Mercurial > hg > truffle
annotate src/share/vm/prims/methodHandles.cpp @ 2490:29246b1d2d3c
Renamed project HotSpotVM => Runtime
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Fri, 22 Apr 2011 15:22:45 +0200 |
parents | 3582bf76420e |
children | 72dee110246f |
rev | line source |
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710 | 1 /* |
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2 * Copyright (c) 2008, 2011, 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 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "interpreter/interpreter.hpp" | |
28 #include "memory/allocation.inline.hpp" | |
29 #include "memory/oopFactory.hpp" | |
30 #include "prims/methodHandles.hpp" | |
31 #include "runtime/javaCalls.hpp" | |
32 #include "runtime/reflection.hpp" | |
33 #include "runtime/signature.hpp" | |
34 #include "runtime/stubRoutines.hpp" | |
35 | |
710 | 36 /* |
37 * JSR 292 reference implementation: method handles | |
38 */ | |
39 | |
40 bool MethodHandles::_enabled = false; // set true after successful native linkage | |
41 | |
42 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL}; | |
43 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = { | |
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44 "raise_exception", |
710 | 45 "invokestatic", // how a MH emulates invokestatic |
46 "invokespecial", // ditto for the other invokes... | |
47 "invokevirtual", | |
48 "invokeinterface", | |
49 "bound_ref", // these are for BMH... | |
50 "bound_int", | |
51 "bound_long", | |
52 "bound_ref_direct", // (direct versions have a direct methodOop) | |
53 "bound_int_direct", | |
54 "bound_long_direct", | |
55 | |
56 // starting at _adapter_mh_first: | |
57 "adapter_retype_only", // these are for AMH... | |
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58 "adapter_retype_raw", |
710 | 59 "adapter_check_cast", |
60 "adapter_prim_to_prim", | |
61 "adapter_ref_to_prim", | |
62 "adapter_prim_to_ref", | |
63 "adapter_swap_args", | |
64 "adapter_rot_args", | |
65 "adapter_dup_args", | |
66 "adapter_drop_args", | |
67 "adapter_collect_args", | |
68 "adapter_spread_args", | |
69 "adapter_flyby", | |
70 "adapter_ricochet", | |
71 | |
72 // optimized adapter types: | |
73 "adapter_swap_args/1", | |
74 "adapter_swap_args/2", | |
75 "adapter_rot_args/1,up", | |
76 "adapter_rot_args/1,down", | |
77 "adapter_rot_args/2,up", | |
78 "adapter_rot_args/2,down", | |
79 "adapter_prim_to_prim/i2i", | |
80 "adapter_prim_to_prim/l2i", | |
81 "adapter_prim_to_prim/d2f", | |
82 "adapter_prim_to_prim/i2l", | |
83 "adapter_prim_to_prim/f2d", | |
84 "adapter_ref_to_prim/unboxi", | |
85 "adapter_ref_to_prim/unboxl", | |
86 "adapter_spread_args/0", | |
87 "adapter_spread_args/1", | |
88 "adapter_spread_args/more", | |
89 | |
90 NULL | |
91 }; | |
92 | |
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93 // Adapters. |
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94 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; |
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95 int MethodHandles::_adapter_code_size = StubRoutines::method_handles_adapters_code_size; |
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96 |
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97 jobject MethodHandles::_raise_exception_method; |
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98 |
710 | 99 #ifdef ASSERT |
100 bool MethodHandles::spot_check_entry_names() { | |
101 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), ""); | |
102 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), ""); | |
103 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), ""); | |
104 assert(!strcmp(entry_name(_adapter_ricochet), "adapter_ricochet"), ""); | |
105 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), ""); | |
106 return true; | |
107 } | |
108 #endif | |
109 | |
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110 |
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111 //------------------------------------------------------------------------------ |
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112 // MethodHandles::generate_adapters |
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113 // |
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114 void MethodHandles::generate_adapters() { |
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115 if (!EnableMethodHandles || SystemDictionary::MethodHandle_klass() == NULL) return; |
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116 |
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117 assert(_adapter_code == NULL, "generate only once"); |
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118 |
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119 ResourceMark rm; |
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120 TraceTime timer("MethodHandles adapters generation", TraceStartupTime); |
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121 _adapter_code = MethodHandlesAdapterBlob::create(_adapter_code_size); |
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122 if (_adapter_code == NULL) |
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123 vm_exit_out_of_memory(_adapter_code_size, "CodeCache: no room for MethodHandles adapters"); |
1748 | 124 CodeBuffer code(_adapter_code); |
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125 MethodHandlesAdapterGenerator g(&code); |
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126 g.generate(); |
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127 } |
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128 |
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129 |
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130 //------------------------------------------------------------------------------ |
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131 // MethodHandlesAdapterGenerator::generate |
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132 // |
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133 void MethodHandlesAdapterGenerator::generate() { |
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134 // Generate generic method handle adapters. |
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135 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST; |
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136 ek < MethodHandles::_EK_LIMIT; |
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137 ek = MethodHandles::EntryKind(1 + (int)ek)) { |
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138 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek)); |
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139 MethodHandles::generate_method_handle_stub(_masm, ek); |
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140 } |
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141 } |
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142 |
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143 |
710 | 144 void MethodHandles::set_enabled(bool z) { |
145 if (_enabled != z) { | |
146 guarantee(z && EnableMethodHandles, "can only enable once, and only if -XX:+EnableMethodHandles"); | |
147 _enabled = z; | |
148 } | |
149 } | |
150 | |
151 // Note: A method which does not have a TRAPS argument cannot block in the GC | |
152 // or throw exceptions. Such methods are used in this file to do something quick | |
153 // and local, like parse a data structure. For speed, such methods work on plain | |
154 // oops, not handles. Trapping methods uniformly operate on handles. | |
155 | |
156 methodOop MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype, | |
157 klassOop& receiver_limit_result, int& decode_flags_result) { | |
158 if (vmtarget == NULL) return NULL; | |
159 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding"); | |
160 if (vmindex < 0) { | |
161 // this DMH performs no dispatch; it is directly bound to a methodOop | |
162 // A MemberName may either be directly bound to a methodOop, | |
163 // or it may use the klass/index form; both forms mean the same thing. | |
164 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result); | |
165 if ((decode_flags_result & _dmf_has_receiver) != 0 | |
166 && java_dyn_MethodType::is_instance(mtype)) { | |
167 // Extract receiver type restriction from mtype.ptypes[0]. | |
168 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype); | |
169 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0); | |
170 if (java_lang_Class::is_instance(ptype0)) | |
171 receiver_limit_result = java_lang_Class::as_klassOop(ptype0); | |
172 } | |
173 if (vmindex == methodOopDesc::nonvirtual_vtable_index) { | |
174 // this DMH can be an "invokespecial" version | |
175 decode_flags_result &= ~_dmf_does_dispatch; | |
176 } else { | |
177 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?"); | |
178 } | |
179 return m; | |
180 } else { | |
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181 assert(vmtarget->is_klass(), "must be class or interface"); |
710 | 182 decode_flags_result |= MethodHandles::_dmf_does_dispatch; |
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183 decode_flags_result |= MethodHandles::_dmf_has_receiver; |
710 | 184 receiver_limit_result = (klassOop)vmtarget; |
185 Klass* tk = Klass::cast((klassOop)vmtarget); | |
186 if (tk->is_interface()) { | |
187 // an itable linkage is <interface, itable index> | |
188 decode_flags_result |= MethodHandles::_dmf_from_interface; | |
189 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex); | |
190 } else { | |
191 if (!tk->oop_is_instance()) | |
1142 | 192 tk = instanceKlass::cast(SystemDictionary::Object_klass()); |
710 | 193 return ((instanceKlass*)tk)->method_at_vtable(vmindex); |
194 } | |
195 } | |
196 } | |
197 | |
198 // MemberName and DirectMethodHandle have the same linkage to the JVM internals. | |
199 // (MemberName is the non-operational name used for queries and setup.) | |
200 | |
201 methodOop MethodHandles::decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
202 oop vmtarget = sun_dyn_DirectMethodHandle::vmtarget(mh); | |
203 int vmindex = sun_dyn_DirectMethodHandle::vmindex(mh); | |
204 oop mtype = sun_dyn_DirectMethodHandle::type(mh); | |
205 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result); | |
206 } | |
207 | |
208 methodOop MethodHandles::decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
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209 assert(sun_dyn_BoundMethodHandle::is_instance(mh), ""); |
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210 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), ""); |
710 | 211 for (oop bmh = mh;;) { |
212 // Bound MHs can be stacked to bind several arguments. | |
213 oop target = java_dyn_MethodHandle::vmtarget(bmh); | |
214 if (target == NULL) return NULL; | |
215 decode_flags_result |= MethodHandles::_dmf_binds_argument; | |
216 klassOop tk = target->klass(); | |
217 if (tk == SystemDictionary::BoundMethodHandle_klass()) { | |
218 bmh = target; | |
219 continue; | |
220 } else { | |
221 if (java_dyn_MethodHandle::is_subclass(tk)) { | |
222 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH"); | |
223 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result); | |
224 } else { | |
225 // Optimized case: binding a receiver to a non-dispatched DMH | |
226 // short-circuits directly to the methodOop. | |
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227 // (It might be another argument besides a receiver also.) |
710 | 228 assert(target->is_method(), "must be a simple method"); |
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229 decode_flags_result |= MethodHandles::_dmf_binds_method; |
710 | 230 methodOop m = (methodOop) target; |
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231 if (!m->is_static()) |
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232 decode_flags_result |= MethodHandles::_dmf_has_receiver; |
710 | 233 return m; |
234 } | |
235 } | |
236 } | |
237 } | |
238 | |
239 methodOop MethodHandles::decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
240 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), ""); | |
241 for (oop amh = mh;;) { | |
242 // Adapter MHs can be stacked to convert several arguments. | |
243 int conv_op = adapter_conversion_op(sun_dyn_AdapterMethodHandle::conversion(amh)); | |
244 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK; | |
245 oop target = java_dyn_MethodHandle::vmtarget(amh); | |
246 if (target == NULL) return NULL; | |
247 klassOop tk = target->klass(); | |
248 if (tk == SystemDictionary::AdapterMethodHandle_klass()) { | |
249 amh = target; | |
250 continue; | |
251 } else { | |
252 // must be a BMH (which will bind some more arguments) or a DMH (for the final call) | |
253 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result); | |
254 } | |
255 } | |
256 } | |
257 | |
258 methodOop MethodHandles::decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
259 if (mh == NULL) return NULL; | |
260 klassOop mhk = mh->klass(); | |
261 assert(java_dyn_MethodHandle::is_subclass(mhk), "must be a MethodHandle"); | |
262 if (mhk == SystemDictionary::DirectMethodHandle_klass()) { | |
263 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
264 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) { | |
265 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
266 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) { | |
267 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
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268 } else if (sun_dyn_BoundMethodHandle::is_subclass(mhk)) { |
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269 // could be a JavaMethodHandle (but not an adapter MH) |
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270 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); |
710 | 271 } else { |
272 assert(false, "cannot parse this MH"); | |
273 return NULL; // random MH? | |
274 } | |
275 } | |
276 | |
277 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) { | |
278 assert(m->is_method(), ""); | |
279 if (m->is_static()) { | |
280 // check that signature begins '(L' or '([' (not '(I', '()', etc.) | |
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281 Symbol* sig = m->signature(); |
710 | 282 BasicType recv_bt = char2type(sig->byte_at(1)); |
283 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')' | |
284 assert(sig->byte_at(0) == '(', "must be method sig"); | |
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285 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY) |
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286 // decode_flags_result |= _dmf_has_receiver; |
710 | 287 } else { |
288 // non-static method | |
289 decode_flags_result |= _dmf_has_receiver; | |
290 if (!m->can_be_statically_bound() && !m->is_initializer()) { | |
291 decode_flags_result |= _dmf_does_dispatch; | |
292 if (Klass::cast(m->method_holder())->is_interface()) | |
293 decode_flags_result |= _dmf_from_interface; | |
294 } | |
295 } | |
296 return m; | |
297 } | |
298 | |
299 | |
300 // A trusted party is handing us a cookie to determine a method. | |
301 // Let's boil it down to the method oop they really want. | |
302 methodOop MethodHandles::decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result) { | |
303 decode_flags_result = 0; | |
304 receiver_limit_result = NULL; | |
305 klassOop xk = x->klass(); | |
306 if (xk == Universe::methodKlassObj()) { | |
307 return decode_methodOop((methodOop) x, decode_flags_result); | |
308 } else if (xk == SystemDictionary::MemberName_klass()) { | |
309 // Note: This only works if the MemberName has already been resolved. | |
310 return decode_MemberName(x, receiver_limit_result, decode_flags_result); | |
311 } else if (java_dyn_MethodHandle::is_subclass(xk)) { | |
312 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result); | |
1142 | 313 } else if (xk == SystemDictionary::reflect_Method_klass()) { |
710 | 314 oop clazz = java_lang_reflect_Method::clazz(x); |
315 int slot = java_lang_reflect_Method::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); | |
1142 | 320 } else if (xk == SystemDictionary::reflect_Constructor_klass()) { |
710 | 321 oop clazz = java_lang_reflect_Constructor::clazz(x); |
322 int slot = java_lang_reflect_Constructor::slot(x); | |
323 klassOop k = java_lang_Class::as_klassOop(clazz); | |
324 if (k != NULL && Klass::cast(k)->oop_is_instance()) | |
325 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), | |
326 decode_flags_result); | |
327 } else { | |
328 // unrecognized object | |
329 assert(!x->is_method(), "already checked"); | |
330 assert(!sun_dyn_MemberName::is_instance(x), "already checked"); | |
331 } | |
332 return NULL; | |
333 } | |
334 | |
335 | |
336 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) { | |
337 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass()) | |
338 return 0; // no push/pop | |
339 int this_vmslots = java_dyn_MethodHandle::vmslots(mh); | |
340 int last_vmslots = 0; | |
341 oop last_mh = mh; | |
342 for (;;) { | |
343 oop target = java_dyn_MethodHandle::vmtarget(last_mh); | |
344 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { | |
345 last_vmslots = java_dyn_MethodHandle::vmslots(target); | |
346 break; | |
347 } else if (!java_dyn_MethodHandle::is_instance(target)) { | |
348 // might be klass or method | |
349 assert(target->is_method(), "must get here with a direct ref to method"); | |
350 last_vmslots = methodOop(target)->size_of_parameters(); | |
351 break; | |
352 } | |
353 last_mh = target; | |
354 } | |
355 // If I am called with fewer VM slots than my ultimate callee, | |
356 // it must be that I push the additionally needed slots. | |
357 // Likewise if am called with more VM slots, I will pop them. | |
358 return (last_vmslots - this_vmslots); | |
359 } | |
360 | |
361 | |
362 // MemberName support | |
363 | |
364 // import sun_dyn_MemberName.* | |
365 enum { | |
366 IS_METHOD = sun_dyn_MemberName::MN_IS_METHOD, | |
367 IS_CONSTRUCTOR = sun_dyn_MemberName::MN_IS_CONSTRUCTOR, | |
368 IS_FIELD = sun_dyn_MemberName::MN_IS_FIELD, | |
369 IS_TYPE = sun_dyn_MemberName::MN_IS_TYPE, | |
370 SEARCH_SUPERCLASSES = sun_dyn_MemberName::MN_SEARCH_SUPERCLASSES, | |
371 SEARCH_INTERFACES = sun_dyn_MemberName::MN_SEARCH_INTERFACES, | |
372 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE, | |
373 VM_INDEX_UNINITIALIZED = sun_dyn_MemberName::VM_INDEX_UNINITIALIZED | |
374 }; | |
375 | |
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376 Handle MethodHandles::new_MemberName(TRAPS) { |
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377 Handle empty; |
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378 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); |
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379 if (!k->is_initialized()) k->initialize(CHECK_(empty)); |
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380 return Handle(THREAD, k->allocate_instance(THREAD)); |
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381 } |
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382 |
710 | 383 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) { |
1142 | 384 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) { |
710 | 385 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() |
386 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() | |
387 int mods = java_lang_reflect_Field::modifiers(target_oop); | |
388 klassOop k = java_lang_Class::as_klassOop(clazz); | |
389 int offset = instanceKlass::cast(k)->offset_from_fields(slot); | |
390 init_MemberName(mname_oop, k, accessFlags_from(mods), offset); | |
391 } else { | |
392 int decode_flags = 0; klassOop receiver_limit = NULL; | |
393 methodOop m = MethodHandles::decode_method(target_oop, | |
394 receiver_limit, decode_flags); | |
395 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); | |
396 init_MemberName(mname_oop, m, do_dispatch); | |
397 } | |
398 } | |
399 | |
400 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) { | |
401 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD) | |
402 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS )); | |
403 oop vmtarget = m; | |
404 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet | |
405 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound()) | |
406 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch | |
407 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value"); | |
408 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); | |
409 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); | |
410 sun_dyn_MemberName::set_flags(mname_oop, flags); | |
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411 sun_dyn_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror()); |
710 | 412 } |
413 | |
414 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) { | |
415 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS )); | |
416 oop vmtarget = field_holder; | |
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417 int vmindex = offset; // determines the field uniquely when combined with static bit |
710 | 418 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex"); |
419 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); | |
420 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); | |
421 sun_dyn_MemberName::set_flags(mname_oop, flags); | |
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422 sun_dyn_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror()); |
710 | 423 } |
424 | |
425 | |
426 methodOop MethodHandles::decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result) { | |
427 int flags = sun_dyn_MemberName::flags(mname); | |
428 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return NULL; // not invocable | |
429 oop vmtarget = sun_dyn_MemberName::vmtarget(mname); | |
430 int vmindex = sun_dyn_MemberName::vmindex(mname); | |
431 if (vmindex == VM_INDEX_UNINITIALIZED) return NULL; // not resolved | |
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432 methodOop m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result); |
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433 oop clazz = sun_dyn_MemberName::clazz(mname); |
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434 if (clazz != NULL && java_lang_Class::is_instance(clazz)) { |
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435 klassOop klass = java_lang_Class::as_klassOop(clazz); |
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436 if (klass != NULL) receiver_limit_result = klass; |
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437 } |
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438 return m; |
710 | 439 } |
440 | |
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441 // convert the external string or reflective type to an internal signature |
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442 Symbol* MethodHandles::convert_to_signature(oop type_str, |
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443 bool polymorphic, |
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444 TRAPS) { |
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445 if (java_dyn_MethodType::is_instance(type_str)) { |
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446 return java_dyn_MethodType::as_signature(type_str, polymorphic, CHECK_NULL); |
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447 } else if (java_lang_Class::is_instance(type_str)) { |
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448 return java_lang_Class::as_signature(type_str, false, CHECK_NULL); |
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449 } else if (java_lang_String::is_instance(type_str)) { |
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450 if (polymorphic) { |
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451 return java_lang_String::as_symbol(type_str, CHECK_NULL); |
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452 } else { |
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453 return java_lang_String::as_symbol_or_null(type_str); |
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454 } |
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455 } else { |
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456 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); |
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457 } |
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458 } |
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459 |
710 | 460 // An unresolved member name is a mere symbolic reference. |
461 // Resolving it plants a vmtarget/vmindex in it, | |
462 // which refers dirctly to JVM internals. | |
463 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) { | |
464 assert(sun_dyn_MemberName::is_instance(mname()), ""); | |
465 #ifdef ASSERT | |
466 // If this assert throws, renegotiate the sentinel value used by the Java code, | |
467 // so that it is distinct from any valid vtable index value, and any special | |
468 // values defined in methodOopDesc::VtableIndexFlag. | |
469 // The point of the slop is to give the Java code and the JVM some room | |
470 // to independently specify sentinel values. | |
471 const int sentinel_slop = 10; | |
472 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop; | |
473 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels"); | |
474 #endif | |
475 if (sun_dyn_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED) | |
476 return; // already resolved | |
477 oop defc_oop = sun_dyn_MemberName::clazz(mname()); | |
478 oop name_str = sun_dyn_MemberName::name(mname()); | |
479 oop type_str = sun_dyn_MemberName::type(mname()); | |
480 int flags = sun_dyn_MemberName::flags(mname()); | |
481 | |
482 if (defc_oop == NULL || name_str == NULL || type_str == NULL) { | |
483 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve"); | |
484 } | |
485 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop); | |
486 defc_oop = NULL; // safety | |
487 if (defc_klassOop == NULL) return; // a primitive; no resolution possible | |
488 if (!Klass::cast(defc_klassOop)->oop_is_instance()) { | |
489 if (!Klass::cast(defc_klassOop)->oop_is_array()) return; | |
1142 | 490 defc_klassOop = SystemDictionary::Object_klass(); |
710 | 491 } |
492 instanceKlassHandle defc(THREAD, defc_klassOop); | |
493 defc_klassOop = NULL; // safety | |
494 if (defc.is_null()) { | |
495 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class"); | |
496 } | |
497 defc->link_class(CHECK); | |
498 | |
499 // convert the external string name to an internal symbol | |
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500 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str); |
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501 if (name == NULL) return; // no such name |
710 | 502 name_str = NULL; // safety |
503 | |
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504 Handle polymorphic_method_type; |
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505 bool polymorphic_signature = false; |
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506 if ((flags & ALL_KINDS) == IS_METHOD && |
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507 (defc() == SystemDictionary::MethodHandle_klass() && |
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508 methodOopDesc::is_method_handle_invoke_name(name))) |
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509 polymorphic_signature = true; |
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510 |
710 | 511 // convert the external string or reflective type to an internal signature |
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512 TempNewSymbol type = convert_to_signature(type_str, polymorphic_signature, CHECK); |
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513 if (java_dyn_MethodType::is_instance(type_str) && polymorphic_signature) { |
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514 polymorphic_method_type = Handle(THREAD, type_str); //preserve exactly |
710 | 515 } |
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516 |
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517 if (type == NULL) return; // no such signature exists in the VM |
710 | 518 type_str = NULL; // safety |
519 | |
520 // Time to do the lookup. | |
521 switch (flags & ALL_KINDS) { | |
522 case IS_METHOD: | |
523 { | |
524 CallInfo result; | |
525 { | |
526 EXCEPTION_MARK; | |
527 if ((flags & JVM_ACC_STATIC) != 0) { | |
528 LinkResolver::resolve_static_call(result, | |
529 defc, name, type, KlassHandle(), false, false, THREAD); | |
530 } else if (defc->is_interface()) { | |
531 LinkResolver::resolve_interface_call(result, Handle(), defc, | |
532 defc, name, type, KlassHandle(), false, false, THREAD); | |
533 } else { | |
534 LinkResolver::resolve_virtual_call(result, Handle(), defc, | |
535 defc, name, type, KlassHandle(), false, false, THREAD); | |
536 } | |
537 if (HAS_PENDING_EXCEPTION) { | |
538 CLEAR_PENDING_EXCEPTION; | |
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539 break; // go to second chance |
710 | 540 } |
541 } | |
542 methodHandle m = result.resolved_method(); | |
543 oop vmtarget = NULL; | |
544 int vmindex = methodOopDesc::nonvirtual_vtable_index; | |
545 if (defc->is_interface()) { | |
546 vmindex = klassItable::compute_itable_index(m()); | |
547 assert(vmindex >= 0, ""); | |
548 } else if (result.has_vtable_index()) { | |
549 vmindex = result.vtable_index(); | |
550 assert(vmindex >= 0, ""); | |
551 } | |
552 assert(vmindex != VM_INDEX_UNINITIALIZED, ""); | |
553 if (vmindex < 0) { | |
554 assert(result.is_statically_bound(), ""); | |
555 vmtarget = m(); | |
556 } else { | |
557 vmtarget = result.resolved_klass()->as_klassOop(); | |
558 } | |
559 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); | |
560 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
561 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
562 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
563 DEBUG_ONLY(int junk; klassOop junk2); | |
564 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), | |
565 "properly stored for later decoding"); | |
566 return; | |
567 } | |
568 case IS_CONSTRUCTOR: | |
569 { | |
570 CallInfo result; | |
571 { | |
572 EXCEPTION_MARK; | |
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573 if (name == vmSymbols::object_initializer_name()) { |
710 | 574 LinkResolver::resolve_special_call(result, |
575 defc, name, type, KlassHandle(), false, THREAD); | |
576 } else { | |
577 break; // will throw after end of switch | |
578 } | |
579 if (HAS_PENDING_EXCEPTION) { | |
580 CLEAR_PENDING_EXCEPTION; | |
581 return; | |
582 } | |
583 } | |
584 assert(result.is_statically_bound(), ""); | |
585 methodHandle m = result.resolved_method(); | |
586 oop vmtarget = m(); | |
587 int vmindex = methodOopDesc::nonvirtual_vtable_index; | |
588 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); | |
589 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
590 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
591 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
592 DEBUG_ONLY(int junk; klassOop junk2); | |
593 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), | |
594 "properly stored for later decoding"); | |
595 return; | |
596 } | |
597 case IS_FIELD: | |
598 { | |
599 // This is taken from LinkResolver::resolve_field, sans access checks. | |
600 fieldDescriptor fd; // find_field initializes fd if found | |
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601 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd)); |
710 | 602 // check if field exists; i.e., if a klass containing the field def has been selected |
603 if (sel_klass.is_null()) return; | |
604 oop vmtarget = sel_klass->as_klassOop(); | |
605 int vmindex = fd.offset(); | |
606 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS); | |
607 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen | |
608 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
609 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
610 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
611 return; | |
612 } | |
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613 default: |
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614 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); |
710 | 615 } |
1508
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616 |
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617 // Second chance. |
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618 if (polymorphic_method_type.not_null()) { |
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619 // Look on a non-null class loader. |
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620 Handle cur_class_loader; |
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621 const int nptypes = java_dyn_MethodType::ptype_count(polymorphic_method_type()); |
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622 for (int i = 0; i <= nptypes; i++) { |
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623 oop type_mirror; |
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624 if (i < nptypes) type_mirror = java_dyn_MethodType::ptype(polymorphic_method_type(), i); |
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625 else type_mirror = java_dyn_MethodType::rtype(polymorphic_method_type()); |
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626 klassOop example_type = java_lang_Class::as_klassOop(type_mirror); |
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627 if (example_type == NULL) continue; |
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628 oop class_loader = Klass::cast(example_type)->class_loader(); |
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629 if (class_loader == NULL || class_loader == cur_class_loader()) continue; |
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630 cur_class_loader = Handle(THREAD, class_loader); |
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631 methodOop m = SystemDictionary::find_method_handle_invoke(name, |
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632 type, |
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633 KlassHandle(THREAD, example_type), |
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634 THREAD); |
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635 if (HAS_PENDING_EXCEPTION) { |
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636 CLEAR_PENDING_EXCEPTION; |
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637 m = NULL; |
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638 // try again with a different class loader... |
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639 } |
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640 if (m != NULL) { |
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641 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); |
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642 sun_dyn_MemberName::set_vmtarget(mname(), m); |
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643 sun_dyn_MemberName::set_vmindex(mname(), m->vtable_index()); |
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644 sun_dyn_MemberName::set_modifiers(mname(), mods); |
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645 return; |
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646 } |
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647 } |
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648 } |
710 | 649 } |
650 | |
651 // Conversely, a member name which is only initialized from JVM internals | |
652 // may have null defc, name, and type fields. | |
653 // Resolving it plants a vmtarget/vmindex in it, | |
654 // which refers directly to JVM internals. | |
655 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { | |
656 assert(sun_dyn_MemberName::is_instance(mname()), ""); | |
657 oop vmtarget = sun_dyn_MemberName::vmtarget(mname()); | |
658 int vmindex = sun_dyn_MemberName::vmindex(mname()); | |
659 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) { | |
660 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); | |
661 } | |
662 | |
663 bool have_defc = (sun_dyn_MemberName::clazz(mname()) != NULL); | |
664 bool have_name = (sun_dyn_MemberName::name(mname()) != NULL); | |
665 bool have_type = (sun_dyn_MemberName::type(mname()) != NULL); | |
666 int flags = sun_dyn_MemberName::flags(mname()); | |
667 | |
668 if (suppress != 0) { | |
669 if (suppress & _suppress_defc) have_defc = true; | |
670 if (suppress & _suppress_name) have_name = true; | |
671 if (suppress & _suppress_type) have_type = true; | |
672 } | |
673 | |
674 if (have_defc && have_name && have_type) return; // nothing needed | |
675 | |
676 switch (flags & ALL_KINDS) { | |
677 case IS_METHOD: | |
678 case IS_CONSTRUCTOR: | |
679 { | |
680 klassOop receiver_limit = NULL; | |
681 int decode_flags = 0; | |
682 methodHandle m(THREAD, decode_vmtarget(vmtarget, vmindex, NULL, | |
683 receiver_limit, decode_flags)); | |
684 if (m.is_null()) break; | |
685 if (!have_defc) { | |
686 klassOop defc = m->method_holder(); | |
687 if (receiver_limit != NULL && receiver_limit != defc | |
688 && Klass::cast(receiver_limit)->is_subtype_of(defc)) | |
689 defc = receiver_limit; | |
690 sun_dyn_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror()); | |
691 } | |
692 if (!have_name) { | |
693 //not java_lang_String::create_from_symbol; let's intern member names | |
694 Handle name = StringTable::intern(m->name(), CHECK); | |
695 sun_dyn_MemberName::set_name(mname(), name()); | |
696 } | |
697 if (!have_type) { | |
698 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); | |
699 sun_dyn_MemberName::set_type(mname(), type()); | |
700 } | |
701 return; | |
702 } | |
703 case IS_FIELD: | |
704 { | |
705 // This is taken from LinkResolver::resolve_field, sans access checks. | |
706 if (!vmtarget->is_klass()) break; | |
707 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break; | |
708 instanceKlassHandle defc(THREAD, (klassOop) vmtarget); | |
709 bool is_static = ((flags & JVM_ACC_STATIC) != 0); | |
710 fieldDescriptor fd; // find_field initializes fd if found | |
711 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) | |
712 break; // cannot expand | |
713 if (!have_defc) { | |
714 sun_dyn_MemberName::set_clazz(mname(), defc->java_mirror()); | |
715 } | |
716 if (!have_name) { | |
717 //not java_lang_String::create_from_symbol; let's intern member names | |
718 Handle name = StringTable::intern(fd.name(), CHECK); | |
719 sun_dyn_MemberName::set_name(mname(), name()); | |
720 } | |
721 if (!have_type) { | |
722 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK); | |
723 sun_dyn_MemberName::set_type(mname(), type()); | |
724 } | |
725 return; | |
726 } | |
727 } | |
728 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); | |
729 } | |
730 | |
731 int MethodHandles::find_MemberNames(klassOop k, | |
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732 Symbol* name, Symbol* sig, |
710 | 733 int mflags, klassOop caller, |
734 int skip, objArrayOop results) { | |
735 DEBUG_ONLY(No_Safepoint_Verifier nsv); | |
736 // this code contains no safepoints! | |
737 | |
738 // %%% take caller into account! | |
739 | |
740 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1; | |
741 | |
742 int rfill = 0, rlimit = results->length(), rskip = skip; | |
743 // overflow measurement: | |
744 int overflow = 0, overflow_limit = MAX2(1000, rlimit); | |
745 | |
746 int match_flags = mflags; | |
747 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); | |
748 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); | |
749 bool local_only = !(search_superc | search_intfc); | |
750 bool classes_only = false; | |
751 | |
752 if (name != NULL) { | |
753 if (name->utf8_length() == 0) return 0; // a match is not possible | |
754 } | |
755 if (sig != NULL) { | |
756 if (sig->utf8_length() == 0) return 0; // a match is not possible | |
757 if (sig->byte_at(0) == '(') | |
758 match_flags &= ~(IS_FIELD | IS_TYPE); | |
759 else | |
760 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); | |
761 } | |
762 | |
763 if ((match_flags & IS_TYPE) != 0) { | |
764 // NYI, and Core Reflection works quite well for this query | |
765 } | |
766 | |
767 if ((match_flags & IS_FIELD) != 0) { | |
768 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { | |
769 if (name != NULL && st.name() != name) | |
770 continue; | |
771 if (sig != NULL && st.signature() != sig) | |
772 continue; | |
773 // passed the filters | |
774 if (rskip > 0) { | |
775 --rskip; | |
776 } else if (rfill < rlimit) { | |
777 oop result = results->obj_at(rfill++); | |
778 if (!sun_dyn_MemberName::is_instance(result)) | |
779 return -99; // caller bug! | |
780 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset()); | |
781 } else if (++overflow >= overflow_limit) { | |
782 match_flags = 0; break; // got tired of looking at overflow | |
783 } | |
784 } | |
785 } | |
786 | |
787 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { | |
788 // watch out for these guys: | |
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789 Symbol* init_name = vmSymbols::object_initializer_name(); |
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790 Symbol* clinit_name = vmSymbols::class_initializer_name(); |
710 | 791 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> |
792 bool negate_name_test = false; | |
793 // fix name so that it captures the intention of IS_CONSTRUCTOR | |
794 if (!(match_flags & IS_METHOD)) { | |
795 // constructors only | |
796 if (name == NULL) { | |
797 name = init_name; | |
798 } else if (name != init_name) { | |
799 return 0; // no constructors of this method name | |
800 } | |
801 } else if (!(match_flags & IS_CONSTRUCTOR)) { | |
802 // methods only | |
803 if (name == NULL) { | |
804 name = init_name; | |
805 negate_name_test = true; // if we see the name, we *omit* the entry | |
806 } else if (name == init_name) { | |
807 return 0; // no methods of this constructor name | |
808 } | |
809 } else { | |
810 // caller will accept either sort; no need to adjust name | |
811 } | |
812 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { | |
813 methodOop m = st.method(); | |
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814 Symbol* m_name = m->name(); |
710 | 815 if (m_name == clinit_name) |
816 continue; | |
817 if (name != NULL && ((m_name != name) ^ negate_name_test)) | |
818 continue; | |
819 if (sig != NULL && m->signature() != sig) | |
820 continue; | |
821 // passed the filters | |
822 if (rskip > 0) { | |
823 --rskip; | |
824 } else if (rfill < rlimit) { | |
825 oop result = results->obj_at(rfill++); | |
826 if (!sun_dyn_MemberName::is_instance(result)) | |
827 return -99; // caller bug! | |
828 MethodHandles::init_MemberName(result, m, true); | |
829 } else if (++overflow >= overflow_limit) { | |
830 match_flags = 0; break; // got tired of looking at overflow | |
831 } | |
832 } | |
833 } | |
834 | |
835 // return number of elements we at leasted wanted to initialize | |
836 return rfill + overflow; | |
837 } | |
838 | |
839 | |
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840 // Decode this java.lang.Class object into an instanceKlass, if possible. |
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841 // Throw IAE if not |
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842 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) { |
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843 instanceKlassHandle empty; |
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844 klassOop caller = NULL; |
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845 if (java_lang_Class::is_instance(java_mirror_oop)) { |
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846 caller = java_lang_Class::as_klassOop(java_mirror_oop); |
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847 } |
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848 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) { |
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849 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty); |
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850 } |
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851 return instanceKlassHandle(THREAD, caller); |
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852 } |
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853 |
710 | 854 |
855 | |
856 // Decode the vmtarget field of a method handle. | |
857 // Sanitize out methodOops, klassOops, and any other non-Java data. | |
858 // This is for debugging and reflection. | |
859 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) { | |
860 assert(java_dyn_MethodHandle::is_instance(mh()), "must be a MH"); | |
861 if (format == ETF_HANDLE_OR_METHOD_NAME) { | |
862 oop target = java_dyn_MethodHandle::vmtarget(mh()); | |
863 if (target == NULL) { | |
864 return NULL; // unformed MH | |
865 } | |
866 klassOop tklass = target->klass(); | |
1142 | 867 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) { |
710 | 868 return target; // target is another MH (or something else?) |
869 } | |
870 } | |
871 if (format == ETF_DIRECT_HANDLE) { | |
872 oop target = mh(); | |
873 for (;;) { | |
874 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { | |
875 return target; | |
876 } | |
877 if (!java_dyn_MethodHandle::is_instance(target)){ | |
878 return NULL; // unformed MH | |
879 } | |
880 target = java_dyn_MethodHandle::vmtarget(target); | |
881 } | |
882 } | |
883 // cases of metadata in MH.vmtarget: | |
884 // - AMH can have methodOop for static invoke with bound receiver | |
885 // - DMH can have methodOop for static invoke (on variable receiver) | |
886 // - DMH can have klassOop for dispatched (non-static) invoke | |
887 klassOop receiver_limit = NULL; | |
888 int decode_flags = 0; | |
889 methodOop m = decode_MethodHandle(mh(), receiver_limit, decode_flags); | |
890 if (m == NULL) return NULL; | |
891 switch (format) { | |
892 case ETF_REFLECT_METHOD: | |
893 // same as jni_ToReflectedMethod: | |
894 if (m->is_initializer()) { | |
895 return Reflection::new_constructor(m, THREAD); | |
896 } else { | |
897 return Reflection::new_method(m, UseNewReflection, false, THREAD); | |
898 } | |
899 | |
900 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle | |
901 case ETF_METHOD_NAME: | |
902 { | |
903 if (SystemDictionary::MemberName_klass() == NULL) break; | |
904 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass()); | |
905 mname_klass->initialize(CHECK_NULL); | |
906 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); | |
907 sun_dyn_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED); | |
908 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); | |
909 init_MemberName(mname(), m, do_dispatch); | |
910 expand_MemberName(mname, 0, CHECK_NULL); | |
911 return mname(); | |
912 } | |
913 } | |
914 | |
915 // Unknown format code. | |
916 char msg[50]; | |
917 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format); | |
918 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg); | |
919 } | |
920 | |
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921 static const char* always_null_names[] = { |
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922 "java/lang/Void", |
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923 "java/lang/Null", |
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924 //"java/lang/Nothing", |
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925 "sun/dyn/empty/Empty", |
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926 NULL |
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927 }; |
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928 |
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929 static bool is_always_null_type(klassOop klass) { |
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930 if (!Klass::cast(klass)->oop_is_instance()) return false; |
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931 instanceKlass* ik = instanceKlass::cast(klass); |
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932 // Must be on the boot class path: |
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933 if (ik->class_loader() != NULL) return false; |
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934 // Check the name. |
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935 Symbol* name = ik->name(); |
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936 for (int i = 0; ; i++) { |
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937 const char* test_name = always_null_names[i]; |
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938 if (test_name == NULL) break; |
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939 if (name->equals(test_name)) |
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940 return true; |
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941 } |
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942 return false; |
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943 } |
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944 |
710 | 945 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) { |
1142 | 946 if (src == dst || dst == SystemDictionary::Object_klass()) |
710 | 947 return false; // quickest checks |
948 Klass* srck = Klass::cast(src); | |
949 Klass* dstk = Klass::cast(dst); | |
950 if (dstk->is_interface()) { | |
951 // interface receivers can safely be viewed as untyped, | |
952 // because interface calls always include a dynamic check | |
1142 | 953 //dstk = Klass::cast(SystemDictionary::Object_klass()); |
710 | 954 return false; |
955 } | |
956 if (srck->is_interface()) { | |
957 // interface arguments must be viewed as untyped | |
1142 | 958 //srck = Klass::cast(SystemDictionary::Object_klass()); |
710 | 959 return true; |
960 } | |
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961 if (is_always_null_type(src)) { |
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962 // some source types are known to be never instantiated; |
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963 // they represent references which are always null |
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964 // such null references never fail to convert safely |
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965 return false; |
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966 } |
710 | 967 return !srck->is_subclass_of(dstk->as_klassOop()); |
968 } | |
969 | |
970 static oop object_java_mirror() { | |
1142 | 971 return Klass::cast(SystemDictionary::Object_klass())->java_mirror(); |
710 | 972 } |
973 | |
974 bool MethodHandles::same_basic_type_for_arguments(BasicType src, | |
975 BasicType dst, | |
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976 bool raw, |
710 | 977 bool for_return) { |
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978 if (for_return) { |
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979 // return values can always be forgotten: |
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980 if (dst == T_VOID) return true; |
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981 if (src == T_VOID) return raw && (dst == T_INT); |
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982 // We allow caller to receive a garbage int, which is harmless. |
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983 // This trick is pulled by trusted code (see VerifyType.canPassRaw). |
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984 } |
710 | 985 assert(src != T_VOID && dst != T_VOID, "should not be here"); |
986 if (src == dst) return true; | |
987 if (type2size[src] != type2size[dst]) return false; | |
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988 if (src == T_OBJECT || dst == T_OBJECT) return false; |
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989 if (raw) return true; // bitwise reinterpretation; caller guarantees safety |
710 | 990 // allow reinterpretation casts for integral widening |
991 if (is_subword_type(src)) { // subwords can fit in int or other subwords | |
992 if (dst == T_INT) // any subword fits in an int | |
993 return true; | |
994 if (src == T_BOOLEAN) // boolean fits in any subword | |
995 return is_subword_type(dst); | |
996 if (src == T_BYTE && dst == T_SHORT) | |
997 return true; // remaining case: byte fits in short | |
998 } | |
999 // allow float/fixed reinterpretation casts | |
1000 if (src == T_FLOAT) return dst == T_INT; | |
1001 if (src == T_INT) return dst == T_FLOAT; | |
1002 if (src == T_DOUBLE) return dst == T_LONG; | |
1003 if (src == T_LONG) return dst == T_DOUBLE; | |
1004 return false; | |
1005 } | |
1006 | |
1007 const char* MethodHandles::check_method_receiver(methodOop m, | |
1008 klassOop passed_recv_type) { | |
1009 assert(!m->is_static(), "caller resp."); | |
1010 if (passed_recv_type == NULL) | |
1011 return "receiver type is primitive"; | |
1012 if (class_cast_needed(passed_recv_type, m->method_holder())) { | |
1013 Klass* formal = Klass::cast(m->method_holder()); | |
1014 return SharedRuntime::generate_class_cast_message("receiver type", | |
1015 formal->external_name()); | |
1016 } | |
1017 return NULL; // checks passed | |
1018 } | |
1019 | |
1020 // Verify that m's signature can be called type-safely by a method handle | |
1021 // of the given method type 'mtype'. | |
1022 // It takes a TRAPS argument because it must perform symbol lookups. | |
1023 void MethodHandles::verify_method_signature(methodHandle m, | |
1024 Handle mtype, | |
1025 int first_ptype_pos, | |
1026 KlassHandle insert_ptype, | |
1027 TRAPS) { | |
1028 objArrayHandle ptypes(THREAD, java_dyn_MethodType::ptypes(mtype())); | |
1029 int pnum = first_ptype_pos; | |
1030 int pmax = ptypes->length(); | |
1031 int mnum = 0; // method argument | |
1032 const char* err = NULL; | |
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1033 ResourceMark rm(THREAD); |
710 | 1034 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) { |
1035 oop ptype_oop = NULL; | |
1036 if (ss.at_return_type()) { | |
1037 if (pnum != pmax) | |
1038 { err = "too many arguments"; break; } | |
1039 ptype_oop = java_dyn_MethodType::rtype(mtype()); | |
1040 } else { | |
1041 if (pnum >= pmax) | |
1042 { err = "not enough arguments"; break; } | |
1043 if (pnum >= 0) | |
1044 ptype_oop = ptypes->obj_at(pnum); | |
1045 else if (insert_ptype.is_null()) | |
1046 ptype_oop = NULL; | |
1047 else | |
1048 ptype_oop = insert_ptype->java_mirror(); | |
1049 pnum += 1; | |
1050 mnum += 1; | |
1051 } | |
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1052 klassOop pklass = NULL; |
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1053 BasicType ptype = T_OBJECT; |
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1054 if (ptype_oop != NULL) |
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1055 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass); |
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1056 else |
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1057 // null does not match any non-reference; use Object to report the error |
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1058 pklass = SystemDictionary::Object_klass(); |
710 | 1059 klassOop mklass = NULL; |
1060 BasicType mtype = ss.type(); | |
1061 if (mtype == T_ARRAY) mtype = T_OBJECT; // fold all refs to T_OBJECT | |
1062 if (mtype == T_OBJECT) { | |
1063 if (ptype_oop == NULL) { | |
1064 // null matches any reference | |
1065 continue; | |
1066 } | |
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1067 KlassHandle pklass_handle(THREAD, pklass); pklass = NULL; |
710 | 1068 // If we fail to resolve types at this point, we will throw an error. |
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1069 Symbol* name = ss.as_symbol(CHECK); |
710 | 1070 instanceKlass* mk = instanceKlass::cast(m->method_holder()); |
1071 Handle loader(THREAD, mk->class_loader()); | |
1072 Handle domain(THREAD, mk->protection_domain()); | |
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1073 mklass = SystemDictionary::resolve_or_null(name, loader, domain, CHECK); |
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1074 pklass = pklass_handle(); |
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1075 if (mklass == NULL && pklass != NULL && |
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1076 Klass::cast(pklass)->name() == name && |
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1077 m->is_method_handle_invoke()) { |
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1078 // Assume a match. We can't really decode the signature of MH.invoke*. |
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1079 continue; |
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1080 } |
710 | 1081 } |
1082 if (!ss.at_return_type()) { | |
1083 err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum); | |
1084 } else { | |
1085 err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal! | |
1086 } | |
1087 if (err != NULL) break; | |
1088 } | |
1089 | |
1090 if (err != NULL) { | |
1091 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
1092 } | |
1093 } | |
1094 | |
1095 // Main routine for verifying the MethodHandle.type of a proposed | |
1096 // direct or bound-direct method handle. | |
1097 void MethodHandles::verify_method_type(methodHandle m, | |
1098 Handle mtype, | |
1099 bool has_bound_recv, | |
1100 KlassHandle bound_recv_type, | |
1101 TRAPS) { | |
1102 bool m_needs_receiver = !m->is_static(); | |
1103 | |
1104 const char* err = NULL; | |
1105 | |
1106 int first_ptype_pos = m_needs_receiver ? 1 : 0; | |
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1107 if (has_bound_recv) { |
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1108 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them |
710 | 1109 if (m_needs_receiver && bound_recv_type.is_null()) |
1110 { err = "bound receiver is not an object"; goto die; } | |
1111 } | |
1112 | |
1113 if (m_needs_receiver && err == NULL) { | |
1114 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype()); | |
1115 if (ptypes->length() < first_ptype_pos) | |
1116 { err = "receiver argument is missing"; goto die; } | |
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1117 if (has_bound_recv) |
710 | 1118 err = check_method_receiver(m(), bound_recv_type->as_klassOop()); |
1119 else | |
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1120 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1))); |
710 | 1121 if (err != NULL) goto die; |
1122 } | |
1123 | |
1124 // Check the other arguments for mistypes. | |
1125 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK); | |
1126 return; | |
1127 | |
1128 die: | |
1129 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
1130 } | |
1131 | |
1132 void MethodHandles::verify_vmslots(Handle mh, TRAPS) { | |
1133 // Verify vmslots. | |
1134 int check_slots = argument_slot_count(java_dyn_MethodHandle::type(mh())); | |
1135 if (java_dyn_MethodHandle::vmslots(mh()) != check_slots) { | |
1136 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH"); | |
1137 } | |
1138 } | |
1139 | |
1140 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) { | |
1141 // Verify that argslot points at the given argnum. | |
1142 int check_slot = argument_slot(java_dyn_MethodHandle::type(mh()), argnum); | |
1143 if (argslot != check_slot || argslot < 0) { | |
1144 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d"; | |
1145 size_t msglen = strlen(fmt) + 3*11 + 1; | |
1146 char* msg = NEW_RESOURCE_ARRAY(char, msglen); | |
1147 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot); | |
1148 THROW_MSG(vmSymbols::java_lang_InternalError(), msg); | |
1149 } | |
1150 } | |
1151 | |
1152 // Verify the correspondence between two method types. | |
1153 // Apart from the advertised changes, caller method type X must | |
1154 // be able to invoke the callee method Y type with no violations | |
1155 // of type integrity. | |
1156 // Return NULL if all is well, else a short error message. | |
1157 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end, | |
1158 int insert_argnum, oop insert_type, | |
1159 int change_argnum, oop change_type, | |
1160 int delete_argnum, | |
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1161 oop dst_mtype, int dst_beg, int dst_end, |
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1162 bool raw) { |
710 | 1163 objArrayOop src_ptypes = java_dyn_MethodType::ptypes(src_mtype); |
1164 objArrayOop dst_ptypes = java_dyn_MethodType::ptypes(dst_mtype); | |
1165 | |
1166 int src_max = src_ptypes->length(); | |
1167 int dst_max = dst_ptypes->length(); | |
1168 | |
1169 if (src_end == -1) src_end = src_max; | |
1170 if (dst_end == -1) dst_end = dst_max; | |
1171 | |
1172 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob"); | |
1173 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob"); | |
1174 | |
1175 // pending actions; set to -1 when done: | |
1176 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum; | |
1177 | |
1178 const char* err = NULL; | |
1179 | |
1180 // Walk along each array of parameter types, including a virtual | |
1181 // NULL end marker at the end of each. | |
1182 for (int src_idx = src_beg, dst_idx = dst_beg; | |
1183 (src_idx <= src_end && dst_idx <= dst_end); | |
1184 src_idx++, dst_idx++) { | |
1185 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx); | |
1186 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx); | |
1187 bool fix_null_src_type = false; | |
1188 | |
1189 // Perform requested edits. | |
1190 if (ins_idx == src_idx) { | |
1191 // note that the inserted guy is never affected by a change or deletion | |
1192 ins_idx = -1; | |
1193 src_type = insert_type; | |
1194 fix_null_src_type = true; | |
1195 --src_idx; // back up to process src type on next loop | |
1196 src_idx = src_end; | |
1197 } else { | |
1198 // note that the changed guy can be immediately deleted | |
1199 if (chg_idx == src_idx) { | |
1200 chg_idx = -1; | |
1201 assert(src_idx < src_end, "oob"); | |
1202 src_type = change_type; | |
1203 fix_null_src_type = true; | |
1204 } | |
1205 if (del_idx == src_idx) { | |
1206 del_idx = -1; | |
1207 assert(src_idx < src_end, "oob"); | |
1208 --dst_idx; | |
1209 continue; // rerun loop after skipping this position | |
1210 } | |
1211 } | |
1212 | |
1213 if (src_type == NULL && fix_null_src_type) | |
1214 // explicit null in this case matches any dest reference | |
1215 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type); | |
1216 | |
1217 // Compare the two argument types. | |
1218 if (src_type != dst_type) { | |
1219 if (src_type == NULL) return "not enough arguments"; | |
1220 if (dst_type == NULL) return "too many arguments"; | |
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1221 err = check_argument_type_change(src_type, dst_type, dst_idx, raw); |
710 | 1222 if (err != NULL) return err; |
1223 } | |
1224 } | |
1225 | |
1226 // Now compare return types also. | |
1227 oop src_rtype = java_dyn_MethodType::rtype(src_mtype); | |
1228 oop dst_rtype = java_dyn_MethodType::rtype(dst_mtype); | |
1229 if (src_rtype != dst_rtype) { | |
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1230 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal! |
710 | 1231 if (err != NULL) return err; |
1232 } | |
1233 | |
1234 assert(err == NULL, ""); | |
1235 return NULL; // all is well | |
1236 } | |
1237 | |
1238 | |
1239 const char* MethodHandles::check_argument_type_change(BasicType src_type, | |
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1240 klassOop src_klass, |
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1241 BasicType dst_type, |
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1242 klassOop dst_klass, |
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1243 int argnum, |
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1244 bool raw) { |
710 | 1245 const char* err = NULL; |
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1246 bool for_return = (argnum < 0); |
710 | 1247 |
1248 // just in case: | |
1249 if (src_type == T_ARRAY) src_type = T_OBJECT; | |
1250 if (dst_type == T_ARRAY) dst_type = T_OBJECT; | |
1251 | |
1252 // Produce some nice messages if VerifyMethodHandles is turned on: | |
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1253 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) { |
710 | 1254 if (src_type == T_OBJECT) { |
1039
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1255 if (raw && dst_type == T_INT && is_always_null_type(src_klass)) |
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1256 return NULL; // OK to convert a null pointer to a garbage int |
710 | 1257 err = ((argnum >= 0) |
1258 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s" | |
1259 : "type mismatch: returning a %s, but caller expects primitive %s"); | |
1260 } else if (dst_type == T_OBJECT) { | |
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1261 err = ((argnum >= 0) |
710 | 1262 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s" |
1263 : "type mismatch: returning a primitive %s, but caller expects %s"); | |
1264 } else { | |
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1265 err = ((argnum >= 0) |
710 | 1266 ? "type mismatch: passing a %s for method argument #%d, which expects %s" |
1267 : "type mismatch: returning a %s, but caller expects %s"); | |
1268 } | |
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1269 } else if (src_type == T_OBJECT && dst_type == T_OBJECT && |
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1270 class_cast_needed(src_klass, dst_klass)) { |
710 | 1271 if (!class_cast_needed(dst_klass, src_klass)) { |
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1272 if (raw) |
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1273 return NULL; // reverse cast is OK; the MH target is trusted to enforce it |
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1274 err = ((argnum >= 0) |
710 | 1275 ? "cast required: passing a %s for method argument #%d, which expects %s" |
1276 : "cast required: returning a %s, but caller expects %s"); | |
1277 } else { | |
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1278 err = ((argnum >= 0) |
710 | 1279 ? "reference mismatch: passing a %s for method argument #%d, which expects %s" |
1280 : "reference mismatch: returning a %s, but caller expects %s"); | |
1281 } | |
1282 } else { | |
1283 // passed the obstacle course | |
1284 return NULL; | |
1285 } | |
1286 | |
1287 // format, format, format | |
1288 const char* src_name = type2name(src_type); | |
1289 const char* dst_name = type2name(dst_type); | |
1290 if (src_type == T_OBJECT) src_name = Klass::cast(src_klass)->external_name(); | |
1291 if (dst_type == T_OBJECT) dst_name = Klass::cast(dst_klass)->external_name(); | |
1292 if (src_name == NULL) src_name = "unknown type"; | |
1293 if (dst_name == NULL) dst_name = "unknown type"; | |
1294 | |
1295 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11); | |
1296 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1); | |
1297 if (argnum >= 0) { | |
1298 assert(strstr(err, "%d") != NULL, ""); | |
1299 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name); | |
1300 } else { | |
1301 assert(strstr(err, "%d") == NULL, ""); | |
1302 jio_snprintf(msg, msglen, err, src_name, dst_name); | |
1303 } | |
1304 return msg; | |
1305 } | |
1306 | |
1307 // Compute the depth within the stack of the given argument, i.e., | |
1308 // the combined size of arguments to the right of the given argument. | |
1309 // For the last argument (ptypes.length-1) this will be zero. | |
1310 // For the first argument (0) this will be the size of all | |
1311 // arguments but that one. For the special number -1, this | |
1312 // will be the size of all arguments, including the first. | |
1313 // If the argument is neither -1 nor a valid argument index, | |
1314 // then return a negative number. Otherwise, the result | |
1315 // is in the range [0..vmslots] inclusive. | |
1316 int MethodHandles::argument_slot(oop method_type, int arg) { | |
1317 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); | |
1318 int argslot = 0; | |
1319 int len = ptypes->length(); | |
1320 if (arg < -1 || arg >= len) return -99; | |
1321 for (int i = len-1; i > arg; i--) { | |
1322 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); | |
1323 argslot += type2size[bt]; | |
1324 } | |
1325 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works"); | |
1326 return argslot; | |
1327 } | |
1328 | |
1329 // Given a slot number, return the argument number. | |
1330 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) { | |
1331 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); | |
1332 int argslot = 0; | |
1333 int len = ptypes->length(); | |
1334 for (int i = len-1; i >= 0; i--) { | |
1335 if (query_argslot == argslot) return i; | |
1336 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); | |
1337 argslot += type2size[bt]; | |
1338 } | |
1339 // return pseudo-arg deepest in stack: | |
1340 if (query_argslot == argslot) return -1; | |
1341 return -99; // oob slot, or splitting a double-slot arg | |
1342 } | |
1343 | |
1344 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m, | |
1345 KlassHandle receiver_limit, | |
1346 int decode_flags, | |
1347 KlassHandle receiver_klass, | |
1348 TRAPS) { | |
1349 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference"); | |
1350 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument"); | |
1351 | |
1352 if (!m->is_static() && | |
1353 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder()))) | |
1354 // given type does not match class of method, or receiver is null! | |
1355 // caller should have checked this, but let's be extra careful... | |
1356 return methodHandle(); | |
1357 | |
1358 if (receiver_limit.not_null() && | |
1359 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit()))) | |
1360 // given type is not limited to the receiver type | |
1361 // note that a null receiver can match any reference value, for a static method | |
1362 return methodHandle(); | |
1363 | |
1364 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) { | |
1365 // pre-dispatched or static method (null receiver is OK for static) | |
1366 return m; | |
1367 | |
1368 } else if (receiver_klass.is_null()) { | |
1369 // null receiver value; cannot dispatch | |
1370 return methodHandle(); | |
1371 | |
1372 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) { | |
1373 // perform virtual dispatch | |
1374 int vtable_index = m->vtable_index(); | |
1375 guarantee(vtable_index >= 0, "valid vtable index"); | |
1376 | |
1377 // receiver_klass might be an arrayKlassOop but all vtables start at | |
1378 // the same place. The cast is to avoid virtual call and assertion. | |
1379 // See also LinkResolver::runtime_resolve_virtual_method. | |
1380 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass()); | |
1381 DEBUG_ONLY(inst->verify_vtable_index(vtable_index)); | |
1382 methodOop m_oop = inst->method_at_vtable(vtable_index); | |
1383 return methodHandle(THREAD, m_oop); | |
1384 | |
1385 } else { | |
1386 // perform interface dispatch | |
1387 int itable_index = klassItable::compute_itable_index(m()); | |
1388 guarantee(itable_index >= 0, "valid itable index"); | |
1389 instanceKlass* inst = instanceKlass::cast(receiver_klass()); | |
1390 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD); | |
1391 return methodHandle(THREAD, m_oop); | |
1392 } | |
1393 } | |
1394 | |
1395 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) { | |
1396 // Verify type. | |
1397 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1398 verify_method_type(m, mtype, false, KlassHandle(), CHECK); | |
1399 | |
1400 // Verify vmslots. | |
1401 if (java_dyn_MethodHandle::vmslots(mh()) != m->size_of_parameters()) { | |
1402 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH"); | |
1403 } | |
1404 } | |
1405 | |
1406 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) { | |
1407 // Check arguments. | |
1408 if (mh.is_null() || m.is_null() || | |
1409 (!do_dispatch && m->is_abstract())) { | |
1410 THROW(vmSymbols::java_lang_InternalError()); | |
1411 } | |
1412 | |
1413 java_dyn_MethodHandle::init_vmslots(mh()); | |
1414 | |
1415 if (VerifyMethodHandles) { | |
1416 // The privileged code which invokes this routine should not make | |
1417 // a mistake about types, but it's better to verify. | |
1418 verify_DirectMethodHandle(mh, m, CHECK); | |
1419 } | |
1420 | |
1421 // Finally, after safety checks are done, link to the target method. | |
1422 // We will follow the same path as the latter part of | |
1423 // InterpreterRuntime::resolve_invoke(), which first finds the method | |
1424 // and then decides how to populate the constant pool cache entry | |
1425 // that links the interpreter calls to the method. We need the same | |
1426 // bits, and will use the same calling sequence code. | |
1427 | |
1428 int vmindex = methodOopDesc::garbage_vtable_index; | |
1429 oop vmtarget = NULL; | |
1430 | |
1431 instanceKlass::cast(m->method_holder())->link_class(CHECK); | |
1432 | |
1433 MethodHandleEntry* me = NULL; | |
1434 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) { | |
1435 // We are simulating an invokeinterface instruction. | |
1436 // (We might also be simulating an invokevirtual on a miranda method, | |
1437 // but it is safe to treat it as an invokeinterface.) | |
1438 assert(!m->can_be_statically_bound(), "no final methods on interfaces"); | |
1439 vmindex = klassItable::compute_itable_index(m()); | |
1440 assert(vmindex >= 0, "(>=0) == do_dispatch"); | |
1441 // Set up same bits as ConstantPoolCacheEntry::set_interface_call(). | |
1442 vmtarget = m->method_holder(); // the interface | |
1443 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh); | |
1444 } else if (!do_dispatch || m->can_be_statically_bound()) { | |
1445 // We are simulating an invokestatic or invokespecial instruction. | |
1446 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method(). | |
1447 vmtarget = m(); | |
1448 // this does not help dispatch, but it will make it possible to parse this MH: | |
1449 vmindex = methodOopDesc::nonvirtual_vtable_index; | |
1450 assert(vmindex < 0, "(>=0) == do_dispatch"); | |
1451 if (!m->is_static()) { | |
1452 me = MethodHandles::entry(MethodHandles::_invokespecial_mh); | |
1453 } else { | |
1454 me = MethodHandles::entry(MethodHandles::_invokestatic_mh); | |
1455 // Part of the semantics of a static call is an initialization barrier. | |
1456 // For a DMH, it is done now, when the handle is created. | |
1457 Klass* k = Klass::cast(m->method_holder()); | |
1458 if (k->should_be_initialized()) { | |
1459 k->initialize(CHECK); | |
1460 } | |
1461 } | |
1462 } else { | |
1463 // We are simulating an invokevirtual instruction. | |
1464 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method(). | |
1465 // The key logic is LinkResolver::runtime_resolve_virtual_method. | |
1466 vmindex = m->vtable_index(); | |
1467 vmtarget = m->method_holder(); | |
1468 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh); | |
1469 } | |
1470 | |
1471 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
1472 | |
1473 sun_dyn_DirectMethodHandle::set_vmtarget(mh(), vmtarget); | |
1474 sun_dyn_DirectMethodHandle::set_vmindex(mh(), vmindex); | |
1475 DEBUG_ONLY(int flags; klassOop rlimit); | |
1476 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(), | |
1477 "properly stored for later decoding"); | |
1478 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0)); | |
1479 assert(!(actual_do_dispatch && !do_dispatch), | |
1480 "do not perform dispatch if !do_dispatch specified"); | |
1481 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch"); | |
1482 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack"); | |
1483 | |
1484 // Done! | |
1485 java_dyn_MethodHandle::set_vmentry(mh(), me); | |
1486 } | |
1487 | |
1488 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh, | |
1489 methodHandle m, | |
1490 TRAPS) { | |
1491 // Verify type. | |
1492 oop receiver = sun_dyn_BoundMethodHandle::argument(mh()); | |
1493 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1494 KlassHandle bound_recv_type; | |
1495 if (receiver != NULL) bound_recv_type = KlassHandle(THREAD, receiver->klass()); | |
1496 verify_method_type(m, mtype, true, bound_recv_type, CHECK); | |
1497 | |
1498 int receiver_pos = m->size_of_parameters() - 1; | |
1499 | |
1500 // Verify MH.vmargslot, which should point at the bound receiver. | |
1501 verify_vmargslot(mh, -1, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); | |
1502 //verify_vmslots(mh, CHECK); | |
1503 | |
1504 // Verify vmslots. | |
1505 if (java_dyn_MethodHandle::vmslots(mh()) != receiver_pos) { | |
1506 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)"); | |
1507 } | |
1508 } | |
1509 | |
1510 // Initialize a BMH with a receiver bound directly to a methodOop. | |
1511 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh, | |
1512 methodHandle original_m, | |
1513 KlassHandle receiver_limit, | |
1514 int decode_flags, | |
1515 TRAPS) { | |
1516 // Check arguments. | |
1517 if (mh.is_null() || original_m.is_null()) { | |
1518 THROW(vmSymbols::java_lang_InternalError()); | |
1519 } | |
1520 | |
1521 KlassHandle receiver_klass; | |
1522 { | |
1523 oop receiver_oop = sun_dyn_BoundMethodHandle::argument(mh()); | |
1524 if (receiver_oop != NULL) | |
1525 receiver_klass = KlassHandle(THREAD, receiver_oop->klass()); | |
1526 } | |
1527 methodHandle m = dispatch_decoded_method(original_m, | |
1528 receiver_limit, decode_flags, | |
1529 receiver_klass, | |
1530 CHECK); | |
1531 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); } | |
1532 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); } | |
1533 | |
1534 java_dyn_MethodHandle::init_vmslots(mh()); | |
1535 | |
1536 if (VerifyMethodHandles) { | |
1537 verify_BoundMethodHandle_with_receiver(mh, m, CHECK); | |
1538 } | |
1539 | |
1540 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); | |
1541 | |
1542 DEBUG_ONLY(int junk; klassOop junk2); | |
1543 assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding"); | |
1544 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot"); | |
1545 | |
1546 // Done! | |
1547 java_dyn_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh)); | |
1548 } | |
1549 | |
1550 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum, | |
1551 bool direct_to_method, TRAPS) { | |
1552 Handle ptype_handle(THREAD, | |
1553 java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum)); | |
1554 KlassHandle ptype_klass; | |
1555 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass); | |
1556 int slots_pushed = type2size[ptype]; | |
1557 | |
1558 oop argument = sun_dyn_BoundMethodHandle::argument(mh()); | |
1559 | |
1560 const char* err = NULL; | |
1561 | |
1562 switch (ptype) { | |
1563 case T_OBJECT: | |
1564 if (argument != NULL) | |
1565 // we must implicitly convert from the arg type to the outgoing ptype | |
1566 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum); | |
1567 break; | |
1568 | |
1569 case T_ARRAY: case T_VOID: | |
1570 assert(false, "array, void do not appear here"); | |
1571 default: | |
1572 if (ptype != T_INT && !is_subword_type(ptype)) { | |
1573 err = "unexpected parameter type"; | |
1574 break; | |
1575 } | |
1576 // check subrange of Integer.value, if necessary | |
1142 | 1577 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) { |
710 | 1578 err = "bound integer argument must be of type java.lang.Integer"; |
1579 break; | |
1580 } | |
1581 if (ptype != T_INT) { | |
1582 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT); | |
1583 jint value = argument->int_field(value_offset); | |
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1584 int vminfo = adapter_unbox_subword_vminfo(ptype); |
710 | 1585 jint subword = truncate_subword_from_vminfo(value, vminfo); |
1586 if (value != subword) { | |
1587 err = "bound subword value does not fit into the subword type"; | |
1588 break; | |
1589 } | |
1590 } | |
1591 break; | |
1592 case T_FLOAT: | |
1593 case T_DOUBLE: | |
1594 case T_LONG: | |
1595 { | |
1596 // we must implicitly convert from the unboxed arg type to the outgoing ptype | |
1597 BasicType argbox = java_lang_boxing_object::basic_type(argument); | |
1598 if (argbox != ptype) { | |
1599 err = check_argument_type_change(T_OBJECT, (argument == NULL | |
1142 | 1600 ? SystemDictionary::Object_klass() |
710 | 1601 : argument->klass()), |
1602 ptype, ptype_klass(), argnum); | |
1603 assert(err != NULL, "this must be an error"); | |
1604 } | |
1605 break; | |
1606 } | |
1607 } | |
1608 | |
1609 if (err == NULL) { | |
1610 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); | |
1611 if (direct_to_method) { | |
1612 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots"); | |
1613 assert(slots_pushed <= MethodHandlePushLimit, ""); | |
1614 } else { | |
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1615 int target_pushes = decode_MethodHandle_stack_pushes(target()); |
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1616 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct"); |
710 | 1617 // do not blow the stack; use a Java-based adapter if this limit is exceeded |
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1618 // FIXME |
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1619 // if (slots_pushed + target_pushes > MethodHandlePushLimit) |
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1620 // err = "too many bound parameters"; |
710 | 1621 } |
1622 } | |
1623 | |
1624 if (err == NULL) { | |
1625 // Verify the rest of the method type. | |
1626 err = check_method_type_insertion(java_dyn_MethodHandle::type(mh()), | |
1627 argnum, ptype_handle(), | |
1628 java_dyn_MethodHandle::type(target())); | |
1629 } | |
1630 | |
1631 if (err != NULL) { | |
1632 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
1633 } | |
1634 } | |
1635 | |
1636 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { | |
1637 // Check arguments. | |
1638 if (mh.is_null() || target.is_null() || !java_dyn_MethodHandle::is_instance(target())) { | |
1639 THROW(vmSymbols::java_lang_InternalError()); | |
1640 } | |
1641 | |
1642 java_dyn_MethodHandle::init_vmslots(mh()); | |
1643 | |
1644 if (VerifyMethodHandles) { | |
1645 int insert_after = argnum - 1; | |
1646 verify_vmargslot(mh, insert_after, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); | |
1647 verify_vmslots(mh, CHECK); | |
1648 } | |
1649 | |
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1650 // Get bound type and required slots. |
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1651 oop ptype_oop = java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum); |
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1652 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop); |
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1653 int slots_pushed = type2size[ptype]; |
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1654 |
710 | 1655 // If (a) the target is a direct non-dispatched method handle, |
1656 // or (b) the target is a dispatched direct method handle and we | |
1657 // are binding the receiver, cut out the middle-man. | |
1658 // Do this by decoding the DMH and using its methodOop directly as vmtarget. | |
1659 bool direct_to_method = false; | |
1660 if (OptimizeMethodHandles && | |
1661 target->klass() == SystemDictionary::DirectMethodHandle_klass() && | |
1662 (argnum == 0 || sun_dyn_DirectMethodHandle::vmindex(target()) < 0)) { | |
1663 int decode_flags = 0; klassOop receiver_limit_oop = NULL; | |
1664 methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags)); | |
1665 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); } | |
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1666 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg. |
710 | 1667 assert(sun_dyn_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig"); |
1668 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) { | |
1669 KlassHandle receiver_limit(THREAD, receiver_limit_oop); | |
1670 init_BoundMethodHandle_with_receiver(mh, m, | |
1671 receiver_limit, decode_flags, | |
1672 CHECK); | |
1673 return; | |
1674 } | |
1675 | |
1676 // Even if it is not a bound receiver, we still might be able | |
1677 // to bind another argument and still invoke the methodOop directly. | |
1678 if (!(decode_flags & _dmf_does_dispatch)) { | |
1679 direct_to_method = true; | |
1680 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); | |
1681 } | |
1682 } | |
1683 if (!direct_to_method) | |
1684 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), target()); | |
1685 | |
1686 if (VerifyMethodHandles) { | |
1687 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK); | |
1688 } | |
1689 | |
1690 // Next question: Is this a ref, int, or long bound value? | |
1691 MethodHandleEntry* me = NULL; | |
1692 if (ptype == T_OBJECT) { | |
1693 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh); | |
1694 else me = MethodHandles::entry(_bound_ref_mh); | |
1695 } else if (slots_pushed == 2) { | |
1696 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh); | |
1697 else me = MethodHandles::entry(_bound_long_mh); | |
1698 } else if (slots_pushed == 1) { | |
1699 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh); | |
1700 else me = MethodHandles::entry(_bound_int_mh); | |
1701 } else { | |
1702 assert(false, ""); | |
1703 } | |
1704 | |
1705 // Done! | |
1706 java_dyn_MethodHandle::set_vmentry(mh(), me); | |
1707 } | |
1708 | |
1709 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) { | |
1710 char msg[200]; | |
1711 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err); | |
1712 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg); | |
1713 } | |
1714 | |
1715 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) { | |
1716 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); | |
1717 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); | |
1718 | |
1719 verify_vmargslot(mh, argnum, argslot, CHECK); | |
1720 verify_vmslots(mh, CHECK); | |
1721 | |
1722 jint conv_op = adapter_conversion_op(conversion); | |
1723 if (!conv_op_valid(conv_op)) { | |
1724 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD); | |
1725 return; | |
1726 } | |
1727 EntryKind ek = adapter_entry_kind(conv_op); | |
1728 | |
1729 int stack_move = adapter_conversion_stack_move(conversion); | |
1730 BasicType src = adapter_conversion_src_type(conversion); | |
1731 BasicType dest = adapter_conversion_dest_type(conversion); | |
1732 int vminfo = adapter_conversion_vminfo(conversion); // should be zero | |
1733 | |
1734 Handle argument(THREAD, sun_dyn_AdapterMethodHandle::argument(mh())); | |
1735 Handle target(THREAD, sun_dyn_AdapterMethodHandle::vmtarget(mh())); | |
1736 Handle src_mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
1737 Handle dst_mtype(THREAD, java_dyn_MethodHandle::type(target())); | |
1738 | |
1739 const char* err = NULL; | |
1740 | |
1741 if (err == NULL) { | |
1742 // Check that the correct argument is supplied, but only if it is required. | |
1743 switch (ek) { | |
1744 case _adapter_check_cast: // target type of cast | |
1745 case _adapter_ref_to_prim: // wrapper type from which to unbox | |
1746 case _adapter_prim_to_ref: // wrapper type to box into | |
1747 case _adapter_collect_args: // array type to collect into | |
1748 case _adapter_spread_args: // array type to spread from | |
1749 if (!java_lang_Class::is_instance(argument()) | |
1750 || java_lang_Class::is_primitive(argument())) | |
1751 { err = "adapter requires argument of type java.lang.Class"; break; } | |
1752 if (ek == _adapter_collect_args || | |
1753 ek == _adapter_spread_args) { | |
1754 // Make sure it is a suitable collection type. (Array, for now.) | |
1755 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument())); | |
1756 if (!ak->oop_is_objArray()) { | |
1757 { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; } | |
1758 } | |
1759 } | |
1760 break; | |
1761 case _adapter_flyby: | |
1762 case _adapter_ricochet: | |
1763 if (!java_dyn_MethodHandle::is_instance(argument())) | |
1764 { err = "MethodHandle adapter argument required"; break; } | |
1765 break; | |
1766 default: | |
1767 if (argument.not_null()) | |
1768 { err = "adapter has spurious argument"; break; } | |
1769 break; | |
1770 } | |
1771 } | |
1772 | |
1773 if (err == NULL) { | |
1774 // Check that the src/dest types are supplied if needed. | |
1775 switch (ek) { | |
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1776 case _adapter_check_cast: |
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1777 if (src != T_OBJECT || dest != T_OBJECT) { |
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1778 err = "adapter requires object src/dest conversion subfields"; |
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1779 } |
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1780 break; |
710 | 1781 case _adapter_prim_to_prim: |
1782 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) { | |
1783 err = "adapter requires primitive src/dest conversion subfields"; break; | |
1784 } | |
1785 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) || | |
1786 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) { | |
1787 err = "adapter cannot convert beween floating and fixed-point"; break; | |
1788 } | |
1789 break; | |
1790 case _adapter_ref_to_prim: | |
1791 if (src != T_OBJECT || !is_java_primitive(dest) | |
1792 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) { | |
1793 err = "adapter requires primitive dest conversion subfield"; break; | |
1794 } | |
1795 break; | |
1796 case _adapter_prim_to_ref: | |
1797 if (!is_java_primitive(src) || dest != T_OBJECT | |
1798 || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) { | |
1799 err = "adapter requires primitive src conversion subfield"; break; | |
1800 } | |
1801 break; | |
1802 case _adapter_swap_args: | |
1803 case _adapter_rot_args: | |
1804 { | |
1805 if (!src || src != dest) { | |
1806 err = "adapter requires src/dest conversion subfields for swap"; break; | |
1807 } | |
1808 int swap_size = type2size[src]; | |
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1809 oop src_mtype = sun_dyn_AdapterMethodHandle::type(mh()); |
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1810 oop dest_mtype = sun_dyn_AdapterMethodHandle::type(target()); |
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1811 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(target()); |
710 | 1812 int src_slot = argslot; |
1813 int dest_slot = vminfo; | |
1814 bool rotate_up = (src_slot > dest_slot); // upward rotation | |
1815 int src_arg = argnum; | |
1816 int dest_arg = argument_slot_to_argnum(dest_mtype, dest_slot); | |
1817 verify_vmargslot(mh, dest_arg, dest_slot, CHECK); | |
1818 if (!(dest_slot >= src_slot + swap_size) && | |
1819 !(src_slot >= dest_slot + swap_size)) { | |
1820 err = "source, destination slots must be distinct"; | |
1821 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) { | |
1822 err = "source of swap must be deeper in stack"; | |
1823 } else if (ek == _adapter_swap_args) { | |
1824 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, dest_arg), | |
1825 java_dyn_MethodType::ptype(dest_mtype, src_arg), | |
1826 dest_arg); | |
1827 } else if (ek == _adapter_rot_args) { | |
1828 if (rotate_up) { | |
1829 assert((src_slot > dest_slot) && (src_arg < dest_arg), ""); | |
1830 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot] | |
1831 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1] | |
1832 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) { | |
1833 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), | |
1834 java_dyn_MethodType::ptype(dest_mtype, i-1), | |
1835 i); | |
1836 } | |
1837 } else { // rotate down | |
1838 assert((src_slot < dest_slot) && (src_arg > dest_arg), ""); | |
1839 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss] | |
1840 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg] | |
1841 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) { | |
1842 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), | |
1843 java_dyn_MethodType::ptype(dest_mtype, i+1), | |
1844 i); | |
1845 } | |
1846 } | |
1847 } | |
1848 if (err == NULL) | |
1849 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, src_arg), | |
1850 java_dyn_MethodType::ptype(dest_mtype, dest_arg), | |
1851 src_arg); | |
1852 } | |
1853 break; | |
1854 case _adapter_collect_args: | |
1855 case _adapter_spread_args: | |
1856 { | |
1857 BasicType coll_type = (ek == _adapter_collect_args) ? dest : src; | |
1858 BasicType elem_type = (ek == _adapter_collect_args) ? src : dest; | |
1859 if (coll_type != T_OBJECT || elem_type != T_OBJECT) { | |
1860 err = "adapter requires src/dest subfields"; break; | |
1861 // later: | |
1862 // - consider making coll be a primitive array | |
1863 // - consider making coll be a heterogeneous collection | |
1864 } | |
1865 } | |
1866 break; | |
1867 default: | |
1868 if (src != 0 || dest != 0) { | |
1869 err = "adapter has spurious src/dest conversion subfields"; break; | |
1870 } | |
1871 break; | |
1872 } | |
1873 } | |
1874 | |
1875 if (err == NULL) { | |
1876 // Check the stack_move subfield. | |
1877 // It must always report the net change in stack size, positive or negative. | |
1878 int slots_pushed = stack_move / stack_move_unit(); | |
1879 switch (ek) { | |
1880 case _adapter_prim_to_prim: | |
1881 case _adapter_ref_to_prim: | |
1882 case _adapter_prim_to_ref: | |
1883 if (slots_pushed != type2size[dest] - type2size[src]) { | |
1884 err = "wrong stack motion for primitive conversion"; | |
1885 } | |
1886 break; | |
1887 case _adapter_dup_args: | |
1888 if (slots_pushed <= 0) { | |
1889 err = "adapter requires conversion subfield slots_pushed > 0"; | |
1890 } | |
1891 break; | |
1892 case _adapter_drop_args: | |
1893 if (slots_pushed >= 0) { | |
1894 err = "adapter requires conversion subfield slots_pushed < 0"; | |
1895 } | |
1896 break; | |
1897 case _adapter_collect_args: | |
1898 if (slots_pushed > 1) { | |
1899 err = "adapter requires conversion subfield slots_pushed <= 1"; | |
1900 } | |
1901 break; | |
1902 case _adapter_spread_args: | |
1903 if (slots_pushed < -1) { | |
1904 err = "adapter requires conversion subfield slots_pushed >= -1"; | |
1905 } | |
1906 break; | |
1907 default: | |
1908 if (stack_move != 0) { | |
1909 err = "adapter has spurious stack_move conversion subfield"; | |
1910 } | |
1911 break; | |
1912 } | |
1913 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) { | |
1914 err = "stack_move conversion subfield must be multiple of stack_move_unit"; | |
1915 } | |
1916 } | |
1917 | |
1918 if (err == NULL) { | |
1919 // Make sure this adapter does not push too deeply. | |
1920 int slots_pushed = stack_move / stack_move_unit(); | |
1921 int this_vmslots = java_dyn_MethodHandle::vmslots(mh()); | |
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1922 int target_vmslots = java_dyn_MethodHandle::vmslots(target()); |
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1923 if (slots_pushed != (target_vmslots - this_vmslots)) { |
710 | 1924 err = "stack_move inconsistent with previous and current MethodType vmslots"; |
1925 } else if (slots_pushed > 0) { | |
1926 // verify stack_move against MethodHandlePushLimit | |
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1927 int target_pushes = decode_MethodHandle_stack_pushes(target()); |
710 | 1928 // do not blow the stack; use a Java-based adapter if this limit is exceeded |
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1929 if (slots_pushed + target_pushes > MethodHandlePushLimit) { |
710 | 1930 err = "adapter pushes too many parameters"; |
1931 } | |
1932 } | |
1933 | |
1934 // While we're at it, check that the stack motion decoder works: | |
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1935 DEBUG_ONLY(int target_pushes = decode_MethodHandle_stack_pushes(target())); |
710 | 1936 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); |
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1937 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct"); |
710 | 1938 } |
1939 | |
1940 if (err == NULL && vminfo != 0) { | |
1941 switch (ek) { | |
1942 case _adapter_swap_args: | |
1943 case _adapter_rot_args: | |
1944 break; // OK | |
1945 default: | |
1946 err = "vminfo subfield is reserved to the JVM"; | |
1947 } | |
1948 } | |
1949 | |
1950 // Do additional ad hoc checks. | |
1951 if (err == NULL) { | |
1952 switch (ek) { | |
1953 case _adapter_retype_only: | |
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1954 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false); |
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1955 break; |
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1956 |
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1957 case _adapter_retype_raw: |
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1958 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true); |
710 | 1959 break; |
1960 | |
1961 case _adapter_check_cast: | |
1962 { | |
1963 // The actual value being checked must be a reference: | |
1964 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype(), argnum), | |
1965 object_java_mirror(), argnum); | |
1966 if (err != NULL) break; | |
1967 | |
1968 // The output of the cast must fit with the destination argument: | |
1969 Handle cast_class = argument; | |
1970 err = check_method_type_conversion(src_mtype(), | |
1971 argnum, cast_class(), | |
1972 dst_mtype()); | |
1973 } | |
1974 break; | |
1975 | |
1976 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles | |
1977 } | |
1978 } | |
1979 | |
1980 if (err != NULL) { | |
1981 throw_InternalError_for_bad_conversion(conversion, err, THREAD); | |
1982 return; | |
1983 } | |
1984 | |
1985 } | |
1986 | |
1987 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { | |
1988 oop argument = sun_dyn_AdapterMethodHandle::argument(mh()); | |
1989 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); | |
1990 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); | |
1991 jint conv_op = adapter_conversion_op(conversion); | |
1992 | |
1993 // adjust the adapter code to the internal EntryKind enumeration: | |
1994 EntryKind ek_orig = adapter_entry_kind(conv_op); | |
1995 EntryKind ek_opt = ek_orig; // may be optimized | |
1996 | |
1997 // Finalize the vmtarget field (Java initialized it to null). | |
1998 if (!java_dyn_MethodHandle::is_instance(target())) { | |
1999 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD); | |
2000 return; | |
2001 } | |
2002 sun_dyn_AdapterMethodHandle::set_vmtarget(mh(), target()); | |
2003 | |
2004 if (VerifyMethodHandles) { | |
2005 verify_AdapterMethodHandle(mh, argnum, CHECK); | |
2006 } | |
2007 | |
2008 int stack_move = adapter_conversion_stack_move(conversion); | |
2009 BasicType src = adapter_conversion_src_type(conversion); | |
2010 BasicType dest = adapter_conversion_dest_type(conversion); | |
2011 int vminfo = adapter_conversion_vminfo(conversion); // should be zero | |
2012 | |
2013 const char* err = NULL; | |
2014 | |
2015 // Now it's time to finish the case analysis and pick a MethodHandleEntry. | |
2016 switch (ek_orig) { | |
2017 case _adapter_retype_only: | |
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2018 case _adapter_retype_raw: |
710 | 2019 case _adapter_check_cast: |
2020 case _adapter_dup_args: | |
2021 case _adapter_drop_args: | |
2022 // these work fine via general case code | |
2023 break; | |
2024 | |
2025 case _adapter_prim_to_prim: | |
2026 { | |
2027 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}. | |
2028 // And, the {float,double} -> {int,long} cases must be handled by Java. | |
2029 switch (type2size[src] *4+ type2size[dest]) { | |
2030 case 1 *4+ 1: | |
2031 assert(src == T_INT || is_subword_type(src), "source is not float"); | |
2032 // Subword-related cases are int -> {boolean,byte,char,short}. | |
2033 ek_opt = _adapter_opt_i2i; | |
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2034 vminfo = adapter_prim_to_prim_subword_vminfo(dest); |
710 | 2035 break; |
2036 case 2 *4+ 1: | |
2037 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) { | |
2038 ek_opt = _adapter_opt_l2i; | |
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2039 vminfo = adapter_prim_to_prim_subword_vminfo(dest); |
710 | 2040 } else if (src == T_DOUBLE && dest == T_FLOAT) { |
2041 ek_opt = _adapter_opt_d2f; | |
2042 } else { | |
2043 assert(false, ""); | |
2044 } | |
2045 break; | |
2046 case 1 *4+ 2: | |
2047 if (src == T_INT && dest == T_LONG) { | |
2048 ek_opt = _adapter_opt_i2l; | |
2049 } else if (src == T_FLOAT && dest == T_DOUBLE) { | |
2050 ek_opt = _adapter_opt_f2d; | |
2051 } else { | |
2052 assert(false, ""); | |
2053 } | |
2054 break; | |
2055 default: | |
2056 assert(false, ""); | |
2057 break; | |
2058 } | |
2059 } | |
2060 break; | |
2061 | |
2062 case _adapter_ref_to_prim: | |
2063 { | |
2064 switch (type2size[dest]) { | |
2065 case 1: | |
2066 ek_opt = _adapter_opt_unboxi; | |
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2067 vminfo = adapter_unbox_subword_vminfo(dest); |
710 | 2068 break; |
2069 case 2: | |
2070 ek_opt = _adapter_opt_unboxl; | |
2071 break; | |
2072 default: | |
2073 assert(false, ""); | |
2074 break; | |
2075 } | |
2076 } | |
2077 break; | |
2078 | |
2079 case _adapter_prim_to_ref: | |
2080 goto throw_not_impl; // allocates, hence could block | |
2081 | |
2082 case _adapter_swap_args: | |
2083 case _adapter_rot_args: | |
2084 { | |
2085 int swap_slots = type2size[src]; | |
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2086 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(mh()); |
710 | 2087 int src_slot = argslot; |
2088 int dest_slot = vminfo; | |
2089 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1; | |
2090 switch (swap_slots) { | |
2091 case 1: | |
2092 ek_opt = (!rotate ? _adapter_opt_swap_1 : | |
2093 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down); | |
2094 break; | |
2095 case 2: | |
2096 ek_opt = (!rotate ? _adapter_opt_swap_2 : | |
2097 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down); | |
2098 break; | |
2099 default: | |
2100 assert(false, ""); | |
2101 break; | |
2102 } | |
2103 } | |
2104 break; | |
2105 | |
2106 case _adapter_collect_args: | |
2107 goto throw_not_impl; // allocates, hence could block | |
2108 | |
2109 case _adapter_spread_args: | |
2110 { | |
2111 // vminfo will be the required length of the array | |
2112 int slots_pushed = stack_move / stack_move_unit(); | |
2113 int array_size = slots_pushed + 1; | |
2114 assert(array_size >= 0, ""); | |
2115 vminfo = array_size; | |
2116 switch (array_size) { | |
2117 case 0: ek_opt = _adapter_opt_spread_0; break; | |
2118 case 1: ek_opt = _adapter_opt_spread_1; break; | |
2119 default: ek_opt = _adapter_opt_spread_more; break; | |
2120 } | |
2121 if ((vminfo & CONV_VMINFO_MASK) != vminfo) | |
2122 goto throw_not_impl; // overflow | |
2123 } | |
2124 break; | |
2125 | |
2126 case _adapter_flyby: | |
2127 case _adapter_ricochet: | |
2128 goto throw_not_impl; // runs Java code, hence could block | |
2129 | |
2130 default: | |
2131 // should have failed much earlier; must be a missing case here | |
2132 assert(false, "incomplete switch"); | |
2133 // and fall through: | |
2134 | |
2135 throw_not_impl: | |
2136 // FIXME: these adapters are NYI | |
2137 err = "adapter not yet implemented in the JVM"; | |
2138 break; | |
2139 } | |
2140 | |
2141 if (err != NULL) { | |
2142 throw_InternalError_for_bad_conversion(conversion, err, THREAD); | |
2143 return; | |
2144 } | |
2145 | |
2146 // Rebuild the conversion value; maybe parts of it were changed. | |
2147 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo); | |
2148 | |
2149 // Finalize the conversion field. (Note that it is final to Java code.) | |
2150 sun_dyn_AdapterMethodHandle::set_conversion(mh(), new_conversion); | |
2151 | |
2152 // Done! | |
2153 java_dyn_MethodHandle::set_vmentry(mh(), entry(ek_opt)); | |
2154 | |
2155 // There should be enough memory barriers on exit from native methods | |
2156 // to ensure that the MH is fully initialized to all threads before | |
2157 // Java code can publish it in global data structures. | |
2158 } | |
2159 | |
2160 // | |
2161 // Here are the native methods on sun.dyn.MethodHandleImpl. | |
2162 // They are the private interface between this JVM and the HotSpot-specific | |
2163 // Java code that implements JSR 292 method handles. | |
2164 // | |
2165 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way | |
2166 // that intrinsic (non-JNI) native methods are defined in HotSpot. | |
2167 // | |
2168 | |
2169 // direct method handles for invokestatic or invokespecial | |
2170 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller); | |
2171 JVM_ENTRY(void, MHI_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
2172 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) { | |
2173 ResourceMark rm; // for error messages | |
2174 | |
2175 // This is the guy we are initializing: | |
2176 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2177 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
2178 | |
2179 // Early returns out of this method leave the DMH in an unfinished state. | |
2180 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
2181 | |
2182 // which method are we really talking about? | |
2183 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2184 oop target_oop = JNIHandles::resolve_non_null(target_jh); | |
2185 if (sun_dyn_MemberName::is_instance(target_oop) && | |
2186 sun_dyn_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) { | |
2187 Handle mname(THREAD, target_oop); | |
2188 MethodHandles::resolve_MemberName(mname, CHECK); | |
2189 target_oop = mname(); // in case of GC | |
2190 } | |
2191 | |
2192 int decode_flags = 0; klassOop receiver_limit = NULL; | |
2193 methodHandle m(THREAD, | |
2194 MethodHandles::decode_method(target_oop, | |
2195 receiver_limit, decode_flags)); | |
2196 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); } | |
2197 | |
2198 // The trusted Java code that calls this method should already have performed | |
2199 // access checks on behalf of the given caller. But, we can verify this. | |
2200 if (VerifyMethodHandles && caller_jh != NULL) { | |
2201 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh))); | |
2202 // If this were a bytecode, the first access check would be against | |
2203 // the "reference class" mentioned in the CONSTANT_Methodref. | |
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2204 // We don't know at this point which class that was, and if we |
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2205 // check against m.method_holder we might get the wrong answer. |
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2206 // So we just make sure to handle this check when the resolution |
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2207 // happens, when we call resolve_MemberName. |
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2208 // |
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2209 // (A public class can inherit public members from private supers, |
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2210 // and it would be wrong to check access against the private super |
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2211 // if the original symbolic reference was against the public class.) |
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2212 // |
710 | 2213 // If there were a bytecode, the next step would be to lookup the method |
2214 // in the reference class, then then check the method's access bits. | |
2215 // Emulate LinkResolver::check_method_accessability. | |
2216 klassOop resolved_klass = m->method_holder(); | |
2217 if (!Reflection::verify_field_access(caller->as_klassOop(), | |
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2218 resolved_klass, resolved_klass, |
710 | 2219 m->access_flags(), |
2220 true)) { | |
2221 // %%% following cutout belongs in Reflection::verify_field_access? | |
2222 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(), | |
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2223 resolved_klass, THREAD); |
710 | 2224 if (!same_pm) { |
2225 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string()); | |
2226 } | |
2227 } | |
2228 } | |
2229 | |
2230 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK); | |
2231 } | |
2232 JVM_END | |
2233 | |
2234 // bound method handles | |
2235 JVM_ENTRY(void, MHI_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
2236 jobject target_jh, int argnum)) { | |
2237 ResourceMark rm; // for error messages | |
2238 | |
2239 // This is the guy we are initializing: | |
2240 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2241 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
2242 | |
2243 // Early returns out of this method leave the BMH in an unfinished state. | |
2244 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
2245 | |
2246 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2247 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); | |
2248 | |
2249 if (!java_dyn_MethodHandle::is_instance(target())) { | |
2250 // Target object is a reflective method. (%%% Do we need this alternate path?) | |
2251 Untested("init_BMH of non-MH"); | |
2252 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); } | |
2253 int decode_flags = 0; klassOop receiver_limit_oop = NULL; | |
2254 methodHandle m(THREAD, | |
2255 MethodHandles::decode_method(target(), | |
2256 receiver_limit_oop, | |
2257 decode_flags)); | |
2258 KlassHandle receiver_limit(THREAD, receiver_limit_oop); | |
2259 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m, | |
2260 receiver_limit, | |
2261 decode_flags, | |
2262 CHECK); | |
2263 return; | |
2264 } | |
2265 | |
2266 // Build a BMH on top of a DMH or another BMH: | |
2267 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK); | |
2268 } | |
2269 JVM_END | |
2270 | |
2271 // adapter method handles | |
2272 JVM_ENTRY(void, MHI_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
2273 jobject target_jh, int argnum)) { | |
2274 // This is the guy we are initializing: | |
2275 if (mh_jh == NULL || target_jh == NULL) { | |
2276 THROW(vmSymbols::java_lang_InternalError()); | |
2277 } | |
2278 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
2279 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); | |
2280 | |
2281 // Early returns out of this method leave the AMH in an unfinished state. | |
2282 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
2283 | |
2284 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK); | |
2285 } | |
2286 JVM_END | |
2287 | |
2288 // method type forms | |
2289 JVM_ENTRY(void, MHI_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) { | |
2290 if (erased_jh == NULL) return; | |
2291 if (TraceMethodHandles) { | |
2292 tty->print("creating MethodType form "); | |
2293 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH! | |
2294 // call Object.toString() | |
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2295 Symbol* name = vmSymbols::toString_name(); |
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2296 Symbol* sig = vmSymbols::void_string_signature(); |
710 | 2297 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh))); |
2298 JavaValue result(T_OBJECT); | |
1142 | 2299 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig, |
710 | 2300 &args, CHECK); |
2301 Handle str(THREAD, (oop)result.get_jobject()); | |
2302 java_lang_String::print(str, tty); | |
2303 } | |
2304 tty->cr(); | |
2305 } | |
2306 } | |
2307 JVM_END | |
2308 | |
2309 // debugging and reflection | |
2310 JVM_ENTRY(jobject, MHI_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) { | |
2311 Handle mh(THREAD, JNIHandles::resolve(mh_jh)); | |
2312 if (!java_dyn_MethodHandle::is_instance(mh())) { | |
2313 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); | |
2314 } | |
2315 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL); | |
2316 return JNIHandles::make_local(THREAD, target); | |
2317 } | |
2318 JVM_END | |
2319 | |
2320 JVM_ENTRY(jint, MHI_getConstant(JNIEnv *env, jobject igcls, jint which)) { | |
2321 switch (which) { | |
2322 case MethodHandles::GC_JVM_PUSH_LIMIT: | |
2323 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF, | |
2324 "MethodHandlePushLimit parameter must be in valid range"); | |
2325 return MethodHandlePushLimit; | |
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2326 case MethodHandles::GC_JVM_STACK_MOVE_UNIT: |
710 | 2327 // return number of words per slot, signed according to stack direction |
2328 return MethodHandles::stack_move_unit(); | |
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2329 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK: |
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2330 return MethodHandles::adapter_conversion_ops_supported_mask(); |
710 | 2331 } |
2332 return 0; | |
2333 } | |
2334 JVM_END | |
2335 | |
2336 #ifndef PRODUCT | |
2337 #define EACH_NAMED_CON(template) \ | |
2338 template(MethodHandles,GC_JVM_PUSH_LIMIT) \ | |
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2339 template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) \ |
710 | 2340 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \ |
2341 template(MethodHandles,ETF_DIRECT_HANDLE) \ | |
2342 template(MethodHandles,ETF_METHOD_NAME) \ | |
2343 template(MethodHandles,ETF_REFLECT_METHOD) \ | |
2344 template(sun_dyn_MemberName,MN_IS_METHOD) \ | |
2345 template(sun_dyn_MemberName,MN_IS_CONSTRUCTOR) \ | |
2346 template(sun_dyn_MemberName,MN_IS_FIELD) \ | |
2347 template(sun_dyn_MemberName,MN_IS_TYPE) \ | |
2348 template(sun_dyn_MemberName,MN_SEARCH_SUPERCLASSES) \ | |
2349 template(sun_dyn_MemberName,MN_SEARCH_INTERFACES) \ | |
2350 template(sun_dyn_MemberName,VM_INDEX_UNINITIALIZED) \ | |
2351 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_ONLY) \ | |
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2352 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_RAW) \ |
710 | 2353 template(sun_dyn_AdapterMethodHandle,OP_CHECK_CAST) \ |
2354 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_PRIM) \ | |
2355 template(sun_dyn_AdapterMethodHandle,OP_REF_TO_PRIM) \ | |
2356 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_REF) \ | |
2357 template(sun_dyn_AdapterMethodHandle,OP_SWAP_ARGS) \ | |
2358 template(sun_dyn_AdapterMethodHandle,OP_ROT_ARGS) \ | |
2359 template(sun_dyn_AdapterMethodHandle,OP_DUP_ARGS) \ | |
2360 template(sun_dyn_AdapterMethodHandle,OP_DROP_ARGS) \ | |
2361 template(sun_dyn_AdapterMethodHandle,OP_COLLECT_ARGS) \ | |
2362 template(sun_dyn_AdapterMethodHandle,OP_SPREAD_ARGS) \ | |
2363 template(sun_dyn_AdapterMethodHandle,OP_FLYBY) \ | |
2364 template(sun_dyn_AdapterMethodHandle,OP_RICOCHET) \ | |
2365 template(sun_dyn_AdapterMethodHandle,CONV_OP_LIMIT) \ | |
2366 template(sun_dyn_AdapterMethodHandle,CONV_OP_MASK) \ | |
2367 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_MASK) \ | |
2368 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_SHIFT) \ | |
2369 template(sun_dyn_AdapterMethodHandle,CONV_OP_SHIFT) \ | |
2370 template(sun_dyn_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \ | |
2371 template(sun_dyn_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \ | |
2372 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \ | |
2373 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \ | |
2374 /*end*/ | |
2375 | |
2376 #define ONE_PLUS(scope,value) 1+ | |
2377 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0; | |
2378 #define VALUE_COMMA(scope,value) scope::value, | |
2379 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 }; | |
2380 #define STRING_NULL(scope,value) #value "\0" | |
2381 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) }; | |
2382 | |
2383 #undef ONE_PLUS | |
2384 #undef VALUE_COMMA | |
2385 #undef STRING_NULL | |
2386 #undef EACH_NAMED_CON | |
2387 #endif | |
2388 | |
2389 JVM_ENTRY(jint, MHI_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { | |
2390 #ifndef PRODUCT | |
2391 if (which >= 0 && which < con_value_count) { | |
2392 int con = con_values[which]; | |
2393 objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh); | |
2394 if (box != NULL && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { | |
2395 const char* str = &con_names[0]; | |
2396 for (int i = 0; i < which; i++) | |
2397 str += strlen(str) + 1; // skip name and null | |
2398 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); | |
2399 box->obj_at_put(0, name); | |
2400 } | |
2401 return con; | |
2402 } | |
2403 #endif | |
2404 return 0; | |
2405 } | |
2406 JVM_END | |
2407 | |
2408 // void init(MemberName self, AccessibleObject ref) | |
2409 JVM_ENTRY(void, MHI_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { | |
2410 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2411 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
2412 oop target_oop = JNIHandles::resolve_non_null(target_jh); | |
2413 MethodHandles::init_MemberName(mname(), target_oop); | |
2414 } | |
2415 JVM_END | |
2416 | |
2417 // void expand(MemberName self) | |
2418 JVM_ENTRY(void, MHI_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { | |
2419 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2420 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
2421 MethodHandles::expand_MemberName(mname, 0, CHECK); | |
2422 } | |
2423 JVM_END | |
2424 | |
2425 // void resolve(MemberName self, Class<?> caller) | |
2426 JVM_ENTRY(void, MHI_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { | |
2427 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
2428 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
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2429 |
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2430 // The trusted Java code that calls this method should already have performed |
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2431 // access checks on behalf of the given caller. But, we can verify this. |
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2432 if (VerifyMethodHandles && caller_jh != NULL) { |
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2433 klassOop reference_klass = java_lang_Class::as_klassOop(sun_dyn_MemberName::clazz(mname())); |
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2434 if (reference_klass != NULL) { |
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2435 // Emulate LinkResolver::check_klass_accessability. |
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2436 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)); |
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2437 if (!Reflection::verify_class_access(caller, |
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2438 reference_klass, |
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2439 true)) { |
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2440 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name()); |
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2441 } |
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2442 } |
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2443 } |
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2444 |
710 | 2445 MethodHandles::resolve_MemberName(mname, CHECK); |
2446 } | |
2447 JVM_END | |
2448 | |
2449 // static native int getMembers(Class<?> defc, String matchName, String matchSig, | |
2450 // int matchFlags, Class<?> caller, int skip, MemberName[] results); | |
2451 JVM_ENTRY(jint, MHI_getMembers(JNIEnv *env, jobject igcls, | |
2452 jclass clazz_jh, jstring name_jh, jstring sig_jh, | |
2453 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { | |
2454 if (clazz_jh == NULL || results_jh == NULL) return -1; | |
2455 klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)); | |
2456 | |
2457 objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh); | |
2458 if (results == NULL || !results->is_objArray()) return -1; | |
2459 | |
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2460 TempNewSymbol name = NULL; |
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2461 TempNewSymbol sig = NULL; |
710 | 2462 if (name_jh != NULL) { |
2463 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); | |
2464 if (name == NULL) return 0; // a match is not possible | |
2465 } | |
2466 if (sig_jh != NULL) { | |
2467 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); | |
2468 if (sig == NULL) return 0; // a match is not possible | |
2469 } | |
2470 | |
2471 klassOop caller = NULL; | |
2472 if (caller_jh != NULL) { | |
2473 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); | |
2474 if (!java_lang_Class::is_instance(caller_oop)) return -1; | |
2475 caller = java_lang_Class::as_klassOop(caller_oop); | |
2476 } | |
2477 | |
2478 if (name != NULL && sig != NULL && results != NULL) { | |
2479 // try a direct resolve | |
2480 // %%% TO DO | |
2481 } | |
2482 | |
2483 int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags, | |
2484 caller, skip, results); | |
2485 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks | |
2486 return res; | |
2487 } | |
2488 JVM_END | |
2489 | |
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2490 JVM_ENTRY(void, MHI_registerBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh, jobject bsm_jh)) { |
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2491 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD); |
1660
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2492 if (!AllowTransitionalJSR292) { |
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2493 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), |
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2494 "registerBootstrapMethod is only supported in JSR 292 EDR"); |
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2495 } |
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2496 ik->link_class(CHECK); |
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2497 if (!java_dyn_MethodHandle::is_instance(JNIHandles::resolve(bsm_jh))) { |
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2498 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "method handle"); |
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2499 } |
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|
2500 const char* err = NULL; |
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2501 if (ik->is_initialized() || ik->is_in_error_state()) { |
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2502 err = "too late: class is already initialized"; |
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|
2503 } else { |
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2504 ObjectLocker ol(ik, THREAD); // note: this should be a recursive lock |
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2505 if (ik->is_not_initialized() || |
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2506 (ik->is_being_initialized() && ik->is_reentrant_initialization(THREAD))) { |
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2507 if (ik->bootstrap_method() != NULL) { |
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|
2508 err = "class is already equipped with a bootstrap method"; |
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|
2509 } else { |
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2510 ik->set_bootstrap_method(JNIHandles::resolve_non_null(bsm_jh)); |
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2511 err = NULL; |
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|
2512 } |
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|
2513 } else { |
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|
2514 err = "class is already initialized"; |
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|
2515 if (ik->is_being_initialized()) |
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|
2516 err = "class is already being initialized in a different thread"; |
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|
2517 } |
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|
2518 } |
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2519 if (err != NULL) { |
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2520 THROW_MSG(vmSymbols::java_lang_IllegalStateException(), err); |
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|
2521 } |
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|
2522 } |
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|
2523 JVM_END |
710 | 2524 |
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2525 JVM_ENTRY(jobject, MHI_getBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh)) { |
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2526 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD); |
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2527 return JNIHandles::make_local(THREAD, ik->bootstrap_method()); |
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|
2528 } |
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|
2529 JVM_END |
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diff
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|
2530 |
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2531 JVM_ENTRY(void, MHI_setCallSiteTarget(JNIEnv *env, jobject igcls, jobject site_jh, jobject target_jh)) { |
726
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|
2532 // No special action required, yet. |
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|
2533 oop site_oop = JNIHandles::resolve(site_jh); |
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2534 if (!java_dyn_CallSite::is_instance(site_oop)) |
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2535 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "not a CallSite"); |
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2536 java_dyn_CallSite::set_target(site_oop, JNIHandles::resolve(target_jh)); |
726
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|
2537 } |
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|
2538 JVM_END |
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|
2539 |
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|
2540 |
710 | 2541 /// JVM_RegisterMethodHandleMethods |
2542 | |
2543 #define ADR "J" | |
2544 | |
2545 #define LANG "Ljava/lang/" | |
2546 #define JDYN "Ljava/dyn/" | |
2547 #define IDYN "Lsun/dyn/" | |
2548 | |
2549 #define OBJ LANG"Object;" | |
2550 #define CLS LANG"Class;" | |
2551 #define STRG LANG"String;" | |
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2552 #define CST JDYN"CallSite;" |
710 | 2553 #define MT JDYN"MethodType;" |
2554 #define MH JDYN"MethodHandle;" | |
2555 #define MHI IDYN"MethodHandleImpl;" | |
2556 #define MEM IDYN"MemberName;" | |
2557 #define AMH IDYN"AdapterMethodHandle;" | |
2558 #define BMH IDYN"BoundMethodHandle;" | |
2559 #define DMH IDYN"DirectMethodHandle;" | |
2560 | |
2561 #define CC (char*) /*cast a literal from (const char*)*/ | |
2562 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) | |
2563 | |
2564 // These are the native methods on sun.dyn.MethodHandleNatives. | |
2565 static JNINativeMethod methods[] = { | |
2566 // void init(MemberName self, AccessibleObject ref) | |
2567 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHI_init_AMH)}, | |
2568 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHI_init_BMH)}, | |
2569 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHI_init_DMH)}, | |
2570 {CC"init", CC"("MT")V", FN_PTR(MHI_init_MT)}, | |
2571 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHI_init_Mem)}, | |
2572 {CC"expand", CC"("MEM")V", FN_PTR(MHI_expand_Mem)}, | |
2573 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHI_resolve_Mem)}, | |
2574 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHI_getTarget)}, | |
2575 {CC"getConstant", CC"(I)I", FN_PTR(MHI_getConstant)}, | |
2576 // static native int getNamedCon(int which, Object[] name) | |
2577 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHI_getNamedCon)}, | |
2578 // static native int getMembers(Class<?> defc, String matchName, String matchSig, | |
2579 // int matchFlags, Class<?> caller, int skip, MemberName[] results); | |
2580 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHI_getMembers)} | |
2581 }; | |
2582 | |
726
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diff
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|
2583 // More entry points specifically for EnableInvokeDynamic. |
be93aad57795
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diff
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|
2584 static JNINativeMethod methods2[] = { |
1507
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2585 {CC"registerBootstrap", CC"("CLS MH")V", FN_PTR(MHI_registerBootstrap)}, |
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diff
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|
2586 {CC"getBootstrap", CC"("CLS")"MH, FN_PTR(MHI_getBootstrap)}, |
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2587 {CC"setCallSiteTarget", CC"("CST MH")V", FN_PTR(MHI_setCallSiteTarget)} |
726
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diff
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|
2588 }; |
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6655646: dynamic languages need dynamically linked call sites
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diff
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|
2589 |
710 | 2590 |
2591 // This one function is exported, used by NativeLookup. | |
2592 | |
2593 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { | |
2594 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK"); | |
2595 | |
726
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diff
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|
2596 // note: this explicit warning-producing stuff will be replaced by auto-detection of the JSR 292 classes |
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diff
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2597 |
710 | 2598 if (!EnableMethodHandles) { |
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|
2599 warning("JSR 292 method handles are disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableMethodHandles to enable."); |
710 | 2600 return; // bind nothing |
2601 } | |
2602 | |
1039
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2603 bool enable_MH = true; |
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|
2604 |
710 | 2605 { |
2606 ThreadToNativeFromVM ttnfv(thread); | |
2607 | |
2608 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod)); | |
2609 if (env->ExceptionOccurred()) { | |
2610 MethodHandles::set_enabled(false); | |
2611 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); | |
1039
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2612 enable_MH = false; |
710 | 2613 env->ExceptionClear(); |
2614 } | |
2615 } | |
726
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|
2616 |
1039
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2617 if (enable_MH) { |
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2618 KlassHandle MHI_klass = SystemDictionaryHandles::MethodHandleImpl_klass(); |
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2619 if (MHI_klass.not_null()) { |
2177
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2620 TempNewSymbol raiseException_name = SymbolTable::new_symbol("raiseException", CHECK); |
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2621 TempNewSymbol raiseException_sig = SymbolTable::new_symbol("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK); |
1039
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2622 methodOop raiseException_method = instanceKlass::cast(MHI_klass->as_klassOop()) |
2177
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2623 ->find_method(raiseException_name, raiseException_sig); |
1039
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2624 if (raiseException_method != NULL && raiseException_method->is_static()) { |
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2625 MethodHandles::set_raise_exception_method(raiseException_method); |
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2626 } else { |
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2627 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); |
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2628 enable_MH = false; |
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|
2629 } |
2116
d810e9a3fc33
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|
2630 } else { |
d810e9a3fc33
7010180: JSR 292 InvokeDynamicPrintArgs fails with: assert(_adapter == NULL) failed: init'd to NULL
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|
2631 enable_MH = false; |
1039
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|
2632 } |
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|
2633 } |
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|
2634 |
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|
2635 if (enable_MH) { |
2116
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|
2636 // We need to link the MethodHandleImpl klass before we generate |
d810e9a3fc33
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2637 // the method handle adapters as the _raise_exception adapter uses |
d810e9a3fc33
7010180: JSR 292 InvokeDynamicPrintArgs fails with: assert(_adapter == NULL) failed: init'd to NULL
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|
2638 // one of its methods (and its c2i-adapter). |
d810e9a3fc33
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2639 KlassHandle k = SystemDictionaryHandles::MethodHandleImpl_klass(); |
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|
2640 instanceKlass* ik = instanceKlass::cast(k()); |
d810e9a3fc33
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|
2641 ik->link_class(CHECK); |
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2642 |
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2643 MethodHandles::generate_adapters(); |
1039
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2644 MethodHandles::set_enabled(true); |
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|
2645 } |
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|
2646 |
726
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2647 if (!EnableInvokeDynamic) { |
1039
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|
2648 warning("JSR 292 invokedynamic is disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableInvokeDynamic to enable."); |
726
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2649 return; // bind nothing |
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|
2650 } |
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2651 |
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2652 { |
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2653 ThreadToNativeFromVM ttnfv(thread); |
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2654 |
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2655 int status = env->RegisterNatives(MHN_class, methods2, sizeof(methods2)/sizeof(JNINativeMethod)); |
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2656 if (env->ExceptionOccurred()) { |
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2657 MethodHandles::set_enabled(false); |
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2658 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); |
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2659 env->ExceptionClear(); |
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2660 } else { |
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2661 MethodHandles::set_enabled(true); |
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2662 } |
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2663 } |
710 | 2664 } |
2665 JVM_END |