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 "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 "logging/log.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/oopFactory.hpp"
38 #include "oops/objArrayOop.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/methodHandles.hpp"
41 #include "prims/jvmtiRedefineClassesTrace.hpp"
42 #include "runtime/compilationPolicy.hpp"
43 #include "runtime/javaCalls.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 TraceTime timer("MethodHandles adapters generation",
81 log_is_enabled(Info, startuptime),
82 LogTag::_startuptime);
83 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
84 if (_adapter_code == NULL) {
85 return false;
86 }
87
88 CodeBuffer code(_adapter_code);
89 MethodHandlesAdapterGenerator g(&code);
90 g.generate();
91 code.log_section_sizes("MethodHandlesAdapterBlob");
92 return true;
93 }
94
95 //------------------------------------------------------------------------------
96 // MethodHandlesAdapterGenerator::generate
97 //
98 void MethodHandlesAdapterGenerator::generate() {
99 // Generate generic method handle adapters.
100 // Generate interpreter entries
101 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
102 mk <= Interpreter::method_handle_invoke_LAST;
103 mk = Interpreter::MethodKind(1 + (int)mk)) {
104 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
105 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
106 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
107 if (entry != NULL) {
108 CodeCacheExtensions::handle_generated_pc(entry, vmIntrinsics::name_at(iid));
109 Interpreter::set_entry_for_kind(mk, entry);
110 }
111 // If the entry is not set, it will throw AbstractMethodError.
112 }
113 }
114
115 void MethodHandles::set_enabled(bool z) {
116 if (_enabled != z) {
117 guarantee(z, "can only enable once");
118 _enabled = z;
119 }
120 }
121
122 // MemberName support
123
124 // import java_lang_invoke_MemberName.*
125 enum {
126 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
127 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
128 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
129 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
130 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
131 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
132 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
133 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
134 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
135 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
136 };
137
138 Handle MethodHandles::new_MemberName(TRAPS) {
139 Handle empty;
140 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
141 if (!k->is_initialized()) k->initialize(CHECK_(empty));
142 return Handle(THREAD, k->allocate_instance(THREAD));
143 }
144
145 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
146 // This method is used from java.lang.invoke.MemberName constructors.
147 // It fills in the new MemberName from a java.lang.reflect.Member.
148 Thread* thread = Thread::current();
149 oop target_oop = target();
150 Klass* target_klass = target_oop->klass();
151 if (target_klass == SystemDictionary::reflect_Field_klass()) {
152 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
153 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
154 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
155 if (!k.is_null() && k->is_instance_klass()) {
156 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
157 oop mname2 = init_field_MemberName(mname, fd);
158 if (mname2 != NULL) {
159 // Since we have the reified name and type handy, add them to the result.
160 if (java_lang_invoke_MemberName::name(mname2) == NULL)
161 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
162 if (java_lang_invoke_MemberName::type(mname2) == NULL)
163 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
164 }
165 return mname2;
166 }
167 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
168 oop clazz = java_lang_reflect_Method::clazz(target_oop);
169 int slot = java_lang_reflect_Method::slot(target_oop);
170 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
171 if (!k.is_null() && k->is_instance_klass()) {
172 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
173 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
174 return NULL; // do not resolve unless there is a concrete signature
175 CallInfo info(m, k());
176 return init_method_MemberName(mname, info);
177 }
178 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
179 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
180 int slot = java_lang_reflect_Constructor::slot(target_oop);
181 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
182 if (!k.is_null() && k->is_instance_klass()) {
183 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
184 if (m == NULL) return NULL;
185 CallInfo info(m, k());
186 return init_method_MemberName(mname, info);
187 }
188 }
189 return NULL;
190 }
191
192 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
193 assert(info.resolved_appendix().is_null(), "only normal methods here");
194 methodHandle m = info.resolved_method();
195 assert(m.not_null(), "null method handle");
196 KlassHandle m_klass = m->method_holder();
197 assert(m.not_null(), "null holder for method handle");
198 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
199 int vmindex = Method::invalid_vtable_index;
200
201 switch (info.call_kind()) {
202 case CallInfo::itable_call:
203 vmindex = info.itable_index();
204 // More importantly, the itable index only works with the method holder.
205 assert(m_klass->verify_itable_index(vmindex), "");
206 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
207 if (TraceInvokeDynamic) {
208 ttyLocker ttyl;
209 ResourceMark rm;
210 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
211 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
212 vmindex);
213 m->access_flags().print_on(tty);
214 if (!m->is_abstract()) {
215 tty->print("default");
216 }
217 tty->cr();
218 }
219 break;
220
221 case CallInfo::vtable_call:
222 vmindex = info.vtable_index();
223 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
224 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
225 if (m_klass->is_interface()) {
226 // This is a vtable call to an interface method (abstract "miranda method" or default method).
227 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
228 // (LinkResolver should help us figure this out.)
229 KlassHandle m_klass_non_interface = info.resolved_klass();
230 if (m_klass_non_interface->is_interface()) {
231 m_klass_non_interface = SystemDictionary::Object_klass();
232 #ifdef ASSERT
233 { ResourceMark rm;
234 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
235 assert(m->name() == m2->name() && m->signature() == m2->signature(),
236 "at %d, %s != %s", vmindex,
237 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
238 }
239 #endif //ASSERT
240 }
241 if (!m->is_public()) {
242 assert(m->is_public(), "virtual call must be to public interface method");
243 return NULL; // elicit an error later in product build
244 }
245 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
246 m_klass = m_klass_non_interface;
247 }
248 if (TraceInvokeDynamic) {
249 ttyLocker ttyl;
250 ResourceMark rm;
251 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
252 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
253 m_klass->internal_name(), vmindex);
254 m->access_flags().print_on(tty);
255 if (m->is_default_method()) {
256 tty->print("default");
257 }
258 tty->cr();
259 }
260 break;
261
262 case CallInfo::direct_call:
263 vmindex = Method::nonvirtual_vtable_index;
264 if (m->is_static()) {
265 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
266 } else if (m->is_initializer()) {
267 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
268 } else {
269 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
270 }
271 break;
272
273 default: assert(false, "bad CallInfo"); return NULL;
274 }
275
276 // @CallerSensitive annotation detected
277 if (m->caller_sensitive()) {
278 flags |= CALLER_SENSITIVE;
279 }
280
281 oop mname_oop = mname();
282 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
283 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
284 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
285 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
286 // Note: name and type can be lazily computed by resolve_MemberName,
287 // if Java code needs them as resolved String and MethodType objects.
288 // The clazz must be eagerly stored, because it provides a GC
289 // root to help keep alive the Method*.
290 // If relevant, the vtable or itable value is stored as vmindex.
291 // This is done eagerly, since it is readily available without
292 // constructing any new objects.
293 // TO DO: maybe intern mname_oop
294 if (m->method_holder()->add_member_name(mname)) {
295 return mname();
296 } else {
297 // Redefinition caused this to fail. Return NULL (and an exception?)
298 return NULL;
299 }
300 }
301
302 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
303 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
304 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
305 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
306 Metadata* vmtarget = fd.field_holder();
307 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
308 oop mname_oop = mname();
309 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
310 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
311 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
312 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
313 oop type = field_signature_type_or_null(fd.signature());
314 oop name = field_name_or_null(fd.name());
315 if (name != NULL)
316 java_lang_invoke_MemberName::set_name(mname_oop, name);
317 if (type != NULL)
318 java_lang_invoke_MemberName::set_type(mname_oop, type);
319 // Note: name and type can be lazily computed by resolve_MemberName,
320 // if Java code needs them as resolved String and Class objects.
321 // Note that the incoming type oop might be pre-resolved (non-null).
322 // The base clazz and field offset (vmindex) must be eagerly stored,
323 // because they unambiguously identify the field.
324 // Although the fieldDescriptor::_index would also identify the field,
325 // we do not use it, because it is harder to decode.
326 // TO DO: maybe intern mname_oop
327 return mname();
328 }
329
330 // JVM 2.9 Special Methods:
331 // A method is signature polymorphic if and only if all of the following conditions hold :
332 // * It is declared in the java.lang.invoke.MethodHandle class.
333 // * It has a single formal parameter of type Object[].
334 // * It has a return type of Object.
335 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
336 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
337 if (klass == NULL)
338 return false;
339 // The following test will fail spuriously during bootstrap of MethodHandle itself:
340 // if (klass != SystemDictionary::MethodHandle_klass())
341 // Test the name instead:
342 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
343 return false;
344 Symbol* poly_sig = vmSymbols::object_array_object_signature();
345 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
346 if (m == NULL) return false;
347 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
348 int flags = m->access_flags().as_int();
349 return (flags & required) == required;
350 }
351
352
353 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
354 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
355 switch (iid) {
356 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
357 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
358 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
359 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
360 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
361 }
362 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
363 return 0;
364 }
365
366 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
367 switch(id) {
368 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
369 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
370 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
371 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
372 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
373 default:
374 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
375 return Bytecodes::_illegal;
376 }
377 }
378
379 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
380 switch (iid) {
381 case vmIntrinsics::_invokeBasic: return 0;
382 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
383 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
384 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
385 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
386 }
387 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
388 return 0;
389 }
390
391 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
392 vmSymbols::SID name_id = vmSymbols::find_sid(name);
393 switch (name_id) {
394 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
395 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
396 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
397 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
398
399 // There is one static signature-polymorphic method for each JVM invocation mode.
400 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
401 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
402 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
403 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
404 }
405
406 // Cover the case of invokeExact and any future variants of invokeFoo.
407 Klass* mh_klass = SystemDictionary::well_known_klass(
408 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
409 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
410 return vmIntrinsics::_invokeGeneric;
411
412 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
413 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
414 return vmIntrinsics::_none;
415 }
416
417 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
418 if (klass != NULL &&
419 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
420 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
421 if (iid != vmIntrinsics::_none)
422 return iid;
423 if (is_method_handle_invoke_name(klass, name))
424 return vmIntrinsics::_invokeGeneric;
425 }
426 return vmIntrinsics::_none;
427 }
428
429
430 // convert the external string or reflective type to an internal signature
431 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
432 if (java_lang_invoke_MethodType::is_instance(type_str)) {
433 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
434 } else if (java_lang_Class::is_instance(type_str)) {
435 return java_lang_Class::as_signature(type_str, false, THREAD);
436 } else if (java_lang_String::is_instance_inlined(type_str)) {
437 if (intern_if_not_found) {
438 return java_lang_String::as_symbol(type_str, THREAD);
439 } else {
440 return java_lang_String::as_symbol_or_null(type_str);
441 }
442 } else {
443 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
444 }
445 }
446
447 static const char OBJ_SIG[] = "Ljava/lang/Object;";
448 enum { OBJ_SIG_LEN = 18 };
449
450 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
451 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
452 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
453 const int len = sig->utf8_length();
454 for (int i = 0; i < len; i++) {
455 switch (sig->byte_at(i)) {
456 case 'L':
457 // only java/lang/Object is valid here
458 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
459 return false;
460 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
461 continue;
462 case '(': case ')': case 'V':
463 case 'I': case 'J': case 'F': case 'D':
464 continue;
465 //case '[':
466 //case 'Z': case 'B': case 'C': case 'S':
467 default:
468 return false;
469 }
470 }
471 return true;
472 }
473
474 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
475 Symbol* bsig = NULL;
476 if (sig == NULL) {
477 return sig;
478 } else if (is_basic_type_signature(sig)) {
479 sig->increment_refcount();
480 return sig; // that was easy
481 } else if (sig->byte_at(0) != '(') {
482 BasicType bt = char2type(sig->byte_at(0));
483 if (is_subword_type(bt)) {
484 bsig = vmSymbols::int_signature();
485 } else {
486 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
487 bsig = vmSymbols::object_signature();
488 }
489 } else {
490 ResourceMark rm;
491 stringStream buffer(128);
492 buffer.put('(');
493 int arg_pos = 0, keep_arg_pos = -1;
494 if (keep_last_arg)
495 keep_arg_pos = ArgumentCount(sig).size() - 1;
496 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
497 BasicType bt = ss.type();
498 size_t this_arg_pos = buffer.size();
499 if (ss.at_return_type()) {
500 buffer.put(')');
501 }
502 if (arg_pos == keep_arg_pos) {
503 buffer.write((char*) ss.raw_bytes(),
504 (int) ss.raw_length());
505 } else if (bt == T_OBJECT || bt == T_ARRAY) {
506 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
507 } else {
508 if (is_subword_type(bt))
509 bt = T_INT;
510 buffer.put(type2char(bt));
511 }
512 arg_pos++;
513 }
514 const char* sigstr = buffer.base();
515 int siglen = (int) buffer.size();
516 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
517 }
518 assert(is_basic_type_signature(bsig) ||
519 // detune assert in case the injected argument is not a basic type:
520 keep_last_arg, "");
521 return bsig;
522 }
523
524 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
525 Symbol* sig,
526 bool keep_arrays,
527 bool keep_basic_names) {
528 st = st ? st : tty;
529 int len = sig->utf8_length();
530 int array = 0;
531 bool prev_type = false;
532 for (int i = 0; i < len; i++) {
533 char ch = sig->byte_at(i);
534 switch (ch) {
535 case '(': case ')':
536 prev_type = false;
537 st->put(ch);
538 continue;
539 case '[':
540 if (!keep_basic_names && keep_arrays)
541 st->put(ch);
542 array++;
543 continue;
544 case 'L':
545 {
546 if (prev_type) st->put(',');
547 int start = i+1, slash = start;
548 while (++i < len && (ch = sig->byte_at(i)) != ';') {
549 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
550 }
551 if (slash < i) start = slash;
552 if (!keep_basic_names) {
553 st->put('L');
554 } else {
555 for (int j = start; j < i; j++)
556 st->put(sig->byte_at(j));
557 prev_type = true;
558 }
559 break;
560 }
561 default:
562 {
563 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
564 ch = '[';
565 array = 0;
566 }
567 if (prev_type) st->put(',');
568 const char* n = NULL;
569 if (keep_basic_names)
570 n = type2name(char2type(ch));
571 if (n == NULL) {
572 // unknown letter, or we don't want to know its name
573 st->put(ch);
574 } else {
575 st->print("%s", n);
576 prev_type = true;
577 }
578 break;
579 }
580 }
581 // Switch break goes here to take care of array suffix:
582 if (prev_type) {
583 while (array > 0) {
584 st->print("[]");
585 --array;
586 }
587 }
588 array = 0;
589 }
590 }
591
592
593
594 static oop object_java_mirror() {
595 return SystemDictionary::Object_klass()->java_mirror();
596 }
597
598 oop MethodHandles::field_name_or_null(Symbol* s) {
599 if (s == NULL) return NULL;
600 return StringTable::lookup(s);
601 }
602
603 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
604 if (s == NULL) return NULL;
605 BasicType bt = FieldType::basic_type(s);
606 if (is_java_primitive(bt)) {
607 assert(s->utf8_length() == 1, "");
608 return java_lang_Class::primitive_mirror(bt);
609 }
610 // Here are some more short cuts for common types.
611 // They are optional, since reference types can be resolved lazily.
612 if (bt == T_OBJECT) {
613 if (s == vmSymbols::object_signature()) {
614 return object_java_mirror();
615 } else if (s == vmSymbols::class_signature()) {
616 return SystemDictionary::Class_klass()->java_mirror();
617 } else if (s == vmSymbols::string_signature()) {
618 return SystemDictionary::String_klass()->java_mirror();
619 }
620 }
621 return NULL;
622 }
623
624
625 // An unresolved member name is a mere symbolic reference.
626 // Resolving it plants a vmtarget/vmindex in it,
627 // which refers directly to JVM internals.
628 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
629 Handle empty;
630 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
631
632 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
633 // Already resolved.
634 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
635 assert(vmindex >= Method::nonvirtual_vtable_index, "");
636 return mname;
637 }
638
639 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
640 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
641 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
642 int flags = java_lang_invoke_MemberName::flags(mname());
643 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
644 if (!ref_kind_is_valid(ref_kind)) {
645 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
646 }
647
648 DEBUG_ONLY(int old_vmindex);
649 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
650
651 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
652 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
653 }
654
655 instanceKlassHandle defc;
656 {
657 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
658 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
659 if (!defc_klass->is_instance_klass()) {
660 if (!defc_klass->is_array_klass()) return empty;
661 defc_klass = SystemDictionary::Object_klass();
662 }
663 defc = instanceKlassHandle(THREAD, defc_klass);
664 }
665 if (defc.is_null()) {
666 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
667 }
668 defc->link_class(CHECK_(empty)); // possible safepoint
669
670 // convert the external string name to an internal symbol
671 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
672 if (name == NULL) return empty; // no such name
673 if (name == vmSymbols::class_initializer_name())
674 return empty; // illegal name
675
676 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
677 if ((flags & ALL_KINDS) == IS_METHOD &&
678 (defc() == SystemDictionary::MethodHandle_klass()) &&
679 (ref_kind == JVM_REF_invokeVirtual ||
680 ref_kind == JVM_REF_invokeSpecial ||
681 // static invocation mode is required for _linkToVirtual, etc.:
682 ref_kind == JVM_REF_invokeStatic)) {
683 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
684 if (iid != vmIntrinsics::_none &&
685 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
686 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
687 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
688 mh_invoke_id = iid;
689 }
690 }
691
692 // convert the external string or reflective type to an internal signature
693 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
694 if (type == NULL) return empty; // no such signature exists in the VM
695
696 // Time to do the lookup.
697 switch (flags & ALL_KINDS) {
698 case IS_METHOD:
699 {
700 CallInfo result;
701 LinkInfo link_info(defc, name, type, caller, caller.not_null());
702 {
703 assert(!HAS_PENDING_EXCEPTION, "");
704 if (ref_kind == JVM_REF_invokeStatic) {
705 LinkResolver::resolve_static_call(result,
706 link_info, false, THREAD);
707 } else if (ref_kind == JVM_REF_invokeInterface) {
708 LinkResolver::resolve_interface_call(result, Handle(), defc,
709 link_info, false, THREAD);
710 } else if (mh_invoke_id != vmIntrinsics::_none) {
711 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
712 LinkResolver::resolve_handle_call(result, link_info, THREAD);
713 } else if (ref_kind == JVM_REF_invokeSpecial) {
714 LinkResolver::resolve_special_call(result,
715 link_info, THREAD);
716 } else if (ref_kind == JVM_REF_invokeVirtual) {
717 LinkResolver::resolve_virtual_call(result, Handle(), defc,
718 link_info, false, THREAD);
719 } else {
720 assert(false, "ref_kind=%d", ref_kind);
721 }
722 if (HAS_PENDING_EXCEPTION) {
723 return empty;
724 }
725 }
726 if (result.resolved_appendix().not_null()) {
727 // The resolved MemberName must not be accompanied by an appendix argument,
728 // since there is no way to bind this value into the MemberName.
729 // Caller is responsible to prevent this from happening.
730 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
731 }
732 oop mname2 = init_method_MemberName(mname, result);
733 return Handle(THREAD, mname2);
734 }
735 case IS_CONSTRUCTOR:
736 {
737 CallInfo result;
738 LinkInfo link_info(defc, name, type, caller, caller.not_null());
739 {
740 assert(!HAS_PENDING_EXCEPTION, "");
741 if (name == vmSymbols::object_initializer_name()) {
742 LinkResolver::resolve_special_call(result, link_info, THREAD);
743 } else {
744 break; // will throw after end of switch
745 }
746 if (HAS_PENDING_EXCEPTION) {
747 return empty;
748 }
749 }
750 assert(result.is_statically_bound(), "");
751 oop mname2 = init_method_MemberName(mname, result);
752 return Handle(THREAD, mname2);
753 }
754 case IS_FIELD:
755 {
756 fieldDescriptor result; // find_field initializes fd if found
757 {
758 assert(!HAS_PENDING_EXCEPTION, "");
759 LinkInfo link_info(defc, name, type, caller, /*check_access*/false);
760 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
761 if (HAS_PENDING_EXCEPTION) {
762 return empty;
763 }
764 }
765 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
766 return Handle(THREAD, mname2);
767 }
768 default:
769 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
770 }
771
772 return empty;
773 }
774
775 // Conversely, a member name which is only initialized from JVM internals
776 // may have null defc, name, and type fields.
777 // Resolving it plants a vmtarget/vmindex in it,
778 // which refers directly to JVM internals.
779 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
780 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
781 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
782 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
783 if (vmtarget == NULL) {
784 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
785 }
786
787 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
788 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
789 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
790 int flags = java_lang_invoke_MemberName::flags(mname());
791
792 if (suppress != 0) {
793 if (suppress & _suppress_defc) have_defc = true;
794 if (suppress & _suppress_name) have_name = true;
795 if (suppress & _suppress_type) have_type = true;
796 }
797
798 if (have_defc && have_name && have_type) return; // nothing needed
799
800 switch (flags & ALL_KINDS) {
801 case IS_METHOD:
802 case IS_CONSTRUCTOR:
803 {
804 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
805 methodHandle m(THREAD, (Method*)vmtarget);
806 DEBUG_ONLY(vmtarget = NULL); // safety
807 if (m.is_null()) break;
808 if (!have_defc) {
809 InstanceKlass* defc = m->method_holder();
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(m->name(), CHECK);
815 java_lang_invoke_MemberName::set_name(mname(), name());
816 }
817 if (!have_type) {
818 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
819 java_lang_invoke_MemberName::set_type(mname(), type());
820 }
821 return;
822 }
823 case IS_FIELD:
824 {
825 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
826 if (!((Klass*) vmtarget)->is_instance_klass()) break;
827 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
828 DEBUG_ONLY(vmtarget = NULL); // safety
829 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
830 fieldDescriptor fd; // find_field initializes fd if found
831 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
832 break; // cannot expand
833 if (!have_defc) {
834 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
835 }
836 if (!have_name) {
837 //not java_lang_String::create_from_symbol; let's intern member names
838 Handle name = StringTable::intern(fd.name(), CHECK);
839 java_lang_invoke_MemberName::set_name(mname(), name());
840 }
841 if (!have_type) {
842 // If it is a primitive field type, don't mess with short strings like "I".
843 Handle type = field_signature_type_or_null(fd.signature());
844 if (type.is_null()) {
845 java_lang_String::create_from_symbol(fd.signature(), CHECK);
846 }
847 java_lang_invoke_MemberName::set_type(mname(), type());
848 }
849 return;
850 }
851 }
852 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
853 }
854
855 int MethodHandles::find_MemberNames(KlassHandle k,
856 Symbol* name, Symbol* sig,
857 int mflags, KlassHandle caller,
858 int skip, objArrayHandle results) {
859 // %%% take caller into account!
860
861 Thread* thread = Thread::current();
862
863 if (k.is_null() || !k->is_instance_klass()) return -1;
864
865 int rfill = 0, rlimit = results->length(), rskip = skip;
866 // overflow measurement:
867 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
868
869 int match_flags = mflags;
870 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
871 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
872 bool local_only = !(search_superc | search_intfc);
873 bool classes_only = false;
874
875 if (name != NULL) {
876 if (name->utf8_length() == 0) return 0; // a match is not possible
877 }
878 if (sig != NULL) {
879 if (sig->utf8_length() == 0) return 0; // a match is not possible
880 if (sig->byte_at(0) == '(')
881 match_flags &= ~(IS_FIELD | IS_TYPE);
882 else
883 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
884 }
885
886 if ((match_flags & IS_TYPE) != 0) {
887 // NYI, and Core Reflection works quite well for this query
888 }
889
890 if ((match_flags & IS_FIELD) != 0) {
891 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
892 if (name != NULL && st.name() != name)
893 continue;
894 if (sig != NULL && st.signature() != sig)
895 continue;
896 // passed the filters
897 if (rskip > 0) {
898 --rskip;
899 } else if (rfill < rlimit) {
900 Handle result(thread, results->obj_at(rfill++));
901 if (!java_lang_invoke_MemberName::is_instance(result()))
902 return -99; // caller bug!
903 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
904 if (saved != result())
905 results->obj_at_put(rfill-1, saved); // show saved instance to user
906 } else if (++overflow >= overflow_limit) {
907 match_flags = 0; break; // got tired of looking at overflow
908 }
909 }
910 }
911
912 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
913 // watch out for these guys:
914 Symbol* init_name = vmSymbols::object_initializer_name();
915 Symbol* clinit_name = vmSymbols::class_initializer_name();
916 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
917 bool negate_name_test = false;
918 // fix name so that it captures the intention of IS_CONSTRUCTOR
919 if (!(match_flags & IS_METHOD)) {
920 // constructors only
921 if (name == NULL) {
922 name = init_name;
923 } else if (name != init_name) {
924 return 0; // no constructors of this method name
925 }
926 } else if (!(match_flags & IS_CONSTRUCTOR)) {
927 // methods only
928 if (name == NULL) {
929 name = init_name;
930 negate_name_test = true; // if we see the name, we *omit* the entry
931 } else if (name == init_name) {
932 return 0; // no methods of this constructor name
933 }
934 } else {
935 // caller will accept either sort; no need to adjust name
936 }
937 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
938 Method* m = st.method();
939 Symbol* m_name = m->name();
940 if (m_name == clinit_name)
941 continue;
942 if (name != NULL && ((m_name != name) ^ negate_name_test))
943 continue;
944 if (sig != NULL && m->signature() != sig)
945 continue;
946 // passed the filters
947 if (rskip > 0) {
948 --rskip;
949 } else if (rfill < rlimit) {
950 Handle result(thread, results->obj_at(rfill++));
951 if (!java_lang_invoke_MemberName::is_instance(result()))
952 return -99; // caller bug!
953 CallInfo info(m);
954 oop saved = MethodHandles::init_method_MemberName(result, info);
955 if (saved != result())
956 results->obj_at_put(rfill-1, saved); // show saved instance to user
957 } else if (++overflow >= overflow_limit) {
958 match_flags = 0; break; // got tired of looking at overflow
959 }
960 }
961 }
962
963 // return number of elements we at leasted wanted to initialize
964 return rfill + overflow;
965 }
966
967 // Is it safe to remove stale entries from a dependency list?
968 static bool safe_to_expunge() {
969 // Since parallel GC threads can concurrently iterate over a dependency
970 // list during safepoint, it is safe to remove entries only when
971 // CodeCache lock is held.
972 return CodeCache_lock->owned_by_self();
973 }
974
975 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
976 assert_locked_or_safepoint(CodeCache_lock);
977
978 oop context = java_lang_invoke_CallSite::context(call_site);
979 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
980 // Try to purge stale entries on updates.
981 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
982 // in order to avoid memory leak, stale entries are purged whenever a dependency list
983 // is changed (both on addition and removal). Though memory reclamation is delayed,
984 // it avoids indefinite memory usage growth.
985 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
986 }
987
988 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
989 assert_locked_or_safepoint(CodeCache_lock);
990
991 oop context = java_lang_invoke_CallSite::context(call_site);
992 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
993 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
994 }
995
996 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
997 assert_lock_strong(Compile_lock);
998
999 int marked = 0;
1000 CallSiteDepChange changes(call_site(), target());
1001 {
1002 NoSafepointVerifier nsv;
1003 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1004
1005 oop context = java_lang_invoke_CallSite::context(call_site());
1006 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1007 marked = deps.mark_dependent_nmethods(changes);
1008 }
1009 if (marked > 0) {
1010 // At least one nmethod has been marked for deoptimization.
1011 VM_Deoptimize op;
1012 VMThread::execute(&op);
1013 }
1014 }
1015
1016 //------------------------------------------------------------------------------
1017 // MemberNameTable
1018 //
1019
1020 MemberNameTable::MemberNameTable(int methods_cnt)
1021 : GrowableArray<jweak>(methods_cnt, true) {
1022 assert_locked_or_safepoint(MemberNameTable_lock);
1023 }
1024
1025 MemberNameTable::~MemberNameTable() {
1026 assert_locked_or_safepoint(MemberNameTable_lock);
1027 int len = this->length();
1028
1029 for (int idx = 0; idx < len; idx++) {
1030 jweak ref = this->at(idx);
1031 JNIHandles::destroy_weak_global(ref);
1032 }
1033 }
1034
1035 void MemberNameTable::add_member_name(jweak mem_name_wref) {
1036 assert_locked_or_safepoint(MemberNameTable_lock);
1037 this->push(mem_name_wref);
1038 }
1039
1040 #if INCLUDE_JVMTI
1041 // It is called at safepoint only for RedefineClasses
1042 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) {
1043 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
1044 // For each redefined method
1045 for (int idx = 0; idx < length(); idx++) {
1046 oop mem_name = JNIHandles::resolve(this->at(idx));
1047 if (mem_name == NULL) {
1048 continue;
1049 }
1050 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
1051
1052 if (old_method == NULL || !old_method->is_old()) {
1053 continue; // skip uninteresting entries
1054 }
1055 if (old_method->is_deleted()) {
1056 // skip entries with deleted methods
1057 continue;
1058 }
1059 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum());
1060
1061 assert(new_method != NULL, "method_with_idnum() should not be NULL");
1062 assert(old_method != new_method, "sanity check");
1063
1064 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method);
1065
1066 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1067 if (!(*trace_name_printed)) {
1068 // RC_TRACE_MESG macro has an embedded ResourceMark
1069 RC_TRACE_MESG(("adjust: name=%s",
1070 old_method->method_holder()->external_name()));
1071 *trace_name_printed = true;
1072 }
1073 // RC_TRACE macro has an embedded ResourceMark
1074 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
1075 new_method->name()->as_C_string(),
1076 new_method->signature()->as_C_string()));
1077 }
1078 }
1079 }
1080 #endif // INCLUDE_JVMTI
1081
1082 //
1083 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1084 // They are the private interface between this JVM and the HotSpot-specific
1085 // Java code that implements JSR 292 method handles.
1086 //
1087 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1088 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1089 //
1090
1091 #ifndef PRODUCT
1092 #define EACH_NAMED_CON(template, requirement) \
1093 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1094 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1095 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1096 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1097 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1098 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1099 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1100 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1101 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1102 /*end*/
1103
1104 #define IGNORE_REQ(req_expr) /* req_expr */
1105 #define ONE_PLUS(scope,value) 1+
1106 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1107 #define VALUE_COMMA(scope,value) scope::value,
1108 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1109 #define STRING_NULL(scope,value) #value "\0"
1110 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1111
1112 static bool advertise_con_value(int which) {
1113 if (which < 0) return false;
1114 bool ok = true;
1115 int count = 0;
1116 #define INC_COUNT(scope,value) \
1117 ++count;
1118 #define CHECK_REQ(req_expr) \
1119 if (which < count) return ok; \
1120 ok = (req_expr);
1121 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1122 #undef INC_COUNT
1123 #undef CHECK_REQ
1124 assert(count == con_value_count, "");
1125 if (which < count) return ok;
1126 return false;
1127 }
1128
1129 #undef ONE_PLUS
1130 #undef VALUE_COMMA
1131 #undef STRING_NULL
1132 #undef EACH_NAMED_CON
1133 #endif // PRODUCT
1134
1135 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1136 #ifndef PRODUCT
1137 if (advertise_con_value(which)) {
1138 assert(which >= 0 && which < con_value_count, "");
1139 int con = con_values[which];
1140 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1141 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1142 const char* str = &con_names[0];
1143 for (int i = 0; i < which; i++)
1144 str += strlen(str) + 1; // skip name and null
1145 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1146 box->obj_at_put(0, name);
1147 }
1148 return con;
1149 }
1150 #endif
1151 return 0;
1152 }
1153 JVM_END
1154
1155 // void init(MemberName self, AccessibleObject ref)
1156 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1157 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1158 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1159 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1160 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1161 MethodHandles::init_MemberName(mname, target);
1162 }
1163 JVM_END
1164
1165 // void expand(MemberName self)
1166 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1167 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1168 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1169 MethodHandles::expand_MemberName(mname, 0, CHECK);
1170 }
1171 JVM_END
1172
1173 // void resolve(MemberName self, Class<?> caller)
1174 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1175 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1176 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1177
1178 // The trusted Java code that calls this method should already have performed
1179 // access checks on behalf of the given caller. But, we can verify this.
1180 if (VerifyMethodHandles && caller_jh != NULL &&
1181 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1182 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1183 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1184 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1185 }
1186
1187 // Reflection::verify_class_access can only handle instance classes.
1188 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1189 // Emulate LinkResolver::check_klass_accessability.
1190 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1191 if (!Reflection::verify_class_access(caller,
1192 reference_klass,
1193 true)) {
1194 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1195 }
1196 }
1197 }
1198
1199 KlassHandle caller(THREAD,
1200 caller_jh == NULL ? (Klass*) NULL :
1201 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1202 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1203
1204 if (resolved.is_null()) {
1205 int flags = java_lang_invoke_MemberName::flags(mname());
1206 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1207 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1208 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1209 }
1210 if ((flags & ALL_KINDS) == IS_FIELD) {
1211 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1212 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1213 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1214 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1215 } else {
1216 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1217 }
1218 }
1219
1220 return JNIHandles::make_local(THREAD, resolved());
1221 }
1222 JVM_END
1223
1224 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1225 if (mname == NULL ||
1226 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1227 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1228 } else {
1229 int flags = java_lang_invoke_MemberName::flags(mname);
1230 if ((flags & IS_FIELD) != 0 &&
1231 (must_be_static
1232 ? (flags & JVM_ACC_STATIC) != 0
1233 : (flags & JVM_ACC_STATIC) == 0)) {
1234 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1235 return (jlong) vmindex;
1236 }
1237 }
1238 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1239 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1240 return 0;
1241 }
1242
1243 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1244 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1245 }
1246 JVM_END
1247
1248 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1249 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1250 }
1251 JVM_END
1252
1253 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1254 // use the other function to perform sanity checks:
1255 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1256 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1257 return JNIHandles::make_local(THREAD, clazz);
1258 }
1259 JVM_END
1260
1261 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1262 if (mname_jh == NULL) return NULL;
1263 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1264 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1265 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1266 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1267 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1268 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1269 result->obj_at_put(0, x);
1270 x = NULL;
1271 if (vmtarget == NULL) {
1272 x = NULL;
1273 } else if (vmtarget->is_klass()) {
1274 x = ((Klass*) vmtarget)->java_mirror();
1275 } else if (vmtarget->is_method()) {
1276 x = mname();
1277 }
1278 result->obj_at_put(1, x);
1279 return JNIHandles::make_local(env, result());
1280 }
1281 JVM_END
1282
1283
1284
1285 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1286 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1287 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1288 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1289 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1290 if (clazz_jh == NULL || results_jh == NULL) return -1;
1291 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1292
1293 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1294 if (results.is_null() || !results->is_objArray()) return -1;
1295
1296 TempNewSymbol name = NULL;
1297 TempNewSymbol sig = NULL;
1298 if (name_jh != NULL) {
1299 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1300 if (name == NULL) return 0; // a match is not possible
1301 }
1302 if (sig_jh != NULL) {
1303 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1304 if (sig == NULL) return 0; // a match is not possible
1305 }
1306
1307 KlassHandle caller;
1308 if (caller_jh != NULL) {
1309 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1310 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1311 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1312 }
1313
1314 if (name != NULL && sig != NULL && results.not_null()) {
1315 // try a direct resolve
1316 // %%% TO DO
1317 }
1318
1319 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1320 caller, skip, results);
1321 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1322 return res;
1323 }
1324 JVM_END
1325
1326 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1327 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1328 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1329 {
1330 // Walk all nmethods depending on this call site.
1331 MutexLocker mu(Compile_lock, thread);
1332 MethodHandles::flush_dependent_nmethods(call_site, target);
1333 java_lang_invoke_CallSite::set_target(call_site(), target());
1334 }
1335 }
1336 JVM_END
1337
1338 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1339 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1340 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1341 {
1342 // Walk all nmethods depending on this call site.
1343 MutexLocker mu(Compile_lock, thread);
1344 MethodHandles::flush_dependent_nmethods(call_site, target);
1345 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1346 }
1347 }
1348 JVM_END
1349
1350 // It is called by a Cleaner object which ensures that dropped CallSites properly
1351 // deallocate their dependency information.
1352 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1353 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1354 {
1355 // Walk all nmethods depending on this call site.
1356 MutexLocker mu1(Compile_lock, thread);
1357
1358 int marked = 0;
1359 {
1360 NoSafepointVerifier nsv;
1361 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1362 assert(safe_to_expunge(), "removal is not safe");
1363 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1364 marked = deps.remove_all_dependents();
1365 }
1366 if (marked > 0) {
1367 // At least one nmethod has been marked for deoptimization
1368 VM_Deoptimize op;
1369 VMThread::execute(&op);
1370 }
1371 }
1372 }
1373 JVM_END
1374
1375 /**
1376 * Throws a java/lang/UnsupportedOperationException unconditionally.
1377 * This is required by the specification of MethodHandle.invoke if
1378 * invoked directly.
1379 */
1380 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1381 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1382 return NULL;
1383 }
1384 JVM_END
1385
1386 /**
1387 * Throws a java/lang/UnsupportedOperationException unconditionally.
1388 * This is required by the specification of MethodHandle.invokeExact if
1389 * invoked directly.
1390 */
1391 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1392 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1393 return NULL;
1394 }
1395 JVM_END
1396
1397 /// JVM_RegisterMethodHandleMethods
1398
1399 #undef CS // Solaris builds complain
1400
1401 #define LANG "Ljava/lang/"
1402 #define JLINV "Ljava/lang/invoke/"
1403
1404 #define OBJ LANG "Object;"
1405 #define CLS LANG "Class;"
1406 #define STRG LANG "String;"
1407 #define CS JLINV "CallSite;"
1408 #define MT JLINV "MethodType;"
1409 #define MH JLINV "MethodHandle;"
1410 #define MEM JLINV "MemberName;"
1411 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1412
1413 #define CC (char*) /*cast a literal from (const char*)*/
1414 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1415
1416 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1417 static JNINativeMethod MHN_methods[] = {
1418 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1419 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1420 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)},
1421 // static native int getNamedCon(int which, Object[] name)
1422 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1423 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1424 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1425 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1426 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1427 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1428 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1429 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1430 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1431 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1432 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1433 };
1434
1435 static JNINativeMethod MH_methods[] = {
1436 // UnsupportedOperationException throwers
1437 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1438 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1439 };
1440
1441 /**
1442 * Helper method to register native methods.
1443 */
1444 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1445 int status = env->RegisterNatives(clazz, methods, nMethods);
1446 if (status != JNI_OK || env->ExceptionOccurred()) {
1447 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1448 env->ExceptionClear();
1449 return false;
1450 }
1451 return true;
1452 }
1453
1454 /**
1455 * This one function is exported, used by NativeLookup.
1456 */
1457 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1458 assert(!MethodHandles::enabled(), "must not be enabled");
1459 bool enable_MH = true;
1460
1461 jclass MH_class = NULL;
1462 if (SystemDictionary::MethodHandle_klass() == NULL) {
1463 enable_MH = false;
1464 } else {
1465 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1466 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1467 }
1468
1469 if (enable_MH) {
1470 ThreadToNativeFromVM ttnfv(thread);
1471
1472 if (enable_MH) {
1473 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1474 }
1475 if (enable_MH) {
1476 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1477 }
1478 }
1479
1480 if (TraceInvokeDynamic) {
1481 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1482 }
1483
1484 if (enable_MH) {
1485 if (MethodHandles::generate_adapters() == false) {
1486 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters");
1487 }
1488 MethodHandles::set_enabled(true);
1489 }
1490 }
1491 JVM_END