1 /*
2 * Copyright (c) 2008, 2014, 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/stringTable.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/jvmtiRedefineClassesTrace.hpp"
33 #include "prims/methodHandles.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 (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, "can only enable once");
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) {
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
274 return mname();
275 }
276
277 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
278 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
279 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
280 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
281 Metadata* vmtarget = fd.field_holder();
282 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
283 oop mname_oop = mname();
284 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
285 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
286 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
287 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
288 oop type = field_signature_type_or_null(fd.signature());
289 oop name = field_name_or_null(fd.name());
290 if (name != NULL)
291 java_lang_invoke_MemberName::set_name(mname_oop, name);
292 if (type != NULL)
293 java_lang_invoke_MemberName::set_type(mname_oop, type);
294 // Note: name and type can be lazily computed by resolve_MemberName,
295 // if Java code needs them as resolved String and Class objects.
296 // Note that the incoming type oop might be pre-resolved (non-null).
297 // The base clazz and field offset (vmindex) must be eagerly stored,
298 // because they unambiguously identify the field.
299 // Although the fieldDescriptor::_index would also identify the field,
300 // we do not use it, because it is harder to decode.
301 // TO DO: maybe intern mname_oop
302 return mname();
303 }
304
305 // JVM 2.9 Special Methods:
306 // A method is signature polymorphic if and only if all of the following conditions hold :
307 // * It is declared in the java.lang.invoke.MethodHandle class.
308 // * It has a single formal parameter of type Object[].
309 // * It has a return type of Object.
310 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
311 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
312 if (klass == NULL)
313 return false;
314 // The following test will fail spuriously during bootstrap of MethodHandle itself:
315 // if (klass != SystemDictionary::MethodHandle_klass())
316 // Test the name instead:
317 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
318 return false;
319 Symbol* poly_sig = vmSymbols::object_array_object_signature();
320 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
321 if (m == NULL) return false;
322 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
323 int flags = m->access_flags().as_int();
324 return (flags & required) == required;
325 }
326
327
328 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
329 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
330 switch (iid) {
331 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
332 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
333 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
334 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
335 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
336 }
337 assert(false, "");
338 return 0;
339 }
340
341 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
342 switch (iid) {
343 case vmIntrinsics::_invokeBasic: return 0;
344 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
345 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
346 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
347 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
348 }
349 assert(false, err_msg("iid=%d", iid));
350 return 0;
351 }
352
353 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
354 vmSymbols::SID name_id = vmSymbols::find_sid(name);
355 switch (name_id) {
356 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
357 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
358 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
359 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
360
361 // There is one static signature-polymorphic method for each JVM invocation mode.
362 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
363 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
364 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
365 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
366 }
367
368 // Cover the case of invokeExact and any future variants of invokeFoo.
369 Klass* mh_klass = SystemDictionary::well_known_klass(
370 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
371 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
372 return vmIntrinsics::_invokeGeneric;
373
374 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
375 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
376 return vmIntrinsics::_none;
377 }
378
379 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
380 if (klass != NULL &&
381 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
382 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
383 if (iid != vmIntrinsics::_none)
384 return iid;
385 if (is_method_handle_invoke_name(klass, name))
386 return vmIntrinsics::_invokeGeneric;
387 }
388 return vmIntrinsics::_none;
389 }
390
391
392 // convert the external string or reflective type to an internal signature
393 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
394 if (java_lang_invoke_MethodType::is_instance(type_str)) {
395 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
396 } else if (java_lang_Class::is_instance(type_str)) {
397 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
398 } else if (java_lang_String::is_instance(type_str)) {
399 if (intern_if_not_found) {
400 return java_lang_String::as_symbol(type_str, CHECK_NULL);
401 } else {
402 return java_lang_String::as_symbol_or_null(type_str);
403 }
404 } else {
405 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
406 }
407 }
408
409 static const char OBJ_SIG[] = "Ljava/lang/Object;";
410 enum { OBJ_SIG_LEN = 18 };
411
412 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
413 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
414 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
415 const int len = sig->utf8_length();
416 for (int i = 0; i < len; i++) {
417 switch (sig->byte_at(i)) {
418 case 'L':
419 // only java/lang/Object is valid here
420 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
421 return false;
422 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
423 continue;
424 case '(': case ')': case 'V':
425 case 'I': case 'J': case 'F': case 'D':
426 continue;
427 //case '[':
428 //case 'Z': case 'B': case 'C': case 'S':
429 default:
430 return false;
431 }
432 }
433 return true;
434 }
435
436 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
437 Symbol* bsig = NULL;
438 if (sig == NULL) {
439 return sig;
440 } else if (is_basic_type_signature(sig)) {
441 sig->increment_refcount();
442 return sig; // that was easy
443 } else if (sig->byte_at(0) != '(') {
444 BasicType bt = char2type(sig->byte_at(0));
445 if (is_subword_type(bt)) {
446 bsig = vmSymbols::int_signature();
447 } else {
448 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
449 bsig = vmSymbols::object_signature();
450 }
451 } else {
452 ResourceMark rm;
453 stringStream buffer(128);
454 buffer.put('(');
455 int arg_pos = 0, keep_arg_pos = -1;
456 if (keep_last_arg)
457 keep_arg_pos = ArgumentCount(sig).size() - 1;
458 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
459 BasicType bt = ss.type();
460 size_t this_arg_pos = buffer.size();
461 if (ss.at_return_type()) {
462 buffer.put(')');
463 }
464 if (arg_pos == keep_arg_pos) {
465 buffer.write((char*) ss.raw_bytes(),
466 (int) ss.raw_length());
467 } else if (bt == T_OBJECT || bt == T_ARRAY) {
468 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
469 } else {
470 if (is_subword_type(bt))
471 bt = T_INT;
472 buffer.put(type2char(bt));
473 }
474 arg_pos++;
475 }
476 const char* sigstr = buffer.base();
477 int siglen = (int) buffer.size();
478 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
479 }
480 assert(is_basic_type_signature(bsig) ||
481 // detune assert in case the injected argument is not a basic type:
482 keep_last_arg, "");
483 return bsig;
484 }
485
486 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
487 Symbol* sig,
488 bool keep_arrays,
489 bool keep_basic_names) {
490 st = st ? st : tty;
491 int len = sig->utf8_length();
492 int array = 0;
493 bool prev_type = false;
494 for (int i = 0; i < len; i++) {
495 char ch = sig->byte_at(i);
496 switch (ch) {
497 case '(': case ')':
498 prev_type = false;
499 st->put(ch);
500 continue;
501 case '[':
502 if (!keep_basic_names && keep_arrays)
503 st->put(ch);
504 array++;
505 continue;
506 case 'L':
507 {
508 if (prev_type) st->put(',');
509 int start = i+1, slash = start;
510 while (++i < len && (ch = sig->byte_at(i)) != ';') {
511 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
512 }
513 if (slash < i) start = slash;
514 if (!keep_basic_names) {
515 st->put('L');
516 } else {
517 for (int j = start; j < i; j++)
518 st->put(sig->byte_at(j));
519 prev_type = true;
520 }
521 break;
522 }
523 default:
524 {
525 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
526 ch = '[';
527 array = 0;
528 }
529 if (prev_type) st->put(',');
530 const char* n = NULL;
531 if (keep_basic_names)
532 n = type2name(char2type(ch));
533 if (n == NULL) {
534 // unknown letter, or we don't want to know its name
535 st->put(ch);
536 } else {
537 st->print("%s", n);
538 prev_type = true;
539 }
540 break;
541 }
542 }
543 // Switch break goes here to take care of array suffix:
544 if (prev_type) {
545 while (array > 0) {
546 st->print("[]");
547 --array;
548 }
549 }
550 array = 0;
551 }
552 }
553
554
555
556 static oop object_java_mirror() {
557 return SystemDictionary::Object_klass()->java_mirror();
558 }
559
560 oop MethodHandles::field_name_or_null(Symbol* s) {
561 if (s == NULL) return NULL;
562 return StringTable::lookup(s);
563 }
564
565 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
566 if (s == NULL) return NULL;
567 BasicType bt = FieldType::basic_type(s);
568 if (is_java_primitive(bt)) {
569 assert(s->utf8_length() == 1, "");
570 return java_lang_Class::primitive_mirror(bt);
571 }
572 // Here are some more short cuts for common types.
573 // They are optional, since reference types can be resolved lazily.
574 if (bt == T_OBJECT) {
575 if (s == vmSymbols::object_signature()) {
576 return object_java_mirror();
577 } else if (s == vmSymbols::class_signature()) {
578 return SystemDictionary::Class_klass()->java_mirror();
579 } else if (s == vmSymbols::string_signature()) {
580 return SystemDictionary::String_klass()->java_mirror();
581 }
582 }
583 return NULL;
584 }
585
586
587 // An unresolved member name is a mere symbolic reference.
588 // Resolving it plants a vmtarget/vmindex in it,
589 // which refers directly to JVM internals.
590 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
591 Handle empty;
592 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
593
594 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
595 // Already resolved.
596 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
597 assert(vmindex >= Method::nonvirtual_vtable_index, "");
598 return mname;
599 }
600
601 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
602 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
603 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
604 int flags = java_lang_invoke_MemberName::flags(mname());
605 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
606 if (!ref_kind_is_valid(ref_kind)) {
607 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
608 }
609
610 DEBUG_ONLY(int old_vmindex);
611 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
612
613 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
614 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
615 }
616
617 instanceKlassHandle defc;
618 {
619 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
620 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
621 if (!defc_klass->oop_is_instance()) {
622 if (!defc_klass->oop_is_array()) return empty;
623 defc_klass = SystemDictionary::Object_klass();
624 }
625 defc = instanceKlassHandle(THREAD, defc_klass);
626 }
627 if (defc.is_null()) {
628 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
629 }
630 defc->link_class(CHECK_(empty)); // possible safepoint
631
632 // convert the external string name to an internal symbol
633 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
634 if (name == NULL) return empty; // no such name
635 if (name == vmSymbols::class_initializer_name())
636 return empty; // illegal name
637
638 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
639 if ((flags & ALL_KINDS) == IS_METHOD &&
640 (defc() == SystemDictionary::MethodHandle_klass()) &&
641 (ref_kind == JVM_REF_invokeVirtual ||
642 ref_kind == JVM_REF_invokeSpecial ||
643 // static invocation mode is required for _linkToVirtual, etc.:
644 ref_kind == JVM_REF_invokeStatic)) {
645 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
646 if (iid != vmIntrinsics::_none &&
647 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
648 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
649 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
650 mh_invoke_id = iid;
651 }
652 }
653
654 // convert the external string or reflective type to an internal signature
655 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
656 if (type == NULL) return empty; // no such signature exists in the VM
657
658 // Time to do the lookup.
659 switch (flags & ALL_KINDS) {
660 case IS_METHOD:
661 {
662 CallInfo result;
663 {
664 assert(!HAS_PENDING_EXCEPTION, "");
665 if (ref_kind == JVM_REF_invokeStatic) {
666 LinkResolver::resolve_static_call(result,
667 defc, name, type, caller, caller.not_null(), false, THREAD);
668 } else if (ref_kind == JVM_REF_invokeInterface) {
669 LinkResolver::resolve_interface_call(result, Handle(), defc,
670 defc, name, type, caller, caller.not_null(), false, THREAD);
671 } else if (mh_invoke_id != vmIntrinsics::_none) {
672 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
673 LinkResolver::resolve_handle_call(result,
674 defc, name, type, caller, THREAD);
675 } else if (ref_kind == JVM_REF_invokeSpecial) {
676 LinkResolver::resolve_special_call(result,
677 defc, name, type, caller, caller.not_null(), THREAD);
678 } else if (ref_kind == JVM_REF_invokeVirtual) {
679 LinkResolver::resolve_virtual_call(result, Handle(), defc,
680 defc, name, type, caller, caller.not_null(), false, THREAD);
681 } else {
682 assert(false, err_msg("ref_kind=%d", ref_kind));
683 }
684 if (HAS_PENDING_EXCEPTION) {
685 return empty;
686 }
687 }
688 if (result.resolved_appendix().not_null()) {
689 // The resolved MemberName must not be accompanied by an appendix argument,
690 // since there is no way to bind this value into the MemberName.
691 // Caller is responsible to prevent this from happening.
692 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
693 }
694 oop mname2 = init_method_MemberName(mname, result);
695 return Handle(THREAD, mname2);
696 }
697 case IS_CONSTRUCTOR:
698 {
699 CallInfo result;
700 {
701 assert(!HAS_PENDING_EXCEPTION, "");
702 if (name == vmSymbols::object_initializer_name()) {
703 LinkResolver::resolve_special_call(result,
704 defc, name, type, caller, caller.not_null(), THREAD);
705 } else {
706 break; // will throw after end of switch
707 }
708 if (HAS_PENDING_EXCEPTION) {
709 return empty;
710 }
711 }
712 assert(result.is_statically_bound(), "");
713 oop mname2 = init_method_MemberName(mname, result);
714 return Handle(THREAD, mname2);
715 }
716 case IS_FIELD:
717 {
718 fieldDescriptor result; // find_field initializes fd if found
719 {
720 assert(!HAS_PENDING_EXCEPTION, "");
721 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD);
722 if (HAS_PENDING_EXCEPTION) {
723 return empty;
724 }
725 }
726 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
727 return Handle(THREAD, mname2);
728 }
729 default:
730 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
731 }
732
733 return empty;
734 }
735
736 // Conversely, a member name which is only initialized from JVM internals
737 // may have null defc, name, and type fields.
738 // Resolving it plants a vmtarget/vmindex in it,
739 // which refers directly to JVM internals.
740 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
741 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
742 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
743 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
744 if (vmtarget == NULL) {
745 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
746 }
747
748 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
749 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
750 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
751 int flags = java_lang_invoke_MemberName::flags(mname());
752
753 if (suppress != 0) {
754 if (suppress & _suppress_defc) have_defc = true;
755 if (suppress & _suppress_name) have_name = true;
756 if (suppress & _suppress_type) have_type = true;
757 }
758
759 if (have_defc && have_name && have_type) return; // nothing needed
760
761 switch (flags & ALL_KINDS) {
762 case IS_METHOD:
763 case IS_CONSTRUCTOR:
764 {
765 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
766 methodHandle m(THREAD, (Method*)vmtarget);
767 DEBUG_ONLY(vmtarget = NULL); // safety
768 if (m.is_null()) break;
769 if (!have_defc) {
770 InstanceKlass* defc = m->method_holder();
771 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
772 }
773 if (!have_name) {
774 //not java_lang_String::create_from_symbol; let's intern member names
775 Handle name = StringTable::intern(m->name(), CHECK);
776 java_lang_invoke_MemberName::set_name(mname(), name());
777 }
778 if (!have_type) {
779 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
780 java_lang_invoke_MemberName::set_type(mname(), type());
781 }
782 return;
783 }
784 case IS_FIELD:
785 {
786 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
787 if (!((Klass*) vmtarget)->oop_is_instance()) break;
788 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
789 DEBUG_ONLY(vmtarget = NULL); // safety
790 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
791 fieldDescriptor fd; // find_field initializes fd if found
792 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
793 break; // cannot expand
794 if (!have_defc) {
795 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
796 }
797 if (!have_name) {
798 //not java_lang_String::create_from_symbol; let's intern member names
799 Handle name = StringTable::intern(fd.name(), CHECK);
800 java_lang_invoke_MemberName::set_name(mname(), name());
801 }
802 if (!have_type) {
803 // If it is a primitive field type, don't mess with short strings like "I".
804 Handle type = field_signature_type_or_null(fd.signature());
805 if (type.is_null()) {
806 java_lang_String::create_from_symbol(fd.signature(), CHECK);
807 }
808 java_lang_invoke_MemberName::set_type(mname(), type());
809 }
810 return;
811 }
812 }
813 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
814 }
815
816 int MethodHandles::find_MemberNames(KlassHandle k,
817 Symbol* name, Symbol* sig,
818 int mflags, KlassHandle caller,
819 int skip, objArrayHandle results) {
820 // %%% take caller into account!
821
822 Thread* thread = Thread::current();
823
824 if (k.is_null() || !k->oop_is_instance()) return -1;
825
826 int rfill = 0, rlimit = results->length(), rskip = skip;
827 // overflow measurement:
828 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
829
830 int match_flags = mflags;
831 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
832 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
833 bool local_only = !(search_superc | search_intfc);
834 bool classes_only = false;
835
836 if (name != NULL) {
837 if (name->utf8_length() == 0) return 0; // a match is not possible
838 }
839 if (sig != NULL) {
840 if (sig->utf8_length() == 0) return 0; // a match is not possible
841 if (sig->byte_at(0) == '(')
842 match_flags &= ~(IS_FIELD | IS_TYPE);
843 else
844 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
845 }
846
847 if ((match_flags & IS_TYPE) != 0) {
848 // NYI, and Core Reflection works quite well for this query
849 }
850
851 if ((match_flags & IS_FIELD) != 0) {
852 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
853 if (name != NULL && st.name() != name)
854 continue;
855 if (sig != NULL && st.signature() != sig)
856 continue;
857 // passed the filters
858 if (rskip > 0) {
859 --rskip;
860 } else if (rfill < rlimit) {
861 Handle result(thread, results->obj_at(rfill++));
862 if (!java_lang_invoke_MemberName::is_instance(result()))
863 return -99; // caller bug!
864 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
865 if (saved != result())
866 results->obj_at_put(rfill-1, saved); // show saved instance to user
867 } else if (++overflow >= overflow_limit) {
868 match_flags = 0; break; // got tired of looking at overflow
869 }
870 }
871 }
872
873 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
874 // watch out for these guys:
875 Symbol* init_name = vmSymbols::object_initializer_name();
876 Symbol* clinit_name = vmSymbols::class_initializer_name();
877 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
878 bool negate_name_test = false;
879 // fix name so that it captures the intention of IS_CONSTRUCTOR
880 if (!(match_flags & IS_METHOD)) {
881 // constructors only
882 if (name == NULL) {
883 name = init_name;
884 } else if (name != init_name) {
885 return 0; // no constructors of this method name
886 }
887 } else if (!(match_flags & IS_CONSTRUCTOR)) {
888 // methods only
889 if (name == NULL) {
890 name = init_name;
891 negate_name_test = true; // if we see the name, we *omit* the entry
892 } else if (name == init_name) {
893 return 0; // no methods of this constructor name
894 }
895 } else {
896 // caller will accept either sort; no need to adjust name
897 }
898 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
899 Method* m = st.method();
900 Symbol* m_name = m->name();
901 if (m_name == clinit_name)
902 continue;
903 if (name != NULL && ((m_name != name) ^ negate_name_test))
904 continue;
905 if (sig != NULL && m->signature() != sig)
906 continue;
907 // passed the filters
908 if (rskip > 0) {
909 --rskip;
910 } else if (rfill < rlimit) {
911 Handle result(thread, results->obj_at(rfill++));
912 if (!java_lang_invoke_MemberName::is_instance(result()))
913 return -99; // caller bug!
914 CallInfo info(m);
915 oop saved = MethodHandles::init_method_MemberName(result, info);
916 if (saved != result())
917 results->obj_at_put(rfill-1, saved); // show saved instance to user
918 } else if (++overflow >= overflow_limit) {
919 match_flags = 0; break; // got tired of looking at overflow
920 }
921 }
922 }
923
924 // return number of elements we at leasted wanted to initialize
925 return rfill + overflow;
926 }
927
928 //
929 // Here are the native methods in java.lang.invoke.MethodHandleNatives
930 // They are the private interface between this JVM and the HotSpot-specific
931 // Java code that implements JSR 292 method handles.
932 //
933 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
934 // that intrinsic (non-JNI) native methods are defined in HotSpot.
935 //
936
937 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
938 switch (which) {
939 case MethodHandles::GC_COUNT_GWT:
940 #ifdef COMPILER2
941 return true;
942 #else
943 return false;
944 #endif
945 }
946 return 0;
947 }
948 JVM_END
949
950 #ifndef PRODUCT
951 #define EACH_NAMED_CON(template, requirement) \
952 template(MethodHandles,GC_COUNT_GWT) \
953 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
954 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
955 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
956 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
957 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
958 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
959 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
960 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
961 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
962 template(MethodHandles,GC_LAMBDA_SUPPORT) \
963 /*end*/
964
965 #define IGNORE_REQ(req_expr) /* req_expr */
966 #define ONE_PLUS(scope,value) 1+
967 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
968 #define VALUE_COMMA(scope,value) scope::value,
969 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
970 #define STRING_NULL(scope,value) #value "\0"
971 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
972
973 static bool advertise_con_value(int which) {
974 if (which < 0) return false;
975 bool ok = true;
976 int count = 0;
977 #define INC_COUNT(scope,value) \
978 ++count;
979 #define CHECK_REQ(req_expr) \
980 if (which < count) return ok; \
981 ok = (req_expr);
982 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
983 #undef INC_COUNT
984 #undef CHECK_REQ
985 assert(count == con_value_count, "");
986 if (which < count) return ok;
987 return false;
988 }
989
990 #undef ONE_PLUS
991 #undef VALUE_COMMA
992 #undef STRING_NULL
993 #undef EACH_NAMED_CON
994 #endif // PRODUCT
995
996 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
997 #ifndef PRODUCT
998 if (advertise_con_value(which)) {
999 assert(which >= 0 && which < con_value_count, "");
1000 int con = con_values[which];
1001 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1002 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1003 const char* str = &con_names[0];
1004 for (int i = 0; i < which; i++)
1005 str += strlen(str) + 1; // skip name and null
1006 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1007 box->obj_at_put(0, name);
1008 }
1009 return con;
1010 }
1011 #endif
1012 return 0;
1013 }
1014 JVM_END
1015
1016 // void init(MemberName self, AccessibleObject ref)
1017 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1018 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1019 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1020 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1021 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1022 MethodHandles::init_MemberName(mname, target);
1023 }
1024 JVM_END
1025
1026 // void expand(MemberName self)
1027 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1028 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1029 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1030 MethodHandles::expand_MemberName(mname, 0, CHECK);
1031 }
1032 JVM_END
1033
1034 // void resolve(MemberName self, Class<?> caller)
1035 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1036 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1037 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1038
1039 // The trusted Java code that calls this method should already have performed
1040 // access checks on behalf of the given caller. But, we can verify this.
1041 if (VerifyMethodHandles && caller_jh != NULL &&
1042 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1043 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1044 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1045 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1046 }
1047
1048 // Reflection::verify_class_access can only handle instance classes.
1049 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1050 // Emulate LinkResolver::check_klass_accessability.
1051 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1052 if (!Reflection::verify_class_access(caller,
1053 reference_klass,
1054 true)) {
1055 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1056 }
1057 }
1058 }
1059
1060 KlassHandle caller(THREAD,
1061 caller_jh == NULL ? (Klass*) NULL :
1062 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1063 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1064
1065 if (resolved.is_null()) {
1066 int flags = java_lang_invoke_MemberName::flags(mname());
1067 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1068 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1069 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1070 }
1071 if ((flags & ALL_KINDS) == IS_FIELD) {
1072 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1073 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1074 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1075 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1076 } else {
1077 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1078 }
1079 }
1080
1081 return JNIHandles::make_local(THREAD, resolved());
1082 }
1083 JVM_END
1084
1085 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1086 if (mname == NULL ||
1087 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1088 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1089 } else {
1090 int flags = java_lang_invoke_MemberName::flags(mname);
1091 if ((flags & IS_FIELD) != 0 &&
1092 (must_be_static
1093 ? (flags & JVM_ACC_STATIC) != 0
1094 : (flags & JVM_ACC_STATIC) == 0)) {
1095 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1096 return (jlong) vmindex;
1097 }
1098 }
1099 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1100 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1101 return 0;
1102 }
1103
1104 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1105 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1106 }
1107 JVM_END
1108
1109 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1110 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1111 }
1112 JVM_END
1113
1114 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1115 // use the other function to perform sanity checks:
1116 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1117 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1118 return JNIHandles::make_local(THREAD, clazz);
1119 }
1120 JVM_END
1121
1122 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1123 if (mname_jh == NULL) return NULL;
1124 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1125 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1126 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1127 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1128 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1129 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1130 result->obj_at_put(0, x);
1131 x = NULL;
1132 if (vmtarget == NULL) {
1133 x = NULL;
1134 } else if (vmtarget->is_klass()) {
1135 x = ((Klass*) vmtarget)->java_mirror();
1136 } else if (vmtarget->is_method()) {
1137 x = mname();
1138 }
1139 result->obj_at_put(1, x);
1140 return JNIHandles::make_local(env, result());
1141 }
1142 JVM_END
1143
1144
1145
1146 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1147 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1148 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1149 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1150 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1151 if (clazz_jh == NULL || results_jh == NULL) return -1;
1152 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1153
1154 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1155 if (results.is_null() || !results->is_objArray()) return -1;
1156
1157 TempNewSymbol name = NULL;
1158 TempNewSymbol sig = NULL;
1159 if (name_jh != NULL) {
1160 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1161 if (name == NULL) return 0; // a match is not possible
1162 }
1163 if (sig_jh != NULL) {
1164 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1165 if (sig == NULL) return 0; // a match is not possible
1166 }
1167
1168 KlassHandle caller;
1169 if (caller_jh != NULL) {
1170 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1171 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1172 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1173 }
1174
1175 if (name != NULL && sig != NULL && results.not_null()) {
1176 // try a direct resolve
1177 // %%% TO DO
1178 }
1179
1180 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1181 caller, skip, results);
1182 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1183 return res;
1184 }
1185 JVM_END
1186
1187 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1188 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1189 Handle target (THREAD, JNIHandles::resolve(target_jh));
1190 {
1191 // Walk all nmethods depending on this call site.
1192 MutexLocker mu(Compile_lock, thread);
1193 Universe::flush_dependents_on(call_site, target);
1194 java_lang_invoke_CallSite::set_target(call_site(), target());
1195 }
1196 }
1197 JVM_END
1198
1199 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1200 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1201 Handle target (THREAD, JNIHandles::resolve(target_jh));
1202 {
1203 // Walk all nmethods depending on this call site.
1204 MutexLocker mu(Compile_lock, thread);
1205 Universe::flush_dependents_on(call_site, target);
1206 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1207 }
1208 }
1209 JVM_END
1210
1211 /**
1212 * Throws a java/lang/UnsupportedOperationException unconditionally.
1213 * This is required by the specification of MethodHandle.invoke if
1214 * invoked directly.
1215 */
1216 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1217 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1218 return NULL;
1219 }
1220 JVM_END
1221
1222 /**
1223 * Throws a java/lang/UnsupportedOperationException unconditionally.
1224 * This is required by the specification of MethodHandle.invokeExact if
1225 * invoked directly.
1226 */
1227 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1228 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1229 return NULL;
1230 }
1231 JVM_END
1232
1233 /// JVM_RegisterMethodHandleMethods
1234
1235 #undef CS // Solaris builds complain
1236
1237 #define LANG "Ljava/lang/"
1238 #define JLINV "Ljava/lang/invoke/"
1239
1240 #define OBJ LANG"Object;"
1241 #define CLS LANG"Class;"
1242 #define STRG LANG"String;"
1243 #define CS JLINV"CallSite;"
1244 #define MT JLINV"MethodType;"
1245 #define MH JLINV"MethodHandle;"
1246 #define MEM JLINV"MemberName;"
1247
1248 #define CC (char*) /*cast a literal from (const char*)*/
1249 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1250
1251 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1252 static JNINativeMethod MHN_methods[] = {
1253 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1254 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1255 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1256 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1257 // static native int getNamedCon(int which, Object[] name)
1258 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1259 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1260 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1261 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1262 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1263 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1264 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1265 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1266 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1267 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1268 };
1269
1270 static JNINativeMethod MH_methods[] = {
1271 // UnsupportedOperationException throwers
1272 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1273 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1274 };
1275
1276 /**
1277 * Helper method to register native methods.
1278 */
1279 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1280 int status = env->RegisterNatives(clazz, methods, nMethods);
1281 if (status != JNI_OK || env->ExceptionOccurred()) {
1282 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1283 env->ExceptionClear();
1284 return false;
1285 }
1286 return true;
1287 }
1288
1289 /**
1290 * This one function is exported, used by NativeLookup.
1291 */
1292 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1293 assert(!MethodHandles::enabled(), "must not be enabled");
1294 bool enable_MH = true;
1295
1296 jclass MH_class = NULL;
1297 if (SystemDictionary::MethodHandle_klass() == NULL) {
1298 enable_MH = false;
1299 } else {
1300 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1301 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1302 }
1303
1304 if (enable_MH) {
1305 ThreadToNativeFromVM ttnfv(thread);
1306
1307 if (enable_MH) {
1308 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1309 }
1310 if (enable_MH) {
1311 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1312 }
1313 }
1314
1315 if (TraceInvokeDynamic) {
1316 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1317 }
1318
1319 if (enable_MH) {
1320 MethodHandles::generate_adapters();
1321 MethodHandles::set_enabled(true);
1322 }
1323 }
1324 JVM_END