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 "prims/jvmtiRedefineClassesTrace.hpp"
39 #include "runtime/compilationPolicy.hpp"
40 #include "runtime/javaCalls.hpp"
41 #include "runtime/reflection.hpp"
42 #include "runtime/signature.hpp"
43 #include "runtime/stubRoutines.hpp"
44 #include "utilities/exceptions.hpp"
45
46
47 /*
48 * JSR 292 reference implementation: method handles
49 * The JDK 7 reference implementation represented method handle
50 * combinations as chains. Each link in the chain had a "vmentry"
51 * field which pointed at a bit of assembly code which performed
52 * one transformation before dispatching to the next link in the chain.
53 *
54 * The current reference implementation pushes almost all code generation
55 * responsibility to (trusted) Java code. A method handle contains a
56 * pointer to its "LambdaForm", which embodies all details of the method
57 * handle's behavior. The LambdaForm is a normal Java object, managed
58 * by a runtime coded in Java.
59 */
60
61 bool MethodHandles::_enabled = false; // set true after successful native linkage
62 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
63
64
65 /**
66 * Generates method handle adapters. Returns 'false' if memory allocation
67 * failed and true otherwise.
68 */
69 bool MethodHandles::generate_adapters() {
70 if (SystemDictionary::MethodHandle_klass() == NULL) {
71 return true;
72 }
73
74 assert(_adapter_code == NULL, "generate only once");
75
76 ResourceMark rm;
77 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
78 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
79 if (_adapter_code == NULL) {
80 return false;
81 }
82
83 CodeBuffer code(_adapter_code);
84 MethodHandlesAdapterGenerator g(&code);
85 g.generate();
86 code.log_section_sizes("MethodHandlesAdapterBlob");
87 return true;
88 }
89
90 //------------------------------------------------------------------------------
91 // MethodHandlesAdapterGenerator::generate
92 //
93 void MethodHandlesAdapterGenerator::generate() {
94 // Generate generic method handle adapters.
95 // Generate interpreter entries
96 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
97 mk <= Interpreter::method_handle_invoke_LAST;
98 mk = Interpreter::MethodKind(1 + (int)mk)) {
99 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
100 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
101 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
102 if (entry != NULL) {
103 Interpreter::set_entry_for_kind(mk, entry);
104 }
105 // If the entry is not set, it will throw AbstractMethodError.
106 }
107 }
108
109 void MethodHandles::set_enabled(bool z) {
110 if (_enabled != z) {
111 guarantee(z, "can only enable once");
112 _enabled = z;
113 }
114 }
115
116 // MemberName support
117
118 // import java_lang_invoke_MemberName.*
119 enum {
120 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
121 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
122 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
123 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
124 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
125 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
126 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
127 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
128 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
129 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
130 };
131
132 Handle MethodHandles::new_MemberName(TRAPS) {
133 Handle empty;
134 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
135 if (!k->is_initialized()) k->initialize(CHECK_(empty));
136 return Handle(THREAD, k->allocate_instance(THREAD));
137 }
138
139 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
140 // This method is used from java.lang.invoke.MemberName constructors.
141 // It fills in the new MemberName from a java.lang.reflect.Member.
142 Thread* thread = Thread::current();
143 oop target_oop = target();
144 Klass* target_klass = target_oop->klass();
145 if (target_klass == SystemDictionary::reflect_Field_klass()) {
146 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
147 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
148 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
149 if (!k.is_null() && k->oop_is_instance()) {
150 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
151 oop mname2 = init_field_MemberName(mname, fd);
152 if (mname2 != NULL) {
153 // Since we have the reified name and type handy, add them to the result.
154 if (java_lang_invoke_MemberName::name(mname2) == NULL)
155 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
156 if (java_lang_invoke_MemberName::type(mname2) == NULL)
157 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
158 }
159 return mname2;
160 }
161 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
162 oop clazz = java_lang_reflect_Method::clazz(target_oop);
163 int slot = java_lang_reflect_Method::slot(target_oop);
164 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
165 if (!k.is_null() && k->oop_is_instance()) {
166 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
167 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
168 return NULL; // do not resolve unless there is a concrete signature
169 CallInfo info(m, k());
170 return init_method_MemberName(mname, info);
171 }
172 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
173 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
174 int slot = java_lang_reflect_Constructor::slot(target_oop);
175 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
176 if (!k.is_null() && k->oop_is_instance()) {
177 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
178 if (m == NULL) return NULL;
179 CallInfo info(m, k());
180 return init_method_MemberName(mname, info);
181 }
182 }
183 return NULL;
184 }
185
186 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
187 assert(info.resolved_appendix().is_null(), "only normal methods here");
188 methodHandle m = info.resolved_method();
189 assert(m.not_null(), "null method handle");
190 KlassHandle m_klass = m->method_holder();
191 assert(m.not_null(), "null holder for method handle");
192 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
193 int vmindex = Method::invalid_vtable_index;
194
195 switch (info.call_kind()) {
196 case CallInfo::itable_call:
197 vmindex = info.itable_index();
198 // More importantly, the itable index only works with the method holder.
199 assert(m_klass->verify_itable_index(vmindex), "");
200 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
201 if (TraceInvokeDynamic) {
202 ResourceMark rm;
203 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
204 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
205 vmindex);
206 m->access_flags().print_on(tty);
207 if (!m->is_abstract()) {
208 tty->print("default");
209 }
210 tty->cr();
211 }
212 break;
213
214 case CallInfo::vtable_call:
215 vmindex = info.vtable_index();
216 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
217 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
218 if (m_klass->is_interface()) {
219 // This is a vtable call to an interface method (abstract "miranda method" or default method).
220 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
221 // (LinkResolver should help us figure this out.)
222 KlassHandle m_klass_non_interface = info.resolved_klass();
223 if (m_klass_non_interface->is_interface()) {
224 m_klass_non_interface = SystemDictionary::Object_klass();
225 #ifdef ASSERT
226 { ResourceMark rm;
227 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
228 assert(m->name() == m2->name() && m->signature() == m2->signature(),
229 err_msg("at %d, %s != %s", vmindex,
230 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
231 }
232 #endif //ASSERT
233 }
234 if (!m->is_public()) {
235 assert(m->is_public(), "virtual call must be to public interface method");
236 return NULL; // elicit an error later in product build
237 }
238 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
239 m_klass = m_klass_non_interface;
240 }
241 if (TraceInvokeDynamic) {
242 ResourceMark rm;
243 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
244 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
245 m_klass->internal_name(), vmindex);
246 m->access_flags().print_on(tty);
247 if (m->is_default_method()) {
248 tty->print("default");
249 }
250 tty->cr();
251 }
252 break;
253
254 case CallInfo::direct_call:
255 vmindex = Method::nonvirtual_vtable_index;
256 if (m->is_static()) {
257 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
258 } else if (m->is_initializer()) {
259 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
260 } else {
261 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
262 }
263 break;
264
265 default: assert(false, "bad CallInfo"); return NULL;
266 }
267
268 // @CallerSensitive annotation detected
269 if (m->caller_sensitive()) {
270 flags |= CALLER_SENSITIVE;
271 }
272
273 oop mname_oop = mname();
274 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
275 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
276 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
277 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
278 // Note: name and type can be lazily computed by resolve_MemberName,
279 // if Java code needs them as resolved String and MethodType objects.
280 // The clazz must be eagerly stored, because it provides a GC
281 // root to help keep alive the Method*.
282 // If relevant, the vtable or itable value is stored as vmindex.
283 // This is done eagerly, since it is readily available without
284 // constructing any new objects.
285 // TO DO: maybe intern mname_oop
286 if (m->method_holder()->add_member_name(mname)) {
287 return mname();
288 } else {
289 // Redefinition caused this to fail. Return NULL (and an exception?)
290 return NULL;
291 }
292 }
293
294 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
295 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
296 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
297 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
298 Metadata* vmtarget = fd.field_holder();
299 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
300 oop mname_oop = mname();
301 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
302 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
303 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
304 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
305 oop type = field_signature_type_or_null(fd.signature());
306 oop name = field_name_or_null(fd.name());
307 if (name != NULL)
308 java_lang_invoke_MemberName::set_name(mname_oop, name);
309 if (type != NULL)
310 java_lang_invoke_MemberName::set_type(mname_oop, type);
311 // Note: name and type can be lazily computed by resolve_MemberName,
312 // if Java code needs them as resolved String and Class objects.
313 // Note that the incoming type oop might be pre-resolved (non-null).
314 // The base clazz and field offset (vmindex) must be eagerly stored,
315 // because they unambiguously identify the field.
316 // Although the fieldDescriptor::_index would also identify the field,
317 // we do not use it, because it is harder to decode.
318 // TO DO: maybe intern mname_oop
319 return mname();
320 }
321
322 // JVM 2.9 Special Methods:
323 // A method is signature polymorphic if and only if all of the following conditions hold :
324 // * It is declared in the java.lang.invoke.MethodHandle class.
325 // * It has a single formal parameter of type Object[].
326 // * It has a return type of Object.
327 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
328 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
329 if (klass == NULL)
330 return false;
331 // The following test will fail spuriously during bootstrap of MethodHandle itself:
332 // if (klass != SystemDictionary::MethodHandle_klass())
333 // Test the name instead:
334 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
335 return false;
336 Symbol* poly_sig = vmSymbols::object_array_object_signature();
337 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
338 if (m == NULL) return false;
339 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
340 int flags = m->access_flags().as_int();
341 return (flags & required) == required;
342 }
343
344
345 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
346 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
347 switch (iid) {
348 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
349 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
350 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
351 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
352 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
353 }
354 assert(false, "");
355 return 0;
356 }
357
358 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
359 switch (iid) {
360 case vmIntrinsics::_invokeBasic: return 0;
361 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
362 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
363 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
364 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
365 }
366 assert(false, err_msg("iid=%d", iid));
367 return 0;
368 }
369
370 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
371 vmSymbols::SID name_id = vmSymbols::find_sid(name);
372 switch (name_id) {
373 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
374 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
375 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
376 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
377
378 // There is one static signature-polymorphic method for each JVM invocation mode.
379 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
380 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
381 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
382 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
383 }
384
385 // Cover the case of invokeExact and any future variants of invokeFoo.
386 Klass* mh_klass = SystemDictionary::well_known_klass(
387 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
388 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
389 return vmIntrinsics::_invokeGeneric;
390
391 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
392 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
393 return vmIntrinsics::_none;
394 }
395
396 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
397 if (klass != NULL &&
398 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
399 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
400 if (iid != vmIntrinsics::_none)
401 return iid;
402 if (is_method_handle_invoke_name(klass, name))
403 return vmIntrinsics::_invokeGeneric;
404 }
405 return vmIntrinsics::_none;
406 }
407
408
409 // convert the external string or reflective type to an internal signature
410 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
411 if (java_lang_invoke_MethodType::is_instance(type_str)) {
412 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
413 } else if (java_lang_Class::is_instance(type_str)) {
414 return java_lang_Class::as_signature(type_str, false, THREAD);
415 } else if (java_lang_String::is_instance_inlined(type_str)) {
416 if (intern_if_not_found) {
417 return java_lang_String::as_symbol(type_str, THREAD);
418 } else {
419 return java_lang_String::as_symbol_or_null(type_str);
420 }
421 } else {
422 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
423 }
424 }
425
426 static const char OBJ_SIG[] = "Ljava/lang/Object;";
427 enum { OBJ_SIG_LEN = 18 };
428
429 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
430 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
431 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
432 const int len = sig->utf8_length();
433 for (int i = 0; i < len; i++) {
434 switch (sig->byte_at(i)) {
435 case 'L':
436 // only java/lang/Object is valid here
437 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
438 return false;
439 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
440 continue;
441 case '(': case ')': case 'V':
442 case 'I': case 'J': case 'F': case 'D':
443 continue;
444 //case '[':
445 //case 'Z': case 'B': case 'C': case 'S':
446 default:
447 return false;
448 }
449 }
450 return true;
451 }
452
453 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
454 Symbol* bsig = NULL;
455 if (sig == NULL) {
456 return sig;
457 } else if (is_basic_type_signature(sig)) {
458 sig->increment_refcount();
459 return sig; // that was easy
460 } else if (sig->byte_at(0) != '(') {
461 BasicType bt = char2type(sig->byte_at(0));
462 if (is_subword_type(bt)) {
463 bsig = vmSymbols::int_signature();
464 } else {
465 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
466 bsig = vmSymbols::object_signature();
467 }
468 } else {
469 ResourceMark rm;
470 stringStream buffer(128);
471 buffer.put('(');
472 int arg_pos = 0, keep_arg_pos = -1;
473 if (keep_last_arg)
474 keep_arg_pos = ArgumentCount(sig).size() - 1;
475 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
476 BasicType bt = ss.type();
477 size_t this_arg_pos = buffer.size();
478 if (ss.at_return_type()) {
479 buffer.put(')');
480 }
481 if (arg_pos == keep_arg_pos) {
482 buffer.write((char*) ss.raw_bytes(),
483 (int) ss.raw_length());
484 } else if (bt == T_OBJECT || bt == T_ARRAY) {
485 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
486 } else {
487 if (is_subword_type(bt))
488 bt = T_INT;
489 buffer.put(type2char(bt));
490 }
491 arg_pos++;
492 }
493 const char* sigstr = buffer.base();
494 int siglen = (int) buffer.size();
495 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
496 }
497 assert(is_basic_type_signature(bsig) ||
498 // detune assert in case the injected argument is not a basic type:
499 keep_last_arg, "");
500 return bsig;
501 }
502
503 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
504 Symbol* sig,
505 bool keep_arrays,
506 bool keep_basic_names) {
507 st = st ? st : tty;
508 int len = sig->utf8_length();
509 int array = 0;
510 bool prev_type = false;
511 for (int i = 0; i < len; i++) {
512 char ch = sig->byte_at(i);
513 switch (ch) {
514 case '(': case ')':
515 prev_type = false;
516 st->put(ch);
517 continue;
518 case '[':
519 if (!keep_basic_names && keep_arrays)
520 st->put(ch);
521 array++;
522 continue;
523 case 'L':
524 {
525 if (prev_type) st->put(',');
526 int start = i+1, slash = start;
527 while (++i < len && (ch = sig->byte_at(i)) != ';') {
528 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
529 }
530 if (slash < i) start = slash;
531 if (!keep_basic_names) {
532 st->put('L');
533 } else {
534 for (int j = start; j < i; j++)
535 st->put(sig->byte_at(j));
536 prev_type = true;
537 }
538 break;
539 }
540 default:
541 {
542 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
543 ch = '[';
544 array = 0;
545 }
546 if (prev_type) st->put(',');
547 const char* n = NULL;
548 if (keep_basic_names)
549 n = type2name(char2type(ch));
550 if (n == NULL) {
551 // unknown letter, or we don't want to know its name
552 st->put(ch);
553 } else {
554 st->print("%s", n);
555 prev_type = true;
556 }
557 break;
558 }
559 }
560 // Switch break goes here to take care of array suffix:
561 if (prev_type) {
562 while (array > 0) {
563 st->print("[]");
564 --array;
565 }
566 }
567 array = 0;
568 }
569 }
570
571
572
573 static oop object_java_mirror() {
574 return SystemDictionary::Object_klass()->java_mirror();
575 }
576
577 oop MethodHandles::field_name_or_null(Symbol* s) {
578 if (s == NULL) return NULL;
579 return StringTable::lookup(s);
580 }
581
582 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
583 if (s == NULL) return NULL;
584 BasicType bt = FieldType::basic_type(s);
585 if (is_java_primitive(bt)) {
586 assert(s->utf8_length() == 1, "");
587 return java_lang_Class::primitive_mirror(bt);
588 }
589 // Here are some more short cuts for common types.
590 // They are optional, since reference types can be resolved lazily.
591 if (bt == T_OBJECT) {
592 if (s == vmSymbols::object_signature()) {
593 return object_java_mirror();
594 } else if (s == vmSymbols::class_signature()) {
595 return SystemDictionary::Class_klass()->java_mirror();
596 } else if (s == vmSymbols::string_signature()) {
597 return SystemDictionary::String_klass()->java_mirror();
598 }
599 }
600 return NULL;
601 }
602
603
604 // An unresolved member name is a mere symbolic reference.
605 // Resolving it plants a vmtarget/vmindex in it,
606 // which refers directly to JVM internals.
607 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
608 Handle empty;
609 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
610
611 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
612 // Already resolved.
613 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
614 assert(vmindex >= Method::nonvirtual_vtable_index, "");
615 return mname;
616 }
617
618 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
619 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
620 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
621 int flags = java_lang_invoke_MemberName::flags(mname());
622 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
623 if (!ref_kind_is_valid(ref_kind)) {
624 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
625 }
626
627 DEBUG_ONLY(int old_vmindex);
628 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
629
630 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
631 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
632 }
633
634 instanceKlassHandle defc;
635 {
636 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
637 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
638 if (!defc_klass->oop_is_instance()) {
639 if (!defc_klass->oop_is_array()) return empty;
640 defc_klass = SystemDictionary::Object_klass();
641 }
642 defc = instanceKlassHandle(THREAD, defc_klass);
643 }
644 if (defc.is_null()) {
645 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
646 }
647 defc->link_class(CHECK_(empty)); // possible safepoint
648
649 // convert the external string name to an internal symbol
650 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
651 if (name == NULL) return empty; // no such name
652 if (name == vmSymbols::class_initializer_name())
653 return empty; // illegal name
654
655 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
656 if ((flags & ALL_KINDS) == IS_METHOD &&
657 (defc() == SystemDictionary::MethodHandle_klass()) &&
658 (ref_kind == JVM_REF_invokeVirtual ||
659 ref_kind == JVM_REF_invokeSpecial ||
660 // static invocation mode is required for _linkToVirtual, etc.:
661 ref_kind == JVM_REF_invokeStatic)) {
662 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
663 if (iid != vmIntrinsics::_none &&
664 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
665 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
666 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
667 mh_invoke_id = iid;
668 }
669 }
670
671 // convert the external string or reflective type to an internal signature
672 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
673 if (type == NULL) return empty; // no such signature exists in the VM
674
675 // Time to do the lookup.
676 switch (flags & ALL_KINDS) {
677 case IS_METHOD:
678 {
679 CallInfo result;
680 {
681 assert(!HAS_PENDING_EXCEPTION, "");
682 if (ref_kind == JVM_REF_invokeStatic) {
683 LinkResolver::resolve_static_call(result,
684 defc, name, type, caller, caller.not_null(), false, THREAD);
685 } else if (ref_kind == JVM_REF_invokeInterface) {
686 LinkResolver::resolve_interface_call(result, Handle(), defc,
687 defc, name, type, caller, caller.not_null(), false, THREAD);
688 } else if (mh_invoke_id != vmIntrinsics::_none) {
689 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
690 LinkResolver::resolve_handle_call(result,
691 defc, name, type, caller, THREAD);
692 } else if (ref_kind == JVM_REF_invokeSpecial) {
693 LinkResolver::resolve_special_call(result,
694 defc, name, type, caller, caller.not_null(), THREAD);
695 } else if (ref_kind == JVM_REF_invokeVirtual) {
696 LinkResolver::resolve_virtual_call(result, Handle(), defc,
697 defc, name, type, caller, caller.not_null(), false, THREAD);
698 } else {
699 assert(false, err_msg("ref_kind=%d", ref_kind));
700 }
701 if (HAS_PENDING_EXCEPTION) {
702 return empty;
703 }
704 }
705 if (result.resolved_appendix().not_null()) {
706 // The resolved MemberName must not be accompanied by an appendix argument,
707 // since there is no way to bind this value into the MemberName.
708 // Caller is responsible to prevent this from happening.
709 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
710 }
711 oop mname2 = init_method_MemberName(mname, result);
712 return Handle(THREAD, mname2);
713 }
714 case IS_CONSTRUCTOR:
715 {
716 CallInfo result;
717 {
718 assert(!HAS_PENDING_EXCEPTION, "");
719 if (name == vmSymbols::object_initializer_name()) {
720 LinkResolver::resolve_special_call(result,
721 defc, name, type, caller, caller.not_null(), THREAD);
722 } else {
723 break; // will throw after end of switch
724 }
725 if (HAS_PENDING_EXCEPTION) {
726 return empty;
727 }
728 }
729 assert(result.is_statically_bound(), "");
730 oop mname2 = init_method_MemberName(mname, result);
731 return Handle(THREAD, mname2);
732 }
733 case IS_FIELD:
734 {
735 fieldDescriptor result; // find_field initializes fd if found
736 {
737 assert(!HAS_PENDING_EXCEPTION, "");
738 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD);
739 if (HAS_PENDING_EXCEPTION) {
740 return empty;
741 }
742 }
743 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
744 return Handle(THREAD, mname2);
745 }
746 default:
747 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
748 }
749
750 return empty;
751 }
752
753 // Conversely, a member name which is only initialized from JVM internals
754 // may have null defc, name, and type fields.
755 // Resolving it plants a vmtarget/vmindex in it,
756 // which refers directly to JVM internals.
757 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
758 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
759 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
760 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
761 if (vmtarget == NULL) {
762 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
763 }
764
765 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
766 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
767 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
768 int flags = java_lang_invoke_MemberName::flags(mname());
769
770 if (suppress != 0) {
771 if (suppress & _suppress_defc) have_defc = true;
772 if (suppress & _suppress_name) have_name = true;
773 if (suppress & _suppress_type) have_type = true;
774 }
775
776 if (have_defc && have_name && have_type) return; // nothing needed
777
778 switch (flags & ALL_KINDS) {
779 case IS_METHOD:
780 case IS_CONSTRUCTOR:
781 {
782 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
783 methodHandle m(THREAD, (Method*)vmtarget);
784 DEBUG_ONLY(vmtarget = NULL); // safety
785 if (m.is_null()) break;
786 if (!have_defc) {
787 InstanceKlass* defc = m->method_holder();
788 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
789 }
790 if (!have_name) {
791 //not java_lang_String::create_from_symbol; let's intern member names
792 Handle name = StringTable::intern(m->name(), CHECK);
793 java_lang_invoke_MemberName::set_name(mname(), name());
794 }
795 if (!have_type) {
796 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
797 java_lang_invoke_MemberName::set_type(mname(), type());
798 }
799 return;
800 }
801 case IS_FIELD:
802 {
803 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
804 if (!((Klass*) vmtarget)->oop_is_instance()) break;
805 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
806 DEBUG_ONLY(vmtarget = NULL); // safety
807 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
808 fieldDescriptor fd; // find_field initializes fd if found
809 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
810 break; // cannot expand
811 if (!have_defc) {
812 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
813 }
814 if (!have_name) {
815 //not java_lang_String::create_from_symbol; let's intern member names
816 Handle name = StringTable::intern(fd.name(), CHECK);
817 java_lang_invoke_MemberName::set_name(mname(), name());
818 }
819 if (!have_type) {
820 // If it is a primitive field type, don't mess with short strings like "I".
821 Handle type = field_signature_type_or_null(fd.signature());
822 if (type.is_null()) {
823 java_lang_String::create_from_symbol(fd.signature(), CHECK);
824 }
825 java_lang_invoke_MemberName::set_type(mname(), type());
826 }
827 return;
828 }
829 }
830 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
831 }
832
833 int MethodHandles::find_MemberNames(KlassHandle k,
834 Symbol* name, Symbol* sig,
835 int mflags, KlassHandle caller,
836 int skip, objArrayHandle results) {
837 // %%% take caller into account!
838
839 Thread* thread = Thread::current();
840
841 if (k.is_null() || !k->oop_is_instance()) return -1;
842
843 int rfill = 0, rlimit = results->length(), rskip = skip;
844 // overflow measurement:
845 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
846
847 int match_flags = mflags;
848 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
849 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
850 bool local_only = !(search_superc | search_intfc);
851 bool classes_only = false;
852
853 if (name != NULL) {
854 if (name->utf8_length() == 0) return 0; // a match is not possible
855 }
856 if (sig != NULL) {
857 if (sig->utf8_length() == 0) return 0; // a match is not possible
858 if (sig->byte_at(0) == '(')
859 match_flags &= ~(IS_FIELD | IS_TYPE);
860 else
861 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
862 }
863
864 if ((match_flags & IS_TYPE) != 0) {
865 // NYI, and Core Reflection works quite well for this query
866 }
867
868 if ((match_flags & IS_FIELD) != 0) {
869 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
870 if (name != NULL && st.name() != name)
871 continue;
872 if (sig != NULL && st.signature() != sig)
873 continue;
874 // passed the filters
875 if (rskip > 0) {
876 --rskip;
877 } else if (rfill < rlimit) {
878 Handle result(thread, results->obj_at(rfill++));
879 if (!java_lang_invoke_MemberName::is_instance(result()))
880 return -99; // caller bug!
881 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
882 if (saved != result())
883 results->obj_at_put(rfill-1, saved); // show saved instance to user
884 } else if (++overflow >= overflow_limit) {
885 match_flags = 0; break; // got tired of looking at overflow
886 }
887 }
888 }
889
890 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
891 // watch out for these guys:
892 Symbol* init_name = vmSymbols::object_initializer_name();
893 Symbol* clinit_name = vmSymbols::class_initializer_name();
894 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
895 bool negate_name_test = false;
896 // fix name so that it captures the intention of IS_CONSTRUCTOR
897 if (!(match_flags & IS_METHOD)) {
898 // constructors only
899 if (name == NULL) {
900 name = init_name;
901 } else if (name != init_name) {
902 return 0; // no constructors of this method name
903 }
904 } else if (!(match_flags & IS_CONSTRUCTOR)) {
905 // methods only
906 if (name == NULL) {
907 name = init_name;
908 negate_name_test = true; // if we see the name, we *omit* the entry
909 } else if (name == init_name) {
910 return 0; // no methods of this constructor name
911 }
912 } else {
913 // caller will accept either sort; no need to adjust name
914 }
915 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
916 Method* m = st.method();
917 Symbol* m_name = m->name();
918 if (m_name == clinit_name)
919 continue;
920 if (name != NULL && ((m_name != name) ^ negate_name_test))
921 continue;
922 if (sig != NULL && m->signature() != sig)
923 continue;
924 // passed the filters
925 if (rskip > 0) {
926 --rskip;
927 } else if (rfill < rlimit) {
928 Handle result(thread, results->obj_at(rfill++));
929 if (!java_lang_invoke_MemberName::is_instance(result()))
930 return -99; // caller bug!
931 CallInfo info(m);
932 oop saved = MethodHandles::init_method_MemberName(result, info);
933 if (saved != result())
934 results->obj_at_put(rfill-1, saved); // show saved instance to user
935 } else if (++overflow >= overflow_limit) {
936 match_flags = 0; break; // got tired of looking at overflow
937 }
938 }
939 }
940
941 // return number of elements we at leasted wanted to initialize
942 return rfill + overflow;
943 }
944
945 // Get context class for a CallSite instance: either extract existing context or use default one.
946 InstanceKlass* MethodHandles::get_call_site_context(oop call_site) {
947 // In order to extract a context the following traversal is performed:
948 // CallSite.context => Cleaner.referent => Class._klass => Klass
949 assert(java_lang_invoke_CallSite::is_instance(call_site), "");
950 oop context_oop = java_lang_invoke_CallSite::context_volatile(call_site);
951 if (oopDesc::is_null(context_oop)) {
952 return NULL; // The context hasn't been initialized yet.
953 }
954 oop context_class_oop = java_lang_ref_Reference::referent(context_oop);
955 if (oopDesc::is_null(context_class_oop)) {
956 // The context reference was cleared by GC, so current dependency context
957 // isn't usable anymore. Context should be fetched from CallSite again.
958 return NULL;
959 }
960 return InstanceKlass::cast(java_lang_Class::as_Klass(context_class_oop));
961 }
962
963 //------------------------------------------------------------------------------
964 // MemberNameTable
965 //
966
967 MemberNameTable::MemberNameTable(int methods_cnt)
968 : GrowableArray<jweak>(methods_cnt, true) {
969 assert_locked_or_safepoint(MemberNameTable_lock);
970 }
971
972 MemberNameTable::~MemberNameTable() {
973 assert_locked_or_safepoint(MemberNameTable_lock);
974 int len = this->length();
975
976 for (int idx = 0; idx < len; idx++) {
977 jweak ref = this->at(idx);
978 JNIHandles::destroy_weak_global(ref);
979 }
980 }
981
982 void MemberNameTable::add_member_name(jweak mem_name_wref) {
983 assert_locked_or_safepoint(MemberNameTable_lock);
984 this->push(mem_name_wref);
985 }
986
987 #if INCLUDE_JVMTI
988 // It is called at safepoint only for RedefineClasses
989 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) {
990 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
991 // For each redefined method
992 for (int idx = 0; idx < length(); idx++) {
993 oop mem_name = JNIHandles::resolve(this->at(idx));
994 if (mem_name == NULL) {
995 continue;
996 }
997 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
998
999 if (old_method == NULL || !old_method->is_old()) {
1000 continue; // skip uninteresting entries
1001 }
1002 if (old_method->is_deleted()) {
1003 // skip entries with deleted methods
1004 continue;
1005 }
1006 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum());
1007
1008 assert(new_method != NULL, "method_with_idnum() should not be NULL");
1009 assert(old_method != new_method, "sanity check");
1010
1011 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method);
1012
1013 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1014 if (!(*trace_name_printed)) {
1015 // RC_TRACE_MESG macro has an embedded ResourceMark
1016 RC_TRACE_MESG(("adjust: name=%s",
1017 old_method->method_holder()->external_name()));
1018 *trace_name_printed = true;
1019 }
1020 // RC_TRACE macro has an embedded ResourceMark
1021 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
1022 new_method->name()->as_C_string(),
1023 new_method->signature()->as_C_string()));
1024 }
1025 }
1026 }
1027 #endif // INCLUDE_JVMTI
1028
1029 //
1030 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1031 // They are the private interface between this JVM and the HotSpot-specific
1032 // Java code that implements JSR 292 method handles.
1033 //
1034 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1035 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1036 //
1037
1038 #ifndef PRODUCT
1039 #define EACH_NAMED_CON(template, requirement) \
1040 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1041 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1042 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1043 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1044 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1045 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1046 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1047 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1048 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1049 /*end*/
1050
1051 #define IGNORE_REQ(req_expr) /* req_expr */
1052 #define ONE_PLUS(scope,value) 1+
1053 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1054 #define VALUE_COMMA(scope,value) scope::value,
1055 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1056 #define STRING_NULL(scope,value) #value "\0"
1057 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1058
1059 static bool advertise_con_value(int which) {
1060 if (which < 0) return false;
1061 bool ok = true;
1062 int count = 0;
1063 #define INC_COUNT(scope,value) \
1064 ++count;
1065 #define CHECK_REQ(req_expr) \
1066 if (which < count) return ok; \
1067 ok = (req_expr);
1068 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1069 #undef INC_COUNT
1070 #undef CHECK_REQ
1071 assert(count == con_value_count, "");
1072 if (which < count) return ok;
1073 return false;
1074 }
1075
1076 #undef ONE_PLUS
1077 #undef VALUE_COMMA
1078 #undef STRING_NULL
1079 #undef EACH_NAMED_CON
1080 #endif // PRODUCT
1081
1082 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1083 #ifndef PRODUCT
1084 if (advertise_con_value(which)) {
1085 assert(which >= 0 && which < con_value_count, "");
1086 int con = con_values[which];
1087 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1088 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1089 const char* str = &con_names[0];
1090 for (int i = 0; i < which; i++)
1091 str += strlen(str) + 1; // skip name and null
1092 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1093 box->obj_at_put(0, name);
1094 }
1095 return con;
1096 }
1097 #endif
1098 return 0;
1099 }
1100 JVM_END
1101
1102 // void init(MemberName self, AccessibleObject ref)
1103 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1104 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1105 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1106 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1107 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1108 MethodHandles::init_MemberName(mname, target);
1109 }
1110 JVM_END
1111
1112 // void expand(MemberName self)
1113 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1114 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1115 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1116 MethodHandles::expand_MemberName(mname, 0, CHECK);
1117 }
1118 JVM_END
1119
1120 // void resolve(MemberName self, Class<?> caller)
1121 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1122 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1123 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1124
1125 // The trusted Java code that calls this method should already have performed
1126 // access checks on behalf of the given caller. But, we can verify this.
1127 if (VerifyMethodHandles && caller_jh != NULL &&
1128 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1129 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1130 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1131 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1132 }
1133
1134 // Reflection::verify_class_access can only handle instance classes.
1135 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1136 // Emulate LinkResolver::check_klass_accessability.
1137 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1138 if (!Reflection::verify_class_access(caller,
1139 reference_klass,
1140 true)) {
1141 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1142 }
1143 }
1144 }
1145
1146 KlassHandle caller(THREAD,
1147 caller_jh == NULL ? (Klass*) NULL :
1148 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1149 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1150
1151 if (resolved.is_null()) {
1152 int flags = java_lang_invoke_MemberName::flags(mname());
1153 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1154 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1155 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1156 }
1157 if ((flags & ALL_KINDS) == IS_FIELD) {
1158 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1159 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1160 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1161 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1162 } else {
1163 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1164 }
1165 }
1166
1167 return JNIHandles::make_local(THREAD, resolved());
1168 }
1169 JVM_END
1170
1171 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1172 if (mname == NULL ||
1173 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1174 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1175 } else {
1176 int flags = java_lang_invoke_MemberName::flags(mname);
1177 if ((flags & IS_FIELD) != 0 &&
1178 (must_be_static
1179 ? (flags & JVM_ACC_STATIC) != 0
1180 : (flags & JVM_ACC_STATIC) == 0)) {
1181 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1182 return (jlong) vmindex;
1183 }
1184 }
1185 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1186 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1187 return 0;
1188 }
1189
1190 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1191 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1192 }
1193 JVM_END
1194
1195 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1196 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1197 }
1198 JVM_END
1199
1200 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1201 // use the other function to perform sanity checks:
1202 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1203 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1204 return JNIHandles::make_local(THREAD, clazz);
1205 }
1206 JVM_END
1207
1208 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1209 if (mname_jh == NULL) return NULL;
1210 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1211 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1212 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1213 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1214 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1215 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1216 result->obj_at_put(0, x);
1217 x = NULL;
1218 if (vmtarget == NULL) {
1219 x = NULL;
1220 } else if (vmtarget->is_klass()) {
1221 x = ((Klass*) vmtarget)->java_mirror();
1222 } else if (vmtarget->is_method()) {
1223 x = mname();
1224 }
1225 result->obj_at_put(1, x);
1226 return JNIHandles::make_local(env, result());
1227 }
1228 JVM_END
1229
1230
1231
1232 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1233 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1234 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1235 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1236 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1237 if (clazz_jh == NULL || results_jh == NULL) return -1;
1238 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1239
1240 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1241 if (results.is_null() || !results->is_objArray()) return -1;
1242
1243 TempNewSymbol name = NULL;
1244 TempNewSymbol sig = NULL;
1245 if (name_jh != NULL) {
1246 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1247 if (name == NULL) return 0; // a match is not possible
1248 }
1249 if (sig_jh != NULL) {
1250 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1251 if (sig == NULL) return 0; // a match is not possible
1252 }
1253
1254 KlassHandle caller;
1255 if (caller_jh != NULL) {
1256 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1257 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1258 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1259 }
1260
1261 if (name != NULL && sig != NULL && results.not_null()) {
1262 // try a direct resolve
1263 // %%% TO DO
1264 }
1265
1266 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1267 caller, skip, results);
1268 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1269 return res;
1270 }
1271 JVM_END
1272
1273 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1274 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1275 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1276 {
1277 // Walk all nmethods depending on this call site.
1278 MutexLocker mu(Compile_lock, thread);
1279 CodeCache::flush_dependents_on(call_site, target);
1280 java_lang_invoke_CallSite::set_target(call_site(), target());
1281 }
1282 }
1283 JVM_END
1284
1285 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1286 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1287 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1288 {
1289 // Walk all nmethods depending on this call site.
1290 MutexLocker mu(Compile_lock, thread);
1291 CodeCache::flush_dependents_on(call_site, target);
1292 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1293 }
1294 }
1295 JVM_END
1296
1297 JVM_ENTRY(void, MHN_invalidateDependentNMethods(JNIEnv* env, jobject igcls, jobject call_site_jh)) {
1298 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1299 {
1300 // Walk all nmethods depending on this call site.
1301 MutexLocker mu1(Compile_lock, thread);
1302
1303 CallSiteDepChange changes(call_site(), Handle());
1304
1305 InstanceKlass* ctxk = MethodHandles::get_call_site_context(call_site());
1306 if (ctxk == NULL) {
1307 return; // No dependencies to invalidate yet.
1308 }
1309 int marked = 0;
1310 {
1311 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1312 marked = ctxk->mark_dependent_nmethods(changes);
1313 }
1314 java_lang_invoke_CallSite::set_context_volatile(call_site(), NULL); // Reset call site to initial state
1315 if (marked > 0) {
1316 // At least one nmethod has been marked for deoptimization
1317 VM_Deoptimize op;
1318 VMThread::execute(&op);
1319 }
1320 }
1321 }
1322 JVM_END
1323
1324 /**
1325 * Throws a java/lang/UnsupportedOperationException unconditionally.
1326 * This is required by the specification of MethodHandle.invoke if
1327 * invoked directly.
1328 */
1329 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1330 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1331 return NULL;
1332 }
1333 JVM_END
1334
1335 /**
1336 * Throws a java/lang/UnsupportedOperationException unconditionally.
1337 * This is required by the specification of MethodHandle.invokeExact if
1338 * invoked directly.
1339 */
1340 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1341 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1342 return NULL;
1343 }
1344 JVM_END
1345
1346 /// JVM_RegisterMethodHandleMethods
1347
1348 #undef CS // Solaris builds complain
1349
1350 #define LANG "Ljava/lang/"
1351 #define JLINV "Ljava/lang/invoke/"
1352
1353 #define OBJ LANG "Object;"
1354 #define CLS LANG "Class;"
1355 #define STRG LANG "String;"
1356 #define CS JLINV "CallSite;"
1357 #define MT JLINV "MethodType;"
1358 #define MH JLINV "MethodHandle;"
1359 #define MEM JLINV "MemberName;"
1360
1361 #define CC (char*) /*cast a literal from (const char*)*/
1362 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1363
1364 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1365 static JNINativeMethod MHN_methods[] = {
1366 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1367 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1368 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)},
1369 // static native int getNamedCon(int which, Object[] name)
1370 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1371 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1372 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1373 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1374 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1375 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1376 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1377 {CC "invalidateDependentNMethods", CC "(" CS ")V", FN_PTR(MHN_invalidateDependentNMethods)},
1378 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1379 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1380 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1381 };
1382
1383 static JNINativeMethod MH_methods[] = {
1384 // UnsupportedOperationException throwers
1385 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1386 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1387 };
1388
1389 /**
1390 * Helper method to register native methods.
1391 */
1392 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1393 int status = env->RegisterNatives(clazz, methods, nMethods);
1394 if (status != JNI_OK || env->ExceptionOccurred()) {
1395 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1396 env->ExceptionClear();
1397 return false;
1398 }
1399 return true;
1400 }
1401
1402 /**
1403 * This one function is exported, used by NativeLookup.
1404 */
1405 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1406 assert(!MethodHandles::enabled(), "must not be enabled");
1407 bool enable_MH = true;
1408
1409 jclass MH_class = NULL;
1410 if (SystemDictionary::MethodHandle_klass() == NULL) {
1411 enable_MH = false;
1412 } else {
1413 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1414 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1415 }
1416
1417 if (enable_MH) {
1418 ThreadToNativeFromVM ttnfv(thread);
1419
1420 if (enable_MH) {
1421 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1422 }
1423 if (enable_MH) {
1424 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1425 }
1426 }
1427
1428 if (TraceInvokeDynamic) {
1429 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1430 }
1431
1432 if (enable_MH) {
1433 if (MethodHandles::generate_adapters() == false) {
1434 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters");
1435 }
1436 MethodHandles::set_enabled(true);
1437 }
1438 }
1439 JVM_END