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 "memory/resourceArea.hpp"
38 #include "oops/objArrayOop.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/methodHandles.hpp"
41 #include "runtime/compilationPolicy.hpp"
42 #include "runtime/javaCalls.hpp"
43 #include "runtime/timerTrace.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 * Generates method handle adapters. Returns 'false' if memory allocation
69 * failed and true otherwise.
70 */
71 void MethodHandles::generate_adapters() {
72 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
73 assert(_adapter_code == NULL, "generate only once");
74
75 ResourceMark rm;
76 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
77 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
78 CodeBuffer code(_adapter_code);
79 MethodHandlesAdapterGenerator g(&code);
80 g.generate();
81 code.log_section_sizes("MethodHandlesAdapterBlob");
82 }
83
84 //------------------------------------------------------------------------------
85 // MethodHandlesAdapterGenerator::generate
86 //
87 void MethodHandlesAdapterGenerator::generate() {
88 // Generate generic method handle adapters.
89 // Generate interpreter entries
90 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
91 mk <= Interpreter::method_handle_invoke_LAST;
92 mk = Interpreter::MethodKind(1 + (int)mk)) {
93 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
94 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
95 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
96 if (entry != NULL) {
97 CodeCacheExtensions::handle_generated_pc(entry, vmIntrinsics::name_at(iid));
98 Interpreter::set_entry_for_kind(mk, entry);
99 }
100 // If the entry is not set, it will throw AbstractMethodError.
101 }
102 }
103
104 void MethodHandles::set_enabled(bool z) {
105 if (_enabled != z) {
106 guarantee(z, "can only enable once");
107 _enabled = z;
108 }
109 }
110
111 // MemberName support
112
113 // import java_lang_invoke_MemberName.*
114 enum {
115 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
116 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
117 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
118 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
119 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
120 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
121 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
122 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
123 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
124 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
125 };
126
127 Handle MethodHandles::new_MemberName(TRAPS) {
128 Handle empty;
129 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
130 if (!k->is_initialized()) k->initialize(CHECK_(empty));
131 return Handle(THREAD, k->allocate_instance(THREAD));
132 }
133
134 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
135 // This method is used from java.lang.invoke.MemberName constructors.
136 // It fills in the new MemberName from a java.lang.reflect.Member.
137 Thread* thread = Thread::current();
138 oop target_oop = target();
139 Klass* target_klass = target_oop->klass();
140 if (target_klass == SystemDictionary::reflect_Field_klass()) {
141 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
142 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
143 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
144 if (!k.is_null() && k->is_instance_klass()) {
145 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
146 oop mname2 = init_field_MemberName(mname, fd);
147 if (mname2 != NULL) {
148 // Since we have the reified name and type handy, add them to the result.
149 if (java_lang_invoke_MemberName::name(mname2) == NULL)
150 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
151 if (java_lang_invoke_MemberName::type(mname2) == NULL)
152 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
153 }
154 return mname2;
155 }
156 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
157 oop clazz = java_lang_reflect_Method::clazz(target_oop);
158 int slot = java_lang_reflect_Method::slot(target_oop);
159 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
160 if (!k.is_null() && k->is_instance_klass()) {
161 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
162 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
163 return NULL; // do not resolve unless there is a concrete signature
164 CallInfo info(m, k());
165 return init_method_MemberName(mname, info);
166 }
167 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
168 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
169 int slot = java_lang_reflect_Constructor::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) return NULL;
174 CallInfo info(m, k());
175 return init_method_MemberName(mname, info);
176 }
177 }
178 return NULL;
179 }
180
181 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info, bool intern) {
182 assert(info.resolved_appendix().is_null(), "only normal methods here");
183 methodHandle m = info.resolved_method();
184 assert(m.not_null(), "null method handle");
185 KlassHandle m_klass = m->method_holder();
186 assert(m.not_null(), "null holder for method handle");
187 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
188 int vmindex = Method::invalid_vtable_index;
189
190 switch (info.call_kind()) {
191 case CallInfo::itable_call:
192 vmindex = info.itable_index();
193 // More importantly, the itable index only works with the method holder.
194 assert(m_klass->verify_itable_index(vmindex), "");
195 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
196 if (TraceInvokeDynamic) {
197 ttyLocker ttyl;
198 ResourceMark rm;
199 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
200 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
201 vmindex);
202 m->access_flags().print_on(tty);
203 if (!m->is_abstract()) {
204 tty->print("default");
205 }
206 tty->cr();
207 }
208 break;
209
210 case CallInfo::vtable_call:
211 vmindex = info.vtable_index();
212 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
213 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
214 if (m_klass->is_interface()) {
215 // This is a vtable call to an interface method (abstract "miranda method" or default method).
216 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
217 // (LinkResolver should help us figure this out.)
218 KlassHandle m_klass_non_interface = info.resolved_klass();
219 if (m_klass_non_interface->is_interface()) {
220 m_klass_non_interface = SystemDictionary::Object_klass();
221 #ifdef ASSERT
222 { ResourceMark rm;
223 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
224 assert(m->name() == m2->name() && m->signature() == m2->signature(),
225 "at %d, %s != %s", vmindex,
226 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
227 }
228 #endif //ASSERT
229 }
230 if (!m->is_public()) {
231 assert(m->is_public(), "virtual call must be to public interface method");
232 return NULL; // elicit an error later in product build
233 }
234 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
235 m_klass = m_klass_non_interface;
236 }
237 if (TraceInvokeDynamic) {
238 ttyLocker ttyl;
239 ResourceMark rm;
240 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
241 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
242 m_klass->internal_name(), vmindex);
243 m->access_flags().print_on(tty);
244 if (m->is_default_method()) {
245 tty->print("default");
246 }
247 tty->cr();
248 }
249 break;
250
251 case CallInfo::direct_call:
252 vmindex = Method::nonvirtual_vtable_index;
253 if (m->is_static()) {
254 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
255 } else if (m->is_initializer()) {
256 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
257 } else {
258 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
259 }
260 break;
261
262 default: assert(false, "bad CallInfo"); return NULL;
263 }
264
265 // @CallerSensitive annotation detected
266 if (m->caller_sensitive()) {
267 flags |= CALLER_SENSITIVE;
268 }
269
270 oop mname_oop = mname();
271 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
272 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
273 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
274 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
275 // Note: name and type can be lazily computed by resolve_MemberName,
276 // if Java code needs them as resolved String and MethodType objects.
277 // The clazz must be eagerly stored, because it provides a GC
278 // root to help keep alive the Method*.
279 // If relevant, the vtable or itable value is stored as vmindex.
280 // This is done eagerly, since it is readily available without
281 // constructing any new objects.
282 return m->method_holder()->add_member_name(mname, intern);
283 }
284
285 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
286 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
287 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
288 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
289 Metadata* vmtarget = fd.field_holder();
290 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
291 oop mname_oop = mname();
292 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
293 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
294 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
295 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
296 oop type = field_signature_type_or_null(fd.signature());
297 oop name = field_name_or_null(fd.name());
298 if (name != NULL)
299 java_lang_invoke_MemberName::set_name(mname_oop, name);
300 if (type != NULL)
301 java_lang_invoke_MemberName::set_type(mname_oop, type);
302 // Note: name and type can be lazily computed by resolve_MemberName,
303 // if Java code needs them as resolved String and Class objects.
304 // Note that the incoming type oop might be pre-resolved (non-null).
305 // The base clazz and field offset (vmindex) must be eagerly stored,
306 // because they unambiguously identify the field.
307 // Although the fieldDescriptor::_index would also identify the field,
308 // we do not use it, because it is harder to decode.
309 // TO DO: maybe intern mname_oop
310 return mname();
311 }
312
313 // JVM 2.9 Special Methods:
314 // A method is signature polymorphic if and only if all of the following conditions hold :
315 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
316 // * It has a single formal parameter of type Object[].
317 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
318 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
319 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
320 if (klass == NULL)
321 return false;
322 // The following test will fail spuriously during bootstrap of MethodHandle itself:
323 // if (klass != SystemDictionary::MethodHandle_klass())
324 // Test the name instead:
325 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
326 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
327 return false;
328 }
329
330 // Look up signature polymorphic method with polymorphic return type
331 Symbol* poly_sig = vmSymbols::object_array_object_signature();
332 InstanceKlass* iklass = InstanceKlass::cast(klass);
333 Method* m = iklass->find_method(name, poly_sig);
334 if (m != NULL) {
335 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
336 int flags = m->access_flags().as_int();
337 if ((flags & required) == required) {
338 return true;
339 }
340 }
341
342 // Look up signature polymorphic method with non-polymorphic (non Object) return type
343 int me;
344 int ms = iklass->find_method_by_name(name, &me);
345 if (ms == -1) return false;
346 for (; ms < me; ms++) {
347 Method* m = iklass->methods()->at(ms);
348 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
349 int flags = m->access_flags().as_int();
350 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
351 return true;
352 }
353 }
354 return false;
355 }
356
357
358 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
359 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
360 switch (iid) {
361 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
362 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
363 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
364 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
365 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
366 }
367 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
368 return 0;
369 }
370
371 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
372 switch(id) {
373 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
374 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
375 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
376 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
377 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
378 default:
379 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
380 return Bytecodes::_illegal;
381 }
382 }
383
384 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
385 switch (iid) {
386 case vmIntrinsics::_invokeBasic: return 0;
387 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
388 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
389 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
390 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
391 }
392 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
393 return 0;
394 }
395
396 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
397 vmSymbols::SID name_id = vmSymbols::find_sid(name);
398 switch (name_id) {
399 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
400 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
401 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
402 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
403
404 // There is one static signature-polymorphic method for each JVM invocation mode.
405 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
406 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
407 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
408 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
409 }
410
411 // Cover the case of invokeExact and any future variants of invokeFoo.
412 Klass* mh_klass = SystemDictionary::well_known_klass(
413 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
414 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
415 return vmIntrinsics::_invokeGeneric;
416 }
417
418 // Cover the case of methods on VarHandle.
419 Klass* vh_klass = SystemDictionary::well_known_klass(
420 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) );
421 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
422 return vmIntrinsics::_invokeGeneric;
423 }
424
425 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
426 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
427 return vmIntrinsics::_none;
428 }
429
430 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
431 if (klass != NULL &&
432 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
433 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
434 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
435 if (iid != vmIntrinsics::_none)
436 return iid;
437 if (is_method_handle_invoke_name(klass, name))
438 return vmIntrinsics::_invokeGeneric;
439 }
440 return vmIntrinsics::_none;
441 }
442
443
444 // convert the external string or reflective type to an internal signature
445 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
446 if (java_lang_invoke_MethodType::is_instance(type_str)) {
447 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
448 } else if (java_lang_Class::is_instance(type_str)) {
449 return java_lang_Class::as_signature(type_str, false, THREAD);
450 } else if (java_lang_String::is_instance_inlined(type_str)) {
451 if (intern_if_not_found) {
452 return java_lang_String::as_symbol(type_str, THREAD);
453 } else {
454 return java_lang_String::as_symbol_or_null(type_str);
455 }
456 } else {
457 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
458 }
459 }
460
461 static const char OBJ_SIG[] = "Ljava/lang/Object;";
462 enum { OBJ_SIG_LEN = 18 };
463
464 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
465 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
466 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
467 const int len = sig->utf8_length();
468 for (int i = 0; i < len; i++) {
469 switch (sig->byte_at(i)) {
470 case 'L':
471 // only java/lang/Object is valid here
472 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
473 return false;
474 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
475 continue;
476 case '(': case ')': case 'V':
477 case 'I': case 'J': case 'F': case 'D':
478 continue;
479 //case '[':
480 //case 'Z': case 'B': case 'C': case 'S':
481 default:
482 return false;
483 }
484 }
485 return true;
486 }
487
488 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
489 Symbol* bsig = NULL;
490 if (sig == NULL) {
491 return sig;
492 } else if (is_basic_type_signature(sig)) {
493 sig->increment_refcount();
494 return sig; // that was easy
495 } else if (sig->byte_at(0) != '(') {
496 BasicType bt = char2type(sig->byte_at(0));
497 if (is_subword_type(bt)) {
498 bsig = vmSymbols::int_signature();
499 } else {
500 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
501 bsig = vmSymbols::object_signature();
502 }
503 } else {
504 ResourceMark rm;
505 stringStream buffer(128);
506 buffer.put('(');
507 int arg_pos = 0, keep_arg_pos = -1;
508 if (keep_last_arg)
509 keep_arg_pos = ArgumentCount(sig).size() - 1;
510 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
511 BasicType bt = ss.type();
512 size_t this_arg_pos = buffer.size();
513 if (ss.at_return_type()) {
514 buffer.put(')');
515 }
516 if (arg_pos == keep_arg_pos) {
517 buffer.write((char*) ss.raw_bytes(),
518 (int) ss.raw_length());
519 } else if (bt == T_OBJECT || bt == T_ARRAY) {
520 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
521 } else {
522 if (is_subword_type(bt))
523 bt = T_INT;
524 buffer.put(type2char(bt));
525 }
526 arg_pos++;
527 }
528 const char* sigstr = buffer.base();
529 int siglen = (int) buffer.size();
530 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
531 }
532 assert(is_basic_type_signature(bsig) ||
533 // detune assert in case the injected argument is not a basic type:
534 keep_last_arg, "");
535 return bsig;
536 }
537
538 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
539 Symbol* sig,
540 bool keep_arrays,
541 bool keep_basic_names) {
542 st = st ? st : tty;
543 int len = sig->utf8_length();
544 int array = 0;
545 bool prev_type = false;
546 for (int i = 0; i < len; i++) {
547 char ch = sig->byte_at(i);
548 switch (ch) {
549 case '(': case ')':
550 prev_type = false;
551 st->put(ch);
552 continue;
553 case '[':
554 if (!keep_basic_names && keep_arrays)
555 st->put(ch);
556 array++;
557 continue;
558 case 'L':
559 {
560 if (prev_type) st->put(',');
561 int start = i+1, slash = start;
562 while (++i < len && (ch = sig->byte_at(i)) != ';') {
563 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
564 }
565 if (slash < i) start = slash;
566 if (!keep_basic_names) {
567 st->put('L');
568 } else {
569 for (int j = start; j < i; j++)
570 st->put(sig->byte_at(j));
571 prev_type = true;
572 }
573 break;
574 }
575 default:
576 {
577 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
578 ch = '[';
579 array = 0;
580 }
581 if (prev_type) st->put(',');
582 const char* n = NULL;
583 if (keep_basic_names)
584 n = type2name(char2type(ch));
585 if (n == NULL) {
586 // unknown letter, or we don't want to know its name
587 st->put(ch);
588 } else {
589 st->print("%s", n);
590 prev_type = true;
591 }
592 break;
593 }
594 }
595 // Switch break goes here to take care of array suffix:
596 if (prev_type) {
597 while (array > 0) {
598 st->print("[]");
599 --array;
600 }
601 }
602 array = 0;
603 }
604 }
605
606
607
608 static oop object_java_mirror() {
609 return SystemDictionary::Object_klass()->java_mirror();
610 }
611
612 oop MethodHandles::field_name_or_null(Symbol* s) {
613 if (s == NULL) return NULL;
614 return StringTable::lookup(s);
615 }
616
617 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
618 if (s == NULL) return NULL;
619 BasicType bt = FieldType::basic_type(s);
620 if (is_java_primitive(bt)) {
621 assert(s->utf8_length() == 1, "");
622 return java_lang_Class::primitive_mirror(bt);
623 }
624 // Here are some more short cuts for common types.
625 // They are optional, since reference types can be resolved lazily.
626 if (bt == T_OBJECT) {
627 if (s == vmSymbols::object_signature()) {
628 return object_java_mirror();
629 } else if (s == vmSymbols::class_signature()) {
630 return SystemDictionary::Class_klass()->java_mirror();
631 } else if (s == vmSymbols::string_signature()) {
632 return SystemDictionary::String_klass()->java_mirror();
633 }
634 }
635 return NULL;
636 }
637
638
639 // An unresolved member name is a mere symbolic reference.
640 // Resolving it plants a vmtarget/vmindex in it,
641 // which refers directly to JVM internals.
642 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
643 Handle empty;
644 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
645
646 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
647 // Already resolved.
648 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
649 assert(vmindex >= Method::nonvirtual_vtable_index, "");
650 return mname;
651 }
652
653 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
654 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
655 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
656 int flags = java_lang_invoke_MemberName::flags(mname());
657 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
658 if (!ref_kind_is_valid(ref_kind)) {
659 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
660 }
661
662 DEBUG_ONLY(int old_vmindex);
663 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
664
665 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
666 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
667 }
668
669 instanceKlassHandle defc;
670 {
671 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
672 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
673 if (!defc_klass->is_instance_klass()) {
674 if (!defc_klass->is_array_klass()) return empty;
675 defc_klass = SystemDictionary::Object_klass();
676 }
677 defc = instanceKlassHandle(THREAD, defc_klass);
678 }
679 if (defc.is_null()) {
680 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
681 }
682 defc->link_class(CHECK_(empty)); // possible safepoint
683
684 // convert the external string name to an internal symbol
685 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
686 if (name == NULL) return empty; // no such name
687 if (name == vmSymbols::class_initializer_name())
688 return empty; // illegal name
689
690 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
691 if ((flags & ALL_KINDS) == IS_METHOD &&
692 (defc() == SystemDictionary::MethodHandle_klass()) &&
693 (ref_kind == JVM_REF_invokeVirtual ||
694 ref_kind == JVM_REF_invokeSpecial ||
695 // static invocation mode is required for _linkToVirtual, etc.:
696 ref_kind == JVM_REF_invokeStatic)) {
697 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
698 if (iid != vmIntrinsics::_none &&
699 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
700 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
701 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
702 mh_invoke_id = iid;
703 }
704 }
705
706 // convert the external string or reflective type to an internal signature
707 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
708 if (type == NULL) return empty; // no such signature exists in the VM
709
710 LinkInfo::AccessCheck access_check = caller.not_null() ?
711 LinkInfo::needs_access_check :
712 LinkInfo::skip_access_check;
713
714 // Time to do the lookup.
715 switch (flags & ALL_KINDS) {
716 case IS_METHOD:
717 {
718 CallInfo result;
719 LinkInfo link_info(defc, name, type, caller, access_check);
720 {
721 assert(!HAS_PENDING_EXCEPTION, "");
722 if (ref_kind == JVM_REF_invokeStatic) {
723 LinkResolver::resolve_static_call(result,
724 link_info, false, THREAD);
725 } else if (ref_kind == JVM_REF_invokeInterface) {
726 LinkResolver::resolve_interface_call(result, Handle(), defc,
727 link_info, false, THREAD);
728 } else if (mh_invoke_id != vmIntrinsics::_none) {
729 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
730 LinkResolver::resolve_handle_call(result, link_info, THREAD);
731 } else if (ref_kind == JVM_REF_invokeSpecial) {
732 LinkResolver::resolve_special_call(result,
733 link_info, THREAD);
734 } else if (ref_kind == JVM_REF_invokeVirtual) {
735 LinkResolver::resolve_virtual_call(result, Handle(), defc,
736 link_info, false, THREAD);
737 } else {
738 assert(false, "ref_kind=%d", ref_kind);
739 }
740 if (HAS_PENDING_EXCEPTION) {
741 return empty;
742 }
743 }
744 if (result.resolved_appendix().not_null()) {
745 // The resolved MemberName must not be accompanied by an appendix argument,
746 // since there is no way to bind this value into the MemberName.
747 // Caller is responsible to prevent this from happening.
748 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
749 }
750 oop mname2 = init_method_MemberName(mname, result);
751 return Handle(THREAD, mname2);
752 }
753 case IS_CONSTRUCTOR:
754 {
755 CallInfo result;
756 LinkInfo link_info(defc, name, type, caller, access_check);
757 {
758 assert(!HAS_PENDING_EXCEPTION, "");
759 if (name == vmSymbols::object_initializer_name()) {
760 LinkResolver::resolve_special_call(result, link_info, THREAD);
761 } else {
762 break; // will throw after end of switch
763 }
764 if (HAS_PENDING_EXCEPTION) {
765 return empty;
766 }
767 }
768 assert(result.is_statically_bound(), "");
769 oop mname2 = init_method_MemberName(mname, result);
770 return Handle(THREAD, mname2);
771 }
772 case IS_FIELD:
773 {
774 fieldDescriptor result; // find_field initializes fd if found
775 {
776 assert(!HAS_PENDING_EXCEPTION, "");
777 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
778 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
779 if (HAS_PENDING_EXCEPTION) {
780 return empty;
781 }
782 }
783 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
784 return Handle(THREAD, mname2);
785 }
786 default:
787 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
788 }
789
790 return empty;
791 }
792
793 // Conversely, a member name which is only initialized from JVM internals
794 // may have null defc, name, and type fields.
795 // Resolving it plants a vmtarget/vmindex in it,
796 // which refers directly to JVM internals.
797 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
798 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
799 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
800 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
801 if (vmtarget == NULL) {
802 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
803 }
804
805 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
806 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
807 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
808 int flags = java_lang_invoke_MemberName::flags(mname());
809
810 if (suppress != 0) {
811 if (suppress & _suppress_defc) have_defc = true;
812 if (suppress & _suppress_name) have_name = true;
813 if (suppress & _suppress_type) have_type = true;
814 }
815
816 if (have_defc && have_name && have_type) return; // nothing needed
817
818 switch (flags & ALL_KINDS) {
819 case IS_METHOD:
820 case IS_CONSTRUCTOR:
821 {
822 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
823 methodHandle m(THREAD, (Method*)vmtarget);
824 DEBUG_ONLY(vmtarget = NULL); // safety
825 if (m.is_null()) break;
826 if (!have_defc) {
827 InstanceKlass* defc = m->method_holder();
828 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
829 }
830 if (!have_name) {
831 //not java_lang_String::create_from_symbol; let's intern member names
832 Handle name = StringTable::intern(m->name(), CHECK);
833 java_lang_invoke_MemberName::set_name(mname(), name());
834 }
835 if (!have_type) {
836 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
837 java_lang_invoke_MemberName::set_type(mname(), type());
838 }
839 return;
840 }
841 case IS_FIELD:
842 {
843 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
844 if (!((Klass*) vmtarget)->is_instance_klass()) break;
845 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
846 DEBUG_ONLY(vmtarget = NULL); // safety
847 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
848 fieldDescriptor fd; // find_field initializes fd if found
849 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
850 break; // cannot expand
851 if (!have_defc) {
852 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
853 }
854 if (!have_name) {
855 //not java_lang_String::create_from_symbol; let's intern member names
856 Handle name = StringTable::intern(fd.name(), CHECK);
857 java_lang_invoke_MemberName::set_name(mname(), name());
858 }
859 if (!have_type) {
860 // If it is a primitive field type, don't mess with short strings like "I".
861 Handle type = field_signature_type_or_null(fd.signature());
862 if (type.is_null()) {
863 java_lang_String::create_from_symbol(fd.signature(), CHECK);
864 }
865 java_lang_invoke_MemberName::set_type(mname(), type());
866 }
867 return;
868 }
869 }
870 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
871 }
872
873 int MethodHandles::find_MemberNames(KlassHandle k,
874 Symbol* name, Symbol* sig,
875 int mflags, KlassHandle caller,
876 int skip, objArrayHandle results) {
877 // %%% take caller into account!
878
879 Thread* thread = Thread::current();
880
881 if (k.is_null() || !k->is_instance_klass()) return -1;
882
883 int rfill = 0, rlimit = results->length(), rskip = skip;
884 // overflow measurement:
885 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
886
887 int match_flags = mflags;
888 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
889 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
890 bool local_only = !(search_superc | search_intfc);
891 bool classes_only = false;
892
893 if (name != NULL) {
894 if (name->utf8_length() == 0) return 0; // a match is not possible
895 }
896 if (sig != NULL) {
897 if (sig->utf8_length() == 0) return 0; // a match is not possible
898 if (sig->byte_at(0) == '(')
899 match_flags &= ~(IS_FIELD | IS_TYPE);
900 else
901 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
902 }
903
904 if ((match_flags & IS_TYPE) != 0) {
905 // NYI, and Core Reflection works quite well for this query
906 }
907
908 if ((match_flags & IS_FIELD) != 0) {
909 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
910 if (name != NULL && st.name() != name)
911 continue;
912 if (sig != NULL && st.signature() != sig)
913 continue;
914 // passed the filters
915 if (rskip > 0) {
916 --rskip;
917 } else if (rfill < rlimit) {
918 Handle result(thread, results->obj_at(rfill++));
919 if (!java_lang_invoke_MemberName::is_instance(result()))
920 return -99; // caller bug!
921 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
922 if (saved != result())
923 results->obj_at_put(rfill-1, saved); // show saved instance to user
924 } else if (++overflow >= overflow_limit) {
925 match_flags = 0; break; // got tired of looking at overflow
926 }
927 }
928 }
929
930 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
931 // watch out for these guys:
932 Symbol* init_name = vmSymbols::object_initializer_name();
933 Symbol* clinit_name = vmSymbols::class_initializer_name();
934 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
935 bool negate_name_test = false;
936 // fix name so that it captures the intention of IS_CONSTRUCTOR
937 if (!(match_flags & IS_METHOD)) {
938 // constructors only
939 if (name == NULL) {
940 name = init_name;
941 } else if (name != init_name) {
942 return 0; // no constructors of this method name
943 }
944 } else if (!(match_flags & IS_CONSTRUCTOR)) {
945 // methods only
946 if (name == NULL) {
947 name = init_name;
948 negate_name_test = true; // if we see the name, we *omit* the entry
949 } else if (name == init_name) {
950 return 0; // no methods of this constructor name
951 }
952 } else {
953 // caller will accept either sort; no need to adjust name
954 }
955 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
956 Method* m = st.method();
957 Symbol* m_name = m->name();
958 if (m_name == clinit_name)
959 continue;
960 if (name != NULL && ((m_name != name) ^ negate_name_test))
961 continue;
962 if (sig != NULL && m->signature() != sig)
963 continue;
964 // passed the filters
965 if (rskip > 0) {
966 --rskip;
967 } else if (rfill < rlimit) {
968 Handle result(thread, results->obj_at(rfill++));
969 if (!java_lang_invoke_MemberName::is_instance(result()))
970 return -99; // caller bug!
971 CallInfo info(m);
972 // Since this is going through the methods to create MemberNames, don't search
973 // for matching methods already in the table
974 oop saved = MethodHandles::init_method_MemberName(result, info, /*intern*/false);
975 if (saved != result())
976 results->obj_at_put(rfill-1, saved); // show saved instance to user
977 } else if (++overflow >= overflow_limit) {
978 match_flags = 0; break; // got tired of looking at overflow
979 }
980 }
981 }
982
983 // return number of elements we at leasted wanted to initialize
984 return rfill + overflow;
985 }
986
987 // Is it safe to remove stale entries from a dependency list?
988 static bool safe_to_expunge() {
989 // Since parallel GC threads can concurrently iterate over a dependency
990 // list during safepoint, it is safe to remove entries only when
991 // CodeCache lock is held.
992 return CodeCache_lock->owned_by_self();
993 }
994
995 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
996 assert_locked_or_safepoint(CodeCache_lock);
997
998 oop context = java_lang_invoke_CallSite::context(call_site);
999 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1000 // Try to purge stale entries on updates.
1001 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
1002 // in order to avoid memory leak, stale entries are purged whenever a dependency list
1003 // is changed (both on addition and removal). Though memory reclamation is delayed,
1004 // it avoids indefinite memory usage growth.
1005 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
1006 }
1007
1008 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
1009 assert_locked_or_safepoint(CodeCache_lock);
1010
1011 oop context = java_lang_invoke_CallSite::context(call_site);
1012 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1013 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
1014 }
1015
1016 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
1017 assert_lock_strong(Compile_lock);
1018
1019 int marked = 0;
1020 CallSiteDepChange changes(call_site(), target());
1021 {
1022 NoSafepointVerifier nsv;
1023 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1024
1025 oop context = java_lang_invoke_CallSite::context(call_site());
1026 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1027 marked = deps.mark_dependent_nmethods(changes);
1028 }
1029 if (marked > 0) {
1030 // At least one nmethod has been marked for deoptimization.
1031 VM_Deoptimize op;
1032 VMThread::execute(&op);
1033 }
1034 }
1035
1036 //------------------------------------------------------------------------------
1037 // MemberNameTable
1038 //
1039
1040 MemberNameTable::MemberNameTable(int methods_cnt)
1041 : GrowableArray<jweak>(methods_cnt, true) {
1042 assert_locked_or_safepoint(MemberNameTable_lock);
1043 }
1044
1045 MemberNameTable::~MemberNameTable() {
1046 assert_locked_or_safepoint(MemberNameTable_lock);
1047 int len = this->length();
1048
1049 for (int idx = 0; idx < len; idx++) {
1050 jweak ref = this->at(idx);
1051 JNIHandles::destroy_weak_global(ref);
1052 }
1053 }
1054
1055 oop MemberNameTable::add_member_name(jweak mem_name_wref) {
1056 assert_locked_or_safepoint(MemberNameTable_lock);
1057 this->push(mem_name_wref);
1058 return JNIHandles::resolve(mem_name_wref);
1059 }
1060
1061 oop MemberNameTable::find_or_add_member_name(jweak mem_name_wref) {
1062 assert_locked_or_safepoint(MemberNameTable_lock);
1063 oop new_mem_name = JNIHandles::resolve(mem_name_wref);
1064
1065 // Find matching member name in the list.
1066 // This is linear because these because these are short lists.
1067 int len = this->length();
1068 int new_index = len;
1069 for (int idx = 0; idx < len; idx++) {
1070 oop mname = JNIHandles::resolve(this->at(idx));
1071 if (mname == NULL) {
1072 new_index = idx;
1073 continue;
1074 }
1075 if (java_lang_invoke_MemberName::equals(new_mem_name, mname)) {
1076 JNIHandles::destroy_weak_global(mem_name_wref);
1077 return mname;
1078 }
1079 }
1080 // Not found, push the new one, or reuse empty slot
1081 this->at_put_grow(new_index, mem_name_wref);
1082 return new_mem_name;
1083 }
1084
1085 #if INCLUDE_JVMTI
1086 // It is called at safepoint only for RedefineClasses
1087 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) {
1088 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
1089 // For each redefined method
1090 for (int idx = 0; idx < length(); idx++) {
1091 oop mem_name = JNIHandles::resolve(this->at(idx));
1092 if (mem_name == NULL) {
1093 continue;
1094 }
1095 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
1096
1097 if (old_method == NULL || !old_method->is_old()) {
1098 continue; // skip uninteresting entries
1099 }
1100 if (old_method->is_deleted()) {
1101 // skip entries with deleted methods
1102 continue;
1103 }
1104 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum());
1105
1106 assert(new_method != NULL, "method_with_idnum() should not be NULL");
1107 assert(old_method != new_method, "sanity check");
1108
1109 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method);
1110
1111 if (log_is_enabled(Info, redefine, class, update)) {
1112 ResourceMark rm;
1113 if (!(*trace_name_printed)) {
1114 log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name());
1115 *trace_name_printed = true;
1116 }
1117 log_debug(redefine, class, update, constantpool)
1118 ("MemberName method update: %s(%s)",
1119 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
1120 }
1121 }
1122 }
1123 #endif // INCLUDE_JVMTI
1124
1125 //
1126 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1127 // They are the private interface between this JVM and the HotSpot-specific
1128 // Java code that implements JSR 292 method handles.
1129 //
1130 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1131 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1132 //
1133
1134 #ifndef PRODUCT
1135 #define EACH_NAMED_CON(template, requirement) \
1136 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1137 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1138 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1139 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1140 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1141 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1142 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1143 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1144 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1145 /*end*/
1146
1147 #define IGNORE_REQ(req_expr) /* req_expr */
1148 #define ONE_PLUS(scope,value) 1+
1149 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1150 #define VALUE_COMMA(scope,value) scope::value,
1151 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1152 #define STRING_NULL(scope,value) #value "\0"
1153 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1154
1155 static bool advertise_con_value(int which) {
1156 if (which < 0) return false;
1157 bool ok = true;
1158 int count = 0;
1159 #define INC_COUNT(scope,value) \
1160 ++count;
1161 #define CHECK_REQ(req_expr) \
1162 if (which < count) return ok; \
1163 ok = (req_expr);
1164 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1165 #undef INC_COUNT
1166 #undef CHECK_REQ
1167 assert(count == con_value_count, "");
1168 if (which < count) return ok;
1169 return false;
1170 }
1171
1172 #undef ONE_PLUS
1173 #undef VALUE_COMMA
1174 #undef STRING_NULL
1175 #undef EACH_NAMED_CON
1176 #endif // PRODUCT
1177
1178 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1179 #ifndef PRODUCT
1180 if (advertise_con_value(which)) {
1181 assert(which >= 0 && which < con_value_count, "");
1182 int con = con_values[which];
1183 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1184 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1185 const char* str = &con_names[0];
1186 for (int i = 0; i < which; i++)
1187 str += strlen(str) + 1; // skip name and null
1188 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1189 box->obj_at_put(0, name);
1190 }
1191 return con;
1192 }
1193 #endif
1194 return 0;
1195 }
1196 JVM_END
1197
1198 // void init(MemberName self, AccessibleObject ref)
1199 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1200 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1201 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1202 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1203 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1204 MethodHandles::init_MemberName(mname, target);
1205 }
1206 JVM_END
1207
1208 // void expand(MemberName self)
1209 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1210 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1211 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1212 MethodHandles::expand_MemberName(mname, 0, CHECK);
1213 }
1214 JVM_END
1215
1216 // void resolve(MemberName self, Class<?> caller)
1217 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1218 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1219 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1220
1221 // The trusted Java code that calls this method should already have performed
1222 // access checks on behalf of the given caller. But, we can verify this.
1223 if (VerifyMethodHandles && caller_jh != NULL &&
1224 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1225 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1226 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1227 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1228 }
1229
1230 // Reflection::verify_class_access can only handle instance classes.
1231 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1232 // Emulate LinkResolver::check_klass_accessability.
1233 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1234 if (Reflection::verify_class_access(caller,
1235 reference_klass,
1236 true) != Reflection::ACCESS_OK) {
1237 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1238 }
1239 }
1240 }
1241
1242 KlassHandle caller(THREAD,
1243 caller_jh == NULL ? (Klass*) NULL :
1244 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1245 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1246
1247 if (resolved.is_null()) {
1248 int flags = java_lang_invoke_MemberName::flags(mname());
1249 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1250 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1251 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1252 }
1253 if ((flags & ALL_KINDS) == IS_FIELD) {
1254 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1255 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1256 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1257 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1258 } else {
1259 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1260 }
1261 }
1262
1263 return JNIHandles::make_local(THREAD, resolved());
1264 }
1265 JVM_END
1266
1267 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1268 if (mname == NULL ||
1269 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1270 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1271 } else {
1272 int flags = java_lang_invoke_MemberName::flags(mname);
1273 if ((flags & IS_FIELD) != 0 &&
1274 (must_be_static
1275 ? (flags & JVM_ACC_STATIC) != 0
1276 : (flags & JVM_ACC_STATIC) == 0)) {
1277 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1278 return (jlong) vmindex;
1279 }
1280 }
1281 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1282 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1283 return 0;
1284 }
1285
1286 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1287 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1288 }
1289 JVM_END
1290
1291 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1292 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1293 }
1294 JVM_END
1295
1296 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1297 // use the other function to perform sanity checks:
1298 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1299 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1300 return JNIHandles::make_local(THREAD, clazz);
1301 }
1302 JVM_END
1303
1304 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1305 if (mname_jh == NULL) return NULL;
1306 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1307 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1308 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1309 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1310 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1311 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1312 result->obj_at_put(0, x);
1313 x = NULL;
1314 if (vmtarget == NULL) {
1315 x = NULL;
1316 } else if (vmtarget->is_klass()) {
1317 x = ((Klass*) vmtarget)->java_mirror();
1318 } else if (vmtarget->is_method()) {
1319 x = mname();
1320 }
1321 result->obj_at_put(1, x);
1322 return JNIHandles::make_local(env, result());
1323 }
1324 JVM_END
1325
1326
1327
1328 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1329 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1330 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1331 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1332 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1333 if (clazz_jh == NULL || results_jh == NULL) return -1;
1334 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1335
1336 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1337 if (results.is_null() || !results->is_objArray()) return -1;
1338
1339 TempNewSymbol name = NULL;
1340 TempNewSymbol sig = NULL;
1341 if (name_jh != NULL) {
1342 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1343 if (name == NULL) return 0; // a match is not possible
1344 }
1345 if (sig_jh != NULL) {
1346 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1347 if (sig == NULL) return 0; // a match is not possible
1348 }
1349
1350 KlassHandle caller;
1351 if (caller_jh != NULL) {
1352 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1353 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1354 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1355 }
1356
1357 if (name != NULL && sig != NULL && results.not_null()) {
1358 // try a direct resolve
1359 // %%% TO DO
1360 }
1361
1362 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1363 caller, skip, results);
1364 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1365 return res;
1366 }
1367 JVM_END
1368
1369 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1370 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1371 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1372 {
1373 // Walk all nmethods depending on this call site.
1374 MutexLocker mu(Compile_lock, thread);
1375 MethodHandles::flush_dependent_nmethods(call_site, target);
1376 java_lang_invoke_CallSite::set_target(call_site(), target());
1377 }
1378 }
1379 JVM_END
1380
1381 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1382 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1383 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1384 {
1385 // Walk all nmethods depending on this call site.
1386 MutexLocker mu(Compile_lock, thread);
1387 MethodHandles::flush_dependent_nmethods(call_site, target);
1388 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1389 }
1390 }
1391 JVM_END
1392
1393 // It is called by a Cleaner object which ensures that dropped CallSites properly
1394 // deallocate their dependency information.
1395 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1396 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1397 {
1398 // Walk all nmethods depending on this call site.
1399 MutexLocker mu1(Compile_lock, thread);
1400
1401 int marked = 0;
1402 {
1403 NoSafepointVerifier nsv;
1404 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1405 assert(safe_to_expunge(), "removal is not safe");
1406 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1407 marked = deps.remove_all_dependents();
1408 }
1409 if (marked > 0) {
1410 // At least one nmethod has been marked for deoptimization
1411 VM_Deoptimize op;
1412 VMThread::execute(&op);
1413 }
1414 }
1415 }
1416 JVM_END
1417
1418 /**
1419 * Throws a java/lang/UnsupportedOperationException unconditionally.
1420 * This is required by the specification of MethodHandle.invoke if
1421 * invoked directly.
1422 */
1423 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1424 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1425 return NULL;
1426 }
1427 JVM_END
1428
1429 /**
1430 * Throws a java/lang/UnsupportedOperationException unconditionally.
1431 * This is required by the specification of MethodHandle.invokeExact if
1432 * invoked directly.
1433 */
1434 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1435 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1436 return NULL;
1437 }
1438 JVM_END
1439
1440 /// JVM_RegisterMethodHandleMethods
1441
1442 #undef CS // Solaris builds complain
1443
1444 #define LANG "Ljava/lang/"
1445 #define JLINV "Ljava/lang/invoke/"
1446
1447 #define OBJ LANG "Object;"
1448 #define CLS LANG "Class;"
1449 #define STRG LANG "String;"
1450 #define CS JLINV "CallSite;"
1451 #define MT JLINV "MethodType;"
1452 #define MH JLINV "MethodHandle;"
1453 #define MEM JLINV "MemberName;"
1454 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1455
1456 #define CC (char*) /*cast a literal from (const char*)*/
1457 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1458
1459 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1460 static JNINativeMethod MHN_methods[] = {
1461 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1462 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1463 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)},
1464 // static native int getNamedCon(int which, Object[] name)
1465 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1466 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1467 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1468 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1469 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1470 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1471 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1472 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1473 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1474 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1475 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1476 };
1477
1478 static JNINativeMethod MH_methods[] = {
1479 // UnsupportedOperationException throwers
1480 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1481 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1482 };
1483
1484 /**
1485 * This one function is exported, used by NativeLookup.
1486 */
1487 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1488 assert(!MethodHandles::enabled(), "must not be enabled");
1489 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1490
1491 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1492 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1493
1494 {
1495 ThreadToNativeFromVM ttnfv(thread);
1496
1497 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1498 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1499 "register java.lang.invoke.MethodHandleNative natives");
1500
1501 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1502 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1503 "register java.lang.invoke.MethodHandle natives");
1504 }
1505
1506 if (TraceInvokeDynamic) {
1507 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1508 }
1509
1510 MethodHandles::set_enabled(true);
1511 }
1512 JVM_END