Mon, 25 Mar 2013 17:13:26 -0700
7198429: need checked categorization of caller-sensitive methods in the JDK
Reviewed-by: kvn, jrose
1 /*
2 * Copyright (c) 2008, 2012, 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 */
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 "runtime/compilationPolicy.hpp"
34 #include "runtime/javaCalls.hpp"
35 #include "runtime/reflection.hpp"
36 #include "runtime/signature.hpp"
37 #include "runtime/stubRoutines.hpp"
40 /*
41 * JSR 292 reference implementation: method handles
42 * The JDK 7 reference implementation represented method handle
43 * combinations as chains. Each link in the chain had a "vmentry"
44 * field which pointed at a bit of assembly code which performed
45 * one transformation before dispatching to the next link in the chain.
46 *
47 * The current reference implementation pushes almost all code generation
48 * responsibility to (trusted) Java code. A method handle contains a
49 * pointer to its "LambdaForm", which embodies all details of the method
50 * handle's behavior. The LambdaForm is a normal Java object, managed
51 * by a runtime coded in Java.
52 */
54 bool MethodHandles::_enabled = false; // set true after successful native linkage
55 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
57 //------------------------------------------------------------------------------
58 // MethodHandles::generate_adapters
59 //
60 void MethodHandles::generate_adapters() {
61 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
63 assert(_adapter_code == NULL, "generate only once");
65 ResourceMark rm;
66 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
67 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
68 if (_adapter_code == NULL)
69 vm_exit_out_of_memory(adapter_code_size, "CodeCache: no room for MethodHandles adapters");
70 {
71 CodeBuffer code(_adapter_code);
72 MethodHandlesAdapterGenerator g(&code);
73 g.generate();
74 code.log_section_sizes("MethodHandlesAdapterBlob");
75 }
76 }
78 //------------------------------------------------------------------------------
79 // MethodHandlesAdapterGenerator::generate
80 //
81 void MethodHandlesAdapterGenerator::generate() {
82 // Generate generic method handle adapters.
83 // Generate interpreter entries
84 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
85 mk <= Interpreter::method_handle_invoke_LAST;
86 mk = Interpreter::MethodKind(1 + (int)mk)) {
87 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
88 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
89 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
90 if (entry != NULL) {
91 Interpreter::set_entry_for_kind(mk, entry);
92 }
93 // If the entry is not set, it will throw AbstractMethodError.
94 }
95 }
97 void MethodHandles::set_enabled(bool z) {
98 if (_enabled != z) {
99 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
100 _enabled = z;
101 }
102 }
104 // MemberName support
106 // import java_lang_invoke_MemberName.*
107 enum {
108 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
109 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
110 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
111 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
112 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
113 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
114 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
115 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
116 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
117 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
118 };
120 Handle MethodHandles::new_MemberName(TRAPS) {
121 Handle empty;
122 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
123 if (!k->is_initialized()) k->initialize(CHECK_(empty));
124 return Handle(THREAD, k->allocate_instance(THREAD));
125 }
127 oop MethodHandles::init_MemberName(oop mname_oop, oop target_oop) {
128 Klass* target_klass = target_oop->klass();
129 if (target_klass == SystemDictionary::reflect_Field_klass()) {
130 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
131 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
132 int mods = java_lang_reflect_Field::modifiers(target_oop);
133 oop type = java_lang_reflect_Field::type(target_oop);
134 oop name = java_lang_reflect_Field::name(target_oop);
135 Klass* k = java_lang_Class::as_Klass(clazz);
136 intptr_t offset = InstanceKlass::cast(k)->field_offset(slot);
137 return init_field_MemberName(mname_oop, k, accessFlags_from(mods), type, name, offset);
138 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
139 oop clazz = java_lang_reflect_Method::clazz(target_oop);
140 int slot = java_lang_reflect_Method::slot(target_oop);
141 Klass* k = java_lang_Class::as_Klass(clazz);
142 if (k != NULL && k->oop_is_instance()) {
143 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
144 return init_method_MemberName(mname_oop, m, true, k);
145 }
146 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
147 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
148 int slot = java_lang_reflect_Constructor::slot(target_oop);
149 Klass* k = java_lang_Class::as_Klass(clazz);
150 if (k != NULL && k->oop_is_instance()) {
151 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
152 return init_method_MemberName(mname_oop, m, false, k);
153 }
154 } else if (target_klass == SystemDictionary::MemberName_klass()) {
155 // Note: This only works if the MemberName has already been resolved.
156 oop clazz = java_lang_invoke_MemberName::clazz(target_oop);
157 int flags = java_lang_invoke_MemberName::flags(target_oop);
158 Metadata* vmtarget=java_lang_invoke_MemberName::vmtarget(target_oop);
159 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(target_oop);
160 Klass* k = java_lang_Class::as_Klass(clazz);
161 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
162 if (vmtarget == NULL) return NULL; // not resolved
163 if ((flags & IS_FIELD) != 0) {
164 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
165 int basic_mods = (ref_kind_is_static(ref_kind) ? JVM_ACC_STATIC : 0);
166 // FIXME: how does k (receiver_limit) contribute?
167 return init_field_MemberName(mname_oop, (Klass*)vmtarget, accessFlags_from(basic_mods), NULL, NULL, vmindex);
168 } else if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
169 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
170 return init_method_MemberName(mname_oop, (Method*)vmtarget, ref_kind_does_dispatch(ref_kind), k);
171 } else {
172 return NULL;
173 }
174 }
175 return NULL;
176 }
178 oop MethodHandles::init_method_MemberName(oop mname_oop, Method* m, bool do_dispatch,
179 Klass* receiver_limit) {
180 AccessFlags mods = m->access_flags();
181 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
182 int vmindex = Method::nonvirtual_vtable_index; // implies never any dispatch
183 Klass* mklass = m->method_holder();
184 if (receiver_limit == NULL)
185 receiver_limit = mklass;
186 if (m->is_initializer()) {
187 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
188 } else if (mods.is_static()) {
189 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
190 } else if (receiver_limit != mklass &&
191 !receiver_limit->is_subtype_of(mklass)) {
192 return NULL; // bad receiver limit
193 } else if (receiver_limit->is_interface() &&
194 mklass->is_interface()) {
195 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
196 receiver_limit = mklass; // ignore passed-in limit; interfaces are interconvertible
197 vmindex = klassItable::compute_itable_index(m);
198 } else if (mklass != receiver_limit && mklass->is_interface()) {
199 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
200 // it is a miranda method, so m->vtable_index is not what we want
201 ResourceMark rm;
202 klassVtable* vt = InstanceKlass::cast(receiver_limit)->vtable();
203 vmindex = vt->index_of_miranda(m->name(), m->signature());
204 } else if (!do_dispatch || m->can_be_statically_bound()) {
205 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
206 } else {
207 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
208 vmindex = m->vtable_index();
209 }
211 // @CallerSensitive annotation detected
212 if (m->caller_sensitive()) {
213 flags |= CALLER_SENSITIVE;
214 }
216 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
217 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m);
218 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
219 java_lang_invoke_MemberName::set_clazz( mname_oop, receiver_limit->java_mirror());
220 // Note: name and type can be lazily computed by resolve_MemberName,
221 // if Java code needs them as resolved String and MethodType objects.
222 // The clazz must be eagerly stored, because it provides a GC
223 // root to help keep alive the Method*.
224 // If relevant, the vtable or itable value is stored as vmindex.
225 // This is done eagerly, since it is readily available without
226 // constructing any new objects.
227 // TO DO: maybe intern mname_oop
228 return mname_oop;
229 }
231 Handle MethodHandles::init_method_MemberName(oop mname_oop, CallInfo& info, TRAPS) {
232 Handle empty;
233 if (info.resolved_appendix().not_null()) {
234 // The resolved MemberName must not be accompanied by an appendix argument,
235 // since there is no way to bind this value into the MemberName.
236 // Caller is responsible to prevent this from happening.
237 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
238 }
239 methodHandle m = info.resolved_method();
240 KlassHandle defc = info.resolved_klass();
241 int vmindex = -1;
242 if (defc->is_interface() && m->method_holder()->is_interface()) {
243 // LinkResolver does not report itable indexes! (fix this?)
244 vmindex = klassItable::compute_itable_index(m());
245 } else if (m->can_be_statically_bound()) {
246 // LinkResolver reports vtable index even for final methods!
247 vmindex = Method::nonvirtual_vtable_index;
248 } else {
249 vmindex = info.vtable_index();
250 }
251 oop res = init_method_MemberName(mname_oop, m(), (vmindex >= 0), defc());
252 assert(res == NULL || (java_lang_invoke_MemberName::vmindex(res) == vmindex), "");
253 return Handle(THREAD, res);
254 }
256 oop MethodHandles::init_field_MemberName(oop mname_oop, Klass* field_holder,
257 AccessFlags mods, oop type, oop name,
258 intptr_t offset, bool is_setter) {
259 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
260 flags |= IS_FIELD | ((mods.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
261 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
262 Metadata* vmtarget = field_holder;
263 int vmindex = offset; // determines the field uniquely when combined with static bit
264 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
265 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
266 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
267 java_lang_invoke_MemberName::set_clazz(mname_oop, field_holder->java_mirror());
268 if (name != NULL)
269 java_lang_invoke_MemberName::set_name(mname_oop, name);
270 if (type != NULL)
271 java_lang_invoke_MemberName::set_type(mname_oop, type);
272 // Note: name and type can be lazily computed by resolve_MemberName,
273 // if Java code needs them as resolved String and Class objects.
274 // Note that the incoming type oop might be pre-resolved (non-null).
275 // The base clazz and field offset (vmindex) must be eagerly stored,
276 // because they unambiguously identify the field.
277 // Although the fieldDescriptor::_index would also identify the field,
278 // we do not use it, because it is harder to decode.
279 // TO DO: maybe intern mname_oop
280 return mname_oop;
281 }
283 Handle MethodHandles::init_field_MemberName(oop mname_oop, FieldAccessInfo& info, TRAPS) {
284 return Handle();
285 #if 0 // FIXME
286 KlassHandle field_holder = info.klass();
287 intptr_t field_offset = info.field_offset();
288 return init_field_MemberName(mname_oop, field_holder(),
289 info.access_flags(),
290 type, name,
291 field_offset, false /*is_setter*/);
292 #endif
293 }
296 // JVM 2.9 Special Methods:
297 // A method is signature polymorphic if and only if all of the following conditions hold :
298 // * It is declared in the java.lang.invoke.MethodHandle class.
299 // * It has a single formal parameter of type Object[].
300 // * It has a return type of Object.
301 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
302 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
303 if (klass == NULL)
304 return false;
305 // The following test will fail spuriously during bootstrap of MethodHandle itself:
306 // if (klass != SystemDictionary::MethodHandle_klass())
307 // Test the name instead:
308 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
309 return false;
310 Symbol* poly_sig = vmSymbols::object_array_object_signature();
311 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
312 if (m == NULL) return false;
313 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
314 int flags = m->access_flags().as_int();
315 return (flags & required) == required;
316 }
319 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
320 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
321 switch (iid) {
322 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
323 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
324 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
325 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
326 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
327 }
328 assert(false, "");
329 return 0;
330 }
332 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
333 switch (iid) {
334 case vmIntrinsics::_invokeBasic: return 0;
335 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
336 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
337 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
338 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
339 }
340 assert(false, err_msg("iid=%d", iid));
341 return 0;
342 }
344 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
345 vmSymbols::SID name_id = vmSymbols::find_sid(name);
346 switch (name_id) {
347 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
348 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
349 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
350 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
352 // There is one static signature-polymorphic method for each JVM invocation mode.
353 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
354 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
355 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
356 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
357 }
359 // Cover the case of invokeExact and any future variants of invokeFoo.
360 Klass* mh_klass = SystemDictionary::well_known_klass(
361 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
362 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
363 return vmIntrinsics::_invokeGeneric;
365 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
366 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
367 return vmIntrinsics::_none;
368 }
370 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
371 if (klass != NULL &&
372 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
373 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
374 if (iid != vmIntrinsics::_none)
375 return iid;
376 if (is_method_handle_invoke_name(klass, name))
377 return vmIntrinsics::_invokeGeneric;
378 }
379 return vmIntrinsics::_none;
380 }
383 // convert the external string or reflective type to an internal signature
384 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
385 if (java_lang_invoke_MethodType::is_instance(type_str)) {
386 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
387 } else if (java_lang_Class::is_instance(type_str)) {
388 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
389 } else if (java_lang_String::is_instance(type_str)) {
390 if (intern_if_not_found) {
391 return java_lang_String::as_symbol(type_str, CHECK_NULL);
392 } else {
393 return java_lang_String::as_symbol_or_null(type_str);
394 }
395 } else {
396 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
397 }
398 }
400 static const char OBJ_SIG[] = "Ljava/lang/Object;";
401 enum { OBJ_SIG_LEN = 18 };
403 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
404 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
405 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
406 const int len = sig->utf8_length();
407 for (int i = 0; i < len; i++) {
408 switch (sig->byte_at(i)) {
409 case 'L':
410 // only java/lang/Object is valid here
411 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
412 return false;
413 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
414 continue;
415 case '(': case ')': case 'V':
416 case 'I': case 'J': case 'F': case 'D':
417 continue;
418 //case '[':
419 //case 'Z': case 'B': case 'C': case 'S':
420 default:
421 return false;
422 }
423 }
424 return true;
425 }
427 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
428 Symbol* bsig = NULL;
429 if (sig == NULL) {
430 return sig;
431 } else if (is_basic_type_signature(sig)) {
432 sig->increment_refcount();
433 return sig; // that was easy
434 } else if (sig->byte_at(0) != '(') {
435 BasicType bt = char2type(sig->byte_at(0));
436 if (is_subword_type(bt)) {
437 bsig = vmSymbols::int_signature();
438 } else {
439 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
440 bsig = vmSymbols::object_signature();
441 }
442 } else {
443 ResourceMark rm;
444 stringStream buffer(128);
445 buffer.put('(');
446 int arg_pos = 0, keep_arg_pos = -1;
447 if (keep_last_arg)
448 keep_arg_pos = ArgumentCount(sig).size() - 1;
449 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
450 BasicType bt = ss.type();
451 size_t this_arg_pos = buffer.size();
452 if (ss.at_return_type()) {
453 buffer.put(')');
454 }
455 if (arg_pos == keep_arg_pos) {
456 buffer.write((char*) ss.raw_bytes(),
457 (int) ss.raw_length());
458 } else if (bt == T_OBJECT || bt == T_ARRAY) {
459 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
460 } else {
461 if (is_subword_type(bt))
462 bt = T_INT;
463 buffer.put(type2char(bt));
464 }
465 arg_pos++;
466 }
467 const char* sigstr = buffer.base();
468 int siglen = (int) buffer.size();
469 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
470 }
471 assert(is_basic_type_signature(bsig) ||
472 // detune assert in case the injected argument is not a basic type:
473 keep_last_arg, "");
474 return bsig;
475 }
477 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
478 Symbol* sig,
479 bool keep_arrays,
480 bool keep_basic_names) {
481 st = st ? st : tty;
482 int len = sig->utf8_length();
483 int array = 0;
484 bool prev_type = false;
485 for (int i = 0; i < len; i++) {
486 char ch = sig->byte_at(i);
487 switch (ch) {
488 case '(': case ')':
489 prev_type = false;
490 st->put(ch);
491 continue;
492 case '[':
493 if (!keep_basic_names && keep_arrays)
494 st->put(ch);
495 array++;
496 continue;
497 case 'L':
498 {
499 if (prev_type) st->put(',');
500 int start = i+1, slash = start;
501 while (++i < len && (ch = sig->byte_at(i)) != ';') {
502 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
503 }
504 if (slash < i) start = slash;
505 if (!keep_basic_names) {
506 st->put('L');
507 } else {
508 for (int j = start; j < i; j++)
509 st->put(sig->byte_at(j));
510 prev_type = true;
511 }
512 break;
513 }
514 default:
515 {
516 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
517 ch = '[';
518 array = 0;
519 }
520 if (prev_type) st->put(',');
521 const char* n = NULL;
522 if (keep_basic_names)
523 n = type2name(char2type(ch));
524 if (n == NULL) {
525 // unknown letter, or we don't want to know its name
526 st->put(ch);
527 } else {
528 st->print(n);
529 prev_type = true;
530 }
531 break;
532 }
533 }
534 // Switch break goes here to take care of array suffix:
535 if (prev_type) {
536 while (array > 0) {
537 st->print("[]");
538 --array;
539 }
540 }
541 array = 0;
542 }
543 }
547 static oop object_java_mirror() {
548 return SystemDictionary::Object_klass()->java_mirror();
549 }
551 static oop field_name_or_null(Symbol* s) {
552 if (s == NULL) return NULL;
553 return StringTable::lookup(s);
554 }
556 static oop field_signature_type_or_null(Symbol* s) {
557 if (s == NULL) return NULL;
558 BasicType bt = FieldType::basic_type(s);
559 if (is_java_primitive(bt)) {
560 assert(s->utf8_length() == 1, "");
561 return java_lang_Class::primitive_mirror(bt);
562 }
563 // Here are some more short cuts for common types.
564 // They are optional, since reference types can be resolved lazily.
565 if (bt == T_OBJECT) {
566 if (s == vmSymbols::object_signature()) {
567 return object_java_mirror();
568 } else if (s == vmSymbols::class_signature()) {
569 return SystemDictionary::Class_klass()->java_mirror();
570 } else if (s == vmSymbols::string_signature()) {
571 return SystemDictionary::String_klass()->java_mirror();
572 }
573 }
574 return NULL;
575 }
578 // An unresolved member name is a mere symbolic reference.
579 // Resolving it plants a vmtarget/vmindex in it,
580 // which refers directly to JVM internals.
581 Handle MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
582 Handle empty;
583 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
585 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
586 // Already resolved.
587 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
588 assert(vmindex >= Method::nonvirtual_vtable_index, "");
589 return mname;
590 }
592 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
593 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
594 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
595 int flags = java_lang_invoke_MemberName::flags(mname());
596 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
597 if (!ref_kind_is_valid(ref_kind)) {
598 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
599 }
601 DEBUG_ONLY(int old_vmindex);
602 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
604 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
605 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
606 }
608 instanceKlassHandle defc;
609 {
610 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
611 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
612 if (!defc_klass->oop_is_instance()) {
613 if (!defc_klass->oop_is_array()) return empty;
614 defc_klass = SystemDictionary::Object_klass();
615 }
616 defc = instanceKlassHandle(THREAD, defc_klass);
617 }
618 if (defc.is_null()) {
619 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
620 }
621 defc->link_class(CHECK_(empty)); // possible safepoint
623 // convert the external string name to an internal symbol
624 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
625 if (name == NULL) return empty; // no such name
626 if (name == vmSymbols::class_initializer_name())
627 return empty; // illegal name
629 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
630 if ((flags & ALL_KINDS) == IS_METHOD &&
631 (defc() == SystemDictionary::MethodHandle_klass()) &&
632 (ref_kind == JVM_REF_invokeVirtual ||
633 ref_kind == JVM_REF_invokeSpecial ||
634 // static invocation mode is required for _linkToVirtual, etc.:
635 ref_kind == JVM_REF_invokeStatic)) {
636 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
637 if (iid != vmIntrinsics::_none &&
638 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
639 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
640 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
641 mh_invoke_id = iid;
642 }
643 }
645 // convert the external string or reflective type to an internal signature
646 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
647 if (type == NULL) return empty; // no such signature exists in the VM
649 // Time to do the lookup.
650 switch (flags & ALL_KINDS) {
651 case IS_METHOD:
652 {
653 CallInfo result;
654 bool do_dispatch = true; // default, neutral setting
655 {
656 assert(!HAS_PENDING_EXCEPTION, "");
657 if (ref_kind == JVM_REF_invokeStatic) {
658 //do_dispatch = false; // no need, since statics are never dispatched
659 LinkResolver::resolve_static_call(result,
660 defc, name, type, KlassHandle(), false, false, THREAD);
661 } else if (ref_kind == JVM_REF_invokeInterface) {
662 LinkResolver::resolve_interface_call(result, Handle(), defc,
663 defc, name, type, KlassHandle(), false, false, THREAD);
664 } else if (mh_invoke_id != vmIntrinsics::_none) {
665 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
666 LinkResolver::resolve_handle_call(result,
667 defc, name, type, KlassHandle(), THREAD);
668 } else if (ref_kind == JVM_REF_invokeSpecial) {
669 do_dispatch = false; // force non-virtual linkage
670 LinkResolver::resolve_special_call(result,
671 defc, name, type, KlassHandle(), false, THREAD);
672 } else if (ref_kind == JVM_REF_invokeVirtual) {
673 LinkResolver::resolve_virtual_call(result, Handle(), defc,
674 defc, name, type, KlassHandle(), false, false, THREAD);
675 } else {
676 assert(false, err_msg("ref_kind=%d", ref_kind));
677 }
678 if (HAS_PENDING_EXCEPTION) {
679 return empty;
680 }
681 }
682 return init_method_MemberName(mname(), result, THREAD);
683 }
684 case IS_CONSTRUCTOR:
685 {
686 CallInfo result;
687 {
688 assert(!HAS_PENDING_EXCEPTION, "");
689 if (name == vmSymbols::object_initializer_name()) {
690 LinkResolver::resolve_special_call(result,
691 defc, name, type, KlassHandle(), false, THREAD);
692 } else {
693 break; // will throw after end of switch
694 }
695 if (HAS_PENDING_EXCEPTION) {
696 return empty;
697 }
698 }
699 assert(result.is_statically_bound(), "");
700 return init_method_MemberName(mname(), result, THREAD);
701 }
702 case IS_FIELD:
703 {
704 // This is taken from LinkResolver::resolve_field, sans access checks.
705 fieldDescriptor fd; // find_field initializes fd if found
706 KlassHandle sel_klass(THREAD, InstanceKlass::cast(defc())->find_field(name, type, &fd));
707 // check if field exists; i.e., if a klass containing the field def has been selected
708 if (sel_klass.is_null()) return empty; // should not happen
709 oop type = field_signature_type_or_null(fd.signature());
710 oop name = field_name_or_null(fd.name());
711 bool is_setter = (ref_kind_is_valid(ref_kind) && ref_kind_is_setter(ref_kind));
712 mname = Handle(THREAD,
713 init_field_MemberName(mname(), sel_klass(),
714 fd.access_flags(), type, name, fd.offset(), is_setter));
715 return mname;
716 }
717 default:
718 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
719 }
721 return empty;
722 }
724 // Conversely, a member name which is only initialized from JVM internals
725 // may have null defc, name, and type fields.
726 // Resolving it plants a vmtarget/vmindex in it,
727 // which refers directly to JVM internals.
728 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
729 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
730 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
731 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
732 if (vmtarget == NULL) {
733 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
734 }
736 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
737 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
738 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
739 int flags = java_lang_invoke_MemberName::flags(mname());
741 if (suppress != 0) {
742 if (suppress & _suppress_defc) have_defc = true;
743 if (suppress & _suppress_name) have_name = true;
744 if (suppress & _suppress_type) have_type = true;
745 }
747 if (have_defc && have_name && have_type) return; // nothing needed
749 switch (flags & ALL_KINDS) {
750 case IS_METHOD:
751 case IS_CONSTRUCTOR:
752 {
753 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
754 methodHandle m(THREAD, (Method*)vmtarget);
755 DEBUG_ONLY(vmtarget = NULL); // safety
756 if (m.is_null()) break;
757 if (!have_defc) {
758 InstanceKlass* defc = m->method_holder();
759 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
760 }
761 if (!have_name) {
762 //not java_lang_String::create_from_symbol; let's intern member names
763 Handle name = StringTable::intern(m->name(), CHECK);
764 java_lang_invoke_MemberName::set_name(mname(), name());
765 }
766 if (!have_type) {
767 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
768 java_lang_invoke_MemberName::set_type(mname(), type());
769 }
770 return;
771 }
772 case IS_FIELD:
773 {
774 // This is taken from LinkResolver::resolve_field, sans access checks.
775 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
776 if (!((Klass*) vmtarget)->oop_is_instance()) break;
777 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
778 DEBUG_ONLY(vmtarget = NULL); // safety
779 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
780 fieldDescriptor fd; // find_field initializes fd if found
781 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
782 break; // cannot expand
783 if (!have_defc) {
784 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
785 }
786 if (!have_name) {
787 //not java_lang_String::create_from_symbol; let's intern member names
788 Handle name = StringTable::intern(fd.name(), CHECK);
789 java_lang_invoke_MemberName::set_name(mname(), name());
790 }
791 if (!have_type) {
792 // If it is a primitive field type, don't mess with short strings like "I".
793 Handle type = field_signature_type_or_null(fd.signature());
794 if (type.is_null()) {
795 java_lang_String::create_from_symbol(fd.signature(), CHECK);
796 }
797 java_lang_invoke_MemberName::set_type(mname(), type());
798 }
799 return;
800 }
801 }
802 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
803 }
805 int MethodHandles::find_MemberNames(Klass* k,
806 Symbol* name, Symbol* sig,
807 int mflags, Klass* caller,
808 int skip, objArrayOop results) {
809 DEBUG_ONLY(No_Safepoint_Verifier nsv);
810 // this code contains no safepoints!
812 // %%% take caller into account!
814 if (k == NULL || !k->oop_is_instance()) return -1;
816 int rfill = 0, rlimit = results->length(), rskip = skip;
817 // overflow measurement:
818 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
820 int match_flags = mflags;
821 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
822 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
823 bool local_only = !(search_superc | search_intfc);
824 bool classes_only = false;
826 if (name != NULL) {
827 if (name->utf8_length() == 0) return 0; // a match is not possible
828 }
829 if (sig != NULL) {
830 if (sig->utf8_length() == 0) return 0; // a match is not possible
831 if (sig->byte_at(0) == '(')
832 match_flags &= ~(IS_FIELD | IS_TYPE);
833 else
834 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
835 }
837 if ((match_flags & IS_TYPE) != 0) {
838 // NYI, and Core Reflection works quite well for this query
839 }
841 if ((match_flags & IS_FIELD) != 0) {
842 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
843 if (name != NULL && st.name() != name)
844 continue;
845 if (sig != NULL && st.signature() != sig)
846 continue;
847 // passed the filters
848 if (rskip > 0) {
849 --rskip;
850 } else if (rfill < rlimit) {
851 oop result = results->obj_at(rfill++);
852 if (!java_lang_invoke_MemberName::is_instance(result))
853 return -99; // caller bug!
854 oop type = field_signature_type_or_null(st.signature());
855 oop name = field_name_or_null(st.name());
856 oop saved = MethodHandles::init_field_MemberName(result, st.klass()(),
857 st.access_flags(), type, name,
858 st.offset());
859 if (saved != result)
860 results->obj_at_put(rfill-1, saved); // show saved instance to user
861 } else if (++overflow >= overflow_limit) {
862 match_flags = 0; break; // got tired of looking at overflow
863 }
864 }
865 }
867 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
868 // watch out for these guys:
869 Symbol* init_name = vmSymbols::object_initializer_name();
870 Symbol* clinit_name = vmSymbols::class_initializer_name();
871 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
872 bool negate_name_test = false;
873 // fix name so that it captures the intention of IS_CONSTRUCTOR
874 if (!(match_flags & IS_METHOD)) {
875 // constructors only
876 if (name == NULL) {
877 name = init_name;
878 } else if (name != init_name) {
879 return 0; // no constructors of this method name
880 }
881 } else if (!(match_flags & IS_CONSTRUCTOR)) {
882 // methods only
883 if (name == NULL) {
884 name = init_name;
885 negate_name_test = true; // if we see the name, we *omit* the entry
886 } else if (name == init_name) {
887 return 0; // no methods of this constructor name
888 }
889 } else {
890 // caller will accept either sort; no need to adjust name
891 }
892 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
893 Method* m = st.method();
894 Symbol* m_name = m->name();
895 if (m_name == clinit_name)
896 continue;
897 if (name != NULL && ((m_name != name) ^ negate_name_test))
898 continue;
899 if (sig != NULL && m->signature() != sig)
900 continue;
901 // passed the filters
902 if (rskip > 0) {
903 --rskip;
904 } else if (rfill < rlimit) {
905 oop result = results->obj_at(rfill++);
906 if (!java_lang_invoke_MemberName::is_instance(result))
907 return -99; // caller bug!
908 oop saved = MethodHandles::init_method_MemberName(result, m, true, NULL);
909 if (saved != result)
910 results->obj_at_put(rfill-1, saved); // show saved instance to user
911 } else if (++overflow >= overflow_limit) {
912 match_flags = 0; break; // got tired of looking at overflow
913 }
914 }
915 }
917 // return number of elements we at leasted wanted to initialize
918 return rfill + overflow;
919 }
920 //
921 // Here are the native methods in java.lang.invoke.MethodHandleNatives
922 // They are the private interface between this JVM and the HotSpot-specific
923 // Java code that implements JSR 292 method handles.
924 //
925 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
926 // that intrinsic (non-JNI) native methods are defined in HotSpot.
927 //
929 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
930 switch (which) {
931 case MethodHandles::GC_COUNT_GWT:
932 #ifdef COMPILER2
933 return true;
934 #else
935 return false;
936 #endif
937 }
938 return 0;
939 }
940 JVM_END
942 #ifndef PRODUCT
943 #define EACH_NAMED_CON(template, requirement) \
944 template(MethodHandles,GC_COUNT_GWT) \
945 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
946 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
947 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
948 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
949 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
950 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
951 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
952 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
953 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
954 template(MethodHandles,GC_LAMBDA_SUPPORT) \
955 /*end*/
957 #define IGNORE_REQ(req_expr) /* req_expr */
958 #define ONE_PLUS(scope,value) 1+
959 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
960 #define VALUE_COMMA(scope,value) scope::value,
961 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
962 #define STRING_NULL(scope,value) #value "\0"
963 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
965 static bool advertise_con_value(int which) {
966 if (which < 0) return false;
967 bool ok = true;
968 int count = 0;
969 #define INC_COUNT(scope,value) \
970 ++count;
971 #define CHECK_REQ(req_expr) \
972 if (which < count) return ok; \
973 ok = (req_expr);
974 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
975 #undef INC_COUNT
976 #undef CHECK_REQ
977 assert(count == con_value_count, "");
978 if (which < count) return ok;
979 return false;
980 }
982 #undef ONE_PLUS
983 #undef VALUE_COMMA
984 #undef STRING_NULL
985 #undef EACH_NAMED_CON
986 #endif // PRODUCT
988 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
989 #ifndef PRODUCT
990 if (advertise_con_value(which)) {
991 assert(which >= 0 && which < con_value_count, "");
992 int con = con_values[which];
993 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
994 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
995 const char* str = &con_names[0];
996 for (int i = 0; i < which; i++)
997 str += strlen(str) + 1; // skip name and null
998 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
999 box->obj_at_put(0, name);
1000 }
1001 return con;
1002 }
1003 #endif
1004 return 0;
1005 }
1006 JVM_END
1008 // void init(MemberName self, AccessibleObject ref)
1009 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1010 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1011 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1012 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1013 oop target_oop = JNIHandles::resolve_non_null(target_jh);
1014 MethodHandles::init_MemberName(mname(), target_oop);
1015 }
1016 JVM_END
1018 // void expand(MemberName self)
1019 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1020 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1021 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1022 MethodHandles::expand_MemberName(mname, 0, CHECK);
1023 }
1024 JVM_END
1026 // void resolve(MemberName self, Class<?> caller)
1027 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1028 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1029 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1031 // The trusted Java code that calls this method should already have performed
1032 // access checks on behalf of the given caller. But, we can verify this.
1033 if (VerifyMethodHandles && caller_jh != NULL &&
1034 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1035 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1036 if (reference_klass != NULL) {
1037 // Emulate LinkResolver::check_klass_accessability.
1038 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1039 if (!Reflection::verify_class_access(caller,
1040 reference_klass,
1041 true)) {
1042 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1043 }
1044 }
1045 }
1047 Handle resolved = MethodHandles::resolve_MemberName(mname, CHECK_NULL);
1048 if (resolved.is_null()) {
1049 int flags = java_lang_invoke_MemberName::flags(mname());
1050 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1051 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1052 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1053 }
1054 if ((flags & ALL_KINDS) == IS_FIELD) {
1055 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1056 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1057 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1058 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1059 } else {
1060 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1061 }
1062 }
1064 return JNIHandles::make_local(THREAD, resolved());
1065 }
1066 JVM_END
1068 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1069 if (mname == NULL ||
1070 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1071 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1072 } else {
1073 int flags = java_lang_invoke_MemberName::flags(mname);
1074 if ((flags & IS_FIELD) != 0 &&
1075 (must_be_static
1076 ? (flags & JVM_ACC_STATIC) != 0
1077 : (flags & JVM_ACC_STATIC) == 0)) {
1078 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1079 return (jlong) vmindex;
1080 }
1081 }
1082 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1083 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1084 return 0;
1085 }
1087 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1088 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1089 }
1090 JVM_END
1092 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1093 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1094 }
1095 JVM_END
1097 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1098 // use the other function to perform sanity checks:
1099 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1100 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1101 return JNIHandles::make_local(THREAD, clazz);
1102 }
1103 JVM_END
1105 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1106 if (mname_jh == NULL) return NULL;
1107 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1108 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1109 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1110 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1111 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1112 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1113 result->obj_at_put(0, x);
1114 x = NULL;
1115 if (vmtarget == NULL) {
1116 x = NULL;
1117 } else if (vmtarget->is_klass()) {
1118 x = ((Klass*) vmtarget)->java_mirror();
1119 } else if (vmtarget->is_method()) {
1120 Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL);
1121 x = MethodHandles::init_method_MemberName(mname2(), (Method*)vmtarget, false, NULL);
1122 }
1123 result->obj_at_put(1, x);
1124 return JNIHandles::make_local(env, result());
1125 }
1126 JVM_END
1130 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1131 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1132 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1133 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1134 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1135 if (clazz_jh == NULL || results_jh == NULL) return -1;
1136 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1138 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1139 if (results.is_null() || !results->is_objArray()) return -1;
1141 TempNewSymbol name = NULL;
1142 TempNewSymbol sig = NULL;
1143 if (name_jh != NULL) {
1144 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1145 if (name == NULL) return 0; // a match is not possible
1146 }
1147 if (sig_jh != NULL) {
1148 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1149 if (sig == NULL) return 0; // a match is not possible
1150 }
1152 KlassHandle caller;
1153 if (caller_jh != NULL) {
1154 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1155 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1156 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1157 }
1159 if (name != NULL && sig != NULL && results.not_null()) {
1160 // try a direct resolve
1161 // %%% TO DO
1162 }
1164 int res = MethodHandles::find_MemberNames(k(), name, sig, mflags,
1165 caller(), skip, results());
1166 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1167 return res;
1168 }
1169 JVM_END
1171 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1172 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1173 Handle target (THREAD, JNIHandles::resolve(target_jh));
1174 {
1175 // Walk all nmethods depending on this call site.
1176 MutexLocker mu(Compile_lock, thread);
1177 Universe::flush_dependents_on(call_site, target);
1178 java_lang_invoke_CallSite::set_target(call_site(), target());
1179 }
1180 }
1181 JVM_END
1183 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1184 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1185 Handle target (THREAD, JNIHandles::resolve(target_jh));
1186 {
1187 // Walk all nmethods depending on this call site.
1188 MutexLocker mu(Compile_lock, thread);
1189 Universe::flush_dependents_on(call_site, target);
1190 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1191 }
1192 }
1193 JVM_END
1195 /// JVM_RegisterMethodHandleMethods
1197 #undef CS // Solaris builds complain
1199 #define LANG "Ljava/lang/"
1200 #define JLINV "Ljava/lang/invoke/"
1202 #define OBJ LANG"Object;"
1203 #define CLS LANG"Class;"
1204 #define STRG LANG"String;"
1205 #define CS JLINV"CallSite;"
1206 #define MT JLINV"MethodType;"
1207 #define MH JLINV"MethodHandle;"
1208 #define MEM JLINV"MemberName;"
1210 #define CC (char*) /*cast a literal from (const char*)*/
1211 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1213 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1214 static JNINativeMethod required_methods_JDK8[] = {
1215 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1216 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1217 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1218 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1219 // static native int getNamedCon(int which, Object[] name)
1220 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1221 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1222 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1223 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1224 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1225 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1226 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1227 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1228 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1229 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1230 };
1232 // This one function is exported, used by NativeLookup.
1234 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1235 if (!EnableInvokeDynamic) {
1236 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
1237 return; // bind nothing
1238 }
1240 assert(!MethodHandles::enabled(), "must not be enabled");
1241 bool enable_MH = true;
1243 jclass MH_class = NULL;
1244 if (SystemDictionary::MethodHandle_klass() == NULL) {
1245 enable_MH = false;
1246 } else {
1247 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1248 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1249 }
1251 int status;
1253 if (enable_MH) {
1254 ThreadToNativeFromVM ttnfv(thread);
1256 status = env->RegisterNatives(MHN_class, required_methods_JDK8, sizeof(required_methods_JDK8)/sizeof(JNINativeMethod));
1257 if (status != JNI_OK || env->ExceptionOccurred()) {
1258 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1259 enable_MH = false;
1260 env->ExceptionClear();
1261 }
1262 }
1264 if (TraceInvokeDynamic) {
1265 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1266 }
1268 if (enable_MH) {
1269 MethodHandles::generate_adapters();
1270 MethodHandles::set_enabled(true);
1271 }
1272 }
1273 JVM_END