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/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 "oops/methodOop.hpp"
33 #include "prims/jvmtiRedefineClassesTrace.hpp"
34 #include "prims/methodHandles.hpp"
35 #include "runtime/compilationPolicy.hpp"
36 #include "runtime/javaCalls.hpp"
37 #include "runtime/reflection.hpp"
38 #include "runtime/signature.hpp"
39 #include "runtime/stubRoutines.hpp"
40
41
42 /*
43 * JSR 292 reference implementation: method handles
44 * The JDK 7 reference implementation represented method handle
45 * combinations as chains. Each link in the chain had a "vmentry"
46 * field which pointed at a bit of assembly code which performed
47 * one transformation before dispatching to the next link in the chain.
48 *
49 * The current reference implementation pushes almost all code generation
50 * responsibility to (trusted) Java code. A method handle contains a
51 * pointer to its "LambdaForm", which embodies all details of the method
52 * handle's behavior. The LambdaForm is a normal Java object, managed
53 * by a runtime coded in Java.
54 */
55
56 bool MethodHandles::_enabled = false; // set true after successful native linkage
57 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
58
59 //------------------------------------------------------------------------------
60 // MethodHandles::generate_adapters
61 //
62 void MethodHandles::generate_adapters() {
63 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
64
65 assert(_adapter_code == NULL, "generate only once");
66
67 ResourceMark rm;
68 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
69 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
70 if (_adapter_code == NULL)
71 vm_exit_out_of_memory(adapter_code_size, "CodeCache: no room for MethodHandles adapters");
72 {
73 CodeBuffer code(_adapter_code);
74 MethodHandlesAdapterGenerator g(&code);
75 g.generate();
76 code.log_section_sizes("MethodHandlesAdapterBlob");
77 }
78 }
79
80 //------------------------------------------------------------------------------
81 // MethodHandlesAdapterGenerator::generate
82 //
83 void MethodHandlesAdapterGenerator::generate() {
84 // Generate generic method handle adapters.
85 // Generate interpreter entries
86 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
87 mk <= Interpreter::method_handle_invoke_LAST;
88 mk = Interpreter::MethodKind(1 + (int)mk)) {
89 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
90 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
91 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
92 if (entry != NULL) {
93 Interpreter::set_entry_for_kind(mk, entry);
94 }
95 // If the entry is not set, it will throw AbstractMethodError.
96 }
97 }
98
99 void MethodHandles::set_enabled(bool z) {
100 if (_enabled != z) {
101 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
102 _enabled = z;
103 }
104 }
105
106 // MemberName support
107
108 // import java_lang_invoke_MemberName.*
109 enum {
110 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
111 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
112 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
113 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
114 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
115 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
116 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
117 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
118 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
119 };
120
121 Handle MethodHandles::new_MemberName(TRAPS) {
122 Handle empty;
123 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
124 if (!k->is_initialized()) k->initialize(CHECK_(empty));
125 return Handle(THREAD, k->allocate_instance(THREAD));
126 }
127
128 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
129 Thread* thread = Thread::current();
130 oop target_oop = target();
131 klassOop target_klass = target_oop->klass();
132 if (target_klass == SystemDictionary::reflect_Field_klass()) {
133 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
134 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
135 int mods = java_lang_reflect_Field::modifiers(target_oop);
136 oop type = java_lang_reflect_Field::type(target_oop);
137 oop name = java_lang_reflect_Field::name(target_oop);
138 KlassHandle k(thread, java_lang_Class::as_klassOop(clazz));
139 intptr_t offset = instanceKlass::cast(k())->field_offset(slot);
140 return init_field_MemberName(mname, k, accessFlags_from(mods), type, name, offset);
141 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
142 oop clazz = java_lang_reflect_Method::clazz(target_oop);
143 int slot = java_lang_reflect_Method::slot(target_oop);
144 KlassHandle k(thread, java_lang_Class::as_klassOop(clazz));
145 if (!k.is_null() && k->oop_is_instance()) {
146 methodOop m = instanceKlass::cast(k())->method_with_idnum(slot);
147 return init_method_MemberName(mname, m, true, k);
148 }
149 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
150 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
151 int slot = java_lang_reflect_Constructor::slot(target_oop);
152 KlassHandle k(thread, java_lang_Class::as_klassOop(clazz));
153 if (!k.is_null() && k->oop_is_instance()) {
154 methodOop m = instanceKlass::cast(k())->method_with_idnum(slot);
155 return init_method_MemberName(mname, m, false, k);
156 }
157 } else if (target_klass == SystemDictionary::MemberName_klass()) {
158 // Note: This only works if the MemberName has already been resolved.
159 oop clazz = java_lang_invoke_MemberName::clazz(target_oop);
160 int flags = java_lang_invoke_MemberName::flags(target_oop);
161 oop vmtarget = java_lang_invoke_MemberName::vmtarget(target_oop);
162 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(target_oop);
163 KlassHandle k(thread, java_lang_Class::as_klassOop(clazz));
164 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
165 if (vmtarget == NULL) return NULL; // not resolved
166 if ((flags & IS_FIELD) != 0) {
167 assert(vmtarget->is_klass(), "field vmtarget is klassOop");
168 int basic_mods = (ref_kind_is_static(ref_kind) ? JVM_ACC_STATIC : 0);
169 // FIXME: how does k (receiver_limit) contribute?
170 KlassHandle k_vmtarget(thread, klassOop(vmtarget));
171 return init_field_MemberName(mname, k_vmtarget, accessFlags_from(basic_mods), NULL, NULL, vmindex);
172 } else if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
173 assert(vmtarget->is_method(), "method or constructor vmtarget is methodOop");
174 return init_method_MemberName(mname, methodOop(vmtarget), ref_kind_does_dispatch(ref_kind), k);
175 } else {
176 return NULL;
177 }
178 }
179 return NULL;
180 }
181
182 oop MethodHandles::init_method_MemberName(Handle mname, methodOop m, bool do_dispatch,
183 KlassHandle resolved_klass_h) {
184 klassOop resolved_klass = resolved_klass_h();
185 AccessFlags mods = m->access_flags();
186 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
187 int vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch
188 bool is_itable_call = false;
189 klassOop m_klass = m->method_holder();
190 // resolved_klass is a copy of CallInfo::resolved_klass, if available
191 if (resolved_klass == NULL)
192 resolved_klass = m_klass;
193 if (m->is_initializer()) {
194 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
195 } else if (mods.is_static()) {
196 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
197 } else if (resolved_klass != m_klass &&
198 !Klass::cast(resolved_klass)->is_subtype_of(m_klass)) {
199 return NULL; // bad receiver limit
200 } else if (Klass::cast(resolved_klass)->is_interface() &&
201 Klass::cast(m_klass)->is_interface()) {
202 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
203 vmindex = klassItable::compute_itable_index(m);
204 is_itable_call = true;
205 } else if (m_klass != resolved_klass && Klass::cast(m_klass)->is_interface()) {
206 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
207 // it is a miranda method, so m->vtable_index is not what we want
208 ResourceMark rm;
209 klassVtable* vt = instanceKlass::cast(resolved_klass)->vtable();
210 vmindex = vt->index_of_miranda(m->name(), m->signature());
211 } else if (!do_dispatch || m->can_be_statically_bound()) {
212 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
213 } else {
214 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
215 vmindex = m->vtable_index();
216 }
217
218 if (vmindex >= 0 && !is_itable_call) {
219 if (Klass::cast(m_klass)->is_interface()) {
220 // This is a vtable call to an interface method (abstract "miranda method").
221 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
222 // (LinkResolver should help us figure this out.)
223 KlassHandle m_klass_non_interface = resolved_klass;
224 if (m_klass_non_interface->is_interface()) {
225 m_klass_non_interface = SystemDictionary::Object_klass();
226 #ifdef ASSERT
227 { ResourceMark rm;
228 methodOop m2 = m_klass_non_interface->vtable()->method_at(vmindex);
229 assert(m->name() == m2->name() && m->signature() == m2->signature(),
230 err_msg("at %d, %s != %s", vmindex,
231 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
232 }
233 #endif //ASSERT
234 }
235 if (!m->is_public()) {
236 assert(m->is_public(), "virtual call must be to public interface method");
237 return NULL; // elicit an error later in product build
238 }
239 assert(Klass::cast(resolved_klass)->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
240 m_klass = m_klass_non_interface();
241 }
242 }
243
244 oop mname_oop = mname();
245 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
246 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m);
247 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
248 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(m_klass)->java_mirror());
249 // Note: name and type can be lazily computed by resolve_MemberName,
250 // if Java code needs them as resolved String and MethodType objects.
251 // The clazz must be eagerly stored, because it provides a GC
252 // root to help keep alive the methodOop.
253 // If relevant, the vtable or itable value is stored as vmindex.
254 // This is done eagerly, since it is readily available without
255 // constructing any new objects.
256
257 if (instanceKlass::cast(m->method_holder())->add_member_name(mname)) {
258 return mname();
259 } else {
260 // Redefinition caused this to fail. Return NULL (and an exception?)
261 return NULL;
262 }
263 }
264
265 Handle MethodHandles::init_method_MemberName(Handle mname, CallInfo& info, TRAPS) {
266 Handle empty;
267 if (info.resolved_appendix().not_null()) {
268 // The resolved MemberName must not be accompanied by an appendix argument,
269 // since there is no way to bind this value into the MemberName.
270 // Caller is responsible to prevent this from happening.
271 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
272 }
273 methodHandle m = info.resolved_method();
274 KlassHandle defc = info.resolved_klass();
275 int vmindex = -1;
276 if (defc->is_interface() && Klass::cast(m->method_holder())->is_interface()) {
277 // LinkResolver does not report itable indexes! (fix this?)
278 vmindex = klassItable::compute_itable_index(m());
279 } else if (m->can_be_statically_bound()) {
280 // LinkResolver reports vtable index even for final methods!
281 vmindex = methodOopDesc::nonvirtual_vtable_index;
282 } else {
283 vmindex = info.vtable_index();
284 }
285 oop res = init_method_MemberName(mname, m(), (vmindex >= 0), defc());
286 assert(res == NULL || (java_lang_invoke_MemberName::vmindex(res) == vmindex), "");
287 return Handle(THREAD, res);
288 }
289
290 oop MethodHandles::init_field_MemberName(Handle mname, KlassHandle field_holder,
291 AccessFlags mods, oop type, oop name,
292 intptr_t offset, bool is_setter) {
293 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
294 flags |= IS_FIELD | ((mods.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
295 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
296 oop vmtarget = field_holder();
297 int vmindex = offset; // determines the field uniquely when combined with static bit
298 oop mname_oop = mname();
299 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
300 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
301 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
302 java_lang_invoke_MemberName::set_clazz(mname_oop, field_holder()->java_mirror());
303 if (name != NULL)
304 java_lang_invoke_MemberName::set_name(mname_oop, name);
305 if (type != NULL)
306 java_lang_invoke_MemberName::set_type(mname_oop, type);
307 // Note: name and type can be lazily computed by resolve_MemberName,
308 // if Java code needs them as resolved String and Class objects.
309 // Note that the incoming type oop might be pre-resolved (non-null).
310 // The base clazz and field offset (vmindex) must be eagerly stored,
311 // because they unambiguously identify the field.
312 // Although the fieldDescriptor::_index would also identify the field,
313 // we do not use it, because it is harder to decode.
314 return mname();
315 }
316
317 Handle MethodHandles::init_field_MemberName(Handle mname, FieldAccessInfo& info, TRAPS) {
318 return Handle();
319 #if 0
320 KlassHandle field_holder = info.klass();
321 intptr_t field_offset = info.field_offset();
322 return init_field_MemberName(mname_oop, field_holder(),
323 info.access_flags(),
324 type, name,
325 field_offset, false /*is_setter*/);
326 #endif
327 }
328
329
330 // JVM 2.9 Special Methods:
331 // A method is signature polymorphic if and only if all of the following conditions hold :
332 // * It is declared in the java.lang.invoke.MethodHandle class.
333 // * It has a single formal parameter of type Object[].
334 // * It has a return type of Object.
335 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
336 bool MethodHandles::is_method_handle_invoke_name(klassOop klass, Symbol* name) {
337 if (klass == NULL)
338 return false;
339 // The following test will fail spuriously during bootstrap of MethodHandle itself:
340 // if (klass != SystemDictionary::MethodHandle_klass())
341 // Test the name instead:
342 if (Klass::cast(klass)->name() != vmSymbols::java_lang_invoke_MethodHandle())
343 return false;
344 Symbol* poly_sig = vmSymbols::object_array_object_signature();
345 methodOop m = instanceKlass::cast(klass)->find_method(name, poly_sig);
346 if (m == NULL) return false;
347 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
348 int flags = m->access_flags().as_int();
349 return (flags & required) == required;
350 }
351
352
353 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
354 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
355 switch (iid) {
356 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
357 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
358 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
359 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
360 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
361 }
362 assert(false, "");
363 return 0;
364 }
365
366 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
367 switch (iid) {
368 case vmIntrinsics::_invokeBasic: return 0;
369 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
370 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
371 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
372 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
373 }
374 assert(false, err_msg("iid=%d", iid));
375 return 0;
376 }
377
378 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
379 vmSymbols::SID name_id = vmSymbols::find_sid(name);
380 switch (name_id) {
381 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
382 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
383 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
384 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
385
386 // There is one static signature-polymorphic method for each JVM invocation mode.
387 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
388 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
389 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
390 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
391 }
392
393 // Cover the case of invokeExact and any future variants of invokeFoo.
394 klassOop mh_klass = SystemDictionary::well_known_klass(
395 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
396 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
397 return vmIntrinsics::_invokeGeneric;
398
399 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
400 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
401 return vmIntrinsics::_none;
402 }
403
404 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(klassOop klass, Symbol* name) {
405 if (klass != NULL &&
406 Klass::cast(klass)->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
407 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
408 if (iid != vmIntrinsics::_none)
409 return iid;
410 if (is_method_handle_invoke_name(klass, name))
411 return vmIntrinsics::_invokeGeneric;
412 }
413 return vmIntrinsics::_none;
414 }
415
416
417 // convert the external string or reflective type to an internal signature
418 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
419 if (java_lang_invoke_MethodType::is_instance(type_str)) {
420 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
421 } else if (java_lang_Class::is_instance(type_str)) {
422 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
423 } else if (java_lang_String::is_instance(type_str)) {
424 if (intern_if_not_found) {
425 return java_lang_String::as_symbol(type_str, CHECK_NULL);
426 } else {
427 return java_lang_String::as_symbol_or_null(type_str);
428 }
429 } else {
430 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
431 }
432 }
433
434 static const char OBJ_SIG[] = "Ljava/lang/Object;";
435 enum { OBJ_SIG_LEN = 18 };
436
437 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
438 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
439 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
440 const int len = sig->utf8_length();
441 for (int i = 0; i < len; i++) {
442 switch (sig->byte_at(i)) {
443 case 'L':
444 // only java/lang/Object is valid here
445 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
446 return false;
447 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
448 continue;
449 case '(': case ')': case 'V':
450 case 'I': case 'J': case 'F': case 'D':
451 continue;
452 //case '[':
453 //case 'Z': case 'B': case 'C': case 'S':
454 default:
455 return false;
456 }
457 }
458 return true;
459 }
460
461 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
462 Symbol* bsig = NULL;
463 if (sig == NULL) {
464 return sig;
465 } else if (is_basic_type_signature(sig)) {
466 sig->increment_refcount();
467 return sig; // that was easy
468 } else if (sig->byte_at(0) != '(') {
469 BasicType bt = char2type(sig->byte_at(0));
470 if (is_subword_type(bt)) {
471 bsig = vmSymbols::int_signature();
472 } else {
473 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
474 bsig = vmSymbols::object_signature();
475 }
476 } else {
477 ResourceMark rm;
478 stringStream buffer(128);
479 buffer.put('(');
480 int arg_pos = 0, keep_arg_pos = -1;
481 if (keep_last_arg)
482 keep_arg_pos = ArgumentCount(sig).size() - 1;
483 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
484 BasicType bt = ss.type();
485 size_t this_arg_pos = buffer.size();
486 if (ss.at_return_type()) {
487 buffer.put(')');
488 }
489 if (arg_pos == keep_arg_pos) {
490 buffer.write((char*) ss.raw_bytes(),
491 (int) ss.raw_length());
492 } else if (bt == T_OBJECT || bt == T_ARRAY) {
493 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
494 } else {
495 if (is_subword_type(bt))
496 bt = T_INT;
497 buffer.put(type2char(bt));
498 }
499 arg_pos++;
500 }
501 const char* sigstr = buffer.base();
502 int siglen = (int) buffer.size();
503 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
504 }
505 assert(is_basic_type_signature(bsig) ||
506 // detune assert in case the injected argument is not a basic type:
507 keep_last_arg, "");
508 return bsig;
509 }
510
511 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
512 Symbol* sig,
513 bool keep_arrays,
514 bool keep_basic_names) {
515 st = st ? st : tty;
516 int len = sig->utf8_length();
517 int array = 0;
518 bool prev_type = false;
519 for (int i = 0; i < len; i++) {
520 char ch = sig->byte_at(i);
521 switch (ch) {
522 case '(': case ')':
523 prev_type = false;
524 st->put(ch);
525 continue;
526 case '[':
527 if (!keep_basic_names && keep_arrays)
528 st->put(ch);
529 array++;
530 continue;
531 case 'L':
532 {
533 if (prev_type) st->put(',');
534 int start = i+1, slash = start;
535 while (++i < len && (ch = sig->byte_at(i)) != ';') {
536 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
537 }
538 if (slash < i) start = slash;
539 if (!keep_basic_names) {
540 st->put('L');
541 } else {
542 for (int j = start; j < i; j++)
543 st->put(sig->byte_at(j));
544 prev_type = true;
545 }
546 break;
547 }
548 default:
549 {
550 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
551 ch = '[';
552 array = 0;
553 }
554 if (prev_type) st->put(',');
555 const char* n = NULL;
556 if (keep_basic_names)
557 n = type2name(char2type(ch));
558 if (n == NULL) {
559 // unknown letter, or we don't want to know its name
560 st->put(ch);
561 } else {
562 st->print(n);
563 prev_type = true;
564 }
565 break;
566 }
567 }
568 // Switch break goes here to take care of array suffix:
569 if (prev_type) {
570 while (array > 0) {
571 st->print("[]");
572 --array;
573 }
574 }
575 array = 0;
576 }
577 }
578
579
580
581 static oop object_java_mirror() {
582 return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
583 }
584
585 static oop field_name_or_null(Symbol* s) {
586 if (s == NULL) return NULL;
587 return StringTable::lookup(s);
588 }
589
590 static oop field_signature_type_or_null(Symbol* s) {
591 if (s == NULL) return NULL;
592 BasicType bt = FieldType::basic_type(s);
593 if (is_java_primitive(bt)) {
594 assert(s->utf8_length() == 1, "");
595 return java_lang_Class::primitive_mirror(bt);
596 }
597 // Here are some more short cuts for common types.
598 // They are optional, since reference types can be resolved lazily.
599 if (bt == T_OBJECT) {
600 if (s == vmSymbols::object_signature()) {
601 return object_java_mirror();
602 } else if (s == vmSymbols::class_signature()) {
603 return Klass::cast(SystemDictionary::Class_klass())->java_mirror();
604 } else if (s == vmSymbols::string_signature()) {
605 return Klass::cast(SystemDictionary::String_klass())->java_mirror();
606 }
607 }
608 return NULL;
609 }
610
611 // An unresolved member name is a mere symbolic reference.
612 // Resolving it plants a vmtarget/vmindex in it,
613 // which refers dirctly to JVM internals.
614 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
615 Handle empty;
616 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
617
618 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
619 // Already resolved.
620 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
621 assert(vmindex >= methodOopDesc::nonvirtual_vtable_index, "");
622 return mname;
623 }
624
625 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
626 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
627 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
628 int flags = java_lang_invoke_MemberName::flags(mname());
629 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
630 if (!ref_kind_is_valid(ref_kind)) {
631 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
632 }
633
634 DEBUG_ONLY(int old_vmindex);
635 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
636
637 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
638 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
639 }
640
641 instanceKlassHandle defc;
642 {
643 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop());
644 if (defc_klassOop == NULL) return empty; // a primitive; no resolution possible
645 if (!Klass::cast(defc_klassOop)->oop_is_instance()) {
646 if (!Klass::cast(defc_klassOop)->oop_is_array()) return empty;
647 defc_klassOop = SystemDictionary::Object_klass();
648 }
649 defc = instanceKlassHandle(THREAD, defc_klassOop);
650 }
651 if (defc.is_null()) {
652 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
653 }
654 defc->link_class(CHECK_(empty)); // possible safepoint
655
656 // convert the external string name to an internal symbol
657 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
658 if (name == NULL) return empty; // no such name
659 if (name == vmSymbols::class_initializer_name())
660 return empty; // illegal name
661
662 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
663 if ((flags & ALL_KINDS) == IS_METHOD &&
664 (defc() == SystemDictionary::MethodHandle_klass()) &&
665 (ref_kind == JVM_REF_invokeVirtual ||
666 ref_kind == JVM_REF_invokeSpecial ||
667 // static invocation mode is required for _linkToVirtual, etc.:
668 ref_kind == JVM_REF_invokeStatic)) {
669 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
670 if (iid != vmIntrinsics::_none &&
671 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
672 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
673 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
674 mh_invoke_id = iid;
675 }
676 }
677
678 // convert the external string or reflective type to an internal signature
679 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
680 if (type == NULL) return empty; // no such signature exists in the VM
681
682 // Time to do the lookup.
683 switch (flags & ALL_KINDS) {
684 case IS_METHOD:
685 {
686 CallInfo result;
687 bool do_dispatch = true; // default, neutral setting
688 {
689 assert(!HAS_PENDING_EXCEPTION, "");
690 if (ref_kind == JVM_REF_invokeStatic) {
691 //do_dispatch = false; // no need, since statics are never dispatched
692 LinkResolver::resolve_static_call(result,
693 defc, name, type, caller, caller.not_null(), false, THREAD);
694 } else if (ref_kind == JVM_REF_invokeInterface) {
695 LinkResolver::resolve_interface_call(result, Handle(), defc,
696 defc, name, type, caller, caller.not_null(), false, THREAD);
697 } else if (mh_invoke_id != vmIntrinsics::_none) {
698 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
699 LinkResolver::resolve_handle_call(result,
700 defc, name, type, caller, THREAD);
701 } else if (ref_kind == JVM_REF_invokeSpecial) {
702 do_dispatch = false; // force non-virtual linkage
703 LinkResolver::resolve_special_call(result,
704 defc, name, type, caller, caller.not_null(), THREAD);
705 // CR 8029533:
706 // As a corner case, invokespecial can return a method *below* its resolved_klass.
707 // Since method search *starts* at the resolved_klass, the eventual
708 // method is almost always in a supertype *above* the resolved_klass.
709 // This pattern breaks when an invokespecial "over-reaches" beyond an
710 // immediate super to a method overridden by a super class.
711 // In that case, the selected method will be below the resolved_klass.
712 // (This is the behavior enabled by the famous ACC_SUPER classfile flag.)
713 //
714 // Downstream of this code, we make assumptions about resolved_klass being below m.
715 // (See init_method_MemberName, the comment "bad receiver limit".)
716 // We basically want to patch result._resolved_klass to be m.method_holder().
717 // The simplest way to get this happier outcome is to re-resolve.
718 if (!HAS_PENDING_EXCEPTION &&
719 caller.not_null() &&
720 result.resolved_method().not_null()) {
721 // this is the m_klass value that will be checked later:
722 klassOop m_klass = result.resolved_method()->method_holder();
723 if (m_klass != result.resolved_klass()() &&
724 Klass::cast(m_klass)->is_subtype_of(result.resolved_klass()())) {
725 KlassHandle adjusted_defc(THREAD, m_klass);
726 LinkResolver::resolve_special_call(result,
727 adjusted_defc, name, type, caller, caller.not_null(), THREAD);
728 assert(HAS_PENDING_EXCEPTION // if there is something like an OOM, pass it up to caller
729 || result.resolved_method()->method_holder() == adjusted_defc(),
730 "same method, different resolved_klass");
731 }
732 }
733 } else if (ref_kind == JVM_REF_invokeVirtual) {
734 LinkResolver::resolve_virtual_call(result, Handle(), defc,
735 defc, name, type, caller, caller.not_null(), false, THREAD);
736 } else {
737 assert(false, err_msg("ref_kind=%d", ref_kind));
738 }
739 if (HAS_PENDING_EXCEPTION) {
740 return empty;
741 }
742 }
743 return init_method_MemberName(mname, result, THREAD);
744 }
745 case IS_CONSTRUCTOR:
746 {
747 CallInfo result;
748 {
749 assert(!HAS_PENDING_EXCEPTION, "");
750 if (name == vmSymbols::object_initializer_name()) {
751 LinkResolver::resolve_special_call(result,
752 defc, name, type, caller, caller.not_null(), THREAD);
753 } else {
754 break; // will throw after end of switch
755 }
756 if (HAS_PENDING_EXCEPTION) {
757 return empty;
758 }
759 }
760 assert(result.is_statically_bound(), "");
761 return init_method_MemberName(mname, result, THREAD);
762 }
763 case IS_FIELD:
764 {
765 // This is taken from LinkResolver::resolve_field, sans access checks.
766 fieldDescriptor fd; // find_field initializes fd if found
767 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd));
768 // check if field exists; i.e., if a klass containing the field def has been selected
769 if (sel_klass.is_null()) return empty; // should not happen
770 oop type = field_signature_type_or_null(fd.signature());
771 oop name = field_name_or_null(fd.name());
772 bool is_setter = (ref_kind_is_valid(ref_kind) && ref_kind_is_setter(ref_kind));
773 mname = Handle(THREAD,
774 init_field_MemberName(mname, sel_klass,
775 fd.access_flags(), type, name, fd.offset(), is_setter));
776 return mname;
777 }
778 default:
779 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
780 }
781
782 return empty;
783 }
784
785 // Conversely, a member name which is only initialized from JVM internals
786 // may have null defc, name, and type fields.
787 // Resolving it plants a vmtarget/vmindex in it,
788 // which refers directly to JVM internals.
789 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
790 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
791 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
792 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
793 if (vmtarget == NULL) {
794 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
795 }
796
797 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
798 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
799 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
800 int flags = java_lang_invoke_MemberName::flags(mname());
801
802 if (suppress != 0) {
803 if (suppress & _suppress_defc) have_defc = true;
804 if (suppress & _suppress_name) have_name = true;
805 if (suppress & _suppress_type) have_type = true;
806 }
807
808 if (have_defc && have_name && have_type) return; // nothing needed
809
810 switch (flags & ALL_KINDS) {
811 case IS_METHOD:
812 case IS_CONSTRUCTOR:
813 {
814 assert(vmtarget->is_method(), "method or constructor vmtarget is methodOop");
815 methodHandle m(THREAD, methodOop(vmtarget));
816 DEBUG_ONLY(vmtarget = NULL); // safety
817 if (m.is_null()) break;
818 if (!have_defc) {
819 klassOop defc = m->method_holder();
820 java_lang_invoke_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror());
821 }
822 if (!have_name) {
823 //not java_lang_String::create_from_symbol; let's intern member names
824 Handle name = StringTable::intern(m->name(), CHECK);
825 java_lang_invoke_MemberName::set_name(mname(), name());
826 }
827 if (!have_type) {
828 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
829 java_lang_invoke_MemberName::set_type(mname(), type());
830 }
831 return;
832 }
833 case IS_FIELD:
834 {
835 // This is taken from LinkResolver::resolve_field, sans access checks.
836 assert(vmtarget->is_klass(), "field vmtarget is klassOop");
837 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break;
838 instanceKlassHandle defc(THREAD, (klassOop) vmtarget);
839 DEBUG_ONLY(vmtarget = NULL); // safety
840 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
841 fieldDescriptor fd; // find_field initializes fd if found
842 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
843 break; // cannot expand
844 if (!have_defc) {
845 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
846 }
847 if (!have_name) {
848 //not java_lang_String::create_from_symbol; let's intern member names
849 Handle name = StringTable::intern(fd.name(), CHECK);
850 java_lang_invoke_MemberName::set_name(mname(), name());
851 }
852 if (!have_type) {
853 // If it is a primitive field type, don't mess with short strings like "I".
854 Handle type = field_signature_type_or_null(fd.signature());
855 if (type.is_null()) {
856 java_lang_String::create_from_symbol(fd.signature(), CHECK);
857 }
858 java_lang_invoke_MemberName::set_type(mname(), type());
859 }
860 return;
861 }
862 }
863 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
864 }
865
866 int MethodHandles::find_MemberNames(KlassHandle k,
867 Symbol* name, Symbol* sig,
868 int mflags, KlassHandle caller,
869 int skip, objArrayHandle results) {
870
871 // %%% take caller into account!
872
873 Thread* thread = Thread::current();
874
875 if (k.is_null() || !k->oop_is_instance()) return -1;
876
877 int rfill = 0, rlimit = results->length(), rskip = skip;
878 // overflow measurement:
879 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
880
881 int match_flags = mflags;
882 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
883 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
884 bool local_only = !(search_superc | search_intfc);
885 bool classes_only = false;
886
887 if (name != NULL) {
888 if (name->utf8_length() == 0) return 0; // a match is not possible
889 }
890 if (sig != NULL) {
891 if (sig->utf8_length() == 0) return 0; // a match is not possible
892 if (sig->byte_at(0) == '(')
893 match_flags &= ~(IS_FIELD | IS_TYPE);
894 else
895 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
896 }
897
898 if ((match_flags & IS_TYPE) != 0) {
899 // NYI, and Core Reflection works quite well for this query
900 }
901
902 if ((match_flags & IS_FIELD) != 0) {
903 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
904 if (name != NULL && st.name() != name)
905 continue;
906 if (sig != NULL && st.signature() != sig)
907 continue;
908 // passed the filters
909 if (rskip > 0) {
910 --rskip;
911 } else if (rfill < rlimit) {
912 Handle result(thread, results->obj_at(rfill++));
913 if (!java_lang_invoke_MemberName::is_instance(result()))
914 return -99; // caller bug!
915 oop type = field_signature_type_or_null(st.signature());
916 oop name = field_name_or_null(st.name());
917 oop saved = MethodHandles::init_field_MemberName(result, st.klass(),
918 st.access_flags(), type, name,
919 st.offset());
920 if (saved != result())
921 results->obj_at_put(rfill-1, saved); // show saved instance to user
922 } else if (++overflow >= overflow_limit) {
923 match_flags = 0; break; // got tired of looking at overflow
924 }
925 }
926 }
927
928 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
929 // watch out for these guys:
930 Symbol* init_name = vmSymbols::object_initializer_name();
931 Symbol* clinit_name = vmSymbols::class_initializer_name();
932 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
933 bool negate_name_test = false;
934 // fix name so that it captures the intention of IS_CONSTRUCTOR
935 if (!(match_flags & IS_METHOD)) {
936 // constructors only
937 if (name == NULL) {
938 name = init_name;
939 } else if (name != init_name) {
940 return 0; // no constructors of this method name
941 }
942 } else if (!(match_flags & IS_CONSTRUCTOR)) {
943 // methods only
944 if (name == NULL) {
945 name = init_name;
946 negate_name_test = true; // if we see the name, we *omit* the entry
947 } else if (name == init_name) {
948 return 0; // no methods of this constructor name
949 }
950 } else {
951 // caller will accept either sort; no need to adjust name
952 }
953 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
954 methodOop m = st.method();
955 Symbol* m_name = m->name();
956 if (m_name == clinit_name)
957 continue;
958 if (name != NULL && ((m_name != name) ^ negate_name_test))
959 continue;
960 if (sig != NULL && m->signature() != sig)
961 continue;
962 // passed the filters
963 if (rskip > 0) {
964 --rskip;
965 } else if (rfill < rlimit) {
966 Handle result(thread, results->obj_at(rfill++));
967 if (!java_lang_invoke_MemberName::is_instance(result()))
968 return -99; // caller bug!
969 oop saved = MethodHandles::init_method_MemberName(result, m, true, KlassHandle());
970 if (saved != result())
971 results->obj_at_put(rfill-1, saved); // show saved instance to user
972 } else if (++overflow >= overflow_limit) {
973 match_flags = 0; break; // got tired of looking at overflow
974 }
975 }
976 }
977
978 // return number of elements we at leasted wanted to initialize
979 return rfill + overflow;
980 }
981
982 //------------------------------------------------------------------------------
983 // MemberNameTable
984 //
985
986 MemberNameTable::MemberNameTable(int methods_cnt)
987 : GrowableArray<jweak>(methods_cnt, true) {
988 assert_locked_or_safepoint(MemberNameTable_lock);
989 }
990
991 MemberNameTable::~MemberNameTable() {
992 assert_locked_or_safepoint(MemberNameTable_lock);
993 int len = this->length();
994
995 for (int idx = 0; idx < len; idx++) {
996 jweak ref = this->at(idx);
997 JNIHandles::destroy_weak_global(ref);
998 }
999 }
1000
1001 void MemberNameTable::add_member_name(jweak mem_name_wref) {
1002 assert_locked_or_safepoint(MemberNameTable_lock);
1003 this->push(mem_name_wref);
1004 }
1005
1006
1007 // It is called at safepoint only for RedefineClasses
1008 void MemberNameTable::adjust_method_entries(methodOop* old_methods, methodOop* new_methods,
1009 int methods_length, bool *trace_name_printed) {
1010 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
1011 // For each redefined method
1012 for (int j = 0; j < methods_length; j++) {
1013 methodOop old_method = old_methods[j];
1014 methodOop new_method = new_methods[j];
1015 // search the MemberNameTable for uses of either obsolete or EMCP methods
1016 for (int idx = 0; idx < length(); idx++) {
1017 oop mem_name = JNIHandles::resolve(this->at(idx));
1018 if (mem_name != NULL) {
1019 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, old_method, new_method,
1020 trace_name_printed);
1021 }
1022 }
1023 }
1024 }
1025
1026 //
1027 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1028 // They are the private interface between this JVM and the HotSpot-specific
1029 // Java code that implements JSR 292 method handles.
1030 //
1031 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1032 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1033 //
1034 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
1035 switch (which) {
1036 case MethodHandles::GC_COUNT_GWT:
1037 #ifdef COMPILER2
1038 return true;
1039 #else
1040 return false;
1041 #endif
1042 }
1043 return 0;
1044 }
1045 JVM_END
1046
1047 #ifndef PRODUCT
1048 #define EACH_NAMED_CON(template, requirement) \
1049 template(MethodHandles,GC_COUNT_GWT) \
1050 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1051 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1052 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1053 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1054 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1055 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1056 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1057 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1058 template(MethodHandles,GC_LAMBDA_SUPPORT) \
1059 /*end*/
1060
1061 #define IGNORE_REQ(req_expr) /* req_expr */
1062 #define ONE_PLUS(scope,value) 1+
1063 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1064 #define VALUE_COMMA(scope,value) scope::value,
1065 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1066 #define STRING_NULL(scope,value) #value "\0"
1067 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1068
1069 static bool advertise_con_value(int which) {
1070 if (which < 0) return false;
1071 bool ok = true;
1072 int count = 0;
1073 #define INC_COUNT(scope,value) \
1074 ++count;
1075 #define CHECK_REQ(req_expr) \
1076 if (which < count) return ok; \
1077 ok = (req_expr);
1078 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1079 #undef INC_COUNT
1080 #undef CHECK_REQ
1081 assert(count == con_value_count, "");
1082 if (which < count) return ok;
1083 return false;
1084 }
1085
1086 #undef ONE_PLUS
1087 #undef VALUE_COMMA
1088 #undef STRING_NULL
1089 #undef EACH_NAMED_CON
1090 #endif // PRODUCT
1091
1092 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1093 #ifndef PRODUCT
1094 if (advertise_con_value(which)) {
1095 assert(which >= 0 && which < con_value_count, "");
1096 int con = con_values[which];
1097 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1098 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1099 const char* str = &con_names[0];
1100 for (int i = 0; i < which; i++)
1101 str += strlen(str) + 1; // skip name and null
1102 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1103 box->obj_at_put(0, name);
1104 }
1105 return con;
1106 }
1107 #endif
1108 return 0;
1109 }
1110 JVM_END
1111
1112 // void init(MemberName self, AccessibleObject ref)
1113 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1114 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1115 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1116 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1117 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1118 MethodHandles::init_MemberName(mname, target);
1119 }
1120 JVM_END
1121
1122 // void expand(MemberName self)
1123 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1124 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1125 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1126 MethodHandles::expand_MemberName(mname, 0, CHECK);
1127 }
1128 JVM_END
1129
1130 // void resolve(MemberName self, Class<?> caller)
1131 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1132 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1133 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1134
1135 // The trusted Java code that calls this method should already have performed
1136 // access checks on behalf of the given caller. But, we can verify this.
1137 if (VerifyMethodHandles && caller_jh != NULL &&
1138 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1139 klassOop reference_klass = java_lang_Class::as_klassOop(java_lang_invoke_MemberName::clazz(mname()));
1140 if (reference_klass != NULL && Klass::cast(reference_klass)->oop_is_objArray()) {
1141 reference_klass = objArrayKlass::cast(reference_klass)->bottom_klass();
1142 }
1143
1144 // Reflection::verify_class_access can only handle instance classes.
1145 if (reference_klass != NULL && Klass::cast(reference_klass)->oop_is_instance()) {
1146 // Emulate LinkResolver::check_klass_accessability.
1147 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh));
1148 if (!Reflection::verify_class_access(caller,
1149 reference_klass,
1150 true)) {
1151 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name());
1152 }
1153 }
1154 }
1155
1156 KlassHandle caller(THREAD,
1157 caller_jh == NULL ? (klassOop) NULL :
1158 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)));
1159 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1160
1161 if (resolved.is_null()) {
1162 int flags = java_lang_invoke_MemberName::flags(mname());
1163 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1164 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1165 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1166 }
1167 if ((flags & ALL_KINDS) == IS_FIELD) {
1168 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1169 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1170 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1171 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1172 } else {
1173 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1174 }
1175 }
1176
1177 return JNIHandles::make_local(THREAD, resolved());
1178 }
1179 JVM_END
1180
1181 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1182 if (mname == NULL ||
1183 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1184 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1185 } else {
1186 int flags = java_lang_invoke_MemberName::flags(mname);
1187 if ((flags & IS_FIELD) != 0 &&
1188 (must_be_static
1189 ? (flags & JVM_ACC_STATIC) != 0
1190 : (flags & JVM_ACC_STATIC) == 0)) {
1191 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1192 return (jlong) vmindex;
1193 }
1194 }
1195 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1196 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1197 return 0;
1198 }
1199
1200 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1201 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1202 }
1203 JVM_END
1204
1205 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1206 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1207 }
1208 JVM_END
1209
1210 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1211 // use the other function to perform sanity checks:
1212 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1213 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1214 return JNIHandles::make_local(THREAD, clazz);
1215 }
1216 JVM_END
1217
1218 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1219 if (mname_jh == NULL) return NULL;
1220 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1221 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1222 Handle vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1223 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1224 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1225 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1226 result->obj_at_put(0, x);
1227 x = NULL;
1228 if (vmtarget.is_null() || vmtarget->is_instance()) {
1229 x = vmtarget();
1230 } else if (vmtarget->is_klass()) {
1231 x = Klass::cast((klassOop) vmtarget())->java_mirror();
1232 } else {
1233 if (vmtarget->is_method()) {
1234 x = mname();
1235 } else {
1236 Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL);
1237 x = MethodHandles::init_MemberName(mname2(), vmtarget());
1238 }
1239 }
1240 result->obj_at_put(1, x);
1241 return JNIHandles::make_local(env, result());
1242 }
1243 JVM_END
1244
1245
1246
1247 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1248 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1249 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1250 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1251 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1252 if (clazz_jh == NULL || results_jh == NULL) return -1;
1253 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)));
1254
1255 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1256 if (results.is_null() || !results->is_objArray()) return -1;
1257
1258 TempNewSymbol name = NULL;
1259 TempNewSymbol sig = NULL;
1260 if (name_jh != NULL) {
1261 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1262 if (name == NULL) return 0; // a match is not possible
1263 }
1264 if (sig_jh != NULL) {
1265 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1266 if (sig == NULL) return 0; // a match is not possible
1267 }
1268
1269 KlassHandle caller;
1270 if (caller_jh != NULL) {
1271 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1272 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1273 caller = KlassHandle(THREAD, java_lang_Class::as_klassOop(caller_oop));
1274 }
1275
1276 if (name != NULL && sig != NULL && results.not_null()) {
1277 // try a direct resolve
1278 // %%% TO DO
1279 }
1280
1281 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1282 caller, skip, results);
1283 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1284 return res;
1285 }
1286 JVM_END
1287
1288 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1289 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1290 Handle target (THREAD, JNIHandles::resolve(target_jh));
1291 {
1292 // Walk all nmethods depending on this call site.
1293 MutexLocker mu(Compile_lock, thread);
1294 Universe::flush_dependents_on(call_site, target);
1295 java_lang_invoke_CallSite::set_target(call_site(), target());
1296 }
1297 }
1298 JVM_END
1299
1300 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1301 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1302 Handle target (THREAD, JNIHandles::resolve(target_jh));
1303 {
1304 // Walk all nmethods depending on this call site.
1305 MutexLocker mu(Compile_lock, thread);
1306 Universe::flush_dependents_on(call_site, target);
1307 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1308 }
1309 }
1310 JVM_END
1311
1312 /**
1313 * Throws a java/lang/UnsupportedOperationException unconditionally.
1314 * This is required by the specification of MethodHandle.invoke if
1315 * invoked directly.
1316 */
1317 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1318 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1319 return NULL;
1320 }
1321 JVM_END
1322
1323 /**
1324 * Throws a java/lang/UnsupportedOperationException unconditionally.
1325 * This is required by the specification of MethodHandle.invokeExact if
1326 * invoked directly.
1327 */
1328 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1329 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1330 return NULL;
1331 }
1332 JVM_END
1333
1334 /// JVM_RegisterMethodHandleMethods
1335
1336 #undef CS // Solaris builds complain
1337
1338 #define LANG "Ljava/lang/"
1339 #define JLINV "Ljava/lang/invoke/"
1340
1341 #define OBJ LANG"Object;"
1342 #define CLS LANG"Class;"
1343 #define STRG LANG"String;"
1344 #define CS JLINV"CallSite;"
1345 #define MT JLINV"MethodType;"
1346 #define MH JLINV"MethodHandle;"
1347 #define MEM JLINV"MemberName;"
1348
1349 #define CC (char*) /*cast a literal from (const char*)*/
1350 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1351
1352 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1353 static JNINativeMethod MHN_methods[] = {
1354 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1355 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1356 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1357 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1358 // static native int getNamedCon(int which, Object[] name)
1359 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1360 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1361 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1362 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1363 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1364 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1365 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1366 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1367 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1368 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1369 };
1370
1371 static JNINativeMethod MH_methods[] = {
1372 // UnsupportedOperationException throwers
1373 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1374 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1375 };
1376
1377 /**
1378 * Helper method to register native methods.
1379 */
1380 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1381 int status = env->RegisterNatives(clazz, methods, nMethods);
1382 if (status != JNI_OK || env->ExceptionOccurred()) {
1383 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1384 env->ExceptionClear();
1385 return false;
1386 }
1387 return true;
1388 }
1389
1390 /**
1391 * This one function is exported, used by NativeLookup.
1392 */
1393 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1394 if (!EnableInvokeDynamic) {
1395 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
1396 return; // bind nothing
1397 }
1398
1399 assert(!MethodHandles::enabled(), "must not be enabled");
1400 bool enable_MH = true;
1401
1402 jclass MH_class = NULL;
1403 if (SystemDictionary::MethodHandle_klass() == NULL) {
1404 enable_MH = false;
1405 } else {
1406 oop mirror = Klass::cast(SystemDictionary::MethodHandle_klass())->java_mirror();
1407 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1408 }
1409
1410 if (enable_MH) {
1411 ThreadToNativeFromVM ttnfv(thread);
1412
1413 if (enable_MH) {
1414 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1415 }
1416 if (enable_MH) {
1417 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1418 }
1419 }
1420
1421 if (TraceInvokeDynamic) {
1422 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1423 }
1424
1425 if (enable_MH) {
1426 MethodHandles::generate_adapters();
1427 MethodHandles::set_enabled(true);
1428 }
1429 }
1430 JVM_END