1 /*
2 * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "code/codeCache.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "interpreter/interpreter.hpp"
31 #include "interpreter/oopMapCache.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/allocation.inline.hpp"
34 #include "memory/oopFactory.hpp"
35 #include "oops/objArrayOop.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/methodHandles.hpp"
38 #include "prims/jvmtiRedefineClassesTrace.hpp"
39 #include "prims/unsafe.hpp"
40 #include "runtime/compilationPolicy.hpp"
41 #include "runtime/javaCalls.hpp"
42 #include "runtime/reflection.hpp"
43 #include "runtime/signature.hpp"
44 #include "runtime/stubRoutines.hpp"
45 #include "utilities/exceptions.hpp"
46
47
48 /*
49 * JSR 292 reference implementation: method handles
50 * The JDK 7 reference implementation represented method handle
51 * combinations as chains. Each link in the chain had a "vmentry"
52 * field which pointed at a bit of assembly code which performed
53 * one transformation before dispatching to the next link in the chain.
54 *
55 * The current reference implementation pushes almost all code generation
56 * responsibility to (trusted) Java code. A method handle contains a
57 * pointer to its "LambdaForm", which embodies all details of the method
58 * handle's behavior. The LambdaForm is a normal Java object, managed
59 * by a runtime coded in Java.
60 */
61
62 bool MethodHandles::_enabled = false; // set true after successful native linkage
63 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
64
65
66 /**
67 * Generates method handle adapters. Returns 'false' if memory allocation
68 * failed and true otherwise.
69 */
70 bool MethodHandles::generate_adapters() {
71 if (SystemDictionary::MethodHandle_klass() == NULL) {
72 return true;
73 }
74
75 assert(_adapter_code == NULL, "generate only once");
76
77 ResourceMark rm;
78 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
79 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
80 if (_adapter_code == NULL) {
81 return false;
82 }
83
84 CodeBuffer code(_adapter_code);
85 MethodHandlesAdapterGenerator g(&code);
86 g.generate();
87 code.log_section_sizes("MethodHandlesAdapterBlob");
88 return true;
89 }
90
91 //------------------------------------------------------------------------------
92 // MethodHandlesAdapterGenerator::generate
93 //
94 void MethodHandlesAdapterGenerator::generate() {
95 // Generate generic method handle adapters.
96 // Generate interpreter entries
97 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
98 mk <= Interpreter::method_handle_invoke_LAST;
99 mk = Interpreter::MethodKind(1 + (int)mk)) {
100 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
101 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
102 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
103 if (entry != NULL) {
104 Interpreter::set_entry_for_kind(mk, entry);
105 }
106 // If the entry is not set, it will throw AbstractMethodError.
107 }
108 }
109
110 void MethodHandles::set_enabled(bool z) {
111 if (_enabled != z) {
112 guarantee(z, "can only enable once");
113 _enabled = z;
114 }
115 }
116
117 // MemberName support
118
119 // import java_lang_invoke_MemberName.*
120 enum {
121 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
122 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
123 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
124 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
125 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
126 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
127 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
128 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
129 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
130 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
131 };
132
133 Handle MethodHandles::new_MemberName(TRAPS) {
134 Handle empty;
135 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
136 if (!k->is_initialized()) k->initialize(CHECK_(empty));
137 return Handle(THREAD, k->allocate_instance(THREAD));
138 }
139
140 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
141 // This method is used from java.lang.invoke.MemberName constructors.
142 // It fills in the new MemberName from a java.lang.reflect.Member.
143 Thread* thread = Thread::current();
144 oop target_oop = target();
145 Klass* target_klass = target_oop->klass();
146 if (target_klass == SystemDictionary::reflect_Field_klass()) {
147 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
148 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
149 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
150 if (!k.is_null() && k->oop_is_instance()) {
151 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
152 oop mname2 = init_field_MemberName(mname, fd);
153 if (mname2 != NULL) {
154 // Since we have the reified name and type handy, add them to the result.
155 if (java_lang_invoke_MemberName::name(mname2) == NULL)
156 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
157 if (java_lang_invoke_MemberName::type(mname2) == NULL)
158 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
159 }
160 return mname2;
161 }
162 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
163 oop clazz = java_lang_reflect_Method::clazz(target_oop);
164 int slot = java_lang_reflect_Method::slot(target_oop);
165 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
166 if (!k.is_null() && k->oop_is_instance()) {
167 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
168 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
169 return NULL; // do not resolve unless there is a concrete signature
170 CallInfo info(m, k());
171 return init_method_MemberName(mname, info);
172 }
173 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
174 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
175 int slot = java_lang_reflect_Constructor::slot(target_oop);
176 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
177 if (!k.is_null() && k->oop_is_instance()) {
178 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
179 if (m == NULL) return NULL;
180 CallInfo info(m, k());
181 return init_method_MemberName(mname, info);
182 }
183 }
184 return NULL;
185 }
186
187 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
188 assert(info.resolved_appendix().is_null(), "only normal methods here");
189 methodHandle m = info.resolved_method();
190 assert(m.not_null(), "null method handle");
191 KlassHandle m_klass = m->method_holder();
192 assert(m.not_null(), "null holder for method handle");
193 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
194 int vmindex = Method::invalid_vtable_index;
195
196 switch (info.call_kind()) {
197 case CallInfo::itable_call:
198 vmindex = info.itable_index();
199 // More importantly, the itable index only works with the method holder.
200 assert(m_klass->verify_itable_index(vmindex), "");
201 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
202 if (TraceInvokeDynamic) {
203 ResourceMark rm;
204 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
205 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
206 vmindex);
207 m->access_flags().print_on(tty);
208 if (!m->is_abstract()) {
209 tty->print("default");
210 }
211 tty->cr();
212 }
213 break;
214
215 case CallInfo::vtable_call:
216 vmindex = info.vtable_index();
217 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
218 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
219 if (m_klass->is_interface()) {
220 // This is a vtable call to an interface method (abstract "miranda method" or default method).
221 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
222 // (LinkResolver should help us figure this out.)
223 KlassHandle m_klass_non_interface = info.resolved_klass();
224 if (m_klass_non_interface->is_interface()) {
225 m_klass_non_interface = SystemDictionary::Object_klass();
226 #ifdef ASSERT
227 { ResourceMark rm;
228 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
229 assert(m->name() == m2->name() && m->signature() == m2->signature(),
230 err_msg("at %d, %s != %s", vmindex,
231 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
232 }
233 #endif //ASSERT
234 }
235 if (!m->is_public()) {
236 assert(m->is_public(), "virtual call must be to public interface method");
237 return NULL; // elicit an error later in product build
238 }
239 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
240 m_klass = m_klass_non_interface;
241 }
242 if (TraceInvokeDynamic) {
243 ResourceMark rm;
244 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
245 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
246 m_klass->internal_name(), vmindex);
247 m->access_flags().print_on(tty);
248 if (m->is_default_method()) {
249 tty->print("default");
250 }
251 tty->cr();
252 }
253 break;
254
255 case CallInfo::direct_call:
256 vmindex = Method::nonvirtual_vtable_index;
257 if (m->is_static()) {
258 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
259 } else if (m->is_initializer()) {
260 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
261 } else {
262 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
263 }
264 break;
265
266 default: assert(false, "bad CallInfo"); return NULL;
267 }
268
269 // @CallerSensitive annotation detected
270 if (m->caller_sensitive()) {
271 flags |= CALLER_SENSITIVE;
272 }
273
274 oop mname_oop = mname();
275 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
276 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
277 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
278 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
279 // Note: name and type can be lazily computed by resolve_MemberName,
280 // if Java code needs them as resolved String and MethodType objects.
281 // The clazz must be eagerly stored, because it provides a GC
282 // root to help keep alive the Method*.
283 // If relevant, the vtable or itable value is stored as vmindex.
284 // This is done eagerly, since it is readily available without
285 // constructing any new objects.
286 // TO DO: maybe intern mname_oop
287 if (m->method_holder()->add_member_name(mname)) {
288 return mname();
289 } else {
290 // Redefinition caused this to fail. Return NULL (and an exception?)
291 return NULL;
292 }
293 }
294
295 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
296 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
297 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
298 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
299 Metadata* vmtarget = fd.field_holder();
300 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
301 oop mname_oop = mname();
302 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
303 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
304 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
305 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
306 oop type = field_signature_type_or_null(fd.signature());
307 oop name = field_name_or_null(fd.name());
308 if (name != NULL)
309 java_lang_invoke_MemberName::set_name(mname_oop, name);
310 if (type != NULL)
311 java_lang_invoke_MemberName::set_type(mname_oop, type);
312 // Note: name and type can be lazily computed by resolve_MemberName,
313 // if Java code needs them as resolved String and Class objects.
314 // Note that the incoming type oop might be pre-resolved (non-null).
315 // The base clazz and field offset (vmindex) must be eagerly stored,
316 // because they unambiguously identify the field.
317 // Although the fieldDescriptor::_index would also identify the field,
318 // we do not use it, because it is harder to decode.
319 // TO DO: maybe intern mname_oop
320 return mname();
321 }
322
323 // JVM 2.9 Special Methods:
324 // A method is signature polymorphic if and only if all of the following conditions hold :
325 // * It is declared in the java.lang.invoke.MethodHandle class.
326 // * It has a single formal parameter of type Object[].
327 // * It has a return type of Object.
328 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
329 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
330 if (klass == NULL)
331 return false;
332 // The following test will fail spuriously during bootstrap of MethodHandle itself:
333 // if (klass != SystemDictionary::MethodHandle_klass())
334 // Test the name instead:
335 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
336 return false;
337 Symbol* poly_sig = vmSymbols::object_array_object_signature();
338 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
339 if (m == NULL) return false;
340 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
341 int flags = m->access_flags().as_int();
342 return (flags & required) == required;
343 }
344
345
346 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
347 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
348 switch (iid) {
349 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
350 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
351 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
352 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
353 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
354 }
355 assert(false, "");
356 return 0;
357 }
358
359 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
360 switch (iid) {
361 case vmIntrinsics::_invokeBasic: return 0;
362 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
363 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
364 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
365 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
366 }
367 assert(false, err_msg("iid=%d", iid));
368 return 0;
369 }
370
371 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
372 vmSymbols::SID name_id = vmSymbols::find_sid(name);
373 switch (name_id) {
374 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
375 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
376 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
377 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
378
379 // There is one static signature-polymorphic method for each JVM invocation mode.
380 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
381 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
382 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
383 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
384 }
385
386 // Cover the case of invokeExact and any future variants of invokeFoo.
387 Klass* mh_klass = SystemDictionary::well_known_klass(
388 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
389 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
390 return vmIntrinsics::_invokeGeneric;
391
392 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
393 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
394 return vmIntrinsics::_none;
395 }
396
397 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
398 if (klass != NULL &&
399 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
400 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
401 if (iid != vmIntrinsics::_none)
402 return iid;
403 if (is_method_handle_invoke_name(klass, name))
404 return vmIntrinsics::_invokeGeneric;
405 }
406 return vmIntrinsics::_none;
407 }
408
409
410 // convert the external string or reflective type to an internal signature
411 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
412 if (java_lang_invoke_MethodType::is_instance(type_str)) {
413 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
414 } else if (java_lang_Class::is_instance(type_str)) {
415 return java_lang_Class::as_signature(type_str, false, THREAD);
416 } else if (java_lang_String::is_instance_inlined(type_str)) {
417 if (intern_if_not_found) {
418 return java_lang_String::as_symbol(type_str, THREAD);
419 } else {
420 return java_lang_String::as_symbol_or_null(type_str);
421 }
422 } else {
423 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
424 }
425 }
426
427 static const char OBJ_SIG[] = "Ljava/lang/Object;";
428 enum { OBJ_SIG_LEN = 18 };
429
430 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
431 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
432 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
433 const int len = sig->utf8_length();
434 for (int i = 0; i < len; i++) {
435 switch (sig->byte_at(i)) {
436 case 'L':
437 // only java/lang/Object is valid here
438 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
439 return false;
440 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
441 continue;
442 case '(': case ')': case 'V':
443 case 'I': case 'J': case 'F': case 'D':
444 continue;
445 //case '[':
446 //case 'Z': case 'B': case 'C': case 'S':
447 default:
448 return false;
449 }
450 }
451 return true;
452 }
453
454 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
455 Symbol* bsig = NULL;
456 if (sig == NULL) {
457 return sig;
458 } else if (is_basic_type_signature(sig)) {
459 sig->increment_refcount();
460 return sig; // that was easy
461 } else if (sig->byte_at(0) != '(') {
462 BasicType bt = char2type(sig->byte_at(0));
463 if (is_subword_type(bt)) {
464 bsig = vmSymbols::int_signature();
465 } else {
466 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
467 bsig = vmSymbols::object_signature();
468 }
469 } else {
470 ResourceMark rm;
471 stringStream buffer(128);
472 buffer.put('(');
473 int arg_pos = 0, keep_arg_pos = -1;
474 if (keep_last_arg)
475 keep_arg_pos = ArgumentCount(sig).size() - 1;
476 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
477 BasicType bt = ss.type();
478 size_t this_arg_pos = buffer.size();
479 if (ss.at_return_type()) {
480 buffer.put(')');
481 }
482 if (arg_pos == keep_arg_pos) {
483 buffer.write((char*) ss.raw_bytes(),
484 (int) ss.raw_length());
485 } else if (bt == T_OBJECT || bt == T_ARRAY) {
486 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
487 } else {
488 if (is_subword_type(bt))
489 bt = T_INT;
490 buffer.put(type2char(bt));
491 }
492 arg_pos++;
493 }
494 const char* sigstr = buffer.base();
495 int siglen = (int) buffer.size();
496 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
497 }
498 assert(is_basic_type_signature(bsig) ||
499 // detune assert in case the injected argument is not a basic type:
500 keep_last_arg, "");
501 return bsig;
502 }
503
504 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
505 Symbol* sig,
506 bool keep_arrays,
507 bool keep_basic_names) {
508 st = st ? st : tty;
509 int len = sig->utf8_length();
510 int array = 0;
511 bool prev_type = false;
512 for (int i = 0; i < len; i++) {
513 char ch = sig->byte_at(i);
514 switch (ch) {
515 case '(': case ')':
516 prev_type = false;
517 st->put(ch);
518 continue;
519 case '[':
520 if (!keep_basic_names && keep_arrays)
521 st->put(ch);
522 array++;
523 continue;
524 case 'L':
525 {
526 if (prev_type) st->put(',');
527 int start = i+1, slash = start;
528 while (++i < len && (ch = sig->byte_at(i)) != ';') {
529 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
530 }
531 if (slash < i) start = slash;
532 if (!keep_basic_names) {
533 st->put('L');
534 } else {
535 for (int j = start; j < i; j++)
536 st->put(sig->byte_at(j));
537 prev_type = true;
538 }
539 break;
540 }
541 default:
542 {
543 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
544 ch = '[';
545 array = 0;
546 }
547 if (prev_type) st->put(',');
548 const char* n = NULL;
549 if (keep_basic_names)
550 n = type2name(char2type(ch));
551 if (n == NULL) {
552 // unknown letter, or we don't want to know its name
553 st->put(ch);
554 } else {
555 st->print("%s", n);
556 prev_type = true;
557 }
558 break;
559 }
560 }
561 // Switch break goes here to take care of array suffix:
562 if (prev_type) {
563 while (array > 0) {
564 st->print("[]");
565 --array;
566 }
567 }
568 array = 0;
569 }
570 }
571
572
573
574 static oop object_java_mirror() {
575 return SystemDictionary::Object_klass()->java_mirror();
576 }
577
578 oop MethodHandles::field_name_or_null(Symbol* s) {
579 if (s == NULL) return NULL;
580 return StringTable::lookup(s);
581 }
582
583 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
584 if (s == NULL) return NULL;
585 BasicType bt = FieldType::basic_type(s);
586 if (is_java_primitive(bt)) {
587 assert(s->utf8_length() == 1, "");
588 return java_lang_Class::primitive_mirror(bt);
589 }
590 // Here are some more short cuts for common types.
591 // They are optional, since reference types can be resolved lazily.
592 if (bt == T_OBJECT) {
593 if (s == vmSymbols::object_signature()) {
594 return object_java_mirror();
595 } else if (s == vmSymbols::class_signature()) {
596 return SystemDictionary::Class_klass()->java_mirror();
597 } else if (s == vmSymbols::string_signature()) {
598 return SystemDictionary::String_klass()->java_mirror();
599 }
600 }
601 return NULL;
602 }
603
604
605 // An unresolved member name is a mere symbolic reference.
606 // Resolving it plants a vmtarget/vmindex in it,
607 // which refers directly to JVM internals.
608 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
609 Handle empty;
610 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
611
612 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
613 // Already resolved.
614 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
615 assert(vmindex >= Method::nonvirtual_vtable_index, "");
616 return mname;
617 }
618
619 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
620 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
621 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
622 int flags = java_lang_invoke_MemberName::flags(mname());
623 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
624 if (!ref_kind_is_valid(ref_kind)) {
625 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
626 }
627
628 DEBUG_ONLY(int old_vmindex);
629 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
630
631 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
632 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
633 }
634
635 instanceKlassHandle defc;
636 {
637 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
638 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
639 if (!defc_klass->oop_is_instance()) {
640 if (!defc_klass->oop_is_array()) return empty;
641 defc_klass = SystemDictionary::Object_klass();
642 }
643 defc = instanceKlassHandle(THREAD, defc_klass);
644 }
645 if (defc.is_null()) {
646 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
647 }
648 defc->link_class(CHECK_(empty)); // possible safepoint
649
650 // convert the external string name to an internal symbol
651 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
652 if (name == NULL) return empty; // no such name
653 if (name == vmSymbols::class_initializer_name())
654 return empty; // illegal name
655
656 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
657 if ((flags & ALL_KINDS) == IS_METHOD &&
658 (defc() == SystemDictionary::MethodHandle_klass()) &&
659 (ref_kind == JVM_REF_invokeVirtual ||
660 ref_kind == JVM_REF_invokeSpecial ||
661 // static invocation mode is required for _linkToVirtual, etc.:
662 ref_kind == JVM_REF_invokeStatic)) {
663 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
664 if (iid != vmIntrinsics::_none &&
665 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
666 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
667 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
668 mh_invoke_id = iid;
669 }
670 }
671
672 // convert the external string or reflective type to an internal signature
673 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
674 if (type == NULL) return empty; // no such signature exists in the VM
675
676 // Time to do the lookup.
677 switch (flags & ALL_KINDS) {
678 case IS_METHOD:
679 {
680 CallInfo result;
681 LinkInfo link_info(defc, name, type, caller, caller.not_null());
682 {
683 assert(!HAS_PENDING_EXCEPTION, "");
684 if (ref_kind == JVM_REF_invokeStatic) {
685 LinkResolver::resolve_static_call(result,
686 link_info, false, THREAD);
687 } else if (ref_kind == JVM_REF_invokeInterface) {
688 LinkResolver::resolve_interface_call(result, Handle(), defc,
689 link_info, false, THREAD);
690 } else if (mh_invoke_id != vmIntrinsics::_none) {
691 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
692 LinkResolver::resolve_handle_call(result, link_info, THREAD);
693 } else if (ref_kind == JVM_REF_invokeSpecial) {
694 LinkResolver::resolve_special_call(result,
695 link_info, THREAD);
696 } else if (ref_kind == JVM_REF_invokeVirtual) {
697 LinkResolver::resolve_virtual_call(result, Handle(), defc,
698 link_info, false, THREAD);
699 } else {
700 assert(false, err_msg("ref_kind=%d", ref_kind));
701 }
702 if (HAS_PENDING_EXCEPTION) {
703 return empty;
704 }
705 }
706 if (result.resolved_appendix().not_null()) {
707 // The resolved MemberName must not be accompanied by an appendix argument,
708 // since there is no way to bind this value into the MemberName.
709 // Caller is responsible to prevent this from happening.
710 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
711 }
712 oop mname2 = init_method_MemberName(mname, result);
713 return Handle(THREAD, mname2);
714 }
715 case IS_CONSTRUCTOR:
716 {
717 CallInfo result;
718 LinkInfo link_info(defc, name, type, caller, caller.not_null());
719 {
720 assert(!HAS_PENDING_EXCEPTION, "");
721 if (name == vmSymbols::object_initializer_name()) {
722 LinkResolver::resolve_special_call(result, link_info, THREAD);
723 } else {
724 break; // will throw after end of switch
725 }
726 if (HAS_PENDING_EXCEPTION) {
727 return empty;
728 }
729 }
730 assert(result.is_statically_bound(), "");
731 oop mname2 = init_method_MemberName(mname, result);
732 return Handle(THREAD, mname2);
733 }
734 case IS_FIELD:
735 {
736 fieldDescriptor result; // find_field initializes fd if found
737 {
738 assert(!HAS_PENDING_EXCEPTION, "");
739 LinkInfo link_info(defc, name, type, caller, /*check_access*/false);
740 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
741 if (HAS_PENDING_EXCEPTION) {
742 return empty;
743 }
744 }
745 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
746 return Handle(THREAD, mname2);
747 }
748 default:
749 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
750 }
751
752 return empty;
753 }
754
755 // Conversely, a member name which is only initialized from JVM internals
756 // may have null defc, name, and type fields.
757 // Resolving it plants a vmtarget/vmindex in it,
758 // which refers directly to JVM internals.
759 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
760 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
761 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
762 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
763 if (vmtarget == NULL) {
764 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
765 }
766
767 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
768 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
769 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
770 int flags = java_lang_invoke_MemberName::flags(mname());
771
772 if (suppress != 0) {
773 if (suppress & _suppress_defc) have_defc = true;
774 if (suppress & _suppress_name) have_name = true;
775 if (suppress & _suppress_type) have_type = true;
776 }
777
778 if (have_defc && have_name && have_type) return; // nothing needed
779
780 switch (flags & ALL_KINDS) {
781 case IS_METHOD:
782 case IS_CONSTRUCTOR:
783 {
784 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
785 methodHandle m(THREAD, (Method*)vmtarget);
786 DEBUG_ONLY(vmtarget = NULL); // safety
787 if (m.is_null()) break;
788 if (!have_defc) {
789 InstanceKlass* defc = m->method_holder();
790 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
791 }
792 if (!have_name) {
793 //not java_lang_String::create_from_symbol; let's intern member names
794 Handle name = StringTable::intern(m->name(), CHECK);
795 java_lang_invoke_MemberName::set_name(mname(), name());
796 }
797 if (!have_type) {
798 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
799 java_lang_invoke_MemberName::set_type(mname(), type());
800 }
801 return;
802 }
803 case IS_FIELD:
804 {
805 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
806 if (!((Klass*) vmtarget)->oop_is_instance()) break;
807 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
808 DEBUG_ONLY(vmtarget = NULL); // safety
809 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
810 fieldDescriptor fd; // find_field initializes fd if found
811 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
812 break; // cannot expand
813 if (!have_defc) {
814 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
815 }
816 if (!have_name) {
817 //not java_lang_String::create_from_symbol; let's intern member names
818 Handle name = StringTable::intern(fd.name(), CHECK);
819 java_lang_invoke_MemberName::set_name(mname(), name());
820 }
821 if (!have_type) {
822 // If it is a primitive field type, don't mess with short strings like "I".
823 Handle type = field_signature_type_or_null(fd.signature());
824 if (type.is_null()) {
825 java_lang_String::create_from_symbol(fd.signature(), CHECK);
826 }
827 java_lang_invoke_MemberName::set_type(mname(), type());
828 }
829 return;
830 }
831 }
832 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
833 }
834
835 int MethodHandles::find_MemberNames(KlassHandle k,
836 Symbol* name, Symbol* sig,
837 int mflags, KlassHandle caller,
838 int skip, objArrayHandle results) {
839 // %%% take caller into account!
840
841 Thread* thread = Thread::current();
842
843 if (k.is_null() || !k->oop_is_instance()) return -1;
844
845 int rfill = 0, rlimit = results->length(), rskip = skip;
846 // overflow measurement:
847 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
848
849 int match_flags = mflags;
850 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
851 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
852 bool local_only = !(search_superc | search_intfc);
853 bool classes_only = false;
854
855 if (name != NULL) {
856 if (name->utf8_length() == 0) return 0; // a match is not possible
857 }
858 if (sig != NULL) {
859 if (sig->utf8_length() == 0) return 0; // a match is not possible
860 if (sig->byte_at(0) == '(')
861 match_flags &= ~(IS_FIELD | IS_TYPE);
862 else
863 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
864 }
865
866 if ((match_flags & IS_TYPE) != 0) {
867 // NYI, and Core Reflection works quite well for this query
868 }
869
870 if ((match_flags & IS_FIELD) != 0) {
871 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
872 if (name != NULL && st.name() != name)
873 continue;
874 if (sig != NULL && st.signature() != sig)
875 continue;
876 // passed the filters
877 if (rskip > 0) {
878 --rskip;
879 } else if (rfill < rlimit) {
880 Handle result(thread, results->obj_at(rfill++));
881 if (!java_lang_invoke_MemberName::is_instance(result()))
882 return -99; // caller bug!
883 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
884 if (saved != result())
885 results->obj_at_put(rfill-1, saved); // show saved instance to user
886 } else if (++overflow >= overflow_limit) {
887 match_flags = 0; break; // got tired of looking at overflow
888 }
889 }
890 }
891
892 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
893 // watch out for these guys:
894 Symbol* init_name = vmSymbols::object_initializer_name();
895 Symbol* clinit_name = vmSymbols::class_initializer_name();
896 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
897 bool negate_name_test = false;
898 // fix name so that it captures the intention of IS_CONSTRUCTOR
899 if (!(match_flags & IS_METHOD)) {
900 // constructors only
901 if (name == NULL) {
902 name = init_name;
903 } else if (name != init_name) {
904 return 0; // no constructors of this method name
905 }
906 } else if (!(match_flags & IS_CONSTRUCTOR)) {
907 // methods only
908 if (name == NULL) {
909 name = init_name;
910 negate_name_test = true; // if we see the name, we *omit* the entry
911 } else if (name == init_name) {
912 return 0; // no methods of this constructor name
913 }
914 } else {
915 // caller will accept either sort; no need to adjust name
916 }
917 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
918 Method* m = st.method();
919 Symbol* m_name = m->name();
920 if (m_name == clinit_name)
921 continue;
922 if (name != NULL && ((m_name != name) ^ negate_name_test))
923 continue;
924 if (sig != NULL && m->signature() != sig)
925 continue;
926 // passed the filters
927 if (rskip > 0) {
928 --rskip;
929 } else if (rfill < rlimit) {
930 Handle result(thread, results->obj_at(rfill++));
931 if (!java_lang_invoke_MemberName::is_instance(result()))
932 return -99; // caller bug!
933 CallInfo info(m);
934 oop saved = MethodHandles::init_method_MemberName(result, info);
935 if (saved != result())
936 results->obj_at_put(rfill-1, saved); // show saved instance to user
937 } else if (++overflow >= overflow_limit) {
938 match_flags = 0; break; // got tired of looking at overflow
939 }
940 }
941 }
942
943 // return number of elements we at leasted wanted to initialize
944 return rfill + overflow;
945 }
946
947 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
948 assert_locked_or_safepoint(CodeCache_lock);
949
950 oop context = java_lang_invoke_CallSite::context(call_site);
951 nmethodBucket* deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
952
953 nmethodBucket* new_deps = nmethodBucket::add_dependent_nmethod(deps, nm);
954 if (deps != new_deps) {
955 java_lang_invoke_MethodHandleNatives_CallSiteContext::set_vmdependencies(context, new_deps);
956 }
957 }
958
959 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
960 assert_locked_or_safepoint(CodeCache_lock);
961
962 oop context = java_lang_invoke_CallSite::context(call_site);
963 nmethodBucket* deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
964
965 if (nmethodBucket::remove_dependent_nmethod(deps, nm)) {
966 nmethodBucket* new_deps = nmethodBucket::clean_dependent_nmethods(deps);
967 if (deps != new_deps) {
968 java_lang_invoke_MethodHandleNatives_CallSiteContext::set_vmdependencies(context, new_deps);
969 }
970 }
971 }
972
973 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
974 assert_lock_strong(Compile_lock);
975
976 int marked = 0;
977 CallSiteDepChange changes(call_site(), target());
978 {
979 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
980
981 oop context = java_lang_invoke_CallSite::context(call_site());
982 nmethodBucket* deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
983
984 marked = nmethodBucket::mark_dependent_nmethods(deps, changes);
985 if (marked > 0) {
986 nmethodBucket* new_deps = nmethodBucket::clean_dependent_nmethods(deps);
987 if (deps != new_deps) {
988 java_lang_invoke_MethodHandleNatives_CallSiteContext::set_vmdependencies(context, new_deps);
989 }
990 }
991 }
992 if (marked > 0) {
993 // At least one nmethod has been marked for deoptimization
994 VM_Deoptimize op;
995 VMThread::execute(&op);
996 }
997 }
998
999 //------------------------------------------------------------------------------
1000 // MemberNameTable
1001 //
1002
1003 MemberNameTable::MemberNameTable(int methods_cnt)
1004 : GrowableArray<jweak>(methods_cnt, true) {
1005 assert_locked_or_safepoint(MemberNameTable_lock);
1006 }
1007
1008 MemberNameTable::~MemberNameTable() {
1009 assert_locked_or_safepoint(MemberNameTable_lock);
1010 int len = this->length();
1011
1012 for (int idx = 0; idx < len; idx++) {
1013 jweak ref = this->at(idx);
1014 JNIHandles::destroy_weak_global(ref);
1015 }
1016 }
1017
1018 void MemberNameTable::add_member_name(jweak mem_name_wref) {
1019 assert_locked_or_safepoint(MemberNameTable_lock);
1020 this->push(mem_name_wref);
1021 }
1022
1023 #if INCLUDE_JVMTI
1024 // It is called at safepoint only for RedefineClasses
1025 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) {
1026 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
1027 // For each redefined method
1028 for (int idx = 0; idx < length(); idx++) {
1029 oop mem_name = JNIHandles::resolve(this->at(idx));
1030 if (mem_name == NULL) {
1031 continue;
1032 }
1033 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
1034
1035 if (old_method == NULL || !old_method->is_old()) {
1036 continue; // skip uninteresting entries
1037 }
1038 if (old_method->is_deleted()) {
1039 // skip entries with deleted methods
1040 continue;
1041 }
1042 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum());
1043
1044 assert(new_method != NULL, "method_with_idnum() should not be NULL");
1045 assert(old_method != new_method, "sanity check");
1046
1047 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method);
1048
1049 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1050 if (!(*trace_name_printed)) {
1051 // RC_TRACE_MESG macro has an embedded ResourceMark
1052 RC_TRACE_MESG(("adjust: name=%s",
1053 old_method->method_holder()->external_name()));
1054 *trace_name_printed = true;
1055 }
1056 // RC_TRACE macro has an embedded ResourceMark
1057 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
1058 new_method->name()->as_C_string(),
1059 new_method->signature()->as_C_string()));
1060 }
1061 }
1062 }
1063 #endif // INCLUDE_JVMTI
1064
1065 //
1066 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1067 // They are the private interface between this JVM and the HotSpot-specific
1068 // Java code that implements JSR 292 method handles.
1069 //
1070 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1071 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1072 //
1073
1074 #ifndef PRODUCT
1075 #define EACH_NAMED_CON(template, requirement) \
1076 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1077 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1078 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1079 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1080 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1081 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1082 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1083 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1084 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1085 /*end*/
1086
1087 #define IGNORE_REQ(req_expr) /* req_expr */
1088 #define ONE_PLUS(scope,value) 1+
1089 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1090 #define VALUE_COMMA(scope,value) scope::value,
1091 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1092 #define STRING_NULL(scope,value) #value "\0"
1093 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1094
1095 static bool advertise_con_value(int which) {
1096 if (which < 0) return false;
1097 bool ok = true;
1098 int count = 0;
1099 #define INC_COUNT(scope,value) \
1100 ++count;
1101 #define CHECK_REQ(req_expr) \
1102 if (which < count) return ok; \
1103 ok = (req_expr);
1104 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1105 #undef INC_COUNT
1106 #undef CHECK_REQ
1107 assert(count == con_value_count, "");
1108 if (which < count) return ok;
1109 return false;
1110 }
1111
1112 #undef ONE_PLUS
1113 #undef VALUE_COMMA
1114 #undef STRING_NULL
1115 #undef EACH_NAMED_CON
1116 #endif // PRODUCT
1117
1118 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1119 #ifndef PRODUCT
1120 if (advertise_con_value(which)) {
1121 assert(which >= 0 && which < con_value_count, "");
1122 int con = con_values[which];
1123 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1124 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1125 const char* str = &con_names[0];
1126 for (int i = 0; i < which; i++)
1127 str += strlen(str) + 1; // skip name and null
1128 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1129 box->obj_at_put(0, name);
1130 }
1131 return con;
1132 }
1133 #endif
1134 return 0;
1135 }
1136 JVM_END
1137
1138 // void init(MemberName self, AccessibleObject ref)
1139 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1140 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1141 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1142 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1143 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1144 MethodHandles::init_MemberName(mname, target);
1145 }
1146 JVM_END
1147
1148 // void expand(MemberName self)
1149 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1150 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1151 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1152 MethodHandles::expand_MemberName(mname, 0, CHECK);
1153 }
1154 JVM_END
1155
1156 // void resolve(MemberName self, Class<?> caller)
1157 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1158 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1159 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1160
1161 // The trusted Java code that calls this method should already have performed
1162 // access checks on behalf of the given caller. But, we can verify this.
1163 if (VerifyMethodHandles && caller_jh != NULL &&
1164 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1165 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1166 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1167 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1168 }
1169
1170 // Reflection::verify_class_access can only handle instance classes.
1171 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1172 // Emulate LinkResolver::check_klass_accessability.
1173 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1174 if (!Reflection::verify_class_access(caller,
1175 reference_klass,
1176 true)) {
1177 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1178 }
1179 }
1180 }
1181
1182 KlassHandle caller(THREAD,
1183 caller_jh == NULL ? (Klass*) NULL :
1184 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1185 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1186
1187 if (resolved.is_null()) {
1188 int flags = java_lang_invoke_MemberName::flags(mname());
1189 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1190 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1191 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1192 }
1193 if ((flags & ALL_KINDS) == IS_FIELD) {
1194 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1195 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1196 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1197 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1198 } else {
1199 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1200 }
1201 }
1202
1203 return JNIHandles::make_local(THREAD, resolved());
1204 }
1205 JVM_END
1206
1207 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1208 if (mname == NULL ||
1209 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1210 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1211 } else {
1212 int flags = java_lang_invoke_MemberName::flags(mname);
1213 if ((flags & IS_FIELD) != 0 &&
1214 (must_be_static
1215 ? (flags & JVM_ACC_STATIC) != 0
1216 : (flags & JVM_ACC_STATIC) == 0)) {
1217 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1218 bool is_final = (flags & JVM_ACC_FINAL) != 0;
1219 return Unsafe::field_offset_from_byte_offset(vmindex, is_final);
1220 }
1221 }
1222 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1223 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1224 return 0;
1225 }
1226
1227 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1228 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1229 }
1230 JVM_END
1231
1232 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1233 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1234 }
1235 JVM_END
1236
1237 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1238 // use the other function to perform sanity checks:
1239 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1240 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1241 return JNIHandles::make_local(THREAD, clazz);
1242 }
1243 JVM_END
1244
1245 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1246 if (mname_jh == NULL) return NULL;
1247 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1248 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1249 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1250 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1251 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1252 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1253 result->obj_at_put(0, x);
1254 x = NULL;
1255 if (vmtarget == NULL) {
1256 x = NULL;
1257 } else if (vmtarget->is_klass()) {
1258 x = ((Klass*) vmtarget)->java_mirror();
1259 } else if (vmtarget->is_method()) {
1260 x = mname();
1261 }
1262 result->obj_at_put(1, x);
1263 return JNIHandles::make_local(env, result());
1264 }
1265 JVM_END
1266
1267
1268
1269 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1270 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1271 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1272 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1273 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1274 if (clazz_jh == NULL || results_jh == NULL) return -1;
1275 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1276
1277 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1278 if (results.is_null() || !results->is_objArray()) return -1;
1279
1280 TempNewSymbol name = NULL;
1281 TempNewSymbol sig = NULL;
1282 if (name_jh != NULL) {
1283 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1284 if (name == NULL) return 0; // a match is not possible
1285 }
1286 if (sig_jh != NULL) {
1287 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1288 if (sig == NULL) return 0; // a match is not possible
1289 }
1290
1291 KlassHandle caller;
1292 if (caller_jh != NULL) {
1293 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1294 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1295 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1296 }
1297
1298 if (name != NULL && sig != NULL && results.not_null()) {
1299 // try a direct resolve
1300 // %%% TO DO
1301 }
1302
1303 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1304 caller, skip, results);
1305 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1306 return res;
1307 }
1308 JVM_END
1309
1310 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1311 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1312 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1313 {
1314 // Walk all nmethods depending on this call site.
1315 MutexLocker mu(Compile_lock, thread);
1316 MethodHandles::flush_dependent_nmethods(call_site, target);
1317 java_lang_invoke_CallSite::set_target(call_site(), target());
1318 }
1319 }
1320 JVM_END
1321
1322 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1323 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1324 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1325 {
1326 // Walk all nmethods depending on this call site.
1327 MutexLocker mu(Compile_lock, thread);
1328 MethodHandles::flush_dependent_nmethods(call_site, target);
1329 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1330 }
1331 }
1332 JVM_END
1333
1334 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1335 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1336 {
1337 // Walk all nmethods depending on this call site.
1338 MutexLocker mu1(Compile_lock, thread);
1339
1340 int marked = 0;
1341 {
1342 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1343 nmethodBucket* b = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1344 marked = nmethodBucket::release(b);
1345 java_lang_invoke_MethodHandleNatives_CallSiteContext::set_vmdependencies(context(), NULL); // reset context
1346 }
1347 if (marked > 0) {
1348 // At least one nmethod has been marked for deoptimization
1349 VM_Deoptimize op;
1350 VMThread::execute(&op);
1351 }
1352 }
1353 }
1354 JVM_END
1355
1356 /**
1357 * Throws a java/lang/UnsupportedOperationException unconditionally.
1358 * This is required by the specification of MethodHandle.invoke if
1359 * invoked directly.
1360 */
1361 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1362 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1363 return NULL;
1364 }
1365 JVM_END
1366
1367 /**
1368 * Throws a java/lang/UnsupportedOperationException unconditionally.
1369 * This is required by the specification of MethodHandle.invokeExact if
1370 * invoked directly.
1371 */
1372 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1373 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1374 return NULL;
1375 }
1376 JVM_END
1377
1378 /// JVM_RegisterMethodHandleMethods
1379
1380 #undef CS // Solaris builds complain
1381
1382 #define LANG "Ljava/lang/"
1383 #define JLINV "Ljava/lang/invoke/"
1384
1385 #define OBJ LANG"Object;"
1386 #define CLS LANG"Class;"
1387 #define STRG LANG"String;"
1388 #define CS JLINV"CallSite;"
1389 #define MT JLINV"MethodType;"
1390 #define MH JLINV"MethodHandle;"
1391 #define MEM JLINV"MemberName;"
1392 #define CTX JLINV"MethodHandleNatives$CallSiteContext;"
1393
1394 #define CC (char*) /*cast a literal from (const char*)*/
1395 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1396
1397 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1398 static JNINativeMethod MHN_methods[] = {
1399 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1400 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1401 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1402 // static native int getNamedCon(int which, Object[] name)
1403 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1404 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1405 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1406 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1407 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1408 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1409 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1410 {CC"clearCallSiteContext", CC"("CTX")V", FN_PTR(MHN_clearCallSiteContext)},
1411 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1412 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1413 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1414 };
1415
1416 static JNINativeMethod MH_methods[] = {
1417 // UnsupportedOperationException throwers
1418 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1419 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1420 };
1421
1422 /**
1423 * Helper method to register native methods.
1424 */
1425 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1426 int status = env->RegisterNatives(clazz, methods, nMethods);
1427 if (status != JNI_OK || env->ExceptionOccurred()) {
1428 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1429 env->ExceptionClear();
1430 return false;
1431 }
1432 return true;
1433 }
1434
1435 /**
1436 * This one function is exported, used by NativeLookup.
1437 */
1438 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1439 assert(!MethodHandles::enabled(), "must not be enabled");
1440 bool enable_MH = true;
1441
1442 jclass MH_class = NULL;
1443 if (SystemDictionary::MethodHandle_klass() == NULL) {
1444 enable_MH = false;
1445 } else {
1446 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1447 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1448 }
1449
1450 if (enable_MH) {
1451 ThreadToNativeFromVM ttnfv(thread);
1452
1453 if (enable_MH) {
1454 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1455 }
1456 if (enable_MH) {
1457 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1458 }
1459 }
1460
1461 if (TraceInvokeDynamic) {
1462 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1463 }
1464
1465 if (enable_MH) {
1466 if (MethodHandles::generate_adapters() == false) {
1467 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters");
1468 }
1469 MethodHandles::set_enabled(true);
1470 }
1471 }
1472 JVM_END