Mercurial > hg > truffle
annotate src/share/vm/prims/methodHandles.cpp @ 1490:f03d0a26bf83
6888954: argument formatting for assert() and friends
Reviewed-by: kvn, twisti, apetrusenko, never, dcubed
| author | jcoomes |
|---|---|
| date | Thu, 22 Apr 2010 13:23:15 -0700 |
| parents | 9eba43136cb5 |
| children | cd5dbf694d45 |
| rev | line source |
|---|---|
| 710 | 1 /* |
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2 * Copyright 2008-2010 Sun Microsystems, Inc. All Rights Reserved. |
| 710 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 /* | |
| 26 * JSR 292 reference implementation: method handles | |
| 27 */ | |
| 28 | |
| 29 #include "incls/_precompiled.incl" | |
| 30 #include "incls/_methodHandles.cpp.incl" | |
| 31 | |
| 32 bool MethodHandles::_enabled = false; // set true after successful native linkage | |
| 33 | |
| 34 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL}; | |
| 35 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = { | |
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36 "raise_exception", |
| 710 | 37 "invokestatic", // how a MH emulates invokestatic |
| 38 "invokespecial", // ditto for the other invokes... | |
| 39 "invokevirtual", | |
| 40 "invokeinterface", | |
| 41 "bound_ref", // these are for BMH... | |
| 42 "bound_int", | |
| 43 "bound_long", | |
| 44 "bound_ref_direct", // (direct versions have a direct methodOop) | |
| 45 "bound_int_direct", | |
| 46 "bound_long_direct", | |
| 47 | |
| 48 // starting at _adapter_mh_first: | |
| 49 "adapter_retype_only", // these are for AMH... | |
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50 "adapter_retype_raw", |
| 710 | 51 "adapter_check_cast", |
| 52 "adapter_prim_to_prim", | |
| 53 "adapter_ref_to_prim", | |
| 54 "adapter_prim_to_ref", | |
| 55 "adapter_swap_args", | |
| 56 "adapter_rot_args", | |
| 57 "adapter_dup_args", | |
| 58 "adapter_drop_args", | |
| 59 "adapter_collect_args", | |
| 60 "adapter_spread_args", | |
| 61 "adapter_flyby", | |
| 62 "adapter_ricochet", | |
| 63 | |
| 64 // optimized adapter types: | |
| 65 "adapter_swap_args/1", | |
| 66 "adapter_swap_args/2", | |
| 67 "adapter_rot_args/1,up", | |
| 68 "adapter_rot_args/1,down", | |
| 69 "adapter_rot_args/2,up", | |
| 70 "adapter_rot_args/2,down", | |
| 71 "adapter_prim_to_prim/i2i", | |
| 72 "adapter_prim_to_prim/l2i", | |
| 73 "adapter_prim_to_prim/d2f", | |
| 74 "adapter_prim_to_prim/i2l", | |
| 75 "adapter_prim_to_prim/f2d", | |
| 76 "adapter_ref_to_prim/unboxi", | |
| 77 "adapter_ref_to_prim/unboxl", | |
| 78 "adapter_spread_args/0", | |
| 79 "adapter_spread_args/1", | |
| 80 "adapter_spread_args/more", | |
| 81 | |
| 82 NULL | |
| 83 }; | |
| 84 | |
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85 // Adapters. |
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86 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; |
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87 int MethodHandles::_adapter_code_size = StubRoutines::method_handles_adapters_code_size; |
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88 |
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89 jobject MethodHandles::_raise_exception_method; |
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90 |
| 710 | 91 #ifdef ASSERT |
| 92 bool MethodHandles::spot_check_entry_names() { | |
| 93 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), ""); | |
| 94 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), ""); | |
| 95 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), ""); | |
| 96 assert(!strcmp(entry_name(_adapter_ricochet), "adapter_ricochet"), ""); | |
| 97 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), ""); | |
| 98 return true; | |
| 99 } | |
| 100 #endif | |
| 101 | |
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102 |
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103 //------------------------------------------------------------------------------ |
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104 // MethodHandles::generate_adapters |
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105 // |
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106 void MethodHandles::generate_adapters() { |
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107 if (!EnableMethodHandles || SystemDictionary::MethodHandle_klass() == NULL) return; |
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108 |
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109 assert(_adapter_code == NULL, "generate only once"); |
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110 |
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111 ResourceMark rm; |
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112 TraceTime timer("MethodHandles adapters generation", TraceStartupTime); |
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113 _adapter_code = MethodHandlesAdapterBlob::create(_adapter_code_size); |
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114 if (_adapter_code == NULL) |
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115 vm_exit_out_of_memory(_adapter_code_size, "CodeCache: no room for MethodHandles adapters"); |
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116 CodeBuffer code(_adapter_code->instructions_begin(), _adapter_code->instructions_size()); |
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117 |
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118 MethodHandlesAdapterGenerator g(&code); |
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119 g.generate(); |
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120 } |
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121 |
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122 |
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123 //------------------------------------------------------------------------------ |
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124 // MethodHandlesAdapterGenerator::generate |
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125 // |
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126 void MethodHandlesAdapterGenerator::generate() { |
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127 // Generate generic method handle adapters. |
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128 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST; |
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129 ek < MethodHandles::_EK_LIMIT; |
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130 ek = MethodHandles::EntryKind(1 + (int)ek)) { |
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131 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek)); |
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132 MethodHandles::generate_method_handle_stub(_masm, ek); |
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133 } |
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134 } |
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135 |
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136 |
| 710 | 137 void MethodHandles::set_enabled(bool z) { |
| 138 if (_enabled != z) { | |
| 139 guarantee(z && EnableMethodHandles, "can only enable once, and only if -XX:+EnableMethodHandles"); | |
| 140 _enabled = z; | |
| 141 } | |
| 142 } | |
| 143 | |
| 144 // Note: A method which does not have a TRAPS argument cannot block in the GC | |
| 145 // or throw exceptions. Such methods are used in this file to do something quick | |
| 146 // and local, like parse a data structure. For speed, such methods work on plain | |
| 147 // oops, not handles. Trapping methods uniformly operate on handles. | |
| 148 | |
| 149 methodOop MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype, | |
| 150 klassOop& receiver_limit_result, int& decode_flags_result) { | |
| 151 if (vmtarget == NULL) return NULL; | |
| 152 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding"); | |
| 153 if (vmindex < 0) { | |
| 154 // this DMH performs no dispatch; it is directly bound to a methodOop | |
| 155 // A MemberName may either be directly bound to a methodOop, | |
| 156 // or it may use the klass/index form; both forms mean the same thing. | |
| 157 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result); | |
| 158 if ((decode_flags_result & _dmf_has_receiver) != 0 | |
| 159 && java_dyn_MethodType::is_instance(mtype)) { | |
| 160 // Extract receiver type restriction from mtype.ptypes[0]. | |
| 161 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype); | |
| 162 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0); | |
| 163 if (java_lang_Class::is_instance(ptype0)) | |
| 164 receiver_limit_result = java_lang_Class::as_klassOop(ptype0); | |
| 165 } | |
| 166 if (vmindex == methodOopDesc::nonvirtual_vtable_index) { | |
| 167 // this DMH can be an "invokespecial" version | |
| 168 decode_flags_result &= ~_dmf_does_dispatch; | |
| 169 } else { | |
| 170 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?"); | |
| 171 } | |
| 172 return m; | |
| 173 } else { | |
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174 assert(vmtarget->is_klass(), "must be class or interface"); |
| 710 | 175 decode_flags_result |= MethodHandles::_dmf_does_dispatch; |
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176 decode_flags_result |= MethodHandles::_dmf_has_receiver; |
| 710 | 177 receiver_limit_result = (klassOop)vmtarget; |
| 178 Klass* tk = Klass::cast((klassOop)vmtarget); | |
| 179 if (tk->is_interface()) { | |
| 180 // an itable linkage is <interface, itable index> | |
| 181 decode_flags_result |= MethodHandles::_dmf_from_interface; | |
| 182 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex); | |
| 183 } else { | |
| 184 if (!tk->oop_is_instance()) | |
| 1142 | 185 tk = instanceKlass::cast(SystemDictionary::Object_klass()); |
| 710 | 186 return ((instanceKlass*)tk)->method_at_vtable(vmindex); |
| 187 } | |
| 188 } | |
| 189 } | |
| 190 | |
| 191 // MemberName and DirectMethodHandle have the same linkage to the JVM internals. | |
| 192 // (MemberName is the non-operational name used for queries and setup.) | |
| 193 | |
| 194 methodOop MethodHandles::decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
| 195 oop vmtarget = sun_dyn_DirectMethodHandle::vmtarget(mh); | |
| 196 int vmindex = sun_dyn_DirectMethodHandle::vmindex(mh); | |
| 197 oop mtype = sun_dyn_DirectMethodHandle::type(mh); | |
| 198 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result); | |
| 199 } | |
| 200 | |
| 201 methodOop MethodHandles::decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
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202 assert(sun_dyn_BoundMethodHandle::is_instance(mh), ""); |
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203 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), ""); |
| 710 | 204 for (oop bmh = mh;;) { |
| 205 // Bound MHs can be stacked to bind several arguments. | |
| 206 oop target = java_dyn_MethodHandle::vmtarget(bmh); | |
| 207 if (target == NULL) return NULL; | |
| 208 decode_flags_result |= MethodHandles::_dmf_binds_argument; | |
| 209 klassOop tk = target->klass(); | |
| 210 if (tk == SystemDictionary::BoundMethodHandle_klass()) { | |
| 211 bmh = target; | |
| 212 continue; | |
| 213 } else { | |
| 214 if (java_dyn_MethodHandle::is_subclass(tk)) { | |
| 215 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH"); | |
| 216 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result); | |
| 217 } else { | |
| 218 // Optimized case: binding a receiver to a non-dispatched DMH | |
| 219 // short-circuits directly to the methodOop. | |
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220 // (It might be another argument besides a receiver also.) |
| 710 | 221 assert(target->is_method(), "must be a simple method"); |
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222 decode_flags_result |= MethodHandles::_dmf_binds_method; |
| 710 | 223 methodOop m = (methodOop) target; |
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224 if (!m->is_static()) |
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225 decode_flags_result |= MethodHandles::_dmf_has_receiver; |
| 710 | 226 return m; |
| 227 } | |
| 228 } | |
| 229 } | |
| 230 } | |
| 231 | |
| 232 methodOop MethodHandles::decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
| 233 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), ""); | |
| 234 for (oop amh = mh;;) { | |
| 235 // Adapter MHs can be stacked to convert several arguments. | |
| 236 int conv_op = adapter_conversion_op(sun_dyn_AdapterMethodHandle::conversion(amh)); | |
| 237 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK; | |
| 238 oop target = java_dyn_MethodHandle::vmtarget(amh); | |
| 239 if (target == NULL) return NULL; | |
| 240 klassOop tk = target->klass(); | |
| 241 if (tk == SystemDictionary::AdapterMethodHandle_klass()) { | |
| 242 amh = target; | |
| 243 continue; | |
| 244 } else { | |
| 245 // must be a BMH (which will bind some more arguments) or a DMH (for the final call) | |
| 246 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result); | |
| 247 } | |
| 248 } | |
| 249 } | |
| 250 | |
| 251 methodOop MethodHandles::decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { | |
| 252 if (mh == NULL) return NULL; | |
| 253 klassOop mhk = mh->klass(); | |
| 254 assert(java_dyn_MethodHandle::is_subclass(mhk), "must be a MethodHandle"); | |
| 255 if (mhk == SystemDictionary::DirectMethodHandle_klass()) { | |
| 256 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
| 257 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) { | |
| 258 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
| 259 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) { | |
| 260 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result); | |
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261 } else if (sun_dyn_BoundMethodHandle::is_subclass(mhk)) { |
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262 // could be a JavaMethodHandle (but not an adapter MH) |
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263 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); |
| 710 | 264 } else { |
| 265 assert(false, "cannot parse this MH"); | |
| 266 return NULL; // random MH? | |
| 267 } | |
| 268 } | |
| 269 | |
| 270 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) { | |
| 271 assert(m->is_method(), ""); | |
| 272 if (m->is_static()) { | |
| 273 // check that signature begins '(L' or '([' (not '(I', '()', etc.) | |
| 274 symbolOop sig = m->signature(); | |
| 275 BasicType recv_bt = char2type(sig->byte_at(1)); | |
| 276 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')' | |
| 277 assert(sig->byte_at(0) == '(', "must be method sig"); | |
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278 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY) |
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279 // decode_flags_result |= _dmf_has_receiver; |
| 710 | 280 } else { |
| 281 // non-static method | |
| 282 decode_flags_result |= _dmf_has_receiver; | |
| 283 if (!m->can_be_statically_bound() && !m->is_initializer()) { | |
| 284 decode_flags_result |= _dmf_does_dispatch; | |
| 285 if (Klass::cast(m->method_holder())->is_interface()) | |
| 286 decode_flags_result |= _dmf_from_interface; | |
| 287 } | |
| 288 } | |
| 289 return m; | |
| 290 } | |
| 291 | |
| 292 | |
| 293 // A trusted party is handing us a cookie to determine a method. | |
| 294 // Let's boil it down to the method oop they really want. | |
| 295 methodOop MethodHandles::decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result) { | |
| 296 decode_flags_result = 0; | |
| 297 receiver_limit_result = NULL; | |
| 298 klassOop xk = x->klass(); | |
| 299 if (xk == Universe::methodKlassObj()) { | |
| 300 return decode_methodOop((methodOop) x, decode_flags_result); | |
| 301 } else if (xk == SystemDictionary::MemberName_klass()) { | |
| 302 // Note: This only works if the MemberName has already been resolved. | |
| 303 return decode_MemberName(x, receiver_limit_result, decode_flags_result); | |
| 304 } else if (java_dyn_MethodHandle::is_subclass(xk)) { | |
| 305 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result); | |
| 1142 | 306 } else if (xk == SystemDictionary::reflect_Method_klass()) { |
| 710 | 307 oop clazz = java_lang_reflect_Method::clazz(x); |
| 308 int slot = java_lang_reflect_Method::slot(x); | |
| 309 klassOop k = java_lang_Class::as_klassOop(clazz); | |
| 310 if (k != NULL && Klass::cast(k)->oop_is_instance()) | |
| 311 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), | |
| 312 decode_flags_result); | |
| 1142 | 313 } else if (xk == SystemDictionary::reflect_Constructor_klass()) { |
| 710 | 314 oop clazz = java_lang_reflect_Constructor::clazz(x); |
| 315 int slot = java_lang_reflect_Constructor::slot(x); | |
| 316 klassOop k = java_lang_Class::as_klassOop(clazz); | |
| 317 if (k != NULL && Klass::cast(k)->oop_is_instance()) | |
| 318 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), | |
| 319 decode_flags_result); | |
| 320 } else { | |
| 321 // unrecognized object | |
| 322 assert(!x->is_method(), "already checked"); | |
| 323 assert(!sun_dyn_MemberName::is_instance(x), "already checked"); | |
| 324 } | |
| 325 return NULL; | |
| 326 } | |
| 327 | |
| 328 | |
| 329 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) { | |
| 330 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass()) | |
| 331 return 0; // no push/pop | |
| 332 int this_vmslots = java_dyn_MethodHandle::vmslots(mh); | |
| 333 int last_vmslots = 0; | |
| 334 oop last_mh = mh; | |
| 335 for (;;) { | |
| 336 oop target = java_dyn_MethodHandle::vmtarget(last_mh); | |
| 337 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { | |
| 338 last_vmslots = java_dyn_MethodHandle::vmslots(target); | |
| 339 break; | |
| 340 } else if (!java_dyn_MethodHandle::is_instance(target)) { | |
| 341 // might be klass or method | |
| 342 assert(target->is_method(), "must get here with a direct ref to method"); | |
| 343 last_vmslots = methodOop(target)->size_of_parameters(); | |
| 344 break; | |
| 345 } | |
| 346 last_mh = target; | |
| 347 } | |
| 348 // If I am called with fewer VM slots than my ultimate callee, | |
| 349 // it must be that I push the additionally needed slots. | |
| 350 // Likewise if am called with more VM slots, I will pop them. | |
| 351 return (last_vmslots - this_vmslots); | |
| 352 } | |
| 353 | |
| 354 | |
| 355 // MemberName support | |
| 356 | |
| 357 // import sun_dyn_MemberName.* | |
| 358 enum { | |
| 359 IS_METHOD = sun_dyn_MemberName::MN_IS_METHOD, | |
| 360 IS_CONSTRUCTOR = sun_dyn_MemberName::MN_IS_CONSTRUCTOR, | |
| 361 IS_FIELD = sun_dyn_MemberName::MN_IS_FIELD, | |
| 362 IS_TYPE = sun_dyn_MemberName::MN_IS_TYPE, | |
| 363 SEARCH_SUPERCLASSES = sun_dyn_MemberName::MN_SEARCH_SUPERCLASSES, | |
| 364 SEARCH_INTERFACES = sun_dyn_MemberName::MN_SEARCH_INTERFACES, | |
| 365 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE, | |
| 366 VM_INDEX_UNINITIALIZED = sun_dyn_MemberName::VM_INDEX_UNINITIALIZED | |
| 367 }; | |
| 368 | |
| 369 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) { | |
| 1142 | 370 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) { |
| 710 | 371 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() |
| 372 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() | |
| 373 int mods = java_lang_reflect_Field::modifiers(target_oop); | |
| 374 klassOop k = java_lang_Class::as_klassOop(clazz); | |
| 375 int offset = instanceKlass::cast(k)->offset_from_fields(slot); | |
| 376 init_MemberName(mname_oop, k, accessFlags_from(mods), offset); | |
| 377 } else { | |
| 378 int decode_flags = 0; klassOop receiver_limit = NULL; | |
| 379 methodOop m = MethodHandles::decode_method(target_oop, | |
| 380 receiver_limit, decode_flags); | |
| 381 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); | |
| 382 init_MemberName(mname_oop, m, do_dispatch); | |
| 383 } | |
| 384 } | |
| 385 | |
| 386 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) { | |
| 387 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD) | |
| 388 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS )); | |
| 389 oop vmtarget = m; | |
| 390 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet | |
| 391 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound()) | |
| 392 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch | |
| 393 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value"); | |
| 394 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); | |
| 395 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); | |
| 396 sun_dyn_MemberName::set_flags(mname_oop, flags); | |
| 397 } | |
| 398 | |
| 399 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) { | |
| 400 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS )); | |
| 401 oop vmtarget = field_holder; | |
| 402 int vmindex = offset; // implies no info yet | |
| 403 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex"); | |
| 404 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); | |
| 405 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); | |
| 406 sun_dyn_MemberName::set_flags(mname_oop, flags); | |
| 407 } | |
| 408 | |
| 409 | |
| 410 methodOop MethodHandles::decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result) { | |
| 411 int flags = sun_dyn_MemberName::flags(mname); | |
| 412 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return NULL; // not invocable | |
| 413 oop vmtarget = sun_dyn_MemberName::vmtarget(mname); | |
| 414 int vmindex = sun_dyn_MemberName::vmindex(mname); | |
| 415 if (vmindex == VM_INDEX_UNINITIALIZED) return NULL; // not resolved | |
|
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416 methodOop m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result); |
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417 oop clazz = sun_dyn_MemberName::clazz(mname); |
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418 if (clazz != NULL && java_lang_Class::is_instance(clazz)) { |
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419 klassOop klass = java_lang_Class::as_klassOop(clazz); |
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420 if (klass != NULL) receiver_limit_result = klass; |
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421 } |
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422 return m; |
| 710 | 423 } |
| 424 | |
| 425 // An unresolved member name is a mere symbolic reference. | |
| 426 // Resolving it plants a vmtarget/vmindex in it, | |
| 427 // which refers dirctly to JVM internals. | |
| 428 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) { | |
| 429 assert(sun_dyn_MemberName::is_instance(mname()), ""); | |
| 430 #ifdef ASSERT | |
| 431 // If this assert throws, renegotiate the sentinel value used by the Java code, | |
| 432 // so that it is distinct from any valid vtable index value, and any special | |
| 433 // values defined in methodOopDesc::VtableIndexFlag. | |
| 434 // The point of the slop is to give the Java code and the JVM some room | |
| 435 // to independently specify sentinel values. | |
| 436 const int sentinel_slop = 10; | |
| 437 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop; | |
| 438 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels"); | |
| 439 #endif | |
| 440 if (sun_dyn_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED) | |
| 441 return; // already resolved | |
| 442 oop defc_oop = sun_dyn_MemberName::clazz(mname()); | |
| 443 oop name_str = sun_dyn_MemberName::name(mname()); | |
| 444 oop type_str = sun_dyn_MemberName::type(mname()); | |
| 445 int flags = sun_dyn_MemberName::flags(mname()); | |
| 446 | |
| 447 if (defc_oop == NULL || name_str == NULL || type_str == NULL) { | |
| 448 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve"); | |
| 449 } | |
| 450 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop); | |
| 451 defc_oop = NULL; // safety | |
| 452 if (defc_klassOop == NULL) return; // a primitive; no resolution possible | |
| 453 if (!Klass::cast(defc_klassOop)->oop_is_instance()) { | |
| 454 if (!Klass::cast(defc_klassOop)->oop_is_array()) return; | |
| 1142 | 455 defc_klassOop = SystemDictionary::Object_klass(); |
| 710 | 456 } |
| 457 instanceKlassHandle defc(THREAD, defc_klassOop); | |
| 458 defc_klassOop = NULL; // safety | |
| 459 if (defc.is_null()) { | |
| 460 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class"); | |
| 461 } | |
| 462 defc->link_class(CHECK); | |
| 463 | |
| 464 // convert the external string name to an internal symbol | |
| 465 symbolHandle name(THREAD, java_lang_String::as_symbol_or_null(name_str)); | |
| 466 if (name.is_null()) return; // no such name | |
| 467 name_str = NULL; // safety | |
| 468 | |
| 469 // convert the external string or reflective type to an internal signature | |
| 470 bool force_signature = (name() == vmSymbols::invoke_name()); | |
| 471 symbolHandle type; { | |
| 472 symbolOop type_sym = NULL; | |
| 473 if (java_dyn_MethodType::is_instance(type_str)) { | |
| 474 type_sym = java_dyn_MethodType::as_signature(type_str, force_signature, CHECK); | |
| 475 } else if (java_lang_Class::is_instance(type_str)) { | |
| 476 type_sym = java_lang_Class::as_signature(type_str, force_signature, CHECK); | |
| 477 } else if (java_lang_String::is_instance(type_str)) { | |
| 478 if (force_signature) { | |
| 479 type = java_lang_String::as_symbol(type_str, CHECK); | |
| 480 } else { | |
| 481 type_sym = java_lang_String::as_symbol_or_null(type_str); | |
| 482 } | |
| 483 } else { | |
| 484 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized type"); | |
| 485 } | |
| 486 if (type_sym != NULL) | |
| 487 type = symbolHandle(THREAD, type_sym); | |
| 488 } | |
| 489 if (type.is_null()) return; // no such signature exists in the VM | |
| 490 type_str = NULL; // safety | |
| 491 | |
| 492 // Time to do the lookup. | |
| 493 switch (flags & ALL_KINDS) { | |
| 494 case IS_METHOD: | |
| 495 { | |
| 496 CallInfo result; | |
| 497 { | |
| 498 EXCEPTION_MARK; | |
| 499 if ((flags & JVM_ACC_STATIC) != 0) { | |
| 500 LinkResolver::resolve_static_call(result, | |
| 501 defc, name, type, KlassHandle(), false, false, THREAD); | |
| 502 } else if (defc->is_interface()) { | |
| 503 LinkResolver::resolve_interface_call(result, Handle(), defc, | |
| 504 defc, name, type, KlassHandle(), false, false, THREAD); | |
| 505 } else { | |
| 506 LinkResolver::resolve_virtual_call(result, Handle(), defc, | |
| 507 defc, name, type, KlassHandle(), false, false, THREAD); | |
| 508 } | |
| 509 if (HAS_PENDING_EXCEPTION) { | |
| 510 CLEAR_PENDING_EXCEPTION; | |
| 511 return; | |
| 512 } | |
| 513 } | |
| 514 methodHandle m = result.resolved_method(); | |
| 515 oop vmtarget = NULL; | |
| 516 int vmindex = methodOopDesc::nonvirtual_vtable_index; | |
| 517 if (defc->is_interface()) { | |
| 518 vmindex = klassItable::compute_itable_index(m()); | |
| 519 assert(vmindex >= 0, ""); | |
| 520 } else if (result.has_vtable_index()) { | |
| 521 vmindex = result.vtable_index(); | |
| 522 assert(vmindex >= 0, ""); | |
| 523 } | |
| 524 assert(vmindex != VM_INDEX_UNINITIALIZED, ""); | |
| 525 if (vmindex < 0) { | |
| 526 assert(result.is_statically_bound(), ""); | |
| 527 vmtarget = m(); | |
| 528 } else { | |
| 529 vmtarget = result.resolved_klass()->as_klassOop(); | |
| 530 } | |
| 531 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); | |
| 532 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
| 533 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
| 534 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
| 535 DEBUG_ONLY(int junk; klassOop junk2); | |
| 536 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), | |
| 537 "properly stored for later decoding"); | |
| 538 return; | |
| 539 } | |
| 540 case IS_CONSTRUCTOR: | |
| 541 { | |
| 542 CallInfo result; | |
| 543 { | |
| 544 EXCEPTION_MARK; | |
| 545 if (name() == vmSymbols::object_initializer_name()) { | |
| 546 LinkResolver::resolve_special_call(result, | |
| 547 defc, name, type, KlassHandle(), false, THREAD); | |
| 548 } else { | |
| 549 break; // will throw after end of switch | |
| 550 } | |
| 551 if (HAS_PENDING_EXCEPTION) { | |
| 552 CLEAR_PENDING_EXCEPTION; | |
| 553 return; | |
| 554 } | |
| 555 } | |
| 556 assert(result.is_statically_bound(), ""); | |
| 557 methodHandle m = result.resolved_method(); | |
| 558 oop vmtarget = m(); | |
| 559 int vmindex = methodOopDesc::nonvirtual_vtable_index; | |
| 560 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); | |
| 561 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
| 562 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
| 563 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
| 564 DEBUG_ONLY(int junk; klassOop junk2); | |
| 565 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), | |
| 566 "properly stored for later decoding"); | |
| 567 return; | |
| 568 } | |
| 569 case IS_FIELD: | |
| 570 { | |
| 571 // This is taken from LinkResolver::resolve_field, sans access checks. | |
| 572 fieldDescriptor fd; // find_field initializes fd if found | |
| 573 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name(), type(), &fd)); | |
| 574 // check if field exists; i.e., if a klass containing the field def has been selected | |
| 575 if (sel_klass.is_null()) return; | |
| 576 oop vmtarget = sel_klass->as_klassOop(); | |
| 577 int vmindex = fd.offset(); | |
| 578 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS); | |
| 579 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen | |
| 580 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); | |
| 581 sun_dyn_MemberName::set_vmindex(mname(), vmindex); | |
| 582 sun_dyn_MemberName::set_modifiers(mname(), mods); | |
| 583 return; | |
| 584 } | |
| 585 } | |
| 586 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); | |
| 587 } | |
| 588 | |
| 589 // Conversely, a member name which is only initialized from JVM internals | |
| 590 // may have null defc, name, and type fields. | |
| 591 // Resolving it plants a vmtarget/vmindex in it, | |
| 592 // which refers directly to JVM internals. | |
| 593 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { | |
| 594 assert(sun_dyn_MemberName::is_instance(mname()), ""); | |
| 595 oop vmtarget = sun_dyn_MemberName::vmtarget(mname()); | |
| 596 int vmindex = sun_dyn_MemberName::vmindex(mname()); | |
| 597 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) { | |
| 598 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); | |
| 599 } | |
| 600 | |
| 601 bool have_defc = (sun_dyn_MemberName::clazz(mname()) != NULL); | |
| 602 bool have_name = (sun_dyn_MemberName::name(mname()) != NULL); | |
| 603 bool have_type = (sun_dyn_MemberName::type(mname()) != NULL); | |
| 604 int flags = sun_dyn_MemberName::flags(mname()); | |
| 605 | |
| 606 if (suppress != 0) { | |
| 607 if (suppress & _suppress_defc) have_defc = true; | |
| 608 if (suppress & _suppress_name) have_name = true; | |
| 609 if (suppress & _suppress_type) have_type = true; | |
| 610 } | |
| 611 | |
| 612 if (have_defc && have_name && have_type) return; // nothing needed | |
| 613 | |
| 614 switch (flags & ALL_KINDS) { | |
| 615 case IS_METHOD: | |
| 616 case IS_CONSTRUCTOR: | |
| 617 { | |
| 618 klassOop receiver_limit = NULL; | |
| 619 int decode_flags = 0; | |
| 620 methodHandle m(THREAD, decode_vmtarget(vmtarget, vmindex, NULL, | |
| 621 receiver_limit, decode_flags)); | |
| 622 if (m.is_null()) break; | |
| 623 if (!have_defc) { | |
| 624 klassOop defc = m->method_holder(); | |
| 625 if (receiver_limit != NULL && receiver_limit != defc | |
| 626 && Klass::cast(receiver_limit)->is_subtype_of(defc)) | |
| 627 defc = receiver_limit; | |
| 628 sun_dyn_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror()); | |
| 629 } | |
| 630 if (!have_name) { | |
| 631 //not java_lang_String::create_from_symbol; let's intern member names | |
| 632 Handle name = StringTable::intern(m->name(), CHECK); | |
| 633 sun_dyn_MemberName::set_name(mname(), name()); | |
| 634 } | |
| 635 if (!have_type) { | |
| 636 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); | |
| 637 sun_dyn_MemberName::set_type(mname(), type()); | |
| 638 } | |
| 639 return; | |
| 640 } | |
| 641 case IS_FIELD: | |
| 642 { | |
| 643 // This is taken from LinkResolver::resolve_field, sans access checks. | |
| 644 if (!vmtarget->is_klass()) break; | |
| 645 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break; | |
| 646 instanceKlassHandle defc(THREAD, (klassOop) vmtarget); | |
| 647 bool is_static = ((flags & JVM_ACC_STATIC) != 0); | |
| 648 fieldDescriptor fd; // find_field initializes fd if found | |
| 649 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) | |
| 650 break; // cannot expand | |
| 651 if (!have_defc) { | |
| 652 sun_dyn_MemberName::set_clazz(mname(), defc->java_mirror()); | |
| 653 } | |
| 654 if (!have_name) { | |
| 655 //not java_lang_String::create_from_symbol; let's intern member names | |
| 656 Handle name = StringTable::intern(fd.name(), CHECK); | |
| 657 sun_dyn_MemberName::set_name(mname(), name()); | |
| 658 } | |
| 659 if (!have_type) { | |
| 660 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK); | |
| 661 sun_dyn_MemberName::set_type(mname(), type()); | |
| 662 } | |
| 663 return; | |
| 664 } | |
| 665 } | |
| 666 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); | |
| 667 } | |
| 668 | |
| 669 int MethodHandles::find_MemberNames(klassOop k, | |
| 670 symbolOop name, symbolOop sig, | |
| 671 int mflags, klassOop caller, | |
| 672 int skip, objArrayOop results) { | |
| 673 DEBUG_ONLY(No_Safepoint_Verifier nsv); | |
| 674 // this code contains no safepoints! | |
| 675 | |
| 676 // %%% take caller into account! | |
| 677 | |
| 678 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1; | |
| 679 | |
| 680 int rfill = 0, rlimit = results->length(), rskip = skip; | |
| 681 // overflow measurement: | |
| 682 int overflow = 0, overflow_limit = MAX2(1000, rlimit); | |
| 683 | |
| 684 int match_flags = mflags; | |
| 685 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); | |
| 686 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); | |
| 687 bool local_only = !(search_superc | search_intfc); | |
| 688 bool classes_only = false; | |
| 689 | |
| 690 if (name != NULL) { | |
| 691 if (name->utf8_length() == 0) return 0; // a match is not possible | |
| 692 } | |
| 693 if (sig != NULL) { | |
| 694 if (sig->utf8_length() == 0) return 0; // a match is not possible | |
| 695 if (sig->byte_at(0) == '(') | |
| 696 match_flags &= ~(IS_FIELD | IS_TYPE); | |
| 697 else | |
| 698 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); | |
| 699 } | |
| 700 | |
| 701 if ((match_flags & IS_TYPE) != 0) { | |
| 702 // NYI, and Core Reflection works quite well for this query | |
| 703 } | |
| 704 | |
| 705 if ((match_flags & IS_FIELD) != 0) { | |
| 706 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { | |
| 707 if (name != NULL && st.name() != name) | |
| 708 continue; | |
| 709 if (sig != NULL && st.signature() != sig) | |
| 710 continue; | |
| 711 // passed the filters | |
| 712 if (rskip > 0) { | |
| 713 --rskip; | |
| 714 } else if (rfill < rlimit) { | |
| 715 oop result = results->obj_at(rfill++); | |
| 716 if (!sun_dyn_MemberName::is_instance(result)) | |
| 717 return -99; // caller bug! | |
| 718 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset()); | |
| 719 } else if (++overflow >= overflow_limit) { | |
| 720 match_flags = 0; break; // got tired of looking at overflow | |
| 721 } | |
| 722 } | |
| 723 } | |
| 724 | |
| 725 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { | |
| 726 // watch out for these guys: | |
| 727 symbolOop init_name = vmSymbols::object_initializer_name(); | |
| 728 symbolOop clinit_name = vmSymbols::class_initializer_name(); | |
| 729 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> | |
| 730 bool negate_name_test = false; | |
| 731 // fix name so that it captures the intention of IS_CONSTRUCTOR | |
| 732 if (!(match_flags & IS_METHOD)) { | |
| 733 // constructors only | |
| 734 if (name == NULL) { | |
| 735 name = init_name; | |
| 736 } else if (name != init_name) { | |
| 737 return 0; // no constructors of this method name | |
| 738 } | |
| 739 } else if (!(match_flags & IS_CONSTRUCTOR)) { | |
| 740 // methods only | |
| 741 if (name == NULL) { | |
| 742 name = init_name; | |
| 743 negate_name_test = true; // if we see the name, we *omit* the entry | |
| 744 } else if (name == init_name) { | |
| 745 return 0; // no methods of this constructor name | |
| 746 } | |
| 747 } else { | |
| 748 // caller will accept either sort; no need to adjust name | |
| 749 } | |
| 750 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { | |
| 751 methodOop m = st.method(); | |
| 752 symbolOop m_name = m->name(); | |
| 753 if (m_name == clinit_name) | |
| 754 continue; | |
| 755 if (name != NULL && ((m_name != name) ^ negate_name_test)) | |
| 756 continue; | |
| 757 if (sig != NULL && m->signature() != sig) | |
| 758 continue; | |
| 759 // passed the filters | |
| 760 if (rskip > 0) { | |
| 761 --rskip; | |
| 762 } else if (rfill < rlimit) { | |
| 763 oop result = results->obj_at(rfill++); | |
| 764 if (!sun_dyn_MemberName::is_instance(result)) | |
| 765 return -99; // caller bug! | |
| 766 MethodHandles::init_MemberName(result, m, true); | |
| 767 } else if (++overflow >= overflow_limit) { | |
| 768 match_flags = 0; break; // got tired of looking at overflow | |
| 769 } | |
| 770 } | |
| 771 } | |
| 772 | |
| 773 // return number of elements we at leasted wanted to initialize | |
| 774 return rfill + overflow; | |
| 775 } | |
| 776 | |
| 777 | |
| 778 | |
| 779 | |
| 780 // Decode the vmtarget field of a method handle. | |
| 781 // Sanitize out methodOops, klassOops, and any other non-Java data. | |
| 782 // This is for debugging and reflection. | |
| 783 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) { | |
| 784 assert(java_dyn_MethodHandle::is_instance(mh()), "must be a MH"); | |
| 785 if (format == ETF_HANDLE_OR_METHOD_NAME) { | |
| 786 oop target = java_dyn_MethodHandle::vmtarget(mh()); | |
| 787 if (target == NULL) { | |
| 788 return NULL; // unformed MH | |
| 789 } | |
| 790 klassOop tklass = target->klass(); | |
| 1142 | 791 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) { |
| 710 | 792 return target; // target is another MH (or something else?) |
| 793 } | |
| 794 } | |
| 795 if (format == ETF_DIRECT_HANDLE) { | |
| 796 oop target = mh(); | |
| 797 for (;;) { | |
| 798 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { | |
| 799 return target; | |
| 800 } | |
| 801 if (!java_dyn_MethodHandle::is_instance(target)){ | |
| 802 return NULL; // unformed MH | |
| 803 } | |
| 804 target = java_dyn_MethodHandle::vmtarget(target); | |
| 805 } | |
| 806 } | |
| 807 // cases of metadata in MH.vmtarget: | |
| 808 // - AMH can have methodOop for static invoke with bound receiver | |
| 809 // - DMH can have methodOop for static invoke (on variable receiver) | |
| 810 // - DMH can have klassOop for dispatched (non-static) invoke | |
| 811 klassOop receiver_limit = NULL; | |
| 812 int decode_flags = 0; | |
| 813 methodOop m = decode_MethodHandle(mh(), receiver_limit, decode_flags); | |
| 814 if (m == NULL) return NULL; | |
| 815 switch (format) { | |
| 816 case ETF_REFLECT_METHOD: | |
| 817 // same as jni_ToReflectedMethod: | |
| 818 if (m->is_initializer()) { | |
| 819 return Reflection::new_constructor(m, THREAD); | |
| 820 } else { | |
| 821 return Reflection::new_method(m, UseNewReflection, false, THREAD); | |
| 822 } | |
| 823 | |
| 824 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle | |
| 825 case ETF_METHOD_NAME: | |
| 826 { | |
| 827 if (SystemDictionary::MemberName_klass() == NULL) break; | |
| 828 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass()); | |
| 829 mname_klass->initialize(CHECK_NULL); | |
| 830 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); | |
| 831 sun_dyn_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED); | |
| 832 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); | |
| 833 init_MemberName(mname(), m, do_dispatch); | |
| 834 expand_MemberName(mname, 0, CHECK_NULL); | |
| 835 return mname(); | |
| 836 } | |
| 837 } | |
| 838 | |
| 839 // Unknown format code. | |
| 840 char msg[50]; | |
| 841 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format); | |
| 842 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg); | |
| 843 } | |
| 844 | |
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845 static const char* always_null_names[] = { |
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846 "java/lang/Void", |
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847 "java/lang/Null", |
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848 //"java/lang/Nothing", |
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849 "sun/dyn/empty/Empty", |
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850 NULL |
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851 }; |
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852 |
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853 static bool is_always_null_type(klassOop klass) { |
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854 if (!Klass::cast(klass)->oop_is_instance()) return false; |
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855 instanceKlass* ik = instanceKlass::cast(klass); |
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856 // Must be on the boot class path: |
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857 if (ik->class_loader() != NULL) return false; |
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858 // Check the name. |
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859 symbolOop name = ik->name(); |
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860 for (int i = 0; ; i++) { |
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861 const char* test_name = always_null_names[i]; |
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862 if (test_name == NULL) break; |
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863 if (name->equals(test_name)) |
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864 return true; |
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865 } |
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866 return false; |
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867 } |
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868 |
| 710 | 869 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) { |
| 1142 | 870 if (src == dst || dst == SystemDictionary::Object_klass()) |
| 710 | 871 return false; // quickest checks |
| 872 Klass* srck = Klass::cast(src); | |
| 873 Klass* dstk = Klass::cast(dst); | |
| 874 if (dstk->is_interface()) { | |
| 875 // interface receivers can safely be viewed as untyped, | |
| 876 // because interface calls always include a dynamic check | |
| 1142 | 877 //dstk = Klass::cast(SystemDictionary::Object_klass()); |
| 710 | 878 return false; |
| 879 } | |
| 880 if (srck->is_interface()) { | |
| 881 // interface arguments must be viewed as untyped | |
| 1142 | 882 //srck = Klass::cast(SystemDictionary::Object_klass()); |
| 710 | 883 return true; |
| 884 } | |
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885 if (is_always_null_type(src)) { |
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886 // some source types are known to be never instantiated; |
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887 // they represent references which are always null |
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888 // such null references never fail to convert safely |
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889 return false; |
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890 } |
| 710 | 891 return !srck->is_subclass_of(dstk->as_klassOop()); |
| 892 } | |
| 893 | |
| 894 static oop object_java_mirror() { | |
| 1142 | 895 return Klass::cast(SystemDictionary::Object_klass())->java_mirror(); |
| 710 | 896 } |
| 897 | |
| 898 bool MethodHandles::same_basic_type_for_arguments(BasicType src, | |
| 899 BasicType dst, | |
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900 bool raw, |
| 710 | 901 bool for_return) { |
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902 if (for_return) { |
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903 // return values can always be forgotten: |
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904 if (dst == T_VOID) return true; |
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905 if (src == T_VOID) return raw && (dst == T_INT); |
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906 // We allow caller to receive a garbage int, which is harmless. |
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907 // This trick is pulled by trusted code (see VerifyType.canPassRaw). |
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908 } |
| 710 | 909 assert(src != T_VOID && dst != T_VOID, "should not be here"); |
| 910 if (src == dst) return true; | |
| 911 if (type2size[src] != type2size[dst]) return false; | |
| 912 // allow reinterpretation casts for integral widening | |
| 913 if (is_subword_type(src)) { // subwords can fit in int or other subwords | |
| 914 if (dst == T_INT) // any subword fits in an int | |
| 915 return true; | |
| 916 if (src == T_BOOLEAN) // boolean fits in any subword | |
| 917 return is_subword_type(dst); | |
| 918 if (src == T_BYTE && dst == T_SHORT) | |
| 919 return true; // remaining case: byte fits in short | |
| 920 } | |
| 921 // allow float/fixed reinterpretation casts | |
| 922 if (src == T_FLOAT) return dst == T_INT; | |
| 923 if (src == T_INT) return dst == T_FLOAT; | |
| 924 if (src == T_DOUBLE) return dst == T_LONG; | |
| 925 if (src == T_LONG) return dst == T_DOUBLE; | |
| 926 return false; | |
| 927 } | |
| 928 | |
| 929 const char* MethodHandles::check_method_receiver(methodOop m, | |
| 930 klassOop passed_recv_type) { | |
| 931 assert(!m->is_static(), "caller resp."); | |
| 932 if (passed_recv_type == NULL) | |
| 933 return "receiver type is primitive"; | |
| 934 if (class_cast_needed(passed_recv_type, m->method_holder())) { | |
| 935 Klass* formal = Klass::cast(m->method_holder()); | |
| 936 return SharedRuntime::generate_class_cast_message("receiver type", | |
| 937 formal->external_name()); | |
| 938 } | |
| 939 return NULL; // checks passed | |
| 940 } | |
| 941 | |
| 942 // Verify that m's signature can be called type-safely by a method handle | |
| 943 // of the given method type 'mtype'. | |
| 944 // It takes a TRAPS argument because it must perform symbol lookups. | |
| 945 void MethodHandles::verify_method_signature(methodHandle m, | |
| 946 Handle mtype, | |
| 947 int first_ptype_pos, | |
| 948 KlassHandle insert_ptype, | |
| 949 TRAPS) { | |
| 950 objArrayHandle ptypes(THREAD, java_dyn_MethodType::ptypes(mtype())); | |
| 951 int pnum = first_ptype_pos; | |
| 952 int pmax = ptypes->length(); | |
| 953 int mnum = 0; // method argument | |
| 954 const char* err = NULL; | |
| 955 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) { | |
| 956 oop ptype_oop = NULL; | |
| 957 if (ss.at_return_type()) { | |
| 958 if (pnum != pmax) | |
| 959 { err = "too many arguments"; break; } | |
| 960 ptype_oop = java_dyn_MethodType::rtype(mtype()); | |
| 961 } else { | |
| 962 if (pnum >= pmax) | |
| 963 { err = "not enough arguments"; break; } | |
| 964 if (pnum >= 0) | |
| 965 ptype_oop = ptypes->obj_at(pnum); | |
| 966 else if (insert_ptype.is_null()) | |
| 967 ptype_oop = NULL; | |
| 968 else | |
| 969 ptype_oop = insert_ptype->java_mirror(); | |
| 970 pnum += 1; | |
| 971 mnum += 1; | |
| 972 } | |
| 973 klassOop mklass = NULL; | |
| 974 BasicType mtype = ss.type(); | |
| 975 if (mtype == T_ARRAY) mtype = T_OBJECT; // fold all refs to T_OBJECT | |
| 976 if (mtype == T_OBJECT) { | |
| 977 if (ptype_oop == NULL) { | |
| 978 // null matches any reference | |
| 979 continue; | |
| 980 } | |
| 981 // If we fail to resolve types at this point, we will throw an error. | |
| 982 symbolOop name_oop = ss.as_symbol(CHECK); | |
| 983 symbolHandle name(THREAD, name_oop); | |
| 984 instanceKlass* mk = instanceKlass::cast(m->method_holder()); | |
| 985 Handle loader(THREAD, mk->class_loader()); | |
| 986 Handle domain(THREAD, mk->protection_domain()); | |
| 987 mklass = SystemDictionary::resolve_or_fail(name, loader, domain, | |
| 988 true, CHECK); | |
| 989 } | |
| 990 if (ptype_oop == NULL) { | |
| 991 // null does not match any non-reference; use Object to report the error | |
| 992 ptype_oop = object_java_mirror(); | |
| 993 } | |
| 994 klassOop pklass = NULL; | |
| 995 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass); | |
| 996 if (!ss.at_return_type()) { | |
| 997 err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum); | |
| 998 } else { | |
| 999 err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal! | |
| 1000 } | |
| 1001 if (err != NULL) break; | |
| 1002 } | |
| 1003 | |
| 1004 if (err != NULL) { | |
| 1005 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
| 1006 } | |
| 1007 } | |
| 1008 | |
| 1009 // Main routine for verifying the MethodHandle.type of a proposed | |
| 1010 // direct or bound-direct method handle. | |
| 1011 void MethodHandles::verify_method_type(methodHandle m, | |
| 1012 Handle mtype, | |
| 1013 bool has_bound_recv, | |
| 1014 KlassHandle bound_recv_type, | |
| 1015 TRAPS) { | |
| 1016 bool m_needs_receiver = !m->is_static(); | |
| 1017 | |
| 1018 const char* err = NULL; | |
| 1019 | |
| 1020 int first_ptype_pos = m_needs_receiver ? 1 : 0; | |
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1021 if (has_bound_recv) { |
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1022 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them |
| 710 | 1023 if (m_needs_receiver && bound_recv_type.is_null()) |
| 1024 { err = "bound receiver is not an object"; goto die; } | |
| 1025 } | |
| 1026 | |
| 1027 if (m_needs_receiver && err == NULL) { | |
| 1028 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype()); | |
| 1029 if (ptypes->length() < first_ptype_pos) | |
| 1030 { err = "receiver argument is missing"; goto die; } | |
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1031 if (has_bound_recv) |
| 710 | 1032 err = check_method_receiver(m(), bound_recv_type->as_klassOop()); |
| 1033 else | |
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1034 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1))); |
| 710 | 1035 if (err != NULL) goto die; |
| 1036 } | |
| 1037 | |
| 1038 // Check the other arguments for mistypes. | |
| 1039 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK); | |
| 1040 return; | |
| 1041 | |
| 1042 die: | |
| 1043 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
| 1044 } | |
| 1045 | |
| 1046 void MethodHandles::verify_vmslots(Handle mh, TRAPS) { | |
| 1047 // Verify vmslots. | |
| 1048 int check_slots = argument_slot_count(java_dyn_MethodHandle::type(mh())); | |
| 1049 if (java_dyn_MethodHandle::vmslots(mh()) != check_slots) { | |
| 1050 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH"); | |
| 1051 } | |
| 1052 } | |
| 1053 | |
| 1054 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) { | |
| 1055 // Verify that argslot points at the given argnum. | |
| 1056 int check_slot = argument_slot(java_dyn_MethodHandle::type(mh()), argnum); | |
| 1057 if (argslot != check_slot || argslot < 0) { | |
| 1058 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d"; | |
| 1059 size_t msglen = strlen(fmt) + 3*11 + 1; | |
| 1060 char* msg = NEW_RESOURCE_ARRAY(char, msglen); | |
| 1061 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot); | |
| 1062 THROW_MSG(vmSymbols::java_lang_InternalError(), msg); | |
| 1063 } | |
| 1064 } | |
| 1065 | |
| 1066 // Verify the correspondence between two method types. | |
| 1067 // Apart from the advertised changes, caller method type X must | |
| 1068 // be able to invoke the callee method Y type with no violations | |
| 1069 // of type integrity. | |
| 1070 // Return NULL if all is well, else a short error message. | |
| 1071 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end, | |
| 1072 int insert_argnum, oop insert_type, | |
| 1073 int change_argnum, oop change_type, | |
| 1074 int delete_argnum, | |
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1075 oop dst_mtype, int dst_beg, int dst_end, |
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1076 bool raw) { |
| 710 | 1077 objArrayOop src_ptypes = java_dyn_MethodType::ptypes(src_mtype); |
| 1078 objArrayOop dst_ptypes = java_dyn_MethodType::ptypes(dst_mtype); | |
| 1079 | |
| 1080 int src_max = src_ptypes->length(); | |
| 1081 int dst_max = dst_ptypes->length(); | |
| 1082 | |
| 1083 if (src_end == -1) src_end = src_max; | |
| 1084 if (dst_end == -1) dst_end = dst_max; | |
| 1085 | |
| 1086 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob"); | |
| 1087 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob"); | |
| 1088 | |
| 1089 // pending actions; set to -1 when done: | |
| 1090 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum; | |
| 1091 | |
| 1092 const char* err = NULL; | |
| 1093 | |
| 1094 // Walk along each array of parameter types, including a virtual | |
| 1095 // NULL end marker at the end of each. | |
| 1096 for (int src_idx = src_beg, dst_idx = dst_beg; | |
| 1097 (src_idx <= src_end && dst_idx <= dst_end); | |
| 1098 src_idx++, dst_idx++) { | |
| 1099 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx); | |
| 1100 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx); | |
| 1101 bool fix_null_src_type = false; | |
| 1102 | |
| 1103 // Perform requested edits. | |
| 1104 if (ins_idx == src_idx) { | |
| 1105 // note that the inserted guy is never affected by a change or deletion | |
| 1106 ins_idx = -1; | |
| 1107 src_type = insert_type; | |
| 1108 fix_null_src_type = true; | |
| 1109 --src_idx; // back up to process src type on next loop | |
| 1110 src_idx = src_end; | |
| 1111 } else { | |
| 1112 // note that the changed guy can be immediately deleted | |
| 1113 if (chg_idx == src_idx) { | |
| 1114 chg_idx = -1; | |
| 1115 assert(src_idx < src_end, "oob"); | |
| 1116 src_type = change_type; | |
| 1117 fix_null_src_type = true; | |
| 1118 } | |
| 1119 if (del_idx == src_idx) { | |
| 1120 del_idx = -1; | |
| 1121 assert(src_idx < src_end, "oob"); | |
| 1122 --dst_idx; | |
| 1123 continue; // rerun loop after skipping this position | |
| 1124 } | |
| 1125 } | |
| 1126 | |
| 1127 if (src_type == NULL && fix_null_src_type) | |
| 1128 // explicit null in this case matches any dest reference | |
| 1129 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type); | |
| 1130 | |
| 1131 // Compare the two argument types. | |
| 1132 if (src_type != dst_type) { | |
| 1133 if (src_type == NULL) return "not enough arguments"; | |
| 1134 if (dst_type == NULL) return "too many arguments"; | |
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1135 err = check_argument_type_change(src_type, dst_type, dst_idx, raw); |
| 710 | 1136 if (err != NULL) return err; |
| 1137 } | |
| 1138 } | |
| 1139 | |
| 1140 // Now compare return types also. | |
| 1141 oop src_rtype = java_dyn_MethodType::rtype(src_mtype); | |
| 1142 oop dst_rtype = java_dyn_MethodType::rtype(dst_mtype); | |
| 1143 if (src_rtype != dst_rtype) { | |
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1144 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal! |
| 710 | 1145 if (err != NULL) return err; |
| 1146 } | |
| 1147 | |
| 1148 assert(err == NULL, ""); | |
| 1149 return NULL; // all is well | |
| 1150 } | |
| 1151 | |
| 1152 | |
| 1153 const char* MethodHandles::check_argument_type_change(BasicType src_type, | |
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1154 klassOop src_klass, |
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1155 BasicType dst_type, |
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1156 klassOop dst_klass, |
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1157 int argnum, |
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1158 bool raw) { |
| 710 | 1159 const char* err = NULL; |
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1160 bool for_return = (argnum < 0); |
| 710 | 1161 |
| 1162 // just in case: | |
| 1163 if (src_type == T_ARRAY) src_type = T_OBJECT; | |
| 1164 if (dst_type == T_ARRAY) dst_type = T_OBJECT; | |
| 1165 | |
| 1166 // Produce some nice messages if VerifyMethodHandles is turned on: | |
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1167 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) { |
| 710 | 1168 if (src_type == T_OBJECT) { |
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1169 if (raw && dst_type == T_INT && is_always_null_type(src_klass)) |
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1170 return NULL; // OK to convert a null pointer to a garbage int |
| 710 | 1171 err = ((argnum >= 0) |
| 1172 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s" | |
| 1173 : "type mismatch: returning a %s, but caller expects primitive %s"); | |
| 1174 } else if (dst_type == T_OBJECT) { | |
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1175 err = ((argnum >= 0) |
| 710 | 1176 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s" |
| 1177 : "type mismatch: returning a primitive %s, but caller expects %s"); | |
| 1178 } else { | |
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1179 err = ((argnum >= 0) |
| 710 | 1180 ? "type mismatch: passing a %s for method argument #%d, which expects %s" |
| 1181 : "type mismatch: returning a %s, but caller expects %s"); | |
| 1182 } | |
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1183 } else if (src_type == T_OBJECT && dst_type == T_OBJECT && |
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1184 class_cast_needed(src_klass, dst_klass)) { |
| 710 | 1185 if (!class_cast_needed(dst_klass, src_klass)) { |
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1186 if (raw) |
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1187 return NULL; // reverse cast is OK; the MH target is trusted to enforce it |
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1188 err = ((argnum >= 0) |
| 710 | 1189 ? "cast required: passing a %s for method argument #%d, which expects %s" |
| 1190 : "cast required: returning a %s, but caller expects %s"); | |
| 1191 } else { | |
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1192 err = ((argnum >= 0) |
| 710 | 1193 ? "reference mismatch: passing a %s for method argument #%d, which expects %s" |
| 1194 : "reference mismatch: returning a %s, but caller expects %s"); | |
| 1195 } | |
| 1196 } else { | |
| 1197 // passed the obstacle course | |
| 1198 return NULL; | |
| 1199 } | |
| 1200 | |
| 1201 // format, format, format | |
| 1202 const char* src_name = type2name(src_type); | |
| 1203 const char* dst_name = type2name(dst_type); | |
| 1204 if (src_type == T_OBJECT) src_name = Klass::cast(src_klass)->external_name(); | |
| 1205 if (dst_type == T_OBJECT) dst_name = Klass::cast(dst_klass)->external_name(); | |
| 1206 if (src_name == NULL) src_name = "unknown type"; | |
| 1207 if (dst_name == NULL) dst_name = "unknown type"; | |
| 1208 | |
| 1209 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11); | |
| 1210 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1); | |
| 1211 if (argnum >= 0) { | |
| 1212 assert(strstr(err, "%d") != NULL, ""); | |
| 1213 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name); | |
| 1214 } else { | |
| 1215 assert(strstr(err, "%d") == NULL, ""); | |
| 1216 jio_snprintf(msg, msglen, err, src_name, dst_name); | |
| 1217 } | |
| 1218 return msg; | |
| 1219 } | |
| 1220 | |
| 1221 // Compute the depth within the stack of the given argument, i.e., | |
| 1222 // the combined size of arguments to the right of the given argument. | |
| 1223 // For the last argument (ptypes.length-1) this will be zero. | |
| 1224 // For the first argument (0) this will be the size of all | |
| 1225 // arguments but that one. For the special number -1, this | |
| 1226 // will be the size of all arguments, including the first. | |
| 1227 // If the argument is neither -1 nor a valid argument index, | |
| 1228 // then return a negative number. Otherwise, the result | |
| 1229 // is in the range [0..vmslots] inclusive. | |
| 1230 int MethodHandles::argument_slot(oop method_type, int arg) { | |
| 1231 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); | |
| 1232 int argslot = 0; | |
| 1233 int len = ptypes->length(); | |
| 1234 if (arg < -1 || arg >= len) return -99; | |
| 1235 for (int i = len-1; i > arg; i--) { | |
| 1236 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); | |
| 1237 argslot += type2size[bt]; | |
| 1238 } | |
| 1239 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works"); | |
| 1240 return argslot; | |
| 1241 } | |
| 1242 | |
| 1243 // Given a slot number, return the argument number. | |
| 1244 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) { | |
| 1245 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); | |
| 1246 int argslot = 0; | |
| 1247 int len = ptypes->length(); | |
| 1248 for (int i = len-1; i >= 0; i--) { | |
| 1249 if (query_argslot == argslot) return i; | |
| 1250 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); | |
| 1251 argslot += type2size[bt]; | |
| 1252 } | |
| 1253 // return pseudo-arg deepest in stack: | |
| 1254 if (query_argslot == argslot) return -1; | |
| 1255 return -99; // oob slot, or splitting a double-slot arg | |
| 1256 } | |
| 1257 | |
| 1258 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m, | |
| 1259 KlassHandle receiver_limit, | |
| 1260 int decode_flags, | |
| 1261 KlassHandle receiver_klass, | |
| 1262 TRAPS) { | |
| 1263 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference"); | |
| 1264 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument"); | |
| 1265 | |
| 1266 if (!m->is_static() && | |
| 1267 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder()))) | |
| 1268 // given type does not match class of method, or receiver is null! | |
| 1269 // caller should have checked this, but let's be extra careful... | |
| 1270 return methodHandle(); | |
| 1271 | |
| 1272 if (receiver_limit.not_null() && | |
| 1273 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit()))) | |
| 1274 // given type is not limited to the receiver type | |
| 1275 // note that a null receiver can match any reference value, for a static method | |
| 1276 return methodHandle(); | |
| 1277 | |
| 1278 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) { | |
| 1279 // pre-dispatched or static method (null receiver is OK for static) | |
| 1280 return m; | |
| 1281 | |
| 1282 } else if (receiver_klass.is_null()) { | |
| 1283 // null receiver value; cannot dispatch | |
| 1284 return methodHandle(); | |
| 1285 | |
| 1286 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) { | |
| 1287 // perform virtual dispatch | |
| 1288 int vtable_index = m->vtable_index(); | |
| 1289 guarantee(vtable_index >= 0, "valid vtable index"); | |
| 1290 | |
| 1291 // receiver_klass might be an arrayKlassOop but all vtables start at | |
| 1292 // the same place. The cast is to avoid virtual call and assertion. | |
| 1293 // See also LinkResolver::runtime_resolve_virtual_method. | |
| 1294 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass()); | |
| 1295 DEBUG_ONLY(inst->verify_vtable_index(vtable_index)); | |
| 1296 methodOop m_oop = inst->method_at_vtable(vtable_index); | |
| 1297 return methodHandle(THREAD, m_oop); | |
| 1298 | |
| 1299 } else { | |
| 1300 // perform interface dispatch | |
| 1301 int itable_index = klassItable::compute_itable_index(m()); | |
| 1302 guarantee(itable_index >= 0, "valid itable index"); | |
| 1303 instanceKlass* inst = instanceKlass::cast(receiver_klass()); | |
| 1304 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD); | |
| 1305 return methodHandle(THREAD, m_oop); | |
| 1306 } | |
| 1307 } | |
| 1308 | |
| 1309 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) { | |
| 1310 // Verify type. | |
| 1311 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
| 1312 verify_method_type(m, mtype, false, KlassHandle(), CHECK); | |
| 1313 | |
| 1314 // Verify vmslots. | |
| 1315 if (java_dyn_MethodHandle::vmslots(mh()) != m->size_of_parameters()) { | |
| 1316 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH"); | |
| 1317 } | |
| 1318 } | |
| 1319 | |
| 1320 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) { | |
| 1321 // Check arguments. | |
| 1322 if (mh.is_null() || m.is_null() || | |
| 1323 (!do_dispatch && m->is_abstract())) { | |
| 1324 THROW(vmSymbols::java_lang_InternalError()); | |
| 1325 } | |
| 1326 | |
| 1327 java_dyn_MethodHandle::init_vmslots(mh()); | |
| 1328 | |
| 1329 if (VerifyMethodHandles) { | |
| 1330 // The privileged code which invokes this routine should not make | |
| 1331 // a mistake about types, but it's better to verify. | |
| 1332 verify_DirectMethodHandle(mh, m, CHECK); | |
| 1333 } | |
| 1334 | |
| 1335 // Finally, after safety checks are done, link to the target method. | |
| 1336 // We will follow the same path as the latter part of | |
| 1337 // InterpreterRuntime::resolve_invoke(), which first finds the method | |
| 1338 // and then decides how to populate the constant pool cache entry | |
| 1339 // that links the interpreter calls to the method. We need the same | |
| 1340 // bits, and will use the same calling sequence code. | |
| 1341 | |
| 1342 int vmindex = methodOopDesc::garbage_vtable_index; | |
| 1343 oop vmtarget = NULL; | |
| 1344 | |
| 1345 instanceKlass::cast(m->method_holder())->link_class(CHECK); | |
| 1346 | |
| 1347 MethodHandleEntry* me = NULL; | |
| 1348 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) { | |
| 1349 // We are simulating an invokeinterface instruction. | |
| 1350 // (We might also be simulating an invokevirtual on a miranda method, | |
| 1351 // but it is safe to treat it as an invokeinterface.) | |
| 1352 assert(!m->can_be_statically_bound(), "no final methods on interfaces"); | |
| 1353 vmindex = klassItable::compute_itable_index(m()); | |
| 1354 assert(vmindex >= 0, "(>=0) == do_dispatch"); | |
| 1355 // Set up same bits as ConstantPoolCacheEntry::set_interface_call(). | |
| 1356 vmtarget = m->method_holder(); // the interface | |
| 1357 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh); | |
| 1358 } else if (!do_dispatch || m->can_be_statically_bound()) { | |
| 1359 // We are simulating an invokestatic or invokespecial instruction. | |
| 1360 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method(). | |
| 1361 vmtarget = m(); | |
| 1362 // this does not help dispatch, but it will make it possible to parse this MH: | |
| 1363 vmindex = methodOopDesc::nonvirtual_vtable_index; | |
| 1364 assert(vmindex < 0, "(>=0) == do_dispatch"); | |
| 1365 if (!m->is_static()) { | |
| 1366 me = MethodHandles::entry(MethodHandles::_invokespecial_mh); | |
| 1367 } else { | |
| 1368 me = MethodHandles::entry(MethodHandles::_invokestatic_mh); | |
| 1369 // Part of the semantics of a static call is an initialization barrier. | |
| 1370 // For a DMH, it is done now, when the handle is created. | |
| 1371 Klass* k = Klass::cast(m->method_holder()); | |
| 1372 if (k->should_be_initialized()) { | |
| 1373 k->initialize(CHECK); | |
| 1374 } | |
| 1375 } | |
| 1376 } else { | |
| 1377 // We are simulating an invokevirtual instruction. | |
| 1378 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method(). | |
| 1379 // The key logic is LinkResolver::runtime_resolve_virtual_method. | |
| 1380 vmindex = m->vtable_index(); | |
| 1381 vmtarget = m->method_holder(); | |
| 1382 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh); | |
| 1383 } | |
| 1384 | |
| 1385 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
| 1386 | |
| 1387 sun_dyn_DirectMethodHandle::set_vmtarget(mh(), vmtarget); | |
| 1388 sun_dyn_DirectMethodHandle::set_vmindex(mh(), vmindex); | |
| 1389 DEBUG_ONLY(int flags; klassOop rlimit); | |
| 1390 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(), | |
| 1391 "properly stored for later decoding"); | |
| 1392 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0)); | |
| 1393 assert(!(actual_do_dispatch && !do_dispatch), | |
| 1394 "do not perform dispatch if !do_dispatch specified"); | |
| 1395 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch"); | |
| 1396 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack"); | |
| 1397 | |
| 1398 // Done! | |
| 1399 java_dyn_MethodHandle::set_vmentry(mh(), me); | |
| 1400 } | |
| 1401 | |
| 1402 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh, | |
| 1403 methodHandle m, | |
| 1404 TRAPS) { | |
| 1405 // Verify type. | |
| 1406 oop receiver = sun_dyn_BoundMethodHandle::argument(mh()); | |
| 1407 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
| 1408 KlassHandle bound_recv_type; | |
| 1409 if (receiver != NULL) bound_recv_type = KlassHandle(THREAD, receiver->klass()); | |
| 1410 verify_method_type(m, mtype, true, bound_recv_type, CHECK); | |
| 1411 | |
| 1412 int receiver_pos = m->size_of_parameters() - 1; | |
| 1413 | |
| 1414 // Verify MH.vmargslot, which should point at the bound receiver. | |
| 1415 verify_vmargslot(mh, -1, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); | |
| 1416 //verify_vmslots(mh, CHECK); | |
| 1417 | |
| 1418 // Verify vmslots. | |
| 1419 if (java_dyn_MethodHandle::vmslots(mh()) != receiver_pos) { | |
| 1420 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)"); | |
| 1421 } | |
| 1422 } | |
| 1423 | |
| 1424 // Initialize a BMH with a receiver bound directly to a methodOop. | |
| 1425 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh, | |
| 1426 methodHandle original_m, | |
| 1427 KlassHandle receiver_limit, | |
| 1428 int decode_flags, | |
| 1429 TRAPS) { | |
| 1430 // Check arguments. | |
| 1431 if (mh.is_null() || original_m.is_null()) { | |
| 1432 THROW(vmSymbols::java_lang_InternalError()); | |
| 1433 } | |
| 1434 | |
| 1435 KlassHandle receiver_klass; | |
| 1436 { | |
| 1437 oop receiver_oop = sun_dyn_BoundMethodHandle::argument(mh()); | |
| 1438 if (receiver_oop != NULL) | |
| 1439 receiver_klass = KlassHandle(THREAD, receiver_oop->klass()); | |
| 1440 } | |
| 1441 methodHandle m = dispatch_decoded_method(original_m, | |
| 1442 receiver_limit, decode_flags, | |
| 1443 receiver_klass, | |
| 1444 CHECK); | |
| 1445 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); } | |
| 1446 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); } | |
| 1447 | |
| 1448 java_dyn_MethodHandle::init_vmslots(mh()); | |
| 1449 | |
| 1450 if (VerifyMethodHandles) { | |
| 1451 verify_BoundMethodHandle_with_receiver(mh, m, CHECK); | |
| 1452 } | |
| 1453 | |
| 1454 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); | |
| 1455 | |
| 1456 DEBUG_ONLY(int junk; klassOop junk2); | |
| 1457 assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding"); | |
| 1458 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot"); | |
| 1459 | |
| 1460 // Done! | |
| 1461 java_dyn_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh)); | |
| 1462 } | |
| 1463 | |
| 1464 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum, | |
| 1465 bool direct_to_method, TRAPS) { | |
| 1466 Handle ptype_handle(THREAD, | |
| 1467 java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum)); | |
| 1468 KlassHandle ptype_klass; | |
| 1469 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass); | |
| 1470 int slots_pushed = type2size[ptype]; | |
| 1471 | |
| 1472 oop argument = sun_dyn_BoundMethodHandle::argument(mh()); | |
| 1473 | |
| 1474 const char* err = NULL; | |
| 1475 | |
| 1476 switch (ptype) { | |
| 1477 case T_OBJECT: | |
| 1478 if (argument != NULL) | |
| 1479 // we must implicitly convert from the arg type to the outgoing ptype | |
| 1480 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum); | |
| 1481 break; | |
| 1482 | |
| 1483 case T_ARRAY: case T_VOID: | |
| 1484 assert(false, "array, void do not appear here"); | |
| 1485 default: | |
| 1486 if (ptype != T_INT && !is_subword_type(ptype)) { | |
| 1487 err = "unexpected parameter type"; | |
| 1488 break; | |
| 1489 } | |
| 1490 // check subrange of Integer.value, if necessary | |
| 1142 | 1491 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) { |
| 710 | 1492 err = "bound integer argument must be of type java.lang.Integer"; |
| 1493 break; | |
| 1494 } | |
| 1495 if (ptype != T_INT) { | |
| 1496 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT); | |
| 1497 jint value = argument->int_field(value_offset); | |
| 1498 int vminfo = adapter_subword_vminfo(ptype); | |
| 1499 jint subword = truncate_subword_from_vminfo(value, vminfo); | |
| 1500 if (value != subword) { | |
| 1501 err = "bound subword value does not fit into the subword type"; | |
| 1502 break; | |
| 1503 } | |
| 1504 } | |
| 1505 break; | |
| 1506 case T_FLOAT: | |
| 1507 case T_DOUBLE: | |
| 1508 case T_LONG: | |
| 1509 { | |
| 1510 // we must implicitly convert from the unboxed arg type to the outgoing ptype | |
| 1511 BasicType argbox = java_lang_boxing_object::basic_type(argument); | |
| 1512 if (argbox != ptype) { | |
| 1513 err = check_argument_type_change(T_OBJECT, (argument == NULL | |
| 1142 | 1514 ? SystemDictionary::Object_klass() |
| 710 | 1515 : argument->klass()), |
| 1516 ptype, ptype_klass(), argnum); | |
| 1517 assert(err != NULL, "this must be an error"); | |
| 1518 } | |
| 1519 break; | |
| 1520 } | |
| 1521 } | |
| 1522 | |
| 1523 if (err == NULL) { | |
| 1524 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); | |
| 1525 if (direct_to_method) { | |
| 1526 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots"); | |
| 1527 assert(slots_pushed <= MethodHandlePushLimit, ""); | |
| 1528 } else { | |
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1529 int target_pushes = decode_MethodHandle_stack_pushes(target()); |
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1530 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct"); |
| 710 | 1531 // do not blow the stack; use a Java-based adapter if this limit is exceeded |
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1532 // FIXME |
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1533 // if (slots_pushed + target_pushes > MethodHandlePushLimit) |
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1534 // err = "too many bound parameters"; |
| 710 | 1535 } |
| 1536 } | |
| 1537 | |
| 1538 if (err == NULL) { | |
| 1539 // Verify the rest of the method type. | |
| 1540 err = check_method_type_insertion(java_dyn_MethodHandle::type(mh()), | |
| 1541 argnum, ptype_handle(), | |
| 1542 java_dyn_MethodHandle::type(target())); | |
| 1543 } | |
| 1544 | |
| 1545 if (err != NULL) { | |
| 1546 THROW_MSG(vmSymbols::java_lang_InternalError(), err); | |
| 1547 } | |
| 1548 } | |
| 1549 | |
| 1550 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { | |
| 1551 // Check arguments. | |
| 1552 if (mh.is_null() || target.is_null() || !java_dyn_MethodHandle::is_instance(target())) { | |
| 1553 THROW(vmSymbols::java_lang_InternalError()); | |
| 1554 } | |
| 1555 | |
| 1556 java_dyn_MethodHandle::init_vmslots(mh()); | |
| 1557 | |
| 1558 if (VerifyMethodHandles) { | |
| 1559 int insert_after = argnum - 1; | |
| 1560 verify_vmargslot(mh, insert_after, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); | |
| 1561 verify_vmslots(mh, CHECK); | |
| 1562 } | |
| 1563 | |
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1564 // Get bound type and required slots. |
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1565 oop ptype_oop = java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum); |
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1566 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop); |
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1567 int slots_pushed = type2size[ptype]; |
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1568 |
| 710 | 1569 // If (a) the target is a direct non-dispatched method handle, |
| 1570 // or (b) the target is a dispatched direct method handle and we | |
| 1571 // are binding the receiver, cut out the middle-man. | |
| 1572 // Do this by decoding the DMH and using its methodOop directly as vmtarget. | |
| 1573 bool direct_to_method = false; | |
| 1574 if (OptimizeMethodHandles && | |
| 1575 target->klass() == SystemDictionary::DirectMethodHandle_klass() && | |
| 1576 (argnum == 0 || sun_dyn_DirectMethodHandle::vmindex(target()) < 0)) { | |
| 1577 int decode_flags = 0; klassOop receiver_limit_oop = NULL; | |
| 1578 methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags)); | |
| 1579 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); } | |
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1580 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg. |
| 710 | 1581 assert(sun_dyn_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig"); |
| 1582 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) { | |
| 1583 KlassHandle receiver_limit(THREAD, receiver_limit_oop); | |
| 1584 init_BoundMethodHandle_with_receiver(mh, m, | |
| 1585 receiver_limit, decode_flags, | |
| 1586 CHECK); | |
| 1587 return; | |
| 1588 } | |
| 1589 | |
| 1590 // Even if it is not a bound receiver, we still might be able | |
| 1591 // to bind another argument and still invoke the methodOop directly. | |
| 1592 if (!(decode_flags & _dmf_does_dispatch)) { | |
| 1593 direct_to_method = true; | |
| 1594 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); | |
| 1595 } | |
| 1596 } | |
| 1597 if (!direct_to_method) | |
| 1598 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), target()); | |
| 1599 | |
| 1600 if (VerifyMethodHandles) { | |
| 1601 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK); | |
| 1602 } | |
| 1603 | |
| 1604 // Next question: Is this a ref, int, or long bound value? | |
| 1605 MethodHandleEntry* me = NULL; | |
| 1606 if (ptype == T_OBJECT) { | |
| 1607 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh); | |
| 1608 else me = MethodHandles::entry(_bound_ref_mh); | |
| 1609 } else if (slots_pushed == 2) { | |
| 1610 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh); | |
| 1611 else me = MethodHandles::entry(_bound_long_mh); | |
| 1612 } else if (slots_pushed == 1) { | |
| 1613 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh); | |
| 1614 else me = MethodHandles::entry(_bound_int_mh); | |
| 1615 } else { | |
| 1616 assert(false, ""); | |
| 1617 } | |
| 1618 | |
| 1619 // Done! | |
| 1620 java_dyn_MethodHandle::set_vmentry(mh(), me); | |
| 1621 } | |
| 1622 | |
| 1623 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) { | |
| 1624 char msg[200]; | |
| 1625 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err); | |
| 1626 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg); | |
| 1627 } | |
| 1628 | |
| 1629 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) { | |
| 1630 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); | |
| 1631 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); | |
| 1632 | |
| 1633 verify_vmargslot(mh, argnum, argslot, CHECK); | |
| 1634 verify_vmslots(mh, CHECK); | |
| 1635 | |
| 1636 jint conv_op = adapter_conversion_op(conversion); | |
| 1637 if (!conv_op_valid(conv_op)) { | |
| 1638 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD); | |
| 1639 return; | |
| 1640 } | |
| 1641 EntryKind ek = adapter_entry_kind(conv_op); | |
| 1642 | |
| 1643 int stack_move = adapter_conversion_stack_move(conversion); | |
| 1644 BasicType src = adapter_conversion_src_type(conversion); | |
| 1645 BasicType dest = adapter_conversion_dest_type(conversion); | |
| 1646 int vminfo = adapter_conversion_vminfo(conversion); // should be zero | |
| 1647 | |
| 1648 Handle argument(THREAD, sun_dyn_AdapterMethodHandle::argument(mh())); | |
| 1649 Handle target(THREAD, sun_dyn_AdapterMethodHandle::vmtarget(mh())); | |
| 1650 Handle src_mtype(THREAD, java_dyn_MethodHandle::type(mh())); | |
| 1651 Handle dst_mtype(THREAD, java_dyn_MethodHandle::type(target())); | |
| 1652 | |
| 1653 const char* err = NULL; | |
| 1654 | |
| 1655 if (err == NULL) { | |
| 1656 // Check that the correct argument is supplied, but only if it is required. | |
| 1657 switch (ek) { | |
| 1658 case _adapter_check_cast: // target type of cast | |
| 1659 case _adapter_ref_to_prim: // wrapper type from which to unbox | |
| 1660 case _adapter_prim_to_ref: // wrapper type to box into | |
| 1661 case _adapter_collect_args: // array type to collect into | |
| 1662 case _adapter_spread_args: // array type to spread from | |
| 1663 if (!java_lang_Class::is_instance(argument()) | |
| 1664 || java_lang_Class::is_primitive(argument())) | |
| 1665 { err = "adapter requires argument of type java.lang.Class"; break; } | |
| 1666 if (ek == _adapter_collect_args || | |
| 1667 ek == _adapter_spread_args) { | |
| 1668 // Make sure it is a suitable collection type. (Array, for now.) | |
| 1669 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument())); | |
| 1670 if (!ak->oop_is_objArray()) { | |
| 1671 { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; } | |
| 1672 } | |
| 1673 } | |
| 1674 break; | |
| 1675 case _adapter_flyby: | |
| 1676 case _adapter_ricochet: | |
| 1677 if (!java_dyn_MethodHandle::is_instance(argument())) | |
| 1678 { err = "MethodHandle adapter argument required"; break; } | |
| 1679 break; | |
| 1680 default: | |
| 1681 if (argument.not_null()) | |
| 1682 { err = "adapter has spurious argument"; break; } | |
| 1683 break; | |
| 1684 } | |
| 1685 } | |
| 1686 | |
| 1687 if (err == NULL) { | |
| 1688 // Check that the src/dest types are supplied if needed. | |
| 1689 switch (ek) { | |
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1690 case _adapter_check_cast: |
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1691 if (src != T_OBJECT || dest != T_OBJECT) { |
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1692 err = "adapter requires object src/dest conversion subfields"; |
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1693 } |
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1694 break; |
| 710 | 1695 case _adapter_prim_to_prim: |
| 1696 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) { | |
| 1697 err = "adapter requires primitive src/dest conversion subfields"; break; | |
| 1698 } | |
| 1699 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) || | |
| 1700 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) { | |
| 1701 err = "adapter cannot convert beween floating and fixed-point"; break; | |
| 1702 } | |
| 1703 break; | |
| 1704 case _adapter_ref_to_prim: | |
| 1705 if (src != T_OBJECT || !is_java_primitive(dest) | |
| 1706 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) { | |
| 1707 err = "adapter requires primitive dest conversion subfield"; break; | |
| 1708 } | |
| 1709 break; | |
| 1710 case _adapter_prim_to_ref: | |
| 1711 if (!is_java_primitive(src) || dest != T_OBJECT | |
| 1712 || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) { | |
| 1713 err = "adapter requires primitive src conversion subfield"; break; | |
| 1714 } | |
| 1715 break; | |
| 1716 case _adapter_swap_args: | |
| 1717 case _adapter_rot_args: | |
| 1718 { | |
| 1719 if (!src || src != dest) { | |
| 1720 err = "adapter requires src/dest conversion subfields for swap"; break; | |
| 1721 } | |
| 1722 int swap_size = type2size[src]; | |
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1723 oop src_mtype = sun_dyn_AdapterMethodHandle::type(mh()); |
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1724 oop dest_mtype = sun_dyn_AdapterMethodHandle::type(target()); |
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1725 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(target()); |
| 710 | 1726 int src_slot = argslot; |
| 1727 int dest_slot = vminfo; | |
| 1728 bool rotate_up = (src_slot > dest_slot); // upward rotation | |
| 1729 int src_arg = argnum; | |
| 1730 int dest_arg = argument_slot_to_argnum(dest_mtype, dest_slot); | |
| 1731 verify_vmargslot(mh, dest_arg, dest_slot, CHECK); | |
| 1732 if (!(dest_slot >= src_slot + swap_size) && | |
| 1733 !(src_slot >= dest_slot + swap_size)) { | |
| 1734 err = "source, destination slots must be distinct"; | |
| 1735 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) { | |
| 1736 err = "source of swap must be deeper in stack"; | |
| 1737 } else if (ek == _adapter_swap_args) { | |
| 1738 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, dest_arg), | |
| 1739 java_dyn_MethodType::ptype(dest_mtype, src_arg), | |
| 1740 dest_arg); | |
| 1741 } else if (ek == _adapter_rot_args) { | |
| 1742 if (rotate_up) { | |
| 1743 assert((src_slot > dest_slot) && (src_arg < dest_arg), ""); | |
| 1744 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot] | |
| 1745 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1] | |
| 1746 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) { | |
| 1747 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), | |
| 1748 java_dyn_MethodType::ptype(dest_mtype, i-1), | |
| 1749 i); | |
| 1750 } | |
| 1751 } else { // rotate down | |
| 1752 assert((src_slot < dest_slot) && (src_arg > dest_arg), ""); | |
| 1753 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss] | |
| 1754 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg] | |
| 1755 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) { | |
| 1756 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), | |
| 1757 java_dyn_MethodType::ptype(dest_mtype, i+1), | |
| 1758 i); | |
| 1759 } | |
| 1760 } | |
| 1761 } | |
| 1762 if (err == NULL) | |
| 1763 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, src_arg), | |
| 1764 java_dyn_MethodType::ptype(dest_mtype, dest_arg), | |
| 1765 src_arg); | |
| 1766 } | |
| 1767 break; | |
| 1768 case _adapter_collect_args: | |
| 1769 case _adapter_spread_args: | |
| 1770 { | |
| 1771 BasicType coll_type = (ek == _adapter_collect_args) ? dest : src; | |
| 1772 BasicType elem_type = (ek == _adapter_collect_args) ? src : dest; | |
| 1773 if (coll_type != T_OBJECT || elem_type != T_OBJECT) { | |
| 1774 err = "adapter requires src/dest subfields"; break; | |
| 1775 // later: | |
| 1776 // - consider making coll be a primitive array | |
| 1777 // - consider making coll be a heterogeneous collection | |
| 1778 } | |
| 1779 } | |
| 1780 break; | |
| 1781 default: | |
| 1782 if (src != 0 || dest != 0) { | |
| 1783 err = "adapter has spurious src/dest conversion subfields"; break; | |
| 1784 } | |
| 1785 break; | |
| 1786 } | |
| 1787 } | |
| 1788 | |
| 1789 if (err == NULL) { | |
| 1790 // Check the stack_move subfield. | |
| 1791 // It must always report the net change in stack size, positive or negative. | |
| 1792 int slots_pushed = stack_move / stack_move_unit(); | |
| 1793 switch (ek) { | |
| 1794 case _adapter_prim_to_prim: | |
| 1795 case _adapter_ref_to_prim: | |
| 1796 case _adapter_prim_to_ref: | |
| 1797 if (slots_pushed != type2size[dest] - type2size[src]) { | |
| 1798 err = "wrong stack motion for primitive conversion"; | |
| 1799 } | |
| 1800 break; | |
| 1801 case _adapter_dup_args: | |
| 1802 if (slots_pushed <= 0) { | |
| 1803 err = "adapter requires conversion subfield slots_pushed > 0"; | |
| 1804 } | |
| 1805 break; | |
| 1806 case _adapter_drop_args: | |
| 1807 if (slots_pushed >= 0) { | |
| 1808 err = "adapter requires conversion subfield slots_pushed < 0"; | |
| 1809 } | |
| 1810 break; | |
| 1811 case _adapter_collect_args: | |
| 1812 if (slots_pushed > 1) { | |
| 1813 err = "adapter requires conversion subfield slots_pushed <= 1"; | |
| 1814 } | |
| 1815 break; | |
| 1816 case _adapter_spread_args: | |
| 1817 if (slots_pushed < -1) { | |
| 1818 err = "adapter requires conversion subfield slots_pushed >= -1"; | |
| 1819 } | |
| 1820 break; | |
| 1821 default: | |
| 1822 if (stack_move != 0) { | |
| 1823 err = "adapter has spurious stack_move conversion subfield"; | |
| 1824 } | |
| 1825 break; | |
| 1826 } | |
| 1827 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) { | |
| 1828 err = "stack_move conversion subfield must be multiple of stack_move_unit"; | |
| 1829 } | |
| 1830 } | |
| 1831 | |
| 1832 if (err == NULL) { | |
| 1833 // Make sure this adapter does not push too deeply. | |
| 1834 int slots_pushed = stack_move / stack_move_unit(); | |
| 1835 int this_vmslots = java_dyn_MethodHandle::vmslots(mh()); | |
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1836 int target_vmslots = java_dyn_MethodHandle::vmslots(target()); |
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1837 if (slots_pushed != (target_vmslots - this_vmslots)) { |
| 710 | 1838 err = "stack_move inconsistent with previous and current MethodType vmslots"; |
| 1839 } else if (slots_pushed > 0) { | |
| 1840 // verify stack_move against MethodHandlePushLimit | |
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1841 int target_pushes = decode_MethodHandle_stack_pushes(target()); |
| 710 | 1842 // do not blow the stack; use a Java-based adapter if this limit is exceeded |
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1843 if (slots_pushed + target_pushes > MethodHandlePushLimit) { |
| 710 | 1844 err = "adapter pushes too many parameters"; |
| 1845 } | |
| 1846 } | |
| 1847 | |
| 1848 // While we're at it, check that the stack motion decoder works: | |
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1849 DEBUG_ONLY(int target_pushes = decode_MethodHandle_stack_pushes(target())); |
| 710 | 1850 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); |
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1851 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct"); |
| 710 | 1852 } |
| 1853 | |
| 1854 if (err == NULL && vminfo != 0) { | |
| 1855 switch (ek) { | |
| 1856 case _adapter_swap_args: | |
| 1857 case _adapter_rot_args: | |
| 1858 break; // OK | |
| 1859 default: | |
| 1860 err = "vminfo subfield is reserved to the JVM"; | |
| 1861 } | |
| 1862 } | |
| 1863 | |
| 1864 // Do additional ad hoc checks. | |
| 1865 if (err == NULL) { | |
| 1866 switch (ek) { | |
| 1867 case _adapter_retype_only: | |
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1868 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false); |
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1869 break; |
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1870 |
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1871 case _adapter_retype_raw: |
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1872 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true); |
| 710 | 1873 break; |
| 1874 | |
| 1875 case _adapter_check_cast: | |
| 1876 { | |
| 1877 // The actual value being checked must be a reference: | |
| 1878 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype(), argnum), | |
| 1879 object_java_mirror(), argnum); | |
| 1880 if (err != NULL) break; | |
| 1881 | |
| 1882 // The output of the cast must fit with the destination argument: | |
| 1883 Handle cast_class = argument; | |
| 1884 err = check_method_type_conversion(src_mtype(), | |
| 1885 argnum, cast_class(), | |
| 1886 dst_mtype()); | |
| 1887 } | |
| 1888 break; | |
| 1889 | |
| 1890 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles | |
| 1891 } | |
| 1892 } | |
| 1893 | |
| 1894 if (err != NULL) { | |
| 1895 throw_InternalError_for_bad_conversion(conversion, err, THREAD); | |
| 1896 return; | |
| 1897 } | |
| 1898 | |
| 1899 } | |
| 1900 | |
| 1901 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { | |
| 1902 oop argument = sun_dyn_AdapterMethodHandle::argument(mh()); | |
| 1903 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); | |
| 1904 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); | |
| 1905 jint conv_op = adapter_conversion_op(conversion); | |
| 1906 | |
| 1907 // adjust the adapter code to the internal EntryKind enumeration: | |
| 1908 EntryKind ek_orig = adapter_entry_kind(conv_op); | |
| 1909 EntryKind ek_opt = ek_orig; // may be optimized | |
| 1910 | |
| 1911 // Finalize the vmtarget field (Java initialized it to null). | |
| 1912 if (!java_dyn_MethodHandle::is_instance(target())) { | |
| 1913 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD); | |
| 1914 return; | |
| 1915 } | |
| 1916 sun_dyn_AdapterMethodHandle::set_vmtarget(mh(), target()); | |
| 1917 | |
| 1918 if (VerifyMethodHandles) { | |
| 1919 verify_AdapterMethodHandle(mh, argnum, CHECK); | |
| 1920 } | |
| 1921 | |
| 1922 int stack_move = adapter_conversion_stack_move(conversion); | |
| 1923 BasicType src = adapter_conversion_src_type(conversion); | |
| 1924 BasicType dest = adapter_conversion_dest_type(conversion); | |
| 1925 int vminfo = adapter_conversion_vminfo(conversion); // should be zero | |
| 1926 | |
| 1927 const char* err = NULL; | |
| 1928 | |
| 1929 // Now it's time to finish the case analysis and pick a MethodHandleEntry. | |
| 1930 switch (ek_orig) { | |
| 1931 case _adapter_retype_only: | |
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1932 case _adapter_retype_raw: |
| 710 | 1933 case _adapter_check_cast: |
| 1934 case _adapter_dup_args: | |
| 1935 case _adapter_drop_args: | |
| 1936 // these work fine via general case code | |
| 1937 break; | |
| 1938 | |
| 1939 case _adapter_prim_to_prim: | |
| 1940 { | |
| 1941 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}. | |
| 1942 // And, the {float,double} -> {int,long} cases must be handled by Java. | |
| 1943 switch (type2size[src] *4+ type2size[dest]) { | |
| 1944 case 1 *4+ 1: | |
| 1945 assert(src == T_INT || is_subword_type(src), "source is not float"); | |
| 1946 // Subword-related cases are int -> {boolean,byte,char,short}. | |
| 1947 ek_opt = _adapter_opt_i2i; | |
| 1948 vminfo = adapter_subword_vminfo(dest); | |
| 1949 break; | |
| 1950 case 2 *4+ 1: | |
| 1951 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) { | |
| 1952 ek_opt = _adapter_opt_l2i; | |
| 1953 vminfo = adapter_subword_vminfo(dest); | |
| 1954 } else if (src == T_DOUBLE && dest == T_FLOAT) { | |
| 1955 ek_opt = _adapter_opt_d2f; | |
| 1956 } else { | |
| 1957 assert(false, ""); | |
| 1958 } | |
| 1959 break; | |
| 1960 case 1 *4+ 2: | |
| 1961 if (src == T_INT && dest == T_LONG) { | |
| 1962 ek_opt = _adapter_opt_i2l; | |
| 1963 } else if (src == T_FLOAT && dest == T_DOUBLE) { | |
| 1964 ek_opt = _adapter_opt_f2d; | |
| 1965 } else { | |
| 1966 assert(false, ""); | |
| 1967 } | |
| 1968 break; | |
| 1969 default: | |
| 1970 assert(false, ""); | |
| 1971 break; | |
| 1972 } | |
| 1973 } | |
| 1974 break; | |
| 1975 | |
| 1976 case _adapter_ref_to_prim: | |
| 1977 { | |
| 1978 switch (type2size[dest]) { | |
| 1979 case 1: | |
| 1980 ek_opt = _adapter_opt_unboxi; | |
| 1981 vminfo = adapter_subword_vminfo(dest); | |
| 1982 break; | |
| 1983 case 2: | |
| 1984 ek_opt = _adapter_opt_unboxl; | |
| 1985 break; | |
| 1986 default: | |
| 1987 assert(false, ""); | |
| 1988 break; | |
| 1989 } | |
| 1990 } | |
| 1991 break; | |
| 1992 | |
| 1993 case _adapter_prim_to_ref: | |
| 1994 goto throw_not_impl; // allocates, hence could block | |
| 1995 | |
| 1996 case _adapter_swap_args: | |
| 1997 case _adapter_rot_args: | |
| 1998 { | |
| 1999 int swap_slots = type2size[src]; | |
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2000 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(mh()); |
| 710 | 2001 int src_slot = argslot; |
| 2002 int dest_slot = vminfo; | |
| 2003 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1; | |
| 2004 switch (swap_slots) { | |
| 2005 case 1: | |
| 2006 ek_opt = (!rotate ? _adapter_opt_swap_1 : | |
| 2007 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down); | |
| 2008 break; | |
| 2009 case 2: | |
| 2010 ek_opt = (!rotate ? _adapter_opt_swap_2 : | |
| 2011 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down); | |
| 2012 break; | |
| 2013 default: | |
| 2014 assert(false, ""); | |
| 2015 break; | |
| 2016 } | |
| 2017 } | |
| 2018 break; | |
| 2019 | |
| 2020 case _adapter_collect_args: | |
| 2021 goto throw_not_impl; // allocates, hence could block | |
| 2022 | |
| 2023 case _adapter_spread_args: | |
| 2024 { | |
| 2025 // vminfo will be the required length of the array | |
| 2026 int slots_pushed = stack_move / stack_move_unit(); | |
| 2027 int array_size = slots_pushed + 1; | |
| 2028 assert(array_size >= 0, ""); | |
| 2029 vminfo = array_size; | |
| 2030 switch (array_size) { | |
| 2031 case 0: ek_opt = _adapter_opt_spread_0; break; | |
| 2032 case 1: ek_opt = _adapter_opt_spread_1; break; | |
| 2033 default: ek_opt = _adapter_opt_spread_more; break; | |
| 2034 } | |
| 2035 if ((vminfo & CONV_VMINFO_MASK) != vminfo) | |
| 2036 goto throw_not_impl; // overflow | |
| 2037 } | |
| 2038 break; | |
| 2039 | |
| 2040 case _adapter_flyby: | |
| 2041 case _adapter_ricochet: | |
| 2042 goto throw_not_impl; // runs Java code, hence could block | |
| 2043 | |
| 2044 default: | |
| 2045 // should have failed much earlier; must be a missing case here | |
| 2046 assert(false, "incomplete switch"); | |
| 2047 // and fall through: | |
| 2048 | |
| 2049 throw_not_impl: | |
| 2050 // FIXME: these adapters are NYI | |
| 2051 err = "adapter not yet implemented in the JVM"; | |
| 2052 break; | |
| 2053 } | |
| 2054 | |
| 2055 if (err != NULL) { | |
| 2056 throw_InternalError_for_bad_conversion(conversion, err, THREAD); | |
| 2057 return; | |
| 2058 } | |
| 2059 | |
| 2060 // Rebuild the conversion value; maybe parts of it were changed. | |
| 2061 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo); | |
| 2062 | |
| 2063 // Finalize the conversion field. (Note that it is final to Java code.) | |
| 2064 sun_dyn_AdapterMethodHandle::set_conversion(mh(), new_conversion); | |
| 2065 | |
| 2066 // Done! | |
| 2067 java_dyn_MethodHandle::set_vmentry(mh(), entry(ek_opt)); | |
| 2068 | |
| 2069 // There should be enough memory barriers on exit from native methods | |
| 2070 // to ensure that the MH is fully initialized to all threads before | |
| 2071 // Java code can publish it in global data structures. | |
| 2072 } | |
| 2073 | |
| 2074 // | |
| 2075 // Here are the native methods on sun.dyn.MethodHandleImpl. | |
| 2076 // They are the private interface between this JVM and the HotSpot-specific | |
| 2077 // Java code that implements JSR 292 method handles. | |
| 2078 // | |
| 2079 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way | |
| 2080 // that intrinsic (non-JNI) native methods are defined in HotSpot. | |
| 2081 // | |
| 2082 | |
| 2083 // direct method handles for invokestatic or invokespecial | |
| 2084 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller); | |
| 2085 JVM_ENTRY(void, MHI_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
| 2086 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) { | |
| 2087 ResourceMark rm; // for error messages | |
| 2088 | |
| 2089 // This is the guy we are initializing: | |
| 2090 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
| 2091 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
| 2092 | |
| 2093 // Early returns out of this method leave the DMH in an unfinished state. | |
| 2094 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
| 2095 | |
| 2096 // which method are we really talking about? | |
| 2097 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
| 2098 oop target_oop = JNIHandles::resolve_non_null(target_jh); | |
| 2099 if (sun_dyn_MemberName::is_instance(target_oop) && | |
| 2100 sun_dyn_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) { | |
| 2101 Handle mname(THREAD, target_oop); | |
| 2102 MethodHandles::resolve_MemberName(mname, CHECK); | |
| 2103 target_oop = mname(); // in case of GC | |
| 2104 } | |
| 2105 | |
| 2106 int decode_flags = 0; klassOop receiver_limit = NULL; | |
| 2107 methodHandle m(THREAD, | |
| 2108 MethodHandles::decode_method(target_oop, | |
| 2109 receiver_limit, decode_flags)); | |
| 2110 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); } | |
| 2111 | |
| 2112 // The trusted Java code that calls this method should already have performed | |
| 2113 // access checks on behalf of the given caller. But, we can verify this. | |
| 2114 if (VerifyMethodHandles && caller_jh != NULL) { | |
| 2115 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh))); | |
| 2116 // If this were a bytecode, the first access check would be against | |
| 2117 // the "reference class" mentioned in the CONSTANT_Methodref. | |
| 2118 // For that class, we use the defining class of m, | |
| 2119 // or a more specific receiver limit if available. | |
| 2120 klassOop reference_klass = m->method_holder(); // OK approximation | |
| 2121 if (receiver_limit != NULL && receiver_limit != reference_klass) { | |
| 2122 if (!Klass::cast(receiver_limit)->is_subtype_of(reference_klass)) | |
| 2123 THROW_MSG(vmSymbols::java_lang_InternalError(), "receiver limit out of bounds"); // Java code bug | |
| 2124 reference_klass = receiver_limit; | |
| 2125 } | |
| 2126 // Emulate LinkResolver::check_klass_accessability. | |
| 2127 if (!Reflection::verify_class_access(caller->as_klassOop(), | |
| 2128 reference_klass, | |
| 2129 true)) { | |
| 2130 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(m->method_holder())->external_name()); | |
| 2131 } | |
| 2132 // If there were a bytecode, the next step would be to lookup the method | |
| 2133 // in the reference class, then then check the method's access bits. | |
| 2134 // Emulate LinkResolver::check_method_accessability. | |
| 2135 klassOop resolved_klass = m->method_holder(); | |
| 2136 if (!Reflection::verify_field_access(caller->as_klassOop(), | |
| 2137 resolved_klass, reference_klass, | |
| 2138 m->access_flags(), | |
| 2139 true)) { | |
| 2140 // %%% following cutout belongs in Reflection::verify_field_access? | |
| 2141 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(), | |
| 2142 reference_klass, THREAD); | |
| 2143 if (!same_pm) { | |
| 2144 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string()); | |
| 2145 } | |
| 2146 } | |
| 2147 } | |
| 2148 | |
| 2149 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK); | |
| 2150 } | |
| 2151 JVM_END | |
| 2152 | |
| 2153 // bound method handles | |
| 2154 JVM_ENTRY(void, MHI_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
| 2155 jobject target_jh, int argnum)) { | |
| 2156 ResourceMark rm; // for error messages | |
| 2157 | |
| 2158 // This is the guy we are initializing: | |
| 2159 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
| 2160 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
| 2161 | |
| 2162 // Early returns out of this method leave the BMH in an unfinished state. | |
| 2163 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
| 2164 | |
| 2165 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
| 2166 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); | |
| 2167 | |
| 2168 if (!java_dyn_MethodHandle::is_instance(target())) { | |
| 2169 // Target object is a reflective method. (%%% Do we need this alternate path?) | |
| 2170 Untested("init_BMH of non-MH"); | |
| 2171 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); } | |
| 2172 int decode_flags = 0; klassOop receiver_limit_oop = NULL; | |
| 2173 methodHandle m(THREAD, | |
| 2174 MethodHandles::decode_method(target(), | |
| 2175 receiver_limit_oop, | |
| 2176 decode_flags)); | |
| 2177 KlassHandle receiver_limit(THREAD, receiver_limit_oop); | |
| 2178 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m, | |
| 2179 receiver_limit, | |
| 2180 decode_flags, | |
| 2181 CHECK); | |
| 2182 return; | |
| 2183 } | |
| 2184 | |
| 2185 // Build a BMH on top of a DMH or another BMH: | |
| 2186 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK); | |
| 2187 } | |
| 2188 JVM_END | |
| 2189 | |
| 2190 // adapter method handles | |
| 2191 JVM_ENTRY(void, MHI_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh, | |
| 2192 jobject target_jh, int argnum)) { | |
| 2193 // This is the guy we are initializing: | |
| 2194 if (mh_jh == NULL || target_jh == NULL) { | |
| 2195 THROW(vmSymbols::java_lang_InternalError()); | |
| 2196 } | |
| 2197 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); | |
| 2198 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); | |
| 2199 | |
| 2200 // Early returns out of this method leave the AMH in an unfinished state. | |
| 2201 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); | |
| 2202 | |
| 2203 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK); | |
| 2204 } | |
| 2205 JVM_END | |
| 2206 | |
| 2207 // method type forms | |
| 2208 JVM_ENTRY(void, MHI_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) { | |
| 2209 if (erased_jh == NULL) return; | |
| 2210 if (TraceMethodHandles) { | |
| 2211 tty->print("creating MethodType form "); | |
| 2212 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH! | |
| 2213 // call Object.toString() | |
| 2214 symbolOop name = vmSymbols::toString_name(), sig = vmSymbols::void_string_signature(); | |
| 2215 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh))); | |
| 2216 JavaValue result(T_OBJECT); | |
| 1142 | 2217 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig, |
| 710 | 2218 &args, CHECK); |
| 2219 Handle str(THREAD, (oop)result.get_jobject()); | |
| 2220 java_lang_String::print(str, tty); | |
| 2221 } | |
| 2222 tty->cr(); | |
| 2223 } | |
| 2224 } | |
| 2225 JVM_END | |
| 2226 | |
| 2227 // debugging and reflection | |
| 2228 JVM_ENTRY(jobject, MHI_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) { | |
| 2229 Handle mh(THREAD, JNIHandles::resolve(mh_jh)); | |
| 2230 if (!java_dyn_MethodHandle::is_instance(mh())) { | |
| 2231 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); | |
| 2232 } | |
| 2233 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL); | |
| 2234 return JNIHandles::make_local(THREAD, target); | |
| 2235 } | |
| 2236 JVM_END | |
| 2237 | |
| 2238 JVM_ENTRY(jint, MHI_getConstant(JNIEnv *env, jobject igcls, jint which)) { | |
| 2239 switch (which) { | |
| 2240 case MethodHandles::GC_JVM_PUSH_LIMIT: | |
| 2241 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF, | |
| 2242 "MethodHandlePushLimit parameter must be in valid range"); | |
| 2243 return MethodHandlePushLimit; | |
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2244 case MethodHandles::GC_JVM_STACK_MOVE_UNIT: |
| 710 | 2245 // return number of words per slot, signed according to stack direction |
| 2246 return MethodHandles::stack_move_unit(); | |
| 2247 } | |
| 2248 return 0; | |
| 2249 } | |
| 2250 JVM_END | |
| 2251 | |
| 2252 #ifndef PRODUCT | |
| 2253 #define EACH_NAMED_CON(template) \ | |
| 2254 template(MethodHandles,GC_JVM_PUSH_LIMIT) \ | |
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2255 template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) \ |
| 710 | 2256 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \ |
| 2257 template(MethodHandles,ETF_DIRECT_HANDLE) \ | |
| 2258 template(MethodHandles,ETF_METHOD_NAME) \ | |
| 2259 template(MethodHandles,ETF_REFLECT_METHOD) \ | |
| 2260 template(sun_dyn_MemberName,MN_IS_METHOD) \ | |
| 2261 template(sun_dyn_MemberName,MN_IS_CONSTRUCTOR) \ | |
| 2262 template(sun_dyn_MemberName,MN_IS_FIELD) \ | |
| 2263 template(sun_dyn_MemberName,MN_IS_TYPE) \ | |
| 2264 template(sun_dyn_MemberName,MN_SEARCH_SUPERCLASSES) \ | |
| 2265 template(sun_dyn_MemberName,MN_SEARCH_INTERFACES) \ | |
| 2266 template(sun_dyn_MemberName,VM_INDEX_UNINITIALIZED) \ | |
| 2267 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_ONLY) \ | |
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2268 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_RAW) \ |
| 710 | 2269 template(sun_dyn_AdapterMethodHandle,OP_CHECK_CAST) \ |
| 2270 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_PRIM) \ | |
| 2271 template(sun_dyn_AdapterMethodHandle,OP_REF_TO_PRIM) \ | |
| 2272 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_REF) \ | |
| 2273 template(sun_dyn_AdapterMethodHandle,OP_SWAP_ARGS) \ | |
| 2274 template(sun_dyn_AdapterMethodHandle,OP_ROT_ARGS) \ | |
| 2275 template(sun_dyn_AdapterMethodHandle,OP_DUP_ARGS) \ | |
| 2276 template(sun_dyn_AdapterMethodHandle,OP_DROP_ARGS) \ | |
| 2277 template(sun_dyn_AdapterMethodHandle,OP_COLLECT_ARGS) \ | |
| 2278 template(sun_dyn_AdapterMethodHandle,OP_SPREAD_ARGS) \ | |
| 2279 template(sun_dyn_AdapterMethodHandle,OP_FLYBY) \ | |
| 2280 template(sun_dyn_AdapterMethodHandle,OP_RICOCHET) \ | |
| 2281 template(sun_dyn_AdapterMethodHandle,CONV_OP_LIMIT) \ | |
| 2282 template(sun_dyn_AdapterMethodHandle,CONV_OP_MASK) \ | |
| 2283 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_MASK) \ | |
| 2284 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_SHIFT) \ | |
| 2285 template(sun_dyn_AdapterMethodHandle,CONV_OP_SHIFT) \ | |
| 2286 template(sun_dyn_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \ | |
| 2287 template(sun_dyn_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \ | |
| 2288 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \ | |
| 2289 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \ | |
| 2290 /*end*/ | |
| 2291 | |
| 2292 #define ONE_PLUS(scope,value) 1+ | |
| 2293 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0; | |
| 2294 #define VALUE_COMMA(scope,value) scope::value, | |
| 2295 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 }; | |
| 2296 #define STRING_NULL(scope,value) #value "\0" | |
| 2297 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) }; | |
| 2298 | |
| 2299 #undef ONE_PLUS | |
| 2300 #undef VALUE_COMMA | |
| 2301 #undef STRING_NULL | |
| 2302 #undef EACH_NAMED_CON | |
| 2303 #endif | |
| 2304 | |
| 2305 JVM_ENTRY(jint, MHI_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { | |
| 2306 #ifndef PRODUCT | |
| 2307 if (which >= 0 && which < con_value_count) { | |
| 2308 int con = con_values[which]; | |
| 2309 objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh); | |
| 2310 if (box != NULL && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { | |
| 2311 const char* str = &con_names[0]; | |
| 2312 for (int i = 0; i < which; i++) | |
| 2313 str += strlen(str) + 1; // skip name and null | |
| 2314 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); | |
| 2315 box->obj_at_put(0, name); | |
| 2316 } | |
| 2317 return con; | |
| 2318 } | |
| 2319 #endif | |
| 2320 return 0; | |
| 2321 } | |
| 2322 JVM_END | |
| 2323 | |
| 2324 // void init(MemberName self, AccessibleObject ref) | |
| 2325 JVM_ENTRY(void, MHI_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { | |
| 2326 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
| 2327 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
| 2328 oop target_oop = JNIHandles::resolve_non_null(target_jh); | |
| 2329 MethodHandles::init_MemberName(mname(), target_oop); | |
| 2330 } | |
| 2331 JVM_END | |
| 2332 | |
| 2333 // void expand(MemberName self) | |
| 2334 JVM_ENTRY(void, MHI_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { | |
| 2335 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
| 2336 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
| 2337 MethodHandles::expand_MemberName(mname, 0, CHECK); | |
| 2338 } | |
| 2339 JVM_END | |
| 2340 | |
| 2341 // void resolve(MemberName self, Class<?> caller) | |
| 2342 JVM_ENTRY(void, MHI_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { | |
| 2343 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } | |
| 2344 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); | |
| 2345 // %%% take caller into account! | |
| 2346 MethodHandles::resolve_MemberName(mname, CHECK); | |
| 2347 } | |
| 2348 JVM_END | |
| 2349 | |
| 2350 // static native int getMembers(Class<?> defc, String matchName, String matchSig, | |
| 2351 // int matchFlags, Class<?> caller, int skip, MemberName[] results); | |
| 2352 JVM_ENTRY(jint, MHI_getMembers(JNIEnv *env, jobject igcls, | |
| 2353 jclass clazz_jh, jstring name_jh, jstring sig_jh, | |
| 2354 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { | |
| 2355 if (clazz_jh == NULL || results_jh == NULL) return -1; | |
| 2356 klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)); | |
| 2357 | |
| 2358 objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh); | |
| 2359 if (results == NULL || !results->is_objArray()) return -1; | |
| 2360 | |
| 2361 symbolOop name = NULL, sig = NULL; | |
| 2362 if (name_jh != NULL) { | |
| 2363 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); | |
| 2364 if (name == NULL) return 0; // a match is not possible | |
| 2365 } | |
| 2366 if (sig_jh != NULL) { | |
| 2367 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); | |
| 2368 if (sig == NULL) return 0; // a match is not possible | |
| 2369 } | |
| 2370 | |
| 2371 klassOop caller = NULL; | |
| 2372 if (caller_jh != NULL) { | |
| 2373 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); | |
| 2374 if (!java_lang_Class::is_instance(caller_oop)) return -1; | |
| 2375 caller = java_lang_Class::as_klassOop(caller_oop); | |
| 2376 } | |
| 2377 | |
| 2378 if (name != NULL && sig != NULL && results != NULL) { | |
| 2379 // try a direct resolve | |
| 2380 // %%% TO DO | |
| 2381 } | |
| 2382 | |
| 2383 int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags, | |
| 2384 caller, skip, results); | |
| 2385 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks | |
| 2386 return res; | |
| 2387 } | |
| 2388 JVM_END | |
| 2389 | |
| 2390 | |
|
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2391 JVM_ENTRY(void, MH_linkCallSite(JNIEnv *env, jobject igcls, jobject site_jh, jobject target_jh)) { |
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2392 // No special action required, yet. |
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2393 oop site_oop = JNIHandles::resolve(site_jh); |
|
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2394 if (site_oop == NULL || site_oop->klass() != SystemDictionary::CallSite_klass()) |
|
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2395 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "call site"); |
|
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2396 java_dyn_CallSite::set_target(site_oop, JNIHandles::resolve(target_jh)); |
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2397 } |
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2398 JVM_END |
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2399 |
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2400 |
| 710 | 2401 /// JVM_RegisterMethodHandleMethods |
| 2402 | |
| 2403 #define ADR "J" | |
| 2404 | |
| 2405 #define LANG "Ljava/lang/" | |
| 2406 #define JDYN "Ljava/dyn/" | |
| 2407 #define IDYN "Lsun/dyn/" | |
| 2408 | |
| 2409 #define OBJ LANG"Object;" | |
| 2410 #define CLS LANG"Class;" | |
| 2411 #define STRG LANG"String;" | |
|
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2412 #define CST JDYN"CallSite;" |
| 710 | 2413 #define MT JDYN"MethodType;" |
| 2414 #define MH JDYN"MethodHandle;" | |
| 2415 #define MHI IDYN"MethodHandleImpl;" | |
| 2416 #define MEM IDYN"MemberName;" | |
| 2417 #define AMH IDYN"AdapterMethodHandle;" | |
| 2418 #define BMH IDYN"BoundMethodHandle;" | |
| 2419 #define DMH IDYN"DirectMethodHandle;" | |
| 2420 | |
| 2421 #define CC (char*) /*cast a literal from (const char*)*/ | |
| 2422 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) | |
| 2423 | |
| 2424 // These are the native methods on sun.dyn.MethodHandleNatives. | |
| 2425 static JNINativeMethod methods[] = { | |
| 2426 // void init(MemberName self, AccessibleObject ref) | |
| 2427 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHI_init_AMH)}, | |
| 2428 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHI_init_BMH)}, | |
| 2429 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHI_init_DMH)}, | |
| 2430 {CC"init", CC"("MT")V", FN_PTR(MHI_init_MT)}, | |
| 2431 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHI_init_Mem)}, | |
| 2432 {CC"expand", CC"("MEM")V", FN_PTR(MHI_expand_Mem)}, | |
| 2433 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHI_resolve_Mem)}, | |
| 2434 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHI_getTarget)}, | |
| 2435 {CC"getConstant", CC"(I)I", FN_PTR(MHI_getConstant)}, | |
| 2436 // static native int getNamedCon(int which, Object[] name) | |
| 2437 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHI_getNamedCon)}, | |
| 2438 // static native int getMembers(Class<?> defc, String matchName, String matchSig, | |
| 2439 // int matchFlags, Class<?> caller, int skip, MemberName[] results); | |
| 2440 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHI_getMembers)} | |
| 2441 }; | |
| 2442 | |
|
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2443 // More entry points specifically for EnableInvokeDynamic. |
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2444 static JNINativeMethod methods2[] = { |
|
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2445 {CC"linkCallSite", CC"("CST MH")V", FN_PTR(MH_linkCallSite)} |
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2446 }; |
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2447 |
| 710 | 2448 |
| 2449 // This one function is exported, used by NativeLookup. | |
| 2450 | |
| 2451 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { | |
| 2452 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK"); | |
| 2453 | |
|
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2454 // note: this explicit warning-producing stuff will be replaced by auto-detection of the JSR 292 classes |
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2455 |
| 710 | 2456 if (!EnableMethodHandles) { |
|
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2457 warning("JSR 292 method handles are disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableMethodHandles to enable."); |
| 710 | 2458 return; // bind nothing |
| 2459 } | |
| 2460 | |
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2461 bool enable_MH = true; |
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2462 |
| 710 | 2463 { |
| 2464 ThreadToNativeFromVM ttnfv(thread); | |
| 2465 | |
| 2466 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod)); | |
| 2467 if (env->ExceptionOccurred()) { | |
| 2468 MethodHandles::set_enabled(false); | |
| 2469 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); | |
|
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2470 enable_MH = false; |
| 710 | 2471 env->ExceptionClear(); |
| 2472 } | |
| 2473 } | |
|
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2474 |
|
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2475 if (enable_MH) { |
|
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2476 KlassHandle MHI_klass = SystemDictionaryHandles::MethodHandleImpl_klass(); |
|
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2477 if (MHI_klass.not_null()) { |
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2478 symbolHandle raiseException_name = oopFactory::new_symbol_handle("raiseException", CHECK); |
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2479 symbolHandle raiseException_sig = oopFactory::new_symbol_handle("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK); |
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2480 methodOop raiseException_method = instanceKlass::cast(MHI_klass->as_klassOop()) |
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2481 ->find_method(raiseException_name(), raiseException_sig()); |
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2482 if (raiseException_method != NULL && raiseException_method->is_static()) { |
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2483 MethodHandles::set_raise_exception_method(raiseException_method); |
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2484 } else { |
|
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2485 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); |
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2486 enable_MH = false; |
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2487 } |
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2488 } |
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2489 } |
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2490 |
|
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2491 if (enable_MH) { |
|
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2492 MethodHandles::set_enabled(true); |
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2493 } |
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2494 |
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2495 if (!EnableInvokeDynamic) { |
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2496 warning("JSR 292 invokedynamic is disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableInvokeDynamic to enable."); |
|
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2497 return; // bind nothing |
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2498 } |
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2499 |
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2500 { |
|
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2501 ThreadToNativeFromVM ttnfv(thread); |
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2502 |
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2503 int status = env->RegisterNatives(MHN_class, methods2, sizeof(methods2)/sizeof(JNINativeMethod)); |
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2504 if (env->ExceptionOccurred()) { |
|
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2505 MethodHandles::set_enabled(false); |
|
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2506 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); |
|
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2507 env->ExceptionClear(); |
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2508 } else { |
|
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2509 MethodHandles::set_enabled(true); |
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2510 } |
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2511 } |
| 710 | 2512 } |
| 2513 JVM_END |