Tue, 14 Jan 2014 12:44:12 +0100
8030662: "assert(counter_changed) failed: failed dependencies, but counter didn't change" still fails
Summary: Erroneously removed call to SystemDictionary::notice_modification() from jvmti with fix for 8029383
Reviewed-by: iveresov, twisti, kvn
1 /*
2 * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
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, OOM_MALLOC_ERROR,
71 "CodeCache: no room for MethodHandles adapters");
72 {
73 CodeBuffer code(_adapter_code);
74 MethodHandlesAdapterGenerator g(&code);
75 g.generate();
76 code.log_section_sizes("MethodHandlesAdapterBlob");
77 }
78 }
80 //------------------------------------------------------------------------------
81 // MethodHandlesAdapterGenerator::generate
82 //
83 void MethodHandlesAdapterGenerator::generate() {
84 // Generate generic method handle adapters.
85 // Generate interpreter entries
86 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
87 mk <= Interpreter::method_handle_invoke_LAST;
88 mk = Interpreter::MethodKind(1 + (int)mk)) {
89 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
90 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
91 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
92 if (entry != NULL) {
93 Interpreter::set_entry_for_kind(mk, entry);
94 }
95 // If the entry is not set, it will throw AbstractMethodError.
96 }
97 }
99 void MethodHandles::set_enabled(bool z) {
100 if (_enabled != z) {
101 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
102 _enabled = z;
103 }
104 }
106 // MemberName support
108 // import java_lang_invoke_MemberName.*
109 enum {
110 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
111 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
112 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
113 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
114 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
115 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
116 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
117 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
118 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
119 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
120 };
122 Handle MethodHandles::new_MemberName(TRAPS) {
123 Handle empty;
124 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
125 if (!k->is_initialized()) k->initialize(CHECK_(empty));
126 return Handle(THREAD, k->allocate_instance(THREAD));
127 }
129 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
130 // This method is used from java.lang.invoke.MemberName constructors.
131 // It fills in the new MemberName from a java.lang.reflect.Member.
132 Thread* thread = Thread::current();
133 oop target_oop = target();
134 Klass* target_klass = target_oop->klass();
135 if (target_klass == SystemDictionary::reflect_Field_klass()) {
136 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
137 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
138 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
139 if (!k.is_null() && k->oop_is_instance()) {
140 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
141 oop mname2 = init_field_MemberName(mname, fd);
142 if (mname2 != NULL) {
143 // Since we have the reified name and type handy, add them to the result.
144 if (java_lang_invoke_MemberName::name(mname2) == NULL)
145 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
146 if (java_lang_invoke_MemberName::type(mname2) == NULL)
147 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
148 }
149 return mname2;
150 }
151 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
152 oop clazz = java_lang_reflect_Method::clazz(target_oop);
153 int slot = java_lang_reflect_Method::slot(target_oop);
154 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
155 if (!k.is_null() && k->oop_is_instance()) {
156 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
157 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
158 return NULL; // do not resolve unless there is a concrete signature
159 CallInfo info(m, k());
160 return init_method_MemberName(mname, info);
161 }
162 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
163 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
164 int slot = java_lang_reflect_Constructor::slot(target_oop);
165 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
166 if (!k.is_null() && k->oop_is_instance()) {
167 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
168 if (m == NULL) return NULL;
169 CallInfo info(m, k());
170 return init_method_MemberName(mname, info);
171 }
172 }
173 return NULL;
174 }
176 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
177 assert(info.resolved_appendix().is_null(), "only normal methods here");
178 KlassHandle receiver_limit = info.resolved_klass();
179 methodHandle m = info.resolved_method();
180 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
181 int vmindex = Method::invalid_vtable_index;
183 switch (info.call_kind()) {
184 case CallInfo::itable_call:
185 vmindex = info.itable_index();
186 // More importantly, the itable index only works with the method holder.
187 receiver_limit = m->method_holder();
188 assert(receiver_limit->verify_itable_index(vmindex), "");
189 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
190 if (TraceInvokeDynamic) {
191 ResourceMark rm;
192 tty->print_cr("memberName: invokeinterface method_holder::method: %s, receiver: %s, itableindex: %d, access_flags:",
193 Method::name_and_sig_as_C_string(receiver_limit(), m->name(), m->signature()),
194 receiver_limit()->internal_name(), vmindex);
195 m->access_flags().print_on(tty);
196 if (!m->is_abstract()) {
197 tty->print("default");
198 }
199 tty->cr();
200 }
201 break;
203 case CallInfo::vtable_call:
204 vmindex = info.vtable_index();
205 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
206 assert(receiver_limit->is_subtype_of(m->method_holder()), "virtual call must be type-safe");
207 if (TraceInvokeDynamic) {
208 ResourceMark rm;
209 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
210 Method::name_and_sig_as_C_string(receiver_limit(), m->name(), m->signature()),
211 receiver_limit()->internal_name(), vmindex);
212 m->access_flags().print_on(tty);
213 if (m->is_default_method()) {
214 tty->print("default");
215 }
216 tty->cr();
217 }
218 break;
220 case CallInfo::direct_call:
221 vmindex = Method::nonvirtual_vtable_index;
222 if (m->is_static()) {
223 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
224 } else if (m->is_initializer()) {
225 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
226 assert(receiver_limit == m->method_holder(), "constructor call must be exactly typed");
227 } else {
228 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
229 assert(receiver_limit->is_subtype_of(m->method_holder()), "special call must be type-safe");
230 }
231 break;
233 default: assert(false, "bad CallInfo"); return NULL;
234 }
236 // @CallerSensitive annotation detected
237 if (m->caller_sensitive()) {
238 flags |= CALLER_SENSITIVE;
239 }
241 oop mname_oop = mname();
242 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
243 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
244 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
245 java_lang_invoke_MemberName::set_clazz( mname_oop, receiver_limit->java_mirror());
246 // Note: name and type can be lazily computed by resolve_MemberName,
247 // if Java code needs them as resolved String and MethodType objects.
248 // The clazz must be eagerly stored, because it provides a GC
249 // root to help keep alive the Method*.
250 // If relevant, the vtable or itable value is stored as vmindex.
251 // This is done eagerly, since it is readily available without
252 // constructing any new objects.
253 // TO DO: maybe intern mname_oop
254 m->method_holder()->add_member_name(m->method_idnum(), mname);
256 return mname();
257 }
259 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
260 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
261 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
262 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
263 Metadata* vmtarget = fd.field_holder();
264 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
265 oop mname_oop = mname();
266 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
267 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
268 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
269 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
270 oop type = field_signature_type_or_null(fd.signature());
271 oop name = field_name_or_null(fd.name());
272 if (name != NULL)
273 java_lang_invoke_MemberName::set_name(mname_oop, name);
274 if (type != NULL)
275 java_lang_invoke_MemberName::set_type(mname_oop, type);
276 // Note: name and type can be lazily computed by resolve_MemberName,
277 // if Java code needs them as resolved String and Class objects.
278 // Note that the incoming type oop might be pre-resolved (non-null).
279 // The base clazz and field offset (vmindex) must be eagerly stored,
280 // because they unambiguously identify the field.
281 // Although the fieldDescriptor::_index would also identify the field,
282 // we do not use it, because it is harder to decode.
283 // TO DO: maybe intern mname_oop
284 return mname();
285 }
287 // JVM 2.9 Special Methods:
288 // A method is signature polymorphic if and only if all of the following conditions hold :
289 // * It is declared in the java.lang.invoke.MethodHandle class.
290 // * It has a single formal parameter of type Object[].
291 // * It has a return type of Object.
292 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
293 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
294 if (klass == NULL)
295 return false;
296 // The following test will fail spuriously during bootstrap of MethodHandle itself:
297 // if (klass != SystemDictionary::MethodHandle_klass())
298 // Test the name instead:
299 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
300 return false;
301 Symbol* poly_sig = vmSymbols::object_array_object_signature();
302 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
303 if (m == NULL) return false;
304 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
305 int flags = m->access_flags().as_int();
306 return (flags & required) == required;
307 }
310 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
311 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
312 switch (iid) {
313 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
314 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
315 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
316 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
317 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
318 }
319 assert(false, "");
320 return 0;
321 }
323 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
324 switch (iid) {
325 case vmIntrinsics::_invokeBasic: return 0;
326 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
327 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
328 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
329 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
330 }
331 assert(false, err_msg("iid=%d", iid));
332 return 0;
333 }
335 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
336 vmSymbols::SID name_id = vmSymbols::find_sid(name);
337 switch (name_id) {
338 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
339 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
340 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
341 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
343 // There is one static signature-polymorphic method for each JVM invocation mode.
344 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
345 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
346 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
347 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
348 }
350 // Cover the case of invokeExact and any future variants of invokeFoo.
351 Klass* mh_klass = SystemDictionary::well_known_klass(
352 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
353 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
354 return vmIntrinsics::_invokeGeneric;
356 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
357 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
358 return vmIntrinsics::_none;
359 }
361 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
362 if (klass != NULL &&
363 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
364 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
365 if (iid != vmIntrinsics::_none)
366 return iid;
367 if (is_method_handle_invoke_name(klass, name))
368 return vmIntrinsics::_invokeGeneric;
369 }
370 return vmIntrinsics::_none;
371 }
374 // convert the external string or reflective type to an internal signature
375 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
376 if (java_lang_invoke_MethodType::is_instance(type_str)) {
377 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
378 } else if (java_lang_Class::is_instance(type_str)) {
379 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
380 } else if (java_lang_String::is_instance(type_str)) {
381 if (intern_if_not_found) {
382 return java_lang_String::as_symbol(type_str, CHECK_NULL);
383 } else {
384 return java_lang_String::as_symbol_or_null(type_str);
385 }
386 } else {
387 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
388 }
389 }
391 static const char OBJ_SIG[] = "Ljava/lang/Object;";
392 enum { OBJ_SIG_LEN = 18 };
394 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
395 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
396 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
397 const int len = sig->utf8_length();
398 for (int i = 0; i < len; i++) {
399 switch (sig->byte_at(i)) {
400 case 'L':
401 // only java/lang/Object is valid here
402 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
403 return false;
404 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
405 continue;
406 case '(': case ')': case 'V':
407 case 'I': case 'J': case 'F': case 'D':
408 continue;
409 //case '[':
410 //case 'Z': case 'B': case 'C': case 'S':
411 default:
412 return false;
413 }
414 }
415 return true;
416 }
418 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
419 Symbol* bsig = NULL;
420 if (sig == NULL) {
421 return sig;
422 } else if (is_basic_type_signature(sig)) {
423 sig->increment_refcount();
424 return sig; // that was easy
425 } else if (sig->byte_at(0) != '(') {
426 BasicType bt = char2type(sig->byte_at(0));
427 if (is_subword_type(bt)) {
428 bsig = vmSymbols::int_signature();
429 } else {
430 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
431 bsig = vmSymbols::object_signature();
432 }
433 } else {
434 ResourceMark rm;
435 stringStream buffer(128);
436 buffer.put('(');
437 int arg_pos = 0, keep_arg_pos = -1;
438 if (keep_last_arg)
439 keep_arg_pos = ArgumentCount(sig).size() - 1;
440 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
441 BasicType bt = ss.type();
442 size_t this_arg_pos = buffer.size();
443 if (ss.at_return_type()) {
444 buffer.put(')');
445 }
446 if (arg_pos == keep_arg_pos) {
447 buffer.write((char*) ss.raw_bytes(),
448 (int) ss.raw_length());
449 } else if (bt == T_OBJECT || bt == T_ARRAY) {
450 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
451 } else {
452 if (is_subword_type(bt))
453 bt = T_INT;
454 buffer.put(type2char(bt));
455 }
456 arg_pos++;
457 }
458 const char* sigstr = buffer.base();
459 int siglen = (int) buffer.size();
460 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
461 }
462 assert(is_basic_type_signature(bsig) ||
463 // detune assert in case the injected argument is not a basic type:
464 keep_last_arg, "");
465 return bsig;
466 }
468 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
469 Symbol* sig,
470 bool keep_arrays,
471 bool keep_basic_names) {
472 st = st ? st : tty;
473 int len = sig->utf8_length();
474 int array = 0;
475 bool prev_type = false;
476 for (int i = 0; i < len; i++) {
477 char ch = sig->byte_at(i);
478 switch (ch) {
479 case '(': case ')':
480 prev_type = false;
481 st->put(ch);
482 continue;
483 case '[':
484 if (!keep_basic_names && keep_arrays)
485 st->put(ch);
486 array++;
487 continue;
488 case 'L':
489 {
490 if (prev_type) st->put(',');
491 int start = i+1, slash = start;
492 while (++i < len && (ch = sig->byte_at(i)) != ';') {
493 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
494 }
495 if (slash < i) start = slash;
496 if (!keep_basic_names) {
497 st->put('L');
498 } else {
499 for (int j = start; j < i; j++)
500 st->put(sig->byte_at(j));
501 prev_type = true;
502 }
503 break;
504 }
505 default:
506 {
507 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
508 ch = '[';
509 array = 0;
510 }
511 if (prev_type) st->put(',');
512 const char* n = NULL;
513 if (keep_basic_names)
514 n = type2name(char2type(ch));
515 if (n == NULL) {
516 // unknown letter, or we don't want to know its name
517 st->put(ch);
518 } else {
519 st->print(n);
520 prev_type = true;
521 }
522 break;
523 }
524 }
525 // Switch break goes here to take care of array suffix:
526 if (prev_type) {
527 while (array > 0) {
528 st->print("[]");
529 --array;
530 }
531 }
532 array = 0;
533 }
534 }
538 static oop object_java_mirror() {
539 return SystemDictionary::Object_klass()->java_mirror();
540 }
542 oop MethodHandles::field_name_or_null(Symbol* s) {
543 if (s == NULL) return NULL;
544 return StringTable::lookup(s);
545 }
547 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
548 if (s == NULL) return NULL;
549 BasicType bt = FieldType::basic_type(s);
550 if (is_java_primitive(bt)) {
551 assert(s->utf8_length() == 1, "");
552 return java_lang_Class::primitive_mirror(bt);
553 }
554 // Here are some more short cuts for common types.
555 // They are optional, since reference types can be resolved lazily.
556 if (bt == T_OBJECT) {
557 if (s == vmSymbols::object_signature()) {
558 return object_java_mirror();
559 } else if (s == vmSymbols::class_signature()) {
560 return SystemDictionary::Class_klass()->java_mirror();
561 } else if (s == vmSymbols::string_signature()) {
562 return SystemDictionary::String_klass()->java_mirror();
563 }
564 }
565 return NULL;
566 }
569 // An unresolved member name is a mere symbolic reference.
570 // Resolving it plants a vmtarget/vmindex in it,
571 // which refers directly to JVM internals.
572 Handle MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
573 Handle empty;
574 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
576 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
577 // Already resolved.
578 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
579 assert(vmindex >= Method::nonvirtual_vtable_index, "");
580 return mname;
581 }
583 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
584 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
585 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
586 int flags = java_lang_invoke_MemberName::flags(mname());
587 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
588 if (!ref_kind_is_valid(ref_kind)) {
589 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
590 }
592 DEBUG_ONLY(int old_vmindex);
593 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
595 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
596 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
597 }
599 instanceKlassHandle defc;
600 {
601 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
602 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
603 if (!defc_klass->oop_is_instance()) {
604 if (!defc_klass->oop_is_array()) return empty;
605 defc_klass = SystemDictionary::Object_klass();
606 }
607 defc = instanceKlassHandle(THREAD, defc_klass);
608 }
609 if (defc.is_null()) {
610 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
611 }
612 defc->link_class(CHECK_(empty)); // possible safepoint
614 // convert the external string name to an internal symbol
615 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
616 if (name == NULL) return empty; // no such name
617 if (name == vmSymbols::class_initializer_name())
618 return empty; // illegal name
620 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
621 if ((flags & ALL_KINDS) == IS_METHOD &&
622 (defc() == SystemDictionary::MethodHandle_klass()) &&
623 (ref_kind == JVM_REF_invokeVirtual ||
624 ref_kind == JVM_REF_invokeSpecial ||
625 // static invocation mode is required for _linkToVirtual, etc.:
626 ref_kind == JVM_REF_invokeStatic)) {
627 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
628 if (iid != vmIntrinsics::_none &&
629 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
630 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
631 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
632 mh_invoke_id = iid;
633 }
634 }
636 // convert the external string or reflective type to an internal signature
637 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
638 if (type == NULL) return empty; // no such signature exists in the VM
640 // Time to do the lookup.
641 switch (flags & ALL_KINDS) {
642 case IS_METHOD:
643 {
644 CallInfo result;
645 {
646 assert(!HAS_PENDING_EXCEPTION, "");
647 if (ref_kind == JVM_REF_invokeStatic) {
648 LinkResolver::resolve_static_call(result,
649 defc, name, type, KlassHandle(), false, false, THREAD);
650 } else if (ref_kind == JVM_REF_invokeInterface) {
651 LinkResolver::resolve_interface_call(result, Handle(), defc,
652 defc, name, type, KlassHandle(), false, false, THREAD);
653 } else if (mh_invoke_id != vmIntrinsics::_none) {
654 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
655 LinkResolver::resolve_handle_call(result,
656 defc, name, type, KlassHandle(), THREAD);
657 } else if (ref_kind == JVM_REF_invokeSpecial) {
658 LinkResolver::resolve_special_call(result,
659 defc, name, type, KlassHandle(), false, THREAD);
660 } else if (ref_kind == JVM_REF_invokeVirtual) {
661 LinkResolver::resolve_virtual_call(result, Handle(), defc,
662 defc, name, type, KlassHandle(), false, false, THREAD);
663 } else {
664 assert(false, err_msg("ref_kind=%d", ref_kind));
665 }
666 if (HAS_PENDING_EXCEPTION) {
667 return empty;
668 }
669 }
670 if (result.resolved_appendix().not_null()) {
671 // The resolved MemberName must not be accompanied by an appendix argument,
672 // since there is no way to bind this value into the MemberName.
673 // Caller is responsible to prevent this from happening.
674 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
675 }
676 oop mname2 = init_method_MemberName(mname, result);
677 return Handle(THREAD, mname2);
678 }
679 case IS_CONSTRUCTOR:
680 {
681 CallInfo result;
682 {
683 assert(!HAS_PENDING_EXCEPTION, "");
684 if (name == vmSymbols::object_initializer_name()) {
685 LinkResolver::resolve_special_call(result,
686 defc, name, type, KlassHandle(), false, THREAD);
687 } else {
688 break; // will throw after end of switch
689 }
690 if (HAS_PENDING_EXCEPTION) {
691 return empty;
692 }
693 }
694 assert(result.is_statically_bound(), "");
695 oop mname2 = init_method_MemberName(mname, result);
696 return Handle(THREAD, mname2);
697 }
698 case IS_FIELD:
699 {
700 fieldDescriptor result; // find_field initializes fd if found
701 {
702 assert(!HAS_PENDING_EXCEPTION, "");
703 LinkResolver::resolve_field(result, defc, name, type, KlassHandle(), Bytecodes::_nop, false, false, THREAD);
704 if (HAS_PENDING_EXCEPTION) {
705 return empty;
706 }
707 }
708 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
709 return Handle(THREAD, mname2);
710 }
711 default:
712 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
713 }
715 return empty;
716 }
718 // Conversely, a member name which is only initialized from JVM internals
719 // may have null defc, name, and type fields.
720 // Resolving it plants a vmtarget/vmindex in it,
721 // which refers directly to JVM internals.
722 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
723 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
724 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
725 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
726 if (vmtarget == NULL) {
727 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
728 }
730 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
731 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
732 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
733 int flags = java_lang_invoke_MemberName::flags(mname());
735 if (suppress != 0) {
736 if (suppress & _suppress_defc) have_defc = true;
737 if (suppress & _suppress_name) have_name = true;
738 if (suppress & _suppress_type) have_type = true;
739 }
741 if (have_defc && have_name && have_type) return; // nothing needed
743 switch (flags & ALL_KINDS) {
744 case IS_METHOD:
745 case IS_CONSTRUCTOR:
746 {
747 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
748 methodHandle m(THREAD, (Method*)vmtarget);
749 DEBUG_ONLY(vmtarget = NULL); // safety
750 if (m.is_null()) break;
751 if (!have_defc) {
752 InstanceKlass* defc = m->method_holder();
753 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
754 }
755 if (!have_name) {
756 //not java_lang_String::create_from_symbol; let's intern member names
757 Handle name = StringTable::intern(m->name(), CHECK);
758 java_lang_invoke_MemberName::set_name(mname(), name());
759 }
760 if (!have_type) {
761 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
762 java_lang_invoke_MemberName::set_type(mname(), type());
763 }
764 return;
765 }
766 case IS_FIELD:
767 {
768 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
769 if (!((Klass*) vmtarget)->oop_is_instance()) break;
770 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
771 DEBUG_ONLY(vmtarget = NULL); // safety
772 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
773 fieldDescriptor fd; // find_field initializes fd if found
774 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
775 break; // cannot expand
776 if (!have_defc) {
777 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
778 }
779 if (!have_name) {
780 //not java_lang_String::create_from_symbol; let's intern member names
781 Handle name = StringTable::intern(fd.name(), CHECK);
782 java_lang_invoke_MemberName::set_name(mname(), name());
783 }
784 if (!have_type) {
785 // If it is a primitive field type, don't mess with short strings like "I".
786 Handle type = field_signature_type_or_null(fd.signature());
787 if (type.is_null()) {
788 java_lang_String::create_from_symbol(fd.signature(), CHECK);
789 }
790 java_lang_invoke_MemberName::set_type(mname(), type());
791 }
792 return;
793 }
794 }
795 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
796 }
798 int MethodHandles::find_MemberNames(KlassHandle k,
799 Symbol* name, Symbol* sig,
800 int mflags, KlassHandle caller,
801 int skip, objArrayHandle results) {
802 // %%% take caller into account!
804 Thread* thread = Thread::current();
806 if (k.is_null() || !k->oop_is_instance()) return -1;
808 int rfill = 0, rlimit = results->length(), rskip = skip;
809 // overflow measurement:
810 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
812 int match_flags = mflags;
813 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
814 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
815 bool local_only = !(search_superc | search_intfc);
816 bool classes_only = false;
818 if (name != NULL) {
819 if (name->utf8_length() == 0) return 0; // a match is not possible
820 }
821 if (sig != NULL) {
822 if (sig->utf8_length() == 0) return 0; // a match is not possible
823 if (sig->byte_at(0) == '(')
824 match_flags &= ~(IS_FIELD | IS_TYPE);
825 else
826 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
827 }
829 if ((match_flags & IS_TYPE) != 0) {
830 // NYI, and Core Reflection works quite well for this query
831 }
833 if ((match_flags & IS_FIELD) != 0) {
834 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
835 if (name != NULL && st.name() != name)
836 continue;
837 if (sig != NULL && st.signature() != sig)
838 continue;
839 // passed the filters
840 if (rskip > 0) {
841 --rskip;
842 } else if (rfill < rlimit) {
843 Handle result(thread, results->obj_at(rfill++));
844 if (!java_lang_invoke_MemberName::is_instance(result()))
845 return -99; // caller bug!
846 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
847 if (saved != result())
848 results->obj_at_put(rfill-1, saved); // show saved instance to user
849 } else if (++overflow >= overflow_limit) {
850 match_flags = 0; break; // got tired of looking at overflow
851 }
852 }
853 }
855 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
856 // watch out for these guys:
857 Symbol* init_name = vmSymbols::object_initializer_name();
858 Symbol* clinit_name = vmSymbols::class_initializer_name();
859 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
860 bool negate_name_test = false;
861 // fix name so that it captures the intention of IS_CONSTRUCTOR
862 if (!(match_flags & IS_METHOD)) {
863 // constructors only
864 if (name == NULL) {
865 name = init_name;
866 } else if (name != init_name) {
867 return 0; // no constructors of this method name
868 }
869 } else if (!(match_flags & IS_CONSTRUCTOR)) {
870 // methods only
871 if (name == NULL) {
872 name = init_name;
873 negate_name_test = true; // if we see the name, we *omit* the entry
874 } else if (name == init_name) {
875 return 0; // no methods of this constructor name
876 }
877 } else {
878 // caller will accept either sort; no need to adjust name
879 }
880 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
881 Method* m = st.method();
882 Symbol* m_name = m->name();
883 if (m_name == clinit_name)
884 continue;
885 if (name != NULL && ((m_name != name) ^ negate_name_test))
886 continue;
887 if (sig != NULL && m->signature() != sig)
888 continue;
889 // passed the filters
890 if (rskip > 0) {
891 --rskip;
892 } else if (rfill < rlimit) {
893 Handle result(thread, results->obj_at(rfill++));
894 if (!java_lang_invoke_MemberName::is_instance(result()))
895 return -99; // caller bug!
896 CallInfo info(m);
897 oop saved = MethodHandles::init_method_MemberName(result, info);
898 if (saved != result())
899 results->obj_at_put(rfill-1, saved); // show saved instance to user
900 } else if (++overflow >= overflow_limit) {
901 match_flags = 0; break; // got tired of looking at overflow
902 }
903 }
904 }
906 // return number of elements we at leasted wanted to initialize
907 return rfill + overflow;
908 }
910 //------------------------------------------------------------------------------
911 // MemberNameTable
912 //
914 MemberNameTable::MemberNameTable(int methods_cnt)
915 : GrowableArray<jweak>(methods_cnt, true) {
916 assert_locked_or_safepoint(MemberNameTable_lock);
917 }
919 MemberNameTable::~MemberNameTable() {
920 assert_locked_or_safepoint(MemberNameTable_lock);
921 int len = this->length();
923 for (int idx = 0; idx < len; idx++) {
924 jweak ref = this->at(idx);
925 JNIHandles::destroy_weak_global(ref);
926 }
927 }
929 void MemberNameTable::add_member_name(int index, jweak mem_name_wref) {
930 assert_locked_or_safepoint(MemberNameTable_lock);
931 this->at_put_grow(index, mem_name_wref);
932 }
934 // Return a member name oop or NULL.
935 oop MemberNameTable::get_member_name(int index) {
936 assert_locked_or_safepoint(MemberNameTable_lock);
938 jweak ref = this->at(index);
939 oop mem_name = JNIHandles::resolve(ref);
940 return mem_name;
941 }
943 #if INCLUDE_JVMTI
944 oop MemberNameTable::find_member_name_by_method(Method* old_method) {
945 assert_locked_or_safepoint(MemberNameTable_lock);
946 oop found = NULL;
947 int len = this->length();
949 for (int idx = 0; idx < len; idx++) {
950 oop mem_name = JNIHandles::resolve(this->at(idx));
951 if (mem_name == NULL) {
952 continue;
953 }
954 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
955 if (method == old_method) {
956 found = mem_name;
957 break;
958 }
959 }
960 return found;
961 }
963 // It is called at safepoint only
964 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
965 int methods_length, bool *trace_name_printed) {
966 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
967 // search the MemberNameTable for uses of either obsolete or EMCP methods
968 for (int j = 0; j < methods_length; j++) {
969 Method* old_method = old_methods[j];
970 Method* new_method = new_methods[j];
971 oop mem_name = find_member_name_by_method(old_method);
972 if (mem_name != NULL) {
973 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method);
975 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
976 if (!(*trace_name_printed)) {
977 // RC_TRACE_MESG macro has an embedded ResourceMark
978 RC_TRACE_MESG(("adjust: name=%s",
979 old_method->method_holder()->external_name()));
980 *trace_name_printed = true;
981 }
982 // RC_TRACE macro has an embedded ResourceMark
983 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
984 new_method->name()->as_C_string(),
985 new_method->signature()->as_C_string()));
986 }
987 }
988 }
989 }
990 #endif // INCLUDE_JVMTI
992 //
993 // Here are the native methods in java.lang.invoke.MethodHandleNatives
994 // They are the private interface between this JVM and the HotSpot-specific
995 // Java code that implements JSR 292 method handles.
996 //
997 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
998 // that intrinsic (non-JNI) native methods are defined in HotSpot.
999 //
1001 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
1002 switch (which) {
1003 case MethodHandles::GC_COUNT_GWT:
1004 #ifdef COMPILER2
1005 return true;
1006 #else
1007 return false;
1008 #endif
1009 }
1010 return 0;
1011 }
1012 JVM_END
1014 #ifndef PRODUCT
1015 #define EACH_NAMED_CON(template, requirement) \
1016 template(MethodHandles,GC_COUNT_GWT) \
1017 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1018 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1019 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1020 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1021 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1022 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1023 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1024 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1025 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1026 template(MethodHandles,GC_LAMBDA_SUPPORT) \
1027 /*end*/
1029 #define IGNORE_REQ(req_expr) /* req_expr */
1030 #define ONE_PLUS(scope,value) 1+
1031 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1032 #define VALUE_COMMA(scope,value) scope::value,
1033 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1034 #define STRING_NULL(scope,value) #value "\0"
1035 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1037 static bool advertise_con_value(int which) {
1038 if (which < 0) return false;
1039 bool ok = true;
1040 int count = 0;
1041 #define INC_COUNT(scope,value) \
1042 ++count;
1043 #define CHECK_REQ(req_expr) \
1044 if (which < count) return ok; \
1045 ok = (req_expr);
1046 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1047 #undef INC_COUNT
1048 #undef CHECK_REQ
1049 assert(count == con_value_count, "");
1050 if (which < count) return ok;
1051 return false;
1052 }
1054 #undef ONE_PLUS
1055 #undef VALUE_COMMA
1056 #undef STRING_NULL
1057 #undef EACH_NAMED_CON
1058 #endif // PRODUCT
1060 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1061 #ifndef PRODUCT
1062 if (advertise_con_value(which)) {
1063 assert(which >= 0 && which < con_value_count, "");
1064 int con = con_values[which];
1065 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1066 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1067 const char* str = &con_names[0];
1068 for (int i = 0; i < which; i++)
1069 str += strlen(str) + 1; // skip name and null
1070 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1071 box->obj_at_put(0, name);
1072 }
1073 return con;
1074 }
1075 #endif
1076 return 0;
1077 }
1078 JVM_END
1080 // void init(MemberName self, AccessibleObject ref)
1081 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1082 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1083 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1084 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1085 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1086 MethodHandles::init_MemberName(mname, target);
1087 }
1088 JVM_END
1090 // void expand(MemberName self)
1091 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1092 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1093 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1094 MethodHandles::expand_MemberName(mname, 0, CHECK);
1095 }
1096 JVM_END
1098 // void resolve(MemberName self, Class<?> caller)
1099 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1100 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1101 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1103 // The trusted Java code that calls this method should already have performed
1104 // access checks on behalf of the given caller. But, we can verify this.
1105 if (VerifyMethodHandles && caller_jh != NULL &&
1106 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1107 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1108 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1109 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1110 }
1112 // Reflection::verify_class_access can only handle instance classes.
1113 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1114 // Emulate LinkResolver::check_klass_accessability.
1115 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1116 if (!Reflection::verify_class_access(caller,
1117 reference_klass,
1118 true)) {
1119 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1120 }
1121 }
1122 }
1124 Handle resolved = MethodHandles::resolve_MemberName(mname, CHECK_NULL);
1125 if (resolved.is_null()) {
1126 int flags = java_lang_invoke_MemberName::flags(mname());
1127 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1128 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1129 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1130 }
1131 if ((flags & ALL_KINDS) == IS_FIELD) {
1132 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1133 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1134 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1135 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1136 } else {
1137 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1138 }
1139 }
1141 return JNIHandles::make_local(THREAD, resolved());
1142 }
1143 JVM_END
1145 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1146 if (mname == NULL ||
1147 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1148 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1149 } else {
1150 int flags = java_lang_invoke_MemberName::flags(mname);
1151 if ((flags & IS_FIELD) != 0 &&
1152 (must_be_static
1153 ? (flags & JVM_ACC_STATIC) != 0
1154 : (flags & JVM_ACC_STATIC) == 0)) {
1155 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1156 return (jlong) vmindex;
1157 }
1158 }
1159 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1160 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1161 return 0;
1162 }
1164 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1165 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1166 }
1167 JVM_END
1169 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1170 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1171 }
1172 JVM_END
1174 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1175 // use the other function to perform sanity checks:
1176 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1177 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1178 return JNIHandles::make_local(THREAD, clazz);
1179 }
1180 JVM_END
1182 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1183 if (mname_jh == NULL) return NULL;
1184 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1185 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1186 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1187 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1188 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1189 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1190 result->obj_at_put(0, x);
1191 x = NULL;
1192 if (vmtarget == NULL) {
1193 x = NULL;
1194 } else if (vmtarget->is_klass()) {
1195 x = ((Klass*) vmtarget)->java_mirror();
1196 } else if (vmtarget->is_method()) {
1197 x = mname();
1198 }
1199 result->obj_at_put(1, x);
1200 return JNIHandles::make_local(env, result());
1201 }
1202 JVM_END
1206 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1207 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1208 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1209 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1210 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1211 if (clazz_jh == NULL || results_jh == NULL) return -1;
1212 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1214 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1215 if (results.is_null() || !results->is_objArray()) return -1;
1217 TempNewSymbol name = NULL;
1218 TempNewSymbol sig = NULL;
1219 if (name_jh != NULL) {
1220 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1221 if (name == NULL) return 0; // a match is not possible
1222 }
1223 if (sig_jh != NULL) {
1224 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1225 if (sig == NULL) return 0; // a match is not possible
1226 }
1228 KlassHandle caller;
1229 if (caller_jh != NULL) {
1230 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1231 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1232 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1233 }
1235 if (name != NULL && sig != NULL && results.not_null()) {
1236 // try a direct resolve
1237 // %%% TO DO
1238 }
1240 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1241 caller, skip, results);
1242 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1243 return res;
1244 }
1245 JVM_END
1247 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1248 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1249 Handle target (THREAD, JNIHandles::resolve(target_jh));
1250 {
1251 // Walk all nmethods depending on this call site.
1252 MutexLocker mu(Compile_lock, thread);
1253 Universe::flush_dependents_on(call_site, target);
1254 java_lang_invoke_CallSite::set_target(call_site(), target());
1255 }
1256 }
1257 JVM_END
1259 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1260 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1261 Handle target (THREAD, JNIHandles::resolve(target_jh));
1262 {
1263 // Walk all nmethods depending on this call site.
1264 MutexLocker mu(Compile_lock, thread);
1265 Universe::flush_dependents_on(call_site, target);
1266 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1267 }
1268 }
1269 JVM_END
1271 /**
1272 * Throws a java/lang/UnsupportedOperationException unconditionally.
1273 * This is required by the specification of MethodHandle.invoke if
1274 * invoked directly.
1275 */
1276 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1277 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1278 return NULL;
1279 }
1280 JVM_END
1282 /**
1283 * Throws a java/lang/UnsupportedOperationException unconditionally.
1284 * This is required by the specification of MethodHandle.invokeExact if
1285 * invoked directly.
1286 */
1287 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1288 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1289 return NULL;
1290 }
1291 JVM_END
1293 /// JVM_RegisterMethodHandleMethods
1295 #undef CS // Solaris builds complain
1297 #define LANG "Ljava/lang/"
1298 #define JLINV "Ljava/lang/invoke/"
1300 #define OBJ LANG"Object;"
1301 #define CLS LANG"Class;"
1302 #define STRG LANG"String;"
1303 #define CS JLINV"CallSite;"
1304 #define MT JLINV"MethodType;"
1305 #define MH JLINV"MethodHandle;"
1306 #define MEM JLINV"MemberName;"
1308 #define CC (char*) /*cast a literal from (const char*)*/
1309 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1311 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1312 static JNINativeMethod MHN_methods[] = {
1313 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1314 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1315 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1316 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1317 // static native int getNamedCon(int which, Object[] name)
1318 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1319 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1320 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1321 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1322 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1323 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1324 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1325 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1326 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1327 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1328 };
1330 static JNINativeMethod MH_methods[] = {
1331 // UnsupportedOperationException throwers
1332 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1333 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1334 };
1336 /**
1337 * Helper method to register native methods.
1338 */
1339 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1340 int status = env->RegisterNatives(clazz, methods, nMethods);
1341 if (status != JNI_OK || env->ExceptionOccurred()) {
1342 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1343 env->ExceptionClear();
1344 return false;
1345 }
1346 return true;
1347 }
1349 /**
1350 * This one function is exported, used by NativeLookup.
1351 */
1352 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1353 if (!EnableInvokeDynamic) {
1354 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
1355 return; // bind nothing
1356 }
1358 assert(!MethodHandles::enabled(), "must not be enabled");
1359 bool enable_MH = true;
1361 jclass MH_class = NULL;
1362 if (SystemDictionary::MethodHandle_klass() == NULL) {
1363 enable_MH = false;
1364 } else {
1365 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1366 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1367 }
1369 if (enable_MH) {
1370 ThreadToNativeFromVM ttnfv(thread);
1372 if (enable_MH) {
1373 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1374 }
1375 if (enable_MH) {
1376 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1377 }
1378 }
1380 if (TraceInvokeDynamic) {
1381 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1382 }
1384 if (enable_MH) {
1385 MethodHandles::generate_adapters();
1386 MethodHandles::set_enabled(true);
1387 }
1388 }
1389 JVM_END