Tue, 23 Apr 2013 08:12:14 -0700
8012961: Do not restrict static interface methods to be private
Summary: Lambda changes; spec 0.6.2 - remove the restriction that was added as part of recent changes made to support upcoming changes to compilation of lambda methods.
Reviewed-by: dholmes, acorn
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 */
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"
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 */
55 bool MethodHandles::_enabled = false; // set true after successful native linkage
56 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
58 //------------------------------------------------------------------------------
59 // MethodHandles::generate_adapters
60 //
61 void MethodHandles::generate_adapters() {
62 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
64 assert(_adapter_code == NULL, "generate only once");
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 }
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 }
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 }
105 // MemberName support
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 };
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 }
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 }
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 // Get vindex from itable if method holder is an interface.
196 if (m->method_holder()->is_interface()) {
197 vmindex = klassItable::compute_itable_index(m);
198 }
199 } else if (receiver_limit != mklass &&
200 !receiver_limit->is_subtype_of(mklass)) {
201 return NULL; // bad receiver limit
202 } else if (receiver_limit->is_interface() &&
203 mklass->is_interface()) {
204 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
205 receiver_limit = mklass; // ignore passed-in limit; interfaces are interconvertible
206 vmindex = klassItable::compute_itable_index(m);
207 } else if (mklass != receiver_limit && mklass->is_interface()) {
208 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
209 // it is a miranda method, so m->vtable_index is not what we want
210 ResourceMark rm;
211 klassVtable* vt = InstanceKlass::cast(receiver_limit)->vtable();
212 vmindex = vt->index_of_miranda(m->name(), m->signature());
213 } else if (!do_dispatch || m->can_be_statically_bound()) {
214 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
215 } else {
216 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
217 vmindex = m->vtable_index();
218 }
220 // @CallerSensitive annotation detected
221 if (m->caller_sensitive()) {
222 flags |= CALLER_SENSITIVE;
223 }
225 oop mname_oop = mname();
226 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
227 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m);
228 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
229 java_lang_invoke_MemberName::set_clazz( mname_oop, receiver_limit->java_mirror());
230 // Note: name and type can be lazily computed by resolve_MemberName,
231 // if Java code needs them as resolved String and MethodType objects.
232 // The clazz must be eagerly stored, because it provides a GC
233 // root to help keep alive the Method*.
234 // If relevant, the vtable or itable value is stored as vmindex.
235 // This is done eagerly, since it is readily available without
236 // constructing any new objects.
237 // TO DO: maybe intern mname_oop
238 m->method_holder()->add_member_name(mname);
239 return mname();
240 }
242 Handle MethodHandles::init_method_MemberName(Handle mname, CallInfo& info, TRAPS) {
243 Handle empty;
244 if (info.resolved_appendix().not_null()) {
245 // The resolved MemberName must not be accompanied by an appendix argument,
246 // since there is no way to bind this value into the MemberName.
247 // Caller is responsible to prevent this from happening.
248 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
249 }
250 methodHandle m = info.resolved_method();
251 KlassHandle defc = info.resolved_klass();
252 int vmindex = -1;
253 if (defc->is_interface() && m->method_holder()->is_interface()) {
254 // LinkResolver does not report itable indexes! (fix this?)
255 vmindex = klassItable::compute_itable_index(m());
256 } else if (m->can_be_statically_bound()) {
257 // LinkResolver reports vtable index even for final methods!
258 vmindex = Method::nonvirtual_vtable_index;
259 } else {
260 vmindex = info.vtable_index();
261 }
262 oop res = init_method_MemberName(mname, m(), (vmindex >= 0), defc());
263 assert(res == NULL || (java_lang_invoke_MemberName::vmindex(res) == vmindex), "");
264 return Handle(THREAD, res);
265 }
267 oop MethodHandles::init_field_MemberName(Handle mname, KlassHandle field_holder,
268 AccessFlags mods, oop type, oop name,
269 intptr_t offset, bool is_setter) {
270 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
271 flags |= IS_FIELD | ((mods.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
272 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
273 Metadata* vmtarget = field_holder();
274 int vmindex = offset; // determines the field uniquely when combined with static bit
275 oop mname_oop = mname();
276 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
277 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
278 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
279 java_lang_invoke_MemberName::set_clazz(mname_oop, field_holder->java_mirror());
280 if (name != NULL)
281 java_lang_invoke_MemberName::set_name(mname_oop, name);
282 if (type != NULL)
283 java_lang_invoke_MemberName::set_type(mname_oop, type);
284 // Note: name and type can be lazily computed by resolve_MemberName,
285 // if Java code needs them as resolved String and Class objects.
286 // Note that the incoming type oop might be pre-resolved (non-null).
287 // The base clazz and field offset (vmindex) must be eagerly stored,
288 // because they unambiguously identify the field.
289 // Although the fieldDescriptor::_index would also identify the field,
290 // we do not use it, because it is harder to decode.
291 // TO DO: maybe intern mname_oop
292 InstanceKlass::cast(field_holder())->add_member_name(mname);
293 return mname();
294 }
296 Handle MethodHandles::init_field_MemberName(Handle mname, FieldAccessInfo& info, TRAPS) {
297 return Handle();
298 #if 0 // FIXME
299 KlassHandle field_holder = info.klass();
300 intptr_t field_offset = info.field_offset();
301 return init_field_MemberName(mname_oop, field_holder(),
302 info.access_flags(),
303 type, name,
304 field_offset, false /*is_setter*/);
305 #endif
306 }
309 // JVM 2.9 Special Methods:
310 // A method is signature polymorphic if and only if all of the following conditions hold :
311 // * It is declared in the java.lang.invoke.MethodHandle class.
312 // * It has a single formal parameter of type Object[].
313 // * It has a return type of Object.
314 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
315 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
316 if (klass == NULL)
317 return false;
318 // The following test will fail spuriously during bootstrap of MethodHandle itself:
319 // if (klass != SystemDictionary::MethodHandle_klass())
320 // Test the name instead:
321 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
322 return false;
323 Symbol* poly_sig = vmSymbols::object_array_object_signature();
324 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
325 if (m == NULL) return false;
326 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
327 int flags = m->access_flags().as_int();
328 return (flags & required) == required;
329 }
332 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
333 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
334 switch (iid) {
335 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
336 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
337 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
338 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
339 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
340 }
341 assert(false, "");
342 return 0;
343 }
345 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
346 switch (iid) {
347 case vmIntrinsics::_invokeBasic: return 0;
348 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
349 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
350 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
351 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
352 }
353 assert(false, err_msg("iid=%d", iid));
354 return 0;
355 }
357 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
358 vmSymbols::SID name_id = vmSymbols::find_sid(name);
359 switch (name_id) {
360 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
361 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
362 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
363 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
365 // There is one static signature-polymorphic method for each JVM invocation mode.
366 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
367 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
368 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
369 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
370 }
372 // Cover the case of invokeExact and any future variants of invokeFoo.
373 Klass* mh_klass = SystemDictionary::well_known_klass(
374 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
375 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
376 return vmIntrinsics::_invokeGeneric;
378 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
379 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
380 return vmIntrinsics::_none;
381 }
383 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
384 if (klass != NULL &&
385 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
386 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
387 if (iid != vmIntrinsics::_none)
388 return iid;
389 if (is_method_handle_invoke_name(klass, name))
390 return vmIntrinsics::_invokeGeneric;
391 }
392 return vmIntrinsics::_none;
393 }
396 // convert the external string or reflective type to an internal signature
397 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
398 if (java_lang_invoke_MethodType::is_instance(type_str)) {
399 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
400 } else if (java_lang_Class::is_instance(type_str)) {
401 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
402 } else if (java_lang_String::is_instance(type_str)) {
403 if (intern_if_not_found) {
404 return java_lang_String::as_symbol(type_str, CHECK_NULL);
405 } else {
406 return java_lang_String::as_symbol_or_null(type_str);
407 }
408 } else {
409 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
410 }
411 }
413 static const char OBJ_SIG[] = "Ljava/lang/Object;";
414 enum { OBJ_SIG_LEN = 18 };
416 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
417 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
418 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
419 const int len = sig->utf8_length();
420 for (int i = 0; i < len; i++) {
421 switch (sig->byte_at(i)) {
422 case 'L':
423 // only java/lang/Object is valid here
424 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
425 return false;
426 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
427 continue;
428 case '(': case ')': case 'V':
429 case 'I': case 'J': case 'F': case 'D':
430 continue;
431 //case '[':
432 //case 'Z': case 'B': case 'C': case 'S':
433 default:
434 return false;
435 }
436 }
437 return true;
438 }
440 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
441 Symbol* bsig = NULL;
442 if (sig == NULL) {
443 return sig;
444 } else if (is_basic_type_signature(sig)) {
445 sig->increment_refcount();
446 return sig; // that was easy
447 } else if (sig->byte_at(0) != '(') {
448 BasicType bt = char2type(sig->byte_at(0));
449 if (is_subword_type(bt)) {
450 bsig = vmSymbols::int_signature();
451 } else {
452 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
453 bsig = vmSymbols::object_signature();
454 }
455 } else {
456 ResourceMark rm;
457 stringStream buffer(128);
458 buffer.put('(');
459 int arg_pos = 0, keep_arg_pos = -1;
460 if (keep_last_arg)
461 keep_arg_pos = ArgumentCount(sig).size() - 1;
462 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
463 BasicType bt = ss.type();
464 size_t this_arg_pos = buffer.size();
465 if (ss.at_return_type()) {
466 buffer.put(')');
467 }
468 if (arg_pos == keep_arg_pos) {
469 buffer.write((char*) ss.raw_bytes(),
470 (int) ss.raw_length());
471 } else if (bt == T_OBJECT || bt == T_ARRAY) {
472 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
473 } else {
474 if (is_subword_type(bt))
475 bt = T_INT;
476 buffer.put(type2char(bt));
477 }
478 arg_pos++;
479 }
480 const char* sigstr = buffer.base();
481 int siglen = (int) buffer.size();
482 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
483 }
484 assert(is_basic_type_signature(bsig) ||
485 // detune assert in case the injected argument is not a basic type:
486 keep_last_arg, "");
487 return bsig;
488 }
490 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
491 Symbol* sig,
492 bool keep_arrays,
493 bool keep_basic_names) {
494 st = st ? st : tty;
495 int len = sig->utf8_length();
496 int array = 0;
497 bool prev_type = false;
498 for (int i = 0; i < len; i++) {
499 char ch = sig->byte_at(i);
500 switch (ch) {
501 case '(': case ')':
502 prev_type = false;
503 st->put(ch);
504 continue;
505 case '[':
506 if (!keep_basic_names && keep_arrays)
507 st->put(ch);
508 array++;
509 continue;
510 case 'L':
511 {
512 if (prev_type) st->put(',');
513 int start = i+1, slash = start;
514 while (++i < len && (ch = sig->byte_at(i)) != ';') {
515 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
516 }
517 if (slash < i) start = slash;
518 if (!keep_basic_names) {
519 st->put('L');
520 } else {
521 for (int j = start; j < i; j++)
522 st->put(sig->byte_at(j));
523 prev_type = true;
524 }
525 break;
526 }
527 default:
528 {
529 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
530 ch = '[';
531 array = 0;
532 }
533 if (prev_type) st->put(',');
534 const char* n = NULL;
535 if (keep_basic_names)
536 n = type2name(char2type(ch));
537 if (n == NULL) {
538 // unknown letter, or we don't want to know its name
539 st->put(ch);
540 } else {
541 st->print(n);
542 prev_type = true;
543 }
544 break;
545 }
546 }
547 // Switch break goes here to take care of array suffix:
548 if (prev_type) {
549 while (array > 0) {
550 st->print("[]");
551 --array;
552 }
553 }
554 array = 0;
555 }
556 }
560 static oop object_java_mirror() {
561 return SystemDictionary::Object_klass()->java_mirror();
562 }
564 static oop field_name_or_null(Symbol* s) {
565 if (s == NULL) return NULL;
566 return StringTable::lookup(s);
567 }
569 static oop field_signature_type_or_null(Symbol* s) {
570 if (s == NULL) return NULL;
571 BasicType bt = FieldType::basic_type(s);
572 if (is_java_primitive(bt)) {
573 assert(s->utf8_length() == 1, "");
574 return java_lang_Class::primitive_mirror(bt);
575 }
576 // Here are some more short cuts for common types.
577 // They are optional, since reference types can be resolved lazily.
578 if (bt == T_OBJECT) {
579 if (s == vmSymbols::object_signature()) {
580 return object_java_mirror();
581 } else if (s == vmSymbols::class_signature()) {
582 return SystemDictionary::Class_klass()->java_mirror();
583 } else if (s == vmSymbols::string_signature()) {
584 return SystemDictionary::String_klass()->java_mirror();
585 }
586 }
587 return NULL;
588 }
591 // An unresolved member name is a mere symbolic reference.
592 // Resolving it plants a vmtarget/vmindex in it,
593 // which refers directly to JVM internals.
594 Handle MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
595 Handle empty;
596 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
598 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
599 // Already resolved.
600 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
601 assert(vmindex >= Method::nonvirtual_vtable_index, "");
602 return mname;
603 }
605 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
606 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
607 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
608 int flags = java_lang_invoke_MemberName::flags(mname());
609 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
610 if (!ref_kind_is_valid(ref_kind)) {
611 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
612 }
614 DEBUG_ONLY(int old_vmindex);
615 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
617 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
618 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
619 }
621 instanceKlassHandle defc;
622 {
623 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
624 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
625 if (!defc_klass->oop_is_instance()) {
626 if (!defc_klass->oop_is_array()) return empty;
627 defc_klass = SystemDictionary::Object_klass();
628 }
629 defc = instanceKlassHandle(THREAD, defc_klass);
630 }
631 if (defc.is_null()) {
632 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
633 }
634 defc->link_class(CHECK_(empty)); // possible safepoint
636 // convert the external string name to an internal symbol
637 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
638 if (name == NULL) return empty; // no such name
639 if (name == vmSymbols::class_initializer_name())
640 return empty; // illegal name
642 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
643 if ((flags & ALL_KINDS) == IS_METHOD &&
644 (defc() == SystemDictionary::MethodHandle_klass()) &&
645 (ref_kind == JVM_REF_invokeVirtual ||
646 ref_kind == JVM_REF_invokeSpecial ||
647 // static invocation mode is required for _linkToVirtual, etc.:
648 ref_kind == JVM_REF_invokeStatic)) {
649 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
650 if (iid != vmIntrinsics::_none &&
651 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
652 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
653 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
654 mh_invoke_id = iid;
655 }
656 }
658 // convert the external string or reflective type to an internal signature
659 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
660 if (type == NULL) return empty; // no such signature exists in the VM
662 // Time to do the lookup.
663 switch (flags & ALL_KINDS) {
664 case IS_METHOD:
665 {
666 CallInfo result;
667 bool do_dispatch = true; // default, neutral setting
668 {
669 assert(!HAS_PENDING_EXCEPTION, "");
670 if (ref_kind == JVM_REF_invokeStatic) {
671 //do_dispatch = false; // no need, since statics are never dispatched
672 LinkResolver::resolve_static_call(result,
673 defc, name, type, KlassHandle(), false, false, THREAD);
674 } else if (ref_kind == JVM_REF_invokeInterface) {
675 LinkResolver::resolve_interface_call(result, Handle(), defc,
676 defc, name, type, KlassHandle(), false, false, THREAD);
677 } else if (mh_invoke_id != vmIntrinsics::_none) {
678 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
679 LinkResolver::resolve_handle_call(result,
680 defc, name, type, KlassHandle(), THREAD);
681 } else if (ref_kind == JVM_REF_invokeSpecial) {
682 do_dispatch = false; // force non-virtual linkage
683 LinkResolver::resolve_special_call(result,
684 defc, name, type, KlassHandle(), false, THREAD);
685 } else if (ref_kind == JVM_REF_invokeVirtual) {
686 LinkResolver::resolve_virtual_call(result, Handle(), defc,
687 defc, name, type, KlassHandle(), false, false, THREAD);
688 } else {
689 assert(false, err_msg("ref_kind=%d", ref_kind));
690 }
691 if (HAS_PENDING_EXCEPTION) {
692 return empty;
693 }
694 }
695 return init_method_MemberName(mname, result, THREAD);
696 }
697 case IS_CONSTRUCTOR:
698 {
699 CallInfo result;
700 {
701 assert(!HAS_PENDING_EXCEPTION, "");
702 if (name == vmSymbols::object_initializer_name()) {
703 LinkResolver::resolve_special_call(result,
704 defc, name, type, KlassHandle(), false, THREAD);
705 } else {
706 break; // will throw after end of switch
707 }
708 if (HAS_PENDING_EXCEPTION) {
709 return empty;
710 }
711 }
712 assert(result.is_statically_bound(), "");
713 return init_method_MemberName(mname, result, THREAD);
714 }
715 case IS_FIELD:
716 {
717 // This is taken from LinkResolver::resolve_field, sans access checks.
718 fieldDescriptor fd; // find_field initializes fd if found
719 KlassHandle sel_klass(THREAD, InstanceKlass::cast(defc())->find_field(name, type, &fd));
720 // check if field exists; i.e., if a klass containing the field def has been selected
721 if (sel_klass.is_null()) return empty; // should not happen
722 oop type = field_signature_type_or_null(fd.signature());
723 oop name = field_name_or_null(fd.name());
724 bool is_setter = (ref_kind_is_valid(ref_kind) && ref_kind_is_setter(ref_kind));
725 mname = Handle(THREAD,
726 init_field_MemberName(mname, sel_klass,
727 fd.access_flags(), type, name, fd.offset(), is_setter));
728 return mname;
729 }
730 default:
731 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
732 }
734 return empty;
735 }
737 // Conversely, a member name which is only initialized from JVM internals
738 // may have null defc, name, and type fields.
739 // Resolving it plants a vmtarget/vmindex in it,
740 // which refers directly to JVM internals.
741 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
742 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
743 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
744 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
745 if (vmtarget == NULL) {
746 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
747 }
749 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
750 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
751 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
752 int flags = java_lang_invoke_MemberName::flags(mname());
754 if (suppress != 0) {
755 if (suppress & _suppress_defc) have_defc = true;
756 if (suppress & _suppress_name) have_name = true;
757 if (suppress & _suppress_type) have_type = true;
758 }
760 if (have_defc && have_name && have_type) return; // nothing needed
762 switch (flags & ALL_KINDS) {
763 case IS_METHOD:
764 case IS_CONSTRUCTOR:
765 {
766 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
767 methodHandle m(THREAD, (Method*)vmtarget);
768 DEBUG_ONLY(vmtarget = NULL); // safety
769 if (m.is_null()) break;
770 if (!have_defc) {
771 InstanceKlass* defc = m->method_holder();
772 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
773 }
774 if (!have_name) {
775 //not java_lang_String::create_from_symbol; let's intern member names
776 Handle name = StringTable::intern(m->name(), CHECK);
777 java_lang_invoke_MemberName::set_name(mname(), name());
778 }
779 if (!have_type) {
780 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
781 java_lang_invoke_MemberName::set_type(mname(), type());
782 }
783 return;
784 }
785 case IS_FIELD:
786 {
787 // This is taken from LinkResolver::resolve_field, sans access checks.
788 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
789 if (!((Klass*) vmtarget)->oop_is_instance()) break;
790 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
791 DEBUG_ONLY(vmtarget = NULL); // safety
792 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
793 fieldDescriptor fd; // find_field initializes fd if found
794 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
795 break; // cannot expand
796 if (!have_defc) {
797 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
798 }
799 if (!have_name) {
800 //not java_lang_String::create_from_symbol; let's intern member names
801 Handle name = StringTable::intern(fd.name(), CHECK);
802 java_lang_invoke_MemberName::set_name(mname(), name());
803 }
804 if (!have_type) {
805 // If it is a primitive field type, don't mess with short strings like "I".
806 Handle type = field_signature_type_or_null(fd.signature());
807 if (type.is_null()) {
808 java_lang_String::create_from_symbol(fd.signature(), CHECK);
809 }
810 java_lang_invoke_MemberName::set_type(mname(), type());
811 }
812 return;
813 }
814 }
815 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
816 }
818 int MethodHandles::find_MemberNames(KlassHandle k,
819 Symbol* name, Symbol* sig,
820 int mflags, KlassHandle caller,
821 int skip, objArrayHandle results) {
822 // %%% take caller into account!
824 Thread* thread = Thread::current();
826 if (k.is_null() || !k->oop_is_instance()) return -1;
828 int rfill = 0, rlimit = results->length(), rskip = skip;
829 // overflow measurement:
830 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
832 int match_flags = mflags;
833 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
834 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
835 bool local_only = !(search_superc | search_intfc);
836 bool classes_only = false;
838 if (name != NULL) {
839 if (name->utf8_length() == 0) return 0; // a match is not possible
840 }
841 if (sig != NULL) {
842 if (sig->utf8_length() == 0) return 0; // a match is not possible
843 if (sig->byte_at(0) == '(')
844 match_flags &= ~(IS_FIELD | IS_TYPE);
845 else
846 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
847 }
849 if ((match_flags & IS_TYPE) != 0) {
850 // NYI, and Core Reflection works quite well for this query
851 }
853 if ((match_flags & IS_FIELD) != 0) {
854 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
855 if (name != NULL && st.name() != name)
856 continue;
857 if (sig != NULL && st.signature() != sig)
858 continue;
859 // passed the filters
860 if (rskip > 0) {
861 --rskip;
862 } else if (rfill < rlimit) {
863 Handle result(thread, results->obj_at(rfill++));
864 if (!java_lang_invoke_MemberName::is_instance(result()))
865 return -99; // caller bug!
866 oop type = field_signature_type_or_null(st.signature());
867 oop name = field_name_or_null(st.name());
868 oop saved = MethodHandles::init_field_MemberName(result, st.klass(),
869 st.access_flags(), type, name,
870 st.offset());
871 if (saved != result())
872 results->obj_at_put(rfill-1, saved); // show saved instance to user
873 } else if (++overflow >= overflow_limit) {
874 match_flags = 0; break; // got tired of looking at overflow
875 }
876 }
877 }
879 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
880 // watch out for these guys:
881 Symbol* init_name = vmSymbols::object_initializer_name();
882 Symbol* clinit_name = vmSymbols::class_initializer_name();
883 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
884 bool negate_name_test = false;
885 // fix name so that it captures the intention of IS_CONSTRUCTOR
886 if (!(match_flags & IS_METHOD)) {
887 // constructors only
888 if (name == NULL) {
889 name = init_name;
890 } else if (name != init_name) {
891 return 0; // no constructors of this method name
892 }
893 } else if (!(match_flags & IS_CONSTRUCTOR)) {
894 // methods only
895 if (name == NULL) {
896 name = init_name;
897 negate_name_test = true; // if we see the name, we *omit* the entry
898 } else if (name == init_name) {
899 return 0; // no methods of this constructor name
900 }
901 } else {
902 // caller will accept either sort; no need to adjust name
903 }
904 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
905 Method* m = st.method();
906 Symbol* m_name = m->name();
907 if (m_name == clinit_name)
908 continue;
909 if (name != NULL && ((m_name != name) ^ negate_name_test))
910 continue;
911 if (sig != NULL && m->signature() != sig)
912 continue;
913 // passed the filters
914 if (rskip > 0) {
915 --rskip;
916 } else if (rfill < rlimit) {
917 Handle result(thread, results->obj_at(rfill++));
918 if (!java_lang_invoke_MemberName::is_instance(result()))
919 return -99; // caller bug!
920 oop saved = MethodHandles::init_method_MemberName(result, m, true, NULL);
921 if (saved != result())
922 results->obj_at_put(rfill-1, saved); // show saved instance to user
923 } else if (++overflow >= overflow_limit) {
924 match_flags = 0; break; // got tired of looking at overflow
925 }
926 }
927 }
929 // return number of elements we at leasted wanted to initialize
930 return rfill + overflow;
931 }
933 //------------------------------------------------------------------------------
934 // MemberNameTable
935 //
937 MemberNameTable::MemberNameTable() : GrowableArray<jweak>(10, true) {
938 assert_locked_or_safepoint(MemberNameTable_lock);
939 }
941 MemberNameTable::~MemberNameTable() {
942 assert_locked_or_safepoint(MemberNameTable_lock);
943 int len = this->length();
945 for (int idx = 0; idx < len; idx++) {
946 jweak ref = this->at(idx);
947 JNIHandles::destroy_weak_global(ref);
948 }
949 }
951 // Return entry index if found, return -1 otherwise.
952 int MemberNameTable::find_member_name(oop mem_name) {
953 assert_locked_or_safepoint(MemberNameTable_lock);
954 int len = this->length();
956 for (int idx = 0; idx < len; idx++) {
957 jweak ref = this->at(idx);
958 oop entry = JNIHandles::resolve(ref);
959 if (entry == mem_name) {
960 return idx;
961 }
962 }
963 return -1;
964 }
966 void MemberNameTable::add_member_name(jweak mem_name_wref) {
967 assert_locked_or_safepoint(MemberNameTable_lock);
968 oop mem_name = JNIHandles::resolve(mem_name_wref);
970 // Each member name may appear just once: add only if not found
971 if (find_member_name(mem_name) == -1) {
972 this->append(mem_name_wref);
973 }
974 }
976 #if INCLUDE_JVMTI
977 oop MemberNameTable::find_member_name_by_method(Method* old_method) {
978 assert_locked_or_safepoint(MemberNameTable_lock);
979 oop found = NULL;
980 int len = this->length();
982 for (int idx = 0; idx < len; idx++) {
983 oop mem_name = JNIHandles::resolve(this->at(idx));
984 if (mem_name == NULL) {
985 continue;
986 }
987 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
988 if (method == old_method) {
989 found = mem_name;
990 break;
991 }
992 }
993 return found;
994 }
996 // It is called at safepoint only
997 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
998 int methods_length, bool *trace_name_printed) {
999 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
1000 // search the MemberNameTable for uses of either obsolete or EMCP methods
1001 for (int j = 0; j < methods_length; j++) {
1002 Method* old_method = old_methods[j];
1003 Method* new_method = new_methods[j];
1004 oop mem_name = find_member_name_by_method(old_method);
1005 if (mem_name != NULL) {
1006 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method);
1008 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1009 if (!(*trace_name_printed)) {
1010 // RC_TRACE_MESG macro has an embedded ResourceMark
1011 RC_TRACE_MESG(("adjust: name=%s",
1012 old_method->method_holder()->external_name()));
1013 *trace_name_printed = true;
1014 }
1015 // RC_TRACE macro has an embedded ResourceMark
1016 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
1017 new_method->name()->as_C_string(),
1018 new_method->signature()->as_C_string()));
1019 }
1020 }
1021 }
1022 }
1023 #endif // INCLUDE_JVMTI
1025 //
1026 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1027 // They are the private interface between this JVM and the HotSpot-specific
1028 // Java code that implements JSR 292 method handles.
1029 //
1030 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1031 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1032 //
1034 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
1035 switch (which) {
1036 case MethodHandles::GC_COUNT_GWT:
1037 #ifdef COMPILER2
1038 return true;
1039 #else
1040 return false;
1041 #endif
1042 }
1043 return 0;
1044 }
1045 JVM_END
1047 #ifndef PRODUCT
1048 #define EACH_NAMED_CON(template, requirement) \
1049 template(MethodHandles,GC_COUNT_GWT) \
1050 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1051 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1052 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1053 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1054 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1055 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1056 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1057 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1058 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1059 template(MethodHandles,GC_LAMBDA_SUPPORT) \
1060 /*end*/
1062 #define IGNORE_REQ(req_expr) /* req_expr */
1063 #define ONE_PLUS(scope,value) 1+
1064 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1065 #define VALUE_COMMA(scope,value) scope::value,
1066 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1067 #define STRING_NULL(scope,value) #value "\0"
1068 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1070 static bool advertise_con_value(int which) {
1071 if (which < 0) return false;
1072 bool ok = true;
1073 int count = 0;
1074 #define INC_COUNT(scope,value) \
1075 ++count;
1076 #define CHECK_REQ(req_expr) \
1077 if (which < count) return ok; \
1078 ok = (req_expr);
1079 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1080 #undef INC_COUNT
1081 #undef CHECK_REQ
1082 assert(count == con_value_count, "");
1083 if (which < count) return ok;
1084 return false;
1085 }
1087 #undef ONE_PLUS
1088 #undef VALUE_COMMA
1089 #undef STRING_NULL
1090 #undef EACH_NAMED_CON
1091 #endif // PRODUCT
1093 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1094 #ifndef PRODUCT
1095 if (advertise_con_value(which)) {
1096 assert(which >= 0 && which < con_value_count, "");
1097 int con = con_values[which];
1098 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1099 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1100 const char* str = &con_names[0];
1101 for (int i = 0; i < which; i++)
1102 str += strlen(str) + 1; // skip name and null
1103 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1104 box->obj_at_put(0, name);
1105 }
1106 return con;
1107 }
1108 #endif
1109 return 0;
1110 }
1111 JVM_END
1113 // void init(MemberName self, AccessibleObject ref)
1114 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1115 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1116 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1117 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1118 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1119 MethodHandles::init_MemberName(mname, target);
1120 }
1121 JVM_END
1123 // void expand(MemberName self)
1124 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1125 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1126 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1127 MethodHandles::expand_MemberName(mname, 0, CHECK);
1128 }
1129 JVM_END
1131 // void resolve(MemberName self, Class<?> caller)
1132 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1133 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1134 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1136 // The trusted Java code that calls this method should already have performed
1137 // access checks on behalf of the given caller. But, we can verify this.
1138 if (VerifyMethodHandles && caller_jh != NULL &&
1139 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1140 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1141 if (reference_klass != NULL) {
1142 // Emulate LinkResolver::check_klass_accessability.
1143 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1144 if (!Reflection::verify_class_access(caller,
1145 reference_klass,
1146 true)) {
1147 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1148 }
1149 }
1150 }
1152 Handle resolved = MethodHandles::resolve_MemberName(mname, CHECK_NULL);
1153 if (resolved.is_null()) {
1154 int flags = java_lang_invoke_MemberName::flags(mname());
1155 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1156 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1157 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1158 }
1159 if ((flags & ALL_KINDS) == IS_FIELD) {
1160 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1161 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1162 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1163 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1164 } else {
1165 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1166 }
1167 }
1169 return JNIHandles::make_local(THREAD, resolved());
1170 }
1171 JVM_END
1173 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1174 if (mname == NULL ||
1175 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1176 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1177 } else {
1178 int flags = java_lang_invoke_MemberName::flags(mname);
1179 if ((flags & IS_FIELD) != 0 &&
1180 (must_be_static
1181 ? (flags & JVM_ACC_STATIC) != 0
1182 : (flags & JVM_ACC_STATIC) == 0)) {
1183 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1184 return (jlong) vmindex;
1185 }
1186 }
1187 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1188 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1189 return 0;
1190 }
1192 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1193 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1194 }
1195 JVM_END
1197 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1198 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1199 }
1200 JVM_END
1202 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1203 // use the other function to perform sanity checks:
1204 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1205 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1206 return JNIHandles::make_local(THREAD, clazz);
1207 }
1208 JVM_END
1210 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1211 if (mname_jh == NULL) return NULL;
1212 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1213 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1214 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1215 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1216 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1217 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1218 result->obj_at_put(0, x);
1219 x = NULL;
1220 if (vmtarget == NULL) {
1221 x = NULL;
1222 } else if (vmtarget->is_klass()) {
1223 x = ((Klass*) vmtarget)->java_mirror();
1224 } else if (vmtarget->is_method()) {
1225 Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL);
1226 x = MethodHandles::init_method_MemberName(mname2, (Method*)vmtarget, false, NULL);
1227 }
1228 result->obj_at_put(1, x);
1229 return JNIHandles::make_local(env, result());
1230 }
1231 JVM_END
1235 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1236 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1237 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1238 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1239 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1240 if (clazz_jh == NULL || results_jh == NULL) return -1;
1241 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1243 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1244 if (results.is_null() || !results->is_objArray()) return -1;
1246 TempNewSymbol name = NULL;
1247 TempNewSymbol sig = NULL;
1248 if (name_jh != NULL) {
1249 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1250 if (name == NULL) return 0; // a match is not possible
1251 }
1252 if (sig_jh != NULL) {
1253 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1254 if (sig == NULL) return 0; // a match is not possible
1255 }
1257 KlassHandle caller;
1258 if (caller_jh != NULL) {
1259 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1260 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1261 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1262 }
1264 if (name != NULL && sig != NULL && results.not_null()) {
1265 // try a direct resolve
1266 // %%% TO DO
1267 }
1269 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1270 caller, skip, results);
1271 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1272 return res;
1273 }
1274 JVM_END
1276 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1277 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1278 Handle target (THREAD, JNIHandles::resolve(target_jh));
1279 {
1280 // Walk all nmethods depending on this call site.
1281 MutexLocker mu(Compile_lock, thread);
1282 Universe::flush_dependents_on(call_site, target);
1283 java_lang_invoke_CallSite::set_target(call_site(), target());
1284 }
1285 }
1286 JVM_END
1288 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1289 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1290 Handle target (THREAD, JNIHandles::resolve(target_jh));
1291 {
1292 // Walk all nmethods depending on this call site.
1293 MutexLocker mu(Compile_lock, thread);
1294 Universe::flush_dependents_on(call_site, target);
1295 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1296 }
1297 }
1298 JVM_END
1300 /// JVM_RegisterMethodHandleMethods
1302 #undef CS // Solaris builds complain
1304 #define LANG "Ljava/lang/"
1305 #define JLINV "Ljava/lang/invoke/"
1307 #define OBJ LANG"Object;"
1308 #define CLS LANG"Class;"
1309 #define STRG LANG"String;"
1310 #define CS JLINV"CallSite;"
1311 #define MT JLINV"MethodType;"
1312 #define MH JLINV"MethodHandle;"
1313 #define MEM JLINV"MemberName;"
1315 #define CC (char*) /*cast a literal from (const char*)*/
1316 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1318 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1319 static JNINativeMethod required_methods_JDK8[] = {
1320 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1321 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1322 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1323 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1324 // static native int getNamedCon(int which, Object[] name)
1325 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1326 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1327 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1328 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1329 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1330 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1331 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1332 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1333 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1334 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1335 };
1337 // This one function is exported, used by NativeLookup.
1339 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1340 if (!EnableInvokeDynamic) {
1341 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
1342 return; // bind nothing
1343 }
1345 assert(!MethodHandles::enabled(), "must not be enabled");
1346 bool enable_MH = true;
1348 jclass MH_class = NULL;
1349 if (SystemDictionary::MethodHandle_klass() == NULL) {
1350 enable_MH = false;
1351 } else {
1352 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1353 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1354 }
1356 int status;
1358 if (enable_MH) {
1359 ThreadToNativeFromVM ttnfv(thread);
1361 status = env->RegisterNatives(MHN_class, required_methods_JDK8, sizeof(required_methods_JDK8)/sizeof(JNINativeMethod));
1362 if (status != JNI_OK || env->ExceptionOccurred()) {
1363 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1364 enable_MH = false;
1365 env->ExceptionClear();
1366 }
1367 }
1369 if (TraceInvokeDynamic) {
1370 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1371 }
1373 if (enable_MH) {
1374 MethodHandles::generate_adapters();
1375 MethodHandles::set_enabled(true);
1376 }
1377 }
1378 JVM_END