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