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/methodHandles.hpp"
33 #include "runtime/compilationPolicy.hpp"
34 #include "runtime/javaCalls.hpp"
35 #include "runtime/reflection.hpp"
36 #include "runtime/signature.hpp"
37 #include "runtime/stubRoutines.hpp"
38 #include "utilities/exceptions.hpp"
39
40
41 /*
42 * JSR 292 reference implementation: method handles
43 * The JDK 7 reference implementation represented method handle
44 * combinations as chains. Each link in the chain had a "vmentry"
45 * field which pointed at a bit of assembly code which performed
46 * one transformation before dispatching to the next link in the chain.
47 *
48 * The current reference implementation pushes almost all code generation
49 * responsibility to (trusted) Java code. A method handle contains a
50 * pointer to its "LambdaForm", which embodies all details of the method
51 * handle's behavior. The LambdaForm is a normal Java object, managed
52 * by a runtime coded in Java.
53 */
54
55 bool MethodHandles::_enabled = false; // set true after successful native linkage
56 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
57
58
59 /**
60 * Generates method handle adapters. Returns 'false' if memory allocation
61 * failed and true otherwise.
62 */
63 bool MethodHandles::generate_adapters() {
64 if (SystemDictionary::MethodHandle_klass() == NULL) {
65 return true;
66 }
67
68 assert(_adapter_code == NULL, "generate only once");
69
70 ResourceMark rm;
71 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
72 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
73 if (_adapter_code == NULL) {
74 return false;
75 }
76
77 CodeBuffer code(_adapter_code);
78 MethodHandlesAdapterGenerator g(&code);
79 g.generate();
80 code.log_section_sizes("MethodHandlesAdapterBlob");
81 return true;
82 }
83
84 //------------------------------------------------------------------------------
85 // MethodHandlesAdapterGenerator::generate
86 //
87 void MethodHandlesAdapterGenerator::generate() {
88 // Generate generic method handle adapters.
89 // Generate interpreter entries
90 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
91 mk <= Interpreter::method_handle_invoke_LAST;
92 mk = Interpreter::MethodKind(1 + (int)mk)) {
93 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
94 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
95 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
96 if (entry != NULL) {
97 Interpreter::set_entry_for_kind(mk, entry);
98 }
99 // If the entry is not set, it will throw AbstractMethodError.
100 }
101 }
102
103 void MethodHandles::set_enabled(bool z) {
104 if (_enabled != z) {
105 guarantee(z, "can only enable once");
106 _enabled = z;
107 }
108 }
109
110 // MemberName support
111
112 // import java_lang_invoke_MemberName.*
113 enum {
114 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
115 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
116 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
117 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
118 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
119 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
120 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
121 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
122 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
123 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
124 };
125
126 Handle MethodHandles::new_MemberName(TRAPS) {
127 Handle empty;
128 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
129 if (!k->is_initialized()) k->initialize(CHECK_(empty));
130 return Handle(THREAD, k->allocate_instance(THREAD));
131 }
132
133 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
134 // This method is used from java.lang.invoke.MemberName constructors.
135 // It fills in the new MemberName from a java.lang.reflect.Member.
136 Thread* thread = Thread::current();
137 oop target_oop = target();
138 Klass* target_klass = target_oop->klass();
139 if (target_klass == SystemDictionary::reflect_Field_klass()) {
140 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
141 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
142 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
143 if (!k.is_null() && k->oop_is_instance()) {
144 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
145 oop mname2 = init_field_MemberName(mname, fd);
146 if (mname2 != NULL) {
147 // Since we have the reified name and type handy, add them to the result.
148 if (java_lang_invoke_MemberName::name(mname2) == NULL)
149 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
150 if (java_lang_invoke_MemberName::type(mname2) == NULL)
151 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
152 }
153 return mname2;
154 }
155 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
156 oop clazz = java_lang_reflect_Method::clazz(target_oop);
157 int slot = java_lang_reflect_Method::slot(target_oop);
158 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
159 if (!k.is_null() && k->oop_is_instance()) {
160 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
161 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
162 return NULL; // do not resolve unless there is a concrete signature
163 CallInfo info(m, k());
164 return init_method_MemberName(mname, info);
165 }
166 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
167 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
168 int slot = java_lang_reflect_Constructor::slot(target_oop);
169 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
170 if (!k.is_null() && k->oop_is_instance()) {
171 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
172 if (m == NULL) return NULL;
173 CallInfo info(m, k());
174 return init_method_MemberName(mname, info);
175 }
176 }
177 return NULL;
178 }
179
180 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
181 assert(info.resolved_appendix().is_null(), "only normal methods here");
182 methodHandle m = info.resolved_method();
183 KlassHandle m_klass = m->method_holder();
184 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
185 int vmindex = Method::invalid_vtable_index;
186
187 switch (info.call_kind()) {
188 case CallInfo::itable_call:
189 vmindex = info.itable_index();
190 // More importantly, the itable index only works with the method holder.
191 assert(m_klass->verify_itable_index(vmindex), "");
192 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
193 if (TraceInvokeDynamic) {
194 ResourceMark rm;
195 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
196 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
197 vmindex);
198 m->access_flags().print_on(tty);
199 if (!m->is_abstract()) {
200 tty->print("default");
201 }
202 tty->cr();
203 }
204 break;
205
206 case CallInfo::vtable_call:
207 vmindex = info.vtable_index();
208 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
209 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
210 if (m_klass->is_interface()) {
211 // This is a vtable call to an interface method (abstract "miranda method" or default method).
212 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
213 // (LinkResolver should help us figure this out.)
214 KlassHandle m_klass_non_interface = info.resolved_klass();
215 if (m_klass_non_interface->is_interface()) {
216 m_klass_non_interface = SystemDictionary::Object_klass();
217 #ifdef ASSERT
218 { ResourceMark rm;
219 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
220 assert(m->name() == m2->name() && m->signature() == m2->signature(),
221 err_msg("at %d, %s != %s", vmindex,
222 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
223 }
224 #endif //ASSERT
225 }
226 if (!m->is_public()) {
227 assert(m->is_public(), "virtual call must be to public interface method");
228 return NULL; // elicit an error later in product build
229 }
230 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
231 m_klass = m_klass_non_interface;
232 }
233 if (TraceInvokeDynamic) {
234 ResourceMark rm;
235 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
236 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
237 m_klass->internal_name(), vmindex);
238 m->access_flags().print_on(tty);
239 if (m->is_default_method()) {
240 tty->print("default");
241 }
242 tty->cr();
243 }
244 break;
245
246 case CallInfo::direct_call:
247 vmindex = Method::nonvirtual_vtable_index;
248 if (m->is_static()) {
249 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
250 } else if (m->is_initializer()) {
251 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
252 } else {
253 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
254 }
255 break;
256
257 default: assert(false, "bad CallInfo"); return NULL;
258 }
259
260 // @CallerSensitive annotation detected
261 if (m->caller_sensitive()) {
262 flags |= CALLER_SENSITIVE;
263 }
264
265 oop mname_oop = mname();
266 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
267 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
268 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
269 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
270 // Note: name and type can be lazily computed by resolve_MemberName,
271 // if Java code needs them as resolved String and MethodType objects.
272 // The clazz must be eagerly stored, because it provides a GC
273 // root to help keep alive the Method*.
274 // If relevant, the vtable or itable value is stored as vmindex.
275 // This is done eagerly, since it is readily available without
276 // constructing any new objects.
277 // TO DO: maybe intern mname_oop
278 if (m->method_holder()->add_member_name(mname)) {
279 return mname();
280 } else {
281 // Redefinition caused this to fail. Return NULL (and an exception?)
282 return NULL;
283 }
284 }
285
286 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
287 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
288 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
289 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
290 Metadata* vmtarget = fd.field_holder();
291 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
292 oop mname_oop = mname();
293 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
294 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
295 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
296 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
297 oop type = field_signature_type_or_null(fd.signature());
298 oop name = field_name_or_null(fd.name());
299 if (name != NULL)
300 java_lang_invoke_MemberName::set_name(mname_oop, name);
301 if (type != NULL)
302 java_lang_invoke_MemberName::set_type(mname_oop, type);
303 // Note: name and type can be lazily computed by resolve_MemberName,
304 // if Java code needs them as resolved String and Class objects.
305 // Note that the incoming type oop might be pre-resolved (non-null).
306 // The base clazz and field offset (vmindex) must be eagerly stored,
307 // because they unambiguously identify the field.
308 // Although the fieldDescriptor::_index would also identify the field,
309 // we do not use it, because it is harder to decode.
310 // TO DO: maybe intern mname_oop
311 return mname();
312 }
313
314 // JVM 2.9 Special Methods:
315 // A method is signature polymorphic if and only if all of the following conditions hold :
316 // * It is declared in the java.lang.invoke.MethodHandle class.
317 // * It has a single formal parameter of type Object[].
318 // * It has a return type of Object.
319 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
320 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
321 if (klass == NULL)
322 return false;
323 // The following test will fail spuriously during bootstrap of MethodHandle itself:
324 // if (klass != SystemDictionary::MethodHandle_klass())
325 // Test the name instead:
326 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
327 return false;
328 Symbol* poly_sig = vmSymbols::object_array_object_signature();
329 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
330 if (m == NULL) return false;
331 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
332 int flags = m->access_flags().as_int();
333 return (flags & required) == required;
334 }
335
336
337 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
338 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
339 switch (iid) {
340 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
341 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
342 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
343 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
344 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
345 }
346 assert(false, "");
347 return 0;
348 }
349
350 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
351 switch (iid) {
352 case vmIntrinsics::_invokeBasic: return 0;
353 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
354 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
355 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
356 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
357 }
358 assert(false, err_msg("iid=%d", iid));
359 return 0;
360 }
361
362 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
363 vmSymbols::SID name_id = vmSymbols::find_sid(name);
364 switch (name_id) {
365 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
366 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
367 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
368 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
369
370 // There is one static signature-polymorphic method for each JVM invocation mode.
371 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
372 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
373 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
374 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
375 }
376
377 // Cover the case of invokeExact and any future variants of invokeFoo.
378 Klass* mh_klass = SystemDictionary::well_known_klass(
379 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
380 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
381 return vmIntrinsics::_invokeGeneric;
382
383 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
384 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
385 return vmIntrinsics::_none;
386 }
387
388 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
389 if (klass != NULL &&
390 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
391 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
392 if (iid != vmIntrinsics::_none)
393 return iid;
394 if (is_method_handle_invoke_name(klass, name))
395 return vmIntrinsics::_invokeGeneric;
396 }
397 return vmIntrinsics::_none;
398 }
399
400
401 // convert the external string or reflective type to an internal signature
402 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
403 if (java_lang_invoke_MethodType::is_instance(type_str)) {
404 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
405 } else if (java_lang_Class::is_instance(type_str)) {
406 return java_lang_Class::as_signature(type_str, false, THREAD);
407 } else if (java_lang_String::is_instance(type_str)) {
408 if (intern_if_not_found) {
409 return java_lang_String::as_symbol(type_str, THREAD);
410 } else {
411 return java_lang_String::as_symbol_or_null(type_str);
412 }
413 } else {
414 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
415 }
416 }
417
418 static const char OBJ_SIG[] = "Ljava/lang/Object;";
419 enum { OBJ_SIG_LEN = 18 };
420
421 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
422 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
423 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
424 const int len = sig->utf8_length();
425 for (int i = 0; i < len; i++) {
426 switch (sig->byte_at(i)) {
427 case 'L':
428 // only java/lang/Object is valid here
429 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
430 return false;
431 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
432 continue;
433 case '(': case ')': case 'V':
434 case 'I': case 'J': case 'F': case 'D':
435 continue;
436 //case '[':
437 //case 'Z': case 'B': case 'C': case 'S':
438 default:
439 return false;
440 }
441 }
442 return true;
443 }
444
445 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
446 Symbol* bsig = NULL;
447 if (sig == NULL) {
448 return sig;
449 } else if (is_basic_type_signature(sig)) {
450 sig->increment_refcount();
451 return sig; // that was easy
452 } else if (sig->byte_at(0) != '(') {
453 BasicType bt = char2type(sig->byte_at(0));
454 if (is_subword_type(bt)) {
455 bsig = vmSymbols::int_signature();
456 } else {
457 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
458 bsig = vmSymbols::object_signature();
459 }
460 } else {
461 ResourceMark rm;
462 stringStream buffer(128);
463 buffer.put('(');
464 int arg_pos = 0, keep_arg_pos = -1;
465 if (keep_last_arg)
466 keep_arg_pos = ArgumentCount(sig).size() - 1;
467 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
468 BasicType bt = ss.type();
469 size_t this_arg_pos = buffer.size();
470 if (ss.at_return_type()) {
471 buffer.put(')');
472 }
473 if (arg_pos == keep_arg_pos) {
474 buffer.write((char*) ss.raw_bytes(),
475 (int) ss.raw_length());
476 } else if (bt == T_OBJECT || bt == T_ARRAY) {
477 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
478 } else {
479 if (is_subword_type(bt))
480 bt = T_INT;
481 buffer.put(type2char(bt));
482 }
483 arg_pos++;
484 }
485 const char* sigstr = buffer.base();
486 int siglen = (int) buffer.size();
487 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
488 }
489 assert(is_basic_type_signature(bsig) ||
490 // detune assert in case the injected argument is not a basic type:
491 keep_last_arg, "");
492 return bsig;
493 }
494
495 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
496 Symbol* sig,
497 bool keep_arrays,
498 bool keep_basic_names) {
499 st = st ? st : tty;
500 int len = sig->utf8_length();
501 int array = 0;
502 bool prev_type = false;
503 for (int i = 0; i < len; i++) {
504 char ch = sig->byte_at(i);
505 switch (ch) {
506 case '(': case ')':
507 prev_type = false;
508 st->put(ch);
509 continue;
510 case '[':
511 if (!keep_basic_names && keep_arrays)
512 st->put(ch);
513 array++;
514 continue;
515 case 'L':
516 {
517 if (prev_type) st->put(',');
518 int start = i+1, slash = start;
519 while (++i < len && (ch = sig->byte_at(i)) != ';') {
520 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
521 }
522 if (slash < i) start = slash;
523 if (!keep_basic_names) {
524 st->put('L');
525 } else {
526 for (int j = start; j < i; j++)
527 st->put(sig->byte_at(j));
528 prev_type = true;
529 }
530 break;
531 }
532 default:
533 {
534 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
535 ch = '[';
536 array = 0;
537 }
538 if (prev_type) st->put(',');
539 const char* n = NULL;
540 if (keep_basic_names)
541 n = type2name(char2type(ch));
542 if (n == NULL) {
543 // unknown letter, or we don't want to know its name
544 st->put(ch);
545 } else {
546 st->print("%s", n);
547 prev_type = true;
548 }
549 break;
550 }
551 }
552 // Switch break goes here to take care of array suffix:
553 if (prev_type) {
554 while (array > 0) {
555 st->print("[]");
556 --array;
557 }
558 }
559 array = 0;
560 }
561 }
562
563
564
565 static oop object_java_mirror() {
566 return SystemDictionary::Object_klass()->java_mirror();
567 }
568
569 oop MethodHandles::field_name_or_null(Symbol* s) {
570 if (s == NULL) return NULL;
571 return StringTable::lookup(s);
572 }
573
574 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
575 if (s == NULL) return NULL;
576 BasicType bt = FieldType::basic_type(s);
577 if (is_java_primitive(bt)) {
578 assert(s->utf8_length() == 1, "");
579 return java_lang_Class::primitive_mirror(bt);
580 }
581 // Here are some more short cuts for common types.
582 // They are optional, since reference types can be resolved lazily.
583 if (bt == T_OBJECT) {
584 if (s == vmSymbols::object_signature()) {
585 return object_java_mirror();
586 } else if (s == vmSymbols::class_signature()) {
587 return SystemDictionary::Class_klass()->java_mirror();
588 } else if (s == vmSymbols::string_signature()) {
589 return SystemDictionary::String_klass()->java_mirror();
590 }
591 }
592 return NULL;
593 }
594
595
596 // An unresolved member name is a mere symbolic reference.
597 // Resolving it plants a vmtarget/vmindex in it,
598 // which refers directly to JVM internals.
599 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
600 Handle empty;
601 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
602
603 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
604 // Already resolved.
605 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
606 assert(vmindex >= Method::nonvirtual_vtable_index, "");
607 return mname;
608 }
609
610 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
611 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
612 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
613 int flags = java_lang_invoke_MemberName::flags(mname());
614 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
615 if (!ref_kind_is_valid(ref_kind)) {
616 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
617 }
618
619 DEBUG_ONLY(int old_vmindex);
620 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
621
622 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
623 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
624 }
625
626 instanceKlassHandle defc;
627 {
628 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
629 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
630 if (!defc_klass->oop_is_instance()) {
631 if (!defc_klass->oop_is_array()) return empty;
632 defc_klass = SystemDictionary::Object_klass();
633 }
634 defc = instanceKlassHandle(THREAD, defc_klass);
635 }
636 if (defc.is_null()) {
637 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
638 }
639 defc->link_class(CHECK_(empty)); // possible safepoint
640
641 // convert the external string name to an internal symbol
642 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
643 if (name == NULL) return empty; // no such name
644 if (name == vmSymbols::class_initializer_name())
645 return empty; // illegal name
646
647 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
648 if ((flags & ALL_KINDS) == IS_METHOD &&
649 (defc() == SystemDictionary::MethodHandle_klass()) &&
650 (ref_kind == JVM_REF_invokeVirtual ||
651 ref_kind == JVM_REF_invokeSpecial ||
652 // static invocation mode is required for _linkToVirtual, etc.:
653 ref_kind == JVM_REF_invokeStatic)) {
654 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
655 if (iid != vmIntrinsics::_none &&
656 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
657 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
658 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
659 mh_invoke_id = iid;
660 }
661 }
662
663 // convert the external string or reflective type to an internal signature
664 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
665 if (type == NULL) return empty; // no such signature exists in the VM
666
667 // Time to do the lookup.
668 switch (flags & ALL_KINDS) {
669 case IS_METHOD:
670 {
671 CallInfo result;
672 {
673 assert(!HAS_PENDING_EXCEPTION, "");
674 if (ref_kind == JVM_REF_invokeStatic) {
675 LinkResolver::resolve_static_call(result,
676 defc, name, type, caller, caller.not_null(), false, THREAD);
677 } else if (ref_kind == JVM_REF_invokeInterface) {
678 LinkResolver::resolve_interface_call(result, Handle(), defc,
679 defc, name, type, caller, caller.not_null(), false, THREAD);
680 } else if (mh_invoke_id != vmIntrinsics::_none) {
681 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
682 LinkResolver::resolve_handle_call(result,
683 defc, name, type, caller, THREAD);
684 } else if (ref_kind == JVM_REF_invokeSpecial) {
685 LinkResolver::resolve_special_call(result,
686 defc, name, type, caller, caller.not_null(), THREAD);
687 } else if (ref_kind == JVM_REF_invokeVirtual) {
688 LinkResolver::resolve_virtual_call(result, Handle(), defc,
689 defc, name, type, caller, caller.not_null(), false, THREAD);
690 } else {
691 assert(false, err_msg("ref_kind=%d", ref_kind));
692 }
693 if (HAS_PENDING_EXCEPTION) {
694 return empty;
695 }
696 }
697 if (result.resolved_appendix().not_null()) {
698 // The resolved MemberName must not be accompanied by an appendix argument,
699 // since there is no way to bind this value into the MemberName.
700 // Caller is responsible to prevent this from happening.
701 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
702 }
703 oop mname2 = init_method_MemberName(mname, result);
704 return Handle(THREAD, mname2);
705 }
706 case IS_CONSTRUCTOR:
707 {
708 CallInfo result;
709 {
710 assert(!HAS_PENDING_EXCEPTION, "");
711 if (name == vmSymbols::object_initializer_name()) {
712 LinkResolver::resolve_special_call(result,
713 defc, name, type, caller, caller.not_null(), THREAD);
714 } else {
715 break; // will throw after end of switch
716 }
717 if (HAS_PENDING_EXCEPTION) {
718 return empty;
719 }
720 }
721 assert(result.is_statically_bound(), "");
722 oop mname2 = init_method_MemberName(mname, result);
723 return Handle(THREAD, mname2);
724 }
725 case IS_FIELD:
726 {
727 fieldDescriptor result; // find_field initializes fd if found
728 {
729 assert(!HAS_PENDING_EXCEPTION, "");
730 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD);
731 if (HAS_PENDING_EXCEPTION) {
732 return empty;
733 }
734 }
735 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
736 return Handle(THREAD, mname2);
737 }
738 default:
739 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
740 }
741
742 return empty;
743 }
744
745 // Conversely, a member name which is only initialized from JVM internals
746 // may have null defc, name, and type fields.
747 // Resolving it plants a vmtarget/vmindex in it,
748 // which refers directly to JVM internals.
749 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
750 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
751 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
752 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
753 if (vmtarget == NULL) {
754 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
755 }
756
757 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
758 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
759 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
760 int flags = java_lang_invoke_MemberName::flags(mname());
761
762 if (suppress != 0) {
763 if (suppress & _suppress_defc) have_defc = true;
764 if (suppress & _suppress_name) have_name = true;
765 if (suppress & _suppress_type) have_type = true;
766 }
767
768 if (have_defc && have_name && have_type) return; // nothing needed
769
770 switch (flags & ALL_KINDS) {
771 case IS_METHOD:
772 case IS_CONSTRUCTOR:
773 {
774 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
775 methodHandle m(THREAD, (Method*)vmtarget);
776 DEBUG_ONLY(vmtarget = NULL); // safety
777 if (m.is_null()) break;
778 if (!have_defc) {
779 InstanceKlass* defc = m->method_holder();
780 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
781 }
782 if (!have_name) {
783 //not java_lang_String::create_from_symbol; let's intern member names
784 Handle name = StringTable::intern(m->name(), CHECK);
785 java_lang_invoke_MemberName::set_name(mname(), name());
786 }
787 if (!have_type) {
788 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
789 java_lang_invoke_MemberName::set_type(mname(), type());
790 }
791 return;
792 }
793 case IS_FIELD:
794 {
795 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
796 if (!((Klass*) vmtarget)->oop_is_instance()) break;
797 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
798 DEBUG_ONLY(vmtarget = NULL); // safety
799 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
800 fieldDescriptor fd; // find_field initializes fd if found
801 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
802 break; // cannot expand
803 if (!have_defc) {
804 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
805 }
806 if (!have_name) {
807 //not java_lang_String::create_from_symbol; let's intern member names
808 Handle name = StringTable::intern(fd.name(), CHECK);
809 java_lang_invoke_MemberName::set_name(mname(), name());
810 }
811 if (!have_type) {
812 // If it is a primitive field type, don't mess with short strings like "I".
813 Handle type = field_signature_type_or_null(fd.signature());
814 if (type.is_null()) {
815 java_lang_String::create_from_symbol(fd.signature(), CHECK);
816 }
817 java_lang_invoke_MemberName::set_type(mname(), type());
818 }
819 return;
820 }
821 }
822 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
823 }
824
825 int MethodHandles::find_MemberNames(KlassHandle k,
826 Symbol* name, Symbol* sig,
827 int mflags, KlassHandle caller,
828 int skip, objArrayHandle results) {
829 // %%% take caller into account!
830
831 Thread* thread = Thread::current();
832
833 if (k.is_null() || !k->oop_is_instance()) return -1;
834
835 int rfill = 0, rlimit = results->length(), rskip = skip;
836 // overflow measurement:
837 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
838
839 int match_flags = mflags;
840 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
841 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
842 bool local_only = !(search_superc | search_intfc);
843 bool classes_only = false;
844
845 if (name != NULL) {
846 if (name->utf8_length() == 0) return 0; // a match is not possible
847 }
848 if (sig != NULL) {
849 if (sig->utf8_length() == 0) return 0; // a match is not possible
850 if (sig->byte_at(0) == '(')
851 match_flags &= ~(IS_FIELD | IS_TYPE);
852 else
853 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
854 }
855
856 if ((match_flags & IS_TYPE) != 0) {
857 // NYI, and Core Reflection works quite well for this query
858 }
859
860 if ((match_flags & IS_FIELD) != 0) {
861 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
862 if (name != NULL && st.name() != name)
863 continue;
864 if (sig != NULL && st.signature() != sig)
865 continue;
866 // passed the filters
867 if (rskip > 0) {
868 --rskip;
869 } else if (rfill < rlimit) {
870 Handle result(thread, results->obj_at(rfill++));
871 if (!java_lang_invoke_MemberName::is_instance(result()))
872 return -99; // caller bug!
873 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
874 if (saved != result())
875 results->obj_at_put(rfill-1, saved); // show saved instance to user
876 } else if (++overflow >= overflow_limit) {
877 match_flags = 0; break; // got tired of looking at overflow
878 }
879 }
880 }
881
882 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
883 // watch out for these guys:
884 Symbol* init_name = vmSymbols::object_initializer_name();
885 Symbol* clinit_name = vmSymbols::class_initializer_name();
886 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
887 bool negate_name_test = false;
888 // fix name so that it captures the intention of IS_CONSTRUCTOR
889 if (!(match_flags & IS_METHOD)) {
890 // constructors only
891 if (name == NULL) {
892 name = init_name;
893 } else if (name != init_name) {
894 return 0; // no constructors of this method name
895 }
896 } else if (!(match_flags & IS_CONSTRUCTOR)) {
897 // methods only
898 if (name == NULL) {
899 name = init_name;
900 negate_name_test = true; // if we see the name, we *omit* the entry
901 } else if (name == init_name) {
902 return 0; // no methods of this constructor name
903 }
904 } else {
905 // caller will accept either sort; no need to adjust name
906 }
907 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
908 Method* m = st.method();
909 Symbol* m_name = m->name();
910 if (m_name == clinit_name)
911 continue;
912 if (name != NULL && ((m_name != name) ^ negate_name_test))
913 continue;
914 if (sig != NULL && m->signature() != sig)
915 continue;
916 // passed the filters
917 if (rskip > 0) {
918 --rskip;
919 } else if (rfill < rlimit) {
920 Handle result(thread, results->obj_at(rfill++));
921 if (!java_lang_invoke_MemberName::is_instance(result()))
922 return -99; // caller bug!
923 CallInfo info(m);
924 oop saved = MethodHandles::init_method_MemberName(result, info);
925 if (saved != result())
926 results->obj_at_put(rfill-1, saved); // show saved instance to user
927 } else if (++overflow >= overflow_limit) {
928 match_flags = 0; break; // got tired of looking at overflow
929 }
930 }
931 }
932
933 // return number of elements we at leasted wanted to initialize
934 return rfill + overflow;
935 }
936
937 //------------------------------------------------------------------------------
938 // MemberNameTable
939 //
940
941 MemberNameTable::MemberNameTable(int methods_cnt)
942 : GrowableArray<jweak>(methods_cnt, true) {
943 assert_locked_or_safepoint(MemberNameTable_lock);
944 }
945
946 MemberNameTable::~MemberNameTable() {
947 assert_locked_or_safepoint(MemberNameTable_lock);
948 int len = this->length();
949
950 for (int idx = 0; idx < len; idx++) {
951 jweak ref = this->at(idx);
952 JNIHandles::destroy_weak_global(ref);
953 }
954 }
955
956 void MemberNameTable::add_member_name(jweak mem_name_wref) {
957 assert_locked_or_safepoint(MemberNameTable_lock);
958 this->push(mem_name_wref);
959 }
960
961 #if INCLUDE_JVMTI
962 // It is called at safepoint only for RedefineClasses
963 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
964 int methods_length, bool *trace_name_printed) {
965 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
966 // For each redefined method
967 for (int j = 0; j < methods_length; j++) {
968 Method* old_method = old_methods[j];
969 Method* new_method = new_methods[j];
970
971 // search the MemberNameTable for uses of either obsolete or EMCP methods
972 for (int idx = 0; idx < length(); idx++) {
973 oop mem_name = JNIHandles::resolve(this->at(idx));
974 if (mem_name != NULL) {
975 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, old_method, new_method,
976 trace_name_printed);
977 }
978 }
979 }
980 }
981 #endif // INCLUDE_JVMTI
982
983 //
984 // Here are the native methods in java.lang.invoke.MethodHandleNatives
985 // They are the private interface between this JVM and the HotSpot-specific
986 // Java code that implements JSR 292 method handles.
987 //
988 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
989 // that intrinsic (non-JNI) native methods are defined in HotSpot.
990 //
991
992 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
993 switch (which) {
994 case MethodHandles::GC_COUNT_GWT:
995 #ifdef COMPILER2
996 return true;
997 #else
998 return false;
999 #endif
1000 }
1001 return 0;
1002 }
1003 JVM_END
1004
1005 #ifndef PRODUCT
1006 #define EACH_NAMED_CON(template, requirement) \
1007 template(MethodHandles,GC_COUNT_GWT) \
1008 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1009 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1010 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1011 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1012 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1013 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1014 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1015 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1016 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1017 template(MethodHandles,GC_LAMBDA_SUPPORT) \
1018 /*end*/
1019
1020 #define IGNORE_REQ(req_expr) /* req_expr */
1021 #define ONE_PLUS(scope,value) 1+
1022 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1023 #define VALUE_COMMA(scope,value) scope::value,
1024 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1025 #define STRING_NULL(scope,value) #value "\0"
1026 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1027
1028 static bool advertise_con_value(int which) {
1029 if (which < 0) return false;
1030 bool ok = true;
1031 int count = 0;
1032 #define INC_COUNT(scope,value) \
1033 ++count;
1034 #define CHECK_REQ(req_expr) \
1035 if (which < count) return ok; \
1036 ok = (req_expr);
1037 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1038 #undef INC_COUNT
1039 #undef CHECK_REQ
1040 assert(count == con_value_count, "");
1041 if (which < count) return ok;
1042 return false;
1043 }
1044
1045 #undef ONE_PLUS
1046 #undef VALUE_COMMA
1047 #undef STRING_NULL
1048 #undef EACH_NAMED_CON
1049 #endif // PRODUCT
1050
1051 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1052 #ifndef PRODUCT
1053 if (advertise_con_value(which)) {
1054 assert(which >= 0 && which < con_value_count, "");
1055 int con = con_values[which];
1056 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1057 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1058 const char* str = &con_names[0];
1059 for (int i = 0; i < which; i++)
1060 str += strlen(str) + 1; // skip name and null
1061 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1062 box->obj_at_put(0, name);
1063 }
1064 return con;
1065 }
1066 #endif
1067 return 0;
1068 }
1069 JVM_END
1070
1071 // void init(MemberName self, AccessibleObject ref)
1072 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1073 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1074 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1075 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1076 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1077 MethodHandles::init_MemberName(mname, target);
1078 }
1079 JVM_END
1080
1081 // void expand(MemberName self)
1082 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1083 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1084 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1085 MethodHandles::expand_MemberName(mname, 0, CHECK);
1086 }
1087 JVM_END
1088
1089 // void resolve(MemberName self, Class<?> caller)
1090 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1091 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1092 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1093
1094 // The trusted Java code that calls this method should already have performed
1095 // access checks on behalf of the given caller. But, we can verify this.
1096 if (VerifyMethodHandles && caller_jh != NULL &&
1097 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1098 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1099 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1100 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1101 }
1102
1103 // Reflection::verify_class_access can only handle instance classes.
1104 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1105 // Emulate LinkResolver::check_klass_accessability.
1106 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1107 if (!Reflection::verify_class_access(caller,
1108 reference_klass,
1109 true)) {
1110 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1111 }
1112 }
1113 }
1114
1115 KlassHandle caller(THREAD,
1116 caller_jh == NULL ? (Klass*) NULL :
1117 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1118 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1119
1120 if (resolved.is_null()) {
1121 int flags = java_lang_invoke_MemberName::flags(mname());
1122 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1123 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1124 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1125 }
1126 if ((flags & ALL_KINDS) == IS_FIELD) {
1127 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1128 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1129 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1130 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1131 } else {
1132 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1133 }
1134 }
1135
1136 return JNIHandles::make_local(THREAD, resolved());
1137 }
1138 JVM_END
1139
1140 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1141 if (mname == NULL ||
1142 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1143 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1144 } else {
1145 int flags = java_lang_invoke_MemberName::flags(mname);
1146 if ((flags & IS_FIELD) != 0 &&
1147 (must_be_static
1148 ? (flags & JVM_ACC_STATIC) != 0
1149 : (flags & JVM_ACC_STATIC) == 0)) {
1150 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1151 return (jlong) vmindex;
1152 }
1153 }
1154 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1155 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1156 return 0;
1157 }
1158
1159 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1160 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1161 }
1162 JVM_END
1163
1164 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1165 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1166 }
1167 JVM_END
1168
1169 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1170 // use the other function to perform sanity checks:
1171 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1172 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1173 return JNIHandles::make_local(THREAD, clazz);
1174 }
1175 JVM_END
1176
1177 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1178 if (mname_jh == NULL) return NULL;
1179 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1180 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1181 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1182 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1183 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1184 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1185 result->obj_at_put(0, x);
1186 x = NULL;
1187 if (vmtarget == NULL) {
1188 x = NULL;
1189 } else if (vmtarget->is_klass()) {
1190 x = ((Klass*) vmtarget)->java_mirror();
1191 } else if (vmtarget->is_method()) {
1192 x = mname();
1193 }
1194 result->obj_at_put(1, x);
1195 return JNIHandles::make_local(env, result());
1196 }
1197 JVM_END
1198
1199
1200
1201 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1202 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1203 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1204 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1205 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1206 if (clazz_jh == NULL || results_jh == NULL) return -1;
1207 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1208
1209 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1210 if (results.is_null() || !results->is_objArray()) return -1;
1211
1212 TempNewSymbol name = NULL;
1213 TempNewSymbol sig = NULL;
1214 if (name_jh != NULL) {
1215 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1216 if (name == NULL) return 0; // a match is not possible
1217 }
1218 if (sig_jh != NULL) {
1219 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1220 if (sig == NULL) return 0; // a match is not possible
1221 }
1222
1223 KlassHandle caller;
1224 if (caller_jh != NULL) {
1225 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1226 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1227 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1228 }
1229
1230 if (name != NULL && sig != NULL && results.not_null()) {
1231 // try a direct resolve
1232 // %%% TO DO
1233 }
1234
1235 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1236 caller, skip, results);
1237 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1238 return res;
1239 }
1240 JVM_END
1241
1242 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1243 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1244 Handle target (THREAD, JNIHandles::resolve(target_jh));
1245 {
1246 // Walk all nmethods depending on this call site.
1247 MutexLocker mu(Compile_lock, thread);
1248 Universe::flush_dependents_on(call_site, target);
1249 java_lang_invoke_CallSite::set_target(call_site(), target());
1250 }
1251 }
1252 JVM_END
1253
1254 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1255 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1256 Handle target (THREAD, JNIHandles::resolve(target_jh));
1257 {
1258 // Walk all nmethods depending on this call site.
1259 MutexLocker mu(Compile_lock, thread);
1260 Universe::flush_dependents_on(call_site, target);
1261 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1262 }
1263 }
1264 JVM_END
1265
1266 /**
1267 * Throws a java/lang/UnsupportedOperationException unconditionally.
1268 * This is required by the specification of MethodHandle.invoke if
1269 * invoked directly.
1270 */
1271 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1272 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1273 return NULL;
1274 }
1275 JVM_END
1276
1277 /**
1278 * Throws a java/lang/UnsupportedOperationException unconditionally.
1279 * This is required by the specification of MethodHandle.invokeExact if
1280 * invoked directly.
1281 */
1282 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1283 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1284 return NULL;
1285 }
1286 JVM_END
1287
1288 /// JVM_RegisterMethodHandleMethods
1289
1290 #undef CS // Solaris builds complain
1291
1292 #define LANG "Ljava/lang/"
1293 #define JLINV "Ljava/lang/invoke/"
1294
1295 #define OBJ LANG"Object;"
1296 #define CLS LANG"Class;"
1297 #define STRG LANG"String;"
1298 #define CS JLINV"CallSite;"
1299 #define MT JLINV"MethodType;"
1300 #define MH JLINV"MethodHandle;"
1301 #define MEM JLINV"MemberName;"
1302
1303 #define CC (char*) /*cast a literal from (const char*)*/
1304 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1305
1306 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1307 static JNINativeMethod MHN_methods[] = {
1308 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1309 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1310 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1311 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1312 // static native int getNamedCon(int which, Object[] name)
1313 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1314 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1315 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1316 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1317 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1318 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1319 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1320 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1321 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1322 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1323 };
1324
1325 static JNINativeMethod MH_methods[] = {
1326 // UnsupportedOperationException throwers
1327 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1328 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1329 };
1330
1331 /**
1332 * Helper method to register native methods.
1333 */
1334 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1335 int status = env->RegisterNatives(clazz, methods, nMethods);
1336 if (status != JNI_OK || env->ExceptionOccurred()) {
1337 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1338 env->ExceptionClear();
1339 return false;
1340 }
1341 return true;
1342 }
1343
1344 /**
1345 * This one function is exported, used by NativeLookup.
1346 */
1347 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1348 assert(!MethodHandles::enabled(), "must not be enabled");
1349 bool enable_MH = true;
1350
1351 jclass MH_class = NULL;
1352 if (SystemDictionary::MethodHandle_klass() == NULL) {
1353 enable_MH = false;
1354 } else {
1355 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1356 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1357 }
1358
1359 if (enable_MH) {
1360 ThreadToNativeFromVM ttnfv(thread);
1361
1362 if (enable_MH) {
1363 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1364 }
1365 if (enable_MH) {
1366 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1367 }
1368 }
1369
1370 if (TraceInvokeDynamic) {
1371 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1372 }
1373
1374 if (enable_MH) {
1375 if (MethodHandles::generate_adapters() == false) {
1376 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters");
1377 }
1378 MethodHandles::set_enabled(true);
1379 }
1380 }
1381 JVM_END