Thu, 27 May 2010 19:08:38 -0700
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
1 /*
2 * Copyright (c) 2008, 2010, 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 */
25 /*
26 * JSR 292 reference implementation: method handles
27 */
29 #include "incls/_precompiled.incl"
30 #include "incls/_methodHandles.cpp.incl"
32 bool MethodHandles::_enabled = false; // set true after successful native linkage
34 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL};
35 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = {
36 "raise_exception",
37 "invokestatic", // how a MH emulates invokestatic
38 "invokespecial", // ditto for the other invokes...
39 "invokevirtual",
40 "invokeinterface",
41 "bound_ref", // these are for BMH...
42 "bound_int",
43 "bound_long",
44 "bound_ref_direct", // (direct versions have a direct methodOop)
45 "bound_int_direct",
46 "bound_long_direct",
48 // starting at _adapter_mh_first:
49 "adapter_retype_only", // these are for AMH...
50 "adapter_retype_raw",
51 "adapter_check_cast",
52 "adapter_prim_to_prim",
53 "adapter_ref_to_prim",
54 "adapter_prim_to_ref",
55 "adapter_swap_args",
56 "adapter_rot_args",
57 "adapter_dup_args",
58 "adapter_drop_args",
59 "adapter_collect_args",
60 "adapter_spread_args",
61 "adapter_flyby",
62 "adapter_ricochet",
64 // optimized adapter types:
65 "adapter_swap_args/1",
66 "adapter_swap_args/2",
67 "adapter_rot_args/1,up",
68 "adapter_rot_args/1,down",
69 "adapter_rot_args/2,up",
70 "adapter_rot_args/2,down",
71 "adapter_prim_to_prim/i2i",
72 "adapter_prim_to_prim/l2i",
73 "adapter_prim_to_prim/d2f",
74 "adapter_prim_to_prim/i2l",
75 "adapter_prim_to_prim/f2d",
76 "adapter_ref_to_prim/unboxi",
77 "adapter_ref_to_prim/unboxl",
78 "adapter_spread_args/0",
79 "adapter_spread_args/1",
80 "adapter_spread_args/more",
82 NULL
83 };
85 // Adapters.
86 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
87 int MethodHandles::_adapter_code_size = StubRoutines::method_handles_adapters_code_size;
89 jobject MethodHandles::_raise_exception_method;
91 #ifdef ASSERT
92 bool MethodHandles::spot_check_entry_names() {
93 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), "");
94 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), "");
95 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), "");
96 assert(!strcmp(entry_name(_adapter_ricochet), "adapter_ricochet"), "");
97 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), "");
98 return true;
99 }
100 #endif
103 //------------------------------------------------------------------------------
104 // MethodHandles::generate_adapters
105 //
106 void MethodHandles::generate_adapters() {
107 if (!EnableMethodHandles || SystemDictionary::MethodHandle_klass() == NULL) return;
109 assert(_adapter_code == NULL, "generate only once");
111 ResourceMark rm;
112 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
113 _adapter_code = MethodHandlesAdapterBlob::create(_adapter_code_size);
114 if (_adapter_code == NULL)
115 vm_exit_out_of_memory(_adapter_code_size, "CodeCache: no room for MethodHandles adapters");
116 CodeBuffer code(_adapter_code->instructions_begin(), _adapter_code->instructions_size());
118 MethodHandlesAdapterGenerator g(&code);
119 g.generate();
120 }
123 //------------------------------------------------------------------------------
124 // MethodHandlesAdapterGenerator::generate
125 //
126 void MethodHandlesAdapterGenerator::generate() {
127 // Generate generic method handle adapters.
128 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST;
129 ek < MethodHandles::_EK_LIMIT;
130 ek = MethodHandles::EntryKind(1 + (int)ek)) {
131 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek));
132 MethodHandles::generate_method_handle_stub(_masm, ek);
133 }
134 }
137 void MethodHandles::set_enabled(bool z) {
138 if (_enabled != z) {
139 guarantee(z && EnableMethodHandles, "can only enable once, and only if -XX:+EnableMethodHandles");
140 _enabled = z;
141 }
142 }
144 // Note: A method which does not have a TRAPS argument cannot block in the GC
145 // or throw exceptions. Such methods are used in this file to do something quick
146 // and local, like parse a data structure. For speed, such methods work on plain
147 // oops, not handles. Trapping methods uniformly operate on handles.
149 methodOop MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype,
150 klassOop& receiver_limit_result, int& decode_flags_result) {
151 if (vmtarget == NULL) return NULL;
152 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding");
153 if (vmindex < 0) {
154 // this DMH performs no dispatch; it is directly bound to a methodOop
155 // A MemberName may either be directly bound to a methodOop,
156 // or it may use the klass/index form; both forms mean the same thing.
157 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result);
158 if ((decode_flags_result & _dmf_has_receiver) != 0
159 && java_dyn_MethodType::is_instance(mtype)) {
160 // Extract receiver type restriction from mtype.ptypes[0].
161 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype);
162 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0);
163 if (java_lang_Class::is_instance(ptype0))
164 receiver_limit_result = java_lang_Class::as_klassOop(ptype0);
165 }
166 if (vmindex == methodOopDesc::nonvirtual_vtable_index) {
167 // this DMH can be an "invokespecial" version
168 decode_flags_result &= ~_dmf_does_dispatch;
169 } else {
170 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?");
171 }
172 return m;
173 } else {
174 assert(vmtarget->is_klass(), "must be class or interface");
175 decode_flags_result |= MethodHandles::_dmf_does_dispatch;
176 decode_flags_result |= MethodHandles::_dmf_has_receiver;
177 receiver_limit_result = (klassOop)vmtarget;
178 Klass* tk = Klass::cast((klassOop)vmtarget);
179 if (tk->is_interface()) {
180 // an itable linkage is <interface, itable index>
181 decode_flags_result |= MethodHandles::_dmf_from_interface;
182 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex);
183 } else {
184 if (!tk->oop_is_instance())
185 tk = instanceKlass::cast(SystemDictionary::Object_klass());
186 return ((instanceKlass*)tk)->method_at_vtable(vmindex);
187 }
188 }
189 }
191 // MemberName and DirectMethodHandle have the same linkage to the JVM internals.
192 // (MemberName is the non-operational name used for queries and setup.)
194 methodOop MethodHandles::decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
195 oop vmtarget = sun_dyn_DirectMethodHandle::vmtarget(mh);
196 int vmindex = sun_dyn_DirectMethodHandle::vmindex(mh);
197 oop mtype = sun_dyn_DirectMethodHandle::type(mh);
198 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result);
199 }
201 methodOop MethodHandles::decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
202 assert(sun_dyn_BoundMethodHandle::is_instance(mh), "");
203 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), "");
204 for (oop bmh = mh;;) {
205 // Bound MHs can be stacked to bind several arguments.
206 oop target = java_dyn_MethodHandle::vmtarget(bmh);
207 if (target == NULL) return NULL;
208 decode_flags_result |= MethodHandles::_dmf_binds_argument;
209 klassOop tk = target->klass();
210 if (tk == SystemDictionary::BoundMethodHandle_klass()) {
211 bmh = target;
212 continue;
213 } else {
214 if (java_dyn_MethodHandle::is_subclass(tk)) {
215 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH");
216 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
217 } else {
218 // Optimized case: binding a receiver to a non-dispatched DMH
219 // short-circuits directly to the methodOop.
220 // (It might be another argument besides a receiver also.)
221 assert(target->is_method(), "must be a simple method");
222 decode_flags_result |= MethodHandles::_dmf_binds_method;
223 methodOop m = (methodOop) target;
224 if (!m->is_static())
225 decode_flags_result |= MethodHandles::_dmf_has_receiver;
226 return m;
227 }
228 }
229 }
230 }
232 methodOop MethodHandles::decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
233 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), "");
234 for (oop amh = mh;;) {
235 // Adapter MHs can be stacked to convert several arguments.
236 int conv_op = adapter_conversion_op(sun_dyn_AdapterMethodHandle::conversion(amh));
237 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK;
238 oop target = java_dyn_MethodHandle::vmtarget(amh);
239 if (target == NULL) return NULL;
240 klassOop tk = target->klass();
241 if (tk == SystemDictionary::AdapterMethodHandle_klass()) {
242 amh = target;
243 continue;
244 } else {
245 // must be a BMH (which will bind some more arguments) or a DMH (for the final call)
246 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
247 }
248 }
249 }
251 methodOop MethodHandles::decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
252 if (mh == NULL) return NULL;
253 klassOop mhk = mh->klass();
254 assert(java_dyn_MethodHandle::is_subclass(mhk), "must be a MethodHandle");
255 if (mhk == SystemDictionary::DirectMethodHandle_klass()) {
256 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result);
257 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) {
258 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
259 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) {
260 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result);
261 } else if (sun_dyn_BoundMethodHandle::is_subclass(mhk)) {
262 // could be a JavaMethodHandle (but not an adapter MH)
263 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
264 } else {
265 assert(false, "cannot parse this MH");
266 return NULL; // random MH?
267 }
268 }
270 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) {
271 assert(m->is_method(), "");
272 if (m->is_static()) {
273 // check that signature begins '(L' or '([' (not '(I', '()', etc.)
274 symbolOop sig = m->signature();
275 BasicType recv_bt = char2type(sig->byte_at(1));
276 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')'
277 assert(sig->byte_at(0) == '(', "must be method sig");
278 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY)
279 // decode_flags_result |= _dmf_has_receiver;
280 } else {
281 // non-static method
282 decode_flags_result |= _dmf_has_receiver;
283 if (!m->can_be_statically_bound() && !m->is_initializer()) {
284 decode_flags_result |= _dmf_does_dispatch;
285 if (Klass::cast(m->method_holder())->is_interface())
286 decode_flags_result |= _dmf_from_interface;
287 }
288 }
289 return m;
290 }
293 // A trusted party is handing us a cookie to determine a method.
294 // Let's boil it down to the method oop they really want.
295 methodOop MethodHandles::decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result) {
296 decode_flags_result = 0;
297 receiver_limit_result = NULL;
298 klassOop xk = x->klass();
299 if (xk == Universe::methodKlassObj()) {
300 return decode_methodOop((methodOop) x, decode_flags_result);
301 } else if (xk == SystemDictionary::MemberName_klass()) {
302 // Note: This only works if the MemberName has already been resolved.
303 return decode_MemberName(x, receiver_limit_result, decode_flags_result);
304 } else if (java_dyn_MethodHandle::is_subclass(xk)) {
305 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result);
306 } else if (xk == SystemDictionary::reflect_Method_klass()) {
307 oop clazz = java_lang_reflect_Method::clazz(x);
308 int slot = java_lang_reflect_Method::slot(x);
309 klassOop k = java_lang_Class::as_klassOop(clazz);
310 if (k != NULL && Klass::cast(k)->oop_is_instance())
311 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
312 decode_flags_result);
313 } else if (xk == SystemDictionary::reflect_Constructor_klass()) {
314 oop clazz = java_lang_reflect_Constructor::clazz(x);
315 int slot = java_lang_reflect_Constructor::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 {
321 // unrecognized object
322 assert(!x->is_method(), "already checked");
323 assert(!sun_dyn_MemberName::is_instance(x), "already checked");
324 }
325 return NULL;
326 }
329 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) {
330 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass())
331 return 0; // no push/pop
332 int this_vmslots = java_dyn_MethodHandle::vmslots(mh);
333 int last_vmslots = 0;
334 oop last_mh = mh;
335 for (;;) {
336 oop target = java_dyn_MethodHandle::vmtarget(last_mh);
337 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
338 last_vmslots = java_dyn_MethodHandle::vmslots(target);
339 break;
340 } else if (!java_dyn_MethodHandle::is_instance(target)) {
341 // might be klass or method
342 assert(target->is_method(), "must get here with a direct ref to method");
343 last_vmslots = methodOop(target)->size_of_parameters();
344 break;
345 }
346 last_mh = target;
347 }
348 // If I am called with fewer VM slots than my ultimate callee,
349 // it must be that I push the additionally needed slots.
350 // Likewise if am called with more VM slots, I will pop them.
351 return (last_vmslots - this_vmslots);
352 }
355 // MemberName support
357 // import sun_dyn_MemberName.*
358 enum {
359 IS_METHOD = sun_dyn_MemberName::MN_IS_METHOD,
360 IS_CONSTRUCTOR = sun_dyn_MemberName::MN_IS_CONSTRUCTOR,
361 IS_FIELD = sun_dyn_MemberName::MN_IS_FIELD,
362 IS_TYPE = sun_dyn_MemberName::MN_IS_TYPE,
363 SEARCH_SUPERCLASSES = sun_dyn_MemberName::MN_SEARCH_SUPERCLASSES,
364 SEARCH_INTERFACES = sun_dyn_MemberName::MN_SEARCH_INTERFACES,
365 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE,
366 VM_INDEX_UNINITIALIZED = sun_dyn_MemberName::VM_INDEX_UNINITIALIZED
367 };
369 Handle MethodHandles::new_MemberName(TRAPS) {
370 Handle empty;
371 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
372 if (!k->is_initialized()) k->initialize(CHECK_(empty));
373 return Handle(THREAD, k->allocate_instance(THREAD));
374 }
376 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) {
377 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) {
378 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
379 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
380 int mods = java_lang_reflect_Field::modifiers(target_oop);
381 klassOop k = java_lang_Class::as_klassOop(clazz);
382 int offset = instanceKlass::cast(k)->offset_from_fields(slot);
383 init_MemberName(mname_oop, k, accessFlags_from(mods), offset);
384 } else {
385 int decode_flags = 0; klassOop receiver_limit = NULL;
386 methodOop m = MethodHandles::decode_method(target_oop,
387 receiver_limit, decode_flags);
388 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
389 init_MemberName(mname_oop, m, do_dispatch);
390 }
391 }
393 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) {
394 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD)
395 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ));
396 oop vmtarget = m;
397 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet
398 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound())
399 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch
400 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value");
401 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget);
402 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex);
403 sun_dyn_MemberName::set_flags(mname_oop, flags);
404 sun_dyn_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror());
405 }
407 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) {
408 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ));
409 oop vmtarget = field_holder;
410 int vmindex = offset; // determines the field uniquely when combined with static bit
411 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex");
412 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget);
413 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex);
414 sun_dyn_MemberName::set_flags(mname_oop, flags);
415 sun_dyn_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror());
416 }
419 methodOop MethodHandles::decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result) {
420 int flags = sun_dyn_MemberName::flags(mname);
421 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return NULL; // not invocable
422 oop vmtarget = sun_dyn_MemberName::vmtarget(mname);
423 int vmindex = sun_dyn_MemberName::vmindex(mname);
424 if (vmindex == VM_INDEX_UNINITIALIZED) return NULL; // not resolved
425 methodOop m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result);
426 oop clazz = sun_dyn_MemberName::clazz(mname);
427 if (clazz != NULL && java_lang_Class::is_instance(clazz)) {
428 klassOop klass = java_lang_Class::as_klassOop(clazz);
429 if (klass != NULL) receiver_limit_result = klass;
430 }
431 return m;
432 }
434 // An unresolved member name is a mere symbolic reference.
435 // Resolving it plants a vmtarget/vmindex in it,
436 // which refers dirctly to JVM internals.
437 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
438 assert(sun_dyn_MemberName::is_instance(mname()), "");
439 #ifdef ASSERT
440 // If this assert throws, renegotiate the sentinel value used by the Java code,
441 // so that it is distinct from any valid vtable index value, and any special
442 // values defined in methodOopDesc::VtableIndexFlag.
443 // The point of the slop is to give the Java code and the JVM some room
444 // to independently specify sentinel values.
445 const int sentinel_slop = 10;
446 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop;
447 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels");
448 #endif
449 if (sun_dyn_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED)
450 return; // already resolved
451 oop defc_oop = sun_dyn_MemberName::clazz(mname());
452 oop name_str = sun_dyn_MemberName::name(mname());
453 oop type_str = sun_dyn_MemberName::type(mname());
454 int flags = sun_dyn_MemberName::flags(mname());
456 if (defc_oop == NULL || name_str == NULL || type_str == NULL) {
457 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve");
458 }
459 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop);
460 defc_oop = NULL; // safety
461 if (defc_klassOop == NULL) return; // a primitive; no resolution possible
462 if (!Klass::cast(defc_klassOop)->oop_is_instance()) {
463 if (!Klass::cast(defc_klassOop)->oop_is_array()) return;
464 defc_klassOop = SystemDictionary::Object_klass();
465 }
466 instanceKlassHandle defc(THREAD, defc_klassOop);
467 defc_klassOop = NULL; // safety
468 if (defc.is_null()) {
469 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class");
470 }
471 defc->link_class(CHECK);
473 // convert the external string name to an internal symbol
474 symbolHandle name(THREAD, java_lang_String::as_symbol_or_null(name_str));
475 if (name.is_null()) return; // no such name
476 name_str = NULL; // safety
478 Handle polymorphic_method_type;
479 bool polymorphic_signature = false;
480 if ((flags & ALL_KINDS) == IS_METHOD &&
481 (defc() == SystemDictionary::InvokeDynamic_klass() ||
482 (defc() == SystemDictionary::MethodHandle_klass() &&
483 methodOopDesc::is_method_handle_invoke_name(name()))))
484 polymorphic_signature = true;
486 // convert the external string or reflective type to an internal signature
487 symbolHandle type; {
488 symbolOop type_sym = NULL;
489 if (java_dyn_MethodType::is_instance(type_str)) {
490 type_sym = java_dyn_MethodType::as_signature(type_str, polymorphic_signature, CHECK);
491 if (polymorphic_signature)
492 polymorphic_method_type = Handle(THREAD, type_str); //preserve exactly
493 } else if (java_lang_Class::is_instance(type_str)) {
494 type_sym = java_lang_Class::as_signature(type_str, false, CHECK);
495 } else if (java_lang_String::is_instance(type_str)) {
496 if (polymorphic_signature) {
497 type = java_lang_String::as_symbol(type_str, CHECK);
498 } else {
499 type_sym = java_lang_String::as_symbol_or_null(type_str);
500 }
501 } else {
502 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized type");
503 }
504 if (type_sym != NULL)
505 type = symbolHandle(THREAD, type_sym);
506 }
507 if (type.is_null()) return; // no such signature exists in the VM
508 type_str = NULL; // safety
510 // Time to do the lookup.
511 switch (flags & ALL_KINDS) {
512 case IS_METHOD:
513 {
514 CallInfo result;
515 {
516 EXCEPTION_MARK;
517 if ((flags & JVM_ACC_STATIC) != 0) {
518 LinkResolver::resolve_static_call(result,
519 defc, name, type, KlassHandle(), false, false, THREAD);
520 } else if (defc->is_interface()) {
521 LinkResolver::resolve_interface_call(result, Handle(), defc,
522 defc, name, type, KlassHandle(), false, false, THREAD);
523 } else {
524 LinkResolver::resolve_virtual_call(result, Handle(), defc,
525 defc, name, type, KlassHandle(), false, false, THREAD);
526 }
527 if (HAS_PENDING_EXCEPTION) {
528 CLEAR_PENDING_EXCEPTION;
529 break; // go to second chance
530 }
531 }
532 methodHandle m = result.resolved_method();
533 oop vmtarget = NULL;
534 int vmindex = methodOopDesc::nonvirtual_vtable_index;
535 if (defc->is_interface()) {
536 vmindex = klassItable::compute_itable_index(m());
537 assert(vmindex >= 0, "");
538 } else if (result.has_vtable_index()) {
539 vmindex = result.vtable_index();
540 assert(vmindex >= 0, "");
541 }
542 assert(vmindex != VM_INDEX_UNINITIALIZED, "");
543 if (vmindex < 0) {
544 assert(result.is_statically_bound(), "");
545 vmtarget = m();
546 } else {
547 vmtarget = result.resolved_klass()->as_klassOop();
548 }
549 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
550 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget);
551 sun_dyn_MemberName::set_vmindex(mname(), vmindex);
552 sun_dyn_MemberName::set_modifiers(mname(), mods);
553 DEBUG_ONLY(int junk; klassOop junk2);
554 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(),
555 "properly stored for later decoding");
556 return;
557 }
558 case IS_CONSTRUCTOR:
559 {
560 CallInfo result;
561 {
562 EXCEPTION_MARK;
563 if (name() == vmSymbols::object_initializer_name()) {
564 LinkResolver::resolve_special_call(result,
565 defc, name, type, KlassHandle(), false, THREAD);
566 } else {
567 break; // will throw after end of switch
568 }
569 if (HAS_PENDING_EXCEPTION) {
570 CLEAR_PENDING_EXCEPTION;
571 return;
572 }
573 }
574 assert(result.is_statically_bound(), "");
575 methodHandle m = result.resolved_method();
576 oop vmtarget = m();
577 int vmindex = methodOopDesc::nonvirtual_vtable_index;
578 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
579 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget);
580 sun_dyn_MemberName::set_vmindex(mname(), vmindex);
581 sun_dyn_MemberName::set_modifiers(mname(), mods);
582 DEBUG_ONLY(int junk; klassOop junk2);
583 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(),
584 "properly stored for later decoding");
585 return;
586 }
587 case IS_FIELD:
588 {
589 // This is taken from LinkResolver::resolve_field, sans access checks.
590 fieldDescriptor fd; // find_field initializes fd if found
591 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name(), type(), &fd));
592 // check if field exists; i.e., if a klass containing the field def has been selected
593 if (sel_klass.is_null()) return;
594 oop vmtarget = sel_klass->as_klassOop();
595 int vmindex = fd.offset();
596 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS);
597 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen
598 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget);
599 sun_dyn_MemberName::set_vmindex(mname(), vmindex);
600 sun_dyn_MemberName::set_modifiers(mname(), mods);
601 return;
602 }
603 default:
604 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
605 }
607 // Second chance.
608 if (polymorphic_method_type.not_null()) {
609 // Look on a non-null class loader.
610 Handle cur_class_loader;
611 const int nptypes = java_dyn_MethodType::ptype_count(polymorphic_method_type());
612 for (int i = 0; i <= nptypes; i++) {
613 oop type_mirror;
614 if (i < nptypes) type_mirror = java_dyn_MethodType::ptype(polymorphic_method_type(), i);
615 else type_mirror = java_dyn_MethodType::rtype(polymorphic_method_type());
616 klassOop example_type = java_lang_Class::as_klassOop(type_mirror);
617 if (example_type == NULL) continue;
618 oop class_loader = Klass::cast(example_type)->class_loader();
619 if (class_loader == NULL || class_loader == cur_class_loader()) continue;
620 cur_class_loader = Handle(THREAD, class_loader);
621 methodOop m = SystemDictionary::find_method_handle_invoke(name,
622 type,
623 KlassHandle(THREAD, example_type),
624 THREAD);
625 if (HAS_PENDING_EXCEPTION) {
626 CLEAR_PENDING_EXCEPTION;
627 m = NULL;
628 // try again with a different class loader...
629 }
630 if (m != NULL) {
631 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
632 sun_dyn_MemberName::set_vmtarget(mname(), m);
633 sun_dyn_MemberName::set_vmindex(mname(), m->vtable_index());
634 sun_dyn_MemberName::set_modifiers(mname(), mods);
635 return;
636 }
637 }
638 }
639 }
641 // Conversely, a member name which is only initialized from JVM internals
642 // may have null defc, name, and type fields.
643 // Resolving it plants a vmtarget/vmindex in it,
644 // which refers directly to JVM internals.
645 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
646 assert(sun_dyn_MemberName::is_instance(mname()), "");
647 oop vmtarget = sun_dyn_MemberName::vmtarget(mname());
648 int vmindex = sun_dyn_MemberName::vmindex(mname());
649 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) {
650 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
651 }
653 bool have_defc = (sun_dyn_MemberName::clazz(mname()) != NULL);
654 bool have_name = (sun_dyn_MemberName::name(mname()) != NULL);
655 bool have_type = (sun_dyn_MemberName::type(mname()) != NULL);
656 int flags = sun_dyn_MemberName::flags(mname());
658 if (suppress != 0) {
659 if (suppress & _suppress_defc) have_defc = true;
660 if (suppress & _suppress_name) have_name = true;
661 if (suppress & _suppress_type) have_type = true;
662 }
664 if (have_defc && have_name && have_type) return; // nothing needed
666 switch (flags & ALL_KINDS) {
667 case IS_METHOD:
668 case IS_CONSTRUCTOR:
669 {
670 klassOop receiver_limit = NULL;
671 int decode_flags = 0;
672 methodHandle m(THREAD, decode_vmtarget(vmtarget, vmindex, NULL,
673 receiver_limit, decode_flags));
674 if (m.is_null()) break;
675 if (!have_defc) {
676 klassOop defc = m->method_holder();
677 if (receiver_limit != NULL && receiver_limit != defc
678 && Klass::cast(receiver_limit)->is_subtype_of(defc))
679 defc = receiver_limit;
680 sun_dyn_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror());
681 }
682 if (!have_name) {
683 //not java_lang_String::create_from_symbol; let's intern member names
684 Handle name = StringTable::intern(m->name(), CHECK);
685 sun_dyn_MemberName::set_name(mname(), name());
686 }
687 if (!have_type) {
688 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
689 sun_dyn_MemberName::set_type(mname(), type());
690 }
691 return;
692 }
693 case IS_FIELD:
694 {
695 // This is taken from LinkResolver::resolve_field, sans access checks.
696 if (!vmtarget->is_klass()) break;
697 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break;
698 instanceKlassHandle defc(THREAD, (klassOop) vmtarget);
699 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
700 fieldDescriptor fd; // find_field initializes fd if found
701 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
702 break; // cannot expand
703 if (!have_defc) {
704 sun_dyn_MemberName::set_clazz(mname(), defc->java_mirror());
705 }
706 if (!have_name) {
707 //not java_lang_String::create_from_symbol; let's intern member names
708 Handle name = StringTable::intern(fd.name(), CHECK);
709 sun_dyn_MemberName::set_name(mname(), name());
710 }
711 if (!have_type) {
712 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
713 sun_dyn_MemberName::set_type(mname(), type());
714 }
715 return;
716 }
717 }
718 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
719 }
721 int MethodHandles::find_MemberNames(klassOop k,
722 symbolOop name, symbolOop sig,
723 int mflags, klassOop caller,
724 int skip, objArrayOop results) {
725 DEBUG_ONLY(No_Safepoint_Verifier nsv);
726 // this code contains no safepoints!
728 // %%% take caller into account!
730 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1;
732 int rfill = 0, rlimit = results->length(), rskip = skip;
733 // overflow measurement:
734 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
736 int match_flags = mflags;
737 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
738 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
739 bool local_only = !(search_superc | search_intfc);
740 bool classes_only = false;
742 if (name != NULL) {
743 if (name->utf8_length() == 0) return 0; // a match is not possible
744 }
745 if (sig != NULL) {
746 if (sig->utf8_length() == 0) return 0; // a match is not possible
747 if (sig->byte_at(0) == '(')
748 match_flags &= ~(IS_FIELD | IS_TYPE);
749 else
750 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
751 }
753 if ((match_flags & IS_TYPE) != 0) {
754 // NYI, and Core Reflection works quite well for this query
755 }
757 if ((match_flags & IS_FIELD) != 0) {
758 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
759 if (name != NULL && st.name() != name)
760 continue;
761 if (sig != NULL && st.signature() != sig)
762 continue;
763 // passed the filters
764 if (rskip > 0) {
765 --rskip;
766 } else if (rfill < rlimit) {
767 oop result = results->obj_at(rfill++);
768 if (!sun_dyn_MemberName::is_instance(result))
769 return -99; // caller bug!
770 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset());
771 } else if (++overflow >= overflow_limit) {
772 match_flags = 0; break; // got tired of looking at overflow
773 }
774 }
775 }
777 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
778 // watch out for these guys:
779 symbolOop init_name = vmSymbols::object_initializer_name();
780 symbolOop clinit_name = vmSymbols::class_initializer_name();
781 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
782 bool negate_name_test = false;
783 // fix name so that it captures the intention of IS_CONSTRUCTOR
784 if (!(match_flags & IS_METHOD)) {
785 // constructors only
786 if (name == NULL) {
787 name = init_name;
788 } else if (name != init_name) {
789 return 0; // no constructors of this method name
790 }
791 } else if (!(match_flags & IS_CONSTRUCTOR)) {
792 // methods only
793 if (name == NULL) {
794 name = init_name;
795 negate_name_test = true; // if we see the name, we *omit* the entry
796 } else if (name == init_name) {
797 return 0; // no methods of this constructor name
798 }
799 } else {
800 // caller will accept either sort; no need to adjust name
801 }
802 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
803 methodOop m = st.method();
804 symbolOop m_name = m->name();
805 if (m_name == clinit_name)
806 continue;
807 if (name != NULL && ((m_name != name) ^ negate_name_test))
808 continue;
809 if (sig != NULL && m->signature() != sig)
810 continue;
811 // passed the filters
812 if (rskip > 0) {
813 --rskip;
814 } else if (rfill < rlimit) {
815 oop result = results->obj_at(rfill++);
816 if (!sun_dyn_MemberName::is_instance(result))
817 return -99; // caller bug!
818 MethodHandles::init_MemberName(result, m, true);
819 } else if (++overflow >= overflow_limit) {
820 match_flags = 0; break; // got tired of looking at overflow
821 }
822 }
823 }
825 // return number of elements we at leasted wanted to initialize
826 return rfill + overflow;
827 }
830 // Decode this java.lang.Class object into an instanceKlass, if possible.
831 // Throw IAE if not
832 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) {
833 instanceKlassHandle empty;
834 klassOop caller = NULL;
835 if (java_lang_Class::is_instance(java_mirror_oop)) {
836 caller = java_lang_Class::as_klassOop(java_mirror_oop);
837 }
838 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) {
839 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty);
840 }
841 return instanceKlassHandle(THREAD, caller);
842 }
846 // Decode the vmtarget field of a method handle.
847 // Sanitize out methodOops, klassOops, and any other non-Java data.
848 // This is for debugging and reflection.
849 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) {
850 assert(java_dyn_MethodHandle::is_instance(mh()), "must be a MH");
851 if (format == ETF_HANDLE_OR_METHOD_NAME) {
852 oop target = java_dyn_MethodHandle::vmtarget(mh());
853 if (target == NULL) {
854 return NULL; // unformed MH
855 }
856 klassOop tklass = target->klass();
857 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) {
858 return target; // target is another MH (or something else?)
859 }
860 }
861 if (format == ETF_DIRECT_HANDLE) {
862 oop target = mh();
863 for (;;) {
864 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
865 return target;
866 }
867 if (!java_dyn_MethodHandle::is_instance(target)){
868 return NULL; // unformed MH
869 }
870 target = java_dyn_MethodHandle::vmtarget(target);
871 }
872 }
873 // cases of metadata in MH.vmtarget:
874 // - AMH can have methodOop for static invoke with bound receiver
875 // - DMH can have methodOop for static invoke (on variable receiver)
876 // - DMH can have klassOop for dispatched (non-static) invoke
877 klassOop receiver_limit = NULL;
878 int decode_flags = 0;
879 methodOop m = decode_MethodHandle(mh(), receiver_limit, decode_flags);
880 if (m == NULL) return NULL;
881 switch (format) {
882 case ETF_REFLECT_METHOD:
883 // same as jni_ToReflectedMethod:
884 if (m->is_initializer()) {
885 return Reflection::new_constructor(m, THREAD);
886 } else {
887 return Reflection::new_method(m, UseNewReflection, false, THREAD);
888 }
890 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle
891 case ETF_METHOD_NAME:
892 {
893 if (SystemDictionary::MemberName_klass() == NULL) break;
894 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass());
895 mname_klass->initialize(CHECK_NULL);
896 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL);
897 sun_dyn_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED);
898 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
899 init_MemberName(mname(), m, do_dispatch);
900 expand_MemberName(mname, 0, CHECK_NULL);
901 return mname();
902 }
903 }
905 // Unknown format code.
906 char msg[50];
907 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format);
908 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg);
909 }
911 static const char* always_null_names[] = {
912 "java/lang/Void",
913 "java/lang/Null",
914 //"java/lang/Nothing",
915 "sun/dyn/empty/Empty",
916 NULL
917 };
919 static bool is_always_null_type(klassOop klass) {
920 if (!Klass::cast(klass)->oop_is_instance()) return false;
921 instanceKlass* ik = instanceKlass::cast(klass);
922 // Must be on the boot class path:
923 if (ik->class_loader() != NULL) return false;
924 // Check the name.
925 symbolOop name = ik->name();
926 for (int i = 0; ; i++) {
927 const char* test_name = always_null_names[i];
928 if (test_name == NULL) break;
929 if (name->equals(test_name))
930 return true;
931 }
932 return false;
933 }
935 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) {
936 if (src == dst || dst == SystemDictionary::Object_klass())
937 return false; // quickest checks
938 Klass* srck = Klass::cast(src);
939 Klass* dstk = Klass::cast(dst);
940 if (dstk->is_interface()) {
941 // interface receivers can safely be viewed as untyped,
942 // because interface calls always include a dynamic check
943 //dstk = Klass::cast(SystemDictionary::Object_klass());
944 return false;
945 }
946 if (srck->is_interface()) {
947 // interface arguments must be viewed as untyped
948 //srck = Klass::cast(SystemDictionary::Object_klass());
949 return true;
950 }
951 if (is_always_null_type(src)) {
952 // some source types are known to be never instantiated;
953 // they represent references which are always null
954 // such null references never fail to convert safely
955 return false;
956 }
957 return !srck->is_subclass_of(dstk->as_klassOop());
958 }
960 static oop object_java_mirror() {
961 return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
962 }
964 bool MethodHandles::same_basic_type_for_arguments(BasicType src,
965 BasicType dst,
966 bool raw,
967 bool for_return) {
968 if (for_return) {
969 // return values can always be forgotten:
970 if (dst == T_VOID) return true;
971 if (src == T_VOID) return raw && (dst == T_INT);
972 // We allow caller to receive a garbage int, which is harmless.
973 // This trick is pulled by trusted code (see VerifyType.canPassRaw).
974 }
975 assert(src != T_VOID && dst != T_VOID, "should not be here");
976 if (src == dst) return true;
977 if (type2size[src] != type2size[dst]) return false;
978 // allow reinterpretation casts for integral widening
979 if (is_subword_type(src)) { // subwords can fit in int or other subwords
980 if (dst == T_INT) // any subword fits in an int
981 return true;
982 if (src == T_BOOLEAN) // boolean fits in any subword
983 return is_subword_type(dst);
984 if (src == T_BYTE && dst == T_SHORT)
985 return true; // remaining case: byte fits in short
986 }
987 // allow float/fixed reinterpretation casts
988 if (src == T_FLOAT) return dst == T_INT;
989 if (src == T_INT) return dst == T_FLOAT;
990 if (src == T_DOUBLE) return dst == T_LONG;
991 if (src == T_LONG) return dst == T_DOUBLE;
992 return false;
993 }
995 const char* MethodHandles::check_method_receiver(methodOop m,
996 klassOop passed_recv_type) {
997 assert(!m->is_static(), "caller resp.");
998 if (passed_recv_type == NULL)
999 return "receiver type is primitive";
1000 if (class_cast_needed(passed_recv_type, m->method_holder())) {
1001 Klass* formal = Klass::cast(m->method_holder());
1002 return SharedRuntime::generate_class_cast_message("receiver type",
1003 formal->external_name());
1004 }
1005 return NULL; // checks passed
1006 }
1008 // Verify that m's signature can be called type-safely by a method handle
1009 // of the given method type 'mtype'.
1010 // It takes a TRAPS argument because it must perform symbol lookups.
1011 void MethodHandles::verify_method_signature(methodHandle m,
1012 Handle mtype,
1013 int first_ptype_pos,
1014 KlassHandle insert_ptype,
1015 TRAPS) {
1016 objArrayHandle ptypes(THREAD, java_dyn_MethodType::ptypes(mtype()));
1017 int pnum = first_ptype_pos;
1018 int pmax = ptypes->length();
1019 int mnum = 0; // method argument
1020 const char* err = NULL;
1021 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
1022 oop ptype_oop = NULL;
1023 if (ss.at_return_type()) {
1024 if (pnum != pmax)
1025 { err = "too many arguments"; break; }
1026 ptype_oop = java_dyn_MethodType::rtype(mtype());
1027 } else {
1028 if (pnum >= pmax)
1029 { err = "not enough arguments"; break; }
1030 if (pnum >= 0)
1031 ptype_oop = ptypes->obj_at(pnum);
1032 else if (insert_ptype.is_null())
1033 ptype_oop = NULL;
1034 else
1035 ptype_oop = insert_ptype->java_mirror();
1036 pnum += 1;
1037 mnum += 1;
1038 }
1039 klassOop pklass = NULL;
1040 BasicType ptype = T_OBJECT;
1041 if (ptype_oop != NULL)
1042 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass);
1043 else
1044 // null does not match any non-reference; use Object to report the error
1045 pklass = SystemDictionary::Object_klass();
1046 klassOop mklass = NULL;
1047 BasicType mtype = ss.type();
1048 if (mtype == T_ARRAY) mtype = T_OBJECT; // fold all refs to T_OBJECT
1049 if (mtype == T_OBJECT) {
1050 if (ptype_oop == NULL) {
1051 // null matches any reference
1052 continue;
1053 }
1054 KlassHandle pklass_handle(THREAD, pklass); pklass = NULL;
1055 // If we fail to resolve types at this point, we will throw an error.
1056 symbolOop name_oop = ss.as_symbol(CHECK);
1057 symbolHandle name(THREAD, name_oop);
1058 instanceKlass* mk = instanceKlass::cast(m->method_holder());
1059 Handle loader(THREAD, mk->class_loader());
1060 Handle domain(THREAD, mk->protection_domain());
1061 mklass = SystemDictionary::resolve_or_null(name, loader, domain, CHECK);
1062 pklass = pklass_handle();
1063 if (mklass == NULL && pklass != NULL &&
1064 Klass::cast(pklass)->name() == name() &&
1065 m->is_method_handle_invoke()) {
1066 // Assume a match. We can't really decode the signature of MH.invoke*.
1067 continue;
1068 }
1069 }
1070 if (!ss.at_return_type()) {
1071 err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum);
1072 } else {
1073 err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal!
1074 }
1075 if (err != NULL) break;
1076 }
1078 if (err != NULL) {
1079 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1080 }
1081 }
1083 // Main routine for verifying the MethodHandle.type of a proposed
1084 // direct or bound-direct method handle.
1085 void MethodHandles::verify_method_type(methodHandle m,
1086 Handle mtype,
1087 bool has_bound_recv,
1088 KlassHandle bound_recv_type,
1089 TRAPS) {
1090 bool m_needs_receiver = !m->is_static();
1092 const char* err = NULL;
1094 int first_ptype_pos = m_needs_receiver ? 1 : 0;
1095 if (has_bound_recv) {
1096 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them
1097 if (m_needs_receiver && bound_recv_type.is_null())
1098 { err = "bound receiver is not an object"; goto die; }
1099 }
1101 if (m_needs_receiver && err == NULL) {
1102 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype());
1103 if (ptypes->length() < first_ptype_pos)
1104 { err = "receiver argument is missing"; goto die; }
1105 if (has_bound_recv)
1106 err = check_method_receiver(m(), bound_recv_type->as_klassOop());
1107 else
1108 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1)));
1109 if (err != NULL) goto die;
1110 }
1112 // Check the other arguments for mistypes.
1113 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK);
1114 return;
1116 die:
1117 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1118 }
1120 void MethodHandles::verify_vmslots(Handle mh, TRAPS) {
1121 // Verify vmslots.
1122 int check_slots = argument_slot_count(java_dyn_MethodHandle::type(mh()));
1123 if (java_dyn_MethodHandle::vmslots(mh()) != check_slots) {
1124 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH");
1125 }
1126 }
1128 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) {
1129 // Verify that argslot points at the given argnum.
1130 int check_slot = argument_slot(java_dyn_MethodHandle::type(mh()), argnum);
1131 if (argslot != check_slot || argslot < 0) {
1132 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d";
1133 size_t msglen = strlen(fmt) + 3*11 + 1;
1134 char* msg = NEW_RESOURCE_ARRAY(char, msglen);
1135 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot);
1136 THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
1137 }
1138 }
1140 // Verify the correspondence between two method types.
1141 // Apart from the advertised changes, caller method type X must
1142 // be able to invoke the callee method Y type with no violations
1143 // of type integrity.
1144 // Return NULL if all is well, else a short error message.
1145 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end,
1146 int insert_argnum, oop insert_type,
1147 int change_argnum, oop change_type,
1148 int delete_argnum,
1149 oop dst_mtype, int dst_beg, int dst_end,
1150 bool raw) {
1151 objArrayOop src_ptypes = java_dyn_MethodType::ptypes(src_mtype);
1152 objArrayOop dst_ptypes = java_dyn_MethodType::ptypes(dst_mtype);
1154 int src_max = src_ptypes->length();
1155 int dst_max = dst_ptypes->length();
1157 if (src_end == -1) src_end = src_max;
1158 if (dst_end == -1) dst_end = dst_max;
1160 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob");
1161 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob");
1163 // pending actions; set to -1 when done:
1164 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum;
1166 const char* err = NULL;
1168 // Walk along each array of parameter types, including a virtual
1169 // NULL end marker at the end of each.
1170 for (int src_idx = src_beg, dst_idx = dst_beg;
1171 (src_idx <= src_end && dst_idx <= dst_end);
1172 src_idx++, dst_idx++) {
1173 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx);
1174 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx);
1175 bool fix_null_src_type = false;
1177 // Perform requested edits.
1178 if (ins_idx == src_idx) {
1179 // note that the inserted guy is never affected by a change or deletion
1180 ins_idx = -1;
1181 src_type = insert_type;
1182 fix_null_src_type = true;
1183 --src_idx; // back up to process src type on next loop
1184 src_idx = src_end;
1185 } else {
1186 // note that the changed guy can be immediately deleted
1187 if (chg_idx == src_idx) {
1188 chg_idx = -1;
1189 assert(src_idx < src_end, "oob");
1190 src_type = change_type;
1191 fix_null_src_type = true;
1192 }
1193 if (del_idx == src_idx) {
1194 del_idx = -1;
1195 assert(src_idx < src_end, "oob");
1196 --dst_idx;
1197 continue; // rerun loop after skipping this position
1198 }
1199 }
1201 if (src_type == NULL && fix_null_src_type)
1202 // explicit null in this case matches any dest reference
1203 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type);
1205 // Compare the two argument types.
1206 if (src_type != dst_type) {
1207 if (src_type == NULL) return "not enough arguments";
1208 if (dst_type == NULL) return "too many arguments";
1209 err = check_argument_type_change(src_type, dst_type, dst_idx, raw);
1210 if (err != NULL) return err;
1211 }
1212 }
1214 // Now compare return types also.
1215 oop src_rtype = java_dyn_MethodType::rtype(src_mtype);
1216 oop dst_rtype = java_dyn_MethodType::rtype(dst_mtype);
1217 if (src_rtype != dst_rtype) {
1218 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal!
1219 if (err != NULL) return err;
1220 }
1222 assert(err == NULL, "");
1223 return NULL; // all is well
1224 }
1227 const char* MethodHandles::check_argument_type_change(BasicType src_type,
1228 klassOop src_klass,
1229 BasicType dst_type,
1230 klassOop dst_klass,
1231 int argnum,
1232 bool raw) {
1233 const char* err = NULL;
1234 bool for_return = (argnum < 0);
1236 // just in case:
1237 if (src_type == T_ARRAY) src_type = T_OBJECT;
1238 if (dst_type == T_ARRAY) dst_type = T_OBJECT;
1240 // Produce some nice messages if VerifyMethodHandles is turned on:
1241 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) {
1242 if (src_type == T_OBJECT) {
1243 if (raw && dst_type == T_INT && is_always_null_type(src_klass))
1244 return NULL; // OK to convert a null pointer to a garbage int
1245 err = ((argnum >= 0)
1246 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s"
1247 : "type mismatch: returning a %s, but caller expects primitive %s");
1248 } else if (dst_type == T_OBJECT) {
1249 err = ((argnum >= 0)
1250 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s"
1251 : "type mismatch: returning a primitive %s, but caller expects %s");
1252 } else {
1253 err = ((argnum >= 0)
1254 ? "type mismatch: passing a %s for method argument #%d, which expects %s"
1255 : "type mismatch: returning a %s, but caller expects %s");
1256 }
1257 } else if (src_type == T_OBJECT && dst_type == T_OBJECT &&
1258 class_cast_needed(src_klass, dst_klass)) {
1259 if (!class_cast_needed(dst_klass, src_klass)) {
1260 if (raw)
1261 return NULL; // reverse cast is OK; the MH target is trusted to enforce it
1262 err = ((argnum >= 0)
1263 ? "cast required: passing a %s for method argument #%d, which expects %s"
1264 : "cast required: returning a %s, but caller expects %s");
1265 } else {
1266 err = ((argnum >= 0)
1267 ? "reference mismatch: passing a %s for method argument #%d, which expects %s"
1268 : "reference mismatch: returning a %s, but caller expects %s");
1269 }
1270 } else {
1271 // passed the obstacle course
1272 return NULL;
1273 }
1275 // format, format, format
1276 const char* src_name = type2name(src_type);
1277 const char* dst_name = type2name(dst_type);
1278 if (src_type == T_OBJECT) src_name = Klass::cast(src_klass)->external_name();
1279 if (dst_type == T_OBJECT) dst_name = Klass::cast(dst_klass)->external_name();
1280 if (src_name == NULL) src_name = "unknown type";
1281 if (dst_name == NULL) dst_name = "unknown type";
1283 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11);
1284 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1);
1285 if (argnum >= 0) {
1286 assert(strstr(err, "%d") != NULL, "");
1287 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name);
1288 } else {
1289 assert(strstr(err, "%d") == NULL, "");
1290 jio_snprintf(msg, msglen, err, src_name, dst_name);
1291 }
1292 return msg;
1293 }
1295 // Compute the depth within the stack of the given argument, i.e.,
1296 // the combined size of arguments to the right of the given argument.
1297 // For the last argument (ptypes.length-1) this will be zero.
1298 // For the first argument (0) this will be the size of all
1299 // arguments but that one. For the special number -1, this
1300 // will be the size of all arguments, including the first.
1301 // If the argument is neither -1 nor a valid argument index,
1302 // then return a negative number. Otherwise, the result
1303 // is in the range [0..vmslots] inclusive.
1304 int MethodHandles::argument_slot(oop method_type, int arg) {
1305 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type);
1306 int argslot = 0;
1307 int len = ptypes->length();
1308 if (arg < -1 || arg >= len) return -99;
1309 for (int i = len-1; i > arg; i--) {
1310 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1311 argslot += type2size[bt];
1312 }
1313 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works");
1314 return argslot;
1315 }
1317 // Given a slot number, return the argument number.
1318 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) {
1319 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type);
1320 int argslot = 0;
1321 int len = ptypes->length();
1322 for (int i = len-1; i >= 0; i--) {
1323 if (query_argslot == argslot) return i;
1324 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1325 argslot += type2size[bt];
1326 }
1327 // return pseudo-arg deepest in stack:
1328 if (query_argslot == argslot) return -1;
1329 return -99; // oob slot, or splitting a double-slot arg
1330 }
1332 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m,
1333 KlassHandle receiver_limit,
1334 int decode_flags,
1335 KlassHandle receiver_klass,
1336 TRAPS) {
1337 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference");
1338 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument");
1340 if (!m->is_static() &&
1341 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder())))
1342 // given type does not match class of method, or receiver is null!
1343 // caller should have checked this, but let's be extra careful...
1344 return methodHandle();
1346 if (receiver_limit.not_null() &&
1347 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit())))
1348 // given type is not limited to the receiver type
1349 // note that a null receiver can match any reference value, for a static method
1350 return methodHandle();
1352 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) {
1353 // pre-dispatched or static method (null receiver is OK for static)
1354 return m;
1356 } else if (receiver_klass.is_null()) {
1357 // null receiver value; cannot dispatch
1358 return methodHandle();
1360 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) {
1361 // perform virtual dispatch
1362 int vtable_index = m->vtable_index();
1363 guarantee(vtable_index >= 0, "valid vtable index");
1365 // receiver_klass might be an arrayKlassOop but all vtables start at
1366 // the same place. The cast is to avoid virtual call and assertion.
1367 // See also LinkResolver::runtime_resolve_virtual_method.
1368 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass());
1369 DEBUG_ONLY(inst->verify_vtable_index(vtable_index));
1370 methodOop m_oop = inst->method_at_vtable(vtable_index);
1371 return methodHandle(THREAD, m_oop);
1373 } else {
1374 // perform interface dispatch
1375 int itable_index = klassItable::compute_itable_index(m());
1376 guarantee(itable_index >= 0, "valid itable index");
1377 instanceKlass* inst = instanceKlass::cast(receiver_klass());
1378 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD);
1379 return methodHandle(THREAD, m_oop);
1380 }
1381 }
1383 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) {
1384 // Verify type.
1385 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh()));
1386 verify_method_type(m, mtype, false, KlassHandle(), CHECK);
1388 // Verify vmslots.
1389 if (java_dyn_MethodHandle::vmslots(mh()) != m->size_of_parameters()) {
1390 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH");
1391 }
1392 }
1394 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) {
1395 // Check arguments.
1396 if (mh.is_null() || m.is_null() ||
1397 (!do_dispatch && m->is_abstract())) {
1398 THROW(vmSymbols::java_lang_InternalError());
1399 }
1401 java_dyn_MethodHandle::init_vmslots(mh());
1403 if (VerifyMethodHandles) {
1404 // The privileged code which invokes this routine should not make
1405 // a mistake about types, but it's better to verify.
1406 verify_DirectMethodHandle(mh, m, CHECK);
1407 }
1409 // Finally, after safety checks are done, link to the target method.
1410 // We will follow the same path as the latter part of
1411 // InterpreterRuntime::resolve_invoke(), which first finds the method
1412 // and then decides how to populate the constant pool cache entry
1413 // that links the interpreter calls to the method. We need the same
1414 // bits, and will use the same calling sequence code.
1416 int vmindex = methodOopDesc::garbage_vtable_index;
1417 oop vmtarget = NULL;
1419 instanceKlass::cast(m->method_holder())->link_class(CHECK);
1421 MethodHandleEntry* me = NULL;
1422 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) {
1423 // We are simulating an invokeinterface instruction.
1424 // (We might also be simulating an invokevirtual on a miranda method,
1425 // but it is safe to treat it as an invokeinterface.)
1426 assert(!m->can_be_statically_bound(), "no final methods on interfaces");
1427 vmindex = klassItable::compute_itable_index(m());
1428 assert(vmindex >= 0, "(>=0) == do_dispatch");
1429 // Set up same bits as ConstantPoolCacheEntry::set_interface_call().
1430 vmtarget = m->method_holder(); // the interface
1431 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh);
1432 } else if (!do_dispatch || m->can_be_statically_bound()) {
1433 // We are simulating an invokestatic or invokespecial instruction.
1434 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method().
1435 vmtarget = m();
1436 // this does not help dispatch, but it will make it possible to parse this MH:
1437 vmindex = methodOopDesc::nonvirtual_vtable_index;
1438 assert(vmindex < 0, "(>=0) == do_dispatch");
1439 if (!m->is_static()) {
1440 me = MethodHandles::entry(MethodHandles::_invokespecial_mh);
1441 } else {
1442 me = MethodHandles::entry(MethodHandles::_invokestatic_mh);
1443 // Part of the semantics of a static call is an initialization barrier.
1444 // For a DMH, it is done now, when the handle is created.
1445 Klass* k = Klass::cast(m->method_holder());
1446 if (k->should_be_initialized()) {
1447 k->initialize(CHECK);
1448 }
1449 }
1450 } else {
1451 // We are simulating an invokevirtual instruction.
1452 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method().
1453 // The key logic is LinkResolver::runtime_resolve_virtual_method.
1454 vmindex = m->vtable_index();
1455 vmtarget = m->method_holder();
1456 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh);
1457 }
1459 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
1461 sun_dyn_DirectMethodHandle::set_vmtarget(mh(), vmtarget);
1462 sun_dyn_DirectMethodHandle::set_vmindex(mh(), vmindex);
1463 DEBUG_ONLY(int flags; klassOop rlimit);
1464 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(),
1465 "properly stored for later decoding");
1466 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0));
1467 assert(!(actual_do_dispatch && !do_dispatch),
1468 "do not perform dispatch if !do_dispatch specified");
1469 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch");
1470 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack");
1472 // Done!
1473 java_dyn_MethodHandle::set_vmentry(mh(), me);
1474 }
1476 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh,
1477 methodHandle m,
1478 TRAPS) {
1479 // Verify type.
1480 oop receiver = sun_dyn_BoundMethodHandle::argument(mh());
1481 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh()));
1482 KlassHandle bound_recv_type;
1483 if (receiver != NULL) bound_recv_type = KlassHandle(THREAD, receiver->klass());
1484 verify_method_type(m, mtype, true, bound_recv_type, CHECK);
1486 int receiver_pos = m->size_of_parameters() - 1;
1488 // Verify MH.vmargslot, which should point at the bound receiver.
1489 verify_vmargslot(mh, -1, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK);
1490 //verify_vmslots(mh, CHECK);
1492 // Verify vmslots.
1493 if (java_dyn_MethodHandle::vmslots(mh()) != receiver_pos) {
1494 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)");
1495 }
1496 }
1498 // Initialize a BMH with a receiver bound directly to a methodOop.
1499 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh,
1500 methodHandle original_m,
1501 KlassHandle receiver_limit,
1502 int decode_flags,
1503 TRAPS) {
1504 // Check arguments.
1505 if (mh.is_null() || original_m.is_null()) {
1506 THROW(vmSymbols::java_lang_InternalError());
1507 }
1509 KlassHandle receiver_klass;
1510 {
1511 oop receiver_oop = sun_dyn_BoundMethodHandle::argument(mh());
1512 if (receiver_oop != NULL)
1513 receiver_klass = KlassHandle(THREAD, receiver_oop->klass());
1514 }
1515 methodHandle m = dispatch_decoded_method(original_m,
1516 receiver_limit, decode_flags,
1517 receiver_klass,
1518 CHECK);
1519 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); }
1520 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); }
1522 java_dyn_MethodHandle::init_vmslots(mh());
1524 if (VerifyMethodHandles) {
1525 verify_BoundMethodHandle_with_receiver(mh, m, CHECK);
1526 }
1528 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m());
1530 DEBUG_ONLY(int junk; klassOop junk2);
1531 assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding");
1532 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot");
1534 // Done!
1535 java_dyn_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh));
1536 }
1538 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
1539 bool direct_to_method, TRAPS) {
1540 Handle ptype_handle(THREAD,
1541 java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum));
1542 KlassHandle ptype_klass;
1543 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass);
1544 int slots_pushed = type2size[ptype];
1546 oop argument = sun_dyn_BoundMethodHandle::argument(mh());
1548 const char* err = NULL;
1550 switch (ptype) {
1551 case T_OBJECT:
1552 if (argument != NULL)
1553 // we must implicitly convert from the arg type to the outgoing ptype
1554 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum);
1555 break;
1557 case T_ARRAY: case T_VOID:
1558 assert(false, "array, void do not appear here");
1559 default:
1560 if (ptype != T_INT && !is_subword_type(ptype)) {
1561 err = "unexpected parameter type";
1562 break;
1563 }
1564 // check subrange of Integer.value, if necessary
1565 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) {
1566 err = "bound integer argument must be of type java.lang.Integer";
1567 break;
1568 }
1569 if (ptype != T_INT) {
1570 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
1571 jint value = argument->int_field(value_offset);
1572 int vminfo = adapter_subword_vminfo(ptype);
1573 jint subword = truncate_subword_from_vminfo(value, vminfo);
1574 if (value != subword) {
1575 err = "bound subword value does not fit into the subword type";
1576 break;
1577 }
1578 }
1579 break;
1580 case T_FLOAT:
1581 case T_DOUBLE:
1582 case T_LONG:
1583 {
1584 // we must implicitly convert from the unboxed arg type to the outgoing ptype
1585 BasicType argbox = java_lang_boxing_object::basic_type(argument);
1586 if (argbox != ptype) {
1587 err = check_argument_type_change(T_OBJECT, (argument == NULL
1588 ? SystemDictionary::Object_klass()
1589 : argument->klass()),
1590 ptype, ptype_klass(), argnum);
1591 assert(err != NULL, "this must be an error");
1592 }
1593 break;
1594 }
1595 }
1597 if (err == NULL) {
1598 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1599 if (direct_to_method) {
1600 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots");
1601 assert(slots_pushed <= MethodHandlePushLimit, "");
1602 } else {
1603 int target_pushes = decode_MethodHandle_stack_pushes(target());
1604 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct");
1605 // do not blow the stack; use a Java-based adapter if this limit is exceeded
1606 // FIXME
1607 // if (slots_pushed + target_pushes > MethodHandlePushLimit)
1608 // err = "too many bound parameters";
1609 }
1610 }
1612 if (err == NULL) {
1613 // Verify the rest of the method type.
1614 err = check_method_type_insertion(java_dyn_MethodHandle::type(mh()),
1615 argnum, ptype_handle(),
1616 java_dyn_MethodHandle::type(target()));
1617 }
1619 if (err != NULL) {
1620 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1621 }
1622 }
1624 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
1625 // Check arguments.
1626 if (mh.is_null() || target.is_null() || !java_dyn_MethodHandle::is_instance(target())) {
1627 THROW(vmSymbols::java_lang_InternalError());
1628 }
1630 java_dyn_MethodHandle::init_vmslots(mh());
1632 if (VerifyMethodHandles) {
1633 int insert_after = argnum - 1;
1634 verify_vmargslot(mh, insert_after, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK);
1635 verify_vmslots(mh, CHECK);
1636 }
1638 // Get bound type and required slots.
1639 oop ptype_oop = java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum);
1640 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop);
1641 int slots_pushed = type2size[ptype];
1643 // If (a) the target is a direct non-dispatched method handle,
1644 // or (b) the target is a dispatched direct method handle and we
1645 // are binding the receiver, cut out the middle-man.
1646 // Do this by decoding the DMH and using its methodOop directly as vmtarget.
1647 bool direct_to_method = false;
1648 if (OptimizeMethodHandles &&
1649 target->klass() == SystemDictionary::DirectMethodHandle_klass() &&
1650 (argnum == 0 || sun_dyn_DirectMethodHandle::vmindex(target()) < 0)) {
1651 int decode_flags = 0; klassOop receiver_limit_oop = NULL;
1652 methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags));
1653 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); }
1654 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg.
1655 assert(sun_dyn_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig");
1656 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) {
1657 KlassHandle receiver_limit(THREAD, receiver_limit_oop);
1658 init_BoundMethodHandle_with_receiver(mh, m,
1659 receiver_limit, decode_flags,
1660 CHECK);
1661 return;
1662 }
1664 // Even if it is not a bound receiver, we still might be able
1665 // to bind another argument and still invoke the methodOop directly.
1666 if (!(decode_flags & _dmf_does_dispatch)) {
1667 direct_to_method = true;
1668 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m());
1669 }
1670 }
1671 if (!direct_to_method)
1672 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), target());
1674 if (VerifyMethodHandles) {
1675 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK);
1676 }
1678 // Next question: Is this a ref, int, or long bound value?
1679 MethodHandleEntry* me = NULL;
1680 if (ptype == T_OBJECT) {
1681 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh);
1682 else me = MethodHandles::entry(_bound_ref_mh);
1683 } else if (slots_pushed == 2) {
1684 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh);
1685 else me = MethodHandles::entry(_bound_long_mh);
1686 } else if (slots_pushed == 1) {
1687 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh);
1688 else me = MethodHandles::entry(_bound_int_mh);
1689 } else {
1690 assert(false, "");
1691 }
1693 // Done!
1694 java_dyn_MethodHandle::set_vmentry(mh(), me);
1695 }
1697 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) {
1698 char msg[200];
1699 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err);
1700 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg);
1701 }
1703 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) {
1704 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh());
1705 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh());
1707 verify_vmargslot(mh, argnum, argslot, CHECK);
1708 verify_vmslots(mh, CHECK);
1710 jint conv_op = adapter_conversion_op(conversion);
1711 if (!conv_op_valid(conv_op)) {
1712 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD);
1713 return;
1714 }
1715 EntryKind ek = adapter_entry_kind(conv_op);
1717 int stack_move = adapter_conversion_stack_move(conversion);
1718 BasicType src = adapter_conversion_src_type(conversion);
1719 BasicType dest = adapter_conversion_dest_type(conversion);
1720 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
1722 Handle argument(THREAD, sun_dyn_AdapterMethodHandle::argument(mh()));
1723 Handle target(THREAD, sun_dyn_AdapterMethodHandle::vmtarget(mh()));
1724 Handle src_mtype(THREAD, java_dyn_MethodHandle::type(mh()));
1725 Handle dst_mtype(THREAD, java_dyn_MethodHandle::type(target()));
1727 const char* err = NULL;
1729 if (err == NULL) {
1730 // Check that the correct argument is supplied, but only if it is required.
1731 switch (ek) {
1732 case _adapter_check_cast: // target type of cast
1733 case _adapter_ref_to_prim: // wrapper type from which to unbox
1734 case _adapter_prim_to_ref: // wrapper type to box into
1735 case _adapter_collect_args: // array type to collect into
1736 case _adapter_spread_args: // array type to spread from
1737 if (!java_lang_Class::is_instance(argument())
1738 || java_lang_Class::is_primitive(argument()))
1739 { err = "adapter requires argument of type java.lang.Class"; break; }
1740 if (ek == _adapter_collect_args ||
1741 ek == _adapter_spread_args) {
1742 // Make sure it is a suitable collection type. (Array, for now.)
1743 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument()));
1744 if (!ak->oop_is_objArray()) {
1745 { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; }
1746 }
1747 }
1748 break;
1749 case _adapter_flyby:
1750 case _adapter_ricochet:
1751 if (!java_dyn_MethodHandle::is_instance(argument()))
1752 { err = "MethodHandle adapter argument required"; break; }
1753 break;
1754 default:
1755 if (argument.not_null())
1756 { err = "adapter has spurious argument"; break; }
1757 break;
1758 }
1759 }
1761 if (err == NULL) {
1762 // Check that the src/dest types are supplied if needed.
1763 switch (ek) {
1764 case _adapter_check_cast:
1765 if (src != T_OBJECT || dest != T_OBJECT) {
1766 err = "adapter requires object src/dest conversion subfields";
1767 }
1768 break;
1769 case _adapter_prim_to_prim:
1770 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) {
1771 err = "adapter requires primitive src/dest conversion subfields"; break;
1772 }
1773 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) ||
1774 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) {
1775 err = "adapter cannot convert beween floating and fixed-point"; break;
1776 }
1777 break;
1778 case _adapter_ref_to_prim:
1779 if (src != T_OBJECT || !is_java_primitive(dest)
1780 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) {
1781 err = "adapter requires primitive dest conversion subfield"; break;
1782 }
1783 break;
1784 case _adapter_prim_to_ref:
1785 if (!is_java_primitive(src) || dest != T_OBJECT
1786 || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) {
1787 err = "adapter requires primitive src conversion subfield"; break;
1788 }
1789 break;
1790 case _adapter_swap_args:
1791 case _adapter_rot_args:
1792 {
1793 if (!src || src != dest) {
1794 err = "adapter requires src/dest conversion subfields for swap"; break;
1795 }
1796 int swap_size = type2size[src];
1797 oop src_mtype = sun_dyn_AdapterMethodHandle::type(mh());
1798 oop dest_mtype = sun_dyn_AdapterMethodHandle::type(target());
1799 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(target());
1800 int src_slot = argslot;
1801 int dest_slot = vminfo;
1802 bool rotate_up = (src_slot > dest_slot); // upward rotation
1803 int src_arg = argnum;
1804 int dest_arg = argument_slot_to_argnum(dest_mtype, dest_slot);
1805 verify_vmargslot(mh, dest_arg, dest_slot, CHECK);
1806 if (!(dest_slot >= src_slot + swap_size) &&
1807 !(src_slot >= dest_slot + swap_size)) {
1808 err = "source, destination slots must be distinct";
1809 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) {
1810 err = "source of swap must be deeper in stack";
1811 } else if (ek == _adapter_swap_args) {
1812 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, dest_arg),
1813 java_dyn_MethodType::ptype(dest_mtype, src_arg),
1814 dest_arg);
1815 } else if (ek == _adapter_rot_args) {
1816 if (rotate_up) {
1817 assert((src_slot > dest_slot) && (src_arg < dest_arg), "");
1818 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot]
1819 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1]
1820 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) {
1821 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i),
1822 java_dyn_MethodType::ptype(dest_mtype, i-1),
1823 i);
1824 }
1825 } else { // rotate down
1826 assert((src_slot < dest_slot) && (src_arg > dest_arg), "");
1827 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss]
1828 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg]
1829 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) {
1830 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i),
1831 java_dyn_MethodType::ptype(dest_mtype, i+1),
1832 i);
1833 }
1834 }
1835 }
1836 if (err == NULL)
1837 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, src_arg),
1838 java_dyn_MethodType::ptype(dest_mtype, dest_arg),
1839 src_arg);
1840 }
1841 break;
1842 case _adapter_collect_args:
1843 case _adapter_spread_args:
1844 {
1845 BasicType coll_type = (ek == _adapter_collect_args) ? dest : src;
1846 BasicType elem_type = (ek == _adapter_collect_args) ? src : dest;
1847 if (coll_type != T_OBJECT || elem_type != T_OBJECT) {
1848 err = "adapter requires src/dest subfields"; break;
1849 // later:
1850 // - consider making coll be a primitive array
1851 // - consider making coll be a heterogeneous collection
1852 }
1853 }
1854 break;
1855 default:
1856 if (src != 0 || dest != 0) {
1857 err = "adapter has spurious src/dest conversion subfields"; break;
1858 }
1859 break;
1860 }
1861 }
1863 if (err == NULL) {
1864 // Check the stack_move subfield.
1865 // It must always report the net change in stack size, positive or negative.
1866 int slots_pushed = stack_move / stack_move_unit();
1867 switch (ek) {
1868 case _adapter_prim_to_prim:
1869 case _adapter_ref_to_prim:
1870 case _adapter_prim_to_ref:
1871 if (slots_pushed != type2size[dest] - type2size[src]) {
1872 err = "wrong stack motion for primitive conversion";
1873 }
1874 break;
1875 case _adapter_dup_args:
1876 if (slots_pushed <= 0) {
1877 err = "adapter requires conversion subfield slots_pushed > 0";
1878 }
1879 break;
1880 case _adapter_drop_args:
1881 if (slots_pushed >= 0) {
1882 err = "adapter requires conversion subfield slots_pushed < 0";
1883 }
1884 break;
1885 case _adapter_collect_args:
1886 if (slots_pushed > 1) {
1887 err = "adapter requires conversion subfield slots_pushed <= 1";
1888 }
1889 break;
1890 case _adapter_spread_args:
1891 if (slots_pushed < -1) {
1892 err = "adapter requires conversion subfield slots_pushed >= -1";
1893 }
1894 break;
1895 default:
1896 if (stack_move != 0) {
1897 err = "adapter has spurious stack_move conversion subfield";
1898 }
1899 break;
1900 }
1901 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) {
1902 err = "stack_move conversion subfield must be multiple of stack_move_unit";
1903 }
1904 }
1906 if (err == NULL) {
1907 // Make sure this adapter does not push too deeply.
1908 int slots_pushed = stack_move / stack_move_unit();
1909 int this_vmslots = java_dyn_MethodHandle::vmslots(mh());
1910 int target_vmslots = java_dyn_MethodHandle::vmslots(target());
1911 if (slots_pushed != (target_vmslots - this_vmslots)) {
1912 err = "stack_move inconsistent with previous and current MethodType vmslots";
1913 } else if (slots_pushed > 0) {
1914 // verify stack_move against MethodHandlePushLimit
1915 int target_pushes = decode_MethodHandle_stack_pushes(target());
1916 // do not blow the stack; use a Java-based adapter if this limit is exceeded
1917 if (slots_pushed + target_pushes > MethodHandlePushLimit) {
1918 err = "adapter pushes too many parameters";
1919 }
1920 }
1922 // While we're at it, check that the stack motion decoder works:
1923 DEBUG_ONLY(int target_pushes = decode_MethodHandle_stack_pushes(target()));
1924 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1925 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct");
1926 }
1928 if (err == NULL && vminfo != 0) {
1929 switch (ek) {
1930 case _adapter_swap_args:
1931 case _adapter_rot_args:
1932 break; // OK
1933 default:
1934 err = "vminfo subfield is reserved to the JVM";
1935 }
1936 }
1938 // Do additional ad hoc checks.
1939 if (err == NULL) {
1940 switch (ek) {
1941 case _adapter_retype_only:
1942 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false);
1943 break;
1945 case _adapter_retype_raw:
1946 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true);
1947 break;
1949 case _adapter_check_cast:
1950 {
1951 // The actual value being checked must be a reference:
1952 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype(), argnum),
1953 object_java_mirror(), argnum);
1954 if (err != NULL) break;
1956 // The output of the cast must fit with the destination argument:
1957 Handle cast_class = argument;
1958 err = check_method_type_conversion(src_mtype(),
1959 argnum, cast_class(),
1960 dst_mtype());
1961 }
1962 break;
1964 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles
1965 }
1966 }
1968 if (err != NULL) {
1969 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
1970 return;
1971 }
1973 }
1975 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
1976 oop argument = sun_dyn_AdapterMethodHandle::argument(mh());
1977 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh());
1978 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh());
1979 jint conv_op = adapter_conversion_op(conversion);
1981 // adjust the adapter code to the internal EntryKind enumeration:
1982 EntryKind ek_orig = adapter_entry_kind(conv_op);
1983 EntryKind ek_opt = ek_orig; // may be optimized
1985 // Finalize the vmtarget field (Java initialized it to null).
1986 if (!java_dyn_MethodHandle::is_instance(target())) {
1987 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD);
1988 return;
1989 }
1990 sun_dyn_AdapterMethodHandle::set_vmtarget(mh(), target());
1992 if (VerifyMethodHandles) {
1993 verify_AdapterMethodHandle(mh, argnum, CHECK);
1994 }
1996 int stack_move = adapter_conversion_stack_move(conversion);
1997 BasicType src = adapter_conversion_src_type(conversion);
1998 BasicType dest = adapter_conversion_dest_type(conversion);
1999 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
2001 const char* err = NULL;
2003 // Now it's time to finish the case analysis and pick a MethodHandleEntry.
2004 switch (ek_orig) {
2005 case _adapter_retype_only:
2006 case _adapter_retype_raw:
2007 case _adapter_check_cast:
2008 case _adapter_dup_args:
2009 case _adapter_drop_args:
2010 // these work fine via general case code
2011 break;
2013 case _adapter_prim_to_prim:
2014 {
2015 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}.
2016 // And, the {float,double} -> {int,long} cases must be handled by Java.
2017 switch (type2size[src] *4+ type2size[dest]) {
2018 case 1 *4+ 1:
2019 assert(src == T_INT || is_subword_type(src), "source is not float");
2020 // Subword-related cases are int -> {boolean,byte,char,short}.
2021 ek_opt = _adapter_opt_i2i;
2022 vminfo = adapter_subword_vminfo(dest);
2023 break;
2024 case 2 *4+ 1:
2025 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) {
2026 ek_opt = _adapter_opt_l2i;
2027 vminfo = adapter_subword_vminfo(dest);
2028 } else if (src == T_DOUBLE && dest == T_FLOAT) {
2029 ek_opt = _adapter_opt_d2f;
2030 } else {
2031 assert(false, "");
2032 }
2033 break;
2034 case 1 *4+ 2:
2035 if (src == T_INT && dest == T_LONG) {
2036 ek_opt = _adapter_opt_i2l;
2037 } else if (src == T_FLOAT && dest == T_DOUBLE) {
2038 ek_opt = _adapter_opt_f2d;
2039 } else {
2040 assert(false, "");
2041 }
2042 break;
2043 default:
2044 assert(false, "");
2045 break;
2046 }
2047 }
2048 break;
2050 case _adapter_ref_to_prim:
2051 {
2052 switch (type2size[dest]) {
2053 case 1:
2054 ek_opt = _adapter_opt_unboxi;
2055 vminfo = adapter_subword_vminfo(dest);
2056 break;
2057 case 2:
2058 ek_opt = _adapter_opt_unboxl;
2059 break;
2060 default:
2061 assert(false, "");
2062 break;
2063 }
2064 }
2065 break;
2067 case _adapter_prim_to_ref:
2068 goto throw_not_impl; // allocates, hence could block
2070 case _adapter_swap_args:
2071 case _adapter_rot_args:
2072 {
2073 int swap_slots = type2size[src];
2074 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(mh());
2075 int src_slot = argslot;
2076 int dest_slot = vminfo;
2077 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1;
2078 switch (swap_slots) {
2079 case 1:
2080 ek_opt = (!rotate ? _adapter_opt_swap_1 :
2081 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down);
2082 break;
2083 case 2:
2084 ek_opt = (!rotate ? _adapter_opt_swap_2 :
2085 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down);
2086 break;
2087 default:
2088 assert(false, "");
2089 break;
2090 }
2091 }
2092 break;
2094 case _adapter_collect_args:
2095 goto throw_not_impl; // allocates, hence could block
2097 case _adapter_spread_args:
2098 {
2099 // vminfo will be the required length of the array
2100 int slots_pushed = stack_move / stack_move_unit();
2101 int array_size = slots_pushed + 1;
2102 assert(array_size >= 0, "");
2103 vminfo = array_size;
2104 switch (array_size) {
2105 case 0: ek_opt = _adapter_opt_spread_0; break;
2106 case 1: ek_opt = _adapter_opt_spread_1; break;
2107 default: ek_opt = _adapter_opt_spread_more; break;
2108 }
2109 if ((vminfo & CONV_VMINFO_MASK) != vminfo)
2110 goto throw_not_impl; // overflow
2111 }
2112 break;
2114 case _adapter_flyby:
2115 case _adapter_ricochet:
2116 goto throw_not_impl; // runs Java code, hence could block
2118 default:
2119 // should have failed much earlier; must be a missing case here
2120 assert(false, "incomplete switch");
2121 // and fall through:
2123 throw_not_impl:
2124 // FIXME: these adapters are NYI
2125 err = "adapter not yet implemented in the JVM";
2126 break;
2127 }
2129 if (err != NULL) {
2130 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
2131 return;
2132 }
2134 // Rebuild the conversion value; maybe parts of it were changed.
2135 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo);
2137 // Finalize the conversion field. (Note that it is final to Java code.)
2138 sun_dyn_AdapterMethodHandle::set_conversion(mh(), new_conversion);
2140 // Done!
2141 java_dyn_MethodHandle::set_vmentry(mh(), entry(ek_opt));
2143 // There should be enough memory barriers on exit from native methods
2144 // to ensure that the MH is fully initialized to all threads before
2145 // Java code can publish it in global data structures.
2146 }
2148 //
2149 // Here are the native methods on sun.dyn.MethodHandleImpl.
2150 // They are the private interface between this JVM and the HotSpot-specific
2151 // Java code that implements JSR 292 method handles.
2152 //
2153 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
2154 // that intrinsic (non-JNI) native methods are defined in HotSpot.
2155 //
2157 // direct method handles for invokestatic or invokespecial
2158 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller);
2159 JVM_ENTRY(void, MHI_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2160 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) {
2161 ResourceMark rm; // for error messages
2163 // This is the guy we are initializing:
2164 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2165 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2167 // Early returns out of this method leave the DMH in an unfinished state.
2168 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2170 // which method are we really talking about?
2171 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2172 oop target_oop = JNIHandles::resolve_non_null(target_jh);
2173 if (sun_dyn_MemberName::is_instance(target_oop) &&
2174 sun_dyn_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) {
2175 Handle mname(THREAD, target_oop);
2176 MethodHandles::resolve_MemberName(mname, CHECK);
2177 target_oop = mname(); // in case of GC
2178 }
2180 int decode_flags = 0; klassOop receiver_limit = NULL;
2181 methodHandle m(THREAD,
2182 MethodHandles::decode_method(target_oop,
2183 receiver_limit, decode_flags));
2184 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); }
2186 // The trusted Java code that calls this method should already have performed
2187 // access checks on behalf of the given caller. But, we can verify this.
2188 if (VerifyMethodHandles && caller_jh != NULL) {
2189 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)));
2190 // If this were a bytecode, the first access check would be against
2191 // the "reference class" mentioned in the CONSTANT_Methodref.
2192 // We don't know at this point which class that was, and if we
2193 // check against m.method_holder we might get the wrong answer.
2194 // So we just make sure to handle this check when the resolution
2195 // happens, when we call resolve_MemberName.
2196 //
2197 // (A public class can inherit public members from private supers,
2198 // and it would be wrong to check access against the private super
2199 // if the original symbolic reference was against the public class.)
2200 //
2201 // If there were a bytecode, the next step would be to lookup the method
2202 // in the reference class, then then check the method's access bits.
2203 // Emulate LinkResolver::check_method_accessability.
2204 klassOop resolved_klass = m->method_holder();
2205 if (!Reflection::verify_field_access(caller->as_klassOop(),
2206 resolved_klass, resolved_klass,
2207 m->access_flags(),
2208 true)) {
2209 // %%% following cutout belongs in Reflection::verify_field_access?
2210 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(),
2211 resolved_klass, THREAD);
2212 if (!same_pm) {
2213 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string());
2214 }
2215 }
2216 }
2218 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK);
2219 }
2220 JVM_END
2222 // bound method handles
2223 JVM_ENTRY(void, MHI_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2224 jobject target_jh, int argnum)) {
2225 ResourceMark rm; // for error messages
2227 // This is the guy we are initializing:
2228 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2229 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2231 // Early returns out of this method leave the BMH in an unfinished state.
2232 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2234 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2235 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2237 if (!java_dyn_MethodHandle::is_instance(target())) {
2238 // Target object is a reflective method. (%%% Do we need this alternate path?)
2239 Untested("init_BMH of non-MH");
2240 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); }
2241 int decode_flags = 0; klassOop receiver_limit_oop = NULL;
2242 methodHandle m(THREAD,
2243 MethodHandles::decode_method(target(),
2244 receiver_limit_oop,
2245 decode_flags));
2246 KlassHandle receiver_limit(THREAD, receiver_limit_oop);
2247 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m,
2248 receiver_limit,
2249 decode_flags,
2250 CHECK);
2251 return;
2252 }
2254 // Build a BMH on top of a DMH or another BMH:
2255 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK);
2256 }
2257 JVM_END
2259 // adapter method handles
2260 JVM_ENTRY(void, MHI_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2261 jobject target_jh, int argnum)) {
2262 // This is the guy we are initializing:
2263 if (mh_jh == NULL || target_jh == NULL) {
2264 THROW(vmSymbols::java_lang_InternalError());
2265 }
2266 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2267 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2269 // Early returns out of this method leave the AMH in an unfinished state.
2270 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2272 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK);
2273 }
2274 JVM_END
2276 // method type forms
2277 JVM_ENTRY(void, MHI_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) {
2278 if (erased_jh == NULL) return;
2279 if (TraceMethodHandles) {
2280 tty->print("creating MethodType form ");
2281 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH!
2282 // call Object.toString()
2283 symbolOop name = vmSymbols::toString_name(), sig = vmSymbols::void_string_signature();
2284 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh)));
2285 JavaValue result(T_OBJECT);
2286 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig,
2287 &args, CHECK);
2288 Handle str(THREAD, (oop)result.get_jobject());
2289 java_lang_String::print(str, tty);
2290 }
2291 tty->cr();
2292 }
2293 }
2294 JVM_END
2296 // debugging and reflection
2297 JVM_ENTRY(jobject, MHI_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) {
2298 Handle mh(THREAD, JNIHandles::resolve(mh_jh));
2299 if (!java_dyn_MethodHandle::is_instance(mh())) {
2300 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
2301 }
2302 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL);
2303 return JNIHandles::make_local(THREAD, target);
2304 }
2305 JVM_END
2307 JVM_ENTRY(jint, MHI_getConstant(JNIEnv *env, jobject igcls, jint which)) {
2308 switch (which) {
2309 case MethodHandles::GC_JVM_PUSH_LIMIT:
2310 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF,
2311 "MethodHandlePushLimit parameter must be in valid range");
2312 return MethodHandlePushLimit;
2313 case MethodHandles::GC_JVM_STACK_MOVE_UNIT:
2314 // return number of words per slot, signed according to stack direction
2315 return MethodHandles::stack_move_unit();
2316 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK:
2317 return MethodHandles::adapter_conversion_ops_supported_mask();
2318 }
2319 return 0;
2320 }
2321 JVM_END
2323 #ifndef PRODUCT
2324 #define EACH_NAMED_CON(template) \
2325 template(MethodHandles,GC_JVM_PUSH_LIMIT) \
2326 template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) \
2327 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \
2328 template(MethodHandles,ETF_DIRECT_HANDLE) \
2329 template(MethodHandles,ETF_METHOD_NAME) \
2330 template(MethodHandles,ETF_REFLECT_METHOD) \
2331 template(sun_dyn_MemberName,MN_IS_METHOD) \
2332 template(sun_dyn_MemberName,MN_IS_CONSTRUCTOR) \
2333 template(sun_dyn_MemberName,MN_IS_FIELD) \
2334 template(sun_dyn_MemberName,MN_IS_TYPE) \
2335 template(sun_dyn_MemberName,MN_SEARCH_SUPERCLASSES) \
2336 template(sun_dyn_MemberName,MN_SEARCH_INTERFACES) \
2337 template(sun_dyn_MemberName,VM_INDEX_UNINITIALIZED) \
2338 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_ONLY) \
2339 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_RAW) \
2340 template(sun_dyn_AdapterMethodHandle,OP_CHECK_CAST) \
2341 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_PRIM) \
2342 template(sun_dyn_AdapterMethodHandle,OP_REF_TO_PRIM) \
2343 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_REF) \
2344 template(sun_dyn_AdapterMethodHandle,OP_SWAP_ARGS) \
2345 template(sun_dyn_AdapterMethodHandle,OP_ROT_ARGS) \
2346 template(sun_dyn_AdapterMethodHandle,OP_DUP_ARGS) \
2347 template(sun_dyn_AdapterMethodHandle,OP_DROP_ARGS) \
2348 template(sun_dyn_AdapterMethodHandle,OP_COLLECT_ARGS) \
2349 template(sun_dyn_AdapterMethodHandle,OP_SPREAD_ARGS) \
2350 template(sun_dyn_AdapterMethodHandle,OP_FLYBY) \
2351 template(sun_dyn_AdapterMethodHandle,OP_RICOCHET) \
2352 template(sun_dyn_AdapterMethodHandle,CONV_OP_LIMIT) \
2353 template(sun_dyn_AdapterMethodHandle,CONV_OP_MASK) \
2354 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_MASK) \
2355 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_SHIFT) \
2356 template(sun_dyn_AdapterMethodHandle,CONV_OP_SHIFT) \
2357 template(sun_dyn_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \
2358 template(sun_dyn_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \
2359 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \
2360 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \
2361 /*end*/
2363 #define ONE_PLUS(scope,value) 1+
2364 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0;
2365 #define VALUE_COMMA(scope,value) scope::value,
2366 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 };
2367 #define STRING_NULL(scope,value) #value "\0"
2368 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) };
2370 #undef ONE_PLUS
2371 #undef VALUE_COMMA
2372 #undef STRING_NULL
2373 #undef EACH_NAMED_CON
2374 #endif
2376 JVM_ENTRY(jint, MHI_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
2377 #ifndef PRODUCT
2378 if (which >= 0 && which < con_value_count) {
2379 int con = con_values[which];
2380 objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh);
2381 if (box != NULL && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
2382 const char* str = &con_names[0];
2383 for (int i = 0; i < which; i++)
2384 str += strlen(str) + 1; // skip name and null
2385 oop name = java_lang_String::create_oop_from_str(str, CHECK_0);
2386 box->obj_at_put(0, name);
2387 }
2388 return con;
2389 }
2390 #endif
2391 return 0;
2392 }
2393 JVM_END
2395 // void init(MemberName self, AccessibleObject ref)
2396 JVM_ENTRY(void, MHI_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
2397 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2398 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2399 oop target_oop = JNIHandles::resolve_non_null(target_jh);
2400 MethodHandles::init_MemberName(mname(), target_oop);
2401 }
2402 JVM_END
2404 // void expand(MemberName self)
2405 JVM_ENTRY(void, MHI_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
2406 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2407 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2408 MethodHandles::expand_MemberName(mname, 0, CHECK);
2409 }
2410 JVM_END
2412 // void resolve(MemberName self, Class<?> caller)
2413 JVM_ENTRY(void, MHI_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
2414 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2415 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2417 // The trusted Java code that calls this method should already have performed
2418 // access checks on behalf of the given caller. But, we can verify this.
2419 if (VerifyMethodHandles && caller_jh != NULL) {
2420 klassOop reference_klass = java_lang_Class::as_klassOop(sun_dyn_MemberName::clazz(mname()));
2421 if (reference_klass != NULL) {
2422 // Emulate LinkResolver::check_klass_accessability.
2423 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh));
2424 if (!Reflection::verify_class_access(caller,
2425 reference_klass,
2426 true)) {
2427 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name());
2428 }
2429 }
2430 }
2432 MethodHandles::resolve_MemberName(mname, CHECK);
2433 }
2434 JVM_END
2436 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
2437 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
2438 JVM_ENTRY(jint, MHI_getMembers(JNIEnv *env, jobject igcls,
2439 jclass clazz_jh, jstring name_jh, jstring sig_jh,
2440 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
2441 if (clazz_jh == NULL || results_jh == NULL) return -1;
2442 klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh));
2444 objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh);
2445 if (results == NULL || !results->is_objArray()) return -1;
2447 symbolOop name = NULL, sig = NULL;
2448 if (name_jh != NULL) {
2449 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
2450 if (name == NULL) return 0; // a match is not possible
2451 }
2452 if (sig_jh != NULL) {
2453 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
2454 if (sig == NULL) return 0; // a match is not possible
2455 }
2457 klassOop caller = NULL;
2458 if (caller_jh != NULL) {
2459 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
2460 if (!java_lang_Class::is_instance(caller_oop)) return -1;
2461 caller = java_lang_Class::as_klassOop(caller_oop);
2462 }
2464 if (name != NULL && sig != NULL && results != NULL) {
2465 // try a direct resolve
2466 // %%% TO DO
2467 }
2469 int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags,
2470 caller, skip, results);
2471 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
2472 return res;
2473 }
2474 JVM_END
2476 JVM_ENTRY(void, MHI_registerBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh, jobject bsm_jh)) {
2477 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD);
2478 ik->link_class(CHECK);
2479 if (!java_dyn_MethodHandle::is_instance(JNIHandles::resolve(bsm_jh))) {
2480 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "method handle");
2481 }
2482 const char* err = NULL;
2483 if (ik->is_initialized() || ik->is_in_error_state()) {
2484 err = "too late: class is already initialized";
2485 } else {
2486 ObjectLocker ol(ik, THREAD); // note: this should be a recursive lock
2487 if (ik->is_not_initialized() ||
2488 (ik->is_being_initialized() && ik->is_reentrant_initialization(THREAD))) {
2489 if (ik->bootstrap_method() != NULL) {
2490 err = "class is already equipped with a bootstrap method";
2491 } else {
2492 ik->set_bootstrap_method(JNIHandles::resolve_non_null(bsm_jh));
2493 err = NULL;
2494 }
2495 } else {
2496 err = "class is already initialized";
2497 if (ik->is_being_initialized())
2498 err = "class is already being initialized in a different thread";
2499 }
2500 }
2501 if (err != NULL) {
2502 THROW_MSG(vmSymbols::java_lang_IllegalStateException(), err);
2503 }
2504 }
2505 JVM_END
2507 JVM_ENTRY(jobject, MHI_getBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh)) {
2508 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD);
2509 return JNIHandles::make_local(THREAD, ik->bootstrap_method());
2510 }
2511 JVM_END
2513 JVM_ENTRY(void, MHI_setCallSiteTarget(JNIEnv *env, jobject igcls, jobject site_jh, jobject target_jh)) {
2514 // No special action required, yet.
2515 oop site_oop = JNIHandles::resolve(site_jh);
2516 if (!java_dyn_CallSite::is_instance(site_oop))
2517 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "not a CallSite");
2518 java_dyn_CallSite::set_target(site_oop, JNIHandles::resolve(target_jh));
2519 }
2520 JVM_END
2523 /// JVM_RegisterMethodHandleMethods
2525 #define ADR "J"
2527 #define LANG "Ljava/lang/"
2528 #define JDYN "Ljava/dyn/"
2529 #define IDYN "Lsun/dyn/"
2531 #define OBJ LANG"Object;"
2532 #define CLS LANG"Class;"
2533 #define STRG LANG"String;"
2534 #define CST JDYN"CallSite;"
2535 #define MT JDYN"MethodType;"
2536 #define MH JDYN"MethodHandle;"
2537 #define MHI IDYN"MethodHandleImpl;"
2538 #define MEM IDYN"MemberName;"
2539 #define AMH IDYN"AdapterMethodHandle;"
2540 #define BMH IDYN"BoundMethodHandle;"
2541 #define DMH IDYN"DirectMethodHandle;"
2543 #define CC (char*) /*cast a literal from (const char*)*/
2544 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
2546 // These are the native methods on sun.dyn.MethodHandleNatives.
2547 static JNINativeMethod methods[] = {
2548 // void init(MemberName self, AccessibleObject ref)
2549 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHI_init_AMH)},
2550 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHI_init_BMH)},
2551 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHI_init_DMH)},
2552 {CC"init", CC"("MT")V", FN_PTR(MHI_init_MT)},
2553 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHI_init_Mem)},
2554 {CC"expand", CC"("MEM")V", FN_PTR(MHI_expand_Mem)},
2555 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHI_resolve_Mem)},
2556 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHI_getTarget)},
2557 {CC"getConstant", CC"(I)I", FN_PTR(MHI_getConstant)},
2558 // static native int getNamedCon(int which, Object[] name)
2559 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHI_getNamedCon)},
2560 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
2561 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
2562 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHI_getMembers)}
2563 };
2565 // More entry points specifically for EnableInvokeDynamic.
2566 static JNINativeMethod methods2[] = {
2567 {CC"registerBootstrap", CC"("CLS MH")V", FN_PTR(MHI_registerBootstrap)},
2568 {CC"getBootstrap", CC"("CLS")"MH, FN_PTR(MHI_getBootstrap)},
2569 {CC"setCallSiteTarget", CC"("CST MH")V", FN_PTR(MHI_setCallSiteTarget)}
2570 };
2573 // This one function is exported, used by NativeLookup.
2575 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
2576 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK");
2578 // note: this explicit warning-producing stuff will be replaced by auto-detection of the JSR 292 classes
2580 if (!EnableMethodHandles) {
2581 warning("JSR 292 method handles are disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableMethodHandles to enable.");
2582 return; // bind nothing
2583 }
2585 bool enable_MH = true;
2587 {
2588 ThreadToNativeFromVM ttnfv(thread);
2590 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod));
2591 if (env->ExceptionOccurred()) {
2592 MethodHandles::set_enabled(false);
2593 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
2594 enable_MH = false;
2595 env->ExceptionClear();
2596 }
2597 }
2599 if (enable_MH) {
2600 KlassHandle MHI_klass = SystemDictionaryHandles::MethodHandleImpl_klass();
2601 if (MHI_klass.not_null()) {
2602 symbolHandle raiseException_name = oopFactory::new_symbol_handle("raiseException", CHECK);
2603 symbolHandle raiseException_sig = oopFactory::new_symbol_handle("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK);
2604 methodOop raiseException_method = instanceKlass::cast(MHI_klass->as_klassOop())
2605 ->find_method(raiseException_name(), raiseException_sig());
2606 if (raiseException_method != NULL && raiseException_method->is_static()) {
2607 MethodHandles::set_raise_exception_method(raiseException_method);
2608 } else {
2609 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
2610 enable_MH = false;
2611 }
2612 }
2613 }
2615 if (enable_MH) {
2616 MethodHandles::set_enabled(true);
2617 }
2619 if (!EnableInvokeDynamic) {
2620 warning("JSR 292 invokedynamic is disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableInvokeDynamic to enable.");
2621 return; // bind nothing
2622 }
2624 {
2625 ThreadToNativeFromVM ttnfv(thread);
2627 int status = env->RegisterNatives(MHN_class, methods2, sizeof(methods2)/sizeof(JNINativeMethod));
2628 if (env->ExceptionOccurred()) {
2629 MethodHandles::set_enabled(false);
2630 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
2631 env->ExceptionClear();
2632 } else {
2633 MethodHandles::set_enabled(true);
2634 }
2635 }
2636 }
2637 JVM_END