1 /*
2 * Copyright (c) 2008, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "compiler/compileBroker.hpp"
28 #include "interpreter/interpreter.hpp"
29 #include "interpreter/oopMapCache.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "prims/methodHandles.hpp"
33 #include "runtime/compilationPolicy.hpp"
34 #include "runtime/javaCalls.hpp"
35 #include "runtime/reflection.hpp"
36 #include "runtime/signature.hpp"
37 #include "runtime/stubRoutines.hpp"
38
39
40 /*
41 * JSR 292 reference implementation: method handles
42 * The JDK 7 reference implementation represented method handle
43 * combinations as chains. Each link in the chain had a "vmentry"
44 * field which pointed at a bit of assembly code which performed
45 * one transformation before dispatching to the next link in the chain.
46 *
47 * The current reference implementation pushes almost all code generation
48 * responsibility to (trusted) Java code. A method handle contains a
49 * pointer to its "LambdaForm", which embodies all details of the method
50 * handle's behavior. The LambdaForm is a normal Java object, managed
51 * by a runtime coded in Java.
52 */
53
54 bool MethodHandles::_enabled = false; // set true after successful native linkage
55 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
56
57 //------------------------------------------------------------------------------
58 // MethodHandles::generate_adapters
59 //
60 void MethodHandles::generate_adapters() {
61 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
62
63 assert(_adapter_code == NULL, "generate only once");
64
65 ResourceMark rm;
66 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
67 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
68 if (_adapter_code == NULL)
69 vm_exit_out_of_memory(adapter_code_size, OOM_MALLOC_ERROR,
70 "CodeCache: no room for MethodHandles adapters");
71 {
72 CodeBuffer code(_adapter_code);
73 MethodHandlesAdapterGenerator g(&code);
74 g.generate();
75 code.log_section_sizes("MethodHandlesAdapterBlob");
76 }
77 }
78
79 //------------------------------------------------------------------------------
80 // MethodHandlesAdapterGenerator::generate
81 //
82 void MethodHandlesAdapterGenerator::generate() {
83 // Generate generic method handle adapters.
84 // Generate interpreter entries
85 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
86 mk <= Interpreter::method_handle_invoke_LAST;
87 mk = Interpreter::MethodKind(1 + (int)mk)) {
88 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
89 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
90 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
91 if (entry != NULL) {
92 Interpreter::set_entry_for_kind(mk, entry);
93 }
94 // If the entry is not set, it will throw AbstractMethodError.
95 }
96 }
97
98 void MethodHandles::set_enabled(bool z) {
99 if (_enabled != z) {
100 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
101 _enabled = z;
102 }
103 }
104
105 // MemberName support
106
107 // import java_lang_invoke_MemberName.*
108 enum {
109 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
110 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
111 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
112 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
113 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
114 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
115 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
116 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
117 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
118 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
119 };
120
121 Handle MethodHandles::new_MemberName(TRAPS) {
122 Handle empty;
123 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
124 if (!k->is_initialized()) k->initialize(CHECK_(empty));
125 return Handle(THREAD, k->allocate_instance(THREAD));
126 }
127
128 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
129 // This method is used from java.lang.invoke.MemberName constructors.
130 // It fills in the new MemberName from a java.lang.reflect.Member.
131 Thread* thread = Thread::current();
132 oop target_oop = target();
133 Klass* target_klass = target_oop->klass();
134 if (target_klass == SystemDictionary::reflect_Field_klass()) {
135 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
136 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
137 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
138 if (!k.is_null() && k->oop_is_instance()) {
139 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
140 oop mname2 = init_field_MemberName(mname, fd);
141 if (mname2 != NULL) {
142 // Since we have the reified name and type handy, add them to the result.
143 if (java_lang_invoke_MemberName::name(mname2) == NULL)
144 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
145 if (java_lang_invoke_MemberName::type(mname2) == NULL)
146 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
147 }
148 return mname2;
149 }
150 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
151 oop clazz = java_lang_reflect_Method::clazz(target_oop);
152 int slot = java_lang_reflect_Method::slot(target_oop);
153 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
154 if (!k.is_null() && k->oop_is_instance()) {
155 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
156 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
157 return NULL; // do not resolve unless there is a concrete signature
158 CallInfo info(m, k());
159 return init_method_MemberName(mname, info);
160 }
161 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
162 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
163 int slot = java_lang_reflect_Constructor::slot(target_oop);
164 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
165 if (!k.is_null() && k->oop_is_instance()) {
166 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
167 if (m == NULL) return NULL;
168 CallInfo info(m, k());
169 return init_method_MemberName(mname, info);
170 }
171 }
172 return NULL;
173 }
174
175 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
176 assert(info.resolved_appendix().is_null(), "only normal methods here");
177 methodHandle m = info.resolved_method();
178 KlassHandle m_klass = m->method_holder();
179 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
180 int vmindex = Method::invalid_vtable_index;
181
182 switch (info.call_kind()) {
183 case CallInfo::itable_call:
184 vmindex = info.itable_index();
185 // More importantly, the itable index only works with the method holder.
186 assert(m_klass->verify_itable_index(vmindex), "");
187 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
188 if (TraceInvokeDynamic) {
189 ResourceMark rm;
190 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
191 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
192 vmindex);
193 m->access_flags().print_on(tty);
194 if (!m->is_abstract()) {
195 tty->print("default");
196 }
197 tty->cr();
198 }
199 break;
200
201 case CallInfo::vtable_call:
202 vmindex = info.vtable_index();
203 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
204 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
205 if (m_klass->is_interface()) {
206 // This is a vtable call to an interface method (abstract "miranda method" or default method).
207 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
208 // (LinkResolver should help us figure this out.)
209 KlassHandle m_klass_non_interface = info.resolved_klass();
210 if (m_klass_non_interface->is_interface()) {
211 m_klass_non_interface = SystemDictionary::Object_klass();
212 #ifdef ASSERT
213 { ResourceMark rm;
214 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
215 assert(m->name() == m2->name() && m->signature() == m2->signature(),
216 err_msg("at %d, %s != %s", vmindex,
217 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
218 }
219 #endif //ASSERT
220 }
221 if (!m->is_public()) {
222 assert(m->is_public(), "virtual call must be to public interface method");
223 return NULL; // elicit an error later in product build
224 }
225 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
226 m_klass = m_klass_non_interface;
227 }
228 if (TraceInvokeDynamic) {
229 ResourceMark rm;
230 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
231 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
232 m_klass->internal_name(), vmindex);
233 m->access_flags().print_on(tty);
234 if (m->is_default_method()) {
235 tty->print("default");
236 }
237 tty->cr();
238 }
239 break;
240
241 case CallInfo::direct_call:
242 vmindex = Method::nonvirtual_vtable_index;
243 if (m->is_static()) {
244 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
245 } else if (m->is_initializer()) {
246 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
247 } else {
248 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
249 }
250 break;
251
252 default: assert(false, "bad CallInfo"); return NULL;
253 }
254
255 // @CallerSensitive annotation detected
256 if (m->caller_sensitive()) {
257 flags |= CALLER_SENSITIVE;
258 }
259
260 oop mname_oop = mname();
261 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
262 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
263 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
264 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
265 // Note: name and type can be lazily computed by resolve_MemberName,
266 // if Java code needs them as resolved String and MethodType objects.
267 // The clazz must be eagerly stored, because it provides a GC
268 // root to help keep alive the Method*.
269 // If relevant, the vtable or itable value is stored as vmindex.
270 // This is done eagerly, since it is readily available without
271 // constructing any new objects.
272 // TO DO: maybe intern mname_oop
273 if (m->method_holder()->add_member_name(mname)) {
274 return mname();
275 } else {
276 // Redefinition caused this to fail. Return NULL (and an exception?)
277 return NULL;
278 }
279 }
280
281 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
282 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
283 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
284 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
285 Metadata* vmtarget = fd.field_holder();
286 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
287 oop mname_oop = mname();
288 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
289 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
290 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
291 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
292 oop type = field_signature_type_or_null(fd.signature());
293 oop name = field_name_or_null(fd.name());
294 if (name != NULL)
295 java_lang_invoke_MemberName::set_name(mname_oop, name);
296 if (type != NULL)
297 java_lang_invoke_MemberName::set_type(mname_oop, type);
298 // Note: name and type can be lazily computed by resolve_MemberName,
299 // if Java code needs them as resolved String and Class objects.
300 // Note that the incoming type oop might be pre-resolved (non-null).
301 // The base clazz and field offset (vmindex) must be eagerly stored,
302 // because they unambiguously identify the field.
303 // Although the fieldDescriptor::_index would also identify the field,
304 // we do not use it, because it is harder to decode.
305 // TO DO: maybe intern mname_oop
306 return mname();
307 }
308
309 // JVM 2.9 Special Methods:
310 // A method is signature polymorphic if and only if all of the following conditions hold :
311 // * It is declared in the java.lang.invoke.MethodHandle class.
312 // * It has a single formal parameter of type Object[].
313 // * It has a return type of Object.
314 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
315 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
316 if (klass == NULL)
317 return false;
318 // The following test will fail spuriously during bootstrap of MethodHandle itself:
319 // if (klass != SystemDictionary::MethodHandle_klass())
320 // Test the name instead:
321 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
322 return false;
323 Symbol* poly_sig = vmSymbols::object_array_object_signature();
324 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
325 if (m == NULL) return false;
326 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
327 int flags = m->access_flags().as_int();
328 return (flags & required) == required;
329 }
330
331
332 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
333 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
334 switch (iid) {
335 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
336 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
337 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
338 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
339 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
340 }
341 assert(false, "");
342 return 0;
343 }
344
345 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
346 switch (iid) {
347 case vmIntrinsics::_invokeBasic: return 0;
348 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
349 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
350 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
351 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
352 }
353 assert(false, err_msg("iid=%d", iid));
354 return 0;
355 }
356
357 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
358 vmSymbols::SID name_id = vmSymbols::find_sid(name);
359 switch (name_id) {
360 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
361 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
362 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
363 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
364
365 // There is one static signature-polymorphic method for each JVM invocation mode.
366 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
367 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
368 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
369 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
370 }
371
372 // Cover the case of invokeExact and any future variants of invokeFoo.
373 Klass* mh_klass = SystemDictionary::well_known_klass(
374 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
375 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
376 return vmIntrinsics::_invokeGeneric;
377
378 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
379 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
380 return vmIntrinsics::_none;
381 }
382
383 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
384 if (klass != NULL &&
385 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
386 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
387 if (iid != vmIntrinsics::_none)
388 return iid;
389 if (is_method_handle_invoke_name(klass, name))
390 return vmIntrinsics::_invokeGeneric;
391 }
392 return vmIntrinsics::_none;
393 }
394
395
396 // convert the external string or reflective type to an internal signature
397 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
398 if (java_lang_invoke_MethodType::is_instance(type_str)) {
399 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
400 } else if (java_lang_Class::is_instance(type_str)) {
401 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
402 } else if (java_lang_String::is_instance(type_str)) {
403 if (intern_if_not_found) {
404 return java_lang_String::as_symbol(type_str, CHECK_NULL);
405 } else {
406 return java_lang_String::as_symbol_or_null(type_str);
407 }
408 } else {
409 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
410 }
411 }
412
413 static const char OBJ_SIG[] = "Ljava/lang/Object;";
414 enum { OBJ_SIG_LEN = 18 };
415
416 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
417 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
418 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
419 const int len = sig->utf8_length();
420 for (int i = 0; i < len; i++) {
421 switch (sig->byte_at(i)) {
422 case 'L':
423 // only java/lang/Object is valid here
424 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
425 return false;
426 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
427 continue;
428 case '(': case ')': case 'V':
429 case 'I': case 'J': case 'F': case 'D':
430 continue;
431 //case '[':
432 //case 'Z': case 'B': case 'C': case 'S':
433 default:
434 return false;
435 }
436 }
437 return true;
438 }
439
440 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
441 Symbol* bsig = NULL;
442 if (sig == NULL) {
443 return sig;
444 } else if (is_basic_type_signature(sig)) {
445 sig->increment_refcount();
446 return sig; // that was easy
447 } else if (sig->byte_at(0) != '(') {
448 BasicType bt = char2type(sig->byte_at(0));
449 if (is_subword_type(bt)) {
450 bsig = vmSymbols::int_signature();
451 } else {
452 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
453 bsig = vmSymbols::object_signature();
454 }
455 } else {
456 ResourceMark rm;
457 stringStream buffer(128);
458 buffer.put('(');
459 int arg_pos = 0, keep_arg_pos = -1;
460 if (keep_last_arg)
461 keep_arg_pos = ArgumentCount(sig).size() - 1;
462 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
463 BasicType bt = ss.type();
464 size_t this_arg_pos = buffer.size();
465 if (ss.at_return_type()) {
466 buffer.put(')');
467 }
468 if (arg_pos == keep_arg_pos) {
469 buffer.write((char*) ss.raw_bytes(),
470 (int) ss.raw_length());
471 } else if (bt == T_OBJECT || bt == T_ARRAY) {
472 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
473 } else {
474 if (is_subword_type(bt))
475 bt = T_INT;
476 buffer.put(type2char(bt));
477 }
478 arg_pos++;
479 }
480 const char* sigstr = buffer.base();
481 int siglen = (int) buffer.size();
482 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
483 }
484 assert(is_basic_type_signature(bsig) ||
485 // detune assert in case the injected argument is not a basic type:
486 keep_last_arg, "");
487 return bsig;
488 }
489
490 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
491 Symbol* sig,
492 bool keep_arrays,
493 bool keep_basic_names) {
494 st = st ? st : tty;
495 int len = sig->utf8_length();
496 int array = 0;
497 bool prev_type = false;
498 for (int i = 0; i < len; i++) {
499 char ch = sig->byte_at(i);
500 switch (ch) {
501 case '(': case ')':
502 prev_type = false;
503 st->put(ch);
504 continue;
505 case '[':
506 if (!keep_basic_names && keep_arrays)
507 st->put(ch);
508 array++;
509 continue;
510 case 'L':
511 {
512 if (prev_type) st->put(',');
513 int start = i+1, slash = start;
514 while (++i < len && (ch = sig->byte_at(i)) != ';') {
515 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
516 }
517 if (slash < i) start = slash;
518 if (!keep_basic_names) {
519 st->put('L');
520 } else {
521 for (int j = start; j < i; j++)
522 st->put(sig->byte_at(j));
523 prev_type = true;
524 }
525 break;
526 }
527 default:
528 {
529 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
530 ch = '[';
531 array = 0;
532 }
533 if (prev_type) st->put(',');
534 const char* n = NULL;
535 if (keep_basic_names)
536 n = type2name(char2type(ch));
537 if (n == NULL) {
538 // unknown letter, or we don't want to know its name
539 st->put(ch);
540 } else {
541 st->print("%s", n);
542 prev_type = true;
543 }
544 break;
545 }
546 }
547 // Switch break goes here to take care of array suffix:
548 if (prev_type) {
549 while (array > 0) {
550 st->print("[]");
551 --array;
552 }
553 }
554 array = 0;
555 }
556 }
557
558
559
560 static oop object_java_mirror() {
561 return SystemDictionary::Object_klass()->java_mirror();
562 }
563
564 oop MethodHandles::field_name_or_null(Symbol* s) {
565 if (s == NULL) return NULL;
566 return StringTable::lookup(s);
567 }
568
569 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
570 if (s == NULL) return NULL;
571 BasicType bt = FieldType::basic_type(s);
572 if (is_java_primitive(bt)) {
573 assert(s->utf8_length() == 1, "");
574 return java_lang_Class::primitive_mirror(bt);
575 }
576 // Here are some more short cuts for common types.
577 // They are optional, since reference types can be resolved lazily.
578 if (bt == T_OBJECT) {
579 if (s == vmSymbols::object_signature()) {
580 return object_java_mirror();
581 } else if (s == vmSymbols::class_signature()) {
582 return SystemDictionary::Class_klass()->java_mirror();
583 } else if (s == vmSymbols::string_signature()) {
584 return SystemDictionary::String_klass()->java_mirror();
585 }
586 }
587 return NULL;
588 }
589
590
591 // An unresolved member name is a mere symbolic reference.
592 // Resolving it plants a vmtarget/vmindex in it,
593 // which refers directly to JVM internals.
594 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
595 Handle empty;
596 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
597
598 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
599 // Already resolved.
600 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
601 assert(vmindex >= Method::nonvirtual_vtable_index, "");
602 return mname;
603 }
604
605 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
606 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
607 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
608 int flags = java_lang_invoke_MemberName::flags(mname());
609 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
610 if (!ref_kind_is_valid(ref_kind)) {
611 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
612 }
613
614 DEBUG_ONLY(int old_vmindex);
615 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
616
617 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
618 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
619 }
620
621 instanceKlassHandle defc;
622 {
623 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
624 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
625 if (!defc_klass->oop_is_instance()) {
626 if (!defc_klass->oop_is_array()) return empty;
627 defc_klass = SystemDictionary::Object_klass();
628 }
629 defc = instanceKlassHandle(THREAD, defc_klass);
630 }
631 if (defc.is_null()) {
632 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
633 }
634 defc->link_class(CHECK_(empty)); // possible safepoint
635
636 // convert the external string name to an internal symbol
637 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
638 if (name == NULL) return empty; // no such name
639 if (name == vmSymbols::class_initializer_name())
640 return empty; // illegal name
641
642 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
643 if ((flags & ALL_KINDS) == IS_METHOD &&
644 (defc() == SystemDictionary::MethodHandle_klass()) &&
645 (ref_kind == JVM_REF_invokeVirtual ||
646 ref_kind == JVM_REF_invokeSpecial ||
647 // static invocation mode is required for _linkToVirtual, etc.:
648 ref_kind == JVM_REF_invokeStatic)) {
649 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
650 if (iid != vmIntrinsics::_none &&
651 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
652 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
653 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
654 mh_invoke_id = iid;
655 }
656 }
657
658 // convert the external string or reflective type to an internal signature
659 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
660 if (type == NULL) return empty; // no such signature exists in the VM
661
662 // Time to do the lookup.
663 switch (flags & ALL_KINDS) {
664 case IS_METHOD:
665 {
666 CallInfo result;
667 {
668 assert(!HAS_PENDING_EXCEPTION, "");
669 if (ref_kind == JVM_REF_invokeStatic) {
670 LinkResolver::resolve_static_call(result,
671 defc, name, type, caller, caller.not_null(), false, THREAD);
672 } else if (ref_kind == JVM_REF_invokeInterface) {
673 LinkResolver::resolve_interface_call(result, Handle(), defc,
674 defc, name, type, caller, caller.not_null(), false, THREAD);
675 } else if (mh_invoke_id != vmIntrinsics::_none) {
676 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
677 LinkResolver::resolve_handle_call(result,
678 defc, name, type, caller, THREAD);
679 } else if (ref_kind == JVM_REF_invokeSpecial) {
680 LinkResolver::resolve_special_call(result,
681 defc, name, type, caller, caller.not_null(), THREAD);
682 } else if (ref_kind == JVM_REF_invokeVirtual) {
683 LinkResolver::resolve_virtual_call(result, Handle(), defc,
684 defc, name, type, caller, caller.not_null(), false, THREAD);
685 } else {
686 assert(false, err_msg("ref_kind=%d", ref_kind));
687 }
688 if (HAS_PENDING_EXCEPTION) {
689 return empty;
690 }
691 }
692 if (result.resolved_appendix().not_null()) {
693 // The resolved MemberName must not be accompanied by an appendix argument,
694 // since there is no way to bind this value into the MemberName.
695 // Caller is responsible to prevent this from happening.
696 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
697 }
698 oop mname2 = init_method_MemberName(mname, result);
699 return Handle(THREAD, mname2);
700 }
701 case IS_CONSTRUCTOR:
702 {
703 CallInfo result;
704 {
705 assert(!HAS_PENDING_EXCEPTION, "");
706 if (name == vmSymbols::object_initializer_name()) {
707 LinkResolver::resolve_special_call(result,
708 defc, name, type, caller, caller.not_null(), THREAD);
709 } else {
710 break; // will throw after end of switch
711 }
712 if (HAS_PENDING_EXCEPTION) {
713 return empty;
714 }
715 }
716 assert(result.is_statically_bound(), "");
717 oop mname2 = init_method_MemberName(mname, result);
718 return Handle(THREAD, mname2);
719 }
720 case IS_FIELD:
721 {
722 fieldDescriptor result; // find_field initializes fd if found
723 {
724 assert(!HAS_PENDING_EXCEPTION, "");
725 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD);
726 if (HAS_PENDING_EXCEPTION) {
727 return empty;
728 }
729 }
730 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
731 return Handle(THREAD, mname2);
732 }
733 default:
734 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
735 }
736
737 return empty;
738 }
739
740 // Conversely, a member name which is only initialized from JVM internals
741 // may have null defc, name, and type fields.
742 // Resolving it plants a vmtarget/vmindex in it,
743 // which refers directly to JVM internals.
744 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
745 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
746 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
747 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
748 if (vmtarget == NULL) {
749 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
750 }
751
752 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
753 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
754 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
755 int flags = java_lang_invoke_MemberName::flags(mname());
756
757 if (suppress != 0) {
758 if (suppress & _suppress_defc) have_defc = true;
759 if (suppress & _suppress_name) have_name = true;
760 if (suppress & _suppress_type) have_type = true;
761 }
762
763 if (have_defc && have_name && have_type) return; // nothing needed
764
765 switch (flags & ALL_KINDS) {
766 case IS_METHOD:
767 case IS_CONSTRUCTOR:
768 {
769 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
770 methodHandle m(THREAD, (Method*)vmtarget);
771 DEBUG_ONLY(vmtarget = NULL); // safety
772 if (m.is_null()) break;
773 if (!have_defc) {
774 InstanceKlass* defc = m->method_holder();
775 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
776 }
777 if (!have_name) {
778 //not java_lang_String::create_from_symbol; let's intern member names
779 Handle name = StringTable::intern(m->name(), CHECK);
780 java_lang_invoke_MemberName::set_name(mname(), name());
781 }
782 if (!have_type) {
783 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
784 java_lang_invoke_MemberName::set_type(mname(), type());
785 }
786 return;
787 }
788 case IS_FIELD:
789 {
790 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
791 if (!((Klass*) vmtarget)->oop_is_instance()) break;
792 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
793 DEBUG_ONLY(vmtarget = NULL); // safety
794 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
795 fieldDescriptor fd; // find_field initializes fd if found
796 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
797 break; // cannot expand
798 if (!have_defc) {
799 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
800 }
801 if (!have_name) {
802 //not java_lang_String::create_from_symbol; let's intern member names
803 Handle name = StringTable::intern(fd.name(), CHECK);
804 java_lang_invoke_MemberName::set_name(mname(), name());
805 }
806 if (!have_type) {
807 // If it is a primitive field type, don't mess with short strings like "I".
808 Handle type = field_signature_type_or_null(fd.signature());
809 if (type.is_null()) {
810 java_lang_String::create_from_symbol(fd.signature(), CHECK);
811 }
812 java_lang_invoke_MemberName::set_type(mname(), type());
813 }
814 return;
815 }
816 }
817 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
818 }
819
820 int MethodHandles::find_MemberNames(KlassHandle k,
821 Symbol* name, Symbol* sig,
822 int mflags, KlassHandle caller,
823 int skip, objArrayHandle results) {
824 // %%% take caller into account!
825
826 Thread* thread = Thread::current();
827
828 if (k.is_null() || !k->oop_is_instance()) return -1;
829
830 int rfill = 0, rlimit = results->length(), rskip = skip;
831 // overflow measurement:
832 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
833
834 int match_flags = mflags;
835 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
836 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
837 bool local_only = !(search_superc | search_intfc);
838 bool classes_only = false;
839
840 if (name != NULL) {
841 if (name->utf8_length() == 0) return 0; // a match is not possible
842 }
843 if (sig != NULL) {
844 if (sig->utf8_length() == 0) return 0; // a match is not possible
845 if (sig->byte_at(0) == '(')
846 match_flags &= ~(IS_FIELD | IS_TYPE);
847 else
848 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
849 }
850
851 if ((match_flags & IS_TYPE) != 0) {
852 // NYI, and Core Reflection works quite well for this query
853 }
854
855 if ((match_flags & IS_FIELD) != 0) {
856 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
857 if (name != NULL && st.name() != name)
858 continue;
859 if (sig != NULL && st.signature() != sig)
860 continue;
861 // passed the filters
862 if (rskip > 0) {
863 --rskip;
864 } else if (rfill < rlimit) {
865 Handle result(thread, results->obj_at(rfill++));
866 if (!java_lang_invoke_MemberName::is_instance(result()))
867 return -99; // caller bug!
868 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
869 if (saved != result())
870 results->obj_at_put(rfill-1, saved); // show saved instance to user
871 } else if (++overflow >= overflow_limit) {
872 match_flags = 0; break; // got tired of looking at overflow
873 }
874 }
875 }
876
877 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
878 // watch out for these guys:
879 Symbol* init_name = vmSymbols::object_initializer_name();
880 Symbol* clinit_name = vmSymbols::class_initializer_name();
881 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
882 bool negate_name_test = false;
883 // fix name so that it captures the intention of IS_CONSTRUCTOR
884 if (!(match_flags & IS_METHOD)) {
885 // constructors only
886 if (name == NULL) {
887 name = init_name;
888 } else if (name != init_name) {
889 return 0; // no constructors of this method name
890 }
891 } else if (!(match_flags & IS_CONSTRUCTOR)) {
892 // methods only
893 if (name == NULL) {
894 name = init_name;
895 negate_name_test = true; // if we see the name, we *omit* the entry
896 } else if (name == init_name) {
897 return 0; // no methods of this constructor name
898 }
899 } else {
900 // caller will accept either sort; no need to adjust name
901 }
902 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
903 Method* m = st.method();
904 Symbol* m_name = m->name();
905 if (m_name == clinit_name)
906 continue;
907 if (name != NULL && ((m_name != name) ^ negate_name_test))
908 continue;
909 if (sig != NULL && m->signature() != sig)
910 continue;
911 // passed the filters
912 if (rskip > 0) {
913 --rskip;
914 } else if (rfill < rlimit) {
915 Handle result(thread, results->obj_at(rfill++));
916 if (!java_lang_invoke_MemberName::is_instance(result()))
917 return -99; // caller bug!
918 CallInfo info(m);
919 oop saved = MethodHandles::init_method_MemberName(result, info);
920 if (saved != result())
921 results->obj_at_put(rfill-1, saved); // show saved instance to user
922 } else if (++overflow >= overflow_limit) {
923 match_flags = 0; break; // got tired of looking at overflow
924 }
925 }
926 }
927
928 // return number of elements we at leasted wanted to initialize
929 return rfill + overflow;
930 }
931
932 //------------------------------------------------------------------------------
933 // MemberNameTable
934 //
935
936 MemberNameTable::MemberNameTable(int methods_cnt)
937 : GrowableArray<jweak>(methods_cnt, true) {
938 assert_locked_or_safepoint(MemberNameTable_lock);
939 }
940
941 MemberNameTable::~MemberNameTable() {
942 assert_locked_or_safepoint(MemberNameTable_lock);
943 int len = this->length();
944
945 for (int idx = 0; idx < len; idx++) {
946 jweak ref = this->at(idx);
947 JNIHandles::destroy_weak_global(ref);
948 }
949 }
950
951 void MemberNameTable::add_member_name(jweak mem_name_wref) {
952 assert_locked_or_safepoint(MemberNameTable_lock);
953 this->push(mem_name_wref);
954 }
955
956 #if INCLUDE_JVMTI
957 // It is called at safepoint only for RedefineClasses
958 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
959 int methods_length, bool *trace_name_printed) {
960 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
961 // For each redefined method
962 for (int j = 0; j < methods_length; j++) {
963 Method* old_method = old_methods[j];
964 Method* new_method = new_methods[j];
965
966 // search the MemberNameTable for uses of either obsolete or EMCP methods
967 for (int idx = 0; idx < length(); idx++) {
968 oop mem_name = JNIHandles::resolve(this->at(idx));
969 if (mem_name != NULL) {
970 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, old_method, new_method,
971 trace_name_printed);
972 }
973 }
974 }
975 }
976 #endif // INCLUDE_JVMTI
977
978 //
979 // Here are the native methods in java.lang.invoke.MethodHandleNatives
980 // They are the private interface between this JVM and the HotSpot-specific
981 // Java code that implements JSR 292 method handles.
982 //
983 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
984 // that intrinsic (non-JNI) native methods are defined in HotSpot.
985 //
986
987 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
988 switch (which) {
989 case MethodHandles::GC_COUNT_GWT:
990 #ifdef COMPILER2
991 return true;
992 #else
993 return false;
994 #endif
995 }
996 return 0;
997 }
998 JVM_END
999
1000 #ifndef PRODUCT
1001 #define EACH_NAMED_CON(template, requirement) \
1002 template(MethodHandles,GC_COUNT_GWT) \
1003 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1004 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1005 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1006 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1007 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1008 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1009 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1010 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1011 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1012 template(MethodHandles,GC_LAMBDA_SUPPORT) \
1013 /*end*/
1014
1015 #define IGNORE_REQ(req_expr) /* req_expr */
1016 #define ONE_PLUS(scope,value) 1+
1017 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1018 #define VALUE_COMMA(scope,value) scope::value,
1019 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1020 #define STRING_NULL(scope,value) #value "\0"
1021 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1022
1023 static bool advertise_con_value(int which) {
1024 if (which < 0) return false;
1025 bool ok = true;
1026 int count = 0;
1027 #define INC_COUNT(scope,value) \
1028 ++count;
1029 #define CHECK_REQ(req_expr) \
1030 if (which < count) return ok; \
1031 ok = (req_expr);
1032 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1033 #undef INC_COUNT
1034 #undef CHECK_REQ
1035 assert(count == con_value_count, "");
1036 if (which < count) return ok;
1037 return false;
1038 }
1039
1040 #undef ONE_PLUS
1041 #undef VALUE_COMMA
1042 #undef STRING_NULL
1043 #undef EACH_NAMED_CON
1044 #endif // PRODUCT
1045
1046 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1047 #ifndef PRODUCT
1048 if (advertise_con_value(which)) {
1049 assert(which >= 0 && which < con_value_count, "");
1050 int con = con_values[which];
1051 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1052 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1053 const char* str = &con_names[0];
1054 for (int i = 0; i < which; i++)
1055 str += strlen(str) + 1; // skip name and null
1056 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1057 box->obj_at_put(0, name);
1058 }
1059 return con;
1060 }
1061 #endif
1062 return 0;
1063 }
1064 JVM_END
1065
1066 // void init(MemberName self, AccessibleObject ref)
1067 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1068 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1069 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1070 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1071 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1072 MethodHandles::init_MemberName(mname, target);
1073 }
1074 JVM_END
1075
1076 // void expand(MemberName self)
1077 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1078 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1079 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1080 MethodHandles::expand_MemberName(mname, 0, CHECK);
1081 }
1082 JVM_END
1083
1084 // void resolve(MemberName self, Class<?> caller)
1085 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1086 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1087 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1088
1089 // The trusted Java code that calls this method should already have performed
1090 // access checks on behalf of the given caller. But, we can verify this.
1091 if (VerifyMethodHandles && caller_jh != NULL &&
1092 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1093 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1094 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1095 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1096 }
1097
1098 // Reflection::verify_class_access can only handle instance classes.
1099 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1100 // Emulate LinkResolver::check_klass_accessability.
1101 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1102 if (!Reflection::verify_class_access(caller,
1103 reference_klass,
1104 true)) {
1105 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1106 }
1107 }
1108 }
1109
1110 KlassHandle caller(THREAD,
1111 caller_jh == NULL ? (Klass*) NULL :
1112 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1113 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1114
1115 if (resolved.is_null()) {
1116 int flags = java_lang_invoke_MemberName::flags(mname());
1117 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1118 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1119 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1120 }
1121 if ((flags & ALL_KINDS) == IS_FIELD) {
1122 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1123 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1124 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1125 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1126 } else {
1127 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1128 }
1129 }
1130
1131 return JNIHandles::make_local(THREAD, resolved());
1132 }
1133 JVM_END
1134
1135 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1136 if (mname == NULL ||
1137 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1138 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1139 } else {
1140 int flags = java_lang_invoke_MemberName::flags(mname);
1141 if ((flags & IS_FIELD) != 0 &&
1142 (must_be_static
1143 ? (flags & JVM_ACC_STATIC) != 0
1144 : (flags & JVM_ACC_STATIC) == 0)) {
1145 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1146 return (jlong) vmindex;
1147 }
1148 }
1149 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1150 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1151 return 0;
1152 }
1153
1154 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1155 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1156 }
1157 JVM_END
1158
1159 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1160 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1161 }
1162 JVM_END
1163
1164 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1165 // use the other function to perform sanity checks:
1166 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1167 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1168 return JNIHandles::make_local(THREAD, clazz);
1169 }
1170 JVM_END
1171
1172 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1173 if (mname_jh == NULL) return NULL;
1174 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1175 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1176 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1177 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1178 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1179 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1180 result->obj_at_put(0, x);
1181 x = NULL;
1182 if (vmtarget == NULL) {
1183 x = NULL;
1184 } else if (vmtarget->is_klass()) {
1185 x = ((Klass*) vmtarget)->java_mirror();
1186 } else if (vmtarget->is_method()) {
1187 x = mname();
1188 }
1189 result->obj_at_put(1, x);
1190 return JNIHandles::make_local(env, result());
1191 }
1192 JVM_END
1193
1194
1195
1196 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1197 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1198 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1199 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1200 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1201 if (clazz_jh == NULL || results_jh == NULL) return -1;
1202 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1203
1204 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1205 if (results.is_null() || !results->is_objArray()) return -1;
1206
1207 TempNewSymbol name = NULL;
1208 TempNewSymbol sig = NULL;
1209 if (name_jh != NULL) {
1210 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1211 if (name == NULL) return 0; // a match is not possible
1212 }
1213 if (sig_jh != NULL) {
1214 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1215 if (sig == NULL) return 0; // a match is not possible
1216 }
1217
1218 KlassHandle caller;
1219 if (caller_jh != NULL) {
1220 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1221 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1222 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1223 }
1224
1225 if (name != NULL && sig != NULL && results.not_null()) {
1226 // try a direct resolve
1227 // %%% TO DO
1228 }
1229
1230 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1231 caller, skip, results);
1232 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1233 return res;
1234 }
1235 JVM_END
1236
1237 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1238 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1239 Handle target (THREAD, JNIHandles::resolve(target_jh));
1240 {
1241 // Walk all nmethods depending on this call site.
1242 MutexLocker mu(Compile_lock, thread);
1243 Universe::flush_dependents_on(call_site, target);
1244 java_lang_invoke_CallSite::set_target(call_site(), target());
1245 }
1246 }
1247 JVM_END
1248
1249 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1250 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1251 Handle target (THREAD, JNIHandles::resolve(target_jh));
1252 {
1253 // Walk all nmethods depending on this call site.
1254 MutexLocker mu(Compile_lock, thread);
1255 Universe::flush_dependents_on(call_site, target);
1256 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1257 }
1258 }
1259 JVM_END
1260
1261 /**
1262 * Throws a java/lang/UnsupportedOperationException unconditionally.
1263 * This is required by the specification of MethodHandle.invoke if
1264 * invoked directly.
1265 */
1266 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1267 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1268 return NULL;
1269 }
1270 JVM_END
1271
1272 /**
1273 * Throws a java/lang/UnsupportedOperationException unconditionally.
1274 * This is required by the specification of MethodHandle.invokeExact if
1275 * invoked directly.
1276 */
1277 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1278 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1279 return NULL;
1280 }
1281 JVM_END
1282
1283 /// JVM_RegisterMethodHandleMethods
1284
1285 #undef CS // Solaris builds complain
1286
1287 #define LANG "Ljava/lang/"
1288 #define JLINV "Ljava/lang/invoke/"
1289
1290 #define OBJ LANG"Object;"
1291 #define CLS LANG"Class;"
1292 #define STRG LANG"String;"
1293 #define CS JLINV"CallSite;"
1294 #define MT JLINV"MethodType;"
1295 #define MH JLINV"MethodHandle;"
1296 #define MEM JLINV"MemberName;"
1297
1298 #define CC (char*) /*cast a literal from (const char*)*/
1299 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1300
1301 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1302 static JNINativeMethod MHN_methods[] = {
1303 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1304 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1305 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1306 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1307 // static native int getNamedCon(int which, Object[] name)
1308 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1309 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1310 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1311 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1312 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1313 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1314 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1315 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1316 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1317 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1318 };
1319
1320 static JNINativeMethod MH_methods[] = {
1321 // UnsupportedOperationException throwers
1322 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1323 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1324 };
1325
1326 /**
1327 * Helper method to register native methods.
1328 */
1329 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1330 int status = env->RegisterNatives(clazz, methods, nMethods);
1331 if (status != JNI_OK || env->ExceptionOccurred()) {
1332 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1333 env->ExceptionClear();
1334 return false;
1335 }
1336 return true;
1337 }
1338
1339 /**
1340 * This one function is exported, used by NativeLookup.
1341 */
1342 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1343 if (!EnableInvokeDynamic) {
1344 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
1345 return; // bind nothing
1346 }
1347
1348 assert(!MethodHandles::enabled(), "must not be enabled");
1349 bool enable_MH = true;
1350
1351 jclass MH_class = NULL;
1352 if (SystemDictionary::MethodHandle_klass() == NULL) {
1353 enable_MH = false;
1354 } else {
1355 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1356 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1357 }
1358
1359 if (enable_MH) {
1360 ThreadToNativeFromVM ttnfv(thread);
1361
1362 if (enable_MH) {
1363 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1364 }
1365 if (enable_MH) {
1366 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1367 }
1368 }
1369
1370 if (TraceInvokeDynamic) {
1371 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1372 }
1373
1374 if (enable_MH) {
1375 MethodHandles::generate_adapters();
1376 MethodHandles::set_enabled(true);
1377 }
1378 }
1379 JVM_END