Mercurial > hg > truffle
annotate src/share/vm/prims/methodHandles.cpp @ 1397:b4776199210f
6943485: JVMTI always on capabilities change code generation too much
Reviewed-by: twisti, dcubed
author | never |
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date | Mon, 26 Apr 2010 23:59:45 -0700 |
parents | 9eba43136cb5 |
children | cd5dbf694d45 |
rev | line source |
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710 | 1 /* |
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2 * Copyright 2008-2010 Sun Microsystems, Inc. All Rights Reserved. |
710 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 /* | |
26 * JSR 292 reference implementation: method handles | |
27 */ | |
28 | |
29 #include "incls/_precompiled.incl" | |
30 #include "incls/_methodHandles.cpp.incl" | |
31 | |
32 bool MethodHandles::_enabled = false; // set true after successful native linkage | |
33 | |
34 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL}; | |
35 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = { | |
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36 "raise_exception", |
710 | 37 "invokestatic", // how a MH emulates invokestatic |
38 "invokespecial", // ditto for the other invokes... | |
39 "invokevirtual", | |
40 "invokeinterface", | |
41 "bound_ref", // these are for BMH... | |
42 "bound_int", | |
43 "bound_long", | |
44 "bound_ref_direct", // (direct versions have a direct methodOop) | |
45 "bound_int_direct", | |
46 "bound_long_direct", | |
47 | |
48 // starting at _adapter_mh_first: | |
49 "adapter_retype_only", // these are for AMH... | |
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50 "adapter_retype_raw", |
710 | 51 "adapter_check_cast", |
52 "adapter_prim_to_prim", | |
53 "adapter_ref_to_prim", | |
54 "adapter_prim_to_ref", | |
55 "adapter_swap_args", | |
56 "adapter_rot_args", | |
57 "adapter_dup_args", | |
58 "adapter_drop_args", | |
59 "adapter_collect_args", | |
60 "adapter_spread_args", | |
61 "adapter_flyby", | |
62 "adapter_ricochet", | |
63 | |
64 // optimized adapter types: | |
65 "adapter_swap_args/1", | |
66 "adapter_swap_args/2", | |
67 "adapter_rot_args/1,up", | |
68 "adapter_rot_args/1,down", | |
69 "adapter_rot_args/2,up", | |
70 "adapter_rot_args/2,down", | |
71 "adapter_prim_to_prim/i2i", | |
72 "adapter_prim_to_prim/l2i", | |
73 "adapter_prim_to_prim/d2f", | |
74 "adapter_prim_to_prim/i2l", | |
75 "adapter_prim_to_prim/f2d", | |
76 "adapter_ref_to_prim/unboxi", | |
77 "adapter_ref_to_prim/unboxl", | |
78 "adapter_spread_args/0", | |
79 "adapter_spread_args/1", | |
80 "adapter_spread_args/more", | |
81 | |
82 NULL | |
83 }; | |
84 | |
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85 // Adapters. |
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86 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; |
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87 int MethodHandles::_adapter_code_size = StubRoutines::method_handles_adapters_code_size; |
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88 |
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89 jobject MethodHandles::_raise_exception_method; |
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90 |
710 | 91 #ifdef ASSERT |
92 bool MethodHandles::spot_check_entry_names() { | |
93 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), ""); | |
94 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), ""); | |
95 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), ""); | |
96 assert(!strcmp(entry_name(_adapter_ricochet), "adapter_ricochet"), ""); | |
97 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), ""); | |
98 return true; | |
99 } | |
100 #endif | |
101 | |
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102 |
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103 //------------------------------------------------------------------------------ |
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104 // MethodHandles::generate_adapters |
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105 // |
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106 void MethodHandles::generate_adapters() { |
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107 if (!EnableMethodHandles || SystemDictionary::MethodHandle_klass() == NULL) return; |
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108 |
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109 assert(_adapter_code == NULL, "generate only once"); |
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110 |
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111 ResourceMark rm; |
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112 TraceTime timer("MethodHandles adapters generation", TraceStartupTime); |
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113 _adapter_code = MethodHandlesAdapterBlob::create(_adapter_code_size); |
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114 if (_adapter_code == NULL) |
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115 vm_exit_out_of_memory(_adapter_code_size, "CodeCache: no room for MethodHandles adapters"); |
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116 CodeBuffer code(_adapter_code->instructions_begin(), _adapter_code->instructions_size()); |
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117 |
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118 MethodHandlesAdapterGenerator g(&code); |
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119 g.generate(); |
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120 } |
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121 |
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122 |
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123 //------------------------------------------------------------------------------ |
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124 // MethodHandlesAdapterGenerator::generate |
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125 // |
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126 void MethodHandlesAdapterGenerator::generate() { |
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127 // Generate generic method handle adapters. |
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128 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST; |
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129 ek < MethodHandles::_EK_LIMIT; |
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130 ek = MethodHandles::EntryKind(1 + (int)ek)) { |
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131 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek)); |
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132 MethodHandles::generate_method_handle_stub(_masm, ek); |
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133 } |
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134 } |
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135 |
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136 |
710 | 137 void MethodHandles::set_enabled(bool z) { |
138 if (_enabled != z) { | |
139 guarantee(z && EnableMethodHandles, "can only enable once, and only if -XX:+EnableMethodHandles"); | |
140 _enabled = z; | |
141 } | |
142 } | |
143 | |
144 // Note: A method which does not have a TRAPS argument cannot block in the GC | |
145 // or throw exceptions. Such methods are used in this file to do something quick | |
146 // and local, like parse a data structure. For speed, such methods work on plain | |
147 // oops, not handles. Trapping methods uniformly operate on handles. | |
148 | |
149 methodOop MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype, | |
150 klassOop& receiver_limit_result, int& decode_flags_result) { | |
151 if (vmtarget == NULL) return NULL; | |
152 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding"); | |
153 if (vmindex < 0) { | |
154 // this DMH performs no dispatch; it is directly bound to a methodOop | |
155 // A MemberName may either be directly bound to a methodOop, | |
156 // or it may use the klass/index form; both forms mean the same thing. | |
157 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result); | |
158 if ((decode_flags_result & _dmf_has_receiver) != 0 | |
159 && java_dyn_MethodType::is_instance(mtype)) { | |
160 // Extract receiver type restriction from mtype.ptypes[0]. | |
161 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype); | |
162 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0); | |
163 if (java_lang_Class::is_instance(ptype0)) | |
164 receiver_limit_result = java_lang_Class::as_klassOop(ptype0); | |
165 } | |
166 if (vmindex == methodOopDesc::nonvirtual_vtable_index) { | |
167 // this DMH can be an "invokespecial" version | |
168 decode_flags_result &= ~_dmf_does_dispatch; | |
169 } else { | |
170 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?"); | |
171 } | |
172 return m; | |
173 } else { | |
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174 assert(vmtarget->is_klass(), "must be class or interface"); |
710 | 175 decode_flags_result |= MethodHandles::_dmf_does_dispatch; |
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176 decode_flags_result |= MethodHandles::_dmf_has_receiver; |
710 | 177 receiver_limit_result = (klassOop)vmtarget; |
178 Klass* tk = Klass::cast((klassOop)vmtarget); | |
179 if (tk->is_interface()) { | |
180 // an itable linkage is <interface, itable index> | |
181 decode_flags_result |= MethodHandles::_dmf_from_interface; | |
182 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex); | |
183 } else { | |
184 if (!tk->oop_is_instance()) | |
1142 | 185 tk = instanceKlass::cast(SystemDictionary::Object_klass()); |
710 | 186 return ((instanceKlass*)tk)->method_at_vtable(vmindex); |
187 } | |
188 } | |
189 } | |
190 | |
191 // MemberName and DirectMethodHandle have the same linkage to the JVM internals. | |
192 // (MemberName is the non-operational name used for queries and setup.) | |
193 | |
194 methodOop MethodHandles::decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
195 oop vmtarget = sun_dyn_DirectMethodHandle::vmtarget(mh); | |
196 int vmindex = sun_dyn_DirectMethodHandle::vmindex(mh); | |
197 oop mtype = sun_dyn_DirectMethodHandle::type(mh); | |
198 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result); | |
199 } | |
200 | |
201 methodOop MethodHandles::decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
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202 assert(sun_dyn_BoundMethodHandle::is_instance(mh), ""); |
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203 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), ""); |
710 | 204 for (oop bmh = mh;;) { |
205 // Bound MHs can be stacked to bind several arguments. | |
206 oop target = java_dyn_MethodHandle::vmtarget(bmh); | |
207 if (target == NULL) return NULL; | |
208 decode_flags_result |= MethodHandles::_dmf_binds_argument; | |
209 klassOop tk = target->klass(); | |
210 if (tk == SystemDictionary::BoundMethodHandle_klass()) { | |
211 bmh = target; | |
212 continue; | |
213 } else { | |
214 if (java_dyn_MethodHandle::is_subclass(tk)) { | |
215 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH"); | |
216 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result); | |
217 } else { | |
218 // Optimized case: binding a receiver to a non-dispatched DMH | |
219 // short-circuits directly to the methodOop. | |
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220 // (It might be another argument besides a receiver also.) |
710 | 221 assert(target->is_method(), "must be a simple method"); |
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222 decode_flags_result |= MethodHandles::_dmf_binds_method; |
710 | 223 methodOop m = (methodOop) target; |
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224 if (!m->is_static()) |
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225 decode_flags_result |= MethodHandles::_dmf_has_receiver; |
710 | 226 return m; |
227 } | |
228 } | |
229 } | |
230 } | |
231 | |
232 methodOop MethodHandles::decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
233 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), ""); | |
234 for (oop amh = mh;;) { | |
235 // Adapter MHs can be stacked to convert several arguments. | |
236 int conv_op = adapter_conversion_op(sun_dyn_AdapterMethodHandle::conversion(amh)); | |
237 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK; | |
238 oop target = java_dyn_MethodHandle::vmtarget(amh); | |
239 if (target == NULL) return NULL; | |
240 klassOop tk = target->klass(); | |
241 if (tk == SystemDictionary::AdapterMethodHandle_klass()) { | |
242 amh = target; | |
243 continue; | |
244 } else { | |
245 // must be a BMH (which will bind some more arguments) or a DMH (for the final call) | |
246 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result); | |
247 } | |
248 } | |
249 } | |
250 | |
251 methodOop MethodHandles::decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
252 if (mh == NULL) return NULL; | |
253 klassOop mhk = mh->klass(); | |
254 assert(java_dyn_MethodHandle::is_subclass(mhk), "must be a MethodHandle"); | |
255 if (mhk == SystemDictionary::DirectMethodHandle_klass()) { | |
256 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
257 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) { | |
258 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
259 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) { | |
260 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
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261 } else if (sun_dyn_BoundMethodHandle::is_subclass(mhk)) { |
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262 // could be a JavaMethodHandle (but not an adapter MH) |
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263 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); |
710 | 264 } else { |
265 assert(false, "cannot parse this MH"); | |
266 return NULL; // random MH? | |
267 } | |
268 } | |
269 | |
270 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) { | |
271 assert(m->is_method(), ""); | |
272 if (m->is_static()) { | |
273 // check that signature begins '(L' or '([' (not '(I', '()', etc.) | |
274 symbolOop sig = m->signature(); | |
275 BasicType recv_bt = char2type(sig->byte_at(1)); | |
276 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')' | |
277 assert(sig->byte_at(0) == '(', "must be method sig"); | |
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278 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY) |
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279 // decode_flags_result |= _dmf_has_receiver; |
710 | 280 } else { |
281 // non-static method | |
282 decode_flags_result |= _dmf_has_receiver; | |
283 if (!m->can_be_statically_bound() && !m->is_initializer()) { | |
284 decode_flags_result |= _dmf_does_dispatch; | |
285 if (Klass::cast(m->method_holder())->is_interface()) | |
286 decode_flags_result |= _dmf_from_interface; | |
287 } | |
288 } | |
289 return m; | |
290 } | |
291 | |
292 | |
293 // A trusted party is handing us a cookie to determine a method. | |
294 // Let's boil it down to the method oop they really want. | |
295 methodOop MethodHandles::decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result) { | |
296 decode_flags_result = 0; | |
297 receiver_limit_result = NULL; | |
298 klassOop xk = x->klass(); | |
299 if (xk == Universe::methodKlassObj()) { | |
300 return decode_methodOop((methodOop) x, decode_flags_result); | |
301 } else if (xk == SystemDictionary::MemberName_klass()) { | |
302 // Note: This only works if the MemberName has already been resolved. | |
303 return decode_MemberName(x, receiver_limit_result, decode_flags_result); | |
304 } else if (java_dyn_MethodHandle::is_subclass(xk)) { | |
305 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result); | |
1142 | 306 } else if (xk == SystemDictionary::reflect_Method_klass()) { |
710 | 307 oop clazz = java_lang_reflect_Method::clazz(x); |
308 int slot = java_lang_reflect_Method::slot(x); | |
309 klassOop k = java_lang_Class::as_klassOop(clazz); | |
310 if (k != NULL && Klass::cast(k)->oop_is_instance()) | |
311 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), | |
312 decode_flags_result); | |
1142 | 313 } else if (xk == SystemDictionary::reflect_Constructor_klass()) { |
710 | 314 oop clazz = java_lang_reflect_Constructor::clazz(x); |
315 int slot = java_lang_reflect_Constructor::slot(x); | |
316 klassOop k = java_lang_Class::as_klassOop(clazz); | |
317 if (k != NULL && Klass::cast(k)->oop_is_instance()) | |
318 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), | |
319 decode_flags_result); | |
320 } else { | |
321 // unrecognized object | |
322 assert(!x->is_method(), "already checked"); | |
323 assert(!sun_dyn_MemberName::is_instance(x), "already checked"); | |
324 } | |
325 return NULL; | |
326 } | |
327 | |
328 | |
329 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) { | |
330 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass()) | |
331 return 0; // no push/pop | |
332 int this_vmslots = java_dyn_MethodHandle::vmslots(mh); | |
333 int last_vmslots = 0; | |
334 oop last_mh = mh; | |
335 for (;;) { | |
336 oop target = java_dyn_MethodHandle::vmtarget(last_mh); | |
337 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { | |
338 last_vmslots = java_dyn_MethodHandle::vmslots(target); | |
339 break; | |
340 } else if (!java_dyn_MethodHandle::is_instance(target)) { | |
341 // might be klass or method | |
342 assert(target->is_method(), "must get here with a direct ref to method"); | |
343 last_vmslots = methodOop(target)->size_of_parameters(); | |
344 break; | |
345 } | |
346 last_mh = target; | |
347 } | |
348 // If I am called with fewer VM slots than my ultimate callee, | |
349 // it must be that I push the additionally needed slots. | |
350 // Likewise if am called with more VM slots, I will pop them. | |
351 return (last_vmslots - this_vmslots); | |
352 } | |
353 | |
354 | |
355 // MemberName support | |
356 | |
357 // import sun_dyn_MemberName.* | |
358 enum { | |
359 IS_METHOD = sun_dyn_MemberName::MN_IS_METHOD, | |
360 IS_CONSTRUCTOR = sun_dyn_MemberName::MN_IS_CONSTRUCTOR, | |
361 IS_FIELD = sun_dyn_MemberName::MN_IS_FIELD, | |
362 IS_TYPE = sun_dyn_MemberName::MN_IS_TYPE, | |
363 SEARCH_SUPERCLASSES = sun_dyn_MemberName::MN_SEARCH_SUPERCLASSES, | |
364 SEARCH_INTERFACES = sun_dyn_MemberName::MN_SEARCH_INTERFACES, | |
365 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE, | |
366 VM_INDEX_UNINITIALIZED = sun_dyn_MemberName::VM_INDEX_UNINITIALIZED | |
367 }; | |
368 | |
369 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) { | |
1142 | 370 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) { |
710 | 371 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() |
372 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() | |
373 int mods = java_lang_reflect_Field::modifiers(target_oop); | |
374 klassOop k = java_lang_Class::as_klassOop(clazz); | |
375 int offset = instanceKlass::cast(k)->offset_from_fields(slot); | |
376 init_MemberName(mname_oop, k, accessFlags_from(mods), offset); | |
377 } else { | |
378 int decode_flags = 0; klassOop receiver_limit = NULL; | |
379 methodOop m = MethodHandles::decode_method(target_oop, | |
380 receiver_limit, decode_flags); | |
381 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); | |
382 init_MemberName(mname_oop, m, do_dispatch); | |
383 } | |
384 } | |
385 | |
386 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) { | |
387 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD) | |
388 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS )); | |
389 oop vmtarget = m; | |
390 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet | |
391 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound()) | |
392 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch | |
393 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value"); | |
394 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); | |
395 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); | |
396 sun_dyn_MemberName::set_flags(mname_oop, flags); | |
397 } | |
398 | |
399 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) { | |
400 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS )); | |
401 oop vmtarget = field_holder; | |
402 int vmindex = offset; // implies no info yet | |
403 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex"); | |
404 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); | |
405 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); | |
406 sun_dyn_MemberName::set_flags(mname_oop, flags); | |
407 } | |
408 | |
409 | |
410 methodOop MethodHandles::decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result) { | |
411 int flags = sun_dyn_MemberName::flags(mname); | |
412 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return NULL; // not invocable | |
413 oop vmtarget = sun_dyn_MemberName::vmtarget(mname); | |
414 int vmindex = sun_dyn_MemberName::vmindex(mname); | |
415 if (vmindex == VM_INDEX_UNINITIALIZED) return NULL; // not resolved | |
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416 methodOop m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result); |
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417 oop clazz = sun_dyn_MemberName::clazz(mname); |
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418 if (clazz != NULL && java_lang_Class::is_instance(clazz)) { |
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419 klassOop klass = java_lang_Class::as_klassOop(clazz); |
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420 if (klass != NULL) receiver_limit_result = klass; |
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421 } |
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422 return m; |
710 | 423 } |
424 | |
425 // An unresolved member name is a mere symbolic reference. | |
426 // Resolving it plants a vmtarget/vmindex in it, | |
427 // which refers dirctly to JVM internals. | |
428 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) { | |
429 assert(sun_dyn_MemberName::is_instance(mname()), ""); | |
430 #ifdef ASSERT | |
431 // If this assert throws, renegotiate the sentinel value used by the Java code, | |
432 // so that it is distinct from any valid vtable index value, and any special | |
433 // values defined in methodOopDesc::VtableIndexFlag. | |
434 // The point of the slop is to give the Java code and the JVM some room | |
435 // to independently specify sentinel values. | |
436 const int sentinel_slop = 10; | |
437 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop; | |
438 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels"); | |
439 #endif | |
440 if (sun_dyn_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED) | |
441 return; // already resolved | |
442 oop defc_oop = sun_dyn_MemberName::clazz(mname()); | |
443 oop name_str = sun_dyn_MemberName::name(mname()); | |
444 oop type_str = sun_dyn_MemberName::type(mname()); | |
445 int flags = sun_dyn_MemberName::flags(mname()); | |
446 | |
447 if (defc_oop == NULL || name_str == NULL || type_str == NULL) { | |
448 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve"); | |
449 } | |
450 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop); | |
451 defc_oop = NULL; // safety | |
452 if (defc_klassOop == NULL) return; // a primitive; no resolution possible | |
453 if (!Klass::cast(defc_klassOop)->oop_is_instance()) { | |
454 if (!Klass::cast(defc_klassOop)->oop_is_array()) return; | |
1142 | 455 defc_klassOop = SystemDictionary::Object_klass(); |
710 | 456 } |
457 instanceKlassHandle defc(THREAD, defc_klassOop); | |
458 defc_klassOop = NULL; // safety | |
459 if (defc.is_null()) { | |
460 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class"); | |
461 } | |
462 defc->link_class(CHECK); | |
463 | |
464 // convert the external string name to an internal symbol | |
465 symbolHandle name(THREAD, java_lang_String::as_symbol_or_null(name_str)); | |
466 if (name.is_null()) return; // no such name | |
467 name_str = NULL; // safety | |
468 | |
469 // convert the external string or reflective type to an internal signature | |
470 bool force_signature = (name() == vmSymbols::invoke_name()); | |
471 symbolHandle type; { | |
472 symbolOop type_sym = NULL; | |
473 if (java_dyn_MethodType::is_instance(type_str)) { | |
474 type_sym = java_dyn_MethodType::as_signature(type_str, force_signature, CHECK); | |
475 } else if (java_lang_Class::is_instance(type_str)) { | |
476 type_sym = java_lang_Class::as_signature(type_str, force_signature, CHECK); | |
477 } else if (java_lang_String::is_instance(type_str)) { | |
478 if (force_signature) { | |
479 type = java_lang_String::as_symbol(type_str, CHECK); | |
480 } else { | |
481 type_sym = java_lang_String::as_symbol_or_null(type_str); | |
482 } | |
483 } else { | |
484 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized type"); | |
485 } | |
486 if (type_sym != NULL) | |
487 type = symbolHandle(THREAD, type_sym); | |
488 } | |
489 if (type.is_null()) return; // no such signature exists in the VM | |
490 type_str = NULL; // safety | |
491 | |
492 // Time to do the lookup. | |
493 switch (flags & ALL_KINDS) { | |
494 case IS_METHOD: | |
495 { | |
496 CallInfo result; | |
497 { | |
498 EXCEPTION_MARK; | |
499 if ((flags & JVM_ACC_STATIC) != 0) { | |
500 LinkResolver::resolve_static_call(result, | |
501 defc, name, type, KlassHandle(), false, false, THREAD); | |
502 } else if (defc->is_interface()) { | |
503 LinkResolver::resolve_interface_call(result, Handle(), defc, | |
504 defc, name, type, KlassHandle(), false, false, THREAD); | |
505 } else { | |
506 LinkResolver::resolve_virtual_call(result, Handle(), defc, | |
507 defc, name, type, KlassHandle(), false, false, THREAD); | |
508 } | |
509 if (HAS_PENDING_EXCEPTION) { | |
510 CLEAR_PENDING_EXCEPTION; | |
511 return; | |
512 } | |
513 } | |
514 methodHandle m = result.resolved_method(); | |
515 oop vmtarget = NULL; | |
516 int vmindex = methodOopDesc::nonvirtual_vtable_index; | |
517 if (defc->is_interface()) { | |
518 vmindex = klassItable::compute_itable_index(m()); | |
519 assert(vmindex >= 0, ""); | |
520 } else if (result.has_vtable_index()) { | |
521 vmindex = result.vtable_index(); | |
522 assert(vmindex >= 0, ""); | |
523 } | |
524 assert(vmindex != VM_INDEX_UNINITIALIZED, ""); | |
525 if (vmindex < 0) { | |
526 assert(result.is_statically_bound(), ""); | |
527 vmtarget = m(); | |
528 } else { | |
529 vmtarget = result.resolved_klass()->as_klassOop(); | |
530 } | |
531 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); | |
532 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
533 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
534 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
535 DEBUG_ONLY(int junk; klassOop junk2); | |
536 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), | |
537 "properly stored for later decoding"); | |
538 return; | |
539 } | |
540 case IS_CONSTRUCTOR: | |
541 { | |
542 CallInfo result; | |
543 { | |
544 EXCEPTION_MARK; | |
545 if (name() == vmSymbols::object_initializer_name()) { | |
546 LinkResolver::resolve_special_call(result, | |
547 defc, name, type, KlassHandle(), false, THREAD); | |
548 } else { | |
549 break; // will throw after end of switch | |
550 } | |
551 if (HAS_PENDING_EXCEPTION) { | |
552 CLEAR_PENDING_EXCEPTION; | |
553 return; | |
554 } | |
555 } | |
556 assert(result.is_statically_bound(), ""); | |
557 methodHandle m = result.resolved_method(); | |
558 oop vmtarget = m(); | |
559 int vmindex = methodOopDesc::nonvirtual_vtable_index; | |
560 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); | |
561 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
562 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
563 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
564 DEBUG_ONLY(int junk; klassOop junk2); | |
565 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), | |
566 "properly stored for later decoding"); | |
567 return; | |
568 } | |
569 case IS_FIELD: | |
570 { | |
571 // This is taken from LinkResolver::resolve_field, sans access checks. | |
572 fieldDescriptor fd; // find_field initializes fd if found | |
573 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name(), type(), &fd)); | |
574 // check if field exists; i.e., if a klass containing the field def has been selected | |
575 if (sel_klass.is_null()) return; | |
576 oop vmtarget = sel_klass->as_klassOop(); | |
577 int vmindex = fd.offset(); | |
578 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS); | |
579 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen | |
580 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
581 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
582 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
583 return; | |
584 } | |
585 } | |
586 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); | |
587 } | |
588 | |
589 // Conversely, a member name which is only initialized from JVM internals | |
590 // may have null defc, name, and type fields. | |
591 // Resolving it plants a vmtarget/vmindex in it, | |
592 // which refers directly to JVM internals. | |
593 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { | |
594 assert(sun_dyn_MemberName::is_instance(mname()), ""); | |
595 oop vmtarget = sun_dyn_MemberName::vmtarget(mname()); | |
596 int vmindex = sun_dyn_MemberName::vmindex(mname()); | |
597 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) { | |
598 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); | |
599 } | |
600 | |
601 bool have_defc = (sun_dyn_MemberName::clazz(mname()) != NULL); | |
602 bool have_name = (sun_dyn_MemberName::name(mname()) != NULL); | |
603 bool have_type = (sun_dyn_MemberName::type(mname()) != NULL); | |
604 int flags = sun_dyn_MemberName::flags(mname()); | |
605 | |
606 if (suppress != 0) { | |
607 if (suppress & _suppress_defc) have_defc = true; | |
608 if (suppress & _suppress_name) have_name = true; | |
609 if (suppress & _suppress_type) have_type = true; | |
610 } | |
611 | |
612 if (have_defc && have_name && have_type) return; // nothing needed | |
613 | |
614 switch (flags & ALL_KINDS) { | |
615 case IS_METHOD: | |
616 case IS_CONSTRUCTOR: | |
617 { | |
618 klassOop receiver_limit = NULL; | |
619 int decode_flags = 0; | |
620 methodHandle m(THREAD, decode_vmtarget(vmtarget, vmindex, NULL, | |
621 receiver_limit, decode_flags)); | |
622 if (m.is_null()) break; | |
623 if (!have_defc) { | |
624 klassOop defc = m->method_holder(); | |
625 if (receiver_limit != NULL && receiver_limit != defc | |
626 && Klass::cast(receiver_limit)->is_subtype_of(defc)) | |
627 defc = receiver_limit; | |
628 sun_dyn_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror()); | |
629 } | |
630 if (!have_name) { | |
631 //not java_lang_String::create_from_symbol; let's intern member names | |
632 Handle name = StringTable::intern(m->name(), CHECK); | |
633 sun_dyn_MemberName::set_name(mname(), name()); | |
634 } | |
635 if (!have_type) { | |
636 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); | |
637 sun_dyn_MemberName::set_type(mname(), type()); | |
638 } | |
639 return; | |
640 } | |
641 case IS_FIELD: | |
642 { | |
643 // This is taken from LinkResolver::resolve_field, sans access checks. | |
644 if (!vmtarget->is_klass()) break; | |
645 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break; | |
646 instanceKlassHandle defc(THREAD, (klassOop) vmtarget); | |
647 bool is_static = ((flags & JVM_ACC_STATIC) != 0); | |
648 fieldDescriptor fd; // find_field initializes fd if found | |
649 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) | |
650 break; // cannot expand | |
651 if (!have_defc) { | |
652 sun_dyn_MemberName::set_clazz(mname(), defc->java_mirror()); | |
653 } | |
654 if (!have_name) { | |
655 //not java_lang_String::create_from_symbol; let's intern member names | |
656 Handle name = StringTable::intern(fd.name(), CHECK); | |
657 sun_dyn_MemberName::set_name(mname(), name()); | |
658 } | |
659 if (!have_type) { | |
660 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK); | |
661 sun_dyn_MemberName::set_type(mname(), type()); | |
662 } | |
663 return; | |
664 } | |
665 } | |
666 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); | |
667 } | |
668 | |
669 int MethodHandles::find_MemberNames(klassOop k, | |
670 symbolOop name, symbolOop sig, | |
671 int mflags, klassOop caller, | |
672 int skip, objArrayOop results) { | |
673 DEBUG_ONLY(No_Safepoint_Verifier nsv); | |
674 // this code contains no safepoints! | |
675 | |
676 // %%% take caller into account! | |
677 | |
678 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1; | |
679 | |
680 int rfill = 0, rlimit = results->length(), rskip = skip; | |
681 // overflow measurement: | |
682 int overflow = 0, overflow_limit = MAX2(1000, rlimit); | |
683 | |
684 int match_flags = mflags; | |
685 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); | |
686 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); | |
687 bool local_only = !(search_superc | search_intfc); | |
688 bool classes_only = false; | |
689 | |
690 if (name != NULL) { | |
691 if (name->utf8_length() == 0) return 0; // a match is not possible | |
692 } | |
693 if (sig != NULL) { | |
694 if (sig->utf8_length() == 0) return 0; // a match is not possible | |
695 if (sig->byte_at(0) == '(') | |
696 match_flags &= ~(IS_FIELD | IS_TYPE); | |
697 else | |
698 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); | |
699 } | |
700 | |
701 if ((match_flags & IS_TYPE) != 0) { | |
702 // NYI, and Core Reflection works quite well for this query | |
703 } | |
704 | |
705 if ((match_flags & IS_FIELD) != 0) { | |
706 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { | |
707 if (name != NULL && st.name() != name) | |
708 continue; | |
709 if (sig != NULL && st.signature() != sig) | |
710 continue; | |
711 // passed the filters | |
712 if (rskip > 0) { | |
713 --rskip; | |
714 } else if (rfill < rlimit) { | |
715 oop result = results->obj_at(rfill++); | |
716 if (!sun_dyn_MemberName::is_instance(result)) | |
717 return -99; // caller bug! | |
718 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset()); | |
719 } else if (++overflow >= overflow_limit) { | |
720 match_flags = 0; break; // got tired of looking at overflow | |
721 } | |
722 } | |
723 } | |
724 | |
725 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { | |
726 // watch out for these guys: | |
727 symbolOop init_name = vmSymbols::object_initializer_name(); | |
728 symbolOop clinit_name = vmSymbols::class_initializer_name(); | |
729 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> | |
730 bool negate_name_test = false; | |
731 // fix name so that it captures the intention of IS_CONSTRUCTOR | |
732 if (!(match_flags & IS_METHOD)) { | |
733 // constructors only | |
734 if (name == NULL) { | |
735 name = init_name; | |
736 } else if (name != init_name) { | |
737 return 0; // no constructors of this method name | |
738 } | |
739 } else if (!(match_flags & IS_CONSTRUCTOR)) { | |
740 // methods only | |
741 if (name == NULL) { | |
742 name = init_name; | |
743 negate_name_test = true; // if we see the name, we *omit* the entry | |
744 } else if (name == init_name) { | |
745 return 0; // no methods of this constructor name | |
746 } | |
747 } else { | |
748 // caller will accept either sort; no need to adjust name | |
749 } | |
750 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { | |
751 methodOop m = st.method(); | |
752 symbolOop m_name = m->name(); | |
753 if (m_name == clinit_name) | |
754 continue; | |
755 if (name != NULL && ((m_name != name) ^ negate_name_test)) | |
756 continue; | |
757 if (sig != NULL && m->signature() != sig) | |
758 continue; | |
759 // passed the filters | |
760 if (rskip > 0) { | |
761 --rskip; | |
762 } else if (rfill < rlimit) { | |
763 oop result = results->obj_at(rfill++); | |
764 if (!sun_dyn_MemberName::is_instance(result)) | |
765 return -99; // caller bug! | |
766 MethodHandles::init_MemberName(result, m, true); | |
767 } else if (++overflow >= overflow_limit) { | |
768 match_flags = 0; break; // got tired of looking at overflow | |
769 } | |
770 } | |
771 } | |
772 | |
773 // return number of elements we at leasted wanted to initialize | |
774 return rfill + overflow; | |
775 } | |
776 | |
777 | |
778 | |
779 | |
780 // Decode the vmtarget field of a method handle. | |
781 // Sanitize out methodOops, klassOops, and any other non-Java data. | |
782 // This is for debugging and reflection. | |
783 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) { | |
784 assert(java_dyn_MethodHandle::is_instance(mh()), "must be a MH"); | |
785 if (format == ETF_HANDLE_OR_METHOD_NAME) { | |
786 oop target = java_dyn_MethodHandle::vmtarget(mh()); | |
787 if (target == NULL) { | |
788 return NULL; // unformed MH | |
789 } | |
790 klassOop tklass = target->klass(); | |
1142 | 791 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) { |
710 | 792 return target; // target is another MH (or something else?) |
793 } | |
794 } | |
795 if (format == ETF_DIRECT_HANDLE) { | |
796 oop target = mh(); | |
797 for (;;) { | |
798 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { | |
799 return target; | |
800 } | |
801 if (!java_dyn_MethodHandle::is_instance(target)){ | |
802 return NULL; // unformed MH | |
803 } | |
804 target = java_dyn_MethodHandle::vmtarget(target); | |
805 } | |
806 } | |
807 // cases of metadata in MH.vmtarget: | |
808 // - AMH can have methodOop for static invoke with bound receiver | |
809 // - DMH can have methodOop for static invoke (on variable receiver) | |
810 // - DMH can have klassOop for dispatched (non-static) invoke | |
811 klassOop receiver_limit = NULL; | |
812 int decode_flags = 0; | |
813 methodOop m = decode_MethodHandle(mh(), receiver_limit, decode_flags); | |
814 if (m == NULL) return NULL; | |
815 switch (format) { | |
816 case ETF_REFLECT_METHOD: | |
817 // same as jni_ToReflectedMethod: | |
818 if (m->is_initializer()) { | |
819 return Reflection::new_constructor(m, THREAD); | |
820 } else { | |
821 return Reflection::new_method(m, UseNewReflection, false, THREAD); | |
822 } | |
823 | |
824 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle | |
825 case ETF_METHOD_NAME: | |
826 { | |
827 if (SystemDictionary::MemberName_klass() == NULL) break; | |
828 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass()); | |
829 mname_klass->initialize(CHECK_NULL); | |
830 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); | |
831 sun_dyn_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED); | |
832 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); | |
833 init_MemberName(mname(), m, do_dispatch); | |
834 expand_MemberName(mname, 0, CHECK_NULL); | |
835 return mname(); | |
836 } | |
837 } | |
838 | |
839 // Unknown format code. | |
840 char msg[50]; | |
841 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format); | |
842 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg); | |
843 } | |
844 | |
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845 static const char* always_null_names[] = { |
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846 "java/lang/Void", |
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847 "java/lang/Null", |
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848 //"java/lang/Nothing", |
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849 "sun/dyn/empty/Empty", |
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850 NULL |
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851 }; |
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852 |
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853 static bool is_always_null_type(klassOop klass) { |
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854 if (!Klass::cast(klass)->oop_is_instance()) return false; |
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855 instanceKlass* ik = instanceKlass::cast(klass); |
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856 // Must be on the boot class path: |
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857 if (ik->class_loader() != NULL) return false; |
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858 // Check the name. |
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859 symbolOop name = ik->name(); |
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860 for (int i = 0; ; i++) { |
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861 const char* test_name = always_null_names[i]; |
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862 if (test_name == NULL) break; |
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863 if (name->equals(test_name)) |
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864 return true; |
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865 } |
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866 return false; |
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867 } |
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868 |
710 | 869 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) { |
1142 | 870 if (src == dst || dst == SystemDictionary::Object_klass()) |
710 | 871 return false; // quickest checks |
872 Klass* srck = Klass::cast(src); | |
873 Klass* dstk = Klass::cast(dst); | |
874 if (dstk->is_interface()) { | |
875 // interface receivers can safely be viewed as untyped, | |
876 // because interface calls always include a dynamic check | |
1142 | 877 //dstk = Klass::cast(SystemDictionary::Object_klass()); |
710 | 878 return false; |
879 } | |
880 if (srck->is_interface()) { | |
881 // interface arguments must be viewed as untyped | |
1142 | 882 //srck = Klass::cast(SystemDictionary::Object_klass()); |
710 | 883 return true; |
884 } | |
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885 if (is_always_null_type(src)) { |
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886 // some source types are known to be never instantiated; |
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887 // they represent references which are always null |
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888 // such null references never fail to convert safely |
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889 return false; |
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890 } |
710 | 891 return !srck->is_subclass_of(dstk->as_klassOop()); |
892 } | |
893 | |
894 static oop object_java_mirror() { | |
1142 | 895 return Klass::cast(SystemDictionary::Object_klass())->java_mirror(); |
710 | 896 } |
897 | |
898 bool MethodHandles::same_basic_type_for_arguments(BasicType src, | |
899 BasicType dst, | |
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900 bool raw, |
710 | 901 bool for_return) { |
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902 if (for_return) { |
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903 // return values can always be forgotten: |
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904 if (dst == T_VOID) return true; |
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905 if (src == T_VOID) return raw && (dst == T_INT); |
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906 // We allow caller to receive a garbage int, which is harmless. |
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907 // This trick is pulled by trusted code (see VerifyType.canPassRaw). |
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908 } |
710 | 909 assert(src != T_VOID && dst != T_VOID, "should not be here"); |
910 if (src == dst) return true; | |
911 if (type2size[src] != type2size[dst]) return false; | |
912 // allow reinterpretation casts for integral widening | |
913 if (is_subword_type(src)) { // subwords can fit in int or other subwords | |
914 if (dst == T_INT) // any subword fits in an int | |
915 return true; | |
916 if (src == T_BOOLEAN) // boolean fits in any subword | |
917 return is_subword_type(dst); | |
918 if (src == T_BYTE && dst == T_SHORT) | |
919 return true; // remaining case: byte fits in short | |
920 } | |
921 // allow float/fixed reinterpretation casts | |
922 if (src == T_FLOAT) return dst == T_INT; | |
923 if (src == T_INT) return dst == T_FLOAT; | |
924 if (src == T_DOUBLE) return dst == T_LONG; | |
925 if (src == T_LONG) return dst == T_DOUBLE; | |
926 return false; | |
927 } | |
928 | |
929 const char* MethodHandles::check_method_receiver(methodOop m, | |
930 klassOop passed_recv_type) { | |
931 assert(!m->is_static(), "caller resp."); | |
932 if (passed_recv_type == NULL) | |
933 return "receiver type is primitive"; | |
934 if (class_cast_needed(passed_recv_type, m->method_holder())) { | |
935 Klass* formal = Klass::cast(m->method_holder()); | |
936 return SharedRuntime::generate_class_cast_message("receiver type", | |
937 formal->external_name()); | |
938 } | |
939 return NULL; // checks passed | |
940 } | |
941 | |
942 // Verify that m's signature can be called type-safely by a method handle | |
943 // of the given method type 'mtype'. | |
944 // It takes a TRAPS argument because it must perform symbol lookups. | |
945 void MethodHandles::verify_method_signature(methodHandle m, | |
946 Handle mtype, | |
947 int first_ptype_pos, | |
948 KlassHandle insert_ptype, | |
949 TRAPS) { | |
950 objArrayHandle ptypes(THREAD, java_dyn_MethodType::ptypes(mtype())); | |
951 int pnum = first_ptype_pos; | |
952 int pmax = ptypes->length(); | |
953 int mnum = 0; // method argument | |
954 const char* err = NULL; | |
955 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) { | |
956 oop ptype_oop = NULL; | |
957 if (ss.at_return_type()) { | |
958 if (pnum != pmax) | |
959 { err = "too many arguments"; break; } | |
960 ptype_oop = java_dyn_MethodType::rtype(mtype()); | |
961 } else { | |
962 if (pnum >= pmax) | |
963 { err = "not enough arguments"; break; } | |
964 if (pnum >= 0) | |
965 ptype_oop = ptypes->obj_at(pnum); | |
966 else if (insert_ptype.is_null()) | |
967 ptype_oop = NULL; | |
968 else | |
969 ptype_oop = insert_ptype->java_mirror(); | |
970 pnum += 1; | |
971 mnum += 1; | |
972 } | |
973 klassOop mklass = NULL; | |
974 BasicType mtype = ss.type(); | |
975 if (mtype == T_ARRAY) mtype = T_OBJECT; // fold all refs to T_OBJECT | |
976 if (mtype == T_OBJECT) { | |
977 if (ptype_oop == NULL) { | |
978 // null matches any reference | |
979 continue; | |
980 } | |
981 // If we fail to resolve types at this point, we will throw an error. | |
982 symbolOop name_oop = ss.as_symbol(CHECK); | |
983 symbolHandle name(THREAD, name_oop); | |
984 instanceKlass* mk = instanceKlass::cast(m->method_holder()); | |
985 Handle loader(THREAD, mk->class_loader()); | |
986 Handle domain(THREAD, mk->protection_domain()); | |
987 mklass = SystemDictionary::resolve_or_fail(name, loader, domain, | |
988 true, CHECK); | |
989 } | |
990 if (ptype_oop == NULL) { | |
991 // null does not match any non-reference; use Object to report the error | |
992 ptype_oop = object_java_mirror(); | |
993 } | |
994 klassOop pklass = NULL; | |
995 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass); | |
996 if (!ss.at_return_type()) { | |
997 err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum); | |
998 } else { | |
999 err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal! | |
1000 } | |
1001 if (err != NULL) break; | |
1002 } | |
1003 | |
1004 if (err != NULL) { | |
1005 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
1006 } | |
1007 } | |
1008 | |
1009 // Main routine for verifying the MethodHandle.type of a proposed | |
1010 // direct or bound-direct method handle. | |
1011 void MethodHandles::verify_method_type(methodHandle m, | |
1012 Handle mtype, | |
1013 bool has_bound_recv, | |
1014 KlassHandle bound_recv_type, | |
1015 TRAPS) { | |
1016 bool m_needs_receiver = !m->is_static(); | |
1017 | |
1018 const char* err = NULL; | |
1019 | |
1020 int first_ptype_pos = m_needs_receiver ? 1 : 0; | |
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1021 if (has_bound_recv) { |
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1022 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them |
710 | 1023 if (m_needs_receiver && bound_recv_type.is_null()) |
1024 { err = "bound receiver is not an object"; goto die; } | |
1025 } | |
1026 | |
1027 if (m_needs_receiver && err == NULL) { | |
1028 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype()); | |
1029 if (ptypes->length() < first_ptype_pos) | |
1030 { err = "receiver argument is missing"; goto die; } | |
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1031 if (has_bound_recv) |
710 | 1032 err = check_method_receiver(m(), bound_recv_type->as_klassOop()); |
1033 else | |
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1034 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1))); |
710 | 1035 if (err != NULL) goto die; |
1036 } | |
1037 | |
1038 // Check the other arguments for mistypes. | |
1039 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK); | |
1040 return; | |
1041 | |
1042 die: | |
1043 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
1044 } | |
1045 | |
1046 void MethodHandles::verify_vmslots(Handle mh, TRAPS) { | |
1047 // Verify vmslots. | |
1048 int check_slots = argument_slot_count(java_dyn_MethodHandle::type(mh())); | |
1049 if (java_dyn_MethodHandle::vmslots(mh()) != check_slots) { | |
1050 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH"); | |
1051 } | |
1052 } | |
1053 | |
1054 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) { | |
1055 // Verify that argslot points at the given argnum. | |
1056 int check_slot = argument_slot(java_dyn_MethodHandle::type(mh()), argnum); | |
1057 if (argslot != check_slot || argslot < 0) { | |
1058 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d"; | |
1059 size_t msglen = strlen(fmt) + 3*11 + 1; | |
1060 char* msg = NEW_RESOURCE_ARRAY(char, msglen); | |
1061 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot); | |
1062 THROW_MSG(vmSymbols::java_lang_InternalError(), msg); | |
1063 } | |
1064 } | |
1065 | |
1066 // Verify the correspondence between two method types. | |
1067 // Apart from the advertised changes, caller method type X must | |
1068 // be able to invoke the callee method Y type with no violations | |
1069 // of type integrity. | |
1070 // Return NULL if all is well, else a short error message. | |
1071 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end, | |
1072 int insert_argnum, oop insert_type, | |
1073 int change_argnum, oop change_type, | |
1074 int delete_argnum, | |
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1075 oop dst_mtype, int dst_beg, int dst_end, |
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1076 bool raw) { |
710 | 1077 objArrayOop src_ptypes = java_dyn_MethodType::ptypes(src_mtype); |
1078 objArrayOop dst_ptypes = java_dyn_MethodType::ptypes(dst_mtype); | |
1079 | |
1080 int src_max = src_ptypes->length(); | |
1081 int dst_max = dst_ptypes->length(); | |
1082 | |
1083 if (src_end == -1) src_end = src_max; | |
1084 if (dst_end == -1) dst_end = dst_max; | |
1085 | |
1086 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob"); | |
1087 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob"); | |
1088 | |
1089 // pending actions; set to -1 when done: | |
1090 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum; | |
1091 | |
1092 const char* err = NULL; | |
1093 | |
1094 // Walk along each array of parameter types, including a virtual | |
1095 // NULL end marker at the end of each. | |
1096 for (int src_idx = src_beg, dst_idx = dst_beg; | |
1097 (src_idx <= src_end && dst_idx <= dst_end); | |
1098 src_idx++, dst_idx++) { | |
1099 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx); | |
1100 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx); | |
1101 bool fix_null_src_type = false; | |
1102 | |
1103 // Perform requested edits. | |
1104 if (ins_idx == src_idx) { | |
1105 // note that the inserted guy is never affected by a change or deletion | |
1106 ins_idx = -1; | |
1107 src_type = insert_type; | |
1108 fix_null_src_type = true; | |
1109 --src_idx; // back up to process src type on next loop | |
1110 src_idx = src_end; | |
1111 } else { | |
1112 // note that the changed guy can be immediately deleted | |
1113 if (chg_idx == src_idx) { | |
1114 chg_idx = -1; | |
1115 assert(src_idx < src_end, "oob"); | |
1116 src_type = change_type; | |
1117 fix_null_src_type = true; | |
1118 } | |
1119 if (del_idx == src_idx) { | |
1120 del_idx = -1; | |
1121 assert(src_idx < src_end, "oob"); | |
1122 --dst_idx; | |
1123 continue; // rerun loop after skipping this position | |
1124 } | |
1125 } | |
1126 | |
1127 if (src_type == NULL && fix_null_src_type) | |
1128 // explicit null in this case matches any dest reference | |
1129 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type); | |
1130 | |
1131 // Compare the two argument types. | |
1132 if (src_type != dst_type) { | |
1133 if (src_type == NULL) return "not enough arguments"; | |
1134 if (dst_type == NULL) return "too many arguments"; | |
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1135 err = check_argument_type_change(src_type, dst_type, dst_idx, raw); |
710 | 1136 if (err != NULL) return err; |
1137 } | |
1138 } | |
1139 | |
1140 // Now compare return types also. | |
1141 oop src_rtype = java_dyn_MethodType::rtype(src_mtype); | |
1142 oop dst_rtype = java_dyn_MethodType::rtype(dst_mtype); | |
1143 if (src_rtype != dst_rtype) { | |
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1144 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal! |
710 | 1145 if (err != NULL) return err; |
1146 } | |
1147 | |
1148 assert(err == NULL, ""); | |
1149 return NULL; // all is well | |
1150 } | |
1151 | |
1152 | |
1153 const char* MethodHandles::check_argument_type_change(BasicType src_type, | |
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1154 klassOop src_klass, |
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1155 BasicType dst_type, |
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1156 klassOop dst_klass, |
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1157 int argnum, |
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1158 bool raw) { |
710 | 1159 const char* err = NULL; |
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1160 bool for_return = (argnum < 0); |
710 | 1161 |
1162 // just in case: | |
1163 if (src_type == T_ARRAY) src_type = T_OBJECT; | |
1164 if (dst_type == T_ARRAY) dst_type = T_OBJECT; | |
1165 | |
1166 // Produce some nice messages if VerifyMethodHandles is turned on: | |
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1167 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) { |
710 | 1168 if (src_type == T_OBJECT) { |
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1169 if (raw && dst_type == T_INT && is_always_null_type(src_klass)) |
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1170 return NULL; // OK to convert a null pointer to a garbage int |
710 | 1171 err = ((argnum >= 0) |
1172 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s" | |
1173 : "type mismatch: returning a %s, but caller expects primitive %s"); | |
1174 } else if (dst_type == T_OBJECT) { | |
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1175 err = ((argnum >= 0) |
710 | 1176 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s" |
1177 : "type mismatch: returning a primitive %s, but caller expects %s"); | |
1178 } else { | |
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1179 err = ((argnum >= 0) |
710 | 1180 ? "type mismatch: passing a %s for method argument #%d, which expects %s" |
1181 : "type mismatch: returning a %s, but caller expects %s"); | |
1182 } | |
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1183 } else if (src_type == T_OBJECT && dst_type == T_OBJECT && |
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1184 class_cast_needed(src_klass, dst_klass)) { |
710 | 1185 if (!class_cast_needed(dst_klass, src_klass)) { |
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1186 if (raw) |
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1187 return NULL; // reverse cast is OK; the MH target is trusted to enforce it |
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1188 err = ((argnum >= 0) |
710 | 1189 ? "cast required: passing a %s for method argument #%d, which expects %s" |
1190 : "cast required: returning a %s, but caller expects %s"); | |
1191 } else { | |
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1192 err = ((argnum >= 0) |
710 | 1193 ? "reference mismatch: passing a %s for method argument #%d, which expects %s" |
1194 : "reference mismatch: returning a %s, but caller expects %s"); | |
1195 } | |
1196 } else { | |
1197 // passed the obstacle course | |
1198 return NULL; | |
1199 } | |
1200 | |
1201 // format, format, format | |
1202 const char* src_name = type2name(src_type); | |
1203 const char* dst_name = type2name(dst_type); | |
1204 if (src_type == T_OBJECT) src_name = Klass::cast(src_klass)->external_name(); | |
1205 if (dst_type == T_OBJECT) dst_name = Klass::cast(dst_klass)->external_name(); | |
1206 if (src_name == NULL) src_name = "unknown type"; | |
1207 if (dst_name == NULL) dst_name = "unknown type"; | |
1208 | |
1209 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11); | |
1210 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1); | |
1211 if (argnum >= 0) { | |
1212 assert(strstr(err, "%d") != NULL, ""); | |
1213 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name); | |
1214 } else { | |
1215 assert(strstr(err, "%d") == NULL, ""); | |
1216 jio_snprintf(msg, msglen, err, src_name, dst_name); | |
1217 } | |
1218 return msg; | |
1219 } | |
1220 | |
1221 // Compute the depth within the stack of the given argument, i.e., | |
1222 // the combined size of arguments to the right of the given argument. | |
1223 // For the last argument (ptypes.length-1) this will be zero. | |
1224 // For the first argument (0) this will be the size of all | |
1225 // arguments but that one. For the special number -1, this | |
1226 // will be the size of all arguments, including the first. | |
1227 // If the argument is neither -1 nor a valid argument index, | |
1228 // then return a negative number. Otherwise, the result | |
1229 // is in the range [0..vmslots] inclusive. | |
1230 int MethodHandles::argument_slot(oop method_type, int arg) { | |
1231 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); | |
1232 int argslot = 0; | |
1233 int len = ptypes->length(); | |
1234 if (arg < -1 || arg >= len) return -99; | |
1235 for (int i = len-1; i > arg; i--) { | |
1236 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); | |
1237 argslot += type2size[bt]; | |
1238 } | |
1239 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works"); | |
1240 return argslot; | |
1241 } | |
1242 | |
1243 // Given a slot number, return the argument number. | |
1244 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) { | |
1245 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); | |
1246 int argslot = 0; | |
1247 int len = ptypes->length(); | |
1248 for (int i = len-1; i >= 0; i--) { | |
1249 if (query_argslot == argslot) return i; | |
1250 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); | |
1251 argslot += type2size[bt]; | |
1252 } | |
1253 // return pseudo-arg deepest in stack: | |
1254 if (query_argslot == argslot) return -1; | |
1255 return -99; // oob slot, or splitting a double-slot arg | |
1256 } | |
1257 | |
1258 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m, | |
1259 KlassHandle receiver_limit, | |
1260 int decode_flags, | |
1261 KlassHandle receiver_klass, | |
1262 TRAPS) { | |
1263 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference"); | |
1264 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument"); | |
1265 | |
1266 if (!m->is_static() && | |
1267 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder()))) | |
1268 // given type does not match class of method, or receiver is null! | |
1269 // caller should have checked this, but let's be extra careful... | |
1270 return methodHandle(); | |
1271 | |
1272 if (receiver_limit.not_null() && | |
1273 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit()))) | |
1274 // given type is not limited to the receiver type | |
1275 // note that a null receiver can match any reference value, for a static method | |
1276 return methodHandle(); | |
1277 | |
1278 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) { | |
1279 // pre-dispatched or static method (null receiver is OK for static) | |
1280 return m; | |
1281 | |
1282 } else if (receiver_klass.is_null()) { | |
1283 // null receiver value; cannot dispatch | |
1284 return methodHandle(); | |
1285 | |
1286 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) { | |
1287 // perform virtual dispatch | |
1288 int vtable_index = m->vtable_index(); | |
1289 guarantee(vtable_index >= 0, "valid vtable index"); | |
1290 | |
1291 // receiver_klass might be an arrayKlassOop but all vtables start at | |
1292 // the same place. The cast is to avoid virtual call and assertion. | |
1293 // See also LinkResolver::runtime_resolve_virtual_method. | |
1294 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass()); | |
1295 DEBUG_ONLY(inst->verify_vtable_index(vtable_index)); | |
1296 methodOop m_oop = inst->method_at_vtable(vtable_index); | |
1297 return methodHandle(THREAD, m_oop); | |
1298 | |
1299 } else { | |
1300 // perform interface dispatch | |
1301 int itable_index = klassItable::compute_itable_index(m()); | |
1302 guarantee(itable_index >= 0, "valid itable index"); | |
1303 instanceKlass* inst = instanceKlass::cast(receiver_klass()); | |
1304 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD); | |
1305 return methodHandle(THREAD, m_oop); | |
1306 } | |
1307 } | |
1308 | |
1309 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) { | |
1310 // Verify type. | |
1311 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1312 verify_method_type(m, mtype, false, KlassHandle(), CHECK); | |
1313 | |
1314 // Verify vmslots. | |
1315 if (java_dyn_MethodHandle::vmslots(mh()) != m->size_of_parameters()) { | |
1316 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH"); | |
1317 } | |
1318 } | |
1319 | |
1320 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) { | |
1321 // Check arguments. | |
1322 if (mh.is_null() || m.is_null() || | |
1323 (!do_dispatch && m->is_abstract())) { | |
1324 THROW(vmSymbols::java_lang_InternalError()); | |
1325 } | |
1326 | |
1327 java_dyn_MethodHandle::init_vmslots(mh()); | |
1328 | |
1329 if (VerifyMethodHandles) { | |
1330 // The privileged code which invokes this routine should not make | |
1331 // a mistake about types, but it's better to verify. | |
1332 verify_DirectMethodHandle(mh, m, CHECK); | |
1333 } | |
1334 | |
1335 // Finally, after safety checks are done, link to the target method. | |
1336 // We will follow the same path as the latter part of | |
1337 // InterpreterRuntime::resolve_invoke(), which first finds the method | |
1338 // and then decides how to populate the constant pool cache entry | |
1339 // that links the interpreter calls to the method. We need the same | |
1340 // bits, and will use the same calling sequence code. | |
1341 | |
1342 int vmindex = methodOopDesc::garbage_vtable_index; | |
1343 oop vmtarget = NULL; | |
1344 | |
1345 instanceKlass::cast(m->method_holder())->link_class(CHECK); | |
1346 | |
1347 MethodHandleEntry* me = NULL; | |
1348 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) { | |
1349 // We are simulating an invokeinterface instruction. | |
1350 // (We might also be simulating an invokevirtual on a miranda method, | |
1351 // but it is safe to treat it as an invokeinterface.) | |
1352 assert(!m->can_be_statically_bound(), "no final methods on interfaces"); | |
1353 vmindex = klassItable::compute_itable_index(m()); | |
1354 assert(vmindex >= 0, "(>=0) == do_dispatch"); | |
1355 // Set up same bits as ConstantPoolCacheEntry::set_interface_call(). | |
1356 vmtarget = m->method_holder(); // the interface | |
1357 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh); | |
1358 } else if (!do_dispatch || m->can_be_statically_bound()) { | |
1359 // We are simulating an invokestatic or invokespecial instruction. | |
1360 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method(). | |
1361 vmtarget = m(); | |
1362 // this does not help dispatch, but it will make it possible to parse this MH: | |
1363 vmindex = methodOopDesc::nonvirtual_vtable_index; | |
1364 assert(vmindex < 0, "(>=0) == do_dispatch"); | |
1365 if (!m->is_static()) { | |
1366 me = MethodHandles::entry(MethodHandles::_invokespecial_mh); | |
1367 } else { | |
1368 me = MethodHandles::entry(MethodHandles::_invokestatic_mh); | |
1369 // Part of the semantics of a static call is an initialization barrier. | |
1370 // For a DMH, it is done now, when the handle is created. | |
1371 Klass* k = Klass::cast(m->method_holder()); | |
1372 if (k->should_be_initialized()) { | |
1373 k->initialize(CHECK); | |
1374 } | |
1375 } | |
1376 } else { | |
1377 // We are simulating an invokevirtual instruction. | |
1378 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method(). | |
1379 // The key logic is LinkResolver::runtime_resolve_virtual_method. | |
1380 vmindex = m->vtable_index(); | |
1381 vmtarget = m->method_holder(); | |
1382 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh); | |
1383 } | |
1384 | |
1385 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
1386 | |
1387 sun_dyn_DirectMethodHandle::set_vmtarget(mh(), vmtarget); | |
1388 sun_dyn_DirectMethodHandle::set_vmindex(mh(), vmindex); | |
1389 DEBUG_ONLY(int flags; klassOop rlimit); | |
1390 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(), | |
1391 "properly stored for later decoding"); | |
1392 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0)); | |
1393 assert(!(actual_do_dispatch && !do_dispatch), | |
1394 "do not perform dispatch if !do_dispatch specified"); | |
1395 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch"); | |
1396 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack"); | |
1397 | |
1398 // Done! | |
1399 java_dyn_MethodHandle::set_vmentry(mh(), me); | |
1400 } | |
1401 | |
1402 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh, | |
1403 methodHandle m, | |
1404 TRAPS) { | |
1405 // Verify type. | |
1406 oop receiver = sun_dyn_BoundMethodHandle::argument(mh()); | |
1407 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1408 KlassHandle bound_recv_type; | |
1409 if (receiver != NULL) bound_recv_type = KlassHandle(THREAD, receiver->klass()); | |
1410 verify_method_type(m, mtype, true, bound_recv_type, CHECK); | |
1411 | |
1412 int receiver_pos = m->size_of_parameters() - 1; | |
1413 | |
1414 // Verify MH.vmargslot, which should point at the bound receiver. | |
1415 verify_vmargslot(mh, -1, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); | |
1416 //verify_vmslots(mh, CHECK); | |
1417 | |
1418 // Verify vmslots. | |
1419 if (java_dyn_MethodHandle::vmslots(mh()) != receiver_pos) { | |
1420 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)"); | |
1421 } | |
1422 } | |
1423 | |
1424 // Initialize a BMH with a receiver bound directly to a methodOop. | |
1425 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh, | |
1426 methodHandle original_m, | |
1427 KlassHandle receiver_limit, | |
1428 int decode_flags, | |
1429 TRAPS) { | |
1430 // Check arguments. | |
1431 if (mh.is_null() || original_m.is_null()) { | |
1432 THROW(vmSymbols::java_lang_InternalError()); | |
1433 } | |
1434 | |
1435 KlassHandle receiver_klass; | |
1436 { | |
1437 oop receiver_oop = sun_dyn_BoundMethodHandle::argument(mh()); | |
1438 if (receiver_oop != NULL) | |
1439 receiver_klass = KlassHandle(THREAD, receiver_oop->klass()); | |
1440 } | |
1441 methodHandle m = dispatch_decoded_method(original_m, | |
1442 receiver_limit, decode_flags, | |
1443 receiver_klass, | |
1444 CHECK); | |
1445 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); } | |
1446 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); } | |
1447 | |
1448 java_dyn_MethodHandle::init_vmslots(mh()); | |
1449 | |
1450 if (VerifyMethodHandles) { | |
1451 verify_BoundMethodHandle_with_receiver(mh, m, CHECK); | |
1452 } | |
1453 | |
1454 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); | |
1455 | |
1456 DEBUG_ONLY(int junk; klassOop junk2); | |
1457 assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding"); | |
1458 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot"); | |
1459 | |
1460 // Done! | |
1461 java_dyn_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh)); | |
1462 } | |
1463 | |
1464 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum, | |
1465 bool direct_to_method, TRAPS) { | |
1466 Handle ptype_handle(THREAD, | |
1467 java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum)); | |
1468 KlassHandle ptype_klass; | |
1469 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass); | |
1470 int slots_pushed = type2size[ptype]; | |
1471 | |
1472 oop argument = sun_dyn_BoundMethodHandle::argument(mh()); | |
1473 | |
1474 const char* err = NULL; | |
1475 | |
1476 switch (ptype) { | |
1477 case T_OBJECT: | |
1478 if (argument != NULL) | |
1479 // we must implicitly convert from the arg type to the outgoing ptype | |
1480 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum); | |
1481 break; | |
1482 | |
1483 case T_ARRAY: case T_VOID: | |
1484 assert(false, "array, void do not appear here"); | |
1485 default: | |
1486 if (ptype != T_INT && !is_subword_type(ptype)) { | |
1487 err = "unexpected parameter type"; | |
1488 break; | |
1489 } | |
1490 // check subrange of Integer.value, if necessary | |
1142 | 1491 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) { |
710 | 1492 err = "bound integer argument must be of type java.lang.Integer"; |
1493 break; | |
1494 } | |
1495 if (ptype != T_INT) { | |
1496 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT); | |
1497 jint value = argument->int_field(value_offset); | |
1498 int vminfo = adapter_subword_vminfo(ptype); | |
1499 jint subword = truncate_subword_from_vminfo(value, vminfo); | |
1500 if (value != subword) { | |
1501 err = "bound subword value does not fit into the subword type"; | |
1502 break; | |
1503 } | |
1504 } | |
1505 break; | |
1506 case T_FLOAT: | |
1507 case T_DOUBLE: | |
1508 case T_LONG: | |
1509 { | |
1510 // we must implicitly convert from the unboxed arg type to the outgoing ptype | |
1511 BasicType argbox = java_lang_boxing_object::basic_type(argument); | |
1512 if (argbox != ptype) { | |
1513 err = check_argument_type_change(T_OBJECT, (argument == NULL | |
1142 | 1514 ? SystemDictionary::Object_klass() |
710 | 1515 : argument->klass()), |
1516 ptype, ptype_klass(), argnum); | |
1517 assert(err != NULL, "this must be an error"); | |
1518 } | |
1519 break; | |
1520 } | |
1521 } | |
1522 | |
1523 if (err == NULL) { | |
1524 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); | |
1525 if (direct_to_method) { | |
1526 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots"); | |
1527 assert(slots_pushed <= MethodHandlePushLimit, ""); | |
1528 } else { | |
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1529 int target_pushes = decode_MethodHandle_stack_pushes(target()); |
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1530 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct"); |
710 | 1531 // do not blow the stack; use a Java-based adapter if this limit is exceeded |
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1532 // FIXME |
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1533 // if (slots_pushed + target_pushes > MethodHandlePushLimit) |
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1534 // err = "too many bound parameters"; |
710 | 1535 } |
1536 } | |
1537 | |
1538 if (err == NULL) { | |
1539 // Verify the rest of the method type. | |
1540 err = check_method_type_insertion(java_dyn_MethodHandle::type(mh()), | |
1541 argnum, ptype_handle(), | |
1542 java_dyn_MethodHandle::type(target())); | |
1543 } | |
1544 | |
1545 if (err != NULL) { | |
1546 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
1547 } | |
1548 } | |
1549 | |
1550 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { | |
1551 // Check arguments. | |
1552 if (mh.is_null() || target.is_null() || !java_dyn_MethodHandle::is_instance(target())) { | |
1553 THROW(vmSymbols::java_lang_InternalError()); | |
1554 } | |
1555 | |
1556 java_dyn_MethodHandle::init_vmslots(mh()); | |
1557 | |
1558 if (VerifyMethodHandles) { | |
1559 int insert_after = argnum - 1; | |
1560 verify_vmargslot(mh, insert_after, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); | |
1561 verify_vmslots(mh, CHECK); | |
1562 } | |
1563 | |
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1564 // Get bound type and required slots. |
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1565 oop ptype_oop = java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum); |
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1566 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop); |
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1567 int slots_pushed = type2size[ptype]; |
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1568 |
710 | 1569 // If (a) the target is a direct non-dispatched method handle, |
1570 // or (b) the target is a dispatched direct method handle and we | |
1571 // are binding the receiver, cut out the middle-man. | |
1572 // Do this by decoding the DMH and using its methodOop directly as vmtarget. | |
1573 bool direct_to_method = false; | |
1574 if (OptimizeMethodHandles && | |
1575 target->klass() == SystemDictionary::DirectMethodHandle_klass() && | |
1576 (argnum == 0 || sun_dyn_DirectMethodHandle::vmindex(target()) < 0)) { | |
1577 int decode_flags = 0; klassOop receiver_limit_oop = NULL; | |
1578 methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags)); | |
1579 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); } | |
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1580 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg. |
710 | 1581 assert(sun_dyn_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig"); |
1582 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) { | |
1583 KlassHandle receiver_limit(THREAD, receiver_limit_oop); | |
1584 init_BoundMethodHandle_with_receiver(mh, m, | |
1585 receiver_limit, decode_flags, | |
1586 CHECK); | |
1587 return; | |
1588 } | |
1589 | |
1590 // Even if it is not a bound receiver, we still might be able | |
1591 // to bind another argument and still invoke the methodOop directly. | |
1592 if (!(decode_flags & _dmf_does_dispatch)) { | |
1593 direct_to_method = true; | |
1594 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); | |
1595 } | |
1596 } | |
1597 if (!direct_to_method) | |
1598 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), target()); | |
1599 | |
1600 if (VerifyMethodHandles) { | |
1601 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK); | |
1602 } | |
1603 | |
1604 // Next question: Is this a ref, int, or long bound value? | |
1605 MethodHandleEntry* me = NULL; | |
1606 if (ptype == T_OBJECT) { | |
1607 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh); | |
1608 else me = MethodHandles::entry(_bound_ref_mh); | |
1609 } else if (slots_pushed == 2) { | |
1610 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh); | |
1611 else me = MethodHandles::entry(_bound_long_mh); | |
1612 } else if (slots_pushed == 1) { | |
1613 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh); | |
1614 else me = MethodHandles::entry(_bound_int_mh); | |
1615 } else { | |
1616 assert(false, ""); | |
1617 } | |
1618 | |
1619 // Done! | |
1620 java_dyn_MethodHandle::set_vmentry(mh(), me); | |
1621 } | |
1622 | |
1623 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) { | |
1624 char msg[200]; | |
1625 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err); | |
1626 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg); | |
1627 } | |
1628 | |
1629 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) { | |
1630 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); | |
1631 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); | |
1632 | |
1633 verify_vmargslot(mh, argnum, argslot, CHECK); | |
1634 verify_vmslots(mh, CHECK); | |
1635 | |
1636 jint conv_op = adapter_conversion_op(conversion); | |
1637 if (!conv_op_valid(conv_op)) { | |
1638 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD); | |
1639 return; | |
1640 } | |
1641 EntryKind ek = adapter_entry_kind(conv_op); | |
1642 | |
1643 int stack_move = adapter_conversion_stack_move(conversion); | |
1644 BasicType src = adapter_conversion_src_type(conversion); | |
1645 BasicType dest = adapter_conversion_dest_type(conversion); | |
1646 int vminfo = adapter_conversion_vminfo(conversion); // should be zero | |
1647 | |
1648 Handle argument(THREAD, sun_dyn_AdapterMethodHandle::argument(mh())); | |
1649 Handle target(THREAD, sun_dyn_AdapterMethodHandle::vmtarget(mh())); | |
1650 Handle src_mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1651 Handle dst_mtype(THREAD, java_dyn_MethodHandle::type(target())); | |
1652 | |
1653 const char* err = NULL; | |
1654 | |
1655 if (err == NULL) { | |
1656 // Check that the correct argument is supplied, but only if it is required. | |
1657 switch (ek) { | |
1658 case _adapter_check_cast: // target type of cast | |
1659 case _adapter_ref_to_prim: // wrapper type from which to unbox | |
1660 case _adapter_prim_to_ref: // wrapper type to box into | |
1661 case _adapter_collect_args: // array type to collect into | |
1662 case _adapter_spread_args: // array type to spread from | |
1663 if (!java_lang_Class::is_instance(argument()) | |
1664 || java_lang_Class::is_primitive(argument())) | |
1665 { err = "adapter requires argument of type java.lang.Class"; break; } | |
1666 if (ek == _adapter_collect_args || | |
1667 ek == _adapter_spread_args) { | |
1668 // Make sure it is a suitable collection type. (Array, for now.) | |
1669 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument())); | |
1670 if (!ak->oop_is_objArray()) { | |
1671 { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; } | |
1672 } | |
1673 } | |
1674 break; | |
1675 case _adapter_flyby: | |
1676 case _adapter_ricochet: | |
1677 if (!java_dyn_MethodHandle::is_instance(argument())) | |
1678 { err = "MethodHandle adapter argument required"; break; } | |
1679 break; | |
1680 default: | |
1681 if (argument.not_null()) | |
1682 { err = "adapter has spurious argument"; break; } | |
1683 break; | |
1684 } | |
1685 } | |
1686 | |
1687 if (err == NULL) { | |
1688 // Check that the src/dest types are supplied if needed. | |
1689 switch (ek) { | |
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1690 case _adapter_check_cast: |
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1691 if (src != T_OBJECT || dest != T_OBJECT) { |
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1692 err = "adapter requires object src/dest conversion subfields"; |
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1693 } |
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1694 break; |
710 | 1695 case _adapter_prim_to_prim: |
1696 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) { | |
1697 err = "adapter requires primitive src/dest conversion subfields"; break; | |
1698 } | |
1699 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) || | |
1700 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) { | |
1701 err = "adapter cannot convert beween floating and fixed-point"; break; | |
1702 } | |
1703 break; | |
1704 case _adapter_ref_to_prim: | |
1705 if (src != T_OBJECT || !is_java_primitive(dest) | |
1706 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) { | |
1707 err = "adapter requires primitive dest conversion subfield"; break; | |
1708 } | |
1709 break; | |
1710 case _adapter_prim_to_ref: | |
1711 if (!is_java_primitive(src) || dest != T_OBJECT | |
1712 || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) { | |
1713 err = "adapter requires primitive src conversion subfield"; break; | |
1714 } | |
1715 break; | |
1716 case _adapter_swap_args: | |
1717 case _adapter_rot_args: | |
1718 { | |
1719 if (!src || src != dest) { | |
1720 err = "adapter requires src/dest conversion subfields for swap"; break; | |
1721 } | |
1722 int swap_size = type2size[src]; | |
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1723 oop src_mtype = sun_dyn_AdapterMethodHandle::type(mh()); |
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1724 oop dest_mtype = sun_dyn_AdapterMethodHandle::type(target()); |
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1725 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(target()); |
710 | 1726 int src_slot = argslot; |
1727 int dest_slot = vminfo; | |
1728 bool rotate_up = (src_slot > dest_slot); // upward rotation | |
1729 int src_arg = argnum; | |
1730 int dest_arg = argument_slot_to_argnum(dest_mtype, dest_slot); | |
1731 verify_vmargslot(mh, dest_arg, dest_slot, CHECK); | |
1732 if (!(dest_slot >= src_slot + swap_size) && | |
1733 !(src_slot >= dest_slot + swap_size)) { | |
1734 err = "source, destination slots must be distinct"; | |
1735 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) { | |
1736 err = "source of swap must be deeper in stack"; | |
1737 } else if (ek == _adapter_swap_args) { | |
1738 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, dest_arg), | |
1739 java_dyn_MethodType::ptype(dest_mtype, src_arg), | |
1740 dest_arg); | |
1741 } else if (ek == _adapter_rot_args) { | |
1742 if (rotate_up) { | |
1743 assert((src_slot > dest_slot) && (src_arg < dest_arg), ""); | |
1744 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot] | |
1745 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1] | |
1746 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) { | |
1747 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), | |
1748 java_dyn_MethodType::ptype(dest_mtype, i-1), | |
1749 i); | |
1750 } | |
1751 } else { // rotate down | |
1752 assert((src_slot < dest_slot) && (src_arg > dest_arg), ""); | |
1753 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss] | |
1754 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg] | |
1755 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) { | |
1756 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), | |
1757 java_dyn_MethodType::ptype(dest_mtype, i+1), | |
1758 i); | |
1759 } | |
1760 } | |
1761 } | |
1762 if (err == NULL) | |
1763 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, src_arg), | |
1764 java_dyn_MethodType::ptype(dest_mtype, dest_arg), | |
1765 src_arg); | |
1766 } | |
1767 break; | |
1768 case _adapter_collect_args: | |
1769 case _adapter_spread_args: | |
1770 { | |
1771 BasicType coll_type = (ek == _adapter_collect_args) ? dest : src; | |
1772 BasicType elem_type = (ek == _adapter_collect_args) ? src : dest; | |
1773 if (coll_type != T_OBJECT || elem_type != T_OBJECT) { | |
1774 err = "adapter requires src/dest subfields"; break; | |
1775 // later: | |
1776 // - consider making coll be a primitive array | |
1777 // - consider making coll be a heterogeneous collection | |
1778 } | |
1779 } | |
1780 break; | |
1781 default: | |
1782 if (src != 0 || dest != 0) { | |
1783 err = "adapter has spurious src/dest conversion subfields"; break; | |
1784 } | |
1785 break; | |
1786 } | |
1787 } | |
1788 | |
1789 if (err == NULL) { | |
1790 // Check the stack_move subfield. | |
1791 // It must always report the net change in stack size, positive or negative. | |
1792 int slots_pushed = stack_move / stack_move_unit(); | |
1793 switch (ek) { | |
1794 case _adapter_prim_to_prim: | |
1795 case _adapter_ref_to_prim: | |
1796 case _adapter_prim_to_ref: | |
1797 if (slots_pushed != type2size[dest] - type2size[src]) { | |
1798 err = "wrong stack motion for primitive conversion"; | |
1799 } | |
1800 break; | |
1801 case _adapter_dup_args: | |
1802 if (slots_pushed <= 0) { | |
1803 err = "adapter requires conversion subfield slots_pushed > 0"; | |
1804 } | |
1805 break; | |
1806 case _adapter_drop_args: | |
1807 if (slots_pushed >= 0) { | |
1808 err = "adapter requires conversion subfield slots_pushed < 0"; | |
1809 } | |
1810 break; | |
1811 case _adapter_collect_args: | |
1812 if (slots_pushed > 1) { | |
1813 err = "adapter requires conversion subfield slots_pushed <= 1"; | |
1814 } | |
1815 break; | |
1816 case _adapter_spread_args: | |
1817 if (slots_pushed < -1) { | |
1818 err = "adapter requires conversion subfield slots_pushed >= -1"; | |
1819 } | |
1820 break; | |
1821 default: | |
1822 if (stack_move != 0) { | |
1823 err = "adapter has spurious stack_move conversion subfield"; | |
1824 } | |
1825 break; | |
1826 } | |
1827 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) { | |
1828 err = "stack_move conversion subfield must be multiple of stack_move_unit"; | |
1829 } | |
1830 } | |
1831 | |
1832 if (err == NULL) { | |
1833 // Make sure this adapter does not push too deeply. | |
1834 int slots_pushed = stack_move / stack_move_unit(); | |
1835 int this_vmslots = java_dyn_MethodHandle::vmslots(mh()); | |
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1836 int target_vmslots = java_dyn_MethodHandle::vmslots(target()); |
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1837 if (slots_pushed != (target_vmslots - this_vmslots)) { |
710 | 1838 err = "stack_move inconsistent with previous and current MethodType vmslots"; |
1839 } else if (slots_pushed > 0) { | |
1840 // verify stack_move against MethodHandlePushLimit | |
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1841 int target_pushes = decode_MethodHandle_stack_pushes(target()); |
710 | 1842 // do not blow the stack; use a Java-based adapter if this limit is exceeded |
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1843 if (slots_pushed + target_pushes > MethodHandlePushLimit) { |
710 | 1844 err = "adapter pushes too many parameters"; |
1845 } | |
1846 } | |
1847 | |
1848 // While we're at it, check that the stack motion decoder works: | |
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1849 DEBUG_ONLY(int target_pushes = decode_MethodHandle_stack_pushes(target())); |
710 | 1850 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); |
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1851 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct"); |
710 | 1852 } |
1853 | |
1854 if (err == NULL && vminfo != 0) { | |
1855 switch (ek) { | |
1856 case _adapter_swap_args: | |
1857 case _adapter_rot_args: | |
1858 break; // OK | |
1859 default: | |
1860 err = "vminfo subfield is reserved to the JVM"; | |
1861 } | |
1862 } | |
1863 | |
1864 // Do additional ad hoc checks. | |
1865 if (err == NULL) { | |
1866 switch (ek) { | |
1867 case _adapter_retype_only: | |
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1868 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false); |
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1869 break; |
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1870 |
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1871 case _adapter_retype_raw: |
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1872 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true); |
710 | 1873 break; |
1874 | |
1875 case _adapter_check_cast: | |
1876 { | |
1877 // The actual value being checked must be a reference: | |
1878 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype(), argnum), | |
1879 object_java_mirror(), argnum); | |
1880 if (err != NULL) break; | |
1881 | |
1882 // The output of the cast must fit with the destination argument: | |
1883 Handle cast_class = argument; | |
1884 err = check_method_type_conversion(src_mtype(), | |
1885 argnum, cast_class(), | |
1886 dst_mtype()); | |
1887 } | |
1888 break; | |
1889 | |
1890 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles | |
1891 } | |
1892 } | |
1893 | |
1894 if (err != NULL) { | |
1895 throw_InternalError_for_bad_conversion(conversion, err, THREAD); | |
1896 return; | |
1897 } | |
1898 | |
1899 } | |
1900 | |
1901 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { | |
1902 oop argument = sun_dyn_AdapterMethodHandle::argument(mh()); | |
1903 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); | |
1904 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); | |
1905 jint conv_op = adapter_conversion_op(conversion); | |
1906 | |
1907 // adjust the adapter code to the internal EntryKind enumeration: | |
1908 EntryKind ek_orig = adapter_entry_kind(conv_op); | |
1909 EntryKind ek_opt = ek_orig; // may be optimized | |
1910 | |
1911 // Finalize the vmtarget field (Java initialized it to null). | |
1912 if (!java_dyn_MethodHandle::is_instance(target())) { | |
1913 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD); | |
1914 return; | |
1915 } | |
1916 sun_dyn_AdapterMethodHandle::set_vmtarget(mh(), target()); | |
1917 | |
1918 if (VerifyMethodHandles) { | |
1919 verify_AdapterMethodHandle(mh, argnum, CHECK); | |
1920 } | |
1921 | |
1922 int stack_move = adapter_conversion_stack_move(conversion); | |
1923 BasicType src = adapter_conversion_src_type(conversion); | |
1924 BasicType dest = adapter_conversion_dest_type(conversion); | |
1925 int vminfo = adapter_conversion_vminfo(conversion); // should be zero | |
1926 | |
1927 const char* err = NULL; | |
1928 | |
1929 // Now it's time to finish the case analysis and pick a MethodHandleEntry. | |
1930 switch (ek_orig) { | |
1931 case _adapter_retype_only: | |
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1932 case _adapter_retype_raw: |
710 | 1933 case _adapter_check_cast: |
1934 case _adapter_dup_args: | |
1935 case _adapter_drop_args: | |
1936 // these work fine via general case code | |
1937 break; | |
1938 | |
1939 case _adapter_prim_to_prim: | |
1940 { | |
1941 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}. | |
1942 // And, the {float,double} -> {int,long} cases must be handled by Java. | |
1943 switch (type2size[src] *4+ type2size[dest]) { | |
1944 case 1 *4+ 1: | |
1945 assert(src == T_INT || is_subword_type(src), "source is not float"); | |
1946 // Subword-related cases are int -> {boolean,byte,char,short}. | |
1947 ek_opt = _adapter_opt_i2i; | |
1948 vminfo = adapter_subword_vminfo(dest); | |
1949 break; | |
1950 case 2 *4+ 1: | |
1951 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) { | |
1952 ek_opt = _adapter_opt_l2i; | |
1953 vminfo = adapter_subword_vminfo(dest); | |
1954 } else if (src == T_DOUBLE && dest == T_FLOAT) { | |
1955 ek_opt = _adapter_opt_d2f; | |
1956 } else { | |
1957 assert(false, ""); | |
1958 } | |
1959 break; | |
1960 case 1 *4+ 2: | |
1961 if (src == T_INT && dest == T_LONG) { | |
1962 ek_opt = _adapter_opt_i2l; | |
1963 } else if (src == T_FLOAT && dest == T_DOUBLE) { | |
1964 ek_opt = _adapter_opt_f2d; | |
1965 } else { | |
1966 assert(false, ""); | |
1967 } | |
1968 break; | |
1969 default: | |
1970 assert(false, ""); | |
1971 break; | |
1972 } | |
1973 } | |
1974 break; | |
1975 | |
1976 case _adapter_ref_to_prim: | |
1977 { | |
1978 switch (type2size[dest]) { | |
1979 case 1: | |
1980 ek_opt = _adapter_opt_unboxi; | |
1981 vminfo = adapter_subword_vminfo(dest); | |
1982 break; | |
1983 case 2: | |
1984 ek_opt = _adapter_opt_unboxl; | |
1985 break; | |
1986 default: | |
1987 assert(false, ""); | |
1988 break; | |
1989 } | |
1990 } | |
1991 break; | |
1992 | |
1993 case _adapter_prim_to_ref: | |
1994 goto throw_not_impl; // allocates, hence could block | |
1995 | |
1996 case _adapter_swap_args: | |
1997 case _adapter_rot_args: | |
1998 { | |
1999 int swap_slots = type2size[src]; | |
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2000 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(mh()); |
710 | 2001 int src_slot = argslot; |
2002 int dest_slot = vminfo; | |
2003 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1; | |
2004 switch (swap_slots) { | |
2005 case 1: | |
2006 ek_opt = (!rotate ? _adapter_opt_swap_1 : | |
2007 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down); | |
2008 break; | |
2009 case 2: | |
2010 ek_opt = (!rotate ? _adapter_opt_swap_2 : | |
2011 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down); | |
2012 break; | |
2013 default: | |
2014 assert(false, ""); | |
2015 break; | |
2016 } | |
2017 } | |
2018 break; | |
2019 | |
2020 case _adapter_collect_args: | |
2021 goto throw_not_impl; // allocates, hence could block | |
2022 | |
2023 case _adapter_spread_args: | |
2024 { | |
2025 // vminfo will be the required length of the array | |
2026 int slots_pushed = stack_move / stack_move_unit(); | |
2027 int array_size = slots_pushed + 1; | |
2028 assert(array_size >= 0, ""); | |
2029 vminfo = array_size; | |
2030 switch (array_size) { | |
2031 case 0: ek_opt = _adapter_opt_spread_0; break; | |
2032 case 1: ek_opt = _adapter_opt_spread_1; break; | |
2033 default: ek_opt = _adapter_opt_spread_more; break; | |
2034 } | |
2035 if ((vminfo & CONV_VMINFO_MASK) != vminfo) | |
2036 goto throw_not_impl; // overflow | |
2037 } | |
2038 break; | |
2039 | |
2040 case _adapter_flyby: | |
2041 case _adapter_ricochet: | |
2042 goto throw_not_impl; // runs Java code, hence could block | |
2043 | |
2044 default: | |
2045 // should have failed much earlier; must be a missing case here | |
2046 assert(false, "incomplete switch"); | |
2047 // and fall through: | |
2048 | |
2049 throw_not_impl: | |
2050 // FIXME: these adapters are NYI | |
2051 err = "adapter not yet implemented in the JVM"; | |
2052 break; | |
2053 } | |
2054 | |
2055 if (err != NULL) { | |
2056 throw_InternalError_for_bad_conversion(conversion, err, THREAD); | |
2057 return; | |
2058 } | |
2059 | |
2060 // Rebuild the conversion value; maybe parts of it were changed. | |
2061 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo); | |
2062 | |
2063 // Finalize the conversion field. (Note that it is final to Java code.) | |
2064 sun_dyn_AdapterMethodHandle::set_conversion(mh(), new_conversion); | |
2065 | |
2066 // Done! | |
2067 java_dyn_MethodHandle::set_vmentry(mh(), entry(ek_opt)); | |
2068 | |
2069 // There should be enough memory barriers on exit from native methods | |
2070 // to ensure that the MH is fully initialized to all threads before | |
2071 // Java code can publish it in global data structures. | |
2072 } | |
2073 | |
2074 // | |
2075 // Here are the native methods on sun.dyn.MethodHandleImpl. | |
2076 // They are the private interface between this JVM and the HotSpot-specific | |
2077 // Java code that implements JSR 292 method handles. | |
2078 // | |
2079 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way | |
2080 // that intrinsic (non-JNI) native methods are defined in HotSpot. | |
2081 // | |
2082 | |
2083 // direct method handles for invokestatic or invokespecial | |
2084 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller); | |
2085 JVM_ENTRY(void, MHI_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
2086 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) { | |
2087 ResourceMark rm; // for error messages | |
2088 | |
2089 // This is the guy we are initializing: | |
2090 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2091 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
2092 | |
2093 // Early returns out of this method leave the DMH in an unfinished state. | |
2094 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
2095 | |
2096 // which method are we really talking about? | |
2097 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2098 oop target_oop = JNIHandles::resolve_non_null(target_jh); | |
2099 if (sun_dyn_MemberName::is_instance(target_oop) && | |
2100 sun_dyn_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) { | |
2101 Handle mname(THREAD, target_oop); | |
2102 MethodHandles::resolve_MemberName(mname, CHECK); | |
2103 target_oop = mname(); // in case of GC | |
2104 } | |
2105 | |
2106 int decode_flags = 0; klassOop receiver_limit = NULL; | |
2107 methodHandle m(THREAD, | |
2108 MethodHandles::decode_method(target_oop, | |
2109 receiver_limit, decode_flags)); | |
2110 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); } | |
2111 | |
2112 // The trusted Java code that calls this method should already have performed | |
2113 // access checks on behalf of the given caller. But, we can verify this. | |
2114 if (VerifyMethodHandles && caller_jh != NULL) { | |
2115 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh))); | |
2116 // If this were a bytecode, the first access check would be against | |
2117 // the "reference class" mentioned in the CONSTANT_Methodref. | |
2118 // For that class, we use the defining class of m, | |
2119 // or a more specific receiver limit if available. | |
2120 klassOop reference_klass = m->method_holder(); // OK approximation | |
2121 if (receiver_limit != NULL && receiver_limit != reference_klass) { | |
2122 if (!Klass::cast(receiver_limit)->is_subtype_of(reference_klass)) | |
2123 THROW_MSG(vmSymbols::java_lang_InternalError(), "receiver limit out of bounds"); // Java code bug | |
2124 reference_klass = receiver_limit; | |
2125 } | |
2126 // Emulate LinkResolver::check_klass_accessability. | |
2127 if (!Reflection::verify_class_access(caller->as_klassOop(), | |
2128 reference_klass, | |
2129 true)) { | |
2130 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(m->method_holder())->external_name()); | |
2131 } | |
2132 // If there were a bytecode, the next step would be to lookup the method | |
2133 // in the reference class, then then check the method's access bits. | |
2134 // Emulate LinkResolver::check_method_accessability. | |
2135 klassOop resolved_klass = m->method_holder(); | |
2136 if (!Reflection::verify_field_access(caller->as_klassOop(), | |
2137 resolved_klass, reference_klass, | |
2138 m->access_flags(), | |
2139 true)) { | |
2140 // %%% following cutout belongs in Reflection::verify_field_access? | |
2141 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(), | |
2142 reference_klass, THREAD); | |
2143 if (!same_pm) { | |
2144 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string()); | |
2145 } | |
2146 } | |
2147 } | |
2148 | |
2149 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK); | |
2150 } | |
2151 JVM_END | |
2152 | |
2153 // bound method handles | |
2154 JVM_ENTRY(void, MHI_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
2155 jobject target_jh, int argnum)) { | |
2156 ResourceMark rm; // for error messages | |
2157 | |
2158 // This is the guy we are initializing: | |
2159 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2160 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
2161 | |
2162 // Early returns out of this method leave the BMH in an unfinished state. | |
2163 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
2164 | |
2165 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2166 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); | |
2167 | |
2168 if (!java_dyn_MethodHandle::is_instance(target())) { | |
2169 // Target object is a reflective method. (%%% Do we need this alternate path?) | |
2170 Untested("init_BMH of non-MH"); | |
2171 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); } | |
2172 int decode_flags = 0; klassOop receiver_limit_oop = NULL; | |
2173 methodHandle m(THREAD, | |
2174 MethodHandles::decode_method(target(), | |
2175 receiver_limit_oop, | |
2176 decode_flags)); | |
2177 KlassHandle receiver_limit(THREAD, receiver_limit_oop); | |
2178 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m, | |
2179 receiver_limit, | |
2180 decode_flags, | |
2181 CHECK); | |
2182 return; | |
2183 } | |
2184 | |
2185 // Build a BMH on top of a DMH or another BMH: | |
2186 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK); | |
2187 } | |
2188 JVM_END | |
2189 | |
2190 // adapter method handles | |
2191 JVM_ENTRY(void, MHI_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
2192 jobject target_jh, int argnum)) { | |
2193 // This is the guy we are initializing: | |
2194 if (mh_jh == NULL || target_jh == NULL) { | |
2195 THROW(vmSymbols::java_lang_InternalError()); | |
2196 } | |
2197 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
2198 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); | |
2199 | |
2200 // Early returns out of this method leave the AMH in an unfinished state. | |
2201 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
2202 | |
2203 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK); | |
2204 } | |
2205 JVM_END | |
2206 | |
2207 // method type forms | |
2208 JVM_ENTRY(void, MHI_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) { | |
2209 if (erased_jh == NULL) return; | |
2210 if (TraceMethodHandles) { | |
2211 tty->print("creating MethodType form "); | |
2212 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH! | |
2213 // call Object.toString() | |
2214 symbolOop name = vmSymbols::toString_name(), sig = vmSymbols::void_string_signature(); | |
2215 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh))); | |
2216 JavaValue result(T_OBJECT); | |
1142 | 2217 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig, |
710 | 2218 &args, CHECK); |
2219 Handle str(THREAD, (oop)result.get_jobject()); | |
2220 java_lang_String::print(str, tty); | |
2221 } | |
2222 tty->cr(); | |
2223 } | |
2224 } | |
2225 JVM_END | |
2226 | |
2227 // debugging and reflection | |
2228 JVM_ENTRY(jobject, MHI_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) { | |
2229 Handle mh(THREAD, JNIHandles::resolve(mh_jh)); | |
2230 if (!java_dyn_MethodHandle::is_instance(mh())) { | |
2231 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); | |
2232 } | |
2233 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL); | |
2234 return JNIHandles::make_local(THREAD, target); | |
2235 } | |
2236 JVM_END | |
2237 | |
2238 JVM_ENTRY(jint, MHI_getConstant(JNIEnv *env, jobject igcls, jint which)) { | |
2239 switch (which) { | |
2240 case MethodHandles::GC_JVM_PUSH_LIMIT: | |
2241 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF, | |
2242 "MethodHandlePushLimit parameter must be in valid range"); | |
2243 return MethodHandlePushLimit; | |
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2244 case MethodHandles::GC_JVM_STACK_MOVE_UNIT: |
710 | 2245 // return number of words per slot, signed according to stack direction |
2246 return MethodHandles::stack_move_unit(); | |
2247 } | |
2248 return 0; | |
2249 } | |
2250 JVM_END | |
2251 | |
2252 #ifndef PRODUCT | |
2253 #define EACH_NAMED_CON(template) \ | |
2254 template(MethodHandles,GC_JVM_PUSH_LIMIT) \ | |
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2255 template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) \ |
710 | 2256 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \ |
2257 template(MethodHandles,ETF_DIRECT_HANDLE) \ | |
2258 template(MethodHandles,ETF_METHOD_NAME) \ | |
2259 template(MethodHandles,ETF_REFLECT_METHOD) \ | |
2260 template(sun_dyn_MemberName,MN_IS_METHOD) \ | |
2261 template(sun_dyn_MemberName,MN_IS_CONSTRUCTOR) \ | |
2262 template(sun_dyn_MemberName,MN_IS_FIELD) \ | |
2263 template(sun_dyn_MemberName,MN_IS_TYPE) \ | |
2264 template(sun_dyn_MemberName,MN_SEARCH_SUPERCLASSES) \ | |
2265 template(sun_dyn_MemberName,MN_SEARCH_INTERFACES) \ | |
2266 template(sun_dyn_MemberName,VM_INDEX_UNINITIALIZED) \ | |
2267 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_ONLY) \ | |
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2268 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_RAW) \ |
710 | 2269 template(sun_dyn_AdapterMethodHandle,OP_CHECK_CAST) \ |
2270 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_PRIM) \ | |
2271 template(sun_dyn_AdapterMethodHandle,OP_REF_TO_PRIM) \ | |
2272 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_REF) \ | |
2273 template(sun_dyn_AdapterMethodHandle,OP_SWAP_ARGS) \ | |
2274 template(sun_dyn_AdapterMethodHandle,OP_ROT_ARGS) \ | |
2275 template(sun_dyn_AdapterMethodHandle,OP_DUP_ARGS) \ | |
2276 template(sun_dyn_AdapterMethodHandle,OP_DROP_ARGS) \ | |
2277 template(sun_dyn_AdapterMethodHandle,OP_COLLECT_ARGS) \ | |
2278 template(sun_dyn_AdapterMethodHandle,OP_SPREAD_ARGS) \ | |
2279 template(sun_dyn_AdapterMethodHandle,OP_FLYBY) \ | |
2280 template(sun_dyn_AdapterMethodHandle,OP_RICOCHET) \ | |
2281 template(sun_dyn_AdapterMethodHandle,CONV_OP_LIMIT) \ | |
2282 template(sun_dyn_AdapterMethodHandle,CONV_OP_MASK) \ | |
2283 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_MASK) \ | |
2284 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_SHIFT) \ | |
2285 template(sun_dyn_AdapterMethodHandle,CONV_OP_SHIFT) \ | |
2286 template(sun_dyn_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \ | |
2287 template(sun_dyn_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \ | |
2288 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \ | |
2289 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \ | |
2290 /*end*/ | |
2291 | |
2292 #define ONE_PLUS(scope,value) 1+ | |
2293 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0; | |
2294 #define VALUE_COMMA(scope,value) scope::value, | |
2295 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 }; | |
2296 #define STRING_NULL(scope,value) #value "\0" | |
2297 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) }; | |
2298 | |
2299 #undef ONE_PLUS | |
2300 #undef VALUE_COMMA | |
2301 #undef STRING_NULL | |
2302 #undef EACH_NAMED_CON | |
2303 #endif | |
2304 | |
2305 JVM_ENTRY(jint, MHI_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { | |
2306 #ifndef PRODUCT | |
2307 if (which >= 0 && which < con_value_count) { | |
2308 int con = con_values[which]; | |
2309 objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh); | |
2310 if (box != NULL && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { | |
2311 const char* str = &con_names[0]; | |
2312 for (int i = 0; i < which; i++) | |
2313 str += strlen(str) + 1; // skip name and null | |
2314 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); | |
2315 box->obj_at_put(0, name); | |
2316 } | |
2317 return con; | |
2318 } | |
2319 #endif | |
2320 return 0; | |
2321 } | |
2322 JVM_END | |
2323 | |
2324 // void init(MemberName self, AccessibleObject ref) | |
2325 JVM_ENTRY(void, MHI_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { | |
2326 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2327 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
2328 oop target_oop = JNIHandles::resolve_non_null(target_jh); | |
2329 MethodHandles::init_MemberName(mname(), target_oop); | |
2330 } | |
2331 JVM_END | |
2332 | |
2333 // void expand(MemberName self) | |
2334 JVM_ENTRY(void, MHI_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { | |
2335 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2336 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
2337 MethodHandles::expand_MemberName(mname, 0, CHECK); | |
2338 } | |
2339 JVM_END | |
2340 | |
2341 // void resolve(MemberName self, Class<?> caller) | |
2342 JVM_ENTRY(void, MHI_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { | |
2343 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2344 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
2345 // %%% take caller into account! | |
2346 MethodHandles::resolve_MemberName(mname, CHECK); | |
2347 } | |
2348 JVM_END | |
2349 | |
2350 // static native int getMembers(Class<?> defc, String matchName, String matchSig, | |
2351 // int matchFlags, Class<?> caller, int skip, MemberName[] results); | |
2352 JVM_ENTRY(jint, MHI_getMembers(JNIEnv *env, jobject igcls, | |
2353 jclass clazz_jh, jstring name_jh, jstring sig_jh, | |
2354 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { | |
2355 if (clazz_jh == NULL || results_jh == NULL) return -1; | |
2356 klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)); | |
2357 | |
2358 objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh); | |
2359 if (results == NULL || !results->is_objArray()) return -1; | |
2360 | |
2361 symbolOop name = NULL, sig = NULL; | |
2362 if (name_jh != NULL) { | |
2363 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); | |
2364 if (name == NULL) return 0; // a match is not possible | |
2365 } | |
2366 if (sig_jh != NULL) { | |
2367 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); | |
2368 if (sig == NULL) return 0; // a match is not possible | |
2369 } | |
2370 | |
2371 klassOop caller = NULL; | |
2372 if (caller_jh != NULL) { | |
2373 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); | |
2374 if (!java_lang_Class::is_instance(caller_oop)) return -1; | |
2375 caller = java_lang_Class::as_klassOop(caller_oop); | |
2376 } | |
2377 | |
2378 if (name != NULL && sig != NULL && results != NULL) { | |
2379 // try a direct resolve | |
2380 // %%% TO DO | |
2381 } | |
2382 | |
2383 int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags, | |
2384 caller, skip, results); | |
2385 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks | |
2386 return res; | |
2387 } | |
2388 JVM_END | |
2389 | |
2390 | |
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2391 JVM_ENTRY(void, MH_linkCallSite(JNIEnv *env, jobject igcls, jobject site_jh, jobject target_jh)) { |
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2392 // No special action required, yet. |
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2393 oop site_oop = JNIHandles::resolve(site_jh); |
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2394 if (site_oop == NULL || site_oop->klass() != SystemDictionary::CallSite_klass()) |
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2395 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "call site"); |
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2396 java_dyn_CallSite::set_target(site_oop, JNIHandles::resolve(target_jh)); |
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2397 } |
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2398 JVM_END |
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2399 |
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2400 |
710 | 2401 /// JVM_RegisterMethodHandleMethods |
2402 | |
2403 #define ADR "J" | |
2404 | |
2405 #define LANG "Ljava/lang/" | |
2406 #define JDYN "Ljava/dyn/" | |
2407 #define IDYN "Lsun/dyn/" | |
2408 | |
2409 #define OBJ LANG"Object;" | |
2410 #define CLS LANG"Class;" | |
2411 #define STRG LANG"String;" | |
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2412 #define CST JDYN"CallSite;" |
710 | 2413 #define MT JDYN"MethodType;" |
2414 #define MH JDYN"MethodHandle;" | |
2415 #define MHI IDYN"MethodHandleImpl;" | |
2416 #define MEM IDYN"MemberName;" | |
2417 #define AMH IDYN"AdapterMethodHandle;" | |
2418 #define BMH IDYN"BoundMethodHandle;" | |
2419 #define DMH IDYN"DirectMethodHandle;" | |
2420 | |
2421 #define CC (char*) /*cast a literal from (const char*)*/ | |
2422 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) | |
2423 | |
2424 // These are the native methods on sun.dyn.MethodHandleNatives. | |
2425 static JNINativeMethod methods[] = { | |
2426 // void init(MemberName self, AccessibleObject ref) | |
2427 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHI_init_AMH)}, | |
2428 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHI_init_BMH)}, | |
2429 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHI_init_DMH)}, | |
2430 {CC"init", CC"("MT")V", FN_PTR(MHI_init_MT)}, | |
2431 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHI_init_Mem)}, | |
2432 {CC"expand", CC"("MEM")V", FN_PTR(MHI_expand_Mem)}, | |
2433 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHI_resolve_Mem)}, | |
2434 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHI_getTarget)}, | |
2435 {CC"getConstant", CC"(I)I", FN_PTR(MHI_getConstant)}, | |
2436 // static native int getNamedCon(int which, Object[] name) | |
2437 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHI_getNamedCon)}, | |
2438 // static native int getMembers(Class<?> defc, String matchName, String matchSig, | |
2439 // int matchFlags, Class<?> caller, int skip, MemberName[] results); | |
2440 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHI_getMembers)} | |
2441 }; | |
2442 | |
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2443 // More entry points specifically for EnableInvokeDynamic. |
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2444 static JNINativeMethod methods2[] = { |
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2445 {CC"linkCallSite", CC"("CST MH")V", FN_PTR(MH_linkCallSite)} |
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2446 }; |
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2447 |
710 | 2448 |
2449 // This one function is exported, used by NativeLookup. | |
2450 | |
2451 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { | |
2452 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK"); | |
2453 | |
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2454 // note: this explicit warning-producing stuff will be replaced by auto-detection of the JSR 292 classes |
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2455 |
710 | 2456 if (!EnableMethodHandles) { |
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2457 warning("JSR 292 method handles are disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableMethodHandles to enable."); |
710 | 2458 return; // bind nothing |
2459 } | |
2460 | |
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2461 bool enable_MH = true; |
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2462 |
710 | 2463 { |
2464 ThreadToNativeFromVM ttnfv(thread); | |
2465 | |
2466 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod)); | |
2467 if (env->ExceptionOccurred()) { | |
2468 MethodHandles::set_enabled(false); | |
2469 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); | |
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2470 enable_MH = false; |
710 | 2471 env->ExceptionClear(); |
2472 } | |
2473 } | |
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2474 |
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2475 if (enable_MH) { |
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2476 KlassHandle MHI_klass = SystemDictionaryHandles::MethodHandleImpl_klass(); |
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2477 if (MHI_klass.not_null()) { |
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2478 symbolHandle raiseException_name = oopFactory::new_symbol_handle("raiseException", CHECK); |
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2479 symbolHandle raiseException_sig = oopFactory::new_symbol_handle("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK); |
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2480 methodOop raiseException_method = instanceKlass::cast(MHI_klass->as_klassOop()) |
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2481 ->find_method(raiseException_name(), raiseException_sig()); |
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2482 if (raiseException_method != NULL && raiseException_method->is_static()) { |
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2483 MethodHandles::set_raise_exception_method(raiseException_method); |
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2484 } else { |
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2485 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); |
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2486 enable_MH = false; |
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2487 } |
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2488 } |
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2489 } |
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2490 |
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2491 if (enable_MH) { |
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2492 MethodHandles::set_enabled(true); |
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2493 } |
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2494 |
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2495 if (!EnableInvokeDynamic) { |
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2496 warning("JSR 292 invokedynamic is disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableInvokeDynamic to enable."); |
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2497 return; // bind nothing |
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2498 } |
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2499 |
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2500 { |
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2501 ThreadToNativeFromVM ttnfv(thread); |
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2502 |
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2503 int status = env->RegisterNatives(MHN_class, methods2, sizeof(methods2)/sizeof(JNINativeMethod)); |
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2504 if (env->ExceptionOccurred()) { |
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2505 MethodHandles::set_enabled(false); |
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2506 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); |
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2507 env->ExceptionClear(); |
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2508 } else { |
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2509 MethodHandles::set_enabled(true); |
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2510 } |
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2511 } |
710 | 2512 } |
2513 JVM_END |