Mercurial > hg > graal-compiler
annotate src/share/vm/prims/methodHandles.cpp @ 1711:a6bff45449bc
6973570: OrderAccess::storestore() scales poorly on multi-socket x64 and sparc: cache-line ping-ponging
Summary: volatile store to static variable removed in favour of a volatile store to stack to avoid excessive cache coherency traffic; verified that the volatile store is not elided by any of our current compilers.
Reviewed-by: dholmes, dice, jcoomes, kvn
author | ysr |
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date | Tue, 10 Aug 2010 14:53:35 -0700 |
parents | 083fde3b838e |
children | 3e8fbc61cee8 |
rev | line source |
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710 | 1 /* |
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2 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
710 | 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 | |
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369 Handle MethodHandles::new_MemberName(TRAPS) { |
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370 Handle empty; |
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371 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); |
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372 if (!k->is_initialized()) k->initialize(CHECK_(empty)); |
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373 return Handle(THREAD, k->allocate_instance(THREAD)); |
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374 } |
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375 |
710 | 376 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) { |
1142 | 377 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) { |
710 | 378 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() |
379 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() | |
380 int mods = java_lang_reflect_Field::modifiers(target_oop); | |
381 klassOop k = java_lang_Class::as_klassOop(clazz); | |
382 int offset = instanceKlass::cast(k)->offset_from_fields(slot); | |
383 init_MemberName(mname_oop, k, accessFlags_from(mods), offset); | |
384 } else { | |
385 int decode_flags = 0; klassOop receiver_limit = NULL; | |
386 methodOop m = MethodHandles::decode_method(target_oop, | |
387 receiver_limit, decode_flags); | |
388 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); | |
389 init_MemberName(mname_oop, m, do_dispatch); | |
390 } | |
391 } | |
392 | |
393 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) { | |
394 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD) | |
395 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS )); | |
396 oop vmtarget = m; | |
397 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet | |
398 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound()) | |
399 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch | |
400 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value"); | |
401 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); | |
402 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); | |
403 sun_dyn_MemberName::set_flags(mname_oop, flags); | |
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404 sun_dyn_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror()); |
710 | 405 } |
406 | |
407 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) { | |
408 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS )); | |
409 oop vmtarget = field_holder; | |
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410 int vmindex = offset; // determines the field uniquely when combined with static bit |
710 | 411 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex"); |
412 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); | |
413 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); | |
414 sun_dyn_MemberName::set_flags(mname_oop, flags); | |
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415 sun_dyn_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror()); |
710 | 416 } |
417 | |
418 | |
419 methodOop MethodHandles::decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result) { | |
420 int flags = sun_dyn_MemberName::flags(mname); | |
421 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return NULL; // not invocable | |
422 oop vmtarget = sun_dyn_MemberName::vmtarget(mname); | |
423 int vmindex = sun_dyn_MemberName::vmindex(mname); | |
424 if (vmindex == VM_INDEX_UNINITIALIZED) return NULL; // not resolved | |
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425 methodOop m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result); |
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426 oop clazz = sun_dyn_MemberName::clazz(mname); |
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427 if (clazz != NULL && java_lang_Class::is_instance(clazz)) { |
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428 klassOop klass = java_lang_Class::as_klassOop(clazz); |
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429 if (klass != NULL) receiver_limit_result = klass; |
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430 } |
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431 return m; |
710 | 432 } |
433 | |
434 // An unresolved member name is a mere symbolic reference. | |
435 // Resolving it plants a vmtarget/vmindex in it, | |
436 // which refers dirctly to JVM internals. | |
437 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) { | |
438 assert(sun_dyn_MemberName::is_instance(mname()), ""); | |
439 #ifdef ASSERT | |
440 // If this assert throws, renegotiate the sentinel value used by the Java code, | |
441 // so that it is distinct from any valid vtable index value, and any special | |
442 // values defined in methodOopDesc::VtableIndexFlag. | |
443 // The point of the slop is to give the Java code and the JVM some room | |
444 // to independently specify sentinel values. | |
445 const int sentinel_slop = 10; | |
446 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop; | |
447 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels"); | |
448 #endif | |
449 if (sun_dyn_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED) | |
450 return; // already resolved | |
451 oop defc_oop = sun_dyn_MemberName::clazz(mname()); | |
452 oop name_str = sun_dyn_MemberName::name(mname()); | |
453 oop type_str = sun_dyn_MemberName::type(mname()); | |
454 int flags = sun_dyn_MemberName::flags(mname()); | |
455 | |
456 if (defc_oop == NULL || name_str == NULL || type_str == NULL) { | |
457 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve"); | |
458 } | |
459 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop); | |
460 defc_oop = NULL; // safety | |
461 if (defc_klassOop == NULL) return; // a primitive; no resolution possible | |
462 if (!Klass::cast(defc_klassOop)->oop_is_instance()) { | |
463 if (!Klass::cast(defc_klassOop)->oop_is_array()) return; | |
1142 | 464 defc_klassOop = SystemDictionary::Object_klass(); |
710 | 465 } |
466 instanceKlassHandle defc(THREAD, defc_klassOop); | |
467 defc_klassOop = NULL; // safety | |
468 if (defc.is_null()) { | |
469 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class"); | |
470 } | |
471 defc->link_class(CHECK); | |
472 | |
473 // convert the external string name to an internal symbol | |
474 symbolHandle name(THREAD, java_lang_String::as_symbol_or_null(name_str)); | |
475 if (name.is_null()) return; // no such name | |
476 name_str = NULL; // safety | |
477 | |
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478 Handle polymorphic_method_type; |
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479 bool polymorphic_signature = false; |
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480 if ((flags & ALL_KINDS) == IS_METHOD && |
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481 (defc() == SystemDictionary::InvokeDynamic_klass() || |
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482 (defc() == SystemDictionary::MethodHandle_klass() && |
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483 methodOopDesc::is_method_handle_invoke_name(name())))) |
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484 polymorphic_signature = true; |
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485 |
710 | 486 // convert the external string or reflective type to an internal signature |
487 symbolHandle type; { | |
488 symbolOop type_sym = NULL; | |
489 if (java_dyn_MethodType::is_instance(type_str)) { | |
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490 type_sym = java_dyn_MethodType::as_signature(type_str, polymorphic_signature, CHECK); |
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491 if (polymorphic_signature) |
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492 polymorphic_method_type = Handle(THREAD, type_str); //preserve exactly |
710 | 493 } else if (java_lang_Class::is_instance(type_str)) { |
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494 type_sym = java_lang_Class::as_signature(type_str, false, CHECK); |
710 | 495 } else if (java_lang_String::is_instance(type_str)) { |
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496 if (polymorphic_signature) { |
710 | 497 type = java_lang_String::as_symbol(type_str, CHECK); |
498 } else { | |
499 type_sym = java_lang_String::as_symbol_or_null(type_str); | |
500 } | |
501 } else { | |
502 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized type"); | |
503 } | |
504 if (type_sym != NULL) | |
505 type = symbolHandle(THREAD, type_sym); | |
506 } | |
507 if (type.is_null()) return; // no such signature exists in the VM | |
508 type_str = NULL; // safety | |
509 | |
510 // Time to do the lookup. | |
511 switch (flags & ALL_KINDS) { | |
512 case IS_METHOD: | |
513 { | |
514 CallInfo result; | |
515 { | |
516 EXCEPTION_MARK; | |
517 if ((flags & JVM_ACC_STATIC) != 0) { | |
518 LinkResolver::resolve_static_call(result, | |
519 defc, name, type, KlassHandle(), false, false, THREAD); | |
520 } else if (defc->is_interface()) { | |
521 LinkResolver::resolve_interface_call(result, Handle(), defc, | |
522 defc, name, type, KlassHandle(), false, false, THREAD); | |
523 } else { | |
524 LinkResolver::resolve_virtual_call(result, Handle(), defc, | |
525 defc, name, type, KlassHandle(), false, false, THREAD); | |
526 } | |
527 if (HAS_PENDING_EXCEPTION) { | |
528 CLEAR_PENDING_EXCEPTION; | |
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529 break; // go to second chance |
710 | 530 } |
531 } | |
532 methodHandle m = result.resolved_method(); | |
533 oop vmtarget = NULL; | |
534 int vmindex = methodOopDesc::nonvirtual_vtable_index; | |
535 if (defc->is_interface()) { | |
536 vmindex = klassItable::compute_itable_index(m()); | |
537 assert(vmindex >= 0, ""); | |
538 } else if (result.has_vtable_index()) { | |
539 vmindex = result.vtable_index(); | |
540 assert(vmindex >= 0, ""); | |
541 } | |
542 assert(vmindex != VM_INDEX_UNINITIALIZED, ""); | |
543 if (vmindex < 0) { | |
544 assert(result.is_statically_bound(), ""); | |
545 vmtarget = m(); | |
546 } else { | |
547 vmtarget = result.resolved_klass()->as_klassOop(); | |
548 } | |
549 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); | |
550 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
551 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
552 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
553 DEBUG_ONLY(int junk; klassOop junk2); | |
554 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), | |
555 "properly stored for later decoding"); | |
556 return; | |
557 } | |
558 case IS_CONSTRUCTOR: | |
559 { | |
560 CallInfo result; | |
561 { | |
562 EXCEPTION_MARK; | |
563 if (name() == vmSymbols::object_initializer_name()) { | |
564 LinkResolver::resolve_special_call(result, | |
565 defc, name, type, KlassHandle(), false, THREAD); | |
566 } else { | |
567 break; // will throw after end of switch | |
568 } | |
569 if (HAS_PENDING_EXCEPTION) { | |
570 CLEAR_PENDING_EXCEPTION; | |
571 return; | |
572 } | |
573 } | |
574 assert(result.is_statically_bound(), ""); | |
575 methodHandle m = result.resolved_method(); | |
576 oop vmtarget = m(); | |
577 int vmindex = methodOopDesc::nonvirtual_vtable_index; | |
578 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); | |
579 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
580 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
581 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
582 DEBUG_ONLY(int junk; klassOop junk2); | |
583 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), | |
584 "properly stored for later decoding"); | |
585 return; | |
586 } | |
587 case IS_FIELD: | |
588 { | |
589 // This is taken from LinkResolver::resolve_field, sans access checks. | |
590 fieldDescriptor fd; // find_field initializes fd if found | |
591 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name(), type(), &fd)); | |
592 // check if field exists; i.e., if a klass containing the field def has been selected | |
593 if (sel_klass.is_null()) return; | |
594 oop vmtarget = sel_klass->as_klassOop(); | |
595 int vmindex = fd.offset(); | |
596 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS); | |
597 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen | |
598 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
599 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
600 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
601 return; | |
602 } | |
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603 default: |
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604 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); |
710 | 605 } |
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606 |
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607 // Second chance. |
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608 if (polymorphic_method_type.not_null()) { |
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609 // Look on a non-null class loader. |
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610 Handle cur_class_loader; |
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611 const int nptypes = java_dyn_MethodType::ptype_count(polymorphic_method_type()); |
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612 for (int i = 0; i <= nptypes; i++) { |
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613 oop type_mirror; |
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614 if (i < nptypes) type_mirror = java_dyn_MethodType::ptype(polymorphic_method_type(), i); |
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615 else type_mirror = java_dyn_MethodType::rtype(polymorphic_method_type()); |
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616 klassOop example_type = java_lang_Class::as_klassOop(type_mirror); |
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617 if (example_type == NULL) continue; |
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618 oop class_loader = Klass::cast(example_type)->class_loader(); |
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619 if (class_loader == NULL || class_loader == cur_class_loader()) continue; |
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620 cur_class_loader = Handle(THREAD, class_loader); |
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621 methodOop m = SystemDictionary::find_method_handle_invoke(name, |
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622 type, |
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623 KlassHandle(THREAD, example_type), |
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624 THREAD); |
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625 if (HAS_PENDING_EXCEPTION) { |
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626 CLEAR_PENDING_EXCEPTION; |
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627 m = NULL; |
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628 // try again with a different class loader... |
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629 } |
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630 if (m != NULL) { |
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631 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); |
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632 sun_dyn_MemberName::set_vmtarget(mname(), m); |
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633 sun_dyn_MemberName::set_vmindex(mname(), m->vtable_index()); |
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634 sun_dyn_MemberName::set_modifiers(mname(), mods); |
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635 return; |
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636 } |
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637 } |
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638 } |
710 | 639 } |
640 | |
641 // Conversely, a member name which is only initialized from JVM internals | |
642 // may have null defc, name, and type fields. | |
643 // Resolving it plants a vmtarget/vmindex in it, | |
644 // which refers directly to JVM internals. | |
645 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { | |
646 assert(sun_dyn_MemberName::is_instance(mname()), ""); | |
647 oop vmtarget = sun_dyn_MemberName::vmtarget(mname()); | |
648 int vmindex = sun_dyn_MemberName::vmindex(mname()); | |
649 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) { | |
650 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); | |
651 } | |
652 | |
653 bool have_defc = (sun_dyn_MemberName::clazz(mname()) != NULL); | |
654 bool have_name = (sun_dyn_MemberName::name(mname()) != NULL); | |
655 bool have_type = (sun_dyn_MemberName::type(mname()) != NULL); | |
656 int flags = sun_dyn_MemberName::flags(mname()); | |
657 | |
658 if (suppress != 0) { | |
659 if (suppress & _suppress_defc) have_defc = true; | |
660 if (suppress & _suppress_name) have_name = true; | |
661 if (suppress & _suppress_type) have_type = true; | |
662 } | |
663 | |
664 if (have_defc && have_name && have_type) return; // nothing needed | |
665 | |
666 switch (flags & ALL_KINDS) { | |
667 case IS_METHOD: | |
668 case IS_CONSTRUCTOR: | |
669 { | |
670 klassOop receiver_limit = NULL; | |
671 int decode_flags = 0; | |
672 methodHandle m(THREAD, decode_vmtarget(vmtarget, vmindex, NULL, | |
673 receiver_limit, decode_flags)); | |
674 if (m.is_null()) break; | |
675 if (!have_defc) { | |
676 klassOop defc = m->method_holder(); | |
677 if (receiver_limit != NULL && receiver_limit != defc | |
678 && Klass::cast(receiver_limit)->is_subtype_of(defc)) | |
679 defc = receiver_limit; | |
680 sun_dyn_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror()); | |
681 } | |
682 if (!have_name) { | |
683 //not java_lang_String::create_from_symbol; let's intern member names | |
684 Handle name = StringTable::intern(m->name(), CHECK); | |
685 sun_dyn_MemberName::set_name(mname(), name()); | |
686 } | |
687 if (!have_type) { | |
688 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); | |
689 sun_dyn_MemberName::set_type(mname(), type()); | |
690 } | |
691 return; | |
692 } | |
693 case IS_FIELD: | |
694 { | |
695 // This is taken from LinkResolver::resolve_field, sans access checks. | |
696 if (!vmtarget->is_klass()) break; | |
697 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break; | |
698 instanceKlassHandle defc(THREAD, (klassOop) vmtarget); | |
699 bool is_static = ((flags & JVM_ACC_STATIC) != 0); | |
700 fieldDescriptor fd; // find_field initializes fd if found | |
701 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) | |
702 break; // cannot expand | |
703 if (!have_defc) { | |
704 sun_dyn_MemberName::set_clazz(mname(), defc->java_mirror()); | |
705 } | |
706 if (!have_name) { | |
707 //not java_lang_String::create_from_symbol; let's intern member names | |
708 Handle name = StringTable::intern(fd.name(), CHECK); | |
709 sun_dyn_MemberName::set_name(mname(), name()); | |
710 } | |
711 if (!have_type) { | |
712 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK); | |
713 sun_dyn_MemberName::set_type(mname(), type()); | |
714 } | |
715 return; | |
716 } | |
717 } | |
718 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); | |
719 } | |
720 | |
721 int MethodHandles::find_MemberNames(klassOop k, | |
722 symbolOop name, symbolOop sig, | |
723 int mflags, klassOop caller, | |
724 int skip, objArrayOop results) { | |
725 DEBUG_ONLY(No_Safepoint_Verifier nsv); | |
726 // this code contains no safepoints! | |
727 | |
728 // %%% take caller into account! | |
729 | |
730 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1; | |
731 | |
732 int rfill = 0, rlimit = results->length(), rskip = skip; | |
733 // overflow measurement: | |
734 int overflow = 0, overflow_limit = MAX2(1000, rlimit); | |
735 | |
736 int match_flags = mflags; | |
737 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); | |
738 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); | |
739 bool local_only = !(search_superc | search_intfc); | |
740 bool classes_only = false; | |
741 | |
742 if (name != NULL) { | |
743 if (name->utf8_length() == 0) return 0; // a match is not possible | |
744 } | |
745 if (sig != NULL) { | |
746 if (sig->utf8_length() == 0) return 0; // a match is not possible | |
747 if (sig->byte_at(0) == '(') | |
748 match_flags &= ~(IS_FIELD | IS_TYPE); | |
749 else | |
750 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); | |
751 } | |
752 | |
753 if ((match_flags & IS_TYPE) != 0) { | |
754 // NYI, and Core Reflection works quite well for this query | |
755 } | |
756 | |
757 if ((match_flags & IS_FIELD) != 0) { | |
758 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { | |
759 if (name != NULL && st.name() != name) | |
760 continue; | |
761 if (sig != NULL && st.signature() != sig) | |
762 continue; | |
763 // passed the filters | |
764 if (rskip > 0) { | |
765 --rskip; | |
766 } else if (rfill < rlimit) { | |
767 oop result = results->obj_at(rfill++); | |
768 if (!sun_dyn_MemberName::is_instance(result)) | |
769 return -99; // caller bug! | |
770 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset()); | |
771 } else if (++overflow >= overflow_limit) { | |
772 match_flags = 0; break; // got tired of looking at overflow | |
773 } | |
774 } | |
775 } | |
776 | |
777 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { | |
778 // watch out for these guys: | |
779 symbolOop init_name = vmSymbols::object_initializer_name(); | |
780 symbolOop clinit_name = vmSymbols::class_initializer_name(); | |
781 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> | |
782 bool negate_name_test = false; | |
783 // fix name so that it captures the intention of IS_CONSTRUCTOR | |
784 if (!(match_flags & IS_METHOD)) { | |
785 // constructors only | |
786 if (name == NULL) { | |
787 name = init_name; | |
788 } else if (name != init_name) { | |
789 return 0; // no constructors of this method name | |
790 } | |
791 } else if (!(match_flags & IS_CONSTRUCTOR)) { | |
792 // methods only | |
793 if (name == NULL) { | |
794 name = init_name; | |
795 negate_name_test = true; // if we see the name, we *omit* the entry | |
796 } else if (name == init_name) { | |
797 return 0; // no methods of this constructor name | |
798 } | |
799 } else { | |
800 // caller will accept either sort; no need to adjust name | |
801 } | |
802 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { | |
803 methodOop m = st.method(); | |
804 symbolOop m_name = m->name(); | |
805 if (m_name == clinit_name) | |
806 continue; | |
807 if (name != NULL && ((m_name != name) ^ negate_name_test)) | |
808 continue; | |
809 if (sig != NULL && m->signature() != sig) | |
810 continue; | |
811 // passed the filters | |
812 if (rskip > 0) { | |
813 --rskip; | |
814 } else if (rfill < rlimit) { | |
815 oop result = results->obj_at(rfill++); | |
816 if (!sun_dyn_MemberName::is_instance(result)) | |
817 return -99; // caller bug! | |
818 MethodHandles::init_MemberName(result, m, true); | |
819 } else if (++overflow >= overflow_limit) { | |
820 match_flags = 0; break; // got tired of looking at overflow | |
821 } | |
822 } | |
823 } | |
824 | |
825 // return number of elements we at leasted wanted to initialize | |
826 return rfill + overflow; | |
827 } | |
828 | |
829 | |
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830 // Decode this java.lang.Class object into an instanceKlass, if possible. |
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831 // Throw IAE if not |
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832 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) { |
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833 instanceKlassHandle empty; |
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834 klassOop caller = NULL; |
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835 if (java_lang_Class::is_instance(java_mirror_oop)) { |
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836 caller = java_lang_Class::as_klassOop(java_mirror_oop); |
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837 } |
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838 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) { |
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839 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty); |
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840 } |
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841 return instanceKlassHandle(THREAD, caller); |
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842 } |
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843 |
710 | 844 |
845 | |
846 // Decode the vmtarget field of a method handle. | |
847 // Sanitize out methodOops, klassOops, and any other non-Java data. | |
848 // This is for debugging and reflection. | |
849 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) { | |
850 assert(java_dyn_MethodHandle::is_instance(mh()), "must be a MH"); | |
851 if (format == ETF_HANDLE_OR_METHOD_NAME) { | |
852 oop target = java_dyn_MethodHandle::vmtarget(mh()); | |
853 if (target == NULL) { | |
854 return NULL; // unformed MH | |
855 } | |
856 klassOop tklass = target->klass(); | |
1142 | 857 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) { |
710 | 858 return target; // target is another MH (or something else?) |
859 } | |
860 } | |
861 if (format == ETF_DIRECT_HANDLE) { | |
862 oop target = mh(); | |
863 for (;;) { | |
864 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { | |
865 return target; | |
866 } | |
867 if (!java_dyn_MethodHandle::is_instance(target)){ | |
868 return NULL; // unformed MH | |
869 } | |
870 target = java_dyn_MethodHandle::vmtarget(target); | |
871 } | |
872 } | |
873 // cases of metadata in MH.vmtarget: | |
874 // - AMH can have methodOop for static invoke with bound receiver | |
875 // - DMH can have methodOop for static invoke (on variable receiver) | |
876 // - DMH can have klassOop for dispatched (non-static) invoke | |
877 klassOop receiver_limit = NULL; | |
878 int decode_flags = 0; | |
879 methodOop m = decode_MethodHandle(mh(), receiver_limit, decode_flags); | |
880 if (m == NULL) return NULL; | |
881 switch (format) { | |
882 case ETF_REFLECT_METHOD: | |
883 // same as jni_ToReflectedMethod: | |
884 if (m->is_initializer()) { | |
885 return Reflection::new_constructor(m, THREAD); | |
886 } else { | |
887 return Reflection::new_method(m, UseNewReflection, false, THREAD); | |
888 } | |
889 | |
890 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle | |
891 case ETF_METHOD_NAME: | |
892 { | |
893 if (SystemDictionary::MemberName_klass() == NULL) break; | |
894 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass()); | |
895 mname_klass->initialize(CHECK_NULL); | |
896 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); | |
897 sun_dyn_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED); | |
898 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); | |
899 init_MemberName(mname(), m, do_dispatch); | |
900 expand_MemberName(mname, 0, CHECK_NULL); | |
901 return mname(); | |
902 } | |
903 } | |
904 | |
905 // Unknown format code. | |
906 char msg[50]; | |
907 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format); | |
908 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg); | |
909 } | |
910 | |
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911 static const char* always_null_names[] = { |
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912 "java/lang/Void", |
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913 "java/lang/Null", |
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914 //"java/lang/Nothing", |
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915 "sun/dyn/empty/Empty", |
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916 NULL |
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917 }; |
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918 |
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919 static bool is_always_null_type(klassOop klass) { |
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920 if (!Klass::cast(klass)->oop_is_instance()) return false; |
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921 instanceKlass* ik = instanceKlass::cast(klass); |
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922 // Must be on the boot class path: |
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923 if (ik->class_loader() != NULL) return false; |
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924 // Check the name. |
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925 symbolOop name = ik->name(); |
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926 for (int i = 0; ; i++) { |
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927 const char* test_name = always_null_names[i]; |
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928 if (test_name == NULL) break; |
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929 if (name->equals(test_name)) |
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930 return true; |
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931 } |
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932 return false; |
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933 } |
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934 |
710 | 935 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) { |
1142 | 936 if (src == dst || dst == SystemDictionary::Object_klass()) |
710 | 937 return false; // quickest checks |
938 Klass* srck = Klass::cast(src); | |
939 Klass* dstk = Klass::cast(dst); | |
940 if (dstk->is_interface()) { | |
941 // interface receivers can safely be viewed as untyped, | |
942 // because interface calls always include a dynamic check | |
1142 | 943 //dstk = Klass::cast(SystemDictionary::Object_klass()); |
710 | 944 return false; |
945 } | |
946 if (srck->is_interface()) { | |
947 // interface arguments must be viewed as untyped | |
1142 | 948 //srck = Klass::cast(SystemDictionary::Object_klass()); |
710 | 949 return true; |
950 } | |
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951 if (is_always_null_type(src)) { |
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952 // some source types are known to be never instantiated; |
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953 // they represent references which are always null |
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954 // such null references never fail to convert safely |
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955 return false; |
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956 } |
710 | 957 return !srck->is_subclass_of(dstk->as_klassOop()); |
958 } | |
959 | |
960 static oop object_java_mirror() { | |
1142 | 961 return Klass::cast(SystemDictionary::Object_klass())->java_mirror(); |
710 | 962 } |
963 | |
964 bool MethodHandles::same_basic_type_for_arguments(BasicType src, | |
965 BasicType dst, | |
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966 bool raw, |
710 | 967 bool for_return) { |
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968 if (for_return) { |
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969 // return values can always be forgotten: |
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970 if (dst == T_VOID) return true; |
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971 if (src == T_VOID) return raw && (dst == T_INT); |
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972 // We allow caller to receive a garbage int, which is harmless. |
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973 // This trick is pulled by trusted code (see VerifyType.canPassRaw). |
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974 } |
710 | 975 assert(src != T_VOID && dst != T_VOID, "should not be here"); |
976 if (src == dst) return true; | |
977 if (type2size[src] != type2size[dst]) return false; | |
978 // allow reinterpretation casts for integral widening | |
979 if (is_subword_type(src)) { // subwords can fit in int or other subwords | |
980 if (dst == T_INT) // any subword fits in an int | |
981 return true; | |
982 if (src == T_BOOLEAN) // boolean fits in any subword | |
983 return is_subword_type(dst); | |
984 if (src == T_BYTE && dst == T_SHORT) | |
985 return true; // remaining case: byte fits in short | |
986 } | |
987 // allow float/fixed reinterpretation casts | |
988 if (src == T_FLOAT) return dst == T_INT; | |
989 if (src == T_INT) return dst == T_FLOAT; | |
990 if (src == T_DOUBLE) return dst == T_LONG; | |
991 if (src == T_LONG) return dst == T_DOUBLE; | |
992 return false; | |
993 } | |
994 | |
995 const char* MethodHandles::check_method_receiver(methodOop m, | |
996 klassOop passed_recv_type) { | |
997 assert(!m->is_static(), "caller resp."); | |
998 if (passed_recv_type == NULL) | |
999 return "receiver type is primitive"; | |
1000 if (class_cast_needed(passed_recv_type, m->method_holder())) { | |
1001 Klass* formal = Klass::cast(m->method_holder()); | |
1002 return SharedRuntime::generate_class_cast_message("receiver type", | |
1003 formal->external_name()); | |
1004 } | |
1005 return NULL; // checks passed | |
1006 } | |
1007 | |
1008 // Verify that m's signature can be called type-safely by a method handle | |
1009 // of the given method type 'mtype'. | |
1010 // It takes a TRAPS argument because it must perform symbol lookups. | |
1011 void MethodHandles::verify_method_signature(methodHandle m, | |
1012 Handle mtype, | |
1013 int first_ptype_pos, | |
1014 KlassHandle insert_ptype, | |
1015 TRAPS) { | |
1016 objArrayHandle ptypes(THREAD, java_dyn_MethodType::ptypes(mtype())); | |
1017 int pnum = first_ptype_pos; | |
1018 int pmax = ptypes->length(); | |
1019 int mnum = 0; // method argument | |
1020 const char* err = NULL; | |
1021 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) { | |
1022 oop ptype_oop = NULL; | |
1023 if (ss.at_return_type()) { | |
1024 if (pnum != pmax) | |
1025 { err = "too many arguments"; break; } | |
1026 ptype_oop = java_dyn_MethodType::rtype(mtype()); | |
1027 } else { | |
1028 if (pnum >= pmax) | |
1029 { err = "not enough arguments"; break; } | |
1030 if (pnum >= 0) | |
1031 ptype_oop = ptypes->obj_at(pnum); | |
1032 else if (insert_ptype.is_null()) | |
1033 ptype_oop = NULL; | |
1034 else | |
1035 ptype_oop = insert_ptype->java_mirror(); | |
1036 pnum += 1; | |
1037 mnum += 1; | |
1038 } | |
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1039 klassOop pklass = NULL; |
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1040 BasicType ptype = T_OBJECT; |
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1041 if (ptype_oop != NULL) |
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1042 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass); |
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1043 else |
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1044 // null does not match any non-reference; use Object to report the error |
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1045 pklass = SystemDictionary::Object_klass(); |
710 | 1046 klassOop mklass = NULL; |
1047 BasicType mtype = ss.type(); | |
1048 if (mtype == T_ARRAY) mtype = T_OBJECT; // fold all refs to T_OBJECT | |
1049 if (mtype == T_OBJECT) { | |
1050 if (ptype_oop == NULL) { | |
1051 // null matches any reference | |
1052 continue; | |
1053 } | |
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1054 KlassHandle pklass_handle(THREAD, pklass); pklass = NULL; |
710 | 1055 // If we fail to resolve types at this point, we will throw an error. |
1056 symbolOop name_oop = ss.as_symbol(CHECK); | |
1057 symbolHandle name(THREAD, name_oop); | |
1058 instanceKlass* mk = instanceKlass::cast(m->method_holder()); | |
1059 Handle loader(THREAD, mk->class_loader()); | |
1060 Handle domain(THREAD, mk->protection_domain()); | |
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1061 mklass = SystemDictionary::resolve_or_null(name, loader, domain, CHECK); |
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1062 pklass = pklass_handle(); |
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1063 if (mklass == NULL && pklass != NULL && |
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1064 Klass::cast(pklass)->name() == name() && |
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1065 m->is_method_handle_invoke()) { |
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1066 // Assume a match. We can't really decode the signature of MH.invoke*. |
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1067 continue; |
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1068 } |
710 | 1069 } |
1070 if (!ss.at_return_type()) { | |
1071 err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum); | |
1072 } else { | |
1073 err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal! | |
1074 } | |
1075 if (err != NULL) break; | |
1076 } | |
1077 | |
1078 if (err != NULL) { | |
1079 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
1080 } | |
1081 } | |
1082 | |
1083 // Main routine for verifying the MethodHandle.type of a proposed | |
1084 // direct or bound-direct method handle. | |
1085 void MethodHandles::verify_method_type(methodHandle m, | |
1086 Handle mtype, | |
1087 bool has_bound_recv, | |
1088 KlassHandle bound_recv_type, | |
1089 TRAPS) { | |
1090 bool m_needs_receiver = !m->is_static(); | |
1091 | |
1092 const char* err = NULL; | |
1093 | |
1094 int first_ptype_pos = m_needs_receiver ? 1 : 0; | |
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1095 if (has_bound_recv) { |
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1096 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them |
710 | 1097 if (m_needs_receiver && bound_recv_type.is_null()) |
1098 { err = "bound receiver is not an object"; goto die; } | |
1099 } | |
1100 | |
1101 if (m_needs_receiver && err == NULL) { | |
1102 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype()); | |
1103 if (ptypes->length() < first_ptype_pos) | |
1104 { err = "receiver argument is missing"; goto die; } | |
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1105 if (has_bound_recv) |
710 | 1106 err = check_method_receiver(m(), bound_recv_type->as_klassOop()); |
1107 else | |
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1108 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1))); |
710 | 1109 if (err != NULL) goto die; |
1110 } | |
1111 | |
1112 // Check the other arguments for mistypes. | |
1113 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK); | |
1114 return; | |
1115 | |
1116 die: | |
1117 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
1118 } | |
1119 | |
1120 void MethodHandles::verify_vmslots(Handle mh, TRAPS) { | |
1121 // Verify vmslots. | |
1122 int check_slots = argument_slot_count(java_dyn_MethodHandle::type(mh())); | |
1123 if (java_dyn_MethodHandle::vmslots(mh()) != check_slots) { | |
1124 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH"); | |
1125 } | |
1126 } | |
1127 | |
1128 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) { | |
1129 // Verify that argslot points at the given argnum. | |
1130 int check_slot = argument_slot(java_dyn_MethodHandle::type(mh()), argnum); | |
1131 if (argslot != check_slot || argslot < 0) { | |
1132 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d"; | |
1133 size_t msglen = strlen(fmt) + 3*11 + 1; | |
1134 char* msg = NEW_RESOURCE_ARRAY(char, msglen); | |
1135 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot); | |
1136 THROW_MSG(vmSymbols::java_lang_InternalError(), msg); | |
1137 } | |
1138 } | |
1139 | |
1140 // Verify the correspondence between two method types. | |
1141 // Apart from the advertised changes, caller method type X must | |
1142 // be able to invoke the callee method Y type with no violations | |
1143 // of type integrity. | |
1144 // Return NULL if all is well, else a short error message. | |
1145 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end, | |
1146 int insert_argnum, oop insert_type, | |
1147 int change_argnum, oop change_type, | |
1148 int delete_argnum, | |
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1149 oop dst_mtype, int dst_beg, int dst_end, |
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1150 bool raw) { |
710 | 1151 objArrayOop src_ptypes = java_dyn_MethodType::ptypes(src_mtype); |
1152 objArrayOop dst_ptypes = java_dyn_MethodType::ptypes(dst_mtype); | |
1153 | |
1154 int src_max = src_ptypes->length(); | |
1155 int dst_max = dst_ptypes->length(); | |
1156 | |
1157 if (src_end == -1) src_end = src_max; | |
1158 if (dst_end == -1) dst_end = dst_max; | |
1159 | |
1160 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob"); | |
1161 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob"); | |
1162 | |
1163 // pending actions; set to -1 when done: | |
1164 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum; | |
1165 | |
1166 const char* err = NULL; | |
1167 | |
1168 // Walk along each array of parameter types, including a virtual | |
1169 // NULL end marker at the end of each. | |
1170 for (int src_idx = src_beg, dst_idx = dst_beg; | |
1171 (src_idx <= src_end && dst_idx <= dst_end); | |
1172 src_idx++, dst_idx++) { | |
1173 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx); | |
1174 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx); | |
1175 bool fix_null_src_type = false; | |
1176 | |
1177 // Perform requested edits. | |
1178 if (ins_idx == src_idx) { | |
1179 // note that the inserted guy is never affected by a change or deletion | |
1180 ins_idx = -1; | |
1181 src_type = insert_type; | |
1182 fix_null_src_type = true; | |
1183 --src_idx; // back up to process src type on next loop | |
1184 src_idx = src_end; | |
1185 } else { | |
1186 // note that the changed guy can be immediately deleted | |
1187 if (chg_idx == src_idx) { | |
1188 chg_idx = -1; | |
1189 assert(src_idx < src_end, "oob"); | |
1190 src_type = change_type; | |
1191 fix_null_src_type = true; | |
1192 } | |
1193 if (del_idx == src_idx) { | |
1194 del_idx = -1; | |
1195 assert(src_idx < src_end, "oob"); | |
1196 --dst_idx; | |
1197 continue; // rerun loop after skipping this position | |
1198 } | |
1199 } | |
1200 | |
1201 if (src_type == NULL && fix_null_src_type) | |
1202 // explicit null in this case matches any dest reference | |
1203 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type); | |
1204 | |
1205 // Compare the two argument types. | |
1206 if (src_type != dst_type) { | |
1207 if (src_type == NULL) return "not enough arguments"; | |
1208 if (dst_type == NULL) return "too many arguments"; | |
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1209 err = check_argument_type_change(src_type, dst_type, dst_idx, raw); |
710 | 1210 if (err != NULL) return err; |
1211 } | |
1212 } | |
1213 | |
1214 // Now compare return types also. | |
1215 oop src_rtype = java_dyn_MethodType::rtype(src_mtype); | |
1216 oop dst_rtype = java_dyn_MethodType::rtype(dst_mtype); | |
1217 if (src_rtype != dst_rtype) { | |
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1218 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal! |
710 | 1219 if (err != NULL) return err; |
1220 } | |
1221 | |
1222 assert(err == NULL, ""); | |
1223 return NULL; // all is well | |
1224 } | |
1225 | |
1226 | |
1227 const char* MethodHandles::check_argument_type_change(BasicType src_type, | |
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1228 klassOop src_klass, |
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1229 BasicType dst_type, |
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1230 klassOop dst_klass, |
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1231 int argnum, |
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1232 bool raw) { |
710 | 1233 const char* err = NULL; |
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1234 bool for_return = (argnum < 0); |
710 | 1235 |
1236 // just in case: | |
1237 if (src_type == T_ARRAY) src_type = T_OBJECT; | |
1238 if (dst_type == T_ARRAY) dst_type = T_OBJECT; | |
1239 | |
1240 // Produce some nice messages if VerifyMethodHandles is turned on: | |
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1241 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) { |
710 | 1242 if (src_type == T_OBJECT) { |
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1243 if (raw && dst_type == T_INT && is_always_null_type(src_klass)) |
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1244 return NULL; // OK to convert a null pointer to a garbage int |
710 | 1245 err = ((argnum >= 0) |
1246 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s" | |
1247 : "type mismatch: returning a %s, but caller expects primitive %s"); | |
1248 } else if (dst_type == T_OBJECT) { | |
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1249 err = ((argnum >= 0) |
710 | 1250 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s" |
1251 : "type mismatch: returning a primitive %s, but caller expects %s"); | |
1252 } else { | |
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1253 err = ((argnum >= 0) |
710 | 1254 ? "type mismatch: passing a %s for method argument #%d, which expects %s" |
1255 : "type mismatch: returning a %s, but caller expects %s"); | |
1256 } | |
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1257 } else if (src_type == T_OBJECT && dst_type == T_OBJECT && |
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1258 class_cast_needed(src_klass, dst_klass)) { |
710 | 1259 if (!class_cast_needed(dst_klass, src_klass)) { |
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1260 if (raw) |
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1261 return NULL; // reverse cast is OK; the MH target is trusted to enforce it |
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1262 err = ((argnum >= 0) |
710 | 1263 ? "cast required: passing a %s for method argument #%d, which expects %s" |
1264 : "cast required: returning a %s, but caller expects %s"); | |
1265 } else { | |
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1266 err = ((argnum >= 0) |
710 | 1267 ? "reference mismatch: passing a %s for method argument #%d, which expects %s" |
1268 : "reference mismatch: returning a %s, but caller expects %s"); | |
1269 } | |
1270 } else { | |
1271 // passed the obstacle course | |
1272 return NULL; | |
1273 } | |
1274 | |
1275 // format, format, format | |
1276 const char* src_name = type2name(src_type); | |
1277 const char* dst_name = type2name(dst_type); | |
1278 if (src_type == T_OBJECT) src_name = Klass::cast(src_klass)->external_name(); | |
1279 if (dst_type == T_OBJECT) dst_name = Klass::cast(dst_klass)->external_name(); | |
1280 if (src_name == NULL) src_name = "unknown type"; | |
1281 if (dst_name == NULL) dst_name = "unknown type"; | |
1282 | |
1283 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11); | |
1284 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1); | |
1285 if (argnum >= 0) { | |
1286 assert(strstr(err, "%d") != NULL, ""); | |
1287 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name); | |
1288 } else { | |
1289 assert(strstr(err, "%d") == NULL, ""); | |
1290 jio_snprintf(msg, msglen, err, src_name, dst_name); | |
1291 } | |
1292 return msg; | |
1293 } | |
1294 | |
1295 // Compute the depth within the stack of the given argument, i.e., | |
1296 // the combined size of arguments to the right of the given argument. | |
1297 // For the last argument (ptypes.length-1) this will be zero. | |
1298 // For the first argument (0) this will be the size of all | |
1299 // arguments but that one. For the special number -1, this | |
1300 // will be the size of all arguments, including the first. | |
1301 // If the argument is neither -1 nor a valid argument index, | |
1302 // then return a negative number. Otherwise, the result | |
1303 // is in the range [0..vmslots] inclusive. | |
1304 int MethodHandles::argument_slot(oop method_type, int arg) { | |
1305 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); | |
1306 int argslot = 0; | |
1307 int len = ptypes->length(); | |
1308 if (arg < -1 || arg >= len) return -99; | |
1309 for (int i = len-1; i > arg; i--) { | |
1310 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); | |
1311 argslot += type2size[bt]; | |
1312 } | |
1313 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works"); | |
1314 return argslot; | |
1315 } | |
1316 | |
1317 // Given a slot number, return the argument number. | |
1318 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) { | |
1319 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); | |
1320 int argslot = 0; | |
1321 int len = ptypes->length(); | |
1322 for (int i = len-1; i >= 0; i--) { | |
1323 if (query_argslot == argslot) return i; | |
1324 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); | |
1325 argslot += type2size[bt]; | |
1326 } | |
1327 // return pseudo-arg deepest in stack: | |
1328 if (query_argslot == argslot) return -1; | |
1329 return -99; // oob slot, or splitting a double-slot arg | |
1330 } | |
1331 | |
1332 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m, | |
1333 KlassHandle receiver_limit, | |
1334 int decode_flags, | |
1335 KlassHandle receiver_klass, | |
1336 TRAPS) { | |
1337 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference"); | |
1338 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument"); | |
1339 | |
1340 if (!m->is_static() && | |
1341 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder()))) | |
1342 // given type does not match class of method, or receiver is null! | |
1343 // caller should have checked this, but let's be extra careful... | |
1344 return methodHandle(); | |
1345 | |
1346 if (receiver_limit.not_null() && | |
1347 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit()))) | |
1348 // given type is not limited to the receiver type | |
1349 // note that a null receiver can match any reference value, for a static method | |
1350 return methodHandle(); | |
1351 | |
1352 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) { | |
1353 // pre-dispatched or static method (null receiver is OK for static) | |
1354 return m; | |
1355 | |
1356 } else if (receiver_klass.is_null()) { | |
1357 // null receiver value; cannot dispatch | |
1358 return methodHandle(); | |
1359 | |
1360 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) { | |
1361 // perform virtual dispatch | |
1362 int vtable_index = m->vtable_index(); | |
1363 guarantee(vtable_index >= 0, "valid vtable index"); | |
1364 | |
1365 // receiver_klass might be an arrayKlassOop but all vtables start at | |
1366 // the same place. The cast is to avoid virtual call and assertion. | |
1367 // See also LinkResolver::runtime_resolve_virtual_method. | |
1368 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass()); | |
1369 DEBUG_ONLY(inst->verify_vtable_index(vtable_index)); | |
1370 methodOop m_oop = inst->method_at_vtable(vtable_index); | |
1371 return methodHandle(THREAD, m_oop); | |
1372 | |
1373 } else { | |
1374 // perform interface dispatch | |
1375 int itable_index = klassItable::compute_itable_index(m()); | |
1376 guarantee(itable_index >= 0, "valid itable index"); | |
1377 instanceKlass* inst = instanceKlass::cast(receiver_klass()); | |
1378 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD); | |
1379 return methodHandle(THREAD, m_oop); | |
1380 } | |
1381 } | |
1382 | |
1383 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) { | |
1384 // Verify type. | |
1385 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1386 verify_method_type(m, mtype, false, KlassHandle(), CHECK); | |
1387 | |
1388 // Verify vmslots. | |
1389 if (java_dyn_MethodHandle::vmslots(mh()) != m->size_of_parameters()) { | |
1390 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH"); | |
1391 } | |
1392 } | |
1393 | |
1394 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) { | |
1395 // Check arguments. | |
1396 if (mh.is_null() || m.is_null() || | |
1397 (!do_dispatch && m->is_abstract())) { | |
1398 THROW(vmSymbols::java_lang_InternalError()); | |
1399 } | |
1400 | |
1401 java_dyn_MethodHandle::init_vmslots(mh()); | |
1402 | |
1403 if (VerifyMethodHandles) { | |
1404 // The privileged code which invokes this routine should not make | |
1405 // a mistake about types, but it's better to verify. | |
1406 verify_DirectMethodHandle(mh, m, CHECK); | |
1407 } | |
1408 | |
1409 // Finally, after safety checks are done, link to the target method. | |
1410 // We will follow the same path as the latter part of | |
1411 // InterpreterRuntime::resolve_invoke(), which first finds the method | |
1412 // and then decides how to populate the constant pool cache entry | |
1413 // that links the interpreter calls to the method. We need the same | |
1414 // bits, and will use the same calling sequence code. | |
1415 | |
1416 int vmindex = methodOopDesc::garbage_vtable_index; | |
1417 oop vmtarget = NULL; | |
1418 | |
1419 instanceKlass::cast(m->method_holder())->link_class(CHECK); | |
1420 | |
1421 MethodHandleEntry* me = NULL; | |
1422 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) { | |
1423 // We are simulating an invokeinterface instruction. | |
1424 // (We might also be simulating an invokevirtual on a miranda method, | |
1425 // but it is safe to treat it as an invokeinterface.) | |
1426 assert(!m->can_be_statically_bound(), "no final methods on interfaces"); | |
1427 vmindex = klassItable::compute_itable_index(m()); | |
1428 assert(vmindex >= 0, "(>=0) == do_dispatch"); | |
1429 // Set up same bits as ConstantPoolCacheEntry::set_interface_call(). | |
1430 vmtarget = m->method_holder(); // the interface | |
1431 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh); | |
1432 } else if (!do_dispatch || m->can_be_statically_bound()) { | |
1433 // We are simulating an invokestatic or invokespecial instruction. | |
1434 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method(). | |
1435 vmtarget = m(); | |
1436 // this does not help dispatch, but it will make it possible to parse this MH: | |
1437 vmindex = methodOopDesc::nonvirtual_vtable_index; | |
1438 assert(vmindex < 0, "(>=0) == do_dispatch"); | |
1439 if (!m->is_static()) { | |
1440 me = MethodHandles::entry(MethodHandles::_invokespecial_mh); | |
1441 } else { | |
1442 me = MethodHandles::entry(MethodHandles::_invokestatic_mh); | |
1443 // Part of the semantics of a static call is an initialization barrier. | |
1444 // For a DMH, it is done now, when the handle is created. | |
1445 Klass* k = Klass::cast(m->method_holder()); | |
1446 if (k->should_be_initialized()) { | |
1447 k->initialize(CHECK); | |
1448 } | |
1449 } | |
1450 } else { | |
1451 // We are simulating an invokevirtual instruction. | |
1452 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method(). | |
1453 // The key logic is LinkResolver::runtime_resolve_virtual_method. | |
1454 vmindex = m->vtable_index(); | |
1455 vmtarget = m->method_holder(); | |
1456 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh); | |
1457 } | |
1458 | |
1459 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
1460 | |
1461 sun_dyn_DirectMethodHandle::set_vmtarget(mh(), vmtarget); | |
1462 sun_dyn_DirectMethodHandle::set_vmindex(mh(), vmindex); | |
1463 DEBUG_ONLY(int flags; klassOop rlimit); | |
1464 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(), | |
1465 "properly stored for later decoding"); | |
1466 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0)); | |
1467 assert(!(actual_do_dispatch && !do_dispatch), | |
1468 "do not perform dispatch if !do_dispatch specified"); | |
1469 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch"); | |
1470 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack"); | |
1471 | |
1472 // Done! | |
1473 java_dyn_MethodHandle::set_vmentry(mh(), me); | |
1474 } | |
1475 | |
1476 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh, | |
1477 methodHandle m, | |
1478 TRAPS) { | |
1479 // Verify type. | |
1480 oop receiver = sun_dyn_BoundMethodHandle::argument(mh()); | |
1481 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1482 KlassHandle bound_recv_type; | |
1483 if (receiver != NULL) bound_recv_type = KlassHandle(THREAD, receiver->klass()); | |
1484 verify_method_type(m, mtype, true, bound_recv_type, CHECK); | |
1485 | |
1486 int receiver_pos = m->size_of_parameters() - 1; | |
1487 | |
1488 // Verify MH.vmargslot, which should point at the bound receiver. | |
1489 verify_vmargslot(mh, -1, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); | |
1490 //verify_vmslots(mh, CHECK); | |
1491 | |
1492 // Verify vmslots. | |
1493 if (java_dyn_MethodHandle::vmslots(mh()) != receiver_pos) { | |
1494 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)"); | |
1495 } | |
1496 } | |
1497 | |
1498 // Initialize a BMH with a receiver bound directly to a methodOop. | |
1499 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh, | |
1500 methodHandle original_m, | |
1501 KlassHandle receiver_limit, | |
1502 int decode_flags, | |
1503 TRAPS) { | |
1504 // Check arguments. | |
1505 if (mh.is_null() || original_m.is_null()) { | |
1506 THROW(vmSymbols::java_lang_InternalError()); | |
1507 } | |
1508 | |
1509 KlassHandle receiver_klass; | |
1510 { | |
1511 oop receiver_oop = sun_dyn_BoundMethodHandle::argument(mh()); | |
1512 if (receiver_oop != NULL) | |
1513 receiver_klass = KlassHandle(THREAD, receiver_oop->klass()); | |
1514 } | |
1515 methodHandle m = dispatch_decoded_method(original_m, | |
1516 receiver_limit, decode_flags, | |
1517 receiver_klass, | |
1518 CHECK); | |
1519 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); } | |
1520 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); } | |
1521 | |
1522 java_dyn_MethodHandle::init_vmslots(mh()); | |
1523 | |
1524 if (VerifyMethodHandles) { | |
1525 verify_BoundMethodHandle_with_receiver(mh, m, CHECK); | |
1526 } | |
1527 | |
1528 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); | |
1529 | |
1530 DEBUG_ONLY(int junk; klassOop junk2); | |
1531 assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding"); | |
1532 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot"); | |
1533 | |
1534 // Done! | |
1535 java_dyn_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh)); | |
1536 } | |
1537 | |
1538 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum, | |
1539 bool direct_to_method, TRAPS) { | |
1540 Handle ptype_handle(THREAD, | |
1541 java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum)); | |
1542 KlassHandle ptype_klass; | |
1543 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass); | |
1544 int slots_pushed = type2size[ptype]; | |
1545 | |
1546 oop argument = sun_dyn_BoundMethodHandle::argument(mh()); | |
1547 | |
1548 const char* err = NULL; | |
1549 | |
1550 switch (ptype) { | |
1551 case T_OBJECT: | |
1552 if (argument != NULL) | |
1553 // we must implicitly convert from the arg type to the outgoing ptype | |
1554 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum); | |
1555 break; | |
1556 | |
1557 case T_ARRAY: case T_VOID: | |
1558 assert(false, "array, void do not appear here"); | |
1559 default: | |
1560 if (ptype != T_INT && !is_subword_type(ptype)) { | |
1561 err = "unexpected parameter type"; | |
1562 break; | |
1563 } | |
1564 // check subrange of Integer.value, if necessary | |
1142 | 1565 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) { |
710 | 1566 err = "bound integer argument must be of type java.lang.Integer"; |
1567 break; | |
1568 } | |
1569 if (ptype != T_INT) { | |
1570 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT); | |
1571 jint value = argument->int_field(value_offset); | |
1572 int vminfo = adapter_subword_vminfo(ptype); | |
1573 jint subword = truncate_subword_from_vminfo(value, vminfo); | |
1574 if (value != subword) { | |
1575 err = "bound subword value does not fit into the subword type"; | |
1576 break; | |
1577 } | |
1578 } | |
1579 break; | |
1580 case T_FLOAT: | |
1581 case T_DOUBLE: | |
1582 case T_LONG: | |
1583 { | |
1584 // we must implicitly convert from the unboxed arg type to the outgoing ptype | |
1585 BasicType argbox = java_lang_boxing_object::basic_type(argument); | |
1586 if (argbox != ptype) { | |
1587 err = check_argument_type_change(T_OBJECT, (argument == NULL | |
1142 | 1588 ? SystemDictionary::Object_klass() |
710 | 1589 : argument->klass()), |
1590 ptype, ptype_klass(), argnum); | |
1591 assert(err != NULL, "this must be an error"); | |
1592 } | |
1593 break; | |
1594 } | |
1595 } | |
1596 | |
1597 if (err == NULL) { | |
1598 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); | |
1599 if (direct_to_method) { | |
1600 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots"); | |
1601 assert(slots_pushed <= MethodHandlePushLimit, ""); | |
1602 } else { | |
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1603 int target_pushes = decode_MethodHandle_stack_pushes(target()); |
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1604 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct"); |
710 | 1605 // do not blow the stack; use a Java-based adapter if this limit is exceeded |
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1606 // FIXME |
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1607 // if (slots_pushed + target_pushes > MethodHandlePushLimit) |
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1608 // err = "too many bound parameters"; |
710 | 1609 } |
1610 } | |
1611 | |
1612 if (err == NULL) { | |
1613 // Verify the rest of the method type. | |
1614 err = check_method_type_insertion(java_dyn_MethodHandle::type(mh()), | |
1615 argnum, ptype_handle(), | |
1616 java_dyn_MethodHandle::type(target())); | |
1617 } | |
1618 | |
1619 if (err != NULL) { | |
1620 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
1621 } | |
1622 } | |
1623 | |
1624 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { | |
1625 // Check arguments. | |
1626 if (mh.is_null() || target.is_null() || !java_dyn_MethodHandle::is_instance(target())) { | |
1627 THROW(vmSymbols::java_lang_InternalError()); | |
1628 } | |
1629 | |
1630 java_dyn_MethodHandle::init_vmslots(mh()); | |
1631 | |
1632 if (VerifyMethodHandles) { | |
1633 int insert_after = argnum - 1; | |
1634 verify_vmargslot(mh, insert_after, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); | |
1635 verify_vmslots(mh, CHECK); | |
1636 } | |
1637 | |
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1638 // Get bound type and required slots. |
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1639 oop ptype_oop = java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum); |
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1640 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop); |
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1641 int slots_pushed = type2size[ptype]; |
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1642 |
710 | 1643 // If (a) the target is a direct non-dispatched method handle, |
1644 // or (b) the target is a dispatched direct method handle and we | |
1645 // are binding the receiver, cut out the middle-man. | |
1646 // Do this by decoding the DMH and using its methodOop directly as vmtarget. | |
1647 bool direct_to_method = false; | |
1648 if (OptimizeMethodHandles && | |
1649 target->klass() == SystemDictionary::DirectMethodHandle_klass() && | |
1650 (argnum == 0 || sun_dyn_DirectMethodHandle::vmindex(target()) < 0)) { | |
1651 int decode_flags = 0; klassOop receiver_limit_oop = NULL; | |
1652 methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags)); | |
1653 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); } | |
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1654 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg. |
710 | 1655 assert(sun_dyn_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig"); |
1656 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) { | |
1657 KlassHandle receiver_limit(THREAD, receiver_limit_oop); | |
1658 init_BoundMethodHandle_with_receiver(mh, m, | |
1659 receiver_limit, decode_flags, | |
1660 CHECK); | |
1661 return; | |
1662 } | |
1663 | |
1664 // Even if it is not a bound receiver, we still might be able | |
1665 // to bind another argument and still invoke the methodOop directly. | |
1666 if (!(decode_flags & _dmf_does_dispatch)) { | |
1667 direct_to_method = true; | |
1668 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); | |
1669 } | |
1670 } | |
1671 if (!direct_to_method) | |
1672 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), target()); | |
1673 | |
1674 if (VerifyMethodHandles) { | |
1675 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK); | |
1676 } | |
1677 | |
1678 // Next question: Is this a ref, int, or long bound value? | |
1679 MethodHandleEntry* me = NULL; | |
1680 if (ptype == T_OBJECT) { | |
1681 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh); | |
1682 else me = MethodHandles::entry(_bound_ref_mh); | |
1683 } else if (slots_pushed == 2) { | |
1684 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh); | |
1685 else me = MethodHandles::entry(_bound_long_mh); | |
1686 } else if (slots_pushed == 1) { | |
1687 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh); | |
1688 else me = MethodHandles::entry(_bound_int_mh); | |
1689 } else { | |
1690 assert(false, ""); | |
1691 } | |
1692 | |
1693 // Done! | |
1694 java_dyn_MethodHandle::set_vmentry(mh(), me); | |
1695 } | |
1696 | |
1697 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) { | |
1698 char msg[200]; | |
1699 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err); | |
1700 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg); | |
1701 } | |
1702 | |
1703 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) { | |
1704 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); | |
1705 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); | |
1706 | |
1707 verify_vmargslot(mh, argnum, argslot, CHECK); | |
1708 verify_vmslots(mh, CHECK); | |
1709 | |
1710 jint conv_op = adapter_conversion_op(conversion); | |
1711 if (!conv_op_valid(conv_op)) { | |
1712 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD); | |
1713 return; | |
1714 } | |
1715 EntryKind ek = adapter_entry_kind(conv_op); | |
1716 | |
1717 int stack_move = adapter_conversion_stack_move(conversion); | |
1718 BasicType src = adapter_conversion_src_type(conversion); | |
1719 BasicType dest = adapter_conversion_dest_type(conversion); | |
1720 int vminfo = adapter_conversion_vminfo(conversion); // should be zero | |
1721 | |
1722 Handle argument(THREAD, sun_dyn_AdapterMethodHandle::argument(mh())); | |
1723 Handle target(THREAD, sun_dyn_AdapterMethodHandle::vmtarget(mh())); | |
1724 Handle src_mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1725 Handle dst_mtype(THREAD, java_dyn_MethodHandle::type(target())); | |
1726 | |
1727 const char* err = NULL; | |
1728 | |
1729 if (err == NULL) { | |
1730 // Check that the correct argument is supplied, but only if it is required. | |
1731 switch (ek) { | |
1732 case _adapter_check_cast: // target type of cast | |
1733 case _adapter_ref_to_prim: // wrapper type from which to unbox | |
1734 case _adapter_prim_to_ref: // wrapper type to box into | |
1735 case _adapter_collect_args: // array type to collect into | |
1736 case _adapter_spread_args: // array type to spread from | |
1737 if (!java_lang_Class::is_instance(argument()) | |
1738 || java_lang_Class::is_primitive(argument())) | |
1739 { err = "adapter requires argument of type java.lang.Class"; break; } | |
1740 if (ek == _adapter_collect_args || | |
1741 ek == _adapter_spread_args) { | |
1742 // Make sure it is a suitable collection type. (Array, for now.) | |
1743 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument())); | |
1744 if (!ak->oop_is_objArray()) { | |
1745 { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; } | |
1746 } | |
1747 } | |
1748 break; | |
1749 case _adapter_flyby: | |
1750 case _adapter_ricochet: | |
1751 if (!java_dyn_MethodHandle::is_instance(argument())) | |
1752 { err = "MethodHandle adapter argument required"; break; } | |
1753 break; | |
1754 default: | |
1755 if (argument.not_null()) | |
1756 { err = "adapter has spurious argument"; break; } | |
1757 break; | |
1758 } | |
1759 } | |
1760 | |
1761 if (err == NULL) { | |
1762 // Check that the src/dest types are supplied if needed. | |
1763 switch (ek) { | |
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1764 case _adapter_check_cast: |
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1765 if (src != T_OBJECT || dest != T_OBJECT) { |
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1766 err = "adapter requires object src/dest conversion subfields"; |
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1767 } |
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1768 break; |
710 | 1769 case _adapter_prim_to_prim: |
1770 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) { | |
1771 err = "adapter requires primitive src/dest conversion subfields"; break; | |
1772 } | |
1773 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) || | |
1774 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) { | |
1775 err = "adapter cannot convert beween floating and fixed-point"; break; | |
1776 } | |
1777 break; | |
1778 case _adapter_ref_to_prim: | |
1779 if (src != T_OBJECT || !is_java_primitive(dest) | |
1780 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) { | |
1781 err = "adapter requires primitive dest conversion subfield"; break; | |
1782 } | |
1783 break; | |
1784 case _adapter_prim_to_ref: | |
1785 if (!is_java_primitive(src) || dest != T_OBJECT | |
1786 || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) { | |
1787 err = "adapter requires primitive src conversion subfield"; break; | |
1788 } | |
1789 break; | |
1790 case _adapter_swap_args: | |
1791 case _adapter_rot_args: | |
1792 { | |
1793 if (!src || src != dest) { | |
1794 err = "adapter requires src/dest conversion subfields for swap"; break; | |
1795 } | |
1796 int swap_size = type2size[src]; | |
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1797 oop src_mtype = sun_dyn_AdapterMethodHandle::type(mh()); |
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1798 oop dest_mtype = sun_dyn_AdapterMethodHandle::type(target()); |
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1799 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(target()); |
710 | 1800 int src_slot = argslot; |
1801 int dest_slot = vminfo; | |
1802 bool rotate_up = (src_slot > dest_slot); // upward rotation | |
1803 int src_arg = argnum; | |
1804 int dest_arg = argument_slot_to_argnum(dest_mtype, dest_slot); | |
1805 verify_vmargslot(mh, dest_arg, dest_slot, CHECK); | |
1806 if (!(dest_slot >= src_slot + swap_size) && | |
1807 !(src_slot >= dest_slot + swap_size)) { | |
1808 err = "source, destination slots must be distinct"; | |
1809 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) { | |
1810 err = "source of swap must be deeper in stack"; | |
1811 } else if (ek == _adapter_swap_args) { | |
1812 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, dest_arg), | |
1813 java_dyn_MethodType::ptype(dest_mtype, src_arg), | |
1814 dest_arg); | |
1815 } else if (ek == _adapter_rot_args) { | |
1816 if (rotate_up) { | |
1817 assert((src_slot > dest_slot) && (src_arg < dest_arg), ""); | |
1818 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot] | |
1819 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1] | |
1820 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) { | |
1821 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), | |
1822 java_dyn_MethodType::ptype(dest_mtype, i-1), | |
1823 i); | |
1824 } | |
1825 } else { // rotate down | |
1826 assert((src_slot < dest_slot) && (src_arg > dest_arg), ""); | |
1827 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss] | |
1828 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg] | |
1829 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) { | |
1830 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), | |
1831 java_dyn_MethodType::ptype(dest_mtype, i+1), | |
1832 i); | |
1833 } | |
1834 } | |
1835 } | |
1836 if (err == NULL) | |
1837 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, src_arg), | |
1838 java_dyn_MethodType::ptype(dest_mtype, dest_arg), | |
1839 src_arg); | |
1840 } | |
1841 break; | |
1842 case _adapter_collect_args: | |
1843 case _adapter_spread_args: | |
1844 { | |
1845 BasicType coll_type = (ek == _adapter_collect_args) ? dest : src; | |
1846 BasicType elem_type = (ek == _adapter_collect_args) ? src : dest; | |
1847 if (coll_type != T_OBJECT || elem_type != T_OBJECT) { | |
1848 err = "adapter requires src/dest subfields"; break; | |
1849 // later: | |
1850 // - consider making coll be a primitive array | |
1851 // - consider making coll be a heterogeneous collection | |
1852 } | |
1853 } | |
1854 break; | |
1855 default: | |
1856 if (src != 0 || dest != 0) { | |
1857 err = "adapter has spurious src/dest conversion subfields"; break; | |
1858 } | |
1859 break; | |
1860 } | |
1861 } | |
1862 | |
1863 if (err == NULL) { | |
1864 // Check the stack_move subfield. | |
1865 // It must always report the net change in stack size, positive or negative. | |
1866 int slots_pushed = stack_move / stack_move_unit(); | |
1867 switch (ek) { | |
1868 case _adapter_prim_to_prim: | |
1869 case _adapter_ref_to_prim: | |
1870 case _adapter_prim_to_ref: | |
1871 if (slots_pushed != type2size[dest] - type2size[src]) { | |
1872 err = "wrong stack motion for primitive conversion"; | |
1873 } | |
1874 break; | |
1875 case _adapter_dup_args: | |
1876 if (slots_pushed <= 0) { | |
1877 err = "adapter requires conversion subfield slots_pushed > 0"; | |
1878 } | |
1879 break; | |
1880 case _adapter_drop_args: | |
1881 if (slots_pushed >= 0) { | |
1882 err = "adapter requires conversion subfield slots_pushed < 0"; | |
1883 } | |
1884 break; | |
1885 case _adapter_collect_args: | |
1886 if (slots_pushed > 1) { | |
1887 err = "adapter requires conversion subfield slots_pushed <= 1"; | |
1888 } | |
1889 break; | |
1890 case _adapter_spread_args: | |
1891 if (slots_pushed < -1) { | |
1892 err = "adapter requires conversion subfield slots_pushed >= -1"; | |
1893 } | |
1894 break; | |
1895 default: | |
1896 if (stack_move != 0) { | |
1897 err = "adapter has spurious stack_move conversion subfield"; | |
1898 } | |
1899 break; | |
1900 } | |
1901 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) { | |
1902 err = "stack_move conversion subfield must be multiple of stack_move_unit"; | |
1903 } | |
1904 } | |
1905 | |
1906 if (err == NULL) { | |
1907 // Make sure this adapter does not push too deeply. | |
1908 int slots_pushed = stack_move / stack_move_unit(); | |
1909 int this_vmslots = java_dyn_MethodHandle::vmslots(mh()); | |
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1910 int target_vmslots = java_dyn_MethodHandle::vmslots(target()); |
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1911 if (slots_pushed != (target_vmslots - this_vmslots)) { |
710 | 1912 err = "stack_move inconsistent with previous and current MethodType vmslots"; |
1913 } else if (slots_pushed > 0) { | |
1914 // verify stack_move against MethodHandlePushLimit | |
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1915 int target_pushes = decode_MethodHandle_stack_pushes(target()); |
710 | 1916 // do not blow the stack; use a Java-based adapter if this limit is exceeded |
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1917 if (slots_pushed + target_pushes > MethodHandlePushLimit) { |
710 | 1918 err = "adapter pushes too many parameters"; |
1919 } | |
1920 } | |
1921 | |
1922 // While we're at it, check that the stack motion decoder works: | |
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1923 DEBUG_ONLY(int target_pushes = decode_MethodHandle_stack_pushes(target())); |
710 | 1924 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); |
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1925 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct"); |
710 | 1926 } |
1927 | |
1928 if (err == NULL && vminfo != 0) { | |
1929 switch (ek) { | |
1930 case _adapter_swap_args: | |
1931 case _adapter_rot_args: | |
1932 break; // OK | |
1933 default: | |
1934 err = "vminfo subfield is reserved to the JVM"; | |
1935 } | |
1936 } | |
1937 | |
1938 // Do additional ad hoc checks. | |
1939 if (err == NULL) { | |
1940 switch (ek) { | |
1941 case _adapter_retype_only: | |
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1942 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false); |
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1943 break; |
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1944 |
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1945 case _adapter_retype_raw: |
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1946 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true); |
710 | 1947 break; |
1948 | |
1949 case _adapter_check_cast: | |
1950 { | |
1951 // The actual value being checked must be a reference: | |
1952 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype(), argnum), | |
1953 object_java_mirror(), argnum); | |
1954 if (err != NULL) break; | |
1955 | |
1956 // The output of the cast must fit with the destination argument: | |
1957 Handle cast_class = argument; | |
1958 err = check_method_type_conversion(src_mtype(), | |
1959 argnum, cast_class(), | |
1960 dst_mtype()); | |
1961 } | |
1962 break; | |
1963 | |
1964 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles | |
1965 } | |
1966 } | |
1967 | |
1968 if (err != NULL) { | |
1969 throw_InternalError_for_bad_conversion(conversion, err, THREAD); | |
1970 return; | |
1971 } | |
1972 | |
1973 } | |
1974 | |
1975 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { | |
1976 oop argument = sun_dyn_AdapterMethodHandle::argument(mh()); | |
1977 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); | |
1978 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); | |
1979 jint conv_op = adapter_conversion_op(conversion); | |
1980 | |
1981 // adjust the adapter code to the internal EntryKind enumeration: | |
1982 EntryKind ek_orig = adapter_entry_kind(conv_op); | |
1983 EntryKind ek_opt = ek_orig; // may be optimized | |
1984 | |
1985 // Finalize the vmtarget field (Java initialized it to null). | |
1986 if (!java_dyn_MethodHandle::is_instance(target())) { | |
1987 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD); | |
1988 return; | |
1989 } | |
1990 sun_dyn_AdapterMethodHandle::set_vmtarget(mh(), target()); | |
1991 | |
1992 if (VerifyMethodHandles) { | |
1993 verify_AdapterMethodHandle(mh, argnum, CHECK); | |
1994 } | |
1995 | |
1996 int stack_move = adapter_conversion_stack_move(conversion); | |
1997 BasicType src = adapter_conversion_src_type(conversion); | |
1998 BasicType dest = adapter_conversion_dest_type(conversion); | |
1999 int vminfo = adapter_conversion_vminfo(conversion); // should be zero | |
2000 | |
2001 const char* err = NULL; | |
2002 | |
2003 // Now it's time to finish the case analysis and pick a MethodHandleEntry. | |
2004 switch (ek_orig) { | |
2005 case _adapter_retype_only: | |
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2006 case _adapter_retype_raw: |
710 | 2007 case _adapter_check_cast: |
2008 case _adapter_dup_args: | |
2009 case _adapter_drop_args: | |
2010 // these work fine via general case code | |
2011 break; | |
2012 | |
2013 case _adapter_prim_to_prim: | |
2014 { | |
2015 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}. | |
2016 // And, the {float,double} -> {int,long} cases must be handled by Java. | |
2017 switch (type2size[src] *4+ type2size[dest]) { | |
2018 case 1 *4+ 1: | |
2019 assert(src == T_INT || is_subword_type(src), "source is not float"); | |
2020 // Subword-related cases are int -> {boolean,byte,char,short}. | |
2021 ek_opt = _adapter_opt_i2i; | |
2022 vminfo = adapter_subword_vminfo(dest); | |
2023 break; | |
2024 case 2 *4+ 1: | |
2025 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) { | |
2026 ek_opt = _adapter_opt_l2i; | |
2027 vminfo = adapter_subword_vminfo(dest); | |
2028 } else if (src == T_DOUBLE && dest == T_FLOAT) { | |
2029 ek_opt = _adapter_opt_d2f; | |
2030 } else { | |
2031 assert(false, ""); | |
2032 } | |
2033 break; | |
2034 case 1 *4+ 2: | |
2035 if (src == T_INT && dest == T_LONG) { | |
2036 ek_opt = _adapter_opt_i2l; | |
2037 } else if (src == T_FLOAT && dest == T_DOUBLE) { | |
2038 ek_opt = _adapter_opt_f2d; | |
2039 } else { | |
2040 assert(false, ""); | |
2041 } | |
2042 break; | |
2043 default: | |
2044 assert(false, ""); | |
2045 break; | |
2046 } | |
2047 } | |
2048 break; | |
2049 | |
2050 case _adapter_ref_to_prim: | |
2051 { | |
2052 switch (type2size[dest]) { | |
2053 case 1: | |
2054 ek_opt = _adapter_opt_unboxi; | |
2055 vminfo = adapter_subword_vminfo(dest); | |
2056 break; | |
2057 case 2: | |
2058 ek_opt = _adapter_opt_unboxl; | |
2059 break; | |
2060 default: | |
2061 assert(false, ""); | |
2062 break; | |
2063 } | |
2064 } | |
2065 break; | |
2066 | |
2067 case _adapter_prim_to_ref: | |
2068 goto throw_not_impl; // allocates, hence could block | |
2069 | |
2070 case _adapter_swap_args: | |
2071 case _adapter_rot_args: | |
2072 { | |
2073 int swap_slots = type2size[src]; | |
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2074 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(mh()); |
710 | 2075 int src_slot = argslot; |
2076 int dest_slot = vminfo; | |
2077 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1; | |
2078 switch (swap_slots) { | |
2079 case 1: | |
2080 ek_opt = (!rotate ? _adapter_opt_swap_1 : | |
2081 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down); | |
2082 break; | |
2083 case 2: | |
2084 ek_opt = (!rotate ? _adapter_opt_swap_2 : | |
2085 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down); | |
2086 break; | |
2087 default: | |
2088 assert(false, ""); | |
2089 break; | |
2090 } | |
2091 } | |
2092 break; | |
2093 | |
2094 case _adapter_collect_args: | |
2095 goto throw_not_impl; // allocates, hence could block | |
2096 | |
2097 case _adapter_spread_args: | |
2098 { | |
2099 // vminfo will be the required length of the array | |
2100 int slots_pushed = stack_move / stack_move_unit(); | |
2101 int array_size = slots_pushed + 1; | |
2102 assert(array_size >= 0, ""); | |
2103 vminfo = array_size; | |
2104 switch (array_size) { | |
2105 case 0: ek_opt = _adapter_opt_spread_0; break; | |
2106 case 1: ek_opt = _adapter_opt_spread_1; break; | |
2107 default: ek_opt = _adapter_opt_spread_more; break; | |
2108 } | |
2109 if ((vminfo & CONV_VMINFO_MASK) != vminfo) | |
2110 goto throw_not_impl; // overflow | |
2111 } | |
2112 break; | |
2113 | |
2114 case _adapter_flyby: | |
2115 case _adapter_ricochet: | |
2116 goto throw_not_impl; // runs Java code, hence could block | |
2117 | |
2118 default: | |
2119 // should have failed much earlier; must be a missing case here | |
2120 assert(false, "incomplete switch"); | |
2121 // and fall through: | |
2122 | |
2123 throw_not_impl: | |
2124 // FIXME: these adapters are NYI | |
2125 err = "adapter not yet implemented in the JVM"; | |
2126 break; | |
2127 } | |
2128 | |
2129 if (err != NULL) { | |
2130 throw_InternalError_for_bad_conversion(conversion, err, THREAD); | |
2131 return; | |
2132 } | |
2133 | |
2134 // Rebuild the conversion value; maybe parts of it were changed. | |
2135 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo); | |
2136 | |
2137 // Finalize the conversion field. (Note that it is final to Java code.) | |
2138 sun_dyn_AdapterMethodHandle::set_conversion(mh(), new_conversion); | |
2139 | |
2140 // Done! | |
2141 java_dyn_MethodHandle::set_vmentry(mh(), entry(ek_opt)); | |
2142 | |
2143 // There should be enough memory barriers on exit from native methods | |
2144 // to ensure that the MH is fully initialized to all threads before | |
2145 // Java code can publish it in global data structures. | |
2146 } | |
2147 | |
2148 // | |
2149 // Here are the native methods on sun.dyn.MethodHandleImpl. | |
2150 // They are the private interface between this JVM and the HotSpot-specific | |
2151 // Java code that implements JSR 292 method handles. | |
2152 // | |
2153 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way | |
2154 // that intrinsic (non-JNI) native methods are defined in HotSpot. | |
2155 // | |
2156 | |
2157 // direct method handles for invokestatic or invokespecial | |
2158 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller); | |
2159 JVM_ENTRY(void, MHI_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
2160 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) { | |
2161 ResourceMark rm; // for error messages | |
2162 | |
2163 // This is the guy we are initializing: | |
2164 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2165 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
2166 | |
2167 // Early returns out of this method leave the DMH in an unfinished state. | |
2168 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
2169 | |
2170 // which method are we really talking about? | |
2171 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2172 oop target_oop = JNIHandles::resolve_non_null(target_jh); | |
2173 if (sun_dyn_MemberName::is_instance(target_oop) && | |
2174 sun_dyn_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) { | |
2175 Handle mname(THREAD, target_oop); | |
2176 MethodHandles::resolve_MemberName(mname, CHECK); | |
2177 target_oop = mname(); // in case of GC | |
2178 } | |
2179 | |
2180 int decode_flags = 0; klassOop receiver_limit = NULL; | |
2181 methodHandle m(THREAD, | |
2182 MethodHandles::decode_method(target_oop, | |
2183 receiver_limit, decode_flags)); | |
2184 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); } | |
2185 | |
2186 // The trusted Java code that calls this method should already have performed | |
2187 // access checks on behalf of the given caller. But, we can verify this. | |
2188 if (VerifyMethodHandles && caller_jh != NULL) { | |
2189 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh))); | |
2190 // If this were a bytecode, the first access check would be against | |
2191 // the "reference class" mentioned in the CONSTANT_Methodref. | |
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2192 // We don't know at this point which class that was, and if we |
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2193 // check against m.method_holder we might get the wrong answer. |
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2194 // So we just make sure to handle this check when the resolution |
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2195 // happens, when we call resolve_MemberName. |
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2196 // |
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2197 // (A public class can inherit public members from private supers, |
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2198 // and it would be wrong to check access against the private super |
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2199 // if the original symbolic reference was against the public class.) |
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2200 // |
710 | 2201 // If there were a bytecode, the next step would be to lookup the method |
2202 // in the reference class, then then check the method's access bits. | |
2203 // Emulate LinkResolver::check_method_accessability. | |
2204 klassOop resolved_klass = m->method_holder(); | |
2205 if (!Reflection::verify_field_access(caller->as_klassOop(), | |
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2206 resolved_klass, resolved_klass, |
710 | 2207 m->access_flags(), |
2208 true)) { | |
2209 // %%% following cutout belongs in Reflection::verify_field_access? | |
2210 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(), | |
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2211 resolved_klass, THREAD); |
710 | 2212 if (!same_pm) { |
2213 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string()); | |
2214 } | |
2215 } | |
2216 } | |
2217 | |
2218 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK); | |
2219 } | |
2220 JVM_END | |
2221 | |
2222 // bound method handles | |
2223 JVM_ENTRY(void, MHI_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
2224 jobject target_jh, int argnum)) { | |
2225 ResourceMark rm; // for error messages | |
2226 | |
2227 // This is the guy we are initializing: | |
2228 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2229 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
2230 | |
2231 // Early returns out of this method leave the BMH in an unfinished state. | |
2232 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
2233 | |
2234 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2235 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); | |
2236 | |
2237 if (!java_dyn_MethodHandle::is_instance(target())) { | |
2238 // Target object is a reflective method. (%%% Do we need this alternate path?) | |
2239 Untested("init_BMH of non-MH"); | |
2240 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); } | |
2241 int decode_flags = 0; klassOop receiver_limit_oop = NULL; | |
2242 methodHandle m(THREAD, | |
2243 MethodHandles::decode_method(target(), | |
2244 receiver_limit_oop, | |
2245 decode_flags)); | |
2246 KlassHandle receiver_limit(THREAD, receiver_limit_oop); | |
2247 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m, | |
2248 receiver_limit, | |
2249 decode_flags, | |
2250 CHECK); | |
2251 return; | |
2252 } | |
2253 | |
2254 // Build a BMH on top of a DMH or another BMH: | |
2255 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK); | |
2256 } | |
2257 JVM_END | |
2258 | |
2259 // adapter method handles | |
2260 JVM_ENTRY(void, MHI_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
2261 jobject target_jh, int argnum)) { | |
2262 // This is the guy we are initializing: | |
2263 if (mh_jh == NULL || target_jh == NULL) { | |
2264 THROW(vmSymbols::java_lang_InternalError()); | |
2265 } | |
2266 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
2267 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); | |
2268 | |
2269 // Early returns out of this method leave the AMH in an unfinished state. | |
2270 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
2271 | |
2272 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK); | |
2273 } | |
2274 JVM_END | |
2275 | |
2276 // method type forms | |
2277 JVM_ENTRY(void, MHI_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) { | |
2278 if (erased_jh == NULL) return; | |
2279 if (TraceMethodHandles) { | |
2280 tty->print("creating MethodType form "); | |
2281 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH! | |
2282 // call Object.toString() | |
2283 symbolOop name = vmSymbols::toString_name(), sig = vmSymbols::void_string_signature(); | |
2284 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh))); | |
2285 JavaValue result(T_OBJECT); | |
1142 | 2286 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig, |
710 | 2287 &args, CHECK); |
2288 Handle str(THREAD, (oop)result.get_jobject()); | |
2289 java_lang_String::print(str, tty); | |
2290 } | |
2291 tty->cr(); | |
2292 } | |
2293 } | |
2294 JVM_END | |
2295 | |
2296 // debugging and reflection | |
2297 JVM_ENTRY(jobject, MHI_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) { | |
2298 Handle mh(THREAD, JNIHandles::resolve(mh_jh)); | |
2299 if (!java_dyn_MethodHandle::is_instance(mh())) { | |
2300 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); | |
2301 } | |
2302 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL); | |
2303 return JNIHandles::make_local(THREAD, target); | |
2304 } | |
2305 JVM_END | |
2306 | |
2307 JVM_ENTRY(jint, MHI_getConstant(JNIEnv *env, jobject igcls, jint which)) { | |
2308 switch (which) { | |
2309 case MethodHandles::GC_JVM_PUSH_LIMIT: | |
2310 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF, | |
2311 "MethodHandlePushLimit parameter must be in valid range"); | |
2312 return MethodHandlePushLimit; | |
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2313 case MethodHandles::GC_JVM_STACK_MOVE_UNIT: |
710 | 2314 // return number of words per slot, signed according to stack direction |
2315 return MethodHandles::stack_move_unit(); | |
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2316 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK: |
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2317 return MethodHandles::adapter_conversion_ops_supported_mask(); |
710 | 2318 } |
2319 return 0; | |
2320 } | |
2321 JVM_END | |
2322 | |
2323 #ifndef PRODUCT | |
2324 #define EACH_NAMED_CON(template) \ | |
2325 template(MethodHandles,GC_JVM_PUSH_LIMIT) \ | |
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2326 template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) \ |
710 | 2327 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \ |
2328 template(MethodHandles,ETF_DIRECT_HANDLE) \ | |
2329 template(MethodHandles,ETF_METHOD_NAME) \ | |
2330 template(MethodHandles,ETF_REFLECT_METHOD) \ | |
2331 template(sun_dyn_MemberName,MN_IS_METHOD) \ | |
2332 template(sun_dyn_MemberName,MN_IS_CONSTRUCTOR) \ | |
2333 template(sun_dyn_MemberName,MN_IS_FIELD) \ | |
2334 template(sun_dyn_MemberName,MN_IS_TYPE) \ | |
2335 template(sun_dyn_MemberName,MN_SEARCH_SUPERCLASSES) \ | |
2336 template(sun_dyn_MemberName,MN_SEARCH_INTERFACES) \ | |
2337 template(sun_dyn_MemberName,VM_INDEX_UNINITIALIZED) \ | |
2338 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_ONLY) \ | |
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2339 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_RAW) \ |
710 | 2340 template(sun_dyn_AdapterMethodHandle,OP_CHECK_CAST) \ |
2341 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_PRIM) \ | |
2342 template(sun_dyn_AdapterMethodHandle,OP_REF_TO_PRIM) \ | |
2343 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_REF) \ | |
2344 template(sun_dyn_AdapterMethodHandle,OP_SWAP_ARGS) \ | |
2345 template(sun_dyn_AdapterMethodHandle,OP_ROT_ARGS) \ | |
2346 template(sun_dyn_AdapterMethodHandle,OP_DUP_ARGS) \ | |
2347 template(sun_dyn_AdapterMethodHandle,OP_DROP_ARGS) \ | |
2348 template(sun_dyn_AdapterMethodHandle,OP_COLLECT_ARGS) \ | |
2349 template(sun_dyn_AdapterMethodHandle,OP_SPREAD_ARGS) \ | |
2350 template(sun_dyn_AdapterMethodHandle,OP_FLYBY) \ | |
2351 template(sun_dyn_AdapterMethodHandle,OP_RICOCHET) \ | |
2352 template(sun_dyn_AdapterMethodHandle,CONV_OP_LIMIT) \ | |
2353 template(sun_dyn_AdapterMethodHandle,CONV_OP_MASK) \ | |
2354 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_MASK) \ | |
2355 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_SHIFT) \ | |
2356 template(sun_dyn_AdapterMethodHandle,CONV_OP_SHIFT) \ | |
2357 template(sun_dyn_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \ | |
2358 template(sun_dyn_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \ | |
2359 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \ | |
2360 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \ | |
2361 /*end*/ | |
2362 | |
2363 #define ONE_PLUS(scope,value) 1+ | |
2364 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0; | |
2365 #define VALUE_COMMA(scope,value) scope::value, | |
2366 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 }; | |
2367 #define STRING_NULL(scope,value) #value "\0" | |
2368 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) }; | |
2369 | |
2370 #undef ONE_PLUS | |
2371 #undef VALUE_COMMA | |
2372 #undef STRING_NULL | |
2373 #undef EACH_NAMED_CON | |
2374 #endif | |
2375 | |
2376 JVM_ENTRY(jint, MHI_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { | |
2377 #ifndef PRODUCT | |
2378 if (which >= 0 && which < con_value_count) { | |
2379 int con = con_values[which]; | |
2380 objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh); | |
2381 if (box != NULL && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { | |
2382 const char* str = &con_names[0]; | |
2383 for (int i = 0; i < which; i++) | |
2384 str += strlen(str) + 1; // skip name and null | |
2385 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); | |
2386 box->obj_at_put(0, name); | |
2387 } | |
2388 return con; | |
2389 } | |
2390 #endif | |
2391 return 0; | |
2392 } | |
2393 JVM_END | |
2394 | |
2395 // void init(MemberName self, AccessibleObject ref) | |
2396 JVM_ENTRY(void, MHI_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { | |
2397 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2398 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
2399 oop target_oop = JNIHandles::resolve_non_null(target_jh); | |
2400 MethodHandles::init_MemberName(mname(), target_oop); | |
2401 } | |
2402 JVM_END | |
2403 | |
2404 // void expand(MemberName self) | |
2405 JVM_ENTRY(void, MHI_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { | |
2406 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2407 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
2408 MethodHandles::expand_MemberName(mname, 0, CHECK); | |
2409 } | |
2410 JVM_END | |
2411 | |
2412 // void resolve(MemberName self, Class<?> caller) | |
2413 JVM_ENTRY(void, MHI_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { | |
2414 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2415 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
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2416 |
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2417 // The trusted Java code that calls this method should already have performed |
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2418 // access checks on behalf of the given caller. But, we can verify this. |
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2419 if (VerifyMethodHandles && caller_jh != NULL) { |
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2420 klassOop reference_klass = java_lang_Class::as_klassOop(sun_dyn_MemberName::clazz(mname())); |
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2421 if (reference_klass != NULL) { |
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2422 // Emulate LinkResolver::check_klass_accessability. |
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2423 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)); |
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2424 if (!Reflection::verify_class_access(caller, |
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2425 reference_klass, |
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2426 true)) { |
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2427 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name()); |
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2428 } |
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2429 } |
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2430 } |
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2431 |
710 | 2432 MethodHandles::resolve_MemberName(mname, CHECK); |
2433 } | |
2434 JVM_END | |
2435 | |
2436 // static native int getMembers(Class<?> defc, String matchName, String matchSig, | |
2437 // int matchFlags, Class<?> caller, int skip, MemberName[] results); | |
2438 JVM_ENTRY(jint, MHI_getMembers(JNIEnv *env, jobject igcls, | |
2439 jclass clazz_jh, jstring name_jh, jstring sig_jh, | |
2440 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { | |
2441 if (clazz_jh == NULL || results_jh == NULL) return -1; | |
2442 klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)); | |
2443 | |
2444 objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh); | |
2445 if (results == NULL || !results->is_objArray()) return -1; | |
2446 | |
2447 symbolOop name = NULL, sig = NULL; | |
2448 if (name_jh != NULL) { | |
2449 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); | |
2450 if (name == NULL) return 0; // a match is not possible | |
2451 } | |
2452 if (sig_jh != NULL) { | |
2453 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); | |
2454 if (sig == NULL) return 0; // a match is not possible | |
2455 } | |
2456 | |
2457 klassOop caller = NULL; | |
2458 if (caller_jh != NULL) { | |
2459 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); | |
2460 if (!java_lang_Class::is_instance(caller_oop)) return -1; | |
2461 caller = java_lang_Class::as_klassOop(caller_oop); | |
2462 } | |
2463 | |
2464 if (name != NULL && sig != NULL && results != NULL) { | |
2465 // try a direct resolve | |
2466 // %%% TO DO | |
2467 } | |
2468 | |
2469 int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags, | |
2470 caller, skip, results); | |
2471 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks | |
2472 return res; | |
2473 } | |
2474 JVM_END | |
2475 | |
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2476 JVM_ENTRY(void, MHI_registerBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh, jobject bsm_jh)) { |
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2477 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD); |
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2478 if (!AllowTransitionalJSR292) { |
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2479 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), |
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2480 "registerBootstrapMethod is only supported in JSR 292 EDR"); |
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2481 } |
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2482 ik->link_class(CHECK); |
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2483 if (!java_dyn_MethodHandle::is_instance(JNIHandles::resolve(bsm_jh))) { |
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2484 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "method handle"); |
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2485 } |
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2486 const char* err = NULL; |
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2487 if (ik->is_initialized() || ik->is_in_error_state()) { |
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2488 err = "too late: class is already initialized"; |
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2489 } else { |
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2490 ObjectLocker ol(ik, THREAD); // note: this should be a recursive lock |
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2491 if (ik->is_not_initialized() || |
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2492 (ik->is_being_initialized() && ik->is_reentrant_initialization(THREAD))) { |
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2493 if (ik->bootstrap_method() != NULL) { |
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2494 err = "class is already equipped with a bootstrap method"; |
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2495 } else { |
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2496 ik->set_bootstrap_method(JNIHandles::resolve_non_null(bsm_jh)); |
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2497 err = NULL; |
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2498 } |
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2499 } else { |
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2500 err = "class is already initialized"; |
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2501 if (ik->is_being_initialized()) |
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2502 err = "class is already being initialized in a different thread"; |
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2503 } |
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2504 } |
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2505 if (err != NULL) { |
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2506 THROW_MSG(vmSymbols::java_lang_IllegalStateException(), err); |
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2507 } |
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2508 } |
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2509 JVM_END |
710 | 2510 |
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2511 JVM_ENTRY(jobject, MHI_getBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh)) { |
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2512 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD); |
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2513 return JNIHandles::make_local(THREAD, ik->bootstrap_method()); |
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2514 } |
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2515 JVM_END |
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2516 |
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2517 JVM_ENTRY(void, MHI_setCallSiteTarget(JNIEnv *env, jobject igcls, jobject site_jh, jobject target_jh)) { |
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2518 // No special action required, yet. |
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2519 oop site_oop = JNIHandles::resolve(site_jh); |
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2520 if (!java_dyn_CallSite::is_instance(site_oop)) |
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2521 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "not a CallSite"); |
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2522 java_dyn_CallSite::set_target(site_oop, JNIHandles::resolve(target_jh)); |
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2523 } |
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2524 JVM_END |
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2525 |
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2526 |
710 | 2527 /// JVM_RegisterMethodHandleMethods |
2528 | |
2529 #define ADR "J" | |
2530 | |
2531 #define LANG "Ljava/lang/" | |
2532 #define JDYN "Ljava/dyn/" | |
2533 #define IDYN "Lsun/dyn/" | |
2534 | |
2535 #define OBJ LANG"Object;" | |
2536 #define CLS LANG"Class;" | |
2537 #define STRG LANG"String;" | |
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2538 #define CST JDYN"CallSite;" |
710 | 2539 #define MT JDYN"MethodType;" |
2540 #define MH JDYN"MethodHandle;" | |
2541 #define MHI IDYN"MethodHandleImpl;" | |
2542 #define MEM IDYN"MemberName;" | |
2543 #define AMH IDYN"AdapterMethodHandle;" | |
2544 #define BMH IDYN"BoundMethodHandle;" | |
2545 #define DMH IDYN"DirectMethodHandle;" | |
2546 | |
2547 #define CC (char*) /*cast a literal from (const char*)*/ | |
2548 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) | |
2549 | |
2550 // These are the native methods on sun.dyn.MethodHandleNatives. | |
2551 static JNINativeMethod methods[] = { | |
2552 // void init(MemberName self, AccessibleObject ref) | |
2553 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHI_init_AMH)}, | |
2554 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHI_init_BMH)}, | |
2555 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHI_init_DMH)}, | |
2556 {CC"init", CC"("MT")V", FN_PTR(MHI_init_MT)}, | |
2557 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHI_init_Mem)}, | |
2558 {CC"expand", CC"("MEM")V", FN_PTR(MHI_expand_Mem)}, | |
2559 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHI_resolve_Mem)}, | |
2560 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHI_getTarget)}, | |
2561 {CC"getConstant", CC"(I)I", FN_PTR(MHI_getConstant)}, | |
2562 // static native int getNamedCon(int which, Object[] name) | |
2563 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHI_getNamedCon)}, | |
2564 // static native int getMembers(Class<?> defc, String matchName, String matchSig, | |
2565 // int matchFlags, Class<?> caller, int skip, MemberName[] results); | |
2566 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHI_getMembers)} | |
2567 }; | |
2568 | |
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2569 // More entry points specifically for EnableInvokeDynamic. |
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2570 static JNINativeMethod methods2[] = { |
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2571 {CC"registerBootstrap", CC"("CLS MH")V", FN_PTR(MHI_registerBootstrap)}, |
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2572 {CC"getBootstrap", CC"("CLS")"MH, FN_PTR(MHI_getBootstrap)}, |
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2573 {CC"setCallSiteTarget", CC"("CST MH")V", FN_PTR(MHI_setCallSiteTarget)} |
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2574 }; |
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2575 |
710 | 2576 |
2577 // This one function is exported, used by NativeLookup. | |
2578 | |
2579 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { | |
2580 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK"); | |
2581 | |
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2582 // note: this explicit warning-producing stuff will be replaced by auto-detection of the JSR 292 classes |
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2583 |
710 | 2584 if (!EnableMethodHandles) { |
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2585 warning("JSR 292 method handles are disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableMethodHandles to enable."); |
710 | 2586 return; // bind nothing |
2587 } | |
2588 | |
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2589 bool enable_MH = true; |
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2590 |
710 | 2591 { |
2592 ThreadToNativeFromVM ttnfv(thread); | |
2593 | |
2594 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod)); | |
2595 if (env->ExceptionOccurred()) { | |
2596 MethodHandles::set_enabled(false); | |
2597 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); | |
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2598 enable_MH = false; |
710 | 2599 env->ExceptionClear(); |
2600 } | |
2601 } | |
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2602 |
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2603 if (enable_MH) { |
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2604 KlassHandle MHI_klass = SystemDictionaryHandles::MethodHandleImpl_klass(); |
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2605 if (MHI_klass.not_null()) { |
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2606 symbolHandle raiseException_name = oopFactory::new_symbol_handle("raiseException", CHECK); |
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2607 symbolHandle raiseException_sig = oopFactory::new_symbol_handle("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK); |
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2608 methodOop raiseException_method = instanceKlass::cast(MHI_klass->as_klassOop()) |
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2609 ->find_method(raiseException_name(), raiseException_sig()); |
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2610 if (raiseException_method != NULL && raiseException_method->is_static()) { |
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2611 MethodHandles::set_raise_exception_method(raiseException_method); |
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2612 } else { |
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2613 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); |
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2614 enable_MH = false; |
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2615 } |
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2616 } |
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2617 } |
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2618 |
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2619 if (enable_MH) { |
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2620 MethodHandles::set_enabled(true); |
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2621 } |
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2622 |
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2623 if (!EnableInvokeDynamic) { |
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2624 warning("JSR 292 invokedynamic is disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableInvokeDynamic to enable."); |
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2625 return; // bind nothing |
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2626 } |
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2627 |
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2628 { |
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2629 ThreadToNativeFromVM ttnfv(thread); |
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2630 |
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2631 int status = env->RegisterNatives(MHN_class, methods2, sizeof(methods2)/sizeof(JNINativeMethod)); |
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2632 if (env->ExceptionOccurred()) { |
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2633 MethodHandles::set_enabled(false); |
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2634 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); |
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2635 env->ExceptionClear(); |
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2636 } else { |
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2637 MethodHandles::set_enabled(true); |
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2638 } |
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2639 } |
710 | 2640 } |
2641 JVM_END |