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/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, "CodeCache: no room for MethodHandles adapters");
71 {
72 CodeBuffer code(_adapter_code);
73 MethodHandlesAdapterGenerator g(&code);
74 g.generate();
75 code.log_section_sizes("MethodHandlesAdapterBlob");
76 }
77 }
78
79 //------------------------------------------------------------------------------
80 // MethodHandlesAdapterGenerator::generate
81 //
82 void MethodHandlesAdapterGenerator::generate() {
83 // Generate generic method handle adapters.
84 // Generate interpreter entries
85 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
86 mk <= Interpreter::method_handle_invoke_LAST;
87 mk = Interpreter::MethodKind(1 + (int)mk)) {
88 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
89 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
90 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
91 if (entry != NULL) {
92 Interpreter::set_entry_for_kind(mk, entry);
93 }
94 // If the entry is not set, it will throw AbstractMethodError.
95 }
96 }
97
98 void MethodHandles::set_enabled(bool z) {
99 if (_enabled != z) {
100 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
101 _enabled = z;
102 }
103 }
104
105 // MemberName support
106
107 // import java_lang_invoke_MemberName.*
108 enum {
109 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
110 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
111 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
112 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
113 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
114 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
115 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
116 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
117 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
118 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
119 };
120
121 Handle MethodHandles::new_MemberName(TRAPS) {
122 Handle empty;
123 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
124 if (!k->is_initialized()) k->initialize(CHECK_(empty));
125 return Handle(THREAD, k->allocate_instance(THREAD));
126 }
127
128 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
129 Thread* thread = Thread::current();
130 oop target_oop = target();
131 Klass* target_klass = target_oop->klass();
132 if (target_klass == SystemDictionary::reflect_Field_klass()) {
133 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
134 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
135 int mods = java_lang_reflect_Field::modifiers(target_oop);
136 oop type = java_lang_reflect_Field::type(target_oop);
137 oop name = java_lang_reflect_Field::name(target_oop);
138 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
139 intptr_t offset = InstanceKlass::cast(k())->field_offset(slot);
140 return init_field_MemberName(mname, k, accessFlags_from(mods), type, name, offset);
141 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
142 oop clazz = java_lang_reflect_Method::clazz(target_oop);
143 int slot = java_lang_reflect_Method::slot(target_oop);
144 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
145 if (!k.is_null() && k->oop_is_instance()) {
146 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
147 return init_method_MemberName(mname, m, true, k);
148 }
149 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
150 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
151 int slot = java_lang_reflect_Constructor::slot(target_oop);
152 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
153 if (!k.is_null() && k->oop_is_instance()) {
154 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
155 return init_method_MemberName(mname, m, false, k);
156 }
157 } else if (target_klass == SystemDictionary::MemberName_klass()) {
158 // Note: This only works if the MemberName has already been resolved.
159 oop clazz = java_lang_invoke_MemberName::clazz(target_oop);
160 int flags = java_lang_invoke_MemberName::flags(target_oop);
161 Metadata* vmtarget=java_lang_invoke_MemberName::vmtarget(target_oop);
162 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(target_oop);
163 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
164 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
165 if (vmtarget == NULL) return NULL; // not resolved
166 if ((flags & IS_FIELD) != 0) {
167 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
168 int basic_mods = (ref_kind_is_static(ref_kind) ? JVM_ACC_STATIC : 0);
169 // FIXME: how does k (receiver_limit) contribute?
170 KlassHandle k_vmtarget(thread, (Klass*)vmtarget);
171 return init_field_MemberName(mname, k_vmtarget, accessFlags_from(basic_mods), NULL, NULL, vmindex);
172 } else if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
173 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
174 return init_method_MemberName(mname, (Method*)vmtarget, ref_kind_does_dispatch(ref_kind), k);
175 } else {
176 return NULL;
177 }
178 }
179 return NULL;
180 }
181
182 oop MethodHandles::init_method_MemberName(Handle mname, Method* m, bool do_dispatch,
183 KlassHandle receiver_limit_h) {
184 Klass* receiver_limit = receiver_limit_h();
185 AccessFlags mods = m->access_flags();
186 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
187 int vmindex = Method::nonvirtual_vtable_index; // implies never any dispatch
188 Klass* mklass = m->method_holder();
189 if (receiver_limit == NULL)
190 receiver_limit = mklass;
191 if (m->is_initializer()) {
192 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
193 } else if (mods.is_static()) {
194 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
195 } else if (receiver_limit != mklass &&
196 !receiver_limit->is_subtype_of(mklass)) {
197 return NULL; // bad receiver limit
198 } else if (receiver_limit->is_interface() &&
199 mklass->is_interface()) {
200 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
201 receiver_limit = mklass; // ignore passed-in limit; interfaces are interconvertible
202 vmindex = klassItable::compute_itable_index(m);
203 } else if (mklass != receiver_limit && mklass->is_interface()) {
204 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
205 // it is a miranda method, so m->vtable_index is not what we want
206 ResourceMark rm;
207 klassVtable* vt = InstanceKlass::cast(receiver_limit)->vtable();
208 vmindex = vt->index_of_miranda(m->name(), m->signature());
209 } else if (!do_dispatch || m->can_be_statically_bound()) {
210 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
211 } else {
212 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
213 vmindex = m->vtable_index();
214 }
215
216 // @CallerSensitive annotation detected
217 if (m->caller_sensitive()) {
218 flags |= CALLER_SENSITIVE;
219 }
220
221 oop mname_oop = mname();
222 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
223 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m);
224 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
225 java_lang_invoke_MemberName::set_clazz( mname_oop, receiver_limit->java_mirror());
226 // Note: name and type can be lazily computed by resolve_MemberName,
227 // if Java code needs them as resolved String and MethodType objects.
228 // The clazz must be eagerly stored, because it provides a GC
229 // root to help keep alive the Method*.
230 // If relevant, the vtable or itable value is stored as vmindex.
231 // This is done eagerly, since it is readily available without
232 // constructing any new objects.
233 // TO DO: maybe intern mname_oop
234 m->method_holder()->add_member_name(mname);
235 return mname();
236 }
237
238 Handle MethodHandles::init_method_MemberName(Handle mname, CallInfo& info, TRAPS) {
239 Handle empty;
240 if (info.resolved_appendix().not_null()) {
241 // The resolved MemberName must not be accompanied by an appendix argument,
242 // since there is no way to bind this value into the MemberName.
243 // Caller is responsible to prevent this from happening.
244 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
245 }
246 methodHandle m = info.resolved_method();
247 KlassHandle defc = info.resolved_klass();
248 int vmindex = -1;
249 if (defc->is_interface() && m->method_holder()->is_interface()) {
250 // LinkResolver does not report itable indexes! (fix this?)
251 vmindex = klassItable::compute_itable_index(m());
252 } else if (m->can_be_statically_bound()) {
253 // LinkResolver reports vtable index even for final methods!
254 vmindex = Method::nonvirtual_vtable_index;
255 } else {
256 vmindex = info.vtable_index();
257 }
258 oop res = init_method_MemberName(mname, m(), (vmindex >= 0), defc());
259 assert(res == NULL || (java_lang_invoke_MemberName::vmindex(res) == vmindex), "");
260 return Handle(THREAD, res);
261 }
262
263 oop MethodHandles::init_field_MemberName(Handle mname, KlassHandle field_holder,
264 AccessFlags mods, oop type, oop name,
265 intptr_t offset, bool is_setter) {
266 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
267 flags |= IS_FIELD | ((mods.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
268 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
269 Metadata* vmtarget = field_holder();
270 int vmindex = offset; // determines the field uniquely when combined with static bit
271 oop mname_oop = mname();
272 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
273 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
274 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
275 java_lang_invoke_MemberName::set_clazz(mname_oop, field_holder->java_mirror());
276 if (name != NULL)
277 java_lang_invoke_MemberName::set_name(mname_oop, name);
278 if (type != NULL)
279 java_lang_invoke_MemberName::set_type(mname_oop, type);
280 // Note: name and type can be lazily computed by resolve_MemberName,
281 // if Java code needs them as resolved String and Class objects.
282 // Note that the incoming type oop might be pre-resolved (non-null).
283 // The base clazz and field offset (vmindex) must be eagerly stored,
284 // because they unambiguously identify the field.
285 // Although the fieldDescriptor::_index would also identify the field,
286 // we do not use it, because it is harder to decode.
287 // TO DO: maybe intern mname_oop
288 InstanceKlass::cast(field_holder())->add_member_name(mname);
289 return mname();
290 }
291
292 Handle MethodHandles::init_field_MemberName(Handle mname, FieldAccessInfo& info, TRAPS) {
293 return Handle();
294 #if 0 // FIXME
295 KlassHandle field_holder = info.klass();
296 intptr_t field_offset = info.field_offset();
297 return init_field_MemberName(mname_oop, field_holder(),
298 info.access_flags(),
299 type, name,
300 field_offset, false /*is_setter*/);
301 #endif
302 }
303
304
305 // JVM 2.9 Special Methods:
306 // A method is signature polymorphic if and only if all of the following conditions hold :
307 // * It is declared in the java.lang.invoke.MethodHandle class.
308 // * It has a single formal parameter of type Object[].
309 // * It has a return type of Object.
310 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
311 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
312 if (klass == NULL)
313 return false;
314 // The following test will fail spuriously during bootstrap of MethodHandle itself:
315 // if (klass != SystemDictionary::MethodHandle_klass())
316 // Test the name instead:
317 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
318 return false;
319 Symbol* poly_sig = vmSymbols::object_array_object_signature();
320 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
321 if (m == NULL) return false;
322 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
323 int flags = m->access_flags().as_int();
324 return (flags & required) == required;
325 }
326
327
328 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
329 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
330 switch (iid) {
331 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
332 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
333 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
334 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
335 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
336 }
337 assert(false, "");
338 return 0;
339 }
340
341 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
342 switch (iid) {
343 case vmIntrinsics::_invokeBasic: return 0;
344 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
345 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
346 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
347 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
348 }
349 assert(false, err_msg("iid=%d", iid));
350 return 0;
351 }
352
353 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
354 vmSymbols::SID name_id = vmSymbols::find_sid(name);
355 switch (name_id) {
356 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
357 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
358 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
359 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
360
361 // There is one static signature-polymorphic method for each JVM invocation mode.
362 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
363 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
364 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
365 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
366 }
367
368 // Cover the case of invokeExact and any future variants of invokeFoo.
369 Klass* mh_klass = SystemDictionary::well_known_klass(
370 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
371 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
372 return vmIntrinsics::_invokeGeneric;
373
374 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
375 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
376 return vmIntrinsics::_none;
377 }
378
379 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
380 if (klass != NULL &&
381 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
382 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
383 if (iid != vmIntrinsics::_none)
384 return iid;
385 if (is_method_handle_invoke_name(klass, name))
386 return vmIntrinsics::_invokeGeneric;
387 }
388 return vmIntrinsics::_none;
389 }
390
391
392 // convert the external string or reflective type to an internal signature
393 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
394 if (java_lang_invoke_MethodType::is_instance(type_str)) {
395 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
396 } else if (java_lang_Class::is_instance(type_str)) {
397 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
398 } else if (java_lang_String::is_instance(type_str)) {
399 if (intern_if_not_found) {
400 return java_lang_String::as_symbol(type_str, CHECK_NULL);
401 } else {
402 return java_lang_String::as_symbol_or_null(type_str);
403 }
404 } else {
405 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
406 }
407 }
408
409 static const char OBJ_SIG[] = "Ljava/lang/Object;";
410 enum { OBJ_SIG_LEN = 18 };
411
412 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
413 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
414 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
415 const int len = sig->utf8_length();
416 for (int i = 0; i < len; i++) {
417 switch (sig->byte_at(i)) {
418 case 'L':
419 // only java/lang/Object is valid here
420 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
421 return false;
422 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
423 continue;
424 case '(': case ')': case 'V':
425 case 'I': case 'J': case 'F': case 'D':
426 continue;
427 //case '[':
428 //case 'Z': case 'B': case 'C': case 'S':
429 default:
430 return false;
431 }
432 }
433 return true;
434 }
435
436 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
437 Symbol* bsig = NULL;
438 if (sig == NULL) {
439 return sig;
440 } else if (is_basic_type_signature(sig)) {
441 sig->increment_refcount();
442 return sig; // that was easy
443 } else if (sig->byte_at(0) != '(') {
444 BasicType bt = char2type(sig->byte_at(0));
445 if (is_subword_type(bt)) {
446 bsig = vmSymbols::int_signature();
447 } else {
448 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
449 bsig = vmSymbols::object_signature();
450 }
451 } else {
452 ResourceMark rm;
453 stringStream buffer(128);
454 buffer.put('(');
455 int arg_pos = 0, keep_arg_pos = -1;
456 if (keep_last_arg)
457 keep_arg_pos = ArgumentCount(sig).size() - 1;
458 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
459 BasicType bt = ss.type();
460 size_t this_arg_pos = buffer.size();
461 if (ss.at_return_type()) {
462 buffer.put(')');
463 }
464 if (arg_pos == keep_arg_pos) {
465 buffer.write((char*) ss.raw_bytes(),
466 (int) ss.raw_length());
467 } else if (bt == T_OBJECT || bt == T_ARRAY) {
468 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
469 } else {
470 if (is_subword_type(bt))
471 bt = T_INT;
472 buffer.put(type2char(bt));
473 }
474 arg_pos++;
475 }
476 const char* sigstr = buffer.base();
477 int siglen = (int) buffer.size();
478 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
479 }
480 assert(is_basic_type_signature(bsig) ||
481 // detune assert in case the injected argument is not a basic type:
482 keep_last_arg, "");
483 return bsig;
484 }
485
486 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
487 Symbol* sig,
488 bool keep_arrays,
489 bool keep_basic_names) {
490 st = st ? st : tty;
491 int len = sig->utf8_length();
492 int array = 0;
493 bool prev_type = false;
494 for (int i = 0; i < len; i++) {
495 char ch = sig->byte_at(i);
496 switch (ch) {
497 case '(': case ')':
498 prev_type = false;
499 st->put(ch);
500 continue;
501 case '[':
502 if (!keep_basic_names && keep_arrays)
503 st->put(ch);
504 array++;
505 continue;
506 case 'L':
507 {
508 if (prev_type) st->put(',');
509 int start = i+1, slash = start;
510 while (++i < len && (ch = sig->byte_at(i)) != ';') {
511 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
512 }
513 if (slash < i) start = slash;
514 if (!keep_basic_names) {
515 st->put('L');
516 } else {
517 for (int j = start; j < i; j++)
518 st->put(sig->byte_at(j));
519 prev_type = true;
520 }
521 break;
522 }
523 default:
524 {
525 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
526 ch = '[';
527 array = 0;
528 }
529 if (prev_type) st->put(',');
530 const char* n = NULL;
531 if (keep_basic_names)
532 n = type2name(char2type(ch));
533 if (n == NULL) {
534 // unknown letter, or we don't want to know its name
535 st->put(ch);
536 } else {
537 st->print(n);
538 prev_type = true;
539 }
540 break;
541 }
542 }
543 // Switch break goes here to take care of array suffix:
544 if (prev_type) {
545 while (array > 0) {
546 st->print("[]");
547 --array;
548 }
549 }
550 array = 0;
551 }
552 }
553
554
555
556 static oop object_java_mirror() {
557 return SystemDictionary::Object_klass()->java_mirror();
558 }
559
560 static oop field_name_or_null(Symbol* s) {
561 if (s == NULL) return NULL;
562 return StringTable::lookup(s);
563 }
564
565 static oop field_signature_type_or_null(Symbol* s) {
566 if (s == NULL) return NULL;
567 BasicType bt = FieldType::basic_type(s);
568 if (is_java_primitive(bt)) {
569 assert(s->utf8_length() == 1, "");
570 return java_lang_Class::primitive_mirror(bt);
571 }
572 // Here are some more short cuts for common types.
573 // They are optional, since reference types can be resolved lazily.
574 if (bt == T_OBJECT) {
575 if (s == vmSymbols::object_signature()) {
576 return object_java_mirror();
577 } else if (s == vmSymbols::class_signature()) {
578 return SystemDictionary::Class_klass()->java_mirror();
579 } else if (s == vmSymbols::string_signature()) {
580 return SystemDictionary::String_klass()->java_mirror();
581 }
582 }
583 return NULL;
584 }
585
586
587 // An unresolved member name is a mere symbolic reference.
588 // Resolving it plants a vmtarget/vmindex in it,
589 // which refers directly to JVM internals.
590 Handle MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
591 Handle empty;
592 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
593
594 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
595 // Already resolved.
596 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
597 assert(vmindex >= Method::nonvirtual_vtable_index, "");
598 return mname;
599 }
600
601 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
602 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
603 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
604 int flags = java_lang_invoke_MemberName::flags(mname());
605 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
606 if (!ref_kind_is_valid(ref_kind)) {
607 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
608 }
609
610 DEBUG_ONLY(int old_vmindex);
611 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
612
613 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
614 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
615 }
616
617 instanceKlassHandle defc;
618 {
619 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
620 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
621 if (!defc_klass->oop_is_instance()) {
622 if (!defc_klass->oop_is_array()) return empty;
623 defc_klass = SystemDictionary::Object_klass();
624 }
625 defc = instanceKlassHandle(THREAD, defc_klass);
626 }
627 if (defc.is_null()) {
628 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
629 }
630 defc->link_class(CHECK_(empty)); // possible safepoint
631
632 // convert the external string name to an internal symbol
633 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
634 if (name == NULL) return empty; // no such name
635 if (name == vmSymbols::class_initializer_name())
636 return empty; // illegal name
637
638 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
639 if ((flags & ALL_KINDS) == IS_METHOD &&
640 (defc() == SystemDictionary::MethodHandle_klass()) &&
641 (ref_kind == JVM_REF_invokeVirtual ||
642 ref_kind == JVM_REF_invokeSpecial ||
643 // static invocation mode is required for _linkToVirtual, etc.:
644 ref_kind == JVM_REF_invokeStatic)) {
645 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
646 if (iid != vmIntrinsics::_none &&
647 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
648 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
649 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
650 mh_invoke_id = iid;
651 }
652 }
653
654 // convert the external string or reflective type to an internal signature
655 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
656 if (type == NULL) return empty; // no such signature exists in the VM
657
658 // Time to do the lookup.
659 switch (flags & ALL_KINDS) {
660 case IS_METHOD:
661 {
662 CallInfo result;
663 bool do_dispatch = true; // default, neutral setting
664 {
665 assert(!HAS_PENDING_EXCEPTION, "");
666 if (ref_kind == JVM_REF_invokeStatic) {
667 //do_dispatch = false; // no need, since statics are never dispatched
668 LinkResolver::resolve_static_call(result,
669 defc, name, type, KlassHandle(), false, false, THREAD);
670 } else if (ref_kind == JVM_REF_invokeInterface) {
671 LinkResolver::resolve_interface_call(result, Handle(), defc,
672 defc, name, type, KlassHandle(), false, false, THREAD);
673 } else if (mh_invoke_id != vmIntrinsics::_none) {
674 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
675 LinkResolver::resolve_handle_call(result,
676 defc, name, type, KlassHandle(), THREAD);
677 } else if (ref_kind == JVM_REF_invokeSpecial) {
678 do_dispatch = false; // force non-virtual linkage
679 LinkResolver::resolve_special_call(result,
680 defc, name, type, KlassHandle(), false, THREAD);
681 } else if (ref_kind == JVM_REF_invokeVirtual) {
682 LinkResolver::resolve_virtual_call(result, Handle(), defc,
683 defc, name, type, KlassHandle(), false, false, THREAD);
684 } else {
685 assert(false, err_msg("ref_kind=%d", ref_kind));
686 }
687 if (HAS_PENDING_EXCEPTION) {
688 return empty;
689 }
690 }
691 return init_method_MemberName(mname, result, THREAD);
692 }
693 case IS_CONSTRUCTOR:
694 {
695 CallInfo result;
696 {
697 assert(!HAS_PENDING_EXCEPTION, "");
698 if (name == vmSymbols::object_initializer_name()) {
699 LinkResolver::resolve_special_call(result,
700 defc, name, type, KlassHandle(), false, THREAD);
701 } else {
702 break; // will throw after end of switch
703 }
704 if (HAS_PENDING_EXCEPTION) {
705 return empty;
706 }
707 }
708 assert(result.is_statically_bound(), "");
709 return init_method_MemberName(mname, result, THREAD);
710 }
711 case IS_FIELD:
712 {
713 // This is taken from LinkResolver::resolve_field, sans access checks.
714 fieldDescriptor fd; // find_field initializes fd if found
715 KlassHandle sel_klass(THREAD, InstanceKlass::cast(defc())->find_field(name, type, &fd));
716 // check if field exists; i.e., if a klass containing the field def has been selected
717 if (sel_klass.is_null()) return empty; // should not happen
718 oop type = field_signature_type_or_null(fd.signature());
719 oop name = field_name_or_null(fd.name());
720 bool is_setter = (ref_kind_is_valid(ref_kind) && ref_kind_is_setter(ref_kind));
721 mname = Handle(THREAD,
722 init_field_MemberName(mname, sel_klass,
723 fd.access_flags(), type, name, fd.offset(), is_setter));
724 return mname;
725 }
726 default:
727 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
728 }
729
730 return empty;
731 }
732
733 // Conversely, a member name which is only initialized from JVM internals
734 // may have null defc, name, and type fields.
735 // Resolving it plants a vmtarget/vmindex in it,
736 // which refers directly to JVM internals.
737 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
738 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
739 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
740 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
741 if (vmtarget == NULL) {
742 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
743 }
744
745 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
746 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
747 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
748 int flags = java_lang_invoke_MemberName::flags(mname());
749
750 if (suppress != 0) {
751 if (suppress & _suppress_defc) have_defc = true;
752 if (suppress & _suppress_name) have_name = true;
753 if (suppress & _suppress_type) have_type = true;
754 }
755
756 if (have_defc && have_name && have_type) return; // nothing needed
757
758 switch (flags & ALL_KINDS) {
759 case IS_METHOD:
760 case IS_CONSTRUCTOR:
761 {
762 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
763 methodHandle m(THREAD, (Method*)vmtarget);
764 DEBUG_ONLY(vmtarget = NULL); // safety
765 if (m.is_null()) break;
766 if (!have_defc) {
767 InstanceKlass* defc = m->method_holder();
768 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
769 }
770 if (!have_name) {
771 //not java_lang_String::create_from_symbol; let's intern member names
772 Handle name = StringTable::intern(m->name(), CHECK);
773 java_lang_invoke_MemberName::set_name(mname(), name());
774 }
775 if (!have_type) {
776 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
777 java_lang_invoke_MemberName::set_type(mname(), type());
778 }
779 return;
780 }
781 case IS_FIELD:
782 {
783 // This is taken from LinkResolver::resolve_field, sans access checks.
784 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
785 if (!((Klass*) vmtarget)->oop_is_instance()) break;
786 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
787 DEBUG_ONLY(vmtarget = NULL); // safety
788 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
789 fieldDescriptor fd; // find_field initializes fd if found
790 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
791 break; // cannot expand
792 if (!have_defc) {
793 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
794 }
795 if (!have_name) {
796 //not java_lang_String::create_from_symbol; let's intern member names
797 Handle name = StringTable::intern(fd.name(), CHECK);
798 java_lang_invoke_MemberName::set_name(mname(), name());
799 }
800 if (!have_type) {
801 // If it is a primitive field type, don't mess with short strings like "I".
802 Handle type = field_signature_type_or_null(fd.signature());
803 if (type.is_null()) {
804 java_lang_String::create_from_symbol(fd.signature(), CHECK);
805 }
806 java_lang_invoke_MemberName::set_type(mname(), type());
807 }
808 return;
809 }
810 }
811 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
812 }
813
814 int MethodHandles::find_MemberNames(KlassHandle k,
815 Symbol* name, Symbol* sig,
816 int mflags, KlassHandle caller,
817 int skip, objArrayHandle results) {
818 // %%% take caller into account!
819
820 Thread* thread = Thread::current();
821
822 if (k.is_null() || !k->oop_is_instance()) return -1;
823
824 int rfill = 0, rlimit = results->length(), rskip = skip;
825 // overflow measurement:
826 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
827
828 int match_flags = mflags;
829 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
830 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
831 bool local_only = !(search_superc | search_intfc);
832 bool classes_only = false;
833
834 if (name != NULL) {
835 if (name->utf8_length() == 0) return 0; // a match is not possible
836 }
837 if (sig != NULL) {
838 if (sig->utf8_length() == 0) return 0; // a match is not possible
839 if (sig->byte_at(0) == '(')
840 match_flags &= ~(IS_FIELD | IS_TYPE);
841 else
842 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
843 }
844
845 if ((match_flags & IS_TYPE) != 0) {
846 // NYI, and Core Reflection works quite well for this query
847 }
848
849 if ((match_flags & IS_FIELD) != 0) {
850 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
851 if (name != NULL && st.name() != name)
852 continue;
853 if (sig != NULL && st.signature() != sig)
854 continue;
855 // passed the filters
856 if (rskip > 0) {
857 --rskip;
858 } else if (rfill < rlimit) {
859 Handle result(thread, results->obj_at(rfill++));
860 if (!java_lang_invoke_MemberName::is_instance(result()))
861 return -99; // caller bug!
862 oop type = field_signature_type_or_null(st.signature());
863 oop name = field_name_or_null(st.name());
864 oop saved = MethodHandles::init_field_MemberName(result, st.klass(),
865 st.access_flags(), type, name,
866 st.offset());
867 if (saved != result())
868 results->obj_at_put(rfill-1, saved); // show saved instance to user
869 } else if (++overflow >= overflow_limit) {
870 match_flags = 0; break; // got tired of looking at overflow
871 }
872 }
873 }
874
875 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
876 // watch out for these guys:
877 Symbol* init_name = vmSymbols::object_initializer_name();
878 Symbol* clinit_name = vmSymbols::class_initializer_name();
879 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
880 bool negate_name_test = false;
881 // fix name so that it captures the intention of IS_CONSTRUCTOR
882 if (!(match_flags & IS_METHOD)) {
883 // constructors only
884 if (name == NULL) {
885 name = init_name;
886 } else if (name != init_name) {
887 return 0; // no constructors of this method name
888 }
889 } else if (!(match_flags & IS_CONSTRUCTOR)) {
890 // methods only
891 if (name == NULL) {
892 name = init_name;
893 negate_name_test = true; // if we see the name, we *omit* the entry
894 } else if (name == init_name) {
895 return 0; // no methods of this constructor name
896 }
897 } else {
898 // caller will accept either sort; no need to adjust name
899 }
900 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
901 Method* m = st.method();
902 Symbol* m_name = m->name();
903 if (m_name == clinit_name)
904 continue;
905 if (name != NULL && ((m_name != name) ^ negate_name_test))
906 continue;
907 if (sig != NULL && m->signature() != sig)
908 continue;
909 // passed the filters
910 if (rskip > 0) {
911 --rskip;
912 } else if (rfill < rlimit) {
913 Handle result(thread, results->obj_at(rfill++));
914 if (!java_lang_invoke_MemberName::is_instance(result()))
915 return -99; // caller bug!
916 oop saved = MethodHandles::init_method_MemberName(result, m, true, NULL);
917 if (saved != result())
918 results->obj_at_put(rfill-1, saved); // show saved instance to user
919 } else if (++overflow >= overflow_limit) {
920 match_flags = 0; break; // got tired of looking at overflow
921 }
922 }
923 }
924
925 // return number of elements we at leasted wanted to initialize
926 return rfill + overflow;
927 }
928
929 //------------------------------------------------------------------------------
930 // MemberNameTable
931 //
932
933 MemberNameTable::MemberNameTable() : GrowableArray<jweak>(10, true) {
934 }
935
936 MemberNameTable::~MemberNameTable() {
937 int len = this->length();
938
939 for (int idx = 0; idx < len; idx++) {
940 jweak ref = this->at(idx);
941 JNIHandles::destroy_weak_global(ref);
942 }
943 }
944
945 // Return entry index if found, return -1 otherwise.
946 int MemberNameTable::find_member_name(oop mem_name) {
947 int len = this->length();
948
949 for (int idx = 0; idx < len; idx++) {
950 jweak ref = this->at(idx);
951 oop entry = JNIHandles::resolve(ref);
952 if (entry == mem_name) {
953 return idx;
954 }
955 }
956 return -1;
957 }
958
959 void MemberNameTable::add_member_name(jweak mem_name_wref) {
960 oop mem_name = JNIHandles::resolve(mem_name_wref);
961
962 // Each member name may appear just once: add only if not found
963 if (find_member_name(mem_name) == -1) {
964 this->append(mem_name_wref);
965 }
966 }
967
968 #if INCLUDE_JVMTI
969 // It is called at safepoint only from the MemberNameTable::adjust_method_entries().
970 // No synchronization is needed.
971 oop MemberNameTable::find_member_name_by_method(Method* old_method) {
972 oop found = NULL;
973 int len = this->length();
974
975 for (int idx = 0; idx < len; idx++) {
976 oop mem_name = JNIHandles::resolve(this->at(idx));
977 if (mem_name == NULL) {
978 continue;
979 }
980 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
981 if (method == old_method) {
982 found = mem_name;
983 break;
984 }
985 }
986 return found;
987 }
988
989 // It is called at safepoint only
990 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
991 int methods_length, bool *trace_name_printed) {
992 // search the MemberNameTable for uses of either obsolete or EMCP methods
993 for (int j = 0; j < methods_length; j++) {
994 Method* old_method = old_methods[j];
995 Method* new_method = new_methods[j];
996 oop mem_name = find_member_name_by_method(old_method);
997 if (mem_name != NULL) {
998 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method);
999
1000 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1001 if (!(*trace_name_printed)) {
1002 // RC_TRACE_MESG macro has an embedded ResourceMark
1003 RC_TRACE_MESG(("adjust: name=%s",
1004 old_method->method_holder()->external_name()));
1005 *trace_name_printed = true;
1006 }
1007 // RC_TRACE macro has an embedded ResourceMark
1008 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
1009 new_method->name()->as_C_string(),
1010 new_method->signature()->as_C_string()));
1011 }
1012 }
1013 }
1014 }
1015 #endif // INCLUDE_JVMTI
1016
1017 //
1018 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1019 // They are the private interface between this JVM and the HotSpot-specific
1020 // Java code that implements JSR 292 method handles.
1021 //
1022 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1023 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1024 //
1025
1026 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
1027 switch (which) {
1028 case MethodHandles::GC_COUNT_GWT:
1029 #ifdef COMPILER2
1030 return true;
1031 #else
1032 return false;
1033 #endif
1034 }
1035 return 0;
1036 }
1037 JVM_END
1038
1039 #ifndef PRODUCT
1040 #define EACH_NAMED_CON(template, requirement) \
1041 template(MethodHandles,GC_COUNT_GWT) \
1042 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1043 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1044 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1045 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1046 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1047 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1048 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1049 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1050 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1051 template(MethodHandles,GC_LAMBDA_SUPPORT) \
1052 /*end*/
1053
1054 #define IGNORE_REQ(req_expr) /* req_expr */
1055 #define ONE_PLUS(scope,value) 1+
1056 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1057 #define VALUE_COMMA(scope,value) scope::value,
1058 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1059 #define STRING_NULL(scope,value) #value "\0"
1060 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1061
1062 static bool advertise_con_value(int which) {
1063 if (which < 0) return false;
1064 bool ok = true;
1065 int count = 0;
1066 #define INC_COUNT(scope,value) \
1067 ++count;
1068 #define CHECK_REQ(req_expr) \
1069 if (which < count) return ok; \
1070 ok = (req_expr);
1071 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1072 #undef INC_COUNT
1073 #undef CHECK_REQ
1074 assert(count == con_value_count, "");
1075 if (which < count) return ok;
1076 return false;
1077 }
1078
1079 #undef ONE_PLUS
1080 #undef VALUE_COMMA
1081 #undef STRING_NULL
1082 #undef EACH_NAMED_CON
1083 #endif // PRODUCT
1084
1085 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1086 #ifndef PRODUCT
1087 if (advertise_con_value(which)) {
1088 assert(which >= 0 && which < con_value_count, "");
1089 int con = con_values[which];
1090 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1091 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1092 const char* str = &con_names[0];
1093 for (int i = 0; i < which; i++)
1094 str += strlen(str) + 1; // skip name and null
1095 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1096 box->obj_at_put(0, name);
1097 }
1098 return con;
1099 }
1100 #endif
1101 return 0;
1102 }
1103 JVM_END
1104
1105 // void init(MemberName self, AccessibleObject ref)
1106 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1107 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1108 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1109 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1110 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1111 MethodHandles::init_MemberName(mname, target);
1112 }
1113 JVM_END
1114
1115 // void expand(MemberName self)
1116 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1117 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1118 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1119 MethodHandles::expand_MemberName(mname, 0, CHECK);
1120 }
1121 JVM_END
1122
1123 // void resolve(MemberName self, Class<?> caller)
1124 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1125 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1126 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1127
1128 // The trusted Java code that calls this method should already have performed
1129 // access checks on behalf of the given caller. But, we can verify this.
1130 if (VerifyMethodHandles && caller_jh != NULL &&
1131 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1132 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1133 if (reference_klass != NULL) {
1134 // Emulate LinkResolver::check_klass_accessability.
1135 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1136 if (!Reflection::verify_class_access(caller,
1137 reference_klass,
1138 true)) {
1139 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1140 }
1141 }
1142 }
1143
1144 Handle resolved = MethodHandles::resolve_MemberName(mname, CHECK_NULL);
1145 if (resolved.is_null()) {
1146 int flags = java_lang_invoke_MemberName::flags(mname());
1147 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1148 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1149 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1150 }
1151 if ((flags & ALL_KINDS) == IS_FIELD) {
1152 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1153 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1154 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1155 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1156 } else {
1157 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1158 }
1159 }
1160
1161 return JNIHandles::make_local(THREAD, resolved());
1162 }
1163 JVM_END
1164
1165 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1166 if (mname == NULL ||
1167 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1168 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1169 } else {
1170 int flags = java_lang_invoke_MemberName::flags(mname);
1171 if ((flags & IS_FIELD) != 0 &&
1172 (must_be_static
1173 ? (flags & JVM_ACC_STATIC) != 0
1174 : (flags & JVM_ACC_STATIC) == 0)) {
1175 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1176 return (jlong) vmindex;
1177 }
1178 }
1179 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1180 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1181 return 0;
1182 }
1183
1184 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1185 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1186 }
1187 JVM_END
1188
1189 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1190 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1191 }
1192 JVM_END
1193
1194 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1195 // use the other function to perform sanity checks:
1196 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1197 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1198 return JNIHandles::make_local(THREAD, clazz);
1199 }
1200 JVM_END
1201
1202 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1203 if (mname_jh == NULL) return NULL;
1204 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1205 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1206 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1207 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1208 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1209 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1210 result->obj_at_put(0, x);
1211 x = NULL;
1212 if (vmtarget == NULL) {
1213 x = NULL;
1214 } else if (vmtarget->is_klass()) {
1215 x = ((Klass*) vmtarget)->java_mirror();
1216 } else if (vmtarget->is_method()) {
1217 Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL);
1218 x = MethodHandles::init_method_MemberName(mname2, (Method*)vmtarget, false, NULL);
1219 }
1220 result->obj_at_put(1, x);
1221 return JNIHandles::make_local(env, result());
1222 }
1223 JVM_END
1224
1225
1226
1227 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1228 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1229 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1230 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1231 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1232 if (clazz_jh == NULL || results_jh == NULL) return -1;
1233 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1234
1235 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1236 if (results.is_null() || !results->is_objArray()) return -1;
1237
1238 TempNewSymbol name = NULL;
1239 TempNewSymbol sig = NULL;
1240 if (name_jh != NULL) {
1241 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1242 if (name == NULL) return 0; // a match is not possible
1243 }
1244 if (sig_jh != NULL) {
1245 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1246 if (sig == NULL) return 0; // a match is not possible
1247 }
1248
1249 KlassHandle caller;
1250 if (caller_jh != NULL) {
1251 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1252 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1253 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1254 }
1255
1256 if (name != NULL && sig != NULL && results.not_null()) {
1257 // try a direct resolve
1258 // %%% TO DO
1259 }
1260
1261 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1262 caller, skip, results);
1263 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1264 return res;
1265 }
1266 JVM_END
1267
1268 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1269 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1270 Handle target (THREAD, JNIHandles::resolve(target_jh));
1271 {
1272 // Walk all nmethods depending on this call site.
1273 MutexLocker mu(Compile_lock, thread);
1274 Universe::flush_dependents_on(call_site, target);
1275 java_lang_invoke_CallSite::set_target(call_site(), target());
1276 }
1277 }
1278 JVM_END
1279
1280 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1281 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1282 Handle target (THREAD, JNIHandles::resolve(target_jh));
1283 {
1284 // Walk all nmethods depending on this call site.
1285 MutexLocker mu(Compile_lock, thread);
1286 Universe::flush_dependents_on(call_site, target);
1287 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1288 }
1289 }
1290 JVM_END
1291
1292 /// JVM_RegisterMethodHandleMethods
1293
1294 #undef CS // Solaris builds complain
1295
1296 #define LANG "Ljava/lang/"
1297 #define JLINV "Ljava/lang/invoke/"
1298
1299 #define OBJ LANG"Object;"
1300 #define CLS LANG"Class;"
1301 #define STRG LANG"String;"
1302 #define CS JLINV"CallSite;"
1303 #define MT JLINV"MethodType;"
1304 #define MH JLINV"MethodHandle;"
1305 #define MEM JLINV"MemberName;"
1306
1307 #define CC (char*) /*cast a literal from (const char*)*/
1308 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1309
1310 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1311 static JNINativeMethod required_methods_JDK8[] = {
1312 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1313 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1314 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1315 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1316 // static native int getNamedCon(int which, Object[] name)
1317 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1318 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1319 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1320 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1321 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1322 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1323 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1324 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1325 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1326 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1327 };
1328
1329 // This one function is exported, used by NativeLookup.
1330
1331 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1332 if (!EnableInvokeDynamic) {
1333 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
1334 return; // bind nothing
1335 }
1336
1337 assert(!MethodHandles::enabled(), "must not be enabled");
1338 bool enable_MH = true;
1339
1340 jclass MH_class = NULL;
1341 if (SystemDictionary::MethodHandle_klass() == NULL) {
1342 enable_MH = false;
1343 } else {
1344 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1345 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1346 }
1347
1348 int status;
1349
1350 if (enable_MH) {
1351 ThreadToNativeFromVM ttnfv(thread);
1352
1353 status = env->RegisterNatives(MHN_class, required_methods_JDK8, sizeof(required_methods_JDK8)/sizeof(JNINativeMethod));
1354 if (status != JNI_OK || env->ExceptionOccurred()) {
1355 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1356 enable_MH = false;
1357 env->ExceptionClear();
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