1 /*
2 * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "compiler/compileBroker.hpp"
28 #include "interpreter/interpreter.hpp"
29 #include "interpreter/oopMapCache.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "prims/jvmtiRedefineClassesTrace.hpp"
33 #include "prims/methodHandles.hpp"
34 #include "runtime/compilationPolicy.hpp"
35 #include "runtime/javaCalls.hpp"
36 #include "runtime/reflection.hpp"
37 #include "runtime/signature.hpp"
38 #include "runtime/stubRoutines.hpp"
39
40
41 /*
42 * JSR 292 reference implementation: method handles
43 * The JDK 7 reference implementation represented method handle
44 * combinations as chains. Each link in the chain had a "vmentry"
45 * field which pointed at a bit of assembly code which performed
46 * one transformation before dispatching to the next link in the chain.
47 *
48 * The current reference implementation pushes almost all code generation
49 * responsibility to (trusted) Java code. A method handle contains a
50 * pointer to its "LambdaForm", which embodies all details of the method
51 * handle's behavior. The LambdaForm is a normal Java object, managed
52 * by a runtime coded in Java.
53 */
54
55 bool MethodHandles::_enabled = false; // set true after successful native linkage
56 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
57
58 //------------------------------------------------------------------------------
59 // MethodHandles::generate_adapters
60 //
61 void MethodHandles::generate_adapters() {
62 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
63
64 assert(_adapter_code == NULL, "generate only once");
65
66 ResourceMark rm;
67 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
68 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
69 if (_adapter_code == NULL)
70 vm_exit_out_of_memory(adapter_code_size, OOM_MALLOC_ERROR,
71 "CodeCache: no room for MethodHandles adapters");
72 {
73 CodeBuffer code(_adapter_code);
74 MethodHandlesAdapterGenerator g(&code);
75 g.generate();
76 code.log_section_sizes("MethodHandlesAdapterBlob");
77 }
78 }
79
80 //------------------------------------------------------------------------------
81 // MethodHandlesAdapterGenerator::generate
82 //
83 void MethodHandlesAdapterGenerator::generate() {
84 // Generate generic method handle adapters.
85 // Generate interpreter entries
86 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
87 mk <= Interpreter::method_handle_invoke_LAST;
88 mk = Interpreter::MethodKind(1 + (int)mk)) {
89 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
90 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
91 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
92 if (entry != NULL) {
93 Interpreter::set_entry_for_kind(mk, entry);
94 }
95 // If the entry is not set, it will throw AbstractMethodError.
96 }
97 }
98
99 void MethodHandles::set_enabled(bool z) {
100 if (_enabled != z) {
101 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
102 _enabled = z;
103 }
104 }
105
106 // MemberName support
107
108 // import java_lang_invoke_MemberName.*
109 enum {
110 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
111 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
112 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
113 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
114 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
115 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
116 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
117 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
118 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
119 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
120 };
121
122 Handle MethodHandles::new_MemberName(TRAPS) {
123 Handle empty;
124 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
125 if (!k->is_initialized()) k->initialize(CHECK_(empty));
126 return Handle(THREAD, k->allocate_instance(THREAD));
127 }
128
129 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
130 // This method is used from java.lang.invoke.MemberName constructors.
131 // It fills in the new MemberName from a java.lang.reflect.Member.
132 Thread* thread = Thread::current();
133 oop target_oop = target();
134 Klass* target_klass = target_oop->klass();
135 if (target_klass == SystemDictionary::reflect_Field_klass()) {
136 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
137 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
138 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
139 if (!k.is_null() && k->oop_is_instance()) {
140 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
141 oop mname2 = init_field_MemberName(mname, fd);
142 if (mname2 != NULL) {
143 // Since we have the reified name and type handy, add them to the result.
144 if (java_lang_invoke_MemberName::name(mname2) == NULL)
145 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
146 if (java_lang_invoke_MemberName::type(mname2) == NULL)
147 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
148 }
149 return mname2;
150 }
151 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
152 oop clazz = java_lang_reflect_Method::clazz(target_oop);
153 int slot = java_lang_reflect_Method::slot(target_oop);
154 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
155 if (!k.is_null() && k->oop_is_instance()) {
156 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
157 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
158 return NULL; // do not resolve unless there is a concrete signature
159 CallInfo info(m, k());
160 return init_method_MemberName(mname, info);
161 }
162 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
163 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
164 int slot = java_lang_reflect_Constructor::slot(target_oop);
165 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
166 if (!k.is_null() && k->oop_is_instance()) {
167 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
168 if (m == NULL) return NULL;
169 CallInfo info(m, k());
170 return init_method_MemberName(mname, info);
171 }
172 }
173 return NULL;
174 }
175
176 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
177 assert(info.resolved_appendix().is_null(), "only normal methods here");
178 KlassHandle receiver_limit = info.resolved_klass();
179 methodHandle m = info.resolved_method();
180 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
181 int vmindex = Method::invalid_vtable_index;
182
183 switch (info.call_kind()) {
184 case CallInfo::itable_call:
185 vmindex = info.itable_index();
186 // More importantly, the itable index only works with the method holder.
187 receiver_limit = m->method_holder();
188 assert(receiver_limit->verify_itable_index(vmindex), "");
189 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
190 break;
191
192 case CallInfo::vtable_call:
193 vmindex = info.vtable_index();
194 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
195 assert(receiver_limit->is_subtype_of(m->method_holder()), "virtual call must be type-safe");
196 break;
197
198 case CallInfo::direct_call:
199 vmindex = Method::nonvirtual_vtable_index;
200 if (m->is_static()) {
201 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
202 } else if (m->is_initializer()) {
203 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
204 assert(receiver_limit == m->method_holder(), "constructor call must be exactly typed");
205 } else {
206 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
207 assert(receiver_limit->is_subtype_of(m->method_holder()), "special call must be type-safe");
208 }
209 break;
210
211 default: assert(false, "bad CallInfo"); return NULL;
212 }
213
214 // @CallerSensitive annotation detected
215 if (m->caller_sensitive()) {
216 flags |= CALLER_SENSITIVE;
217 }
218
219 oop mname_oop = mname();
220 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
221 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
222 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
223 java_lang_invoke_MemberName::set_clazz( mname_oop, receiver_limit->java_mirror());
224 // Note: name and type can be lazily computed by resolve_MemberName,
225 // if Java code needs them as resolved String and MethodType objects.
226 // The clazz must be eagerly stored, because it provides a GC
227 // root to help keep alive the Method*.
228 // If relevant, the vtable or itable value is stored as vmindex.
229 // This is done eagerly, since it is readily available without
230 // constructing any new objects.
231 // TO DO: maybe intern mname_oop
232 m->method_holder()->add_member_name(m->method_idnum(), mname);
233
234 return mname();
235 }
236
237 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
238 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
239 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
240 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
241 Metadata* vmtarget = fd.field_holder();
242 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
243 oop mname_oop = mname();
244 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
245 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
246 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
247 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
248 oop type = field_signature_type_or_null(fd.signature());
249 oop name = field_name_or_null(fd.name());
250 if (name != NULL)
251 java_lang_invoke_MemberName::set_name(mname_oop, name);
252 if (type != NULL)
253 java_lang_invoke_MemberName::set_type(mname_oop, type);
254 // Note: name and type can be lazily computed by resolve_MemberName,
255 // if Java code needs them as resolved String and Class objects.
256 // Note that the incoming type oop might be pre-resolved (non-null).
257 // The base clazz and field offset (vmindex) must be eagerly stored,
258 // because they unambiguously identify the field.
259 // Although the fieldDescriptor::_index would also identify the field,
260 // we do not use it, because it is harder to decode.
261 // TO DO: maybe intern mname_oop
262 return mname();
263 }
264
265 // JVM 2.9 Special Methods:
266 // A method is signature polymorphic if and only if all of the following conditions hold :
267 // * It is declared in the java.lang.invoke.MethodHandle class.
268 // * It has a single formal parameter of type Object[].
269 // * It has a return type of Object.
270 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
271 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
272 if (klass == NULL)
273 return false;
274 // The following test will fail spuriously during bootstrap of MethodHandle itself:
275 // if (klass != SystemDictionary::MethodHandle_klass())
276 // Test the name instead:
277 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
278 return false;
279 Symbol* poly_sig = vmSymbols::object_array_object_signature();
280 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
281 if (m == NULL) return false;
282 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
283 int flags = m->access_flags().as_int();
284 return (flags & required) == required;
285 }
286
287
288 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
289 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
290 switch (iid) {
291 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
292 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
293 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
294 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
295 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
296 }
297 assert(false, "");
298 return 0;
299 }
300
301 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
302 switch (iid) {
303 case vmIntrinsics::_invokeBasic: return 0;
304 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
305 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
306 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
307 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
308 }
309 assert(false, err_msg("iid=%d", iid));
310 return 0;
311 }
312
313 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
314 vmSymbols::SID name_id = vmSymbols::find_sid(name);
315 switch (name_id) {
316 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
317 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
318 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
319 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
320
321 // There is one static signature-polymorphic method for each JVM invocation mode.
322 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
323 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
324 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
325 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
326 }
327
328 // Cover the case of invokeExact and any future variants of invokeFoo.
329 Klass* mh_klass = SystemDictionary::well_known_klass(
330 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
331 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
332 return vmIntrinsics::_invokeGeneric;
333
334 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
335 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
336 return vmIntrinsics::_none;
337 }
338
339 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
340 if (klass != NULL &&
341 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
342 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
343 if (iid != vmIntrinsics::_none)
344 return iid;
345 if (is_method_handle_invoke_name(klass, name))
346 return vmIntrinsics::_invokeGeneric;
347 }
348 return vmIntrinsics::_none;
349 }
350
351
352 // convert the external string or reflective type to an internal signature
353 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
354 if (java_lang_invoke_MethodType::is_instance(type_str)) {
355 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
356 } else if (java_lang_Class::is_instance(type_str)) {
357 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
358 } else if (java_lang_String::is_instance(type_str)) {
359 if (intern_if_not_found) {
360 return java_lang_String::as_symbol(type_str, CHECK_NULL);
361 } else {
362 return java_lang_String::as_symbol_or_null(type_str);
363 }
364 } else {
365 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
366 }
367 }
368
369 static const char OBJ_SIG[] = "Ljava/lang/Object;";
370 enum { OBJ_SIG_LEN = 18 };
371
372 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
373 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
374 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
375 const int len = sig->utf8_length();
376 for (int i = 0; i < len; i++) {
377 switch (sig->byte_at(i)) {
378 case 'L':
379 // only java/lang/Object is valid here
380 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
381 return false;
382 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
383 continue;
384 case '(': case ')': case 'V':
385 case 'I': case 'J': case 'F': case 'D':
386 continue;
387 //case '[':
388 //case 'Z': case 'B': case 'C': case 'S':
389 default:
390 return false;
391 }
392 }
393 return true;
394 }
395
396 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
397 Symbol* bsig = NULL;
398 if (sig == NULL) {
399 return sig;
400 } else if (is_basic_type_signature(sig)) {
401 sig->increment_refcount();
402 return sig; // that was easy
403 } else if (sig->byte_at(0) != '(') {
404 BasicType bt = char2type(sig->byte_at(0));
405 if (is_subword_type(bt)) {
406 bsig = vmSymbols::int_signature();
407 } else {
408 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
409 bsig = vmSymbols::object_signature();
410 }
411 } else {
412 ResourceMark rm;
413 stringStream buffer(128);
414 buffer.put('(');
415 int arg_pos = 0, keep_arg_pos = -1;
416 if (keep_last_arg)
417 keep_arg_pos = ArgumentCount(sig).size() - 1;
418 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
419 BasicType bt = ss.type();
420 size_t this_arg_pos = buffer.size();
421 if (ss.at_return_type()) {
422 buffer.put(')');
423 }
424 if (arg_pos == keep_arg_pos) {
425 buffer.write((char*) ss.raw_bytes(),
426 (int) ss.raw_length());
427 } else if (bt == T_OBJECT || bt == T_ARRAY) {
428 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
429 } else {
430 if (is_subword_type(bt))
431 bt = T_INT;
432 buffer.put(type2char(bt));
433 }
434 arg_pos++;
435 }
436 const char* sigstr = buffer.base();
437 int siglen = (int) buffer.size();
438 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
439 }
440 assert(is_basic_type_signature(bsig) ||
441 // detune assert in case the injected argument is not a basic type:
442 keep_last_arg, "");
443 return bsig;
444 }
445
446 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
447 Symbol* sig,
448 bool keep_arrays,
449 bool keep_basic_names) {
450 st = st ? st : tty;
451 int len = sig->utf8_length();
452 int array = 0;
453 bool prev_type = false;
454 for (int i = 0; i < len; i++) {
455 char ch = sig->byte_at(i);
456 switch (ch) {
457 case '(': case ')':
458 prev_type = false;
459 st->put(ch);
460 continue;
461 case '[':
462 if (!keep_basic_names && keep_arrays)
463 st->put(ch);
464 array++;
465 continue;
466 case 'L':
467 {
468 if (prev_type) st->put(',');
469 int start = i+1, slash = start;
470 while (++i < len && (ch = sig->byte_at(i)) != ';') {
471 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
472 }
473 if (slash < i) start = slash;
474 if (!keep_basic_names) {
475 st->put('L');
476 } else {
477 for (int j = start; j < i; j++)
478 st->put(sig->byte_at(j));
479 prev_type = true;
480 }
481 break;
482 }
483 default:
484 {
485 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
486 ch = '[';
487 array = 0;
488 }
489 if (prev_type) st->put(',');
490 const char* n = NULL;
491 if (keep_basic_names)
492 n = type2name(char2type(ch));
493 if (n == NULL) {
494 // unknown letter, or we don't want to know its name
495 st->put(ch);
496 } else {
497 st->print(n);
498 prev_type = true;
499 }
500 break;
501 }
502 }
503 // Switch break goes here to take care of array suffix:
504 if (prev_type) {
505 while (array > 0) {
506 st->print("[]");
507 --array;
508 }
509 }
510 array = 0;
511 }
512 }
513
514
515
516 static oop object_java_mirror() {
517 return SystemDictionary::Object_klass()->java_mirror();
518 }
519
520 oop MethodHandles::field_name_or_null(Symbol* s) {
521 if (s == NULL) return NULL;
522 return StringTable::lookup(s);
523 }
524
525 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
526 if (s == NULL) return NULL;
527 BasicType bt = FieldType::basic_type(s);
528 if (is_java_primitive(bt)) {
529 assert(s->utf8_length() == 1, "");
530 return java_lang_Class::primitive_mirror(bt);
531 }
532 // Here are some more short cuts for common types.
533 // They are optional, since reference types can be resolved lazily.
534 if (bt == T_OBJECT) {
535 if (s == vmSymbols::object_signature()) {
536 return object_java_mirror();
537 } else if (s == vmSymbols::class_signature()) {
538 return SystemDictionary::Class_klass()->java_mirror();
539 } else if (s == vmSymbols::string_signature()) {
540 return SystemDictionary::String_klass()->java_mirror();
541 }
542 }
543 return NULL;
544 }
545
546
547 // An unresolved member name is a mere symbolic reference.
548 // Resolving it plants a vmtarget/vmindex in it,
549 // which refers directly to JVM internals.
550 Handle MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
551 Handle empty;
552 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
553
554 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
555 // Already resolved.
556 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
557 assert(vmindex >= Method::nonvirtual_vtable_index, "");
558 return mname;
559 }
560
561 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
562 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
563 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
564 int flags = java_lang_invoke_MemberName::flags(mname());
565 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
566 if (!ref_kind_is_valid(ref_kind)) {
567 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
568 }
569
570 DEBUG_ONLY(int old_vmindex);
571 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
572
573 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
574 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
575 }
576
577 instanceKlassHandle defc;
578 {
579 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
580 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
581 if (!defc_klass->oop_is_instance()) {
582 if (!defc_klass->oop_is_array()) return empty;
583 defc_klass = SystemDictionary::Object_klass();
584 }
585 defc = instanceKlassHandle(THREAD, defc_klass);
586 }
587 if (defc.is_null()) {
588 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
589 }
590 defc->link_class(CHECK_(empty)); // possible safepoint
591
592 // convert the external string name to an internal symbol
593 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
594 if (name == NULL) return empty; // no such name
595 if (name == vmSymbols::class_initializer_name())
596 return empty; // illegal name
597
598 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
599 if ((flags & ALL_KINDS) == IS_METHOD &&
600 (defc() == SystemDictionary::MethodHandle_klass()) &&
601 (ref_kind == JVM_REF_invokeVirtual ||
602 ref_kind == JVM_REF_invokeSpecial ||
603 // static invocation mode is required for _linkToVirtual, etc.:
604 ref_kind == JVM_REF_invokeStatic)) {
605 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
606 if (iid != vmIntrinsics::_none &&
607 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
608 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
609 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
610 mh_invoke_id = iid;
611 }
612 }
613
614 // convert the external string or reflective type to an internal signature
615 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
616 if (type == NULL) return empty; // no such signature exists in the VM
617
618 // Time to do the lookup.
619 switch (flags & ALL_KINDS) {
620 case IS_METHOD:
621 {
622 CallInfo result;
623 {
624 assert(!HAS_PENDING_EXCEPTION, "");
625 if (ref_kind == JVM_REF_invokeStatic) {
626 LinkResolver::resolve_static_call(result,
627 defc, name, type, KlassHandle(), false, false, THREAD);
628 } else if (ref_kind == JVM_REF_invokeInterface) {
629 LinkResolver::resolve_interface_call(result, Handle(), defc,
630 defc, name, type, KlassHandle(), false, false, THREAD);
631 } else if (mh_invoke_id != vmIntrinsics::_none) {
632 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
633 LinkResolver::resolve_handle_call(result,
634 defc, name, type, KlassHandle(), THREAD);
635 } else if (ref_kind == JVM_REF_invokeSpecial) {
636 LinkResolver::resolve_special_call(result,
637 defc, name, type, KlassHandle(), false, THREAD);
638 } else if (ref_kind == JVM_REF_invokeVirtual) {
639 LinkResolver::resolve_virtual_call(result, Handle(), defc,
640 defc, name, type, KlassHandle(), false, false, THREAD);
641 } else {
642 assert(false, err_msg("ref_kind=%d", ref_kind));
643 }
644 if (HAS_PENDING_EXCEPTION) {
645 return empty;
646 }
647 }
648 if (result.resolved_appendix().not_null()) {
649 // The resolved MemberName must not be accompanied by an appendix argument,
650 // since there is no way to bind this value into the MemberName.
651 // Caller is responsible to prevent this from happening.
652 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
653 }
654 oop mname2 = init_method_MemberName(mname, result);
655 return Handle(THREAD, mname2);
656 }
657 case IS_CONSTRUCTOR:
658 {
659 CallInfo result;
660 {
661 assert(!HAS_PENDING_EXCEPTION, "");
662 if (name == vmSymbols::object_initializer_name()) {
663 LinkResolver::resolve_special_call(result,
664 defc, name, type, KlassHandle(), false, THREAD);
665 } else {
666 break; // will throw after end of switch
667 }
668 if (HAS_PENDING_EXCEPTION) {
669 return empty;
670 }
671 }
672 assert(result.is_statically_bound(), "");
673 oop mname2 = init_method_MemberName(mname, result);
674 return Handle(THREAD, mname2);
675 }
676 case IS_FIELD:
677 {
678 fieldDescriptor result; // find_field initializes fd if found
679 {
680 assert(!HAS_PENDING_EXCEPTION, "");
681 LinkResolver::resolve_field(result, defc, name, type, KlassHandle(), Bytecodes::_nop, false, false, THREAD);
682 if (HAS_PENDING_EXCEPTION) {
683 return empty;
684 }
685 }
686 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
687 return Handle(THREAD, mname2);
688 }
689 default:
690 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
691 }
692
693 return empty;
694 }
695
696 // Conversely, a member name which is only initialized from JVM internals
697 // may have null defc, name, and type fields.
698 // Resolving it plants a vmtarget/vmindex in it,
699 // which refers directly to JVM internals.
700 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
701 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
702 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
703 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
704 if (vmtarget == NULL) {
705 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
706 }
707
708 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
709 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
710 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
711 int flags = java_lang_invoke_MemberName::flags(mname());
712
713 if (suppress != 0) {
714 if (suppress & _suppress_defc) have_defc = true;
715 if (suppress & _suppress_name) have_name = true;
716 if (suppress & _suppress_type) have_type = true;
717 }
718
719 if (have_defc && have_name && have_type) return; // nothing needed
720
721 switch (flags & ALL_KINDS) {
722 case IS_METHOD:
723 case IS_CONSTRUCTOR:
724 {
725 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
726 methodHandle m(THREAD, (Method*)vmtarget);
727 DEBUG_ONLY(vmtarget = NULL); // safety
728 if (m.is_null()) break;
729 if (!have_defc) {
730 InstanceKlass* defc = m->method_holder();
731 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
732 }
733 if (!have_name) {
734 //not java_lang_String::create_from_symbol; let's intern member names
735 Handle name = StringTable::intern(m->name(), CHECK);
736 java_lang_invoke_MemberName::set_name(mname(), name());
737 }
738 if (!have_type) {
739 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
740 java_lang_invoke_MemberName::set_type(mname(), type());
741 }
742 return;
743 }
744 case IS_FIELD:
745 {
746 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
747 if (!((Klass*) vmtarget)->oop_is_instance()) break;
748 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
749 DEBUG_ONLY(vmtarget = NULL); // safety
750 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
751 fieldDescriptor fd; // find_field initializes fd if found
752 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
753 break; // cannot expand
754 if (!have_defc) {
755 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
756 }
757 if (!have_name) {
758 //not java_lang_String::create_from_symbol; let's intern member names
759 Handle name = StringTable::intern(fd.name(), CHECK);
760 java_lang_invoke_MemberName::set_name(mname(), name());
761 }
762 if (!have_type) {
763 // If it is a primitive field type, don't mess with short strings like "I".
764 Handle type = field_signature_type_or_null(fd.signature());
765 if (type.is_null()) {
766 java_lang_String::create_from_symbol(fd.signature(), CHECK);
767 }
768 java_lang_invoke_MemberName::set_type(mname(), type());
769 }
770 return;
771 }
772 }
773 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
774 }
775
776 int MethodHandles::find_MemberNames(KlassHandle k,
777 Symbol* name, Symbol* sig,
778 int mflags, KlassHandle caller,
779 int skip, objArrayHandle results) {
780 // %%% take caller into account!
781
782 Thread* thread = Thread::current();
783
784 if (k.is_null() || !k->oop_is_instance()) return -1;
785
786 int rfill = 0, rlimit = results->length(), rskip = skip;
787 // overflow measurement:
788 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
789
790 int match_flags = mflags;
791 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
792 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
793 bool local_only = !(search_superc | search_intfc);
794 bool classes_only = false;
795
796 if (name != NULL) {
797 if (name->utf8_length() == 0) return 0; // a match is not possible
798 }
799 if (sig != NULL) {
800 if (sig->utf8_length() == 0) return 0; // a match is not possible
801 if (sig->byte_at(0) == '(')
802 match_flags &= ~(IS_FIELD | IS_TYPE);
803 else
804 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
805 }
806
807 if ((match_flags & IS_TYPE) != 0) {
808 // NYI, and Core Reflection works quite well for this query
809 }
810
811 if ((match_flags & IS_FIELD) != 0) {
812 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
813 if (name != NULL && st.name() != name)
814 continue;
815 if (sig != NULL && st.signature() != sig)
816 continue;
817 // passed the filters
818 if (rskip > 0) {
819 --rskip;
820 } else if (rfill < rlimit) {
821 Handle result(thread, results->obj_at(rfill++));
822 if (!java_lang_invoke_MemberName::is_instance(result()))
823 return -99; // caller bug!
824 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
825 if (saved != result())
826 results->obj_at_put(rfill-1, saved); // show saved instance to user
827 } else if (++overflow >= overflow_limit) {
828 match_flags = 0; break; // got tired of looking at overflow
829 }
830 }
831 }
832
833 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
834 // watch out for these guys:
835 Symbol* init_name = vmSymbols::object_initializer_name();
836 Symbol* clinit_name = vmSymbols::class_initializer_name();
837 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
838 bool negate_name_test = false;
839 // fix name so that it captures the intention of IS_CONSTRUCTOR
840 if (!(match_flags & IS_METHOD)) {
841 // constructors only
842 if (name == NULL) {
843 name = init_name;
844 } else if (name != init_name) {
845 return 0; // no constructors of this method name
846 }
847 } else if (!(match_flags & IS_CONSTRUCTOR)) {
848 // methods only
849 if (name == NULL) {
850 name = init_name;
851 negate_name_test = true; // if we see the name, we *omit* the entry
852 } else if (name == init_name) {
853 return 0; // no methods of this constructor name
854 }
855 } else {
856 // caller will accept either sort; no need to adjust name
857 }
858 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
859 Method* m = st.method();
860 Symbol* m_name = m->name();
861 if (m_name == clinit_name)
862 continue;
863 if (name != NULL && ((m_name != name) ^ negate_name_test))
864 continue;
865 if (sig != NULL && m->signature() != sig)
866 continue;
867 // passed the filters
868 if (rskip > 0) {
869 --rskip;
870 } else if (rfill < rlimit) {
871 Handle result(thread, results->obj_at(rfill++));
872 if (!java_lang_invoke_MemberName::is_instance(result()))
873 return -99; // caller bug!
874 CallInfo info(m);
875 oop saved = MethodHandles::init_method_MemberName(result, info);
876 if (saved != result())
877 results->obj_at_put(rfill-1, saved); // show saved instance to user
878 } else if (++overflow >= overflow_limit) {
879 match_flags = 0; break; // got tired of looking at overflow
880 }
881 }
882 }
883
884 // return number of elements we at leasted wanted to initialize
885 return rfill + overflow;
886 }
887
888 //------------------------------------------------------------------------------
889 // MemberNameTable
890 //
891
892 MemberNameTable::MemberNameTable(int methods_cnt)
893 : GrowableArray<jweak>(methods_cnt, true) {
894 assert_locked_or_safepoint(MemberNameTable_lock);
895 }
896
897 MemberNameTable::~MemberNameTable() {
898 assert_locked_or_safepoint(MemberNameTable_lock);
899 int len = this->length();
900
901 for (int idx = 0; idx < len; idx++) {
902 jweak ref = this->at(idx);
903 JNIHandles::destroy_weak_global(ref);
904 }
905 }
906
907 void MemberNameTable::add_member_name(int index, jweak mem_name_wref) {
908 assert_locked_or_safepoint(MemberNameTable_lock);
909 this->at_put_grow(index, mem_name_wref);
910 }
911
912 // Return a member name oop or NULL.
913 oop MemberNameTable::get_member_name(int index) {
914 assert_locked_or_safepoint(MemberNameTable_lock);
915
916 jweak ref = this->at(index);
917 oop mem_name = JNIHandles::resolve(ref);
918 return mem_name;
919 }
920
921 #if INCLUDE_JVMTI
922 oop MemberNameTable::find_member_name_by_method(Method* old_method) {
923 assert_locked_or_safepoint(MemberNameTable_lock);
924 oop found = NULL;
925 int len = this->length();
926
927 for (int idx = 0; idx < len; idx++) {
928 oop mem_name = JNIHandles::resolve(this->at(idx));
929 if (mem_name == NULL) {
930 continue;
931 }
932 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
933 if (method == old_method) {
934 found = mem_name;
935 break;
936 }
937 }
938 return found;
939 }
940
941 // It is called at safepoint only
942 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
943 int methods_length, bool *trace_name_printed) {
944 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
945 // search the MemberNameTable for uses of either obsolete or EMCP methods
946 for (int j = 0; j < methods_length; j++) {
947 Method* old_method = old_methods[j];
948 Method* new_method = new_methods[j];
949 oop mem_name = find_member_name_by_method(old_method);
950 if (mem_name != NULL) {
951 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method);
952
953 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
954 if (!(*trace_name_printed)) {
955 // RC_TRACE_MESG macro has an embedded ResourceMark
956 RC_TRACE_MESG(("adjust: name=%s",
957 old_method->method_holder()->external_name()));
958 *trace_name_printed = true;
959 }
960 // RC_TRACE macro has an embedded ResourceMark
961 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
962 new_method->name()->as_C_string(),
963 new_method->signature()->as_C_string()));
964 }
965 }
966 }
967 }
968 #endif // INCLUDE_JVMTI
969
970 //
971 // Here are the native methods in java.lang.invoke.MethodHandleNatives
972 // They are the private interface between this JVM and the HotSpot-specific
973 // Java code that implements JSR 292 method handles.
974 //
975 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
976 // that intrinsic (non-JNI) native methods are defined in HotSpot.
977 //
978
979 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
980 switch (which) {
981 case MethodHandles::GC_COUNT_GWT:
982 #ifdef COMPILER2
983 return true;
984 #else
985 return false;
986 #endif
987 }
988 return 0;
989 }
990 JVM_END
991
992 #ifndef PRODUCT
993 #define EACH_NAMED_CON(template, requirement) \
994 template(MethodHandles,GC_COUNT_GWT) \
995 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
996 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
997 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
998 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
999 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1000 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1001 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1002 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1003 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1004 template(MethodHandles,GC_LAMBDA_SUPPORT) \
1005 /*end*/
1006
1007 #define IGNORE_REQ(req_expr) /* req_expr */
1008 #define ONE_PLUS(scope,value) 1+
1009 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1010 #define VALUE_COMMA(scope,value) scope::value,
1011 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1012 #define STRING_NULL(scope,value) #value "\0"
1013 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1014
1015 static bool advertise_con_value(int which) {
1016 if (which < 0) return false;
1017 bool ok = true;
1018 int count = 0;
1019 #define INC_COUNT(scope,value) \
1020 ++count;
1021 #define CHECK_REQ(req_expr) \
1022 if (which < count) return ok; \
1023 ok = (req_expr);
1024 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1025 #undef INC_COUNT
1026 #undef CHECK_REQ
1027 assert(count == con_value_count, "");
1028 if (which < count) return ok;
1029 return false;
1030 }
1031
1032 #undef ONE_PLUS
1033 #undef VALUE_COMMA
1034 #undef STRING_NULL
1035 #undef EACH_NAMED_CON
1036 #endif // PRODUCT
1037
1038 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1039 #ifndef PRODUCT
1040 if (advertise_con_value(which)) {
1041 assert(which >= 0 && which < con_value_count, "");
1042 int con = con_values[which];
1043 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1044 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1045 const char* str = &con_names[0];
1046 for (int i = 0; i < which; i++)
1047 str += strlen(str) + 1; // skip name and null
1048 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1049 box->obj_at_put(0, name);
1050 }
1051 return con;
1052 }
1053 #endif
1054 return 0;
1055 }
1056 JVM_END
1057
1058 // void init(MemberName self, AccessibleObject ref)
1059 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1060 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1061 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1062 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1063 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1064 MethodHandles::init_MemberName(mname, target);
1065 }
1066 JVM_END
1067
1068 // void expand(MemberName self)
1069 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1070 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1071 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1072 MethodHandles::expand_MemberName(mname, 0, CHECK);
1073 }
1074 JVM_END
1075
1076 // void resolve(MemberName self, Class<?> caller)
1077 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1078 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1079 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1080
1081 // The trusted Java code that calls this method should already have performed
1082 // access checks on behalf of the given caller. But, we can verify this.
1083 if (VerifyMethodHandles && caller_jh != NULL &&
1084 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1085 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1086 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1087 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1088 }
1089
1090 // Reflection::verify_class_access can only handle instance classes.
1091 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1092 // Emulate LinkResolver::check_klass_accessability.
1093 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1094 if (!Reflection::verify_class_access(caller,
1095 reference_klass,
1096 true)) {
1097 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1098 }
1099 }
1100 }
1101
1102 Handle resolved = MethodHandles::resolve_MemberName(mname, CHECK_NULL);
1103 if (resolved.is_null()) {
1104 int flags = java_lang_invoke_MemberName::flags(mname());
1105 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1106 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1107 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1108 }
1109 if ((flags & ALL_KINDS) == IS_FIELD) {
1110 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1111 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1112 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1113 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1114 } else {
1115 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1116 }
1117 }
1118
1119 return JNIHandles::make_local(THREAD, resolved());
1120 }
1121 JVM_END
1122
1123 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1124 if (mname == NULL ||
1125 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1126 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1127 } else {
1128 int flags = java_lang_invoke_MemberName::flags(mname);
1129 if ((flags & IS_FIELD) != 0 &&
1130 (must_be_static
1131 ? (flags & JVM_ACC_STATIC) != 0
1132 : (flags & JVM_ACC_STATIC) == 0)) {
1133 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1134 return (jlong) vmindex;
1135 }
1136 }
1137 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1138 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1139 return 0;
1140 }
1141
1142 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1143 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1144 }
1145 JVM_END
1146
1147 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1148 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1149 }
1150 JVM_END
1151
1152 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1153 // use the other function to perform sanity checks:
1154 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1155 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1156 return JNIHandles::make_local(THREAD, clazz);
1157 }
1158 JVM_END
1159
1160 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1161 if (mname_jh == NULL) return NULL;
1162 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1163 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1164 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1165 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1166 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1167 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1168 result->obj_at_put(0, x);
1169 x = NULL;
1170 if (vmtarget == NULL) {
1171 x = NULL;
1172 } else if (vmtarget->is_klass()) {
1173 x = ((Klass*) vmtarget)->java_mirror();
1174 } else if (vmtarget->is_method()) {
1175 Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL);
1176 CallInfo info((Method*)vmtarget);
1177 x = MethodHandles::init_method_MemberName(mname2, info);
1178 }
1179 result->obj_at_put(1, x);
1180 return JNIHandles::make_local(env, result());
1181 }
1182 JVM_END
1183
1184
1185
1186 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1187 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1188 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1189 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1190 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1191 if (clazz_jh == NULL || results_jh == NULL) return -1;
1192 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1193
1194 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1195 if (results.is_null() || !results->is_objArray()) return -1;
1196
1197 TempNewSymbol name = NULL;
1198 TempNewSymbol sig = NULL;
1199 if (name_jh != NULL) {
1200 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1201 if (name == NULL) return 0; // a match is not possible
1202 }
1203 if (sig_jh != NULL) {
1204 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1205 if (sig == NULL) return 0; // a match is not possible
1206 }
1207
1208 KlassHandle caller;
1209 if (caller_jh != NULL) {
1210 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1211 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1212 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1213 }
1214
1215 if (name != NULL && sig != NULL && results.not_null()) {
1216 // try a direct resolve
1217 // %%% TO DO
1218 }
1219
1220 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1221 caller, skip, results);
1222 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1223 return res;
1224 }
1225 JVM_END
1226
1227 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1228 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1229 Handle target (THREAD, JNIHandles::resolve(target_jh));
1230 {
1231 // Walk all nmethods depending on this call site.
1232 MutexLocker mu(Compile_lock, thread);
1233 Universe::flush_dependents_on(call_site, target);
1234 java_lang_invoke_CallSite::set_target(call_site(), target());
1235 }
1236 }
1237 JVM_END
1238
1239 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1240 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1241 Handle target (THREAD, JNIHandles::resolve(target_jh));
1242 {
1243 // Walk all nmethods depending on this call site.
1244 MutexLocker mu(Compile_lock, thread);
1245 Universe::flush_dependents_on(call_site, target);
1246 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1247 }
1248 }
1249 JVM_END
1250
1251 /**
1252 * Throws a java/lang/UnsupportedOperationException unconditionally.
1253 * This is required by the specification of MethodHandle.invoke if
1254 * invoked directly.
1255 */
1256 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1257 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1258 return NULL;
1259 }
1260 JVM_END
1261
1262 /**
1263 * Throws a java/lang/UnsupportedOperationException unconditionally.
1264 * This is required by the specification of MethodHandle.invokeExact if
1265 * invoked directly.
1266 */
1267 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1268 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1269 return NULL;
1270 }
1271 JVM_END
1272
1273 /// JVM_RegisterMethodHandleMethods
1274
1275 #undef CS // Solaris builds complain
1276
1277 #define LANG "Ljava/lang/"
1278 #define JLINV "Ljava/lang/invoke/"
1279
1280 #define OBJ LANG"Object;"
1281 #define CLS LANG"Class;"
1282 #define STRG LANG"String;"
1283 #define CS JLINV"CallSite;"
1284 #define MT JLINV"MethodType;"
1285 #define MH JLINV"MethodHandle;"
1286 #define MEM JLINV"MemberName;"
1287
1288 #define CC (char*) /*cast a literal from (const char*)*/
1289 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1290
1291 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1292 static JNINativeMethod MHN_methods[] = {
1293 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1294 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1295 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1296 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1297 // static native int getNamedCon(int which, Object[] name)
1298 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1299 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1300 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1301 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1302 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1303 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1304 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1305 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1306 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1307 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1308 };
1309
1310 static JNINativeMethod MH_methods[] = {
1311 // UnsupportedOperationException throwers
1312 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1313 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1314 };
1315
1316 /**
1317 * Helper method to register native methods.
1318 */
1319 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1320 int status = env->RegisterNatives(clazz, methods, nMethods);
1321 if (status != JNI_OK || env->ExceptionOccurred()) {
1322 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1323 env->ExceptionClear();
1324 return false;
1325 }
1326 return true;
1327 }
1328
1329 /**
1330 * This one function is exported, used by NativeLookup.
1331 */
1332 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1333 if (!EnableInvokeDynamic) {
1334 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
1335 return; // bind nothing
1336 }
1337
1338 assert(!MethodHandles::enabled(), "must not be enabled");
1339 bool enable_MH = true;
1340
1341 jclass MH_class = NULL;
1342 if (SystemDictionary::MethodHandle_klass() == NULL) {
1343 enable_MH = false;
1344 } else {
1345 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1346 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1347 }
1348
1349 if (enable_MH) {
1350 ThreadToNativeFromVM ttnfv(thread);
1351
1352 if (enable_MH) {
1353 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1354 }
1355 if (enable_MH) {
1356 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1357 }
1358 }
1359
1360 if (TraceInvokeDynamic) {
1361 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1362 }
1363
1364 if (enable_MH) {
1365 MethodHandles::generate_adapters();
1366 MethodHandles::set_enabled(true);
1367 }
1368 }
1369 JVM_END