1 /*
2 * Copyright (c) 2008, 2012, 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/methodHandles.hpp"
33 #include "runtime/compilationPolicy.hpp"
34 #include "runtime/javaCalls.hpp"
35 #include "runtime/reflection.hpp"
36 #include "runtime/signature.hpp"
37 #include "runtime/stubRoutines.hpp"
38
39
40 /*
41 * JSR 292 reference implementation: method handles
42 * The JDK 7 reference implementation represented method handle
43 * combinations as chains. Each link in the chain had a "vmentry"
44 * field which pointed at a bit of assembly code which performed
45 * one transformation before dispatching to the next link in the chain.
46 *
47 * The current reference implementation pushes almost all code generation
48 * responsibility to (trusted) Java code. A method handle contains a
49 * pointer to its "LambdaForm", which embodies all details of the method
50 * handle's behavior. The LambdaForm is a normal Java object, managed
51 * by a runtime coded in Java.
52 */
53
54 bool MethodHandles::_enabled = false; // set true after successful native linkage
55 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
56
57 //------------------------------------------------------------------------------
58 // MethodHandles::generate_adapters
59 //
60 void MethodHandles::generate_adapters() {
61 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
62
63 assert(_adapter_code == NULL, "generate only once");
64
65 ResourceMark rm;
66 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
67 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
68 if (_adapter_code == NULL)
69 vm_exit_out_of_memory(adapter_code_size, "CodeCache: no room for MethodHandles adapters");
70 {
71 CodeBuffer code(_adapter_code);
72 MethodHandlesAdapterGenerator g(&code);
73 g.generate();
74 code.log_section_sizes("MethodHandlesAdapterBlob");
75 }
76 }
77
78 //------------------------------------------------------------------------------
79 // MethodHandlesAdapterGenerator::generate
80 //
81 void MethodHandlesAdapterGenerator::generate() {
82 // Generate generic method handle adapters.
83 // Generate interpreter entries
84 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
85 mk <= Interpreter::method_handle_invoke_LAST;
86 mk = Interpreter::MethodKind(1 + (int)mk)) {
87 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
88 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
89 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
90 if (entry != NULL) {
91 Interpreter::set_entry_for_kind(mk, entry);
92 }
93 // If the entry is not set, it will throw AbstractMethodError.
94 }
95 }
96
97 void MethodHandles::set_enabled(bool z) {
98 if (_enabled != z) {
99 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
100 _enabled = z;
101 }
102 }
103
104 // MemberName support
105
106 // import java_lang_invoke_MemberName.*
107 enum {
108 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
109 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
110 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
111 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
112 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
113 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
114 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
115 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
116 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
117 };
118
119 Handle MethodHandles::new_MemberName(TRAPS) {
120 Handle empty;
121 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
122 if (!k->is_initialized()) k->initialize(CHECK_(empty));
123 return Handle(THREAD, k->allocate_instance(THREAD));
124 }
125
126 oop MethodHandles::init_MemberName(oop mname_oop, oop target_oop) {
127 Klass* target_klass = target_oop->klass();
128 if (target_klass == SystemDictionary::reflect_Field_klass()) {
129 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
130 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
131 int mods = java_lang_reflect_Field::modifiers(target_oop);
132 oop type = java_lang_reflect_Field::type(target_oop);
133 oop name = java_lang_reflect_Field::name(target_oop);
134 Klass* k = java_lang_Class::as_Klass(clazz);
135 intptr_t offset = InstanceKlass::cast(k)->field_offset(slot);
136 return init_field_MemberName(mname_oop, k, accessFlags_from(mods), type, name, offset);
137 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
138 oop clazz = java_lang_reflect_Method::clazz(target_oop);
139 int slot = java_lang_reflect_Method::slot(target_oop);
140 Klass* k = java_lang_Class::as_Klass(clazz);
141 if (k != NULL && Klass::cast(k)->oop_is_instance()) {
142 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
143 return init_method_MemberName(mname_oop, m, true, k);
144 }
145 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
146 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
147 int slot = java_lang_reflect_Constructor::slot(target_oop);
148 Klass* k = java_lang_Class::as_Klass(clazz);
149 if (k != NULL && Klass::cast(k)->oop_is_instance()) {
150 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
151 return init_method_MemberName(mname_oop, m, false, k);
152 }
153 } else if (target_klass == SystemDictionary::MemberName_klass()) {
154 // Note: This only works if the MemberName has already been resolved.
155 oop clazz = java_lang_invoke_MemberName::clazz(target_oop);
156 int flags = java_lang_invoke_MemberName::flags(target_oop);
157 Metadata* vmtarget=java_lang_invoke_MemberName::vmtarget(target_oop);
158 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(target_oop);
159 Klass* k = java_lang_Class::as_Klass(clazz);
160 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
161 if (vmtarget == NULL) return NULL; // not resolved
162 if ((flags & IS_FIELD) != 0) {
163 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
164 int basic_mods = (ref_kind_is_static(ref_kind) ? JVM_ACC_STATIC : 0);
165 // FIXME: how does k (receiver_limit) contribute?
166 return init_field_MemberName(mname_oop, (Klass*)vmtarget, accessFlags_from(basic_mods), NULL, NULL, vmindex);
167 } else if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
168 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
169 return init_method_MemberName(mname_oop, (Method*)vmtarget, ref_kind_does_dispatch(ref_kind), k);
170 } else {
171 return NULL;
172 }
173 }
174 return NULL;
175 }
176
177 oop MethodHandles::init_method_MemberName(oop mname_oop, Method* m, bool do_dispatch,
178 Klass* receiver_limit) {
179 AccessFlags mods = m->access_flags();
180 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
181 int vmindex = Method::nonvirtual_vtable_index; // implies never any dispatch
182 Klass* mklass = m->method_holder();
183 if (receiver_limit == NULL)
184 receiver_limit = mklass;
185 if (m->is_initializer()) {
186 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
187 } else if (mods.is_static()) {
188 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
189 } else if (receiver_limit != mklass &&
190 !Klass::cast(receiver_limit)->is_subtype_of(mklass)) {
191 return NULL; // bad receiver limit
192 } else if (Klass::cast(receiver_limit)->is_interface() &&
193 Klass::cast(mklass)->is_interface()) {
194 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
195 receiver_limit = mklass; // ignore passed-in limit; interfaces are interconvertible
196 vmindex = klassItable::compute_itable_index(m);
197 } else if (mklass != receiver_limit && Klass::cast(mklass)->is_interface()) {
198 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
199 // it is a miranda method, so m->vtable_index is not what we want
200 ResourceMark rm;
201 klassVtable* vt = InstanceKlass::cast(receiver_limit)->vtable();
202 vmindex = vt->index_of_miranda(m->name(), m->signature());
203 } else if (!do_dispatch || m->can_be_statically_bound()) {
204 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
205 } else {
206 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
207 vmindex = m->vtable_index();
208 }
209
210 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
211 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m);
212 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
213 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(receiver_limit)->java_mirror());
214 // Note: name and type can be lazily computed by resolve_MemberName,
215 // if Java code needs them as resolved String and MethodType objects.
216 // The clazz must be eagerly stored, because it provides a GC
217 // root to help keep alive the Method*.
218 // If relevant, the vtable or itable value is stored as vmindex.
219 // This is done eagerly, since it is readily available without
220 // constructing any new objects.
221 // TO DO: maybe intern mname_oop
222 return mname_oop;
223 }
224
225 Handle MethodHandles::init_method_MemberName(oop mname_oop, CallInfo& info, TRAPS) {
226 Handle empty;
227 if (info.resolved_appendix().not_null()) {
228 // The resolved MemberName must not be accompanied by an appendix argument,
229 // since there is no way to bind this value into the MemberName.
230 // Caller is responsible to prevent this from happening.
231 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
232 }
233 methodHandle m = info.resolved_method();
234 KlassHandle defc = info.resolved_klass();
235 int vmindex = -1;
236 if (defc->is_interface() && Klass::cast(m->method_holder())->is_interface()) {
237 // LinkResolver does not report itable indexes! (fix this?)
238 vmindex = klassItable::compute_itable_index(m());
239 } else if (m->can_be_statically_bound()) {
240 // LinkResolver reports vtable index even for final methods!
241 vmindex = Method::nonvirtual_vtable_index;
242 } else {
243 vmindex = info.vtable_index();
244 }
245 oop res = init_method_MemberName(mname_oop, m(), (vmindex >= 0), defc());
246 assert(res == NULL || (java_lang_invoke_MemberName::vmindex(res) == vmindex), "");
247 return Handle(THREAD, res);
248 }
249
250 oop MethodHandles::init_field_MemberName(oop mname_oop, Klass* field_holder,
251 AccessFlags mods, oop type, oop name,
252 intptr_t offset, bool is_setter) {
253 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
254 flags |= IS_FIELD | ((mods.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
255 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
256 Metadata* vmtarget = field_holder;
257 int vmindex = offset; // determines the field uniquely when combined with static bit
258 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
259 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
260 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
261 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror());
262 if (name != NULL)
263 java_lang_invoke_MemberName::set_name(mname_oop, name);
264 if (type != NULL)
265 java_lang_invoke_MemberName::set_type(mname_oop, type);
266 // Note: name and type can be lazily computed by resolve_MemberName,
267 // if Java code needs them as resolved String and Class objects.
268 // Note that the incoming type oop might be pre-resolved (non-null).
269 // The base clazz and field offset (vmindex) must be eagerly stored,
270 // because they unambiguously identify the field.
271 // Although the fieldDescriptor::_index would also identify the field,
272 // we do not use it, because it is harder to decode.
273 // TO DO: maybe intern mname_oop
274 return mname_oop;
275 }
276
277 Handle MethodHandles::init_field_MemberName(oop mname_oop, FieldAccessInfo& info, TRAPS) {
278 return Handle();
279 #if 0 // FIXME
280 KlassHandle field_holder = info.klass();
281 intptr_t field_offset = info.field_offset();
282 return init_field_MemberName(mname_oop, field_holder(),
283 info.access_flags(),
284 type, name,
285 field_offset, false /*is_setter*/);
286 #endif
287 }
288
289
290 // JVM 2.9 Special Methods:
291 // A method is signature polymorphic if and only if all of the following conditions hold :
292 // * It is declared in the java.lang.invoke.MethodHandle class.
293 // * It has a single formal parameter of type Object[].
294 // * It has a return type of Object.
295 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
296 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
297 if (klass == NULL)
298 return false;
299 // The following test will fail spuriously during bootstrap of MethodHandle itself:
300 // if (klass != SystemDictionary::MethodHandle_klass())
301 // Test the name instead:
302 if (Klass::cast(klass)->name() != vmSymbols::java_lang_invoke_MethodHandle())
303 return false;
304 Symbol* poly_sig = vmSymbols::object_array_object_signature();
305 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
306 if (m == NULL) return false;
307 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
308 int flags = m->access_flags().as_int();
309 return (flags & required) == required;
310 }
311
312
313 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
314 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
315 switch (iid) {
316 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
317 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
318 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
319 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
320 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
321 }
322 assert(false, "");
323 return 0;
324 }
325
326 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
327 switch (iid) {
328 case vmIntrinsics::_invokeBasic: return 0;
329 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
330 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
331 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
332 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
333 }
334 assert(false, err_msg("iid=%d", iid));
335 return 0;
336 }
337
338 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
339 vmSymbols::SID name_id = vmSymbols::find_sid(name);
340 switch (name_id) {
341 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
342 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
343 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
344 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
345
346 // There is one static signature-polymorphic method for each JVM invocation mode.
347 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
348 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
349 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
350 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
351 }
352
353 // Cover the case of invokeExact and any future variants of invokeFoo.
354 Klass* mh_klass = SystemDictionary::well_known_klass(
355 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
356 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
357 return vmIntrinsics::_invokeGeneric;
358
359 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
360 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
361 return vmIntrinsics::_none;
362 }
363
364 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
365 if (klass != NULL &&
366 Klass::cast(klass)->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
367 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
368 if (iid != vmIntrinsics::_none)
369 return iid;
370 if (is_method_handle_invoke_name(klass, name))
371 return vmIntrinsics::_invokeGeneric;
372 }
373 return vmIntrinsics::_none;
374 }
375
376
377 // convert the external string or reflective type to an internal signature
378 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
379 if (java_lang_invoke_MethodType::is_instance(type_str)) {
380 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
381 } else if (java_lang_Class::is_instance(type_str)) {
382 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
383 } else if (java_lang_String::is_instance(type_str)) {
384 if (intern_if_not_found) {
385 return java_lang_String::as_symbol(type_str, CHECK_NULL);
386 } else {
387 return java_lang_String::as_symbol_or_null(type_str);
388 }
389 } else {
390 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
391 }
392 }
393
394 static const char OBJ_SIG[] = "Ljava/lang/Object;";
395 enum { OBJ_SIG_LEN = 18 };
396
397 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
398 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
399 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
400 const int len = sig->utf8_length();
401 for (int i = 0; i < len; i++) {
402 switch (sig->byte_at(i)) {
403 case 'L':
404 // only java/lang/Object is valid here
405 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
406 return false;
407 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
408 continue;
409 case '(': case ')': case 'V':
410 case 'I': case 'J': case 'F': case 'D':
411 continue;
412 //case '[':
413 //case 'Z': case 'B': case 'C': case 'S':
414 default:
415 return false;
416 }
417 }
418 return true;
419 }
420
421 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
422 Symbol* bsig = NULL;
423 if (sig == NULL) {
424 return sig;
425 } else if (is_basic_type_signature(sig)) {
426 sig->increment_refcount();
427 return sig; // that was easy
428 } else if (sig->byte_at(0) != '(') {
429 BasicType bt = char2type(sig->byte_at(0));
430 if (is_subword_type(bt)) {
431 bsig = vmSymbols::int_signature();
432 } else {
433 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
434 bsig = vmSymbols::object_signature();
435 }
436 } else {
437 ResourceMark rm;
438 stringStream buffer(128);
439 buffer.put('(');
440 int arg_pos = 0, keep_arg_pos = -1;
441 if (keep_last_arg)
442 keep_arg_pos = ArgumentCount(sig).size() - 1;
443 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
444 BasicType bt = ss.type();
445 size_t this_arg_pos = buffer.size();
446 if (ss.at_return_type()) {
447 buffer.put(')');
448 }
449 if (arg_pos == keep_arg_pos) {
450 buffer.write((char*) ss.raw_bytes(),
451 (int) ss.raw_length());
452 } else if (bt == T_OBJECT || bt == T_ARRAY) {
453 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
454 } else {
455 if (is_subword_type(bt))
456 bt = T_INT;
457 buffer.put(type2char(bt));
458 }
459 arg_pos++;
460 }
461 const char* sigstr = buffer.base();
462 int siglen = (int) buffer.size();
463 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
464 }
465 assert(is_basic_type_signature(bsig) ||
466 // detune assert in case the injected argument is not a basic type:
467 keep_last_arg, "");
468 return bsig;
469 }
470
471 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
472 Symbol* sig,
473 bool keep_arrays,
474 bool keep_basic_names) {
475 st = st ? st : tty;
476 int len = sig->utf8_length();
477 int array = 0;
478 bool prev_type = false;
479 for (int i = 0; i < len; i++) {
480 char ch = sig->byte_at(i);
481 switch (ch) {
482 case '(': case ')':
483 prev_type = false;
484 st->put(ch);
485 continue;
486 case '[':
487 if (!keep_basic_names && keep_arrays)
488 st->put(ch);
489 array++;
490 continue;
491 case 'L':
492 {
493 if (prev_type) st->put(',');
494 int start = i+1, slash = start;
495 while (++i < len && (ch = sig->byte_at(i)) != ';') {
496 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
497 }
498 if (slash < i) start = slash;
499 if (!keep_basic_names) {
500 st->put('L');
501 } else {
502 for (int j = start; j < i; j++)
503 st->put(sig->byte_at(j));
504 prev_type = true;
505 }
506 break;
507 }
508 default:
509 {
510 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
511 ch = '[';
512 array = 0;
513 }
514 if (prev_type) st->put(',');
515 const char* n = NULL;
516 if (keep_basic_names)
517 n = type2name(char2type(ch));
518 if (n == NULL) {
519 // unknown letter, or we don't want to know its name
520 st->put(ch);
521 } else {
522 st->print(n);
523 prev_type = true;
524 }
525 break;
526 }
527 }
528 // Switch break goes here to take care of array suffix:
529 if (prev_type) {
530 while (array > 0) {
531 st->print("[]");
532 --array;
533 }
534 }
535 array = 0;
536 }
537 }
538
539
540
541 static oop object_java_mirror() {
542 return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
543 }
544
545 static oop field_name_or_null(Symbol* s) {
546 if (s == NULL) return NULL;
547 return StringTable::lookup(s);
548 }
549
550 static oop field_signature_type_or_null(Symbol* s) {
551 if (s == NULL) return NULL;
552 BasicType bt = FieldType::basic_type(s);
553 if (is_java_primitive(bt)) {
554 assert(s->utf8_length() == 1, "");
555 return java_lang_Class::primitive_mirror(bt);
556 }
557 // Here are some more short cuts for common types.
558 // They are optional, since reference types can be resolved lazily.
559 if (bt == T_OBJECT) {
560 if (s == vmSymbols::object_signature()) {
561 return object_java_mirror();
562 } else if (s == vmSymbols::class_signature()) {
563 return Klass::cast(SystemDictionary::Class_klass())->java_mirror();
564 } else if (s == vmSymbols::string_signature()) {
565 return Klass::cast(SystemDictionary::String_klass())->java_mirror();
566 }
567 }
568 return NULL;
569 }
570
571
572 // An unresolved member name is a mere symbolic reference.
573 // Resolving it plants a vmtarget/vmindex in it,
574 // which refers directly to JVM internals.
575 Handle MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
576 Handle empty;
577 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
578
579 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
580 // Already resolved.
581 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
582 assert(vmindex >= Method::nonvirtual_vtable_index, "");
583 return mname;
584 }
585
586 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
587 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
588 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
589 int flags = java_lang_invoke_MemberName::flags(mname());
590 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
591 if (!ref_kind_is_valid(ref_kind)) {
592 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
593 }
594
595 DEBUG_ONLY(int old_vmindex);
596 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
597
598 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
599 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
600 }
601
602 instanceKlassHandle defc;
603 {
604 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
605 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
606 if (!Klass::cast(defc_klass)->oop_is_instance()) {
607 if (!Klass::cast(defc_klass)->oop_is_array()) return empty;
608 defc_klass = SystemDictionary::Object_klass();
609 }
610 defc = instanceKlassHandle(THREAD, defc_klass);
611 }
612 if (defc.is_null()) {
613 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
614 }
615 defc->link_class(CHECK_(empty)); // possible safepoint
616
617 // convert the external string name to an internal symbol
618 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
619 if (name == NULL) return empty; // no such name
620 if (name == vmSymbols::class_initializer_name())
621 return empty; // illegal name
622
623 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
624 if ((flags & ALL_KINDS) == IS_METHOD &&
625 (defc() == SystemDictionary::MethodHandle_klass()) &&
626 (ref_kind == JVM_REF_invokeVirtual ||
627 ref_kind == JVM_REF_invokeSpecial ||
628 // static invocation mode is required for _linkToVirtual, etc.:
629 ref_kind == JVM_REF_invokeStatic)) {
630 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
631 if (iid != vmIntrinsics::_none &&
632 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
633 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
634 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
635 mh_invoke_id = iid;
636 }
637 }
638
639 // convert the external string or reflective type to an internal signature
640 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
641 if (type == NULL) return empty; // no such signature exists in the VM
642
643 // Time to do the lookup.
644 switch (flags & ALL_KINDS) {
645 case IS_METHOD:
646 {
647 CallInfo result;
648 bool do_dispatch = true; // default, neutral setting
649 {
650 assert(!HAS_PENDING_EXCEPTION, "");
651 if (ref_kind == JVM_REF_invokeStatic) {
652 //do_dispatch = false; // no need, since statics are never dispatched
653 LinkResolver::resolve_static_call(result,
654 defc, name, type, KlassHandle(), false, false, THREAD);
655 } else if (ref_kind == JVM_REF_invokeInterface) {
656 LinkResolver::resolve_interface_call(result, Handle(), defc,
657 defc, name, type, KlassHandle(), false, false, THREAD);
658 } else if (mh_invoke_id != vmIntrinsics::_none) {
659 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
660 LinkResolver::resolve_handle_call(result,
661 defc, name, type, KlassHandle(), THREAD);
662 } else if (ref_kind == JVM_REF_invokeSpecial) {
663 do_dispatch = false; // force non-virtual linkage
664 LinkResolver::resolve_special_call(result,
665 defc, name, type, KlassHandle(), false, THREAD);
666 } else if (ref_kind == JVM_REF_invokeVirtual) {
667 LinkResolver::resolve_virtual_call(result, Handle(), defc,
668 defc, name, type, KlassHandle(), false, false, THREAD);
669 } else {
670 assert(false, err_msg("ref_kind=%d", ref_kind));
671 }
672 if (HAS_PENDING_EXCEPTION) {
673 return empty;
674 }
675 }
676 return init_method_MemberName(mname(), result, THREAD);
677 }
678 case IS_CONSTRUCTOR:
679 {
680 CallInfo result;
681 {
682 assert(!HAS_PENDING_EXCEPTION, "");
683 if (name == vmSymbols::object_initializer_name()) {
684 LinkResolver::resolve_special_call(result,
685 defc, name, type, KlassHandle(), false, THREAD);
686 } else {
687 break; // will throw after end of switch
688 }
689 if (HAS_PENDING_EXCEPTION) {
690 return empty;
691 }
692 }
693 assert(result.is_statically_bound(), "");
694 return init_method_MemberName(mname(), result, THREAD);
695 }
696 case IS_FIELD:
697 {
698 // This is taken from LinkResolver::resolve_field, sans access checks.
699 fieldDescriptor fd; // find_field initializes fd if found
700 KlassHandle sel_klass(THREAD, InstanceKlass::cast(defc())->find_field(name, type, &fd));
701 // check if field exists; i.e., if a klass containing the field def has been selected
702 if (sel_klass.is_null()) return empty; // should not happen
703 oop type = field_signature_type_or_null(fd.signature());
704 oop name = field_name_or_null(fd.name());
705 bool is_setter = (ref_kind_is_valid(ref_kind) && ref_kind_is_setter(ref_kind));
706 mname = Handle(THREAD,
707 init_field_MemberName(mname(), sel_klass(),
708 fd.access_flags(), type, name, fd.offset(), is_setter));
709 return mname;
710 }
711 default:
712 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
713 }
714
715 return empty;
716 }
717
718 // Conversely, a member name which is only initialized from JVM internals
719 // may have null defc, name, and type fields.
720 // Resolving it plants a vmtarget/vmindex in it,
721 // which refers directly to JVM internals.
722 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
723 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
724 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
725 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
726 if (vmtarget == NULL) {
727 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
728 }
729
730 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
731 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
732 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
733 int flags = java_lang_invoke_MemberName::flags(mname());
734
735 if (suppress != 0) {
736 if (suppress & _suppress_defc) have_defc = true;
737 if (suppress & _suppress_name) have_name = true;
738 if (suppress & _suppress_type) have_type = true;
739 }
740
741 if (have_defc && have_name && have_type) return; // nothing needed
742
743 switch (flags & ALL_KINDS) {
744 case IS_METHOD:
745 case IS_CONSTRUCTOR:
746 {
747 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
748 methodHandle m(THREAD, (Method*)vmtarget);
749 DEBUG_ONLY(vmtarget = NULL); // safety
750 if (m.is_null()) break;
751 if (!have_defc) {
752 Klass* defc = m->method_holder();
753 java_lang_invoke_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror());
754 }
755 if (!have_name) {
756 //not java_lang_String::create_from_symbol; let's intern member names
757 Handle name = StringTable::intern(m->name(), CHECK);
758 java_lang_invoke_MemberName::set_name(mname(), name());
759 }
760 if (!have_type) {
761 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
762 java_lang_invoke_MemberName::set_type(mname(), type());
763 }
764 return;
765 }
766 case IS_FIELD:
767 {
768 // This is taken from LinkResolver::resolve_field, sans access checks.
769 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
770 if (!Klass::cast((Klass*) vmtarget)->oop_is_instance()) break;
771 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
772 DEBUG_ONLY(vmtarget = NULL); // safety
773 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
774 fieldDescriptor fd; // find_field initializes fd if found
775 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
776 break; // cannot expand
777 if (!have_defc) {
778 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
779 }
780 if (!have_name) {
781 //not java_lang_String::create_from_symbol; let's intern member names
782 Handle name = StringTable::intern(fd.name(), CHECK);
783 java_lang_invoke_MemberName::set_name(mname(), name());
784 }
785 if (!have_type) {
786 // If it is a primitive field type, don't mess with short strings like "I".
787 Handle type = field_signature_type_or_null(fd.signature());
788 if (type.is_null()) {
789 java_lang_String::create_from_symbol(fd.signature(), CHECK);
790 }
791 java_lang_invoke_MemberName::set_type(mname(), type());
792 }
793 return;
794 }
795 }
796 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
797 }
798
799 int MethodHandles::find_MemberNames(Klass* k,
800 Symbol* name, Symbol* sig,
801 int mflags, Klass* caller,
802 int skip, objArrayOop results) {
803 DEBUG_ONLY(No_Safepoint_Verifier nsv);
804 // this code contains no safepoints!
805
806 // %%% take caller into account!
807
808 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1;
809
810 int rfill = 0, rlimit = results->length(), rskip = skip;
811 // overflow measurement:
812 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
813
814 int match_flags = mflags;
815 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
816 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
817 bool local_only = !(search_superc | search_intfc);
818 bool classes_only = false;
819
820 if (name != NULL) {
821 if (name->utf8_length() == 0) return 0; // a match is not possible
822 }
823 if (sig != NULL) {
824 if (sig->utf8_length() == 0) return 0; // a match is not possible
825 if (sig->byte_at(0) == '(')
826 match_flags &= ~(IS_FIELD | IS_TYPE);
827 else
828 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
829 }
830
831 if ((match_flags & IS_TYPE) != 0) {
832 // NYI, and Core Reflection works quite well for this query
833 }
834
835 if ((match_flags & IS_FIELD) != 0) {
836 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
837 if (name != NULL && st.name() != name)
838 continue;
839 if (sig != NULL && st.signature() != sig)
840 continue;
841 // passed the filters
842 if (rskip > 0) {
843 --rskip;
844 } else if (rfill < rlimit) {
845 oop result = results->obj_at(rfill++);
846 if (!java_lang_invoke_MemberName::is_instance(result))
847 return -99; // caller bug!
848 oop type = field_signature_type_or_null(st.signature());
849 oop name = field_name_or_null(st.name());
850 oop saved = MethodHandles::init_field_MemberName(result, st.klass()(),
851 st.access_flags(), type, name,
852 st.offset());
853 if (saved != result)
854 results->obj_at_put(rfill-1, saved); // show saved instance to user
855 } else if (++overflow >= overflow_limit) {
856 match_flags = 0; break; // got tired of looking at overflow
857 }
858 }
859 }
860
861 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
862 // watch out for these guys:
863 Symbol* init_name = vmSymbols::object_initializer_name();
864 Symbol* clinit_name = vmSymbols::class_initializer_name();
865 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
866 bool negate_name_test = false;
867 // fix name so that it captures the intention of IS_CONSTRUCTOR
868 if (!(match_flags & IS_METHOD)) {
869 // constructors only
870 if (name == NULL) {
871 name = init_name;
872 } else if (name != init_name) {
873 return 0; // no constructors of this method name
874 }
875 } else if (!(match_flags & IS_CONSTRUCTOR)) {
876 // methods only
877 if (name == NULL) {
878 name = init_name;
879 negate_name_test = true; // if we see the name, we *omit* the entry
880 } else if (name == init_name) {
881 return 0; // no methods of this constructor name
882 }
883 } else {
884 // caller will accept either sort; no need to adjust name
885 }
886 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
887 Method* m = st.method();
888 Symbol* m_name = m->name();
889 if (m_name == clinit_name)
890 continue;
891 if (name != NULL && ((m_name != name) ^ negate_name_test))
892 continue;
893 if (sig != NULL && m->signature() != sig)
894 continue;
895 // passed the filters
896 if (rskip > 0) {
897 --rskip;
898 } else if (rfill < rlimit) {
899 oop result = results->obj_at(rfill++);
900 if (!java_lang_invoke_MemberName::is_instance(result))
901 return -99; // caller bug!
902 oop saved = MethodHandles::init_method_MemberName(result, m, true, NULL);
903 if (saved != result)
904 results->obj_at_put(rfill-1, saved); // show saved instance to user
905 } else if (++overflow >= overflow_limit) {
906 match_flags = 0; break; // got tired of looking at overflow
907 }
908 }
909 }
910
911 // return number of elements we at leasted wanted to initialize
912 return rfill + overflow;
913 }
914 //
915 // Here are the native methods in java.lang.invoke.MethodHandleNatives
916 // They are the private interface between this JVM and the HotSpot-specific
917 // Java code that implements JSR 292 method handles.
918 //
919 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
920 // that intrinsic (non-JNI) native methods are defined in HotSpot.
921 //
922
923 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
924 switch (which) {
925 case MethodHandles::GC_COUNT_GWT:
926 #ifdef COMPILER2
927 return true;
928 #else
929 return false;
930 #endif
931 }
932 return 0;
933 }
934 JVM_END
935
936 #ifndef PRODUCT
937 #define EACH_NAMED_CON(template, requirement) \
938 template(MethodHandles,GC_COUNT_GWT) \
939 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
940 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
941 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
942 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
943 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
944 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
945 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
946 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
947 template(MethodHandles,GC_LAMBDA_SUPPORT) \
948 /*end*/
949
950 #define IGNORE_REQ(req_expr) /* req_expr */
951 #define ONE_PLUS(scope,value) 1+
952 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
953 #define VALUE_COMMA(scope,value) scope::value,
954 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
955 #define STRING_NULL(scope,value) #value "\0"
956 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
957
958 static bool advertise_con_value(int which) {
959 if (which < 0) return false;
960 bool ok = true;
961 int count = 0;
962 #define INC_COUNT(scope,value) \
963 ++count;
964 #define CHECK_REQ(req_expr) \
965 if (which < count) return ok; \
966 ok = (req_expr);
967 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
968 #undef INC_COUNT
969 #undef CHECK_REQ
970 assert(count == con_value_count, "");
971 if (which < count) return ok;
972 return false;
973 }
974
975 #undef ONE_PLUS
976 #undef VALUE_COMMA
977 #undef STRING_NULL
978 #undef EACH_NAMED_CON
979 #endif // PRODUCT
980
981 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
982 #ifndef PRODUCT
983 if (advertise_con_value(which)) {
984 assert(which >= 0 && which < con_value_count, "");
985 int con = con_values[which];
986 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
987 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
988 const char* str = &con_names[0];
989 for (int i = 0; i < which; i++)
990 str += strlen(str) + 1; // skip name and null
991 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
992 box->obj_at_put(0, name);
993 }
994 return con;
995 }
996 #endif
997 return 0;
998 }
999 JVM_END
1000
1001 // void init(MemberName self, AccessibleObject ref)
1002 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1003 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1004 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1005 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1006 oop target_oop = JNIHandles::resolve_non_null(target_jh);
1007 MethodHandles::init_MemberName(mname(), target_oop);
1008 }
1009 JVM_END
1010
1011 // void expand(MemberName self)
1012 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1013 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1014 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1015 MethodHandles::expand_MemberName(mname, 0, CHECK);
1016 }
1017 JVM_END
1018
1019 // void resolve(MemberName self, Class<?> caller)
1020 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1021 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1022 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1023
1024 // The trusted Java code that calls this method should already have performed
1025 // access checks on behalf of the given caller. But, we can verify this.
1026 if (VerifyMethodHandles && caller_jh != NULL &&
1027 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1028 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1029 if (reference_klass != NULL) {
1030 // Emulate LinkResolver::check_klass_accessability.
1031 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1032 if (!Reflection::verify_class_access(caller,
1033 reference_klass,
1034 true)) {
1035 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name());
1036 }
1037 }
1038 }
1039
1040 Handle resolved = MethodHandles::resolve_MemberName(mname, CHECK_NULL);
1041 if (resolved.is_null()) {
1042 int flags = java_lang_invoke_MemberName::flags(mname());
1043 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1044 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1045 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1046 }
1047 if ((flags & ALL_KINDS) == IS_FIELD) {
1048 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1049 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1050 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1051 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1052 } else {
1053 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1054 }
1055 }
1056
1057 return JNIHandles::make_local(THREAD, resolved());
1058 }
1059 JVM_END
1060
1061 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1062 if (mname == NULL ||
1063 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1064 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1065 } else {
1066 int flags = java_lang_invoke_MemberName::flags(mname);
1067 if ((flags & IS_FIELD) != 0 &&
1068 (must_be_static
1069 ? (flags & JVM_ACC_STATIC) != 0
1070 : (flags & JVM_ACC_STATIC) == 0)) {
1071 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1072 return (jlong) vmindex;
1073 }
1074 }
1075 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1076 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1077 return 0;
1078 }
1079
1080 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1081 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1082 }
1083 JVM_END
1084
1085 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1086 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1087 }
1088 JVM_END
1089
1090 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1091 // use the other function to perform sanity checks:
1092 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1093 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1094 return JNIHandles::make_local(THREAD, clazz);
1095 }
1096 JVM_END
1097
1098 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1099 if (mname_jh == NULL) return NULL;
1100 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1101 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1102 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1103 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1104 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1105 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1106 result->obj_at_put(0, x);
1107 x = NULL;
1108 if (vmtarget == NULL) {
1109 x = NULL;
1110 } else if (vmtarget->is_klass()) {
1111 x = Klass::cast((Klass*) vmtarget)->java_mirror();
1112 } else if (vmtarget->is_method()) {
1113 Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL);
1114 x = MethodHandles::init_method_MemberName(mname2(), (Method*)vmtarget, false, NULL);
1115 }
1116 result->obj_at_put(1, x);
1117 return JNIHandles::make_local(env, result());
1118 }
1119 JVM_END
1120
1121
1122
1123 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1124 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1125 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1126 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1127 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1128 if (clazz_jh == NULL || results_jh == NULL) return -1;
1129 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1130
1131 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1132 if (results.is_null() || !results->is_objArray()) return -1;
1133
1134 TempNewSymbol name = NULL;
1135 TempNewSymbol sig = NULL;
1136 if (name_jh != NULL) {
1137 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1138 if (name == NULL) return 0; // a match is not possible
1139 }
1140 if (sig_jh != NULL) {
1141 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1142 if (sig == NULL) return 0; // a match is not possible
1143 }
1144
1145 KlassHandle caller;
1146 if (caller_jh != NULL) {
1147 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1148 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1149 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1150 }
1151
1152 if (name != NULL && sig != NULL && results.not_null()) {
1153 // try a direct resolve
1154 // %%% TO DO
1155 }
1156
1157 int res = MethodHandles::find_MemberNames(k(), name, sig, mflags,
1158 caller(), skip, results());
1159 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1160 return res;
1161 }
1162 JVM_END
1163
1164 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1165 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1166 Handle target (THREAD, JNIHandles::resolve(target_jh));
1167 {
1168 // Walk all nmethods depending on this call site.
1169 MutexLocker mu(Compile_lock, thread);
1170 Universe::flush_dependents_on(call_site, target);
1171 }
1172 java_lang_invoke_CallSite::set_target(call_site(), target());
1173 }
1174 JVM_END
1175
1176 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1177 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1178 Handle target (THREAD, JNIHandles::resolve(target_jh));
1179 {
1180 // Walk all nmethods depending on this call site.
1181 MutexLocker mu(Compile_lock, thread);
1182 Universe::flush_dependents_on(call_site, target);
1183 }
1184 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1185 }
1186 JVM_END
1187
1188 /// JVM_RegisterMethodHandleMethods
1189
1190 #undef CS // Solaris builds complain
1191
1192 #define LANG "Ljava/lang/"
1193 #define JLINV "Ljava/lang/invoke/"
1194
1195 #define OBJ LANG"Object;"
1196 #define CLS LANG"Class;"
1197 #define STRG LANG"String;"
1198 #define CS JLINV"CallSite;"
1199 #define MT JLINV"MethodType;"
1200 #define MH JLINV"MethodHandle;"
1201 #define MEM JLINV"MemberName;"
1202
1203 #define CC (char*) /*cast a literal from (const char*)*/
1204 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1205
1206 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1207 static JNINativeMethod required_methods_JDK8[] = {
1208 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1209 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1210 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1211 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1212 // static native int getNamedCon(int which, Object[] name)
1213 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1214 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1215 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1216 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1217 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1218 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1219 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1220 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1221 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1222 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1223 };
1224
1225 // This one function is exported, used by NativeLookup.
1226
1227 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1228 if (!EnableInvokeDynamic) {
1229 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
1230 return; // bind nothing
1231 }
1232
1233 assert(!MethodHandles::enabled(), "must not be enabled");
1234 bool enable_MH = true;
1235
1236 jclass MH_class = NULL;
1237 if (SystemDictionary::MethodHandle_klass() == NULL) {
1238 enable_MH = false;
1239 } else {
1240 oop mirror = Klass::cast(SystemDictionary::MethodHandle_klass())->java_mirror();
1241 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1242 }
1243
1244 int status;
1245
1246 if (enable_MH) {
1247 ThreadToNativeFromVM ttnfv(thread);
1248
1249 status = env->RegisterNatives(MHN_class, required_methods_JDK8, sizeof(required_methods_JDK8)/sizeof(JNINativeMethod));
1250 if (status != JNI_OK || env->ExceptionOccurred()) {
1251 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1252 enable_MH = false;
1253 env->ExceptionClear();
1254 }
1255 }
1256
1257 if (TraceInvokeDynamic) {
1258 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1259 }
1260
1261 if (enable_MH) {
1262 MethodHandles::generate_adapters();
1263 MethodHandles::set_enabled(true);
1264 }
1265 }
1266 JVM_END