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 KlassHandle m_klass = m->method_holder();
189 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
190 int vmindex = Method::invalid_vtable_index;
191
192 switch (info.call_kind()) {
193 case CallInfo::itable_call:
194 vmindex = info.itable_index();
195 // More importantly, the itable index only works with the method holder.
196 assert(m_klass->verify_itable_index(vmindex), "");
197 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
198 if (TraceInvokeDynamic) {
199 ResourceMark rm;
200 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
201 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
202 vmindex);
203 m->access_flags().print_on(tty);
204 if (!m->is_abstract()) {
205 tty->print("default");
206 }
207 tty->cr();
208 }
209 break;
210
211 case CallInfo::vtable_call:
212 vmindex = info.vtable_index();
213 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
214 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
215 if (m_klass->is_interface()) {
216 // This is a vtable call to an interface method (abstract "miranda method" or default method).
217 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
218 // (LinkResolver should help us figure this out.)
219 KlassHandle m_klass_non_interface = info.resolved_klass();
220 if (m_klass_non_interface->is_interface()) {
221 m_klass_non_interface = SystemDictionary::Object_klass();
222 #ifdef ASSERT
223 { ResourceMark rm;
224 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
225 assert(m->name() == m2->name() && m->signature() == m2->signature(),
226 err_msg("at %d, %s != %s", vmindex,
227 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
228 }
229 #endif //ASSERT
230 }
231 if (!m->is_public()) {
232 assert(m->is_public(), "virtual call must be to public interface method");
233 return NULL; // elicit an error later in product build
234 }
235 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
236 m_klass = m_klass_non_interface;
237 }
238 if (TraceInvokeDynamic) {
239 ResourceMark rm;
240 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
241 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
242 m_klass->internal_name(), vmindex);
243 m->access_flags().print_on(tty);
244 if (m->is_default_method()) {
245 tty->print("default");
246 }
247 tty->cr();
248 }
249 break;
250
251 case CallInfo::direct_call:
252 vmindex = Method::nonvirtual_vtable_index;
253 if (m->is_static()) {
254 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
255 } else if (m->is_initializer()) {
256 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
257 } else {
258 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
259 }
260 break;
261
262 default: assert(false, "bad CallInfo"); return NULL;
263 }
264
265 // @CallerSensitive annotation detected
266 if (m->caller_sensitive()) {
267 flags |= CALLER_SENSITIVE;
268 }
269
270 oop mname_oop = mname();
271 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
272 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
273 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
274 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
275 // Note: name and type can be lazily computed by resolve_MemberName,
276 // if Java code needs them as resolved String and MethodType objects.
277 // The clazz must be eagerly stored, because it provides a GC
278 // root to help keep alive the Method*.
279 // If relevant, the vtable or itable value is stored as vmindex.
280 // This is done eagerly, since it is readily available without
281 // constructing any new objects.
282 // TO DO: maybe intern mname_oop
283 if (m->method_holder()->add_member_name(mname)) {
284 return mname();
285 } else {
286 // Redefinition caused this to fail. Return NULL (and an exception?)
287 return NULL;
288 }
289 }
290
291 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
292 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
293 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
294 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
295 Metadata* vmtarget = fd.field_holder();
296 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
297 oop mname_oop = mname();
298 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
299 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
300 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
301 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
302 oop type = field_signature_type_or_null(fd.signature());
303 oop name = field_name_or_null(fd.name());
304 if (name != NULL)
305 java_lang_invoke_MemberName::set_name(mname_oop, name);
306 if (type != NULL)
307 java_lang_invoke_MemberName::set_type(mname_oop, type);
308 // Note: name and type can be lazily computed by resolve_MemberName,
309 // if Java code needs them as resolved String and Class objects.
310 // Note that the incoming type oop might be pre-resolved (non-null).
311 // The base clazz and field offset (vmindex) must be eagerly stored,
312 // because they unambiguously identify the field.
313 // Although the fieldDescriptor::_index would also identify the field,
314 // we do not use it, because it is harder to decode.
315 // TO DO: maybe intern mname_oop
316 return mname();
317 }
318
319 // JVM 2.9 Special Methods:
320 // A method is signature polymorphic if and only if all of the following conditions hold :
321 // * It is declared in the java.lang.invoke.MethodHandle class.
322 // * It has a single formal parameter of type Object[].
323 // * It has a return type of Object.
324 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
325 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
326 if (klass == NULL)
327 return false;
328 // The following test will fail spuriously during bootstrap of MethodHandle itself:
329 // if (klass != SystemDictionary::MethodHandle_klass())
330 // Test the name instead:
331 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
332 return false;
333 Symbol* poly_sig = vmSymbols::object_array_object_signature();
334 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
335 if (m == NULL) return false;
336 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
337 int flags = m->access_flags().as_int();
338 return (flags & required) == required;
339 }
340
341
342 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
343 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
344 switch (iid) {
345 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
346 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
347 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
348 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
349 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
350 }
351 assert(false, "");
352 return 0;
353 }
354
355 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
356 switch (iid) {
357 case vmIntrinsics::_invokeBasic: return 0;
358 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
359 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
360 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
361 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
362 }
363 assert(false, err_msg("iid=%d", iid));
364 return 0;
365 }
366
367 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
368 vmSymbols::SID name_id = vmSymbols::find_sid(name);
369 switch (name_id) {
370 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
371 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
372 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
373 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
374
375 // There is one static signature-polymorphic method for each JVM invocation mode.
376 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
377 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
378 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
379 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
380 }
381
382 // Cover the case of invokeExact and any future variants of invokeFoo.
383 Klass* mh_klass = SystemDictionary::well_known_klass(
384 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
385 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
386 return vmIntrinsics::_invokeGeneric;
387
388 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
389 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
390 return vmIntrinsics::_none;
391 }
392
393 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
394 if (klass != NULL &&
395 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
396 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
397 if (iid != vmIntrinsics::_none)
398 return iid;
399 if (is_method_handle_invoke_name(klass, name))
400 return vmIntrinsics::_invokeGeneric;
401 }
402 return vmIntrinsics::_none;
403 }
404
405
406 // convert the external string or reflective type to an internal signature
407 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
408 if (java_lang_invoke_MethodType::is_instance(type_str)) {
409 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
410 } else if (java_lang_Class::is_instance(type_str)) {
411 return java_lang_Class::as_signature(type_str, false, THREAD);
412 } else if (java_lang_String::is_instance_inlined(type_str)) {
413 if (intern_if_not_found) {
414 return java_lang_String::as_symbol(type_str, THREAD);
415 } else {
416 return java_lang_String::as_symbol_or_null(type_str);
417 }
418 } else {
419 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
420 }
421 }
422
423 static const char OBJ_SIG[] = "Ljava/lang/Object;";
424 enum { OBJ_SIG_LEN = 18 };
425
426 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
427 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
428 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
429 const int len = sig->utf8_length();
430 for (int i = 0; i < len; i++) {
431 switch (sig->byte_at(i)) {
432 case 'L':
433 // only java/lang/Object is valid here
434 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
435 return false;
436 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
437 continue;
438 case '(': case ')': case 'V':
439 case 'I': case 'J': case 'F': case 'D':
440 continue;
441 //case '[':
442 //case 'Z': case 'B': case 'C': case 'S':
443 default:
444 return false;
445 }
446 }
447 return true;
448 }
449
450 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
451 Symbol* bsig = NULL;
452 if (sig == NULL) {
453 return sig;
454 } else if (is_basic_type_signature(sig)) {
455 sig->increment_refcount();
456 return sig; // that was easy
457 } else if (sig->byte_at(0) != '(') {
458 BasicType bt = char2type(sig->byte_at(0));
459 if (is_subword_type(bt)) {
460 bsig = vmSymbols::int_signature();
461 } else {
462 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
463 bsig = vmSymbols::object_signature();
464 }
465 } else {
466 ResourceMark rm;
467 stringStream buffer(128);
468 buffer.put('(');
469 int arg_pos = 0, keep_arg_pos = -1;
470 if (keep_last_arg)
471 keep_arg_pos = ArgumentCount(sig).size() - 1;
472 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
473 BasicType bt = ss.type();
474 size_t this_arg_pos = buffer.size();
475 if (ss.at_return_type()) {
476 buffer.put(')');
477 }
478 if (arg_pos == keep_arg_pos) {
479 buffer.write((char*) ss.raw_bytes(),
480 (int) ss.raw_length());
481 } else if (bt == T_OBJECT || bt == T_ARRAY) {
482 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
483 } else {
484 if (is_subword_type(bt))
485 bt = T_INT;
486 buffer.put(type2char(bt));
487 }
488 arg_pos++;
489 }
490 const char* sigstr = buffer.base();
491 int siglen = (int) buffer.size();
492 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
493 }
494 assert(is_basic_type_signature(bsig) ||
495 // detune assert in case the injected argument is not a basic type:
496 keep_last_arg, "");
497 return bsig;
498 }
499
500 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
501 Symbol* sig,
502 bool keep_arrays,
503 bool keep_basic_names) {
504 st = st ? st : tty;
505 int len = sig->utf8_length();
506 int array = 0;
507 bool prev_type = false;
508 for (int i = 0; i < len; i++) {
509 char ch = sig->byte_at(i);
510 switch (ch) {
511 case '(': case ')':
512 prev_type = false;
513 st->put(ch);
514 continue;
515 case '[':
516 if (!keep_basic_names && keep_arrays)
517 st->put(ch);
518 array++;
519 continue;
520 case 'L':
521 {
522 if (prev_type) st->put(',');
523 int start = i+1, slash = start;
524 while (++i < len && (ch = sig->byte_at(i)) != ';') {
525 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
526 }
527 if (slash < i) start = slash;
528 if (!keep_basic_names) {
529 st->put('L');
530 } else {
531 for (int j = start; j < i; j++)
532 st->put(sig->byte_at(j));
533 prev_type = true;
534 }
535 break;
536 }
537 default:
538 {
539 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
540 ch = '[';
541 array = 0;
542 }
543 if (prev_type) st->put(',');
544 const char* n = NULL;
545 if (keep_basic_names)
546 n = type2name(char2type(ch));
547 if (n == NULL) {
548 // unknown letter, or we don't want to know its name
549 st->put(ch);
550 } else {
551 st->print("%s", n);
552 prev_type = true;
553 }
554 break;
555 }
556 }
557 // Switch break goes here to take care of array suffix:
558 if (prev_type) {
559 while (array > 0) {
560 st->print("[]");
561 --array;
562 }
563 }
564 array = 0;
565 }
566 }
567
568
569
570 static oop object_java_mirror() {
571 return SystemDictionary::Object_klass()->java_mirror();
572 }
573
574 oop MethodHandles::field_name_or_null(Symbol* s) {
575 if (s == NULL) return NULL;
576 return StringTable::lookup(s);
577 }
578
579 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
580 if (s == NULL) return NULL;
581 BasicType bt = FieldType::basic_type(s);
582 if (is_java_primitive(bt)) {
583 assert(s->utf8_length() == 1, "");
584 return java_lang_Class::primitive_mirror(bt);
585 }
586 // Here are some more short cuts for common types.
587 // They are optional, since reference types can be resolved lazily.
588 if (bt == T_OBJECT) {
589 if (s == vmSymbols::object_signature()) {
590 return object_java_mirror();
591 } else if (s == vmSymbols::class_signature()) {
592 return SystemDictionary::Class_klass()->java_mirror();
593 } else if (s == vmSymbols::string_signature()) {
594 return SystemDictionary::String_klass()->java_mirror();
595 }
596 }
597 return NULL;
598 }
599
600
601 // An unresolved member name is a mere symbolic reference.
602 // Resolving it plants a vmtarget/vmindex in it,
603 // which refers directly to JVM internals.
604 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
605 Handle empty;
606 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
607
608 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
609 // Already resolved.
610 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
611 assert(vmindex >= Method::nonvirtual_vtable_index, "");
612 return mname;
613 }
614
615 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
616 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
617 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
618 int flags = java_lang_invoke_MemberName::flags(mname());
619 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
620 if (!ref_kind_is_valid(ref_kind)) {
621 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
622 }
623
624 DEBUG_ONLY(int old_vmindex);
625 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
626
627 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
628 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
629 }
630
631 instanceKlassHandle defc;
632 {
633 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
634 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
635 if (!defc_klass->oop_is_instance()) {
636 if (!defc_klass->oop_is_array()) return empty;
637 defc_klass = SystemDictionary::Object_klass();
638 }
639 defc = instanceKlassHandle(THREAD, defc_klass);
640 }
641 if (defc.is_null()) {
642 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
643 }
644 defc->link_class(CHECK_(empty)); // possible safepoint
645
646 // convert the external string name to an internal symbol
647 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
648 if (name == NULL) return empty; // no such name
649 if (name == vmSymbols::class_initializer_name())
650 return empty; // illegal name
651
652 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
653 if ((flags & ALL_KINDS) == IS_METHOD &&
654 (defc() == SystemDictionary::MethodHandle_klass()) &&
655 (ref_kind == JVM_REF_invokeVirtual ||
656 ref_kind == JVM_REF_invokeSpecial ||
657 // static invocation mode is required for _linkToVirtual, etc.:
658 ref_kind == JVM_REF_invokeStatic)) {
659 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
660 if (iid != vmIntrinsics::_none &&
661 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
662 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
663 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
664 mh_invoke_id = iid;
665 }
666 }
667
668 // convert the external string or reflective type to an internal signature
669 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
670 if (type == NULL) return empty; // no such signature exists in the VM
671
672 // Time to do the lookup.
673 switch (flags & ALL_KINDS) {
674 case IS_METHOD:
675 {
676 CallInfo result;
677 {
678 assert(!HAS_PENDING_EXCEPTION, "");
679 if (ref_kind == JVM_REF_invokeStatic) {
680 LinkResolver::resolve_static_call(result,
681 defc, name, type, caller, caller.not_null(), false, THREAD);
682 } else if (ref_kind == JVM_REF_invokeInterface) {
683 LinkResolver::resolve_interface_call(result, Handle(), defc,
684 defc, name, type, caller, caller.not_null(), false, THREAD);
685 } else if (mh_invoke_id != vmIntrinsics::_none) {
686 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
687 LinkResolver::resolve_handle_call(result,
688 defc, name, type, caller, THREAD);
689 } else if (ref_kind == JVM_REF_invokeSpecial) {
690 LinkResolver::resolve_special_call(result,
691 defc, name, type, caller, caller.not_null(), THREAD);
692 } else if (ref_kind == JVM_REF_invokeVirtual) {
693 LinkResolver::resolve_virtual_call(result, Handle(), defc,
694 defc, name, type, caller, caller.not_null(), false, THREAD);
695 } else {
696 assert(false, err_msg("ref_kind=%d", ref_kind));
697 }
698 if (HAS_PENDING_EXCEPTION) {
699 return empty;
700 }
701 }
702 if (result.resolved_appendix().not_null()) {
703 // The resolved MemberName must not be accompanied by an appendix argument,
704 // since there is no way to bind this value into the MemberName.
705 // Caller is responsible to prevent this from happening.
706 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
707 }
708 oop mname2 = init_method_MemberName(mname, result);
709 return Handle(THREAD, mname2);
710 }
711 case IS_CONSTRUCTOR:
712 {
713 CallInfo result;
714 {
715 assert(!HAS_PENDING_EXCEPTION, "");
716 if (name == vmSymbols::object_initializer_name()) {
717 LinkResolver::resolve_special_call(result,
718 defc, name, type, caller, caller.not_null(), THREAD);
719 } else {
720 break; // will throw after end of switch
721 }
722 if (HAS_PENDING_EXCEPTION) {
723 return empty;
724 }
725 }
726 assert(result.is_statically_bound(), "");
727 oop mname2 = init_method_MemberName(mname, result);
728 return Handle(THREAD, mname2);
729 }
730 case IS_FIELD:
731 {
732 fieldDescriptor result; // find_field initializes fd if found
733 {
734 assert(!HAS_PENDING_EXCEPTION, "");
735 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD);
736 if (HAS_PENDING_EXCEPTION) {
737 return empty;
738 }
739 }
740 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
741 return Handle(THREAD, mname2);
742 }
743 default:
744 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
745 }
746
747 return empty;
748 }
749
750 // Conversely, a member name which is only initialized from JVM internals
751 // may have null defc, name, and type fields.
752 // Resolving it plants a vmtarget/vmindex in it,
753 // which refers directly to JVM internals.
754 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
755 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
756 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
757 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
758 if (vmtarget == NULL) {
759 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
760 }
761
762 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
763 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
764 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
765 int flags = java_lang_invoke_MemberName::flags(mname());
766
767 if (suppress != 0) {
768 if (suppress & _suppress_defc) have_defc = true;
769 if (suppress & _suppress_name) have_name = true;
770 if (suppress & _suppress_type) have_type = true;
771 }
772
773 if (have_defc && have_name && have_type) return; // nothing needed
774
775 switch (flags & ALL_KINDS) {
776 case IS_METHOD:
777 case IS_CONSTRUCTOR:
778 {
779 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
780 methodHandle m(THREAD, (Method*)vmtarget);
781 DEBUG_ONLY(vmtarget = NULL); // safety
782 if (m.is_null()) break;
783 if (!have_defc) {
784 InstanceKlass* defc = m->method_holder();
785 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
786 }
787 if (!have_name) {
788 //not java_lang_String::create_from_symbol; let's intern member names
789 Handle name = StringTable::intern(m->name(), CHECK);
790 java_lang_invoke_MemberName::set_name(mname(), name());
791 }
792 if (!have_type) {
793 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
794 java_lang_invoke_MemberName::set_type(mname(), type());
795 }
796 return;
797 }
798 case IS_FIELD:
799 {
800 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
801 if (!((Klass*) vmtarget)->oop_is_instance()) break;
802 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
803 DEBUG_ONLY(vmtarget = NULL); // safety
804 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
805 fieldDescriptor fd; // find_field initializes fd if found
806 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
807 break; // cannot expand
808 if (!have_defc) {
809 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
810 }
811 if (!have_name) {
812 //not java_lang_String::create_from_symbol; let's intern member names
813 Handle name = StringTable::intern(fd.name(), CHECK);
814 java_lang_invoke_MemberName::set_name(mname(), name());
815 }
816 if (!have_type) {
817 // If it is a primitive field type, don't mess with short strings like "I".
818 Handle type = field_signature_type_or_null(fd.signature());
819 if (type.is_null()) {
820 java_lang_String::create_from_symbol(fd.signature(), CHECK);
821 }
822 java_lang_invoke_MemberName::set_type(mname(), type());
823 }
824 return;
825 }
826 }
827 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
828 }
829
830 int MethodHandles::find_MemberNames(KlassHandle k,
831 Symbol* name, Symbol* sig,
832 int mflags, KlassHandle caller,
833 int skip, objArrayHandle results) {
834 // %%% take caller into account!
835
836 Thread* thread = Thread::current();
837
838 if (k.is_null() || !k->oop_is_instance()) return -1;
839
840 int rfill = 0, rlimit = results->length(), rskip = skip;
841 // overflow measurement:
842 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
843
844 int match_flags = mflags;
845 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
846 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
847 bool local_only = !(search_superc | search_intfc);
848 bool classes_only = false;
849
850 if (name != NULL) {
851 if (name->utf8_length() == 0) return 0; // a match is not possible
852 }
853 if (sig != NULL) {
854 if (sig->utf8_length() == 0) return 0; // a match is not possible
855 if (sig->byte_at(0) == '(')
856 match_flags &= ~(IS_FIELD | IS_TYPE);
857 else
858 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
859 }
860
861 if ((match_flags & IS_TYPE) != 0) {
862 // NYI, and Core Reflection works quite well for this query
863 }
864
865 if ((match_flags & IS_FIELD) != 0) {
866 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
867 if (name != NULL && st.name() != name)
868 continue;
869 if (sig != NULL && st.signature() != sig)
870 continue;
871 // passed the filters
872 if (rskip > 0) {
873 --rskip;
874 } else if (rfill < rlimit) {
875 Handle result(thread, results->obj_at(rfill++));
876 if (!java_lang_invoke_MemberName::is_instance(result()))
877 return -99; // caller bug!
878 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
879 if (saved != result())
880 results->obj_at_put(rfill-1, saved); // show saved instance to user
881 } else if (++overflow >= overflow_limit) {
882 match_flags = 0; break; // got tired of looking at overflow
883 }
884 }
885 }
886
887 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
888 // watch out for these guys:
889 Symbol* init_name = vmSymbols::object_initializer_name();
890 Symbol* clinit_name = vmSymbols::class_initializer_name();
891 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
892 bool negate_name_test = false;
893 // fix name so that it captures the intention of IS_CONSTRUCTOR
894 if (!(match_flags & IS_METHOD)) {
895 // constructors only
896 if (name == NULL) {
897 name = init_name;
898 } else if (name != init_name) {
899 return 0; // no constructors of this method name
900 }
901 } else if (!(match_flags & IS_CONSTRUCTOR)) {
902 // methods only
903 if (name == NULL) {
904 name = init_name;
905 negate_name_test = true; // if we see the name, we *omit* the entry
906 } else if (name == init_name) {
907 return 0; // no methods of this constructor name
908 }
909 } else {
910 // caller will accept either sort; no need to adjust name
911 }
912 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
913 Method* m = st.method();
914 Symbol* m_name = m->name();
915 if (m_name == clinit_name)
916 continue;
917 if (name != NULL && ((m_name != name) ^ negate_name_test))
918 continue;
919 if (sig != NULL && m->signature() != sig)
920 continue;
921 // passed the filters
922 if (rskip > 0) {
923 --rskip;
924 } else if (rfill < rlimit) {
925 Handle result(thread, results->obj_at(rfill++));
926 if (!java_lang_invoke_MemberName::is_instance(result()))
927 return -99; // caller bug!
928 CallInfo info(m);
929 oop saved = MethodHandles::init_method_MemberName(result, info);
930 if (saved != result())
931 results->obj_at_put(rfill-1, saved); // show saved instance to user
932 } else if (++overflow >= overflow_limit) {
933 match_flags = 0; break; // got tired of looking at overflow
934 }
935 }
936 }
937
938 // return number of elements we at leasted wanted to initialize
939 return rfill + overflow;
940 }
941
942 // Get context class for a CallSite instance: either extract existing context or use default one.
943 InstanceKlass* MethodHandles::get_call_site_context(oop call_site) {
944 assert_locked_or_safepoint(Compile_lock);
945 assert(java_lang_invoke_CallSite::is_instance(call_site), "");
946 oop context_oop = java_lang_invoke_CallSite::context_volatile(call_site);
947 if (oopDesc::is_null(context_oop)) {
948 return NULL; // The context hasn't been initialized yet.
949 }
950 if (java_lang_invoke_DependencyContext::is_default_context(context_oop)) {
951 // Extract context klass from call site target when default context is used.
952 oop mh = java_lang_invoke_CallSite::target(call_site);
953 oop lform = java_lang_invoke_MethodHandle::form(mh);
954 oop mname = java_lang_invoke_LambdaForm::vmentry(lform);
955 oop clazz = java_lang_invoke_MemberName::clazz(mname);
956 return InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
957 } else {
958 // In order to extract a context the following traversal is performed:
959 // DependencyContext.cleaner => Cleaner.referent => Class._klass => Klass
960 oop cleaner_oop = java_lang_invoke_DependencyContext::cleaner(context_oop);
961 oop context_class_oop = java_lang_ref_Reference::referent(cleaner_oop);
962 if (oopDesc::is_null(context_class_oop)) {
963 // The context reference was cleared by GC, so current DependencyContext instance
964 // isn't usable anymore. Context should be fetched from CallSite again.
965 return NULL;
966 }
967 return InstanceKlass::cast(java_lang_Class::as_Klass(context_class_oop));
968 }
969 }
970
971 //------------------------------------------------------------------------------
972 // MemberNameTable
973 //
974
975 MemberNameTable::MemberNameTable(int methods_cnt)
976 : GrowableArray<jweak>(methods_cnt, true) {
977 assert_locked_or_safepoint(MemberNameTable_lock);
978 }
979
980 MemberNameTable::~MemberNameTable() {
981 assert_locked_or_safepoint(MemberNameTable_lock);
982 int len = this->length();
983
984 for (int idx = 0; idx < len; idx++) {
985 jweak ref = this->at(idx);
986 JNIHandles::destroy_weak_global(ref);
987 }
988 }
989
990 void MemberNameTable::add_member_name(jweak mem_name_wref) {
991 assert_locked_or_safepoint(MemberNameTable_lock);
992 this->push(mem_name_wref);
993 }
994
995 #if INCLUDE_JVMTI
996 // It is called at safepoint only for RedefineClasses
997 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
998 int methods_length, bool *trace_name_printed) {
999 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
1000 // For each redefined method
1001 for (int j = 0; j < methods_length; j++) {
1002 Method* old_method = old_methods[j];
1003 Method* new_method = new_methods[j];
1004
1005 // search the MemberNameTable for uses of either obsolete or EMCP methods
1006 for (int idx = 0; idx < length(); idx++) {
1007 oop mem_name = JNIHandles::resolve(this->at(idx));
1008 if (mem_name != NULL) {
1009 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, old_method, new_method,
1010 trace_name_printed);
1011 }
1012 }
1013 }
1014 }
1015 #endif // INCLUDE_JVMTI
1016
1017 //
1018 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1019 // They are the private interface between this JVM and the HotSpot-specific
1020 // Java code that implements JSR 292 method handles.
1021 //
1022 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1023 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1024 //
1025
1026 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
1027 switch (which) {
1028 case MethodHandles::GC_COUNT_GWT:
1029 #ifdef COMPILER2
1030 return true;
1031 #else
1032 return false;
1033 #endif
1034 }
1035 return 0;
1036 }
1037 JVM_END
1038
1039 #ifndef PRODUCT
1040 #define EACH_NAMED_CON(template, requirement) \
1041 template(MethodHandles,GC_COUNT_GWT) \
1042 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1043 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1044 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1045 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1046 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1047 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1048 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1049 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1050 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1051 template(MethodHandles,GC_LAMBDA_SUPPORT) \
1052 /*end*/
1053
1054 #define IGNORE_REQ(req_expr) /* req_expr */
1055 #define ONE_PLUS(scope,value) 1+
1056 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1057 #define VALUE_COMMA(scope,value) scope::value,
1058 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1059 #define STRING_NULL(scope,value) #value "\0"
1060 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1061
1062 static bool advertise_con_value(int which) {
1063 if (which < 0) return false;
1064 bool ok = true;
1065 int count = 0;
1066 #define INC_COUNT(scope,value) \
1067 ++count;
1068 #define CHECK_REQ(req_expr) \
1069 if (which < count) return ok; \
1070 ok = (req_expr);
1071 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1072 #undef INC_COUNT
1073 #undef CHECK_REQ
1074 assert(count == con_value_count, "");
1075 if (which < count) return ok;
1076 return false;
1077 }
1078
1079 #undef ONE_PLUS
1080 #undef VALUE_COMMA
1081 #undef STRING_NULL
1082 #undef EACH_NAMED_CON
1083 #endif // PRODUCT
1084
1085 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1086 #ifndef PRODUCT
1087 if (advertise_con_value(which)) {
1088 assert(which >= 0 && which < con_value_count, "");
1089 int con = con_values[which];
1090 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1091 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1092 const char* str = &con_names[0];
1093 for (int i = 0; i < which; i++)
1094 str += strlen(str) + 1; // skip name and null
1095 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1096 box->obj_at_put(0, name);
1097 }
1098 return con;
1099 }
1100 #endif
1101 return 0;
1102 }
1103 JVM_END
1104
1105 // void init(MemberName self, AccessibleObject ref)
1106 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1107 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1108 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1109 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1110 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1111 MethodHandles::init_MemberName(mname, target);
1112 }
1113 JVM_END
1114
1115 // void expand(MemberName self)
1116 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1117 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1118 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1119 MethodHandles::expand_MemberName(mname, 0, CHECK);
1120 }
1121 JVM_END
1122
1123 // void resolve(MemberName self, Class<?> caller)
1124 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1125 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1126 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1127
1128 // The trusted Java code that calls this method should already have performed
1129 // access checks on behalf of the given caller. But, we can verify this.
1130 if (VerifyMethodHandles && caller_jh != NULL &&
1131 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1132 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1133 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1134 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1135 }
1136
1137 // Reflection::verify_class_access can only handle instance classes.
1138 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1139 // Emulate LinkResolver::check_klass_accessability.
1140 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1141 if (!Reflection::verify_class_access(caller,
1142 reference_klass,
1143 true)) {
1144 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1145 }
1146 }
1147 }
1148
1149 KlassHandle caller(THREAD,
1150 caller_jh == NULL ? (Klass*) NULL :
1151 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1152 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1153
1154 if (resolved.is_null()) {
1155 int flags = java_lang_invoke_MemberName::flags(mname());
1156 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1157 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1158 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1159 }
1160 if ((flags & ALL_KINDS) == IS_FIELD) {
1161 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1162 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1163 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1164 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1165 } else {
1166 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1167 }
1168 }
1169
1170 return JNIHandles::make_local(THREAD, resolved());
1171 }
1172 JVM_END
1173
1174 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1175 if (mname == NULL ||
1176 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1177 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1178 } else {
1179 int flags = java_lang_invoke_MemberName::flags(mname);
1180 if ((flags & IS_FIELD) != 0 &&
1181 (must_be_static
1182 ? (flags & JVM_ACC_STATIC) != 0
1183 : (flags & JVM_ACC_STATIC) == 0)) {
1184 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1185 return (jlong) vmindex;
1186 }
1187 }
1188 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1189 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1190 return 0;
1191 }
1192
1193 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1194 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1195 }
1196 JVM_END
1197
1198 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1199 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1200 }
1201 JVM_END
1202
1203 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1204 // use the other function to perform sanity checks:
1205 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1206 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1207 return JNIHandles::make_local(THREAD, clazz);
1208 }
1209 JVM_END
1210
1211 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1212 if (mname_jh == NULL) return NULL;
1213 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1214 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1215 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1216 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1217 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1218 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1219 result->obj_at_put(0, x);
1220 x = NULL;
1221 if (vmtarget == NULL) {
1222 x = NULL;
1223 } else if (vmtarget->is_klass()) {
1224 x = ((Klass*) vmtarget)->java_mirror();
1225 } else if (vmtarget->is_method()) {
1226 x = mname();
1227 }
1228 result->obj_at_put(1, x);
1229 return JNIHandles::make_local(env, result());
1230 }
1231 JVM_END
1232
1233
1234
1235 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1236 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1237 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1238 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1239 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1240 if (clazz_jh == NULL || results_jh == NULL) return -1;
1241 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1242
1243 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1244 if (results.is_null() || !results->is_objArray()) return -1;
1245
1246 TempNewSymbol name = NULL;
1247 TempNewSymbol sig = NULL;
1248 if (name_jh != NULL) {
1249 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1250 if (name == NULL) return 0; // a match is not possible
1251 }
1252 if (sig_jh != NULL) {
1253 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1254 if (sig == NULL) return 0; // a match is not possible
1255 }
1256
1257 KlassHandle caller;
1258 if (caller_jh != NULL) {
1259 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1260 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1261 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1262 }
1263
1264 if (name != NULL && sig != NULL && results.not_null()) {
1265 // try a direct resolve
1266 // %%% TO DO
1267 }
1268
1269 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1270 caller, skip, results);
1271 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1272 return res;
1273 }
1274 JVM_END
1275
1276 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1277 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1278 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1279 {
1280 // Walk all nmethods depending on this call site.
1281 MutexLocker mu(Compile_lock, thread);
1282 CodeCache::flush_dependents_on(call_site, target);
1283 java_lang_invoke_CallSite::set_target(call_site(), target());
1284 }
1285 }
1286 JVM_END
1287
1288 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1289 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1290 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1291 {
1292 // Walk all nmethods depending on this call site.
1293 MutexLocker mu(Compile_lock, thread);
1294 CodeCache::flush_dependents_on(call_site, target);
1295 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1296 }
1297 }
1298 JVM_END
1299
1300 JVM_ENTRY(void, MHN_invalidateDependentNMethods(JNIEnv* env, jobject igcls, jobject call_site_jh)) {
1301 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1302 {
1303 // Walk all nmethods depending on this call site.
1304 MutexLocker mu1(Compile_lock, thread);
1305
1306 CallSiteDepChange changes(call_site(), Handle());
1307
1308 InstanceKlass* ctxk = MethodHandles::get_call_site_context(call_site());
1309 if (ctxk == NULL) {
1310 return; // No dependencies to invalidate yet.
1311 }
1312 int marked = 0;
1313 {
1314 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1315 marked = ctxk->mark_dependent_nmethods(changes);
1316 }
1317 java_lang_invoke_CallSite::set_context_volatile(call_site(), NULL); // Reset call site to initial state
1318 if (marked > 0) {
1319 // At least one nmethod has been marked for deoptimization
1320 VM_Deoptimize op;
1321 VMThread::execute(&op);
1322 }
1323 }
1324 }
1325 JVM_END
1326
1327 /**
1328 * Throws a java/lang/UnsupportedOperationException unconditionally.
1329 * This is required by the specification of MethodHandle.invoke if
1330 * invoked directly.
1331 */
1332 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1333 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1334 return NULL;
1335 }
1336 JVM_END
1337
1338 /**
1339 * Throws a java/lang/UnsupportedOperationException unconditionally.
1340 * This is required by the specification of MethodHandle.invokeExact if
1341 * invoked directly.
1342 */
1343 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1344 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1345 return NULL;
1346 }
1347 JVM_END
1348
1349 /// JVM_RegisterMethodHandleMethods
1350
1351 #undef CS // Solaris builds complain
1352
1353 #define LANG "Ljava/lang/"
1354 #define JLINV "Ljava/lang/invoke/"
1355
1356 #define OBJ LANG"Object;"
1357 #define CLS LANG"Class;"
1358 #define STRG LANG"String;"
1359 #define CS JLINV"CallSite;"
1360 #define MT JLINV"MethodType;"
1361 #define MH JLINV"MethodHandle;"
1362 #define MEM JLINV"MemberName;"
1363
1364 #define CC (char*) /*cast a literal from (const char*)*/
1365 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1366
1367 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1368 static JNINativeMethod MHN_methods[] = {
1369 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1370 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1371 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1372 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1373 // static native int getNamedCon(int which, Object[] name)
1374 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1375 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1376 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1377 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1378 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1379 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1380 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1381 {CC"invalidateDependentNMethods", CC"("CS")V", FN_PTR(MHN_invalidateDependentNMethods)},
1382 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1383 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1384 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1385 };
1386
1387 static JNINativeMethod MH_methods[] = {
1388 // UnsupportedOperationException throwers
1389 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1390 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1391 };
1392
1393 /**
1394 * Helper method to register native methods.
1395 */
1396 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1397 int status = env->RegisterNatives(clazz, methods, nMethods);
1398 if (status != JNI_OK || env->ExceptionOccurred()) {
1399 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1400 env->ExceptionClear();
1401 return false;
1402 }
1403 return true;
1404 }
1405
1406 /**
1407 * This one function is exported, used by NativeLookup.
1408 */
1409 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1410 assert(!MethodHandles::enabled(), "must not be enabled");
1411 bool enable_MH = true;
1412
1413 jclass MH_class = NULL;
1414 if (SystemDictionary::MethodHandle_klass() == NULL) {
1415 enable_MH = false;
1416 } else {
1417 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1418 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1419 }
1420
1421 if (enable_MH) {
1422 ThreadToNativeFromVM ttnfv(thread);
1423
1424 if (enable_MH) {
1425 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1426 }
1427 if (enable_MH) {
1428 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1429 }
1430 }
1431
1432 if (TraceInvokeDynamic) {
1433 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1434 }
1435
1436 if (enable_MH) {
1437 if (MethodHandles::generate_adapters() == false) {
1438 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters");
1439 }
1440 MethodHandles::set_enabled(true);
1441 }
1442 }
1443 JVM_END