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/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "code/codeCache.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "interpreter/interpreter.hpp"
31 #include "interpreter/oopMapCache.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/allocation.inline.hpp"
34 #include "memory/oopFactory.hpp"
35 #include "oops/objArrayOop.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/methodHandles.hpp"
38 #include "runtime/compilationPolicy.hpp"
39 #include "runtime/javaCalls.hpp"
40 #include "runtime/reflection.hpp"
41 #include "runtime/signature.hpp"
42 #include "runtime/stubRoutines.hpp"
43 #include "utilities/exceptions.hpp"
44
45
46 /*
47 * JSR 292 reference implementation: method handles
48 * The JDK 7 reference implementation represented method handle
49 * combinations as chains. Each link in the chain had a "vmentry"
50 * field which pointed at a bit of assembly code which performed
51 * one transformation before dispatching to the next link in the chain.
52 *
53 * The current reference implementation pushes almost all code generation
54 * responsibility to (trusted) Java code. A method handle contains a
55 * pointer to its "LambdaForm", which embodies all details of the method
56 * handle's behavior. The LambdaForm is a normal Java object, managed
57 * by a runtime coded in Java.
58 */
59
60 bool MethodHandles::_enabled = false; // set true after successful native linkage
61 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
62
63
64 /**
65 * Generates method handle adapters. Returns 'false' if memory allocation
66 * failed and true otherwise.
67 */
68 bool MethodHandles::generate_adapters() {
69 if (SystemDictionary::MethodHandle_klass() == NULL) {
70 return true;
71 }
72
73 assert(_adapter_code == NULL, "generate only once");
74
75 ResourceMark rm;
76 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
77 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
78 if (_adapter_code == NULL) {
79 return false;
80 }
81
82 CodeBuffer code(_adapter_code);
83 MethodHandlesAdapterGenerator g(&code);
84 g.generate();
85 code.log_section_sizes("MethodHandlesAdapterBlob");
86 return true;
87 }
88
89 //------------------------------------------------------------------------------
90 // MethodHandlesAdapterGenerator::generate
91 //
92 void MethodHandlesAdapterGenerator::generate() {
93 // Generate generic method handle adapters.
94 // Generate interpreter entries
95 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
96 mk <= Interpreter::method_handle_invoke_LAST;
97 mk = Interpreter::MethodKind(1 + (int)mk)) {
98 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
99 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
100 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
101 if (entry != NULL) {
102 Interpreter::set_entry_for_kind(mk, entry);
103 }
104 // If the entry is not set, it will throw AbstractMethodError.
105 }
106 }
107
108 void MethodHandles::set_enabled(bool z) {
109 if (_enabled != z) {
110 guarantee(z, "can only enable once");
111 _enabled = z;
112 }
113 }
114
115 // MemberName support
116
117 // import java_lang_invoke_MemberName.*
118 enum {
119 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
120 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
121 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
122 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
123 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
124 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
125 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
126 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
127 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
128 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
129 };
130
131 Handle MethodHandles::new_MemberName(TRAPS) {
132 Handle empty;
133 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
134 if (!k->is_initialized()) k->initialize(CHECK_(empty));
135 return Handle(THREAD, k->allocate_instance(THREAD));
136 }
137
138 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
139 // This method is used from java.lang.invoke.MemberName constructors.
140 // It fills in the new MemberName from a java.lang.reflect.Member.
141 Thread* thread = Thread::current();
142 oop target_oop = target();
143 Klass* target_klass = target_oop->klass();
144 if (target_klass == SystemDictionary::reflect_Field_klass()) {
145 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
146 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
147 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
148 if (!k.is_null() && k->oop_is_instance()) {
149 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
150 oop mname2 = init_field_MemberName(mname, fd);
151 if (mname2 != NULL) {
152 // Since we have the reified name and type handy, add them to the result.
153 if (java_lang_invoke_MemberName::name(mname2) == NULL)
154 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
155 if (java_lang_invoke_MemberName::type(mname2) == NULL)
156 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
157 }
158 return mname2;
159 }
160 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
161 oop clazz = java_lang_reflect_Method::clazz(target_oop);
162 int slot = java_lang_reflect_Method::slot(target_oop);
163 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
164 if (!k.is_null() && k->oop_is_instance()) {
165 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
166 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
167 return NULL; // do not resolve unless there is a concrete signature
168 CallInfo info(m, k());
169 return init_method_MemberName(mname, info);
170 }
171 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
172 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
173 int slot = java_lang_reflect_Constructor::slot(target_oop);
174 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
175 if (!k.is_null() && k->oop_is_instance()) {
176 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
177 if (m == NULL) return NULL;
178 CallInfo info(m, k());
179 return init_method_MemberName(mname, info);
180 }
181 }
182 return NULL;
183 }
184
185 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
186 assert(info.resolved_appendix().is_null(), "only normal methods here");
187 methodHandle m = info.resolved_method();
188 assert(m.not_null(), "null method handle");
189 KlassHandle m_klass = m->method_holder();
190 assert(m.not_null(), "null holder for method handle");
191 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
192 int vmindex = Method::invalid_vtable_index;
193
194 switch (info.call_kind()) {
195 case CallInfo::itable_call:
196 vmindex = info.itable_index();
197 // More importantly, the itable index only works with the method holder.
198 assert(m_klass->verify_itable_index(vmindex), "");
199 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
200 if (TraceInvokeDynamic) {
201 ResourceMark rm;
202 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
203 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
204 vmindex);
205 m->access_flags().print_on(tty);
206 if (!m->is_abstract()) {
207 tty->print("default");
208 }
209 tty->cr();
210 }
211 break;
212
213 case CallInfo::vtable_call:
214 vmindex = info.vtable_index();
215 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
216 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
217 if (m_klass->is_interface()) {
218 // This is a vtable call to an interface method (abstract "miranda method" or default method).
219 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
220 // (LinkResolver should help us figure this out.)
221 KlassHandle m_klass_non_interface = info.resolved_klass();
222 if (m_klass_non_interface->is_interface()) {
223 m_klass_non_interface = SystemDictionary::Object_klass();
224 #ifdef ASSERT
225 { ResourceMark rm;
226 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
227 assert(m->name() == m2->name() && m->signature() == m2->signature(),
228 err_msg("at %d, %s != %s", vmindex,
229 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
230 }
231 #endif //ASSERT
232 }
233 if (!m->is_public()) {
234 assert(m->is_public(), "virtual call must be to public interface method");
235 return NULL; // elicit an error later in product build
236 }
237 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
238 m_klass = m_klass_non_interface;
239 }
240 if (TraceInvokeDynamic) {
241 ResourceMark rm;
242 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
243 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
244 m_klass->internal_name(), vmindex);
245 m->access_flags().print_on(tty);
246 if (m->is_default_method()) {
247 tty->print("default");
248 }
249 tty->cr();
250 }
251 break;
252
253 case CallInfo::direct_call:
254 vmindex = Method::nonvirtual_vtable_index;
255 if (m->is_static()) {
256 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
257 } else if (m->is_initializer()) {
258 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
259 } else {
260 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
261 }
262 break;
263
264 default: assert(false, "bad CallInfo"); return NULL;
265 }
266
267 // @CallerSensitive annotation detected
268 if (m->caller_sensitive()) {
269 flags |= CALLER_SENSITIVE;
270 }
271
272 oop mname_oop = mname();
273 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
274 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
275 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
276 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
277 // Note: name and type can be lazily computed by resolve_MemberName,
278 // if Java code needs them as resolved String and MethodType objects.
279 // The clazz must be eagerly stored, because it provides a GC
280 // root to help keep alive the Method*.
281 // If relevant, the vtable or itable value is stored as vmindex.
282 // This is done eagerly, since it is readily available without
283 // constructing any new objects.
284 // TO DO: maybe intern mname_oop
285 if (m->method_holder()->add_member_name(mname)) {
286 return mname();
287 } else {
288 // Redefinition caused this to fail. Return NULL (and an exception?)
289 return NULL;
290 }
291 }
292
293 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
294 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
295 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
296 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
297 Metadata* vmtarget = fd.field_holder();
298 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
299 oop mname_oop = mname();
300 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
301 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
302 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
303 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
304 oop type = field_signature_type_or_null(fd.signature());
305 oop name = field_name_or_null(fd.name());
306 if (name != NULL)
307 java_lang_invoke_MemberName::set_name(mname_oop, name);
308 if (type != NULL)
309 java_lang_invoke_MemberName::set_type(mname_oop, type);
310 // Note: name and type can be lazily computed by resolve_MemberName,
311 // if Java code needs them as resolved String and Class objects.
312 // Note that the incoming type oop might be pre-resolved (non-null).
313 // The base clazz and field offset (vmindex) must be eagerly stored,
314 // because they unambiguously identify the field.
315 // Although the fieldDescriptor::_index would also identify the field,
316 // we do not use it, because it is harder to decode.
317 // TO DO: maybe intern mname_oop
318 return mname();
319 }
320
321 // JVM 2.9 Special Methods:
322 // A method is signature polymorphic if and only if all of the following conditions hold :
323 // * It is declared in the java.lang.invoke.MethodHandle class.
324 // * It has a single formal parameter of type Object[].
325 // * It has a return type of Object.
326 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
327 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
328 if (klass == NULL)
329 return false;
330 // The following test will fail spuriously during bootstrap of MethodHandle itself:
331 // if (klass != SystemDictionary::MethodHandle_klass())
332 // Test the name instead:
333 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
334 return false;
335 Symbol* poly_sig = vmSymbols::object_array_object_signature();
336 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
337 if (m == NULL) return false;
338 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
339 int flags = m->access_flags().as_int();
340 return (flags & required) == required;
341 }
342
343
344 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
345 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
346 switch (iid) {
347 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
348 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
349 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
350 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
351 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
352 }
353 assert(false, "");
354 return 0;
355 }
356
357 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
358 switch (iid) {
359 case vmIntrinsics::_invokeBasic: return 0;
360 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
361 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
362 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
363 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
364 }
365 assert(false, err_msg("iid=%d", iid));
366 return 0;
367 }
368
369 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
370 vmSymbols::SID name_id = vmSymbols::find_sid(name);
371 switch (name_id) {
372 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
373 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
374 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
375 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
376
377 // There is one static signature-polymorphic method for each JVM invocation mode.
378 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
379 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
380 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
381 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
382 }
383
384 // Cover the case of invokeExact and any future variants of invokeFoo.
385 Klass* mh_klass = SystemDictionary::well_known_klass(
386 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
387 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
388 return vmIntrinsics::_invokeGeneric;
389
390 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
391 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
392 return vmIntrinsics::_none;
393 }
394
395 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
396 if (klass != NULL &&
397 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
398 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
399 if (iid != vmIntrinsics::_none)
400 return iid;
401 if (is_method_handle_invoke_name(klass, name))
402 return vmIntrinsics::_invokeGeneric;
403 }
404 return vmIntrinsics::_none;
405 }
406
407
408 // convert the external string or reflective type to an internal signature
409 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
410 if (java_lang_invoke_MethodType::is_instance(type_str)) {
411 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
412 } else if (java_lang_Class::is_instance(type_str)) {
413 return java_lang_Class::as_signature(type_str, false, THREAD);
414 } else if (java_lang_String::is_instance_inlined(type_str)) {
415 if (intern_if_not_found) {
416 return java_lang_String::as_symbol(type_str, THREAD);
417 } else {
418 return java_lang_String::as_symbol_or_null(type_str);
419 }
420 } else {
421 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
422 }
423 }
424
425 static const char OBJ_SIG[] = "Ljava/lang/Object;";
426 enum { OBJ_SIG_LEN = 18 };
427
428 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
429 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
430 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
431 const int len = sig->utf8_length();
432 for (int i = 0; i < len; i++) {
433 switch (sig->byte_at(i)) {
434 case 'L':
435 // only java/lang/Object is valid here
436 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
437 return false;
438 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
439 continue;
440 case '(': case ')': case 'V':
441 case 'I': case 'J': case 'F': case 'D':
442 continue;
443 //case '[':
444 //case 'Z': case 'B': case 'C': case 'S':
445 default:
446 return false;
447 }
448 }
449 return true;
450 }
451
452 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
453 Symbol* bsig = NULL;
454 if (sig == NULL) {
455 return sig;
456 } else if (is_basic_type_signature(sig)) {
457 sig->increment_refcount();
458 return sig; // that was easy
459 } else if (sig->byte_at(0) != '(') {
460 BasicType bt = char2type(sig->byte_at(0));
461 if (is_subword_type(bt)) {
462 bsig = vmSymbols::int_signature();
463 } else {
464 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
465 bsig = vmSymbols::object_signature();
466 }
467 } else {
468 ResourceMark rm;
469 stringStream buffer(128);
470 buffer.put('(');
471 int arg_pos = 0, keep_arg_pos = -1;
472 if (keep_last_arg)
473 keep_arg_pos = ArgumentCount(sig).size() - 1;
474 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
475 BasicType bt = ss.type();
476 size_t this_arg_pos = buffer.size();
477 if (ss.at_return_type()) {
478 buffer.put(')');
479 }
480 if (arg_pos == keep_arg_pos) {
481 buffer.write((char*) ss.raw_bytes(),
482 (int) ss.raw_length());
483 } else if (bt == T_OBJECT || bt == T_ARRAY) {
484 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
485 } else {
486 if (is_subword_type(bt))
487 bt = T_INT;
488 buffer.put(type2char(bt));
489 }
490 arg_pos++;
491 }
492 const char* sigstr = buffer.base();
493 int siglen = (int) buffer.size();
494 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
495 }
496 assert(is_basic_type_signature(bsig) ||
497 // detune assert in case the injected argument is not a basic type:
498 keep_last_arg, "");
499 return bsig;
500 }
501
502 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
503 Symbol* sig,
504 bool keep_arrays,
505 bool keep_basic_names) {
506 st = st ? st : tty;
507 int len = sig->utf8_length();
508 int array = 0;
509 bool prev_type = false;
510 for (int i = 0; i < len; i++) {
511 char ch = sig->byte_at(i);
512 switch (ch) {
513 case '(': case ')':
514 prev_type = false;
515 st->put(ch);
516 continue;
517 case '[':
518 if (!keep_basic_names && keep_arrays)
519 st->put(ch);
520 array++;
521 continue;
522 case 'L':
523 {
524 if (prev_type) st->put(',');
525 int start = i+1, slash = start;
526 while (++i < len && (ch = sig->byte_at(i)) != ';') {
527 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
528 }
529 if (slash < i) start = slash;
530 if (!keep_basic_names) {
531 st->put('L');
532 } else {
533 for (int j = start; j < i; j++)
534 st->put(sig->byte_at(j));
535 prev_type = true;
536 }
537 break;
538 }
539 default:
540 {
541 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
542 ch = '[';
543 array = 0;
544 }
545 if (prev_type) st->put(',');
546 const char* n = NULL;
547 if (keep_basic_names)
548 n = type2name(char2type(ch));
549 if (n == NULL) {
550 // unknown letter, or we don't want to know its name
551 st->put(ch);
552 } else {
553 st->print("%s", n);
554 prev_type = true;
555 }
556 break;
557 }
558 }
559 // Switch break goes here to take care of array suffix:
560 if (prev_type) {
561 while (array > 0) {
562 st->print("[]");
563 --array;
564 }
565 }
566 array = 0;
567 }
568 }
569
570
571
572 static oop object_java_mirror() {
573 return SystemDictionary::Object_klass()->java_mirror();
574 }
575
576 oop MethodHandles::field_name_or_null(Symbol* s) {
577 if (s == NULL) return NULL;
578 return StringTable::lookup(s);
579 }
580
581 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
582 if (s == NULL) return NULL;
583 BasicType bt = FieldType::basic_type(s);
584 if (is_java_primitive(bt)) {
585 assert(s->utf8_length() == 1, "");
586 return java_lang_Class::primitive_mirror(bt);
587 }
588 // Here are some more short cuts for common types.
589 // They are optional, since reference types can be resolved lazily.
590 if (bt == T_OBJECT) {
591 if (s == vmSymbols::object_signature()) {
592 return object_java_mirror();
593 } else if (s == vmSymbols::class_signature()) {
594 return SystemDictionary::Class_klass()->java_mirror();
595 } else if (s == vmSymbols::string_signature()) {
596 return SystemDictionary::String_klass()->java_mirror();
597 }
598 }
599 return NULL;
600 }
601
602
603 // An unresolved member name is a mere symbolic reference.
604 // Resolving it plants a vmtarget/vmindex in it,
605 // which refers directly to JVM internals.
606 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
607 Handle empty;
608 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
609
610 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
611 // Already resolved.
612 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
613 assert(vmindex >= Method::nonvirtual_vtable_index, "");
614 return mname;
615 }
616
617 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
618 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
619 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
620 int flags = java_lang_invoke_MemberName::flags(mname());
621 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
622 if (!ref_kind_is_valid(ref_kind)) {
623 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
624 }
625
626 DEBUG_ONLY(int old_vmindex);
627 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
628
629 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
630 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
631 }
632
633 instanceKlassHandle defc;
634 {
635 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
636 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
637 if (!defc_klass->oop_is_instance()) {
638 if (!defc_klass->oop_is_array()) return empty;
639 defc_klass = SystemDictionary::Object_klass();
640 }
641 defc = instanceKlassHandle(THREAD, defc_klass);
642 }
643 if (defc.is_null()) {
644 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
645 }
646 defc->link_class(CHECK_(empty)); // possible safepoint
647
648 // convert the external string name to an internal symbol
649 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
650 if (name == NULL) return empty; // no such name
651 if (name == vmSymbols::class_initializer_name())
652 return empty; // illegal name
653
654 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
655 if ((flags & ALL_KINDS) == IS_METHOD &&
656 (defc() == SystemDictionary::MethodHandle_klass()) &&
657 (ref_kind == JVM_REF_invokeVirtual ||
658 ref_kind == JVM_REF_invokeSpecial ||
659 // static invocation mode is required for _linkToVirtual, etc.:
660 ref_kind == JVM_REF_invokeStatic)) {
661 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
662 if (iid != vmIntrinsics::_none &&
663 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
664 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
665 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
666 mh_invoke_id = iid;
667 }
668 }
669
670 // convert the external string or reflective type to an internal signature
671 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
672 if (type == NULL) return empty; // no such signature exists in the VM
673
674 // Time to do the lookup.
675 switch (flags & ALL_KINDS) {
676 case IS_METHOD:
677 {
678 CallInfo result;
679 {
680 assert(!HAS_PENDING_EXCEPTION, "");
681 if (ref_kind == JVM_REF_invokeStatic) {
682 LinkResolver::resolve_static_call(result,
683 defc, name, type, caller, caller.not_null(), false, THREAD);
684 } else if (ref_kind == JVM_REF_invokeInterface) {
685 LinkResolver::resolve_interface_call(result, Handle(), defc,
686 defc, name, type, caller, caller.not_null(), false, THREAD);
687 } else if (mh_invoke_id != vmIntrinsics::_none) {
688 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
689 LinkResolver::resolve_handle_call(result,
690 defc, name, type, caller, THREAD);
691 } else if (ref_kind == JVM_REF_invokeSpecial) {
692 LinkResolver::resolve_special_call(result,
693 defc, name, type, caller, caller.not_null(), THREAD);
694 } else if (ref_kind == JVM_REF_invokeVirtual) {
695 LinkResolver::resolve_virtual_call(result, Handle(), defc,
696 defc, name, type, caller, caller.not_null(), false, THREAD);
697 } else {
698 assert(false, err_msg("ref_kind=%d", ref_kind));
699 }
700 if (HAS_PENDING_EXCEPTION) {
701 return empty;
702 }
703 }
704 if (result.resolved_appendix().not_null()) {
705 // The resolved MemberName must not be accompanied by an appendix argument,
706 // since there is no way to bind this value into the MemberName.
707 // Caller is responsible to prevent this from happening.
708 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
709 }
710 oop mname2 = init_method_MemberName(mname, result);
711 return Handle(THREAD, mname2);
712 }
713 case IS_CONSTRUCTOR:
714 {
715 CallInfo result;
716 {
717 assert(!HAS_PENDING_EXCEPTION, "");
718 if (name == vmSymbols::object_initializer_name()) {
719 LinkResolver::resolve_special_call(result,
720 defc, name, type, caller, caller.not_null(), THREAD);
721 } else {
722 break; // will throw after end of switch
723 }
724 if (HAS_PENDING_EXCEPTION) {
725 return empty;
726 }
727 }
728 assert(result.is_statically_bound(), "");
729 oop mname2 = init_method_MemberName(mname, result);
730 return Handle(THREAD, mname2);
731 }
732 case IS_FIELD:
733 {
734 fieldDescriptor result; // find_field initializes fd if found
735 {
736 assert(!HAS_PENDING_EXCEPTION, "");
737 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD);
738 if (HAS_PENDING_EXCEPTION) {
739 return empty;
740 }
741 }
742 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
743 return Handle(THREAD, mname2);
744 }
745 default:
746 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
747 }
748
749 return empty;
750 }
751
752 // Conversely, a member name which is only initialized from JVM internals
753 // may have null defc, name, and type fields.
754 // Resolving it plants a vmtarget/vmindex in it,
755 // which refers directly to JVM internals.
756 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
757 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
758 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
759 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
760 if (vmtarget == NULL) {
761 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
762 }
763
764 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
765 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
766 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
767 int flags = java_lang_invoke_MemberName::flags(mname());
768
769 if (suppress != 0) {
770 if (suppress & _suppress_defc) have_defc = true;
771 if (suppress & _suppress_name) have_name = true;
772 if (suppress & _suppress_type) have_type = true;
773 }
774
775 if (have_defc && have_name && have_type) return; // nothing needed
776
777 switch (flags & ALL_KINDS) {
778 case IS_METHOD:
779 case IS_CONSTRUCTOR:
780 {
781 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
782 methodHandle m(THREAD, (Method*)vmtarget);
783 DEBUG_ONLY(vmtarget = NULL); // safety
784 if (m.is_null()) break;
785 if (!have_defc) {
786 InstanceKlass* defc = m->method_holder();
787 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
788 }
789 if (!have_name) {
790 //not java_lang_String::create_from_symbol; let's intern member names
791 Handle name = StringTable::intern(m->name(), CHECK);
792 java_lang_invoke_MemberName::set_name(mname(), name());
793 }
794 if (!have_type) {
795 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
796 java_lang_invoke_MemberName::set_type(mname(), type());
797 }
798 return;
799 }
800 case IS_FIELD:
801 {
802 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
803 if (!((Klass*) vmtarget)->oop_is_instance()) break;
804 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
805 DEBUG_ONLY(vmtarget = NULL); // safety
806 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
807 fieldDescriptor fd; // find_field initializes fd if found
808 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
809 break; // cannot expand
810 if (!have_defc) {
811 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
812 }
813 if (!have_name) {
814 //not java_lang_String::create_from_symbol; let's intern member names
815 Handle name = StringTable::intern(fd.name(), CHECK);
816 java_lang_invoke_MemberName::set_name(mname(), name());
817 }
818 if (!have_type) {
819 // If it is a primitive field type, don't mess with short strings like "I".
820 Handle type = field_signature_type_or_null(fd.signature());
821 if (type.is_null()) {
822 java_lang_String::create_from_symbol(fd.signature(), CHECK);
823 }
824 java_lang_invoke_MemberName::set_type(mname(), type());
825 }
826 return;
827 }
828 }
829 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
830 }
831
832 int MethodHandles::find_MemberNames(KlassHandle k,
833 Symbol* name, Symbol* sig,
834 int mflags, KlassHandle caller,
835 int skip, objArrayHandle results) {
836 // %%% take caller into account!
837
838 Thread* thread = Thread::current();
839
840 if (k.is_null() || !k->oop_is_instance()) return -1;
841
842 int rfill = 0, rlimit = results->length(), rskip = skip;
843 // overflow measurement:
844 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
845
846 int match_flags = mflags;
847 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
848 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
849 bool local_only = !(search_superc | search_intfc);
850 bool classes_only = false;
851
852 if (name != NULL) {
853 if (name->utf8_length() == 0) return 0; // a match is not possible
854 }
855 if (sig != NULL) {
856 if (sig->utf8_length() == 0) return 0; // a match is not possible
857 if (sig->byte_at(0) == '(')
858 match_flags &= ~(IS_FIELD | IS_TYPE);
859 else
860 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
861 }
862
863 if ((match_flags & IS_TYPE) != 0) {
864 // NYI, and Core Reflection works quite well for this query
865 }
866
867 if ((match_flags & IS_FIELD) != 0) {
868 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
869 if (name != NULL && st.name() != name)
870 continue;
871 if (sig != NULL && st.signature() != sig)
872 continue;
873 // passed the filters
874 if (rskip > 0) {
875 --rskip;
876 } else if (rfill < rlimit) {
877 Handle result(thread, results->obj_at(rfill++));
878 if (!java_lang_invoke_MemberName::is_instance(result()))
879 return -99; // caller bug!
880 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
881 if (saved != result())
882 results->obj_at_put(rfill-1, saved); // show saved instance to user
883 } else if (++overflow >= overflow_limit) {
884 match_flags = 0; break; // got tired of looking at overflow
885 }
886 }
887 }
888
889 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
890 // watch out for these guys:
891 Symbol* init_name = vmSymbols::object_initializer_name();
892 Symbol* clinit_name = vmSymbols::class_initializer_name();
893 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
894 bool negate_name_test = false;
895 // fix name so that it captures the intention of IS_CONSTRUCTOR
896 if (!(match_flags & IS_METHOD)) {
897 // constructors only
898 if (name == NULL) {
899 name = init_name;
900 } else if (name != init_name) {
901 return 0; // no constructors of this method name
902 }
903 } else if (!(match_flags & IS_CONSTRUCTOR)) {
904 // methods only
905 if (name == NULL) {
906 name = init_name;
907 negate_name_test = true; // if we see the name, we *omit* the entry
908 } else if (name == init_name) {
909 return 0; // no methods of this constructor name
910 }
911 } else {
912 // caller will accept either sort; no need to adjust name
913 }
914 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
915 Method* m = st.method();
916 Symbol* m_name = m->name();
917 if (m_name == clinit_name)
918 continue;
919 if (name != NULL && ((m_name != name) ^ negate_name_test))
920 continue;
921 if (sig != NULL && m->signature() != sig)
922 continue;
923 // passed the filters
924 if (rskip > 0) {
925 --rskip;
926 } else if (rfill < rlimit) {
927 Handle result(thread, results->obj_at(rfill++));
928 if (!java_lang_invoke_MemberName::is_instance(result()))
929 return -99; // caller bug!
930 CallInfo info(m);
931 oop saved = MethodHandles::init_method_MemberName(result, info);
932 if (saved != result())
933 results->obj_at_put(rfill-1, saved); // show saved instance to user
934 } else if (++overflow >= overflow_limit) {
935 match_flags = 0; break; // got tired of looking at overflow
936 }
937 }
938 }
939
940 // return number of elements we at leasted wanted to initialize
941 return rfill + overflow;
942 }
943
944 // Get context class for a CallSite instance: either extract existing context or use default one.
945 InstanceKlass* MethodHandles::get_call_site_context(oop call_site) {
946 // In order to extract a context the following traversal is performed:
947 // CallSite.context => Cleaner.referent => Class._klass => Klass
948 assert(java_lang_invoke_CallSite::is_instance(call_site), "");
949 oop context_oop = java_lang_invoke_CallSite::context_volatile(call_site);
950 if (oopDesc::is_null(context_oop)) {
951 return NULL; // The context hasn't been initialized yet.
952 }
953 oop context_class_oop = java_lang_ref_Reference::referent(context_oop);
954 if (oopDesc::is_null(context_class_oop)) {
955 // The context reference was cleared by GC, so current dependency context
956 // isn't usable anymore. Context should be fetched from CallSite again.
957 return NULL;
958 }
959 return InstanceKlass::cast(java_lang_Class::as_Klass(context_class_oop));
960 }
961
962 //------------------------------------------------------------------------------
963 // MemberNameTable
964 //
965
966 MemberNameTable::MemberNameTable(int methods_cnt)
967 : GrowableArray<jweak>(methods_cnt, true) {
968 assert_locked_or_safepoint(MemberNameTable_lock);
969 }
970
971 MemberNameTable::~MemberNameTable() {
972 assert_locked_or_safepoint(MemberNameTable_lock);
973 int len = this->length();
974
975 for (int idx = 0; idx < len; idx++) {
976 jweak ref = this->at(idx);
977 JNIHandles::destroy_weak_global(ref);
978 }
979 }
980
981 void MemberNameTable::add_member_name(jweak mem_name_wref) {
982 assert_locked_or_safepoint(MemberNameTable_lock);
983 this->push(mem_name_wref);
984 }
985
986 #if INCLUDE_JVMTI
987 // It is called at safepoint only for RedefineClasses
988 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
989 int methods_length, bool *trace_name_printed) {
990 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
991 // For each redefined method
992 for (int j = 0; j < methods_length; j++) {
993 Method* old_method = old_methods[j];
994 Method* new_method = new_methods[j];
995
996 // search the MemberNameTable for uses of either obsolete or EMCP methods
997 for (int idx = 0; idx < length(); idx++) {
998 oop mem_name = JNIHandles::resolve(this->at(idx));
999 if (mem_name != NULL) {
1000 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, old_method, new_method,
1001 trace_name_printed);
1002 }
1003 }
1004 }
1005 }
1006 #endif // INCLUDE_JVMTI
1007
1008 //
1009 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1010 // They are the private interface between this JVM and the HotSpot-specific
1011 // Java code that implements JSR 292 method handles.
1012 //
1013 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1014 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1015 //
1016
1017 #ifndef PRODUCT
1018 #define EACH_NAMED_CON(template, requirement) \
1019 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1020 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1021 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1022 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1023 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1024 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1025 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1026 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1027 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1028 /*end*/
1029
1030 #define IGNORE_REQ(req_expr) /* req_expr */
1031 #define ONE_PLUS(scope,value) 1+
1032 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1033 #define VALUE_COMMA(scope,value) scope::value,
1034 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1035 #define STRING_NULL(scope,value) #value "\0"
1036 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1037
1038 static bool advertise_con_value(int which) {
1039 if (which < 0) return false;
1040 bool ok = true;
1041 int count = 0;
1042 #define INC_COUNT(scope,value) \
1043 ++count;
1044 #define CHECK_REQ(req_expr) \
1045 if (which < count) return ok; \
1046 ok = (req_expr);
1047 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1048 #undef INC_COUNT
1049 #undef CHECK_REQ
1050 assert(count == con_value_count, "");
1051 if (which < count) return ok;
1052 return false;
1053 }
1054
1055 #undef ONE_PLUS
1056 #undef VALUE_COMMA
1057 #undef STRING_NULL
1058 #undef EACH_NAMED_CON
1059 #endif // PRODUCT
1060
1061 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1062 #ifndef PRODUCT
1063 if (advertise_con_value(which)) {
1064 assert(which >= 0 && which < con_value_count, "");
1065 int con = con_values[which];
1066 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1067 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1068 const char* str = &con_names[0];
1069 for (int i = 0; i < which; i++)
1070 str += strlen(str) + 1; // skip name and null
1071 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1072 box->obj_at_put(0, name);
1073 }
1074 return con;
1075 }
1076 #endif
1077 return 0;
1078 }
1079 JVM_END
1080
1081 // void init(MemberName self, AccessibleObject ref)
1082 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1083 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1084 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1085 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1086 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1087 MethodHandles::init_MemberName(mname, target);
1088 }
1089 JVM_END
1090
1091 // void expand(MemberName self)
1092 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1093 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1094 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1095 MethodHandles::expand_MemberName(mname, 0, CHECK);
1096 }
1097 JVM_END
1098
1099 // void resolve(MemberName self, Class<?> caller)
1100 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1101 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1102 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1103
1104 // The trusted Java code that calls this method should already have performed
1105 // access checks on behalf of the given caller. But, we can verify this.
1106 if (VerifyMethodHandles && caller_jh != NULL &&
1107 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1108 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1109 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1110 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1111 }
1112
1113 // Reflection::verify_class_access can only handle instance classes.
1114 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1115 // Emulate LinkResolver::check_klass_accessability.
1116 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1117 if (!Reflection::verify_class_access(caller,
1118 reference_klass,
1119 true)) {
1120 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1121 }
1122 }
1123 }
1124
1125 KlassHandle caller(THREAD,
1126 caller_jh == NULL ? (Klass*) NULL :
1127 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1128 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1129
1130 if (resolved.is_null()) {
1131 int flags = java_lang_invoke_MemberName::flags(mname());
1132 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1133 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1134 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1135 }
1136 if ((flags & ALL_KINDS) == IS_FIELD) {
1137 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1138 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1139 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1140 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1141 } else {
1142 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1143 }
1144 }
1145
1146 return JNIHandles::make_local(THREAD, resolved());
1147 }
1148 JVM_END
1149
1150 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1151 if (mname == NULL ||
1152 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1153 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1154 } else {
1155 int flags = java_lang_invoke_MemberName::flags(mname);
1156 if ((flags & IS_FIELD) != 0 &&
1157 (must_be_static
1158 ? (flags & JVM_ACC_STATIC) != 0
1159 : (flags & JVM_ACC_STATIC) == 0)) {
1160 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1161 return (jlong) vmindex;
1162 }
1163 }
1164 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1165 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1166 return 0;
1167 }
1168
1169 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1170 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1171 }
1172 JVM_END
1173
1174 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1175 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1176 }
1177 JVM_END
1178
1179 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1180 // use the other function to perform sanity checks:
1181 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1182 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1183 return JNIHandles::make_local(THREAD, clazz);
1184 }
1185 JVM_END
1186
1187 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1188 if (mname_jh == NULL) return NULL;
1189 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1190 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1191 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1192 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1193 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1194 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1195 result->obj_at_put(0, x);
1196 x = NULL;
1197 if (vmtarget == NULL) {
1198 x = NULL;
1199 } else if (vmtarget->is_klass()) {
1200 x = ((Klass*) vmtarget)->java_mirror();
1201 } else if (vmtarget->is_method()) {
1202 x = mname();
1203 }
1204 result->obj_at_put(1, x);
1205 return JNIHandles::make_local(env, result());
1206 }
1207 JVM_END
1208
1209
1210
1211 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1212 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1213 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1214 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1215 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1216 if (clazz_jh == NULL || results_jh == NULL) return -1;
1217 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1218
1219 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1220 if (results.is_null() || !results->is_objArray()) return -1;
1221
1222 TempNewSymbol name = NULL;
1223 TempNewSymbol sig = NULL;
1224 if (name_jh != NULL) {
1225 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1226 if (name == NULL) return 0; // a match is not possible
1227 }
1228 if (sig_jh != NULL) {
1229 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1230 if (sig == NULL) return 0; // a match is not possible
1231 }
1232
1233 KlassHandle caller;
1234 if (caller_jh != NULL) {
1235 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1236 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1237 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1238 }
1239
1240 if (name != NULL && sig != NULL && results.not_null()) {
1241 // try a direct resolve
1242 // %%% TO DO
1243 }
1244
1245 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1246 caller, skip, results);
1247 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1248 return res;
1249 }
1250 JVM_END
1251
1252 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1253 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1254 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1255 {
1256 // Walk all nmethods depending on this call site.
1257 MutexLocker mu(Compile_lock, thread);
1258 CodeCache::flush_dependents_on(call_site, target);
1259 java_lang_invoke_CallSite::set_target(call_site(), target());
1260 }
1261 }
1262 JVM_END
1263
1264 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1265 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1266 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1267 {
1268 // Walk all nmethods depending on this call site.
1269 MutexLocker mu(Compile_lock, thread);
1270 CodeCache::flush_dependents_on(call_site, target);
1271 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1272 }
1273 }
1274 JVM_END
1275
1276 JVM_ENTRY(void, MHN_invalidateDependentNMethods(JNIEnv* env, jobject igcls, jobject call_site_jh)) {
1277 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1278 {
1279 // Walk all nmethods depending on this call site.
1280 MutexLocker mu1(Compile_lock, thread);
1281
1282 CallSiteDepChange changes(call_site(), Handle());
1283
1284 InstanceKlass* ctxk = MethodHandles::get_call_site_context(call_site());
1285 if (ctxk == NULL) {
1286 return; // No dependencies to invalidate yet.
1287 }
1288 int marked = 0;
1289 {
1290 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1291 marked = ctxk->mark_dependent_nmethods(changes);
1292 }
1293 java_lang_invoke_CallSite::set_context_volatile(call_site(), NULL); // Reset call site to initial state
1294 if (marked > 0) {
1295 // At least one nmethod has been marked for deoptimization
1296 VM_Deoptimize op;
1297 VMThread::execute(&op);
1298 }
1299 }
1300 }
1301 JVM_END
1302
1303 /**
1304 * Throws a java/lang/UnsupportedOperationException unconditionally.
1305 * This is required by the specification of MethodHandle.invoke if
1306 * invoked directly.
1307 */
1308 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1309 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1310 return NULL;
1311 }
1312 JVM_END
1313
1314 /**
1315 * Throws a java/lang/UnsupportedOperationException unconditionally.
1316 * This is required by the specification of MethodHandle.invokeExact if
1317 * invoked directly.
1318 */
1319 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1320 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1321 return NULL;
1322 }
1323 JVM_END
1324
1325 /// JVM_RegisterMethodHandleMethods
1326
1327 #undef CS // Solaris builds complain
1328
1329 #define LANG "Ljava/lang/"
1330 #define JLINV "Ljava/lang/invoke/"
1331
1332 #define OBJ LANG"Object;"
1333 #define CLS LANG"Class;"
1334 #define STRG LANG"String;"
1335 #define CS JLINV"CallSite;"
1336 #define MT JLINV"MethodType;"
1337 #define MH JLINV"MethodHandle;"
1338 #define MEM JLINV"MemberName;"
1339
1340 #define CC (char*) /*cast a literal from (const char*)*/
1341 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1342
1343 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1344 static JNINativeMethod MHN_methods[] = {
1345 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1346 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1347 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1348 // static native int getNamedCon(int which, Object[] name)
1349 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1350 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1351 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1352 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1353 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1354 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1355 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1356 {CC"invalidateDependentNMethods", CC"("CS")V", FN_PTR(MHN_invalidateDependentNMethods)},
1357 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1358 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1359 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1360 };
1361
1362 static JNINativeMethod MH_methods[] = {
1363 // UnsupportedOperationException throwers
1364 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1365 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1366 };
1367
1368 /**
1369 * Helper method to register native methods.
1370 */
1371 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1372 int status = env->RegisterNatives(clazz, methods, nMethods);
1373 if (status != JNI_OK || env->ExceptionOccurred()) {
1374 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1375 env->ExceptionClear();
1376 return false;
1377 }
1378 return true;
1379 }
1380
1381 /**
1382 * This one function is exported, used by NativeLookup.
1383 */
1384 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1385 assert(!MethodHandles::enabled(), "must not be enabled");
1386 bool enable_MH = true;
1387
1388 jclass MH_class = NULL;
1389 if (SystemDictionary::MethodHandle_klass() == NULL) {
1390 enable_MH = false;
1391 } else {
1392 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1393 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1394 }
1395
1396 if (enable_MH) {
1397 ThreadToNativeFromVM ttnfv(thread);
1398
1399 if (enable_MH) {
1400 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1401 }
1402 if (enable_MH) {
1403 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1404 }
1405 }
1406
1407 if (TraceInvokeDynamic) {
1408 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1409 }
1410
1411 if (enable_MH) {
1412 if (MethodHandles::generate_adapters() == false) {
1413 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters");
1414 }
1415 MethodHandles::set_enabled(true);
1416 }
1417 }
1418 JVM_END