1190 // Perform requested edits.
1191 if (ins_idx == src_idx) {
1192 // note that the inserted guy is never affected by a change or deletion
1193 ins_idx = -1;
1194 src_type = insert_type;
1195 fix_null_src_type = true;
1196 --src_idx; // back up to process src type on next loop
1197 src_idx = src_end;
1198 } else {
1199 // note that the changed guy can be immediately deleted
1200 if (chg_idx == src_idx) {
1201 chg_idx = -1;
1202 assert(src_idx < src_end, "oob");
1203 src_type = change_type;
1204 fix_null_src_type = true;
1205 }
1206 if (del_idx == src_idx) {
1207 del_idx = -1;
1208 assert(src_idx < src_end, "oob");
1209 --dst_idx;
1210 continue; // rerun loop after skipping this position
1211 }
1212 }
1213
1214 if (src_type == NULL && fix_null_src_type)
1215 // explicit null in this case matches any dest reference
1216 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type);
1217
1218 // Compare the two argument types.
1219 if (src_type != dst_type) {
1220 if (src_type == NULL) return "not enough arguments";
1221 if (dst_type == NULL) return "too many arguments";
1222 err = check_argument_type_change(src_type, dst_type, dst_idx, raw);
1223 if (err != NULL) return err;
1224 }
1225 }
1226
1227 // Now compare return types also.
1228 oop src_rtype = java_lang_invoke_MethodType::rtype(src_mtype);
1229 oop dst_rtype = java_lang_invoke_MethodType::rtype(dst_mtype);
1230 if (src_rtype != dst_rtype) {
1231 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal!
1232 if (err != NULL) return err;
1233 }
1234
1235 assert(err == NULL, "");
1236 return NULL; // all is well
1237 }
1238
1239
1240 const char* MethodHandles::check_argument_type_change(BasicType src_type,
1241 klassOop src_klass,
1242 BasicType dst_type,
1243 klassOop dst_klass,
1244 int argnum,
1245 bool raw) {
1246 const char* err = NULL;
1247 bool for_return = (argnum < 0);
1248
1249 // just in case:
1250 if (src_type == T_ARRAY) src_type = T_OBJECT;
1251 if (dst_type == T_ARRAY) dst_type = T_OBJECT;
1252
1253 // Produce some nice messages if VerifyMethodHandles is turned on:
1254 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) {
1255 if (src_type == T_OBJECT) {
1256 if (raw && dst_type == T_INT && is_always_null_type(src_klass))
1257 return NULL; // OK to convert a null pointer to a garbage int
1258 err = ((argnum >= 0)
1259 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s"
1260 : "type mismatch: returning a %s, but caller expects primitive %s");
1261 } else if (dst_type == T_OBJECT) {
1262 err = ((argnum >= 0)
1263 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s"
1264 : "type mismatch: returning a primitive %s, but caller expects %s");
1265 } else {
1266 err = ((argnum >= 0)
1267 ? "type mismatch: passing a %s for method argument #%d, which expects %s"
1268 : "type mismatch: returning a %s, but caller expects %s");
1269 }
1270 } else if (src_type == T_OBJECT && dst_type == T_OBJECT &&
1271 class_cast_needed(src_klass, dst_klass)) {
1272 if (!class_cast_needed(dst_klass, src_klass)) {
1273 if (raw)
1274 return NULL; // reverse cast is OK; the MH target is trusted to enforce it
1275 err = ((argnum >= 0)
1276 ? "cast required: passing a %s for method argument #%d, which expects %s"
1277 : "cast required: returning a %s, but caller expects %s");
1278 } else {
1279 err = ((argnum >= 0)
1280 ? "reference mismatch: passing a %s for method argument #%d, which expects %s"
1281 : "reference mismatch: returning a %s, but caller expects %s");
1282 }
1283 } else {
1284 // passed the obstacle course
1285 return NULL;
1286 }
1287
1288 // format, format, format
1289 const char* src_name = type2name(src_type);
1290 const char* dst_name = type2name(dst_type);
1291 if (src_type == T_OBJECT) src_name = Klass::cast(src_klass)->external_name();
1292 if (dst_type == T_OBJECT) dst_name = Klass::cast(dst_klass)->external_name();
1293 if (src_name == NULL) src_name = "unknown type";
1294 if (dst_name == NULL) dst_name = "unknown type";
1295
1296 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11);
1297 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1);
1298 if (argnum >= 0) {
1299 assert(strstr(err, "%d") != NULL, "");
1300 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name);
1301 } else {
1302 assert(strstr(err, "%d") == NULL, "");
1303 jio_snprintf(msg, msglen, err, src_name, dst_name);
1304 }
1305 return msg;
1306 }
1307
1308 // Compute the depth within the stack of the given argument, i.e.,
1309 // the combined size of arguments to the right of the given argument.
1310 // For the last argument (ptypes.length-1) this will be zero.
1311 // For the first argument (0) this will be the size of all
1312 // arguments but that one. For the special number -1, this
1313 // will be the size of all arguments, including the first.
1314 // If the argument is neither -1 nor a valid argument index,
1315 // then return a negative number. Otherwise, the result
1316 // is in the range [0..vmslots] inclusive.
1317 int MethodHandles::argument_slot(oop method_type, int arg) {
1318 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type);
1319 int argslot = 0;
1320 int len = ptypes->length();
1321 if (arg < -1 || arg >= len) return -99;
1322 for (int i = len-1; i > arg; i--) {
1323 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1324 argslot += type2size[bt];
1325 }
1326 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works");
1327 return argslot;
1328 }
1329
1330 // Given a slot number, return the argument number.
1331 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) {
1332 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type);
1333 int argslot = 0;
1334 int len = ptypes->length();
1335 for (int i = len-1; i >= 0; i--) {
1336 if (query_argslot == argslot) return i;
1337 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1338 argslot += type2size[bt];
1339 }
1340 // return pseudo-arg deepest in stack:
1341 if (query_argslot == argslot) return -1;
1342 return -99; // oob slot, or splitting a double-slot arg
1343 }
1344
1345 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m,
1346 KlassHandle receiver_limit,
1347 int decode_flags,
1348 KlassHandle receiver_klass,
1349 TRAPS) {
1350 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference");
1351 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument");
1352
1353 if (!m->is_static() &&
1354 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder())))
1355 // given type does not match class of method, or receiver is null!
1356 // caller should have checked this, but let's be extra careful...
1357 return methodHandle();
1358
1359 if (receiver_limit.not_null() &&
1360 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit())))
1361 // given type is not limited to the receiver type
1362 // note that a null receiver can match any reference value, for a static method
1363 return methodHandle();
1364
1365 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) {
1366 // pre-dispatched or static method (null receiver is OK for static)
1367 return m;
1368
1369 } else if (receiver_klass.is_null()) {
1370 // null receiver value; cannot dispatch
1371 return methodHandle();
1372
1373 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) {
1374 // perform virtual dispatch
1375 int vtable_index = m->vtable_index();
1376 guarantee(vtable_index >= 0, "valid vtable index");
1377
1378 // receiver_klass might be an arrayKlassOop but all vtables start at
1379 // the same place. The cast is to avoid virtual call and assertion.
1380 // See also LinkResolver::runtime_resolve_virtual_method.
1381 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass());
1382 DEBUG_ONLY(inst->verify_vtable_index(vtable_index));
1383 methodOop m_oop = inst->method_at_vtable(vtable_index);
1384 return methodHandle(THREAD, m_oop);
1385
1386 } else {
1387 // perform interface dispatch
1388 int itable_index = klassItable::compute_itable_index(m());
1389 guarantee(itable_index >= 0, "valid itable index");
1390 instanceKlass* inst = instanceKlass::cast(receiver_klass());
1391 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD);
1392 return methodHandle(THREAD, m_oop);
1393 }
1394 }
1395
1396 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) {
1397 // Verify type.
1398 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1399 verify_method_type(m, mtype, false, KlassHandle(), CHECK);
1400
1401 // Verify vmslots.
1402 if (java_lang_invoke_MethodHandle::vmslots(mh()) != m->size_of_parameters()) {
1403 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH");
1404 }
1405 }
1406
1407 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) {
1408 // Check arguments.
1409 if (mh.is_null() || m.is_null() ||
1410 (!do_dispatch && m->is_abstract())) {
1411 THROW(vmSymbols::java_lang_InternalError());
1412 }
1413
1414 java_lang_invoke_MethodHandle::init_vmslots(mh());
1415
1416 if (VerifyMethodHandles) {
1417 // The privileged code which invokes this routine should not make
1418 // a mistake about types, but it's better to verify.
1419 verify_DirectMethodHandle(mh, m, CHECK);
1420 }
1421
1422 // Finally, after safety checks are done, link to the target method.
1423 // We will follow the same path as the latter part of
1424 // InterpreterRuntime::resolve_invoke(), which first finds the method
1425 // and then decides how to populate the constant pool cache entry
1426 // that links the interpreter calls to the method. We need the same
1427 // bits, and will use the same calling sequence code.
1428
1429 int vmindex = methodOopDesc::garbage_vtable_index;
1430 oop vmtarget = NULL;
1431
1432 instanceKlass::cast(m->method_holder())->link_class(CHECK);
1433
1434 MethodHandleEntry* me = NULL;
1435 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) {
1436 // We are simulating an invokeinterface instruction.
1437 // (We might also be simulating an invokevirtual on a miranda method,
1438 // but it is safe to treat it as an invokeinterface.)
1439 assert(!m->can_be_statically_bound(), "no final methods on interfaces");
1440 vmindex = klassItable::compute_itable_index(m());
1441 assert(vmindex >= 0, "(>=0) == do_dispatch");
1442 // Set up same bits as ConstantPoolCacheEntry::set_interface_call().
1443 vmtarget = m->method_holder(); // the interface
1444 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh);
1445 } else if (!do_dispatch || m->can_be_statically_bound()) {
1446 // We are simulating an invokestatic or invokespecial instruction.
1447 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method().
1448 vmtarget = m();
1449 // this does not help dispatch, but it will make it possible to parse this MH:
1450 vmindex = methodOopDesc::nonvirtual_vtable_index;
1451 assert(vmindex < 0, "(>=0) == do_dispatch");
1452 if (!m->is_static()) {
1453 me = MethodHandles::entry(MethodHandles::_invokespecial_mh);
1454 } else {
1455 me = MethodHandles::entry(MethodHandles::_invokestatic_mh);
1456 // Part of the semantics of a static call is an initialization barrier.
1457 // For a DMH, it is done now, when the handle is created.
1458 Klass* k = Klass::cast(m->method_holder());
1459 if (k->should_be_initialized()) {
1460 k->initialize(CHECK);
1461 }
1462 }
1463 } else {
1464 // We are simulating an invokevirtual instruction.
1465 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method().
1466 // The key logic is LinkResolver::runtime_resolve_virtual_method.
1467 vmindex = m->vtable_index();
1468 vmtarget = m->method_holder();
1469 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh);
1470 }
1471
1472 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
1473
1474 java_lang_invoke_DirectMethodHandle::set_vmtarget(mh(), vmtarget);
1475 java_lang_invoke_DirectMethodHandle::set_vmindex(mh(), vmindex);
1476 DEBUG_ONLY(int flags; klassOop rlimit);
1477 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(),
1478 "properly stored for later decoding");
1479 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0));
1480 assert(!(actual_do_dispatch && !do_dispatch),
1481 "do not perform dispatch if !do_dispatch specified");
1482 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch");
1483 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack");
1484
1485 // Done!
1486 java_lang_invoke_MethodHandle::set_vmentry(mh(), me);
1487 }
1488
1489 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh,
1490 methodHandle m,
1491 TRAPS) {
1492 // Verify type.
1493 oop receiver = java_lang_invoke_BoundMethodHandle::argument(mh());
1494 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1495 KlassHandle bound_recv_type;
1496 if (receiver != NULL) bound_recv_type = KlassHandle(THREAD, receiver->klass());
1497 verify_method_type(m, mtype, true, bound_recv_type, CHECK);
1498
1499 int receiver_pos = m->size_of_parameters() - 1;
1500
1501 // Verify MH.vmargslot, which should point at the bound receiver.
1502 verify_vmargslot(mh, -1, java_lang_invoke_BoundMethodHandle::vmargslot(mh()), CHECK);
1503 //verify_vmslots(mh, CHECK);
1504
1505 // Verify vmslots.
1506 if (java_lang_invoke_MethodHandle::vmslots(mh()) != receiver_pos) {
1507 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)");
1508 }
1509 }
1510
1511 // Initialize a BMH with a receiver bound directly to a methodOop.
1512 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh,
1513 methodHandle original_m,
1514 KlassHandle receiver_limit,
1515 int decode_flags,
1516 TRAPS) {
1517 // Check arguments.
1518 if (mh.is_null() || original_m.is_null()) {
1519 THROW(vmSymbols::java_lang_InternalError());
1520 }
1521
1522 KlassHandle receiver_klass;
1523 {
1524 oop receiver_oop = java_lang_invoke_BoundMethodHandle::argument(mh());
1525 if (receiver_oop != NULL)
1526 receiver_klass = KlassHandle(THREAD, receiver_oop->klass());
1527 }
1528 methodHandle m = dispatch_decoded_method(original_m,
1529 receiver_limit, decode_flags,
1530 receiver_klass,
1531 CHECK);
1532 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); }
1533 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); }
1534
1535 java_lang_invoke_MethodHandle::init_vmslots(mh());
1536
1537 if (VerifyMethodHandles) {
1538 verify_BoundMethodHandle_with_receiver(mh, m, CHECK);
1539 }
1540
1541 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m());
1542
1543 DEBUG_ONLY(int junk; klassOop junk2);
1544 assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding");
1545 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot");
1546
1547 // Done!
1548 java_lang_invoke_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh));
1549 }
1550
1551 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
1552 bool direct_to_method, TRAPS) {
1553 Handle ptype_handle(THREAD,
1554 java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum));
1555 KlassHandle ptype_klass;
1556 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass);
1557 int slots_pushed = type2size[ptype];
1558
1559 oop argument = java_lang_invoke_BoundMethodHandle::argument(mh());
1560
1561 const char* err = NULL;
1562
1563 switch (ptype) {
1564 case T_OBJECT:
1565 if (argument != NULL)
1566 // we must implicitly convert from the arg type to the outgoing ptype
1567 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum);
1568 break;
1569
1570 case T_ARRAY: case T_VOID:
1571 assert(false, "array, void do not appear here");
1572 default:
1573 if (ptype != T_INT && !is_subword_type(ptype)) {
1574 err = "unexpected parameter type";
1575 break;
1576 }
1577 // check subrange of Integer.value, if necessary
1578 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) {
1579 err = "bound integer argument must be of type java.lang.Integer";
1580 break;
1581 }
1582 if (ptype != T_INT) {
1583 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
1584 jint value = argument->int_field(value_offset);
1585 int vminfo = adapter_unbox_subword_vminfo(ptype);
1586 jint subword = truncate_subword_from_vminfo(value, vminfo);
1587 if (value != subword) {
1588 err = "bound subword value does not fit into the subword type";
1589 break;
1590 }
1591 }
1592 break;
1593 case T_FLOAT:
1594 case T_DOUBLE:
1595 case T_LONG:
1596 {
1597 // we must implicitly convert from the unboxed arg type to the outgoing ptype
1598 BasicType argbox = java_lang_boxing_object::basic_type(argument);
1599 if (argbox != ptype) {
1600 err = check_argument_type_change(T_OBJECT, (argument == NULL
1601 ? SystemDictionary::Object_klass()
1602 : argument->klass()),
1603 ptype, ptype_klass(), argnum);
1604 assert(err != NULL, "this must be an error");
1605 }
1606 break;
1607 }
1608 }
1609
1610 if (err == NULL) {
1611 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1612 if (direct_to_method) {
1613 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots");
1614 assert(slots_pushed <= MethodHandlePushLimit, "");
1615 } else {
1616 int target_pushes = decode_MethodHandle_stack_pushes(target());
1617 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct");
1618 // do not blow the stack; use a Java-based adapter if this limit is exceeded
1619 // FIXME
1620 // if (slots_pushed + target_pushes > MethodHandlePushLimit)
1621 // err = "too many bound parameters";
1622 }
1623 }
1624
1625 if (err == NULL) {
1626 // Verify the rest of the method type.
1627 err = check_method_type_insertion(java_lang_invoke_MethodHandle::type(mh()),
1628 argnum, ptype_handle(),
1629 java_lang_invoke_MethodHandle::type(target()));
1630 }
1631
1632 if (err != NULL) {
1633 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1634 }
1635 }
1636
1637 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
1638 // Check arguments.
1639 if (mh.is_null() || target.is_null() || !java_lang_invoke_MethodHandle::is_instance(target())) {
1640 THROW(vmSymbols::java_lang_InternalError());
1641 }
1642
1643 java_lang_invoke_MethodHandle::init_vmslots(mh());
1644
1645 if (VerifyMethodHandles) {
1646 int insert_after = argnum - 1;
1647 verify_vmargslot(mh, insert_after, java_lang_invoke_BoundMethodHandle::vmargslot(mh()), CHECK);
1648 verify_vmslots(mh, CHECK);
1649 }
1650
1651 // Get bound type and required slots.
1652 oop ptype_oop = java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum);
1653 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop);
1654 int slots_pushed = type2size[ptype];
1655
1656 // If (a) the target is a direct non-dispatched method handle,
1657 // or (b) the target is a dispatched direct method handle and we
1658 // are binding the receiver, cut out the middle-man.
1659 // Do this by decoding the DMH and using its methodOop directly as vmtarget.
1660 bool direct_to_method = false;
1661 if (OptimizeMethodHandles &&
1662 target->klass() == SystemDictionary::DirectMethodHandle_klass() &&
1663 (argnum == 0 || java_lang_invoke_DirectMethodHandle::vmindex(target()) < 0)) {
1664 int decode_flags = 0; klassOop receiver_limit_oop = NULL;
1665 methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags));
1666 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); }
1667 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg.
1668 assert(java_lang_invoke_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig");
1669 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) {
1670 KlassHandle receiver_limit(THREAD, receiver_limit_oop);
1671 init_BoundMethodHandle_with_receiver(mh, m,
1672 receiver_limit, decode_flags,
1673 CHECK);
1674 return;
1675 }
1676
1677 // Even if it is not a bound receiver, we still might be able
1678 // to bind another argument and still invoke the methodOop directly.
1679 if (!(decode_flags & _dmf_does_dispatch)) {
1680 direct_to_method = true;
1681 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m());
1682 }
1683 }
1684 if (!direct_to_method)
1685 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), target());
1686
1687 if (VerifyMethodHandles) {
1688 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK);
1689 }
1690
1691 // Next question: Is this a ref, int, or long bound value?
1692 MethodHandleEntry* me = NULL;
1693 if (ptype == T_OBJECT) {
1694 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh);
1695 else me = MethodHandles::entry(_bound_ref_mh);
1696 } else if (slots_pushed == 2) {
1697 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh);
1698 else me = MethodHandles::entry(_bound_long_mh);
1699 } else if (slots_pushed == 1) {
1700 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh);
1701 else me = MethodHandles::entry(_bound_int_mh);
1702 } else {
1703 assert(false, "");
1704 }
1705
1706 // Done!
1707 java_lang_invoke_MethodHandle::set_vmentry(mh(), me);
1708 }
1709
1710 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) {
1711 char msg[200];
1712 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err);
1713 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg);
1714 }
1715
1716 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) {
1717 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
1718 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
1719
1720 verify_vmargslot(mh, argnum, argslot, CHECK);
1721 verify_vmslots(mh, CHECK);
1722
1723 jint conv_op = adapter_conversion_op(conversion);
1724 if (!conv_op_valid(conv_op)) {
1725 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD);
1726 return;
1727 }
1728 EntryKind ek = adapter_entry_kind(conv_op);
1729
1730 int stack_move = adapter_conversion_stack_move(conversion);
1731 BasicType src = adapter_conversion_src_type(conversion);
1732 BasicType dest = adapter_conversion_dest_type(conversion);
1733 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
1734
1735 Handle argument(THREAD, java_lang_invoke_AdapterMethodHandle::argument(mh()));
1736 Handle target(THREAD, java_lang_invoke_AdapterMethodHandle::vmtarget(mh()));
1737 Handle src_mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1738 Handle dst_mtype(THREAD, java_lang_invoke_MethodHandle::type(target()));
1739
1740 const char* err = NULL;
1741
1742 if (err == NULL) {
1743 // Check that the correct argument is supplied, but only if it is required.
1744 switch (ek) {
1745 case _adapter_check_cast: // target type of cast
1746 case _adapter_ref_to_prim: // wrapper type from which to unbox
1747 case _adapter_prim_to_ref: // wrapper type to box into
1748 case _adapter_collect_args: // array type to collect into
1749 case _adapter_spread_args: // array type to spread from
1750 if (!java_lang_Class::is_instance(argument())
1751 || java_lang_Class::is_primitive(argument()))
1752 { err = "adapter requires argument of type java.lang.Class"; break; }
1753 if (ek == _adapter_collect_args ||
1754 ek == _adapter_spread_args) {
1755 // Make sure it is a suitable collection type. (Array, for now.)
1756 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument()));
1757 if (!ak->oop_is_objArray()) {
1758 { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; }
1759 }
1760 }
1761 break;
1762 case _adapter_flyby:
1763 case _adapter_ricochet:
1764 if (!java_lang_invoke_MethodHandle::is_instance(argument()))
1765 { err = "MethodHandle adapter argument required"; break; }
1766 break;
1767 default:
1768 if (argument.not_null())
1769 { err = "adapter has spurious argument"; break; }
1770 break;
1771 }
1772 }
1773
1774 if (err == NULL) {
1775 // Check that the src/dest types are supplied if needed.
1776 switch (ek) {
1777 case _adapter_check_cast:
1778 if (src != T_OBJECT || dest != T_OBJECT) {
1779 err = "adapter requires object src/dest conversion subfields";
1780 }
1781 break;
1782 case _adapter_prim_to_prim:
1783 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) {
1784 err = "adapter requires primitive src/dest conversion subfields"; break;
1785 }
1786 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) ||
1787 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) {
1788 err = "adapter cannot convert beween floating and fixed-point"; break;
1789 }
1790 break;
1791 case _adapter_ref_to_prim:
1792 if (src != T_OBJECT || !is_java_primitive(dest)
1793 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) {
1794 err = "adapter requires primitive dest conversion subfield"; break;
1795 }
1796 break;
1797 case _adapter_prim_to_ref:
1798 if (!is_java_primitive(src) || dest != T_OBJECT
1799 || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) {
1800 err = "adapter requires primitive src conversion subfield"; break;
1801 }
1802 break;
1803 case _adapter_swap_args:
1804 case _adapter_rot_args:
1805 {
1806 if (!src || src != dest) {
1807 err = "adapter requires src/dest conversion subfields for swap"; break;
1808 }
1809 int swap_size = type2size[src];
1810 oop src_mtype = java_lang_invoke_AdapterMethodHandle::type(mh());
1811 oop dest_mtype = java_lang_invoke_AdapterMethodHandle::type(target());
1812 int slot_limit = java_lang_invoke_AdapterMethodHandle::vmslots(target());
1813 int src_slot = argslot;
1814 int dest_slot = vminfo;
1815 bool rotate_up = (src_slot > dest_slot); // upward rotation
1816 int src_arg = argnum;
1817 int dest_arg = argument_slot_to_argnum(dest_mtype, dest_slot);
1818 verify_vmargslot(mh, dest_arg, dest_slot, CHECK);
1819 if (!(dest_slot >= src_slot + swap_size) &&
1820 !(src_slot >= dest_slot + swap_size)) {
1821 err = "source, destination slots must be distinct";
1822 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) {
1823 err = "source of swap must be deeper in stack";
1824 } else if (ek == _adapter_swap_args) {
1825 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype, dest_arg),
1826 java_lang_invoke_MethodType::ptype(dest_mtype, src_arg),
1827 dest_arg);
1828 } else if (ek == _adapter_rot_args) {
1829 if (rotate_up) {
1830 assert((src_slot > dest_slot) && (src_arg < dest_arg), "");
1831 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot]
1832 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1]
1833 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) {
1834 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype, i),
1835 java_lang_invoke_MethodType::ptype(dest_mtype, i-1),
1836 i);
1837 }
1838 } else { // rotate down
1839 assert((src_slot < dest_slot) && (src_arg > dest_arg), "");
1840 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss]
1841 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg]
1842 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) {
1843 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype, i),
1844 java_lang_invoke_MethodType::ptype(dest_mtype, i+1),
1845 i);
1846 }
1847 }
1848 }
1849 if (err == NULL)
1850 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype, src_arg),
1851 java_lang_invoke_MethodType::ptype(dest_mtype, dest_arg),
1852 src_arg);
1853 }
1854 break;
1855 case _adapter_collect_args:
1856 case _adapter_spread_args:
1857 {
1858 BasicType coll_type = (ek == _adapter_collect_args) ? dest : src;
1859 BasicType elem_type = (ek == _adapter_collect_args) ? src : dest;
1860 if (coll_type != T_OBJECT || elem_type != T_OBJECT) {
1861 err = "adapter requires src/dest subfields"; break;
1862 // later:
1863 // - consider making coll be a primitive array
1864 // - consider making coll be a heterogeneous collection
1865 }
1866 }
1867 break;
1868 default:
1869 if (src != 0 || dest != 0) {
1870 err = "adapter has spurious src/dest conversion subfields"; break;
1871 }
1872 break;
1873 }
1874 }
1875
1876 if (err == NULL) {
1877 // Check the stack_move subfield.
1878 // It must always report the net change in stack size, positive or negative.
1879 int slots_pushed = stack_move / stack_move_unit();
1880 switch (ek) {
1881 case _adapter_prim_to_prim:
1882 case _adapter_ref_to_prim:
1883 case _adapter_prim_to_ref:
1884 if (slots_pushed != type2size[dest] - type2size[src]) {
1885 err = "wrong stack motion for primitive conversion";
1886 }
1887 break;
1888 case _adapter_dup_args:
1889 if (slots_pushed <= 0) {
1890 err = "adapter requires conversion subfield slots_pushed > 0";
1891 }
1892 break;
1893 case _adapter_drop_args:
1894 if (slots_pushed >= 0) {
1895 err = "adapter requires conversion subfield slots_pushed < 0";
1896 }
1897 break;
1898 case _adapter_collect_args:
1899 if (slots_pushed > 1) {
1900 err = "adapter requires conversion subfield slots_pushed <= 1";
1901 }
1902 break;
1903 case _adapter_spread_args:
1904 if (slots_pushed < -1) {
1905 err = "adapter requires conversion subfield slots_pushed >= -1";
1906 }
1907 break;
1908 default:
1909 if (stack_move != 0) {
1910 err = "adapter has spurious stack_move conversion subfield";
1911 }
1912 break;
1913 }
1914 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) {
1915 err = "stack_move conversion subfield must be multiple of stack_move_unit";
1916 }
1917 }
1918
1919 if (err == NULL) {
1920 // Make sure this adapter does not push too deeply.
1921 int slots_pushed = stack_move / stack_move_unit();
1922 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh());
1923 int target_vmslots = java_lang_invoke_MethodHandle::vmslots(target());
1924 if (slots_pushed != (target_vmslots - this_vmslots)) {
1925 err = "stack_move inconsistent with previous and current MethodType vmslots";
1926 } else if (slots_pushed > 0) {
1927 // verify stack_move against MethodHandlePushLimit
1928 int target_pushes = decode_MethodHandle_stack_pushes(target());
1929 // do not blow the stack; use a Java-based adapter if this limit is exceeded
1930 if (slots_pushed + target_pushes > MethodHandlePushLimit) {
1931 err = "adapter pushes too many parameters";
1932 }
1933 }
1934
1935 // While we're at it, check that the stack motion decoder works:
1936 DEBUG_ONLY(int target_pushes = decode_MethodHandle_stack_pushes(target()));
1937 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1938 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct");
1939 }
1940
1941 if (err == NULL && vminfo != 0) {
1942 switch (ek) {
1943 case _adapter_swap_args:
1944 case _adapter_rot_args:
1945 break; // OK
1946 default:
1947 err = "vminfo subfield is reserved to the JVM";
1948 }
1949 }
1950
1951 // Do additional ad hoc checks.
1952 if (err == NULL) {
1953 switch (ek) {
1954 case _adapter_retype_only:
1955 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false);
1956 break;
1957
1958 case _adapter_retype_raw:
1959 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true);
1960 break;
1961
1962 case _adapter_check_cast:
1963 {
1964 // The actual value being checked must be a reference:
1965 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), argnum),
1966 object_java_mirror(), argnum);
1967 if (err != NULL) break;
1968
1969 // The output of the cast must fit with the destination argument:
1970 Handle cast_class = argument;
1971 err = check_method_type_conversion(src_mtype(),
1972 argnum, cast_class(),
1973 dst_mtype());
1974 }
1975 break;
1976
1977 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles
1978 }
1979 }
1980
1981 if (err != NULL) {
1982 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
1983 return;
1984 }
1985
1986 }
1987
1988 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
1989 oop argument = java_lang_invoke_AdapterMethodHandle::argument(mh());
1990 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
1991 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
1992 jint conv_op = adapter_conversion_op(conversion);
1993
1994 // adjust the adapter code to the internal EntryKind enumeration:
1995 EntryKind ek_orig = adapter_entry_kind(conv_op);
1996 EntryKind ek_opt = ek_orig; // may be optimized
1997
1998 // Finalize the vmtarget field (Java initialized it to null).
1999 if (!java_lang_invoke_MethodHandle::is_instance(target())) {
2000 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD);
2001 return;
2002 }
2003 java_lang_invoke_AdapterMethodHandle::set_vmtarget(mh(), target());
2004
2005 if (VerifyMethodHandles) {
2006 verify_AdapterMethodHandle(mh, argnum, CHECK);
2007 }
2008
2009 int stack_move = adapter_conversion_stack_move(conversion);
2010 BasicType src = adapter_conversion_src_type(conversion);
2011 BasicType dest = adapter_conversion_dest_type(conversion);
2012 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
2013
2014 const char* err = NULL;
2015
2016 // Now it's time to finish the case analysis and pick a MethodHandleEntry.
2017 switch (ek_orig) {
2018 case _adapter_retype_only:
2019 case _adapter_retype_raw:
2020 case _adapter_check_cast:
2021 case _adapter_dup_args:
2022 case _adapter_drop_args:
2023 // these work fine via general case code
2024 break;
2025
2026 case _adapter_prim_to_prim:
2027 {
2028 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}.
2029 // And, the {float,double} -> {int,long} cases must be handled by Java.
2030 switch (type2size[src] *4+ type2size[dest]) {
2031 case 1 *4+ 1:
2032 assert(src == T_INT || is_subword_type(src), "source is not float");
2033 // Subword-related cases are int -> {boolean,byte,char,short}.
2034 ek_opt = _adapter_opt_i2i;
2035 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2036 break;
2037 case 2 *4+ 1:
2038 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) {
2039 ek_opt = _adapter_opt_l2i;
2040 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2041 } else if (src == T_DOUBLE && dest == T_FLOAT) {
2042 ek_opt = _adapter_opt_d2f;
2043 } else {
2044 assert(false, "");
2045 }
2046 break;
2047 case 1 *4+ 2:
2048 if (src == T_INT && dest == T_LONG) {
2049 ek_opt = _adapter_opt_i2l;
2050 } else if (src == T_FLOAT && dest == T_DOUBLE) {
2051 ek_opt = _adapter_opt_f2d;
2052 } else {
2053 assert(false, "");
2054 }
2055 break;
2056 default:
2057 assert(false, "");
2058 break;
2059 }
2060 }
2061 break;
2062
2063 case _adapter_ref_to_prim:
2064 {
2065 switch (type2size[dest]) {
2066 case 1:
2067 ek_opt = _adapter_opt_unboxi;
2068 vminfo = adapter_unbox_subword_vminfo(dest);
2069 break;
2070 case 2:
2071 ek_opt = _adapter_opt_unboxl;
2072 break;
2073 default:
2074 assert(false, "");
2075 break;
2076 }
2077 }
2078 break;
2079
2080 case _adapter_prim_to_ref:
2081 goto throw_not_impl; // allocates, hence could block
2082
2083 case _adapter_swap_args:
2084 case _adapter_rot_args:
2085 {
2086 int swap_slots = type2size[src];
2087 int slot_limit = java_lang_invoke_AdapterMethodHandle::vmslots(mh());
2088 int src_slot = argslot;
2089 int dest_slot = vminfo;
2090 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1;
2091 switch (swap_slots) {
2092 case 1:
2093 ek_opt = (!rotate ? _adapter_opt_swap_1 :
2094 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down);
2095 break;
2096 case 2:
2097 ek_opt = (!rotate ? _adapter_opt_swap_2 :
2098 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down);
2099 break;
2100 default:
2101 assert(false, "");
2102 break;
2103 }
2104 }
2105 break;
2106
2107 case _adapter_collect_args:
2108 goto throw_not_impl; // allocates, hence could block
2109
2110 case _adapter_spread_args:
2111 {
2112 // vminfo will be the required length of the array
2113 int slots_pushed = stack_move / stack_move_unit();
2114 int array_size = slots_pushed + 1;
2115 assert(array_size >= 0, "");
2116 vminfo = array_size;
2117 switch (array_size) {
2118 case 0: ek_opt = _adapter_opt_spread_0; break;
2119 case 1: ek_opt = _adapter_opt_spread_1; break;
2120 default: ek_opt = _adapter_opt_spread_more; break;
2121 }
2122 if ((vminfo & CONV_VMINFO_MASK) != vminfo)
2123 goto throw_not_impl; // overflow
2124 }
2125 break;
2126
2127 case _adapter_flyby:
2128 case _adapter_ricochet:
2129 goto throw_not_impl; // runs Java code, hence could block
2130
2131 default:
2132 // should have failed much earlier; must be a missing case here
2133 assert(false, "incomplete switch");
2134 // and fall through:
2135
2136 throw_not_impl:
2137 // FIXME: these adapters are NYI
2138 err = "adapter not yet implemented in the JVM";
2139 break;
2140 }
2141
2142 if (err != NULL) {
2143 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
2144 return;
2145 }
2146
2147 // Rebuild the conversion value; maybe parts of it were changed.
2148 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo);
2149
2150 // Finalize the conversion field. (Note that it is final to Java code.)
2151 java_lang_invoke_AdapterMethodHandle::set_conversion(mh(), new_conversion);
2152
2153 // Done!
2154 java_lang_invoke_MethodHandle::set_vmentry(mh(), entry(ek_opt));
2155
2156 // There should be enough memory barriers on exit from native methods
2157 // to ensure that the MH is fully initialized to all threads before
2158 // Java code can publish it in global data structures.
2159 }
2160
2161 //
2162 // Here are the native methods on sun.invoke.MethodHandleImpl.
2163 // They are the private interface between this JVM and the HotSpot-specific
2164 // Java code that implements JSR 292 method handles.
2165 //
2166 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
2167 // that intrinsic (non-JNI) native methods are defined in HotSpot.
2168 //
2169
2170 // direct method handles for invokestatic or invokespecial
2171 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller);
2172 JVM_ENTRY(void, MHN_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2173 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) {
2174 ResourceMark rm; // for error messages
2175
2176 // This is the guy we are initializing:
2177 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2178 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2179
2180 // Early returns out of this method leave the DMH in an unfinished state.
2181 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2182
2183 // which method are we really talking about?
2184 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2185 oop target_oop = JNIHandles::resolve_non_null(target_jh);
2186 if (java_lang_invoke_MemberName::is_instance(target_oop) &&
2187 java_lang_invoke_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) {
2188 Handle mname(THREAD, target_oop);
2189 MethodHandles::resolve_MemberName(mname, CHECK);
2190 target_oop = mname(); // in case of GC
2191 }
2192
2193 int decode_flags = 0; klassOop receiver_limit = NULL;
2194 methodHandle m(THREAD,
2195 MethodHandles::decode_method(target_oop,
2196 receiver_limit, decode_flags));
2197 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); }
2198
2199 // The trusted Java code that calls this method should already have performed
2200 // access checks on behalf of the given caller. But, we can verify this.
2201 if (VerifyMethodHandles && caller_jh != NULL) {
2202 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)));
2203 // If this were a bytecode, the first access check would be against
2204 // the "reference class" mentioned in the CONSTANT_Methodref.
2205 // We don't know at this point which class that was, and if we
2206 // check against m.method_holder we might get the wrong answer.
2207 // So we just make sure to handle this check when the resolution
2208 // happens, when we call resolve_MemberName.
2209 //
2210 // (A public class can inherit public members from private supers,
2211 // and it would be wrong to check access against the private super
2212 // if the original symbolic reference was against the public class.)
2213 //
2214 // If there were a bytecode, the next step would be to lookup the method
2215 // in the reference class, then then check the method's access bits.
2216 // Emulate LinkResolver::check_method_accessability.
2217 klassOop resolved_klass = m->method_holder();
2218 if (!Reflection::verify_field_access(caller->as_klassOop(),
2219 resolved_klass, resolved_klass,
2220 m->access_flags(),
2221 true)) {
2222 // %%% following cutout belongs in Reflection::verify_field_access?
2223 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(),
2224 resolved_klass, THREAD);
2225 if (!same_pm) {
2226 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string());
2227 }
2228 }
2229 }
2230
2231 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK);
2232 }
2233 JVM_END
2234
2235 // bound method handles
2236 JVM_ENTRY(void, MHN_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2237 jobject target_jh, int argnum)) {
2238 ResourceMark rm; // for error messages
2239
2240 // This is the guy we are initializing:
2241 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2242 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2243
2244 // Early returns out of this method leave the BMH in an unfinished state.
2245 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2246
2247 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2248 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2249
2250 if (!java_lang_invoke_MethodHandle::is_instance(target())) {
2251 // Target object is a reflective method. (%%% Do we need this alternate path?)
2252 Untested("init_BMH of non-MH");
2253 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); }
2254 int decode_flags = 0; klassOop receiver_limit_oop = NULL;
2255 methodHandle m(THREAD,
2256 MethodHandles::decode_method(target(),
2257 receiver_limit_oop,
2258 decode_flags));
2259 KlassHandle receiver_limit(THREAD, receiver_limit_oop);
2260 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m,
2261 receiver_limit,
2262 decode_flags,
2263 CHECK);
2264 return;
2265 }
2266
2267 // Build a BMH on top of a DMH or another BMH:
2268 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK);
2269 }
2270 JVM_END
2271
2272 // adapter method handles
2273 JVM_ENTRY(void, MHN_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2274 jobject target_jh, int argnum)) {
2275 // This is the guy we are initializing:
2276 if (mh_jh == NULL || target_jh == NULL) {
2277 THROW(vmSymbols::java_lang_InternalError());
2278 }
2279 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2280 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2281
2282 // Early returns out of this method leave the AMH in an unfinished state.
2283 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2284
2285 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK);
2286 }
2287 JVM_END
2288
2289 // method type forms
2290 JVM_ENTRY(void, MHN_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) {
2291 if (erased_jh == NULL) return;
2292 if (TraceMethodHandles) {
2293 tty->print("creating MethodType form ");
2294 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH!
2295 // call Object.toString()
2296 Symbol* name = vmSymbols::toString_name();
2297 Symbol* sig = vmSymbols::void_string_signature();
2298 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh)));
2299 JavaValue result(T_OBJECT);
2300 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig,
2301 &args, CHECK);
2302 Handle str(THREAD, (oop)result.get_jobject());
2303 java_lang_String::print(str, tty);
2304 }
2305 tty->cr();
2306 }
2307 }
2308 JVM_END
2309
2310 // debugging and reflection
2311 JVM_ENTRY(jobject, MHN_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) {
2312 Handle mh(THREAD, JNIHandles::resolve(mh_jh));
2313 if (!java_lang_invoke_MethodHandle::is_instance(mh())) {
2314 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
2315 }
2316 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL);
2317 return JNIHandles::make_local(THREAD, target);
2318 }
2319 JVM_END
2320
2321 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
2322 switch (which) {
2323 case MethodHandles::GC_JVM_PUSH_LIMIT:
2324 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF,
2325 "MethodHandlePushLimit parameter must be in valid range");
2326 return MethodHandlePushLimit;
2327 case MethodHandles::GC_JVM_STACK_MOVE_UNIT:
2328 // return number of words per slot, signed according to stack direction
2329 return MethodHandles::stack_move_unit();
2330 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK:
2331 return MethodHandles::adapter_conversion_ops_supported_mask();
2332 }
2333 return 0;
2334 }
2335 JVM_END
2336
2337 #ifndef PRODUCT
2338 #define EACH_NAMED_CON(template) \
2339 template(MethodHandles,GC_JVM_PUSH_LIMIT) \
2340 template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) \
2341 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \
2342 template(MethodHandles,ETF_DIRECT_HANDLE) \
2343 template(MethodHandles,ETF_METHOD_NAME) \
2344 template(MethodHandles,ETF_REFLECT_METHOD) \
2345 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
2346 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
2347 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
2348 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
2349 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
2350 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
2351 template(java_lang_invoke_MemberName,VM_INDEX_UNINITIALIZED) \
2352 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_ONLY) \
2353 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_RAW) \
2354 template(java_lang_invoke_AdapterMethodHandle,OP_CHECK_CAST) \
2355 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_PRIM) \
2356 template(java_lang_invoke_AdapterMethodHandle,OP_REF_TO_PRIM) \
2357 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_REF) \
2358 template(java_lang_invoke_AdapterMethodHandle,OP_SWAP_ARGS) \
2359 template(java_lang_invoke_AdapterMethodHandle,OP_ROT_ARGS) \
2360 template(java_lang_invoke_AdapterMethodHandle,OP_DUP_ARGS) \
2361 template(java_lang_invoke_AdapterMethodHandle,OP_DROP_ARGS) \
2362 template(java_lang_invoke_AdapterMethodHandle,OP_COLLECT_ARGS) \
2363 template(java_lang_invoke_AdapterMethodHandle,OP_SPREAD_ARGS) \
2364 template(java_lang_invoke_AdapterMethodHandle,OP_FLYBY) \
2365 template(java_lang_invoke_AdapterMethodHandle,OP_RICOCHET) \
2366 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_LIMIT) \
2367 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_MASK) \
2368 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_MASK) \
2369 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_SHIFT) \
2370 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_SHIFT) \
2371 template(java_lang_invoke_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \
2372 template(java_lang_invoke_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \
2373 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \
2374 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \
2375 /*end*/
2376
2377 #define ONE_PLUS(scope,value) 1+
2378 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0;
2379 #define VALUE_COMMA(scope,value) scope::value,
2380 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 };
2381 #define STRING_NULL(scope,value) #value "\0"
2382 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) };
2383
2384 #undef ONE_PLUS
2385 #undef VALUE_COMMA
2386 #undef STRING_NULL
2387 #undef EACH_NAMED_CON
2388 #endif
2389
2390 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
2391 #ifndef PRODUCT
2392 if (which >= 0 && which < con_value_count) {
2393 int con = con_values[which];
2394 objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh);
2395 if (box != NULL && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
2396 const char* str = &con_names[0];
2397 for (int i = 0; i < which; i++)
2398 str += strlen(str) + 1; // skip name and null
2399 oop name = java_lang_String::create_oop_from_str(str, CHECK_0);
2400 box->obj_at_put(0, name);
2401 }
2402 return con;
2403 }
2404 #endif
2405 return 0;
2406 }
2407 JVM_END
2408
2409 // void init(MemberName self, AccessibleObject ref)
2410 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
2411 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2412 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2413 oop target_oop = JNIHandles::resolve_non_null(target_jh);
2414 MethodHandles::init_MemberName(mname(), target_oop);
2415 }
2416 JVM_END
2417
2418 // void expand(MemberName self)
2419 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
2420 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2421 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2422 MethodHandles::expand_MemberName(mname, 0, CHECK);
2423 }
2424 JVM_END
2425
2426 // void resolve(MemberName self, Class<?> caller)
2427 JVM_ENTRY(void, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
2428 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2429 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2430
2431 // The trusted Java code that calls this method should already have performed
2432 // access checks on behalf of the given caller. But, we can verify this.
2433 if (VerifyMethodHandles && caller_jh != NULL) {
2434 klassOop reference_klass = java_lang_Class::as_klassOop(java_lang_invoke_MemberName::clazz(mname()));
2435 if (reference_klass != NULL) {
2436 // Emulate LinkResolver::check_klass_accessability.
2437 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh));
2438 if (!Reflection::verify_class_access(caller,
2439 reference_klass,
2440 true)) {
2441 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name());
2442 }
2443 }
2444 }
2445
2446 MethodHandles::resolve_MemberName(mname, CHECK);
2447 }
2448 JVM_END
2449
2450 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
2451 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
2452 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
2453 jclass clazz_jh, jstring name_jh, jstring sig_jh,
2454 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
2455 if (clazz_jh == NULL || results_jh == NULL) return -1;
2456 klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh));
2457
2458 objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh);
2459 if (results == NULL || !results->is_objArray()) return -1;
2460
2461 TempNewSymbol name = NULL;
2462 TempNewSymbol sig = NULL;
2463 if (name_jh != NULL) {
2464 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
2465 if (name == NULL) return 0; // a match is not possible
2466 }
2467 if (sig_jh != NULL) {
2468 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
2469 if (sig == NULL) return 0; // a match is not possible
2470 }
2471
2472 klassOop caller = NULL;
2473 if (caller_jh != NULL) {
2474 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
2475 if (!java_lang_Class::is_instance(caller_oop)) return -1;
2476 caller = java_lang_Class::as_klassOop(caller_oop);
2477 }
2478
2479 if (name != NULL && sig != NULL && results != NULL) {
2480 // try a direct resolve
2481 // %%% TO DO
2482 }
2483
2484 int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags,
2485 caller, skip, results);
2486 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
2487 return res;
2488 }
2489 JVM_END
2490
2491 JVM_ENTRY(void, MHN_registerBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh, jobject bsm_jh)) {
2492 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD);
2493 if (!AllowTransitionalJSR292) {
2494 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2495 "registerBootstrapMethod is only supported in JSR 292 EDR");
2496 }
2497 ik->link_class(CHECK);
2498 if (!java_lang_invoke_MethodHandle::is_instance(JNIHandles::resolve(bsm_jh))) {
2499 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "method handle");
2500 }
2501 const char* err = NULL;
2502 if (ik->is_initialized() || ik->is_in_error_state()) {
2503 err = "too late: class is already initialized";
2504 } else {
2505 ObjectLocker ol(ik, THREAD); // note: this should be a recursive lock
2506 if (ik->is_not_initialized() ||
2507 (ik->is_being_initialized() && ik->is_reentrant_initialization(THREAD))) {
2508 if (ik->bootstrap_method() != NULL) {
2509 err = "class is already equipped with a bootstrap method";
2510 } else {
2511 ik->set_bootstrap_method(JNIHandles::resolve_non_null(bsm_jh));
2512 err = NULL;
2513 }
2514 } else {
2515 err = "class is already initialized";
2516 if (ik->is_being_initialized())
2517 err = "class is already being initialized in a different thread";
2518 }
2519 }
2520 if (err != NULL) {
2521 THROW_MSG(vmSymbols::java_lang_IllegalStateException(), err);
2522 }
2523 }
2524 JVM_END
2525
2526 JVM_ENTRY(jobject, MHN_getBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh)) {
2527 if (!AllowTransitionalJSR292)
2528 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "getBootstrap: transitional only");
2529 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD);
2530 return JNIHandles::make_local(THREAD, ik->bootstrap_method());
2531 }
2532 JVM_END
2533
2534 JVM_ENTRY(void, MHN_setCallSiteTarget(JNIEnv *env, jobject igcls, jobject site_jh, jobject target_jh)) {
2535 if (!AllowTransitionalJSR292)
2536 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "setCallSite: transitional only");
2537 }
2538 JVM_END
2539
2540
2541 /// JVM_RegisterMethodHandleMethods
2542
2543 #define LANG "Ljava/lang/"
2544 #define JLINV "Ljava/lang/invoke/" /* standard package */
2545 #define JDYN "Ljava/dyn/" /* alternative package to JLINV if AllowTransitionalJSR292 */
2546 #define IDYN "Lsun/dyn/" /* alternative package to JDYN if AllowTransitionalJSR292 */
2547 // FIXME: After AllowTransitionalJSR292 is removed, replace JDYN and IDYN by JLINV.
2548
2549 #define OBJ LANG"Object;"
2550 #define CLS LANG"Class;"
2551 #define STRG LANG"String;"
2552 #define CST JDYN"CallSite;"
2553 #define MT JDYN"MethodType;"
2554 #define MH JDYN"MethodHandle;"
2555 #define MEM IDYN"MemberName;"
2556 #define AMH IDYN"AdapterMethodHandle;"
2557 #define BMH IDYN"BoundMethodHandle;"
2558 #define DMH IDYN"DirectMethodHandle;"
2559
2560 #define CC (char*) /*cast a literal from (const char*)*/
2561 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
2562
2563 // These are the native methods on sun.invoke.MethodHandleNatives.
2564 static JNINativeMethod methods[] = {
2565 // void init(MemberName self, AccessibleObject ref)
2566 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHN_init_AMH)},
2567 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHN_init_BMH)},
2568 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHN_init_DMH)},
2569 {CC"init", CC"("MT")V", FN_PTR(MHN_init_MT)},
2570 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
2571 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
2572 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHN_resolve_Mem)},
2573 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHN_getTarget)},
2574 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
2575 // static native int getNamedCon(int which, Object[] name)
2576 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
2577 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
2578 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
2579 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}
2580 };
2581
2582 // FIXME: Remove methods2 after AllowTransitionalJSR292 is removed.
2583 static JNINativeMethod methods2[] = {
2584 {CC"registerBootstrap", CC"("CLS MH")V", FN_PTR(MHN_registerBootstrap)},
2585 {CC"getBootstrap", CC"("CLS")"MH, FN_PTR(MHN_getBootstrap)},
2586 {CC"setCallSiteTarget", CC"("CST MH")V", FN_PTR(MHN_setCallSiteTarget)}
2587 };
2588
2589 static void hack_signatures(JNINativeMethod* methods, jint num_methods, const char* from_sig, const char* to_sig) {
2590 for (int i = 0; i < num_methods; i++) {
2591 const char* sig = methods[i].signature;
2592 if (!strstr(sig, from_sig)) continue;
2593 size_t buflen = strlen(sig) + 100;
2594 char* buf = NEW_C_HEAP_ARRAY(char, buflen);
2595 char* bufp = buf;
2596 const char* sigp = sig;
2597 size_t from_len = strlen(from_sig), to_len = strlen(to_sig);
2598 while (*sigp != '\0') {
2599 assert(bufp < buf + buflen - to_len - 1, "oob");
2600 if (strncmp(sigp, from_sig, from_len) != 0) {
2601 *bufp++ = *sigp++;
2602 } else {
2603 strcpy(bufp, to_sig);
2604 bufp += to_len;
2605 sigp += from_len;
2606 }
2607 }
2608 *bufp = '\0';
2609 methods[i].signature = buf; // replace with new signature
2610 if (TraceMethodHandles)
2611 tty->print_cr("MethodHandleNatives: %s: change signature %s => %s", methods[i].name, sig, buf);
2612 }
2613 }
2614
2615 // This one function is exported, used by NativeLookup.
2616
2617 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
2618 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK");
2619
2620 if (!EnableInvokeDynamic) {
2621 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
2622 return; // bind nothing
2623 }
2624
2625 if (SystemDictionary::MethodHandleNatives_klass() != NULL &&
2626 SystemDictionary::MethodHandleNatives_klass() != java_lang_Class::as_klassOop(JNIHandles::resolve(MHN_class))) {
2627 warning("multiple versions of MethodHandleNatives in boot classpath; consider using -XX:+PreferTransitionalJSR292");
2628 THROW_MSG(vmSymbols::java_lang_InternalError(), "multiple versions of MethodHandleNatives in boot classpath; consider using -XX:+PreferTransitionalJSR292");
2629 }
2630
2631 bool enable_MH = true;
2632
2633 // Loop control. FIXME: Replace by dead reckoning after AllowTransitionalJSR292 is removed.
2634 bool registered_natives = false;
2635 bool try_plain = true, try_JDYN = true, try_IDYN = true;
2636 for (;;) {
2637 ThreadToNativeFromVM ttnfv(thread);
2638
2639 if (try_plain) { try_plain = false; }
2640 else if (try_JDYN) { try_JDYN = false; hack_signatures(methods, sizeof(methods)/sizeof(JNINativeMethod), IDYN, JDYN); }
2641 else if (try_IDYN) { try_IDYN = false; hack_signatures(methods, sizeof(methods)/sizeof(JNINativeMethod), JDYN, JLINV); }
2642 else { break; }
2643 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod));
2644 if (env->ExceptionOccurred()) {
2645 env->ExceptionClear();
2646 // and try again...
2647 } else {
2648 registered_natives = true;
2649 break;
2650 }
2651 }
2652 if (!registered_natives) {
2653 MethodHandles::set_enabled(false);
2654 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
2655 enable_MH = false;
2656 }
2657
2658 if (enable_MH) {
2659 bool found_raise_exception = false;
2660 KlassHandle MHN_klass = SystemDictionaryHandles::MethodHandleNatives_klass();
2661 KlassHandle MHI_klass = SystemDictionaryHandles::MethodHandleImpl_klass();
2662 // Loop control. FIXME: Replace by dead reckoning after AllowTransitionalJSR292 is removed.
2663 bool try_MHN = true, try_MHI = AllowTransitionalJSR292;
2664 for (;;) {
2665 KlassHandle try_klass;
2666 if (try_MHN) { try_MHN = false; try_klass = MHN_klass; }
2667 else if (try_MHI) { try_MHI = false; try_klass = MHI_klass; }
2668 else { break; }
2669 if (try_klass.is_null()) continue;
2670 TempNewSymbol raiseException_name = SymbolTable::new_symbol("raiseException", CHECK);
2671 TempNewSymbol raiseException_sig = SymbolTable::new_symbol("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK);
2672 methodOop raiseException_method = instanceKlass::cast(try_klass->as_klassOop())
2673 ->find_method(raiseException_name, raiseException_sig);
2674 if (raiseException_method != NULL && raiseException_method->is_static()) {
2675 MethodHandles::set_raise_exception_method(raiseException_method);
2676 found_raise_exception = true;
2677 break;
2678 }
2679 }
2680 if (!found_raise_exception) {
2681 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
2682 enable_MH = false;
2683 }
2684 }
2685
2686 if (enable_MH) {
2687 if (AllowTransitionalJSR292) {
2688 // We need to link the MethodHandleImpl klass before we generate
2689 // the method handle adapters as the _raise_exception adapter uses
2690 // one of its methods (and its c2i-adapter).
2691 klassOop k = SystemDictionary::MethodHandleImpl_klass();
2692 if (k != NULL) {
2693 instanceKlass* ik = instanceKlass::cast(k);
2694 ik->link_class(CHECK);
2695 }
2696 }
2697
2698 MethodHandles::generate_adapters();
2699 MethodHandles::set_enabled(true);
2700 }
2701
2702 if (AllowTransitionalJSR292) {
2703 ThreadToNativeFromVM ttnfv(thread);
2704
2705 int status = env->RegisterNatives(MHN_class, methods2, sizeof(methods2)/sizeof(JNINativeMethod));
2706 if (env->ExceptionOccurred()) {
2707 // Don't do this, since it's too late:
2708 // MethodHandles::set_enabled(false)
2709 env->ExceptionClear();
2710 }
2711 }
2712 }
2713 JVM_END