1 /*
2 * Copyright (c) 2008, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/stringTable.hpp"
27 #include "compiler/compileBroker.hpp"
28 #include "interpreter/interpreter.hpp"
29 #include "interpreter/oopMapCache.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "prims/jvmtiRedefineClassesTrace.hpp"
33 #include "prims/methodHandles.hpp"
34 #include "runtime/compilationPolicy.hpp"
35 #include "runtime/javaCalls.hpp"
36 #include "runtime/reflection.hpp"
37 #include "runtime/signature.hpp"
38 #include "runtime/stubRoutines.hpp"
39 #include "utilities/exceptions.hpp"
40
41
42 /*
43 * JSR 292 reference implementation: method handles
44 * The JDK 7 reference implementation represented method handle
45 * combinations as chains. Each link in the chain had a "vmentry"
46 * field which pointed at a bit of assembly code which performed
47 * one transformation before dispatching to the next link in the chain.
48 *
49 * The current reference implementation pushes almost all code generation
50 * responsibility to (trusted) Java code. A method handle contains a
51 * pointer to its "LambdaForm", which embodies all details of the method
52 * handle's behavior. The LambdaForm is a normal Java object, managed
53 * by a runtime coded in Java.
54 */
55
56 bool MethodHandles::_enabled = false; // set true after successful native linkage
57 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
58
59
60 /**
61 * Generates method handle adapters. Returns 'false' if memory allocation
62 * failed and true otherwise.
63 */
64 bool MethodHandles::generate_adapters() {
65 if (SystemDictionary::MethodHandle_klass() == NULL) {
66 return true;
67 }
68
69 assert(_adapter_code == NULL, "generate only once");
70
71 ResourceMark rm;
72 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
73 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
74 if (_adapter_code == NULL) {
75 return false;
76 }
77
78 CodeBuffer code(_adapter_code);
79 MethodHandlesAdapterGenerator g(&code);
80 g.generate();
81 code.log_section_sizes("MethodHandlesAdapterBlob");
82 return true;
83 }
84
85 //------------------------------------------------------------------------------
86 // MethodHandlesAdapterGenerator::generate
87 //
88 void MethodHandlesAdapterGenerator::generate() {
89 // Generate generic method handle adapters.
90 // Generate interpreter entries
91 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
92 mk <= Interpreter::method_handle_invoke_LAST;
93 mk = Interpreter::MethodKind(1 + (int)mk)) {
94 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
95 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
96 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
97 if (entry != NULL) {
98 Interpreter::set_entry_for_kind(mk, entry);
99 }
100 // If the entry is not set, it will throw AbstractMethodError.
101 }
102 }
103
104 void MethodHandles::set_enabled(bool z) {
105 if (_enabled != z) {
106 guarantee(z, "can only enable once");
107 _enabled = z;
108 }
109 }
110
111 // MemberName support
112
113 // import java_lang_invoke_MemberName.*
114 enum {
115 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
116 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
117 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
118 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
119 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
120 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
121 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
122 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
123 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
124 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
125 };
126
127 Handle MethodHandles::new_MemberName(TRAPS) {
128 Handle empty;
129 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
130 if (!k->is_initialized()) k->initialize(CHECK_(empty));
131 return Handle(THREAD, k->allocate_instance(THREAD));
132 }
133
134 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
135 // This method is used from java.lang.invoke.MemberName constructors.
136 // It fills in the new MemberName from a java.lang.reflect.Member.
137 Thread* thread = Thread::current();
138 oop target_oop = target();
139 Klass* target_klass = target_oop->klass();
140 if (target_klass == SystemDictionary::reflect_Field_klass()) {
141 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
142 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
143 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
144 if (!k.is_null() && k->oop_is_instance()) {
145 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
146 oop mname2 = init_field_MemberName(mname, fd);
147 if (mname2 != NULL) {
148 // Since we have the reified name and type handy, add them to the result.
149 if (java_lang_invoke_MemberName::name(mname2) == NULL)
150 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
151 if (java_lang_invoke_MemberName::type(mname2) == NULL)
152 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
153 }
154 return mname2;
155 }
156 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
157 oop clazz = java_lang_reflect_Method::clazz(target_oop);
158 int slot = java_lang_reflect_Method::slot(target_oop);
159 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
160 if (!k.is_null() && k->oop_is_instance()) {
161 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
162 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
163 return NULL; // do not resolve unless there is a concrete signature
164 CallInfo info(m, k());
165 return init_method_MemberName(mname, info);
166 }
167 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
168 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
169 int slot = java_lang_reflect_Constructor::slot(target_oop);
170 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
171 if (!k.is_null() && k->oop_is_instance()) {
172 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
173 if (m == NULL) return NULL;
174 CallInfo info(m, k());
175 return init_method_MemberName(mname, info);
176 }
177 }
178 return NULL;
179 }
180
181 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
182 assert(info.resolved_appendix().is_null(), "only normal methods here");
183 methodHandle m = info.resolved_method();
184 KlassHandle m_klass = m->method_holder();
185 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
186 int vmindex = Method::invalid_vtable_index;
187
188 switch (info.call_kind()) {
189 case CallInfo::itable_call:
190 vmindex = info.itable_index();
191 // More importantly, the itable index only works with the method holder.
192 assert(m_klass->verify_itable_index(vmindex), "");
193 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
194 if (TraceInvokeDynamic) {
195 ResourceMark rm;
196 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
197 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
198 vmindex);
199 m->access_flags().print_on(tty);
200 if (!m->is_abstract()) {
201 tty->print("default");
202 }
203 tty->cr();
204 }
205 break;
206
207 case CallInfo::vtable_call:
208 vmindex = info.vtable_index();
209 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
210 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
211 if (m_klass->is_interface()) {
212 // This is a vtable call to an interface method (abstract "miranda method" or default method).
213 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
214 // (LinkResolver should help us figure this out.)
215 KlassHandle m_klass_non_interface = info.resolved_klass();
216 if (m_klass_non_interface->is_interface()) {
217 m_klass_non_interface = SystemDictionary::Object_klass();
218 #ifdef ASSERT
219 { ResourceMark rm;
220 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
221 assert(m->name() == m2->name() && m->signature() == m2->signature(),
222 err_msg("at %d, %s != %s", vmindex,
223 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
224 }
225 #endif //ASSERT
226 }
227 if (!m->is_public()) {
228 assert(m->is_public(), "virtual call must be to public interface method");
229 return NULL; // elicit an error later in product build
230 }
231 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
232 m_klass = m_klass_non_interface;
233 }
234 if (TraceInvokeDynamic) {
235 ResourceMark rm;
236 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
237 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
238 m_klass->internal_name(), vmindex);
239 m->access_flags().print_on(tty);
240 if (m->is_default_method()) {
241 tty->print("default");
242 }
243 tty->cr();
244 }
245 break;
246
247 case CallInfo::direct_call:
248 vmindex = Method::nonvirtual_vtable_index;
249 if (m->is_static()) {
250 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
251 } else if (m->is_initializer()) {
252 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
253 } else {
254 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
255 }
256 break;
257
258 default: assert(false, "bad CallInfo"); return NULL;
259 }
260
261 // @CallerSensitive annotation detected
262 if (m->caller_sensitive()) {
263 flags |= CALLER_SENSITIVE;
264 }
265
266 oop mname_oop = mname();
267 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
268 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
269 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
270 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
271 // Note: name and type can be lazily computed by resolve_MemberName,
272 // if Java code needs them as resolved String and MethodType objects.
273 // The clazz must be eagerly stored, because it provides a GC
274 // root to help keep alive the Method*.
275 // If relevant, the vtable or itable value is stored as vmindex.
276 // This is done eagerly, since it is readily available without
277 // constructing any new objects.
278 // TO DO: maybe intern mname_oop
279 m->method_holder()->add_member_name(m->method_idnum(), mname);
280
281 return mname();
282 }
283
284 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
285 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
286 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
287 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
288 Metadata* vmtarget = fd.field_holder();
289 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
290 oop mname_oop = mname();
291 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
292 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
293 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
294 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
295 oop type = field_signature_type_or_null(fd.signature());
296 oop name = field_name_or_null(fd.name());
297 if (name != NULL)
298 java_lang_invoke_MemberName::set_name(mname_oop, name);
299 if (type != NULL)
300 java_lang_invoke_MemberName::set_type(mname_oop, type);
301 // Note: name and type can be lazily computed by resolve_MemberName,
302 // if Java code needs them as resolved String and Class objects.
303 // Note that the incoming type oop might be pre-resolved (non-null).
304 // The base clazz and field offset (vmindex) must be eagerly stored,
305 // because they unambiguously identify the field.
306 // Although the fieldDescriptor::_index would also identify the field,
307 // we do not use it, because it is harder to decode.
308 // TO DO: maybe intern mname_oop
309 return mname();
310 }
311
312 // JVM 2.9 Special Methods:
313 // A method is signature polymorphic if and only if all of the following conditions hold :
314 // * It is declared in the java.lang.invoke.MethodHandle class.
315 // * It has a single formal parameter of type Object[].
316 // * It has a return type of Object.
317 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
318 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
319 if (klass == NULL)
320 return false;
321 // The following test will fail spuriously during bootstrap of MethodHandle itself:
322 // if (klass != SystemDictionary::MethodHandle_klass())
323 // Test the name instead:
324 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
325 return false;
326 Symbol* poly_sig = vmSymbols::object_array_object_signature();
327 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
328 if (m == NULL) return false;
329 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
330 int flags = m->access_flags().as_int();
331 return (flags & required) == required;
332 }
333
334
335 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
336 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
337 switch (iid) {
338 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
339 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
340 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
341 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
342 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
343 }
344 assert(false, "");
345 return 0;
346 }
347
348 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
349 switch (iid) {
350 case vmIntrinsics::_invokeBasic: return 0;
351 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
352 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
353 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
354 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
355 }
356 assert(false, err_msg("iid=%d", iid));
357 return 0;
358 }
359
360 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
361 vmSymbols::SID name_id = vmSymbols::find_sid(name);
362 switch (name_id) {
363 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
364 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
365 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
366 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
367
368 // There is one static signature-polymorphic method for each JVM invocation mode.
369 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
370 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
371 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
372 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
373 }
374
375 // Cover the case of invokeExact and any future variants of invokeFoo.
376 Klass* mh_klass = SystemDictionary::well_known_klass(
377 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
378 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
379 return vmIntrinsics::_invokeGeneric;
380
381 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
382 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
383 return vmIntrinsics::_none;
384 }
385
386 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
387 if (klass != NULL &&
388 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
389 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
390 if (iid != vmIntrinsics::_none)
391 return iid;
392 if (is_method_handle_invoke_name(klass, name))
393 return vmIntrinsics::_invokeGeneric;
394 }
395 return vmIntrinsics::_none;
396 }
397
398
399 // convert the external string or reflective type to an internal signature
400 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
401 if (java_lang_invoke_MethodType::is_instance(type_str)) {
402 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
403 } else if (java_lang_Class::is_instance(type_str)) {
404 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
405 } else if (java_lang_String::is_instance(type_str)) {
406 if (intern_if_not_found) {
407 return java_lang_String::as_symbol(type_str, CHECK_NULL);
408 } else {
409 return java_lang_String::as_symbol_or_null(type_str);
410 }
411 } else {
412 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
413 }
414 }
415
416 static const char OBJ_SIG[] = "Ljava/lang/Object;";
417 enum { OBJ_SIG_LEN = 18 };
418
419 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
420 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
421 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
422 const int len = sig->utf8_length();
423 for (int i = 0; i < len; i++) {
424 switch (sig->byte_at(i)) {
425 case 'L':
426 // only java/lang/Object is valid here
427 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
428 return false;
429 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
430 continue;
431 case '(': case ')': case 'V':
432 case 'I': case 'J': case 'F': case 'D':
433 continue;
434 //case '[':
435 //case 'Z': case 'B': case 'C': case 'S':
436 default:
437 return false;
438 }
439 }
440 return true;
441 }
442
443 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
444 Symbol* bsig = NULL;
445 if (sig == NULL) {
446 return sig;
447 } else if (is_basic_type_signature(sig)) {
448 sig->increment_refcount();
449 return sig; // that was easy
450 } else if (sig->byte_at(0) != '(') {
451 BasicType bt = char2type(sig->byte_at(0));
452 if (is_subword_type(bt)) {
453 bsig = vmSymbols::int_signature();
454 } else {
455 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
456 bsig = vmSymbols::object_signature();
457 }
458 } else {
459 ResourceMark rm;
460 stringStream buffer(128);
461 buffer.put('(');
462 int arg_pos = 0, keep_arg_pos = -1;
463 if (keep_last_arg)
464 keep_arg_pos = ArgumentCount(sig).size() - 1;
465 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
466 BasicType bt = ss.type();
467 size_t this_arg_pos = buffer.size();
468 if (ss.at_return_type()) {
469 buffer.put(')');
470 }
471 if (arg_pos == keep_arg_pos) {
472 buffer.write((char*) ss.raw_bytes(),
473 (int) ss.raw_length());
474 } else if (bt == T_OBJECT || bt == T_ARRAY) {
475 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
476 } else {
477 if (is_subword_type(bt))
478 bt = T_INT;
479 buffer.put(type2char(bt));
480 }
481 arg_pos++;
482 }
483 const char* sigstr = buffer.base();
484 int siglen = (int) buffer.size();
485 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
486 }
487 assert(is_basic_type_signature(bsig) ||
488 // detune assert in case the injected argument is not a basic type:
489 keep_last_arg, "");
490 return bsig;
491 }
492
493 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
494 Symbol* sig,
495 bool keep_arrays,
496 bool keep_basic_names) {
497 st = st ? st : tty;
498 int len = sig->utf8_length();
499 int array = 0;
500 bool prev_type = false;
501 for (int i = 0; i < len; i++) {
502 char ch = sig->byte_at(i);
503 switch (ch) {
504 case '(': case ')':
505 prev_type = false;
506 st->put(ch);
507 continue;
508 case '[':
509 if (!keep_basic_names && keep_arrays)
510 st->put(ch);
511 array++;
512 continue;
513 case 'L':
514 {
515 if (prev_type) st->put(',');
516 int start = i+1, slash = start;
517 while (++i < len && (ch = sig->byte_at(i)) != ';') {
518 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
519 }
520 if (slash < i) start = slash;
521 if (!keep_basic_names) {
522 st->put('L');
523 } else {
524 for (int j = start; j < i; j++)
525 st->put(sig->byte_at(j));
526 prev_type = true;
527 }
528 break;
529 }
530 default:
531 {
532 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
533 ch = '[';
534 array = 0;
535 }
536 if (prev_type) st->put(',');
537 const char* n = NULL;
538 if (keep_basic_names)
539 n = type2name(char2type(ch));
540 if (n == NULL) {
541 // unknown letter, or we don't want to know its name
542 st->put(ch);
543 } else {
544 st->print("%s", n);
545 prev_type = true;
546 }
547 break;
548 }
549 }
550 // Switch break goes here to take care of array suffix:
551 if (prev_type) {
552 while (array > 0) {
553 st->print("[]");
554 --array;
555 }
556 }
557 array = 0;
558 }
559 }
560
561
562
563 static oop object_java_mirror() {
564 return SystemDictionary::Object_klass()->java_mirror();
565 }
566
567 oop MethodHandles::field_name_or_null(Symbol* s) {
568 if (s == NULL) return NULL;
569 return StringTable::lookup(s);
570 }
571
572 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
573 if (s == NULL) return NULL;
574 BasicType bt = FieldType::basic_type(s);
575 if (is_java_primitive(bt)) {
576 assert(s->utf8_length() == 1, "");
577 return java_lang_Class::primitive_mirror(bt);
578 }
579 // Here are some more short cuts for common types.
580 // They are optional, since reference types can be resolved lazily.
581 if (bt == T_OBJECT) {
582 if (s == vmSymbols::object_signature()) {
583 return object_java_mirror();
584 } else if (s == vmSymbols::class_signature()) {
585 return SystemDictionary::Class_klass()->java_mirror();
586 } else if (s == vmSymbols::string_signature()) {
587 return SystemDictionary::String_klass()->java_mirror();
588 }
589 }
590 return NULL;
591 }
592
593
594 // An unresolved member name is a mere symbolic reference.
595 // Resolving it plants a vmtarget/vmindex in it,
596 // which refers directly to JVM internals.
597 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
598 Handle empty;
599 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
600
601 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
602 // Already resolved.
603 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
604 assert(vmindex >= Method::nonvirtual_vtable_index, "");
605 return mname;
606 }
607
608 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
609 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
610 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
611 int flags = java_lang_invoke_MemberName::flags(mname());
612 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
613 if (!ref_kind_is_valid(ref_kind)) {
614 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
615 }
616
617 DEBUG_ONLY(int old_vmindex);
618 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
619
620 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
621 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
622 }
623
624 instanceKlassHandle defc;
625 {
626 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
627 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
628 if (!defc_klass->oop_is_instance()) {
629 if (!defc_klass->oop_is_array()) return empty;
630 defc_klass = SystemDictionary::Object_klass();
631 }
632 defc = instanceKlassHandle(THREAD, defc_klass);
633 }
634 if (defc.is_null()) {
635 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
636 }
637 defc->link_class(CHECK_(empty)); // possible safepoint
638
639 // convert the external string name to an internal symbol
640 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
641 if (name == NULL) return empty; // no such name
642 if (name == vmSymbols::class_initializer_name())
643 return empty; // illegal name
644
645 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
646 if ((flags & ALL_KINDS) == IS_METHOD &&
647 (defc() == SystemDictionary::MethodHandle_klass()) &&
648 (ref_kind == JVM_REF_invokeVirtual ||
649 ref_kind == JVM_REF_invokeSpecial ||
650 // static invocation mode is required for _linkToVirtual, etc.:
651 ref_kind == JVM_REF_invokeStatic)) {
652 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
653 if (iid != vmIntrinsics::_none &&
654 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
655 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
656 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
657 mh_invoke_id = iid;
658 }
659 }
660
661 // convert the external string or reflective type to an internal signature
662 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
663 if (type == NULL) return empty; // no such signature exists in the VM
664
665 // Time to do the lookup.
666 switch (flags & ALL_KINDS) {
667 case IS_METHOD:
668 {
669 CallInfo result;
670 {
671 assert(!HAS_PENDING_EXCEPTION, "");
672 if (ref_kind == JVM_REF_invokeStatic) {
673 LinkResolver::resolve_static_call(result,
674 defc, name, type, caller, caller.not_null(), false, THREAD);
675 } else if (ref_kind == JVM_REF_invokeInterface) {
676 LinkResolver::resolve_interface_call(result, Handle(), defc,
677 defc, name, type, caller, caller.not_null(), false, THREAD);
678 } else if (mh_invoke_id != vmIntrinsics::_none) {
679 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
680 LinkResolver::resolve_handle_call(result,
681 defc, name, type, caller, THREAD);
682 } else if (ref_kind == JVM_REF_invokeSpecial) {
683 LinkResolver::resolve_special_call(result,
684 defc, name, type, caller, caller.not_null(), THREAD);
685 } else if (ref_kind == JVM_REF_invokeVirtual) {
686 LinkResolver::resolve_virtual_call(result, Handle(), defc,
687 defc, name, type, caller, caller.not_null(), 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 if (result.resolved_appendix().not_null()) {
696 // The resolved MemberName must not be accompanied by an appendix argument,
697 // since there is no way to bind this value into the MemberName.
698 // Caller is responsible to prevent this from happening.
699 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
700 }
701 oop mname2 = init_method_MemberName(mname, result);
702 return Handle(THREAD, mname2);
703 }
704 case IS_CONSTRUCTOR:
705 {
706 CallInfo result;
707 {
708 assert(!HAS_PENDING_EXCEPTION, "");
709 if (name == vmSymbols::object_initializer_name()) {
710 LinkResolver::resolve_special_call(result,
711 defc, name, type, caller, caller.not_null(), THREAD);
712 } else {
713 break; // will throw after end of switch
714 }
715 if (HAS_PENDING_EXCEPTION) {
716 return empty;
717 }
718 }
719 assert(result.is_statically_bound(), "");
720 oop mname2 = init_method_MemberName(mname, result);
721 return Handle(THREAD, mname2);
722 }
723 case IS_FIELD:
724 {
725 fieldDescriptor result; // find_field initializes fd if found
726 {
727 assert(!HAS_PENDING_EXCEPTION, "");
728 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD);
729 if (HAS_PENDING_EXCEPTION) {
730 return empty;
731 }
732 }
733 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
734 return Handle(THREAD, mname2);
735 }
736 default:
737 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
738 }
739
740 return empty;
741 }
742
743 // Conversely, a member name which is only initialized from JVM internals
744 // may have null defc, name, and type fields.
745 // Resolving it plants a vmtarget/vmindex in it,
746 // which refers directly to JVM internals.
747 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
748 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
749 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
750 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
751 if (vmtarget == NULL) {
752 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
753 }
754
755 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
756 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
757 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
758 int flags = java_lang_invoke_MemberName::flags(mname());
759
760 if (suppress != 0) {
761 if (suppress & _suppress_defc) have_defc = true;
762 if (suppress & _suppress_name) have_name = true;
763 if (suppress & _suppress_type) have_type = true;
764 }
765
766 if (have_defc && have_name && have_type) return; // nothing needed
767
768 switch (flags & ALL_KINDS) {
769 case IS_METHOD:
770 case IS_CONSTRUCTOR:
771 {
772 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
773 methodHandle m(THREAD, (Method*)vmtarget);
774 DEBUG_ONLY(vmtarget = NULL); // safety
775 if (m.is_null()) break;
776 if (!have_defc) {
777 InstanceKlass* defc = m->method_holder();
778 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
779 }
780 if (!have_name) {
781 //not java_lang_String::create_from_symbol; let's intern member names
782 Handle name = StringTable::intern(m->name(), CHECK);
783 java_lang_invoke_MemberName::set_name(mname(), name());
784 }
785 if (!have_type) {
786 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
787 java_lang_invoke_MemberName::set_type(mname(), type());
788 }
789 return;
790 }
791 case IS_FIELD:
792 {
793 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
794 if (!((Klass*) vmtarget)->oop_is_instance()) break;
795 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
796 DEBUG_ONLY(vmtarget = NULL); // safety
797 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
798 fieldDescriptor fd; // find_field initializes fd if found
799 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
800 break; // cannot expand
801 if (!have_defc) {
802 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
803 }
804 if (!have_name) {
805 //not java_lang_String::create_from_symbol; let's intern member names
806 Handle name = StringTable::intern(fd.name(), CHECK);
807 java_lang_invoke_MemberName::set_name(mname(), name());
808 }
809 if (!have_type) {
810 // If it is a primitive field type, don't mess with short strings like "I".
811 Handle type = field_signature_type_or_null(fd.signature());
812 if (type.is_null()) {
813 java_lang_String::create_from_symbol(fd.signature(), CHECK);
814 }
815 java_lang_invoke_MemberName::set_type(mname(), type());
816 }
817 return;
818 }
819 }
820 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
821 }
822
823 int MethodHandles::find_MemberNames(KlassHandle k,
824 Symbol* name, Symbol* sig,
825 int mflags, KlassHandle caller,
826 int skip, objArrayHandle results) {
827 // %%% take caller into account!
828
829 Thread* thread = Thread::current();
830
831 if (k.is_null() || !k->oop_is_instance()) return -1;
832
833 int rfill = 0, rlimit = results->length(), rskip = skip;
834 // overflow measurement:
835 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
836
837 int match_flags = mflags;
838 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
839 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
840 bool local_only = !(search_superc | search_intfc);
841 bool classes_only = false;
842
843 if (name != NULL) {
844 if (name->utf8_length() == 0) return 0; // a match is not possible
845 }
846 if (sig != NULL) {
847 if (sig->utf8_length() == 0) return 0; // a match is not possible
848 if (sig->byte_at(0) == '(')
849 match_flags &= ~(IS_FIELD | IS_TYPE);
850 else
851 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
852 }
853
854 if ((match_flags & IS_TYPE) != 0) {
855 // NYI, and Core Reflection works quite well for this query
856 }
857
858 if ((match_flags & IS_FIELD) != 0) {
859 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
860 if (name != NULL && st.name() != name)
861 continue;
862 if (sig != NULL && st.signature() != sig)
863 continue;
864 // passed the filters
865 if (rskip > 0) {
866 --rskip;
867 } else if (rfill < rlimit) {
868 Handle result(thread, results->obj_at(rfill++));
869 if (!java_lang_invoke_MemberName::is_instance(result()))
870 return -99; // caller bug!
871 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
872 if (saved != result())
873 results->obj_at_put(rfill-1, saved); // show saved instance to user
874 } else if (++overflow >= overflow_limit) {
875 match_flags = 0; break; // got tired of looking at overflow
876 }
877 }
878 }
879
880 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
881 // watch out for these guys:
882 Symbol* init_name = vmSymbols::object_initializer_name();
883 Symbol* clinit_name = vmSymbols::class_initializer_name();
884 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
885 bool negate_name_test = false;
886 // fix name so that it captures the intention of IS_CONSTRUCTOR
887 if (!(match_flags & IS_METHOD)) {
888 // constructors only
889 if (name == NULL) {
890 name = init_name;
891 } else if (name != init_name) {
892 return 0; // no constructors of this method name
893 }
894 } else if (!(match_flags & IS_CONSTRUCTOR)) {
895 // methods only
896 if (name == NULL) {
897 name = init_name;
898 negate_name_test = true; // if we see the name, we *omit* the entry
899 } else if (name == init_name) {
900 return 0; // no methods of this constructor name
901 }
902 } else {
903 // caller will accept either sort; no need to adjust name
904 }
905 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
906 Method* m = st.method();
907 Symbol* m_name = m->name();
908 if (m_name == clinit_name)
909 continue;
910 if (name != NULL && ((m_name != name) ^ negate_name_test))
911 continue;
912 if (sig != NULL && m->signature() != sig)
913 continue;
914 // passed the filters
915 if (rskip > 0) {
916 --rskip;
917 } else if (rfill < rlimit) {
918 Handle result(thread, results->obj_at(rfill++));
919 if (!java_lang_invoke_MemberName::is_instance(result()))
920 return -99; // caller bug!
921 CallInfo info(m);
922 oop saved = MethodHandles::init_method_MemberName(result, info);
923 if (saved != result())
924 results->obj_at_put(rfill-1, saved); // show saved instance to user
925 } else if (++overflow >= overflow_limit) {
926 match_flags = 0; break; // got tired of looking at overflow
927 }
928 }
929 }
930
931 // return number of elements we at leasted wanted to initialize
932 return rfill + overflow;
933 }
934
935 //------------------------------------------------------------------------------
936 // MemberNameTable
937 //
938
939 MemberNameTable::MemberNameTable(int methods_cnt)
940 : GrowableArray<jweak>(methods_cnt, true) {
941 assert_locked_or_safepoint(MemberNameTable_lock);
942 }
943
944 MemberNameTable::~MemberNameTable() {
945 assert_locked_or_safepoint(MemberNameTable_lock);
946 int len = this->length();
947
948 for (int idx = 0; idx < len; idx++) {
949 jweak ref = this->at(idx);
950 JNIHandles::destroy_weak_global(ref);
951 }
952 }
953
954 void MemberNameTable::add_member_name(int index, jweak mem_name_wref) {
955 assert_locked_or_safepoint(MemberNameTable_lock);
956 this->at_put_grow(index, mem_name_wref);
957 }
958
959 // Return a member name oop or NULL.
960 oop MemberNameTable::get_member_name(int index) {
961 assert_locked_or_safepoint(MemberNameTable_lock);
962
963 jweak ref = this->at(index);
964 oop mem_name = JNIHandles::resolve(ref);
965 return mem_name;
966 }
967
968 #if INCLUDE_JVMTI
969 oop MemberNameTable::find_member_name_by_method(Method* old_method) {
970 assert_locked_or_safepoint(MemberNameTable_lock);
971 oop found = NULL;
972 int len = this->length();
973
974 for (int idx = 0; idx < len; idx++) {
975 oop mem_name = JNIHandles::resolve(this->at(idx));
976 if (mem_name == NULL) {
977 continue;
978 }
979 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
980 if (method == old_method) {
981 found = mem_name;
982 break;
983 }
984 }
985 return found;
986 }
987
988 // It is called at safepoint only
989 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
990 int methods_length, bool *trace_name_printed) {
991 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
992 // search the MemberNameTable for uses of either obsolete or EMCP methods
993 for (int j = 0; j < methods_length; j++) {
994 Method* old_method = old_methods[j];
995 Method* new_method = new_methods[j];
996 oop mem_name = find_member_name_by_method(old_method);
997 if (mem_name != NULL) {
998 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method);
999
1000 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1001 if (!(*trace_name_printed)) {
1002 // RC_TRACE_MESG macro has an embedded ResourceMark
1003 RC_TRACE_MESG(("adjust: name=%s",
1004 old_method->method_holder()->external_name()));
1005 *trace_name_printed = true;
1006 }
1007 // RC_TRACE macro has an embedded ResourceMark
1008 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
1009 new_method->name()->as_C_string(),
1010 new_method->signature()->as_C_string()));
1011 }
1012 }
1013 }
1014 }
1015 #endif // INCLUDE_JVMTI
1016
1017 //
1018 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1019 // They are the private interface between this JVM and the HotSpot-specific
1020 // Java code that implements JSR 292 method handles.
1021 //
1022 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1023 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1024 //
1025
1026 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
1027 switch (which) {
1028 case MethodHandles::GC_COUNT_GWT:
1029 #ifdef COMPILER2
1030 return true;
1031 #else
1032 return false;
1033 #endif
1034 }
1035 return 0;
1036 }
1037 JVM_END
1038
1039 #ifndef PRODUCT
1040 #define EACH_NAMED_CON(template, requirement) \
1041 template(MethodHandles,GC_COUNT_GWT) \
1042 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1043 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1044 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1045 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1046 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1047 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1048 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1049 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1050 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1051 template(MethodHandles,GC_LAMBDA_SUPPORT) \
1052 /*end*/
1053
1054 #define IGNORE_REQ(req_expr) /* req_expr */
1055 #define ONE_PLUS(scope,value) 1+
1056 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1057 #define VALUE_COMMA(scope,value) scope::value,
1058 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1059 #define STRING_NULL(scope,value) #value "\0"
1060 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1061
1062 static bool advertise_con_value(int which) {
1063 if (which < 0) return false;
1064 bool ok = true;
1065 int count = 0;
1066 #define INC_COUNT(scope,value) \
1067 ++count;
1068 #define CHECK_REQ(req_expr) \
1069 if (which < count) return ok; \
1070 ok = (req_expr);
1071 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1072 #undef INC_COUNT
1073 #undef CHECK_REQ
1074 assert(count == con_value_count, "");
1075 if (which < count) return ok;
1076 return false;
1077 }
1078
1079 #undef ONE_PLUS
1080 #undef VALUE_COMMA
1081 #undef STRING_NULL
1082 #undef EACH_NAMED_CON
1083 #endif // PRODUCT
1084
1085 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1086 #ifndef PRODUCT
1087 if (advertise_con_value(which)) {
1088 assert(which >= 0 && which < con_value_count, "");
1089 int con = con_values[which];
1090 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1091 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1092 const char* str = &con_names[0];
1093 for (int i = 0; i < which; i++)
1094 str += strlen(str) + 1; // skip name and null
1095 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1096 box->obj_at_put(0, name);
1097 }
1098 return con;
1099 }
1100 #endif
1101 return 0;
1102 }
1103 JVM_END
1104
1105 // void init(MemberName self, AccessibleObject ref)
1106 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1107 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1108 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1109 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1110 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1111 MethodHandles::init_MemberName(mname, target);
1112 }
1113 JVM_END
1114
1115 // void expand(MemberName self)
1116 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1117 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1118 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1119 MethodHandles::expand_MemberName(mname, 0, CHECK);
1120 }
1121 JVM_END
1122
1123 // void resolve(MemberName self, Class<?> caller)
1124 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1125 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1126 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1127
1128 // The trusted Java code that calls this method should already have performed
1129 // access checks on behalf of the given caller. But, we can verify this.
1130 if (VerifyMethodHandles && caller_jh != NULL &&
1131 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1132 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1133 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1134 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1135 }
1136
1137 // Reflection::verify_class_access can only handle instance classes.
1138 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1139 // Emulate LinkResolver::check_klass_accessability.
1140 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1141 if (!Reflection::verify_class_access(caller,
1142 reference_klass,
1143 true)) {
1144 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1145 }
1146 }
1147 }
1148
1149 KlassHandle caller(THREAD,
1150 caller_jh == NULL ? (Klass*) NULL :
1151 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1152 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1153
1154 if (resolved.is_null()) {
1155 int flags = java_lang_invoke_MemberName::flags(mname());
1156 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1157 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1158 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1159 }
1160 if ((flags & ALL_KINDS) == IS_FIELD) {
1161 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1162 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1163 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1164 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1165 } else {
1166 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1167 }
1168 }
1169
1170 return JNIHandles::make_local(THREAD, resolved());
1171 }
1172 JVM_END
1173
1174 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1175 if (mname == NULL ||
1176 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1177 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1178 } else {
1179 int flags = java_lang_invoke_MemberName::flags(mname);
1180 if ((flags & IS_FIELD) != 0 &&
1181 (must_be_static
1182 ? (flags & JVM_ACC_STATIC) != 0
1183 : (flags & JVM_ACC_STATIC) == 0)) {
1184 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1185 return (jlong) vmindex;
1186 }
1187 }
1188 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1189 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1190 return 0;
1191 }
1192
1193 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1194 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1195 }
1196 JVM_END
1197
1198 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1199 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1200 }
1201 JVM_END
1202
1203 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1204 // use the other function to perform sanity checks:
1205 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1206 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1207 return JNIHandles::make_local(THREAD, clazz);
1208 }
1209 JVM_END
1210
1211 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1212 if (mname_jh == NULL) return NULL;
1213 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1214 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1215 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1216 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1217 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1218 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1219 result->obj_at_put(0, x);
1220 x = NULL;
1221 if (vmtarget == NULL) {
1222 x = NULL;
1223 } else if (vmtarget->is_klass()) {
1224 x = ((Klass*) vmtarget)->java_mirror();
1225 } else if (vmtarget->is_method()) {
1226 x = mname();
1227 }
1228 result->obj_at_put(1, x);
1229 return JNIHandles::make_local(env, result());
1230 }
1231 JVM_END
1232
1233
1234
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)));
1242
1243 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1244 if (results.is_null() || !results->is_objArray()) return -1;
1245
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 }
1256
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 }
1263
1264 if (name != NULL && sig != NULL && results.not_null()) {
1265 // try a direct resolve
1266 // %%% TO DO
1267 }
1268
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
1275
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
1287
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
1299
1300 /**
1301 * Throws a java/lang/UnsupportedOperationException unconditionally.
1302 * This is required by the specification of MethodHandle.invoke if
1303 * invoked directly.
1304 */
1305 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1306 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1307 return NULL;
1308 }
1309 JVM_END
1310
1311 /**
1312 * Throws a java/lang/UnsupportedOperationException unconditionally.
1313 * This is required by the specification of MethodHandle.invokeExact if
1314 * invoked directly.
1315 */
1316 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1317 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1318 return NULL;
1319 }
1320 JVM_END
1321
1322 /// JVM_RegisterMethodHandleMethods
1323
1324 #undef CS // Solaris builds complain
1325
1326 #define LANG "Ljava/lang/"
1327 #define JLINV "Ljava/lang/invoke/"
1328
1329 #define OBJ LANG"Object;"
1330 #define CLS LANG"Class;"
1331 #define STRG LANG"String;"
1332 #define CS JLINV"CallSite;"
1333 #define MT JLINV"MethodType;"
1334 #define MH JLINV"MethodHandle;"
1335 #define MEM JLINV"MemberName;"
1336
1337 #define CC (char*) /*cast a literal from (const char*)*/
1338 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1339
1340 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1341 static JNINativeMethod MHN_methods[] = {
1342 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1343 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1344 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1345 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1346 // static native int getNamedCon(int which, Object[] name)
1347 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1348 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1349 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1350 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1351 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1352 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1353 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1354 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1355 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1356 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1357 };
1358
1359 static JNINativeMethod MH_methods[] = {
1360 // UnsupportedOperationException throwers
1361 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1362 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1363 };
1364
1365 /**
1366 * Helper method to register native methods.
1367 */
1368 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1369 int status = env->RegisterNatives(clazz, methods, nMethods);
1370 if (status != JNI_OK || env->ExceptionOccurred()) {
1371 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1372 env->ExceptionClear();
1373 return false;
1374 }
1375 return true;
1376 }
1377
1378 /**
1379 * This one function is exported, used by NativeLookup.
1380 */
1381 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1382 assert(!MethodHandles::enabled(), "must not be enabled");
1383 bool enable_MH = true;
1384
1385 jclass MH_class = NULL;
1386 if (SystemDictionary::MethodHandle_klass() == NULL) {
1387 enable_MH = false;
1388 } else {
1389 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1390 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1391 }
1392
1393 if (enable_MH) {
1394 ThreadToNativeFromVM ttnfv(thread);
1395
1396 if (enable_MH) {
1397 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1398 }
1399 if (enable_MH) {
1400 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1401 }
1402 }
1403
1404 if (TraceInvokeDynamic) {
1405 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1406 }
1407
1408 if (enable_MH) {
1409 if (MethodHandles::generate_adapters() == false) {
1410 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters");
1411 }
1412 MethodHandles::set_enabled(true);
1413 }
1414 }
1415 JVM_END