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/symbolTable.hpp"
27 #include "compiler/compileBroker.hpp"
28 #include "interpreter/interpreter.hpp"
29 #include "interpreter/oopMapCache.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "prims/methodHandles.hpp"
33 #include "prims/jvmtiRedefineClassesTrace.hpp"
34 #include "runtime/compilationPolicy.hpp"
35 #include "runtime/javaCalls.hpp"
36 #include "runtime/reflection.hpp"
37 #include "runtime/signature.hpp"
38 #include "runtime/stubRoutines.hpp"
39
40
41 /*
42 * JSR 292 reference implementation: method handles
43 * The JDK 7 reference implementation represented method handle
44 * combinations as chains. Each link in the chain had a "vmentry"
45 * field which pointed at a bit of assembly code which performed
46 * one transformation before dispatching to the next link in the chain.
47 *
48 * The current reference implementation pushes almost all code generation
49 * responsibility to (trusted) Java code. A method handle contains a
50 * pointer to its "LambdaForm", which embodies all details of the method
51 * handle's behavior. The LambdaForm is a normal Java object, managed
52 * by a runtime coded in Java.
53 */
54
55 bool MethodHandles::_enabled = false; // set true after successful native linkage
56 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
57
58 //------------------------------------------------------------------------------
59 // MethodHandles::generate_adapters
60 //
61 void MethodHandles::generate_adapters() {
62 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
63
64 assert(_adapter_code == NULL, "generate only once");
65
66 ResourceMark rm;
67 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
68 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
69 if (_adapter_code == NULL)
70 vm_exit_out_of_memory(adapter_code_size, OOM_MALLOC_ERROR,
71 "CodeCache: no room for MethodHandles adapters");
72 {
73 CodeBuffer code(_adapter_code);
74 MethodHandlesAdapterGenerator g(&code);
75 g.generate();
76 code.log_section_sizes("MethodHandlesAdapterBlob");
77 }
78 }
79
80 //------------------------------------------------------------------------------
81 // MethodHandlesAdapterGenerator::generate
82 //
83 void MethodHandlesAdapterGenerator::generate() {
84 // Generate generic method handle adapters.
85 // Generate interpreter entries
86 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
87 mk <= Interpreter::method_handle_invoke_LAST;
88 mk = Interpreter::MethodKind(1 + (int)mk)) {
89 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
90 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
91 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
92 if (entry != NULL) {
93 Interpreter::set_entry_for_kind(mk, entry);
94 }
95 // If the entry is not set, it will throw AbstractMethodError.
96 }
97 }
98
99 void MethodHandles::set_enabled(bool z) {
100 if (_enabled != z) {
101 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
102 _enabled = z;
103 }
104 }
105
106 // MemberName support
107
108 // import java_lang_invoke_MemberName.*
109 enum {
110 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
111 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
112 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
113 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
114 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
115 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
116 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
117 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
118 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
119 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
120 };
121
122 Handle MethodHandles::new_MemberName(TRAPS) {
123 Handle empty;
124 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
125 if (!k->is_initialized()) k->initialize(CHECK_(empty));
126 return Handle(THREAD, k->allocate_instance(THREAD));
127 }
128
129 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
130 // This method is used from java.lang.invoke.MemberName constructors.
131 // It fills in the new MemberName from a java.lang.reflect.Member.
132 Thread* thread = Thread::current();
133 oop target_oop = target();
134 Klass* target_klass = target_oop->klass();
135 if (target_klass == SystemDictionary::reflect_Field_klass()) {
136 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
137 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
138 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
139 if (!k.is_null() && k->oop_is_instance()) {
140 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
141 oop mname2 = init_field_MemberName(mname, fd);
142 if (mname2 != NULL) {
143 // Since we have the reified name and type handy, add them to the result.
144 if (java_lang_invoke_MemberName::name(mname2) == NULL)
145 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
146 if (java_lang_invoke_MemberName::type(mname2) == NULL)
147 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
148 }
149 return mname2;
150 }
151 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
152 oop clazz = java_lang_reflect_Method::clazz(target_oop);
153 int slot = java_lang_reflect_Method::slot(target_oop);
154 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
155 if (!k.is_null() && k->oop_is_instance()) {
156 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
157 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
158 return NULL; // do not resolve unless there is a concrete signature
159 CallInfo info(m, k());
160 return init_method_MemberName(mname, info);
161 }
162 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
163 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
164 int slot = java_lang_reflect_Constructor::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) return NULL;
169 CallInfo info(m, k());
170 return init_method_MemberName(mname, info);
171 }
172 }
173 return NULL;
174 }
175
176 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info, bool intern) {
177 assert(info.resolved_appendix().is_null(), "only normal methods here");
178 methodHandle m = info.resolved_method();
179 KlassHandle m_klass = m->method_holder();
180 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
181 int vmindex = Method::invalid_vtable_index;
182
183 switch (info.call_kind()) {
184 case CallInfo::itable_call:
185 vmindex = info.itable_index();
186 // More importantly, the itable index only works with the method holder.
187 assert(m_klass->verify_itable_index(vmindex), "");
188 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
189 if (TraceInvokeDynamic) {
190 ResourceMark rm;
191 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
192 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
193 vmindex);
194 m->access_flags().print_on(tty);
195 if (!m->is_abstract()) {
196 tty->print("default");
197 }
198 tty->cr();
199 }
200 break;
201
202 case CallInfo::vtable_call:
203 vmindex = info.vtable_index();
204 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
205 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
206 if (m_klass->is_interface()) {
207 // This is a vtable call to an interface method (abstract "miranda method" or default method).
208 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
209 // (LinkResolver should help us figure this out.)
210 KlassHandle m_klass_non_interface = info.resolved_klass();
211 if (m_klass_non_interface->is_interface()) {
212 m_klass_non_interface = SystemDictionary::Object_klass();
213 #ifdef ASSERT
214 { ResourceMark rm;
215 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
216 assert(m->name() == m2->name() && m->signature() == m2->signature(),
217 err_msg("at %d, %s != %s", vmindex,
218 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
219 }
220 #endif //ASSERT
221 }
222 if (!m->is_public()) {
223 assert(m->is_public(), "virtual call must be to public interface method");
224 return NULL; // elicit an error later in product build
225 }
226 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
227 m_klass = m_klass_non_interface;
228 }
229 if (TraceInvokeDynamic) {
230 ResourceMark rm;
231 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
232 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
233 m_klass->internal_name(), vmindex);
234 m->access_flags().print_on(tty);
235 if (m->is_default_method()) {
236 tty->print("default");
237 }
238 tty->cr();
239 }
240 break;
241
242 case CallInfo::direct_call:
243 vmindex = Method::nonvirtual_vtable_index;
244 if (m->is_static()) {
245 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
246 } else if (m->is_initializer()) {
247 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
248 } else {
249 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
250 }
251 break;
252
253 default: assert(false, "bad CallInfo"); return NULL;
254 }
255
256 // @CallerSensitive annotation detected
257 if (m->caller_sensitive()) {
258 flags |= CALLER_SENSITIVE;
259 }
260
261 oop mname_oop = mname();
262 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
263 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
264 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
265 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
266 // Note: name and type can be lazily computed by resolve_MemberName,
267 // if Java code needs them as resolved String and MethodType objects.
268 // The clazz must be eagerly stored, because it provides a GC
269 // root to help keep alive the Method*.
270 // If relevant, the vtable or itable value is stored as vmindex.
271 // This is done eagerly, since it is readily available without
272 // constructing any new objects.
273 return m->method_holder()->add_member_name(mname, intern);
274 }
275
276 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
277 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
278 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
279 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
280 Metadata* vmtarget = fd.field_holder();
281 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
282 oop mname_oop = mname();
283 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
284 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
285 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
286 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
287 oop type = field_signature_type_or_null(fd.signature());
288 oop name = field_name_or_null(fd.name());
289 if (name != NULL)
290 java_lang_invoke_MemberName::set_name(mname_oop, name);
291 if (type != NULL)
292 java_lang_invoke_MemberName::set_type(mname_oop, type);
293 // Note: name and type can be lazily computed by resolve_MemberName,
294 // if Java code needs them as resolved String and Class objects.
295 // Note that the incoming type oop might be pre-resolved (non-null).
296 // The base clazz and field offset (vmindex) must be eagerly stored,
297 // because they unambiguously identify the field.
298 // Although the fieldDescriptor::_index would also identify the field,
299 // we do not use it, because it is harder to decode.
300 // TO DO: maybe intern mname_oop
301 return mname();
302 }
303
304 // JVM 2.9 Special Methods:
305 // A method is signature polymorphic if and only if all of the following conditions hold :
306 // * It is declared in the java.lang.invoke.MethodHandle class.
307 // * It has a single formal parameter of type Object[].
308 // * It has a return type of Object.
309 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
310 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
311 if (klass == NULL)
312 return false;
313 // The following test will fail spuriously during bootstrap of MethodHandle itself:
314 // if (klass != SystemDictionary::MethodHandle_klass())
315 // Test the name instead:
316 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
317 return false;
318 Symbol* poly_sig = vmSymbols::object_array_object_signature();
319 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
320 if (m == NULL) return false;
321 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
322 int flags = m->access_flags().as_int();
323 return (flags & required) == required;
324 }
325
326
327 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
328 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
329 switch (iid) {
330 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
331 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
332 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
333 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
334 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
335 }
336 assert(false, "");
337 return 0;
338 }
339
340 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
341 switch (iid) {
342 case vmIntrinsics::_invokeBasic: return 0;
343 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
344 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
345 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
346 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
347 }
348 assert(false, err_msg("iid=%d", iid));
349 return 0;
350 }
351
352 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
353 vmSymbols::SID name_id = vmSymbols::find_sid(name);
354 switch (name_id) {
355 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
356 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
357 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
358 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
359
360 // There is one static signature-polymorphic method for each JVM invocation mode.
361 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
362 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
363 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
364 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
365 }
366
367 // Cover the case of invokeExact and any future variants of invokeFoo.
368 Klass* mh_klass = SystemDictionary::well_known_klass(
369 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
370 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
371 return vmIntrinsics::_invokeGeneric;
372
373 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
374 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
375 return vmIntrinsics::_none;
376 }
377
378 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
379 if (klass != NULL &&
380 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
381 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
382 if (iid != vmIntrinsics::_none)
383 return iid;
384 if (is_method_handle_invoke_name(klass, name))
385 return vmIntrinsics::_invokeGeneric;
386 }
387 return vmIntrinsics::_none;
388 }
389
390
391 // convert the external string or reflective type to an internal signature
392 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
393 if (java_lang_invoke_MethodType::is_instance(type_str)) {
394 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
395 } else if (java_lang_Class::is_instance(type_str)) {
396 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
397 } else if (java_lang_String::is_instance(type_str)) {
398 if (intern_if_not_found) {
399 return java_lang_String::as_symbol(type_str, CHECK_NULL);
400 } else {
401 return java_lang_String::as_symbol_or_null(type_str);
402 }
403 } else {
404 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
405 }
406 }
407
408 static const char OBJ_SIG[] = "Ljava/lang/Object;";
409 enum { OBJ_SIG_LEN = 18 };
410
411 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
412 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
413 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
414 const int len = sig->utf8_length();
415 for (int i = 0; i < len; i++) {
416 switch (sig->byte_at(i)) {
417 case 'L':
418 // only java/lang/Object is valid here
419 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
420 return false;
421 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
422 continue;
423 case '(': case ')': case 'V':
424 case 'I': case 'J': case 'F': case 'D':
425 continue;
426 //case '[':
427 //case 'Z': case 'B': case 'C': case 'S':
428 default:
429 return false;
430 }
431 }
432 return true;
433 }
434
435 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
436 Symbol* bsig = NULL;
437 if (sig == NULL) {
438 return sig;
439 } else if (is_basic_type_signature(sig)) {
440 sig->increment_refcount();
441 return sig; // that was easy
442 } else if (sig->byte_at(0) != '(') {
443 BasicType bt = char2type(sig->byte_at(0));
444 if (is_subword_type(bt)) {
445 bsig = vmSymbols::int_signature();
446 } else {
447 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
448 bsig = vmSymbols::object_signature();
449 }
450 } else {
451 ResourceMark rm;
452 stringStream buffer(128);
453 buffer.put('(');
454 int arg_pos = 0, keep_arg_pos = -1;
455 if (keep_last_arg)
456 keep_arg_pos = ArgumentCount(sig).size() - 1;
457 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
458 BasicType bt = ss.type();
459 size_t this_arg_pos = buffer.size();
460 if (ss.at_return_type()) {
461 buffer.put(')');
462 }
463 if (arg_pos == keep_arg_pos) {
464 buffer.write((char*) ss.raw_bytes(),
465 (int) ss.raw_length());
466 } else if (bt == T_OBJECT || bt == T_ARRAY) {
467 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
468 } else {
469 if (is_subword_type(bt))
470 bt = T_INT;
471 buffer.put(type2char(bt));
472 }
473 arg_pos++;
474 }
475 const char* sigstr = buffer.base();
476 int siglen = (int) buffer.size();
477 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
478 }
479 assert(is_basic_type_signature(bsig) ||
480 // detune assert in case the injected argument is not a basic type:
481 keep_last_arg, "");
482 return bsig;
483 }
484
485 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
486 Symbol* sig,
487 bool keep_arrays,
488 bool keep_basic_names) {
489 st = st ? st : tty;
490 int len = sig->utf8_length();
491 int array = 0;
492 bool prev_type = false;
493 for (int i = 0; i < len; i++) {
494 char ch = sig->byte_at(i);
495 switch (ch) {
496 case '(': case ')':
497 prev_type = false;
498 st->put(ch);
499 continue;
500 case '[':
501 if (!keep_basic_names && keep_arrays)
502 st->put(ch);
503 array++;
504 continue;
505 case 'L':
506 {
507 if (prev_type) st->put(',');
508 int start = i+1, slash = start;
509 while (++i < len && (ch = sig->byte_at(i)) != ';') {
510 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
511 }
512 if (slash < i) start = slash;
513 if (!keep_basic_names) {
514 st->put('L');
515 } else {
516 for (int j = start; j < i; j++)
517 st->put(sig->byte_at(j));
518 prev_type = true;
519 }
520 break;
521 }
522 default:
523 {
524 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
525 ch = '[';
526 array = 0;
527 }
528 if (prev_type) st->put(',');
529 const char* n = NULL;
530 if (keep_basic_names)
531 n = type2name(char2type(ch));
532 if (n == NULL) {
533 // unknown letter, or we don't want to know its name
534 st->put(ch);
535 } else {
536 st->print("%s", n);
537 prev_type = true;
538 }
539 break;
540 }
541 }
542 // Switch break goes here to take care of array suffix:
543 if (prev_type) {
544 while (array > 0) {
545 st->print("[]");
546 --array;
547 }
548 }
549 array = 0;
550 }
551 }
552
553
554
555 static oop object_java_mirror() {
556 return SystemDictionary::Object_klass()->java_mirror();
557 }
558
559 oop MethodHandles::field_name_or_null(Symbol* s) {
560 if (s == NULL) return NULL;
561 return StringTable::lookup(s);
562 }
563
564 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
565 if (s == NULL) return NULL;
566 BasicType bt = FieldType::basic_type(s);
567 if (is_java_primitive(bt)) {
568 assert(s->utf8_length() == 1, "");
569 return java_lang_Class::primitive_mirror(bt);
570 }
571 // Here are some more short cuts for common types.
572 // They are optional, since reference types can be resolved lazily.
573 if (bt == T_OBJECT) {
574 if (s == vmSymbols::object_signature()) {
575 return object_java_mirror();
576 } else if (s == vmSymbols::class_signature()) {
577 return SystemDictionary::Class_klass()->java_mirror();
578 } else if (s == vmSymbols::string_signature()) {
579 return SystemDictionary::String_klass()->java_mirror();
580 }
581 }
582 return NULL;
583 }
584
585
586 // An unresolved member name is a mere symbolic reference.
587 // Resolving it plants a vmtarget/vmindex in it,
588 // which refers directly to JVM internals.
589 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
590 Handle empty;
591 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
592
593 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
594 // Already resolved.
595 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
596 assert(vmindex >= Method::nonvirtual_vtable_index, "");
597 return mname;
598 }
599
600 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
601 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
602 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
603 int flags = java_lang_invoke_MemberName::flags(mname());
604 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
605 if (!ref_kind_is_valid(ref_kind)) {
606 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
607 }
608
609 DEBUG_ONLY(int old_vmindex);
610 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
611
612 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
613 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
614 }
615
616 instanceKlassHandle defc;
617 {
618 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
619 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
620 if (!defc_klass->oop_is_instance()) {
621 if (!defc_klass->oop_is_array()) return empty;
622 defc_klass = SystemDictionary::Object_klass();
623 }
624 defc = instanceKlassHandle(THREAD, defc_klass);
625 }
626 if (defc.is_null()) {
627 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
628 }
629 defc->link_class(CHECK_(empty)); // possible safepoint
630
631 // convert the external string name to an internal symbol
632 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
633 if (name == NULL) return empty; // no such name
634 if (name == vmSymbols::class_initializer_name())
635 return empty; // illegal name
636
637 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
638 if ((flags & ALL_KINDS) == IS_METHOD &&
639 (defc() == SystemDictionary::MethodHandle_klass()) &&
640 (ref_kind == JVM_REF_invokeVirtual ||
641 ref_kind == JVM_REF_invokeSpecial ||
642 // static invocation mode is required for _linkToVirtual, etc.:
643 ref_kind == JVM_REF_invokeStatic)) {
644 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
645 if (iid != vmIntrinsics::_none &&
646 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
647 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
648 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
649 mh_invoke_id = iid;
650 }
651 }
652
653 // convert the external string or reflective type to an internal signature
654 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
655 if (type == NULL) return empty; // no such signature exists in the VM
656
657 // Time to do the lookup.
658 switch (flags & ALL_KINDS) {
659 case IS_METHOD:
660 {
661 CallInfo result;
662 {
663 assert(!HAS_PENDING_EXCEPTION, "");
664 if (ref_kind == JVM_REF_invokeStatic) {
665 LinkResolver::resolve_static_call(result,
666 defc, name, type, caller, caller.not_null(), false, THREAD);
667 } else if (ref_kind == JVM_REF_invokeInterface) {
668 LinkResolver::resolve_interface_call(result, Handle(), defc,
669 defc, name, type, caller, caller.not_null(), false, THREAD);
670 } else if (mh_invoke_id != vmIntrinsics::_none) {
671 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
672 LinkResolver::resolve_handle_call(result,
673 defc, name, type, caller, THREAD);
674 } else if (ref_kind == JVM_REF_invokeSpecial) {
675 LinkResolver::resolve_special_call(result,
676 Handle(), defc, name, type, caller, caller.not_null(), THREAD);
677 } else if (ref_kind == JVM_REF_invokeVirtual) {
678 LinkResolver::resolve_virtual_call(result, Handle(), defc,
679 defc, name, type, caller, caller.not_null(), false, THREAD);
680 } else {
681 assert(false, err_msg("ref_kind=%d", ref_kind));
682 }
683 if (HAS_PENDING_EXCEPTION) {
684 return empty;
685 }
686 }
687 if (result.resolved_appendix().not_null()) {
688 // The resolved MemberName must not be accompanied by an appendix argument,
689 // since there is no way to bind this value into the MemberName.
690 // Caller is responsible to prevent this from happening.
691 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
692 }
693 oop mname2 = init_method_MemberName(mname, result);
694 return Handle(THREAD, mname2);
695 }
696 case IS_CONSTRUCTOR:
697 {
698 CallInfo result;
699 {
700 assert(!HAS_PENDING_EXCEPTION, "");
701 if (name == vmSymbols::object_initializer_name()) {
702 LinkResolver::resolve_special_call(result,
703 Handle(), defc, name, type, caller, caller.not_null(), THREAD);
704 } else {
705 break; // will throw after end of switch
706 }
707 if (HAS_PENDING_EXCEPTION) {
708 return empty;
709 }
710 }
711 assert(result.is_statically_bound(), "");
712 oop mname2 = init_method_MemberName(mname, result);
713 return Handle(THREAD, mname2);
714 }
715 case IS_FIELD:
716 {
717 fieldDescriptor result; // find_field initializes fd if found
718 {
719 assert(!HAS_PENDING_EXCEPTION, "");
720 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD);
721 if (HAS_PENDING_EXCEPTION) {
722 return empty;
723 }
724 }
725 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
726 return Handle(THREAD, mname2);
727 }
728 default:
729 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
730 }
731
732 return empty;
733 }
734
735 // Conversely, a member name which is only initialized from JVM internals
736 // may have null defc, name, and type fields.
737 // Resolving it plants a vmtarget/vmindex in it,
738 // which refers directly to JVM internals.
739 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
740 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
741 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
742 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
743 if (vmtarget == NULL) {
744 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
745 }
746
747 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
748 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
749 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
750 int flags = java_lang_invoke_MemberName::flags(mname());
751
752 if (suppress != 0) {
753 if (suppress & _suppress_defc) have_defc = true;
754 if (suppress & _suppress_name) have_name = true;
755 if (suppress & _suppress_type) have_type = true;
756 }
757
758 if (have_defc && have_name && have_type) return; // nothing needed
759
760 switch (flags & ALL_KINDS) {
761 case IS_METHOD:
762 case IS_CONSTRUCTOR:
763 {
764 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
765 methodHandle m(THREAD, (Method*)vmtarget);
766 DEBUG_ONLY(vmtarget = NULL); // safety
767 if (m.is_null()) break;
768 if (!have_defc) {
769 InstanceKlass* defc = m->method_holder();
770 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
771 }
772 if (!have_name) {
773 //not java_lang_String::create_from_symbol; let's intern member names
774 Handle name = StringTable::intern(m->name(), CHECK);
775 java_lang_invoke_MemberName::set_name(mname(), name());
776 }
777 if (!have_type) {
778 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
779 java_lang_invoke_MemberName::set_type(mname(), type());
780 }
781 return;
782 }
783 case IS_FIELD:
784 {
785 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
786 if (!((Klass*) vmtarget)->oop_is_instance()) break;
787 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
788 DEBUG_ONLY(vmtarget = NULL); // safety
789 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
790 fieldDescriptor fd; // find_field initializes fd if found
791 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
792 break; // cannot expand
793 if (!have_defc) {
794 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
795 }
796 if (!have_name) {
797 //not java_lang_String::create_from_symbol; let's intern member names
798 Handle name = StringTable::intern(fd.name(), CHECK);
799 java_lang_invoke_MemberName::set_name(mname(), name());
800 }
801 if (!have_type) {
802 // If it is a primitive field type, don't mess with short strings like "I".
803 Handle type = field_signature_type_or_null(fd.signature());
804 if (type.is_null()) {
805 java_lang_String::create_from_symbol(fd.signature(), CHECK);
806 }
807 java_lang_invoke_MemberName::set_type(mname(), type());
808 }
809 return;
810 }
811 }
812 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
813 }
814
815 int MethodHandles::find_MemberNames(KlassHandle k,
816 Symbol* name, Symbol* sig,
817 int mflags, KlassHandle caller,
818 int skip, objArrayHandle results) {
819 // %%% take caller into account!
820
821 Thread* thread = Thread::current();
822
823 if (k.is_null() || !k->oop_is_instance()) return -1;
824
825 int rfill = 0, rlimit = results->length(), rskip = skip;
826 // overflow measurement:
827 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
828
829 int match_flags = mflags;
830 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
831 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
832 bool local_only = !(search_superc | search_intfc);
833 bool classes_only = false;
834
835 if (name != NULL) {
836 if (name->utf8_length() == 0) return 0; // a match is not possible
837 }
838 if (sig != NULL) {
839 if (sig->utf8_length() == 0) return 0; // a match is not possible
840 if (sig->byte_at(0) == '(')
841 match_flags &= ~(IS_FIELD | IS_TYPE);
842 else
843 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
844 }
845
846 if ((match_flags & IS_TYPE) != 0) {
847 // NYI, and Core Reflection works quite well for this query
848 }
849
850 if ((match_flags & IS_FIELD) != 0) {
851 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
852 if (name != NULL && st.name() != name)
853 continue;
854 if (sig != NULL && st.signature() != sig)
855 continue;
856 // passed the filters
857 if (rskip > 0) {
858 --rskip;
859 } else if (rfill < rlimit) {
860 Handle result(thread, results->obj_at(rfill++));
861 if (!java_lang_invoke_MemberName::is_instance(result()))
862 return -99; // caller bug!
863 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
864 if (saved != result())
865 results->obj_at_put(rfill-1, saved); // show saved instance to user
866 } else if (++overflow >= overflow_limit) {
867 match_flags = 0; break; // got tired of looking at overflow
868 }
869 }
870 }
871
872 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
873 // watch out for these guys:
874 Symbol* init_name = vmSymbols::object_initializer_name();
875 Symbol* clinit_name = vmSymbols::class_initializer_name();
876 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
877 bool negate_name_test = false;
878 // fix name so that it captures the intention of IS_CONSTRUCTOR
879 if (!(match_flags & IS_METHOD)) {
880 // constructors only
881 if (name == NULL) {
882 name = init_name;
883 } else if (name != init_name) {
884 return 0; // no constructors of this method name
885 }
886 } else if (!(match_flags & IS_CONSTRUCTOR)) {
887 // methods only
888 if (name == NULL) {
889 name = init_name;
890 negate_name_test = true; // if we see the name, we *omit* the entry
891 } else if (name == init_name) {
892 return 0; // no methods of this constructor name
893 }
894 } else {
895 // caller will accept either sort; no need to adjust name
896 }
897 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
898 Method* m = st.method();
899 Symbol* m_name = m->name();
900 if (m_name == clinit_name)
901 continue;
902 if (name != NULL && ((m_name != name) ^ negate_name_test))
903 continue;
904 if (sig != NULL && m->signature() != sig)
905 continue;
906 // passed the filters
907 if (rskip > 0) {
908 --rskip;
909 } else if (rfill < rlimit) {
910 Handle result(thread, results->obj_at(rfill++));
911 if (!java_lang_invoke_MemberName::is_instance(result()))
912 return -99; // caller bug!
913 CallInfo info(m);
914 // Since this is going through the methods to create MemberNames, don't search
915 // for matching methods already in the table
916 oop saved = MethodHandles::init_method_MemberName(result, info, /*intern*/false);
917 if (saved != result())
918 results->obj_at_put(rfill-1, saved); // show saved instance to user
919 } else if (++overflow >= overflow_limit) {
920 match_flags = 0; break; // got tired of looking at overflow
921 }
922 }
923 }
924
925 // return number of elements we at leasted wanted to initialize
926 return rfill + overflow;
927 }
928
929 //------------------------------------------------------------------------------
930 // MemberNameTable
931 //
932
933 MemberNameTable::MemberNameTable(int methods_cnt)
934 : GrowableArray<jweak>(methods_cnt, true) {
935 assert_locked_or_safepoint(MemberNameTable_lock);
936 }
937
938 MemberNameTable::~MemberNameTable() {
939 assert_locked_or_safepoint(MemberNameTable_lock);
940 int len = this->length();
941
942 for (int idx = 0; idx < len; idx++) {
943 jweak ref = this->at(idx);
944 JNIHandles::destroy_weak_global(ref);
945 }
946 }
947
948 oop MemberNameTable::add_member_name(jweak mem_name_wref) {
949 assert_locked_or_safepoint(MemberNameTable_lock);
950 this->push(mem_name_wref);
951 return JNIHandles::resolve(mem_name_wref);
952 }
953
954 oop MemberNameTable::find_or_add_member_name(jweak mem_name_wref) {
955 assert_locked_or_safepoint(MemberNameTable_lock);
956 oop new_mem_name = JNIHandles::resolve(mem_name_wref);
957
958 // Find matching member name in the list.
959 // This is linear because these are short lists.
960 int len = this->length();
961 int new_index = len;
962 for (int idx = 0; idx < len; idx++) {
963 oop mname = JNIHandles::resolve(this->at(idx));
964 if (mname == NULL) {
965 new_index = idx;
966 continue;
967 }
968 if (java_lang_invoke_MemberName::equals(new_mem_name, mname)) {
969 JNIHandles::destroy_weak_global(mem_name_wref);
970 return mname;
971 }
972 }
973 // Not found, push the new one, or reuse empty slot
974 this->at_put_grow(new_index, mem_name_wref);
975 return new_mem_name;
976 }
977
978 #if INCLUDE_JVMTI
979 // It is called at safepoint only for RedefineClasses
980 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) {
981 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
982 // For each redefined method
983 for (int idx = 0; idx < length(); idx++) {
984 oop mem_name = JNIHandles::resolve(this->at(idx));
985 if (mem_name == NULL) {
986 continue;
987 }
988 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
989
990 if (old_method == NULL || !old_method->is_old()) {
991 continue; // skip uninteresting entries
992 }
993 if (old_method->is_deleted()) {
994 // skip entries with deleted methods
995 continue;
996 }
997 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum());
998
999 assert(new_method != NULL, "method_with_idnum() should not be NULL");
1000 assert(old_method != new_method, "sanity check");
1001
1002 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method);
1003
1004 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1005 if (!(*trace_name_printed)) {
1006 // RC_TRACE_MESG macro has an embedded ResourceMark
1007 RC_TRACE_MESG(("adjust: name=%s",
1008 old_method->method_holder()->external_name()));
1009 *trace_name_printed = true;
1010 }
1011 // RC_TRACE macro has an embedded ResourceMark
1012 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
1013 new_method->name()->as_C_string(),
1014 new_method->signature()->as_C_string()));
1015 }
1016 }
1017 }
1018 #endif // INCLUDE_JVMTI
1019
1020 //
1021 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1022 // They are the private interface between this JVM and the HotSpot-specific
1023 // Java code that implements JSR 292 method handles.
1024 //
1025 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1026 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1027 //
1028
1029 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
1030 switch (which) {
1031 case MethodHandles::GC_COUNT_GWT:
1032 #ifdef COMPILER2
1033 return true;
1034 #else
1035 return false;
1036 #endif
1037 }
1038 return 0;
1039 }
1040 JVM_END
1041
1042 #ifndef PRODUCT
1043 #define EACH_NAMED_CON(template, requirement) \
1044 template(MethodHandles,GC_COUNT_GWT) \
1045 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1046 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1047 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1048 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1049 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1050 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1051 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1052 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1053 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1054 template(MethodHandles,GC_LAMBDA_SUPPORT) \
1055 /*end*/
1056
1057 #define IGNORE_REQ(req_expr) /* req_expr */
1058 #define ONE_PLUS(scope,value) 1+
1059 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1060 #define VALUE_COMMA(scope,value) scope::value,
1061 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1062 #define STRING_NULL(scope,value) #value "\0"
1063 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1064
1065 static bool advertise_con_value(int which) {
1066 if (which < 0) return false;
1067 bool ok = true;
1068 int count = 0;
1069 #define INC_COUNT(scope,value) \
1070 ++count;
1071 #define CHECK_REQ(req_expr) \
1072 if (which < count) return ok; \
1073 ok = (req_expr);
1074 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1075 #undef INC_COUNT
1076 #undef CHECK_REQ
1077 assert(count == con_value_count, "");
1078 if (which < count) return ok;
1079 return false;
1080 }
1081
1082 #undef ONE_PLUS
1083 #undef VALUE_COMMA
1084 #undef STRING_NULL
1085 #undef EACH_NAMED_CON
1086 #endif // PRODUCT
1087
1088 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1089 #ifndef PRODUCT
1090 if (advertise_con_value(which)) {
1091 assert(which >= 0 && which < con_value_count, "");
1092 int con = con_values[which];
1093 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1094 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1095 const char* str = &con_names[0];
1096 for (int i = 0; i < which; i++)
1097 str += strlen(str) + 1; // skip name and null
1098 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1099 box->obj_at_put(0, name);
1100 }
1101 return con;
1102 }
1103 #endif
1104 return 0;
1105 }
1106 JVM_END
1107
1108 // void init(MemberName self, AccessibleObject ref)
1109 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1110 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1111 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1112 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1113 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1114 MethodHandles::init_MemberName(mname, target);
1115 }
1116 JVM_END
1117
1118 // void expand(MemberName self)
1119 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1120 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1121 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1122 MethodHandles::expand_MemberName(mname, 0, CHECK);
1123 }
1124 JVM_END
1125
1126 // void resolve(MemberName self, Class<?> caller)
1127 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1128 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1129 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1130
1131 // The trusted Java code that calls this method should already have performed
1132 // access checks on behalf of the given caller. But, we can verify this.
1133 if (VerifyMethodHandles && caller_jh != NULL &&
1134 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1135 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1136 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1137 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1138 }
1139
1140 // Reflection::verify_class_access can only handle instance classes.
1141 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1142 // Emulate LinkResolver::check_klass_accessability.
1143 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1144 if (!Reflection::verify_class_access(caller,
1145 reference_klass,
1146 true)) {
1147 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1148 }
1149 }
1150 }
1151
1152 KlassHandle caller(THREAD,
1153 caller_jh == NULL ? (Klass*) NULL :
1154 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1155 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1156
1157 if (resolved.is_null()) {
1158 int flags = java_lang_invoke_MemberName::flags(mname());
1159 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1160 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1161 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1162 }
1163 if ((flags & ALL_KINDS) == IS_FIELD) {
1164 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1165 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1166 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1167 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1168 } else {
1169 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1170 }
1171 }
1172
1173 return JNIHandles::make_local(THREAD, resolved());
1174 }
1175 JVM_END
1176
1177 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1178 if (mname == NULL ||
1179 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1180 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1181 } else {
1182 int flags = java_lang_invoke_MemberName::flags(mname);
1183 if ((flags & IS_FIELD) != 0 &&
1184 (must_be_static
1185 ? (flags & JVM_ACC_STATIC) != 0
1186 : (flags & JVM_ACC_STATIC) == 0)) {
1187 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1188 return (jlong) vmindex;
1189 }
1190 }
1191 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1192 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1193 return 0;
1194 }
1195
1196 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1197 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1198 }
1199 JVM_END
1200
1201 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1202 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1203 }
1204 JVM_END
1205
1206 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1207 // use the other function to perform sanity checks:
1208 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1209 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1210 return JNIHandles::make_local(THREAD, clazz);
1211 }
1212 JVM_END
1213
1214 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1215 if (mname_jh == NULL) return NULL;
1216 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1217 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1218 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1219 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1220 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1221 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1222 result->obj_at_put(0, x);
1223 x = NULL;
1224 if (vmtarget == NULL) {
1225 x = NULL;
1226 } else if (vmtarget->is_klass()) {
1227 x = ((Klass*) vmtarget)->java_mirror();
1228 } else if (vmtarget->is_method()) {
1229 x = mname();
1230 }
1231 result->obj_at_put(1, x);
1232 return JNIHandles::make_local(env, result());
1233 }
1234 JVM_END
1235
1236
1237
1238 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1239 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1240 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1241 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1242 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1243 if (clazz_jh == NULL || results_jh == NULL) return -1;
1244 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1245
1246 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1247 if (results.is_null() || !results->is_objArray()) return -1;
1248
1249 TempNewSymbol name = NULL;
1250 TempNewSymbol sig = NULL;
1251 if (name_jh != NULL) {
1252 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1253 if (name == NULL) return 0; // a match is not possible
1254 }
1255 if (sig_jh != NULL) {
1256 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1257 if (sig == NULL) return 0; // a match is not possible
1258 }
1259
1260 KlassHandle caller;
1261 if (caller_jh != NULL) {
1262 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1263 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1264 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1265 }
1266
1267 if (name != NULL && sig != NULL && results.not_null()) {
1268 // try a direct resolve
1269 // %%% TO DO
1270 }
1271
1272 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1273 caller, skip, results);
1274 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1275 return res;
1276 }
1277 JVM_END
1278
1279 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1280 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1281 Handle target (THREAD, JNIHandles::resolve(target_jh));
1282 {
1283 // Walk all nmethods depending on this call site.
1284 MutexLocker mu(Compile_lock, thread);
1285 Universe::flush_dependents_on(call_site, target);
1286 java_lang_invoke_CallSite::set_target(call_site(), target());
1287 }
1288 }
1289 JVM_END
1290
1291 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1292 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1293 Handle target (THREAD, JNIHandles::resolve(target_jh));
1294 {
1295 // Walk all nmethods depending on this call site.
1296 MutexLocker mu(Compile_lock, thread);
1297 Universe::flush_dependents_on(call_site, target);
1298 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1299 }
1300 }
1301 JVM_END
1302
1303 /**
1304 * Throws a java/lang/UnsupportedOperationException unconditionally.
1305 * This is required by the specification of MethodHandle.invoke if
1306 * invoked directly.
1307 */
1308 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1309 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1310 return NULL;
1311 }
1312 JVM_END
1313
1314 /**
1315 * Throws a java/lang/UnsupportedOperationException unconditionally.
1316 * This is required by the specification of MethodHandle.invokeExact if
1317 * invoked directly.
1318 */
1319 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1320 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1321 return NULL;
1322 }
1323 JVM_END
1324
1325 /// JVM_RegisterMethodHandleMethods
1326
1327 #undef CS // Solaris builds complain
1328
1329 #define LANG "Ljava/lang/"
1330 #define JLINV "Ljava/lang/invoke/"
1331
1332 #define OBJ LANG "Object;"
1333 #define CLS LANG "Class;"
1334 #define STRG LANG "String;"
1335 #define CS JLINV "CallSite;"
1336 #define MT JLINV "MethodType;"
1337 #define MH JLINV "MethodHandle;"
1338 #define MEM JLINV "MemberName;"
1339
1340 #define CC (char*) /*cast a literal from (const char*)*/
1341 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1342
1343 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1344 static JNINativeMethod MHN_methods[] = {
1345 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1346 {CC"expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1347 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)},
1348 {CC "getConstant", CC "(I)I", FN_PTR(MHN_getConstant)},
1349 // static native int getNamedCon(int which, Object[] name)
1350 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1351 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1352 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1353 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1354 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1355 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1356 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1357 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1358 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1359 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1360 };
1361
1362 static JNINativeMethod MH_methods[] = {
1363 // UnsupportedOperationException throwers
1364 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1365 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1366 };
1367
1368 /**
1369 * Helper method to register native methods.
1370 */
1371 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1372 int status = env->RegisterNatives(clazz, methods, nMethods);
1373 if (status != JNI_OK || env->ExceptionOccurred()) {
1374 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1375 env->ExceptionClear();
1376 return false;
1377 }
1378 return true;
1379 }
1380
1381 /**
1382 * This one function is exported, used by NativeLookup.
1383 */
1384 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1385 if (!EnableInvokeDynamic) {
1386 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
1387 return; // bind nothing
1388 }
1389
1390 assert(!MethodHandles::enabled(), "must not be enabled");
1391 bool enable_MH = true;
1392
1393 jclass MH_class = NULL;
1394 if (SystemDictionary::MethodHandle_klass() == NULL) {
1395 enable_MH = false;
1396 } else {
1397 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1398 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1399 }
1400
1401 if (enable_MH) {
1402 ThreadToNativeFromVM ttnfv(thread);
1403
1404 if (enable_MH) {
1405 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1406 }
1407 if (enable_MH) {
1408 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1409 }
1410 }
1411
1412 if (TraceInvokeDynamic) {
1413 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1414 }
1415
1416 if (enable_MH) {
1417 MethodHandles::generate_adapters();
1418 MethodHandles::set_enabled(true);
1419 }
1420 }
1421 JVM_END