1 /*
2 * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/codeCacheExtensions.hpp"
30 #include "code/dependencyContext.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "interpreter/oopMapCache.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "oops/objArrayOop.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/methodHandles.hpp"
40 #include "prims/jvmtiRedefineClassesTrace.hpp"
41 #include "runtime/compilationPolicy.hpp"
42 #include "runtime/javaCalls.hpp"
43 #include "runtime/logTimer.hpp"
44 #include "runtime/reflection.hpp"
45 #include "runtime/signature.hpp"
46 #include "runtime/stubRoutines.hpp"
47 #include "utilities/exceptions.hpp"
48
49
50 /*
51 * JSR 292 reference implementation: method handles
52 * The JDK 7 reference implementation represented method handle
53 * combinations as chains. Each link in the chain had a "vmentry"
54 * field which pointed at a bit of assembly code which performed
55 * one transformation before dispatching to the next link in the chain.
56 *
57 * The current reference implementation pushes almost all code generation
58 * responsibility to (trusted) Java code. A method handle contains a
59 * pointer to its "LambdaForm", which embodies all details of the method
60 * handle's behavior. The LambdaForm is a normal Java object, managed
61 * by a runtime coded in Java.
62 */
63
64 bool MethodHandles::_enabled = false; // set true after successful native linkage
65 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
66
67 /**
68 * 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 TraceStartupTime timer("MethodHandles adapters generation");
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 class.
322 // * It has a single formal parameter of type Object[].
323 // * It has a return type of Object.
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 return false;
333 Symbol* poly_sig = vmSymbols::object_array_object_signature();
334 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
335 if (m == NULL) return false;
336 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
337 int flags = m->access_flags().as_int();
338 return (flags & required) == required;
339 }
340
341
342 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
343 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
344 switch (iid) {
345 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
346 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
347 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
348 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
349 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
350 }
351 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
352 return 0;
353 }
354
355 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
356 switch(id) {
357 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
358 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
359 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
360 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
361 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
362 default:
363 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
364 return Bytecodes::_illegal;
365 }
366 }
367
368 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
369 switch (iid) {
370 case vmIntrinsics::_invokeBasic: return 0;
371 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
372 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
373 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
374 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
375 }
376 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
377 return 0;
378 }
379
380 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
381 vmSymbols::SID name_id = vmSymbols::find_sid(name);
382 switch (name_id) {
383 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
384 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
385 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
386 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
387
388 // There is one static signature-polymorphic method for each JVM invocation mode.
389 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
390 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
391 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
392 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
393 }
394
395 // Cover the case of invokeExact and any future variants of invokeFoo.
396 Klass* mh_klass = SystemDictionary::well_known_klass(
397 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
398 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
399 return vmIntrinsics::_invokeGeneric;
400
401 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
402 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
403 return vmIntrinsics::_none;
404 }
405
406 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
407 if (klass != NULL &&
408 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
409 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
410 if (iid != vmIntrinsics::_none)
411 return iid;
412 if (is_method_handle_invoke_name(klass, name))
413 return vmIntrinsics::_invokeGeneric;
414 }
415 return vmIntrinsics::_none;
416 }
417
418
419 // convert the external string or reflective type to an internal signature
420 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
421 if (java_lang_invoke_MethodType::is_instance(type_str)) {
422 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
423 } else if (java_lang_Class::is_instance(type_str)) {
424 return java_lang_Class::as_signature(type_str, false, THREAD);
425 } else if (java_lang_String::is_instance_inlined(type_str)) {
426 if (intern_if_not_found) {
427 return java_lang_String::as_symbol(type_str, THREAD);
428 } else {
429 return java_lang_String::as_symbol_or_null(type_str);
430 }
431 } else {
432 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
433 }
434 }
435
436 static const char OBJ_SIG[] = "Ljava/lang/Object;";
437 enum { OBJ_SIG_LEN = 18 };
438
439 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
440 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
441 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
442 const int len = sig->utf8_length();
443 for (int i = 0; i < len; i++) {
444 switch (sig->byte_at(i)) {
445 case 'L':
446 // only java/lang/Object is valid here
447 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
448 return false;
449 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
450 continue;
451 case '(': case ')': case 'V':
452 case 'I': case 'J': case 'F': case 'D':
453 continue;
454 //case '[':
455 //case 'Z': case 'B': case 'C': case 'S':
456 default:
457 return false;
458 }
459 }
460 return true;
461 }
462
463 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
464 Symbol* bsig = NULL;
465 if (sig == NULL) {
466 return sig;
467 } else if (is_basic_type_signature(sig)) {
468 sig->increment_refcount();
469 return sig; // that was easy
470 } else if (sig->byte_at(0) != '(') {
471 BasicType bt = char2type(sig->byte_at(0));
472 if (is_subword_type(bt)) {
473 bsig = vmSymbols::int_signature();
474 } else {
475 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
476 bsig = vmSymbols::object_signature();
477 }
478 } else {
479 ResourceMark rm;
480 stringStream buffer(128);
481 buffer.put('(');
482 int arg_pos = 0, keep_arg_pos = -1;
483 if (keep_last_arg)
484 keep_arg_pos = ArgumentCount(sig).size() - 1;
485 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
486 BasicType bt = ss.type();
487 size_t this_arg_pos = buffer.size();
488 if (ss.at_return_type()) {
489 buffer.put(')');
490 }
491 if (arg_pos == keep_arg_pos) {
492 buffer.write((char*) ss.raw_bytes(),
493 (int) ss.raw_length());
494 } else if (bt == T_OBJECT || bt == T_ARRAY) {
495 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
496 } else {
497 if (is_subword_type(bt))
498 bt = T_INT;
499 buffer.put(type2char(bt));
500 }
501 arg_pos++;
502 }
503 const char* sigstr = buffer.base();
504 int siglen = (int) buffer.size();
505 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
506 }
507 assert(is_basic_type_signature(bsig) ||
508 // detune assert in case the injected argument is not a basic type:
509 keep_last_arg, "");
510 return bsig;
511 }
512
513 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
514 Symbol* sig,
515 bool keep_arrays,
516 bool keep_basic_names) {
517 st = st ? st : tty;
518 int len = sig->utf8_length();
519 int array = 0;
520 bool prev_type = false;
521 for (int i = 0; i < len; i++) {
522 char ch = sig->byte_at(i);
523 switch (ch) {
524 case '(': case ')':
525 prev_type = false;
526 st->put(ch);
527 continue;
528 case '[':
529 if (!keep_basic_names && keep_arrays)
530 st->put(ch);
531 array++;
532 continue;
533 case 'L':
534 {
535 if (prev_type) st->put(',');
536 int start = i+1, slash = start;
537 while (++i < len && (ch = sig->byte_at(i)) != ';') {
538 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
539 }
540 if (slash < i) start = slash;
541 if (!keep_basic_names) {
542 st->put('L');
543 } else {
544 for (int j = start; j < i; j++)
545 st->put(sig->byte_at(j));
546 prev_type = true;
547 }
548 break;
549 }
550 default:
551 {
552 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
553 ch = '[';
554 array = 0;
555 }
556 if (prev_type) st->put(',');
557 const char* n = NULL;
558 if (keep_basic_names)
559 n = type2name(char2type(ch));
560 if (n == NULL) {
561 // unknown letter, or we don't want to know its name
562 st->put(ch);
563 } else {
564 st->print("%s", n);
565 prev_type = true;
566 }
567 break;
568 }
569 }
570 // Switch break goes here to take care of array suffix:
571 if (prev_type) {
572 while (array > 0) {
573 st->print("[]");
574 --array;
575 }
576 }
577 array = 0;
578 }
579 }
580
581
582
583 static oop object_java_mirror() {
584 return SystemDictionary::Object_klass()->java_mirror();
585 }
586
587 oop MethodHandles::field_name_or_null(Symbol* s) {
588 if (s == NULL) return NULL;
589 return StringTable::lookup(s);
590 }
591
592 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
593 if (s == NULL) return NULL;
594 BasicType bt = FieldType::basic_type(s);
595 if (is_java_primitive(bt)) {
596 assert(s->utf8_length() == 1, "");
597 return java_lang_Class::primitive_mirror(bt);
598 }
599 // Here are some more short cuts for common types.
600 // They are optional, since reference types can be resolved lazily.
601 if (bt == T_OBJECT) {
602 if (s == vmSymbols::object_signature()) {
603 return object_java_mirror();
604 } else if (s == vmSymbols::class_signature()) {
605 return SystemDictionary::Class_klass()->java_mirror();
606 } else if (s == vmSymbols::string_signature()) {
607 return SystemDictionary::String_klass()->java_mirror();
608 }
609 }
610 return NULL;
611 }
612
613
614 // An unresolved member name is a mere symbolic reference.
615 // Resolving it plants a vmtarget/vmindex in it,
616 // which refers directly to JVM internals.
617 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
618 Handle empty;
619 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
620
621 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
622 // Already resolved.
623 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
624 assert(vmindex >= Method::nonvirtual_vtable_index, "");
625 return mname;
626 }
627
628 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
629 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
630 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
631 int flags = java_lang_invoke_MemberName::flags(mname());
632 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
633 if (!ref_kind_is_valid(ref_kind)) {
634 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
635 }
636
637 DEBUG_ONLY(int old_vmindex);
638 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
639
640 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
641 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
642 }
643
644 instanceKlassHandle defc;
645 {
646 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
647 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
648 if (!defc_klass->is_instance_klass()) {
649 if (!defc_klass->is_array_klass()) return empty;
650 defc_klass = SystemDictionary::Object_klass();
651 }
652 defc = instanceKlassHandle(THREAD, defc_klass);
653 }
654 if (defc.is_null()) {
655 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
656 }
657 defc->link_class(CHECK_(empty)); // possible safepoint
658
659 // convert the external string name to an internal symbol
660 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
661 if (name == NULL) return empty; // no such name
662 if (name == vmSymbols::class_initializer_name())
663 return empty; // illegal name
664
665 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
666 if ((flags & ALL_KINDS) == IS_METHOD &&
667 (defc() == SystemDictionary::MethodHandle_klass()) &&
668 (ref_kind == JVM_REF_invokeVirtual ||
669 ref_kind == JVM_REF_invokeSpecial ||
670 // static invocation mode is required for _linkToVirtual, etc.:
671 ref_kind == JVM_REF_invokeStatic)) {
672 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
673 if (iid != vmIntrinsics::_none &&
674 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
675 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
676 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
677 mh_invoke_id = iid;
678 }
679 }
680
681 // convert the external string or reflective type to an internal signature
682 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
683 if (type == NULL) return empty; // no such signature exists in the VM
684
685 // Time to do the lookup.
686 switch (flags & ALL_KINDS) {
687 case IS_METHOD:
688 {
689 CallInfo result;
690 LinkInfo link_info(defc, name, type, caller, caller.not_null());
691 {
692 assert(!HAS_PENDING_EXCEPTION, "");
693 if (ref_kind == JVM_REF_invokeStatic) {
694 LinkResolver::resolve_static_call(result,
695 link_info, false, THREAD);
696 } else if (ref_kind == JVM_REF_invokeInterface) {
697 LinkResolver::resolve_interface_call(result, Handle(), defc,
698 link_info, false, THREAD);
699 } else if (mh_invoke_id != vmIntrinsics::_none) {
700 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
701 LinkResolver::resolve_handle_call(result, link_info, THREAD);
702 } else if (ref_kind == JVM_REF_invokeSpecial) {
703 LinkResolver::resolve_special_call(result,
704 link_info, THREAD);
705 } else if (ref_kind == JVM_REF_invokeVirtual) {
706 LinkResolver::resolve_virtual_call(result, Handle(), defc,
707 link_info, false, THREAD);
708 } else {
709 assert(false, "ref_kind=%d", ref_kind);
710 }
711 if (HAS_PENDING_EXCEPTION) {
712 return empty;
713 }
714 }
715 if (result.resolved_appendix().not_null()) {
716 // The resolved MemberName must not be accompanied by an appendix argument,
717 // since there is no way to bind this value into the MemberName.
718 // Caller is responsible to prevent this from happening.
719 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
720 }
721 oop mname2 = init_method_MemberName(mname, result);
722 return Handle(THREAD, mname2);
723 }
724 case IS_CONSTRUCTOR:
725 {
726 CallInfo result;
727 LinkInfo link_info(defc, name, type, caller, caller.not_null());
728 {
729 assert(!HAS_PENDING_EXCEPTION, "");
730 if (name == vmSymbols::object_initializer_name()) {
731 LinkResolver::resolve_special_call(result, link_info, THREAD);
732 } else {
733 break; // will throw after end of switch
734 }
735 if (HAS_PENDING_EXCEPTION) {
736 return empty;
737 }
738 }
739 assert(result.is_statically_bound(), "");
740 oop mname2 = init_method_MemberName(mname, result);
741 return Handle(THREAD, mname2);
742 }
743 case IS_FIELD:
744 {
745 fieldDescriptor result; // find_field initializes fd if found
746 {
747 assert(!HAS_PENDING_EXCEPTION, "");
748 LinkInfo link_info(defc, name, type, caller, /*check_access*/false);
749 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
750 if (HAS_PENDING_EXCEPTION) {
751 return empty;
752 }
753 }
754 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
755 return Handle(THREAD, mname2);
756 }
757 default:
758 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
759 }
760
761 return empty;
762 }
763
764 // Conversely, a member name which is only initialized from JVM internals
765 // may have null defc, name, and type fields.
766 // Resolving it plants a vmtarget/vmindex in it,
767 // which refers directly to JVM internals.
768 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
769 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
770 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
771 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
772 if (vmtarget == NULL) {
773 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
774 }
775
776 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
777 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
778 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
779 int flags = java_lang_invoke_MemberName::flags(mname());
780
781 if (suppress != 0) {
782 if (suppress & _suppress_defc) have_defc = true;
783 if (suppress & _suppress_name) have_name = true;
784 if (suppress & _suppress_type) have_type = true;
785 }
786
787 if (have_defc && have_name && have_type) return; // nothing needed
788
789 switch (flags & ALL_KINDS) {
790 case IS_METHOD:
791 case IS_CONSTRUCTOR:
792 {
793 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
794 methodHandle m(THREAD, (Method*)vmtarget);
795 DEBUG_ONLY(vmtarget = NULL); // safety
796 if (m.is_null()) break;
797 if (!have_defc) {
798 InstanceKlass* defc = m->method_holder();
799 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
800 }
801 if (!have_name) {
802 //not java_lang_String::create_from_symbol; let's intern member names
803 Handle name = StringTable::intern(m->name(), CHECK);
804 java_lang_invoke_MemberName::set_name(mname(), name());
805 }
806 if (!have_type) {
807 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
808 java_lang_invoke_MemberName::set_type(mname(), type());
809 }
810 return;
811 }
812 case IS_FIELD:
813 {
814 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
815 if (!((Klass*) vmtarget)->is_instance_klass()) break;
816 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
817 DEBUG_ONLY(vmtarget = NULL); // safety
818 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
819 fieldDescriptor fd; // find_field initializes fd if found
820 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
821 break; // cannot expand
822 if (!have_defc) {
823 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
824 }
825 if (!have_name) {
826 //not java_lang_String::create_from_symbol; let's intern member names
827 Handle name = StringTable::intern(fd.name(), CHECK);
828 java_lang_invoke_MemberName::set_name(mname(), name());
829 }
830 if (!have_type) {
831 // If it is a primitive field type, don't mess with short strings like "I".
832 Handle type = field_signature_type_or_null(fd.signature());
833 if (type.is_null()) {
834 java_lang_String::create_from_symbol(fd.signature(), CHECK);
835 }
836 java_lang_invoke_MemberName::set_type(mname(), type());
837 }
838 return;
839 }
840 }
841 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
842 }
843
844 int MethodHandles::find_MemberNames(KlassHandle k,
845 Symbol* name, Symbol* sig,
846 int mflags, KlassHandle caller,
847 int skip, objArrayHandle results) {
848 // %%% take caller into account!
849
850 Thread* thread = Thread::current();
851
852 if (k.is_null() || !k->is_instance_klass()) return -1;
853
854 int rfill = 0, rlimit = results->length(), rskip = skip;
855 // overflow measurement:
856 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
857
858 int match_flags = mflags;
859 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
860 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
861 bool local_only = !(search_superc | search_intfc);
862 bool classes_only = false;
863
864 if (name != NULL) {
865 if (name->utf8_length() == 0) return 0; // a match is not possible
866 }
867 if (sig != NULL) {
868 if (sig->utf8_length() == 0) return 0; // a match is not possible
869 if (sig->byte_at(0) == '(')
870 match_flags &= ~(IS_FIELD | IS_TYPE);
871 else
872 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
873 }
874
875 if ((match_flags & IS_TYPE) != 0) {
876 // NYI, and Core Reflection works quite well for this query
877 }
878
879 if ((match_flags & IS_FIELD) != 0) {
880 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
881 if (name != NULL && st.name() != name)
882 continue;
883 if (sig != NULL && st.signature() != sig)
884 continue;
885 // passed the filters
886 if (rskip > 0) {
887 --rskip;
888 } else if (rfill < rlimit) {
889 Handle result(thread, results->obj_at(rfill++));
890 if (!java_lang_invoke_MemberName::is_instance(result()))
891 return -99; // caller bug!
892 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
893 if (saved != result())
894 results->obj_at_put(rfill-1, saved); // show saved instance to user
895 } else if (++overflow >= overflow_limit) {
896 match_flags = 0; break; // got tired of looking at overflow
897 }
898 }
899 }
900
901 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
902 // watch out for these guys:
903 Symbol* init_name = vmSymbols::object_initializer_name();
904 Symbol* clinit_name = vmSymbols::class_initializer_name();
905 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
906 bool negate_name_test = false;
907 // fix name so that it captures the intention of IS_CONSTRUCTOR
908 if (!(match_flags & IS_METHOD)) {
909 // constructors only
910 if (name == NULL) {
911 name = init_name;
912 } else if (name != init_name) {
913 return 0; // no constructors of this method name
914 }
915 } else if (!(match_flags & IS_CONSTRUCTOR)) {
916 // methods only
917 if (name == NULL) {
918 name = init_name;
919 negate_name_test = true; // if we see the name, we *omit* the entry
920 } else if (name == init_name) {
921 return 0; // no methods of this constructor name
922 }
923 } else {
924 // caller will accept either sort; no need to adjust name
925 }
926 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
927 Method* m = st.method();
928 Symbol* m_name = m->name();
929 if (m_name == clinit_name)
930 continue;
931 if (name != NULL && ((m_name != name) ^ negate_name_test))
932 continue;
933 if (sig != NULL && m->signature() != sig)
934 continue;
935 // passed the filters
936 if (rskip > 0) {
937 --rskip;
938 } else if (rfill < rlimit) {
939 Handle result(thread, results->obj_at(rfill++));
940 if (!java_lang_invoke_MemberName::is_instance(result()))
941 return -99; // caller bug!
942 CallInfo info(m);
943 oop saved = MethodHandles::init_method_MemberName(result, info);
944 if (saved != result())
945 results->obj_at_put(rfill-1, saved); // show saved instance to user
946 } else if (++overflow >= overflow_limit) {
947 match_flags = 0; break; // got tired of looking at overflow
948 }
949 }
950 }
951
952 // return number of elements we at leasted wanted to initialize
953 return rfill + overflow;
954 }
955
956 // Is it safe to remove stale entries from a dependency list?
957 static bool safe_to_expunge() {
958 // Since parallel GC threads can concurrently iterate over a dependency
959 // list during safepoint, it is safe to remove entries only when
960 // CodeCache lock is held.
961 return CodeCache_lock->owned_by_self();
962 }
963
964 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
965 assert_locked_or_safepoint(CodeCache_lock);
966
967 oop context = java_lang_invoke_CallSite::context(call_site);
968 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
969 // Try to purge stale entries on updates.
970 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
971 // in order to avoid memory leak, stale entries are purged whenever a dependency list
972 // is changed (both on addition and removal). Though memory reclamation is delayed,
973 // it avoids indefinite memory usage growth.
974 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
975 }
976
977 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
978 assert_locked_or_safepoint(CodeCache_lock);
979
980 oop context = java_lang_invoke_CallSite::context(call_site);
981 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
982 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
983 }
984
985 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
986 assert_lock_strong(Compile_lock);
987
988 int marked = 0;
989 CallSiteDepChange changes(call_site(), target());
990 {
991 NoSafepointVerifier nsv;
992 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
993
994 oop context = java_lang_invoke_CallSite::context(call_site());
995 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
996 marked = deps.mark_dependent_nmethods(changes);
997 }
998 if (marked > 0) {
999 // At least one nmethod has been marked for deoptimization.
1000 VM_Deoptimize op;
1001 VMThread::execute(&op);
1002 }
1003 }
1004
1005 //------------------------------------------------------------------------------
1006 // MemberNameTable
1007 //
1008
1009 MemberNameTable::MemberNameTable(int methods_cnt)
1010 : GrowableArray<jweak>(methods_cnt, true) {
1011 assert_locked_or_safepoint(MemberNameTable_lock);
1012 }
1013
1014 MemberNameTable::~MemberNameTable() {
1015 assert_locked_or_safepoint(MemberNameTable_lock);
1016 int len = this->length();
1017
1018 for (int idx = 0; idx < len; idx++) {
1019 jweak ref = this->at(idx);
1020 JNIHandles::destroy_weak_global(ref);
1021 }
1022 }
1023
1024 void MemberNameTable::add_member_name(jweak mem_name_wref) {
1025 assert_locked_or_safepoint(MemberNameTable_lock);
1026 this->push(mem_name_wref);
1027 }
1028
1029 #if INCLUDE_JVMTI
1030 // It is called at safepoint only for RedefineClasses
1031 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) {
1032 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
1033 // For each redefined method
1034 for (int idx = 0; idx < length(); idx++) {
1035 oop mem_name = JNIHandles::resolve(this->at(idx));
1036 if (mem_name == NULL) {
1037 continue;
1038 }
1039 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
1040
1041 if (old_method == NULL || !old_method->is_old()) {
1042 continue; // skip uninteresting entries
1043 }
1044 if (old_method->is_deleted()) {
1045 // skip entries with deleted methods
1046 continue;
1047 }
1048 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum());
1049
1050 assert(new_method != NULL, "method_with_idnum() should not be NULL");
1051 assert(old_method != new_method, "sanity check");
1052
1053 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method);
1054
1055 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1056 if (!(*trace_name_printed)) {
1057 // RC_TRACE_MESG macro has an embedded ResourceMark
1058 RC_TRACE_MESG(("adjust: name=%s",
1059 old_method->method_holder()->external_name()));
1060 *trace_name_printed = true;
1061 }
1062 // RC_TRACE macro has an embedded ResourceMark
1063 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
1064 new_method->name()->as_C_string(),
1065 new_method->signature()->as_C_string()));
1066 }
1067 }
1068 }
1069 #endif // INCLUDE_JVMTI
1070
1071 //
1072 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1073 // They are the private interface between this JVM and the HotSpot-specific
1074 // Java code that implements JSR 292 method handles.
1075 //
1076 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1077 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1078 //
1079
1080 #ifndef PRODUCT
1081 #define EACH_NAMED_CON(template, requirement) \
1082 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1083 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1084 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1085 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1086 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1087 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1088 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1089 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1090 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1091 /*end*/
1092
1093 #define IGNORE_REQ(req_expr) /* req_expr */
1094 #define ONE_PLUS(scope,value) 1+
1095 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1096 #define VALUE_COMMA(scope,value) scope::value,
1097 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1098 #define STRING_NULL(scope,value) #value "\0"
1099 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1100
1101 static bool advertise_con_value(int which) {
1102 if (which < 0) return false;
1103 bool ok = true;
1104 int count = 0;
1105 #define INC_COUNT(scope,value) \
1106 ++count;
1107 #define CHECK_REQ(req_expr) \
1108 if (which < count) return ok; \
1109 ok = (req_expr);
1110 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1111 #undef INC_COUNT
1112 #undef CHECK_REQ
1113 assert(count == con_value_count, "");
1114 if (which < count) return ok;
1115 return false;
1116 }
1117
1118 #undef ONE_PLUS
1119 #undef VALUE_COMMA
1120 #undef STRING_NULL
1121 #undef EACH_NAMED_CON
1122 #endif // PRODUCT
1123
1124 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1125 #ifndef PRODUCT
1126 if (advertise_con_value(which)) {
1127 assert(which >= 0 && which < con_value_count, "");
1128 int con = con_values[which];
1129 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1130 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1131 const char* str = &con_names[0];
1132 for (int i = 0; i < which; i++)
1133 str += strlen(str) + 1; // skip name and null
1134 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1135 box->obj_at_put(0, name);
1136 }
1137 return con;
1138 }
1139 #endif
1140 return 0;
1141 }
1142 JVM_END
1143
1144 // void init(MemberName self, AccessibleObject ref)
1145 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1146 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1147 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1148 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1149 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1150 MethodHandles::init_MemberName(mname, target);
1151 }
1152 JVM_END
1153
1154 // void expand(MemberName self)
1155 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1156 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1157 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1158 MethodHandles::expand_MemberName(mname, 0, CHECK);
1159 }
1160 JVM_END
1161
1162 // void resolve(MemberName self, Class<?> caller)
1163 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1164 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1165 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1166
1167 // The trusted Java code that calls this method should already have performed
1168 // access checks on behalf of the given caller. But, we can verify this.
1169 if (VerifyMethodHandles && caller_jh != NULL &&
1170 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1171 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1172 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1173 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1174 }
1175
1176 // Reflection::verify_class_access can only handle instance classes.
1177 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1178 // Emulate LinkResolver::check_klass_accessability.
1179 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1180 if (!Reflection::verify_class_access(caller,
1181 reference_klass,
1182 true)) {
1183 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1184 }
1185 }
1186 }
1187
1188 KlassHandle caller(THREAD,
1189 caller_jh == NULL ? (Klass*) NULL :
1190 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1191 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1192
1193 if (resolved.is_null()) {
1194 int flags = java_lang_invoke_MemberName::flags(mname());
1195 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1196 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1197 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1198 }
1199 if ((flags & ALL_KINDS) == IS_FIELD) {
1200 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1201 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1202 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1203 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1204 } else {
1205 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1206 }
1207 }
1208
1209 return JNIHandles::make_local(THREAD, resolved());
1210 }
1211 JVM_END
1212
1213 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1214 if (mname == NULL ||
1215 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1216 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1217 } else {
1218 int flags = java_lang_invoke_MemberName::flags(mname);
1219 if ((flags & IS_FIELD) != 0 &&
1220 (must_be_static
1221 ? (flags & JVM_ACC_STATIC) != 0
1222 : (flags & JVM_ACC_STATIC) == 0)) {
1223 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1224 return (jlong) vmindex;
1225 }
1226 }
1227 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1228 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1229 return 0;
1230 }
1231
1232 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1233 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1234 }
1235 JVM_END
1236
1237 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1238 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1239 }
1240 JVM_END
1241
1242 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1243 // use the other function to perform sanity checks:
1244 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1245 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1246 return JNIHandles::make_local(THREAD, clazz);
1247 }
1248 JVM_END
1249
1250 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1251 if (mname_jh == NULL) return NULL;
1252 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1253 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1254 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1255 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1256 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1257 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1258 result->obj_at_put(0, x);
1259 x = NULL;
1260 if (vmtarget == NULL) {
1261 x = NULL;
1262 } else if (vmtarget->is_klass()) {
1263 x = ((Klass*) vmtarget)->java_mirror();
1264 } else if (vmtarget->is_method()) {
1265 x = mname();
1266 }
1267 result->obj_at_put(1, x);
1268 return JNIHandles::make_local(env, result());
1269 }
1270 JVM_END
1271
1272
1273
1274 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1275 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1276 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1277 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1278 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1279 if (clazz_jh == NULL || results_jh == NULL) return -1;
1280 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1281
1282 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1283 if (results.is_null() || !results->is_objArray()) return -1;
1284
1285 TempNewSymbol name = NULL;
1286 TempNewSymbol sig = NULL;
1287 if (name_jh != NULL) {
1288 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1289 if (name == NULL) return 0; // a match is not possible
1290 }
1291 if (sig_jh != NULL) {
1292 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1293 if (sig == NULL) return 0; // a match is not possible
1294 }
1295
1296 KlassHandle caller;
1297 if (caller_jh != NULL) {
1298 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1299 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1300 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1301 }
1302
1303 if (name != NULL && sig != NULL && results.not_null()) {
1304 // try a direct resolve
1305 // %%% TO DO
1306 }
1307
1308 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1309 caller, skip, results);
1310 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1311 return res;
1312 }
1313 JVM_END
1314
1315 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1316 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1317 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1318 {
1319 // Walk all nmethods depending on this call site.
1320 MutexLocker mu(Compile_lock, thread);
1321 MethodHandles::flush_dependent_nmethods(call_site, target);
1322 java_lang_invoke_CallSite::set_target(call_site(), target());
1323 }
1324 }
1325 JVM_END
1326
1327 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1328 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1329 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1330 {
1331 // Walk all nmethods depending on this call site.
1332 MutexLocker mu(Compile_lock, thread);
1333 MethodHandles::flush_dependent_nmethods(call_site, target);
1334 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1335 }
1336 }
1337 JVM_END
1338
1339 // It is called by a Cleaner object which ensures that dropped CallSites properly
1340 // deallocate their dependency information.
1341 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1342 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1343 {
1344 // Walk all nmethods depending on this call site.
1345 MutexLocker mu1(Compile_lock, thread);
1346
1347 int marked = 0;
1348 {
1349 NoSafepointVerifier nsv;
1350 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1351 assert(safe_to_expunge(), "removal is not safe");
1352 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1353 marked = deps.remove_all_dependents();
1354 }
1355 if (marked > 0) {
1356 // At least one nmethod has been marked for deoptimization
1357 VM_Deoptimize op;
1358 VMThread::execute(&op);
1359 }
1360 }
1361 }
1362 JVM_END
1363
1364 /**
1365 * Throws a java/lang/UnsupportedOperationException unconditionally.
1366 * This is required by the specification of MethodHandle.invoke if
1367 * invoked directly.
1368 */
1369 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1370 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1371 return NULL;
1372 }
1373 JVM_END
1374
1375 /**
1376 * Throws a java/lang/UnsupportedOperationException unconditionally.
1377 * This is required by the specification of MethodHandle.invokeExact if
1378 * invoked directly.
1379 */
1380 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1381 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1382 return NULL;
1383 }
1384 JVM_END
1385
1386 /// JVM_RegisterMethodHandleMethods
1387
1388 #undef CS // Solaris builds complain
1389
1390 #define LANG "Ljava/lang/"
1391 #define JLINV "Ljava/lang/invoke/"
1392
1393 #define OBJ LANG "Object;"
1394 #define CLS LANG "Class;"
1395 #define STRG LANG "String;"
1396 #define CS JLINV "CallSite;"
1397 #define MT JLINV "MethodType;"
1398 #define MH JLINV "MethodHandle;"
1399 #define MEM JLINV "MemberName;"
1400 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1401
1402 #define CC (char*) /*cast a literal from (const char*)*/
1403 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1404
1405 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1406 static JNINativeMethod MHN_methods[] = {
1407 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1408 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1409 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)},
1410 // static native int getNamedCon(int which, Object[] name)
1411 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1412 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1413 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1414 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1415 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1416 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1417 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1418 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1419 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1420 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1421 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1422 };
1423
1424 static JNINativeMethod MH_methods[] = {
1425 // UnsupportedOperationException throwers
1426 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1427 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1428 };
1429
1430 /**
1431 * This one function is exported, used by NativeLookup.
1432 */
1433 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1434 assert(!MethodHandles::enabled(), "must not be enabled");
1435 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1436
1437 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1438 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1439
1440 {
1441 ThreadToNativeFromVM ttnfv(thread);
1442
1443 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1444 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1445 "register java.lang.invoke.MethodHandleNative natives");
1446
1447 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1448 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1449 "register java.lang.invoke.MethodHandle natives");
1450 }
1451
1452 if (TraceInvokeDynamic) {
1453 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1454 }
1455
1456 MethodHandles::set_enabled(true);
1457 }
1458 JVM_END