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 KlassHandle m_klass = m->method_holder();
190 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
191 int vmindex = Method::invalid_vtable_index;
192
193 switch (info.call_kind()) {
194 case CallInfo::itable_call:
195 vmindex = info.itable_index();
196 // More importantly, the itable index only works with the method holder.
197 assert(m_klass->verify_itable_index(vmindex), "");
198 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
199 if (TraceInvokeDynamic) {
200 ResourceMark rm;
201 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
202 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
203 vmindex);
204 m->access_flags().print_on(tty);
205 if (!m->is_abstract()) {
206 tty->print("default");
207 }
208 tty->cr();
209 }
210 break;
211
212 case CallInfo::vtable_call:
213 vmindex = info.vtable_index();
214 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
215 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
216 if (m_klass->is_interface()) {
217 // This is a vtable call to an interface method (abstract "miranda method" or default method).
218 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
219 // (LinkResolver should help us figure this out.)
220 KlassHandle m_klass_non_interface = info.resolved_klass();
221 if (m_klass_non_interface->is_interface()) {
222 m_klass_non_interface = SystemDictionary::Object_klass();
223 #ifdef ASSERT
224 { ResourceMark rm;
225 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
226 assert(m->name() == m2->name() && m->signature() == m2->signature(),
227 err_msg("at %d, %s != %s", vmindex,
228 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
229 }
230 #endif //ASSERT
231 }
232 if (!m->is_public()) {
233 assert(m->is_public(), "virtual call must be to public interface method");
234 return NULL; // elicit an error later in product build
235 }
236 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
237 m_klass = m_klass_non_interface;
238 }
239 if (TraceInvokeDynamic) {
240 ResourceMark rm;
241 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
242 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
243 m_klass->internal_name(), vmindex);
244 m->access_flags().print_on(tty);
245 if (m->is_default_method()) {
246 tty->print("default");
247 }
248 tty->cr();
249 }
250 break;
251
252 case CallInfo::direct_call:
253 vmindex = Method::nonvirtual_vtable_index;
254 if (m->is_static()) {
255 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
256 } else if (m->is_initializer()) {
257 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
258 } else {
259 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
260 }
261 break;
262
263 default: assert(false, "bad CallInfo"); return NULL;
264 }
265
266 // @CallerSensitive annotation detected
267 if (m->caller_sensitive()) {
268 flags |= CALLER_SENSITIVE;
269 }
270
271 oop mname_oop = mname();
272 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
273 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
274 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
275 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
276 // Note: name and type can be lazily computed by resolve_MemberName,
277 // if Java code needs them as resolved String and MethodType objects.
278 // The clazz must be eagerly stored, because it provides a GC
279 // root to help keep alive the Method*.
280 // If relevant, the vtable or itable value is stored as vmindex.
281 // This is done eagerly, since it is readily available without
282 // constructing any new objects.
283 // TO DO: maybe intern mname_oop
284 if (m->method_holder()->add_member_name(mname)) {
285 return mname();
286 } else {
287 // Redefinition caused this to fail. Return NULL (and an exception?)
288 return NULL;
289 }
290 }
291
292 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
293 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
294 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
295 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
296 Metadata* vmtarget = fd.field_holder();
297 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
298 oop mname_oop = mname();
299 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
300 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
301 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
302 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
303 oop type = field_signature_type_or_null(fd.signature());
304 oop name = field_name_or_null(fd.name());
305 if (name != NULL)
306 java_lang_invoke_MemberName::set_name(mname_oop, name);
307 if (type != NULL)
308 java_lang_invoke_MemberName::set_type(mname_oop, type);
309 // Note: name and type can be lazily computed by resolve_MemberName,
310 // if Java code needs them as resolved String and Class objects.
311 // Note that the incoming type oop might be pre-resolved (non-null).
312 // The base clazz and field offset (vmindex) must be eagerly stored,
313 // because they unambiguously identify the field.
314 // Although the fieldDescriptor::_index would also identify the field,
315 // we do not use it, because it is harder to decode.
316 // TO DO: maybe intern mname_oop
317 return mname();
318 }
319
320 // JVM 2.9 Special Methods:
321 // A method is signature polymorphic if and only if all of the following conditions hold :
322 // * It is declared in the java.lang.invoke.MethodHandle class.
323 // * It has a single formal parameter of type Object[].
324 // * It has a return type of Object.
325 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
326 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
327 if (klass == NULL)
328 return false;
329 // The following test will fail spuriously during bootstrap of MethodHandle itself:
330 // if (klass != SystemDictionary::MethodHandle_klass())
331 // Test the name instead:
332 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
333 return false;
334 Symbol* poly_sig = vmSymbols::object_array_object_signature();
335 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
336 if (m == NULL) return false;
337 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
338 int flags = m->access_flags().as_int();
339 return (flags & required) == required;
340 }
341
342
343 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
344 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
345 switch (iid) {
346 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
347 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
348 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
349 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
350 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
351 }
352 assert(false, "");
353 return 0;
354 }
355
356 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
357 switch (iid) {
358 case vmIntrinsics::_invokeBasic: return 0;
359 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
360 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
361 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
362 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
363 }
364 assert(false, err_msg("iid=%d", iid));
365 return 0;
366 }
367
368 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
369 vmSymbols::SID name_id = vmSymbols::find_sid(name);
370 switch (name_id) {
371 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
372 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
373 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
374 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
375
376 // There is one static signature-polymorphic method for each JVM invocation mode.
377 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
378 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
379 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
380 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
381 }
382
383 // Cover the case of invokeExact and any future variants of invokeFoo.
384 Klass* mh_klass = SystemDictionary::well_known_klass(
385 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
386 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
387 return vmIntrinsics::_invokeGeneric;
388
389 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
390 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
391 return vmIntrinsics::_none;
392 }
393
394 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
395 if (klass != NULL &&
396 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
397 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
398 if (iid != vmIntrinsics::_none)
399 return iid;
400 if (is_method_handle_invoke_name(klass, name))
401 return vmIntrinsics::_invokeGeneric;
402 }
403 return vmIntrinsics::_none;
404 }
405
406
407 // convert the external string or reflective type to an internal signature
408 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
409 if (java_lang_invoke_MethodType::is_instance(type_str)) {
410 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
411 } else if (java_lang_Class::is_instance(type_str)) {
412 return java_lang_Class::as_signature(type_str, false, THREAD);
413 } else if (java_lang_String::is_instance_inlined(type_str)) {
414 if (intern_if_not_found) {
415 return java_lang_String::as_symbol(type_str, THREAD);
416 } else {
417 return java_lang_String::as_symbol_or_null(type_str);
418 }
419 } else {
420 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
421 }
422 }
423
424 static const char OBJ_SIG[] = "Ljava/lang/Object;";
425 enum { OBJ_SIG_LEN = 18 };
426
427 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
428 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
429 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
430 const int len = sig->utf8_length();
431 for (int i = 0; i < len; i++) {
432 switch (sig->byte_at(i)) {
433 case 'L':
434 // only java/lang/Object is valid here
435 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
436 return false;
437 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
438 continue;
439 case '(': case ')': case 'V':
440 case 'I': case 'J': case 'F': case 'D':
441 continue;
442 //case '[':
443 //case 'Z': case 'B': case 'C': case 'S':
444 default:
445 return false;
446 }
447 }
448 return true;
449 }
450
451 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
452 Symbol* bsig = NULL;
453 if (sig == NULL) {
454 return sig;
455 } else if (is_basic_type_signature(sig)) {
456 sig->increment_refcount();
457 return sig; // that was easy
458 } else if (sig->byte_at(0) != '(') {
459 BasicType bt = char2type(sig->byte_at(0));
460 if (is_subword_type(bt)) {
461 bsig = vmSymbols::int_signature();
462 } else {
463 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
464 bsig = vmSymbols::object_signature();
465 }
466 } else {
467 ResourceMark rm;
468 stringStream buffer(128);
469 buffer.put('(');
470 int arg_pos = 0, keep_arg_pos = -1;
471 if (keep_last_arg)
472 keep_arg_pos = ArgumentCount(sig).size() - 1;
473 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
474 BasicType bt = ss.type();
475 size_t this_arg_pos = buffer.size();
476 if (ss.at_return_type()) {
477 buffer.put(')');
478 }
479 if (arg_pos == keep_arg_pos) {
480 buffer.write((char*) ss.raw_bytes(),
481 (int) ss.raw_length());
482 } else if (bt == T_OBJECT || bt == T_ARRAY) {
483 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
484 } else {
485 if (is_subword_type(bt))
486 bt = T_INT;
487 buffer.put(type2char(bt));
488 }
489 arg_pos++;
490 }
491 const char* sigstr = buffer.base();
492 int siglen = (int) buffer.size();
493 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
494 }
495 assert(is_basic_type_signature(bsig) ||
496 // detune assert in case the injected argument is not a basic type:
497 keep_last_arg, "");
498 return bsig;
499 }
500
501 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
502 Symbol* sig,
503 bool keep_arrays,
504 bool keep_basic_names) {
505 st = st ? st : tty;
506 int len = sig->utf8_length();
507 int array = 0;
508 bool prev_type = false;
509 for (int i = 0; i < len; i++) {
510 char ch = sig->byte_at(i);
511 switch (ch) {
512 case '(': case ')':
513 prev_type = false;
514 st->put(ch);
515 continue;
516 case '[':
517 if (!keep_basic_names && keep_arrays)
518 st->put(ch);
519 array++;
520 continue;
521 case 'L':
522 {
523 if (prev_type) st->put(',');
524 int start = i+1, slash = start;
525 while (++i < len && (ch = sig->byte_at(i)) != ';') {
526 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
527 }
528 if (slash < i) start = slash;
529 if (!keep_basic_names) {
530 st->put('L');
531 } else {
532 for (int j = start; j < i; j++)
533 st->put(sig->byte_at(j));
534 prev_type = true;
535 }
536 break;
537 }
538 default:
539 {
540 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
541 ch = '[';
542 array = 0;
543 }
544 if (prev_type) st->put(',');
545 const char* n = NULL;
546 if (keep_basic_names)
547 n = type2name(char2type(ch));
548 if (n == NULL) {
549 // unknown letter, or we don't want to know its name
550 st->put(ch);
551 } else {
552 st->print("%s", n);
553 prev_type = true;
554 }
555 break;
556 }
557 }
558 // Switch break goes here to take care of array suffix:
559 if (prev_type) {
560 while (array > 0) {
561 st->print("[]");
562 --array;
563 }
564 }
565 array = 0;
566 }
567 }
568
569
570
571 static oop object_java_mirror() {
572 return SystemDictionary::Object_klass()->java_mirror();
573 }
574
575 oop MethodHandles::field_name_or_null(Symbol* s) {
576 if (s == NULL) return NULL;
577 return StringTable::lookup(s);
578 }
579
580 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
581 if (s == NULL) return NULL;
582 BasicType bt = FieldType::basic_type(s);
583 if (is_java_primitive(bt)) {
584 assert(s->utf8_length() == 1, "");
585 return java_lang_Class::primitive_mirror(bt);
586 }
587 // Here are some more short cuts for common types.
588 // They are optional, since reference types can be resolved lazily.
589 if (bt == T_OBJECT) {
590 if (s == vmSymbols::object_signature()) {
591 return object_java_mirror();
592 } else if (s == vmSymbols::class_signature()) {
593 return SystemDictionary::Class_klass()->java_mirror();
594 } else if (s == vmSymbols::string_signature()) {
595 return SystemDictionary::String_klass()->java_mirror();
596 }
597 }
598 return NULL;
599 }
600
601
602 // An unresolved member name is a mere symbolic reference.
603 // Resolving it plants a vmtarget/vmindex in it,
604 // which refers directly to JVM internals.
605 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
606 Handle empty;
607 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
608
609 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
610 // Already resolved.
611 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
612 assert(vmindex >= Method::nonvirtual_vtable_index, "");
613 return mname;
614 }
615
616 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
617 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
618 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
619 int flags = java_lang_invoke_MemberName::flags(mname());
620 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
621 if (!ref_kind_is_valid(ref_kind)) {
622 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
623 }
624
625 DEBUG_ONLY(int old_vmindex);
626 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
627
628 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
629 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
630 }
631
632 instanceKlassHandle defc;
633 {
634 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
635 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
636 if (!defc_klass->oop_is_instance()) {
637 if (!defc_klass->oop_is_array()) return empty;
638 defc_klass = SystemDictionary::Object_klass();
639 }
640 defc = instanceKlassHandle(THREAD, defc_klass);
641 }
642 if (defc.is_null()) {
643 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
644 }
645 defc->link_class(CHECK_(empty)); // possible safepoint
646
647 // convert the external string name to an internal symbol
648 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
649 if (name == NULL) return empty; // no such name
650 if (name == vmSymbols::class_initializer_name())
651 return empty; // illegal name
652
653 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
654 if ((flags & ALL_KINDS) == IS_METHOD &&
655 (defc() == SystemDictionary::MethodHandle_klass()) &&
656 (ref_kind == JVM_REF_invokeVirtual ||
657 ref_kind == JVM_REF_invokeSpecial ||
658 // static invocation mode is required for _linkToVirtual, etc.:
659 ref_kind == JVM_REF_invokeStatic)) {
660 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
661 if (iid != vmIntrinsics::_none &&
662 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
663 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
664 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
665 mh_invoke_id = iid;
666 }
667 }
668
669 // convert the external string or reflective type to an internal signature
670 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
671 if (type == NULL) return empty; // no such signature exists in the VM
672
673 // Time to do the lookup.
674 switch (flags & ALL_KINDS) {
675 case IS_METHOD:
676 {
677 CallInfo result;
678 {
679 assert(!HAS_PENDING_EXCEPTION, "");
680 if (ref_kind == JVM_REF_invokeStatic) {
681 LinkResolver::resolve_static_call(result,
682 defc, name, type, caller, caller.not_null(), false, THREAD);
683 } else if (ref_kind == JVM_REF_invokeInterface) {
684 LinkResolver::resolve_interface_call(result, Handle(), defc,
685 defc, name, type, caller, caller.not_null(), false, THREAD);
686 } else if (mh_invoke_id != vmIntrinsics::_none) {
687 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
688 LinkResolver::resolve_handle_call(result,
689 defc, name, type, caller, THREAD);
690 } else if (ref_kind == JVM_REF_invokeSpecial) {
691 LinkResolver::resolve_special_call(result,
692 defc, name, type, caller, caller.not_null(), THREAD);
693 } else if (ref_kind == JVM_REF_invokeVirtual) {
694 LinkResolver::resolve_virtual_call(result, Handle(), defc,
695 defc, name, type, caller, caller.not_null(), false, THREAD);
696 } else {
697 assert(false, err_msg("ref_kind=%d", ref_kind));
698 }
699 if (HAS_PENDING_EXCEPTION) {
700 return empty;
701 }
702 }
703 if (result.resolved_appendix().not_null()) {
704 // The resolved MemberName must not be accompanied by an appendix argument,
705 // since there is no way to bind this value into the MemberName.
706 // Caller is responsible to prevent this from happening.
707 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
708 }
709 oop mname2 = init_method_MemberName(mname, result);
710 return Handle(THREAD, mname2);
711 }
712 case IS_CONSTRUCTOR:
713 {
714 CallInfo result;
715 {
716 assert(!HAS_PENDING_EXCEPTION, "");
717 if (name == vmSymbols::object_initializer_name()) {
718 LinkResolver::resolve_special_call(result,
719 defc, name, type, caller, caller.not_null(), THREAD);
720 } else {
721 break; // will throw after end of switch
722 }
723 if (HAS_PENDING_EXCEPTION) {
724 return empty;
725 }
726 }
727 assert(result.is_statically_bound(), "");
728 oop mname2 = init_method_MemberName(mname, result);
729 return Handle(THREAD, mname2);
730 }
731 case IS_FIELD:
732 {
733 fieldDescriptor result; // find_field initializes fd if found
734 {
735 assert(!HAS_PENDING_EXCEPTION, "");
736 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD);
737 if (HAS_PENDING_EXCEPTION) {
738 return empty;
739 }
740 }
741 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
742 return Handle(THREAD, mname2);
743 }
744 default:
745 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
746 }
747
748 return empty;
749 }
750
751 // Conversely, a member name which is only initialized from JVM internals
752 // may have null defc, name, and type fields.
753 // Resolving it plants a vmtarget/vmindex in it,
754 // which refers directly to JVM internals.
755 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
756 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
757 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
758 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
759 if (vmtarget == NULL) {
760 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
761 }
762
763 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
764 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
765 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
766 int flags = java_lang_invoke_MemberName::flags(mname());
767
768 if (suppress != 0) {
769 if (suppress & _suppress_defc) have_defc = true;
770 if (suppress & _suppress_name) have_name = true;
771 if (suppress & _suppress_type) have_type = true;
772 }
773
774 if (have_defc && have_name && have_type) return; // nothing needed
775
776 switch (flags & ALL_KINDS) {
777 case IS_METHOD:
778 case IS_CONSTRUCTOR:
779 {
780 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
781 methodHandle m(THREAD, (Method*)vmtarget);
782 DEBUG_ONLY(vmtarget = NULL); // safety
783 if (m.is_null()) break;
784 if (!have_defc) {
785 InstanceKlass* defc = m->method_holder();
786 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
787 }
788 if (!have_name) {
789 //not java_lang_String::create_from_symbol; let's intern member names
790 Handle name = StringTable::intern(m->name(), CHECK);
791 java_lang_invoke_MemberName::set_name(mname(), name());
792 }
793 if (!have_type) {
794 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
795 java_lang_invoke_MemberName::set_type(mname(), type());
796 }
797 return;
798 }
799 case IS_FIELD:
800 {
801 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
802 if (!((Klass*) vmtarget)->oop_is_instance()) break;
803 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
804 DEBUG_ONLY(vmtarget = NULL); // safety
805 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
806 fieldDescriptor fd; // find_field initializes fd if found
807 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
808 break; // cannot expand
809 if (!have_defc) {
810 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
811 }
812 if (!have_name) {
813 //not java_lang_String::create_from_symbol; let's intern member names
814 Handle name = StringTable::intern(fd.name(), CHECK);
815 java_lang_invoke_MemberName::set_name(mname(), name());
816 }
817 if (!have_type) {
818 // If it is a primitive field type, don't mess with short strings like "I".
819 Handle type = field_signature_type_or_null(fd.signature());
820 if (type.is_null()) {
821 java_lang_String::create_from_symbol(fd.signature(), CHECK);
822 }
823 java_lang_invoke_MemberName::set_type(mname(), type());
824 }
825 return;
826 }
827 }
828 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
829 }
830
831 int MethodHandles::find_MemberNames(KlassHandle k,
832 Symbol* name, Symbol* sig,
833 int mflags, KlassHandle caller,
834 int skip, objArrayHandle results) {
835 // %%% take caller into account!
836
837 Thread* thread = Thread::current();
838
839 if (k.is_null() || !k->oop_is_instance()) return -1;
840
841 int rfill = 0, rlimit = results->length(), rskip = skip;
842 // overflow measurement:
843 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
844
845 int match_flags = mflags;
846 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
847 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
848 bool local_only = !(search_superc | search_intfc);
849 bool classes_only = false;
850
851 if (name != NULL) {
852 if (name->utf8_length() == 0) return 0; // a match is not possible
853 }
854 if (sig != NULL) {
855 if (sig->utf8_length() == 0) return 0; // a match is not possible
856 if (sig->byte_at(0) == '(')
857 match_flags &= ~(IS_FIELD | IS_TYPE);
858 else
859 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
860 }
861
862 if ((match_flags & IS_TYPE) != 0) {
863 // NYI, and Core Reflection works quite well for this query
864 }
865
866 if ((match_flags & IS_FIELD) != 0) {
867 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
868 if (name != NULL && st.name() != name)
869 continue;
870 if (sig != NULL && st.signature() != sig)
871 continue;
872 // passed the filters
873 if (rskip > 0) {
874 --rskip;
875 } else if (rfill < rlimit) {
876 Handle result(thread, results->obj_at(rfill++));
877 if (!java_lang_invoke_MemberName::is_instance(result()))
878 return -99; // caller bug!
879 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
880 if (saved != result())
881 results->obj_at_put(rfill-1, saved); // show saved instance to user
882 } else if (++overflow >= overflow_limit) {
883 match_flags = 0; break; // got tired of looking at overflow
884 }
885 }
886 }
887
888 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
889 // watch out for these guys:
890 Symbol* init_name = vmSymbols::object_initializer_name();
891 Symbol* clinit_name = vmSymbols::class_initializer_name();
892 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
893 bool negate_name_test = false;
894 // fix name so that it captures the intention of IS_CONSTRUCTOR
895 if (!(match_flags & IS_METHOD)) {
896 // constructors only
897 if (name == NULL) {
898 name = init_name;
899 } else if (name != init_name) {
900 return 0; // no constructors of this method name
901 }
902 } else if (!(match_flags & IS_CONSTRUCTOR)) {
903 // methods only
904 if (name == NULL) {
905 name = init_name;
906 negate_name_test = true; // if we see the name, we *omit* the entry
907 } else if (name == init_name) {
908 return 0; // no methods of this constructor name
909 }
910 } else {
911 // caller will accept either sort; no need to adjust name
912 }
913 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
914 Method* m = st.method();
915 Symbol* m_name = m->name();
916 if (m_name == clinit_name)
917 continue;
918 if (name != NULL && ((m_name != name) ^ negate_name_test))
919 continue;
920 if (sig != NULL && m->signature() != sig)
921 continue;
922 // passed the filters
923 if (rskip > 0) {
924 --rskip;
925 } else if (rfill < rlimit) {
926 Handle result(thread, results->obj_at(rfill++));
927 if (!java_lang_invoke_MemberName::is_instance(result()))
928 return -99; // caller bug!
929 CallInfo info(m);
930 oop saved = MethodHandles::init_method_MemberName(result, info);
931 if (saved != result())
932 results->obj_at_put(rfill-1, saved); // show saved instance to user
933 } else if (++overflow >= overflow_limit) {
934 match_flags = 0; break; // got tired of looking at overflow
935 }
936 }
937 }
938
939 // return number of elements we at leasted wanted to initialize
940 return rfill + overflow;
941 }
942
943 // Get context class for a CallSite instance: either extract existing context or use default one.
944 InstanceKlass* MethodHandles::get_call_site_context(oop call_site) {
945 // In order to extract a context the following traversal is performed:
946 // CallSite.context => Cleaner.referent => Class._klass => Klass
947 assert(java_lang_invoke_CallSite::is_instance(call_site), "");
948 oop context_oop = java_lang_invoke_CallSite::context_volatile(call_site);
949 if (oopDesc::is_null(context_oop)) {
950 return NULL; // The context hasn't been initialized yet.
951 }
952 oop context_class_oop = java_lang_ref_Reference::referent(context_oop);
953 if (oopDesc::is_null(context_class_oop)) {
954 // The context reference was cleared by GC, so current dependency context
955 // isn't usable anymore. Context should be fetched from CallSite again.
956 return NULL;
957 }
958 return InstanceKlass::cast(java_lang_Class::as_Klass(context_class_oop));
959 }
960
961 //------------------------------------------------------------------------------
962 // MemberNameTable
963 //
964
965 MemberNameTable::MemberNameTable(int methods_cnt)
966 : GrowableArray<jweak>(methods_cnt, true) {
967 assert_locked_or_safepoint(MemberNameTable_lock);
968 }
969
970 MemberNameTable::~MemberNameTable() {
971 assert_locked_or_safepoint(MemberNameTable_lock);
972 int len = this->length();
973
974 for (int idx = 0; idx < len; idx++) {
975 jweak ref = this->at(idx);
976 JNIHandles::destroy_weak_global(ref);
977 }
978 }
979
980 void MemberNameTable::add_member_name(jweak mem_name_wref) {
981 assert_locked_or_safepoint(MemberNameTable_lock);
982 this->push(mem_name_wref);
983 }
984
985 #if INCLUDE_JVMTI
986 // It is called at safepoint only for RedefineClasses
987 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) {
988 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
989 // For each redefined method
990 for (int idx = 0; idx < length(); idx++) {
991 oop mem_name = JNIHandles::resolve(this->at(idx));
992 if (mem_name == NULL) {
993 continue;
994 }
995 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
996
997 if (old_method == NULL || !old_method->is_old()) {
998 continue; // skip uninteresting entries
999 }
1000 if (old_method->is_deleted()) {
1001 // skip entries with deleted methods
1002 continue;
1003 }
1004 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum());
1005
1006 assert(new_method != NULL, "method_with_idnum() should not be NULL");
1007 assert(old_method != new_method, "sanity check");
1008
1009 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method);
1010
1011 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1012 if (!(*trace_name_printed)) {
1013 // RC_TRACE_MESG macro has an embedded ResourceMark
1014 RC_TRACE_MESG(("adjust: name=%s",
1015 old_method->method_holder()->external_name()));
1016 *trace_name_printed = true;
1017 }
1018 // RC_TRACE macro has an embedded ResourceMark
1019 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
1020 new_method->name()->as_C_string(),
1021 new_method->signature()->as_C_string()));
1022 }
1023 }
1024 }
1025 #endif // INCLUDE_JVMTI
1026
1027 //
1028 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1029 // They are the private interface between this JVM and the HotSpot-specific
1030 // Java code that implements JSR 292 method handles.
1031 //
1032 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1033 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1034 //
1035
1036 #ifndef PRODUCT
1037 #define EACH_NAMED_CON(template, requirement) \
1038 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1039 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1040 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1041 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1042 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1043 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1044 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1045 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1046 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
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_non_null(target_jh));
1274 {
1275 // Walk all nmethods depending on this call site.
1276 MutexLocker mu(Compile_lock, thread);
1277 CodeCache::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_non_null(target_jh));
1286 {
1287 // Walk all nmethods depending on this call site.
1288 MutexLocker mu(Compile_lock, thread);
1289 CodeCache::flush_dependents_on(call_site, target);
1290 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1291 }
1292 }
1293 JVM_END
1294
1295 JVM_ENTRY(void, MHN_invalidateDependentNMethods(JNIEnv* env, jobject igcls, jobject call_site_jh)) {
1296 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1297 {
1298 // Walk all nmethods depending on this call site.
1299 MutexLocker mu1(Compile_lock, thread);
1300
1301 CallSiteDepChange changes(call_site(), Handle());
1302
1303 InstanceKlass* ctxk = MethodHandles::get_call_site_context(call_site());
1304 if (ctxk == NULL) {
1305 return; // No dependencies to invalidate yet.
1306 }
1307 int marked = 0;
1308 {
1309 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1310 marked = ctxk->mark_dependent_nmethods(changes);
1311 }
1312 java_lang_invoke_CallSite::set_context_volatile(call_site(), NULL); // Reset call site to initial state
1313 if (marked > 0) {
1314 // At least one nmethod has been marked for deoptimization
1315 VM_Deoptimize op;
1316 VMThread::execute(&op);
1317 }
1318 }
1319 }
1320 JVM_END
1321
1322 /**
1323 * Throws a java/lang/UnsupportedOperationException unconditionally.
1324 * This is required by the specification of MethodHandle.invoke if
1325 * invoked directly.
1326 */
1327 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1328 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1329 return NULL;
1330 }
1331 JVM_END
1332
1333 /**
1334 * Throws a java/lang/UnsupportedOperationException unconditionally.
1335 * This is required by the specification of MethodHandle.invokeExact if
1336 * invoked directly.
1337 */
1338 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1339 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1340 return NULL;
1341 }
1342 JVM_END
1343
1344 /// JVM_RegisterMethodHandleMethods
1345
1346 #undef CS // Solaris builds complain
1347
1348 #define LANG "Ljava/lang/"
1349 #define JLINV "Ljava/lang/invoke/"
1350
1351 #define OBJ LANG"Object;"
1352 #define CLS LANG"Class;"
1353 #define STRG LANG"String;"
1354 #define CS JLINV"CallSite;"
1355 #define MT JLINV"MethodType;"
1356 #define MH JLINV"MethodHandle;"
1357 #define MEM JLINV"MemberName;"
1358
1359 #define CC (char*) /*cast a literal from (const char*)*/
1360 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1361
1362 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1363 static JNINativeMethod MHN_methods[] = {
1364 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1365 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1366 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1367 // static native int getNamedCon(int which, Object[] name)
1368 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1369 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1370 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1371 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1372 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1373 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1374 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1375 {CC"invalidateDependentNMethods", CC"("CS")V", FN_PTR(MHN_invalidateDependentNMethods)},
1376 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1377 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1378 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1379 };
1380
1381 static JNINativeMethod MH_methods[] = {
1382 // UnsupportedOperationException throwers
1383 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1384 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1385 };
1386
1387 /**
1388 * Helper method to register native methods.
1389 */
1390 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1391 int status = env->RegisterNatives(clazz, methods, nMethods);
1392 if (status != JNI_OK || env->ExceptionOccurred()) {
1393 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1394 env->ExceptionClear();
1395 return false;
1396 }
1397 return true;
1398 }
1399
1400 /**
1401 * This one function is exported, used by NativeLookup.
1402 */
1403 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1404 assert(!MethodHandles::enabled(), "must not be enabled");
1405 bool enable_MH = true;
1406
1407 jclass MH_class = NULL;
1408 if (SystemDictionary::MethodHandle_klass() == NULL) {
1409 enable_MH = false;
1410 } else {
1411 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1412 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1413 }
1414
1415 if (enable_MH) {
1416 ThreadToNativeFromVM ttnfv(thread);
1417
1418 if (enable_MH) {
1419 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1420 }
1421 if (enable_MH) {
1422 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1423 }
1424 }
1425
1426 if (TraceInvokeDynamic) {
1427 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1428 }
1429
1430 if (enable_MH) {
1431 if (MethodHandles::generate_adapters() == false) {
1432 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters");
1433 }
1434 MethodHandles::set_enabled(true);
1435 }
1436 }
1437 JVM_END