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 // We can ignore passed-in limit because interfaces are interconvertible.
187 // More importantly, the itable index only works with the method holder.
188 receiver_limit = m->method_holder();
189 assert(receiver_limit->verify_itable_index(vmindex), "");
190 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
191 break;
192
193 case CallInfo::vtable_call:
194 vmindex = info.vtable_index();
195 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
196 assert(receiver_limit->is_subtype_of(m->method_holder()), "virtual call must be type-safe");
197 break;
198
199 case CallInfo::direct_call:
200 vmindex = Method::nonvirtual_vtable_index;
201 if (m->is_static()) {
202 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
203 } else if (m->is_initializer()) {
204 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
205 assert(receiver_limit == m->method_holder(), "constructor call must be exactly typed");
206 } else {
207 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
208 assert(receiver_limit->is_subtype_of(m->method_holder()), "special call must be type-safe");
209 }
210 break;
211
212 default: assert(false, "bad CallInfo"); return NULL;
213 }
214
215 // @CallerSensitive annotation detected
216 if (m->caller_sensitive()) {
217 flags |= CALLER_SENSITIVE;
218 }
219
220 oop mname_oop = mname();
221 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
222 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
223 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
224 java_lang_invoke_MemberName::set_clazz( mname_oop, receiver_limit->java_mirror());
225 // Note: name and type can be lazily computed by resolve_MemberName,
226 // if Java code needs them as resolved String and MethodType objects.
227 // The clazz must be eagerly stored, because it provides a GC
228 // root to help keep alive the Method*.
229 // If relevant, the vtable or itable value is stored as vmindex.
230 // This is done eagerly, since it is readily available without
231 // constructing any new objects.
232 // TO DO: maybe intern mname_oop
233 m->method_holder()->add_member_name(m->method_idnum(), mname);
234
235 return mname();
236 }
237
238 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
239 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
240 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
241 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
242 Metadata* vmtarget = fd.field_holder();
243 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
244 oop mname_oop = mname();
245 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
246 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
247 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
248 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
249 oop type = field_signature_type_or_null(fd.signature());
250 oop name = field_name_or_null(fd.name());
251 if (name != NULL)
252 java_lang_invoke_MemberName::set_name(mname_oop, name);
253 if (type != NULL)
254 java_lang_invoke_MemberName::set_type(mname_oop, type);
255 // Note: name and type can be lazily computed by resolve_MemberName,
256 // if Java code needs them as resolved String and Class objects.
257 // Note that the incoming type oop might be pre-resolved (non-null).
258 // The base clazz and field offset (vmindex) must be eagerly stored,
259 // because they unambiguously identify the field.
260 // Although the fieldDescriptor::_index would also identify the field,
261 // we do not use it, because it is harder to decode.
262 // TO DO: maybe intern mname_oop
263 return mname();
264 }
265
266 // JVM 2.9 Special Methods:
267 // A method is signature polymorphic if and only if all of the following conditions hold :
268 // * It is declared in the java.lang.invoke.MethodHandle class.
269 // * It has a single formal parameter of type Object[].
270 // * It has a return type of Object.
271 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
272 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
273 if (klass == NULL)
274 return false;
275 // The following test will fail spuriously during bootstrap of MethodHandle itself:
276 // if (klass != SystemDictionary::MethodHandle_klass())
277 // Test the name instead:
278 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
279 return false;
280 Symbol* poly_sig = vmSymbols::object_array_object_signature();
281 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
282 if (m == NULL) return false;
283 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
284 int flags = m->access_flags().as_int();
285 return (flags & required) == required;
286 }
287
288
289 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
290 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
291 switch (iid) {
292 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
293 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
294 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
295 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
296 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
297 }
298 assert(false, "");
299 return 0;
300 }
301
302 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
303 switch (iid) {
304 case vmIntrinsics::_invokeBasic: return 0;
305 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
306 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
307 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
308 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
309 }
310 assert(false, err_msg("iid=%d", iid));
311 return 0;
312 }
313
314 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
315 vmSymbols::SID name_id = vmSymbols::find_sid(name);
316 switch (name_id) {
317 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
318 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
319 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
320 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
321
322 // There is one static signature-polymorphic method for each JVM invocation mode.
323 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
324 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
325 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
326 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
327 }
328
329 // Cover the case of invokeExact and any future variants of invokeFoo.
330 Klass* mh_klass = SystemDictionary::well_known_klass(
331 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
332 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
333 return vmIntrinsics::_invokeGeneric;
334
335 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
336 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
337 return vmIntrinsics::_none;
338 }
339
340 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
341 if (klass != NULL &&
342 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
343 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
344 if (iid != vmIntrinsics::_none)
345 return iid;
346 if (is_method_handle_invoke_name(klass, name))
347 return vmIntrinsics::_invokeGeneric;
348 }
349 return vmIntrinsics::_none;
350 }
351
352
353 // convert the external string or reflective type to an internal signature
354 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
355 if (java_lang_invoke_MethodType::is_instance(type_str)) {
356 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
357 } else if (java_lang_Class::is_instance(type_str)) {
358 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
359 } else if (java_lang_String::is_instance(type_str)) {
360 if (intern_if_not_found) {
361 return java_lang_String::as_symbol(type_str, CHECK_NULL);
362 } else {
363 return java_lang_String::as_symbol_or_null(type_str);
364 }
365 } else {
366 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
367 }
368 }
369
370 static const char OBJ_SIG[] = "Ljava/lang/Object;";
371 enum { OBJ_SIG_LEN = 18 };
372
373 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
374 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
375 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
376 const int len = sig->utf8_length();
377 for (int i = 0; i < len; i++) {
378 switch (sig->byte_at(i)) {
379 case 'L':
380 // only java/lang/Object is valid here
381 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
382 return false;
383 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
384 continue;
385 case '(': case ')': case 'V':
386 case 'I': case 'J': case 'F': case 'D':
387 continue;
388 //case '[':
389 //case 'Z': case 'B': case 'C': case 'S':
390 default:
391 return false;
392 }
393 }
394 return true;
395 }
396
397 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
398 Symbol* bsig = NULL;
399 if (sig == NULL) {
400 return sig;
401 } else if (is_basic_type_signature(sig)) {
402 sig->increment_refcount();
403 return sig; // that was easy
404 } else if (sig->byte_at(0) != '(') {
405 BasicType bt = char2type(sig->byte_at(0));
406 if (is_subword_type(bt)) {
407 bsig = vmSymbols::int_signature();
408 } else {
409 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
410 bsig = vmSymbols::object_signature();
411 }
412 } else {
413 ResourceMark rm;
414 stringStream buffer(128);
415 buffer.put('(');
416 int arg_pos = 0, keep_arg_pos = -1;
417 if (keep_last_arg)
418 keep_arg_pos = ArgumentCount(sig).size() - 1;
419 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
420 BasicType bt = ss.type();
421 size_t this_arg_pos = buffer.size();
422 if (ss.at_return_type()) {
423 buffer.put(')');
424 }
425 if (arg_pos == keep_arg_pos) {
426 buffer.write((char*) ss.raw_bytes(),
427 (int) ss.raw_length());
428 } else if (bt == T_OBJECT || bt == T_ARRAY) {
429 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
430 } else {
431 if (is_subword_type(bt))
432 bt = T_INT;
433 buffer.put(type2char(bt));
434 }
435 arg_pos++;
436 }
437 const char* sigstr = buffer.base();
438 int siglen = (int) buffer.size();
439 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
440 }
441 assert(is_basic_type_signature(bsig) ||
442 // detune assert in case the injected argument is not a basic type:
443 keep_last_arg, "");
444 return bsig;
445 }
446
447 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
448 Symbol* sig,
449 bool keep_arrays,
450 bool keep_basic_names) {
451 st = st ? st : tty;
452 int len = sig->utf8_length();
453 int array = 0;
454 bool prev_type = false;
455 for (int i = 0; i < len; i++) {
456 char ch = sig->byte_at(i);
457 switch (ch) {
458 case '(': case ')':
459 prev_type = false;
460 st->put(ch);
461 continue;
462 case '[':
463 if (!keep_basic_names && keep_arrays)
464 st->put(ch);
465 array++;
466 continue;
467 case 'L':
468 {
469 if (prev_type) st->put(',');
470 int start = i+1, slash = start;
471 while (++i < len && (ch = sig->byte_at(i)) != ';') {
472 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
473 }
474 if (slash < i) start = slash;
475 if (!keep_basic_names) {
476 st->put('L');
477 } else {
478 for (int j = start; j < i; j++)
479 st->put(sig->byte_at(j));
480 prev_type = true;
481 }
482 break;
483 }
484 default:
485 {
486 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
487 ch = '[';
488 array = 0;
489 }
490 if (prev_type) st->put(',');
491 const char* n = NULL;
492 if (keep_basic_names)
493 n = type2name(char2type(ch));
494 if (n == NULL) {
495 // unknown letter, or we don't want to know its name
496 st->put(ch);
497 } else {
498 st->print(n);
499 prev_type = true;
500 }
501 break;
502 }
503 }
504 // Switch break goes here to take care of array suffix:
505 if (prev_type) {
506 while (array > 0) {
507 st->print("[]");
508 --array;
509 }
510 }
511 array = 0;
512 }
513 }
514
515
516
517 static oop object_java_mirror() {
518 return SystemDictionary::Object_klass()->java_mirror();
519 }
520
521 oop MethodHandles::field_name_or_null(Symbol* s) {
522 if (s == NULL) return NULL;
523 return StringTable::lookup(s);
524 }
525
526 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
527 if (s == NULL) return NULL;
528 BasicType bt = FieldType::basic_type(s);
529 if (is_java_primitive(bt)) {
530 assert(s->utf8_length() == 1, "");
531 return java_lang_Class::primitive_mirror(bt);
532 }
533 // Here are some more short cuts for common types.
534 // They are optional, since reference types can be resolved lazily.
535 if (bt == T_OBJECT) {
536 if (s == vmSymbols::object_signature()) {
537 return object_java_mirror();
538 } else if (s == vmSymbols::class_signature()) {
539 return SystemDictionary::Class_klass()->java_mirror();
540 } else if (s == vmSymbols::string_signature()) {
541 return SystemDictionary::String_klass()->java_mirror();
542 }
543 }
544 return NULL;
545 }
546
547
548 // An unresolved member name is a mere symbolic reference.
549 // Resolving it plants a vmtarget/vmindex in it,
550 // which refers directly to JVM internals.
551 Handle MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
552 Handle empty;
553 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
554
555 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
556 // Already resolved.
557 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
558 assert(vmindex >= Method::nonvirtual_vtable_index, "");
559 return mname;
560 }
561
562 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
563 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
564 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
565 int flags = java_lang_invoke_MemberName::flags(mname());
566 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
567 if (!ref_kind_is_valid(ref_kind)) {
568 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
569 }
570
571 DEBUG_ONLY(int old_vmindex);
572 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
573
574 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
575 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
576 }
577
578 instanceKlassHandle defc;
579 {
580 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
581 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
582 if (!defc_klass->oop_is_instance()) {
583 if (!defc_klass->oop_is_array()) return empty;
584 defc_klass = SystemDictionary::Object_klass();
585 }
586 defc = instanceKlassHandle(THREAD, defc_klass);
587 }
588 if (defc.is_null()) {
589 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
590 }
591 defc->link_class(CHECK_(empty)); // possible safepoint
592
593 // convert the external string name to an internal symbol
594 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
595 if (name == NULL) return empty; // no such name
596 if (name == vmSymbols::class_initializer_name())
597 return empty; // illegal name
598
599 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
600 if ((flags & ALL_KINDS) == IS_METHOD &&
601 (defc() == SystemDictionary::MethodHandle_klass()) &&
602 (ref_kind == JVM_REF_invokeVirtual ||
603 ref_kind == JVM_REF_invokeSpecial ||
604 // static invocation mode is required for _linkToVirtual, etc.:
605 ref_kind == JVM_REF_invokeStatic)) {
606 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
607 if (iid != vmIntrinsics::_none &&
608 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
609 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
610 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
611 mh_invoke_id = iid;
612 }
613 }
614
615 // convert the external string or reflective type to an internal signature
616 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
617 if (type == NULL) return empty; // no such signature exists in the VM
618
619 // Time to do the lookup.
620 switch (flags & ALL_KINDS) {
621 case IS_METHOD:
622 {
623 CallInfo result;
624 {
625 assert(!HAS_PENDING_EXCEPTION, "");
626 if (ref_kind == JVM_REF_invokeStatic) {
627 LinkResolver::resolve_static_call(result,
628 defc, name, type, KlassHandle(), false, false, THREAD);
629 } else if (ref_kind == JVM_REF_invokeInterface) {
630 LinkResolver::resolve_interface_call(result, Handle(), defc,
631 defc, name, type, KlassHandle(), false, false, THREAD);
632 } else if (mh_invoke_id != vmIntrinsics::_none) {
633 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
634 LinkResolver::resolve_handle_call(result,
635 defc, name, type, KlassHandle(), THREAD);
636 } else if (ref_kind == JVM_REF_invokeSpecial) {
637 LinkResolver::resolve_special_call(result,
638 defc, name, type, KlassHandle(), false, THREAD);
639 } else if (ref_kind == JVM_REF_invokeVirtual) {
640 LinkResolver::resolve_virtual_call(result, Handle(), defc,
641 defc, name, type, KlassHandle(), false, false, THREAD);
642 } else {
643 assert(false, err_msg("ref_kind=%d", ref_kind));
644 }
645 if (HAS_PENDING_EXCEPTION) {
646 return empty;
647 }
648 }
649 if (result.resolved_appendix().not_null()) {
650 // The resolved MemberName must not be accompanied by an appendix argument,
651 // since there is no way to bind this value into the MemberName.
652 // Caller is responsible to prevent this from happening.
653 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
654 }
655 oop mname2 = init_method_MemberName(mname, result);
656 return Handle(THREAD, mname2);
657 }
658 case IS_CONSTRUCTOR:
659 {
660 CallInfo result;
661 {
662 assert(!HAS_PENDING_EXCEPTION, "");
663 if (name == vmSymbols::object_initializer_name()) {
664 LinkResolver::resolve_special_call(result,
665 defc, name, type, KlassHandle(), false, THREAD);
666 } else {
667 break; // will throw after end of switch
668 }
669 if (HAS_PENDING_EXCEPTION) {
670 return empty;
671 }
672 }
673 assert(result.is_statically_bound(), "");
674 oop mname2 = init_method_MemberName(mname, result);
675 return Handle(THREAD, mname2);
676 }
677 case IS_FIELD:
678 {
679 fieldDescriptor result; // find_field initializes fd if found
680 {
681 assert(!HAS_PENDING_EXCEPTION, "");
682 LinkResolver::resolve_field(result, defc, name, type, KlassHandle(), Bytecodes::_nop, false, false, THREAD);
683 if (HAS_PENDING_EXCEPTION) {
684 return empty;
685 }
686 }
687 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
688 return Handle(THREAD, mname2);
689 }
690 default:
691 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
692 }
693
694 return empty;
695 }
696
697 // Conversely, a member name which is only initialized from JVM internals
698 // may have null defc, name, and type fields.
699 // Resolving it plants a vmtarget/vmindex in it,
700 // which refers directly to JVM internals.
701 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
702 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
703 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
704 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
705 if (vmtarget == NULL) {
706 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
707 }
708
709 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
710 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
711 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
712 int flags = java_lang_invoke_MemberName::flags(mname());
713
714 if (suppress != 0) {
715 if (suppress & _suppress_defc) have_defc = true;
716 if (suppress & _suppress_name) have_name = true;
717 if (suppress & _suppress_type) have_type = true;
718 }
719
720 if (have_defc && have_name && have_type) return; // nothing needed
721
722 switch (flags & ALL_KINDS) {
723 case IS_METHOD:
724 case IS_CONSTRUCTOR:
725 {
726 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
727 methodHandle m(THREAD, (Method*)vmtarget);
728 DEBUG_ONLY(vmtarget = NULL); // safety
729 if (m.is_null()) break;
730 if (!have_defc) {
731 InstanceKlass* defc = m->method_holder();
732 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
733 }
734 if (!have_name) {
735 //not java_lang_String::create_from_symbol; let's intern member names
736 Handle name = StringTable::intern(m->name(), CHECK);
737 java_lang_invoke_MemberName::set_name(mname(), name());
738 }
739 if (!have_type) {
740 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
741 java_lang_invoke_MemberName::set_type(mname(), type());
742 }
743 return;
744 }
745 case IS_FIELD:
746 {
747 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
748 if (!((Klass*) vmtarget)->oop_is_instance()) break;
749 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
750 DEBUG_ONLY(vmtarget = NULL); // safety
751 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
752 fieldDescriptor fd; // find_field initializes fd if found
753 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
754 break; // cannot expand
755 if (!have_defc) {
756 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
757 }
758 if (!have_name) {
759 //not java_lang_String::create_from_symbol; let's intern member names
760 Handle name = StringTable::intern(fd.name(), CHECK);
761 java_lang_invoke_MemberName::set_name(mname(), name());
762 }
763 if (!have_type) {
764 // If it is a primitive field type, don't mess with short strings like "I".
765 Handle type = field_signature_type_or_null(fd.signature());
766 if (type.is_null()) {
767 java_lang_String::create_from_symbol(fd.signature(), CHECK);
768 }
769 java_lang_invoke_MemberName::set_type(mname(), type());
770 }
771 return;
772 }
773 }
774 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
775 }
776
777 int MethodHandles::find_MemberNames(KlassHandle k,
778 Symbol* name, Symbol* sig,
779 int mflags, KlassHandle caller,
780 int skip, objArrayHandle results) {
781 // %%% take caller into account!
782
783 Thread* thread = Thread::current();
784
785 if (k.is_null() || !k->oop_is_instance()) return -1;
786
787 int rfill = 0, rlimit = results->length(), rskip = skip;
788 // overflow measurement:
789 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
790
791 int match_flags = mflags;
792 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
793 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
794 bool local_only = !(search_superc | search_intfc);
795 bool classes_only = false;
796
797 if (name != NULL) {
798 if (name->utf8_length() == 0) return 0; // a match is not possible
799 }
800 if (sig != NULL) {
801 if (sig->utf8_length() == 0) return 0; // a match is not possible
802 if (sig->byte_at(0) == '(')
803 match_flags &= ~(IS_FIELD | IS_TYPE);
804 else
805 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
806 }
807
808 if ((match_flags & IS_TYPE) != 0) {
809 // NYI, and Core Reflection works quite well for this query
810 }
811
812 if ((match_flags & IS_FIELD) != 0) {
813 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
814 if (name != NULL && st.name() != name)
815 continue;
816 if (sig != NULL && st.signature() != sig)
817 continue;
818 // passed the filters
819 if (rskip > 0) {
820 --rskip;
821 } else if (rfill < rlimit) {
822 Handle result(thread, results->obj_at(rfill++));
823 if (!java_lang_invoke_MemberName::is_instance(result()))
824 return -99; // caller bug!
825 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
826 if (saved != result())
827 results->obj_at_put(rfill-1, saved); // show saved instance to user
828 } else if (++overflow >= overflow_limit) {
829 match_flags = 0; break; // got tired of looking at overflow
830 }
831 }
832 }
833
834 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
835 // watch out for these guys:
836 Symbol* init_name = vmSymbols::object_initializer_name();
837 Symbol* clinit_name = vmSymbols::class_initializer_name();
838 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
839 bool negate_name_test = false;
840 // fix name so that it captures the intention of IS_CONSTRUCTOR
841 if (!(match_flags & IS_METHOD)) {
842 // constructors only
843 if (name == NULL) {
844 name = init_name;
845 } else if (name != init_name) {
846 return 0; // no constructors of this method name
847 }
848 } else if (!(match_flags & IS_CONSTRUCTOR)) {
849 // methods only
850 if (name == NULL) {
851 name = init_name;
852 negate_name_test = true; // if we see the name, we *omit* the entry
853 } else if (name == init_name) {
854 return 0; // no methods of this constructor name
855 }
856 } else {
857 // caller will accept either sort; no need to adjust name
858 }
859 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
860 Method* m = st.method();
861 Symbol* m_name = m->name();
862 if (m_name == clinit_name)
863 continue;
864 if (name != NULL && ((m_name != name) ^ negate_name_test))
865 continue;
866 if (sig != NULL && m->signature() != sig)
867 continue;
868 // passed the filters
869 if (rskip > 0) {
870 --rskip;
871 } else if (rfill < rlimit) {
872 Handle result(thread, results->obj_at(rfill++));
873 if (!java_lang_invoke_MemberName::is_instance(result()))
874 return -99; // caller bug!
875 CallInfo info(m);
876 oop saved = MethodHandles::init_method_MemberName(result, info);
877 if (saved != result())
878 results->obj_at_put(rfill-1, saved); // show saved instance to user
879 } else if (++overflow >= overflow_limit) {
880 match_flags = 0; break; // got tired of looking at overflow
881 }
882 }
883 }
884
885 // return number of elements we at leasted wanted to initialize
886 return rfill + overflow;
887 }
888
889 //------------------------------------------------------------------------------
890 // MemberNameTable
891 //
892
893 MemberNameTable::MemberNameTable(int methods_cnt)
894 : GrowableArray<jweak>(methods_cnt, true) {
895 assert_locked_or_safepoint(MemberNameTable_lock);
896 }
897
898 MemberNameTable::~MemberNameTable() {
899 assert_locked_or_safepoint(MemberNameTable_lock);
900 int len = this->length();
901
902 for (int idx = 0; idx < len; idx++) {
903 jweak ref = this->at(idx);
904 JNIHandles::destroy_weak_global(ref);
905 }
906 }
907
908 void MemberNameTable::add_member_name(int index, jweak mem_name_wref) {
909 assert_locked_or_safepoint(MemberNameTable_lock);
910 this->at_put_grow(index, mem_name_wref);
911 }
912
913 // Return a member name oop or NULL.
914 oop MemberNameTable::get_member_name(int index) {
915 assert_locked_or_safepoint(MemberNameTable_lock);
916
917 jweak ref = this->at(index);
918 oop mem_name = JNIHandles::resolve(ref);
919 return mem_name;
920 }
921
922 #if INCLUDE_JVMTI
923 oop MemberNameTable::find_member_name_by_method(Method* old_method) {
924 assert_locked_or_safepoint(MemberNameTable_lock);
925 oop found = NULL;
926 int len = this->length();
927
928 for (int idx = 0; idx < len; idx++) {
929 oop mem_name = JNIHandles::resolve(this->at(idx));
930 if (mem_name == NULL) {
931 continue;
932 }
933 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
934 if (method == old_method) {
935 found = mem_name;
936 break;
937 }
938 }
939 return found;
940 }
941
942 // It is called at safepoint only
943 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
944 int methods_length, bool *trace_name_printed) {
945 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
946 // search the MemberNameTable for uses of either obsolete or EMCP methods
947 for (int j = 0; j < methods_length; j++) {
948 Method* old_method = old_methods[j];
949 Method* new_method = new_methods[j];
950 oop mem_name = find_member_name_by_method(old_method);
951 if (mem_name != NULL) {
952 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method);
953
954 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
955 if (!(*trace_name_printed)) {
956 // RC_TRACE_MESG macro has an embedded ResourceMark
957 RC_TRACE_MESG(("adjust: name=%s",
958 old_method->method_holder()->external_name()));
959 *trace_name_printed = true;
960 }
961 // RC_TRACE macro has an embedded ResourceMark
962 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
963 new_method->name()->as_C_string(),
964 new_method->signature()->as_C_string()));
965 }
966 }
967 }
968 }
969 #endif // INCLUDE_JVMTI
970
971 //
972 // Here are the native methods in java.lang.invoke.MethodHandleNatives
973 // They are the private interface between this JVM and the HotSpot-specific
974 // Java code that implements JSR 292 method handles.
975 //
976 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
977 // that intrinsic (non-JNI) native methods are defined in HotSpot.
978 //
979
980 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
981 switch (which) {
982 case MethodHandles::GC_COUNT_GWT:
983 #ifdef COMPILER2
984 return true;
985 #else
986 return false;
987 #endif
988 }
989 return 0;
990 }
991 JVM_END
992
993 #ifndef PRODUCT
994 #define EACH_NAMED_CON(template, requirement) \
995 template(MethodHandles,GC_COUNT_GWT) \
996 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
997 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
998 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
999 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1000 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1001 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1002 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1003 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1004 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1005 template(MethodHandles,GC_LAMBDA_SUPPORT) \
1006 /*end*/
1007
1008 #define IGNORE_REQ(req_expr) /* req_expr */
1009 #define ONE_PLUS(scope,value) 1+
1010 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1011 #define VALUE_COMMA(scope,value) scope::value,
1012 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1013 #define STRING_NULL(scope,value) #value "\0"
1014 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1015
1016 static bool advertise_con_value(int which) {
1017 if (which < 0) return false;
1018 bool ok = true;
1019 int count = 0;
1020 #define INC_COUNT(scope,value) \
1021 ++count;
1022 #define CHECK_REQ(req_expr) \
1023 if (which < count) return ok; \
1024 ok = (req_expr);
1025 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1026 #undef INC_COUNT
1027 #undef CHECK_REQ
1028 assert(count == con_value_count, "");
1029 if (which < count) return ok;
1030 return false;
1031 }
1032
1033 #undef ONE_PLUS
1034 #undef VALUE_COMMA
1035 #undef STRING_NULL
1036 #undef EACH_NAMED_CON
1037 #endif // PRODUCT
1038
1039 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1040 #ifndef PRODUCT
1041 if (advertise_con_value(which)) {
1042 assert(which >= 0 && which < con_value_count, "");
1043 int con = con_values[which];
1044 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1045 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1046 const char* str = &con_names[0];
1047 for (int i = 0; i < which; i++)
1048 str += strlen(str) + 1; // skip name and null
1049 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1050 box->obj_at_put(0, name);
1051 }
1052 return con;
1053 }
1054 #endif
1055 return 0;
1056 }
1057 JVM_END
1058
1059 // void init(MemberName self, AccessibleObject ref)
1060 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1061 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1062 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1063 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1064 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1065 MethodHandles::init_MemberName(mname, target);
1066 }
1067 JVM_END
1068
1069 // void expand(MemberName self)
1070 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1071 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1072 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1073 MethodHandles::expand_MemberName(mname, 0, CHECK);
1074 }
1075 JVM_END
1076
1077 // void resolve(MemberName self, Class<?> caller)
1078 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1079 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1080 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1081
1082 // The trusted Java code that calls this method should already have performed
1083 // access checks on behalf of the given caller. But, we can verify this.
1084 if (VerifyMethodHandles && caller_jh != NULL &&
1085 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1086 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1087 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1088 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1089 }
1090
1091 // Reflection::verify_class_access can only handle instance classes.
1092 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1093 // Emulate LinkResolver::check_klass_accessability.
1094 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1095 if (!Reflection::verify_class_access(caller,
1096 reference_klass,
1097 true)) {
1098 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1099 }
1100 }
1101 }
1102
1103 Handle resolved = MethodHandles::resolve_MemberName(mname, CHECK_NULL);
1104 if (resolved.is_null()) {
1105 int flags = java_lang_invoke_MemberName::flags(mname());
1106 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1107 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1108 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1109 }
1110 if ((flags & ALL_KINDS) == IS_FIELD) {
1111 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1112 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1113 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1114 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1115 } else {
1116 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1117 }
1118 }
1119
1120 return JNIHandles::make_local(THREAD, resolved());
1121 }
1122 JVM_END
1123
1124 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1125 if (mname == NULL ||
1126 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1127 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1128 } else {
1129 int flags = java_lang_invoke_MemberName::flags(mname);
1130 if ((flags & IS_FIELD) != 0 &&
1131 (must_be_static
1132 ? (flags & JVM_ACC_STATIC) != 0
1133 : (flags & JVM_ACC_STATIC) == 0)) {
1134 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1135 return (jlong) vmindex;
1136 }
1137 }
1138 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1139 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1140 return 0;
1141 }
1142
1143 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1144 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1145 }
1146 JVM_END
1147
1148 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1149 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1150 }
1151 JVM_END
1152
1153 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1154 // use the other function to perform sanity checks:
1155 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1156 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1157 return JNIHandles::make_local(THREAD, clazz);
1158 }
1159 JVM_END
1160
1161 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1162 if (mname_jh == NULL) return NULL;
1163 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1164 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1165 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1166 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1167 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1168 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1169 result->obj_at_put(0, x);
1170 x = NULL;
1171 if (vmtarget == NULL) {
1172 x = NULL;
1173 } else if (vmtarget->is_klass()) {
1174 x = ((Klass*) vmtarget)->java_mirror();
1175 } else if (vmtarget->is_method()) {
1176 Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL);
1177 CallInfo info((Method*)vmtarget);
1178 x = MethodHandles::init_method_MemberName(mname2, info);
1179 }
1180 result->obj_at_put(1, x);
1181 return JNIHandles::make_local(env, result());
1182 }
1183 JVM_END
1184
1185
1186
1187 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1188 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1189 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1190 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1191 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1192 if (clazz_jh == NULL || results_jh == NULL) return -1;
1193 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1194
1195 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1196 if (results.is_null() || !results->is_objArray()) return -1;
1197
1198 TempNewSymbol name = NULL;
1199 TempNewSymbol sig = NULL;
1200 if (name_jh != NULL) {
1201 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1202 if (name == NULL) return 0; // a match is not possible
1203 }
1204 if (sig_jh != NULL) {
1205 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1206 if (sig == NULL) return 0; // a match is not possible
1207 }
1208
1209 KlassHandle caller;
1210 if (caller_jh != NULL) {
1211 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1212 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1213 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1214 }
1215
1216 if (name != NULL && sig != NULL && results.not_null()) {
1217 // try a direct resolve
1218 // %%% TO DO
1219 }
1220
1221 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1222 caller, skip, results);
1223 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1224 return res;
1225 }
1226 JVM_END
1227
1228 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1229 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1230 Handle target (THREAD, JNIHandles::resolve(target_jh));
1231 {
1232 // Walk all nmethods depending on this call site.
1233 MutexLocker mu(Compile_lock, thread);
1234 Universe::flush_dependents_on(call_site, target);
1235 java_lang_invoke_CallSite::set_target(call_site(), target());
1236 }
1237 }
1238 JVM_END
1239
1240 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1241 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1242 Handle target (THREAD, JNIHandles::resolve(target_jh));
1243 {
1244 // Walk all nmethods depending on this call site.
1245 MutexLocker mu(Compile_lock, thread);
1246 Universe::flush_dependents_on(call_site, target);
1247 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1248 }
1249 }
1250 JVM_END
1251
1252 /**
1253 * Throws a java/lang/UnsupportedOperationException unconditionally.
1254 * This is required by the specification of MethodHandle.invoke if
1255 * invoked directly.
1256 */
1257 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1258 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1259 return NULL;
1260 }
1261 JVM_END
1262
1263 /**
1264 * Throws a java/lang/UnsupportedOperationException unconditionally.
1265 * This is required by the specification of MethodHandle.invokeExact if
1266 * invoked directly.
1267 */
1268 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1269 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1270 return NULL;
1271 }
1272 JVM_END
1273
1274 /// JVM_RegisterMethodHandleMethods
1275
1276 #undef CS // Solaris builds complain
1277
1278 #define LANG "Ljava/lang/"
1279 #define JLINV "Ljava/lang/invoke/"
1280
1281 #define OBJ LANG"Object;"
1282 #define CLS LANG"Class;"
1283 #define STRG LANG"String;"
1284 #define CS JLINV"CallSite;"
1285 #define MT JLINV"MethodType;"
1286 #define MH JLINV"MethodHandle;"
1287 #define MEM JLINV"MemberName;"
1288
1289 #define CC (char*) /*cast a literal from (const char*)*/
1290 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1291
1292 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1293 static JNINativeMethod MHN_methods[] = {
1294 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1295 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1296 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1297 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1298 // static native int getNamedCon(int which, Object[] name)
1299 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1300 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1301 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1302 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1303 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1304 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1305 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1306 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1307 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1308 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1309 };
1310
1311 static JNINativeMethod MH_methods[] = {
1312 // UnsupportedOperationException throwers
1313 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1314 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1315 };
1316
1317 /**
1318 * Helper method to register native methods.
1319 */
1320 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1321 int status = env->RegisterNatives(clazz, methods, nMethods);
1322 if (status != JNI_OK || env->ExceptionOccurred()) {
1323 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1324 env->ExceptionClear();
1325 return false;
1326 }
1327 return true;
1328 }
1329
1330 /**
1331 * This one function is exported, used by NativeLookup.
1332 */
1333 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1334 if (!EnableInvokeDynamic) {
1335 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
1336 return; // bind nothing
1337 }
1338
1339 assert(!MethodHandles::enabled(), "must not be enabled");
1340 bool enable_MH = true;
1341
1342 jclass MH_class = NULL;
1343 if (SystemDictionary::MethodHandle_klass() == NULL) {
1344 enable_MH = false;
1345 } else {
1346 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1347 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1348 }
1349
1350 if (enable_MH) {
1351 ThreadToNativeFromVM ttnfv(thread);
1352
1353 if (enable_MH) {
1354 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1355 }
1356 if (enable_MH) {
1357 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1358 }
1359 }
1360
1361 if (TraceInvokeDynamic) {
1362 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1363 }
1364
1365 if (enable_MH) {
1366 MethodHandles::generate_adapters();
1367 MethodHandles::set_enabled(true);
1368 }
1369 }
1370 JVM_END