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--- old/src/share/vm/prims/methodHandles.cpp
+++ new/src/share/vm/prims/methodHandles.cpp
1 1 /*
2 2 * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
3 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 4 *
5 5 * This code is free software; you can redistribute it and/or modify it
6 6 * under the terms of the GNU General Public License version 2 only, as
7 7 * published by the Free Software Foundation.
8 8 *
9 9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 12 * version 2 for more details (a copy is included in the LICENSE file that
13 13 * accompanied this code).
14 14 *
15 15 * You should have received a copy of the GNU General Public License version
16 16 * 2 along with this work; if not, write to the Free Software Foundation,
17 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 18 *
19 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 20 * or visit www.oracle.com if you need additional information or have any
21 21 * questions.
22 22 *
23 23 */
24 24
25 25 #include "precompiled.hpp"
26 26 #include "classfile/symbolTable.hpp"
27 27 #include "compiler/compileBroker.hpp"
28 28 #include "interpreter/interpreter.hpp"
29 29 #include "interpreter/oopMapCache.hpp"
30 30 #include "memory/allocation.inline.hpp"
31 31 #include "memory/oopFactory.hpp"
32 32 #include "prims/methodHandles.hpp"
33 33 #include "runtime/compilationPolicy.hpp"
34 34 #include "runtime/javaCalls.hpp"
35 35 #include "runtime/reflection.hpp"
36 36 #include "runtime/signature.hpp"
37 37 #include "runtime/stubRoutines.hpp"
38 38
39 39
40 40 /*
41 41 * JSR 292 reference implementation: method handles
42 42 * The JDK 7 reference implementation represented method handle
43 43 * combinations as chains. Each link in the chain had a "vmentry"
44 44 * field which pointed at a bit of assembly code which performed
45 45 * one transformation before dispatching to the next link in the chain.
46 46 *
47 47 * The current reference implementation pushes almost all code generation
48 48 * responsibility to (trusted) Java code. A method handle contains a
49 49 * pointer to its "LambdaForm", which embodies all details of the method
50 50 * handle's behavior. The LambdaForm is a normal Java object, managed
51 51 * by a runtime coded in Java.
52 52 */
53 53
54 54 bool MethodHandles::_enabled = false; // set true after successful native linkage
55 55 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
56 56
57 57 //------------------------------------------------------------------------------
58 58 // MethodHandles::generate_adapters
59 59 //
60 60 void MethodHandles::generate_adapters() {
61 61 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
62 62
63 63 assert(_adapter_code == NULL, "generate only once");
64 64
65 65 ResourceMark rm;
66 66 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
67 67 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
68 68 if (_adapter_code == NULL)
69 69 vm_exit_out_of_memory(adapter_code_size, "CodeCache: no room for MethodHandles adapters");
70 70 {
71 71 CodeBuffer code(_adapter_code);
72 72 MethodHandlesAdapterGenerator g(&code);
73 73 g.generate();
74 74 code.log_section_sizes("MethodHandlesAdapterBlob");
75 75 }
76 76 }
77 77
78 78 //------------------------------------------------------------------------------
79 79 // MethodHandlesAdapterGenerator::generate
80 80 //
81 81 void MethodHandlesAdapterGenerator::generate() {
82 82 // Generate generic method handle adapters.
83 83 // Generate interpreter entries
84 84 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
85 85 mk <= Interpreter::method_handle_invoke_LAST;
86 86 mk = Interpreter::MethodKind(1 + (int)mk)) {
87 87 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
88 88 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
89 89 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
90 90 if (entry != NULL) {
91 91 Interpreter::set_entry_for_kind(mk, entry);
92 92 }
93 93 // If the entry is not set, it will throw AbstractMethodError.
94 94 }
95 95 }
96 96
97 97 void MethodHandles::set_enabled(bool z) {
98 98 if (_enabled != z) {
99 99 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
100 100 _enabled = z;
101 101 }
102 102 }
103 103
104 104 // MemberName support
105 105
106 106 // import java_lang_invoke_MemberName.*
107 107 enum {
108 108 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
109 109 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
110 110 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
111 111 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
112 112 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
113 113 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
114 114 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
115 115 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
116 116 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
117 117 };
118 118
119 119 Handle MethodHandles::new_MemberName(TRAPS) {
120 120 Handle empty;
121 121 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
122 122 if (!k->is_initialized()) k->initialize(CHECK_(empty));
123 123 return Handle(THREAD, k->allocate_instance(THREAD));
124 124 }
125 125
126 126 oop MethodHandles::init_MemberName(oop mname_oop, oop target_oop) {
127 127 Klass* target_klass = target_oop->klass();
128 128 if (target_klass == SystemDictionary::reflect_Field_klass()) {
129 129 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
130 130 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
131 131 int mods = java_lang_reflect_Field::modifiers(target_oop);
132 132 oop type = java_lang_reflect_Field::type(target_oop);
133 133 oop name = java_lang_reflect_Field::name(target_oop);
134 134 Klass* k = java_lang_Class::as_Klass(clazz);
135 135 intptr_t offset = InstanceKlass::cast(k)->field_offset(slot);
136 136 return init_field_MemberName(mname_oop, k, accessFlags_from(mods), type, name, offset);
137 137 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
138 138 oop clazz = java_lang_reflect_Method::clazz(target_oop);
139 139 int slot = java_lang_reflect_Method::slot(target_oop);
140 140 Klass* k = java_lang_Class::as_Klass(clazz);
141 141 if (k != NULL && Klass::cast(k)->oop_is_instance()) {
142 142 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
143 143 return init_method_MemberName(mname_oop, m, true, k);
144 144 }
145 145 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
146 146 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
147 147 int slot = java_lang_reflect_Constructor::slot(target_oop);
148 148 Klass* k = java_lang_Class::as_Klass(clazz);
149 149 if (k != NULL && Klass::cast(k)->oop_is_instance()) {
150 150 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
151 151 return init_method_MemberName(mname_oop, m, false, k);
152 152 }
153 153 } else if (target_klass == SystemDictionary::MemberName_klass()) {
154 154 // Note: This only works if the MemberName has already been resolved.
155 155 oop clazz = java_lang_invoke_MemberName::clazz(target_oop);
156 156 int flags = java_lang_invoke_MemberName::flags(target_oop);
157 157 Metadata* vmtarget=java_lang_invoke_MemberName::vmtarget(target_oop);
158 158 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(target_oop);
159 159 Klass* k = java_lang_Class::as_Klass(clazz);
160 160 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
161 161 if (vmtarget == NULL) return NULL; // not resolved
162 162 if ((flags & IS_FIELD) != 0) {
163 163 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
164 164 int basic_mods = (ref_kind_is_static(ref_kind) ? JVM_ACC_STATIC : 0);
165 165 // FIXME: how does k (receiver_limit) contribute?
166 166 return init_field_MemberName(mname_oop, (Klass*)vmtarget, accessFlags_from(basic_mods), NULL, NULL, vmindex);
167 167 } else if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
168 168 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
169 169 return init_method_MemberName(mname_oop, (Method*)vmtarget, ref_kind_does_dispatch(ref_kind), k);
170 170 } else {
171 171 return NULL;
172 172 }
173 173 }
174 174 return NULL;
175 175 }
176 176
177 177 oop MethodHandles::init_method_MemberName(oop mname_oop, Method* m, bool do_dispatch,
178 178 Klass* receiver_limit) {
179 179 AccessFlags mods = m->access_flags();
180 180 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
181 181 int vmindex = Method::nonvirtual_vtable_index; // implies never any dispatch
182 182 Klass* mklass = m->method_holder();
183 183 if (receiver_limit == NULL)
184 184 receiver_limit = mklass;
185 185 if (m->is_initializer()) {
186 186 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
187 187 } else if (mods.is_static()) {
188 188 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
189 189 } else if (receiver_limit != mklass &&
190 190 !Klass::cast(receiver_limit)->is_subtype_of(mklass)) {
191 191 return NULL; // bad receiver limit
192 192 } else if (Klass::cast(receiver_limit)->is_interface() &&
193 193 Klass::cast(mklass)->is_interface()) {
194 194 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
195 195 receiver_limit = mklass; // ignore passed-in limit; interfaces are interconvertible
196 196 vmindex = klassItable::compute_itable_index(m);
197 197 } else if (mklass != receiver_limit && Klass::cast(mklass)->is_interface()) {
198 198 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
199 199 // it is a miranda method, so m->vtable_index is not what we want
200 200 ResourceMark rm;
201 201 klassVtable* vt = InstanceKlass::cast(receiver_limit)->vtable();
202 202 vmindex = vt->index_of_miranda(m->name(), m->signature());
203 203 } else if (!do_dispatch || m->can_be_statically_bound()) {
204 204 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
205 205 } else {
206 206 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
207 207 vmindex = m->vtable_index();
208 208 }
209 209
210 210 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
211 211 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m);
212 212 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
213 213 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(receiver_limit)->java_mirror());
214 214 // Note: name and type can be lazily computed by resolve_MemberName,
215 215 // if Java code needs them as resolved String and MethodType objects.
216 216 // The clazz must be eagerly stored, because it provides a GC
217 217 // root to help keep alive the Method*.
218 218 // If relevant, the vtable or itable value is stored as vmindex.
219 219 // This is done eagerly, since it is readily available without
220 220 // constructing any new objects.
221 221 // TO DO: maybe intern mname_oop
222 222 return mname_oop;
223 223 }
224 224
225 225 Handle MethodHandles::init_method_MemberName(oop mname_oop, CallInfo& info, TRAPS) {
226 226 Handle empty;
227 227 if (info.resolved_appendix().not_null()) {
228 228 // The resolved MemberName must not be accompanied by an appendix argument,
229 229 // since there is no way to bind this value into the MemberName.
230 230 // Caller is responsible to prevent this from happening.
231 231 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
232 232 }
233 233 methodHandle m = info.resolved_method();
234 234 KlassHandle defc = info.resolved_klass();
235 235 int vmindex = -1;
236 236 if (defc->is_interface() && Klass::cast(m->method_holder())->is_interface()) {
237 237 // LinkResolver does not report itable indexes! (fix this?)
238 238 vmindex = klassItable::compute_itable_index(m());
239 239 } else if (m->can_be_statically_bound()) {
240 240 // LinkResolver reports vtable index even for final methods!
241 241 vmindex = Method::nonvirtual_vtable_index;
242 242 } else {
243 243 vmindex = info.vtable_index();
244 244 }
245 245 oop res = init_method_MemberName(mname_oop, m(), (vmindex >= 0), defc());
246 246 assert(res == NULL || (java_lang_invoke_MemberName::vmindex(res) == vmindex), "");
247 247 return Handle(THREAD, res);
248 248 }
249 249
250 250 oop MethodHandles::init_field_MemberName(oop mname_oop, Klass* field_holder,
251 251 AccessFlags mods, oop type, oop name,
252 252 intptr_t offset, bool is_setter) {
253 253 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
254 254 flags |= IS_FIELD | ((mods.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
255 255 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
256 256 Metadata* vmtarget = field_holder;
257 257 int vmindex = offset; // determines the field uniquely when combined with static bit
258 258 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
259 259 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
260 260 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
261 261 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror());
262 262 if (name != NULL)
263 263 java_lang_invoke_MemberName::set_name(mname_oop, name);
264 264 if (type != NULL)
265 265 java_lang_invoke_MemberName::set_type(mname_oop, type);
266 266 // Note: name and type can be lazily computed by resolve_MemberName,
267 267 // if Java code needs them as resolved String and Class objects.
268 268 // Note that the incoming type oop might be pre-resolved (non-null).
269 269 // The base clazz and field offset (vmindex) must be eagerly stored,
270 270 // because they unambiguously identify the field.
271 271 // Although the fieldDescriptor::_index would also identify the field,
272 272 // we do not use it, because it is harder to decode.
273 273 // TO DO: maybe intern mname_oop
274 274 return mname_oop;
275 275 }
276 276
277 277 Handle MethodHandles::init_field_MemberName(oop mname_oop, FieldAccessInfo& info, TRAPS) {
278 278 return Handle();
279 279 #if 0 // FIXME
280 280 KlassHandle field_holder = info.klass();
281 281 intptr_t field_offset = info.field_offset();
282 282 return init_field_MemberName(mname_oop, field_holder(),
283 283 info.access_flags(),
284 284 type, name,
285 285 field_offset, false /*is_setter*/);
286 286 #endif
287 287 }
288 288
289 289
290 290 // JVM 2.9 Special Methods:
291 291 // A method is signature polymorphic if and only if all of the following conditions hold :
292 292 // * It is declared in the java.lang.invoke.MethodHandle class.
293 293 // * It has a single formal parameter of type Object[].
294 294 // * It has a return type of Object.
295 295 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
296 296 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
297 297 if (klass == NULL)
298 298 return false;
299 299 // The following test will fail spuriously during bootstrap of MethodHandle itself:
300 300 // if (klass != SystemDictionary::MethodHandle_klass())
301 301 // Test the name instead:
302 302 if (Klass::cast(klass)->name() != vmSymbols::java_lang_invoke_MethodHandle())
303 303 return false;
304 304 Symbol* poly_sig = vmSymbols::object_array_object_signature();
305 305 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
306 306 if (m == NULL) return false;
307 307 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
308 308 int flags = m->access_flags().as_int();
309 309 return (flags & required) == required;
310 310 }
311 311
312 312
313 313 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
314 314 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
315 315 switch (iid) {
316 316 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
317 317 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
318 318 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
319 319 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
320 320 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
321 321 }
322 322 assert(false, "");
323 323 return 0;
324 324 }
325 325
326 326 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
327 327 switch (iid) {
328 328 case vmIntrinsics::_invokeBasic: return 0;
329 329 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
330 330 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
331 331 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
332 332 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
333 333 }
334 334 assert(false, err_msg("iid=%d", iid));
335 335 return 0;
336 336 }
337 337
338 338 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
339 339 vmSymbols::SID name_id = vmSymbols::find_sid(name);
340 340 switch (name_id) {
341 341 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
342 342 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
343 343 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
344 344 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
345 345
346 346 // There is one static signature-polymorphic method for each JVM invocation mode.
347 347 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
348 348 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
349 349 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
350 350 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
351 351 }
352 352
353 353 // Cover the case of invokeExact and any future variants of invokeFoo.
354 354 Klass* mh_klass = SystemDictionary::well_known_klass(
355 355 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
356 356 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
357 357 return vmIntrinsics::_invokeGeneric;
358 358
359 359 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
360 360 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
361 361 return vmIntrinsics::_none;
362 362 }
363 363
364 364 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
365 365 if (klass != NULL &&
366 366 Klass::cast(klass)->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
367 367 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
368 368 if (iid != vmIntrinsics::_none)
369 369 return iid;
370 370 if (is_method_handle_invoke_name(klass, name))
371 371 return vmIntrinsics::_invokeGeneric;
372 372 }
373 373 return vmIntrinsics::_none;
374 374 }
375 375
376 376
377 377 // convert the external string or reflective type to an internal signature
378 378 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
379 379 if (java_lang_invoke_MethodType::is_instance(type_str)) {
380 380 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
381 381 } else if (java_lang_Class::is_instance(type_str)) {
382 382 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
383 383 } else if (java_lang_String::is_instance(type_str)) {
384 384 if (intern_if_not_found) {
385 385 return java_lang_String::as_symbol(type_str, CHECK_NULL);
386 386 } else {
387 387 return java_lang_String::as_symbol_or_null(type_str);
388 388 }
389 389 } else {
390 390 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
391 391 }
392 392 }
393 393
394 394 static const char OBJ_SIG[] = "Ljava/lang/Object;";
395 395 enum { OBJ_SIG_LEN = 18 };
396 396
397 397 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
398 398 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
399 399 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
400 400 const int len = sig->utf8_length();
401 401 for (int i = 0; i < len; i++) {
402 402 switch (sig->byte_at(i)) {
403 403 case 'L':
404 404 // only java/lang/Object is valid here
405 405 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
406 406 return false;
407 407 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
408 408 continue;
409 409 case '(': case ')': case 'V':
410 410 case 'I': case 'J': case 'F': case 'D':
411 411 continue;
412 412 //case '[':
413 413 //case 'Z': case 'B': case 'C': case 'S':
414 414 default:
415 415 return false;
416 416 }
417 417 }
418 418 return true;
419 419 }
420 420
421 421 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
422 422 Symbol* bsig = NULL;
423 423 if (sig == NULL) {
424 424 return sig;
425 425 } else if (is_basic_type_signature(sig)) {
426 426 sig->increment_refcount();
427 427 return sig; // that was easy
428 428 } else if (sig->byte_at(0) != '(') {
429 429 BasicType bt = char2type(sig->byte_at(0));
430 430 if (is_subword_type(bt)) {
431 431 bsig = vmSymbols::int_signature();
432 432 } else {
433 433 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
434 434 bsig = vmSymbols::object_signature();
435 435 }
436 436 } else {
437 437 ResourceMark rm;
438 438 stringStream buffer(128);
439 439 buffer.put('(');
440 440 int arg_pos = 0, keep_arg_pos = -1;
441 441 if (keep_last_arg)
442 442 keep_arg_pos = ArgumentCount(sig).size() - 1;
443 443 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
444 444 BasicType bt = ss.type();
445 445 size_t this_arg_pos = buffer.size();
446 446 if (ss.at_return_type()) {
447 447 buffer.put(')');
448 448 }
449 449 if (arg_pos == keep_arg_pos) {
450 450 buffer.write((char*) ss.raw_bytes(),
451 451 (int) ss.raw_length());
452 452 } else if (bt == T_OBJECT || bt == T_ARRAY) {
453 453 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
454 454 } else {
455 455 if (is_subword_type(bt))
456 456 bt = T_INT;
457 457 buffer.put(type2char(bt));
458 458 }
459 459 arg_pos++;
460 460 }
461 461 const char* sigstr = buffer.base();
462 462 int siglen = (int) buffer.size();
463 463 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
464 464 }
465 465 assert(is_basic_type_signature(bsig) ||
466 466 // detune assert in case the injected argument is not a basic type:
467 467 keep_last_arg, "");
468 468 return bsig;
469 469 }
470 470
471 471 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
472 472 Symbol* sig,
473 473 bool keep_arrays,
474 474 bool keep_basic_names) {
475 475 st = st ? st : tty;
476 476 int len = sig->utf8_length();
477 477 int array = 0;
478 478 bool prev_type = false;
479 479 for (int i = 0; i < len; i++) {
480 480 char ch = sig->byte_at(i);
481 481 switch (ch) {
482 482 case '(': case ')':
483 483 prev_type = false;
484 484 st->put(ch);
485 485 continue;
486 486 case '[':
487 487 if (!keep_basic_names && keep_arrays)
488 488 st->put(ch);
489 489 array++;
490 490 continue;
491 491 case 'L':
492 492 {
493 493 if (prev_type) st->put(',');
494 494 int start = i+1, slash = start;
495 495 while (++i < len && (ch = sig->byte_at(i)) != ';') {
496 496 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
497 497 }
498 498 if (slash < i) start = slash;
499 499 if (!keep_basic_names) {
500 500 st->put('L');
501 501 } else {
502 502 for (int j = start; j < i; j++)
503 503 st->put(sig->byte_at(j));
504 504 prev_type = true;
505 505 }
506 506 break;
507 507 }
508 508 default:
509 509 {
510 510 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
511 511 ch = '[';
512 512 array = 0;
513 513 }
514 514 if (prev_type) st->put(',');
515 515 const char* n = NULL;
516 516 if (keep_basic_names)
517 517 n = type2name(char2type(ch));
518 518 if (n == NULL) {
519 519 // unknown letter, or we don't want to know its name
520 520 st->put(ch);
521 521 } else {
522 522 st->print(n);
523 523 prev_type = true;
524 524 }
525 525 break;
526 526 }
527 527 }
528 528 // Switch break goes here to take care of array suffix:
529 529 if (prev_type) {
530 530 while (array > 0) {
531 531 st->print("[]");
532 532 --array;
533 533 }
534 534 }
535 535 array = 0;
536 536 }
537 537 }
538 538
539 539
540 540
541 541 static oop object_java_mirror() {
542 542 return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
543 543 }
544 544
545 545 static oop field_name_or_null(Symbol* s) {
546 546 if (s == NULL) return NULL;
547 547 return StringTable::lookup(s);
548 548 }
549 549
550 550 static oop field_signature_type_or_null(Symbol* s) {
551 551 if (s == NULL) return NULL;
552 552 BasicType bt = FieldType::basic_type(s);
553 553 if (is_java_primitive(bt)) {
554 554 assert(s->utf8_length() == 1, "");
555 555 return java_lang_Class::primitive_mirror(bt);
556 556 }
557 557 // Here are some more short cuts for common types.
558 558 // They are optional, since reference types can be resolved lazily.
559 559 if (bt == T_OBJECT) {
560 560 if (s == vmSymbols::object_signature()) {
561 561 return object_java_mirror();
562 562 } else if (s == vmSymbols::class_signature()) {
563 563 return Klass::cast(SystemDictionary::Class_klass())->java_mirror();
564 564 } else if (s == vmSymbols::string_signature()) {
565 565 return Klass::cast(SystemDictionary::String_klass())->java_mirror();
566 566 } else {
567 567 int len = s->utf8_length();
568 568 if (s->byte_at(0) == 'L' && s->byte_at(len-1) == ';') {
569 569 TempNewSymbol cname = SymbolTable::probe((const char*)&s->bytes()[1], len-2);
570 570 if (cname == NULL) return NULL;
571 571 Klass* wkk = SystemDictionary::find_well_known_klass(cname);
572 572 if (wkk == NULL) return NULL;
573 573 return Klass::cast(wkk)->java_mirror();
574 574 }
575 575 }
576 576 }
577 577 return NULL;
578 578 }
579 579
580 580
581 581 // An unresolved member name is a mere symbolic reference.
582 582 // Resolving it plants a vmtarget/vmindex in it,
583 583 // which refers directly to JVM internals.
584 584 Handle MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
585 585 Handle empty;
586 586 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
587 587
588 588 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
589 589 // Already resolved.
590 590 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
591 591 assert(vmindex >= Method::nonvirtual_vtable_index, "");
592 592 return mname;
593 593 }
594 594
595 595 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
596 596 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
597 597 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
598 598 int flags = java_lang_invoke_MemberName::flags(mname());
599 599 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
600 600 if (!ref_kind_is_valid(ref_kind)) {
601 601 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
602 602 }
603 603
604 604 DEBUG_ONLY(int old_vmindex);
605 605 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
606 606
607 607 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
608 608 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
609 609 }
610 610
611 611 instanceKlassHandle defc;
612 612 {
613 613 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
614 614 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
615 615 if (!Klass::cast(defc_klass)->oop_is_instance()) {
616 616 if (!Klass::cast(defc_klass)->oop_is_array()) return empty;
617 617 defc_klass = SystemDictionary::Object_klass();
618 618 }
619 619 defc = instanceKlassHandle(THREAD, defc_klass);
620 620 }
621 621 if (defc.is_null()) {
622 622 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
623 623 }
624 624 defc->link_class(CHECK_(empty)); // possible safepoint
625 625
626 626 // convert the external string name to an internal symbol
627 627 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
628 628 if (name == NULL) return empty; // no such name
629 629 if (name == vmSymbols::class_initializer_name())
630 630 return empty; // illegal name
631 631
632 632 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
633 633 if ((flags & ALL_KINDS) == IS_METHOD &&
634 634 (defc() == SystemDictionary::MethodHandle_klass()) &&
635 635 (ref_kind == JVM_REF_invokeVirtual ||
636 636 ref_kind == JVM_REF_invokeSpecial ||
637 637 // static invocation mode is required for _linkToVirtual, etc.:
638 638 ref_kind == JVM_REF_invokeStatic)) {
639 639 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
640 640 if (iid != vmIntrinsics::_none &&
641 641 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
642 642 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
643 643 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
644 644 mh_invoke_id = iid;
645 645 }
646 646 }
647 647
648 648 // convert the external string or reflective type to an internal signature
649 649 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
650 650 if (type == NULL) return empty; // no such signature exists in the VM
651 651
652 652 // Time to do the lookup.
653 653 switch (flags & ALL_KINDS) {
654 654 case IS_METHOD:
655 655 {
656 656 CallInfo result;
657 657 bool do_dispatch = true; // default, neutral setting
658 658 {
659 659 assert(!HAS_PENDING_EXCEPTION, "");
660 660 if (ref_kind == JVM_REF_invokeStatic) {
661 661 //do_dispatch = false; // no need, since statics are never dispatched
662 662 LinkResolver::resolve_static_call(result,
663 663 defc, name, type, KlassHandle(), false, false, THREAD);
664 664 } else if (ref_kind == JVM_REF_invokeInterface) {
665 665 LinkResolver::resolve_interface_call(result, Handle(), defc,
666 666 defc, name, type, KlassHandle(), false, false, THREAD);
667 667 } else if (mh_invoke_id != vmIntrinsics::_none) {
668 668 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
669 669 LinkResolver::resolve_handle_call(result,
670 670 defc, name, type, KlassHandle(), THREAD);
671 671 } else if (ref_kind == JVM_REF_invokeSpecial) {
672 672 do_dispatch = false; // force non-virtual linkage
673 673 LinkResolver::resolve_special_call(result,
674 674 defc, name, type, KlassHandle(), false, THREAD);
675 675 } else if (ref_kind == JVM_REF_invokeVirtual) {
676 676 LinkResolver::resolve_virtual_call(result, Handle(), defc,
677 677 defc, name, type, KlassHandle(), false, false, THREAD);
678 678 } else {
679 679 assert(false, err_msg("ref_kind=%d", ref_kind));
680 680 }
681 681 if (HAS_PENDING_EXCEPTION) {
682 682 return empty;
683 683 }
684 684 }
685 685 return init_method_MemberName(mname(), result, THREAD);
686 686 }
687 687 case IS_CONSTRUCTOR:
688 688 {
689 689 CallInfo result;
690 690 {
691 691 assert(!HAS_PENDING_EXCEPTION, "");
692 692 if (name == vmSymbols::object_initializer_name()) {
693 693 LinkResolver::resolve_special_call(result,
694 694 defc, name, type, KlassHandle(), false, THREAD);
695 695 } else {
696 696 break; // will throw after end of switch
697 697 }
698 698 if (HAS_PENDING_EXCEPTION) {
699 699 return empty;
700 700 }
701 701 }
702 702 assert(result.is_statically_bound(), "");
703 703 return init_method_MemberName(mname(), result, THREAD);
704 704 }
705 705 case IS_FIELD:
706 706 {
707 707 // This is taken from LinkResolver::resolve_field, sans access checks.
708 708 fieldDescriptor fd; // find_field initializes fd if found
709 709 KlassHandle sel_klass(THREAD, InstanceKlass::cast(defc())->find_field(name, type, &fd));
710 710 // check if field exists; i.e., if a klass containing the field def has been selected
711 711 if (sel_klass.is_null()) return empty; // should not happen
712 712 oop type = field_signature_type_or_null(fd.signature());
713 713 oop name = field_name_or_null(fd.name());
714 714 bool is_setter = (ref_kind_is_valid(ref_kind) && ref_kind_is_setter(ref_kind));
715 715 mname = Handle(THREAD,
716 716 init_field_MemberName(mname(), sel_klass(),
717 717 fd.access_flags(), type, name, fd.offset(), is_setter));
718 718 return mname;
719 719 }
720 720 default:
721 721 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
722 722 }
723 723
724 724 return empty;
725 725 }
726 726
727 727 // Conversely, a member name which is only initialized from JVM internals
728 728 // may have null defc, name, and type fields.
729 729 // Resolving it plants a vmtarget/vmindex in it,
730 730 // which refers directly to JVM internals.
731 731 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
732 732 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
733 733 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
734 734 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
735 735 if (vmtarget == NULL) {
736 736 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
737 737 }
738 738
739 739 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
740 740 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
741 741 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
742 742 int flags = java_lang_invoke_MemberName::flags(mname());
743 743
744 744 if (suppress != 0) {
745 745 if (suppress & _suppress_defc) have_defc = true;
746 746 if (suppress & _suppress_name) have_name = true;
747 747 if (suppress & _suppress_type) have_type = true;
748 748 }
749 749
750 750 if (have_defc && have_name && have_type) return; // nothing needed
751 751
752 752 switch (flags & ALL_KINDS) {
753 753 case IS_METHOD:
754 754 case IS_CONSTRUCTOR:
755 755 {
756 756 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
757 757 methodHandle m(THREAD, (Method*)vmtarget);
758 758 DEBUG_ONLY(vmtarget = NULL); // safety
759 759 if (m.is_null()) break;
760 760 if (!have_defc) {
761 761 Klass* defc = m->method_holder();
762 762 java_lang_invoke_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror());
763 763 }
764 764 if (!have_name) {
765 765 //not java_lang_String::create_from_symbol; let's intern member names
766 766 Handle name = StringTable::intern(m->name(), CHECK);
767 767 java_lang_invoke_MemberName::set_name(mname(), name());
768 768 }
769 769 if (!have_type) {
770 770 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
771 771 java_lang_invoke_MemberName::set_type(mname(), type());
772 772 }
773 773 return;
774 774 }
775 775 case IS_FIELD:
776 776 {
777 777 // This is taken from LinkResolver::resolve_field, sans access checks.
778 778 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
779 779 if (!Klass::cast((Klass*) vmtarget)->oop_is_instance()) break;
780 780 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
781 781 DEBUG_ONLY(vmtarget = NULL); // safety
782 782 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
783 783 fieldDescriptor fd; // find_field initializes fd if found
784 784 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
785 785 break; // cannot expand
786 786 if (!have_defc) {
787 787 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
788 788 }
789 789 if (!have_name) {
790 790 //not java_lang_String::create_from_symbol; let's intern member names
791 791 Handle name = StringTable::intern(fd.name(), CHECK);
792 792 java_lang_invoke_MemberName::set_name(mname(), name());
793 793 }
794 794 if (!have_type) {
795 795 // If it is a primitive field type, don't mess with short strings like "I".
796 796 Handle type = field_signature_type_or_null(fd.signature());
797 797 if (type.is_null()) {
798 798 java_lang_String::create_from_symbol(fd.signature(), CHECK);
799 799 }
800 800 java_lang_invoke_MemberName::set_type(mname(), type());
801 801 }
802 802 return;
803 803 }
804 804 }
805 805 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
806 806 }
807 807
808 808 int MethodHandles::find_MemberNames(Klass* k,
809 809 Symbol* name, Symbol* sig,
810 810 int mflags, Klass* caller,
811 811 int skip, objArrayOop results) {
812 812 DEBUG_ONLY(No_Safepoint_Verifier nsv);
813 813 // this code contains no safepoints!
814 814
815 815 // %%% take caller into account!
816 816
817 817 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1;
818 818
819 819 int rfill = 0, rlimit = results->length(), rskip = skip;
820 820 // overflow measurement:
821 821 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
822 822
823 823 int match_flags = mflags;
824 824 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
825 825 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
826 826 bool local_only = !(search_superc | search_intfc);
827 827 bool classes_only = false;
828 828
829 829 if (name != NULL) {
830 830 if (name->utf8_length() == 0) return 0; // a match is not possible
831 831 }
832 832 if (sig != NULL) {
833 833 if (sig->utf8_length() == 0) return 0; // a match is not possible
834 834 if (sig->byte_at(0) == '(')
835 835 match_flags &= ~(IS_FIELD | IS_TYPE);
836 836 else
837 837 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
838 838 }
839 839
840 840 if ((match_flags & IS_TYPE) != 0) {
841 841 // NYI, and Core Reflection works quite well for this query
842 842 }
843 843
844 844 if ((match_flags & IS_FIELD) != 0) {
845 845 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
846 846 if (name != NULL && st.name() != name)
847 847 continue;
848 848 if (sig != NULL && st.signature() != sig)
849 849 continue;
850 850 // passed the filters
851 851 if (rskip > 0) {
852 852 --rskip;
853 853 } else if (rfill < rlimit) {
854 854 oop result = results->obj_at(rfill++);
855 855 if (!java_lang_invoke_MemberName::is_instance(result))
856 856 return -99; // caller bug!
857 857 oop type = field_signature_type_or_null(st.signature());
858 858 oop name = field_name_or_null(st.name());
859 859 oop saved = MethodHandles::init_field_MemberName(result, st.klass()(),
860 860 st.access_flags(), type, name,
861 861 st.offset());
862 862 if (saved != result)
863 863 results->obj_at_put(rfill-1, saved); // show saved instance to user
864 864 } else if (++overflow >= overflow_limit) {
865 865 match_flags = 0; break; // got tired of looking at overflow
866 866 }
867 867 }
868 868 }
869 869
870 870 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
871 871 // watch out for these guys:
872 872 Symbol* init_name = vmSymbols::object_initializer_name();
873 873 Symbol* clinit_name = vmSymbols::class_initializer_name();
874 874 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
875 875 bool negate_name_test = false;
876 876 // fix name so that it captures the intention of IS_CONSTRUCTOR
877 877 if (!(match_flags & IS_METHOD)) {
878 878 // constructors only
879 879 if (name == NULL) {
880 880 name = init_name;
881 881 } else if (name != init_name) {
882 882 return 0; // no constructors of this method name
883 883 }
884 884 } else if (!(match_flags & IS_CONSTRUCTOR)) {
885 885 // methods only
886 886 if (name == NULL) {
887 887 name = init_name;
888 888 negate_name_test = true; // if we see the name, we *omit* the entry
889 889 } else if (name == init_name) {
890 890 return 0; // no methods of this constructor name
891 891 }
892 892 } else {
893 893 // caller will accept either sort; no need to adjust name
894 894 }
895 895 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
896 896 Method* m = st.method();
897 897 Symbol* m_name = m->name();
898 898 if (m_name == clinit_name)
899 899 continue;
900 900 if (name != NULL && ((m_name != name) ^ negate_name_test))
901 901 continue;
902 902 if (sig != NULL && m->signature() != sig)
903 903 continue;
904 904 // passed the filters
905 905 if (rskip > 0) {
906 906 --rskip;
907 907 } else if (rfill < rlimit) {
908 908 oop result = results->obj_at(rfill++);
909 909 if (!java_lang_invoke_MemberName::is_instance(result))
910 910 return -99; // caller bug!
911 911 oop saved = MethodHandles::init_method_MemberName(result, m, true, NULL);
912 912 if (saved != result)
913 913 results->obj_at_put(rfill-1, saved); // show saved instance to user
914 914 } else if (++overflow >= overflow_limit) {
915 915 match_flags = 0; break; // got tired of looking at overflow
916 916 }
917 917 }
918 918 }
919 919
920 920 // return number of elements we at leasted wanted to initialize
921 921 return rfill + overflow;
922 922 }
923 923 //
924 924 // Here are the native methods in java.lang.invoke.MethodHandleNatives
925 925 // They are the private interface between this JVM and the HotSpot-specific
926 926 // Java code that implements JSR 292 method handles.
927 927 //
928 928 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
929 929 // that intrinsic (non-JNI) native methods are defined in HotSpot.
930 930 //
931 931
932 932 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
933 933 switch (which) {
934 934 case MethodHandles::GC_COUNT_GWT:
935 935 #ifdef COMPILER2
936 936 return true;
937 937 #else
938 938 return false;
939 939 #endif
940 940 }
941 941 return 0;
942 942 }
943 943 JVM_END
944 944
945 945 #ifndef PRODUCT
946 946 #define EACH_NAMED_CON(template, requirement) \
947 947 template(MethodHandles,GC_COUNT_GWT) \
948 948 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
949 949 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
950 950 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
951 951 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
952 952 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
953 953 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
954 954 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
955 955 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
956 956 template(MethodHandles,GC_LAMBDA_SUPPORT) \
957 957 /*end*/
958 958
959 959 #define IGNORE_REQ(req_expr) /* req_expr */
960 960 #define ONE_PLUS(scope,value) 1+
961 961 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
962 962 #define VALUE_COMMA(scope,value) scope::value,
963 963 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
964 964 #define STRING_NULL(scope,value) #value "\0"
965 965 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
966 966
967 967 static bool advertise_con_value(int which) {
968 968 if (which < 0) return false;
969 969 bool ok = true;
970 970 int count = 0;
971 971 #define INC_COUNT(scope,value) \
972 972 ++count;
973 973 #define CHECK_REQ(req_expr) \
974 974 if (which < count) return ok; \
975 975 ok = (req_expr);
976 976 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
977 977 #undef INC_COUNT
978 978 #undef CHECK_REQ
979 979 assert(count == con_value_count, "");
980 980 if (which < count) return ok;
981 981 return false;
982 982 }
983 983
984 984 #undef ONE_PLUS
985 985 #undef VALUE_COMMA
986 986 #undef STRING_NULL
987 987 #undef EACH_NAMED_CON
988 988 #endif // PRODUCT
989 989
990 990 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
991 991 #ifndef PRODUCT
992 992 if (advertise_con_value(which)) {
993 993 assert(which >= 0 && which < con_value_count, "");
994 994 int con = con_values[which];
995 995 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
996 996 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
997 997 const char* str = &con_names[0];
998 998 for (int i = 0; i < which; i++)
999 999 str += strlen(str) + 1; // skip name and null
1000 1000 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1001 1001 box->obj_at_put(0, name);
1002 1002 }
1003 1003 return con;
1004 1004 }
1005 1005 #endif
1006 1006 return 0;
1007 1007 }
1008 1008 JVM_END
1009 1009
1010 1010 // void init(MemberName self, AccessibleObject ref)
1011 1011 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1012 1012 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1013 1013 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1014 1014 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1015 1015 oop target_oop = JNIHandles::resolve_non_null(target_jh);
1016 1016 MethodHandles::init_MemberName(mname(), target_oop);
1017 1017 }
1018 1018 JVM_END
1019 1019
1020 1020 // void expand(MemberName self)
1021 1021 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1022 1022 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1023 1023 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1024 1024 MethodHandles::expand_MemberName(mname, 0, CHECK);
1025 1025 }
1026 1026 JVM_END
1027 1027
1028 1028 // void resolve(MemberName self, Class<?> caller)
1029 1029 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1030 1030 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1031 1031 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1032 1032
1033 1033 // The trusted Java code that calls this method should already have performed
1034 1034 // access checks on behalf of the given caller. But, we can verify this.
1035 1035 if (VerifyMethodHandles && caller_jh != NULL &&
1036 1036 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1037 1037 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1038 1038 if (reference_klass != NULL) {
1039 1039 // Emulate LinkResolver::check_klass_accessability.
1040 1040 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1041 1041 if (!Reflection::verify_class_access(caller,
1042 1042 reference_klass,
1043 1043 true)) {
1044 1044 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name());
1045 1045 }
1046 1046 }
1047 1047 }
1048 1048
1049 1049 Handle resolved = MethodHandles::resolve_MemberName(mname, CHECK_NULL);
1050 1050 if (resolved.is_null()) {
1051 1051 int flags = java_lang_invoke_MemberName::flags(mname());
1052 1052 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1053 1053 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1054 1054 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1055 1055 }
1056 1056 if ((flags & ALL_KINDS) == IS_FIELD) {
1057 1057 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1058 1058 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1059 1059 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1060 1060 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1061 1061 } else {
1062 1062 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1063 1063 }
1064 1064 }
1065 1065
1066 1066 return JNIHandles::make_local(THREAD, resolved());
1067 1067 }
1068 1068 JVM_END
1069 1069
1070 1070 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1071 1071 if (mname == NULL ||
1072 1072 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1073 1073 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1074 1074 } else {
1075 1075 int flags = java_lang_invoke_MemberName::flags(mname);
1076 1076 if ((flags & IS_FIELD) != 0 &&
1077 1077 (must_be_static
1078 1078 ? (flags & JVM_ACC_STATIC) != 0
1079 1079 : (flags & JVM_ACC_STATIC) == 0)) {
1080 1080 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1081 1081 return (jlong) vmindex;
1082 1082 }
1083 1083 }
1084 1084 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1085 1085 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1086 1086 return 0;
1087 1087 }
1088 1088
1089 1089 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1090 1090 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1091 1091 }
1092 1092 JVM_END
1093 1093
1094 1094 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1095 1095 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1096 1096 }
1097 1097 JVM_END
1098 1098
1099 1099 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1100 1100 // use the other function to perform sanity checks:
1101 1101 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1102 1102 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1103 1103 return JNIHandles::make_local(THREAD, clazz);
1104 1104 }
1105 1105 JVM_END
1106 1106
1107 1107 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1108 1108 if (mname_jh == NULL) return NULL;
1109 1109 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1110 1110 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1111 1111 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1112 1112 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1113 1113 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1114 1114 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1115 1115 result->obj_at_put(0, x);
1116 1116 x = NULL;
1117 1117 if (vmtarget == NULL) {
1118 1118 x = NULL;
1119 1119 } else if (vmtarget->is_klass()) {
1120 1120 x = Klass::cast((Klass*) vmtarget)->java_mirror();
1121 1121 } else if (vmtarget->is_method()) {
1122 1122 Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL);
1123 1123 x = MethodHandles::init_method_MemberName(mname2(), (Method*)vmtarget, false, NULL);
1124 1124 }
1125 1125 result->obj_at_put(1, x);
1126 1126 return JNIHandles::make_local(env, result());
1127 1127 }
1128 1128 JVM_END
1129 1129
1130 1130
1131 1131
1132 1132 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1133 1133 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1134 1134 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1135 1135 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1136 1136 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1137 1137 if (clazz_jh == NULL || results_jh == NULL) return -1;
1138 1138 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1139 1139
1140 1140 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1141 1141 if (results.is_null() || !results->is_objArray()) return -1;
1142 1142
1143 1143 TempNewSymbol name = NULL;
1144 1144 TempNewSymbol sig = NULL;
1145 1145 if (name_jh != NULL) {
1146 1146 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1147 1147 if (name == NULL) return 0; // a match is not possible
1148 1148 }
1149 1149 if (sig_jh != NULL) {
1150 1150 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1151 1151 if (sig == NULL) return 0; // a match is not possible
1152 1152 }
1153 1153
1154 1154 KlassHandle caller;
1155 1155 if (caller_jh != NULL) {
1156 1156 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1157 1157 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1158 1158 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1159 1159 }
1160 1160
1161 1161 if (name != NULL && sig != NULL && results.not_null()) {
1162 1162 // try a direct resolve
1163 1163 // %%% TO DO
1164 1164 }
1165 1165
1166 1166 int res = MethodHandles::find_MemberNames(k(), name, sig, mflags,
1167 1167 caller(), skip, results());
1168 1168 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1169 1169 return res;
1170 1170 }
1171 1171 JVM_END
1172 1172
1173 1173 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1174 1174 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1175 1175 Handle target (THREAD, JNIHandles::resolve(target_jh));
1176 1176 {
1177 1177 // Walk all nmethods depending on this call site.
1178 1178 MutexLocker mu(Compile_lock, thread);
1179 1179 Universe::flush_dependents_on(call_site, target);
1180 1180 }
1181 1181 java_lang_invoke_CallSite::set_target(call_site(), target());
1182 1182 }
1183 1183 JVM_END
1184 1184
1185 1185 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1186 1186 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
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1187 1187 Handle target (THREAD, JNIHandles::resolve(target_jh));
1188 1188 {
1189 1189 // Walk all nmethods depending on this call site.
1190 1190 MutexLocker mu(Compile_lock, thread);
1191 1191 Universe::flush_dependents_on(call_site, target);
1192 1192 }
1193 1193 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1194 1194 }
1195 1195 JVM_END
1196 1196
1197 -JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) {
1198 - TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL);
1199 - THROW_MSG_NULL(UOE_name, "MethodHandle.invoke cannot be invoked reflectively");
1200 - return NULL;
1201 -}
1202 -JVM_END
1203 -
1204 -JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) {
1205 - TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL);
1206 - THROW_MSG_NULL(UOE_name, "MethodHandle.invokeExact cannot be invoked reflectively");
1207 - return NULL;
1208 -}
1209 -JVM_END
1210 -
1211 1197 /// JVM_RegisterMethodHandleMethods
1212 1198
1213 1199 #undef CS // Solaris builds complain
1214 1200
1215 1201 #define LANG "Ljava/lang/"
1216 1202 #define JLINV "Ljava/lang/invoke/"
1217 1203
1218 1204 #define OBJ LANG"Object;"
1219 1205 #define CLS LANG"Class;"
1220 1206 #define STRG LANG"String;"
1221 1207 #define CS JLINV"CallSite;"
1222 1208 #define MT JLINV"MethodType;"
1223 1209 #define MH JLINV"MethodHandle;"
1224 1210 #define MEM JLINV"MemberName;"
1225 1211
1226 1212 #define CC (char*) /*cast a literal from (const char*)*/
1227 1213 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1228 1214
1229 1215 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1230 1216 static JNINativeMethod required_methods_JDK8[] = {
1231 1217 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1232 1218 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1233 1219 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1234 1220 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1235 1221 // static native int getNamedCon(int which, Object[] name)
1236 1222 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1237 1223 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
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1238 1224 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1239 1225 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1240 1226 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1241 1227 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1242 1228 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1243 1229 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1244 1230 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1245 1231 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1246 1232 };
1247 1233
1248 -static JNINativeMethod invoke_methods[] = {
1249 - {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1250 - {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1251 -};
1252 -
1253 1234 // This one function is exported, used by NativeLookup.
1254 1235
1255 1236 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1256 1237 if (!EnableInvokeDynamic) {
1257 1238 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
1258 1239 return; // bind nothing
1259 1240 }
1260 1241
1261 1242 assert(!MethodHandles::enabled(), "must not be enabled");
1262 1243 bool enable_MH = true;
1263 1244
1264 1245 jclass MH_class = NULL;
1265 1246 if (SystemDictionary::MethodHandle_klass() == NULL) {
1266 1247 enable_MH = false;
1267 1248 } else {
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1268 1249 oop mirror = Klass::cast(SystemDictionary::MethodHandle_klass())->java_mirror();
1269 1250 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1270 1251 }
1271 1252
1272 1253 int status;
1273 1254
1274 1255 if (enable_MH) {
1275 1256 ThreadToNativeFromVM ttnfv(thread);
1276 1257
1277 1258 status = env->RegisterNatives(MHN_class, required_methods_JDK8, sizeof(required_methods_JDK8)/sizeof(JNINativeMethod));
1278 - if (status == JNI_OK && !env->ExceptionOccurred()) {
1279 - status = env->RegisterNatives(MH_class, invoke_methods, sizeof(invoke_methods)/sizeof(JNINativeMethod));
1280 - }
1281 1259 if (status != JNI_OK || env->ExceptionOccurred()) {
1282 1260 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1283 1261 enable_MH = false;
1284 1262 env->ExceptionClear();
1285 1263 }
1286 1264 }
1287 1265
1288 1266 if (TraceInvokeDynamic) {
1289 1267 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1290 1268 }
1291 1269
1292 1270 if (enable_MH) {
1293 1271 MethodHandles::generate_adapters();
1294 1272 MethodHandles::set_enabled(true);
1295 1273 }
1296 1274 }
1297 1275 JVM_END
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