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