Fri, 16 Aug 2013 13:22:32 +0200
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
Summary: Replace the broken large pages implementation on Linux. New flag: -XX:+UseTransparentHugePages - Linux specific flag to turn on transparent huge page hinting with madvise(..., MAP_HUGETLB). Changed behavior: -XX:+UseLargePages - tries to use -XX:+UseTransparentHugePages before trying other large pages implementations (on Linux). Changed behavior: -XX:+UseHugeTLBFS - Use upfront allocation of Large Pages instead of using the broken implementation to dynamically committing large pages. Changed behavior: -XX:LargePageSizeInBytes - Turned off the ability to use this flag on Linux and provides warning to user if set to a value different than the OS chosen large page size. Changed behavior: Setting no large page size - Now defaults to use -XX:UseTransparentHugePages if the OS supports it. Previously, -XX:+UseHugeTLBFS was chosen if the OS was configured to use large pages.
Reviewed-by: tschatzl, dcubed, brutisso
1 /*
2 * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "compiler/compileBroker.hpp"
28 #include "interpreter/interpreter.hpp"
29 #include "interpreter/oopMapCache.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "prims/jvmtiRedefineClassesTrace.hpp"
33 #include "prims/methodHandles.hpp"
34 #include "runtime/compilationPolicy.hpp"
35 #include "runtime/javaCalls.hpp"
36 #include "runtime/reflection.hpp"
37 #include "runtime/signature.hpp"
38 #include "runtime/stubRoutines.hpp"
41 /*
42 * JSR 292 reference implementation: method handles
43 * The JDK 7 reference implementation represented method handle
44 * combinations as chains. Each link in the chain had a "vmentry"
45 * field which pointed at a bit of assembly code which performed
46 * one transformation before dispatching to the next link in the chain.
47 *
48 * The current reference implementation pushes almost all code generation
49 * responsibility to (trusted) Java code. A method handle contains a
50 * pointer to its "LambdaForm", which embodies all details of the method
51 * handle's behavior. The LambdaForm is a normal Java object, managed
52 * by a runtime coded in Java.
53 */
55 bool MethodHandles::_enabled = false; // set true after successful native linkage
56 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
58 //------------------------------------------------------------------------------
59 // MethodHandles::generate_adapters
60 //
61 void MethodHandles::generate_adapters() {
62 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
64 assert(_adapter_code == NULL, "generate only once");
66 ResourceMark rm;
67 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
68 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
69 if (_adapter_code == NULL)
70 vm_exit_out_of_memory(adapter_code_size, OOM_MALLOC_ERROR,
71 "CodeCache: no room for MethodHandles adapters");
72 {
73 CodeBuffer code(_adapter_code);
74 MethodHandlesAdapterGenerator g(&code);
75 g.generate();
76 code.log_section_sizes("MethodHandlesAdapterBlob");
77 }
78 }
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 }
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 }
106 // MemberName support
108 // import java_lang_invoke_MemberName.*
109 enum {
110 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
111 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
112 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
113 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
114 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
115 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
116 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
117 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
118 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
119 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
120 };
122 Handle MethodHandles::new_MemberName(TRAPS) {
123 Handle empty;
124 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
125 if (!k->is_initialized()) k->initialize(CHECK_(empty));
126 return Handle(THREAD, k->allocate_instance(THREAD));
127 }
129 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
130 Thread* thread = Thread::current();
131 oop target_oop = target();
132 Klass* target_klass = target_oop->klass();
133 if (target_klass == SystemDictionary::reflect_Field_klass()) {
134 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
135 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
136 int mods = java_lang_reflect_Field::modifiers(target_oop);
137 oop type = java_lang_reflect_Field::type(target_oop);
138 oop name = java_lang_reflect_Field::name(target_oop);
139 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
140 intptr_t offset = InstanceKlass::cast(k())->field_offset(slot);
141 return init_field_MemberName(mname, k, accessFlags_from(mods), type, name, offset);
142 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
143 oop clazz = java_lang_reflect_Method::clazz(target_oop);
144 int slot = java_lang_reflect_Method::slot(target_oop);
145 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
146 if (!k.is_null() && k->oop_is_instance()) {
147 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
148 return init_method_MemberName(mname, m, true, k);
149 }
150 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
151 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
152 int slot = java_lang_reflect_Constructor::slot(target_oop);
153 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
154 if (!k.is_null() && k->oop_is_instance()) {
155 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
156 return init_method_MemberName(mname, m, false, k);
157 }
158 } else if (target_klass == SystemDictionary::MemberName_klass()) {
159 // Note: This only works if the MemberName has already been resolved.
160 oop clazz = java_lang_invoke_MemberName::clazz(target_oop);
161 int flags = java_lang_invoke_MemberName::flags(target_oop);
162 Metadata* vmtarget=java_lang_invoke_MemberName::vmtarget(target_oop);
163 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(target_oop);
164 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
165 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
166 if (vmtarget == NULL) return NULL; // not resolved
167 if ((flags & IS_FIELD) != 0) {
168 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
169 int basic_mods = (ref_kind_is_static(ref_kind) ? JVM_ACC_STATIC : 0);
170 // FIXME: how does k (receiver_limit) contribute?
171 KlassHandle k_vmtarget(thread, (Klass*)vmtarget);
172 return init_field_MemberName(mname, k_vmtarget, accessFlags_from(basic_mods), NULL, NULL, vmindex);
173 } else if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
174 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
175 return init_method_MemberName(mname, (Method*)vmtarget, ref_kind_does_dispatch(ref_kind), k);
176 } else {
177 return NULL;
178 }
179 }
180 return NULL;
181 }
183 oop MethodHandles::init_method_MemberName(Handle mname, Method* m, bool do_dispatch,
184 KlassHandle receiver_limit_h) {
185 Klass* receiver_limit = receiver_limit_h();
186 AccessFlags mods = m->access_flags();
187 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
188 int vmindex = Method::nonvirtual_vtable_index; // implies never any dispatch
189 Klass* mklass = m->method_holder();
190 if (receiver_limit == NULL)
191 receiver_limit = mklass;
192 if (m->is_initializer()) {
193 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
194 } else if (mods.is_static()) {
195 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
196 } else if (receiver_limit != mklass &&
197 !receiver_limit->is_subtype_of(mklass)) {
198 return NULL; // bad receiver limit
199 } else if (do_dispatch && receiver_limit->is_interface() &&
200 mklass->is_interface()) {
201 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
202 receiver_limit = mklass; // ignore passed-in limit; interfaces are interconvertible
203 vmindex = klassItable::compute_itable_index(m);
204 } else if (do_dispatch && mklass != receiver_limit && mklass->is_interface()) {
205 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
206 // it is a miranda method, so m->vtable_index is not what we want
207 ResourceMark rm;
208 klassVtable* vt = InstanceKlass::cast(receiver_limit)->vtable();
209 vmindex = vt->index_of_miranda(m->name(), m->signature());
210 } else if (!do_dispatch || m->can_be_statically_bound()) {
211 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
212 } else {
213 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
214 vmindex = m->vtable_index();
215 }
217 // @CallerSensitive annotation detected
218 if (m->caller_sensitive()) {
219 flags |= CALLER_SENSITIVE;
220 }
222 oop mname_oop = mname();
223 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
224 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m);
225 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
226 java_lang_invoke_MemberName::set_clazz( mname_oop, receiver_limit->java_mirror());
227 // Note: name and type can be lazily computed by resolve_MemberName,
228 // if Java code needs them as resolved String and MethodType objects.
229 // The clazz must be eagerly stored, because it provides a GC
230 // root to help keep alive the Method*.
231 // If relevant, the vtable or itable value is stored as vmindex.
232 // This is done eagerly, since it is readily available without
233 // constructing any new objects.
234 // TO DO: maybe intern mname_oop
235 m->method_holder()->add_member_name(m->method_idnum(), mname);
237 return mname();
238 }
240 Handle MethodHandles::init_method_MemberName(Handle mname, CallInfo& info, TRAPS) {
241 Handle empty;
242 if (info.resolved_appendix().not_null()) {
243 // The resolved MemberName must not be accompanied by an appendix argument,
244 // since there is no way to bind this value into the MemberName.
245 // Caller is responsible to prevent this from happening.
246 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
247 }
248 methodHandle m = info.resolved_method();
249 KlassHandle defc = info.resolved_klass();
250 int vmindex = Method::invalid_vtable_index;
251 if (defc->is_interface() && m->method_holder()->is_interface()) {
252 // static interface methods do not reference vtable or itable
253 if (m->is_static()) {
254 vmindex = Method::nonvirtual_vtable_index;
255 }
256 // interface methods invoked via invokespecial also
257 // do not reference vtable or itable.
258 int ref_kind = ((java_lang_invoke_MemberName::flags(mname()) >>
259 REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK);
260 if (ref_kind == JVM_REF_invokeSpecial) {
261 vmindex = Method::nonvirtual_vtable_index;
262 }
263 // If neither m is static nor ref_kind is invokespecial,
264 // set it to itable index.
265 if (vmindex == Method::invalid_vtable_index) {
266 // LinkResolver does not report itable indexes! (fix this?)
267 vmindex = klassItable::compute_itable_index(m());
268 }
269 } else if (m->can_be_statically_bound()) {
270 // LinkResolver reports vtable index even for final methods!
271 vmindex = Method::nonvirtual_vtable_index;
272 } else {
273 vmindex = info.vtable_index();
274 }
275 oop res = init_method_MemberName(mname, m(), (vmindex >= 0), defc());
276 assert(res == NULL || (java_lang_invoke_MemberName::vmindex(res) == vmindex), "");
277 return Handle(THREAD, res);
278 }
280 oop MethodHandles::init_field_MemberName(Handle mname, KlassHandle field_holder,
281 AccessFlags mods, oop type, oop name,
282 intptr_t offset, bool is_setter) {
283 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
284 flags |= IS_FIELD | ((mods.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
285 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
286 Metadata* vmtarget = field_holder();
287 int vmindex = offset; // determines the field uniquely when combined with static bit
288 oop mname_oop = mname();
289 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
290 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
291 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
292 java_lang_invoke_MemberName::set_clazz(mname_oop, field_holder->java_mirror());
293 if (name != NULL)
294 java_lang_invoke_MemberName::set_name(mname_oop, name);
295 if (type != NULL)
296 java_lang_invoke_MemberName::set_type(mname_oop, type);
297 // Note: name and type can be lazily computed by resolve_MemberName,
298 // if Java code needs them as resolved String and Class objects.
299 // Note that the incoming type oop might be pre-resolved (non-null).
300 // The base clazz and field offset (vmindex) must be eagerly stored,
301 // because they unambiguously identify the field.
302 // Although the fieldDescriptor::_index would also identify the field,
303 // we do not use it, because it is harder to decode.
304 // TO DO: maybe intern mname_oop
305 return mname();
306 }
308 Handle MethodHandles::init_field_MemberName(Handle mname, FieldAccessInfo& info, TRAPS) {
309 return Handle();
310 #if 0 // FIXME
311 KlassHandle field_holder = info.klass();
312 intptr_t field_offset = info.field_offset();
313 return init_field_MemberName(mname_oop, field_holder(),
314 info.access_flags(),
315 type, name,
316 field_offset, false /*is_setter*/);
317 #endif
318 }
321 // JVM 2.9 Special Methods:
322 // A method is signature polymorphic if and only if all of the following conditions hold :
323 // * It is declared in the java.lang.invoke.MethodHandle class.
324 // * It has a single formal parameter of type Object[].
325 // * It has a return type of Object.
326 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
327 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
328 if (klass == NULL)
329 return false;
330 // The following test will fail spuriously during bootstrap of MethodHandle itself:
331 // if (klass != SystemDictionary::MethodHandle_klass())
332 // Test the name instead:
333 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
334 return false;
335 Symbol* poly_sig = vmSymbols::object_array_object_signature();
336 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
337 if (m == NULL) return false;
338 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
339 int flags = m->access_flags().as_int();
340 return (flags & required) == required;
341 }
344 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
345 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
346 switch (iid) {
347 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
348 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
349 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
350 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
351 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
352 }
353 assert(false, "");
354 return 0;
355 }
357 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
358 switch (iid) {
359 case vmIntrinsics::_invokeBasic: return 0;
360 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
361 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
362 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
363 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
364 }
365 assert(false, err_msg("iid=%d", iid));
366 return 0;
367 }
369 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
370 vmSymbols::SID name_id = vmSymbols::find_sid(name);
371 switch (name_id) {
372 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
373 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
374 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
375 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
377 // There is one static signature-polymorphic method for each JVM invocation mode.
378 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
379 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
380 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
381 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
382 }
384 // Cover the case of invokeExact and any future variants of invokeFoo.
385 Klass* mh_klass = SystemDictionary::well_known_klass(
386 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
387 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
388 return vmIntrinsics::_invokeGeneric;
390 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
391 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
392 return vmIntrinsics::_none;
393 }
395 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
396 if (klass != NULL &&
397 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
398 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
399 if (iid != vmIntrinsics::_none)
400 return iid;
401 if (is_method_handle_invoke_name(klass, name))
402 return vmIntrinsics::_invokeGeneric;
403 }
404 return vmIntrinsics::_none;
405 }
408 // convert the external string or reflective type to an internal signature
409 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
410 if (java_lang_invoke_MethodType::is_instance(type_str)) {
411 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
412 } else if (java_lang_Class::is_instance(type_str)) {
413 return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
414 } else if (java_lang_String::is_instance(type_str)) {
415 if (intern_if_not_found) {
416 return java_lang_String::as_symbol(type_str, CHECK_NULL);
417 } else {
418 return java_lang_String::as_symbol_or_null(type_str);
419 }
420 } else {
421 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
422 }
423 }
425 static const char OBJ_SIG[] = "Ljava/lang/Object;";
426 enum { OBJ_SIG_LEN = 18 };
428 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
429 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
430 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
431 const int len = sig->utf8_length();
432 for (int i = 0; i < len; i++) {
433 switch (sig->byte_at(i)) {
434 case 'L':
435 // only java/lang/Object is valid here
436 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
437 return false;
438 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
439 continue;
440 case '(': case ')': case 'V':
441 case 'I': case 'J': case 'F': case 'D':
442 continue;
443 //case '[':
444 //case 'Z': case 'B': case 'C': case 'S':
445 default:
446 return false;
447 }
448 }
449 return true;
450 }
452 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
453 Symbol* bsig = NULL;
454 if (sig == NULL) {
455 return sig;
456 } else if (is_basic_type_signature(sig)) {
457 sig->increment_refcount();
458 return sig; // that was easy
459 } else if (sig->byte_at(0) != '(') {
460 BasicType bt = char2type(sig->byte_at(0));
461 if (is_subword_type(bt)) {
462 bsig = vmSymbols::int_signature();
463 } else {
464 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
465 bsig = vmSymbols::object_signature();
466 }
467 } else {
468 ResourceMark rm;
469 stringStream buffer(128);
470 buffer.put('(');
471 int arg_pos = 0, keep_arg_pos = -1;
472 if (keep_last_arg)
473 keep_arg_pos = ArgumentCount(sig).size() - 1;
474 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
475 BasicType bt = ss.type();
476 size_t this_arg_pos = buffer.size();
477 if (ss.at_return_type()) {
478 buffer.put(')');
479 }
480 if (arg_pos == keep_arg_pos) {
481 buffer.write((char*) ss.raw_bytes(),
482 (int) ss.raw_length());
483 } else if (bt == T_OBJECT || bt == T_ARRAY) {
484 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
485 } else {
486 if (is_subword_type(bt))
487 bt = T_INT;
488 buffer.put(type2char(bt));
489 }
490 arg_pos++;
491 }
492 const char* sigstr = buffer.base();
493 int siglen = (int) buffer.size();
494 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
495 }
496 assert(is_basic_type_signature(bsig) ||
497 // detune assert in case the injected argument is not a basic type:
498 keep_last_arg, "");
499 return bsig;
500 }
502 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
503 Symbol* sig,
504 bool keep_arrays,
505 bool keep_basic_names) {
506 st = st ? st : tty;
507 int len = sig->utf8_length();
508 int array = 0;
509 bool prev_type = false;
510 for (int i = 0; i < len; i++) {
511 char ch = sig->byte_at(i);
512 switch (ch) {
513 case '(': case ')':
514 prev_type = false;
515 st->put(ch);
516 continue;
517 case '[':
518 if (!keep_basic_names && keep_arrays)
519 st->put(ch);
520 array++;
521 continue;
522 case 'L':
523 {
524 if (prev_type) st->put(',');
525 int start = i+1, slash = start;
526 while (++i < len && (ch = sig->byte_at(i)) != ';') {
527 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
528 }
529 if (slash < i) start = slash;
530 if (!keep_basic_names) {
531 st->put('L');
532 } else {
533 for (int j = start; j < i; j++)
534 st->put(sig->byte_at(j));
535 prev_type = true;
536 }
537 break;
538 }
539 default:
540 {
541 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
542 ch = '[';
543 array = 0;
544 }
545 if (prev_type) st->put(',');
546 const char* n = NULL;
547 if (keep_basic_names)
548 n = type2name(char2type(ch));
549 if (n == NULL) {
550 // unknown letter, or we don't want to know its name
551 st->put(ch);
552 } else {
553 st->print(n);
554 prev_type = true;
555 }
556 break;
557 }
558 }
559 // Switch break goes here to take care of array suffix:
560 if (prev_type) {
561 while (array > 0) {
562 st->print("[]");
563 --array;
564 }
565 }
566 array = 0;
567 }
568 }
572 static oop object_java_mirror() {
573 return SystemDictionary::Object_klass()->java_mirror();
574 }
576 static oop field_name_or_null(Symbol* s) {
577 if (s == NULL) return NULL;
578 return StringTable::lookup(s);
579 }
581 static oop field_signature_type_or_null(Symbol* s) {
582 if (s == NULL) return NULL;
583 BasicType bt = FieldType::basic_type(s);
584 if (is_java_primitive(bt)) {
585 assert(s->utf8_length() == 1, "");
586 return java_lang_Class::primitive_mirror(bt);
587 }
588 // Here are some more short cuts for common types.
589 // They are optional, since reference types can be resolved lazily.
590 if (bt == T_OBJECT) {
591 if (s == vmSymbols::object_signature()) {
592 return object_java_mirror();
593 } else if (s == vmSymbols::class_signature()) {
594 return SystemDictionary::Class_klass()->java_mirror();
595 } else if (s == vmSymbols::string_signature()) {
596 return SystemDictionary::String_klass()->java_mirror();
597 }
598 }
599 return NULL;
600 }
603 // An unresolved member name is a mere symbolic reference.
604 // Resolving it plants a vmtarget/vmindex in it,
605 // which refers directly to JVM internals.
606 Handle MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
607 Handle empty;
608 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
610 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
611 // Already resolved.
612 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
613 assert(vmindex >= Method::nonvirtual_vtable_index, "");
614 return mname;
615 }
617 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
618 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
619 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
620 int flags = java_lang_invoke_MemberName::flags(mname());
621 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
622 if (!ref_kind_is_valid(ref_kind)) {
623 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
624 }
626 DEBUG_ONLY(int old_vmindex);
627 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
629 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
630 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
631 }
633 instanceKlassHandle defc;
634 {
635 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
636 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
637 if (!defc_klass->oop_is_instance()) {
638 if (!defc_klass->oop_is_array()) return empty;
639 defc_klass = SystemDictionary::Object_klass();
640 }
641 defc = instanceKlassHandle(THREAD, defc_klass);
642 }
643 if (defc.is_null()) {
644 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
645 }
646 defc->link_class(CHECK_(empty)); // possible safepoint
648 // convert the external string name to an internal symbol
649 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
650 if (name == NULL) return empty; // no such name
651 if (name == vmSymbols::class_initializer_name())
652 return empty; // illegal name
654 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
655 if ((flags & ALL_KINDS) == IS_METHOD &&
656 (defc() == SystemDictionary::MethodHandle_klass()) &&
657 (ref_kind == JVM_REF_invokeVirtual ||
658 ref_kind == JVM_REF_invokeSpecial ||
659 // static invocation mode is required for _linkToVirtual, etc.:
660 ref_kind == JVM_REF_invokeStatic)) {
661 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
662 if (iid != vmIntrinsics::_none &&
663 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
664 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
665 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
666 mh_invoke_id = iid;
667 }
668 }
670 // convert the external string or reflective type to an internal signature
671 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
672 if (type == NULL) return empty; // no such signature exists in the VM
674 // Time to do the lookup.
675 switch (flags & ALL_KINDS) {
676 case IS_METHOD:
677 {
678 CallInfo result;
679 {
680 assert(!HAS_PENDING_EXCEPTION, "");
681 if (ref_kind == JVM_REF_invokeStatic) {
682 LinkResolver::resolve_static_call(result,
683 defc, name, type, KlassHandle(), false, false, THREAD);
684 } else if (ref_kind == JVM_REF_invokeInterface) {
685 LinkResolver::resolve_interface_call(result, Handle(), defc,
686 defc, name, type, KlassHandle(), false, false, THREAD);
687 } else if (mh_invoke_id != vmIntrinsics::_none) {
688 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
689 LinkResolver::resolve_handle_call(result,
690 defc, name, type, KlassHandle(), THREAD);
691 } else if (ref_kind == JVM_REF_invokeSpecial) {
692 LinkResolver::resolve_special_call(result,
693 defc, name, type, KlassHandle(), false, THREAD);
694 } else if (ref_kind == JVM_REF_invokeVirtual) {
695 LinkResolver::resolve_virtual_call(result, Handle(), defc,
696 defc, name, type, KlassHandle(), false, false, THREAD);
697 } else {
698 assert(false, err_msg("ref_kind=%d", ref_kind));
699 }
700 if (HAS_PENDING_EXCEPTION) {
701 return empty;
702 }
703 }
704 return init_method_MemberName(mname, result, THREAD);
705 }
706 case IS_CONSTRUCTOR:
707 {
708 CallInfo result;
709 {
710 assert(!HAS_PENDING_EXCEPTION, "");
711 if (name == vmSymbols::object_initializer_name()) {
712 LinkResolver::resolve_special_call(result,
713 defc, name, type, KlassHandle(), false, THREAD);
714 } else {
715 break; // will throw after end of switch
716 }
717 if (HAS_PENDING_EXCEPTION) {
718 return empty;
719 }
720 }
721 assert(result.is_statically_bound(), "");
722 return init_method_MemberName(mname, result, THREAD);
723 }
724 case IS_FIELD:
725 {
726 // This is taken from LinkResolver::resolve_field, sans access checks.
727 fieldDescriptor fd; // find_field initializes fd if found
728 KlassHandle sel_klass(THREAD, InstanceKlass::cast(defc())->find_field(name, type, &fd));
729 // check if field exists; i.e., if a klass containing the field def has been selected
730 if (sel_klass.is_null()) return empty; // should not happen
731 oop type = field_signature_type_or_null(fd.signature());
732 oop name = field_name_or_null(fd.name());
733 bool is_setter = (ref_kind_is_valid(ref_kind) && ref_kind_is_setter(ref_kind));
734 mname = Handle(THREAD,
735 init_field_MemberName(mname, sel_klass,
736 fd.access_flags(), type, name, fd.offset(), is_setter));
737 return mname;
738 }
739 default:
740 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
741 }
743 return empty;
744 }
746 // Conversely, a member name which is only initialized from JVM internals
747 // may have null defc, name, and type fields.
748 // Resolving it plants a vmtarget/vmindex in it,
749 // which refers directly to JVM internals.
750 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
751 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
752 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
753 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
754 if (vmtarget == NULL) {
755 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
756 }
758 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
759 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
760 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
761 int flags = java_lang_invoke_MemberName::flags(mname());
763 if (suppress != 0) {
764 if (suppress & _suppress_defc) have_defc = true;
765 if (suppress & _suppress_name) have_name = true;
766 if (suppress & _suppress_type) have_type = true;
767 }
769 if (have_defc && have_name && have_type) return; // nothing needed
771 switch (flags & ALL_KINDS) {
772 case IS_METHOD:
773 case IS_CONSTRUCTOR:
774 {
775 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
776 methodHandle m(THREAD, (Method*)vmtarget);
777 DEBUG_ONLY(vmtarget = NULL); // safety
778 if (m.is_null()) break;
779 if (!have_defc) {
780 InstanceKlass* defc = m->method_holder();
781 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
782 }
783 if (!have_name) {
784 //not java_lang_String::create_from_symbol; let's intern member names
785 Handle name = StringTable::intern(m->name(), CHECK);
786 java_lang_invoke_MemberName::set_name(mname(), name());
787 }
788 if (!have_type) {
789 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
790 java_lang_invoke_MemberName::set_type(mname(), type());
791 }
792 return;
793 }
794 case IS_FIELD:
795 {
796 // This is taken from LinkResolver::resolve_field, sans access checks.
797 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
798 if (!((Klass*) vmtarget)->oop_is_instance()) break;
799 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
800 DEBUG_ONLY(vmtarget = NULL); // safety
801 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
802 fieldDescriptor fd; // find_field initializes fd if found
803 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
804 break; // cannot expand
805 if (!have_defc) {
806 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
807 }
808 if (!have_name) {
809 //not java_lang_String::create_from_symbol; let's intern member names
810 Handle name = StringTable::intern(fd.name(), CHECK);
811 java_lang_invoke_MemberName::set_name(mname(), name());
812 }
813 if (!have_type) {
814 // If it is a primitive field type, don't mess with short strings like "I".
815 Handle type = field_signature_type_or_null(fd.signature());
816 if (type.is_null()) {
817 java_lang_String::create_from_symbol(fd.signature(), CHECK);
818 }
819 java_lang_invoke_MemberName::set_type(mname(), type());
820 }
821 return;
822 }
823 }
824 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
825 }
827 int MethodHandles::find_MemberNames(KlassHandle k,
828 Symbol* name, Symbol* sig,
829 int mflags, KlassHandle caller,
830 int skip, objArrayHandle results) {
831 // %%% take caller into account!
833 Thread* thread = Thread::current();
835 if (k.is_null() || !k->oop_is_instance()) return -1;
837 int rfill = 0, rlimit = results->length(), rskip = skip;
838 // overflow measurement:
839 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
841 int match_flags = mflags;
842 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
843 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
844 bool local_only = !(search_superc | search_intfc);
845 bool classes_only = false;
847 if (name != NULL) {
848 if (name->utf8_length() == 0) return 0; // a match is not possible
849 }
850 if (sig != NULL) {
851 if (sig->utf8_length() == 0) return 0; // a match is not possible
852 if (sig->byte_at(0) == '(')
853 match_flags &= ~(IS_FIELD | IS_TYPE);
854 else
855 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
856 }
858 if ((match_flags & IS_TYPE) != 0) {
859 // NYI, and Core Reflection works quite well for this query
860 }
862 if ((match_flags & IS_FIELD) != 0) {
863 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
864 if (name != NULL && st.name() != name)
865 continue;
866 if (sig != NULL && st.signature() != sig)
867 continue;
868 // passed the filters
869 if (rskip > 0) {
870 --rskip;
871 } else if (rfill < rlimit) {
872 Handle result(thread, results->obj_at(rfill++));
873 if (!java_lang_invoke_MemberName::is_instance(result()))
874 return -99; // caller bug!
875 oop type = field_signature_type_or_null(st.signature());
876 oop name = field_name_or_null(st.name());
877 oop saved = MethodHandles::init_field_MemberName(result, st.klass(),
878 st.access_flags(), type, name,
879 st.offset());
880 if (saved != result())
881 results->obj_at_put(rfill-1, saved); // show saved instance to user
882 } else if (++overflow >= overflow_limit) {
883 match_flags = 0; break; // got tired of looking at overflow
884 }
885 }
886 }
888 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
889 // watch out for these guys:
890 Symbol* init_name = vmSymbols::object_initializer_name();
891 Symbol* clinit_name = vmSymbols::class_initializer_name();
892 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
893 bool negate_name_test = false;
894 // fix name so that it captures the intention of IS_CONSTRUCTOR
895 if (!(match_flags & IS_METHOD)) {
896 // constructors only
897 if (name == NULL) {
898 name = init_name;
899 } else if (name != init_name) {
900 return 0; // no constructors of this method name
901 }
902 } else if (!(match_flags & IS_CONSTRUCTOR)) {
903 // methods only
904 if (name == NULL) {
905 name = init_name;
906 negate_name_test = true; // if we see the name, we *omit* the entry
907 } else if (name == init_name) {
908 return 0; // no methods of this constructor name
909 }
910 } else {
911 // caller will accept either sort; no need to adjust name
912 }
913 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
914 Method* m = st.method();
915 Symbol* m_name = m->name();
916 if (m_name == clinit_name)
917 continue;
918 if (name != NULL && ((m_name != name) ^ negate_name_test))
919 continue;
920 if (sig != NULL && m->signature() != sig)
921 continue;
922 // passed the filters
923 if (rskip > 0) {
924 --rskip;
925 } else if (rfill < rlimit) {
926 Handle result(thread, results->obj_at(rfill++));
927 if (!java_lang_invoke_MemberName::is_instance(result()))
928 return -99; // caller bug!
929 oop saved = MethodHandles::init_method_MemberName(result, m, true, NULL);
930 if (saved != result())
931 results->obj_at_put(rfill-1, saved); // show saved instance to user
932 } else if (++overflow >= overflow_limit) {
933 match_flags = 0; break; // got tired of looking at overflow
934 }
935 }
936 }
938 // return number of elements we at leasted wanted to initialize
939 return rfill + overflow;
940 }
942 //------------------------------------------------------------------------------
943 // MemberNameTable
944 //
946 MemberNameTable::MemberNameTable(int methods_cnt)
947 : GrowableArray<jweak>(methods_cnt, true) {
948 assert_locked_or_safepoint(MemberNameTable_lock);
949 }
951 MemberNameTable::~MemberNameTable() {
952 assert_locked_or_safepoint(MemberNameTable_lock);
953 int len = this->length();
955 for (int idx = 0; idx < len; idx++) {
956 jweak ref = this->at(idx);
957 JNIHandles::destroy_weak_global(ref);
958 }
959 }
961 void MemberNameTable::add_member_name(int index, jweak mem_name_wref) {
962 assert_locked_or_safepoint(MemberNameTable_lock);
963 this->at_put_grow(index, mem_name_wref);
964 }
966 // Return a member name oop or NULL.
967 oop MemberNameTable::get_member_name(int index) {
968 assert_locked_or_safepoint(MemberNameTable_lock);
970 jweak ref = this->at(index);
971 oop mem_name = JNIHandles::resolve(ref);
972 return mem_name;
973 }
975 #if INCLUDE_JVMTI
976 oop MemberNameTable::find_member_name_by_method(Method* old_method) {
977 assert_locked_or_safepoint(MemberNameTable_lock);
978 oop found = NULL;
979 int len = this->length();
981 for (int idx = 0; idx < len; idx++) {
982 oop mem_name = JNIHandles::resolve(this->at(idx));
983 if (mem_name == NULL) {
984 continue;
985 }
986 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
987 if (method == old_method) {
988 found = mem_name;
989 break;
990 }
991 }
992 return found;
993 }
995 // It is called at safepoint only
996 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
997 int methods_length, bool *trace_name_printed) {
998 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
999 // search the MemberNameTable for uses of either obsolete or EMCP methods
1000 for (int j = 0; j < methods_length; j++) {
1001 Method* old_method = old_methods[j];
1002 Method* new_method = new_methods[j];
1003 oop mem_name = find_member_name_by_method(old_method);
1004 if (mem_name != NULL) {
1005 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method);
1007 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1008 if (!(*trace_name_printed)) {
1009 // RC_TRACE_MESG macro has an embedded ResourceMark
1010 RC_TRACE_MESG(("adjust: name=%s",
1011 old_method->method_holder()->external_name()));
1012 *trace_name_printed = true;
1013 }
1014 // RC_TRACE macro has an embedded ResourceMark
1015 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
1016 new_method->name()->as_C_string(),
1017 new_method->signature()->as_C_string()));
1018 }
1019 }
1020 }
1021 }
1022 #endif // INCLUDE_JVMTI
1024 //
1025 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1026 // They are the private interface between this JVM and the HotSpot-specific
1027 // Java code that implements JSR 292 method handles.
1028 //
1029 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1030 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1031 //
1033 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
1034 switch (which) {
1035 case MethodHandles::GC_COUNT_GWT:
1036 #ifdef COMPILER2
1037 return true;
1038 #else
1039 return false;
1040 #endif
1041 }
1042 return 0;
1043 }
1044 JVM_END
1046 #ifndef PRODUCT
1047 #define EACH_NAMED_CON(template, requirement) \
1048 template(MethodHandles,GC_COUNT_GWT) \
1049 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1050 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1051 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1052 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1053 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
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*/
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) };
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 }
1086 #undef ONE_PLUS
1087 #undef VALUE_COMMA
1088 #undef STRING_NULL
1089 #undef EACH_NAMED_CON
1090 #endif // PRODUCT
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
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
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
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));
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 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1140 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1141 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1142 }
1144 // Reflection::verify_class_access can only handle instance classes.
1145 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1146 // Emulate LinkResolver::check_klass_accessability.
1147 Klass* caller = java_lang_Class::as_Klass(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(), reference_klass->external_name());
1152 }
1153 }
1154 }
1156 Handle resolved = MethodHandles::resolve_MemberName(mname, CHECK_NULL);
1157 if (resolved.is_null()) {
1158 int flags = java_lang_invoke_MemberName::flags(mname());
1159 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1160 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1161 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1162 }
1163 if ((flags & ALL_KINDS) == IS_FIELD) {
1164 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1165 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1166 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1167 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1168 } else {
1169 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1170 }
1171 }
1173 return JNIHandles::make_local(THREAD, resolved());
1174 }
1175 JVM_END
1177 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1178 if (mname == NULL ||
1179 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1180 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1181 } else {
1182 int flags = java_lang_invoke_MemberName::flags(mname);
1183 if ((flags & IS_FIELD) != 0 &&
1184 (must_be_static
1185 ? (flags & JVM_ACC_STATIC) != 0
1186 : (flags & JVM_ACC_STATIC) == 0)) {
1187 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1188 return (jlong) vmindex;
1189 }
1190 }
1191 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1192 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1193 return 0;
1194 }
1196 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1197 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1198 }
1199 JVM_END
1201 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1202 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1203 }
1204 JVM_END
1206 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1207 // use the other function to perform sanity checks:
1208 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1209 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1210 return JNIHandles::make_local(THREAD, clazz);
1211 }
1212 JVM_END
1214 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1215 if (mname_jh == NULL) return NULL;
1216 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1217 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1218 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1219 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1220 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1221 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1222 result->obj_at_put(0, x);
1223 x = NULL;
1224 if (vmtarget == NULL) {
1225 x = NULL;
1226 } else if (vmtarget->is_klass()) {
1227 x = ((Klass*) vmtarget)->java_mirror();
1228 } else if (vmtarget->is_method()) {
1229 Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL);
1230 x = MethodHandles::init_method_MemberName(mname2, (Method*)vmtarget, false, NULL);
1231 }
1232 result->obj_at_put(1, x);
1233 return JNIHandles::make_local(env, result());
1234 }
1235 JVM_END
1239 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1240 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1241 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1242 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1243 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1244 if (clazz_jh == NULL || results_jh == NULL) return -1;
1245 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1247 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1248 if (results.is_null() || !results->is_objArray()) return -1;
1250 TempNewSymbol name = NULL;
1251 TempNewSymbol sig = NULL;
1252 if (name_jh != NULL) {
1253 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1254 if (name == NULL) return 0; // a match is not possible
1255 }
1256 if (sig_jh != NULL) {
1257 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1258 if (sig == NULL) return 0; // a match is not possible
1259 }
1261 KlassHandle caller;
1262 if (caller_jh != NULL) {
1263 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1264 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1265 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1266 }
1268 if (name != NULL && sig != NULL && results.not_null()) {
1269 // try a direct resolve
1270 // %%% TO DO
1271 }
1273 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1274 caller, skip, results);
1275 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1276 return res;
1277 }
1278 JVM_END
1280 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1281 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1282 Handle target (THREAD, JNIHandles::resolve(target_jh));
1283 {
1284 // Walk all nmethods depending on this call site.
1285 MutexLocker mu(Compile_lock, thread);
1286 Universe::flush_dependents_on(call_site, target);
1287 java_lang_invoke_CallSite::set_target(call_site(), target());
1288 }
1289 }
1290 JVM_END
1292 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1293 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1294 Handle target (THREAD, JNIHandles::resolve(target_jh));
1295 {
1296 // Walk all nmethods depending on this call site.
1297 MutexLocker mu(Compile_lock, thread);
1298 Universe::flush_dependents_on(call_site, target);
1299 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1300 }
1301 }
1302 JVM_END
1304 /**
1305 * Throws a java/lang/UnsupportedOperationException unconditionally.
1306 * This is required by the specification of MethodHandle.invoke if
1307 * invoked directly.
1308 */
1309 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1310 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1311 return NULL;
1312 }
1313 JVM_END
1315 /**
1316 * Throws a java/lang/UnsupportedOperationException unconditionally.
1317 * This is required by the specification of MethodHandle.invokeExact if
1318 * invoked directly.
1319 */
1320 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1321 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1322 return NULL;
1323 }
1324 JVM_END
1326 /// JVM_RegisterMethodHandleMethods
1328 #undef CS // Solaris builds complain
1330 #define LANG "Ljava/lang/"
1331 #define JLINV "Ljava/lang/invoke/"
1333 #define OBJ LANG"Object;"
1334 #define CLS LANG"Class;"
1335 #define STRG LANG"String;"
1336 #define CS JLINV"CallSite;"
1337 #define MT JLINV"MethodType;"
1338 #define MH JLINV"MethodHandle;"
1339 #define MEM JLINV"MemberName;"
1341 #define CC (char*) /*cast a literal from (const char*)*/
1342 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1344 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1345 static JNINativeMethod MHN_methods[] = {
1346 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
1347 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
1348 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
1349 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
1350 // static native int getNamedCon(int which, Object[] name)
1351 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
1352 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1353 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1354 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
1355 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
1356 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1357 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1358 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
1359 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
1360 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
1361 };
1363 static JNINativeMethod MH_methods[] = {
1364 // UnsupportedOperationException throwers
1365 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
1366 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
1367 };
1369 /**
1370 * Helper method to register native methods.
1371 */
1372 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1373 int status = env->RegisterNatives(clazz, methods, nMethods);
1374 if (status != JNI_OK || env->ExceptionOccurred()) {
1375 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1376 env->ExceptionClear();
1377 return false;
1378 }
1379 return true;
1380 }
1382 /**
1383 * This one function is exported, used by NativeLookup.
1384 */
1385 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1386 if (!EnableInvokeDynamic) {
1387 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
1388 return; // bind nothing
1389 }
1391 assert(!MethodHandles::enabled(), "must not be enabled");
1392 bool enable_MH = true;
1394 jclass MH_class = NULL;
1395 if (SystemDictionary::MethodHandle_klass() == NULL) {
1396 enable_MH = false;
1397 } else {
1398 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1399 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1400 }
1402 if (enable_MH) {
1403 ThreadToNativeFromVM ttnfv(thread);
1405 if (enable_MH) {
1406 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1407 }
1408 if (enable_MH) {
1409 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1410 }
1411 }
1413 if (TraceInvokeDynamic) {
1414 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1415 }
1417 if (enable_MH) {
1418 MethodHandles::generate_adapters();
1419 MethodHandles::set_enabled(true);
1420 }
1421 }
1422 JVM_END