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) {
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 // TO DO: maybe intern mname_oop
283 if (m->method_holder()->add_member_name(mname)) {
284 return mname();
285 } else {
286 // Redefinition caused this to fail. Return NULL (and an exception?)
287 return NULL;
288 }
289 }
290
291 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
292 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
293 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
294 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
295 Metadata* vmtarget = fd.field_holder();
296 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
297 oop mname_oop = mname();
298 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
299 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
300 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
301 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
302 oop type = field_signature_type_or_null(fd.signature());
303 oop name = field_name_or_null(fd.name());
304 if (name != NULL)
305 java_lang_invoke_MemberName::set_name(mname_oop, name);
306 if (type != NULL)
307 java_lang_invoke_MemberName::set_type(mname_oop, type);
308 // Note: name and type can be lazily computed by resolve_MemberName,
309 // if Java code needs them as resolved String and Class objects.
310 // Note that the incoming type oop might be pre-resolved (non-null).
311 // The base clazz and field offset (vmindex) must be eagerly stored,
312 // because they unambiguously identify the field.
313 // Although the fieldDescriptor::_index would also identify the field,
314 // we do not use it, because it is harder to decode.
315 // TO DO: maybe intern mname_oop
316 return mname();
317 }
318
319 // JVM 2.9 Special Methods:
320 // A method is signature polymorphic if and only if all of the following conditions hold :
321 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
322 // * It has a single formal parameter of type Object[].
323 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
324 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
325 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
326 if (klass == NULL)
327 return false;
328 // The following test will fail spuriously during bootstrap of MethodHandle itself:
329 // if (klass != SystemDictionary::MethodHandle_klass())
330 // Test the name instead:
331 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
332 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
333 return false;
334 }
335
336 // Look up signature polymorphic method with polymorphic return type
337 Symbol* poly_sig = vmSymbols::object_array_object_signature();
338 InstanceKlass* iklass = InstanceKlass::cast(klass);
339 Method* m = iklass->find_method(name, poly_sig);
340 if (m != NULL) {
341 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
342 int flags = m->access_flags().as_int();
343 if ((flags & required) == required) {
344 return true;
345 }
346 }
347
348 // Look up signature polymorphic method with non-polymorphic (non Object) return type
349 int me;
350 int ms = iklass->find_method_by_name(name, &me);
351 if (ms == -1) return false;
352 for (; ms < me; ms++) {
353 Method* m = iklass->methods()->at(ms);
354 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
355 int flags = m->access_flags().as_int();
356 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
357 return true;
358 }
359 }
360 return false;
361 }
362
363
364 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
365 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
366 switch (iid) {
367 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
368 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
369 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
370 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
371 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
372 }
373 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
374 return 0;
375 }
376
377 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
378 switch(id) {
379 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
380 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
381 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
382 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
383 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
384 default:
385 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
386 return Bytecodes::_illegal;
387 }
388 }
389
390 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
391 switch (iid) {
392 case vmIntrinsics::_invokeBasic: return 0;
393 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
394 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
395 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
396 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
397 }
398 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
399 return 0;
400 }
401
402 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
403 vmSymbols::SID name_id = vmSymbols::find_sid(name);
404 switch (name_id) {
405 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
406 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
407 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
408 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
409
410 // There is one static signature-polymorphic method for each JVM invocation mode.
411 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
412 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
413 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
414 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
415 }
416
417 // Cover the case of invokeExact and any future variants of invokeFoo.
418 Klass* mh_klass = SystemDictionary::well_known_klass(
419 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
420 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
421 return vmIntrinsics::_invokeGeneric;
422 }
423
424 // Cover the case of methods on VarHandle.
425 Klass* vh_klass = SystemDictionary::well_known_klass(
426 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) );
427 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
428 return vmIntrinsics::_invokeGeneric;
429 }
430
431 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
432 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
433 return vmIntrinsics::_none;
434 }
435
436 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
437 if (klass != NULL &&
438 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
439 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
440 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
441 if (iid != vmIntrinsics::_none)
442 return iid;
443 if (is_method_handle_invoke_name(klass, name))
444 return vmIntrinsics::_invokeGeneric;
445 }
446 return vmIntrinsics::_none;
447 }
448
449
450 // convert the external string or reflective type to an internal signature
451 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
452 if (java_lang_invoke_MethodType::is_instance(type_str)) {
453 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
454 } else if (java_lang_Class::is_instance(type_str)) {
455 return java_lang_Class::as_signature(type_str, false, THREAD);
456 } else if (java_lang_String::is_instance_inlined(type_str)) {
457 if (intern_if_not_found) {
458 return java_lang_String::as_symbol(type_str, THREAD);
459 } else {
460 return java_lang_String::as_symbol_or_null(type_str);
461 }
462 } else {
463 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
464 }
465 }
466
467 static const char OBJ_SIG[] = "Ljava/lang/Object;";
468 enum { OBJ_SIG_LEN = 18 };
469
470 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
471 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
472 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
473 const int len = sig->utf8_length();
474 for (int i = 0; i < len; i++) {
475 switch (sig->byte_at(i)) {
476 case 'L':
477 // only java/lang/Object is valid here
478 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
479 return false;
480 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
481 continue;
482 case '(': case ')': case 'V':
483 case 'I': case 'J': case 'F': case 'D':
484 continue;
485 //case '[':
486 //case 'Z': case 'B': case 'C': case 'S':
487 default:
488 return false;
489 }
490 }
491 return true;
492 }
493
494 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
495 Symbol* bsig = NULL;
496 if (sig == NULL) {
497 return sig;
498 } else if (is_basic_type_signature(sig)) {
499 sig->increment_refcount();
500 return sig; // that was easy
501 } else if (sig->byte_at(0) != '(') {
502 BasicType bt = char2type(sig->byte_at(0));
503 if (is_subword_type(bt)) {
504 bsig = vmSymbols::int_signature();
505 } else {
506 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
507 bsig = vmSymbols::object_signature();
508 }
509 } else {
510 ResourceMark rm;
511 stringStream buffer(128);
512 buffer.put('(');
513 int arg_pos = 0, keep_arg_pos = -1;
514 if (keep_last_arg)
515 keep_arg_pos = ArgumentCount(sig).size() - 1;
516 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
517 BasicType bt = ss.type();
518 size_t this_arg_pos = buffer.size();
519 if (ss.at_return_type()) {
520 buffer.put(')');
521 }
522 if (arg_pos == keep_arg_pos) {
523 buffer.write((char*) ss.raw_bytes(),
524 (int) ss.raw_length());
525 } else if (bt == T_OBJECT || bt == T_ARRAY) {
526 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
527 } else {
528 if (is_subword_type(bt))
529 bt = T_INT;
530 buffer.put(type2char(bt));
531 }
532 arg_pos++;
533 }
534 const char* sigstr = buffer.base();
535 int siglen = (int) buffer.size();
536 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
537 }
538 assert(is_basic_type_signature(bsig) ||
539 // detune assert in case the injected argument is not a basic type:
540 keep_last_arg, "");
541 return bsig;
542 }
543
544 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
545 Symbol* sig,
546 bool keep_arrays,
547 bool keep_basic_names) {
548 st = st ? st : tty;
549 int len = sig->utf8_length();
550 int array = 0;
551 bool prev_type = false;
552 for (int i = 0; i < len; i++) {
553 char ch = sig->byte_at(i);
554 switch (ch) {
555 case '(': case ')':
556 prev_type = false;
557 st->put(ch);
558 continue;
559 case '[':
560 if (!keep_basic_names && keep_arrays)
561 st->put(ch);
562 array++;
563 continue;
564 case 'L':
565 {
566 if (prev_type) st->put(',');
567 int start = i+1, slash = start;
568 while (++i < len && (ch = sig->byte_at(i)) != ';') {
569 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
570 }
571 if (slash < i) start = slash;
572 if (!keep_basic_names) {
573 st->put('L');
574 } else {
575 for (int j = start; j < i; j++)
576 st->put(sig->byte_at(j));
577 prev_type = true;
578 }
579 break;
580 }
581 default:
582 {
583 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
584 ch = '[';
585 array = 0;
586 }
587 if (prev_type) st->put(',');
588 const char* n = NULL;
589 if (keep_basic_names)
590 n = type2name(char2type(ch));
591 if (n == NULL) {
592 // unknown letter, or we don't want to know its name
593 st->put(ch);
594 } else {
595 st->print("%s", n);
596 prev_type = true;
597 }
598 break;
599 }
600 }
601 // Switch break goes here to take care of array suffix:
602 if (prev_type) {
603 while (array > 0) {
604 st->print("[]");
605 --array;
606 }
607 }
608 array = 0;
609 }
610 }
611
612
613
614 static oop object_java_mirror() {
615 return SystemDictionary::Object_klass()->java_mirror();
616 }
617
618 oop MethodHandles::field_name_or_null(Symbol* s) {
619 if (s == NULL) return NULL;
620 return StringTable::lookup(s);
621 }
622
623 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
624 if (s == NULL) return NULL;
625 BasicType bt = FieldType::basic_type(s);
626 if (is_java_primitive(bt)) {
627 assert(s->utf8_length() == 1, "");
628 return java_lang_Class::primitive_mirror(bt);
629 }
630 // Here are some more short cuts for common types.
631 // They are optional, since reference types can be resolved lazily.
632 if (bt == T_OBJECT) {
633 if (s == vmSymbols::object_signature()) {
634 return object_java_mirror();
635 } else if (s == vmSymbols::class_signature()) {
636 return SystemDictionary::Class_klass()->java_mirror();
637 } else if (s == vmSymbols::string_signature()) {
638 return SystemDictionary::String_klass()->java_mirror();
639 }
640 }
641 return NULL;
642 }
643
644
645 // An unresolved member name is a mere symbolic reference.
646 // Resolving it plants a vmtarget/vmindex in it,
647 // which refers directly to JVM internals.
648 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
649 Handle empty;
650 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
651
652 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
653 // Already resolved.
654 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
655 assert(vmindex >= Method::nonvirtual_vtable_index, "");
656 return mname;
657 }
658
659 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
660 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
661 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
662 int flags = java_lang_invoke_MemberName::flags(mname());
663 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
664 if (!ref_kind_is_valid(ref_kind)) {
665 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
666 }
667
668 DEBUG_ONLY(int old_vmindex);
669 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
670
671 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
672 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
673 }
674
675 instanceKlassHandle defc;
676 {
677 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
678 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
679 if (!defc_klass->is_instance_klass()) {
680 if (!defc_klass->is_array_klass()) return empty;
681 defc_klass = SystemDictionary::Object_klass();
682 }
683 defc = instanceKlassHandle(THREAD, defc_klass);
684 }
685 if (defc.is_null()) {
686 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
687 }
688 defc->link_class(CHECK_(empty)); // possible safepoint
689
690 // convert the external string name to an internal symbol
691 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
692 if (name == NULL) return empty; // no such name
693 if (name == vmSymbols::class_initializer_name())
694 return empty; // illegal name
695
696 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
697 if ((flags & ALL_KINDS) == IS_METHOD &&
698 (defc() == SystemDictionary::MethodHandle_klass()) &&
699 (ref_kind == JVM_REF_invokeVirtual ||
700 ref_kind == JVM_REF_invokeSpecial ||
701 // static invocation mode is required for _linkToVirtual, etc.:
702 ref_kind == JVM_REF_invokeStatic)) {
703 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
704 if (iid != vmIntrinsics::_none &&
705 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
706 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
707 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
708 mh_invoke_id = iid;
709 }
710 }
711
712 // convert the external string or reflective type to an internal signature
713 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
714 if (type == NULL) return empty; // no such signature exists in the VM
715
716 // Time to do the lookup.
717 switch (flags & ALL_KINDS) {
718 case IS_METHOD:
719 {
720 CallInfo result;
721 LinkInfo link_info(defc, name, type, caller, caller.not_null());
722 {
723 assert(!HAS_PENDING_EXCEPTION, "");
724 if (ref_kind == JVM_REF_invokeStatic) {
725 LinkResolver::resolve_static_call(result,
726 link_info, false, THREAD);
727 } else if (ref_kind == JVM_REF_invokeInterface) {
728 LinkResolver::resolve_interface_call(result, Handle(), defc,
729 link_info, false, THREAD);
730 } else if (mh_invoke_id != vmIntrinsics::_none) {
731 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
732 LinkResolver::resolve_handle_call(result, link_info, THREAD);
733 } else if (ref_kind == JVM_REF_invokeSpecial) {
734 LinkResolver::resolve_special_call(result,
735 link_info, THREAD);
736 } else if (ref_kind == JVM_REF_invokeVirtual) {
737 LinkResolver::resolve_virtual_call(result, Handle(), defc,
738 link_info, false, THREAD);
739 } else {
740 assert(false, "ref_kind=%d", ref_kind);
741 }
742 if (HAS_PENDING_EXCEPTION) {
743 return empty;
744 }
745 }
746 if (result.resolved_appendix().not_null()) {
747 // The resolved MemberName must not be accompanied by an appendix argument,
748 // since there is no way to bind this value into the MemberName.
749 // Caller is responsible to prevent this from happening.
750 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
751 }
752 oop mname2 = init_method_MemberName(mname, result);
753 return Handle(THREAD, mname2);
754 }
755 case IS_CONSTRUCTOR:
756 {
757 CallInfo result;
758 LinkInfo link_info(defc, name, type, caller, caller.not_null());
759 {
760 assert(!HAS_PENDING_EXCEPTION, "");
761 if (name == vmSymbols::object_initializer_name()) {
762 LinkResolver::resolve_special_call(result, link_info, THREAD);
763 } else {
764 break; // will throw after end of switch
765 }
766 if (HAS_PENDING_EXCEPTION) {
767 return empty;
768 }
769 }
770 assert(result.is_statically_bound(), "");
771 oop mname2 = init_method_MemberName(mname, result);
772 return Handle(THREAD, mname2);
773 }
774 case IS_FIELD:
775 {
776 fieldDescriptor result; // find_field initializes fd if found
777 {
778 assert(!HAS_PENDING_EXCEPTION, "");
779 LinkInfo link_info(defc, name, type, caller, /*check_access*/false);
780 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
781 if (HAS_PENDING_EXCEPTION) {
782 return empty;
783 }
784 }
785 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
786 return Handle(THREAD, mname2);
787 }
788 default:
789 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
790 }
791
792 return empty;
793 }
794
795 // Conversely, a member name which is only initialized from JVM internals
796 // may have null defc, name, and type fields.
797 // Resolving it plants a vmtarget/vmindex in it,
798 // which refers directly to JVM internals.
799 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
800 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
801 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
802 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
803 if (vmtarget == NULL) {
804 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
805 }
806
807 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
808 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
809 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
810 int flags = java_lang_invoke_MemberName::flags(mname());
811
812 if (suppress != 0) {
813 if (suppress & _suppress_defc) have_defc = true;
814 if (suppress & _suppress_name) have_name = true;
815 if (suppress & _suppress_type) have_type = true;
816 }
817
818 if (have_defc && have_name && have_type) return; // nothing needed
819
820 switch (flags & ALL_KINDS) {
821 case IS_METHOD:
822 case IS_CONSTRUCTOR:
823 {
824 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
825 methodHandle m(THREAD, (Method*)vmtarget);
826 DEBUG_ONLY(vmtarget = NULL); // safety
827 if (m.is_null()) break;
828 if (!have_defc) {
829 InstanceKlass* defc = m->method_holder();
830 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
831 }
832 if (!have_name) {
833 //not java_lang_String::create_from_symbol; let's intern member names
834 Handle name = StringTable::intern(m->name(), CHECK);
835 java_lang_invoke_MemberName::set_name(mname(), name());
836 }
837 if (!have_type) {
838 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
839 java_lang_invoke_MemberName::set_type(mname(), type());
840 }
841 return;
842 }
843 case IS_FIELD:
844 {
845 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
846 if (!((Klass*) vmtarget)->is_instance_klass()) break;
847 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
848 DEBUG_ONLY(vmtarget = NULL); // safety
849 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
850 fieldDescriptor fd; // find_field initializes fd if found
851 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
852 break; // cannot expand
853 if (!have_defc) {
854 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
855 }
856 if (!have_name) {
857 //not java_lang_String::create_from_symbol; let's intern member names
858 Handle name = StringTable::intern(fd.name(), CHECK);
859 java_lang_invoke_MemberName::set_name(mname(), name());
860 }
861 if (!have_type) {
862 // If it is a primitive field type, don't mess with short strings like "I".
863 Handle type = field_signature_type_or_null(fd.signature());
864 if (type.is_null()) {
865 java_lang_String::create_from_symbol(fd.signature(), CHECK);
866 }
867 java_lang_invoke_MemberName::set_type(mname(), type());
868 }
869 return;
870 }
871 }
872 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
873 }
874
875 int MethodHandles::find_MemberNames(KlassHandle k,
876 Symbol* name, Symbol* sig,
877 int mflags, KlassHandle caller,
878 int skip, objArrayHandle results) {
879 // %%% take caller into account!
880
881 Thread* thread = Thread::current();
882
883 if (k.is_null() || !k->is_instance_klass()) return -1;
884
885 int rfill = 0, rlimit = results->length(), rskip = skip;
886 // overflow measurement:
887 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
888
889 int match_flags = mflags;
890 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
891 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
892 bool local_only = !(search_superc | search_intfc);
893 bool classes_only = false;
894
895 if (name != NULL) {
896 if (name->utf8_length() == 0) return 0; // a match is not possible
897 }
898 if (sig != NULL) {
899 if (sig->utf8_length() == 0) return 0; // a match is not possible
900 if (sig->byte_at(0) == '(')
901 match_flags &= ~(IS_FIELD | IS_TYPE);
902 else
903 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
904 }
905
906 if ((match_flags & IS_TYPE) != 0) {
907 // NYI, and Core Reflection works quite well for this query
908 }
909
910 if ((match_flags & IS_FIELD) != 0) {
911 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
912 if (name != NULL && st.name() != name)
913 continue;
914 if (sig != NULL && st.signature() != sig)
915 continue;
916 // passed the filters
917 if (rskip > 0) {
918 --rskip;
919 } else if (rfill < rlimit) {
920 Handle result(thread, results->obj_at(rfill++));
921 if (!java_lang_invoke_MemberName::is_instance(result()))
922 return -99; // caller bug!
923 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
924 if (saved != result())
925 results->obj_at_put(rfill-1, saved); // show saved instance to user
926 } else if (++overflow >= overflow_limit) {
927 match_flags = 0; break; // got tired of looking at overflow
928 }
929 }
930 }
931
932 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
933 // watch out for these guys:
934 Symbol* init_name = vmSymbols::object_initializer_name();
935 Symbol* clinit_name = vmSymbols::class_initializer_name();
936 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
937 bool negate_name_test = false;
938 // fix name so that it captures the intention of IS_CONSTRUCTOR
939 if (!(match_flags & IS_METHOD)) {
940 // constructors only
941 if (name == NULL) {
942 name = init_name;
943 } else if (name != init_name) {
944 return 0; // no constructors of this method name
945 }
946 } else if (!(match_flags & IS_CONSTRUCTOR)) {
947 // methods only
948 if (name == NULL) {
949 name = init_name;
950 negate_name_test = true; // if we see the name, we *omit* the entry
951 } else if (name == init_name) {
952 return 0; // no methods of this constructor name
953 }
954 } else {
955 // caller will accept either sort; no need to adjust name
956 }
957 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
958 Method* m = st.method();
959 Symbol* m_name = m->name();
960 if (m_name == clinit_name)
961 continue;
962 if (name != NULL && ((m_name != name) ^ negate_name_test))
963 continue;
964 if (sig != NULL && m->signature() != sig)
965 continue;
966 // passed the filters
967 if (rskip > 0) {
968 --rskip;
969 } else if (rfill < rlimit) {
970 Handle result(thread, results->obj_at(rfill++));
971 if (!java_lang_invoke_MemberName::is_instance(result()))
972 return -99; // caller bug!
973 CallInfo info(m);
974 oop saved = MethodHandles::init_method_MemberName(result, info);
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 void MemberNameTable::add_member_name(jweak mem_name_wref) {
1056 assert_locked_or_safepoint(MemberNameTable_lock);
1057 this->push(mem_name_wref);
1058 }
1059
1060 #if INCLUDE_JVMTI
1061 // It is called at safepoint only for RedefineClasses
1062 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) {
1063 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
1064 // For each redefined method
1065 for (int idx = 0; idx < length(); idx++) {
1066 oop mem_name = JNIHandles::resolve(this->at(idx));
1067 if (mem_name == NULL) {
1068 continue;
1069 }
1070 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
1071
1072 if (old_method == NULL || !old_method->is_old()) {
1073 continue; // skip uninteresting entries
1074 }
1075 if (old_method->is_deleted()) {
1076 // skip entries with deleted methods
1077 continue;
1078 }
1079 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum());
1080
1081 assert(new_method != NULL, "method_with_idnum() should not be NULL");
1082 assert(old_method != new_method, "sanity check");
1083
1084 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method);
1085
1086 if (log_is_enabled(Info, redefine, class, update)) {
1087 ResourceMark rm;
1088 if (!(*trace_name_printed)) {
1089 log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name());
1090 *trace_name_printed = true;
1091 }
1092 log_debug(redefine, class, update, constantpool)
1093 ("MemberName method update: %s(%s)",
1094 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
1095 }
1096 }
1097 }
1098 #endif // INCLUDE_JVMTI
1099
1100 //
1101 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1102 // They are the private interface between this JVM and the HotSpot-specific
1103 // Java code that implements JSR 292 method handles.
1104 //
1105 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1106 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1107 //
1108
1109 #ifndef PRODUCT
1110 #define EACH_NAMED_CON(template, requirement) \
1111 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1112 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1113 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1114 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1115 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1116 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1117 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1118 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1119 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1120 /*end*/
1121
1122 #define IGNORE_REQ(req_expr) /* req_expr */
1123 #define ONE_PLUS(scope,value) 1+
1124 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1125 #define VALUE_COMMA(scope,value) scope::value,
1126 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1127 #define STRING_NULL(scope,value) #value "\0"
1128 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1129
1130 static bool advertise_con_value(int which) {
1131 if (which < 0) return false;
1132 bool ok = true;
1133 int count = 0;
1134 #define INC_COUNT(scope,value) \
1135 ++count;
1136 #define CHECK_REQ(req_expr) \
1137 if (which < count) return ok; \
1138 ok = (req_expr);
1139 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1140 #undef INC_COUNT
1141 #undef CHECK_REQ
1142 assert(count == con_value_count, "");
1143 if (which < count) return ok;
1144 return false;
1145 }
1146
1147 #undef ONE_PLUS
1148 #undef VALUE_COMMA
1149 #undef STRING_NULL
1150 #undef EACH_NAMED_CON
1151 #endif // PRODUCT
1152
1153 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1154 #ifndef PRODUCT
1155 if (advertise_con_value(which)) {
1156 assert(which >= 0 && which < con_value_count, "");
1157 int con = con_values[which];
1158 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1159 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1160 const char* str = &con_names[0];
1161 for (int i = 0; i < which; i++)
1162 str += strlen(str) + 1; // skip name and null
1163 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1164 box->obj_at_put(0, name);
1165 }
1166 return con;
1167 }
1168 #endif
1169 return 0;
1170 }
1171 JVM_END
1172
1173 // void init(MemberName self, AccessibleObject ref)
1174 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1175 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1176 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1177 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1178 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1179 MethodHandles::init_MemberName(mname, target);
1180 }
1181 JVM_END
1182
1183 // void expand(MemberName self)
1184 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1185 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1186 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1187 MethodHandles::expand_MemberName(mname, 0, CHECK);
1188 }
1189 JVM_END
1190
1191 // void resolve(MemberName self, Class<?> caller)
1192 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1193 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1194 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1195
1196 // The trusted Java code that calls this method should already have performed
1197 // access checks on behalf of the given caller. But, we can verify this.
1198 if (VerifyMethodHandles && caller_jh != NULL &&
1199 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1200 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1201 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1202 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1203 }
1204
1205 // Reflection::verify_class_access can only handle instance classes.
1206 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1207 // Emulate LinkResolver::check_klass_accessability.
1208 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1209 if (Reflection::verify_class_access(caller,
1210 reference_klass,
1211 true) != Reflection::ACCESS_OK) {
1212 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1213 }
1214 }
1215 }
1216
1217 KlassHandle caller(THREAD,
1218 caller_jh == NULL ? (Klass*) NULL :
1219 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1220 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1221
1222 if (resolved.is_null()) {
1223 int flags = java_lang_invoke_MemberName::flags(mname());
1224 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1225 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1226 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1227 }
1228 if ((flags & ALL_KINDS) == IS_FIELD) {
1229 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1230 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1231 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1232 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1233 } else {
1234 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1235 }
1236 }
1237
1238 return JNIHandles::make_local(THREAD, resolved());
1239 }
1240 JVM_END
1241
1242 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1243 if (mname == NULL ||
1244 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1245 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1246 } else {
1247 int flags = java_lang_invoke_MemberName::flags(mname);
1248 if ((flags & IS_FIELD) != 0 &&
1249 (must_be_static
1250 ? (flags & JVM_ACC_STATIC) != 0
1251 : (flags & JVM_ACC_STATIC) == 0)) {
1252 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1253 return (jlong) vmindex;
1254 }
1255 }
1256 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1257 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1258 return 0;
1259 }
1260
1261 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1262 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1263 }
1264 JVM_END
1265
1266 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1267 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1268 }
1269 JVM_END
1270
1271 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1272 // use the other function to perform sanity checks:
1273 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1274 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1275 return JNIHandles::make_local(THREAD, clazz);
1276 }
1277 JVM_END
1278
1279 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1280 if (mname_jh == NULL) return NULL;
1281 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1282 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1283 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1284 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1285 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1286 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1287 result->obj_at_put(0, x);
1288 x = NULL;
1289 if (vmtarget == NULL) {
1290 x = NULL;
1291 } else if (vmtarget->is_klass()) {
1292 x = ((Klass*) vmtarget)->java_mirror();
1293 } else if (vmtarget->is_method()) {
1294 x = mname();
1295 }
1296 result->obj_at_put(1, x);
1297 return JNIHandles::make_local(env, result());
1298 }
1299 JVM_END
1300
1301
1302
1303 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1304 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1305 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1306 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1307 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1308 if (clazz_jh == NULL || results_jh == NULL) return -1;
1309 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1310
1311 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1312 if (results.is_null() || !results->is_objArray()) return -1;
1313
1314 TempNewSymbol name = NULL;
1315 TempNewSymbol sig = NULL;
1316 if (name_jh != NULL) {
1317 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1318 if (name == NULL) return 0; // a match is not possible
1319 }
1320 if (sig_jh != NULL) {
1321 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1322 if (sig == NULL) return 0; // a match is not possible
1323 }
1324
1325 KlassHandle caller;
1326 if (caller_jh != NULL) {
1327 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1328 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1329 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1330 }
1331
1332 if (name != NULL && sig != NULL && results.not_null()) {
1333 // try a direct resolve
1334 // %%% TO DO
1335 }
1336
1337 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1338 caller, skip, results);
1339 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1340 return res;
1341 }
1342 JVM_END
1343
1344 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1345 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1346 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1347 {
1348 // Walk all nmethods depending on this call site.
1349 MutexLocker mu(Compile_lock, thread);
1350 MethodHandles::flush_dependent_nmethods(call_site, target);
1351 java_lang_invoke_CallSite::set_target(call_site(), target());
1352 }
1353 }
1354 JVM_END
1355
1356 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1357 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1358 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1359 {
1360 // Walk all nmethods depending on this call site.
1361 MutexLocker mu(Compile_lock, thread);
1362 MethodHandles::flush_dependent_nmethods(call_site, target);
1363 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1364 }
1365 }
1366 JVM_END
1367
1368 // It is called by a Cleaner object which ensures that dropped CallSites properly
1369 // deallocate their dependency information.
1370 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1371 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1372 {
1373 // Walk all nmethods depending on this call site.
1374 MutexLocker mu1(Compile_lock, thread);
1375
1376 int marked = 0;
1377 {
1378 NoSafepointVerifier nsv;
1379 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1380 assert(safe_to_expunge(), "removal is not safe");
1381 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1382 marked = deps.remove_all_dependents();
1383 }
1384 if (marked > 0) {
1385 // At least one nmethod has been marked for deoptimization
1386 VM_Deoptimize op;
1387 VMThread::execute(&op);
1388 }
1389 }
1390 }
1391 JVM_END
1392
1393 /**
1394 * Throws a java/lang/UnsupportedOperationException unconditionally.
1395 * This is required by the specification of MethodHandle.invoke if
1396 * invoked directly.
1397 */
1398 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1399 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1400 return NULL;
1401 }
1402 JVM_END
1403
1404 /**
1405 * Throws a java/lang/UnsupportedOperationException unconditionally.
1406 * This is required by the specification of MethodHandle.invokeExact if
1407 * invoked directly.
1408 */
1409 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1410 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1411 return NULL;
1412 }
1413 JVM_END
1414
1415 /// JVM_RegisterMethodHandleMethods
1416
1417 #undef CS // Solaris builds complain
1418
1419 #define LANG "Ljava/lang/"
1420 #define JLINV "Ljava/lang/invoke/"
1421
1422 #define OBJ LANG "Object;"
1423 #define CLS LANG "Class;"
1424 #define STRG LANG "String;"
1425 #define CS JLINV "CallSite;"
1426 #define MT JLINV "MethodType;"
1427 #define MH JLINV "MethodHandle;"
1428 #define MEM JLINV "MemberName;"
1429 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1430
1431 #define CC (char*) /*cast a literal from (const char*)*/
1432 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1433
1434 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1435 static JNINativeMethod MHN_methods[] = {
1436 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1437 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1438 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)},
1439 // static native int getNamedCon(int which, Object[] name)
1440 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1441 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1442 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1443 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1444 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1445 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1446 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1447 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1448 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1449 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1450 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1451 };
1452
1453 static JNINativeMethod MH_methods[] = {
1454 // UnsupportedOperationException throwers
1455 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1456 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1457 };
1458
1459 /**
1460 * This one function is exported, used by NativeLookup.
1461 */
1462 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1463 assert(!MethodHandles::enabled(), "must not be enabled");
1464 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1465
1466 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1467 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1468
1469 {
1470 ThreadToNativeFromVM ttnfv(thread);
1471
1472 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1473 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1474 "register java.lang.invoke.MethodHandleNative natives");
1475
1476 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1477 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1478 "register java.lang.invoke.MethodHandle natives");
1479 }
1480
1481 if (TraceInvokeDynamic) {
1482 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1483 }
1484
1485 MethodHandles::set_enabled(true);
1486 }
1487 JVM_END