1 /*
2 * Copyright (c) 2008, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/stringTable.hpp"
27 #include "compiler/compileBroker.hpp"
28 #include "interpreter/interpreter.hpp"
29 #include "interpreter/oopMapCache.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "prims/jvmtiRedefineClassesTrace.hpp"
33 #include "prims/methodHandles.hpp"
34 #include "runtime/compilationPolicy.hpp"
35 #include "runtime/javaCalls.hpp"
36 #include "runtime/reflection.hpp"
37 #include "runtime/signature.hpp"
38 #include "runtime/stubRoutines.hpp"
39
40
41 /*
42 * JSR 292 reference implementation: method handles
43 * The JDK 7 reference implementation represented method handle
44 * combinations as chains. Each link in the chain had a "vmentry"
45 * field which pointed at a bit of assembly code which performed
46 * one transformation before dispatching to the next link in the chain.
47 *
48 * The current reference implementation pushes almost all code generation
49 * responsibility to (trusted) Java code. A method handle contains a
50 * pointer to its "LambdaForm", which embodies all details of the method
51 * handle's behavior. The LambdaForm is a normal Java object, managed
52 * by a runtime coded in Java.
53 */
54
55 bool MethodHandles::_enabled = false; // set true after successful native linkage
56 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
57
58 //------------------------------------------------------------------------------
59 // MethodHandles::generate_adapters
60 //
61 void MethodHandles::generate_adapters() {
62 if (SystemDictionary::MethodHandle_klass() == NULL) return;
63
64 assert(_adapter_code == NULL, "generate only once");
65
66 ResourceMark rm;
67 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
68 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
69 if (_adapter_code == NULL)
70 vm_exit_out_of_memory(adapter_code_size, OOM_MALLOC_ERROR,
71 "CodeCache: no room for MethodHandles adapters");
72 {
73 CodeBuffer code(_adapter_code);
74 MethodHandlesAdapterGenerator g(&code);
75 g.generate();
76 code.log_section_sizes("MethodHandlesAdapterBlob");
77 }
78 }
79
80 //------------------------------------------------------------------------------
81 // MethodHandlesAdapterGenerator::generate
82 //
83 void MethodHandlesAdapterGenerator::generate() {
84 // Generate generic method handle adapters.
85 // Generate interpreter entries
86 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
87 mk <= Interpreter::method_handle_invoke_LAST;
88 mk = Interpreter::MethodKind(1 + (int)mk)) {
89 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
90 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
91 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
92 if (entry != NULL) {
93 Interpreter::set_entry_for_kind(mk, entry);
94 }
95 // If the entry is not set, it will throw AbstractMethodError.
96 }
97 }
98
99 void MethodHandles::set_enabled(bool z) {
100 if (_enabled != z) {
101 guarantee(z, "can only enable once");
102 _enabled = z;
103 }
104 }
105
106 // MemberName support
107
108 // import java_lang_invoke_MemberName.*
109 enum {
110 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
111 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
112 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
113 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
114 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
115 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
116 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
117 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
118 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
119 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
120 };
121
122 Handle MethodHandles::new_MemberName(TRAPS) {
123 Handle empty;
124 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
125 if (!k->is_initialized()) k->initialize(CHECK_(empty));
126 return Handle(THREAD, k->allocate_instance(THREAD));
127 }
128
129 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
130 // This method is used from java.lang.invoke.MemberName constructors.
131 // It fills in the new MemberName from a java.lang.reflect.Member.
132 Thread* thread = Thread::current();
133 oop target_oop = target();
134 Klass* target_klass = target_oop->klass();
135 if (target_klass == SystemDictionary::reflect_Field_klass()) {
136 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
137 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
138 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
139 if (!k.is_null() && k->oop_is_instance()) {
140 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
141 oop mname2 = init_field_MemberName(mname, fd);
142 if (mname2 != NULL) {
143 // Since we have the reified name and type handy, add them to the result.
144 if (java_lang_invoke_MemberName::name(mname2) == NULL)
145 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
146 if (java_lang_invoke_MemberName::type(mname2) == NULL)
147 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
148 }
149 return mname2;
150 }
151 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
152 oop clazz = java_lang_reflect_Method::clazz(target_oop);
153 int slot = java_lang_reflect_Method::slot(target_oop);
154 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
155 if (!k.is_null() && k->oop_is_instance()) {
156 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
157 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
158 return NULL; // do not resolve unless there is a concrete signature
159 CallInfo info(m, k());
160 return init_method_MemberName(mname, info);
161 }
162 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
163 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
164 int slot = java_lang_reflect_Constructor::slot(target_oop);
165 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
166 if (!k.is_null() && k->oop_is_instance()) {
167 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
168 if (m == NULL) return NULL;
169 CallInfo info(m, k());
170 return init_method_MemberName(mname, info);
171 }
172 }
173 return NULL;
174 }
175
176 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
177 assert(info.resolved_appendix().is_null(), "only normal methods here");
178 methodHandle m = info.resolved_method();
179 KlassHandle m_klass = m->method_holder();
180 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
181 int vmindex = Method::invalid_vtable_index;
182
183 switch (info.call_kind()) {
184 case CallInfo::itable_call:
185 vmindex = info.itable_index();
186 // More importantly, the itable index only works with the method holder.
187 assert(m_klass->verify_itable_index(vmindex), "");
188 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
189 if (TraceInvokeDynamic) {
190 ResourceMark rm;
191 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
192 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
193 vmindex);
194 m->access_flags().print_on(tty);
195 if (!m->is_abstract()) {
196 tty->print("default");
197 }
198 tty->cr();
199 }
200 break;
201
202 case CallInfo::vtable_call:
203 vmindex = info.vtable_index();
204 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
205 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
206 if (m_klass->is_interface()) {
207 // This is a vtable call to an interface method (abstract "miranda method" or default method).
208 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
209 // (LinkResolver should help us figure this out.)
210 KlassHandle m_klass_non_interface = info.resolved_klass();
211 if (m_klass_non_interface->is_interface()) {
212 m_klass_non_interface = SystemDictionary::Object_klass();
213 #ifdef ASSERT
214 { ResourceMark rm;
215 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
216 assert(m->name() == m2->name() && m->signature() == m2->signature(),
217 err_msg("at %d, %s != %s", vmindex,
218 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
219 }
220 #endif //ASSERT
221 }
222 if (!m->is_public()) {
223 assert(m->is_public(), "virtual call must be to public interface method");
224 return NULL; // elicit an error later in product build
225 }
226 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
227 m_klass = m_klass_non_interface;
228 }
229 if (TraceInvokeDynamic) {
230 ResourceMark rm;
231 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
232 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
233 m_klass->internal_name(), vmindex);
234 m->access_flags().print_on(tty);
235 if (m->is_default_method()) {
236 tty->print("default");
237 }
238 tty->cr();
239 }
240 break;
241
242 case CallInfo::direct_call:
243 vmindex = Method::nonvirtual_vtable_index;
244 if (m->is_static()) {
245 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
246 } else if (m->is_initializer()) {
247 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
248 } else {
249 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
250 }
251 break;
252
253 default: assert(false, "bad CallInfo"); return NULL;
254 }
255
256 // @CallerSensitive annotation detected
257 if (m->caller_sensitive()) {
258 flags |= CALLER_SENSITIVE;
259 }
260
261 oop mname_oop = mname();
262 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
263 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
264 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
265 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
266 // Note: name and type can be lazily computed by resolve_MemberName,
267 // if Java code needs them as resolved String and MethodType objects.
268 // The clazz must be eagerly stored, because it provides a GC
269 // root to help keep alive the Method*.
270 // If relevant, the vtable or itable value is stored as vmindex.
271 // This is done eagerly, since it is readily available without
272 // constructing any new objects.
273 // TO DO: maybe intern mname_oop
274 m->method_holder()->add_member_name(m->method_idnum(), mname);
275
276 return mname();
277 }
278
279 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
280 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
281 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
282 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
283 Metadata* vmtarget = fd.field_holder();
284 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
285 oop mname_oop = mname();
286 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
287 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
288 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
289 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
290 oop type = field_signature_type_or_null(fd.signature());
291 oop name = field_name_or_null(fd.name());
292 if (name != NULL)
293 java_lang_invoke_MemberName::set_name(mname_oop, name);
294 if (type != NULL)
295 java_lang_invoke_MemberName::set_type(mname_oop, type);
296 // Note: name and type can be lazily computed by resolve_MemberName,
297 // if Java code needs them as resolved String and Class objects.
298 // Note that the incoming type oop might be pre-resolved (non-null).
299 // The base clazz and field offset (vmindex) must be eagerly stored,
300 // because they unambiguously identify the field.
301 // Although the fieldDescriptor::_index would also identify the field,
302 // we do not use it, because it is harder to decode.
303 // TO DO: maybe intern mname_oop
304 return mname();
305 }
306
307 // JVM 2.9 Special Methods:
308 // A method is signature polymorphic if and only if all of the following conditions hold :
309 // * It is declared in the java.lang.invoke.MethodHandle class.
310 // * It has a single formal parameter of type Object[].
311 // * It has a return type of Object.
312 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
313 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
314 if (klass == NULL)
315 return false;
316 // The following test will fail spuriously during bootstrap of MethodHandle itself:
317 // if (klass != SystemDictionary::MethodHandle_klass())
318 // Test the name instead:
319 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
320 return false;
321 Symbol* poly_sig = vmSymbols::object_array_object_signature();
322 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
323 if (m == NULL) return false;
324 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
325 int flags = m->access_flags().as_int();
326 return (flags & required) == required;
327 }
328
329
330 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
331 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
332 switch (iid) {
333 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
334 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
335 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
336 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
337 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
338 }
339 assert(false, "");
340 return 0;
341 }
342
343 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
344 switch (iid) {
345 case vmIntrinsics::_invokeBasic: return 0;
346 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
347 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
348 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
349 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
350 }
351 assert(false, err_msg("iid=%d", iid));
352 return 0;
353 }
354
355 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
356 vmSymbols::SID name_id = vmSymbols::find_sid(name);
357 switch (name_id) {
358 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
359 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
360 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
361 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
362
363 // There is one static signature-polymorphic method for each JVM invocation mode.
364 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
365 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
366 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
367 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
368 }
369
370 // Cover the case of invokeExact and any future variants of invokeFoo.
371 Klass* mh_klass = SystemDictionary::well_known_klass(
372 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
373 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
374 return vmIntrinsics::_invokeGeneric;
375
376 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
377 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
378 return vmIntrinsics::_none;
379 }
380
381 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
382 if (klass != NULL &&
383 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
384 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
385 if (iid != vmIntrinsics::_none)
386 return iid;
387 if (is_method_handle_invoke_name(klass, name))
388 return vmIntrinsics::_invokeGeneric;
389 }
390 return vmIntrinsics::_none;
391 }
392
393
394 // convert the external string or reflective type to an internal signature
395 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
396 if (java_lang_invoke_MethodType::is_instance(type_str)) {
397 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
398 } else if (java_lang_Class::is_instance(type_str)) {
399 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
400 } else if (java_lang_String::is_instance(type_str)) {
401 if (intern_if_not_found) {
402 return java_lang_String::as_symbol(type_str, CHECK_NULL);
403 } else {
404 return java_lang_String::as_symbol_or_null(type_str);
405 }
406 } else {
407 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
408 }
409 }
410
411 static const char OBJ_SIG[] = "Ljava/lang/Object;";
412 enum { OBJ_SIG_LEN = 18 };
413
414 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
415 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
416 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
417 const int len = sig->utf8_length();
418 for (int i = 0; i < len; i++) {
419 switch (sig->byte_at(i)) {
420 case 'L':
421 // only java/lang/Object is valid here
422 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
423 return false;
424 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
425 continue;
426 case '(': case ')': case 'V':
427 case 'I': case 'J': case 'F': case 'D':
428 continue;
429 //case '[':
430 //case 'Z': case 'B': case 'C': case 'S':
431 default:
432 return false;
433 }
434 }
435 return true;
436 }
437
438 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
439 Symbol* bsig = NULL;
440 if (sig == NULL) {
441 return sig;
442 } else if (is_basic_type_signature(sig)) {
443 sig->increment_refcount();
444 return sig; // that was easy
445 } else if (sig->byte_at(0) != '(') {
446 BasicType bt = char2type(sig->byte_at(0));
447 if (is_subword_type(bt)) {
448 bsig = vmSymbols::int_signature();
449 } else {
450 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
451 bsig = vmSymbols::object_signature();
452 }
453 } else {
454 ResourceMark rm;
455 stringStream buffer(128);
456 buffer.put('(');
457 int arg_pos = 0, keep_arg_pos = -1;
458 if (keep_last_arg)
459 keep_arg_pos = ArgumentCount(sig).size() - 1;
460 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
461 BasicType bt = ss.type();
462 size_t this_arg_pos = buffer.size();
463 if (ss.at_return_type()) {
464 buffer.put(')');
465 }
466 if (arg_pos == keep_arg_pos) {
467 buffer.write((char*) ss.raw_bytes(),
468 (int) ss.raw_length());
469 } else if (bt == T_OBJECT || bt == T_ARRAY) {
470 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
471 } else {
472 if (is_subword_type(bt))
473 bt = T_INT;
474 buffer.put(type2char(bt));
475 }
476 arg_pos++;
477 }
478 const char* sigstr = buffer.base();
479 int siglen = (int) buffer.size();
480 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
481 }
482 assert(is_basic_type_signature(bsig) ||
483 // detune assert in case the injected argument is not a basic type:
484 keep_last_arg, "");
485 return bsig;
486 }
487
488 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
489 Symbol* sig,
490 bool keep_arrays,
491 bool keep_basic_names) {
492 st = st ? st : tty;
493 int len = sig->utf8_length();
494 int array = 0;
495 bool prev_type = false;
496 for (int i = 0; i < len; i++) {
497 char ch = sig->byte_at(i);
498 switch (ch) {
499 case '(': case ')':
500 prev_type = false;
501 st->put(ch);
502 continue;
503 case '[':
504 if (!keep_basic_names && keep_arrays)
505 st->put(ch);
506 array++;
507 continue;
508 case 'L':
509 {
510 if (prev_type) st->put(',');
511 int start = i+1, slash = start;
512 while (++i < len && (ch = sig->byte_at(i)) != ';') {
513 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
514 }
515 if (slash < i) start = slash;
516 if (!keep_basic_names) {
517 st->put('L');
518 } else {
519 for (int j = start; j < i; j++)
520 st->put(sig->byte_at(j));
521 prev_type = true;
522 }
523 break;
524 }
525 default:
526 {
527 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
528 ch = '[';
529 array = 0;
530 }
531 if (prev_type) st->put(',');
532 const char* n = NULL;
533 if (keep_basic_names)
534 n = type2name(char2type(ch));
535 if (n == NULL) {
536 // unknown letter, or we don't want to know its name
537 st->put(ch);
538 } else {
539 st->print("%s", n);
540 prev_type = true;
541 }
542 break;
543 }
544 }
545 // Switch break goes here to take care of array suffix:
546 if (prev_type) {
547 while (array > 0) {
548 st->print("[]");
549 --array;
550 }
551 }
552 array = 0;
553 }
554 }
555
556
557
558 static oop object_java_mirror() {
559 return SystemDictionary::Object_klass()->java_mirror();
560 }
561
562 oop MethodHandles::field_name_or_null(Symbol* s) {
563 if (s == NULL) return NULL;
564 return StringTable::lookup(s);
565 }
566
567 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
568 if (s == NULL) return NULL;
569 BasicType bt = FieldType::basic_type(s);
570 if (is_java_primitive(bt)) {
571 assert(s->utf8_length() == 1, "");
572 return java_lang_Class::primitive_mirror(bt);
573 }
574 // Here are some more short cuts for common types.
575 // They are optional, since reference types can be resolved lazily.
576 if (bt == T_OBJECT) {
577 if (s == vmSymbols::object_signature()) {
578 return object_java_mirror();
579 } else if (s == vmSymbols::class_signature()) {
580 return SystemDictionary::Class_klass()->java_mirror();
581 } else if (s == vmSymbols::string_signature()) {
582 return SystemDictionary::String_klass()->java_mirror();
583 }
584 }
585 return NULL;
586 }
587
588
589 // An unresolved member name is a mere symbolic reference.
590 // Resolving it plants a vmtarget/vmindex in it,
591 // which refers directly to JVM internals.
592 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
593 Handle empty;
594 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
595
596 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
597 // Already resolved.
598 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
599 assert(vmindex >= Method::nonvirtual_vtable_index, "");
600 return mname;
601 }
602
603 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
604 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
605 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
606 int flags = java_lang_invoke_MemberName::flags(mname());
607 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
608 if (!ref_kind_is_valid(ref_kind)) {
609 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
610 }
611
612 DEBUG_ONLY(int old_vmindex);
613 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
614
615 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
616 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
617 }
618
619 instanceKlassHandle defc;
620 {
621 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
622 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
623 if (!defc_klass->oop_is_instance()) {
624 if (!defc_klass->oop_is_array()) return empty;
625 defc_klass = SystemDictionary::Object_klass();
626 }
627 defc = instanceKlassHandle(THREAD, defc_klass);
628 }
629 if (defc.is_null()) {
630 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
631 }
632 defc->link_class(CHECK_(empty)); // possible safepoint
633
634 // convert the external string name to an internal symbol
635 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
636 if (name == NULL) return empty; // no such name
637 if (name == vmSymbols::class_initializer_name())
638 return empty; // illegal name
639
640 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
641 if ((flags & ALL_KINDS) == IS_METHOD &&
642 (defc() == SystemDictionary::MethodHandle_klass()) &&
643 (ref_kind == JVM_REF_invokeVirtual ||
644 ref_kind == JVM_REF_invokeSpecial ||
645 // static invocation mode is required for _linkToVirtual, etc.:
646 ref_kind == JVM_REF_invokeStatic)) {
647 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
648 if (iid != vmIntrinsics::_none &&
649 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
650 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
651 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
652 mh_invoke_id = iid;
653 }
654 }
655
656 // convert the external string or reflective type to an internal signature
657 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
658 if (type == NULL) return empty; // no such signature exists in the VM
659
660 // Time to do the lookup.
661 switch (flags & ALL_KINDS) {
662 case IS_METHOD:
663 {
664 CallInfo result;
665 {
666 assert(!HAS_PENDING_EXCEPTION, "");
667 if (ref_kind == JVM_REF_invokeStatic) {
668 LinkResolver::resolve_static_call(result,
669 defc, name, type, caller, caller.not_null(), false, THREAD);
670 } else if (ref_kind == JVM_REF_invokeInterface) {
671 LinkResolver::resolve_interface_call(result, Handle(), defc,
672 defc, name, type, caller, caller.not_null(), false, THREAD);
673 } else if (mh_invoke_id != vmIntrinsics::_none) {
674 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
675 LinkResolver::resolve_handle_call(result,
676 defc, name, type, caller, THREAD);
677 } else if (ref_kind == JVM_REF_invokeSpecial) {
678 LinkResolver::resolve_special_call(result,
679 defc, name, type, caller, caller.not_null(), THREAD);
680 } else if (ref_kind == JVM_REF_invokeVirtual) {
681 LinkResolver::resolve_virtual_call(result, Handle(), defc,
682 defc, name, type, caller, caller.not_null(), false, THREAD);
683 } else {
684 assert(false, err_msg("ref_kind=%d", ref_kind));
685 }
686 if (HAS_PENDING_EXCEPTION) {
687 return empty;
688 }
689 }
690 if (result.resolved_appendix().not_null()) {
691 // The resolved MemberName must not be accompanied by an appendix argument,
692 // since there is no way to bind this value into the MemberName.
693 // Caller is responsible to prevent this from happening.
694 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
695 }
696 oop mname2 = init_method_MemberName(mname, result);
697 return Handle(THREAD, mname2);
698 }
699 case IS_CONSTRUCTOR:
700 {
701 CallInfo result;
702 {
703 assert(!HAS_PENDING_EXCEPTION, "");
704 if (name == vmSymbols::object_initializer_name()) {
705 LinkResolver::resolve_special_call(result,
706 defc, name, type, caller, caller.not_null(), THREAD);
707 } else {
708 break; // will throw after end of switch
709 }
710 if (HAS_PENDING_EXCEPTION) {
711 return empty;
712 }
713 }
714 assert(result.is_statically_bound(), "");
715 oop mname2 = init_method_MemberName(mname, result);
716 return Handle(THREAD, mname2);
717 }
718 case IS_FIELD:
719 {
720 fieldDescriptor result; // find_field initializes fd if found
721 {
722 assert(!HAS_PENDING_EXCEPTION, "");
723 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD);
724 if (HAS_PENDING_EXCEPTION) {
725 return empty;
726 }
727 }
728 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
729 return Handle(THREAD, mname2);
730 }
731 default:
732 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
733 }
734
735 return empty;
736 }
737
738 // Conversely, a member name which is only initialized from JVM internals
739 // may have null defc, name, and type fields.
740 // Resolving it plants a vmtarget/vmindex in it,
741 // which refers directly to JVM internals.
742 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
743 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
744 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
745 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
746 if (vmtarget == NULL) {
747 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
748 }
749
750 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
751 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
752 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
753 int flags = java_lang_invoke_MemberName::flags(mname());
754
755 if (suppress != 0) {
756 if (suppress & _suppress_defc) have_defc = true;
757 if (suppress & _suppress_name) have_name = true;
758 if (suppress & _suppress_type) have_type = true;
759 }
760
761 if (have_defc && have_name && have_type) return; // nothing needed
762
763 switch (flags & ALL_KINDS) {
764 case IS_METHOD:
765 case IS_CONSTRUCTOR:
766 {
767 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
768 methodHandle m(THREAD, (Method*)vmtarget);
769 DEBUG_ONLY(vmtarget = NULL); // safety
770 if (m.is_null()) break;
771 if (!have_defc) {
772 InstanceKlass* defc = m->method_holder();
773 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
774 }
775 if (!have_name) {
776 //not java_lang_String::create_from_symbol; let's intern member names
777 Handle name = StringTable::intern(m->name(), CHECK);
778 java_lang_invoke_MemberName::set_name(mname(), name());
779 }
780 if (!have_type) {
781 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
782 java_lang_invoke_MemberName::set_type(mname(), type());
783 }
784 return;
785 }
786 case IS_FIELD:
787 {
788 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
789 if (!((Klass*) vmtarget)->oop_is_instance()) break;
790 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
791 DEBUG_ONLY(vmtarget = NULL); // safety
792 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
793 fieldDescriptor fd; // find_field initializes fd if found
794 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
795 break; // cannot expand
796 if (!have_defc) {
797 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
798 }
799 if (!have_name) {
800 //not java_lang_String::create_from_symbol; let's intern member names
801 Handle name = StringTable::intern(fd.name(), CHECK);
802 java_lang_invoke_MemberName::set_name(mname(), name());
803 }
804 if (!have_type) {
805 // If it is a primitive field type, don't mess with short strings like "I".
806 Handle type = field_signature_type_or_null(fd.signature());
807 if (type.is_null()) {
808 java_lang_String::create_from_symbol(fd.signature(), CHECK);
809 }
810 java_lang_invoke_MemberName::set_type(mname(), type());
811 }
812 return;
813 }
814 }
815 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
816 }
817
818 int MethodHandles::find_MemberNames(KlassHandle k,
819 Symbol* name, Symbol* sig,
820 int mflags, KlassHandle caller,
821 int skip, objArrayHandle results) {
822 // %%% take caller into account!
823
824 Thread* thread = Thread::current();
825
826 if (k.is_null() || !k->oop_is_instance()) return -1;
827
828 int rfill = 0, rlimit = results->length(), rskip = skip;
829 // overflow measurement:
830 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
831
832 int match_flags = mflags;
833 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
834 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
835 bool local_only = !(search_superc | search_intfc);
836 bool classes_only = false;
837
838 if (name != NULL) {
839 if (name->utf8_length() == 0) return 0; // a match is not possible
840 }
841 if (sig != NULL) {
842 if (sig->utf8_length() == 0) return 0; // a match is not possible
843 if (sig->byte_at(0) == '(')
844 match_flags &= ~(IS_FIELD | IS_TYPE);
845 else
846 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
847 }
848
849 if ((match_flags & IS_TYPE) != 0) {
850 // NYI, and Core Reflection works quite well for this query
851 }
852
853 if ((match_flags & IS_FIELD) != 0) {
854 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
855 if (name != NULL && st.name() != name)
856 continue;
857 if (sig != NULL && st.signature() != sig)
858 continue;
859 // passed the filters
860 if (rskip > 0) {
861 --rskip;
862 } else if (rfill < rlimit) {
863 Handle result(thread, results->obj_at(rfill++));
864 if (!java_lang_invoke_MemberName::is_instance(result()))
865 return -99; // caller bug!
866 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
867 if (saved != result())
868 results->obj_at_put(rfill-1, saved); // show saved instance to user
869 } else if (++overflow >= overflow_limit) {
870 match_flags = 0; break; // got tired of looking at overflow
871 }
872 }
873 }
874
875 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
876 // watch out for these guys:
877 Symbol* init_name = vmSymbols::object_initializer_name();
878 Symbol* clinit_name = vmSymbols::class_initializer_name();
879 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
880 bool negate_name_test = false;
881 // fix name so that it captures the intention of IS_CONSTRUCTOR
882 if (!(match_flags & IS_METHOD)) {
883 // constructors only
884 if (name == NULL) {
885 name = init_name;
886 } else if (name != init_name) {
887 return 0; // no constructors of this method name
888 }
889 } else if (!(match_flags & IS_CONSTRUCTOR)) {
890 // methods only
891 if (name == NULL) {
892 name = init_name;
893 negate_name_test = true; // if we see the name, we *omit* the entry
894 } else if (name == init_name) {
895 return 0; // no methods of this constructor name
896 }
897 } else {
898 // caller will accept either sort; no need to adjust name
899 }
900 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
901 Method* m = st.method();
902 Symbol* m_name = m->name();
903 if (m_name == clinit_name)
904 continue;
905 if (name != NULL && ((m_name != name) ^ negate_name_test))
906 continue;
907 if (sig != NULL && m->signature() != sig)
908 continue;
909 // passed the filters
910 if (rskip > 0) {
911 --rskip;
912 } else if (rfill < rlimit) {
913 Handle result(thread, results->obj_at(rfill++));
914 if (!java_lang_invoke_MemberName::is_instance(result()))
915 return -99; // caller bug!
916 CallInfo info(m);
917 oop saved = MethodHandles::init_method_MemberName(result, info);
918 if (saved != result())
919 results->obj_at_put(rfill-1, saved); // show saved instance to user
920 } else if (++overflow >= overflow_limit) {
921 match_flags = 0; break; // got tired of looking at overflow
922 }
923 }
924 }
925
926 // return number of elements we at leasted wanted to initialize
927 return rfill + overflow;
928 }
929
930 //------------------------------------------------------------------------------
931 // MemberNameTable
932 //
933
934 MemberNameTable::MemberNameTable(int methods_cnt)
935 : GrowableArray<jweak>(methods_cnt, true) {
936 assert_locked_or_safepoint(MemberNameTable_lock);
937 }
938
939 MemberNameTable::~MemberNameTable() {
940 assert_locked_or_safepoint(MemberNameTable_lock);
941 int len = this->length();
942
943 for (int idx = 0; idx < len; idx++) {
944 jweak ref = this->at(idx);
945 JNIHandles::destroy_weak_global(ref);
946 }
947 }
948
949 void MemberNameTable::add_member_name(int index, jweak mem_name_wref) {
950 assert_locked_or_safepoint(MemberNameTable_lock);
951 this->at_put_grow(index, mem_name_wref);
952 }
953
954 // Return a member name oop or NULL.
955 oop MemberNameTable::get_member_name(int index) {
956 assert_locked_or_safepoint(MemberNameTable_lock);
957
958 jweak ref = this->at(index);
959 oop mem_name = JNIHandles::resolve(ref);
960 return mem_name;
961 }
962
963 #if INCLUDE_JVMTI
964 oop MemberNameTable::find_member_name_by_method(Method* old_method) {
965 assert_locked_or_safepoint(MemberNameTable_lock);
966 oop found = NULL;
967 int len = this->length();
968
969 for (int idx = 0; idx < len; idx++) {
970 oop mem_name = JNIHandles::resolve(this->at(idx));
971 if (mem_name == NULL) {
972 continue;
973 }
974 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
975 if (method == old_method) {
976 found = mem_name;
977 break;
978 }
979 }
980 return found;
981 }
982
983 // It is called at safepoint only
984 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
985 int methods_length, bool *trace_name_printed) {
986 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
987 // search the MemberNameTable for uses of either obsolete or EMCP methods
988 for (int j = 0; j < methods_length; j++) {
989 Method* old_method = old_methods[j];
990 Method* new_method = new_methods[j];
991 oop mem_name = find_member_name_by_method(old_method);
992 if (mem_name != NULL) {
993 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method);
994
995 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
996 if (!(*trace_name_printed)) {
997 // RC_TRACE_MESG macro has an embedded ResourceMark
998 RC_TRACE_MESG(("adjust: name=%s",
999 old_method->method_holder()->external_name()));
1000 *trace_name_printed = true;
1001 }
1002 // RC_TRACE macro has an embedded ResourceMark
1003 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
1004 new_method->name()->as_C_string(),
1005 new_method->signature()->as_C_string()));
1006 }
1007 }
1008 }
1009 }
1010 #endif // INCLUDE_JVMTI
1011
1012 //
1013 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1014 // They are the private interface between this JVM and the HotSpot-specific
1015 // Java code that implements JSR 292 method handles.
1016 //
1017 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1018 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1019 //
1020
1021 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
1022 switch (which) {
1023 case MethodHandles::GC_COUNT_GWT:
1024 #ifdef COMPILER2
1025 return true;
1026 #else
1027 return false;
1028 #endif
1029 }
1030 return 0;
1031 }
1032 JVM_END
1033
1034 #ifndef PRODUCT
1035 #define EACH_NAMED_CON(template, requirement) \
1036 template(MethodHandles,GC_COUNT_GWT) \
1037 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1038 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1039 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1040 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1041 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1042 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1043 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1044 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1045 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1046 template(MethodHandles,GC_LAMBDA_SUPPORT) \
1047 /*end*/
1048
1049 #define IGNORE_REQ(req_expr) /* req_expr */
1050 #define ONE_PLUS(scope,value) 1+
1051 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1052 #define VALUE_COMMA(scope,value) scope::value,
1053 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1054 #define STRING_NULL(scope,value) #value "\0"
1055 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1056
1057 static bool advertise_con_value(int which) {
1058 if (which < 0) return false;
1059 bool ok = true;
1060 int count = 0;
1061 #define INC_COUNT(scope,value) \
1062 ++count;
1063 #define CHECK_REQ(req_expr) \
1064 if (which < count) return ok; \
1065 ok = (req_expr);
1066 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1067 #undef INC_COUNT
1068 #undef CHECK_REQ
1069 assert(count == con_value_count, "");
1070 if (which < count) return ok;
1071 return false;
1072 }
1073
1074 #undef ONE_PLUS
1075 #undef VALUE_COMMA
1076 #undef STRING_NULL
1077 #undef EACH_NAMED_CON
1078 #endif // PRODUCT
1079
1080 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1081 #ifndef PRODUCT
1082 if (advertise_con_value(which)) {
1083 assert(which >= 0 && which < con_value_count, "");
1084 int con = con_values[which];
1085 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1086 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1087 const char* str = &con_names[0];
1088 for (int i = 0; i < which; i++)
1089 str += strlen(str) + 1; // skip name and null
1090 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1091 box->obj_at_put(0, name);
1092 }
1093 return con;
1094 }
1095 #endif
1096 return 0;
1097 }
1098 JVM_END
1099
1100 // void init(MemberName self, AccessibleObject ref)
1101 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1102 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1103 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1104 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1105 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1106 MethodHandles::init_MemberName(mname, target);
1107 }
1108 JVM_END
1109
1110 // void expand(MemberName self)
1111 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1112 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1113 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1114 MethodHandles::expand_MemberName(mname, 0, CHECK);
1115 }
1116 JVM_END
1117
1118 // void resolve(MemberName self, Class<?> caller)
1119 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1120 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1121 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1122
1123 // The trusted Java code that calls this method should already have performed
1124 // access checks on behalf of the given caller. But, we can verify this.
1125 if (VerifyMethodHandles && caller_jh != NULL &&
1126 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1127 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1128 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1129 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1130 }
1131
1132 // Reflection::verify_class_access can only handle instance classes.
1133 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1134 // Emulate LinkResolver::check_klass_accessability.
1135 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1136 if (!Reflection::verify_class_access(caller,
1137 reference_klass,
1138 true)) {
1139 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1140 }
1141 }
1142 }
1143
1144 KlassHandle caller(THREAD,
1145 caller_jh == NULL ? (Klass*) NULL :
1146 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1147 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1148
1149 if (resolved.is_null()) {
1150 int flags = java_lang_invoke_MemberName::flags(mname());
1151 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1152 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1153 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1154 }
1155 if ((flags & ALL_KINDS) == IS_FIELD) {
1156 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1157 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1158 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1159 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1160 } else {
1161 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1162 }
1163 }
1164
1165 return JNIHandles::make_local(THREAD, resolved());
1166 }
1167 JVM_END
1168
1169 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1170 if (mname == NULL ||
1171 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1172 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1173 } else {
1174 int flags = java_lang_invoke_MemberName::flags(mname);
1175 if ((flags & IS_FIELD) != 0 &&
1176 (must_be_static
1177 ? (flags & JVM_ACC_STATIC) != 0
1178 : (flags & JVM_ACC_STATIC) == 0)) {
1179 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1180 return (jlong) vmindex;
1181 }
1182 }
1183 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1184 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1185 return 0;
1186 }
1187
1188 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1189 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1190 }
1191 JVM_END
1192
1193 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1194 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1195 }
1196 JVM_END
1197
1198 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1199 // use the other function to perform sanity checks:
1200 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1201 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1202 return JNIHandles::make_local(THREAD, clazz);
1203 }
1204 JVM_END
1205
1206 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1207 if (mname_jh == NULL) return NULL;
1208 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1209 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1210 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1211 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1212 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1213 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1214 result->obj_at_put(0, x);
1215 x = NULL;
1216 if (vmtarget == NULL) {
1217 x = NULL;
1218 } else if (vmtarget->is_klass()) {
1219 x = ((Klass*) vmtarget)->java_mirror();
1220 } else if (vmtarget->is_method()) {
1221 x = mname();
1222 }
1223 result->obj_at_put(1, x);
1224 return JNIHandles::make_local(env, result());
1225 }
1226 JVM_END
1227
1228
1229
1230 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1231 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1232 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1233 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1234 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1235 if (clazz_jh == NULL || results_jh == NULL) return -1;
1236 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1237
1238 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1239 if (results.is_null() || !results->is_objArray()) return -1;
1240
1241 TempNewSymbol name = NULL;
1242 TempNewSymbol sig = NULL;
1243 if (name_jh != NULL) {
1244 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1245 if (name == NULL) return 0; // a match is not possible
1246 }
1247 if (sig_jh != NULL) {
1248 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1249 if (sig == NULL) return 0; // a match is not possible
1250 }
1251
1252 KlassHandle caller;
1253 if (caller_jh != NULL) {
1254 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1255 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1256 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1257 }
1258
1259 if (name != NULL && sig != NULL && results.not_null()) {
1260 // try a direct resolve
1261 // %%% TO DO
1262 }
1263
1264 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1265 caller, skip, results);
1266 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1267 return res;
1268 }
1269 JVM_END
1270
1271 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1272 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1273 Handle target (THREAD, JNIHandles::resolve(target_jh));
1274 {
1275 // Walk all nmethods depending on this call site.
1276 MutexLocker mu(Compile_lock, thread);
1277 Universe::flush_dependents_on(call_site, target);
1278 java_lang_invoke_CallSite::set_target(call_site(), target());
1279 }
1280 }
1281 JVM_END
1282
1283 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1284 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1285 Handle target (THREAD, JNIHandles::resolve(target_jh));
1286 {
1287 // Walk all nmethods depending on this call site.
1288 MutexLocker mu(Compile_lock, thread);
1289 Universe::flush_dependents_on(call_site, target);
1290 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1291 }
1292 }
1293 JVM_END
1294
1295 /**
1296 * Throws a java/lang/UnsupportedOperationException unconditionally.
1297 * This is required by the specification of MethodHandle.invoke if
1298 * invoked directly.
1299 */
1300 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1301 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1302 return NULL;
1303 }
1304 JVM_END
1305
1306 /**
1307 * Throws a java/lang/UnsupportedOperationException unconditionally.
1308 * This is required by the specification of MethodHandle.invokeExact if
1309 * invoked directly.
1310 */
1311 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1312 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1313 return NULL;
1314 }
1315 JVM_END
1316
1317 /// JVM_RegisterMethodHandleMethods
1318
1319 #undef CS // Solaris builds complain
1320
1321 #define LANG "Ljava/lang/"
1322 #define JLINV "Ljava/lang/invoke/"
1323
1324 #define OBJ LANG"Object;"
1325 #define CLS LANG"Class;"
1326 #define STRG LANG"String;"
1327 #define CS JLINV"CallSite;"
1328 #define MT JLINV"MethodType;"
1329 #define MH JLINV"MethodHandle;"
1330 #define MEM JLINV"MemberName;"
1331
1332 #define CC (char*) /*cast a literal from (const char*)*/
1333 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1334
1335 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1336 static JNINativeMethod MHN_methods[] = {
1337 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1338 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1339 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1340 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1341 // static native int getNamedCon(int which, Object[] name)
1342 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1343 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1344 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1345 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1346 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1347 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1348 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1349 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1350 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1351 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1352 };
1353
1354 static JNINativeMethod MH_methods[] = {
1355 // UnsupportedOperationException throwers
1356 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1357 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1358 };
1359
1360 /**
1361 * Helper method to register native methods.
1362 */
1363 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1364 int status = env->RegisterNatives(clazz, methods, nMethods);
1365 if (status != JNI_OK || env->ExceptionOccurred()) {
1366 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1367 env->ExceptionClear();
1368 return false;
1369 }
1370 return true;
1371 }
1372
1373 /**
1374 * This one function is exported, used by NativeLookup.
1375 */
1376 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1377 assert(!MethodHandles::enabled(), "must not be enabled");
1378 bool enable_MH = true;
1379
1380 jclass MH_class = NULL;
1381 if (SystemDictionary::MethodHandle_klass() == NULL) {
1382 enable_MH = false;
1383 } else {
1384 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1385 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1386 }
1387
1388 if (enable_MH) {
1389 ThreadToNativeFromVM ttnfv(thread);
1390
1391 if (enable_MH) {
1392 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1393 }
1394 if (enable_MH) {
1395 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1396 }
1397 }
1398
1399 if (TraceInvokeDynamic) {
1400 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1401 }
1402
1403 if (enable_MH) {
1404 MethodHandles::generate_adapters();
1405 MethodHandles::set_enabled(true);
1406 }
1407 }
1408 JVM_END