Mon, 18 Apr 2011 01:33:28 -0700
7018355: JSR 292: VM crash in DefNewGeneration::copy_to_survivor_space
Reviewed-by: kvn, jrose
1 /*
2 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "interpreter/interpreter.hpp"
28 #include "memory/allocation.inline.hpp"
29 #include "memory/oopFactory.hpp"
30 #include "prims/methodHandles.hpp"
31 #include "runtime/javaCalls.hpp"
32 #include "runtime/reflection.hpp"
33 #include "runtime/signature.hpp"
34 #include "runtime/stubRoutines.hpp"
36 /*
37 * JSR 292 reference implementation: method handles
38 */
40 bool MethodHandles::_enabled = false; // set true after successful native linkage
42 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL};
43 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = {
44 "raise_exception",
45 "invokestatic", // how a MH emulates invokestatic
46 "invokespecial", // ditto for the other invokes...
47 "invokevirtual",
48 "invokeinterface",
49 "bound_ref", // these are for BMH...
50 "bound_int",
51 "bound_long",
52 "bound_ref_direct", // (direct versions have a direct methodOop)
53 "bound_int_direct",
54 "bound_long_direct",
56 // starting at _adapter_mh_first:
57 "adapter_retype_only", // these are for AMH...
58 "adapter_retype_raw",
59 "adapter_check_cast",
60 "adapter_prim_to_prim",
61 "adapter_ref_to_prim",
62 "adapter_prim_to_ref",
63 "adapter_swap_args",
64 "adapter_rot_args",
65 "adapter_dup_args",
66 "adapter_drop_args",
67 "adapter_collect_args",
68 "adapter_spread_args",
69 "adapter_flyby",
70 "adapter_ricochet",
72 // optimized adapter types:
73 "adapter_swap_args/1",
74 "adapter_swap_args/2",
75 "adapter_rot_args/1,up",
76 "adapter_rot_args/1,down",
77 "adapter_rot_args/2,up",
78 "adapter_rot_args/2,down",
79 "adapter_prim_to_prim/i2i",
80 "adapter_prim_to_prim/l2i",
81 "adapter_prim_to_prim/d2f",
82 "adapter_prim_to_prim/i2l",
83 "adapter_prim_to_prim/f2d",
84 "adapter_ref_to_prim/unboxi",
85 "adapter_ref_to_prim/unboxl",
86 "adapter_spread_args/0",
87 "adapter_spread_args/1",
88 "adapter_spread_args/more",
90 NULL
91 };
93 // Adapters.
94 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
95 int MethodHandles::_adapter_code_size = StubRoutines::method_handles_adapters_code_size;
97 jobject MethodHandles::_raise_exception_method;
99 #ifdef ASSERT
100 bool MethodHandles::spot_check_entry_names() {
101 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), "");
102 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), "");
103 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), "");
104 assert(!strcmp(entry_name(_adapter_ricochet), "adapter_ricochet"), "");
105 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), "");
106 return true;
107 }
108 #endif
111 //------------------------------------------------------------------------------
112 // MethodHandles::generate_adapters
113 //
114 void MethodHandles::generate_adapters() {
115 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
117 assert(_adapter_code == NULL, "generate only once");
119 ResourceMark rm;
120 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
121 _adapter_code = MethodHandlesAdapterBlob::create(_adapter_code_size);
122 if (_adapter_code == NULL)
123 vm_exit_out_of_memory(_adapter_code_size, "CodeCache: no room for MethodHandles adapters");
124 CodeBuffer code(_adapter_code);
125 MethodHandlesAdapterGenerator g(&code);
126 g.generate();
127 }
130 //------------------------------------------------------------------------------
131 // MethodHandlesAdapterGenerator::generate
132 //
133 void MethodHandlesAdapterGenerator::generate() {
134 // Generate generic method handle adapters.
135 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST;
136 ek < MethodHandles::_EK_LIMIT;
137 ek = MethodHandles::EntryKind(1 + (int)ek)) {
138 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek));
139 MethodHandles::generate_method_handle_stub(_masm, ek);
140 }
141 }
144 void MethodHandles::set_enabled(bool z) {
145 if (_enabled != z) {
146 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
147 _enabled = z;
148 }
149 }
151 // Note: A method which does not have a TRAPS argument cannot block in the GC
152 // or throw exceptions. Such methods are used in this file to do something quick
153 // and local, like parse a data structure. For speed, such methods work on plain
154 // oops, not handles. Trapping methods uniformly operate on handles.
156 methodHandle MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype,
157 KlassHandle& receiver_limit_result, int& decode_flags_result) {
158 if (vmtarget == NULL) return methodHandle();
159 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding");
160 if (vmindex < 0) {
161 // this DMH performs no dispatch; it is directly bound to a methodOop
162 // A MemberName may either be directly bound to a methodOop,
163 // or it may use the klass/index form; both forms mean the same thing.
164 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result);
165 if ((decode_flags_result & _dmf_has_receiver) != 0
166 && java_lang_invoke_MethodType::is_instance(mtype)) {
167 // Extract receiver type restriction from mtype.ptypes[0].
168 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype);
169 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0);
170 if (java_lang_Class::is_instance(ptype0))
171 receiver_limit_result = java_lang_Class::as_klassOop(ptype0);
172 }
173 if (vmindex == methodOopDesc::nonvirtual_vtable_index) {
174 // this DMH can be an "invokespecial" version
175 decode_flags_result &= ~_dmf_does_dispatch;
176 } else {
177 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?");
178 }
179 return m;
180 } else {
181 assert(vmtarget->is_klass(), "must be class or interface");
182 decode_flags_result |= MethodHandles::_dmf_does_dispatch;
183 decode_flags_result |= MethodHandles::_dmf_has_receiver;
184 receiver_limit_result = (klassOop)vmtarget;
185 Klass* tk = Klass::cast((klassOop)vmtarget);
186 if (tk->is_interface()) {
187 // an itable linkage is <interface, itable index>
188 decode_flags_result |= MethodHandles::_dmf_from_interface;
189 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex);
190 } else {
191 if (!tk->oop_is_instance())
192 tk = instanceKlass::cast(SystemDictionary::Object_klass());
193 return ((instanceKlass*)tk)->method_at_vtable(vmindex);
194 }
195 }
196 }
198 // MemberName and DirectMethodHandle have the same linkage to the JVM internals.
199 // (MemberName is the non-operational name used for queries and setup.)
201 methodHandle MethodHandles::decode_DirectMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
202 oop vmtarget = java_lang_invoke_DirectMethodHandle::vmtarget(mh);
203 int vmindex = java_lang_invoke_DirectMethodHandle::vmindex(mh);
204 oop mtype = java_lang_invoke_DirectMethodHandle::type(mh);
205 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result);
206 }
208 methodHandle MethodHandles::decode_BoundMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
209 assert(java_lang_invoke_BoundMethodHandle::is_instance(mh), "");
210 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), "");
211 for (oop bmh = mh;;) {
212 // Bound MHs can be stacked to bind several arguments.
213 oop target = java_lang_invoke_MethodHandle::vmtarget(bmh);
214 if (target == NULL) return methodHandle();
215 decode_flags_result |= MethodHandles::_dmf_binds_argument;
216 klassOop tk = target->klass();
217 if (tk == SystemDictionary::BoundMethodHandle_klass()) {
218 bmh = target;
219 continue;
220 } else {
221 if (java_lang_invoke_MethodHandle::is_subclass(tk)) {
222 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH");
223 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
224 } else {
225 // Optimized case: binding a receiver to a non-dispatched DMH
226 // short-circuits directly to the methodOop.
227 // (It might be another argument besides a receiver also.)
228 assert(target->is_method(), "must be a simple method");
229 decode_flags_result |= MethodHandles::_dmf_binds_method;
230 methodOop m = (methodOop) target;
231 if (!m->is_static())
232 decode_flags_result |= MethodHandles::_dmf_has_receiver;
233 return m;
234 }
235 }
236 }
237 }
239 methodHandle MethodHandles::decode_AdapterMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
240 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), "");
241 for (oop amh = mh;;) {
242 // Adapter MHs can be stacked to convert several arguments.
243 int conv_op = adapter_conversion_op(java_lang_invoke_AdapterMethodHandle::conversion(amh));
244 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK;
245 oop target = java_lang_invoke_MethodHandle::vmtarget(amh);
246 if (target == NULL) return methodHandle();
247 klassOop tk = target->klass();
248 if (tk == SystemDictionary::AdapterMethodHandle_klass()) {
249 amh = target;
250 continue;
251 } else {
252 // must be a BMH (which will bind some more arguments) or a DMH (for the final call)
253 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
254 }
255 }
256 }
258 methodHandle MethodHandles::decode_MethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) {
259 if (mh == NULL) return methodHandle();
260 klassOop mhk = mh->klass();
261 assert(java_lang_invoke_MethodHandle::is_subclass(mhk), "must be a MethodHandle");
262 if (mhk == SystemDictionary::DirectMethodHandle_klass()) {
263 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result);
264 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) {
265 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
266 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) {
267 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result);
268 } else if (java_lang_invoke_BoundMethodHandle::is_subclass(mhk)) {
269 // could be a JavaMethodHandle (but not an adapter MH)
270 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
271 } else {
272 assert(false, "cannot parse this MH");
273 return methodHandle(); // random MH?
274 }
275 }
277 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) {
278 assert(m->is_method(), "");
279 if (m->is_static()) {
280 // check that signature begins '(L' or '([' (not '(I', '()', etc.)
281 Symbol* sig = m->signature();
282 BasicType recv_bt = char2type(sig->byte_at(1));
283 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')'
284 assert(sig->byte_at(0) == '(', "must be method sig");
285 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY)
286 // decode_flags_result |= _dmf_has_receiver;
287 } else {
288 // non-static method
289 decode_flags_result |= _dmf_has_receiver;
290 if (!m->can_be_statically_bound() && !m->is_initializer()) {
291 decode_flags_result |= _dmf_does_dispatch;
292 if (Klass::cast(m->method_holder())->is_interface())
293 decode_flags_result |= _dmf_from_interface;
294 }
295 }
296 return m;
297 }
300 // A trusted party is handing us a cookie to determine a method.
301 // Let's boil it down to the method oop they really want.
302 methodHandle MethodHandles::decode_method(oop x, KlassHandle& receiver_limit_result, int& decode_flags_result) {
303 decode_flags_result = 0;
304 receiver_limit_result = KlassHandle();
305 klassOop xk = x->klass();
306 if (xk == Universe::methodKlassObj()) {
307 return decode_methodOop((methodOop) x, decode_flags_result);
308 } else if (xk == SystemDictionary::MemberName_klass()) {
309 // Note: This only works if the MemberName has already been resolved.
310 return decode_MemberName(x, receiver_limit_result, decode_flags_result);
311 } else if (java_lang_invoke_MethodHandle::is_subclass(xk)) {
312 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result);
313 } else if (xk == SystemDictionary::reflect_Method_klass()) {
314 oop clazz = java_lang_reflect_Method::clazz(x);
315 int slot = java_lang_reflect_Method::slot(x);
316 klassOop k = java_lang_Class::as_klassOop(clazz);
317 if (k != NULL && Klass::cast(k)->oop_is_instance())
318 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
319 decode_flags_result);
320 } else if (xk == SystemDictionary::reflect_Constructor_klass()) {
321 oop clazz = java_lang_reflect_Constructor::clazz(x);
322 int slot = java_lang_reflect_Constructor::slot(x);
323 klassOop k = java_lang_Class::as_klassOop(clazz);
324 if (k != NULL && Klass::cast(k)->oop_is_instance())
325 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
326 decode_flags_result);
327 } else {
328 // unrecognized object
329 assert(!x->is_method(), "already checked");
330 assert(!java_lang_invoke_MemberName::is_instance(x), "already checked");
331 }
332 return methodHandle();
333 }
336 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) {
337 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass())
338 return 0; // no push/pop
339 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh);
340 int last_vmslots = 0;
341 oop last_mh = mh;
342 for (;;) {
343 oop target = java_lang_invoke_MethodHandle::vmtarget(last_mh);
344 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
345 last_vmslots = java_lang_invoke_MethodHandle::vmslots(target);
346 break;
347 } else if (!java_lang_invoke_MethodHandle::is_instance(target)) {
348 // might be klass or method
349 assert(target->is_method(), "must get here with a direct ref to method");
350 last_vmslots = methodOop(target)->size_of_parameters();
351 break;
352 }
353 last_mh = target;
354 }
355 // If I am called with fewer VM slots than my ultimate callee,
356 // it must be that I push the additionally needed slots.
357 // Likewise if am called with more VM slots, I will pop them.
358 return (last_vmslots - this_vmslots);
359 }
362 // MemberName support
364 // import java_lang_invoke_MemberName.*
365 enum {
366 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
367 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
368 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
369 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
370 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
371 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
372 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE,
373 VM_INDEX_UNINITIALIZED = java_lang_invoke_MemberName::VM_INDEX_UNINITIALIZED
374 };
376 Handle MethodHandles::new_MemberName(TRAPS) {
377 Handle empty;
378 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
379 if (!k->is_initialized()) k->initialize(CHECK_(empty));
380 return Handle(THREAD, k->allocate_instance(THREAD));
381 }
383 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) {
384 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) {
385 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
386 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
387 int mods = java_lang_reflect_Field::modifiers(target_oop);
388 klassOop k = java_lang_Class::as_klassOop(clazz);
389 int offset = instanceKlass::cast(k)->offset_from_fields(slot);
390 init_MemberName(mname_oop, k, accessFlags_from(mods), offset);
391 } else {
392 KlassHandle receiver_limit; int decode_flags = 0;
393 methodHandle m = MethodHandles::decode_method(target_oop, receiver_limit, decode_flags);
394 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
395 init_MemberName(mname_oop, m(), do_dispatch);
396 }
397 }
399 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) {
400 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD)
401 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ));
402 oop vmtarget = m;
403 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet
404 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound())
405 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch
406 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value");
407 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
408 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
409 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
410 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror());
411 }
413 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) {
414 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ));
415 oop vmtarget = field_holder;
416 int vmindex = offset; // determines the field uniquely when combined with static bit
417 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex");
418 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
419 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
420 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
421 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror());
422 }
425 methodHandle MethodHandles::decode_MemberName(oop mname, KlassHandle& receiver_limit_result, int& decode_flags_result) {
426 methodHandle empty;
427 int flags = java_lang_invoke_MemberName::flags(mname);
428 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return empty; // not invocable
429 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname);
430 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
431 if (vmindex == VM_INDEX_UNINITIALIZED) return empty; // not resolved
432 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result);
433 oop clazz = java_lang_invoke_MemberName::clazz(mname);
434 if (clazz != NULL && java_lang_Class::is_instance(clazz)) {
435 klassOop klass = java_lang_Class::as_klassOop(clazz);
436 if (klass != NULL) receiver_limit_result = klass;
437 }
438 return m;
439 }
441 // convert the external string or reflective type to an internal signature
442 Symbol* MethodHandles::convert_to_signature(oop type_str, bool polymorphic, TRAPS) {
443 if (java_lang_invoke_MethodType::is_instance(type_str)) {
444 return java_lang_invoke_MethodType::as_signature(type_str, polymorphic, CHECK_NULL);
445 } else if (java_lang_Class::is_instance(type_str)) {
446 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
447 } else if (java_lang_String::is_instance(type_str)) {
448 if (polymorphic) {
449 return java_lang_String::as_symbol(type_str, CHECK_NULL);
450 } else {
451 return java_lang_String::as_symbol_or_null(type_str);
452 }
453 } else {
454 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
455 }
456 }
458 // An unresolved member name is a mere symbolic reference.
459 // Resolving it plants a vmtarget/vmindex in it,
460 // which refers dirctly to JVM internals.
461 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
462 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
463 #ifdef ASSERT
464 // If this assert throws, renegotiate the sentinel value used by the Java code,
465 // so that it is distinct from any valid vtable index value, and any special
466 // values defined in methodOopDesc::VtableIndexFlag.
467 // The point of the slop is to give the Java code and the JVM some room
468 // to independently specify sentinel values.
469 const int sentinel_slop = 10;
470 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop;
471 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels");
472 #endif
473 if (java_lang_invoke_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED)
474 return; // already resolved
475 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
476 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
477 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
478 int flags = java_lang_invoke_MemberName::flags(mname());
480 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
481 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve");
482 }
484 instanceKlassHandle defc;
485 {
486 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop());
487 if (defc_klassOop == NULL) return; // a primitive; no resolution possible
488 if (!Klass::cast(defc_klassOop)->oop_is_instance()) {
489 if (!Klass::cast(defc_klassOop)->oop_is_array()) return;
490 defc_klassOop = SystemDictionary::Object_klass();
491 }
492 defc = instanceKlassHandle(THREAD, defc_klassOop);
493 }
494 if (defc.is_null()) {
495 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class");
496 }
497 defc->link_class(CHECK); // possible safepoint
499 // convert the external string name to an internal symbol
500 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
501 if (name == NULL) return; // no such name
503 Handle polymorphic_method_type;
504 bool polymorphic_signature = false;
505 if ((flags & ALL_KINDS) == IS_METHOD &&
506 (defc() == SystemDictionary::MethodHandle_klass() &&
507 methodOopDesc::is_method_handle_invoke_name(name))) {
508 polymorphic_signature = true;
509 }
511 // convert the external string or reflective type to an internal signature
512 TempNewSymbol type = convert_to_signature(type_str(), polymorphic_signature, CHECK);
513 if (java_lang_invoke_MethodType::is_instance(type_str()) && polymorphic_signature) {
514 polymorphic_method_type = type_str; // preserve exactly
515 }
516 if (type == NULL) return; // no such signature exists in the VM
518 // Time to do the lookup.
519 switch (flags & ALL_KINDS) {
520 case IS_METHOD:
521 {
522 CallInfo result;
523 {
524 EXCEPTION_MARK;
525 if ((flags & JVM_ACC_STATIC) != 0) {
526 LinkResolver::resolve_static_call(result,
527 defc, name, type, KlassHandle(), false, false, THREAD);
528 } else if (defc->is_interface()) {
529 LinkResolver::resolve_interface_call(result, Handle(), defc,
530 defc, name, type, KlassHandle(), false, false, THREAD);
531 } else {
532 LinkResolver::resolve_virtual_call(result, Handle(), defc,
533 defc, name, type, KlassHandle(), false, false, THREAD);
534 }
535 if (HAS_PENDING_EXCEPTION) {
536 CLEAR_PENDING_EXCEPTION;
537 break; // go to second chance
538 }
539 }
540 methodHandle m = result.resolved_method();
541 oop vmtarget = NULL;
542 int vmindex = methodOopDesc::nonvirtual_vtable_index;
543 if (defc->is_interface()) {
544 vmindex = klassItable::compute_itable_index(m());
545 assert(vmindex >= 0, "");
546 } else if (result.has_vtable_index()) {
547 vmindex = result.vtable_index();
548 assert(vmindex >= 0, "");
549 }
550 assert(vmindex != VM_INDEX_UNINITIALIZED, "");
551 if (vmindex < 0) {
552 assert(result.is_statically_bound(), "");
553 vmtarget = m();
554 } else {
555 vmtarget = result.resolved_klass()->as_klassOop();
556 }
557 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
558 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
559 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
560 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
561 DEBUG_ONLY(KlassHandle junk1; int junk2);
562 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(),
563 "properly stored for later decoding");
564 return;
565 }
566 case IS_CONSTRUCTOR:
567 {
568 CallInfo result;
569 {
570 EXCEPTION_MARK;
571 if (name == vmSymbols::object_initializer_name()) {
572 LinkResolver::resolve_special_call(result,
573 defc, name, type, KlassHandle(), false, THREAD);
574 } else {
575 break; // will throw after end of switch
576 }
577 if (HAS_PENDING_EXCEPTION) {
578 CLEAR_PENDING_EXCEPTION;
579 return;
580 }
581 }
582 assert(result.is_statically_bound(), "");
583 methodHandle m = result.resolved_method();
584 oop vmtarget = m();
585 int vmindex = methodOopDesc::nonvirtual_vtable_index;
586 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
587 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
588 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
589 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
590 DEBUG_ONLY(KlassHandle junk1; int junk2);
591 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(),
592 "properly stored for later decoding");
593 return;
594 }
595 case IS_FIELD:
596 {
597 // This is taken from LinkResolver::resolve_field, sans access checks.
598 fieldDescriptor fd; // find_field initializes fd if found
599 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd));
600 // check if field exists; i.e., if a klass containing the field def has been selected
601 if (sel_klass.is_null()) return;
602 oop vmtarget = sel_klass->as_klassOop();
603 int vmindex = fd.offset();
604 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS);
605 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen
606 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget);
607 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex);
608 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
609 return;
610 }
611 default:
612 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
613 }
615 // Second chance.
616 if (polymorphic_method_type.not_null()) {
617 // Look on a non-null class loader.
618 Handle cur_class_loader;
619 const int nptypes = java_lang_invoke_MethodType::ptype_count(polymorphic_method_type());
620 for (int i = 0; i <= nptypes; i++) {
621 oop type_mirror;
622 if (i < nptypes) type_mirror = java_lang_invoke_MethodType::ptype(polymorphic_method_type(), i);
623 else type_mirror = java_lang_invoke_MethodType::rtype(polymorphic_method_type());
624 klassOop example_type = java_lang_Class::as_klassOop(type_mirror);
625 if (example_type == NULL) continue;
626 oop class_loader = Klass::cast(example_type)->class_loader();
627 if (class_loader == NULL || class_loader == cur_class_loader()) continue;
628 cur_class_loader = Handle(THREAD, class_loader);
629 methodOop m = SystemDictionary::find_method_handle_invoke(name,
630 type,
631 KlassHandle(THREAD, example_type),
632 THREAD);
633 if (HAS_PENDING_EXCEPTION) {
634 CLEAR_PENDING_EXCEPTION;
635 m = NULL;
636 // try again with a different class loader...
637 }
638 if (m != NULL) {
639 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
640 java_lang_invoke_MemberName::set_vmtarget(mname(), m);
641 java_lang_invoke_MemberName::set_vmindex(mname(), m->vtable_index());
642 java_lang_invoke_MemberName::set_modifiers(mname(), mods);
643 return;
644 }
645 }
646 }
647 }
649 // Conversely, a member name which is only initialized from JVM internals
650 // may have null defc, name, and type fields.
651 // Resolving it plants a vmtarget/vmindex in it,
652 // which refers directly to JVM internals.
653 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
654 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
655 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
656 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
657 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) {
658 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
659 }
661 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
662 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
663 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
664 int flags = java_lang_invoke_MemberName::flags(mname());
666 if (suppress != 0) {
667 if (suppress & _suppress_defc) have_defc = true;
668 if (suppress & _suppress_name) have_name = true;
669 if (suppress & _suppress_type) have_type = true;
670 }
672 if (have_defc && have_name && have_type) return; // nothing needed
674 switch (flags & ALL_KINDS) {
675 case IS_METHOD:
676 case IS_CONSTRUCTOR:
677 {
678 KlassHandle receiver_limit; int decode_flags = 0;
679 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit, decode_flags);
680 if (m.is_null()) break;
681 if (!have_defc) {
682 klassOop defc = m->method_holder();
683 if (receiver_limit.not_null() && receiver_limit() != defc
684 && Klass::cast(receiver_limit())->is_subtype_of(defc))
685 defc = receiver_limit();
686 java_lang_invoke_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror());
687 }
688 if (!have_name) {
689 //not java_lang_String::create_from_symbol; let's intern member names
690 Handle name = StringTable::intern(m->name(), CHECK);
691 java_lang_invoke_MemberName::set_name(mname(), name());
692 }
693 if (!have_type) {
694 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
695 java_lang_invoke_MemberName::set_type(mname(), type());
696 }
697 return;
698 }
699 case IS_FIELD:
700 {
701 // This is taken from LinkResolver::resolve_field, sans access checks.
702 if (!vmtarget->is_klass()) break;
703 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break;
704 instanceKlassHandle defc(THREAD, (klassOop) vmtarget);
705 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
706 fieldDescriptor fd; // find_field initializes fd if found
707 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
708 break; // cannot expand
709 if (!have_defc) {
710 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
711 }
712 if (!have_name) {
713 //not java_lang_String::create_from_symbol; let's intern member names
714 Handle name = StringTable::intern(fd.name(), CHECK);
715 java_lang_invoke_MemberName::set_name(mname(), name());
716 }
717 if (!have_type) {
718 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
719 java_lang_invoke_MemberName::set_type(mname(), type());
720 }
721 return;
722 }
723 }
724 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
725 }
727 int MethodHandles::find_MemberNames(klassOop k,
728 Symbol* name, Symbol* sig,
729 int mflags, klassOop caller,
730 int skip, objArrayOop results) {
731 DEBUG_ONLY(No_Safepoint_Verifier nsv);
732 // this code contains no safepoints!
734 // %%% take caller into account!
736 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1;
738 int rfill = 0, rlimit = results->length(), rskip = skip;
739 // overflow measurement:
740 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
742 int match_flags = mflags;
743 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
744 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
745 bool local_only = !(search_superc | search_intfc);
746 bool classes_only = false;
748 if (name != NULL) {
749 if (name->utf8_length() == 0) return 0; // a match is not possible
750 }
751 if (sig != NULL) {
752 if (sig->utf8_length() == 0) return 0; // a match is not possible
753 if (sig->byte_at(0) == '(')
754 match_flags &= ~(IS_FIELD | IS_TYPE);
755 else
756 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
757 }
759 if ((match_flags & IS_TYPE) != 0) {
760 // NYI, and Core Reflection works quite well for this query
761 }
763 if ((match_flags & IS_FIELD) != 0) {
764 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
765 if (name != NULL && st.name() != name)
766 continue;
767 if (sig != NULL && st.signature() != sig)
768 continue;
769 // passed the filters
770 if (rskip > 0) {
771 --rskip;
772 } else if (rfill < rlimit) {
773 oop result = results->obj_at(rfill++);
774 if (!java_lang_invoke_MemberName::is_instance(result))
775 return -99; // caller bug!
776 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset());
777 } else if (++overflow >= overflow_limit) {
778 match_flags = 0; break; // got tired of looking at overflow
779 }
780 }
781 }
783 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
784 // watch out for these guys:
785 Symbol* init_name = vmSymbols::object_initializer_name();
786 Symbol* clinit_name = vmSymbols::class_initializer_name();
787 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
788 bool negate_name_test = false;
789 // fix name so that it captures the intention of IS_CONSTRUCTOR
790 if (!(match_flags & IS_METHOD)) {
791 // constructors only
792 if (name == NULL) {
793 name = init_name;
794 } else if (name != init_name) {
795 return 0; // no constructors of this method name
796 }
797 } else if (!(match_flags & IS_CONSTRUCTOR)) {
798 // methods only
799 if (name == NULL) {
800 name = init_name;
801 negate_name_test = true; // if we see the name, we *omit* the entry
802 } else if (name == init_name) {
803 return 0; // no methods of this constructor name
804 }
805 } else {
806 // caller will accept either sort; no need to adjust name
807 }
808 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
809 methodOop m = st.method();
810 Symbol* m_name = m->name();
811 if (m_name == clinit_name)
812 continue;
813 if (name != NULL && ((m_name != name) ^ negate_name_test))
814 continue;
815 if (sig != NULL && m->signature() != sig)
816 continue;
817 // passed the filters
818 if (rskip > 0) {
819 --rskip;
820 } else if (rfill < rlimit) {
821 oop result = results->obj_at(rfill++);
822 if (!java_lang_invoke_MemberName::is_instance(result))
823 return -99; // caller bug!
824 MethodHandles::init_MemberName(result, m, true);
825 } else if (++overflow >= overflow_limit) {
826 match_flags = 0; break; // got tired of looking at overflow
827 }
828 }
829 }
831 // return number of elements we at leasted wanted to initialize
832 return rfill + overflow;
833 }
836 // Decode this java.lang.Class object into an instanceKlass, if possible.
837 // Throw IAE if not
838 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) {
839 instanceKlassHandle empty;
840 klassOop caller = NULL;
841 if (java_lang_Class::is_instance(java_mirror_oop)) {
842 caller = java_lang_Class::as_klassOop(java_mirror_oop);
843 }
844 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) {
845 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty);
846 }
847 return instanceKlassHandle(THREAD, caller);
848 }
852 // Decode the vmtarget field of a method handle.
853 // Sanitize out methodOops, klassOops, and any other non-Java data.
854 // This is for debugging and reflection.
855 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) {
856 assert(java_lang_invoke_MethodHandle::is_instance(mh()), "must be a MH");
857 if (format == ETF_HANDLE_OR_METHOD_NAME) {
858 oop target = java_lang_invoke_MethodHandle::vmtarget(mh());
859 if (target == NULL) {
860 return NULL; // unformed MH
861 }
862 klassOop tklass = target->klass();
863 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) {
864 return target; // target is another MH (or something else?)
865 }
866 }
867 if (format == ETF_DIRECT_HANDLE) {
868 oop target = mh();
869 for (;;) {
870 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
871 return target;
872 }
873 if (!java_lang_invoke_MethodHandle::is_instance(target)){
874 return NULL; // unformed MH
875 }
876 target = java_lang_invoke_MethodHandle::vmtarget(target);
877 }
878 }
879 // cases of metadata in MH.vmtarget:
880 // - AMH can have methodOop for static invoke with bound receiver
881 // - DMH can have methodOop for static invoke (on variable receiver)
882 // - DMH can have klassOop for dispatched (non-static) invoke
883 KlassHandle receiver_limit; int decode_flags = 0;
884 methodHandle m = decode_MethodHandle(mh(), receiver_limit, decode_flags);
885 if (m.is_null()) return NULL;
886 switch (format) {
887 case ETF_REFLECT_METHOD:
888 // same as jni_ToReflectedMethod:
889 if (m->is_initializer()) {
890 return Reflection::new_constructor(m, THREAD);
891 } else {
892 return Reflection::new_method(m, UseNewReflection, false, THREAD);
893 }
895 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle
896 case ETF_METHOD_NAME:
897 {
898 if (SystemDictionary::MemberName_klass() == NULL) break;
899 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass());
900 mname_klass->initialize(CHECK_NULL);
901 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); // possible safepoint
902 java_lang_invoke_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED);
903 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
904 init_MemberName(mname(), m(), do_dispatch);
905 expand_MemberName(mname, 0, CHECK_NULL);
906 return mname();
907 }
908 }
910 // Unknown format code.
911 char msg[50];
912 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format);
913 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg);
914 }
916 static const char* always_null_names[] = {
917 "java/lang/Void",
918 "java/lang/Null",
919 //"java/lang/Nothing",
920 "sun/dyn/empty/Empty",
921 "sun/invoke/empty/Empty",
922 NULL
923 };
925 static bool is_always_null_type(klassOop klass) {
926 if (klass == NULL) return false; // safety
927 if (!Klass::cast(klass)->oop_is_instance()) return false;
928 instanceKlass* ik = instanceKlass::cast(klass);
929 // Must be on the boot class path:
930 if (ik->class_loader() != NULL) return false;
931 // Check the name.
932 Symbol* name = ik->name();
933 for (int i = 0; ; i++) {
934 const char* test_name = always_null_names[i];
935 if (test_name == NULL) break;
936 if (name->equals(test_name))
937 return true;
938 }
939 return false;
940 }
942 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) {
943 if (dst == NULL) return true;
944 if (src == NULL) return (dst != SystemDictionary::Object_klass());
945 if (src == dst || dst == SystemDictionary::Object_klass())
946 return false; // quickest checks
947 Klass* srck = Klass::cast(src);
948 Klass* dstk = Klass::cast(dst);
949 if (dstk->is_interface()) {
950 // interface receivers can safely be viewed as untyped,
951 // because interface calls always include a dynamic check
952 //dstk = Klass::cast(SystemDictionary::Object_klass());
953 return false;
954 }
955 if (srck->is_interface()) {
956 // interface arguments must be viewed as untyped
957 //srck = Klass::cast(SystemDictionary::Object_klass());
958 return true;
959 }
960 if (is_always_null_type(src)) {
961 // some source types are known to be never instantiated;
962 // they represent references which are always null
963 // such null references never fail to convert safely
964 return false;
965 }
966 return !srck->is_subclass_of(dstk->as_klassOop());
967 }
969 static oop object_java_mirror() {
970 return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
971 }
973 bool MethodHandles::same_basic_type_for_arguments(BasicType src,
974 BasicType dst,
975 bool raw,
976 bool for_return) {
977 if (for_return) {
978 // return values can always be forgotten:
979 if (dst == T_VOID) return true;
980 if (src == T_VOID) return raw && (dst == T_INT);
981 // We allow caller to receive a garbage int, which is harmless.
982 // This trick is pulled by trusted code (see VerifyType.canPassRaw).
983 }
984 assert(src != T_VOID && dst != T_VOID, "should not be here");
985 if (src == dst) return true;
986 if (type2size[src] != type2size[dst]) return false;
987 if (src == T_OBJECT || dst == T_OBJECT) return false;
988 if (raw) return true; // bitwise reinterpretation; caller guarantees safety
989 // allow reinterpretation casts for integral widening
990 if (is_subword_type(src)) { // subwords can fit in int or other subwords
991 if (dst == T_INT) // any subword fits in an int
992 return true;
993 if (src == T_BOOLEAN) // boolean fits in any subword
994 return is_subword_type(dst);
995 if (src == T_BYTE && dst == T_SHORT)
996 return true; // remaining case: byte fits in short
997 }
998 // allow float/fixed reinterpretation casts
999 if (src == T_FLOAT) return dst == T_INT;
1000 if (src == T_INT) return dst == T_FLOAT;
1001 if (src == T_DOUBLE) return dst == T_LONG;
1002 if (src == T_LONG) return dst == T_DOUBLE;
1003 return false;
1004 }
1006 const char* MethodHandles::check_method_receiver(methodOop m,
1007 klassOop passed_recv_type) {
1008 assert(!m->is_static(), "caller resp.");
1009 if (passed_recv_type == NULL)
1010 return "receiver type is primitive";
1011 if (class_cast_needed(passed_recv_type, m->method_holder())) {
1012 Klass* formal = Klass::cast(m->method_holder());
1013 return SharedRuntime::generate_class_cast_message("receiver type",
1014 formal->external_name());
1015 }
1016 return NULL; // checks passed
1017 }
1019 // Verify that m's signature can be called type-safely by a method handle
1020 // of the given method type 'mtype'.
1021 // It takes a TRAPS argument because it must perform symbol lookups.
1022 void MethodHandles::verify_method_signature(methodHandle m,
1023 Handle mtype,
1024 int first_ptype_pos,
1025 KlassHandle insert_ptype,
1026 TRAPS) {
1027 Handle mhi_type;
1028 if (m->is_method_handle_invoke()) {
1029 // use this more exact typing instead of the symbolic signature:
1030 mhi_type = Handle(THREAD, m->method_handle_type());
1031 }
1032 objArrayHandle ptypes(THREAD, java_lang_invoke_MethodType::ptypes(mtype()));
1033 int pnum = first_ptype_pos;
1034 int pmax = ptypes->length();
1035 int anum = 0; // method argument
1036 const char* err = NULL;
1037 ResourceMark rm(THREAD);
1038 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
1039 oop ptype_oop = NULL;
1040 if (ss.at_return_type()) {
1041 if (pnum != pmax)
1042 { err = "too many arguments"; break; }
1043 ptype_oop = java_lang_invoke_MethodType::rtype(mtype());
1044 } else {
1045 if (pnum >= pmax)
1046 { err = "not enough arguments"; break; }
1047 if (pnum >= 0)
1048 ptype_oop = ptypes->obj_at(pnum);
1049 else if (insert_ptype.is_null())
1050 ptype_oop = NULL;
1051 else
1052 ptype_oop = insert_ptype->java_mirror();
1053 pnum += 1;
1054 anum += 1;
1055 }
1056 KlassHandle pklass;
1057 BasicType ptype = T_OBJECT;
1058 bool have_ptype = false;
1059 // missing ptype_oop does not match any non-reference; use Object to report the error
1060 pklass = SystemDictionaryHandles::Object_klass();
1061 if (ptype_oop != NULL) {
1062 have_ptype = true;
1063 klassOop pklass_oop = NULL;
1064 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass_oop);
1065 pklass = KlassHandle(THREAD, pklass_oop);
1066 }
1067 ptype_oop = NULL; //done with this
1068 KlassHandle aklass;
1069 BasicType atype = ss.type();
1070 if (atype == T_ARRAY) atype = T_OBJECT; // fold all refs to T_OBJECT
1071 if (atype == T_OBJECT) {
1072 if (!have_ptype) {
1073 // null matches any reference
1074 continue;
1075 }
1076 if (mhi_type.is_null()) {
1077 // If we fail to resolve types at this point, we will usually throw an error.
1078 TempNewSymbol name = ss.as_symbol_or_null();
1079 if (name != NULL) {
1080 instanceKlass* mk = instanceKlass::cast(m->method_holder());
1081 Handle loader(THREAD, mk->class_loader());
1082 Handle domain(THREAD, mk->protection_domain());
1083 klassOop aklass_oop = SystemDictionary::resolve_or_null(name, loader, domain, CHECK);
1084 if (aklass_oop != NULL)
1085 aklass = KlassHandle(THREAD, aklass_oop);
1086 }
1087 } else {
1088 // for method handle invokers we don't look at the name in the signature
1089 oop atype_oop;
1090 if (ss.at_return_type())
1091 atype_oop = java_lang_invoke_MethodType::rtype(mhi_type());
1092 else
1093 atype_oop = java_lang_invoke_MethodType::ptype(mhi_type(), anum-1);
1094 klassOop aklass_oop = NULL;
1095 atype = java_lang_Class::as_BasicType(atype_oop, &aklass_oop);
1096 aklass = KlassHandle(THREAD, aklass_oop);
1097 }
1098 }
1099 if (!ss.at_return_type()) {
1100 err = check_argument_type_change(ptype, pklass(), atype, aklass(), anum);
1101 } else {
1102 err = check_return_type_change(atype, aklass(), ptype, pklass()); // note reversal!
1103 }
1104 if (err != NULL) break;
1105 }
1107 if (err != NULL) {
1108 #ifndef PRODUCT
1109 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1110 tty->print("*** verify_method_signature failed: ");
1111 java_lang_invoke_MethodType::print_signature(mtype(), tty);
1112 tty->cr();
1113 tty->print_cr(" first_ptype_pos = %d, insert_ptype = "UINTX_FORMAT, first_ptype_pos, insert_ptype());
1114 tty->print(" Failing method: ");
1115 m->print();
1116 }
1117 #endif //PRODUCT
1118 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1119 }
1120 }
1122 // Main routine for verifying the MethodHandle.type of a proposed
1123 // direct or bound-direct method handle.
1124 void MethodHandles::verify_method_type(methodHandle m,
1125 Handle mtype,
1126 bool has_bound_recv,
1127 KlassHandle bound_recv_type,
1128 TRAPS) {
1129 bool m_needs_receiver = !m->is_static();
1131 const char* err = NULL;
1133 int first_ptype_pos = m_needs_receiver ? 1 : 0;
1134 if (has_bound_recv) {
1135 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them
1136 if (m_needs_receiver && bound_recv_type.is_null())
1137 { err = "bound receiver is not an object"; goto die; }
1138 }
1140 if (m_needs_receiver && err == NULL) {
1141 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype());
1142 if (ptypes->length() < first_ptype_pos)
1143 { err = "receiver argument is missing"; goto die; }
1144 if (has_bound_recv)
1145 err = check_method_receiver(m(), bound_recv_type->as_klassOop());
1146 else
1147 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1)));
1148 if (err != NULL) goto die;
1149 }
1151 // Check the other arguments for mistypes.
1152 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK);
1153 return;
1155 die:
1156 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1157 }
1159 void MethodHandles::verify_vmslots(Handle mh, TRAPS) {
1160 // Verify vmslots.
1161 int check_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(mh()));
1162 if (java_lang_invoke_MethodHandle::vmslots(mh()) != check_slots) {
1163 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH");
1164 }
1165 }
1167 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) {
1168 // Verify that argslot points at the given argnum.
1169 int check_slot = argument_slot(java_lang_invoke_MethodHandle::type(mh()), argnum);
1170 if (argslot != check_slot || argslot < 0) {
1171 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d";
1172 size_t msglen = strlen(fmt) + 3*11 + 1;
1173 char* msg = NEW_RESOURCE_ARRAY(char, msglen);
1174 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot);
1175 THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
1176 }
1177 }
1179 // Verify the correspondence between two method types.
1180 // Apart from the advertised changes, caller method type X must
1181 // be able to invoke the callee method Y type with no violations
1182 // of type integrity.
1183 // Return NULL if all is well, else a short error message.
1184 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end,
1185 int insert_argnum, oop insert_type,
1186 int change_argnum, oop change_type,
1187 int delete_argnum,
1188 oop dst_mtype, int dst_beg, int dst_end,
1189 bool raw) {
1190 objArrayOop src_ptypes = java_lang_invoke_MethodType::ptypes(src_mtype);
1191 objArrayOop dst_ptypes = java_lang_invoke_MethodType::ptypes(dst_mtype);
1193 int src_max = src_ptypes->length();
1194 int dst_max = dst_ptypes->length();
1196 if (src_end == -1) src_end = src_max;
1197 if (dst_end == -1) dst_end = dst_max;
1199 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob");
1200 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob");
1202 // pending actions; set to -1 when done:
1203 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum;
1205 const char* err = NULL;
1207 // Walk along each array of parameter types, including a virtual
1208 // NULL end marker at the end of each.
1209 for (int src_idx = src_beg, dst_idx = dst_beg;
1210 (src_idx <= src_end && dst_idx <= dst_end);
1211 src_idx++, dst_idx++) {
1212 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx);
1213 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx);
1214 bool fix_null_src_type = false;
1216 // Perform requested edits.
1217 if (ins_idx == src_idx) {
1218 // note that the inserted guy is never affected by a change or deletion
1219 ins_idx = -1;
1220 src_type = insert_type;
1221 fix_null_src_type = true;
1222 --src_idx; // back up to process src type on next loop
1223 src_idx = src_end;
1224 } else {
1225 // note that the changed guy can be immediately deleted
1226 if (chg_idx == src_idx) {
1227 chg_idx = -1;
1228 assert(src_idx < src_end, "oob");
1229 src_type = change_type;
1230 fix_null_src_type = true;
1231 }
1232 if (del_idx == src_idx) {
1233 del_idx = -1;
1234 assert(src_idx < src_end, "oob");
1235 --dst_idx;
1236 continue; // rerun loop after skipping this position
1237 }
1238 }
1240 if (src_type == NULL && fix_null_src_type)
1241 // explicit null in this case matches any dest reference
1242 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type);
1244 // Compare the two argument types.
1245 if (src_type != dst_type) {
1246 if (src_type == NULL) return "not enough arguments";
1247 if (dst_type == NULL) return "too many arguments";
1248 err = check_argument_type_change(src_type, dst_type, dst_idx, raw);
1249 if (err != NULL) return err;
1250 }
1251 }
1253 // Now compare return types also.
1254 oop src_rtype = java_lang_invoke_MethodType::rtype(src_mtype);
1255 oop dst_rtype = java_lang_invoke_MethodType::rtype(dst_mtype);
1256 if (src_rtype != dst_rtype) {
1257 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal!
1258 if (err != NULL) return err;
1259 }
1261 assert(err == NULL, "");
1262 return NULL; // all is well
1263 }
1266 const char* MethodHandles::check_argument_type_change(BasicType src_type,
1267 klassOop src_klass,
1268 BasicType dst_type,
1269 klassOop dst_klass,
1270 int argnum,
1271 bool raw) {
1272 const char* err = NULL;
1273 bool for_return = (argnum < 0);
1275 // just in case:
1276 if (src_type == T_ARRAY) src_type = T_OBJECT;
1277 if (dst_type == T_ARRAY) dst_type = T_OBJECT;
1279 // Produce some nice messages if VerifyMethodHandles is turned on:
1280 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) {
1281 if (src_type == T_OBJECT) {
1282 if (raw && dst_type == T_INT && is_always_null_type(src_klass))
1283 return NULL; // OK to convert a null pointer to a garbage int
1284 err = ((argnum >= 0)
1285 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s"
1286 : "type mismatch: returning a %s, but caller expects primitive %s");
1287 } else if (dst_type == T_OBJECT) {
1288 err = ((argnum >= 0)
1289 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s"
1290 : "type mismatch: returning a primitive %s, but caller expects %s");
1291 } else {
1292 err = ((argnum >= 0)
1293 ? "type mismatch: passing a %s for method argument #%d, which expects %s"
1294 : "type mismatch: returning a %s, but caller expects %s");
1295 }
1296 } else if (src_type == T_OBJECT && dst_type == T_OBJECT &&
1297 class_cast_needed(src_klass, dst_klass)) {
1298 if (!class_cast_needed(dst_klass, src_klass)) {
1299 if (raw)
1300 return NULL; // reverse cast is OK; the MH target is trusted to enforce it
1301 err = ((argnum >= 0)
1302 ? "cast required: passing a %s for method argument #%d, which expects %s"
1303 : "cast required: returning a %s, but caller expects %s");
1304 } else {
1305 err = ((argnum >= 0)
1306 ? "reference mismatch: passing a %s for method argument #%d, which expects %s"
1307 : "reference mismatch: returning a %s, but caller expects %s");
1308 }
1309 } else {
1310 // passed the obstacle course
1311 return NULL;
1312 }
1314 // format, format, format
1315 const char* src_name = type2name(src_type);
1316 const char* dst_name = type2name(dst_type);
1317 if (src_name == NULL) src_name = "unknown type";
1318 if (dst_name == NULL) dst_name = "unknown type";
1319 if (src_type == T_OBJECT)
1320 src_name = (src_klass != NULL) ? Klass::cast(src_klass)->external_name() : "an unresolved class";
1321 if (dst_type == T_OBJECT)
1322 dst_name = (dst_klass != NULL) ? Klass::cast(dst_klass)->external_name() : "an unresolved class";
1324 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11);
1325 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1);
1326 if (argnum >= 0) {
1327 assert(strstr(err, "%d") != NULL, "");
1328 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name);
1329 } else {
1330 assert(strstr(err, "%d") == NULL, "");
1331 jio_snprintf(msg, msglen, err, src_name, dst_name);
1332 }
1333 return msg;
1334 }
1336 // Compute the depth within the stack of the given argument, i.e.,
1337 // the combined size of arguments to the right of the given argument.
1338 // For the last argument (ptypes.length-1) this will be zero.
1339 // For the first argument (0) this will be the size of all
1340 // arguments but that one. For the special number -1, this
1341 // will be the size of all arguments, including the first.
1342 // If the argument is neither -1 nor a valid argument index,
1343 // then return a negative number. Otherwise, the result
1344 // is in the range [0..vmslots] inclusive.
1345 int MethodHandles::argument_slot(oop method_type, int arg) {
1346 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type);
1347 int argslot = 0;
1348 int len = ptypes->length();
1349 if (arg < -1 || arg >= len) return -99;
1350 for (int i = len-1; i > arg; i--) {
1351 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1352 argslot += type2size[bt];
1353 }
1354 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works");
1355 return argslot;
1356 }
1358 // Given a slot number, return the argument number.
1359 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) {
1360 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type);
1361 int argslot = 0;
1362 int len = ptypes->length();
1363 for (int i = len-1; i >= 0; i--) {
1364 if (query_argslot == argslot) return i;
1365 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
1366 argslot += type2size[bt];
1367 }
1368 // return pseudo-arg deepest in stack:
1369 if (query_argslot == argslot) return -1;
1370 return -99; // oob slot, or splitting a double-slot arg
1371 }
1373 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m,
1374 KlassHandle receiver_limit,
1375 int decode_flags,
1376 KlassHandle receiver_klass,
1377 TRAPS) {
1378 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference");
1379 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument");
1381 if (!m->is_static() &&
1382 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder())))
1383 // given type does not match class of method, or receiver is null!
1384 // caller should have checked this, but let's be extra careful...
1385 return methodHandle();
1387 if (receiver_limit.not_null() &&
1388 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit())))
1389 // given type is not limited to the receiver type
1390 // note that a null receiver can match any reference value, for a static method
1391 return methodHandle();
1393 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) {
1394 // pre-dispatched or static method (null receiver is OK for static)
1395 return m;
1397 } else if (receiver_klass.is_null()) {
1398 // null receiver value; cannot dispatch
1399 return methodHandle();
1401 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) {
1402 // perform virtual dispatch
1403 int vtable_index = m->vtable_index();
1404 guarantee(vtable_index >= 0, "valid vtable index");
1406 // receiver_klass might be an arrayKlassOop but all vtables start at
1407 // the same place. The cast is to avoid virtual call and assertion.
1408 // See also LinkResolver::runtime_resolve_virtual_method.
1409 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass());
1410 DEBUG_ONLY(inst->verify_vtable_index(vtable_index));
1411 methodOop m_oop = inst->method_at_vtable(vtable_index);
1412 return methodHandle(THREAD, m_oop);
1414 } else {
1415 // perform interface dispatch
1416 int itable_index = klassItable::compute_itable_index(m());
1417 guarantee(itable_index >= 0, "valid itable index");
1418 instanceKlass* inst = instanceKlass::cast(receiver_klass());
1419 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD);
1420 return methodHandle(THREAD, m_oop);
1421 }
1422 }
1424 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) {
1425 // Verify type.
1426 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1427 verify_method_type(m, mtype, false, KlassHandle(), CHECK);
1429 // Verify vmslots.
1430 if (java_lang_invoke_MethodHandle::vmslots(mh()) != m->size_of_parameters()) {
1431 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH");
1432 }
1433 }
1435 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) {
1436 // Check arguments.
1437 if (mh.is_null() || m.is_null() ||
1438 (!do_dispatch && m->is_abstract())) {
1439 THROW(vmSymbols::java_lang_InternalError());
1440 }
1442 java_lang_invoke_MethodHandle::init_vmslots(mh());
1444 if (VerifyMethodHandles) {
1445 // The privileged code which invokes this routine should not make
1446 // a mistake about types, but it's better to verify.
1447 verify_DirectMethodHandle(mh, m, CHECK);
1448 }
1450 // Finally, after safety checks are done, link to the target method.
1451 // We will follow the same path as the latter part of
1452 // InterpreterRuntime::resolve_invoke(), which first finds the method
1453 // and then decides how to populate the constant pool cache entry
1454 // that links the interpreter calls to the method. We need the same
1455 // bits, and will use the same calling sequence code.
1457 int vmindex = methodOopDesc::garbage_vtable_index;
1458 Handle vmtarget;
1460 instanceKlass::cast(m->method_holder())->link_class(CHECK);
1462 MethodHandleEntry* me = NULL;
1463 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) {
1464 // We are simulating an invokeinterface instruction.
1465 // (We might also be simulating an invokevirtual on a miranda method,
1466 // but it is safe to treat it as an invokeinterface.)
1467 assert(!m->can_be_statically_bound(), "no final methods on interfaces");
1468 vmindex = klassItable::compute_itable_index(m());
1469 assert(vmindex >= 0, "(>=0) == do_dispatch");
1470 // Set up same bits as ConstantPoolCacheEntry::set_interface_call().
1471 vmtarget = m->method_holder(); // the interface
1472 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh);
1473 } else if (!do_dispatch || m->can_be_statically_bound()) {
1474 // We are simulating an invokestatic or invokespecial instruction.
1475 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method().
1476 vmtarget = m;
1477 // this does not help dispatch, but it will make it possible to parse this MH:
1478 vmindex = methodOopDesc::nonvirtual_vtable_index;
1479 assert(vmindex < 0, "(>=0) == do_dispatch");
1480 if (!m->is_static()) {
1481 me = MethodHandles::entry(MethodHandles::_invokespecial_mh);
1482 } else {
1483 me = MethodHandles::entry(MethodHandles::_invokestatic_mh);
1484 // Part of the semantics of a static call is an initialization barrier.
1485 // For a DMH, it is done now, when the handle is created.
1486 Klass* k = Klass::cast(m->method_holder());
1487 if (k->should_be_initialized()) {
1488 k->initialize(CHECK); // possible safepoint
1489 }
1490 }
1491 } else {
1492 // We are simulating an invokevirtual instruction.
1493 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method().
1494 // The key logic is LinkResolver::runtime_resolve_virtual_method.
1495 vmindex = m->vtable_index();
1496 vmtarget = m->method_holder();
1497 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh);
1498 }
1500 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
1502 java_lang_invoke_DirectMethodHandle::set_vmtarget(mh(), vmtarget());
1503 java_lang_invoke_DirectMethodHandle::set_vmindex( mh(), vmindex);
1504 DEBUG_ONLY(KlassHandle rlimit; int flags);
1505 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m,
1506 "properly stored for later decoding");
1507 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0));
1508 assert(!(actual_do_dispatch && !do_dispatch),
1509 "do not perform dispatch if !do_dispatch specified");
1510 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch");
1511 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack");
1513 // Done!
1514 java_lang_invoke_MethodHandle::set_vmentry(mh(), me);
1515 }
1517 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh,
1518 methodHandle m,
1519 TRAPS) {
1520 // Verify type.
1521 KlassHandle bound_recv_type;
1522 {
1523 oop receiver = java_lang_invoke_BoundMethodHandle::argument(mh());
1524 if (receiver != NULL)
1525 bound_recv_type = KlassHandle(THREAD, receiver->klass());
1526 }
1527 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1528 verify_method_type(m, mtype, true, bound_recv_type, CHECK);
1530 int receiver_pos = m->size_of_parameters() - 1;
1532 // Verify MH.vmargslot, which should point at the bound receiver.
1533 verify_vmargslot(mh, -1, java_lang_invoke_BoundMethodHandle::vmargslot(mh()), CHECK);
1534 //verify_vmslots(mh, CHECK);
1536 // Verify vmslots.
1537 if (java_lang_invoke_MethodHandle::vmslots(mh()) != receiver_pos) {
1538 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)");
1539 }
1540 }
1542 // Initialize a BMH with a receiver bound directly to a methodOop.
1543 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh,
1544 methodHandle original_m,
1545 KlassHandle receiver_limit,
1546 int decode_flags,
1547 TRAPS) {
1548 // Check arguments.
1549 if (mh.is_null() || original_m.is_null()) {
1550 THROW(vmSymbols::java_lang_InternalError());
1551 }
1553 KlassHandle receiver_klass;
1554 {
1555 oop receiver_oop = java_lang_invoke_BoundMethodHandle::argument(mh());
1556 if (receiver_oop != NULL)
1557 receiver_klass = KlassHandle(THREAD, receiver_oop->klass());
1558 }
1559 methodHandle m = dispatch_decoded_method(original_m,
1560 receiver_limit, decode_flags,
1561 receiver_klass,
1562 CHECK);
1563 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); }
1564 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); }
1566 java_lang_invoke_MethodHandle::init_vmslots(mh());
1568 if (VerifyMethodHandles) {
1569 verify_BoundMethodHandle_with_receiver(mh, m, CHECK);
1570 }
1572 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m());
1574 DEBUG_ONLY(KlassHandle junk1; int junk2);
1575 assert(MethodHandles::decode_method(mh(), junk1, junk2) == m, "properly stored for later decoding");
1576 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot");
1578 // Done!
1579 java_lang_invoke_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh));
1580 }
1582 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
1583 bool direct_to_method, TRAPS) {
1584 Handle ptype_handle(THREAD,
1585 java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum));
1586 KlassHandle ptype_klass;
1587 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass);
1588 int slots_pushed = type2size[ptype];
1590 oop argument = java_lang_invoke_BoundMethodHandle::argument(mh());
1592 const char* err = NULL;
1594 switch (ptype) {
1595 case T_OBJECT:
1596 if (argument != NULL)
1597 // we must implicitly convert from the arg type to the outgoing ptype
1598 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum);
1599 break;
1601 case T_ARRAY: case T_VOID:
1602 assert(false, "array, void do not appear here");
1603 default:
1604 if (ptype != T_INT && !is_subword_type(ptype)) {
1605 err = "unexpected parameter type";
1606 break;
1607 }
1608 // check subrange of Integer.value, if necessary
1609 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) {
1610 err = "bound integer argument must be of type java.lang.Integer";
1611 break;
1612 }
1613 if (ptype != T_INT) {
1614 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
1615 jint value = argument->int_field(value_offset);
1616 int vminfo = adapter_unbox_subword_vminfo(ptype);
1617 jint subword = truncate_subword_from_vminfo(value, vminfo);
1618 if (value != subword) {
1619 err = "bound subword value does not fit into the subword type";
1620 break;
1621 }
1622 }
1623 break;
1624 case T_FLOAT:
1625 case T_DOUBLE:
1626 case T_LONG:
1627 {
1628 // we must implicitly convert from the unboxed arg type to the outgoing ptype
1629 BasicType argbox = java_lang_boxing_object::basic_type(argument);
1630 if (argbox != ptype) {
1631 err = check_argument_type_change(T_OBJECT, (argument == NULL
1632 ? SystemDictionary::Object_klass()
1633 : argument->klass()),
1634 ptype, ptype_klass(), argnum);
1635 assert(err != NULL, "this must be an error");
1636 }
1637 break;
1638 }
1639 }
1641 if (err == NULL) {
1642 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1643 if (direct_to_method) {
1644 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots");
1645 assert(slots_pushed <= MethodHandlePushLimit, "");
1646 } else {
1647 int target_pushes = decode_MethodHandle_stack_pushes(target());
1648 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct");
1649 // do not blow the stack; use a Java-based adapter if this limit is exceeded
1650 // FIXME
1651 // if (slots_pushed + target_pushes > MethodHandlePushLimit)
1652 // err = "too many bound parameters";
1653 }
1654 }
1656 if (err == NULL) {
1657 // Verify the rest of the method type.
1658 err = check_method_type_insertion(java_lang_invoke_MethodHandle::type(mh()),
1659 argnum, ptype_handle(),
1660 java_lang_invoke_MethodHandle::type(target()));
1661 }
1663 if (err != NULL) {
1664 THROW_MSG(vmSymbols::java_lang_InternalError(), err);
1665 }
1666 }
1668 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
1669 // Check arguments.
1670 if (mh.is_null() || target.is_null() || !java_lang_invoke_MethodHandle::is_instance(target())) {
1671 THROW(vmSymbols::java_lang_InternalError());
1672 }
1674 java_lang_invoke_MethodHandle::init_vmslots(mh());
1676 if (VerifyMethodHandles) {
1677 int insert_after = argnum - 1;
1678 verify_vmargslot(mh, insert_after, java_lang_invoke_BoundMethodHandle::vmargslot(mh()), CHECK);
1679 verify_vmslots(mh, CHECK);
1680 }
1682 // Get bound type and required slots.
1683 BasicType ptype;
1684 {
1685 oop ptype_oop = java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum);
1686 ptype = java_lang_Class::as_BasicType(ptype_oop);
1687 }
1688 int slots_pushed = type2size[ptype];
1690 // If (a) the target is a direct non-dispatched method handle,
1691 // or (b) the target is a dispatched direct method handle and we
1692 // are binding the receiver, cut out the middle-man.
1693 // Do this by decoding the DMH and using its methodOop directly as vmtarget.
1694 bool direct_to_method = false;
1695 if (OptimizeMethodHandles &&
1696 target->klass() == SystemDictionary::DirectMethodHandle_klass() &&
1697 (argnum == 0 || java_lang_invoke_DirectMethodHandle::vmindex(target()) < 0)) {
1698 KlassHandle receiver_limit; int decode_flags = 0;
1699 methodHandle m = decode_method(target(), receiver_limit, decode_flags);
1700 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); }
1701 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg.
1702 assert(java_lang_invoke_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig");
1703 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) {
1704 init_BoundMethodHandle_with_receiver(mh, m,
1705 receiver_limit, decode_flags,
1706 CHECK);
1707 return;
1708 }
1710 // Even if it is not a bound receiver, we still might be able
1711 // to bind another argument and still invoke the methodOop directly.
1712 if (!(decode_flags & _dmf_does_dispatch)) {
1713 direct_to_method = true;
1714 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m());
1715 }
1716 }
1717 if (!direct_to_method)
1718 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), target());
1720 if (VerifyMethodHandles) {
1721 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK);
1722 }
1724 // Next question: Is this a ref, int, or long bound value?
1725 MethodHandleEntry* me = NULL;
1726 if (ptype == T_OBJECT) {
1727 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh);
1728 else me = MethodHandles::entry(_bound_ref_mh);
1729 } else if (slots_pushed == 2) {
1730 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh);
1731 else me = MethodHandles::entry(_bound_long_mh);
1732 } else if (slots_pushed == 1) {
1733 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh);
1734 else me = MethodHandles::entry(_bound_int_mh);
1735 } else {
1736 assert(false, "");
1737 }
1739 // Done!
1740 java_lang_invoke_MethodHandle::set_vmentry(mh(), me);
1741 }
1743 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) {
1744 char msg[200];
1745 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err);
1746 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg);
1747 }
1749 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) {
1750 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
1751 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
1753 verify_vmargslot(mh, argnum, argslot, CHECK);
1754 verify_vmslots(mh, CHECK);
1756 jint conv_op = adapter_conversion_op(conversion);
1757 if (!conv_op_valid(conv_op)) {
1758 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD);
1759 return;
1760 }
1761 EntryKind ek = adapter_entry_kind(conv_op);
1763 int stack_move = adapter_conversion_stack_move(conversion);
1764 BasicType src = adapter_conversion_src_type(conversion);
1765 BasicType dest = adapter_conversion_dest_type(conversion);
1766 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
1768 Handle argument(THREAD, java_lang_invoke_AdapterMethodHandle::argument(mh()));
1769 Handle target(THREAD, java_lang_invoke_AdapterMethodHandle::vmtarget(mh()));
1770 Handle src_mtype(THREAD, java_lang_invoke_MethodHandle::type(mh()));
1771 Handle dst_mtype(THREAD, java_lang_invoke_MethodHandle::type(target()));
1773 const char* err = NULL;
1775 if (err == NULL) {
1776 // Check that the correct argument is supplied, but only if it is required.
1777 switch (ek) {
1778 case _adapter_check_cast: // target type of cast
1779 case _adapter_ref_to_prim: // wrapper type from which to unbox
1780 case _adapter_prim_to_ref: // wrapper type to box into
1781 case _adapter_collect_args: // array type to collect into
1782 case _adapter_spread_args: // array type to spread from
1783 if (!java_lang_Class::is_instance(argument())
1784 || java_lang_Class::is_primitive(argument()))
1785 { err = "adapter requires argument of type java.lang.Class"; break; }
1786 if (ek == _adapter_collect_args ||
1787 ek == _adapter_spread_args) {
1788 // Make sure it is a suitable collection type. (Array, for now.)
1789 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument()));
1790 if (!ak->oop_is_objArray()) {
1791 { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; }
1792 }
1793 }
1794 break;
1795 case _adapter_flyby:
1796 case _adapter_ricochet:
1797 if (!java_lang_invoke_MethodHandle::is_instance(argument()))
1798 { err = "MethodHandle adapter argument required"; break; }
1799 break;
1800 default:
1801 if (argument.not_null())
1802 { err = "adapter has spurious argument"; break; }
1803 break;
1804 }
1805 }
1807 if (err == NULL) {
1808 // Check that the src/dest types are supplied if needed.
1809 switch (ek) {
1810 case _adapter_check_cast:
1811 if (src != T_OBJECT || dest != T_OBJECT) {
1812 err = "adapter requires object src/dest conversion subfields";
1813 }
1814 break;
1815 case _adapter_prim_to_prim:
1816 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) {
1817 err = "adapter requires primitive src/dest conversion subfields"; break;
1818 }
1819 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) ||
1820 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) {
1821 err = "adapter cannot convert beween floating and fixed-point"; break;
1822 }
1823 break;
1824 case _adapter_ref_to_prim:
1825 if (src != T_OBJECT || !is_java_primitive(dest)
1826 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) {
1827 err = "adapter requires primitive dest conversion subfield"; break;
1828 }
1829 break;
1830 case _adapter_prim_to_ref:
1831 if (!is_java_primitive(src) || dest != T_OBJECT
1832 || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) {
1833 err = "adapter requires primitive src conversion subfield"; break;
1834 }
1835 break;
1836 case _adapter_swap_args:
1837 case _adapter_rot_args:
1838 {
1839 if (!src || src != dest) {
1840 err = "adapter requires src/dest conversion subfields for swap"; break;
1841 }
1842 int swap_size = type2size[src];
1843 oop src_mtype = java_lang_invoke_AdapterMethodHandle::type(mh());
1844 oop dest_mtype = java_lang_invoke_AdapterMethodHandle::type(target());
1845 int slot_limit = java_lang_invoke_AdapterMethodHandle::vmslots(target());
1846 int src_slot = argslot;
1847 int dest_slot = vminfo;
1848 bool rotate_up = (src_slot > dest_slot); // upward rotation
1849 int src_arg = argnum;
1850 int dest_arg = argument_slot_to_argnum(dest_mtype, dest_slot);
1851 verify_vmargslot(mh, dest_arg, dest_slot, CHECK);
1852 if (!(dest_slot >= src_slot + swap_size) &&
1853 !(src_slot >= dest_slot + swap_size)) {
1854 err = "source, destination slots must be distinct";
1855 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) {
1856 err = "source of swap must be deeper in stack";
1857 } else if (ek == _adapter_swap_args) {
1858 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype, dest_arg),
1859 java_lang_invoke_MethodType::ptype(dest_mtype, src_arg),
1860 dest_arg);
1861 } else if (ek == _adapter_rot_args) {
1862 if (rotate_up) {
1863 assert((src_slot > dest_slot) && (src_arg < dest_arg), "");
1864 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot]
1865 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1]
1866 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) {
1867 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype, i),
1868 java_lang_invoke_MethodType::ptype(dest_mtype, i-1),
1869 i);
1870 }
1871 } else { // rotate down
1872 assert((src_slot < dest_slot) && (src_arg > dest_arg), "");
1873 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss]
1874 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg]
1875 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) {
1876 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype, i),
1877 java_lang_invoke_MethodType::ptype(dest_mtype, i+1),
1878 i);
1879 }
1880 }
1881 }
1882 if (err == NULL)
1883 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype, src_arg),
1884 java_lang_invoke_MethodType::ptype(dest_mtype, dest_arg),
1885 src_arg);
1886 }
1887 break;
1888 case _adapter_collect_args:
1889 case _adapter_spread_args:
1890 {
1891 BasicType coll_type = (ek == _adapter_collect_args) ? dest : src;
1892 BasicType elem_type = (ek == _adapter_collect_args) ? src : dest;
1893 if (coll_type != T_OBJECT || elem_type != T_OBJECT) {
1894 err = "adapter requires src/dest subfields"; break;
1895 // later:
1896 // - consider making coll be a primitive array
1897 // - consider making coll be a heterogeneous collection
1898 }
1899 }
1900 break;
1901 default:
1902 if (src != 0 || dest != 0) {
1903 err = "adapter has spurious src/dest conversion subfields"; break;
1904 }
1905 break;
1906 }
1907 }
1909 if (err == NULL) {
1910 // Check the stack_move subfield.
1911 // It must always report the net change in stack size, positive or negative.
1912 int slots_pushed = stack_move / stack_move_unit();
1913 switch (ek) {
1914 case _adapter_prim_to_prim:
1915 case _adapter_ref_to_prim:
1916 case _adapter_prim_to_ref:
1917 if (slots_pushed != type2size[dest] - type2size[src]) {
1918 err = "wrong stack motion for primitive conversion";
1919 }
1920 break;
1921 case _adapter_dup_args:
1922 if (slots_pushed <= 0) {
1923 err = "adapter requires conversion subfield slots_pushed > 0";
1924 }
1925 break;
1926 case _adapter_drop_args:
1927 if (slots_pushed >= 0) {
1928 err = "adapter requires conversion subfield slots_pushed < 0";
1929 }
1930 break;
1931 case _adapter_collect_args:
1932 if (slots_pushed > 1) {
1933 err = "adapter requires conversion subfield slots_pushed <= 1";
1934 }
1935 break;
1936 case _adapter_spread_args:
1937 if (slots_pushed < -1) {
1938 err = "adapter requires conversion subfield slots_pushed >= -1";
1939 }
1940 break;
1941 default:
1942 if (stack_move != 0) {
1943 err = "adapter has spurious stack_move conversion subfield";
1944 }
1945 break;
1946 }
1947 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) {
1948 err = "stack_move conversion subfield must be multiple of stack_move_unit";
1949 }
1950 }
1952 if (err == NULL) {
1953 // Make sure this adapter does not push too deeply.
1954 int slots_pushed = stack_move / stack_move_unit();
1955 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh());
1956 int target_vmslots = java_lang_invoke_MethodHandle::vmslots(target());
1957 if (slots_pushed != (target_vmslots - this_vmslots)) {
1958 err = "stack_move inconsistent with previous and current MethodType vmslots";
1959 } else if (slots_pushed > 0) {
1960 // verify stack_move against MethodHandlePushLimit
1961 int target_pushes = decode_MethodHandle_stack_pushes(target());
1962 // do not blow the stack; use a Java-based adapter if this limit is exceeded
1963 if (slots_pushed + target_pushes > MethodHandlePushLimit) {
1964 err = "adapter pushes too many parameters";
1965 }
1966 }
1968 // While we're at it, check that the stack motion decoder works:
1969 DEBUG_ONLY(int target_pushes = decode_MethodHandle_stack_pushes(target()));
1970 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
1971 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct");
1972 }
1974 if (err == NULL && vminfo != 0) {
1975 switch (ek) {
1976 case _adapter_swap_args:
1977 case _adapter_rot_args:
1978 break; // OK
1979 default:
1980 err = "vminfo subfield is reserved to the JVM";
1981 }
1982 }
1984 // Do additional ad hoc checks.
1985 if (err == NULL) {
1986 switch (ek) {
1987 case _adapter_retype_only:
1988 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false);
1989 break;
1991 case _adapter_retype_raw:
1992 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true);
1993 break;
1995 case _adapter_check_cast:
1996 {
1997 // The actual value being checked must be a reference:
1998 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), argnum),
1999 object_java_mirror(), argnum);
2000 if (err != NULL) break;
2002 // The output of the cast must fit with the destination argument:
2003 Handle cast_class = argument;
2004 err = check_method_type_conversion(src_mtype(),
2005 argnum, cast_class(),
2006 dst_mtype());
2007 }
2008 break;
2010 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles
2011 }
2012 }
2014 if (err != NULL) {
2015 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
2016 return;
2017 }
2019 }
2021 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
2022 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
2023 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
2024 jint conv_op = adapter_conversion_op(conversion);
2026 // adjust the adapter code to the internal EntryKind enumeration:
2027 EntryKind ek_orig = adapter_entry_kind(conv_op);
2028 EntryKind ek_opt = ek_orig; // may be optimized
2030 // Finalize the vmtarget field (Java initialized it to null).
2031 if (!java_lang_invoke_MethodHandle::is_instance(target())) {
2032 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD);
2033 return;
2034 }
2035 java_lang_invoke_AdapterMethodHandle::set_vmtarget(mh(), target());
2037 if (VerifyMethodHandles) {
2038 verify_AdapterMethodHandle(mh, argnum, CHECK);
2039 }
2041 int stack_move = adapter_conversion_stack_move(conversion);
2042 BasicType src = adapter_conversion_src_type(conversion);
2043 BasicType dest = adapter_conversion_dest_type(conversion);
2044 int vminfo = adapter_conversion_vminfo(conversion); // should be zero
2046 const char* err = NULL;
2048 // Now it's time to finish the case analysis and pick a MethodHandleEntry.
2049 switch (ek_orig) {
2050 case _adapter_retype_only:
2051 case _adapter_retype_raw:
2052 case _adapter_check_cast:
2053 case _adapter_dup_args:
2054 case _adapter_drop_args:
2055 // these work fine via general case code
2056 break;
2058 case _adapter_prim_to_prim:
2059 {
2060 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}.
2061 // And, the {float,double} -> {int,long} cases must be handled by Java.
2062 switch (type2size[src] *4+ type2size[dest]) {
2063 case 1 *4+ 1:
2064 assert(src == T_INT || is_subword_type(src), "source is not float");
2065 // Subword-related cases are int -> {boolean,byte,char,short}.
2066 ek_opt = _adapter_opt_i2i;
2067 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2068 break;
2069 case 2 *4+ 1:
2070 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) {
2071 ek_opt = _adapter_opt_l2i;
2072 vminfo = adapter_prim_to_prim_subword_vminfo(dest);
2073 } else if (src == T_DOUBLE && dest == T_FLOAT) {
2074 ek_opt = _adapter_opt_d2f;
2075 } else {
2076 assert(false, "");
2077 }
2078 break;
2079 case 1 *4+ 2:
2080 if (src == T_INT && dest == T_LONG) {
2081 ek_opt = _adapter_opt_i2l;
2082 } else if (src == T_FLOAT && dest == T_DOUBLE) {
2083 ek_opt = _adapter_opt_f2d;
2084 } else {
2085 assert(false, "");
2086 }
2087 break;
2088 default:
2089 assert(false, "");
2090 break;
2091 }
2092 }
2093 break;
2095 case _adapter_ref_to_prim:
2096 {
2097 switch (type2size[dest]) {
2098 case 1:
2099 ek_opt = _adapter_opt_unboxi;
2100 vminfo = adapter_unbox_subword_vminfo(dest);
2101 break;
2102 case 2:
2103 ek_opt = _adapter_opt_unboxl;
2104 break;
2105 default:
2106 assert(false, "");
2107 break;
2108 }
2109 }
2110 break;
2112 case _adapter_prim_to_ref:
2113 goto throw_not_impl; // allocates, hence could block
2115 case _adapter_swap_args:
2116 case _adapter_rot_args:
2117 {
2118 int swap_slots = type2size[src];
2119 int slot_limit = java_lang_invoke_AdapterMethodHandle::vmslots(mh());
2120 int src_slot = argslot;
2121 int dest_slot = vminfo;
2122 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1;
2123 switch (swap_slots) {
2124 case 1:
2125 ek_opt = (!rotate ? _adapter_opt_swap_1 :
2126 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down);
2127 break;
2128 case 2:
2129 ek_opt = (!rotate ? _adapter_opt_swap_2 :
2130 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down);
2131 break;
2132 default:
2133 assert(false, "");
2134 break;
2135 }
2136 }
2137 break;
2139 case _adapter_collect_args:
2140 goto throw_not_impl; // allocates, hence could block
2142 case _adapter_spread_args:
2143 {
2144 // vminfo will be the required length of the array
2145 int slots_pushed = stack_move / stack_move_unit();
2146 int array_size = slots_pushed + 1;
2147 assert(array_size >= 0, "");
2148 vminfo = array_size;
2149 switch (array_size) {
2150 case 0: ek_opt = _adapter_opt_spread_0; break;
2151 case 1: ek_opt = _adapter_opt_spread_1; break;
2152 default: ek_opt = _adapter_opt_spread_more; break;
2153 }
2154 if ((vminfo & CONV_VMINFO_MASK) != vminfo)
2155 goto throw_not_impl; // overflow
2156 }
2157 break;
2159 case _adapter_flyby:
2160 case _adapter_ricochet:
2161 goto throw_not_impl; // runs Java code, hence could block
2163 default:
2164 // should have failed much earlier; must be a missing case here
2165 assert(false, "incomplete switch");
2166 // and fall through:
2168 throw_not_impl:
2169 // FIXME: these adapters are NYI
2170 err = "adapter not yet implemented in the JVM";
2171 break;
2172 }
2174 if (err != NULL) {
2175 throw_InternalError_for_bad_conversion(conversion, err, THREAD);
2176 return;
2177 }
2179 // Rebuild the conversion value; maybe parts of it were changed.
2180 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo);
2182 // Finalize the conversion field. (Note that it is final to Java code.)
2183 java_lang_invoke_AdapterMethodHandle::set_conversion(mh(), new_conversion);
2185 // Done!
2186 java_lang_invoke_MethodHandle::set_vmentry(mh(), entry(ek_opt));
2188 // There should be enough memory barriers on exit from native methods
2189 // to ensure that the MH is fully initialized to all threads before
2190 // Java code can publish it in global data structures.
2191 }
2193 //
2194 // Here are the native methods on sun.invoke.MethodHandleImpl.
2195 // They are the private interface between this JVM and the HotSpot-specific
2196 // Java code that implements JSR 292 method handles.
2197 //
2198 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
2199 // that intrinsic (non-JNI) native methods are defined in HotSpot.
2200 //
2202 // direct method handles for invokestatic or invokespecial
2203 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller);
2204 JVM_ENTRY(void, MHN_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2205 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) {
2206 ResourceMark rm; // for error messages
2208 // This is the guy we are initializing:
2209 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2210 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2212 // Early returns out of this method leave the DMH in an unfinished state.
2213 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2215 // which method are we really talking about?
2216 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2217 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2218 if (java_lang_invoke_MemberName::is_instance(target()) &&
2219 java_lang_invoke_MemberName::vmindex(target()) == VM_INDEX_UNINITIALIZED) {
2220 MethodHandles::resolve_MemberName(target, CHECK);
2221 }
2223 KlassHandle receiver_limit; int decode_flags = 0;
2224 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags);
2225 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); }
2227 // The trusted Java code that calls this method should already have performed
2228 // access checks on behalf of the given caller. But, we can verify this.
2229 if (VerifyMethodHandles && caller_jh != NULL) {
2230 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)));
2231 // If this were a bytecode, the first access check would be against
2232 // the "reference class" mentioned in the CONSTANT_Methodref.
2233 // We don't know at this point which class that was, and if we
2234 // check against m.method_holder we might get the wrong answer.
2235 // So we just make sure to handle this check when the resolution
2236 // happens, when we call resolve_MemberName.
2237 //
2238 // (A public class can inherit public members from private supers,
2239 // and it would be wrong to check access against the private super
2240 // if the original symbolic reference was against the public class.)
2241 //
2242 // If there were a bytecode, the next step would be to lookup the method
2243 // in the reference class, then then check the method's access bits.
2244 // Emulate LinkResolver::check_method_accessability.
2245 klassOop resolved_klass = m->method_holder();
2246 if (!Reflection::verify_field_access(caller->as_klassOop(),
2247 resolved_klass, resolved_klass,
2248 m->access_flags(),
2249 true)) {
2250 // %%% following cutout belongs in Reflection::verify_field_access?
2251 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(),
2252 resolved_klass, THREAD);
2253 if (!same_pm) {
2254 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string());
2255 }
2256 }
2257 }
2259 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK);
2260 }
2261 JVM_END
2263 // bound method handles
2264 JVM_ENTRY(void, MHN_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2265 jobject target_jh, int argnum)) {
2266 ResourceMark rm; // for error messages
2268 // This is the guy we are initializing:
2269 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2270 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2272 // Early returns out of this method leave the BMH in an unfinished state.
2273 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2275 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2276 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2278 if (!java_lang_invoke_MethodHandle::is_instance(target())) {
2279 // Target object is a reflective method. (%%% Do we need this alternate path?)
2280 Untested("init_BMH of non-MH");
2281 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); }
2282 KlassHandle receiver_limit; int decode_flags = 0;
2283 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags);
2284 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m,
2285 receiver_limit,
2286 decode_flags,
2287 CHECK);
2288 return;
2289 }
2291 // Build a BMH on top of a DMH or another BMH:
2292 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK);
2293 }
2294 JVM_END
2296 // adapter method handles
2297 JVM_ENTRY(void, MHN_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh,
2298 jobject target_jh, int argnum)) {
2299 // This is the guy we are initializing:
2300 if (mh_jh == NULL || target_jh == NULL) {
2301 THROW(vmSymbols::java_lang_InternalError());
2302 }
2303 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
2304 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
2306 // Early returns out of this method leave the AMH in an unfinished state.
2307 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
2309 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK);
2310 }
2311 JVM_END
2313 // method type forms
2314 JVM_ENTRY(void, MHN_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) {
2315 if (erased_jh == NULL) return;
2316 if (TraceMethodHandles) {
2317 tty->print("creating MethodType form ");
2318 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH!
2319 // call Object.toString()
2320 Symbol* name = vmSymbols::toString_name();
2321 Symbol* sig = vmSymbols::void_string_signature();
2322 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh)));
2323 JavaValue result(T_OBJECT);
2324 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig,
2325 &args, CHECK);
2326 Handle str(THREAD, (oop)result.get_jobject());
2327 java_lang_String::print(str, tty);
2328 }
2329 tty->cr();
2330 }
2331 }
2332 JVM_END
2334 // debugging and reflection
2335 JVM_ENTRY(jobject, MHN_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) {
2336 Handle mh(THREAD, JNIHandles::resolve(mh_jh));
2337 if (!java_lang_invoke_MethodHandle::is_instance(mh())) {
2338 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
2339 }
2340 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL);
2341 return JNIHandles::make_local(THREAD, target);
2342 }
2343 JVM_END
2345 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
2346 switch (which) {
2347 case MethodHandles::GC_JVM_PUSH_LIMIT:
2348 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF,
2349 "MethodHandlePushLimit parameter must be in valid range");
2350 return MethodHandlePushLimit;
2351 case MethodHandles::GC_JVM_STACK_MOVE_UNIT:
2352 // return number of words per slot, signed according to stack direction
2353 return MethodHandles::stack_move_unit();
2354 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK:
2355 return MethodHandles::adapter_conversion_ops_supported_mask();
2356 }
2357 return 0;
2358 }
2359 JVM_END
2361 #ifndef PRODUCT
2362 #define EACH_NAMED_CON(template) \
2363 template(MethodHandles,GC_JVM_PUSH_LIMIT) \
2364 template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) \
2365 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \
2366 template(MethodHandles,ETF_DIRECT_HANDLE) \
2367 template(MethodHandles,ETF_METHOD_NAME) \
2368 template(MethodHandles,ETF_REFLECT_METHOD) \
2369 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
2370 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
2371 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
2372 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
2373 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
2374 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
2375 template(java_lang_invoke_MemberName,VM_INDEX_UNINITIALIZED) \
2376 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_ONLY) \
2377 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_RAW) \
2378 template(java_lang_invoke_AdapterMethodHandle,OP_CHECK_CAST) \
2379 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_PRIM) \
2380 template(java_lang_invoke_AdapterMethodHandle,OP_REF_TO_PRIM) \
2381 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_REF) \
2382 template(java_lang_invoke_AdapterMethodHandle,OP_SWAP_ARGS) \
2383 template(java_lang_invoke_AdapterMethodHandle,OP_ROT_ARGS) \
2384 template(java_lang_invoke_AdapterMethodHandle,OP_DUP_ARGS) \
2385 template(java_lang_invoke_AdapterMethodHandle,OP_DROP_ARGS) \
2386 template(java_lang_invoke_AdapterMethodHandle,OP_COLLECT_ARGS) \
2387 template(java_lang_invoke_AdapterMethodHandle,OP_SPREAD_ARGS) \
2388 template(java_lang_invoke_AdapterMethodHandle,OP_FLYBY) \
2389 template(java_lang_invoke_AdapterMethodHandle,OP_RICOCHET) \
2390 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_LIMIT) \
2391 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_MASK) \
2392 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_MASK) \
2393 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_SHIFT) \
2394 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_SHIFT) \
2395 template(java_lang_invoke_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \
2396 template(java_lang_invoke_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \
2397 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \
2398 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \
2399 /*end*/
2401 #define ONE_PLUS(scope,value) 1+
2402 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0;
2403 #define VALUE_COMMA(scope,value) scope::value,
2404 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 };
2405 #define STRING_NULL(scope,value) #value "\0"
2406 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) };
2408 #undef ONE_PLUS
2409 #undef VALUE_COMMA
2410 #undef STRING_NULL
2411 #undef EACH_NAMED_CON
2412 #endif
2414 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
2415 #ifndef PRODUCT
2416 if (which >= 0 && which < con_value_count) {
2417 int con = con_values[which];
2418 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
2419 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
2420 const char* str = &con_names[0];
2421 for (int i = 0; i < which; i++)
2422 str += strlen(str) + 1; // skip name and null
2423 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
2424 box->obj_at_put(0, name);
2425 }
2426 return con;
2427 }
2428 #endif
2429 return 0;
2430 }
2431 JVM_END
2433 // void init(MemberName self, AccessibleObject ref)
2434 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
2435 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2436 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2437 oop target_oop = JNIHandles::resolve_non_null(target_jh);
2438 MethodHandles::init_MemberName(mname(), target_oop);
2439 }
2440 JVM_END
2442 // void expand(MemberName self)
2443 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
2444 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2445 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2446 MethodHandles::expand_MemberName(mname, 0, CHECK);
2447 }
2448 JVM_END
2450 // void resolve(MemberName self, Class<?> caller)
2451 JVM_ENTRY(void, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
2452 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
2453 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
2455 // The trusted Java code that calls this method should already have performed
2456 // access checks on behalf of the given caller. But, we can verify this.
2457 if (VerifyMethodHandles && caller_jh != NULL) {
2458 klassOop reference_klass = java_lang_Class::as_klassOop(java_lang_invoke_MemberName::clazz(mname()));
2459 if (reference_klass != NULL) {
2460 // Emulate LinkResolver::check_klass_accessability.
2461 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh));
2462 if (!Reflection::verify_class_access(caller,
2463 reference_klass,
2464 true)) {
2465 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name());
2466 }
2467 }
2468 }
2470 MethodHandles::resolve_MemberName(mname, CHECK);
2471 }
2472 JVM_END
2474 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
2475 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
2476 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
2477 jclass clazz_jh, jstring name_jh, jstring sig_jh,
2478 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
2479 if (clazz_jh == NULL || results_jh == NULL) return -1;
2480 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)));
2482 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
2483 if (results.is_null() || !results->is_objArray()) return -1;
2485 TempNewSymbol name = NULL;
2486 TempNewSymbol sig = NULL;
2487 if (name_jh != NULL) {
2488 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
2489 if (name == NULL) return 0; // a match is not possible
2490 }
2491 if (sig_jh != NULL) {
2492 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
2493 if (sig == NULL) return 0; // a match is not possible
2494 }
2496 KlassHandle caller;
2497 if (caller_jh != NULL) {
2498 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
2499 if (!java_lang_Class::is_instance(caller_oop)) return -1;
2500 caller = KlassHandle(THREAD, java_lang_Class::as_klassOop(caller_oop));
2501 }
2503 if (name != NULL && sig != NULL && results.not_null()) {
2504 // try a direct resolve
2505 // %%% TO DO
2506 }
2508 int res = MethodHandles::find_MemberNames(k(), name, sig, mflags,
2509 caller(), skip, results());
2510 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
2511 return res;
2512 }
2513 JVM_END
2516 /// JVM_RegisterMethodHandleMethods
2518 #define LANG "Ljava/lang/"
2519 #define JLINV "Ljava/lang/invoke/"
2521 #define OBJ LANG"Object;"
2522 #define CLS LANG"Class;"
2523 #define STRG LANG"String;"
2524 #define MT JLINV"MethodType;"
2525 #define MH JLINV"MethodHandle;"
2526 #define MEM JLINV"MemberName;"
2527 #define AMH JLINV"AdapterMethodHandle;"
2528 #define BMH JLINV"BoundMethodHandle;"
2529 #define DMH JLINV"DirectMethodHandle;"
2531 #define CC (char*) /*cast a literal from (const char*)*/
2532 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
2534 // These are the native methods on sun.invoke.MethodHandleNatives.
2535 static JNINativeMethod methods[] = {
2536 // void init(MemberName self, AccessibleObject ref)
2537 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHN_init_AMH)},
2538 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHN_init_BMH)},
2539 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHN_init_DMH)},
2540 {CC"init", CC"("MT")V", FN_PTR(MHN_init_MT)},
2541 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
2542 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
2543 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHN_resolve_Mem)},
2544 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHN_getTarget)},
2545 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
2546 // static native int getNamedCon(int which, Object[] name)
2547 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
2548 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
2549 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
2550 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}
2551 };
2553 // This one function is exported, used by NativeLookup.
2555 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
2556 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK");
2558 if (!EnableInvokeDynamic) {
2559 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
2560 return; // bind nothing
2561 }
2563 bool enable_MH = true;
2565 {
2566 ThreadToNativeFromVM ttnfv(thread);
2568 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod));
2569 if (env->ExceptionOccurred()) {
2570 MethodHandles::set_enabled(false);
2571 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
2572 enable_MH = false;
2573 env->ExceptionClear();
2574 }
2575 }
2577 if (enable_MH) {
2578 KlassHandle MHN_klass = SystemDictionaryHandles::MethodHandleNatives_klass();
2579 if (MHN_klass.not_null()) {
2580 TempNewSymbol raiseException_name = SymbolTable::new_symbol("raiseException", CHECK);
2581 TempNewSymbol raiseException_sig = SymbolTable::new_symbol("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK);
2582 methodOop raiseException_method = instanceKlass::cast(MHN_klass->as_klassOop())
2583 ->find_method(raiseException_name, raiseException_sig);
2584 if (raiseException_method != NULL && raiseException_method->is_static()) {
2585 MethodHandles::set_raise_exception_method(raiseException_method);
2586 } else {
2587 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
2588 enable_MH = false;
2589 }
2590 } else {
2591 enable_MH = false;
2592 }
2593 }
2595 if (enable_MH) {
2596 MethodHandles::generate_adapters();
2597 MethodHandles::set_enabled(true);
2598 }
2599 }
2600 JVM_END