1 /*
2 * Copyright (c) 2008, 2016, 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 "code/codeCacheExtensions.hpp"
30 #include "code/dependencyContext.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "interpreter/oopMapCache.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "oops/objArrayOop.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/methodHandles.hpp"
40 #include "prims/jvmtiRedefineClassesTrace.hpp"
41 #include "runtime/compilationPolicy.hpp"
42 #include "runtime/javaCalls.hpp"
43 #include "runtime/logTimer.hpp"
44 #include "runtime/reflection.hpp"
45 #include "runtime/signature.hpp"
46 #include "runtime/stubRoutines.hpp"
47 #include "utilities/exceptions.hpp"
48
49
50 /*
51 * JSR 292 reference implementation: method handles
52 * The JDK 7 reference implementation represented method handle
53 * combinations as chains. Each link in the chain had a "vmentry"
54 * field which pointed at a bit of assembly code which performed
55 * one transformation before dispatching to the next link in the chain.
56 *
57 * The current reference implementation pushes almost all code generation
58 * responsibility to (trusted) Java code. A method handle contains a
59 * pointer to its "LambdaForm", which embodies all details of the method
60 * handle's behavior. The LambdaForm is a normal Java object, managed
61 * by a runtime coded in Java.
62 */
63
64 bool MethodHandles::_enabled = false; // set true after successful native linkage
65 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
66
67
68 /**
69 * Generates method handle adapters. Returns 'false' if memory allocation
70 * failed and true otherwise.
71 */
72 bool MethodHandles::generate_adapters() {
73 if (SystemDictionary::MethodHandle_klass() == NULL) {
74 return true;
75 }
76
77 assert(_adapter_code == NULL, "generate only once");
78
79 ResourceMark rm;
80 TraceStartupTime timer("MethodHandles adapters generation");
81 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
82 if (_adapter_code == NULL) {
83 return false;
84 }
85
86 CodeBuffer code(_adapter_code);
87 MethodHandlesAdapterGenerator g(&code);
88 g.generate();
89 code.log_section_sizes("MethodHandlesAdapterBlob");
90 return true;
91 }
92
93 //------------------------------------------------------------------------------
94 // MethodHandlesAdapterGenerator::generate
95 //
96 void MethodHandlesAdapterGenerator::generate() {
97 // Generate generic method handle adapters.
98 // Generate interpreter entries
99 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
100 mk <= Interpreter::method_handle_invoke_LAST;
101 mk = Interpreter::MethodKind(1 + (int)mk)) {
102 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
103 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
104 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
105 if (entry != NULL) {
106 CodeCacheExtensions::handle_generated_pc(entry, vmIntrinsics::name_at(iid));
107 Interpreter::set_entry_for_kind(mk, entry);
108 }
109 // If the entry is not set, it will throw AbstractMethodError.
110 }
111 }
112
113 void MethodHandles::set_enabled(bool z) {
114 if (_enabled != z) {
115 guarantee(z, "can only enable once");
116 _enabled = z;
117 }
118 }
119
120 // MemberName support
121
122 // import java_lang_invoke_MemberName.*
123 enum {
124 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
125 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
126 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
127 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
128 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
129 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
130 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
131 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
132 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
133 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
134 };
135
136 Handle MethodHandles::new_MemberName(TRAPS) {
137 Handle empty;
138 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
139 if (!k->is_initialized()) k->initialize(CHECK_(empty));
140 return Handle(THREAD, k->allocate_instance(THREAD));
141 }
142
143 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
144 // This method is used from java.lang.invoke.MemberName constructors.
145 // It fills in the new MemberName from a java.lang.reflect.Member.
146 Thread* thread = Thread::current();
147 oop target_oop = target();
148 Klass* target_klass = target_oop->klass();
149 if (target_klass == SystemDictionary::reflect_Field_klass()) {
150 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
151 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
152 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
153 if (!k.is_null() && k->is_instance_klass()) {
154 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
155 oop mname2 = init_field_MemberName(mname, fd);
156 if (mname2 != NULL) {
157 // Since we have the reified name and type handy, add them to the result.
158 if (java_lang_invoke_MemberName::name(mname2) == NULL)
159 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
160 if (java_lang_invoke_MemberName::type(mname2) == NULL)
161 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
162 }
163 return mname2;
164 }
165 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
166 oop clazz = java_lang_reflect_Method::clazz(target_oop);
167 int slot = java_lang_reflect_Method::slot(target_oop);
168 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
169 if (!k.is_null() && k->is_instance_klass()) {
170 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
171 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
172 return NULL; // do not resolve unless there is a concrete signature
173 CallInfo info(m, k());
174 return init_method_MemberName(mname, info);
175 }
176 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
177 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
178 int slot = java_lang_reflect_Constructor::slot(target_oop);
179 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
180 if (!k.is_null() && k->is_instance_klass()) {
181 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
182 if (m == NULL) return NULL;
183 CallInfo info(m, k());
184 return init_method_MemberName(mname, info);
185 }
186 }
187 return NULL;
188 }
189
190 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
191 assert(info.resolved_appendix().is_null(), "only normal methods here");
192 methodHandle m = info.resolved_method();
193 assert(m.not_null(), "null method handle");
194 KlassHandle m_klass = m->method_holder();
195 assert(m.not_null(), "null holder for method handle");
196 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
197 int vmindex = Method::invalid_vtable_index;
198
199 switch (info.call_kind()) {
200 case CallInfo::itable_call:
201 vmindex = info.itable_index();
202 // More importantly, the itable index only works with the method holder.
203 assert(m_klass->verify_itable_index(vmindex), "");
204 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
205 if (TraceInvokeDynamic) {
206 ttyLocker ttyl;
207 ResourceMark rm;
208 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
209 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
210 vmindex);
211 m->access_flags().print_on(tty);
212 if (!m->is_abstract()) {
213 tty->print("default");
214 }
215 tty->cr();
216 }
217 break;
218
219 case CallInfo::vtable_call:
220 vmindex = info.vtable_index();
221 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
222 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
223 if (m_klass->is_interface()) {
224 // This is a vtable call to an interface method (abstract "miranda method" or default method).
225 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
226 // (LinkResolver should help us figure this out.)
227 KlassHandle m_klass_non_interface = info.resolved_klass();
228 if (m_klass_non_interface->is_interface()) {
229 m_klass_non_interface = SystemDictionary::Object_klass();
230 #ifdef ASSERT
231 { ResourceMark rm;
232 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
233 assert(m->name() == m2->name() && m->signature() == m2->signature(),
234 "at %d, %s != %s", vmindex,
235 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
236 }
237 #endif //ASSERT
238 }
239 if (!m->is_public()) {
240 assert(m->is_public(), "virtual call must be to public interface method");
241 return NULL; // elicit an error later in product build
242 }
243 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
244 m_klass = m_klass_non_interface;
245 }
246 if (TraceInvokeDynamic) {
247 ttyLocker ttyl;
248 ResourceMark rm;
249 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
250 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
251 m_klass->internal_name(), vmindex);
252 m->access_flags().print_on(tty);
253 if (m->is_default_method()) {
254 tty->print("default");
255 }
256 tty->cr();
257 }
258 break;
259
260 case CallInfo::direct_call:
261 vmindex = Method::nonvirtual_vtable_index;
262 if (m->is_static()) {
263 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
264 } else if (m->is_initializer()) {
265 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
266 } else {
267 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
268 }
269 break;
270
271 default: assert(false, "bad CallInfo"); return NULL;
272 }
273
274 // @CallerSensitive annotation detected
275 if (m->caller_sensitive()) {
276 flags |= CALLER_SENSITIVE;
277 }
278
279 oop mname_oop = mname();
280 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
281 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
282 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
283 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
284 // Note: name and type can be lazily computed by resolve_MemberName,
285 // if Java code needs them as resolved String and MethodType objects.
286 // The clazz must be eagerly stored, because it provides a GC
287 // root to help keep alive the Method*.
288 // If relevant, the vtable or itable value is stored as vmindex.
289 // This is done eagerly, since it is readily available without
290 // constructing any new objects.
291 // TO DO: maybe intern mname_oop
292 if (m->method_holder()->add_member_name(mname)) {
293 return mname();
294 } else {
295 // Redefinition caused this to fail. Return NULL (and an exception?)
296 return NULL;
297 }
298 }
299
300 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
301 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
302 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
303 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
304 Metadata* vmtarget = fd.field_holder();
305 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
306 oop mname_oop = mname();
307 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
308 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
309 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
310 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
311 oop type = field_signature_type_or_null(fd.signature());
312 oop name = field_name_or_null(fd.name());
313 if (name != NULL)
314 java_lang_invoke_MemberName::set_name(mname_oop, name);
315 if (type != NULL)
316 java_lang_invoke_MemberName::set_type(mname_oop, type);
317 // Note: name and type can be lazily computed by resolve_MemberName,
318 // if Java code needs them as resolved String and Class objects.
319 // Note that the incoming type oop might be pre-resolved (non-null).
320 // The base clazz and field offset (vmindex) must be eagerly stored,
321 // because they unambiguously identify the field.
322 // Although the fieldDescriptor::_index would also identify the field,
323 // we do not use it, because it is harder to decode.
324 // TO DO: maybe intern mname_oop
325 return mname();
326 }
327
328 // JVM 2.9 Special Methods:
329 // A method is signature polymorphic if and only if all of the following conditions hold :
330 // * It is declared in the java.lang.invoke.MethodHandle class.
331 // * It has a single formal parameter of type Object[].
332 // * It has a return type of Object.
333 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
334 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
335 if (klass == NULL)
336 return false;
337 // The following test will fail spuriously during bootstrap of MethodHandle itself:
338 // if (klass != SystemDictionary::MethodHandle_klass())
339 // Test the name instead:
340 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
341 return false;
342 Symbol* poly_sig = vmSymbols::object_array_object_signature();
343 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
344 if (m == NULL) return false;
345 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
346 int flags = m->access_flags().as_int();
347 return (flags & required) == required;
348 }
349
350
351 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
352 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
353 switch (iid) {
354 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
355 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
356 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
357 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
358 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
359 }
360 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
361 return 0;
362 }
363
364 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
365 switch(id) {
366 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
367 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
368 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
369 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
370 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
371 default:
372 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
373 return Bytecodes::_illegal;
374 }
375 }
376
377 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
378 switch (iid) {
379 case vmIntrinsics::_invokeBasic: return 0;
380 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
381 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
382 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
383 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
384 }
385 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
386 return 0;
387 }
388
389 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
390 vmSymbols::SID name_id = vmSymbols::find_sid(name);
391 switch (name_id) {
392 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
393 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
394 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
395 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
396
397 // There is one static signature-polymorphic method for each JVM invocation mode.
398 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
399 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
400 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
401 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
402 }
403
404 // Cover the case of invokeExact and any future variants of invokeFoo.
405 Klass* mh_klass = SystemDictionary::well_known_klass(
406 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
407 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
408 return vmIntrinsics::_invokeGeneric;
409
410 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
411 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
412 return vmIntrinsics::_none;
413 }
414
415 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
416 if (klass != NULL &&
417 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
418 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
419 if (iid != vmIntrinsics::_none)
420 return iid;
421 if (is_method_handle_invoke_name(klass, name))
422 return vmIntrinsics::_invokeGeneric;
423 }
424 return vmIntrinsics::_none;
425 }
426
427
428 // convert the external string or reflective type to an internal signature
429 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
430 if (java_lang_invoke_MethodType::is_instance(type_str)) {
431 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
432 } else if (java_lang_Class::is_instance(type_str)) {
433 return java_lang_Class::as_signature(type_str, false, THREAD);
434 } else if (java_lang_String::is_instance_inlined(type_str)) {
435 if (intern_if_not_found) {
436 return java_lang_String::as_symbol(type_str, THREAD);
437 } else {
438 return java_lang_String::as_symbol_or_null(type_str);
439 }
440 } else {
441 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
442 }
443 }
444
445 static const char OBJ_SIG[] = "Ljava/lang/Object;";
446 enum { OBJ_SIG_LEN = 18 };
447
448 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
449 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
450 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
451 const int len = sig->utf8_length();
452 for (int i = 0; i < len; i++) {
453 switch (sig->byte_at(i)) {
454 case 'L':
455 // only java/lang/Object is valid here
456 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
457 return false;
458 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
459 continue;
460 case '(': case ')': case 'V':
461 case 'I': case 'J': case 'F': case 'D':
462 continue;
463 //case '[':
464 //case 'Z': case 'B': case 'C': case 'S':
465 default:
466 return false;
467 }
468 }
469 return true;
470 }
471
472 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
473 Symbol* bsig = NULL;
474 if (sig == NULL) {
475 return sig;
476 } else if (is_basic_type_signature(sig)) {
477 sig->increment_refcount();
478 return sig; // that was easy
479 } else if (sig->byte_at(0) != '(') {
480 BasicType bt = char2type(sig->byte_at(0));
481 if (is_subword_type(bt)) {
482 bsig = vmSymbols::int_signature();
483 } else {
484 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
485 bsig = vmSymbols::object_signature();
486 }
487 } else {
488 ResourceMark rm;
489 stringStream buffer(128);
490 buffer.put('(');
491 int arg_pos = 0, keep_arg_pos = -1;
492 if (keep_last_arg)
493 keep_arg_pos = ArgumentCount(sig).size() - 1;
494 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
495 BasicType bt = ss.type();
496 size_t this_arg_pos = buffer.size();
497 if (ss.at_return_type()) {
498 buffer.put(')');
499 }
500 if (arg_pos == keep_arg_pos) {
501 buffer.write((char*) ss.raw_bytes(),
502 (int) ss.raw_length());
503 } else if (bt == T_OBJECT || bt == T_ARRAY) {
504 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
505 } else {
506 if (is_subword_type(bt))
507 bt = T_INT;
508 buffer.put(type2char(bt));
509 }
510 arg_pos++;
511 }
512 const char* sigstr = buffer.base();
513 int siglen = (int) buffer.size();
514 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
515 }
516 assert(is_basic_type_signature(bsig) ||
517 // detune assert in case the injected argument is not a basic type:
518 keep_last_arg, "");
519 return bsig;
520 }
521
522 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
523 Symbol* sig,
524 bool keep_arrays,
525 bool keep_basic_names) {
526 st = st ? st : tty;
527 int len = sig->utf8_length();
528 int array = 0;
529 bool prev_type = false;
530 for (int i = 0; i < len; i++) {
531 char ch = sig->byte_at(i);
532 switch (ch) {
533 case '(': case ')':
534 prev_type = false;
535 st->put(ch);
536 continue;
537 case '[':
538 if (!keep_basic_names && keep_arrays)
539 st->put(ch);
540 array++;
541 continue;
542 case 'L':
543 {
544 if (prev_type) st->put(',');
545 int start = i+1, slash = start;
546 while (++i < len && (ch = sig->byte_at(i)) != ';') {
547 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
548 }
549 if (slash < i) start = slash;
550 if (!keep_basic_names) {
551 st->put('L');
552 } else {
553 for (int j = start; j < i; j++)
554 st->put(sig->byte_at(j));
555 prev_type = true;
556 }
557 break;
558 }
559 default:
560 {
561 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
562 ch = '[';
563 array = 0;
564 }
565 if (prev_type) st->put(',');
566 const char* n = NULL;
567 if (keep_basic_names)
568 n = type2name(char2type(ch));
569 if (n == NULL) {
570 // unknown letter, or we don't want to know its name
571 st->put(ch);
572 } else {
573 st->print("%s", n);
574 prev_type = true;
575 }
576 break;
577 }
578 }
579 // Switch break goes here to take care of array suffix:
580 if (prev_type) {
581 while (array > 0) {
582 st->print("[]");
583 --array;
584 }
585 }
586 array = 0;
587 }
588 }
589
590
591
592 static oop object_java_mirror() {
593 return SystemDictionary::Object_klass()->java_mirror();
594 }
595
596 oop MethodHandles::field_name_or_null(Symbol* s) {
597 if (s == NULL) return NULL;
598 return StringTable::lookup(s);
599 }
600
601 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
602 if (s == NULL) return NULL;
603 BasicType bt = FieldType::basic_type(s);
604 if (is_java_primitive(bt)) {
605 assert(s->utf8_length() == 1, "");
606 return java_lang_Class::primitive_mirror(bt);
607 }
608 // Here are some more short cuts for common types.
609 // They are optional, since reference types can be resolved lazily.
610 if (bt == T_OBJECT) {
611 if (s == vmSymbols::object_signature()) {
612 return object_java_mirror();
613 } else if (s == vmSymbols::class_signature()) {
614 return SystemDictionary::Class_klass()->java_mirror();
615 } else if (s == vmSymbols::string_signature()) {
616 return SystemDictionary::String_klass()->java_mirror();
617 }
618 }
619 return NULL;
620 }
621
622
623 // An unresolved member name is a mere symbolic reference.
624 // Resolving it plants a vmtarget/vmindex in it,
625 // which refers directly to JVM internals.
626 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
627 Handle empty;
628 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
629
630 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
631 // Already resolved.
632 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
633 assert(vmindex >= Method::nonvirtual_vtable_index, "");
634 return mname;
635 }
636
637 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
638 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
639 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
640 int flags = java_lang_invoke_MemberName::flags(mname());
641 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
642 if (!ref_kind_is_valid(ref_kind)) {
643 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
644 }
645
646 DEBUG_ONLY(int old_vmindex);
647 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
648
649 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
650 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
651 }
652
653 instanceKlassHandle defc;
654 {
655 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
656 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
657 if (!defc_klass->is_instance_klass()) {
658 if (!defc_klass->is_array_klass()) return empty;
659 defc_klass = SystemDictionary::Object_klass();
660 }
661 defc = instanceKlassHandle(THREAD, defc_klass);
662 }
663 if (defc.is_null()) {
664 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
665 }
666 defc->link_class(CHECK_(empty)); // possible safepoint
667
668 // convert the external string name to an internal symbol
669 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
670 if (name == NULL) return empty; // no such name
671 if (name == vmSymbols::class_initializer_name())
672 return empty; // illegal name
673
674 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
675 if ((flags & ALL_KINDS) == IS_METHOD &&
676 (defc() == SystemDictionary::MethodHandle_klass()) &&
677 (ref_kind == JVM_REF_invokeVirtual ||
678 ref_kind == JVM_REF_invokeSpecial ||
679 // static invocation mode is required for _linkToVirtual, etc.:
680 ref_kind == JVM_REF_invokeStatic)) {
681 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
682 if (iid != vmIntrinsics::_none &&
683 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
684 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
685 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
686 mh_invoke_id = iid;
687 }
688 }
689
690 // convert the external string or reflective type to an internal signature
691 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
692 if (type == NULL) return empty; // no such signature exists in the VM
693
694 // Time to do the lookup.
695 switch (flags & ALL_KINDS) {
696 case IS_METHOD:
697 {
698 CallInfo result;
699 LinkInfo link_info(defc, name, type, caller, caller.not_null());
700 {
701 assert(!HAS_PENDING_EXCEPTION, "");
702 if (ref_kind == JVM_REF_invokeStatic) {
703 LinkResolver::resolve_static_call(result,
704 link_info, false, THREAD);
705 } else if (ref_kind == JVM_REF_invokeInterface) {
706 LinkResolver::resolve_interface_call(result, Handle(), defc,
707 link_info, false, THREAD);
708 } else if (mh_invoke_id != vmIntrinsics::_none) {
709 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
710 LinkResolver::resolve_handle_call(result, link_info, THREAD);
711 } else if (ref_kind == JVM_REF_invokeSpecial) {
712 LinkResolver::resolve_special_call(result,
713 link_info, THREAD);
714 } else if (ref_kind == JVM_REF_invokeVirtual) {
715 LinkResolver::resolve_virtual_call(result, Handle(), defc,
716 link_info, false, THREAD);
717 } else {
718 assert(false, "ref_kind=%d", ref_kind);
719 }
720 if (HAS_PENDING_EXCEPTION) {
721 return empty;
722 }
723 }
724 if (result.resolved_appendix().not_null()) {
725 // The resolved MemberName must not be accompanied by an appendix argument,
726 // since there is no way to bind this value into the MemberName.
727 // Caller is responsible to prevent this from happening.
728 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
729 }
730 oop mname2 = init_method_MemberName(mname, result);
731 return Handle(THREAD, mname2);
732 }
733 case IS_CONSTRUCTOR:
734 {
735 CallInfo result;
736 LinkInfo link_info(defc, name, type, caller, caller.not_null());
737 {
738 assert(!HAS_PENDING_EXCEPTION, "");
739 if (name == vmSymbols::object_initializer_name()) {
740 LinkResolver::resolve_special_call(result, link_info, THREAD);
741 } else {
742 break; // will throw after end of switch
743 }
744 if (HAS_PENDING_EXCEPTION) {
745 return empty;
746 }
747 }
748 assert(result.is_statically_bound(), "");
749 oop mname2 = init_method_MemberName(mname, result);
750 return Handle(THREAD, mname2);
751 }
752 case IS_FIELD:
753 {
754 fieldDescriptor result; // find_field initializes fd if found
755 {
756 assert(!HAS_PENDING_EXCEPTION, "");
757 LinkInfo link_info(defc, name, type, caller, /*check_access*/false);
758 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
759 if (HAS_PENDING_EXCEPTION) {
760 return empty;
761 }
762 }
763 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
764 return Handle(THREAD, mname2);
765 }
766 default:
767 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
768 }
769
770 return empty;
771 }
772
773 // Conversely, a member name which is only initialized from JVM internals
774 // may have null defc, name, and type fields.
775 // Resolving it plants a vmtarget/vmindex in it,
776 // which refers directly to JVM internals.
777 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
778 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
779 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
780 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
781 if (vmtarget == NULL) {
782 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
783 }
784
785 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
786 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
787 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
788 int flags = java_lang_invoke_MemberName::flags(mname());
789
790 if (suppress != 0) {
791 if (suppress & _suppress_defc) have_defc = true;
792 if (suppress & _suppress_name) have_name = true;
793 if (suppress & _suppress_type) have_type = true;
794 }
795
796 if (have_defc && have_name && have_type) return; // nothing needed
797
798 switch (flags & ALL_KINDS) {
799 case IS_METHOD:
800 case IS_CONSTRUCTOR:
801 {
802 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
803 methodHandle m(THREAD, (Method*)vmtarget);
804 DEBUG_ONLY(vmtarget = NULL); // safety
805 if (m.is_null()) break;
806 if (!have_defc) {
807 InstanceKlass* defc = m->method_holder();
808 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
809 }
810 if (!have_name) {
811 //not java_lang_String::create_from_symbol; let's intern member names
812 Handle name = StringTable::intern(m->name(), CHECK);
813 java_lang_invoke_MemberName::set_name(mname(), name());
814 }
815 if (!have_type) {
816 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
817 java_lang_invoke_MemberName::set_type(mname(), type());
818 }
819 return;
820 }
821 case IS_FIELD:
822 {
823 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
824 if (!((Klass*) vmtarget)->is_instance_klass()) break;
825 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
826 DEBUG_ONLY(vmtarget = NULL); // safety
827 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
828 fieldDescriptor fd; // find_field initializes fd if found
829 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
830 break; // cannot expand
831 if (!have_defc) {
832 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
833 }
834 if (!have_name) {
835 //not java_lang_String::create_from_symbol; let's intern member names
836 Handle name = StringTable::intern(fd.name(), CHECK);
837 java_lang_invoke_MemberName::set_name(mname(), name());
838 }
839 if (!have_type) {
840 // If it is a primitive field type, don't mess with short strings like "I".
841 Handle type = field_signature_type_or_null(fd.signature());
842 if (type.is_null()) {
843 java_lang_String::create_from_symbol(fd.signature(), CHECK);
844 }
845 java_lang_invoke_MemberName::set_type(mname(), type());
846 }
847 return;
848 }
849 }
850 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
851 }
852
853 int MethodHandles::find_MemberNames(KlassHandle k,
854 Symbol* name, Symbol* sig,
855 int mflags, KlassHandle caller,
856 int skip, objArrayHandle results) {
857 // %%% take caller into account!
858
859 Thread* thread = Thread::current();
860
861 if (k.is_null() || !k->is_instance_klass()) return -1;
862
863 int rfill = 0, rlimit = results->length(), rskip = skip;
864 // overflow measurement:
865 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
866
867 int match_flags = mflags;
868 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
869 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
870 bool local_only = !(search_superc | search_intfc);
871 bool classes_only = false;
872
873 if (name != NULL) {
874 if (name->utf8_length() == 0) return 0; // a match is not possible
875 }
876 if (sig != NULL) {
877 if (sig->utf8_length() == 0) return 0; // a match is not possible
878 if (sig->byte_at(0) == '(')
879 match_flags &= ~(IS_FIELD | IS_TYPE);
880 else
881 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
882 }
883
884 if ((match_flags & IS_TYPE) != 0) {
885 // NYI, and Core Reflection works quite well for this query
886 }
887
888 if ((match_flags & IS_FIELD) != 0) {
889 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
890 if (name != NULL && st.name() != name)
891 continue;
892 if (sig != NULL && st.signature() != sig)
893 continue;
894 // passed the filters
895 if (rskip > 0) {
896 --rskip;
897 } else if (rfill < rlimit) {
898 Handle result(thread, results->obj_at(rfill++));
899 if (!java_lang_invoke_MemberName::is_instance(result()))
900 return -99; // caller bug!
901 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
902 if (saved != result())
903 results->obj_at_put(rfill-1, saved); // show saved instance to user
904 } else if (++overflow >= overflow_limit) {
905 match_flags = 0; break; // got tired of looking at overflow
906 }
907 }
908 }
909
910 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
911 // watch out for these guys:
912 Symbol* init_name = vmSymbols::object_initializer_name();
913 Symbol* clinit_name = vmSymbols::class_initializer_name();
914 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
915 bool negate_name_test = false;
916 // fix name so that it captures the intention of IS_CONSTRUCTOR
917 if (!(match_flags & IS_METHOD)) {
918 // constructors only
919 if (name == NULL) {
920 name = init_name;
921 } else if (name != init_name) {
922 return 0; // no constructors of this method name
923 }
924 } else if (!(match_flags & IS_CONSTRUCTOR)) {
925 // methods only
926 if (name == NULL) {
927 name = init_name;
928 negate_name_test = true; // if we see the name, we *omit* the entry
929 } else if (name == init_name) {
930 return 0; // no methods of this constructor name
931 }
932 } else {
933 // caller will accept either sort; no need to adjust name
934 }
935 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
936 Method* m = st.method();
937 Symbol* m_name = m->name();
938 if (m_name == clinit_name)
939 continue;
940 if (name != NULL && ((m_name != name) ^ negate_name_test))
941 continue;
942 if (sig != NULL && m->signature() != sig)
943 continue;
944 // passed the filters
945 if (rskip > 0) {
946 --rskip;
947 } else if (rfill < rlimit) {
948 Handle result(thread, results->obj_at(rfill++));
949 if (!java_lang_invoke_MemberName::is_instance(result()))
950 return -99; // caller bug!
951 CallInfo info(m);
952 oop saved = MethodHandles::init_method_MemberName(result, info);
953 if (saved != result())
954 results->obj_at_put(rfill-1, saved); // show saved instance to user
955 } else if (++overflow >= overflow_limit) {
956 match_flags = 0; break; // got tired of looking at overflow
957 }
958 }
959 }
960
961 // return number of elements we at leasted wanted to initialize
962 return rfill + overflow;
963 }
964
965 // Is it safe to remove stale entries from a dependency list?
966 static bool safe_to_expunge() {
967 // Since parallel GC threads can concurrently iterate over a dependency
968 // list during safepoint, it is safe to remove entries only when
969 // CodeCache lock is held.
970 return CodeCache_lock->owned_by_self();
971 }
972
973 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
974 assert_locked_or_safepoint(CodeCache_lock);
975
976 oop context = java_lang_invoke_CallSite::context(call_site);
977 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
978 // Try to purge stale entries on updates.
979 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
980 // in order to avoid memory leak, stale entries are purged whenever a dependency list
981 // is changed (both on addition and removal). Though memory reclamation is delayed,
982 // it avoids indefinite memory usage growth.
983 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
984 }
985
986 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
987 assert_locked_or_safepoint(CodeCache_lock);
988
989 oop context = java_lang_invoke_CallSite::context(call_site);
990 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
991 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
992 }
993
994 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
995 assert_lock_strong(Compile_lock);
996
997 int marked = 0;
998 CallSiteDepChange changes(call_site(), target());
999 {
1000 NoSafepointVerifier nsv;
1001 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1002
1003 oop context = java_lang_invoke_CallSite::context(call_site());
1004 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1005 marked = deps.mark_dependent_nmethods(changes);
1006 }
1007 if (marked > 0) {
1008 // At least one nmethod has been marked for deoptimization.
1009 VM_Deoptimize op;
1010 VMThread::execute(&op);
1011 }
1012 }
1013
1014 //------------------------------------------------------------------------------
1015 // MemberNameTable
1016 //
1017
1018 MemberNameTable::MemberNameTable(int methods_cnt)
1019 : GrowableArray<jweak>(methods_cnt, true) {
1020 assert_locked_or_safepoint(MemberNameTable_lock);
1021 }
1022
1023 MemberNameTable::~MemberNameTable() {
1024 assert_locked_or_safepoint(MemberNameTable_lock);
1025 int len = this->length();
1026
1027 for (int idx = 0; idx < len; idx++) {
1028 jweak ref = this->at(idx);
1029 JNIHandles::destroy_weak_global(ref);
1030 }
1031 }
1032
1033 void MemberNameTable::add_member_name(jweak mem_name_wref) {
1034 assert_locked_or_safepoint(MemberNameTable_lock);
1035 this->push(mem_name_wref);
1036 }
1037
1038 #if INCLUDE_JVMTI
1039 // It is called at safepoint only for RedefineClasses
1040 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) {
1041 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
1042 // For each redefined method
1043 for (int idx = 0; idx < length(); idx++) {
1044 oop mem_name = JNIHandles::resolve(this->at(idx));
1045 if (mem_name == NULL) {
1046 continue;
1047 }
1048 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
1049
1050 if (old_method == NULL || !old_method->is_old()) {
1051 continue; // skip uninteresting entries
1052 }
1053 if (old_method->is_deleted()) {
1054 // skip entries with deleted methods
1055 continue;
1056 }
1057 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum());
1058
1059 assert(new_method != NULL, "method_with_idnum() should not be NULL");
1060 assert(old_method != new_method, "sanity check");
1061
1062 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method);
1063
1064 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1065 if (!(*trace_name_printed)) {
1066 // RC_TRACE_MESG macro has an embedded ResourceMark
1067 RC_TRACE_MESG(("adjust: name=%s",
1068 old_method->method_holder()->external_name()));
1069 *trace_name_printed = true;
1070 }
1071 // RC_TRACE macro has an embedded ResourceMark
1072 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
1073 new_method->name()->as_C_string(),
1074 new_method->signature()->as_C_string()));
1075 }
1076 }
1077 }
1078 #endif // INCLUDE_JVMTI
1079
1080 //
1081 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1082 // They are the private interface between this JVM and the HotSpot-specific
1083 // Java code that implements JSR 292 method handles.
1084 //
1085 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1086 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1087 //
1088
1089 #ifndef PRODUCT
1090 #define EACH_NAMED_CON(template, requirement) \
1091 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1092 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1093 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1094 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1095 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1096 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1097 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1098 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1099 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1100 /*end*/
1101
1102 #define IGNORE_REQ(req_expr) /* req_expr */
1103 #define ONE_PLUS(scope,value) 1+
1104 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1105 #define VALUE_COMMA(scope,value) scope::value,
1106 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1107 #define STRING_NULL(scope,value) #value "\0"
1108 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1109
1110 static bool advertise_con_value(int which) {
1111 if (which < 0) return false;
1112 bool ok = true;
1113 int count = 0;
1114 #define INC_COUNT(scope,value) \
1115 ++count;
1116 #define CHECK_REQ(req_expr) \
1117 if (which < count) return ok; \
1118 ok = (req_expr);
1119 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1120 #undef INC_COUNT
1121 #undef CHECK_REQ
1122 assert(count == con_value_count, "");
1123 if (which < count) return ok;
1124 return false;
1125 }
1126
1127 #undef ONE_PLUS
1128 #undef VALUE_COMMA
1129 #undef STRING_NULL
1130 #undef EACH_NAMED_CON
1131 #endif // PRODUCT
1132
1133 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1134 #ifndef PRODUCT
1135 if (advertise_con_value(which)) {
1136 assert(which >= 0 && which < con_value_count, "");
1137 int con = con_values[which];
1138 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1139 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1140 const char* str = &con_names[0];
1141 for (int i = 0; i < which; i++)
1142 str += strlen(str) + 1; // skip name and null
1143 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1144 box->obj_at_put(0, name);
1145 }
1146 return con;
1147 }
1148 #endif
1149 return 0;
1150 }
1151 JVM_END
1152
1153 // void init(MemberName self, AccessibleObject ref)
1154 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1155 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1156 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1157 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1158 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1159 MethodHandles::init_MemberName(mname, target);
1160 }
1161 JVM_END
1162
1163 // void expand(MemberName self)
1164 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1165 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1166 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1167 MethodHandles::expand_MemberName(mname, 0, CHECK);
1168 }
1169 JVM_END
1170
1171 // void resolve(MemberName self, Class<?> caller)
1172 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1173 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1174 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1175
1176 // The trusted Java code that calls this method should already have performed
1177 // access checks on behalf of the given caller. But, we can verify this.
1178 if (VerifyMethodHandles && caller_jh != NULL &&
1179 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1180 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1181 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1182 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1183 }
1184
1185 // Reflection::verify_class_access can only handle instance classes.
1186 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1187 // Emulate LinkResolver::check_klass_accessability.
1188 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1189 if (!Reflection::verify_class_access(caller,
1190 reference_klass,
1191 true)) {
1192 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1193 }
1194 }
1195 }
1196
1197 KlassHandle caller(THREAD,
1198 caller_jh == NULL ? (Klass*) NULL :
1199 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1200 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1201
1202 if (resolved.is_null()) {
1203 int flags = java_lang_invoke_MemberName::flags(mname());
1204 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1205 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1206 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1207 }
1208 if ((flags & ALL_KINDS) == IS_FIELD) {
1209 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1210 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1211 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1212 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1213 } else {
1214 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1215 }
1216 }
1217
1218 return JNIHandles::make_local(THREAD, resolved());
1219 }
1220 JVM_END
1221
1222 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1223 if (mname == NULL ||
1224 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1225 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1226 } else {
1227 int flags = java_lang_invoke_MemberName::flags(mname);
1228 if ((flags & IS_FIELD) != 0 &&
1229 (must_be_static
1230 ? (flags & JVM_ACC_STATIC) != 0
1231 : (flags & JVM_ACC_STATIC) == 0)) {
1232 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1233 return (jlong) vmindex;
1234 }
1235 }
1236 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1237 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1238 return 0;
1239 }
1240
1241 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1242 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1243 }
1244 JVM_END
1245
1246 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1247 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1248 }
1249 JVM_END
1250
1251 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1252 // use the other function to perform sanity checks:
1253 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1254 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1255 return JNIHandles::make_local(THREAD, clazz);
1256 }
1257 JVM_END
1258
1259 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1260 if (mname_jh == NULL) return NULL;
1261 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1262 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1263 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1264 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1265 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1266 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1267 result->obj_at_put(0, x);
1268 x = NULL;
1269 if (vmtarget == NULL) {
1270 x = NULL;
1271 } else if (vmtarget->is_klass()) {
1272 x = ((Klass*) vmtarget)->java_mirror();
1273 } else if (vmtarget->is_method()) {
1274 x = mname();
1275 }
1276 result->obj_at_put(1, x);
1277 return JNIHandles::make_local(env, result());
1278 }
1279 JVM_END
1280
1281
1282
1283 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1284 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1285 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1286 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1287 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1288 if (clazz_jh == NULL || results_jh == NULL) return -1;
1289 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1290
1291 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1292 if (results.is_null() || !results->is_objArray()) return -1;
1293
1294 TempNewSymbol name = NULL;
1295 TempNewSymbol sig = NULL;
1296 if (name_jh != NULL) {
1297 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1298 if (name == NULL) return 0; // a match is not possible
1299 }
1300 if (sig_jh != NULL) {
1301 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1302 if (sig == NULL) return 0; // a match is not possible
1303 }
1304
1305 KlassHandle caller;
1306 if (caller_jh != NULL) {
1307 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1308 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1309 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1310 }
1311
1312 if (name != NULL && sig != NULL && results.not_null()) {
1313 // try a direct resolve
1314 // %%% TO DO
1315 }
1316
1317 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1318 caller, skip, results);
1319 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1320 return res;
1321 }
1322 JVM_END
1323
1324 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1325 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1326 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1327 {
1328 // Walk all nmethods depending on this call site.
1329 MutexLocker mu(Compile_lock, thread);
1330 MethodHandles::flush_dependent_nmethods(call_site, target);
1331 java_lang_invoke_CallSite::set_target(call_site(), target());
1332 }
1333 }
1334 JVM_END
1335
1336 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1337 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1338 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1339 {
1340 // Walk all nmethods depending on this call site.
1341 MutexLocker mu(Compile_lock, thread);
1342 MethodHandles::flush_dependent_nmethods(call_site, target);
1343 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1344 }
1345 }
1346 JVM_END
1347
1348 // It is called by a Cleaner object which ensures that dropped CallSites properly
1349 // deallocate their dependency information.
1350 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1351 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1352 {
1353 // Walk all nmethods depending on this call site.
1354 MutexLocker mu1(Compile_lock, thread);
1355
1356 int marked = 0;
1357 {
1358 NoSafepointVerifier nsv;
1359 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1360 assert(safe_to_expunge(), "removal is not safe");
1361 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1362 marked = deps.remove_all_dependents();
1363 }
1364 if (marked > 0) {
1365 // At least one nmethod has been marked for deoptimization
1366 VM_Deoptimize op;
1367 VMThread::execute(&op);
1368 }
1369 }
1370 }
1371 JVM_END
1372
1373 /**
1374 * Throws a java/lang/UnsupportedOperationException unconditionally.
1375 * This is required by the specification of MethodHandle.invoke if
1376 * invoked directly.
1377 */
1378 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1379 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1380 return NULL;
1381 }
1382 JVM_END
1383
1384 /**
1385 * Throws a java/lang/UnsupportedOperationException unconditionally.
1386 * This is required by the specification of MethodHandle.invokeExact if
1387 * invoked directly.
1388 */
1389 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1390 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1391 return NULL;
1392 }
1393 JVM_END
1394
1395 /// JVM_RegisterMethodHandleMethods
1396
1397 #undef CS // Solaris builds complain
1398
1399 #define LANG "Ljava/lang/"
1400 #define JLINV "Ljava/lang/invoke/"
1401
1402 #define OBJ LANG "Object;"
1403 #define CLS LANG "Class;"
1404 #define STRG LANG "String;"
1405 #define CS JLINV "CallSite;"
1406 #define MT JLINV "MethodType;"
1407 #define MH JLINV "MethodHandle;"
1408 #define MEM JLINV "MemberName;"
1409 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1410
1411 #define CC (char*) /*cast a literal from (const char*)*/
1412 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1413
1414 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1415 static JNINativeMethod MHN_methods[] = {
1416 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1417 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1418 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)},
1419 // static native int getNamedCon(int which, Object[] name)
1420 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1421 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1422 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1423 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1424 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1425 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1426 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1427 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1428 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1429 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1430 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1431 };
1432
1433 static JNINativeMethod MH_methods[] = {
1434 // UnsupportedOperationException throwers
1435 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1436 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1437 };
1438
1439 /**
1440 * Helper method to register native methods.
1441 */
1442 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1443 int status = env->RegisterNatives(clazz, methods, nMethods);
1444 if (status != JNI_OK || env->ExceptionOccurred()) {
1445 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1446 env->ExceptionClear();
1447 return false;
1448 }
1449 return true;
1450 }
1451
1452 /**
1453 * This one function is exported, used by NativeLookup.
1454 */
1455 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1456 assert(!MethodHandles::enabled(), "must not be enabled");
1457 bool enable_MH = true;
1458
1459 jclass MH_class = NULL;
1460 if (SystemDictionary::MethodHandle_klass() == NULL) {
1461 enable_MH = false;
1462 } else {
1463 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1464 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1465 }
1466
1467 if (enable_MH) {
1468 ThreadToNativeFromVM ttnfv(thread);
1469
1470 if (enable_MH) {
1471 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1472 }
1473 if (enable_MH) {
1474 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1475 }
1476 }
1477
1478 if (TraceInvokeDynamic) {
1479 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1480 }
1481
1482 if (enable_MH) {
1483 if (MethodHandles::generate_adapters() == false) {
1484 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters");
1485 }
1486 MethodHandles::set_enabled(true);
1487 }
1488 }
1489 JVM_END