1 /*
2 * Copyright (c) 2008, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/dependencyContext.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "interpreter/oopMapCache.hpp"
33 #include "interpreter/linkResolver.hpp"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "oops/objArrayOop.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/methodHandles.hpp"
40 #include "runtime/compilationPolicy.hpp"
41 #include "runtime/javaCalls.hpp"
42 #include "runtime/timerTrace.hpp"
43 #include "runtime/reflection.hpp"
44 #include "runtime/signature.hpp"
45 #include "runtime/stubRoutines.hpp"
46 #include "utilities/exceptions.hpp"
47
48
49 /*
50 * JSR 292 reference implementation: method handles
51 * The JDK 7 reference implementation represented method handle
52 * combinations as chains. Each link in the chain had a "vmentry"
53 * field which pointed at a bit of assembly code which performed
54 * one transformation before dispatching to the next link in the chain.
55 *
56 * The current reference implementation pushes almost all code generation
57 * responsibility to (trusted) Java code. A method handle contains a
58 * pointer to its "LambdaForm", which embodies all details of the method
59 * handle's behavior. The LambdaForm is a normal Java object, managed
60 * by a runtime coded in Java.
61 */
62
63 bool MethodHandles::_enabled = false; // set true after successful native linkage
64 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
65
66 /**
67 * Generates method handle adapters. Returns 'false' if memory allocation
68 * failed and true otherwise.
69 */
70 void MethodHandles::generate_adapters() {
71 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
72 assert(_adapter_code == NULL, "generate only once");
73
74 ResourceMark rm;
75 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime));
76 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
77 CodeBuffer code(_adapter_code);
78 MethodHandlesAdapterGenerator g(&code);
79 g.generate();
80 code.log_section_sizes("MethodHandlesAdapterBlob");
81 }
82
83 //------------------------------------------------------------------------------
84 // MethodHandlesAdapterGenerator::generate
85 //
86 void MethodHandlesAdapterGenerator::generate() {
87 // Generate generic method handle adapters.
88 // Generate interpreter entries
89 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
90 mk <= Interpreter::method_handle_invoke_LAST;
91 mk = Interpreter::MethodKind(1 + (int)mk)) {
92 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
93 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
94 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
95 if (entry != NULL) {
96 Interpreter::set_entry_for_kind(mk, entry);
97 }
98 // If the entry is not set, it will throw AbstractMethodError.
99 }
100 }
101
102 void MethodHandles::set_enabled(bool z) {
103 if (_enabled != z) {
104 guarantee(z, "can only enable once");
105 _enabled = z;
106 }
107 }
108
109 // MemberName support
110
111 // import java_lang_invoke_MemberName.*
112 enum {
113 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
114 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
115 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
116 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
117 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
118 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
119 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
120 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
121 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
122 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
123 };
124
125 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
126 // This method is used from java.lang.invoke.MemberName constructors.
127 // It fills in the new MemberName from a java.lang.reflect.Member.
128 Thread* thread = Thread::current();
129 oop target_oop = target();
130 Klass* target_klass = target_oop->klass();
131 if (target_klass == SystemDictionary::reflect_Field_klass()) {
132 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
133 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
134 Klass* k = java_lang_Class::as_Klass(clazz);
135 if (k != NULL && k->is_instance_klass()) {
136 fieldDescriptor fd(InstanceKlass::cast(k), slot);
137 oop mname2 = init_field_MemberName(mname, fd);
138 if (mname2 != NULL) {
139 // Since we have the reified name and type handy, add them to the result.
140 if (java_lang_invoke_MemberName::name(mname2) == NULL)
141 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
142 if (java_lang_invoke_MemberName::type(mname2) == NULL)
143 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
144 }
145 return mname2;
146 }
147 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
148 oop clazz = java_lang_reflect_Method::clazz(target_oop);
149 int slot = java_lang_reflect_Method::slot(target_oop);
150 Klass* k = java_lang_Class::as_Klass(clazz);
151 if (k != NULL && k->is_instance_klass()) {
152 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
153 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
154 return NULL; // do not resolve unless there is a concrete signature
155 CallInfo info(m, k, CHECK_NULL);
156 return init_method_MemberName(mname, info);
157 }
158 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
159 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
160 int slot = java_lang_reflect_Constructor::slot(target_oop);
161 Klass* k = java_lang_Class::as_Klass(clazz);
162 if (k != NULL && k->is_instance_klass()) {
163 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
164 if (m == NULL) return NULL;
165 CallInfo info(m, k, CHECK_NULL);
166 return init_method_MemberName(mname, info);
167 }
168 }
169 return NULL;
170 }
171
172 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
173 assert(info.resolved_appendix().is_null(), "only normal methods here");
174 methodHandle m = info.resolved_method();
175 assert(m.not_null(), "null method handle");
176 Klass* m_klass = m->method_holder();
177 assert(m_klass != NULL, "null holder for method handle");
178 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
179 int vmindex = Method::invalid_vtable_index;
180
181 switch (info.call_kind()) {
182 case CallInfo::itable_call:
183 vmindex = info.itable_index();
184 // More importantly, the itable index only works with the method holder.
185 assert(m_klass->verify_itable_index(vmindex), "");
186 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
187 if (TraceInvokeDynamic) {
188 ttyLocker ttyl;
189 ResourceMark rm;
190 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
191 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
192 vmindex);
193 m->access_flags().print_on(tty);
194 if (!m->is_abstract()) {
195 tty->print("default");
196 }
197 tty->cr();
198 }
199 break;
200
201 case CallInfo::vtable_call:
202 vmindex = info.vtable_index();
203 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
204 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe");
205 if (m_klass->is_interface()) {
206 // This is a vtable call to an interface method (abstract "miranda method" or default method).
207 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
208 // (LinkResolver should help us figure this out.)
209 Klass* m_klass_non_interface = info.resolved_klass();
210 if (m_klass_non_interface->is_interface()) {
211 m_klass_non_interface = SystemDictionary::Object_klass();
212 #ifdef ASSERT
213 { ResourceMark rm;
214 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex);
215 assert(m->name() == m2->name() && m->signature() == m2->signature(),
216 "at %d, %s != %s", vmindex,
217 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
218 }
219 #endif //ASSERT
220 }
221 if (!m->is_public()) {
222 assert(m->is_public(), "virtual call must be to public interface method");
223 return NULL; // elicit an error later in product build
224 }
225 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe");
226 m_klass = m_klass_non_interface;
227 }
228 if (TraceInvokeDynamic) {
229 ttyLocker ttyl;
230 ResourceMark rm;
231 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
232 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
233 m_klass->internal_name(), vmindex);
234 m->access_flags().print_on(tty);
235 if (m->is_default_method()) {
236 tty->print("default");
237 }
238 tty->cr();
239 }
240 break;
241
242 case CallInfo::direct_call:
243 vmindex = Method::nonvirtual_vtable_index;
244 if (m->is_static()) {
245 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
246 } else if (m->is_initializer()) {
247 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
248 } else {
249 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
250 }
251 break;
252
253 default: assert(false, "bad CallInfo"); return NULL;
254 }
255
256 // @CallerSensitive annotation detected
257 if (m->caller_sensitive()) {
258 flags |= CALLER_SENSITIVE;
259 }
260
261 Handle resolved_method = info.resolved_method_name();
262 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m(),
263 "Should not change after link resolultion");
264
265 oop mname_oop = mname();
266 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
267 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
268 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index
269 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror());
270 // Note: name and type can be lazily computed by resolve_MemberName,
271 // if Java code needs them as resolved String and MethodType objects.
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 mname();
276 }
277
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 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
283
284 oop mname_oop = mname();
285 java_lang_invoke_MemberName::set_flags (mname_oop, flags);
286 java_lang_invoke_MemberName::set_method (mname_oop, NULL);
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
290 oop type = field_signature_type_or_null(fd.signature());
291 oop name = field_name_or_null(fd.name());
292 if (name != NULL)
293 java_lang_invoke_MemberName::set_name(mname_oop, name);
294 if (type != NULL)
295 java_lang_invoke_MemberName::set_type(mname_oop, type);
296 // Note: name and type can be lazily computed by resolve_MemberName,
297 // if Java code needs them as resolved String and Class objects.
298 // Note that the incoming type oop might be pre-resolved (non-null).
299 // The base clazz and field offset (vmindex) must be eagerly stored,
300 // because they unambiguously identify the field.
301 // Although the fieldDescriptor::_index would also identify the field,
302 // we do not use it, because it is harder to decode.
303 // TO DO: maybe intern mname_oop
304 return mname();
305 }
306
307 // JVM 2.9 Special Methods:
308 // A method is signature polymorphic if and only if all of the following conditions hold :
309 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes.
310 // * It has a single formal parameter of type Object[].
311 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type.
312 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
313 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
314 if (klass == NULL)
315 return false;
316 // The following test will fail spuriously during bootstrap of MethodHandle itself:
317 // if (klass != SystemDictionary::MethodHandle_klass())
318 // Test the name instead:
319 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() &&
320 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) {
321 return false;
322 }
323
324 // Look up signature polymorphic method with polymorphic return type
325 Symbol* poly_sig = vmSymbols::object_array_object_signature();
326 InstanceKlass* iklass = InstanceKlass::cast(klass);
327 Method* m = iklass->find_method(name, poly_sig);
328 if (m != NULL) {
329 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
330 int flags = m->access_flags().as_int();
331 if ((flags & required) == required) {
332 return true;
333 }
334 }
335
336 // Look up signature polymorphic method with non-polymorphic (non Object) return type
337 int me;
338 int ms = iklass->find_method_by_name(name, &me);
339 if (ms == -1) return false;
340 for (; ms < me; ms++) {
341 Method* m = iklass->methods()->at(ms);
342 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
343 int flags = m->access_flags().as_int();
344 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) {
345 return true;
346 }
347 }
348 return false;
349 }
350
351
352 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
353 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
354 switch (iid) {
355 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
356 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
357 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
358 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
359 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
360 }
361 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
362 return 0;
363 }
364
365 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) {
366 switch(id) {
367 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual;
368 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface;
369 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic;
370 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial;
371 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle;
372 default:
373 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id));
374 return Bytecodes::_illegal;
375 }
376 }
377
378 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
379 switch (iid) {
380 case vmIntrinsics::_invokeBasic: return 0;
381 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
382 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
383 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
384 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
385 }
386 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
387 return 0;
388 }
389
390 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
391 vmSymbols::SID name_id = vmSymbols::find_sid(name);
392 switch (name_id) {
393 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
394 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
395 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
396 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
397
398 // There is one static signature-polymorphic method for each JVM invocation mode.
399 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
400 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
401 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
402 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
403 }
404
405 // Cover the case of invokeExact and any future variants of invokeFoo.
406 Klass* mh_klass = SystemDictionary::well_known_klass(
407 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
408 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) {
409 return vmIntrinsics::_invokeGeneric;
410 }
411
412 // Cover the case of methods on VarHandle.
413 Klass* vh_klass = SystemDictionary::well_known_klass(
414 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) );
415 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) {
416 return vmIntrinsics::_invokeGeneric;
417 }
418
419 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
420 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
421 return vmIntrinsics::_none;
422 }
423
424 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
425 if (klass != NULL &&
426 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() ||
427 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) {
428 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
429 if (iid != vmIntrinsics::_none)
430 return iid;
431 if (is_method_handle_invoke_name(klass, name))
432 return vmIntrinsics::_invokeGeneric;
433 }
434 return vmIntrinsics::_none;
435 }
436
437
438 // convert the external string or reflective type to an internal signature
439 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
440 if (java_lang_invoke_MethodType::is_instance(type_str)) {
441 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
442 } else if (java_lang_Class::is_instance(type_str)) {
443 return java_lang_Class::as_signature(type_str, false, THREAD);
444 } else if (java_lang_String::is_instance_inlined(type_str)) {
445 if (intern_if_not_found) {
446 return java_lang_String::as_symbol(type_str, THREAD);
447 } else {
448 return java_lang_String::as_symbol_or_null(type_str);
449 }
450 } else {
451 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
452 }
453 }
454
455 static const char OBJ_SIG[] = "Ljava/lang/Object;";
456 enum { OBJ_SIG_LEN = 18 };
457
458 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
459 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
460 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
461 const int len = sig->utf8_length();
462 for (int i = 0; i < len; i++) {
463 switch (sig->byte_at(i)) {
464 case 'L':
465 // only java/lang/Object is valid here
466 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
467 return false;
468 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
469 continue;
470 case '(': case ')': case 'V':
471 case 'I': case 'J': case 'F': case 'D':
472 continue;
473 //case '[':
474 //case 'Z': case 'B': case 'C': case 'S':
475 default:
476 return false;
477 }
478 }
479 return true;
480 }
481
482 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
483 Symbol* bsig = NULL;
484 if (sig == NULL) {
485 return sig;
486 } else if (is_basic_type_signature(sig)) {
487 sig->increment_refcount();
488 return sig; // that was easy
489 } else if (sig->byte_at(0) != '(') {
490 BasicType bt = char2type(sig->byte_at(0));
491 if (is_subword_type(bt)) {
492 bsig = vmSymbols::int_signature();
493 } else {
494 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
495 bsig = vmSymbols::object_signature();
496 }
497 } else {
498 ResourceMark rm;
499 stringStream buffer(128);
500 buffer.put('(');
501 int arg_pos = 0, keep_arg_pos = -1;
502 if (keep_last_arg)
503 keep_arg_pos = ArgumentCount(sig).size() - 1;
504 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
505 BasicType bt = ss.type();
506 size_t this_arg_pos = buffer.size();
507 if (ss.at_return_type()) {
508 buffer.put(')');
509 }
510 if (arg_pos == keep_arg_pos) {
511 buffer.write((char*) ss.raw_bytes(),
512 (int) ss.raw_length());
513 } else if (bt == T_OBJECT || bt == T_ARRAY) {
514 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
515 } else {
516 if (is_subword_type(bt))
517 bt = T_INT;
518 buffer.put(type2char(bt));
519 }
520 arg_pos++;
521 }
522 const char* sigstr = buffer.base();
523 int siglen = (int) buffer.size();
524 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
525 }
526 assert(is_basic_type_signature(bsig) ||
527 // detune assert in case the injected argument is not a basic type:
528 keep_last_arg, "");
529 return bsig;
530 }
531
532 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
533 Symbol* sig,
534 bool keep_arrays,
535 bool keep_basic_names) {
536 st = st ? st : tty;
537 int len = sig->utf8_length();
538 int array = 0;
539 bool prev_type = false;
540 for (int i = 0; i < len; i++) {
541 char ch = sig->byte_at(i);
542 switch (ch) {
543 case '(': case ')':
544 prev_type = false;
545 st->put(ch);
546 continue;
547 case '[':
548 if (!keep_basic_names && keep_arrays)
549 st->put(ch);
550 array++;
551 continue;
552 case 'L':
553 {
554 if (prev_type) st->put(',');
555 int start = i+1, slash = start;
556 while (++i < len && (ch = sig->byte_at(i)) != ';') {
557 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
558 }
559 if (slash < i) start = slash;
560 if (!keep_basic_names) {
561 st->put('L');
562 } else {
563 for (int j = start; j < i; j++)
564 st->put(sig->byte_at(j));
565 prev_type = true;
566 }
567 break;
568 }
569 default:
570 {
571 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
572 ch = '[';
573 array = 0;
574 }
575 if (prev_type) st->put(',');
576 const char* n = NULL;
577 if (keep_basic_names)
578 n = type2name(char2type(ch));
579 if (n == NULL) {
580 // unknown letter, or we don't want to know its name
581 st->put(ch);
582 } else {
583 st->print("%s", n);
584 prev_type = true;
585 }
586 break;
587 }
588 }
589 // Switch break goes here to take care of array suffix:
590 if (prev_type) {
591 while (array > 0) {
592 st->print("[]");
593 --array;
594 }
595 }
596 array = 0;
597 }
598 }
599
600
601
602 static oop object_java_mirror() {
603 return SystemDictionary::Object_klass()->java_mirror();
604 }
605
606 oop MethodHandles::field_name_or_null(Symbol* s) {
607 if (s == NULL) return NULL;
608 return StringTable::lookup(s);
609 }
610
611 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
612 if (s == NULL) return NULL;
613 BasicType bt = FieldType::basic_type(s);
614 if (is_java_primitive(bt)) {
615 assert(s->utf8_length() == 1, "");
616 return java_lang_Class::primitive_mirror(bt);
617 }
618 // Here are some more short cuts for common types.
619 // They are optional, since reference types can be resolved lazily.
620 if (bt == T_OBJECT) {
621 if (s == vmSymbols::object_signature()) {
622 return object_java_mirror();
623 } else if (s == vmSymbols::class_signature()) {
624 return SystemDictionary::Class_klass()->java_mirror();
625 } else if (s == vmSymbols::string_signature()) {
626 return SystemDictionary::String_klass()->java_mirror();
627 }
628 }
629 return NULL;
630 }
631
632
633 // An unresolved member name is a mere symbolic reference.
634 // Resolving it plants a vmtarget/vmindex in it,
635 // which refers directly to JVM internals.
636 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, TRAPS) {
637 Handle empty;
638 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
639
640 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
641 // Already resolved.
642 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
643 assert(vmindex >= Method::nonvirtual_vtable_index, "");
644 return mname;
645 }
646
647 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
648 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
649 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
650 int flags = java_lang_invoke_MemberName::flags(mname());
651 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
652 if (!ref_kind_is_valid(ref_kind)) {
653 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
654 }
655
656 DEBUG_ONLY(int old_vmindex);
657 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
658
659 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
660 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
661 }
662
663 InstanceKlass* defc = NULL;
664 {
665 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
666 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
667 if (!defc_klass->is_instance_klass()) {
668 if (!defc_klass->is_array_klass()) return empty;
669 defc_klass = SystemDictionary::Object_klass();
670 }
671 defc = InstanceKlass::cast(defc_klass);
672 }
673 if (defc == NULL) {
674 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
675 }
676 defc->link_class(CHECK_(empty)); // possible safepoint
677
678 // convert the external string name to an internal symbol
679 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
680 if (name == NULL) return empty; // no such name
681 if (name == vmSymbols::class_initializer_name())
682 return empty; // illegal name
683
684 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
685 if ((flags & ALL_KINDS) == IS_METHOD &&
686 (defc == SystemDictionary::MethodHandle_klass()) &&
687 (ref_kind == JVM_REF_invokeVirtual ||
688 ref_kind == JVM_REF_invokeSpecial ||
689 // static invocation mode is required for _linkToVirtual, etc.:
690 ref_kind == JVM_REF_invokeStatic)) {
691 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
692 if (iid != vmIntrinsics::_none &&
693 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
694 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
695 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
696 mh_invoke_id = iid;
697 }
698 }
699
700 // convert the external string or reflective type to an internal signature
701 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
702 if (type == NULL) return empty; // no such signature exists in the VM
703
704 LinkInfo::AccessCheck access_check = caller != NULL ?
705 LinkInfo::needs_access_check :
706 LinkInfo::skip_access_check;
707
708 // Time to do the lookup.
709 switch (flags & ALL_KINDS) {
710 case IS_METHOD:
711 {
712 CallInfo result;
713 LinkInfo link_info(defc, name, type, caller, access_check);
714 {
715 assert(!HAS_PENDING_EXCEPTION, "");
716 if (ref_kind == JVM_REF_invokeStatic) {
717 LinkResolver::resolve_static_call(result,
718 link_info, false, THREAD);
719 } else if (ref_kind == JVM_REF_invokeInterface) {
720 LinkResolver::resolve_interface_call(result, Handle(), defc,
721 link_info, false, THREAD);
722 } else if (mh_invoke_id != vmIntrinsics::_none) {
723 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
724 LinkResolver::resolve_handle_call(result, link_info, THREAD);
725 } else if (ref_kind == JVM_REF_invokeSpecial) {
726 LinkResolver::resolve_special_call(result, Handle(),
727 link_info, THREAD);
728 } else if (ref_kind == JVM_REF_invokeVirtual) {
729 LinkResolver::resolve_virtual_call(result, Handle(), defc,
730 link_info, false, THREAD);
731 } else {
732 assert(false, "ref_kind=%d", ref_kind);
733 }
734 if (HAS_PENDING_EXCEPTION) {
735 return empty;
736 }
737 }
738 if (result.resolved_appendix().not_null()) {
739 // The resolved MemberName must not be accompanied by an appendix argument,
740 // since there is no way to bind this value into the MemberName.
741 // Caller is responsible to prevent this from happening.
742 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
743 }
744 result.set_resolved_method_name(CHECK_(empty));
745 oop mname2 = init_method_MemberName(mname, result);
746 return Handle(THREAD, mname2);
747 }
748 case IS_CONSTRUCTOR:
749 {
750 CallInfo result;
751 LinkInfo link_info(defc, name, type, caller, access_check);
752 {
753 assert(!HAS_PENDING_EXCEPTION, "");
754 if (name == vmSymbols::object_initializer_name()) {
755 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
756 } else {
757 break; // will throw after end of switch
758 }
759 if (HAS_PENDING_EXCEPTION) {
760 return empty;
761 }
762 }
763 assert(result.is_statically_bound(), "");
764 result.set_resolved_method_name(CHECK_(empty));
765 oop mname2 = init_method_MemberName(mname, result);
766 return Handle(THREAD, mname2);
767 }
768 case IS_FIELD:
769 {
770 fieldDescriptor result; // find_field initializes fd if found
771 {
772 assert(!HAS_PENDING_EXCEPTION, "");
773 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
774 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
775 if (HAS_PENDING_EXCEPTION) {
776 return empty;
777 }
778 }
779 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
780 return Handle(THREAD, mname2);
781 }
782 default:
783 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
784 }
785
786 return empty;
787 }
788
789 // Conversely, a member name which is only initialized from JVM internals
790 // may have null defc, name, and type fields.
791 // Resolving it plants a vmtarget/vmindex in it,
792 // which refers directly to JVM internals.
793 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
794 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
795
796 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
797 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
798 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
799 int flags = java_lang_invoke_MemberName::flags(mname());
800
801 if (suppress != 0) {
802 if (suppress & _suppress_defc) have_defc = true;
803 if (suppress & _suppress_name) have_name = true;
804 if (suppress & _suppress_type) have_type = true;
805 }
806
807 if (have_defc && have_name && have_type) return; // nothing needed
808
809 switch (flags & ALL_KINDS) {
810 case IS_METHOD:
811 case IS_CONSTRUCTOR:
812 {
813 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
814 if (vmtarget == NULL) {
815 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
816 }
817 methodHandle m(THREAD, vmtarget);
818 DEBUG_ONLY(vmtarget = NULL); // safety
819 if (!have_defc) {
820 InstanceKlass* defc = m->method_holder();
821 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
822 }
823 if (!have_name) {
824 //not java_lang_String::create_from_symbol; let's intern member names
825 oop name = StringTable::intern(m->name(), CHECK);
826 java_lang_invoke_MemberName::set_name(mname(), name);
827 }
828 if (!have_type) {
829 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
830 java_lang_invoke_MemberName::set_type(mname(), type());
831 }
832 return;
833 }
834 case IS_FIELD:
835 {
836 oop clazz = java_lang_invoke_MemberName::clazz(mname());
837 if (clazz == NULL) {
838 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
839 }
840 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
841 DEBUG_ONLY(clazz = NULL); // safety
842 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
843 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
844 fieldDescriptor fd; // find_field initializes fd if found
845 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
846 break; // cannot expand
847 if (!have_name) {
848 //not java_lang_String::create_from_symbol; let's intern member names
849 oop name = StringTable::intern(fd.name(), CHECK);
850 java_lang_invoke_MemberName::set_name(mname(), name);
851 }
852 if (!have_type) {
853 // If it is a primitive field type, don't mess with short strings like "I".
854 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
855 if (type.is_null()) {
856 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
857 }
858 java_lang_invoke_MemberName::set_type(mname(), type());
859 }
860 return;
861 }
862 }
863 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
864 }
865
866 int MethodHandles::find_MemberNames(Klass* k,
867 Symbol* name, Symbol* sig,
868 int mflags, Klass* caller,
869 int skip, objArrayHandle results, TRAPS) {
870 // %%% take caller into account!
871
872 Thread* thread = Thread::current();
873
874 if (k == NULL || !k->is_instance_klass()) return -1;
875
876 int rfill = 0, rlimit = results->length(), rskip = skip;
877 // overflow measurement:
878 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
879
880 int match_flags = mflags;
881 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
882 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
883 bool local_only = !(search_superc | search_intfc);
884 bool classes_only = false;
885
886 if (name != NULL) {
887 if (name->utf8_length() == 0) return 0; // a match is not possible
888 }
889 if (sig != NULL) {
890 if (sig->utf8_length() == 0) return 0; // a match is not possible
891 if (sig->byte_at(0) == '(')
892 match_flags &= ~(IS_FIELD | IS_TYPE);
893 else
894 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
895 }
896
897 if ((match_flags & IS_TYPE) != 0) {
898 // NYI, and Core Reflection works quite well for this query
899 }
900
901 if ((match_flags & IS_FIELD) != 0) {
902 InstanceKlass* ik = InstanceKlass::cast(k);
903 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
904 if (name != NULL && st.name() != name)
905 continue;
906 if (sig != NULL && st.signature() != sig)
907 continue;
908 // passed the filters
909 if (rskip > 0) {
910 --rskip;
911 } else if (rfill < rlimit) {
912 Handle result(thread, results->obj_at(rfill++));
913 if (!java_lang_invoke_MemberName::is_instance(result()))
914 return -99; // caller bug!
915 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
916 if (saved != result())
917 results->obj_at_put(rfill-1, saved); // show saved instance to user
918 } else if (++overflow >= overflow_limit) {
919 match_flags = 0; break; // got tired of looking at overflow
920 }
921 }
922 }
923
924 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
925 // watch out for these guys:
926 Symbol* init_name = vmSymbols::object_initializer_name();
927 Symbol* clinit_name = vmSymbols::class_initializer_name();
928 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
929 bool negate_name_test = false;
930 // fix name so that it captures the intention of IS_CONSTRUCTOR
931 if (!(match_flags & IS_METHOD)) {
932 // constructors only
933 if (name == NULL) {
934 name = init_name;
935 } else if (name != init_name) {
936 return 0; // no constructors of this method name
937 }
938 } else if (!(match_flags & IS_CONSTRUCTOR)) {
939 // methods only
940 if (name == NULL) {
941 name = init_name;
942 negate_name_test = true; // if we see the name, we *omit* the entry
943 } else if (name == init_name) {
944 return 0; // no methods of this constructor name
945 }
946 } else {
947 // caller will accept either sort; no need to adjust name
948 }
949 InstanceKlass* ik = InstanceKlass::cast(k);
950 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
951 Method* m = st.method();
952 Symbol* m_name = m->name();
953 if (m_name == clinit_name)
954 continue;
955 if (name != NULL && ((m_name != name) ^ negate_name_test))
956 continue;
957 if (sig != NULL && m->signature() != sig)
958 continue;
959 // passed the filters
960 if (rskip > 0) {
961 --rskip;
962 } else if (rfill < rlimit) {
963 Handle result(thread, results->obj_at(rfill++));
964 if (!java_lang_invoke_MemberName::is_instance(result()))
965 return -99; // caller bug!
966 CallInfo info(m, NULL, CHECK_0);
967 oop saved = MethodHandles::init_method_MemberName(result, info);
968 if (saved != result())
969 results->obj_at_put(rfill-1, saved); // show saved instance to user
970 } else if (++overflow >= overflow_limit) {
971 match_flags = 0; break; // got tired of looking at overflow
972 }
973 }
974 }
975
976 // return number of elements we at leasted wanted to initialize
977 return rfill + overflow;
978 }
979
980 // Is it safe to remove stale entries from a dependency list?
981 static bool safe_to_expunge() {
982 // Since parallel GC threads can concurrently iterate over a dependency
983 // list during safepoint, it is safe to remove entries only when
984 // CodeCache lock is held.
985 return CodeCache_lock->owned_by_self();
986 }
987
988 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
989 assert_locked_or_safepoint(CodeCache_lock);
990
991 oop context = java_lang_invoke_CallSite::context(call_site);
992 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
993 // Try to purge stale entries on updates.
994 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
995 // in order to avoid memory leak, stale entries are purged whenever a dependency list
996 // is changed (both on addition and removal). Though memory reclamation is delayed,
997 // it avoids indefinite memory usage growth.
998 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
999 }
1000
1001 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
1002 assert_locked_or_safepoint(CodeCache_lock);
1003
1004 oop context = java_lang_invoke_CallSite::context(call_site);
1005 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1006 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
1007 }
1008
1009 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
1010 assert_lock_strong(Compile_lock);
1011
1012 int marked = 0;
1013 CallSiteDepChange changes(call_site, target);
1014 {
1015 NoSafepointVerifier nsv;
1016 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1017
1018 oop context = java_lang_invoke_CallSite::context(call_site());
1019 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1020 marked = deps.mark_dependent_nmethods(changes);
1021 }
1022 if (marked > 0) {
1023 // At least one nmethod has been marked for deoptimization.
1024 VM_Deoptimize op;
1025 VMThread::execute(&op);
1026 }
1027 }
1028
1029 //
1030 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1031 // They are the private interface between this JVM and the HotSpot-specific
1032 // Java code that implements JSR 292 method handles.
1033 //
1034 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1035 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1036 //
1037
1038 #ifndef PRODUCT
1039 #define EACH_NAMED_CON(template, requirement) \
1040 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1041 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1042 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1043 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1044 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1045 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1046 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1047 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1048 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1049 /*end*/
1050
1051 #define IGNORE_REQ(req_expr) /* req_expr */
1052 #define ONE_PLUS(scope,value) 1+
1053 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1054 #define VALUE_COMMA(scope,value) scope::value,
1055 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1056 #define STRING_NULL(scope,value) #value "\0"
1057 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1058
1059 static bool advertise_con_value(int which) {
1060 if (which < 0) return false;
1061 bool ok = true;
1062 int count = 0;
1063 #define INC_COUNT(scope,value) \
1064 ++count;
1065 #define CHECK_REQ(req_expr) \
1066 if (which < count) return ok; \
1067 ok = (req_expr);
1068 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1069 #undef INC_COUNT
1070 #undef CHECK_REQ
1071 assert(count == con_value_count, "");
1072 if (which < count) return ok;
1073 return false;
1074 }
1075
1076 #undef ONE_PLUS
1077 #undef VALUE_COMMA
1078 #undef STRING_NULL
1079 #undef EACH_NAMED_CON
1080 #endif // PRODUCT
1081
1082 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1083 #ifndef PRODUCT
1084 if (advertise_con_value(which)) {
1085 assert(which >= 0 && which < con_value_count, "");
1086 int con = con_values[which];
1087 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1088 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1089 const char* str = &con_names[0];
1090 for (int i = 0; i < which; i++)
1091 str += strlen(str) + 1; // skip name and null
1092 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1093 box->obj_at_put(0, name);
1094 }
1095 return con;
1096 }
1097 #endif
1098 return 0;
1099 }
1100 JVM_END
1101
1102 // void init(MemberName self, AccessibleObject ref)
1103 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1104 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1105 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1106 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1107 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1108 MethodHandles::init_MemberName(mname, target, CHECK);
1109 }
1110 JVM_END
1111
1112 // void expand(MemberName self)
1113 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1114 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1115 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1116 MethodHandles::expand_MemberName(mname, 0, CHECK);
1117 }
1118 JVM_END
1119
1120 // void resolve(MemberName self, Class<?> caller)
1121 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1122 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1123 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1124
1125 // The trusted Java code that calls this method should already have performed
1126 // access checks on behalf of the given caller. But, we can verify this.
1127 if (VerifyMethodHandles && caller_jh != NULL &&
1128 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1129 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1130 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1131 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1132 }
1133
1134 // Reflection::verify_class_access can only handle instance classes.
1135 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1136 // Emulate LinkResolver::check_klass_accessability.
1137 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1138 if (caller != SystemDictionary::Object_klass()
1139 && Reflection::verify_class_access(caller,
1140 InstanceKlass::cast(reference_klass),
1141 true) != Reflection::ACCESS_OK) {
1142 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1143 }
1144 }
1145 }
1146
1147 Klass* caller = caller_jh == NULL ? NULL :
1148 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1149 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1150
1151 if (resolved.is_null()) {
1152 int flags = java_lang_invoke_MemberName::flags(mname());
1153 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1154 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1155 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1156 }
1157 if ((flags & ALL_KINDS) == IS_FIELD) {
1158 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed");
1159 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1160 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1161 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed");
1162 } else {
1163 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1164 }
1165 }
1166
1167 return JNIHandles::make_local(THREAD, resolved());
1168 }
1169 JVM_END
1170
1171 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1172 if (mname == NULL ||
1173 java_lang_invoke_MemberName::clazz(mname) == NULL) {
1174 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1175 } else {
1176 int flags = java_lang_invoke_MemberName::flags(mname);
1177 if ((flags & IS_FIELD) != 0 &&
1178 (must_be_static
1179 ? (flags & JVM_ACC_STATIC) != 0
1180 : (flags & JVM_ACC_STATIC) == 0)) {
1181 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1182 return (jlong) vmindex;
1183 }
1184 }
1185 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1186 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1187 return 0;
1188 }
1189
1190 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1191 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1192 }
1193 JVM_END
1194
1195 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1196 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1197 }
1198 JVM_END
1199
1200 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1201 // use the other function to perform sanity checks:
1202 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1203 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1204 return JNIHandles::make_local(THREAD, clazz);
1205 }
1206 JVM_END
1207
1208 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1209 if (mname_jh == NULL) return NULL;
1210 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1211 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1212 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1213 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1214 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1215 result->obj_at_put(0, x);
1216
1217 int flags = java_lang_invoke_MemberName::flags(mname());
1218 if ((flags & IS_FIELD) != 0) {
1219 x = java_lang_invoke_MemberName::clazz(mname());
1220 } else {
1221 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1222 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1223 x = mname();
1224 }
1225 result->obj_at_put(1, x);
1226 return JNIHandles::make_local(env, result());
1227 }
1228 JVM_END
1229
1230
1231
1232 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1233 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1234 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1235 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1236 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1237 if (clazz_jh == NULL || results_jh == NULL) return -1;
1238 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1239
1240 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1241 if (results.is_null() || !results->is_objArray()) return -1;
1242
1243 TempNewSymbol name = NULL;
1244 TempNewSymbol sig = NULL;
1245 if (name_jh != NULL) {
1246 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1247 if (name == NULL) return 0; // a match is not possible
1248 }
1249 if (sig_jh != NULL) {
1250 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1251 if (sig == NULL) return 0; // a match is not possible
1252 }
1253
1254 Klass* caller = NULL;
1255 if (caller_jh != NULL) {
1256 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1257 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1258 caller = java_lang_Class::as_Klass(caller_oop);
1259 }
1260
1261 if (name != NULL && sig != NULL && results.not_null()) {
1262 // try a direct resolve
1263 // %%% TO DO
1264 }
1265
1266 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1267 caller, skip, results, CHECK_0);
1268 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1269 return res;
1270 }
1271 JVM_END
1272
1273 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1274 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1275 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1276 {
1277 // Walk all nmethods depending on this call site.
1278 MutexLocker mu(Compile_lock, thread);
1279 MethodHandles::flush_dependent_nmethods(call_site, target);
1280 java_lang_invoke_CallSite::set_target(call_site(), target());
1281 }
1282 }
1283 JVM_END
1284
1285 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1286 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1287 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1288 {
1289 // Walk all nmethods depending on this call site.
1290 MutexLocker mu(Compile_lock, thread);
1291 MethodHandles::flush_dependent_nmethods(call_site, target);
1292 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1293 }
1294 }
1295 JVM_END
1296
1297 // It is called by a Cleaner object which ensures that dropped CallSites properly
1298 // deallocate their dependency information.
1299 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1300 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1301 {
1302 // Walk all nmethods depending on this call site.
1303 MutexLocker mu1(Compile_lock, thread);
1304
1305 int marked = 0;
1306 {
1307 NoSafepointVerifier nsv;
1308 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1309 assert(safe_to_expunge(), "removal is not safe");
1310 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1311 marked = deps.remove_all_dependents();
1312 }
1313 if (marked > 0) {
1314 // At least one nmethod has been marked for deoptimization
1315 VM_Deoptimize op;
1316 VMThread::execute(&op);
1317 }
1318 }
1319 }
1320 JVM_END
1321
1322 /**
1323 * Throws a java/lang/UnsupportedOperationException unconditionally.
1324 * This is required by the specification of MethodHandle.invoke if
1325 * invoked directly.
1326 */
1327 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1328 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1329 return NULL;
1330 }
1331 JVM_END
1332
1333 /**
1334 * Throws a java/lang/UnsupportedOperationException unconditionally.
1335 * This is required by the specification of MethodHandle.invokeExact if
1336 * invoked directly.
1337 */
1338 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1339 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1340 return NULL;
1341 }
1342 JVM_END
1343
1344 /// JVM_RegisterMethodHandleMethods
1345
1346 #undef CS // Solaris builds complain
1347
1348 #define LANG "Ljava/lang/"
1349 #define JLINV "Ljava/lang/invoke/"
1350
1351 #define OBJ LANG "Object;"
1352 #define CLS LANG "Class;"
1353 #define STRG LANG "String;"
1354 #define CS JLINV "CallSite;"
1355 #define MT JLINV "MethodType;"
1356 #define MH JLINV "MethodHandle;"
1357 #define MEM JLINV "MemberName;"
1358 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1359
1360 #define CC (char*) /*cast a literal from (const char*)*/
1361 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1362
1363 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1364 static JNINativeMethod MHN_methods[] = {
1365 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1366 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1367 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)},
1368 // static native int getNamedCon(int which, Object[] name)
1369 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1370 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1371 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1372 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1373 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1374 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1375 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1376 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1377 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1378 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1379 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1380 };
1381
1382 static JNINativeMethod MH_methods[] = {
1383 // UnsupportedOperationException throwers
1384 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1385 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1386 };
1387
1388 /**
1389 * This one function is exported, used by NativeLookup.
1390 */
1391 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1392 assert(!MethodHandles::enabled(), "must not be enabled");
1393 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1394
1395 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1396 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1397
1398 {
1399 ThreadToNativeFromVM ttnfv(thread);
1400
1401 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1402 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1403 "register java.lang.invoke.MethodHandleNative natives");
1404
1405 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1406 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1407 "register java.lang.invoke.MethodHandle natives");
1408 }
1409
1410 if (TraceInvokeDynamic) {
1411 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1412 }
1413
1414 MethodHandles::set_enabled(true);
1415 }
1416 JVM_END