1 /*
2 * Copyright (c) 2008, 2015, 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 "code/codeCache.hpp"
28 #include "compiler/compileBroker.hpp"
29 #include "interpreter/interpreter.hpp"
30 #include "interpreter/oopMapCache.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/oopFactory.hpp"
33 #include "prims/methodHandles.hpp"
34 #include "runtime/compilationPolicy.hpp"
35 #include "runtime/javaCalls.hpp"
36 #include "runtime/reflection.hpp"
37 #include "runtime/signature.hpp"
38 #include "runtime/stubRoutines.hpp"
39 #include "utilities/exceptions.hpp"
40
41
42 /*
43 * JSR 292 reference implementation: method handles
44 * The JDK 7 reference implementation represented method handle
45 * combinations as chains. Each link in the chain had a "vmentry"
46 * field which pointed at a bit of assembly code which performed
47 * one transformation before dispatching to the next link in the chain.
48 *
49 * The current reference implementation pushes almost all code generation
50 * responsibility to (trusted) Java code. A method handle contains a
51 * pointer to its "LambdaForm", which embodies all details of the method
52 * handle's behavior. The LambdaForm is a normal Java object, managed
53 * by a runtime coded in Java.
54 */
55
56 bool MethodHandles::_enabled = false; // set true after successful native linkage
57 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
58
59
60 /**
61 * Generates method handle adapters. Returns 'false' if memory allocation
62 * failed and true otherwise.
63 */
64 bool MethodHandles::generate_adapters() {
65 if (SystemDictionary::MethodHandle_klass() == NULL) {
66 return true;
67 }
68
69 assert(_adapter_code == NULL, "generate only once");
70
71 ResourceMark rm;
72 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
73 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
74 if (_adapter_code == NULL) {
75 return false;
76 }
77
78 CodeBuffer code(_adapter_code);
79 MethodHandlesAdapterGenerator g(&code);
80 g.generate();
81 code.log_section_sizes("MethodHandlesAdapterBlob");
82 return true;
83 }
84
85 //------------------------------------------------------------------------------
86 // MethodHandlesAdapterGenerator::generate
87 //
88 void MethodHandlesAdapterGenerator::generate() {
89 // Generate generic method handle adapters.
90 // Generate interpreter entries
91 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
92 mk <= Interpreter::method_handle_invoke_LAST;
93 mk = Interpreter::MethodKind(1 + (int)mk)) {
94 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
95 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
96 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
97 if (entry != NULL) {
98 Interpreter::set_entry_for_kind(mk, entry);
99 }
100 // If the entry is not set, it will throw AbstractMethodError.
101 }
102 }
103
104 void MethodHandles::set_enabled(bool z) {
105 if (_enabled != z) {
106 guarantee(z, "can only enable once");
107 _enabled = z;
108 }
109 }
110
111 // MemberName support
112
113 // import java_lang_invoke_MemberName.*
114 enum {
115 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
116 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
117 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
118 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
119 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
120 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
121 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
122 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
123 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
124 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
125 };
126
127 Handle MethodHandles::new_MemberName(TRAPS) {
128 Handle empty;
129 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
130 if (!k->is_initialized()) k->initialize(CHECK_(empty));
131 return Handle(THREAD, k->allocate_instance(THREAD));
132 }
133
134 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
135 // This method is used from java.lang.invoke.MemberName constructors.
136 // It fills in the new MemberName from a java.lang.reflect.Member.
137 Thread* thread = Thread::current();
138 oop target_oop = target();
139 Klass* target_klass = target_oop->klass();
140 if (target_klass == SystemDictionary::reflect_Field_klass()) {
141 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
142 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
143 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
144 if (!k.is_null() && k->oop_is_instance()) {
145 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
146 oop mname2 = init_field_MemberName(mname, fd);
147 if (mname2 != NULL) {
148 // Since we have the reified name and type handy, add them to the result.
149 if (java_lang_invoke_MemberName::name(mname2) == NULL)
150 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
151 if (java_lang_invoke_MemberName::type(mname2) == NULL)
152 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
153 }
154 return mname2;
155 }
156 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
157 oop clazz = java_lang_reflect_Method::clazz(target_oop);
158 int slot = java_lang_reflect_Method::slot(target_oop);
159 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
160 if (!k.is_null() && k->oop_is_instance()) {
161 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
162 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
163 return NULL; // do not resolve unless there is a concrete signature
164 CallInfo info(m, k());
165 return init_method_MemberName(mname, info);
166 }
167 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
168 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
169 int slot = java_lang_reflect_Constructor::slot(target_oop);
170 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
171 if (!k.is_null() && k->oop_is_instance()) {
172 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
173 if (m == NULL) return NULL;
174 CallInfo info(m, k());
175 return init_method_MemberName(mname, info);
176 }
177 }
178 return NULL;
179 }
180
181 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
182 assert(info.resolved_appendix().is_null(), "only normal methods here");
183 methodHandle m = info.resolved_method();
184 KlassHandle m_klass = m->method_holder();
185 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
186 int vmindex = Method::invalid_vtable_index;
187
188 switch (info.call_kind()) {
189 case CallInfo::itable_call:
190 vmindex = info.itable_index();
191 // More importantly, the itable index only works with the method holder.
192 assert(m_klass->verify_itable_index(vmindex), "");
193 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
194 if (TraceInvokeDynamic) {
195 ResourceMark rm;
196 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
197 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
198 vmindex);
199 m->access_flags().print_on(tty);
200 if (!m->is_abstract()) {
201 tty->print("default");
202 }
203 tty->cr();
204 }
205 break;
206
207 case CallInfo::vtable_call:
208 vmindex = info.vtable_index();
209 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
210 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
211 if (m_klass->is_interface()) {
212 // This is a vtable call to an interface method (abstract "miranda method" or default method).
213 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
214 // (LinkResolver should help us figure this out.)
215 KlassHandle m_klass_non_interface = info.resolved_klass();
216 if (m_klass_non_interface->is_interface()) {
217 m_klass_non_interface = SystemDictionary::Object_klass();
218 #ifdef ASSERT
219 { ResourceMark rm;
220 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
221 assert(m->name() == m2->name() && m->signature() == m2->signature(),
222 err_msg("at %d, %s != %s", vmindex,
223 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
224 }
225 #endif //ASSERT
226 }
227 if (!m->is_public()) {
228 assert(m->is_public(), "virtual call must be to public interface method");
229 return NULL; // elicit an error later in product build
230 }
231 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
232 m_klass = m_klass_non_interface;
233 }
234 if (TraceInvokeDynamic) {
235 ResourceMark rm;
236 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
237 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
238 m_klass->internal_name(), vmindex);
239 m->access_flags().print_on(tty);
240 if (m->is_default_method()) {
241 tty->print("default");
242 }
243 tty->cr();
244 }
245 break;
246
247 case CallInfo::direct_call:
248 vmindex = Method::nonvirtual_vtable_index;
249 if (m->is_static()) {
250 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
251 } else if (m->is_initializer()) {
252 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
253 } else {
254 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
255 }
256 break;
257
258 default: assert(false, "bad CallInfo"); return NULL;
259 }
260
261 // @CallerSensitive annotation detected
262 if (m->caller_sensitive()) {
263 flags |= CALLER_SENSITIVE;
264 }
265
266 oop mname_oop = mname();
267 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
268 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
269 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
270 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
271 // Note: name and type can be lazily computed by resolve_MemberName,
272 // if Java code needs them as resolved String and MethodType objects.
273 // The clazz must be eagerly stored, because it provides a GC
274 // root to help keep alive the Method*.
275 // If relevant, the vtable or itable value is stored as vmindex.
276 // This is done eagerly, since it is readily available without
277 // constructing any new objects.
278 // TO DO: maybe intern mname_oop
279 if (m->method_holder()->add_member_name(mname)) {
280 return mname();
281 } else {
282 // Redefinition caused this to fail. Return NULL (and an exception?)
283 return NULL;
284 }
285 }
286
287 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
288 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
289 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
290 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
291 Metadata* vmtarget = fd.field_holder();
292 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
293 oop mname_oop = mname();
294 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
295 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
296 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
297 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
298 oop type = field_signature_type_or_null(fd.signature());
299 oop name = field_name_or_null(fd.name());
300 if (name != NULL)
301 java_lang_invoke_MemberName::set_name(mname_oop, name);
302 if (type != NULL)
303 java_lang_invoke_MemberName::set_type(mname_oop, type);
304 // Note: name and type can be lazily computed by resolve_MemberName,
305 // if Java code needs them as resolved String and Class objects.
306 // Note that the incoming type oop might be pre-resolved (non-null).
307 // The base clazz and field offset (vmindex) must be eagerly stored,
308 // because they unambiguously identify the field.
309 // Although the fieldDescriptor::_index would also identify the field,
310 // we do not use it, because it is harder to decode.
311 // TO DO: maybe intern mname_oop
312 return mname();
313 }
314
315 // JVM 2.9 Special Methods:
316 // A method is signature polymorphic if and only if all of the following conditions hold :
317 // * It is declared in the java.lang.invoke.MethodHandle class.
318 // * It has a single formal parameter of type Object[].
319 // * It has a return type of Object.
320 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
321 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
322 if (klass == NULL)
323 return false;
324 // The following test will fail spuriously during bootstrap of MethodHandle itself:
325 // if (klass != SystemDictionary::MethodHandle_klass())
326 // Test the name instead:
327 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
328 return false;
329 Symbol* poly_sig = vmSymbols::object_array_object_signature();
330 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
331 if (m == NULL) return false;
332 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
333 int flags = m->access_flags().as_int();
334 return (flags & required) == required;
335 }
336
337
338 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
339 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
340 switch (iid) {
341 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
342 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
343 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
344 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
345 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
346 }
347 assert(false, "");
348 return 0;
349 }
350
351 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
352 switch (iid) {
353 case vmIntrinsics::_invokeBasic: return 0;
354 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
355 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
356 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
357 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
358 }
359 assert(false, err_msg("iid=%d", iid));
360 return 0;
361 }
362
363 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
364 vmSymbols::SID name_id = vmSymbols::find_sid(name);
365 switch (name_id) {
366 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
367 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
368 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
369 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
370
371 // There is one static signature-polymorphic method for each JVM invocation mode.
372 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
373 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
374 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
375 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
376 }
377
378 // Cover the case of invokeExact and any future variants of invokeFoo.
379 Klass* mh_klass = SystemDictionary::well_known_klass(
380 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
381 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
382 return vmIntrinsics::_invokeGeneric;
383
384 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
385 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
386 return vmIntrinsics::_none;
387 }
388
389 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
390 if (klass != NULL &&
391 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
392 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
393 if (iid != vmIntrinsics::_none)
394 return iid;
395 if (is_method_handle_invoke_name(klass, name))
396 return vmIntrinsics::_invokeGeneric;
397 }
398 return vmIntrinsics::_none;
399 }
400
401
402 // convert the external string or reflective type to an internal signature
403 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
404 if (java_lang_invoke_MethodType::is_instance(type_str)) {
405 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
406 } else if (java_lang_Class::is_instance(type_str)) {
407 return java_lang_Class::as_signature(type_str, false, THREAD);
408 } else if (java_lang_String::is_instance(type_str)) {
409 if (intern_if_not_found) {
410 return java_lang_String::as_symbol(type_str, THREAD);
411 } else {
412 return java_lang_String::as_symbol_or_null(type_str);
413 }
414 } else {
415 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
416 }
417 }
418
419 static const char OBJ_SIG[] = "Ljava/lang/Object;";
420 enum { OBJ_SIG_LEN = 18 };
421
422 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
423 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
424 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
425 const int len = sig->utf8_length();
426 for (int i = 0; i < len; i++) {
427 switch (sig->byte_at(i)) {
428 case 'L':
429 // only java/lang/Object is valid here
430 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
431 return false;
432 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
433 continue;
434 case '(': case ')': case 'V':
435 case 'I': case 'J': case 'F': case 'D':
436 continue;
437 //case '[':
438 //case 'Z': case 'B': case 'C': case 'S':
439 default:
440 return false;
441 }
442 }
443 return true;
444 }
445
446 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
447 Symbol* bsig = NULL;
448 if (sig == NULL) {
449 return sig;
450 } else if (is_basic_type_signature(sig)) {
451 sig->increment_refcount();
452 return sig; // that was easy
453 } else if (sig->byte_at(0) != '(') {
454 BasicType bt = char2type(sig->byte_at(0));
455 if (is_subword_type(bt)) {
456 bsig = vmSymbols::int_signature();
457 } else {
458 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
459 bsig = vmSymbols::object_signature();
460 }
461 } else {
462 ResourceMark rm;
463 stringStream buffer(128);
464 buffer.put('(');
465 int arg_pos = 0, keep_arg_pos = -1;
466 if (keep_last_arg)
467 keep_arg_pos = ArgumentCount(sig).size() - 1;
468 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
469 BasicType bt = ss.type();
470 size_t this_arg_pos = buffer.size();
471 if (ss.at_return_type()) {
472 buffer.put(')');
473 }
474 if (arg_pos == keep_arg_pos) {
475 buffer.write((char*) ss.raw_bytes(),
476 (int) ss.raw_length());
477 } else if (bt == T_OBJECT || bt == T_ARRAY) {
478 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
479 } else {
480 if (is_subword_type(bt))
481 bt = T_INT;
482 buffer.put(type2char(bt));
483 }
484 arg_pos++;
485 }
486 const char* sigstr = buffer.base();
487 int siglen = (int) buffer.size();
488 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
489 }
490 assert(is_basic_type_signature(bsig) ||
491 // detune assert in case the injected argument is not a basic type:
492 keep_last_arg, "");
493 return bsig;
494 }
495
496 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
497 Symbol* sig,
498 bool keep_arrays,
499 bool keep_basic_names) {
500 st = st ? st : tty;
501 int len = sig->utf8_length();
502 int array = 0;
503 bool prev_type = false;
504 for (int i = 0; i < len; i++) {
505 char ch = sig->byte_at(i);
506 switch (ch) {
507 case '(': case ')':
508 prev_type = false;
509 st->put(ch);
510 continue;
511 case '[':
512 if (!keep_basic_names && keep_arrays)
513 st->put(ch);
514 array++;
515 continue;
516 case 'L':
517 {
518 if (prev_type) st->put(',');
519 int start = i+1, slash = start;
520 while (++i < len && (ch = sig->byte_at(i)) != ';') {
521 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
522 }
523 if (slash < i) start = slash;
524 if (!keep_basic_names) {
525 st->put('L');
526 } else {
527 for (int j = start; j < i; j++)
528 st->put(sig->byte_at(j));
529 prev_type = true;
530 }
531 break;
532 }
533 default:
534 {
535 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
536 ch = '[';
537 array = 0;
538 }
539 if (prev_type) st->put(',');
540 const char* n = NULL;
541 if (keep_basic_names)
542 n = type2name(char2type(ch));
543 if (n == NULL) {
544 // unknown letter, or we don't want to know its name
545 st->put(ch);
546 } else {
547 st->print("%s", n);
548 prev_type = true;
549 }
550 break;
551 }
552 }
553 // Switch break goes here to take care of array suffix:
554 if (prev_type) {
555 while (array > 0) {
556 st->print("[]");
557 --array;
558 }
559 }
560 array = 0;
561 }
562 }
563
564
565
566 static oop object_java_mirror() {
567 return SystemDictionary::Object_klass()->java_mirror();
568 }
569
570 oop MethodHandles::field_name_or_null(Symbol* s) {
571 if (s == NULL) return NULL;
572 return StringTable::lookup(s);
573 }
574
575 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
576 if (s == NULL) return NULL;
577 BasicType bt = FieldType::basic_type(s);
578 if (is_java_primitive(bt)) {
579 assert(s->utf8_length() == 1, "");
580 return java_lang_Class::primitive_mirror(bt);
581 }
582 // Here are some more short cuts for common types.
583 // They are optional, since reference types can be resolved lazily.
584 if (bt == T_OBJECT) {
585 if (s == vmSymbols::object_signature()) {
586 return object_java_mirror();
587 } else if (s == vmSymbols::class_signature()) {
588 return SystemDictionary::Class_klass()->java_mirror();
589 } else if (s == vmSymbols::string_signature()) {
590 return SystemDictionary::String_klass()->java_mirror();
591 }
592 }
593 return NULL;
594 }
595
596
597 // An unresolved member name is a mere symbolic reference.
598 // Resolving it plants a vmtarget/vmindex in it,
599 // which refers directly to JVM internals.
600 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
601 Handle empty;
602 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
603
604 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
605 // Already resolved.
606 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
607 assert(vmindex >= Method::nonvirtual_vtable_index, "");
608 return mname;
609 }
610
611 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
612 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
613 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
614 int flags = java_lang_invoke_MemberName::flags(mname());
615 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
616 if (!ref_kind_is_valid(ref_kind)) {
617 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
618 }
619
620 DEBUG_ONLY(int old_vmindex);
621 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
622
623 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
624 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
625 }
626
627 instanceKlassHandle defc;
628 {
629 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
630 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
631 if (!defc_klass->oop_is_instance()) {
632 if (!defc_klass->oop_is_array()) return empty;
633 defc_klass = SystemDictionary::Object_klass();
634 }
635 defc = instanceKlassHandle(THREAD, defc_klass);
636 }
637 if (defc.is_null()) {
638 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
639 }
640 defc->link_class(CHECK_(empty)); // possible safepoint
641
642 // convert the external string name to an internal symbol
643 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
644 if (name == NULL) return empty; // no such name
645 if (name == vmSymbols::class_initializer_name())
646 return empty; // illegal name
647
648 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
649 if ((flags & ALL_KINDS) == IS_METHOD &&
650 (defc() == SystemDictionary::MethodHandle_klass()) &&
651 (ref_kind == JVM_REF_invokeVirtual ||
652 ref_kind == JVM_REF_invokeSpecial ||
653 // static invocation mode is required for _linkToVirtual, etc.:
654 ref_kind == JVM_REF_invokeStatic)) {
655 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
656 if (iid != vmIntrinsics::_none &&
657 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
658 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
659 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
660 mh_invoke_id = iid;
661 }
662 }
663
664 // convert the external string or reflective type to an internal signature
665 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
666 if (type == NULL) return empty; // no such signature exists in the VM
667
668 // Time to do the lookup.
669 switch (flags & ALL_KINDS) {
670 case IS_METHOD:
671 {
672 CallInfo result;
673 {
674 assert(!HAS_PENDING_EXCEPTION, "");
675 if (ref_kind == JVM_REF_invokeStatic) {
676 LinkResolver::resolve_static_call(result,
677 defc, name, type, caller, caller.not_null(), false, THREAD);
678 } else if (ref_kind == JVM_REF_invokeInterface) {
679 LinkResolver::resolve_interface_call(result, Handle(), defc,
680 defc, name, type, caller, caller.not_null(), false, THREAD);
681 } else if (mh_invoke_id != vmIntrinsics::_none) {
682 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
683 LinkResolver::resolve_handle_call(result,
684 defc, name, type, caller, THREAD);
685 } else if (ref_kind == JVM_REF_invokeSpecial) {
686 LinkResolver::resolve_special_call(result,
687 defc, name, type, caller, caller.not_null(), THREAD);
688 } else if (ref_kind == JVM_REF_invokeVirtual) {
689 LinkResolver::resolve_virtual_call(result, Handle(), defc,
690 defc, name, type, caller, caller.not_null(), false, THREAD);
691 } else {
692 assert(false, err_msg("ref_kind=%d", ref_kind));
693 }
694 if (HAS_PENDING_EXCEPTION) {
695 return empty;
696 }
697 }
698 if (result.resolved_appendix().not_null()) {
699 // The resolved MemberName must not be accompanied by an appendix argument,
700 // since there is no way to bind this value into the MemberName.
701 // Caller is responsible to prevent this from happening.
702 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
703 }
704 oop mname2 = init_method_MemberName(mname, result);
705 return Handle(THREAD, mname2);
706 }
707 case IS_CONSTRUCTOR:
708 {
709 CallInfo result;
710 {
711 assert(!HAS_PENDING_EXCEPTION, "");
712 if (name == vmSymbols::object_initializer_name()) {
713 LinkResolver::resolve_special_call(result,
714 defc, name, type, caller, caller.not_null(), THREAD);
715 } else {
716 break; // will throw after end of switch
717 }
718 if (HAS_PENDING_EXCEPTION) {
719 return empty;
720 }
721 }
722 assert(result.is_statically_bound(), "");
723 oop mname2 = init_method_MemberName(mname, result);
724 return Handle(THREAD, mname2);
725 }
726 case IS_FIELD:
727 {
728 fieldDescriptor result; // find_field initializes fd if found
729 {
730 assert(!HAS_PENDING_EXCEPTION, "");
731 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD);
732 if (HAS_PENDING_EXCEPTION) {
733 return empty;
734 }
735 }
736 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
737 return Handle(THREAD, mname2);
738 }
739 default:
740 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
741 }
742
743 return empty;
744 }
745
746 // Conversely, a member name which is only initialized from JVM internals
747 // may have null defc, name, and type fields.
748 // Resolving it plants a vmtarget/vmindex in it,
749 // which refers directly to JVM internals.
750 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
751 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
752 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
753 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
754 if (vmtarget == NULL) {
755 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
756 }
757
758 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
759 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
760 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
761 int flags = java_lang_invoke_MemberName::flags(mname());
762
763 if (suppress != 0) {
764 if (suppress & _suppress_defc) have_defc = true;
765 if (suppress & _suppress_name) have_name = true;
766 if (suppress & _suppress_type) have_type = true;
767 }
768
769 if (have_defc && have_name && have_type) return; // nothing needed
770
771 switch (flags & ALL_KINDS) {
772 case IS_METHOD:
773 case IS_CONSTRUCTOR:
774 {
775 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
776 methodHandle m(THREAD, (Method*)vmtarget);
777 DEBUG_ONLY(vmtarget = NULL); // safety
778 if (m.is_null()) break;
779 if (!have_defc) {
780 InstanceKlass* defc = m->method_holder();
781 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
782 }
783 if (!have_name) {
784 //not java_lang_String::create_from_symbol; let's intern member names
785 Handle name = StringTable::intern(m->name(), CHECK);
786 java_lang_invoke_MemberName::set_name(mname(), name());
787 }
788 if (!have_type) {
789 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
790 java_lang_invoke_MemberName::set_type(mname(), type());
791 }
792 return;
793 }
794 case IS_FIELD:
795 {
796 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
797 if (!((Klass*) vmtarget)->oop_is_instance()) break;
798 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
799 DEBUG_ONLY(vmtarget = NULL); // safety
800 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
801 fieldDescriptor fd; // find_field initializes fd if found
802 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
803 break; // cannot expand
804 if (!have_defc) {
805 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
806 }
807 if (!have_name) {
808 //not java_lang_String::create_from_symbol; let's intern member names
809 Handle name = StringTable::intern(fd.name(), CHECK);
810 java_lang_invoke_MemberName::set_name(mname(), name());
811 }
812 if (!have_type) {
813 // If it is a primitive field type, don't mess with short strings like "I".
814 Handle type = field_signature_type_or_null(fd.signature());
815 if (type.is_null()) {
816 java_lang_String::create_from_symbol(fd.signature(), CHECK);
817 }
818 java_lang_invoke_MemberName::set_type(mname(), type());
819 }
820 return;
821 }
822 }
823 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
824 }
825
826 int MethodHandles::find_MemberNames(KlassHandle k,
827 Symbol* name, Symbol* sig,
828 int mflags, KlassHandle caller,
829 int skip, objArrayHandle results) {
830 // %%% take caller into account!
831
832 Thread* thread = Thread::current();
833
834 if (k.is_null() || !k->oop_is_instance()) return -1;
835
836 int rfill = 0, rlimit = results->length(), rskip = skip;
837 // overflow measurement:
838 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
839
840 int match_flags = mflags;
841 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
842 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
843 bool local_only = !(search_superc | search_intfc);
844 bool classes_only = false;
845
846 if (name != NULL) {
847 if (name->utf8_length() == 0) return 0; // a match is not possible
848 }
849 if (sig != NULL) {
850 if (sig->utf8_length() == 0) return 0; // a match is not possible
851 if (sig->byte_at(0) == '(')
852 match_flags &= ~(IS_FIELD | IS_TYPE);
853 else
854 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
855 }
856
857 if ((match_flags & IS_TYPE) != 0) {
858 // NYI, and Core Reflection works quite well for this query
859 }
860
861 if ((match_flags & IS_FIELD) != 0) {
862 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
863 if (name != NULL && st.name() != name)
864 continue;
865 if (sig != NULL && st.signature() != sig)
866 continue;
867 // passed the filters
868 if (rskip > 0) {
869 --rskip;
870 } else if (rfill < rlimit) {
871 Handle result(thread, results->obj_at(rfill++));
872 if (!java_lang_invoke_MemberName::is_instance(result()))
873 return -99; // caller bug!
874 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
875 if (saved != result())
876 results->obj_at_put(rfill-1, saved); // show saved instance to user
877 } else if (++overflow >= overflow_limit) {
878 match_flags = 0; break; // got tired of looking at overflow
879 }
880 }
881 }
882
883 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
884 // watch out for these guys:
885 Symbol* init_name = vmSymbols::object_initializer_name();
886 Symbol* clinit_name = vmSymbols::class_initializer_name();
887 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
888 bool negate_name_test = false;
889 // fix name so that it captures the intention of IS_CONSTRUCTOR
890 if (!(match_flags & IS_METHOD)) {
891 // constructors only
892 if (name == NULL) {
893 name = init_name;
894 } else if (name != init_name) {
895 return 0; // no constructors of this method name
896 }
897 } else if (!(match_flags & IS_CONSTRUCTOR)) {
898 // methods only
899 if (name == NULL) {
900 name = init_name;
901 negate_name_test = true; // if we see the name, we *omit* the entry
902 } else if (name == init_name) {
903 return 0; // no methods of this constructor name
904 }
905 } else {
906 // caller will accept either sort; no need to adjust name
907 }
908 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
909 Method* m = st.method();
910 Symbol* m_name = m->name();
911 if (m_name == clinit_name)
912 continue;
913 if (name != NULL && ((m_name != name) ^ negate_name_test))
914 continue;
915 if (sig != NULL && m->signature() != sig)
916 continue;
917 // passed the filters
918 if (rskip > 0) {
919 --rskip;
920 } else if (rfill < rlimit) {
921 Handle result(thread, results->obj_at(rfill++));
922 if (!java_lang_invoke_MemberName::is_instance(result()))
923 return -99; // caller bug!
924 CallInfo info(m);
925 oop saved = MethodHandles::init_method_MemberName(result, info);
926 if (saved != result())
927 results->obj_at_put(rfill-1, saved); // show saved instance to user
928 } else if (++overflow >= overflow_limit) {
929 match_flags = 0; break; // got tired of looking at overflow
930 }
931 }
932 }
933
934 // return number of elements we at leasted wanted to initialize
935 return rfill + overflow;
936 }
937
938 //------------------------------------------------------------------------------
939 // MemberNameTable
940 //
941
942 MemberNameTable::MemberNameTable(int methods_cnt)
943 : GrowableArray<jweak>(methods_cnt, true) {
944 assert_locked_or_safepoint(MemberNameTable_lock);
945 }
946
947 MemberNameTable::~MemberNameTable() {
948 assert_locked_or_safepoint(MemberNameTable_lock);
949 int len = this->length();
950
951 for (int idx = 0; idx < len; idx++) {
952 jweak ref = this->at(idx);
953 JNIHandles::destroy_weak_global(ref);
954 }
955 }
956
957 void MemberNameTable::add_member_name(jweak mem_name_wref) {
958 assert_locked_or_safepoint(MemberNameTable_lock);
959 this->push(mem_name_wref);
960 }
961
962 #if INCLUDE_JVMTI
963 // It is called at safepoint only for RedefineClasses
964 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
965 int methods_length, bool *trace_name_printed) {
966 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
967 // For each redefined method
968 for (int j = 0; j < methods_length; j++) {
969 Method* old_method = old_methods[j];
970 Method* new_method = new_methods[j];
971
972 // search the MemberNameTable for uses of either obsolete or EMCP methods
973 for (int idx = 0; idx < length(); idx++) {
974 oop mem_name = JNIHandles::resolve(this->at(idx));
975 if (mem_name != NULL) {
976 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, old_method, new_method,
977 trace_name_printed);
978 }
979 }
980 }
981 }
982 #endif // INCLUDE_JVMTI
983
984 //
985 // Here are the native methods in java.lang.invoke.MethodHandleNatives
986 // They are the private interface between this JVM and the HotSpot-specific
987 // Java code that implements JSR 292 method handles.
988 //
989 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
990 // that intrinsic (non-JNI) native methods are defined in HotSpot.
991 //
992
993 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
994 switch (which) {
995 case MethodHandles::GC_COUNT_GWT:
996 #ifdef COMPILER2
997 return true;
998 #else
999 return false;
1000 #endif
1001 }
1002 return 0;
1003 }
1004 JVM_END
1005
1006 #ifndef PRODUCT
1007 #define EACH_NAMED_CON(template, requirement) \
1008 template(MethodHandles,GC_COUNT_GWT) \
1009 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1010 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1011 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1012 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1013 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1014 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1015 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1016 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1017 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1018 template(MethodHandles,GC_LAMBDA_SUPPORT) \
1019 /*end*/
1020
1021 #define IGNORE_REQ(req_expr) /* req_expr */
1022 #define ONE_PLUS(scope,value) 1+
1023 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1024 #define VALUE_COMMA(scope,value) scope::value,
1025 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1026 #define STRING_NULL(scope,value) #value "\0"
1027 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1028
1029 static bool advertise_con_value(int which) {
1030 if (which < 0) return false;
1031 bool ok = true;
1032 int count = 0;
1033 #define INC_COUNT(scope,value) \
1034 ++count;
1035 #define CHECK_REQ(req_expr) \
1036 if (which < count) return ok; \
1037 ok = (req_expr);
1038 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1039 #undef INC_COUNT
1040 #undef CHECK_REQ
1041 assert(count == con_value_count, "");
1042 if (which < count) return ok;
1043 return false;
1044 }
1045
1046 #undef ONE_PLUS
1047 #undef VALUE_COMMA
1048 #undef STRING_NULL
1049 #undef EACH_NAMED_CON
1050 #endif // PRODUCT
1051
1052 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1053 #ifndef PRODUCT
1054 if (advertise_con_value(which)) {
1055 assert(which >= 0 && which < con_value_count, "");
1056 int con = con_values[which];
1057 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1058 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1059 const char* str = &con_names[0];
1060 for (int i = 0; i < which; i++)
1061 str += strlen(str) + 1; // skip name and null
1062 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1063 box->obj_at_put(0, name);
1064 }
1065 return con;
1066 }
1067 #endif
1068 return 0;
1069 }
1070 JVM_END
1071
1072 // void init(MemberName self, AccessibleObject ref)
1073 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1074 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1075 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1076 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1077 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1078 MethodHandles::init_MemberName(mname, target);
1079 }
1080 JVM_END
1081
1082 // void expand(MemberName self)
1083 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1084 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1085 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1086 MethodHandles::expand_MemberName(mname, 0, CHECK);
1087 }
1088 JVM_END
1089
1090 // void resolve(MemberName self, Class<?> caller)
1091 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1092 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1093 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1094
1095 // The trusted Java code that calls this method should already have performed
1096 // access checks on behalf of the given caller. But, we can verify this.
1097 if (VerifyMethodHandles && caller_jh != NULL &&
1098 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1099 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1100 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1101 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1102 }
1103
1104 // Reflection::verify_class_access can only handle instance classes.
1105 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1106 // Emulate LinkResolver::check_klass_accessability.
1107 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1108 if (!Reflection::verify_class_access(caller,
1109 reference_klass,
1110 true)) {
1111 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1112 }
1113 }
1114 }
1115
1116 KlassHandle caller(THREAD,
1117 caller_jh == NULL ? (Klass*) NULL :
1118 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1119 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1120
1121 if (resolved.is_null()) {
1122 int flags = java_lang_invoke_MemberName::flags(mname());
1123 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1124 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1125 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1126 }
1127 if ((flags & ALL_KINDS) == IS_FIELD) {
1128 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1129 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1130 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1131 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1132 } else {
1133 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1134 }
1135 }
1136
1137 return JNIHandles::make_local(THREAD, resolved());
1138 }
1139 JVM_END
1140
1141 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1142 if (mname == NULL ||
1143 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1144 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1145 } else {
1146 int flags = java_lang_invoke_MemberName::flags(mname);
1147 if ((flags & IS_FIELD) != 0 &&
1148 (must_be_static
1149 ? (flags & JVM_ACC_STATIC) != 0
1150 : (flags & JVM_ACC_STATIC) == 0)) {
1151 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1152 return (jlong) vmindex;
1153 }
1154 }
1155 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1156 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1157 return 0;
1158 }
1159
1160 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1161 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1162 }
1163 JVM_END
1164
1165 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1166 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1167 }
1168 JVM_END
1169
1170 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1171 // use the other function to perform sanity checks:
1172 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1173 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1174 return JNIHandles::make_local(THREAD, clazz);
1175 }
1176 JVM_END
1177
1178 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1179 if (mname_jh == NULL) return NULL;
1180 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1181 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1182 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1183 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1184 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1185 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1186 result->obj_at_put(0, x);
1187 x = NULL;
1188 if (vmtarget == NULL) {
1189 x = NULL;
1190 } else if (vmtarget->is_klass()) {
1191 x = ((Klass*) vmtarget)->java_mirror();
1192 } else if (vmtarget->is_method()) {
1193 x = mname();
1194 }
1195 result->obj_at_put(1, x);
1196 return JNIHandles::make_local(env, result());
1197 }
1198 JVM_END
1199
1200
1201
1202 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1203 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1204 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1205 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1206 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1207 if (clazz_jh == NULL || results_jh == NULL) return -1;
1208 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1209
1210 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1211 if (results.is_null() || !results->is_objArray()) return -1;
1212
1213 TempNewSymbol name = NULL;
1214 TempNewSymbol sig = NULL;
1215 if (name_jh != NULL) {
1216 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1217 if (name == NULL) return 0; // a match is not possible
1218 }
1219 if (sig_jh != NULL) {
1220 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1221 if (sig == NULL) return 0; // a match is not possible
1222 }
1223
1224 KlassHandle caller;
1225 if (caller_jh != NULL) {
1226 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1227 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1228 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1229 }
1230
1231 if (name != NULL && sig != NULL && results.not_null()) {
1232 // try a direct resolve
1233 // %%% TO DO
1234 }
1235
1236 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1237 caller, skip, results);
1238 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1239 return res;
1240 }
1241 JVM_END
1242
1243 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1244 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1245 Handle target (THREAD, JNIHandles::resolve(target_jh));
1246 {
1247 // Walk all nmethods depending on this call site.
1248 MutexLocker mu(Compile_lock, thread);
1249 CodeCache::flush_dependents_on(call_site, target);
1250 java_lang_invoke_CallSite::set_target(call_site(), target());
1251 }
1252 }
1253 JVM_END
1254
1255 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1256 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1257 Handle target (THREAD, JNIHandles::resolve(target_jh));
1258 {
1259 // Walk all nmethods depending on this call site.
1260 MutexLocker mu(Compile_lock, thread);
1261 CodeCache::flush_dependents_on(call_site, target);
1262 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1263 }
1264 }
1265 JVM_END
1266
1267 /**
1268 * Throws a java/lang/UnsupportedOperationException unconditionally.
1269 * This is required by the specification of MethodHandle.invoke if
1270 * invoked directly.
1271 */
1272 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1273 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1274 return NULL;
1275 }
1276 JVM_END
1277
1278 /**
1279 * Throws a java/lang/UnsupportedOperationException unconditionally.
1280 * This is required by the specification of MethodHandle.invokeExact if
1281 * invoked directly.
1282 */
1283 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1284 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1285 return NULL;
1286 }
1287 JVM_END
1288
1289 /// JVM_RegisterMethodHandleMethods
1290
1291 #undef CS // Solaris builds complain
1292
1293 #define LANG "Ljava/lang/"
1294 #define JLINV "Ljava/lang/invoke/"
1295
1296 #define OBJ LANG"Object;"
1297 #define CLS LANG"Class;"
1298 #define STRG LANG"String;"
1299 #define CS JLINV"CallSite;"
1300 #define MT JLINV"MethodType;"
1301 #define MH JLINV"MethodHandle;"
1302 #define MEM JLINV"MemberName;"
1303
1304 #define CC (char*) /*cast a literal from (const char*)*/
1305 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1306
1307 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1308 static JNINativeMethod MHN_methods[] = {
1309 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1310 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1311 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1312 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1313 // static native int getNamedCon(int which, Object[] name)
1314 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1315 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1316 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1317 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1318 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1319 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1320 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1321 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1322 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1323 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1324 };
1325
1326 static JNINativeMethod MH_methods[] = {
1327 // UnsupportedOperationException throwers
1328 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1329 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1330 };
1331
1332 /**
1333 * Helper method to register native methods.
1334 */
1335 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1336 int status = env->RegisterNatives(clazz, methods, nMethods);
1337 if (status != JNI_OK || env->ExceptionOccurred()) {
1338 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1339 env->ExceptionClear();
1340 return false;
1341 }
1342 return true;
1343 }
1344
1345 /**
1346 * This one function is exported, used by NativeLookup.
1347 */
1348 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1349 assert(!MethodHandles::enabled(), "must not be enabled");
1350 bool enable_MH = true;
1351
1352 jclass MH_class = NULL;
1353 if (SystemDictionary::MethodHandle_klass() == NULL) {
1354 enable_MH = false;
1355 } else {
1356 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1357 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1358 }
1359
1360 if (enable_MH) {
1361 ThreadToNativeFromVM ttnfv(thread);
1362
1363 if (enable_MH) {
1364 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1365 }
1366 if (enable_MH) {
1367 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1368 }
1369 }
1370
1371 if (TraceInvokeDynamic) {
1372 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1373 }
1374
1375 if (enable_MH) {
1376 if (MethodHandles::generate_adapters() == false) {
1377 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters");
1378 }
1379 MethodHandles::set_enabled(true);
1380 }
1381 }
1382 JVM_END