Fri, 08 May 2015 14:00:24 -0400
8030680: 292 cleanup from default method code assessment
Summary: small code improvements for increased robustness
Reviewed-by: acorn, coleenp
Contributed-by: michael.haupt@oracle.com
1 /*
2 * Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "compiler/compileBroker.hpp"
28 #include "interpreter/interpreter.hpp"
29 #include "interpreter/oopMapCache.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "prims/methodHandles.hpp"
33 #include "prims/jvmtiRedefineClassesTrace.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 // This method is used from java.lang.invoke.MemberName constructors.
131 // It fills in the new MemberName from a java.lang.reflect.Member.
132 Thread* thread = Thread::current();
133 oop target_oop = target();
134 Klass* target_klass = target_oop->klass();
135 if (target_klass == SystemDictionary::reflect_Field_klass()) {
136 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
137 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
138 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
139 if (!k.is_null() && k->oop_is_instance()) {
140 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
141 oop mname2 = init_field_MemberName(mname, fd);
142 if (mname2 != NULL) {
143 // Since we have the reified name and type handy, add them to the result.
144 if (java_lang_invoke_MemberName::name(mname2) == NULL)
145 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
146 if (java_lang_invoke_MemberName::type(mname2) == NULL)
147 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
148 }
149 return mname2;
150 }
151 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
152 oop clazz = java_lang_reflect_Method::clazz(target_oop);
153 int slot = java_lang_reflect_Method::slot(target_oop);
154 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
155 if (!k.is_null() && k->oop_is_instance()) {
156 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
157 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
158 return NULL; // do not resolve unless there is a concrete signature
159 CallInfo info(m, k());
160 return init_method_MemberName(mname, info);
161 }
162 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
163 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
164 int slot = java_lang_reflect_Constructor::slot(target_oop);
165 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
166 if (!k.is_null() && k->oop_is_instance()) {
167 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
168 if (m == NULL) return NULL;
169 CallInfo info(m, k());
170 return init_method_MemberName(mname, info);
171 }
172 }
173 return NULL;
174 }
176 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info, bool intern) {
177 assert(info.resolved_appendix().is_null(), "only normal methods here");
178 methodHandle m = info.resolved_method();
179 assert(m.not_null(), "null method handle");
180 KlassHandle m_klass = m->method_holder();
181 assert(m.not_null(), "null holder for method handle");
182 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
183 int vmindex = Method::invalid_vtable_index;
185 switch (info.call_kind()) {
186 case CallInfo::itable_call:
187 vmindex = info.itable_index();
188 // More importantly, the itable index only works with the method holder.
189 assert(m_klass->verify_itable_index(vmindex), "");
190 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
191 if (TraceInvokeDynamic) {
192 ResourceMark rm;
193 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
194 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
195 vmindex);
196 m->access_flags().print_on(tty);
197 if (!m->is_abstract()) {
198 tty->print("default");
199 }
200 tty->cr();
201 }
202 break;
204 case CallInfo::vtable_call:
205 vmindex = info.vtable_index();
206 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
207 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
208 if (m_klass->is_interface()) {
209 // This is a vtable call to an interface method (abstract "miranda method" or default method).
210 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
211 // (LinkResolver should help us figure this out.)
212 KlassHandle m_klass_non_interface = info.resolved_klass();
213 if (m_klass_non_interface->is_interface()) {
214 m_klass_non_interface = SystemDictionary::Object_klass();
215 #ifdef ASSERT
216 { ResourceMark rm;
217 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
218 assert(m->name() == m2->name() && m->signature() == m2->signature(),
219 err_msg("at %d, %s != %s", vmindex,
220 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
221 }
222 #endif //ASSERT
223 }
224 if (!m->is_public()) {
225 assert(m->is_public(), "virtual call must be to public interface method");
226 return NULL; // elicit an error later in product build
227 }
228 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
229 m_klass = m_klass_non_interface;
230 }
231 if (TraceInvokeDynamic) {
232 ResourceMark rm;
233 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
234 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
235 m_klass->internal_name(), vmindex);
236 m->access_flags().print_on(tty);
237 if (m->is_default_method()) {
238 tty->print("default");
239 }
240 tty->cr();
241 }
242 break;
244 case CallInfo::direct_call:
245 vmindex = Method::nonvirtual_vtable_index;
246 if (m->is_static()) {
247 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
248 } else if (m->is_initializer()) {
249 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
250 } else {
251 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
252 }
253 break;
255 default: assert(false, "bad CallInfo"); return NULL;
256 }
258 // @CallerSensitive annotation detected
259 if (m->caller_sensitive()) {
260 flags |= CALLER_SENSITIVE;
261 }
263 oop mname_oop = mname();
264 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
265 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
266 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
267 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
268 // Note: name and type can be lazily computed by resolve_MemberName,
269 // if Java code needs them as resolved String and MethodType objects.
270 // The clazz must be eagerly stored, because it provides a GC
271 // root to help keep alive the Method*.
272 // If relevant, the vtable or itable value is stored as vmindex.
273 // This is done eagerly, since it is readily available without
274 // constructing any new objects.
275 return m->method_holder()->add_member_name(mname, intern);
276 }
278 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
279 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
280 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
281 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
282 Metadata* vmtarget = fd.field_holder();
283 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
284 oop mname_oop = mname();
285 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
286 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
287 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
288 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
289 oop type = field_signature_type_or_null(fd.signature());
290 oop name = field_name_or_null(fd.name());
291 if (name != NULL)
292 java_lang_invoke_MemberName::set_name(mname_oop, name);
293 if (type != NULL)
294 java_lang_invoke_MemberName::set_type(mname_oop, type);
295 // Note: name and type can be lazily computed by resolve_MemberName,
296 // if Java code needs them as resolved String and Class objects.
297 // Note that the incoming type oop might be pre-resolved (non-null).
298 // The base clazz and field offset (vmindex) must be eagerly stored,
299 // because they unambiguously identify the field.
300 // Although the fieldDescriptor::_index would also identify the field,
301 // we do not use it, because it is harder to decode.
302 // TO DO: maybe intern mname_oop
303 return mname();
304 }
306 // JVM 2.9 Special Methods:
307 // A method is signature polymorphic if and only if all of the following conditions hold :
308 // * It is declared in the java.lang.invoke.MethodHandle class.
309 // * It has a single formal parameter of type Object[].
310 // * It has a return type of Object.
311 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
312 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
313 if (klass == NULL)
314 return false;
315 // The following test will fail spuriously during bootstrap of MethodHandle itself:
316 // if (klass != SystemDictionary::MethodHandle_klass())
317 // Test the name instead:
318 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
319 return false;
320 Symbol* poly_sig = vmSymbols::object_array_object_signature();
321 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
322 if (m == NULL) return false;
323 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
324 int flags = m->access_flags().as_int();
325 return (flags & required) == required;
326 }
329 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
330 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
331 switch (iid) {
332 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
333 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
334 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
335 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
336 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
337 }
338 assert(false, "");
339 return 0;
340 }
342 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
343 switch (iid) {
344 case vmIntrinsics::_invokeBasic: return 0;
345 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
346 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
347 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
348 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
349 }
350 assert(false, err_msg("iid=%d", iid));
351 return 0;
352 }
354 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
355 vmSymbols::SID name_id = vmSymbols::find_sid(name);
356 switch (name_id) {
357 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
358 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
359 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
360 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
362 // There is one static signature-polymorphic method for each JVM invocation mode.
363 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
364 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
365 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
366 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
367 }
369 // Cover the case of invokeExact and any future variants of invokeFoo.
370 Klass* mh_klass = SystemDictionary::well_known_klass(
371 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
372 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
373 return vmIntrinsics::_invokeGeneric;
375 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
376 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
377 return vmIntrinsics::_none;
378 }
380 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
381 if (klass != NULL &&
382 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
383 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
384 if (iid != vmIntrinsics::_none)
385 return iid;
386 if (is_method_handle_invoke_name(klass, name))
387 return vmIntrinsics::_invokeGeneric;
388 }
389 return vmIntrinsics::_none;
390 }
393 // convert the external string or reflective type to an internal signature
394 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
395 if (java_lang_invoke_MethodType::is_instance(type_str)) {
396 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
397 } else if (java_lang_Class::is_instance(type_str)) {
398 return java_lang_Class::as_signature(type_str, false, THREAD);
399 } else if (java_lang_String::is_instance(type_str)) {
400 if (intern_if_not_found) {
401 return java_lang_String::as_symbol(type_str, THREAD);
402 } else {
403 return java_lang_String::as_symbol_or_null(type_str);
404 }
405 } else {
406 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
407 }
408 }
410 static const char OBJ_SIG[] = "Ljava/lang/Object;";
411 enum { OBJ_SIG_LEN = 18 };
413 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
414 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
415 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
416 const int len = sig->utf8_length();
417 for (int i = 0; i < len; i++) {
418 switch (sig->byte_at(i)) {
419 case 'L':
420 // only java/lang/Object is valid here
421 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
422 return false;
423 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
424 continue;
425 case '(': case ')': case 'V':
426 case 'I': case 'J': case 'F': case 'D':
427 continue;
428 //case '[':
429 //case 'Z': case 'B': case 'C': case 'S':
430 default:
431 return false;
432 }
433 }
434 return true;
435 }
437 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
438 Symbol* bsig = NULL;
439 if (sig == NULL) {
440 return sig;
441 } else if (is_basic_type_signature(sig)) {
442 sig->increment_refcount();
443 return sig; // that was easy
444 } else if (sig->byte_at(0) != '(') {
445 BasicType bt = char2type(sig->byte_at(0));
446 if (is_subword_type(bt)) {
447 bsig = vmSymbols::int_signature();
448 } else {
449 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
450 bsig = vmSymbols::object_signature();
451 }
452 } else {
453 ResourceMark rm;
454 stringStream buffer(128);
455 buffer.put('(');
456 int arg_pos = 0, keep_arg_pos = -1;
457 if (keep_last_arg)
458 keep_arg_pos = ArgumentCount(sig).size() - 1;
459 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
460 BasicType bt = ss.type();
461 size_t this_arg_pos = buffer.size();
462 if (ss.at_return_type()) {
463 buffer.put(')');
464 }
465 if (arg_pos == keep_arg_pos) {
466 buffer.write((char*) ss.raw_bytes(),
467 (int) ss.raw_length());
468 } else if (bt == T_OBJECT || bt == T_ARRAY) {
469 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
470 } else {
471 if (is_subword_type(bt))
472 bt = T_INT;
473 buffer.put(type2char(bt));
474 }
475 arg_pos++;
476 }
477 const char* sigstr = buffer.base();
478 int siglen = (int) buffer.size();
479 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
480 }
481 assert(is_basic_type_signature(bsig) ||
482 // detune assert in case the injected argument is not a basic type:
483 keep_last_arg, "");
484 return bsig;
485 }
487 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
488 Symbol* sig,
489 bool keep_arrays,
490 bool keep_basic_names) {
491 st = st ? st : tty;
492 int len = sig->utf8_length();
493 int array = 0;
494 bool prev_type = false;
495 for (int i = 0; i < len; i++) {
496 char ch = sig->byte_at(i);
497 switch (ch) {
498 case '(': case ')':
499 prev_type = false;
500 st->put(ch);
501 continue;
502 case '[':
503 if (!keep_basic_names && keep_arrays)
504 st->put(ch);
505 array++;
506 continue;
507 case 'L':
508 {
509 if (prev_type) st->put(',');
510 int start = i+1, slash = start;
511 while (++i < len && (ch = sig->byte_at(i)) != ';') {
512 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
513 }
514 if (slash < i) start = slash;
515 if (!keep_basic_names) {
516 st->put('L');
517 } else {
518 for (int j = start; j < i; j++)
519 st->put(sig->byte_at(j));
520 prev_type = true;
521 }
522 break;
523 }
524 default:
525 {
526 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
527 ch = '[';
528 array = 0;
529 }
530 if (prev_type) st->put(',');
531 const char* n = NULL;
532 if (keep_basic_names)
533 n = type2name(char2type(ch));
534 if (n == NULL) {
535 // unknown letter, or we don't want to know its name
536 st->put(ch);
537 } else {
538 st->print("%s", n);
539 prev_type = true;
540 }
541 break;
542 }
543 }
544 // Switch break goes here to take care of array suffix:
545 if (prev_type) {
546 while (array > 0) {
547 st->print("[]");
548 --array;
549 }
550 }
551 array = 0;
552 }
553 }
557 static oop object_java_mirror() {
558 return SystemDictionary::Object_klass()->java_mirror();
559 }
561 oop MethodHandles::field_name_or_null(Symbol* s) {
562 if (s == NULL) return NULL;
563 return StringTable::lookup(s);
564 }
566 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
567 if (s == NULL) return NULL;
568 BasicType bt = FieldType::basic_type(s);
569 if (is_java_primitive(bt)) {
570 assert(s->utf8_length() == 1, "");
571 return java_lang_Class::primitive_mirror(bt);
572 }
573 // Here are some more short cuts for common types.
574 // They are optional, since reference types can be resolved lazily.
575 if (bt == T_OBJECT) {
576 if (s == vmSymbols::object_signature()) {
577 return object_java_mirror();
578 } else if (s == vmSymbols::class_signature()) {
579 return SystemDictionary::Class_klass()->java_mirror();
580 } else if (s == vmSymbols::string_signature()) {
581 return SystemDictionary::String_klass()->java_mirror();
582 }
583 }
584 return NULL;
585 }
588 // An unresolved member name is a mere symbolic reference.
589 // Resolving it plants a vmtarget/vmindex in it,
590 // which refers directly to JVM internals.
591 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
592 Handle empty;
593 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
595 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
596 // Already resolved.
597 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
598 assert(vmindex >= Method::nonvirtual_vtable_index, "");
599 return mname;
600 }
602 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
603 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
604 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
605 int flags = java_lang_invoke_MemberName::flags(mname());
606 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
607 if (!ref_kind_is_valid(ref_kind)) {
608 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
609 }
611 DEBUG_ONLY(int old_vmindex);
612 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
614 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
615 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
616 }
618 instanceKlassHandle defc;
619 {
620 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
621 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
622 if (!defc_klass->oop_is_instance()) {
623 if (!defc_klass->oop_is_array()) return empty;
624 defc_klass = SystemDictionary::Object_klass();
625 }
626 defc = instanceKlassHandle(THREAD, defc_klass);
627 }
628 if (defc.is_null()) {
629 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
630 }
631 defc->link_class(CHECK_(empty)); // possible safepoint
633 // convert the external string name to an internal symbol
634 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
635 if (name == NULL) return empty; // no such name
636 if (name == vmSymbols::class_initializer_name())
637 return empty; // illegal name
639 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
640 if ((flags & ALL_KINDS) == IS_METHOD &&
641 (defc() == SystemDictionary::MethodHandle_klass()) &&
642 (ref_kind == JVM_REF_invokeVirtual ||
643 ref_kind == JVM_REF_invokeSpecial ||
644 // static invocation mode is required for _linkToVirtual, etc.:
645 ref_kind == JVM_REF_invokeStatic)) {
646 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
647 if (iid != vmIntrinsics::_none &&
648 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
649 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
650 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
651 mh_invoke_id = iid;
652 }
653 }
655 // convert the external string or reflective type to an internal signature
656 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
657 if (type == NULL) return empty; // no such signature exists in the VM
659 // Time to do the lookup.
660 switch (flags & ALL_KINDS) {
661 case IS_METHOD:
662 {
663 CallInfo result;
664 {
665 assert(!HAS_PENDING_EXCEPTION, "");
666 if (ref_kind == JVM_REF_invokeStatic) {
667 LinkResolver::resolve_static_call(result,
668 defc, name, type, caller, caller.not_null(), false, THREAD);
669 } else if (ref_kind == JVM_REF_invokeInterface) {
670 LinkResolver::resolve_interface_call(result, Handle(), defc,
671 defc, name, type, caller, caller.not_null(), false, THREAD);
672 } else if (mh_invoke_id != vmIntrinsics::_none) {
673 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
674 LinkResolver::resolve_handle_call(result,
675 defc, name, type, caller, THREAD);
676 } else if (ref_kind == JVM_REF_invokeSpecial) {
677 LinkResolver::resolve_special_call(result,
678 Handle(), defc, name, type, caller, caller.not_null(), THREAD);
679 } else if (ref_kind == JVM_REF_invokeVirtual) {
680 LinkResolver::resolve_virtual_call(result, Handle(), defc,
681 defc, name, type, caller, caller.not_null(), false, THREAD);
682 } else {
683 assert(false, err_msg("ref_kind=%d", ref_kind));
684 }
685 if (HAS_PENDING_EXCEPTION) {
686 return empty;
687 }
688 }
689 if (result.resolved_appendix().not_null()) {
690 // The resolved MemberName must not be accompanied by an appendix argument,
691 // since there is no way to bind this value into the MemberName.
692 // Caller is responsible to prevent this from happening.
693 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
694 }
695 oop mname2 = init_method_MemberName(mname, result);
696 return Handle(THREAD, mname2);
697 }
698 case IS_CONSTRUCTOR:
699 {
700 CallInfo result;
701 {
702 assert(!HAS_PENDING_EXCEPTION, "");
703 if (name == vmSymbols::object_initializer_name()) {
704 LinkResolver::resolve_special_call(result,
705 Handle(), defc, name, type, caller, caller.not_null(), THREAD);
706 } else {
707 break; // will throw after end of switch
708 }
709 if (HAS_PENDING_EXCEPTION) {
710 return empty;
711 }
712 }
713 assert(result.is_statically_bound(), "");
714 oop mname2 = init_method_MemberName(mname, result);
715 return Handle(THREAD, mname2);
716 }
717 case IS_FIELD:
718 {
719 fieldDescriptor result; // find_field initializes fd if found
720 {
721 assert(!HAS_PENDING_EXCEPTION, "");
722 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD);
723 if (HAS_PENDING_EXCEPTION) {
724 return empty;
725 }
726 }
727 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
728 return Handle(THREAD, mname2);
729 }
730 default:
731 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
732 }
734 return empty;
735 }
737 // Conversely, a member name which is only initialized from JVM internals
738 // may have null defc, name, and type fields.
739 // Resolving it plants a vmtarget/vmindex in it,
740 // which refers directly to JVM internals.
741 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
742 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
743 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
744 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
745 if (vmtarget == NULL) {
746 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
747 }
749 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
750 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
751 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
752 int flags = java_lang_invoke_MemberName::flags(mname());
754 if (suppress != 0) {
755 if (suppress & _suppress_defc) have_defc = true;
756 if (suppress & _suppress_name) have_name = true;
757 if (suppress & _suppress_type) have_type = true;
758 }
760 if (have_defc && have_name && have_type) return; // nothing needed
762 switch (flags & ALL_KINDS) {
763 case IS_METHOD:
764 case IS_CONSTRUCTOR:
765 {
766 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
767 methodHandle m(THREAD, (Method*)vmtarget);
768 DEBUG_ONLY(vmtarget = NULL); // safety
769 if (m.is_null()) break;
770 if (!have_defc) {
771 InstanceKlass* defc = m->method_holder();
772 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
773 }
774 if (!have_name) {
775 //not java_lang_String::create_from_symbol; let's intern member names
776 Handle name = StringTable::intern(m->name(), CHECK);
777 java_lang_invoke_MemberName::set_name(mname(), name());
778 }
779 if (!have_type) {
780 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
781 java_lang_invoke_MemberName::set_type(mname(), type());
782 }
783 return;
784 }
785 case IS_FIELD:
786 {
787 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
788 if (!((Klass*) vmtarget)->oop_is_instance()) break;
789 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
790 DEBUG_ONLY(vmtarget = NULL); // safety
791 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
792 fieldDescriptor fd; // find_field initializes fd if found
793 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
794 break; // cannot expand
795 if (!have_defc) {
796 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
797 }
798 if (!have_name) {
799 //not java_lang_String::create_from_symbol; let's intern member names
800 Handle name = StringTable::intern(fd.name(), CHECK);
801 java_lang_invoke_MemberName::set_name(mname(), name());
802 }
803 if (!have_type) {
804 // If it is a primitive field type, don't mess with short strings like "I".
805 Handle type = field_signature_type_or_null(fd.signature());
806 if (type.is_null()) {
807 java_lang_String::create_from_symbol(fd.signature(), CHECK);
808 }
809 java_lang_invoke_MemberName::set_type(mname(), type());
810 }
811 return;
812 }
813 }
814 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
815 }
817 int MethodHandles::find_MemberNames(KlassHandle k,
818 Symbol* name, Symbol* sig,
819 int mflags, KlassHandle caller,
820 int skip, objArrayHandle results) {
821 // %%% take caller into account!
823 Thread* thread = Thread::current();
825 if (k.is_null() || !k->oop_is_instance()) return -1;
827 int rfill = 0, rlimit = results->length(), rskip = skip;
828 // overflow measurement:
829 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
831 int match_flags = mflags;
832 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
833 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
834 bool local_only = !(search_superc | search_intfc);
835 bool classes_only = false;
837 if (name != NULL) {
838 if (name->utf8_length() == 0) return 0; // a match is not possible
839 }
840 if (sig != NULL) {
841 if (sig->utf8_length() == 0) return 0; // a match is not possible
842 if (sig->byte_at(0) == '(')
843 match_flags &= ~(IS_FIELD | IS_TYPE);
844 else
845 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
846 }
848 if ((match_flags & IS_TYPE) != 0) {
849 // NYI, and Core Reflection works quite well for this query
850 }
852 if ((match_flags & IS_FIELD) != 0) {
853 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
854 if (name != NULL && st.name() != name)
855 continue;
856 if (sig != NULL && st.signature() != sig)
857 continue;
858 // passed the filters
859 if (rskip > 0) {
860 --rskip;
861 } else if (rfill < rlimit) {
862 Handle result(thread, results->obj_at(rfill++));
863 if (!java_lang_invoke_MemberName::is_instance(result()))
864 return -99; // caller bug!
865 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
866 if (saved != result())
867 results->obj_at_put(rfill-1, saved); // show saved instance to user
868 } else if (++overflow >= overflow_limit) {
869 match_flags = 0; break; // got tired of looking at overflow
870 }
871 }
872 }
874 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
875 // watch out for these guys:
876 Symbol* init_name = vmSymbols::object_initializer_name();
877 Symbol* clinit_name = vmSymbols::class_initializer_name();
878 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
879 bool negate_name_test = false;
880 // fix name so that it captures the intention of IS_CONSTRUCTOR
881 if (!(match_flags & IS_METHOD)) {
882 // constructors only
883 if (name == NULL) {
884 name = init_name;
885 } else if (name != init_name) {
886 return 0; // no constructors of this method name
887 }
888 } else if (!(match_flags & IS_CONSTRUCTOR)) {
889 // methods only
890 if (name == NULL) {
891 name = init_name;
892 negate_name_test = true; // if we see the name, we *omit* the entry
893 } else if (name == init_name) {
894 return 0; // no methods of this constructor name
895 }
896 } else {
897 // caller will accept either sort; no need to adjust name
898 }
899 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
900 Method* m = st.method();
901 Symbol* m_name = m->name();
902 if (m_name == clinit_name)
903 continue;
904 if (name != NULL && ((m_name != name) ^ negate_name_test))
905 continue;
906 if (sig != NULL && m->signature() != sig)
907 continue;
908 // passed the filters
909 if (rskip > 0) {
910 --rskip;
911 } else if (rfill < rlimit) {
912 Handle result(thread, results->obj_at(rfill++));
913 if (!java_lang_invoke_MemberName::is_instance(result()))
914 return -99; // caller bug!
915 CallInfo info(m);
916 // Since this is going through the methods to create MemberNames, don't search
917 // for matching methods already in the table
918 oop saved = MethodHandles::init_method_MemberName(result, info, /*intern*/false);
919 if (saved != result())
920 results->obj_at_put(rfill-1, saved); // show saved instance to user
921 } else if (++overflow >= overflow_limit) {
922 match_flags = 0; break; // got tired of looking at overflow
923 }
924 }
925 }
927 // return number of elements we at leasted wanted to initialize
928 return rfill + overflow;
929 }
931 //------------------------------------------------------------------------------
932 // MemberNameTable
933 //
935 MemberNameTable::MemberNameTable(int methods_cnt)
936 : GrowableArray<jweak>(methods_cnt, true) {
937 assert_locked_or_safepoint(MemberNameTable_lock);
938 }
940 MemberNameTable::~MemberNameTable() {
941 assert_locked_or_safepoint(MemberNameTable_lock);
942 int len = this->length();
944 for (int idx = 0; idx < len; idx++) {
945 jweak ref = this->at(idx);
946 JNIHandles::destroy_weak_global(ref);
947 }
948 }
950 oop MemberNameTable::add_member_name(jweak mem_name_wref) {
951 assert_locked_or_safepoint(MemberNameTable_lock);
952 this->push(mem_name_wref);
953 return JNIHandles::resolve(mem_name_wref);
954 }
956 oop MemberNameTable::find_or_add_member_name(jweak mem_name_wref) {
957 assert_locked_or_safepoint(MemberNameTable_lock);
958 oop new_mem_name = JNIHandles::resolve(mem_name_wref);
960 // Find matching member name in the list.
961 // This is linear because these are short lists.
962 int len = this->length();
963 int new_index = len;
964 for (int idx = 0; idx < len; idx++) {
965 oop mname = JNIHandles::resolve(this->at(idx));
966 if (mname == NULL) {
967 new_index = idx;
968 continue;
969 }
970 if (java_lang_invoke_MemberName::equals(new_mem_name, mname)) {
971 JNIHandles::destroy_weak_global(mem_name_wref);
972 return mname;
973 }
974 }
975 // Not found, push the new one, or reuse empty slot
976 this->at_put_grow(new_index, mem_name_wref);
977 return new_mem_name;
978 }
980 #if INCLUDE_JVMTI
981 // It is called at safepoint only for RedefineClasses
982 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) {
983 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
984 // For each redefined method
985 for (int idx = 0; idx < length(); idx++) {
986 oop mem_name = JNIHandles::resolve(this->at(idx));
987 if (mem_name == NULL) {
988 continue;
989 }
990 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
992 if (old_method == NULL || !old_method->is_old()) {
993 continue; // skip uninteresting entries
994 }
995 if (old_method->is_deleted()) {
996 // skip entries with deleted methods
997 continue;
998 }
999 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum());
1001 assert(new_method != NULL, "method_with_idnum() should not be NULL");
1002 assert(old_method != new_method, "sanity check");
1004 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method);
1006 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1007 if (!(*trace_name_printed)) {
1008 // RC_TRACE_MESG macro has an embedded ResourceMark
1009 RC_TRACE_MESG(("adjust: name=%s",
1010 old_method->method_holder()->external_name()));
1011 *trace_name_printed = true;
1012 }
1013 // RC_TRACE macro has an embedded ResourceMark
1014 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
1015 new_method->name()->as_C_string(),
1016 new_method->signature()->as_C_string()));
1017 }
1018 }
1019 }
1020 #endif // INCLUDE_JVMTI
1022 //
1023 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1024 // They are the private interface between this JVM and the HotSpot-specific
1025 // Java code that implements JSR 292 method handles.
1026 //
1027 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1028 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1029 //
1031 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
1032 switch (which) {
1033 case MethodHandles::GC_COUNT_GWT:
1034 #ifdef COMPILER2
1035 return true;
1036 #else
1037 return false;
1038 #endif
1039 }
1040 return 0;
1041 }
1042 JVM_END
1044 #ifndef PRODUCT
1045 #define EACH_NAMED_CON(template, requirement) \
1046 template(MethodHandles,GC_COUNT_GWT) \
1047 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1048 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1049 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1050 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1051 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1052 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1053 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1054 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1055 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1056 template(MethodHandles,GC_LAMBDA_SUPPORT) \
1057 /*end*/
1059 #define IGNORE_REQ(req_expr) /* req_expr */
1060 #define ONE_PLUS(scope,value) 1+
1061 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1062 #define VALUE_COMMA(scope,value) scope::value,
1063 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1064 #define STRING_NULL(scope,value) #value "\0"
1065 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1067 static bool advertise_con_value(int which) {
1068 if (which < 0) return false;
1069 bool ok = true;
1070 int count = 0;
1071 #define INC_COUNT(scope,value) \
1072 ++count;
1073 #define CHECK_REQ(req_expr) \
1074 if (which < count) return ok; \
1075 ok = (req_expr);
1076 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1077 #undef INC_COUNT
1078 #undef CHECK_REQ
1079 assert(count == con_value_count, "");
1080 if (which < count) return ok;
1081 return false;
1082 }
1084 #undef ONE_PLUS
1085 #undef VALUE_COMMA
1086 #undef STRING_NULL
1087 #undef EACH_NAMED_CON
1088 #endif // PRODUCT
1090 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1091 #ifndef PRODUCT
1092 if (advertise_con_value(which)) {
1093 assert(which >= 0 && which < con_value_count, "");
1094 int con = con_values[which];
1095 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1096 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1097 const char* str = &con_names[0];
1098 for (int i = 0; i < which; i++)
1099 str += strlen(str) + 1; // skip name and null
1100 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1101 box->obj_at_put(0, name);
1102 }
1103 return con;
1104 }
1105 #endif
1106 return 0;
1107 }
1108 JVM_END
1110 // void init(MemberName self, AccessibleObject ref)
1111 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1112 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1113 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1114 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1115 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1116 MethodHandles::init_MemberName(mname, target);
1117 }
1118 JVM_END
1120 // void expand(MemberName self)
1121 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1122 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1123 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1124 MethodHandles::expand_MemberName(mname, 0, CHECK);
1125 }
1126 JVM_END
1128 // void resolve(MemberName self, Class<?> caller)
1129 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1130 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1131 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1133 // The trusted Java code that calls this method should already have performed
1134 // access checks on behalf of the given caller. But, we can verify this.
1135 if (VerifyMethodHandles && caller_jh != NULL &&
1136 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1137 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1138 if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
1139 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1140 }
1142 // Reflection::verify_class_access can only handle instance classes.
1143 if (reference_klass != NULL && reference_klass->oop_is_instance()) {
1144 // Emulate LinkResolver::check_klass_accessability.
1145 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1146 if (!Reflection::verify_class_access(caller,
1147 reference_klass,
1148 true)) {
1149 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1150 }
1151 }
1152 }
1154 KlassHandle caller(THREAD,
1155 caller_jh == NULL ? (Klass*) NULL :
1156 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1157 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1159 if (resolved.is_null()) {
1160 int flags = java_lang_invoke_MemberName::flags(mname());
1161 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1162 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1163 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1164 }
1165 if ((flags & ALL_KINDS) == IS_FIELD) {
1166 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1167 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1168 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1169 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1170 } else {
1171 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1172 }
1173 }
1175 return JNIHandles::make_local(THREAD, resolved());
1176 }
1177 JVM_END
1179 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1180 if (mname == NULL ||
1181 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1182 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1183 } else {
1184 int flags = java_lang_invoke_MemberName::flags(mname);
1185 if ((flags & IS_FIELD) != 0 &&
1186 (must_be_static
1187 ? (flags & JVM_ACC_STATIC) != 0
1188 : (flags & JVM_ACC_STATIC) == 0)) {
1189 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1190 return (jlong) vmindex;
1191 }
1192 }
1193 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1194 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1195 return 0;
1196 }
1198 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1199 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1200 }
1201 JVM_END
1203 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1204 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1205 }
1206 JVM_END
1208 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1209 // use the other function to perform sanity checks:
1210 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1211 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1212 return JNIHandles::make_local(THREAD, clazz);
1213 }
1214 JVM_END
1216 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1217 if (mname_jh == NULL) return NULL;
1218 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1219 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1220 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1221 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1222 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1223 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1224 result->obj_at_put(0, x);
1225 x = NULL;
1226 if (vmtarget == NULL) {
1227 x = NULL;
1228 } else if (vmtarget->is_klass()) {
1229 x = ((Klass*) vmtarget)->java_mirror();
1230 } else if (vmtarget->is_method()) {
1231 x = mname();
1232 }
1233 result->obj_at_put(1, x);
1234 return JNIHandles::make_local(env, result());
1235 }
1236 JVM_END
1240 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1241 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1242 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1243 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1244 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1245 if (clazz_jh == NULL || results_jh == NULL) return -1;
1246 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1248 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1249 if (results.is_null() || !results->is_objArray()) return -1;
1251 TempNewSymbol name = NULL;
1252 TempNewSymbol sig = NULL;
1253 if (name_jh != NULL) {
1254 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1255 if (name == NULL) return 0; // a match is not possible
1256 }
1257 if (sig_jh != NULL) {
1258 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1259 if (sig == NULL) return 0; // a match is not possible
1260 }
1262 KlassHandle caller;
1263 if (caller_jh != NULL) {
1264 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1265 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1266 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1267 }
1269 if (name != NULL && sig != NULL && results.not_null()) {
1270 // try a direct resolve
1271 // %%% TO DO
1272 }
1274 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1275 caller, skip, results);
1276 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1277 return res;
1278 }
1279 JVM_END
1281 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1282 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1283 Handle target (THREAD, JNIHandles::resolve(target_jh));
1284 {
1285 // Walk all nmethods depending on this call site.
1286 MutexLocker mu(Compile_lock, thread);
1287 Universe::flush_dependents_on(call_site, target);
1288 java_lang_invoke_CallSite::set_target(call_site(), target());
1289 }
1290 }
1291 JVM_END
1293 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1294 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1295 Handle target (THREAD, JNIHandles::resolve(target_jh));
1296 {
1297 // Walk all nmethods depending on this call site.
1298 MutexLocker mu(Compile_lock, thread);
1299 Universe::flush_dependents_on(call_site, target);
1300 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1301 }
1302 }
1303 JVM_END
1305 /**
1306 * Throws a java/lang/UnsupportedOperationException unconditionally.
1307 * This is required by the specification of MethodHandle.invoke if
1308 * invoked directly.
1309 */
1310 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1311 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1312 return NULL;
1313 }
1314 JVM_END
1316 /**
1317 * Throws a java/lang/UnsupportedOperationException unconditionally.
1318 * This is required by the specification of MethodHandle.invokeExact if
1319 * invoked directly.
1320 */
1321 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1322 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1323 return NULL;
1324 }
1325 JVM_END
1327 /// JVM_RegisterMethodHandleMethods
1329 #undef CS // Solaris builds complain
1331 #define LANG "Ljava/lang/"
1332 #define JLINV "Ljava/lang/invoke/"
1334 #define OBJ LANG "Object;"
1335 #define CLS LANG "Class;"
1336 #define STRG LANG "String;"
1337 #define CS JLINV "CallSite;"
1338 #define MT JLINV "MethodType;"
1339 #define MH JLINV "MethodHandle;"
1340 #define MEM JLINV "MemberName;"
1342 #define CC (char*) /*cast a literal from (const char*)*/
1343 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1345 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1346 static JNINativeMethod MHN_methods[] = {
1347 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1348 {CC"expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1349 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)},
1350 {CC "getConstant", CC "(I)I", FN_PTR(MHN_getConstant)},
1351 // static native int getNamedCon(int which, Object[] name)
1352 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1353 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1354 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1355 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1356 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1357 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1358 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1359 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1360 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1361 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1362 };
1364 static JNINativeMethod MH_methods[] = {
1365 // UnsupportedOperationException throwers
1366 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1367 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1368 };
1370 /**
1371 * Helper method to register native methods.
1372 */
1373 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1374 int status = env->RegisterNatives(clazz, methods, nMethods);
1375 if (status != JNI_OK || env->ExceptionOccurred()) {
1376 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1377 env->ExceptionClear();
1378 return false;
1379 }
1380 return true;
1381 }
1383 /**
1384 * This one function is exported, used by NativeLookup.
1385 */
1386 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1387 if (!EnableInvokeDynamic) {
1388 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
1389 return; // bind nothing
1390 }
1392 assert(!MethodHandles::enabled(), "must not be enabled");
1393 bool enable_MH = true;
1395 jclass MH_class = NULL;
1396 if (SystemDictionary::MethodHandle_klass() == NULL) {
1397 enable_MH = false;
1398 } else {
1399 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1400 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1401 }
1403 if (enable_MH) {
1404 ThreadToNativeFromVM ttnfv(thread);
1406 if (enable_MH) {
1407 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1408 }
1409 if (enable_MH) {
1410 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1411 }
1412 }
1414 if (TraceInvokeDynamic) {
1415 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1416 }
1418 if (enable_MH) {
1419 MethodHandles::generate_adapters();
1420 MethodHandles::set_enabled(true);
1421 }
1422 }
1423 JVM_END